JP2008095930A - Vibration isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically control an orifice open close means to put an orifice passage corresponding to an input vibration frequency out of a plurality of orifice passages under a condition where liquid flows therein without using signal from an outside of a device. <P>SOLUTION: In a vibration isolating device 10, a magnetic movable piece 54 in a power generating part 55 vibrates in an axial direction and an electromagnetic coil 52 generates induced electromotive force corresponding to frequency and amplitude of input vibration when vibration is input and a rubber elastic body 48 elastically deforms, and the induced electromotive force is input in a controller 114 via a feeder cable 60. The controller 114 detects frequency of the input vibration based on the induced electromotive force generated by the electromagnetic coil 52, and controls a rotary actuator 108 to put only the orifices 86, 88 corresponding to the frequency of the input vibration under the condition where fluid flows and put rest of the orifices 86, 88 under a condition where fluid substantially does not flow (blocked condition or clogged condition). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is used as an engine mount or the like in general industrial machines or automobiles, and is a liquid-filled type of anti-vibration type that blocks and absorbs vibration from a vibration generating part of an engine or the like to prevent vibration transmission to a vibration receiving part of a vehicle body or the like. The present invention relates to a vibration device.

  An anti-vibration device is disposed between an engine that is a vibration generation unit of the vehicle and a vehicle body that is a vibration receiving unit. As such an anti-vibration device, there are provided a rubber elastic body, a pressure receiving liquid chamber having the rubber elastic body as a part of the inner wall, and a sub liquid chamber whose internal volume can be expanded and contracted, and the pressure receiving liquid chamber and the sub liquid chamber A liquid-sealed type is known in which each communicates with each other through an orifice passage. In this liquid-filled vibration isolator, when the engine is operated and vibration is generated, the liquid elastic fluid circulates in the orifice passage in accordance with the vibration absorbing action of the rubber elastic body and the liquid pressure change in the pressure receiving liquid chamber. Vibration is absorbed by the action of the column resonance, and vibration transmission to the vehicle body side is prevented.

  By the way, in the liquid filled type vibration isolator as described above, for example, the flow resistance of the liquid in the orifice passage is set (tuned) so as to correspond to the frequency and amplitude of the shake vibration. For this reason, when an idle vibration, which is a vibration in a higher frequency range than the shake vibration, is input, the orifice passage (shake orifice) is clogged, resulting in an increase in the fluid pressure in the pressure receiving fluid chamber and the dynamic spring constant of the device. To rise.

  As a conventional liquid-filled vibration isolator for the purpose of solving the above problem, for example, the one disclosed in Patent Document 1 is known. The vibration isolator described in Patent Document 1 includes a first movable piston disposed so as to face the pressure-receiving liquid chamber, a rod-shaped permanent magnet coupled so as to vibrate integrally with the first movable piston, and The pressure receiving liquid chamber receives the electromotive force generated by the power generation section including the coil section disposed on the outer peripheral side of the permanent magnet, the second movable piston disposed to face the pressure receiving liquid chamber, and the power generation section. And an actuator that vibrates the second movable piston along the expansion / contraction direction that expands / contracts the internal volume of the pressure receiving liquid chamber.

  According to the vibration isolator described in Patent Document 1, a shake orifice is clogged without installing a sensor for judging the type of vibration outside the apparatus or providing a wiring for connecting this sensor to the vibration isolator. Even when a vibration is input in a high frequency range, an increase in the fluid pressure in the pressure receiving fluid chamber is suppressed, so that an increase in the dynamic spring constant of the device can be effectively suppressed.

  Patent Document 2 discloses two orifice passages that respectively connect the pressure receiving liquid chamber and the sub liquid chamber, a rotary valve that selectively opens one of the two orifice passages, and closes the other. A liquid-filled vibration isolator having an electric actuator for driving a rotary valve is described. In this vibration isolator, a control means is input by signals from a vehicle speed sensor and a rotation speed sensor mounted on the vehicle. The type of vibration is determined, the actuator is operated by power supplied from a power source such as a battery mounted on the vehicle, and the rotary valve is rotated to a position corresponding to the input vibration by the actuator. Only one orifice passage is opened and the other orifice passage is closed.

