JPH0674284A - Liquid-filled vibration control device - Google Patents

Abstract

PURPOSE:To provide a high-performance liquid-filled vibration control device suitably usable even in a high temperature atmosphere. CONSTITUTION:A liquid-filled space closed by a rubber elastic body 3 is partitioned by a partition plaste 5 with a throttle passage 51 formed so as to form a pair of liquid chambers A, B. Coil springs 6 are provided between the partition plate 5 and an upper plate 1, and an agitation plate extended inward and outward in the liquid chamber is provided at the intermediate position of the coil spring 6. The static load of a vibrator is supported by the coil springs 6 so as to be hardly applied to the rubber elastic body 3. The rubber elastic body 3 is therefore prevented from being deformed in the distorted state by static load and also prevented from being deteriorated even in a high temperature atmosphere. The rise of a spring constant caused by the resonance of the coil spring in a high frequency vibration region is suppressed by liquid resonance generated by the agitation plate moving rapidly in the vertical direction so as to absorb high frequency vibration desirably.

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]

The structure of the present invention will be described. An upper plate 1 on which a vibrating body is placed, a container-shaped housing 2 fixed to a base body and opened upward, and an outer periphery of the upper plate 1. And a heat-resistant elastic rubber body 3 joined between the opening edges of the housing 2, a rubber film 4 that divides the inner space of the housing 2 into upper and lower parts, and the rubber film 4 and the rubber elastic body 3 are closed. A partition plate 5 which forms a pair of liquid chambers A and B by partitioning the liquid filled space into upper and lower parts and which has a throttle channel 51 communicating between the liquid chambers A and B; a partition plate 5 and an upper plate 1; There is provided a spring member 6 that is installed between the two, and a stirring plate 7 that is integrally provided on the spring member 6 and that extends laterally into the liquid chamber A.

[0006]

In the vibration isolator having the above-described structure, when vibration is input, the upper plate 1 supported by the spring member 6 reciprocates relative to the partition plate 5, resulting in deformation of the elastic rubber body 3 and liquid chamber. The sealing liquid flows through the throttle channel 51 according to the change in the volume of A, and a large vibration damping force is generated. As a result, particularly low frequency large vibrations are effectively reduced.

In the above structure, 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 vibrates and deforms without being distorted by a static load, and since the contribution to the device spring characteristics is smaller than before, heat resistant rubber can be used, so that it deteriorates even in a high temperature atmosphere. There is nothing to do. Further, since the elastic rubber body 3 is not distorted in the statically supported state of the vibrating body, the rubber is not sagged even after long-term use.

When the spring member resonates when high-frequency vibration is input, the spring constant of the apparatus rises, but the stirring plate 7 provided integrally with the spring member 6 rapidly moves to stir the filled liquid in the liquid chamber A, Creates liquid resonance. As a result, an increase in the device spring constant in the high frequency range is suppressed, and an effective vibration absorbing action is maintained.

[0009]

Embodiment 1 FIG. 1 is a vertical cross-sectional view of the device cut at 90 ° different positions in a plane, in which the device has a plate-shaped upper plate 1 and a container-shaped housing 2. 2 is composed of a shallow container-like bottom plate 21 and a cylindrical side plate 22 which is caulked and fixed to the opening edge thereof.

An inner periphery of an elastic rubber body 3 made of a heat resistant rubber material such as EPDM is joined to the entire outer periphery of the upper plate 1,
The outer periphery thereof is joined to the opening edge of the side plate 22.

A partition plate 5 and a rubber film 4 are provided by tightly adhering the outer peripheral edges to the caulked portions of the bottom plate 21 and the side plate 22, and the liquid sealing space closed by the rubber film 4 and the elastic rubber body 3 is a partition plate. It is divided into upper and lower liquid chambers A and B by 5. A groove is formed on the outer peripheral portion of the partition plate 5 to form a throttle channel 51 that connects the liquid chambers A and B.

A liquid chamber A is provided between the upper plate 1 and the partition plate 5 facing each other.
A coil spring 6 is provided inside, and upper and lower ends of the coil spring 6 are fitted and fixed to the convex portion 11 at the center of the lower surface of the upper plate 1 and the convex portion 52 at the center of the upper surface of the partition plate 5.

