JP4088970B2 - Active fluid filled vibration isolator - Google Patents

Description

  The present invention is employed in, for example, an automobile engine mount, body mount, vibration control device, or the like, and can exhibit an active or counterbalanced vibration isolation effect against the vibration to be isolated. In particular, a part of the wall portion of the vibration action chamber in which the incompressible fluid is sealed is constituted by a vibration plate, and the vibration plate is driven by the actuator to control the pressure of the vibration action chamber. The present invention relates to an active fluid-filled vibration isolator that can obtain an active vibration isolating effect.

  As a type of anti-vibration device as an anti-vibration coupling body or an anti-vibration support body interposed between members constituting the vibration transmission system, the first mounting member and the second mounting member are connected by a rubber elastic body. In addition, a part of the wall portion is formed of the main rubber elastic body to form a vibration action chamber into which vibration is input, and an incompressible fluid is sealed in the vibration action chamber, while the wall portion of the vibration action chamber A fluid enclosure in which another part of the actuator is constituted by a vibration plate, and an actuator for driving the vibration plate is provided, and the vibration chamber is pressure-controlled by exciting the vibration plate An active vibration isolator of the type is known. For example, the anti-vibration device described in Patent Literature 1, Patent Literature 2, and the like. Such an active fluid-filled vibration isolator is capable of counteracting vibrations by applying an excitation force corresponding to vibration to be vibrated against a member to be vibration-isolated, By actively changing the spring characteristics according to the input vibration and reducing the dynamic spring, etc., it is possible to obtain a positive anti-vibration effect against the vibration. Application is considered.

  By the way, in such an active fluid-filled vibration isolator, since it is necessary to highly accurately control the vibration plate with a frequency and phase corresponding to vibration to be vibrated, as an actuator, for example, As described in the above-mentioned patent documents and the like, vibration means that drives the armature using magnetic force or electromagnetic force generated by energization of the coil is preferably employed. Also, such an actuator is generally connected to the main rubber elastic body by connecting the first mounting member and the second mounting member with the main rubber elastic body for reasons such as the manufacturing process of the vibration isolator. It will be formed separately from the main body of the vibration isolator that forms the vibration action chamber in which a part of the wall is formed by the vibration plate, and the separate body of the actuator is fixed to the second mounting member. On the other hand, the armature is connected and fixed to the vibration plate of the vibration isolator main body via a connecting rod later.

  However, since the vibration plate is elastically connected to the second mounting member via the support rubber elastic body in order to allow the displacement, the variation in the shrinkage amount during the vulcanization molding of the support rubber elastic body. Also, the position of the vibration plate with respect to the second mounting member is set with high accuracy due to variations in the assembly position when the support rubber elastic body is fixed to the second mounting member by caulking, etc. Difficult to do. In addition, since the actuator coil is also fixed to the second mounting member with fixing bolts, etc., the second mounting is caused by component dimensional errors or variations in the assembly position when fixing. It is difficult to set the mounting position on the member with high accuracy. In particular, the coil of the actuator is often fixed to the second mounting member via a separate bracket for mounting the second mounting member to the vibration isolation target member, and when such a separate actuator is interposed, The dimensional error of the separate bracket and the variation in the assembly position with respect to the second mounting member are also superimposed, and it becomes more difficult to ensure the accuracy of the mounting position of the actuator with respect to the second mounting member.

  For this reason, the vibration plate and the actuator to be connected to each other are overlapped by the position error of the vibration plate with respect to the second mounting member and the position error of the coil of the actuator with respect to the second mounting member. A large variation is likely to occur in the relative position to the armature, and it may be difficult to connect the vibration plate and the armature with the connecting rod.

  In order to solve such a problem, for example, as shown in Patent Document 3, the relative position between the vibration plate and the armature is obtained by connecting the connecting rod to the armature by a metal spring so as to be able to swing. It is also possible to deal with the deviation. However, in order to connect the connecting rod to the armature in such a manner that the neck can swing, if a neck swing repeatedly occurs when the vibration plate is vibrated, there is a risk that the neck displacement is increased due to a resonance state. Furthermore, as the displacement of the neck swing increases, there is a risk that the operation and durability of the actuator may be hindered due to the occurrence of vibrations, abnormal noises, and load effects such as a twisting force on the sliding portion of the armature. Also, when the metal spring is elastically deformed, there is a risk of galling on the support surface of the metal spring, which may cause abnormal noise, and a rubber layer or a resin protective layer is attached to the support surface of the metal spring In some cases, they are scraped off and dust is easily generated, and the generated dust may enter the sliding gap of the armature and hinder the operation of the actuator.

  In addition, in the actuator disclosed in Patent Document 3, the biasing force of the coil spring that exerts a biasing force on the connecting rod assembled to the armature is constantly exerted on the vibration plate via the connecting rod. Yes. For this reason, since the biasing force of the coil spring is always exerted on the supporting rubber elastic body, if the biasing force of the coil spring is increased, there is a risk that the supporting rubber elastic body will become loose, and the connecting rod may be armature. When the biasing force of the coil spring for positioning is small, the neck of the connecting rod is easily generated, and the vibration operation may become unstable. Further, the vibration accompanying the elastic deformation of the coil spring may be transmitted as it is from the housing to the second mounting member and cause abnormal noise.

JP-A-6-264955 JP-A-11-351313 JP 2001-1765 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the actuator formed separately from the vibration isolator main body has good workability. In particular, even if the relative position of the armature of the actuator with respect to the vibration plate varies, the connecting rod that connects the vibration plate and the armature can be easily assembled and the actuator can be An object of the present invention is to provide an active fluid filled type vibration isolator having a novel structure capable of stably and efficiently exerting a vibration driving force from an armature to a vibration plate via a connecting rod.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are based on the entire specification and drawings, or based on the inventive concept that can be grasped by those skilled in the art from these descriptions. It should be understood that

