JP2007302200A - Front structure for vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front structure for a vehicle body capable of certainly absorbing a collision load by a bumper reinforcement. <P>SOLUTION: The bumper reinforcement 20 and a front side member 12 are connected through an impact absorption part 14, a wire 22 is laid along the front surface of the bumper reinforcement 20, and the wire 22 is connected to the front side member 12 behind the impact absorption part 14. Thereby, not only the strength of the bumper reinforcement 20 and strength generated by the tension of the wire 22 are applied, and the risk of the generation of the bending and folding of the bumper reinforcement 20 can be reduced. Further, since the collision load can be transmitted to the front side member 12 behind the impact absorption part 14, the collision load can be applied in the axial direction of the impact absorption part 14, and the collision load can be certainly absorbed by crushing the impact absorption part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a front structure of a vehicle body.

2. Description of the Related Art Conventionally, a structure for absorbing an impact at the time of a collision is employed in a front structure of a vehicle body in various vehicles such as a passenger car. As a front structure of this type of vehicle body, the front end portions of a pair of front side members extending in the front-rear direction of the vehicle are branched into a Y shape in a plan view, and the bumper rein A structure for supporting a hosement from the rear is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2000-21115

  Here, in recent years, it is desired to absorb the collision load. And compared with the prior art of the said patent document 1, it is calculated | required to absorb the collision load in bumper reinforcement more efficiently. In the prior art described in Patent Document 1, for example, when a collision with a pole or the like extending in the vertical direction, a load is applied to a part of the bumper reinforcement, and the bumper reinforcement is curved at this part, There is a possibility that the collision load that can be received by the bumper reinforcement is reduced.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a front structure of a vehicle body that can reliably absorb a collision load by a bumper reinforcement.

  A front structure of a vehicle body according to the present invention is a front structure of a vehicle body in a vehicle, which is disposed on both sides in the vehicle width direction and extends in the vehicle front-rear direction, and a front end portion of the front side member. And a bumper reinhose that extends in the vehicle width direction and is connected to the front side member via the shock absorbing portion. And a wire stretched along the front surface of the bumper reinforcement and connected to the front side member, and the wire is connected to the front side member on the rear side of the shock absorbing portion. .

  In such a front structure of the vehicle body, the bumper reinforcement and the front side member are connected via the shock absorbing portion, and a wire is stretched along the front surface of the bumper reinforcement. It is connected with the front side member on the rear side of. According to this structure, in addition to the strength of the bumper reinforcement, strength due to the tension of the wire is added, and it is possible to reduce the possibility that the bumper reinforcement will be bent or broken. Since the load acting on the wire can be dispersed as the tension of the wire and transmitted to the front side member on the rear side of the shock absorbing portion, for example, it collides with a pole or the like extending in the vertical direction, so that 1 of the bumper reinforcement Even when a collision load is applied to the point, the collision load is dispersed by the wire, and the collision load related to the bumper reinforcement can be reduced. In addition, since the wire is coupled to the front side member on the rear side of the shock absorbing portion, a load can be reliably applied to the shock absorbing portion by the tension of the wire when a collision occurs. As a result, the impact absorbing portion is crushed and the collision load is reliably absorbed. Further, since the wire does not generate a reaction force against the compression, there is no possibility of causing the front side member to bend in the case of an offset collision or the like. The attachment position of the wire may be directly attached to the rear side of the shock absorbing part, may be attached to the front side member behind the shock absorbing part, or other parts sandwiched between the shock absorbing part and the front side member. You may attach to a member.

  Here, as a preferable configuration exhibiting the above-described action, a configuration in which a guide portion that is provided on the front side of the bumper reinforcement and guides the position of the wire is formed. Thereby, a wire can be reliably arrange | positioned along the front surface of a bumper reinforcement, and a collision load can be reliably disperse | distributed as tension | tensile_strength of a wire.

  The bumper reinforcement has a protruding portion that protrudes outward from the front side member in the vehicle width direction, and the wire passes through the front side of the protruding portion and is connected to the front side member from the outside in the vehicle width direction. It is preferable. As a result, the tension of the wire can be applied to the front side member with the projecting portion as a fulcrum, and the load in the front-rear direction can be reliably applied to the impact absorbing portion. As a result, the impact load can be reliably absorbed by crushing the impact absorbing portion in the axial direction (front-rear direction).

  Moreover, it is preferable that the protrusion is bent to the rear side in the front-rear direction of the vehicle. Thereby, a collision load can be made to act on an impact-absorbing part more reliably via a wire.

