JP2007190935A - Vehicle body rear part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To economically improve the rigidity of a rear cross member mounted between left and right rear side members which have kick parts curved to the outside of a vehicle, and the connecting force of the rear cross member to the rear side members, without an increase of mass and an increase of cost. <P>SOLUTION: The rear cross members 2 mounted between the kick parts 10 curved to the outside of the vehicle of the left and right rear side members 1 of a vehicle body is constituted of a member 20 constituted of a front surface part 21 and a lower surface part 22 and having a substantial L-shape in cross section and a seat retainer 3 constituted of an upper surface part 31 and a rear surface part 32 and having a substantial reverse L-shape in cross section to support a cabin seat. The rear cross member 2 is made to have a closed section structure by connecting an upper edge of the front surface part 21 of the member 20 to a front edge of the upper surface part 31 of the seat retainer 3 and connecting a rear edge of the lower surface part 22 of the member 20 to a lower edge of the rear surface part 32 of the seat retainer 3. A terminal of the rear cross member 2 is connected to the rear side members 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rear structure of a vehicle body in which a rear cross member is bridged between kick portions that are curved toward the vehicle outer side of left and right rear side members of the vehicle body.

  Conventionally, as shown in FIG. 4, at the rear part of a vehicle body such as a wagon car, the left and right rear side members 1, 1 extending in the front-rear direction and the left and right rear side members 1, 1 are bridged in the vehicle width direction. A storage space S for storing a spare tire or the like by providing a container-like cargo floor panel 6 (FIG. 7) that bulges downward from the passenger compartment floor at a portion surrounded by the cross member 2 and the tail cross member 4. There is something that provided.

  In this case, in order to increase the lateral width of the storage space S, the left and right rear side members 1 and 1 have the above-described general part 1a with respect to the front side member general part 1a installed slightly near the vehicle body avoiding the rear wheel. A kick portion 10 that extends obliquely outward from the rear end of the vehicle via a curved portion 11 that curves outwardly and obliquely rearward is provided. Further, the kick portion 10 is curved and extended rearwardly from the rear end of the kick portion 10, and left and right rear side members are provided. The installation width between the rear end portions of 1, 1 is enlarged (see, for example, Patent Document 1).

  By the way, when another vehicle or the like collides from the rear of the vehicle body, the stress to the collision load is concentrated on the left and right rear side members 1 and 1 at the kick portion 10, and the rear end portion of the rear side member 1 has a curved portion 11 of the kick portion 10. There is a risk of bending deformation from the vehicle to the outside of the vehicle. Therefore, the rear cross member 2 is bridged between the kick portions 10 of both rear side members 1 to enhance the rigidity of the bending portion 11 against the bending deformation.

  As shown in FIGS. 5 to 7, the rear end portion of the rear side member 1 has a closed cross-section structure with an inner panel 13 having a substantially hat-shaped cross section that opens on the outer side of the vehicle, and an outer panel 14. Reinforced by an internal reinforcement 15. The upper surface of the rear side member 1 is connected to and supports the side edges of the passenger compartment floor panel 5.

  The conventional rear cross member 2 forms a closed cross section with the passenger compartment floor panel 5 by connecting upper and lower edge flanges of the member member 20 formed in an inverted hat shape to the lower surface of the passenger compartment floor panel 5. In the rear cross member 2, a seat retainer 3 made of a thick metal plate for supporting the rear seat and the like is provided at a part of the rear cross member 2 corresponding to an unillustrated rear seat and the like installed in the passenger compartment. It is provided along the lower surface. The front and rear widths of the side end of the member member 20 are enlarged at the side end on the vehicle outer side of the rear cross member 2, and the coupling flanges 23 and 25 projecting back and forth from the side end of the member member 20 are curved on the rear side member 1. It is connected to the side surface on the vehicle inner side from the position immediately before the part 11 to the kick part 10. A coupling flange 24 that projects from the lower surface side end of the member member 20 to the lower surface side of the rear side member 1 is coupled to the lower surface of the rear side member 1.

