WO2015037130A1

WO2015037130A1 - Rear vehicle structure

Info

Publication number: WO2015037130A1
Application number: PCT/JP2013/074854
Authority: WO
Inventors: 修司市川; タナコムイッティーポンソパー
Original assignee: 本田技研工業株式会社
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2015-03-19

Abstract

In this rear vehicle structure, the front portion of a rear side frame (5) is curved outwards in the vehicle width direction in a first curved portion (6) and is connected to a side sill (3). This rear vehicle structure is provided with a reinforcing frame (35) which extends in the longitudinal direction of the vehicle, has a front end (24a) connected to a floor-side reinforcing member (outer sheet mounting bracket (22)) disposed further inward in the vehicle width direction than the side sill (3), and has a rear end (32a) and a rear lower joining flange (33) connected to the area in the front portion of the rear side frame (5) that includes at least the start of the curve in the first curved portion (6).

Description

Car body rear structure

The present invention relates to a vehicle body rear structure.

For example, in Patent Document 1, the front portion of the rear side frame is bent in a crank shape outward in the vehicle width direction, the front end portion is connected to the rear end portion of the side sill, and the floor frame on the inner side in the vehicle width direction than the side sill. Disclosure of a structure in which the front end portion of the rear side frame is also connected to the rear end portion via a front bracket (reinforcing member), and the load at the time of rear collision is distributed and input from the rear side frame to the two members of the side sill and the floor frame. is there.

Japanese Patent No. 3816418

However, in the above prior art, although the load at the time of rear collision can be dispersed, the attachment point of the front bracket, which is a reinforcing member, is the front end of the rear side frame that is not already in the crank shape, so that a large load is applied to the rear side frame. In this case, the crank portion of the rear side frame may be deformed, which may affect load transmission.
That is, the front end portion of the rear side frame that has passed the crank shape is connected to the side sill and the floor frame (floor side strength member) on the inner side in the vehicle width direction than the side sill. The load is not transmitted linearly to the floor side strength member on the inner side in the vehicle width direction, but is transmitted so as to detour. For this reason, when a large load is applied, the reinforcing member may not be able to support the load, and the front portion of the rear side frame may be bent.

In view of this, the present invention provides a vehicle body rear structure in which the front portion of the rear side frame is bent outward in the vehicle width direction and connected to the side sill. The purpose is to suppress.

In order to solve the above problems, the present invention employs the following means.
(1) That is, the present invention is a vehicle body rear structure in which the front portion of the rear side frame is bent outward in the vehicle width direction at the outer bent portion and connected to the side sill. The reinforcing frame is connected to the floor-side strength member on the inner side in the vehicle width direction, and the rear end portion is connected to a portion including at least the start of bending of the outer bent portion in the front portion of the rear frame.
According to this configuration, the front portion of the rear side frame is connected to the side sill in a crank shape via a portion that bends outward in the vehicle width direction from the outer bent portion, and forward from the portion including the start of bending of the outer bent portion. The floor-side strength member is linearly connected via the extending reinforcing frame.
As a result, the periphery of the outer side bent portion of the rear side frame that is easily bent can be linearly supported from the front by the floor side strength member via the reinforcing frame, so that a large load such as a rear impact load is applied to the rear side frame from the rear. Even when added, it is possible to suppress the bending from the outer bent portion of the rear side frame, to transmit the load well to the floor side strength member, and to distribute and absorb the load on the entire floor.
In addition, the load from the rear side frame is mainly transmitted to the side sill, but not only to it, but also to the floor side strength member on the inner side in the vehicle width direction from the side sill through the reinforcing frame branched from the outer bent part of the rear side frame. Since the load is dispersed, a larger load can be absorbed.

(2) The configuration described in (1) above may be configured such that the reinforcing frame includes a load transmission portion that linearly extends in the vehicle front-rear direction.
According to this configuration, the portion extending in the vehicle front-rear direction behind the outer bent portion in the rear side frame and the load transmitting portion of the reinforcing frame that also extends in the vehicle front-rear direction are connected in a straight line, so that the rear side Good transmission from the frame to the floor side strength member is possible.

