JP4333877B2 - Liquid-filled vibration isolator - Google Patents

Description

  The present invention includes a first fixture, a cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and a vibration isolating base attached to the second fixture. A diaphragm for forming a liquid sealing chamber, a partition for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, the first liquid chamber and the second liquid chamber The partition body comprises an elastic partition membrane and a pair of displacement regulating members that regulate the amount of displacement of the elastic partition membrane from both sides of the membrane surface, and the pair of displacement regulating members The present invention relates to a liquid-filled vibration isolator having openings.

  The liquid filled type vibration damping device is provided, for example, between an automobile transmission and a body frame. When a large amplitude vibration occurs due to the unevenness of the traveling road surface, the elastic partition membrane is restricted from being deformed by the displacement restricting member, and the liquid flows between the two liquid chambers through the orifice. Damping vibration. On the other hand, when a vibration with a small amplitude occurs, the liquid does not flow between the two liquid chambers, and the elastic partition film is reciprocally deformed to absorb the internal pressure of the first liquid chamber and attenuate the vibration.

In this type of liquid-filled vibration isolator, noise is likely to occur when large amplitude vibrations are input and the elastic partition membrane collides with the displacement regulating member. Therefore, conventionally, the noise has been reduced by reducing the distance between the pair of displacement regulating members (see Patent Document 1).
JP 2000-294078 A

  However, according to the above-described conventional configuration, since the distance between the pair of displacement restricting members has been reduced, a new problem has arisen that the dynamic spring constant in the high frequency range is increased and a booming noise is likely to occur. .

  An object of the present invention is to provide a liquid-filled vibration isolator capable of reducing the dynamic spring constant in the high frequency range and preventing the generation of a muffled sound while having a structure capable of sufficiently reducing abnormal noise. There is in point to do.

The feature of the first invention is the liquid-filled vibration isolator described in the [Technical field] at the beginning.
The elastic partition membrane includes a thick portion on the radial center side located in the first opening of the opening portions of the pair of displacement regulating members when viewed in the axial direction of the elastic partition membrane, and a radial direction of the thick portion A thin-walled portion located on the outer side, positioned in the middle of the thick-walled portion in the thickness direction of the thick-walled portion and spaced apart from the pair of displacement-regulating members, and an outer peripheral side with respect to the displacement-regulating member The fixed portion and the thick portion are integrally provided at a boundary portion on one surface side of the thin portion and the thick portion in a state of being radially positioned around the thick portion, and the top portion is in contact with one displacement regulating member. A second rib is integrally provided at a boundary portion on the other surface side of the thin wall portion and the thick wall portion so as to be radially positioned around the thick wall portion, and a top portion is in contact with the other displacement regulating member. Consisting of ribs,
The thickness of the thick part is set to 2.1 times or more of the thickness of the thin part, and according to this configuration, the following operations [a] to [d] can be achieved. it can.

  [A] When vibration with a small amplitude occurs, the liquid does not flow between the first liquid chamber and the second liquid chamber, and the internal pressure (hydraulic pressure) of the first liquid chamber passes through the opening of the displacement regulating member. It passes through to the thick part and thin part of the elastic partition membrane. As a result, the thick-walled portion and the thin-walled portion are reciprocally deformed to absorb the internal pressure of the first liquid chamber and attenuate the vibration with a small amplitude. When large-amplitude vibration occurs and the internal pressure of the first liquid chamber reaches a predetermined value, the deformation of the thick part and the thin part reaches a limit, and the liquid flows between the two liquid chambers through the orifice. The vibration of large amplitude is attenuated by the liquid flow effect.

  [B] When the above-described large-amplitude vibration occurs, the thick-walled portion of the elastic partition film repeatedly collides and separates from the displacement regulating member. By providing this thick part, the length from the film surface of the thick part to the surface of the displacement regulating member facing it can be shortened, and the abnormal noise at the time of the collision is reduced. can do. Moreover, the space | interval of the film surface of a thin part and the surface of the displacement control member facing this can be set to some extent, and the malfunction that the dynamic spring constant of a high frequency area becomes high can be avoided.

