JP4137556B2 - Liquid seal vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid seal 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 Laid-Open No. 2002-70931 provides a movable membrane continuous with the elastic main body member on the side facing the main liquid chamber, and a working chamber is formed by attaching a substantially funnel-shaped holder from the outside, so that negative pressure or open to the atmosphere It is disclosed that the movable film is made free or constrained by restricting deformation to restrict deformation. 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 conventional movable film stopper is made of rubber, and allows elastic deformation even when the movable film contacts. However, if this is done, even if it is desired to obtain a higher spring by preventing elastic deformation of the movable film against a large vibration input, this cannot be realized. Therefore, it is desired that the movable film stopper does not elastically deform with respect to a large vibration input and that the spring characteristic of the movable film can be made nonlinear.
[0004]
In addition, when the movable film stopper is rubber, the movable film stopper and the movable film are in contact with each other with rubber, which may cause wear deformation, and it has also been desired to make such deformation difficult to occur. In addition, there is a possibility of deterioration due to heat and gasoline, and there is a possibility that the shape will change due to long-term use, resulting in a change in spring characteristics. Further, when the movable film stopper is formed separately from the holder, the number of components is increased and the assembly becomes complicated. Therefore, it is also desired to simplify the structure of the movable film stopper. Further, when the movable membrane is required material having excellent gasoline resistance, etc. is integral with the elastic body member, it means that must constitute the entire elastic body member in expensive special materials, the movable film and the elastic body It is also desired to separate the members .
The present application aims to realize 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 attachment member attached to either the vibration generating side or the vibration receiving side, a second attachment member attached to the other side, and these A main liquid chamber having the elastic main body member as a part of a wall, a sub liquid chamber partitioned by the main liquid chamber and a partition member and covered with a flexible membrane member, In a liquid seal vibration isolator provided with an orifice passage communicating these both liquid chambers,
An elastic cylinder member provided between the elastic main body member and the partition member and surrounding the main liquid chamber;
A cylindrical member surrounding the elastic cylindrical member;
Formed in a part of the elastic cylindrical member by a hole provided in a part of a cylindrical insert member integrally formed as a core metal fitting on the elastic member of the elastic cylindrical member, and the internal pressure fluctuations facing the main liquid chamber A movable film that absorbs the movable film, a movable film stopper that regulates deformation of the movable film, a free state that allows elastic deformation of the movable film with respect to the movable film stopper, and a movable film stopper An internal pressure control means for changing to a restrained state in which the movable film is closely attached, and
The movable film and the movable film stopper are each composed of heat resistance and gasoline resistance materials form a non-circular,
The movable film stopper is fitted into a mounting hole provided in the cylindrical member corresponding to the movable film, and the periphery thereof is tightly sealed to the movable film .
[0006]
A second aspect of the present invention provides the outermost peripheral projection according to the first aspect, wherein the outermost-side protrusion protrudes from the surface facing the working chamber formed between the movable films and is always pressed against the peripheral portion of the movable film to form a seal portion. And a seal surface surrounded by the protrusion, and a space is formed between the protrusion and the outermost peripheral protrusion, and the space and the space on the seal surface side are It is characterized in that it communicates with a protrusion interposed therebetween .
[0007]
According to a third aspect of the present invention , in the second aspect , the sheet surface has a curved surface with a central portion projecting toward the movable film, and one end of a vent hole leading to the working chamber is opened at the central portion. Features.
[0008]
【The invention's effect】
According to the first aspect, since the movable film stopper is made of resin, the movable film stopper can be formed as a single member not having a plurality of components, so that the structure can be simplified. In addition, since the elastic deformation of the movable film can be reliably regulated without being deformed when the movable film is in contact, the spring characteristics of the movable film can be remarkably nonlinear between the free state and the restricted state. Moreover, since the contact with the movable film is not 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 because of excellent heat resistance and gasoline resistance.
