JP4075062B2 - 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 bracket 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 deal with such a problem, for example, as disclosed in Patent Document 3, a connecting rod is connected to the armature so as to be able to swing, so that the relative displacement between the vibration plate and the armature can be dealt with. It is also possible. 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 the force is not applied and the transmission efficiency of the driving force to the vibration plate becomes poor, there is a possibility that a moment is applied 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. Furthermore, as the displacement of the neck swing increases, the occurrence of vibration and abnormal noise may become a problem, and the armature is tilted more greatly, due to the load action such as the twisting force on the sliding part of the armature, There was a risk of hindering the operation and durability of the actuator. In addition, when the metal spring is elastically deformed, if a rubber layer or a resin protective layer is attached to the support surface of the metal spring, they are likely to be scraped off to generate dust, and the generated dust will slide on the armature. There was also a possibility that the actuator could be hindered by entering the gap.

  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 constantly exerted on the supporting rubber elastic body, if the biasing force of the coil spring is increased, the settling of the supporting rubber elastic body may become a problem. When the urging force of the coil spring that is positioned with respect to the armature is small, the neck of the connecting rod is easily generated, and there is a possibility that the excitation operation becomes unstable. In addition, since the coil spring is supported by the housing, 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 actuator for pressure control shake operation for chamber by allowed to vibration displacement of the pressurized oscillation plate exerts a driving force to the oscillating plate, the active which is disposed on the opposite side with the vibrating working chamber across the pressurized oscillation plate In the fluid-filled vibration isolator, the coil is fixedly attached to the second mounting member. In addition, an armature is incorporated into the hollow hole of the coil so as to be displaceable in the axial direction, and the actuator is driven and displaced in the direction of vibration displacement of the vibration plate by energizing the coil. while constituting, while projecting the drive rod from the pressurized oscillation plate toward said armature, is provided an insertion hole extending in the axial direction with respect to the armature, perpendicular to the axis of the drive rod against the insertion hole The drive rod is inserted into the armature by the first biasing means and the second biasing means which are inserted in a state in which relative displacement in the direction is allowed and supported by being incorporated in the armature itself . The drive rod is elastically connected to the armature by urging in opposite directions in the axial direction.

  In the active fluid-filled vibration isolator constructed according to this aspect, the drive rod is perpendicular to the armature (direction perpendicular to the displacement direction) by the elastic deformation of the first and second biasing means. The relative displacement between the vibration plate and the armature is caused by superimposition of dimensional error of each member and variation in position on the assembly. Even if it occurs relatively large, these relative displacements are absorbed by the elastic deformation of the first and second urging means, so that it is easy to suppress the relative displacement between the drive rod and the armature. Assembling can be done. In addition, since the relative displacement between the drive rod and the armature can be suppressed and assembled, the armature's excitation force can be stably and efficiently applied to the drive rod. It is possible to vibrate stably and efficiently.

  Further, since the first and second urging means are incorporated in the armature, the reaction force of the urging force exerted on the drive rod by the first and second urging means is applied to the armature. Thus, it is avoided to act on the supporting rubber elastic body. As a result, the urging force of the first and second urging means can be sufficiently obtained, and the urging force does not act on the supporting rubber elastic body, so the durability of the supporting rubber elastic body becomes a problem. There is nothing. Moreover, since the first and second urging means are incorporated in the armature, dust generated by rubbing between the urging means and the drive rod and the armature enters the sliding gap of the armature and causes malfunction. The possibility of occurrence is avoided as much as possible. Furthermore, the armature incorporating the first and second biasing means is not directly fixed to the coil housing or the second mounting member. Transmission of vibration accompanying deformation to the coil housing and the second mounting member is suppressed, so that the generation of abnormal noise does not become a problem.

  Furthermore, since the actuator and the vibration plate are elastically connected, one vibration system is formed between the actuator and the vibration plate. Therefore, by actively using such a vibration system, that is, by tuning the natural frequency of such a vibration system to the vibration frequency to be actively vibration-isolated, the generated excitation force of the actuator can be more efficiently reduced. Can be increased and transmitted to the vibration plate.

(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, an attachment position relative to the armature in at least one of the first and second urging means can be changed and set in the axial direction. It is characterized by that.

  In the active fluid-filled vibration isolator constructed according to this aspect, the relative position between the armature and the drive rod is set by changing the mounting position of at least one of the first and second urging means relative to the armature. Thus, it is possible to adjust the axial relative position of the armature with respect to the vibration plate. As a result, for example, it is possible to accurately position the armature in the axial direction with respect to the coil, and to avoid initial deformation of the supporting rubber elastic body due to a static force exerted on the armature. This makes it possible to accurately adjust and set the vibration isolation characteristics of the fluid filled type vibration isolation device.

