[0001]The present invention relates to a vehicle skeleton member including a reinforcing member.
Background technology
[0002]For example, impact resistance is required for vehicle skeleton members such as B-pillars and side sills. For example, Japanese Patent Application Laid-Open No. 2011-37291 (Patent Document 1) discloses a front pillar structure. In this front pillar structure, a front pillar lower having an open cross-section structure opened inward in the vehicle width direction is formed by joining the front pillar outer portion having a cross-sectional hat shape and the pillar reinforcement lower. The front wall and flange of the pillar reinforcement lower are plate parts with higher strength than other parts.
[0003]
　Further, Japanese Patent Application Laid-Open No. 2014-73769 (Patent Document 2) discloses a vehicle body structure. In this vehicle body structure, the edge portion of the center pillar inner panel, the edge portion of the center pillar outer reinforcement, and the edge portion of the side outer panel are overlapped and joined by spot welding. The center pillar outer reinforcement is made of high-strength steel plate. At the edge portion of the center pillar outer reinforcement, a corrugated shape portion formed in a corrugated manner along the longitudinal direction of the edge edge is provided between the spot welded portions. The corrugated shape portion can extend in the longitudinal direction of the edge when the edge portion is deformed in the pulling direction along the longitudinal direction of the edge.
Prior art literature
Patent documents
[0004]
Patent Document 1: Japanese Patent Application Laid-Open No. 2011-372991
Patent Document 2: Japanese Patent Application Laid-Open No. 2014-73769
Outline of the invention
Problems to be solved by the invention
[0005]
　The inventors examined a configuration in which a vehicle skeleton member provided with a hat member and a closing plate is reinforced with a groove-shaped reinforcing member. The reinforcing member is preferably lightweight. It was found that when the reinforcing member is made of a high-strength material for efficient reinforcement, the joint portion between the reinforcing member and the hat member tends to be the starting point of fracture.
[0006]
　The present application discloses a vehicle skeleton member capable of efficiently exerting a reinforcing effect in a structure to which a high-strength reinforcing member is added.
Means to solve problems
[0007]
　The vehicle skeleton member according to the embodiment of the present invention includes a hat member, a closing plate, a reinforcing member, and a plurality of welded portions. The hat member includes a first top plate, two first vertical walls, and two flanges. The first top plate is arranged between the two first vertical walls. The first vertical wall is arranged between the top plate and the flange. The flange is joined to the closing plate. The reinforcing member includes a second top plate and two second vertical walls. The second top plate is arranged between the two second vertical walls. The first vertical wall and the second vertical wall are overlapped with each other. The plurality of welds join the first vertical wall and the second vertical wall. The plurality of welded portions that join the first vertical wall and the second vertical wall are located on the closing plate side of the intermediate surface between the first top plate and the closing plate in the first vertical wall. The tensile strength of the second vertical wall is larger than the tensile strength of the first vertical wall. The end of the second vertical wall on the opposite side of the second top plate is the end of the reinforcing member. There is an end portion of the reinforcing member between the plurality of welded portions.
The invention's effect
[0008]
　According to the disclosure of the present application, it is possible to provide a vehicle skeleton member capable of efficiently exerting a reinforcing effect in a structure to which a high-strength reinforcing member is added.
A brief description of the drawing
[0009]
FIG. 1A is a perspective view showing a configuration of a structural member in the present embodiment.
FIG. 1B is a side view of the structural member shown in FIG. 1A as viewed from the y direction.
FIG. 1C is a front view of the structural member shown in FIG. 1A as viewed from the x direction.
[Fig. 2] Fig. 2 is a diagram showing an example of arrangement of discontinuous portions.
[Fig. 3] Fig. 3 is a diagram showing an example of arrangement of discontinuous portions.
[Fig. 4] Fig. 4 is a diagram showing an example of arrangement of discontinuous portions.
[Fig. 5] Fig. 5 is a diagram showing a modified example of a discontinuous portion.
[Fig. 6] Fig. 6 is a diagram showing a modified example of a discontinuous portion.
[Fig. 7] Fig. 7 is a diagram showing a modified example of a discontinuous portion.
[Fig. 8] Fig. 8 is a diagram showing a modified example of a discontinuous portion.
[Fig. 9] Fig. 9 is a diagram showing a modified example of a discontinuous portion.
[Fig. 10] Fig. 10 is a diagram showing a modified example of a discontinuous portion.
FIG. 11 is a cross-sectional view showing a modified example of the cross-sectional shape of a structural member.
Embodiment for carrying out the invention
[0010]
　The inventors have studied a configuration in which a groove-shaped reinforcing member is added to a closed cross-sectional structure in which a hat member and a closing plate are joined to reinforce the vehicle skeleton member. The reinforcing member is preferably lightweight. Therefore, we tried to use a high-strength material with higher strength than the hat member for the reinforcing member. Furthermore, we examined the efficient placement of reinforcing members made of high-strength materials. As a result, we came up with a configuration in which the vertical wall of the hat member and the reinforcing member are joined at a portion closer to the closing plate than the intermediate surface between the joint portion between the hat member and the closing plate and the top plate of the hat member. With this configuration, there is a possibility that a reinforcing effect can be efficiently obtained. In order to efficiently absorb energy when bending and crushing the vehicle skeleton member, it is necessary to plastically deform the vertical wall of the hat member to work. By arranging the reinforcing member closer to the closing plate than the middle of the height of the vertical wall of the hat member and joining it to the vertical wall, it is possible to induce plastic deformation of the vertical wall and efficiently absorb energy. .. Here, by making the strength of the reinforcing member stronger than the strength of the vertical wall of the hat member, energy absorption can be made more efficiently.
[0011]
　However, in the above configuration, it has been found that when an impact is applied to the top plate of the hat member, breakage is likely to occur starting from the welded portion that joins the hat member and the reinforcing member. When the joint between the reinforcing member having high strength and the hat member is welded, the periphery of the welded portion of the reinforcing member may be softened. The softened zone is called a HAZ softened zone.
[0012]
　When a hat member to which such a high-strength material is added as a reinforcing member is applied to a car body frame part, strain is concentrated on the HAZ softened portion of the welded portion between the reinforcing member and the hat member at the time of a collision of the automobile, and this HAZ softening occurs. Breakage may occur starting from the portion. More specifically, by making the reinforcing member stronger than the hat member, HAZ softening is likely to occur in the reinforcing member.
