JPH0238729A - Vibration isolator - Google Patents

Abstract

PURPOSE:To damp vibration from different directions by forming a limiting flow passage communicating respective small fluid chambers with each other in a space between the specified range of the outer circumferential surface of a partition wall and the inner circumferential surface of an outer cylinder in a vibration isolator used fro an on-vehicle carburator mount and the like. CONSTITUTION:A limiting flow passage 34 is formed in a space between the circumferential surface of a partition wall 30 and the inner circumferential surface of an outer cylinder 16 wherein the outer circumferential surface in the fore-and-aft direction of the partition wall 30 does not come in contact with the inner circumferential surface of an outer cylinder 14. This permits an upper fluid chamber 26A to be communicated with a lower fluid chamber 26B. The partition wall 30 vibrates vertically against the vertical vibration of an inner cylinder 12. This constitution thereby enables one vibration isolator to damp vibration from different directions such as an up-and-down one, a fore-and-aft one and one to the right or left.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolating device that is attached to a vehicle or the like and absorbs vibrations.

[Prior Art] As a vibration isolator that can be used for automobile member mounts, differential mounts, cab mounts, etc., a vibration isolator in which an inner and outer cylinder are arranged coaxially and a liquid is sealed between them has been proposed. (Utility Model No. 61-7741, Utility Model No. 61-
No. 141839).

These vibration isolators have a structure in which the liquid chamber between the inner and outer cylinders is divided into small liquid chambers and communicated through a restricted flow path. This provides a large vibration damping force.

However, these vibration isolators were only able to damp vibrations from one of the vertical, longitudinal, and lateral directions of the vibration isolator.

Therefore, when the vibration isolator is used in an automobile suspension or the like in which vibrations enter the vibration isolator from different directions such as vertical, longitudinal, and lateral directions, the conventional vibration isolator cannot cope with the vibrations.

[Problems to be Solved by the Invention] In view of the above facts, the present invention provides vibration control in the vertical and vertical directions with one vibration isolator.
It is an object of the present invention to provide a vibration isolator that can attenuate vibrations from different directions, such as the front-rear direction and the left-right direction.

[Means for Solving the Problems] The present invention provides an inner cylinder, an outer cylinder disposed coaxially with the inner cylinder,
a first elastic member that connects the inner cylinder and the outer cylinder; a second elastic member that connects the inner cylinder and the outer cylinder at a position separated from the first elastic member in the axial direction of the inner cylinder; A partition wall is provided between the elastic member and the second elastic member and partitions the liquid chamber formed by the first elastic member and the second elastic member into a small liquid chamber in the axial direction of the inner cylinder. A vibration isolating device that forms a restricted flow path that communicates the small liquid chambers between a predetermined range of the outer circumferential surface of the partition wall and the inner circumferential surface of the outer cylinder, and The other predetermined range was configured to be in contact with the inner circumferential surface of the outer cylinder and to be able to slide in the vertical direction.

[Function] In the present invention having the above configuration, the partition wall formed in the vibration isolator that partitions the liquid chamber is made vertically slidable in accordance with the vibration in the vertical direction, so that the small liquid chamber formed by the partition wall is By expanding and contracting, vibrations in the vertical direction are attenuated, and vibrations in the horizontal direction (front, rear, left and right directions) are attenuated by the liquid flowing horizontally in the restricted flow path and in each of the upper and lower small liquid chambers. can.

[First Embodiment] FIGS. 1 and 2 show a vibration isolation/vibration device 10 according to a first embodiment of the present invention. The vibration isolator 10 is used with an inner cylinder 12, an intermediate cylinder 14, and an outer cylinder 16 disposed coaxially, with their axes oriented in the vertical direction (direction of arrow A in FIG. 1). The intermediate cylinder 14 is an upper intermediate cylinder 14 as shown in FIG.
It is divided into two in the vertical direction, such as A and a lower intermediate cylinder 14B.

A first elastic member I8 made of rubber or the like is provided between the inner cylinder 12 and the lower intermediate cylinder 14B, and is vulcanized and bonded to the inner cylinder 12 and the lower intermediate cylinder 14B, respectively.

