JP2005163839A - Fluid sealing type cylindrical vibration damper and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid sealing type cylindrical vibration damper formed so that an increase in the durability of a body rubber elastic body and the securement of fluid sealability can be advantageously realized by effectively applying a specified pre-compression to the body rubber elastic body and a working efficiency can be remarkably increased by easily realizing an operation to apply the pre-compression to the body rubber elastic body and an operation to install an outer cylindrical member to a middle sleeve. <P>SOLUTION: The middle sleeve 18 is formed of a pair of annular split cylindrical bodies 20 and 22 arranged apart from each other in the axial direction. The pair of annular split cylindrical bodies 20 and 22 are fixedly positioned by the outer cylindrical member 14 so as to have an axial separate distance smaller than a separate distance of the pair of annular split cylindrical bodies 20 and 22 in the axial direction in the unit body of an integrated vulcanized molding 30. Accordingly, the axial pre-compression is given to the body rubber elastic body 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluid-filled cylindrical vibration damping device that obtains a vibration-proofing effect based on the flow action or the like of a fluid sealed inside, and for example, an automotive engine mount, body mount, differential mount, and suspension bushing. The present invention relates to a fluid-filled cylindrical vibration isolator having a novel structure that can be suitably used as a device and a method for manufacturing the same.

  Conventionally, as a kind of anti-vibration coupling body interposed between members constituting a vibration transmission system, for example, as shown in Patent Documents 1 to 3, inner shaft members that are spaced apart from each other in the radial direction And the outer cylinder member are connected by a main rubber elastic body, and a fluid chamber is formed between the radially opposed surfaces of the inner shaft member and the outer cylinder member, and resonance action and shear in the incompressible fluid sealed in the fluid chamber are formed. 2. Description of the Related Art There is known a fluid-filled cylindrical vibration damping device that obtains a vibration damping effect using a fluid action such as a shearing action. In such a cylindrical vibration isolator, it is possible to obtain an effective anti-vibration effect that is difficult to obtain with a rubber elastic body alone against vibration in a specific frequency range based on the fluid flow action. Application to suspension bushes, engine mounts, body mounts, etc. for automobiles is being studied.

  Moreover, such a cylindrical vibration isolator is generally manufactured as follows. First, the inner shaft member and the intermediate sleeve are spaced apart in the radial direction in a predetermined mold, and the main rubber elastic body is added to the molding cavity defined between the radially opposed surfaces of the inner shaft member and the intermediate sleeve. By vulcanization molding, an integrally vulcanized molded product in which the inner shaft member and the intermediate sleeve are connected by the main rubber elastic body is obtained. In such an integrally vulcanized molded product, a pocket portion is provided in the main rubber elastic body, and the pocket portion is opened to the outer peripheral surface through a window portion provided in the intermediate sleeve. Then, the outer cylinder member is fitted and fixed to the integrally vulcanized molded product in the incompressible fluid, the window portion is covered to form a fluid chamber in which the incompressible fluid is sealed, and the target fluid An encapsulated cylindrical vibration isolator is obtained.

  By the way, in such a cylindrical vibration isolator, there is a possibility that tensile stress may remain in the rubber elastic body due to heat shrinkage or the like during vulcanization molding of the main rubber elastic body. There is a risk of adversely affecting the durability and spring characteristics of the vibration isolator.

  Therefore, in order to deal with such problems, conventionally, after the vulcanization molding of the main rubber elastic body, using a predetermined drawing die for eight-way drawing or sixteen-way drawing, the intermediate vulcanization molded product It has been proposed to reduce or eliminate the tensile stress by applying a radial pre-compression to the main rubber elastic body by reducing the diameter of the sleeve.

  However, in the above-described cylindrical vibration isolator, after the main rubber elastic body is integrally vulcanized and molded into the drawing die, the intermediate sleeve is subjected to diameter reduction processing to pre-compress the main rubber elastic body. Take out the integrally vulcanized molded product from the drawing die, attach the outer cylinder member to the integrally vulcanized molded product and assemble it, then set it again in another drawing die and reduce the diameter of the outer cylinder member As a result, it is necessary to fit and fix the outer cylinder member to the intermediate sleeve, and there is a problem that the operation is very troublesome and takes time.

  In particular, the drawing processing for the intermediate sleeve and the drawing processing for the outer cylindrical member are different in processing size, so it is necessary to prepare different drawing dies and perform drawing processing, which makes the manufacture and handling of the drawing dies more troublesome. It was.

  In addition, in such a cylindrical vibration isolator, a plurality of window portions for opening the pocket portions are formed in the intermediate sleeve attached to the outer peripheral surface of the main rubber elastic body, and a separate orifice member Since the intermediate sleeve has a complicated shape, for example, a concave portion for fitting the rubber elastic body is formed, a stable drawing process is performed on the intermediate sleeve when drawing the rubber elastic body after vulcanization molding. There was a problem that it was difficult to apply. Therefore, the intermediate sleeve is deformed by the drawing process, and it is difficult to exert the desired precompression on the main rubber elastic body, and the sealing performance between the outer cylinder member and the intermediate sleeve is lowered. There is also a possibility that problems such as difficulty in ensuring sufficient fluid tightness may occur.

Japanese Utility Model Publication No. 61-202738 JP-A 63-130945 Japanese Patent Laid-Open No. 62-224746

  The present invention has been made in the background as described above, and the problem to be solved is that the intended pre-compression is effectively applied to the main rubber elastic body, so that the main rubber elastic body is durable. In addition to being able to advantageously improve performance and ensure fluid tightness, the work of pre-compressing the main rubber elastic body and the work of assembling the outer cylinder member to the intermediate sleeve are easily realized. It is an object to provide a fluid-filled cylindrical vibration isolator having a novel structure that can dramatically improve the efficiency and a novel manufacturing method thereof.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized on the basis of.

