JP2008240841A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control liquid pressure in a liquid chamber with high accuracy and improve durability of a supporting body that elastically supports a movable element to be reciprocable with respect to a stator. <P>SOLUTION: A movable plate 15 is elastically supported by a first supporting rubber elastic plate 14 extending along the radial direction of an outer cylinder 11. A first non-magnetic body 29 and a second non-magnetic body 30 are separately connected to both ends in the reciprocating direction of the movable element 23, respectively. In the movable element 23, the first non-magnetic body 29 is connected to the movable plate 15, and the second non-magnetic body 30 is elastically supported, so that the movable element 23 is elastically supported to be reciprocally movable with respect to the stator 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is applied to, for example, automobiles and industrial machines and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

As this type of vibration isolator, conventionally, as shown in, for example, Patent Document 1 below, an outer cylinder connected to one of a vibration generator and a vibration receiver, and one axial end side of the outer cylinder And an attachment member connected to one of the vibration generating portion and the vibration receiving portion, and the attachment member and the outer cylinder are elastically connected, and the opening at one axial end portion of the outer cylinder is closed. A rubber elastic part that is elastically supported via a support rubber elastic plate at the other axial end of the outer cylinder, and a movable plate that closes an opening at the other axial end of the outer cylinder, A configuration is known that includes a liquid chamber defined by the movable plate and the rubber elastic portion inside the outer cylinder, and a linear actuator that vibrates the movable plate and controls the hydraulic pressure in the liquid chamber. Yes.
By controlling the liquid pressure in the liquid chamber in this way, the vibration from the vibration generating unit is absorbed and the propagation of the vibration to the vibration receiving unit can be suppressed.
The linear actuator is connected to the movable plate and made of a magnetic material. The linear actuator is provided so as to surround the movable element. The stator has a magnetizing coil and the movable element. And a pair of supports that elastically support the child relative to the stator, and the mover can be reciprocated by changing the magnetic force acting on both sides of the reciprocating direction. ing.
JP 2006-300307 A

  In recent years, for example, the reciprocating behavior of the mover, such as amplitude and period, is stabilized, the fluid pressure in the liquid chamber can be controlled with high accuracy, and the mover can be reciprocated relative to the stator. There is a demand for a vibration isolator in which the durability of a pair of supports is improved.

  The present invention has been made in consideration of such circumstances, and the durability of the support body that can control the hydraulic pressure in the liquid chamber with high accuracy and elastically supports the movable element so as to reciprocate with respect to the stator. An object of the present invention is to provide a vibration isolator with improved performance.

In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention includes an outer cylinder connected to one of the vibration generating unit and the vibration receiving unit, and the axial direction of the outer cylinder. An attachment member disposed on one end side and connected to one of the vibration generating portion and the vibration receiving portion, and the attachment member and the outer cylinder are elastically connected to each other, and an opening at one axial end portion of the outer cylinder is provided. A rubber elastic portion that closes the portion, a movable plate that closes the opening at the other axial end of the outer cylinder in an elastically supported state, and the movable plate and the rubber elastic portion inside the outer cylinder. And a linear actuator that controls the liquid pressure in the liquid chamber by exciting the movable plate, and a movable element formed of a magnetic material on the linear actuator, and the movable element And is provided to surround The vibration isolator is provided with a stator that includes a magnetizing coil, and the movable plate is elastically supported by a first support rubber elastic plate extending along a radial direction of the outer cylinder, and A first non-magnetic body and a second non-magnetic body are separately connected to both ends of the reciprocating direction of the mover, respectively, and the mover has the first non-magnetic body connected to the movable plate, The second non-magnetic material is elastically supported so as to be reciprocally movable with respect to the stator.
In this invention, since the first non-magnetic body and the second non-magnetic body are respectively connected to both ends of the reciprocating direction of the mover, it becomes possible to narrow the magnetic path formed in the mover, The density of the magnetic flux passing through the mover can be increased. Therefore, it is possible to improve the thrust in the reciprocating direction acting on the mover, to stabilize the reciprocating behavior of the mover such as amplitude and period, and to control the fluid pressure in the liquid chamber with high accuracy. can do.
Moreover, since at least one of the pair of supports that elastically support the mover with respect to the stator so as to reciprocate is not the leaf spring but the first support rubber elastic plate, As compared with the case where both are formed by leaf springs, durability can be improved.

