JP2011007222A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve characteristics with respect to vibration input in a predetermined frequency band while suppressing abnormal sound generated by a movable plate.SOLUTION: A second limited passage 42 is surrounded by a peripheral groove 33 and a circular plate 37. The second limited passage 42 communicates with an intermediate liquid chamber 58 through a communication hole 33A. The second limited passage 42 also communicates with an auxiliary chamber 52 through a communication hole 37B. In a recessed portion 31, a movable plate chamber 59 is formed between an upper retainer plate 32A and a lower retainer plate 36A. The movable plate chamber 59 is filled with liquid L. The circular plate-like movable plate 60 is arranged in the movable plate chamber 59. In the movable plate chamber 59, the movable plate 60 vibrates in an axial direction S between the upper retainer plate 32A and the lower retainer plate 36A.

Description

  The present invention relates to a vibration isolator that is used as an engine mount or the like in a general industrial machine or an automobile and absorbs and attenuates vibration transmitted from a vibration generating unit such as an engine to a vibration receiving unit such as a vehicle body.

  For example, an anti-vibration device as an engine mount is disposed between an engine that is a vibration generation unit of a vehicle and a vehicle body that is a vibration receiving unit, and the anti-vibration device absorbs vibration generated by the engine, Suppresses vibration transmission to the vehicle body. As such an anti-vibration device, a liquid-sealed device is known in which an elastic body and a pair of liquid chambers are provided inside the device, and the pair of liquid chambers communicate with each other through a restriction passage. According to this liquid-sealed vibration isolator, a damping effect is obtained by generating a damping force due to elastic deformation of the elastic body or liquid column resonance of the liquid in the orifice communicating between the pair of liquid chambers. Can do. Further, by disposing a movable film or a movable plate between a pair of liquid chambers, the dynamic spring constant for vibrations in a predetermined frequency band can be kept low, and transmission of vibrations from the engine to the vehicle body is suppressed. An anti-vibration effect can be obtained.

  As the conventional liquid-filled vibration isolator as described above, a vibration isolator having a plurality of orifices has been developed. Typically, the plurality of orifices are tuned to accommodate different frequencies. Therefore, liquid column resonances in the orifices occur in different frequency bands in different orifices (for example, in the shake orifice frequency band and in the idle orifice idle vibration frequency band). For this reason, as compared with a vibration isolator having only a single orifice, attenuation can be obtained in a wide frequency band, and the dynamic spring constant can also be lowered in a wide frequency band (see Patent Document 1). .

  The vibration isolator having a plurality of orifices as described above also has a problem that the dynamic spring constant increases in a frequency band higher than idle vibration, for example, in the frequency band of booming sound vibration. Therefore, in the technique described in Patent Document 1, the first orifice for obtaining a high vibration damping performance with respect to an input with a low frequency and a large amplitude and an excellent low dynamic spring characteristic with respect to an input with a medium frequency and a small amplitude are exhibited. And a movable member exhibiting excellent low dynamic spring characteristics with respect to vibration input with high frequency and minute amplitude.

  According to the vibration isolator disclosed in Patent Document 2, the dynamic spring constant can be lowered even with respect to a vibration input having a high frequency and a small amplitude higher than the idle vibration.

  However, since the 2nd orifice of patent documents 2 is constituted by a movable member, the size of a movable member becomes large. For this reason, the abnormal noise at the time of a collision will become large by the vibration of a movable member. Further, since the second orifice also moves due to the displacement of the movable member, the characteristics may not be easily obtained.

JP-A-9-10086 JP-A-1-229132

  The object of the present invention has been made in consideration of the above facts, and provides a vibration isolator capable of improving the characteristics with respect to vibration input in a predetermined frequency band while suppressing the hitting sound caused by the movable plate. The purpose is to do.