  A seat retainer 3 provided in the rear cross member 2 is positioned below the rear end of the rear seat, and an engagement means for the rear end of the rear seat is provided on a seat anchor 30 erected from the seat retainer 3 on the passenger compartment floor. The rear seat is supported by engaging.

However, the rear cross member 2 having a closed cross section between the member member 20 and the vehicle compartment floor panel 5 has a thin plate thickness of the vehicle compartment floor panel 5 and the rigidity of the entire rear cross member 2 cannot be said to be sufficient. Since the coupling force to the rear side member 1 of the passenger compartment floor panel 5 is weaker than the coupling force to the rear side member 1, the reinforcing effect of the kick portion 10 of the rear side member 1 against the bending deformation cannot be sufficiently exhibited. Therefore, the rear side member 1 is increased in thickness and the cross-sectional shape of the kick portion 10 is increased, and a bulkhead 16 for partitioning the inside of the cross-section is provided inside. An outer surface reinforcing plate 17 made of a thick metal plate having an L-shaped cross section is provided and reinforced so as to cover the connecting portion between the connecting flange 25 on the rear portion of the member 2 and the connecting flange 24 on the lower surface.
JP 2001-55163 A

  In the conventional structure, the thickness of the rear side member 1 is increased, the cross-sectional shape of the curved portion 11 is increased, and the bulkhead 16 and the external reinforcing plate 17 are installed. It is. Therefore, the present invention increases the coupling strength between the rear side member and the rear cross member and effectively reinforces the kick portion of the rear side member by the rear cross member, so that the rear side member has a high rigidity of the rear side member with respect to a rear end collision load. An object of the present invention is to reduce the mass and cost economically without increasing the thickness of the rear side member or reinforcing the bulkhead and the reinforcing plate.

  The present invention relates to a rear structure of a vehicle body in which a rear cross member is mounted between kick parts bent toward the vehicle outer side of left and right rear side members of a vehicle body. An L-shaped member member, and a seat retainer that supports the passenger compartment seat with a substantially inverted L-shaped cross section composed of an upper surface portion and a rear surface portion, and an upper edge of the front surface portion of the member member and the seat retainer The rear cross member has a closed cross-sectional structure by connecting the rear edge of the lower surface of the member member and the lower edge of the rear surface of the seat retainer. The left and right terminals are joined to the left and right rear side members (claim 1). Since the rear cross member has a closed cross section formed by the member member and the seat retainer as a reinforcing member for supporting the rear seat, it is possible to achieve high rigidity, and both the member member and the seat retainer are coupled to the rear side member. Can be strong. Therefore, the rear cross member exhibits a high reinforcing effect and can enhance the rigidity of the rear side member with respect to the rear-end collision load from the rear of the vehicle body. As in the past, there is no need to increase the thickness and size of the rear side member, and to reinforce it with a bulkhead or reinforcing plate that is a separate member.

  The rear cross member connects a terminal on the front surface of the member member and a terminal on the rear surface of the seat retainer to the inner side surface of the rear side member, and connects a terminal on the upper surface of the seat retainer to the upper surface of the rear side member. At the same time, the end of the lower surface portion of the member member is coupled to the lower surface of the rear side member. A member member having a substantially L-shaped cross section and a seat retainer having a substantially inverted L-shaped cross section constitute a closed cross section, and two portions of the front end portion and the lower end portion of the member member are coupled to the inner side surface and the lower surface of the rear side member. In addition, since the two portions of the upper and rear end portions of the seat retainer are coupled to the upper surface and the vehicle interior side surface of the rear side member, the coupling balance between the member member and the seat retainer to the rear side member is good, and a high coupling force can be exhibited.

