JP2750850B2 - Fluid-filled anti-vibration bush - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled anti-vibration bush,
Particularly, the present invention relates to a fluid-filled anti-vibration bush having excellent durability. [0002] Conventionally, a plurality of fluid chambers have been provided between an inner cylinder member and an outer cylinder member connected via a rubber elastic body, and a non-compressible fluid sealed in the fluid chambers has been provided. An orifice allowing mutual flow, based on the inertial mass effect or liquid column resonance action of the incompressible fluid flowing through the orifice, the input vibration in the bush radial direction in the frequency range corresponding to the tuning frequency of the orifice A fluid-filled anti-vibration bush, which can effectively attenuate the vibration, is known, and is used for a cylindrical engine mount of an FF vehicle, a suspension bush of an automobile suspension, and the like. [0003] In such a fluid-filled type vibration-isolating bush, conventionally, a fluid chamber in which an incompressible fluid is filled has a pocket portion formed of a cylindrical rubber elastic body and a fluid accommodating space. The inner cylindrical member and the outer cylindrical member are connected by a rubber elastic body along their entire circumference (see Japanese Patent Publication No. 48-36151 and Japanese Patent Publication No. 52-16554). . For this reason, in a conventional fluid-filled anti-vibration bush of this type, when a predetermined preload is applied in a vibration input direction in a use state, such as a cylindrical engine mount of an FF vehicle, a rubber elastic body is used. It is inevitable that a tensile force acts on a part, and when a large amplitude vibration is input, the tensile force becomes extremely large, and the durability of the rubber elastic body and, consequently, the durability of the vibration isolating bush are significantly reduced. There was a problem. [0004] The present invention has been made in view of such circumstances, and a problem to be solved is that a predetermined preload is applied in the vibration input direction in a state of use. Even in such a case, it is an object of the present invention to provide a fluid-filled vibration-proof bush that does not significantly reduce the durability of the rubber elastic body and, consequently, the vibration-proof bush. In order to solve such a problem, a fluid-filled anti-vibration bush according to the present invention comprises: (a) an inner cylinder member; and (b) a vibration input direction outside the inner cylinder member. (C) an outer cylinder member disposed eccentrically and (c) interposed between the inner cylinder member and the outer cylinder member on the side where the separation distance is larger, to elastically couple the inner cylinder member and the outer cylinder member. (D) a rubber elastic body provided with a pocket portion opened on the outer peripheral surface, which is connected to the inner cylindrical member and the outer cylindrical member; And (e) a pressure-receiving pressure filled with a predetermined incompressible fluid formed by closing the opening of the pocket portion of the rubber elastic body in a fluid-tight manner with the outer cylinder member. Room and
(F) In a through space provided between the inner cylinder member and the outer cylinder member, the mounting cylinder is separated in the mount circumferential direction from a portion facing the inner cylinder member in the eccentric direction of the inner cylinder member and the outer cylinder member. The rubber elastic body is formed so as to be at least partially defined by a thin wall portion which is easily swelled and deformed independently of the rubber elastic body, but is not defined by the rubber elastic body. Further, it is configured to include an equilibrium chamber in which the same incompressible fluid as the pressure receiving chamber is sealed, and (g) an orifice for communicating the equilibrium chamber and the pressure receiving chamber with each other. The equilibrium chamber may be formed in the through space at a position separated from the portion of the inner and outer cylinder members facing the inner cylinder member in the eccentric direction of the inner cylinder member only on one side in the mount circumferential direction. Preferably, a pair of such equilibrium chambers are formed in the through space and at positions respectively separated on both sides in the mount circumferential direction from a portion where the inner cylinder member and the outer cylinder member oppose each other in the eccentric direction of the outer cylinder member. You. [0007] The thin-walled portion may be any one that can easily change the volume of the equilibrium chamber by defining at least a part of the equilibrium chamber. An equilibrium chamber is formed by forming a bag-like structure that is disposed in the through space and opens to the outer peripheral surface, and the outer peripheral surface opening of the thin wall portion is fluid-tightly closed by the outer cylindrical member. Further, according to the present invention, in the through space, the inner cylindrical member is located at a position facing the inner cylindrical member in the eccentric direction of the outer cylindrical member, and spreads along the inner peripheral surface of the outer cylindrical member. It is preferable that the rubber layer is formed integrally with the thin rubber layer and has a thickness larger than that of the thin rubber layer. Further, in the present invention, the wall portions on both sides in the circumferential direction of the pocket portion formed by the rubber elastic body are provided.
