Technical field
[0001]
　The present invention, at the time of collision between vehicles such as an automobile, to the support structure of the underrun protector one vehicle to prevent slips under the other vehicle.
The present application, on August 26, 2016, claiming priority based on Japanese Patent Application No. 2016-165626, filed in Japan, the contents of which are incorporated here.
BACKGROUND
[0002]
　For example, if the passenger cars and heavy vehicles such as trucks, such as a head-on collision or a rear-end collision, the difference in installation height of the strength member, such as a cross member provided on another of the vehicle, possibly passenger submerges under large vehicles is there. Therefore, the front and rear of the large vehicle, the underrun protector the strength member arranged according to the installation height of the strength member provided in the passenger car is provided. As a result, thereby preventing the penetration of passenger cars at the time of collision.
[0003]
　Conventional underrun protector is disclosed in Patent Documents 1-3. These underrun protector, the beam extending in the vehicle width direction is a bolt fastening structure to the body frame through the bracket and the stay (supporting structure).
[0004]
　Underrun protector, it is required to have a sufficient load-bearing performance. One way to evaluate the load bearing, in the position in the vehicle width direction outer side than the stay mounting position of the beam, the load on the impact surface of the beam (the surface on which another vehicle collides) was added, enter the degree of the load at maximum there is an evaluation method that you can. Performance as a product of the underrun protector, since depends on the relative merits of the load resistance, the maximum input load in load-bearing evaluation test has been desired to develop a further larger such underrun protectors than before. It is also desirable even more lightweight.
[0005]
　During the load input structure to resist bending moment in which the vehicle vertical direction and the axis in the beam, the stay is structured to resist torsional moments in which the vehicle vertical direction with the shaft is desired.
[0006]
　Patent Document 1, "and the frame web surface web surface which is oriented vertically and is fixed to, the fixed extends from the vehicle front-rear direction of the one end of the web surface in the vehicle width direction outer side underrun protector as an flange face, "and," the first member made of a top surface which is fixed with respect to the horizontal frame flange face is oriented and the web surface, extends from the vehicle longitudinal direction at one end of the upper surface vertically downward a front surface being fixed to the underrun protector Te, and sides are bent from the outside in the vehicle width direction of the end portion in the vehicle longitudinal direction is fixed to the web surface of the first member in the front surface, the second consisting of the fixing structure of the stay and the frame with member "structure to protect the side frame from the impact load at the time of minor collision is disclosed.
　Patent Document 2, the stay is a "stay body connecting the body frame and the beam", and "stay reinforcement for reinforcing the stay body", the "gusset to reinforce the connection portion of the stay and the beam", from is constituted by a gusset passed provided over between the beam and the stay, the structure to improve the resistance to the beam of bending deformation is disclosed. Further, Patent Document 2, the bent portion is a recess in the stay body by being arranged in the short direction across the stay main body, closed section is formed the stay reinforcement is fitted in the recess the stay construction is also disclosed structure with increased resistance to torsional deformation of the stay.
Patent Document 3, a connection structure for connecting the beam to the body frame, a stay that is formed so as to extend in the vertical direction, the bracket L-shaped provided between the beam and the stay, and the reinforcing member, the reinforcing the structure having a plate, and when the load is applied to the beam, the structure that causes an effect of inhibiting the deformation of the inside of the stay by the load transmitted through the beam is disclosed.
CITATION
Patent Document
[0007]
Patent Document 1: Japanese Patent 2010-132059 JP
Patent Document 2: Japanese Patent 2010-120512 JP
Patent Document 3: International Publication WO2016 / 125745 Patent
Summary of the Invention
Problems that the Invention is to Solve
[0008]
　However, Patent Document 1 relates to a fixing structure for protecting the side frames, only this technique is not improved load bearing performance.
　The supporting structure of Patent Document 2, the load input and the stay of torsional deformation of the gusset, out-of-plane deformation of the stay reinforcing portion web surface which is vertically disposed in the stay reinforcement portion progresses. This can not be obtained sufficient improvement of load-bearing performance.
