Vibration isolation device

Abstract

To provide a vibration prevention device with a new structure capable of restraining a body rubber outer member from being detached from a drawing metal fitting, at the time of fixing by reducing diameters of the body rubber outer member and the drawing metal fitting constituting a second mounting member.SOLUTION: In a vibration prevention device 10, a second mounting member 18 includes a body rubber outer member 34 having a first tubular part 36 affixed to an outer peripheral end of a body rubber elastic body 20, and a drawing metal fitting 54 having a second tubular part 54 mounted to the first tubular part 36 of the body rubber outer member 34 under an extrapolation condition. The first tubular part 36 of the body rubber outer member 34 is inserted into the second tubular part 54 of the drawing metal fitting 54 in an axial direction, and the second tubular part 54 is fitted with an outer periphery of the first tubular part 36 by diameter-reduction processing. The fitting portion of the first tubular part 36 and the second tubular part 54 comprises tapered parts 42, 66 whose diameter gets smaller toward a detachment direction opposite to a direction, in which the first tubular part 36 is inserted into the second tubular part 54.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vibration isolation device applied to an engine mount or the like of an automobile and a method for manufacturing the vibration isolation device.

Background Art

[0002] Conventionally, a vibration isolation device applied to an engine mount or the like that vibrationally connects a power unit of an automobile and a vehicle body has been known. The vibration isolation device has a structure in which, for example, as described in Japanese Patent Application Laid-Open No. 7-190130 (Patent Document 1), a first mounting member and a second mounting member are connected by a main body rubber elastic body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in Patent Document 1, a cylindrical connecting fitting is fixed to the outer peripheral end portion of the main body rubber elastic body, and a cylindrical fitting cylinder portion is externally inserted into the connecting fitting, and the fitting cylinder portion is subjected to a diameter reduction process, whereby the connecting fitting and the fitting cylinder portion are fixed to each other, and the second mounting member is formed.

[0005] However, in the fitting and fixing with the connecting fitting by the diameter reduction of the fitting cylinder portion as described above, it was considered that the connecting fitting may be pushed out in the direction of coming off with respect to the fitting cylinder portion by the force exerted on the connecting fitting from the fitting cylinder portion during diameter reduction, and the positions of the connecting fitting and the fitting cylinder portion in the axial direction may be relatively displaced.

[0006] The problem to be solved by the present invention is to provide a novel vibration isolation device and a novel method for manufacturing a vibration isolation device that can suppress the relative movement of the main body rubber outer member in the direction of removal from the throttling fitting when fixing the main body rubber outer member and the throttling fitting by reducing the diameter of the throttling fitting, which constitute the second mounting member. [Means for solving the problem]

[0007] The following describes preferred embodiments for understanding the present invention. However, each embodiment described below is illustrative and can be combined with others as appropriate. Furthermore, the multiple components described in each embodiment can be recognized and adopted as independently as possible, and can be combined with any component described in another embodiment as appropriate. Thus, the present invention is not limited to the embodiments described below, and various other embodiments can be realized.

[0008] The first embodiment is a vibration damping device in which a first mounting member and a second mounting member are connected by a main rubber elastic body, wherein the second mounting member comprises a main rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main rubber elastic body, and a diaphragm fitting having a second cylindrical portion attached to the first cylindrical portion of the main rubber outer member in an externally fitted state, wherein the first cylindrical portion of the main rubber outer member is inserted axially into the second cylindrical portion of the diaphragm fitting, and the second cylindrical portion is fitted to the outer peripheral surface of the first cylindrical portion by diameter reduction processing, and the fitted portions of the first cylindrical portion and the second cylindrical portion each have a tapered portion that becomes smaller in diameter in the direction of removal opposite to the direction of insertion of the first cylindrical portion into the second cylindrical portion. Furthermore, the tapered portion is provided along the entire axial direction of the first cylindrical portion. They exist.

[0009] According to the vibration isolation device constructed in accordance with this embodiment, when the aperture fitting is fitted and fixed to the main rubber outer member by the diameter reduction process, the tapered portion provided on the first cylindrical part of the main rubber outer member and the tapered portion provided on the second cylindrical part of the aperture fitting are fitted together, so that the force that reduces the diameter of the aperture fitting is transmitted to the main rubber outer member as a component force in the direction of insertion into the aperture fitting. Therefore, the main rubber outer member is prevented from coming out in the opposite direction to the insertion direction into the aperture fitting, and the relative positional displacement of the main rubber outer member with respect to the aperture fitting can be suppressed. Furthermore, in a vibration isolation device with a structure according to this embodiment, a tapered portion is provided throughout the first cylindrical portion located on the inner circumference of the second cylindrical portion, which facilitates alignment between the tapered portion of the first cylindrical portion and the tapered portion of the second cylindrical portion, allowing the tapered portions to be fitted together more securely.

[0012] The two The manner of is, One In the vibration isolation device described in the embodiment, a sealing rubber is interposed between the overlapping surfaces of the tapered portions.

[0013] According to the vibration isolation device constructed in this embodiment, the tapered portion of the first cylindrical part and the tapered portion of the second cylindrical part are pressed against each other via a sealing rubber, thereby allowing the axial component force to be applied more efficiently to the main rubber outer member. Furthermore, the overlapping surfaces of the tapered portions can be sealed with the sealing rubber.

[0014] The three The embodiment is a vibration damping device in which a first mounting member and a second mounting member are connected by a main rubber elastic body, wherein the second mounting member comprises a main rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main rubber elastic body, and a throttling fitting having a second cylindrical portion attached to the first cylindrical portion of the main rubber outer member in an externally fitted state, wherein the first cylindrical portion of the main rubber outer member is inserted axially into the second cylindrical portion of the throttling fitting, and a sealing rubber is interposed between the first cylindrical portion and the second cylindrical portion. , applicable The second cylindrical portion is pressed against the sealing rubber by a diameter reduction process and fitted to the outer surface of the first cylindrical portion, and the portion of the second cylindrical portion that contacts the sealing rubber has a tapered portion that becomes smaller in diameter in the direction of withdrawal opposite to the direction of insertion of the first cylindrical portion into the second cylindrical portion.

[0015] According to the vibration isolation device constructed in accordance with this embodiment, when attaching the aperture fitting to the main rubber outer member by reducing its diameter, the tapered portion provided on the first cylindrical part of the main rubber outer member and the tapered portion provided on the second cylindrical part of the aperture fitting are fitted together, thereby transmitting the force that reduces the diameter of the aperture fitting to the main rubber outer member as a component force in the direction of insertion into the aperture fitting. Therefore, the main rubber outer member is prevented from coming out in the opposite direction to the insertion direction into the aperture fitting, and the relative positional displacement of the main rubber outer member with respect to the aperture fitting can be suppressed.

