JP6071682B2 - Vibration isolator - Google Patents

Description

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

Conventionally, for example, as shown in Patent Document 1 below, a first orifice that causes a liquid column resonance in response to an input of shake vibration, a main liquid chamber, and a secondary liquid communicate with each other. A partition member having a second orifice that communicates with the chamber and causes liquid column resonance with respect to an input of idle vibration, and an opening / closing means that opens and closes the opening on the side of the secondary liquid chamber in the second orifice. Anti-vibration devices are known.
When the vibration generator is driven and shake vibration is input, the opening / closing means closes the opening on the side of the secondary liquid chamber in the second orifice, so that liquid flows through the first orifice and causes liquid column resonance. Thus, the input shake vibration is attenuated and absorbed.
Further, when the vibration generating unit is idling, the opening on the secondary liquid chamber side in the second orifice is not closed by the opening / closing means, so that the liquid flows through the second orifice having a lower flow resistance than the first orifice, and the liquid column resonance occurs. As a result, the input idle vibration is attenuated and absorbed.

JP 2006-300163 A

  However, the conventional vibration isolator has a problem that it cannot absorb and absorb vibration having a frequency higher than that of shake vibration, which is input when the vibration generator is driven.

  The present invention has been made in view of such circumstances, and is a vibration isolator capable of attenuating and absorbing both shake vibrations and vibrations having a higher frequency than the shake vibrations that are input when the vibration generating unit is driven. The purpose is to provide.

In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention includes a cylindrical first attachment member coupled to one of a vibration generating unit and a vibration receiving unit, And a second mounting member connected to the other, an elastic body connecting the two mounting members to each other, a liquid chamber in the first mounting member in which liquid is sealed, and the elastic body as a part of the wall surface. A main liquid chamber and a partition member for partitioning into the sub liquid chamber. The main liquid chamber and the sub liquid chamber communicate with the partition member to cause liquid column resonance with respect to an input of shake vibration. And a second orifice that communicates the main liquid chamber and the sub liquid chamber and causes liquid column resonance with respect to an input of idle vibration, and forms the sub liquid in the second orifice. A vibration isolator having an opening / closing means for opening and closing the opening on the room side, The partition member is formed with a third orifice that communicates the main liquid chamber and the sub liquid chamber and causes liquid column resonance with respect to an input of vibration having a frequency higher than shake vibration, and the third orifice. An elastic blocking plate that closes the opening on the main liquid chamber side in which the third orifice has an annular passage extending in a circumferential direction along an axis of the first mounting member, the annular passage, and the sub liquid chamber And an enclosure tube having an inside formed as the communication hole is formed in the partition member .

According to the present invention, when the vibration generator is driven and shake vibration is input, the opening / closing means closes the opening on the side of the secondary liquid chamber in the second orifice, so that the liquid flows through the first orifice and the liquid column resonance occurs. As a result, the input shake vibration is attenuated and absorbed.
At this time, when vibration having a frequency higher than the shake vibration is input, the elastic blocking plate vibrates, and the liquid in the third orifice flows between the sub liquid chamber and causes liquid column resonance. It becomes.
From the above, it is possible to attenuate and absorb both the shake vibration and the vibration having a higher frequency than the shake vibration that are input when the vibration generating unit is driven.
When the vibration generating unit is idling, the opening on the side of the secondary liquid chamber in the second orifice is not blocked by the opening / closing means, so that the liquid flows through the second orifice having a lower flow resistance than the first orifice and causes liquid column resonance. Thus, the input idle vibration is attenuated and absorbed.

  Here, the second orifice extends along the axial direction of the first mounting member, the first orifice is formed in an outer peripheral portion of the partition member, and the third orifice is formed in the partition member. , And may be formed at a portion located between the second orifice and the first orifice along a radial direction orthogonal to the axis.

  In this case, since the third orifice is formed in the partition member at a portion located between the second orifice and the first orifice along the radial direction, the bulkiness of the partition member due to the formation of the third orifice is increased. Can be suppressed.

  A plurality of the third orifices may be formed.

  In this case, since a plurality of third orifices are formed, desired characteristics can be easily obtained even if the flow path cross-sectional area per third orifice is suppressed, and the bulkiness of the partition member can be reliably suppressed.