As a whole, it is preferable to have a V-shaped cross-sectional shape that extends from the inner cylinder member side to the side where the separation distance in the eccentric direction between the inner cylinder member and the outer cylinder member is larger. Further, in the present invention, a seal sleeve is adhered to the outer peripheral surface of the rubber elastic body, and windows are formed on both sides of the seal sleeve in the eccentric direction with respect to the inner cylindrical member, respectively. The pocket portion is opened through a window provided at a portion having a large eccentric distance from the inner cylinder member, while the thin wall portion is formed as a bag-like rubber elastic film, and the bag-like rubber elastic film is formed inside the seal sleeve. A window provided on a portion having a small eccentric distance from the cylindrical member is adhered so as to close from the inside, and the outer cylindrical member is fitted to the seal sleeve in a fluid-tight manner to close the window of the seal sleeve. It is preferable that the pressure receiving chamber and the equilibrium chamber are formed by squeezing. [0011] More preferably, an orifice groove is provided to extend over the outer peripheral surface of the seal sleeve between both windows, and the orifice groove is closed by an outer cylindrical member so that the orifice is closed. It is formed. Still further, in the present invention, in the through space, the inner cylindrical member projects from the inner cylindrical member side toward the outer cylindrical member side, and the inner cylindrical member and the inner cylindrical surface of the through hollow space on the outer cylindrical member side. It is desirable to provide a stopper member facing the eccentric direction of the outer cylinder member. In the fluid-filled anti-vibration bush constructed in accordance with the present invention, when vibration is input in the vibration input direction, the vibration is applied to the radial displacement between the inner cylindrical member and the outer cylindrical member. As a result, a fluid pressure difference is generated between the pressure receiving chamber and the equilibrium chamber, and as a result, the incompressible fluid sealed in the pressure receiving chamber and the equilibrium chamber is caused to flow mutually through the orifice. Therefore, similar to the conventional fluid-filled type vibration-isolating bush, the input vibration in the frequency range corresponding to the tuning frequency of the orifice is based on the inertial mass effect or the liquid column resonance action of the incompressible fluid flowing through the orifice. Can be satisfactorily attenuated. Further, in such a fluid-filled type vibration-isolating bush, the fluid-filled type vibration-isolating bush is located at a position where the separation distance between the inner cylinder member and the outer cylinder member in the eccentric direction is small, and penetrates in the bush axis direction. Since the cavity is formed, even when a preload is applied in the vibration input direction in use, the rubber elastic body can be compressed and deformed by the preload, so that the rubber can be deformed by the preload. It is possible to prevent a large tensile force from acting on the elastic body. Therefore, even in the case where a large amplitude vibration is input in the vibration input direction, it is possible to satisfactorily prevent an excessive tensile force from acting on the rubber elastic body. In the case where the rubber elastic body is used, it is possible to satisfactorily prevent the durability of the rubber elastic body and the vibration isolating bush from being significantly reduced. Further, in the fluid filled type vibration damping bush according to the present invention, the equilibrium chamber is formed in a form independent of the rubber elastic body so as not to be defined by the rubber elastic body. Therefore, the direct tensile force accompanying the relative displacement of the inner and outer cylinder members when a preload is applied or when vibration is applied acts on the equilibrium chamber, particularly on the thin wall portion that defines it. Can be effectively avoided,
