JPH0510359A - Vibration-proof bush - Google Patents

Abstract

PURPOSE:To absorb and reduce minor vibrations, restrict the excessive deformation of a vibration-proof rubber body, and extend its life by forming multiple through spaces in the vibration-proof rubber body, and arranging stopper sections in the through spaces. CONSTITUTION:An inner tube 1 and an outer tube 2 are concentrically provided, and a vibration-proof rubber body 3 is connected between them. Spring force adjusting spaces 3a-3d penetrated in the axial direction are formed in the vibration-proof rubber body 3, and the spring constant in this direction is reduced. Stopper sections 41a-41d of a stopper body 4 are inserted into the through spaces 3a-3d respectively, and the holding plate section 42 of the stopper body 4 is coupled and fixed on the outer periphery at the end section of the inner tube 1. Stopper gaps are formed between the stopper sections 41a-41d and the inner peripheries of the through spaces 3a-3d, minor vibrations are absorbed and reduced by the small spring constant, the excessive deformation of the vibration-proof rubber body 3 due to large vibrations is restricted by the stopper sections 41a-41d, and the durability is maintained.

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 a structural improvement of an anti-vibration rubber body having a plurality of through spaces for spring force adjustment.

[0002]

2. Description of the Related Art A vibration-isolating bush used in an engine mount or the like has a vibration-isolating rubber body joined between a concentric inner cylinder and an outer cylinder. In order to adjust the force, there is one in which a spring force adjusting space that penetrates in the axial direction is formed in the outer peripheral portion of the rubber body that contacts the inner periphery of the outer cylinder.

[0003]

By the way, forming a through space for adjusting the spring force lowers the spring constant and is advantageous in reducing the absorption of small vibrations. However, when a large vibration is input, a vibration-proof rubber body is provided. Is greatly deformed and its durability becomes a problem.

Therefore, conventionally, a stopper rubber is provided on the inner peripheral surface of the outer cylinder so as to project into the through space, and a vibration-proof rubber member is brought into contact with the stopper rubber to restrict deformation of the vibration-proof rubber member beyond a certain level. ing. Normally, this stopper rubber is molded at the same time as the anti-vibration rubber body, but if multiple through-spaces are provided in the anti-vibration rubber body in order to accommodate vibration input from multiple directions, molding during molding becomes complicated. This leads to problems such as increased cost and difficulty in production, and also requires changing the mold to change the stopper gap.

The present invention solves the above problems, and provides a vibration-proof bushing capable of maintaining the durability of the vibration-proof rubber member with a simple and inexpensive structure when a plurality of through spaces for spring force adjustment are provided. To do.

[0006]

To explain the structure of the present invention, a vibration-proof rubber body 3 is provided between an inner cylinder 1 and an outer cylinder 2 which are concentrically provided.
And a plurality of spring force adjusting spaces 3a, 3b, 3c, 3d penetrating in the axial direction are formed in the anti-vibration rubber body 3 and are respectively inserted into these penetrating spaces 3a to 3d. Stopper portions 41a, 41b, 41c, 41d that form predetermined gaps d1, d2 with the inner peripheral surface,
A holding plate portion 42 that holds the base ends of the stopper portions 41a to 41d and is mounted and fixed to the end portion of the inner cylinder 1.
Is provided with a stopper body 4.

[0007]

In the vibration-proof bush having the above structure, since the stopper body is manufactured separately from the body of the vibration-proof bush, it is easy to mold the vibration-proof rubber body during molding, and the cost can be reduced. Further, the stopper portion is inserted into each through space at the same time when the holding plate portion is attached to the inner cylinder, so that the assembly is also easy.

Furthermore, the adjustment of the stopper gap can be easily changed by changing the shape of each stopper portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a vibration-proof rubber body 3 is disposed inside a thin-walled metal outer cylinder 2 and its center is centered on the outer cylinder 2 and has a thick inner cylinder. 1 is buried through. In the vibration-proof rubber body 3, arc-shaped recesses penetrating in the axial direction are formed at four locations on the outer peripheral surface in contact with the inner periphery of the outer cylinder 2 to form through spaces 3a, 3b, 3c, 3d, The spaces 3a, 3b and 3c, 3d at symmetrical positions have the same shape.

The stopper body 4 is an integrally molded product of a rubber material, and has a circular holding plate portion 42 and wall-shaped stopper portions 41a, 41b, which are formed to project laterally from four locations on the outer periphery of the plate surface.
It is composed of 41c and 41d. Each stopper part 4
1a to 41d are provided corresponding to the respective through spaces 3a to 3d of the antivibration rubber body 3, and the cross-sectional shape thereof corresponds to the corresponding through space 3.
The shape is substantially similar to the cross section of a to 3d. A mounting hole 421, which is slightly smaller than the outer diameter of the inner cylinder 1, is provided at the center of the holding plate portion 42.

The stopper body 4 includes stopper portions 41a.
41d are inserted into the corresponding through spaces 3a to 3d, and the mounting holes 421 of the holding plate 42 are fitted and fixed to the outer periphery of the end of the inner cylinder 1 exposed from the vibration-proof rubber body 3. In this state, the stopper portions 41a to 4a located in the through spaces 3a to 3d, respectively.
As shown in FIG. 2, a gap d1 is formed at the left and right positions and a gap d2 is formed at the upper and lower positions between 1d and the arcuate bottom surfaces of the through spaces 3a to 3d.

When a minute vibration is input from the vertical and horizontal directions,
Since the through spaces 3a to 3d are formed, the spring constant of the vibration-proof rubber body 3 is small, and effective vibration absorption is achieved. On the other hand, when large vibrations are input from the vertical and horizontal directions, the anti-vibration rubber body comes into contact with the stopper portions 41a and 41b due to the displacement of d1 in the lateral direction, and comes into contact with the stopper portions 41c and 41d due to the displacement of d2 with respect to the vertical direction. Further deformation is prevented. As a result, large vibration is suppressed and the life of the vibration-proof rubber body 3 is prevented from being shortened due to excessive deformation.

In the above embodiment, the number of through spaces is not limited to four.

[0014]

As described above, the vibration-proof bushing of the present invention is
By forming multiple through-spaces inside the anti-vibration rubber body, it effectively reduces the absorption of small vibrations, and the stoppers located in each of the through-spaces prevent excessive deformation of the anti-vibration rubber body, resulting in a long service life. It is possible to improve and manufacture, assembling, adjustment of the stopper gap, and the like can be performed easily and inexpensively.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a vibration isolation bush.

FIG. 2 is a cross-sectional view of a vibration isolation bush.

[Explanation of reference numerals] 1 inner cylinder 2 outer cylinder 3 anti-vibration rubber body 31a, 31b, 31c, 31d through space 4 stopper body 41a, 41b, 41c, 41d stopper portion 42 holding plate portion 421 mounting hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Ito 1 Kasuga-cho, Nishikasugai-gun, Aichi Ochiai, Nagahata No. 1 in Toyoda Gosei Co., Ltd. Toyoda Gosei Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. A vibration damping rubber body is joined between an inner cylinder and an outer cylinder which are concentrically arranged, and a space for adjusting a spring force is axially penetrated through the vibration damping rubber body. A plurality of stoppers, each of which is inserted into each of the through spaces to form a predetermined gap with the inner peripheral surface of the through space, and which holds the base ends of the stoppers and ends of the inner cylinder. An anti-vibration bush characterized in that a stopper body including a holding plate portion fixedly attached to the portion is provided.