JP2016114145A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent degradation of vibration-proofing property while securing sealability between a first mounting member and a partitioning member.SOLUTION: A vibration control device includes a first mounting member 11 and a second mounting member 12, a first elastic body 13 connecting the first and second mounting members 11, 12, a diaphragm 14 defining a liquid chamber 15 with the first elastic body 13, and a partitioning member 18 for dividing the liquid chamber 15 into the pressure reception liquid chamber 16 and the auxiliary liquid chamber 17. The partitioning member 18 is provided with a restriction passage 22 for communicating the pressure reception liquid chamber 16 with the auxiliary liquid chamber 17, the first mounting member 11 is provided with a cylindrical press-fit elastic body 43 projecting toward one side in an axial direction, the partitioning member 18 is provided with a press-fit cylindrical portion 18a which is projected toward the other side in the axial direction and to which the press-fit elastic body 43 is press-fitted, the restriction passage 22 is formed on the partitioning member 18 at a position excluding an inner peripheral face of the press-fit cylindrical portion 18a, and an outer peripheral face of the press-fit elastic body 43 and an inner peripheral face of the press-fit cylindrical portion 18a have diameters gradually expanded from one side to the other side in the axial direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vibration isolator.

Conventionally, a cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, a second mounting member connected to the other, and the first and second mounting members An elastic body that is elastically coupled to each other, a diaphragm that is disposed away from the elastic body on one side in the axial direction of the first mounting member, and that defines a liquid chamber between the elastic body, and a liquid chamber A partition member that divides the pressure receiving liquid chamber with the elastic body as a part of the wall surface and a sub liquid chamber with the diaphragm as a part of the wall surface, and the pressure receiving liquid chamber and the sub liquid chamber communicate with the partition member. There has been known a vibration isolator in which a restriction passage is formed.
As this type of vibration isolator, for example, as shown in Patent Document 1 below, a metal first mounting member gradually increases in diameter from one side to the other side in the axial direction, and is a metal partition member. Is formed in a cylindrical shape, and its inner peripheral surface gradually increases in diameter from one side in the axial direction toward the other side, and a configuration in which the first mounting member is fitted in the partition member is known. Yes. In this vibration isolator, an annular groove is formed on the inner circumferential surface of the partition member, and the annular groove is sealed from the inside in the radial direction by the first mounting member, thereby defining a restriction passage. Yes.

Japanese Patent Laid-Open No. 10-184767

  However, in the conventional vibration isolator, since the first metal mounting member is fitted in the metal partition member, it is difficult to ensure the sealing performance between the two, and there is a limitation. Since the passage is defined by sealing the annular concave groove formed in the partition member with the first mounting member, there is a possibility that the vibration-proof characteristic is deteriorated.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to prevent deterioration of the vibration isolation characteristics while ensuring the sealing performance between the first attachment member and the partition member.

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention includes a cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, a second mounting member coupled to the other, and the first of these. A first elastic body that elastically couples the second mounting members; and a first elastic body that is disposed away from the first elastic body on one side in the axial direction of the first mounting member, and the first elastic body, And a partition that partitions the liquid chamber into a pressure receiving liquid chamber having the first elastic body as a part of a wall surface and a sub liquid chamber having the diaphragm as a part of the wall surface. A vibration isolator in which a restriction passage that connects the pressure receiving liquid chamber and the sub liquid chamber is formed in the partition member, wherein the first mounting member includes one of the axial directions. A cylindrical press-fit elastic body projects toward the side, and the partition member has the axial direction A press-fit cylinder part that protrudes toward the other side and into which the press-fit elastic body is press-fitted is disposed, and the restriction passage is located at a position that avoids the inner peripheral surface of the press-fit cylinder part in the partition member. The outer peripheral surface of the press-fit elastic body and the inner peripheral surface of the press-fit cylinder portion are formed so that the diameter gradually increases from one side to the other side in the axial direction.

