JP5457253B2 - Liquid filled vibration isolator and method for manufacturing liquid filled vibration isolator - Google Patents

Description

  The present invention relates to a so-called differential type liquid-filled vibration isolator that is suitable for use as a cabin mount and the like, and a method for manufacturing a liquid-filled vibration isolator, The present invention proposes a technique for preventing the occurrence of deformation or breakage of the restriction passage that contributes to the communication of the liquid chamber during use or in manufacturing, and for exhibiting a desired vibration damping function for a long period of time.

  The space between the inner cylinder and the outer cylinder arranged on the outer peripheral side of the inner cylinder is divided into two in the axial direction by a partition wall formed by directly fixing an elastic member to a rigid member by vulcanization adhesion or the like. As a vibration isolator formed by providing a restriction passage in the rigid member of the partition wall that connects the two liquid chambers formed by enclosing the incompressible liquid in each space separating the partition walls. For example, there are those described in Patent Documents 1 and 2.

For such a vibration isolator, there has been proposed a device illustrated in a longitudinal sectional view in FIG. 5 that can obtain a relatively long restricted passage under a simple structure.
The vibration isolator 51 shown in FIG. 5 includes an annular rigid member 55 that projects the partition wall 52 from the inner cylinder 53 toward the outer cylinder 54, a circumscribed rigid cylinder member 56 that covers the outer peripheral surface of the annular rigid member 55, and The annular rigid member 55 is constituted by an elastic member 57 that is connected to the outer cylinder side member via the circumscribed rigid cylindrical member 56.

  In manufacturing the vibration isolator 51, in order to form such a partition wall 52, first, as shown in a perspective view in FIG. 6, it extends spirally in the figure on the outer peripheral surface of the annular rigid member 55. The passage groove 55a is formed, and notches 55b and 55c are provided at both upper and lower ends in the figure of the passage groove 55a. Then, as shown in FIG. The outer cylinder side member 56, which is formed by connecting the outer cylinder side member with the elastic member 57 on the outer peripheral side, is fitted through the seal member 58 to be frictionally engaged. The annular rigid member 55 is positioned by the inward flange 56a formed in the portion.

  Then, as shown in FIG. 7 (b), the lower end portion of the circumscribed rigid cylindrical member 56 is folded inward and plastically deformed as shown by the arrows in the drawing to form inward flanges 56b. The annular rigid member 55 is sandwiched and fixed between the inward flanges 56a and 56b to firmly connect the annular rigid member 55 and the circumscribed rigid cylindrical member 56.

  In the vibration isolator 51 having the partition wall 52 formed in this way, the restriction passage 59 is partitioned by a passage groove 55a on the outer peripheral surface of the annular rigid member 55 and a circumscribed rigid cylindrical member 56 that covers the passage groove 55a. The restriction passage 59 is opened to the liquid chambers 60 and 61 by the notch portions 55b and 55c provided at the upper and lower ends of the passage groove 55, respectively.

International Publication No. 2009-100205 Pamphlet JP-A-5-26288

However, when inputting a twisting force in a direction intersecting with the axial direction of the vibration isolator 51, or when the partition wall 52 is configured during manufacture of the vibration isolator 51, both ends of the annular rigid member 55 are circumscribed. Since the force is received from the inward flanges 56 a and 56 b of the rigid cylindrical member 56, in the partition wall 52 described above, adjacent to the notch portions 55 b and 55 c at both ends of the annular rigid member 55, other locations. There is a risk that bending deformation in the direction indicated by the arrow in FIG. 6 may occur at each adjacent location where the rigidity is lower than that, or the adjacent location may be damaged.
As a result, the liquid flow as expected in the restriction passage 59 cannot be realized, and the vibration isolator 51 cannot exhibit a desired vibration damping function.

