JPH09126267A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably connect parts and reduce manufacturing cost. SOLUTION: An opening is made at one end of a liquid room forming member 50 and a second diaphragm 68 and a cover body 78 are oppositely arranged at the end via the second diaphragm 68. The opening of the liquid room forming member 50 is closed by the second diaphragm 68 to make a second sub-liquid room 7O with space in the opening and the recessed part 78A of the cover body 78 is closed by the second diaphragm 68 to make a second air room 74. A selector valve 82 is disposed opposite to the liquid room forming member 50 of the cover body 78 and a body 90 around which a coil 84 is wound is in the center of the selector valve 82. A connection pipe 90A projecting to the right side from the top part of the body 90 is connected to a cover body 78.

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 use in vehicles, general industrial machinery and the like, which absorbs and damps vibrations from a vibration generating portion.

[0002]

2. Description of the Related Art A vibration isolator as an engine mount is arranged between an engine of an automobile and a vehicle body to prevent the vibration of the engine from being transmitted to the vehicle body.

Vibrations generated by the engine include so-called shake vibrations that occur when the vehicle is traveling at high speed,
There are so-called idle vibrations that occur during idling and when the vehicle is traveling at about 5 km / h. Generally, the frequency of the shake vibration is less than 15 Hz, whereas the frequency of the idle vibration is 20 to 50 Hz, and the shake vibration and the idle vibration have different frequencies.

A vibration-damping device for absorbing vibrations of a wide range of frequencies is a liquid-filled type in which the main liquid chamber and the sub-liquid chamber are connected by an orifice and the vibration is reduced by a damping action accompanying the flow of the liquid in the orifice. Anti-vibration devices are known.

Further, as this liquid-filled type vibration isolator, as shown in FIG. 6, a sub-liquid chamber 212 is provided in a liquid chamber forming member 210 mounted on the outer peripheral side of the vibration isolator, and the vibration isolator is also provided. This liquid chamber forming member 210 is provided on the outer peripheral side of the device.
The air chamber 216 is provided in the air chamber forming member 214 connected to the air chamber 216, and the air pressure in the air chamber 216, which is arranged to face the sub liquid chamber 212 via the diaphragm 218, is changed by the switching valve 220 to change the characteristics. An anti-vibration device that can be changed has been proposed.

[0006]

These liquid chamber forming members 2 are to be solved.
10 and the air chamber forming member 214 are connected by a screw 222 or the like, and an O-ring 226 or the like is provided between the switching valve 220 and the air chamber forming member 214 to ensure airtightness. The seal structure arranged in the passage portion 224 is adopted. Therefore, the structure becomes complicated, the number of parts increases, and the manufacturing cost of the vibration isolator increases.

On the other hand, when the space between the liquid chamber forming member 210 and the air chamber forming member 214 is screwed, there is a fear that vibration may cause loosening. Further, since the air chamber forming member 214 and the passage portion 224 of the switching valve 220 are separate parts, a large force is applied to the connecting portion between them due to the vibration of the vehicle in which the vibration damping device is mounted, and thus the passage portion 224. Could be damaged.

In order to solve the above-mentioned drawbacks, it is an object of the present invention to provide an anti-vibration device capable of reliably connecting members and reducing the manufacturing cost.

[0009]

According to a first aspect of the present invention, there is provided a vibration isolating device comprising:
A mounting member, a second mounting member connected to the other of the vibration generating unit and the vibration receiving unit, the first mounting member and the second mounting member.
An elastic body that is provided between the mounting member and the mounting member and that is deformed when vibration occurs, a main liquid chamber that is expandable and contractible by using the elastic body as a part of a partition wall, and a liquid chamber in which an opening is formed. A forming member, a sub-liquid chamber formed by a space in the opening and communicating with the main liquid chamber via a restriction passage, and a part of a partition wall of the sub-liquid chamber that is arranged to face the opening. A deformable diaphragm that constitutes a member, a cover body that sandwiches the diaphragm between the liquid chamber forming member, and forms an air chamber in which gas is sealed between the diaphragm, and the air chamber to the atmosphere. A switching valve that can be in an open state for communication and a closed state for closing the air chamber and the atmosphere, and forms a flow path in the switching valve connected to the air chamber and is formed integrally with the cover body. And a passage section .

