JP2009120063A - Vehicle body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body structure capable of sufficiently improving a reaction force of a vehicle at a side collision.
A vehicle body frame 1 includes a rear side member 4 that extends in the front-rear direction of the vehicle, and a rear floor cross member 5 and a center floor cross member 6 that are joined to the rear side member 4 and extend in the width direction of the vehicle. . The rear side member 4 and the rear floor cross member 5 are fixed with a reinforcing member 7 for suppressing deformation of the rear side member 4 that occurs when the vehicle is side impacted. The reinforcing member 7 is composed of a substantially flat brace joined to the rear side member 4 and the rear floor cross member 5. The brace 7 extends obliquely with respect to the rear side member 4 and the floor cross members 5 and 6 from the joint portion between the rear side member 4 and the center floor cross member 6 to the rear floor cross member 5.
[Selection] Figure 1

Description

  The present invention relates to a vehicle body structure having a side member and a cross member.

As a conventional vehicle body structure, for example, as described in Patent Document 1, two side members that are disposed on both sides of the vehicle and extend in the front-rear direction of the vehicle are disposed between the side members. Further, there is known a cross member that includes a cross member extending in the width direction of the vehicle and in which the side member and the cross member are coupled by a substantially semi-breadle-shaped brace.
Japanese Patent Laid-Open No. 10-338161

  However, in the above-described prior art, the rigidity with respect to the load input in the longitudinal direction and the vertical direction of the vehicle is ensured, but the rigidity with respect to the load input in the width direction of the vehicle is not considered at all. For this reason, the side member may be deformed by a load input at the time of a side collision, and a sufficient reaction force may not be obtained.

  The objective of this invention is providing the vehicle body structure of the vehicle which can fully improve the reaction force of the vehicle at the time of a side collision.

  The present invention is a vehicle body structure including a side member extending in the front-rear direction of a vehicle and a first cross member joined to the side member and extending in the width direction of the vehicle. On the other hand, it has braces joined to the side member and the first cross member so as to extend obliquely, and includes a reinforcing member for suppressing deformation of the side member that occurs during a side collision.

  In such a vehicle body structure, by providing a reinforcing member having braces joined to the side member and the first cross member so as to extend obliquely with respect to the side member and the first cross member, the vehicle can be Even if the load at the time of the collision is input to the vehicle, the load is received by the reinforcing member. Therefore, deformation of the side member can be suppressed by the reinforcing member, and the reaction force of the vehicle can be sufficiently improved.

  Preferably, the first cross member further includes a second cross member joined to the side member in front of or behind the first cross member and extending in the width direction of the vehicle, and the brace extends from the joint portion between the side member and the second cross member. It extends to. In this case, since the brace itself becomes longer according to the distance between the first cross member and the second cross member, the load input to the vehicle at the time of a side collision is sufficiently received by the reinforcing member. Thereby, deformation of the side member can be further suppressed.

  Preferably, the reinforcing member is integrated with the brace and has a fuel tank mounting bracket for mounting the fuel tank to the vehicle body. In this case, since the reinforcing member also has a fuel tank mounting bracket, the reaction force of the vehicle can be sufficiently improved while reducing the number of parts.

  ADVANTAGE OF THE INVENTION According to this invention, the deformation of the side member when a vehicle is collided can be suppressed, and the reaction force of a vehicle can fully be improved. Thereby, it is possible to sufficiently reduce the influence on the occupant.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a vehicle body structure according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a first embodiment of a vehicle body structure according to the present invention, and FIG. 2 is a schematic plan view of the vehicle body structure shown in FIG. In each of the drawings, a body frame 1 constituting the vehicle body structure of the present embodiment is disposed on both the left and right sides of the vehicle, and a pair of side members 2 (only one is shown in FIGS. 1 and 2) extending in the vehicle front-rear direction. And a plurality of cross members 3 joined to the side members 2 and extending in the width direction of the vehicle. The side member 2 and the cross member 3 are formed of a steel plate having a hat-shaped cross section.

  The side member 2 has a rear side member 4 coupled to a front side member (not shown). A rear floor cross member 5 and a center floor cross member 6 constituting a part of the plurality of cross members 3 are joined to the rear side member 4. The rear floor cross member 5 is disposed behind the center floor cross member 6. A fuel tank mounting bracket for mounting the fuel tank is fixed to the rear floor cross member 5 although not shown.

