JPH11348692A - Bumper structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an energy absorbing function in case of a collision during low-speed travel by arranging a plurality of column type high-rigidity energy absorbers parallelly to the vehicle traveling direction over the whole surface of a low-rigidity energy absorber and fitting the rear parts of the high-rigidity energy absorbers to bore/slit parts in a bumper reinforce. SOLUTION: In front of an automobile chassis side member 10 on the inside of a bumper fascia 11, a bumper reinforce 12 is arranged. A high-rigidity energy absorber 14 with a claw part 15 is arranged in a bore part 16 of the vehicle front side in the bumper reinforce 12 and combined with a bore part in a low- rigidity energy absorber 13. In this structure, the claw part 15 in the high-rigidity energy absorber 14 is broken in case of a collision, and the high-rigidity energy absorber 14 penetrates the bore part 16 in the bumper reinforce 12. In this way, reaction force by the high-rigidity energy absorber 14 is quickly reduced, and consequently, energy can be absorbed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle bumper structure, and more particularly to a vehicle bumper structure having an efficient energy absorbing function when a vehicle running at a low speed collides with an obstacle.

[0002]

2. Description of the Related Art As a conventional automobile bumper structure, for example, there is one having a structure as shown in FIG. This prior art has a structure in which a high-stiffness energy absorbing material 4 and a low-stiffness energy absorbing material 3 are arranged on the front side of a bumper reinforce 2 inside a bumper fascia 1 and absorbs energy during a light collision. ing. (As a similar technology,
No. 112143 and Japanese Utility Model Laid-Open No. 4-113254)

[0003]

However, in such a conventional bumper structure for an automobile, the high-rigidity energy absorbing material is fixed to the bumper reinforce even in the latter half of the collision. Although the reaction force in the early stage of the collision can be increased, the peak reaction force due to the low-stiffness energy absorbing material in the latter half of the collision has also been increased. Therefore, in order to obtain sufficient energy absorption performance, it is necessary to increase the thickness of the energy absorbing material, which increases the weight and the length of the front and rear bumpers, impairing the vehicle design,
There is a problem that the minimum turning radius is increased.

The present invention has been made in view of such a conventional problem. After increasing the reaction force at the initial stage of the collision with a high-rigidity energy absorbing material, the claw portion or the thin plate of the high-rigidity energy absorbing material is used. The high-stiffness energy-absorbing material penetrates through the hole or slit of the reinforce due to the fracture or bending of the rifle, and the initial reaction force is rapidly reduced without increasing the peak reaction force in the latter half of the collision, resulting in a deceleration waveform. An object of the present invention is to solve the above-mentioned problem by approaching a rectangular wave.

In addition, the high-rigidity energy absorbing material and the claw portion are integrally formed so that the entire high-rigidity energy absorbing material penetrates the reinforce when the claw portion is broken, so that an initial reaction force is generated by the mass effect of the resin material. Can also be increased.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a bumper fascia which is located at a front part of an automobile and serves as a bumper structure. In a bumper structure having an energy absorbing material having a dual structure different in rigidity from a bumper reinforce, a plurality of energy absorbing materials are provided inside or on the entire upper surface or lower surface of the low-rigidity energy absorbing material in a parallel and parallel or staggered manner in the vehicle traveling direction. A high rigidity energy absorbing material having a columnar shape, a rear portion of the high rigidity energy absorbing material fits into a hole or a slit of the bumper reinforce, and a claw portion of the high rigidity energy absorbing material serves as a stopper. It is characterized by the following.

According to a second aspect of the present invention, in the automobile bumper structure according to the first aspect, each of the plurality of pillar-shaped high-rigidity energy absorbing members is integrally formed in a thin plate shape. It is characterized by the following.

According to a third aspect of the present invention, in the vehicle bumper structure according to the first or second aspect, the high rigidity energy absorbing member covers the front surface of the vehicle with the low rigidity energy absorbing material. The vehicle is characterized in that the vehicle front side of the absorbent has a flat plate-shaped portion.

According to a fourth aspect of the present invention, in the vehicle bumper structure according to the first to third aspects, the high-rigidity energy absorbing material has an integral shape. is there.

According to a fifth aspect of the present invention, in the bumper structure for an automobile according to the first to fourth aspects, a projection is provided around the bumper reinforce hole.