[0013]
　The inventors investigated the mechanism of fracture starting from the joint between the reinforcing member and the hat member. As a result, when the welded portion that joins the reinforcing member and the hat member is on the tensile side from the neutral surface, a tensile force in the longitudinal direction of the hat member is applied to the welded portion, and fracture starting from the HAZ softened portion occurs. I found that it is more likely to occur. That is, by arranging the welded portion closer to the closing plate than the middle of the height of the vertical wall of the hat member to improve the energy absorption efficiency at the time of bending deformation, the tensile force in the longitudinal direction of the hat member is applied to the welded portion. Is likely to occur. Therefore, strain concentration occurs on the HAZ softened zone due to the tensile force, and fracture starting from the HAZ softened zone is likely to occur.
[0014]
　Based on this finding, the inventors have set up a plurality of welds for joining the hat member and the reinforcing member at a position closer to the closing plate than the middle of the height of the vertical wall of the hat member. I came up with the idea of ​​providing notches and holes for reinforcing members between the parts. That is, I came up with a configuration in which the end portion of the reinforcing member is arranged between the welded portions. As a result, even when a tensile force in the longitudinal direction of the hat member is applied between the adjacent joint portions, the tensile force is relaxed by the end portion of the reinforcing member between the adjacent joint portions. With this configuration, strain concentration on the HAZ softened zone can be suppressed when a tensile force is applied between the plurality of welded portions. Therefore, it is possible to suppress breakage starting from the HAZ softened portion. As a result, the reinforcing effect of the reinforcing member can be efficiently exhibited.
[0015]
　(Structure 1)
　The vehicle skeleton member according to the embodiment of the present invention includes a hat member, a closing plate, a reinforcing member, and a plurality of welded portions. The hat member includes a first top plate, two first vertical walls, and two flanges. The first top plate is arranged between the two first vertical walls. The first vertical wall is arranged between the top plate and the flange. The flange is joined to the closing plate. The reinforcing member includes a second top plate and two second vertical walls. The second top plate is arranged between the two second vertical walls. The first vertical wall and the second vertical wall are overlapped with each other. The plurality of welds join the first vertical wall and the second vertical wall. The plurality of welded portions that join the first vertical wall and the second vertical wall are located on the closing plate side of the intermediate surface between the first top plate and the closing plate in the first vertical wall. The tensile strength of the second vertical wall is larger than the tensile strength of the first vertical wall. The end of the second vertical wall on the opposite side of the second top plate is the end of the reinforcing member. There is an end portion of the reinforcing member between the plurality of welded portions.
[0016]
　According to the above configuration, the plurality of welds for joining the hat member and the reinforcing member are on the closing plate side from the intermediate surface between the first top plate of the hat member and the closing plate. The second vertical wall of the reinforcing member has higher strength than the first vertical wall of the hat member. As a result, when the vehicle skeleton member is deformed by receiving a force perpendicular to the first top plate from the outside of the first top plate, the reinforcing member is deformed together with the hat member. At that time, the reinforcing member increases the resistance to deformation. In this way, the hat member and the reinforcing member induce plastic deformation of the vertical wall while withstanding the load. Therefore, the vehicle skeleton member can efficiently absorb energy at the time of bending and crushing deformation. Further, when the vehicle skeleton member is deformed by receiving a force perpendicular to the first top plate, a tensile force in the longitudinal direction of the hat member is generated between the plurality of welded portions. By making the strength of the reinforcing member higher than the strength of the hat member, a HAZ softened portion is likely to occur around the welded portion. When strain due to tensile force is concentrated on the HAZ softened zone, fracture occurs starting from the HAZ softened zone. However, in the above configuration, there is an end of the reinforcing member between the plurality of welds. That is, the welded portions of the reinforcing member are cut. The end of the reinforcing member may be, for example, the edge of a notch or hole in the reinforcing member. Thereby, the tensile force acting between the plurality of welded portions can be relaxed. Therefore, it is possible to prevent breakage starting from the welded portion when the vehicle skeleton member is deformed. Further, the end portion of the reinforcing member between the welded portions is the end portion on the side opposite to the second top plate of the second vertical wall. As a result, between the welds, a second vertical wall extends from the second top plate to the region between the welds. Therefore, the area covered by the reinforcing member becomes smaller than in the case where the second vertical wall extends from the second top plate to the flange. That is, efficient energy absorption can be realized with a small number of reinforcing members. As a result, the reinforcing effect of the reinforcing member can be efficiently exhibited.
[0017]
　In the above configuration 1, the first top plate and the second top plate may be overlapped with each other. This makes it possible to further enhance the reinforcing effect of the reinforcing member. In this case, a welded portion for joining the first top plate and the second top plate may be provided. This makes it possible to further enhance the reinforcing effect of the reinforcing member. In the state where the two members are overlapped with each other, the two members are in contact with each other at least in a part.
[0018]
　(Structure 2) In the
　above configuration 1, it is preferable that the end portion of the reinforcing member crosses a region between adjacent welded portions. This makes it easier to obtain the effect of relaxing the tensile force acting on the heat-affected zone (HAZ softened zone). The adjacent welded portions are at least a pair of adjacent welded portions among the plurality of welded portions. If the ends of the reinforcing member do not cross the area between the adjacent welds, the position of the end of the reinforcing member closest to the first top plate is within the area between the adjacent welds. When the reinforcing member crosses the region, the longitudinal tensile force of the hat member between the adjacent welds is relaxed as compared to the case where the end of the reinforcing member does not cross the region between the adjacent welds. The effect is significantly improved.
[0019]
　The second top plate may be on the first top plate side from the intermediate surface between the first top plate and the closing plate on the first vertical wall. As a result, the second vertical wall is arranged from a position closer to the first top plate than the intermediate surface to a position closer to the closing plate than the intermediate surface. Therefore, the effect of reinforcing the first vertical wall by the reinforcing member is improved. As a result, the vehicle skeleton member can more efficiently absorb energy during bending crush deformation.
[0020]
　(Structure 3) In the
　configuration 2, the end portion of the reinforcing member crosses a region between adjacent welded portions, and is further intermediate between the first top plate and the closing plate on the first vertical wall. It is preferable that the surface extends closer to the first top plate. That is, the end portion of the reinforcing member may reach the region closer to the first top plate than the intermediate surface from the region between the welded portions. When the structural member is deformed by receiving a force perpendicular to the first top plate from the outside of the first top plate, the position of the intermediate surface of the first vertical wall is close to the neutral axis, so that the tensile force in the longitudinal direction of the hat member Becomes smaller. The tensile force increases as it approaches the closing plate from the intermediate surface. By forming the end portion of the reinforcing member extending from the intermediate surface toward the first top plate, the end portion of the reinforcing member is arranged so as to cover a region where a tensile force at the time of deformation can be generated. This makes it possible to further enhance the effect of relaxing the tensile force acting between the plurality of welded portions.
