Vehicle body rear 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

Rear body structure

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

[0002] A vehicle rear structure is known in which an arm support bracket is provided on a rear side member, which serves as a frame member of the vehicle body, and the arm support bracket supports the front end of a trailing arm that constitutes a torsion beam suspension system. In this vehicle rear structure, the end of a cross member is connected to the rear side member where the arm support bracket is attached, thereby ensuring rigidity at the connection point (see Patent Document 1). Therefore, when a load from the side of the vehicle is applied to the rear side member through the arm support bracket, the load is efficiently transmitted from the rear side member to the cross member.

[0003] JP 2017-190124 A

[0004] However, due to layout considerations, it may be necessary to position the connection point of the cross member to the rear side member in a location away from the arm support bracket in the vehicle longitudinal direction. In this case, it is disadvantageous in ensuring the rigidity of the rear side member where the arm support bracket is attached. Furthermore, lateral loads input to the rear side member via the arm support bracket can cause 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, leaving room for improvement in ensuring vehicle handling stability and ride comfort. The present invention has been made in consideration of the above circumstances, and its object is to provide a rear vehicle body structure that is advantageous in improving handling stability and ride comfort by suppressing displacement of the suspension (trailing arm) in the vehicle width direction.

[0005] In order to achieve the above-mentioned object, one embodiment of the present invention is a rear body structure comprising a pair of rear side members extending in the fore-and-aft direction of the vehicle at a distance 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 connected, and an arm support bracket 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 continuously from the bottom wall of the rear side member forward of the vehicle and is overlapped and joined from below to the bottom wall of the cross member, and the bottom wall flange portion has an extended flange portion that extends more inward in the vehicle width direction than the inner side wall of the rear side member and is joined to the bottom wall of the cross member.

[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, thereby preventing the rear side member from tipping (twisting) inward in the vehicle width direction due to a lateral load input to the rear side member via the arm support bracket. This prevents displacement of the suspension (trailing arm) in the vehicle width direction, which is advantageous in improving handling stability and ride comfort.

[0007] Fig. 1 is a perspective view of a vehicle rear structure according to an embodiment, as seen from below the vehicle. Fig. 2 is a plan view of the vehicle rear structure according to an embodiment. Fig. 3 is a perspective view of the vehicle rear structure according to an embodiment, showing a state in which the front portions of the rear side members, the rear side member main body, and the arm support brackets have been removed. Fig. 4 is a perspective view of the vehicle rear structure according to an embodiment, showing a state in which the front portions of the rear side members have been attached and the rear side member main body and the arm support brackets have been removed. Fig. 5 is a perspective view of the vehicle rear structure according to an embodiment, showing a state in which the front portions of the rear side members, the rear side member main body, and the arm support brackets have been attached.

[0008] An embodiment of the present invention will now be described with reference to the drawings. In the following drawings, the symbol FR indicates the front of the vehicle, the symbol UP indicates the upper side of the vehicle, the symbol IN indicates the inward side in the vehicle width direction, and the symbol OUT indicates the outward side in the vehicle width direction. As shown in FIGS. 1 and 2 , the rear vehicle body structure of this embodiment includes 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 torsion beam suspension system 22 including a pair of arm support brackets 20. The rear side members 10 are spaced apart in the vehicle width direction and extend in the fore-and-aft direction of the vehicle. Each rear side member 10 includes a bottom wall 1002 and a pair of side walls 1004 extending upward from both sides of the bottom wall 1002 in the vehicle width direction. The pair of side sills 11 extend in the fore-and-aft direction of the vehicle on the outer sides of the rear side members 10 in the vehicle width direction, with the rear portions of the side sills 11 positioned adjacent to the front ends of the rear side members 10.

[0009] The front cross member 12 extends in the vehicle width direction in front of the pair of rear side members 10, and is joined to the front ends of the pair of rear side members 10. The front cross member 12 includes 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 of the rear cross member 14 are joined to the pair of rear side members 10. The rear cross member 14 includes 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 includes 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 fore-and-aft direction of the vehicle are provided at locations spaced apart in the vehicle width direction of the front floor panel 16A, and the rear portions of each floor side member 18 are overlapped and joined from below to the bottom wall 1202 of the front cross member 12. Therefore, the pair of floor side members 18 extend in the fore-and-aft direction of the vehicle, spaced apart in the vehicle width direction, forward of the rear side members 10. When viewed from the front of the vehicle, the pair of floor side members 18 are located inward in the vehicle width direction of 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 each of the pair of rear side members 10, the front cross member 12, and the rear cross member 14.

