Rear body structure

Abstract

The present invention increases steering stability and ride comfort by suppressing displacement of the suspension (trailing arm) in the vehicle width direction.　There is provided, at a front end of a rear side member 10, a bottom wall flange portion 3810 which extends continuously from a bottom wall of the rear side member 10 toward the front of the vehicle and is overlapped on from below and joined to a bottom wall 1202 of a front cross member 12, the bottom wall flange portion 3810 having an extend flange portion 3812 which extends inward in the vehicle width direction from a sidewall of the rear side member 10 on the inside in the vehicle width direction and is joined to a bottom wall 12 of the front cross member 12.

Description

Technical Field

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[0001] The present invention relates to a rear body structure.

Background Art

[0002] There is known a rear body structure in which an arm support bracket is provided on a rear side member as a skeletal member constituting a vehicle body, and the front end of a trailing arm that constitutes a torsion beam type suspension device is supported by this arm support bracket. In this rear body structure, the rigidity of the joint portion is ensured by connecting the end portion of a cross member to the portion of the rear side member to which the arm support bracket is attached (see Patent Document 1). Therefore, when a lateral load is input to the rear side member via the arm support bracket with respect to the vehicle, this load is efficiently transmitted from the rear side member to the cross member.

Prior Art Documents

Patent Documents

[0003] [[ID=​​​​​​​​​​​​​​​In this case, it is disadvantageous in ensuring the rigidity of the rear side member where the arm support bracket is attached, and the lateral load applied to the rear side member via the arm support bracket causes the rear side member to tilt (twist) inward in the vehicle width direction, resulting in displacement of the suspension (trailing arm) in the vehicle width direction. Therefore, there is room for improvement in ensuring the vehicle's handling stability and ride comfort. This invention has been made in view of the above circumstances, and aims to provide a rear vehicle structure that is advantageous in improving handling stability and ride comfort by suppressing the displacement of the suspension (trailing arm) in the vehicle width direction. [Means for solving the problem]

[0005] To achieve the above objective, one embodiment of the present invention provides a rear body structure comprising: a pair of rear side members extending in the vehicle longitudinal direction at intervals in the vehicle width direction; a cross member extending in the vehicle width direction in front of the pair of rear side members and to which the front ends of the pair of rear side members are joined; and arm support brackets attached to each of the rear side members near the cross member and supporting the front end of a trailing arm, wherein the front end of the rear side member is provided with a bottom wall flange portion that extends forward from the bottom wall of the rear side member and is joined to the bottom wall of the cross member from below, and the bottom wall flange portion has an extended flange portion that extends inward in the vehicle width direction from the inner side wall of the rear side member in the vehicle width direction and is joined to the bottom wall of the cross member. [Effects of the Invention]

[0006] According to one embodiment of the present invention, the extended flange portion extends inward in the vehicle width direction from the bottom surface of the rear side member and is joined to the bottom surface of the cross member. This prevents the rear side member from tilting (twisting) inward in the vehicle width direction due to lateral loads applied to the rear side member via the arm support bracket. Therefore, it is possible to suppress the displacement of the suspension (trailing arm) in the vehicle width direction, which is advantageous in improving handling stability and ride comfort. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of the rear body structure according to the embodiment, as seen from below the vehicle. [Figure 2] This is a plan view of the rear structure of the vehicle body according to an embodiment. [Figure 3] This is a perspective view of the rear body structure according to an embodiment, showing the state with the front part of the rear side member, the main body of the rear side member, and the arm support bracket removed. [Figure 4] This is a perspective view of the rear body structure according to an embodiment, showing the state with the front part of the rear side member attached and the rear side member body and arm support bracket removed. [Figure 5] This is a perspective view of the rear body structure according to an embodiment, showing the front part of the rear side member, the main body of the rear side member, and the arm support bracket attached. [Modes for carrying out the invention]

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following diagrams, the symbol FR indicates the front of the vehicle, the symbol UP indicates the top of the vehicle, the symbol IN indicates the inside in the vehicle width direction, and the symbol OUT indicates the outside in the vehicle width direction. As shown in Figures 1 and 2, the rear body structure of this embodiment is composed of a torsion beam type suspension device 22 including a pair of rear side members 10, a pair of side sills 11, a front cross member 12, a rear cross member 14, a floor panel 16, a pair of floor side members 18, and a pair of arm support brackets 20. Each rear side member 10 is spaced apart in the vehicle width direction and extends in the vehicle's longitudinal direction. Each rear side member 10 comprises a bottom wall 1002 and a pair of side walls 1004 erected upward from both sides of the bottom wall 1002 in the vehicle width direction. A pair of side sills 11 extend in the longitudinal direction of the vehicle on the outer side in the vehicle width direction of the rear side member 10, and the rear part of the side sills 11 is positioned adjacent to the front end of the rear side member 10.