According to the vibration isolator described in Patent Document 2, the control means switches the two orifice passages according to the frequency of the input vibration, so that the vibration in the low frequency region is caused by the liquid column resonance in the orifice passage for low frequencies. In addition to being able to absorb effectively, vibrations in the high frequency range can be effectively absorbed by liquid column resonance in the high frequency orifice passage.
JP 2002-235793 A (FIG. 7) Japanese Patent Laid-Open No. 7-224886

  However, in the vibration isolator described in Patent Document 1, the liquid pressure in the pressure receiving liquid chamber increases even when a low frequency vibration such as idle vibration that can be effectively absorbed by the action (attenuation) of the liquid column resonance in the orifice passage is input. As a result, the amplitude of the fluid pressure in the pressure receiving fluid chamber, which is the driving force for flowing the liquid through the orifice passage, is reduced, so that the attenuation obtained by the liquid column resonance in the orifice passage is reduced, and the low frequency region such as shake vibration is reduced. It will not be possible to efficiently absorb the vibrations.

  On the other hand, in the vibration isolator described in Patent Document 2, since it is necessary to transmit a signal from a sensor installed outside the apparatus to the control means in order to determine the type of input vibration, the sensor and the control means are wired. And the wiring route for laying this wiring needs to be provided on the vehicle side, so that the structure of the mounting portion of the vibration isolator in the vehicle becomes complicated, and the installation work when attaching the vibration isolator to the vehicle Becomes annoying.

  The object of the present invention is to allow the liquid to flow through only one orifice passage corresponding to the frequency of the input vibration among the plurality of orifice passages without using a signal from the outside of the apparatus in consideration of the above facts. An object of the present invention is to provide a vibration isolator capable of automatically controlling an orifice opening / closing means.

  In order to achieve the above object, a vibration isolator according to claim 1 of the present invention includes a first attachment member attached to a vibration generator, a second attachment member attached to a vibration receiver, A liquid chamber filled with a liquid is formed in a vibration isolator body composed of an elastic body interposed between the second mounting members, and one of the liquid chambers is partitioned by a partition member. A pressure receiving liquid chamber and the other as a sub liquid chamber are formed, and a plurality of orifice passages are formed in which the liquid chambers communicate with the partition member and the flow resistance is changed, and at least one of the orifice passages is selectively formed. In an anti-vibration device capable of switching an orifice corresponding to each mode of vibration in the vibration generating unit by providing an opening / closing means for opening / closing the orifice, an induced electromotive force is generated by a displacement associated with expansion / contraction change of the pressure receiving liquid chamber. Power generation means Thus the resulting power, characterized in that opening and closing the members constituting the orifice opening and closing means.

  The vibration isolator according to claim 2 of the present invention is the vibration isolator according to claim 1, wherein the orifice opening / closing means includes control means for switching control according to the frequency of input vibration to the apparatus main body. It is characterized by.

  The vibration isolator according to claim 3 of the present invention is the vibration isolator according to claim 2, wherein the control means is configured to reduce vibrations input from the vibration generating unit based on the induced electromotive force generated by the power generation means. 3. The vibration isolator according to claim 2, wherein the vibration detecting device detects the frequency and controls switching of the opening / closing means.

  The vibration isolator according to claim 4 of the present invention is the vibration isolator according to claim 2 or 3, characterized in that the control means includes a power storage unit that stores the electric power obtained by the power generation means. To do.

  The vibration isolator according to claim 5 of the present invention is the vibration isolator according to any one of claims 1 to 4, wherein the power generation means is integrated with a vibration part that is displaced by vibration from a vibration generation part. And a dielectric coil supported on the vibration isolator body oppositely or concentrically with the magnetic body.

  The vibration isolator according to claim 6 of the present invention is the vibration isolator according to any one of claims 1 to 5, characterized in that the power generation means is arranged in a pressure receiving liquid chamber.

  As described above, according to the vibration isolator of the present invention, the liquid flows through only one orifice passage corresponding to the frequency of the input vibration among the plurality of orifice passages without using a signal from the outside of the device. The orifice opening / closing means can be automatically controlled so that

  In addition, when an induced electromotive force is generated between the magnetized magnetic body and the electromagnetic coil in the power generation means, the input frequency can be detected by a signal in the circuit. The orifice opening / closing means (actuator, control means, etc.) can be controlled by sensing the vibration frequency. That is, it becomes easy to drive the actuator and generate a drive signal for the actuator by the control means.

  Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
A vibration isolator according to a first embodiment of the present invention will be described.

  FIG. 1 shows a vibration isolator according to a first embodiment of the present invention. The vibration isolator 10 is used, for example, as an engine mount in an automobile, and supports an engine that is a vibration generating unit on a vehicle body that is a vibration receiving unit. In the figure, symbol S indicates the axial center of the apparatus, and the following description will be given with the direction along the axial center S as the axial direction of the apparatus.

  As shown in FIG. 1, the vibration isolator 10 is provided with a thin-cylindrical outer tube fitting 12 having both ends in the axial direction on the lower side of the outer peripheral portion, and an upper side of the outer tube fitting 12. The mounting bracket 14 formed in a substantially disc shape is coaxially arranged as a second mounting member. A bolt 16 is fixed to the mounting bracket 14 at the center of the upper surface by welding or the like, and protrudes upward along the axis S. The mounting bracket 14 is fastened and fixed to an engine (not shown) side serving as a vibration generating portion via a bolt 16 and a nut (not shown) screwed into the bolt 16. Further, the mounting bracket 14 is provided with an insert portion 18 projecting downward at the center of the lower surface. The insert portion 18 is formed in a truncated conical cup shape whose outer diameter decreases in a tapered shape from the upper end side toward the lower end side, and is fixed to the lower surface side of the mounting bracket 14 by, for example, welding.

  A lower flange portion 20 that extends to the outer peripheral side is bent at the lower end portion of the outer cylinder fitting 12, and an upper flange portion 22 that extends to the outer peripheral side is bent at the upper end portion. The lower flange portion 20 has a cylindrical lower caulking portion 24 formed by bending the outer periphery side downward over the entire circumference, and the upper flange portion 22 also has an outer circumference side extending over the entire circumference. In this way, a cylindrical upper caulking portion 26 is formed by bending upward.

  In the vibration isolator 10, a substantially disk-shaped bottom plate member 28 is coaxially disposed as a first attachment member below the lower flange portion 20. The bottom plate member 28 is formed with a bottomed cylindrical air chamber forming portion 30 on the center side, and a bolt 32 is fixed to the center portion of the bottom plate of the air chamber forming portion 30 by welding or the like along the axis S. It protrudes downward. In the vibration isolator 10, the bottom plate member 28 is fastened and fixed to a vehicle body (not shown) serving as a vibration receiving portion via a bolt 32 and a nut (not shown) screwed into the bolt 32.

  The bottom plate member 28 is formed with a bottom plate flange portion 34 extending from the upper end portion of the air chamber forming portion 30 to the outer peripheral side, and the outer peripheral side of the bottom plate flange portion 34 is bent upward over the entire circumference. Thus, a cylindrical spacer portion 36 is formed. In the vibration isolator 10, the spacer portion 36 of the bottom plate member 28 is fitted and inserted into the inner circumferential side of the lower caulking portion 24, and in this state, the lower end portion of the lower caulking portion 24 is bent toward the inner circumferential side. Thereby, the bottom plate member 28 is sandwiched and fixed between the lower flange portion 20 and the lower end portion of the lower caulking portion 24.

  In the vibration isolator 10, a support plate 38 and a connecting member 40 are fitted on the inner peripheral side of the upper caulking portion 26. The support plate 38 is formed in an annular shape, and its outer diameter is slightly smaller than the inner diameter of the upper caulking portion 26. The support plate 38 is formed with a circular opening at the center, and the peripheral edge of the opening is bent over the entire circumference to form a cylindrical connecting and fixing part 42.

  The connecting member 40 is formed with a cylindrical main body portion 44 on the upper end side, and a connecting flange portion 46 extending from the main body portion 44 to the outer peripheral side is integrally formed. The main body portion 44 is formed in a tapered shape whose inner and outer diameters increase from the lower end side toward the upper end side.