[0011] Further, a sixth invention according to a sixth aspect is characterized in that:
In the bumper structure which is located at the front part of the automobile and has the energy absorbing material having a dual structure different in rigidity from the bumper fascia and the bumper reinforce which become the bumper structure, the inside or the upper surface of the low rigidity energy absorbing material or A plurality of pillar-shaped high-stiffness energy absorbing materials are disposed on the entire lower surface in parallel and in parallel or in a staggered manner in the vehicle traveling direction, and a thin plate is joined to a hole or a slit of the bumper reinforce. It is assumed that.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a vehicle bumper structure according to the present invention. (First Embodiment) FIGS. 1 and 2 show a first embodiment of a vehicle bumper structure according to the present invention.

First, the structure will be described. The vehicle bumper structure according to the first embodiment is, as shown in FIGS. 1 and 2, a front portion of a side member 10 of a vehicle chassis inside a bumper fascia 11. The bumper reinforce 12 is disposed on the vehicle, the high rigidity energy absorbing member 14 having the claw 15 is disposed in the hole 16 on the vehicle front side of the bumper reinforce 12, and the hole of the low rigidity energy absorbing member 13 is provided. Combined.

Next, the operation of the first embodiment will be described. It is generally known that increasing the deceleration at the beginning of the collision to make the deceleration waveform closer to a rectangle and reducing the peak deceleration (see FIG. 3). The deceleration in the initial stage of collision with an object is increased by the combined force of the high-rigidity energy absorbing material 14 and the low-rigidity energy absorbing material 13. Among these, the deceleration waveform by the high-rigidity energy absorbing material 14 After the peak is generated, deceleration occurs until the deformation ends, while gradually decreasing, and this also affects the maximum peak G (see FIG. 4).

In the first embodiment, the reaction force of the high-rigidity energy absorbing material 14 is obtained by breaking the claw 15 of the high-rigidity energy absorbing material 14 and piercing the hole 16 of the bumper reinforce 12. , The energy can be efficiently absorbed (see FIG. 5).

The claw portion 1 of the high-rigidity energy absorbing material 14
Since the allowable shear force of 5 depends on the plate thickness and the length of the contour of the claw portion 15, there is also an effect that the peak value of the initial reaction force can be easily set.

(Second Embodiment) FIG. 6 is a view showing a second embodiment of a vehicle bumper structure according to the present invention. In the second embodiment, the claw portion of the high-rigidity energy absorbing material 14 is integrated with the first embodiment. The claw portion 25 effectively increases the high rigidity energy absorbing material 14.
A vertical load is generated on the claw portion 25, a frictional force is secured, the movement of the claw portion 25 is suppressed, stress is concentrated on the corner portion of the claw, and the structure is easily broken. In addition, there is an effect that workability at the time of assembly is improved by being integrated.

(Third Embodiment) FIG. 7 is a view showing a third embodiment of a vehicle bumper structure according to the present invention. The third embodiment is different from the first embodiment in that the hole of the bumper reinforce 12 and the claw of the high-rigidity energy absorbing material 14 are enlarged, and the hole 3 is deformed by the claw 35.
6.

In the third embodiment, in addition to the ability of the first embodiment to set the peak value of the initial reaction force, the pawl 3
By adjusting the size of the hole 5 and the hole 36, it is possible to control the stroke at which the initial load decreases, as shown in FIG.

(Fourth Embodiment) FIG. 9 is a view showing a fourth embodiment of a vehicle bumper structure according to the present invention. The fourth embodiment is different from the first embodiment in that a flat plate 47 is added in front of the high-rigidity energy absorbing member 14 so as to cover the front portion of the low-rigidity energy absorbing member 13. .

As shown in FIG. 10, the initial deceleration is increased by increasing the effective area for absorbing energy at the time of collision by the flat plate 47, and furthermore, when an object collides between the high-rigidity energy absorbing members 14. Also high rigidity energy absorbing material 14
The load can be effectively transmitted to the claw portion 15 of the first embodiment.

(Fifth Embodiment) FIG. 11 is a view showing a fifth embodiment of a vehicle bumper structure according to the present invention. The fifth embodiment is different from the first embodiment in that
It has a structure in which a high-rigidity energy absorbing material and a claw portion are integrated in a flat plate shape. This is because the entire high-rigidity energy absorbing material 54 penetrates the bumper reinforce 12 when the claw portion 55 is broken, so that the initial reaction force can be increased by the mass effect of the resin material.