  In addition, in this aspect, there is no particular limitation on the specific structure for making it possible to change and set the attachment positions of the first and second urging means with respect to the armature. For example, the biasing means may be supported by a screw-type lid member for the armature, and the mounting position of the biasing means with respect to the armature may be changed by adjusting the screwing amount of the lid member, or the armature itself. The contact portion with the biasing means may be adjustable in height in the axial direction.

(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, the insertion hole penetrates in the axial direction in the armature, and the vibration plate side in the insertion hole The inner diameter dimension of the opening is larger than the inner diameter dimension of the opening opposite to the vibration plate.

  In the active fluid-filled vibration isolator having the structure according to this aspect, the drive rod can be greatly inclined with respect to the armature because the insertion hole on the vibration plate side of the armature is greatly opened. . As a result, the drive rod may be inclined relative to the armature, for example, when a positional deviation occurs temporarily between the vibration plate and the armature due to irregular elastic deformation of the support rubber elastic body. However, even in such a case, since the relative inclination of the drive rod with respect to the armature is widely allowed, the influence of the inclination of the drive rod on the armature is reduced. Operational stability and durability can be advantageously maintained.

(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 is inserted into the armature of the drive rod inserted into the insertion hole of the armature. square support portion is formed extending in the axis-perpendicular direction outward in the vicinity of the tip of the the first compression coil spring serving as the first biasing means so as to be located on both sides in the axial direction sandwiching the support portion By disposing a second compression coil spring as the second urging means, the urging force of the first urging means and the second urging means is applied to the support portion with respect to the shaft of the drive rod. The drive rods including the support portions are separated inward from the inner peripheral surface of the insertion hole so that displacement in a direction perpendicular to the axis is allowed in the insertion hole of the armature. And elastically supported And butterflies.

  In the active fluid-filled vibration isolator constructed in accordance with this embodiment, the drive rod inserted into the armature is allowed to be displaced relative to the armature in a direction perpendicular to the axis, and stable with respect to the armature. And it becomes possible to elastically support efficiently.

(Aspect 5 of the present invention)
According to a fifth aspect of the present invention, in the active fluid-filled vibration isolator according to any one of the first to fourth aspects, the second mounting member has a substantially cylindrical shape with a large diameter. The first mounting member is disposed apart from one opening in the axial direction, and the second rubber elastic body elastically connects the first mounting member and the second mounting member. One opening in the axial direction of the mounting member is fluid-tightly closed, and the other opening of the second mounting member is fluid-tightly closed with a flexible film, and the second mounting member The support rubber elastic body that elastically supports the vibration plate is provided so as to be divided on both axial sides at an axial middle portion of the vibration support chamber, and the vibration working chamber is disposed on one side of the support rubber elastic body. And a variable volume with a part of the wall made of the flexible membrane on the other side. An equilibration chamber is formed, and a fixing bracket is provided in the central portion of the flexible membrane, the fixing bracket is fixed to the vibration plate, and the drive rod is directed from the fixing bracket to the armature. It is characterized by being projected.

  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 any one of the first to fourth 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 drive rod protruding from the vibration plate is elastically connected to the armature. 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 vibration driving force by the actuator can be applied to the vibration plate stably and efficiently. It becomes.

  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, has an inner diameter dimension that slightly protrudes radially inward at the lower end opening of the bracket 19, and is fixed to the bracket 19 with a bolt.

  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. By virtue of the caulking portion 82, the vibration plate 48 and the connection fitting 34 are caulked and fixed in an intimate contact state, and the connection rod 78 penetrates the connection fitting 34 from the vibration plate 48 and faces outward. Projecting downward in the axial direction.

  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 penetrating in the center thereof, and a yoke portion 90 extending around the entire circumference in a U-shaped cross section so as to surround the outer peripheral surface and upper and lower end surfaces of the coil 86. The yoke portion 90 is made of a ferromagnetic material, and magnetic poles are formed at the upper and lower inner peripheral edge portions when the coil is energized. A cylindrical sliding sleeve 92 is assembled on the inner peripheral surface of the coil 86 so as to cover the openings at the upper and lower inner peripheral edge portions of the yoke portion 90. The sliding sleeve 92 has a smooth inner peripheral surface with an inner diameter that slightly protrudes from the magnetic pole inner surface of the yoke portion 90, and is formed of a low friction material such as polyethylene or polytetrafluoroethylene.

