JPH11141595A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibrations for a wide range of frequency and wide vibrating directions. SOLUTION: Damper members 32 are installed in a right liquid chamber 26A and left liquid chamber 26B in their positions on the inside circumferential surface of each outer cylinder metal piece 12. A mass metal piece 38 in block shape capable of abutting to a stopper metal piece 20 is installed on the internal circumferential surface of each damper member 32 in its position mating with the stopper metal piece 20. The mass metal piece 38 is adhered in vulcanization to the damper body 34 made of rubber, which is located being pinched by a supporting metal piece 36 and the mass metal piece 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for absorbing vibration from a vibration generator, and is suitable for a fluid bush or a fluid member mount applicable to, for example, vehicles, general industrial machines, and the like. .

[0002]

2. Description of the Related Art For example, a vibration isolator, which is a bush-type fluid bush in which a fluid is sealed, is disposed between a wheel serving as a vibration generating unit and a vehicle body serving as a vibration receiving unit. The vibration generated by the vibration absorber is absorbed by the vibration isolator and is prevented from being transmitted to the vehicle body.

That is, this vibration isolator includes a rubber elastic body disposed between an inner cylinder and an outer cylinder, a pair of liquid chambers in which liquid is sealed, and a restriction connecting the pair of liquid chambers. One having a passage is known. When the vehicle runs and generates vibration, the vibration is absorbed and attenuated by the vibration damping function of the elastic body, the viscous resistance of the liquid in the pair of liquid chambers, and the liquid column resonance, and the vibration is reduced. It is designed to block transmission.

In this vibration isolator, vibration is input from a direction orthogonal to the axial direction of the inner cylinder and the outer cylinder, but a stopper member is protruded in this direction, and the stopper member projects the inner cylinder and the outer cylinder. Had limited excessive relative displacement between them.

[0005]

As a feature of the above-described conventional vibration isolator, the restriction passage is clogged in a region where the frequency is higher than a region where the liquid column resonates. Then, in a high-frequency region where the restriction passage is clogged, FIG.
The dynamic spring constant K increases as shown in FIG.

Therefore, if the resonance frequency (shown by a dotted line in FIG. 9) of the link of the suspension exists as shown in FIG. 9B corresponding to the frequency region where clogging occurs, these are added together as shown in FIG. The characteristic shown in FIG. 3C is obtained, and the vibration isolation characteristic is reduced in the resonance frequency range of the link, and the vibration is easily transmitted to the vehicle body.

Further, the direction of the vibration in which the dynamic spring constant is reduced by the liquid column resonance between the pair of liquid chambers is usually only the direction in which the pair of liquid chambers are arranged, and the vibration in the other direction is the liquid column. The effect of lowering the dynamic spring due to resonance cannot be expected.

The present invention has been made in view of the above circumstances, and has as its object to provide a vibration isolator capable of reducing vibration in a wide frequency range and a wide range of vibration directions.

[0009]

According to a first aspect of the present invention, there is provided an anti-vibration device comprising: a cylindrical outer cylinder connected to one of a vibration generating section and a vibration receiving section; An inner cylinder connected and arranged inside the outer cylinder, an elastic body formed between the outer cylinder and the inner cylinder and formed to be elastically deformable and having a recess, and provided in the recess of the elastic body. A liquid chamber in which the liquid is sealed, a mass member disposed in the liquid chamber and having a predetermined weight, and a base member connected to the inner wall surface of the liquid chamber and a mass member connected to the distal end to elastically deform the mass member. And an elastic supporting member for supporting the deformable member.

According to a second aspect of the present invention, in the vibration isolator of the first aspect, the base end of the elastic support member is connected to the inner peripheral side of the outer cylinder.