In this case, since the press-fit elastic body is press-fitted into the press-fit cylinder portion, the sealing performance between the first attachment member and the partition member can be ensured. In addition, since the outer peripheral surface of the press-fit elastic body and the inner peripheral surface of the press-fit cylinder portion gradually increase in diameter from one side of the axial direction toward the other side, the first mounting member and the second mounting member are When the main rubber elastically connected by the first elastic body and the partition member are assembled, the press-fit elastic body can be easily press-fitted into the press-fit cylinder portion.
Furthermore, since the restricting passage is formed at a position avoiding the inner peripheral surface of the press-fitting cylinder portion of the partition member, it is possible to prevent the press-fitting elastic body from being recessed into the restricting passage or being caught during press-fitting. It becomes possible, and the deterioration of the vibration proof property and the hindrance to the good assembly property can be prevented.

  On the outer peripheral surface of the press-fit elastic body, a seal projection that is in close contact with the inner peripheral surface of the press-fit cylinder portion may be provided.

  In this case, since the seal protrusion is provided on the outer peripheral surface of the press-fit elastic body, the sealing performance between the first attachment member and the partition member can be further ensured.

  According to the present invention, it is possible to prevent deterioration of the vibration isolation characteristics while ensuring the sealing performance between the first mounting member and the partition member.

It is a top view of a vibration isolator shown as one embodiment concerning the present invention. It is AA arrow sectional drawing of the vibration isolator shown in FIG. FIG. 3 is a cross-sectional view of the vibration isolator shown in FIG. It is the side view which looked at one latching protrusion in the main body rubber | gum of the vibration isolator shown in FIGS. 1-3 from the radial outer side. It is a perspective view of the partition member in the vibration isolator shown in FIGS.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS.
The vibration isolator 1 includes a cylindrical first mounting member 11 connected to one of the vibration generating unit and the vibration receiving unit, a second mounting member 12 connected to the other, and the first of these. A first elastic body 13 that elastically connects the second mounting members 11, 12, and a first elastic body 13 that is spaced apart from one side in the axial direction along the central axis O of the first mounting member 11. In addition, the diaphragm 14 that defines the liquid chamber 15 between the first elastic body 13 and the liquid chamber 15 includes the pressure receiving liquid chamber 16 that uses the first elastic body 13 as a part of the wall surface and the diaphragm 14 on the wall surface. The partition member 18 partitioned into the sub-liquid chamber 17 as a part and the first and second mounting members 11 and 12 are elastically connected to each other and arranged on the other side in the axial direction from the first elastic body 13. The second elastic body 19, and the first elastic body 13 and the second elastic body 1. The two divided main liquid chambers 21 having both the elastic bodies 13 and 19 as a part of the wall surface are defined between the pressure receiving liquid chamber 16 and the sub liquid chamber 17. A restriction passage 22 and two orifice passages 23 are formed to communicate the two divided main liquid chambers 21 and the sub liquid chamber 17 separately.

  Hereinafter, the one side in the axial direction is referred to as the lower side, the other side in the axial direction is referred to as the upper side, and the direction orthogonal to the central axis O in the plan view of the vibration isolator 1 viewed from the axial direction is the diameter. A direction that goes around the central axis O is called a circumferential direction.

  As shown in FIG. 3, the first attachment member 11 is formed in a multistage cylindrical shape that gradually decreases in diameter from the upper side toward the lower side. Further, as shown in FIG. 2, openings 11 a penetrating in the radial direction are formed in the first mounting member 11 at positions facing each other across the central axis O in the radial direction. In the illustrated example, two openings 11 a are formed in the first attachment member 11. The opening 11a is located over the entire axial length of the intermediate portion between the upper end portion and the lower end portion of the first mounting member 11, and is formed in a belt shape extending in the circumferential direction as shown in FIG.

  As shown in FIGS. 2 and 3, the second mounting member 12 is formed in a rod shape that is disposed coaxially with the central axis O. The second mounting member 12 is disposed on the inner side in the radial direction of the first mounting member 11. A flange portion 12 a that protrudes outward in the radial direction is formed at an intermediate position in the axial direction of the second mounting member 12. Of the flange portion 12a, a portion along the circumferential direction where the opening 11a of the first mounting member 11 is located has a smaller amount of protrusion toward the radially outer side than the other portion. In the illustrated example, as shown in FIG. 1, the flange portion 12 a has a rectangular shape with short sides extending in a direction in which the two openings 11 a face each other in a plan view viewed from the axial direction.

