JPH0579530A - Vibration isolator - Google Patents

Abstract

PURPOSE:To ensure a vibrationproofing characteristic, and to ensure damping and absorption of vibration over wide frequencies by providing a press member that is abutted on a diaphragm so as to inhibit movement of the diaphragm, and a driving means for having the press member contacted to and separated from the diaphragm. CONSTITUTION:A first mounting member 16 is connected to a vibration source, and a second mounting member 32 is connected to a vibration receiving part. The vibration is supported to the vibration receiving part through the first mounting member 16, an elastic body 34, and the second mounting member 32. A driving means 52 is operated, and the press member 50 is pressed to a diaphragm 22 of a sub-liquid chamber 44 other than a sub-liquid chamber 38 connected to limiting passages 42, 26 that absorb the vibration of a desired frequency. The diaphragm 22 is adhered to the press member 50 and is thus fixed thereto, and the sub-liquid chamber 44, to which the diaphragm 22 is fixed, cannot be contracted. Thus a liquid runs only in the limiting passages 42, 26 that absorb the vibration of the desired frequency, and the vibration of the fixed frequency is assuredly absorbed by resistance as well as liquid columnar resonance at the time when the liquid passes therethrough.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device for use in vehicles, general industrial machinery, etc., which absorbs and damps vibrations from a vibration generator.

[0002]

2. Description of the Related Art An engine of a car is provided with an anti-vibration device as an engine mount between the engine and the vehicle body.
The engine vibration is prevented from being transmitted to the vehicle body. Vibrations generated in the engine include so-called shake vibrations that occur when the vehicle is traveling at high speeds, so-called idle vibrations that occur when the vehicle is idle, and when the vehicle is traveling at approximately 5km / h. , Shake vibration and idle vibration have different frequencies.

A control type engine mount has been proposed in which a plurality of limiting passages having different sizes are provided to absorb vibrations of different frequencies, and the limiting passage corresponding to a desired frequency is switched by an opening / closing valve. ing. However, this anti-vibration device has many components of the on-off valve and has a drawback that the structure is complicated due to problems such as sealing.

As a vibration isolator for solving the above-mentioned drawbacks, a vibration isolator having the same effect as switching the restriction passage by bringing the diaphragm into close contact with the wall surface of the air chamber by utilizing the negative pressure generated in the intake manifold of the engine. Is proposed.

This anti-vibration device is provided with a solenoid valve between the intake manifold and the air chamber. For a restriction passage that does not want liquid to flow back and forth, the intake passage solenoid valve is switched to establish an intake manifold. The diaphragm is fixed by communicating with the air chamber and making the air chamber negative pressure. Further, when the liquid is moved back and forth in the restricted passage, the solenoid valve is switched to communicate the air chamber with the outside air. As a result, the sub-liquid chamber can be expanded and contracted, and when the diaphragm moves due to vibration, air moves back and forth between the air chamber and the outside air through the solenoid valve and the piping such as a rubber hose connecting the solenoid valve and the air chamber.

[0006]

However, the solenoid valve has a small diameter of the internal passage and the diameter of the valve hole and has a large air passage resistance, and the air is not generated even in a pipe such as a rubber hose connecting the solenoid valve and the air chamber. Receive passage resistance. Therefore, in particular,
During high frequency vibration, the air passage becomes clogged and the diaphragm cannot move freely. For this reason, the liquid is less likely to resonate in the liquid column in the restricted passage, so that there is a problem in that the vibration isolation characteristics cannot be secured.

In view of the above facts, it is an object of the present invention to provide a vibration damping device capable of ensuring vibration damping characteristics and reliably damping and absorbing vibrations over a wide frequency range.

[0008]

According to a first aspect of the present invention, there is provided a vibration isolator having a first mounting member connected to one of a vibration generating section and a vibration receiving section, and a vibration detecting section and a vibration receiving section connected to the other. A second mounting member, an elastic body provided between the first mounting member and the second mounting member, and deformable when vibration occurs, and a pressure receiving pressure capable of expanding and contracting the elastic body as a part of a partition wall. A liquid chamber, a plurality of sub-liquid chambers that are separated from the pressure-receiving liquid chamber, a restriction passage that connects the pressure-receiving liquid chamber and the sub-liquid chamber, a diaphragm that forms a partition of the sub-liquid chamber, and the diaphragm. And a driving means for bringing the pressing member into and out of contact with the diaphragm.