  The present invention has an object to solve such problems of the prior art, and the object of the present invention is to use the end portion of the annular rigid member during use of the apparatus or during manufacture. A liquid-filled vibration isolator capable of exhibiting a desired vibration damping function for a long period of time by preventing the passage groove of the annular rigid member from being deformed or broken due to the action of the force on the liquid It is in providing the manufacturing method of a vibration apparatus.

A liquid-filled vibration isolator according to the present invention includes an inner cylinder, an outer cylinder disposed on the outer peripheral side of the inner cylinder, and a main body that liquid-tightly connects the inner cylinder and the outer cylinder at two locations separated in the axial direction. A partition wall that bisects the space between the inner cylinder and the outer cylinder in the axial direction between the rubber and the main body rubber, and an incompressible liquid is enclosed in each space separating the partition wall Each liquid chamber and a restriction passage provided in the partition wall to provide communication between the two liquid chambers;
The partition wall is provided with an annular rigid member projecting from the inner cylinder toward the outer cylinder side, and a passage groove formed on the outer peripheral surface of the annular rigid member in a liquid-tight manner, and provided at both end portions in the axial direction. Each inward flange comprises a circumscribed rigid cylindrical member that sandwiches and fixes an annular rigid member, and an elastic member that connects the circumscribed rigid cylindrical member to the outer cylinder,
The restriction passage of the partition wall is constituted by a passage groove formed on the outer peripheral surface of the annular rigid member, and a circumscribed rigid cylindrical member in which the opening of the passage groove is liquid-tightly closed via a seal member. Because
The restriction passage is formed in the annular rigid member and extends in the axial direction and is opened to at least one liquid chamber through a through hole extending to the outer peripheral side.

  Here, the “rigidity” of the “annular rigid member” and “externally rigid cylinder member” is that these members are made of metal materials such as iron, steel, and aluminum, or plastic or other rigid materials that are non-metallic materials. Means.

  Preferably, at least one liquid chamber side end surface of the annular rigid member is provided with one or a plurality of indentations extending in the axial direction on the radially inner side of the restricting passage, and the restricting passage extends from the indentation to the outer peripheral side. The extending radial hole is opened to at least one liquid chamber.

  Preferably, the annular rigid member of the partition wall is frictionally engaged with the outer peripheral surface of the inner cylinder, and the outer peripheral surface of the inner cylinder is a flat surface orthogonal to the central axis of the inner cylinder at the fitting portion of the partition wall. A small diameter is formed through the step, and the portion of the end surface of the annular rigid member on the radially inner side of the recess is brought into contact with the step of the inner cylinder.

In the manufacturing method of the liquid filled type vibration damping device of the present invention, the inner peripheral side portion of the partition wall is formed from the other end side of the inner cylinder made of a rigid material in which one main body rubber is fixed to the outer peripheral surface on one end side. Each of the inner cylinder is formed by sequentially fitting an annular rigid member formed with a passage groove on the outer peripheral surface and a fitting cylinder made of a rigid material connected to the inner peripheral surface of the outer cylinder by another main body rubber. In manufacturing a liquid-filled vibration isolator by frictionally engaging the outer peripheral surface and filling each space separated by the partition wall with an incompressible liquid,
The annular rigid member is preliminarily formed with one or more recesses extending in the axial direction on the radial inner side of the passage groove, and a radial hole extending from the recess toward the outer peripheral side. And
The annular rigid member is frictionally engaged with the inner side of the circumscribed rigid cylindrical member via the seal member, and a radially outer region of the recess formed in the annular rigid member is provided at one end portion of the circumscribed rigid cylindrical member. By positioning it in contact with the inward flange, after that, the other end portion of the circumscribed rigid cylindrical member is folded inward and plastically deformed, and an annular rigid member is sandwiched and fixed inside the circumscribed rigid cylindrical member. To form a partition wall.

  Preferably, the annular rigid member is positioned on the inner side of the circumscribed rigid cylindrical member by frictional engagement via the seal member, and then the other end portion of the circumscribed rigid cylindrical member is connected to the outer peripheral surface of the end of the annular rigid member. The partition wall is formed by plastic deformation to a position that matches the tapered surface formed in step (b).

