JPH0229899B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a vibration-isolating bushing that is inserted into a vibration system of an automobile or the like to perform a vibration-damping function, and particularly relates to a fluid-filled bushing that has good vibration damping performance. be.

(Prior Art) A vibration-proof bushing used by being inserted into a vibration system of an automobile, etc., includes an inner cylinder member and an outer cylinder member arranged concentrically at a certain distance on the outside thereof,
Some are designed primarily to prevent vibrations in the radial direction that are applied between the inner cylinder member and the outer cylinder member.

Conventionally, in this type of anti-vibration bushing, a ring-shaped rubber elastic body is interposed between the inner cylinder member and the outer cylinder member, either alone or as a composite with synthetic resin, canvas, etc.
Attenuation or isolation of vibrations has been attempted based on the elastic deformation of the rubber elastic body. However, it is difficult to satisfy both vibration damping and isolation by only elastic deformation of rubber elastic bodies, so in recent years, while vibration is isolated by elastic deformation of rubber elastic bodies, BACKGROUND OF THE INVENTION Fluid-filled bushes have been proposed in which vibrations are damped or insulated by utilizing flow resistance or resonance effect when an incompressible fluid passes through an orifice. For example, fluid-filled bushes disclosed in Japanese Patent Publication No. 48-36151 and Japanese Patent Publication No. 52-16554 are examples of such fluid-filled bushes.

(Problems to be Solved by the Invention) However, in the fluid-filled bushes disclosed in these publications, the pocket, which is sealed with an incompressible fluid and communicated with by an orifice, is
formed at intervals in the circumferential direction of an annular rubber elastic body,
Due to the load applied in the radial direction of the rubber elastic body,
Since the volume of these pockets is changed to allow incompressible fluid to pass through the orifice, a good damping or insulating effect can be obtained against vibrations in the radial direction of the rubber elastic body. The problem is that the volume of each pocket changes in the same way in response to an axial load, so incompressible fluid does not pass through the orifice, and therefore vibration damping or insulation can hardly be expected. It was hot.

(Means for Solving the Problems) The fluid-filled bushing according to the present invention has been developed in view of the above-mentioned circumstances, and its gist consists of (a) an inner cylindrical member; b) an outer cylinder member disposed concentrically with the inner cylinder member at a predetermined distance apart from the inner cylinder member and forming a predetermined annular space therebetween; and (c) the inner cylinder member. and a deformable end portion that connects both ends of the outer cylinder member in the axial direction to each other to form the annular space formed between them into a closed space with both ends of the outer cylinder member closed in the axial direction. a connecting means; (d) fitted between the inner cylindrical member and the outer cylindrical member and integrally attached to one of the members;
Slidingly abutted against the peripheral surface of the other member in a substantially fluid-tight manner to partition the annular sealed space in the radial direction and form two fluid chambers in the axial direction; (e) partition means having a cylindrical rubber elastic body for supporting the radial force between the inner cylinder member and the outer cylinder member; a compressible fluid; and (f) orifice means for interconnecting the two fluid chambers and permitting flow of the compressible fluid between the fluid chambers.

(Operations and Effects) In such a fluid-filled bush, two fluid chambers containing an incompressible fluid are formed in the axial direction, and these fluid chambers are communicated with each other by an orifice means. Therefore, when a load based on axial vibration is applied between the inner cylinder member and the outer cylinder member, the pressure in one fluid chamber increases due to deformation of the end connecting means, and the pressure in the other fluid chamber increases. A pressure difference occurs between the
This causes incompressible fluid in one fluid chamber to flow into the other fluid chamber through the orifice means. In other words, vibrations in the axial direction are attenuated or insulated by the flow resistance and resonance effect when the incompressible fluid passes through the orifice means.

Moreover, in the present invention, the partition member that partitions the two fluid chambers is made slidable on the circumferential surface of either the inner cylinder member or the outer cylinder member, and the deformation of the end closing means in the axial direction is Since this is done efficiently by the load applied in the axial direction without being restricted by the partition means, the volumes of both fluid chambers can be efficiently changed to damp or insulate vibrations. There is also the advantage of being able to obtain effects effectively.