A vibration isolator according to a second aspect of the present invention is the vibration isolator according to the first aspect, characterized in that a contact member that abuts against the diaphragm is provided on a side opposite to the pressing member side of the diaphragm. There is.

[0010]

According to the vibration isolator of the present invention, for example, when the first mounting member is connected to the vibration source and the second mounting member is connected to the vibration receiving portion, the vibration is generated by the first mounting member, Elastic body,
It is supported by the vibration receiving portion via the second mounting member. At this time, the vibration is absorbed not only by the resistance based on the internal friction of the elastic body but also by the passage resistance of the liquid flowing through the restriction passage or the liquid column resonance.

Further, when absorbing the vibration of the desired frequency, the driving means is operated to the diaphragm of the sub-liquid chamber other than the sub-liquid chamber connected to the limiting passage for absorbing the vibration of the desired frequency. Press the pressing member. As a result, the diaphragm is fixed in close contact with the pressing member, and the auxiliary liquid chamber to which the diaphragm is fixed cannot be expanded or contracted. Therefore, the liquid flows only through the restriction passage that absorbs the vibration of the desired frequency,
Vibration at a predetermined frequency is reliably absorbed by the resistance and liquid column resonance when the liquid passes.

In the vibration isolator according to the second aspect of the present invention, since the close contact member that comes into contact with the diaphragm is provided on the side opposite to the pressing member side of the diaphragm, the diaphragm is pressed when the pressing member is pressed against the diaphragm. The diaphragm is securely fixed by being sandwiched between the member and the close contact member.

[0013]

【Example】

[First Embodiment] A first embodiment of the vibration isolator 10 according to the present invention will be described with reference to FIGS.

As shown in FIG. 2, the anti-vibration device 10 is provided with a mounting frame 12 for mounting on a vehicle body (not shown), and an annular portion 14 of the mounting frame 12 has a first mounting member. The outer cylinder 16 is inserted. A thin rubber layer 18 is vulcanized and adhered to the inside of the outer cylinder 16. A part of the upper side of the thin rubber layer 18 is a large diaphragm 20 separated from the inner peripheral surface of the outer cylinder 16.
As shown in, the first air chamber 24 is formed between the outer cylinder 16 and the large diaphragm 20. The first air chamber 24 may be communicated with the outside air if necessary.

On the other hand, a part of the lower side of the thin rubber layer 18 is a small diaphragm 22 separated from the inner peripheral surface of the outer cylinder 16. The small diaphragm 22 is formed in a substantially hemispherical shape so as to project inward of the outer cylinder 16. A large diameter hole 17 is formed in the outer cylinder 16 corresponding to the small diaphragm 22, and the large diameter hole 17 is closed by a boss 55 fixed to the outside of the annular member 14. A second air chamber 26 is formed between the small diaphragm 22 and the boss 55,
The air holes 55A provided in the boss 55 communicate with the outside air. The air hole 55A is sized so that air can enter and leave the second air chamber 26 without resistance.

As shown in FIG. 2, an intermediate block 28 and an intermediate block 30 are inserted inside the outer cylinder 16. The intermediate block 28 has flange portions 28 at both ends in the axial direction.
A is formed and the outer peripheral surface is in close contact with the thin rubber layer 18, and the intermediate block 30 is fitted between the flange portions 28A. The intermediate block 30 has a substantially semicircular block shape when viewed from the axial direction of the outer cylinder 16, and the outer peripheral surface thereof is in close contact with the thin rubber layer 18.

A notch 28B is formed in the center of the intermediate block 28 facing the intermediate block 30, and an inner cylinder 32 as a second mounting member penetrates the intermediate block 28. This inner cylinder 3
2 is disposed coaxially with the outer cylinder 16, and a main body rubber 34 as an elastic body is stretched between the outer cylinder 16 and the intermediate block 28. This allows the inner cylinder 32 to move relative to the outer cylinder 16.

As shown in FIG. 1, a part of the outer peripheral surface of the main body rubber 34 is in close contact with the top surface 30A of the intermediate block 30, and a part of the intermediate part is located between the intermediate block 30 and the pressure receiving liquid chamber. A notch 34A forming 36 is formed. Further, between the flange portions 28A of the intermediate block 28, the inner peripheral surface is formed by the intermediate block 28 and the outer peripheral surface is formed by the thin rubber layer 1.
8 and the large diaphragm 20 define a first sub liquid chamber 38.

