JP2004044772A - Liquid seal vibration-proof device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein when a lateral membrane for adjusting internal pressure is provided at side part of a main liquid chamber and deformation is restricted by a lateral membrane stopper, since high spring is hardly obtained in cases where the stopper is made of rubber, it becomes difficult that resonance efficiency is made high and when it is controlled by suction negative pressure of an engine, expensive material excellent in gasoline-resistance must be used, and to realize enhancement of resonance efficiency and reduction of cost by the stopper. <P>SOLUTION: An internal pressure control means provided on side part of the main chamber is constituted by the membrane 10 formed on side surface of elastic cylindrical member 8 constituted separately from elastic body 5 and inserted/fixed into the chamber 20 and the stopper 11 mounted to side surface wall of the chamber 20. In the stopper 11, stopper body and pipe 13 are integrally formed by resin and a mounting insert member 43 is insert-molded. A membrane operation chamber 15 formed between the membrane 10 and the stopper 11 is made to negative pressure by suction negative pressure. When the membrane 10 is adsorbed/restricted on the stopper 11, the stopper is not deformed because it is made of resin and it becomes high spring to enhance resonance efficiency so as to dispense with expensive material superior in antigasoline quality. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid-sealing vibration isolator such as an engine mount, and more particularly to a device provided with a movable film for controlling the internal pressure of a main liquid chamber.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2002-70931 discloses that an operating chamber is formed by providing a movable membrane continuous with an elastic main body on a side facing a main liquid chamber, and attaching a substantially funnel-shaped holder from the outside to form a negative pressure or opening to the atmosphere. It is disclosed that the movable film is made free or restricted to restrict the deformation by selectively switching the movable film. In addition, a rubber movable film stopper formed separately from the holder is provided in the holder, thereby restricting deformation of the movable film.
[0003]
[Problems to be solved by the invention]
By the way, the above-mentioned conventional movable film stopper is made of rubber, and allows elastic deformation even when the movable film comes into contact. However, in this case, even if it is desired to obtain a higher spring by preventing elastic deformation of the movable film with respect to a large vibration input, this cannot be realized. Therefore, it is desired that the movable film stopper is not elastically deformed and that the spring characteristic of the movable film can be made nonlinear in response to a large vibration input.
[0004]
Further, if the movable film stopper is made of rubber, the movable film stopper and the movable film come into contact with each other with rubber, which may cause abrasion deformation, and it has been desired to make such deformation less likely to occur. In addition, there is a possibility of deterioration due to heat or gasoline, and the shape may change due to long-term use, resulting in a change in spring characteristics. Therefore, improvement in durability has been desired. In addition, if the movable film stopper is formed separately from the holder, the number of constituent parts increases and the assembly becomes complicated. Therefore, it is desired to simplify the structure of the movable film stopper. Furthermore, if the movable membrane that requires a material with excellent gasoline resistance and the like is integrated with the elastic body, the entire elastic body must be made of an expensive special material. It is also desired to have separate parts.
The present application aims to fulfill these requirements.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a liquid seal vibration isolator according to claim 1 includes a first mounting member mounted on one of a vibration generating side and a vibration receiving side, a second mounting member mounted on the other side, A main liquid chamber having an elastic body member interposed between the main liquid chamber and the elastic body member as a part of a wall; and a sub liquid chamber partitioned by the main liquid chamber and a partition member and covered with a flexible membrane member. A liquid seal vibration isolator provided with an orifice passage communicating these two liquid chambers,
A movable film that faces the main liquid chamber and absorbs fluctuations in its internal pressure; a movable film stopper that regulates deformation of the movable film; and a free film that allows the movable film to freely elastically deform with respect to the movable film stopper. State, and an internal pressure control means for changing to a restricted state in which the movable film is brought into close contact with the movable film stopper,
The movable film stopper is made of a heat-resistant and gasoline-resistant resin material.
[0006]
According to a second aspect of the present invention, in the first aspect, the movable film is formed separately from the elastic main body, and is formed on a part of an elastic cylindrical member inserted and fixed into the main liquid chamber. .
[0007]
According to a third aspect, in the second aspect, the movable film and the movable film stopper each have a non-circular shape.