A stirring plate 7 is provided at an intermediate position of the coil spring 6.
Is provided. The stirring plate 7 is composed of inner and outer annular plates 71, 72 that are substantially circular in plan view and extend inward and outward from the inner and outer circumferences of the coil, respectively.
2 is separated at one position in the circumferential direction, and each outer circumference or inner circumference is welded and fixed to the inner circumference or outer circumference of the coil.

The engine, which is a vibrating body, is connected and fixed to a bolt 81 provided on the upper plate 1, and the vibration isolator is connected and fixed to a vehicle frame, which is a base body, by a bolt 82 penetrating the bottom plate 21.

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
Contracts appropriately to elastically support the load. In this state, the elastic rubber body 3 is substantially in its original shape.

When vibration is input in this state, the upper plate 1 supported by the coil spring 6 moves up and down according to the input vibration, and the sealed liquid flows between the upper and lower liquid chambers A and B through the throttle channel 51. And effective vibration damping.

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

By the way, in the high frequency vibration range of 500 Hz or more, the coil spring 6 resonates, its spring constant increases, and the vibration absorption performance deteriorates. Here, in the configuration of this embodiment, the resonance of the coil spring 6 causes the stirring plate 7 provided thereon to rapidly move up and down to stir the sealed liquid, thereby causing liquid resonance. Due to this liquid resonance, the spring constant of the device is reduced, and the increase in spring constant due to the coil spring 6 is offset, and good vibration absorption performance is maintained.

[0019]

Second Embodiment In FIG. 2, the stirring plate 7 extending from the outer circumference of the coil spring 6 has a ring-shaped weight portion 73 having a circular cross section with a predetermined mass at the outer circumferential portion.
The coil spring 6 constitutes a dynamic damper. In the high-frequency vibration region, however, the device spring constant is reduced by the anti-resonance action of the dynamic damper in addition to the device spring constant reduction by the stirring plate 7, and a good vibration absorption action is exhibited.

[0020]

Third Embodiment As shown in FIG. 3, the coil springs 6A and 6B are divided into upper and lower parts, and an agitating plate 7 is provided between the coil springs 6A and 6B by sandwiching the upper and lower outer peripheral surfaces thereof. Stirring plate 7
Has a thick central portion to form a weight portion 74 having a predetermined mass, and a regulation wall 75 is formed on the outer peripheral edge thereof to prevent lateral displacement of the coil springs 6A and 6B.

Even with this structure, the same effect as that of the above-described second embodiment can be obtained.

[0022]

As described above, according to the liquid-filled anti-vibration device of the present invention, the durability is not deteriorated even in the severe use in the engine room under a high temperature atmosphere, and in the high frequency range. Since the vibration absorption performance of is also favorably maintained, it is possible to effectively prevent transmission of engine vibration in a wide range.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view of an apparatus according to an embodiment of the present invention, where each half of the cross section is cut at 90 ° different positions in a horizontal plane.

FIG. 2 is an overall vertical sectional view of an apparatus showing another embodiment of the present invention.

FIG. 3 is an overall vertical sectional view of an apparatus showing still another embodiment of the present invention.

[Explanation of symbols]

 1 Upper Plate 2 Housing 3 Elastic Rubber Body 4 Rubber Membrane 5 Partition Plate 51 Restricted Flow Path 6 Coil Spring (Spring Member) 7 Stirring Plate A Liquid Chamber B Liquid Chamber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Asano 1 Ochiai character Nagahata, Kasuga-cho, Nishikasugai-gun, Aichi Toyota Synthetic Co., Ltd. (72) Takashi Maeno 1 Ochiai, Nagahata, Kasuga-cho, Nishikasugai-gun, Aichi prefecture In Toyoda Gosei Co., Ltd. (72) Inventor Sadaki Shimoda No. 1 Nagahata, Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi Toyoda Gosei Co., Ltd. (72) Inventor Makoto Goto No. 1 Nagahata, Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture Toyota Synthetic Co., Ltd.

Claims (1)

[Claims] 1. A heat-resistant elastic rubber joined to an outer periphery of the upper plate and an opening edge of the housing, an upper plate on which a vibrating body is mounted, a housing which is fixed to a base body and opens upward. A body, a rubber film that vertically divides the inner space of the housing, 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. A partition plate provided with a throttle channel that communicates with each other, a spring member that is installed between the partition plate and the upper plate, and a stirring plate that is integrally provided on the spring member and extends laterally into the liquid chamber. Liquid-filled anti-vibration device.