The present disclosure, structural members having an impact resistance, and to a vehicle body structure and the bumper member using the same.
BACKGROUND
[0002]
　Structural member in cross-section has a hat member hat shape, a tubular portion formed by the closing plate to be bonded to the hat member is used in a variety of applications. Applications include for example, vehicles, buildings, and a structural member of the large containers. Particularly structural members used in automobiles, impact resistance is required.
[0003]
　For example, International Publication No. 2005/058624 (Patent Document 1), for the impact, the metal tube which is mounted in the structure of both ends supported on the vehicle body of an automobile is disclosed. The metal tube has a bend in full or partially. Is arranged to the outer peripheral side of the bent portion is substantially matches the direction of impact applied to the vehicle body. The metal pipe, compared with a reinforcing member using a straight tube, having excellent impact resistance for the body reinforcement.
CITATION
Patent Document
[0004]
Patent Document 1: WO 2005/058624
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　Structural member having a tubular portion, bent and shock exceeding yield strength, bending portion protrudes. When thinning the structural member for weight reduction, the protruding degree tends to be large when broken by an impact. For example, structural members used in automobiles, it is preferable degree of projection inward when subjected to impact from the outside of the vehicle is small. Thus, in the structural member, the degree to which the portion deformed by the impact caused by the collision protruding, it may be preferable smaller.
[0006]
　To ensure strength of the structural member, there is a case where the reinforcing member is disposed on a portion of the structural member. Thus, in the structural member where the reinforcing member is disposed, the configuration for a smaller degree of projection portion deformed by the impact is not taught by the prior art.
[0007]
　Accordingly, the present application, the structural member reinforcement member is disposed, discloses a smaller possible technique degree of projection upon deformation due to impact.
Means for Solving the Problems
[0008]
　Structural member according to one aspect of the present disclosure includes a closed cross-section structural member, and a reinforcing member attached to the closed section structural member. The closed section structural member has at least one closing plate, and a hat member. The hat member includes a top wall, and two first ridgeline on the both ends of the top wall, and two flanges, each being joined to the closing plate, two at the ends of the two flanges has a second ridge, the two side walls respectively located between said two first edges and said two second edges. Height in the direction perpendicular to said top surface of said two side walls are each H1, H2. Each of said two side walls has a high strength portion and a low strength portion. Yield strength of the high strength portion is not less than 500 MPa. The low strength portion is disposed adjacent at the high intensity part and the extending direction of the first ridgeline. Yield strength of the low strength portion is 60-85% of the yield strength of the high strength portion. The reinforcing member is provided adjacent to at least a portion of said top wall of said hat member. In the extending direction of the first ridge line, both ends of the reinforcing member is disposed at a position overlapping with the high-strength portion of the side wall. Wherein at least one of the 1/3 to 3/2-fold spaced-apart regions of the H1 in the direction away from the reinforcing member in the extending direction of the first ridge from the end of the two ends of the reinforcing member and the H2 1 / 3 wherein the 1-3 / 2 times the high intensity portion in overlapping range of the spaced-apart regions boundary of the low intensity portion is disposed.
The invention's effect
[0009]
　According to the present disclosure, the structural member reinforcement member is disposed, the degree of projection during deformation due to impact can be further reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010]
[Figure 1A] at both ends is a diagram illustrating a configuration example of the supported structural member.
It is a diagram illustrating a deformation behavior example of the structure member shown in FIG. 1B] FIG 1A.
It is a perspective view showing the configuration of the structural member in FIG 2A] present embodiment.
The structural member shown in FIG. 2B] FIG. 2A is a front view as viewed from the y direction.
The structural member shown in FIG. 2C] FIG 2A is a side view from the x-direction.
FIG 2D] FIG 2D is a side view illustrating a modification of the arrangement of the high-strength portion and a low strength portion.
3 is a diagram for explaining the deformation behavior of the structural members having a uniform intensity distribution.
4 is a diagram for explaining the deformation behavior of the structural member having a low strength portion sandwiching the high-strength portion.
The structural member shown in FIG. 5A] FIG. 2A is a top view showing the configuration seen from the z-direction.
It is a diagram illustrating a modification of the arrangement of the high-strength portion and a low strength portion of the structural member shown in FIG. 5B] FIG 2A.
It is a diagram illustrating a modification of the arrangement of the low-strength portion of the structural member shown in FIG. 6A] FIG 2A.
It is a diagram illustrating a modification of the arrangement of the low-strength portion of the structural member shown in FIG. 6B] FIG 2A.
It is a diagram illustrating a modification of the arrangement of the low-strength portion of the structural member shown in FIG. 6C] FIG 2A.
It is a sectional view showing a modified example of the cross-sectional shape of FIG. 7A] structural member.
It is a cross-sectional view showing another modified example of the cross-sectional shape of FIG. 7B] structural member.
8 is a diagram for explaining a height direction of the side wall.
High-strength portion when [9] is different height of the two side walls, a view for explaining an arrangement of the low-strength portion and the reinforcing member.
It is a sectional view showing a modified example of FIG. 10A] structural member.
It is a cross-sectional view showing another modified example of FIG. 10B] structural member.
It is a sectional view showing still another modification of FIG 10C] structural member.
Is a top view of the structural member as seen from the z direction shown in FIG. 10D] FIG 10B.
Is a side view showing an example of FIG. 11A] curved structural member.
Is a side view showing an example of FIG. 11B] curved structural member.
Is a side view showing an example of FIG. 11C] curved structural member.
Is a side view showing an example of FIG. 11D] curved structural member.
It is a view showing a modification of the arrangement of FIG. 12A] reinforcing member.
It is a view showing a modification of the arrangement of FIG. 12B] reinforcing member.
Is a view showing a modification of the arrangement of FIG. 12C] reinforcing member.
Is a view showing a modification of the arrangement of FIG. 12D] reinforcing member.
It is a view showing a modification of the arrangement of FIG. 12E] reinforcing member.
It is a view showing a modification of the arrangement of FIG. 12F] reinforcing member.
It is a view showing a modification of the arrangement of FIG. 12G] reinforcing member.
Is a view showing a modification of the arrangement of FIG. 12H] reinforcing member.
It is a view showing a modification of the arrangement of FIG. 12I] reinforcing member.
It is a view showing a modification of the arrangement of FIG. 12 J] reinforcing member.
It is a view showing a modification of the arrangement of FIG. 12K] reinforcing member.
13 is a diagram showing an example of a structure member disposed on the vehicle.
14 is a diagram showing a configuration example of a bumper reinforcement.
[15] rocker is a diagram illustrating a configuration example of a B-pillar and roof rail.
Is a diagram showing an example of the distribution of yield strength of the portion of the structural member including a boundary of FIG. 16 lower strength portion and the high strength portion.
It is a diagram showing a configuration of an analysis model in FIG. 17A] simulation.
The model of FIG. 17B] FIG. 17A is a diagram showing the configuration seen from the y-direction.
Is an enlarged view of a region S shown by a dotted line in FIG. 17C] FIG 17A.
It is a diagram showing a configuration of an analysis model in FIG. 18 simulation.
Is a diagram showing FIG. 19 simulation result of deformation of the structural member.
[Figure 20] in the case of changing the intensity ratio of the low-strength portion and the high strength portion enter the impact load is a graph showing the amount of deformation due to bending deformation.
DESCRIPTION OF THE INVENTION
[0011]
　Inventor cross section member hat-shaped (hereinafter, referred to as the hat member), a closing plate is joined to the hat member, in the tubular portion or closed section structural member is formed, the structural member disposed reinforcing member It was examined behavior against impact. 1A is a closed section structural member 55 formed in a hat member and the closing plate is a diagram showing an example of a structural member 5 comprising a reinforcing member 45. In Figure 1A, both longitudinal end portions of the closed cross member 55 is supported on the pedestal 60. Longitudinal central reinforcing member 45 of the closed cross member 55 is disposed. Thus, the structural member 5, in a state in which both ends in the longitudinal direction is supported, the structure (e.g., a vehicle, a building or container, etc.) often constitutes a part of.
[0012]
　Accordingly, the inventors in the longitudinal center of the structural member having both ends supported, (in the example of FIG. 1A, the direction of the arrow y1) direction perpendicular to the longitudinal direction deformation behavior of the structural members when the added impact They were examined. Figure 1B is a diagram showing a deformed state of the case plus the direction of impact of the arrows y1 to the structural member 5 shown in FIG. 1A. In the example shown in FIG. 1B, in the closed cross section member 55, at both ends near the RT of the reinforcing member 45, bending occurs. Thus, if you place the reinforcing member 45 in the closed section structural member 55, easily broken at the time of the reinforcing member 45. By bending in the vicinity of both ends of the reinforcing member 45, it was found that there is a tendency that protruding degree by deformation in the direction of impact of the structural member 5 is increased.
[0013]
　Inventors examined the structure for suppressing the breakage of the end portions of the reinforcing member. Among the study came up with varying the intensity distribution of the closed section structural member 55. Therefore, the inventors, by varying the intensity distribution of the structural member, further consider suppress deformation bending in the vicinity of the reinforcing member.
[0014]
　Inventors, for material strength and intensity distribution of the structural member, a result of intensive studies, the side walls of the structural member, and a high-strength portion of the yield strength of more than 500 MPa, the strength is low low-strength portion than the high-strength portion in the longitudinal direction It was conceived in the configuration to place side by side. In this configuration, place the reinforcing member at a position corresponding to the high-strength portion of the side wall, the distance between the reinforcing member and the low strength portion by appropriately setting, that is suppressed deformation bending in the vicinity of an end portion of the reinforcing member It was heading. Based on this finding, and conceived the structural member of the following embodiments.
[0015]
　(Structure 1)
　structural member of the structure 1 in an embodiment of the present invention comprises a closed section structural member, and a reinforcing member attached to the closed section structural member. The closed section structural member has at least one closing plate, and a hat member. The hat member includes a top wall, and two first ridgeline on the both ends of the top wall, and two flanges, each being joined to the closing plate, two at the ends of the two flanges has a second ridge, the two side walls respectively located between said two first edges and said two second edges. Height in the direction perpendicular to said top surface of said two side walls are each H1, H2. Each of said two side walls has a high strength portion and a low strength portion. Yield strength of the high strength portion is not less than 500 MPa. The low strength portion is disposed adjacent at the high intensity part and the extending direction of the first ridgeline. Yield strength of the low strength portion is 60-85% of the yield strength of the high strength portion. The reinforcing member is provided adjacent to at least a portion of said top wall of said hat member. In the extending direction of the first ridge line, both ends of the reinforcing member is disposed at a position overlapping with the high-strength portion of the side wall. Wherein at least one of the 1/3 to 3/2-fold spaced-apart regions of the H1 in the direction away from the reinforcing member in the extending direction of the first ridge from the end of the two ends of the reinforcing member and the H2 1 / 3 wherein the 1-3 / 2 times the high intensity portion in overlapping range of the spaced-apart regions boundary of the low intensity portion is disposed.
[0016]
　In the above structure 1, the length H1, H2 of the side wall in a direction perpendicular to the top wall, the distance between the first ridge and the second ridge line of each side wall in a direction perpendicular to the top wall It is defined as. Incidentally, the two flanges, in a cross section in a plane perpendicular to the second ridge, extending in a direction away from each other from the respective second ridge. Further, the direction perpendicular to the top wall, the direction perpendicular to the surface of the top wall, i.e., a direction perpendicular to the top surface. In structure 1, a direction perpendicular to the top wall, is defined as the height direction of the side wall.
[0017]
　In the above structure 1, in each of the two side walls of the hat member, high-strength portion and a low strength portion is arranged in the extending direction of the first ridgeline. Further, in the extending direction of the first ridge line, both ends of the reinforcing member overlaps the high-strength portion of the side wall. Here, none of the high-strength portion of the two side walls is assumed to overlap with the ends of the reinforcing member. Thus, the reinforcing member is disposed at a position corresponding to the high-strength portion of the side wall. Further, in the extending direction of the first ridge line, from at least one of the ends of the reinforcing member, (H1) / 3 ~ 3 (H1) / 2 and (H2) / 3 ~ 3 (H2) / 2 of the high ranges boundary strength portion and a low strength portion is disposed. Thus, the reinforcing member is disposed portion of the structural member, if the impact is applied in the direction perpendicular to the top wall from the top wall side, the deformation of the side walls in at least one vicinity of the ends of the reinforcing member, low early it can be distributed to the strength portion. As a result, the degree of bending of the impact direction in the vicinity of the reinforcing member is suppressed. That is, structural members of the structure 1 is smaller degree of deformation with respect to an impact applied from the top surface of the hat member.
