JP6389046B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator.

  In the conventional vibration isolator, an elastic body that allows relative displacement between the inner member and the outer cylinder member is closed as one end of the outer cylinder member, and a first main liquid chamber configured as a part of the partition wall. A sub-liquid chamber in which a diaphragm is configured as a part of a partition and is connected to the first main liquid chamber via a first passage, and the elastic body facing the inner peripheral side of the outer cylinder member is configured as a part of the partition And a second liquid chamber connected to the auxiliary liquid chamber via a second passage (for example, see Patent Document 1). The vibration isolator is further provided with a movable plate between the first main liquid chamber and the sub liquid chamber.

JP 2006-125617 A

  The vibration isolator has a frequency of 10 to 15 Hz for vibration (bounce vibration) having a frequency of less than 10 Hz, while absorbing vibration by setting the first passage connecting the first liquid chamber and the sub liquid chamber. As for vibration (pitching vibration), vibration absorption is achieved by setting a second passage connecting the second liquid chamber and the sub liquid chamber, and further, the vibration is arranged between the first main liquid chamber and the sub liquid chamber. The movable plate can effectively absorb high-frequency vibrations by suppressing an increase in the dynamic spring constant associated with an increase in the hydraulic pressure in the first liquid chamber.

  However, although the vibration isolator can control the resonance generated in the first main liquid chamber by the specifications of the movable plate (for example, size and rubber hardness), the adjustment of other liquid chambers Control is possible only by the first and second passages and the diaphragm. Therefore, it is conceivable to adjust the shape of the second passage so as to cope with vibrations in a wide frequency band, but the shape design of the second passage is limited due to a problem in the design area. In addition, although it is conceivable to adjust the sub liquid chamber leading to the second liquid chamber, the shape design of the diaphragm configured as a part of the partition wall of the sub liquid chamber is also a problem of the design area and durability. There is a limit.

  It is an object of the present invention to provide a vibration isolator having a high degree of design freedom so that it can cope with vibrations in a wide frequency band.

The vibration isolator of the present invention includes an inner member connected to one of the vibration generating portion and the vibration receiving portion, an outer cylinder member connected to the other of the vibration generating portion and the vibration receiving portion, the inner member, and the An elastic body that is arranged between the outer cylinder member and allows relative displacement between the inner member and the outer cylinder member by elastic deformation, and at least the elastic body is configured as a part of the partition wall and can be expanded and contracted A first main liquid chamber, a diaphragm which can be elastically deformed by closing one end of the outer cylinder member, and at least the diaphragm is configured as a part of a partition wall and is connected to the first main liquid chamber via a first passage. A second liquid chamber is disposed at a position facing the inner peripheral side of the outer cylinder member, and at least the elastic body is configured as a part of a partition wall and is connected to the sub liquid chamber via a second passage. A main liquid chamber, and the outer cylinder member The and opening is formed on at least a portion of the second region that forms the main liquid chamber, and wherein the closing of the opening in which comprises a resilient deformable membrane.
According to the vibration isolator of the present invention, for example, since an increase in internal pressure in the second liquid chamber can be directly suppressed, vibrations in a wide range of frequency bands can be handled.

In the vibration isolator of the present invention, it is preferable that the membrane has an outer surface that is flush with the outer peripheral surface of the outer cylinder member or that is positioned radially inward from the outer peripheral surface of the outer cylinder member. .
In this case, since the membrane does not protrude outward from the opening, the outer cylinder member can be easily press-fitted when used by being press-fitted into a bracket.

In the vibration isolator of the present invention, preferably, the outer cylinder member includes a bracket into which the outer cylinder member is press-fitted.
In this case, the membrane can be adjusted by using the bracket.

In the vibration isolator according to the aspect of the invention, it is preferable that the bracket is arranged such that at least a part of the opening is disposed on the radially inner side.
In this case, the membrane can be adjusted while protecting the membrane.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration isolator with a high design freedom can be provided so that it can respond to the vibration of a wide frequency band.

It is a side view which shows the engine mount which is one Embodiment of the vibration isolator of this invention. It is II sectional drawing which shows the engine mount of FIG. (A) is an expanded sectional view which shows the area | region X of Fig.2 (a), (b) is an expanded sectional view which shows the state which press-fit the bracket to the outer cylinder member of (a). (A) is an expanded sectional view showing other examples of a membrane used for a vibration isolator of the present invention typically with a bracket and an auxiliary member, and (b) is a membrane further used for the present invention. It is an expanded sectional view showing other examples typically.