  According to the front structure of the vehicle body of the present invention, the collision load can be dispersed by the wire stretched along the front surface of the bumper reinforcement and the load can be reliably applied to the shock absorbing portion. Thus, it is possible to provide the front structure of the vehicle body that can reliably absorb the collision load.

  Hereinafter, a preferred embodiment of the vehicle body front structure of the present invention will be described with reference to the drawings. 1 is a perspective view showing a front structure of a vehicle body according to an embodiment of the present invention from the front side, FIG. 2 is a plan view of the front structure of the vehicle body shown in FIG. 1, and FIG. 3 is a vehicle body shown in FIG. It is a front view of the front part structure. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted. Further, in this specification, the forward direction when the vehicle is moving forward is defined as “front”, and terms such as “front”, “rear”, “left”, and “right” are used.

  1 to 4 is a front structure of a vehicle body such as a passenger car (vehicle). A pair of front side members 12 extending in the front-rear direction of the vehicle body are provided on the left and right sides of the front portion of the vehicle body. The front side member 12 is constituted by a hollow member having a square cross section.

  At the front end of the front side member 12, a hollow crush box (buckling member; impact absorbing portion) 14 having a square cross section is provided. The crush box 14 is a hollow member having a square cross section, and has a buckling strength (proof force against axial compression load; strength in the front-rear direction) smaller than that of the front side member 12. The front side member 12 and the crash box 14 are connected to each other by, for example, a bolt and nut mechanism (not shown) via flanges 16 and 18. A bumper reinforcement 20 is laid across the pair of front side members 12 via the crash box 14.

  The bumper reinforcement 20 extends in the vehicle width direction, is fixed to the front end of the crash box 14, and has a protruding portion 20a that protrudes outward from the pair of front side members 12 in the vehicle width direction. The bumper reinforcement 20 is curved in an arc shape so that the center in the vehicle width direction protrudes forward, and the protruding portion 20a extends obliquely rearward. The bumper reinforcement 20 has an open cross section, and a plurality of openings (guide portions) 20 c are formed in the front wall 20 b that constitutes the front surface of the bumper reinforcement 20.

  The opening 20c is for inserting a wire 22 to be described later. The opening 20c is spaced apart from the bumper reinforcement 20 by a predetermined distance in the vehicle width direction at approximately the center of the bumper reinforcement 20. For example, two openings 20c are provided for one wire 20. Yes.

  Here, the front structure 10 of the vehicle body of the present embodiment includes a wire 22 stretched along the front surface of the bumper reinforcement 20, and this wire 22 is connected to the front side member 12 behind the crash box 14. Has been. The wire 22 has a string shape or a belt shape that can transmit only tension, and may be any material that can withstand a collision load to some extent.

  For example, two wires 22 are installed apart from each other in the vertical direction, and extend in the vehicle width direction along the shape of the bumper reinforcement 20. A part of the wire 22 disposed on the front surface of the bumper reinforcement 20 is inserted into the opening 20 c and disposed on the back side of the front wall 20 b of the bumper reinforcement 20. Further, the wire 22 is connected to the front side member 12 via the end of the protruding portion 20 a of the bumper reinforcement 20.

  Fixing plates 24 for connecting the wire 22 to the front side member 12 behind the crash box 14 are installed at both ends of the wire 22. The wire 22 and the fixing plate 24 are joined together by welding, for example. The fixing plate 24 is sandwiched from the front and rear directions by the flanges 16 and 18 described above, and is connected by a bolt and nut mechanism.

  Next, a description will be given of an impact absorbing action when a passenger car including the front structure 10 of the vehicle body configured as described above collides with a pole P such as a road sign on the front side of the vehicle. FIG. 4 is a plan view showing a state where a vehicle having the front structure of the vehicle body shown in FIG.

  As shown in FIG. 4, when the vehicle collides with the pole P, the bumper reinforcement 20 curves backward with the contact portion with the pole P as a base point. In the front body structure 10 of the vehicle body of the present embodiment, the wire 22 is stretched in the vehicle width direction along the front surface of the bumper reinforcement 20, so that it depends on the tension of the wire 22 in addition to the strength of the bumper reinforcement 20. Strength is added and the collision load can be dispersed by the tension T of the wire 22. Thereby, the possibility that the bumper reinforcement 20 may break at the collision point with the pole P is reduced. Therefore, a decrease in load that can be received by the bumper reinforcement 20 is suppressed, and it is possible to sufficiently receive an impact due to a collision.

