JP3805080B2 - Vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration isolator that is applied to prevent transmission of vibration from a vibration generating unit, and is applicable to mounts that support members such as an engine that generate vibration.
[0002]
[Prior art]
For example, an anti-vibration device as an engine mount is disposed between an engine that is a vibration generation unit of a vehicle and a vehicle body that is a vibration receiving unit, and the anti-vibration device absorbs vibration generated by the engine. It is structured to prevent transmission to the side.
[0003]
As one example, a vibration isolator 110 as shown in FIG. 6 is known and will be described below.
[0004]
As shown in these drawings, a rubber elastic body 118 is vulcanized and bonded to these metal fittings between the outer cylinder fitting 120 of the vibration isolator 110 and the inner cylinder fitting 116 as an inner member. In addition, a liquid chamber 114 filled with a liquid with the elastic body 118 as a part of the wall surface is provided in the outer cylinder fitting 120.
[0005]
When the elastic body 118 is vulcanized and bonded to the inner cylinder fitting 116, the upper end surface of the inner cylinder fitting 116 is brought into contact with a vulcanization mold (not shown) for vulcanization molding of a rubber material. The inner cylinder fitting 116 is disposed on the lower end surface side of the inner cylinder fitting 116 and vulcanized and bonded. At this time, the inner cylinder fitting 116 is attached to the vulcanization mold by the injection pressure of the rubber material. The upper end surface is pressed to prevent the rubber material from protruding from the elastic body 118 to the upper end surface of the inner cylinder fitting 116.
[0006]
[Problems to be solved by the invention]
However, in the structure of the conventional vibration isolator 110 as described above, the protrusion of the rubber material to the upper end surface side of the inner cylinder fitting 116 is sufficiently prevented depending on the dimensional accuracy of the inner cylinder fitting 116 and the flow of the rubber material. I could not do it.
[0007]
That is, in the current manufacturing process of the vibration isolator, since only the upper end surface, which is one side of the inner cylinder fitting 116, is pressed by the vulcanization mold when the elastic body 118 is vulcanized and bonded, the rubber is applied to the upper end face of the inner cylinder fitting 116. There was a risk of the material protruding.
[0008]
On the other hand, it is conceivable to provide a support portion for pressing with a vulcanizing mold at the upper and lower portions of the inner cylinder fitting to prevent the rubber material from protruding.
[0009]
However, when an elastic body is vulcanized and bonded to the inner cylinder fitting, an adhesive is applied around the inner cylinder fitting to improve the adhesion. In particular, a vibration isolator using a liquid as shown in FIG. Then, ethylene glycol as a filled liquid may adhere to the adhesive. And when ethylene glycol adheres to an adhesive agent, there exists a possibility that a contact bonding layer may be destroyed and peeling may generate | occur | produce between an elastic body and an inner cylinder metal fitting. For this reason, since the adhesion interface cannot be exposed to the ethylene glycol side, it is difficult to provide a support portion on the lower end surface side of the inner cylinder fitting.
[0010]
The present invention has been made in consideration of the above-described facts, and an object thereof is to provide a vibration isolator that prevents the rubber material from protruding without causing separation between the elastic body and the inner member.
[0011]
[Means for Solving the Problems]
An anti-vibration device according to claim 1 is connected to one of the vibration generating unit and the vibration receiving unit and is formed in a cylindrical shape,
An inner member connected to the other of the vibration generating portion and the vibration receiving portion and located on the inner peripheral side of the outer member and provided with a recess on one end side;
And elastic body you connect the inner and outer members to be elastically deformable disposed is and vulcanized adhesion between these inner and outer members,
A liquid chamber disposed opposite to the one end side of the inner member via the elastic body and filled with a liquid ,
The elastic body is integrally formed with a cylindrical portion that covers a portion along the inner peripheral wall of the recess of the inner member as a part of the elastic body, and the outer peripheral surface and the front end surface of the cylindrical portion are While being vulcanized and bonded to the inner peripheral wall and the bottom surface of the concave portion, an opening for exposing the bottom surface portion of the concave portion is formed on the inner peripheral side of the distal end surface in the cylindrical portion.
[0012]
The vibration isolator according to claim 2 is characterized in that, in the vibration isolator according to claim 1, a strain concentrating portion which becomes a depression is provided in a portion of the elastic body facing the liquid chamber around the inner member.
[0013]
The operation of the vibration isolator according to claim 1 will be described below.