The connection structure of Patent Document 3, when provided with openings in either or both sides of the vehicle width direction inside of the bracket or stay the vehicle longitudinal direction of the reinforcing plate, load bearing performance is lowered. That transmission, when an opening is provided on either or both sides of the vehicle longitudinal direction of the bracket, so bracket rigidity is lowered due to the formation of the opening, the load input from the bracket to the entire surface of the body frame side bracket not. Therefore, the load-bearing performance is degraded. Further, when an opening is provided on either or both sides of the vehicle longitudinal direction of the stay, since the reduced area that receives input from the reinforcing member, the load-bearing performance is lowered.
[0009]
　The present invention has been made in view of such problems of the prior art have, even as a load is applied to the vehicle width direction outer position than stay mounting position of the beam relative to torsional moments are input to the stay deformable can be suppressed, moreover, provides a support structure for excellent underrun protector lightweight load bearing performance.
Means for Solving the Problems
[0010]
　The present inventors have found that a stay main body for connecting the beam and the frame, and the stay reinforcement for reinforcing the stay main body, relative to the support structure of the underrun protector consisting gusset provided between the stay reinforcement and beam, the beam in the position of the vehicle width direction outer side than the stay mounting position of, when a load is applied to the impact surface of the beam (the surface on which another vehicle collides), the result of intensive studies for the occurrence of the stay of the torsional deformation, the following findings the present invention has been completed with. That is, an opening is provided in the stay body web surface which is oriented parallel to the vehicle vertical direction of the stay body, so as to be opposed to each other a pair of wall portion extending toward further from both ends of the opening in the vehicle width direction outer side to provided, at the height position of the vehicle vertical direction of the at least one gusset, by abutting the wall portion and the stay reinforcement, it can solve the above problems.
[0011]
　The gist of the present invention is as follows.
(1) comprises a stay main body for connecting the beam and the frame, and the stay reinforcement for reinforcing said stay main body from the outside of the vehicle width direction, and a gusset provided between the stay reinforcement and the beam, the opening is provided in the stay body web surface of the stay body, provided as a pair of wall portions from the vehicle longitudinal direction at both ends of the opening is extended outward in the vehicle width direction are opposite to each other, each wall portion is provided at a height corresponding to the installation position of the gusset, the support structure of the underrun protector is in contact in the vehicle width direction inner side surface of the stay reinforcement.
　Further, the following (2) to configure a may be such as (8).
(2) the opening has a shape of substantially square round rectangle composed of a pair of round portions which face each other and a pair of straight side portions opposed to each other, wherein in the vehicle width direction outer side from both the straight sides toward the wall portion which extends is in contact with the vehicle width direction inner surface of the stay reinforcement, the supporting structure of the underrun protector according to the above (1).
(3) the wall portion is formed by bending the stay body web surface, the (1) or (2) a support structure of the underrun protector according to.
(4) and the length L1 of the opening, and the average width W1 of the opening, the length L0 of the stay main body from the frame lower surface of the flange, the average width W0 of the stay main body, and the stay body relationship between the vehicle width direction of the height h of the closed section formed by the stay reinforcement is, 0.5 ≦ L1 / L0 ≦ 0.8 , and satisfies 2 × h ≦ W1 ≦ 0.85 × W0 , (2) or support structure of the underrun protector according to (3).
(5) the height h1 from the vehicle width direction outer side surface of the round portion toward the vehicle transverse direction outer extending been wall portion is 5 mm ≦ h1 ≦ 15 mm, one above (2) to (4) the support structure of the underrun protector according to one paragraph or.
(6) the upper and lower surface portions of the stay reinforcement vehicle vertical direction from both ends toward the inside in the vehicle width direction extending been stay reinforcement of provided, said upper and lower surface portion is in contact with the stay main body, the ( the support structure of the underrun protector as claimed in any one of 1) to (5).
(7) said frame includes a frame web surface which is oriented vertically, and a lower end from the frame lower surface which extends toward the vehicle transverse direction outer flange of the frame web surface, the stay main body, the and it is fixed at the frame web surface and the flange, the (1) the support structure of the underrun protector as claimed in any one of - (6).
(8) the stay body and the stay reinforcement comprises a steel plate having a 780MPa class or higher strength, the (1) the support structure of the underrun protector as claimed in any one of (1) to (7).
Effect of the invention
[0012]
　According to the present invention, even as a load is applied to the vehicle width direction outer position than stay mounting position of the beam, can suppress the variations to the twisting moment is input to the stay, yet, excellent lightweight load bearing performance it is possible to obtain a support structure of the underrun protector.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013]
FIG. 1 is a perspective view showing an underrun protector according to an embodiment of the present invention.
