KR20090118585A - Energy absorber for a car - Google Patents

Abstract

PURPOSE: An energy absorber for a vehicle is provided to prevent a block from falling down by bent portions having various shapes and to improve generated load by reinforcing the unit blocks. CONSTITUTION: An energy absorber(10) for a vehicle is embedded inside a bumper cover to absorb energy in a rear-end collision. The energy absorber for the vehicle comprises a unit block(20) of plastic material. The unit block is protruded from the front of the energy absorber at constant intervals. The unit blocks are arranged in different shapes regularly and irregularly. The projected height of the unit block is shaped to have different height differences.

Description

Energy absorber for car {Energy absorber for a car}

The present invention relates to an energy absorber for automobiles, and more particularly, by irregularly arranging a plurality of block bodies having different shapes, it is possible to increase the generated load and to prevent the protrusions from collapsing when the vehicle collides, thereby ensuring the stability and productability of the product. It is invented to improve.

In general, the front bumper portion of the vehicle, as shown in Fig. 1, in order to mitigate the impact of the vehicle crash and to protect the pedestrian, the energy absorber 10 is attached to the front of the back beam 1 inside the front bumper cover. .

The back beam 1 is fixed in front of the vehicle body.

Therefore, when the front of the vehicle collides, the energy absorber 10 built in the bumper cover absorbs the impact amount and functions to protect the pedestrian by lowering the speed of the vehicle.

The energy absorber 10 is usually made of a resin material, polypropylene is a typical raw material.

As a fabrication method, a steam chest method is employed to inject a resin raw material into a mold that is modeled after the energy absorber 10, and then heat is applied to expand and expand the raw material.

2 is a perspective view of the shape of a representative known energy absorber 10.

The conventional energy absorber 10 is formed using a uniform resin raw material while protruding a plurality of unit block bodies 20 toward the bumper cover.

However, the structure in which the conventional block-shaped unit block body 20 is protruded from each other at a distance has a weakness in impact because the entire thickness of the product has to be made slim in the molding process.

In addition, in order to increase the rigidity of the block body 20 to form a wavy bead on the outer periphery of the unit block body 20, in order to be deformed outwards, the wall of the block body 20 is made to be bent outwardly Efforts have been made to prevent local deformation.

However, when the impact test results using the energy absorber 10 of the prior art are examined based on the standards of the pedestrian collision protection law, when the front bumper of the vehicle collides with the lower part of the leg form, the block body (located at the collision site) 20) is a problem that does not satisfy the law because the proper control of the deceleration is not achieved as a result of large damage or collapse in the impact direction.

The present invention is to provide an energy absorber that is improved to protect the pedestrian with a stable shock absorption by irregularly arranging the unit block bodies in different shapes by improving such a conventional problem.

Another object of the present invention is to provide an energy absorber capable of increasing the generated load and preventing the block body from falling in the impact direction.

The present invention is embedded in the bumper cover to absorb the energy when colliding, and in the unit block body 20 is protruded integrally at a distance in front of the synthetic resin material,

The unit block bodies 20 are achieved by irregularly arranging a plurality of block bodies of different shapes.

Here, when the unit block 20 is formed to have a height difference T different from the protruding height, the unit block 20 may further improve the stiffness.

In addition, when the step 23 is formed at the end of the unit block 20, the rigidity may be improved at the end of the unit block 20.

On the other hand, it is noted that the unit block 20 may be molded integrally with the bumper cover 30.

As described above, by forming the protruding wall of the brick-shaped block bodies 20 connected to each other in the longitudinal direction in the form of curved portions, a longer protruding wall can be configured.

Accordingly, the generated load may be increased by reinforcing the rigidity of the unit block bodies 20, and the block bodies 20 may be prevented from falling when colliding by the curved portions having various shapes.

Therefore, it is possible to protect the pedestrians with stable shock absorption, and satisfy the criteria of the pedestrian collision protection law.

Hereinafter, with reference to Figures 3 to 7 showing a preferred embodiment of the present invention in more detail.

FIG. 1 shows a state in which the energy absorber 10 is attached to and fixed to the front of the back beam 1 with the energy absorber 10 located inside the bumper cover (not shown).

2 is a partial perspective view of a shape of a conventional energy absorber 10.

3 to 6 are views showing, in some perspective embodiments, the unit block bodies 20 protrudingly arranged in various shapes in the energy absorber 10 formed by the present invention.

7 is a cross-sectional view of FIG. 6.

8 is a cross-sectional view illustrating another embodiment of FIG. 7.

9 is a cross-sectional view showing another embodiment in which the unit block 20 of the present invention is integrally formed from the bumper cover 30 side.

The energy absorber 10 of the present invention is attached to and fixed to the back beam 1 so as to absorb energy during a collision (not shown) as shown in FIG. 1, such that a bumper cover (not shown) covers the outside of the energy absorber 10. do.

The energy absorber 10 is formed of a synthetic resin material, and as shown in FIG. 2, the unit block bodies 20 are integrally protruded at a distance from each other.

