JP3997429B2 - 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, when the vibration plate and the armature are connected in a relatively misaligned state, the armature is assembled in an inclined state, and when an excitation force is exerted in this state, it is driven in the axial direction of the connecting rod. In addition to the fact that no force is exerted and the transmission efficiency of the driving force becomes poor, there is a possibility that a moment is exerted and the vibration plate is irregularly deformed. Furthermore, if the connecting rod is connected to the armature so as to be able to swing, there is a possibility that the necking will repeatedly occur when the vibration plate is vibrated, resulting in a resonance state and an increase in displacement of the swing. In addition, vibration and abnormal noise may become a problem as the neck displacement increases, and the actuator action and durability are hindered by the load action such as the twisting force on the sliding part of the armature. There was a fear.

  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. An active fluid-filled vibration isolator having a novel structure that can stably and efficiently apply the vibration driving force from the actuator to the vibration plate from the armature. It is to provide.

  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 actuator is configured by disposing a coil on the opposite side of the vibration working chamber across the vibration plate and supporting it with the second mounting member, and incorporating an armature into the hollow hole of the coil so as to be displaceable in the axial direction. At the same time, the armature is connected to the vibration plate to energize the coil. In the active fluid-filled vibration isolator which controls the pressure of the vibration action chamber by applying a driving force from the armature to the vibration plate to cause the vibration plate to be displaced by vibration. It is characterized by being attached to and supported by the second mounting member so as to allow slip displacement in the direction perpendicular to the axis while substantially preventing the axial displacement.

  In the active fluid-filled vibration isolator constructed according to this aspect, the actuator coil is allowed to slide in the direction perpendicular to the axis, so that the armature incorporated in the hollow hole of the coil is coupled with the coil. The mounting member can be displaced in a direction perpendicular to the axis. As a result, the relative position between the armature and the vibration plate that is directly or indirectly supported by the second mounting member due to superimposition of dimensional error of each member or variation in position on the assembly. Even when the displacement is relatively large, the relative displacement in the direction perpendicular to the axis (the direction perpendicular to the displacement direction) between these two members is absorbed by the slip displacement of the coil. Assembling can be easily performed while suppressing the relative inclination of each axis of the armature. Further, since the relative inclination of the shafts of the vibration plate and the armature can be suppressed and assembled, the vibration force of the armature can be stably and efficiently applied to the vibration plate. It is.

(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 second mounting member forms a support surface extending in the direction perpendicular to the axis on the outer peripheral side of the coil, A rigid coil housing is fixed to the coil so that the coil housing is superposed on the support surface of the second mounting member, and the coil housing can be allowed to slide relative to the support surface. An urging means for elastically pressing and positioning is provided.

  In the active fluid-filled vibration isolator having the structure according to this aspect, the coil is supported by the support surface formed on the second mounting member, so that the coil can be stably attached to the vibration isolator. Can be assembled. Furthermore, since the coil housing is pressed by the urging means, the backlash of the actuator is reduced, and the operational stability and durability are improved. Here, various urging means can be employed, for example, not only metal elastic bodies such as leaf springs and coil springs, but also various natural rubbers and artificial rubbers, elastomer materials made of synthetic resin materials, etc. It is also possible to use a rubber-like elastic body.

(Aspect 3 of the present invention)
According to a third aspect of the present invention, in the active fluid-filled vibration damping device according to the first or second aspect, the armature and the vibration plate are connected to each other by extending between opposing surfaces of the armature and the vibration plate. And a connecting position adjusting means capable of changing and setting the connecting position of the connecting rod with respect to the armature and / or the vibration plate in the longitudinal direction of the connecting rod. .

  In the active fluid-filled vibration isolator constructed according to this aspect, the connection position of the connecting rod with respect to the armature and / or the vibration plate is changed and set in the axial direction of the connection rod. It is possible to easily and accurately adjust the relative position in the axial direction. 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 connecting position adjusting means may be any means that can change and set the connecting position of the connecting rod with the armature and / or the vibration plate in the longitudinal direction. There is no limitation on the structure. For example, the connecting portion of the connecting rod may be configured with a screwing structure so that the connecting position can be adjusted by the amount of screwing, or an appropriate spacer or shim may be incorporated into the connecting portion.