[0018]
　(Structure 2)
　structural members of the structure 2 in an embodiment of the present invention comprises a closed section structural member, and a reinforcing member attached to the closed section structural member. The closed section structural member has at least one closing plate, and a hat member. The hat member includes a top wall, and two first ridgeline on the both ends of the top wall, and two flanges, each being joined to the closing plate, two at the ends of the two flanges has a second ridge, the two side walls respectively located between said two first edges and said two second edges. Height in the direction perpendicular to the closing plates of the two side walls are each H1, H2. Each of said two side walls has a high strength portion and a low strength portion. Yield strength of the high strength portion is not less than 500 MPa. The low strength portion is disposed adjacent at the high intensity part and the extending direction of the first ridgeline. Yield strength of the low strength portion is 60-85% of the yield strength of the high strength portion. The reinforcement member, at least a portion of the closing plate or is provided adjacent to at least a portion of the two side walls of the hat member. In the extending direction of the first ridge line, both ends of the reinforcing member is disposed at a position overlapping with the high-strength portion of the side wall. Wherein at least one of the 1/3 to 3/2-fold spaced-apart regions of the H1 in the direction away from the reinforcing member in the extending direction of the first ridge from the end of the two ends of the reinforcing member and the H2 1 / 3 wherein the 1-3 / 2 times the high intensity portion in overlapping range of the spaced-apart regions boundary of the low intensity portion is disposed.
[0019]
　Defined above structure 2, the length H1, H2 of the side wall in a direction perpendicular to the closing plate, the first ridge line of each side wall in a direction perpendicular to the closing plate and the distance between the second ridge to. Incidentally, the two flanges, in a cross section in a plane perpendicular to the second ridge, extending in a direction away from each other from the respective second ridge. Further, the direction perpendicular to the closing plate is perpendicular to the surface of the closing plate. In structure 2, a direction perpendicular to the closing plate, is defined as the height direction of the side wall.
[0020]
　In structure 2, in each of the two side walls of the hat member, high-strength portion and a low strength portion is arranged in the extending direction of the first ridgeline. Further, in the extending direction of the first ridge line, both ends of the reinforcing member overlaps the high-strength portion of the side wall. Further, in the extending direction of the first ridge line, from at least one of the ends of the reinforcing member, H1 / 3 ~ 3H1 / 2 and H2 / 3 ~ high-strength portion and the boundary of the low intensity portion in the range of 3H2 / 2 is placed It is. Thus, the reinforcing member disposed portion of the structural member, if the impact is applied in a direction perpendicular from the closing plate side claw jig plate, the deformation of the side walls in at least one vicinity of the ends of the reinforcing member, early it can be distributed to the low strength portion. As a result, the degree of bending of the impact direction in the vicinity of the reinforcing member is suppressed. That is, structural members of the structure 2 has a smaller degree of deformation with respect to an impact applied from the closing plate.
[0021]
　In the above structure 2, the distance of the reinforcing member, the form that is adjacent to at least a portion of the closing plate, the reinforcing member is at least another part in contact form of closing plates, and at least a portion of the reinforcing member and the closing plate but also it includes or less height form of a curved portion between the flange and the side wall. To form a reinforcing member that is adjacent to at least a portion of the two side walls, at least another part contact configuration of the reinforcement member has two side walls, the distance between at least a portion of the reinforcing member and two side walls, the flanges and also including equal to or less than the height form the curved portion between the side walls. Reinforcing member is disposed portion is more degree of deformation with respect to an impact applied from the closing plate is reduced. Note that in the structure 2, the height of the curved portion, a height in a direction perpendicular to the closing plate.
[0022]
　The reinforcing member in the above structure 2, for example, may be provided from at least a portion of the two side walls adjacent to the region up to the flange via the second ridge. The reinforcing member, in two side walls, may be adjacent the second ridge in the area of ​​the range of the first distance. Here, the first distance is a radius of curvature of the curved portion between the flange and the side wall.
[0023]
　The reinforcing members in the structure 2 may be adjacent to both the closing plate and the side wall. As an example, it may have a recess closing plate is recessed to the inside of the closed section structural member. In this case, the reinforcing member, inside the closed cross section member may be provided so as to adjacent to both the recess and two side walls of the closing plate. In this configuration, the depth in the direction perpendicular to the closing plate of the recess is 2/5 ie 40% shorter of the length between the first ridge and the second ridge of the two side walls below.
[0024]
　(Structure 3)
　structural members of the structure 3 in an embodiment of the present invention comprises a closed section structural member, and a reinforcing member attached to the closed section structural member. The closed section structural member has at least one closing plate, and a channel member. Said channel member, said a top wall, and two first ridgeline on the both ends of the top wall, and two junctions each of which is joined to the closing plate, said two first edges and between the two junctions, having two side walls each located. Height in the direction perpendicular to said top surface of said two side walls are each H1, H2. Each of said two side walls has a high strength portion and a low strength portion. Yield strength of the high strength portion is not less than 500 MPa. The low strength portion is disposed adjacent at the high intensity part and the extending direction of the first ridgeline. Yield strength of the low strength portion is 60-85% of the yield strength of the high strength portion. The reinforcing member is provided adjacent to at least a portion of said top wall of said hat member. In the extending direction of the first ridge line, both ends of the reinforcing member is disposed at a position overlapping with the high-strength portion of the side wall. The 1/3 to 3/2-fold spaced-apart regions of the flows from at least one end of both ends of the reinforcing member in a direction away from the reinforcing member in the extending direction of the first ridge line H1 and the H2 1 / 3 wherein the 1-3 / 2 times the high intensity portion in overlapping range of the spaced-apart regions boundary of the low intensity portion is disposed.
[0025]
　In the above structure 3, the length H1, H2 of the side wall in a direction perpendicular to the top surface section, said first ridge line of each side wall in a direction perpendicular to said top wall, said joint portions of said first ridge line It is defined as the distance between the bonding line (imaginary line) connecting to the extending direction. In structure 3, the direction perpendicular to the top wall, is defined as the height direction of the side wall.
[0026]
　Structural members of the structure 3, point flange no different from the structure 1. That is, the hat material structure 1, corresponding to the groove-type material of the structure 3. Structural members of the structure 3, as with the structural member of the structure 1, a small degree of deformation with respect to an impact applied from the top surface of the channel material.
[0027]
　(Structure 4)
　structural members of the structure 4 in the embodiment of the present invention comprises a closed section structural member, and a reinforcing member attached to the closed section structural member. The closed section structural member has at least one closing plate, and a channel member. The channel member has one top wall, and two first ridgeline on the both ends of the top wall, a flange joined to the closing plate, one second at the end of the flange located between the ridge line, a first side wall located between said first ridge and said second ridge line, and a joint portion which is joined to the closing plate, said first ridge and said junction and a second sidewall. Wherein the height in the direction perpendicular to the top surface of the first side wall is H1. Wherein the height in the direction perpendicular to the top surface of the second side wall is H2. Each of said first sidewall and said second sidewall has a high strength portion and a low strength portion. Yield strength of the high strength portion is not less than 500 MPa. The low strength portion is disposed adjacent at the high intensity part and the extending direction of the first ridgeline. Yield strength of the low strength portion is 60-85% of the yield strength of the high strength portion. The reinforcing member is provided adjacent to at least a portion of said top wall of said hat member. In the extending direction of the first ridge line, both ends of the reinforcing member is disposed at a position overlapping with the high-intensity portion of the first sidewall and the second sidewall. Wherein the ends of at least one of the 1/3 to 3/2-fold spaced-apart regions of the H1 in the direction away from the reinforcing member in the extending direction of the first ridge from the end of the reinforcing member and the H2 1 / wherein said high-strength portion in overlapping range of 3 to 3/2-fold spaced area boundary of the low intensity portion is disposed.
[0028]
　In the above structure 4, the length H1 of the sidewalls, rub defined as the distance between the first ridge and the second ridge line of the first side wall in a direction perpendicular to said top surface. The length of the side wall H2 is the second joining lines connecting the junction of the side wall in the extending direction of the first ridge and (phantom), the direction perpendicular to said top surface of said first ridgeline It is defined as the distance in. In structure 3, the direction perpendicular to the top wall, is defined as the height direction of the side wall.
[0029]
　Structural members of the structure 4 is a modification of the structure 3. Structure 3 with respect to the flange is not in the both ends of the channel member, the structure 4 is at one end of both ends of the channel member has a flange, the flange is not in the other end. Structural members of the structure 4, similarly to the structure 1 and structure 3, a small degree of deformation with respect to an impact applied from the top surface of the channel material.
[0030]
　In the above structure 1, 3 and 4, the reinforcing member is in the form adjacent at least a portion of the top surface portion, other reinforcing member at least partially in contact form of the top surface portion, and at least a portion of the reinforcing member and the top wall distance is also include or less height form of a curved portion between the said top wall side walls. Reinforcing member is disposed portion is more degree of deformation is small with respect to an impact applied from the top wall. In Structure 1, 3 and 4, the height of the curved portion, the height of the curved portion in a direction perpendicular to the top wall.
[0031]
　In the above structure 1, 3 and 4, the reinforcing member may be adjacent to both the top wall and the side wall. As an example, it may have a recess top wall is recessed to the inside of the closed section structural member. In this case, the reinforcing member, inside the closed cross section member may be provided so as to adjacent to the recess and two side walls of the top wall. In this configuration, the depth in the direction perpendicular to the top wall of the recess of the top wall is 2/5 ie 40% shorter of the length between the first ridge and the second ridge of the two side walls below to.
[0032]
　(Structure 5)
　Next structure 5 will be described. In any of the above structures 1-4, the dimensions of the low-strength portion in the extending direction of the first ridge, and over 3/5 times the H1, is preferably 3/5 times or more of H2. This further makes it possible to further suppress the deformation degree of the shock due to the structural member to high-strength portion.
[0033]
　(Structure 6)
　Next structure 6 will be described. In any of the above structures 1-5, in the extending direction of the first edge line, the low-strength portion is preferably disposed on both sides of the high-strength portion. If an impact is applied to the structural member, the deformation of the side walls at the ends of the reinforcing member can be dispersed to the early low-strength portion.
[0034]
　In the above structure 6, wherein the reinforcing member includes a center of the low-strength part arranged on both sides of the high-strength portion in each of the two side walls, it is disposed at a position overlapping in the extending direction of the first ridge line good.
[0035]
　(Structure 7)
　Next structure 7 will be described. In any of the above structures 1-6, wherein the reinforcing member is preferably disposed at the center in the extending direction of the first edge line of the closed cross-section structural member. The first extending direction of the central ridge of the closed section structural member is moment due to the impact tends to increase. Like the structure 7, the high-strength portion is disposed at the center in the extending direction of the first edge line, by arranging the low intensity on both sides, it is possible to suppress efficiently the deformation of the structural member due to impact.
[0036]
　(Structure 8)
　will be described the structure 8. In any of the above structures 1, 3 and 4, between the opposite side of the other end to one end of said first ridge line side of the side wall and the first edge line, the other end from the one end of the side wall toward a region between the to 1/4 position of the length between said one end and said other end of said side wall, said there may be an end portion of the one end side of the low-strength portion. The length in the direction toward the other end from the one end of the low-strength portion is a length of 1/5 or more between said one end and said other end of said side wall. In this case, the yield strength of the side wall between said one end of the end portion and the side wall of the one end side of the low-strength portion is higher than the above and the low-strength portion 500 MPa.
[0037]
　According to the structure 8, it is possible to suppress efficiently the deformation of the structural member against the impact of the top wall.
[0038]
　In the above structure 8, if the side wall is positioned between the first ridge and the second ridge, the first ridge line becomes one end of the side wall, the second ridge is the other end of the side wall. Therefore, the length between one end and the other end of the side wall, the first ridge and the distance between the second ridge (distance). Sidewall when located between the junction and the first ridge, the first ridge on the other hand becomes end joint line connecting the joint to the extending direction of the first ridge line is the other end. Therefore, the length between one end and the other end of the side wall is defined by the distance between the first edge line and the bonding line (distance).