  A container-like cargo compartment floor panel is provided behind the rear cross member between the rear cross member of the left and right rear side members and the tail cross member, and the upper edge of the front standing portion of the cargo compartment floor panel. In addition, an extension part that bends from the upper edge and extends obliquely upward in the forward direction is formed, and the member member is coupled to the lower surface side of the extension part, while the seat retainer is coupled to the upper surface side of the extension part. And the bulkhead which partitions off the closed cross section of the rear cross member which a member member and a seat retainer make by the extension part is constituted. Since the bulkhead for partitioning the closed cross section of the rear cross member by the extending portion of the cargo compartment floor panel is configured, the rigidity of the rear cross member can be strengthened and the reinforcement performance to the rear side member can be improved.

  An embodiment in which the present invention is applied to the rear cross member 2 that spans between the curved portions 11 of the kick portions 10 and 10 of the left and right rear side members 1 and 1 shown in FIG. 4 will be described. The left and right rear side members 1 and 1 and the both ends of the rear cross member 2 are identical in structure to the left and right, and one of the coupling structures will be mainly described with reference to FIGS.

  The rear part of the vehicle body is surrounded by a left and right rear side member 1, 1 and a rear cross member 2, and a tail cross member 4 extending between the rear ends of the left and right rear side members 1, 1 in the vehicle width direction. A container-like storage space S that bulges downward from the passenger compartment floor is provided.

  As shown in FIGS. 1 to 3, the rear side member 1 kicks obliquely rearward to the vehicle outer side with respect to the front side member general portion 1 a through a curved portion 11 that curves from the rear end to the vehicle outer side and obliquely rearward. A portion 10 is formed, and the rear end portion of the rear side member 1 is curved from the rear end of the kick portion 10 and extends rearward.

  The rear side member 1 has an inner panel 13 having a substantially hat-shaped cross section that opens toward the vehicle outer side, and an upper edge and a lower edge coupled to an upper edge flange 131 and a lower edge flange 132 of the inner panel 13 in an upright posture. And an outer panel 14 that closes the opening on the outside of the vehicle. The interior of the rear side member 1 is reinforced by reinforcements 15 provided along the inner surface of the inner panel 13. In the reinforcement 15, the upper edge flange and the lower edge flange are integrally coupled to the joint portions of the upper edge and the lower edge of the inner panel 13 and the outer panel 14, respectively.

  The luggage compartment floor panel 6 constituting the storage space S is container-like, and an inclined portion that is bent from the upper edge and extends obliquely upward in the front is formed on the upper edge of the front rising portion 60 that stands up from the front edge of the bottom surface portion. And an extending portion 61 formed of a horizontal portion that is bent from the front edge of the inclined portion and extends horizontally forward. The luggage compartment floor panel 6 has a front edge of the extending portion 61 coupled to a rear edge of the passenger compartment floor panel 5. Although not shown in the drawing, the cargo floor panel 6 has upper edges of both side standing parts rising from the left and right side edges of the bottom part connected to the left and right rear side members 1, and a rear edge of the bottom part. The upper edge of the rear standing part rising from the tail cross member 4 is connected.

  A member member 20 constituting the rear cross member 2 that is a skeleton member of the vehicle body and a seat retainer 3 that supports a rear seat (not shown) are provided on the inclined portion of the extending portion 61 at the upper and lower positions, respectively. A rear cross member 2 is formed.

  The member member 20 is an elongate body having a length matching the gap between the curved portions 11 of the left and right rear side members 1, and is substantially L-shaped in cross section with a front surface portion 21 and a lower surface portion 22 that is bent from its lower edge and extends rearward. Make. The member member 20 has an upper edge flange that bends forward from the upper edge of the front surface portion 21 so as to overlap the lower surface of the horizontal portion of the extending portion 61 and bends downward from the rear edge of the lower surface portion 22. A rear edge flange is overlapped and joined to the front face of the upper end of the front standing part 60 of the cargo compartment floor panel 6.