[0012] As shown in FIG. 1 , the torsion beam suspension device 22 suspends a rear wheel 32 from the rear side member 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 bushing 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 near the rear of the front cross member 12. The torsion beam 26 extends in the vehicle width direction, and both ends of the torsion beam 26 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. A spring seat 2802 that supports the upper end of coil spring 28 is provided on bottom wall 1002 of rear side member 10, and a spring receiver 2804 that supports the lower end of coil spring 28 is provided on trailing arm 24. In addition, shock absorbers 30 are provided between trailing arms 24 and rear side members 10, respectively.

[0013] Next, the front cross member 12, rear side member 10, and arm support bracket 20 will be described in detail. As shown in Figure 3, the front cross member 12 is provided with reinforcements 34 inside both ends of the front cross member 12 in the vehicle width direction. More specifically, the reinforcements 34 are provided to extend in the vehicle width direction along a ridge line 1210 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. The reinforcements 34 are formed with an L-shaped cross section and include a lower plate portion 3402 that is overlaid on 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 is overlaid on the rear side wall 1204A of the front cross member 12. The reinforcements 34 are provided so as to straddle the ridge line 1210 inside the corner of the front cross member 34. In addition, 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 Figures 4 and 5, the rear side member 10 includes a rear side member main body 36 that is provided with the arm support bracket 20 and extends in the fore-and-aft direction of the vehicle, and a rear side member front portion 38 that is joined to the front portion of the rear side member main body 36 to connect the rear side member main body 36 and the front cross member 12. The rear side member main body 36 and the rear side member front portion 38 each include bottom walls 3602, 3802 located at their lower portions and a pair of side walls 3604, 3804 that rise from both ends of the bottom walls 3602, 3802. The front end of the rear side member main body 36 is located at a position spaced rearward of the front cross member 12. Although the front end of the rear side member main body 36 may be joined to the front cross member 12, locating the front end of the rear side member main body 36 at a position spaced rearward of the front cross member 12, as in this embodiment, is advantageous in terms of reducing the weight of the rear side member main body 36. The rear side member main body 36 and the rear side member front portion 38 are joined by overlapping the bottom wall 3602 and the pair of side walls 3604 of the rear side member main body 36 on the outsides of the bottom wall 3802 and the pair of side walls 3804 of the rear side member front portion 38.

[0015] The rear side-member front portion 38 includes a bottom wall 3802, a pair of side walls 3804, a bottom wall flange portion 3810, and an extended flange portion 3812. As described above, the bottom wall 3602 and the pair of side walls 3804 of the rear side-member main body 36 are joined to the rear portion of the bottom wall 3802 and the rear portion of the pair of side walls 3804 of the rear side-member front portion 38 in an overlapping relationship with each other. That is, the front end of the rear side member 38 is provided with a bottom wall flange portion 3810 that extends continuously from the bottom wall 1002 of the rear side member 10 toward the front of the vehicle and is joined to the bottom wall 1202 of the front cross member 12 in an overlapping relationship from below. The bottom wall flange portion 3810 has an extended flange portion 3812 that extends more inward in the vehicle width direction than the inner side wall 1004 of the rear side member 10 and is joined to the bottom wall 1202 of the front cross member 12 in an overlapping relationship from below. The extended flange portion 3812 extends inward in the vehicle width direction along a ridge line 1210 of a corner formed by the bottom wall 1202 and rear side wall 1204A of the front cross member 12. As shown in Figure 4, the extended flange portion 3812 is connected to the reinforcement 34, and more specifically, the extended flange portion 3812 is overlapped and joined in three pieces to the bottom wall 1202 of the front cross member 12 and the lower plate portion 3402 of the reinforcement 34. The bottom wall flange portion 3810 has approximately the same width in the vehicle width direction as the bottom wall 3802 of the rear side member front portion 38, extends forward from the bottom wall 3802 of the rear side member front portion 38, and is overlapped and joined to the bottom wall 1202 of the front cross member 12 from below. The bottom wall flange portion 3810 has a length that extends from the vehicle rear end of the bottom wall 1202 of the front cross member 12 to a portion that exceeds the midpoint in the fore-aft direction of the bottom wall 1202 of the front cross member 12. The extended flange portion 3812 extends from the vehicle width directional inner end of the bottom wall flange portion 3810 to a portion that is laterally inward in the vehicle width direction than the outline of the rear side member 10 when viewed from the front of the vehicle. The width of the extended flange portion 3812 is formed with a dimension that extends to the vicinity of the floor side member 18. In addition, the extended flange portion 3812 has a length that extends from the vehicle rear end of the bottom wall 1202 of the front cross member 12 to a portion that extends in the fore-aft direction of the bottom wall 1202 of the front cross member 12.Furthermore, the rear portion 18A of each floor side member 18 is overlapped from below and joined to the bottom wall 1202 of the front cross member 12 near the vehicle width directional inner side of the extended flange portion 3812. In the drawings, reference numeral 3820 denotes a flange that rises inward in the vehicle width direction from the front end of the inner wall 3804A, which is the innermost one of the pair of side walls 3804 of the rear side member front portion 38, and is joined to the rear side wall 1204A of the front cross member 12, and reference numeral 3822 denotes a flange that rises inward in the vehicle width direction from the upper end of the inner wall 3804A of the rear side member front portion 38 and is joined to the rear floor panel 16B.

