JP3322702B2 - Metal bumper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper made of metal such as aluminum for shock absorption used in automobiles and the like.

[0002]

2. Description of the Related Art As a bumper for an automobile, for example, as shown in FIG. 8, iron bumps (51) made of a resin foam covered with an outer shell (55) are conventionally provided on the rear of the bumper. (52) Reinforcing part made of resin, aluminum, etc.
The bumper (50) with the structure provided with is used.

However, it is difficult to recycle the above-mentioned bumper structure using a shock absorber (51) made of a resin foam for shock absorption, and it is not always desirable from the viewpoint of global environment conservation. there were.

Therefore, recently, as shown in FIG.
There has been proposed a recyclable metal bumper (53) made of an aluminum porous hollow extruded material in which a plurality of flat walls (54) extending in the front-rear direction are arranged in parallel in the vertical direction.

However, in such a structure, it is difficult to completely absorb the impact only by the bumper. Therefore, there is no danger that the impact often spreads to the surroundings. It was not a perfect structure.

SUMMARY OF THE INVENTION [0006] In view of the above-mentioned conventional problems, an object of the present invention is to provide a bumper that can be easily recycled and can exhibit high shock absorption.

[0007]

In order to achieve the above object, the present invention provides a shock absorbing wall which extends in the front-rear direction while being bent at least once in a wave shape before being deformed by an impact. One or more metal shock absorbers, and a metal reinforcement attached to the shock absorbers
And the shock absorbing portion and the reinforcing portion.
Is constituted as an extruded integral molded product .

In the present invention, the shock absorbing portion is preferably formed by extruding aluminum (including its alloy, the same applies hereinafter).

In the present invention, the reinforcing portion may be attached to the rear portion of the impact absorbing portion in a fused state, or may be connected to the rear portion of the impact absorbing portion. An embodiment attached to a certain embodiment is also one of preferred embodiments. In this case, the shock absorbing portion and the reinforcing portion are configured as an extruded integral molded product made of aluminum.
You.

[0010]

When an impact force acts on the bumper from the front, the impact force is applied to the impact absorbing wall, and the impact absorbing wall absorbs the impact by elasto-plastic deformation while buckling in the front-rear direction. As a result, very high shock absorption is exhibited.

[0011] In addition, since the reinforcing portion is attached, the impact is absorbed by the shock absorbing portion, and the ripple of deformation due to the impact is suppressed by the reinforcing portion.

[0012]

Next, an embodiment in which the embodiment of the present invention is applied to an automobile bumper will be described. The bumper according to the present invention is mainly used for automobiles, but is not limited to this, and can be widely applied to various structures that require shock absorption.

The entirety of the automobile bumper (1) shown in FIGS. 1 to 3 is constituted by a shock absorbing portion (2). (3)... Are shock absorbing walls, (4) is a front wall, and (5) is a rear wall.

As shown in FIG. 2, each of the shock absorbing walls (3) is extended in the front-rear direction while being refracted a plurality of times in the form of a triangular wave. It has been provided. It is needless to say that the term "bending" as an inventive concept is used to include refraction. A plurality of these shock absorbing walls (3) are arranged in parallel at predetermined intervals in the vertical direction. The front wall (4) and the rear wall (5) are connected on both front and rear sides.

The shock absorbing portion (2) is made of an extruded material made of aluminum. That is, the shock absorbing part (2)
It is manufactured by using an extruded material made of aluminum through a hollow die having a molding gap corresponding to the cross-sectional shape of the above. By adopting the processing method of extrusion in this way, it is possible to easily manufacture the shock absorbing portion (2) having the shock absorbing walls (3)...

Here, the cross-sectional size of the shock absorbing portion (2) depends on the type of the vehicle body to which the shock absorbing portion (2) is attached, but specifically, for example, both the lengths a and b are approximately 50.
It is set in the range of -200 mm. Further, as the aluminum material to be used, A6061 alloy, 6N61 alloy,
Aluminum alloy materials such as 6000 series and 7000 series such as A7003 alloy are suitable. In addition, each shock absorbing wall (3)
The number of wavy refracting parts (6) provided in the range of 1 to 50, and the height h between the upper refracting part (2) and the lower refracting part (2) in one shock absorbing wall (3). Is 2-75mm
And the number of the shock absorbing walls (3) is not limited to one, but is generally in a range of 2 to 20;
The refraction angle α in each refraction part (6) is 10 to 17
The thickness t of the shock absorbing walls (3).
It is preferable that the distance is set in the range of 0 to 5.0 mm.

The extruded material extruded as described above is formed into a bumper (1) by bending both ends thereof as shown in FIG. In this bending process, since each of the shock absorbing walls (3) is bent and extended in the front-rear direction for absorbing the shock as described above, the end portion can be easily bent without technical difficulty. In addition to being able to bend, the shape of the bent portion (7) can be formed into a bent portion (7) having excellent shape accuracy by utilizing the elasticity in the front-rear direction. Thus, it is possible to prevent undesired deformation from spreading to the surroundings.

