JP2006240428A - Structure of bumper for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently absorb an input load, in a structure of a bumper for a vehicle wherein an energy absorbing element is composed of an energy absorbing element main body and a reinforcing energy absorbing element. <P>SOLUTION: The energy absorbing element 3 is composed of the energy absorbing main body 8, and the reinforcing energy absorbing element 9 provided on the outside of a vehicle in a vehicular fore-and-aft direction in the energy absorbing main body 8. A fitting surface 10 between the energy absorbing main body 8 and the reinforcing energy absorbing element 9, is undulated in the vehicular fore-and-aft direction, and formed in a wave shape continuing in a vehicular width direction. Therefore, a load in the vehicular fore-and-aft direction inputted in the reinforcing energy absorbing element 9 is dispersed in the vehicular fore-and-aft direction and the vehicular width direction by the fitting surface 10, so that an input load is absorbed a wide range of the energy absorbing element 3. Consequently, the input load can be efficiently absorbed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle bumper structure used in a vehicle such as a passenger car.

2. Description of the Related Art Conventionally, a vehicle bumper structure having a bumper reinforcement and an energy absorber that is attached to the outside of the vehicle in the bumper reinforcement and absorbs an input load is known. In such a vehicle bumper structure, an energy absorber is composed of an energy absorber body and a reinforcing energy absorber attached to the outside of the energy absorber body (see, for example, Patent Document 1). ).
JP 2003-146157 A

  In this structure, since the mating surface of the energy absorber body and the reinforcing energy absorber is a single plane, the load transmission is only in the vehicle longitudinal direction, and the energy absorber can only be used in the vehicle longitudinal direction. There is a problem that the efficiency of energy absorption is bad. Therefore, in order to sufficiently absorb energy, the thickness of the energy absorber in the front-rear direction must be increased, which has a problem of restricting the vehicle design.

  Patent Document 1 discloses a structure in which the mating surfaces of the energy absorber main body and the reinforcing energy absorber are formed in an uneven shape in order to attach the energy absorber for reinforcement to the energy absorber main body. However, even in this structure, the energy absorption efficiency is poor because the mating surface of the energy absorber body and the reinforcing energy absorber is a single plane at the bottom of the recess and the top of the projection.

  An object of the present invention is to make it possible to efficiently absorb an input load in a vehicle bumper structure in which the energy absorber includes an energy absorber body and a reinforcing energy absorber.

  The present invention includes a bumper reinforcement provided at an end portion in the front-rear direction of the vehicle, and an energy absorber that is attached to the outer side of the vehicle in the front-rear direction of the vehicle and absorbs an input load. In the vehicle bumper structure, the energy absorber is composed of an energy absorber body and a reinforcing energy absorber provided outside the vehicle in the vehicle front-rear direction of the energy absorber body, and these energy absorbers The main feature is that the mating surfaces of the main body and the reinforcing energy absorber are undulated in the vehicle front-rear direction and formed into a continuous wave shape along the vehicle width direction.

  According to the present invention, the energy absorber is composed of an energy absorber body and a reinforcing energy absorber provided outside the vehicle in the vehicle longitudinal direction of the energy absorber body. By making the mating surface of the reinforcing energy absorber undulate in the vehicle longitudinal direction and forming a continuous wave shape along the vehicle width direction, the load in the vehicle longitudinal direction input to the reinforcing energy absorber is Since the mating surfaces disperse in the vehicle front-rear direction and the vehicle width direction, the input load is absorbed in a wide range of the energy absorber, and the input load can be efficiently absorbed.

  An embodiment of the present invention will be described with reference to the drawings. The present embodiment is an application example to a vehicle bumper structure provided at a front end portion of a vehicle.

  FIG. 1 is a perspective view showing a vehicular bumper structure 1 according to the present embodiment in a cross-section at the center, FIG. 2 is a horizontal cross-sectional view showing the vehicular bumper structure 1, and FIG. It is sectional drawing.

  As shown in FIGS. 1 and 2, the vehicle bumper structure 1 includes a bumper reinforcement 2, an energy absorber 3, a bumper face 4, and the like.

  The bumper reinforcement 2 extends in the vehicle width direction at the front end portion of the vehicle, and straddles the left and right side members 6 and 7 via the bumper stay 5.

  The energy absorber 3 is attached to the vehicle outer side (the front side in the present embodiment) in the bumper reinforcement 2 and absorbs (attenuates) a load input from the vehicle front direction to the energy absorber 3. .

  The energy absorber 3 includes an energy absorber body 8 and a reinforcing energy absorber 9 provided outside the vehicle in the longitudinal direction of the vehicle in the energy absorber body 8. The hardness of the reinforcing energy absorber 9 is higher than the hardness of the energy absorber body 8. The energy absorber body 8 and the reinforcing energy absorber 9 are formed of a plastic foam molded body.