  According to the liquid-filled vibration isolator of the present invention, the annular rigid member is provided with a through hole that extends in the axial direction and extends to the outer peripheral side and opens to the passage groove instead of the notch portion in the conventional vibration isolator. Since the through hole is used to open the restricting passage to the liquid chamber, the rigidity reduction portion is removed from the axial end of the annular rigid member. The end portion of the annular rigid member, and thus the passage groove, which is caused by the force received from the inward flange of the cylindrical member, can be effectively prevented from being deformed and damaged, and the passage groove on the outer peripheral surface of the annular rigid member When the cover is covered with a member, the end portion can be effectively protected against the input acting in the axial direction of the annular rigid member by the plastic processing applied to the circumscribed rigid cylindrical member. Liquid inside The dynamic as always of as the expected, the vibration isolator can exhibit over a long period of time the desired vibration damping function.

  Here, when the restriction passage is opened to the liquid chamber by the recess extending in the axial direction inside the restriction passage in the radial direction of the annular rigid member and the radial hole extending from the depression to the outer peripheral side, the depression of the annular rigid member is formed. Since there is a rigid region adjacent to the inner cylinder on the inner peripheral side of the ring, when the depression is formed over the entire circumference of the annular rigid member, for example, the depression is formed on the annular rigid member inside and outside in the radial direction. The strength of the annular rigid member against the input that acts when manufacturing or using the device, such as by providing a reinforcing part that partially bridges the inner and outer regions separated from each other As a result, the passage groove formed on the outer peripheral surface of the annular rigid member is deformed, and further, the restriction passage formed by covering the passage groove with the outer rigid cylindrical member is further deformed. More effectively Won, the device can exhibit a vibration damping performance as the expected.

By the way, when manufacturing the vibration isolator, an annular rigid member forming the inner peripheral side portion of the partition wall is fitted from one end side of the inner cylinder made of a rigid material, and this is attached to the outer peripheral surface of the inner cylinder. In this case, in order to facilitate the assembly of the annular rigid member to the inner cylinder, the outer peripheral surface of the inner cylinder is the center of the inner cylinder at the fitting portion of the partition wall. It is preferable that the diameter is reduced through a flat surface-shaped step perpendicular to the axis, and the end surface of the annular rigid member is brought into contact with the step to be positioned.
However, when the conventional vibration isolator is assembled and manufactured in this way, the pressing force required to fit the annular rigid member causes a frictional engagement with the outer peripheral surface of the inner cylinder or a step of the inner cylinder. When they are brought into contact with each other, there is a possibility that deformation or the like occurs in the annular rigid member, and in turn, the passage groove thereof.

  In this case, when the end portion of the annular rigid member on the radially inner side of the recess is brought into contact with the flat surface step provided on the outer circumferential surface of the inner cylinder, the annular rigid member is placed on the outer circumferential surface of the inner cylinder. When frictionally engaged and brought into contact with the step of the inner cylinder, the recess extending in the axial direction from the end surface of the annular rigid member functions to release the force acting on the annular rigid member. Since the transmission to the part adjacent to can be suppressed, the effect of preventing the deformation of the restriction passage is further enhanced.

  Further, according to the manufacturing method of the liquid filled type vibration damping device of the present invention, when the annular rigid member is frictionally engaged with the inner side of the circumscribed rigid cylindrical member, the inward flange of the one end portion of the circumscribed rigid cylindrical member is The outer rigid cylinder member is plastically deformed radially inward by positioning the radially outer portion of the recess provided on the end surface of the annular rigid member in contact with each other, thereby plastically deforming the other end portion of the circumscribed rigid cylinder member. When the annular rigid member is sandwiched and fixed between the inward flange and the plastically deformed portion, the end portion of the circumscribing rigid cylindrical member is provided because sufficiently large rigidity is imparted to the end portion in the axial direction of the annular rigid member. The inward flange, the deformation of the passage groove of the annular rigid portion due to the force exerted on the annular rigid member from the plastically deformed portion, the damage can be effectively prevented, so the vibration isolator capable of exhibiting the expected performance, certainly It is possible to elephants.

