JPH0769146A - Bumper reinforcement using pipes - Google Patents

Abstract

(57) [Summary] [Purpose] The shape of conventional bumper reinforcements tends to be complicated as a result of various conditions related to strength and weight. As a result, the assembly of the members becomes complicated, and for example, trial and error are inevitable at the design stage. Alternatively, there are inevitable disadvantages such as an increase in manufacturing cost. Therefore, the present invention provides a bumper reinforcing member produced by using pipes as a relatively simple member and bundling them or sandwiching them between thin plates. [Structure] A plurality of pipes are arranged side by side and fixed to an automobile body. Not only are they placed side by side, but there are also cases where the pipes are joined together by wire or welding, and then fixed to the vehicle body. It may also be sandwiched between thin plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper reinforcing material for automobiles and the like.

[0002]

2. Description of the Related Art The shape of a bumper reinforcing material that has been proposed hitherto tends to be complicated in order to satisfy various conditions relating to strength and weight. As a result, depending on the material and shape, the bumper reinforcing material can be manufactured as an integral body (Japanese Patent Laid-Open No. 4-146112, etc.), but in most cases, a plurality of members are assembled to manufacture this (special feature). Kaihei 2
The current situation is that of Japanese Patent No. 256539).

In a bumper reinforcement made by assembling members, the shape of the member is relatively complicated. In some parts, pipes or primary processed products having closed cross sections are used as members (Japanese Patent Laid-Open Nos. 1-67166 and 3-522).
63, JP-A-4-26153, JP-A-4-218446.
However, in most cases, a thin plate that has been subjected to secondary processing such as pressing, bending and cutting is used as a member.

[0004]

When a bumper reinforcement is manufactured by assembling a member having a complicated shape or a large number of members as described above, not only the process becomes complicated and the manufacturing cost increases, but also the design At the stage, it becomes difficult to predict the strength of the bumper reinforcement, and many trials and errors are unavoidable. As a result, it is expected that not only will it take a long time and a lot of labor to develop the product, but not only the price of the product will increase, but also the same trial and error will be required in improving the product.

In order to avoid the above facts, it is necessary to use a relatively small number of relatively simple members and assemble them to form a reinforcing material. The present invention has been made to meet such a demand, and an object of the present invention is to provide a bumper reinforcing material having sufficient strength by an extremely simple process.

[0006]

Therefore, in the present invention, the bumper reinforcing member is manufactured by using tubes as members and simply arranging them side by side, bundling them by a simple method, or sandwiching them by a thin plate. That is, the gist of the present invention is as follows.

(1) A bumper reinforcing member formed by arranging a plurality of pipes in parallel and fixing them. (2) A bumper reinforcing member formed by fixing a bundle of a plurality of pipes. (3) It is made by fixing a plurality of pipes joined together.
The bumper reinforcing material according to (1) or (2). (4) The bumper reinforcing member according to (3), wherein a plurality of pipes are juxtaposed and sandwiched and fixed by a set of two thin plates.

Specific points of this bumper reinforcing material will be described below. The pipe used as a member is, for example, a square steel pipe or an aluminum extruded pipe, and does not require secondary processing. -The material of the tube and the thin plate used as the member does not matter whether they are used alone or in combination. -Use the tubes separated from each other or in contact with each other. In some cases, they may come in contact with each other in a bundle. The means for bundling the tubes is a simple process such as band tightening or bolting. The means for joining the pipe and the thin plate are welding, such as laser welding, bolting, and bonding. -After bundling the tubes, they may be easily processed and finished as a reinforcing material.

This bumper reinforcing material is expected to be reduced in price by simplifying the process. In addition, since it is possible to simply predict the reinforcing characteristics of the entire bumper reinforcing member based on the characteristic data of the pipe to be used, it is considered that the examination at the time of design will be easy and accurate. Furthermore, a complicated shape can be produced for a simple process.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a bumper reinforcing member in which two square tubes 1 of the same shape made of high-tensile steel of 60k are arranged apart from each other (corresponding to claim 1).
Is shown. Square tube 1 has a rectangular cross section, and the width and width are 60 x
It has a thickness of 40 mm and a wall thickness of 1.3 mm. Both ends of each of the two tubes are bent to R = 3.0 m. The bolt holes 2 are preliminarily formed at predetermined positions of each rectangular tube for mounting on the vehicle body. By using a relatively low-strength steel material for the square tube, the entire bumper reinforcement is deformed against the load applied to the reinforcement.