In other words, according to the fluid-filled bush of the present invention, it is possible to obtain a good damping or insulation effect against vibrations in the axial direction.

Further, according to the present invention, as described above, since the partition member that partitions the two fluid chambers is slidable on the circumferential surface of either the inner cylinder member or the outer cylinder member, There is an advantage that the rigidity in the radial direction and that in the axial or torsional direction can be set separately.

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

First, FIGS. 1 and 2 show a longitudinal cross-sectional view and a cross-sectional view of an automobile suspension bushing (A-type control arm bushing) which is an embodiment of the present invention. In these figures, reference numeral 10 denotes an inner metal fitting that is an inner cylinder member, and includes a cylindrical metal fitting 14 into which a predetermined mounting shaft 12 is inserted and fixed, and an annular restraint plate fixed to one end of the cylindrical metal fitting 14. It consists of 16. As shown in FIG. 3, a thin caulked portion 18 is formed at one end of the cylindrical metal fitting 14, and by caulking the caulked portion 18, the restraint plate 16 is inserted into the center hole 20. It is integrally fixed to the cylindrical metal fitting 14 in the form of a flange at the peripheral edge. Further, as shown in FIGS. 3 and 4, the other end of the cylindrical metal fitting 14 has a small diameter portion 2 over a certain length in the axial direction.
2 is formed, and a caulking portion 24 similar to the caulking portion 18 described above is formed at the tip of the small diameter portion 22.

In addition, in FIGS. 1 and 2, 26 is
The cylindrical metal fitting 14 is an outer metal fitting that is an outer cylindrical member that is fitted and fixed into a mounting hole of a predetermined mounting member 28.
are placed concentrically at a certain distance outside the
A predetermined annular space is formed between the cylindrical metal fitting 14 and the cylindrical metal fitting 14.

The restraining plate 1 between the cylindrical metal fitting 14 and the outer metal fitting 26
At the end in the axial direction on the side where the ring 6 is fixed, a relatively thick annular rubber elastic body 30 is vulcanized and bonded at its inner and outer circumferential parts, so that the annular space is one end of which is fluid-tightly closed. Further, on the inner peripheral surface of the outer metal fitting 26, a thin rubber layer 32 integrally formed with the rubber elastic body 30 is formed over almost the entire length.
As shown in the figure, two seal lips 33 are provided in the circumferential direction at the end opposite to the rubber elastic body 30.
is formed. The annular rubber elastic body 30 includes a disk-shaped portion that faces the restraint plate 16 in close proximity to the outer metal fitting 26 and a cylindrical portion that is substantially parallel to the outer metal fitting 26 .
The outer fitting 20 can be deformed by loads in the radial direction and the axial direction, respectively. However, the outward deformation of the rubber elastic body 30 in the axial direction is limited to a certain amount by the restraining plate 16.

On the other hand, a thinner annular rubber elastic body 38 that is easier to deform than the rubber elastic body 30 is provided at the end of the annular space opposite to the side closed by the annular rubber elastic body 30. It is being As shown in FIGS. 5 and 6, this rubber elastic body 38 includes an inner cylindrical metal fitting 40 and an outer cylindrical metal fitting 42 that are arranged concentrically on the inner and outer circumferential parts thereof. The peripheral portion and the outer peripheral portion are vulcanized and bonded to the outer peripheral surface of the inner cylindrical metal fitting 40 and the inner peripheral surface of the outer cylindrical metal fitting 42, respectively. Further, as is clear from FIG. 5, one end surface of the inner cylinder fitting 40 is covered with a rubber elastic body 38.