[0009] The front cross member 12 extends in the vehicle width direction in front of the pair of rear side members 10, and the front ends of the pair of rear side members 10 are joined to it. The front cross member 12 comprises a bottom wall 1202 and a pair of side walls 1204 erected upward from both sides of the bottom wall 1202 in the vehicle width direction. The rear cross member 14 extends in the vehicle width direction behind the front cross member 12, and both ends are connected to a pair of rear side members 10. The rear cross member 14 comprises a bottom wall 1402 and a pair of side walls 1404 erected upward from both sides of the bottom wall 1402 in the vehicle width direction.

[0010] The floor panel 16 consists of a front floor panel 16A and a rear floor panel 16B located behind it. The front floor panel 16A extends forward from the front cross member 12, and the rear floor panel 16B extends rearward from the front cross member 12. A pair of floor side members 18 extending in the longitudinal direction of the vehicle are provided at intervals in the vehicle width direction of the front floor panel 16A, and the rear of each floor side member 18 is joined to the bottom wall 1202 of the front cross member 12 by overlapping it from below. Therefore, the pair of floor side members 18 extend in the vehicle longitudinal direction, positioned forward of the rear side member 10 in the vehicle longitudinal direction, and spaced apart in the vehicle width direction. When viewed from the front of the vehicle, the pair of floor side members 18 are located inward in the vehicle width direction compared to the pair of rear side members 10.

[0011] The rear floor panel 16B is provided across the upper ends of the pair of side walls 1004 of each rear side member 10, the upper ends of the pair of side walls 1204 of the front cross member 12, and the upper ends of the pair of side walls 1404 of the rear cross member 14. The rear floor panel 16B forms a closed cross-sectional structure between the pair of rear side members 10, the front cross member 12, and the rear cross member 14, respectively.

[0012] As shown in FIG. 1, the torsion beam type suspension device 22 suspends the rear wheels 32 with respect to the rear side members 10, and includes a pair of trailing arms 24, a torsion beam 26, a pair of arm support brackets 20, a pair of coil springs 28, and a pair of shock absorbers 30. Each trailing arm 24 has its front end swingably supported by the arm support bracket 20 via a bush 21, and its rear end supports the rear wheel 32 via an axle. Each arm support bracket 20 is attached to each rear side member 10 in the vicinity behind the front cross member 12. The torsion beam 26 extends in the vehicle width direction and its both ends are connected to the pair of trailing arms 24. Each coil spring 28 is provided between the trailing arm 24 and the rear side member 10, respectively. A spring seat 2802 for supporting the upper end of the coil spring 28 is provided on the bottom wall 1002 of the rear side member 1 ten, and a spring receiver 2804 for supporting the lower end of the coil spring 28 is provided on the trailing arm 24. Also, shock absorbers 30 are provided between the trailing arms 24 and the rear side members 10, respectively.

[0013] Next, the front cross member 12, the rear side member 10, and the arm support bracket 20 will be specifically described. As shown in FIG. 3, reinforcements 34 are provided inside both ends in the vehicle width direction of the front cross member 12. Specifically, the reinforcement 34 is provided to extend in the vehicle width direction along the ridge line 1210 at the corner of the bottom wall 1202 of the front cross member 12 and the rear side wall 1204A of the front cross member 12. The reinforcement 34 is formed in an L-shaped cross section having a lower plate portion 3402 that is overlapped with the bottom wall 1202 of the front cross member 12 and a rear plate portion 3404 that stands up from the lower plate portion 3402 and is overlapped with the rear side wall 1204A of the front cross member 12, and is provided so as to straddle the ridge line 1210 inside the corner of the front cross member 34. Further, the lower plate portion 3402 of the reinforcement 34 is overlapped and joined to the rear portion 18A of the floor side member 18 via the bottom wall 1202 of the front cross member 12.