  The wire 22 is stretched in the vehicle width direction along the front surface of the bumper reinforcement 20, and both ends of the wire 22 are connected to the front side member 14 via the fixing plate 24 at the rear of the crash box 14. Yes. Thereby, when it collides with the pole P, the wire 22 is pulled from the contact part with the pole P as a starting point. Then, the tension by the wire 22 is transmitted, and the crash box 14 is sandwiched between the bumper reinforcement 20 and the fixing plate 24 and can reliably receive a collision load, and is preferably crushed in the axial direction (the longitudinal direction of the vehicle). The Thus, since the crash box 14 is crushed, the collision load can be absorbed reliably, and the possibility that the front side member 14 is folded sideways is reduced.

  The bumper reinforcement 20 has a protruding portion 20a that protrudes outward from the front side member 12 in the vehicle width direction, and the wire 22 passes through the front side of the protruding portion 20a from the outside in the vehicle width direction. Since it is connected to the side member 12, the tension of the wire can be applied to the front side member 12 with the protruding portion 20a as a fulcrum, and the load in the front-rear direction can be applied to the crash box 14 more reliably. As a result, the crash box 14 is crushed in the axial direction, so that the impact load is more reliably absorbed.

  Moreover, it is preferable that the protrusion 20a is bent toward the rear side of the vehicle. Thereby, the collision load can be applied to the crash box 14 via the wire 22 more reliably.

  Further, the bumper reinforcement 20 has an opening 20c formed in the front wall 20b, and the position of the wire 22 can be guided by inserting the wire 22 through the opening 20c. Thereby, since the wire 22 can be reliably arranged along the front surface of the bumper reinforcement 20, the collision load can be reliably dispersed as the tension of the wire 22.

  As mentioned above, although this invention was concretely demonstrated based on the embodiment, this invention is not limited to the said embodiment. In the above embodiment, the guide part for guiding the position of the wire 22 is the bumper reinforcement 20 in which the opening 20c is formed. However, the guide part is configured to be able to restrain the wire 22 to the front surface of the bumper reinforcement 20. Any other configuration may be used, for example, a bumper reinforcement including a groove for guiding the position of the wire and a locking claw for restraining the movement of the wire.

  In the above embodiment, the wire 22 is connected to the front side member 12 via the fixing plate 24, but the wire 22 may be directly connected to the front side member 12. Further, the wire 22 may be connected to the front side member 12 via another member (for example, a radiator support) disposed between the crash box 14 and the front side member 12. Further, the wire 22 may be directly fixed to the rear portion of the crash box 14. The point is that the wire 22 stretched along the front surface of the bumper reinforcement 20 may be connected to the front side member 12 on the rear side of the crash box 14.

It is a perspective view which shows the front part structure of the vehicle body which concerns on embodiment of this invention from the front side. It is a top view of the front part structure of the vehicle body shown in FIG. It is a front view of the front part structure of the vehicle body shown in FIG. It is a top view which shows a state when the vehicle provided with the front part structure of the vehicle body shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Front part structure of vehicle body, 12 ... Front side member, 14 ... Crash box (shock absorption part), 20 ... Bumper reinforcement, 20a ... Projection part, 20b ... Front wall, 20c ... Opening part, 22 ... Wire.

Claims (4)

A front structure of a vehicle body in a vehicle,
A pair of front side members disposed on both sides in the vehicle width direction and extending in the front-rear direction of the vehicle;
An impact absorbing portion provided at a front end portion of the front side member and having a strength in a longitudinal direction of the vehicle that is smaller than a strength of the front side member;
A bumper reinforcement extending in the vehicle width direction and connected to the front side member via the shock absorbing portion;
A wire stretched along the front surface of the bumper reinforcement and connected to the front side member,
The front structure of the vehicle body, wherein the wire is connected to the front side member on the rear side of the shock absorbing portion.   2. The front structure of a vehicle body according to claim 1, wherein a guide portion is provided on a front side of the bumper reinforcement and guides the position of the wire. The bumper reinforcement has a protruding portion that protrudes outward from the front side member in the vehicle width direction,
The front structure of a vehicle body according to claim 1 or 2, wherein the wire passes through the front side of the protruding portion and is connected to the front side member from the outside in the vehicle width direction.   4. A front structure of a vehicle body according to claim 3, wherein the protruding portion is bent toward the rear side in the front-rear direction of the vehicle.

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