(3) In the invention according to (1), the floor-side strength member includes an outer seat mounting bracket for attaching an outer side in the vehicle width direction of the seat, and the reinforcing frame is connected to the outer seat mounting bracket. Good.
According to this configuration, the outer seat mounting bracket is a member that connects the seat on which the occupant sits and the vehicle body, and it is necessary to hold the occupant even when a large load is applied at the time of a collision. Is done. By connecting a reinforcement frame to this outer seat mounting bracket, it is possible to firmly support the load at the time of rear impact and suppress bending of the rear side frame, and to distribute the load from the high-strength member on the floor side to the entire floor. it can.

(4) In the invention described in (1) above, the outer seat mounting bracket and the reinforcing frame are provided on the vehicle width direction outer side of the vehicle body to form a pair of left and right, and fuel is provided between the left and right outer seat mounting brackets. The structure by which a tank is arrange | positioned may be sufficient.
According to this configuration, the connection between the reinforcing frame, which is a strength member, and the outer seat mounting bracket suppresses bending of the rear side frame without reinforcement to the inner side in the vehicle width direction, and between the left and right outer seat mounting brackets. Damage from deformation and the like can be avoided even with external loads. By disposing the fuel tank, which is one of the most necessary parts to prevent damage at the time of collision, between the left and right outer seat mounting brackets, damage to the fuel tank can be suppressed even at the time of collision. Further, no large reinforcement is required between the left and right outer seat mounting brackets, and a large capacity fuel tank can be installed.

(5) The invention described in (1) above may be configured such that the floor-side strength member includes a cross member extending in the vehicle width direction, and the reinforcing frame is connected to the cross member.
According to this configuration, the cross member, which is a high-strength member, firmly supports the load at the time of rear collision, suppresses bending of the rear side frame, and applies a larger load from the cross member extending in the vehicle width direction to the entire floor. Can be distributed and transmitted.

(6) In the invention described in (1) above, the reinforcing frame is connected to the end of the cross member, and the reinforcing frame and the cross member are fixed to the floor panel to form a continuous closed section. Good.
According to this configuration, not only the reinforcing frame is simply connected to the cross member, which is a strength member, but also the cross member and the reinforcing frame are integrated to form a closed section together with the floor panel, so that the connecting portion of the reinforcing frame is Including the strength. For this reason, when the load at the time of rear-end collision is distributed to the reinforcing frame, it is prevented that the reinforcing frame is greatly deformed due to a large load and it becomes impossible to transmit the load to the cross member. The load can be transmitted, and the load can be appropriately absorbed on the vehicle body side.

(7) The invention described in (1) may have a configuration in which the reinforcing frame has a reinforcing shape portion extending in a vehicle front-rear direction from a connection portion with the rear side frame.
According to this configuration, the strength of the reinforcing frame is improved by forming the reinforcing shape portion, and when the load is transmitted from the rear side frame to the reinforcing frame at the time of a rear collision, the rear side frame is firmly supported and the bending thereof is suppressed. The load can be reliably transmitted to the floor side strength member via the reinforcing frame, and a larger load can be absorbed.

(8) In the invention according to (1), the reinforcing frame is divided into a rear member connected to the rear side frame and extending in the vehicle front-rear direction, and a front member connected to the floor-side strength member. It may be configured.
According to this configuration, the front side member needs to be connected to the vehicle body, so strength is required, and it is difficult to make the shape that can be connected to the rear side frame as it is, but the divided rear side member is connected to the rear side frame. By doing so, the load from the rear side frame can be firmly supported and transmitted to the vehicle body, and the manufacture of the reinforcing frame can be facilitated.

(9) The invention described in (1) above may be configured such that the front member includes a seat installation portion on the vehicle compartment side.
According to this configuration, the front member itself also serves as a floor-side strength member having the seat installation portion, and the load transmitted from the rear side frame is firmly received, and deformation of the reinforcing frame is reasonably suppressed. Thus, the load from the rear side frame can be reliably transmitted to the vehicle body side.