  Hereinafter, an engine mount which is an embodiment of the vibration isolator of the present invention will be described in detail with reference to the drawings. In the following description, the upper side and the lower side of the drawing are described as the upper side and the lower side, respectively. In this embodiment, the engine-side member is a vibration generating unit, and the chassis (vehicle body) -side member is a vibration receiving unit.

  In FIG. 1, reference numeral 1 denotes an engine mount, which is an embodiment of the vibration isolator of the present invention. Reference numeral 2 denotes an inner member connected to the engine side member. The inner member is a metal member, for example. In the present embodiment, the inner member 2 includes a round bar-like large-diameter portion 2a, a round-bar-like small-diameter portion 2b extending upward from the large-diameter portion 2a, and an annular protrusion 2c that circulates around the outer peripheral surface of the large-diameter portion 2a. Consists of. In this embodiment, as shown in FIG. 2, the inner member 2 is a solid member, but the inner member 2 is not limited to a solid member. For example, the inner member 2 includes a hollow cylindrical member.

  Reference numeral 3 denotes an outer cylinder member connected to the chassis side member. The outer cylinder member 3 is a metal member, for example. In the present embodiment, the outer cylinder member 3 includes a cylindrical barrel portion 3a, an annular step portion 3b whose lower side is reduced radially inward, and the annular step portion 3b on the lower side. The aperture portion 3c has a diameter reduced as it goes. Moreover, in this embodiment, 3 d of opening outer peripheral surfaces of the upper side of the trunk | drum 3a are formed as a taper surface.

  Reference numeral 4 denotes a diaphragm that can be elastically deformed by closing one end of the outer cylinder member 3. The diaphragm 4 is, for example, a rubber film member that can be deformed and restored. In the present embodiment, the diaphragm 4 closes an opening formed inside the throttle portion 3 c of the outer cylinder member 3. That is, in this embodiment, the diaphragm 4 closes the opening formed at the lower end of the outer cylinder member 3.

  Reference numeral 5 denotes an elastically deformable sealing rubber disposed on the inner peripheral surface of the outer cylinder member 3. The sealing rubber 5 is, for example, a rubber film member that can be deformed and restored. In the present embodiment, the sealing rubber 5 is formed integrally with the diaphragm 4. For example, the sealing rubber 5 is vulcanized and bonded to the inner peripheral surface of the outer cylinder member 3 together with the diaphragm 4. Thereby, the sealing rubber 5 seals the inner peripheral surface of the outer cylinder member 3.

  Reference numeral 6 denotes a partition member disposed inside the outer cylinder member 3. The partition member 6 is disposed above the diaphragm 4. In the present embodiment, the partition member 6 integrally includes a main body portion 6a that partitions the outer cylinder member 3 and a peripheral wall portion 6b that extends upward from the outer edge of the main body portion 6a. Moreover, in this embodiment, the partition member 6 has the sealing part 6c which closes the upper surface of the main-body part 6a enclosed by the surrounding wall part 6b. In the present embodiment, the partition member 6 is connected to the inside of the outer cylinder member 3 via the sealing rubber 5 to partition the inside of the outer cylinder member 3 in the vertical direction.

  Reference numeral 7 denotes an elastic body that is disposed between the inner member 2 and the outer cylinder member 3 and enables relative displacement between the inner member 2 and the outer cylinder member 3 by elastic deformation. The elastic body 7 is, for example, a rubber member that can be deformed and restored. The elastic body 7 is formed to circulate around the inner member 2 around the axis O so as to close an annular gap formed between the inner member 2 and the outer cylinder member 3.

  Specifically, the upper side of the elastic body 7 is arranged with an intermediate large-diameter tube 8 that circulates around the inner member 2 around the axis O so as to surround the inner member 2, and the inner peripheral surface of the intermediate large-diameter tube 8. And vulcanized and bonded to the outer peripheral surface of the large-diameter portion 2a of the inner member 2. The lower side of the elastic body 7 is vulcanized and bonded to the inner peripheral surface of the intermediate small-diameter cylinder 9 having a smaller diameter than the intermediate large-diameter cylinder 8.

  Also, a bottom-up surface 7 a that is recessed in a dome shape that tapers upward as it goes radially inward is formed at the lower end of the elastic body 7. Further, the outer peripheral surface of the elastic body 7 is formed between the intermediate large diameter tube 8 and the intermediate small diameter tube 9 with two concave surfaces 7b and 7c recessed toward the inner member 2 with an interval around the axis O. ing.