(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, the armature and the vibration plate are extended between opposing surfaces of the armature and the vibration plate. A connecting rod for connecting to each other is provided, and the connecting rod is connected to the armature and / or the vibration plate in a swingable manner.

  In the active fluid-filled vibration isolator configured according to this aspect, the connecting rod is connected to the armature and / or the vibration plate so as to be able to swing, so that the shaft of the vibration plate and the armature can be connected. A relative positional shift in the perpendicular direction can be absorbed more effectively. In the present invention, since the coil is slidable in a direction perpendicular to the axis, the inclination of the shaft of the vibration plate and the armature is absorbed by the sliding displacement, and the neck swing structure is adopted. However, it is avoided that the displacement of the neck swing becomes larger than necessary, and the neck swing structure of the connecting rod can be employed more effectively. The operational stability and durability of the actuator can be improved.

(Aspect 5 of the present invention)
According to a fifth aspect of the present invention, in the active fluid filled type vibration damping device according to any one of the first to fourth aspects, the support position of the coil on the second mounting member is set in the axial direction of the coil. The present invention is characterized in that a coil position adjusting means that can be changed and set is provided. In the active fluid filled type vibration isolator having the structure according to this aspect, the relative position in the axial direction between the coil and the armature can be finely adjusted, and the vibration isolation characteristics of the active fluid filled type vibration isolator are provided. Can be adjusted and set with higher accuracy.

(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 any one of the first to fifth aspects, the second mounting member has a large-diameter, generally cylindrical shape, The first mounting member is disposed to be spaced apart from one opening side in the axial direction, and the second rubber member is elastically connected to the second mounting member by the main rubber elastic body. One opening in the axial direction of the mounting member is closed fluid-tightly, and the other opening of the second mounting member is fluid-tightly closed by a flexible membrane. The support rubber elastic body is provided to elastically support the vibration plate so as to be partitioned on both axial sides at an axial intermediate portion of the member, and the vibration working chamber is disposed on one side of the support rubber elastic body. The volume is variable with a part of the wall made of the flexible membrane on the other side While the equilibrium chamber is formed, a fixing bracket is fixed to the central portion of the flexible film, and the fixing bracket is overlapped and fixed to the vibration plate, and the second mounting member The coil is disposed on the other opening side of the coil and is supported by the second mounting member, and a connecting rod for connecting the vibration plate to the armature incorporated in the coil is provided. And the driving force of the armature is applied to the vibration plate.

  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 the first to fifth aspects 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 constructed according to the present invention, the coil is allowed to slide in the direction perpendicular to the axis with respect to the second mounting member. Because it is supported, it can be easily assembled even if there is a variation in the relative position of the armature with respect to the vibration plate, and the drive force by the actuator can be stably and efficiently applied to the vibration plate. It will be possible to affect.

  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, and an upper step surface 64 and a lower step surface 67 are formed such that the inner peripheral surface of the central portion in the axial direction protrudes inward. A stopper fitting 66 is bolted to the upper end surface of the bracket 19. 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, a stopper 68 is fitted into the lower opening of the bracket 19 and is locked by the lower step surface 67. The stopper metal 68 has an annular plate shape with an inner diameter that slightly protrudes inward from the inner peripheral surface of the lower step surface 67 of the bracket 19. Further, a large-diameter support screw hole 79 is engraved on the lower inner peripheral surface of the bracket 19 with a length that does not reach the stopper 68 from the lower opening end.

  The second mounting bracket 14 fitted into the bracket 19 is supported by the upper step surface 64 and is sandwiched and fixed by the flange portion 70 of the stopper bracket 66 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. A drive rod 78 as a connecting rod is fixed to the vibration plate 48 and the connection fitting 34, and the drive 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 coupling fitting 34 are overlapped at the respective upper bottom portions in the center, and a caulking portion 82 formed integrally with the upper end portion of the drive rod 78 is inserted through these central portions. By virtue of the caulking portion 82, the vibration plate 48 and the coupling fitting 34 are caulked and fixed in close contact, and the drive 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.

