JPH04112143U - vehicle bumper device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the weight of the bumper device and improve energy absorption efficiency. [Structure] A bumper device 1 includes a cylindrical bumper beam 2 formed by extrusion molding an aluminum alloy, and energy absorbing members 3 in each of the spaces 6 to 8 within the bumper beam 2. The urethane foam 3A as the energy absorbing member 3 increases the load required to deform the bumper beam 2, and increases the energy of the load that can be absorbed by deforming the bumper beam 2. Therefore, the so-called energy absorption efficiency of the bumper beam 2, whose cross-sectional shape is difficult to partially change, can be set appropriately.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a bumper device for a vehicle.

0002

[Prior art and its problems]

A vehicle bumper device is attached to the vehicle frame via a shock absorber. It consists of a bumper beam, a bumper face covering the bumper beam, etc. Ru. The bumper beam, which is a cylindrical strength member, is made of extruded aluminum alloy. It is designed to be lightweight.

0003 By the way, bumper beams that are extruded have their cross-sectional shape partially changed. It's difficult. Therefore, even when improving the strength of a desired part of the bumper beam, The damper beam becomes thick over its entire length, which goes against the request for weight reduction. others Therefore, there is a need to improve the strength of bumper devices and improve the so-called energy absorption efficiency. The problem is that it is not possible to satisfy both the demand for a lightweight bumper device and the demand for a lighter bumper device. there were.

0004 This invention was made to solve the above-mentioned problems, and aims to reduce weight while To provide a bumper device for a vehicle that can improve energy absorption efficiency. With the goal.

[0005]

[Means to solve the problem]

In order to achieve the above object, the present invention provides a cylindrical bumper beam and a cylindrical bumper beam. and an energy absorbing member disposed within the beam.

[0006]

[Effect]

Energy absorbing members increase the load required to deform the bumper beam. , the bumper beam deforms to increase the load energy that can be absorbed. follow Therefore, the so-called energy absorption efficiency can be partially set appropriately.

[0007]

【Example】

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings. 1 and 2 show an embodiment of a bumper device for a vehicle to which the present invention is applied. The bumper device 1 includes a bumper beam 2, an energy absorbing member 3, and a pair of shock absorbers. 5. It is composed of a bumper face (not shown) and the like.

[0008] The bumper beam 2 is arranged at the front end of the vehicle body 10 and extends in the vehicle width direction. Ru. Both ends of the bumper beam 2 are located near both side surfaces of the body 10. . This bumper beam 2 has a substantially rectangular cylindrical shape, and inside the bumper beam 2 there are partition walls 2a, 2a. are integrally molded (Figure 2). Each partition wall 2a, 2a has the entire length of the bumper beam 2. The inner space of the bumper beam 2 is divided into an upper space 6 and a middle space. 7. The lower space is partitioned into 8.

[0009] This bumper beam 2 is formed by extruding an aluminum alloy, for example. has been done. Therefore, the thickness of the bumper beam 2 is formed to be approximately constant over the entire length. ing. In addition, on the rear surface of the bumper beam 2, there are brackets located near both left and right ends. The nuts 13, 13 are screwed and fixed. Each bracket 13 has a front It is arranged opposite to the side members 11, 11.

0010 A pair of shock absorbers 5 connect the bumper beam 2 to each front side member 1. It is attached to 1. Each front side member 11 is a cylindrical strength member. The base end of each shock absorber 5 is inserted into each of these front side members 11. and is fixed via a bracket 14. In addition, each shock absorber 5 The tip protrudes from the tip of each front side member 11 and is connected to each of the brackets described above. 13, respectively.

[0011] The energy absorbing member 3 is made of urethane foam 3A, for example, and is used for each of the bumper beams 2. They are arranged in the spaces 6 to 8, respectively. To explain in detail, the energy absorbing member 3 The urethane foam 3A is placed around each bracket 13 in each space 6 to 8. (shaded areas indicated by A in FIG. 1), respectively. Each energy absorption part The material 3 partially reinforces the bumper beam 2.