Here, the second non-magnetic body may be elastically supported by a second support rubber elastic plate extending along a radial direction of the outer cylinder.
In this case, the pair of supports that elastically support the movable element with respect to the stator so as to reciprocate are not the leaf springs but the first supporting rubber elastic plate and the second supporting rubber elastic plate. The durability of both supports can be improved.
Further, since the mover is elastically supported by the first support rubber elastic plate and the second support rubber elastic plate so as to reciprocate with respect to the stator in this way, for example, when the vibration isolator is assembled, the axis of the mover Is inclined or displaced with respect to the axis of the stator, the first support rubber elastic plate and the second support rubber elasticity are affected by the magnetic force acting on the mover from the stator side through the mover. It is possible to make the axis of the mover coincide with the axis of the stator while elastically deforming the plate in the respective radial directions. Therefore, the above-described effects can be achieved more reliably, and the assembly time of the vibration isolator can be shortened.

In addition, each of the first nonmagnetic body and the second nonmagnetic body may be formed of a material having a specific gravity smaller than a specific gravity of a material forming the mover.
In this case, since the first nonmagnetic body and the second nonmagnetic body are each formed of a material having a specific gravity smaller than that of the material forming the mover, the mover is moved when the mover is reciprocated. It is possible to suppress the inertial force acting on the movable member, and it is possible to further reliably stabilize the reciprocating behavior of the mover.
In addition, since the inertial force acting on the mover is suppressed in this way, at least one of the pair of support bodies that elastically support the mover so as to reciprocate with respect to the stator as described above is provided by a leaf spring. Since the first support rubber elastic plate having low rigidity makes the radial position of the mover unstable, when the mover is reciprocated, its axis is inclined with respect to the axis of the stator. It can also suppress that it becomes easy to shift | deviate.

  According to the present invention, the hydraulic pressure in the liquid chamber can be controlled with high accuracy, and the durability of the support body that elastically supports the movable element so as to reciprocate with respect to the stator can be improved. .

  Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIG. The vibration isolator 10 is arranged on the outer cylinder 11 connected to one of the vibration generating part and the vibration receiving part and on the axial one end part 11a side of the outer cylinder 11, and the vibration generating part and the vibration receiving part A mounting member 12 connected to one of the other, a rubber elastic portion 13 that elastically connects the mounting member 12 and the outer cylinder 11, and closes an opening at one axial end 11 a of the outer cylinder 11, and elastic A movable plate 15 that closes the opening at the other axial end 11b of the outer cylinder 11 in a supported state, and a main liquid chamber (liquid) defined by the movable plate 15 and the rubber elastic portion 13 inside the outer cylinder 11. Chamber) 16 and a linear actuator 17 that vibrates the movable plate 15 to control the hydraulic pressure in the main liquid chamber 16.

When the vibration isolator 10 is mounted on, for example, an automobile, the attachment member 12 is connected to an engine as a vibration generating unit, while the outer cylinder 11 is connected to a vehicle body as a vibration receiving unit via a bracket (not shown). As a result, the vibration of the engine is prevented from propagating to the vehicle body.
The outer cylinder 11, the mounting member 12, the rubber elastic portion 13, the movable plate 15, and the linear actuator 17 are each disposed on a common axis. Hereinafter, this common axis is referred to as a central axis O.

Here, in the present embodiment, the outer cylinder 11 includes a first outer cylinder 18 and a second outer cylinder 19 fitted into the first outer cylinder 18.
A side opening is formed in the first outer cylinder 18, and a diaphragm 20 that closes the side opening is provided. A plurality of the side opening portions are formed in the first outer cylinder 18. In the illustrated example, the side opening portions are formed at positions facing each other across the central axis O in the radial direction, and a diaphragm is formed in each side opening portion. 20 are provided separately.

  Both ends of the second outer cylinder 19 are fitted into the inner peripheral surface of the outer cylinder 11 in a liquid-tight state, and a space is formed between the outer peripheral surface of the second outer cylinder 19 and the diaphragm 20. As shown in FIG. In the illustrated example, the rubber elastic portion 13 is connected to the inner peripheral surface on the upper side in the central axis O direction in the axially inner portion of the second outer cylinder 19.