  The elastic body 7 connects the inner member 2 and the outer cylinder member 3 via the intermediate large-diameter cylinder 8 and the sealing rubber 5 on the upper side, and on the lower side, the intermediate small-diameter cylinder 9, the partition member 6 and The inner member 2 and the outer cylinder member 3 are coupled via the sealing rubber 5. Thereby, the inner member 2 and the outer cylinder member 3 are elastically connected by the elastic body 7. In the present embodiment, the elastic body 7 is formed so that the inner member 2 and the outer cylinder member 3 are on concentric axes. That is, in the present embodiment, the central axis of the inner member 2 is configured to be the same axis O as the central axis of the outer cylinder member 3.

Reference numeral S ₁ denotes a first main liquid chamber in which the elastic body 7 is configured as a part of the partition wall and can be expanded and contracted. In the present embodiment, the first main liquid chamber S ₁ is formed with the raised surface 7 a of the elastic member 7 and the upper end surface of the partition member 6 as partition walls. As a result, the volume of the first main liquid chamber S ₁ expands / contracts (expands / contracts) in accordance with the deformation of the elastic body 7.

Reference numeral S ₂ denotes a second main liquid chamber that is disposed at a position facing the inner peripheral side of the outer cylinder member 3 and in which the elastic body 7 is configured as a part of the partition wall. The second main liquid chamber S ₂ can basically be formed by using the outer cylinder member 3 and the elastic body 4 as partition walls, but in the present embodiment, the second main liquid chamber S ₂ is formed by the sealing rubber 5 and the elastic body 7. . More specifically, the second main liquid chamber S ₂ is the inner peripheral surface of the sealing rubber 5, the second main liquid chamber S ₂ of one that is shaped and concave 7b formed in the elastic body 7 as a partition surface , forming the inner peripheral surface of the sealing rubber 5, and a concave 7c formed in the elastic member 7 of the second main liquid chamber S ₂ other that is shaped as a partition wall surface, as the two second main liquid chamber S ₂ Has been. Accordingly, the two second main liquid chambers S ₂ expand and contract according to the deformation of the elastic body 7 and the sealing rubber 5, respectively.

Reference numeral S ₃ is a sub-liquid chamber in which the diaphragm 4 is configured as a part of the partition wall. In the present embodiment, the auxiliary liquid chamber S ₃ is formed with the inner peripheral surface of the diaphragm 4 and the lower end surface of the partition member 6 as partition walls. Thereby, expansion / contraction of the auxiliary liquid chamber S ₃ is allowed by deformation of the diaphragm 4.

  Furthermore, in the present embodiment, the partition member 6 is formed with the first passage 100, the second passage 200, and the pressure adjustment unit 300.

The first passage 100 has an opening 101 formed in the sealing portion 6c, and an orifice that spirally extends around the axis O formed between the main body 6a and the sealing portion 6c through the opening 101. The passage 102 and the opening 103 formed in the lower end surface of the main body 6a through the orifice passage 102 are formed. The first passage 100 is a passage that connects the first main liquid chamber S ₁ and the sub liquid chamber S ₃ . Inside the first passage 100, to permit flow of fluid between the first main liquid chamber S ₁ and the auxiliary liquid chamber S _3. In the illustrated example, vibration of a relatively low frequency and large amplitude, for example, vibration having a frequency of less than 10 Hz (bounce vibration) can be absorbed mainly by setting the first passage 100.

The second passage 200 has an opening 201 formed on the upper end surface of the peripheral wall 6b, an axis formed between the peripheral edge 6b and the outer edge of the main body 6a and the sealing rubber 5 through the opening 201. An orifice passage 202 that spirally extends around O in the direction of the axis O and an opening 203 formed on the lower end surface of the main body 6a through the orifice passage 202 are formed. The second passage 200 is a passage connecting the second main liquid chamber S ₂ and the sub liquid chamber S ₃ . Inside the second passage 200, to permit flow of fluid between the second main liquid chamber S ₂ and the auxiliary liquid chamber S _3. In the illustrated example, the cross-sectional area of the second passage 200 is set larger than the cross-sectional area of the first passage 100. As a result, vibration absorption (pitching vibration) having a frequency higher than that of the bounce vibration, for example, a frequency of 10 to 15 Hz can be absorbed by setting the second passage 200.

