JP5377280B2 - Fluid filled active vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid-sealed active vibration control device with a new structure which makes excellent both mounting workability and mounting strength with respect to a second mounting member of a rubber stopper, which has a simple structure of a small number of components. <P>SOLUTION: In a fluid-sealed active vibration control device 10, a locking hole 166 and engaging hole 168 are formed in an abutting part 52 which is a mounting object of a shock absorbing rubber 150 while a locking protrusion 158 and engaging protrusion 160 are integrally formed with a shock absorbing rubber 150 constituting a stopper mechanism 148 (a). A locking mechanism 170 for preventing the locking protrusion 158 from being pulled out of the locking hole 166 is constituted by engaging the engaging protrusion 162 projecting above the outer peripheral surface in a tip of the locking protrusion 158 with the peripheral edge of the locking hole 166 (b). A holding mechanism 172 for keeping the engaging protrusion 162 and the peripheral edge of the locking hole 166 in the engagement state is formed by inserting the engaging protrusion 160 into the engaging hole 168 to prevent the rotation of the locking protrusion 158 (c). <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a fluid filled type vibration isolator applied to an engine mount or the like of an automobile, and more particularly, a fluid filled type active type in which an active vibration isolating effect is exhibited by applying a vibration force from the outside. The present invention relates to a vibration isolator.

  2. Description of the Related Art Conventionally, a vibration isolator that is interposed between members constituting a vibration transmission system and that anti-vibrates and connects these members is known. Devices have also been proposed. Furthermore, for the purpose of further improving the performance of the fluid-filled vibration isolator, an active vibration isolation effect is exhibited by controlling the pressure in the pressure receiving chamber by applying an external excitation force using an electromagnetic actuator. A fluid-filled active vibration isolator is also proposed, and its application to an automobile engine mount or the like is being studied.

  By the way, in a general fluid-filled active vibration isolator, a pressure receiving chamber and an equilibrium chamber are provided in series in the axial direction, and a main body portion including the pressure receiving chamber and the equilibrium chamber is removed outward in the axial direction. An electromagnetic actuator is disposed at the position. When such a structure is adopted, since the pressure receiving chamber, the equilibrium chamber, and the electromagnetic actuator are all arranged in series in the axial direction, an increase in the size of the device in the axial direction becomes a problem. As one means for suppressing such an increase in size in the axial direction, the applicant of the present application disclosed in Japanese Patent Application Laid-Open No. 2006-275273 (Patent Document 1) and the like so as to surround the periphery of the main rubber elastic body. A structure in which an equilibrium chamber is formed by using a space on the outer peripheral side of the main rubber elastic body by arranging a film is proposed.

  However, in such a structure in which a flexible film is provided around the main rubber elastic body, there is a problem of interference between the flexible film and other members when a heavy load is input. That is, when a shocking heavy load is input between the first mounting member and the second mounting member, for example, when the automobile climbs over a level difference, the first mounting member and the second mounting member are relative to each other. Therefore, the approach displacement and the separation displacement are repeated greatly. As a result, the power unit side member attached to the first attachment member may come into contact with the flexible membrane when the first attachment member and the second attachment member are approached, and the flexible membrane may be damaged. It was.

  Therefore, as shown in Patent Document 1, a bounce stopper mechanism that limits the relative displacement in the approaching direction of the first mounting member and the second mounting member in a buffering manner is generally employed. Yes. That is, the stopper mechanism has, for example, a contact portion provided on each of the first mounting member side and the second mounting member side, and is disposed so as to face each other. Is provided. When a large load is input, the abutting portions are abutted in a shock-absorbing manner via a cushion rubber, so that the approach displacement between the first mounting member and the second mounting member is limited.

  However, in the case where such a stopper mechanism is provided, there is a problem with the method of attaching the buffer rubber to the contact portion. That is, since the shock absorbing rubber is required to have characteristics different from those of the main rubber elastic body and the flexible film, the shock absorbing rubber is generally formed separately from the main rubber elastic body and the flexible film and is formed at the contact portion. It will be retrofitted. As this fixing method, a method in which the buffer rubber is vulcanized and bonded to the support metal and the support metal is fixed to the contact portion by means such as welding or bolt fixing. However, this method requires a special support metal fitting, and requires treatment such as coating for vulcanizing and bonding the buffer rubber to the support metal fitting, which increases the number of parts and processes. There was a problem. In addition, it is possible to attach a separate cushioning rubber directly to the abutting part without using a support bracket, but the cushioning rubber may fall off due to the action of the stopper load, and the stopper effect is highly reliable. It was difficult to make it stable.

JP 2006-275273 A

  The present invention has been made in the background of the above-mentioned circumstances, and the solution to the problem is a fluid with a novel structure capable of improving both the mounting workability and the mounting strength with respect to the contact portion of the buffer rubber. An object of the present invention is to provide an encapsulated active vibration isolator with a simple structure with a small number of parts.

  That is, according to the first aspect of the present invention, the first mounting member and the second mounting member are connected by the main rubber elastic body, and one opening of the second mounting member is connected by the main rubber elastic body. While being closed, the other opening of the second mounting member is closed by a vibration member, a pressure receiving chamber is formed between the rubber elastic body of the main body and the vibration member, and the main body The outer side of the rubber elastic body is covered with a flexible membrane to form an equilibrium chamber. The pressure receiving chamber and the equilibrium chamber are filled with an incompressible fluid, and the pressure receiving chamber and the equilibrium chamber communicate with each other. In the fluid-filled active vibration isolator provided with an electromagnetic actuator that applies a vibration force to the vibration member while the orifice passage is formed, the first mounting member and the second mounting member The abutment portions provided on the At least one stopper mechanism is configured to buffer the relative displacement amount in the approaching direction of the first mounting member and the second mounting member by attaching a buffer rubber to at least one corresponding contact portion. The locking rubber and the locking protrusion are integrally formed on the buffer rubber, and the locking hole into which the locking protrusion is inserted in the contact portion to which the buffer rubber is attached and the locking A locking hole into which the locking protrusion is inserted is formed, the locking hole has a different shape with a different inner diameter in the circumferential direction, and the tip of the locking protrusion that passes through the locking hole And mounting the buffer rubber around the central axis of the locking projection to the corresponding contact portion in the inserted state of the locking projection into the locking hole. The locking hole by rotating to the position A lock mechanism is provided that locks the engagement protrusion with respect to the peripheral edge to prevent the lock protrusion from being pulled out of the lock hole, and the buffer rubber is attached to the corresponding contact portion. When the locking projection is inserted into the locking hole, the buffer rubber is prevented from rotating, and the locking mechanism is prevented from being pulled out of the locking hole. It is characterized in that a lock holding mechanism that holds the state is configured.