[0014] As shown in FIGS. 4 and 5, the rear side member 10 includes a rear side member main body 36 provided with an arm support bracket 20 and extending in the vehicle front-rear direction, and a rear side member front portion 38 coupled to the front portion of the rear side member main body 36 and connecting the rear side member main body 36 and the front cross member 12. <​​​​​​​​The front part 38 of the rear side member is composed of a bottom wall 3802 and a pair of side walls 3804, as well as a bottom wall flange portion 3810 and an extension flange portion 3812. As described above, the bottom wall 3602 and the pair of side walls 3804 of the rear side member body 36 are joined to the rear of the bottom wall 3802 and the pair of side walls 3804 of the front part 38 of the rear side member by overlapping them outwards. In other words, the front end of the rear side member 38 is provided with a bottom wall flange portion 3810 that extends forward from the bottom wall 1002 of the rear side member 10 and is joined to the bottom wall 1202 of the front cross member 12 by overlapping it from below. The bottom wall flange portion 3810 has an extended flange portion 3812 that extends inward in the vehicle width direction from the inner side wall 1004 of the rear side member 10 in the vehicle width direction and is joined to the bottom wall 1202 of the front cross member 12 by overlapping it from below. The extended flange portion 3812 extends inward in the vehicle width direction along the ridge line 1210 of the corner formed by the bottom wall 1202 and the rear side wall 1204A of the front cross member 12. As shown in Figure 4, the extension flange portion 3812 is connected to the reinforcement 34. More specifically, the extension flange portion 3812 is superimposed on the bottom wall 1202 of the front cross member 12 and the lower plate portion 3402 of the reinforcement 34, and is connected in a triple layer configuration. The bottom wall flange portion 3810 has approximately the same width in the vehicle width direction as the bottom wall 3802 of the front rear side member 38, extends forward from the bottom wall 3802 of the front rear side member 38, and is joined to the bottom wall 1202 of the front cross member 12 by overlapping it from below. The bottom wall flange portion 3810 has a length that extends from the rear end of the bottom wall 1202 of the front cross member 12 to the middle portion of the bottom wall 1202 in the front-rear direction. The extended flange portion 3812 extends from the inner end of the bottom wall flange portion 3810 in the vehicle width direction, and as viewed from the front of the vehicle, it extends inward beyond the contour of the rear side member 10 in the vehicle width direction. The width of the extension flange portion 3812 is formed to a dimension that extends to the vicinity of the floor side member 18. Furthermore, the extended flange portion 3812 has a length that extends from the rear end of the bottom wall 1202 of the front cross member 12 to the middle portion of the bottom wall 1202 in the front-rear direction. Furthermore, the rear portion 18A of each floor side member 18 is joined to the bottom wall 1202 of the front cross member 12 by overlapping it from below near the inner side in the vehicle width direction of the extension flange portion 3812. In the figure, reference numeral 3820 indicates a flange that rises inward in the vehicle width direction from the front end of the inner wall 3804A of the pair of side walls 3804 of the front rear side member 38 and is joined to the rear side wall 1204A of the front cross member 12, and reference numeral 3822 indicates a flange that rises inward in the vehicle width direction from the upper end of the inner wall 3804A of the front rear side member 38 and is joined to the rear floor panel 16B.

[0016] As shown in Figure 5, the arm support bracket 20 is composed of a mounting portion 40 that is attached to the rear side member 10 and a pair of support plate portions 42 that are spaced apart and facing each other in the vehicle width direction. The pair of support plate portions 42 are located between them to support the bush 21 provided at the front end of the trailing arm 24. The mounting section 40 is composed of a rear panel section 4002, an intermediate panel section 4004, and a front panel section 4006. The rear panel section 4002 is located at the rear of the upper end of the pair of support plate sections 42, from the middle to the rear. The intermediate panel section 4004 connects the front edges of the pair of support plate sections 42. The front panel section 4006 extends forward from the upper edge of the intermediate panel section 4004. The rear panel section 4002 is joined from the bottom wall 1002 of the rear side member 10 (bottom wall 3602 of the side member body 36) to a pair of side walls 1004 (side walls 3604 of the side member body 36). The front panel section 4006 is joined to the bottom wall 1004 of the rear side member 10 (the bottom wall 3604 of the side member body 36) by overlapping it from below. To explain in detail, the front panel section 4006 is joined to the bottom wall 3602 of the rear side member body 36 and the bottom wall 3802 of the front part 38 of the rear side member by overlapping them in a triple layer.