[0016] The four The manner is as follows: three In a vibration isolation device described in any one of the embodiments, a first outer flange portion projecting outward is provided at one axial end of the first cylindrical portion of the main body rubber outer member, and a second outer flange portion projecting outward is provided at one axial end of the second cylindrical portion of the throttling fitting, and the tapered portion provided on at least one of the first cylindrical portion and the second cylindrical portion gradually decreases in diameter in the axial direction toward the first outer flange portion and the second outer flange portion, and a crimping fitting is provided to crimp and fix the first outer flange portion and the second outer flange portion which are superimposed on each other in a contact state.

[0017] In the vibration isolation device constructed according to this embodiment, the relative axial positional displacement between the main rubber outer member and the throttling fitting is prevented in the insertion direction of the first cylindrical portion into the second cylindrical portion by the contact between the first outer flange portion and the second outer flange portion. Therefore, the relative axial positional displacement between the main rubber outer member and the throttling fitting is suppressed in the withdrawal direction of the first cylindrical portion from the second cylindrical portion by the fitting of the tapered portion of the first cylindrical portion and the tapered portion of the second cylindrical portion, thereby enabling the main rubber outer member and the throttling fitting to be positioned on both sides in the axial direction.

[0018] Furthermore, by crimping and fixing the first outer flange portion and the second outer flange portion in contact with each other using a crimping fitting, the main body rubber outer member and the throttling fitting can be positioned more firmly in the axial direction.

[0019] The Five The manner is as follows: four In a vibration isolation device described in any one of the embodiments, a pressure-receiving chamber is provided in which a part of the wall portion is made of the main body rubber elastic material, and a balance chamber is provided in which a part of the wall portion is made of a flexible membrane, an incompressible fluid is sealed in the pressure-receiving chamber and the balance chamber, and an orifice passage is provided that connects the pressure-receiving chamber and the balance chamber to each other, and the throttling fitting is a diaphragm outer fitting fixed to the outer peripheral end of the flexible membrane.

[0020] The vibration isolation device constructed according to this embodiment is a fluid-filled vibration isolation device in which an incompressible fluid is sealed inside. From the viewpoint of preventing fluid leakage, for example, it is important that the main rubber outer member and the diaphragm outer fitting are positioned in an appropriate relative position in the axial direction. Therefore, in the fluid-filled vibration isolation device, by employing axial positioning of the main rubber outer member and the diaphragm outer fitting by fitting a tapered portion, problems such as leakage of the sealed fluid can be prevented.

[0021] The Six The manner of is, Five In the vibration isolation device described in the embodiment, the lower end of the first cylindrical portion of the main body rubber outer member is provided with a first inner flange portion that protrudes inward, and the lower end of the second cylindrical portion of the throttling fitting is provided with a second inner flange portion that protrudes inward, and the first inner flange portion and the second inner flange portion are separated from each other in the vertical direction and face each other, and a partition member that separates the pressure receiving chamber and the equilibrium chamber is sandwiched between the opposing first inner flange portion and the second inner flange portion.

[0022] According to the vibration isolator structured in accordance with this aspect, since the main body rubber outer member having the first inner flange portion and the diaphragm outer fitting having the second inner flange portion are positioned at appropriate positions in the axial direction by fitting of the tapered portion, the partition member is appropriately sandwiched between the first inner flange portion and the second inner flange portion, preventing an unintended short circuit of the enclosed fluid between the pressure receiving chamber and the equilibrium chamber, generation of abnormal noise due to rattling of the partition member, and the like.

Effect of the Invention

[0025] According to the present invention, when fixing the main body rubber outer member and the throttle fitting that constitute the second mounting member of the vibration isolator by reducing the diameter, relative movement of the main body rubber outer member in the direction of coming off with respect to the throttle fitting can be suppressed.

Brief Description of the Drawings

[0026] [Figure 1] Cross-sectional view showing an engine mount as a first embodiment of the present invention [Figure 2] Cross-sectional view of the first integrally vulcanized molded product constituting the engine mount shown in FIG. 1 [Figure 3] Cross-sectional view of the second integrally vulcanized molded product constituting the engine mount shown in FIG. 1 [Figure 4] Cross-sectional view showing a part of the mount body constituting the engine mount shown in FIG. 1 [Figure 5] Cross-sectional view showing a part of the mount body constituting an engine mount as another embodiment of the present invention

Mode for Carrying Out the Invention

[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0028] Figure 1 shows an engine mount 10 for an automobile as a first embodiment of a vibration damping device with a structure according to the present invention. The engine mount 10 has a structure in which an outer bracket 14 is attached to a mount body 12. The mount body 12 comprises a first integrally vulcanized molded product 22 (see Figure 2) in which a first mounting member 16 and a second mounting member 18 are connected by a main body rubber elastic body 20. In the following description, the vertical direction generally refers to the vertical direction in Figure 1, which is the direction of extension of the mount's central axis.

[0029] The first mounting member 16 is a hard member made of metal or the like, and integrally comprises a substantially disc-shaped stopper portion 24, a substantially inverted cone-shaped fixing portion 26 that protrudes downward from the stopper portion 24 and whose diameter decreases downward, and a substantially cylindrical threaded portion 28 that protrudes upward from the stopper portion 24. The first mounting member 16 has a screw hole 30 that opens on the upper surface of the threaded portion 28 and extends in the vertical direction, and a stud bolt 32 is screwed into the screw hole 30 and protrudes upward.

[0030] The second mounting member 18 includes a main rubber outer member 34. The main rubber outer member 34 is a hard member made of metal or the like, similar to the first mounting member 16, and is an annular in shape with a large diameter. More specifically, the main rubber outer member 34 has a first cylindrical portion 36 which is roughly cylindrical, and integrally includes a first outer flange portion 38 that protrudes outward from the upper end of the first cylindrical portion 36 and a first inner flange portion 40 that protrudes inward from the lower end of the first cylindrical portion 36. As shown in Figure 2, the first cylindrical portion 36 is tapered cylindrical in shape, with the diameter decreasing upward, and the entire portion is a first tapered portion 42. The inclination angle of the first tapered portion 42 with respect to the axial direction is preferably within the range of 5 to 30°, thereby effectively achieving the fitting and fixing of the first tapered portion 42 and the second tapered portion 66 when the second tapered portion 66 is fitted, as described later, while effectively applying a downward component force to the main rubber outer member 34. The radial width dimension of the first outer flange portion 38 is larger than the radial width dimension of the first inner flange portion 40. Furthermore, the curvature of the curved portion connecting the first cylindrical portion 36 and the first outer flange portion 38 is larger than the curvature of the curved portion connecting the first cylindrical portion 36 and the first inner flange portion 40.