[0039]
　(Structure 9)
　Next, the structure 9 will be described. In the above structure 2, between the other end of the one end and the first edge line side opposite the first ridgeline side of the side wall, toward the other end from the one end of said side wall, said side walls of the in the region between the contrast and the end to 1/4 position of the length between the other end, the there may be an end portion of the one end side of the low-strength portion. The length in the direction toward the other end from the one end of the low-strength portion may be less than 1/5 of the length between said one end and said other end of said side wall. In this case, the yield strength of the side wall between said one end of the end portion and the side wall of the one end side of the low-strength portion is higher than the above and the low-strength portion 500 MPa.
[0040]
　According to the structure 9, it is possible to suppress efficiently the deformation of the structural member against the impact of the closing plate.
[0041]
　In the above structure 9, when the side wall is positioned between the first ridge and the second ridge, the second ridge becomes one end of the side wall, the first ridge line is the other end of the side wall. Therefore, the length between one end and the other end of the side wall, the first ridge and the distance between the second ridge (distance). Sidewall when located between the first edge line and the junction, the junction becomes the first extending direction connecting it joining line is one end of the ridge, the first ridge line is the other end. Therefore, the length between one end and the other end of the side wall is defined as the distance between the first ridge and the bonding line (distance).
[0042]
　(Structure 10)
　and then the structure 10 will be described. In any of the above structures 1, 3, 4, and 8, wherein the structural member is preferably curved so as to be convex toward the top surface side. Thus, the structural member hardly deformed by impact to the top wall.
[0043]
　(Structure 11)
　and then the structure 11 will be described. In the above structure 2, or 10, wherein the structural member is preferably curved so as to be convex toward the closing plate side. Thus, the structural member is less likely to be deformed by impact to the closing plate.
[0044]
　(Structure 12)
　and then the structure 12 will be described. In any of the above structures 1 to 11, in the cross section of the plane perpendicular to the extending direction of the first ridge, the virtual line segment the closing plate connecting part which is joined to the hat member and the groove-side member at least in part, it may be a certain aspect between the closing plate and the top wall. In structure 12, wherein the closing plate comprises an intermediate portion between said hat member or the portion overlapped a pair of superimposed and channel member and the pair of overlapping portions. The intermediate portion is formed to protrude in a direction away from said hat member or channel member with respect to said overlapping portions.
[0045]
　(Structure 13)
　and then the structure 13 will be described. Structure 13 is a vehicle body structure comprising any of the structural members of the structure 1-12. In structure 13, the reinforcing member is a center pillar, the closed section structural member is a rocker or a roof rail. Bodywork structure 13 is also an example of embodiment of the present invention.
[0046]
　(Structure 14)
　and then the structure 14 will be described. Structure 14 is a bumper reinforcement which is formed in one of the structural members of the structure 1-12. Bumper reinforcement structure 14 is also an example of embodiment of the present invention.
[0047]
　Any structural members of the structure 1 to 12, for example, other members (e.g., members constituting the vehicle body) may be attached to. In this case, the top wall or the closing plate is a two coupling portions provided in two places spaced in the extending direction of the first ridge, includes two connection portion that is connected to another member But good. In this case, the distance in the extending direction of the first ridge line between the two connecting portion may be 6 times 6 times and H2 of H1. In this case, high-strength portion, said to be located centrally between the two coupling parts preferred. In this case, the reinforcing member is also disposed centrally between the two coupling portions. Thus, it is possible to suppress efficiently the deformation of the structural member due to impact. Specifically, when the length between two connecting portions, in the case of more than 6 times 6 times and H2 of the side wall height H1, an impact is applied to the center of the structural member of one of the connecting portions most the moment load is high has been found by the inventors to. According to the above structure, a portion of the load moment increases reinforced by high-strength portion and the reinforcing member, it is possible to suppress the deformation degree against impact near the reinforcing member.
[0048]
　Furthermore, structural members are often used in a state where both ends of the closed section structural member is supported on the other member. Therefore, the length in the first extending direction of the ridge line of the closed cross section member, and 6 times or more and 6 times or more H2 of the side wall height H1, the extending direction of the first ridge of the closed cross section member center of, it is preferable to arrange the high-strength portion and the reinforcing member. Thus, a portion of the load moment increases reinforced by high-strength portion and the reinforcing member, it is possible to suppress the deformation degree against impact near the reinforcing member.
[0049]
　In any of the structural members of the structure 1 to 12, 1/3 of the from at least one end of both ends of the reinforcing member in a direction away from the reinforcing member in the extending direction of the first ridge line H1 preferably the high strength portion and a boundary of the low-strength portion in the overlapping range between ~ 1 times spaced region and the H2 of 1/3 to 1 times spaced-apart regions are located. Thus, the degree of bending of the impact direction in the vicinity of the reinforcing member is further suppressed.
[0050]
　In the above structures 1 to 12, the reinforcing member is outside or inside the closed cross section member, or may be located in both. At least both end portions of the entire reinforcing member, in the extending direction of the first ridge, it is sufficient overlap the high-strength portion. For example, the sidewall of the position overlapping in the extending direction of the portion other than the both ends of the first ridge of the reinforcing member, the yield strength than the high strength portion may be a lower portion. Incidentally, the reinforcing member is fixed to the closed cross-section structural member. For example, welding (including spot welding, laser welding other welding), adhesive, or by brazing or the like, the reinforcing member is fixed to the closed cross-section structural member.
[0051]
　Structural members of the structure 1, 3 and 4, a small degree of deformation with respect to impact applied to the top surface of the hat member. Therefore, structural members of a top wall with an impact input surface (hereinafter, referred to as forward hat member) suitably used in. Structural members of the structure 2 has a smaller degree of deformation with respect to impact applied to the closing plate. Therefore, structural members for closing plate and the impact input surface (hereinafter, referred to as reverse-hat member) suitably used in.
[0052]
　[Embodiment]
　FIG. 2A is a perspective view showing the configuration of a structural member 10 in this embodiment. Figure 2B is a side view of the structural member 10 shown in FIG. 2A in the longitudinal direction (y-direction). Figure 2C is a side view of the structural member 10 shown in FIG. 2A the direction perpendicular to the longitudinal direction (x-direction).
[0053]
　Structural member 10 shown in FIGS. 2A ~ 2C are provided with hat member 1 having a hat-shaped cross section, the closing plate 2 which is joined to the hat member 1. Hat member 1 and the closing plate 2, forms a closed section structural member of the tubular. The closed section structural member, the reinforcing member 4 is arranged. In the example shown in FIGS. 2A ~ Figure 2C, the reinforcing member 4 is attached to the hat member 1. In other words, the structural member 10 comprises a closed section structural member is formed in a hat member 1 and the closing plate 2, and a reinforcement member 4.
[0054]
　As shown in FIG. 2A, the hat member 1 has a top wall 13, a pair of side walls 11 and 12, a pair of flanges 14. A pair of side walls 11, 12 extending from both ends of the top wall 13, facing each other. A pair of flanges 14, in each pair of side walls 11 and 12, the one end portion of the top wall 13 of the side wall 11, 12 extending from the other end opposite to the opposite direction outside of the pair of side walls 11, 12. Closing plate 2 is provided by bonding a pair of flanges 14.
[0055]
　Boundary between the top wall 13 and a pair of side walls 11, 12 (shoulder) 123, forms the first ridge 123 extending in the longitudinal direction of the closed cross-section structural member. Longitudinal closed section structural member is the extending direction of the first ridge 123. Flange 14 and the boundary portion (shoulder portion) of a pair of side walls 11, 12 124, to form the second ridge 124 extending in the longitudinal direction of the closed cross-section structural member. In this example, the longitudinal direction of the closed cross-section structural member is the same as the extending direction of the second ridgeline 124. Incidentally, the longitudinal direction of the closed cross section member, the extending direction of the second ridge 124 may not be the same.
[0056]
　The height and the height of the other side wall 12 of one side wall 11 of the pair of side walls 11 and 12 each a H. Here, the height of the side walls 11 and 12, the first ridge 123 in the direction perpendicular to the top wall 13 (z direction) and the distance between the second ridge 124.
[0057]
　Longitudinal closed cross member (tubular portion) may also be referred to as longitudinal, axial or tubular portion of the tubular portion. In the example shown in FIG. 2A, the longitudinal direction of the closed cross section member is the y direction is the same as the longitudinal direction of the structural member 10. Further, the longitudinal direction of the closed cross-section structural member is the same as the direction of the central axis of the tubular portion (axial center).
[0058]
　The dimensions of the structural member 10 of the first ridge 123 and the extending direction of the second ridgeline 124 (y-direction) is longer than the dimension of the structural member 10 in the direction (x direction) in which the pair of side walls 11, 12 are opposed to each other going on. The length of the closed section structural member to be formed by the hat member 1 and the closing plate 2 (the longitudinal direction of the full-length) LY is more than six times the height H of the side walls 11, 12 i.e. 6H more (LY ≧ 6H ).
[0059]
　Each of the pair of side walls 11 and 12, provided with high-strength portion 11A, 12A and the low-strength portion 11B, a 12B. In each of the side walls 11 and 12, the high strength portion 11A, 12A and the low-strength portion 11B, 12B are arranged side by side in the extending direction of the first ridge 123 (y-direction). In this example, the side walls 11 and 12, the high strength portion 11A, 12A are disposed between the two low-strength portions 11B aligned in the extending direction of the first ridge 123 (y-direction).
[0060]
　High-strength portion 11A, 12A are provided on the mutually opposite portions of the pair of side walls 11, 12. That is, the high-strength portion 11A of the one side wall 11 of the pair of side walls 11 and 12, the high strength portion 12A of the other side wall 12 is provided at a position facing each other. Low strength portions 11B, 12B also, in each of the pair of side walls 11 and 12, is provided in a portion opposed to each other. That is, the low strength portion 11B of one of the side walls 11, the low-strength portion 12B of the other side wall 12 is provided in a portion opposed to each other.
[0061]
　Reinforcement member 4, in the extending direction of the first ridge 123 (y-direction), high strength portion 11A of the pair of side walls 11 and 12, is disposed at a position overlapping the 12A. The reinforcing member 4 is disposed so as to contact the top wall 13 and a pair of side walls 11, 12. The reinforcing member 4 also may be in contact with the first ridge 123 at both ends of the top wall 13, may not be in contact. The reinforcing member 4 is formed of a plate bent along two lines in the same direction as the first ridge 123. The bent portion of the reinforcing member 4 is a ridgeline 41. That is, the reinforcing member 4 has two edges 41. Two edges of the reinforcing member 4 may be in contact with the two first edge line 123 of the hat member 1, it may not be in contact.
[0062]
　In the extending direction (y direction) of the first ridge 123, ends 4a of the reinforcing member 4, the high strength portion 11A of the side walls 11 and 12, overlapping with 12A. That is, the reinforcing member 4, the high strength portion 11A in the extending direction of the first ridge 123 is disposed in a region overlapping with 12A. In the example shown in FIGS. 2A ~ Figure 2C, as viewed from a direction perpendicular to the surface of the side wall 11, 12 (x-direction), high strength portion 11A of the two ends 4a and side walls 11, 12 of the reinforcing member 4, 12A overlap . The high strength portion 11A of the side walls 11 and 12, a part of 12A, a part of the reinforcing member 4 is in contact. The reinforcing member 4 is not low strength portion 11B, and 12B contact. The reinforcing member 4 is, for example, by spot welding, is fixed to the closed cross-section structural member.
[0063]
　As shown in FIG. 2C, 1 from the extending direction of the ends 4a of in a direction away from the reinforcing member 4 in the extending direction of the first ridge 123 (y-direction) H of the first ridge 123 of the reinforcing member 4 / boundary 11AB high strength portion 11A and the low-strength portion 11B is disposed three times spaced locations in the range of up to 3/2 spaced locations of the H. That is, the both ends of the reinforcing member 4, the distance Lab to reach the first boundary in a direction away from the extending direction in the reinforcing member 4 of the ridge 123 11AB is, (1/3) H ≦ Lab ≦ ( and it has a 3/2) H. In other words, towards the outside of the longitudinal direction in the reinforcing member 4 of the closed section structural member from the edge of the reinforcing member 4, (1/3) H ~ (3/2) in the range of the distance H, the high strength portion 11A boundary 11AB low intensity portion 11B is disposed.
[0064]
　Also the position of the boundary of the high-strength portion 12A and the low-strength portion 12B of the other side wall 12, not shown in FIG. 2C, as with the side wall 11, from both ends 4a of the reinforcing member 4 in the direction of the first ridge 123 reinforcing member 4 (1/3) H ~ (3/2) is arranged in a range of H.