(Aspect 1 of the present invention)
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 a part of the wall portion is configured by the main rubber elastic body so that the incompressible fluid is formed. Is formed to form a vibration action chamber in which pressure fluctuations are generated based on elastic deformation of the main rubber elastic body when vibration is input between the first mounting member and the second mounting member. Another part of the wall of the vibration working chamber is constituted by a vibration plate, and the vibration plate is elastically supported by the support rubber elastic body so as to be displaceable with respect to the second mounting member. An active type in which an actuator for controlling the pressure of the vibration action chamber by applying a driving force to the vibration plate to displace the vibration plate is disposed on the opposite side of the vibration action chamber with the vibration plate interposed therebetween. In the fluid-filled vibration isolator, (a) the coil is fixed to the second mounting member. (B) An armature is incorporated in the hollow hole of the coil so as to be displaceable in the axial direction, and (c) The armature is driven and displaced in the vibration displacement direction of the vibration plate by energizing the coil. (D) a drive rod projecting from the vibration plate toward the armature, and (e) an insertion hole extending in the axial direction with respect to the armature. The drive rod is inserted into the insertion hole in a loosely inserted state, and (f) the drive rod is locked to the armature at the protruding tip portion to prevent the drive rod from coming out from the armature to the vibration plate side. And (g) a rubber-like urging body is disposed between the vibration plate and the armature, and the urging force of the rubber-like urging body causes the locking portion to be attached to the armature. Against the axis The biasing means for positioning and holding the drive rod elastically pressed to so as to permit sliding displacement of the angular direction while protruding toward the pressurized oscillating plate from the armature to incorporate in the actuator, characterized And

  In the active fluid-filled vibration isolator having the structure according to this aspect, the drive rod is disposed in such a manner that the sliding displacement in the direction perpendicular to the axis with respect to the armature is allowed. Even if a relative displacement between the vibration plate and the armature occurs due to the overlap of the upper position, etc., the relative displacement is absorbed by the sliding displacement between the drive rod and the armature. Thus, the assembly can be easily performed while suppressing the relative inclination of the drive rod and the armature. In addition, since the relative inclination of the drive rod and armature can be suppressed and assembled, the armature's excitation force can be stably and efficiently applied to the drive rod, thereby stabilizing the vibration plate. Thus, it is possible to vibrate efficiently.

  Further, since the urging means is incorporated in the armature, the urging force and the reaction force of the urging means are both applied to the armature, and it is prevented from acting on the supporting rubber elastic body. As a result, the urging force of the urging means can be sufficiently obtained, and since the urging force does not act on the support rubber elastic body, the durability of the support rubber elastic body does not become a problem. Furthermore, since the armature incorporating the biasing means is not directly fixed to the coil housing or the second mounting member, the coil housing or the second mounting member is vibrated due to the deformation of the biasing means. Therefore, the generation of abnormal noise is not a problem.

  In addition to the fact that the drive rod is allowed to slide in a direction perpendicular to the axis with respect to the armature, the head rod itself is suppressed, and the drive rod has a sufficiently large damping capacity compared to a metal spring. Because the elastic biasing member is elastically held against the armature by the urging member, even if a neck swing occurs or vibrations occur due to sliding displacement, these vibrations are It is quickly suppressed by the damping action. Further, since it is not a metal spring, the generation of abnormal noise due to contact, rubbing, galling or the like during elastic deformation is not a problem, and generation of dust due to galling on other members can be advantageously avoided. In addition, the rubber-like urging body mentioned here includes an elastomer material made of a synthetic resin material in addition to various natural rubbers and artificial rubbers.

  Further, in order to achieve better sliding displacement between the locking portion provided on the drive rod and the armature, a sliding member made of a low friction material such as polyethylene or polytetrafluoroethylene is provided on these sliding surfaces. It may be incorporated. Further, a low friction process may be performed on the sliding surface between the engaging portion and the step portion of the armature.

(Aspect 2 of the present invention)
According to a second aspect of the present invention, in the active fluid-filled vibration isolator according to the first aspect, the engagement member is screwed onto the drive rod protruding from the vibration plate. A stop portion is configured, and by adjusting the screwing position of the locking member with respect to the drive rod, the locking position of the locking member with respect to the drive rod can be changed and set in the axial direction of the drive rod. It is characterized by that.

  In the active fluid-filled vibration isolator constructed according to this aspect, the axial position of the drive rod relative to the armature can be easily and accurately set by changing the position of the locking member in the axial direction of the drive rod. It becomes possible to adjust well. Thus, by adjusting the position of the armature in the axial direction with respect to the vibration plate, for example, the armature can be accurately positioned with respect to the coil, or the support rubber elastic body can be initially deformed by a static force exerted on the armature. It is also possible to avoid this, and the vibration isolation characteristics of the active fluid filled vibration isolator can be adjusted and set with high accuracy.

  In this aspect, the locking member may be any member that can substantially adjust the axial length of the drive rod that connects the vibration plate and the armature by adjusting the screwing amount. The specific structure of itself and the engagement structure with respect to the drive rod such as screwing are not limited at all. For example, the locking member may be constituted by a nut and screwed to a bolt-structured rod integrally formed at the tip of the drive rod, or the locking member itself may be constituted by a nut with a rod, A drive rod for connecting the vibration plate and the armature may be configured by screwing the rod portion of the stop member to a fixed rod protruding from the vibration plate. Furthermore, since the locking member is not limited to the nut structure, it may be configured with a bolt structure in which the locking member is screwed into the fixed rod.

(Aspect 3 of the present invention)
According to a third aspect of the present invention, in the active fluid-filled vibration isolator according to the first or second aspect, a step surface is formed at an axially intermediate portion of the insertion hole in the armature, and the step surface The locking portions are overlapped and locked so as to be displaceable in a direction perpendicular to the axis. In the active fluid-filled vibration isolator constructed according to this aspect, the drive rod and the armature are engaged inside the armature, so that the axial dimensions of the armature and the drive rod can be made compact.

(Aspect 4 of the present invention)
According to a fourth aspect of the present invention, in the active fluid-filled vibration isolator according to any one of the first to third aspects, a relative allowable displacement amount in a direction perpendicular to the axis of the drive rod with respect to the armature is 0. The permissible displacement amount in the direction perpendicular to the axis with respect to the insertion hole of the drive rod and the permissible displacement amount in the direction perpendicular to the axis at the sliding displacement permissible portion with respect to the armature of the locking portion are set so as to be in the range of 2 mm to 3 mm It is characterized by being.

