JP2000104781A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent a reduction of a preventing characteristic of a bumper rubber under a high load by a simple means by attaching an annular body on an end periphery of a dust cover body. SOLUTION: A urethane rubber is used as a material of a bumper rubber 4 and a blend of NR(natural rubber) / EPDM(ethylene-propylene-dieneterpolymer) is used for a dust cover body 102, an end surface and a dust cover. An annular body 104 attached to the end surface is made of a stainless steel (18-8) and a band-like ring having a thickness of 2 mm and a width of 10 mm is press- fitted and engaged to the end surface. When press-fitting and engaging, a concave portion 105 matching to the thickness of the annular body 104 is formed on the end surface to stabilize the engagement. The device is evaluated by a load-deflection curve in a compression tester. As a result, even if a high load is applied thereto, an outstanding effect that a vibration-controlling characteristic can be maintained is exhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator integrated with a bumper rubber and a dust cover which is applied to a vehicle and other vibration isolators. The present invention relates to an anti-vibration device for preventing deterioration of characteristics.

[0002]

2. Description of the Related Art A vibration isolator integrated with a bumper rubber and a dust cover applied to a vehicle or other vibration isolator is already known. For example, in a shock absorber (1) in an automobile vibration isolator (A) as shown in FIG. 3, a flexible bumper rubber (4) is attached to a piston rod (3) extending from a cylinder (2), and the shock absorber (1) is mounted. In (1), when an axial load is applied, the shock is absorbed by elastic deformation, and when a sudden load is applied, the shock is averaged by a buffering action having a phase difference in the elastic deformation. In order to prevent foreign substances such as water and stones from entering the bumper rubber (4), the cylinder (2), the piston rod (3), and the like, the dust cover body (10)
It is covered with a dust cover (101) integrated with 2). The dust cover (10) integrated with the bumper rubber (4) and the dust cover main body (102).
1) has a structure fixed to the piston rod (3). A dish-shaped member (not shown) is attached to the lower part of the cylinder (2).
An upper sheet (5) is attached to the upper part of 2), and a spring (6) is attached between the dish-shaped member and the upper sheet (5). Dust cover (1
01) is formed in a bellows shape using an elastic body such as rubber so as to correspond to the vertical function of the cylinder (2), and can be extended and contracted. Then, the cylinder (2) moves up and down by the bounding and rebounding of wheels (not shown), and comes into contact with the bumper rubber (4) to dampen vibration.

In the above-described conventional vibration damping device, the bumper rubber (4), the dust cover main body (102), and the dust cover (101) are individually combined with each other, integrated, and attached. However, those in which the bumper rubber (4), the dust cover body (102) and the dust cover (101) are unitized by integral molding are also disclosed in Japanese Patent Application Nos. 9-334822 and 9-364.
No. 799, but the function is the same as the former.

[0004] In such a vibration isolator, however, no special problem occurs when a low load is applied.
When a high load is applied (X) as shown in (1), the end surface (103) of the dust cover main body (102) expands (Y), and the vibration isolation characteristics are significantly reduced. (A broken line in the image stabilization characteristic diagram of FIG. 2). That is, the bumper rubber (4) cannot withstand a high load and spreads outward, and the spread is directly received by the dust cover main body (102), and the end face (103) spreads in a chain, and the vibration damping characteristics deteriorate. To encourage.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to effectively and simply prevent the deterioration of the vibration-proofing properties of a bumper rubber under a high load. It is to provide a device.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a vibration damping device in which a dust cover is integrated so as to surround a bumper rubber in order to prevent a reduction in vibration damping characteristics under a high load. An annular body is fitted around the end of the cover body.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments. In the drawings, the same reference numerals as those in the conventional example are denoted by the same reference numerals as those in the conventional example.

FIG. 1 is a view showing an embodiment of a vibration isolator according to the present invention. The material of a bumper rubber (4) uses urethane rubber, and a dust cover main body (102), an end face (103) and The dust cover (101) used NR (natural rubber) / EPDM (ethylene propylene diene) blend rubber. The annular body (104) fitted to the end face (103) is made of stainless steel (188 steel), and a 2 mm-thick and 10 mm-wide band-shaped ring is pressed into the end face (103).
They are fitted. At the time of press fitting and fitting, the end face (10
3) The recess (105) corresponding to the thickness of the annular body (104)
In order to stabilize the fitting. When this vibration isolator was evaluated by a load-deflection curve using a compression tester, as shown by the solid line in FIG. 2, it was remarkable that the vibration isolator could be maintained even when a high load was applied. Effect.

In this embodiment, the urethane rubber is used for the bumper rubber (4). In addition to the urethane rubber, those generally used, for example, NR (natural rubber), SBR (styrene butadiene rubber), CR (chloroprene rubber), butyl rubber, NBR (acrylonitrile butadiene rubber), silicone rubber, fluorine rubber, halogenated butyl rubber, hydrogenated NBR, chlorosulfonated polyethylene, NR (natural rubber) / SBR (styrene butadiene rubber) blend rubber, and the like Polyolefin,
Those selected from thermoplastic elastomers such as polyester-based, polyether-based polyamide, and polyurethane-based can be used.

The dust cover main body (102), the end face (103) and the dust cover (101) are made of NR (natural rubber) / EPDM (ethylene propylene diene) blend rubber. IIR
(Butyl rubber), EPDM (ethylene propylene diene rubber), CR (chloroprene rubber), SBR (styrene butadiene rubber), NR (natural rubber), NBR (acrylonitrile butadiene rubber) and the like can be used.

As the annular body (104), a material having a higher tensile strength than the bumper rubber, for example, stainless steel, a metal such as iron and aluminum, and a synthetic resin such as a polycarbonate resin can be used. In the present embodiment, the annular body is constituted by a band-like body.
Any form such as a linear body may be used. In addition, the present invention can be applied to an anti-vibration device using a bumper rubber / dust cover integrally molded product.

[0012]

As is apparent from the detailed and concrete description, the vibration isolator according to the present invention has an excellent effect that the vibration isolating characteristics do not deteriorate even when a heavy load is applied.

[Brief description of the drawings]

FIG. 1 is a side view of a vibration isolator according to the present invention.

FIG. 2 is a diagram showing vibration isolation characteristics of the present invention and a conventional example.

FIG. 3 is a diagram showing a conventional example.

FIG. 4 is a diagram showing a spread under a high load in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shock absorber 2 Cylinder 3 Piston rod 4 Bumper rubber 5 Upper seat 6 Spring 101 Dust cover 102 Dust cover main body 103 End face 104 Ring body 105 Depression A Vibration isolator

Claims (1)

[Claims] 1. An anti-vibration device having a dust cover integrated so as to surround a bumper rubber, wherein an annular body is fitted around an end of a dust cover main body. Shaking device.