JPH0524837Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention is a cushion rubber device that is interposed between a predetermined shaft member and a mounting member, and is designed to isolate vibrations mainly input in the axial direction of the shaft member. More specifically, it is a fluid-filled cushion rubber assembly that effectively isolates input vibration based on the flow of a predetermined incompressible fluid sealed inside through an orifice, The present invention relates to a fluid-filled cushion rubber assembly that has good properties, excellent sealing performance for sealed fluid, excellent durability, and exhibits an excellent vibration-proofing effect against input vibrations.

(Prior art and its problems) One type of anti-vibration support used in vehicle suspensions, such as automobiles, is a support that is interposed between a predetermined shaft member and a mounting member, such as a strut bending in an automobile suspension. There is a cushion rubber device designed to mainly dampen vibrations input in the axial direction of the shaft member. In recent years, in such cushion rubber devices, an inner cylindrical fitting into which the shaft member is inserted and attached, and an annular fitting disposed on the outside of the inner cylindrical fitting at a predetermined distance, which is attached to the mounting member, have been developed. A pair of plates, a rubber elastic body that elastically connects the inner cylindrical fitting and the mounting plate, and a pair of rubber elastic bodies that are formed to face each other in the axial direction and are filled with a predetermined incompressible fluid. and an orifice that allows the pair of fluid chambers to communicate with each other.Input vibration is effectively damped based on the fact that the incompressible fluid sealed in each fluid chamber flows mutually through the orifice. A so-called fluid-filled cushion rubber assembly has been proposed.

By the way, in such a fluid-filled cushion rubber assembly, an annular orifice forming member is arranged in a fixed position on the inner circumference of the mounting plate, and a fluid chamber is formed in the annular orifice forming member in the circumferential direction. However, in this type of fluid-filled cushion rubber assembly (hereinafter simply referred to as a fluid-filled cushion rubber assembly), due to its structure, conventionally, the cushion rubber assembly It is common for the number of three-dimensional component parts to increase,
The ease of assembly was not necessarily good. In addition, since there are a large number of component parts, there are inevitably many paths for the sealed fluid (incompressible fluid) to escape to the outside, and there is also the problem that the sealing performance against the sealed fluid is correspondingly inferior. Ta.

In addition, conventional fluid-filled cushion rubber assemblies are usually provided with a stopper mechanism to restrict excessive displacement in the axial direction between the inner cylinder fitting and the mounting plate. Since the stopper function was performed based on the fact that a predetermined stopper fitting came into contact with the rubber elastic body and directly prevented the elastic deformation of the rubber elastic body, the contact of the stopper fitting was There is a problem in that the rubber elastic body is damaged due to this, and as a result, the life of the rubber elastic body and eventually the cushion rubber assembly is shortened. In addition, since excessive deformation of the rubber elastic body was not reliably prevented, there was a problem in that an excessive load was applied to the orifice forming member through the rubber elastic body, and the orifice formed due to the excessive load. Another problem was that the forming member was easily deformed.