  On the other hand, the housing 88 is formed with an annular fixing portion 94 extending from the upper end portion of the 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 circular block-shaped ferromagnetic material as a whole, has an outer diameter slightly smaller than the inner diameter of the sliding sleeve 92, is fitted into the sliding sleeve 92, and is substantially the same as the coil 86. It is assembled so as to be capable of relative displacement in the axial direction on the same central axis. Furthermore, the armature 100 has an axial length dimension that straddles the upper and lower magnetic poles of the yoke portion 90, and a circumferential groove that is opened on the outer peripheral surface is formed near the upper magnetic pole portion. A circumferential gap is filled with a non-magnetic material 102 such as a synthetic resin material, and a magnetic gap in which an effective magnetic attractive force is applied to the upper magnetic pole portion is adjusted and formed. For example, as shown in the drawing, between the axial lower end edge of the armature 100 with respect to the yoke portion 90 and the lower magnetic pole of the yoke portion 90, and the upper end edge of the circumferential groove of the armature 100 and the upper magnetic pole of the yoke portion 90 In the meantime, an effective magnetic attractive force can be applied to each of them.

  The armature 100 is formed with an insertion hole 104 that passes through the central axis. The insertion hole 104 has an intermediate portion in the axial direction as a step surface 106, an upper side in the axial direction sandwiching the step surface 106 as a large diameter portion 108, and a lower portion in the axial direction as a small diameter portion 110. The opening size on the side of the vibration plate 48 is made larger than the opening size on the side opposite to the vibration plate 48. In particular, in the present embodiment, the opening on the vibration plate 48 side in the large-diameter portion 108 is an upper opening 112 having a larger inner diameter.

  The connecting rod 78 is inserted in the insertion hole 104 of the armature 100 in a loosely inserted state, and the support portion 118 formed at the tip portion reaches the axial center of the large diameter portion 108 of the armature 100. It is inserted up to. The support portion 118 has a substantially thin plate shape extending in the direction perpendicular to the axis, and is formed at the distal end portion of the connecting rod 78 with an outer diameter size slightly smaller than the inner diameter size of the large diameter portion 108.

  Here, the support portion 118 of the connecting rod 78 includes a first coil spring 120 as a first urging means disposed above the support portion 118 and a first coil spring 120 disposed below the support portion 118. The second coil spring 122 as the second urging means exerts an urging force that is opposite in the axial direction, that is, downward in the axial direction by the first coil spring 120 and upward in the axial direction by the second coil spring 122. Yes. The connecting rod 78 is elastic in a state having a predetermined gap with respect to the armature 100 due to a balance of urging forces exerted in the opposite axial directions by the first and second coil springs 120 and 122. It is connected. The first coil spring 120 and the second coil spring 122 are preferably processed so as to reduce the generation of dust due to rubbing with the abutting member, and therefore, the closed end structure is preferable to the open end. In addition, a material that has been subjected to grinding or taper end treatment is preferably employed rather than non-grinding.

  A peripheral wall portion 124 extending in the vertical direction is formed on the outer peripheral edge portion of the support portion 118, and the first and second coil springs 120, 122 superimposed on the upper and lower surfaces of the support portion 118 are the peripheral wall portion 124. By being positioned, dropping from the support portion 118 is prevented. Further, the peripheral wall portion 124 of the support portion 118 is disposed with a predetermined distance in the radial direction over the entire circumference with respect to the inner peripheral surface of the insertion hole 104 of the armature 100, and the armature 100 of the connecting rod 78. Relative displacement in the direction perpendicular to the axis of the armature 100 is allowed, and the support portion 118 abuts against the inner peripheral surface of the insertion hole 104 of the armature 100, thereby causing excessive displacement of the connecting rod 78 in the direction perpendicular to the axis of the armature 100. Is now restricted.

  In the present embodiment, the first coil spring 120 has its lower end engaged with the upper surface of the support portion 118 of the connecting rod 78, and its upper end assembled to the upper end surface of the armature 100. It is locked by a locking metal fitting 126 and assembled in a state compressed by a predetermined amount in the axial direction. The locking metal fitting 126 has a thin annular plate shape having an inner diameter dimension slightly smaller than the inner diameter dimension of the upper opening 112 of the armature 100, and is bolted to the upper end surface of the armature 100. The inner diameter dimension of the locking fitting 126 that substantially constitutes the upper opening of the insertion hole 104 of the armature 100 is made larger than the inner diameter dimension of the small diameter section 110 on the lower side in the axial direction in the insertion hole 104.