  Here, when the annular rigid member is sandwiched between the inward flange and the plastically deformed portion of the circumscribed rigid cylindrical member, the other end portion of the circumscribed rigid cylindrical member is formed on the outer peripheral surface of the end portion of the annular rigid member. When plastic deformation is performed to a position that matches the tapered surface, a force acts on the tapered surface of the annular rigid member in a direction perpendicular to the surface, so that one end portion of the circumscribed rigid cylindrical member of the annular rigid member Even when the depression, the through-hole, etc. are formed only on the side, the occurrence of bending deformation or the like of the annular rigid member to the end portion on the other end portion side of the circumscribed rigid cylindrical member is sufficiently effectively prevented. Can do.

1 is a longitudinal sectional view including a central axis showing an embodiment of a vibration isolator of the present invention. FIG. 2 is an enlarged vertical sectional view of a main part of the vibration isolator shown in FIG. 1. It is a cross-sectional perspective view which illustrates the assembly | attachment process of a partition wall. It is the same longitudinal cross-sectional view as FIG. 1 which shows other embodiment of the vibration isolator of this invention. It is the longitudinal cross-sectional view similar to FIG. 1 which shows the conventional vibration isolator. It is a perspective view of the cyclic | annular rigid member used for the vibration isolator shown in FIG. It is a longitudinal cross-sectional view which shows the assembly | attachment process of the partition wall in the vibration isolator shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
A vibration isolator 1 illustrated in a longitudinal sectional view in FIG. 1 is disposed on the outer peripheral side of an inner cylinder 2 made of a rigid material, an outer cylinder 3 made of a rigid material, and an inner cylinder 2. And between the inner cylinder 2 and the outer cylinder 3 between the annular main body rubbers 4 and 5 and the main body rubbers 4 and 5 which are liquid-tightly connected to each other at two locations separated in the direction of the axis C. The partition wall 6 is divided into two in the direction of the axis C, the liquid chambers 7 and 8 are formed in each of the spaces separating the partition wall 6, and the partition wall 6 is provided. And a restriction passage 9 for providing communication between the two liquid chambers 7 and 8.

Here, the partition wall 6 protrudes from the inner cylinder 2 toward the outer cylinder 3 as shown in a partially enlarged sectional view in FIG. 2, and here, an annular rigid member 10 configured as a separate member from the inner cylinder 2 and The circumscribed rigid cylinder member 11 circumscribing the annular rigid member 10 and the elastic member 12 connecting the circumscribed rigid cylinder member 11 to the outer cylinder side member are configured.
The annular rigid member 10 has a passage groove 13 that is recessed in a rectangular cross-sectional shape inward from the outer peripheral surface thereof, for example, spirally, and this passage groove 13 is connected to the elastic member 12 in the drawing. The restricting passage 9 is defined by covering the liquid tightly with the circumscribed rigid cylindrical member 11 via the integrally formed cylindrical sealing member 14.

Here, in order to open the restricting passage 9 in one liquid chamber 7 positioned on the upper side in the drawing, the radius of the passage groove 13 is shown on the end surface of the annular rigid member 10 on the liquid chamber 7 side as shown in the drawing. One radiating hole which forms a recess 15 extending in the direction of the axis C toward the other liquid chamber 8 and extending over the entire circumference and extending from the recess 15 toward the outer periphery, for example, having a circular cross-sectional shape. 16 is formed.
According to this, as in the conventional vibration isolator, without the presence of a rigidity reduction portion due to providing a notch portion for opening the passage groove in the liquid chamber at the end of the annular rigid member, Since the restricting passage 9 can be opened in the liquid chamber 7, it is possible to sufficiently prevent the deformation or breakage of the restricting passage 9 when inputting the twisting force in the direction intersecting the axis C direction of the vibration isolator 1. Thus, a desired vibration damping function can be exhibited.

