Shock absorbing structure for vehicular body

Abstract

To suppress reduction of load to be received by an energy absorbing member at the initial stage of collision by, in a shock absorbing structure including the energy absorbing member that includes a pair of vertical walls extending in the input direction of the collision load, generating a moment in a direction in which the pair of vertical walls becomes close to each other upon receiving the collision load in such a way that the pair of vertical walls is deformed so as to abut with each other without forming any bending shape of the pair of vertical walls that results in deformation.SOLUTION: A shock absorbing structure for vehicular body includes an energy absorbing member 20 that has a cross-sectional shape in the input direction of a collision load formed in a hat shape. Ceiling portions 20A in the hat shape are placed so as to face with each other in the input direction. Each of flanges 20C and each of coupled portions 20D, 20E of the ceiling portions 20A relative to a pair of vertical walls 20B are formed in a bending shape. Regarding the dimension in the direction in which each flange 20C extends in the bending shape, a first dimension L1 of the bending shape at a side of the flange 20C is greater than or equal to a predetermined value and is greater than or equal to a second dimension L2 of the bending shape at a side of the ceiling portion 20A.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an impact absorbing structure for a vehicle body. [Background technology]

[0002] A structure is known that absorbs impact during a side collision by arranging an energy absorbing member B inside a rocker (generally called a side sill) A with a closed cross-sectional structure as shown in Fig. 20 (see Patent Document 1). During a side collision, the energy absorbing member B receives a collision load in the direction of the arrow and gradually deforms as shown in Figs. 21 and 22 to absorb the collision energy and protect the occupants. In addition, it is configured to protect the battery (not shown) and other components located inside the rocker A in the vehicle width direction.

[0003] The energy absorbing member B of the invention in Patent Document 1 is configured by having a pair of vertical walls C extending generally along the direction of the collision load, and grooves D recessed in opposing directions being formed in each of the vertical walls C. When subjected to a collision load, the vertical walls C deform in opposing directions with the grooves D as a deformation trigger, causing the vertical walls C to abut against each other, thereby increasing the amount of energy absorption compared to when the energy absorbing member B is not provided. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7099552 Summary of the Invention [Problem to be solved by the invention]

[0005] In the invention of Patent Document 1, since the pair of vertical walls C are made to be easily deformed by the grooves D at the initial stage of a collision, there is a problem that the load received by the energy absorbing member B at the initial stage of a collision is reduced.

[0006] The object of the present invention is to generate a moment in a direction in which the pair of vertical walls approach each other when subjected to a collision load in an impact absorbing structure for a vehicle body including an energy absorbing member having a pair of vertical walls extending along the input direction of a collision load, thereby causing the pair of vertical walls to deform so as to abut against each other when subjected to the collision load without forming a bent shape in the pair of vertical walls that may trigger deformation such as a groove, thereby suppressing a decrease in the load received by the energy absorbing member at the initial stage of a collision. [Means for solving the problem]

[0007] The vehicle body impact absorption structure of the first invention of the present invention comprises an energy absorbing member extending in a direction intersecting the input direction of a collision load within a collision area of ​​the vehicle body and having a hat-shaped cross-sectional shape along the input direction, the hat-shaped energy absorbing member comprising a top plate portion, a pair of vertical wall portions, and a pair of flange portions, the top plate portion having its plate surfaces arranged facing the input direction, the pair of flange portions both fixed to a single fixing member that receives the collision load, each of the flange portions and each of the joints of the top plate portion with respect to the pair of vertical wall portions is formed by a curved shape having an R-surface portion or an inclined surface portion, and the dimension of the curved shape of each joint portion in the direction in which each of the flange portions extends is such that a first dimension of the curved shape on the flange portion side is equal to or greater than a second dimension of the curved shape on the top plate portion side, and the first dimension is greater than or equal to a predetermined value.

[0008] A second aspect of the present invention is the above-mentioned first aspect, wherein the pair of vertical walls are arranged parallel to each other.

[0009] The third invention of the present invention is the above-mentioned second invention, wherein the ratio of a fourth dimension, which is the distance between the top plate portion and the fixing member, to a third dimension, which is the distance between the pair of vertical wall portions, is 1:7 to 1:2.5.

[0010] A fourth aspect of the present invention relates to any one of the first to third aspects of the present invention, wherein the energy absorbing member is made up of two members joined at the top plate portion of the hat shape.