[0017] Next, I will explain the effects and benefits. In this embodiment, the front end of the rear side member 10 is provided with a bottom wall flange portion 3810 that extends forward from the bottom wall 1002 of the rear side member 10 and is joined to the bottom wall 1202 of the front cross member 12 by overlapping it from below. The bottom wall flange portion 3810 has an extended flange portion 3812 that extends inward in the vehicle width direction from the inner side wall 1004 of the rear side member 10 in the vehicle width direction and is joined to the bottom wall 12 of the front cross member 12. Therefore, since the extended flange portion 3812 extends inward in the vehicle width direction from the bottom wall 1202 of the rear side member 10 and is joined to the bottom wall 1202 of the front cross member 12, it is advantageous in suppressing the rear side member 10 from tilting (twisting) inward in the vehicle width direction due to lateral loads input to the rear side member 10 via the arm support bracket 20. Therefore, suppressing the displacement of the suspension (trailing arm 24) in the vehicle width direction is advantageous in improving handling stability and ride comfort. Furthermore, even when the arm support bracket 20 is spaced apart from the front cross member 12 in the longitudinal direction of the vehicle, it is advantageous for efficiently transmitting load from the rear side member 10 to the front cross member 12, which is advantageous for improving handling stability and ride comfort. In other words, the extended flange portion 3812 protrudes inward in the vehicle width direction from the inner end of the bottom wall flange portion 3810 in the vehicle width direction and is superimposed on and joined to the bottom wall 1202 of the front cross member 12 from below. In other words, both the bottom wall flange portion 3810 and the extension flange portion 3812 have a width in the vehicle's longitudinal direction and extend in the vehicle's width direction. Therefore, since both the bottom wall flange portion 3810 and the extension flange portion 3812 extend parallel to each other with respect to the lateral load input from the arm support bracket 20 to the rear side member 10 (in other words, the lateral load is received within the planes of both the bottom wall flange portion 3810 and the extension flange portion 3812), it is advantageous in increasing the rigidity of the rear side member 10 against lateral loads.

[0018] Furthermore, in this embodiment, the rear portions of a pair of side sills 11 that extend in the longitudinal direction of the vehicle on the outer side in the vehicle width direction of the rear side member 10 are positioned adjacent to the front end of the rear side member 10. Therefore, having the front end of the rear side member 10 adjacent to the side sill 11 is advantageous in suppressing the rear side member 10 from tilting (twisting) inward in the vehicle width direction due to lateral loads input to the rear side member 10 via the arm support bracket 20, and is advantageous in improving handling stability and ride comfort by suppressing the displacement of the suspension (trailing arm 24) in the vehicle width direction.

[0019] Furthermore, in this embodiment, the extended flange portion 3812 extends inward in the vehicle width direction along the ridge line 1210 of the corner formed by the bottom wall 1202 of the front cross member 12 and the rear side wall 1204A located on the rear side of the vehicle of the front cross member 12. Therefore, this is advantageous in efficiently transmitting the lateral load input from the rear side member 10 via the arm support bracket 20 to the front cross member 12 via the extension flange portion 3812 to the ridge line 1210 of the corner of the front cross member 12. Therefore, the rigidity of the rear side member 10 can be increased against lateral loads applied to it, which is advantageous in suppressing the rear side member 10 from tilting (twisting) inward in the vehicle width direction, and is advantageous in improving handling stability and ride comfort by suppressing the displacement of the suspension (trailing arm 24) in the vehicle width direction.

[0020] Furthermore, in this embodiment, a reinforcement 34 is provided at the corner between the bottom wall 1202 of the front cross member 12 and the rear side wall 1204A of the front cross member 12, extending in the vehicle width direction along the ridge line 1210 of the corner, and the extended flange portion 3812 is connected to the reinforcement 34. Therefore, it is more advantageous in efficiently transmitting the lateral load input from the rear side member 10 via the arm support bracket 20 and the extension flange portion 3812 to the reinforcement 34 that reinforces the corner (ridge line 1210) of the front cross member 12. Therefore, the rigidity of the rear side member 10 can be increased against lateral loads applied to it, which is advantageous in suppressing the rear side member 10 from tilting (twisting) inward in the vehicle width direction, and is advantageous in improving handling stability and ride comfort by suppressing the displacement of the suspension (trailing arm 24) in the vehicle width direction.