  In the vibration isolator 10, after the support plate 38 is fitted and inserted into the inner circumferential side of the upper caulking portion 26, the connection flange portion 46 of the coupling member 40 is fitted and inserted into the inner circumferential side of the upper caulking portion 26. In this state, the upper end portion of the upper caulking portion 26 is bent toward the inner peripheral side. As a result, the support plate 38 and the connecting member 40 are sandwiched and fixed between the upper flange portion 22 and the upper caulking portion 26, respectively.

  In the vibration isolator 10, a rubber elastic body 48 formed in a substantially thick cylindrical shape is disposed between the mounting bracket 14 and the main body 44 of the connecting member 40. The rubber elastic body 48 is formed in a substantially C shape whose cross-sectional shape is open downward. The rubber elastic body 48 is vulcanized and bonded to the inner peripheral side and the inner peripheral surface of the upper end surface to the lower surface side of the mounting bracket 14 and the outer peripheral side of the insert portion 18, respectively, and the outer peripheral surface of the main body portion 44 of the connecting member 40. Vulcanized and bonded to the inner periphery. Thereby, the mounting bracket 14 and the connecting member 40 are connected via the rubber elastic body 48.

  In the vibration isolator 10, a cushion rubber 50 and an electromagnetic coil 52 are disposed on the inner peripheral side of the support plate 38. The cushion rubber 50 is formed in a thick cylindrical shape, and its outer peripheral surface is fixed to the inner peripheral surface of the connection fixing portion 42 by vulcanization adhesion. The electromagnetic coil 52 is also formed in a thick cylindrical shape as a whole, and the lower end side of the outer peripheral surface thereof is fixed to the inner peripheral surface of the cushion rubber 50 by adhesion or the like. As a result, the electromagnetic coil 52 is coaxially supported on the inner peripheral side of the outer cylinder fitting 12, the support plate 38 and the connecting member 40. Here, the electromagnetic coil 52 includes a core in which a metal magnetic material such as soft iron is formed in a cylindrical shape, and a copper wire wound around the core. Further, a protective film is formed on the surface of the electromagnetic coil 52 with a resin or the like as necessary, and a liquid filled in a pressure receiving liquid chamber 90 described later may enter the inside of the protective film (inside the electromagnetic coil 52). Is prevented.

  In the vibration isolator 10, a magnetic movable element 54 is disposed below the mounting bracket 14. The magnetic movable element 54 is formed in the shape of an elongated bar in the axial direction, and its upper end is connected and fixed to the center of the lower surface of the insert portion 18 and its lower end is inserted into the inner peripheral side of the electromagnetic coil 52. The magnetic mover 54 is configured by a permanent magnet 56 on the lower end side located on the inner peripheral side of the electromagnetic coil 52, and an upper portion of the permanent magnet 56 is an intermediate coupling portion 58 made of a magnetically permeable material such as resin. ing.

  In the vibration isolator 10, in a state where the rubber elastic body 48 is not deformed along the radial direction orthogonal to the axis S, the magnetic mover 54 is supported substantially coaxially with the electromagnetic coil 52, and the magnetic mover. Between the outer peripheral surface of 54 and the inner peripheral surface of the electromagnetic coil 52, a gap (magnetic gap) having a constant width is formed at an arbitrary position along the circumferential direction.

  Here, the electromagnetic coil 52 and the magnetic movable element 54 constitute a power generation unit 55 that generates an induced electromotive force when a vibration is input from the outside of the apparatus. One end of a power supply cable 60 is connected to the copper wire that constitutes the electromagnetic coil 52, and the other end of the power supply cable 60 passes through the inside of the wiring hole 62 that penetrates the outer tube metal fitting 12. 12 extends to the outer peripheral side.

  In the vibration isolator 10, for example, when vibration along the axial direction is input from the engine to the mounting bracket 14, the magnetic movable element 54 vibrates along the axial direction integrally with the mounting bracket 14. Thereby, the magnetic field generated from the permanent magnet 56 also changes along the axial direction, and the electromagnetic coil 52 generates an induced electromotive force in accordance with the change in the magnetic field (Faraday's law). The induced electromotive force becomes an alternating current waveform having a frequency substantially matching the vibration frequency of the magnetic movable element 54, and the current amplitude corresponds to the amplitude along the axial direction of the magnetic movable element 54.