According to a second aspect of the invention, in the vibration isolator, a first mounting member connected to one of the vibration generating portion and the vibration receiving portion and a second mounting member connected to the other of the vibration generating portion and the vibration receiving portion. A mounting member, an elastic body provided between the first mounting member and the second mounting member, and deformable when vibration occurs, and the elastic body is expandable and contractible as a part of a partition wall and liquid is sealed therein. A main liquid chamber, a liquid chamber forming member having an opening formed therein, a sub liquid chamber formed by a space in the opening and communicating with the main liquid chamber via a restriction passage, and the sub liquid chamber facing the opening. And a deformable diaphragm that forms a part of the partition wall of the sub-liquid chamber and the liquid chamber forming member is crimped and connected to the liquid chamber forming member. An air chamber that holds the gas and that is filled with the diaphragm. A cover member made of resin, a switching valve that can be in an open state in which the air chamber communicates with the atmosphere and a closed state in which the air chamber and the atmosphere are closed, and the inside of the switching valve connected to the air chamber A resin-made passage portion that forms a flow path and is formed integrally with the cover body.

The operation of the vibration isolator according to claim 1 will be described below. The vibration from the vibration generator is transmitted to the elastic body via the first mounting member or the second mounting member. At this time, the vibration is absorbed by the resistance based on the internal friction of the elastic body, and is also absorbed by the passage resistance of the liquid flowing through the restriction passage or the liquid column resonance by expanding and contracting the main liquid chamber having the elastic body as a part of the partition wall. It

In this restricted passage, when a high-frequency vibration that cannot be absorbed occurs, that is, when a preset set frequency is exceeded, the air chamber located opposite to the sub-liquid chamber with the diaphragm interposed therebetween. And the atmosphere are closed by a switching valve to be closed. By doing so, the rigidity of the diaphragm is increased as compared with the case where the air in the air chamber acts as an air spring and the switching valve is opened to open the air chamber and the atmosphere.

As a result, the frequency at which the liquid resonates in the restricted passage moves to the high frequency side, and the dynamic spring constant of the vibration isolator decreases in the frequency range of high frequency vibration. That is, the characteristic of the vibration isolator can be changed by the switching valve depending on whether or not the air chamber is opened to the atmosphere, and the vibration can be absorbed over a wide frequency range.

On the other hand, the sub-liquid chamber is formed by the space inside the opening formed in the liquid-chamber forming member, and the diaphragm constitutes a part of the partition wall of the sub-liquid chamber. In addition, the cover body that holds the diaphragm between the liquid chamber forming member and the diaphragm forms an air chamber in which gas is sealed, and a passage portion that forms a flow path in the switching valve that is connected to the air chamber is formed. , Is integrally formed with the cover body.

Therefore, since the passage portion of the switching valve and the cover body are integrally formed, the number of parts is reduced and the manufacturing cost of the vibration isolator is reduced. Further, it is not necessary to secure the airtightness between the switching valve and the cover body, and it is not necessary to adopt a seal structure using an O ring or the like. further,
Since the passage portion of the switching valve and the cover body are integrally formed, the connecting portion between them is eliminated, and the passage portion is not damaged by the vibration of the vehicle or the like equipped with the vibration isolator.

From the above, according to the vibration isolator of claim 1,
The manufacturing cost can be reduced while reliably connecting the passage portion of the switching valve and the cover body.