  On the other hand, the second coil spring 122 has its upper end locked to the lower surface of the support portion 118 of the connecting rod 78, while its lower end is supported by a support nut 128 screwed to the armature 100. It is assembled in a state compressed by a predetermined amount in the axial direction. Here, a screw hole 130 is formed in the small diameter portion 110 of the armature 100, and a support nut 128 is screwed into the screw hole 130, and the second coil spring 122 is supported by the support nut 128. ing. The screwing position of the support nut 128 can be finely adjusted by the screwing amount with respect to the armature 100, and the support nut 128 is prevented from rotating by the detent nut 132 screwed from the lower side of the support nut 128. The screwing position can be fixedly set. Thus, the mounting position of the second coil spring 122 with respect to the armature 100 can be changed and set in the axial direction by the support nut 128 and the locking nut 132, and thus the axial direction of the connecting rod 78 with respect to the armature 100 can be changed. The relative position can be changed.

  Under such an assembled state, the armature 100 is elastically formed by the spring characteristics of the support rubber elastic body 46 in the mount body 17 connected to the first and second coil springs 120 and 122 via the connecting rod 78. Positioning is held. Under such a state, the relative positions of the connecting rod 78 and the armature 100 are determined by the balance of the urging forces that the first coil spring 120 and the second coil spring 122 respectively exert on the connecting rod 78 in the opposite directions in the axial direction. Yes. The armature 100 is subjected to such counter reaction force, and both the first and second coil springs 120 and 122 are incorporated in the armature 100, and the first and second coil springs 120 and 122 are incorporated. These supporting reaction forces are exerted in the axial direction of the armature 100 as forces opposite to each other. Therefore, under the static state, it is avoided that the urging forces of the first and second coil springs 120 and 122 are exerted on the support rubber elastic body 46, and the preload on the support rubber elastic body 46 is prevented. The problem of durability such as settling caused is avoided.

  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. When the position of the armature 100 changes slightly, an effective driving force is exerted on the armature 100 by adjusting the screwing amount of the support nut 128 described above in consideration of the change. It is also possible to adjust the position.

  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 is not fixedly connected to the armature 100, and the relative displacement in the direction perpendicular to the axis between these members 78 and 100 is the first coil. The spring 120 and the second coil spring 122 are allowed to be elastically deformed. Therefore, a relative positional shift due to a dimensional error when assembling each part in the manufacturing process of the engine mount 10 and a temporary positional shift when the actuator is operated are advantageously absorbed.

  That is, when the electromagnetic driving means 84 is driven, the movement direction of the connecting rod 78 changes alternately in the vertical direction, so that a relatively large biasing force is applied by the first and second coil springs 120, 122. Even when applied between the armature 100 and the armature 100, when the direction of motion is reversed, the urging force is instantaneously reduced by the action of the inertial force. At that moment, the connecting rod 78 is displaced in the direction perpendicular to the axis by utilizing the elastic force in the direction perpendicular to the axis of the support rubber elastic body 46, and the armature 100 can be automatically aligned.

  The armature 100 and the connecting rod 78 may be temporarily displaced due to irregular elastic deformation of the support rubber elastic body 46 or until the displacement is eliminated by the displacement of the connecting rod 78. And the first and second coil springs 120 and 122 are elastically deformed to allow the connecting rod 78 to be tilted, thereby reducing the effect of the twisting load between the armature 100 and the sliding sleeve 92. The stability and durability of the armature 100 can be advantageously maintained. In particular, in the present embodiment, the connecting rod 78 is more easily inclined by increasing the diameter of the upper opening 112 that is the opening on the side of the vibration plate 48 of the armature 100. Further, since the support portion 118 of the connecting rod 78 is supported inside the armature 100, in addition to being made compact in the axial direction, the central axis of the tilt displacement of the connecting rod 78 with respect to the armature 100 is achieved. Is positioned substantially at the center of the armature 100, the moment exerted on the armature 100 due to the inclination of the connecting rod 78 is reduced as compared with the case where the central axis is positioned above or below the connecting rod 78. The inclination of the armature 100 is avoided as much as possible.

  Furthermore, since both the first and second coil springs 120 and 122 are incorporated in the armature 100, vibrations due to elastic deformation of the first and second coil springs 120 and 122 are caused by the housing 88 and The occurrence of abnormal noise is avoided or reduced without affecting the second mounting bracket 14.

