JPH06137366A - Liquid sealed vibration control device - Google Patents

Abstract

PURPOSE:To provide a liquid sealed vibration control device by which liquidtightness is not deteriorated even if large lateral force is operated to a partition plate. CONSTITUTION:Ribs 34 projecting outward in a diametrical direction are formed in plural positions in the circumferential direction on the outer peripheral surface of a lower half part 33 of a partition plate 3. The partition plate 3 is inserted forcibly in a condition where the ribs 34 are brought into pressure contact with the inner peripheral surface of a lower end part 42 of a side plate 4, and the lower half part 33 of the partition plate is calked and fixed by the lower end of the side plate 4. The outer periphery of an upper half part 32 of the partition plate 3 is brought into close contact with a sealing rubber layer 11 formed on the inner peripheral surface of a general part 41 of the side plate. Since the partition plate 3 is not dislocated even if large lateral force is operated, a close contact condition is kept between the outer periphery of the upper half part 32 of the partition plate and the sealing rubber layer 11, so that liquidtightness is maintained.

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,
Particularly, the present invention relates to a structural improvement of a liquid-filled vibration isolator having excellent liquid-tightness.

[0002]

2. Description of the Related Art A liquid-filled anti-vibration device exhibits anti-vibration effects by allowing a fluid to flow between a pair of liquid chambers that are deformed in response to a vibration input through a throttle channel. A rubber body is bonded to the upper end opening of the cylindrical side plate to cover the rubber body and form a chamber wall of the main liquid chamber that supports the vibrating body. The partition plate is inserted into the side plate, the lower half of the partition plate having the large diameter is positioned in the lower end of the side plate having the large diameter, and the side plate opening edge is caulked and fixed to close the main liquid chamber.

By the way, the outer diameter of the lower half of the partition plate is made slightly smaller than the inner diameter of the lower end of the side plate for easy assembly, and a gap is created between them, so that the upper half of the small diameter of the partition plate is formed. A seal rubber layer having a constant thickness is formed on the inner circumference of the side plate, which is in contact with the outer circumference of the part, to secure the liquid tightness of the main liquid chamber.

[0004]

However, for the purpose of enabling use especially in a high temperature atmosphere, a spring member for supporting the static load of the vibrator is provided in the main liquid chamber, and one end of the spring member is used as a partition plate. When the structure is fixed, if a lateral force larger than that of the spring member is input, the partition plate will shift at the caulking part, and the closeness between the seal rubber layer and the upper half of the partition plate will decrease on the side opposite to the displacement direction, resulting in a large internal pressure. There is a concern that the liquid tightness of the fluctuating main liquid chamber may decrease.

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 cause deterioration of liquid tightness even when a large lateral force is applied to a partition plate.

[0006]

To explain the constitution of the present invention, a main liquid chamber A for supporting a vibrating body and a sub liquid separated from the main liquid chamber A by a partition plate 3 in which a throttle channel F is formed. The liquid chamber of the main liquid chamber A is constituted by the rubber body 1 which is provided with the chamber B and is joined to the upper end opening edge of the cylindrical side plate 4 to close it, and the partition plate 3 is inserted into the side plate 4. In the liquid-filled anti-vibration device configured to close the lower end opening thereof, ribs projecting radially outward at a plurality of circumferential positions on the outer peripheral surface of the lower half portion 33 having a large diameter on the partition plate 3. Forming 34,
The partition plate 3 has a lower end portion 42 in which the side plate 4 has a large diameter.
The rib 34 is press-fitted to the inner peripheral surface in a pressed state, and the lower half portion 33 of the partition plate is caulked and fixed by the lower end edge of the side plate 4,
Moreover, the outer periphery of the upper half portion 32 of the partition plate 3 is in close contact with the seal rubber layer 11 formed on the inner peripheral surface of the side plate general portion 41.

[0007]

In the above structure, since a plurality of ribs 34 are formed on the outer peripheral surface of the lower half portion 33 of the partition plate 3 and the ribs 34 are pressed into the lower end portion 42 of the side plate 4 without any gap, a large lateral force acts. Even if the partition plate 3 is not displaced. Therefore, the close contact between the outer periphery of the upper half 32 of the partition plate and the seal rubber layer 11 is maintained, and the liquid tightness is maintained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional view of a vibration isolator cut at 90 ° different positions in a plane. The device is a container-shaped bottom plate 5 that opens upward, and is caulked to the outer peripheral edge of the bottom plate 5. It has a cylindrical side plate 4, and the upper end opening of the side plate 4 is covered with a ring-shaped rubber body 1 made of a heat-resistant rubber material such as EPDM whose outer periphery is joined to the opening edge. The rubber body 1 is relatively thin,
The inner peripheral edge is joined to the outer periphery of the upper plate 6, while the lower end opening of the side plate 4 is closed by a partition plate 3 whose details will be described later to form a main liquid chamber A.