The operation of the vibration isolator according to claim 1 will be described below. The inner cylinder is arranged inside the cylindrical outer cylinder, the outer cylinder or the inner cylinder is connected to the vibration generating unit, and the inner cylinder or the outer cylinder is connected to the vibration receiving unit. Further, an elastic body is formed between the outer cylinder and the inner cylinder so as to be elastically deformable. further,
A liquid chamber in which liquid is sealed is provided in a concave portion of the elastic body, and a base end side of the elastic support member is connected to an inner wall surface of the liquid chamber. Further, a mass member having a predetermined weight is connected to the distal end side of the elastic support member, and the mass member is supported by the elastic support member so as to be elastically deformable, so that the mass member is disposed in the liquid chamber.

Therefore, when vibration is input to the inner cylinder or the outer cylinder from the vibration generating section, the vibration is attenuated by the deformation of the elastic body as a result of the deformation of the elastic body, and further, the liquid chamber is accompanied by the deformation of the elastic body. The liquid flows, and the vibration is suppressed by viscous resistance of the liquid and liquid column resonance. For this reason, not only the deformation of the elastic body, but also the vibration is attenuated due to the viscous resistance of the liquid, the liquid column resonance, and the like, and it becomes difficult for the vibration to be transmitted to the vibration receiving portion connected to the outer cylinder or the inner cylinder.

Further, since a mass member having a predetermined weight is connected to the distal end side of the elastic support member and the mass member is disposed in the liquid chamber, the mass member and the elastic support member function similarly to the dynamic damper. Can be played.

That is, by adjusting the weight of the mass member and the elasticity of the elastic support member so as to reduce the vibration in the range of the frequency of the target vibration, the displacement of the mass member supported by the elastic support member is adjusted. Accordingly, it becomes more difficult for the vibration to be transmitted to the vibration receiving portion. Since the vibration direction that can be reduced at this time may be any direction in which the elastic support member can be deformed, the vibration can be reduced in a wide range of vibration directions.

As described above, not only the elastic body and the liquid but also the mass member and the elastic supporting member can reduce the vibration corresponding to a wide frequency range and a wide vibration direction.

On the other hand, when an excessive amplitude of vibration is input to the vibration isolator, the mass member abuts against the inner wall surface of the liquid chamber, thereby causing the inner cylinder and the outer cylinder to move in the same manner as the conventional vibration isolator. And an excessive relative displacement between them can be suppressed.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same configuration as that of the first aspect and operates similarly. However, the present invention has a configuration in which the base end side of the elastic support member is connected to the inner peripheral side of the outer cylinder.

Therefore, according to the structure of the present invention, the elastic support member and the mass member extending from the inner peripheral side of the outer cylinder have the same effect as the dynamic damper, and the mass member is provided on the wall surface on the inner cylinder side. And the relative displacement between the inner cylinder and the outer cylinder can be limited.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 6 show a vibration isolator according to a first embodiment of the present invention, and the present embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 2, an anti-vibration device 10 according to the present embodiment has an outer cylindrical metal fitting 12 formed into a cylindrical shape.
Is provided as an outer frame, and the outer cylinder fitting 12 is fitted to the vehicle body (not shown) of the automobile as a vibration receiving portion, and the outer cylinder fitting 12 is connected to the vehicle body.

Inside the outer cylinder 12, an inner cylinder 14 formed in a tubular shape is disposed so as to be parallel to the axis of the outer cylinder 12. Then, a bolt (not shown) is screwed into the inner cylinder fitting 14, and the inner cylinder fitting 14 and a wheel (not shown) serving as a vibration generating unit are connected.

Further, a stopper metal fitting 20 is fitted to the inner cylindrical metal fitting 14 at the axial center of the inner cylindrical metal fitting 14 so as to protrude in the X direction, which is the left-right direction in FIG. It is arranged so as to be equal.

On the other hand, the inner cylindrical fitting 14 and the outer cylindrical fitting 12
As shown in FIGS. 3 and 4, a pair of flange portions 16 </ b> B protruding along the inner peripheral surface of the outer cylinder fitting 12 while being vulcanized and bonded to the inner cylinder fitting 14 as shown in FIGS. The elastic body 16 made of rubber is provided. As shown in FIGS. 1 and 4, between the pair of flange portions 16B,
A pair of connecting portions 16A extending from the periphery of the inner cylindrical member 14 to the outer peripheral side along a direction intersecting with the direction in which the stopper member 20 projects is formed as a part of the elastic body 16. The elastic body 16 extends around the stopper 20 and covers the stopper 20 as a covering rubber 22.

