JPS6323944B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a shock-absorbing bumper structure that is attached to a vehicle body such as an automobile, and particularly relates to a shock-absorbing bumper structure that can increase the reaction force generated during an impact. .

[Conventional technology]

As shown in FIGS. 1 to 3, the conventional impact-absorbing bumper structure includes a vehicle body bumper support member A (not shown).
A band-shaped elastic skin material 1 made of urethane is fixed by a plurality of bolts B, and a shock absorbing material made of urethane foam is attached to the skin material 1 and whose back surface is supported in contact with the bumper support material A. (For example, see Japanese Utility Model Application No. 53-26044).

Such a conventional shock absorbing bumper structure has a third
It absorbs impact energy from the front of the vehicle body as indicated by arrow P in the figure, and exhibits energy absorption characteristics as indicated by curve R in FIG. 6. That is, the horizontal axis indicates the displacement position of the skin material 1 and the shock absorbing material 2 when they are compressed toward the vehicle body during a collision, and the vertical axis represents the displacement position of the skin material 1 due to compression during the collision.
and the reaction force generated in the shock absorbing material 2.

[Problem that the invention seeks to solve]

However, in the case of such a conventional impact-absorbing bumper structure, since the impact-absorbing material 2 is made of a single uniform material, the rise of reaction force is low at the time of initial displacement due to impact, resulting in poor energy absorption efficiency. ,
In order to absorb a relatively large amount of energy, the amount of displacement must be increased, resulting in a problem that the bumper becomes large.

[Means for solving problems]

The present invention has been made by focusing on these conventional problems, and provides a shock absorbing bumper structure that can generate a large reaction force when a displacement is relatively small and can efficiently absorb high energy. The purpose is to provide

The impact-absorbing bumper structure of the present invention includes an elastic skin material and a shock-absorbing material attached to the inside of the skin material. A rigid plate extending from above is embedded and bonded, and an inclined portion extending in a direction inclined with respect to the plate is formed at an end of the plate.

[Effect]

Since the present invention is configured as described above,
When an impact load is applied, the shock absorbing material stretches in the extending direction of the rigid plate, causing separation between the impact absorbing material and the plate, and the front projected area of the rigid plate becomes wider than normal, receiving the load over a wide range. Absorbs high energy overall.

Therefore, the energy absorption efficiency is higher than that of the prior art having only a shock absorber.

〔Example〕

The present invention will be explained below with reference to embodiments shown in FIGS. 4 to 8. It should be noted that the same members and parts as in the prior art will be described using the same reference numerals.

4 and 5 show a first embodiment of the present invention, which has a conventional structure comprising an elastic skin material 1 and a shock absorbing material 2 therein, and according to the present invention:
For example, a plurality of rigid plates 3 extending in a direction intersecting the direction of the impact load P are embedded and bonded in the impact absorbing material 2. Further, in this embodiment, inclined portions 3a extending in a direction intersecting the extending direction of the plate material 3 are bent at both upper and lower ends of the plate material 3.

In the above shock absorbing bumper structure, when an impact load P is applied, the impact absorbing material 2 extends in the extending direction of the plate 3, and as shown in FIG. 5, separation occurs between the board 3 and the impact absorbing material 2. and absorbs high energy during this peeling. Therefore, the energy absorption efficiency is higher than when only the impact absorbing material 2 is provided.
Note that after peeling off, the shock absorbing material 2 is compressed and deformed in substantially the same manner as in the conventional case.

Furthermore, since the inclined portion 3a is formed on the plate material 3, the plate material 3 and the shock absorbing material 2 are difficult to separate from each other, and a characteristic that the initial reaction force is increased can be obtained. By varying the angle of this inclined portion 3a, the magnitude of the reaction force can be adjusted, making it easy to cope with various loads.

Furthermore, since the structure of the present invention includes the plate material 3, compared to the case where the shock absorbing material 2 is homogeneous,
Even if the reaction force is the same, the displacement will necessarily be smaller, and the displacement will also be smaller when the same energy is absorbed.

FIG. 7 shows the hysteresis of the energy absorption characteristics when the plate material 3 and the shock absorbing material 2 are separated from each other. Compared to the conventional curve R, the curve S according to the present invention has a larger hysteresis by the amount of peeling, and has the effect of lowering the repulsion speed against the impactor.

FIG. 8 shows a second embodiment, in which a plurality of rigid plates 3 are embedded and bonded in two stages, upper and lower, in a shock absorbing material 2, and the other structure is the same as that in FIG. 5.

〔Effect of the invention〕

As explained above, according to the present invention, a rigid plate extending in a direction intersecting the impact load direction is embedded and bonded in a shock absorbing material, and a rigid plate extending in a direction that is inclined with respect to the plate is attached at the end of the plate. Since the sloped portion extending from the top to the right is formed, it is possible to obtain a shock-absorbing bumper structure in which the rise of the generated reaction force is high, and the separation of the rigid plate material and the shock-absorbing material can increase energy absorption. By reducing the front projected area of the rigid plate, the rigid plate does not obstruct the flow of the material when forming the impact absorbing material, and in the event of a collision, the front projected area of the rigid plate is reduced as shown in Figure 5. The area is wider than normal and can receive loads over a wide range.

Further, according to the present invention, since the energy absorption efficiency is high, it is possible to reduce the dimensions of the skin material and the shock absorbing material in the compression direction, which has the advantage of increasing the degree of freedom in shaping the material for attachment to the vehicle body. Furthermore, since the rigid plate material is used, it is possible to reduce the amount of shock absorbing material made of a relatively expensive and unstable material such as urethane foam, thereby making it possible to reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating the entire conventional shock absorbing bumper structure, Fig. 2 is a cutaway perspective view taken along the line in Fig. 1, Fig. 3 is a cross-sectional view taken along the line - - in Fig. 2, and Fig. 4 is the invention of the present invention. FIG. 5 is a side view showing the same portion as FIG. 3 of the shock absorbing bumper structure according to the first embodiment, FIG. 5 is a sectional view explaining the operation of the structure in FIG. 4, and FIGS. 6 and 7 are
FIG. 4 is an energy absorption characteristic diagram of the structure, and FIG. 8 is a sectional view of the main part of the second embodiment. DESCRIPTION OF SYMBOLS 1... Elastic skin material, 2... Shock absorbing material, 3... Rigid board material, 3a... Inclined part.

Claims (1)

[Claims] 1. In a shock absorbing bumper structure comprising an elastic skin material and a shock absorbing material attached to the inside of this skin material, a rigid plate extending in a direction intersecting the direction of the impact load is embedded in the shock absorbing material. , an impact-absorbing bumper structure characterized in that the plate material is bonded, and an inclined portion extending in a direction inclined with respect to the plate material is formed at an end portion of the plate material.