[0031] The first mounting member 16 and the main rubber outer member 34 are connected by the main rubber elastic body 20. The main rubber elastic body 20 is roughly frustoconical in shape, with the fixing portion 26 of the first mounting member 16 vulcanized and bonded to the upper end which has a smaller diameter, and the main rubber outer member 34 vulcanized and bonded to the outer circumferential surface of the lower end which has a larger diameter. The first mounting member 16 has stopper rubber 44, which is integrally formed with the main rubber elastic body 20, fixed to the outer circumferential surface and upper surface of the stopper portion 24. The main rubber outer member 34 has the entire inner circumferential surface of the first cylindrical portion 36, the upper surface of the inner circumferential portion of the first outer flange portion 38, and the entire surface of the first inner flange portion 40 fixed to the main rubber elastic body 20. The main rubber elastic body 20 has a recess 46 that opens to the lower surface on the inner circumferential side of the first inner flange portion 40.

[0032] Furthermore, the mount body 12 includes a second integrally vulcanized molded product 52 in which a diaphragm outer fitting 50, which serves as a diaphragm fitting, is vulcanized and bonded to a flexible membrane 48 as shown in Figure 3. The flexible membrane 48 has a thin-walled circular dome shape in the central part in the radial direction, and a longitudinal cross-sectional shape in which the outer circumference slopes upward toward the outer circumference, giving it slack in the vertical direction.

[0033] The outer peripheral end of the flexible membrane 48 is fixed to the diaphragm outer fitting 50. The diaphragm outer fitting 50 integrally comprises a second cylindrical portion 54 which is substantially cylindrical in shape, a second outer flange portion 56 which protrudes outward on the upper side of the second cylindrical portion 54, and a second inner flange portion 58 which protrudes inward on the lower side of the second cylindrical portion 54. The outer peripheral end of the flexible membrane 48 is fixed to the second inner flange portion 58 of the diaphragm outer fitting 50. In the state shown in Figure 3 before the diameter reduction process described later, the lower part of the second cylindrical portion 54 is an expanding portion 60 which becomes larger in diameter upward in the axial direction, and the part above the expanding portion 60 extends axially with a substantially constant diameter.

[0034] The inner circumferential surface of the second cylindrical portion 54 of the diaphragm outer fitting 50 is covered by a cylindrical sealing rubber 62 integrally formed with a flexible film 48. A sealing lip 64 that protrudes inward is continuously provided around the entire circumference of the upper end portion of the sealing rubber 62. The upper end of the sealing rubber 62 is located below the curved portion connecting the second cylindrical portion 54 and the second outer flange portion 56 of the diaphragm outer fitting 50.

[0035] The first integrally vulcanized molded product 22 and the second integrally vulcanized molded product 52, which are constructed in this manner, are assembled together by fixing the first cylindrical portion 36 of the main body rubber outer member 34 and the second cylindrical portion 54 of the diaphragm outer fitting 50. More specifically, the first cylindrical portion 36 is inserted into the second cylindrical portion 54 from above in an axial direction downward, and the upper part of the second cylindrical portion 54 fitted onto the first cylindrical portion 36 is reduced in diameter so that the upper part of the second cylindrical portion 54 is fitted onto the outer circumferential surface of the first cylindrical portion 36. As a result, the main body rubber outer member 34 and the diaphragm outer fitting 50 are temporarily fixed together, and the second mounting member 18 is formed by the main body rubber outer member 34 and the diaphragm outer fitting 50. In this embodiment, the insertion direction of the first cylindrical portion 36 into the second cylindrical portion 54 is downward, and the withdrawal direction of the first cylindrical portion 36 from the second cylindrical portion 54 is upward.

[0036] With the main body rubber outer member 34 and the diaphragm outer fitting 50 fitted and fixed together, the upper part of the sealing rubber 62 is interposed between the first cylindrical portion 36 and the second cylindrical portion 54, and the first cylindrical portion 36 and the second cylindrical portion 54 are fitted together via the sealing rubber 62. Therefore, the overlapping surfaces of the first cylindrical portion 36 and the second cylindrical portion 54 are sealed by the sealing rubber 62.

[0037] As shown in Figure 4, the second cylindrical portion 54 of the diaphragm outer fitting 50 is subjected to a diameter reduction process, resulting in the formation of a second tapered portion 66 at its upper end, corresponding to the first cylindrical portion 36 (first tapered portion 42) of the main rubber outer member 34. That is, above the expanding portion 60 of the second cylindrical portion 54, a second tapered portion 66 is formed by the diameter reduction process, becoming smaller in diameter towards the top. In short, during the diameter reduction process of the diaphragm outer fitting 50, the upper end portion of the second cylindrical portion 54 undergoes a larger reduction in diameter deformation towards the top. The inclination angle of the second tapered portion 66 with respect to the axial direction may differ from that of the first tapered portion 42, but preferably it is approximately the same as that of the first tapered portion 42. Furthermore, as shown in Figure 1, the expanding portion 60 after the diameter reduction process has a tapered shape at its upper end, while the portion below it has a straight shape extending with approximately constant diameter dimensions. Figure 4 shows a hypothetical representation of the diaphragm outer fitting 50 before the diameter reduction process, indicated by a dashed line.

[0038] In this way, by performing a diameter reduction process so that a second tapered portion 66 is formed at the upper end of the second cylindrical portion 54, when the force due to the diameter reduction process is transmitted from the upper end of the second cylindrical portion 54 to the first cylindrical portion 36, a downward component force acts on the first cylindrical portion 36, making it difficult for the first cylindrical portion 36 to move upward, which would cause it to detach from the second cylindrical portion 54. In this embodiment, since the fitting portion of the second cylindrical portion 54 in the first cylindrical portion 36 is a first tapered portion 42 that becomes smaller in diameter towards the top, the downward component force acts more efficiently when the input during the diameter reduction process is transmitted from the second cylindrical portion 54 to the first cylindrical portion 36.

[0039] Because the first tapered portion 42 is provided over the entire length of the first cylindrical portion 36, even if the first cylindrical portion 36 is covered by the second cylindrical portion 54 and the first tapered portion 42 is difficult to confirm by visual inspection, etc., even if the second tapered portion 66 is formed on the second cylindrical portion 54 by diameter reduction processing, the second tapered portion 66 can be formed in a position corresponding to the first tapered portion 42 and fitted onto the first tapered portion 42.

[0040] The presence of a sealing rubber 62 between the fitting surfaces of the first tapered portion 42 of the first cylindrical portion 36 and the second tapered portion 66 of the second cylindrical portion 54 prevents damage to the fitting portion between the first tapered portion 42 and the second tapered portion 66, and also allows the input from the second tapered portion 66 to be distributed to the first tapered portion 42 for efficient operation.

[0041] The sealing rubber 62 is sandwiched and compressed between the first cylindrical portion 36 and the second cylindrical portion 54, thereby liquid-tightly sealing the radial overlapping surfaces of the first cylindrical portion 36 and the second cylindrical portion 54. In particular, in this embodiment, a sealing lip 64 is provided on the portion of the sealing rubber 62 that contacts the first cylindrical portion 36, thereby ensuring stable liquid tightness.