  According to the first aspect, by attaching a shock-absorbing rubber separate from the main rubber elastic body and flexible film to the contact portion, excellent load resistance different from those of the main rubber elastic body and flexible film It is possible to easily realize a shock absorbing rubber having characteristics such as properties.

  Furthermore, the shock absorbing rubber is held in a desired mounting state with respect to the abutting portion by a locking mechanism that uses the engagement between the engaging protrusion of the locking protrusion and the peripheral edge of the locking hole. Yes. Moreover, in the lock mechanism, after the locking protrusion is inserted into the locking hole, the shock absorbing rubber is fixed to the abutting portion by an extremely simple operation of rotating the shock absorbing rubber around the central axis of the locking protrusion. It can be held.

  Furthermore, the lock holding mechanism using insertion locking of the locking projection into the locking hole prevents the cushion rubber from rotating around the central axis of the locking projection with respect to the contact portion. Thus, the locking mechanism is prevented from releasing the engagement protrusion, and the mounting state of the buffer rubber with respect to the contact portion is stably maintained.

  According to a second aspect of the present invention, in the fluid-filled active vibration isolator described in the first aspect, the shock-absorbing rubber has a longitudinal shape, and the shock-absorbing rubber has the one end in the longitudinal direction. A locking projection is formed, and the locking projection is formed at the other end in the longitudinal direction of the cushioning rubber.

  According to the second aspect, since the locking projection and the locking projection are arranged at a large distance in the substantially longitudinal direction of the buffer rubber, the buffer rubber rotates around the central axis of the lock projection. This can be effectively prevented by locking the locking projections with the locking holes.

  In addition, with respect to both ends in the longitudinal direction of the buffer rubber, the protrusions inserted into the holes provided in the respective contact portions are formed, so that the displacement of the buffer rubber and unnecessary deformation are limited, The target mounting state is maintained.

According to a third aspect of the present invention, in the fluid-filled active vibration isolator described in the first or second aspect, the shock absorbing rubber has a longitudinal shape, and one end of the shock absorbing rubber in the longitudinal direction is provided. The locking protrusion is formed on the side of the portion and is inserted into the locking hole of the abutting portion. On the other hand, in the buffer rubber , from the locking protrusion to the other end in the longitudinal direction of the buffer rubber the remote position, the engagement and the engaging portion positioned on stop projection and the outer peripheral edge portion is integrally formed, engaging projection is inserted into the locking hole of the abutting portion together, in which該掛stop portion is hooked to the edge of the contact portion.

  According to the third aspect, the locking protrusion is prevented from coming off from the locking hole by the latching of the latching portion to the contact portion. Therefore, the function of holding the locking state of the engaging protrusion in the lock holding mechanism is more reliably exhibited, and the buffer rubber is effectively prevented from falling off from the contact portion.

  According to a fourth aspect of the present invention, in the fluid-filled active vibration isolator described in any one of the first to third aspects, the protrusion height of the buffer rubber from the contact portion is the lock. The portion where the projection is formed is smaller than the other portion.

  According to the fourth aspect, it is possible to prevent the stopper load that acts on the shock absorbing rubber by being sandwiched between the contact portions from being directly applied to the lock rubber protruding portion of the shock absorbing rubber. Thus, the durability of the locking projection is ensured, and the locking projection is prevented from coming off from the locking hole.

  According to a fifth aspect of the present invention, in the fluid-filled active vibration isolator described in any one of the first to fourth aspects, the locking protrusion in the buffer rubber constitutes the stopper mechanism. And projecting from the back surface side of the cushioning rubber toward the opposite side in the opposing direction of the two contact portions.

  According to the fifth aspect, since the stopper load acts on the buffer rubber in the direction of the central axis of the locking projection, deformation of the locking projection due to the stopper load is suppressed, and durability is improved. At the same time, the locking projection is prevented from coming off from the locking hole due to the stopper load.

  According to the present invention, the independent cushioning rubber can be easily fixed to the abutting portion by the locking mechanism that engages the engaging protrusion of the locking protrusion and the peripheral edge of the locking hole. In addition, the engaging protrusion and the peripheral edge of the locking hole are locked by inserting the locking protrusion into the locking hole and preventing the buffer rubber from rotating around the central axis of the locking protrusion. The mounting state of the buffer rubber to the contact portion can be stably maintained.

It is a longitudinal cross-sectional view which shows the engine mount as one Embodiment of this invention, Comprising: The figure corresponded in the III-III cross section of FIG. The front view of the engine mount shown by FIG. The top view of the engine mount shown by FIG. The perspective view of the rubber stopper which comprises the engine mount shown by FIG. FIG. 5 is a perspective view of the shock absorbing rubber shown in FIG. 4. The right view of the shock absorbing rubber shown by FIG. The bottom view of the shock absorbing rubber shown by FIG. The top view which shows the engine mount before mounting | wearing with the shock absorbing rubber shown by FIG. FIGS. 5A and 5B are bottom views schematically showing a mounting method of the shock-absorbing rubber shown in FIG. 4, where FIG. (C) shows the mounting state of the buffer rubber, respectively. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount shown by FIG. The right view of the shock absorbing rubber employ | adopted as the engine mount as another one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIGS. 1 to 3 show an automobile engine mount 10 as an embodiment of the present invention relating to a fluid-filled active vibration isolator. The engine mount 10 has a structure in which a first mounting member 12 and a second mounting member 14 are elastically connected by a main rubber elastic body 16, and the first mounting member 12 is an automobile not shown. While being attached to the power unit, the second attachment member 14 is attached to an automobile body (not shown), so that the power unit is supported in an anti-vibration manner with respect to the body. Further, under such a mounting state, between the first mounting member 12 and the second mounting member 14, the shared load of the power unit and the main vibration to be damped are both substantially the axis of the engine mount 10. It is input in the direction (vertical direction in FIG. 1). In the following description, in principle, the vertical direction refers to the vertical direction in FIG.

  More specifically, the flexible membrane inner fitting 20 is fitted and fixed to the first attachment member 12, and the second attachment member 14 is constituted by the main rubber outer barrel fitting 22 and the flexible membrane outer barrel fitting 24. It is configured. The first mounting member 12 and the main rubber outer cylinder fitting 22 are vulcanized and bonded to the main rubber elastic body 16, whereby the first integral vulcanized molded product 28 is formed. The membrane inner metal fitting 20 and the flexible membrane outer cylinder fitting 24 are vulcanized and bonded to the flexible membrane 30 to form a second integral vulcanized molded product 32. Two integrally vulcanized molded products 28 and 32 are combined with each other.

