JP5135240B2 - Vibration isolator - Google Patents

Description

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

  As this type of vibration isolator, conventionally, for example, as shown in Patent Document 1 below, an outer cylinder connected to one of a vibration generator and a vibration receiver, and a vibration generator and a vibration receiver An inner cylinder connected to one of the other, an elastic body that elastically connects the outer cylinder and the inner cylinder, and a partition member that partitions a liquid chamber formed inside the outer cylinder into a main liquid chamber and a sub liquid chamber A configuration including the above is known. The partition member described above is provided with an annular restriction passage member in which a restriction passage for communicating the main liquid chamber and the sub liquid chamber is formed, and a membrane for closing the inside of the restriction passage member. In the vibration isolator having such a configuration, when a shake vibration that is a vibration having a large amplitude and a low frequency range (for example, 8 Hz to 15 Hz) is input, the liquid sealed in the liquid chamber passes through the restriction passage and enters the main liquid chamber. Since the liquid column resonance occurs in the liquid flowing through the restriction passage, the vibration is attenuated.

JP-A-2005-36850

However, in the above-described conventional vibration isolator, when a large bounce direction vibration is input to the vibration isolator and the hydraulic pressure in the main liquid chamber suddenly rises, a reaction vibration is input in the rebound direction. The liquid flowing from the liquid chamber side to the main liquid chamber side is clogged in the restricted passage. As a result, the liquid pressure in the main liquid chamber is rapidly reduced, and a large number of bubbles are generated in the liquid on the main liquid chamber side. There is a problem that cavitation occurs.
In addition, by using a soft membrane (with a small spring multiplier), even if clogging occurs in the restricted passage, the membrane is greatly elastically deformed toward the main liquid chamber. However, in this case, it is difficult for the liquid to flow into the restriction passage even during shake vibration due to the pressure releasing action of the membrane, and the damping effect due to the liquid column resonance in the restriction passage is difficult to be exhibited. Occurs.

  The present invention takes the above-described conventional problems into consideration, and can effectively exhibit vibration attenuation by the restriction passage when a shake vibration is input, and can prevent cavitation when a large vibration is input. The purpose is to provide.

  An anti-vibration device according to the present invention elastically couples an outer cylinder connected to one of a vibration generator and a vibration receiver, an inner cylinder connected to the other, the outer cylinder and the inner cylinder. And a partition member that divides the liquid chamber in the outer cylinder into a main liquid chamber on one side and a sub liquid chamber on the other side, the elastic body being a part of the wall surface. A liquid-filled vibration isolator having a restriction passage communicating the main liquid chamber and the sub liquid chamber, wherein an outer peripheral portion of the partition member is folded back toward one side in the axial direction. An elastically deformable membrane and a holding member made of a rigid body that holds the outer peripheral portion of the membrane are provided, and the holding member has a pair of fixing portions that clamp the outer peripheral portion of the membrane from the outer cylinder axial direction. One of the pair of fixed portions disposed on one side in the axial direction. The outer peripheral part of the membrane is fixed to the fixed part, and the outer peripheral part of the membrane is detachably contacted to the other fixing part disposed on the other side in the axial direction. The outer peripheral portion is precompressed in the axial direction.

  Due to these features, when normal vibration (shake vibration) is input from the vibration generator to the anti-vibration device, the membrane is elastically deformed in the axial direction in synchronization with fluctuations in the hydraulic pressure in the main liquid chamber accompanying the vibration input. To do. At this time, since the outer peripheral part of the membrane is sandwiched between the pair of fixed parts in a precompressed state, the membrane is displaced relatively small. Therefore, the liquid sealed in the liquid chamber passes between the main liquid chamber and the sub liquid chamber through the restriction passage, and liquid column resonance occurs in the liquid flowing through the restriction passage, and the input vibration is attenuated. .

  On the other hand, when a large vibration is input from the vibration generating unit to the vibration isolator, the elastic body is greatly elastically deformed with the vibration input, and a large positive pressure or negative pressure is input to the main liquid chamber. At this time, when either one of positive pressure and negative pressure is input (when the inner cylinder is displaced relative to the outer cylinder from the one side in the axial direction toward the other side), the membrane Since the lower surface of the outer peripheral portion is pressed by the other fixing portion disposed on the other side in the axial direction, the membrane is displaced relatively small toward the other side in the axial direction. On the other hand, when one of the positive pressure and negative pressure is input (when the inner cylinder is displaced relative to the outer cylinder in the axial direction from the other side toward the one side), the outer circumference of the membrane Since the membrane is elastically deformed while the lower surface of the portion is separated from the other fixed portion, the membrane is displaced relatively large toward one side in the axial direction.