The inner cylinder fitting 40 is provided with a protrusion 44 on the inner peripheral edge of the opening opposite to the end surface covered with the rubber elastic body 38, and as shown in FIG. is positioned at the caulked portion 24 of the cylindrical metal fitting 14, and tightly fitted into the small diameter portion 22 of the cylindrical metal fitting 14. The caulking portion 24 is then fixed to the cylindrical metal fitting 14 by caulking. Also, at this time, the inner cylinder fitting 4 of the rubber elastic body 38
A portion covering the end face of the inner cylindrical member 40 is held between the end face of the inner cylindrical member 40 and the stepped surface 47 of the cylindrical member 14, thereby maintaining fluid tightness between the inner cylindrical member 40 and the cylindrical member 14. ing.

The outer cylindrical metal fitting 42 is fitted into the outer metal fitting 26 in a pre-compressed state, and is prevented from coming off by inward roll caulking of the end of the outer metal fitting 26. Further, the portion of the outer metal fitting 26 corresponding to the outer cylindrical metal fitting 42 is subjected to an eight-way drawing process, and the space between them is maintained fluid-tight by the seal lip 33 of the rubber layer 32 interposed therebetween. ing.

In other words, the remaining one end of the annular space is fluid-tightly closed by the annular rubber elastic body 38. As is clear from this,
In this embodiment, the annular rubber elastic bodies 30 and 38 constitute an end connecting means. As shown in FIGS. 1 and 5, the rubber elastic body 38 has a bent shape in which the center portions of the metal fittings 40 and 42 protrude outward in the axial direction.

An annular partition member 46 is fitted into the axial center of the annular space whose both ends are closed by the annular rubber elastic bodies 30 and 38 . As shown in FIGS. 7 and 8, the partition member 46 includes an outer sleeve 48 and an inner sleeve 50 made of metal, which are arranged concentrically with each other, and the sleeves 48 and 50 at the outer and inner peripheries. and a cylindrical rubber elastic body 52 vulcanized and bonded to 50.
and a resin sleeve 54 made of synthetic resin that is press-fitted and fixed to the inner sleeve 50, and as shown in FIGS. The resin sleeve 54 is press-fitted and fixed in a fluid-tight manner, and is substantially fluid-tightly fitted to the cylindrical fitting 14 on the inner circumferential surface of the resin sleeve 54, so that the annular space is connected to the annular rubber elastic body 30 side. It is divided into two, a first fluid chamber 56 and a second fluid chamber 58 on the annular rubber elastic body 38 side. In the fluid chambers 56 and 58 partitioned by the partition member 46, an incompressible fluid such as water, polyalkylene glycol, silicone oil, or a low molecular weight polymer is sealed.
Furthermore, the resin sleeve 54 is slidable on the outer peripheral surface of the cylindrical metal fitting 14. Note that the outer metal fitting 26 and the outer sleeve 48 of the partition member 46
The rubber layer 32 maintains fluid tightness between the two. The rubber layer 32 is formed between the outer metal fitting 26 and the outer cylinder metal fitting 42 and between the outer metal fitting 26 and the outer sleeve 4.
This is a common sealing rubber layer between 8 and 8.

As shown in FIGS. 7 and 8, the inner circumferential surface of the resin sleeve 54 of the partition member 46 has a pair of grooves 60 parallel to the axis and facing each other across the axis. It is formed. These grooves 60
As shown in Figures 1 and 2,
The opening is covered by the outer peripheral surface of the cylindrical metal fitting 14, thereby forming a pair of communication passages 62 that connect the two fluid chambers 56 and 58. These communicating passages 62 constitute orifice means, and when a pressure difference occurs between the fluid chambers 56 and 58, the fluid is discharged from the fluid chamber on the higher pressure side to the lower pressure side through these communicating passages 62. Incompressible fluid can flow into the fluid chamber.

Further, as shown in FIGS. 7 and 8, the rubber elastic body 52 has an axial length that is approximately 1/4 of the circumference centered on one radial direction orthogonal to each other. It is long in the range, and short in the range of approximately 1/4 of the circumference centered on the other radial direction,
As a result, the rigidity in the one radial direction is made larger than that in the other radial direction.

By the way, the suspension bushing as described above is manufactured in the following manner.