It also has a feature that the durability reliability as a vibration isolating bush can be advantageously secured. In addition, in the fluid-filled anti-vibration bush according to the present invention, since the equilibrium chamber is formed so as to avoid a portion opposed to the inner cylinder member in the eccentric direction of the inner and outer cylinder members, the preparatory chamber is formed. Even when the inner and outer cylinder members are relatively displaced when a load is applied or vibration is input, interference and contact of the inner cylinder members and the like with the thin wall defining the equilibrium chamber are effectively avoided. This has the advantage that the durability of the thin wall portion and thus the vibration isolating bush can be further improved. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, an example in which the present invention is applied to a cylindrical engine mount used for anti-vibration support of a power unit of an FF vehicle will be described. One embodiment will be described in detail with reference to the drawings. First, in FIGS. 1 to 3, reference numerals 10 and 16 denote a cylindrical inner cylinder fitting as an inner cylinder member and a cylindrical outer cylinder fitting as an outer cylinder member, respectively. It is eccentrically arranged in the direction by a predetermined amount, and is elastically connected by a substantially semi-cylindrical rubber elastic body 14 interposed therebetween. The engine mount of the present embodiment is mounted on the power unit side including the engine or the vehicle body side at the inner hole 18 of the inner cylinder fitting 10, and is mounted on the vehicle body side or the power unit side with the outer cylinder fitting 16 to connect the power unit to the vehicle body. It is designed to support vibration isolation. Here, the rubber elastic body 14 is used for the inner cylindrical fitting 10.
On the side of the eccentric direction between the outer cylinder fitting 16 and the outer cylinder fitting 16, the part is interposed between the two fittings 10, 16, and the part on the side with the smaller eccentric spacing distance between the two fittings 10, 16. Is formed in a substantially arc-shaped cross section so as to penetrate in the axial direction of the mount. The rubber elastic body 14 is configured to be compressed and deformed in the eccentric direction between the inner cylindrical member 10 and the outer cylindrical member 16 by the attachment of the power unit. The inner tube fitting 10 and the outer tube fitting 16 are positioned substantially concentrically. Further, the rubber elastic body 14 is integrally vulcanized and bonded to the outer peripheral surface of the inner cylindrical fitting 10 on the inner peripheral surface thereof.
The seal sleeve 12 is integrally vulcanized and adhered to the outer peripheral surface thereof so as to enclose the space 34. The outer sleeve 16 is fitted to the outer peripheral surface of the seal sleeve 12 in a fluid-tight manner. The rubber elastic body 14 is formed integrally with a rubber layer of a predetermined thickness that goes around the cavity 34 as shown in the figure. As shown in FIGS. 4 to 7, the seal sleeve 12 fixed to the outer peripheral surface of the rubber elastic body 14 has the inner cylindrical metal fitting 10 in the eccentric direction of the metal fittings 10, 16. And a pair of windows 20 and 22
A pair of circumferential orifice grooves 24 and 26 are formed on the outer peripheral surface of the seal sleeve 12 so as to connect the two windows 20 and 22. Further, on the outer peripheral surface of the seal sleeve 12 excluding the openings of the orifice grooves 24, 26, a seal rubber layer 30 having a predetermined thickness and having seal lips 28, 28 at both ends in the axial direction is provided with a rubber elastic body. 14 and vulcanized and formed integrally. On the other hand, as shown in FIG. 4 and FIG.
The pocket portion 3 having a predetermined depth is opened in the
2 are formed. Further, in the portion of the seal sleeve 12 facing the space 34, both ends of the other window portion 22 of the seal sleeve 12 which are separated from each other in the mount circumferential direction are closed from the inside, so that the swelling displacement is easy. The bag-like rubber elastic films 36 and 38 as thin thin wall portions are integrally vulcanized and bonded in a form substantially separate from the rubber elastic body 14, whereby the window of the seal sleeve 12 is formed. A pair of recesses 40 having a predetermined depth and opening into the portion 22;
42 are formed. In addition, as is apparent from FIGS. 4 and 5, the seal sleeve 1 between the recesses 40 and 42 is provided.