  In order to achieve the above object, a vibration isolator according to claim 1 of the present invention includes a first mounting member connected to one of a vibration generating portion and a vibration receiving portion, a cylindrical shape, and the vibration generating portion and the vibration receiving portion. A second attachment member connected to the other of the first attachment member, an elastic body disposed between the first attachment member and the second attachment member, and connecting the two together, and the elastic body as a part of the partition wall. A main liquid chamber that is configured inside the mounting member and encloses a liquid; a sub liquid chamber in which the liquid is encapsulated and at least a part of the partition wall is configured by a diaphragm; A movable wall member that can be displaced by a change in hydraulic pressure is used as a part of the partition wall, the partition member that partitions between the main liquid chamber and the sub liquid chamber, the partition member, and the main liquid chamber and the sub liquid chamber A first restriction passage communicating with the movable wall member and spaced apart from the movable wall member. An intermediate chamber member that constitutes an intermediate liquid chamber between the wall member and the intermediate chamber member, and is configured to communicate with the intermediate liquid chamber and the main liquid chamber, or the intermediate liquid chamber and the sub liquid chamber. 2 a restriction passage and a movable plate attached to the intermediate chamber member and displaced by a change in hydraulic pressure.

  In the vibration isolator having the above configuration, the second restriction passage is formed in the intermediate chamber member. Therefore, it is not necessary to form the second restriction passage in the movable plate, and the size of the movable plate can be reduced. Further, the second restriction passage does not move due to the vibration of the movable plate, and stable characteristics can be obtained.

The vibration isolator according to claim 2 of the present invention is characterized in that the movable plate includes a thermoplastic elastomer or a rubber material.

  By configuring the movable plate to include a thermoplastic elastomer and a rubber material, it is possible to reduce the weight of the movable plate as compared to the case of using a metal. Further, the hitting sound of the movable plate can be reduced.

The vibration isolator according to claim 3 of the present invention is such that the second restricted passage is tuned corresponding to vibration in a higher frequency band than the first restricted passage, and the movable plate corresponds to the corresponding frequency band of the second restricted passage. It is characterized by being tuned corresponding to vibration in a higher frequency band.

As described above, by tuning the second restriction passage in response to vibrations in a higher frequency band than the first restriction passage, the vibration input in the high frequency band where clogging occurs in the first restriction passage. The dynamic spring constant can be lowered. Further, by tuning the movable plate in response to vibration in a higher frequency band than the corresponding frequency band of the second restriction passage, the vibration input in the higher frequency band where clogging occurs in the second restriction passage, The dynamic spring constant can be lowered.

The vibration isolator according to claim 4 of the present invention is characterized in that the movable plate is attached to the movable plate chamber formed in the central portion of the intermediate chamber member, and the second restriction passage is formed on the outer periphery of the movable plate chamber. And

By setting it as the said structure, it can be set as a compact structure, comprising a movable plate and a 2nd restriction path separately.

  As described above, according to the present invention, it is possible to improve characteristics with respect to vibration input in a predetermined frequency band while suppressing abnormal noise due to the movable plate.

It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is a disassembled perspective view which shows the structure of the partition member of the vibration isolator which concerns on embodiment of this invention, a movable plate, and an intermediate chamber member. It is a schematic diagram of the vibration isolator which concerns on embodiment of this invention. It is a graph which shows the dynamic spring characteristic of the vibration isolator which concerns on embodiment of this invention. It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on the modification of embodiment of this invention. It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on the other modification of embodiment of this invention. It is a schematic diagram of the vibration isolator which concerns on the other modification in embodiment of this invention.

  Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a vibration isolator 10 according to an embodiment of the present invention. The vibration isolator 10 is applied as an engine mount that supports an engine that is a vibration generating unit in an automobile to a vehicle body that is a vibration receiving unit. Note that the symbol S in the figure indicates the axis of the apparatus, the direction along the axis is the axis direction S of the apparatus, and the vertical direction in the figure is the vertical direction of the vibration isolator 10 in the following description. Main vibration (main vibration) for the purpose of vibration isolation is input in the axial direction S.

