JPS6327226B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bumper for a vehicle. Some vehicle bumpers that are attached to the front and rear of an automobile include a bumper face made of synthetic resin that has ribs and a reinforcement that is attached to the inside of the bumper face. FIG. 1 is a perspective view of a conventional bumper of this kind, partially cut away and viewed from the back side. In the drawings, reference numeral 1 denotes a bumper face, which is formed in an elongated shape with a concave cross section, and is integrally formed of synthetic resin so that lattice-shaped ribs 2 rise from its inner wall. A reinforcement 3 is attached to the inside of the bumper face 1 so as to come into contact with the tip of the rib 2, and is made of a long metal plate molded product having a U-shaped cross section with the tip bent inward. A stay 4 is attached to the back side thereof.

In the above structure, the bumper face 1 is integrally molded by injection molding with the ribs 2 formed, and the reinforcement 3 made of a molded metal plate is engaged with the inside of the back surface of the bumper face 1, and the stay 4 Attached to the vehicle body. The bumper configured as described above is designed to reduce the weight of the vehicle and prevent damage to the bumper and the vehicle in a minor collision.In order to provide rigidity to the bumper face 1, reinforcing ribs 2 are integrated. It is formed as follows.

However, in such conventional vehicle bumpers, the ribs 2 are integrally molded on the inside of the bumper face 1, so when injection molding is performed, the ribs 2 on the front side of the bumper face 1 correspond to the ribs 2 on the front side of the bumper face 1. There was a problem that deformation such as sink marks occurred in the parts, and in the case of a bumper with high gloss due to painting etc., the appearance was spoiled. In order to improve these points, if the thickness of the bumper face 1 is increased,
As the amount of resin material used increased, the molding cycle became longer, and there was a problem in that the ribs 2 required for strength could not be formed despite the increased cost.

The present invention has been made in view of these problems, and aims to solve the above problems by integrally molding the ribs on the reinforcement.

This invention includes a bumper face made of synthetic resin,
A reinforcement installed on the inside of the bumper face, and ribs of different heights formed on one side through a through hole provided at a predetermined position of the reinforcement so as to face the inner wall of the bumper face. and a locking part integrally formed on the opposite side of the through hole so as to lock the rib to the reinforcement,
The bumper for a vehicle is characterized in that the ribs and the locking portions are integrally formed by injection molding through a through hole by inserting a reinforcement into an injection mold.

The present invention will be explained below based on the drawings. 2 to 5 show a bumper according to an embodiment of the present invention, in which FIG. 2 is a partially cutaway perspective view seen from the front, FIG. 3 is a sectional view taken along line A-A, and FIG. B
-B sectional view, FIG. 5 is a view in the C direction, and the first
The same reference numerals as in the figures indicate the same or corresponding parts.

The bumper face 1 is separated from the rib 2 and is made of a soft and highly elastic synthetic resin material and is formed into an elongated shape with a concave cross section. The ribs 2 are made of a rigid synthetic resin material and are formed into a lattice shape similar to that shown in FIG. It consists of vertical ribs 2b having a lower height, and is formed on one side, that is, the front side, of the reinforcement 3, facing the inner wall of the bumper face 1. The reinforcement 3 is made of a long metal plate molded product having a cross section with the tip bent inward, as shown in FIG. 1, and has a through hole 3a at a predetermined position. A locking portion 2c is integrally formed on the opposite side of the rib 2 through the hole 3a so as to connect the plurality of through holes 3a in a grid pattern. A stay 4 similar to that shown in FIG. 1 is attached to the back surface of the reinforcement 3, but it is omitted from the illustration. 5 is a screw that fixes the side surface of the bumper face 1 and the side surface of the reinforcement 3.