[0008]
【The invention's effect】
According to the first aspect, since the movable film stopper is made of a resin, the movable film stopper can be formed as a single member having no plural components, so that the structure can be simplified. In addition, since the elastic deformation of the movable film can be surely restricted without being deformed in the state where the movable film is in contact with the movable film, the spring characteristic of the movable film can be made significantly non-linear between the free state and the restricted state. In addition, since the contact with the movable film is no longer the contact between the rubber and the rubber, the wear is reduced, the durability is improved, the shape change is small, and the spring characteristics are stabilized. In addition, durability is improved due to excellent heat resistance and gasoline resistance.
[0009]
According to a second aspect of the present invention, since the movable film is formed separately from the elastic main body and formed as a part of the elastic cylindrical member inserted and fixed into the main liquid chamber, the formation of the movable film and the attachment to the main liquid chamber are facilitated. Moreover, it is sufficient if only the elastic cylinder member is made of a special material having high heat resistance and gasoline resistance, and the elastic main body can be made of the same material as the conventional one.
[0010]
At this time, even if the movable film is made non-circular as in claim 3, if a non-circular opening is formed in advance in a part of the insert member constituting the elastic cylindrical member, it can be easily formed by insert molding of the elastic member. Can be formed. The movable film stopper can also easily form a non-circular shape corresponding to the movable film by resin molding.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment configured as an engine mount will be described with reference to the drawings. FIG. 1 is a full sectional view of the engine mount (a sectional view taken along line 1-1 of FIG. 2), FIG. 2 is a plan view (shown by an arrow Z in FIG. 1), and FIG. 4 is a schematic perspective view of a stopper mounting portion, FIG. 5 is an enlarged sectional view of the stopper portion, and FIG. 6 is a diagram showing a modification of the stopper bracket.
[0012]
First, in FIG. 1, reference numeral 1 denotes a first mounting member mounted on the engine side by a protrusion 1a, 2 denotes a second mounting member mounted on the vehicle body side by a bolt or the like, 5 denotes an elastic body member, It has a substantially conical dome portion 6 made of an elastic member, and a leg portion 7 that forms an opening edge of the dome portion 6 continuously therewith. The leg 7 is in close contact with the upper part of the elastic tubular member 8.
[0013]
A flange member 3 and a cylindrical member 4 are fitted and integrated into and out of the upper half of the second mounting member 2, and an elastic cylindrical member 8 is fitted inside the cylindrical member 4. The horizontal membrane 10 is formed at a position corresponding to the mounting holes 9a and 9b formed in a part of the elastic cylindrical member 8 where the flange member 3 and the cylindrical member 4 of the second mounting member 2 overlap. The transverse film 10 corresponds to the movable film in the present invention.
[0014]
A transverse membrane stopper 11 is fitted in the mounting holes 9a and 9b. The transverse membrane stopper 11 is formed by integrally forming a stopper main body portion 12 and a pipe portion 13 fitted into the mounting holes 9a and 9b with a resin having excellent heat resistance and gasoline resistance such as polypropylene. The pipe section 13 is connected to the switching valve 14a.
[0015]
The switching valve 14a switches between opening to the atmosphere and connection to a negative pressure source such as an intake negative pressure of the engine, so that the diaphragm 10 is tightly fixed on the stopper body 12 and the diaphragm 10 is free. Selectively switch to any of the states that can be freely elastically deformed. The transverse film 10 and the transverse film stopper 11 are made of a material having excellent heat resistance and gasoline resistance, respectively.
[0016]
The lower end side opening of the elastic tubular member 8 is covered with the partition member 16. The partition member 16 has a structure in which three members, an upper partition 17, an intermediate partition 18, and a lower partition 19, are overlapped, and each member is formed of an appropriate rigid material such as a synthetic resin. The partition member 16 is provided with first and second orifice passages described later.
[0017]
A main liquid chamber 20 is formed between the partition member 16 and the elastic main body member 5 with the elastic main body member 5 as a part of a wall. On the opposite side of the partition member 16 from the main liquid chamber 20, a sub liquid chamber 22 covered with a diaphragm 21 is formed, and an incompressible liquid is sealed in the main liquid chamber 20 and the sub liquid chamber 22.
[0018]
Between the upper partition 17 and the intermediate partition 18 and between the intermediate partition 18 and the lower partition 19, there is formed a spiral orifice orifice passage 23 which is a first orifice passage. The other end communicates with a common passage 24 which is formed therebetween and opens to the main liquid chamber, and the other end communicates with the sub liquid chamber 22 through an opening 19 a formed in a part of the lower partition 19.