  The shape of the recess 15 is not limited to the shape of the entire periphery as in the illustrated embodiment, and may be an arc shape. For example, a recess having a circular cross section may be formed on the end surface of the annular rigid member. One piece can be provided, or a plurality can be provided at intervals in the circumferential direction of the end face of the annular rigid member.

Further, as shown in the figure, the recess 15 and the radiation hole 16 are provided only at the end of the annular rigid member 10 on the one liquid chamber 7 side, and a not-shown cut is provided at the end on the other liquid chamber 8 side. Although the notch portion is formed, such depressions and radiation holes can be formed at both ends of the annular rigid member 10.
When a recess and a radiation hole are formed at each end of the annular rigid member, a notch portion that causes a rigidity-reduced portion at either end of the annular rigid member when the restriction passage is opened to the liquid chamber. Therefore, it is possible to sufficiently prevent the restriction passage from being deformed or damaged.

By the way, in constituting the partition wall 6 of the vibration isolator 1, as shown in FIG. 3 (a), the partition wall 6 is disassembled, and a ring groove 13 is formed on the outer peripheral surface as shown in a sectional perspective view. Each of the rigid member 10 has an axially extending recess 15 extending in the axial direction on the upper end surface in the drawing, and a radial hole 16 extending from the circumferential recess 15 to the outer peripheral side in the drawing. It is formed in advance before fitting inside.
In addition, as shown to a figure, the reinforcement part 10a which makes a part of the cyclic | annular rigid member 10 can be provided in the multiple places of the circumferential direction of the opening part of the perimeter dent 15.

  Next, as shown in FIG. 3B, the annular rigid member 10 is press-fitted inside the circumscribed rigid cylindrical member 11 to be frictionally engaged through the seal member 14, and the recess formed in the annular rigid member 10. The radially outer region 10b is positioned in contact with an inward flange 11a provided at an end portion on the upper side of the circumscribed rigid cylinder member 11 in the drawing, and thereafter, the diagram of the outer rigid cylinder member 11 is shown. Then, the lower end portion is folded inward and plastically deformed as shown by an arrow in the drawing to form an inward flange 11b, and the annular rigid member 10 is formed between these inward flanges 11a and 11b. Fix by pinching.

  When the partition wall 6 is configured in this way, the annular rigid member 10 is firmly sandwiched between the inward flanges 11a and 11b of both end portions of the circumscribed rigid cylindrical member 11, so that the annular rigidity The circumscribed rigid cylindrical member 11 can be securely attached to the member 10.

  In this case, when the annular rigid member 10 is sandwiched between the inward flanges 11a and 11b of the circumscribed rigid cylindrical member 11, the end portions of the annular rigid member 10 are respectively connected to the inward flanges 11a and 11b. As described above, at the end portion (upper end portion in the figure) of the restriction passage 9 shown in FIG. Since there is no rigidity reduction portion, it is possible to prevent the occurrence of deformation or the like due to the force in the axis C direction from the inward flange 11a.

  On the other hand, when the annular rigid member 10 is sandwiched at the end of the annular rigid member 10 on the liquid chamber 8 side (the lower side in the drawing) provided with a notch portion (not shown) instead of the depression and the radiation hole. In addition, in order to prevent deformation, breakage, and the like due to the force from the inward flange 11b, a tapered surface 10c having a smaller diameter as it goes downward is formed in advance on its outer peripheral surface as shown in FIGS. At the same time, the end portion of the circumscribed rigid cylindrical member 11 on the liquid chamber 8 side (lower side in the figure) can be folded back to a position where it is aligned with the tapered surface 10c to form the oblique inward flange 11b.