On the other hand, a second elastic member 20 made of rubber or the like is provided between the outer periphery of the upper end of the inner cylinder 12 and the inner periphery of the upper intermediate cylinder 14A, and is vulcanized and bonded to the inner cylinder 12 and the upper intermediate cylinder 14A, respectively. There is.

In the embodiment, the second elastic member 20 is made of an elastic body such as rubber, like the first elastic member 18. First elastic member 1
It is preferable that the elastic member 8 and the second elastic member 20 have approximately the same thickness, or one of them may be slightly thinner than the other.

An outer cylinder 16 is fitted to the outer periphery of the intermediate cylinder 14, and the intermediate cylinder 14
and the outer cylinder 16 are caulked and fixed.

Further, a groove 22 is formed on the outer circumferential surface of the upper intermediate cylinder 14A and the lower intermediate cylinder 14B, and an O-ring 24 is fitted into the groove 22.

Further, a hole 25 is formed in the vertically intermediate portion of the outer cylinder 16, so that a liquid such as silicone oil can be injected into a liquid chamber 26 provided in the vibration isolator IO. and,
A rivet 28 is fitted into the hole 25 to serve as a plug for the hole 25. The outer circumferential surface of the outer cylinder I6 at the portion where the rivet 28 is fitted has a flat plate shape as shown in FIG. Therefore, the head of the rivet 280 does not protrude beyond the circumference of the outer tube 16, and no problems occur even when the outer tube 16 is used by fitting it into another collar or the like.

A liquid chamber 26 is formed between the second elastic member 20 and the first elastic member 18, and has a high viscosity (10,000 to 100,000
A liquid such as silicone oil (0cst) is sealed from the hole 25.

The liquid chamber 26 is formed between the first elastic member 18 and the second elastic member 20 by a partition wall 30 integrally formed of the same rubber material as the first elastic member 18 and the second elastic member 20. room 2
It is divided into a lower liquid chamber 6A and a lower liquid chamber 26B. This partition wall 3
A disk-shaped core material 32 made of resin or metal is buried and fixed in the hole 0 by vulcanization adhesive. The upper liquid chamber 26A and the lower liquid chamber 26B are each formed continuously over the entire circumferential area.

As shown in FIG. 2, a circular hole 32A is formed in the core material 32,
The inner tube 12 is fitted and inserted into the circular hole 32A, and the core material 32 and the inner tube 12 are fixed. Further, a groove 32B is formed on the outer peripheral surface of the core material 32 in the front-rear direction (in the direction of arrow B in FIG. 2) to prevent the tip of the rivet 28 from coming into contact with it. Therefore, by preventing damage to the rivet 28, liquid leakage from the liquid chamber 26 can be prevented. The outer peripheral surface of the core member 32 in the left-right direction (direction of arrow C in FIG. 2) is in contact with the inner peripheral surface of the outer cylinder 16.

Further, the outer circumferential surface of the partition wall 30 in the front-rear direction does not come into contact with the inner circumferential surface of the outer tube 14, and a restricted flow path 34 is formed between the outer circumferential surface of the partition wall 30 and the inner circumferential surface of the outer tube 16. This allows the upper liquid chamber 26A and the upper liquid chamber 26B to communicate with each other. As shown in FIG. 2, the restricted flow passages 34 are formed on opposite sides of the axis of the inner cylinder 12, respectively. Therefore, when horizontal vibration in the longitudinal direction (direction of arrow B) that connects the restricted flow path 34 and the axis of the inner cylinder 12 is applied to the outer cylinder 1G, the partition wall 30 is easily deformed, and the partition wall 30 differs by 90 degrees from this. Restricted flow path 3
When horizontal vibration (in the direction of arrow C) is applied from the left and right direction where the outer cylinder 16 and the partition wall 30 in which the partition wall 4 is not provided are in contact with each other, the outer cylinder 16 has a relatively high rigidity ratio.

Next, the operation of this embodiment will be explained.

The outer cylinder 16 of the vibration isolator 10 is attached to the chassis of the automobile, and the inner cylinder 12 is attached to the chassis of the automobile.
The effect when attached to the body of a car will be explained.