  Furthermore, the partition member includes a main surface portion whose front and back surfaces are orthogonal to the axis, the second orifice penetrates the main surface portion in the axial direction, and the plurality of third orifices have the same shape and shape. In addition, the main surface portion may be disposed at a portion located on the outer side in the radial direction from the opening of the second orifice so that the angular position around the axis is different.

  In this case, the plurality of third orifices have the same shape and the same size, and the main surface portion has a different angular position centered on the axis at a portion located radially outside the opening of the second orifice. Since the channel cross-sectional area and the channel length, that is, the resonance frequency in each third orifice are equal to each other, vibration having a frequency higher than the shake vibration is input during the driving of the vibration generating unit. Sometimes, the dynamic spring constant can be reliably suppressed from increasing.

  According to the present invention, it is possible to attenuate and absorb both the shake vibration and the vibration having a higher frequency than the shake vibration that are input when the vibration generator is driven.

In one Embodiment which concerns on this invention, it is a longitudinal cross-sectional view of a vibration isolator. It is a disassembled perspective view of the partition member shown in FIG. It is the perspective view which looked at the partition member main body shown in FIG.1 and FIG.2 from the main liquid chamber side. It is the perspective view which looked at the partition member main body shown in FIGS. 1-3 from the subliquid chamber side.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the vibration isolator 1 includes a cylindrical first mounting member 11 connected to one of a vibration generating unit and a vibration receiving unit, and a second mounting member connected to the other. 12, an elastic body 13 that couples the two attachment members 11, 12 to each other, a liquid chamber in the first attachment member 11 in which a liquid is sealed, and a main liquid chamber having the elastic body 13 as a part of the wall surface. 14, and a partition member 16 that partitions the sub liquid chamber 15.
In the illustrated example, the second mounting member 12 is formed in a column shape, the elastic body 13 is formed in a cylindrical shape, and the first mounting member 11, the second mounting member 12, and the elastic body 13 are coaxial with the common axis. It is arranged. Hereinafter, the common axis is referred to as an axis O, the main liquid chamber 14 side along the axis O direction is referred to as one side, the sub liquid chamber 15 side is referred to as the other side, and the direction orthogonal to the axis O is referred to as the radial direction. A direction around the axis O is referred to as a circumferential direction.

When the vibration isolator 1 is mounted on an automobile, for example, the second mounting member 12 is connected to an engine as a vibration generating unit, while the first mounting member 11 receives vibrations via a bracket (not shown). By being connected to the vehicle body as a part, vibration of the engine is prevented from being transmitted to the vehicle body.
For example, ethylene glycol, water, silicone oil, or the like is sealed in the liquid chamber of the first mounting member 11.

The elastic body 13 is connected in a liquid-tight state to one end of the first mounting member 11, and the opening on the one side of the first mounting member 11 is closed by the elastic body 13. In the first mounting member 11, an annular groove 11 a extending continuously over the entire circumference is formed in a portion that is continuous from the other side with respect to the portion to which the elastic body 13 is connected.
At the other end of the first attachment member 11, a tubular portion 11 b is formed that continuously extends over the entire circumference and bulges outward in the radial direction. The tubular portion 11b opens toward the inner side in the radial direction. The tubular portion 11b has a rectangular shape in a longitudinal sectional view along the axis O direction.

  A diaphragm ring 18 is mounted in a liquid-tight state in the tubular portion 11 b of the first mounting member 11. A diaphragm 17 is fixed to the diaphragm ring 18, and the opening on the other side of the first mounting member 11 is closed by the diaphragm 17. Of the diaphragm 17, the central portion 17a in the radial direction is formed thicker than other portions. At the outer peripheral edge of the central portion 17a of the diaphragm 17, an annular protrusion that protrudes toward one side is formed over the entire circumference. A space surrounded by the diaphragm 17 and the partition member 16 is a sub liquid chamber 15.

  A female threaded portion 12 a is formed coaxially with the axis O on the one end face of the second mounting member 12. The second mounting member 12 protrudes from the first mounting member 11 to one side. The second mounting member 12 is formed with a flange portion 12b that protrudes radially outward and continuously extends over the entire circumference. The flange portion 12 b is separated from one end of the first mounting member 11 to one side.

