JP2006213093A - Car body front structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of dispersively receiving a collision load in a car body front structure of an automobile. <P>SOLUTION: In a head-on collision with the other vehicle, when a crush box is buckled and deformed, wall surface members 8 and 8 of a grating-shaped cross-sectional structure fixed to a front end of front side members 1 and 1, surely and dispersively receive the collision load in the plane direction. As a result, a concentration of the collision load applied to a car body of the other vehicle as reaction of a collision is restrained. The collision load transmitted to the front side members 1 and 1 from the wall surface members 8 and 8, is absorbed by buckling deformation of the front side members 1 and 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle body front structure having left and right front side members extending in the longitudinal direction of the vehicle body.

  Generally, left and right front side members extending in the longitudinal direction of the vehicle body are arranged at the front of the vehicle body, and a crash box (bumpy stay) that absorbs shocks in the event of a light collision on the front of the vehicle body is disposed at the front end of the vehicle. The front bumper is supported via the (see Patent Documents 1 and 2, for example).

  Here, in Patent Document 1, the front end portions of the left and right front side members (front frame / front) are stably buckled and deformed so that the collision energy can be effectively absorbed during a frontal collision of the vehicle body. Therefore, a structure in which the left and right front side members are connected by a tension bar has been proposed.

On the other hand, Patent Document 1 proposes a structure in which a crash box is formed integrally with a bumper reinforcement and the cross-sectional structure of the crash box is a honeycomb structure.
JP-A-9-169283 (abstract, FIG. 1) Japanese Patent Laid-Open No. 11-255049 (Abstract, FIG. 1)

  By the way, in the vehicle body front part structure described in patent document 1, when it collides with another vehicle, the site | part which is substantially the same height as the front side member in a vehicle front part structure becomes a structure which receives a collision load intensively. It was. Such a problem also applies to the structure of the front part of the vehicle body described in Patent Document 2.

  Therefore, an object of the present invention is to provide a structure capable of receiving a collision load in a distributed manner in a front body structure of an automobile.

  A vehicle body front structure according to the present invention is a vehicle body front structure having left and right front side members extending in the vehicle body longitudinal direction, and the front end portions of the left and right front side members are arranged in the vehicle longitudinal direction. A wall surface member having a lattice-like cross-sectional structure that receives a load distributed in a plane direction is fixed.

  In the front body structure of an automobile according to the present invention, the collision load is applied to the wall surface member having a lattice-like cross-sectional structure fixed to the front end portion of the front side member at the time of a frontal collision with the body of another vehicle. Here, if the wall member is a flat plate or the like, if the load applied to the collision site exceeds a certain amount, the collision site will be greatly deformed and cannot receive the collision load. Since the member receives the collision load dispersedly in the surface direction, the member is not greatly deformed, and the collision load can be reliably distributed without significantly reducing the load that can be received. The collision load received by the wall surface members in a distributed manner is reliably transmitted to the front side member.

  In the vehicle body front structure of the present invention, when the wall surface member is provided so as to extend in the vehicle body vertical direction from the front end portion of the front side member, the wall surface can be used even when a front collision occurs with an object having a height different from that of the front side member. The member can receive the collision load in a distributed manner in the plane direction. As a result, the concentration of the collision load applied to the object as a collision reaction is suppressed.

  In addition, the wall member is provided to extend from the front end of the front side member to at least the outer side in the vehicle body width direction, and the outer end of the wall member is disposed on the outer side in the vehicle width direction from the left and right front side members. When fixed to the upper member, the wall surface member is supported at two points, so when a collision load is applied to the wall surface member on the outer side in the vehicle width direction from the front side member (for example, in the case of an offset collision) In addition, the collision load can be reliably dispersed and received by the wall member, and the collision load can be reliably transmitted to the front side member and the upper member. The upper member is a skeleton member whose rear end portion extending in the longitudinal direction of the vehicle body is coupled to the dash panel or the front pillar, and includes an apron upper member, a front wheel house upper member, and the like.