[0011] The fifth invention of the present invention, in any one of the first to third inventions, is characterized in that the pair of vertical wall portions have a plurality of beads formed by concave or convex stripes extending along the opposing direction between the top plate portion and each of the flange portions, along the extension direction of the energy absorbing member. Effect of the Invention

[0012] According to the present invention, the energy absorbing member has a first dimension equal to or greater than the second dimension, and the first dimension is equal to or greater than a predetermined value. Therefore, when the energy absorbing member receives a collision load from the top plate side toward the flange side, a force acts on the top plate side of the vertical wall portions in a direction that separates the vertical wall portions from each other, and a moment acts on the flange side in a direction that brings the top plate sides of the vertical wall portions closer to each other. As a result, the vertical wall portions deform to approach each other, and eventually come into contact with each other. Therefore, the pair of vertical walls can be brought into contact with each other without providing the vertical wall portions with grooves that promote deformation of the vertical wall portions as in the conventional technology. Therefore, the load received by the energy absorbing member at the beginning of the collision can be suppressed from decreasing due to the influence of the grooves. That is, the load decrease at the beginning of the collision can be suppressed to realize efficient energy absorption, and the mass and cost of the energy absorbing member can be reduced. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic configuration diagram showing a first embodiment of the present invention. [Diagram 2] FIG. 2 is a vertical cross-sectional view of the locker of the first embodiment. [Diagram 3] FIG. 3 is an enlarged view of part III in FIG. 2. [Figure 4] 3. FIG. 4 is an enlarged view of part III in FIG. 2, showing a modification of FIG. [Diagram 5] FIG. 2 is a perspective view of an energy absorbing member according to the first embodiment. [Figure 6] FIG. 2 is a plan view of the energy absorbing member. [Figure 7] 5 is an explanatory diagram of a moment generated on the flange side when the energy absorbing member receives a collision load. FIG. [Figure 8]10A and 10B are diagrams illustrating forces generated on the top plate side when the energy absorbing member receives a collision load. [Figure 9] 5A to 5C are explanatory diagrams illustrating deformation of the energy absorbing member in the early stage of a collision when the energy absorbing member receives a collision load; [Figure 10] 5A to 5C are explanatory diagrams illustrating deformation of the energy absorbing member at the end of a collision when the energy absorbing member receives a collision load; [Figure 11] 4 is a characteristic diagram showing deformation characteristics of the energy absorbing member when subjected to a collision load, in terms of load-displacement characteristics. FIG. [Figure 12] This is a CAE image showing the simulation results of deformation at the initial stage of a collision when the above-mentioned energy absorbing member is subjected to a collision load, and shows the state of deformation when the first dimension of the bending shape of each joint of the flange portion and the top plate portion to the vertical wall portion is 5 mm and the second dimension is 5 mm. [Figure 13] This is a CAE image similar to that of FIG. 12, showing the deformation state when the first dimension is 10 mm and the second dimension is 10 mm. [Figure 14] This is a CAE image similar to that of FIG. 12, showing the deformation state when the first dimension is 15 mm and the second dimension is 5 mm. [Figure 15] This is a CAE image similar to that of FIG. 12, showing the deformation state when the first dimension is 15 mm and the second dimension is 10 mm. [Figure 16] This is a CAE image similar to that of FIG. 12, showing the deformation state when the first dimension is 4 mm and the second dimension is 4 mm. [Figure 17] This is a CAE image similar to that of FIG. 12, showing the deformation state when the first dimension is 5 mm and the second dimension is 10 mm. [Figure 18] FIG. 4 is a vertical sectional view of a locker according to a second embodiment of the present invention. [Figure 19] FIG. 11 is a vertical sectional view of a locker according to a third embodiment of the present invention. [Figure 20] FIG. 2 is a vertical sectional view of a locker according to a conventional example of the present invention. [Figure 21] 21 is an explanatory diagram showing a schematic diagram of deformation in the initial stage of a collision when the conventional example in FIG. 20 is subjected to a collision load. FIG. [Figure 22]21 is an explanatory diagram showing a schematic diagram of deformation at the end of a collision when the conventional example in FIG. 20 is subjected to a collision load. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] <Overall configuration of the first embodiment> Hereinafter, an embodiment of the impact absorbing structure according to the present invention will be described with reference to the drawings. The first embodiment in FIG. 1 is an impact absorbing structure 1 for a battery in a side collision of an electric vehicle. However, this is only one embodiment, and the present invention is not limited to electric vehicles, and can be applied to impact absorbing structures accompanying collisions with various parts of various vehicles. In addition, in the directional indications in the explanation of each figure, UPR indicates the upper side, OUT indicates the outside as seen from inside the vehicle, FR indicates the front side of the vehicle, and RR indicates the rear side of the vehicle. Therefore, the direction indicated by UPR is the vertical direction of the vehicle body, the direction indicated by OUT is the width direction of the vehicle body, and the directions indicated by FR and RR are the front-rear direction of the vehicle body.