Therefore, each of the pair of flange portions 16B
In the portion of the elastic body 16 between the connecting portion 16A and the connecting portion 16A, a pair of recessed openings 16C is formed.

As shown in FIGS. 1 and 4, at a position near the outer peripheral side of the elastic body 16, an intermediate cylinder 18 formed into a cylindrical shape is provided with a pair of flange portions 16B of the elastic body 16 and a pair of flanges 16B. It is arranged by being vulcanized and bonded to the outer peripheral surface of the connecting portion 16A.

The middle part of the intermediate cylinder 18 in the axial direction has a one-step narrow diameter, and the narrow part which faces the stopper 20 has a pair of openings 18B.
Are provided and opened. Also, the intermediate cylinder 1
A seal rubber 24 connected to the elastic body 16 is disposed on the outer peripheral surface of the portion having the small diameter of 8.
A groove 24 extending along the circumferential direction is provided at the axial center of
A is formed as a pair.

The intermediate tube 18 is fitted to the outer tube fitting 12, and these are fixed to each other.
The seal rubber 24 seals a fitting portion between the intermediate tube 18 and the outer tube fitting 12 while connecting the pair of openings 18B.

As described above, the opening concave portion 16C of the elastic body 16 is sealed by the outer cylindrical fitting 12, and the pair of spaces in which the inner wall surface is formed by the opening concave portion 16C of the elastic body 16, the outer cylindrical fitting 12, etc. A part liquid chamber 26A and a left part liquid chamber 26B are configured. A liquid such as water or oil is sealed in the right liquid chamber 26A and the left liquid chamber 26B.

On the other hand, inside the right liquid chamber 26A and the left liquid chamber 26B, and on the inner peripheral surface of the outer cylinder fitting 12, a pair of arc-shaped damper members 32 are respectively installed. .

Plate-shaped support members 36 for fixing the damper member 32 to the inner peripheral surface of the outer cylindrical member 12 are arranged on the outer peripheral side of the damper members 32, respectively. Are the outer tube fitting 12 and the intermediate tube 18 respectively.
Is sandwiched between. Further, at the position on the inner peripheral side of the damper member 32 and opposed to the stopper fitting 20, a mass fitting 38 which is a block-shaped mass member that can abut the stopper fitting 20 is arranged. Therefore, the mass fitting 38 has a predetermined weight.

The support member 36 and the mass member 38 are respectively vulcanized and bonded to a damper body 34, which is an elastic support member made of rubber, and the damper body 34 is sandwiched between the support member 36 and the mass member 38. positioned.

That is, the base end sides of the pair of damper bodies 34 are connected to the inner wall surfaces of the pair of liquid chambers 26A and 26B, respectively, and the pair of mass fittings 38 are connected to the tip sides of the pair of damper bodies 34, respectively. These mass fittings 38 are supported so as to be elastically deformable.

Further, by contacting the damper member 32 with the stopper member 20, excessive displacement of the inner cylindrical member 14 in the X direction which is the main vibration direction of the vibration isolator 10 is suppressed.

A pair of orifices 30 serving as restriction passages are formed in a gap between the pair of grooves 24A and the inner peripheral surface of the outer cylinder fitting 12, and the pair of orifices 30 are connected to the right liquid chamber 26A and the left liquid chamber 26A. The connection with the part liquid chamber 26B is established so as to communicate with each other.

Next, the operation of the present embodiment will be described. The inner tube fitting 14 is arranged inside the cylindrical outer tube fitting 12, the inner tube fitting 14 is connected to the wheel, and the outer tube fitting 12 is connected to the vehicle body. Further, the outer cylinder fitting 12 is formed so as to be elastically deformable.
An intermediate cylinder 18 is fixed to the outer peripheral portion of the elastic body 16 disposed between the inner cylinder 14 and the inner cylinder 14, and the intermediate cylinder 18 is fitted to the inner peripheral surface of the outer cylinder 12. Then, a pair of liquid chambers 2 in which liquid is sealed is formed in the opening recess 16C of the elastic body 16.
6A and 26B are provided, and the orifice 30 communicates between the pair of liquid chambers 26A and 26B to allow the liquid to flow.