[0065]
　As described above, the reinforcing member 4, the high strength portion 11A of the side walls 11, 12, 12A and the low-strength portion 11B, by arranging the 12B, to concentrate the deformation due to impact load in the vicinity of opposite ends 4a of the reinforcing member 4 without, it can be dispersed low-strength portion 11B, to 12B. In this case, the high strength portion 11A, the yield strength of 12A, as more (980 MPa in the case of tensile strength) 500 MPa, it low strength portion 11B, the high strength portion 11A of the 11B, the intensity ratio 12A and 60-85% for in, high-strength portion 11A, a deformation caused by an impact to 12A, early, it is possible to disperse a low-strength portion 11B, to 12B. As a result, it is possible to suppress the bending deformation of the structural member 10 due to the impact.
[0066]
　In the example shown in FIG 2C, the distance Lab, (1/3) by the H ≦ Lab ≦ H, it can be further suppressed bending deformation of the structural member due to impact.
[0067]
　Note that in FIG. 2A ~ Figure 2C, no particular restriction on the distribution of the intensity and strength of the flange 14. This is because the strength of the flange 14 is because not have a particularly large impact on the performance of the structural member 10.
[0068]
　In the example shown in FIGS. 2A ~ Figure 2C, the low-strength portion 11B, 12B are provided outside the extending direction of the first ridge 123 at both ends 4a of the reinforcing member 4. That is, the low strength portion 11B, 12B, in each of the two side walls 11 and 12, are paired. That is, in the side wall 11 of one of the two side walls, a pair of low-strength portion 11B is provided on both sides of the high-strength portion 11A. In the other side wall 12 of the two side walls 11 and 12, a pair of low-strength portion 12B is provided on both sides of the high-strength portion 12A.
[0069]
　Arrangement example of the low strength portion is not limited to the above examples shown in FIGS. 2A ~ Figure 2C. For example, in at least one of the two side walls 11 and 12, the high strength portion 11A, may be disposed a low-strength portion on one side of 12A. Figure 2D is a side view showing an example of a case where the low strength portion 11B is provided on one side of the high-strength portion 11A. As shown in FIG. 2D, (1/3) from one end of both ends 4a of the reinforcing member 4 H ~ (3/2) in the range of H only it may be configured to low-strength portion is provided. In this case, it is possible to suppress the deformation degree in the vicinity of one end of the reinforcement member 4.
[0070]
　Low strength portions 11B, yield strength 12B is a high-strength portion 11A, 60 ~ 85% of the yield strength of 12A (60% or more 85% or less). The low strength portion 11B, tensile strength 12B likewise, high-strength portion 11A, it is preferable that 60 to 85% of the tensile strength of 12A. Thus, the strength increase due to deformation (work hardening) can be further suppressed deformation degree due to shock even when considering the.
[0071]
　High-strength portion 11A, 12A and the low-strength portion 11B, the portion 11C of the side walls 11 and 12 other than 12B, 12C that is, the outer portion in the low intensity portion 11B, the first extending direction of the ridge 123 of 12B (y-direction) 11C, the yield strength of 12C, the low strength portion 11B, is 12B more. For example, the yield strength of these portions 11C, 12C are low strength portions 11B, may be the same as the yield strength of 12B. Or, the yield strength of these portions 11C, 12C, the high strength portion 11A, may be the same as the yield strength of 12A. In this example, the low-strength portion 11B, 12B is low yield strength portion than around it.
[0072]
　Further, in the extending direction of the first ridge 123 (y-direction), the portion between the ends 4a of the reinforcing member 4 of the portion of the side wall 11, 12 that overlaps the reinforcing member 4 may not be high-strength portion . That is, in the longitudinal direction (y direction) of the closed section structural member yield strength of the portion of the side wall 11, 12 overlap from both ends 4a of the reinforcing member 4 and the inner central portion may be below the yield strength of the high-strength portion, it may be below the yield strength of the low strength portion.
[0073]
　In the structural member 10, the longitudinal direction (y-direction), i.e. the dimension in the extending direction of the first ridge 123 of the hat member 1 and the closing plate 2 are the same. The position of the longitudinal end portions of the hat member 1 and the closing plate 2 are aligned. In this case, the length in the longitudinal direction of the closed cross-section structural member (y-direction), the length in the longitudinal direction (y direction) of the structural member 10 are equal. In contrast, in the longitudinal direction of the closed section structural member may have different dimensions of the closing plate 2 hat member 1. Also, it may not be uniform position in the longitudinal direction of the end portion of the hat member 1 and the closing plate 2. That is, in the longitudinal direction of the closed cross section member, the length and the length of the closed section structural member of the structural member 10 may be different.
[0074]
　3 and 4 are diagrams for explaining the deformation behavior in case of colliding the indenter in a direction perpendicular to the longitudinal direction of the structural member having a reinforcing member and closed section structural member. Closed section structural member of the structural member 5 shown in FIG. 3 is formed by a hat member and the closing plate of uniform intensity distribution. Closed section structural member of the structural member 10 shown in FIG. 4 is formed in a hat member and the closing plate having a low strength portion 11B, 12B as shown in FIGS. 2A ~ Figure 2C. 3 and 4 illustrate the deformation behavior of the side surface of the structural member as viewed from a direction perpendicular to the longitudinal direction of the direction and the closed-section structural member of the indenter collision.
[0075]
　As shown in FIG. 3, the structural member 5 having a hat member having a uniform intensity distribution, the impact generated in the side walls and top wall near the end of the reinforcing member 4 is bending deformation origin P deformation, side It proceeds to be wedge-shaped in view. As a result, the structural member 5 is bent so as to protrude sharply bending direction (the direction of the impact). In some cases, the fall is cracked structural member 5.
[0076]
　As shown in FIG. 4, the structural member 10 having on both sides of the high-strength portion 11A low strength portion 11B (the region indicated by dots in FIG. 4), the deformation proceeds from a bending deformation origin P of the high-strength portion 11A to the inside is reached the boundary of the high-strength portion 11A and the low-strength portion 11B, it tends to proceed in relatively low strength transverse direction (longitudinal direction of the structural member 10). Therefore, deformation spreads in the longitudinal direction, deformation degree of the bending direction (the direction of impact) is reduced.
[0077]
　Incidentally, deformation behavior shown in FIGS. 3 and 4 is not limited to the case where collides the indenter to the structural member. For example, when the bending deformation by axial force to compress the structural member in the longitudinal direction and, as a three-point bending test, when added to a direction perpendicular force statically longitudinally pressing the indenter into the structural member bending deformation can be the same deformation behavior. Further, when allowed to collide the indenter top wall of the structural member and, in any case of colliding the indenter closing plate also becomes deformation behavior similar to FIGS.
[0078]
　For example, the structural member 10 is sometimes used in a state supported at two points spaced longitudinally. In this case, the structural member 10 includes two connecting portions is a portion coupled to the other member. In other words, the structural member 10 is supported on the other member in the connecting portion. Connecting portion may also be referred to as support. Connecting portion, side wall 11 and 12, is provided on at least one top wall 13 and closing plate 2.
[0079]
　The connecting portions, the structural member 10 is fixed to the other member. Connecting portions of the structural member 10, for example, it is joined to another member by fastening members or welding. The connecting portion may be three or more.
[0080]
　Two connecting portions may also be located away 6H above one another in the longitudinal direction of the structural member 10. That is, the interval KY the two connecting portions may also be more than 6 times the height H of the side walls 11,12 (KY ≧ 6H). Thus, (in the example of FIG. 2A, the height H of the side wall 11) dimension exerted impact of structural members with respect to, the longitudinal dimension KY two connecting portions, or about 6 times (KY ≧ for 6H), it has been found by the inventors that a situation in which the deformation degree of the structural member due to the impact in the longitudinal direction center portion increases may occur.
[0081]
　As a countermeasure, high-strength portion 11A, 12A and the low-strength portion 11B, 12B is provided between the two connecting portions. Furthermore, the high strength portion 11A, the reinforcing member is disposed in a portion that overlaps at 12A and the longitudinal direction. By this configuration, when an impact is applied between the two connection portions, it is possible to further reduce the projecting degree by deformation of the structural member 10.
[0082]
　When using the structural member 10 as a structural member for a vehicle, for example, the structural member 10 is attached to the vehicle while supporting at least two coupling portions spaced in the longitudinal direction of the closed cross-section structural member. At this time, the top wall 13 disposed outside of the vehicle, to place the closing plate 2 inside the vehicle, it is attached to the structural member 10 vehicle. Alternatively, place the closing plate on the outside of the vehicle, so as to place the top wall 13 to the inside of the vehicle, the structural member 10 is attached to the vehicle. Reinforcement member 4 both cases is located on the top surface 13 or the closing plate 2 on the outside of the vehicle. This makes it possible to structural member 10, in the event of an impact from outside the vehicle, to reduce the degree of projecting into the interior vehicle broken.
[0083]
　Or without coupling part, in the structural member 10 shown in FIGS. 2A ~ Figure 2C, the low-strength portion 11B, the dimension LB in the extending direction of the first ridge 123 12B is, (3/5) H or (( 3/5) is preferably H ≦ LB). This makes it possible to enhance the effect of suppressing deformation against impact. Low strength portions 11B, 12B dimension LB of, from the viewpoint of ensuring strength of the structural member 10, it is preferably less than or equal to 2H. More preferably, the dimension LB of the low-strength portion 11B, it is desirable that the H below.
[0084]
　Further, regardless of the presence of the connecting portion, it is preferable to arrange the high strength portion 11A, 12A and the reinforcement member 4 at the center in the longitudinal direction of the closed cross-section structural member. That is, the high strength portion 11A, at least a portion of at least a portion of 12A reinforcement member 4, it is desirable to configure so as to be positioned in the longitudinally central portion of the closed cross-section structural member. Center in the longitudinal direction of the closed cross-section structural member is one example of a likely point bending of the structural member 10. Alternatively, as described above, when connected to another member in a structural member 10 the two connecting portions, the center between the two connecting portions, it is desirable to place high-strength portion 11A, the 12A. That is, the high strength portion 11A, at least a portion of 12A is, it is desirable to configure so as to be positioned in the central portion between the two connecting portions. Thus, in either case with and without coupling part there is also, in the structural member 10, effectively a bending deformation of the largest becomes frangible portion moment due impact (middle point between the member center or connecting portion) it can be suppressed to.
[0085]
　Incidentally, a distance Lab between both ends 4a of the reinforcing member 4 to the boundary 11AB high strength portion 11A and the low-strength portion 11B, the relationship between the height H of the side wall 11, the above relationship, i.e., ((1/3) H ≦ Lab ≦ (3/2) H), more preferably, not limited to the case which satisfies exactly the ((1/3) H ≦ Lab ≦ H). But also the case that contains the degree of error can be regarded as satisfying the above relationship. Length LY of the structural member 10 to the height H of the side wall is also not limited to the case which satisfies the above relationship (6H ≦ LY) exactly. Approximately 6 times the structural member of the height H of the side wall, can be regarded as a structural member having the above relationship (6H ≦ LY). For example, the boundary of the low-strength portion and the high strength portion may be meandering rather than perpendicular to the longitudinal direction of the closed cross-section structural member. In this case, perpendicular to the imaginary plane to the lowest strength portion position and the highest intensity portion as the longitudinal direction of the intermediate position of the side of the nearer of the meander boundary, the boundary of the low-strength portion and the high strength portion is located I reckon.
[0086]
　Figure 5A is a top view showing the configuration viewed structural member 10 shown in FIG. 2A from the top (top wall 13, z direction). In Figure 5A, shows a portion of the side wall 11 and 12 appear to see through top wall 13 by a broken line. In the example shown in FIG. 5A, the high strength portion 11A, which face each other, of the two side walls 11, 12, 12A and the low-strength portion 11B, 12B are completely when viewed from the opposing direction of the two side walls 11, 12 (x-direction) It is arranged so as to overlap. That is, the whole high-strength portion 12A in the entire and the other side wall 12 of the high-strength portion 11A of one of the side walls 11 are overlapped when viewed from the opposing direction. Entire pair of low strength portion 12B in the entire and the other side wall 12 of the pair of low-strength portion 11B of one of the side walls 11 are overlapped when viewed from the opposing direction. Thus, the is suppressed bent twisted structural member 10 by the impact. In the example shown in FIG. 5A, the opposing direction of the two side walls 11 and 12 is perpendicular to the longitudinal direction (that is, the center axis Y1) of the closed section structural member.