An outer member formed in a cylindrical shape is connected to one of the vibration generating portion and the vibration receiving portion, and an inner member connected to the other of the vibration generating portion and the vibration receiving portion is located on the inner peripheral side of the outer member. Furthermore, the elastic body arrange | positioned between these inner members and outer members is adhere | attached, and an inner member and an outer member are connected so that elastic deformation is possible.
[0014]
Also, a recess is provided on one end side of the inner member, and an elastic body covers a portion along the inner peripheral wall of the recess, and a liquid is filled in a liquid chamber disposed facing the one end side of the inner member via the elastic body. Is done.
[0015]
Therefore, when vibration is transmitted from the vibration generating unit 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 member, and is connected to the inner member or the outer member. It becomes difficult for vibration to be transmitted to the vibration receiving portion side. Further, along with the deformation of the elastic body, a damping action based on a change in the pressure of the liquid in the liquid chamber, a viscous resistance of the liquid flow, etc. occurs, and this can also improve the vibration isolation effect.
[0016]
In addition, a cylindrical portion that covers a portion along the inner peripheral wall of the concave portion of the inner member is integrally formed on the elastic body, and the outer peripheral surface and the front end surface of the cylindrical portion are formed on the inner peripheral wall and the bottom surface of the concave portion. Each is vulcanized and bonded, and an opening that exposes the bottom surface of the recess is formed on the inner peripheral side of the tip surface of the cylindrical portion. It becomes possible to provide a support portion for holding the inner member with a vulcanization mold when the body is vulcanized and bonded. Therefore, it is possible to prevent the rubber material from protruding from the elastic body by securely pressing both ends of the inner member with the vulcanization mold at the time of vulcanization bonding of the elastic body.
[0017]
Furthermore, since the cylindrical part of the elastic body covers the portion along the inner peripheral wall of the recess, even if the bottom surface that is the innermost side of the recess is exposed to the liquid chamber, vibration input to the vibration isolator At this time, the tensile strain applied to the elastic body is not easily transmitted to the cylindrical portion of the elastic body covering the portion along the inner peripheral wall of the recess, and the separation between the elastic body and the inner member is difficult to proceed. Become.
[0018]
That is, the vibration input to the vibration isolator is mainly in the direction perpendicular to the surface on the one end side of the inner member, and local distortion of the elastic body is also caused thereby, and the tip surface of the cylindrical portion of the elastic body by the bottom surface of the recess and the end portion of the bonding interface, it is possible to reduce the distortion of the end of the bonding interface.
[0019]
As a result, even if the peeling occurs at the end portion of the adhesion interface, in this claim, the force for tearing the elastic body and the inner member becomes small, so that the peeling does not proceed from the end portion of the adhesion interface .
[0020]
The operation of the vibration isolator according to claim 2 will be described below.
This claim also has the same effect as that of claim 1. However, in this claim, a strain concentration portion that becomes a depression is provided in the elastic body portion facing the liquid chamber around the inner member. For this reason, the tensile strain applied to the elastic body is concentrated around the strain concentration portion provided in the portion of the elastic body facing the liquid chamber around the inner member, and the tip surface of the cylindrical portion of the elastic body is The promotion of peeling from the bottom surface of the recess can be suppressed.
[0021]
That is, the strain at the adhesive interface can be further reduced by using the bottom surface of the recess as the adhesive interface and collecting the strain around the strain concentration portion provided in the elastic body.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
One embodiment of the vibration isolator according to the present invention is shown in FIGS. 1 to 5, and this embodiment will be described based on these drawings.
[0023]
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 on the outer periphery on the upper portion of the cylindrical portion 12A is provided with the vibration isolator 10. This constitutes the outer frame.
[0024]
As shown in FIG. 3, the flange portion 12B is provided with a pair of leg portions 14 which are once bent downward and extend so as to protrude outward in the horizontal direction. A stay portion 12C for supporting the vibration isolator 10 extends so as to protrude from the bracket 12 in a direction intersecting with the leg portion 14. Then, an outer cylinder fitting 16 that is an outer member having a disc-shaped flange portion 16 </ b> A formed at the upper end portion is press-fitted into the bracket 12 and disposed in the bracket 12.
