JPH11108107A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a rubber material from projecting by suppressing exfoliation between an elastic body and inside members. SOLUTION: A circumferential surface of a rubber elastic body 18 is glued in the vulcanized state on the inner circumferential surface of an outer-cylinder metal fitting 16, and an inner-cylinder metal fitting 24 is glued and buried in the vulcanized state in the center of the elastic body 18 installed on the inner circumferential side of the outer-cylinder metal fitting 16, and also the upper tip of the inner cylinder metal fitting 24 is projected from the elastic body 18. A concave part 25 having a cylindrical hollow shape is installed on the lower edge surface forming the edge of one side of the inner-cylinder metal fitting 24, and the part along the inner circumferential wall of the concave part 25 is thinly coated with the elastic body 18. A strain-concentrating part 18B having a hollow shape is installed circularly on the part of the elastic body 18 in the periphery of the inner cylinder metal fitting 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for preventing transmission of vibration from a vibration generating section, and more particularly to a mount for supporting a member such as an engine which generates vibration. Applicable.

[0002]

2. Description of the Related Art For example, a vibration isolator as an engine mount is provided between an engine serving as a vibration generating portion of a vehicle and a vehicle body serving as a vibration receiving portion. Is absorbed and is prevented from being transmitted to the vehicle body.

As one example, a vibration isolator 110 as shown in FIG. 6 is known and will be described below.

[0004] As shown in these figures, this vibration isolator 1
10 outer cylinder fitting 120 and inner cylinder fitting 116 as an inner member
An elastic body 118 made of rubber is vulcanized and adhered to these metal fittings, and a liquid chamber 114 filled with liquid by using the elastic body 118 as a part of a wall surface is formed in the outer cylindrical metal fitting 12.
0 is provided.

[0005] Then, the elastic body 118 is attached to the inner cylinder fitting 11.
In the case of vulcanization bonding to 6, the inner cylinder fitting 116 is arranged in the vulcanization mold so that the upper end surface of the inner cylinder fitting 116 is in contact with a vulcanization mold (not shown) for vulcanization molding of a rubber material. A rubber material is injected from the lower end surface side of the inner cylinder fitting 116 and vulcanized and bonded. At this time, the inner cylinder fitting 1 is attached to the vulcanization mold by the injection pressure of the rubber material.
16 is pressed against the upper end surface of the inner tube fitting 116 to prevent the rubber material from protruding from the elastic body 118.

[0006]

However, in the structure of the conventional vibration isolator 110 described above, the upper end surface of the inner cylinder 116 depends on the dimensional accuracy of the inner cylinder 116 and the flow of the rubber material. The rubber material could not be sufficiently prevented from protruding.

In other words, in the current manufacturing process of the vibration isolator, only the upper end surface, which is one surface of the inner cylinder 116, is pressed by a vulcanizing mold when the elastic body 118 is vulcanized and bonded. There was a possibility that the rubber material would protrude from the end face.

[0008] On the other hand, it is conceivable to provide a support portion for holding with a vulcanizing mold on each of the upper and lower portions of the inner cylindrical fitting to prevent the rubber material from protruding.

[0009] However, when the elastic body is vulcanized and bonded to the inner cylinder, the adhesive is applied around the inner cylinder to enhance the adhesion. In particular, a liquid as shown in FIG. 6 is used. In the vibration damping device, ethylene glycol as a filled liquid may adhere to the adhesive. Then, when ethylene glycol adheres to the adhesive, there is a possibility that the adhesive layer is broken and peeling occurs between the elastic body and the inner cylinder. For this reason, since the adhesive interface cannot be exposed to the ethylene glycol side, it has been difficult to provide a supporting portion on the lower end surface side of the inner cylinder.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a vibration damping device that prevents the rubber material from protruding without causing separation between the elastic member and the inner member.

[0011]

According to a first aspect of the present invention, there is provided an anti-vibration apparatus comprising: an outer member connected to one of a vibration generating portion and a vibration receiving portion and formed in a cylindrical shape; and the other of the vibration generating portion and the vibration receiving portion. And an inner member which is located on the inner peripheral side of the outer member and has a recess at one end, and which is disposed and adhered between the inner member and the outer member to elastically deform the inner member and the outer member. An elastic body that is connected as possible and covers a portion along the inner peripheral wall of the concave portion of the inner member, and a liquid chamber that is arranged to face one end side of the inner member via the elastic body and is filled with liquid. It is characterized by having.