  As shown in FIG. 1, the vibration isolator 10 includes a first attachment member 14 and a second attachment member 12.

  The 2nd attachment member 12 is made into a substantially cylindrical shape, and the concave step part 12A is comprised in the one end part. A crimped portion 12 </ b> C that is crimped radially inward is formed at the other end of the second mounting member 12. A partition pinching portion 12B is formed between the concave step portion 12A and the caulking portion 12C. The second mounting member 12 is connected to the vehicle body via a bracket (not shown).

  The first mounting member 14 is disposed on the radial inner side of the second mounting member 12 and on the upper side of the second mounting member 12 in the axial direction S when viewed from the axial direction S. The elastic body connecting portion 14A, the flange portion 14B, And the bracket insertion part 14C is provided. 14 A of elastic body connection parts are made into the truncated cone shape which becomes a small diameter below. The flange portion 14B has a disk shape projecting radially outward from the upper portion of the elastic body connecting portion 14A. The bracket insertion portion 14C is formed in a cylindrical shape having a smaller diameter than the flange portion 14B, extends upward from the flange portion 14B, and has a screw hole 14D in which a female screw is formed from the upper surface central portion toward the lower side in the axial direction. ing. A bolt (not shown) for connecting to the engine side bracket is screwed into the screw hole 14D. The first mounting member 14 is connected to the engine via a bracket on the engine side.

  The first mounting member 14 and the second mounting member 12 are arranged so as to be coaxial with each other. These axes are the axial direction S of the vibration isolator 10.

  Between the first mounting member 14 and the second mounting member 12, a rubber elastic body 16 serving as a main vibration absorber is disposed. The elastic body 16 is vulcanized and bonded from the outer surface of the elastic body connecting portion 14A of the first mounting member 14 to the lower surface of the flange portion 14B, and vulcanized and bonded to the radially inner side surface of the recessed step portion 12A of the second mounting member 12. Has been. The first attachment member 14 and the second attachment member 12 are elastically connected by the elastic body 16.

  The elastic body 16 is integrally formed with a thin film-like covering portion 18 extending downward from the lower end portion thereof. The covering portion 18 is vulcanized and bonded to the inner peripheral surfaces of the partition holding portion 12B and the caulking portion 12C of the second mounting member 12 to cover the inner wall of the second mounting member 12. A step portion 12E is formed in a portion corresponding to the space between the recessed step portion 12A of the covering portion 18 and the partition holding portion 12B. A positioning member 20 described later is brought into contact with the stepped portion 12E for positioning.

The elastic body 16 is integrally formed with a stopper rubber portion 16A that extends upward from the upper end portion thereof and covers the outer peripheral surface and the upper surface of the flange portion 14B. The stopper rubber portion 16A hits a stopper fitting (not shown) disposed outside the elastic body 16 and the first mounting member 14, so that the first mounting member 14 and the second mounting member 12 at the time of large vibration input. Regulate the amount of relative movement.

  A partition member 20 is disposed on the inner peripheral side of the covering portion 18. As shown also in FIG. 2, the partition member 20 is annular, and a spiral groove M is formed on the outer periphery. Between this groove | channel M and the coating | coated part 18, the 1st restriction | limiting channel | path 40 which connects the main liquid chamber 50 mentioned later and the subliquid chamber 52 is comprised.

  A hollow is formed on the inner peripheral side of the partition member 20, and the upper opening 22 is closed by a membrane 24 as a movable partition member. The membrane 24 is made of an elastically deformable film such as rubber or thermoplastic elastomer (TPE). In addition, a stepped portion 26 having a large diameter on the lower side is formed in an intermediate portion of the inner peripheral wall of the partition member 20. An intermediate chamber member 30 is fitted into the hollow lower side on the inner peripheral side of the partition member 20. Details of the intermediate chamber member 30 will be described later.