  [C] The present inventor manufactured a plurality of elastic partition films having different thickness ratios [(thickness of thick part) / (thickness of thin part)], and each elastic partition film is provided separately. For each liquid-filled vibration isolator, the maximum dynamic load applied to the liquid-filled vibration isolator was determined. The result is shown in FIG. The numerical value on the horizontal axis in FIG. 8 represents the thickness magnification of the elastic partition membrane. The numerical value on the left vertical axis represents the magnitude (dB) of the dynamic load with respect to the standard dynamic load of the vehicle, and 0 dB when the value of the dynamic load is a predetermined value. A curve Y in FIG. 8 is a thickness magnification-dynamic load curve. According to FIG. 8, the dynamic load increases as the thickness magnification increases. On the other hand, a dynamic magnification was obtained for each liquid-filled type vibration isolator equipped with each elastic partition membrane. This dynamic magnification means (Kd100) / (Kd20) when the dynamic spring constant of the liquid-filled vibration isolator at 100 Hz is Kd100 and the dynamic spring constant at 20 Hz is Kd20. The numerical value on the right vertical axis in FIG. 8 represents the magnitude (dB) of the dynamic magnification relative to the standard dynamic magnification of the vehicle, and 0 dB when the value of the dynamic magnification is a predetermined value. A curve X in FIG. 8 is a thickness magnification-dynamic magnification curve. According to FIG. 8, the thickness magnification is near 2.1, specifically, the dynamic magnification becomes 0 dB (Kd100 and Kd20 are equal) at the value of point A of 2.141, and the dynamic magnification decreases as the thickness magnification increases. It has become. The value of the point A is obtained from the equation of the curve X (details are omitted).

  [D] As described above, when a large-amplitude vibration is applied to the liquid-filled vibration isolator, the elastic partition film repeatedly collides with and separates from the displacement regulating member. By setting the thickness of the thick part to 2.1 times or more of the thickness of the thin part (thickness magnification is 2.1 or more), as shown in FIG. Noise can be reduced, and the dynamic magnification can be set to 0 dB or less, the dynamic spring constant in the high frequency range can be reduced, and the generation of murmurs in the high frequency range. We were able to confirm that it could be prevented.

The feature of the second invention is the liquid-filled vibration isolator described in [Technical field] at the beginning.
The elastic partition membrane includes a thick portion on the radial center side located in the first opening of the opening portions of the pair of displacement regulating members when viewed in the axial direction of the elastic partition membrane, and a radial direction of the thick portion A thin-walled portion located on the outer side, positioned in the middle of the thick-walled portion in the thickness direction of the thick-walled portion and spaced apart from the pair of displacement-regulating members, and an outer peripheral side with respect to the displacement-regulating member The fixed portion and the thick portion are integrally provided at a boundary portion on one surface side of the thin portion and the thick portion in a state of being radially positioned around the thick portion, and the top portion is in contact with one displacement regulating member. A second rib is integrally provided at a boundary portion on the other surface side of the thin wall portion and the thick wall portion so as to be radially positioned around the thick wall portion, and a top portion is in contact with the other displacement regulating member. Consisting of ribs,
The ratio of the area of the film surface of the thick part to the area of the film surface of the thin part is set in the range of 1: 4.3 to 1: 7.

  According to this configuration, in addition to the same operations as [A] and [B], the following operations [E] to [F] can be achieved.

  [E] The present inventor manufactured a plurality of elastic partition membranes having different area ratios [(area of the membrane surface of the thin portion) / (area of the membrane surface of the thick portion)] of each elastic partition membrane. The maximum dynamic load applied to the liquid-filled vibration isolator was determined for each liquid-filled vibration-proof device provided separately. The result is shown in FIG. The numerical value on the horizontal axis in FIG. 9 represents the area ratio, and the numerical value on the left vertical axis represents the magnitude (dB) of the dynamic load with respect to the standard dynamic load of the vehicle, and 0 dB when the value of the dynamic load is a predetermined value. It is. The curve Z in FIG. 9 is an area ratio-dynamic load curve, and according to FIG. 9, the dynamic load increases as the area ratio increases. On the other hand, a dynamic magnification was obtained for each liquid-filled type vibration isolator equipped with each elastic partition membrane. This dynamic magnification means (Kd100) / (Kd20) when the dynamic spring constant of the liquid-filled vibration isolator at 100 Hz is Kd100 and the dynamic spring constant at 20 Hz is Kd20. The numerical value on the vertical axis on the right side of FIG. 9 represents the magnitude (dB) of the dynamic magnification relative to the standard dynamic magnification of the vehicle, and is 0 dB when the value of the dynamic magnification is a predetermined value. A curve V in FIG. 9 is an area ratio-dynamic magnification curve. According to FIG. 9, the area ratio is around 4.3, specifically, the value of point A is 4.279, and the dynamic magnification becomes 0 dB (Kd100 and Kd20 are equal). The larger the area ratio, the smaller the dynamic ratio. It has become. The value of the point A is obtained from the equation of the curve V (details are omitted). Then, the area ratio is around 7, specifically, the dynamic load becomes 0 dB at 6.970 which is the value of the point B, and the dynamic load becomes smaller as the area ratio becomes smaller from around 7. The value of the point B is obtained from the equation of the curve Z (details are omitted).