A vibration isolator according to a second aspect of the present invention is the vibration isolator according to the first aspect, wherein a strain concentration portion serving as a depression is provided in a portion of the elastic body facing the liquid chamber around the inner member. .

The operation of the vibration isolator according to the first aspect will be described below. An outer member formed in a tubular shape is connected to one of the vibration generating unit and the vibration receiving unit, and an inner member connected to the other of the vibration generating unit and the vibration receiving unit is located on the inner peripheral side of the outer member. Further, an elastic body disposed between the inner member and the outer member is bonded to connect the inner member and the outer member so as to be elastically deformable.

A recess is provided at one end of the inner member, and a portion along the inner peripheral wall of the recess is covered with an elastic body. The liquid chamber is disposed opposite the one end of the inner member via the elastic body. The liquid is filled.

Therefore, when the vibration is transmitted from the vibration generating portion connected to the outer member or the inner member, the elastic body is deformed, and the vibration is attenuated by the deformation of the elastic body. Vibration is less likely to be transmitted to the connected vibration receiver. Further, with the deformation of the elastic body, a damping action is generated based on a change in the pressure of the liquid in the liquid chamber, a viscous resistance of the liquid flow, and the like, whereby the vibration isolation effect can be improved.

Further, since the elastic body covers a portion along the inner peripheral wall of the concave portion provided at one end of the inner member, only the bottom surface of the concave portion is exposed to the liquid chamber, and the elastic material is vulcanized and adhered. Sometimes it becomes possible to provide a support for holding the inner member with a vulcanizing mold. For this reason, at the time of vulcanization bonding of the elastic body, both end sides of the inner member can be reliably pressed by the vulcanizing mold, and the rubber material can be prevented from protruding from the elastic body.

Further, since the elastic body covers the portion along the inner peripheral wall of the concave portion, even when the bottom surface, which is the deepest side of the concave portion, is exposed to the liquid chamber, the vibration is not applied to the vibration isolator. It is difficult for the tensile strain applied to the elastic body to be transmitted to the portion of the elastic body that covers the portion along the inner peripheral wall of the concave portion, so that peeling between the elastic body and the inner member does not easily progress.

That is, the input of vibration to the vibration isolator is mainly in the direction perpendicular to the surface on one end side of the inner member, and local distortion of the elastic body is also caused by this, and the bottom surface of the concave portion is used as the bonding interface. As a result, the strain at the bonding interface can be reduced.

As a result, even if the peeling occurs at the bonding interface, in the present invention, the peeling force does not progress because the force for tearing the elastic body and the inner member is reduced.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same function as the first embodiment. However, in the present invention, the elastic member facing the liquid chamber around the inner member is provided with a strain concentration portion serving as a depression. Therefore, the tensile strain applied to the elastic body is concentrated around the strain concentration portion provided in the elastic body portion facing the liquid chamber around the inner member, thereby suppressing the promotion of peeling from the bottom surface of the concave portion. Can be.

That is, the bottom surface of the concave portion is used as an adhesive interface, and the strain is gathered around the strain concentration portion provided on the elastic body, so that the strain at the adhesive interface can be further reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 5, and this embodiment will be described with reference to these drawings.

As shown in FIG. 1 showing the present embodiment, a bracket 12 having a cylindrical portion 12A formed in a cylindrical shape and having a flange portion 12B extending to the outer periphery provided on the upper portion of the cylindrical portion 12A prevents this. The outer frame of the vibration device 10 is configured.

As shown in FIG. 3, the flange portion 12B
Is provided with a pair of legs 14 which are bent downward once and then extend so as to project to the outer peripheral side in the horizontal direction, respectively, and further, a bracket is provided along a direction intersecting with the pair of legs 14. A stay 12C for supporting the vibration isolator 10 extends so as to protrude therefrom.
An outer cylindrical member 16 which is an outer member having a disk-shaped flange portion 16A formed at an upper end portion is press-fitted into the bracket 12, and is disposed in the bracket 12.