[0021]
　The end portion of the reinforcing member extends from the intermediate surface between the first top plate and the closing plate on the first vertical wall to a position closer to the first top plate between the adjacent welded portions. It may not reach the second top plate. That is, the end portion of the reinforcing member may be configured so as not to reach the ridgeline between the second top plate and the second vertical wall between the adjacent welded portions. Further, in other words, the end portion of the reinforcing member may be configured to be located in both the region between the adjacent welded portions and the region between the intermediate surface and the second top plate. As a result, it is possible to enhance the effect of relaxing the tensile force between the welded portions while ensuring the reinforcing effect of the ridge line between the second top plate and the second vertical wall of the reinforcing member.
[0022]
　In this configuration, the distance HT between the position closest to the second top plate at the end of the reinforcing member and the intermediate surface is preferably (2/3) h or less (HT ≦ (2/3) h). .. Here, h is the distance h between the second top plate and the intermediate surface. As a result, it is possible to more reliably secure the reinforcing effect of the ridge line between the second top plate and the second vertical wall of the reinforcing member, and enhance the relaxing effect of the tensile force between the welded portions. When the ridgeline between the second top plate and the second vertical wall has an R shape (roundness), the distance between the end of the R shape on the second vertical wall side and the intermediate surface is defined as the above distance h.
[0023]
　The line of intersection between the intermediate surface between the first top plate and the closing plate and the outer surface of the first vertical wall is defined as the intermediate line. The middle line of the first vertical wall is the height in the direction perpendicular to the surface of the flange from the end on the first top plate side to the end on the flange side of the first vertical wall in the cross section perpendicular to the longitudinal direction of the hat member. The position is in the middle (1/2). The position of the first vertical wall on the closing plate side from the intermediate surface is a position closer to the closing plate than the intermediate line on the first vertical wall. The position of the first vertical wall on the first top plate side from the intermediate surface is a position closer to the first top plate 1 than the intermediate line on the first vertical wall. When the cross-sectional shape of the ridgeline between the first top plate and the first vertical wall has an R shape (roundness), the end of the first vertical wall on the first top plate side when determining the intermediate line is the R of the ridgeline. It is the end of the shape on the first top plate side. When the cross-sectional shape of the ridge line between the first vertical wall and the flange has an R shape (roundness), the end on the flange side of the first vertical wall is the end on the flange side of the R shape.
[0024]
　The hat member and the reinforcing member may be curved in the longitudinal direction. In this case, at least one of the ridgeline between the first top plate and the first vertical wall of the hat member and the ridgeline between the first vertical wall and the flange is curved and extends. The ridgeline between the first top plate and the first vertical wall of the hat member and the ridgeline between the first vertical wall and the flange may or may not be parallel.
[0025]
　The first top plate and the first vertical wall of the hat member may be formed of a flat plate, or may have a shape in which a part of the flat plate has irregularities. The second top plate and the second vertical wall of the reinforcing member may be formed of a flat plate, or may have a shape in which a part of the flat plate has irregularities. The first top plate of the hat member and the flange may or may not be parallel.
[0026]
　(Structure 4) In
　any of the configurations 1 to 3, the first vertical wall may be formed so that the end portion of the first vertical wall is not arranged between the adjacent welded portions. The end portion of the reinforcing member may overlap with the first vertical wall between the adjacent welded portions. In this case, the first vertical wall of the hat member is seamlessly and continuously arranged throughout the region between adjacent welds. As a result, the first vertical wall of the hat member, which has a lower strength than the reinforcing member, can appropriately strengthen the function of withstanding the deformation due to the tensile force between the welded portions. The second vertical wall of the reinforcing member can be deformed while being able to withstand more bending deformation as a whole while relaxing the tensile force between the welded portions. By deforming the first vertical wall of these hat members and the second vertical wall of the reinforcing member in cooperation with each other while enduring, more efficient energy absorption becomes possible.
[0027]
　(Structure 5) In
　any of the above configurations 1 to 4, the end portion of the reinforcing member passing between the plurality of welded portions does not reach the ridgeline between the second top plate and the second vertical wall. Is preferable. By making the end portion of the reinforcing member not divide the ridgeline, the strength of the reinforcing member can be increased as compared with the case where the end portion of the reinforcing member reaches the ridgeline. When the ridgeline between the second top plate and the second vertical wall has an R shape (roundness), that is, the corner portion between the second top plate and the second vertical wall. When the outer surface has a curved surface, the end of the R-shaped (rounded) portion on the second vertical wall side is set as the position of the ridgeline.
[0028]
　(Structure 6) In
　any of the above 1 to 5, the tensile strength of the second vertical wall may be 1100 MPa or more. Further, from the viewpoint of further improving the reinforcing effect, the tensile strength of the second vertical wall is preferably 1180 MPa or more.
[0029]
　(Structure 7) In
　any of the above configurations 1 to 6, the tensile strength of the first vertical wall is preferably 980 MPa or less. As a result, it is possible to suppress the occurrence of breakage starting from the HAZ softened portion in the welded portion on the first vertical wall of the hat member. From the same viewpoint, the tensile strength of the first vertical wall of the hat member may be less than 1100 MPa. From the viewpoint of increasing the resistance to deformation, it is preferable that the strength of the first vertical wall is high. For example, the tensile strength of the first vertical wall may be 1100 MPa or more. There is no particular upper limit to the tensile strength of the first vertical wall, but for example, the tensile strength of the first vertical wall may be less than 1180 MPa.
[0030]
　(Structure 8)
　A vehicle skeleton including any of the vehicle skeleton members of the above configurations 1 to 7 is also one of the embodiments of the present invention. In the vehicle skeleton, the first top plate surface may be arranged on the outside of the vehicle, and the closing plate may be arranged on the inside of the vehicle. Thereby, it is possible to form a vehicle skeleton having impact resistance against an impact from the outside of the vehicle.
[0031]
　The reinforcing member may be arranged outside the closed cross-sectional structure formed by the hat member and the closing plate. Alternatively, the reinforcing member may be placed inside the closed cross-section structure, i.e., between the hat member and the closing plate.
[0032]
　[Embodiment]
　FIG. 1A is a perspective view showing the configuration of the structural member 10 in the present embodiment. FIG. 1B is a side view of the structural member 10 shown in FIG. 1A as viewed from a direction (y direction) perpendicular to the longitudinal direction and the height direction. FIG. 1C is a front view of the structural member 10 shown in FIG. 1A as viewed from the longitudinal direction.
