JPH0547003Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vehicle impact absorption device that absorbs impact energy during a vehicle collision.

(Prior art) Hampers are attached to the front and rear of the vehicle body to protect the vehicle body and body accessories in the event of a collision with another vehicle or object, but as society's interest in automobile safety increases, There is a demand for this bumper to have a function of absorbing impact energy during a vehicle collision. In order to meet this demand, as exemplified in Japanese Utility Model Publication No. 57-51154, a shock absorbing device for a vehicle has been proposed in which a bumper beam extending in the longitudinal direction of the vehicle is attached to a vehicle body member via a honeycomb structure. There is. Further, Japanese Utility Model Application Publication No. 59-151756 discloses a technique for absorbing impact with a bumper stay.

(Problem to be solved by the invention) The honeycomb structure in the above vehicle shock absorption device absorbs energy by deforming itself during a collision. In other words, the honeycomb structure absorbs impact energy by buckling and deforming during a collision. It is something that absorbs.

In conventional vehicle impact absorption devices, there is no gap between the honeycomb structure and the honeycomb pressing portion that presses the honeycomb structure to buckle and deform it, so even if the vehicle has a minor collision, A load acts on the honeycomb structure.

For this reason, if the honeycomb structure is made of metal (such as aluminum), once it is deformed, it will not return to its original shape, so it must be replaced after a collision. First, conventional vehicle shock absorption devices have a problem in that they are not practically effective.

In particular, a honeycomb structure having a hollow portion extending in the longitudinal direction of the vehicle has appropriate rigidity against impact force from the front direction, and effectively absorbs impact force through its buckling deformation. It has a characteristic of having low rigidity and easily deforming against impact force from an oblique direction. Therefore, when a vehicle has a slight collision from an oblique direction, a diagonal impact force acts on the bumper beam and the honeycomb structure is easily deformed, resulting in the problem that the honeycomb structure must be replaced.

In view of the above, the present invention enables the honeycomb structure to not be damaged in the event of a light collision because the impact force is not transmitted to the honeycomb structure, and in the event of a normal collision, the honeycomb structure can effectively absorb the impact energy. The purpose of the present invention is to provide a shock absorbing device for a vehicle.

(Means for solving the problem) In order to achieve the above object, the present invention absorbs the impact force at the time of a light collision by the bumper stay and does not transmit it to the honeycomb structure. The impact force is absorbed by the honeycomb structure.

Specifically, the solution taken by the present invention is that the shock absorbing device of a vehicle is connected to a bumper beam extending in the width direction of the vehicle, one end of which holds the bumper beam, and the other end of which is held by a vehicle body member. A bumper stay that absorbs impact energy by curving at times, and a hollow portion provided in one of the bumper beam and the vehicle body member so as to be located between the bumper beam and the vehicle body member and extending in the longitudinal direction of the vehicle. a honeycomb structure that absorbs impact energy by buckling in the longitudinal direction of the vehicle during a collision; and a honeycomb structure provided on the other of the bumper beam and the vehicle body member so as to face the honeycomb structure with a gap therebetween. and a honeycomb pressing portion that presses the honeycomb structure in the longitudinal direction of the vehicle to buckle and deform the honeycomb structure when the bumper stay is bent during a collision.

(Function) With the above configuration, the bumper beam is held via the bumper stay that curves and absorbs impact energy during a collision, so if the vehicle has a light collision from the front or diagonally, the bumper beam will curve. Impact energy is absorbed by deformation. In this case, since there is a gap between the honeycomb structure and the honeycomb pressing part, the honeycomb structure does not press the honeycomb pressing part.

On the other hand, when the vehicle has a normal collision, the bumper stay is largely curved and the honeycomb pressing portion presses the honeycomb structure, causing the honeycomb structure to buckle and deform in the longitudinal direction of the vehicle.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Although the vehicle shock absorbing device according to the present invention can be applied to both the front and rear portions of the vehicle body, in each of the following embodiments, a case where the device is attached to the front portion of the vehicle body will be described.