  [F] As described above, when a large-amplitude vibration is applied to the liquid-filled vibration isolator, the elastic partition film repeatedly collides with and separates from the displacement regulating member. The ratio of the area of the film surface of the thick part to the area of the film surface of the thin part is set within the range of 1: 4.3 to 1: 7 (the area ratio is 4.3 to 7.0). As shown in FIG. 9, an increase in dynamic load can be suppressed to reduce the noise during the collision, and the dynamic magnification can be set low (approximately 0 or less). It was confirmed that the dynamic spring constant in the high frequency range can be reduced, and the generation of the humming noise in the high frequency range can be prevented.

In the first invention or the second invention, the first rib and the second rib may be sandwiched between the pair of displacement regulating members.

  According to the present invention, there is provided a liquid-filled vibration isolator capable of sufficiently reducing dynamic spring constants in a high frequency range and preventing occurrence of booming noise while having a structure capable of sufficiently reducing abnormal noise. We were able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a liquid-filled vibration isolator for an FR vehicle. This liquid-filled vibration isolator includes a first mounting bracket 1 that is mounted on a transmission via a mounting bracket 114, a cylindrical second mounting bracket 2 that is mounted on a member on the vehicle body side, and a rubber-like elastic that connects them. And an anti-vibration base 3 made of a material.

  The first mounting bracket 1 is formed in a stepped columnar shape having a flange-like stoppered portion 132, and its upper end portion is connected to the mounting bracket 114. The second mounting bracket 2 includes a cylindrical metal fitting 4 on which the vibration isolating base 3 is vulcanized, a cylindrical bottom metal fitting 5, and a cylindrical stopper metal fitting 107 that covers the vibration isolating base 3 and the stopper portion 132. Become. These three members are positioned concentrically, and the flanges on one end side in the axial direction are caulked and fixed integrally.

  The stopper fitting 107 limits the amount of displacement between the first attachment fitting 1 and the second attachment fitting 2. A mounting surface portion 110 as a connecting portion for a member on the vehicle body side is formed on the stopper metal fitting 107 so as to protrude, and a plurality of mounting bolts 6 are press-fitted and fixed to the mounting surface portion 110.

  The anti-vibration base 3 is formed in a truncated cone shape having a hollow bottom, and its upper end surface is vulcanized and bonded to the first mounting bracket 1 and its lower end is vulcanized and bonded to the cylindrical fitting 4. A diaphragm 9 made of a rubber film that forms a liquid sealing chamber 8 between the bottom metal plate 5 and the lower surface of the vibration isolating substrate 3 is vulcanized and the liquid sealed in the liquid sealing chamber 8.

  A partition 12 that divides the liquid sealing chamber 8 into a first liquid chamber 11A on the vibration-isolating base 3 side and a second liquid chamber 11B on the diaphragm side is sandwiched and fixed between the bottom of the bottom metal 5 and the bottom of the cylindrical metal 4. ing. The partition 12 includes a disc-shaped elastic partition film 15 made of a rubber film, and a cylindrical member that houses the elastic partition film 15 and is received by a first displacement regulating member 17 that is integrally provided between the inner peripheral surfaces. 16 and a second displacement regulating member 18 that covers the opening on one end side of the cylindrical member 16. That is, the first displacement regulating member 17 and the second displacement regulating member 18 regulate the displacement amount of the elastic partition film 15 from both sides of the film surface of the elastic partition film 15. Openings 54 and 84 are formed in the first displacement restricting member 17 and the second displacement restricting member 18 so as to overlap each other when viewed in the axial direction of the elastic partition film 15.