[0087]
　In Figure 5A, the intensity distribution of one of the side walls 11 of the two side walls 11 and 12, and the intensity distribution of the other side wall 12, a configuration in which are mirror images of each other. That is, a pair of side walls 11 and 12 of the high-strength portion 11A, 12A and the low-strength portion 11B, 12B are arranged symmetrically with respect to the center virtual surface Y1 of the pair of side walls 11, 12. Accordingly, a possibility that either one resulting in collapse earlier of the pair of side walls 11, 12 is lower. Central imaginary plane Y1 side walls 11 and 12 corresponds to the vertical bisector A of the top surface portion 13 in a cross section perpendicular to the longitudinal direction of the closed cross-section structural member (see FIG. 2B).
[0088]
　For example, FIGS. 2A ~ 2C, in the example shown in FIG. 5A, a pair of side walls 11 and 12 are the same height. The angle between the side wall 11 and top wall 13, the angle between the side wall 12 and top wall 13 is also the same. Therefore, in a cross section perpendicular to the longitudinal direction of the tubular portion, the perpendicular bisector A of the top surface portion 13 as an axis, the cross-sectional shape of the structural member 10 has a symmetrical. Also, the intensity distribution in the cross section of the structural member 10, and has a symmetrical vertical bisector A as an axis. Thus, uneven stress due to impact is reduced.
[0089]
　5B is a diagram showing the high strength portion 11A of the structural member 10 shown in FIG. 2A, 12A and the low-strength portion 11B, a modification of the arrangement of 12B. In the example shown in FIG. 5B, the two side walls 11 and 12, a portion of the high-strength portion 11A of the one side wall 11, the entire high-strength portion 12A of the other side wall 12, viewed from the opposing direction (x-direction) It is arranged so as to overlap Te. And a low strength portion 11B of one of the side walls 11, the low-strength portion 12B of the other side wall 12 is disposed in a position that does not overlap when viewed from the opposing direction (x-direction). Note that in each of the two side walls 11 and 12, the high strength portion 11A, 12A and the low-strength portion 11B, 12B of the boundary 11AB, 12AB, the reinforcing member from both ends of the reinforcing member 4 in the extending direction of the first ridge 123 from 4 (1/3) H ~ (3/2) is arranged in a range at a distance of H. At least a portion of the low-strength portion 11B of one of the side walls 11, and a low strength portion 12B of the other side wall 12, may be disposed so as to overlap when viewed from the opposing direction.
[0090]
　In the example shown in FIG. 5B, the first length in the extending direction of the ridge 123, a first extending direction of the ridge 123 of the low-strength portion 12B of the other side wall 12 of the low-strength portion 11B of one of the side walls 11 of is different from the length. In addition to this example, the length in the extending direction of the first ridge 123 of the low-strength portion 11B and the low-strength portion 12B of the other side wall 12 of one of the side walls 11 may be the same.
[0091]
　Figure 6A is a diagram illustrating a modification of the arrangement of the low-strength portion 11B, 12B of the structural member 10 shown in Figure 2A. In the example shown in FIG. 6A, a portion in the height direction of the side wall 11 (z-direction), the low-strength portion 11B is provided. That is, in the side wall 11, a portion between the ends of the top wall 13 side to the end portion of the flange 14 side, the low-strength portion 11B is provided. Low strength portions 11B, in the height direction of the side wall 11 is provided between the one end 11a of the side wall 11 (top wall 13) from the position of the distance h, to the position of the distance hb from the other end 11b (flange 14) . That is, the end portion 11Ba which is closer to the one end 11a of the low-strength portion 11B (one end side), whereas there from the end 11a at a distance h, closer to the other end 11b of the low-strength portion 11B (the other end end 11Bb of) lies from the other end 11b at a distance hb. Low strength portions 11B has one end 11a (top wall 13) and the other end 11b (flange 14) is not in contact to both. Although not shown, the low-strength portion 12B of the side wall 12 that faces the low-strength portion 11B is also provided on a part of the height direction of the side wall 12. That is, each of the pair of side walls 11 and 12, the low strength portion 11B on a part of the height direction, is allowed to have a 12B. Even the modification shown in FIG. 6A, it is possible to suppress the protrusion degree by deformation of the structural member 10 of an impact.
[0092]
　In this case, in order to suppress the deformation degree, the distance h in the height direction of the side wall 11 from one end 11a to the end portion 11Ba which is closer to the one end 11a of the low-strength portion 11B of the side wall 11, one end of the side walls 11 from 11a to the other end 11b length SL is preferably set to 1/4 or less of the (SL = H in the example of FIG. 6A) (h ≦ SL / 4). On the one hand from the end 11a in the height direction of the side wall (1/4) in the region of the distance SL, it is desirable to place the end 11Ba of the one end 11a side of the low-strength portion 11B. From the viewpoint of suppressing the deformation degree, it is more preferable that the distance h between (1/5) SL below (h ≦ SL / 5). Yield strength between the end 11Ba and the one end 11a which is closer to the one end 11a of the low-strength portion 11B is higher than or more and the low strength portion 11B 500 MPa. For example, it may be a yield strength between the end 11Ba of the one end 11a and the low-strength portion 11B of the side wall 11 as the same as the yield strength of the high-strength portion 11A, 12A.
[0093]
　In order to suppress the deformation degree, the distance in the height direction of the side wall 11, 12 from the other end 11b of the side walls 11 and 12 to the low-strength portion 11B, 12B hb is, (4/5) SL below (hb ≦ 4SL / 5 ) that it is desirable to. To further suppress the deformation degree, the distance hb is preferably set to (1/2) SL below (hb ≦ SL / 2).
[0094]
　However, very any value h and hb described above is allowed, in order to suppress the deformation degree, the size hc low intensity portion 11B, the height direction of the side wall 11, 12 of the 12B (z direction) is always (1 / 5) is required to be more than SL in order to suppress ((SL / 5 ≦ hc). further deformation degree, the dimensions hc is (1/4) is desirably set to at least SL ((SL / 4 ≦ hc).
[0095]
　Figure 6B in Figure 6A described above, it is a diagram showing a modified example in which h = 0. In the example shown in FIG. 6B, one end 11a of the side walls 11, has an end portion 11Ba of the one end 11a side of the low-strength portion 11B.
[0096]
　Figure 6C in Figure 6A described above, it is a diagram illustrating a modification in which the hb = 0. In the example shown in FIG. 6C, the other end 11Bb of the side wall 11, it has an end portion 11Bb of the other end 11b side of the low-strength portion 11B.
[0097]
　As illustrated in FIGS. 6A ~ FIG 6C, a low intensity so that the area from one end of the height direction of the ends of the side walls (1/4) up to SL, the end of the one end of the low-strength portion is located section to form a. That is, the low strength portion is formed on at least a part of the region from the position on the side wall at a distance from one end of the side wall of the (1/4) SL up to one end of the side walls. Thus, when an impact is applied from one end side of the side wall, it is possible to reduce the degree of deformation of the structural member 10. Furthermore, to position the ends of the other end of the low-strength portion in a region from the other end (4/5) up to SL of the height direction of the ends of the side walls, it is allowed to form a low-strength portion . However, in order to suppress the deformation degree, the size in the height direction of the side wall of the low-strength portion is required to be at least 1 / 5SL more.
[0098]
　In the example shown in FIG. 6A ~ FIG 6C, among the ends of the side walls 11 and 12, and one end towards which is in contact with the top wall 13, a person who is in contact with the flange 14 as the other end, the distance h, hb, It was set hc. In this case, the distance as described above h, hb, by setting the value of hc, it is possible to reduce the degree of deformation of the structural member 10 when an impact is applied to the top wall 13. In other words, the structural member 1 shown in FIGS. 6A ~ 6C are preferably used in order hat member to a top wall with an impact input surface. In contrast, among the height direction of the ends of the side walls 11 and 12, and one end towards which it is in contact with the flange 14, a person who is in contact with the top wall 13 as the other end, the distance h, hb, the hc settings can also be. In this case, as in the above example, the distance h, hb, it is possible to set the value of hc. Thus, it is possible to further reduce the degree of deformation of the structural member 10 when an impact is applied to the closing plate 2. In this case, the structural member 1 is suitably used in the reverse-hat member closing plate an impact input surface.
[0099]
　Figure 7A is a sectional view showing a modification of the cross-sectional shape of the structural member 10 described above. Structural member 10 shown in FIG. 7A, a pair of side walls 11, 12 having different shapes. A pair of side walls 11 and 12, the angle and against the flange 14, 14, different heights HR, HL each other. Therefore, they have different positions in the height direction of the pair of flanges 14 and 14. Thus, if the cross section of the structural member 10 is not symmetrical, the height H1, H2 of each of the pair of side walls 11 and 12, defined separately.
[0100]
　In the example shown in FIG. 7A, the side wall 11 of one of the pair of side walls 11 and 12, it has a step. Thus, even if there is a step on the side wall 11, from one end in contact with the top wall 13 of the side wall 11, the height dimension to the other end in contact with the flange 14, the height H1 of the side wall 11. That is, in the height direction, a dimension of up to the highest position from the lowest position of the side wall 11, and the height H1 of the side wall 11. The side wall 11, the same applies to the case where there are irregularities or pores. In this case, the height direction is a direction perpendicular to the top wall 13.
[0101]
　R (curved portion) is formed in the boundary portion of the other side wall 12 and top wall 13 of the pair of side walls 11, 12. That is, the portion that is connected to one end of the side wall 12 has a rounded curved shape. Thus, the surface of the first ridge 123 of the boundary between the side wall 12 and top wall 13 (shoulder) is a curved surface. The R (curved portion), as a part of the side wall 12, the height H2 of the side wall 12 is determined. Ie, R the edge of top wall 13 side (curved portion) and R boundary (R stoppage). The side walls of the R boundary as one end in the height direction of the side wall 11 the height H is determined.
[0102]
　Although not shown, the side wall 12 and the R (curved portion) in the boundary portion of the flange 14 may be formed. In this case, the side wall 12 and a second surface of the ridge 124 of the boundary between the flange 14 is a curved surface. The side wall 12 and the flange 14 and the R (curved portion) between even as part of the side wall 12, the height 12 of the sidewall 12 is determined. That is, the edge of the flange 14 of the R (curved portion) and R boundary (R stoppage). The height H of the side walls of the R boundary as the other end of the height direction of the side wall 11 is determined.
[0103]
　Although not shown, top wall 13, side walls 11 and 12, at least one surface of the flange 14 and the closing plate 2 may be curved rather than planar. In other words, top wall 13, side walls 11 and 12, at least one of the flanges 14 and closing plate 2 may be curved.
[0104]
　7B is a cross-sectional view showing a modification of the closing plate 2. In the example shown in FIG. 7B, closing plate 2 has a shape protruding in a direction away from the hat member 1. Specifically, closing plate 2 includes a junction 2b to be joined with the flange 14 of the hat member 1, the intermediate portion 2a between the junctions. Intermediate portion 2a has a shape protruding in a direction away from the hat member 1. Virtual line K1 connecting the joint 2b of closing plate is between the top wall 13 and the closing plate 2. In this example, the cross-sectional shape of the closing plate 2 is in the hat. The outer surface of the intermediate portion 2a may outer surface of the joint 2b and be made substantially parallel.
[0105]
　In this manner, by the shape obtained by projecting a direction away closing plate 2 from the hat member 1, it is possible to adjust the height dimension of the structural member 10. The value of the height of the side walls as a reference of arrangement of the low-strength portion and a high-strength portion (H, H1, H2) does not vary with the height dimension of the closing plate 2. Also, some virtual line K1 is to be located between the top wall 13 and the closing plate 2 may be formed hat member 1 and the closing plate 2.
[0106]
　Above with reference to FIGS. 7A and 7B, described asymmetric shape of the hat member 1, a step, the side wall end parts R, the shape of the closing plate 2, the plurality of features and the like. Other forms that combine all of the plurality of features (example shown in FIG. 7A or FIG. 7B), also structural member 10 employing at least one of the plurality of features are included in embodiments of the present invention.
[0107]
　Figure 8 is a diagram for explaining a height direction of the side wall 11, 12 when the top wall 13 is inclined. Figure 8 is a diagram showing the height direction of the structural member 10 where it is assumed impacted on the top surface 13. In the structural member 10 shown in FIG. 8, the top wall 13 of the hat member 1, the flange 14, 14 are not parallel. Further, the different lengths of the z direction of the one side wall 11 and the other side wall 12. If the top wall 13 is subjected to impact is assumed, the height direction of the side wall 11 and 12, and the direction perpendicular to the top wall 13. Height H1, H2 of each side wall 11 and 12 is determined in the height direction of the side walls 11, 12 as a reference. In the case where the closing plate 2 it is assumed that shocked, a direction perpendicular to the closing plates, and the height direction of the side wall 11, 12.
