JPS6256642A - Vibropreventive device - Google Patents

Abstract

PURPOSE:To eliminate damage of a moving plate by installing a movable member on a prop protruding in a liquid chamber with capability of relative movement perpendicular to the vibrating direction as well as possibility of relative micro-movement in the vibrating direction. CONSTITUTION:A spacer 46 is installed on a prop 24 protruding in a liquid chamber 38, and moving plates 52, 54 are inserted in the periphery. Another moving plate 56 is capable of relative motion horizontally with respect to said plates 52, 54, which has possibility of relative micro-movement in the axial direction of the above-mentioned prop 24. This will prevent damage to movable members even during vibration in different directions.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolator that absorbs vibrations due to the flow of liquid when a movable plate moves within a liquid chamber.

[Background art and issues to be solved] A support is protruded into the liquid chamber for vibration isolation of an automobile engine mount, etc., a flexible member is attached to the tip of the support, and the ET moving member is connected to the inner wall of the liquid chamber. A vibration isolator has been proposed in which an orifice is formed between the two.

In this vibration isolator, the liquid chamber is divided into a plurality of small liquid chambers by a movable plate, so when the column vibrates, the 6F moving plate expands and contracts the small liquid chamber, and the liquid flows through the orifice. The structure is such that vibrations are absorbed by the resistance of the case. In addition, it has been proposed that this vibration isolator is provided with a gap between the movable plate and the column that allows minute vibrations so as to absorb high frequency vibrations.

However, in this vibration isolator, when vibrations act in different directions, the movable plate collides with the inner wall of the liquid chamber, causing noise or damage to the movable plate.

In consideration of the above-mentioned facts, the present invention aims to provide a vibration isolator that can absorb high frequency vibrations and does not damage the movable plate even when vibrating in different directions.

[Summary and operation of the invention] In the uninvented vibration isolating device, a movable member is attached to the support 1 protruding into the liquid chamber to divide the liquid chamber into a plurality of small liquid chambers,
A vibration isolating device that absorbs vibrations by flowing liquid between a movable member and a liquid chamber when a column vibrates, wherein the movable member is arranged to be movable relative to the column in a direction perpendicular to the direction of vibration force. It is characterized in that it is mounted so as to be able to move slightly relative to the direction of vibration.

Therefore, in the present invention, during normal low-frequency vibrations, the movable member expands and contracts the small liquid chamber, so that vibrations are absorbed by the resistance of the liquid passing between the movable member and the liquid chamber wall, and during high-frequency vibrations, the movable member expands and contracts the small liquid chamber. This is absorbed by slight relative movement between the pillar and the support. Furthermore, in response to vibrations in a direction different from the normal vibration direction, the movable member moves relative to the support column, thereby preventing damage to the movable member.

[Embodiment of the invention] Fig. 1.2 shows a vibration isolator 10 according to a first embodiment of the invention.
It is shown.

This vibration isolator JO has a mounting plate 12 fixed to the body of an automobile (not shown). An outer cylinder 14 is fixed to the center of the mounting plate 12, and a base plate 16 is fixed to the lower end of the outer cylinder 14 by caulking.

The outer circumference of an elastic body 20 such as rubber is vulcanized and adhered to the inner circumference of the L portion of the outer cylinder 14 . The inner circumference of this elastic body 20 is the sleeve 2
It is vulcanized and adhered to the outer periphery of 2.

A strut 24 passes through this sleeve 22.

A step portion 26 formed in the axially intermediate portion of the support column 24 contacts the lower end portion of the sleeve 22, and a mounting plate 30 is fixed to the E end portion protruding from the sleeve 22 with a nut 28. An automobile engine (not shown) can be mounted and fixed on this mounting plate 30.

The lower end of the outer cylinder 14 is provided with an inner cylinder 3 along with a base plate 16.
The lower end of 2 is fixed. The outer periphery of an elastic membrane 34 made of rubber or the like is vulcanized and bonded to the upper end of the inner cylinder 32 . The inner periphery of the adhesive film 34 is vulcanized and bonded to the outer periphery of the column 24. As a result, the outer cylinder 14, the inner cylinder 32, and the elastic body 2
0 and the elastic membrane 34 form an air chamber 36, and the base plate 16, the inner cylinder 32, and the elastic membrane 34 form a liquid chamber 38. This liquid chamber 38 is filled with a liquid such as silicone oil.

A small-diameter shaft 42 integrally projects from the lower end of the column 24 that projects into the liquid chamber 38 via a step 40 . A stopper 44, a spacer 46 and a stopper 48 are attached to this small diameter shaft 42.
is inserted, and the lower end portion of the small diameter shaft 42 is formed into an enlarged diameter portion 50 by caulking.

Movable plates 52 and 54 made of synthetic resin are attached to the outer periphery of the spacer 46.
is inserted. The movable plates 52 and 54 are arranged at regular intervals, and the sleeve core portion of the movable plate 52 is bent at a right angle to form a bent portion 52A, and the distal end thereof is abutted and fixed to the movable plate 54. As a result, the movable plate 52.
54 are fixed at regular intervals, and an annular movable plate 56 made of synthetic resin is inserted into this interval. The outer shape of the movable plate 56 is larger than that of the movable plates 52 and 54, and the circular hole 58 has a large gap between it and the bent portion 52A. Therefore, the movable plate 56 is similar to the movable plates 5z, 54.
It is possible to move relative to the water surface.

Furthermore, the movable plate 52.54 has a gap between it and the stopper 44.4.8, so that it can be moved slightly downwardly, that is, in the axial direction of the support column 24. Further, as clearly shown in FIG. 2, the stoppers 44, 48 have protrusions 60 protruding from appropriate positions (in this embodiment, three locations) on the outer periphery, and these protrusions 60 mainly allow the movable plates 52, 52 to
is now restricted from movement. Therefore, the liquid in the liquid chamber 38 can easily enter between the movable plate 52.54 and the spacer 46, so that the vertical vibration of the movable plate 52.54 is not hindered.

