JP2011143882A - Rear part vehicle body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear part vehicle body structure of a vehicle compatibly achieving inside falling rigidity of a tire house and rigidity of the whole of a vehicle body rear part. <P>SOLUTION: This rear part vehicle body structure includes a pair of right and left rear side frames 7 extending in a vehicle longitudinal direction at the vehicle width direction inside from tire house inners 11a and connected to a rear floor panel 13. A cross member 8 extending in the vehicle width direction, a cross member 9 extending in the vehicle width direction on a rear side of the vehicle longitudinal direction from the cross member 8 and a pair of right and left tire house reinforcing members 30 connected over a cab side panel 10 and the tire house inners 11a are provided between the pair of right and left tire house inners 11a between a pair of right and left tire houses 11. In each of the tire house reinforcing members 30, the lower end is connected to a rear floor panel 13. The cross member 9 is connected to the pair of right and left first tire house reinforcing members 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rear vehicle body structure including a front cross member and a rear cross member between a pair of left and right tire houses, and particularly to a rear vehicle body structure in which a rear cross member is connected to a tire house reinforcing member. .

  Conventionally, a rear body of a vehicle is provided with a pair of left and right tire houses for housing a part of a rear wheel on a cab side panel, and a shock absorber of a rear suspension is located at the center in the front-rear direction and above the tire house. A rear vehicle body structure in which a shock absorber mounting portion for mounting the upper end portion of the vehicle is integrally formed is adopted.

  Since a large load acts on the tire house in the vertical direction through the rear wheel during vehicle travel, a gusset plate is provided at the shock absorber mounting portion of the tire house, and the rear suspension is obtained by joining the gusset plate to the rear floor panel. The support rigidity is secured and the tire house (suspension tower) is prevented from falling inside.

  The pair of left and right rear side frames extending in the vehicle front-rear direction is disposed inside the pair of left and right tire houses in the vehicle width direction, and the shock absorber mounting portion and the rear side frame are separated in the vehicle width direction when viewed from the front. When a load is applied to the shock absorber mounting portion, a torsional moment about the axis is generated in the rear side frame. Therefore, a rear vehicle body structure in which a cross member for connecting the pair of left and right rear side frames is provided on the upper surface of the rear floor panel is also known.

  In Patent Document 1, a rear floor panel, a pair of left and right rear side frames, a front rear cross member that connects the rear side frames and is joined to the lower surface of the rear floor panel, and a part of the rear side of the front rear cross member are located behind. The wheel house member includes a rear support member that extends in the vehicle width direction, joined to the upper surface of the rear floor panel so as to wrap, and a wheel house member (gusset plate) that is arranged from the upper part to the lower part of the wheel house inner. A rear vehicle body structure in which the side wall portion and the left and right end portions of the rear support member are joined is disclosed. In Patent Document 1, the left and right end portions of the rear support member are joined to the upper portion of the rear side frame where torsional deformation occurs to increase the torsional rigidity of the rear side frame, and the support rigidity of the rear suspension is increased by the wheel house member. .

JP 2006-218989 A

  The vehicle body structure of Patent Document 1 includes a rear side frame, a front rear cross member disposed at a rear portion of a bent portion (kickup portion), and a rear side behind a front rear cross member as basic vehicle strength members. A rear cross member is provided. In Patent Document 1, it is necessary to provide a vehicle body strength member such as a wheel house member for securing the inward falling rigidity of the wheel house and a rear support member for securing the torsional rigidity of the rear side frame, which may increase the weight of the vehicle body. There is.

  Further, among the cross members arranged between the left and right tire houses, the front cross member provided in the kick-up portion contributes greatly to the rigidity of the vehicle body, so it is difficult to change the position of the front cross member in the vehicle longitudinal direction. It is. In other words, when the front cross member and the shock absorber mounting portion are largely separated in the vehicle front-rear direction, the rear support member is largely separated from the shock absorber mounting portion to the front, and the torsional rigidity cannot be sufficiently increased.

An object of the present invention is to provide a rear body structure of a vehicle that can achieve both the inclining rigidity of a tire house and the rigidity of the entire rear part of the vehicle without increasing the body weight as much as possible, and at the same time, a vehicle that effectively increases torsional rigidity. It is to provide a rear body structure or the like.

The rear body structure of the vehicle according to claim 1 is a floor panel that forms a floor surface of a passenger compartment, a pair of left and right cab side panels that extend in the vehicle front-rear direction, and a bulge inward in the vehicle width direction from the lower part of each cab side panel. In a vehicle rear body structure comprising: a pair of left and right tire houses that protrude; and a pair of left and right rear side frames that extend in the vehicle front-rear direction on the inner side in the vehicle width direction from these tire houses and are joined to the floor panel; Between the pair of left and right tire houses, a front cross member extending in the vehicle width direction, a rear cross member extending in the vehicle width direction behind the front cross member in the vehicle front-rear direction, the cab side panel, and the tire house, A pair of left and right tire house reinforcing members joined to each other, and the lower end of the tire house reinforcing member is the floor panel. Together are joined, it is characterized in that it is connected to the rear cross member.