As shown in FIG. 2, the first elastic body 13 is formed in a cylindrical shape whose diameter is gradually reduced from the lower side toward the upper side, the upper end portion thereof being connected to the lower end portion of the second mounting member 12, and the lower end The part is connected to the lower end of the first attachment member 11.
The second elastic body 19 is formed in an annular shape, and its radially inner end is connected to a portion of the outer peripheral surface of the second mounting member 12 that is located directly below the flange portion 12a, and the radially outer end. Is connected to the upper end of the first mounting member 11. The second elastic body 19 is formed thinner than the first elastic body 13. The radially inner end of the second elastic body 19 is connected to the upper end of the first elastic body 13, and the first elastic body 13 and the second elastic body 19 are integrally formed. A connecting portion between the upper end portion of the first elastic body 13 and the inner end portion in the radial direction of the second elastic body 19 is formed in a curved shape that is recessed toward the inner side in the radial direction. In the illustrated example, the radially inner end of the second elastic body 19 is located above the radially outer end of the second elastic body 19.

  In the example shown in the figure, two divided main liquid chambers 21 between the first elastic body 13 and the second elastic body 19 are disposed, and these divided main liquid chambers 21 include the first elastic body 13 and the first elastic body 13. Two partition walls 24 that divide the annular space between the two elastic bodies 19 in the circumferential direction are provided. The partition wall 24 is connected to a portion located between the two openings 11 a adjacent to each other in the circumferential direction in the intermediate portion of the first mounting member 11. The partition wall 24 is formed integrally with the first and second elastic bodies 13 and 19. The two partition walls 24 are arranged in the same straight line in a plan view of the vibration isolator 1 viewed from the axial direction.

  The partition member 18 includes a storage chamber 26 in which the membrane 25 is stored, a first communication hole 27 that connects the storage chamber 26 and the pressure-receiving liquid chamber 16, and a second communication that connects the storage chamber 26 and the auxiliary liquid chamber 17. A communication hole 28 is formed. The restriction passage 22 is formed in the partition member 18 at a portion located on the outer side in the radial direction from the accommodation chamber 26 and the first and second communication holes 27 and 28. The orifice passage 23 is formed on the outer peripheral surface of the partition member 18. In the illustrated example, the partition member 18 is formed in a bottomed cylindrical shape in which a peripheral wall portion 18a (press-fit cylinder portion) protrudes upward from the bottom wall portion, and the storage chamber 26, the first, The second communication holes 27 and 28 and the restriction passage 22 are formed, and the lower end portion of the first mounting member 11 is fitted into the peripheral wall portion 18a via a press-fit elastic body 43 described later. The inner peripheral surface of the peripheral wall portion 18a gradually increases in diameter from the lower side toward the upper side, and in the illustrated example, the inner peripheral surface is formed in a tapered shape extending linearly in the longitudinal sectional view of the peripheral wall portion 18a. The restriction passage 22 and the orifice passage 23 are formed in the partition member 18 at a position avoiding the inner peripheral surface of the peripheral wall portion 18a. The restricting passage 22 and the orifice passage 23 are formed in the partition member 18 but are not opened on the inner peripheral surface of the peripheral wall portion 18a, and the inner peripheral surface of the peripheral wall portion 18a constitutes the limiting passage 22 and the orifice passage 23. Not done. Further, the storage chamber 26 and the first and second communication holes 27 and 28 are formed in the central portion in the radial direction of the bottom wall portion of the partition member 18.

Here, in the present embodiment, the outer tube 29 is externally fitted integrally with the entire area of the first mounting member 11 except the lower end portion and the peripheral wall portion 18a of the partition member 18. The outer cylinder 29 closes the opening 11a of the first attachment member 11 in a liquid-tight manner. The first attachment member 11 is connected to either one of the vibration generating unit and the vibration receiving unit via the outer cylinder 29.
A diaphragm member 31 formed in a bottomed cylindrical shape with an elastic material is extended downward at the lower end portion of the outer cylinder 29, and the bottom wall portion of the partition member 18 is fitted into the diaphragm member 31. ing. A central portion of the bottom portion of the diaphragm member 31 defines a sub liquid chamber 17 and is a diaphragm 14 that expands and contracts as the liquid flows into and out of the sub liquid chamber 17.