Thus, by making the flange 11b formed by folding back the end portion of the circumscribed rigid cylindrical member 11 obliquely inward as shown, the force from the oblique inward flange 11b is orthogonal to the tapered surface 10c. Since it acts in the direction, the compression direction input to the passage groove forming portion of the annular rigid member 10 on the liquid chamber 8 side can be suppressed sufficiently small, so that the liquid chamber without the recess 15 and the radiation hole 16 is provided. It is possible to prevent damage to the end portion on the 8 side.
In addition, even when a twisting force is input when the vibration isolator 1 is used, the force from the oblique inward flange 11b similarly acts in a direction orthogonal to the tapered surface 10c of the annular rigid member 10. Therefore, deformation, breakage, and the like of the restriction passage 9 can be prevented against such a twisting force.

By the way, as shown in FIGS. 1 and 2, the annular rigid member 10 of the partition wall 6 is fitted to the outer peripheral surface of the inner cylinder 2 to be frictionally engaged, and the outer diameter of the inner cylinder 2 is determined by the fitting portion 2 a. Is smaller in diameter than a portion 2b fixed to the main rubber 4 on the upper side of the figure via a flat surface step 2m perpendicular to the central axis C of the inner cylinder 2, and an annular shape is formed around the flat surface step 2m. It is preferable that a portion 10d on the radially inner side of the recess 15 provided in the rigid member 10 is brought into contact.
In addition, here, as shown in FIG. 2, it is preferable that the inner peripheral surface of the annular rigid member 10 has a tapered shape that gradually increases in diameter toward the liquid chamber 7 from the middle in the extending direction.

FIG. 4 shows another embodiment of the vibration isolator of the present invention.
The vibration isolator 1 illustrated in FIG. 4 replaces the recess 15 provided in the annular rigid member 10 shown in FIGS. 1 to 3, and in particular, an end portion of the annular rigid member 20 on the liquid chamber 7 side (upper side in the figure). In addition, an enlarged diameter portion 17 having an enlarged inner diameter is formed, and a radial hole 16 extending toward the outer peripheral side is formed on the inner peripheral surface 17a of the enlarged diameter portion 17, thereby extending in the axis C direction and on the outer peripheral side. An extending through hole 18 is formed, and the restriction passage 9 is opened to the liquid chamber 7 by the through hole 18.
Also in this embodiment, since the rigidity-reducing portion is not formed in the annular rigid member 20 as in the conventional vibration isolator, the deformation or breakage of the restriction passage 9 can be effectively prevented.

Further, in the embodiment shown in FIG. 4, the step 2 n on the outer peripheral surface of the inner cylinder 2 is formed on the lower side of the drawing as compared with that shown in FIG. When the annular rigid member 20 is frictionally engaged with the outer peripheral surface of the inner cylinder 2, the annular rigid member 20 is brought into contact with the step 2 n at the bottom surface 17 b of the enlarged diameter portion 17, thereby to obtain the annular rigid member. The positioning of 20 can be made easy.
In this case, from the viewpoint of facilitating the assembly of the annular rigid member to the outer peripheral surface of the inner cylinder, the contact between the annular rigid member and the step of the inner cylinder is greater than that of the apparatus shown in FIG. The apparatus shown in FIG. 1 in which the contact point can be visually confirmed is preferable.

DESCRIPTION OF SYMBOLS 1 Anti-vibration apparatus 2 Inner cylinder 2a The fitting part of a partition wall 2b The part fixed to the main body rubber of the upper side of a figure 2m, 2n Level difference 3 Outer cylinder 4, 5 Main body rubber 6 Partition wall 7, 8 Liquid chamber 9 Restriction passage DESCRIPTION OF SYMBOLS 10, 20 Annular rigid member 10a Reinforcement part 10b Radial outer side area | region of a hollow 10c Tapered surface 10d The location inside a radial direction of a hollow 11 Enclosed rigid cylindrical member 11a, 11b Inward flange 12 Elastic member 13 Passage groove 14 Seal member 15 Depression 16 Radiation hole 17 Expanded diameter portion 17a Inner peripheral surface 17b Bottom surface 18 Through hole

