JP2002067840A - Bumber reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the collisional energy absorbing amount when a vehicle makes a head-on collision. SOLUTION: A bumper reinforcement 3 is composed of an outer member 31 having a hat-shaped section opening toward behind the vehicle and an inner member 35 to form a closed section such that only the opening in the center across the vehicle width of the outer member 31 is blocked, and the front extremity of a shock absorbing member 2 installed at the front extremity of each of the left and right front side members 1 is allowed to intrude into the opening at the left/right end of the outer member 31, and the front extremities are coupled with the rear surface of the front part of the outer member 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper reinforcement structure for a front bumper mounted on a vehicle body via a shock absorbing member.

[0002]

2. Description of the Related Art Conventionally, an impact absorbing member is provided between a bumper reinforcement and a vehicle body in a front bumper of a vehicle, and absorbs a collision load by axially compressive deformation of the impact absorbing member at the time of a frontal collision of the vehicle. Some are structured.
That is, as shown in FIGS. 5 and 6, a shock absorbing member 2A is attached to the front ends of the left and right front side members 1 of the vehicle so as to extend them forward. A bumper reinforcement 3A having a closed cross-section structure to be bridged between the members 1 is attached, and a front bumper 4 made of synthetic resin is attached so as to cover the bumper reinforcement 3A.

[0003]

However, the bumper reinforcement 3A of the conventional structure has a high rigidity closed cross-sectional structure as a whole in order to secure the strength, and the bumper reinforcement 3A is further more than the shock absorbing member 2A. Since the front position is set, the length of the shock absorbing member 2A is restricted. Therefore, the amount of axial compression deformation of the shock absorbing member 2A is small, the amount of energy absorption is reduced, and the vehicle body may be damaged at the time of a head-on collision of the vehicle. In addition, at the time of an offset frontal collision in which the collision occurs on the outer side of the center axis of the vehicle body, the bumper reinforcement 3A does not deform, and there is a problem that the deformation damage of the partner vehicle body increases.

Accordingly, it is an object of the present invention to provide a bumper reinforcement structure capable of increasing the amount of collision energy absorption at the time of a head-on collision and reducing the deformation damage of the opponent vehicle body at the time of an offset head-on collision. Things.

[0005]

According to the present invention, there is provided a bumper reinforcement structure in which left and right ends of a bumper reinforcement of a front bumper are attached to front ends of left and right front side members of a vehicle via a shock absorbing member. The reinforcement comprises an outer member having a hat-shaped cross section that opens toward the rear of the vehicle, and a flat inner member that forms a closed cross section by closing only the center portion of the outer member in the vehicle width direction. The front end of the shock absorbing member provided at the front end of the front side member is inserted into the opening at both left and right ends of the front member, and the front end is connected to the front surface of the outer member. Since the bumper reinforcement has a closed cross-section at the center in the vehicle width direction, the bending resistance at the center is ensured. In addition, the left and right ends have an open cross section, and the shock absorbing member is inserted into the open section, so that the length of the shock absorbing member can be set longer without projecting the bumper reinforcement forward, and the axial direction can be set. The collision energy absorption due to the compression deformation increases. In addition, since the rigidity of the left and right ends of the bumper reinforcement is reduced, damage to the partner vehicle body can be reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3, 1
Is a pair of left and right front side members disposed in the front-rear direction of the vehicle body, 2 is a shock absorbing member attached to the front end of the front side member 1 in the extension direction thereof, and 3 is a section rigidity having a closed section only at the center in the vehicle width direction. Reference numeral 4 denotes a front bumper made of a synthetic resin that covers the bumper reinforcement 3.

[0007] The front side member 1 is made of a rectangular tubular long member formed in a square closed cross section. A flange 12 projecting outward is formed on the four sides of the opening at the front end, and a rectangular fastening plate 6 larger than the cross section of the front side member 1 is welded to the front side of the flange 12. .

The shock-absorbing member 2 is made of a metal plate, is a rectangular tube-shaped short member having the same cross-section as that of the front side member 1 and having a rectangular cross-section. A bead 25 is provided. Flanges 23 projecting outward are formed on both left and right sides of the opening at the front end of the shock absorbing member 2. Further, a flange 24 projecting outward is bent at the four sides of the opening at the rear end, and the coupling plate 7 is welded to the rear surface side of the flange 24. The coupling plate 7 has the same shape as the fastening plate 6.

