JP3123253B2 - Liquid filled vibration isolator - Google Patents

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 isolator,
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 vibration isolator is such that a vibration isolating rubber member constituting a chamber wall of a closed liquid chamber receives a static load of a vibrating member.

[0003]

However, when such a conventional vibration damping device is used as an engine mount in an engine room having a high ambient temperature, the vibration damping rubber body is deformed under a static load. Therefore, there is a problem that fatigue tends to occur. In this case, it is conceivable to use a vibration-proof rubber body having excellent heat resistance, but it has been difficult to use a heat-resistant rubber in relation to required spring characteristics.

An object of the present invention is to solve such a problem, 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]

To explain the structure of the present invention, an upper plate 1 on which a vibrating body is placed, a housing 2 fixed to a base and having a container shape opened upward, and an outer periphery of the upper plate 1 are described. And a heat-resistant elastic rubber body 3 joined between the opening edges of the housing 2, a rubber film 4 for vertically dividing the inner space of the housing 2, and closed by the rubber film 4 and the rubber elastic body 3. A partition plate 5 having a pair of liquid chambers A and B formed by dividing a liquid filling space into upper and lower portions and having a throttle flow path 51 communicating between the liquid chambers A and B; a partition plate 5 and an upper plate 1; And a stirring plate 7 provided integrally with the spring member 6 and extending laterally into the liquid chamber A from the spring member 6.

[0006]

In the vibration isolator of the above construction, when vibration is input, the upper plate 1 supported by the spring member 6 reciprocates relative to the partition plate 5, thereby deforming the elastic rubber body 3 and the liquid chamber. In accordance with the change in the volume of A, the sealing liquid flows through the throttle channel 51 to generate a large vibration damping force. As a result, particularly large vibrations at low frequencies are effectively reduced.

In the above configuration, 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. Never do. Since the elastic rubber body 3 has no distortion in the statically supported state of the vibrating body, the rubber does not set even after long-term use.

When the spring member resonates when high-frequency vibration is input, the spring constant of the apparatus increases. However, the stirring plate 7 provided integrally with the spring member 6 rapidly moves to stir the sealed liquid in the liquid chamber A, Causes liquid resonance. This suppresses an increase in the device spring constant in a high frequency range, and maintains an effective vibration absorbing action.

[0009]

Embodiment 1 FIG. 1 is a longitudinal sectional view of an apparatus cut at a position differing by 90 degrees in a plane. In the figure, the apparatus has a plate-like upper plate 1 and a container-like housing 2; Reference numeral 2 denotes a shallow container-shaped bottom plate 21 and a tubular side plate 22 fixed to the opening edge of the bottom plate 21 by caulking.

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 is joined to the opening edge of the side plate 22.

A partition plate 5 and a rubber film 4 are provided by closely contacting the outer peripheral edges to the caulked portions of the bottom plate 21 and the side plate 22. 5 partition the liquid into upper and lower liquid chambers A and B. A groove is formed in the outer periphery of the partition plate 5 to form a throttle channel 51 that communicates 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 therein, and upper and lower ends of the coil spring 6 are fitted and fixed to a convex portion 11 at the center of the lower surface of the upper plate 1 and a convex portion 52 at the center of the upper surface of the partition plate 5, respectively.

A stirring plate 7 is provided at an intermediate position of the coil spring 6.
Is provided. The agitating plate 7 is composed of inner and outer annular plates 71 and 72 which extend into the liquid chamber A from the inner and outer circumferences of the coil, respectively, and are substantially circular in plan view.
2 is cut off at one location in the circumferential direction, and each outer or inner circumference is welded and fixed to the inner or outer circumference of the coil, respectively.

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 through the bottom plate 21.

In the vibration damping device having the above structure, when a static load is applied with the engine mounted on the upper plate 1, the coil spring 6
Appropriately contract to elastically support the load. In this state, the elastic rubber body 3 becomes substantially the original shape.

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 via the throttle channel 51. And effective vibration damping effect.

In the case of the present device, the spring characteristics of the entire device are determined by the coil spring 6, and the spring characteristics of the elastic rubber body 3 hardly affect the vibration isolating performance. It can be used, and does not deteriorate even when used in a high-temperature atmosphere. This also improves the durability of the device.

By the way, in a high frequency vibration range of 500 Hz or more, the coil spring 6 resonates, its spring constant increases, and the vibration absorbing performance deteriorates. Here, in the configuration of the present embodiment, the stirring plate 7 provided on the coil spring 6 moves up and down rapidly along with the resonance of the coil spring 6 to stir the sealing liquid, thereby generating liquid resonance. Due to this liquid resonance, the spring constant of the device decreases, and the increase in the spring constant by the coil spring 6 is canceled out, so that good vibration absorption performance is maintained.

[0019]

Embodiment 2 In FIG. 2, the stirring plate 7 extending from the outer periphery of the coil spring 6 is a ring-shaped weight portion 73 having a circular cross section with a predetermined mass on the outer circumference.
And the coil spring 6 constitute a dynamic damper. Thus, in the high-frequency vibration range, in addition to the reduction of the device spring constant by the agitating plate 7, the reduction of the device spring constant is realized by the anti-resonance effect of the dynamic damper, and a satisfactory vibration absorbing effect is exhibited.

[0020]

Third Embodiment As shown in FIG. 3, the coil springs 6A and 6B are divided into upper and lower portions, and a stirring plate 7 is provided between the coil springs 6A and 6B so as to sandwich the upper and lower portions of the outer peripheral surface. Stir plate 7
The center portion is thickened to form a weight portion 74 having a predetermined mass, and a regulating wall 75 is formed on the outer peripheral edge to prevent lateral displacement of the coil springs 6A and 6B.

With this structure, the same effect as in the second embodiment can be obtained.

[0022]

As described above, according to the liquid-filled vibration damping device of the present invention, the durability is not reduced even by severe use in an engine room or the like under a high-temperature atmosphere. , The vibration absorption performance of the engine can be maintained satisfactorily, so that transmission of a wide range of engine vibration can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is an overall vertical cross-sectional view of an apparatus showing one embodiment of the present invention, wherein each half of the cross section is cut at a position different by 90 degrees 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]

 Reference Signs List 1 upper plate 2 housing 3 elastic rubber body 4 rubber film 5 partition plate 51 throttle channel 6 coil spring (spring member) 7 stirring plate A liquid chamber B liquid chamber

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takashi Maeno 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. No. 1 Toyoda Gosei Co., Ltd. (72) Inventor Masanori Goto Nagahata Ochiai, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture No. 1 Toyoda Gosei Co., Ltd. (56) References JP-A-5-10382 (JP, A) JP-A-5 -10383 (JP, A) JP-A-6-2735 (JP, A) JP-A-58-30049 (JP, U) JP-A-2-107851 (JP, U) (58) Fields investigated (Int. . ^7, DB name) F16F 13/10 B60K 5/12

Claims (1)

(57) [Claims] 1. An upper plate on which a vibrating body is mounted, a housing in the form of a container fixed to a base and opened upward, and a heat-resistant elastic rubber joined between an outer periphery of the upper plate and an opening edge of the housing. Body, a rubber film partitioning the inner space of the housing up and down, and a liquid sealing space closed by the rubber film and the rubber elastic body partitioning up and down to form a pair of liquid chambers, and a space between these liquid chambers. A partition plate provided with a throttle flow path communicating with the spring plate, a spring member provided between the partition plate and the upper plate, and a stirring plate provided integrally with the spring member and extending laterally into the liquid chamber from the spring member. A liquid filled vibration isolator provided.