  In the active fluid-filled vibration isolator constructed according to this aspect, the driving force is more stably transmitted between the driving rod and the armature. That is, if the allowable displacement is too small, there is a possibility that the relative positional deviation between the vibration plate and the armature cannot be sufficiently absorbed. On the other hand, if the gap is too large, it will allow more displacement than necessary, which may cause rattling of the drive rod, and the drive rod's center axis is far from the center axis of the armature. The driving reaction force exerted from the rod becomes an eccentric load with respect to the armature, and there is a possibility that the stability of the operation is lowered. Here, by setting the relative permissible displacement amount in the direction perpendicular to the axis of the arm of the drive rod within the range according to this aspect, the drive rod absorbs the relative displacement between the vibration plate and the armature. Therefore, it is possible to reduce the drive reaction force exerted on the armature as an eccentric load with respect to the armature as much as possible, and to effectively ensure the operation stability.

(Aspect 5 of the present invention)
According to a fifth aspect of the present invention, in the active fluid-filled vibration damping device according to any one of the first to fourth aspects, a recess that opens toward the armature is formed in the vibration plate. The rubber-like urging member is disposed in the recess and protrudes toward the armature. In the active fluid-filled vibration isolator having the structure according to this aspect, the rubber volume of the rubber-like biasing body can be advantageously ensured, and the durability of the rubber-like biasing body can be improved. .

(Aspect 6 of the present invention)
According to a sixth aspect of the present invention, in the active fluid filled type vibration damping device according to the fifth aspect, a buffer rubber is formed on a surface of the vibration plate facing the armature of the peripheral wall portion of the recess. A stopper mechanism for bufferingly restricting the amount of movement of the vibration plate toward the approaching side with respect to the armature by the peripheral wall portion being brought into contact with the armature via the buffer rubber; Features. In the active fluid-filled vibration isolator having the structure according to this aspect, the excessive displacement of the armature is limited by such a stopper mechanism, and the operation characteristics of the actuator are stabilized. Furthermore, since the armature and the vibration plate are elastically brought into contact with each other via the buffer rubber, the durability of the armature and the vibration plate is improved, and the occurrence of hitting sound due to the contact is reduced. The

(Aspect 7 of the present invention)
According to a seventh aspect of the present invention, in the active fluid-filled vibration isolator according to the fifth or sixth aspect, a flexible film is disposed on the opposite side of the vibration working chamber with the support rubber elastic body interposed therebetween. Forming a variable volume balance chamber in which an incompressible fluid is sealed between the opposing surfaces of the support rubber elastic body and the flexible membrane, and forming an orifice passage for connecting the balance chamber to the vibration working chamber. At the center of the flexible membrane, a reverse cup-shaped fixing bracket that opens toward the armature is provided, and the fixing bracket is fixed to the vibration plate, and the fixing The drive rod protrudes from the central portion of the metal fitting, and the recess is formed by the fixing metal fitting, and the rubber-like biasing body is disposed there.

  In the active fluid-filled vibration isolator having the structure according to this aspect, a higher level of vibration isolating effect can be obtained based on the flow action of the incompressible fluid flowing in the vibration action chamber and the equilibrium chamber. However, in this case, an actuator that positively generates a fluid flow action by controlling the internal pressure of the vibration action chamber by applying a driving force corresponding to the vibration to be damped to the vibration plate is advantageous. By adopting the present invention for such an actuator, a more stable and efficient vibration isolation effect can be obtained.

  Note that the rubber-like biasing body may be formed integrally with the flexible film, for example, in a form in which the flexible film wraps around the inside of the fixing bracket, or may be formed separately from the flexible film. However, the degree of freedom in setting the spring characteristics can be improved by using a separate body. And as a mounting method to the fixing bracket when the rubber-like urging body is formed as a separate body, it is not limited to adhesion, and it may be simply fitted and fixed to the fixing bracket.

(Aspect 8 of the present invention)
According to an eighth aspect of the present invention, in the active fluid-filled vibration isolator according to the seventh aspect, the second attachment member has a substantially cylindrical shape with a large diameter, and one opening in the axial direction thereof. The first mounting member is disposed apart from the part side, and the main body rubber elastic body elastically connects the first mounting member and the second mounting member to the axial direction of the second mounting member. One opening is fluid-tightly closed, and the other opening of the second mounting member is fluid-tightly closed by the flexible film, and is axially intermediate between the second mounting members. The support rubber elastic body that elastically supports the vibration plate is provided so as to be partitioned on both sides in the axial direction by the portion, and the vibration working chamber is formed on one side across the support rubber elastic body. At the same time, the equilibrium chamber is formed on the other side, and fixed to the flexible membrane. The fixing bracket is superposed on and fixed to the vibration plate, and the drive rod protrudes outward from the vibration plate and the fixing bracket on the central axis of the second mounting member. In addition, the coil is disposed on the other opening side of the second mounting member and supported by the second mounting member, and the drive is performed with respect to the armature incorporated in the coil. The vibration plate is connected by a rod.

  In the active fluid-filled vibration isolator having the structure according to this aspect, by adopting the substantially cylindrical second mounting member, the vibration action chamber and the equilibrium chamber are overlapped in the axial direction inside thereof. Thus, the active fluid-filled vibration isolator according to aspect 7 is formed with good space efficiency. In addition to the fact that the vibration plate is supported by the second mounting member through the supporting rubber elastic body on the outer peripheral portion thereof, and can be stably disposed, the coil of the actuator is also By being coaxially disposed with respect to the vibration working chamber and the equilibrium chamber and stably supported, the driving force transmission efficiency and the operational stability can be improved. As described above, in the active fluid-filled vibration isolator having the structure according to this aspect, each component can be formed efficiently and space efficiency and operability can be improved.

  As is clear from the above description, in the active fluid-filled vibration isolator having the structure according to the present invention, the drive rod protruding from the vibration plate slides in a direction perpendicular to the axis with respect to the armature of the actuator. Therefore, even if there is a variation in the relative position of the armature with respect to the vibration plate, it can be easily assembled and the drive force by the actuator can be applied to the vibration plate. It is possible to exert it stably and efficiently.