1 and 2 show a shock absorbing device for a vehicle according to a first embodiment of the present invention, in which reference numeral 1 denotes a front frame as a vehicle body member disposed on the left and right sides of the front part of the vehicle body, and a cross member 2 A bumper beam 3 made of a molded steel plate and extending in the vehicle width direction is disposed in front of the front frame 1.

The bumper beam 3 is pivoted on the left and right sides of its rear surface by the front ends of two band-like bumper stays 3 that are slightly curved outward, and the rear ends of these bumper stays 4 are attached to bolts 41. It is attached to both sides of the front frame 1 via. Thereby, when the vehicle has a light collision from the front or an oblique direction, the bumper stay 4 can curve outward and absorb the impact energy.

A honeycomb structure 5 having a hollow portion extending in the longitudinal direction of the vehicle is disposed between the bumper beam 3 and the front frame 1. Front and rear reinforcing plates 51 and 52 are attached to connect the partition walls. While the honeycomb structure 5 is supported by the front frame 1 via the rear reinforcing plate 52,
A gap 7 is formed between the front reinforcing plate 51 of the honeycomb structure 5 and the honeycomb pressing portion 6, which is the rear surface of the bumper beam 3, to allow the bumper beam 3 to retreat in the event of a light collision.

By doing so, even if the bumper stay 4 is slightly bent and the bumper beam 3 is slightly retreated during a light collision, the honeycomb pressing part 6 and the honeycomb structure 5 do not collide, so the honeycomb structure 5 is not damaged. In addition, in a normal collision, the bumper stay 4 is greatly curved, and the bumper beam 3, that is, the honeycomb pressing part 6, is greatly retreated and collides with the honeycomb structure 5, so the honeycomb structure 5 deforms and absorbs impact energy. Absorb.

In these cases, since the bumper stay 4 is curved outward in advance, the bumper stay 4 does not curve inward during a collision and collide with the side of the honeycomb structure 5, causing damage.

FIG. 3 shows a cross-sectional structure of a shock absorbing device for a vehicle according to a second embodiment of the present invention.

In this embodiment, the honeycomb structure 5 is housed inside a rectangular cylindrical front frame 1, and is further hinged to a connecting rod 8 hinged to the rear surface of the bumper beam 3 via a front reinforcing plate 51. combined. By doing this, the vehicle collides diagonally and the bumper beam 3
Even if it retreats diagonally, the honeycomb structure 5 is guided by the inner peripheral surface of the front frame 1 and can retreat straight.

A plate-shaped honeycomb pressing part 6 is attached to the rear of the honeycomb structure 5 inside the front frame 1 through a gap 7. It collides with the pressing part 6 and absorbs impact energy while being deformed.

In this embodiment, the honeycomb structure 5 is housed inside the front frame 1, and the bumper stay 4 may curve inward during a collision, so the shape of the bumper stay 4 is linear. Good too.

Furthermore, since a gap 7 is formed between the honeycomb structure 5 and the honeycomb pressing part 6, the honeycomb structure 5 will not be damaged even if the bumper beam 3 is slightly curved in a light collision, and the honeycomb structure 5 will not be damaged in a normal collision. At times, the bumper stay 4 is greatly curved, and the honeycomb structure 5
It is the same as the first embodiment in that it deforms and absorbs impact energy.

FIGS. 4 and 5 show a third embodiment of the vehicle shock absorbing device according to the present invention.

In this embodiment, the honeycomb structure 5 has its rear part housed inside the rectangular cylindrical front frame 1, and is supported by a support member 11 fixed inside the front frame 1 via a rear reinforcing plate 52. However, as in the first embodiment, a gap 7 is formed between the front reinforcing plate 51 of the honeycomb structure 5 and the honeycomb pressing portion 6 which is the rear surface of the bumper beam 3.

Rearward convex portions 31 at the top and bottom of the bumper beam 3
On the other hand, the front end of the front frame 1 is provided with a recess 12 having a shape corresponding to the projection 31. If the bumper stay 4 is greatly curved during a collision, these projections 31 and Recess 12
The impact force of the bumper beam 3 can be transmitted to the front frame 1 by fitting together.