  In this rear vehicle body structure, a pair of left and right tire house reinforcing members joined to the cab side panel, the tire house, and the floor panel are provided, so that the inside of the tire house is prevented from falling inward in the vehicle width direction. Falling rigidity can be increased. Further, since the rear cross member is connected to the tire house reinforcing member, the rear vehicle body rigidity can be increased.

  According to a second aspect of the present invention, in the first aspect of the invention, the rear cross member is joined to the lower surface of the floor panel and connected to the pair of left and right rear side frames, and the floor panel and the first closed cross section. The rear side frame forms a second closed cross-section portion and a second outer cross-section portion of the floor panel in the vehicle width direction, and the rear cross member and the tire house reinforcing member are formed inside the second closed cross-section portion. It features a reinforcement that connects the two.

A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the tire house reinforcing member is connected to a vehicle width direction outer side portion of the floor panel forming the second closed cross section. .

According to a fourth aspect of the present invention, in the first aspect of the present invention, a spare tire pan that is recessed downward into the floor panel is provided between the pair of left and right tire houses, and the rear cross member is an upper surface of the floor panel. And an upper rear cross member that extends along the outer periphery of the spare tire pan and is joined to the pair of left and right tire house reinforcing members; and an upper rear cross member that is joined to the lower surface of the floor panel and Correspondingly, a lower rear cross member extending along the outer periphery of the spare tire pan is provided.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a tire house reinforcing member extension for connecting the front cross member and the tire house reinforcing member is provided, and the front cross member and the rear cross are provided. A loop frame in which closed cross sections are connected to each other by the member, the pair of left and right tire house reinforcing members, and the tire house reinforcing member extension portion is formed.
A sixth aspect of the invention is characterized in that, in the fifth aspect of the invention, a vehicle accessory is installed below the floor panel, and a mounting portion for the vehicle accessory is provided on the rear cross member.

  According to the first aspect of the present invention, since the tire house reinforcing member is joined to the rear cross member of the vehicle body strength member, the rear vehicle body rigidity and the tire house are tilted inward in the vehicle width direction without increasing the vehicle body weight as much as possible. Suppressing inward rigidity can be increased. Moreover, even if the installation position of the front cross member is far away from the center of the tire house, the inclining rigidity can be increased without affecting the position of the front cross member. It is possible to achieve both improvement in inward rigidity.

According to the invention of claim 2, since the reinforcement for connecting the rear cross member and the tire house reinforcing member is provided inside the second closed cross section, the rear cross member and the tire house reinforcing member are connected to the rear side member. Even when indirectly connected via the rear side member, the rear side member can be prevented from being crushed by the input of the vertical load input from the tire by the reinforcement, and the load is transmitted to the rear cross member to Deformation can be suppressed. Further, the torsional rigidity of the rear side member can be improved by connecting the rear side member to the rear cross member.
According to the invention of claim 3, by constituting a part of the floor panel by the rear side member, the rear side member and the tire house reinforcing member can be directly connected, and the deformation suppression and the torsional rigidity of the rear part of the vehicle body are effectively increased. be able to.

According to the invention of claim 4, even if the shape of the rear cross member is formed along the spare tire pan, it is possible to ensure the inward-falling rigidity and the rear vehicle body rigidity without hindering the accommodation performance of the spare tire.
According to the invention of claim 5, since the front cross member and the rear cross member are connected by the tire house reinforcing member so as to form a loop-shaped frame, the closed cross sections are substantially continuous with the floor panel and the left and right tire houses. A strong lattice-like strength frame can be formed, and the torsional rigidity of the rear vehicle body can be further increased.
According to the invention of claim 6, since the vehicle auxiliary machine is attached using the rear cross member, the support rigidity of the vehicle auxiliary machine can be ensured without newly providing a separate support member.

It is a longitudinal cross-sectional view of the rear vehicle body related to Example 1 of the present invention. It is a top view of a rear body. It is the III-III sectional view taken on the line of FIG. The rear side frame of FIG. It is a principal part enlarged view of 4 cross members and a 1st tire house reinforcement member. It is the VV sectional view taken on the line of FIG. It is a frame block diagram of a rear body. FIG. 6 is a diagram corresponding to FIG. 4 according to the second embodiment. FIG. 6 is a diagram corresponding to FIG. 5 according to the second embodiment. FIG. 6 is a view corresponding to FIG. 1 according to a third embodiment. FIG. 2 is a diagram corresponding to FIG. 2 according to a third embodiment. FIG. 6 is a view corresponding to FIG. 1 according to a fourth embodiment. It is the figure which looked at the rear body from the lower part.