[0009]
In addition, since the movable membrane is formed separately from the elastic main body member and formed on a part of the elastic cylinder member inserted and fixed in the main liquid chamber, the movable membrane can be easily formed and attached to the main liquid chamber. It is sufficient that only the elastic cylindrical member is made of a special material having high heat resistance and gasoline resistance, and the elastic main body member can be kept as in the conventional material.
[0010]
In this case, even if the variable Domaku noncircular, be previously formed non-circular opening in a part of the insert member constituting the elastic tube member can be easily formed by insert molding of the elastic member. Also, the movable film stopper can be easily formed into a non-circular shape corresponding to the movable film by resin molding.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment configured as an engine mount will be described with reference to the drawings. 1 is a full sectional view of the engine mount (cross-sectional view taken along line 1-1 in FIG. 2), FIG. 2 is a plan view (indicated by arrow Z in FIG. 1), and FIG. 3 is a side view (indicated by arrow X in FIG. 1). 4 is a schematic perspective view of the stopper mounting portion, FIG. 5 is an enlarged sectional view of the stopper portion, and FIG. 6 is a view showing a modification of the stopper bracket.
[0012]
First, in FIG. 1, reference numeral 1 denotes a first attachment member attached to the engine side by a protrusion 1a, 2 denotes a second attachment member attached to the vehicle body side by a bolt or the like, 5 denotes an elastic body member, and rubber or the like is appropriately selected. It is made of an elastic member, and has a substantially conical dome portion 6 and a leg portion 7 continuously forming the opening edge of the dome portion 6. The leg 7 is in close contact with the upper part of the elastic cylinder member 8.
[0013]
On the upper half side of the second mounting member 2, the flange member 3 and the cylindrical member 4 are fitted and integrated inside and outside, and an elastic cylindrical member 8 is fitted inside the cylindrical member 4. A lateral membrane 10 is formed at a position corresponding to 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, 9b. The transverse membrane stopper 11 is formed by integrally forming a stopper main body portion 12 and a pipe portion 13 which are fitted into the mounting holes 9a and 9b, with a resin having excellent heat resistance and gasoline resistance such as polypropylene. The pipe part 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 the intake negative pressure of the engine, so that the lateral membrane 10 is tightly fixed on the stopper body 12 and the lateral membrane 10 is free. Select and switch to one of the freely elastically deformable states. The lateral membrane 10 and the lateral membrane stopper 11 are made of materials having excellent heat resistance and gasoline resistance, respectively.
[0016]
The opening on the lower end side of the elastic cylinder member 8 is covered with a partition member 16. The partition member 16 has a structure in which three members of 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 which will be described later.
[0017]
A main liquid chamber 20 having the elastic main body member 5 as a part of a wall is formed between the partition member 16 and the elastic main body member 5. 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]
A damping orifice passage 23 that is a spiral first orifice passage is formed between the upper partition 17 and the intermediate partition 18 and between the intermediate partition 18 and the lower partition 19. The other end communicates with the common liquid chamber 24 that 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 with the main liquid chamber 20 and the sub liquid chamber 22, and generates a damping force and absorbs a vibration having a relatively low frequency and a large amplitude such as vibration during general traveling. It is like that.
[0020]
The common passage 24 also communicates with an idle orifice passage 25 that is a second orifice passage. The idle orifice passage 25 has a central hole 26 formed at the center of the upper partition 17, and an outlet 27 corresponding to the opening 27 formed at the center of the intermediate partition 18 and the center of the lower partition 19. 28 to the auxiliary liquid chamber 22. The outlet 28 is opened and closed by a thick portion 21 a formed at the center of the diaphragm 21.