(Aspect 1 of the present invention relating to a fluid-filled cylindrical vibration isolator)
A feature of the first aspect of the present invention relating to the fluid-filled cylindrical vibration isolator is that the main body rubber is disposed between the inner shaft member and an intermediate sleeve disposed at a predetermined distance on the outer peripheral side of the inner shaft member. An elastic body is disposed, the inner shaft member and the intermediate sleeve are vulcanized and bonded to the main rubber elastic body, and a window portion is formed in the intermediate sleeve, and a pocket portion that opens to the outer peripheral surface through the window portion is formed in the pocket portion. An integral vulcanized molded product is configured by being provided on the rubber elastic body of the main body. On the other hand, an outer cylindrical member is extrapolated to the integral vulcanized molded product and is fitted and fixed to the intermediate sleeve to cover the opening of the pocket portion. In the fluid-filled cylindrical vibration isolator in which a fluid chamber in which an incompressible fluid is sealed is formed, the intermediate sleeve is configured by a pair of annular divided cylindrical bodies that are spaced apart in the axial direction, Integrated vulcanization molding The pair of annular divided cylinders are fixedly positioned by the outer cylinder member with an axial separation distance smaller than an axial separation distance of the pair of annular divided cylinders in the single body, and the main body A fluid-filled cylindrical vibration isolator in which axial compression is exerted on the rubber elastic body.

  In the fluid-filled cylindrical vibration isolator having such a structure according to this aspect, the pair of annular divided cylindrical bodies is separated from the separation distance in the axial direction of both annular divided cylindrical bodies in a single unit of the integrally vulcanized molded product. Since the outer cylinder member is fixedly positioned with a small axial separation distance, it is relatively displaced in the axial direction, and this approach displacement state is assembled to the integrally vulcanized molded product. It is to be held by being. Accordingly, the main rubber elastic body is compressed and deformed in the axial direction, and the main rubber elastic body accompanying the vulcanization molding is transmitted to the entire rubber elastic body based on the elastic deformation of the rubber elastic body and transmission of stress. Thus, the residual stress is reduced or eliminated, and the main rubber elastic body can be pre-compressed.

  That is, in this aspect, the intermediate sleeve is divided into a pair of annular divided cylindrical bodies that are spaced apart in the axial direction, thereby reducing the diameter of the intermediate sleeve that requires a complicated and large drawing die. Without pressing the intermediate sleeve in the axial direction, the pre-compression of the main rubber elastic body attached to the intermediate sleeve is simpler than that in the radial direction. It can be done easily by work. In the fluid-filled cylindrical vibration isolator having the structure according to this aspect in which the pair of annular divided cylindrical bodies constituting the intermediate sleeve are relatively displaced in the axial direction and fixedly positioned as described above. Since effective pre-compression is exerted on the main rubber elastic body and the residual tensile stress accompanying vulcanization molding is reduced or eliminated, good durability can be exhibited.

  In addition, the intermediate sleeve is not greatly deformed in the direction of diameter reduction, and deformation of the intermediate sleeve itself is avoided as much as possible. Therefore, in the fluid-filled cylindrical vibration isolator as a finished product, The shape and dimensions of the intermediate sleeve can be stabilized. As a result, the fluid tightness between the intermediate sleeve and the outer cylinder member is achieved highly and stably, and the vibration-proof performance and reliability of the product can be stabilized.

  In addition, in the cylindrical vibration isolator of this aspect, the pair of annular divided cylinders are fixedly positioned on the outer cylinder member so that the main rubber elastic body is subjected to axial pre-compression. Therefore, for example, a pair of annular divided cylindrical bodies are displaced toward each other in the axial direction to pre-compress the main rubber elastic body, and at the same time, the pair of annular divided cylindrical bodies are fitted and fixed to the outer cylindrical member. It is also possible to reduce the target fluid-filled cylindrical vibration isolator by simultaneously performing the step of relatively moving the annular divided cylinder and the step of fitting and fixing the outer cylinder member at the same time. It is also possible to manufacture easily with the number of manufacturing steps.

(Aspect 2 of the present invention relating to a fluid-filled cylindrical vibration isolator)
A feature of aspect 2 of the present invention relating to a fluid-filled cylindrical vibration isolator is that a fluid-filled tubular vibration isolator according to aspect 1 of the present invention is characterized in that the fluid chamber is connected to the inner shaft member. The outer cylinder member is constituted by a plurality of divided fluid chambers that are spaced apart from each other in the circumferential direction between the opposed surfaces in the axis-perpendicular direction and that generate relative pressure fluctuations when vibration is input in the axis-perpendicular direction. Forming a circumferential groove that opens on the outer peripheral surface and extends in the circumferential direction in at least one of the annular divided cylinders, and covers the circumferential groove with the outer cylinder member to thereby form the plurality of divided fluid chambers. That is, the orifice passages communicating with each other are formed.

  In such an aspect, the orifice passage is formed in the annular divided cylindrical body positioned on the outer peripheral side of the inner shaft member, so that the total length of the orifice passage is larger than that formed in the inner shaft member or the like. Can be set large, and the degree of freedom of tuning of the orifice passage can be sufficiently secured. In addition, since it is not necessary to provide another member for forming the orifice passage, the structure is simplified and the manufacture is facilitated. In particular, it is not necessary to employ an orifice member extending in the circumferential direction along the inner circumferential surface of the outer cylinder member as described in, for example, the above-mentioned Patent Document 1, and a sufficiently long orifice passage can be realized. Such an orifice member is also advantageous in that the displacement of the pair of annular divided cylinders in the relative approaching direction is limited, the volume of the fluid chamber and the effective stroke length in the direction perpendicular to the axis are limited. It can be avoided.

  In particular, in the present aspect, the shape is complicated by forming the circumferential groove, and the annular divided cylindrical body in which the strength difference is generated due to the partial difference in the thickness dimension, If the drawing is performed, irregular deformation may be caused. However, when the drawing is applied in combination with the first aspect of the present invention, the configuration in which the main rubber elastic body is pre-compressed is separated in the axial direction. This is realized by relatively moving the pair of arranged annular divided cylinders relatively close to each other in the axial direction. Therefore, when the main rubber elastic body is compressed and deformed, irregular deformation of the annular divided cylinder is advantageous. To be prevented. Therefore, the shape of the orifice passage can be secured with excellent accuracy, and the sealing performance can be secured stably and advantageously.

(Aspect 3 of the present invention relating to a fluid-filled cylindrical vibration isolator)
A feature of the aspect 3 of the present invention relating to the fluid-filled cylindrical vibration isolator is that the fluid-filled tubular vibration-damping apparatus according to the first or second aspect of the present invention is the above-described integral vulcanized molded product. In the both end surfaces in the axial direction of the main rubber elastic body, there is formed an annular hollow recess extending continuously in the circumferential direction along the inner shaft member.