(Solution Means) Here, the present invention has been made against the background of the above, and its gist is (a) an inner cylindrical fitting into which the shaft member is inserted and attached; an annular first rubber elastic body integrally vulcanized and bonded to the outer peripheral surface of the axially intermediate portion of the inner cylinder fitting and extending radially outward; and an outer peripheral portion of the first rubber elastic body. The inner peripheral part is integrally vulcanized and bonded to the mounting member, and the outer peripheral part is integrally fixed to the inner peripheral part of an annular mounting plate that is attached to the mounting member. An annular orifice forming member integrally provided with an annular caulking portion that extends out, and a cylindrical orifice forming member that is cylindrical and at one end in the axial direction relative to the outer circumference of the orifice forming member and/or the inner circumference of the mounting plate. a second rubber elastic body forming an annular recess opening in the axial direction between the inner cylindrical fitting and the second rubber elastic body, which is integrally vulcanized and bonded in a state extending to the opposite side from the caulking portion; (b) a first integrally vulcanized adhesive member having an annular caulking fitting integrally vulcanized and adhered to the other end side in the axial direction of the second rubber elastic body; (b) an annular plate portion; a cylindrical part extending in one direction in the axial direction from the inner periphery of the plate part, the cylindrical part being press-fitted and fixed to the inner periphery of one end of the inner cylindrical fitting; (c) an annular first end fitting that is integrally assembled to the first integrally vulcanized adhesive member by crimping and fixing the crimping fitting to the outer peripheral edge of the member;
An annular first end fitting is formed by fluid-tightly closing the opening of an annular recess between the inner cylinder fitting and the second rubber elastic body with the first end fitting. a fluid chamber; (d) an annular second end fitting including a cylindrical part located on the inner circumference of the annular plate part and extending in one axial direction; and the second end fitting. in the extending direction of the cylindrical part, the small diameter end is located at the large diameter end, which is arranged so as to face the plate part of the second end fitting at a predetermined distance. A tapered metal fitting having a tapered cylindrical shape with an outward caulking portion, and a radially outwardly extending portion between the small diameter end of the tapered metal fitting and the plate portion of the second end fitting. and a third annular rubber elastic body which is integrally vulcanized and bonded to each other to form an annular space of a predetermined length that opens, and the inner tube is connected to the inner tube in the cylindrical portion of the second end fitting. While being press-fitted and fixed to the inner peripheral surface of the other end of the metal fitting, the caulking part of the orifice forming member is caulked and fixed to the caulked part of the tapered metal fitting, so that the first integrally vulcanized adhesive member a second integrally vulcanized adhesive member integrally assembled; and (e) a second integrally vulcanized adhesive member formed between them by assembly to the first integrally vulcanized adhesive member. an annular second fluid chamber; (f) a predetermined incompressible fluid sealed in the second fluid chamber and the first fluid chamber; and (g) the first and second fluid chambers. and a circumferential orifice formed in the orifice forming member in communication with each other, through which the incompressible fluid sealed in the first and second fluid chambers mutually flows. Based on this, the fluid-filled cushion rubber assembly is configured to dampen vibrations input in the axial direction of the shaft member.

(Operation/Effect) According to such a fluid-filled cushion rubber assembly, similar to the above-mentioned type, the rubber elastic body (the first to third rubber elastic bodies) between the inner cylinder fitting and the mounting plate is A pair of fluid chambers (first and second fluid chambers) facing each other in the axial direction are mutually connected to each other through a circumferential orifice of an annular orifice forming member fixedly arranged with respect to the mounting plate. The incompressible fluid sealed in each fluid chamber mutually flows through the orifice, so that vibrations input in the axial direction of the shaft member are effectively damped. It is.

In the present invention, in this type of fluid-filled cushion rubber assembly, as described above, the annular orifice forming member fixed to the inner peripheral part of the mounting plate and the inner cylindrical fitting are connected to the first and second parts. is integrally vulcanized and bonded to the rubber elastic body to form an integral member (first integrally vulcanized adhesive member), and a first end fitting and a second integrally vulcanized member are integrally vulcanized and bonded to the first integrally vulcanized adhesive member. Because the desired fluid-filled cushion rubber assembly can be obtained simply by assembling the adhesive members in one piece, its assemblability is extremely excellent, and the number of parts to be assembled can be reduced. Since only a small amount is required, the sealing performance against the enclosed fluid (incompressible fluid) can be greatly improved compared to the conventional method.

Further, according to the present invention, in the second integrally vulcanized adhesive member, the end portion of the tapered metal fitting on the small diameter side faces the plate portion of the second end metal fitting at a predetermined distance, and Since they are connected by the third rubber elastic body having an annular space between them, excessive displacement in the axial direction of the inner cylinder fitting and the mounting plate can cause the tapered fitting and the second end fitting to Therefore, unlike conventional cushion rubber assemblies, the rubber elastic body (third rubber elastic body) is damaged by contact with the metal member. This can be effectively avoided. Therefore, the durability of the rubber elastic body and ultimately the cushion rubber assembly can be greatly improved. In addition, since the relative displacement in the axial direction between the inner cylinder fitting and the mounting plate is prevented based on the contact between the tapered fitting and the second end fitting, the rubber elastic body may be excessively deformed. Therefore, the deformation of the orifice forming member is effectively prevented from being applied to the orifice forming member through the rubber elastic body (first rubber elastic body). It also has the advantage of being able to prevent this from happening.