  In addition, the biasing means that elastically presses the drive rod against the armature is not a metal spring, but a rubber-like biasing body, which generates abnormal noise due to contact, rubbing, galling, etc. during elastic deformation. Therefore, the generation of dust due to galling on other members can be advantageously avoided.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an automobile engine mount 10 as a first embodiment of the present invention. The engine mount 10 includes a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member that are spaced apart from each other and disposed therebetween. A mount main body 17 elastically connected by an interposed main rubber elastic body 16 is fitted into a bracket 19. In the engine mount 10, the first mounting bracket 12 is attached to a power unit (not shown), while the second mounting bracket 14 is attached to an automobile body (not shown) so that the power unit is supported by vibration isolation against the body. It has become. Further, under such a mounted state, the engine mount 10 has a shared load of the power unit between the first mounting bracket 12 and the second mounting bracket 14 in the mount center axis direction which is the vertical direction in FIG. As a result, the main rubber elastic body 16 is elastically deformed in the direction in which the first mounting bracket 12 and the second mounting bracket 14 approach each other. Further, the main vibration to be vibration-proofed is input between the first mounting bracket 12 and the second mounting bracket 14 in a direction in which the mounting brackets 12 and 14 approach / separate each other. ing. In the following explanation, the vertical direction means the vertical direction in FIG. 1 in principle.

  More specifically, the first mounting member 12 has a truncated conical shape. In addition, an annular plate-shaped stopper portion 18 protruding on the outer peripheral surface is integrally formed at the large-diameter side end portion of the first mounting member 12. Further, a fixed shaft 20 is integrally projected from the large-diameter end toward the upper side in the axial direction. The fixed shaft 20 is formed with a fixing screw hole 22 that opens to the upper end surface. The first mounting bracket 12 is attached to a power unit of an automobile (not shown) by a fixing bolt (not shown) screwed into the fixing screw hole 22.

  On the other hand, the second mounting bracket 14 has a large-diameter, generally cylindrical shape. Further, a step portion 24 is formed at an axially intermediate portion of the second mounting bracket 14, and the upper side in the axial direction is a large diameter portion 26 across the step portion 24, and the lower side in the axial direction is The small diameter portion 28 is used. A thin seal rubber layer 30 is formed on the inner peripheral surface of the large diameter portion 26. Further, a diaphragm 32 made of a thin rubber film as a flexible film is disposed in the opening portion on the lower side in the axial direction, and the outer peripheral edge portion of the diaphragm 32 is in the axial direction of the second mounting bracket 14. By vulcanizing and bonding to the lower opening edge, the lower opening in the axial direction of the second mounting bracket 14 is covered with a fluid-tight cover. Further, a connecting fitting 34 as a fixing fitting having a substantially inverted cup shape is vulcanized and bonded to the center portion of the diaphragm 32.

  The first mounting bracket 12 is positioned so as to be spaced apart upward in the axial direction of the second mounting bracket 14, and the first mounting bracket 12 and the second mounting bracket 14 are made of a main rubber elastic body. 16 is elastically connected.

  The main rubber elastic body 16 has a substantially truncated cone shape as a whole, and a mortar-shaped concave surface 36 is formed on the large-diameter side end surface. The first mounting bracket 12 is vulcanized and bonded to the end surface on the small diameter side of the main rubber elastic body 16 in a state of being inserted in the axial direction. The stopper portion 18 of the first mounting bracket 12 is overlapped with the small diameter side end face of the main rubber elastic body 16 and vulcanized and bonded, and the contact rubber 38 protruding upward from the stopper portion 18 It is formed integrally with the rubber elastic body 16. A connecting sleeve 40 is vulcanized and bonded to the outer peripheral surface on the large diameter side of the main rubber elastic body 16.

  The connecting sleeve 40 vulcanized and bonded to the outer peripheral surface on the large-diameter side of the main rubber elastic body 16 is fitted into the large-diameter portion 26 of the second mounting bracket 14 so that the large-diameter portion 26 is reduced in diameter. Thus, the main rubber elastic body 16 is fluidly fitted and fixed to the second mounting bracket 14. As a result, the axially upper opening of the second mounting bracket 14 is covered fluid-tightly by the main rubber elastic body 16, so that the main rubber elastic body is placed inside the second mounting metal 14. Between the opposing surfaces of 16 and the diaphragm 32, a region that is fluid-tightly blocked from the external space is formed, and an incompressible fluid is sealed therein.

  As the incompressible fluid to be enclosed, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like can be used, and in particular, to effectively obtain a vibration isolation effect based on the resonance action of the fluid. And a viscosity of 0.1 Pa. A low-viscosity fluid of s or less is preferably employed.

  Further, a partition member 42 and an orifice member 44 are incorporated in the second mounting member 14 and are disposed between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 32.

  The partition member 42 has a support rubber elastic body 46 that spreads with a predetermined thickness, and a vibration plate 48 is vulcanized and bonded to a central portion of the support rubber elastic body 46. The vibration plate 48 has a shallow substantially inverted cup shape, and the outer peripheral edge portion thereof is vulcanized and bonded to the inner peripheral edge portion of the support rubber elastic body 46. An annular outer peripheral metal fitting 50 is vulcanized and bonded to the outer peripheral edge of the support rubber elastic body 46. In addition, the outer peripheral metal fitting 50 is formed with a circumferential groove 52 that extends continuously in the circumferential direction.

  And the axial direction upper side opening part of this outer periphery metal fitting 50 is made into the flange-shaped part 51 extended to radial direction outward, the flange-shaped part 51 is piled up on the step part 24 of the 2nd attachment metal fitting 14, and a step part 24 and the connecting sleeve 40 are clamped and fixed. As a result, the partition member 42 is disposed so as to extend in the direction perpendicular to the axis at the intermediate portion between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 32, and the interior of the second mounting bracket 14 is divided into two sides in the axial direction. I'm coughing. Therefore, on the upper side across the partition member 42, a vibration action in which a part of the wall portion is configured by the main rubber elastic body 16 and pressure fluctuations are generated due to elastic deformation of the main rubber elastic body 16 when vibration is input. A working fluid chamber 54 as a chamber is formed. On the other hand, below the partition member 42, an equilibrium chamber 56 is formed in which a part of the wall portion is constituted by the diaphragm 32 and volume change is easily allowed.