In addition, the 2nd channel | path 200 can absorb not only the vibration of an up-down direction but the vibration of the front-back direction (drawing left-right direction). Further, in the present embodiment, the second passage 200, the two second main liquid chamber are provided in both the S _2. That is, the two second main liquid chambers S ₂ are independently connected to the sub liquid chamber S ₃ via different second passages 200.

The pressure adjusting unit 300 includes an opening 301 formed in the sealing portion 6 c, a storage portion 302 formed between the main body 6 a and the sealing portion 6 c through the opening 301, and the storage portion 302. Is formed with an opening 303 formed in the main body portion 6 a that communicates with the lower end surface of the main body portion 6. Further, the movable plate M is housed inside the housing portion 302 so as to be minutely deformed or movable (in this embodiment, minutely deformed). The movable plate M can be slightly deformed or moved in the vertical direction inside the accommodating portion 302. The movable plate M makes it possible to effectively absorb high-frequency vibrations by suppressing an increase in the dynamic spring constant associated with an increase in the hydraulic pressure in the first main liquid chamber S ₁ .

Further, in this embodiment, the outer cylinder member 3, the opening A is formed on at least part of the region forms one of the second main liquid chamber S _2. The opening A is closed by the sealing rubber 5 so that the second main liquid chamber S ₂ cannot communicate with the outside of the outer cylinder member 3. In the present embodiment, as shown in FIG. 3A, the sealing rubber 5 has an outer surface 5 f located on the radially inner side with respect to the outer peripheral surface ₃ f ₃ of the outer cylinder member 3. More specifically, in this embodiment, the outer surface 5f of the sealing rubber 5, forming the inner circumferential surface 3f ₁ flush the outer cylinder member 3 (the same surface). That is, in the present embodiment, the outer surface 5 f of the sealing rubber 5 is radially inward from the outer peripheral surface 3 f ₂ of the outer cylinder member 3 by the thickness t of the body portion 3 a.

Sealing rubber 5 for closing the opening portion A, when the pressure in the second main liquid chamber S ₂ rises, by deforming radially outwards, release the internal pressure to rise in the second main liquid chamber S ₂ be able to. Further, the sealing rubber 5 for closing the opening A, after venting of the pressure rise in the second main liquid chamber S _2, by deforming radially inward, restores to the original state. Similarly, the sealing rubber 5 for closing the opening portion A, when the pressure in the second main liquid chamber S ₂ is lowered, by deforming radially inward, decreases at the second main liquid chamber S ₂ The internal pressure (negative pressure) can be released. Further, the sealing rubber 5 for closing the opening A, after venting of the pressure reduced by the second main liquid chamber S _2, by deforming radially inward, restores to the original state.

That is, the sealing rubber 5 that closes the opening A functions as a membrane according to the present invention that can be elastically deformed by closing the opening A. Thus, the sealing rubber 5 for closing the opening A, since the suppressed directly increase of the pressure in at least a second main liquid chamber S _2, can correspond to vibration over a wide range of frequency bands. Therefore, the sealing rubber 5 that closes the opening A suppresses an increase in the dynamic spring constant associated with an increase in the hydraulic pressure in the second main liquid chamber S ₂ , and thus, with the movable plate M disposed in the pressure adjustment unit 300, the sealing rubber 5 Allows effective absorption of.

Thus, if the opening A of the outer cylinder member 3 formed in the region forming the second main liquid chamber S ₂ is closed with the sealing rubber 5 and the sealing rubber 5 closing the opening A is used as a membrane, Just as the pressure increase in the first main liquid chamber S ₁ is directly suppressed by adjusting the first passage 100 and the movable plate M, the pressure increase in the second main liquid chamber S ₂ Since it can be directly suppressed by adjusting the sealing rubber 5, it can cope with vibrations in a wide frequency band. Therefore, the engine mount 1 of the present embodiment is a vibration isolator having a high degree of design freedom so that it can cope with vibrations in a wide frequency band.

In particular, like the sealing rubber 5 of the present embodiment, the outer surface 5f of the sealing rubber 5 that closes the opening A is flush with the outer peripheral surface 3f ₂ of the outer cylindrical member 3, or the outer peripheral surface of the outer cylindrical member 3 it is preferred to 3f ₂ is an outer surface located on the inside. In this case, since the sealing rubber 5 that closes the opening A does not protrude from the opening A, the outer cylinder member 3 can be easily press-fitted when used by being pressed into the bracket 20 as described later.