[0021] Furthermore, in this embodiment, the reinforcement 34 is formed in an L-shape in cross-section, having a lower plate portion 3402 that overlaps the bottom wall 1202 of the front cross member 12, and a rear plate portion 3404 that rises from the lower plate portion 3402 and overlaps the rear side wall 1204A of the front cross member 12. It is provided so as to straddle the ridge line 1210 on the inside of the corner of the front cross member 12, and the extension flange portion 3810 is overlapped with the bottom wall 1202 and the lower plate portion 3404 of the front cross member 12 and joined in a triple-layered configuration. Therefore, the corners (ridges 1210) of the front cross member 12 can be more reliably reinforced with the reinforcement 34, which is even more advantageous in efficiently transmitting the lateral load input from the rear side member 10 via the extended flange portion 3812 to the reinforcement 34. Therefore, this is advantageous in increasing the rigidity of the rear side member 10 against lateral loads applied to it, in suppressing the rear side member 10 from tilting (twisting) inward in the vehicle width direction, and in further improving handling stability and ride comfort by suppressing the displacement of the suspension (trailing arm 24) in the vehicle width direction.

[0022] Furthermore, in this embodiment, a pair of floor side members 18 are provided in front of the rear side member 10 and inward in the vehicle width direction from the rear side member 10, with a gap in the vehicle width direction between them and extending in the vehicle longitudinal direction. The rear portion of each floor side member 18 is superimposed and joined to the bottom wall 1202 of the front cross member 12 from below, and the reinforcement 34 is connected to the rear portion 18A of the floor side member 18. Therefore, the lateral load applied to the rear side member 10 can be efficiently transmitted to the floor side member 18 via the reinforcement 34 in addition to the front cross member 12, which is advantageous in increasing the rigidity of the rear side member 10 and is advantageous in improving handling stability and ride comfort by suppressing the displacement of the suspension (trailing arm 24) in the vehicle width direction.

[0023] Furthermore, in this embodiment, the front panel portion 4006 of the mounting portion 40 of the arm support bracket 20 is superimposed on the bottom wall 3602 of the rear side member body 36 and the bottom wall 3802 of the front portion 38 of the rear side member, and joined together in a triple layer. Therefore, this is even more advantageous in efficiently transmitting the lateral load input from the arm support bracket 20 to the rear side member 10 to the front cross member 12. Therefore, the mounting rigidity of the arm support bracket 20 can be further increased, and by suppressing the displacement of the suspension (trailing arm 24) in the vehicle width direction, it becomes more advantageous in improving handling stability and ride comfort.

[0024] In this embodiment, the rear side member 10 is composed of a rear side member body 36 and a rear side member front portion 38, but the rear side member 10 may also be constructed as a single integrated unit. However, in this embodiment, when the rear side member 10 is composed of a rear side member body 36 extending in the longitudinal direction of the vehicle and a rear side member front portion 38 connected to the front of the rear side member body 36, it is advantageous in improving handling stability and ride comfort without increasing the weight of the vehicle body by changing the thickness of both plates. In other words, the load applied laterally from the arm support bracket 20 to the rear side member 10 is transmitted to the front cross member 12 via the bottom wall flange portion 3810 and the extension flange portion 3812 of the front part 38 of the rear side member. Here, in order to efficiently transmit the lateral load input from the arm support bracket 20 to the front cross member 12, in other words, in order to increase the rigidity of the portion of the rear side member 10 from the arm support bracket 20 to the front cross member 12, it is sufficient to ensure a large thickness in the front part 38 of the rear side member located near the front of the arm support bracket 20, and the thickness of the rear side member body 36 may be set to be smaller than the thickness of the front part 38 of the rear side member. Therefore, compared to the case where the rear side member 10 is integrally constructed and a large plate thickness is secured for the rear side member 10, it is possible to increase the rigidity of the rear side member 10 against lateral loads input from the arm support bracket 20 without increasing the weight of the vehicle body. [Explanation of Symbols]