  Further, the orifice member 44 is configured by superimposing the upper and lower thin plates on each other, and the outer peripheral edge portion thereof is overlapped with the flange-like portion 51 of the outer peripheral metal fitting 50, so that the flange-like portion 51 and the main rubber elasticity By being sandwiched between the inner peripheral edge of the large-diameter side end of the body 16, the body 16 is fixedly supported by the second mounting bracket 14 via the outer peripheral bracket 50. As a result, the orifice member 44 is disposed so as to extend in the direction perpendicular to the axis at the intermediate portion between the opposing surfaces of the main rubber elastic body 16 and the partition member 42, and the working fluid chamber 54 is divided into two sides in the axial direction. Yes. Thus, a pressure receiving chamber 58 having a wall portion formed of the main rubber elastic body 16 is formed on the upper side of the orifice member 44. On the other hand, on the lower side of the orifice member 44, a vibration chamber 60 is formed in which a part of the wall portion is composed of a vibration plate 48.

  Further, a circumferential passage 45 extending continuously in the circumferential direction between the overlapping surfaces of the upper and lower thin plates is formed in the outer peripheral edge portion of the orifice member 44. One end of the circumferential passage 45 is connected to the pressure receiving chamber 58, and the other end is connected to the excitation chamber 60. Thus, a first orifice passage 62 that allows the pressure receiving chamber 58 and the vibration chamber 60 to communicate with each other is formed. Note that the first orifice passage 62 is tuned to a medium frequency range such as idling vibration of about 30 to 40 Hz, for example.

  Furthermore, the outer peripheral edge of the orifice member 44 is overlapped with the outer peripheral edge of the partition member 42, and the second orifice is formed by covering the peripheral groove 52 formed in the outer peripheral edge of the outer peripheral metal fitting 50. A passage 65 is formed. The second orifice passage 65 has one end connected to the pressure receiving chamber 58 through the vibration chamber 60 and the first orifice passage 62, and the other end connected to the equilibrium chamber 56. As a result, a second orifice passage 65 that allows the pressure receiving chamber 58 and the equilibrium chamber 56 to communicate with each other is formed. The second orifice passage 65 is tuned to a low frequency region such as an engine shake of about 10 Hz.

  The specific form and tuning of the orifice passage are not limited in any way. In addition to the above-described embodiment, for example, the pressure receiving chamber 58 and the excitation chamber 60 are directly passed through the central portion of the orifice member 44. A first orifice passage in the form of a through hole to be communicated is formed, and the first orifice passage is tuned to a high frequency region such as a booming sound of about 50 to 150 Hz, while the circumferential passage 45 and the outer periphery of the orifice member 44 The second orifice passage may be formed by directly connecting the peripheral grooves 52 of the metal fitting 50 in series.

  Further, the mount body 17 having the above-described structure has a second mounting bracket 14 fitted in a bracket 19, and is attached to a vehicle body (not shown) via the bracket 19.

  The bracket 19 has a thick cylindrical shape, a stepped portion 64 is formed on the inner peripheral surface of the central portion in the axial direction, and the upper portion of the stepped portion 64 has a large diameter. A stopper fitting 66 is bolted to the upper end surface of the bracket 19, and a stopper fitting 68 is bolted to the lower end surface. The stopper fitting 66 has a large-diameter cylindrical shape, and has a flange portion 70 that spreads outward at the lower end opening. The flange portion 70 is overlapped with the upper end surface of the bracket 19 and fixed with bolts. Yes. On the other hand, a contact portion 72 extending inward is formed in the upper end opening, and the stopper portion 18 of the first mounting bracket 12 contacts the contact portion 72 via a contact rubber 38. The stopper function in the rebound direction is exhibited. Note that an umbrella-shaped brim member 74 is attached to the bolt fixing portion of the first mounting member 12 so as to cover the upper end opening of the stopper member. On the other hand, the stopper metal 68 has an annular plate shape, and is bolted with an inner diameter dimension slightly projecting radially inward at the lower end opening of the bracket 19.

  The second mounting fitting 14 fitted into the bracket 19 is fixed in an axial direction by the flange portion 70 of the stopper fitting 66 and the stopper fitting 68 so that it cannot be pulled out. The bracket 19 is integrally formed with a plurality of leg portions 76 that protrude on the outer peripheral surface and extend downward, and these leg portions 76 are placed on a body of an automobile (not shown) and fixed with fixing bolts. As a result, the engine mount 10 is mounted on the body of the automobile.

  Further, in the mount body 17, the vibration plate 48 provided on the partition member 42 is overlapped and fixed in close contact with the connecting fitting 34 provided on the diaphragm 32. Then, a connecting rod 78 as a drive rod is fixed to the vibration plate 48 and the connection fitting 34, and the connection rod 78 is protruded downward in the axial direction from the vibration plate 48 and the connection fitting 34.

  In addition, a sandwiching rubber layer 80 integrally formed with the diaphragm 32 is attached to the connection fitting 34 over substantially the entire circumference, so that the space between the overlapping surface with the vibration plate 48 is fluid. It is tightly sealed. Further, the vibration plate 48 and the connection fitting 34 are overlapped at each upper bottom portion in the center, and a caulking portion 82 formed integrally with the upper end portion of the connection rod 78 is inserted through these center portions. The vibration plate 48 and the coupling fitting 34 are caulked and fixed in close contact by the caulking portion 82, and the coupling rod 78 penetrates the coupling fitting 34 from the vibration plate 48 and extends outward in the axial direction. The vibration plate 48 and the coupling fitting 34 are integrated with each other, and a recess 83 that opens toward the armature 100 described later is formed.

  Further, an electromagnetic drive means as an actuator is provided in the axially lower side of the second mounting member 14 from which the connecting rod 78 is protruded, that is, on the side opposite to the working fluid chamber 54 across the vibration plate 48 and the connecting member 34. 84 is disposed and attached to the bracket 19.

  The electromagnetic driving means 84 includes a coil 86 and a housing 88 fixedly assembled to the coil 86 so as to surround the coil 86. The housing 88 has a through hole 96 formed in the center thereof, and is formed with an outer yoke portion 90 extending over the entire circumference in an L-shaped cross section so as to surround the outer peripheral surface and the lower end surface of the coil 86. A cylindrical inner yoke 92 extending to cover the inner peripheral surface of the coil 86 over the entire axial direction is assembled to the inner peripheral surface of the coil 86. The coils 86 and the inner yoke 92 are assembled so that their upper end portions have substantially the same axial height, and are set slightly lower than the upper end portion of the outer yoke portion 90. Each of the outer yoke portion 90 and the inner yoke 92 is made of a ferromagnetic material, and a magnetic pole is formed at the upper end edge portion when the coil is energized.