The operation of the vibration isolator according to claim 2 will be described below. According to this claim, the same operation as that of claim 1 is achieved. However, since the cover body is caulked and connected to the liquid chamber forming member and the cover body and the passage portion integrally formed with the cover body are made of resin, the following operation is performed. Play.

That is, since the cover body and the liquid chamber forming member are caulked and connected to each other, it is not necessary to screw the cover body and the liquid chamber forming member with each other, and the structure is simplified and the number of parts is reduced. And the manufacturing cost is further reduced. Further, since no screw is fixed between them, there is no risk of loosening due to vibration.

Further, since the cover body and the passage portion are made of resin, the weight of the vibration isolator can be reduced.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 5, and this embodiment will be described based on these drawings.

As shown in FIG. 1, a bottom plate 12 is provided at the bottom of the vibration isolator 10 of this embodiment. A mounting bolt 14 is projected from the lower center of the bottom plate 12, and as an example, the vibration isolator 10 is fixed to the body of an automobile (not shown) using the mounting bolt 14. The circumference of the bottom plate 12 is a tubular standing wall portion 12A bent at a right angle, and the flange portion 1 bent at a right angle is provided at the upper end of the standing wall portion 12A.
2B is continuously formed.

A lower end portion of a cylindrical outer cylinder 16 is caulked and fixed to the flange portion 12B of the bottom plate 12, and a peripheral portion of the first diaphragm 18 is provided between the flange portion 12B and the lower end portion of the outer cylinder 16. Are pinched. A space between the first diaphragm 18 and the bottom plate 12 is a first air chamber 20, and the first air chamber 20 and the outside are communicated with each other through an air hole 21 formed in the standing wall portion 12A.

The upper end of the inner peripheral surface of the outer cylinder 16 is formed as a widened portion 16B having an enlarged inner diameter.
The outer periphery of the elastic body 22 that closes the opening of the outer cylinder 16 is vulcanized and bonded. In addition, a part of the elastic body 22 is extended to the lower end portion of the inner circumference of the outer cylinder 16, and the extended elastic body 22 is provided.
The outer peripheral side of is vulcanized and bonded to the outer cylinder 16.

A support base 24 is provided at the upper center of the elastic body 22.
Are vulcanized and adhered. The support 24 is a mounting portion of an engine (not shown), and mounting bolts 26 for fixing the engine are provided upright.

A liquid chamber 28 is formed here by the inner peripheral portion of the outer cylinder 16, the lower end portion of the elastic body 22, the first diaphragm 18, and the like. The liquid chamber 28 is filled with a liquid such as ethylene glycol. ing.

A cylindrical partition member 30 made of synthetic resin or the like is arranged in the liquid chamber 28, and the liquid chamber 28 is divided into the main liquid chamber 32.
And a first sub liquid chamber 34. A concave portion 30A is formed on the first sub liquid chamber 34 side of the partition member 30.

A thin groove 44A having a rectangular cross section is formed on the outer periphery of the partition member 30 along the circumferential direction. 44A
At one end of the narrow groove 44B extending to the upper surface of the partition member 30.
And the opening 44C penetrating into the recess 30A is connected to the other end of the narrow groove 44A. Fine groove 44A, 44
The outer cylinder 16 side of B is closed by the extension of the elastic body 22 and serves as a first limiting passage 52 that connects the main liquid chamber 32 and the first sub liquid chamber 34.

Further, the partition member 30 is formed with a rectangular hole 42 from the outer periphery toward the center of the partition member 30.
As shown in FIG. 1, the tip of the rectangular hole 42 is bent upward and communicates with the main liquid chamber 32 through the opening 42A to form a second restriction passage 46.

A through hole 48 is formed on the side surface of the outer cylinder 16 at a position corresponding to the rectangular hole 42 of the partition member 30. As shown in FIGS. 1 to 3, the through hole 48 corresponds to the through hole 48. The liquid chamber forming member 50 is attached to the outer cylinder 16 by welding a flange portion 50A formed on one end side of the cylindrical liquid chamber forming member 50 to the outer peripheral surface of the outer cylinder 16. Then, the elastic body 22 between the side surface of the outer cylinder 16 and the partition member 30.
Inside the liquid chamber forming member 50 and the rectangular hole 4 of the partition member 30.
A frame-shaped communication member 49 that communicates with 2 is inserted.