The portion of the second window 22 is covered with a rubber layer having a predetermined thickness integrally formed with the rubber elastic films 36 and 38 and the rubber elastic body 14. Here, as described above, the outer cylindrical member 16 is fitted to the outer peripheral surface of the seal sleeve 12 in a fluid-tight manner, so that the window portions 20,
22, the pocket portion 32 and the recesses 40, 4
2 are closed in a fluid-tight manner, and the pressure receiving chamber 44 and the pair of equilibrium chambers 4 each having the interior space of the pocket 32 and the recesses 40 and 42 as a fluid accommodating space.
6 and 48, and the orifice groove 2
The orifices 50 and 52 for communicating between the pressure receiving chamber 44 and the balancing chambers 46 and 48 are closed by fluid-tight closing of the openings 4 and 26.
Are formed respectively. Here, the fitting operation of the outer cylinder fitting 16 to the seal sleeve 12 is performed in a predetermined incompressible fluid, so that the pressure receiving chamber 4
A predetermined incompressible fluid such as water, an alkylene glycol, a polyalkylene glycol, a low molecular weight polymer or the like is sealed in the chamber 4 and the equilibrium chambers 46 and 48. The outer sleeve 16 is fixed to the seal sleeve 12 by performing an octagonal drawing process. Further, the engine mount of the present embodiment can be passed through a predetermined die after the fitting operation of the outer tube fitting 16,
Although the outer dimensions are set to desired dimensions, alternatively, after the fitting operation of the outer cylindrical member 16, the outer cylindrical member 16 may be squeezed to have a predetermined outer diameter. Further, the orifices 50, 52 have their cross-sectional areas and lengths set corresponding to vibrations in a predetermined low frequency range, so that the orifices 50, 52 flow through or are located there. Based on the inertial mass effect or the liquid column resonance action of the incompressible fluid, vibrations in the low frequency range corresponding to the tuning frequencies of the orifices 50 and 52 are favorably attenuated. As shown in FIGS. 4 to 6, the outer peripheral surface of the inner cylindrical fitting 10 is located at the center in the axial direction, and its longitudinal direction is the fittings 10 and 16. A stopper member 54 in the form of a longitudinal block having a predetermined thickness is press-fitted and fixed in its central hole 56 in a state in which the eccentric direction coincides with the eccentric direction. The both ends 58 and 60 of the stopper metal fitting 54 in the longitudinal direction correspond to the pocket 32 (the pressure receiving chamber 4).
4) and a predetermined height in each of the cavities 34.
The excessive relative displacement in the eccentric direction between the inner cylindrical member 10 and the outer cylindrical member 16 is prevented based on the fact that the both end portions 58 and 60 of the 4 abut on the inner peripheral surface of the outer cylindrical member 16. I have. The surface of the stopper fitting 54 projecting toward the cavity 34 is covered with a cushioning rubber layer having a predetermined thickness formed integrally with the rubber elastic body 14. Further, as clearly shown in FIG. 1, the equilibrium chambers 46, 48 are separated from both sides of the inner cylinder 10 in the eccentric direction of the inner and outer cylinders 10, 16 on both sides in the mount circumferential direction. The equilibrium chambers 46 and 48 are not formed at positions radially opposed to the protruding distal end surfaces of the stopper fittings 54 on the rubber elastic films 36 and 38 on the side of the cavity 34 on the cavity 34 side. Thereby, even when a large preload or vibration load is input between the inner and outer cylindrical fittings 10 and 16, the interference and contact of the stopper fitting 54 with the rubber elastic films 36 and 38 can be effectively avoided. I have. As shown in FIGS. 4 and 5, a female screw hole 62 is formed in the distal end surface of the end portion 58 of the stopper fitting 54 protruding into the pressure receiving chamber 44. As shown in FIGS. 1 and 2, the male screw 64 screwed into the female screw hole 62