In this embodiment, as shown in FIG. 3 and FIG. 4, the two partition walls 24 protrude from the outer peripheral surface of the first mounting member 11 toward the outside in the radial direction and face the lower end surface (one Locking projections 35 and 36 are formed separately so that the end surface abuts the upper end surface (the other end surface) of the partition member 18 facing upward. Of these locking projections 35 and 36, either one has a larger amount of projection downward than the other. That is, either one of the lower end surfaces of the locking projections 35 and 36 is located below the other lower end surface.
As shown in FIG. 3, between the locking projections 35, 36 and the partition wall 24, between the two openings 11 a adjacent to each other in the circumferential direction in the intermediate portion of the first mounting member 11. The part located in is interposed. The locking projections 35 and 36 and the partition wall 24 are connected to each other across the periphery of the opening 11a of the first mounting member 11 and are integrally formed.

The other locking projection 36 is formed in a rectangular parallelepiped shape and has a rectangular shape with a pair of sides extending in the circumferential direction and the remaining pair of sides extending in the axial direction as viewed from the outside in the radial direction. In addition, when viewed from the circumferential direction, the pair of sides extends in the radial direction and the remaining pair of sides extends in the axial direction.
As shown in FIG. 4, one of the locking projections 35 has a base 35a having the same size and the same shape as the other locking projection 36, a shorter peripheral length than the base 35a, and a base. A tip portion 35b projecting downward from the lower end surface of 35a. The distal end portion 35b is formed in a rectangular parallelepiped shape similar to the base portion 35a, and the outer peripheral surface of the distal end portion 35b is flush with the outer peripheral surface of the base portion 35a. The distal end portion 35b is disposed at the central portion in the circumferential direction of the base portion 35a.

The upper end surface of the partition member 18 is formed with a raised portion 38 that protrudes upward as shown in FIGS. 3 and 5. In the illustrated example, the raised portion 38 is formed at the upper end opening edge of the peripheral wall portion 18a of the partition member 18, and has a C-shape extending in the circumferential direction when viewed from above. The raised portions 38 are located on both sides in the circumferential direction and gradually extend upward from the outer side to the inner side in the circumferential direction, and are located between the inclined surfaces 38a and face upward. And a flat surface 38b.
The raised portion 38 is formed with a first support portion 41 that supports the lower end portion of the other locking projection portion 36, and each opening portion 23 a on the divided main liquid chamber 21 side in the two orifice passages 23. .

  The 1st support part 41 is formed in the concave shape by which the lower end part of the other latching protrusion 36 is fitted. A concave second support portion 42 is formed at the upper end opening edge of the peripheral wall portion 18a of the partition member 18 to which the distal end portion 35b of one locking projection 35 is fitted. Further, the peripheral lengths of the distal end portion 35b of the one locking projection 35 and the other locking projection 36 are different from each other, and the circumferential lengths of the distal end portion 35b of the one locking projection 35 and the second support portion 42 are different. Are equal to each other, and the circumferential lengths of the other locking projection 36 and the first support portion 41 are equal to each other. The 1st support part 41 and the 2nd support part 42 have penetrated the upper end opening edge of the surrounding wall part 18a of the partition member 18 to radial direction.

The first support portion 41 and the opening 23 a of the orifice passage 23 are formed on the flat surface 38 b of the raised portion 38. The opening 23a of the orifice passage 23 is disposed on the flat surface 38b of the raised portion 38 with a space in the circumferential direction, and the first support portion 41 is disposed between the openings 23a. Of the flat surface 38 b of the raised portion 38, each portion where the opening 23 a is formed is a part of each inner surface that defines the two divided main liquid chambers 21.
The second support portion 42 is disposed on the opposite side of the first support portion 41 that sandwiches the central axis O in the radial direction in the upper end opening edge of the peripheral wall portion 18 a of the partition member 18.
Further, in the orifice passage 23, an end portion on the opening 23a side extends gradually upward toward the opening portion 23a along the extending direction of the passage 23, and the other portion is the opening portion. It is located below the portion 23a and extends in the circumferential direction.

  Here, the flow path length and the flow path cross-sectional area of the restriction passage 22 are set (tuned) so that the resonance frequency of the restriction passage 22 becomes a predetermined frequency. The flow path length and flow path cross-sectional area of the orifice passage 23 are set (tuned) so that the resonance frequency of the orifice passage 23 becomes a predetermined frequency. Examples of the predetermined frequency include a frequency of idle vibration (for example, a frequency of 18 Hz to 30 Hz and an amplitude of ± 0.5 mm or less), and a shake vibration having a frequency lower than that of the idle vibration (for example, or a frequency of 14 Hz or less). , The amplitude of which is greater than ± 0.5 mm).