  As described above, the main liquid chamber 16 is defined by the rubber elastic portion 13, the inner peripheral surface of the second outer cylinder 19, and the movable plate 15, and the diaphragm 20, the inner peripheral surface of the first outer cylinder 18, and the second outer cylinder 19. A secondary liquid chamber 21 is defined by the outer peripheral surface of the second liquid chamber 21. The main liquid chamber 16 has the rubber elastic portion 13 as a part of the partition wall, and the inner volume changes as the rubber elastic portion 13 is deformed. The sub-liquid chamber 21 is sealed with the diaphragm 20 as a part of the partition wall. The internal volume changes according to the pressure change of the liquid. The main liquid chamber 16 and the sub liquid chamber 21 are filled with, for example, ethylene glycol, water, silicone oil, or the like.

  In the main liquid chamber 16, a ring-shaped orifice member 22 is fitted on the inner peripheral surface of the second outer cylinder 19 in the axially inner portion. An orifice channel 22a extending in the circumferential direction is formed on the outer peripheral surface of the orifice member 22, and a communication hole 22b that opens to the orifice channel 22a is formed on the inner peripheral surface of the orifice member 22. The main liquid chamber 16 and the sub liquid chamber 21 communicate with each other through the communication hole 22b, the orifice channel 22a, and the communication hole 19a formed in the axially inner portion of the second outer cylinder 19.

Here, the movable plate 15 has a circular shape in plan view, and the inner peripheral edge portion of the first support rubber elastic plate 14 having an annular shape in plan view is vulcanized and bonded to the outer peripheral edge portion over the entire circumference. Further, the outer peripheral surface of the first support rubber elastic plate 14 is vulcanized and bonded to the inner peripheral surface of the metal first ring support portion 15a over the entire periphery. The first joined body 33 including the movable plate 15, the first support rubber elastic plate 14 and the first ring support portion 15a is point-symmetric with respect to the central axis O. Further, the thickness of the first support rubber elastic plate 14 gradually increases from the outer peripheral edge side of the movable plate 15 toward the radially outer side, and the thickness is equal over the entire circumference at the same radial position. . Furthermore, the front and back surfaces of the first support rubber elastic plate 14 extend along the radial direction of the outer cylinder 11.
As described above, the movable plate 15 is elastically supported via the first support rubber elastic plate 14.

  The linear actuator 17 is provided on the opposite side of the main liquid chamber 16 that sandwiches the movable plate 15 in the direction of the central axis O. The linear actuator 17 includes a mover 23 made of a magnetic material, and a stator 24 provided so as to surround the mover 23 from the outside in the radial direction and having a magnetizing coil. I have.

The mover 23 has a cylindrical shape and is provided such that its axis extends along the reciprocating direction. In the illustrated example, the axis of the mover 23 is arranged on the central axis O.
Then, by changing the amount of current flowing through the coil and changing the magnetic force acting on both sides of the mover 23 in the reciprocating direction, the mover 23 is reciprocated.

 A permanent magnet portion 24 a in which different magnetic poles are arranged adjacent to each other in the reciprocating direction of the mover 23 is provided on a portion of the inner peripheral surface of the stator 24 facing the outer periphery of the mover 23. In the illustrated example, the length of the mover 23 is longer than the maximum reciprocating distance of the mover 23 than the length of the permanent magnet portion 24a. Further, in the equilibrium state before the current is supplied to the coil, the positions of the central portions in the central axis O direction of the central portions in the axial directions of the mover 23 and the permanent magnet portion 24a coincide with each other.

 The outer cylinder 11, the first ring member 15 a of the first joined body 33, and the linear actuator 17 described above are fitted to the inner peripheral surface of the bottomed cylindrical outer cylinder portion 28.

 Further, in the present embodiment, when the movable plate 15 is reciprocated by the linear actuator 17 at a position facing the movable plate 15 in the reciprocating direction in the outer cylinder 11, the amount of movement is collided. A movement amount suppressing means 26 for suppressing is provided. In the illustrated example, the movement amount suppression means 26 is a plate member projecting radially inward from the inner peripheral surface of the outer cylinder 11, and the outer peripheral edge portion of the movable plate 15 and the first support rubber. The elastic plate 14 is arranged so as to cover the entire circumference from the main liquid chamber 16 side. The movement amount suppressing means 26 is provided between the orifice member 22, the movable plate 15 and the first support rubber elastic plate 14, and is not in contact with the first support rubber elastic plate 14 and the movable plate 15. .