A rectangular plate-like laterally extending member 66 having a substantially arc-shaped cross-section is fixed so that the outer peripheral edge extends laterally around the end 58 of the stopper fitting 54. Then, when the inner cylindrical member 10 and the outer cylindrical member 16 are relatively moved in the eccentric direction by vibration input, the inner cylindrical member 10 and the outer cylindrical member 16 are formed between the outer peripheral edge of the laterally extending member 66 and the inner wall of the pressure receiving chamber 44. The incompressible fluid is made to flow in the mount radial direction through the annular constriction 67. In this embodiment, based on the inertial mass effect or the liquid column resonance action of the incompressible fluid flowing through the constriction 67, the input vibration in the frequency range set for the constriction 67, that is, the vibration input Direction (both brackets 10 and 1
6 in the eccentric direction) and the input vibration in the frequency range corresponding to the ratio of the length l (see FIGS. 1 and 2) to the cross-sectional area (the area of the constriction 67 in the direction perpendicular to the vibration input direction). Also, a good vibration-proof effect can be obtained. The constriction 67 is tuned to a frequency higher than the tuning frequency of the orifices 50 and 52. In addition, as shown in FIGS. 1 and 2, here, a reinforcing member 68 fixed to the end portion 58 of the stopper member 54 by a male screw 64 and integrally vulcanized on the outer surface thereof. A laterally extending member 66 is formed from the buffer rubber layer 70 having a predetermined thickness. The buffer rubber layer 70 has a through hole 72 formed therein for screwing the male screw 64 into the female screw hole 62. I have. In order to support the power unit using the engine mount having such a structure, the rubber elastic member 1 is attached by attaching the power unit as described above.
4 can be compressed and deformed in the eccentric direction of the inner cylinder fitting 10 and the outer cylinder fitting 16. In this way, when vibration is input in the vibration input direction, which is the eccentric direction between the inner cylindrical member 10 and the outer cylindrical member 16, the fluid pressure difference between the pressure receiving chamber 44 and the equilibrium chambers 46, 48 is obtained. Is induced, and the pressure receiving chamber 44 and the equilibrium chambers 46 and 48
The incompressible fluid enclosed in the fluid is caused to flow through the orifices 50 and 52 mutually based on the swelling / shrinking deformation of the rubber elastic films 36 and 38 that define the equilibrium chambers 46 and 48. Of the fluid-filled cylindrical engine mounts described above, based on the inertial mass effect or liquid column resonance of the incompressible fluid flowing through or located in the orifices 50,52. Therefore, a good damping effect can be exerted on input vibration in a low frequency range corresponding to the tuning frequency. In this embodiment, when a vibration is input in the vibration input direction and the inner cylinder 10 and the outer cylinder 16 are displaced relative to each other in the eccentric direction, the squeezed portion 67 formed in the pressure receiving chamber 44 passes. Since the incompressible fluid is caused to flow in the radial direction of the mount, as described above, the constriction portion is formed based on the inertial mass effect or the liquid column resonance effect of the incompressible fluid flowing through the constriction portion 67. There is also an advantage that input vibration in a high frequency range corresponding to the tuning frequency of 67 can be satisfactorily cut off. When the power unit is supported for vibration isolation as described above, on the side of the eccentric direction between the inner cylindrical member 10 and the outer cylindrical member 16 where the separation distance is small, due to the weight load of the power unit. Both metal fittings 1
The separation distance between 0 and 16 increases. Therefore, like the conventional fluid-filled cylindrical engine mount, both metal fittings 1
In the case where the rubber elastic bodies 0 and 16 are connected by a cylindrical rubber elastic body, the rubber elastic body part of the part where the separation distance between the metal fittings 10 and 16 becomes large is large based on the weight load of the power unit. Tensile force will be applied,
When a large-amplitude vibration is input, a larger tensile force is applied, and the durability of the rubber elastic body and, consequently, the engine mount is significantly reduced. However, in the engine mount of this embodiment, as described above, the two metal fittings 10, 16 in the eccentric direction are used.