FIG. 2 is a bumper reinforcing member made by arranging two square tubes of the same shape made of 60k high-strength steel and winding them by winding a wire 3 made of 120k high-strength steel (claim 2).
(Corresponding to). The square tube has a square cross section, a width of 50 mm and a wall thickness of 1.3 mm. The cross-sectional shape of the wire is a perfect circle with a diameter of 0.4 mm. It is not processed after bundling. For attachment to the vehicle body, bolt holes 8 are opened at predetermined positions of each square tube before bundling. By using a relatively high-strength steel material for the wire, the tubes after bundling do not scatter.

In FIG. 3, two square tubes of two different types made of 60k high-tensile steel, two in total, are bundled by winding a wire 3 made of 120k high-tensile steel with a small diameter side in between. Bumper reinforcement made by (corresponding to claim 2)
Is shown. The two types of square tubes have a square cross section with a width of 20 mm and a rectangular cross section with a vertical and horizontal width of 20 mm × 40 mm, and have wall thicknesses of 0.7 and 1.0 mm, respectively. The cross-sectional shape of the wire is a perfect circle with a diameter of 0.4 mm. It is not processed after bundling. For attachment to the vehicle body, bolt holes 8 are opened at predetermined positions of predetermined square tubes before bundling. By using pipes with different cross sections together, more flexible bumper reinforcement cross sections can be designed.

In FIG. 4, two square tubes of the same shape made of 80k high-strength steel, two square tubes of the same shape made of 100k high-tensile steel, and a total of four square tubes are arranged in a square shape. Shows a bumper reinforcement member (corresponding to claim 3) produced by bundling by arc welding. These may be fixed by the wire 3. The four square tubes have a square cross section and a width of 40 mm.
And the wall thickness is 0.7 mm. Welding is first performed on the upper and lower sides, and then they are joined together. It is not processed after bundling. For attachment to the vehicle body, bolt holes 8 are opened at predetermined positions of predetermined square tubes before bundling. The reason for using a steel material that is harder than the inner two tubes for the two outer rectangular tubes is that local deformation of the outer rectangular tube is suppressed against impact force, and the impact energy is absorbed by the entire inner rectangular tube. It is because I am expecting.

FIG. 5 is a bumper reinforcing member manufactured by using three round tubes of the same shape made of 80k high-strength steel in a triangular shape and winding them by winding a wire 3 made of 120k high-tensile steel (claim 2). (Corresponding to). The round tube has an outer diameter and a wall thickness of 48 mm and 0.7 mm, respectively. The cross-sectional shape of the wire is a square having a side of 0.4 mm. After bundling, both ends are bent to R = 3.0 m. For attachment to the vehicle body, bolt holes 8 are opened at predetermined positions of predetermined round rectangular tubes before bundling.

FIG. 6 shows an example of a bumper reinforcing member (corresponding to claim 4) made by assembling two square tubes of the same shape made of 80k high-strength steel together with two thin plates of the same steel. There is. The rectangular tube 7 has a width of 40 mm and a wall thickness of 1.0 mm. The thin plates 5 and 6 are 90 mm wide and 70 m wide.
m, wall thickness 0.7 mm. The assembly is done by laser welding (9 shows the weld) and is not processed after assembly. A screw hole 8 is provided in advance at a predetermined position of a predetermined member for attachment to the vehicle body.

It is known that the bumper reinforcement having the "eye-shaped" cross section as shown in FIG. 6 has excellent strength in terms of material mechanics, but conventionally, an appropriate method for producing this shape from steel has been considered. There wasn't. This example is considered to be a good example of relatively simple manufacture of a steel bumper reinforcement having an "eye" cross section.