[0033]
　The structural member 10 includes a hat member 1, a closing plate 2, and a reinforcing member 6. The hat member 1 has a hat-shaped cross section. A part of the hat member 1 and a part of the closing plate 2 are overlapped with each other and joined. The hat member 1 and the closing plate 2 are joined to each other to form a closed cross-sectional structure. A part of the reinforcing member 6 and a part of the hat member 1 are joined to each other.
[0034]
　As shown in FIG. 1A, the hat member 1 has a first top plate 1a, two first vertical walls 1b, and two flanges 1c. The two first vertical walls 1b extend from both ends of the first top plate 1a and face each other. The two flanges 1c extend in each of the two first vertical walls 1b in a direction away from the other end on the side opposite to the one on the first top plate 1a side of the first vertical wall 1b. That is, the two flanges 1c extend outward from the other end of the two first vertical walls 1b in the opposite direction of the two first vertical walls 1b. The two flanges 1c and the closing plate 2 are overlapped and joined. The closing plate 2 and the two flanges 1c are joined by a plurality of welded portions 33. The welded portion 33 is, for example, a welded portion of spot welding.
[0035]
　The boundary portion (shoulder portion) between the first top plate 1a and the two first vertical walls 1b is a bent portion of the hat member 1. This bent portion forms a ridge line extending in the longitudinal direction (x direction) of the structural member 10. The boundary portion between each of the two first vertical walls 1b and each flange 1c is a bent portion of the hat member 1. This bent portion also forms a ridge line extending in the x direction.
[0036]
　The reinforcing member 6 is a groove-shaped member including a second top plate 6a and two second vertical walls 6b. Two second vertical walls 6b extend from both ends of the second top plate 6a. That is, the second top plate 6a is arranged between the two second vertical walls 6b. The two second vertical walls 6b face each other. The second top plate 6a is overlapped with the first top plate 1a of the hat member 1. The second top plate 6a is joined to the first top plate 1a by a welded portion 32. The second vertical wall 6b is overlapped with the first vertical wall 1b. The second vertical wall 6b is joined to the first vertical wall 1b of the hat member 1 by a plurality of welded portions 31. The welded portions 31 and 32 are, for example, spot welded welded portions. The second vertical wall 6b of the reinforcing member has a higher tensile strength than the first vertical wall 1b of the hat member 1.
[0037]
　As shown in FIGS. 1B and 1C, the plurality of welded portions 31 for joining the first vertical wall 1b and the second vertical wall 6b are on the closing plate 2 side from the intermediate surface C1 between the first top plate 1a and the closing plate 2. It is in. The distance between the intermediate surface C1 and the first top plate 1a is equal to the distance between the intermediate surface C1 and the closing plate 2. In the present embodiment, the intermediate surface C1 substantially overlaps with the neutral axis when a load is applied in the direction perpendicular to the first top plate 1a. The neutral axis is a position where when a bending moment is generated in the member, the tensile force and the compressive force in the longitudinal direction of the member are balanced and the stress becomes zero. When a bending moment is generated in the member, the stress in the neutral axis becomes zero, the tensile force increases as the distance from the neutral axis increases toward the tension side, and the compressive force increases as the distance from the neutral axis increases toward the compression side. By arranging the welded portion 31 on the closing plate 2 side from the intermediate surface C1, a tensile force is generated between the welded portions 31 when an impact is applied to the first top plate 1a. In the example shown in FIG. 1C, the intermediate surface C1 is at a height of half (H / 2) of the height H of the first vertical wall 1b in the direction perpendicular to the first top plate 1a (the surface of the flange 1c). To position.
[0038]
　Further, since the welded portion 31 is located closer to the closing plate 2 than the intermediate surface C1, the hat member 1 and the reinforcing member 6 are deformed when the structural member 10 is deformed by a load in the direction perpendicular to the first top plate 1a. While withstanding the load, it becomes easy to induce plastic deformation of the vertical wall 1b. Further, since the tensile strength of the second vertical wall 6b is larger than the tensile strength of the first vertical wall 1b, the vertical wall 1b is deformed while withstanding a load to some extent. As a result, the structural member 10 can efficiently absorb energy when it is deformed by a load. Further, in the examples shown in FIGS. 1A to 1C, the reinforcing member 6 supports more than half of the vertical wall 1b in the height direction. As a result, the structural member 10 can absorb energy more efficiently when deformed.
[0039]
　In the example shown in FIGS. 1A to 1C, the second top plate 6a of the reinforcing member 6 is located closer to the first top plate 1a than the intermediate surface C1. That is, the reinforcing member 6 is provided so as to straddle the region near the neutral axis. As a result, the reinforcing effect of the first vertical wall 1b by the reinforcing member 6 is further enhanced. Further, when the structural member 10 is deformed, the ridges of the second top plate 6a and the second vertical wall 6b of the reinforcing member 6 are deformed while withstanding the compressive force. Therefore, it is possible to increase the energy absorption efficiency when the structural member 10 is deformed.
[0040]
　In the present embodiment, the tensile strength of the first vertical wall 1b of the hat member 1 is, for example, 980 MPa or less. The reinforcing member 6 is, for example, 1100 MPa or more. For example, the reinforcing member 6 may be formed of a steel plate containing a martensite structure. As the reinforcing member 6, a hot stamping material or an ultra-high-tensile material is used. The higher the strength of the member, the more likely it is that a HAZ softened portion softened by the influence of welding heat is formed around the welded portions 31, 32, 33. In the hat member 1 having a tensile strength of less than 1100 MPa, breakage starting from the HAZ softened portion is unlikely to occur. In the hat member 1 having a tensile strength of 980 MPa or less, fracture starting from the HAZ softened portion is more unlikely to occur. On the other hand, in the reinforcing member 6 having a tensile strength of 1100 MPa or more, breakage starting from the HAZ softened portion is likely to occur. In particular, when a tensile force is generated between the welded portions 31 of the second vertical wall 6b of the reinforcing member 6, breakage is likely to occur starting from the HAZ softened portion of the welded portion 31.
[0041]
　The range of strength of the hat member 1 (first vertical wall 1b) and the reinforcing member 6 (second vertical wall 6b) is not limited to the above example. For example, the tensile strength of the hat member 1 (first vertical wall 1b) may be less than 1100 MPa, and the tensile strength of the reinforcing member 6 (second vertical wall 6b) may be 1100 MPa or more. As a result, it is possible to increase the strength of the reinforcing member 6 and increase the proof stress against deformation, while making it difficult for the hat member 1 to generate the HAZ softened zone and reducing the risk of breakage starting from the HAZ softened zone. Further, in order to further increase the proof stress against deformation, for example, the tensile strength of the reinforcing member 6 (second vertical wall 6b) is set to 1180 MPa or more, and the tensile strength of the hat member 1 (first vertical wall 1b) is set to less than 1180 MPa. May be good. In these cases as well, it is possible to obtain the effects of improving the efficiency of energy absorption and relaxing the tensile force between the welded portions at the time of deformation.