  In this embodiment, the spring rigidity in the twisting direction can be reduced, so that tuning of the spring characteristics according to demand can be realized advantageously. In particular, in the cylindrical vibration isolator according to any one of aspects 1 to 3 of the present invention as described above, the outer peripheral portion of the main rubber elastic body is obtained by relatively displacing the pair of annular divided cylindrical bodies in the axial direction. It should be considered that the precompression applied directly to the inner peripheral portion is efficiently transmitted to the inner peripheral portion, and effective precompression is applied to a wide portion of the main rubber elastic body. Here, according to the third aspect of the present invention, the annular length of the hollow portion is formed in the circumferential direction along the inner shaft member, so that the axial length of the inner peripheral portion of the main rubber elastic body is The length in the axial direction of the outer peripheral portion of the rubber elastic body is made smaller, and the axial deformation and compressive stress exerted on the outer peripheral portion of the main rubber elastic body are directed from the outer peripheral portion to the inner peripheral portion of the main rubber elastic body. Therefore, the desired pre-compression can be more effectively exerted on the entire main rubber elastic body.

  In particular, in this aspect, the outer circumferential surface of the inner shaft member is formed on the both end surfaces in the axial direction of the main rubber elastic body by forming annular recesses continuously extending in the circumferential direction along the inner shaft member. The surface is substantially configured to include the wall portion of the hollow portion, and the hollow portion is deepest on the outer peripheral surface of the inner shaft member, and the depth dimension gradually decreases toward the outer peripheral side. It has a cross-sectional shape. That is, the axial length of the main rubber elastic body is gradually increased from the inner peripheral portion to the outer peripheral portion, whereby the compressive deformation exerted in the axial direction on the outer peripheral portion of the main rubber elastic body is reduced. It is effectively exerted on the inner peripheral portion of the body while suppressing the generation of tensile stress at both end portions in the axial direction, and the pre-compression of the entire main rubber elastic body is more effectively exhibited.

(Aspect of the present invention relating to a method of manufacturing a fluid-filled cylindrical vibration isolator)
A feature of the aspect of the present invention relating to the manufacturing method of the fluid-filled cylindrical vibration isolator is that (a) the pair of annular divided cylindrical bodies are separated from each other in the axial direction, separated from the outer peripheral side of the inner shaft member. A window formed between the opposed surfaces in the axial direction of the pair of annular divided cylinders by placing the rubber elastic body of the main body between the inner shaft member and the pair of annular divided cylinders. A step of forming an integrally vulcanized molded product in which a pocket portion that opens to the outer peripheral surface through the portion is provided on the main rubber elastic body; and (b) exerting an external force on the integrally vulcanized molded product, A step of pre-axially compressing the main rubber elastic body by displacing the divided cylindrical bodies by a predetermined distance in a direction approaching each other in the axial direction; and (c) separately from the integrally vulcanized molded product. The outer cylindrical member formed on and inserted into the pair of annular divisions By fitting and fixing to the body, the inner shaft member and the outer cylinder member are elastically connected by the main rubber elastic body, and the pocket portion is covered fluid-tightly and incompressible fluid is enclosed. A fluid-filled cylindrical vibration isolator including a step of forming a fixed fluid chamber and fixing and holding the pair of annular divided cylindrical bodies in a state of being displaced in a relatively approaching direction in the axial direction. It is in the manufacturing method of an apparatus.

  According to such a method of the present invention, the fluid-filled cylindrical vibration isolator according to any one of the first to third aspects of the present invention can be advantageously realized. In this embodiment, the order of the steps (a), (b), and (c) described above is not limited at all. Specifically, for example, after completing the step of forming the integrally vulcanized molded product of (a), the step of applying axial pre-compression to the main rubber elastic body of (b) is completed, and then (c The step of fixedly positioning and holding the pair of annular divided cylindrical bodies may be completed. Alternatively, after the step (a) is completed, the step (b) and the step (c) may be completed at the same time by using, for example, one drawing die as exemplified in the embodiment of the present invention. good.

  As is clear from the above description, in the fluid-filled cylindrical vibration isolator having the structure according to the present invention, the pair of annular divided cylinders spaced apart in the axial direction is relatively displaced in the axial direction. It is set as the structure where the axial pre-compression is exerted with respect to the main body rubber elastic body by being assembled and assembled. Therefore, effective pre-compression can be exerted on the main rubber elastic body while avoiding deformation of the intermediate sleeve itself, and the sealing performance between the intermediate sleeve and the outer cylinder member can be stably secured. However, excellent durability can be easily obtained.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIGS. 1 and 2 show an anti-vibration bush 10 used for an automobile suspension bush or the like as an embodiment of the present invention. The anti-vibration bushing 10 includes an inner cylinder member 12 as an inner shaft member and an outer cylinder member 14 as an outer cylinder member arranged at a predetermined distance in the radial direction and interposed therebetween. The main rubber elastic bodies 16 are connected to each other. The anti-vibration bushing 10 is interposed between the anti-vibration-coupled members by attaching the anti-vibration bush 10 to each of the anti-vibration-coupled members of the inner cylinder fitting 12 and the outer cylinder fitting 14. Yes.

  More specifically, the inner cylinder fitting 12 has a small-diameter, generally cylindrical shape. Further, large-diameter annular collar portions are integrally formed at both end portions in the axial direction of the inner cylindrical fitting 12 so as to protrude from the outer peripheral surface. Further, a metal sleeve 18 serving as an intermediate sleeve is disposed on the outer side in the radial direction of the inner cylindrical metal member 12 at a predetermined distance.

  The metal sleeve 18 includes a first ring fitting 20 and a second ring fitting 22 as a pair of annular divided cylindrical bodies. The first and second ring fittings 20 and 22 have a large-diameter substantially annular shape. The outer diameter of the first ring fitting 20 and the outer diameter of the second ring fitting 22 are substantially the same, while the inner diameter of the first ring fitting 20 is larger than the inner diameter of the second ring fitting 22. Has also been enlarged. That is, the thickness dimension of the second ring fitting 22 is made larger than that of the first ring fitting 20. Moreover, although the formation material of the 1st ring metal fitting 20 and the 2nd ring metal fitting 22 is not specifically limited, In this embodiment, while the 1st ring metal fitting 20 is formed with metal materials, such as iron, The second ring fitting 22 is formed of a metal material such as an aluminum alloy.