[0019]
The damping orifice passage 23 always communicates the main liquid chamber 20 and the sub liquid chamber 22, and generates and absorbs a damping force against relatively low frequency and large amplitude vibrations such as vibrations during normal driving. It has become.
[0020]
The common passage 24 simultaneously communicates with an idle orifice passage 25 which is a second orifice passage. The idle orifice passage 25 has a central hole 26 formed in the center of the upper partition 17, and an opening 27 correspondingly formed in the center of the intermediate partition 18 and an outlet formed in the center of the lower partition 19. It communicates with the auxiliary liquid chamber 22 through 28. The outlet 28 is opened and closed by a thick portion 21 a formed at the center of the diaphragm 21.
[0021]
The thick portion 21a opens and closes the outlet 28 that forms an opening on the side of the sub liquid chamber 22 of the idle orifice passage 25 by coming into contact with and separating from a sheet portion that is a peripheral portion of the outlet 28 in the lower partition 19. When the outlet 28 is opened, the main liquid chamber 20 and the sub liquid chamber 22 communicate with each other, and the vibration during idling is absorbed by the liquid column resonance on the high frequency side of the damping orifice passage 23.
[0022]
The opening / closing operation of the thick portion 21a is performed by a separate opening / closing member 30. The opening / closing member 30 is fitted with an upper part 32 made of an elastic body having a central projection 31 for pushing up the thick part 21a and a resin bottom part 33, and sealed so as to form a hollow opening / closing part working chamber 34 therebetween. The central projection 31 is pressed against the thick portion 21 a by a return spring 35 disposed in the opening / closing section working chamber 34, and the thick portion 21 a is urged upward so as to be in close contact with the periphery of the outlet 28.
[0023]
A pipe portion 36 formed at the center of the bottom member 33 is connected to the switching valve 14b, and switches between the open-to-atmosphere state and the negative pressure state. At this time, when switching the opening / closing member 30 and the transverse membrane 10 in synchronization with each other, the switching valves 14a and 14b can be shared.
[0024]
When the inside of the opening / closing section working chamber 34 is brought into a negative pressure state, the central projection 31 of the opening / closing member 30 is pulled downward in the drawing against the return spring 35, and as a result, the thick portion 21a is separated from the periphery of the outlet 28 and 28 is opened to allow the idle orifice passage 25 to communicate with the main liquid chamber 20 and the sub liquid chamber 22. Conversely, when the air is released to the atmosphere, the central projection 31 is pushed up by the return spring 35, and the thick portion 21a closes the outlet 28.
[0025]
The opening / closing member 30 is integrated by overlapping the outer peripheral portions of the upper portion 32 and the bottom member 33 and caulking the entire periphery with a ring member 37, and the ring member 37 is fixed to the lower inside of the lower cylindrical member 38. . The lower cylindrical member 38 is a metal member that forms the lower half of the second mounting member 2, and is integrated by caulking its upper end with the lower end of the tubular member 4. At this time, the lower end portion of the elastic tubular member 8 and the upper flange 21c of the insert ring 21b integrated with the outer peripheral portion of the diaphragm 21 are clamped and fixed to the caulking portion 4b at the same time.
[0026]
Further, at the time of caulking between the tubular member 4 and the lower cylindrical member 38, the elastic tubular member 8 and the partition member 16 are also fixed at the same time. That is, the leg 7 presses against the upper end of the elastic tubular member 8, the lower end contacts the upper surface of the outer peripheral portion of the upper partition 17 of the partition member 16, and the lower end of the outer peripheral portion of the lower partition 19 of the partition member 16 is inserted. Since it is supported by the lower flange 21d of the ring 21b, it is eventually sandwiched and fixed between the leg 7 and the lower flange 21d.
[0027]
As shown in FIGS. 2 and 4, an overhang portion 40 is provided on an upper portion of the flange member 3 so that a part of a flange 3 b formed by being bent outward is projected in a radial direction. As shown in FIG. 2, the overhang portions 40 are provided at two positions approximately 60 ° to the left and right across the line L connecting the center O and the pipe portion 13, as seen in FIG. The transverse membrane stopper 11 is directly fixed to the rivets 41, 40.