It is a [2] an enlarged perspective view of the support structure of the left side of the underrun protector of FIG.
[3] is an A-A sectional view of FIG.
A C part enlarged view of FIG. 4 FIG.
5 is a sectional view taken along line B-B of FIG.
6 is a plan view showing a load input condition to the underrun protector.
7 is a perspective view showing a support structure of the underrun protector Comparative Example 1.
8 is a perspective view of a modification of the underrun protector Comparative Example 1.
9 is a perspective view of a modification of the underrun protector in Example 1.
[Figure 10] when carrying out the load-bearing evaluation test simulation of Example 1 and Comparative Example 1 is a graph comparing the relationship between the displacement (the indentation amount) and load ratio at that time.
11 is a graph showing the relationship between the height h1 and the maximum load efficiency of the wall portion 4h of the circular portion of the opening.
DESCRIPTION OF THE INVENTION
[0014]
　Hereinafter, the supporting structure of the underrun protector according to an embodiment of the present invention will be described with reference to the drawings. In the specification and drawings, in the elements having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0015]
　As shown in FIG. 1, underrun protector 1 of the embodiment of the present invention, and a beam 2 extending in the vehicle width direction W, the beam 2 and the frame 20 of the underrun protector for connection between the support structure 3 which constructed.
[0016]
　The support structure 3 of the underrun protector, the stay main body 4 which connects the beam 2 and the frame 20, the stay reinforcement 5, and a gusset 6.
[0017]
　The stay main body 4, includes a stay main body web surface 4a which is oriented vertically, the stay main body longitudinal surface portion 4b extending from the end portion in the vehicle longitudinal direction L of the stay body web surface 4a on the outside of the vehicle width direction W substantially and it has a U of-shape. The stay main body 4 is connected to the frame 20 at the frame web surface mounting portion 4f and the frame lower surface mounting portion 4g, connected to the beam 2 by the beam attachment portion 4c. Stay main body 4 and the beam 2, using the bolt fastening for connection with the frame 20.
[0018]
　As shown in FIGS. 2 to 5, and the stay reinforcement web surface 5a stationing reinforcement 5 that is oriented vertically, from the end of the vehicle vertical direction V of the stay reinforcement web surface 5a inside the vehicle width direction W It has a shape in the form of a substantially U a stay reinforcement vertical surface portion 5b that extends. Stay reinforcement 5 is disposed so as to cover the opening of the stay main body 4 of the portion excluding the frame web surface mounting portion 4f of the stay main body 4. End of the vehicle longitudinal direction L of the stay reinforcement web surface 5a and the stay body longitudinal surface portion 4b, and closed section is formed by the end and the stay body web surface 4a of the stay reinforcement vertical surface portion 5b is connected. These use arc welding for connection. In the present embodiment by fixing the stay reinforcement 5 as this reinforces the stay main body 4 from the outside of the vehicle width direction W.
[0019]
　The gusset 6 is plural along the vehicle vertical direction V so as to pass a plate of a substantially triangular shape over the outer surface of the vehicle width direction W of the beam attachment portion 4c and the stay reinforcement web surface 5a (in this embodiment 2 Like) are arranged side by side.
[0020]
　Underrun protector support structure 3 according to an embodiment of to the present invention shown in FIGS. 2 and 3, the opening portion 4d of the substantially square round square shape is provided in the stay body web surface 4a, the vehicle of the opening 4d having a wall portion 4e which extend from both ends in the longitudinal direction L outside the vehicle width direction W. Wall portion 4e is provided so as to face each other. Wall portion 4e that is extended from the straight sides facing each other of the opening portion 4d of the substantially square round square in contact with the stay reinforcement 5, the upper gusset 6 is supported via the web surface 5a of the stay reinforcement 5 ing. Using arc welding to connect the wall portion 4e and the stay reinforcement 5. Note that the "substantially Rounded Rectangle" and straight sides facing a substantially square consists of a round portion having any curvature radius that connects the end points of each straight sides.
[0021]
　The support structure 3 of the underrun protector according to an embodiment of the present invention is constructed as described above. When performing load-bearing test with underrun protector 1 having a support structure 3 of the underrun protector, for example, as shown in FIG. 6, the position of the vehicle width direction outer side than the stay mounting position of the beam 2 (in FIG. 6 in position) of the arrow, and inputs a load against the indenter impact surface of the beam 2.