[0021]
The thick wall portion 21 a opens and closes the outlet 28 that forms the secondary liquid chamber 22 side opening of the idle orifice passage 25 by coming into contact with and separating from the seat portion that is the 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 vibration during idling is absorbed by liquid column resonance on the higher frequency side than 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 sealed so as to form a hollow opening / closing part working chamber 34 between the upper part 32 made of an elastic body having a central protrusion 31 for pushing up the thick part 21a and the resin bottom part 33, The center protrusion 31 is pressed against the thick part 21 a by the return spring 35 disposed in the opening / closing part working chamber 34, and urged toward the push-up side so that the thick part 21 a is in close contact with the periphery of the outlet 28.
[0023]
The pipe part 36 formed in the center part of the bottom member 33 is connected to the switching valve 14b, and switches between the atmospheric release state and the negative pressure state. At this time, when the opening / closing member 30 and the transverse membrane 10 are switched synchronously, the switching valves 14a and 14b can be shared.
[0024]
When the inside of the opening / closing part working chamber 34 is brought into a negative pressure state, the central protrusion 31 of the opening / closing member 30 is pulled downward against the return spring 35, and as a result, the thick part 21 a is separated from the periphery of the outlet 28, and the outlet 28 is opened, and the idle orifice passage 25 is communicated with the main liquid chamber 20 and the sub liquid chamber 22. On the contrary, if the atmosphere is released, the central protrusion 31 is pushed up by the return spring 35, and the thick portion 21 a 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 inner side of the lower cylindrical member 38. . The lower cylindrical member 38 is a metal member that forms the lower half side of the second mounting member 2, and is integrated by caulking the upper end portion thereof with the lower end portion of the tubular member 4. At this time, the lower flange portion of the elastic cylinder member 8 and the upper flange 21c of the insert ring 21b integrated with the outer peripheral portion of the diaphragm 21 are respectively sandwiched and fixed to the crimping portion 4b.
[0026]
Further, when the cylindrical member 4 and the lower cylindrical member 38 are caulked, the elastic cylindrical member 8 and the partition member 16 are also fixed at the same time. In other words, the elastic cylinder member 8 has the leg portion 7 in pressure contact with the upper end portion, the lower end portion comes into contact with 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 the insert. Since it is supported by the lower flange 21d of the ring 21b, it is eventually sandwiched and fixed between the leg portion 7 and the lower flange 21d.
[0027]
As shown in FIGS. 2 and 4, a protruding portion 40 is provided by projecting a part of the flange 3 b formed by bending outward at the upper portion of the flange member 3 in the radial direction. As shown in FIG. 2, the overhanging portions 40 are provided at two positions opened approximately 60 ° to the left and right across a line L connecting the center O and the pipe portion 13 in plan view in the illustrated state. The transverse membrane stopper 11 is directly fixed to 40 and 40 by rivets 41 and 41.
[0028]
The projecting portion 40 is formed so as 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 that is retracted from the flange 38a so as to avoid an increase in the size of the apparatus. A line M connecting the outer sides of the left and right projecting portions 40, 40 is substantially linear, and passes through a position on the line L that is the same as the tip portion that is the maximum projecting portion of the flange 3b. Further, the interval between the overhang portions 40 and 40 and the rivets 41 and 41 is arbitrary, and is set according to the size of the lateral membrane stopper 11.
[0029]
As shown in FIGS. 3 and 4, the transverse membrane stopper 11 is disposed below the flange 3 b along the periphery of the body portion 3 a of the flange member 3, and the rivets 41, 41 cause the vibration in the vertical direction, that is, the main vibration. It is fixed in a direction parallel to the input direction Z. 4 is shown in a state before the elastic main body member 5 (FIG. 1) is integrated, and the cylindrical member 4 is shown in a state before being joined to the lower cylindrical member 38 (FIG. 1).
[0030]
As is apparent from FIG. 4, the transverse membrane stopper 11 has a substantially arc shape and is long in the circumferential direction of the body portion 3 a (hereinafter, this shape is referred to as a horizontally long shape), and mounting holes provided in the overhang portions 40 and 40. 42 and 42 and the mounting holes 45 and 45 provided in the flange 44 formed in the insert member 43 of the transverse membrane stopper 11 are made to coincide with each other and fixed with rivets. The mounting holes 9 a and 9 b formed in the body portions 3 a and 4 a are also formed in a horizontally long shape corresponding to the transverse film stopper 11.