[0042] In the assembly of the main rubber outer member 34 and the diaphragm outer fitting 50 by the diameter reduction process described above, the first outer flange portion 38 of the main rubber outer member 34 and the second outer flange portion 56 of the diaphragm outer fitting 50 may be in contact with each other in the vertical direction, or they may overlap while slightly separated. Also, the first inner flange portion 40 of the main rubber outer member 34 and the second inner flange portion 58 of the diaphragm outer fitting 50 face each other while separated in the vertical direction. Furthermore, the first tapered portion 42 of the first cylindrical portion 36 has a smaller diameter toward the first outer flange portion 38, and the second tapered portion 66 of the second cylindrical portion 54 has a smaller diameter toward the second outer flange portion 56.

[0043] A fluid chamber 68 is formed between the first integrally vulcanized molded product 22 and the second integrally vulcanized molded product 52. The fluid chamber 68 is located on the inner circumference side of the second mounting member 18, between the main rubber elastic body 20 and the flexible membrane 48 in the axial direction, and is liquid-tightly separated from the outside. An incompressible fluid consisting of a liquid such as water or ethylene glycol is sealed inside the fluid chamber 68.

[0044] A partition member 70 is housed in the fluid chamber 68. The partition member 70 is generally disc-shaped and has a structure in which a lid member 74 is attached to the upper surface of the partition member body 72.

[0045] The partition member body 72 is roughly disc-shaped and is made of, for example, metal or a hard synthetic resin. A roughly circular receiving recess 76 opening on the upper surface is formed in the central part of the partition member body 72. A circumferential groove 78 is formed on the outer circumference of the partition member body 72, opening on the upper surface and the outer circumference and extending in the circumferential direction for a length of less than one full turn. The portion of the partition member body 72 in which the circumferential groove 78 is formed protrudes downward from the portion in which the receiving recess 76 is formed, and its vertical dimension is larger.

[0046] The lid member 74 is thinner than the partition member body 72 and has a roughly disc shape; in this embodiment, it is made of a metal plate. The lid member 74 is superimposed on the upper surface of the partition member body 72, and is fixed to the partition member body 72 by, for example, inserting a fixing pin 80 that protrudes upward from the partition member body 72 into a fixing hole that penetrates the lid member 74 and then enlarging the tip of the pin.

[0047] A movable membrane 82 is housed in a receiving recess 76 whose opening is covered by a lid member 74. The movable membrane 82 is roughly disc-shaped and made of an elastic material such as rubber or resin elastomer. The movable membrane 82 is thicker at its outer peripheral end in the vertical direction, while its central portion is thinner than the outer peripheral end. The movable membrane 82 is inserted into the receiving recess 76, with its thickened outer peripheral end being supported by being sandwiched vertically between the bottom wall of the receiving recess 76 and the lid member 74, while its thinned central portion is positioned vertically away from both the bottom wall of the receiving recess 76 and the lid member 74, allowing for vertical deformation.

[0048] The partition member 70, which has such a movable membrane 82, is arranged to spread out perpendicular to the axis within the fluid chamber 68. The outer peripheral end of the partition member 70 is inserted between the first inner flange portion 40 of the main rubber outer member 34 and the second inner flange portion 58 of the diaphragm outer fitting 50, and its upper and lower surfaces are indirectly overlapped with the first and second inner flange portions 40 and 58 via rubber, respectively, and are held between the first and second inner flange portions 40 and 58. In addition, the outer peripheral surface of the partition member 70 is pressed against the sealing rubber 62 that covers the inner peripheral surface of the diaphragm outer fitting 50, and its outer peripheral surface is supported by the diaphragm outer fitting 50, while the overlapping surfaces with the diaphragm outer fitting 50 are liquid-tightly sealed by the sealing rubber 62. The upper and lower surfaces of the outer peripheral ends of the partition member 70 are sealed by being pressed against the first and second inner flange portions 40 and 58 via rubber when the second mounting member 18 and outer bracket 14 are attached, as described later. However, they may also be sealed, for example, when the diaphragm outer fitting 50 is fitted onto the main rubber outer member 34.

[0049] The partition member 70 is placed in the fluid chamber 68, dividing the fluid chamber 68 into upper and lower sections. The upper part of the fluid chamber 68 above the partition member 70 is a pressure-receiving chamber 84, in which part of the wall is made of the main rubber elastic body 20, and internal pressure fluctuations are induced when vibration is input. The lower part of the fluid chamber 68 below the partition member 70 is a balance chamber 86, in which part of the wall is made of a flexible membrane 48, and volume changes are permitted due to the deformation of the flexible membrane 48. In short, the pressure-receiving chamber 84 and the balance chamber 86 are separated by the partition member 70. Both the pressure-receiving chamber 84 and the balance chamber 86 are filled with the incompressible fluid described above.

[0050] The pressure-receiving chamber 84 and the balance chamber 86 are connected to each other by an orifice passage 88 formed by a circumferential groove 78. Specifically, the circumferential groove 78 is tunnel-shaped, with its upper opening covered by a lid member 74 and its outer opening covered by a diaphragm outer fitting 50. One end of the groove communicates with the pressure-receiving chamber 84 through a first communication hole 90 formed in the lid member 74, and the other end communicates with the balance chamber 86 through a second communication hole 92 formed in the partition member body 72. Thus, the orifice passage 88 connecting the pressure-receiving chamber 84 and the balance chamber 86 is formed by a circumferential groove 78 extending circumferentially from the outer end of the partition member 70. The resonance frequency (tuning frequency) of the fluid flowing through the orifice passage 88, which is tuned based on the ratio of the passage length to the passage cross-sectional area, is adjusted to a low frequency corresponding to engine shake. When low-frequency, large-amplitude vibrations such as engine shake are input between the first mounting member 16 and the second mounting member 18, fluid flow actively occurs in a resonant state through the orifice passage 88 between the pressure-receiving chamber 84 and the equilibrium chamber 86 based on the relative internal pressure difference between the pressure-receiving chamber 84 and the equilibrium chamber 86, and a vibration-damping effect (high damping effect) is exerted based on the fluid action of the sealed liquid.

