JPH04312232A - Liquid seal vibration isolating device - Google Patents

Abstract

PURPOSE:To establish vibration damping force in a wide range without the occorrence of damage caused by the mutual interference of constructing members. CONSTITUTION:A liquid chamber A having a chamber wall formed of a rubber vibration insulator 1 to support a vibration body is formed, and a silicon oil is enclosed in its inside. A supporting bar 4 extends from an upper plate 2 into the liquid chamber (A) and a stirring plate 5 is fixed to the tip of the bar 4. The liquid chamber is provided with a partitioning plate 6 to vertically divide the chamber, and an opening edge where the supporting bar 4 passes through is formed into a cylindrical part 61. A soft rubber material layer 62 having fixed thickness is joined to the inner periphery of the cylindrical part, and liquid circulating gaps P having a length of (h) are formed at the intervals (d) between the above inner periphery and the periphery of the supporting bar. When vibration is inputted, the plate 5 moves vertically to circulate the silicon oil in the gap for causing resistance damping. Since the bar 4 is not damaged by interfering with the soft rubber later, the dimension of the above gap can be widely changed for regulating the clamping force.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a liquid-filled vibration isolator,
In particular, the present invention relates to a structural improvement of a liquid-filled vibration isolator that seals in a viscous liquid and uses liquid friction to dampen vibrations.

0002

2. Description of the Related Art An example of such a liquid-filled vibration isolator is shown in FIG. In the figure, the lower end of a cylindrical side plate 7 is caulked and fixed to a bottom plate 3, and the bottom plate 3 is fixed to a base such as a vehicle body frame with bolts 31. A thick container-shaped vibration isolating rubber body 1 with an upper plate 2 embedded in the top is joined to the enlarged diameter upper half opening of the side plate 7, and a highly viscous silicone oil or the like is sealed in the closed space. A liquid chamber A is formed with the vibration isolating rubber body 1 as a chamber wall.

A support rod 4 is screwed into the center screw hole of the upper plate 2, and the upper end of the support rod 4 passes through the upper plate 2 to form a bolt portion 41. The engine, which is the vibrating body, is on the upper plate 2.
and is fixed to the bolt part 41. Support rod 4
The lower end extends into the liquid chamber A, and the stirring plate 5 is fixed therein in a horizontal state. The outer periphery of the stirring plate 5 approaches the inner periphery of the side plate 7 at a distance d, and is bent downward to form a flange portion 51 having a length h, forming a liquid flow gap P.

When vibration is input, the vibration isolating rubber body 1 deforms, the top plate 2 and the bottom plate 3 are displaced relative to each other, and the stirring plate 5 moves up and down within the liquid chamber A. Along with this vertical movement, the silicone oil in the liquid chamber A flows through the liquid circulation gap P, and the liquid friction at this time generates a vibration damping force. An example of such a vibration isolator is disclosed in Japanese Unexamined Patent Publication No. 6
It is described in Japanese Patent No. 0-139938.

[0005]

[Problem to be Solved by the Invention] Incidentally, the damping force exerted by the vibration isolator changes depending on the dimensions d and h of the gap P, but vibrations are not always input to the device only from the vertical direction; It is said that the desired damping force cannot be obtained because it is necessary to determine the above dimensions d and h so that the stirring plate 5 does not interfere with the side plate 7 or the vibration isolating rubber body 1 and cause damage when vibration is input from the direction. There was a problem.

[0006] The present invention has been made to solve this problem, and it is an object of the present invention to provide a liquid-filled vibration isolator that can set an arbitrary damping force without causing problems such as interference.

[0007]

[Means for Solving the Problems] To explain the structure of the present invention, a liquid-filled vibration isolator has a chamber wall 1 which is connected at one end to a vibrating body 2 and at the other end to a base body 3 and deforms in response to vibration input. A liquid chamber A containing a viscous liquid is formed, the base end of the support rod 4 is fixed to the vibrating body 2 or the base 3, and a stirring plate 5 is provided at the tip of the support rod 4 located in the liquid chamber A. Further, the base body 3 or the vibrating body 2 to which the base end of the support rod 4 is not fixed is provided with a partition plate 6 having a center opening through which the support rod 4 is inserted and dividing the inside of the liquid chamber A into two. The periphery of the opening is formed into a cylindrical portion 61 that extends along the outer periphery of the support rod 4 and forms a liquid flow gap P of a constant length, and a soft elastic material layer 62 of a predetermined thickness is formed on the inner periphery of the cylindrical portion 61. There is a predetermined distance d and a predetermined length h between the inner circumference of this and the outer circumference of the support rod 4.
A gap is formed between the two.