According to the present invention, in the rear structure of the vehicle body in which the front part of the rear side frame is bent outward in the vehicle width direction and connected to the side sill, the bending of the front part of the rear side frame at the time of a rear collision is suppressed and the load transmission is affected. Can be suppressed.

It is a bottom view of the floor portion of the vehicle body in the embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. It is a perspective view of the middle cross member periphery of the said vehicle body. FIG. 4 is a front view of FIG. 3. FIG. 5 is a VV cross-sectional view of FIG. 1. It is a bottom view of the front part periphery of the rear side frame of the vehicle body. It is a perspective view from the vehicle width direction inner side of FIG. FIG. 7 is a sectional view taken along line VIII-VIII in FIG. It is a perspective view of the rear frame patch connected to the front part of the rear side frame. FIG. 10 is a top view of FIG. 9. FIG. 10 is a front view of FIG. 9. FIG. 10 is an outer side view of FIG. 9. It is a perspective view of the outer seat stiffener to which the rear frame patch is connected. FIG. 14 is a top view of FIG. 13. FIG. 14 is a front view of FIG. 13. FIG. 14 is an outer side view of FIG. 13.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle described below unless otherwise specified. Further, in the drawings used for the following description, an arrow FR indicating the front of the vehicle, an arrow LH indicating the left side of the vehicle, an arrow UP indicating the upper side of the vehicle, and an arrow OUT indicating the outer side in the vehicle width direction are shown.

FIG. 1 is a bottom view of the rear part of the floor of a vehicle body 1 of a passenger car, and a line CL in the figure indicates a vehicle body left-right center line. Left and right side sills 3 extending in the vehicle front-rear direction are disposed on the left and right sides of the floor panel 2 of the vehicle body 1. At the rear of the floor panel 2, a rear floor panel 4 having a slightly narrowed left and right width is continuous. Left and right rear side frames 5 extending in the vehicle front-rear direction are disposed on the left and right sides of the rear floor panel 4.

The front parts of the left and right rear side frames 5 are bent in a gentle crank shape outward in the vehicle width direction (vehicle left-right direction). In the following description, the first bent portion 6 is the bent portion of the front portion of the rear side frame 5 in the vehicle width direction outside, the second bent portion 7 is the bent portion inward of the vehicle width direction in front of the first bent portion 6, and both bent portions 6. , 7 is referred to as the outer inclined portion 8, and the portion extending in the vehicle front-rear direction in front of the second bent portion 7 is referred to as the outer displacement portion 9.

The left and right outer displacement portions 9 are arranged along the rear inner side of the side sill 3 and joined together.
Referring also to FIG. 2, the outer inclined portion 8 of the rear side frame 5 is inclined so as to be positioned on the lower side as viewed from the vehicle side. Accordingly, the outer displacement portion 9 and the side sill 3 of the rear side frame 5 are positioned below the rear portion behind the first bent portion 6 in the rear side frame 5. Further, the floor panel 2 is positioned below the rear floor panel 4.

In the left and right outer inclined portions 8 near the second bent portion 7, inner arm shaft support portions 11 are provided along the proximal end inner portion of the trailing arm SU of the rear suspension. Referring to FIG. 1, the rear end portions of the left and right side sills 3 respectively extend rearward from the second bent portion 7, and the outer arm shaft support portion 12 along the base end outer side portion of the trailing arm SU is provided at the rear end portion. Provided. These left and right inner and outer arm

shaft support portions

11 and 12 constitute a left and right rear suspension coupling portion 13. A performance rod 14 extending in the vehicle width direction is provided between the base end sides of the left and right inner arm shaft support portions 11 in the rear suspension connection portion 13. The performance rod 14 is fixed to the vehicle body 1 by fastening the left and right end portions thereof to the left and right of the rear suspension connecting portion 13 and fastening the left and right intermediate portions to the left and right intermediate portions of the middle cross member 16.

