JPH04310446A - Bumper device for vehicle - Google Patents

Abstract

PURPOSE:To make large an energy absorving amount in a bumper device as well as heighten the absorvable limit without making large the size. CONSTITUTION:An absoving member 8 is formed in semi-circular shape in section and of a circular-arc load bearing part 8b and a flat-shaped mounting part 8a, whereby energy absorption in a high load range is made possible and a sufficient bending amount to the high load range can be obtained.

Description

[Detailed description of the invention]

0001

[Purpose of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper device for a vehicle.

0003

2. Description of the Related Art Conventionally, as this type of bumper device, one disclosed in Japanese Utility Model Application Laid-Open No. 1-81150 is known. This covers the bumper reinforcement that is fixed to the vehicle body via the side member, the energy absorber installed on the load receiving surface side of the bumper reinforcement, and the reinforcement and energy absorber. The energy absorber has a bumper cover as an exterior, and the energy absorber has a rectangular cross section with a load receiving part and a mounting part. The absorbent member had a plurality of vertical rib portions.

0004

[Problems to be Solved by the Invention] However, in the bumper device described above, the energy of the load applied to the bumper device is absorbed by the buckling deformation of the absorbing member, so that the bumper device has characteristics as shown in line a in FIG. 13. Although it is possible to absorb energy up to a high load range, the amount of deflection up to that load range is small, making it difficult for the bumper device to absorb sufficient energy. In order to solve this problem, the absorbing member could be made larger, but in that case, the bumper device would become larger, which would not only have a negative impact on the design of the vehicle itself, but also pose a risk of significantly increasing the weight. .

Therefore, the technical object of the present invention is to provide an ideal bumper device that has a high limit of the load that can be absorbed by the bumper device and also has a large amount of energy absorption up to that load range. be.

[0006]

[Structure of the invention]

[0007]

[Means for Solving the Problems] The technical means taken in the present invention to solve the above technical problems is to provide an energy absorber with a semicircular cross section having an arc-shaped load receiving part and a planar mounting part. The absorbent member has a shaped absorbing member.

[0008]

[Operation] The above technical means operates as follows. The energy of the load applied to the bumper device is absorbed by the bending deformation of the absorbing member. This results in a characteristic as shown by line b in FIG. 13. As a result, the bumper device can have a high limit of the load that can be absorbed by the bumper device, and can also absorb a large amount of energy up to the load range.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, a vehicle 1
The bumper device 2 arranged at the rear of the bumper reinforcement 3, the energy absorber 4 and the bumper cover 5
It is composed of.

[0011] The bumper reinforcement 3 is formed by extrusion molding of aluminum material, has a rectangular cross section, and is fixed to the body 9 of the vehicle 1 via the side member 6. The energy absorber 4 is disposed on the load receiving surface 3a side of the bumper reinforcement 3, and includes a plurality of energy absorbing members 7 formed by extrusion molding of a low-density absorbing member 7 made of a urethane foam material and an aluminum material. It is composed of a high-density absorbing member 8. This absorbing member 8 is fixed to a load receiving surface 3a of a bumper reinforcement 3 at appropriate positions on both outer sides of a license plate 11, which will be described later, and the absorbing member 7 is disposed to surround the absorbing member 8. The bumper cover 5 is made of a resin material, is fixed to the vehicle body 9, covers the bumper reinforcement 3 and the energy absorber 4, and serves as the exterior of the vehicle 1. Further, a recess 10 is formed in a portion of the energy absorber 4 and the bumper cover 5 near the center in the longitudinal direction, and a license plate 11 is fixed to the recess 10.

As shown in FIG. 4, the absorbing member 8 has a planar mounting portion 8a that serves as a mounting surface to the bumper reinforcement 3, and an arc-shaped load receiving portion 8b that serves as a load receiving surface.
It has a semicircular shape consisting of.

The bumper device 2 having the above structure operates as follows.

When a load is applied due to a collision or the like, the energy is buffered by the bumper device 2 and transmitted to the vehicle 1. When a load is applied, the absorbing member 8 undergoes bending deformation and absorbs the energy, as shown in FIG. As shown in FIG. 6, its characteristics during deformation are that it is capable of absorbing energy in a high load range and that a sufficient amount of deflection can be obtained up to that load range. Thereby, the limit of the load that can be absorbed by the bumper device 2 can be increased without increasing the size of the bumper device 2, and the amount of energy absorbed by the bumper device 2 can be increased. In addition, since this deformation characteristic is a constant load type and shows a rectangular waveform, the limit load that can be absorbed by the bumper device 2 can be changed to various values by a relatively simple operation of just changing the plate thickness. Can be set to Incidentally, the bumper device 2 having the absorbing member 8 can be most effectively used for vehicle types in which the body durability of the vehicle 1 is limited.

Next, a first modification and a second modification of the present invention will be explained. Note that this bumper device 2 includes an absorbing member 12
, 13 are the same as those in this embodiment, so their explanation will be omitted.

As shown in FIG. 7, the absorbing member 12 of the first modified embodiment, which corresponds to the absorbing member 8 of the present embodiment, has a planar mounting portion 12a that serves as a mounting surface to the bumper reinforcement 3. and an arc-shaped load receiving portion 12 that serves as a load receiving surface.
It has a semicircular shape consisting of b. The mounting portion 12a and the load receiving portion 12b are connected by a rib portion 12c perpendicular to the mounting portion 12a within the closed cross section thereof.