[0015] FIG. 1 is a schematic vertical cross-sectional view of a main part of the overall configuration of an impact absorbing structure 1 to which the first embodiment is applied, showing a pole side impact test state in which a pole 2 is arranged. In this embodiment, a battery 3 of an electric vehicle is arranged under a floor 4 of the electric vehicle. A locker 10 that forms the framework of the lower body of the vehicle is arranged on the outer side of the floor 4, and a side door 5 (usually a front door) is arranged on the outer side of the locker 10. The pole 2 in the pole side impact test is further arranged on the outer side. In this embodiment, when the side door 5 collides with the pole 2, energy absorption in the collision is performed within a range S between the side door 5 and the battery 3 to protect the battery 3. In particular, the rocker 10 is adapted to absorb energy. A cross member 6 is provided on the floor 4, extending in the vehicle width direction. A plurality of cross members 6 are provided in the vehicle front-rear direction to reinforce the floor 4 against a side impact load.

[0016] In this embodiment, the energy absorbing member 20 is disposed over the entire area in the vehicle front-rear direction inside the locker 10, and the side impact energy is absorbed at the position of the locker 10. The locker 10 has an outer rocker member 11 disposed on the outside and an inner rocker member 12 disposed on the inside, both of which are formed in a so-called hat shape in cross section along the vehicle width direction, which is the input direction of the collision load to the locker 10. The two members 11, 12 are overlapped and combined with each other with their open sides facing each other to form a closed cross-sectional structure. As a result, the locker 10 is formed in a hollow structure, and this hollow structure has a form in which the space extends in the vehicle front-rear direction. The material of the energy absorbing member 20 is a steel material (for example, a steel plate with a tensile strength of 590 MPa or more) suitable for absorbing energy by deformation due to crushing. Other materials such as aluminum can also be used.

[0017] 2 shows the detailed structure of locker 10. Outer locker member 11 and inner locker member 12 are both formed with a hat-shaped cross section and each include top plate portions 11A, 12A, vertical wall portions 11B, 12B, and flange portions 11C, 12C. Outer locker member 11 and inner locker member 12 are combined with each other so that the open sides of the hat shapes face each other, and each pair of flange portions 11C, 12C are joined so that they overlap.

[0018] In the closed cross-sectional structure formed by the outer rocker member 11 and the inner rocker member 12, an energy absorbing member 20 extending in the front-rear direction of the vehicle body is disposed as shown in FIG. 5. The energy absorbing member 20, like the outer rocker member 11 and the inner rocker member 12, has a hat-shaped cross section along the vehicle body width direction, which is the input direction of the collision load to the locker 10. Therefore, the energy absorbing member 20 includes a top plate portion 20A, a pair of vertical wall portions 20B, and a pair of flange portions 20C. The pair of vertical wall portions 20B are disposed parallel to each other. The energy absorbing member 20 may be formed by press-molding a single steel plate, but here, the energy absorbing member 20 having a hat-shaped cross section is formed by welding an upper member 201 and a lower member 202 formed by dividing the energy absorbing member 20 having a hat-shaped cross section into two in the vertical direction. The welding is performed at the portion forming the top plate portion 20A. Therefore, the outer ends of the upper member 201 and the lower member 202 forming the top plate portion 20A are provided with joints 201A and 202A that are joined to each other by being flush with each other. By forming the energy absorbing member 20 in two parts, upper and lower, in this manner, it is possible to facilitate manufacturing. This is because, when forming the energy absorbing member 20 by press-molding a single steel plate, it is necessary to perform press molding using a press mold that is matched to a shape in which the width dimension (fourth dimension) W of the energy absorbing member 20 is sufficiently larger than the vertical dimension (third dimension) H of the energy absorbing member 20. On the other hand, when forming the energy absorbing member 20 in two parts, upper and lower, it is possible to easily form one energy absorbing member 20 by press-molding the upper member 201 and the lower member 202 individually and then joining them.