First, the cylindrical metal fitting 14 and the outer metal fitting 26 before caulking are set in a predetermined mold, a rubber elastic material is injected into the gap between them, and the annular rubber elastic body 30 and the rubber layer 32 are vulcanized. Both metal fittings 14 are molded and set in the mold.
and 26 are vulcanized and bonded to the rubber elastic body 30 and the rubber layer 32. Further, separately from this, the annular rubber elastic body 38 and the partition member 46 are manufactured.

Next, the partition member 46 is pre-compressed in a predetermined incompressible fluid and inserted between the outer fitting 26 and the cylindrical fitting 14, and after the fitting, the annular rubber member is also placed in the incompressible fluid. Elastic body 3
8 is pre-compressed and inserted between them. Then, the caulking portion 24 is caulked,
An inner cylindrical fitting 40 of the annular rubber elastic body 38 is fixed to the cylindrical fitting 14 in a fluid-tight manner. In addition, the outer metal fitting 26
is drawn in all directions to maintain fluid tightness between the annular rubber elastic body 38 and the outer cylindrical fitting 42, and then roll caulking is performed on the end of the outer fitting 26,
The outer cylinder fitting 42 is prevented from coming off from the outer fitting 26. Finally, the caulking portion 18 is caulked to fix the restraint plate 16 to the cylindrical metal fitting 14.

In this way, the fluid chambers 56 and 58 can be formed and the incompressible fluid can be sealed in the fluid chambers 56 and 58 at the same time.
It becomes possible to perform the operation of enclosing an incompressible fluid into the interiors of 6 and 58 quickly, and it becomes possible to increase the productivity of the suspension bush. Note that the cylindrical fitting 14 and the outer fitting 26 are connected to the fluid chambers 56 and 5.
8, the shape is as shown in FIGS. 3 and 4.

With the suspension bush as described above being interposed between the predetermined mounting shaft 12 and the mounting member 28, the first When a vibration load is applied to the left in the figure, the inner metal fitting 10 moves relative to the outer metal fitting 26 in the left direction in the figure, and the rubber elastic body 30 of the annular rubber elastic body forming the end connecting means The rubber elastic body 3 is compressed and deformed in the axial direction.
8 is tensilely deformed in the axial direction. Further, at this time, as described above, since the resin sleeve 54 is slidable with respect to the cylindrical fitting 14 of the inner fitting 10, the partition member 46 moves relative to the inner fitting 10 in the right direction in the figure. As a result, the volume on the first fluid chamber 56 side is efficiently reduced and the pressure is effectively increased, while the volume on the second fluid chamber 58 side is efficiently increased and the pressure is effectively reduced. A large amount of incompressible fluid is caused to flow through the communication path 62 from the first fluid chamber 56 side to the second fluid chamber 58 side. In other words, vibrations are favorably damped based on the flow resistance of the incompressible fluid flowing through the communication path 62, the resonance effect, and the like. Moreover, in this embodiment, as described above, the axially outward bulge of the rubber elastic body 30 is caused by the restraining plate 16.
, the elastic deformation of the rubber elastic bodies 30, 38 and, as a result, the fluid chamber 56,
There is an advantage that the volume change of 58 is performed more efficiently and the vibration damping effect is performed better. In addition,
The increased volume of the second fluid chamber 58 is caused by the rubber elastic body 38
is compensated for by expanding outward in the axial direction.

On the other hand, when a vibration load is applied in a direction opposite to the P direction, the inner fitting 10 moves relative to the outer fitting 26 and the partition member 46 in the right direction in FIG. The pressure on the fluid chamber 58 side increases, and the pressure on the first fluid chamber 56 side decreases. As a result, the incompressible fluid in the second fluid chamber 58 flows into the first fluid chamber 56 through the communication path 62. In other words, a good vibration damping effect can be obtained by the flow resistance of the incompressible fluid, the resonance effect, and the like.