A center cross member 15 extending in the vehicle width direction is provided between the front end portions of the left and right rear side frames 5. 3 and 4 together, a middle cross member 16 extending in the vehicle width direction is provided between the portions of the left and right outer inclined portions 8 from the second bent portion 7 via an outer seat stiffener 24. Is done. A rear floor cross member 17 extending in the vehicle width direction is provided between the rear portions of the left and right rear side frames 5 with respect to the first bent portion 6.

Between the center cross member 15 and the middle cross member 16, a flat fuel tank 19 with a reduced vertical thickness is disposed. Here, a space between the

cross members

15 and 16 in the vehicle front-rear direction and between the rear side frame 5, an outer seat mounting bracket 22 and a side sill 3 described later in the vehicle left-right direction is defined as a tank arrangement space Ar. The fuel tank 19 is mounted on the tank arrangement space Ar from below the floor, and is supported by a tank support member (not shown) across the

cross members

15 and 16. The right side of the fuel tank 19 is shorter in the vehicle left-right direction than the left side, and an exhaust pipe or the like (not shown) passes through the right side of the fuel tank 19. The center cross member 15 is curved so as to displace the middle portion in the vehicle width direction forward, and the front portions of the left and right rear side frames 5 are displaced outward in the vehicle width direction, thereby expanding the tank arrangement space Ar and the fuel tank. 19 capacity is secured.

Referring to FIGS. 1 and 2, a first row seat (not shown) and a second row seat S <b> 2 are arranged on the floor panel 2, and a third row seat S <b> 3 is arranged on the rear floor panel 4.
The second row seat S <b> 2 is supported by the vehicle body 1 via the seat slide rail 21. The seat slide rail 21 includes a rail main body 21a extending in the vehicle front-rear direction, a front support bracket 21b that supports the front end of the rail main body 21a so as to swing up and down, and a seat striker in which the rear portion of the rail main body 21a is fixed to the vehicle body 1. 26, and a rear lock mechanism 21c that is engaged with 26.

The front support bracket 21b extends from the outer side in the vehicle width direction of the center cross member 15 to the rear side, the outer seat mounting bracket 22 extending along the inner side of the outer displacement portion 9 of the rear side frame 5, and the rear side from the inner side in the vehicle width direction of the center cross member 15 Fastened to and supported by a pair of inner sheet mounting brackets 23 extending to the front. In the figure,

reference numerals

22a and 23a denote bolts for fastening the front support bracket 21b fixed to the inner and outer

seat mounting brackets

22 and 23, respectively. The inner and outer

seat mounting brackets

22 and 23 are members for connecting the seat S2 on which the occupant sits and the vehicle body 1 and need to hold the occupant even when a heavy load is applied during a collision. It is a member with high mechanical strength.

The rear end portion of the outer seat mounting bracket 22 is joined to the front end portion 24a of the outer seat stiffener 24 that connects the middle cross member 16 and the rear side frame 5, and the rear end portion of the inner seat frame is joined to the middle cross member 16 and the floor panel 2. Are joined to the front protruding portion 25a of the inner sheet stiffener 25 sandwiched between the two. A portion of the inner and

outer seat stiffeners

24 and 25 is exposed on the floor panel 2 (vehicle compartment side), and a seat striker 26 is fixed to each exposed portion. The inner and

outer sheet stiffeners

24 and 25 are relatively thick plate structures fixed to the floor panel 2 like the inner and outer

sheet mounting brackets

22 and 23 and the cross members 15 to 17. May be collectively referred to.

Here, in the above structure in which the left and right rear side frames 5 are bent outward in the vehicle width direction so as to avoid the fuel tank 19, the crank shape of the front part of the rear side frame 5 is bent by an input at the time of a rear collision (at the time of rear collision). In order to suppress buckling and to reliably transmit the load at the time of rear collision from the rear side frame 5 to the floor side strength member, the first side bending portion 6 that is the starting point of the bending is supported by the floor side strength member. Is preferred.

