JP2015131545A - Vehicle body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively absorb collision energy in a vehicle body front structure.SOLUTION: A vehicle front structure comprises: a front bumper member 11 extending in a vehicle body width direction; an elastic member 14 which is formed into a circular arc shape projecting on the rear side of a vehicle body and whose both ends are fixed to the rear side face of the vehicle body of the front bumper member 11; and a holding member 15 which is provided to vehicle body lower frames 2, 3 to hold the elastic member 14 so as to be slidably movable in a circular arc direction. The elastic member 14 deforms to make the front bumper member 11 move to the rear side of the vehicle body accompanied with frontal collision with a collision body, and the elastic member 14 slidably moves in the circular arc direction accompanied with off-set collision with the collision body to turn the front bumper member 11.

Description

  The present invention relates to a vehicle body front structure, and more particularly to a vehicle body front structure of a cab-over type vehicle.

  The front body structure of a typical cab-over type vehicle is configured by fixing the front bumper to the front end of the chassis frame via a bumper bracket and arranging a front under lamp protector under the front bumper to prevent the passenger car from entering (For example, refer to Patent Document 1).

JP 2010-14396 A

  By the way, a bumper bracket of a general cab-over type vehicle has only a function of fixing a front bumper. Therefore, when a cab-over type vehicle collides with a collision object such as a passenger car in a frontal collision or an offset collision, the collision object is firmly received by the front bumper, and there is a problem that the collision energy given to the collision object cannot be absorbed.

  The objective of this invention is providing the vehicle body front part structure which can absorb effectively the collision energy at the time of a frontal collision or an offset collision with a to-be-collised body.

  In order to achieve the above-mentioned object, the vehicle body front structure of the present invention includes a front bumper member extending in the vehicle body width direction and an arc shape protruding to the vehicle body rear side, and both ends of the vehicle body rear side surface of the front bumper member. An elastic member fixed to the vehicle body, and a holding member provided on the lower frame of the vehicle body to hold the elastic member so as to be slidable in the arc direction. Then, the front bumper member is moved rearward of the vehicle body, and the elastic member slides in an arc direction in association with an offset collision with a collision target body to rotate the front bumper member.

  In addition, it is preferable that the holding member has a guide hole that allows the elastic member to be inserted and guides the elastic member so as to be movable in the arc direction.

  Moreover, it is preferable to provide a friction member for applying a friction force to the elastic member on the inner peripheral surface of the guide hole.

  A plurality of the elastic members may be provided, and at least a part of the elastic members may be disposed below the vehicle body lower frame.

  Further, the plurality of elastic members may be arranged at intervals in the vertical direction of the vehicle body.

  The elastic member may be formed of a leaf spring.

  According to the vehicle body front part structure of the present invention, it is possible to effectively absorb the collision energy when a frontal collision or an offset collision with a collision target.

It is a typical perspective view which shows the vehicle body front part structure which concerns on one Embodiment of this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. In the vehicle body front part structure of the present embodiment, (a) is a schematic top view showing a state of frontal collision with a collision target, and (b) is a schematic top view showing a state of offset collision with a collision target. FIG. It is a typical perspective view which shows the vehicle body front part structure which concerns on other embodiment.

  Hereinafter, a vehicle body front structure according to an embodiment of the present invention will be described with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, the vehicle body front structure 10 is applied to a cab-over type vehicle such as a truck, and includes a front bumper member 11, a bumper fixing member 12, a bumper side shock absorbing beam member 13, and a frame side. A shock absorbing beam member 14 and a holding member 15 are provided. In FIG. 1, reference numeral 2 denotes a pair of chassis frames extending in the longitudinal direction of the vehicle body, reference numeral 3 denotes a front end cross member spanned between the front end portions of the chassis frame 2, and reference numeral 4 denotes a pair of brackets (only on the left side of the vehicle body). Is shown).

  The front bumper member 11 has a bumper central portion 11A extending in the vehicle body width direction, and a bumper side portion 11B that bends backward from the both ends of the bumper central portion 11A. A plurality of vent holes 11C are provided at predetermined locations of the bumper central portion 11A to take the traveling wind into a fan sheroud (not shown) or the like. 1 to 3, the front bumper member 11 is shown in a state before being assembled to the bumper fixing member 12.

  The bumper fixing member 12 is formed in a substantially prismatic shape, and the front bumper member 11 is fixed to the front side surface of the vehicle body by bolt fastening or the like. Further, the bumper fixing member 12 is formed with three insertion holes 11 </ b> A penetratingly formed in the vehicle body width direction for inserting and holding a plurality (three in the present embodiment) of bumper side shock absorbing beam members 13. (See FIG. 2). The three insertion holes 11A are provided in the vertical direction of the vehicle body at a predetermined interval from each other (see FIG. 3). The bumper fixing member 12 has a function of bundling the three bumper side shock absorbing beam members 13, and even if a load is applied only to the bumper side shock absorbing beam member 13 at the bottom, The shock absorbing beam member 13 acts to receive a load.

  The bumper side impact absorbing beam member 13 is, for example, an elastically deformable leaf spring or the like, and is curved so as to follow the shape of the back surface of the front bumper member 11. Further, both end portions of the frame side shock absorbing beam member 14 are fixed to both ends of the bumper side shock absorbing beam member 13 in the vehicle body width direction by bolt fastening, welding, or the like.