[0019] Incidentally, the ratio of the width dimension (the distance between the top plate portion 20A and the top plate portion 12A of the inner locker member 12) W to the vertical dimension (the distance between the vertical wall portions 20B) H of the energy absorbing member 20 is set to about 1:7 to 1:2.5. The ratio of the width dimension W to the vertical dimension H of the energy absorbing member 20 may be set to about 1:5.5 to 1:3. This ratio is optimal for realizing the expected deformation in which, when the energy absorbing member 20 receives a collision load, the pair of vertical wall portions 20B of the energy absorbing member 20 do not deform so as to bend in the same direction, and the pair of vertical wall portions 20B deform in opposing directions to come into contact with each other, and then are crushed, as described below.

[0020] The energy absorbing member 20 is disposed with its top plate portion 20A facing the input direction of the collision load and abuts against the inner wall surface of the top plate portion 11A of the outer rocker member 11. The top plate portion 20A of the energy absorbing member 20 is joined to the top plate portion 11A of the outer rocker member 11 by one-sided access welding or by adhesive. In addition, a pair of flange portions 20C are welded to the inner wall surface of the top plate portion 12A of the inner rocker member 12. Therefore, the top plate portion 12A of the inner rocker member 12 constitutes a fixing member that receives the collision load applied to each flange portion 20C.

[0021] 1, the joining positions of the pair of flanges 20C to the inner rocker member 12 are positions corresponding to the widthwise outer sides of the cross member 6 on the floor 4. With this arrangement, the energy absorbing member 20 can efficiently suppress the effect of a side impact on the floor 4. Also, since the energy absorbing member 20 has a pair of vertical wall portions 20B arranged in parallel, there is an advantage that the position of the energy absorbing member 20 can be easily aligned to the portion where impact is desired to be absorbed, compared to an energy absorbing member having an inclined shape in which the gap between the pair of vertical wall portions 20B is wider on the flange portion 20C side than on the top plate portion 20A side.

[0022] The joint 20E connecting the top plate 20A and each vertical wall 20B, and the joint 20D connecting each vertical wall 20B and each flange 20C are formed in a curved shape with an R-surface or an inclined surface. FIG. 3 shows an enlarged example of the curved shape of the joint 20D formed by the R-surface. FIG. 4 shows an enlarged example of the curved shape of the joint 20D formed by the inclined surface. The R-surface in FIG. 3 is formed by forming a curved shape by a circular arc surface, and the inclined surface in FIG. 4 is formed by forming a curved shape by an inclined surface. Here, the inclined surface is formed such that the angle θ of the inclined surface forming the joint 20D with respect to the vertical wall 20B and the flange 20C is 135 degrees. Although the enlarged view of the joint 20D is shown in FIG. 3 and FIG. 4, the joint 20E has a similar structure. The dimensions of each connecting portion 20D and connecting portion 20E in the bending shape in the direction in which flange portion 20C extends (up and down) are such that the first dimension L1 of each connecting portion 20D is equal to or greater than a predetermined value (e.g., 5 mm) and is equal to or greater than the second dimension L2 (see Figure 2) of connecting portion 20E.

[0023] As shown in Figs. 5 and 6, a plurality of beads 20F are formed on each vertical wall portion 20B of the energy absorbing member 20. Figs. 5 and 6 show the energy absorbing member 20 joined to the inner rocker member 12 with the outer rocker member 11 removed. The beads 20F are formed by concave or convex stripes extending along the opposing direction between the top plate portion 20A and the flange portion 20C. In Figs. 5 and 6, the beads 20F are formed by convex stripes in which the upper and lower surfaces of each vertical wall portion 20B are bulged in a linear mountain range shape. In this embodiment, it is desirable that four or more beads 20F are included within a dimensional range P corresponding to the diameter of the pole 2 as shown in Fig. 6. Incidentally, the diameter of the pole in the pole side impact test is set to 254 mm. By forming the beads 20F on the vertical wall portion 20B in this way, it is possible to appropriately increase the deformation strength of the vertical wall portion 20B when the energy absorbing member 20 is subjected to a collision load from the top plate portion 20A toward the flange portion 20C due to collision with the pole 2.