The elastic body 13 is formed of, for example, a rubber material that can be elastically deformed, and is formed in a cylindrical shape that gradually increases in diameter from one side to the other side. One end of the elastic body 13 is connected to the second mounting member 12, and the other end is connected to the first mounting member 11. The inner peripheral surface of the first mounting member 11 is covered over the entire area by a rubber film formed integrally with the elastic body 13.
Inside the first mounting member 11, an internal stopper 54 that restricts excessive deformation toward the other side of the elastic body 13 is disposed in a portion located between the partition member 16 and the elastic body 13. The internal stopper 54 is formed in a cylindrical shape, and the partition member 16 is disposed inside thereof. One end of the internal stopper 54 is folded back inward in the radial direction. A plurality of through holes are formed at intervals in the circumferential direction in a portion of the internal stopper 54 located on one side of the partition member 16. The internal stopper 54 and the diaphragm ring 18 are integrally formed.

The partition member 16 communicates with the main liquid chamber 14 and the sub liquid chamber 15, and includes a first orifice 21 that causes liquid column resonance in response to shake vibration input, and the main liquid chamber 14 and the sub liquid chamber 15. The second orifice 22 that causes liquid column resonance with respect to the input of idle vibration, the main liquid chamber 14 and the sub liquid chamber 15 communicate with each other, and the liquid column with respect to the input of vibration having a frequency higher than the shake vibration. A third orifice 23 for causing resonance is formed, and an elastic closing plate 24 for closing the opening on the main liquid chamber 14 side in the third orifice 23 is provided.
The liquid column resonance frequency of the first orifice 21 is tuned to a shake vibration frequency (for example, about 10 Hz to 15 Hz). The liquid column resonance frequency of the second orifice 22 is tuned to an idle vibration frequency (for example, about 30 Hz to 60 Hz).
The flow resistance of each of the second orifice 22 and the third orifice 23 is lower than the flow resistance of the first orifice 21. In the present embodiment, the third orifice 23 is tuned to vibration having a frequency equal to or higher than the frequency of idle vibration (for example, about 80 Hz to 100 Hz), and the flow resistance is less than the flow resistance of the second orifice 22. It has become.

This will be specifically described below.
The partition member 16 is disposed between the partition member main body 25 in which the first orifice 21, the second orifice 22 and the third orifice 23 are formed, and the partition member main body 25 disposed on one surface of the partition member main body 25. And a lid plate 26 that accommodates the elastic closing plate 24. The outer diameter of the partition member main body 25 and the outer diameter of the lid plate 26 are equal to each other.
The partition member main body 25 includes an inner cylinder part 27, an outer cylinder part 28 that surrounds the inner cylinder part 27 from the outside in the radial direction, and a ring that connects the other end parts of the inner cylinder part 27 and the outer cylinder part 28 to each other. A plate portion 29 and a main surface portion 30 which is connected to an end portion on one side of the inner cylinder portion 27 and closes an opening portion on one side of the inner cylinder portion 27 are provided.
The inner cylinder part 27, the outer cylinder part 28, the ring plate part 29 and the main surface part 30 are formed integrally as a whole. Further, the front and back surfaces of the main surface portion 30 are orthogonal to the axis O. In the illustrated example, the inner cylinder part 27, the outer cylinder part 28, the ring plate part 29, and the main surface part 30 are arranged coaxially with the axis O.

The first orifice 21 is an annular space surrounded by the inner cylinder part 27, the outer cylinder part 28, and the annular plate part 29, which is located on the outer peripheral part of the partition member 16. As shown in FIGS. 2 and 3, a dividing wall 21 a that divides the extension of the entire circumference of the annular space is disposed in the first orifice 21. The annular plate portion 29 is formed with a sub liquid chamber side opening 41 that allows the first orifice 21 and the sub liquid chamber 15 to communicate with each other at a position shifted in the circumferential direction from the dividing wall 21a. As shown in FIGS. 1 and 2, the first orifice 21 and the main liquid chamber 14 are communicated with the cover plate 26 at a position shifted in the circumferential direction from both the dividing wall 21 a and the auxiliary liquid chamber side opening 41. A main liquid chamber side opening 42 is formed. The sub liquid chamber side opening 41 and the main liquid chamber side opening 42 are adjacent to the dividing wall 21a from both sides in the circumferential direction.
The second orifice 22 passes through the main surface portion 30 of the partition member main body 25 in the direction of the axis O, and extends in the direction of the axis O. In the illustrated example, the second orifice 22 is positioned coaxially with the axis O. The lid plate 26 and the elastic closing plate 24 are formed in an annular shape, and the second orifice 22 and the main liquid chamber 14 communicate with each other through the respective inner openings 26a, 24a.