(Sixth Embodiment) FIG. 12 is a view showing a sixth embodiment of a vehicle bumper structure according to the present invention. The sixth embodiment is different from the first embodiment in that
The claw portion of the high-rigidity energy absorbing material 14 is eliminated and replaced with a thin plate material 68. Micro hole 69 in thin plate material 68
Can be provided to facilitate the breakage.

(Seventh Embodiment) FIG. 13 is a view showing a vehicle bumper structure according to a seventh embodiment of the present invention. The seventh embodiment has a structure (symbol 78 in the drawing) obtained by dividing the thin plate member 68 of the sixth embodiment into two parts, and the high-rigidity energy absorbing material 14 can also penetrate the bumper reinforce 12 by bending. it can.

(Eighth Embodiment) FIGS. 14 and 15 are views showing an eighth embodiment of a vehicle bumper structure according to the present invention. The eighth embodiment is different from the first embodiment in that a projection 89 is formed in the hole 16 of the bumper reinforce 12.
The structure has. The projections 89 can reliably break the claw portions 15 of the high-rigidity energy absorbing material 14.

[0026]

Since the present invention has the above-mentioned features, it has an efficient energy absorbing function when a vehicle running at a low speed collides with an obstacle, so that the front-rear length of the bumper can be shortened. The effect is that the degree of freedom in vehicle design can be increased.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a first embodiment of a vehicle bumper structure according to the present invention.

FIG. 2 is an exploded perspective view showing the configuration of the first embodiment.

FIG. 3 is a basic operation diagram.

FIG. 4 is an operation diagram of the related art.

FIG. 5 is an operation diagram of the first embodiment.

FIG. 6 is an exploded perspective view showing the configuration of the second embodiment.

FIG. 7 is an operation diagram of the third embodiment.

FIG. 8 is an operation diagram of the third embodiment.

FIG. 9 is a perspective view showing a configuration of a fourth embodiment.

FIG. 10 is an operation diagram of the fourth embodiment.

FIG. 11 is a perspective view illustrating a configuration of a fifth embodiment.

FIG. 12 is a side view showing the configuration of the sixth embodiment.

FIG. 13 is a side view showing the configuration of the seventh embodiment.

FIG. 14 is an exploded perspective view showing the configuration of the eighth embodiment.

FIG. 15 is an operation diagram of the eighth embodiment.

FIG. 16 is a side view showing the configuration of a conventional vehicle bumper structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Side member 11 Bumper fascia 12 Bumper reinforce 13 Low rigidity energy absorbing material 14, 54 High rigidity energy absorbing material 15, 25, 35, 55 Claw part of high rigidity energy absorbing material 16, 36 Bumper reinforcement hole 47 Flat plate of high rigidity energy absorbing material 68,78 Thin plate material 69 Micro hole of thin plate material 89 Projection of bumper reinforcement hole

Claims (6)

[Claims] 1. A bumper structure which is located at a front part of an automobile and has a double structure having a rigidity different from that of a bumper fascia and a bumper reinforce serving as a bumper structure, wherein the energy absorbing material has a low rigidity. A plurality of pillar-shaped high-stiffness energy absorbing materials are disposed in parallel or in parallel or in a staggered manner in the vehicle traveling direction on the inside or on the entire upper surface or lower surface, and a rear portion of the high-stiffness energy absorbing material has a hole in the bumper reinforcement. A bumper structure for an automobile, wherein a claw portion of the high-rigidity energy absorbing material serves as a stopper when fitted to a portion or a slit portion. 2. The vehicle bumper structure according to claim 1, wherein each of the plurality of pillar-shaped high-rigidity energy absorbing members is integrally formed in a thin plate shape. 3. The vehicle bumper structure according to claim 1, wherein the low-rigidity energy absorbing material covers a front surface of the vehicle.
A bumper structure for an automobile, wherein a front side of the high-rigidity energy absorbing material has a flat portion. 4. The bumper structure for an automobile according to claim 1, wherein said high-rigidity energy absorbing material has an integral shape. 5. The bumper structure for an automobile according to claim 1, further comprising a projection around the bumper reinforce hole. 6. A bumper structure which is located at a front part of an automobile and has a double-structured energy absorbing material having a different rigidity from a bumper fascia and a bumper reinforce, which is a bumper structure, wherein a low-rigidity energy absorbing material is provided. A plurality of pillar-shaped high-stiffness energy absorbing materials are arranged in parallel or in parallel or in a staggered manner in the vehicle traveling direction on the inside or on the entire upper surface or lower surface, and a thin plate is joined to the hole or slit of the bumper reinforce. A bumper structure for an automobile, characterized in that: