JP2002249008A - Bumper mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide bumper mounting structure capable of relieving the damage to a car body by excellently absorbing collision energy exerted on a bumper during collision. SOLUTION: A crush box 5 (an impact absorbing member) forming a closed section and extending in the longitudinal direction of a vehicle is mounted on the fronts of the two end parts of a cross member 4 to intercouple the front end parts of right and left side rails 2 in the direction of a car width. A bracket 6 to close the opening part of the front and protrude externally of the width direction of a vehicle and bend its outside end approximately in an L-shape toward the rear of the vehicle to form a rise surface 6a extending along the longitudinal direction of a vehicle is mounted on the front of the crush box 5. A bumper stay 3 to support a bumper 1 from the rear surface side is mounted on the rise surface 6a, extending along the longitudinal direction of a vehicle, of the bracket 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper mounting structure.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of a conventional bumper mounting structure. FIG. 5 is a top view of a place where the front end of a left side rail in the vehicle width direction and a bumper are mounted. Is a drawing of the side view (viewed along the line VI-VI in FIG. 5).

As shown here, in a vehicle such as a large truck, a bumper 1 and left and right side rails 2 are provided.
(Only the left side is shown in the figure) and a front end portion of the side rail 2 made of a channel material having a U-shaped cross section. A bracket portion 2a is formed integrally with the front portion of the bracket portion 2a such that only the side portion and the bottom portion are extended forward.
The front end of the bumper stay 3 is bent outward in the vehicle width direction and is bolted to the bumper 1 in a state in which the front end of the bumper stay 3 is bent outward in the vehicle width direction.

[0004] In the drawing, reference numeral 4 denotes a cross member connecting the front ends of the left and right side rails 2 in the vehicle width direction. The cross member 4 is formed of a channel member having a U-shaped cross section. Have been.

[0005]

However, in such a conventional structure, most of the collision energy applied to the bumper 1 at the time of a vehicle collision is directly transmitted to the side rail 2 via the bumper stay 3, and the side rail 2 2
There is a risk that the vehicle body will be deformed and the vehicle body will be greatly damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a bumper mounting structure capable of satisfactorily absorbing collision energy applied to a bumper at the time of a collision and reducing damage to a vehicle body. I have.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a shock absorber extending in the vehicle front-rear direction with a closed cross section at the front of both ends of a cross member connecting the front ends of left and right side rails in the vehicle width direction. An absorbing member is attached, and the front surface of the shock absorbing member is covered with an opening of the front surface to protrude outward in the vehicle width direction, and the outer end thereof is bent substantially in an L-shape toward the rear of the vehicle and extends along the vehicle front-rear direction. The present invention relates to a bumper mounting structure in which a bracket that forms an upright surface is mounted, and a bumper stay that supports the bumper from a rear surface side is mounted on the upright surface of the bracket along the vehicle front-rear direction.

[0008] According to this configuration, the collision energy applied to the bumper at the time of collision of the vehicle is input to the upright surface of the bracket along the vehicle front-rear direction via the bumper stay, and the force for pulling the upright surface backward. As a result, a force for compressing rearward acts on the front surface of the shock absorbing member from a slightly offset direction, whereby the shock absorbing member is buckled and deformed prior to the peripheral structure. As a result of the collision energy being largely absorbed by the buckling deformation of the shock absorbing member, it is possible to prevent the large collision energy from directly acting on the side rail.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a top view of a bumper mounting structure according to this embodiment, and FIG. 2 is a side view thereof (the arrows II-II in FIG. 1). Sight), FIG.
Is a view taken along the line III-III in FIG. 2, and FIG. 4 is a view taken along the line IV-IV in FIG.
It is a drawing taken in the direction of an arrow, and the portions denoted by the same reference numerals as those in FIGS. 5 and 6 represent the same components.