  The first mounting member 12 constituting the first integrally vulcanized molded product 28 has a generally circular block shape as a whole, and has a substantially cylindrical shape with an upper portion extending in the axial direction, and a lower portion facing downward. The shape is a truncated cone having an opposite direction and gradually decreasing in diameter. Further, the first mounting member 12 is integrally formed with a mounting plate portion 34 projecting upward, and a bolt insertion hole 36 is provided in the central portion of the mounting plate portion 34. In addition, an inner bracket 38 is superimposed on one surface of the mounting plate portion 34 and fixed by a fixing bolt 40 inserted through the bolt insertion hole 36. The inner bracket 38 is superimposed on the upper surface of the first mounting member 12 and extends laterally from the mounting plate 34 toward one side in the direction perpendicular to the axis. The first attachment member 12 is fixedly attached to a power unit of an automobile (not shown) via the inner bracket 38.

  The main rubber outer cylinder fitting 22 includes a cylindrical wall portion 42 having a substantially large-diameter cylindrical shape, and a flange-like portion 44 that extends radially outward is integrally formed at the lower end in the axial direction of the cylindrical wall portion 42. On the other hand, the upper end portion in the axial direction of the cylindrical wall portion 42 is a tapered cylindrical portion 46 that gradually expands as it goes upward in the axial direction. Thus, a circumferential groove 48 is formed on the outer peripheral side of the main rubber outer tube fitting 22 so as to open to the outer peripheral surface and extend in the circumferential direction with a length of a little less than one round. And the 1st attachment member 12 is spaced apart and arrange | positioned on the substantially same center axis | shaft apart from the main body rubber outer cylinder metal fitting 22, The outer peripheral surface of the reverse taper shape in the 1st attachment member 12, and a main body rubber outer cylinder The inner peripheral surface of the tapered cylindrical portion 46 in the metal fitting 22 is spaced from and opposed to each other, and the main rubber elastic body 16 is between the opposed surfaces of the first mounting member 12 and the main rubber outer cylindrical metal fitting 22. It is elastically connected by.

  The main rubber elastic body 16 as a whole has a large-diameter frustoconical shape, and the first mounting member 12 is coaxially arranged and vulcanized and bonded to the central portion thereof. The tapered tubular portion 46 of the main rubber outer tubular fitting 22 is overlapped and vulcanized and bonded to the outer peripheral surface of the large-diameter side end portion. As a result, the main rubber elastic body 16 is formed as a first integral vulcanized molded article 28 including the first mounting member 12 and the main rubber outer tube fitting 22 as described above. In the first integral vulcanization molded product 28, the upper opening of the main rubber outer cylinder fitting 22 is closed by the main rubber elastic body 16.

  On the other hand, the flexible membrane inner metal fitting 20 constituting the second integrally vulcanized molded product 32 has a thin cylindrical shape with a small diameter. In addition, flanges projecting outward are integrally formed on the upper and lower ends in the axial direction of the cylindrical wall portion of the flexible membrane inner metal fitting 20, and the flexible membrane inner metal fitting 20 is open to the outer circumferential surface. It has a groove-like cross section.

  The flexible outer membrane fitting 24 has a thin-walled large-diameter cylindrical shape, and a support flange 50 that extends radially outward is integrally formed in the axially upper opening. Yes. The support flange 50 includes a support plate portion 52 that extends in one radial direction (rightward in FIGS. 1 to 3), and has a hanging wall shape that extends downward from the protruding tip of the support plate portion 52. The retaining wall portion 54 is integrally provided. Furthermore, an annular plate-shaped flange-shaped portion 56 that extends outward in the radial direction is integrally formed in the opening on the lower side in the axial direction of the flexible membrane outer tube fitting 24, and further, the flange-shaped An annular caulking piece 58 that projects downward in the axial direction is integrally formed on the outer peripheral edge of the portion 56.

  A flexible membrane inner fitting 20 is disposed on substantially the same central axis so as to be spaced apart upward in the axial direction of the flexible membrane outer tube fitting 24. The flexible membrane outer tube fitting 24 is connected by the flexible membrane 30.

  The flexible film 30 is formed of a thin rubber film and has a substantially annular shape extending in the circumferential direction with a curved cross-sectional shape having a large slack so that elastic deformation can be easily allowed. In addition, the flexible film 30 has a concave shape in which a part of the circumference is concave on the outer peripheral side, and is shaped so as to avoid a component part of a stopper mechanism 148 described later. Interference is avoided. Further, the concave portion of the flexible film 30 has a central portion that is thicker than the other portions, and has an adhesion prevention protrusion 59 that protrudes toward the inner peripheral side. The inner peripheral edge of the flexible film 30 is vulcanized and bonded to the outer peripheral surface of the cylindrical wall portion of the flexible film inner metal fitting 20, and the outer peripheral edge of the flexible film 30 is acceptable. The flexible film outer cylinder fitting 24 is vulcanized and bonded to the opening on the upper side in the axial direction. As a result, the flexible membrane 30 is formed as a second integral vulcanized molded product 32 including the flexible membrane inner fitting 20 and the flexible membrane outer tube fitting 24.

  Thus, the second integral vulcanized molded product 32 is assembled on the first integral vulcanized molded product 28 from above, and the flexible membrane inner metal fitting 20 is the first. While being fitted to one mounting member 12, a flexible membrane outer tubular fitting 24 is fitted to the main rubber outer tubular fitting 22. Further, the flexible film 30 is disposed so as to be spaced outward from the main rubber elastic body 16 so as to cover the entire outer peripheral surface of the main rubber elastic body 16.

  That is, the flexible membrane inner metal fitting 20 and the first attachment member 12 are externally fitted to the first attachment member 12 via a seal rubber integrally formed with the main rubber elastic body 16. The members 12 are coaxially positioned and fixed to each other.

  On the other hand, the flexible membrane outer tube fitting 24 is externally attached to the main rubber outer tube fitting 22 from above in the axial direction. Further, the outer peripheral edge of the flange-like portion 44 is overlapped in the axial direction with respect to the flange-like portion 56 of the flexible membrane outer tubular fitting 24 at the lower end of the main rubber outer tubular fitting 22 and the upper end thereof. The opening end edge of the tapered tubular portion 46 is overlapped with the inner peripheral surface of the flexible membrane outer tubular fitting 24 in the radial direction.