[0042]
　There is an end portion 4 of the reinforcing member 6 between the plurality of welded portions 31 joining the second vertical wall 6b of the first vertical wall 1b. The end portion 4 of this reinforcing member is also an end portion of the second vertical wall 6b on the opposite side of the second top plate 6a. That is, the end portion 4 of the reinforcing member is the end portion of the second vertical wall 6b on the closing plate 2 side. In the examples shown in FIGS. 1A and 1B, the end portion 4 of the reinforcing member 6 is the edge of the notch of the reinforcing member 6. In other words, a portion where the reinforcing member 6 becomes a discontinuous portion, that is, an end portion 4 of the reinforcing member 6 is arranged between the adjacent welded portions 31. The reinforcing member 6 between the adjacent welded portions 31 is divided by the end portion 4.
[0043]
　The tensile force between the welded portions 31 generated when the structural member 10 is bent and deformed by the impact on the first top plate 1a is relaxed by the end portion 4 of the reinforcing member 6 between the welded portions 31. That is, the end portion 4 of the reinforcing member 6 between the welded portions 31 makes it difficult for the tensile force applied to the second vertical wall 6b of the reinforcing member 6 to be transmitted between the adjacent welded portions 31. For example, when the structural member 10 is bent and deformed by receiving an external force in the direction perpendicular to the first top plate 1a, a tensile force that pulls the reinforcing member 6 in the longitudinal direction acts between two adjacent welded portions 31. In this case, since the end portion 4 of the reinforcing member 6 is located between one welded portion 31 and the adjacent welded portion 31, the force applied to one welded portion 31 is difficult to be transmitted to the adjacent welded portion 31. Therefore, the reinforcing member 6 can be deformed without the two adjacent welded portions 31 being restrained from each other. As a result, strain concentration on the HAZ softened zone around the welded portion 31 is suppressed. As a result, breakage starting from the HAZ softened portion around the welded portion 31 is less likely to occur.
[0044]
　As a method of relaxing the tensile force between the welded portions, for example, the first vertical wall 1b and the second vertical wall 6b between the welded portions 31 are provided with a deflection, and when the tensile force is generated, the welded portion is generated. It is also conceivable to allow the first vertical wall 1b and the second vertical wall 6b between 31 to extend in the tensile direction. However, in this case, if the deflection is fully extended, a tensile force is applied to the welded portion 31 and the strain is concentrated. In this case, the effect of suppressing breakage of the welded portion 31 cannot be obtained. On the other hand, by arranging the end portion of the reinforcing member 6 between the welded portions 31 as in the present embodiment, it is possible to more reliably suppress the breakage of the welded portion 31.
[0045]
　In the example shown in FIGS. 1A and 1B, the first vertical wall 1b of the hat member 1 is formed so that the end portion of the first vertical wall 1b is not arranged between the adjacent welded portions 31. That is, the first vertical wall 1b between the adjacent welded portions 31 does not have a discontinuous portion such as a hole, a notch, or a notch. In this case, the first vertical wall 1b is formed entirely and continuously in the region between the adjacent welds 31. Further, between the adjacent welded portions 31, the end portion 4 of the reinforcing member 6 overlaps with the first vertical wall 1b.
[0046]
　As described above, in the region between the welded portions 31, the first vertical wall 1b of the hat member 1 having a lower strength than the reinforcing member 1 is continuously present, and the reinforcing member 6 having a higher strength is discontinuous. With this configuration, the first vertical wall 1b, which has a lower strength than the second vertical wall 6b of the reinforcing member 6, provides a force to withstand the tensile force generated between the welded portions 31 when the structural member is deformed. Can be generated. Therefore, it is possible to prevent an excessive load of tensile force between the welded portions 31 while generating an appropriate yield strength against deformation due to tension. On the other hand, for example, when the first vertical wall 1b and the second vertical wall 6b between the welded portions 31 are configured to have a deflection so as to be able to extend in the tensile direction, the deflection extends in the tensile direction. During this period, almost no tensile strength is generated. Therefore, in the configuration in which the end portion of the reinforcing member is arranged between the welded portions of the present embodiment, the resistance to deformation of the structural member as a whole becomes stronger than in the configuration in which the bending portion is provided between the welded portions.
[0047]
　The second vertical wall 6b has an end portion between the welded portions 31 on the closing plate 2 side of the intermediate surface C1 and has a portion discontinuous in the longitudinal direction (ridge line direction). On the other hand, on the side of the first top plate 1a from the intermediate surface C1, there is a portion where the second vertical wall 6b is continuous in the longitudinal direction (ridge line direction), that is, is integrally connected. That is, on the side of the first top plate 1a from the intermediate surface C1, there is a region where the second vertical wall 6b overlaps with the first vertical wall 1b over the entire longitudinal direction (ridge line direction). In this embodiment, as an example, the intermediate surface C1 overlaps the neutral axis. When the structural member 10 is deformed by a load perpendicular to the first top plate 1a, a compressive force is generated in the region closer to the first top plate 1a than the intermediate surface C1. A tensile force is generated in the region closer to the closing plate 2 than the intermediate surface C1. In the present embodiment, the reinforcing member 6 is continuously formed in the region where the compressive force is generated at the time of deformation, the reinforcing member 6 and the hat member 1 are joined in the region where the tensile force is generated, and the reinforcing member 6 is formed. Partially discontinuous. As a result, the structural member 10 can efficiently absorb energy when it is deformed by a load.
[0048]
　The end of the second vertical wall 6b, that is, the end of the reinforcing member 6, does not reach the flange 1c. As a result, on the closing plate 2 side from the intermediate surface C1, there is a region where the second vertical wall 6b does not overlap with the first vertical wall 1b over the entire longitudinal direction (ridge line direction). In this way, the amount of the reinforcing member 6 in the region where the tensile force increases when the first vertical wall 1b is deformed can be made smaller than the amount of the reinforcing member 6 in the region where the compressive force increases. As a result, the structural member 10 can efficiently absorb energy when it is deformed by a load. Further, the amount of the reinforcing member 6 can be reduced as compared with the case where the reinforcing member 6 is provided on the entire surface of the first vertical wall 1b. With a small number of reinforcing members 6, it is possible to improve energy absorption during deformation.
[0049]
　In the examples shown in FIGS. 1A and 1B, the reinforcing member 6 is arranged over the entire longitudinal direction of the hat member 1, but the reinforcing member 6 is arranged in a part of the hat member 1 in the longitudinal direction. May be good. For example, the reinforcing member 6 may be provided only in the portion of the entire longitudinal direction of the hat member 1 that is desired to be reinforced.
