JPH0560170A - Liquid seal vibration isolator - Google Patents

Abstract

PURPOSE:To provide a vibration isolator which has a low manufacturing cost and excellent durability. CONSTITUTION:A main liquid room A, which is formed with a thick rubber vibration isolator 1 as a room wall to support a vibration element, is partitioned from an auxiliary liquid room B by a partition plate 3 on which a throttle flow passage 31 is formed. A connection member 2 is provided on the top face of the rubber vibration isolator 1 to connect the vibration element and the cylinder plate 23 thereof is projected into the main liquid room. The projected cylinder plate has the lower end 21 transformed with the diameter enlarged in horizontal and formed as a stirring plate P. The stirring plate which is complete with the cylinder plate requires no labor for assembly to another and lowers cost. A distortion collective section 1a is pre-compressed when the stirring plate is formed with the diameter enlarged, therefore improves the durability of a vibration isolator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled vibration damping device,
In particular, the present invention relates to a liquid-filled anti-vibration device that absorbs high-frequency vibrations by providing a stirring plate in the liquid chamber to cause liquid resonance.

[0002]

2. Description of the Related Art Among liquid-filled anti-vibration devices, a stirrer plate is provided in the liquid chamber and the stirrer plate vibrates in response to a vibration input to stir the filled liquid to generate liquid resonance particularly in a high frequency range, thereby achieving good vibration absorption. There are things to try.

By the way, the structure of a conventional liquid-filled vibration isolator having a stirrer plate is embedded in the top wall of a vibration-proof rubber body to form a vibration body as shown in, for example, Japanese Patent Laid-Open No. 63-266242. The stirring plate arranged in the liquid chamber is fixed to the connecting member for connecting and supporting by screwing or caulking.

[0004]

However, this structure has a problem that the manufacturing cost increases because the stirring plate is separately manufactured and assembled.

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 liquid-filled vibration isolator in which a stirring plate is integrally molded to realize a significant cost reduction.

[0006]

The structure of the present invention will be described. In a liquid filled vibration isolator, a liquid chamber A is formed in a vibration isolating rubber body 1, and at the top of the vibration isolating rubber body 1, A connecting member 2 for connecting the vibrating body is provided therein, one end 21 of the connecting member 2 is formed into a tubular shape so as to project into the liquid chamber A, and the tubular protruding portion 21 is formed to have an enlarged diameter. To form a stirring plate P.

[0007]

In the above structure, when vibration is input from the vibrating body, the vibration-proof rubber body 1 is deformed, and the connecting member 2 provided on the top thereof.
Also vibrates together. Then, the stirring plate P formed at the one end 21 of the connecting member 2 vibrates, stirs the enclosed liquid, causes liquid resonance, and absorbs the vibration.

In the present invention, since the stirring plate P is formed integrally with the connecting member 2, the labor of production and assembly can be reduced, and the cost can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a vibration-proof rubber body 1 is a thick-walled cylindrical body that expands downward, and a connecting member 2 is embedded in the center of the body. The connecting member 2 is composed of a support plate 22 joined to the top surface of the anti-vibration rubber body 1 and a cylindrical plate 23 projecting downward from the lower surface thereof. The cylindrical plate 23 is vertically divided by a horizontal partition wall 24. At the same time, the peripheral wall of the lower end 21 extending downward of the vibration-proof rubber body 1 opens horizontally outward to form a stirring plate P.

The upper half inner circumference of the cylindrical side plate 5 is joined to the opening edge of the vibration-proof rubber body 1, and the partition plate 3 having the throttle channel 31 formed on the outer circumference is fitted in the lower half part of the side plate 5. I'm wearing it. A rubber film 4 is disposed below the partition plate 3, and an outer peripheral portion of the side plate 5 is provided along with an outer peripheral portion of the partition plate 3 and an outer peripheral portion of a container-shaped bottom plate 6 arranged to receive the rubber film 4 from below. It is fixed by caulking to the opening edge at the lower end of. Then, the liquid is sealed in the closed space formed by the vibration-proof rubber body 1 and the rubber film 4, and the main liquid chamber A is formed above the partition plate 3 and the sub liquid chamber B is formed below the partition plate 3. ..

A vibrating body such as an engine is placed on the upper plate 22 and is connected and fixed by the bolts 25, and the vibration damping device main body is fixed to the vehicle body frame by the bolts 61 of the bottom plate 6.

The connecting member 2, the vibration-proof rubber body 1, and the side plate 5 are integrally insert-molded in the mold in the shape shown in FIG.
The lower end 21 having a constant diameter of the cylindrical plate 23 covered with is expanded and shaped to obtain the stirring plate P shown in FIG. In the process of forming the stirring plate P, the boundary portion 1a between the vibration-proof rubber body 1 and the rubber layer 11 where strain is likely to be concentrated is pre-compressed, and the durability is improved.

The tip of the stirring plate P is opposed to the upper surface of the partition plate 3 and the inner peripheral surface of the side plate 5 at a constant interval, and when large vibrations in this direction are input, they come into contact with each other to form a stopper action.

When a relatively low-frequency relatively large vibration is input from the engine, the connecting member 2 moves up and down in response to this, and the anti-vibration rubber body 1 is deformed to pass from the main liquid chamber A through the throttle passage 31 to the sub liquid chamber. The enclosed liquid flows to B. Due to the liquid resonance in the throttle channel 31 at this time, a large damping force is generated in the low frequency region, and the vibration is quickly attenuated and reduced.

When a high-frequency (300 Hz or more) micro-vibration is input from the engine, the stirring plate P integrally formed at the tip of the connecting member 2 vibrates vertically in response to the vibration input to stir-excite the surrounding liquid. To do. As a result, the filled liquid in the main liquid chamber A resonates, the dynamic spring constant of the device is rapidly reduced, and the vibration is quickly absorbed.

[0016]

As described above, since one end of the connecting member is expanded and deformed to integrally form the stirring plate, it is not necessary to separately manufacture and assemble the stirring plate, and the manufacturing cost can be greatly reduced. At the same time, the durability of the device can be improved.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view at the time of molding a vibration-proof rubber body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anti-vibration rubber body 2 Connecting member 21 Lower end (one end) 22 Upper plate 23 Cylindrical plate 3 Partition plate 4 Rubber film A Main liquid chamber (liquid chamber) B Sub liquid chamber P Stirrer plate

Claims (1)

[Claims] 1. A liquid chamber is formed in a vibration-proof rubber body, and a connecting member for connecting the vibrator to the vibration-proof rubber body is provided at the top of the vibration-proof rubber body, and one end of the connecting member is formed into a tubular shape. A liquid-filled anti-vibration device, characterized in that the cylindrical projecting portion is formed into a stirring plate by expanding the tubular projecting portion while projecting it into the liquid chamber.