  Then, the caulking piece 58 of the flexible membrane outer cylinder fitting 24 is caulked and fixed to the outer peripheral edge of the flange-like portion 44 of the main rubber outer barrel fitting 22, whereby the main rubber outer cylinder fitting 22 and the flexible membrane are fixed. The outer cylinder fitting 24 is fixed to each other and assembled. It should be noted that seal rubber integrally formed with the main rubber elastic body 16 or the flexible film 30 is interposed in the overlapping portions of the main rubber outer cylinder fitting 22 with the flexible membrane outer cylinder fitting 24 at both upper and lower ends. And is fluid tightly sealed. As a result, the circumferential groove 48 formed in the main rubber outer tube fitting 22 is fluid-tightly covered with the flexible membrane outer tube fitting 24, so that the cylindrical wall portion 42 of the main rubber outer tube fitting 22 and the flexible membrane are covered. An annular passage 60 is formed between the radially opposed surfaces of the outer cylindrical fitting 24 so as to extend continuously in a circumferential direction with a predetermined length or over the entire circumference.

  Further, a partition plate fitting 62 and a support member 64 are assembled to the lower opening of the main rubber outer cylinder fitting 22. The support member 64 has a vibration member 68 vulcanized and bonded to the center portion of the elastic rubber body 66 having a substantially annular plate shape, and an annular holding fitting 70 is vulcanized and bonded to the outer peripheral portion thereof. The vibrating member 68 and the annular holding metal fitting 70 are elastically connected by a support rubber elastic body 66.

  The vibration member 68 has a disk shape, and an annular connecting portion 72 that protrudes upward is integrally formed on the outer peripheral edge thereof. A driving shaft 74 extending downward is integrally formed at the central portion of the vibration member 68. Moreover, the front-end | tip part (lower end side in FIG. 1) of the drive shaft 74 is made into the external thread part 76, and the thread groove is engraved.

  On the other hand, the annular holding metal fitting 70 is integrally formed with a mounting plate portion 80 and a positioning projection 82 that extend in a flange shape with respect to the upper and lower openings of the cylindrical portion 78 having a cylindrical shape. An annular press-fit portion 84 that protrudes further downward is integrally formed at the peripheral portion.

  A vibrating member 68 is disposed on substantially the same central axis so as to be spaced inward in the radial direction of the annular holding metal fitting 70, and spreads between the radially opposing surfaces of the annular holding metal piece 70 and the vibrating member 68. Thus, the supporting rubber elastic body 66 is disposed. The supporting rubber elastic body 66 is vulcanized and bonded to the opposing surfaces of the annular connecting portion 72 of the vibrating member 68 and the cylindrical portion 78 of the annular holding metal fitting 70 at the inner and outer peripheral edges thereof. A space between the member 68 and the annular holding metal fitting 70 is fluid-tightly closed by a support rubber elastic body 66.

  On the other hand, the partition plate fitting 62 has a thin disk shape, and the outer diameter dimension thereof is a size that reaches the middle portion in the radial direction of the mounting plate portion 80 in the annular holding fitting 70. The central portion of the partition plate fitting 62 protrudes upward in a substantially plateau shape, and an orifice through hole 86 is provided on the central axis thereof. Further, a plurality of locking pieces 88 project upward from the circumference located near the outer peripheral edge of the partition plate fitting 62.

  The partition plate fitting 62 is aligned in the direction perpendicular to the axis by the locking piece 88, and the flange shape of the main rubber outer tube fitting 22 assembled thereto at the lower opening of the flexible membrane outer tube fitting 24. The outer peripheral edge portion is superimposed on the portion 44 and assembled. Further, a support member 64 is assembled to the lower opening of the flexible membrane outer tube fitting 24 from below the partition plate fitting 62, and the mounting plate portion 80 of the annular holding fitting 70 in the support member 64 is attached to the main body. The rubber outer cylinder fitting 22 and the partition plate fitting 62 are superposed on each other and their outer peripheral edge portions are fixed by caulking pieces 58 of the flexible membrane outer cylinder fitting 24. The first integral vulcanized molded product 28, the second integral vulcanized molded product 32, the partition plate fitting 62, and the support member 64 constitute a mount body 90.

  As a result, the lower opening of the flexible membrane outer tube fitting 24 is fluid-tightly covered with the support member 64, so that the non-compressed space is provided between the opposing surfaces of the main rubber elastic body 16 and the support member 64. A pressure receiving chamber 92 in which a sexual fluid is enclosed is formed. In this pressure receiving chamber 92, a part of the wall portion is constituted by the main rubber elastic body 16, and the elasticity of the main rubber elastic body 16 is applied when vibration is input between the first mounting member 12 and the second mounting member 14. Based on the deformation, a vibration is input to cause a pressure fluctuation.

  In addition, the pressure receiving chamber 92 is provided with a partition plate fitting 62. The pressure receiving chamber 92 sandwiches the partition plate fitting 62, and the vibration input chamber 94 on the main rubber elastic body 16 side and the support member 64 side. The vibration input chamber 94 and the vibration chamber 96 are communicated with each other through an orifice through-hole 86.

  Furthermore, the main rubber elastic body 16 and the flexible membrane 30 are fixed to the first mounting member 12 and the second mounting member 14 at the inner peripheral edge and the outer peripheral edge, respectively, so that the main rubber elastic body Between the opposing surfaces of 16 and the flexible membrane 30, an equilibrium chamber 98 in which an incompressible fluid is sealed is formed. That is, the balance chamber 98 is configured by the flexible membrane 30 with a part of the wall portion being easily deformable, and the volume change is easily allowed based on the elastic deformation of the flexible membrane 30. ing. The incompressible fluid enclosed in the pressure receiving chamber 92 and the equilibrium chamber 98 is a vibration required for the automobile engine mount 10 to have a vibration isolation effect based on a resonance action of a fluid that flows through an orifice passage 104 described later. In order to obtain efficiently in the frequency range, generally 0.1 Pa. A low-viscosity fluid of s or less is preferably employed.