The liquid chamber 38 is divided by the movable plate 56 into an upper liquid chamber 38A and a lower liquid chamber 38B, which are communicated through an orifice formed between the outer circumference of the movable plate 56 and the inner circumference of the inner cylinder 32. There is.

Next, the operation of this embodiment will be explained.

When the mounting plate 12 is fixed to the vehicle body and the automobile engine is mounted on the mounting plate 30, the assembly is completed.

During low frequency vibrations of the engine, minute vibrations applied to the mounting plate 30 act on the elastic body 20, so that the internal friction of the elastic body 20 absorbs this vibration. Also, within the liquid chamber 38, the column 2
4 moves up and down, the movable plate 56 expands and contracts the upper liquid chamber 38A and the lower liquid chamber 38B. As a result, the liquid passes through the outer periphery of the movable plate 56, which is the orifice portion, and resistance is generated in the orifice portion, which also causes pregnancy.
The ribs are absorbed.

If the vibration is at a high frequency, the orifice portion becomes clogged, but since the movable plate 52, 54 and the movable plate 56 can vibrate slightly between the stoppers 44, 48, the high frequency vibration is absorbed. Ru.

Furthermore, if the vibration has a component not only in the axial direction of the support column 24 but also in a different direction, the support column 24 will also move in the left-right direction in FIG. Therefore, the outer circumference of the movable plate 56 collides with the inner circumference of the mounting plate 30, but the movable plate 56
Since the circular hole 58 has a large gap with the bent portion 52A, the movable plate 5G moves horizontally relative to the support 24, and no noise is generated due to collision, and the movable plate 56 There will be no damage.

Next, FIG. 3 shows a second embodiment of the invention. In this embodiment, the movable plates 52 and 54 and the movable plate 56 of the previous embodiment are attached in reverse.

That is, the movable plate 56 is attached to the outer periphery of the spacer 46, and can vibrate slightly in the vertical direction until it comes into contact with the stopper 44.48. The movable plates 52 and 54 are attached to the outer periphery of the movable plate 56, and the bent portion 52A is connected to the movable plate 52.
It is formed at the outer peripheral end of. Therefore, a gap is created between the bent portion 52A and the outer periphery of the movable plate 56.
6, it becomes possible to move relative to the left and right direction in FIG.

Therefore, this embodiment can also achieve the same effects as the previous embodiment.

Next, FIG. 4 shows a third embodiment of the present invention.

In this embodiment, the movable plates 52, 54 are fixed to small columns 62 which constitute the support member. This small strut 62 is made of synthetic resin, and its upper end is inserted into a notch 64 formed in the lower end of the strut 24 that penetrates in the radial direction, and is inserted into the strut 24.
A pin 66 is inserted through the lower end of 4. The through hole 68 of the small support 62 through which this pin 66 is passed is
The small support 62 is formed to be larger than the external shape of the support 6 and has a gap, so that the small support 62 can move slightly relative to the top and bottom in the vertical direction in FIG.

Further, in this embodiment, an elastic body 70 is attached to the outer periphery of the movable plate 56, so as to provide a buffering effect when the movable plate 56 collides with the inner periphery of the inner cylinder 32.

Therefore, in this embodiment, the movable plate 56 moves horizontally relative to the column 24 as in the first embodiment, and the movable plate 56, together with the small column 62, can move slightly relative to the column 24 in the vertical direction. It has become. Therefore, the same effects as in the first embodiment can be obtained, but manufacturing and assembly are simpler than in the first embodiment.

[Effects of the Invention] As explained above, in the anti-vibration bag according to the present invention, a movable member is attached to a column protruding into the liquid chamber to divide the liquid chamber into a plurality of small liquid chambers, and when the column vibrates, the IJT A vibration isolating device that absorbs vibrations by allowing liquid to flow between a moving member and a liquid chamber, wherein the iq sensor member is attached to the pillar so as to be relatively movable in a direction perpendicular to the vibration direction; Since it is characterized by being mounted so that it can be moved slightly relative to the direction of vibration, it can absorb vibration over a wide range and has an excellent effect of preventing damage to the movable member even when vibrations occur in different directions.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of a vibration isolator according to the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a cross-sectional view showing main parts of the second embodiment. 4 are sectional views corresponding to FIG. 1 showing a third embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Vibration isolator, 24... Strut, 38... Liquid chamber, 38A Participant and small liquid chamber, 38B-- Bottom liquid chamber, 52... Movable plate, 52A-- Bent part , 54...Bending portion, 56--Bending portion, 62... Small strut. Fig. 2 Fig. 3 Fig. 4 62...l''・Sentence pillar

Claims (3)

[Claims] (1) A movable member is attached to a column that protrudes into the liquid chamber, dividing the liquid chamber into multiple small liquid chambers, and when the column vibrates, the liquid flows between the movable member and the liquid chamber to absorb vibrations. A vibration isolator, characterized in that the movable member is attached to the column so as to be relatively movable in a direction perpendicular to the vibration direction, and is also attached to be movable slightly relative to the vibration direction. (2) The movable member is attached to a support member so as to be relatively movable in a direction perpendicular to the vibration direction, and the support member is attached to a column so as to be able to move slightly relative to the vibration direction. A vibration isolator according to scope item (1). (3) The support member is attached to the column by a pin attached to the column passing through it, and a gap between the through hole and the pin allows slight relative movement in the vibration direction. Claim No. (2)
Anti-vibration device as described in section.