[0108]
　Figure 9 is a high-strength portion 11A of the case where the height H1, H2 of the two side walls 11 and 12 are different (H1 ≠ H2), 12A, low strength portions 11B, 12B and view for explaining an arrangement of the reinforcing member 4 it is. Figure 9 is a view of a structural member 10 having a height H1, H2 are two different side walls 11, 12 from the top wall 13 side (z-direction). 9 shows a portion of the side wall 11 and 12 appear to see through top wall 13 by a broken line.
[0109]
　In the example shown in FIG. 9, in the extending direction of the first ridge 123 (y-direction), both ends 4a of the reinforcing member 4, the high strength portion 11A of the side walls 11 and 12, overlapping with 12B. 1/3 to 3/2-fold spaced-apart regions L1 of the extending direction (y direction) in a direction away from the reinforcing member 4 H1 between both ends 4a first ridge 123 of the reinforcing member 4, the H2 1 / the overlapping range between 3 to 3/2-fold spaced-apart regions L2, side walls 11 and 12 of the high-strength portion 11A, 12A and the low-strength portion 11B, 12B of the boundary 11AB, 12AB are arranged. That is, the distance Lab in the extending direction of the first ridge 123 from the opposite ends 4a of the reinforcing member 4 is, (1/3) H1 ≦ Lab ≦ (3/2), and, (1/3) H2 ≦ Lab ≦ (3/2) in the region is H2, the side walls 11 and 12 of the high-strength portion 11A, 12A and the low-strength portion 11B, 12B of the boundary 11AB, 12AB are arranged.
[0110]
　In the example shown in FIG. 9, each of the low-strength portion 11B of the two side walls 11, 12, 12B are both reinforcing member from both ends 4a of the reinforcing member 4 in the extending direction of the first ridge 123 (y-direction) 1/3 to 3/2-fold spaced-apart regions L1 of H1 in a direction away from the 4, is disposed within overlapping range between 1/3 to 3/2-fold spaced-apart regions L2 of H2. That is, the low strength portion 11B in the extending direction of the first ridge 123, end remote from the reinforcing member 4 of the ends of 12B will in the above-mentioned regions L1, L2. In contrast, the low strength portion 11B, a part of 12B, may be arranged outside of the area L1, L2.
[0111]
　Figure 10A ~ 10C are cross-sectional views showing a modification of the structural member in the present embodiment. Figure 10A ~ FIG. 10C shows a cross-sectional shape in a plane perpendicular to the longitudinal direction (y direction) of the structural member. Examples shown in FIGS. 10A and 10B is an example of the structure 4. Example shown in FIG. 10C is an example of the structure 3. Figure 10D is a top view of the structural member shown in FIG. 10B in the z-direction.
[0112]
　In the modification shown in FIGS. 10A ~ FIG 10C, instead of the hat member comprising two flanges, channel member which includes a flange-free channel member or one of the flanges is used. Structural member 10 shown in FIGS. 2A ~ 2C are first ridge 123 and the second ridge 124 at both ends of the side wall 11, a and difficulty of deformation with respect to the vertical direction of the load to the top wall 13 (flexural rigidity) it is a contributing structure. In contrast, in the modification shown in FIG. 10A ~ FIG 10C, at least one of the two side walls, and has a contributing structure to the first ridge and the joint bending stiffness across the sidewall.
[0113]
　Structural member 10g shown in FIGS. 10A ~ FIG 10C, 10h, 10i are both provided with a channel member 31 of the channel, the closing plate 2 is joined to channel member 31, and a reinforcing member 4. Channel member 31 shown in FIGS. 10A ~ FIG. 10C, a top wall 13, two side walls 11, 12 extending from both ends of the top wall 13, joining the channel member 31 and the closing plate 2 two junctions 3r, equipped with a 3h. Two side walls 11, 12 facing each other. Two junctions 3r, 3h are provided on a part and closing plate 2 and are superimposed portions of the channel member 31. Joint 3r, 3h, for example, a spot weld or a laser weld. If the joint is arranged in a discontinuous (intermittent) in the longitudinal direction (i.e. the extending direction of the first ridge 123) of the channel member 31, the joining portion in connecting a discontinuous joint position regarded as. That is, considered that there is a joint on a line connecting between a plurality of joints which are intermittently arranged. Between the junction and the first ridgeline is sidewall. Between the top wall 13 and two side walls 11 and 12, respectively, there is a first ridge 123, 123. For example, in the example shown in FIG. 10D, a plurality of joint portions 3h are arranged in the y direction (the extending direction of the first ridge 123). Virtual line 300 (the extending direction of the first ridge 123) y direction connecting the plurality of joint, the joint line.
[0114]
　The reinforcing member 4 is adjacent to at least a portion of the top wall 13. In the example shown in FIGS. 10A ~ FIG 10C, the reinforcing member 4 is disposed on the outside of the formed closed cross member in channel member 31 and the closing plate 2. Reinforcement member 4 may be arranged inside the closed cross-section structural member. The reinforcing member 4 may be in contact with a portion of the top wall 13, it may not be in contact.
[0115]
　In channel-shaped member 31 shown in FIGS. 10A and 10B, 2 two side walls 11 and 12 includes a first sidewall 11 and second sidewall 12. The other end opposite the one end portion of the top wall 13 side of the first side wall 11 is bent. Flange 14 extends from the bent portion of the other end portion of the first side wall 11. Flange 14 is overlapped with the closing plate 2. Flange 14 has a contact surface in contact with the closing plate 2. Flange 14 and the closing plate 2 are joined together at the junction 3r.
[0116]
　The first side wall 11 is located between the first ridge 123 and the flange 14 of one of the two first ridge 123, 123. Flange 14 and between the first side wall 11 is a second ridge 124. The second ridge 124 is an end portion of the flange 14. The second ridge 124 extends in the longitudinal direction (y direction) of the first ridge line 123 in the same direction, that channel member 31.
[0117]
　The height H1 of the first side wall 11, the height of the first sidewall 11 in the direction perpendicular to the top wall 13, i.e., the direction perpendicular to the top wall 13 of the first ridge 123 and the second ridge 124 it is the distance in.
[0118]
　The second sidewall 12 is located between the two first ridge 123 and junction 3h of the other of the first ridge 123, 123. The second side wall 12 is not bent. Some joint 3h side of the second side wall 12, is superimposed and the closing plate 2. That is, part of the bonding portion 3h of the second side wall 12 has a contact surface 1dh that contacts the closing plate 2. The second side wall 12 extends in the same direction as the contact surface 1Dh.
[0119]
　The height H2 of the second side wall 12, the distance between the first ridge 123 and junction 3h in the direction perpendicular to the top wall 13.
[0120]
　In channel-shaped member 31 shown in FIG. 10C, the two side walls 11 and 12, two first edges 123, 123, two junctions 3r, between 3h, respectively located. The height H1 of the one side wall 11 of the two side walls is the distance in a direction perpendicular to the top wall 13 between the first ridge 123 and junction 3r. The height H2 of the other side wall 12 of the two side walls, a distance in a direction perpendicular to the top wall 13 between the first ridge 123 and junction 3h.
[0121]
　In channel-shaped member 31 shown in FIGS. 10A ~ FIG 10C, the side walls 12 each of the first side wall 11 and 22, high-strength portion 11A and the low-strength portion 11B is aligned in the extending direction of the first ridge 123 disposed It is. In the extending direction of the first ridge 123, the reinforcing member 4 is arranged in a region overlapping with the high-strength portion 11A (as an example, see FIG. 10D). In the extending direction of the first ridge 123, ends 4a of the reinforcing member 4 is overlapped with the high-strength portion 11A and the high strength portion 12A of the second side wall 12 of the first side wall 11. A region from both ends 4a to 1/3 to 3/2-fold spaced locations of the height H1 of the first side wall 11 in the extending direction of the first ridge 123 of the reinforcing member 4, from both ends 4a of the reinforcing member 4 the overlapping range between the height H2 of 1/3 to 3/2-fold spaced-apart regions to the position of the first ridge 123 in the extending direction to the second side wall 11, the high strength portion 11A and the low-strength portion 11B boundary 11AB are arranged. High-strength portion 11A, the yield strength of 12A is not less than 500 MPa. Low strength portions 11B, yield strength 12B, the high strength portion 11A, 60 to 85% of 12A. The high strength portion and a low strength portion of the channel member 31, a structure similar to that of any of the above Figure 2, Figure 5, the high strength portion and a low strength portion of the structural member shown in FIG. 6, and 9 can.
[0122]
　In the example shown in FIG. 10A, a first side wall 11 second side wall 12 are parallel to each other. In contrast, in the example shown in FIG. 10B, a first side wall 11 second side wall 12 are not parallel to each other. In the example shown in FIG. 10B, a first side wall 11 second side wall 12, the distance from the top wall 13, and it extends so that the distance therebetween becomes large. In this example, the first side wall 11 extends in a direction perpendicular to the top wall 13. The second side wall 12 extends in a direction having an angle with respect to the axis perpendicular to the top wall 13. Flange 14 extends outwardly from the other end portion of the closing plate 2 side of the first side wall 11. Structural members having a cross section as shown in FIGS. 10A ~ FIG. 10C, for example, can be applied to a vehicle structural member such as the A-pillar.
[0123]
　In the example shown in FIGS. 10A and 10B, closing plate 2 has a bent portion that is bent out of plane. Closing plate 2 in the extending direction of the ridge 2abh formed in the bent portion (y direction), the extending direction of the boundary line between the contact surface 1dh and closing plate 2 and does not contact surface in contact with the closing plate 2 in the side wall 12 is the same as that. The extending direction of the ridge 2abh formed in the bent portion of the closing plate 2 may be the same as the extending direction of the first ridge 123.
[0124]
　In the example shown in FIG. 10C, 2 two side walls 11 and 12 are both not bent. That is, the contact surface 1dr the sidewall 11 is in contact with the closing plate 2, extend in the same direction as the side wall 11. Contact surface 1dh the sidewall 12 is in contact with the closing plate 2, extend in the same direction as the side wall 12.
[0125]
　Closing plate 2 comprises two contact portions 2br contacting is superposed with channel member 31, and 2bh, two contact portions 2br, the intermediate portion 2a between 2bh. An intermediate portion 2a, 2 one contact portion 2br, during 2bh is bent. An intermediate portion 2a, 2 one contact portion 2br, ridge 2Abr, the extending direction of the 2abh the contact surface 1DR, 1Dh each side wall 11 in contact with the closing plate 2 at the side walls 11, 12 formed between the 2bh, is the same as the extending direction of the boundary line between the surface not in contact with the closing plate 2 in 12.
[0126]
　Figure 10A ~ FIG 10C are shown structural member 10 g, 10h, also in 10i, the same effect as the structural member 10 shown above in FIG. 2A ~ Figure 2C is obtained. The bonding section 3r, 3h is not limited to the weld. For example, fasteners such as screws, adhesive, or the adhesive portion of the brazing may be used as the joint. Further, in the above example, the direction of the height H1, H2 of the reference side walls 11 and 12 is a direction perpendicular to the top wall 13. In this case, the structural member, the deformation of the case impacted on the top surface portion 13 is further suppressed. Similarly to the structural member 10 shown in FIGS. 2A ~ Figure 2C, FIG. 10A, the structural member 10g shown in FIG. 10B, even in 10h, no particular restriction on the distribution of the intensity and strength of the flange 14. Furthermore, the structural member 10g shown in FIGS. 10A ~ FIG 10C, 10h, also the portion near the end of the junction 3h of channel member 31 in 10i also not particularly limited for the distribution of the intensity and strength. This part corresponds to the flange 14, since the distribution of the intensity and strength of this portion does not adversely structural member 10 g, 10h, particularly large impact on the performance of 10i.
[0127]
　In the example shown in FIGS. 2A ~ Figure 2C, the structural member 10 is formed to extend linearly in the longitudinal direction. In contrast, structural member 10 may be curved. For example, the structural member 10 may be a curved shape so as to be convex on the top surface 13 side or the closing plate 2 side. That is, the outer surface or the outer surface of the closing plate 2 of the top surface portion 13 may be curved structural members 10 so as to project. Curved structural member so as to project on the top surface side is preferably used in order hat member. It curved structural member so as to be convex toward the closing plate side is suitably used in the reverse-hat member.