On the side of the side where the separation distance is small, the metal fittings 10 and 16 are not connected by the rubber elastic body 14 and the space 34 penetrating in the axial direction of the mount is provided. Both brackets 1 by load
Even if the separation distance between 0 and 16 becomes large, only the void 34
The gap size of the rubber elastic body 14 is not increased, and a large tensile force is not applied to the rubber elastic body 14. Therefore,
Even when a large-amplitude vibration is input, an excessive tensile force is effectively prevented from acting on the rubber elastic body 14, and the durability of the rubber elastic body 14, and consequently, the durability of the engine mount is significantly reduced. Will be avoided. As described above, according to the cylindrical engine mount according to this embodiment, the rubber elastic body 14 is used in such a form that the rubber elastic body 14 is compressed and deformed between the inner cylindrical fitting 10 and the outer cylindrical fitting 16 so that the conventional structure can be obtained. As well as the fluid-filled cylindrical engine mount, it can exert a good damping effect on the input vibration in the low frequency range, and its durability is improved compared to the conventional fluid-filled cylindrical engine mount. This makes it possible to obtain more practicality than conventional fluid-filled cylindrical engine mounts. Further, in the cylindrical engine mount of this embodiment, the equilibrium chambers 46 and 48 are not defined by the rubber elastic body 14, and therefore, the rubber elastic film separate from the rubber elastic body 14. From the areas defined by 36 and 38, it is effective that a tensile force acts directly on the rubber elastic films 36 and 38 by applying a weight load (preload) of the power unit or inputting vibration. Therefore, it is possible to advantageously secure the durability reliability of the rubber elastic films 36 and 38, and furthermore, the vibration-proof bush. Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention is not limited to such a specific example, and various modifications may be made without departing from the spirit of the present invention. It goes without saying that the present invention can be implemented in a mode in which changes, modifications, improvements, and the like are made. For example, in the above embodiment, the equilibrium chambers 46, 4
The recesses 40 and 42 of the equilibrium chambers 46 and 48 are formed in such a manner that the recesses 40 and 42 of the equilibrium chambers 46 and 48 are formed such that each of the windows 22 of the seal sleeve 12 has an opening.
Can be formed in a state in which mutually independent windows formed in the seal sleeve 12 are used as openings. It is also possible to employ only one of the equilibrium chambers 46 and 48 as the equilibrium chamber. In the above embodiment, the equilibrium chambers 46, 48
Rubber elastic films 36, 3 as thin wall portions that define a part of
8 is provided so as to be integrally bonded to the seal sleeve 12, but the thin wall portion is not necessarily required to be provided so as to be integrally bonded to the seal sleeve 12, and the thin wall portion is formed separately from the seal sleeve. It is also possible to construct and equilibrate the equilibrium chamber mechanically on the sealing sleeve. Further, in the above-described embodiment, an example has been described in which the present invention is applied to a cylindrical engine mount of an FF vehicle. However, the present invention relates to a suspension bush for an automobile and the like.