As shown in FIGS. 2 and 3, a thin groove 40 is formed along the circumferential direction on the outer circumference of the intermediate block 30. One end of the narrow groove 40 is connected to the first sub liquid chamber 38,
The other end is connected to the pressure receiving liquid chamber 36 through the opening 40A, and is surrounded by the outer cylinder 16 to form a first limiting passage 42 for absorbing shake vibration. Further, one end of the intermediate block 30 is connected to the second sub liquid chamber 44, and the other end is formed with an opening 46A formed in the inner peripheral portion of the intermediate block 30.
A second limiting passage 46 for absorbing idle vibration, which has a rectangular longitudinal cross section and is connected to the pressure receiving liquid chamber 36 via the. On the other hand, a cutout 30A is formed in the lower portion of the intermediate block 30, and the cutout 30A is surrounded by the thin rubber layer 18 and the small diaphragm 22 to form a second sub liquid chamber 44. In the second sub liquid chamber 44,
An abutting plate 45 is provided as a substantially hemispherical contact member that is convex toward the side opposite to the small diaphragm 22 side.
The contact plate 45 is separated from the small diaphragm 22 by a predetermined dimension so that it does not come into contact with the small diaphragm 22 when it vibrates. In addition, the contact plate 45 is provided with innumerable small holes 45B, and the liquid 48 in the second auxiliary liquid chamber 44 is formed.
It does not interfere with the distribution of

The pressure receiving liquid chamber 36, the first sub-liquid chamber 38, the second sub-liquid chamber 42, the first limiting passage 42 and the second limiting passage 46 are filled with a liquid 48 such as ethylene glycol. Has been done.

A pressing member 50 is provided in the second air chamber 26.
Are arranged. The pressing member 50 has a close contact surface 50A formed in a substantially hemispherical shape on the small diaphragm 22 side and a flat surface portion 50B formed in a flat surface on the opposite side. At the center of the plane portion 50B, the tip of the movable shaft 54 of the solenoid 52 as a driving means is fixed.
The solenoid 52 is attached to the boss 55. When a voltage is applied to a built-in electromagnetic coil (not shown), a movable iron core (not shown) is attracted by an exciting current to move the movable shaft 5.
4 instantly moves to the electromagnetic coil side (not shown) (direction of arrow U in FIG. 1). Further, when the voltage application to the electromagnetic coil is interrupted, the movable shaft 54 instantly returns to the side opposite to the electromagnetic coil side by the urging force of a built-in spring (not shown).

Therefore, when no voltage is applied to the electromagnetic coil of the solenoid 52, the movable shaft 54 moves to the small diaphragm 22 side as shown in FIG. 4, and the pressing member 50 presses the small diaphragm 22. Pressing member 5
The small diaphragm 22 is sandwiched between 0 and the contact plate 45. On the other hand, when the voltage application is interrupted, the movable shaft 54 moves in the direction away from the small diaphragm 22 and the pressing member 50 separates from the small diaphragm 22.

A control means 56 is connected to the solenoid 52, and the control means 56 causes the solenoid 5 to operate.
The applied voltage of 2 is controlled. Further, the control means 56 is driven by the vehicle power supply, receives the detection signals from at least the vehicle speed sensor 58 and the engine speed sensor 60, detects the vehicle speed and the engine speed, and judges whether the vehicle is idle or shaken. You can

Next, the operation of this embodiment will be described. When a vehicle equipped with the vibration damping device 10 according to the present invention as an engine mout travels at, for example, 70 to 80 km / h, shake vibration (less than 15 Hz) occurs. The control means 56 uses the vehicle speed sensor 58 and the engine speed sensor 60 to determine whether or not shake vibration is occurring. When the control means 56 determines that the shake vibration is occurring, the control means 56 causes the solenoid 5 to move.
Energize 2. As a result, the pressing member 50 is instantaneously moved to the small diaphragm 22 side and the small diaphragm 22 is moved.
And the small diaphragm 22 is sandwiched between the pressing member 50 and the contact plate 45 (see FIG. 4). For this reason,
The movement of the small diaphragm 22 is completely blocked, the second sub-liquid chamber 44 cannot be expanded or contracted, and the liquid 48 becomes the second limiting passage 46.
It stops flowing inside. Therefore, the liquid 48 moves back and forth between the pressure receiving liquid chamber 36 and the first sub liquid chamber 38 through the first restriction passage 42, and the resistance and the liquid column when the liquid 48 passes through the first restriction passage 42. Shake vibration is absorbed by resonance.