Hereinafter, modes for carrying out the present invention will be described based on examples.
In the following embodiments, the front-rear direction of the vehicle is referred to as the front-rear direction, and the left-right direction of the vehicle is referred to as the left-right direction.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 2 is a plan view of the rear vehicle body with the rear seat device 2 removed.
The vehicle 1 includes a vehicle interior space 3 that includes a front seat device (not shown), a rear seat device 2, and the like, a front and rear side doors (not shown), and a part of the vehicle compartment located behind the rear seat device 2. Is a passenger car having a luggage compartment space 4 and a back door 5 capable of opening and closing a rear opening.

The vehicle body 1 includes a floor panel that forms a floor surface of a passenger compartment, a pair of left and right front side frames 6, a pair of left and right rear side frames 7 connected to a rear end portion of each front side frame 6, and a rear seat. No. 2 is stretched across a pair of rear side frames 7 behind the lower end of the apparatus 2. 4 cross member 8 (front cross member); No. 4 is stretched across the pair of rear side frames 7 behind the cross member 8. 5 Cross members 9 (rear side cross members), a pair of cab side panels 10 constituting the left and right side walls of the vehicle interior space 3 and the cargo compartment space 4, and the lower part of the pair of cab side panels 10 A pair of left and right tire house inners 11a and the like that bulges out are provided.

The floor panel is formed by recessing the front floor panel 12 that forms a floor surface other than the cargo space 4 in the passenger compartment, the center portion 14 and the center portion 14 in the vehicle width direction substantially in the vicinity of the center. A rear floor panel 13 that includes a spare tire pan 16 and an outer portion 15 in the vehicle width direction and that forms the floor surface of the cargo space 4 is provided. On the outer side in the vehicle width direction of the tire house inner 11a, a pair of left and right tire house outers 11b that bulge outward from the lower portion of the cab side panel member 10 in the vehicle width direction are formed integrally with the cab side panel 10, and tires A tire house is constituted by the house inner 11a and the tire house outer 11b.

Further, the vehicle body of the vehicle 1 is No. 1. A pair of left and right tires joined across the second tire house reinforcing member 40 (tire house reinforcing member extension) connected to the four cross members 8, the cab side panel 10, the tire house inner 11a, and the rear floor panel 13. A house reinforcing member 70 and the like are provided. The tire house reinforcing member 70 includes a first tire house reinforcing member 30 joined to the tire house inner 11a and the rear floor panel 13, and a pair of left and right first and second first and second left and right rear portions of the cab side panel 10 at the middle stage portion. The upper ends of the second tire house reinforcing members 30 and 40 are connected to each other, and are configured by a pair of left and right gusset plates 50 and the like to which a shock absorber (not shown) can be attached.

  The pair of left and right rear side frames 7 extend in the front-rear direction on the inner side in the vehicle width direction from the pair of left and right tire house inners 11a, and are integrally continuous so as to overhang the rear end portions of the pair of left and right front side frames 6. It is formed. Between the pair of left and right rear side frames 7, there is provided a kick-up portion 17 that is formed so as to incline backward from the rear end of the front floor panel 12 and is connected to the rear floor panel 13. No. Four cross members 8 are joined.

  As shown in FIGS. 3 and 4, the rear side frame 7 includes a horizontal flange portion 18 at an inner end portion in the vehicle width direction, a vertical flange portion 19 at an outer end portion in the vehicle width direction, a horizontal flange portion 18 and a vertical flange portion 19. And a frame body 20 having a substantially U-shaped cross section. The rear side frame 7 forms a second closed section 24 in cooperation with the vehicle width direction outer side portion 15.

  The vehicle width direction outer portion 15 includes a horizontal flange portion 15a at an inner end portion in the vehicle width direction, an inclined portion 15b inclined upward from the outer end portion of the horizontal flange portion 15a, and a central portion of the rear floor panel 13 connected to the inclined portion 15b. The horizontal plane part 15c is located above 14 and extends horizontally, and the vertical flange part 15d extends upward from the outer end of the horizontal plane part 15c. The second closed cross-section portion 24 is formed by joining the horizontal flange portion 18 and the horizontal flange portion 15a, and joining the vertical flange portion 19 and the vertical flange portion 15d.

The frame body 20 includes an outer wall portion 20a extending in the front-rear direction on the outer side in the vehicle width direction, an inner wall portion 20b extending in the front-rear direction on the inner side in the vehicle width direction, and a lower wall portion that connects lower ends of the outer wall portion 20a and the inner wall portion 20b. And 20c.
The vertical flange portion 19, the vertical flange portion 15d, and the lower end portion of the tire house inner 11a are triple joined by welding. The outer end portion of the central portion 14, the horizontal flange portion 18 and the horizontal flange portion 15a are triple-bonded by welding.