In this way, according to this embodiment, a good vibration damping effect can be obtained against vibrations applied in the axial direction. Note that the vibration applied in the radial direction is
Mainly the cylindrical rubber elastic body 52 of the partition member 46
It will be cut off or damped based on the elastic deformation of.

Although one embodiment of the present invention has been described above, this is a literal illustration, and the present invention should not be interpreted as being limited to this specific example.

For example, in the embodiment described above, the inner metal fitting 10 as an inner cylindrical member was configured by integrally fixing the cylindrical metal fitting 14 and the restraining plate 16 by caulking. may have been done. Further, a restraining means such as the restraining plate 16 for restricting the axially outward expansion of the annular rubber elastic body 30 is not necessarily required, and the cylindrical metal fitting 14 may simply be used as an inner cylinder member.

Furthermore, in the embodiment described above, the annular rubber elastic body 30 is vulcanized and bonded to the cylindrical fitting 14 and the outer fitting 26 at the inner and outer peripheral portions, thereby closing one end of the annular space between them. However, like the other annular rubber elastic body 38, the rubber elastic body 30
It is also possible to close the end of the annular space by providing an inner cylindrical metal fitting and an outer cylindrical metal fitting on the inner and outer peripheries of the annular space and fixing the inner cylindrical metal fitting and the outer cylindrical metal fitting to the cylindrical metal fitting 14 and the outer metal fitting 26 by caulking. be. In addition, in this case, the restraint means can be provided on the inner cylinder metal fitting.

Further, in the embodiment, between the outer metal fitting 26 and the outer cylinder metal fitting 42 of the annular rubber elastic body 38, and between the outer metal fitting 26 and the outer sleeve 48 of the partition member 46,
The rubber layer 32 formed on the inner circumferential surface of the outer metal fitting 26 maintains fluid tightness between them.
It may be held by a rubber layer or the like formed on the outer circumferential surface of.

Further, in the embodiment described above, a groove 60 is formed in the inner circumferential surface of the resin sleeve 54 of the partition member 46, and the opening of this groove 60 is covered with the outer circumferential surface of the cylindrical metal fitting 14. However, the communication passage 62 serving as the orifice means is formed by covering the opening of a groove formed on the outer circumferential surface of the cylindrical metal fitting 14 with the inner circumferential surface of the resin sleeve 54. Alternatively, it may be formed by a groove provided between the resin sleeve 54 and the inner sleeve 50 or between the outer sleeve 48 and the outer metal fitting 26. In addition, the resin sleeve 5
4, the inner sleeve 50, the outer sleeve 48, etc., and use this as the orifice means.A dedicated tube may be embedded in the rubber elastic body 52 of the partition member 46 in the axial direction, and the It is also possible to employ the space within the tube as an orifice means. Furthermore, the communication passages serving as the orifice means do not necessarily have to be formed as a pair with the axis in between, as in the above embodiments, and the number and position of the communication passages are determined depending on the vibration frequency to be attenuated or insulated, the non-compressible It is determined as appropriate by considering factors such as the viscosity constant of the fluid, the cross-sectional area of each communication path, and the length thereof.

Further, in the embodiment, a metal inner sleeve 50 is attached to the inner circumference of the rubber elastic body 52 of the partition member 46.
A resin sleeve 54 is fitted and fixed into the inner sleeve 50, and the cylindrical fitting 14 is slidably fitted into the resin sleeve 54 in a substantially fluid-tight manner. The resin sleeve 54 may be directly provided on the inner circumference of the rubber elastic body 52 by vulcanization adhesion, or the cylindrical metal fitting 1 may be directly attached to the inner sleeve 50.
4 may be inserted.

Further, in the above description, the partition member 46 was brought into slidable contact with the outer peripheral surface of the cylindrical metal fitting 14 in a substantially fluid-tight manner, but the inner peripheral surface of the partition member 46 was brought into contact with the outer peripheral surface of the cylindrical metal fitting 14. While fluid-tightly fixing the outer circumferential surface of the partition member 46 to the outer circumferential surface of the partition member 46,
The same effect can be obtained even if the cover is slidably abutted in a substantially fluid-tight manner against the inner circumferential surface of the cover.