When the engine is idling or the vehicle speed is 5 km / h or less, idle vibration (20
˜40 Hz) occurs. The control means 56 determines by the vehicle speed sensor 58 and the engine speed sensor 60 whether or not idle vibration is occurring. When the control means 56 determines that the idle vibration is occurring, the control means 56 causes the solenoid 5
Do not energize 2. Therefore, the pressing member 50 instantly separates the small diaphragm 22 (see FIG. 1), and the second sub-liquid chamber 4
4 can be scaled. In the idle vibration, the first limiting passage 42 is clogged, but the liquid 48 passes through the second limiting passage 46 and moves back and forth between the pressure receiving liquid chamber 36 and the second sub-liquid chamber 44, and then the second limiting passage. The liquid column resonates in 46. As a result, the dynamic spring constant of the vibration isolator 10 is reduced and idle vibration is absorbed. At this time, the air in the second air chamber 26 is
It moves back and forth with the outside air due to the expansion and contraction of the sub liquid chamber 44, but since it does not go through a solenoid valve or piping unlike the conventional vibration isolator, when the second sub liquid chamber 44 expands and contracts, the small diaphragm 22
Can move freely without being obstructed, and can surely reduce the dynamic spring constant. Further, since the vibration isolator 10 of the present invention has a structure in which the pressing member 50 is moved by the solenoid 52 when fixing the diaphragm, compared with the conventional vibration isolator having the structure in which the diaphragm is fixed by negative pressure of air. Switching of anti-vibration characteristics is quick,
Operation is certain.

[Second Embodiment] Anti-vibration device 10 according to the present invention
A second embodiment will be described with reference to FIGS. The same components as those in the first embodiment are designated by the same reference numerals,
The description is omitted.

As shown in FIG. 5, the vibration isolator 10 is provided with a bottom plate 112 as a first mounting member. The bottom plate 112 has a mounting bolt 114 projecting from the lower center thereof and is fixed to a vehicle body of an automobile (not shown) as an example.

Around the bottom plate 112 is a cylindrical standing wall portion 112A bent at a right angle, and a flange portion 112B bent at a right angle is continuously formed at the upper end of the standing wall portion 112A.

A lower end portion of an outer cylinder 116 fixed to the bottom plate 112 is caulked and fixed to the flange portion 112B. A peripheral portion of the large diaphragm 118 is sandwiched between the flange portion 112B and the lower end portion of the outer cylinder 116. An air chamber 120 is formed between the large diaphragm 118 and the bottom plate 112, and is communicated with the outside if necessary.

The upper end of the outer cylinder 116 is an expanded portion 116B having an enlarged inner diameter, and the outer periphery of the main rubber 122 is vulcanized and adhered. A support base 124 as a second mounting member is vulcanized and adhered to the central top portion of the main rubber 122. Further, a part of the main body rubber 122 is extended to a cylindrical portion 116C of the outer cylinder 116 and a part of a lower end portion thereof and is vulcanized and adhered. The support base 124 is an engine mounting portion (not shown), and mounting bolts 126 for fixing the engine are provided upright.

Here, the inner peripheral portion of the outer cylinder 116, the main body rubber 12
2 and the large diaphragm 118, the liquid chamber 12
8 is formed, and the liquid chamber 128 is filled with a liquid 129 such as ethylene glycol.

Further, a limiting passage forming member 130 is arranged in the liquid chamber 128, and the liquid chamber 128 is the pressure receiving liquid chamber 13.
2 and the first sub liquid chamber 134. The restricted passage forming member 130 is formed of a synthetic resin or the like in a substantially hat-shaped cross-section, and the peripheral edge of the lower end is sandwiched between the lower end of the outer cylinder 116 and the large diaphragm 118.

As shown in FIGS. 5 and 6, a narrow groove 144 having a rectangular cross section is formed along the circumferential direction on the outer periphery of the restricted passage constituting member 130. The narrow groove 144 is formed in the outer cylinder 1.
The 16 side is closed by the extension portion of the main body rubber 122 to form a first restriction passage 152. The first restricted passage 152 has a rectangular opening 144 at one end in the longitudinal direction.
It is communicated with the pressure receiving liquid chamber 132 via A, and the other end is communicated with the first auxiliary liquid chamber 134 via the opening 144B.