[0031]
As shown in FIG. 5, the insert member 43 is a metal member having a substantially L-shaped cross section, and is bent outwardly by approximately 90 ° at the main body portion 46 along the outside of the body portion 3 a and the upper portion thereof, and the overhang portion 40. And a flange 44 extending along the line. The insert member 43 is not limited to a metal material and may be an appropriate 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 on the lower side of the insert member 43, and the hole 47 strengthens the connection with the stopper main body 12, and a vent hole 48 is formed through the center of the hole 47. The vent hole 48 passes through the axial center portion of the pipe portion 13 and penetrates the central portion of the stopper main body portion 12 to communicate with the lateral membrane working chamber 15.
[0033]
The stopper main body 12 has an upper end that fits into the mounting holes 9a and 9b, and a lower end that extends downward from the lower end of the body 3a, so that it fits only into the mounting hole 9b.
An outermost peripheral projection 51 is integrally formed on the surface of the stopper main body 12 facing the transverse membrane working chamber 15, and a number of projections 52 are integrally formed on the inner side. A large number of protrusions 52 are arranged in a dot shape so as to surround the sheet surface 53 in a ring shape as a whole. However, instead of the protrusion 52, a continuous ring-shaped protrusion may be formed. One end of a vent hole 48 is opened in the seat surface 53.
[0034]
The outermost peripheral protrusion 51 forms a seal portion that is always pressed against the peripheral portion of the lateral membrane 10. However, conversely, the seal protrusion can be projected from the lateral membrane 10 side. The protrusion 52 defines the outer periphery of the sheet surface 53, and the diaphragm 10 is subjected to stepwise elastic deformation so that the diaphragm 10 first contacts the protrusion 52 when elastically deformed, and then contacts the sheet surface 53. The ten springs are changed in three stages, ie, in a free state, when in contact with the protrusion 52 and when in contact with the seat surface 53, thereby generating a non-linear spring characteristic.
[0035]
A substantially cylindrical insert member 54 is integrally formed on the elastic cylinder member 8 as a core metal fitting. At positions corresponding to the mounting holes 9 a and 9 b of the insert member 54, a horizontal hole 55 having the same shape as these is formed, and a part of the elastic cylindrical member 8 covering the horizontal hole 55 is the lateral membrane 10. The edge of the horizontal hole 55 is located in the vicinity of the outermost peripheral protrusion 51.
[0036]
The elastic cylinder member 8 is made of an elastic material excellent in heat resistance and gasoline resistance, for example, hydrin rubber, silicon rubber, fluororubber, and the like, and is formed integrally with the insert member 54 to correspond to the horizontally long shape of the lateral membrane stopper 11. The non-circular transverse membrane 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 cylinder member 8 is also integrally formed around the flange 56 to form an elastic receiving portion 8a, and the leg portion 7 of the elastic main body member 5 is pressed and brought into close contact therewith, thereby elastically receiving the leg portion 7 and the elastic receiving portion 8a. The joint part with the part 8a is sealed. Seal protrusions 8b and 7a are provided from both members.
[0038]
The lower end portion 8c of the elastic cylindrical member 8 is in close contact with the vicinity of the mounting hole 9b in the main body portion 4a of the cylindrical member 4 to seal between the cylindrical member 4 and the elastic cylindrical member 8, and the upper surface of the outer peripheral portion of the upper partition 17 Close to. At this time, the integrally formed seal protrusion 8d ensures the seal. Further, the stopper main body portion is provided with a seal projection 8e at the lower end portion 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 crimped and integrated by a crimping portion 4b provided on the flange portion of the tubular member 4.