Here, as shown in FIG. 2 and FIG. 3, a first outer annular protrusion 27 a that protrudes to one side with respect to the main surface part 30 is formed on the entire edge of the end of the inner cylinder part 27 on one side. A first inner annular protrusion 30a that protrudes toward one side is formed on the peripheral edge of the opening of the second orifice 22 in the main surface 30 over the entire circumference.
As shown in FIG. 1, the back surface on the other side of the elastic blocking plate 24 is supported by the edge on one side of each of the first outer annular protrusion 27a and the first inner annular protrusion 30a. A gap (hereinafter referred to as an annular passage) 51 in the axis O direction is formed between the elastic closing plate 24 and the main surface portion 30.
A communication hole 52 that connects the annular passage 51 and the auxiliary liquid chamber 15 is formed in the main surface portion 30. The communication hole 52 extends straight between the annular passage 51 and the auxiliary liquid chamber 15 in the direction of the axis O. The size of the communication hole 52 in the direction of the axis O is larger than the size of the communication hole 52 in the radial direction. Moreover, the planar view shape of the communicating hole 52 becomes a long hole shape extended along the circumferential direction, as FIG.
The third orifice 23 is constituted by the annular passage 51 and the communication hole 52. Thereby, the third orifice 23 is formed in the partition member 16 at a portion located between the second orifice 22 and the first orifice 21 along the radial direction.

  As shown in FIGS. 1 and 4, the main surface portion 30 is formed with a surrounding cylinder 53 that protrudes toward the other side and has an opening that penetrates the main surface portion 30 in the direction of the axis O on the inner side. The inside of the surrounding cylinder 53 is a communication hole 52. Of the inner peripheral edge of the communication hole 52, the portion located at the outer end in the radial direction is connected to the inner peripheral surface of the inner cylinder part 27 without a step, and a part of the inner cylinder part 27 and a part of the surrounding cylinder 53 Match. The other edge of the surrounding cylinder 53 is located on one side of the other edge of the inner cylinder portion 27.

The elastic blocking plate 24 protrudes toward the other side and is fitted into the first inner annular protrusion 30a, and protrudes toward the other side to the first outer annular protrusion 27a. A fitted second outer annular protrusion 24c is formed. The second inner annular protrusion 24 b is disposed at the peripheral edge of the opening 24 a in the elastic closing plate 24, and the second outer annular protrusion 24 c is disposed at the outer peripheral edge of the elastic closing plate 24.
In the lid plate 26, a plurality of window holes 26 b that open toward the surface on one side of the elastic blocking plate 24 are formed at intervals in the circumferential direction at a portion located radially outside the inner opening 26 a. ing.

Here, in the present embodiment, a plurality of third orifices 23 are formed in the partition member 16.
The plurality of third orifices 23 have the same shape and the same size, and the axis O is centered on a portion of the main surface portion 30 of the partition member main body 25 that is located radially outside the opening of the second orifice 22. Are arranged with different angular positions. These third orifices 23 are arranged so as not to overlap the main surface portion 30.
In the example shown in the drawing, the plurality of third orifices 23 are arranged on the main surface portion 30 so as to be rotationally symmetric about the axis O. Openings on the main liquid chamber 14 side of the plurality of third orifices 23 are integrally covered with one elastic blocking plate 24.

This will be specifically described below.
As shown in FIGS. 2 and 3, a plurality of ridge portions 36 that protrude toward one side and extend along the radial direction are formed on the main surface portion 30 at intervals in the circumferential direction. The protruding portion 36 connects the first outer annular protrusion 27 a of the inner cylinder portion 27 and the first inner annular protrusion 30 a of the main surface portion 30. A plurality of third orifices 23 are continuously provided in the circumferential direction via these protrusions 36.
In the illustrated example, two third orifices 23 are formed in the partition member 16, and the protrusion 36 sandwiches the opening of the second orifice 22 in the radial direction in a plan view on one surface of the main surface portion 30. Two are formed so as to be located on the same straight line. The annular passage 51 has a C-shaped plan view. The communication hole 52 is disposed at the center portion in the circumferential direction of the annular passage 51 and at the outer end portion in the radial direction.