The present invention can be applied to a vibration isolating bush or a vibration isolating mount other than the cylindrical engine mount of the FF vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a cylindrical engine mount for an FF vehicle according to the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 1; FIG. 4 is a cross-sectional view corresponding to FIG. 1, showing an integrally vulcanized molded product of a rubber elastic body in the engine mount of FIG. 1; FIG. 5 is a sectional view taken along line VV in FIG. 4; FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a sectional view taken along the line VII-VII in FIG. 4; DESCRIPTION OF SYMBOLS 10 Inner tube fitting (inner tube member) 12 Seal sleeve 14 Rubber elastic body 16 Outer tube fitting (outer tube member) 32 Pocket portion 34 Vacancy 36, 38 Rubber elastic film (thin wall portion) 40, 42 Recess 44 Pressure receiving chamber 46, 48 Equilibrium chamber 50, 52 Orifice

Claims (1)

(57) [Claims] An inner cylinder member, an outer cylinder member disposed eccentrically in the vibration input direction outside the inner cylinder member, and interposed at a portion where the separation distance between the inner cylinder member and the outer cylinder member is larger. A rubber elastic body having a pocket portion opened to the outer peripheral surface for elastically connecting the inner cylinder member and the outer cylinder member, and a rubber elastic body having a small separation distance between the inner cylinder member and the outer cylinder member. A predetermined incompressibility formed by a space provided in the portion and penetrating in the axial direction of the bush, and an opening of the pocket portion of the rubber elastic body being fluid-tightly closed by the outer cylindrical member. A pressure receiving chamber filled with a fluid, and a through space provided between the inner cylinder member and the outer cylinder member, a portion facing the inner cylinder member in an eccentric direction of the inner cylinder member and the outer cylinder member. The rubber elastic body is located at a position separated from the mount in the circumferential direction. Is at least partially defined by an independent thin wall portion that is easily swellable and deformable, while being formed so as not to be defined by the rubber elastic body. A fluid-filled anti-vibration bush, comprising: a balancing chamber filled with a fluid; and an orifice for interconnecting the balancing chamber and the pressure receiving chamber. 2. The equilibrium chamber is formed as a pair in the through space, at a position separated from the opposing portion of the inner cylinder member in the eccentric direction of the inner cylinder member and the outer cylinder member on both sides in the mount circumferential direction. The fluid-filled anti-vibration bush according to claim 1. 3. The thin wall portion has a bag-like structure disposed in the through space and opening to the outer peripheral surface, and the outer peripheral surface opening of the thin wall portion is closed in a fluid-tight manner by the outer cylindrical member. The fluid-filled anti-vibration bush according to claim 1 or 2, wherein the equilibrium chamber is formed. 4. In the through space, a rubber layer is located at a position facing the inner cylinder member in the eccentric direction of the inner cylinder member and the outer cylinder member, and extends along the inner peripheral surface of the outer cylinder member. The fluid-filled anti-vibration bush according to any one of claims 1 to 3, wherein the fluid-filled anti-vibration bush is formed integrally with the rubber layer and with a thickness larger than the thin rubber layer. 5. The wall portions on both sides in the circumferential direction of the pocket portion formed by the rubber elastic body are generally directed from the inner cylinder member side to the side where the separation distance in the eccentric direction of the inner cylinder member and the outer cylinder member is larger. The fluid-filled anti-vibration bush according to any one of claims 1 to 4, wherein the fluid-filled anti-vibration bush has a V-shaped cross section that expands. 6. A seal sleeve is adhered to an outer peripheral surface of the rubber elastic body, and windows are formed on both sides of the seal sleeve in an eccentric direction with respect to the inner cylinder member, and eccentricity of the seal sleeve with the inner cylinder member is formed. The pocket portion is opened through a window portion provided at a portion on a longer distance side, while the thin wall portion is formed as a bag-like rubber elastic film, and the bag-like rubber elastic film is formed as a seal sleeve. Is bonded so as to close the window provided on the side of the eccentric distance with the inner cylinder member on the small side from the inside,
2. The pressure receiving chamber and the equilibrium chamber are formed by fitting the outer cylinder member to the seal sleeve in a fluid-tight manner and closing a window of the seal sleeve.
6. A fluid-filled anti-vibration bush according to any one of claims 1 to 5. 7. An orifice groove extending over the outer peripheral surface of the seal sleeve between the window portions is provided, and the orifice is formed by closing the orifice groove with the outer cylindrical member. 7. The fluid-filled anti-vibration bush according to 6. 8. In the through space, the inner cylindrical member and the outer cylindrical member protrude from the inner cylindrical member side toward the outer cylindrical member side, and are eccentric with respect to an inner peripheral surface of the through hollow space on the outer cylindrical member side. 2. A stopper member which is opposed in the direction is provided.
8. A fluid-filled anti-vibration bush according to any one of claims 1 to 7.