Further, the other end side of the liquid chamber forming member 50 is a large diameter portion 50C having a diameter increased by one step via a step portion 50B, and an opening portion is formed on the other end side of the liquid chamber forming member 50. It is formed. The second diaphragm 68 and the second diaphragm 6 are provided on the other end side of the liquid chamber forming member 50.
The cover bodies 78 are arranged so as to face each other with the intermediate body 8 interposed therebetween. That is, the large-diameter portion 50C of the liquid chamber forming member 50 is caulked near the tip portion, and the cover body 78 and the liquid chamber forming member 50 are connected while sandwiching the second diaphragm 68.

Further, a concave portion 78A is formed in a central portion of the cover body 78 facing the second diaphragm 68, and a through hole 78B is formed at the center of the concave portion 78A. Further, an annular recess 76 formed in an annular shape is arranged in the portion of the cover body 78 outside the recess 78A, and the annular recess 76 and the step portion 50B of the liquid chamber forming member 50 are arranged.
The peripheral portion of the second diaphragm 68 is sandwiched between and.

In the free state, the second diaphragm 68 projects in a substantially hemispherical shape toward the rectangular hole 42 side. Therefore, the opening of the liquid chamber forming member 50 has the second diaphragm 6
The second auxiliary liquid chamber 70 is constituted by the space inside the opening that is closed by 8. In addition, the recess 78A of the cover body 78
Is a second air chamber 74 which is closed by the second diaphragm 68 and air is enclosed.

As shown in FIGS. 1 to 4, the cover body 78
A switching valve 82, which is an electromagnetic valve, is arranged at a position opposite to the liquid chamber forming member 50. At the center of the switching valve 82, a body 90, which is a passage formed of a resin material in a tubular shape and around which the coil 84 is wound, is located. The body 90 is connected to the body 90 from the upper side to the right side in the drawing. Tube 90
A is connected to the cover body 78, and the through hole 7 of the cover body 78
8A and the passage in the connecting pipe 90A communicate with each other. That is, the body 90 and the cover body 78 are integrally formed of a resin material.

A supply / discharge pipe 90 is provided above the switching valve 82.
B is formed so as to project upward, and the connecting pipe 90
The passage in A and the passage in the supply / discharge pipe 90B are connected to each other to form a bent fluid passage 94.

Further, the coil case 102 forming the outer wall of the switching valve 82 accommodates a coil 84, which is a winding wire, and is connected to the coil 84 on the lower side of the coil case 102 to energize the coil 84. Is provided.

On the other hand, in the body 90, a plunger 86, which is a cylindrical valve body made of a ferromagnetic steel material, is arranged so as to be movable in the vertical direction in the figure, and the base of the plunger 86 is arranged. A yoke iron core 96 is installed to face the end side, and the plunger 86 and the yoke iron core 9 are installed.
A spring 92 is arranged between the first and second springs 6.

A packing 88 made of an elastic material such as rubber is attached to the tip of the plunger 86 by an adhesive so that when the plunger 86 enters the fluid passage 94, The packing 88 abuts on a receiving seat 90C formed in the body 90 in a cylindrical shape and serving as an inner wall surface of the fluid flow path 94. Therefore, the fluid passage 94 that penetrates the cover body 78, the connecting pipe 90A, and the supply / discharge pipe 90B to communicate the second air chamber 74 with the atmosphere can be blocked by the plunger 86 and the packing 88.