  For example, when one fixed part is disposed on the main liquid chamber side and the other fixed part is disposed on the sub liquid chamber side, the lower surface of the outer peripheral part of the membrane is pressed by the other fixed part when positive pressure is input. The membrane is displaced slightly toward the auxiliary liquid chamber, and when the negative pressure is subsequently input by rebound, the lower surface of the outer peripheral portion of the membrane is separated from the other fixed portion, and the membrane is largely displaced toward the main liquid chamber. As a result, a rapid decrease in the hydraulic pressure in the main liquid chamber during a large input can be suppressed. On the other hand, when one fixed part is disposed on the secondary liquid chamber side and the other fixed part is disposed on the main liquid chamber side, the lower surface of the outer peripheral part of the membrane is separated from the other fixed part when positive pressure is input. Then, when the membrane is greatly displaced to the main liquid chamber side and the negative pressure is increased due to subsequent rebound, the membrane largely displaced to the secondary liquid chamber side once returns to its original shape and then returns to the main liquid chamber side. Displaces slightly. As a result, a rapid decrease in the hydraulic pressure in the main liquid chamber during a large input can be suppressed.

  According to the vibration isolator of the present invention, the membrane is greatly displaced toward one side in the axial direction when a large vibration is input without reducing the hardness of the membrane. Vibration damping can be exhibited effectively, and cavitation can be prevented when a large vibration is input.

It is a longitudinal cross-sectional view of the vibration isolator for demonstrating embodiment of this invention. It is a fragmentary sectional view of the vibration isolator for demonstrating embodiment of this invention.

Embodiments of a vibration isolator according to the present invention will be described below based on the drawings.
FIG. 1 is a vertical cross-sectional view of the vibration isolator 10 according to the present embodiment cut along the axis S, and FIG. 2 is a partial cross-sectional view of the vibration isolator 10 showing the operation of a partition member 15 described later.
In addition, the code | symbol S shown in FIG. 1 has shown the center axis line of the vibration isolator 10, and is only described as "the axial center S" below. Further, a direction along the axis S is referred to as “axial direction”, a direction perpendicular to the axis S is referred to as “radial direction”, and a direction around the axis S is referred to as “circumferential direction”.
Further, the lower side in FIG. 1 is the bounce side, that is, the direction in which a static load (initial load) is input when the vibration isolator 10 is installed, and the upper side in FIG. 1 is the rebound side, that is, the input direction of the static load. In the following description, the bound side is “down” and the rebound side is “up”.

  First, the structure of the vibration isolator 10 in this Embodiment is demonstrated.

  As shown in FIG. 1, the vibration isolator 10 is 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. The vibration isolator 10 includes an outer cylinder 11, an inner cylinder 12 disposed substantially coaxially above the inner peripheral side of the outer cylinder 11, and an elasticity that elastically connects the outer cylinder 11 and the inner cylinder 12. And a body 13.

  The outer cylinder 11 is formed with a cylindrical large-diameter portion 20 at the upper end portion, and a cylindrical small-diameter portion 21 having a small diameter with respect to the large-diameter portion 20 at the lower end side. Between the large-diameter portion 20 and the small-diameter portion 21, a narrowed portion 22 that is reduced in diameter toward the inner peripheral side is formed over the entire circumference. The small diameter portion 21 is fitted inside a cylindrical portion of a vehicle body side bracket (not shown), and the outer cylinder 11 is fixed to the vehicle body side via the vehicle body side bracket.

  The inner cylinder 12 is a columnar member extending in the axial direction. The lower part of the inner cylinder 12 has a tapered shape that is gradually reduced in diameter as it goes downward. A screw hole 23 extending in the axial direction from the center of the upper end surface of the inner cylinder 12 is formed in the upper part of the inner cylinder 12. A bolt 24 of an engine side bracket (not shown) is screwed into the screw hole 23 and fixed, and the inner cylinder 12 is fixed to the engine side via the engine side bracket. In addition, an anchor portion 25 that protrudes radially outward is formed at an axially intermediate portion of the inner cylinder 12.