[0025]
Further, the outer peripheral surface of a rubber elastic body 18 which is formed in a cylindrical shape and has an interring 20 embedded therein is vulcanized and bonded to the inner peripheral surface of the outer cylindrical member 16. The body 18 is surrounded and held. The portion of the elastic body 18 corresponding to the lower part of the outer tube fitting 16 is a thin wall portion 18A, and a stopper rubber 19 connected to the elastic body 18 is added to the upper portion of the flange portion 12B of the bracket 12. Sulfur bonded.
[0026]
Furthermore, an inner cylinder fitting 24, which is an inner member made of metal and formed in a conical shape, is embedded in the central portion of the elastic body 18 on the inner peripheral side of the outer cylinder fitting 16 while being vulcanized and bonded, The upper end portion of the inner cylinder fitting 24 protrudes from the elastic body 18. The inner cylinder 24 is provided with a screw hole 24A in which an internal thread is formed and a rotation-preventing pin 24B.
[0027]
As shown in FIG. 1, a concave portion 25 that is a cylindrical recess is provided on a lower end surface that forms one end side of the inner cylindrical fitting 24, and a portion along the inner peripheral wall of the concave portion 25 of the inner cylindrical fitting 24 is provided. A cylindrical portion formed at the center of the lower end of the elastic body 18 is thinly covered. Further, a strain concentrating portion 18 </ b> B that is a depression is provided in an annular shape in the portion of the elastic body 18 around the inner cylindrical fitting 24.
[0028]
As described above, the elastic body 18 which is vulcanized and bonded so as to elastically deform the inner cylinder fitting 24 and the outer cylinder fitting 16 is disposed and attached between the inner cylinder fitting 24 and the outer cylinder fitting 16. The outer cylinder fitting 16 is press-fitted into the bracket 12, and the outer cylinder fitting 16, the inner cylinder fitting 24 and the elastic body 18 are accommodated in the bracket 12.
[0029]
As shown in FIGS. 1 and 2, an arm bracket 26 is disposed at a position opposite to the upper end surface, which is the top surface of the inner cylinder fitting 24, via a rubber rubber elastically deformable stopper rubber 22. Yes.
[0030]
That is, a rectangular column portion 26A constituting one end side of an arm bracket 26 formed of iron casting or the like is press-fitted into the cylindrical stopper rubber 22, and the stopper rubber 22 is put on one end side of the arm bracket 26. It has a structure.
[0031]
Further, in a state in which the rectangular column portion 26A is press-fitted into the stopper rubber 22, a hole 22A formed in the upper wall of the stopper rubber 22, a through hole 27A formed in the rectangular column portion 26A, and a lower wall of the stopper rubber 22 are formed. A set bolt 28 is inserted from above into each of the openings 22 </ b> B, and the set bolt 28 is screwed into a screw hole 24 </ b> A of the inner cylinder fitting 24, so that the arm bracket 26 is fixed to the inner cylinder fitting 24.
[0032]
Further, a bolt 29 for connecting the arm bracket 26 to an engine (not shown) serving as a vibration generating unit is fixed to the other end side of the arm bracket 26. Therefore, the inner cylinder fitting 24 protruding from the elastic body 18 is used for connection to the engine, and the inner cylinder fitting 24 is connected to the engine serving as a vibration generating portion via the arm bracket 26. .
[0033]
Accordingly, the stopper rubber 19 located at the lower portion of the arm bracket 26 and the flange portion 12B to which the stopper rubber 19 is vulcanized and bonded are allowed to move relative to the lower side of the arm bracket 26 within a certain range. It becomes a bound stopper that restricts inward.
[0034]
On the other hand, on the upper part of the inner cylinder fitting 24, a rebound stopper fitting 60 that abuts the arm bracket 26 and restricts the relative movement of the inner cylinder fitting 24 to the upper side with respect to the bracket 12 within a certain range via the arm bracket 26. The inner cylinder fitting 24 is disposed opposite to the inner cylinder fitting 24. Then, in FIG. 3, in a state where the rebound stopper fitting 60 formed in an inverted U shape sandwiches the pair of leg portions 14, the bent both ends of the rebound stopper fitting 60 are connected to the pair of leg portions 14. It is in contact.
[0035]
Through holes 14A and 60A are formed in both end portions and the leg portion 14 of the rebound stopper fitting 60, respectively, and the through hole 14A of the leg portion 14 and the rebound stopper fitting 60 are formed by a pair of set screws 64 shown in FIG. The through hole 60A 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), so that the vehicle body 62 serving as a vibration receiving portion is formed. The vibration isolator 10 is fixed to the vehicle body 62 by being fastened respectively.