Therefore, in the present embodiment, the rear frame patch 31 is provided between the first bent portion 6 of the rear side frame 5 and the outer seat stiffener 24. The rear frame patch 31 linearly extends forward of the vehicle so as to branch from the first bent portion 6 of the rear side frame 5 and is connected to an outer seat stiffener 24 that is a floor-side strength member. As a result, even when the rear side frame 5 is bent and the fuel tank 19 is enlarged in the left-right direction of the vehicle, the rear impact load is linearly applied from the first bent portion 6 which is the starting point of the bending to the rigid floor side strength member. Entered. Therefore, it is possible to suppress the bending of the rear side frame 5 and transmit the rear impact load to the floor-side strength member satisfactorily and to disperse and absorb the load throughout the floor.

As shown in FIGS. 6 to 12, the rear frame patch 31 includes a strip-shaped patch side wall 32 that extends in front of the first bent portion 6 and continues to the front of the inner side wall 5a of the rear side frame 5, and a rear side of the patch side wall 32. A rear lower joint flange 33 that rises outward in the vehicle width direction so as to overlap the lower wall 5b of the rear side frame 5 from the lower edge, and a front upper edge that is inclined so as to be positioned on the lower side toward the front side of the patch side wall 32 And a front upper joint flange 34 that rises outward in the vehicle width direction so as to overlap the joint flat portion 24b of the outer sheet stiffener 24 from below.

The patch side wall 32 has a rear end portion 32a as a rear connection portion with respect to the inner side wall 5a of the rear side frame 5, and a plurality of points (for example, three points) sp1 of the rear end portion 32a are spot welded to the inner side wall 5a of the rear side frame 5. . A circular bead 32 b is formed at the upper and lower intermediate portions of the patch sidewall 32 along the extending direction of the patch sidewall 32. The circular bead 32b extends continuously from the rear end of the patch side wall 32 to a site in front of the front end.
A plurality of points (for example, three points) sp2 of the rear lower joint flange 33 are spot-welded to the lower wall 5b of the rear side frame 5. The rear end portion 32 a and the rear lower joint flange 33 are joined to a portion that is a starting point (beginning of bending) of the first bent portion 6 in the rear side frame 5.

The front upper joint flange 34 has a front part 34a formed so as to overlap the joint flat part 24b of the outer sheet stiffener 24, and a rear part 34b formed so as to overlap the inner upper edge joint flange 5c of the rear side frame 5. . The rear portion 34b is inclined so as to be along the outer inclined portion 8 of the rear side frame 5, and is also inclined with respect to the front portion 34a. For example, one point sp3 on the front end side of the rear portion 34b is spot welded together with the inner upper edge joint flange 5c of the rear side frame 5 and the outer joint flange 27 of the outer seat stiffener 24. For example, one point sp4 on the front end side of the front portion 34a is spot-welded to the joining flat portion 24b of the outer sheet stiffener 24. A point sp5 in the figure indicates spot welding between the inner upper edge joint flange 5c of the rear side frame 5 and the outer joint flange 27 of the outer seat stiffener 24.

As shown in FIG. 6 to FIG. 8 and FIG. 13 to FIG. 16, the outer seat stiffener 24 includes an outer joint flange 27 that is overlapped and joined to the inner upper edge joint flange 5c of the outer inclined portion 8 of the rear side frame 5 from below. A gradually changing portion 28 that changes so as to approach a substantially horizontal floor surface on the inner side of the joint flange 27, and a middle cross member 16 that extends from the rear inner side of the gradually changing portion 28 to the inner side in the vehicle width direction (the floor in the claims) A side strength member, corresponding to a cross member), and an inwardly extending portion 29 connected to the end portion.

The front end portion of the gradual change portion 28 is connected to and joined to the rear end portion of the outer sheet mounting bracket 22. A point sp6 in the figure indicates spot welding between the front end portion of the gradual change portion 28 and the rear end portion of the outer seat mounting bracket 22. The gradual change portion 28 forms the joint flat portion 24b at the center thereof, and forms a bead-shaped portion 24c extending in the vehicle front-rear direction in front of the joint flat portion 24b and reaching the joint portion with the outer seat mounting bracket 22. To do. A seat striker 26 is fixed on the upper surface side of the bead-shaped portion 24c so as to straddle the left and right. The peripheral portion of the bead-shaped portion 24c including the seat striker 26 is exposed to the vehicle compartment side from the opening formed in the floor panel 2, and the rear lock mechanism 21c of the second row seat S2 can be locked to the seat striker 26. And
Referring to FIGS. 3 to 5, a pair of seat strikers 26 are also fixed on the upper surface side of the inner seat stiffener 25, and these are exposed to the cabin side so that the second row seat S2 can be locked.