  From the above, when the movable plate 15 is moved toward the main liquid chamber 16 side by the linear actuator 17 because the internal pressure of the main liquid chamber 16 suddenly becomes a negative pressure state, the movement amount is suppressed. The amount of movement is suppressed by colliding with the means 26.

  Further, in the illustrated example, a buffer material 27 is provided on the movable plate 15, and when the movable plate 15 is reciprocated by the linear actuator 17, the movable plate 15 collides with the movement amount suppressing means 26 via the buffer material 27. It has become. The buffer material 27 is made of, for example, a rubber-like elastic material. Further, in the illustrated example, the buffer material 27 is disposed at the outer peripheral edge portion on the surface of the movable plate 15 and is formed integrally with the first support rubber elastic plate 14, and extends from the surface of the movable plate 15 in the direction of the central axis O. Protruding.

  In the present embodiment, the first non-magnetic body 29 and the second non-magnetic body 30 are respectively connected to both ends of the mover 23 in the reciprocating direction. In the illustrated example, male screw portions 23a having a smaller diameter than the mover 23 are respectively provided on both end surfaces of the mover 23 in the reciprocating direction, and each male screw portion 23a has a cylindrical first non-magnetic body 29 and The second nonmagnetic body 30 is screwed separately. The mover 23 is connected to the movable plate 15 via the first nonmagnetic material 29. In the illustrated example, the movable plate 15 and the first nonmagnetic body 29 are integrally formed of the same material. The first nonmagnetic material 29 is connected to the radial center of the movable plate 15. Accordingly, in the present embodiment, the first joined body 33 includes the movable plate 15, the first nonmagnetic body 29, the first support rubber elastic plate 14, and the first ring support portion 15 a, and the central axis O is It is point-symmetric with reference.

  In the present embodiment, the second non-magnetic body 30 is elastically supported by the second support rubber elastic plate 31 extending along the radial direction of the outer cylinder 11. In the illustrated example, the inner peripheral surface of the second supporting rubber elastic plate 31 having a circular shape in plan view is vulcanized and bonded to the outer peripheral surface of the cylindrical second non-magnetic body 30 over the entire periphery. Further, the outer peripheral surface of the second support rubber elastic plate 31 is vulcanized and bonded to the inner peripheral surface of the metal second ring support portion 32 over the entire periphery. The second ring support portion 32 is fitted to the inner peripheral surface of the outer cylinder portion 28.

The second joined body 34 including the second non-magnetic body 30, the second support rubber elastic plate 31, and the second ring support portion 32 is point-symmetric with respect to the central axis O. Further, the second joined body 34 is disposed outward of the stator 24 in the direction of the central axis O. Furthermore, the thickness of the second support rubber elastic plate 31 is the same over the entire area.
As described above, the mover 23 is elastically supported by the first support rubber elastic plate 14 and the second support rubber elastic plate 31 so as to reciprocate with respect to the stator 24.

  Furthermore, in the present embodiment, the first and second nonmagnetic bodies 29 and 30 are each a nonmagnetic material and a material having a specific gravity smaller than that of the material forming the mover 23, for example, pure Al or Al alloy. Alternatively, it is formed of a resin material or the like. The first and second nonmagnetic bodies 29 and 30 have the same shape and size.

  The first joined body 33, the second joined body 34, and the linear actuator 17 are separately configured, and the vibration isolator 10 is configured by fitting these into the outer cylinder portion 28 separately. ing.

  Here, the first joined body 33 is formed through an insert molding process in which the movable plate 15, the first nonmagnetic body 29, and the first ring support portion 15a are used as insert products. The second joined body 34 is formed through an insert molding process using the second non-magnetic body 30 and the second ring support portion 32 as inserts.

 As described above, according to the vibration isolator 10 according to the present embodiment, the first nonmagnetic body 29 and the second nonmagnetic body 30 are respectively connected to both ends of the movable element 23 in the reciprocating direction. The magnetic path formed in the mover 23 can be narrowed, and the density of the magnetic flux passing through the mover 23 can be increased. Therefore, the thrust in the reciprocating direction acting on the mover 23 can be improved, and the reciprocating behavior of the mover 23 such as the amplitude and period can be stabilized, and the hydraulic pressure in the main liquid chamber 16 can be stabilized. Can be controlled with high accuracy.