[0008]

[Operation] In the vibration isolating device having the above structure, when vibration is input, the chamber wall 1 is deformed and the vibrating body 2 and the base body 3 are displaced relative to each other. Thus, the stirring plate 5 reciprocates within the liquid chamber A, and as a result of this reciprocating movement, the viscous liquid is caused to flow through the liquid flow gap P, causing liquid friction and generating a vibration damping force.

Since the liquid flow gap P is formed between the outer periphery of the support rod 4 and the soft elastic material layer 62, interference between the two is not a problem, and the dimensions d and h can be selected within a wide range to achieve a suitable Attenuation characteristics can be obtained.

0010

[Embodiment] An embodiment of the present invention will be described below, focusing on the differences from the conventional one. A liquid chamber A filled with silicone oil is formed in a thick-walled container-shaped vibration-proof rubber body 1, and a support rod 4 screwed onto the upper plate 2 extends into the liquid chamber A, and the tip thereof is used for stirring in a horizontal position. A plate 5 is fixed. The liquid chamber A is provided with a partition plate 6.
The partition plate 6 is divided into upper and lower halves, and the entire partition plate 6 is bent in a stepped manner, and its outer peripheral edge is integrally sandwiched between the cylindrical side plate 7 and the caulking fixing portion of the bottom plate 3.

The center of the partition plate 6 is an opening through which the support rod 4 is inserted, and the edge of the opening is a cylindrical portion 61 extending upward in parallel around the support rod 4. A soft rubber material layer 62 with a constant thickness is bonded to the inner periphery of the cylindrical portion 61, and a liquid flow gap with a distance d and a length h is formed between the inner periphery of the rubber material layer 62 and the outer periphery of the support rod 4. P is formed.

When vibration is input to the vibration isolator having such a structure, the vibration isolating rubber body 1 is deformed, and the support rod 4 and the stirring plate 5 fixed thereto are moved up and down. As the stirring plate 5 moves up and down, the silicone oil is efficiently circulated within the liquid distribution gap P.
Vibration damping force is generated due to frictional resistance during flow.

In this case, even if the support rod 4 swings due to input vibrations other than in the vertical direction, since it is surrounded by the soft rubber material layer 62, there is no risk of damage due to interference. Therefore, the dimensions d and h of the liquid flow gap P can be arbitrarily selected within a wide range, and a desired damping force can be obtained, increasing the degree of freedom in design.

Note that the support rod 4 is provided on the bottom plate 3, and the partition plate 6
may be provided on the upper plate 2.

[0015]

As described above, according to the liquid-filled vibration isolator of the present invention, input vibration can be effectively attenuated and reduced without causing interference between structural members.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view of a liquid-filled vibration isolator according to the present invention.

FIG. 2 is an overall sectional view of a conventional device.

[Explanation of symbols]

1 Rubber elastic body (chamber wall) 2 Upper plate (vibrating body) 3 Bottom plate (base body) 4 Support rod 5 Stirring plate 6 Partition plate 61 Cylinder part 62 Soft rubber material layer (soft elastic material layer) A Liquid chamber

Claims (1)

[Claims] Claim 1: One end of the support rod is connected to the vibrating body and the other end is connected to the base, and a chamber wall that deforms with vibration input forms a liquid chamber containing a viscous liquid, and the base end of the support rod is connected to the vibrating body or the base. A stirring plate is provided at the tip of a support rod fixed to the liquid chamber and located in the liquid chamber, and the base or vibrating body to which the base end of the support rod is not fixed has a central opening through which the support rod is inserted. A partition plate is provided to divide the interior of the liquid chamber into two, and the periphery of the central opening is formed into a cylindrical portion extending along the outer periphery of the support rod, and a soft elastic material layer of a predetermined thickness is formed on the inner periphery of the cylindrical portion. A liquid-filled vibration isolator characterized in that a gap of a predetermined distance and a predetermined length is formed between the inner periphery of the support rod and the outer periphery of the support rod.