[0024] <Effects of the First Embodiment> FIG. 7 shows the transmission of force and the generation of moment when the energy absorbing member 20 receives a collision load from the direction of the arrow F. When the energy absorbing member 20 receives the collision load of the arrow F, the pair of vertical wall portions 20B apply a force F1 toward the top plate portion 12A of the inner locker member 12 through the flange portion 20C. Since the joint portion 20D is present between the vertical wall portion 20B and the flange portion 20C as described above, the force F1 in the vertical wall portion 20B generates a moment in the flange portion 20C such that the tip side of the flange portion 20C (the side away from the joint portion 20D) is lifted as shown by the arrow M1. This moment becomes a force that brings the top plate portion 20A sides of the vertical wall portions 20B closer to each other. That is, this force becomes a force that deforms each vertical wall portion 20B as shown by the imaginary line in FIG. 7.

[0025] 8 shows the state of force F2 generated on the top plate portion 20A side when the energy absorbing member 20 receives a collision load from the direction of arrow F. When the energy absorbing member 20 receives the collision load of arrow F, a force F2 is generated in the top plate portion 20A, which expands its area in the vertical direction while expanding the top plate portion 20A side of the vertical wall portion 20B in the vertical direction as shown by the imaginary line.

[0026] Here, as described above, the dimension L1 of the joint 20D is set to be equal to or greater than the dimension L2 of the joint 20E, and the dimension L1 is set to be equal to or greater than a predetermined value. Therefore, the effect of moving the vertical wall portions 20B closer to each other by the moment M1 as shown by the imaginary line in FIG. 7 is greater than the effect of moving the vertical wall portions 20B away from each other by the force F2 as shown by the imaginary line in FIG. 8. As a result, the energy absorbing member 20 deforms the vicinity of the center of the pair of vertical wall portions 20B in the width direction so that they approach each other as shown by the imaginary line in FIG. 7. As a result, the interaction between the moment M1 and the force F2 causes the pair of vertical wall portions 20B of the energy absorbing member 20 to deform into a shape that approaches each other at the early stage of the collision as shown in FIG. 9. Thereafter, the deformation progresses further and the pair of vertical wall portions 20B come into contact with each other, and at the later stage of the collision, the locker 10 and the energy absorbing member 20 are crushed as shown in FIG. 10. As a result, the collision energy is absorbed by the locker 10 equipped with the energy absorbing member 20.

[0027] FIG. 11 shows the load-displacement characteristics (FS characteristics) of the locker 10 of the present invention. In FIG. 11, the solid line shows the characteristics of the locker 10 of the first embodiment, and the dashed line shows the characteristics of the locker A of the conventional example of FIG. 20. In the locker 10 of the present invention shown by the solid line, the pair of vertical wall portions 20B are suddenly bent so as to approach each other at the position indicated by N1, and the pair of vertical wall portions 20B abut each other at the position indicated by N2. The load is relatively greatly reduced at the position N2. Compared to the locker A of the conventional example of FIG. 20 shown by the dashed line, the locker 10 of the present invention has a temporarily lower load than the locker A at the position indicated by N2, but the load is greater than the locker A throughout the entire characteristic. In the locker A of the conventional example, a groove D that triggers the deformation of the vertical wall C is formed as shown in FIG. 20, so that the vertical wall C is deformed by a small load as shown by N3 in FIG. 11, and the load received by the energy absorbing member B is smaller overall. Therefore, it can be seen that the locker 10 has a larger energy absorption amount than the locker A.

[0028] 12 to 17 show the results of CAE analysis performed in the first embodiment described above, with the first dimension L1 and the second dimension L2 being changed in various ways as shown in Table 1. FIG.

[0029] [Table 1]

[0030] 12 to 17, in the cases of Figs. 12 to 15 where the first dimension L1 is equal to or greater than a predetermined value (5 mm) and is equal to or greater than the second dimension L2, the pair of vertical wall portions 20B of the energy absorbing member 20 subjected to a collision load can be brought into contact with each other. On the other hand, in the cases of Figs. 16 and 17 where the above conditions are not satisfied, the pair of vertical wall portions 20B cannot be brought into contact with each other. From these results, it is understood that in order to deform the pair of vertical wall portions 20B of the energy absorbing member 20 so as to bring them into contact with each other without providing the groove D as in the above-mentioned conventional example, the first dimension L1 needs to be equal to or greater than 5 mm and L1≧L2.