Circular notches 13 are provided in the upper and lower portions of the front frame 1 behind the support member 11, and the front frame 1 bends through the notches 13 in the event of a collision, allowing impact energy to be absorbed.

Since the vehicle shock absorbing device of this embodiment is configured as described above, the honeycomb structure 5 will not be damaged even if the bumper beam 3 is slightly curved in a light collision, and the bumper stay will not be damaged in a normal collision. 3
The honeycomb structure 5 and the front frame 1 can work together to absorb impact energy.

FIG. 6 shows a shock absorbing device for a vehicle according to a fourth embodiment of the present invention.

In this embodiment, the honeycomb structure 5 is stored inside the front frame 1 and is supported by the bumper beam 3 via a coil spring 9 attached to the rear of the bumper beam 3. As in the second embodiment, a gap 7 is formed between the honeycomb structure 5 and the honeycomb pressing portion 6 fixedly supported on the front frame 1.

Since the vehicle shock absorbing device of this embodiment is configured as described above, the honeycomb structure 5 will not be damaged even if the bumper beam 3 is slightly curved in a light collision, and the bumper stay will not be damaged in a normal collision. 4 is greatly curved and the honeycomb structure 5 collides with the honeycomb pressing portion 6, the coil spring 9 and the honeycomb structure 5 work together to efficiently absorb the impact energy.

(Effects of the invention) As explained above, according to the impact absorption device for a vehicle according to the invention, it has a bumper stay that curves to absorb impact energy at the time of a collision, and a hollow part that extends in the longitudinal direction of the vehicle. A honeycomb structure that absorbs impact energy by buckling in the front-rear direction, and a honeycomb structure that faces the honeycomb structure through a gap and presses the honeycomb structure in the front-rear direction of the vehicle when the bumper stay is bent during a collision. When a vehicle has a light collision, the bumper beam absorbs the impact energy by bending and deforming, and the honeycomb structure does not press the honeycomb pressing part, so the honeycomb structure When a vehicle is in a normal collision, the bumper stay is greatly curved and the honeycomb pressing part presses against the honeycomb structure, causing the honeycomb structure to buckle and deform in the longitudinal direction of the vehicle, effectively absorbing the impact force. absorb into.

Therefore, according to the present invention, in the event of a light collision, the bumper stay absorbs the impact force, so the honeycomb structure is not damaged, and in the event of a normal collision, the bumper stay and the honeycomb structure work together to ensure the impact force is absorbed. can be absorbed into.

[Brief explanation of drawings]

1 and 2 show a shock absorbing device for a vehicle according to a first embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is a plan view, and FIG. 3 is a second embodiment of the present invention. FIGS. 4 and 5 show a third embodiment of the present invention, FIG. 4 is a plan view, FIG. 5 is a sectional view taken along the - line in FIG. FIG. 4 is a cross-sectional view of the fourth embodiment. DESCRIPTION OF SYMBOLS 1...Front frame, 3...Bumper beam, 4...Bumper stay, 5...Honeycomb structure, 6...Honeycomb pressing part, 7...Gap.

Claims (1)

[Claims for Utility Model Registration] A bumper beam that extends in the width direction of the vehicle, and a bumper that has one end that holds the bumper beam and the other end that is held by a vehicle body member, and that bends in the event of a collision to absorb impact energy. A stay is provided on one of the bumper beam and the vehicle body member so as to be located between the bumper beam and the vehicle body member, and has a hollow portion extending in the longitudinal direction of the vehicle, and has a hollow portion extending in the longitudinal direction of the vehicle in the event of a collision. A honeycomb structure that absorbs impact energy by buckling and deforming is provided on the other of the bumper beam and the vehicle body member so as to face the honeycomb structure with a gap therebetween, and the bumper stay is disposed at the time of a collision. and a honeycomb pressing portion that presses the honeycomb structure in the longitudinal direction of the vehicle to buckle and deform the honeycomb structure when the honeycomb structure is bent.