[0022]
　At this time, the support structure according to the third underrun protector of this embodiment, the stay at a height as shown in the examples below, the wall portion 4e connecting with the stay reinforcement 5 corresponds to the installation position of the gusset 6 since supporting the reinforcement web surface 5a, against the load input from the gusset 6, the stay reinforcement by reduction and the stay main body 4 and torsional deformation of the stay reinforcement 5 of plane deformation of the web surface 5a of the stay reinforcement 5 the reduction in out-of-plane deformation of the fifth web surface 5a, buckling of the stay reinforcement 5 can be suppressed. Here, the "height that corresponds to the installation position of the gusset 6" wall portion 4e connecting with the stay reinforcement 5 is a height that overlaps at the installation position of the gusset 6 in the vertical direction of the vehicle V.
[0023]
　Thereby, the resistance to twisting moment of the support structure 3 of the underrun protector is increased, improved load bearing performance of the underrun protector 1.
[0024]
　Further, according to the support structure 3 of the underrun protector of the present embodiment, since the an opening 4d, can also be achieved weight.
[0025]
　Having described the preferred embodiments of the present invention, the present invention is not limited to this example. Those skilled in the art within the scope of the technical idea described in the claims, it is clear that can conceive various modifications, technical scope of the invention as for their It is understood to belong to.
[0026]
　For example, the underrun protector support structure 3 of Figure 1 has been oriented substantially parallel to the straight sides of the opening portion 4d of the substantially square round square shape in the vertical direction of the vehicle V, and the straight edge portions vehicle in the longitudinal direction L substantially oriented parallel to, it may have a structure in which the wall portion 4e connecting with the stay reinforcement 5 supports the stay reinforcement web surface 5a at heights corresponding to the installation position of the gusset 6. Incidentally, the "height that corresponds to the installation position of the gusset 6" wall portion 4e connecting with the stay reinforcement 5 is a height that overlaps at the installation position of the gusset 6 in the vertical direction of the vehicle V. However, from the viewpoint of reducing out-of-plane deformation of the web surface 5a of the stay reinforcement 5 by torsional deformation of the stay main body 4 and the stay reinforcement 5, can support the stay reinforcement web surface 5a in a wide range of vehicle vertical direction V it is preferable to substantially oriented parallel to the straight edge portion in the vehicle vertical direction V.
[0027]
　For example, the support structure of the underrun protector 1 3, was integrated the stay body longitudinal surface portion 4b and the beam attachment portion 4c, connected to the stay main body 4 or the stay reinforcement 5 and separate a beam attachment portion 4c it may be.
[0028]
　Also, the underrun protector support structure 3 of Figure 1, an integral of a stay main body web surface 4a and the frame web surface installation part 4f, has been a separate frame lower surface mounting portion 4g, another frame web surface mounting portion 4f and the body, the frame lower surface mounting portion 4g may be integral with the stay main body 4 or the stay reinforcement 5.
[0029]
　It may also be a structure without the frame lower surface mounting portion 4g. On the other hand, by having a frame bottom surface mounting portion 4g, can be transmitted to the frame 20 and the load supporting structure 3 of the underrun protector is subjected in shear deformation, since the load resistance is increased, the required performance as underrun protector 1 it may be set as appropriate frame lower surface mounting portion 4g in accordance with.
[0030]
　It may also be a structure without the upper and lower surface portions 5b of the stay reinforcement 5. On the other hand, by providing the upper and lower surface portions 5b of the stay reinforcement 5, there is no opening in the vehicle vertical direction V of the stay main body 4 and the stay reinforcement 5, increased resistance to torsional deformation of the stay main body 4 and the stay reinforcement 5, since the load resistance increases, it may be set the upper and lower surface portions 5b of appropriate stays reinforcing member 5 according to the required performance as underrun protector 1.
[0031]
　In the above embodiment, the shape of the opening 4d provided in the stay body web surface 4a has been substantially square round square, if it is possible to support the stays reinforcement web surface 5a in the wall portion 4e, the opening 4d shape is not particularly limited.