  By the way, as shown in FIGS. 2 to 4, a cylindrical press-fit elastic body 43 protrudes downward from the first mounting member 11. The press-fit elastic body 43 is disposed coaxially with the central axis O, and protrudes downward from the lower end portion of the first mounting member 11. The outer peripheral surface of the press-fit elastic body 43 gradually increases in diameter from the lower side toward the upper side. In the illustrated example, the outer peripheral surface is formed in a tapered shape extending linearly in a longitudinal sectional view of the press-fit elastic body 43. The press-fit elastic body 43 is press-fitted into the peripheral wall portion 18 a of the partition member 18, and the first attachment member 11 is fitted into the peripheral wall portion 18 a via the press-fit elastic body 43.

  The press-fit elastic body 43 is formed integrally with the first elastic body 13. The first elastic body 13 and the press-fit elastic body 43 are connected across the lower end edge of the first mounting member 11 and the periphery of the opening 11a. The press-fit elastic body 43 is integrally formed with one locking projection 35 and the other locking projection 36. The press-fit elastic body 43 is disposed radially inward and below the one locking projection 35 and the other locking projection 36 and is connected across the outer peripheral surface of the first mounting member 11. .

  On the outer peripheral surface of the press-fit elastic body 43, as shown in FIG. 4, a seal projection 43 a that is in close contact with the inner peripheral surface of the peripheral wall portion 18 a of the partition member 18 protrudes. The seal projection 43a protrudes radially outward from the upper end of the press-fit elastic body 43 in a state where the press-fit elastic body 43 is detached from the peripheral wall 18a, and the press-fit elastic body 43 enters the peripheral wall 18a. In the press-fitted state, it is elastically compressed in the radial direction.

Note that the vibration isolator 1 of the present embodiment is a compression type (upright type) that is attached and used so that the pressure receiving liquid chamber 16 is positioned on the upper side in the vertical direction and the auxiliary liquid chamber 17 is positioned on the lower side in the vertical direction. ).
For example, when the vibration isolator 1 is attached to an automobile, the second attachment member 12 is connected to an engine or the like as a vibration generating unit, while the first attachment member 11 and the outer cylinder 29 are subjected to vibration reception via a bracket (not shown). It is used by being connected to a vehicle body as a part. In an automobile, main vibration along the vertical direction and side vibration along the front-rear direction or the left-right direction of the vehicle body are easily input from the engine to the vehicle body. The vibration isolator 1 is attached so that the directions in which the two divided main liquid chambers 21 face each other coincide with, for example, the front-rear direction or the left-right direction, and main vibration is input in the axial direction. The sub vibration is input in the direction in which the main liquid chambers 21 face each other.

  Next, the operation of the vibration isolator 1 configured as described above will be described.

First, when a main vibration is input from the vibration generating unit, the first mounting member 11 and the second mounting member 12 are relatively displaced in the axial direction while elastically deforming the first elastic body 13.
At this time, the pressure receiving liquid chamber 16 is expanded or contracted by, for example, relative displacement between the first mounting member 11 and the second mounting member 12 or elastic deformation of the first elastic body 13. Further, the liquid flows through the restriction passage 22 between the pressure receiving liquid chamber 16 and the sub liquid chamber 17, and liquid column resonance occurs in the restriction passage 22. Thereby, vibration having a frequency equivalent to the resonance frequency of the restriction passage 22 is absorbed and attenuated.

In addition, when the sub-vibration is input from the vibration generating unit, the first attachment member 11 and the second attachment member 12 elastically deform the first elastic body 13 and the second elastic body 19 and the two divided main liquids. The chambers 21 are relatively displaced in directions facing each other. As a result, the pair of divided main liquid chambers 21 expand and contract separately, and the liquid flows through the orifice passage 23 between the divided main liquid chamber 21 and the sub liquid chamber 17, and liquid column resonance occurs in the orifice passage 23. . Further, vibration having a frequency equivalent to the resonance frequency of the orifice passage 23 is absorbed and attenuated.
In addition, the membrane 25 is deformed or displaced in the axial direction in the storage chamber 26 in response to the input of the high frequency vibration, and between the pressure receiving liquid chamber 16 and the sub liquid chamber 17 through the first and second communication holes 27 and 28. By causing the liquid to circulate, the increase in the dynamic spring constant of the first elastic body 13 is suppressed, and this vibration is absorbed and damped.