An outer peripheral surface of a rubber elastic body 18 which is formed in a cylindrical shape and has an embedded inter-ring 20 is vulcanized and bonded to the inner peripheral surface of the outer cylindrical member 16. 16 surrounds and holds the elastic body 18. The elastic body 18 corresponding to the lower part of the outer tube fitting 16
Is a thin portion 18A which is made thin, and an elastic body 18 is provided above the flange portion 12B of the bracket 12.
And a stopper rubber 19 is vulcanized and bonded.

Further, the elastic body 1 on the inner peripheral side of the outer cylindrical fitting 16 is provided.
At the center of the inner tube 8, an inner cylindrical member 24, which is an inner member made of metal and formed in a conical shape, is embedded while being vulcanized and bonded, and the upper end of the inner cylindrical member 24 is separated from the elastic body 18. It is protruding. The inner cylindrical fitting 24 is provided with a screw hole 24A in which a female screw is formed, and a detent pin 24B.

As shown in FIG. 1, a concave portion 25 which is a cylindrical recess is provided on a lower end surface forming one end side of the inner cylindrical member 24, and extends along the inner peripheral wall of the concave portion 25 of the inner cylindrical member 24. The elastic body 18 is thinly covered by the bent portion. In addition, a strain concentration portion 18 </ b> B serving as a recess is provided in an annular shape in a portion of the elastic body 18 around the inner cylinder fitting 24.

As described above, the elastic body 18 that is vulcanized and bonded to elastically deform and connect the inner cylindrical fitting 24 and the outer cylindrical fitting 16 to each other.
Are arranged and attached between the inner cylinder fitting 24 and the outer cylinder fitting 16, and the outer cylinder fitting 1 is attached to the bracket 12.
6, the outer tube fitting 16, the inner tube fitting 24, and the elastic body 18 are housed in the bracket 12.

As shown in FIG. 1 and FIG.
An arm bracket 26 is disposed at a position facing an upper end surface which is a top surface of the arm bracket via a stopper rubber 22 made of rubber and capable of being elastically deformed.

That is, into the cylindrical stopper rubber 22, a prismatic portion 26A constituting one end of an arm bracket 26 formed of an iron casting or the like is press-fitted.
2 is configured to cover one end of the arm bracket 26.

Further, the prism portion 26 is provided in the stopper rubber 22.
A is press-fitted, and a hole 22A formed in the upper wall of the stopper rubber 22 and a through-hole 27 formed in the prism 26A are formed.
A and an opening 22 formed in the lower wall of the stopper rubber 22
B, a stopper bolt 28 is inserted from above, and the stopper bolt 28 is screwed into a screw hole 24A of the inner cylinder fitting 24, so that the arm bracket 26 is fixed to the inner cylinder fitting 24.

At the other end of the arm bracket 26, a bolt 29 for connecting the arm bracket 26 to an engine (not shown) serving as a vibration generator is fixed. Therefore, the inner cylindrical fitting 24 protruding from the elastic body 18 is used for connection to the engine, and the inner cylindrical fitting 24 is connected to the engine serving as the vibration generating unit via the arm bracket 26. .

Accordingly, the stopper rubber 19 located below the arm bracket 26 and the flange portion 12B to which the stopper rubber 19 has been vulcanized are moved relative to the lower side of the arm bracket 26. It becomes a bound stopper that restricts it within a certain range.

On the other hand, a rebound stopper metal fitting 60 for restricting the relative movement of the inner cylindrical metal fitting 24 to the upper side of the inner cylindrical fitting 24 relative to the bracket 12 to a certain range by contacting the arm bracket 26 is provided on the upper portion of the inner cylindrical metal fitting 24. 26
And is disposed so as to face the inner tube fitting 24 via the. In FIG. 3, in a state where the rebound stopper fitting 60 formed in an inverted U shape sandwiches the pair of legs 14, the bent both ends of the rebound stopper fitting 60 are connected to the pair of legs 14. Abut.

Through holes 14A and 60A are formed in both ends of the rebound stopper fitting 60 and the leg 14, respectively. The through holes 14A and the rebound of the leg 14 are formed by a pair of set screws 64 shown in FIG. The through-hole 60A of the stopper 60 is integrally penetrated, and the through-hole 12D is also formed in the stay portion 12C. The through-hole 12D of the stay portion 12C is penetrated by a set screw (not shown) to serve as a vibration receiving portion. The vibration isolator 10 is fixed to the vehicle body 62 by being fastened to the vehicle body 62, respectively.