[0128]
　Figure 11A ~ FIG. 11D is a side view showing an example of a structural member 10 which is curved in the longitudinal direction. In the example shown in FIGS. 11A ~ FIG 11D, the structural member 10 is curved to be convex top wall 13 side. In FIG. 11A, the structural member 10 is curved at a constant curvature throughout the longitudinal direction. In FIGS. 11B and 11C, the curvature in accordance with the position in the longitudinal direction of the closed cross-section structural member of the structural member 10 (the extending direction of the first two lines) is changing. In Figure 11D, the structural member 10 is curved in a part of the length. In the example shown in FIGS. 11A and 11D, the structural member 10 is curved so as to be symmetrical as viewed from a direction perpendicular to the side walls 11, 12 (x-direction). 11B, the structural member 10 of FIG. 11C, and 11D includes a curved a portion (a curved portion) and a portion extending in a straight line (straight line portion). In the example shown in FIG. 11C, the bending portion is disposed on both longitudinal sides of the straight portion. That is, the straight line portion is arranged between the curved portion. In the example shown in FIG. 11D, the linear portions are arranged on both sides in the longitudinal direction of the bending portion.
[0129]
　By thus curving the structural member 10, it is possible to improve impact resistance against an impact in the direction opposite to the convex direction of the bending. For example, structural members formed by support both ends of the curved structural member 10, with respect to the direction of the impact faces the convex direction of the bending, with a high impact resistance. Therefore, when applying the structural member 10 to the motor vehicle, the convex direction is structural member 10 to face the outer side of the vehicle body is disposed.
[0130]
　In the example shown in FIGS. 11A and 11D, a pair of low-strength portion 11B between them in the high-strength portion 11A of the side wall 11 are both disposed on the curved portion of the structural member 10. In the example shown in FIGS. 11B and 11C, a pair of low-strength portion 11B between them in the high-strength portion 11A of the side wall 11 are both arranged in a linear portion of the structural member 10. When placing the low strength portion 11B and the high strength portion 11A on the straight portion, it is preferable to arrange the high-strength portion 11A in the middle of the straight portion. Thus, the high strength portion 11A is disposed in a portion moment increases when subjected to impact, high impact resistance is obtained.
[0131]
　Placement of the reinforcing member in the structural member is not limited to the above example. Figure 12A ~ FIG. 12D is a diagram illustrating a modification of the arrangement of the reinforcement member 4. Additional FIG 2, FIG. 5, in the example shown in FIG. 6, and 9, the reinforcing member 4, one end of the height direction of the side wall 11, 12 (first ridge 123) from the other end parts are arranged in contact with part of the (second ridge 124) to the region. In contrast, in the example shown in FIG. 12A, the reinforcing member 4, the other end portion from one end portion in the height direction of the side wall 11, 12 (first ridge 123) (second ridge 124) It is arranged in contact throughout. The reinforcing member 4 is, for example, as shown in FIG. 12B, in contact with the side wall 11 and 12, it may be arranged so as not to contact with the top wall 13. Structural member shown in FIG. 12A is suitably used for both the forward hat member and the reverse-hat member. Structural member shown in FIG. 12B is suitably used in the reverse-hat member. Further, in FIGS. 12A and 12B, the reinforcement member 4 may be arranged in contact to the flange 14. That is, the reinforcing member 4 may be in contact with both the side walls 11 and 12 and the flange 14.
[0132]
　FIG 2, FIG. 5, in the structure member shown in FIG. 6, and 9, the reinforcing member 4 is arranged to contact the outer surface of the closed section structural member. In contrast, for example, as shown in FIG. 12C, a reinforcing member 4 may be arranged so as to contact the inner surface of the closed section structural member. In the example shown in FIG. 12C, the reinforcing member 4, an inner surface of the closed section structural member top wall 13 is disposed so as to contact the inner surface of the closed section structural member side walls 11, 12. In this case, the reinforcing member 4 is formed of a plate bent along two lines in the same direction as the first ridge 123. The bent portion of the reinforcing member 4 is a ridgeline 41. That is, the reinforcing member 4 has two edges 41. Two edges of the reinforcing member 4 may be in contact with the two first edge line 123 of the hat member 1, it may not be in contact.
[0133]
　For example, as shown in FIG. 12D, the reinforcement member 4 may be arranged on the closing plate 2. In this case, the reinforcing member 4 contributes to the improvement of the rigidity of the structural member 10 against the impact of the closing plate 2.
[0134]
　Also, as in the example shown in FIG. 12E, the reinforcing member 4 may be arranged in contact with the inner side of the closing plate 2 and closed-section structural member. Figure 12E is a view showing a cross section taken along a plane perpendicular to the y direction of the structural member 10. In the example shown in FIG. 12E, the closing plate 2 has a through-hole. The reinforcing member 4 is inserted into the through hole of the closing plate 2. Reinforcement member 4, the closing plate 2 are disposed so as to contact the top wall 13 and side walls 11, 12 of the hat member 1. In this example, the cross-section of the reinforcing member 4 is hat. Reinforcement member 4 has a top wall 43, a two side walls 41, 42 and two flanges 44,. Two side walls 41 and 42 extend from both ends of the top wall 43. Two flanges 44 extend from opposite ends and top wall 43 of the two side walls 41, 42 away from each other. Top wall 43 of the reinforcing member 4 is in contact with the top wall 13 of the hat member 1. Side walls 41, 42 of the reinforcing member is in contact with the side walls 11, 12 of the hat member. Flange 44 of the reinforcement member 4 is in contact with the closing plate 2. In the example shown in FIG. 12, the reinforcing member 4 contributes to the improvement of the rigidity of the structural member 10 with respect to both the impact and the closing plate 2 impacts to the top wall 13.
[0135]
　In the example shown in FIG. 12F, the reinforcing member 4 is provided on an end of one of the first ridge 123 at both ends of the top wall 13. Specifically, the reinforcing member 4, when viewed from the longitudinal direction (y direction) of the closed section structural member, in contact with the portion close to the one of the first ridge 123 of the two than the center of the top wall 13 state, is fixed to the closed cross-section structural member. The reinforcing member 4 is formed to extend over the side wall 12 of one of the first ridge 123 two side walls 11, 12 from the near end to the top wall 13. In this way, by disposing the reinforcing member 4 so as to contact the portion close to one of the first ridge 123 of the two than the center of the top wall 13, thereby improving the rigidity of the structural member to the shock to the top surface portion.
[0136]
　In the example shown in FIG. 12G, the interior of the closed section structural member, the reinforcing member 4 of the tubular is located. Reinforcing member 4 of the tubular in a state of being in contact with the inner surface of the two side walls 11 and 12, is fixed to the side wall 11, 12. Axial reinforcement member 4 of the tubular (longitudinal direction) is the same as the longitudinal direction of the closed cross-section structural member. In the example shown in FIG. 12G, the reinforcing member 4 of the tubular is not in contact with either of the top wall 13 and closing plate 2. As a further modification, the reinforcing member 4 of the tubular may be in contact with either of the top wall 13 and closing plate 2.
[0137]
　In the example shown in FIG. 12H, the inside of the closed section structural member, a plate-like reinforcing member 4 is arranged. Both ends of the plate-like reinforcing member 4 is in a state of being in contact with the inner surface of the two side walls 11 and 12, is fixed to the side wall 11, 12. Plate-like reinforcing member 4 is not in contact with any of the top wall 13 and closing plate 2. Distance SA of the plate-like reinforcing member 4 and the closing plate 2 is the distance KA less. The distance KA is the height in a direction perpendicular to the closing plate 2 of the curved portion at the boundary between the side walls 11, 12 and the flange 14 (R). In other words, the distance KA is curved part at the boundary between the side walls 11, 12 and the flange 14 (R) side walls 11 and 12 side of the R boundary (R blind) with Rd1, the distance between the inner surface of the closing plate 2.
[0138]
　With respect to the direction perpendicular load to the closing plate 2, the bending portion at the boundary between the side walls 11, 12 and the flange 14 is easily crushed, portions other than the curved portion of the side wall 11, 12 has a high yield strength. For example, in a configuration without the reinforcement member 4, if the closing plate 2 impact is input, crushed curved portion, tends to be partially resistant to shock structure from R boundary wall 11, 12 to the first ridge 123 . As shown in FIG. 12H, the reinforcing member 4 and the closing plate 2 distance SA distance KA less ie By following the height of the curved portion, it is possible to suppress the deformation of the curved portion during the impact input. As a result, it improves the rigidity of the structural member to the impact to the closing plate 2.
[0139]
　In the example shown in FIG. 12I, the reinforcing member 4, the outside of the closed cross section, in contact with both the flange 14 and the side wall 11, 12. Reinforcement member 4 is fixed to both the flange 14 and the side walls 11 and 12. The reinforcing member 4 is formed to extend from the flange 14 to a region spaced distance KA or from closing plate 2 side walls 11 and 12. That is, the reinforcing member 4 is provided with a flange 14, in contact with a portion away from the closing plate 2 side walls 11 and 12 a distance KA or more, and is fixed. Distance KA is the height in a direction perpendicular to the closing plate 2 of the curved portion at the boundary between the side walls 11, 12 and the flange 14 (R). Distance KB from the end closest to the first ridge 123 of the reinforcing member 4 until closing plate 2 is longer than the distance KA (KB> KA). Thus, by providing the reinforcing member 4 in contact with the flange 14 and the side walls 11 and 12, to suppress the bend between the side walls 11, 12 and the flange 14 (R) is deformed by the impact against the closing plate 2 can. As a result, it improves the rigidity of the structural member to the impact to the closing plate 2.
[0140]
　In the example shown in FIG. 12 J, the closing plate 2, between the portion in contact with the two flanges 14, a recess 2d recessed into the interior of the closed cross-section structural member. Reinforcement member 4, inside the closed cross section member, is arranged to contact with the recess 2d. Both ends of the reinforcing member 4 is in a state of being in contact with two side walls 11 and 12, it is fixed to the two side walls 11, 12. Reinforcing member 4 shown in FIG. 12J is a plate-shaped. Incidentally, the reinforcing member 4 may be tubular. Depth DA of the closing plate 2 in the vertical direction of the concave part 2d (z-direction) is less than 2/5 ie 40% of the length from the first ridge 123 of the side walls 11, 12 to the second ridge 124 .
[0141]
　Incidentally, the reinforcing member 4 may not be in contact with the recess 2d. In this case, the distance to the closing plate 2 in the vertical direction between the reinforcing member 4 and the recess 2d, the distance KA less. The distance KA is the height in a direction perpendicular to the closing plate 2 of the curved portion at the boundary between the side walls 11, 12 and the flange 14. The height of the curved portion is a distance from the closing plate 2 to R blind Rd1 wall 11 side. By the distance between the reinforcing member 4 and the recess 2d and the distance KA less, it is possible to suppress deformation caused by an impact of the curved portion of the boundary between the flange 14 and the side wall 11, 12. Thus, inside the closed cross section member, by providing the reinforcing member 4 so as to be adjacent to the recess of the closing plate 2, thereby improving the rigidity of the structural member to the impact to the closing plate 2.
[0142]
　In the example shown in FIG. 12K, top wall 13 has a recess 13d that is recessed into the interior of the closed cross-section structural member. Reinforcement member 4, inside the closed cross section member, is arranged to contact with the concave portion 13d. Both ends of the reinforcing member 4 is in a state of being in contact with two side walls 11 and 12, it is fixed to the two side walls 11, 12. Reinforcing member 4 shown in FIG. 12K is a plate-shaped. Incidentally, the reinforcing member 4 may be tubular. Both ends of the reinforcing member 4 is in a state of being in contact with two side walls 11 and 12, it is fixed to the two side walls 11, 12. Depth DB in the direction perpendicular to the top wall 13 of the recess 13d (z-direction) is less than 2/5 ie 40% of the length from the first ridge 123 of the side walls 11, 12 to the second ridge 124 .