Further, the base end sides of the pair of damper bodies 34 are connected to the inner peripheral surface of the outer cylinder fitting 12 which is the inner wall surfaces of the pair of liquid chambers 26A and 26B via the support fitting 36, respectively. Further, a pair of mass fittings 38 having a predetermined weight are connected to the distal ends of the pair of damper bodies 34, respectively, and the mass fittings 38 are supported by the damper body 34 so that they can be elastically deformed, respectively. Liquid chamber 26
A mass fitting 38 of the damper member 32 is disposed in each of A and 26B.

Accordingly, when vibration is input to the inner cylinder 14 from the wheel side, the vibration is attenuated by the deformation of the elastic body 16 as a result of the deformation of the elastic body 16 and
The liquid in the pair of liquid chambers 26 </ b> A and 26 </ b> B flows via the orifice 30 with the deformation. As a result, due to the viscous resistance of the liquid, the liquid column resonance, and the like, the vibration is suppressed as a low dynamic spring as shown in FIG. For this reason, not only the deformation of the elastic body 16 but also the vibration is attenuated by the viscous resistance of the liquid, the liquid column resonance, and the like, so that the vibration is less likely to be transmitted to the vehicle body connected to the outer cylinder fitting 12.

Further, a mass fitting 38 having a predetermined weight is connected to the distal end side of the damper main body 34 so as to form a pair of liquid chambers 2.
6A and 26B, a pair of mass metal fittings 38 are disposed, respectively, so that these mass metal fittings 38 and the damper body 34
Accordingly, the same operation as the dynamic damper can be achieved.

That is, if the object is to reduce vibration in the resonance frequency region (shown by a dotted line in FIG. 5) of the link of the suspension device (not shown) disposed between the wheel and the vibration isolator 10, The weight of the mass fitting 38 and the elasticity of the damper body 34 are adjusted accordingly. Accordingly, with the displacement of the mass fitting 38 supported by the damper body 34,
The dynamic spring constant K decreases from the characteristic indicated by the one-dot chain line in FIG. 5B to the characteristic indicated by the solid line, making it more difficult for vibration to be transmitted to the vehicle body. And the vibration direction that can be reduced at this time is
The vibration can be reduced in a wide range of vibration directions as long as the damper body 34 can be deformed.

As described above, not only the elastic body 16 and the liquid but also the damper member 32 constituted by the mass fitting 38 and the damper main body 34 combine FIG. 5 (A) and FIG. 5 (B). The characteristic shown in (1) is obtained, and the vibration can be reduced corresponding to a wide frequency range and a wide vibration direction.

On the other hand, the excessive vibration amplitude is
When the value is input to 0, at least one of the pair of mass fittings 38 is the inner wall surface of the pair of liquid chambers 26A and 26B and the stopper fitting 20 which is the wall surface on the inner cylinder fitting 14 side.
, It is possible to suppress an excessive relative displacement between the inner cylindrical member 14 and the outer cylindrical member 12.

At this time, the damper member 32 is connected to the inner cylinder fitting 1.
After contact with the stopper fitting 20 on the fourth side, the damper member 3
Since the inner tube fitting 14 can be displaced by the deformation of the inner tube member 2, no shock is generated.

On the other hand, as shown in FIG. 6 (A), when the resonance frequency region of the link of the suspension device exists in a frequency region lower than the frequency region where the dynamic spring constant K decreases, the vibration isolation is performed in this region. Since the dynamic spring constant K of the device 10 has not decreased, the weight of the mass fitting 38 and the elasticity of the damper main body 34 are adjusted as shown in FIG. 6B. As a result, the same operation as that of the dynamic damper can be achieved as shown in FIG. still,
The horizontal axis of the graphs shown in FIGS. 5 and 6 is the frequency f.