  The elastic body 13 is a rubber body that closes the upper opening of the outer cylinder 11, and the closed outer peripheral surface is vulcanized and bonded to the inner diameter surface of the large-diameter portion 20 and the throttle portion 22 of the outer cylinder 11, The peripheral surface is vulcanized and bonded to the lower outer peripheral surface of the inner cylinder 12. An inner ring 26 disposed between the outer cylinder 11 and the inner cylinder 12 is embedded in the elastic body 13. A rubber cover 27 that covers the anchor portion 25 is integrally formed at the upper end of the elastic body 13, and a rebound stopper is formed by the rubber cover 27 and the anchor portion 25. A rubber film 28 that covers the inner peripheral surface of the small diameter portion 21 is integrally formed at the lower end of the elastic body 13. As the elastic body 13, an elastic body made of synthetic resin or the like can be used in addition to rubber.

  On the other hand, the vibration isolator 10 is provided with a diaphragm 14 that closes the lower opening of the outer cylinder 11. The diaphragm 14 is a lid that is fitted inside the small-diameter portion 21 of the outer cylinder 11. As a schematic configuration, the diaphragm 14 has a substantially cylindrical diaphragm ring 30 and a membrane-like diaphragm rubber that closes the inside of the diaphragm ring 30. 31. The diaphragm rubber 31 is a bowl-shaped rubber film, and the outer edge portion thereof is vulcanized and bonded to the inner peripheral surface of the diaphragm ring 30. When the diaphragm 14 having such a configuration is fitted inside the small diameter portion 21 of the outer cylinder 11, the lower end portion of the diaphragm ring 30 together with the lower end portion of the small diameter portion 21 is crimped radially inward over the entire circumference. It is fixed by that. The rubber film 28 described above is interposed between the outer peripheral surface of the diaphragm ring 30 and the inner peripheral surface of the small diameter portion 21 of the outer cylinder 11, thereby fitting the diaphragm 14 and the outer cylinder 11. The water-tightness of the location is ensured.

  A liquid chamber 16 in which a liquid such as ethylene glycol or water is enclosed is formed inside the outer cylinder 11. The liquid chamber 16 is hermetically sealed by the elastic body 13 and the diaphragm 14 described above. The liquid chamber 16 is divided into an upper main liquid chamber 17 and a lower sub liquid chamber 18 by a partition member 15 disposed inside the outer cylinder 11. The main liquid chamber 17 is a liquid chamber formed with the elastic body 13 as a part of the partition wall, and the internal volume changes due to the deformation of the elastic body 13. The auxiliary liquid chamber 18 is a liquid chamber in which the diaphragm 14 is a part of the partition wall, and the internal volume changes due to the deformation of the diaphragm rubber 31 of the diaphragm 14.

  The partition member 15 includes an elastically deformable membrane 50 and a holding member 70 made of a rigid body that holds the outer peripheral portion 52 of the membrane 50.

  The holding member 70 includes an annular restriction passage member 40 in which a restriction passage 41 that communicates the main liquid chamber 17 and the sub liquid chamber 18 is formed, an annular pressing plate 60 that is joined to the upper surface of the restriction passage member 40, It has.

  The restriction passage member 40 is an annular member fitted inside the small diameter portion 21 of the outer cylinder 11, and is a member made of a rigid body such as metal or resin. A circumferential groove 40 a is formed on the outer circumferential surface of the restriction passage member 40, and a restriction passage 41 is formed by closing an outer peripheral side opening portion of the circumferential groove 40 a with the rubber film 28. . Further, the restriction passage member 40 has a main liquid chamber side communication port (not shown) that communicates the one end of the restriction passage 41 in the flow passage direction with the main liquid chamber 17, and the other end of the restriction passage 41 in the flow passage direction and the auxiliary passage. A sub liquid chamber side communication port (not shown) that communicates with the liquid chamber 18 is formed. Further, a fixed portion 42 that protrudes radially inward is formed on the inner peripheral surface of the restriction passage member 40 over the entire circumference. The annular fixing portion 42 is a receiving portion that presses the outer peripheral portion 52 of the membrane 50 from below, and includes an annular plate portion.

