JPH062735A - Liquid sealing type vibration control device - Google Patents

Abstract

PURPOSE:To show satisfactory characteristic even under high-temperature atmosphere and a severe application condition. CONSTITUTION:An upper plate 1 is provided oppositely to a bottom plate 2, and a side plate 7. An elastic rubber body 3 is arranged for connecting an outer periphery of the upper plate 1 to an opening edge of the side plate 7. A lower side of a partition plate 5 is sealed with a rubber film 4. An inner space is divided, by the partition plate 5, into upper and lower liquid chambers A, B which are communicated with each other through a throttle flow passage 52. A coil spring 6 is arranged in the liquid chamber A between the partition plate 5 and the upper plate 1. A rubber guide groove 12 is formed on a lower surface of the upper plate 1, through which a part of the elastic rubber body 3 reaches an outer periphery of a head 81 of a fixing bolt 8 piercing the upper plate 1. A seal rubber layer 31 for covering the head 81 is thus formed. A spring constant of the device is determined by the coil spring 6. The elastic rubber body 3, without restriction of the spring characteristic, is composed of heat- resistant rubber material, so that the body has durability even under high-temperature atmosphere. It is unnecessary to provided an independent seal member with the presence of the seal rubber layer 31, so that the sealing of the bolt-piercing part is facilitated.

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 vibration isolator having excellent durability at high temperatures.

[0002]

2. Description of the Related Art In general, the structure of a liquid-filled anti-vibration device is one in which an anti-vibration rubber body forming a chamber wall of a sealed liquid chamber receives a static load of the vibrating body.

[0003]

However, when the vibration isolator having such a conventional structure is used as an engine mount in an engine room where the ambient temperature is high, the vibration isolating rubber body is vibrated and deformed under a static load distortion. Therefore, there is a problem that fatigue easily occurs. In this case, it is possible to use a vibration-proof rubber body having excellent heat resistance, but it was difficult to use the heat-resistant rubber due to the required spring characteristics.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a high-performance liquid-filled vibration isolator which can be suitably used even in a high temperature atmosphere.

[0005]

A liquid filled vibration isolator according to the present invention comprises an upper plate 1 on which a vibrating body is mounted, a container-shaped bottom plate 2 which opens upward, and an entire outer peripheral edge of the upper plate 1. A heat-resistant elastic rubber body 3 disposed jointly between the circumference and the entire circumference of the bottom plate 2 opening edge,
A rubber film 4 for vertically partitioning the inner space of the bottom plate 2 and a liquid-filled space closed by the rubber film 4 and the rubber elastic body 3 are vertically partitioned to form a pair of liquid chambers A and B. A partition plate 5 provided with a throttle channel 52 communicating between the liquid chambers A and B, and a spring member 6 installed between the partition plate 5 and the upper plate 1.
The upper plate 1 is provided with a fixing bolt 8 which penetrates the upper plate 1 from below and extends upward to fix the vibrating body. The fixing bolt 8 is provided from the outer peripheral edge of the upper plate 1.
Of the rubber material of the elastic rubber body 3 introduced through the rubber guide groove 12 is formed so as to cover at least the penetration portion of the fixing bolt 8 in a liquid-tight manner. The seal rubber layer 31 is formed.

[0006]

In the vibration isolator having the above construction, the static load of the vibrating body is supported by the spring member 6 and is hardly applied to the elastic rubber body 3. Therefore, the elastic rubber body 3 is not deformed in a state in which it is distorted by a static load, and since the contribution to the device spring characteristics is smaller than that of the conventional one, a heat resistant rubber can be used, so that it can be used in a high temperature atmosphere. However, it does not deteriorate. Further, since the elastic rubber body 3 is not distorted when the engine is mounted, the rubber does not become tired even after long-term use.

Further, since the rubber guide groove 12 forms the elastic rubber body 3 and at the same time a part of the rubber material reaches the penetrating portion of the fixing bolt 8 to form the seal rubber layer 31, a separate seal member is provided. No need.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of the apparatus cut at 90 ° different positions in a plane. In the figure, the apparatus comprises a thick plate upper plate 1 and a shallow container-like bottom plate 2 opening upward. Have
A lower end opening edge of a cylindrical side plate 7 is caulked and fixed to the outer periphery of the bottom plate 2.

The outer periphery of the lower surface of the upper plate 1 serves as a restriction wall 11 projecting downward, and a relatively thick wall having a substantially J-shaped cross section is formed between the entire circumference of the restriction wall 11 and the inner circumference of the upper end opening of the side plate 7. The thin elastic rubber body 3 is joined. The elastic rubber body 3 is made of a heat resistant rubber material such as EPDM and has the above-described cross-sectional shape, so that it has a long free length with respect to a vibration input in the vertical direction, a small spring constant, and a large expansion spring constant.

A fixing bolt 8 is driven into the upper plate 1 from below in a through hole penetrating the thick portion 13 at the center,
A nut is connected to the threaded portion protruding upward to fix a vibration body such as an engine. On the lower surface of the upper plate 1, at a plurality of positions in the circumferential direction, there are thicker parts 13 than the part in contact with the base part of the restriction wall 11.
Of the rubber material of the elastic rubber body 3 extends to the outer periphery of the large-diameter head 81 of the fixing bolt 8 through the rubber guide groove 12 to form a head portion. 81
The seal rubber layer 31 covers the whole.