[0050]
　In the example shown in FIG. 1B, the end portion 4 of the reinforcing member 6 crosses the region between the adjacent welded portions 31, and further extends from the intermediate surface C1 to a position closer to the first top plate 1a. That is, the end portion 4 of the reinforcing member 6 is formed so as to reach a region closer to the closing plate 2 than the intermediate surface C1 to a region closer to the first top plate 1a than the intermediate surface C1. Since the vicinity of the intermediate surface C1 of the hat member 1 is close to the neutral axis, the tensile force at the time of deformation becomes small, and the tensile force increases as the distance from the intermediate surface C1 toward the closing plate 2 increases. By extending the end portion 4 from the intermediate surface C1 to a position closer to the first top plate 1a, the end portion 4 can be arranged so as to cover a region where a tensile force may be generated during deformation. As a result, the effect of suppressing fracture of the welded portion due to the stress concentration of tension can be further enhanced.
[0051]
　In the example shown in FIG. 1B, between the adjacent welded portions 31, the end portion 4 of the reinforcing member 6 is located in a region closer to the closing plate 2 than the intermediate surface C1 to a region closer to the first top plate 1a than the intermediate surface C1. It enters and extends again from the intermediate surface C1 so as to return to the region closer to the closing plate 2. As a result, the portion of the tip of the notch formed by the end portion 4 (the recess recessed toward the first top plate 1a) closest to the first top plate 1a is closer to the first top plate 1a than the intermediate surface C1. Located in the area. At a position closer to the first top plate 1a than the intermediate surface C1, the tensile force becomes smaller or a compressive force is generated at the time of bending deformation. Therefore, the tip of the notch is less likely to be the starting point of cracking. In this way, the end portion 4 of the reinforcing member 6 is arranged so as to straddle the intermediate surface C1, and the portion of the end portion 4 closest to the first top plate 1a is placed on the first top plate 1a from the intermediate surface C1. It can be placed in a close area. As a result, the tip end portion of the end portion 4 is less likely to be the starting point of cracking. As a result, the reinforcing member 6 can be made difficult to crack.
[0052]
　In the example shown in FIG. 1B, the end portion 4 of the reinforcing member 6 does not reach the second top plate 6a between the adjacent welded portions 31. That is, the end portion 4 of the reinforcing member 6 does not reach the ridgeline between the second top plate 6a and the second vertical wall 6b. The portion of the tip end portion of the end portion 4 of the reinforcing member 6 closest to the first top plate 1a is located between the intermediate surface C1 and the ridge line. The reinforcing member 6 contributes to the improvement of the strength of the structural member 10 as a whole against impact because the ridge line between the second top plate 6a and the second vertical wall 6b withstands the compressive force. Therefore, by configuring the end portion 4 so as not to reach the ridgeline, the reinforcing effect of the ridgeline can be ensured. By arranging the portion of the end portion 4 closest to the first top plate 1a between the intermediate surface C1 and the second top plate 6a, it is possible to enhance the relaxing effect of the tensile force while ensuring the reinforcing effect. ..
[0053]
　This embodiment is an example in which the neutral axis substantially overlaps with the intermediate surface C1. The neutral axis does not have to exactly coincide with the intermediate surface C1. Even when the neutral axis is slightly deviated from the intermediate surface C1, the effect of arranging the end portions of the reinforcing member 4 with respect to the intermediate surface C1 can be obtained. Even if the neutral axis is deviated from the intermediate surface C1, when the structural member 10 is deformed by a load perpendicular to the first top plate 1a, the first vertical wall 1b and the second vertical wall 6b start from the vicinity of the intermediate surface C1 to the first sky. This is because the tendency that the compressive force increases as the plate 1a approaches and the tensile force increases as the intermediate surface C1 approaches the closing plate 2 does not change. Further, in the first vertical wall 1b and the second vertical wall 6b, since the region near the intermediate surface C1 is close to the neutral axis, both the compressive force and the tensile force are small. Even when the neutral axis is slightly deviated from the intermediate surface C1, the end portion 4 of the reinforcing member 6 is extended from the intermediate surface C1 to a position closer to the first top plate 1a between the adjacent welded portions 31. The effect of forming is obtained.
[0054]
　
　FIGS. 2 to 4 are views showing a configuration example of the end portion 4 of the reinforcing member 6 between the welded portions. In the example shown in FIG. 2, the end portion 4 has a region sandwiched between adjacent welded portions 31 (region between adjacent welded portions 31) when viewed from the y direction (direction substantially perpendicular to the first vertical wall). Formed to cross. As a result, the effect of suppressing breakage starting from the HAZ softened portion around the welded portion 31 by the end portion 4 can be further enhanced. In FIG. 2, the region sandwiched between the adjacent welded portions 31 is a line connecting one ends of the adjacent welded portions 31 in the z direction and a line connecting the other ends of the adjacent welded portions 31 in the z direction. It is a region between L2 and L2.
[0055]
　In the example shown in FIG. 3, the upper end (the end closest to the second top plate 6a) 4a of the end portion 4 is arranged in the region sandwiched by the adjacent welded portions 31. In this way, even if the end portion 4 of the reinforcing member 6 does not cross the region sandwiched between the adjacent welded portions 31, the end portion 4 of the reinforcing member 6 may be arranged in a part of the region. Also in this case, the effect of suppressing breakage can be obtained from the HAZ softened portion around the welded portion 31 by the end portion 4 of the reinforcing member 6.
[0056]
　In the example shown in FIG. 4, the end portion 4 of the reinforcing member 6 is arranged so as to intersect the line LC connecting the centers of the adjacent welded portions 31. As a result, the effect of suppressing fracture starting from the HAZ softened portion around the welded portion 31 by the end portion 4 of the reinforcing member 6 can be further enhanced.
[0057]
　FIG. 5 is a diagram showing another configuration example of the end portion 4 of the reinforcing member 6. In the example shown in FIG. 5, the position closest to the second top plate 6a of the end portion 4 is in the region between the intermediate surface C1 and the second top plate 6a. In the example shown in FIG. 5, the distance HT between the position closest to the second top plate 6a of the end portion 4 of the reinforcing member and the intermediate surface C2 is (2/3) h. Here, h is the distance h between the second top plate 6a and the intermediate surface C1. As a result, the end portion 4 of the reinforcing member 6 is arranged at a certain distance from the second top plate 6a. By setting HT ≦ (2/3) h in this way, the reinforcing effect of the ridge line between the second top plate 6a and the second vertical wall 6b of the reinforcing member 6 is ensured. From this point of view, HT ≦ (1/2) h is more preferable, and HT ≦ (1/4) h is even more preferable.