[0028]
The projecting portion 40 is formed to project from the outer peripheral portion of the original flange 3 b of the flange member 3, and is located inside the flange 38 a of the lower cylindrical member 38. That is, it is formed at a position retracted from the flange 38a so as to avoid an increase in the size of the device. A line M connecting the outsides of the left and right overhangs 40, 40 is substantially straight, and passes through a position on the line L, which is approximately the same as the end of the flange 3b that is the maximum overhang. In addition, the intervals between the overhang portions 40, 40 and the rivets 41, 41 are arbitrary, and are set according to the size of the transverse membrane stopper 11.
[0029]
As shown in FIGS. 3 and 4, the transverse membrane stopper 11 is disposed below the flange 3 b so as to extend along the periphery of the body 3 a of the flange member 3, and the rivets 41, 41 are used in the vertical direction of FIG. It is fixed in a direction parallel to the input direction Z. 4 shows a state before the elastic body member 5 (FIG. 1) is integrated with the flange member 3 and a state before the cylindrical member 4 is connected to the lower cylindrical member 38 (FIG. 1).
[0030]
As is clear from FIG. 4, the horizontal membrane stopper 11 is formed in a substantially arc shape and is formed long in the circumferential direction of the body 3 a (hereinafter, this shape is referred to as “horizontally long”), and the mounting holes provided in the overhanging portions 40, 40. The mounting holes 45, 45 provided in the flange 44 formed in the insert member 43 of the transverse membrane stopper 11 are aligned with each other and are fixed by rivets. The mounting holes 9a and 9b formed in the body portions 3a and 4a are also formed to be horizontally long corresponding to the horizontal membrane stoppers 11.
[0031]
As shown in FIG. 5, the insert member 43 is a metal member having a substantially L-shaped cross section. Are formed continuously and integrally with the flange 44. The insert member 43 is not limited to a metal material and may be a suitable resin material as long as it has a certain degree of rigidity and durability.
[0032]
The lower half of the main body 46 is inserted into the stopper main body 12 and is integrated when the transverse membrane stopper 11 is formed by injection molding or the like. A hole 47 is formed at the lower side of the insert member 43, and the hole 47 strengthens the connection with the stopper body 12, and a ventilation hole 48 is formed through the center of the hole 47. The ventilation hole 48 passes through the central portion of the stopper body 12 through the axis of the pipe 13 and communicates with the transverse membrane working chamber 15.
[0033]
The upper end of the stopper main body 12 fits into the mounting holes 9a and 9b, and the lower end extends only below the lower end of the body 3a and fits only into the mounting hole 9b.
The outermost projection 51 is formed on the surface of the stopper body 12 facing the horizontal membrane working chamber 15, and a large number of projections 52 are formed integrally with the outermost projection 51. A large number of the projections 52 are arranged in a dot shape so as to surround the sheet surface 53 in a ring shape. However, instead of the projection 52, a continuous ring-shaped projection may be formed. One end of a ventilation hole 48 is opened in the seat surface 53.
[0034]
The outermost projection 51 forms a seal that is constantly pressed against the periphery of the lateral membrane 10. However, conversely, the seal protrusion can be made to protrude from the lateral film 10 side. The projections 52 define the outer periphery of the seat surface 53, and the diaphragm 10 is subjected to a stepwise elastic deformation so as to first come into contact with the projections 52 and then to the seat surface 53 when the diaphragm 10 elastically deforms. The ten springs are changed in three stages of a free state, at the time of contact with the projection 52, and at the time of contact with the seat surface 53, to generate a non-linear spring characteristic.
[0035]
A substantially cylindrical insert member 54 is integrally formed with the elastic cylindrical member 8 as a metal core. At positions corresponding to the mounting holes 9a and 9b of the insert member 54, a horizontal hole 55 having the same shape is formed, and a part of the elastic cylindrical member 8 covering the horizontal hole 55 is the horizontal membrane 10. The edge of the horizontal hole 55 is located at a position close to the outermost peripheral projection 51.
[0036]
The elastic cylindrical member 8 is made of an elastic material having excellent heat resistance and gasoline resistance, for example, hydrin rubber, silicon rubber, fluorine rubber, or the like. The non-circular transverse film 10 can be easily formed.
