WO2017033696A1

WO2017033696A1 - Vibration-proofing device

Info

Publication number: WO2017033696A1
Application number: PCT/JP2016/072862
Authority: WO
Inventors: 小島　宏
Original assignee: 株式会社ブリヂストン
Priority date: 2015-08-21
Filing date: 2016-08-03
Publication date: 2017-03-02

Abstract

This vibration-proofing device comprises: a cylindrical body connected to a vibration receptor; a supporting body connected to a vibration generator; an elastic body by which the supporting body is mounted so as to be relatively movable to the cylindrical body; a first liquid chamber which is defined by an orifice passage and the elastic body; a second liquid chamber which communicates with the first liquid chamber through the orifice passage and circulates liquid therebetween; a first gas chamber with a diaphragm as a wall portion; a second gas chamber which is capable of communicating with the first gas chamber; and a switching portion which switches the communication state between the first gas chamber and the second gas chamber.

Description

Vibration isolator

This disclosure relates to a vibration isolator that suppresses vibration.

Conventionally, an anti-vibration device that suppresses vibration generated in an engine has been used for a vehicle (see, for example, Japanese Patent Laid-Open No. 8-074923).

This vibration isolator includes a support that supports the engine, a cylinder that is connected to the vehicle body, and an elastic body that connects the support and the cylinder. A liquid chamber is formed in the cylinder. The liquid chamber is partitioned by the second partition wall, and is a main liquid chamber and a sub liquid chamber in order from the support side.

The main liquid chamber and the sub liquid chamber communicate with each other through a restriction passage formed in the second partition wall, and a part of the wall surface of the sub liquid chamber is constituted by a diaphragm. An air chamber is provided next to the auxiliary liquid chamber with the diaphragm as a boundary. This air chamber is configured to be able to communicate with the outside via a switching valve, and is configured to be able to be switched between an atmospheric open state that communicates with the outside and a non-open state that is blocked from the outside.

As a result, when the elastic body is deformed by vibration from the engine, the diaphragm constituting the wall surface of the sub liquid chamber is deformed, so that the liquid flows between the main liquid chamber and the sub liquid chamber via the restriction passage. Is configured to do. Moreover, it is comprised so that the static spring characteristic of a vibration isolator can be changed by switching the air release state of an air chamber with a switching valve.

However, conventionally, since the switching valve is configured to communicate with the outside of the vibration isolator, it has been necessary to provide a filter at a communication portion with the outside so that foreign matter and moisture do not enter the switching valve.

An object of one embodiment of the present invention is to provide an anti-vibration device in which foreign matter and moisture hardly enter the switching unit.

The first aspect is a cylinder connected to one of the vibration generating part and the vibration receiving part, a support connected to the other of the vibration generating part and the vibration receiving part, and relative movement of the support to the cylinder. An elastic body that can be attached, a passage member formed in the cylindrical body, and a first liquid chamber in which liquid is stored, a diaphragm that partitions the cylindrical body, and the passage member. A second liquid chamber provided between the first liquid chamber through a passage formed by the passage member, and provided on the opposite side of the second liquid chamber through the diaphragm. A first gas chamber, a second gas chamber isolated from the first gas chamber, and a switching unit that switches the first gas chamber and the second gas chamber to a communication state or a non-communication state.

That is, the switching unit is configured to communicate the first gas chamber with the second gas chamber. For this reason, unlike the structure in which the first gas chamber is directly communicated to the outside, the entry of foreign matter or moisture from the outside is suppressed without providing a filter or the like at the communication portion of the switching unit to the outside.

In the second aspect, the second gas chamber communicates only with the first gas chamber.

That is, the second gas chamber communicated with the first gas chamber is configured to communicate only with the first gas chamber, and the first gas chamber is in a state where the first gas chamber and the second gas chamber communicate with each other. And the sealed state of the second gas chamber can be maintained.

For this reason, compared with the case where the 2nd gas chamber is open | released by air | atmosphere by a small hole, the penetration | invasion of the foreign material from the exterior to the switching part and a water | moisture content can be suppressed.

In the third aspect, the volume of the second gas chamber is set larger than the volume of the first gas chamber.