  Further, as shown in FIG. 3 in an enlarged manner, the second ring metal fitting 22 is provided with a circumferential groove 24 as a circumferential groove. The circumferential groove 24 extends continuously in the circumferential direction of the second ring metal fitting 22 with a length of substantially less than one round, and is formed to open on the outer peripheral surface of the second ring metal fitting 22. Further, both end portions in the circumferential direction of the circumferential groove 24 are opened in the axial direction through one of the communication holes 26 formed to open on one axial surface of the second ring fitting 22. .

Further, the first ring metal fitting 20 and the second ring metal fitting 22 are extrapolated to the inner cylinder metal fitting 12 and spaced apart from the inner cylinder metal fitting 12 by a predetermined distance in the radial direction. The first ring fitting 20 and the second ring fitting 22 are positioned and arranged on substantially the same central axis. In particular, in the present embodiment, the first ring metal fitting 20 and the second ring metal fitting 22 are spaced apart from each other with a predetermined separation distance L ₁ in the axial direction in a state where the first ring metal fitting 20 and the second ring metal fitting 22 are fitted on the inner cylinder fitting 12. (See FIG. 4). Thereby, the first ring metal fitting 20 and the second ring metal fitting 22 are positioned and arranged near both ends in the axial direction of the inner cylinder metal fitting 12.

  Moreover, between the axial direction opposing surfaces of the 1st ring metal fitting 20 and the 2nd ring metal fitting 22, the window part 28 is formed with the annular shape extended over the whole circumferential direction.

A main rubber elastic body 16 is interposed between the metal sleeve 18 composed of the first and second ring fittings 20 and 22 and the radially opposing surfaces of the inner cylinder fitting 12. The inner peripheral surface of the main rubber elastic body 16 is vulcanized and bonded to the outer peripheral surface of the inner cylindrical metal member 12, and the outer peripheral surface of the main rubber elastic member 16 is connected to the inner peripheral surface of the first ring metal member 20 and the second ring. The inner peripheral surface of the metal fitting 22 is vulcanized and bonded. Thereby, the main rubber elastic body 16 is formed as an integrally vulcanized molded product 30 including the inner cylinder fitting 12 and the first and second ring fittings 20 and 22. Note that, in such a single unit of the integrally vulcanized molded product 30, the first ring metal fitting 20 and the second ring metal fitting 22 are naturally axially connected to each other due to heat shrinkage associated with the vulcanization molding of the main rubber elastic body 16. It will be displaced in the approaching direction. Than Te, the predetermined distance in the axial direction between the first metal ring 20 in the second metal ring 22: L ₁ is, both at the time of positioning arranged both metal ring 20, 22 in a predetermined mold before vulcanization A predetermined length is shorter than a predetermined separation distance (not shown) in the axial direction of the ring fittings 20 and 22.

  And the outer peripheral surface of the axial direction intermediate part except the outer peripheral surface of the axial direction both ends in the main rubber elastic body 16 vulcanized and bonded to the first and second ring metal parts 20 and 22 is the first and second ring metal parts 20 and 22. The outer peripheral surfaces 22 are substantially flush with the entire circumference in the circumferential direction, and are exposed from the window portion 28. In other words, the main rubber elastic body 16 is filled in the window portion 28. For reasons such as handling during molding of the integrally vulcanized molded product 30, the inner peripheral surface of the main rubber elastic body 16 is vulcanized and bonded to the outer peripheral surface of the intermediate portion in the axial direction of the inner cylindrical metal member 12. The cylindrical fitting 12 is substantially flush with the outer peripheral surfaces at both axial ends, and is not vulcanized and bonded to the outer peripheral surfaces at both axial ends.

  Further, the main rubber elastic body 16 is provided with a pair of pocket portions 32, 32 so as to be opposed to each other in one radial direction (left and right in FIG. 2) sandwiching the inner cylinder fitting 12. These pocket portions 32, 32 have a bottom portion that reaches substantially the inner cylindrical metal fitting 12, and in the region of a little less than a half circumference of the main rubber elastic body 16, the axial directions of the first ring metal fitting 20 and the second ring metal fitting 22, respectively. Through the window 28 formed between the opposing surfaces, a recess is opened in the outer peripheral surface of the main rubber elastic body 16.

  Furthermore, a stopper block 34 having a substantially rectangular flat plate shape is fixed to an intermediate portion in the axial direction of the inner cylindrical metal member 12, and both end portions thereof protrude from the bottom wall portion of each pocket portion 32 with a predetermined length. It is positioned. Thus, as described later, when a large vibration is input in the direction perpendicular to the axis in a state where the outer cylinder fitting 14 is assembled to the integrally vulcanized molded product 30, the inner cylinder fitting 12 is inserted into the outer cylinder via the stopper block 34. It comes into contact with the metal fitting 14. That is, the stopper block 34 is provided with a stopper function that reduces or prevents excessive displacement between the inner cylinder fitting 12 and the outer cylinder fitting 14. A thin rubber layer integrally formed with the main rubber elastic body 16 is attached to the entire outer peripheral surface of the stopper block 34.

  Further, the main rubber elastic body 16 of the integrally vulcanized molded product 30 has a meat extending from the both end surfaces in the axial direction inward in the axial direction and extending continuously in the circumferential direction along the inner cylindrical fitting 12. A cutout portion 36 is formed as a recess. The thinned portion 36 has an inversely tapered surface shape that gradually increases in diameter in a substantially conical shape from the inner side to the outer side in the axial direction. As a result, the spring stiffness in the twisting direction of the main rubber elastic body 16 is adjusted.

  Furthermore, the outer cylinder fitting 14 is extrapolated to such an integrally vulcanized molded product 30. The outer cylinder fitting 14 has a large-diameter, generally cylindrical shape, and a thin seal rubber layer 42 is adhered to the entire inner peripheral surface thereof. Then, the outer cylinder fitting 14 is drawn, and both end portions in the axial direction of the outer cylinder fitting 14 are bent inward in the radial direction, and each of the first and second ring fittings 20 and 22 is respectively It is fitted and fixed. Thereby, the first ring metal fitting 20 and the second ring metal fitting 22 are fixedly positioned and fixed by the outer cylinder metal fitting 14, and the outer cylinder metal fitting 14 is fitted and fixed to the integral vulcanization molded product 30. . Further, the main rubber elastic body 16 filled in the window portion 28 formed between the axially opposed surfaces of the first ring fitting 20 and the second ring fitting 22 is substantially attached to the outer tube fitting 14 via the seal rubber layer 42. Are in close contact with each other.