No. The four cross member 8 is disposed at a position in front of the center part in the front-rear direction of the tire house inner 11a, and supports the rear end portion of the rear seat device 2. No. The 4-cross member 8 includes an upper front cross member member 21 having a substantially hat-shaped cross section and a lower front cross member member 22 having a substantially reverse hat-shaped cross section. The upper front cross member member 21 is joined to the upper surface of the kick-up portion 17 to constitute an upper closed cross-section portion, and the lower front cross member member 22 is joined to the lower surface of the kick-up portion 17 to constitute a lower closed cross-section portion. ing. That is, no. The four cross member 8 constitutes a vehicle body strength member having an upper closed cross section formed by an upper front cross member member 21 and a rear floor panel 13 and a lower closed cross section formed by a lower front cross member member 22 and a rear floor panel 13. .

As shown in FIG. 5, the upper front cross member member 21 is inclined downward from the upper surface portion 21a at the upper end, the front surface portion 21b inclined downward from the front end portion of the upper surface portion 21a, and the rear end portion of the upper surface portion 23a. A flange portion joined to the upper surface of the rear floor panel 13 is integrally provided at lower end portions of the rear surface portion 21c, the front surface portion 21b, and the rear surface portion 21c. The lower front cross member member 22 includes a lower end lower surface portion 22a, a front surface portion 22b inclined upward from the front end portion of the lower surface portion 22a, a rear surface portion 22c inclined upward from the rear end portion of the lower surface portion 22a, and a front surface portion. A flange portion to be joined to the lower surface of the rear floor panel 13 is provided at the upper end portions of the 22b and the rear surface portion 22c.

No. with a substantially hat-shaped cross section. 5 The cross member 9 is disposed at a position rearward of the center portion in the front-rear direction of the tire house inner 11a, and includes a lower surface portion 25, a front surface portion 26 inclined upward from a front end portion of the lower surface portion 25, and a rear surface of the lower surface portion 25. A rear surface portion 27 inclined upward from the end portion, flange portions 26a and 27a joined to the lower surface of the central portion 14 and the spare tire pan 16 at the upper end portions of the front surface portion 26 and the rear surface portion 27, and the front surface portion 26 and the rear surface At left and right end portions of the surface portion 27, flange portions 26 b and 27 b that are fixed to the inner wall portion 20 b of the rear side frame 7 by bolts 28 are provided.

No. The 5 cross member 9 is joined to the central portion 14 and the lower surface of the spare tire pan 16, and constitutes a first closed cross section 23 that extends substantially linearly in the vehicle width direction. Since the spare tire pan 13 is recessed downward in the central portion of the central portion 14, the spare tire pan 13 has a No. 5 The area of the closed cross section formed by the cross member 9 and the spare tire pan 16 is the No. 5 The area is set smaller than the area of the closed cross section formed by the cross member 9 and the central portion 14. Therefore, no. Even if the 5-cross member 9 cooperates with the spare tire pan 16 to form the first closed cross-section portion 23, the distance from the road surface can be secured and interference with obstacles during traveling can be prevented.

As shown in FIGS. 1, 2 and 5, the gusset plate 50 having a substantially L-shaped cross section is disposed above the tire house inner 11a and at the center in the front-rear direction, and is a shock absorber (represented in the figure) for the rear wheel suspension. Abbreviation). The gusset plate 50 integrally forms a vertical surface portion 51 extending in the vertical direction, a horizontal surface portion 52 extending from the lower end portion of the vertical surface portion 51 to the inside of the vehicle body, and the like. The vertical surface portion 51 is joined to the cab side panel 10, and the horizontal surface portion 52 is joined to the tire house inner 11a.

The first tire house reinforcing member 30 includes a rear end portion of the gusset plate 50 and a No. 5 A cross-member 9 is connected to form a vehicle body strength member that secures inward rigidity and vehicle body rigidity of the tire house. The first tire house reinforcing member 30 having a substantially hat-shaped cross section includes an inner wall portion 31, a front wall portion 32 that inclines outward from the front end portion of the inner wall portion 31, and a rear end portion of the inner wall portion 31 outward from the vehicle body. An inclined rear wall 33 and the like are provided.

The first tire house reinforcing member 30 forms a closed cross-section portion 36 by the tire house inner 11a and the outer portion 15 of the rear floor panel 13 in the vehicle width direction. The first tire house reinforcing member 30 is curved backward toward the inner side in the vehicle width direction. 5 The cross member 9 is connected to the vehicle width direction outer side portion 15 corresponding to the vehicle width direction outer side end portion.