That is, the volume of the second gas chamber is set to be larger than that of the first gas chamber, and the volume change between when the gas chambers are in a non-communication state and when they are in a communication state can be increased.

Thus, even in a limited space, the change in the static spring characteristics of the vibration isolator can be increased by increasing the difference in volume occupied by each gas chamber.

According to a fourth aspect, the cylindrical body connected to one of the vibration generating part and the vibration receiving part, the support connected to the other of the vibration generating part and the vibration receiving part, and the relative movement of the support to the cylindrical body An elastic body to be attached, a first liquid chamber that is provided between the first membrane and the elastic body for partitioning the cylindrical body, and stores a liquid; and a first partition wall of a passage member that partitions the cylindrical body; The first gas chamber provided between the first membrane, the second membrane partitioning the cylindrical body, and the first partition wall are provided between the first membrane through the passage formed by the passage member. A deformation space that is provided between a second liquid chamber in which a liquid circulates between one liquid chamber, a second partition wall that partitions the cylindrical body, and the second membrane, and forms a deformation region of the second membrane. A second gas chamber isolated from the first gas chamber, and the first gas chamber Having a switching unit for switching the second gas chamber to the communicating state or a non-communicating state.

According to a fifth aspect, the first gas chamber communicates with the second gas chamber via the deformation space, and the switching unit includes the first gas chamber and the second gas chamber via the deformation space. Switch communication status with.

This makes it possible to effectively use the deformation space of the second membrane.

In the sixth aspect, the volume of the second gas chamber is larger than the volume of the deformation space, and the volume of the deformation space is larger than the volume of the first gas chamber.

This makes it possible to increase the change in the static spring characteristics of the vibration isolator by increasing the volume difference even in a limited space.

Also, the volume of the first gas chamber is smaller than the volume of the deformation space or the second air chamber. For this reason, a deformation | transformation of the 1st membrane in a non-communication state can be suppressed.

Since this aspect is configured as described above, the vibration isolator is such that foreign matter and moisture hardly enter the switching unit.

It is a longitudinal cross-sectional view which shows the vibration isolator which concerns on 1st Embodiment. FIG. 2 is a cross-sectional view of the vibration isolator according to the first embodiment taken along arrow 2-2 in FIG. It is a longitudinal cross-sectional view which shows the vibration isolator which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view which shows the vibration isolator which concerns on 3rd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a vibration isolator 10 according to the present embodiment. The vibration isolator 10 is attached to a vehicle and suppresses engine vibration.

The vibration isolator 10 includes a cylindrical body 12 connected to a vehicle body as an example of a vibration receiving unit. In the cylindrical body 12, the opening edge of the opening at the end on one side A is curved outward in the radial direction, and the curved portion 12A is formed over the entire circumference.

A rubber elastic body 14 is fixed to the curved portion 12 A of the cylindrical body 12, and the opening of one side A of the cylindrical body 12 is closed by the elastic body 14.

The elastic body 14 includes a main body portion 14A formed in a columnar shape, and a flange portion 14B extending laterally is integrally formed at one end portion of the main body portion 14A over the entire circumference. A leg portion 12C extending toward the curved portion 12A of the cylindrical body 12 is integrally formed with the main body portion 14A, and the end surface of the leg portion 12C is vulcanized on the inner peripheral surface of the curved portion 12A of the cylindrical body 12. It is glued.

The leg portion 12C is inclined toward the outer peripheral direction toward the cylindrical body 12 side, and the elastic body 14 is formed in a mountain shape that becomes higher toward the central portion. The inner side surface 12D of the leg portion 12C is inclined so as to become higher toward the center portion, and a mortar-like space is formed inside the elastic body 14.

A metal support 16 is provided on the main body 14A of the elastic body 14. The support body 16 includes an embedded portion 16A embedded in the main body portion 14A and an extending portion 16B extending from the embedded portion 16A, and the extending portion 16B extends from the end surface of the main body portion 14A. It is configured as follows. The embedded portion 16A includes a disk-shaped anchor portion 16C and a triangular pyramid-shaped protruding portion 16D protruding from the anchor portion 16C toward the cylindrical body 12, and the anchor portion 16C suppresses the removal.