  Furthermore, an annular passage 60 is formed using the second attachment member 14, and one end portion in the circumferential direction of the annular passage 60 is communicated with the pressure receiving chamber 92 through the first communication hole 100, The other circumferential end of the annular passage 60 is communicated with the equilibrium chamber 98 through a second communication hole 102 formed in the main rubber elastic body 16. Thus, an orifice passage 104 that allows the pressure receiving chamber 92 and the equilibrium chamber 98 to communicate with each other to allow fluid flow between the chambers 92 and 98 is formed around the pressure receiving chamber 92 with a predetermined length. The orifice passage 104 has an anti-vibration effect based on a resonance action of a fluid flowing inside based on a pressure difference caused between the pressure receiving chamber 92 and the equilibrium chamber 98 when vibration is input. The passage cross-sectional area and the passage length are appropriately set and tuned so as to be effectively exhibited in the low frequency region. Further, the opening on the equilibrium chamber 98 side of the orifice passage 104 is stably maintained at all times by preventing the main rubber elastic body 16 and the flexible film 30 from being closely contacted by the contact prevention protrusion 59. ing.

  On the other hand, an electromagnetic actuator 108 is disposed on the opposite side of the pressure receiving chamber 92 with the support member 64 interposed therebetween. The electromagnetic actuator 108 is fixedly assembled with a coil 112 in a housed state in a substantially cup-shaped housing 110, and upper and lower yokes 114 and 116 made of an annular ferromagnetic material are disposed around the coil 112, respectively. Are fixedly assembled to form a magnetic path. A guide sleeve 118 is elastically positioned and mounted on the cylindrical inner peripheral surface of the upper yoke 114 forming the magnetic path, and a slider 120 made of a ferromagnetic material is disposed inside the guide sleeve 118. It is assembled slidably.

  The slider 120 is disposed in a region of a magnetic gap formed between the upper and lower yokes 114 and 116 that form a magnetic path, and a magnetic force is exerted by energizing the coil 112, which is guided by the guide sleeve 118. However, it is driven in the axial direction. Further, the slider 120 has a substantially cylindrical shape as a whole having a through-hole 122 penetrating in the axial direction, and is slidable with respect to the guide sleeve 118, while the upper portion in the axial direction of the through-hole 122. The abutting protrusion 124 is formed so as to protrude inward.

  The electromagnetic actuator 108 includes a flange 126 formed on the opening peripheral edge of the housing 110 so that the mounting plate 80 of the annular holding bracket 70 in the support member 64 is overlapped with the annular holding bracket 70 and the like. The second mounting member 14 is caulked and fixed at 58. Thereby, the electromagnetic actuator 108 is assembled so that the sliding central axis of the slider 120 substantially coincides with the central axes of the first and second mounting members 12 and 14.

  In addition, the drive shaft 74 of the vibration member 68 is inserted from above on the central axis of the electromagnetic actuator 108 assembled in this way, and this drive shaft 74 is inserted into the through hole 122 of the slider 120. It is inserted. A cylindrical nut-like fastening member 128 is screwed to the tip portion inserted into the contact protrusion 124 of the drive shaft 74, and the slider 120 cannot be removed from the drive shaft 74 by the fastening member 128. It is supported.

  In addition, a coil spring 130 is extrapolated on the drive shaft 74 and is disposed across the opposing surfaces of the vibration member 68 and the contact protrusion 124 of the slider 120. In other words, the fastening member 128 is screwed into the drive shaft 74 and the coil spring 130 is compressed with the vibration member 68 via the abutment protrusion 124 of the slider 120, whereby the slider 120 is coil spring. 130 is urged from the drive shaft 74 in the extraction direction by 130 and is supported by the fastening member 128 so as not to be extracted. Thereby, the slider 120 is positioned in the axial direction with respect to the drive shaft 74. Thus, the slider 120 and the drive shaft 74 are connected in a substantially fixed state in the axial direction, and a driving force applied to the slider 120 by energization of the coil 112 is applied to the vibration member via the drive shaft 74. 68.

  Further, a through hole 134 is provided in the center of the bottom wall portion of the housing 110 of the electromagnetic actuator 108, and a lower yoke 116 that exerts a magnetic force by being opposed to the slider 120 through the through hole 134. It is exposed to the outside. The central portion of the lower yoke 116 is thickened in a mountain shape to form a central protrusion 136, and the central protrusion 136 enters the guide sleeve 118 from below.

  Further, a lid member 138 is fitted into the central hole of the lower yoke 116 that opens to the outside through the through hole 134 and is closed by the lid member 138. The lid member 138 has a substantially disc shape, and has a structure in which the upper surface of the metal plate is covered with a rubber layer over substantially the entire surface.

  The lower yoke 116 is magnetically connected to the housing 110 and the upper yoke 114, and forms an annular magnetic path extending around the coil 112 in cooperation with the housing 110 and the upper yoke 114. doing. In addition, a magnetic gap is formed in the magnetic path between the upper yoke 114 and the lower yoke 116 in the center hole of the coil 112, and a slider 120, which is an armature, is provided at a position corresponding to the magnetic gap. It is arranged. The slider 120 is positioned apart from the lower yoke 116 by a predetermined distance on the inner circumferential side of the upper yoke 114 with the guide sleeve 118 interposed therebetween.

  As a result, when the coil 112 wound in the circumferential direction is energized, a magnetic pole is formed between the opposing surfaces of the upper and lower yokes 114 and 116 forming a magnetic gap. A driving force in the direction that minimizes the magnetic resistance, that is, an axial driving force toward the lower yoke 116 is applied to the slider 120 disposed in the magnetic gap.

  The axial driving force exerted on the slider 120 is transmitted to the vibration member 68 via the driving shaft 74 positioned in the axial direction with respect to the slider 120. As a result, the vibration member 68 is reciprocally displaced in the axial direction, and a vibration force is exerted on the vibration chamber 96 in which a part of the wall portion is configured by the vibration member 68.

  Further, a cylindrical outer bracket 140 is extrapolated from the electromagnetic actuator 108 to the engine mount 10 having the above-described structure. The outer bracket 140 has a flange-shaped upper end opening portion together with the flange-shaped portion 44 of the main rubber outer tube bracket 22, the mounting plate portion 80 of the annular holding bracket 70, and the flange portion 126 of the housing 110. Caulking pieces 58 of the metal fitting 24 are fixed by caulking. A mounting plate portion 144 is formed at the lower end opening of the outer bracket 140, and a plurality of mounting holes 146 are formed in the mounting plate portion 144.

  Thus, although the engine mount 10 is not shown, the first attachment member 12 is attached to the power unit via the inner bracket 38 fixed to the attachment plate portion 34, while the second attachment member 14 is By being attached to the vehicle body with the mounting bolt via the outer bracket 140, it is attached between the power unit and the body.