In particular, in the present embodiment, the first ring metal fitting 20 and the second ring metal fitting 22 are shafts in a single piece of the integrated vulcanized molded product 30 in a state where the outer cylindrical metal fitting 14 is fitted and fixed to the integral vulcanized molded product 30. predetermined distance in the direction: L ₁ small axial distance than: with L ₂ are brought relatively closer position in the axial direction (see FIG. 6.). Thereby, the main rubber elastic body 16 is compressed and deformed in a direction (up and down in FIGS. 1 and 6) in which the first and second ring fittings 20 and 22 are relatively displaced. That is, the outer peripheral portion of the main rubber elastic body 16 is compressed and deformed in the axial direction, and the compressive stress is transmitted from the outer peripheral portion to the inner peripheral portion of the main rubber elastic body 16 so that the pre-compression effective for the whole is effective. Has been applied. Thereby, the axial pre-compression is exerted on the main rubber elastic body 16 according to the present embodiment. At the same time, the main rubber elastic body 16 filled in the window portion 28 is bulged and deformed so as to rise from the window portion 28 to the outer peripheral surface, and the surface of the main rubber elastic body 16 with respect to the outer cylindrical metal fitting 14. A large pressure is secured.

  Thereby, the circumferential groove 24 formed in the window part 28 formed in the axial direction opposing surface of the 1st ring metal fitting 20 and the 2nd ring metal fitting 22, and the 2nd ring metal fitting 22, is the outer cylinder metal fitting 14, respectively. Fluid tightly covered. Further, the pair of pocket portions 32 and 32 are sealed with respect to the external space, and a pressure receiving chamber 38 as a divided fluid chamber in which an incompressible fluid is sealed is formed in each pocket portion 32. . That is, in the present embodiment, the fluid chambers in which relative pressure fluctuations are generated between the inner cylinder fitting 12 and the outer cylinder fitting 14 in the direction perpendicular to the axis when the vibration is applied in the direction perpendicular to the axis are separated from each other in the circumferential direction. It is configured to include a pair of pressure receiving chambers 38, 38 positioned. Further, since the circumferential groove 24 is sealed with respect to the external space, the circumferential groove 24 and the outer cylinder fitting 14 cooperate to extend the orifice passage 40 with a length of substantially less than one round in the circumferential direction of the second ring fitting 22. Is forming. The orifice passage 40 is configured to change the setting of the ratio of the passage cross-sectional area: A and the passage length: L: A / L based on the required vibration-proofing effect. Further, both end portions in the circumferential direction of the orifice passage 40 are communicated with the pressure receiving chambers 38 through one of the communication holes 26 and 26 formed in the second ring metal fitting 22, respectively. , 38 are in communication with each other through the orifice passage 40. Accordingly, when a vibration in a specific frequency range in the direction perpendicular to the axis is input, the fluid between one pressure receiving chamber 38 and the other pressure receiving chamber 38 through the orifice passage 40 based on the resonance action of the fluid flowing through the orifice passage 40 and the like. The flow is generated, and the vibration isolation effect based on the flow action of the fluid flowing through the orifice passage 40 is exhibited.

  As the sealing fluid, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is adopted. In particular, in order to obtain a vibration isolation effect based on the resonance action of the fluid, the viscosity is a low viscosity of 0.1 Pa · s or less. A fluid is advantageously employed. Furthermore, the fluid is sealed by, for example, assembling the outer tube fitting 14 to the integrally vulcanized molded product 30 in the fluid.

  Next, a specific example of the manufacturing method of the vibration isolating bushing 10 having the above-described structure will be described with reference to FIGS. 4 to 6 and the like, but the present embodiment is not limited to such a specific example. .

First, the inner cylinder fitting 12, the first ring fitting 20, and the second ring fitting 22 in which the stopper block 34 is assembled in a predetermined mold (not shown) are accommodated, respectively, and the first ring fitting 20 and the second ring fitting are accommodated. 22 are spaced apart from each other by a predetermined distance radially outward of the inner cylindrical metal member 12 and are spaced apart from each other with a predetermined separation distance in the axial direction. Thereby, the window part 28 is formed between the axial direction opposing surfaces of the 1st ring metal fitting 20 and the 2nd ring metal fitting 22 so that it may extend over the perimeter of the circumferential direction. Further, the main rubber elastic body 16 is vulcanized between the radially opposing surfaces of the inner cylinder fitting 12 and the first and second ring fittings 20 and 22 to obtain an integrally vulcanized molded product 30. Further, during the vulcanization molding of the main rubber elastic body 16, a pair of pocket portions 32, 32 are formed on the outer peripheral surface of the main rubber elastic body 16 so as to be opposed to each other in one radial direction with the inner cylinder fitting 12 interposed therebetween. An opening is formed in the outer peripheral surface through the window portion 28. The first ring metal fitting 20 and the second ring metal fitting 22 naturally approach each other in the axial direction in accordance with the heat shrinkage or the like applied to the rubber elastic body 16 after the vulcanization molding of the main rubber elastic body 16. Displaced and spaced apart with a predetermined separation distance L ₁ in the axial direction.

  In addition, the outer tubular metal fitting 14 having the sealing rubber layer 42 attached to the inner peripheral surface is formed separately from the integrally vulcanized molded product 30. Further, one end (downward in FIG. 4) in the axial direction of the outer cylinder fitting 14 is bent radially inward by a predetermined length.

  Further, in the incompressible fluid, the outer cylinder fitting 14 and the integrally vulcanized molded product 30 are set in a drawing die 44 as shown in FIGS.

  Here, the drawing die employed in the manufacture of the vibration isolating bushing 10 according to the present embodiment is not limited in any way, and various conventionally known drawing die can be employed. The description of the aperture die 44 to be performed will be simplified.