  On the other hand, the housing 88 is formed with an annular fixing portion 94 extending from the upper end portion of the outer yoke portion 90 to the outer periphery, and the annular fixing portion 94 is superimposed on the lower surface of the bracket 19 and fixed with a fixing bolt. As a result, the central axis of the coil 86 is substantially aligned with the central axis of the mount body 17 and aligned with the central axes of the second mounting bracket 14 and the vibration plate 48. Further, a lid member 98 is mounted below the housing 88 to prevent dust and the like from entering the through hole 96 of the housing 88.

  The armature 100 is assembled in the through hole 96 of the housing 88 in which the coil 86 is assembled. The armature 100 is formed of a ferromagnetic material having a circular block shape as a whole, and has an outer diameter slightly smaller than the inner diameter of the inner yoke 92 and is fitted into the inner yoke 92 on the same central axis as the coil 86. Thus, relative displacement in the axial direction is possible. Further, the armature 100 has an axial length dimension slightly larger than that of the coil 86, and an upper end portion of the armature 100 is a radial protrusion 101 having an outer diameter that is widened to the vicinity of the inner peripheral edge of the outer yoke 90. Yes. The radial protrusion 101 forms a magnetic gap between the outer yoke portion 90 and the inner yoke 92 so that an effective magnetic attractive force can be applied. For example, as shown in the figure, effective magnetic attraction force is generated between the radial protrusion 101 and the upper edge of the outer yoke 90 and between the radial protrusion 101 and the upper edge of the inner yoke 92. It is designed to work.

  The armature 100 is formed with an insertion hole 104 that passes through the central axis. The insertion hole 104 has an axial intermediate portion as a stepped surface 106, an axially upper portion with the stepped surface 106 sandwiched therebetween as a small diameter portion 108, and an axially lower portion as a large diameter portion 110. The small-diameter portion 108 has a stepped portion 116 formed in an intermediate portion in the axial direction, and the inner diameter dimension thereof is slightly increased over the predetermined length of the upper portion thereof.

  The projecting tip portion 118 of the connecting rod 78 is inserted into the insertion hole 104 of the armature 100 in a loosely inserted state, and the projecting tip portion 118 projects below the step surface 106 of the armature 100. Yes. The protruding tip portion 118 has a bolt structure, and a locking nut 120 as a locking member is screwed into the protruding tip portion 118 to constitute a locking portion. The outer diameter of the locking nut 120 is larger than the inner diameter of the step surface 106. When the locking nut 120 is locked to the step surface 106, the connecting rod 78 moves upward in the axial direction. It is considered impossible to escape. Here, the screwing position of the locking nut 120 with respect to the connecting rod 78 can be finely adjusted by the screwing amount of the locking nut 120 with respect to the connecting rod 78, and a fixed nut screwed from below the locking nut 120. By 122, the locking nut 120 is prevented from rotating, and the screwing position of the locking nut 120 can be fixedly set.

  As shown in FIG. 2, the outer peripheral edge of the connecting rod 78 and the small diameter part 108 of the armature 100 and the outer peripheral edge and the large diameter part 110 of the locking nut 120 are arranged with predetermined gaps α and β, respectively. The connecting rod 78 is displaceable in the direction perpendicular to the axis with respect to the armature 100. The relative allowable displacement in the direction perpendicular to the axis of the connecting rod 78 with respect to the armature 100 is determined by the smaller one of the gaps α and β. In this embodiment, the gap α is Therefore, it is determined by the size of the gap between the outer peripheral edge portion of the connecting rod 78 and the small diameter portion 108 of the armature 100. In addition, as an allowable displacement amount, the range of 0.2 mm-3 mm is employ | adopted suitably.

  An urging rubber 124 as a rubber-like urging body is provided between the facing surfaces of the armature 100 and the connecting fitting 34. The urging rubber 124 is integrally formed with the diaphragm 32 so that the diaphragm 32 enters the recess 83 of the connection fitting 34. Further, a buffer rubber portion 125 is integrally formed in the vicinity of the peripheral wall portion 85 of the recess 83 so as to cover the peripheral wall portion 85, and the periphery of the connecting rod 78 is made thicker toward the armature 100. The contact portion 127 is formed. The urging rubber 124 is disposed in a slightly compressed state between the connection fitting 34 and the armature 100, and always exerts an urging force toward the separation direction on the connection fitting 34 and the armature 100. Yes. As described above, the latching nut 120 is overlapped with the stepped surface 106 of the armature 100 and elastically held by the biasing rubber 124, and the connecting rod 78 protrudes from the armature 100 toward the vibration plate 48. An urging means for positioning and holding is configured. Therefore, the connecting rod 78 is capable of sliding displacement in the direction perpendicular to the axis with respect to the armature 100.

  In addition, a stopper mechanism is configured by the shock absorbing rubber portion 125, and the peripheral wall portion 85 of the connecting metal fitting 34 is brought into contact with the armature 100 via the shock absorbing rubber portion 125, and the armature 100 of the vibration plate 48. The amount of movement in the approaching direction is limited in a buffering manner, and the occurrence of a hitting sound at the time of contact is also reduced.

  Here, the urging rubber 124 and the buffer rubber portion 125 are not necessarily formed integrally with the diaphragm 32, and may be formed separately from the diaphragm 32 with a different material. The degree of freedom in setting the spring characteristics can be improved. Further, when the urging rubber 124 and the buffer rubber portion 125 are attached, it is not always necessary to attach them by adhesion, and they may be attached by simply fitting them. Furthermore, the urging rubber 124 does not necessarily have to be formed on the connecting metal fitting 34 side, and may be formed on the armature 100 side. The specific shape is not particularly limited, and for example, the contact protrusion 127 may be formed in a shape divided at a plurality of locations on the circumference without being continuously formed over the entire circumference. good.