  The frame-side shock absorbing beam member 14 is, for example, an elastically deformable leaf spring or the like, and is formed in a curved shape that protrudes rearward of the vehicle body. In the present embodiment, three frame side shock absorbing beam members 14 are provided so as to face the bumper side shock absorbing beam members 13 respectively. These three frame side impact absorbing beam members 14 are held by a holding member 15 so as to be slidable.

  The holding member 15 is formed in a substantially prismatic shape, and the rear side surface of the vehicle body is fixed to the front end cross member 3 and the bracket 4 by bolt fastening, welding, or the like. In addition, the holding member 15 is provided with three guide holes 15A through which the three frame side shock absorbing beam members 14 are inserted and slidably held in the arc direction (see FIG. 2).

  As shown in FIG. 2, the guide hole 15 </ b> A penetrates the holding member 15 in the vehicle body width direction, and is formed by curving the through path in an arc shape substantially equal to the curvature of the frame-side shock absorbing beam member 14. Yes. A friction member 16 made of rubber or the like that gives a frictional force to the frame-side shock absorbing beam member 14 is attached to the inner peripheral surface of the guide hole 15A. That is, the frame side shock absorbing beam member 14 is configured to allow sliding movement in the arc direction only when a predetermined external force or more is applied to the frame side shock absorbing beam member 14.

  Further, as shown in FIG. 3, the three guide holes 15A are provided side by side with a predetermined interval in the vertical direction of the vehicle body, and the lowermost guide hole 15A is formed at the lower side of the vehicle body than the chassis frame 2. . That is, by positioning the lowermost frame-side shock absorbing beam member 14 below the chassis frame 2, it is possible to prevent a passenger car or the like from entering. Thereby, the front under-run protector which is essential in the conventional cab-over type vehicle can be omitted.

  Next, the effect by the vehicle body front part structure 10 of this embodiment is demonstrated.

  As shown in FIG. 4A, when a cab-over type vehicle T on which the vehicle body front structure 10 of the present embodiment is mounted collides frontally with a collision object P such as a passenger car, the frame-side shock absorbing beam member 14 is covered. By elastically deforming in the direction in which the collision body P enters, the collision energy at the time of a frontal collision is effectively absorbed.

  Further, as shown in FIG. 4B, when the cab-over type vehicle T has an offset collision with the collision target P, the front bumper member 11 moves to the bumper side impact as the frame side shock absorbing beam member 14 slides. It rotates integrally with the absorption beam member 13. That is, the front bumper member 11 is configured so as to effectively absorb the collision energy at the time of the offset collision by turning in the entry direction of the collision target P and facing the collision target.

  Therefore, according to the vehicle body front structure 10 of the present embodiment, it is possible to effectively absorb the collision energy in the case of a frontal collision and an offset collision with the collision target P, and the damage to the collision target P is effectively prevented. Can be reduced.

  In the vehicle body front structure 10 of the present embodiment, the lowermost bumper side shock absorbing beam member 13 and frame side shock absorbing beam member 14 are arranged below the chassis frame 2. Therefore, the bumper side shock absorbing beam member 13 or the frame side shock absorbing beam member 14 at the lowermost end reliably prevents a passenger car or the like from entering, and the front underrun protector that is essential in the conventional cabover type vehicle is omitted. It becomes possible.

  Further, in the vehicle body front structure 10 of the present embodiment, the three bumper side shock absorbing beam members 13 and the frame side shock absorbing beam member 14 are arranged at intervals in the vertical direction of the vehicle body. Therefore, it becomes possible to take in the traveling wind flowing from the vent hole 11C of the front bumper member 11 without hindering the fan shroud or the like, and the engine cooling performance can be effectively maintained.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, if the strength of the front bumper member 11 is secured, the bumper fixing member 12 and the bumper side impact absorbing beam member 13 can be omitted as shown in FIG. In this case, both ends of the frame side shock absorbing beam member 14 may be directly fixed to the rear side surface of the front bumper member 11. The vehicle body front structure 10 is not limited to a cab-over type vehicle such as a truck, and can be widely applied to other vehicles such as a bus and a passenger car.

2 Chassis frame 3 Front end cross member 4 Bracket 10 Car body front structure 11 Front bumper member 12 Bumper fixing member 13 Bumper side shock absorbing beam member 14 Frame side shock absorbing beam member 15 Holding member 15A Guide hole 16 Friction member

Claims (6)

A front bumper member extending in the vehicle body width direction;
An elastic member that is formed in an arc shape projecting to the rear side of the vehicle body and that has both ends fixed to the rear side surface of the front bumper member;
A holding member that is provided on the lower frame of the vehicle and holds the elastic member so as to be slidable in the arc direction;
The elastic member is deformed in accordance with a frontal collision with the collision target body and moves the front bumper member to the rear of the vehicle body, and the elastic member is slid in an arc direction in accordance with an offset collision with the collision target body. A vehicle body front structure characterized by rotating a front bumper member. The vehicle body front part structure according to claim 1, wherein the holding member has a guide hole that allows the elastic member to pass therethrough and guides the elastic member so as to be movable in an arc direction. The vehicle body front part structure according to claim 2, wherein a friction member that applies a friction force to the elastic member is provided on an inner peripheral surface of the guide hole. The vehicle body front part structure according to any one of claims 1 to 3, wherein a plurality of the elastic members are provided, and at least some of the elastic members are disposed below the vehicle body lower frame. The vehicle body front part structure according to any one of claims 1 to 4, wherein the plurality of elastic members are arranged at intervals in a vertical direction of the vehicle body. The vehicle body front part structure according to any one of claims 1 to 5, wherein the elastic member is formed of a leaf spring.

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