  At the upper end of the rear side member 4, two protruding edge portions 4a projecting outward are provided. Similarly to the rear side member 4, two protruding edges 5 a are provided at the upper end of the rear floor cross member 5, and two protruding edges 6 a are provided at the upper end of the center floor cross member 6.

  A reinforcing member 7 is fixed to the rear side member 4 and the rear floor cross member 5 for suppressing deformation of the rear side member 4 that occurs when the vehicle undergoes a side collision (side collision). The reinforcement member 7 is comprised from the brace which has the flat form arrange | positioned between the rear side member 4 and the rear floor cross member 5, as shown in FIGS. In FIG. 3, the center floor cross member 6 is omitted. The brace (reinforcing member) 7 is formed of the same steel plate as the side member 2 and the cross member 3, for example.

  A protruding edge 7 a is provided at the upper end of the brace (reinforcing member) 7, and an protruding edge 7 b is provided at one end of the brace 7 (end on the rear side member 4 side). In addition, you may provide an edge part also in the other end part (end part by the side of the rear floor cross member 5) of the brace 7. FIG.

  One end of the brace 7 is joined to the side surface of the rear side member 4 on the vehicle inner side, and the other end of the brace 7 is joined to the side surface of the rear floor cross member 5 on the vehicle front side. At this time, the projecting edge portion 7a of the brace 7 is joined to the projecting edge portion 4a of the rear side member 4 and the projecting edge portion 5a of the rear floor cross member 5, and the projecting edge portion 7b of the brace 7 is inside the vehicle of the rear side member 4. It is joined to the side.

  The brace 7 extends from a joint portion between the rear side member 4 and the center floor cross member 6 toward a portion corresponding to a fuel tank mounting position (not shown) in the rear floor cross member 5 and the rear side member 4, the rear floor cross member 5 and The center floor cross member 6 extends obliquely. Further, the brace 7 has a tapered shape that tapers from the center floor cross member 6 side toward the rear floor cross member 5 side in accordance with the height dimension of the joint portion of the rear side member 4 and the rear floor cross member 5. Yes.

  By the way, when the above-described reinforcing member 7 is not provided, the following problems occur. That is, when the vehicle collides with another vehicle, particularly when the vehicle to be damaged collides with the rear side of the damaged vehicle, as shown in FIG. 4, the rear side member 4 is connected to the rear side member 4 via a rear rocker (not shown). A load may be input. In this case, the rear side member 4 is deformed so as to bend toward the inside of the vehicle, and the deformation of the damaged vehicle is increased.

  On the other hand, in the present embodiment, since the brace (reinforcing member) 7 is provided between the rear side member 4 and the rear floor cross member 5, the rear rocker ( Even if a load is input to the rear side member 4 via the not shown), the load is received by the reinforcing member 7. At this time, one end portion of the brace 7 is joined to a joint portion of the rear side member 4 with the center floor cross member 6, and the other end portion of the brace 7 is located at a highly rigid portion corresponding to the fuel tank mounting position on the rear floor cross member 5. Since they are joined, the input load is effectively received by the reinforcing member 7. Therefore, the deformation of the side member 4 is sufficiently suppressed by the reinforcing member 7. Further, by providing the reinforcing member 7 between the rear side member 4 and the rear floor cross member 5, the support pitch when the rocker or the rear side member 4 is considered as a beam is shortened. As described above, the reaction force of the damaged vehicle at the time of a side collision can be sufficiently increased. As a result, it is possible to minimize the amount of deformation of the damaged vehicle and sufficiently reduce the influence on the passenger.

  FIG. 5 is a perspective view showing a second embodiment of a vehicle body structure according to the present invention. In the figure, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, a vehicle body frame 10 constituting the vehicle body structure of the present embodiment includes a reinforcing member 11 instead of the reinforcing member 7 in the first embodiment. As shown in FIG. 6, the reinforcing member 11 has a structure in which a brace 12 having a flat plate shape and a fuel tank mounting bracket 13 for mounting a fuel tank (not shown) are integrated. In FIG. 6, the center floor cross member 6 is omitted. The reinforcing member 11 is formed of, for example, the same steel plate as the reinforcing member (brace) 7 described above.