Moreover, according to the present invention, the annular recess between the inner cylindrical fitting of the first integrally vulcanized adhesive member and the second rubber elastic body is closed by the plate portion of the first end fitting. Since a fluid chamber (first fluid chamber) of Therefore, the amount of incompressible fluid flowing through the orifice is increased by increasing the amount of incompressible fluid passing through the orifice relative to the amount of relative displacement in the axial direction between the inner cylinder fitting and the mounting plate. Another advantage is that the vibration damping function based on the fluid flow effect or the inertial mass effect can be sufficiently effectively exhibited.

Note that the fluid-filled cushion rubber assembly according to the present invention is attached to the shaft member so that the load in the compression direction mainly acts on the third rubber elastic body, and the load in the tension direction acts on the second rubber elastic body. Because it is interposed between the inner cylinder fitting and the mounting plate, the stopper function in the axial direction between the inner cylinder fitting and the mounting plate works only in the direction in which the mounting plate and the second end fitting approach each other, as described above. It is enough.

(Example) Hereinafter, in order to clarify the present invention more specifically, one example thereof will be described in detail based on the drawings.

First, in FIGS. 1 and 2, 10 is
It is an inner cylindrical metal fitting into which a predetermined shaft member is inserted and attached, and a thick-walled annular partition rubber 12, which is a first rubber elastic body, extends radially outward on the outer circumferential surface of the axially intermediate portion thereof. They are vulcanized and bonded together in an extended state. A first orifice forming fitting 1 having an annular shape is formed on the outer peripheral surface of the partition rubber 12.
4 is integrally vulcanized and bonded at its inner peripheral portion.

More specifically, the first orifice forming fitting 1
4 is a U-shaped portion 16 on the inner peripheral side that opens in the axial direction.
An annular caulking portion 18 is provided on the outside of this U-shaped portion 16 and extends in the opening direction of the U-shaped portion 16, and a base end portion of this caulking portion 18 and an outer circumferential wall 20 of the U-shaped portion 16 are connected to each other. It consists of a flange-shaped connecting part 22 that connects to the tip end part, and is integrally vulcanized and bonded to the partition rubber 12 on the inner circumferential wall 24 of the U-shaped part 16.

Then, a second orifice forming metal fitting 28 having an annular shape with a flat plate-like cross section is connected to the connecting portion 22 of the first orifice forming metal fitting 14 in a state of closing the U-shaped groove 26 in the U-shaped part 16. These two orifice forming fittings 1 are overlapped with each other.
An annular orifice 30 with a predetermined cross-sectional area between 4 and 28
is formed. In this embodiment, the first and second orifice forming metal fittings 14 and 28 constitute an orifice forming member.

Note that the second orifice forming metal fitting 28 is
As shown in the figure, a rubber layer 32 of a predetermined thickness is applied to the outer circumferential surface of the tip end of the inner circumferential wall 24 of the first orifice forming fitting 14 through a rubber layer 32 of a predetermined thickness disposed on the outer circumferential surface of the inner circumferential wall 24. The inner circumferential surface of the orifice 30 is press-fitted, thereby closing the inner circumferential portion of the orifice 30 in a fluid-tight manner.

Further, as shown in FIG. 3, an annular seal lip 34 is integrally formed at the tip of the outer peripheral wall 20 of the U-shaped portion 16 of the first orifice forming fitting 14. The outer periphery of the orifice 30 is closed off in a fluid-tight manner by being compressed with the second orifice forming metal fitting 28.

Further, as shown in FIG. 1 and FIG. A cutout hole 38 and a through hole 40 are formed at positions approximately half a circumference apart from each other, thereby allowing first and second fluid chambers 42 and 44, which will be described later, to communicate with each other through the orifice 30. It is being Furthermore, here,
The second orifice forming metal fitting 28 has a cutout hole 38
Instead, it is also possible to form a through hole similar to the first orifice forming fitting 14.