[0040]
Next, the operation of this embodiment will be described. First, if the vent hole 48 of the pipe portion 13 is opened to the atmosphere to make the elastic deformation of the lateral membrane 10 free, the lateral membrane 10 responds to the fluctuation in the internal pressure of the main liquid chamber 20 by the minute vibration input from the first mounting member 1. It is elastically deformed freely and absorbs changes in the internal pressure of the main liquid chamber 20. Therefore, the whole becomes a low dynamic spring.
[0041]
When there is a greater vibration input, the lateral membrane 10 comes into contact with the seat surface 53 and its elastic deformation is restricted, so that the spring of the lateral membrane 10 becomes higher, and the lateral membrane 10 due to such large vibrations becomes higher. Excessive deformation can be prevented to prevent breakage, and durability of the transverse membrane 10 can be improved.
[0042]
Accordingly, a low spring is applied to a small vibration input, and a corresponding high spring that rises nonlinearly corresponding to a larger vibration input. Therefore, the internal pressure in the main liquid chamber 20 is changed by changing the spring constant in a non-linear manner over a wide range. Absorbs the rise and enables more ideal vibration absorption.
[0043]
Further, if the vent hole 48 of the pipe portion 13 is connected to the negative pressure source by the switching valve 14a, the lateral membrane working chamber 15 becomes negative pressure, so that the lateral membrane 10 is in close contact with the seat surface 53 and elastic deformation is restricted. Is done. In this state, if there is a vibration input in the vicinity of the resonance frequency of the damping orifice passage 23 or the idle orifice passage 25, the elastic deformation of the transverse membrane 10 is restricted, so that the amount of liquid flow with respect to each orifice passage can be increased. The liquid column resonance efficiency in these orifice passages can be increased. The lateral membrane 10 can be restrained only for either the damping orifice passage 23 or the idle orifice passage 25.
[0044]
At this time, by providing the protrusion 52, a gap is secured between the lateral film 10 and the sheet surface 53, and the lateral film 10 and the vicinity of the outermost peripheral projection 51 are located through a recess formed between the adjacent protrusions 52. Since the gap formed between the central portion and the central portion where the vent hole 48 of the lateral membrane working chamber 15 is opened can be kept in communication, the accumulation of air at the corner of the lateral membrane working chamber 15 is prevented. It is possible to prevent a change in the membrane rigidity of the transverse membrane 10 by preventing a change in the capacity of the transverse membrane working chamber 15 due to a high temperature in the engine room. However, in the case where there is little influence due to the occurrence of air pockets, the protrusions 52 may not be punctiform but may be loop-like ridges that continuously surround the opening of the vent hole 48.
[0045]
The transverse membrane 10 in the present embodiment uses a part of the elastic cylindrical member 8 inserted and fixed into the main liquid chamber 20, so that it can be easily molded even if it has a complicated shape such as a non-circular shape. Moreover, both the mountability and the sealability are excellent. Further, since the elastic cylindrical member 8 is configured separately from the elastic main body member 5, only the elastic cylindrical member 8 can be made excellent in heat resistance and gasoline resistance, and the elastic main body member 5 is not an expensive material but a normal one. Since it can be made into a thing, the cost as a whole can be reduced and durability can be improved.
[0046]
In addition, by sealing the elastic body member 5 and the elastic cylinder member 8 with the seals 7a and 8b and the upper partition 17 and the elastic cylinder member 8 with the seal protrusion 8d, the sealing performance at these joints can be ensured. . In addition, since a part of the lateral membrane stopper 12 is brought into close contact with the lateral membrane 10, the elasticity of the lateral membrane 10 can be used to tightly seal the lateral membrane stopper 12, and as a result, the lateral membrane working chamber 15 is formed. Can be sealed reliably.
[0047]
Further, the transverse membrane stopper 11 can be fixed by simply attaching the flange 44 of the insert member 43 by the rivets 41 and 41 corresponding to the overhanging portion 40 formed on the flange 3b of the flange member 3, so that a special mounting seat is provided. Is not required to be provided by welding, mounting is easy, and assembling accuracy is increased by the amount not welded. In addition, since the insert member 43 is substantially L-shaped and has a semicircular arc shape, the rigidity is increased and the degree of deformation is increased, and the rivets 41 and 41 can be fixed at only two locations.
