JPH1130267A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of large stress and strain to an elastic body so as to improve durability. SOLUTION: An elastic body 16 is disposed between an inner cylinder fitting 14 and an intermediate cylinder 18. A pair of flange parts 16B protruded in disc shape are provided at both axial end parts of the elastic body 16, and recessed parts 28 are formed pair by pair at the mutually opposed faces and on the reverse side faces of a pair of flange parts 16. Opening recessed parts 16C of the elastic body 16 are sealed with an outer cylinder fitting 12 by fitting the intermediate cylinder 18 to the outer cylinder fitting 12, and a pair of space with internal walls formed by the opening recessed parts 16C of the elastic body 16, the outer cylinder fitting 12 constitute a right liquid chamber 26A and a left liquid chamber 26B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for absorbing vibration from a vibration generator, and is 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, as shown in FIGS. 6 and 7, a rubber elastic body 116, which is vulcanized and bonded between an inner cylinder 114 and an intermediate cylinder 118, and a liquid are sealed in the vibration isolator. The pair of liquid chambers 120A and 120B and the pair of liquid chambers 120 formed by the groove 118A of the intermediate cylinder 118.
There is known one provided with a restriction passage 122 connecting between A and 120B, and an outer cylinder 112 forming an outer frame.

When the vehicle travels and vibrates, the vibration control function of the elastic body 116 and the pair of liquid chambers 120 are provided.
A, by viscous resistance of liquid in 120B, liquid column resonance, etc.
Vibration is absorbed to attenuate the vibration and transmission of the vibration is prevented.

In the case of this vibration isolator, the inner and outer cylinders 112, 11
Vibration is input in the vertical direction (direction of arrow A) orthogonal to the axial direction of No. 4, but as shown in FIGS. 6 and 7, the stopper 124 made of iron or resin is vertically projected from the inner cylinder 114. In addition, the displacement of the inner cylinder 114 is limited, and the durability of the elastic body 116 against vibration is ensured.

[0006]

However, even if the stopper 124 is provided as described above, the inner and outer cylinders 112 and 114 are not required.
When vibration is input from the vertical direction orthogonal to the axial direction of
There is a point where stress and strain are intensively generated in the elastic body 116, and the rubber material forming the elastic body 116 is deteriorated from this part, and has a disadvantage that durability is reduced.

In particular, since the elastic body 116 cannot be sufficiently deformed in accordance with the stress at a portion where the elastic body 116 is bonded to the inner cylinder 114, a large surface is formed on the surface of the elastic body 116 around the inner cylinder 114. Stress and strain may occur.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a vibration isolator having improved durability by preventing large stress and strain from being generated in an elastic body.

[0009]

According to a first aspect of the present invention, there is provided a vibration isolator having a cylindrical outer cylinder connected to one of a vibration generating section and a vibration receiving section, and a cylindrical outer cylinder connected to the other of the vibration generating section and the vibration receiving section. An inner cylinder connected and arranged inside the outer cylinder, an elastic body having a hollow portion formed between the outer cylinder and the inner cylinder and formed to be elastically deformable and having a recessed portion; and an elastic body. And a liquid chamber in which a liquid is sealed by using an elastic body as a part of a partition wall.

According to a second aspect of the present invention, there is provided the vibration isolator according to the first aspect, wherein at least one pair of the bulges is formed on the elastic body so as to sandwich the inner 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 intermediate cylinder is fixed to an outer peripheral portion of an elastic body formed between the outer cylinder and the inner cylinder so as to be elastically deformable, and the intermediate cylinder is fitted to an inner peripheral surface of the outer cylinder. Further, a liquid chamber is provided in which liquid is sealed using the elastic body as a part of the partition wall. Further, a hollow portion is formed in the elastic body which is formed to be elastically deformable.

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.

On the other hand, since the hollow portion is formed in the elastic body, when vibration is input from a direction perpendicular to the axial direction of the inner and outer cylinders, the portion around the hollow portion is like a bellows. , The elastic body is easily deformed, and it is difficult for the elastic body to be subjected to intensive stress and strain during compression and tension.

Therefore, the elastic body does not deteriorate and the durability does not decrease. As a result, the durability of the vibration isolator is improved.