In this embodiment, the connecting portion 22 of the first orifice forming fitting 14 as described above is overlapped with the surface opposite to the extending direction of the caulked portion 18 at the inner peripheral portion. An annular mounting plate 46 is fixed by welding, and a rubber sleeve 48, which is a second rubber elastic body, extends from the inner circumference of the mounting plate 46 in a direction opposite to the direction in which the caulked portion 18 extends. One end is integrally vulcanized and bonded, and an annular caulking metal fitting 50 is integrally vulcanized and bonded to the other end of the rubber sleeve 48.
In this embodiment, this constitutes the first integrally vulcanized adhesive member 52.

Note that the mounting plate 46 is bolted to a predetermined mounting member through a through hole 54 formed in the outer circumference.

Further, as shown in FIG. 3, the rubber sleeve 48 is configured such that its free end protrudes a predetermined amount outward in the axial direction from the end surface of the inner cylinder fitting 10 in the unassembled state. However, as shown in FIG. 1, in the assembled state, its end portion substantially coincides with the end surface of the inner cylindrical fitting 10. In the cushion rubber assembly of this embodiment, the rubber sleeve 48, which is the second rubber elastic body, is pre-compressed to a predetermined degree in the axial direction thereof.

By the way, such a first integrally vulcanized adhesive member 52 includes one end portion of the inner cylindrical metal fitting 10 and the caulking metal fitting 5.
An annular first end fitting 56 is fluid-tightly assembled integrally with the other end of the inner cylindrical fitting 10 and the first orifice forming fitting 1.
A second integrally vulcanized adhesive member 58 is fluid-tightly assembled across the caulked portion 18 of the rubber sleeve 48 and the inner cylindrical fitting 10. A first fluid chamber 42 is formed, and an annular second fluid chamber is formed, facing the first fluid chamber 42 in the axial direction with the orifice forming fittings 14, 28 and the partition rubber 12 in between. 44 is formed. A predetermined incompressible fluid such as water, polyalkylene glycol, silicone oil, etc. is sealed in these fluid chambers 42 and 44 to form a fluid-filled cushion rubber assembly as shown in FIGS. 1 and 2. A solid is constructed.

That is, the first end fitting 56 includes an annular plate portion 60 and a cylindrical portion 62 extending from the inner peripheral portion of the plate portion 60 in one direction in the axial direction.
It consists of. While the cylindrical portion 62 is press-fitted and fixed to the inner peripheral surface of one end of the inner cylindrical fitting 10, the outer peripheral edge of the plate portion 60 is crimped by the metal fitting 5.
By caulking and fixing at 0, it is integrally assembled to the first integrally vulcanized adhesive member 52, and thereby, as shown in FIG. The opening of the annular recess between the inner cylindrical fitting 10 of the member 52 and the rubber sleeve 48 is closed to form the first fluid chamber 42.

Note that, as shown in FIG. 3, partition rubber 12 is provided on the end surface of the inner cylindrical metal fitting 10 and the inner circumference of the caulking metal fitting 50 against which the plate portion 60 of the first end metal fitting 56 comes into contact. and annular sealing lips 64, 66 integrally with the rubber sleeve 48.
are formed, and these seal lips 64, 6
6 is pinched between the plate portion 60 of the end fitting 56, thereby ensuring fluid tightness of the first fluid chamber 42.

On the other hand, the second integrally vulcanized adhesive member 58 assembled on the other end side of the inner cylinder fitting 10 is arranged concentrically with the annular second end fitting 68 at a predetermined distance in the axial direction. Tapered cylindrical tapered metal fitting 7
0, and an annular rubber ring 72 as a third rubber elastic body that elastically connects the end fittings 68 and the tapered fittings 70. and,
The end fitting 68 is integrally assembled to the inner cylindrical fitting 10, while the tapered fitting 70 is integrally assembled to the first orifice forming fitting 14, and is integrally assembled to the first integrally vulcanized adhesive member 52. assembled, thereby creating a first integrally vulcanized adhesive member 52, as shown in FIG.
An annular second fluid chamber 44 is formed between the two.

