JPS6141775B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elastic bumper for an automobile, and more particularly to an automobile bumper made of rubber or synthetic resin in which a metal support having a mounting portion to the vehicle body is integrally embedded, and a method for manufacturing the same.

In this invention, the term "elastic bumper" refers to a rubber or synthetic resin elastic molded product that is installed on the entire front or rear surface of a vehicle, or at a corner. It is attached to a bracket, and in the case of a partial bumper such as a corner portion, it is covered and attached to the main part of the bumper on the vehicle body side.

In recent years, from the standpoint of safety, elastic bumpers (here corner bumpers) made of soft synthetic resin, etc., as shown in Fig. 1, have been installed on both corners of a metal bumper body as bumpers for automobiles. ing. Conventionally, the mounting structure for this type of elastic bumper is as shown in FIG.
Generally, bolts 54 protruding from the bumper main body 51 are inserted into the mounting holes 21 of the bumper main body 20 on the vehicle body side and screwed onto nuts 22 to fix the bumper main body 51.
In order to prevent local distortion during the installation of the elastic bumper 50 and to increase shock mitigation due to deformation of the elastic bumper, a mounting portion 52 is provided protruding from the metal support 53 as shown in the figure, and the mounting bolts 54 are provided. The elastic bumper main body 51 and the bumper main body 2 are
0, a space S is provided between the two.

However, in the conventional bumper structure described above, the metal mounting portion 52 with the mounting bolt 54 fixedly attached to the metal support body 53 is protruded by welding or the like, so it has the following drawbacks. Was.

That is, first, the first metal support 53 and the metal attachment part 52 are formed by forming a metal plate into a predetermined shape by press molding or the like, and then welding it at a predetermined position. Variations in molding, slight misalignment when welding the two, and variation when fixing the mounting bolts often cause the positional relationship of the mounting bolts to be out of alignment, which significantly impedes the efficiency of this work. ing. Second, when the bumper body is integrally molded using a mold using the above-mentioned metal portion as an insert, the portion 53a of the metal support 53 provided with the metal mounting portion 52 becomes a floating portion within the cavity of the mold. However, there is a risk that deformation may occur due to the injection pressure during injection of raw materials. For this purpose, the portion 53 of the metal support 53
Although a small hole 55 is made in the hole 55 so that the raw material can pass into the attachment part 52, there is still a risk of deformation in this case as well. Thirdly, since the metal mounting portion 52 is assembled to the metal support 53, there is a drawback that the total weight of the bumper 50 itself becomes heavy, and the number of man-hours required for each molding process, assembly, etc. is uneconomical. There are also aspects.

The present invention aims to provide an elastic bumper for automobiles that improves the above-mentioned drawbacks and a method for manufacturing the same, and details thereof will be explained below.

FIG. 1 shows a perspective view of an elastic bumper (corner bumper) 10 showing one embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view showing the bumper 10 mounted on a bumper main body 20. The elastic bumper 10 for an automobile according to the present invention is an automobile bumper made of rubber or synthetic resin, in which a metal support having an attachment portion to a vehicle body side member is integrally formed on the back surface of the bumper body. The metal support and the bumper body are integrally formed with a part recessed toward the vehicle body to form a mounting recess, and a filler having substantially the same shape as the recess is inserted into the recess. It is characterized by the fact that
That is, as shown in the figure, in this elastic bumper 10 for an automobile, a metal support 13 is embedded integrally on the back side of a bumper body 11 made of an elastic body of rubber or synthetic resin. The metal support 13 is made of a single plate having almost the same shape as the bumper body 11, and has mounting bolts 15 at predetermined positions on the support 13.
A recess 13a on the vehicle body side for fixing the
13a... are formed. A mounting bolt 15 protrudes outward from the inner bottom surface of the recess 13a, and above the head of the bolt 15, the recess 13a
A filling 12 having substantially the same shape as the shape a is inserted. The filling 12 is preferably made of a material that is the same as or compatible with the rubber or synthetic resin that constitutes the bumper body 11. The filling 12 is molded integrally with the bumper body 11.

To explain the method of manufacturing an elastic bumper for an automobile according to the present invention, FIG. 3 shows a sectional view of a molding die 30 for the bumper body 11, and FIG. 4 shows a molded product immediately after molding. Cavity 31 of this molding die 30
The metal support body 13 and the mounting bolt 15 to be used as the insert can be fixed to the device. Then, the filling 12 is fitted into the recess 13a of the metal support 13. When inserting the filler 12, if necessary, it may be fixed to the bottom of the recess 13a with adhesive or double-sided adhesive tape, or a protrusion or the like may be provided in the recess of the metal support 13 and the filler 12 may be press-fitted. It's okay. Here, the filling 12 is simultaneously molded using the same raw material in the same mold as the molding mold 30 for the elastic bumper body 11. That is, by connecting the runner 34 connected to the filling molding cavity 35 to the runner 33 of the molding die 30 of the bumper body, a molded product of the filling 12 can be obtained at the same time as the bumper body 11 is molded. If the thus obtained molded stuffing 12 is sequentially inserted into the recess 13a of the metal support 13 and integrally molded when molding the bumper body from next time onwards, the bumper can be molded extremely efficiently. becomes possible.

In the above embodiment, a so-called corner bumper attached to each corner of a metal bumper body was described, but the same applies to a full-face (single) bumper.

As described above, in the elastic bumper for automobiles according to the present invention, there is no need to weld the metal attachment part to the metal support as in the conventional case, and the recess is formed directly in the metal support to serve as the attachment part. Firstly, the above-mentioned error factors in positional relationships are removed, making it possible to quickly obtain dimensionally accurate products.Secondly, the weight is reduced, and thirdly, work is simplified by simplifying the work process. It is possible to significantly improve efficiency and save raw materials. In addition, since the bumper body is integrally molded with a filler inserted into the recess of the metal support, the inner thickness of the bumper body is almost constant.
There is no fear of sink marks on the surface. Furthermore, in the method for manufacturing an automobile bumper according to the present invention, since the filling material is molded from the same material as the bumper body and in the same mold at the same time, the compatibility between the filling material and the bumper body is improved. This not only ensures the safety of the user, but also greatly simplifies the work process, making it possible to proceed with work extremely efficiently.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an elastic bumper for an automobile according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the bumper attached to a bumper body, and FIG. 3 is an elastic bumper for an automobile according to an embodiment of the present invention. FIG. 4 is a perspective view of a molded product immediately after molding, and FIG. 5 is a longitudinal sectional view showing a conventional elastic bumper mounted on the bumper main body. 10...Elastic bumper, 11...Bumper body, 1
2...Filling, 13...Metal support, 13a...Recess, 15...Mounting bolt, 20...Bumper main body,
30... Mold, 31, 35... Cavity.

Claims (1)

[Scope of Claims] 1. A bumper for an automobile made of rubber or synthetic resin, in which a metal support having an attachment portion to a vehicle body side member is integrally formed on the back surface of a bumper body, wherein a part of the metal support is integrally formed on the back surface of a bumper body. The metal support and the bumper body are integrally formed with a mounting recess formed on the vehicle body side, and a filler having substantially the same shape as the recess is inserted into the recess. An elastic bumper for automobiles featuring: 2. In a method for manufacturing a rubber or synthetic resin automobile bumper in which a metal support having a mounting recess is integrally embedded, a filler having substantially the same shape as the mounting recess is molded at the same time as the bumper body is molded;
A method for manufacturing an elastic bumper for an automobile, characterized in that the filler is sequentially inserted into the recesses of the metal support and integrally molded during subsequent molding of the bumper main body.