JPH0617873A - Liquid-filled vibration control device - Google Patents

Abstract

PURPOSE:To provide a liquid-filled vibration control device of high performance 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 plate 5 with a throttle passage 51 formed therein so as to form a pair of liquid chambers A, B. A coil spring 6 is provided between the partition plate 5 and an upper plate 1, and the lower end of the coil spring 6 is fixed to a receiving member 7 sliding on the recessed spherical face 5a of the partition plate 5. Since the static load of a vibrator is suppoted by the coil spring so as to be hardly applied to the rubber elastic body 3, the rubber elastic body 3 is not deformed in the distorted state by the static load nor degraded even in a high temperature atmosphere because of the use of heat resisting rubber. Also, even when the attitude of the vibrator changes to cause the change of the opposed attitude of the upper plate 1 to the partition plate 5, the coil spring 6 is rotated around a fixed point C at one end without changing its attitude to the upper plate 1. Vibration is thereby always inputted to the coil spring 6 from the axial direction to avoid the lowering of its durability.

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]

To explain the structure of the present invention, a liquid filled vibration isolator comprises an upper plate 1 on which a vibrating body is placed, and a container-like housing 2 fixed to a base body and opened upward.
A heat-resistant elastic rubber body 3 joined between the outer periphery of the upper plate 1 and the opening edge of the housing 2, a rubber film 4 for vertically partitioning the inner space of the housing 2, and the rubber film 4 and A partition plate 5 which defines a pair of liquid chambers A and B by partitioning a liquid-filled space closed by a rubber elastic body 3 into upper and lower parts, and which has a throttle channel 51 communicating between these liquid chambers A and B; Partition plate 5
And a spring member 6 installed between the upper plate 1 and the spring member 6. One end of the spring member 6 is fixed to the upper plate 1, and the plate surface 5a of the partition plate 5 is fixed to the spring member 6. A receiving member 7 which is formed into a concave curved surface having a center O at a fixing point at one end and is slidable along the concave curved surface is provided, and the other end of the spring member 6 is fixed to the receiving member 7.

[0006]

In the vibration isolator having 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 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 has no distortion in the vibrating body supporting state, the rubber is not settled even after long-term use.

The vibrating body placed on the upper plate 1 does not always have the same posture, and the posture and the vibration input direction change. In this case, if a load from a direction other than the axial direction is applied to the spring member 6, its durability becomes a problem. Here, according to the above configuration, when the posture of the vibrating body is changed and the facing posture of the upper plate 1 with respect to the partition plate 5 is changed, the spring member 6 and the receiving member 7 having the other end fixed thereto are separated by the partition plate. Since it slides along the concave curved surface 5a of No. 5, it rotates about the fixed point O at one end and does not change its posture with respect to the upper plate 1. Thereby, the vibration from the vibrating body is always input to the spring member 6 from the axial direction,
As a result, deterioration of the durability of the spring member 6 is avoided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional view of the device cut at 90 ° different positions in a plane. In the drawing, the device is a plate-shaped upper plate 1.
And a housing 2 having a container shape, and the housing 2 is composed of a shallow container-shaped bottom plate 21 and a cylindrical side plate 22 caulked and fixed to an opening edge of the housing.

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 elastic rubber body 3 has a slightly thin, substantially J-shaped cross section that turns downward after turning downward, and 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 surface of the partition plate 5 to form a throttle channel 51 communicating with the liquid chamber, and an upper surface 5a of the partition plate 5 facing the upper plate 1 is a concave spherical surface. The center of this spherical surface is at the center O of the upper plate 1.

A receiving member 7 shaped to follow the concave spherical surface 5a is slidably provided on the partition plate 5, and its outer peripheral portion has a thick frame having an outer wall 71 and a flat receiving surface 72. It is a division. A coil spring 6 is provided between the receiving surface 72 of the receiving member 7 and the upper plate 1 so as to vertically cut the main liquid chamber A.

The upper end of the coil spring 6 is fixed in an annular groove 11 formed around the center of the lower surface of the upper plate 1.
That is, the inner diameter of the coil spring 6 is slightly smaller than the inner diameter of the annular groove 11, and the upper end of the coil spring 6 is press-fitted and fixed in the annular groove 11 while being expanded and deformed. Coil spring 6
The lower end of is fixed to the receiving member 7, and the outer diameter of the lower end is set to the outer wall 1.
The inner diameter of the outer wall 11 is slightly larger than the inner diameter of the first wall 1, and the inner wall of the outer wall 11 is press-fitted and fixed while being deformed.

The engine, which is a vibrating body, is connected and fixed by a bolt 81 penetrating the upper plate 1, and the vibration isolator is a bottom plate 2.
It is connected and fixed to a vehicle frame which is a base body by a bolt 82 penetrating through 1.

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 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 51. And effective vibration damping. In this case, since the elastic rubber body 3 has a J-shaped cross section as described above, even if the elastic rubber body 3 is repeatedly deformed in response to a vibration input, almost no internal stress is generated and durability is not deteriorated. Further, such a shape can sufficiently withstand an increase in the internal pressure of the main liquid chamber A.

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 isolation 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.

When the posture of the engine changes during vibration, the facing posture of the upper plate on which the engine is placed with respect to the partition plate 5 changes in inclination. Since the receiving member 7 to which the lower end of the coil spring 6 is fixed is slidable along the concave spherical surface 5a of the partition plate 5,
With the inclination of the upper plate 1, the coil spring 6 rotates about the center O of the upper plate 1 which coincides with the center point of its upper end. This allows
The relative posture of the coil spring 6 with respect to the upper plate 1 does not change, and the vibration from the engine is always input to the coil spring 6 from the axial direction. As a result, there is no problem that the lateral force acts on the coil spring 6 and the durability thereof is reduced.

Further, according to the structure of this embodiment, both the upper and lower ends of the coil spring 6 are fixed by press fitting.
It can be fixed more easily than welding or caulking.

When the change in the attitude of the engine is made within a constant vertical plane, the plate surface 5a of the partition plate 5 may be an arc surface.

[0020]

As described above, according to the anti-vibration device of the present invention, durability is not deteriorated even under severe use in an engine room under a high temperature atmosphere, and it is suitable for an engine mount or the like. Can be used.

[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 2 Housing 3 Elastic Rubber Body 4 Rubber Film 5 Partition Plate 5a Plate Surface 51 Throttling Flow Path 6 Coil Spring (Spring Member) 7 Receiving Member A Liquid Chamber B Liquid Chamber O Top Center (One End Fixed Point)

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, and a spring member provided between the partition plate and the upper plate, the spring member fixing one end of the spring member to the upper plate,
The plate surface of the partition plate is formed into a concave curved surface centered on one end fixing point of the spring member, and a receiving member that is slidable along the concave curved surface is provided, and the other end of the spring member is fixed to the receiving member. A liquid-filled anti-vibration device characterized in that