  Here, if the left and right crash boxes that fasten the front ends of the left and right front side members and the front bumper reinforcement are provided through the wall surface member, the crash box can be used in the event of a light collision at the front of the vehicle body. Since only the buckling deformation and the collision load are absorbed, the wall member and the front side member are prevented from being deformed, and the number of parts replacement is reduced. The crash box is a member having a buckling strength lower than that of the front side member.

  In addition, if a reinforcing plate is attached to at least one of the front and rear surfaces of the wall member, the bending strength of the wall member increases, and the wall member reliably disperses the collision load during the frontal collision. It is preferable because it comes to receive.

  According to the vehicle body front structure according to the present invention, when a frontal collision with the body of another vehicle or the like occurs, the collision load is reliably distributed in the surface direction by the wall surface member fixed to the front end of the front side member. Can receive. As a result, it is possible to suppress the concentration of the collision load applied to the vehicle body of the other vehicle as a collision reaction.

  Here, when the wall surface member is provided so as to extend in the vehicle body vertical direction from the front end of the front side member, the wall surface member also applies a collision load in the surface direction even when a frontal collision occurs with an object having a height different from that of the front side member. Can be received in a distributed manner. As a result, it is possible to suppress the concentration of the collision load applied to the object as a collision reaction.

  The left and right upper members extending in the vehicle front-rear direction are provided with wall members extending from the front end of the front side member to at least the outer side in the vehicle body width direction, and the outer portions thereof are disposed on the outer side in the vehicle body width direction from the left and right front side members. Since the wall surface member is supported at two points, the collision load can be reliably distributed and received by the wall surface member even in the case of an offset collision. Then, it is possible to reliably suppress the concentration of the collision load applied to the vehicle body or the like of another vehicle as a collision reaction.

  In addition, when left and right crash boxes that pierce the front end parts of the left and right front side members and the front bumper reinforcement are provided through the wall member, only the crash box is used in the case of a light collision on the front of the vehicle body. Since the buckling is deformed to absorb the collision load, the wall member and the front side member can be prevented from being deformed and the number of parts replacement can be reduced.

  In addition, when a reinforcing plate is attached to at least one of the front surface or the rear surface of the wall surface member, the bending strength of the wall surface member increases. Can be received in a distributed manner.

  Embodiments of a vehicle body front structure according to the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a plan view schematically showing a front body structure of an automobile according to an embodiment, FIG. 2 is a perspective view showing a schematic structure of a wall member shown in FIG. 1, and FIG. FIG.

  As shown in FIG. 1, a vehicle body front structure according to an embodiment includes a pair of left and right front side members 1, 1 that extend in the longitudinal direction of the vehicle body, and an upper side outside the vehicle width direction from the front side members 1, 1. A pair of left and right upper members 2 and 2 extending in the longitudinal direction of the vehicle body, and a pair of left and right under members 3 and 3 extending inward of the vehicle body width direction from the front side members 1 and 1 and extending in the longitudinal direction of the vehicle body. ing.

  Below the upper members 2, 2, left and right wheels 4, 4 are arranged, and behind the under members 3, 3 an engine 5 is arranged. The rear ends of the undermembers 3 and 3 are connected to the engine 5.

  On the other hand, crash boxes 6 and 6 are connected to the front end portions of the front side members 1 and 1, and the front bumper reinforcement 7 is connected to the front side members along the vehicle body width direction via the crash boxes 6 and 6. 1 and 1 are supported in front.

  Here, wall members 8 and 8 having a lattice-like cross-sectional structure for receiving a collision load in the longitudinal direction of the vehicle body in a plane direction are fixed to the front end portions of the front side members 1 and 1 as a part of the front end structure. Yes.

  As shown in FIG. 2, the wall surface members 8 and 8 are made of, for example, an aluminum extruded material having a lattice-like cross-sectional structure in which a large number of square holes penetrate in the thickness direction, and the lattice surfaces are arranged with the front and rear directions in the vehicle body. . The wall surface members 8 and 8 are symmetrical in a rectangular shape in front view that extends from the front end of the front side members 1 and 1 (see FIG. 1) in the vertical direction of the vehicle body and extends slightly rearwardly in the vehicle width direction. The inner ends thereof are connected to each other via upper and lower front cross members 9 and 10.