  In the vibration isolator 10, a rubber diaphragm 66 is disposed between the outer cylinder fitting 12 and the bottom plate member 28. The diaphragm 66 has a thickened portion 68 that is thicker than the inner peripheral side at the outer peripheral edge portion, and an expansion / contraction portion 70 that has a convex curved shape toward the center side. . The diaphragm 66 is inserted into the inner peripheral side of the spacer portion 36 of the bottom plate member 28 with the thick portion 68 inserted between the bottom plate flange portion 34 and the lower flange portion 20 of the outer tube fitting 12. It is clamped so as to be in a pressurized state. Thereby, the diaphragm 66 is fixed between the outer cylinder fitting 12 and the bottom plate member 28, and the lower end side of the outer cylinder fitting 12 is closed by the diaphragm 66.

  In the vibration isolator 10, the upper end side of the outer cylinder fitting 12 is closed by the rubber elastic body 48 and the lower end side is closed by the diaphragm 66, so that the outer cylinder fitting 12 is partitioned from the outside of the apparatus on the inner peripheral side. A cylindrical space (liquid chamber space) is formed. In the vibration isolator 10, a thick disk-shaped partition wall member 72 is fitted on the inner peripheral side of the outer tube fitting 12, and the partition wall member 72 is used for the liquid chamber space in the outer tube fitting 12 as a rubber. The elastic body 48 is divided into a pressure receiving liquid chamber 90 having a part of the inner wall and a diaphragm 66 having a sub liquid chamber 92 having a part of the partition wall. The pressure receiving liquid chamber 90 and the sub liquid chamber 92 are filled with a liquid such as water or ethylene glycol.

  The partition member 72 is provided with an orifice forming portion 78 having a cylindrical shape with a substantially constant outer diameter on the upper end side, and a partition flange portion 74 extending from the lower end portion of the orifice forming portion 78 to the outer peripheral side. Is formed. Here, a concave portion 76 having a substantially semicircular cross-sectional shape is formed on the center side of the lower end surface of the orifice forming portion 78.

  The partition wall member 72 has the orifice forming portion 78 inserted into the inner peripheral side of the outer cylinder fitting 12. The partition flange portion 74 has an upper surface abutted against the lower flange portion 20 of the outer cylindrical metal member 12 and a lower surface pressed against the outer peripheral side of the expansion / contraction portion 70 of the diaphragm 66. Accordingly, the partition flange portion 74 is sandwiched between the lower flange portion 20 of the outer tube fitting 12 and the bottom plate flange portion 34 of the bottom plate member 28 together with the diaphragm 66, and is fixed within the outer tube fitting 12.

  A rubber coating film is vulcanized and bonded to the inner peripheral surface of the outer tube fitting 12, and the inner peripheral surface of the outer tube fitting 12 is brought into pressure contact with the partition wall member 72 through the peritoneum. The sealing property between the inner peripheral surface of 12 and the outer peripheral surface of the partition wall member 72 may be enhanced.

  As shown in FIGS. 1 and 2, the orifice forming portion 78 of the partition wall member 72 is formed with an orifice groove 80 having a rectangular cross section extending in the circumferential direction on the outer peripheral surface. In the portion 78, a communication groove 82 penetrating between one end portion of the orifice groove 80 and the upper end surface of the orifice forming portion 78 is formed on the outer peripheral surface, and the other end portion of the orifice groove 80 and the inside of the recess 76 are formed. A communication hole 84 penetrating between the peripheral surface and the peripheral surface is formed.

  In the vibration isolator 10, the outer peripheral side of the orifice groove 80 and the communication groove 82 is closed by the inner peripheral surface of the outer cylinder fitting 12, so that the pressure receiving liquid chamber 90 and the auxiliary liquid are separated by the orifice groove 80, the communication groove 82, and the communication hole 84. A shake orifice 86 communicating with the chamber 92 is formed. The path length and cross-sectional area of the shake orifice 86, that is, the flow resistance of the liquid is tuned so as to correspond to the frequency of the shake vibration (for example, 8 Hz to 12 Hz).