That is, the bracket 12 is attached to the bracket 1
2 and a pair of leg portions 14 and stay portions 1 formed on the outer peripheral side of
It will be connected to the vehicle body 62 via 2C.

On the other hand, a rubber diaphragm 30 is provided on the inner peripheral surface.
The ring material 31 to which is adhered by vulcanization is fitted and fixed inside the lower part of the outer tube fitting 16. This diaphragm 30
A liquid chamber 32 in which an inner wall surface is formed by these members is provided between the elastic body 18 and the elastic body 18, and a liquid such as ethylene glycol, water, or oil is sealed therein. In the liquid chamber 32, a partition member 34 made of, for example, a synthetic resin material is fitted and arranged on the inner wall surface of the thin portion 18A of the elastic body 18, so that the liquid chamber 32 is The liquid is divided into a main liquid chamber 32A and a sub liquid chamber 32B which are liquid chambers.

As described above, the main liquid chamber 32A in which the liquid is filled is disposed facing the lower end surface of the inner cylindrical member 24 via the elastic body 18, and the main liquid chamber 32A is surrounded by the main liquid chamber 32A around the inner cylindrical member 24. Thus, the strain concentration portion 18B is provided at the portion of the elastic body 18 which is formed.

Further, at the center of the partition member 34,
A circular opening 38 is formed, and a groove 36 formed in a groove shape is formed substantially along the outer peripheral end 34B inside the outer peripheral end 34B which is the outer peripheral surface of the partition member 34. Have been. At one end of the groove 36, a small hole 52 communicating the main liquid chamber 32A and the inside of the groove 36 is formed, and at the other end, a small hole 54 communicating the sub liquid chamber 32B and the inside of the groove 36 is formed. Is formed. Therefore, the elastic body 1
8, the groove 36 and the small hole 52 closed by the inner wall surface,
54 constitutes the orifice 42 communicating between the main liquid chamber 32A and the sub liquid chamber 32B. Further, an air chamber 44 is provided between the diaphragm 30 and the bottom wall of the bracket 12.

On the other hand, a rib 34A projecting upward from the opening 38 is formed in the partition member 34, and a membrane 46, which is an elastic plate having a central portion projecting in a circular shape, is engaged with the rib 34A. ing.

In the lower part of the membrane 46 near the outer periphery, the outer peripheral end is formed by the diaphragm 30 and the partition member 34.
And a circular metal plate 48 protruding in a circular shape so that the central portion is fitted into the opening portion 38, and the membrane 46 is sandwiched between the ribs 34A. ing. In addition, a hole is provided at the position of the disk 48 corresponding to the small hole 54 as shown in the figure.

Next, a procedure for manufacturing the vibration isolator 10 according to the present embodiment will be described. First, by pressing, the cylindrical portion 12A, the flange portion 12B, the leg portion 14, and the stay portion 12 are formed.
While forming the bracket 12 integrally having C,
Inner tube fitting 2 forming outer tube fitting 16 and applying adhesive
The elastic body 18 is vulcanized by placing the outer tube 4 and the outer tube fitting 16 in a vulcanizing mold 72 as a mold.

At this time, as shown in FIG. 5, the upper end surface of the inner cylinder fitting 24 is supported by the upper mold 72A of the vulcanization mold 72, and the upper end surface of the inner cylinder fitting 24 is similarly supported by the lower mold 72B of the vulcanization mold 72. The central portion of the bottom surface 25A of the concave portion 25 provided in the inner cylinder 24 is supported, so that the inner cylindrical fitting 24 is reliably supported.

Then, in the liquid, the membrane 4
6. Insert the partition member 34 and the diaphragm 30 with the disk 48 attached into the outer tube fitting 16, and
6, the outer peripheral side of the partition member 34 is engaged with the projection on the inner peripheral side to position the partition member 34 in the axial direction.
6 is drawn and the lower end of the outer sleeve 16 is caulked to form a tapered shape.

As a result, these members are connected to the outer tube fitting 16.
In addition to being housed inside, the thin wall portion 18A of the elastic body 18 and the partition member 34 are fitted while closely contacting each other, and the space between the pair of liquid chambers 32A and 32B is sealed by the partition member 34. , The state shown in FIG.