[0016] As shown in FIG. 5 , the arm support bracket 20 includes a mounting portion 40 attached to the rear side member 10 and a pair of support plate portions 42 spaced apart in the vehicle width direction and facing each other. The pair of support plate portions 42 support a bushing 21 provided at the front end of the trailing arm 24 between them. The mounting portion 40 includes a rear panel portion 4002, an intermediate panel portion 4004, and a front panel portion 4006. The rear panel portion 4002 is located at the front-rear intermediate portion to the rear portion of the upper ends of the pair of support plate portions 42. The intermediate panel portion 4004 connects the front edges of the pair of support plate portions 42. The front panel portion 4006 extends forward from the upper edge of the intermediate panel portion 4004. The rear panel portion 4002 is joined from the bottom wall 1002 (the bottom wall 3602 of the side member main body 36) of the rear side member 10 to the pair of side walls 1004 (the side walls 3604 of the side member main body 36). The front panel portion 4006 is overlapped and joined from below to the bottom wall 1004 of the rear side member 10 (the bottom wall 3604 of the side member main body 36). More specifically, the front panel portion 4006 is overlapped and joined to the bottom wall 3602 of the rear side member main body 36 and the bottom wall 3802 of the rear side member front portion 38 in a three-layer configuration.

[0017] Next, the effects will be described. In the present embodiment, a bottom wall flange portion 3810 is provided at the front end of rear side member 10, extending continuously from bottom wall 1002 of rear side member 10 toward the front of the vehicle and overlapping and joined to bottom wall 1202 of front cross member 12 from below, and bottom wall flange portion 3810 has an extended flange portion 3812 that extends more inward in the vehicle width direction than the inner side wall 1004 of rear side member 10 and is joined to bottom wall 1202 of front cross member 12. Therefore, because extended flange portion 3812 extends more inward in the vehicle width direction than bottom wall 1202 of rear side member 10 and is joined to bottom wall 1202 of front cross member 12, this is advantageous in preventing rear side member 10 from tipping (twisting) inward in the vehicle width direction due to a lateral load input to rear side member 10 via arm support bracket 20. Therefore, suppressing displacement of the suspension (trailing arm 24) in the vehicle width direction is advantageous in improving handling stability and ride comfort. Furthermore, even if the arm support bracket 20 is spaced apart from the front cross member 12 in the vehicle fore-and-aft direction, this is advantageous in efficiently transmitting load from the rear side member 10 to the front cross member 12, which is advantageous in 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 and is overlapped and joined from below to the bottom wall 1202 of the front cross member 12. In other words, both the bottom wall flange portion 3810 and the extended flange portion 3812 have a width in the vehicle fore-and-aft direction and extend in the vehicle width direction. Therefore, since both the bottom wall flange portion 3810 and the extension flange portion 3812 extend parallel 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), this is advantageous in increasing the rigidity of the rear side member 10 against lateral loads.

