JP2568316Y2 - Bumper mounting arm structure - Google Patents

Description

[Detailed description of the invention]

[0001]

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

[0002]

2. Description of the Related Art Conventionally, the function of a bumper mounted on an automobile is to absorb a shock in a light collision. Therefore, middle and high speed collisions have been intended to protect occupants by absorbing the impact at the front part of the vehicle body itself.

However, the vehicle body itself is being reduced in weight due to the improvement in fuel efficiency of automobiles, and it is economically advantageous to repair the vehicle after a light collision by replacing parts such as bumpers. Was desired.

Therefore, various types of shock absorbing structures for bumpers have been proposed, but the present invention is to add a shock absorbing function to a bumper mounting arm to a vehicle body because there is a limit to the shock absorbing performance of the bumper itself. .

[0005] As a shock absorbing structure of such a bumper mounting arm, Japanese Unexamined Patent Publication No. Hei.
52, a hollow rectangular cross-section provided with a beat that protrudes inward and outward is known.

[0006]

However, in the known structure, the impact is absorbed by buckling from the beat portion as a starting point, and the load curve with respect to the displacement has to be formed into a wavy shape, so that the structure is smooth. Shock absorption cannot be obtained.

Further, the hollow rectangular body buckles sequentially from the beat in the axial direction with respect to the shock in the axial direction, but has a problem that the hollow rectangular body breaks in the middle in the oblique direction. There were also difficulties in the moldability to obtain.

[0008]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above-mentioned problems, and has a substantially semi-circular shape which is paired so as to bend rather than buckle as an impact absorbing mechanism. Join the cylindrical body at the approximate center of the arc,
One of the strings has a bumper mounting portion, and the other has a body side member mounting portion.

Here, as a method of obtaining a shape joined by an arc portion, a semicircular tube may be formed separately and then joined by welding, rivets or the like, or may be integrally formed by extrusion or the like. May be.

[0010] In addition, a rib may be appropriately provided on the chord portion, and the string portion may be attached to the bumper and the side member with a bolt and nut. Further, it may be integrally welded to the bumper in advance.

[0011] That is, the object is achieved if it is interposed between the bumper and the vehicle body, and the mounting method may be arbitrarily selected.

Further, the amount of shock absorption can be appropriately selected by adjusting the length of the semi-cylinder, so that a so-called series according to the type of vehicle can be easily formed.

[0013]

[Function] When a shock is applied to the bumper, the shock is first absorbed by the deflection of the absorber attached to the bumper and the bumper reinforcement, and when the shock is larger than the absorbed amount, the shock is applied by the mounting arm according to the present invention. Is absorbed.

At this time, the substantially semicircular portion acts in the direction of bending deformation, but since it is joined at the arc portion, it can be absorbed even if an eccentric impact of about 30 ° is applied.

[0015]

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

FIG. 2 is a schematic view of a bumper device provided at the front or rear of the vehicle 1 shown in FIG.
FIG. 3 shows a schematic diagram of a cross section of a mounting portion of the bumper to the vehicle body.

A bumper consisting of an absorber 4 on a bumper reinforcement 3 and a bumper cover 5 on the outside thereof is mounted on bumper mounting arms 7, 7 '.
To the side members 6, 6 'of the vehicle body.

The absorber 4 is a low-density shock absorber made of urethane foam or polypropylene foam material, where a part of the impact energy is first absorbed.

Next, the bumper reinforcement 3 is made of an extruded aluminum material or a resin material, and a part of the impact energy is absorbed by the bending deformation and the cross-sectional buckling deformation.

When all of the impact force cannot be absorbed by the bumper reinforcement 3, the bumper mounting arms 7, 7 'are deformed, so that a larger impact force than before can be absorbed.

At this time, the forces acting on the arms 7, 7 'are transmitted from 7a, 7a' to 7c, 7c ', and
Although transmitted to the side members 6 and 6 'via b and 7b', the deformation load of the arm is set slightly smaller than the breaking load of the side members.

Then, the mounting arms 7, 7 'were deformed as shown in FIG. 4, and the displacement and load curves at that time were as shown in FIG.

As a result, the amount of shock absorption is increased more than before, and deformation of the vehicle body after the side member can be suppressed.

The predetermined amount of energy absorption can be easily obtained without deflecting the sectional shape by appropriately selecting the length of the arm in the cylinder direction.

[0025]

According to the arm shape according to the present invention, since the shock absorption utilizing the bending deformation starting from the substantially semicircular arc-shaped contact point is used, the shock absorption curve is continuously stable. Also,
An eccentric shock of about 30 ° can be absorbed.

The cross-sectional shape of the arm is limited in size depending on the specifications of the vehicle, but the vertical length has a large degree of freedom, so that a predetermined amount of energy absorption can be easily set. For example, if the same cross-sectional shape is used using an extruded aluminum shape or the like, it can be manufactured at very low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the outside of a vehicle.

FIG. 2 is a schematic view of a bumper device disposed at a front portion or a rear portion of the vehicle as viewed from above.

FIG. 3 is a schematic diagram of a cross section of a mounting portion of a bumper to a vehicle body.

FIG. 4 is a schematic view showing a deformed state of a bumper mounting arm.

FIG. 5 is a schematic view showing a deformation load state of a bumper mounting arm.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vehicle 2 ... Bumper 3 ... Bumper / Rin hose 4 ... Absorber 5 ... Bumper cover 6, 6 '... Side member 7, 7' ... Bumper mounting arm 7a, 7a ': front surface of the bumper mounting arm (bumper side) 7b, 7b': central portion of the bumper mounting arm 7c, 7c ': rear surface of the bumper mounting arm (vehicle side)

Claims (1)

(57) [Scope of request for utility model registration] 1. An arm structure for mounting a bumper to a vehicle body, a pair of substantially semicircular cylinders are joined by an arc portion, one of the chord portions has a bumper mounting portion, and the other chord portion has a vehicle body sand member. Using an arm with a mounting part ,
The semi-cylindrical direction is approximately perpendicular to the longitudinal direction of the damper.
Arm structure characterized by being attached to