Further, the prism 26A of the arm bracket 26 is press-fitted into the stopper rubber 22 shown in FIG. 4, and a stopper bolt 28 is inserted through the stopper rubber 22 and the arm bracket 26. 24
To fix the arm bracket 26 to the inner tube fitting 24.

Next, while the outer cylinder 16 is pressed into the bracket 12, the inner cylinder 24, the outer cylinder 16, and the elastic body 18 are pressed.
Is stored in the bracket 12, and a pair of legs 14 formed so as to protrude from the bracket 12 is sandwiched between the rebound stopper fittings 60, and the rebound stopper fitting 60 is temporarily fixed to the pair of legs 14, thereby obtaining FIGS. The assembly is completed as shown in FIG.

Thereafter, the vibration isolator 1 thus completed is
0 is installed in the vehicle, a pair of setscrews 64 are passed through the pair of legs 14 and both ends of the rebound stopper fitting 60 and fastened to the vehicle body 62, and a set screw (not shown) is passed through the stay portion 12 </ b> C and the vehicle body 62. As shown in FIG. 3, the pair of leg portions 14 and stay portions 12
The bracket 12 connected to C and the rebound stopper fitting 60 are fixed to the vehicle body 62, and the vibration isolator 10 can be mounted on the vehicle body 62. Then, the arm bracket 26
Bolt 29 on the engine to attach the arm bracket 2
6 are connected.

Next, the operation of the present embodiment will be described. The outer tube fitting 16 formed in a tubular shape is used for the leg 1 of the bracket 12.
4 and the vehicle body 62 via the stay 12C.
An inner cylinder 24 is located on the inner peripheral side of the outer cylinder 16, one end of an arm bracket 26 is fixed to an end of the inner cylinder 24, and
Is connected to the engine at the other end. Further, an elastic body 18 disposed between the inner cylindrical fitting 24 and the outer cylindrical fitting 16 is provided.
However, the inner cylindrical fitting 24 and the outer cylindrical fitting 16 are connected so as to be elastically deformable.

Accordingly, when the engine mounted on the inner cylinder 24 via the arm bracket 26 operates, the vibration of the engine is transmitted to the elastic body 18 via the arm bracket 26 and the inner cylinder 24.

The elastic body 18 acts as a vibration absorbing body, and can absorb vibration by a vibration damping function based on internal friction of the elastic body 18. Further, the main liquid chamber 32A and the sub liquid chamber 3
The liquid in 2B circulates through orifice 42 to each other,
The damping effect based on the pressure change of the liquid generated in the orifice space, the viscous resistance of the liquid flow, and the like can improve the vibration isolation effect.

A concave portion 25 is provided on the lower end surface at one end of the inner cylindrical fitting 24, and a portion along the inner peripheral wall of the concave portion 25 is covered with the elastic body 18.
The liquid is filled in the main liquid chamber 32 </ b> A which is disposed to face through the main liquid chamber 8.

For this reason, it is possible to expose only the central portion of the bottom surface 25A of the concave portion 25 to serve as a support portion for pressing the inner cylindrical member 24 with the vulcanizing mold 72 when the elastic body 18 is vulcanized and bonded. At the time of vulcanization bonding of the elastic body 18, both ends of the inner cylindrical fitting 24 are surely pressed by the vulcanizing dies 72, respectively.
8 can be prevented from protruding.

Further, since the elastic body 18 covers the portion along the inner peripheral wall of the concave portion 25, even if the bottom surface 25A, which is the deepest side of the concave portion 25, is exposed to the main liquid chamber 32A, the vibration isolator 10 It is difficult for the tensile strain applied to the elastic body 18 to be transmitted to the portion of the elastic body 18 covering the portion along the inner peripheral wall of the concave portion 25 when the vibration is input to the It becomes difficult for the peeling to progress.

That is, the input of vibration to the vibration isolator 10 is mainly in the direction (Y direction in FIG. 1) orthogonal to the surface of the lower end surface of the inner cylindrical fitting 24, and the local distortion of the elastic body 18 is also caused by this. By using the bottom surface 25A of the concave portion 25 which is the end of the inner peripheral wall of the concave portion 25 extending in the direction orthogonal to the X direction as the adhesive interface, the distortion of the adhesive interface can be reduced. Can be.