  When a low-frequency large-amplitude vibration corresponding to an engine shake is input between the first mounting member 12 and the second mounting member 14 in such a vehicle mounted state of the engine mount 10, the pressure receiving chamber 92 is balanced. Based on the relative pressure difference between the chambers 98, fluid flow is induced between the chambers 92 and 98 through the orifice passage 104. As a result, an anti-vibration effect (vibration damping effect) based on a fluid action such as a resonance action of the fluid is exhibited.

  Further, in the engine mount 10, the generated force of the electromagnetic actuator 108 is applied to the excitation chamber 96 by the reciprocating displacement of the excitation member 68, and the excitation force applied to the excitation chamber 96 is the orifice. It is transmitted to the vibration input chamber 94 through the through hole 86. As a result, the pressure in the vibration input chamber 94 can be controlled, and an active or canceling vibration-proofing effect against the input vibration is exhibited, thereby further improving the vibration-proof performance. The excitation force exerted on the excitation chamber 96 is filtered by the orifice through-hole 86 and transmitted to the vibration input chamber 94, so that an excitation force having a frequency and phase corresponding to the input vibration is obtained. Is being applied with high accuracy.

  On the other hand, in the engine mount 10, when a shocking heavy load is input between the first mounting member 12 and the second mounting member 14 due to driving on a rough road or stepping over a step, the first mounting member. The relative approach displacement between the 12 and the second mounting member 14 is limited by the stopper mechanism 148. The stopper mechanism 148 is an inner portion in which a buffer rubber 150 attached to the support plate portion 52 of the flexible membrane outer tube fitting 24 is an abutting portion on the first attachment member 12 side that is opposed to the upper and lower sides in the axial direction. The bracket 38 and the support plate portion 52 that is a contact portion on the second attachment member 14 side are arranged to face each other.

  As shown in FIGS. 4 to 7, the buffer rubber 150 is entirely formed of a rubber elastic body, and as shown in FIGS. 4 to 7, a long plate-shaped stopper portion 152 that extends while being slightly curved, and a short portion of the stopper portion 152. An outer peripheral contact portion 153 that protrudes downward from one end portion in the hand direction is integrally provided. The outer peripheral contact portion 153 is formed in a portion from the intermediate portion to the end portion in the longitudinal direction of the stopper portion 152, and a position where one end portion in the longitudinal direction of the stopper portion 152 is out of the outer peripheral contact portion 153. Protruding. Further, the outer peripheral abutting portion 153 has a downward projecting dimension that changes in the middle in the longitudinal direction, and is stepped in the right side view shown in FIG. 6, and one side in the longitudinal direction is more than the other side. It is formed with small protruding dimensions.

  A hooking portion 154 is provided on the outer peripheral edge of the buffer rubber 150. The latching portion 154 is integrally formed at the lower end of a portion formed with a large projecting dimension in the outer peripheral contact portion 153 and extends in the longitudinal direction of the stopper portion 152 with a substantially constant hook-shaped cross section. Further, the latching portion 154 extends from the lower end of the outer peripheral abutting portion 153 in the direction perpendicular to the axis, and extends upward from the lateral wall portion 155 disposed opposite to the stopper portion 152 and the extending tip end portion of the lateral wall portion 155. It has a vertical wall portion 156 that protrudes toward the outer peripheral contact portion 153 and protrudes toward the outer periphery.

  In addition, a locking projection 158 and a locking projection 160 that protrude downward are integrally formed on the stopper portion 152 of the shock absorbing rubber 150. The locking protrusion 158 has a substantially cylindrical shape with a small diameter as a whole, and protrudes in the thickness direction of the stopper portion 152 at one end in the longitudinal direction of the buffer rubber 150. The locking protrusion 158 is formed at a portion of the stopper portion 152 of the shock absorbing rubber 150 that protrudes further outward in the longitudinal direction from the portion where the outer peripheral contact portion 153 is formed. Further, the latching portion 154 is formed on the opposite side of the stopper projection 152 that is spaced apart from the portion where the locking projection 158 is formed.

  In addition, an engaging protrusion 162 that protrudes on the outer peripheral surface is integrally formed at the protruding tip portion of the locking protrusion 158. The engagement protrusion 162 is a substantially rectangular block-shaped protrusion formed of a rubber elastic body, and sandwiches the locking protrusion 158 in a direction substantially orthogonal to the central axis l of the locking protrusion 158. A pair protruding toward both sides is provided. Further, a gap is formed between the pair of engaging protrusions 162 and 162 and the stopper portion 152, and the gap is set to be equal to or larger than the thickness dimension of the support plate portion 52.

  On the other hand, the locking projection 160 has a substantially cylindrical shape with a small diameter, and is formed so as to protrude toward the same side as the locking projection 158 in the thickness direction of the stopper portion 152. Further, one of the locking projections 160 is formed at the end opposite to the side on which the locking projection 158 is formed in the longitudinal direction of the buffer rubber 150 and at the substantially central portion in the longitudinal direction, respectively. Three projecting portions 158, 160, 160 projecting from the stopper portion 152 are separated from each other in the longitudinal direction of the buffer rubber 150.

  Further, a retaining portion 164 is integrally formed at the middle portion in the projecting direction of the locking projection 160. The retaining portion 164 has an inverted substantially truncated cone shape that gradually increases in diameter toward the base end side, and the large-diameter side end portion has a larger diameter than the base end portion of the locking projection 160. In addition, the end portion on the small diameter side has substantially the same diameter as the tip end portion of the locking projection 160. The locking projection 160 has a base end larger in diameter than the tip end with the retaining portion 164 interposed therebetween.

  As shown in FIGS. 1 to 3, the buffer rubber 150 having such a structure has a stopper portion 152 superimposed on the upper surface of the support plate portion 52 and an outer peripheral contact portion 153 having a support plate portion. The outer peripheral surface of 52 is attached to the support plate portion 52 of the flexible membrane outer tube fitting 24 in a manner superimposed on the outer peripheral surface.

  In addition, when the buffer rubber 150 is attached to the flexible membrane outer tube fitting 24, the lock protrusion 158 of the buffer rubber 150 is inserted into the lock hole 166 formed in the support plate 52, and A locking projection 160 of the buffer rubber 150 is inserted into a locking hole 168 formed in the support plate portion 52.