[0032]
　Thus, the support structure 3 of the underrun protector 1 has an opening 4d is provided in the stay body web surface 4a, has a wall portion 4e extending from opposite ends of the opening 4d to the outside in the vehicle width direction W, the at a height wall portion 4e corresponding to the installation position of the gusset 6, with the configuration that is in contact with the inner surface of the vehicle width direction W of the stay reinforcement 5 you can enjoy the aforementioned effects. Even when the gusset 6 is installed a plurality, if the wall portion 4e is long it supports the stay reinforcement 5 at a height corresponding to the installation position of the at least one gusset, the gusset portion which supports 6 it is possible to suppress the out-of-plane deformation against load input from. In other words, even when the gusset 6 is installed a plurality, even without support stay reinforcement 5 as the wall portion 4e corresponding to the installation height of all of the gusset 6, as compared with the conventional structure resistant it is possible to improve the load performance. However, when a plurality of gussets 6 are provided, to support the stays reinforcing member 5 in the wall portion 4e having a length of as described in the above embodiment the top of the gusset 6 to the gusset 6 of the lowermost It is preferred. Here, "height corresponding to the installation position of the gusset" wall portion 4e connecting with the stay reinforcement 5 is a height that overlaps at the installation position of the gusset 6 in the vertical direction of the vehicle V.
[0033]
　The opening 4d of the substantially square round square, 2 to 5, and the stay body opening length L1 (the length in the vehicle vertical direction V), the average width W1 of the stay body opening (the vehicle longitudinal direction L of the length), the length of the flange of the frame bottom surface 20b of the stay main body 4 L0 (mm) (length in the vehicle vertical direction V), the length of the average width W0 (mm) (the vehicle longitudinal direction L of the stay body and is), the relationship between the height h of the vehicle width direction W of the closed section formed by the stay reinforcing member 5 and the stay main body 4 (mm) is, 0.5 ≦ L1 / L0 ≦ 0.8 and, it is preferably formed to satisfy the 2 × h ≦ W1 ≦ 0.85 × W0.
The average width W0 of the stay main body, which is the average of the maximum and minimum values of the stay body width (length in the vehicle front-rear direction L). The average width W1 of the stay body opening, an average of the maximum and minimum values of the stay body opening width (the length in the vehicle front-rear direction L).
　When L1 / L0 is less than 0.5, weight reduction effect is poor. Conversely, when the L1 / L0 is more than 0.8, there is a possibility that the effect of the load-bearing performance improvement is reduced by the area reduction of the stay body web surface 4a. If W1 is less than 2 × h, the height of the wall portion 4e (length in the vehicle width direction W) it will not be able to form more than h, and the wall portion 4e can not be brought into contact with the stay reinforcement web surface 5a. On the other hand, if W1 exceeds 0.85 × W0, effect of the load-bearing performance improvement is reduced by the area reduction of the stay body web surface 4a.
[0034]
　The curvature radius R of the round portion of the substantially square round square (mm) is preferably R = 0.5 × W1. This can avoid the breakage due to strain concentration at the time of molding due to correspond to the state Chokuhen portion and the round portion is smoothly connected, connect discontinuously.
[0035]
　Also, it is shown in FIGS. 2-4, the height h1 of the extended been wall portion 4h from the vehicle width direction outer side face of the round portion of the opening portion 4d of the substantially square round rectangle towards the outside of the vehicle width direction W is is preferably a 5mm ≦ h1 ≦ 15mm. By providing the wall portion 4h of the circular portion, which contributes to the out-of-plane deformation prevention of the stay main body 4. Although it is shown in the Examples below, by connecting the wall portion 4e of the straight sides of the opening 4d in the wall portion 4h of the circular portion, increased load bearing performance. The height of the wall portions 4h of the circular portion h1 is poor, the effect is less than 5 mm, in addition to the height h1 of the wall portion 4h of the circular portion leading to weight increase in spite of the effect is 15mm or more, the above steel sheet 780MPa when applied, it is likely to edge breakage at the time of molding of the wall portion 4h of the circular portion. It is more preferable that the height h1 of the wall portion 4h of the circular portion is 8 mm ≦ h1 ≦ 12 mm. Thus, only for lighter rather than opening 4d is provided, an opening 4d provided, further wall portion 4h of the circular portion of the opening portion 4d reinforces the stay main body 4, further wall portion 4e but by supporting the stay reinforcement body 5, increasing the load-bearing performance of the underrun protector support structure.