[0031] <Second embodiment> Fig. 18 shows the second embodiment. The second embodiment is characterized by the fact that the top plate portion 21A of the energy absorbing member 21 is not in contact with the top plate portion 11A of the outer locker member 11 but is spaced apart from it. The other configurations of the second embodiment are the same as those of the first embodiment, and therefore repeated explanations of the same parts will be omitted.

[0032] In the second embodiment, the energy absorbing member 21 installed in the space of the locker 10 is smaller in width than the energy absorbing member 20 in the first embodiment. The energy absorbing member 21 is fixed by welding a pair of flanges 21C to the top plate portion 12A of the inner locker member 12. The top plate portion 21A of the energy absorbing member 21 does not abut against the top plate portion 11A of the outer locker member 11, but is disposed slightly spaced therefrom.

[0033] In this way, in the second embodiment, since the top plate portion 21A of the energy absorbing member 21 is separated from the top plate portion 11A of the outer rocker member 11 without abutting thereon, it is possible to suppress the occurrence of defective products due to manufacturing errors. That is, it is possible to prevent a manufacturing error in which the width dimension W1 of the energy absorbing member 21 is larger than the width dimension W2 of the internal space of the locker 10, which makes it difficult to join the flange portion 11C of the outer rocker member 11 and the flange portion 12C of the inner rocker member 12. Therefore, in the second embodiment, it is possible to improve the manufacturing yield and suppress the manufacturing cost compared to the first embodiment. Note that the collision energy absorption amount in the second embodiment is reduced by the amount that the top plate portion 21A of the energy absorbing member 21 is separated from the top plate portion 11A of the outer rocker member 11 without abutting thereon, but the reduction in the amount of collision energy absorption can be reduced by reducing the above-mentioned separation distance.

[0034] <Third embodiment> 19 shows the third embodiment. The third embodiment is characterized by the fact that a pair of flanges 22C of the energy absorbing member 22 is fixed to a fixing member 223 by welding, and the fixing member 223 is arranged apart from the top plate portion 12A of the inner locker member 12 without abutting the top plate portion 12A. The other configurations of the third embodiment are the same as those of the first embodiment, and therefore repeated explanation of the same parts will be omitted.

[0035] In the third embodiment, the energy absorbing member 22 installed in the space of the locker 10 is smaller in width than the energy absorbing member 20 in the first embodiment. The energy absorbing member 22 is fixed by welding a top plate portion 22A to the top plate portion 11A of the outer locker member 11. A fixing member 223 joined to a flange portion 22C of the energy absorbing member 22 does not abut against the top plate portion 12A of the inner locker member 12, but is disposed slightly spaced therefrom.

[0036] In this way, in the third embodiment, the fixing member 223 to which the flange 22C of the energy absorbing member 22 is joined is separated from the top plate 12A of the inner locker member 12 without abutting against it, and therefore it is possible to suppress the occurrence of defective products due to manufacturing errors. That is, it is possible to prevent a manufacturing error in which the dimension W1 in the width direction of the energy absorbing member 22 is larger than the dimension W2 in the width direction of the internal space of the locker 10, which makes it difficult to join the flange 11C of the outer locker member 11 and the flange 12C of the inner locker member 12. Therefore, in the third embodiment, it is possible to improve the manufacturing yield and suppress the manufacturing cost compared to the first embodiment. Note that the collision energy absorption amount in the third embodiment is reduced by the amount that the fixing member 223 to which the flange 22C of the energy absorbing member 22 is joined is separated from the top plate 12A of the inner locker member 12 without abutting against it, but the reduction in the collision energy absorption amount can be reduced by reducing the above-mentioned separation distance.

[0037] <Other embodiments> Although specific embodiments have been described above, the present invention is not limited to those appearances and configurations, and various modifications, additions, and deletions are possible. For example, in the above embodiment, an example of application to a locker of a vehicle body as an impact absorbing structure is shown, but the present invention can also be applied to center pillars, bumpers, and other structures other than lockers. In addition, in the above embodiment, the pair of vertical wall portions are arranged parallel to each other, but the pair of vertical wall portions may have an inclined shape in which the flange side is spaced apart from the top plate side.