  As shown in FIG. 1, the partition member 72 is formed with a valve body storage chamber 94 that is a cylindrical space inside the orifice forming portion 78 and above the valve body storage chamber 94 in the orifice forming portion 78. The lid portion 96 is fixed in the opening portion 97 by adhesion or the like so as to close the opening portion 97 that faces and opens into the valve body storage chamber 94. . The lower surface side of the lid portion 96 forms a part of the inner peripheral surface of the valve body storage chamber 94. The valve body storage chamber 94 is disposed so that the radial direction of the vibration isolator 10 is an axial direction, and a bottomed cylindrical valve body 98 whose outer peripheral side is closed is rotatable in the valve body storage chamber 94. It is stored in.

  The orifice forming portion 78 is formed with a communication hole 100 penetrating between the inner peripheral surface of the valve body storage chamber 94 and the inner peripheral surface of the recess 76. The lid 96 is formed with a rectangular opening / closing hole 102 penetrating between the inner peripheral surface of the valve body storage chamber 94 and the upper end surface of the orifice forming portion 78. On the other hand, a rectangular valve hole 104 penetrating the peripheral wall is formed in the valve body 98, and the cross-sectional shape of the valve hole 104 substantially matches the cross-sectional shape of the opening / closing hole 102.

  As shown in FIG. 1, in the vibration isolator 10, when the valve body 98 is in a position (open position) where the valve hole 104 is aligned with the opening / closing hole 102, the inside of the opening / closing hole 102, the valve hole 104, and the valve body 98. The space and the communication hole 100 constitute an idle orifice 88 that communicates with the pressure receiving liquid chamber 90 and the sub liquid chamber 92. The path length and cross-sectional area of the idle orifice 88, that is, the flow resistance of the liquid is tuned to correspond to the frequency of idle vibration (for example, 20 Hz to 30 Hz). It is getting smaller. In the vibration isolator 10, as shown in FIG. 2, when the valve body 98 rotates to a position (closed position) that separates the valve hole 104 from the opening / closing hole 102, the valve hole 104 is blocked by the outer peripheral surface of the valve body 98. The idle orifice 88 is also closed.

  As shown in FIG. 1, the orifice forming portion 78 is formed with a shaft hole 106 that penetrates the peripheral wall portion on the outer peripheral side of the valve body storage chamber 94 along the axial center of the valve body 98. 12, a shaft hole 107 penetrating the peripheral wall portion is formed on the extension line of the shaft hole 106. Further, a rotary actuator 108 is attached to the outer cylinder fitting 12 on the outer peripheral side of the shaft hole 107 on the outer peripheral surface.

  The rotary actuator 108 incorporates a drive source such as a motor and an electromagnetic solenoid, and a positioning mechanism for the drive shaft 110 connected to the drive source. The drive shaft 110 is inserted into the valve body storage chamber 94 through the shaft hole 107 and the shaft hole 106, and the tip portion thereof is coaxially connected and fixed to the bottom plate portion on the outer peripheral side of the valve body 98. Further, a rubber O-ring 112 is disposed in a compressed state on the outer peripheral side of the drive shaft 110 in the shaft hole 106, and passes between the inner peripheral surface of the shaft hole 106 and the outer peripheral surface of the drive shaft 110. The liquid is prevented from leaking.

  The positioning mechanism of the rotary actuator 108 rotates and holds the drive shaft 110 together with the valve body 98 by the torque from the drive source when a predetermined drive current is supplied to the rotary actuator 108 (when it is on). When the supply of a predetermined drive current to the rotary actuator 108 is stopped (OFF), the drive shaft 110 is rotated from the open position to the closed position together with the valve body 98 and held.

  The vibration isolator 10 includes a controller 114 that detects the frequency of vibration input from the outside based on the induced electromotive force generated by the power generation unit 55 and controls the rotary actuator 108 in accordance with the frequency of the input vibration. Yes. A power supply cable 60 is connected to the controller 114, and an induced electromotive force generated by the electromagnetic coil 52 is input via the power supply cable 60. The controller 114 includes a microcomputer, a detection circuit that detects the frequency of the induced electromotive force, a rectifying element that converts the alternating induced electromotive force into a constant direct current, a switching element that is turned on and off by control (contact signal) from the microcomputer, and the like. The switching element is connected to the rotary actuator 108 via the power cable 116.