  A ring 54 is disposed on the inner peripheral side of the covering portion 18 below the partition member 20. An outer peripheral portion of a thin film rubber diaphragm 56 is vulcanized and bonded to the inner peripheral surface of the ring 54 so as to close the inside of the ring 54. The partition member 20 is inserted into the second mounting member 12 so as to be in contact with the step portion 26, and the ring 54 is inserted into the second mounting member 12 so as to be in contact with the partition member 20. Yes. As for the 2nd attachment member 12, the crimping part 12C is crimped to the inner peripheral side. Thereby, the partition member 20 and the ring 54 are fixed in the second attachment member 12. In this state, the ring 54 is pressed against the inner peripheral wall of the second mounting member 12 via the covering portion 18, and the space inside the second mounting member 12 and the elastic body 16 is sealed from the outside by the diaphragm 56. Has been. In this sealed space, incompressible liquid L such as water or ethylene glycol is sealed. This sealed space is partitioned by the partition member 20 into a main liquid chamber 50 on the elastic body 16 side and a sub liquid chamber 52 on the diaphragm 56 side.

  The main liquid chamber 50 is configured with the elastic body 16 and the partition member 20 as partitions inside the second mounting member 12. The main liquid chamber 50 is filled with the liquid L. The secondary liquid chamber 52 is configured with the diaphragm 56 and the partition member 20 as partitions inside the second elastic member 12. The sub liquid chamber 52 is filled with the liquid L. The diaphragm 56 is deformed by a change in the hydraulic pressure in the sub liquid chamber 52, and the sub liquid chamber 52 can be expanded and contracted.

As shown in FIG. 2, the intermediate chamber member 30 includes an upper member 32 and a lower member 36. The upper member 32 is formed in a disk shape having a thickness, and a circumferential groove 33 having a lower side opened along the outer edge portion. The circumferential groove 33 is formed with a communication hole 33A on the upper side of one end. An intermediate liquid chamber 58 is formed between the upper member 32 and the membrane 24 (see FIG. 1). The intermediate liquid chamber 58 is configured to be surrounded by the membrane 24, the inner wall of the partition member 20, and the upper member 32, and is filled with the liquid L similarly to the main liquid chamber 50 and the sub liquid chamber 52. The intermediate liquid chamber 58 is communicated with the sub liquid chamber 52 via a second restriction passage 42 described later.

A recess 31 is formed on the inner diameter side of the circumferential groove 33 of the upper member 32. The recess 31 is a cylindrical recess that is open on the lower side. An upper opening 31A is formed above the recess 31 (bottom of the recess), and the upper opening 31A is partitioned by an upper pressing plate 32A to form a plurality of holes.

Between the recess 31 and the circumferential groove 33, a peripheral partition wall 34 is formed that is convex from the upper surface of the upper member 32 to the lower side. The circumferential partition 34 is configured such that the width in the axial direction S is shorter than the width in the axial direction S of the outer end portion of the upper member 32.

The lower member 36 has a substantially disc shape and includes a disc portion 37 and a peripheral rib 38. The disc portion 37 has a disc shape whose outer diameter is slightly smaller than the outer diameter of the circumferential groove 33, and a lower opening 37A is formed at the center. The lower opening 37A is partitioned by a lower pressing plate 36A to form a plurality of holes. In addition, a communication hole 37 </ b> B is formed in the disk portion 37 at a portion corresponding to the other end on the opposite side of the communication hole 33 </ b> A of the circumferential groove 33.

The circumferential rib 38 is formed on the upper surface of the disc portion 37 along the lower opening 37 </ b> A, and is an annular ridge. The outer diameter of the circumferential rib 38 is slightly smaller than the inner diameter of the recess 31.

The lower plate portion 36 is engaged with the upper plate portion 32 with the disc portion 37 fitted inside the circumferential groove 33 and the circumferential rib 38 fitted inside the recess 31. As a result, the lower side of the circumferential groove 33 is closed, and the second restriction passage 42 is formed by being surrounded by the circumferential groove 33 and the disc portion 37. The second restriction passage 42 communicates with the intermediate liquid chamber 58 through the communication hole 33A. Further, the second restriction passage 42 communicates with the auxiliary liquid chamber 52 through the communication hole 37B.