[0051] The movable membrane 82, positioned in the receiving recess 76 of the partition member 70, is subjected to the hydraulic pressure of the pressure receiving chamber 84 on its upper surface and the hydraulic pressure of the equilibrium chamber 86 on its lower surface. Specifically, the portion of the lid member 74 covering the opening of the receiving recess 76 is provided with a plurality of first through-holes 94 that penetrate vertically, and the hydraulic pressure of the pressure receiving chamber 84 is applied to the upper surface of the central portion of the movable membrane 82 through these first through-holes 94. In addition, the bottom wall of the receiving recess 76 is provided with a plurality of second through-holes 96 that penetrate vertically, and the hydraulic pressure of the equilibrium chamber 86 is applied to the lower surface of the central portion of the movable membrane 82 through these second through-holes 96. The central portion of the movable membrane 82 is made deformable vertically based on the relative hydraulic pressure difference between the pressure receiving chamber 84 and the equilibrium chamber 86. When medium to high frequency small amplitude vibrations such as idling vibrations or driving noises are input between the first mounting member 16 and the second mounting member 18, the movable membrane 82 undergoes a small deformation in the thickness direction based on the relative internal pressure difference between the pressure receiving chamber 84 and the balance chamber 86. This results in a vibration damping effect (low dynamic spring action) based on a hydraulic pressure absorption action that transmits and absorbs the internal pressure of the pressure receiving chamber 84 to the balance chamber 86.

[0052] By the way, the mount body 12 can be manufactured, for example, by the following steps.

[0053] Specifically, first, a first mounting member 16 and a main body rubber outer member 34 having a first cylindrical portion 36 are prepared. Then, the prepared first mounting member 16 and main body rubber outer member 34 are set in a mold for molding the main body rubber elastic body 20, and the main body rubber elastic body 20 is vulcanized to form the first integrally vulcanized molded product 22.

[0054] Furthermore, a diaphragm outer fitting 50 equipped with a second cylindrical portion 54 is prepared. Then, the prepared diaphragm outer fitting 50 is set in a mold for molding the flexible film 48, and the flexible film 48 is vulcanized to form a second integrally vulcanized molded product 52.

[0055] Next, the partition member 70, which has been prepared separately, is inserted from above into the inner circumference of the diaphragm outer fitting 50 of the second integrally vulcanized molded product 52, and then the first integrally vulcanized molded product 22 is inserted from above into the inner circumference of the diaphragm outer fitting 50, and then into the inner circumference of the diaphragm outer fitting 50, and then into the inner circumference of the diaphragm outer fitting 50. In other words, the diaphragm outer fitting 50 is assembled to the main rubber outer member 34 by inserting the first cylindrical part 36 of the main rubber outer member 34 that constitutes the first integrally vulcanized molded product 22 into the second cylindrical part 54 of the diaphragm outer fitting 50 into which the partition member 70 has been inserted.

[0056] Then, the upper part of the second cylindrical portion 54 of the diaphragm outer fitting 50 is reduced in diameter to form a second tapered portion 66, and the second tapered portion 66 is pressed against the first tapered portion 42 of the first cylindrical portion 36 and fitted and fixed in place. As a result, the first integrally vulcanized molded product 22, the second integrally vulcanized molded product 52, and the partition member 70 are interconnected, and a mount body 12 with a fluid chamber 68 inside is obtained.

[0057] When the main rubber outer member 34 and the diaphragm outer fitting 50 are fitted and fixed together, the second tapered portion 66 is pressed against the first tapered portion 42, making it difficult for the main rubber outer member 34 (first integrally vulcanized molded product 22) to come out upward relative to the diaphragm outer fitting 50 (second integrally vulcanized molded product 52), which is the opposite direction of insertion. Therefore, the main rubber outer member 34 (first integrally vulcanized molded product 22) and the diaphragm outer fitting 50 (second integrally vulcanized molded product 52) ​​can be positioned relative to each other in the axial direction.

[0058] Furthermore, the insertion steps of the partition member 70 and the first integrally vulcanized product 22 into the second integrally vulcanized product 52, and the diameter reduction step of the diaphragm outer fitting 50, are preferably performed in an incompressible fluid, thereby sealing the incompressible fluid into the fluid chamber 68 formed inside.

[0059] An outer bracket 14, which acts as a crimping fitting, is attached to the second mounting member 18 of the mount body 12. In this embodiment, the outer bracket 14 is composed of a stopper fitting 98 that covers the upper side of the mount body 12 and a connecting member 100 that covers the lower side of the mount body 12.

[0060] The stopper fitting 98 is a highly rigid member made of metal and has a generally cylindrical shape. The upper end of the stopper fitting 98 is provided with an inner flange-shaped stopper receiving portion 102 that protrudes inward. The lower end of the stopper fitting 98 is provided with an outer flange-shaped stepped portion 104 that widens outward, and a cylindrical crimping piece 106 that protrudes downward from the outer peripheral end of the stepped portion 104. Preferably, the crimping piece 106 is slightly thinner towards the protruding tip.

[0061] The connecting member 100 is a highly rigid member made of metal or the like, and has a substantially bottomed cylindrical shape. A connecting bolt 108 is press-fitted and fixed into the bottom wall of the connecting member 100, protruding downward. An outer flange-shaped connecting flange 110 is provided at the upper end of the connecting member 100, protruding outward. The lower part of the outer peripheral end face of the connecting flange 110 is a crimping receiving surface 112 that slopes inward toward the inner circumference downward.

[0062] The outer bracket 14 is fixed to the second mounting member 18 of the mount body 12. Specifically, the crimping piece 106 of the stopper fitting 98 is fitted onto the first outer flange portion 38 of the main body rubber outer member 34 and the second outer flange portion 56 of the diaphragm outer fitting 50, while the stepped portion 104 of the stopper fitting 98 is superimposed on the first outer flange portion 38 from above. The upper end of the connecting member 100 is inserted into the inner circumference of the crimping piece 106 and superimposed on the second outer flange portion 56 from below. The lower end of the crimping piece 106 is then bent inward and crimped to the crimping receiving surface 112 of the connecting flange 110 of the connecting member 100.

[0063] The stopper fitting 98 and the connecting member 100 are crimped and fixed together, so that the first outer flange portion 38 of the main rubber outer member 34 and the second outer flange portion 56 of the diaphragm outer fitting 50 are sandwiched between the stepped portion 104 of the stopper fitting 98 and the connecting flange 110 of the connecting member 100. In this way, the outer bracket 14 is crimped and fixed to the first outer flange portion 38 and the second outer flange portion 56, thereby attaching the outer bracket 14 to the second mounting member 18.

[0064] When the crimping piece 106 is pressed against the crimping receiving surface 112, a force acting in the vertical direction to bring the stopper fitting 98 and the connecting member 100 closer together is exerted, biasing the first outer flange portion 38 and the second outer flange portion 56 of the second mounting member 18 toward each other and causing them to come into contact. As a result, the main body rubber outer member 34 and the diaphragm outer fitting 50 are positioned in appropriate relative positions in the vertical direction, thereby stabilizing the shape of the second mounting member 18.