[0018] In addition, in the present embodiment, rear portions of a pair of side sills 11 extending in the vehicle front-rear direction on the outer sides of rear side member 10 in the vehicle width direction are disposed adjacent to the front ends of rear side member 10. Therefore, having the front ends of rear side member 10 adjacent to side sills 11 is more advantageous in suppressing the rear side member 10 from tipping (twisting) inward in the vehicle width direction due to a lateral load input to rear side member 10 via arm support bracket 20, and is more advantageous in improving handling stability and ride comfort by suppressing 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 vehicle rear side of the front cross member 12. This is advantageous for efficiently transmitting the lateral load input from the rear side member 10 via the arm support bracket 20 to the ridge line 1210 of the corner of the front cross member 12 through the extended flange portion 3812. This makes it possible to further increase the rigidity of the rear side member 10 against the lateral load input to the rear side member 10, which is advantageous for preventing the rear side member 10 from tipping (twisting) inward in the vehicle width direction, and by suppressing displacement of the suspension (trailing arm 24) in the vehicle width direction, is more advantageous for improving handling stability and ride comfort.

[0020] Furthermore, in this embodiment, a reinforcement 34 extending in the vehicle width direction along a ridge line 1210 of the corner 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, and the extended flange portion 3812 is connected to the reinforcement 34. This is advantageous in efficiently transmitting a lateral load input from the rear side member 10 via the arm support bracket 20 through the extended flange portion 3812 to the reinforcement 34 reinforcing the corner (ridge line 1210) of the front cross member 12. This makes it possible to further increase the rigidity of the rear side member 10 against a lateral load input to the rear side member 10, which is advantageous in suppressing the rear side member 10 from tipping (twisting) inward in the vehicle width direction, and by suppressing displacement of the suspension (trailing arm 24) in the vehicle width direction, is advantageous in improving handling stability and ride comfort.

[0021] Furthermore, in this embodiment, the reinforcement 34 is formed with an L-shaped cross section having a lower plate portion 3402 that is overlapped on 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, and is provided so as to straddle the ridge line 1210 inside the corner of the front cross member 12, and the extended flange portion 3810 is overlapped on the bottom wall 1202 and the lower plate portion 3404 of the front cross member 12 and joined in a three-layer configuration. Therefore, the corner (ridge line 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 even more advantageous in increasing the rigidity of the rear side member 10 against lateral loads input to the rear side member 10, and is advantageous in preventing the rear side member 10 from tipping (twisting) inward in the vehicle width direction, and by suppressing displacement of the suspension (trailing arm 24) in the vehicle width direction, this is even more advantageous in improving handling stability and ride comfort.

[0022] Furthermore, in this embodiment, a pair of floor side members 18 are provided in front of the rear side member 10 and on the inner side of the rear side member 10 in the vehicle width direction, spaced apart in the vehicle width direction and extending in the fore-and-aft direction of the vehicle, and the rear portion of each floor side member 18 is overlapped and joined from below to the bottom wall 1202 of the front cross member 12, and the reinforcement 34 is connected to the rear portion 18A of the floor side member 18. Therefore, the lateral load input to the rear side member 10 can be efficiently transmitted via the reinforcement 34 to the floor side member 18 in addition to the front cross member 12, which is more advantageous in terms of increasing the rigidity of the rear side member 10 and is more advantageous in terms of improving handling stability and ride comfort by suppressing 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 overlapped with the bottom wall 3602 of the rear side member main body 36 and the bottom wall 3802 of the rear side member front portion 38, and joined in a triple-layer configuration. This is therefore 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. This makes it possible to further increase the mounting rigidity of the arm support bracket 20 and suppress displacement of the suspension (trailing arm 24) in the vehicle width direction, which is even more advantageous in improving handling stability and ride comfort.

[0024] In the present embodiment, the rear side member 10 is configured with the rear side member main body 36 and the rear side member front portion 38, but the rear side member 10 may also be configured as an integrated unit. However, when the rear side member 10 is configured with the rear side member main body 36 extending in the vehicle longitudinal direction and the rear side member front portion 38 joined to the front portion of the rear side member main body 36, as in the present embodiment, it is advantageous in improving handling stability and ride comfort without increasing the vehicle weight by changing the plate thickness of both components. In other words, a load input 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 rear side member front portion 38. 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, to increase the rigidity of the portion of the rear side member 10 extending from the arm support bracket 20 to the front cross member 12, it is sufficient to ensure a large plate thickness for the rear side member front portion 38 located in the vicinity forward of the arm support bracket 20, and it is also acceptable to set the plate thickness of the rear side member main body 36 smaller than the plate thickness of the rear side member front portion 38. Therefore, compared to when the rear side member 10 is constructed as an integral unit and a large plate thickness is ensured for the rear side member 10, it is possible to increase the rigidity of the rear side member 10 against the lateral load input from the arm support bracket 20 without increasing the weight of the vehicle body.