Further, the pair of supports that elastically support the movable element 23 with respect to the stator 24 so as to reciprocate are the first support rubber elastic plate 14 and the second support rubber elastic plate 31 instead of the leaf springs. The durability can be improved compared to the case where both of these supports are formed by leaf springs.
Furthermore, in this embodiment, since the 1st, 2nd nonmagnetic bodies 29 and 30 are respectively the same shape and size, the reciprocating behavior of the needle | mover 23 can be stabilized reliably.

 Further, since the mover 23 is elastically supported by the first support rubber elastic plate 14 and the second support rubber elastic plate 31 so as to reciprocate with respect to the stator 24 in this way, for example, when the vibration isolator 10 is assembled. Even if the axis of the mover 23 is tilted or displaced with respect to the axis of the stator 24, the first magnetic force acts on the mover 23 from the stator 24 side via the mover 23. It is possible to make the axis of the mover 23 coincide with the axis of the stator 24 while elastically deforming the support rubber elastic plate 14 and the second support rubber elastic plate 31 in the respective radial directions. Therefore, the above-described effects can be achieved more reliably, and the assembling time of the vibration isolator 10 can be shortened.

Further, in the present embodiment, the first non-magnetic body 29 and the second non-magnetic body 30 are each formed of a material having a specific gravity smaller than that of the material forming the mover 23. It is possible to suppress the inertial force acting on the movable element 23 when the movable element 23 is moved, and the reciprocating behavior of the movable element 23 can be further stabilized.
Further, since the inertial force acting on the mover 23 is suppressed in this way, the mover 23 can be reciprocated with respect to the stator 24 by the first and second support rubber elastic plates 14 and 31 instead of the leaf spring. Due to the elastic support, the radial position of the mover 23 becomes unstable, and when the mover 23 is reciprocated, its axis is easily inclined or displaced with respect to the axis of the stator 24. It can also be suppressed.

  Further, in the present embodiment, the first joined body 33 is point-symmetric with respect to the central axis O, and the thickness of the first support rubber elastic plate 14 is the entire circumference at the same radial position. In addition, since the first joined body 33 is formed through an insert molding process, even if the first support rubber elastic plate 14 contracts due to cooling during mold opening, the movable plate 15 and the first It is possible to prevent the nonmagnetic material 29 from being displaced with respect to the axis of the first support rubber elastic plate 14, and the first bonded body 33 can be formed with high accuracy.

  Further, the second bonded body 34 is also point-symmetric with respect to the central axis O, and the second supporting rubber elastic plate 31 has the same thickness over the entire region, and is formed through an insert molding process. Therefore, it is possible to prevent the second non-magnetic body 30 from being displaced with respect to the axis of the second support rubber elastic plate 31, and the second bonded body 34 can be formed with high accuracy. .

 Further, in the present embodiment, since the movement amount suppressing means 26 is provided in the outer cylinder 11, for example, a large amplitude vibration is applied to the vibration isolator 10, and the internal pressure of the main liquid chamber 16 suddenly becomes a negative pressure state. As a result, even if it is attempted to move the movable plate 15 largely toward the main liquid chamber 16 side by the linear actuator 17, the movement amount of the movable plate 15 can be suppressed by the movement amount suppression means 26. It is possible to prevent the first support rubber elastic plate 14 and the second support rubber elastic plate 31 from being largely deformed until they are broken, for example.

 Further, in the present embodiment, when the movable plate 15 is reciprocated by the movable element 23, the movable plate 15 collides with the movement amount suppressing means 26 via the buffer material 27. By providing the movement amount suppressing means 26, an impact force acts on the entire vibration isolator 10, and the vibration control performance of the vibration isolator 10 is reduced, for example, it becomes difficult to control the hydraulic pressure of the main liquid chamber 16. Can be prevented.