  In the vicinity of the peripheral wall portion 85 of the recess 83, a buffer rubber portion 125 is integrally formed with the diaphragm 32 so as to cover the peripheral wall portion 85. A stopper mechanism is configured by the buffer 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 buffer rubber portion 125, so that the vibration plate 48 is attached to the armature 100. 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 reduced. The buffer rubber portion 125 may be formed separately from the diaphragm 32 and attached by bonding or fitting.

  Further, an electromagnetic drive means as an actuator is provided on the lower side in the axial direction of the second mounting bracket 14 from which the drive rod 78 is projected, that is, on the opposite side of the working fluid chamber 54 across the vibration plate 48 and the coupling bracket 34. 84 is disposed and supported by the second mounting member 14 via the bracket 19.

  The electromagnetic driving means 84 includes a coil 86 and a rigid housing 88 that is 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 portion of the outer yoke portion 90 to the outer periphery. Then, the housing 88 is inserted from the lower opening of the bracket 19, and the annular fixing portion 94 is locked by the stopper metal 68 via the leaf spring 95 as the biasing means, and from below. The coil 86 is positioned in the axial direction by being supported by the support nut 99. Here, the support nut 99 is screwed into the support screw hole 79 of the bracket 19, and the support surface 102 is constituted by the upper surface of the support nut 99, and the annular fixing portion 94 is attached to the support surface 102 by the leaf spring 95. It is pressed against. Further, since the annular fixing portion 94 is formed to have an outer diameter smaller than the inner diameter of the support screw hole 79, a predetermined gap is formed between the inner peripheral surface of the support screw hole 79 and the annular fixing portion 94. A gap is formed and supported so as to be displaceable in the direction perpendicular to the axis, and the allowable displacement in the direction perpendicular to the axis is limited by the inner peripheral surface of the bracket 19. Further, a detent nut 103 is screwed below the support nut 99, thereby preventing the support nut 99 from rotating and setting the position of the support nut 99 in the axial direction. As a result, the coil 86 is supported by the second mounting member 14 via the bracket 19 and the support nut 79. 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.

  Then, the projecting tip portion 118 of the drive rod 78 is inserted in 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 is screwed thereto. The outer diameter of the locking nut 120 is larger than the inner diameter of the step surface 106, and when the locking nut 120 is locked to the step surface 106, the drive 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 drive rod 78 can be finely adjusted by the screwing amount of the locking nut 120 with respect to the driving rod 78, and a fixed nut screwed from the lower side of the locking nut 120. The locking nut 120 is prevented from rotating by 122 so that the screwing position of the locking nut 120 can be fixedly set, and the connection position of the drive rod 78 to the armature 100 and / or the vibration plate 48 is fixed. The connecting position adjusting means is configured to change the setting in the longitudinal direction of the drive rod 78.

  Further, as shown in FIG. 2, the outer peripheral edge of the drive 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 drive rod 78 is displaceable in the direction perpendicular to the axis with respect to the armature 100. The relative permissible displacement in the direction perpendicular to the axis of the drive rod 78 with respect to the armature 100 is determined by the smaller one of the gaps α and β. Therefore, it is determined by the size of the gap between the outer peripheral edge portion of the drive 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. If the lid is covered and the allowable displacement is too small, the relative displacement between the vibration plate and the armature in the direction perpendicular to the axis may not 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. This is because the driving reaction force exerted from the rod becomes an eccentric load with respect to the armature, and the stability of the operation may be lowered.

  In order to better realize the sliding displacement between the locking nut 120 and the armature 100, a sliding member made of a low friction material such as polyethylene or polytetrafluoroethylene may be incorporated in these sliding surfaces. Further, a low friction process may be performed on the sliding surface between the locking nut 120 and the stepped surface 106 of the armature 100.