[0036]
That is, the bracket 12 is connected to the vehicle body 62 via the pair of leg portions 14 and the stay portion 12 </ b> C formed on the outer peripheral side of the bracket 12.
[0037]
On the other hand, a ring material 31 having a rubber diaphragm 30 vulcanized and bonded to the inner peripheral surface is fitted and fixed inside the lower portion of the outer tube fitting 16. A liquid chamber 32 having an inner wall surface formed by these members is provided between the diaphragm 30 and the elastic body 18, and a liquid such as ethylene glycol, water, or oil is enclosed therein. In the liquid chamber 32, a partition member 34 made of, for example, a synthetic resin material is fitted and disposed on the inner wall surface of the thin portion 18A of the elastic body 18, and the liquid chamber 32 is paired with a pair of small chambers. The liquid chamber is divided into a main liquid chamber 32A and a sub liquid chamber 32B.
[0038]
As described above, the main liquid chamber 32A filled with the liquid is disposed so as to face the lower end surface of the inner cylinder fitting 24 via the elastic body 18, and the elastic body facing the main liquid chamber 32A around the inner cylinder fitting 24 is disposed. The strain concentration portion 18B is provided at the portion 18.
[0039]
Further, a circular opening 38 is formed in the central portion of the partition member 34, and the inner side of the outer peripheral end portion 34B serving as the outer peripheral surface of the partition member 34 is substantially along the outer peripheral end portion 34B. A groove portion 36 formed in a groove shape is provided over the entire circumference. A small hole 52 that connects the main liquid chamber 32A and the inside of the groove 36 is formed at one end of the groove 36, and a small hole 54 that connects the sub liquid chamber 32B and the inside of the groove 36 is formed at the other end. Is formed. Accordingly, the groove 36 and the small holes 52 and 54 closed by the inner wall surface of the elastic body 18 constitute an orifice 42 that communicates between the main liquid chamber 32A and the sub liquid chamber 32B. Further, an air chamber 44 is formed between the diaphragm 30 and the bottom wall of the bracket 12.
[0040]
On the other hand, the partition member 34 is formed with a rib 34A that protrudes to the upper side of the opening 38, and a membrane 46 that is an elastic plate that protrudes in a circular shape at the center is engaged with the rib 34A.
[0041]
The outer peripheral end of the membrane 46 is clamped between the diaphragm 30 and the partition wall member 34 and is fixed in a circular shape so that the central portion is fitted into the opening 38. A metal disk 48 contacts and the membrane 46 is sandwiched between the ribs 34A. In addition, the position of the disk 48 corresponding to the small hole 54 has a hole as shown in the figure.
[0042]
Next, the manufacturing procedure of the vibration isolator 10 according to the present embodiment will be described.
First, the bracket 12 having the cylindrical portion 12A, the flange portion 12B, the leg portion 14 and the stay portion 12C is formed by pressing, and the outer cylindrical metal fitting 16 is formed, and the inner cylindrical metal fitting to which the adhesive is applied is formed. 24 and the outer cylinder fitting 16 are placed in a vulcanization mold 72, which is a mold, and the elastic body 18 is vulcanized.
[0043]
At this time, as shown in FIG. 5, the upper end surface of the inner cylinder fitting 24 is supported by the upper mold 72 </ b> A of the vulcanization mold 72, and the lower mold 72 </ b> B of the vulcanization mold 72 is provided on the upper end face of the inner cylinder fitting 24. By supporting the central portion of the bottom surface 25 </ b> A of the recessed portion 25, the inner cylinder fitting 24 is reliably supported.
[0044]
Then, in the liquid, the partition member 34 and the diaphragm 30 with the membrane 46 and the disc 48 attached thereto are inserted into the outer cylinder fitting 16, and the partition member 34 is inserted into the protruding portion on the inner peripheral side of the outer cylinder fitting 16. The lower end of the outer cylinder fitting 16 is drawn and the lower end portion of the outer cylinder fitting 16 is caulked to form a taper shape while engaging the outer peripheral side of the wall member and positioning the partition wall member 34 in the axial direction.
[0045]
As a result, these members are not only housed in the outer cylinder fitting 16, but the thin wall portion 18A of the elastic body 18 and the partition wall member 34 are fitted in close contact with each other to form a pair of liquid chambers. The space between 32A and 32B is sealed by the partition member 34, resulting in a state as shown in FIG.