  An orifice 25 that allows the first liquid chamber 11A and the second liquid chamber 11B to communicate with each other is vulcanized between the outer peripheral surface of the cylindrical member 16 and the inner peripheral surface of the bottom metal fitting 5 (specifically, vulcanized on the inner peripheral surface of the bottom metal fitting 5). (Between the molded rubber film 7). As shown in FIGS. 3 and 4, the cylindrical member 16 includes an orifice forming groove 83 on the outer peripheral portion. The orifice 25 communicates with the first liquid chamber 11A via the first through hole 55 (see FIG. 6) of the second displacement regulating member 18 and the upper notch 58 (see FIG. 3) of the tubular member 16, and the tubular member. 16 communicates with the second liquid chamber 11 </ b> B through a lower notch 80.

  As shown in FIG. 7, the second displacement regulating member 18 includes a cylindrical portion 20 on the outer peripheral side, and the cylindrical portion 20 is externally fitted to one end portion of the cylindrical member 16.

  As shown in FIG. 5, the opening 84 of the second displacement regulating member 18 has a circular first opening 84A formed at the center in the radial direction and four pieces formed by being distributed around the first opening 84A. Arc-shaped second opening 84B. The four second openings 84B have the same size and shape as each other, and are positioned point-symmetrically around the axis of the first opening 84A.

  As shown in FIG. 3, the opening 54 of the first displacement regulating member 17 has a circular first opening 54A formed at the center in the radial direction and four pieces formed by being distributed around the first opening 54A. Arc-shaped second opening 54B. The four second openings 54B have the same size and shape as each other, and are positioned point-symmetrically around the axis of the first opening 54A.

  The first opening 54A of the first displacement regulating member 17 and the first opening 84A of the second displacement regulating member 18 have the same size and shape, and the second opening 54B of the first displacement regulating member 17 and the second displacement The second opening 84B of the regulating member 18 has the same size and shape. Then, when viewed in the axial direction, the first opening 54A of the first displacement regulating member 17 and the first opening 84A of the second displacement regulating member 18 are located at the same position and overlap, and the first displacement regulating member The 17 second openings 54B and the second openings 84B of the second displacement restricting member 18 are overlapped at the same position.

  As shown in FIG. 7, the elastic partition membrane 15 includes a disk-shaped thick portion 50 on the radial center side located in the first opening 54 </ b> A (84 </ b> A) in the axial direction of the elastic partition membrane 15, and The pair of displacement regulating members 17 are located on the radially outer side of the thick portion 50, located in the middle portion of the thick portion 50 in the thickness direction of the thick portion 50 (axial direction of the elastic partition film 15). , 18 (the first displacement regulating member 17 and the second displacement regulating member 18), the thin-walled portion 51 positioned away from the displacement-regulating members 17, 18, the outer peripheral fixing portion 52, and the thick-walled portion 50. Eight first ribs 53A that are integrally provided at a boundary portion on one surface side of the thin wall portion 51 and the thick wall portion 50 in a radially positioned state, and the top portion 81 abuts against the first displacement regulating member 17; The other of the thin part 51 and the thick part 50 in a state of being radially positioned around the thick part 50 It provided integrally on the boundary portion of the side, consisting of eight second ribs 53B which top 101 is brought into contact with the second displacement-regulating member 18 of the other. The length from the top surface of the first rib 53A to the top surface of the second rib 53B is longer than the distance between the opposing surfaces of the first displacement regulating member 17 and the second displacement regulating member 18, and therefore the first rib 53A and the second rib 53B are sandwiched between the first displacement regulating member 17 and the second displacement regulating member 18.

  The thickness of the thick part 50 is set to 2.1 times the thickness of the thin part 51.

  As shown in FIGS. 5 and 7, the first rib 53A and the second rib 53B are short ribs so that the first rib 53A and the second rib 53B are located only on the boundary portion side between the thick portion 50 and the thin portion 51. And the film surface 91 of the thin portion 95 radially outward from the longitudinal tip surface 94 of the first rib 53A faces the second opening 54B (see FIG. 3) of the first displacement regulating member 17. The film surface 93 of the thin portion 95 radially outward from the distal end surface 94 in the longitudinal direction of the second rib 53B faces the second opening 84B (see FIGS. 5 and 6) of the second displacement regulating member 18. It is configured.