Moreover, in this invention, it is preferable to provide the bracket 20 by which the outer cylinder member 3 is press-fitted inside. FIG. 3B shows a state where the outer cylinder member 3 is press-fitted into the bracket 20 and the opening A is disposed inside the bracket 20. Thus, when the bracket 20 arranges the whole opening A inside, the opening A in which the whole radial inner side was closed by the sealing rubber 5 can be sealed by the bracket 20. In this case, it is possible to protect the sealing rubber 5 by a bracket 20, as hardly deformed with respect to the second main liquid chamber pressure rise of S _2, the sealing rubber 5 for closing the opening A, apparently, the membrane stiffer Can be adjusted. When a part of the opening A is disposed inside the bracket 20, at least a part of the opening A is opened to the outside. That is, when the bracket 20 is disposed with a part of the opening A inside, the outer surface 5 f of the sealing rubber 5 that closes the opening A is opened to the outside through the opening A. In this case, the sealing rubber 5 that closes the opening A is easily deformed in the radial direction, as in FIG. 3A, and can be adjusted to a soft membrane in appearance compared to the case of the sealing. . For this reason, the internal pressure of the second main liquid chamber S ₂ can be easily released while protecting the sealing rubber 5 that closes the opening A.

  If the bracket 20 is used as in this embodiment, the sealing rubber 5 as a membrane can be adjusted. In particular, as described above, if the bracket 20 is arranged so that at least a part of the opening A is disposed on the inside, the sealing rubber 5 functioning as a membrane can be protected and the sealing rubber 5 as the membrane can be adjusted. .

In this embodiment, of the two second main liquid chambers S ₂ , the opening A is formed only in one outer cylinder member 3 and the sealing rubber 5 has a membrane function. also forms an opening a in the outer cylinder member 3 corresponding to the chamber S _2, it is also possible to have a membrane function the opening a closed sealing rubber 5. As a modification of the present embodiment, one of the two second main liquid chambers S ₂ can be configured as an air chamber. The second main liquid chamber S ₂ of the two is also possible to second main liquid chamber S ₂ of one made to communicate with each other.

  In addition, the membrane according to the vibration isolator of the present invention is not limited to the one configured as the sealing rubber 5, and examples include those shown in FIGS. 4 (a) and 4 (b). In the following description, substantially the same parts as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 4 (a), the code | symbol 10 is another membrane which concerns on the vibration isolator of this invention. The membrane 10 is, for example, a rubber member. The membrane 10 is formed inside an opening A formed in the outer cylinder member 3. Specifically, in this example, the inner surface 10f ₁ of the membrane 10 is flush with the inner peripheral surface 3f ₁ of the outer cylinder member 3 (the same surface). Further, the outer surface 10f ₂ of the membrane 10 is flush with the outer peripheral surface 3f ₂ of the outer cylinder member 3 (same surface). For example, the membrane 10 is vulcanized and bonded to the outer cylinder member 3.

In this example, the bracket 20 has a recessed surface 20f formed inside thereof. In this case, when the outer cylinder member 3 is press-fitted into the bracket 20, the outer peripheral surface 3 f ₂ of the outer cylinder member 3 and the outer surface 10 f _{2 of the} membrane 10 and the recessed surface of the bracket 20 are between the outer cylinder member 3 and the bracket 20. sealing chamber S ₄ that the 20f and the partition wall surface is formed. Thereby, even when the outer surface 10f ₂ of the membrane 10 is the same as the outer peripheral surface 3f ₂ of the outer cylinder member 3, the same adjustment as when the sealing rubber 5 for closing the opening A is used as the membrane is possible. In this example, a sealed chamber S ₄ is formed between the outer cylinder member 3 and the bracket 20. However, by opening a part of the bracket 20, the sealed chamber S ₄ is communicated with the outside world. Is also possible.

Further, in this example, a protruding portion 20a that protrudes radially inward from the recessed surface 20f is provided inside the bracket 20. In addition, in this example, the auxiliary member 30 is disposed inside the outer cylinder member 3. The auxiliary member 30 is provided with a contact portion 30 a at a position aligned with the opening A formed in the outer cylinder member 3. Further, in this example, the inner surface 10f ₁ of the membrane 10 is provided with a protrusion 10p ₁ protruding inward in the radial direction. Further, the outer surface 10f ₂ of the membrane 10 is provided with a protrusion 10p ₂ protruding outward in the radial direction. In this case, the displacement of the membrane 10 on the outer side in the radial direction is limited by the protrusion 10p ₂ contacting the protrusion 20a. Further, the displacement of the membrane 10 on the inner side in the radial direction is limited by the protrusion 10p ₁ coming into contact with the contact portion 30a. In this case, the projection 10p _{2 of the} membrane 10 and the protruding portion 20a of the bracket 20 and the projection 10p _{1 of the} membrane 10 and the abutting portion 30a of the auxiliary member 30 function as a stopper, thereby making the function of the membrane 10 constant. By restricting to this range, an excessive decompression effect can be prevented.