[0046]
Further, the rectangular column portion 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 into the stopper rubber 22 and the arm bracket 26, and the stopper bolt 28 is screwed into the inner cylinder fitting 24. By stopping, the arm bracket 26 is fixed to the inner cylinder fitting 24.
[0047]
Next, while the outer cylinder fitting 16 is press-fitted into the bracket 12, the inner cylinder fitting 24, the outer cylinder fitting 16, and the elastic body 18 are accommodated in the bracket 12, and a pair of legs 14 that protrude from the bracket 12 are formed. When the rebound stopper metal fitting 60 is sandwiched between the rebound stopper metal fittings 60 and temporarily fixed to the pair of legs 14, the assembly is completed as shown in FIGS.
[0048]
Thereafter, the vibration isolator 10 thus completed is installed in the vehicle, and a pair of set screws 64 are passed through both ends of the pair of leg portions 14 and the rebound stopper metal fitting 60 and fastened to the vehicle body 62. As shown in FIG. 3, the bracket 12 connected to the pair of leg portions 14 and the stay portion 12 </ b> C and the rebound stopper metal fitting 60 are fixed to the vehicle body 62 by penetrating a set screw that does not pass through the stay portion 12 </ b> C and fastening to the vehicle body 62. The vibration isolator 10 can be mounted on the vehicle body 62. Then, the bolts 29 of the arm bracket 26 are fastened to connect the arm bracket 26 to the engine.
[0049]
Next, the operation of this embodiment will be described.
An outer cylinder fitting 16 formed in a cylindrical shape is connected to the vehicle body 62 via the leg portion 14 of the bracket 12 and the stay portion 12C. Further, the inner cylinder fitting 24 is located on the inner peripheral side of the outer cylinder fitting 16, and one end side of the arm bracket 26 is fixed to the end portion of the inner cylinder fitting 24, and the other end side of the arm bracket 26 is connected to the engine. Connected. Further, an elastic body 18 disposed between the inner cylinder fitting 24 and the outer cylinder fitting 16 connects the inner cylinder fitting 24 and the outer cylinder fitting 16 so as to be elastically deformable.
[0050]
Therefore, when the engine mounted on the inner cylinder fitting 24 via the arm bracket 26 is operated, the vibration of the engine is transmitted to the elastic body 18 via the arm bracket 26 and the inner cylinder fitting 24.
[0051]
The elastic body 18 acts as a vibration absorbing main body and can absorb vibrations by a vibration damping function based on the internal friction of the elastic body 18. Furthermore, the liquid in the main liquid chamber 32A and the sub liquid chamber 32B circulates through the orifice 42, and the vibration isolation effect is improved by the damping action based on the pressure change of the liquid generated in the orifice space, the viscous resistance of the liquid flow, etc. can do.
[0052]
Further, a concave portion 25 provided on the lower end surface which is one end side of the inner sleeve 24, elastic portion along the inner peripheral wall of the recess 25 covers the cylindrical portion of the elastic member 18, at one end of the inner cylindrical member 24 A liquid is filled in the main liquid chamber 32 </ b> A that is disposed to face the body 18.
[0053]
For this reason, it is possible to expose only the central portion of the bottom surface 25A of the concave portion 25 and use it as a support portion for pressing the inner cylinder fitting 24 with the vulcanization mold 72 when the elastic body 18 is vulcanized and bonded. At the time of vulcanization bonding, both end sides of the inner cylindrical metal member 24 can be securely pressed by the vulcanization molds 72 to prevent the rubber material from protruding from the elastic body 18.
[0054]
Further, since the cylindrical portion of the elastic body 18 covers up to the portion along the inner peripheral wall of the recess 25, even if the bottom surface 25A, which is the innermost side of the recess 25, is exposed to the main liquid chamber 32A, vibration isolation is provided. The tensile strain applied to the elastic body 18 at the time of inputting vibration to the apparatus 10 is difficult to be transmitted to the cylindrical portion of the elastic body 18 covering the portion along the inner peripheral wall of the recess 25, and the elastic body 18 Peeling is less likely to proceed with the inner cylinder fitting 24.
[0055]
That is, the vibration input 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 metal member 24, and the local distortion of the elastic body 18 is thereby caused in the X direction in FIG. The bottom surface 25A of the recess 25, which is the end of the inner peripheral wall of the recess 25 extending in the direction orthogonal to the X direction, and the end surface of the cylindrical portion of the elastic body 18 are connected to the end of the adhesive interface. By doing so, the distortion at the end of the adhesion interface can be reduced.