As shown in the figure, in the present embodiment, a bracket portion integrally formed at the front end portions of the left and right side rails 2 in the conventional structure is eliminated, and the front end portions of the left and right side rails 2 are eliminated. At the front of both ends of a cross member 4 made of a channel material having a U-shaped cross section connecting the parts in the vehicle width direction, a cylindrical crash box 5 (shock absorption) that forms a closed cross section and extends in the vehicle front-rear direction Member) is the mounting seat 7
It is designed to be mounted via a.

The crush box 5 is formed of a relatively thin wall and has a structure which is easily buckled by a strong external force from the front. The buckling deformation absorbs the energy of the external force from the front. I can do it.

A mounting seat 7 interposed between the rear end of the crash box 5 and the front surface of the end of the cross member 4.
For example, as shown in FIG. 3, the four corners are bolted to the front surface of the end of the cross member 4 and are welded to the rear end of the crush box 5. It is so.

The front surface of the crash box 5 covers the opening of the front surface and projects outward in the vehicle width direction, and its outer end is bent substantially L-shaped (see FIG. 1) toward the rear of the vehicle. A bracket 6 is mounted so as to form an upright surface 6a extending in the vehicle front-rear direction.

Further, the rear end of the bumper stay 3 is overlapped with a standing surface 6a of the bracket 6 extending in the vehicle front-rear direction and bolted, and the front end of the bumper stay 3 is connected to the vehicle width direction. It is bent outward and is bolted to the bumper 1 in a state of being along the rear surface of the bumper 1.

The bracket 6 may be reinforced by appropriately attaching a rib or the like (not shown) to an edge portion.

If such a structure is adopted, the collision energy applied to the bumper 1 at the time of collision of the vehicle is input to the upright surface 6a of the bracket 6 along the vehicle longitudinal direction via the bumper stay 3, and the upright surface 6a 6a acts as a force to pull backward, so that a force for compressing backward acts on the front surface of the crash box 5 from a slightly offset direction, whereby the crash box 5 buckles prior to the peripheral structure. As a result, the buckling deformation of the crash box 5 largely absorbs the collision energy, so that it is possible to prevent the large collision energy from directly acting on the side rail 2.

Therefore, according to the above embodiment, the collision energy applied to the bumper 1 at the time of collision is reduced by the crash box 5.
Can be well absorbed by buckling deformation
Since the possibility that a large collision energy acts directly on the side rails 2 can be avoided beforehand, damage to the vehicle body at the time of collision can be significantly reduced as compared with the related art.

It should be noted that the bumper mounting structure of the present invention is not limited to the embodiment described above, and the shape of the closed cross section of the shock absorbing member is not limited to the illustrated example.
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0020]

According to the bumper mounting structure of the present invention described above, the collision energy applied to the bumper at the time of collision can be favorably absorbed by buckling deformation of the shock absorbing member, and large collision energy is applied to the side rail. Since the possibility of acting directly can be avoided beforehand,
It is possible to provide an excellent effect that the damage to the vehicle body at the time of the collision can be greatly reduced as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a partially cutaway top view showing an example of an embodiment of the present invention.

FIG. 2 is a view in the direction of arrows II-II in FIG. 1;

3 is a view in the direction of arrows III-III in FIG. 2;

FIG. 4 is a view in the direction of arrows IV-IV in FIG. 2;

FIG. 5 is a partially cutaway top view showing a conventional example.

FIG. 6 is a view in the direction of arrows VI-VI in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bumper 2 Side rail 3 Bumper stay 4 Cross member 5 Crash box (shock absorbing member) 6 Bracket 6a Standing surface

Claims (1)

[Claims] An impact absorbing member having a closed cross section and extending in the vehicle front-rear direction is mounted on the front surface of both ends of a cross member connecting front ends of left and right side rails in a vehicle width direction,
On the front surface of the shock absorbing member, an opening portion of the front surface is closed to protrude outward in the vehicle width direction, and the outer end thereof is bent substantially L-shaped toward the rear of the vehicle so as to form an upright surface along the vehicle front-rear direction. A bumper mounting structure, comprising: mounting a mounted bracket; and mounting a bumper stay for supporting the bumper from the rear side on an upright surface along the vehicle front-rear direction of the bracket.