The extension portion 16B includes a cylindrical large-diameter portion 16E extending from the anchor portion 16C and a screw portion 16F extending from the large-diameter portion 16E. The screw portion 16F is an example of a vibration generating portion. It is comprised so that it may support. Thereby, when vibration is input from the engine, the elastic body 14 is elastically deformed so that the support body 16 can move relative to the cylindrical body 12.

A partition member 18 is provided inside the cylindrical body 12, and a first liquid chamber 20 filled with a liquid such as ethylene glycol is formed between the partition member 18 and the elastic body 14. . A second liquid chamber 22 is formed on the side opposite to the first liquid chamber 20.

The partition member 18 includes a disk portion 24 formed of a circular plate material and a support plate 26 that supports the disk portion 24. The support plate 26 is fixed in a state where the upper surface of the circular top surface 26 A constituting the central portion is in contact with the disk portion 24, and the lower surface of the top surface 26 A faces the second liquid chamber 22. The outer peripheral portion of the top surface 26A is bent toward the other side B, and a small-diameter cylindrical wall 26B is formed. An end portion of the small diameter cylindrical wall 26B is bent outward, and a step portion 26C is formed. The outer peripheral portion of the stepped portion 26C is bent toward the other side B, and a large-diameter cylindrical wall 26D is formed. The end of the large-diameter cylindrical wall 26D is bent outward, and a fixing flange 26E is formed over the entire circumference.

A circular ring-shaped passage forming member 28 is disposed in the stepped portion 26 C, and the passage forming member 28 is sandwiched between the stepped portion 26 C and the disc portion 24 of the support plate 26. Is held in. A spiral groove is formed on the outer peripheral surface of the passage forming member 28, and an orifice passage 30 is formed between the groove and the cylindrical body 12. One end of the orifice passage 30 communicates with the first liquid chamber 20 via a hole (not shown) provided in the disc portion 24, and the other end is connected to the second liquid via a hole (not shown) provided in the step portion 26C. It is configured to communicate with the liquid chamber 22.

The first liquid chamber 20 and the second liquid chamber 22 communicate with each other through the orifice passage 30, and the orifice passage 30 circulates the liquid between the first liquid chamber 20 and the second liquid chamber 22, and It is configured to limit the amount of circulation.

An internal fitting member 32 is fixed to the large-diameter cylindrical wall 26D of the support plate 26. The inner fitting member 32 is configured by an inner fitting cylindrical portion 32A fitted inside the large-diameter cylindrical wall 26D and a flange 32B bent outward from the end portion of the inner fitting cylindrical portion 32A. A bent portion 32C that is bent toward the other side B is formed on the entire periphery of the peripheral edge portion of the flange 32B.

A rubber diaphragm 34 is vulcanized and bonded to the inner side of the internal fitting cylindrical portion 32A, and the second liquid chamber 22 partitioned between the diaphragm 34 and the top surface 26A side of the support plate 26 is provided. It has become.

A bottom component member 36 is provided on the other side B of the diaphragm 34, and a wall surface 36 D that closes the opening on the other side B of the cylinder 12 is formed by the bottom component member 36. The space is sealed.

The bottom component member 36 includes a columnar portion 36A and a fixing portion 36B extending outward from the circumferential surface of the columnar portion 36A. The fixing portion 36B is in a state of being in contact with the flange 32B of the internal fitting member 32. It is surrounded by the bent portion 32C. The fixing portion 36B of the bottom component member 36, the flange 32B of the internal fitting member 32, and the fixing flange 26E of the support plate 26 are fixed by a crimping portion 38 in which the end edge of the cylindrical body 12 is crimped.

The upper end surface of the bottom component member 36 constitutes a partition wall 36C that partitions the internal space of the cylinder 12. Thereby, between the partition wall 36 C and the diaphragm 34, the first gas chamber 40 that is disposed on the opposite side of the second liquid chamber 22 with the diaphragm 34 as a wall portion and filled with air is formed. .