[0056]
As a result, even if peeling occurs at the end of the adhesive interface, in the present embodiment, the force for tearing the elastic body 18 and the inner cylindrical fitting 24 is reduced, so that peeling does not proceed from the end of the adhesive interface. become.
[0057]
On the other hand, in the present embodiment, a strain concentration portion 18B that is a depression is provided in the portion of the elastic body 18 that faces the main liquid chamber 32A around the inner cylindrical 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 recess 25 The promotion of peeling from 25A can be suppressed.
[0058]
That is, the distortion of the adhesive interface can be further reduced by collecting the distortion around the strain concentration portion 18B provided in the elastic body 18 by using the bottom surface 25A of the recess 25 as the adhesive interface.
[0059]
Further, the membrane 46 is elastically deformed even when the orifice 42 capable of reducing only a narrow frequency range is clogged and vibration is not sufficiently reduced only by the orifice 42, such as when high-frequency vibration is transmitted. Thus, the internal pressure in the liquid chamber 32 does not increase. As a result, even if high-frequency vibration that cannot be reduced in the orifice 42 occurs, the spring 42 becomes a low dynamic spring, the vibration-proof characteristic is maintained without being reduced, and the effect of the vibration-proof device 10 is sufficiently exhibited.
[0060]
On the other hand, when vibration with an excessive amplitude is input from this engine, the arm bracket 26 comes into contact with the stopper rubber 19 bonded to the flange portion 12B of the bracket 12, so that the inner cylinder fitting 24 with respect to the bracket 12 is brought into contact. The relative movement to the lower side can be restricted. In addition, the arm bracket 26 abuts on a rebound stopper fitting 60 that is installed on the bracket 12 and is opposed to one end side of the arm bracket 26, thereby restricting the relative movement of the inner cylindrical fitting 24 relative to the bracket 12 to the upper side. can do.
[0061]
In the above-described embodiment, the arm bracket 26 and the inner cylinder fitting 24 side are connected to the engine that is the vibration generating portion, and the bracket 12 and the outer cylinder fitting 16 side are connected to the vehicle body 62 that is the vibration receiving portion. However, the reverse configuration may be used.
[0062]
On the other hand, in the embodiment, the purpose is to dampen the engine mounted on the vehicle, but the vibration proofing device of the present invention can be used for, for example, a vehicle body mount or other uses other than the vehicle. Needless to say, the shape, size, number of orifices, and the like of the elastic body are not limited to those of the embodiment.
[0063]
【The invention's effect】
As a result of the configuration described above, the vibration isolator of the present invention has an excellent effect that it is possible to prevent the rubber material from protruding without causing separation between the elastic body and the inner member.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing an 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 illustrating assembly of an embodiment of the vibration isolator according to the present invention.
FIG. 5 is a cross-sectional view showing the support in the vulcanization mold of the inner cylinder fitting applied to one embodiment of the vibration isolator according to the present invention.
FIG. 6 is a cross-sectional view showing a vibration isolator according to the prior art.
[Explanation of symbols]
10 Antivibration device 16 Outer cylinder fitting 18 Elastic body 24 Inner cylinder fitting 25 Recess 32A Main liquid chamber

Claims (2)

An outer member connected to one of the vibration generating portion and the vibration receiving portion and formed in a cylindrical shape;
An inner member connected to the other of the vibration generating portion and the vibration receiving portion and located on the inner peripheral side of the outer member and provided with a recess on one end side;
And elastic body you connect the inner and outer members to be elastically deformable disposed is and vulcanized adhesion between these inner and outer members,
A liquid chamber disposed opposite to the one end side of the inner member via the elastic body and filled with a liquid ,
The elastic body is integrally formed with a cylindrical portion that covers a portion along the inner peripheral wall of the recess of the inner member as a part of the elastic body, and the outer peripheral surface and the front end surface of the cylindrical portion are An anti-vibration device characterized in that an opening for exposing the bottom surface of the recess is formed on the inner peripheral side of the tip surface of the cylindrical portion while being vulcanized and bonded to the inner peripheral wall and the bottom surface of the recess.   The anti-vibration device according to claim 1, wherein a strain concentration portion that becomes a depression is provided in a portion of the elastic body facing the liquid chamber around the inner member.

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