More specifically, the second end fitting 68
As shown in the figure, the first end fitting 5
6, it consists of an annular plate portion 74 and a cylindrical portion 76 extending from the inner peripheral portion of the plate portion 74 in one direction in the axial direction, and the second end fitting 68 The cylindrical portion 76 is press-fitted into the inner circumferential surface of the other end of the inner cylindrical fitting 10 and is integrally assembled with the first integrally vulcanized adhesive member 52 . Note that the plate portion 74 of the second end fitting 68
As shown in FIG.
A seal lip 78 similar to 4 is formed,
By squeezing this seal lip 78 between the plate portion 74 and the inner cylindrical metal fitting 10, fluid tightness of the assembled portion at the inner peripheral portion of both integrally vulcanized adhesive members 52, 58 is ensured. .

Further, the tapered metal fitting 70 is arranged such that the end portion on the small diameter side faces the outer peripheral portion of the plate portion 74 of the second end fitting 68 with a predetermined distance therebetween,
An outward flange portion 80 is integrally located at the end on the large diameter side and serves as a portion to be caulked. Then, by fixing the outward flange portion 80 with the caulking portion 18 of the first orifice forming metal fitting 14, the first integrally vulcanized adhesive member 5
2 is integrally assembled. In addition, on the inner peripheral part of the outward flange part 80 of the tapered metal fitting 70,
As shown in FIG. 4, an annular seal lip 82 is formed integrally with the rubber ring 72, and when this seal lip 82 is pressed between the second orifice forming fitting 28, Furthermore, as described above, since the outer periphery of the orifice 30 is fluid-tightly closed by the seal lip 34, fluid-tightness of the assembly portion at the outer periphery of both integrally vulcanized adhesive members 52 and 58 is ensured. There is.

In this embodiment, as shown in FIG. , a rubber ring 72 having a substantially tapered cylindrical shape with an annular space 73 opening radially outward and having a predetermined distance formed between the small-diameter end of the tapered metal fittings 70 and the plate portion 74. are integrally vulcanized and adhered to each other, thereby forming an annular second fluid chamber 44 between the first integrally vulcanized adhesive member 52 and the first integrally vulcanized adhesive member 52, as shown in FIG. It is being done.

Note that, as is clear from FIG.
8 and are formed in such a manner that they cover the surfaces facing each other with a predetermined thickness.

Further, the assembly operation of the second integrally vulcanized adhesive member 58 and the first end fitting 56 to the first integrally vulcanized adhesive member 52 is normally performed in a predetermined incompressible fluid. Thereby, the incompressible fluid is sealed in the first and second fluid chambers 42, 44 at the same time as they are formed.

According to the fluid-filled cushion rubber assembly having such a configuration, when a vibration load is input in the axial direction of the shaft member, each rubber elastic body (the partition rubber 12, the rubber sleeve 48, and the rubber ring 72) undergoes elastic deformation. As the volume of the fluid chambers 42, 44 changes due to the change in the volume of the fluid chambers 42, 44, the incompressible fluid sealed in the fluid chambers 42, 44 is formed in orifice forming members (orifice forming fittings 14, 28) fixed in position on the mounting plate 46. They are caused to mutually flow through the circumferential orifice 30, and based on the flow action or inertial mass effect of the incompressible fluid flowing through the orifice 30, a good vibration damping function can be obtained against the input vibration. It is. In this embodiment, the first fluid chamber 42 is formed in the annular recess formed in the first integrally vulcanized adhesive member 52 between the inner cylindrical fitting 10 and the rubber sleeve 48, as described above. The first fluid chamber 4 is formed as a fluid storage space and has a significantly large volume (see FIG. 1).
The rubber sleeve 48 constituting the outer circumferential wall of the inner cylinder 10 and the mounting plate 46 is positively elastically deformed in accordance with the relative displacement of the inner cylinder fitting 10 and the mounting plate 46 in the axial direction. Since the amount of flow (passing amount) of the incompressible fluid through the orifice 30 is increased with respect to the relative displacement in the axial direction of the The effect can be demonstrated extremely effectively.