[0037]
The upper part of the insert member 54 forms an inward flange 56 and the lower part forms an outward flange 57. The elastic member of the elastic cylindrical member 8 is also integrally formed around the flange 56 to form an elastic receiving portion 8a, and the leg 7 of the elastic main body 5 is pressed against and adheres to the elastic receiving portion 8a. The joint with the portion 8a is sealed. Note that seal projections 8b and 7a are provided from both members.
[0038]
The lower end 8c of the elastic tubular member 8 is in close contact with the vicinity of the mounting hole 9b in the main body 4a of the tubular member 4 to seal the space between the tubular member 4 and the elastic tubular member 8, and the outer peripheral surface of the upper partition 17 Close to. At this time, the seal projection 8d integrally formed ensures sealing. The stopper body also has a seal projection 8e at the lower end 8c at the contact portion with the lower portion.
[0039]
The outer peripheral portion of the flange 57 overlaps with the upper end flange of the lower cylindrical member 38 and the upper flange 21c of the insert ring 21b, and is caulked and integrated by the caulking portion 4b provided on the flange portion of the tubular member 4.
[0040]
Next, the operation of the present embodiment will be described. First, if the ventilation hole 48 of the pipe portion 13 is opened to the atmosphere to make the elastic deformation of the horizontal membrane 10 free, the horizontal membrane 10 responds to the fluctuation of the internal pressure of the main liquid chamber 20 by the minute vibration input from the first mounting member 1. And elastically deforms freely to absorb changes in the internal pressure of the main liquid chamber 20. Therefore, the whole becomes a low dynamic spring.
[0041]
If there is a larger vibration input, the diaphragm 10 comes into contact with the seat surface 53 and the elastic deformation thereof is regulated, so that the spring of the diaphragm 10 becomes high, and the diaphragm 10 is caused by such a large vibration. Excessive deformation can be prevented to prevent breakage, and the durability of the transverse membrane 10 can be improved.
[0042]
Therefore, a low spring is used for a small vibration input, and a high spring is used for a larger vibration input. Therefore, the spring constant is changed in a non-linear and wide range to change the internal pressure in the main liquid chamber 20. Absorbing the rise, more ideal vibration absorption becomes possible.
[0043]
Further, if the ventilation hole 48 of the pipe portion 13 is connected to a negative pressure source by the switching valve 14a, the diaphragm working chamber 15 becomes a negative pressure, so that the diaphragm 10 adheres to the seat surface 53 and elastic deformation is restricted. Is done. In this state, if there is a vibration input near the resonance frequency of the damping orifice passage 23 or the idle orifice passage 25, since the elastic deformation of the transverse membrane 10 is regulated, the amount of liquid flow to each orifice passage can be increased, and as a result, Thus, the liquid column resonance efficiency in these orifice passages can be increased. In addition, the restraint of the transverse membrane 10 can also be performed only on one of the damping orifice passage 23 and the idle orifice passage 25.
[0044]
At this time, by providing the projection 52, a gap is secured between the horizontal film 10 and the sheet surface 53, and the horizontal film 10 and the outermost peripheral projection 51 are located near the outer peripheral side projection 51 via the concave portion formed between the adjacent projections 52. Since the gap formed between the inner wall and the central portion of the diaphragm working chamber 15 where the ventilation hole 48 is opened can be kept in communication with each other, the occurrence of air pockets at the corners of the diaphragm working chamber 15 is prevented. In addition, it is possible to prevent a change in the capacity of the diaphragm working chamber 15 due to an increase in the temperature of the engine room, thereby preventing a change in the film rigidity of the diaphragm 10. However, when the influence of the generation of the air pool is small, the protrusion 52 may be formed as a loop-shaped ridge that continuously surrounds the periphery of the opening of the ventilation hole 48 instead of the point-like shape.
[0045]
Since the diaphragm 10 in this embodiment uses a part of the elastic tubular member 8 inserted and fixed into the main liquid chamber 20, it is easy to mold even a complicated shape such as a non-circular shape. In addition, both the mounting property and the sealing property are excellent. In addition, since the elastic tubular member 8 is formed separately from the elastic main body 5, only the elastic tubular member 8 can be made excellent in heat resistance and gasoline resistance. Therefore, overall cost can be reduced and durability can be improved.
[0046]
In addition, the elastic body portion 5 and the elastic tubular member 8 are brought into close contact with the seals 7a and 8b, and the upper partition 17 and the elastic tubular member 8 are brought into close contact with the seal projection 8d. . In addition, since a part of the diaphragm stopper 12 is adhered to the diaphragm 10, the elasticity of the diaphragm 10 can be used to tightly seal the gap between the diaphragm stopper 12 and the diaphragm working chamber 15 as a result. Can be sealed securely.
