JPS58118345A - Method of providing liquid in sealed state in liquid-filled anti-vibration device - Google Patents

Abstract

PURPOSE:To enhance the durability of a liquid-filled anti-vibration device, by allowing no stress to act to the wall of a fluid chamber made of a thin elastic rubber material, when a vehicle engine or the like is supported by the device. CONSTITUTION:A thin elastic rubber wall 2 is pushed in by a thrusting jig 10 which has a slightly less diameter than a second fluid chamber B and whose tip has a spherical face, so that the dome-shaped wall 2 has its central part curved downwards and is formed as waves so the volume of the second fluid chamber is decreased. A first fluid chamber A is then closed by a cover plate 8. Even when an engine is supported, no tensile stress acts to the thin elastic rubber wall 2 so that the durability and liquid tightness are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has elastically deformable first and second fluid chambers that are communicated by a throttle hole, and when a vibration is applied, the enclosed liquid flows through the throttle hole to provide a vibration damping effect. This type of liquid-filled vibration isolator is applied to the engine support part of a vehicle, and is generally used for engine support. a first fluid chamber whose chamber wall is made of a thick rubber elastic body that also serves as a support for a supported body such as the like, and a second fluid chamber whose chamber wall is a bellows or sheet-like thin rubber elastic body; It is equipped with a throttle hole as a basic element that allows communication between the two fluid chambers.For example, if this device is installed on the vehicle body,
When the engine is supported by I, the vibration of the engine deforms the chamber wall of the first fluid chamber and changes the volume of the fluid chamber.
A fluid pressure difference is generated between the two fluid chambers, and the sealed liquid flows through the throttle hole, and the flow resistance at that time causes a vibration damping effect.By the way, a device filled with liquid is installed in, for example, a vehicle body. At the same time, when the engine is supported by the chamber wall of the fluid chamber @1, the chamber wall of the first fluid chamber deforms due to the load of the engine, and the volume of the fluid chamber becomes smaller. The liquid flows into the second fluid chamber, and the second fluid chamber expands. Therefore, tensile stress is constantly applied to the wall of the second fluid chamber made of a thin rubber elastic body, reducing durability.
Therefore, the present invention seals the liquid so that stress is not applied to the chamber wall of the second fluid chamber when the supported object is supported. The purpose of this method is to reduce the volume by pushing 111II of the second fluid chamber into a concave shape with a jig or the like, and in this state, fill and seal liquid into both fluid chambers. The objective is to be achieved by

However, in the vibration isolating device filled with liquid according to the present invention,
When this is installed to support the supported body, the sealed liquid moves from the first fluid chamber to the second fluid chamber.
Although the volume of the fluid chamber increases and the chamber wall changes closer to its original shape, it does not reach a state where stress is applied to the chamber wall.

The most preferable method is to set the lateral contraction of the second fluid chamber when filling the liquid so that the chamber wall of the second fluid chamber returns to its original shape near the maximum load due to vibration of the supported body. be. According to the present invention, the durability and sealing performance of the chamber wall are improved without excessive tensile stress acting on the thin second fluid chamber at all times and during operation.

The figures show an example of a liquid-filled vibration isolating device to which the present invention is applied, with FIG. 1 showing the liquid-filled state and FIG. 2 showing the device in an installed state.

In FIG. 1, A is a first fluid chamber, and B is a second fluid chamber. Reference numeral 1 denotes a truncated cone-shaped thick internal rubber elastic body wall constituting the chamber wall of the first fluid chamber A, and a conical recess is formed in the bottom surface. The above rubber elastic body I! A caulking metal fitting 5 is attached to the lower outer periphery of 1. Further, the center portion of the support plate 4 is buried in the upper part of the rubber elastic body J11. An annular caulking metal fitting 6 is welded to the upper surface of the center portion of the support plate 4, and bolts 5m and 5b are erected on both sides thereof, and both outer ends thereof are bent downward. A throttle hole 11 is formed in the rubber elastic wall 1 at a narrow portion thereof and passes through the rubber elastic wall 1 in the vertical direction. The rubber elastic body wall 1, the crimp JIr5, and the support plate 4 provided with the caulking metal fittings 6 and the bolts 5, 5b are assembled by setting the caulking metal fittings 5 and the support plate 4 in a mold to form the rubber elastic body wall 1. It is integrally molded by injecting the rubber material to be formed. At this time, the rubber material is made to wrap around the upper center surface of the support plate 4.

