JPH04312233A - Liquid seal vibration isolating device - Google Patents

Abstract

PURPOSE:To generate sufficient vibration clamping force through a simple structure. CONSTITUTION:A liquid chamber A which has a chamber wall formed of a rubber vibration isolator 1 to support a vibrating body and enclosed silicon oil is formed, and a cylindrical piston member 4 is fixed to an upper plate 2 and protrudes into the chamber A. A bottom plate 3 is provided with a rubber cylindrical member 5 in which the piston member is slidably fitted. A liquid circulating groove 41 extending axially is formed on the periphery of the piston member. When vibration is inputted, the upper plate and the bottom plate move relatively to each other, and the piston member moves back and forth in the cylindrical member. The silicon oil circulates between the cylindrical member and the liquid chamber through the liquid circulating groove, and generates frictional force between the inner wall of the liquid circulating groove and itself during its circulation, or shearing force in the liquid, and in addition to that, liquid resonance to display sufficiently strong vibration damping force.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a liquid-filled vibration isolator,
In particular, the present invention relates to a liquid-filled vibration isolator that generates a damping force using a sealed viscous liquid.

0002

BACKGROUND OF THE INVENTION As a vibration isolating device that generates a vibration damping force by enclosing a viscous liquid, there is a known one that uses a stirring plate to stir the viscous liquid, as shown in Japanese Patent Application Laid-Open No. 139938/1983, for example. ing.

0003

However, there has been a problem that sufficient damping force cannot be obtained only by the shear resistance of the viscous liquid during stirring.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and it is an object of the present invention to provide a liquid-filled vibration isolator that can obtain a sufficiently large vibration damping force with a simple structure.

[0005]

[Means for Solving the Problems] To explain the structure of the present invention, a liquid chamber is provided with a viscous liquid sealed by a chamber wall 1 which is connected at one end to a vibrating body 2 and at the other end to a base body 3 and deforms in response to vibration input. A is formed and a piston member 4 is provided to protrude into the liquid chamber A from the vibrating body 2 or the base body 3, and the piston member 4 is fitted into the base body 3 or the vibrating body 2 where the piston member 4 is not provided. A cylinder member 5 is provided, and a liquid circulation groove 41 extending in the axial direction is formed at at least one location in the circumferential direction on the outer periphery of the piston member 4 or the inner periphery of the cylinder member 5.

In the vibration isolator having the above structure, when vibration is input, the vibrating body 2 and the base body 3 are relatively displaced, and the piston member 4
moves back and forth within the cylinder member 5. Accordingly, the viscous liquid flows from or into the cylinder member 5 through the liquid circulation groove 41 . When the viscous liquid is distributed, it is placed in the liquid distribution groove 4.
A frictional force is generated between the liquid and the inner wall of the liquid, a shearing force is generated within the liquid, and liquid resonance is generated, thereby exerting a sufficiently large vibration damping force.

[0007]

[Embodiment] In FIG. 1, the cylindrical side plate 6 has a bottom plate 3 at its lower end.
The bottom plate 3 is fixed by bolts 31 to a base such as a vehicle body frame. A container-shaped thick vibration isolating rubber body 1 that opens downward is joined to the enlarged diameter upper half of the side plate 6 at its opening edge. Liquid chamber A is filled with liquid silicone oil.
It is as follows.

An upper plate 2 is embedded in the top of the vibration isolating rubber body 1, and a rod-shaped connecting member 7 is driven and fixed into the center hole of the upper plate 2 from below. The tip extending upward is a bolt portion 71. The engine, which is a vibrating body, is placed on the upper plate 2 and fixed by bolts 71.

A piston member 4 is fixed to the lower surface of the upper plate 2 and is located within the liquid chamber A. As shown in FIG. 2, the piston member 4 is a metal cylinder whose upper end is closed, and a mounting opening 42 is provided at the center of the closed end surface, and the connecting member 7 is inserted into the opening 42 and driven into the upper plate 2. The large-diameter base end 72 of the connecting member 7 is clamped to the lower surface of the upper plate 2. The outer periphery of the piston member 4 has a semicircular cross section at four points in the circumferential direction and is depressed inward to form liquid flow grooves 41 extending in the axial direction.

A cylinder member 5 is provided in the liquid chamber A on the bottom plate 3, and this is made of a thick rubber wall formed into a cylindrical shape. They are inset in contact with each other.

When vibration is input to the vibration isolator, the vibration isolator 1 deforms and the relative position of the top plate 2 and bottom plate 3 changes, and the piston member 4 moves up and down within the cylinder member 5 accordingly. . Therefore, the silicone oil inside the cylinder member 5 is
When the piston member 4 descends, the liquid flows into the liquid chamber A through the liquid circulation groove 41, and when the piston member 4 rises, the liquid flows into the liquid circulation groove 4.
1 and flows into the cylinder member 5. During the flow, the silicone oil generates a frictional force with the inner wall of the liquid distribution groove 41.
Alternatively, a shearing force is generated within the liquid, and furthermore, liquid resonance is generated to generate a sufficiently large vibration damping force. Furthermore, in this embodiment, a frictional force is generated between the outer circumferential surface of the piston member 4 and the inner circumferential surface of the rubber cylinder member 5, which also contributes to the generation of vibration damping force.

Note that similar effects can be obtained by providing the piston member on the bottom plate and the cylinder member on the top plate.

[0013]

As described above, according to the liquid-filled vibration damping device of the present invention, a sufficient vibration damping force can be exerted with a simple structure, and input vibration can be quickly reduced.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view of a liquid-filled vibration isolator.

FIG. 2 is a perspective view of a piston member.

[Explanation of symbols]

1 Anti-vibration rubber body (chamber wall) 2 Upper plate (vibrating body) 3 Bottom plate (base body) 4 Piston member 41 Liquid flow groove 5 Cylinder member A Liquid chamber

Claims (1)

[Claims] [Claim 1] A liquid chamber sealed with a viscous liquid is formed by a chamber wall that is connected at one end to the vibrating body and at the other end to the base body and deforms as a result of vibration input, and protrudes into the liquid chamber from the vibrating body or the base body. A piston member is provided, and a cylinder member into which the piston member is fitted is provided on the base or vibrating body where the piston member is not provided, and at least one of the cylinder members in the circumferential direction is provided on the outer periphery of the piston member or the inner periphery of the cylinder member. A liquid-filled vibration isolator characterized in that a liquid circulation groove extending in the axial direction is formed in the area.