[0038] <Effects of the above embodiments corresponding to each invention> Finally, the effects of the above-described embodiments corresponding to the second and subsequent inventions in the above-mentioned "Means for Solving the Problems" will be described below.

[0039] According to the second invention, since the pair of vertical wall portions are arranged parallel to each other, it becomes easier to position the energy absorbing member in accordance with the portion within the collision area of ​​the vehicle body that should absorb the collision load the most, compared to when the pair of vertical wall portions are formed in an inclined shape in which the flange portion side is spaced apart from the top plate portion side.

[0040] According to the third aspect of the present invention, the ratio of the fourth dimension to the third dimension of the hat shape is appropriately set, so that when the energy absorbing member is subjected to a collision load, the pair of vertical walls of the energy absorbing member do not deform so as to bend in the same direction, but rather deform in opposing directions to come into contact with each other, and then the expected deformation can be realized, in which the pair of vertical walls deform in opposing directions to come into contact with each other and then collapse.

[0041] In order for the energy absorbing member subjected to a collision load to undergo a planned deformation, the hat shape of the energy absorbing member needs to have the fourth dimension somewhat larger than the third dimension. Therefore, an elongated forming die is required to press-form the energy absorbing member. According to the fourth aspect of the present invention, the hat-shaped energy absorbing member is formed from two members joined at the top plate, so that an elongated forming die is not required to press-form the energy absorbing member, making manufacturing easier.

[0042] According to the fifth aspect of the present invention, the deformation strength of the vertical wall portion that receives the collision load from the top plate portion toward the flange portion of the energy absorbing member can be appropriately increased by the bead. Therefore, the amount of energy absorbed by the energy absorbing member can be appropriately controlled. In addition, the plate thickness of the energy absorbing member can be reduced by the amount of reinforcement by the bead, thereby making the energy absorbing member lighter. [Explanation of symbols]

[0043] 1. Shock absorbing structure 2. Paul 3 batteries 4th Floor 5 Side Door 6 Cross member 10. Lockers 11 Outer rocker member 12 Inner rocker member 11A, 12A Top plate 11B, 12B Vertical wall section 11C, 12C Tsubabe 20, 21, 22 Energy absorbing member 20A, 21A, 22A Top plate 20B Vertical wall section 20C, 21C, 22C Tsuba 20D, 20E joint part 20F Bead 201, 211, 221 Upper parts 202, 212, 222 Lower member 201A, 202A joint 223 Fixing member

Claims

1. The vehicle has an energy absorbing member extending in a direction intersecting an input direction of a collision load within a collision area of ​​the vehicle body and having a hat-shaped cross section along the input direction, The hat-shaped energy absorbing member includes a top plate portion, a pair of vertical wall portions, and a pair of flange portions, The top plate portion is disposed so that its plate surface faces the input direction, The pair of flanges are both fixed to a single fixing member that receives a collision load, Each of the flanges and each of the top plate portions connected to the pair of vertical wall portions are formed in a bent shape having an R surface portion or an inclined surface portion, Regarding the dimension of the bent shape of each of the joints in the direction in which each of the flanges extends, a first dimension of the bent shape on the flange side is equal to or greater than a second dimension of the bent shape on the top plate side, and the first dimension is equal to or greater than a predetermined value. Shock absorbing structure of the vehicle body.

2. In claim 1, The pair of vertical walls are arranged parallel to each other. Shock absorbing structure of the vehicle body.

3. In claim 2, The ratio of a fourth dimension, which is the distance between the top plate portion and the fixing member, to a third dimension, which is the distance between the pair of vertical wall portions, is set to 1:7 to 1:2.

5. Shock absorbing structure of the vehicle body.

4. In any one of claims 1 to 3, The energy absorbing member is composed of two members joined at the top plate portion of the hat shape. Shock absorbing structure of the vehicle body.

5. In any one of claims 1 to 3, The pair of vertical wall portions have a plurality of beads formed by recesses or protrusions extending in a direction in which the top plate portion and each of the flange portions face each other, along an extension direction of the energy absorbing member. Shock absorbing structure of the vehicle body.

Images