  Further, FIG. 4B shows still another example of the membrane 10. In the following description, parts that are substantially the same as those shown in FIGS. 1 to 3 have the same reference numerals, and the description thereof is omitted. In this example, the membrane 10 is formed with a bending point 10a by being bent so as to protrude outward in the radial direction. If the bending point 10a is formed in the membrane 10 in this manner, the rigidity of the membrane 10 can be controlled without changing the thickness of the membrane 10, for example, as shown in FIG. 4B. Also in this example, the bending point 10a can function as a part of the stopper. In this case, as in the embodiment of FIG. 4A, the excessive pressure reduction effect can be prevented by limiting the function of the membrane 10 to a certain range. In the present embodiment, a plurality of bending points 10a are provided. However, the present invention is not limited to this, and at least one bending point 10a can be provided.

  What has been described above describes exemplary embodiments of the present invention, and various modifications can be made without departing from the scope of the claims. For example, in this embodiment, the engine side is connected to the inner member as the vibration generating side, and the chassis side is connected to the outer cylinder member as the vibration receiving side, but this may be reversed. Further, by mounting the vehicle in the upside down direction with respect to the present embodiment, the inner member 2 is connected with the chassis side as the vibration generating portion, while the outer cylinder member 3 is connected with the engine side as the vibration receiving portion. it can. In addition to the engine mount, the vibration isolator of the present invention can be used, for example, to support the automatic transmission on the vehicle body. The configurations of the above-described embodiments can be appropriately replaced with each other or combined.

  The present invention relates to a vibration isolator that restricts the movement of an inner member connected to one of a vibration generator and a vibration receiver and an outer cylinder member connected to the other of the vibration generator and the vibration receiver with an elastic body. If there is, it can be applied to various vibration isolators.

DESCRIPTION OF SYMBOLS 1 Engine mount 2 Inner member 3 Outer cylinder member 4 Diaphragm 5 Sealing rubber (membrane)
6 Partition member 7 Elastic body 8 Medium large diameter tube 9 Medium small diameter tube 10 Membrane 20 Bracket 100 First passage 200 Second passage 300 Pressure adjusting portion A Opening portion S ₁ First main liquid chamber S ₂ Second main liquid chamber S ₃ Secondary liquid chamber

Claims (6)

An inner member coupled to one of the vibration generator and the vibration receiver;
An outer cylinder member coupled to the other of the vibration generating portion and the vibration receiving portion;
An elastic body that is disposed between the inner member and the outer cylinder member and enables relative displacement between the inner member and the outer cylinder member by elastic deformation;
A first main liquid chamber in which at least the elastic body is configured as a part of a partition wall and can be expanded and contracted;
A diaphragm capable of elastically deforming by closing one end of the outer cylinder member;
A sub liquid chamber in which at least the diaphragm is configured as a part of a partition wall and connected to the first main liquid chamber via a first passage;
A second main liquid chamber disposed at a position facing the inner peripheral side of the outer cylinder member, wherein at least the elastic body is configured as a part of a partition wall and is connected to the sub liquid chamber via a second passage. In addition,
An opening is formed in at least a part of a region forming the second main liquid chamber of the outer cylinder member, and includes a membrane that can be elastically deformed by closing the opening, and
A bracket is arranged on the outside of the outer cylinder member, and a protruding portion is provided on the inside of the bracket so as to protrude radially inward and restrict displacement of the membrane on the outside in the radial direction. Anti-vibration device. The vibration isolator according to claim 1, wherein an auxiliary member is disposed inside the outer cylinder member, and the auxiliary member is provided with a contact portion that restricts a radial inner displacement of the membrane.   The vibration isolator according to claim 1 or 2, wherein a bending point protruding radially outward is formed on the membrane.   4. The membrane according to claim 1, wherein the membrane has an outer surface that is flush with an outer peripheral surface of the outer cylinder member or located radially inward of the outer peripheral surface of the outer cylinder member. A vibration isolator.   The vibration isolator according to any one of claims 1 to 4, further comprising a bracket into which the outer cylinder member is press-fitted inward.   6. The vibration isolator according to claim 5, wherein the bracket arranges at least a part of the opening at a radially inner side.

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