  Under such an assembled state, the armature 100 is elastically positioned and held by the spring characteristic of the support rubber elastic body 46 in the mount body 17. Under such a state, the urging force of the urging rubber 124 urges the armature 100 and the connecting rod 78 away from each other, and a reaction force is obtained at the contact portion between the armature 100 and the linking rod 78. Since the urging rubber 124 is disposed between the armature 100 and the connecting fitting 34, the reaction rubber does not act on the support rubber elastic body 46, so the durability of the support rubber elastic body 46 is a problem. It will never be. When the main rubber elastic body 16 is elastically deformed by the shared support load of the power unit input between the first mounting bracket 12 and the second mounting bracket 14 with the engine mount 10 mounted on the vehicle. In addition, since the volume change generated in the working fluid chamber 54 is absorbed by the equilibrium chamber 56, the position of the vibration plate 48 and the position of the armature 100 is hardly affected, but due to the characteristics of the diaphragm 32 and the like. If the position of the armature 100 changes slightly, the change is taken into account and the amount of screwing of the locking nut 120 as shown in FIG. It is also possible to adjust the position so that an effective driving force is exerted.

  Although not shown, the engine mount 10 having the structure as described above can control the energization of the coil 86. For example, the engine ignition signal of the power unit is used as a reference signal and vibration is prevented. The energization control can be performed by performing feedback control such as adaptive control using the vibration detection signal of the power member as an error signal, or by using map control based on preset control data. As a result, by applying a magnetic force to the armature 100 and driving it to vibrate in the axial direction, a driving force corresponding to the vibration to be vibrated is applied to the vibration plate 48, thereby causing the working fluid chamber 54 to move. An active vibration isolation effect can be obtained by controlling the internal pressure.

  Therefore, in the engine mount 10 of the present embodiment, the connecting rod 78 protruding from the vibration plate 48 with respect to the armature 100 of the electromagnetic driving means 84 is disposed so as to be capable of sliding displacement in the direction perpendicular to the axis. Therefore, a relative positional shift due to a dimensional error during assembly and a temporary positional shift during operation of the actuator are advantageously absorbed.

  That is, when the electromagnetic driving means 84 is driven, the transmission direction of the driving force from the armature 100 to the connecting rod 78 is alternately changed by the vibration operation, so that the locking nut 120 has a relatively large biasing force. Even when pressed against the step surface 106, the urging force instantaneously decreases due to the action of the inertial force at the location where the direction of the driving force changes. At that moment, using the elastic force of the support rubber elastic body 46, the connecting rod 78 is slid and displaced, and the alignment with the armature 100 can be advantageously performed.

  The armature 100 and the connecting rod 78 are also temporarily displaced due to irregular elastic deformation of the support rubber elastic body 46 or until the displacement is eliminated by the sliding displacement of the connecting rod 78. The inclination of the connecting rod 78 is allowed by the gap between the armature 100 and the elastic deformation of the urging rubber 124, thereby reducing or avoiding the action of the twisting load between the armature 100 and the inner yoke 92. Thus, the stability and durability of the operation of the armature 100 can be advantageously maintained. In particular, in the present embodiment, the upper opening side of the small diameter portion 108 of the armature 100 is increased in diameter so that the inclination of the connecting rod 78 can be allowed more easily.

  Furthermore, since the connecting rod 78 is pressed not by a metal spring but by a rubber-like urging body, the occurrence of abnormal noise due to contact or rubbing with other members, galling or the like does not become a problem during elastic deformation, The quietness is improved and the generation of dust due to galling on other members is also advantageously avoided, thereby improving the durability.

  As mentioned above, although embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not interpreted limitedly by the specific description in this embodiment.

  For example, as in the second embodiment shown in FIG. 3, the connecting member 78 is configured by configuring the locking member by the rod-attached nut 126 and screwing the rod 128 to the rod 128 projected from the vibration plate 48. You may do it. In this embodiment, the lock bolt 130 is fitted into the nut 126 with the rod from the lower side in the axial direction, and the lock bolt 130 is brought into contact with the tip of the rod 128 in the screw hole of the nut 126 with the rod. As a result, the tightening position of the nut 126 with the rod relative to the rod 128 is locked. Also in this embodiment, the relative position of the vibration plate 48 and the armature 100 can be adjusted and set by adjusting the screwing amount of the nut 126 with the rod, which is a locking member, into the rod 128.

  However, in the present invention, the screwing structure of the locking member is not always necessary. For example, a large-diameter portion may be welded or caulked to the tip of the connecting rod 78, and the large-diameter portion may be engaged with the armature 100. According to such an aspect, the number of parts can be reduced, and assembly is also easy.

  Further, in these embodiments, the step surface 106 is formed inside the armature 100, and the drive rod 78 and the armature 100 are engaged inside the armature 100. As a result, the axial dimension is made compact while ensuring a sufficient volume of the output member, but such an engagement structure inside the armature 100 by the step surface 106 is not necessarily required. Then, the drive rod 78 may extend to the lower end surface of the armature 100, and the lower end surface of the armature 100 and the engaging member may be engaged.

  In any of the above embodiments, the diaphragm 32 is disposed below the main rubber elastic body 16, and the equilibrium chamber 56 is formed between the axial lower opening of the main rubber elastic body 16 and the diaphragm 32. However, the diaphragm 32 is disposed so as to cover the main rubber elastic body 16, and the equilibrium chamber 56 is formed on the opposite side of the working fluid chamber 54 with the main rubber elastic body 16 interposed therebetween. The present invention can also be applied to a vibration isolator or a vibration isolator having a structure in which the equilibrium chamber 56 is formed above the main rubber elastic body 16 as disclosed in JP-A-2001-12539. Is possible. According to these structures, the vibration plate 48 is directly exposed without the connection metal fitting 34 interposed therebetween. Therefore, the connection rod 78 is directly fixed to the vibration plate 48 and the vibration plate 48 is fixed. The urging rubber 124 may be attached, and the urging rubber 124 may be formed separately from the supporting rubber elastic body 46, or may be formed integrally with the supporting rubber elastic body 46. .

  The specific structures of the first and second orifice passages are appropriately changed according to the judgment of those skilled in the art depending on the required anti-vibration characteristics and the basic structure of the anti-vibration device, and are not limited in any way. It is not something.

  Further, although the coil 86 in the electromagnetic drive unit 84 is fixed by the housing 88 in this embodiment, it may be fixed directly to the second mounting member 14 without using the housing 88, for example.

