JPH0995189A - Bumper reinforcement construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a collision energy absorbing quantity by improving bumper reinforcement of a front bumper for vehicle. SOLUTION: In bumper reinforcement interposed between a shock absorption member 2 on the front end of a front side member 1 and a front bumper 4, the bumper reinforcement 3 is formed into a hat-shaped section opening the rear side, the front ends 21 of the shock absorption members 2 projected from right and left front side members 1 are put in the bumper reinforcement 3 so as to be able to set longer the length of the shock absorption member 2 in the longitudinal direction, and hence a collision energy absorbing quantity at frontal collision of a vehicle is increased.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a vehicle front bumper has a structure in which a shock absorbing member is provided between the front bumper and a vehicle body to absorb a collision load by compressive deformation of the shock absorbing member during a frontal collision of the vehicle. That is, as shown in FIGS. 5 and 6, the front side members 1 provided on the left and right sides of the vehicle are provided at their front ends 12 with shock absorbing members 2 extending forward. Further, a bumper reinforcement 3B having a closed cross-section structure extending over the left and right impact absorbing members 2 is attached to the front end 21 of the impact absorbing member 2, and the front bumper 4 made of synthetic resin is covered so as to cover the bumper reinforcement 3B. It has a structure with attached.

As a conventional structure, as shown in FIG. 7, there is a structure in which a lamp 7 is installed above an upper rear end of a front bumper 4, and this type of structure has front ends of the left and right front side members 1. A first retainer 5 is provided on each of the side surfaces of the shock absorbing member 2 provided in 12 in the standing direction, and a plate-shaped second retainer 5 extending between the upper ends of the left and right first retainers 5 extends in the vehicle width direction. The retainer 6 is provided and the second
There is a structure in which the upper rear end of the front bumper 4 is superposed on the upper surface of the retainer 6 and the lamp 7 is fixed to the second retainer 6 via the front bumper 4.

[0004]

However, the bumper reinforcement 3B of the above-described conventional structure has a closed cross-section structure for ensuring strength, and the length in the vehicle front-rear direction becomes long, and the impact is accordingly increased. The length of the absorbent member 2 protruding from the front end 12 of the front side member 1 is restricted. Therefore, the amount of compressive deformation (stroke) of the shock absorbing member 2 is small, the amount of energy absorption is reduced, and the damage to the vehicle body during a frontal collision of the vehicle is large. Also, if the amount of energy absorbed is small, the impact at the time of a collision is likely to act on the vehicle body.Therefore, in a vehicle equipped with an airbag, even if the collision is relatively small, the sensor may detect this and the airbag may be uselessly operated. There is.

Further, in the case of an offset frontal collision in which the collision occurs outside the center axis of the vehicle body, as shown in FIG. 6, the bumper reinforcement 3B is not deformed and is centered on the joint point of the end portion on the non-collision side. Rotate to. As a result, a load acts on the front side member 1 from an oblique direction to cause inward bending, the amount of energy absorbed by axial compression is reduced, and the vehicle body is greatly damaged.

Further, in the conventional structure for mounting the lamp 7 on the front bumper 4, it is necessary to provide the first and second types of retainers 5 and 6, and a simpler mounting structure is required.

Therefore, the present invention provides a bumper reinforcement structure for a front bumper which increases the amount of collision energy absorbed in a frontal collision and axially applies a load acting on a front side member even in an offset frontal collision. It was made as. Another object of the present invention is to realize a bumper reinforcement structure that increases the amount of collision energy absorption and simplifies lamp mounting.

[0008]

According to the present invention, as shown in FIGS. 1 and 2, a bumper reinforcement 3 having a hat-shaped cross section with an opening on the rear side is used to project to the front ends 12 of the left and right front side members 1. Shock absorbing member 2
I wrapped it up. Therefore, the length of the impact absorbing member 2 in the vehicle front-rear direction can be set long, and the amount of collision energy absorption becomes large. Further, since the bumper reinforcement 3 is bent at the time of offset collision, the collision load acts in the axial direction of the front side member 1 and the inner bending of the front side member does not occur (claim 1).