Example
[0036]
　And underrun protector having a supporting structure of a conventional underrun protector was performed to simulate the load bearing evaluation test using the underrun protector having a support structure of the underrun protector according to the embodiment. The underrun protector support structure of the conventional structure is the structure in which the opening is not formed in the stay body 54 as shown in FIG. 7 (Comparative Example 1). The supporting structure of the underrun protector according to the present embodiment is a structure (Example 1) shown in FIG. Each stay body 780MPa grade /3.6mm thickness of the steel plate, the stay reinforcement body 780MPa grade /2.9mm thickness, gussets 780MPa grade /3.2mm thickness, frame underside attachment portion 780MPa grade /3.2mm thick steel plate is used. The height h of the vehicle width direction of the closed section formed by the stay main body and the stay reinforcement in the first embodiment 40 mm, height h1 of the wall portion 4h of the circular portion of the opening 8.2 mm, the stay main body W1 / W0 in which the average width W1 divided by the average width W0 of the stay main body of the opening 0.65, L1 / L0 obtained by dividing the opening length L1 of the stay main body of the stay main body from the frame lower surface of the flange in the length L0 it is 0.73.
[0037]
　Evaluation test is performed in against an indenter, and inputs a load that the beam side portions in the vehicle width direction outer position than the stay mounting position as shown in FIG. Input position of the load is the same in Example 1 and Comparative Example 1. The pushing amount of the indenter to record input load (displacement) and was evaluated for load bearing underrun protector of Example 1 and Comparative Example 1.
[0038]
　Comparison with Comparative Example 1 in FIGS. 8 and 9 the deformation of the underrun protector support structure of the first embodiment. Out-of-plane deformation in the web surface portion of the stay reinforcement 8 (buckling) is observed, but observed that plane in FIG deformation. Therefore, in the present invention, out-of-plane deformation of the web surface of the stay reinforcement (buckling) was confirmed to be inhibited.
[0039]
　The relationship between the input load on the indentation of Example 1 and Comparative Example 1 shown in FIG. 10. Load capacity ratio shown in FIG. 10 is a value obtained by normalizing the recorded load by the maximum load of Comparative Example 1. From Figure 10, the load of Example 1 was confirmed to be improved as compared to Comparative Example 1.
[0040]
　The weight ratio of the support structure of the maximum load ratio and underrun protector Example 1 for Comparative Example 1 shown in Table 1. Load ratio in Table 1 is a value obtained by dividing the maximum load of Example 1 at a maximum load of Comparative Example 1. Table weight ratio of 1 is divided by the weight of the support structure of the underrun protector underrun comparing the weights of a support structure of the protector 1 of the first embodiment.
[0041]
[Table 1]

[0042]
　As shown in Table 1, Example 1 as compared with Comparative Example 1, the maximum load is improved by 10%, it has declined by weight 5% or more. That is, the support structure of the underrun protector in Example 1 was shown to compared with the conventional weight reduction can be achieved while improving the load carrying capacity.
[0043]
　Next, the upper and lower vertical surface portion 5b of the removed structure (Comparative Example 2) and the frame lower surface from the structure of Example 1 mounting portion 4g and the stay reinforcement frame lower surface mounting portion 4g and the stay reinforcement 5 from the structure of Comparative Example 1 It was conducted the same evaluation tests for the structure obtained by removing a surface portion 5b (example 2). The weight ratio of the support structure of the maximum load ratio and underrun protector Example 2 for Comparative Example 2 shown in Table 2.
[0044]
[Table 2]

[0045]
　As shown in Table 2, carried as compared with Comparative Example 2 Example 2 is the maximum load is increased by 10%, it has declined by weight 5% or more. That is, the support structure of the underrun protector of Example 2 over the prior art, the load-bearing performance can be achieved is lightweight while improving the effect of the frame lower surface mounting portion 4g and the upper and lower surface 5b of the stay reinforcement 5 it has been shown that with or without a.
[0046]
　Next, the structure of Example 1, the height h1 of 0mm and 38.2mm structure was set to body wall portion 4h of the circular portion of the opening (Example 3, Example 4) The same evaluation test Carried out. The relationship between the height h1 and the maximum load efficiency of the wall portion 4h of the circular portion shown in Figure 11. The maximum load efficiency divided by the total weight of the support structure of the maximum load the underrun protector to be input to the beam, as this value is higher, it means that a good balance of weight and load-bearing performance.