A flange portion 31 a is provided at the lower end portion of the inner wall portion 31. The 5-cross member 9 is joined to the inclined portion 15b between the flange portions 26b and 27b and at a position above the flange portions 26b and 27b.
The front wall portion 32 and the rear wall portion 33 are provided with flange portions 32a, 33a, etc. on the vehicle width direction outer side portion. The flange portion 32a is joined to the tire house inner 11a and the horizontal surface portion 15c of the vehicle width direction outer portion 15, and the flange portion 33a is joined to the tire house inner 11a and the horizontal surface portion 15c of the vehicle width direction outer portion 15.

In the second closed cross-section portion 24, corresponding to the first tire house reinforcing member 30 and the No. 1 member below the closed cross-section portion 36 and outside the vehicle body of the first closed cross-section portion 23. First and second reinforcements 34 and 35 for connecting the five cross members 9 are provided.
The first reinforcement 34 is formed of a plate member substantially parallel to the inclined portion 15b, and has an upper end portion joined to the outer end portion of the horizontal surface portion 15c and a lower end portion joined to the lower end portion of the inner wall portion 20b. Therefore, the first reinforcement 34 extends in the vehicle width direction outward as viewed from the front, and is disposed at a diagonal line position of the second closed cross-sectional portion 24.

The second reinforcement 35 is formed of a plate member substantially parallel to the inclined portion 15b, and has an upper end portion joined to an inner portion of the horizontal surface portion 15c and a lower end portion joined to an upper portion of the inner wall portion 20b. As described above, the first tire house reinforcing member 30 and the No. The 5 cross member 9 is connected by the rear side frame 7 and is connected by the first and second reinforcements 34 and 35 inside the second closed cross section 24.

The second tire house reinforcing member 40 includes a front end portion of the gusset plate 50 and a No. The four cross members 8 are connected to each other to constitute a vehicle body strength member that secures inward rigidity and vehicle body rigidity of the tire house. The second tire house reinforcing member 40 having a substantially hat-shaped cross section includes an inner wall portion 41, a front wall portion 42 that inclines outward from the front end portion of the inner wall portion 41, and a rear end portion of the inner wall portion 41 outward from the vehicle body. An inclined rear wall 43 and the like are provided.

The second tire house reinforcing member 40 forms a closed cross section by the tire house inner 11a and the outer portion 15 of the rear floor panel 13 in the vehicle width direction. The second tire house reinforcing member 40 is curved forward toward the inner side in the vehicle width direction. The four cross members 8 are connected to the outer end portion in the vehicle width direction and the outer portion 15 in the vehicle width direction.

A flange portion 41 a is provided at the lower end portion of the inner wall portion 41, and the flange portion 41 a is joined to the upper surface portion 21 a of the upper front cross member member 21.
The front wall portion 42 and the rear wall portion 43 are provided with flange portions 42a, 43a, etc. on the vehicle width direction outer side portions. The flange portion 42a is joined to the tire house inner 11a and the horizontal surface portion 15c of the vehicle width direction outer portion 15, and the flange portion 43a is joined to the tire house inner 11a and the horizontal surface portion 15c of the vehicle width direction outer portion 15.

As shown in the frame configuration diagram of FIG. No. 4 cross member 8 upper front cross member member 21; 5 A horizontal loop frame is formed by the cross member 9, and a pair of left and right is formed by the rear side frame 7, the first and second tire house reinforcing members 30, 40 and the gusset plate 50 at the left and right ends of the horizontal loop frame. A vertical loop frame is formed. Therefore, an inverted portal frame F is formed by the horizontal loop frame and a pair of left and right vertical loop frames so that the closed cross sections are substantially continuous.

As described above, a plurality of vehicle body strength members constituting the closed cross-section can constitute a horizontal grid-shaped strength frame and a pair of vertical grid-shaped strength frames connected to the left and right sides, with the front-rear direction serving as the rotation axis. It is possible to improve the torsional rigidity and increase the vehicle body rigidity with respect to the torsional moment, the torsional moment with the vehicle width direction as the rotational axis, and the torsional moment with the vertical direction as the rotational axis.

