JPH0639152Y2 - Liquid filled anti-vibration bush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a liquid-filled vibration damping bush, and more particularly to a liquid-filled vibration damping bush that is light in weight and facilitates formation of a throttle channel.

<Prior Art> Cylindrical anti-vibration bushes are often used in engine mounts and the like, and in recent years, a plurality of liquid chambers and throttle channels that connect these liquid chambers have been provided in the anti-vibration rubber body so There is one that effectively damps large engine vibrations due to flow resistance.

Explaining an example thereof with reference to FIGS. 5 and 6, an outer cylinder 2 is press-fitted into a cylindrical seal sleeve 5, and a vibration-proof rubber body 3 is provided in the outer cylinder 2 across the outer cylinder 2. An inner cylinder 1 is provided at the center of the lower half of the vibration-proof rubber body 3, and a cavity 31 is formed in the upper half so as to penetrate in the horizontal direction. Communicating with the openings 21 and 22 provided in
It constitutes the main liquid chamber A.

On the other hand, a rubber film 6 constituting the chamber wall of the sub liquid chamber B is stretched over the opening 23 provided in the lower portion of the peripheral surface of the outer cylinder 2.

The outer cylinder 2 has a gradually decreasing diameter at the center of the peripheral surface, and a ring member 4 having a shallow U-shaped cross section is fitted to this portion so that the bottom is in contact with the peripheral surface of the outer cylinder 2. The ring member 4 is provided with openings 41 and 42 at two locations in the circumferential direction, and these openings 41 and 42 communicate with the liquid chambers A and B, respectively.

The ring member 4 has an open space closed by the inner peripheral wall of the seal sleeve 5 in a state where the outer cylinder 2 is press-fitted into the seal sleeve 5, and forms a throttle channel F connecting the liquid chambers A and B. There is.

As shown in FIG. 7, the ring member 4 is composed of a pair of semi-circular arc members 46 and 47, which are abutted on the outer circumference of the outer cylinder 2.

When a large vertical vibration is input to the liquid-filled anti-vibration bush having such a structure, the relative position between the inner cylinder 1 and the outer cylinder 2 changes significantly, and accordingly, the volume of the main liquid chamber A changes and the sealed liquid is generated. It circulates in the throttle channel F, and the flow resistance at this time causes a vibration damping action.

An anti-vibration bush in which the ring member is composed of a pair of semi-arcuate members is disclosed in Japanese Utility Model Laid-Open No. 61-202738, and a ring member composed of a complete ring member is actually used. It is disclosed in Japanese Laid-Open Patent Publication No. 62-50344.

<Problems to be solved by the invention> By the way, the ring member has a complicated three-dimensional shape,
Since high precision is required from the viewpoint of sealing property, there is a problem that it takes time and effort to manufacture and manage parts, and the assembling property is poor.

The present invention solves such problems, and an object thereof is to provide a lightweight liquid-filled vibration damping bush, which is easy to manufacture, reduces the labor for parts management, and can be assembled easily. And

<Means for Solving the Problems> The structure of the present invention will be described with reference to FIG. 1. An anti-vibration rubber body 3 is arranged between an inner cylinder 1 and an outer cylinder 2 which is arranged with its axial direction aligned. A plurality of liquid chambers A and B are formed in the anti-vibration rubber body 3, and a ring member 4 having a U-shaped cross section is fitted to the outer periphery of the outer cylinder 2 with its bottom surface in contact, and The openings 41 and 42 provided at different positions on the bottom surface are made to communicate with the respective liquid chambers A and B through the openings 21 and 23 provided in the outer cylinder 2, and the outer cylinder 2 fitted with the ring member 4 is attached. A liquid-filled anti-vibration bush which is press-fitted into the cylindrical seal sleeve 5 to close the open space of the ring member 4 by the inner peripheral wall of the seal sleeve 5 to form a throttle flow passage F that connects the liquid chambers A and B. Is the ring member 4 made of a synthetic resin material.

<Operation> In the liquid-filled anti-vibration bush having the above structure, the ring member is made of a synthetic resin material, and can be easily processed by a conventionally known processing means such as cutting or injection molding, and is extremely lightweight.

Further, since the ring member is an integrated product, labor for storing and manufacturing the parts is unnecessary.

<Embodiment> FIG. 1 is a sectional view of an anti-vibration bush showing an embodiment of the present invention, and the basic structure is the same as that of the conventional example.