  The energy absorber body 8 extends in the vehicle width direction, and its rear surface side is fixed to the bumper reinforcement 2. On the front side of the energy absorber 3, a mounting recess 8 a extending in the vehicle width direction in which the reinforcing energy absorber 9 is fitted is formed.

  The reinforcing energy absorber 9 is fixed in a state of being fitted into the mounting recess 8a of the energy absorber body 8, and extends in the vehicle width direction.

  A joining surface 10 of the energy absorber 3 and the reinforcing energy absorber 9 in the vehicle front-rear direction is formed in a wave shape that undulates in the vehicle front-rear direction and continues along the vehicle width direction. . In this embodiment, the wave shape of the mating surface 10 is a sine wave shape, and the wave shape of the mating surface 10 is formed symmetrically with respect to the center plane 11 of the energy absorber 3 in the vehicle left-right direction.

  The bumper face 4 is attached to the energy absorber 3 so as to cover the front and sides of the energy absorber 3.

  In such a configuration, as shown in FIG. 3, the reinforcing energy absorber 9 and the energy absorption against the load F input to the reinforcing energy absorber 9 through the bumper face 4 from the front of the vehicle by an obstacle. The input load component F1 on the mating surface 10 with the body 3 is dispersed into a load F2 toward the rear of the vehicle and a load F3 toward the vehicle width direction. Thereby, the input load F will be absorbed in the wide range of the energy absorber 3, and the input load F can be absorbed efficiently. Since the input load F can be efficiently absorbed in this way, the energy absorber body 8 can be made thinner than the conventional one, and the degree of freedom in vehicle design can be improved.

  At this time, in the energy absorber 3, the load F3 dispersed in the vehicle width direction cancels out in the compression direction for each wavelength, so that the energy absorber 3 is not deformed in the vehicle width direction in appearance.

  Next, a modification of the wave shape of the mating surface 10 between the energy absorber body 8 and the reinforcing energy absorber 9 will be described. FIG. 4 is a horizontal sectional view showing the mating surface 20 portion of the first modified example, and FIG. 5 is a horizontal sectional view showing the mating surface 30 portion of the second modified example.

  As shown in FIG. 4, the wave shape of the mating surface 10 of the first modification is a triangular wave shape, and as shown in FIG. 5, the wave shape of the mating surface 30 of the second modification is a cycloid shape.

  In such a configuration, similarly to the mating surface 10 described above, the reinforcing energy absorber 9 against the load F input to the reinforcing energy absorber 9 from the front of the vehicle via the bumper face 4 by an obstacle. The input load component F1 on the mating surface 20 or 30 between the energy absorber 3 and the energy absorber 3 is dispersed into a load F2 toward the rear of the vehicle and a load F3 toward the vehicle width direction. Thereby, the input load F will be absorbed in the wide range of the energy absorber 3, and the input load F can be absorbed efficiently.

  The present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention. For example, the vehicle bumper structure may be provided at the rear end of the vehicle.

1 is a perspective view showing a vehicular bumper structure according to an embodiment of the present invention in a cross section at a central portion. It is a horizontal sectional view showing a bumper structure for vehicles. It is a horizontal sectional view showing a mating surface portion. It is a horizontal sectional view showing the mating surface portion of the first modification. It is a horizontal sectional view showing the mating surface portion of the second modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bumper structure for vehicles 2 Bumper reinforcement 3 Energy absorber 8 Energy absorber main body 9 Reinforcing energy absorber 10 Matching surface 11 Center surface 20 Matching surface 30 Matching surface

Claims (5)

A bumper structure for a vehicle comprising a bumper reinforcement provided at an end portion in the front-rear direction of the vehicle, and an energy absorber that is attached to the outside of the vehicle in the front-rear direction of the vehicle and absorbs an input load. In
The energy absorber is composed of an energy absorber body and a reinforcing energy absorber provided outside the vehicle in the vehicle front-rear direction of the energy absorber body, and the energy absorber body and the reinforcing energy absorber. A bumper structure for a vehicle, wherein the mating surfaces of the bodies are undulated in the vehicle front-rear direction and formed into a continuous wave shape along the vehicle width direction.   The vehicular bumper structure according to claim 1, wherein the wave shape of the mating surface is formed symmetrically with respect to a center plane of the energy absorber in the left-right direction of the vehicle.   The bumper structure for a vehicle according to claim 1, wherein the wave shape of the mating surfaces is a sine wave shape.   The bumper structure for a vehicle according to claim 1, wherein the wave shape of the mating surfaces is a triangular wave shape. The bumper structure for a vehicle according to claim 1, wherein the wave shape of the mating surfaces is a cycloid shape.

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