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 at least one pair of the burrs is formed on the elastic body so as to sandwich the inner cylinder. Therefore, according to the configuration of the present invention, if the pair of bulges and the inner cylinder are arranged side by side along the main vibration direction, the elastic body is more easily deformed when vibration is input from the main vibration direction. As a result, the durability of the vibration isolator is further improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolator according to a first embodiment of the present invention is shown in FIGS. 1 to 4, 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 includes 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 that the stopper metal fitting 20 projects in the X direction which is the left and right direction in FIG. The stopper metal fittings 20 are
This serves as a stopper that suppresses excessive displacement of the inner cylinder fitting 14 in the X direction, which is the main vibration direction of the vibration isolator 10.

On the other hand, the inner cylindrical fitting 14 and the outer cylindrical fitting 12
Between them, a rubber elastic body 16 whose inside is vulcanized and adhered to the inner tube fitting 14 is fixed.

As shown in FIG. 3, a pair of flange portions 16B are provided at both ends in the axial direction of the elastic body 16 so as to protrude in a disk shape along the inner peripheral surface of the outer cylinder fitting 12. On each of the surfaces of the pair of flange portions 16B opposite to each other and opposite to each other, a pair of recessed portions 28 are formed. That is, the pair of bulges 28 are formed at positions closer to the inner cylinder 14 and arranged linearly across the inner cylinder 14.

As shown in FIGS. 1 and 4, between the pair of flange portions 16B, the outer peripheral portion extends from the periphery of the inner cylindrical member 14 along a direction intersecting the direction in which the stopper member 20 projects. The pair of connecting portions 16A are
It is formed as a part of. And this elastic body 16
Extends to the periphery of the stopper fitting 20, and the covering rubber 2
2 covers the stopper fitting 20.

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, a cylindrical intermediate cylinder 18 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 is opposed to the stopper fitting 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 they 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 tube fitting 12, and the pair of spaces in which the inner wall surface is formed by the opening concave portion 16C of the elastic member 16 and the outer tube 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 elastic stoppers 32 each formed in an arc shape are installed. .

On the outer peripheral side of these elastic stoppers 32, support fittings 36 for fixing the elastic stopper 32 to the inner peripheral surface of the outer cylindrical fitting 12 are arranged, respectively. It is sandwiched between the tube fitting 12 and the intermediate tube 18. Further, abutment fittings 38 that can abut against the stopper fitting 20 are arranged at positions on the inner peripheral side of the elastic stopper 32 and opposed to the stopper fitting 20, respectively.

The plate-shaped support member 36 and the abutment member 38 are respectively vulcanized and bonded to a rubber stopper body 34, and are attached to the support member 36 and the abutment member 38. Is sandwiched between them.

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.

Further, the outer cylinder fitting 12 of the vibration isolator 10 is fitted and connected to the vehicle body side, and the inner cylinder fitting 14 is connected to the wheel side via bolts. As shown in FIG. 3, a pair of burrs 28 provided on each of the flange portions 16B are arranged along the main vibration direction (X direction in FIG. 3), which is a direction in which vibration is mainly input while sandwiching the inner tube fitting 14. The anti-vibration devices 10 are arranged so as to line up. That is,
When assembling the vibration isolator 10 to the vehicle, the pair of straightening portions 28 are arranged so as to be aligned along the direction in which the load of the vehicle is applied, which is the same direction as the main vibration direction.

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. A pair of liquid chambers 26A and 26 in which the liquid is sealed with the elastic body 16 as a part of the partition wall.
B is provided, and the orifice 30 is
A and 26B are communicated to allow the liquid to flow.

Further, a hollow portion 28 is formed in the elastic body 16 which is formed so as to be elastically deformable.

Therefore, when vibration is input to the inner cylindrical member 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
As a result, the liquid in the pair of liquid chambers 26A and 26B flows through the orifice 30, and suppresses vibration by viscous resistance of the liquid and liquid column resonance. 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.

On the other hand, since the hollow portion 28 is provided on the elastic body 16, when the vibration is input from the main vibration direction (X direction) which is a direction orthogonal to the axial direction of the inner and outer cylinders. The portion around the bulging portion 28 acts like a bellows, so that the elastic body 16 is easily deformed, and it is difficult for the elastic body 16 to be intensively stressed and strained during compression and tension.