  Here, through holes 8A and 8A through which the crash boxes 6 and 6 (see FIG. 1) are inserted are formed in the vicinity of the central portion in the vertical direction on the inner end side of the wall surface members 8 and 8. Moreover, near the upper part on the outer end side of the wall surface members 8 and 8, openings 8B and 8B in which a headlamp (not shown) is arranged are formed.

  As shown in FIG. 3, the rear end portion of the crash box 6 is inserted into the through hole 8A of the wall surface member 8 in a loosely fitted state so as to be capable of buckling deformation. The rear end portion of the crash box 6 is detachably fixed to a fastening plate 11 fixed to the front end portion of the front side member 1 through fastening means (not shown).

  On the other hand, a seat plate 12 is previously attached to a portion around the through hole 8A on the front surface of the wall member 8 by means such as welding, and a fastening plate on the rear surface side of the seat plate 12 and the wall member 8 is provided. 11 is fastened with bolts B and nuts N so that the inner end side of the wall member 8 is detachably fastened to the fastening plate 11 at the front end of the front side member 1. The outer end portions of the wall surface members 8 and 8 are fixed to the front end portion of the upper member 2 by appropriate means such as welding.

  In the vehicle body front structure of an embodiment of the present invention configured as described above, for example, as shown in FIGS. 4 to 7, when the host vehicle and another vehicle collide in the front (front) state in an offset state, the first At the stage (see FIG. 4), the front bumper reinforcement 7 of the host vehicle and the front bumper reinforcement A of the other vehicle collide.

  In the subsequent second stage (see FIG. 5), the front bumper reinforcement 7 of the host vehicle is pushed into the vicinity of the wall surface members 8 and 8 while being crushed by the front bumper reinforcement A of the other vehicle. At that time, a part of the collision load is absorbed by the buckling deformation of the crash boxes 6 and 6 (see FIG. 4). The remaining collision load is transmitted from the wall surface members 8, 8 to the front side members 1, 1 and the upper members 2, 2 and from the front cross member 10 to the under members 3, 3.

  In the next third stage (see FIG. 6), the wall members 8 and 8 and the front cross member 10 of the host vehicle are pushed backward by the front bumper reinforcement A of the other vehicle, so that the front side members 1 and 1 and The front end portions of the under members 3 and 3 are each buckled and deformed to absorb the collision load. At that time, one crash box B of the other vehicle is buckled and deformed by the reaction force of the collision.

  In the fourth stage (see FIG. 7), the wall members 8 and 8 and the front cross member 10 of the host vehicle are pushed to the vicinity of the engine 5 by the front bumper reinforcement A of the other vehicle. The front end of 1 further buckles and absorbs the collision load, and the front ends of the upper members 2 and 2 also buckle and absorb the collision load. At that time, the other crash box B of the other vehicle is also buckled and deformed by the reaction force of the collision.

  In such a frontal (frontal) collision between the host vehicle and another vehicle, in the second stage (see FIG. 5) and thereafter, the wall members 8 and 8 having a lattice-like cross-sectional structure distribute the collision load in the plane direction. Therefore, the concentration of the collision load applied to the front bumper reinforcement A of the other vehicle as a reaction of the collision is suppressed. As a result, the damage to other vehicles does not reach the front side members C and C, the upper members D and D, the front cross member E, etc., but only the front bumper reinforcement A and the vicinity of the crash boxes B and B are damaged. Damage is reduced.

  Further, the wall surface members 8 and 8 are fixed to the front end portion of the front side member 1 on the inner end side and fixed to the front end portion of the upper member 2 on the outer end side. 8 and the impact load is reliably transmitted to the front side members 1 and 1 and the upper members 2 and 2.

  That is, according to the vehicle body front structure of an embodiment of the present invention, a collision load can be reliably dispersed and received in the surface direction by the wall surface members 8 and 8 when a front (front) collision with another vehicle occurs. As a result, it is possible to suppress the concentration of a collision load applied to the vehicle body of another vehicle as a collision reaction.

