JPH041385Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a reinforced bump stopper used in an automobile shock absorber or the like.

[Conventional technology]

Conventionally, the seating surfaces of the upper support and spring seat that come into contact with the bump stopper have been flat without any level difference. However, in recent years, upper supports having a step in the contact surface with the bump stopper have come into use.

[Problem that the invention attempts to solve]

In the case of a contact surface with a step as described above, when the bump stopper's cushioning rubber is repeatedly compressed, a gap between the part of the cushioning rubber that is in contact with the smooth surface and the part that contacts the recess of the step part is generated. A significant difference in compression ratio occurs, and by repeating such uneven compression, cracks 10 as shown in Fig. 2 occur in the area where the smooth surface of the cushioning rubber contacts the interface between the recess and the durability deteriorates. sex is significantly reduced. In order to solve these problems, it is not enough to simply improve the shape of the bump stopper; it is necessary to strengthen the material itself.

[Means for solving the problem] and [Operation] The structure of the present invention is that the bump stopper is attached to the upper support having a step, or the portion that contacts the damper seating surface and the bump stopper attached to the damper seating surface only during compression. In a bump stopper having a contact area, a reinforcing material made of nonwoven fabric, fabric, or fiber aggregate is placed on the surface of the bump stopper at the contact area with the step start part or the area that contacts the damper seating surface only during compression. It is characterized by being buried nearby and molded as one piece.

This invention effectively prevents the occurrence of cracks by embedding a reinforcing material such as non-woven fabric in areas where cracks are likely to occur during repeated compression of the bump stopper, or by integrally molding or baking the cushioning rubber material itself. It is something to do.

The part of the bump stopper that tends to crack is the part on the side that contacts the upper support, where the smooth surface ends and the bump begins.
Also, only when the bump stopper is compressed, is the surface that comes into contact with the seat surface of the damper and its surrounding area.

Examples of the reinforcing material in the present invention include nonwoven fabrics, fabrics, fiber aggregates, etc. Among them, nonwoven fabrics made of synthetic fibers such as nylon and polyester are preferred.

[Embodiment 1] FIG. 1 is a sectional view of a bump stopper according to the present invention. 1 is a bump stopper made of cushioning rubber, 2 is a contact surface of the upper support with the bump stopper, and in this embodiment, a step 3 is provided near the center. Therefore, on the upper surface of the bump stopper 1, there is an upper support contact portion 4 that contacts the smooth surface of the contact surface 2, and a peripheral portion 5 thereof, that is, a portion that does not contact the upper support due to the step 3. I can do that. Reference numeral 6 denotes a reinforcing material, which is made of a 6-nylon nonwoven fabric having a thickness of about 4 mm and baked over the upper support contacting part 4 and the step corresponding part 5 of this bump stopper. 7 is the rod and 8 is the seat surface of the damper.

Using this bump stopper, compression was repeated 500,000 times with a load of 485 kg, but no abnormalities were found. On the other hand, when we conducted the same experiment using the same bump stopper except that no reinforcing material was used, we found that after 10,000 to 20,000 repetitions, the upper support contact portion 4 was damaged as shown in Figure 2. A crack 10 occurred at the boundary with the step corresponding part 5.

In this embodiment, a 6-nylon nonwoven fabric was used as the reinforcing material, but other synthetic fibers such as polyester, or nonwoven fabrics, woven fabrics, fiber aggregates, etc. made of natural materials may be used as the reinforcing material.

[Example 2] The same 6-nylon nonwoven fabric as in Example 1 was
As shown in the figure, the bearing surface 8 of the damper only during compression,
In particular, it was integrally molded and embedded in the surface 9 that contacts the edge portion. Although this area was prone to cracking due to the cushioning of the damper's seat surface, an experiment similar to that in Example 1 was conducted and no abnormalities were found.

〔effect〕

According to the present invention, even if the mounting structure of the bump stopper impairs the durability of the bump stopper, the abrasion resistance and tear strength can be improved to ensure sufficient durability. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view showing a state in which cracks have occurred in the prior art. In the drawing, reference numeral 1 indicates the bump stopper, 2 indicates the contact surface of the upper support with the bump stopper, and 3
is a step, 4 is an upper support contact portion, 5 is a step corresponding portion, 6 is a reinforcing portion, 8 is a bearing surface of the damper, 9 is a surface that contacts the bearing surface 8 of the damper only during compression, 10
is a crack.

Claims (1)

[Scope of utility model registration request] In a bump stopper attached to a top support with a step, or in a bump stopper that has a part that contacts the damper seating surface and a part that contacts the damper seating surface only during compression, the bump stopper has a step. At the point of contact with the starting part or the point of contact with the bearing surface of the damper only during compression,
A reinforcing bump stopper in which a reinforcing material made of nonwoven fabric, fabric, or fiber aggregate is embedded near the surface and integrally molded.