[0047]
Further, since the transverse membrane stopper 11 can be fixed only by directly attaching the flange 44 of the insert member 43 to the overhanging portion 40 formed on the flange 3b of the flange member 3 by the rivets 41, 41, a special mounting seat is provided. Need not be provided by welding, mounting is easy, and assembling accuracy is increased by the amount of no welding. Moreover, since the insert member 43 has a substantially L-shape and a semicircular shape, the rigidity is increased, the degree of deformation is increased, and the rivets 41 can be fixed at only two places.
[0048]
In addition, as shown in FIG. 6, the insert member 43 is further inclined by θ from the state where the cross section is bent at approximately 90 ° to form an obtuse angle, and is deformed to approximately 90 ° at the time of mounting, and is further improved in adhesion. Become. Conversely, the same effect can be obtained if the main body 4a of the tubular member 4 is inclined so that the lower part projects outward. In any case, it is sufficient to fix only the rivets 41 and 41 only.
[0049]
Further, since the stopper body portion 12 and the pipe portion 13 are formed integrally with the transverse membrane stopper 11 in a state where the insert member 43 is inserted, it is not necessary to combine a plurality of members at the time of assembling as in the related art, and the number of parts can be reduced, and the structure can be reduced. And manufacturing is simplified.
[0050]
In addition, since the diaphragm stopper 11 is made of a resin having excellent heat resistance and gasoline resistance, it does not deform in a state where the diaphragm 10 is in contact with the stopper, so that elastic deformation of the diaphragm 10 can be surely regulated. The spring characteristic of the movable film can be made significantly non-linear between the free state and the restricted state. In addition, since the contact with the lateral membrane 10 is no longer the contact between the rubber and the rubber, the abrasion is reduced, the durability is improved, the shape change is small, and the spring characteristics are stabilized. In addition, durability is improved due to excellent heat resistance and gasoline resistance.
[0051]
The invention of the present application is not limited to the above-described embodiment, and can be variously modified. For example, the invention can be applied to various anti-vibration devices other than the engine mount.
[Brief description of the drawings]
FIG. 1 is an entire cross-sectional view of an engine mount according to an embodiment (a cross-sectional view taken along line 1-1 of FIG. 2).
2 is a view in the direction of the arrow Z in FIG. 1; FIG. 3 is a view in the direction of the arrow X in FIG. 1; FIG. 4 is a perspective view showing the mounting of the diaphragm stopper; FIG. 6 is a view showing another embodiment of the insert member.
1: first mounting member, 2: second mounting member, 5: elastic body member, 8: elastic cylindrical member, 9a. 9b: mounting hole, 10: diaphragm, 11: diaphragm stopper, 12: stopper body, 13: pipe, 15: diaphragm working chamber, 16: partition member, 20: main liquid chamber, 21: diaphragm, 22 : Sub liquid chamber, 23: damping orifice passage, 24: common passage, 25: idle orifice passage, 40: overhang, 41: rivet, 43: insert member, 44: flange

Claims (3)

A first attachment member attached to one of the vibration generating side and the vibration receiving side, a second attachment member attached to the other side, and an elastic body member interposed therebetween; A liquid sealing device including a main liquid chamber as a part of a wall, a sub liquid chamber partitioned by the main liquid chamber and a partition member, and covered by a flexible membrane member, and an orifice passage communicating the two liquid chambers. In the vibration device,
A movable film that faces the main liquid chamber and absorbs fluctuations in its internal pressure; a movable film stopper that regulates deformation of the movable film; and a free film that allows the movable film to freely elastically deform with respect to the movable film stopper. State, and an internal pressure control means for changing to a restricted state in which the movable film is brought into close contact with the movable film stopper,
A liquid seal vibration isolator, wherein the movable film stopper is made of a heat-resistant and gasoline-resistant resin material. 2. The liquid ring vibration isolator according to claim 1, wherein the movable film is formed separately from the elastic main body and is formed on a part of an elastic cylindrical member inserted and fixed into the main liquid chamber. apparatus. The liquid ring vibration isolator according to claim 2, wherein the movable film and the movable film stopper each have a non-circular shape.

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