[0065] In the standalone state of the mount body 12 before the outer bracket 14 is attached, the main body rubber outer member 34 and the diaphragm outer fitting 50 are prevented from having large relative vertical displacements by the fitting of the first and second tapered portions 42 and 66. Therefore, for example, the first outer flange portion 38 and the second outer flange portion 56 do not separate widely, making it difficult to crimp and fix the crimping piece 106 to the connecting flange 110, and the outer bracket 14 is stably attached to the mount body 12. Consequently, the engine mount 10 achieves high dimensional accuracy in the vertical direction and stabilizes vibration damping performance by ensuring liquid tightness at the outer peripheral end of the partition member 70.

[0066] The main rubber outer member 34 and the diaphragm outer fitting 50 are firmly positioned in contact with each other by the outer bracket 14, which acts as a crimping fitting, by crimping the first outer flange portion 38 and the second outer flange portion 56. As a result, the relative positions of the first integrally vulcanized molded product 22, which includes the main rubber outer member 34, and the second integrally vulcanized molded product 52, which includes the diaphragm outer fitting 50, are set with high precision. Therefore, for example, the first and second inner flange portions 40 and 58 are pressed against the outer peripheral end of the partition member 70 with a predetermined force in the axial direction, ensuring liquid tightness between the first and second inner flange portions 40 and 58 and the partition member 70, and preventing the generation of abnormal noise due to rattling of the partition member 70. Thus, in a fluid-filled vibration isolation device where the axial relative position between the main rubber outer member 34 and the diaphragm outer fitting 50 easily affects vibration isolation performance, liquid tightness, noise reduction, etc., the desired performance can be stably obtained by providing a mechanism to prevent detachment through the fitting of the first and second tapered portions 42 and 66.

[0067] In the engine mount 10, the first inner flange portion 40 is indirectly superimposed on the upper surface of the partition member 70 via a part of the main rubber elastic body 20 fixed to its lower surface, and the part of the main rubber elastic body 20 serves as a sealing rubber that seals the overlapping surfaces of the first inner flange portion 40 and the partition member 70. Furthermore, the second inner flange portion 58 is indirectly superimposed on the lower surface of the partition member 70 via the outer peripheral end of the flexible film 48 fixed to its upper surface, and the outer peripheral end of the flexible film 48 serves as a sealing rubber that seals the overlapping surfaces of the second inner flange portion 58 and the partition member 70.

[0068] Figure 5 shows a part of the mount body 120 that constitutes an engine mount as a second embodiment of the present invention. The mount body 120 has a second mounting member 122 which is composed of a main rubber outer member 124 and a diaphragm outer fitting 50. In the following description, components and parts that are substantially the same as those in the first embodiment are denoted by the same reference numerals in the figures and their descriptions are omitted. Also, parts not shown in Figure 5 are the same as in the first embodiment.

[0069] In this embodiment, the main body rubber outer member 124 has a substantially cylindrical shape in which the first cylindrical portion 36 extends without inclination with respect to the axial direction, and does not have a first tapered portion like in the first embodiment. Furthermore, a seal rubber 128, which is integrally formed with the main body rubber elastic body 20, is fixed to the outer circumferential surface of the first cylindrical portion 126. The seal rubber 128 has a substantially constant thickness dimension in the standalone state of the first integrally vulcanized molded product 22. Since the seal rubber 128 is provided on the main body rubber outer member 124 side, the seal rubber 130 fixed to the inner circumferential surface of the second cylindrical portion 54 of the diaphragm outer fitting 50 is located below the seal rubber 128.

[0070] The main rubber outer member 124 and the diaphragm outer fitting 50 are fitted and fixed together by the reduction in diameter of the second cylindrical portion 54. Specifically, the upper part of the second cylindrical portion 54 of the diaphragm outer fitting 50 is fitted onto the first cylindrical portion 126 of the main rubber outer member 124, and the portion of the second cylindrical portion 54 fitted onto the first cylindrical portion 126 is processed to reduce its diameter, so that the second cylindrical portion 54 is pressed against the first cylindrical portion 126 via the sealing rubber 128, and the diaphragm outer fitting 50 is fitted and fixed to the main rubber outer member 124.

[0071] The second cylindrical portion 54 of the diaphragm outer fitting 50 is reduced in diameter with a larger reduction deformation amount towards the top, so that the upper part becomes smaller towards the top. As a result, after the reduction processing, the diaphragm outer fitting 50 has a second tapered portion 66 formed on the upper part of the second cylindrical portion 54, which is a tapered portion that becomes smaller towards the top.

[0072] During the diameter reduction process, the second tapered portion 66 is pressed against the sealing rubber 128 interposed between the first cylindrical portion 126 and the second cylindrical portion 54. As a result, the diameter reduction force applied to the second tapered portion 66 acts not only radially inward on the main rubber outer member 124, but also downward. Therefore, during the diameter reduction process, upward lifting of the main rubber outer member 124 relative to the diaphragm outer fitting 50 is prevented, and the main rubber outer member 124 and the diaphragm outer fitting 50 are positioned in the appropriate relative position in the axial direction.

[0073] Thus, when a sealing rubber 128 is interposed between the first cylindrical portion 126 and the second cylindrical portion 54, a downward component force can be applied to the main rubber outer member 124 during the diameter reduction process of the second cylindrical portion 54 by the tapered portion 66 provided on the second cylindrical portion 54 alone, without providing a tapered portion on the first cylindrical portion 126.

[0074] Furthermore, while it is preferable that the sealing rubber interposed between the first cylindrical portion 126 and the second cylindrical portion 54 be fixed to the outer circumferential surface of the first cylindrical portion 126, it may also be fixed to the inner circumferential surface of the second cylindrical portion 54 and pressed against the outer circumferential surface of the first cylindrical portion 126, for example, as in the first embodiment. In this case as well, the first cylindrical portion 126 without a tapered portion can apply a downward component force to the main body rubber outer member 124.

[0075] Although embodiments of the present invention have been described in detail above, the present invention is not limited by its specific description. For example, in the case where tapered portions are provided for the first cylindrical portion 36 and the second cylindrical portion 54 in the first embodiment, the tapered portion 42 of the first cylindrical portion 36 and the tapered portion 66 of the second cylindrical portion 54 may be directly overlapped and fitted together without the use of sealing rubber.

[0076] In the first embodiment, a structure was illustrated in which the first tapered portion 42 is provided along the entire length of the first cylindrical portion 36, but the first tapered portion 42 may be provided only partially on the first cylindrical portion 36. Also, in the first embodiment, a structure was illustrated in which the second tapered portion 66 is provided partially on the upper end of the second cylindrical portion 54, but the second tapered portion 66 may be provided along the entire length of the second cylindrical portion 54.

[0077] The outer bracket 14 is not mandatory, and the main rubber outer member and the aperture fitting do not necessarily need to be biased and positioned in the vertical direction by the crimping and fixing of the outer bracket 14. For example, the main rubber outer member and the aperture fitting can be positioned relative to each other by fitting the aperture fitting into the main rubber outer member due to the reduction in diameter of the aperture fitting.