Further, as described above, the cushion rubber assembly of this embodiment has a first integrally vulcanized adhesive member 52 in which the first orifice forming metal fitting 14 and the second orifice forming metal fitting 28 are stacked on top of each other. Since it can be configured by simply assembling the end fitting 56 and the second integrally vulcanized adhesive member 58, its assemblability is extremely excellent, and since the number of parts to be assembled is small, The sealing performance against incompressible fluids has also been significantly improved compared to conventional methods.

Furthermore, in this embodiment, as described above, in the second integrally vulcanized adhesive member 58, the plate portion 74 of the second end fitting 68 and the end portion on the small diameter side of the tapered fitting 70 are separated by a predetermined distance. A rubber ring 72 having an annular cavity 73 and arranged to face each other across the
Since they are connected by
This reliably prevents excessive displacement in the axial direction. Therefore, unlike conventional cushion rubber assemblies, the rubber ring 72 is not damaged by contact with metal members, and excessive displacement of each rubber elastic body can be effectively prevented. The durability of the assembly can be greatly improved. In addition, it is possible to effectively avoid applying an excessive load to the orifice forming metal fittings 14 and 28, thereby preventing deformation of the orifice forming metal fittings 14 and 28, and in this sense as well, the cushion rubber assembly The durability of the three-dimensional structure can be improved.

In addition, in the cushion rubber assembly of this example,
As described above, since the opposing surfaces of the plate portion 74 of the second end fitting 68 and the tapered fitting 70 are each covered with a portion of the rubber ring 72, the plate portion 74 and the tapered fitting 70 are covered with a portion of the rubber ring 72. and are brought into elastic contact via a portion of the rubber ring 72.

Furthermore, as is clear from the above description, in the cushion rubber assembly of this embodiment, the load in the compression direction is mainly applied to the rubber ring 72, which is the third rubber elastic body.
Further, the rubber sleeve 48, which is the second rubber elastic body, is used in a form in which a load in the tensile direction is applied to the rubber sleeve 48, which is the second rubber elastic body.

One embodiment of the present invention has been described in detail above, but
This is a literal example, and it goes without saying that the present invention should not be construed as being limited to this specific example.

For example, in the embodiment described above, the orifice forming member was constituted by the first orifice forming metal fitting 14 having the U-shaped portion 16 and the second orifice forming metal fitting 28 having a flat plate-like cross section. It is also possible to adopt other cross-sectional shapes and assembly structures as the orifice forming metal fittings, and the orifice 30 is not necessarily limited to those that utilize an annular space as in the above embodiments, but may also be circular. It is possible to adopt various shapes as necessary, such as one that utilizes an arcuate space.

Furthermore, the seal lip at each assembly portion of the integrally vulcanized adhesive members 52, 58 and the first end fitting 56 may be formed on the opposite side of the member from the above embodiment, if necessary. be.

In addition, the shapes and structures of each member will not be listed one by one, but it goes without saying that the present invention can be implemented with various changes, modifications, improvements, etc., without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view (-cross-sectional view in FIG. 2) showing an example of a fluid-filled cushion rubber assembly according to the present invention, and FIG. 2 is a cross-sectional view (-cross-sectional view in FIG. 1). 3 and 4 respectively show the shapes of the integrally vulcanized adhesive members of the cushion rubber assembly of FIG. 1 before assembly, and FIG. 3 shows the first integrally vulcanized adhesive member. 4 is a sectional view corresponding to FIG. 1 showing the second integrally vulcanized adhesive member. 10... Inner cylinder metal fitting, 12... Partition rubber (first rubber elastic body), 14... First orifice forming metal fitting, 18... Caulking portion, 28... Second orifice forming metal fitting, 30... Orifice, 34, 64,
66, 78, 82... Seal lip, 42... First fluid chamber, 44... Second fluid chamber, 46... Mounting plate, 48... Rubber sleeve (second rubber elastic body), 50... Caulking metal fitting, 52...First integrally vulcanized adhesive member, 56...First end metal fitting, 5
8...Second integrally vulcanized adhesive member, 60...Plate part (of the first end fitting), 62...Cylindrical part (of the first end fitting), 68...Second end part Metal fittings, 7
0...Tapered metal fitting, 72...Rubber ring (third rubber elastic body), 73...Annular cavity, 74...Plate part (of the second end fitting), 76...Cylindrical part (second ), 80...outward flange portion (caulked portion) of the end fitting.