A thin rubber film 2 is provided by closely contacting the outer peripheral edge of the outer peripheral surface of the partition plate 3, and a space closed by the rubber film 2 serves as a sub liquid chamber B.

The partition plate 3 is formed by bending a thin central portion upward so as to bend upward, and a lower end is fitted and fixed to the outer periphery of the protruding portion 35, and a coil spring 7 is provided in the main liquid chamber A. The upper end of the coil spring 7 is fitted and fixed in the annular groove 61 on the lower surface of the upper plate 6.

The outer peripheral portion of the partition plate 3 is thick, and the lower half portion 33 thereof has a large diameter. As shown in FIG. 2, on the outer peripheral surface of the lower half portion 33, ribs 34 having an arc cross section and projecting outward are formed at four locations in the circumferential direction. The upper half 31 having a small diameter of the partition plate 3 is formed with a groove 31 that opens to the side almost all around the outer circumference. With the partition plate 3 positioned inside the side plate 4, The outer peripheral surface of the upper half portion 31 is in close contact with the seal rubber layer 11 having a constant thickness extending from the rubber body 1 to the inner periphery of the general portion 41 of the side plate 4, and the groove 31 is closed to form the throttle channel F. The throttle channel F has one end opening to the main liquid chamber A and the other end opening to the sub liquid chamber B.

The side plate 4 has a large diameter with a lower end portion 42 protruding stepwise to the side, and each rib 34 of the partition plate 3 is formed.
The diameter connecting the projecting ends of is slightly larger than the inner diameter of the lower end portion 42. Then, when the partition plate 3 is fitted into the side plate 4, when the lower half portion 32 of the partition plate 3 is press-fitted by pushing the lower end portion 42 of the partition plate 3, the tip of each rib 34 causes the lower end portion 42 of the side plate to fall. The inner peripheral surface of the is pressed and positioned. The positioned partition plate 3 is fixed together with the rubber film 2 and the bottom plate 5 by caulking the lower edges of the side plates inward.

In such an antivibration device, the bottom plate 5 is fixed to the base body by bolts, and the vibrating body is placed on the upper plate 6 and bolted. The space inside the bottom plate 5 below the rubber film 2 communicates with the outside air through an air hole 51.

When the device is used, a large lateral force (horizontal direction) is applied to the partition plate 3 having the lower end of the coil spring 7 fixed by vibration input.
The rib 34 formed on the outer periphery of the rib 34
With this, the partition plate 3 is reliably positioned, and lateral deviation does not occur. Therefore, the close contact between the outer periphery of the upper half part 32 of the partition plate and the seal rubber layer 11 is maintained well and the liquid tightness is maintained.

[0015]

As described above, according to the liquid filled vibration damping device of the present invention, the lateral displacement of the partition plate can be surely prevented with a simple structure, and in particular, the spring member for supporting the static load is provided in the main liquid chamber. The liquid-tightness can be kept good by applying it to an anti-vibration device or the like.

[Brief description of drawings]

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

FIG. 2 is an overall perspective view of a partition plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber body 2 Rubber film 3 Partition plate 31 Groove 32 Upper half part 33 Lower half part 34 Rib 4 Side plate 41 General part 42 Lower end part A Main liquid chamber B Sub liquid chamber F Throttling flow path

Claims (1)

[Claims] 1. A main liquid chamber for supporting a vibrating body, and a sub liquid chamber partitioned from the main liquid chamber by a partition plate having a throttle channel formed therein. The sub liquid chamber is joined to an upper opening edge of a cylindrical side plate. The rubber chamber that closes the lever constitutes the liquid chamber of the main liquid chamber,
In the liquid-filled vibration isolator in which the partition plate is inserted into the side plate to close the lower end opening thereof, the partition plate has a large diameter on the outer peripheral surface of the lower half portion at a plurality of circumferential positions. A rib protruding outward in the direction is formed, and the partition plate is press-fitted in such a manner that the rib is pressed against the inner peripheral surface of the lower end of the side plate having a large diameter, and the lower half of the partition plate is pressed by the lower end edge of the side plate. A liquid-filled vibration damping device, characterized in that the outer periphery of the upper half portion of the partition plate is caulked and fixed, and the outer periphery of the upper half portion of the partition plate is brought into close contact with a seal rubber layer formed on the inner peripheral surface of the general side plate portion.