[0078] The application of the present invention is not limited to vibration isolation devices as described in the above embodiment, but is also applicable to solid-type vibration isolation devices. When applied to solid-type vibration isolation devices, the diaphragm outer fitting can be made of a component other than the diaphragm outer fitting, such as a bracket fitting. Furthermore, the present invention originally encompasses all of the inventions described in (i) to (viii) below, and its structure and effects are noted below. The present invention (i) A vibration damping device in which a first mounting member and a second mounting member are connected by a main body rubber elastic body, wherein the second mounting member comprises a main body rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main body rubber elastic body, and a throttling fitting having a second cylindrical portion attached to the first cylindrical portion of the main body rubber outer member in an externally fitted state, wherein the first cylindrical portion of the main body rubber outer member is inserted axially into the second cylindrical portion of the throttling fitting, and the second cylindrical portion is fitted to the outer peripheral surface of the first cylindrical portion by diameter reduction processing, and the fitted portions of the first cylindrical portion and the second cylindrical portion each have a tapered portion that becomes smaller in diameter in the direction of withdrawal opposite to the direction of insertion of the first cylindrical portion into the second cylindrical portion, (ii) The vibration isolation device according to (i), wherein the tapered portion is provided along the entire axial direction of the first cylindrical portion, (iii) The vibration isolation device according to (i) or (ii), wherein a sealing rubber is interposed between the overlapping surfaces of the tapered portion. (iv) A vibration damping device in which a first mounting member and a second mounting member are connected by a main body rubber elastic body, wherein the second mounting member comprises a main body rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main body rubber elastic body, and a throttling fitting having a second cylindrical portion attached to the first cylindrical portion of the main body rubber outer member in an externally fitted state, wherein the first cylindrical portion of the main body rubber outer member is inserted axially into the second cylindrical portion of the throttling fitting, a sealing rubber is interposed between the first cylindrical portion and the second cylindrical portion, the second cylindrical portion is pressed against the sealing rubber by diameter reduction processing and fitted to the outer peripheral surface of the first cylindrical portion, and the portion of the second cylindrical portion that contacts the sealing rubber has a tapered portion that becomes smaller in diameter in the direction of withdrawal opposite to the direction of insertion of the first cylindrical portion into the second cylindrical portion, (v) The vibration isolation device according to any one of (i) to (iv), wherein the first cylindrical portion of the main body rubber outer member has a first outer flange portion that protrudes outward from one end in the axial direction, and the second cylindrical portion of the throttling fitting has a second outer flange portion that protrudes outward from one end in the axial direction, and the tapered portion provided on at least one of the first cylindrical portion and the second cylindrical portion gradually decreases in diameter in the axial direction toward the first outer flange portion and the second outer flange portion, and a crimping fitting is provided to crimp and fix the first outer flange portion and the second outer flange portion which are superimposed on each other in a contact state, (vi) A fluid-filled vibration isolation device provided with a pressure-receiving chamber in which part of the wall is composed of the main body's rubber elastic material and a balance chamber in which part of the wall is composed of a flexible membrane, an incompressible fluid sealed in the pressure-receiving chamber and the balance chamber, and an orifice passage connecting the pressure-receiving chamber and the balance chamber to each other, wherein the throttling fitting is a diaphragm outer fitting fixed to the outer peripheral end of the flexible membrane, as described in (i) to (v), (vii) The vibration isolation device according to (vi), wherein the lower end of the first cylindrical portion of the main body rubber outer member is provided with a first inner flange portion that protrudes inward, and the lower end of the second cylindrical portion of the throttling fitting is provided with a second inner flange portion that protrudes inward, and the first inner flange portion and the second inner flange portion are separated from each other in the vertical direction and facing each other, and a partition member that separates the pressure receiving chamber and the equilibrium chamber is sandwiched between the opposing first inner flange portion and the second inner flange portion, (viii) A method for manufacturing a vibration damping device having a structure in which a first mounting member and a second mounting member are connected by a main body rubber elastic body, comprising the steps of: preparing a main body rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main body rubber elastic body, and a diaphragm fitting having a second cylindrical portion attached to the first cylindrical portion of the main body rubber outer member in an externally fitted state; inserting the first cylindrical portion into the second cylindrical portion and assembling the diaphragm fitting to the main body rubber outer member; and tapering the second cylindrical portion in the overlapping portion with the first cylindrical portion of the second cylindrical portion to form a tapered portion in the second cylindrical portion that has a smaller diameter in the direction of exit opposite to the direction of insertion of the first cylindrical portion into the second cylindrical portion, and fitting and fixing the tapered portion to the outer peripheral surface of the first cylindrical portion to position the main body rubber outer member and the diaphragm fitting relative to each other in the axial direction, This includes inventions relating to the present invention. In the invention described in (i) above, when the aperture fitting is fitted and fixed to the main rubber outer member by the diameter reduction process, the tapered portion provided on the first cylindrical part of the main rubber outer member and the tapered portion provided on the second cylindrical part of the aperture fitting are fitted together, so that the force that reduces the diameter of the aperture fitting is transmitted to the main rubber outer member as a component force in the direction of insertion into the aperture fitting. Therefore, the main rubber outer member is prevented from coming out in the opposite direction to the insertion direction into the aperture fitting, and the relative positional displacement of the main rubber outer member with respect to the aperture fitting can be suppressed. In the invention described in (ii) above, a tapered portion is provided throughout the first cylindrical portion located on the inner circumference of the second cylindrical portion, which facilitates alignment between the tapered portion of the first cylindrical portion and the tapered portion of the second cylindrical portion, allowing the tapered portions to be fitted together more securely. In the invention described in (iii) above, the tapered portion of the first cylindrical part and the tapered portion of the second cylindrical part are pressed against each other via a sealing rubber, thereby allowing the axial component force to be applied more efficiently to the main rubber outer member. In addition, the overlapping surfaces of the tapered portions can be sealed with the sealing rubber. In the invention described in (iv) above, when attaching the aperture fitting to the main rubber outer member by reducing its diameter, the tapered portion provided on the first cylindrical part of the main rubber outer member and the tapered portion provided on the second cylindrical part of the aperture fitting are fitted together, so that the force that reduces the diameter of the aperture fitting is transmitted to the main rubber outer member as a component force in the direction of insertion into the aperture fitting. Therefore, the main rubber outer member is prevented from coming out in the opposite direction to the insertion direction into the aperture fitting, and the relative positional displacement of the main rubber outer member with respect to the aperture fitting can be suppressed. In the invention described in (v) above, the relative axial positional displacement between the main rubber outer member and the throttling fitting is prevented in the insertion direction of the first cylindrical portion into the second cylindrical portion by the contact between the first outer flange portion and the second outer flange portion. Therefore, the relative axial positional displacement between the main rubber outer member and the throttling fitting is suppressed in the withdrawal direction of the first cylindrical portion from the second cylindrical portion by the fitting of the tapered portion of the first cylindrical portion and the tapered portion of the second cylindrical portion, thereby enabling the main rubber outer member and the throttling fitting to be positioned on both sides in the axial direction. Furthermore, the main rubber outer member and the throttling fitting can be more firmly positioned in the axial direction by crimping and fixing the first outer flange portion and the second outer flange portion in contact with each other using a crimping fitting. In the invention described in (vi) above, a fluid-filled vibration isolation device is provided with an incompressible fluid sealed inside. From the viewpoint of preventing fluid leakage, for example, it is important that the main rubber outer member and the diaphragm outer fitting are positioned in an appropriate relative position in the axial direction. Therefore, in a fluid-filled vibration isolation device, by employing axial positioning of the main rubber outer member and the diaphragm outer fitting through the fitting of a tapered portion, problems such as leakage of the sealed fluid can be prevented. In the invention described in (vii) above, the main body rubber outer member having a first inner flange portion and the diaphragm outer fitting having a second inner flange portion are positioned in an appropriate axial position by fitting the tapered portion, so that the partition member is properly sandwiched between the first inner flange portion and the second inner flange portion, preventing unintended short circuits of the sealed fluid between the pressure receiving chamber and the equilibrium chamber, and preventing the generation of abnormal noise due to rattling of the partition member. In the invention described in (viii) above, when the second cylindrical portion is fitted and fixed to the first cylindrical portion by reducing the diameter of the aperture fitting, the second cylindrical portion is tapered in diameter so that a tapered portion is formed, and the tapered portion of the second cylindrical portion is fitted and fixed to the outer surface of the first cylindrical portion, thereby preventing the main rubber outer member from coming off the aperture fitting and allowing the main rubber outer member and the aperture fitting to be positioned relative to each other in the axial direction. [Explanation of Symbols]