  A coil spring 124 is incorporated in the accommodation space 114 of the armature 100. The coil spring 124 has an outer diameter dimension substantially equal to the outer diameter dimension of the locking nut 120 and is disposed in a compressed state between the bottom cover 112 and the locking nut 120. Thus, an urging force directed upward in the axial direction is always applied. As a result, the locking nut 120 is overlaid on the stepped portion 106 of the armature 100 and is elastically held in this overlaid state. Therefore, the connecting rod 78 can be displaced in a direction perpendicular to the axis with respect to the armature 100 and can be displaced in the neck relative to the armature 100. The coil spring 124 is preferably processed so as to reduce the generation of dust due to rubbing with the locking nut 120. Therefore, a closed-end end structure is preferable to the open end, and the coil spring 124 is not ground. Also, those subjected to grinding or taper end treatment are preferably employed.

  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 this condition, a reaction force is obtained at the contact portion between the armature 100 and the connecting rod 78 by the urging force of the coil spring 124, but the coil spring 124 is disposed in the accommodation space 114 of the armature 100. Therefore, since the reaction force applied to the support rubber elastic body 46 does not act, the durability of the support rubber elastic body 46 does not become a problem. Further, since the armature 100 in which the coil spring 124 is incorporated is not directly fixed to the housing 88 of the coil 86 and the second mounting bracket 14, the vibration housing 88 and the first vibration due to the deformation of the coil spring 124. The transmission to the second mounting bracket 14 is suppressed, and the occurrence of abnormal noise or the like does not become a problem.

  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.

  Furthermore, in this embodiment, the coil position adjustment which can adjust and set the support position in the 2nd attachment bracket 14 of the coil 86 in the axial direction of the coil 86 by adjusting the screwing amount to the bracket 19 of the support nut 99. Means are configured. By adjusting the screwing amount of the support nut 99, the relative position between the coil 86 and the armature 100 can be finely adjusted, and the position adjustment with higher accuracy can be performed.

  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 coil 86 in the electromagnetic drive means 84 is disposed so as to be slidable in the direction perpendicular to the axis, so that the vibration plate 48 due to a dimensional error during assembly can be obtained. The relative displacement in the direction perpendicular to the armature 100 is advantageously absorbed by the axial displacement of the coil 86.

  In addition, temporary positional deviations when the actuator is operated 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 driving rod 78 is alternately changed by the vibration operation, so that the locking nut 120 has a relatively large urging 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 drive rod 78 is slid and displaced, and the alignment with the armature 100 can be advantageously performed.

  The armature 100 and the drive 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 drive rod 78. And the elastic deformation of the coil spring 124 allows the neck displacement of the drive rod 78 to be allowed. Even when the drive rod 78 is tilted, the tilt of the drive rod 78 is not exerted on the armature 100. The operational stability and durability of 100 can be advantageously maintained. In particular, in this embodiment, the diameter of the upper opening side of the small diameter portion 108 of the armature 100 is increased, so that the neck displacement of the drive rod 78 is allowed more easily.

  Further, in addition to being able to effectively absorb the relative displacement between the vibration plate 48 and the armature 100 in the direction perpendicular to the axis due to the displacement of the neck, in this embodiment, the coil 86 is slipped in the direction perpendicular to the axis. Displacement is allowed. As a result, such a positional deviation can be advantageously eliminated by the sliding displacement of the coil 86 in the direction perpendicular to the axis, and it is avoided that the neck displacement is increased more than necessary. This is because the neck displacement is increased. The transmission efficiency of the driving force to the vibration plate 48 of the armature 100 is deteriorated, the vibration plate 48 may be irregularly deformed due to the moment applied to the vibration plate 48, and the displacement of the neck swing is in a vibration state. Problems such as abnormal noise and vibration can be advantageously avoided.

  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, FIG. 3 shows an engine mount 200 as a different embodiment. In the engine mount 200, a large-diameter coil spring 130 is used as an urging means for positioning and holding the housing 88 that fixes the coil 86. An engagement groove 132 is formed in the stopper metal 68, and a locking wall 134 that slightly protrudes upward is formed on the outer peripheral edge of the annular fixing portion 94. The engagement with the coil spring 130 is prevented from being released due to the displacement. In the present embodiment and other embodiments to be described later, the same structures and members as those in the first embodiment described above are denoted by the same reference numerals as those in the first embodiment in the drawings. Detailed description is omitted.