In response to the vertical vibration of the vibration isolator 10, the partition wall 30 vibrates vertically as the inner cylinder 12 vibrates in the vertical direction. For this reason, the upper liquid chamber 26A and the upper liquid chamber 26B divided by the partition wall 30 expand and contract, so silicone oil flows into the restricted flow path 34, and damping is obtained by the viscous resistance at that time. Moreover, since the silicone oil used in this embodiment is a highly viscous fluid, damping can be obtained over a wide range of frequencies.

In addition, for vibrations in the horizontal direction (back-and-forth direction) of the vibration isolator 10, between the outer cylinder 15 and the outer peripheral surface of the partition wall 30 and between the outer cylinder 16 and the inner cylinder 12, that is, the restricted flow path 34, the upper liquid chamber 26A, and the upper liquid chamber 26B in the horizontal direction, and the viscous resistance at this time provides attenuation in a wide range of frequencies. In addition, the damping in the vertical direction, longitudinal direction, and horizontal direction in this example is shown in Fig. 5 (A), (
It is represented by the graphs of B) and (C).

When the vibration isolator 10 of this embodiment is attached to an automobile suspension component, the rigidity in the front-rear direction and the left-right direction are different in order to ensure stability of maneuverability. Therefore, in the direction of high rigidity, the vibration isolator 10 makes a part of the outer circumferential surface of the partition wall 30 come into contact with the outer cylinder 16 to increase the rigidity. Moreover, since the partition wall 30 is slidable in the vertical direction, the rigidity in the vertical direction is increased, and the upper liquid chamber 26A and the upper liquid chamber 26B can be expanded and contracted smoothly, so that high damping can be obtained.

[Second Embodiment] FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, the intermediate cylinder 14, which was divided into upper and lower parts in the first embodiment, is integrated.

Note that the intermediate cylinder 14 and the partition wall 3 in the left-right direction (direction of arrow C)
0 and are separated during vulcanization, and are brought into contact by squeezing the vulcanizer intermediate cylinder 14.

[Effects of the Invention] As explained above, the vibration isolating device according to the present invention has the effect that vibrations from different directions such as the vertical direction, the longitudinal direction, and the horizontal direction can be attenuated with one vibration isolating device.

In addition, since a part of the partition wall is brought into contact with the outer cylinder, an appropriate stiffness ratio in the front, rear, left, and right directions of the vibration isolator can be obtained, and since the partition wall slides in the vertical direction, the stiffness in the vertical direction does not increase. Moreover, since the liquid chamber expands and contracts in the vertical direction smoothly, it has the effect that high damping can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a vibration isolator according to a first embodiment of the present invention, and FIG.
The figure is a horizontal sectional view corresponding to the section taken along the line II--II in FIG. 1, FIG. 3 is a sectional view corresponding to the section taken along the 5A, 5B, and 5C are graphs showing the attenuation of the vibration isolator in the vertical, longitudinal, and lateral directions. 10 ・ ・ 12 ・ ・ 14 ・ ・ 16 ・ ・ 18 ・ 20 ・ ・ 26 ・ 30 ・ ・ 34 ・ ・ ・Vibration isolator, ・Inner tube, ・Intermediate tube, ・Outer tube, ・First elastic member , ・Second elastic member, ・Liquid chamber, ・Partition wall, ・Restricted flow path.

Claims (1)

[Claims] (1) An inner cylinder, an outer cylinder disposed coaxially with the inner cylinder, a first elastic member connecting the inner cylinder and the outer cylinder, and an axial direction of the inner cylinder with respect to the first elastic member. A second elastic member that connects the inner cylinder and the outer cylinder at a separated position, and a first elastic member and a second elastic member that are provided between the first elastic member and the second elastic member. A vibration isolator comprising a partition wall that partitions a small liquid chamber into a small liquid chamber in the axial direction of an inner cylinder, the vibration isolator comprising a partition wall that divides a small liquid chamber into a small liquid chamber, the vibration isolator comprising: A restricted flow path is formed to communicate the small liquid chambers with each other, and another predetermined area of the outer circumferential surface of the partition wall is in contact with the inner circumferential surface of the outer cylinder and is slidable in the vertical direction. Anti-vibration device.