JPH0510383A - Liquid-sealed vibration-proof device - Google Patents

Abstract

PURPOSE:To provide good vibration damping force with a simple structure by forming a coil spring with a pipe material, opening one end of the space in the pipe to an upper liquid chamber, and opening the other end to a lower liquid chamber through a partition plate to form an orifice passage. CONSTITUTION:A container-shaped upper housing 1, a lower housing 2, and a side plate 3 are provided with openings faced to each other, and a rubber elastic body 4 is connected between the side wall 11 of the upper housing 1 and the side plate 3. The lower section of a partition plate 6 is sealed with a rubber film 5, and the inside is divided into upper and lower liquid chambers A, B. A coil spring 7 is provided in the liquid chamber A between the partition plate 6 and the upper housing 1. The coil panel 7 is made of a pipe material, one end of the space 7a in the pipe is opened to the upper liquid chamber A, the other end is opened to the lower liquid chamber B through the partition plate 6 to form an orifice passage, and good vibration damping force is generated.

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,
The structure of the device having durability is simplified.

[0002]

2. Description of the Related Art A general structure of a liquid-filled anti-vibration device has a pair of liquid chambers partitioned by a partition plate which forms a throttle channel.
A vibration damping force is generated by causing a fluid to flow through the throttle channel in response to the vibration input. In such an anti-vibration device, the static load of the vibrating body is supported by the coil spring, the selection range of the rubber material of the rubber elastic body forming the chamber wall of the liquid chamber is widened, and good absorption of high-frequency microvibration is achieved. Kaisho 56-
160220) or a rubber elastic body having improved durability.

[0003]

By the way, the structure of the conventional liquid-filled vibration isolator is relatively complicated in itself because the throttle passage is formed in the partition plate, and it is not possible to install a coil spring therein. Further, the structure is complicated, which causes a cost increase.

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 that does not complicate the structure even if a coil spring is built therein.

[0005]

To explain the structure of the present invention, a liquid-filled vibration isolator comprises an upper housing 1 having a container shape that opens downward and a container shape that opens upward, and a side wall 3 thereof has the above-mentioned structure. The lower housing 2 facing the side wall 11 of the upper housing 1 at a distance in the horizontal direction, the rubber elastic body 4 joined between the side walls 11 and 3 of the entire circumference of the housings 1 and 2, and the lower housing 2 A rubber film 5 that divides the inner space into upper and lower parts; a partition plate 6 that divides the liquid filled space closed by the rubber film 5 and the rubber elastic body 4 into upper and lower parts to form a pair of liquid chambers A and B; The coil spring 7 is provided between the partition plate 6 and the top wall 12 of the upper housing 1. The coil spring 7 is made of a pipe material so that one end of the pipe inner space 7a is opened to the upper liquid chamber A and The end penetrates the partition plate 6 and the lower liquid chamber It is obtained without a throttle flow path brought open to.

[0006]

In the apparatus having the above construction, since the static load of the vibrating body is supported by the coil spring 7, the initial strain of the rubber elastic body 4 is small and the durability is improved. Since the coil spring 7 is made of a pipe material and the internal space 7a thereof is used as a throttle channel, it is not necessary to form the throttle channel by the work in the partition plate 6,
Simplification of production assembly and structure is realized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, an upper housing 1 is in the form of a container that expands downward in a stepped manner. Lower housing 2
Has a shallow container shape, and a cylindrical side plate 3 is caulked and fixed to the outer periphery thereof. The side plate 3 is the side wall 1 of the upper housing 1.
1 extends outward with a space, and the upper end opening edge is bent inward to form a stopper 31.

The upper housing 1 is covered with a rubber layer,
A part of it becomes a rubber elastic body 4 which extends outward in a horizontal posture and is fixed by caulking along the inner circumference of the side plate 3
Is joined to. The rubber elastic body 4 is made of a heat resistant rubber material such as EPDM. A partition plate 6 is provided by partitioning the inner space of the side plate 3 into upper and lower parts, and the partition plate 6 has a central portion 61 protruding upward.

