JPH0510362A - Vibration-proof bush - Google Patents

Abstract

PURPOSE:To secure the durability of a vibration-proof rubber body without applying drawing and facilitate the adjustment of the stopper clearance. CONSTITUTION:A bracket 1 is molded with a metal plate body into a U-shape, and both ends of a vibration-proof rubber body 3 are connected between mating side walls 1a, 1b. The stress in the vibration-proof rubber body 3 is converted into compression from tension when the metal plate body is molded, and the durability is improved. Stopper rubber bodies 32, 33 protruded nearer to each other at the tips respectively are provided on the mating side walls 1a, 1b of the bracket opening. A backup plate 4 has a projection 41 bent and protruded by the preset quantity into the bracket 1, and both stopper rubber bodies 32, 33 are thrust into the bracket 1 by the projection 41 and are located face to face at a preset interval with the side face 3b of the vibration-proof rubber body 3. When the protruded quantity of the backup plate 4 is changed, the stopper clearance d2 can be easily adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration bush, and more particularly to an anti-vibration bush which is easy to manufacture and whose stopper clearance is easily adjusted.

[0002]

2. Description of the Related Art In a conventional vibration-proof bush, a vibration-proof rubber body 3 is provided across a circular outer cylinder 6 as shown in FIG. 4, and an inner cylinder 2 is embedded at the center of the vibration-proof rubber body 3. It has a structure. Then, the upper and lower side surfaces 3a, 3b of the anti-vibration rubber body 3
Stop rubber layers 61, 62 are provided on the inner peripheral surface of the outer cylinder 6 facing the
Is formed to form a constant stopper clearance,
Excessive deformation of the anti-vibration rubber body 3 at the time of large vibration input is regulated.

The anti-vibration bush is press-fitted and fixed in the tubular holding portion 71 of the bracket 7 shown in FIG. 5, and the bracket 7 is fixed to a vehicle frame or the like. The engine and the like are connected to the inner cylinder 2.

[0004]

By the way, in the above-mentioned conventional vibration-proof bush, when the vibration-proof rubber body 3 is injection-molded in the outer cylinder 6, a tensile stress is generated in the rubber body and the durability during use is deteriorated. Therefore, prior to press-fitting into the bracket 7, the outer cylinder 6 is reduced in diameter to perform a drawing process for converting the stress in the vibration-proof rubber body 3 into compression. However, this drawing process requires large-scale equipment, which causes an increase in manufacturing cost.

Further, the adjustment of the stopper clearance has a problem that the degree of freedom is small because the shape of the outer cylinder 6 is restricted and the stopper clearance cannot be commonly used for various vehicle types.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a vibration-proof bush capable of reducing the cost by eliminating the drawing process and enabling the stopper clearance to be easily adjusted.

[0007]

The structure of the present invention will be described. A metal plate is formed into a U-shape to form a bracket 1, and a vibration-proof rubber body 3 is provided between opposing side walls 1a and 1b of the bracket 1. Both ends of the bracket 1 are joined to each other and an inner cylinder 2 is provided in the anti-vibration rubber body 3 so as to penetrate therethrough.
A stopper rubber layer 31 is formed on the inner peripheral surface of the curved top part of the anti-vibration rubber body 3 so as to oppose the one side surface 3a of the anti-vibration rubber body 3 at a predetermined interval. Are provided with stopper rubber bodies 32 and 33 whose tips are close to each other, and the bracket opening has a protrusion 41 which protrudes into the bracket 1 by a predetermined amount.
Are pushed into the bracket 1 and these are attached to the above-mentioned anti-vibration rubber body 3
The other side surface 3b is covered and fixed with a backup plate 4 which is opposed to the other side surface 3b at a predetermined interval.

In the vibration-proof bush having the above structure, the opposing side wall 1 is formed in a state where the bracket 1 is formed in a slightly open U shape.
The anti-vibration rubber body 3 is formed between a and 1b, and the opposite side walls 1a and 1b are formed.
When the interval is narrowed so that b is parallel to form a final U-shape, the vibration-proof rubber body 3 is deformed by compression, and the internal stress is converted from tension to compression. As a result, the durability of the anti-vibration rubber body 3 is improved without performing the drawing process.