[0058]
　In the examples shown in FIGS. 2 to 5, the end portion 4 is the edge of the notch. In this case, the shape of the notch is not limited to the shape having two right-angled angles as shown in FIGS. 2 to 5. For example, as shown in FIGS. 6 and 7, the shape of the edge of the notch may be a shape having no corners or a shape having corners having an R shape (roundness). As a result, the end portion 4 is less likely to be the starting point of cracking.
[0059]
　In the example shown in FIG. 6, the edge of the notch at the end 4 includes a concave curve toward the second top plate 6a. Specifically, the shape of the edge at the tip of the notch is a concave arc on the side of the second top plate 6a.
[0060]
　In the example shown in FIG. 7, the edge at the tip of the notch is composed of a straight line portion 4b and an R shape (roundness) at both ends thereof, and has a concave shape on the second top plate 6a side.
[0061]
　8 and 9 are modified examples of the end portion 4 of the reinforcing member 6 between the welded portions 31. In the examples shown in FIGS. 2 to 7, the edge of the notch (slit) of the second vertical wall 6b of the reinforcing member 6 forms the end portion 4. On the other hand, in the example shown in FIG. 8, the edge of the hole (through hole) of the second vertical wall 6b of the reinforcing member 6 forms the end portion 4. In the example shown in FIG. 9, the notch of the reinforcing member 6 forms the end portion 4. At the notch, the two opposing surfaces that have entered the inside of the second vertical wall 6b of the reinforcing member 6 are in contact with each other in a slidable state.
[0062]
　The end portion 4 formed by the through hole or the edge of the notch shown in FIG. 8 or FIG. 9 may also be arranged in a part of the region sandwiched by the adjacent welded portions 31, as in FIG. Further, the end portion 4 formed by the through hole or the edge of the notch may be arranged on the line LC connecting the centers of the adjacent welded portions 31 as in FIG.
[0063]
　The through hole shown in FIG. 8 is circular, but the shape of the through hole is not limited to this. For example, the dimension in the longitudinal direction (ridge line direction) of the through hole may be longer than the dimension in the direction perpendicular to the dimension. For example, as shown in FIG. 10, the edge of the through hole 4 may be formed by connecting two straight lines 4d extending in the longitudinal direction and the ends of the two straight lines and forming an outwardly convex curve 4e.
[0064]
　In the example shown in FIGS. 2 to 5, the end portion 4 between the welded portions 31 in the second vertical wall 6b of the reinforcing member 6 does not reach the ridgeline between the second vertical wall 6b and the second top plate 6a. That is, the end portion 4 between the welded portions 31 of the second vertical wall 6b is arranged at a position that does not reach the second top plate 6a. As a result, it is possible to prevent the bending rigidity of the reinforcing member 6 from being lowered by the end portion 4. In the examples shown in FIGS. 2, 3, 4, and 6, the end portion 4 of the reinforcing member 6 between the welded portions 31 in the second vertical wall 6b is the end portion on the opposite side to the second top plate 6a. It is continuous from.
[0065]
　In the structural member 10 of the present embodiment, when a vertical impact is applied to the first top plate 1a, a plurality of welded portions 31 that join the first vertical wall 1b of the hat member 1 and the second vertical wall 6b of the reinforcing member 6 A tensile force is generated between the two. The tensile force can be dispersed by arranging the end portion 4 of the reinforcing member 6 between the welded portions 31 of the second vertical wall 6b of the reinforcing member 6. As a result, strain concentration on the HAZ softened portion around the welded portion 31 is suppressed. As a result, breakage starting from the HAZ softened portion is suppressed.
[0066]
　
　FIG. 11 is a cross-sectional view showing a modification of the cross-sectional shape of the structural member. The cross-sectional shape of the structural member 10a shown in FIG. 1C is symmetrical with respect to the vertically bisected plane (the plane including the x-axis) of the closing plate 2. On the other hand, the structural member 10a shown in FIG. 11 is not symmetrical with respect to the perpendicular bisector of the closing plate 2. The hat member 1 of the structural member 10a shown in FIG. 11 has two first vertical walls 1b having different shapes. The two first vertical walls 1b have different angles with respect to the flange 1c and heights HR and HL in the z direction.
[0067]
　In the example shown in FIG. 11, one of the two first vertical walls 1b has a step. Further, of the two first vertical walls 1b, the other first vertical wall 1b has a curved shape so that the outer surface becomes a curved surface. Specifically, the outer surface of the portion of the other first vertical wall 1b extending from the first top plate 1a is a curved surface.
[0068]
　Although not shown, at least one surface of the first top plate 1a, the first vertical wall 1b, the flange 1c, and the closing plate 2 may be a curved surface instead of a flat surface. That is, at least one of the first top plate 1a, the first vertical wall 1b, the flange 1c, and the closing plate 2 may have a partially curved surface. Further, the surface of at least one of the first top plate 6a and the second vertical wall 6b of the reinforcing member 6 may be a curved surface instead of a flat surface. For example, at least a part of the surface of the second top plate 6a and the second vertical wall 6b may be curved.
[0069]
　In the example shown in FIG. 11, the closing plate 2 has a shape protruding in a direction away from the hat member 1. Specifically, the closing plate 2 includes two portions 2b that are overlapped with the flange 1c of the hat member 1 and a portion 2a between these two portions 2b. The portion 2a has a shape that protrudes in a direction away from the hat member 1. In this example, the cross-sectional shape of the closing plate 2 is a hat shape. This constitutes a so-called double hat-shaped structural member. In the configuration shown in FIG. 11, the portion 2a between the flange 1c of the closing plate 2 and the portion 2a to be overlapped may be formed of a flat plate without protruding.
[0070]
　The reinforcing member 6 is arranged between the hat member 1 and the closing plate 2. In the example shown in FIG. 1, the reinforcing member 6 is arranged outside the closed cross-sectional structure formed by the hat member 1 and the closing plate 2. On the other hand, in the example shown in FIG. 11, the reinforcing member 6 is arranged inside the closed cross-sectional structure. The outer surface of the second vertical wall 6b of the reinforcing member 6 is joined by the welded portion 31 in a state of being in contact with the inner surface of the first vertical wall 1b of the hat member 1. The welded portion 31 is located on the closing plate 2 side of the intermediate surface C1 between the first top plate 1a and the closing plate 2 in each of the two first vertical walls 1b.