  The drawing die 44 includes an upper die 46, a lower die 48, a first middle die 50, and a second middle die 52. The upper die 46 has a thick, substantially cylindrical shape, and its central hole gradually increases in a conical shape from the upper axial direction (upward in FIG. 4) to the lower axial direction (lower in FIG. 4). An inversely tapered surface 54 having a larger diameter is provided. Further, a stepped portion 56 that protrudes inward in the radial direction with a predetermined length is formed on the upper edge of the central hole in the upper mold 46 so as to extend continuously or discontinuously in the circumferential direction. Further, the lower die 48 has a large-diameter substantially disk shape, and a holding recess 58 having a substantially circular shape in a plan view is formed in the center portion so as to open upward in the axial direction. .

  Further, the first middle mold 50 has a substantially inverted bottomed cylindrical shape, the outer diameter of the upper base is slightly smaller than the inner diameter of the stepped portion 56 of the upper mold 46, and the lower end. The outer diameter dimension of the cylindrical wall portion is set to be substantially the same as the outer diameter dimension of the first ring fitting 20 and the second ring fitting 22 in the integrally vulcanized molded product 30. In addition, an annular stepped portion 60 protrudes radially outward from the axially intermediate portion of the first middle mold 50. Further, on the outer peripheral surface of the step portion 60 in the first middle mold 50, the diameter dimension gradually decreases conically from the lower side in the axial direction (lower side in FIG. 4) to the upper side in the axial direction (upper side in FIG. 4). A tapered surface 62 is formed. Further, the magnitude of the gradient in the tapered surface 62 from the lower side in the axial direction to the upper side is substantially the same as the magnitude of the gradient in the reverse tapered surface 54 of the upper mold 46 from the lower side in the axial direction. Further, a support rod 64 protrudes downward in the axial direction at the center of the bottom wall portion of the first middle mold 50. The support rod 64 has a substantially cylindrical shape with a small diameter, and the outer diameter dimension thereof is slightly smaller than the inner diameter dimension of the inner cylinder fitting 12 in the integrally vulcanized molded product 30.

  Furthermore, the second middle mold 52 has a substantially cylindrical shape and is composed of twelve strip molds 66 equally divided in the circumferential direction. These twelve strip molds 66 are placed on the lower mold 48 so as to surround the holding recesses 58 of the lower mold 48, and each strip mold 66 is a central portion of the lower mold 48 (holding recesses 58). It is supported so as to be displaceable in the radial direction approaching / separating from. Although not explicitly shown in the drawing, the lower die 48 is provided with a groove portion, a drive arm, and the like for moving and guiding each strip die 66 in the radial direction as necessary.

  Further, on the outer peripheral surface of the second middle mold 52, in other words, on the outer peripheral surface of each of the strip molds 66, a cone is formed from the lower side in the axial direction (lower in FIG. 4) to the upper side in the axial direction (upward in FIG. 4). A tapered surface 68 having a gradually decreasing diameter is formed from the upper end in the axial direction of the second middle mold 52 to the middle portion. Further, the magnitude of the gradient of the tapered surface 68 from the lower side to the upper side in the axial direction is substantially the same as that of the reverse tapered surface 54 of the upper mold 46. Further, a caulking piece 70 projects from the upper end portion of the center hole of the second middle die 52, in other words, the upper end portion of the inner peripheral surface of each strip die 66 over the entire length in the circumferential direction. The caulking piece 70 has a substantially triangular cross-sectional shape, and an inner peripheral surface thereof has a tapered shape whose diameter is gradually reduced in a conical shape from the lower side in the axial direction to the upper side.

  Thus, the drawing die 44 having such a structure is installed in an incompressible fluid, and the outer cylinder fitting 14 and the integral vulcanized molded product 30 are set in the drawing die 44 as described above.

  When setting the outer cylinder fitting 14 and the integrally vulcanized molded product 30 to the drawing die 44, first, the outer cylinder fitting 14 is extrapolated to the integral vulcanized molded article 30, and the first ring fitting 20 and the second ring fitting are inserted. The main rubber elastic body 16 filled in the window portion 28 formed between the axially opposed surfaces 22 is substantially directly attached to the outer cylinder fitting 14 via the seal rubber layer 42 attached to the outer cylinder fitting 14. The second ring metal fitting 22 in the integrally vulcanized molded product 30 is placed and held on the end of the outer cylinder metal fitting 14 bent inward in the radial direction. Then, the outer cylinder fitting 14 holding the integral vulcanization molded product 30 is inserted into the second middle mold 52 and the outer cylinder fitting 14 is placed on the lower mold 48, and the inner cylinder fitting in the integral vulcanization molded product 30. The lower end portion of 12 is fitted into the holding recess 58 of the lower mold 48 and supported.

  Further, the first middle die 50 is guided from above the integral vulcanized molded product 30 toward the integral vulcanized molded product 30, and the support rod 64 provided on the first middle die 50 is connected to the inner vulcanized molded product 30. While inserting in the cylindrical metal fitting 12, the lower end part is made to contact | abut to the upper end part of the 1st ring metal fitting 20 in the integral vulcanization molded product 30. FIG. Further, the upper mold 48 is guided from above the first middle mold 50 to the first middle mold 50, and a reverse tapered surface 54 formed on the inner peripheral surface of the upper mold 48 is formed on the first middle mold 50. The tapered surface 62 and the tapered surface 68 formed on the second middle mold 52 (each strip mold 66) are brought into contact with each other. The upper die 46 is driven and displaced from the upper side to the lower side in the axial direction by using a driving device (not shown) so as to contact the portion 60.

Accordingly, as shown in FIG. 6, the step portion 56 of the upper mold 46 and the step portion 60 of the first middle mold 50 are in contact with each other, and the upper mold 46 changes from the upper side in the axial direction to the lower mold 48. By displacing the drive until it abuts, the first middle die 50 is displaced downward in the axial direction, and an axial pressure is exerted on the integrally vulcanized molded product 30. As a result, the first ring until the predetermined separation distance L _{1 in} the axial direction of the first ring fitting 20 and the second ring fitting 22 in the single unit of the integrally vulcanized molded product 30 becomes the predetermined separation distance L _2. The metal fitting 20 and the second ring metal fitting 22 are relatively displaced in the axial direction, and the main rubber elastic body 16 is relatively displaced along the displacement in the direction in which the first and second ring metal fittings 20 and 22 are relatively displaced ( In FIG. 6, compression deformation occurs in the vertical direction. That is, an axial compressive stress is applied to the outer peripheral portion of the main rubber elastic body 16 and is transmitted from the outer peripheral portion of the main rubber elastic body 16 toward the inner peripheral portion. Thus, the main rubber elastic body 16 is pre-compressed in the axial direction. At the same time, the main rubber elastic body 16 filled in the window portion 28 bulges and deforms so as to rise from the window portion 28 onto the outer peripheral surface. A large pressure is secured.