[0047]
　11 than the height h1 of the wall portion 4h of the circular portion within 0mm structure from Trip structures 8.2mm becomes higher maximum load efficiency. Therefore, by connecting the wall portion of the round portion of the wall portion of the straight sides, it was shown that the load-bearing performance is enhanced. On the other hand, the height h1 of the wall portion 4h of the circular portion as compared to the structure of 38.2 mm, towards the structure of 8.2mm becomes higher maximum load efficiency. Therefore, even if too high wall portion of the round portion, weight increase despite the effect of the maximum load increase that is larger indicated, the optimum range is indicated.
Industrial Applicability
[0048]
　The present invention, therefore can be applied to the support structure of the underrun protector is mounted on a vehicle such as an automobile, industrial applicability is great.
DESCRIPTION OF SYMBOLS
[0049]
1 underrun protector
2 beam
3 underrun protector supporting structure
4 stay main body
4a stay body web surface
4b stay body longitudinal surface portion
4c beam attachment portion
4d opening
4e wall portion
4f frame web surface mounting portion
4g frame lower surface mounting portion
4h round of wall portion
5 stays reinforcement
5a stays reinforcement web surface
5b stays reinforcement vertical face portion
6 gussets
20 frame
20a frame web surface
20b frame lower surface
L0 frame vehicle vertical direction of the stay main body from the lower surface portion length
L1 stay body opening length
W0 the average width of the stay body
W1 stay body opening of the average width
h stay body and the height of the closed section formed by the stay reinforcement
height of the wall portion that extends from h1 opening round portions
L vehicle longitudinal direction
W in the vehicle width direction
V vehicle up and down direction

The scope of the claims
[Requested item 1]
　A stay main body for connecting the beam and the frame,
　and the stay reinforcement for reinforcing said stay main body from the outside of the vehicle width direction,
　and a gusset provided between the stay reinforcement and the beam,
　of the stay body opening is provided in the stay body web surface,
　provided as a pair of wall portions that vehicle from the front and rear opposite ends outward in the vehicle width direction to extend the opening face each other,
　wherein each wall portion , provided at a height corresponding to the installation position of the gusset it is abutted against the vehicle width direction inner surface of the stay reinforcement
support structure underrun protector, characterized in that.
[Requested item 2]
　The opening has the shape of a substantially square round rectangle composed of a pair of round portions which face each other and a pair of straight side portions opposed to each other, wherein both of the straight sides toward the vehicle transverse direction outer each wall portion extending is in contact with the vehicle width direction inner surface of the stay reinforcement
support structure underrun protector according to claim 1, characterized in that.
[Requested item 3]
The support structure of the underrun protector according to claim 1 or 2 wherein the wall portion, characterized in that it is formed by bending the stay body web surface.
[Requested item 4]
　The length L1 (mm) of the opening, said the average width of the opening W1 (mm), the length of the stay main body from the frame lower surface of the flange L0 and (mm), the average width of the stay body W0 and (mm), the relationship between the stay body and the height of the vehicle width direction of the closed section formed by the stay reinforcement h (mm) is, 0.5 ≦ L1 / L0 ≦ 0.8, and, 2 × support structure underrun protector according to claim 2 or 3, characterized in that satisfy h ≦ W1 ≦ 0.85 × W0.
[Requested item 5]
　Any one of claims 2-4, wherein the height h1 from the vehicle width direction outer side surface toward the outer side in the vehicle width direction extends to wall surface portion of the round portion is 5 mm ≦ h1 ≦ 15 mm the support structure of the underrun protector as claimed in claim.
[Requested item 6]
　Claims wherein the upper and lower surface portions of the stay reinforcement vehicle vertical direction from both ends toward the inside in the vehicle width direction extending been stay reinforcement of provided, said upper and lower surface portion, characterized in that it is in contact to the stay main body the support structure of the underrun protector according to any one of claims 1-5.
[Requested item 7]
　The frame includes a frame web surface which is oriented vertically, and a lower end from the frame lower surface which extends toward the vehicle transverse direction outer flange of the frame web surface,
　the stay main body, said frame web surface and it is fixed by the flange
support structure underrun protector according to any one of claims 1 to 6, characterized in that.
[Requested item 8]
　The support structure of the underrun protector as claimed in any one of claims 1 to 7, the stay main body and the stay reinforcement is characterized in that it consists of steel plate with 780MPa grade or strength.