FIG. 7 shows two 7000 series aluminum extrusion members 7A having the same shape, and a thin plate 5 made of 80k high tension.
The example of the bumper reinforcement material (corresponding to claim 4) produced by assembling with two sheets A and 6A is shown. The cross-sectional shape of the extruded material made of aluminum is also shown in FIG. The thin plate has a width of 90 mm and a wall thickness of 0.7 mm. The assembly is screwed and is not processed after assembly. A screw hole 8 is provided in advance at a predetermined position of a predetermined member for attachment to the vehicle body.

Generally, a trapezoidal structure cross section as shown in FIG.
It is known that it has a high yield strength against a load from above.
However, conventionally, no suitable method for producing this shape has been considered. In this example, the strength characteristics of steel and the trapezoidal cross-sectional shape of alumina are effective for the tensile stress in the longitudinal direction of the reinforcing material and the stress that contributes to the cross-sectional deformation, which are generated by the load from above.

FIG. 8 is a bumper reinforcing member produced by assembling two round tubes 7B of the same shape made of 80k high-strength steel together with two thin plates 5B and 6B of the same steel (corresponding to claim 4). ) Is shown. The outer diameter of the round pipe is 30mm,
The wall thickness is 1.3 mm. The width of the thin plate is 70m.
m, wall thickness 1.0 mm. Laser welding 9
And after assembly, bending is performed with R = 3.0 m. A screw hole 8 is provided in advance at a predetermined position of a predetermined member for attachment to the vehicle body. This cross-sectional shape is similar to the "eye" shape like that of FIG. 6, and it is easy to give a curved shape to the reinforcing material as a whole.

[0020]

As described above, the bumper reinforcing member manufactured as an assembly of pipes has a greatly simplified manufacturing process as compared with the conventional one. Moreover, this is not only easy to manufacture by properly combining different materials or different shapes of pipes, and not only can accurate and diverse studies be made at the design stage,
It can be expected that it will be easy to meet the various needs that are expected in the future.

In each of the above-mentioned examples, the one corresponding to claim 4 is manufactured by combining the load-bearing portions in place of the ribs with a simple cross section by using a pipe and a thin plate together. It is considered advantageous in future product development that the thickness of each side of the cross section can be freely selected and that different materials can be used together more freely than in the past.

[Brief description of drawings]

FIG. 1 shows an example of a bumper reinforcement in which two rectangular tubes of the same material and the same shape are arranged.

FIG. 2 shows an example of a bumper reinforcement made by arranging two rectangular tubes of the same material and the same shape and bundling them with a wire.

[Fig. 3] Using square tubes of the same material but with different cross-sections,
An example of a bumper reinforcing material produced by bundling with wires will be shown.

FIG. 4 shows an example of a bumper reinforcing member produced by bundling by welding, using square tubes of different materials and having the same shape together.

FIG. 5 shows an example of a bumper reinforcement made by using three round tubes of the same material and the same shape in a triangular shape and bundling them with a wire.

FIG. 6 shows an example of a bumper reinforcement member formed by welding using a rectangular tube and a thin plate made of the same material.

FIG. 7 shows an example of a bumper reinforcement member assembled by long bolts using a square tube and a thin plate made of different materials.

FIG. 8 shows an example of a bumper reinforcement member formed by welding using a round tube and a thin plate made of the same material.

[Explanation of symbols]

 1 Pipe 2 Bolt hole for mounting on automobile body 3 Wire 5 Top plate 6 Base plate 7 Intermediate pipe member 8 Bolt hole 9 Welding location

Claims (4)

[Claims] 1. A bumper reinforcement member comprising a plurality of pipes arranged side by side and fixed. 2. A bumper reinforcing member formed by fixing a bundle of a plurality of pipes. 3. The bumper reinforcing member according to claim 1, which is formed by fixing a plurality of pipes joined to each other. 4. The bumper reinforcing member according to claim 3, wherein a plurality of pipes are juxtaposed and sandwiched and fixed by a set of two thin plates.