  Furthermore, the specific shapes of the armature 100 and the yoke member in the electromagnetic drive means 84 are not limited. For example, the axial height of the inner yoke 92 is set to the same height as that of the outer yoke portion 90. The radially projecting portion 101 of the armature 100 may be projected downward in the axial direction so as to enter between the opposed surfaces of the inner yoke 92 and the outer yoke portion 90, or the inner peripheral surface of the lower end portion of the housing 88 is radially inward. The magnetic path may be formed so that the magnetic pole is formed there, and a magnetic gap may be formed between the magnetic pole and the lower end surface of the armature 100.

  Further, a low-friction sliding sleeve or the like may be interposed at the sliding portion between the inner peripheral surface of the through hole 96 of the housing 88 and the outer peripheral surface of the armature 100.

  In addition, the present invention relates to an anti-vibration device such as a body mount or member mount for automobiles, or a mount or a vibration damper in various devices other than automobiles, and an anti-vibration actuator used in such an anti-vibration device. On the other hand, the same applies.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is a longitudinal section showing an engine mount as a first embodiment of the present invention. It is a principal part enlarged view of the engine mount shown in FIG. It is a longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine mount 12 1st mounting bracket 14 2nd mounting bracket 16 Main body rubber elastic body 32 Diaphragm 48 Excitation plate 54 Working fluid chamber 78 Connection rod 86 Coil 88 Housing 100 Armature 106 Step surface 120 Locking nut 122 Fixing nut 124 Energizing rubber

Claims (8)

The first mounting member and the second mounting member are connected by a main rubber elastic body, and a part of the wall portion is configured by the main rubber elastic body to enclose the incompressible fluid, thereby the first mounting member. Forming a vibration action chamber in which pressure fluctuations are generated based on elastic deformation of the main rubber elastic body when vibration is input between the member and the second mounting member; and another wall portion of the vibration action chamber A part of the vibration plate is configured so that the vibration plate is elastically supported by the support rubber elastic body so as to be displaceable with respect to the second mounting member. An active fluid-filled vibration isolator in which an actuator for controlling the pressure of the vibration action chamber by oscillating and displacing a plate is disposed on the opposite side of the vibration action chamber with the vibration plate interposed therebetween.
The coil is fixedly attached to the second attachment member, and an armature is incorporated in the hollow hole of the coil so as to be displaceable in the axial direction, and the armature vibrates the vibration plate by energizing the coil. The actuator is configured to be driven and displaced in the displacement direction, while a drive rod is projected from the vibration plate toward the armature and an insertion hole extending in the axial direction with respect to the armature is provided. Then, the drive rod is inserted into the insertion hole in a loosely inserted state, and is locked to the armature at the protruding tip portion of the drive rod to prevent the drive rod from coming out of the armature to the vibration plate side. A locking portion is provided, and a rubber-like biasing body is disposed between the vibration plate and the armature, and the locking portion is pressed against the armature by a biasing force of the rubber-like biasing body. Wherein the biasing means is pressed against so resiliently acceptable the direction perpendicular to the axis of sliding displacement positioning and holding the drive rod in a state of protruding toward the the pressurized oscillating plate from the armature it is incorporated into the actuator An active fluid-filled vibration isolator.
  The locking portion is configured by screwing a locking member to the driving rod protruding from the vibration plate, and by adjusting the screwing position of the locking member with respect to the driving rod. The active fluid-filled vibration isolator according to claim 1, wherein a locking position of the locking member with respect to the drive rod can be changed and set in an axial direction of the drive rod.   3. A step surface is formed at an axially intermediate portion of the insertion hole in the armature, and the locking portion is superimposed on the step surface and locked so as to be displaceable in a direction perpendicular to the axis. An active fluid-filled vibration isolator as described in 1.   The allowable displacement amount in the direction perpendicular to the axis of the drive rod with respect to the insertion hole is set so that the relative allowable displacement in the direction perpendicular to the axis of the drive rod with respect to the armature is within a range of 0.2 mm to 3 mm. The active fluid-filled type vibration damping device according to any one of claims 1 to 3, wherein an allowable displacement amount in a direction perpendicular to an axis at a sliding displacement allowable portion of the stop portion with respect to the armature is set.   5. A recess that opens toward the armature is formed in the vibration plate, and the rubber-like biasing body is disposed in the recess and protrudes toward the armature. An active fluid-filled vibration isolator according to any one of the above.   A buffer rubber is formed on the surface of the vibration plate facing the armature of the peripheral wall portion of the recess, and the vibration plate is brought into contact with the armature through the buffer rubber. The active fluid-filled type vibration damping device according to claim 5, wherein a stopper mechanism for bufferingly limiting an amount of movement of the armature toward the approach side is configured.   A flexible membrane is disposed on the opposite side of the vibration working chamber across the supporting rubber elastic body, and an incompressible fluid is sealed between the opposing surfaces of the supporting rubber elastic body and the flexible membrane. A variable volume equilibration chamber is formed, an orifice passage for connecting the equilibration chamber to the vibration working chamber is formed, and an inverted cup-shaped fixing opening toward the armature is formed in the central portion of the flexible membrane. A bracket is provided, the fixing bracket is fixed to the vibration plate, the drive rod protrudes from a central portion of the fixing bracket, and the recess is formed by the fixing bracket. The active fluid-filled vibration isolator according to claim 5 or 6, wherein the rubber-like biasing body is disposed there. The second mounting member has a substantially cylindrical shape with a large diameter, and the first mounting member is disposed so as to be spaced apart from one axial side of the first mounting member. One opening in the axial direction of the second mounting member is fluid-tightly closed by the main rubber elastic body elastically connecting the member and the second mounting member, and the other opening of the second mounting member The support rubber elastic body is elastically supported by the flexible plate so that the vibration plate is elastically supported so as to be partitioned at both sides in the axial direction at an axially intermediate portion of the second mounting member. The vibration working chamber is formed on one side of the support rubber elastic body and the equilibrium chamber is formed on the other side, and is fixed to the flexible membrane. Further, the fixing metal fittings are superposed on and secured to the vibration plate. The drive rod protrudes outward from the fixture on the central axis of the second mounting member, and the coil is disposed on the other opening side of the second mounting member. The active fluid sealing according to claim 7, wherein the vibration plate is supported by the second mounting member and is connected to the armature incorporated in the coil by the drive rod. Type vibration isolator.

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