Next, a vibration isolator according to a second embodiment of the present invention is shown in FIG. 7, and this embodiment will be described with reference to FIG. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 7, the vibration isolator 10 according to the present embodiment has a pair of damper members 32 as in the first embodiment. Differently, a damper portion 35 which is a hole is provided in the damper body 34. That is, the provision of the bulge 35 makes it possible to change the width of the frequency at which vibration can be reduced.

Next, FIG. 8 shows a vibration isolator according to a third embodiment of the present invention, and this embodiment will be described with reference to FIG. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 8, the vibration isolator 10 according to the present embodiment has a pair of damper members 32 similarly to the first embodiment. By making the weights of the pair of mass fittings 38A, 38B different from each other and by making the rubber characteristics of the pair of damper bodies 34A, 34B different from each other, it becomes possible to change the frequency at which vibration can be reduced. It is also possible to reduce the vibration of a plurality of eigenvalues.

Further, since the damper member 32 is separate from the elastic body 16, not only the material of the rubber material forming the damper member 32 but also the volume of the rubber material and the mass fitting 38 are provided.
By appropriately changing the weight of the, the anti-vibration characteristics can be adjusted,
Adjustment of anti-vibration characteristics becomes easy.

In the above embodiment, the direction in which the dynamic damper effect is mainly exerted is the X direction in the figure, but if vibration in other directions is a problem, the direction is not limited to the X direction. By arranging the damper member 32 so that a required frequency can be reduced in that direction, vibrations in directions other than the X direction can be positively reduced.

Further, in the above-described embodiment, the structure is such that the pair of liquid chambers communicate with each other through the orifice. However, for example, there is no orifice and there is one liquid chamber filled with a highly viscous liquid. Needless to say, the present invention can be applied to a vibration device.

Further, in the above-described embodiment, the outer cylinder 12 is connected to the body side of the automobile as the vibration receiving portion, and the inner cylinder 14 is connected to the wheel side as the vibration generating portion. Alternatively, the reverse configuration may be adopted.

On the other hand, in the embodiment, the purpose of the present invention is to provide vibration damping for a vehicle. However, the vibration damping device of the present invention can be used for, for example, engine mounts, body mounts, differential mounts, and other uses other than vehicles. Needless to say,
Further, the shape and dimensions of the elastic body and the like are not limited to those of the embodiment.

[0053]

As described above, the vibration damping device of the present invention has an excellent effect that vibration can be reduced in a wide frequency range and a wide range of vibration directions.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration isolator according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the vibration isolator according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line 3-3 of the vibration isolator shown in FIG.

FIG. 4 is a sectional view taken along line 4-4 of the vibration isolator shown in FIG.

FIG. 5 is a diagram illustrating a graph representing the vibration isolation characteristics of the vibration isolation device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a graph representing another vibration isolation characteristic of the vibration isolation device according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional view of a vibration isolator according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view of a vibration isolator according to a third embodiment of the present invention.

FIG. 9 is a graph showing a vibration-proof characteristic of a conventional vibration-proof device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Outer tube fitting (outer tube) 14 Inner tube fitting (inner tube) 16 Elastic body 26A Right liquid chamber 26B Left liquid chamber 32 Damper member 34 Damper body 38 Mass fitting

Claims (2)

[Claims] A cylindrical outer cylinder connected to one of the vibration generator and the vibration receiver; an inner cylinder connected to the other of the vibration generator and the vibration receiver and arranged inside the outer cylinder; An elastic body that is formed between the outer cylinder and the inner cylinder and that is elastically deformable and has a concave portion; a liquid chamber provided in the concave portion of the elastic body and in which a liquid is sealed; and a liquid chamber that is disposed in the liquid chamber. And a mass member having a predetermined weight, and an elastic support member having a base end connected to the inner wall surface of the liquid chamber and a mass member connected to the distal end side to support the mass member elastically deformable. And anti-vibration device. 2. The vibration isolator according to claim 1, wherein a base end of the elastic support member is connected to an inner peripheral side of the outer cylinder.