The bumper reinforcement 3 has an outer member 31 formed in a hat-shaped cross section that opens toward the rear of the vehicle and extends in the vehicle width direction, and closes an opening at a central portion in the vehicle width direction except for both ends of the outer member 31. The upper and lower edges of the inner member 35 are welded to a hat flange 32 formed at the upper and lower edges of the open end of the outer member 31.

The left and right shock absorbing members 2 have their front ends inserted into the openings at the left and right ends of the outer member 31 of the bumper reinforcement 3, and are welded and fixed to the vertical back surface of the outer member 31 by the flange 23. A coupling plate 7 provided at a rear end is provided with a fastening plate 6 provided at a front end of the front side member 1.
The bumper reinforcement 3 is attached to the front end of the front side member 1 via the shock absorbing member 2 by fastening the coupling plate 7 and the fastening plate 6 with bolts and nuts (not shown) at these four corners. . Both terminals of the bumper reinforcement 3 project outward beyond the front side member 1. Both ends of the inner member 35 of the bumper reinforcement 3 extend to near the shock absorbing member 3.

According to this structure, the bumper reinforcement 3 has a closed cross-sectional structure at the center in the vehicle width direction by the outer member 31 and the inner member 35, so that the center of the bumper reinforcement 3 has a sufficient bending strength. And a shock absorbing member 3 which does not bend inward at the central portion during a head-on collision.
The axial compressive load is transmitted to the motor to absorb shock. In addition, it is possible to prevent entry into vehicle body components such as a radiator. Then, the front end of the shock absorbing member 2 is inserted into the openings of the outer members 31 at the left and right ends of the bumper reinforcement 3 and attached, so that the length of the shock absorbing member 2 in the front-rear direction is a conventional full-length closed cross-sectional structure. The length can be set longer than the bumper reinforcement, and accordingly, the axial compression deformation stroke increases, the collision energy absorption increases, and the effect on the vehicle body during a frontal collision is reduced.

On the other hand, at the time of an offset head-on collision, as shown in FIG. 4, the bumper reinforcement 3 simultaneously compresses and deforms the shock absorbing member 2 in the axial direction, and at the same time, one of the left and right ends of the outer member 31 faces obliquely rearward on the outside of the vehicle. As a result, it is plastically deformed and bent with the collision partner vehicle body 5, and mutually absorbs collision energy, so that damage to the partner vehicle body 5 can be reduced.

The bumper reinforcement 3 is attached to the left and right ends of the outer member 31 on the outer side of the vehicle in advance.
If an inclined surface is formed by slightly bending the vehicle toward the outside diagonally rearward, an initial contact due to a gap generated between the opponent vehicle body 5 and the inclined surface of the bumper reinforcement 3 in the initial stage of an offset head-on collision. The surfaces are small, and they are gradually contacted with each other along the inclined surface to increase the contact area, so that plastic deformation is performed mutually, and the collision energy is efficiently absorbed, so that damage to the opponent vehicle body 5 is further reduced. be able to.

[0014]

According to the present invention, it is possible to increase the amount of collision energy absorbed at the time of a vehicle collision, and to secure the cross-sectional bending strength of the central portion of the bumper to suppress the entry into the vehicle body at the time of a frontal collision. Can be. Further, at the time of an offset head-on collision, damage to the opponent vehicle body can be suppressed to a small value.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a bumper reinforcement structure of the present invention.

FIG. 2 is a sectional view taken along a line II-II in FIG.

FIG. 3 is a sectional view taken along a line III-III in FIG. 1;

FIG. 4 is a schematic plan view showing a modification at the time of an offset head-on collision.

FIG. 5 is a schematic plan view showing a conventional bumper reinforcement structure.

FIG. 6 is a sectional view taken along a line VI-VI in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front side member 2 Shock absorbing member 3 Bumper reinforcement 31 Outer member 35 Inner member 4 Front bumper

Claims (1)

[Claims] 1. A bumper reinforcement structure in which left and right ends of a bumper reinforcement of a front bumper are attached to front ends of left and right front side members of a vehicle via a shock absorbing member, wherein the bumper reinforcement is directed rearward of the vehicle. An outer member having a hat-shaped cross section and an inner member having a flat plate-like shape that forms a closed cross-section by closing only the central portion in the vehicle width direction of the outer member. A bumper reinforcement structure wherein a front end of a shock absorbing member provided at a front end of a front side member is inserted, and the front end is connected to a front surface of an outer member.