  The seat retainer 3 is a long body having substantially the same length as that of the member member 20, and has an upper surface portion 31 and a rear surface portion 32 that is bent from the rear edge and extends downward to have a substantially inverted L-shaped cross section. The seat retainer 3 overlaps the front edge flange of the upper surface portion 31 with the upper surface of the joint portion between the upper edge flange of the member member 20 and the horizontal portion of the extension portion 61, and integrally couples them to each other. The lower edge flange of the surface portion 32 is overlapped with the rear surface of the joint portion between the rear edge flange of the member member 20 and the front standing portion 61 of the cargo compartment floor panel 6 and integrally joined thereto.

  As described above, the rear cross member 2 has a closed cross-sectional structure extending over the entire width between the curved portions 11 of the left and right rear side members 1 with the member member 20 and the seat retainer 3, and the cargo compartment with the member member 20 and the seat retainer 3. The inclined portion of the extending portion 61 of the floor panel 6 is configured to be sandwiched from above and below, and the inclined portion serves as a bulkhead that partitions the closed cross section of the rear cross member 2. The seat retainer 3 supports the rear seat by engaging the engaging means at the rear end of the rear seat with a seat anchor standing up toward the vehicle interior (not shown).

  The side end of the rear cross member 2, which forms a closed section with the member member 20 and the seat retainer 3, is coupled from the curved portion 11 to the kick portion 10 of the rear side member 1. A front side edge flange 23 that is bent from the side edge of the front surface portion 21 of the member member 20 and protrudes forward is formed at the side end of the rear cross member 2, and a rear side is formed on the side edge of the lower surface portion 22. A lower surface side edge 24 projecting downward from the member 1 and a coupling flange 26 bent downward from the end edge of the lower surface side edge 24 are formed.

  The lateral end of the seat retainer 3 on the vehicle outer side is formed so that its front-rear width gradually increases from the curved portion 11 of the rear side member 1 toward the rear along the kick portion 10. An upper surface side edge portion 33 is formed at the side end portion of the seat retainer 3 so as to protrude from the side edge of the upper surface portion 31 to the lower side of the rear side member 1, and the rear edge of the rear side member 1 is formed on the side edge of the rear surface portion 32. A rear side edge flange 34 that protrudes rearward along the kick portion 10 is formed.

  The rear cross member 2 is configured such that the front side edge flange 23 of the member member 20 is overlapped and coupled to the vehicle inner side surface at a position immediately before the curved portion 11 of the rear side member 1, and the lower surface side edge 24 is connected to the kick portion from the curved portion 11. The coupling flange 26 is overlapped with the lower edge coupling portion of the rear side member 1 and integrally coupled. On the other hand, the seat retainer 3 overlaps the upper surface side edge portion 33 with the upper surface portion from the curved portion 11 to the kick portion 10 of the rear side member 1 and joins the rear surface side edge flange 34 to the kick portion 10. It is overlapped and joined to the inner side of the car.

  According to this embodiment, since the rear cross member 2 has a closed cross-section structure with the member member 20 and the seat retainer 3 as a reinforcing member, the conventional structure in which the rear cross member 2 has a closed cross section with the vehicle compartment floor. Can be higher. Further, since a bulkhead is formed in the closed cross section of the rear cross member 2 so as to partition the closed cross section with the extending portion 61 of the cargo floor panel 6, higher rigidity is achieved. Further, since the highly rigid member member 20 of the rear cross member 2 and the side end of the seat retainer 3 on the outside of the vehicle are both coupled to the rear side member 1, the coupling force to the rear side member 1 can be increased.

  In this case, the rear cross member 2 having a substantially L-shaped cross section has two portions of the front side edge flange 23 and the lower surface side end 24, and the seat retainer 3 having a substantially reverse L-shaped cross section has its upper surface side edge 33 and the rear surface. Since the two portions of the side edge flange 34 are respectively connected to the rear side member 1, the top and bottom front and rear positions of the side end outer periphery of the rear cross member 2 can be connected to the rear side member in a well-balanced manner and a high binding force can be exhibited. Further, a coupling flange 26 is formed on the lower end 24 of the member member 20 and is coupled to the lower edge flange of the rear side member 1 to increase the number of coupling points between the rear side member 1 and the rear cross member 2. Strength can be strengthened.