The inwardly extending portion 29 has a hat-shaped cross-sectional shape that opens upward, and has an end shape similar to that of the middle cross member 16 that extends in the vehicle width direction. The inward extending portion 29 is joined to the lower surface of the floor panel 2 together with the middle cross member 16 to form a closed cross-sectional structure continuous in the vehicle width direction. The floor panel 2 is displaced downward in a stepped manner on the inner side of the rear side frame 5, thereby forming a recess 2a that opens downward on the inner side of the rear side frame 5 (see FIG. 5). The patch side wall 32 and the front upper joint flange 34 of the rear frame patch 31 are disposed in the recess 2a.

Referring to FIGS. 1, 6, and 7, the rear frame patch 31 and the outer seat stiffener 24 have a front end portion (a front end portion 24 a of the outer seat stiffener 24) connected to the floor-side strength member (the outer seat mounting bracket 22). The rear end portion (the rear end portion 32a of the rear frame patch 31 and the rear lower joint flange 33) constitutes a reinforcing frame 35 connected to the starting point of the first bent portion 6 of the rear side frame 5.

The rear frame patch 31 and the bead-shaped portion 24c of the outer seat stiffener 24 are linearly connected in the vehicle front-rear direction, and the connection portion of the rear frame patch 31 to the rear side frame 5 (rear end portion 32a and rear lower joint flange 33). The connecting portion (front end portion 24a) of the outer sheet stiffener 24 to the outer sheet mounting bracket 22 is coupled. In other words, the rear frame patch 31 and the bead-shaped portion 24 c of the outer seat stiffener 24 constitute a load transmitting portion 36 that extends linearly in the vehicle front-rear direction in the reinforcing frame 35.

Thereby, the rear portion of the rear side frame 5 with respect to the first bent portion 6 and the load transmitting portion 36 of the reinforcing frame 35 are linearly connected in the vehicle longitudinal direction. When a rear impact load is input to the rear side frame 5, the load is received by the floor side strength member via the reinforcing frame 35, and bending of the bent rear side frame 5 is suppressed. That is, compared with the case where the load is only transmitted in a crank shape from the first bent portion 6 via the outer inclined portion 8 and the second bent portion 7, the starting point of the first bent portion 6 is directed to the outer seat mounting bracket 22. By transmitting the load in a straight line, buckling of the front part of the rear side frame 5 to be bent is suppressed, and as described above, the rear impact load is well transmitted to the floor side strength member, and the entire floor is Dispersed and absorbed.

As described above, in the present embodiment, in the vehicle body rear structure in which the front portion of the rear side frame 5 is bent outward in the vehicle width direction and connected to the side sill 3, the front end portion (front end portion 24a) is a floor-side strength member ( The rear end portion (rear end portion 32a and rear lower joint flange 33) is connected to the outer seat mounting bracket 22) and is a bent portion (first bent portion 6) on the outer side in the vehicle width direction at the front portion of the rear side frame 5. A reinforcing frame 35 to be connected is provided.

According to this configuration, since the first bent portion 6 of the rear side frame 5 that is easily bent can be supported by the floor-side strength member via the reinforcing frame 35, a large load such as a rear impact load is applied to the rear side frame 5. Even when added, it is possible to suppress the bending of the rear side frame 5 from the first bent portion 6, to transmit the load well to the floor side strength member, and to disperse and absorb the load on the entire floor.
In addition, the load from the rear side frame 5 is mainly transmitted to the side sill 3 (which is also a floor side strength member), but not only that, via the reinforcing frame 35 branched from the first bent portion 6 of the rear side frame 5, Since the load is distributed also to the floor side strength member (outer seat mounting bracket 22) on the inner side in the vehicle width direction of the side sill 3, a larger load can be absorbed.

