JPS6225401Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an energy-absorbing urethane bumper that is easy to manufacture and strong, and particularly to a reinforcement structure thereof.

In energy-absorbing bumpers, steel reinforcements with a closed cross-section structure have traditionally been used to back up energy-absorbing members, but due to the need to reduce vehicle weight, fiber-reinforced synthetic resin (FRP)
Reinforcement made by pultrusion molding of 3D materials (called ``reinforcement materials'') has started to attract attention.

By the way, both end portions of an automobile bumper need to be curved so that they can cope with collisions with obstacles from the side or diagonally. In the case of conventional steel reinforcement, the end can be easily formed into a curved shape by press working, but it is possible to easily form the end into a curved surface shape by pressing, but it is possible to form a long rough material made of FRP into a closed cross-sectional structure by pultrusion to a predetermined length in the drawing direction. In a urethane bumper using reinforcement cut in the orthogonal direction, it is difficult to form both end surfaces of the reinforcement into curved shapes. Furthermore, since the ends and corners of the reinforcement were wedged into the urethane foam, there was a problem in that cracks occurred in those portions of the foam. Therefore, as one of the conventional processing methods, as shown in Fig. 5, the front corner of the end of the reinforcement 1 is cut off diagonally, and a plate material 5 such as a sheet molding compound is bonded to this slope It was pasted with an adhesive to strengthen the terminal part and protect the urethane foam.

However, this method requires two steps, cutting off the material and attaching the plate material, and also requires a lot of time to dispose of the cut-off waste material.

Therefore, the purpose of the present invention is to provide a bumper structure in which the reinforcement terminal of an FRP pultruded product with good productivity is strengthened by a simple means. The above purpose can be achieved by attaching a corner piece with a cap shape with a curved outer surface and peripheral ribs to both end faces of a vertically cut FRP reinforcement, and using the ribs to cap the end opening. The goal is to achieve the following.

The present invention will be explained below with reference to the embodiments shown in FIGS. 1 to 4.

Reinforcement 1 is an FRP pultrusion molded product, which has a constant cross-sectional shape and is cut into a predetermined size in the drawing direction from a rough material having a straight line or a gentle arc shape. In the illustrated example, the cross-sectional shape is a Japanese character-shaped closed cross-section, but it is not limited to this.
For example, the composition of FRP material is glass fiber.
A unidirectional glass roving is mainly used at 60 to 80% by weight, and unsaturated polyester, epoxy, vinyl ester resin, etc. are used as the matrix resin.

Corner piece 2 is made of high-strength plastic material such as sheet molding compound or glass fiber reinforced nylon, and is cap-shaped with a curved outer surface, and the opening is reinforcement 1.
It has almost the same shape as the terminal opening. The opening of the corner piece 2 has a front part 1a, a rear part 1b, an upper part 1c, and a lower part 1d of the reinforcement 1.
a rib 2a that is inscribed and fitted into the opening consisting of;
2b, 2c, and 2d protrude in a mouth shape, and a rib 2e extending from the outer surface portion 21 is formed at a portion that abuts the opening edge of the front surface portion 1a of the reinforcement 1. Rib 2e and the above rib 2a
A groove 22 is formed between the groove 22 and the opening end edge of the front face portion 1a of the reinforcement 1. Although the outer surface of the corner piece 2 has a curved shape, the specific shape is not particularly limited.
Any material that does not collide at an acute angle with obstacles from diagonal directions is sufficient.

Thus, the corner piece 2 is inserted between the ribs 2b and 2e while the opening edge of the reinforcement front part 1a is inserted between the ribs 2a and 2e.
c and 2d are press-fitted into the terminal opening of the reinforcement 1 and covered with the reinforcement 1.
At this time, there is no need to use adhesive, and it is firmly attached by simply fitting it in with one touch. The front and front half of the side surfaces of the reinforcement 1 and the corner piece 2 are covered with an energy absorbing member 3, and the outer surface thereof is covered with a cover member 4 made of an elastic elastomer, thereby forming an energy absorbing bumper.

As described above, in the bumper of the present invention, the corner pieces 2 are crowned on both end surfaces of the reinforcement 1, resulting in a box-like shape and high rigidity. Since it abuts from the collision side of the opening, that is, from the front, it can sufficiently withstand the collision against the corner piece 2. Furthermore, although the corner piece 2 was only fitted with one touch without using adhesive, each rib firmly abuts the inner surface of the end opening of the reinforcement 1 and is wrapped in the energy absorbing member 3. Even if a torsional load is applied to the end portion of the reinforcement 1, there is no fear that the corner piece 2 will fall off. Further, since there is no need for a diagonal cutting process or a gluing process for the end of the reinforcement 1, manufacturing is simple, and no waste material is generated and it does not take much time to dispose of it.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, in which FIG. 1 is a perspective view of the reinforcement end portion to which the corner piece is attached, and FIG.
FIG. 3 is a sectional view taken along the line - in FIG. 1, FIG. 4 is a sectional view of the end of the bumper in an assembled state, and FIG. 5 is an example of a conventional reinforcement terminal treatment structure. shows. 1... Reinforcement, 2... Corner piece, 2a, 2b, 2c, 2d, 2e... Corner piece rib, 3... Energy absorbing member,
4...Bumper cover.

Claims (1)

[Scope of utility model registration request] In an energy-absorbing bumper, the outer surface of reinforcement made of drawn material made of fiber-reinforced synthetic resin is covered with an energy-absorbing member, and the outer surface of the reinforcement is covered with a bumper cover made of elastic elastomer, which is attached to the front and rear of an automobile. A cap-shaped corner piece with a curved outer surface and ribs on the periphery is placed over the openings at both ends cut in a direction perpendicular to the pulling direction of the reinforcement, and is fitted with the ribs. An automobile bumper structure characterized by the fact that it is worn.