Next, functions and effects of the rear vehicle body structure related to Example 1 will be described.
The rear vehicle body structure includes a rear floor panel 13 that forms the floor of the passenger compartment, a pair of left and right cab side panels 10 that extend in the vehicle front-rear direction, and a left and right 1 that bulges inward in the vehicle width direction from the bottom of each cab side panel. Rear body structure of the vehicle 1 including a pair of tire house inners 11a and a pair of left and right rear side frames 7 that extend in the vehicle front-rear direction inside the vehicle width direction from the tire house inners 11a and are joined to the rear floor panel 13. No. 1 extending in the vehicle width direction between the pair of left and right tire house inners 11a. 4 cross member 8, No. 4 which extends in the vehicle width direction from the cross member 8 in the vehicle longitudinal direction rearward. 5 A cross member 9, and a pair of left and right tire house reinforcing members 70 joined to the cab side panel 10 and the tire house inner 11a are provided, and the lower end of the tire house reinforcing member 70 is arranged on the rear floor. It is joined to the panel 13 and 5 Since the cross member 9 is connected to the pair of left and right tire house reinforcing members 70, the rear body rigidity due to the improvement of the rigidity of the floor panel and the tire house inner 11a falling inward in the vehicle width direction without increasing the body weight as much as possible. The inclining rigidity to be suppressed can be increased, and both improvement in fuel consumption and improvement in steering stability can be achieved.

Moreover, no. No. 4 Since the torsional rigidity can be increased regardless of the installation position of the cross member 8, no. The four cross members 8 can be provided at the rear end and upper end positions of the kick-up portion 17, and both the rear vehicle body rigidity and the inward rigidity can be achieved. Since it is not necessary to separately provide a member for preventing the tire house inner 11a from falling down on the upper surface of the rear floor panel 13, a large cargo space 4 can be secured.

No. The 5 cross member 9 is joined to the lower surface of the rear floor panel 13 and is connected to the pair of left and right rear side frames 7 and forms a first closed cross section 23 with the rear floor panel 13. A vehicle width direction outer side portion 15 and a second closed cross-section portion 24 are formed. No. 5 because the first and second reinforcements 34 and 35 that connect the cross member 9 and the first tire house reinforcing member 30 of the tire house reinforcing member 70 are provided. 5 Even if the cross member 9 and the first tire house reinforcing member 30 are indirectly connected via the rear side frame 7, the load in the vertical direction inputted from the tire is No. 5. It can be transmitted to the cross member 9 to suppress deformation of the rear part of the vehicle body. The rear side frame 7 is No. 5 By connecting with the cross member 9, the torsional rigidity of the rear side frame 7 can be improved.

Since the first tire house reinforcing member 30 of the tire house reinforcing member 70 is connected to the vehicle width direction outer side portion 15 of the rear floor panel 13 forming the second closed cross-section portion 24, the rear side frame 7 is connected by the first tire house reinforcing member 30. It can be directly reinforced, and the deformation suppression and torsional rigidity of the rear part of the vehicle body can be effectively increased.

No. No. 4 cross member 8 and a tire house reinforcing member 70 are provided, and a second tire house reinforcing member 40 is provided. 4 cross member 8 and no. Since the loop-shaped frame F is constituted by the cross member 9, the pair of left and right tire house reinforcing members 70, and the second tire house reinforcing member 40 so that the respective closed cross sections are substantially continuous, the rear floor panel 13 and the left and right tires A lattice-shaped strength frame can be formed on the house inner 11a so that each closed cross-section portion is substantially continuous, and the torsional rigidity of the rear vehicle body can be further increased.

Next, the rear body structure of the second embodiment will be described with reference to FIGS.
The rear body structure of the vehicle 1A employs third and fourth reinforcements 36 and 37 that partition the second closed cross-section 24 instead of the first and second reinforcements 34 and 35. The same main components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different components are described.

The third reinforcement 36 includes a node portion 36a that partitions the second closed cross-section portion 24 in the front-rear direction, an upper flange portion 36b, a lower flange portion 36c, and an intermediate flange portion 36d. The node portion 36a has a No. The 5 cross member 9 is disposed at the outer position in the vehicle width direction of the front surface portion 26. The upper flange portion 36b is formed by bending the upper end portion of the node portion 36a forward in the vehicle front-rear direction, and is joined to the horizontal plane portion 15c of the outer portion 15 in the vehicle width direction. The lower flange portion 36 c is formed by bending the lower end portion of the node portion 36 a forward in the vehicle front-rear direction, and is joined to the lower wall portion 20 c of the frame body 20. The intermediate flange portion 36d is formed by bending the outer end portion in the vehicle width direction of the node portion 36a forward in the vehicle front-rear direction, and is joined to the outer wall portion 20a of the frame body 20.

The fourth reinforcement 37 is located behind the third reinforcement 36 in the vehicle front-rear direction, and includes a node portion 37a that partitions the second closed cross-section portion 24 in the front-rear direction, an upper flange portion 37b, a lower flange portion 37c, An intermediate flange portion 37d is provided. The node portion 37a is a No. 5 The cross member 9 is disposed at a position outside the rear surface portion 27 in the vehicle width direction. The upper flange portion 37b is formed by bending the upper end portion of the node portion 37a rearward in the vehicle front-rear direction, and is joined to the horizontal surface portion 15c of the outer portion 15 in the vehicle width direction. The lower flange portion (not shown) is formed by bending the lower end portion of the node portion 37 a rearward in the vehicle front-rear direction, and is joined to the lower wall portion 20 c of the frame body 20. The intermediate flange portion 37d is formed by bending the outer end portion in the vehicle width direction of the node portion 37a rearward in the vehicle front-rear direction, and is joined to the outer wall portion 20a of the frame body 20.