Accordingly, the elastic body 16 is not deteriorated and its durability is not lowered. As a result, the durability of the vibration isolator 10 is improved.

Further, in the present embodiment, a pair of straightening portions 28 are formed on the pair of flange portions 16B so as to sandwich the inner cylindrical fitting 14, and the pair of straightening portions 28 and the inner cylindrical fitting 14 are arranged in the main vibration direction. Each is arranged so that it may be arranged along. Therefore, when vibration is input from the main vibration direction, the elastic body 16 is more easily deformed by these burrs 28, and the durability of the vibration isolator 10 is further improved.

On the other hand, even if the burring portion 28 is formed in the flange portion 16B, it is a thin portion which is compressed near the burring portion 28 when a force is applied along a direction orthogonal to the axial direction of the inner and outer cylinders. The width portion 16D remains on the elastic body 16.
Therefore, when a spring action in this direction is generated on the elastic body 16, a rubber material having a low rubber hardness can be used for the elastic body 16.

As a result, the pair of liquid chambers 26A, 26A
As the volume change of B becomes easier, the orifice 30
The liquid easily flows through the inside, the dynamic spring constant of the vibration isolator 10 is kept low, and the durability of the elastic body 16 is further improved.

On the other hand, the elastic stopper 32 installed on the inner peripheral side of the outer cylinder fitting 12 is provided with the stopper fitting 2 on the inner cylinder fitting 14 side.
0 and restricts excessive relative displacement between the inner cylindrical fitting 14 and the outer cylindrical fitting 12, but when they come into contact with each other, the elastic stopper 32 itself is formed to be elastically deformable. The coating rubber 22 that covers the surface of the metal fitting 20 is not excessively compressed, so that the durability does not decrease.

Next, a vibration isolator according to a second embodiment of the present invention is shown in FIG. 5, and the present 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. 5, the vibration isolator 10 according to the present embodiment has a straightening portion 28 similar to the first embodiment.
However, unlike the first embodiment, the liquid chamber 26
A pair of recessed portions 48 are formed on each of the opposing surfaces of the pair of flange portions 16B on the inner wall surfaces of A and 26B.
That is, as shown in FIG. 5, these straightening portions 48 are located at positions closer to the inner cylindrical fitting 14 and are linearly arranged with the inner cylindrical fitting 14 interposed therebetween, similarly to the straightening portion 28 of the first embodiment. It is formed at the position where it is.

Therefore, by providing the bulges 28 and 48 on both surfaces of the pair of flanges 16B, stress and strain can be further alleviated. Further, it is possible to cope with, for example, a twisting force acting obliquely to a direction orthogonal to the axial direction of the inner and outer cylinders.

In the above-described embodiment, a structure is used in which a pair of liquid chambers communicate with each other through an 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 of the automobile as the vibration receiving portion, and the inner cylinder 14 is connected to the wheel 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. Needless to say,
Further, the shape and dimensions of the elastic body and the like are not limited to those of the embodiment.

[0048]

As described above, the vibration isolator according to the present invention has an excellent effect that durability can be improved by preventing large stress and strain from being generated in the elastic body.

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

FIG. 6 is a sectional view of a conventional vibration isolator.

FIG. 7 is a cross-sectional view of a conventional vibration isolator,
FIG. 7 is a sectional view taken along line 7.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Anti-vibration device 12 Outer cylinder fitting (outer cylinder) 14 Inner cylinder fitting (inner cylinder) 16 Elastic body 18 Intermediate cylinder 26A Right liquid chamber 26B Left liquid chamber 28 Curved part 48 Curved part

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 which is formed between the outer cylinder and the inner cylinder so as to be elastically deformable and has a hollow portion formed in a concave shape, and which is fixed to an outer peripheral portion of the elastic body and is fixed to an inner peripheral surface of the outer cylinder. An anti-vibration device comprising: an intermediate cylinder to be fitted; and a liquid chamber in which a liquid is sealed with an elastic body as a part of a partition. 2. An anti-vibration device according to claim 1, wherein at least one pair of burrs is formed on the elastic body so as to sandwich the inner cylinder.