  Here, in the vehicle body front part structure of an automobile according to an embodiment, the wall surface members 8 are provided so as to extend in the vehicle body vertical direction from the front end portions of the front side members 1, 1. Even when an object having a height different from the height position of 1 or 1 collides with the front surface, the collision load can be distributed and received by the wall surface members 8 and 8. As a result, it is possible to suppress the concentration of the collision load applied to the object as a collision reaction.

  Also, crash boxes 6 and 6 for connecting the front end portions of the front side members 1 and 1 and the front bumper reinforcement 7 are provided through the through holes 8A and 8A of the wall surface members 8 and 8 in a loosely fitted state. Therefore, when the host vehicle collides lightly with the vehicle body or other object of another vehicle, only the crash boxes 6 and 6 can buckle and absorb the collision load. It is possible to reduce the number of parts replacement by preventing the side members 1, 1 and the upper members 2, 2 from being deformed.

  Further, since the wall surface members 8 and 8 have a lattice-like cross-sectional structure in which a large number of holes penetrate along the longitudinal direction of the vehicle body, the passage of the traveling wind of the host vehicle is not hindered.

  The vehicle body front structure of the present invention is not limited to the above-described embodiment. For example, in order to increase the bending strength of the wall surface members 8 and 8 and to reliably disperse the collision load in the surface direction of the wall surface members 8 and 8, a reinforcing plate is attached to at least one of the front and rear surfaces of the wall surface members 8 and 8. You may set up.

  Further, the lattice-like cross-sectional structure of the wall surface members 8, 8 is a rhombus-like cross-sectional structure through which a large number of rhombus holes penetrate, a round lattice-like cross-sectional structure through which a large number of circular holes penetrate, or a hexagonal many holes. A cross-sectional honeycomb structure may be used. And the wall surface members 8 and 8 are not restricted to an aluminum extrusion material, and are good also as a product made from sheet metal.

  Further, in the example shown in FIG. 2, the left and right wall surface members 8, 8 are connected to each other by the front cross members 9, 10, but as shown in FIG. 8, the front cross members 9, 10 are also wall surface members 8, 8. A lattice-like cross-sectional structure integrated with the

It is a top view showing typically the body front part structure of the car concerning one embodiment of the present invention. It is a perspective view which shows schematic structure of the wall surface member shown in FIG. It is the III section enlarged view of FIG. It is a top view which shows typically the 1st step of the front collision of the own vehicle provided with the vehicle body front part structure of one Embodiment, and another vehicle. It is a top view which shows typically the 2nd step of the frontal collision with the own vehicle provided with the vehicle body front part structure of one Embodiment, and another vehicle. It is a top view which shows typically the 3rd step of the frontal collision with the own vehicle provided with the vehicle body front part structure of one Embodiment, and another vehicle. It is a top view which shows typically the 4th step of the front collision of the own vehicle provided with the vehicle body front part structure of one Embodiment, and another vehicle. It is a perspective view which shows schematic structure of the modification of the wall surface member shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front side member 2 Upper member 3 Under member 4 Wheel 5 Engine 6 Crash box 7 Front bumper reinforcement 8 Wall member 8A Through-hole 8B Opening 9 Front cross member 10 Front cross member 11 Fastening plate 12 Seat plate

Claims (5)

  A vehicle body front structure having left and right front side members extending in the longitudinal direction of the vehicle body, wherein the front end portions of the left and right front side members receive a load in the longitudinal direction of the vehicle body in a distributed manner. A vehicle body front structure, wherein a wall member having a cross-sectional structure is fixed.   The vehicle body front part structure according to claim 1, wherein the wall surface member is provided so as to extend in a vehicle body vertical direction from a front end part of the front side member.   The wall surface member is provided so as to extend from the front end portion of the front side member to at least the outer side in the vehicle body width direction, and the outer end portion is disposed on the outer side in the vehicle body width direction from the left and right front side members. The vehicle body front part structure according to claim 1, wherein the vehicle body front part structure is fixed to the upper member of the vehicle.   4. The left and right crash boxes that connect the front end portions of the left and right front side members and a front bumper reinforcement are provided through the wall surface member. Car body front structure. The vehicle body front part structure according to any one of claims 1 to 4, wherein a reinforcing plate is attached to at least one of a front surface and a rear surface of the wall member.

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