  Various urging means can be used. For example, not only these leaf springs and coil springs, but also various elastic rubbers such as elastomer materials made of synthetic resin materials in addition to various natural rubbers and artificial rubbers. A body or the like can also be employed.

  Further, the connection position adjusting means is not limited to the aspect of the above-described embodiment. For example, the locking nut 120 is constituted by a nut with a rod, and a rod-shaped bolt protruded from the vibration plate 48 is used. The drive rod 78 may be configured by screwing.

  However, in the present invention, the connecting position adjusting means between the drive rod 78 and the armature 100 and / or the vibration plate 48 is not always necessary. For example, as shown in FIG. 4, the drive rod 78 and the armature 100 may be integrally formed and fixed to the vibration plate 48. According to such an aspect, the number of parts can be reduced and the assembling work can be facilitated.

  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, since the vibration plate 48 is directly exposed without the connection metal fitting 34 interposed therebetween, the drive rod 78 may be directly fixed to the vibration plate 48.

  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.

  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 another embodiment of this invention. It is a longitudinal cross-sectional view which shows the engine mount as another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine mount 12 1st attachment metal fitting 14 Second attachment metal fitting 16 Main body rubber elastic body 19 Bracket 48 Excitation board 56 Equilibrium chamber 58 Pressure receiving chamber 60 Excitation chamber 68 Stop fitting 78 Drive rod 86 Coil 88 Housing 94 Annular fixed part 95 Leaf spring 99 Support nut 100 Armature 102 Support surface 103 Detent nut 120 Lock nut 122 Fixed nut 130 Coil spring

Claims (6)

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. On the other hand, the vibration chamber is opposite to the vibration plate. A coil is arranged on the side and supported by the second mounting member, and an armature is incorporated into the hollow hole of the coil so as to be displaceable in the axial direction, and the armature is connected to the vibration plate. The armature is driven from the armature to the vibration plate by energizing the coil. In the active type fluid-filled vibration damping device designed to pressure control shake operation for chamber by allowed to vibration displacement of the pressurized oscillation plate exerts a force,
An active type wherein the coil is attached to and supported by the second attachment member so as to allow slip displacement in a direction perpendicular to the axis while substantially preventing axial displacement of the coil. Fluid-filled vibration isolator.   In the second mounting member, a support surface extending in a direction perpendicular to the axis is formed on the outer peripheral side of the coil, and a rigid coil housing is fixed to the coil, and the coil housing is fixed to the second mounting member. 2. The active fluid sealing according to claim 1, further comprising: an urging unit that superimposes the coil housing on the support surface and elastically presses the coil housing against the support surface so as to allow sliding displacement. Type vibration isolator.   A connecting rod extending between opposing surfaces of the armature and the vibration plate is provided to connect the armature and the vibration plate to each other, and the connection position of the connection rod to the armature and / or the vibration plate is connected to the armature and the vibration plate. The active fluid-filled vibration isolator according to claim 1 or 2, further comprising connection position adjusting means that can be changed and set in the longitudinal direction of the rod.   A connecting rod that extends between opposing surfaces of the armature and the vibration plate and connects the armature and the vibration plate to each other is provided, and the connection rod can be swung with respect to the armature and / or the vibration plate. The active fluid-filled vibration isolator according to any one of claims 1 to 3, wherein the vibration isolator is connected to an active fluid.   The active fluid-filled vibration isolating apparatus according to any one of claims 1 to 4, further comprising a coil position adjusting unit that can change and set a support position of the coil in the second mounting member in an axial direction of the coil. apparatus. 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 that elastically supports the vibration plate so as to be partitioned on both sides in the axial direction at the axially intermediate portion of the second mounting member is disposed. The variable volume balance is formed in which the vibration working chamber is formed on one side of the support rubber elastic body and a part of the wall portion is formed of the flexible film on the other side. While the chamber is formed, a fixing bracket is fixed to the central portion of the flexible membrane, and the fixing bracket is In addition to being superposed on and fixed to the diaphragm, the coil is disposed on the other opening side of the second mounting member and supported by the second mounting member. 6. A connecting rod for connecting the vibration plate to the incorporated armature is provided, and a driving force of the armature is exerted on the vibration plate. Active fluid-filled vibration isolator.

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