  The holding plate 60 is an annular plate member made of a rigid body such as metal or resin. The outer diameter of the pressing plate 60 is substantially the same as the outer diameter of the restricting passage member 40, and the outer periphery of the pressing plate 60 is joined to the upper surface of the restricting passage member 40 by welding, rivets, or the like. The inner peripheral portion of the pressing plate 60 protrudes radially inward from the upper end surface of the restriction passage member 40, and serves as a fixing portion 61 that presses the outer peripheral portion 52 of the membrane 50 from above. The fixing portion 61 is disposed to face the fixing portion 42 of the restriction passage member 40 described above. Note that the inner diameter of the fixing portion 61 of the pressing plate 60 is larger than the inner diameter of the fixing portion 42 of the restriction passage member 40, and the lower fixing portion 42 protrudes radially inward from the upper fixing portion 61.

  The membrane 50 is an elastically deformable rubber plate and is a plate portion that closes the inside of the restriction passage member 40. The membrane 50 includes a disk-shaped pressure receiving portion 51 disposed perpendicular to the axis S and an annular outer peripheral portion 52 disposed on the outer periphery of the pressure receiving portion 51. The pressure receiving portion 51 is disposed inside the annular holding plate 60 in plan view. The outer peripheral portion 52 has a shape folded back toward the upper side in the axial direction. More specifically, the outer peripheral portion 52 has a substantially V-shaped bent shape that protrudes downward. The outer peripheral portion 52 of the membrane 50 is sandwiched between the fixing portion 61 of the pressing plate 60 and the fixing portion 42 of the restriction passage member 40. The upper end surface of the outer peripheral portion 52 of the membrane 50, that is, the outer end surface of the membrane 50 formed upward is fixed to the lower surface of the fixing portion 61 of the pressing plate 60 by vulcanization adhesion or the like. Further, the lower surface of the outer peripheral portion 52 of the membrane 50 is in contact with the upper surface of the fixed portion 42 of the restriction passage member 40 so as to be separable. That is, the lower surface of the outer peripheral portion 52 of the membrane 50 is in close contact with the upper surface of the fixed portion 42 of the restriction passage member 40 in an unbonded state. Further, the outer peripheral portion 52 of the membrane 50 is pre-compressed in the axial direction by the fixing portion 61 of the pressing plate 60 and the fixing portion 42 of the restriction passage member 40, and a pair of upper and lower fixing portions 42 in an elastically deformed state. , 61.

  Next, the operation of the above-described vibration isolator 10 will be described.

  In the vibration isolator 10 having the above-described configuration, the inner cylinder 12 is connected to an engine (not shown) via an engine side bracket (not shown), and the outer cylinder 11 is not shown via a vehicle body side bracket (not shown). By being connected to the vehicle body, it is interposed between the engine and the vehicle body.

  When the engine is operated, the vibration is transmitted to the inner cylinder 12 of the vibration isolator 10 through the engine side bracket, and the vibration isolator 10 has a relatively low frequency vibration, that is, during idling. A shake vibration having a larger amplitude and a smaller frequency (for example, 8 Hz to 15 Hz) is input. At this time, the membrane 50 is elastically deformed in the axial direction in synchronization with the fluid pressure fluctuation of the main fluid chamber 17 due to vibration input, but the outer peripheral portion 52 of the membrane 50 is in a precompressed state between the pair of fixing portions 42 and 61. Therefore, the membrane 50 is displaced relatively small. For this reason, the liquid pressure of the main liquid chamber 17 fluctuates with the repeated movement of the inner cylinder 12 in the vertical direction by the shake vibration (the movement that repeats the movement toward the bounce side and the movement in the rebound direction alternately), and the main liquid chamber An internal pressure difference is generated between 17 and the auxiliary liquid chamber 18. In this case, the liquid in the liquid chamber 16 passes between the main liquid chamber 17 and the sub liquid chamber 18 through the restriction passage 41. At this time, the restriction passage 41 is tuned so that its flow path length and cross-sectional area correspond to the shake vibration, so that a resonance phenomenon (liquid column resonance) occurs in the liquid flowing through the restriction passage 41 and the shake vibration is attenuated. As a result, vibration transmitted to the vehicle body is reduced.

  Further, when the engine and the vehicle body are largely displaced due to road surface unevenness or the like, a large vibration having a larger amplitude than the shake vibration may be input to the vibration isolator 10. For example, when the inner cylinder 12 moves greatly downward relative to the outer cylinder 11 and a positive load (load in the bound direction) is input to the vibration isolator 10, the inner volume of the main liquid chamber 17 is reduced. As a result, the hydraulic pressure in the main liquid chamber 17 increases rapidly. At this time, as shown in FIG. 2A, the lower surface of the outer peripheral portion 52 of the membrane 50 is pressed by the fixing portion 42 of the restriction passage member 40. Therefore, the membrane 50 is displaced relatively small downward.