A columnar first communication passage 42 communicating with the first gas chamber 40 is opened in the partition wall 36 C formed by the bottom component member 36, and the first communication passage 42 is incorporated in the bottom component member 36. The first port 44A of the switching unit 44 is connected. The second port 44B of the switching unit 44 on the side opposite to the first port 44A communicates with the second gas chamber 46 formed in the bottom component member 36.

As shown in FIG. 2, the second gas chamber 46 is configured by a large cavity provided inside the thin part 36 E that constitutes the outer peripheral wall of the bottom component member 36. A projecting portion 36F projecting inward from a part is formed, and a switching unit 44 is provided in the projecting portion 36F. The second gas chamber 46 is formed in a substantially fan shape so as to avoid the overhanging portion 36F provided with the switching portion 44, and the region excluding the overhanging portion 36F is effective in the bottom component member 36. It's being used. Thereby, about 1/3 in the bottom component member 36 constitutes the overhang portion 36 F, and about 2/3 in the bottom component member 36 constitutes the second gas chamber 46.

The second gas chamber 46 is provided with a frame wall 36G extending outward from the fan-shaped center, and the frame wall 36G is arranged at a position that bisects the second gas chamber 46. . The frame wall 36G is configured to support the top surface of the second gas chamber 46 on the bottom surface and maintain a separation distance between the top surface and the bottom surface, and the structure of the second gas chamber 46 is strengthened.

A gap is provided between the distal end of the skeleton wall 36G and the thin portion 36E, and the one side region where the second port 44B of the switching portion 44 is provided and the other side of the skeleton wall 36G as a boundary. A passage 36H that communicates with the region is formed. Accordingly, the volume of the entire second gas chamber 46 is secured while strengthening the structure of the second gas chamber 46, and the path from one side of the second gas chamber 46 to the other side is bent. It is configured.

The height of the second gas chamber 46 is set to be larger than that of the first gas chamber 40. Thereby, the volume of the second gas chamber 46 is made larger than the volume of the first gas chamber 40.

In the present embodiment, the case where the volume of the second gas chamber 46 is larger than the volume of the first gas chamber 40 will be described. However, the present invention is not limited to this, and the volume of the second gas chamber 46 and the first gas are not limited thereto. Even if the volume of the chamber 40 is the same, the volume of the second gas chamber 46 may be smaller than the volume of the first gas chamber 40.

As shown in FIG. 1, the second gas chamber 46 is provided at a position away from the diaphragm 34 by a partition wall 36 C formed by the bottom component member 36. It is configured not to. As a result, even if the internal pressure of the second liquid chamber 22 changes and the diaphragm 34 is displaced, the second gas chamber 46 is connected to the second liquid chamber 22 as long as it is not in communication with the first gas chamber 40. It is configured not to affect the internal pressure change.

In this embodiment, the switching unit 44 is composed of a solenoid valve, and the solenoid valve is configured such that only a terminal to which a control harness is connected extends to the outside (not shown). Thereby, the solenoid valve which comprises the switching part 44 is kept airtight and watertight, and water and a foreign material do not penetrate | invade from the outside.

The solenoid valve constituting the switching unit 44 is configured to control the air flow between the first port 44A and the second port 44B. Specifically, when the solenoid valve is operated, the communication between the first gas chamber 40 and the second gas chamber 46 is formed by allowing air to flow between the first port 44A and the second port 44B. Has been. Further, when the solenoid valve is not operated, the air flow between the first port 44A and the second port 44B is cut off so that a non-communication state in which the first gas chamber 40 and the second gas chamber 46 do not communicate can be formed. It is configured.

Accordingly, the switching unit 44 is configured to communicate the first port 44A and the second port 44B. The switching unit 44 includes a first port 44A communicated via the first communication path 42. The first gas chamber 40 and the second gas chamber 46 connected to the second port 44B can communicate with each other.

The switching unit 44 is provided with a housing space (not shown) that houses a solenoid, a plunger, a valve body, and the like that constitute a mechanism portion of the electromagnetic valve, and the first gas chamber 40 is located upstream. The switching unit 44 is configured such that the second gas chamber 46 is connected to the downstream side of the accommodation space, and the first gas chamber 40 upstream of the accommodation space can communicate with the second gas chamber 46 on the downstream side. Has been.