Claims (1)

[Utility Model Claims] A cushion rubber device interposed between a specified shaft member and a mounting member to absorb vibrations input mainly in the axial direction of the shaft member, comprising: an inner tubular metal member through which the shaft member is inserted and mounted; an annular first rubber elastic body integrally vulcanized and bonded to the outer circumferential surface of the axially intermediate portion of the inner tubular metal member and extending radially outward; an annular orifice-forming member having an inner circumferential portion integrally vulcanized and bonded to the outer circumferential portion of the first rubber elastic body and an outer circumferential portion integrally fixed to the inner circumferential portion of an annular mounting plate mounted on the mounting member, the annular orifice-forming member having an inner circumferential portion integrally vulcanized and bonded to the outer circumferential portion of the orifice-forming member and/or the inner circumferential portion of the mounting plate at one end in the axial direction, the second rubber elastic body being cylindrical and integrally vulcanized and bonded to the outer circumferential portion of the orifice-forming member and/or the inner circumferential portion of the mounting plate at one end in the axial direction in a state extending to the opposite side to the crimped portion, forming an annular recess that opens in the axial direction between the inner tubular metal member and the second rubber elastic body;
a first integrally vulcanized adhesive member having an annular crimping metal fitting integrally vulcanized and bonded to the other axial end side of the second rubber elastic body; a first annular end fitting having an annular plate portion and a cylindrical portion extending from an inner peripheral portion of the plate portion in one direction in the axial direction, the first annular end fitting being press-fitted and fixed to the inner peripheral surface of one end of the inner tubular fitting at the cylindrical portion while the crimping metal fitting is crimped and fixed to the outer peripheral edge of the plate portion, thereby being integrally assembled to the first integrally vulcanized adhesive member; and a first annular fluid chamber formed by fluid-tightly closing an opening of an annular recess between the inner tubular fitting and the second rubber elastic body with the first end fitting. a second integrally vulcanized bonded member having: an annular second end fitting which is positioned on the inner circumferential part of a circular plate portion and which extends in one direction in the axial direction; a tapered cylindrical tapered fitting which is positioned on its large diameter side and has an outwardly crimped portion located at its large diameter side end and which is arranged so that its small diameter end faces the plate portion of the second end fitting at a predetermined distance in the extension direction of the cylindrical portion of the second end fitting; and an annular third rubber elastic body which is integrally vulcanized and bonded to the small diameter end of the tapered fitting and the plate portion of the second end fitting in a state in which an annular space of a predetermined interval which opens radially outward is formed between them, and the second integrally vulcanized bonded member is press-fitted and fixed at the cylindrical portion of the second end fitting into the inner circumferential surface of the other end of the inner cylindrical fitting, while the crimped portion of the orifice forming member is crimped and fixed to the crimped portion of the tapered fitting, thereby integrally assembled to the first integrally vulcanized bonded member; a second annular fluid chamber formed between the first integrally vulcanized adhesive member and the second integrally vulcanized adhesive member by assembling the second integrally vulcanized adhesive member to the first integrally vulcanized adhesive member, a predetermined incompressible fluid sealed in the second fluid chamber and the first fluid chamber, and a circumferential orifice formed in the orifice forming member in a state in which the first and second fluid chambers communicate with each other, wherein the incompressible fluids sealed in the first and second fluid chambers flow mutually through the circumferential orifice to damp vibrations input in the axial direction of the shaft member.