In the present invention, the unit block bodies 20 are protruded to a number of forward in a variety of block shapes, as shown in Figures 3 to 6, it is to form the shape or height of the unit block bodies 20 with different It is important.

That is, as shown in the embodiment of Fig. 3, the block body 20 at both ends is molded into a shape in which two rhombuses are connected at the same height, and the center portion is formed in a shape in which the chamfered shapes are repeatedly connected to the left and right sides of the rhombus.

In this case, forming the protrusion height of the unit block body 20 having a rhombus shape may improve the shock absorbing ability and increase the generated load.

In the embodiment of FIG. 4, the block bodies 20 having rectangular block shapes are arranged at the upper and lower ends of the energy absorber, which are elongated in the longitudinal direction, such as a bumper, and in the middle thereof, the uneven block bodies 20 having a “凸” shape are arranged in the middle. ) Will be placed protruding toward the front.

5 illustrates an embodiment in which the size and protrusion height of the rectangular unit block bodies 20 are formed differently from each other.

In this case, since the shock is sequentially absorbed at different heights when the vehicle collides, the shock absorbing ability may be further improved and the generated load may be further increased as compared with the case where the protruding height difference of the block body 20 is provided in two stages.

In the embodiment of Figure 6 is arranged a block body 20 of rectangular block shape at the top and bottom of the energy absorber is formed long in the longitudinal direction, such as a bumper, in the middle of the low-height block body of the "S" shape It is arranged to protrude 20 toward the front.

FIG. 7 is a cross-sectional view taken along the line A-A 'of FIG. 6, and the block bodies 20 may be molded to have different shapes, and the protrusion heights may be molded to have a height difference T.

Therefore, when the block bodies 20 are formed in different shapes to have their protruding heights having a height difference T, the block bodies 20 may further improve rigidity.

In general, the energy absorber 10 is displaced while absorbing impact force toward the back beam 1 when the vehicle collides, as shown by a virtual line in FIG. 1, and the upper and lower surfaces of the block body 20 are symmetrical in a shape in which the ship is convex. It must be displaced to expect a stable shock absorbing effect.

However, the conventional block bodies 20 do not induce stable absorption displacement as in the imaginary line of FIG. 1, but the block body 20 falls and falls in the collision direction.

On the contrary, when the unit block bodies 20 are formed to have a height difference T in different shapes as in the present invention, rigidity is reinforced so that the unit block bodies 20 do not fall down when the vehicle collides. As shown by the imaginary line of, stable shock absorption displacement can be induced.

Therefore, not only the pedestrian can be protected in the event of a collision, but also the damage of parts can be prevented by the energy absorber 10 returning again after the collision.

In addition, the block bodies 20 form different protrusion heights in different shapes to improve the stiffness even when impact force is applied in various directions and at various heights, as well as inducing displacement absorption more stably as shown in the virtual line of FIG. 1. You can do it.

In addition, when the step 23 is formed at the end of the unit block 20, as shown in FIG. 8, the rigidity of the introduction part at which the impact is first reached during the collision accident may be further improved by increasing the cross-sectional coefficient.

In addition, when the stiffness is reinforced by forming the step 23 at the end, even if the impact force is applied in various directions and at various heights, the stiffness is improved, as well as the displacement absorption can be induced more stably as shown in the virtual line of FIG. will be.

Meanwhile, the unit block 20 may be integrally molded from the bumper cover 30 toward the back beam 1 as shown in FIG. 9.

In this case, the back beam 1 may be formed by bending the unit block 20 in a 'c' shape to stably maintain the attachment state without falling down in the direction of the impact.

1 is a cross-sectional view showing a state in which an energy absorber is attached and fixed to the front of the back beam.

Figure 2 is a perspective view showing the shape of a conventional energy absorber.

3 to 6 are perspective views showing some embodiments according to the shape of the energy absorber molded by the present invention.

7 is a cross-sectional view taken along the line AA ′ of FIG. 6.

8 is a sectional view showing another embodiment of FIG.

Figure 9 is a cross-sectional view showing another embodiment in which the unit block of the present invention is integrally molded from the bumper cover side.

Explanation of symbols on the main parts of the drawings

1-Back Beam 10-Energy Absorber

20-Block T-Height difference

23-step

Claims (4)

In the bumper cover, the bumper cover is built to absorb energy when colliding, and the unit block bodies 20 are integrally protruded at a distance from the front of the synthetic resin material. The unit block bodies (20) are energy absorbers for automobiles, characterized in that the regular or irregular arrangement of a plurality of block bodies of different shapes. The energy absorber for automobile according to claim 1, wherein the unit block (20) is formed so as to have a height difference (T) different from each other. The energy absorber for automobile according to claim 1, wherein a step (23) is formed at an end of the unit block (20). The energy absorber for automobile according to claim 1, wherein the unit block (20) is integrally molded with the bumper cover (30).

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