In the recess 31, a movable plate chamber 59 is formed between the upper pressing plate 32A and the lower pressing plate 36A. The movable plate chamber 59 is filled with the liquid L. A disc-shaped movable plate 60 is disposed in the movable plate chamber 59. A distance D1 between the upper pressing plate 32A and the lower pressing plate 36A is longer than the thickness of the movable plate 60. Thus, the movable plate 60 can vibrate in the axial direction S between the upper pressing plate 32A and the lower pressing plate 36A in the movable plate chamber 59. The movable plate 60 is preferably made of a thermoplastic elastomer (TPE), a rubber material, or the like so as to be able to mitigate the hitting sound when it collides with the lower presser plate 36A and the lower presser plate 36A due to vibration.

FIG. 3 schematically shows the vibration isolator 10 having the above-described configuration. The vibration isolator 10 of this embodiment can be shown as shown in FIG.

Briefly describing FIG. 3, the liquid chamber surrounded by the second mounting member 12, the elastic body 16, and the diaphragm 56 is divided into a main liquid chamber 50 and a sub liquid chamber 52 by the partition member 20. . The main liquid chamber 50 and the sub liquid chamber 52 communicate with each other through the first restriction passage 40. Between the main liquid chamber 50 and the sub liquid chamber 52, an intermediate liquid chamber 58 is provided in parallel with the first restriction passage 40. The intermediate liquid chamber 58 is closed by the membrane 24 on the main liquid chamber 50 side. A second restriction passage 42 is formed between the main liquid chamber 50 and the sub liquid chamber 52 in series with the membrane 24 and closer to the sub liquid chamber 52 than the membrane 24. In addition, a movable plate 60 is disposed on the side of the auxiliary liquid chamber 52 with respect to the membrane 24, in series with the membrane 24 and in parallel with the second restriction passage 42.

Next, tuning of the first restriction passage 40, the second restriction passage 42, the movable plate chamber 59, and the movable plate 60 will be described.

When vibration in the axial direction S is input from the side of the first mounting member 14 connected to the engine, the elastic body 16 is elastically deformed, and the internal volume of the main liquid chamber 50 is expanded and contracted along with this elastic deformation. The first restriction passage 40 is tuned so as to cope with a large amplitude shake vibration in a relatively low frequency range of the input vibration in the axial direction S from the first mounting member 14 side. That is, when the shake vibration is input, the liquid L sealed in the main liquid chamber 50 and the liquid L sealed in the sub liquid chamber 52 due to the pressure difference between the main liquid chamber 50 and the sub liquid chamber 52 are transferred to the first restriction passage. It is set to be able to obtain a vibration isolation effect and a vibration suppression effect by the liquid column resonance action in the first restriction passage 40 and the like. For example, the first restriction passage 40 can be set so that its path length and cross-sectional area are adapted to shake vibration input with an amplitude of ± 0.5 mm or more and a frequency band of 5 Hz to 15 Hz.

  The second restriction passage 42 corresponds to an input vibration having a higher frequency and a smaller amplitude than the shake vibration among the input vibrations in the axial direction S from the first mounting member 14 side, so-called medium amplitude idle vibration in a medium frequency range. Tuned to be. That is, when the idle vibration is input, the liquid L sealed in the main liquid chamber 50 elastically deforms the membrane 24 and expands / contracts the intermediate liquid chamber 58 due to a change in the liquid pressure in the main liquid chamber 50. Then, the liquid L flows between the intermediate liquid chamber 58 and the sub liquid chamber 52 through the second restriction passage 42, and the anti-vibration effect and the control are achieved by the liquid column resonance action in the second restriction passage 42. It is set so that a vibration effect can be obtained. For example, the second restriction passage 42 can be set so that its path length and cross-sectional area are adapted to an input of idle vibration having an amplitude of about ± 0.1 mm and a frequency band of 20 Hz to 40 Hz.