Further, according to the present invention, the front surface of the bumper reinforcement 3 has a curved shape in which the central portion in the longitudinal direction (vehicle width direction) is projected, and the bead 32 is formed on the front surface portion 31 of the bumper reinforcement 3. As a result, the strength required to reinforce the front bumper 4 is obtained (claim 2).

Further, according to the present invention, as shown in FIG. 4, the retainers 5 are erected on the left and right impact absorbing members 2, and the upper end rear end 36 of the bumper reinforcement 3 having the hat-shaped cross section is laid on the retainers 5. It is fixed, and the upper rear end of the front bumper 4 is superposed and fixed on it. As a result, the upper rear end of the front bumper 4 has sufficient strength without the need to hang another retainer on the left and right retainers 5 as in the conventional case. Therefore, the vehicle front lamp 7 is attached to the upper rear end of the front bumper 4. Can be attached (Claim 3).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. A pair of left and right front side members 1 (only one of which is shown in FIG. 1) provided in the front portion of the vehicle body and extending in the front-rear direction are provided from the general portion 11 to the front end 12.
The front end 12 is open, and the front end 12 is open. An impact absorbing member 2 having a closed cross-sectional structure that extends the general portion 11 of the front side member 1 is provided at the front end 12 of each of the pair of left and right front side members 1 so as to project forward. 22 is a crush bead.

The front ends 21 of the pair of left and right impact absorbing members 2
A bumper reinforcement 3 is provided in the vehicle in the vehicle width direction. The bumper reinforcement 3 has a shape in which a metal plate is formed in a hat-shaped cross section that opens toward the rear of the vehicle. Further, the bumper reinforcement 3 has a curved shape of a mountain shape in a plan view in which a central portion in the longitudinal direction (vehicle width direction) projects. Furthermore, a plurality of beads 32 are provided in the longitudinal direction on the front surface portion 31 of the bumper reinforcement 3 in an uneven cross-sectional shape. The bumper reinforcement 3 is installed so as to hold the front ends 21 of the left and right impact absorbing members 2 inside the opening, and is installed in the vehicle width direction.
The front surface portion 31 and the front end surface of the shock absorbing member 2 are fastened together. Further, on the outside of the bumper reinforcement 3, a front bumper 4 made of synthetic resin is fastened and fixed so as to cover the bumper reinforcement 3.

According to the bumper reinforcement structure of the first embodiment described above, the bumper reinforcement 3 is formed in a hat-shaped cross-section with the rear side opening, and the front end of the shock absorbing member 2 is inside the opening of the bumper reinforcement 3. Since the structure is made to allow 21 to enter, the axial length of the shock absorbing member 2 protruding from the front end 12 of the front side member 1 can be set longer than that of the conventional structure. Therefore, at the time of a frontal collision of the vehicle, the stroke of compression deformation of the shock absorbing member 2 due to the collision load becomes long,
The amount of impact energy absorbed by the impact absorbing member 2 can be increased.

The bumper reinforcement 3 is shown in FIG.
As shown in FIG.
3 and the lower surface portion 34 are opened in the vertical direction, and have a substantially flat cross section. Therefore, as shown in FIG. 2, during an offset frontal collision of the vehicle, the bumper reinforcement 3 is also bent and deformed in the front-rear direction of the vehicle, so that the collision load acts in the axial direction of the front side member 1 and the front side member 1 The collision energy can be absorbed efficiently without inward bending.

Although the bumper reinforcement 3 has an open cross-section structure, the front surface portion 31 has a central portion in the longitudinal direction thereof projected toward the front to increase the width of the central portion, and a bead 32 is formed on the front surface portion 31. Therefore, it is not deformed by a small collision such as contact. Further, since the collision energy is absorbed in a long stroke and the impact on the vehicle body is mitigated, the sensor does not detect the impact and the airbag does not operate unnecessarily when the airbag does not require the impact. .