Further, as shown in FIG. 4, a coil cover 104 formed in a U shape so as to cover the lower side of the coil 84 is arranged on the outer peripheral portion of the switching valve 82. Further, as shown in FIGS. 2 and 3, a disk-shaped yoke plate 106 having a hole in the center is embedded at a position near the upper side of the body 90, and the yoke plate 106 protruding from the body 90 The outer peripheral portion 106A is connected to the upper end portion of the coil cover 104 by welding or the like.

The yoke iron core 96, the yoke plate 106, the coil cover 104 and the like are each made of a ferromagnetic steel material, and therefore the coil 8 is used.
A yoke body that forms a magnetic path M that surrounds the coil 84 when electricity is supplied to the coil 4 is configured by the yoke iron core 96, the yoke plate 106, the coil cover 104, and the like.

From the above, the plunger 86 determines the magnetic path M
The electromagnetic force generated by the formation of the magnetic field moves downward against the biasing force of the spring 92, and the magnetic force M causes the spring 92 to move upward due to the disappearance of the magnetic path M. Therefore, with the formation of the magnetic path M and the disappearance of the magnetic path M,
The fluid passage 94 is opened and closed by the plunger 86 entering and leaving the fluid passage 94.

That is, when no voltage is applied to the coil 84, as shown in FIG. 2, the plunger 86 is urged by the spring 92, so that the packing 88 abuts on the receiving seat 90C and the fluid flow. Block the passage 94. On the other hand, when a predetermined voltage is applied to the coil 84, the plunger 86 is attracted to the yoke iron core 96 side by the electromagnetic force generated by the coil 84, as shown in FIG.
The packing 88 at the tip of the seal escapes to open the fluid flow path 94, and air flows as indicated by arrow A.

Further, the coil 84 is connected to the control circuit 60 for turning on / off the applied voltage. The control circuit 60 is driven by the vehicle power supply and at least the vehicle speed sensor 62.
And a detection signal from the engine speed sensor 64,
Vehicle speed and engine speed can be detected. This allows the control circuit 60 to determine whether the vehicle is idling or shaking.

On the other hand, the supply / discharge pipe 90B of the switching valve 82 is formed in a cylindrical shape and has a fluid passage 11 through which air passes.
4, the filter unit 110 has a packing 116.
Are fitted through. In addition, the filter unit 11
No. 0 has a built-in filter 112 made of non-woven fabric, and the filter 112 is arranged so as to face the opening at the upper end of the supply / discharge pipe 90B.

Therefore, the air flows through the filter unit 110 as indicated by the arrow B, and together with the flow inside the switching valve 82 indicated by the arrow A, the atmosphere side outside the vibration isolator 10 and the second air chamber. Air will come and go between the inside of 74.

The passage length of the first limiting passage 52 is longer than the passage length of the second limiting passage 46, and the passage cross-sectional area of the first limiting passage 52 is larger than the passage length of the second limiting passage 46. It is smaller than the passage cross-sectional area. Further, the rigidity of the first diaphragm 18 and the rigidity of the second diaphragm 68 are different from each other.

Here, the liquid column resonance frequency in the limiting passage is determined by the size of the limiting passage and the rigidity of the diaphragm, and the liquid column resonance frequency in the second limiting passage 46 is set to the second diaphragm 68. It can be changed by changing the value of rigidity.

Next, the operation of the embodiment will be described. The second sub liquid chamber 70 is formed by a space on the right side of the opening formed inside the large diameter portion 50C of the liquid chamber forming member 50 in the figure,
The second diaphragm 68 constitutes a part of the partition wall of the second auxiliary liquid chamber 70. Further, the cover body 78 that holds the second diaphragm 68 between the liquid chamber forming member 50 and the liquid chamber forming member 50 forms a second air chamber 74 in which air is enclosed between the second diaphragm 68 and the second diaphragm 68. Fluid passage 9 in the switching valve 82 connected to
A body 90 that forms part 4 is integrally formed with the cover body 78.