The second gas chamber 46 is configured to communicate only with the first gas chamber 40, and is sealed so as not to communicate with other than the first gas chamber 40.

The operation of the present embodiment according to the above configuration will be described. When the support 16 and the cylinder 12 are moved relative to each other due to vibration from the engine, the elastic body 14 is deformed and the fluid pressure in the first fluid chamber 20 changes. Then, the liquid moves between the first liquid chamber 20 and the second liquid chamber 22 via the orifice passage 30, and the liquid pressure in the second liquid chamber 22 changes, and the diaphragm 34 corresponds to the change in the liquid pressure. Is displaced.

At this time, the displacement amount of the diaphragm 34 varies according to the spring force of the air spring in the first gas chamber 40.

For this reason, by changing from the non-communication state in which the first gas chamber 40 and the second gas chamber 46 do not communicate with each other in the switching unit 44 to the communication state in which the first gas chamber 40 and the second gas chamber 46 communicate with each other, The static spring characteristic of the vibration isolator 10 can be changed from a high spring characteristic to a low spring characteristic.

At this time, the communication part of the switching unit 44 is the second gas chamber 46. For this reason, unlike the case where the first gas chamber 40 is directly communicated to the outside, it is possible to suppress the entry of foreign matter and moisture from the outside without providing a filter or the like in the communication portion of the switching unit 44 to the outside. . Thereby, generation | occurrence | production of the rust resulting from moisture penetration | invasion and a short circuit can be suppressed.

Further, the switching unit 44 is built in the bottom component member 36 while maintaining airtightness and watertightness. For this reason, compared with the case where the switching unit 44 is provided outside the vibration isolator 10, the direct entry of foreign matter and moisture into the switching unit 44 can be suppressed. Thereby, the effect mentioned above can be heightened.

Further, the second gas chamber 46 is sealed so as not to communicate with other than the first gas chamber 40, and the sealed state is maintained even when the first gas chamber 40 and the second gas chamber 46 are communicated. Can do. For this reason, compared with the case where the 1st gas chamber 40 is connected outside, the penetration | invasion of the foreign material and the water | moisture content from the exterior to the switch part 44 can be suppressed, without providing a filter etc. in a communication part.

Further, in comparison with the case where a small hole is provided in the second gas chamber 46 and opened to the atmosphere, entry of foreign matter and moisture from the outside can be suppressed.

Therefore, the vibration isolator 10 in which foreign matter and moisture hardly enter the switching unit 44 is obtained.

And the volume of the 2nd gas chamber 46 is set larger than the volume of the 1st gas chamber 40, and the case where the 1st gas chamber 40 and the 2nd gas chamber 46 are made into a non-communication state, and the case where it is made into a communication state The volume change at can be increased.

Thereby, even in a limited space in the apparatus, the change in the static spring characteristics of the vibration isolator 10 is increased by increasing the difference in volume occupied by the first gas chamber 40 and the second gas chamber 46. be able to.

In the present embodiment, the case where the second gas chamber 46 communicates only with the first gas chamber 40 has been described as an example, but the present invention is not limited to this. For example, a small hole through which the second gas chamber 46 communicates with the outside may be formed through the bottom surface of the cylindrical portion 36A. The small holes may be any ones that can avoid the intrusion of solid foreign matters, and can prevent clogging. Thereby, by making the switching part 44 into a communication state, the 1st gas chamber 40 can be approximated to an air release state, and also the change of the static spring characteristic of the vibration isolator 10 can be enlarged.

In this case, it is possible to suppress entry of foreign matter and moisture into the switching unit 44 by providing a small hole at a site away from the second port 44B. At this time, in the present embodiment, a frame wall 36G is provided in the second gas chamber 46, and the path from one side of the second gas chamber 46 to the other side is bent. For this reason, the intrusion prevention effect of a foreign material or moisture can be enhanced. Further, if a filter is provided in the small hole, entry of foreign matter and moisture can be suppressed.