[0025] 10 Rear side member 1002 Bottom wall 1004 Side wall 11 Side sill 12 Front cross member (cross member) 1202 Bottom wall 1204 Side wall 1204A Rear wall 1210 Ridge 14 Rear cross member 1402 Bottom wall 1404 Side wall 16 Floor Panels 16A Front Floor Panel 16B Rear Floor Panel 18 Floor side member 18A Rear 20 Arm support brackets 21 Bush 22 Torsion beam type suspension system 24 Trailing Arms 26 Torsion beam 28 Coil Springs 2802 Spring Seat 2804 Spring receiver 30 Shock absorbers 32 Rear wheels 34 Reinforce 3402 Lower plate part 3404 Rear plate part 36 Rear side member body 3602 Bottom wall 3604 Side wall 38 Rear side member front 3802 Bottom wall 3804 Side wall 3804A Inner wall 3810 Bottom wall flange section 3812 Extension flange section 3820 Flange 3822 Flange 40 Mounting part 4002 Rear panel section 4004 Intermediate panel section 4006 Front Panel 42 Support plate part

Claims

1. A pair of rear side members extending in the front-to-rear direction of the vehicle, spaced apart in the width direction of the vehicle, A cross member extending in the vehicle width direction at the front of the pair of rear side members and to which the front ends of the pair of rear side members are joined, A rear body structure comprising: an arm support bracket attached to each of the rear side members near the cross member and supporting the front end of the trailing arm, The front end of the rear side member is provided with a bottom wall flange portion that extends forward from the bottom wall of the rear side member and is joined to the bottom wall of the cross member by overlapping it from below. The bottom wall flange portion has an extended flange portion that extends inward in the vehicle width direction from the inner side wall of the rear side member in the vehicle width direction and is joined to the bottom wall of the cross member. A pair of floor side members are provided in front of the rear side member and inward in the vehicle width direction from the rear side member, with a gap in the vehicle width direction between them, extending in the vehicle longitudinal direction, and their rear ends being joined to the cross member. A rear body structure characterized by the following.

2. The rear side member is provided with a pair of side sills that extend in the longitudinal direction of the vehicle on the outer side in the vehicle width direction, The rear portion of the side sill is positioned adjacent to the front end of the rear side member. The rear body structure of the vehicle according to claim 1, characterized in that it is as described above.

3. The extended flange portion extends inward in the vehicle width direction along the ridge of the corner formed by the bottom wall of the cross member and the rear side wall located on the rear side of the vehicle of the cross member. The rear body structure of a vehicle according to claim 1 or 2, characterized in that it is as described above.

4. At the corner between the bottom wall and the rear side wall of the cross member, a reinforcement is provided that extends in the vehicle width direction along the ridge of the corner. The extension flange portion is connected to the reinforcement. The rear body structure of the vehicle according to claim 3, characterized in that it is as described above.

5. The reinforcement is formed in an L-shape in cross-section, having a lower plate portion that overlaps the bottom wall of the cross member and a rear plate portion that rises from the lower plate portion and overlaps the rear side wall of the cross member, and is provided so as to straddle the ridge line on the inside of the corner of the cross member. The extension flange portion is superimposed on the bottom wall of the cross member and the lower plate portion, and joined together in a triple layer. The rear body structure of the vehicle according to feature 4.

6. The rear portion of each floor side member is joined to the bottom wall of the cross member from below, The reinforcement is coupled to the rear of the floor side member. The rear body structure of the vehicle according to feature 4.

7. The rear side member comprises a rear side member body on which the arm support bracket is provided, and a rear side member front portion which is coupled to the front of the rear side member body and connects the rear side member body and the cross member. The bottom wall flange portion extends forward from the bottom wall of the front part of the rear side member. The rear body structure of the vehicle according to claim 1, characterized in that it is as described above.

8. The rear side member body and the front part of the rear side member are joined by the bottom wall and pair of side walls of the rear side member body overlapping and joining them to the outside of the bottom wall and pair of side walls of the front part of the rear side member. The arm support bracket has a mounting portion that is attached to the rear side member, The mounting portion includes a front panel portion that is joined to the bottom wall of the rear side member body. The front panel is joined to the bottom wall of the rear side member body and the bottom wall of the front part of the rear side member in a three-layered configuration. The rear body structure of the vehicle according to claim 7, characterized by its features.

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