  The upper vulcanization molded product 30 is pre-compressed in the axial direction, and the upper mold 46 is caused by a taper action when the reverse tapered surface 54 of the upper mold 46 and the tapered surface 68 of the second middle mold 52 come into contact with each other. The 12 strip molds 66 constituting the second middle mold 52 are displaced from the outer side in the radial direction toward the inner side in accordance with the drive displacement from the upper side in the axial direction until it contacts the lower mold 48. As a result, the outer cylinder fitting 14 is subjected to a twelve-way diameter reduction process, and the caulking piece 70 is brought into contact with the upper end portion in the axial direction of the outer cylinder fitting 14 to perform the caulking process. Thus, the main rubber elastic body 16 is pre-compressed in the radial direction, and as described above, the first and second ring fittings 20 and 22 are applied in a state where the main rubber elastic body 16 is pre-compressed in the axial direction. Is positioned and fixed to the outer cylinder fitting 14, and the upper end portion in the axial direction of the outer cylinder fitting 14 is caulked to cover the upper end portion in a fluid-tight manner. As a result, a pair of pressure receiving chambers 38, 38 in which an incompressible fluid is sealed is formed by covering the pair of pocket portions 32, 32 fluid tightly.

  In the present embodiment, the relationship between the axial compressive force and the radial compressive force exerted on the integrally vulcanized molded product 30, the spring characteristics and the shape of the seal rubber layer 42 and the main rubber elastic body 16, etc. Based on the difference and the like, the sealing rubber layer 42 attached to the outer tube fitting 14 is expanded so as to enter the main rubber elastic body 16 side from the window portion 28 of the integrally vulcanized molded product 30 under the assembled state as described above. Deformed.

Thus, in this embodiment, integrally exerts an external force on the vulcanization molded component 30, the direction a predetermined distance to approach the first metal ring 20 and the second metal ring 22 to each other in the axial direction: a predetermined from L ₁ Distance: By displacing until L ₂ , the step of pre-compressing the main rubber elastic body 16 in the axial direction, and fitting the outer cylinder fitting 14 to the first ring fitting 20 and the second ring fitting 22 are fixed. By doing so, the inner cylinder fitting 12 and the outer cylinder fitting 14 are elastically connected by the main rubber elastic body 16, and the pocket portion 32 is covered fluid-tightly and a pair of fluid chambers 38 filled with an incompressible fluid are sealed. , 38, and the step of fixing and holding the first ring metal fitting 20 and the second ring metal fitting 22 in a state in which the first ring metal fitting 20 and the second ring metal fitting 22 are displaced in a relatively approaching direction in the axial direction. Complete at the same time The Thus, by releasing the molded product from the drawing die 44, the vibration isolating bush 10 of the present embodiment is realized.

  In the vibration isolating bushing 10 having the above-described structure, the metal sleeve 18 includes the first ring fitting 20 and the second ring fitting 22 that are spaced apart from each other in the axial direction. By causing the second ring metal fittings 20 and 22 to move relatively close to each other in the axial direction, the main rubber elastic body 16 is pre-compressed in the axial direction, so that the metal sleeve 18 is easily and stable in the axial direction. As a result, the main rubber elastic body 16 can be easily and stably compressed and deformed. Therefore, irregular deformation during the compression deformation of the metal sleeve 18 is prevented, and pre-compression is effectively applied to the main rubber elastic body 16, thereby ensuring the sealing performance between the metal sleeve 18 and the outer tube fitting 14. The durability performance of the main rubber elastic body 16 is improved to a high degree.

  Further, in the present embodiment, the thinned portion 36 is formed so as to continuously extend in the circumferential direction along the inner cylinder fitting 12 at each axial end surface of the main rubber elastic body 16, thereby The compressive stress exerted on the outer peripheral portion of the main rubber elastic body 16 as the two ring metal fittings 20 and 22 are relatively displaced in the axial direction is increased from the outer peripheral portion of the main rubber elastic body 16 toward the inner peripheral portion. As a result, the main rubber elastic body 16 can be pre-compressed more effectively.

  Further, in the present embodiment, when the outer cylinder fitting 14 is assembled to the integrally vulcanized molded product 30, the outer peripheral surface of the main rubber elastic body 16 filled in the window 28 is substantially directly attached to the outer cylinder fitting 14. When the main rubber elastic body 16 is compressed and deformed in the axial direction when the main rubber elastic body 16 is subjected to axial pre-compression, the window portion is provided. In this case, the rubber elastic body 16 is swelled and deformed so as to rise on the outer peripheral surface, so that a large surface pressure of the rubber elastic body 16 with respect to the outer cylinder fitting 14 can be secured. Therefore, the main rubber elastic body 16 and the outer cylinder fitting 14 are held in close contact with each other, and the short circuit between the pair of pressure receiving chambers 38 and 38 is stably prevented, so that the vibration isolation effect is stably exhibited. To get.

  In the present embodiment, since the thickness dimension of the second ring metal fitting 22 is larger than the thickness dimension of the first ring metal fitting 20, the design freedom of the circumferential groove 24 in the second ring metal fitting 22 is large. Therefore, the degree of freedom of tuning of the orifice passage 40 can be advantageously ensured. In addition, since the thickness dimension of the first ring fitting 20 where the orifice passage 40 is not provided is reduced, the rubber volume of the main rubber elastic body 16 vulcanized and molded in the ring fitting 20 and the direction perpendicular to the axis. An effective free length can be ensured efficiently, and weight reduction can also be achieved advantageously.

  Furthermore, according to the method for manufacturing the vibration isolating bush 10 according to the present embodiment, the main rubber elastic body 16 can be pre-compressed in the axial direction, and the outer cylinder fitting 14 can be assembled to the integrally vulcanized molded product 30. Further, the outer cylindrical metal member 14 can be subjected to a drawing process so that the main rubber elastic body 16 can be pre-compressed in the radial direction. Therefore, the residual elastic stress of the rubber elastic body 16 can be advantageously eliminated, and the durability can be further improved. In addition, the plurality of processes can be realized simultaneously by using one drawing die 44. As a result, work efficiency can be dramatically improved.