In the present embodiment, the reinforcing frame 35 includes the load transmitting portion 36 that linearly extends in the vehicle front-rear direction, so that the rear side frame 5 that extends in the vehicle front-rear direction behind the first bent portion 6 and the first bend The load transmitting portion 36 of the reinforcing frame 35 that similarly extends in the vehicle longitudinal direction from the portion 6 is connected in a straight line, so that even a heavy load can be satisfactorily transmitted from the rear side frame 5 to the floor side strength member.

Further, in the present embodiment, the floor-side strength member includes the outer sheet mounting bracket 22 having the mounting portion (bolt 22a) of the seat S2, and the reinforcing frame 35 is connected to the outer sheet mounting bracket 22, thereby The load at the time of a collision can be firmly supported to prevent the rear side frame 5 from being bent, and the load can be distributed from the high-strength member on the floor side to the entire floor.

In the present embodiment, the outer seat mounting bracket 22 and the reinforcing frame 35 are provided on the outer side in the vehicle width direction of the vehicle body 1 to form a pair of left and right, and the fuel tank 19 is disposed between the left and right outer seat mounting brackets 22. Thus, the connection between the reinforcing frame 35, which is a strength member, and the outer seat mounting bracket 22 suppresses bending of the rear side frame 5 without reinforcement to the inner side in the vehicle width direction, and between the left and right outer seat mounting brackets 22 Can escape damage caused by deformation or the like even with external load. By disposing the fuel tank 19, which is one of the parts most necessary to prevent damage at the time of collision, between the left and right outer seat mounting brackets 22, damage to the fuel tank 19 can be suppressed even at the time of collision. Further, no large reinforcement is required between the left and right outer seat mounting brackets 22, and the fuel tank 19 having a large capacity can be installed.

Further, in the present embodiment, the floor side strength member includes the middle cross member 16 extending in the vehicle width direction, and the middle cross member that is a member having high strength is connected to the middle cross member 16 by the reinforcing frame 35. 16 can firmly support the load at the time of rear collision, suppress the bending of the rear side frame 5, and can distribute and transmit a larger load from the middle cross member 16 extending in the vehicle width direction to the entire floor.

Further, in the present embodiment, the reinforcing frame 35 is connected to the end of the middle cross member 16, and the reinforcing frame 35 and the middle cross member 16 are fixed to the floor panel 2 to form a continuous closed cross section. In addition to simply connecting the reinforcing frame 35 to the middle cross member 16 that is a strength member, the middle cross member 16 and the reinforcing frame 35 are integrally formed with the floor panel 2 to form a closed cross section, thereby connecting the reinforcing frame 35. Strength is improved including the part. For this reason, when the load at the time of rear collision is distributed to the reinforcing frame 35, it is prevented that the reinforcing frame 35 is greatly deformed by a large load and the load transmission to the middle cross member 16 cannot be performed. The load can be reliably transmitted to the middle cross member 16, and the load can be absorbed appropriately on the vehicle body 1 side.

Further, in the present embodiment, the reinforcing frame 35 includes the circular beads 32b extending in the vehicle front-rear direction from the connecting portion (rear end portion 32a) with the rear side frame 5, whereby the strength of the reinforcing frame 35 is increased by forming the circular beads 32b. When the load is transmitted from the rear side frame 5 to the reinforcing frame 35 at the time of a rear collision, the rear side frame 5 is firmly supported to suppress the bending, and the load is applied to the floor side strength member via the reinforcing frame 35. Can be reliably transmitted and a larger load can be absorbed.

In the present embodiment, the reinforcing frame 35 is divided into a rear frame patch 31 connected to the rear side frame 5 and extending in the vehicle front-rear direction, and an outer seat stiffener 24 connected to the floor-side strength member. The outer seat stiffener 24 needs to be connected to the vehicle body 1 and needs to be strong. It is difficult to make the outer seat stiffener 24 connectable to the rear side frame 5 as it is, but the divided rear frame patch 31 is connected to the rear side frame 5. By doing so, the load from the rear side frame 5 can be firmly supported and transmitted to the vehicle body 1, and the reinforcement frame 35 can be easily manufactured.