Thin rubber elastic body J12 forming the chamber wall of the second fluid chamber B
It is formed into a dome shape as shown by the broken line, and a caulking metal fitting 7 is embedded in the outer peripheral edge. Then, by joining both caulking fittings 6.7, the thin rubber elastic body [! 2
is a thick inner rubber elastic body! ! In order to seal a liquid into a single device attached to 1, first, the support plate 4 provided with the caulking metal fitting 6 and the bolts 5m and 5b, and the caulking metal fitting 3 are
Thick-walled rubber elastic stop 11 and caulking fitting 7 with integrated
A thin rubber elastic body I! 2. Attach the thin rubber elastic body wall 2 to the thick rubber elastic body wall 1 by immersing the cover plate 8 in the liquid and caulking the caulking fittings 6.7. Next, use the pushing jig 10 to attach the thin rubber elastic body wall 2 The jig 10 for pushing in the rubber elastic body wall 2 has a slightly smaller diameter than the second fluid chamber B and has a curved surface with a spherical tip. has a waveform whose central portion is curved downward, and the volume of the second fluid chamber B is reduced.

In this state, the first fluid chamber A is closed with the cover plate 8.

The second fluid chamber B maintains its waveform due to the voltage even if the jig 10 is removed.

In order to install the vibration isolator constructed in this way on the vehicle body, first, the center part should be dome-shaped and the ventilation hole 5 should be installed.
1 is placed on the support plate 4.The next device is housed in a stopper member 9 that prevents excessive deformation of the rubber elastic body I11, and the stopper member 9 is placed on the bracket 20 fixed to the body. do. 1171 parts! When the hole 40C is screwed into the hole 5c which penetrates the bracket 20 and protrudes downward, the cover plate 8, the stopper member 9 and the bracket 2C are integrally connected. The stopper member 9 is such that when the rubber elastic body J11 within the thickness is deformed by the vibration of one support, the upper end of the vertical portion of the member 9 comes into contact with the lower surface of the support plate 4 that is opposed to this, and the rubber elastic body within the thickness This serves to prevent excessive deformation of the material.

Furthermore, by covering the protection plate 50 stacked on the support plate 4 with a bracket 30 attached directly or indirectly to the engine (not shown), the engine is supported by the vibration isolating device, and the protection plate 50 and bracket 50 are The engine is fixed by tightening the nuts 40m and 40b to the bolts sa and sb that pass through and protrude upward.Thus, the thick rubber elastic wall 1, which is the mal of the first fluid chamber A, receives the load of the engine. It is deformed and slightly crushed, and its volume is reduced, and the sealed liquid enters the second fluid chamber BN- through the throttle hole 11, and the thin rubber elastic body 2 on the chamber wall is deformed into a shape approaching its original shape. However, the waveform shape is still maintained.

However, when driving a vehicle, engine vibrations cause the first fluid wi
By acting on the chamber wall of chamber A and deforming it, a difference in liquid pressure is generated between fluid chambers A and B due to a change in volume, and as the sealed liquid flows through the throttle hole 11, a vibration damping effect is achieved. The thin rubber elastic chamber wall 2 of the second fluid chamber B can deform with almost no tensile stress. Therefore, tensile stress is constantly applied as in the conventional case, and excessive stress is not applied to t when vibration is applied, and durability and sealing performance can be maintained over a long period of time.

It should be noted that the present invention is not limited to the vibration isolating device of the above embodiment, but also includes a first fluid chamber made of a thick rubber elastic body chamber wall and a second fluid chamber made of a thin rubber elastic body chamber wall, These devices can be widely applied to liquid filling in a vibration isolating device that seals liquid into a fluid chamber. Further, the means for deforming the chamber wall of the second fluid chamber during liquid filling is not limited to the pushing jig shown in the figure, but any suitable means may be used.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a liquid-filled vibration isolator in which liquid is sealed according to the present invention, and FIG. 2 is a cross-sectional view showing a state in which the liquid-filled vibration isolator is installed. A-First fluid chamber B-Second fluid chamber 1-Thick rubber elastic wall 2-Thin rubber elastic wall 10-Pushing jig 11- Throttle hole agent Patent attorney Mokuma Ito Figure 1

Claims (1)

[Claims] A fluid chamber of fJII, 1 whose chamber wall is made of a thick rubber elastic body, and a second fluid chamber whose chamber wall is made of a thin rubber elastic body are formed in the partition between these two fluid chambers, and both fluid chambers are formed in the partition between the two fluid chambers. A liquid filling method for a liquid filling vibration isolator equipped with a throttle hole that connects the chambers, wherein the chamber wall of the second fluid chamber is pushed in to reduce the volume of the fluid chamber, and the second fluid chamber is filled with water in both fluid chambers. A liquid filling method for a liquid filled vibration isolator, which is characterized by filling and sealing a liquid.