In the present embodiment, the case where the wall surface of the second gas chamber 46 is configured by the bottom component member 36 has been described, but the present invention is not limited to this. For example, if a part of the wall surface of the second gas chamber 46 is configured with a diaphragm facing outward, the first gas chamber 40 can be brought closer to the atmosphere open state when the switching unit 44 is in a communication state. Further, if the communication state with the first gas chamber 40 can be realized, the second gas chamber 46 may be provided separately from the vibration isolator 10.

(Second Embodiment)
FIG. 3 is a diagram showing the vibration isolator 100 according to the second embodiment. The same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and only different parts are described.

That is, a partition plate 102 is provided in the cylinder 12 on the elastic body 14 side, and a central hole 104 is formed in the center of the partition plate 102. The central hole 104 is a circular plate-shaped rubber first membrane 106, and the periphery of the first membrane 106 is vulcanized and bonded to the opening edge of the central hole 104. Thereby, the inside of the cylinder 12 is partitioned by the first membrane 106.

The cylinder 12 is provided with a passage forming member 28 that is an example of a passage member that is in surface contact with the partition plate 102. A portion corresponding to the first membrane 106 is recessed in one surface 28A of the passage forming member 28, and a first gas chamber is provided between the first partition wall 28B and the first membrane 106 forming the bottom surface thereof. 108 is formed.

A recess 28D is formed in the other surface 28C of the passage forming member 28. A circular rubber plate-like second membrane 112 supported by the ring member 110 is disposed on the back side, which is the elastic body 14 side, of the recess 28D. It is partitioned by. A portion corresponding to the second membrane 112 is set back on the wall surface on the back side from the fixing position of the second membrane 112, and a second liquid chamber is provided between the second membrane 112 and the first partition wall 28B. 114 is formed. The second liquid chamber 114 communicates with the first liquid chamber 20 via an orifice passage 30 that is an example of a passage formed in the passage forming member 28, and the first liquid chamber 20, the second liquid chamber 114, The liquid is circulated between the two.

The orifice passage 30 includes a passage opening 30A formed in the partition plate 102, a groove 30B formed in a spiral shape along the peripheral surface of the passage forming member 28, and the groove 30B in the second liquid chamber 114. It is comprised by the communicating hole (illustration omitted) connected to.

In the recess 28D of the passage forming member 28, a thick portion 36J formed at the center of the bottom component member 36 is fitted. A portion corresponding to the second membrane 112 is recessed in the end face of the thick portion 36J. A deformation space 116 that forms a deformation region of the second membrane 112 is formed between the second partition wall 36 I that forms the bottom of the recessed portion and the second membrane 112.

The bottom component member 36 is provided with the second gas chamber 46 and the switching unit 44 described above, and the first port 44A of the switching unit 44 is connected to the bottom component member 36 and the passage forming member 28. It communicates with the first gas chamber 108 via 118.

The volume of the second gas chamber 46 may be set larger than the volume of the deformation space 116, and the volume of the deformation space 116 may be set larger than the volume of the first gas chamber 108.

Even in the present embodiment related to the above configuration, the same effects as those of the first embodiment can be achieved.

Further, when a pressure change occurs in the first liquid chamber 20 during vibration input, the first membrane 106 is elastically deformed toward the first gas chamber 108, so that the vibration absorbing power can be increased. At this time, the dynamic spring characteristics of the first liquid chamber 20 can be changed by switching the communication state between the first gas chamber 108 and the second gas chamber 46 by the switching unit 44.

Thereby, the volume difference between the communication state in which the first gas chamber 108 and the second gas chamber 46 are communicated and the non-communication state can be increased. Therefore, the change of the static spring characteristic and the dynamic spring characteristic of the vibration isolator 100 can be increased.

Further, the volume of the first gas chamber 108 is smaller than the volumes of the deformation space 116 and the second gas chamber 46. For this reason, the deformation | transformation of the 1st membrane 106 in a non-communication state can be suppressed.

(Third embodiment)
FIG. 4 is a diagram illustrating a vibration isolator 130 according to the third embodiment. The same or equivalent parts as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted, and only different parts are described. To do.