  A protruding edge 12 a is provided at the upper end of the brace 12, and a protruding edge 12 b is provided at one end of the brace 12 (the end on the rear side member 4 side). In addition, you may provide an edge part also in the other end part (end part by the side of the rear floor cross member 5) of the brace 12. FIG.

  One end of the brace 12 is joined to the side surface of the rear side member 4 on the vehicle inner side, and the other end of the brace 12 is joined to the side surface of the rear floor cross member 5 on the vehicle front side. At this time, the protruding edge 12 a of the brace 12 is joined to the protruding edge 4 a of the rear side member 4 and the protruding edge 5 a of the rear floor cross member 5, and the protruding edge 12 b of the brace 12 is inside the vehicle of the rear side member 4. It is joined to the side.

  The brace 12 extends from a joint portion between the rear side member 4 and the center floor cross member 6 toward a portion corresponding to the fuel tank mounting position in the rear floor cross member 5, and the rear side member 4, the rear floor cross member 5, and the center floor cross member 6. It extends diagonally with respect to. Further, unlike the brace 7 described above, the width dimension of the brace 12 is generally the same.

  The fuel tank mounting bracket 13 is fixed to the rear floor cross member 5. The fuel tank mounting bracket 13 is disposed so as to face the brace 12 between the projecting portion 13a and the protruding edge portion 13b arranged at intervals in the width direction of the vehicle, and between the protruding portion 13a and the protruding edge portion 13b. Wall 13c. The rear floor cross member 5 is placed on the protruding portion 13a and the protruding edge portion 13b. And the protrusion part 13a and the protruding edge part 13b, and the lower surface of the rear floor cross member 5 are joined, and the wall part 13c and the rear side surface of the rear floor cross member 5 are joined.

  In this embodiment, since the reinforcing member 11 having the brace 12 disposed between the rear side member 4 and the rear floor cross member 5 is provided, the vehicle is side-impacted as in the first embodiment. Thus, even if a load is input to the rear side member 4, the deformation of the rear side member is suppressed, and the reaction force of the damaged vehicle can be sufficiently increased.

  Further, since the reinforcing member 11 in which the brace 12 and the fuel tank mounting bracket 13 are integrated is used, the dedicated fuel tank mounting bracket 13 is not necessary, and the number of parts can be reduced.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the reinforcing member is provided at the joint between the rear side member 4 and the rear floor cross member 5. However, the present invention is not limited to this configuration, and the rear side member 4 or the front side member (not shown) and the like. A reinforcing member may be provided at a joint portion with any cross member (for example, the center floor cross member 6).

1 is a perspective view showing a first embodiment of a vehicle body structure according to the present invention. It is a schematic plan view of the vehicle body structure of the vehicle shown in FIG. It is a disassembled perspective view of the vehicle body structure of the vehicle shown in FIG. FIG. 4 is a schematic plan view showing a state when a load is input to the rear side member when the reinforcing member shown in FIGS. 1 to 3 is not provided. It is a perspective view which shows 2nd Embodiment of the vehicle body structure of the vehicle concerning this invention. FIG. 6 is an exploded perspective view of the vehicle body structure shown in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Body frame (vehicle structure), 2 ... Side member, 3 ... Cross member, 4 ... Rear side member, 5 ... Rear floor cross member (1st cross member), 6 ... Center floor cross member (2nd cross member), 7 DESCRIPTION OF SYMBOLS Reinforcing member, 10 ... Body frame (body structure), 11 Reinforcing member, 12 Brace, 13 Fuel tank mounting bracket.

Claims (3)

A side member extending in the longitudinal direction of the vehicle;
A vehicle body structure including a first cross member joined to the side member and extending in a width direction of the vehicle,
A brace joined to each of the side member and the first cross member so as to extend obliquely with respect to the side member and the first cross member, and for suppressing deformation of the side member that occurs during a side collision. A vehicle body structure comprising a reinforcing member. A second cross member joined to the side member in front of or behind the first cross member and extending in the width direction of the vehicle;
The vehicle body structure according to claim 1, wherein the brace extends from a joint portion between the side member and the second cross member to the first cross member. The vehicle body structure according to claim 1 or 2, wherein the reinforcing member is integrated with the brace and includes a fuel tank mounting bracket for mounting the fuel tank to the vehicle body.

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