That is, when the elastic rubber body 3 is molded, the upper plate 1 is positioned by the mold wall which is in contact with the lower surface thereof and the side wall of the thick portion 13. In this state, the main cavity between the upper plate 1 and the side plate 7 for molding the elastic rubber body 3 has the above-mentioned rubber guide groove 1
When the rubber material is injected into the main cavity through the outer cavity of the bolt head 81 by means of 2, a part of the rubber material reaches the outer periphery of the bolt head 81 through the rubber guide groove 12, and the seal rubber layer 3
It becomes 1.

A cover-shaped stopper plate 14 is mounted on the upper plate 1, and its radially opposed portion is bent downward to extend,
The stopper rubber 71 provided on the upper end of the side plate 7 is opposed to the stopper rubber 71 in the vertical direction and the horizontal direction at predetermined intervals.

A partition plate 5 and a rubber film 4 are provided by tightly adhering the outer peripheral portion to the opening edge of the bottom plate 2, and the liquid sealing space closed by the rubber film 4 and the elastic rubber body 3 is vertically moved by the partition plate 5. It is divided into liquid chambers A and B. A groove is formed on the outer periphery of the partition plate 5, and the space inside the groove closed by the side plate is a throttle channel 52 of a constant length that connects the liquid chambers A and B.

A central portion of the partition plate 5 is projected upward as a whole, and the protruding stepped surface 51 as a horizontal deviation restricting portion.
The inner periphery of the lower end of the coil spring 6 is in contact with the iron ring-shaped sheet 61 having an L-shaped cross section. The lower end surface of the coil spring 6 abuts on the upper surface of the partition plate 5 via the sheet 61, and the upper end thereof abuts on the lower surface of the upper plate 1 to form the thick wall portion 13 and the restriction wall 11.
The horizontal deviation is regulated by.

The upper plate 1, the bottom plate 2, the partition plate 5 and the like are made of a lightweight aluminum material or resin material.

In the vibration isolator having the above structure, when the engine is placed on the upper plate 1 and a static load is applied, the coil spring 6
Properly contracts to elastically support the load, and in this state, the elastic rubber body 3 takes the horizontal posture shown in the drawing with almost no deformation and no distortion occurs.

When vibration is input in this state, the upper plate 1 supported by the coil spring 6 moves up and down in response to the input vibration, and the sealing liquid flows between the upper and lower liquid chambers A and B through the throttle channel 52. And effective vibration damping. In this case, since the elastic rubber body 3 has almost no initial strain, the durability is not deteriorated even if it is repeatedly deformed in response to a vibration input.

In the case of this apparatus, the spring characteristic of the entire apparatus is determined by the coil spring 6, and the spring characteristic of the elastic rubber body 3 has almost no effect on the vibration isolation performance. It can be used and does not deteriorate even when used in a high temperature atmosphere, which also improves the durability of the device.

Further, since the rubber guide groove 12 forms the elastic rubber body 3 and at the same time a part of the rubber material reaches the entire circumference of the head 81 of the fixing bolt 8 to form the seal rubber layer 31, a seal ring or the like is formed. The liquid tightness of the bolt penetration portion can be maintained without providing a separate seal member.

The seat 61 prevents abrasion of the partition plate 5 due to friction when the coil spring 6 is deformed.

[0021]

As described above, according to the anti-vibration device of the present invention, the durability is not deteriorated even by the severe use in the engine room under a high temperature atmosphere, and the vibration fixing bolt is penetrated. The liquid seal of the part can be easily made.

[Brief description of drawings]

1 is an overall vertical cross-sectional view of the device, with each half of the cross-section taken at 90 ° different positions in the horizontal plane.

[Explanation of symbols]

 1 Upper Plate 12 Rubber Guide Groove 2 Bottom Plate 3 Rubber Elastic Body 31 Seal Rubber Layer 4 Rubber Film 5 Partition Plate 52 Throttling Channel 6 Spring Member 8 Fixing Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazutoshi Miyake 1 Ochiai, Nagachi, Kasuga-cho, Nishikasugai-gun, Aichi Toyota Gosei Co., Ltd. Toyota Synthetic Co., Ltd. (72) Inventor Matsuoka Main tax 1 Toyota-cho, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Kazuhiro Horikoshi 1-cho, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) ) Inventor Yuichi Hirata 1-29 Tobe-cho, Minami-ku, Nagoya-shi, Aichi

Claims (1)

[Claims] 1. A heat-resistant material, which is joined to an upper plate on which a vibrating body is placed, a container-shaped bottom plate that opens upward, and an outer peripheral edge of the upper plate and an entire peripheral edge of an opening edge of the bottom plate. Elastic rubber body of
A rubber film that vertically divides the inner space of the bottom plate and a liquid-filled space that is closed by the rubber film and the rubber elastic body are vertically divided to form a pair of liquid chambers, and the liquid chambers communicate with each other. A partition plate provided with a throttle channel, and a spring member laid between the partition plate and the upper plate, wherein the upper plate extends upward from the lower plate through the upper plate. A fixing bolt for fixing is provided, and a rubber guide groove extending from the outer peripheral edge of the upper plate to the vicinity of the penetrating portion of the fixing bolt is formed, and one of the rubber members of the elastic rubber body introduced through the rubber guide groove. A liquid-filled vibration damping device, characterized in that a seal rubber layer is formed so as to cover at least the fixing bolt penetrating portion in a liquid-tight manner.