Therefore, since the body 90 of the switching valve 82 and the cover body 78 are integrally formed, the number of parts is reduced and the manufacturing cost of the vibration isolator 10 is reduced. Further, it is not necessary to secure the airtightness between the switching valve 82 and the cover body 78, and it is not necessary to adopt a seal structure using an O ring or the like. Further, since the body 90 of the switching valve 82 and the cover body 78 are integrally formed, the connecting portion between them is lost, and the body 90 is damaged by the vibration of the vehicle or the like in which the vibration isolator 10 is mounted. Disappears.

As described above, according to the vibration isolator 10 of the present embodiment, the manufacturing cost can be reduced while reliably connecting the body 90 of the switching valve 82 and the cover body 78.

On the other hand, according to the present embodiment, the cover body 7
8 is caulked and connected to the liquid chamber forming member 50, and a cover body 78 and a body 90 integrally formed with the cover body 78 are made of resin.

Therefore, the cover body 78 and the liquid chamber forming member 50.
Since the edges are caulked and connected, there is no need to screw the cover body 78 and the liquid chamber forming member 50 with each other, the structure is simplified, the number of parts is reduced, and the manufacturing cost is further reduced. It Further, since no screw is fixed between them, there is no risk of loosening due to vibration.

Further, since the cover body 78 and the body 90 are made of resin, the weight of the vibration isolator 10 can be reduced.

On the other hand, the operation of the vibration isolator 10 according to this embodiment when vibration occurs will be described below.

When the bottom plate 12 of the vibration isolator 10 is fixed to the vehicle body of a vehicle such as an automobile and the engine is mounted on the support base 24 and fixed, the vibration of the engine is transmitted to the elastic body 22 via the support base 24. The vibration is transmitted and is absorbed by the resistance based on the internal friction of the elastic body 22.

Shaking vibration (for example, frequency less than 15 Hz) may occur when the vehicle travels at 70-80 km / h, for example. At this time, the liquid is the first restriction passage 52.
The liquid flows back and forth between the main liquid chamber 32 and the first sub-liquid chamber 34, and a damping force is generated by the resistance when the liquid passes through the first restriction passage 52, and the shake vibration is effectively absorbed. It In the shake vibration, the highly rigid second diaphragm 68 is hardly deformed, and almost no liquid flows in the second restriction passage 46.

When the engine is idling or the vehicle speed is 5 km / h or less, idle vibration (for example, a frequency of 20 to 50 Hz) occurs.

At the time of this idle vibration, the first limiting passage 52 is clogged. The control circuit 60 determines from the vehicle speed sensor 62 and the engine speed sensor 64 that idle vibration is occurring, and applies a voltage to the coil 84 of the switching valve 82 to attract the plunger 86. by this,
The second air chamber 74 is opened to the atmosphere, and the dynamic spring constant of the vibration isolator 10 in the vibration frequency range of the idle vibration is reduced to reliably absorb the idle vibration.

Further, when the vehicle speed is 100 km / h or more and the engine speed is 3000 rpm or more, high-frequency vibration (for example, a frequency of about 80 Hz) that causes muffled noise is generated. Also in this case, the control circuit 60 determines from the information sent from the vehicle speed sensor 62 and the engine speed sensor 64 that the engine is in high frequency vibration, and the control circuit 60 stops applying the voltage to the coil 84. As a result, the tip of the plunger 86 closes the fluid flow path 94, and the switching valve 82 enters a closed state that closes between the second air chamber 74 and the atmosphere.

As a result, the air in the second air chamber 74 serves as an air spring, so that the rigidity of the second diaphragm 68 is increased, and the second restricting passage 46 is thereby increased.
The liquid column resonance frequency in (1) moves to the high frequency side, the dynamic spring constant in the frequency range of vibration at the time of high engine rotation decreases, and the vibration is reliably absorbed.