In addition, since the buffer material 27 is provided, it is possible to suppress abnormal noise from being generated when the vehicle collides as described above, or the collision portion from being easily damaged.
Furthermore, in order to return the mover 23 to the initial position with respect to the stator 24, not only the restoring force of the first support rubber elastic plate 14 and the second support rubber elastic plate 31 but also the restoring force of the buffer material 27. Can also be made to act. Therefore, in order to improve the vibration damping performance of the vibration isolator 10, even if the thrust in the reciprocating direction applied to the mover 23 is increased as described above, the mover 23 can be returned to the initial position. Sufficient restoring force can be imparted.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, although the movement amount suppressing means 26 and the buffer material 27 are provided in the embodiment, these 26 and 27 may not be provided. Further, although the buffer material 27 is provided on the movable plate 15, it may be provided on the movement amount suppression means 26. Furthermore, in the said embodiment, although the board member protruded toward the radial direction inner side of the outer cylinder 11 was shown as the movement amount suppression means 26, not only this but a various structure is employable.

  In the above embodiment, the second non-magnetic body 30 is elastically supported by the second support rubber elastic plate 31. Instead, for example, the second non-magnetic body 30 is connected to the mover 23 on both end surfaces of the second non-magnetic body 30. The second non-magnetic body 30 may be elastically supported by interposing, for example, a coil spring or the like between the end surface opposite to the end surface and the bottom surface 28a in the outer cylindrical portion 28, or a plate You may make it elastically support the 2nd nonmagnetic body 30 with the leaf | plate spring provided so that the surface might extend along the radial direction of the outer cylinder 11. FIG.

Furthermore, in the said embodiment, although the material of specific gravity smaller than the specific gravity of the material which is a nonmagnetic material and forms the needle | mover 23 was shown as a material which forms the 1st, 2nd nonmagnetic bodies 29 and 30, As long as it is at least a nonmagnetic material, the specific gravity may be equal to or higher than the specific gravity of the material forming the mover 23.
Furthermore, the mover 23 and the first and second non-magnetic bodies 29 and 30 are not limited to the above-described embodiment, and may be coupled by, for example, press-fitting.
Further, after the movable plate 15 and the first non-magnetic body 29 are formed as separate parts, they may be coupled by, for example, fastening or press-fitting.

  The hydraulic pressure in the liquid chamber can be controlled with high accuracy, and the durability of the support body that elastically supports the movable element so as to reciprocate with respect to the stator can be improved.

It is a longitudinal cross-sectional view of the vibration isolator shown as one Embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Antivibration apparatus 11 Outer cylinder 11a One axial end part of outer cylinder 11b Other axial end part of outer cylinder 12 Mounting member 13 Rubber elastic part 14 First support rubber elastic plate 15 Movable plate 16 Main liquid chamber (liquid chamber)
17 linear actuator 23 mover 24 stator 29 first nonmagnetic material 30 second nonmagnetic material 31 second support rubber elastic plate

Claims (3)

An outer cylinder coupled to one of the vibration generator and the vibration receiver;
An attachment member disposed on one end side in the axial direction of the outer cylinder and connected to one of the vibration generating unit and the vibration receiving unit;
A rubber elastic portion that elastically connects the mounting member and the outer cylinder, and closes an opening at one axial end of the outer cylinder;
A movable plate that closes the opening at the other axial end of the outer cylinder in an elastically supported state;
A liquid chamber defined by the movable plate and the rubber elastic portion inside the outer cylinder;
A linear actuator that vibrates the movable plate and controls the fluid pressure in the fluid chamber,
The linear actuator is provided with a mover made of a magnetic material, and a vibration isolator provided with a stator having a magnetizing coil provided therein so as to surround the mover,
The movable plate is elastically supported by a first support rubber elastic plate extending along the radial direction of the outer cylinder, and a first nonmagnetic material and a second nonmagnetic material are respectively provided at both ends of the movable element in the reciprocating direction. The bodies are connected separately,
The movable element is elastically supported so that the first nonmagnetic body is connected to the movable plate and the second nonmagnetic body is elastically supported so that the movable element can reciprocate with respect to the stator. An anti-vibration device characterized by that. The vibration isolator according to claim 1,
The vibration isolator, wherein the second non-magnetic body is elastically supported by a second support rubber elastic plate extending along a radial direction of the outer cylinder. The vibration isolator according to claim 1 or 2,
Each of the first nonmagnetic body and the second nonmagnetic body is formed of a material having a specific gravity smaller than a specific gravity of a material forming the movable element.

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