As described above, according to the vibration isolator 1 according to the present embodiment, the press-fit elastic body 43 is press-fitted into the peripheral wall portion 18 a of the partition member 18, and therefore, between the first mounting member 11 and the partition member 18. The sealing property can be ensured. Moreover, since the outer peripheral surface of the press-fit elastic body 43 and the inner peripheral surface of the peripheral wall portion 18a of the partition member 18 gradually increase in diameter from the lower side to the upper side, the first mounting member 11 and the second mounting member 12 When the main body rubber 40 elastically connected by the first and second elastic bodies 13 and 19 and the partition member 18 are assembled, the press-fit elastic body 43 is easily press-fitted into the peripheral wall portion 18 a of the partition member 18. can do.
Further, since the restriction passage 22 is formed at a position avoiding the inner peripheral surface of the peripheral wall portion 18a of the partition member 18 in the partition member 18, the press-fit elastic body 43 is recessed into the restriction passage 22 or at the time of press-fitting. It becomes possible to prevent it from being caught, and it is possible to prevent the deterioration of the vibration-proof characteristic and the hindrance to the good assembly property.

  In addition, since the seal protrusion 43 a is provided on the outer peripheral surface of the press-fit elastic body 43, the sealing performance between the first attachment member 11 and the partition member 18 can be further ensured.

  The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the compression-type configuration is shown as the vibration isolator 1, but it is attached so that the divided main liquid chamber 21 is positioned on the lower side in the vertical direction and the sub liquid chamber 17 is positioned on the upper side in the vertical direction. It may be a suspended type configuration.
Moreover, the 1st, 2nd support parts 41 and 42 are not restricted to a concave shape, For example, you may exist in a flat surface.
Further, the peripheral lengths of the front end 35b of the one locking projection 35 and the other locking projection 36 may be equal to each other.
Moreover, as one latching protrusion 35, you may employ | adopt the structure which does not have the base 35a but consists only of the front-end | tip part 35b.
Further, the locking projections 35 and 36, the raised portion 38, and the seal projection 43a may be omitted.
In the above embodiment, the partition member 18 is formed with the two orifice passages 23 for communicating the two divided main liquid chambers 21 and the sub liquid chamber 17 separately. You may form the orifice channel | path which connects the liquid chambers 21 mutually. Further, the two divided main liquid chambers 21 may not be provided, and the present invention can be applied to a configuration that absorbs and absorbs only the main vibration.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 11 1st attachment member 12 2nd attachment member 13 1st elastic body 14 Diaphragm 15 Liquid chamber 16 Pressure receiving liquid chamber 17 Sub liquid chamber 18 Partition member 18a Peripheral wall part (Press-fit cylinder part)
22 Restricted passage 43 Press-fit elastic body 43a Seal projection

Claims (2)

A cylindrical first mounting member coupled to either one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
A first elastic body that elastically connects these first and second mounting members;
A diaphragm that is disposed apart from the first elastic body on one side in the axial direction of the first mounting member, and that defines a liquid chamber between the first elastic body;
A partition member that divides the liquid chamber into a pressure receiving liquid chamber having the first elastic body as a part of a wall surface and a sub liquid chamber having the diaphragm as a part of a wall surface;
A vibration isolator in which a restriction passage that connects the pressure receiving liquid chamber and the sub liquid chamber is formed in the partition member,
The first attachment member is provided with a cylindrical press-fit elastic body projecting toward one side in the axial direction,
The partition member is provided with a press-fit cylinder portion that protrudes toward the other side in the axial direction and into which the press-fit elastic body is press-fitted, and
The restriction passage is formed at a position avoiding the inner peripheral surface of the press-fitting cylinder portion of the partition member,
The anti-vibration device according to claim 1, wherein the outer peripheral surface of the press-fit elastic body and the inner peripheral surface of the press-fit cylinder portion are gradually enlarged in diameter from one side in the axial direction toward the other side.   The anti-vibration device according to claim 1, wherein a seal protrusion that is in close contact with an inner peripheral surface of the press-fit cylinder portion is provided on the outer peripheral surface of the press-fit elastic body.

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