[0079] 10. Engine mount (vibration damping device, first embodiment) 12 Mount body 14 Outer bracket (crimping hardware) 16 First mounting member 18 Second mounting member 20 Main body rubber elastic body 22 First one-piece vulcanized molded product 24 Stopper section 26 Fixing part 28 Threaded section 30 screw holes 32 stud bolts 34 Main body rubber outer component 36 First cylindrical part 38 First outer flange portion 40 First inner flange portion 42 First tapered section (tapered section of the first cylindrical part) 44 Stopper rubber 46. ​​Recess 48 Flexible membrane 50 Diaphragm outer fitting (adjustment fitting) 52 Second one-piece vulcanized molded product 54 Second cylindrical part 56 Second outer flange portion 58 Second inner flange section 60 Expanding section 62 Seal rubber 64 Seal Lip 66 Second tapered section (tapered section of the second cylindrical part) 68 Fluid chamber 70 Partition Members 72 Partition Member Body 74 Lid member 76 Containment Depression 78 Circumferential groove 80 Fixing pins 82 Movable membrane 84 Pressure-receiving chamber 86 Equilibrium chamber 88 Orifice Passage 90 First communication hole 92 Second communication hole 94 First through-hole 96 Second perforation 98 Stopper fittings 100 Connecting member 102 Stopper receiving part 104 Step section 106 crimping pieces 108 Connecting bolts 110 Connecting flange 112 Crimping receiving surface 120 Mount body (second embodiment) 122 Second mounting member 124 Main body rubber outer component 126 First cylindrical part 128 Seal rubber 130 sealing rubber

Claims

1. A vibration isolation device in which a first mounting member and a second mounting member are connected by a main body rubber elastic body, The second mounting member comprises a main body rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main body rubber elastic body, and a throttling fitting having a second cylindrical portion attached to the first cylindrical portion of the main body rubber outer member in an externally fitted state. The first cylindrical portion of the main body rubber outer member is inserted axially into the second cylindrical portion of the throttling fitting, and the second cylindrical portion is fitted to the outer surface of the first cylindrical portion by diameter reduction processing. The fitting portions of the first and second cylindrical parts each have a tapered portion that becomes smaller in diameter in the direction of removal opposite to the direction of insertion of the first cylindrical part into the second cylindrical part. A vibration isolation device in which the tapered portion is provided along the entire axial direction of the first cylindrical portion.

2. The vibration isolation device according to claim 1, wherein a sealing rubber is interposed between the overlapping surfaces of the tapered portions.

3. A vibration isolation device in which a first mounting member and a second mounting member are connected by a main body rubber elastic body, The second mounting member comprises a main body rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main body rubber elastic body, and a throttling fitting having a second cylindrical portion attached to the first cylindrical portion of the main body rubber outer member in an externally fitted state. The first cylindrical portion of the main body rubber outer member is inserted axially into the second cylindrical portion of the restrictor fitting, and a sealing rubber is interposed between the first cylindrical portion and the second cylindrical portion. The second cylindrical portion is pressed against the sealing rubber by a diameter reduction process and fitted to the outer surface of the first cylindrical portion. The vibration isolation device has a tapered portion in the second cylindrical portion that contacts the sealing rubber, with the tapered portion having a smaller diameter in the direction of withdrawal opposite to the direction of insertion of the first cylindrical portion into the second cylindrical portion.

4. The first cylindrical portion of the main body rubber outer member is provided with a first outer flange portion that protrudes outward from one end in the axial direction, The second cylindrical portion of the aforementioned throttling fitting is provided with a second outer flange portion that protrudes outward from one end in the axial direction, The tapered portion provided in at least one of the first cylindrical portion and the second cylindrical portion has a gradually decreasing diameter in the axial direction toward the first outer flange portion and the second outer flange portion. A vibration isolation device according to any one of claims 1 to 3, wherein a crimping fitting is provided for crimping and fixing the first outer flange portion and the second outer flange portion which are superimposed on each other in a contact state.

5. The fluid-filled vibration isolation device is provided with a pressure-receiving chamber, the wall portion of which is made of the main body's rubber elastic material, and a balance chamber, the wall portion of which is made of a flexible membrane, both of which are filled with an incompressible fluid, and an orifice passage that connects the pressure-receiving chamber and the balance chamber to each other. The vibration isolation device according to any one of claims 1 to 3, wherein the diaphragm fitting is a diaphragm outer fitting fixed to the outer peripheral end of the flexible membrane.

6. The lower end of the first cylindrical portion of the main body rubber outer member is provided with a first inner flange portion that protrudes inward, The lower end of the second cylindrical portion of the aforementioned throttling fitting is provided with a second inner flange portion that protrudes inward, The vibration isolation device according to claim 5, wherein the first inner flange portion and the second inner flange portion are separated from each other in the vertical direction and face each other, and a partition member that separates the pressure receiving chamber and the equilibrium chamber is sandwiched between the facing first inner flange portion and the second inner flange portion.

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