Further, a rectangular hole 142 is formed in the restricted passage forming member 130 from the outer circumference toward the opposite outer circumference. The end of the rectangular hole 142 communicates with the pressure receiving liquid chamber 132 through the opening 142A to form a second limiting passage 146.

A boss 160 is fixed to the outer periphery of the cylindrical portion 116C of the outer cylinder 116 corresponding to the rectangular hole 142. The boss 160 is provided with a substantially hemispherical concave portion 162 on the side opposite to the cylindrical portion 116C side.
2 is closed by a pressing plate 164. In addition, the boss 160 has an annular recess 166 outside the opening of the recess 162.
Are formed coaxially, and the peripheral portion of the small diaphragm 168 is sandwiched between the annular recess 166 and the pressing plate 164.

A hole 162A is formed in the center of the recess 162, and the hole 162A is communicated with the rectangular hole 142 through a through hole 172 penetrating the outer cylinder 116. The space from the through hole 172 to the small diaphragm 168 is the second sub liquid chamber 170.
A second air chamber 174 is formed between the No. 8 and the pressing plate 164. An air hole 164A is provided in the pressing plate 164, and the second air chamber 174 communicates with the outside air through the air hole 55A.

Inside the second air chamber 174, the pressing member 50 is arranged as in the first embodiment. A solenoid 52 is attached to the outer surface of the pressing plate 164, and a movable shaft 54 of the solenoid 52 penetrates the pressing plate 164, and its tip is fixed to the center of the flat portion 50B of the pressing member 50.

Next, the operation of the second embodiment will be described. In the vibration isolator 10 of this embodiment, a bottom plate 112 is fixed to a vehicle body (not shown) via mounting bolts 114, and an engine is mounted on a support 124 and fixed by mounting bolts 126.

When the vibration is shake vibration (less than 15 Hz), the control means 56 does not energize the solenoid 52 as in the first embodiment. Therefore, as shown by the imaginary line in FIG. 5, the pressing member 50 comes into close contact with the small diaphragm 168,
The second auxiliary liquid chamber 170 cannot be expanded or contracted, and the second restriction passage 1
There is no flow of liquid 129 in 46. As a result, the liquid 129 moves back and forth between the pressure receiving liquid chamber 232 and the first sub liquid chamber 134 through the first restriction passage 152, and the liquid 129.
The shake vibration is absorbed by the resistance and liquid column resonance when passing through the first limiting passage 152.

If the vibration is idle vibration, the control means 56 energizes the solenoid 52. As a result, as shown by the solid line in FIG. 5, the pressing member 50 is separated from the small diaphragm 168 to be in a free state, and the second sub liquid chamber 170 can be expanded and contracted. As a result, the liquid 129 passes through the second restriction passage 146 and passes through the pressure receiving liquid chamber 132 and the second
It moves back and forth between the sub liquid chamber 170, and resonates in the liquid column in the second restriction passage 142 to reduce the dynamic spring constant and absorb the idle vibration.

Like the vibration isolator 10 of the first embodiment, the vibration isolator 10 of the second embodiment resists the air in the second air chamber 174 when the second sub-liquid chamber 170 expands or contracts. Since the small diaphragm 168 can freely move in and out, the small diaphragm 168 can move freely without being obstructed. Therefore, the dynamic spring constant can be reliably reduced to idle vibration.

[Third Embodiment] Anti-vibration device 10 according to the present invention
A third embodiment will be described with reference to FIG. The third
The embodiment is a modification of the second embodiment, and the same components as those in the second embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 7, the iron plate 202 is fixed to the center of the small diaphragm 168 in this embodiment. Further, an electromagnet 200 is attached to the pressing plate 164 instead of the solenoid 52. The tip 200A of the electromagnet 200 is separated from the iron plate 202 by a predetermined dimension so as not to come into contact with the small diaphragm 168 when vibrating. The electromagnet 200 is connected to the control means 56, and when the electromagnet 200 is energized, the electromagnet 200 attracts the iron plate 202. The inner surface of the pressing plate 164 is formed in a trumpet shape so as to be in close contact with the small diaphragm 168 when it is adsorbed.