More specifically, since the characteristic of the vibration isolator 10 changes from the solid line state shown in FIG. 5 to the dotted line state, the dynamic spring constant K decreases even if a high rotation of 3000 rpm or more occurs in the engine. Then, vibration of the liquid in the anti-resonance region does not occur.

That is, when the switching valve 82 is opened,
The dynamic spring constant of the vibration isolator 10 decreases in the frequency range of normal idle vibration. Further, when the switching valve 82 is closed, the dynamic spring constant of the vibration isolator 10 decreases in the frequency range of high-frequency vibration that causes a muffled noise having a higher frequency than the idle vibration.

In the above embodiment, the vibration isolator 10 is used as an engine mount, but the present invention is not limited to this, and the vibration isolator 10 is used for supporting a cab mount, a body mount, and a general industrial machine. Of course, it may be used for the above.

[0063]

As described above, the vibration damping device of the present invention has an effect that it is possible to reduce the manufacturing cost while surely connecting the members.

[Brief description of the drawings]

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

FIG. 2 is an enlarged cross-sectional view of a switching valve, a second diaphragm, a liquid chamber forming member and a cover body used in the vibration isolator according to the embodiment of the present invention, showing a closed state of the switching valve.

FIG. 3 is an enlarged cross-sectional view of the switching valve, the second diaphragm, the liquid chamber forming member, and the cover body adopted in the vibration isolator according to the embodiment of the present invention, showing an open state of the switching valve.

FIG. 4 is a partial front cross-sectional view of a switching valve used in the vibration control device according to the embodiment of the present invention.

FIG. 5 is a diagram showing a graph showing characteristics of the image stabilization device according to the embodiment of the present invention.

FIG. 6 is an exploded perspective view around a switching valve used in a conventional vibration isolator.

[Explanation of symbols]

 10 Vibration Isolator 12 Bottom Plate (First Mounting Member) 22 Elastic Body 24 Supporting Base (Second Mounting Member) 32 Main Liquid Chamber 46 Second Limiting Passage 50 Liquid Chamber Forming Member 68 Second Diaphragm 70 Second Sub Liquid Chamber 74 Second air chamber 78 Cover body 82 Switching valve 90 Body

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Kojima 2-22 Serigaya, Konan-ku, Yokohama-shi, Kanagawa

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 that is provided between the member and the second mounting member and that deforms when vibration occurs; a main liquid chamber that is expandable and contractible using the elastic body as a part of a partition wall; The formed liquid chamber forming member, a sub liquid chamber formed by the space in the opening and communicating with the main liquid chamber via a restriction passage, and the sub liquid chamber arranged to face the opening. A deformable diaphragm forming a part of a partition wall of the partition, a cover body that sandwiches the diaphragm between the liquid chamber forming member and an air chamber in which gas is sealed between the diaphragm and the liquid chamber forming member, An open state in which the air chamber communicates with the atmosphere and the air chamber A switching valve that can be in a closed state that closes the atmosphere, and a passage portion that forms a flow path in the switching valve that is connected to the air chamber and that is integrally formed with the cover body. Anti-vibration device characterized by. 2. 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 that is provided between the member and the second mounting member and that deforms when vibration occurs; a main liquid chamber that is expandable and contractible using the elastic body as a part of a partition wall; The formed liquid chamber forming member, a sub liquid chamber formed by the space in the opening and communicating with the main liquid chamber via a restriction passage, and the sub liquid chamber arranged to face the opening. A deformable diaphragm forming a part of a partition wall of the partition, and the liquid chamber forming member being clamped and connected to the liquid chamber forming member, and sandwiching the diaphragm between the liquid chamber forming member and the diaphragm. Resin cover that forms an air chamber in which gas is enclosed A switching valve that can be in an open state in which the air chamber communicates with the atmosphere and a closed state in which the air chamber and the atmosphere are closed, and a flow path in the switching valve that connects to the air chamber is formed, and An anti-vibration device comprising: a resin-made passage portion integrally formed with the cover body.