  Subsequently, when the inner cylinder 12 moves largely upward relative to the outer cylinder 11 due to the reaction of the positive load described above, and the load weight (load on the rebound side) is input to the vibration isolator 10, The restriction passage 41 is clogged, and it becomes difficult for the liquid to flow from the sub liquid chamber 18 side to the main liquid chamber 17 side, and a negative pressure is input to the main liquid chamber 17. Since the membrane 50 is elastically deformed while the lower surface is separated from the fixed portion 42 of the restriction passage member 40, the membrane 50 is displaced relatively large upward. That is, when a large negative pressure is input to the main liquid chamber 17, first, the pressure receiving portion 51 of the membrane 50 is elastically deformed upward, and then the pressure receiving portion 51 of the membrane 50 is moved as shown in FIG. Further, the outer peripheral portion 52 of the membrane 50 is elastically deformed upward in the form of being pulled up by the pressure receiving portion 51, and the lower surface of the outer peripheral portion 52 of the membrane 50 is extended from the upper surface of the fixing portion 42 of the restriction passage member 40. Spaced apart. As a result, the pre-compression of the outer peripheral portion 52 of the membrane 50 by the pair of fixing portions 42 and 61 is released, and the outer peripheral portion 52 of the membrane 50 is pulled radially inward to increase the effective pressure receiving area of the membrane 50. 50 is further greatly displaced upward. As a result, expansion of the internal volume of the main liquid chamber 17 is suppressed, and a rapid decrease in the liquid pressure in the main liquid chamber 17 is prevented.

  Next, the effect of the above-described vibration isolator 10 will be described.

  According to the vibration isolator 10 having the above-described configuration, the displacement amount of the membrane 50 toward the main liquid chamber 17 side can be made larger than the displacement amount of the membrane 50 toward the sub liquid chamber 18 side. 17 can be prevented, and cavitation at the time of input of a large vibration can be prevented. Further, in the vibration isolator 10 described above, since it is not necessary to reduce the hardness of the membrane 50, liquid flows into the restriction passage 41 during shake vibration, and vibration is effectively damped by liquid column resonance in the restriction passage 41. Can be made.

  Further, in the above-described vibration isolator 10, since the outer peripheral portion 52 of the membrane 50 is fixed to the pressing plate 60, it is difficult for the membrane 50 to come off, and the liquid tightness at the outer edge portion of the membrane 50 can be improved. .

As mentioned above, although the embodiment of the vibration isolator according to the present invention has been described, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.
For example, in the above-described embodiment, the outer peripheral portion 52 of the membrane 50 is folded toward the main liquid chamber 17 side (upward), and the end of the outer peripheral portion 52 is the main liquid chamber 17 side (upward). ) And the lower surface of the outer peripheral portion 52 is in contact with the fixing portion 42 on the side of the auxiliary liquid chamber 18 so as to be separable, and the membrane 50 is greatly moved toward the main liquid chamber 17 when large vibration is input. In the present invention, the outer peripheral portion of the membrane 50 is folded back toward the sub liquid chamber 18 (downward), and the end of the outer peripheral portion is on the sub liquid chamber 18 side. It is also possible to adopt a configuration in which the upper surface of the outer peripheral portion is in contact with the fixing portion 62 on the main liquid chamber 17 side (upper side) so as to be separable. Thereby, when a large vibration is input to the vibration isolator 10 and a positive load is input to the vibration isolator, first, the pressure receiving portion 51 of the membrane 50 is displaced to the sub liquid chamber 18 side (downward), and then the membrane. The outer peripheral portion 52 of the 50 is elastically deformed downward while being pulled down by the pressure receiving portion 51, and the lower surface of the outer peripheral portion 52 of the membrane 50 is separated from the fixing portion 61 of the pressing plate 60. As a result, the effective pressure receiving area of the membrane 50 is increased, the membrane 50 is largely displaced toward the sub liquid chamber 18 side, and an increase in the liquid pressure in the main liquid chamber 17 is suppressed. Subsequently, when the load weight is input to the vibration isolator 10 due to the reaction of the positive load described above, the membrane 50 greatly displaced toward the auxiliary liquid chamber 18 returns to its original shape, and the membrane 50 further returns to the main liquid chamber 17 side. Displaces slightly. Thereby, a rapid decrease in the hydraulic pressure in the main liquid chamber 17 can be suppressed, and the occurrence of cavitation can be prevented.