When the vibration is shake vibration (less than 15 Hz), the control means 56 energizes the electromagnet 200. As a result, the iron plate 202 is attracted to the electromagnet 200, the small diaphragm 168 is brought into close contact with the inner surface of the pressing plate 164, and the second auxiliary liquid chamber 170 cannot be expanded or contracted, so that the flow of the liquid 129 in the second restriction passage 146 is prevented. Disappear. As a result, the liquid 129 moves back and forth between the pressure receiving liquid chamber 232 and the first sub liquid chamber 134 through the first restriction passage 152, and the liquid 129.
The shake vibration is absorbed by the resistance and liquid column resonance when passing through the first limiting passage 152.

When the vibration is idle vibration, the control means 56 does not energize the electromagnet 200. As a result, the adsorption of the iron plate 202 is released, and the small diaphragm 16
8 is in a free state, and the second sub liquid chamber 170 can be expanded and contracted. This allows the liquid 129 to pass through the second restriction passage 146.
Through the pressure receiving liquid chamber 132 and the second auxiliary liquid chamber 170, the liquid column resonates in the second limiting passage 142, the dynamic spring constant is reduced, and the idle vibration is absorbed.

In the vibration isolator 10 of this embodiment, as in the vibration isolator 10 of the above embodiment, when the second auxiliary liquid chamber 170 expands or contracts, the air in the second air chamber 174 can freely move without resistance. Since it can move in and out, the small diaphragm 168 can move freely without being obstructed. Therefore, the dynamic spring constant can be reliably reduced to idle vibration.

In the first and second embodiments, the pressing member 5
Although the solenoid is used as the means for moving 0, the present invention is not limited to this, and other driving means such as a motor may be used.

Further, in the embodiments, the vibration isolator as the engine mount is shown, but the present invention is not limited to this, and it goes without saying that it may be applied to a cabinet mount, a body mount or the like.

In each of the above embodiments, the second air chamber communicates with the outside air through the air hole, but the present invention is not limited to this, and the side of the small diaphragm opposite to the second sub-liquid chamber side is provided. May be configured to directly face the outside air.

[0050]

As described above, since the vibration isolator of the present invention has the above-mentioned structure, it has an excellent effect that the vibration isolating characteristic is secured and the vibration over a wide frequency range can be surely attenuated and absorbed.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of the vibration damping device according to the first embodiment of the present invention.

FIG. 3 is a side view of a restricted passage forming member according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state in which a small diaphragm is in close contact with the vibration damping device according to the first embodiment of the present invention.

FIG. 5 is a sectional view taken along the axis of a vibration control device according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, according to the second embodiment of the present invention.

FIG. 7 is a sectional view taken along the axis of a vibration damping device according to a third embodiment of the present invention.

[Explanation of symbols]

 10 Vibration Isolator 16 Outer Cylinder (First Mounting Member) 20 Large Diaphragm 22 Small Diaphragm 24 Air Chamber 26 Air Chamber 32 Inner Cylinder (Second Mounting Member) 34 Main Rubber (Elastic Body) 36 Pressure-Receiving Liquid Chamber 38 First Sub liquid chamber 42 First limiting passage 44 Second sub liquid chamber 45 Contact plate (adhesive member) 46 Second limiting passage 48 Liquid 50 Pressing member 52 Solenoid (driving means) 112 Bottom plate (first mounting member) 118 Large diaphragm 122 Main body rubber (elastic body) 124 Support base (second mounting member) 132 Pressure receiving liquid chamber 134 First auxiliary liquid chamber 146 Second limiting passage 152 First limiting passage 168 Small diaphragm 170 Second auxiliary liquid chamber 174 Second air chamber

Claims (2)

[Claims] 1. A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other of the vibration generating portion and the vibration receiving portion, and the first mounting member. An elastic body provided between the member and the second mounting member and deformable when vibration occurs, a pressure receiving liquid chamber capable of expanding and contracting with the elastic body as a part of a partition wall, and a plurality of pressure receiving liquid chambers separated from each other. A sub-liquid chamber, a restriction passage that connects the pressure receiving liquid chamber and the sub-liquid chamber, a diaphragm that forms a partition wall of the sub-liquid chamber, and a pressing member that abuts on the diaphragm and prevents movement of the diaphragm. And a drive means for bringing the pressing member into and out of contact with the diaphragm. 2. The vibration isolator according to claim 1, further comprising a contact member that is in contact with the diaphragm on the side opposite to the pressing member side of the diaphragm.