Below the partition plate 6 is a rubber film 5 along the partition plate 6.
Is provided, and the outer periphery of the rubber film 5 is in close contact with the lower surface of the partition plate 6. Then, the liquid is enclosed in the space sealed by the rubber elastic body 4 and the rubber film 5, and the main liquid chamber A is formed above the partition plate 6 and the sub liquid chamber B is formed below the partition plate 6.

A coil spring 7 is provided between the partition plate 6 and the top wall 12 of the upper housing 1, and the coil spring 7 is made of a metal pipe material. The coil spring 7 is positioned such that the inner periphery of the lower end is in contact with the outer periphery of the center portion 61 of the partition plate 6 and the outer periphery of the upper end is in contact with the stepped surface of the top wall 12. The upper end of the pipe inner space 7a of the coil spring 7 is opened to the upper liquid chamber A, and the lower end is opened to the sub liquid chamber B through the through hole 62 of the partition plate 6 to form a throttle channel.

A bolt 13 for fixing an engine, which is a vibrating body, is erected on a top wall 12 of the upper housing 1, and a dust cover 14 having an opening through which the bolt 13 is inserted is placed on the top wall 12. There is. The lower housing 2 is fixed to a vehicle frame as a base body by a bolt 21 provided at the center.

In the vibration isolator having such a structure, since the static load of the engine is supported by the coil spring 7, the spring characteristics of the rubber elastic body 4 can be selected from a wide range, and a rubber material excellent in heat resistance is used. This makes it possible to use it in a high temperature atmosphere.

When a static load is applied, the rubber elastic body 4 assumes the horizontal posture shown in the drawing with almost no deformation and distortion. When vibration is input in this state, the upper housing 1 moves up and down relatively and the volume of the main liquid chamber A is increased. Change. Along with this volume change, the sealing fluid flows between the upper and lower liquid chambers A and B through the throttle channel 7a formed in the coil spring 7, and exerts a large vibration damping force to rapidly reduce vibration.

In such an operation, since the rubber elastic body 4 has almost no initial strain, it exhibits sufficient durability against repeated deformation due to vibration input. Further, since the throttle flow passage 7a is formed in the spiral coil spring 7, it is possible to secure a sufficiently long flow passage without performing a complicated work on the partition plate 6, simplifying the structure and vibrating damping performance. Is also realized.

When excessive vertical vibration is input, the stepped portion of the upper housing 1 abuts the stopper 31 of the side plate 3, or the lower end of the side wall 11 of the housing 1 abuts the partition plate 6 surface, and The movement of the rubber elastic body 1 is restricted, and the rubber elastic body 4 is prevented from being excessively deformed.

[0016]

As described above, according to the liquid filled vibration damping device of the present invention, the durability is not deteriorated even in a high temperature environment, and a good vibration damping force can be obtained with a simple structure.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view of an apparatus showing an embodiment of the present invention.

[Explanation of symbols]

 1 Upper Housing 11 Side Wall 12 Top Wall 2 Lower Housing 3 Side Plate (Side Wall) 4 Rubber Elastic Body 5 Rubber Membrane 6 Partition Plate 62 Through Hole 7 Coil Spring 7a Pipe Space A, B Liquid Chamber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazutoshi Miyake No. 1 Nagahata, Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi Toyota Gosei Co., Ltd. Within Toyoda Gosei Co., Ltd. (72) Inventor Matsuoka Main tax 1 Toyota-cho, Toyota-shi, Aichi Within Toyota Motor Corporation (72) Yuichi Hirata 1-29 Tobe-cho, Minami-ku, Nagoya-shi, Aichi

Claims (1)

Claim: What is claimed is: 1. A container-shaped upper housing that opens downward, and a container-shaped housing that opens upward, the side wall of which faces the side wall of the upper housing at a horizontal interval. Side housing, a rubber elastic body joined between all side walls of these housings, a rubber film for vertically dividing the inner space of the lower housing, and a liquid filled space closed by the rubber film and the rubber elastic body. A partition plate that divides the partition into upper and lower parts to form a pair of liquid chambers, and a coil spring erected between the partition plate and the top wall of the upper housing. A liquid-filled anti-vibration device, characterized in that one end of the space is opened to the upper liquid chamber, and the other end is penetrated through the partition plate to be opened to the lower liquid chamber to form a throttle channel.