0012 Note that it is not necessarily necessary to arrange the energy absorbing member 3 in all spaces 6 to 8. , an energy absorbing section is provided only in one or two of these spaces 6 to 8. It is also possible to adopt a configuration in which the material 3 is provided. FIG. 3 shows the load deformation characteristics of this bumper device 1, and shows the load applied to the bumper device 1. When the force is applied, the bumper beam 2 first deforms (section A in the figure). Bumper beam 2 is It deforms as shown by the solid line in the figure due to the input load. On the other hand, bumper beam If no energy absorbing member is installed in the bumper beam, this bumper beam will absorb the input load. As a result, it is deformed as shown by the two-dot chain line in the figure. Therefore, energy is applied to bumper beam 2. When the absorbing member 3 is installed, the load required to deform the bumper beam 2 increases. do.

[0013] In other words, the energy of the load that can be absorbed by deforming the bumper beam 2 increases, and the energy corresponding to the range D surrounded by the solid line and the two-dot chain line in Fig. 3 is The bumper beam 2 on which the energy absorption member 3 is arranged can absorb energy. Then, the bumper device 1 compresses each shock absorber 5 to absorb the energy of the load. After absorbing the load (section B in the figure), each front side member 11 is deformed to absorb the load. Absorbs energy (section C in the figure).

[0014] Note that the energy absorbing member 3 is not limited to the urethane foam 3A. Any member that can absorb the energy of the load by deforming may be used. For example, fig. 4, a steel plate 3B formed into a substantially rectangular cylindrical shape may be used; in this case, the steel plate 3B 3B is preferably fixed to the bumper beam 2 with an adhesive. Also, for example, It may also be a member made of aluminum or the like formed into a so-called honeycomb structure. In other words, the place The material of the energy absorbing member 3 may be appropriately selected depending on the desired energy absorption efficiency. .

[0015] Furthermore, in this embodiment, urethane foam 3 is used as the energy absorbing member 3. A is placed in each space 6 to 8, but it is not limited to this, and it is different for each space 6 to 8. The energy absorbing member 3 made of the following members may be combined and arranged. for example , as shown in FIG. The energy absorbing member 3 made of urethane foam 3A is placed in the hollow space 7. From the member 3C made of aluminum etc. formed into a so-called honeycomb-like structure in the lower space 8. Alternatively, energy absorbing members 3 may be provided. That is, the desired energy absorption The energy absorbing members 3 may be combined as appropriate depending on the efficiency of energy absorption.

[0016] In addition, in this embodiment, the energy absorbing member 3 is located at the diagonally shaded area indicated by A in FIG. However, it is not limited to this location. That is, the desired energy absorption efficiency The installation position can be set appropriately depending on the energy absorbing member 3. The bumper beam 2 may be provided at a predetermined portion of the bumper beam 2, or may be provided over approximately the entire length of the bumper beam 2. stomach. This allows the so-called energy absorption efficiency of the bumper beam 2 to be partially set appropriately. can be done.

[0017]

[Effect of the idea]

As explained above, according to the present invention, the vehicle bumper device is configured as described above. Therefore, we aim to reduce the weight of the bumper device and improve energy absorption efficiency. It has excellent effects such as:

[Brief explanation of drawings]

FIG. 1 is a plan view showing a schematic configuration of an embodiment of a bumper device for a vehicle to which the present invention is applied.

FIG. 2 is a sectional view of the bumper device along arrow II-II in FIG. 1;

FIG. 3 is a load displacement characteristic diagram of the bumper device in FIG. 1;

FIG. 4 is a sectional view showing another embodiment of the energy absorbing member of FIG. 1;

5 is a sectional view showing still another embodiment of the energy absorbing member shown in FIG. 1. FIG.

[Explanation of symbols]

1 Bumper device 2 Bumper beam 3 Energy absorption member 3A Urethane foam 3B Steel plate 3C Honeycomb-shaped member

Claims (1)

[Scope of utility model registration request] 1. A bumper device for a vehicle, comprising a cylindrical bumper beam and an energy absorbing member disposed within the bumper beam.