When the static load of the vibrating body is received, the inner cylinder 2 moves relative to the bracket 1, and the stopper clearance d1 between the one side surface 3a of the vibration isolating rubber body 3 and the stopper rubber layer 31 fluctuates. In this case, the backup plate protrusion 41
The stopper clearance d2 between the anti-vibration rubber body 3 and the other side surface 3b of the anti-vibration rubber body 3 is adjusted by appropriately adjusting the amount of protrusion of the anti-vibration rubber body 32 and 33 and pushing both stopper rubber bodies 32, 33 into the required amount of bracket 1.
Can be made approximately the same as the stopper clearance d1.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, the vibration-proof bush is U
A bracket 1 formed in a letter shape, and the bracket 1
Is a metal plate body having a constant width that is curvedly formed, and the opening is bent outwardly on both sides to form a mounting flange 11. Also,
On the top surface of the bracket 1, a dynamic damper in which a mass body 52 is joined by a rubber layer 51 is provided.

A rubber material is injection-molded in the bracket 1, and both ends thereof are joined to the bracket side walls 1a and 1b facing each other in parallel, so that the vibration-proof rubber body 3 has a stopper rubber layer 31 on the curved inner peripheral surface of the top portion. Is formed, and stopper bodies 32 and 33 extending in the facing direction are formed from the facing surfaces of the side walls 1a and 1b of the bracket opening, respectively. The ends of both stopper bodies 32 and 33 closely face each other, and the anti-vibration rubber body 3
An inner cylinder 2 is embedded in the center of the through hole.

When molding the anti-vibration rubber body 3 and the like in the bracket 1, the bracket 1 is molded in a slightly open U-shape as shown in FIG. To make the side walls 1a and 1b parallel to each other. As a result, the vibration-proof rubber body 3 is deformed by compression, the internal stress is converted from tension to compression, and the durability is improved. In this case, the bracket side walls 1a and 1b are deformed further inward than in the parallel state, and are received in the elastic elastic force of the vibration-proof rubber body 3 to open in the parallel state.

Bracket 1 with side walls 1a and 1b parallel to each other
A backup plate 4 (FIG. 1) is attached to the opening of the backup plate 4 so that both ends overlap the flange 11. The backup plate 4 has a protrusion 41 whose middle portion bends into the bracket 1,
The protrusions 41 push the stopper bodies 32, 33 into the bracket 1 by a predetermined amount. Thus, there is a stopper clearance d1 between the upper side surface 3a of the vibration-proof rubber body 3 and the stopper rubber layer 31, and the lower side surface 3b and the stopper body 32.
A stopper clearance d2 is formed between each of them and 33.

The bracket 1 is fixed to the vehicle frame as a base body by bolts penetrating the flange 11 and the backup plate 4, and the engine as a vibrating body is fixedly supported by the bolts inserted in the inner cylinder 2. The rubber elastic body 3 is deformed under the load of the engine and the inner cylinder 2 is relatively displaced. However, by appropriately setting the protrusion amount of the backup plate protrusion portion 41, the stopper clearances d1 and d2 after displacement can be obtained.
Can be approximately equal.

In this way, even if the engine weight varies to some extent, by adjusting the amount of protrusion of the backup plate 4, it is possible to easily cope with it without changing the vibration-proof bushing body.

In this embodiment, the conventional drawing process and press-fitting process are unnecessary, so that the manufacturing is simple. Particularly, when the dynamic damper is provided, the rubber layer of the same is molded at the same time as the molding of the vibration-proof rubber body. As a result, it is possible to reduce the number of manufacturing steps.

[0017]

As described above, the vibration-proof bushing of the present invention is
Since the throttle and press-fitting steps are not required, it can be manufactured at low cost, and it can be applied to various engines by changing only the backup plate.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of a vibration isolation bush.

FIG. 2 is a perspective view of an anti-vibration bush.

FIG. 3 is a perspective view in the manufacturing process of the vibration-proof bush.

FIG. 4 is a perspective view of a conventional anti-vibration bush.

FIG. 5 is a perspective view of a conventional bracket.

[Explanation of symbols]

 1 Bracket 1a, 1b Side wall 2 Inner cylinder 3 Anti-vibration rubber body 3a, 3b Side surface 31 Stopper rubber layer 32, 33 Stopper rubber body 4 Backup plate 41 Projection part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yutaka Ito 1 Ochiai, Nagachi, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Within Toyoda Gosei Co., Ltd. Toyoda Gosei Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. A metal plate body is formed into a U-shape to form a bracket, and both ends of a vibration-proof rubber body are joined and disposed between opposing side walls of the bracket. Is provided with an inner cylinder passing through this, and a stopper rubber layer is formed on the curved inner peripheral surface of the top of the bracket so as to face one side surface of the anti-vibration rubber body at a predetermined interval. A stopper rubber body is provided on each of the side walls, the stopper rubber body protruding in the opposite direction and having its tip close to each other, and the bracket opening has a protruding portion bent and protruded into the bracket by a predetermined amount. An anti-vibration bush characterized in that a backup plate is pushed over and fixed to the other side surface of the anti-vibration rubber body so as to oppose them at a predetermined interval.