  The movable plate chamber 59 and the movable plate 60 correspond to input vibrations having a higher frequency and a smaller amplitude than the idle vibrations among the input vibrations in the axial direction S from the first mounting member 14 side, that is, so-called small-amplitude heavy vibrations in a high frequency range. Tuned to be. That is, when a booming sound vibration is input, the liquid L sealed in the main liquid chamber 50 elastically deforms the membrane 24 due to a change in the liquid pressure in the main liquid chamber 50, and the liquid L in the intermediate liquid chamber 58 passes through the liquid L. The vibration is transmitted to the movable plate 60, and the movable plate 60 is caused to vibrate in response to the vibration, so that a vibration isolation effect and a vibration suppression effect can be obtained. For example, the movable plate chamber 59 has an opening diameter, and the movable plate 60 has a diameter and an amplitude D1 in the axial direction S that are within ± 0.05 mm in amplitude and a frequency band of 50 Hz to 150 Hz, so that it can be adapted to input of booming sound vibration. Can be set.

  Next, the operation and action of the vibration isolator 10 according to the present embodiment will be described.

  In the vibration isolator 10 of the present embodiment, vibration from the automobile engine is supported on the vehicle body via the first mounting member 14, the elastic body 16, and the second mounting member 12. At this time, the vibration is absorbed by the resistance based on the internal friction of the elastic body 16.

  When a relatively low frequency and large amplitude shake vibration (frequency 5 to 15 Hz, amplitude ± 0.5 mm or more) is input, the elastic body 16 is elastically deformed and the main liquid chamber 50 expands and contracts, and the liquid L passes through the first restriction passage. The vibration control effect can be obtained by going back and forth between the main liquid chamber 50 and the sub liquid chamber 52 via 40 and by a liquid column resonance action inside the first restriction passage 40.

  When an idle vibration with a medium frequency and amplitude (frequency 20 to 40 Hz, amplitude ± 0.1 mm) is input, the first restriction passage 40 is clogged. On the other hand, the membrane 24 is elastically deformed according to the change in the hydraulic pressure in the main liquid chamber 50, and the liquid L flows through the opening 22. As a result, the liquid pressure in the intermediate liquid chamber 58 also changes, and the liquid L moves back and forth between the intermediate liquid chamber 58 and the sub liquid chamber 52 via the second restriction passage 42 tuned so as to be adapted to idle vibration. In addition, an anti-vibration effect can be obtained by a liquid column resonance action in the second restriction passage 42.

  At the time of inputting a high frequency, small amplitude boom sound vibration (frequency 50 Hz to 150 Hz, amplitude ± 0.05 mm or less), the first restriction passage 40 and the second restriction passage 42 are clogged. On the other hand, the membrane 24 is elastically deformed according to the change in the hydraulic pressure in the main liquid chamber 50, and the liquid L flows through the opening 22. As a result, vibration is transmitted to the movable plate 60 via the liquid L in the intermediate liquid chamber 58, and an increase in the dynamic spring constant can be suppressed by the movable plate 60 tuned so as to be adapted to the booming noise vibration.

  FIG. 4 shows a graph showing the relationship between the vibration frequency input to the vibration isolator 10 and the dynamic spring constant of the vibration isolator 10. The solid line A indicates the characteristics of the vibration isolator 10 according to the present invention, and the alternate long and short dash line B indicates the characteristics of the vibration isolator J when the movable plate 60 is not provided.

  As can be seen from this graph, both the vibration isolator 10 of the present embodiment and the vibration isolator J of the conventional example have dynamic springs in the frequency band of shake vibration (shake area) and in the frequency band of idle vibration (idle area). A constant can be made low and the anti-vibration effect can be acquired effectively. However, the dynamic spring constant of the vibration isolator J of the conventional example is high in the frequency band of the muffled sound (the muffled sound region), and it is difficult to obtain a vibration isolation effect. On the other hand, the vibration isolator 10 of the present embodiment can reduce the dynamic spring constant even in the booming sound region, and can effectively obtain a vibration isolating effect.