As described above, the rigidity of the rear side frame 7 can be increased, and the rear side frame 7 can be prevented from being crushed when a load is input. In addition, from tire to No. It is possible to increase the transmission efficiency of the load in the vertical direction inputted to the 5-cross member 9, and to further suppress the deformation of the rear part of the vehicle body.

Next, the rear vehicle body structure of Embodiment 3 will be described with reference to FIGS.
The rear body structure of the vehicle 1B is No. 1 bonded to the lower surface of the rear floor panel 13. No. 5 with closed cross sections on the top and bottom of the rear floor panel 13 instead of the cross member 9. A 5 cross member 9A is employed. The same main components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different components are described.

  No. An upper rear cross member member 60 joined to the upper surface of the rear floor panel 13 and extending along the outer periphery of the spare tire pan 16 and joined to the pair of left and right first tire house reinforcing members 30; A lower rear cross member member 61 that is joined to the lower surface of the rear floor panel 13 and extends along the outer periphery of the spare tire pan 16 corresponding to the upper rear cross member member 60 is provided.

The upper rear cross member 60 includes an upper surface portion 60a, a front surface portion 60b bent downward from the front end portion of the upper surface portion 60a, a rear surface portion 60c bent downward from the rear end portion of the upper surface portion 60a, and a front surface portion 60b. A flange portion for joining to the upper surface of the rear floor panel 13 is integrally provided at the lower end side portion of the rear surface portion 60c.
The flange portion 31 a of the inner wall portion 31 of the first tire house reinforcing member 30 is joined to the upper surface portion 60 a of the upper rear cross member member 60.

On the left and right ends of the lower rear cross member 61 in the vehicle width direction, a lower surface 61a, a front surface 61b bent upward from the front end of the lower surface 61a, and bent upward from the rear end of the lower surface 61a. The rear surface portion 61c and the upper end side portions of the front surface portion 61b and the rear surface portion 61c are provided with flange portions for joining to the lower surface of the rear floor panel 13. On the left and right end portions in the vehicle width direction, a closed cross section is formed by the lower surface portion 61a, the front surface portion 61b, the rear surface portion 61c, and the lower surface of the rear floor panel 13. The left and right end portions of the front surface portion 61b and the rear surface portion 61c are provided with flange portions 61d and 61e for fixing to the inner wall portion 20b of the rear side frame 7 with bolts (not shown).

The lower rear cross member member 61 corresponding to the spare tire pan 16 has a lower surface portion 61a, a front surface portion 61b bent upward from the front end portion of the lower surface portion 61a, and a rear end of the lower surface portion 61a. A flange portion for joining to the lower end surface of the spare tire pan 16 is provided on the side portion, and a flange portion for joining to the lower surface of the rear floor panel 13 is provided on the upper end side portion of the front surface portion 61b. A closed cross section is formed at the center in the vehicle width direction by the lower surface portion 61a, the front surface portion 61b, the vertical wall portion of the front portion of the spare tire pan 16, and the lower surface of the rear floor panel 13.

From the above, No. Even if the shape of the 5-cross member 9A is formed along the spare tire pan 16, the torsional rigidity can be secured without impairing the spare tire accommodation performance. In addition, no. Since the 5 cross member 9A is not provided, the distance from the road surface can be secured and the floor of the luggage compartment can be lowered.
No. The 5 cross member 9A only needs to be arranged so as to avoid the spare tire pan 16, and is not limited to the shape of the present embodiment. For example, the 5 cross member 9A can be provided only on the lower surface or only the upper surface of the rear floor panel 13.

Next, the rear vehicle body structure of the fourth embodiment will be described with reference to FIGS.
The rear vehicle body structure of the vehicle 1 </ b> C is No. 1 bonded to the lower surface of the rear floor panel 13. A silencer 29 for silencing is attached to the 5 cross member 9B. The same main components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different components are described.

No. Two weld nuts 53 are provided on the upper surface of the lower surface portion 25 of the 5 cross member 9B adjacent to the central portion in the vehicle width direction. No. A mounting bracket 54 having a substantially U-shaped cross section is provided on the lower surface of the lower surface portion 25 of the 5 cross member 9B. By screwing the bolt 55 into the weld nut 53 via the mounting bracket 54, the mounting bracket 54 is set to No. 5 Secure to the cross member 9B.