  The plurality of first ribs 53A and second ribs 53B are respectively arranged radially with respect to the axis O of the thick portion 50 and at an equal angle of 45 °, and each of the elastic partition films 15 is viewed in the axial direction. The first rib 53A and each second rib 53B overlap. As described above, the four second openings 84 </ b> B are arranged at equal angles in the circumferential direction of the thick portion 50. The second openings 54 </ b> B and 84 </ b> B have an arc shape along the circumferential direction of the thick portion 50.

  The front end surface 94 in the longitudinal direction of the first rib 53A and the front end surface 94 in the longitudinal direction of the second rib 53B are respectively formed on inclined surfaces that are located on the radially outer side as the film surface side of the thin portion 51 is reached. (See FIGS. 5 and 7). Further, the longitudinal tip surface 94 of the first rib 53A and the longitudinal tip surface 94 of the second rib 53B are located on the radially inner side of the inner peripheral edges 102 and 106 of the plurality of second openings 54B and 84B. (See FIGS. 3 and 5).

  The fixing part 52 protrudes from the thin part 51 to both sides in the thickness direction of the elastic partition film 15. The fixing portion 52 is clamped and fixed by a pair of displacement regulating members 17 and 18.

  As shown also in FIG. 7, a disc-shaped stirring plate 60 is provided in the first liquid chamber 11A, and an outer peripheral edge 61 of the stirring plate 60 and an inner peripheral surface 62 of the first liquid chamber 11A (this inner periphery) A first liquid chamber side orifice 63 is formed between the surface 62 and the surface 62 of the vibration isolator base 3.

  In the above structure, when large-amplitude vibration occurs and the internal pressure of the first liquid chamber 11A reaches a predetermined value, the deformation of the thick part 50 and the thin part 51 reaches a limit, and the liquid passes through the orifice 25 and both liquids. It flows between the chambers 11A and 11B. The vibration of large amplitude is attenuated by the liquid flow effect. When the vibration with the large amplitude occurs, the thick partition 50 side of the elastic partition film 15 (specifically, the top 81 of the first rib 53A and the top 101 of the second rib 53B on the thick section 50 side) is the first displacement. The collision and separation are repeated with respect to the regulating member 17 and the second displacement regulating member 18. That is, the first rib 53A and the second rib 53B are once separated from the first displacement restricting member 17 and the second displacement restricting member 18 due to an increase in fluid pressure, etc., and the operation of returning and colliding is repeated.

[Another embodiment]
(1) In addition to the configuration of the above embodiment, the ratio of the area of the film surfaces 120 and 121 of the thick portion 50 to the area of the film surfaces 91 and 93 of the thin portion 51 is 1: 5 (or 1: 4. It may be set within a range of 3 to 1: 7. The two membrane surfaces 120 and 121 of the thick portion 50 have the same area, and the two membrane surfaces 91 and 93 of the thin portion 51 have the same area. The ratio of the area of the film surface 120 to the area of one film surface 91 of the thin part 51 is 1: 5 (or within the range of 1: 4.3 to 1: 7), and the other film surface 121 of the thick part 50 is. Is set to 1: 5 (or in the range of 1: 4.3 to 1: 7). The areas of the film surfaces 120 and 121 of the thick portion 50 and the areas of the film surfaces 91 and 93 of the thin portion 51 do not include the areas of the first rib 53A and the second rib 53B.

  (2) As described in (1) above, the ratio of the area of the film surfaces 120 and 121 of the thick portion 50 to the area of the film surfaces 91 and 93 of the thin portion 51 is 1: 5 (or 1: 4.3 to In the configuration set within 1: 7), the thickness of the thick portion 50 may be set to less than 2.1 times the thickness of the thin portion 51.

  (4) The thickness of the thick portion 50 may be set to 2.1 times or more the thickness of the thin portion 51. In this case, if the thickness ratio [(thickness of the thick portion 50) / (thickness of the thin portion 51)] is too large, the thickness of the thin portion 51 becomes too thin. Set the thickness magnification to a value that does not become too much.

  (5) The top 81 of the first rib 53A may be separated from the first displacement restricting member 17 so that the first rib 53A is brought into contact with the first displacement restricting member 17 in response to vibration input. Good. Similarly, the top 101 of the second rib 53B may be separated from the other second displacement restricting member 18 so as to come into contact with the second displacement restricting member 18 in response to vibration input. Good. That is, the top 81 of the first rib 53A only needs to be able to contact one of the first displacement regulating members 17, and the top 101 of the second rib 53B can be brought into contact with the other second displacement regulating member 18. Good.