  Further, in the above-described embodiment, the outer peripheral portion 52 of the membrane 50 has a substantially V-shaped bent shape in sectional view. However, in the present invention, the outer peripheral portion 52 of the membrane 50 is formed in another shape. May be. For example, the outer peripheral portion 52 of the membrane 50 may be formed in a substantially L shape in cross section.

Further, in the above-described embodiment, the fixing portions 42 and 61 are formed in an annular shape, but the present invention may be a fixing portion other than an annular shape. For example, a plurality of rectangular plate-like fixing portions are arranged around the periphery. The structure arrange | positioned intermittently in the direction may be sufficient.
Further, in the above-described embodiment, the holding member 70 is configured by the holding plate 60 forming the one fixing portion 61 and the restricting passage member 40 provided with the other fixing portion 42, but the present invention. It is also possible to use holding members having other configurations. For example, the holding member 70 may be configured by a single member (for example, the restriction passage member 40), and a pair of fixing portions may be formed on the member. Or the holding member 70 may be comprised by the 3 or more member, for example, the structure which each arrange | positioned the press plate which comprises a fixing | fixed part on the upper and lower surfaces of the restriction | limiting channel | path member 40 may be sufficient.

  In the above-described embodiment, the compression type vibration isolator 10 in which a positive pressure is applied to the main liquid chamber 17 when a support load is applied has been described. However, the main liquid chamber 17 is positioned on the lower side in the vertical direction. And it is applicable also to the suspension type vibration isolator which is attached so that the sub liquid chamber 18 may be located in the vertical direction upper side, and a negative pressure acts on the main liquid chamber 17 when a support load acts.

  In the above-described embodiment, the outer cylinder 11 is connected to the vehicle body (vibration receiving portion), and the inner cylinder 12 is connected to the engine (vibration generating portion). The inner cylinder 12 may be connected to the vehicle body (vibration receiving portion).

Further, the vibration isolator according to the present invention is not limited to the engine mount of the vehicle, but can be applied to the vibration isolator other than the engine mount. For example, the present invention can be applied to a mount of a generator mounted on a construction machine, or can be applied to a mount of a machine installed in a factory or the like.
In the above-described embodiment, the partition member 15 is provided with the restriction passage member 40 in which the restriction passage 41 is formed. However, in the present invention, even if the restriction passage 41 is formed in addition to the partition member 15. Good. For example, the restriction passage may be formed by grooving a part of the outer cylinder 11, or the restriction passage may be formed by grooving a part of a caulking portion such as the diaphragm ring 30.

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 Outer cylinder 12 Inner cylinder 13 Elastic body 15 Partition member 16 Liquid chamber 17 Main liquid chamber 18 Sub liquid chamber 41 Restriction passage 42 Fixing part 50 Membrane 52 Outer part 61 Fixing part 70 Holding member

Claims (1)

An outer cylinder connected to one of the vibration generating part and the vibration receiving part, and an inner cylinder connected to the other;
An elastic body that elastically connects the outer cylinder and the inner cylinder;
A partition member that divides the liquid chamber in the outer cylinder into a main liquid chamber on one side and a sub liquid chamber on the other side having the elastic body as a part of a wall surface;
A liquid-filled vibration isolator having a restriction passage communicating the main liquid chamber and the sub liquid chamber,
The partition member includes an elastically deformable membrane whose outer peripheral portion is folded back toward one side in the axial direction, and a holding member made of a rigid body that holds the outer peripheral portion of the membrane,
The holding member includes a pair of fixing portions that sandwich the outer peripheral portion of the membrane from the outer cylinder axial direction.
The outer peripheral part of the membrane is fixed to one fixed part arranged on one side in the axial direction of the pair of fixed parts, and the other fixed part arranged on the other side in the axial direction is attached to the other fixed part of the membrane. An anti-vibration device according to claim 1, wherein an outer peripheral portion is abutted so as to be separable, and an outer peripheral portion of the membrane is pre-compressed in an axial direction by the pair of fixing portions.

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