  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, the specific structures and materials of the first and second urging means are not particularly limited, and the first embodiment as in the engine mount 200 as the second embodiment shown in FIG. It is also possible to use a leaf spring 134 instead of the first coil spring 120 in FIG. Alternatively, it is possible to employ not only these metal springs, but also rubber-like urging bodies such as various natural rubbers, artificial rubbers, and elastomer materials made of synthetic resin materials, as shown in the engine mount 200. Of course, the first and second urging means can be formed of different types of structures or materials. Further, in these embodiments, the first and second coil springs 120 and 122 and the leaf spring 134 constituting the first and second urging means respectively exert an urging force in the pushing direction with respect to the support portion 118. However, it is also possible to configure the urging means to exert an urging force in the tensile direction. In addition, in this embodiment, about the structure and member similar to above-mentioned 1st embodiment, the detailed description is abbreviate | omitted by attaching | subjecting the code | symbol same as 1st embodiment in a figure.

  In the present embodiment, the axial position of the second coil spring 122 relative to the armature 100 can be changed and set by screwing the support nut 128 into the lower opening of the armature 100. The first coil spring 120 can also be set to change its axial position relative to the armature 100 by, for example, adopting a screwing structure for the locking fitting 126 in the upper opening of the armature 100.

  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, the connection 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.

  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.

  Further, the specific shapes of the armature 100 and the yoke member in the electromagnetic driving means 84 are not limited. For example, instead of the yoke member 90 covering the upper part of the coil 86, the sliding covering the inner periphery of the coil 86 is possible. The sleeve 92 is configured as a yoke member 90, and a magnetic pole is formed at the upper end edge of the yoke portion 90, and the upper end portion of the armature 100 extends radially outward so as to cover the yoke portion 90. A magnetic gap may be formed between the upper end edge of the magnet 90 or the inner peripheral surface of the lower end of the yoke portion 90 may protrude more radially inward to form a magnetic pole there. A path may be formed, and a magnetic gap may be formed between the magnetic pole and the lower end 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 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 attachment metal fitting 14 Second attachment metal fitting 16 Main body rubber elastic body 32 Diaphragm 34 Connection metal fitting 42 Partition member 44 Orifice member 46 Support rubber elastic body 48 Excitation plate 54 Working fluid chamber 56 Equilibrium chamber 58 Pressure receiving chamber 60 Excitation chamber 62 First orifice passage 65 Second orifice passage 78 Connecting rod 84 Electromagnetic excitation means 86 Coil 100 Armature 104 Insertion hole 120 First coil spring 122 Second coil spring 128 Support nut 130 Screw hole 132 Non-rotating Nut 134 leaf spring

Claims (5)

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 actuator for pressure control shake operation for chamber by allowed to vibration displacement of the plate, in active fluid filled type vibration damping device is disposed on the opposite side with the vibrating working chamber across the pressurized oscillating plate,
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. Te, placed inserted in a state in which a relative displacement in the axis-perpendicular direction the drive rod against the insertion hole is allowed, the armature itself incorporated in the first biasing means was allowed support and a second The drive rod is elastically linked to the armature by urging the drive rod in the axial direction opposite to the armature by the biasing means. Active fluid filled type vibration damping device, characterized in that the.
  The active fluid-filled vibration isolator according to claim 1, wherein an attachment position of at least one of the first and second urging means with respect to the armature can be changed in the axial direction.   In the armature, the insertion hole is penetrated in the axial direction, and the inner diameter of the opening on the vibration plate side in the insertion hole is larger than the inner diameter of the opening on the opposite side of the vibration plate. Item 3. The active fluid filled type vibration damping device according to Item 1 or 2. A support portion that extends outward in a direction perpendicular to the axis is formed near the tip of the drive rod that is inserted into the insertion hole of the armature and that is inserted into the armature, and is formed on both sides of the axial direction across the support portion. By disposing a first compression coil spring as the first urging means and a second compression coil spring as the second urging means so as to be positioned, the first urging means and The urging forces of the second urging means are applied to the support portion in opposite directions in the axial direction of the drive rod so that the drive rod including the support portion is perpendicular to the axis in the insertion hole of the armature. The active fluid-filled vibration isolator according to any one of claims 1 to 3, wherein the vibration isolator is elastically supported while being spaced inward from the inner peripheral surface of the insertion hole so that displacement in a direction is allowed.
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. Forming a chamber, and a fixing bracket is provided at the central portion of the flexible membrane, and the fixing bracket is attached to the vibration plate. Are fixed, the active fluid filled vibration damping device according to any one of claims 1 to 4 wherein the drive rod is projected toward the armature from said fixing bracket.

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