Claims (5)

An inner cylinder, an outer cylinder disposed on the outer peripheral side of the inner cylinder, a main body rubber that couples the inner cylinder and the outer cylinder in a liquid-tight manner at two locations separated in the axial direction, and an inner cylinder between the two main body rubbers. A partition wall that bisects the space between the outer cylinder and the outer cylinder in the axial direction, each liquid chamber formed by sealing an incompressible liquid in each space that separates the partition wall, and provided in the partition wall A restriction passage that provides communication between the two liquid chambers,
The partition wall is provided with an annular rigid member projecting from the inner cylinder toward the outer cylinder side, and a passage groove formed on the outer peripheral surface of the annular rigid member in a liquid-tight manner, and provided at both end portions in the axial direction. Each inward flange comprises a circumscribed rigid cylindrical member that sandwiches and fixes an annular rigid member, and an elastic member that connects the circumscribed rigid cylindrical member to the outer cylinder,
A liquid in which the restriction passage of the partition wall is constituted by a passage groove formed on the outer peripheral surface of the annular rigid member, and a circumscribed rigid cylinder member in which the opening of the passage groove is liquid-tightly closed via a seal member. An enclosed vibration isolator,
A liquid-filled vibration damping device, wherein the restriction passage is formed in an annular rigid member and extends in the axial direction and is opened to at least one liquid chamber through a through hole extending toward the outer peripheral side. One or a plurality of indentations extending in the axial direction are provided on the end surface of the annular rigid member on the side of at least one liquid chamber in the radial direction inside the restriction passage,
The liquid-filled vibration isolator according to claim 1, wherein the restriction passage is opened to at least one of the liquid chambers by a radial hole extending from the depression to the outer peripheral side. The annular rigid member of the partition wall is frictionally engaged with the outer peripheral surface of the inner cylinder, and the outer peripheral surface of the inner cylinder is fitted with the partition wall through a flat surface step perpendicular to the central axis of the inner cylinder. With a small diameter,
The liquid-filled vibration isolator according to claim 2, wherein a portion of the end surface of the annular rigid member that is radially inward of the recess is brought into contact with the step of the inner cylinder. An annular rigid member having a passage groove formed on the outer peripheral surface, forming the inner peripheral side portion of the partition wall from the other end side of the inner cylinder made of a rigid material, with one main body rubber fixed to the outer peripheral surface on one end side, Each of the fitting cylinders made of a rigid material, which are connected to the inner circumferential surface of the outer cylinder by other main body rubbers, are sequentially fitted, and are frictionally engaged with the outer circumferential surface of the inner cylinder, and the partition walls are separated from each other. In manufacturing a liquid-filled vibration isolator by filling an incompressible liquid in the space,
The annular rigid member is preliminarily formed with one or more recesses extending in the axial direction on the radial inner side of the passage groove, and a radial hole extending from the recess toward the outer peripheral side. And
The annular rigid member is frictionally engaged with the inner side of the circumscribed rigid cylindrical member via the seal member, and a radially outer region of the recess formed in the annular rigid member is provided at one end portion of the circumscribed rigid cylindrical member. By positioning it in contact with the inward flange, after that, the other end portion of the circumscribed rigid cylindrical member is folded inward and plastically deformed, and an annular rigid member is sandwiched and fixed inside the circumscribed rigid cylindrical member. The manufacturing method of the liquid enclosure type vibration isolator which forms a partition wall.   A taper in which the other end portion of the circumscribed rigid cylindrical member is formed on the outer peripheral surface of the end portion of the annular rigid member after the annular rigid member is positioned inside the circumscribed rigid cylindrical member by friction engagement with the seal member. The manufacturing method of the liquid filled type vibration isolator of Claim 4 which forms a partition wall by carrying out plastic deformation to the position which aligns with a surface.

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