A second embodiment of the present invention will be described with reference to FIG. The basic structure is almost the same as that of the above-described first embodiment, and the differences will be mainly described below. As shown in the figure, a bumper reinforcement 3A having a hat-shaped cross section with an opening on the rear side has a step 35 on the upper surface 33 thereof.
Is formed, and the rear end 36 of the upper surface portion is projected upward so that the vertical width of the opening is wide. On the other hand, the bumper reinforcement 3A is provided on the outer surface of the left and right impact absorbing members 2.
Retainers 5 are erected at positions corresponding to the rear end 36 of the upper surface portion. The retainer 5 has its upper end projected above the shock absorbing member 2 and is fixed to the outer surface of the shock absorbing member 2 by welding or fastening. Then, the upper end rear end 36 of the bumper reinforcement 3A is laid across the upper ends of the left and right retainers 5, and the upper end of the retainer 5 and the upper end rear end 36 are fastened and coupled. is there. The upper rear end of the front bumper 4 that covers the bumper reinforcement 3A is fastened and fixed to the upper end rear end 36 of the bumper reinforcement 3A by overlapping the upper rear end from the top. Then, the lower end of the lamp 7 at the front of the vehicle is fastened and fixed from above the upper rear end of the front bumper 4.

According to the second embodiment described above, in the event of a vehicle collision, the same effect as that of the first embodiment can be obtained, and the upper rear end of the front bumper 4 is provided with the bumper reinforcement 3A. Since the structure is such that it is supported by the rear end 36 of the upper surface part, the strength of the upper rear end of the front bumper 4 can be secured by providing only one type of retainer 5 as compared with the conventional structure, and the structure for mounting the lamp 7 fixed to this can be improved. Low cost simplification is achieved.

[0018]

According to the present invention, the amount of collision energy absorbed at the time of a frontal collision is increased, and particularly at the time of an offset frontal collision, the collision load acting on the front side member via the bumper reinforcement is set in the axial direction, and the front side is The efficiency of absorbing the collision energy of the members can be improved, and damage to the vehicle body can be minimized. Further, the mounting of the lamp on the front of the vehicle can be made simple and strong by utilizing the strength of the bumper reinforcement.

[Brief description of drawings]

FIG. 1 is a side view showing a bumper reinforcement structure according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view of a bumper reinforcement structure for explaining a modification of the first embodiment of the present invention during a collision.

FIG. 3 is a side view showing the deformation of the bumper reinforcement of the present invention during a collision.

FIG. 4 is a side view showing a bumper reinforcement structure according to a second embodiment of the present invention and a vehicle front lamp mounting structure to which the bumper reinforcement structure is applied.

FIG. 5 is a side view showing a conventional bumper reinforcement structure.

FIG. 6 is a schematic plan view showing a modification of the conventional bumper reinforcement structure at the time of collision.

FIG. 7 is a side view showing a conventional vehicle front lamp mounting structure corresponding to FIG. 4;

[Explanation of symbols]

 1 front side member 2 shock absorbing member 3, 3A bumper reinforcement 31 front part of bumper reinforcement 32 bead 33 upper surface of bumper reinforcement 4 front bumper 5 retainer 7 vehicle front lamp

Claims (3)

[Claims] 1. A front bumper reinforcement of a front bumper is installed between front ends of left and right front side members of a vehicle by projecting shock absorbing members extending forward of the front side members. In the bumper reinforcement structure, the bumper reinforcement is formed in a hat-shaped cross-section that opens rearward, and the bumper reinforcement and the shock absorbing member are combined so as to hold the front end of the shock absorbing member inside the opening, Bumper reinforcement structure characterized by mounting a front bumper so as to cover the outer surface of the bumper reinforcement. 2. A bead extending in the longitudinal direction of the bumper reinforcement is formed on the front surface portion of the bumper reinforcement to make the front surface uneven, and the front surface portion has a longitudinal central portion that extends forward. The bumper reinforcement structure according to claim 1, wherein the bumper reinforcement structure has a curved shape. 3. A retainer projecting upward is provided on a side surface of each of the left and right impact absorbing members, and a rear end of an upper surface portion of the bumper reinforcement is bridged between upper ends of the left and right retainers to be mounted on an upper end of the retainer. 2. The bumper reinforcement structure according to claim 1, wherein the bumper reinforcement structure is fixed, and an upper rear end of a front bumper is overlapped and fixed to a rear end of the upper surface portion, and a vehicle front lamp is fixed to an upper rear end of the front bumper.