In the above configuration, the entire bumper face 1 can be molded by injection molding, but it is also possible to mold the elongated part by extrusion molding and form side protrusions at both cut ends by injection molding. In the latter case, the mold will be small. rib 2
Insert a part of the reinforcement 3 (front wall) into an injection mold, and by so-called outsert molding, the width direction rib 2a and the longitudinal direction rib 2b and the locking part 2c are integrated on both sides through the through hole 3a. Obtained by molding into. G indicates a gate portion.

Reinforcement 3 with integrated rib 2
into the inside of the bumper face 1, and with the width direction rib 2a of the rib 2 in contact with the inner wall of the bumper face 1 and the side surface of the reinforcement 3 in contact with the inner side surface of the bumper face 1, screw 5. , and attach it to the vehicle body using the stay 4. Since the rib 2 is locked to the reinforcement 3 by the locking part 2c, it is sufficient to simply insert it into the bumper face 1 and fix it, which simplifies the installation process and prevents the rib 2 from falling off. .

In the installed state, a light impact on the bumper face 1 is caused by the rib 2 and reinforcement 3.
It is transmitted to, absorbed and restored. At this time, the impact is first absorbed by the width direction ribs 2a, and if it is not absorbed by these, it is absorbed by the vertical direction ribs 2b, so that the impact is absorbed in two stages, and the impact absorption property is high. Since the bumper face 1 and the rib 2 are separated, the material, thickness, structure, etc. of each can be independently selected, and the strength of each can be adjusted.

FIG. 6 is a perspective view of another embodiment of the reinforcement seen from the back side, in which the locking portions 2c are connected to each through hole 3.
a are connected in an X-shape. In addition, there is no restriction on the shape of the locking portion 2c, and as long as the shape allows the rib 2 to be locked, the through holes 3a do not need to be connected to each other.

Note that the shape of the ribs 2 is not limited to a lattice shape, but may be a honeycomb shape or other shapes. Furthermore, the structure, materials, etc. of the bumper face 1, reinforcement 3, stay 4, etc. can also be changed.

As explained above, according to this invention,
In this structure, ribs and locking parts of different heights are integrally formed and locked on the reinforcement by injection molding, and are separated from the bumper face, so there is no possibility of sink marks etc. occurring on the bumper face surface. Therefore, the bumper face can be made thinner, the ribs can be made thicker to increase strength, and shock absorption and restorability can be improved, and installation workability can be improved and installation strength can be increased. Furthermore, the bumper face and ribs can be made of materials that are suitable for each, increasing the overall strength and reducing weight, resulting in significant cost reductions.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional bumper, partially cut away and seen from the back side. FIGS. 2 to 5 show a bumper according to an embodiment of the present invention, and FIG. 2 is a partially cut away perspective view. Perspective view from the front, Figure 3 is A-A
4 is a sectional view taken along line BB, FIG. 5 is a view taken in the direction of arrow C, and FIG. 6 is a perspective view of another embodiment of the reinforcement seen from the back side. In each figure, the same reference numerals indicate the same or equivalent parts; 1 is a bumper face, 2 is a rib, 2c is a locking portion, 3 is a reinforcement, 3a is a through hole, 4 is a stay, and 5 is a screw.

Claims (1)

[Scope of Claims] 1. A bumper face made of synthetic resin, a reinforcement attached to the inside of the bumper face, and a through-hole provided at a predetermined position of the reinforcement to one side of the bumper face. and a locking portion integrally formed on the opposite side of the through hole to lock the ribs to the reinforcement, A vehicle bumper characterized in that the ribs and the locking parts are integrally molded by injection molding through a through hole by inserting reinforcement into an injection mold. 2. The vehicle bumper according to claim 1, wherein the bumper face is molded from a soft and highly elastic material. 3. The vehicle bumper according to claim 1 or 2, wherein the rib is molded from a synthetic resin material having rigidity. 4. The vehicle bumper according to any one of claims 1 to 3, wherein the ribs have a lattice shape. 5. The vehicle bumper according to any one of claims 1 to 4, wherein the locking portion is formed to communicate the through holes.