As a result, even if peeling occurs at the bonding interface, in the present embodiment, the peeling force does not progress because the force for tearing the elastic body 18 and the inner tube fitting 24 becomes small.

On the other hand, in the present embodiment, a strain concentration portion 18B serving as a depression is provided in a portion of the elastic body 18 facing the main liquid chamber 32A around the inner cylinder fitting 24. For this reason, the tensile strain applied to the elastic body 18 is concentrated around the strain concentration portion 18B provided in the portion of the elastic body 18 facing the main liquid chamber 32A around the inner cylindrical fitting 24, and the bottom surface of the concave portion 25 25
Acceleration of peeling from A can be suppressed.

That is, the bottom surface 25A of the concave portion 25 is used as an adhesive interface, and the strain is gathered around the strain concentration portion 18B provided on the elastic body 18, so that the distortion of the adhesive interface can be further reduced.

Further, even when the orifice 42 capable of reducing a narrow frequency range is clogged and vibration is not sufficiently reduced by the orifice 42 alone, for example, when high-frequency vibration is transmitted, the membrane 46 can be used. Is not elastically deformed and the internal pressure in the liquid chamber 32 does not increase. As a result, even if high-frequency vibration that cannot be reduced by the orifice 42 is generated, the orifice 42 becomes a low dynamic spring, the vibration isolating characteristics are maintained without being reduced, and the effect of the vibration isolating device 10 is sufficiently exhibited.

On the other hand, when vibration of excessive amplitude is input from the engine, the flange 1 of the bracket 12
When the arm bracket 26 abuts on the stopper rubber 19 bonded to the 2B, the relative movement of the inner cylindrical fitting 24 to the bracket 12 below the bracket 12 can be restricted.
In addition, since the arm bracket 26 abuts on the rebound stopper metal fitting 60 which is installed on the bracket 12 and is located opposite to one end of the arm bracket 26, the relative movement of the inner cylindrical metal fitting 24 to the bracket 12 in the upward direction is restricted. can do.

In the above embodiment, the arm bracket 26 and the inner cylinder 2
4 side, and a bracket 1 is attached to the vehicle body 62 which is a vibration receiving portion.
2 and the outer tube 16 are connected.
The reverse configuration may be adopted.

On the other hand, in the embodiment, the purpose is to dampen an engine mounted on a vehicle. However, the anti-vibration device of the present invention is used for, for example, a body mount of a vehicle or other uses other than the vehicle. Needless to say,
The shape and size of the elastic body and the number of orifices are not limited to those of the embodiment.

[0063]

As described above, the vibration isolator according to the present invention is excellent in that it is possible to prevent the rubber material from protruding without progressing the separation between the elastic body and the inner member. Has an effect.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a vibration isolator according to the present invention.

FIG. 2 is a side view showing an embodiment of a vibration isolator according to the present invention.

FIG. 3 is another side view showing an embodiment of the vibration isolator according to the present invention.

FIG. 4 is a cross-sectional view for explaining assembly of an embodiment of the vibration isolator according to the present invention.

FIG. 5 is a cross-sectional view showing the support of an inner cylindrical member applied in a vulcanizing mold applied to an embodiment of the vibration isolator according to the present invention.

FIG. 6 is a cross-sectional view showing a vibration isolator according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 16 Outer cylinder 18 Elastic body 24 Inner cylinder 25 Recess 32A Main liquid chamber

Claims (2)

[Claims] An outer member connected to one of the vibration generating portion and the vibration receiving portion and formed in a cylindrical shape; and an outer member connected to the other of the vibration generating portion and the vibration receiving portion and located on an inner peripheral side of the outer member. An inner member provided with a concave portion on one end side; and an inner peripheral wall disposed between the inner member and the outer member and bonded so as to elastically deform the inner member and the outer member. A vibration isolator, comprising: an elastic body that covers a portion along the line, and a liquid chamber that is arranged to face one end of the inner member via the elastic body and is filled with a liquid. 2. An anti-vibration device according to claim 1, wherein a strain concentration portion serving as a depression is provided in a portion of the elastic body facing the liquid chamber around the inner member.