Further, in the embodiment, in order to make the rigidity in the radial direction different in the circumferential direction, the partition member 4
Although the axial length of the rubber elastic body 52 of No. 6 was supposed to differ in the circumferential direction, the radial rigidity does not necessarily have to be different in the circumferential direction, and the axial length of the rubber elastic body 52 It is also possible to make the length uniform over the entire circumference. In addition to the case where no sleeve is interposed within the rubber elastic body 52 as in the above example, by embedding a rigid plate integrally in the rubber elastic body 52 over a predetermined length in the circumferential direction, It is also possible to make the radial rigidity different in the circumferential direction, and it is also possible to uniformly increase the radial rigidity by embedding an intersleeve integrally in the rubber elastic body 52.

Further, in the above embodiment, the present invention was applied to a suspension bushing of an automobile, but the present invention can also be applied to other anti-vibration bushings such as member mounts, cab mounts, body mounts, and strut bark bushings. The invention can also be applied to strut mounts, etc., and can also be applied to anti-vibration bushings for vehicles other than automobiles.

Although not listed in detail, it goes without saying that the present invention can be implemented with various modifications and improvements within the scope of the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, and corresponds to the - section in FIG. 2. FIG. 2 is a cross-sectional view of FIG. 1. FIG. 3 is a longitudinal cross-sectional view showing the state of the cylindrical metal fitting and the outer metal fitting before caulking, and corresponds to the - cross section in FIG. 4. FIG. 4 is a left side view of FIG. 3.
FIG. 5 is a longitudinal sectional view of one of the annular rubber elastic bodies in the embodiment shown in FIG. 1, and corresponds to the - section in FIG. 6. FIG. 6 is a left side view of FIG. 5. FIG. 7 is a longitudinal sectional view of the partition member in the embodiment of FIG. 1, and corresponds to the - section in FIG. 8. FIG. 8 is a left side view of FIG. 7. 10: Inner metal fitting (inner cylinder member), 14: Cylindrical metal fitting,
16: Restriction plate (restraint means), 18, 24: Caulking part, 26: Outer metal fitting (outer cylinder member), 30, 38:
Rubber elastic body (end closing means), 32: Rubber layer, 3
3: Seal lip, 40: Inner cylinder metal fitting, 42: Outer cylinder metal fitting, 46: Partition member, 48: Outer sleeve,
50: Inner sleeve, 52: Rubber elastic body, 54:
Resin sleeve, 56, 58: Fluid chamber, 60:
Groove, 62: communication path (orifice means).

Claims (1)