[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 side wall 1210 Ridge line 14 Rear cross member 1402 Bottom wall 1404 Side wall 16 Floor panel 16A Front floor panel 16B Rear floor panel 18 Floor side member 18A Rear 20 Arm support bracket 21 Bush 22 Torsion beam suspension device 24 Trailing arm 26 Torsion beam 28 Coil spring 2802 Spring seat 2804 Spring support 30 Shock absorber 32 Rear wheel 34 Reinforcement 3402 Lower plate portion 3404 Rear plate portion 36 Rear side member main body 3602 Bottom wall 3604 Side wall 38 Front portion of rear side member 3802 Bottom wall 3804 Side wall 3804A Inner wall 3810 Bottom wall flange portion 3812 Extended flange portion 3820 Flange 3822 Flange 40 Mounting portion 4002 Rear panel portion 4004 Intermediate panel portion 4006 Front panel portion 42 Support plate portion

Claims

1. a pair of rear side members extending in a front-rear direction of the vehicle and spaced apart in a vehicle width direction; a cross member extending in a vehicle width direction in front of the pair of rear side members and to which front ends of the pair of rear side members are connected; an arm support bracket attached to each of the rear side members near the cross member and supporting a front end of the trailing arm, a bottom wall flange portion is provided at a front end of the rear side member, the bottom wall flange portion being continuously extended from the bottom wall of the rear side member toward the front of the vehicle and overlapping and joined to the bottom wall of the cross member from below; the bottom wall flange portion has an extended flange portion that extends inward in the vehicle width direction from a side wall of the rear side member that is on the inner side in the vehicle width direction and is joined to the bottom wall of the cross member, a pair of floor side members are provided at locations forward of the rear side members and inward of the rear side members in the vehicle width direction, the floor side members being spaced apart in the vehicle width direction and extending in the vehicle front-rear direction, and the rear portions of the floor side members being joined to the cross member; A vehicle rear structure characterized by:

2. a pair of side sills extending in the vehicle front-rear direction on vehicle width direction outer sides of the rear side members, The rear portion of the side sill is disposed adjacent to the front end side of the rear side member.

2. The vehicle rear structure according to claim 1.

3. The extension flange portion extends inward in the vehicle width direction along a ridge line of a corner formed by a bottom wall of the cross member and a rear wall located on the vehicle rear side of the cross member.

3. The vehicle rear structure according to claim 1 or 2.

4. A reinforcement extending in the vehicle width direction along the ridge line of the corner between the bottom wall of the cross member and the rear side wall of the cross member is provided, The extension flange portion is connected to the reinforcement.

4. The vehicle rear structure according to claim 3.

5. The reinforcement has an L-shaped cross section having a lower plate portion that is overlapped on the bottom wall of the cross member and a rear plate portion that stands up from the lower plate portion and is overlapped on the rear wall of the cross member, and is provided so as to straddle the ridge line inside the corner of the cross member, The extension flange portion is overlapped with the bottom wall of the cross member and the lower plate portion, and is joined in three layers.

5. The vehicle rear structure according to claim 4.

6. The rear portions of the floor side members are overlapped and joined to the bottom wall of the cross member from below, The reinforcement is connected to the rear portion of the floor side member.

5. The vehicle rear structure according to claim 4.

7. the rear side member includes a rear side member main body on which the arm support bracket is provided, and a rear side member front portion coupled to a front portion of the rear side member main body to connect the rear side member main body and the cross member, The bottom wall flange portion extends forward from the bottom wall of the front portion of the rear side member.

2. The vehicle rear structure according to claim 1.

8. the rear side member main body and the rear side member front portion are joined such that the bottom wall and the pair of side walls of the rear side member main body are overlapped on the outer sides of the bottom wall and the pair of side walls of the rear side member front portion, the arm support bracket has an attachment portion that is attached to the rear side member, the mounting portion includes a front panel portion joined to a bottom wall of the rear side member main body, The front panel portion is overlapped with the bottom wall of the rear side member main body and the bottom wall of the rear side member front portion and joined in three layers.

8. The vehicle rear structure according to claim 7.