  (6) The present invention can also be applied to a structure in which the stirring plate 60 is not provided in the first liquid chamber 11A. Further, the present invention can also be applied to a liquid-filled vibration isolator provided between an automobile engine and a body frame.

Longitudinal section of liquid-filled vibration isolator Front view of liquid-filled vibration isolator Plan view of cylindrical member Longitudinal front view of cylindrical member Plan view of partition Plan view of second displacement regulating member Longitudinal cross section showing stir plate and surrounding structure Diagram showing characteristics of liquid-filled vibration isolator Diagram showing characteristics of liquid-filled vibration isolator

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st fixture, 2 ... 2nd fixture, 3 ... Anti-vibration base | substrate, 8 ... Liquid enclosure, 9 ... Diaphragm, 11A ... 1st liquid chamber, 11B ... 2nd liquid chamber , 12 ... partition body, 25 ... orifice, 15 ... elastic partition membrane, 17, 18 ... displacement regulating member, 54, 84 ... opening, 50 ... thick part, 51 ... thin part, 52 …… Fixed part, 91, 93 …… Thin film surface, 120, 121 …… Thick film surface.

Claims (3)

A liquid enclosure is provided between the first fixture, the cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and the vibration isolating base attached to the second fixture. Forming a diaphragm, a partition body for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, and an orifice for communicating the first liquid chamber and the second liquid chamber The partition body includes an elastic partition membrane and a pair of displacement regulating members that regulate a displacement amount of the elastic partition membrane from both sides of the membrane surface, and an opening is formed in each of the pair of displacement regulating members. A liquid-filled vibration isolator formed,
The elastic partition membrane includes a thick portion on the radial center side located in the first opening of the opening portions of the pair of displacement regulating members when viewed in the axial direction of the elastic partition membrane, and a radial direction of the thick portion A thin-walled portion located on the outer side, positioned in the middle of the thick-walled portion in the thickness direction of the thick-walled portion and spaced apart from the pair of displacement-regulating members, and an outer peripheral side with respect to the displacement-regulating member The fixed portion and the thick portion are integrally provided at a boundary portion on one surface side of the thin portion and the thick portion in a state of being radially positioned around the thick portion, and the top portion is in contact with one displacement regulating member. A second rib is integrally provided at a boundary portion on the other surface side of the thin wall portion and the thick wall portion so as to be radially positioned around the thick wall portion, and a top portion is in contact with the other displacement regulating member. Consisting of ribs,
A liquid-filled vibration isolator in which the thickness of the thick part is set to 2.1 times or more of the thickness of the thin part. A liquid enclosure is provided between the first fixture, the cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and the vibration isolating base attached to the second fixture. Forming a diaphragm, a partition body for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, and an orifice for communicating the first liquid chamber and the second liquid chamber The partition body includes an elastic partition membrane and a pair of displacement regulating members that regulate a displacement amount of the elastic partition membrane from both sides of the membrane surface, and an opening is formed in each of the pair of displacement regulating members. A liquid-filled vibration isolator formed,
The elastic partition membrane includes a thick portion on a radial center side located in a first opening of the opening portions of the pair of displacement regulating members when viewed in the axial direction of the elastic partition membrane, and a radial direction of the thick portion A thin-walled portion located on the outer side, positioned in the middle of the thick-walled portion in the thickness direction of the thick-walled portion and spaced apart from the pair of displacement-regulating members, and an outer peripheral side with respect to the displacement-regulating member The fixed portion and the thick portion are integrally provided at a boundary portion on one surface side of the thin portion and the thick portion in a state of being radially positioned around the thick portion, and the top portion is in contact with one displacement regulating member. A second rib is integrally provided at a boundary portion on the other surface side of the thin wall portion and the thick wall portion so as to be radially positioned around the thick wall portion, and a top portion is in contact with the other displacement regulating member. Consisting of ribs,
A liquid-filled vibration isolator in which a ratio of the area of the film surface of the thick part to the area of the film surface of the thin part is set within a range of 1: 4.3 to 1: 7. The liquid-filled vibration isolator according to claim 1 or 2, wherein the first rib and the second rib are sandwiched between the pair of displacement regulating members .

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