[Scope of Claims] 1. An outer cylinder member arranged concentrically at a predetermined distance apart from the inner cylinder member and so as to form a predetermined annular space between the inner cylinder member and the inner cylinder member; The cylindrical member and the outer cylindrical member are deformable by connecting both axial ends of the outer cylindrical member to each other to form the annular space formed between them into a closed space in which both axial ends are closed. an end connecting means that is fitted between the inner cylindrical member and the outer cylindrical member, is integrally attached to one of the members, and is substantially attached to the circumferential surface of the other member; between the inner cylindrical member and the outer cylindrical member, the inner cylindrical member and the outer cylindrical member being slidably abutted in a fluid-tight manner to partition the annular sealed space in the radial direction and form two fluid chambers in the axial direction; a partition means having a cylindrical rubber elastic body for supporting radial force; a predetermined incompressible fluid sealed in each of the two fluid chambers; the two fluid chambers communicating with each other; orifice means for allowing flow of the compressible fluid between the fluid chambers. 2. The partition member has a resin cylinder on the inner circumference of the cylindrical rubber elastic body, and the resin cylinder can slide substantially fluid-tightly with respect to the inner cylinder member. A fluid-filled bushing according to claim 1 as extrapolated. 3. The partition member includes an innermost resin cylindrical body that is slidably fitted onto the inner cylindrical member in a substantially fluid-tight manner, and an outermost resin cylindrical body that is fitted and fixed in the outer cylindrical member in a fluid-tight manner. an outer sleeve;
The fluid-filled bushing according to claim 1, wherein the cylindrical rubber elastic body is interposed between the resin cylinder and the outer sleeve. 4. The partition member includes an outermost outer sleeve that is fluid-tightly fitted and fixed within the outer cylinder member, an inner sleeve that is disposed concentrically within the outer sleeve, and an inner sleeve that is fitted and fixed within the inner sleeve. and a resin cylindrical body that is slidably fitted onto the inner cylindrical member in a substantially fluid-tight manner,
The fluid-filled bushing according to claim 1, wherein the cylindrical rubber elastic body is interposed between the inner sleeve and the outer sleeve. 5 A patent in which a sealing rubber layer is formed on at least one of the mutually opposing surfaces between the outer cylinder member and the outer sleeve of the partitioning member, and the space between them is maintained fluid-tight by the sealing rubber layer. A fluid-filled bushing according to claim 3 or 4. 6. The orifice means is formed by covering a groove provided in either one of the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the resin cylinder of the partition member with the peripheral surface of the other. A fluid-filled bushing according to any one of claims 2 to 5. 7. The fluid-filled bushing according to any one of claims 1 to 6, wherein the cylindrical rubber elastic body of the partition member has different lengths in the axial direction in the circumferential direction. . 8. Claims in which the end connecting means includes two deformable annular rubber elastic bodies, and each of the two annular rubber elastic bodies closes one end of the annular space in the axial direction. The fluid-filled bush according to any one of items 1 to 7. 9. The fluid-filled bushing according to claim 8, wherein one of the two annular rubber elastic bodies of the end connecting means is configured to be more easily deformable than the other. 10 The wall thickness of one annular rubber elastic body of the end connecting means is made thinner than the other one, so that the one annular rubber elastic body deforms more easily than the other one. A fluid-filled bushing according to claim 9, which is adapted to obtain. 11. The inner cylindrical member is provided with a restraining means that faces the other annular rubber elastic body in close proximity to the other annular rubber elastic body at an axial end of the end connecting means, and 11. The fluid-filled bushing according to claim 9, wherein axial outward deformation of the other annular rubber elastic body is restricted. 12 At least one of the two annular rubber elastic bodies of the end connecting means has an inner cylindrical metal fitting integrally fixed to the inner peripheral part and an outer cylindrical metal fitting integrally fixed to the outer peripheral part. , the inner cylindrical fitting is fluid-tightly fitted and fixed to the axial end of the inner cylindrical member, and the outer cylindrical fitting is fluid-tightly fitted and fixed to the axial end of the outer cylindrical member. The fluid-filled bush according to any one of claims 8 to 11, wherein one end of the annular space in the axial direction is thereby closed. 13 A sealing rubber layer is formed on at least one of mutually opposing surfaces of the outer cylindrical fitting of the annular rubber elastic body of the end connecting means and the outer cylindrical member, and the sealing rubber layer maintains fluid tightness between them. 13. A fluid-filled bushing as claimed in claim 12. 14. Claim 12, wherein the outer cylindrical metal fitting of the annular rubber elastic body of the end connecting means is prevented from coming off from the outer cylindrical member by caulking the axial end of the outer cylindrical member. 14. The fluid-filled bushing according to item 1 or 13. 15. The inner cylinder fitting of the annular rubber elastic body of the end connecting means is fixed to the inner cylinder member by being caulked to the axial end of the inner cylinder member. Range 12th to 1st
The fluid-filled bush according to any of Item 4. 16 One of the two annular rubber elastic bodies of the end connecting means has its inner peripheral part and outer peripheral part integrally fixed to the inner cylindrical member and the outer cylindrical member, respectively, so that the annular space is closed. The fluid-filled bushing according to any one of claims 8 to 15, wherein one end in the axial direction is closed.