Here, the vibration isolator 1 includes an opening / closing means 31 that closes the opening of the second orifice 22 on the side of the secondary liquid chamber 15 when the vibration generating unit is driven and opens the idling of the vibration generating unit.
For example, when the vibration generating unit is an engine, the opening / closing means 31 may close the opening on the side of the secondary liquid chamber 15 in the second orifice 22 when a predetermined rotation speed is exceeded.
The opening / closing means 31 is formed with a supply / discharge passage 61 connected to a supply / discharge means (not shown), a substrate portion 62 disposed at a position away from the diaphragm 17, and the substrate portion 62 and the diaphragm 17. The expansion / contraction film 63 that forms an airtight expansion / contraction space between the substrate portion 62 and the expansion / contraction film 63 is biased toward one side so that the central portion 17a of the diaphragm 17 is separated from the partition member 16. And an urging means 64 that presses toward the opening peripheral edge of the second orifice 22 in the main surface portion 30.

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

First, at the time of idling of the vibration generating portion, an urging force directed toward one side of the urging means 64 by exhausting the inside of the expansion / contraction film 63 through the supply / exhaust passage 61 to make negative pressure in the expansion / contraction film 63 by an unillustrated supply / exhaust means. Against this, the expansion / contraction film 63 is contracted, and the push-up toward the diaphragm 17 by the expansion / contraction film 63 is released. Thereby, the pressing toward the main surface 30 of the partition member 16 by the diaphragm 17 is released, and the opening of the second orifice 22 toward the sub liquid chamber 15 is opened.
Then, the liquid flows through the second orifice 22 whose flow resistance is lower than that of the first orifice 21 to cause liquid column resonance, and the input idle vibration is attenuated and absorbed.

On the other hand, when the vibration generator is driven and shake vibration is input, the inside of the expansion / contraction film 63 is returned to the atmospheric pressure by supplying air into the expansion / contraction film 63 through the supply / discharge passage 61, for example. The expansion / contraction film 63 is expanded by an urging force directed toward one side, whereby the central portion 17a of the diaphragm 17 is pushed up toward the one side by the expansion / contraction film 63. Thus, the central portion 17a of the diaphragm 17 is pressed against the opening peripheral edge portion of the second orifice 22 in the main surface portion 30, and the opening of the second orifice 22 toward the sub liquid chamber 15 is closed.
Then, the liquid flows through the first orifice 21 to cause liquid column resonance, and the input shake vibration is attenuated and absorbed.
Further, at this time, when vibration having a frequency higher than the shake vibration is input, the elastic blocking plate 24 vibrates, so that the liquid in the third orifice 23 flows between the sub liquid chamber 15 and the liquid column resonance occurs. The generated vibration is attenuated and absorbed.

As described above, according to the vibration isolator 1 according to the present embodiment, it is possible to attenuate and absorb both the shake vibration and the vibration having a higher frequency than the shake vibration that are input when the vibration generating unit is driven.
Moreover, since the 3rd orifice 23 is formed in the part located in the partition member 16 between the 2nd orifice 22 and the 1st orifice 21 along a radial direction, the partition by having formed the 3rd orifice 23 The bulkiness of the member 16 can be suppressed.
Further, since a plurality of third orifices 23 are formed, it is easy to obtain desired characteristics even if the flow passage cross-sectional area of each third orifice 23 is suppressed, and it is possible to reliably suppress bulkiness of the partition member. it can.

In addition, the plurality of third orifices 23 have the same shape and the same size, and an angle with the axis O as the center at a portion of the main surface portion 30 located outside the opening of the second orifice 22 in the radial direction. Since they are arranged at different positions, the flow path cross-sectional area and flow path length, that is, the resonance frequency in each of the third orifices 23 are equal to each other, and vibration with a frequency higher than the shake vibration is generated during driving of the vibration generating unit. It is possible to reliably prevent the dynamic spring constant from becoming high when.
Furthermore, in the present embodiment, since the plurality of third orifices 23 are arranged in the main surface portion 30 in rotational symmetry about the axis O, the rigidity of the elastic closing plate 24 is such that the rigidity of the plurality of third orifices 23 is the main liquid chamber. It is possible to suppress variation at each portion that closes each opening on the 14 side, and the resonance frequencies of the plurality of third orifices 23 can be easily equalized.