  As shown in FIG. 8, the locking hole 166 has a shape that is substantially the same as or slightly larger than the outer shape of the protruding tip portion of the locking protrusion 158 having a pair of engaging protrusions 162 and 162. It is a hole which has and is formed so as to penetrate the support plate portion 52 in the thickness direction. Further, the locking hole 166 has an irregular shape whose diameter changes in the circumferential direction, and a portion corresponding to the pair of engaging protrusions 162 and 162 has a large diameter. As will be described later, the longitudinal direction of the locking hole 166 corresponding to the protruding direction of the engaging protrusion 162 when the locking protrusion 158 is inserted into the locking hole 166 is directed to the support plate portion 52 of the buffer rubber 150. Is set in a direction different from the protruding direction of the engaging protrusion 162 in the attached state.

  The locking hole 168 is a substantially circular hole, and is formed so as to penetrate the support plate portion 52 in the thickness direction at a position corresponding to the locking protrusion 160 when the buffer rubber 150 is attached. The locking hole 168 is formed with a diameter that is the same as or larger than the base end of the locking projection 160, and the maximum diameter of the retaining portion 164 formed in the locking projection 160. The diameter is smaller than that.

  When the buffer rubber 150 is attached to the support plate 52, as shown in FIG. 9, the locking protrusion 158 is inserted into the locking hole 166 and the locking protrusion 160 is locked. The buffer rubber 150 is fixed to the support plate portion 52 by being inserted into the hole 168. As is clear from this, the locking projection 158 and the locking projection 160 are located on the opposite side of the inner bracket 38 from the stopper portion 152 in the opposing direction of the inner bracket 38 and the support plate 52. It is formed so as to protrude.

  The mounting of the shock absorbing rubber 150 to the support plate 52 will be described in more detail. First, as shown in FIG. 9A, a pair of protrusions 158 provided at the protruding tip of the locking protrusion 158 are provided. The cushioning rubber 150 and the support plate portion 52 are relatively positioned so that the protruding directions of the engagement protrusions 162 and 162 coincide with the longitudinal direction of the locking hole 166 of the support plate portion 52. Thereafter, the locking projection 158 is inserted into the locking hole 166, and the pair of engaging protrusions 162 and 162 are positioned below the support plate portion 52.

  Next, as shown in FIG. 9B, the shock absorbing rubber 150 is oscillated and displaced relative to the support plate portion 52 around the central axis l of the locking projection 158. As a result, the engaging protrusion 162 is engaged with the peripheral edge of the locking hole 166 to prevent the locking protrusion 158 from coming off from the locking hole 166, and the buffer rubber 150 is positioned on the upper surface of the support plate 52. Are held in a state of being superimposed on each other. The locking mechanism 170 according to this embodiment is configured by the engagement between the engaging protrusion 162 and the peripheral edge of the locking hole 166.

  Then, when the cushion rubber 150 is oscillated and displaced with respect to the support plate portion 52 to a position where the outer peripheral abutment portion 153 of the cushion rubber 150 abuts against the retaining wall portion 54 of the support flange 50, FIG. As shown, the two locking projections 160 each move over the locking hole 168. Thereafter, an external force in a direction in which the stopper 152 is brought into close contact with the support plate 52 is exerted on the buffer rubber 150, and the locking protrusion 160 is pushed into the locking hole 168, thereby swinging the buffer rubber 150. The displacement is limited, and the buffer rubber 150 is held in the intended mounting state. The locking projections 160 are inserted into the locking holes 168, and a locking action is exhibited between the outer peripheral surface of the locking projections 160 and the inner peripheral surface of the locking hole 168. Thus, the lock holding mechanism 172 in the present embodiment is configured. Further, in a mounted state in which the locking projection 160 is inserted into the locking hole 168, the protruding direction of the pair of engaging protrusions 162 and 162 is substantially orthogonal to the longitudinal direction of the locking hole 166.

  Further, in the attached state of the buffer rubber 150 to the support plate portion 52 shown in FIG. 9C, the latching portion 154 of the buffer rubber 150 is attached to the support plate portion 52 as shown in FIG. It is latched by the edge part of the outer peripheral side. Accordingly, the buffer rubber 150 is prevented from being displaced away from the support plate portion 52, and the locking protrusion 160 is prevented from coming off from the locking hole 168. The latching portion 154 is latched from below with respect to a latching wall portion 54 that projects downward from the edge of the support plate portion 52.

  In the engine mount 10 in which the shock absorbing rubber 150 is attached to the support plate 52 in this manner, the locking protrusion 158 is removed from the locking hole 166 between the engagement protrusion 162 and the peripheral edge of the locking hole 166. It is effectively prevented by the lock mechanism 170 using the locking. Therefore, the buffer rubber 150 is held in an attached state where it is superimposed on the upper surface of the support plate portion 52, and the intended buffering stopper action is stably exhibited in the stopper mechanism 148.

  In addition, when the buffer rubber 150 is attached, the locking protrusion 160 is inserted into the locking hole 168, so that the buffer rubber 150 swings and displaces around the central axis l of the locking protrusion 158. A lock holding mechanism 172 is configured to prevent this. Accordingly, the engagement between the engagement protrusion 162 and the peripheral edge portion of the lock hole 166 is maintained without being released, and the effect of preventing the buffer rubber 150 from falling off by the lock mechanism 170 is effectively exhibited.

  In addition, the locking protrusion 160 is provided with a retaining portion 164, and the large-diameter side end surface of the retaining portion 164 is locked to the peripheral edge of the locking hole 168, thereby Removal from the locking hole 168 is prevented. Therefore, the action of preventing the rocking rubber 150 from swinging and displacing by the lock holding mechanism 172 is stably exerted, and the shock absorbing rubber 150 is held at a predetermined mounting position. Further, since the end portion on the small diameter side of the retaining portion 164 is smaller in diameter than the retaining hole 168, the retaining protrusion 160 is retained by the guiding action by the peripheral wall surface of the retaining portion 164 having a tapered shape. The base hole can be easily inserted into the use hole 168.

  In addition, since the two sets of locking projections 160 and the locking holes 168 are provided, the lock holding mechanism 172 is configured to be more stable and effective. Dropout is effectively prevented.

  Further, the hooking portion 154 is hooked on the hooking wall portion 54, so that the upward displacement of the buffer rubber 150 is more firmly prevented. Moreover, the latching portion 154 is formed on the shock absorbing rubber 150 on the opposite side of the locking projection 158 in the longitudinal direction, and the latching projection 160 that is easy to come out compared to the locking projection 158 is the latching portion. 154 is held in the state of being inserted into the locking hole 168.