[0143]
　Incidentally, the reinforcing member 4 may not be in contact with the concave portion 13d. In this case, the distance in the direction perpendicular to the top wall 13 between the reinforcing member 4 and the recess 13d, the distance KA less. The distance KA is the height in a direction perpendicular to the top wall 13 of the curved portion at the boundary between the side walls 11, 12 and the top wall 13. With respect to the direction perpendicular load to the top wall 13, a curved portion at the boundary between the side walls 11 and 12 and top wall 13 is easy to collapse, the portion other than the curved portion of the side wall 11, 12 has a high yield strength. For example, in a configuration without the reinforcement member 4, when an impact is input to the top wall 13, collapses the curved portion, the portion of the R boundary wall 11, 12 to the second ridge 124, becomes a structure to withstand shock Cheap. In the configuration shown in FIG. 12K, the distance between the recesses 13d of the reinforcing member 4 and the top wall 13 a distance KA i.e. by the following height of the curved portion, it is possible to suppress the deformation of the curved portion during the impact input. Thus, inside the closed cross section member, by providing the reinforcing member 4 so as to be adjacent to the concave portion of the top wall 13, the rigidity of the structural member against the impact of the top wall 13 is improved.
[0144]
　Application Example of the vehicle]
　As described above, attached to the structural member 10 is used as a structural member for a vehicle, the structural member 10, to the vehicle in two while supporting a connecting portion of the longitudinally spaced tubular portion Sometimes. Structural member 10, for example, the vehicle body is used as a structural member of a bumper or vehicle door. Therefore, the vehicle body comprising a structural member 10, also a bumper or vehicle door, are included in embodiments of the present invention.
[0145]
　In the side wall 11 of the support structure member 10 by two connecting portions, between the two connecting portions, and two low-strength portion 11B spaced longitudinally, during which the high-strength portion 11A is disposed. Similarly on the other side wall 12 facing the side walls 11 and 12, the high strength portion 12A and the low-strength portion 12B is disposed. This makes it possible to in the structural member 10, hardly broken portions moment when a shock is applied increases. As a result, impact resistance is high structural member obtained.
[0146]
　In particular the central portion of the member moment tends to increase when the impact is applied. Therefore, the high strength portion 11A into two equal distance portion from the connecting portion of the (center between the two connecting portions), it is desirable to place the 12A. Further, it is preferable to adopt a configuration to support high-strength portion 11A in the longitudinal center of the tubular portion, the both end portions of the structural member 10 12A is disposed. Here, the structure for supporting the both end portions, in addition to the mode of supporting both ends of the structural members 10, and also includes embodiments for supporting the portion in the vicinity of both ends of the structural member 10.
[0147]
　When mounting the structural member 10 to the vehicle, it is often tubular the longitudinal direction of the structural member 10 is to place the structural member 10 so that along the contour of the vehicle. That is, as the impact in the case of a vehicle collision is perpendicular to the longitudinal direction of the structural member 10, often structural member 10 is attached to the vehicle. Further, on the outer top wall 13 of the vehicle, so that the closing plate 2 is positioned inside of the vehicle, there is the structural member 10 is attached to the vehicle. In this case, the high strength portion 11A is disposed in the center between the connecting portion of the structural member 10, the low-strength portion 11B are disposed on both sides thereof. Thus, in the event of an impact from the outside of the vehicle to the structural member 10, the degree of structural member 10 protrudes into the inside of the vehicle is reduced. Sometimes reverse the closing plate 2 is disposed on the outside of the vehicle. Again, the high strength portion 11A is disposed in the center between the connecting portion of the structural member 10, the low-strength portion 11B are disposed on both sides thereof. Sometimes closing plate 2 is disposed on the outside of the vehicle, in the event of an impact from the outside of the vehicle to the structural member 10, the degree of structural member 10 protrudes into the inside of the vehicle is reduced.
[0148]
　Structural members 10, as described above, may be curved. In this case, the structural member 10 is mounted to the vehicle so as to be convex toward the outside of the vehicle. Thus, in the event of an impact from the outside of the vehicle, it can be more difficult to break the structural member 10.
[0149]
　Structural member 10 may be a structural member constituting the vehicle body, a part of the bumper or the vehicle door. For example, it is possible to use A-pillar, B-pillar, side sill, locker, roof rail, the structural member 10 to the members constituting the vehicle body such as floor members, a front side member. Alternatively, it attached to the body such as door impact beams or bumper reinforcement, it is also possible to use a structural member 10 from an impact from the outside member to protect the equipment and passenger in the vehicle.
[0150]
　Figure 13 is a diagram showing an example of the structure member disposed on the vehicle of monocoque construction. In the example shown in FIG. 13, A-pillar 15, B-pillar 16, the rocker 17, roof rail 18, the bumper reinforcement 19, a front side member 20, the door impact beam 21, the floor members 22, and the structural member for the rear side member 23 in the vehicle used as. At least one of these vehicle structural member may be constructed in a structure member 10 described above.
[0151]
　Figure 14 is a diagram showing a configuration example of the application of the structural member 10 to the bumper reinforcement 19. Pampa 14 - reinforcement 19 is constituted by a structural member 10 described above. The side wall 11 of the structural member 10, the high strength portion 11A and the low-strength portion 11B are aligned in the longitudinal direction. When applying the structural member 10 to the bumper reinforcement 19, consisting of two end portions of the structural member 10 to the structure for supporting the front side member 20. It is also possible to provide the crash box between the bumper reinforcement 19 and the front side member 20. In this case, both end portions of the structural member 10 is configured to be supported by the crash boxes.

WE claims

A structural member,
　and at least one closing plate, a closed cross-section structural member having a hat member,
　and a reinforcing member attached to the closed section structural member,
　said hat member,
　　and top wall,
　　said top two first ridgeline on the both ends of the surface portion,
　　and two flanges, each being joined to the closing plate,
　　and two second edges at the ends of the two flanges,
　　the two first ridge and respectively positioned between the two second edges of said the height in a direction perpendicular to the top surface portion H1, respectively H2, having two side walls, the,
　each of said two side walls includes a high-strength portion of the yield strength of more than 500 MPa, the high intensity part and are arranged adjacent in the extending direction of the first ridge, a yield strength of from 60 to 85% of the yield strength of the high strength portion with And a strength portion,
　the reinforcing member is provided adjacent to at least a portion of said top wall of said hat member, in the extending direction of the first ridge line, both ends of the reinforcing member, the side walls the high strength portion and overlap, 1/3 to 3/2 times the direction from at least one end of both ends of the reinforcing member in a direction away from the reinforcing member in the extending direction of the first ridge line H1 of wherein said high-strength portion in overlapping range of the spaced-apart regions with the H2 of 1/3 to 3/2-fold spaced area boundary of the low intensity portion is disposed, the structural member.
[Requested item 2]
　A structural member,
　and at least one closing plate, a closed cross-section structural member having a hat member,
　and a reinforcing member attached to the closed section structural member,
　said hat member,
　　and top wall,
　　said top two first ridgeline on the both ends of the surface portion,
　　and two flanges, each being joined to the closing plate,
　　and two second edges at the ends of the two flanges,
　　the two first ridge and respectively positioned between the two second edges of said closing plate in a height H1, respectively H2 in the vertical direction, has two side walls, the,
　each of said two side walls has a high strength portion yield strength is more than 500 MPa, is disposed adjacent the said high-strength portion of the first extending direction of the ridge line, descending from 60 to 85% of the yield strength of the high strength portion And a low strength portion having a strength,
　the reinforcement member is at least partially or provided adjacent to at least a portion of the two side walls of the hat member, extending in the first ridgeline of the closing plate in extending direction, and both ends of the reinforcing member overlaps with the high-strength portion of the side wall, in a direction away from the reinforcing member from at least one end of both ends of the reinforcing member in the extending direction of the first ridge line toward the high-strength portion and a boundary of the low-strength portion in the overlapping range between 1/3 to 3/2 times the spaced region and the H2 1/3 to 3/2-fold spaced-apart regions of the H1 and is arranged It is the structural member.
[Requested item 3]
　A structural member,
　and at least one closing plate, a closed cross-section structural member having a channel-shaped member,
　and a reinforcing member attached to the closed section structural member,
　said channel member includes
　　a top wall,
　　two first ridgeline on the both ends of the top wall,
　　and two junctions each of which is joined to the closing plate,
　　between said two first edges and said two junctions, respectively position and has, and two side walls height are each H1, H2 in a direction perpendicular to said top wall,
　each of said two side walls, and a high-strength portion yield strength is more than 500 MPa, the high is disposed adjacent the strength portion to the extending direction of the first ridge, and a low strength portion having a yield strength of from 60 to 85% of the yield strength of the high strength portion,
　the reinforcing member, the said top surface of the hat member At least a portion disposed adjacent said at extending direction of the first ridge line, both ends of the reinforcing member overlaps with the high-strength portion of the side wall, at least one end of both ends of the reinforcing member of said first ridge extending direction to the direction extending away from the reinforcement member spaced 1/3 ~ 3/2 times the 1/3 the 1-3 / 2 times spaced-apart regions with H2 of the H1 region from wherein said high-strength portion in overlapping range of the boundary of the low-strength portion is disposed, the structural member.
[Requested item 4]
　A structural member,
　and at least one closing plate, a closed cross-section structural member having a channel-shaped member,
　and a reinforcing member attached to the closed section structural member,
　said channel member has
　　one top wall When,
　　two first ridgeline on the both ends of the top wall,
　　a flange joined to the closing plate,
　　and one second ridge on the edge portion of the flange,
　　the first ridge and the located between the second edges, said first side wall height in the vertical direction is H1 to said top wall,
　　and a joint portion which is joined to the closing plate,
　　the bonding between the first ridgeline located between the parts, and a second side wall height is H2 in a direction perpendicular to said top wall,
　said first respective sidewalls and the second sidewalls of the yield strength and more high-strength portion 500 MPa, the high Is disposed adjacent the strength portion to the extending direction of the first ridge, and a low strength portion having a yield strength of from 60 to 85% of the yield strength of the high strength portion,
　Said reinforcing member, said at least a portion of the top wall of the hat member provided adjacent, in the extending direction of the first ridge line, both ends of the reinforcing member, the first side wall and the second overlapped with the high strength portion of the side wall of, 1/3 ~ of the direction from at least one end of both ends of the reinforcing member in a direction away from the reinforcing member in the extending direction of the first ridge line H1 3/2 the doubled spaced area and the said high intensity portion in overlapping range of 1/3 to 3/2-fold spaced-apart regions of H2 boundary of the low intensity portion is disposed, the structural member.
[Requested item 5]
　The dimensions of the low-strength portion in the extending direction of the first ridge, and 3/5 times the H1, is 3/5 times the H2, according to any one of claims 1 to 4, structural members.
[Requested item 6]
　In the extending direction of the first edge line, the low-strength portion is disposed on both sides of the high-strength portion, structural member according to any one of claims 1 to 5.
[Requested item 7]
　The reinforcing member, the are arranged in the center in the extending direction of the first ridge of the closed section structural member, the structural member according to any one of claims 1 to 6.
[Requested item 8]
　Between the opposite side of the other end with the first one end and the first edge line of the ridge line side of the side wall, toward the other end from the one end of the side wall, the said one end of said side wall in the region between the to 1/4 position of the length between the other end, wherein there is an end portion of the one end side of the low-strength portion,
　toward the said other end from the one end of the low-strength portion length is 1/5 or more the length of between the one end and the other end of said side wall,
　between said one end of the said one end side of the end portion of the low-strength portion and the side wall yield strength of the side wall is higher than and the low-strength portion than 500 MPa, structural member according to any one of claims 1, 3 and 4.
[Requested item 9]
　Between the other end of the one end and the first edge line side opposite the first ridgeline side of the side wall, toward the other end from the one end of said side wall, said one end of said side wall in the region between the to 1/4 position of the length between the other end, wherein there is an end portion of the one end side of the low-strength portion,
　toward the other end from the one end of the low-strength portion the length of the direction is 1/5 or more the length of between the one end and the other end of said side wall,
　between the one end of the said one end side of the end portion of the low-strength portion and the side wall the yield strength of the side wall of higher than or more and the low-strength portion 500 MPa, structural member according to claim 2.
[Requested item 10]
　Structural member according to any one of the top wall claim curved to be convex side 1, 3, 4, and 8.
[Requested item 11]
　Structural member according to claim 2 or 10 is curved to be convex on the closing plate side.
[Requested item 12]
　Wherein in a first extending direction in a plane perpendicular cross-section of the ridge, at least a portion of a virtual line segment which the closing plate connecting part which is joined to the hat member and the channel member, the said top wall It is between closing plate a structure according to any one of claims 1 to 11.
[Requested item 13]
　A vehicle body structure comprising a structural member according to any one of claims 1 to 12,
　wherein the reinforcing member is a center pillar,
　the closed section structural member is a rocker or a roof rail, a vehicle body structure.
[Requested item 14]
　Bumper reinforcement formed by structural member according to any one of claims 1 to 12.