  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 embodiment, two third orifices 23 are formed in the partition member 16, but three or more or one may be formed.
When the number of the third orifices 23 is one, both the two protrusions 36 are not formed, and one of the two communication holes 52 may not be formed, or one side of the main surface portion 30 may be formed. The entire surface of one of the two annular passages 51 may be filled by providing a protruding portion having the same shape and size as the annular passage 51 on the surface.

In the above embodiment, the elastic blocking plate 24 is supported by the first inner annular protrusion 30a formed on the main surface portion 30 and the first outer annular protrusion 27a formed on the inner cylinder portion 27. Instead, for example, the second inner annular protrusion 24b and the second outer annular protrusion 24c formed on the elastic closing plate 24 without forming the first inner annular protrusion 30a and the first outer annular protrusion 27a. You may change suitably, such as mounting the edge of the other side in each on the surface of the one side in the main surface part 30. FIG.
Further, the first inner annular protrusion 30a of the main surface part 30 and the second inner annular protrusion 24b of the elastic blocking plate 24 may be abutted in the direction of the axis O, or the first outer annular part of the inner cylinder part 27 The protrusion 27a and the second outer annular protrusion 24c of the elastic blocking plate 24 may be butted in the direction of the axis O.
In addition, the form of the partition member 16 is not restricted to the said embodiment, You may change suitably.
In the above-described embodiment, the description has been given of the case where the engine is connected to the second mounting member 12 and the first mounting member 11 is connected to the vehicle body. However, the engine may be configured to be connected in reverse. You may install a vibration isolator in a vibration generation part and a vibration receiving part.

  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 Anti-vibration device 11 1st attachment member 12 2nd attachment member 13 Elastic body 14 Main liquid chamber 15 Sub liquid chamber 16 Partition member 21 1st orifice 22 2nd orifice 23 3rd orifice 24 Elastic block plate 30 Main surface part 31 Opening and closing means O axis

Claims (4)

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;
An elastic body for connecting these two mounting members to each other;
A partition member that partitions the liquid chamber in the first mounting member in which the liquid is enclosed into a main liquid chamber having the elastic body in a part of a wall surface, and a sub liquid chamber;
With
In the partition member,
A first orifice communicating the main liquid chamber and the sub liquid chamber and causing liquid column resonance in response to an input of shake vibration;
A second orifice communicating the main liquid chamber and the sub liquid chamber and causing liquid column resonance in response to an input of idle vibration;
Formed,
An anti-vibration device comprising an opening / closing means for opening / closing an opening on the side of the secondary liquid chamber in the second orifice,
In the partition member,
A third orifice is formed which communicates the main liquid chamber and the sub liquid chamber and causes liquid column resonance with respect to an input of vibration having a frequency higher than shake vibration.
An elastic closing plate for closing the opening on the main liquid chamber side in the third orifice ;
The third orifice is constituted by an annular passage extending in the circumferential direction along the axis of the first mounting member, and a communication hole communicating the annular passage and the sub liquid chamber.
An antivibration device characterized in that an encircling cylinder whose inside is the communication hole is formed in the partition member . The vibration isolator according to claim 1,
The second orifice extends along an axial direction of the first mounting member;
The first orifice is formed on the outer periphery of the partition member;
The third orifice is formed in a portion of the partition member that is located between the second orifice and the first orifice along a radial direction orthogonal to the axis. A vibration isolator according to claim 2,
A plurality of the third orifices are formed. A vibration isolator according to claim 3,
The partition member includes a main surface portion whose front and back surfaces are orthogonal to the axis,
The second orifice penetrates the main surface portion in the axial direction,
The plurality of third orifices have the same shape and the same size, and the angular positions around the axis are different in a portion of the main surface portion that is located radially outside the opening of the second orifice. An anti-vibration device characterized by being arranged.

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