In the present embodiment, the outer seat stiffener 24 includes the seat striker 26 on the passenger compartment side, so that the outer seat stiffener 24 itself also serves as a floor-side strength member including the seat striker 26 and is transmitted from the rear side frame 5. The load from the rear side frame 5 can be reliably transmitted to the vehicle body 1 side while receiving a sufficient load and suppressing the deformation of the reinforcing frame 35 reasonably.

The present invention is not limited to the above-described embodiment. For example, the outer sheet stiffener 24 and the rear frame patch 31 may be integrally formed. Further, the front side of the rear side frame 5 is not crank-shaped but may be simply bent in the vehicle width direction and connected to the side sill 3. Further, the reinforcing frame 35 may be connected to a floor-side strength member to which no seat is attached. Alternatively, the rear frame patch 31 may be provided with a reinforcing shape portion instead of the circular bead 32b. Moreover, the structure by which the striker was attached to the sheet | seat side and the lock mechanism was attached to the sheet | seat stiffener may be sufficient. The

seat mounting brackets

22 and 13 may have a seat mounting nut.
The configuration in the above embodiment is an example of the present invention, and various modifications can be made without departing from the gist of the present invention, such as replacing the component of the embodiment with a known component.

DESCRIPTION OF SYMBOLS 1 Car body 2 Floor panel 3 Side sill 5 Rear side frame 6 First bending part (outer bending part)
16 Middle cross member (floor side strength member, cross member)
19 Fuel tank 22 Outer seat mounting bracket (floor side strength member)
22a Bolt (Mounting part)
24 Outer sheet stiffener (front side member)
24a Front end portion 26 Seat striker 31 Rear frame patch (rear member)
32a Rear end (connection part)
32b Circular beads (reinforcement shape part)
33 Rear lower joint flange (rear end)
35 Reinforcement frame 36 Load transmission part S2 Second row seat (sheet)

Claims

In the vehicle body rear structure in which the front part of the rear side frame is bent outward in the vehicle width direction at the outer bent part and connected to the side sill.
A portion that extends in the vehicle front-rear direction, has a front end connected to a floor-side strength member on the inner side in the vehicle width direction than the side sill, and a rear end including at least the start of bending of the outer bent portion in the front portion of the rear side frame A vehicle body rear structure comprising a reinforcing frame connected to the vehicle body.
2. The vehicle body rear structure according to claim 1, wherein the reinforcing frame has a load transmitting portion that linearly extends in a vehicle longitudinal direction.
The vehicle body rear structure according to claim 1, wherein the floor-side strength member includes an outer seat mounting bracket for attaching an outer side in the vehicle width direction of the seat, and the reinforcing frame is connected to the outer seat mounting bracket.
4. The outer seat mounting bracket and the reinforcing frame are respectively provided on the outer side in the vehicle width direction of the vehicle body to form a pair of left and right, and a fuel tank is disposed between the left and right outer seat mounting brackets. Car body rear structure as described in 4.
The vehicle body rear structure according to claim 1, wherein the floor side strength member includes a cross member extending in a vehicle width direction, and the reinforcing frame is connected to the cross member.
6. The vehicle body rear structure according to claim 5, wherein the reinforcing frame is connected to an end portion of the cross member, and the reinforcing frame and the cross member are fixed to the floor panel to form a continuous closed cross section.
The vehicle body rear structure according to claim 1, wherein the reinforcing frame has a reinforcing shape portion extending in a vehicle front-rear direction from a connection portion with the rear side frame.
The said reinforcement frame is divided | segmented and comprised by the rear side member connected to the said rear side frame, and extended in the vehicle front-back direction, and the front side member connected to the said floor side strength member. Car body rear structure.
The vehicle body rear part structure according to claim 8, wherein the front member includes a seat installation portion on a vehicle compartment side.