That is, the outer cylinder 2 is press-fitted into the cylindrical seal sleeve 5, and the outer cylinder 2 has a stepwise small diameter in the central portion of the peripheral surface (FIG. 3). Then, openings 21, 22, 23 are provided at the left and right positions and the lower position of the central portion of the peripheral surface having a small diameter.

An anti-vibration rubber body 3 is provided across the outer cylinder 2 and the inner cylinder 1 is embedded in the lower half of the outer cylinder 2 and a cavity is formed in the upper half of the outer cylinder 2 in a direction orthogonal to the inner cylinder 1. 31 is formed,
It communicates with the openings 21, 22. A rubber film 6 is stretched over the opening 23 of the outer cylinder 2.

A ring member 4 is fitted to the central portion of the peripheral surface of the outer cylinder 2. The ring member 4 is made of a synthetic resin material such as polyacetal, and has a shallow U-shaped cross section having a flange portion at the open edge except for a part, as shown in FIGS. 2 and 3. It is cut open at one place in the direction (4 in the figure)
a).

The peripheral surface of the ring member 4 facing the cutout portion 4a is solid within a certain angle range, and openings 41 and 42 are provided at the peripheral surface bottom portions near both end surfaces of the solid portion 43, respectively.

The ring member 4 expands the incision 4a by expanding the incision 4a, and is fitted to the central portion of the peripheral surface of the outer cylinder 2. When the entire outer cylinder 2 is press-fitted into the seal sleeve 5 in the liquid with the incision 4a closed, the open space of the ring member 4 is closed by the inner peripheral wall of the seal sleeve 5, and the cavity 31
The main liquid chamber A formed inside and the sub liquid chamber B formed between the rubber film 6 and the ring member 4 serve as a throttle flow passage F that communicates through the openings 41 and 42.

In the above-described embodiment, as shown in FIG. 4, the projections 44 and the recesses for locking the projections 44 are formed on both end surfaces of the ring member cutout 4a.
If 45 is formed, the incision part can be securely attached to the outer cylinder 2 when fitted.
4a can be closed, and press-fitting work becomes easier.

The cutout portion 4a may be formed at the same time when the ring member 4 is molded, or may be cut out after molding.

Further, the ring member 4 may be formed so as to be slightly smaller than the diameter of the outer cylinder 2 so that it is held on the outer cylinder peripheral surface by its own spring force during fitting.

Further, the seal sleeve 5 is formed to be slightly large,
The outer cylinder 2 fitted with the ring member 4 may be inserted thereinto to draw-form the seal sleeve 5, thereby closing the incision 4a.

<Effects of the Invention> As described above, according to the liquid-filled anti-vibration bush of the present invention, it is possible to easily manufacture the ring member that constitutes the throttle channel, and also to reduce the labor for manufacturing and managing parts. The weight of the liquid filled vibration isolation bush can be reduced.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an overall cross section of a liquid filled vibration damping bush, FIG. 2 is a front view of a ring member, and FIG. 3 is a liquid filled vibration damping bush. FIG. 4 is an exploded perspective view of a main part, FIG. 4 is an enlarged plan view of a ring member incision part in another embodiment of the present invention, and FIGS.
FIG. 5 is an overall cross-sectional view of the liquid-filled anti-vibration bush, a cross-sectional view taken along the line IV-IV of FIG. 5, and FIG. In the figure, 1 ... Inner cylinder 2 ... Outer cylinder 21, 23 ... Opening 3 ... Anti-vibration rubber body 31 ... Cavity 4 ... Ring member 4a ... Cutout 41, 42 ... Opening 5 ... Seal sleeve 6 ... Rubber film A, B ... Liquid chamber F ... Restricted flow path

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography SHO 61-202738 (JP, U) RIE 62-50344 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An anti-vibration rubber body is disposed between an inner cylinder and an outer cylinder arranged in axial alignment with the inner cylinder, and a plurality of liquid chambers are formed in the anti-vibration rubber body. A ring member having a U-shaped cross section is fitted to the outer circumference of the outer cylinder so that its bottom surface is in contact with the outer cylinder, and openings provided at different positions on the bottom surface communicate with the respective liquid chambers through the openings provided in the outer cylinder. The outer cylinder having the ring member fitted therein is press-fitted into the cylindrical seal sleeve to close the open space of the ring member by the inner peripheral wall of the seal sleeve, thereby forming a throttle channel communicating between the liquid chambers. A liquid-filled anti-vibration bush, wherein the ring member is made of synthetic resin.