[0071]
　In the example shown in FIG. 11, the second top plate 6a of the reinforcing member 6 is located closer to the first top plate 1a than the intermediate surface C1. In this case, the second vertical wall 6b of the reinforcing member 6 is formed so as to extend from the second top plate 6b to a position closer to the closing plate 2 from the intermediate surface C1. The second top plate 6a may be located closer to the closing plate 2 than the intermediate surface C1. In the example shown in FIG. 11, the end portion of the reinforcing member 6, that is, the portion of the second vertical wall 6b opposite to the second top plate 6a, which is closest to the closing plate 2, is closed with the intermediate surface C1. It is located between the plates 2.
[0072]
　In one first vertical wall 1b, a surface having a height (HL / 2) of half the height HL from the closing plate 2 of the one first vertical wall 1b to the first top plate 1a is an intermediate surface. It becomes C1. Also in the other first vertical wall 1b, the surface having a height (HR / 2) of half the height HR from the closing plate 2 to the first top plate 1a of the other first vertical wall 1b is formed. It becomes the intermediate surface C1.
[0073]
　The structural member of this embodiment is a vehicle skeleton member. The structural member of the present embodiment can be suitably used for a bending crushing member that is expected to be deformed or broken due to bending. In this case, the structural member may have a closed cross-sectional structure with a reinforcing member added to improve the proof stress on the compression side. The structural members 10 and 10a of the above example can be used as vehicle skeleton members that are expected to be bent and deformed due to an impact on the first top plate 1a. In this case, breakage starting from the welded portion is unlikely to occur. Therefore, it is possible to obtain a vehicle skeleton member that is not easily destroyed.
[0074]
　Examples of vehicle frame members include front frame, rear frame, side sill, front pillar (A pillar), center pillar (B pillar), cross member, side rail, tunnel, bumper reinforcement, and various other reinforcements. Examples include frame-based parts of automobile structures. Since these automobile structures are deformed and destroyed when the automobile collides, the present invention is effective.
[0075]
　For example, when the above structural members 10 and 10a are applied to the B pillar, the hat member 1 is the outer, the closing plate 2 is the inner, and the reinforcing member 6 is the reinforcement. In this case, the structural member 10 is attached to the vehicle so that the hat member 1 is arranged on the outside of the vehicle and the closing plate 2 is arranged on the inside of the vehicle. As a result, the impact from the outside of the vehicle is input to the first top plate 1a of the hat member 1. When the structural members 10 and 10a are bent and deformed by the impact from the outside of the vehicle, a tensile force is generated between the welded portions 31 of the first vertical wall 1b and the second vertical wall 6b. Since the end portion 4 of the reinforcing member 6 is arranged between the welded portions 31, strain concentration in the vicinity of the welded portion 31 is suppressed. As a result, breakage starting from the HAZ softened portion around the welded portion 31 is less likely to occur.
[0076]
　For example, the structural members 10 and 10a may be arranged in the vehicle so that the method in which the welded portions 31 of the structural members 10 and 10a are lined up, that is, the longitudinal direction of the first vertical wall 1b follows the outer shape of the vehicle. That is, the structural member 10 may be arranged in the vehicle so that the direction in which the welded portions 31 of the structural members 10 and 10a are lined up is substantially orthogonal to the impact from the outside of the vehicle. As a result, the structural members 10 and 10a can efficiently absorb energy when they receive an impact from the outside of the vehicle. Further, it is possible to prevent the occurrence of breakage starting from the HAZ softened portion around the welded portion 31. As described above, a vehicle having the above structural member as a vehicle skeleton member and a vehicle including the above vehicle skeleton member are also included in the embodiment of the present invention.
[0077]
　Although one embodiment of the present invention has been described above, the above-described embodiment is merely an example for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-mentioned embodiment can be appropriately modified and carried out within a range not deviating from the gist thereof.
Description of the sign
[0078]
　1: Hat member
　2: Closing plate
　31, 32, 33: Joint part
　4: End part
　6: Reinforcing member
　10: Structural member
　1a: First top plate
　1b: First vertical wall
　1c: Flange
　6a: Second top plate
　6b : 2nd vertical wall

WE CLAIMS

[Claim 1]A hat member, a
　closing plate, a
　reinforcing member, and a
　plurality of welded portions
are provided, the
　hat member includes a first top plate, two first vertical walls, and two flanges, and
　　the first top plate is a first top plate. The first vertical wall is arranged between the two first vertical walls, the first vertical wall is arranged between the
　　top plate and the flange, the
　　flange is joined to the closing plate, and the
　reinforcing member is a second ceiling. A plate and two
　　second vertical walls are provided, the second top plate is arranged between the two second vertical walls,
　the first vertical wall and the second vertical wall are overlapped, and the
　plurality of welds are performed. The
　plurality of welded portions that join the first vertical wall and the second vertical wall and join the first vertical wall and the second vertical wall are the first heavens in the first vertical wall. It is on the closing plate side from the intermediate surface between the plate and the closing plate, and the
　tensile strength of the second vertical wall is larger than the tensile strength of the first vertical wall, and the tensile strength of
　the second vertical wall is higher than that of the second top plate of the second vertical wall. A
　vehicle skeleton member having an end portion on the opposite side being an end portion of the reinforcing member and having an end portion of the reinforcing member between the plurality of welded portions.
[Claim 2]
　The vehicle skeleton member according to claim 1, wherein the end portion of the reinforcing member crosses a region between adjacent welded portions.
[Claim 3]
　The end portion of the reinforcing member crosses the region between the adjacent welded portions, and is closer to the first top plate than the intermediate surface between the first top plate and the closing plate in the first vertical wall. The vehicle skeleton member according to claim 2, which extends to a position.
[Claim 4]
　The first vertical wall is formed so that the end portion of the first vertical wall is not arranged
　between the adjacent welded portions, and the end portion of the reinforcing member is formed between the adjacent welded portions. The vehicle skeleton member according to any one of claims 1 to 3, which overlaps with the first vertical wall.
[Claim 5]
　The vehicle according to any one of claims 1 to 4, wherein the end portion of the reinforcing member passing between the plurality of welded portions does not reach the ridgeline between the second top plate and the second vertical wall. Skeletal member.
[Claim 6]
　The vehicle skeleton member according to any one of claims 1 to 5, wherein the tensile strength of the second vertical wall is 1100 MPa or more.
[Claim 7]
　The vehicle skeleton member according to any one of claims 1 to 6, wherein the tensile strength of the first vertical wall is 980 MPa or less.
[Claim 8]
　A vehicle skeleton
　comprising the vehicle skeleton member according to any one of claims 1 to 7, the first top plate surface is arranged on the outside of the vehicle, and the
　closing plate is arranged on the inside of the vehicle.