The rectangular silencer 29 is arranged such that its long side is in the vehicle width direction, and the silencer 29 is supported on the flange portion of the mounting bracket 54 by a bolt 56 inserted into the flange portion of the silencer 29. As described above, the support rigidity of the silencer 29 can be ensured without newly installing a support member for the silencer 29.

Next, a modification in which the above embodiment is partially changed will be described.
1] In the above embodiment, the first tire house reinforcing member and No. 1 were used. 5 Cross members are connected, and the second tire house reinforcing member and No. 5 cross member are connected. Although the example which connected 4 cross members was demonstrated, at least the 1st tire house reinforcement member and No.4. By connecting the 5 cross member to the tire house, it is possible to prevent the tire house from falling down and torsional rigidity. The connection of the four cross members can be omitted.

2) In the above embodiment, the rear floor panel is divided into the central portion and the outer portion in the vehicle width direction, and the closed cross section is formed by the outer portion in the vehicle width direction and the rear side frame. The cross section can also be configured, and the present invention can also be applied to a vehicle having a rear side frame that independently forms a closed cross section.

3] In the above-described embodiment, the example in which the reinforcement is disposed at the diagonal position of the second closed cross-sectional portion has been described. It is only necessary to be able to connect the five cross members, and it is also possible to configure with a node member that partitions the second closed cross section.
4] In the above embodiment, no. Although the example which attaches a silencer to 5 cross members was demonstrated, the vehicle auxiliary machine is not restricted to a silencer, It is possible to attach another auxiliary machine.

5) In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention relates to a rear vehicle body structure including a front cross member and a rear cross member between a pair of left and right tire houses, and in particular, by connecting the rear cross member to a tire house reinforcing member, It is possible to prevent inward collapse and torsional rigidity of the vehicle body.

1, 1A, 1B, 1C Vehicle 4 Cargo space 7 Rear side frame 8 4 Cross members 9, 9A, 9B 5 cross member 10 cab side panel 11a tire house inner 11b tire house outer 13 rear floor panel 15 vehicle width direction outer side portion 16 spare tire pan 23 first closed cross section 24 second closed cross section 29 silencer 30 first tire house reinforcing member 34 First Reinforcement 35 Second Reinforcement 36 Third Reinforcement 37 Fourth Reinforcement 40 Second Reinforcement Member 50 Gusset Plate 60 Upper Rear Cross Member Member 61 Lower Rear Cross Member Member 70 Tire House Reinforcement member F Reverse portal frame

Claims (6)

A floor panel forming the floor of the passenger compartment, a pair of left and right cab side panels extending in the vehicle front-rear direction, a pair of left and right tire houses bulging inward in the vehicle width direction from the bottom of each cab side panel, and A vehicle rear body structure that includes a pair of left and right rear side frames that extend in the vehicle longitudinal direction from the tire house in the vehicle width direction and are joined to the floor panel.
Between the pair of left and right tire houses, a front cross member extending in the vehicle width direction, a rear cross member extending in the vehicle width direction behind the front cross member in the vehicle front-rear direction, the cab side panel, and the tire house, And a pair of left and right tire house reinforcing members joined together,
The tire body reinforcing member has a lower end joined to the floor panel and connected to the rear cross member. The rear cross member is joined to the lower surface of the floor panel and connected to the pair of left and right rear side frames and forms a first closed cross section with the floor panel,
The rear side frame forms an outer portion in the vehicle width direction of the floor panel and a second closed cross section,
The rear vehicle body structure according to claim 1, further comprising a reinforcement for connecting the rear cross member and the tire house reinforcing member inside the second closed cross section. 3. The rear body structure of the vehicle according to claim 2, wherein the tire house reinforcing member is connected to a vehicle width direction outer side portion of the floor panel forming the second closed cross section. A spare tire pan is provided between the pair of left and right tire houses to be recessed downward in the floor panel,
The rear cross member is joined to the upper surface of the floor panel and extends along the outer periphery of the spare tire pan, and is joined to the pair of left and right tire house reinforcing members, and the floor panel. 2. The rear vehicle body structure according to claim 1, further comprising: a lower rear cross member that is joined to a lower surface of the first rear cross member and extends along an outer periphery of the spare tire pan corresponding to the upper rear cross member. . Providing a tire house reinforcing member extension for connecting the front cross member and the tire house reinforcing member;
The front cross member, the rear cross member, the pair of left and right tire house reinforcing members, and the tire house reinforcing member extension portion constitute a loop-like frame connected so that each closed cross-section portion is substantially continuous. The rear body structure of a vehicle according to any one of claims 1 to 4. A vehicle auxiliary machine is installed below the floor panel,
The rear body structure of the vehicle according to claim 2, wherein a mounting portion for the vehicle accessory is provided on the rear cross member.