  As mentioned above, although one embodiment of the present invention has been described in detail, this is merely an example, and the present invention is not limited to any specific description by this embodiment, and is based on the knowledge of those skilled in the art. The present invention can be implemented with various changes, modifications, improvements, etc., and all such embodiments are within the scope of the present invention without departing from the spirit of the present invention. Needless to say, there is.

  For example, in the above-described embodiment, the outer cylinder fitting is subjected to a drawing process so that the main rubber elastic body is subjected to radial pre-compression. However, the drawing process is performed as necessary. Is not required work.

  Moreover, in the said embodiment, it is not limited to the manufacturing method of an anti-vibration bush as illustrated, a drawing type | mold, etc. For example, in an incompressible fluid, the outer cylinder fitting is inserted into the integrally vulcanized molded product, and the axially opposite end portions of the outer cylinder fitting are caulked to hold the integral vulcanized molded product on the outer cylinder fitting. In addition, in the incompressible fluid or in the air, by applying an axial pressure to the integral vulcanized product assembled with such an outer cylinder fitting, axial pre-compression is applied to the main rubber elastic body to prevent it. A vibration bush may be realized.

  Moreover, in the said embodiment, although the orifice channel | path was formed by providing a circumferential groove in the 2nd ring metal fitting, it replaces with or adds to a 2nd ring metal fitting, and provides a circumferential groove in the 1st ring metal fitting. The position and number of orifice passages may be set and changed as appropriate.

  In the above-described embodiment, the orifice passage is formed in the second ring fitting with a length of slightly less than one turn in the circumferential direction. May be.

  In the above-described embodiment, the orifice member for forming the orifice passage is not provided in the pressure receiving chamber. However, the orifice member may be provided in the pressure receiving chamber depending on the required vibration isolating performance or the like. .

  In addition, in the above-described embodiment, a specific example in which the present invention is applied to a vibration isolating bush that exhibits a vibration isolating effect based on a fluid action such as a resonance action of a fluid flowing through an orifice passage is shown. However, the present invention is not limited to this. For example, the vibration-proofing effect is exhibited based on the fluid action such as shearing action of the high-viscosity fluid sealed in the fluid chamber without providing the orifice passage. Of course, the present invention can be applied to various fluid-filled cylindrical vibration-proof devices in addition to the vibration-proof bush.

It is explanatory drawing which shows the anti-vibration bush as one Embodiment of this invention, and is a figure equivalent to the II cross section in FIG. It is a cross-sectional explanatory drawing which shows the anti-vibration bush in FIG. It is a perspective explanatory view which shows the 2nd ring metal fitting which constitutes a part of anti-vibration bush in Drawing 1 as a model. It is longitudinal cross-sectional explanatory drawing which shows typically one form of the manufacturing process as a specific example at the time of manufacturing the anti-vibration bush in FIG. It is VV sectional drawing in FIG. It is longitudinal cross-sectional explanatory drawing which shows another form of the manufacturing process as a specific example at the time of manufacturing the vibration isolating bush in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Anti-vibration bush 12 Inner cylinder metal fitting 14 Outer cylinder metal fitting 16 Main body rubber elastic body 18 Metal sleeve 20 First ring metal fitting 22 Second ring metal fitting 28 Window part 30 Integrated vulcanization molding 32 Pocket part 38 Pressure receiving chamber

Claims (4)

A main rubber elastic body is disposed between the inner shaft member and an intermediate sleeve disposed at a predetermined distance on the outer peripheral side of the inner shaft member, and the inner shaft member and the intermediate sleeve are added to the main rubber elastic body. While forming a window portion in the intermediate sleeve and providing a pocket portion that opens to the outer peripheral surface through the window portion in the main rubber elastic body, an integral vulcanized molded product is formed. An outer cylinder member is extrapolated to the molded product and is fitted and fixed to the intermediate sleeve, thereby covering the opening of the pocket portion and forming a fluid chamber in which an incompressible fluid is enclosed. In the vibration device,
The intermediate sleeve is composed of a pair of annular divided cylinders spaced apart in the axial direction, and is smaller than the separation distance in the axial direction of the pair of annular divided cylinders in the single unit of the integrally vulcanized molded product. The pair of annular divided cylindrical bodies are fixedly positioned by the outer cylindrical member with an axial separation distance, whereby axial compression is exerted on the main rubber elastic body. Fluid-filled cylindrical vibration isolator.   The fluid chambers are spaced apart from each other in the circumferential direction between the surfaces perpendicular to the axis of the inner shaft member and the outer cylinder member, and a plurality of relative pressure fluctuations are caused when vibration is input in the direction perpendicular to the axis. A circumferential fluid groove is formed on the outer circumferential surface of at least one of the pair of annular divided cylinders and extends in the circumferential direction, and the circumferential groove is covered with the outer cylinder member. The fluid-filled cylindrical vibration damping device according to claim 1, wherein an orifice passage that communicates the plurality of divided fluid chambers with each other is formed.   3. An annular hollow recess extending continuously in the circumferential direction along the inner shaft member is formed on both axial end surfaces of the main rubber elastic body in the integrally vulcanized molded product. The fluid-filled cylindrical vibration isolator as described. A pair of annular split cylinders are spaced apart from each other on the outer peripheral side of the inner shaft member, and the main rubber elastic body is vulcanized between the inner shaft member and the pair of annular split cylinders. By molding, an integrally vulcanized molded product is formed in which the main rubber elastic body has a pocket portion that opens to the outer peripheral surface through a window portion formed between the axially opposed surfaces of the pair of annular divided cylindrical bodies. And a process of
By applying an external force to the integrally vulcanized molded product and displacing the pair of annular divided cylindrical bodies by a predetermined distance in a direction approaching each other in the axial direction, axial pre-compression with respect to the main rubber elastic body And a process that exerts
An inner cylinder member and the outer cylinder member that are formed separately from the integrally vulcanized molded product and fitted to the pair of annular divided cylinders are fixed to the pair of annular divided cylinders. The elastic body is elastically connected, and the pocket portion is fluid-tightly covered to form a fluid chamber filled with an incompressible fluid, and the pair of annular divided cylinders are relatively approached in the axial direction. A method of manufacturing a fluid-filled cylindrical vibration isolator, the method including a step of positioning and holding in a fixed manner in a state of being displaced in a direction in which to move.

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