Incidentally, the bumper (1) as described above is
Extrusion is performed using an extruded material made of an aluminum alloy equivalent to 6000 series or 7000 series, and the obtained extruded material is subjected to T1 treatment or T4 treatment, the end is bent, and further T5 or T6 treated. It is produced.

The surface of the obtained metal bumper (1) is desirably coated with hard urethane or styrene foam.

In the bumper (1) having the above structure,
As shown by arrows in FIG. 3, when an impact force acts on this from the front, each of the wavy impact absorbing walls (3) buckles in the front-rear direction and undergoes elasto-plastic deformation to absorb the impact, In addition to providing a high shock absorbing effect by suppressing the impact of the impact on other parts, the crushed state due to the impact is reduced to a non-extremely deformed state in which the front wall (4) retreats and approaches the rear wall (5).

A bumper (1) according to another embodiment shown in FIG. 4 has a structure in which a reinforcing portion (8) is continuously provided at a rear portion of an impact absorbing portion (2) having substantially the same structure as described above. Both are manufactured by integral extrusion of aluminum. In this case, the reinforcing portion (8) has a porous material structure in which the inside is partitioned by a horizontal partition wall (9) from the viewpoint of achieving further weight reduction and maintaining strength. As described above, by adopting the structure having the shock absorbing portion (2) and the reinforcing portion (8), the deformation ripple effect due to the impact can be suppressed by the reinforcing portion (2), and both of them can be recycled. Can contribute to the preservation of the global environment. Further, since the both are configured as extruded one KaradaNaru form thereof, it is possible to improve manufacturability produce bumper (1) with reinforcing section.

The sizes of the shock absorbing portion (2) and the reinforcing portion (8) are determined on a case-by-case basis in consideration of their functions, various technical matters, and the like.
As shown in FIG. 5, the reinforcing portion (8) may be designed to be smaller in size than the shock absorbing portion (2).

Also, as shown in FIG. 6, the reinforcing part (8) and the shock absorbing part (2) are extruded respectively,
These are formed on the facing side surface by the fitting unevenness (10).
(11) The structure may be integrated by fitting each other. Thus, a relatively soft aluminum material or the like excellent in shock absorption is used for the shock absorbing portion (2), and a hard aluminum material or the like having high strength is used for the reinforcing portion (8). Therefore, the configuration of the right person in the right place according to the function can be realized.

FIG. 7 shows a modified example of the shock absorbing portion (2), in which the shock absorbing walls (3) which are adjacent to each other in pairs vertically.
The refracting portions (6) and (6) on the opposing and near side of (3) are integrally connected to each other to form a lattice shape in appearance. By adopting such a configuration, it is possible to suppress undesired large buckling deformation of each of the shock absorbing walls (3)... Can be exhibited. In addition, such a special cross-sectional shape can also be easily formed by extrusion.

[0025]

As described above, according to the metal bumper of the present invention, there is provided a metal bumper in which one or a plurality of shock absorbing walls extending in the front-rear direction while being bent at least once in a wave shape are disposed in the vertical direction. Since it is provided with the absorbing portion, when an impact force acts, the impact energy is absorbed by the elasto-plastic deformation action of the absorbing wall, thereby exhibiting high impact absorption.

Moreover, since it is made of metal, it is easy to recycle and can contribute to global environmental conservation.

Further, since the bumper of the present invention has a metal reinforcing portion attached thereto, it is possible to suppress the spread of deformation due to an impact and to recycle both the shock absorbing portion and the reinforcing portion. And finally contribute to the preservation of the global environment.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of an automobile bumper according to one embodiment.

FIG. 2 is a cross-sectional view of the bumper.

FIG. 3 is a cross-sectional view showing a shock absorbing state of the bumper.

FIG. 4 is a cross-sectional view of a bumper according to another embodiment.

FIG. 5 is a cross-sectional view of a bumper according to a modification.

FIG. 6 is a cross-sectional view of a bumper according to another modification.

FIG. 7 is a cross-sectional view of a bumper according to still another modification.

FIG. 8 is a cross-sectional view of a conventional bumper.

FIG. 9 is a cross-sectional view of another conventional bumper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal bumper 2 ... Shock absorption part 3 ... Shock absorption wall 6 ... Refraction part 8 ... Reinforcement part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-293639 (JP, A) JP-A-4-2877741 (JP, A) JP-A-56-164853 (JP, U) JP-A-2-28 6659 (JP, U) Hikaru 1-77565 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60R 19/03 B60R 19/18

Claims (1)

(57) [Claims] 1. The state before being deformed by an impact
A metal shock absorbing portion in which one or more shock absorbing walls extending in the front-rear direction while being bent at least once in a wavy shape are arranged in a vertical direction, and a metal attached to the shock absorbing portion.
While having a reinforcing portion , the impact absorbing portion and the reinforcing portion are formed as an extruded integral molded product
A metal bumper characterized by being constituted .