In this configuration, when a load is applied due to a collision or the like, the energy is buffered by the bumper device 2 and transmitted to the vehicle 1. When a load is applied, the absorbing member 12
As shown in FIG. 8, the load receiving portion 12b undergoes bending deformation and the rib portion 12c causes buckling deformation to absorb the energy. As shown in FIG. 9, its characteristics during deformation are that it is capable of absorbing energy in a high load range and that a sufficient amount of deflection can be obtained up to that load range. This results in
The limit of the load that can be absorbed by the bumper device 2 can be increased without increasing the size of the bumper device 2, and the amount of energy absorbed by the bumper device 2 can be increased. In addition, since this characteristic during deformation shows a peak waveform, it is possible to absorb energy in a higher load range, and it can be used most effectively for vehicle models that have sufficient margin in the body durability of the vehicle 1. .

As shown in FIG. 10, the absorbent member 13 of the second modified embodiment corresponding to the absorbent member 8 of this embodiment is the same as the absorbent member 12 of the first modified embodiment corresponding to the absorbent member 8 of this embodiment. The bumper reinforcement 3 has a semicircular shape composed of a planar mounting portion 13a serving as a mounting surface to the bumper reinforcement 3 and an arc-shaped load receiving portion 13b serving as a load receiving surface. The mounting portion 13a and the load receiving portion 13b are connected by two rib portions 13c and 13d within their closed cross section. The rib portions 13c and 13d are arranged to have a triangular shape with the load receiving portion 13b as the apex.

In this configuration, when a load is applied due to a collision or the like, the energy is buffered by the bumper device 2 and transmitted to the vehicle 1. When a load is applied, the absorbing member 13
causes bending deformation and absorbs the energy, as shown in FIGS. 11a and 11b. As shown in FIG. 12, its characteristics during deformation are that it is capable of absorbing energy in a high load range and that a sufficient amount of deflection can be obtained up to that load range. Thereby, the limit of the load that can be absorbed by the bumper device 2 can be increased without increasing the size of the bumper device 2, and the amount of energy absorbed by the bumper device 2 can be increased. In addition, since this deformation characteristic exhibits a triangular waveform, it is possible to increase the amount of energy absorption, and it can be most effectively used in vehicle models that have sufficient body durability. sell. Note that the triangular shape exhibited by the ribs 13c and 13d may be a triangular shape with the load receiving portion 13b side as the apex.

[0020]

Effects of the Invention The present invention provides a bumper reinforcement that is fixed to a vehicle body via a side member, an energy absorber provided on the load receiving surface side of the bumper reinforcement, and a bumper reinforcement that is fixed to a vehicle body via a side member. In the vehicle bumper device, the vehicle bumper device includes a bumper cover that covers the energy absorber and serves as an exterior. Since the vehicle bumper device is configured with the absorbing member, the following effects can be achieved.

[0021] It is possible to absorb energy in a high load range, and a sufficient amount of deflection can be obtained up to that load range, thereby increasing the limit of the load that can be absorbed by the bumper device without increasing the size of the bumper device. In addition, the amount of energy absorbed by the bumper device can be increased.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vehicle equipped with a bumper device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. 1.

FIG. 3 is a sectional view of a bumper device according to the present invention.

FIG. 4 is a sectional view of the absorbent member in this example.

5 is a sectional view showing a deformed state of the absorbent member shown in FIG. 4. FIG.

FIG. 6 is a diagram showing the relationship between load and displacement when the absorbing member shown in FIG. 4 is deformed.

FIG. 7 is a sectional view of an absorbing member in a first modified example.

8 is a sectional view showing a deformed state of the absorbent member shown in FIG. 7. FIG.

9 is a diagram showing the relationship between load and displacement when the absorbing member shown in FIG. 7 is deformed; FIG.

FIG. 10 is a sectional view of an absorbing member in a second modified example.

11 is a sectional view showing a deformed state of the absorbent member shown in FIG. 10. FIG.

FIG. 12 is a diagram showing the relationship between load and displacement when the absorbing member shown in FIG. 10 is deformed.

FIG. 13 is a diagram illustrating the relationship between load and displacement during deformation, comparing the absorbing member of the present invention and a conventional device.

[Explanation of symbols]

3 Bumper reinforcement 4 Energy absorber 5 Bumper cover 6 Side members 8 Absorption member 9 Body (vehicle body) 8a Mounting part 8b Load receiving part 12c, 13c, 13d Rib part

Claims (1)

[Scope of Claims] [Claim 1] A bumper reinforcement fixed to a vehicle body via a side member; an energy absorber provided on a load receiving surface side of the bumper reinforcement; In a vehicle bumper device comprising reinforcement and a bumper cover that covers the energy absorber and serves as an exterior, the energy absorber includes:
A vehicle bumper device comprising an absorbing member having a semicircular cross section and an arcuate load receiving portion and a planar mounting portion.Claim 2: The absorbing member connects the load receiving portion and the mounting portion. The vehicle bumper device according to claim 1, further comprising a rib portion perpendicular to the mounting portion. 3. The vehicle bumper device according to claim 1, wherein the absorbing member has two rib portions connecting the load receiving portion and the mounting portion in a V-shape.