  As described above, in this embodiment, using the movable plate 60 that vibrates in the movable plate chamber 59, the dynamic spring constant in the booming sound frequency band can be maintained low, and the characteristics against input vibration can be improved. .

  Further, in the vibration isolator 10 of the present embodiment, the second restriction passage 42 is configured in the intermediate chamber member 30 that is a separate member from the movable plate 60. Therefore, the size of the movable plate 60 can be reduced as compared with the case where the second restriction passage 42 is formed in the movable plate 60. In addition, by forming the movable plate 60 using a thermoplastic elastomer (TPE) or a rubber material, it is possible to suppress abnormal noise during vibration of the movable plate 60.

  In the present embodiment, the hollow main liquid chamber 50 side of the partition member 20 is closed with the membrane 24, and the sub liquid chamber 52 side is closed with the intermediate chamber member 30 to configure the intermediate liquid chamber 58. As shown in FIG. 5, the membrane 24 and the intermediate chamber member 30 are reversely arranged, the main liquid chamber 50 side is closed by the intermediate chamber member 30 and the secondary liquid chamber 52 side is closed by the membrane 24. it can.

  In addition, as shown in FIG. 6, the intermediate liquid chamber 58 can be configured by providing a movable plate 62 instead of the membrane 24.

  In the present embodiment, the membrane 24 and the movable plate 60 are arranged in series between the main liquid chamber 50 and the sub liquid chamber 52. However, as shown in FIG. May be arranged in parallel.

10 vibration isolator 12 second attachment member 14 first attachment member 16 elastic body 20 partition member 24 membrane 30 intermediate chamber member 40 first restriction passage 42 second restriction passage 50 main liquid chamber 52 sub liquid chamber 56 diaphragm 58 intermediate liquid chamber 59 Intermediate liquid chamber 60 Movable plate S Axial direction

Claims (4)

A first attachment member coupled to one of the vibration generating portion and the vibration receiving portion;
A second mounting member that is cylindrical and connected to the other of the vibration generating portion and the vibration receiving portion;
An elastic body disposed between the first mounting member and the second mounting member and connecting the two;
A main liquid chamber that is configured inside the second mounting member with the elastic body as a part of a partition wall, and in which a liquid is enclosed;
A sub liquid chamber in which liquid is enclosed, at least a part of the partition wall is configured by a diaphragm, and can be expanded and contracted according to a change in hydraulic pressure;
A movable wall member that can be displaced by a change in hydraulic pressure as a part of the partition wall, and a partition member that partitions between the main liquid chamber and the sub liquid chamber;
A first restriction passage configured in the partition member to communicate the main liquid chamber and the sub liquid chamber;
An intermediate chamber member that is disposed apart from the movable wall member and forms an intermediate liquid chamber between the movable wall member;
A second restriction passage configured in the intermediate chamber member for communicating the intermediate liquid chamber and the main liquid chamber, or the intermediate liquid chamber and the sub liquid chamber;
A movable plate attached to the intermediate chamber member and displaced by a change in hydraulic pressure;
Anti-vibration device with   The vibration isolator according to claim 1, wherein the movable plate includes a thermoplastic elastomer or a rubber material.   The second restricting passage is tuned corresponding to vibration in a high frequency band than the first restricting passage, and the movable plate is tuned corresponding to vibration in a high frequency band than the corresponding frequency band of the second restricting passage. The vibration isolator according to claim 1 or 2, characterized in that   The said movable plate is attached to the movable plate chamber comprised in the center part of the said intermediate chamber member, The said 2nd restriction | limiting channel | path is comprised in the outer periphery of the said movable plate chamber, The any one of Claims 1-3 characterized by the above-mentioned. The vibration isolator of Claim 1.

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