That is, the vibration isolator 130 according to the present embodiment is different from the second embodiment in that the first gas chamber 108 is communicated with the second gas chamber 46 through the deformation space 116. More specifically, the passage forming member 28 is formed with a first communication passage 132 that allows the first gas chamber 108 and the deformation space 116 to communicate with each other. In addition, the bottom component member 36 is formed with a second communication path 134 that connects the deformation space 116 and the second gas chamber 46 via the switching unit 44. Thereby, the switching unit 44 is configured to be able to switch the communication state between the first gas chamber 108 and the second gas chamber 46 via the deformation space 116.

In such a configuration, the deformation space 116 of the second membrane 112 provided between the first gas chamber 108 and the second gas chamber 46 is communicated with the first gas chamber 108 and the second gas chamber 46. It can be used effectively as a passage.
Even when the switching unit 44 is in a non-communication state, the first gas chamber 108 and the deformation space 116 are in communication with each other, and the first gas chamber 108 and the deformation space 116 are compared with the case of the first gas chamber 108 alone. And the combined volume increases. Thereby, a static spring and a dynamic spring can be made soft.

The operational effect when the deformation space 116 adjacent to the second liquid chamber 114 is communicated with the second gas chamber 46 by the switching unit 44 is the same as in the first embodiment. Moreover, also in this embodiment, there can exist an effect similar to 1st Embodiment.

In each embodiment, the case where the support 16 is fixed to the engine which is an example of the vibration generating unit and the cylinder 12 is connected to the vehicle body which is an example of the vibration receiving unit is described. It is not a thing. The cylindrical body 12 may be fixed to the engine side, which is an example of a vibration generating unit, and the support 16 may be connected to a vehicle body, which is an example of a vibration receiving unit.

The disclosure of Japanese Patent Application No. 2015-164133 filed on August 21, 2015 and the disclosure of Japanese Patent Application No. 2016-135249 filed on July 7, 2016 are hereby incorporated by reference in their entirety. Incorporated into the description.
All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually stated to be incorporated by reference, Incorporated herein by reference.

Claims

A cylinder coupled to one of the vibration generator and the vibration receiver;
A support coupled to the other of the vibration generator and the vibration receiver;
An elastic body for attaching the support to the cylinder so as to be relatively movable;
A first liquid chamber provided between the passage member formed in the cylindrical body and the elastic body and containing a liquid;
A second liquid chamber that is provided between the diaphragm that partitions the cylindrical body and the passage member, and in which a liquid flows between the first liquid chamber through a passage formed by the passage member;
A first gas chamber provided on the opposite side of the second liquid chamber via the diaphragm;
A second gas chamber isolated from the first gas chamber;
A switching unit for switching the first gas chamber and the second gas chamber to a communication state or a non-communication state;
A vibration isolator.
The vibration isolator according to claim 1, wherein the second gas chamber communicates only with the first gas chamber.
The vibration isolator according to claim 2, wherein the volume of the second gas chamber is set larger than the volume of the first gas chamber.
A cylinder coupled to one of the vibration generator and the vibration receiver;
A support coupled to the other of the vibration generator and the vibration receiver;
An elastic body for attaching the support to the cylinder so as to be relatively movable;
A first liquid chamber provided between the first membrane for partitioning the cylindrical body and the elastic body, and containing a liquid;
A first gas chamber provided between the first partition wall of the passage member partitioning the cylindrical body and the first membrane;
A second liquid chamber provided between the second membrane for partitioning the cylindrical body and the first partition wall, in which a liquid flows between the first liquid chamber via a passage formed by the passage member;
A deformation space provided between the second partition wall for partitioning the cylindrical body and the second membrane, and forming a deformation region of the second membrane;
A second gas chamber isolated from the first gas chamber;
A switching unit for switching the first gas chamber and the second gas chamber to a communication state or a non-communication state;
A vibration isolator.
The first gas chamber communicates with the second gas chamber through the deformation space,
The vibration isolator according to claim 4, wherein the switching unit switches a communication state between the first gas chamber and the second gas chamber via the deformation space.
The vibration isolator according to claim 4 or 5, wherein a volume of the second gas chamber is larger than a volume of the deformation space, and a volume of the deformation space is larger than a volume of the first gas chamber.