  As described above, in the present embodiment, the rigidity of the rear cross member 2 is enhanced and the coupling force of the coupling portion between the curved portion 11 of the rear side member 1 and the rear cross member 2 is enhanced. High reinforcement performance to reinforce. Therefore, the rigidity of the rear side member 1 with respect to the rear-end collision load at the time of the rear-end collision of the vehicle can be strengthened without increasing the thickness of the rear-side member 1 or increasing its size, and without reinforcing it with a bulkhead or a reinforcing plate made of another member. . In addition, an economical structure that does not increase mass or increase costs is sufficient. In the above-described embodiment, the bulkhead is configured by the extending portion 61 of the cargo compartment floor panel 6 in the closed cross section of the rear cross member 2, but the bulkhead is not necessarily required, and the member member 20, the seat retainer 3, A simple closed cross section may be formed.

It is a principal part top view which shows the coupling | bond part of the rear side member of a vehicle body rear part structure of this invention, and a rear cross member. It is a longitudinal cross-sectional view in the position which follows the II-II line of FIG. It is a longitudinal cross-sectional view in the position which follows the III-III line | wire of FIG. FIG. 4 is a plan view showing a vehicle body rear structure including a rear side member, a rear cross member, a storage space, and a tail cross member. FIG. 6 is a plan view of a principal part showing a connecting portion between a rear side member and a rear cross member of a conventional vehicle body rear structure. It is a longitudinal cross-sectional view in the position which follows the VI-VI line of FIG. It is a longitudinal cross-sectional view in the position which follows the VII-VII line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear side member 10 Kick part 11 Curved part 13 Inner panel 14 Outer panel 2 Rear cross member 20 Member member 21 Front surface part 22 Lower surface part 23 Front side edge flange (terminal)
24 Lower side edge (terminal)
26 Connecting flange 3 Sheet retainer 31 Upper surface portion 32 Rear surface portion 33 Upper surface side edge (terminal)
34 Rear side flange (end)
4 Tail cross member 6 Cargo floor panel 60 Front part 61 Extension part

Claims (3)

In the rear structure of the vehicle body, the rear cross member is laid between the kick parts bent toward the outside of the left and right rear side members of the vehicle body.
The rear cross member is constituted by a member member having a substantially L-shaped cross section composed of a front surface portion and a lower surface portion, and a seat retainer for supporting a vehicle compartment seat having a substantially reverse L-shaped cross section composed of an upper surface portion and a rear surface portion. ,
The upper edge of the front surface of the member member is coupled to the front edge of the upper surface of the seat retainer, and the rear edge of the lower surface of the member member is coupled to the lower edge of the rear surface of the seat retainer. The rear cross member has a closed cross-sectional structure,
A vehicle body rear structure characterized in that left and right terminals of a rear cross member are coupled to left and right rear side members.   The rear cross member connects a terminal on the front surface of the member member and a terminal on the rear surface of the seat retainer to the inner side surface of the rear side member, and connects a terminal on the upper surface of the seat retainer to the upper surface of the rear side member. The vehicle body rear part structure according to claim 1, wherein a terminal of the lower surface portion of the member member is coupled to the lower surface of the rear side member. A container-like cargo compartment floor panel is provided behind the rear cross member between the rear cross member of the left and right rear side members and the tail cross member, and the upper edge of the front standing portion of the cargo compartment floor panel. Forming an extended portion that bends from the upper edge and extends obliquely upward in the forward direction;
The member member is coupled to the lower surface side of the extension portion, while the seat retainer is coupled to the upper surface side of the extension portion, and the closed cross section of the rear cross member formed by the member member and the seat retainer by the extension portion The vehicle body rear part structure according to claim 1 or 2, wherein a bulkhead for partitioning the vehicle is configured.