[0048]
In addition, as shown in FIG. 6, if the insert member 43 is tilted by θ more than the state where the cross section is bent by approximately 90 ° to make it an obtuse angle, and deformed to approximately 90 ° at the time of mounting, the adhesion is further improved. Become. On the contrary, if the main body 4a of the tubular member 4 is inclined so that the lower part projects outward, the same effect can be obtained. In any case, it is only necessary to fix the rivets 41 and 41 at only two locations.
[0049]
Further, since the stopper main body portion 12 and the pipe portion 13 are integrally formed in the state in which the insert member 43 is inserted in the lateral membrane stopper 11, it is not necessary to combine a plurality of members at the time of assembly as in the prior art, and the number of parts can be reduced. And manufacturing is simplified.
[0050]
In addition, since the diaphragm stopper 11 is made of a resin excellent in heat resistance and gasoline resistance, the diaphragm 10 is not deformed in contact with the diaphragm 10, and the elastic deformation of the diaphragm 10 can be reliably regulated. The spring characteristics 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 transverse film 10 is not 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 because of excellent heat resistance and gasoline resistance.
[0051]
In addition, this invention is not limited to said Example, A various deformation | transformation etc. are possible, for example, it can apply to various vibration isolators other than an engine mount as a use.
[Brief description of the drawings]
FIG. 1 is a full sectional view of an engine mount according to an embodiment (a sectional view taken along line 1-1 of FIG. 2).
[Fig. 2] Z direction direction view of Fig. 1 [Fig. 3] X direction direction view of Fig. 1 [Fig. 4] Perspective view showing attachment of the transverse membrane stopper [Fig. 5] Enlarged sectional view of the attachment portion of the transverse membrane 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 cylinder member, 9a. 9b: mounting hole, 10: lateral membrane, 11: lateral membrane stopper, 12: stopper main body, 13: pipe portion, 15: lateral membrane 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 either the vibration generating side or the vibration receiving side; a second attachment member attached to the other side; and an elastic body member interposed therebetween, the elastic body member being A liquid seal prevention provided with a main liquid chamber as a part of a wall, a sub liquid chamber partitioned by a partition member from the main liquid chamber and covered with a flexible membrane member, and an orifice passage communicating these both liquid chambers In the vibration device,
An elastic cylinder member provided between the elastic main body member and the partition member and surrounding the main liquid chamber;
A tubular member surrounding the elastic tubular member;
Formed in a part of the elastic cylindrical member by a hole provided in a part of a cylindrical insert member integrally formed as a core metal fitting on the elastic member of the elastic cylindrical member, and the internal pressure fluctuations facing the main liquid chamber A movable film that absorbs the movable film, a movable film stopper that regulates deformation of the movable film, a free state that allows elastic deformation of the movable film with respect to the movable film stopper, and a movable film stopper An internal pressure control means for changing to a restrained state in which the movable film is closely attached,
The movable film and the movable film stopper are each composed of heat resistance and gasoline resistance materials form a non-circular,
And the movable film stopper is fitted into a mounting hole provided in the cylindrical member corresponding to the movable film, and the periphery thereof is tightly sealed to the movable film. . The movable film stopper is formed on the surface facing the working chamber formed between the movable films. A protrusion and a seal surface surrounded by the protrusion, and a space is formed between the protrusion and the outermost peripheral protrusion, and the space and the space on the seal surface side communicate with each other with the protrusion interposed therebetween. The liquid seal vibration isolator according to claim 1. 3. The liquid according to claim 2, wherein the sheet surface has a curved surface with a central portion projecting toward the movable membrane, and one end of a vent hole leading to the working chamber is opened at the central portion. Seal vibration isolator.

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