  As the buffer rubber constituting the stopper mechanism, the buffer rubber 180 shown in FIG. 11 can be adopted instead of the buffer rubber 150. That is, in the shock absorbing rubber 180, a stepped portion 182 is provided at an intermediate portion in the longitudinal direction of the stopper portion 152, and the thickness of the stopper portion 152 is longer at the end of the locking projection 158 in the longitudinal direction than the stepped portion 182. The dimensions are small.

  If such a shock absorbing rubber 180 is employed, the protrusion height of the shock absorbing rubber 180 from the upper surface of the support plate portion 52 is partially reduced at the site where the locking protrusion 158 is formed. As a result, the inner bracket 38 first comes into contact with a portion of the shock absorbing rubber 180 where the locking protrusion 158 is not formed, so that the stopper load is directly applied to the locking protrusion 158 at the initial input stage of the stopper load. Can be prevented. Therefore, the deformation of the locking projection 158 is prevented, the durability is improved, and the disconnection due to the deformation of the locking projection 158 is also avoided.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the structure of the engagement protrusion is not limited to the rectangular protrusion specifically described in the embodiment. That is, as long as the protrusion is formed on the outer peripheral surface, an engagement protrusion having a planar shape such as a semi-elliptical shape, a trapezoidal shape, or an irregular shape can be employed. In addition, the pair of engaging protrusions does not necessarily have to be formed, and may be provided only at one place on the circumference, or three or more may be formed on the circumference. .

  Further, only one locking protrusion may be formed, or three or more may be formed. Further, when a plurality of locking projections are formed, the protruding directions of the plurality of locking projections may be different from each other.

  Further, the retaining portion 164 formed on the locking projection 160 is not essential and may be omitted. In that case, for example, the base end portion of the locking projection is made larger in diameter than the locking hole, and the base end portion of the locking projection becomes the locking hole when the shock absorber is attached. It is desirable to prevent the locking holes from coming off by being pushed in.

  Further, the locking protrusion and the locking protrusion do not necessarily protrude in the same direction. For example, the locking protrusion is formed so as to protrude in the main acting direction of the stopper load, and the locking protrusion is formed in a direction substantially orthogonal to the locking protrusion, and is locked to the support plate 52. It is also possible to employ a structure in which a locking hole is formed in the latching wall portion 54 while the locking hole is formed.

  Further, the buffer rubber 150 may be attached to the inner bracket 38 or may be attached to both the inner bracket 38 and the support plate portion 52.

  Further, the scope of application of the present invention is not limited to a fluid-filled active vibration isolator for automobiles, but is a fluid-filled active vibration isolator employed in railway vehicles, industrial vehicles, and the like. The present invention can also be suitably applied to an apparatus. Furthermore, in addition to engine mounts, it can be applied to body mounts, subframe mounts, differential mounts, and the like.

10: engine mount (fluid-filled active vibration isolator), 12: first mounting member, 14: second mounting member, 16: main rubber elastic body, 30: flexible membrane, 38: inner bracket ( Abutting portion), 52: support plate portion (abutting portion), 68: vibration member, 92: pressure receiving chamber, 98: equilibrium chamber, 104: orifice passage, 108: electromagnetic actuator, 148: stopper mechanism, 150, 180: buffer rubber, 154: latching portion, 158: locking projection, 160: locking projection, 162: engaging projection, 166: locking hole, 168: locking hole, 170: locking mechanism, 172: Lock holding mechanism

Claims (5)

The first attachment member and the second attachment member are connected by a main rubber elastic body, and one opening of the second attachment member is closed by the main rubber elastic body, and the second attachment The other opening of the member is closed by a vibration member, a pressure receiving chamber is formed between the main rubber elastic body and the vibration member, and the outer side of the main rubber elastic body is a flexible film. An equilibrium chamber is formed so as to be covered, and an incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber, and an orifice passage is formed to communicate the pressure receiving chamber and the equilibrium chamber with each other. In a fluid-filled active vibration isolator provided with an electromagnetic actuator that applies a vibration force to a vibration member,
By attaching the shock-absorbing rubber to at least one corresponding contact portion with the contact portions provided on the first attachment member and the second attachment member facing each other, the first attachment member and the second attachment member While a stopper mechanism is configured to limit the relative displacement amount of the two mounting members in the approaching direction in a buffering manner,
A locking projection and a locking projection are integrally formed on the buffer rubber, and the locking hole into which the locking projection is inserted at the contact portion to which the buffer rubber is attached and the locking rubber A locking hole into which the protrusion is inserted is formed,
The lock hole has an irregular shape with a different inner diameter dimension in the circumferential direction, and an engagement protrusion protruding from the outer peripheral surface is formed at the tip of the lock protrusion penetrating the lock hole. The cushioning rubber is rotated around the central axis of the locking projection to the mounting position on the corresponding contact portion in the inserted state of the locking projection into the locking hole, so that the peripheral portion of the locking hole is A lock mechanism configured to lock the engaging protrusion and prevent the locking protrusion from being extracted from the locking hole; and
The locking protrusion is inserted into the locking hole at a position where the buffer rubber is attached to the corresponding contact portion, thereby preventing the rotation of the buffer rubber and preventing the rotation of the buffer rubber from the locking hole. A fluid-filled active vibration isolator comprising a lock holding mechanism that holds the lock protrusion in a state where the lock protrusion is prevented from being pulled out.   The buffer rubber has a longitudinal shape, the locking protrusion is formed at one end of the buffer rubber in the longitudinal direction, and the locking protrusion is formed at the other end in the longitudinal direction of the buffer rubber. The fluid-filled active vibration isolator according to claim 1, wherein a portion is formed. The buffer rubber has a longitudinal shape, and the lock protrusion is formed on one end side in the longitudinal direction of the buffer rubber and is inserted into the lock hole of the contact portion,
A position away from the locking protrusion in the longitudinal direction other end side of the rubber buffer in the buffer rubber, and hook portion positioned on the locking projection and the outer peripheral edge portion is integrally formed , together with the engaging projection is inserted into the locking hole of the abutting portion,該掛stop part according to claim 1 or 2 is hooked on the edge of the contact portion Fluid-filled active vibration isolator.   The fluid-filled active type according to any one of claims 1 to 3, wherein a height of protrusion of the buffer rubber from the abutting portion is smaller than other portions in a portion where the locking protrusion is formed. Anti-vibration device.   The locking protrusion in the shock absorbing rubber protrudes from the back side of the shock absorbing rubber toward the opposite side in the opposing direction of the two abutting portions constituting the stopper mechanism. The fluid-filled active vibration isolator according to any one of the above.

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