  Next, the operation and action of the vibration isolator 10 according to the present embodiment will be described.

  In the vibration isolator 10, when the engine connected to the mounting bracket 14 is operated, vibration from the engine is transmitted to the rubber elastic body 48 via the mounting bracket 14. At this time, the rubber elastic body 48 acts as a main vibration absorber, and the rubber elastic body 48 is elastically deformed, so that the vibration level inputted is cut off and absorbed and the vibration level transmitted to the vehicle body side is lowered. Note that main vibrations (resonance vibrations) input from the engine include idle vibrations that occur near the idling speed and shake vibrations that occur when the vehicle is traveling at high speed.

  In the vibration isolator 10, when the vibration is input and the rubber elastic body 48 is elastically deformed in the expansion / contraction direction for expanding and contracting the internal volume of the pressure receiving liquid chamber 90, the magnetic movable element 54 in the power generation unit 55 vibrates in the axial direction. At the same time, the electromagnetic coil 52 generates an induced electromotive force corresponding to the frequency and amplitude of the input vibration, and this induced electromotive force is input to the controller 114 via the power feeding cable 60.

  At this time, the controller 114 detects the frequency of the input vibration based on the induced electromotive force generated by the electromagnetic coil 52, and only one orifice 86, 88 corresponding to the frequency of the input vibration is in a state where the liquid flows. The rotary actuator 108 is controlled so that the remaining orifices 86 and 88 are not substantially allowed to flow into the liquid (blocked state or clogged state).

  Specifically, when the frequency of the input vibration is less than the frequency of the idle vibration, the controller 114 does not supply the direct current converted from the induced electromotive force to the rotary actuator 108, thereby causing the valve body 98 to be used by the rotary actuator 108. Is kept in the closed position, the idle orifice 88 is closed, and when the frequency of the input vibration becomes equal to or higher than the frequency of the idle vibration, the direct current converted from the induced electromotive force is supplied to the rotary actuator 108. Thus, the rotary actuator 108 rotates the valve body 98 from the closed position to the open position, and the idle orifice 88 is opened.

  As a result, in the vibration isolator 10, when the rubber elastic body 48 is elastically deformed to expand and contract the internal volume of the pressure receiving liquid chamber 90 when the shake vibration is input, the idle orifice 88 is closed by the valve body 98. Therefore, the liquid goes back and forth between the pressure receiving liquid chamber 90 and the sub liquid chamber 92 through only the shake orifice 86. At this time, since the shake orifice 86 is set (tuned) so as to correspond to the frequency of the shake vibration, a resonance phenomenon (liquid column resonance) occurs in the liquid flowing through the shake orifice 86, and this liquid column resonance causes the resonance. The input shake vibration can be absorbed particularly effectively.

  Further, in the vibration isolator 10, when the rubber elastic body 48 is elastically deformed and expands or contracts the internal volume of the pressure receiving liquid chamber 90 when the idle vibration is input, the shake orifice 86 corresponding to the shake vibration becomes clogged. Although the liquid does not substantially flow into the shake orifice 86, the liquid flows back and forth between the pressure receiving liquid chamber 90 and the sub liquid chamber 92 through the idle orifice 88 opened by the valve body 98. At this time, since the idle orifice 88 is set (tuned) so as to correspond to the frequency of idle vibration, a resonance phenomenon (liquid column resonance) occurs in the liquid flowing through the idle orifice 88, and this liquid column resonance causes The input idle vibration can be absorbed particularly effectively.

  As a result, according to the vibration isolator 10, even if the input vibration changes to either the shake vibration or the idle vibration, one orifice 86 that matches the frequency of the input vibration out of the two orifices 86 and 88, Since only the liquid 88 can be made to flow, a liquid column resonance is efficiently generated in the liquid that moves back and forth in the orifices 86 and 88 in accordance with a change in the liquid pressure in the pressure receiving liquid chamber 90. Input vibration (shake vibration or idle vibration) can be effectively absorbed.

  Further, according to the vibration isolator 10, since the controller 114 can detect the frequency of the input vibration based on the induced electromotive force generated by the power generation unit 55 arranged in the pressure receiving liquid chamber 90, it is like a conventional vibration isolator. In addition, without using a detection signal from a sensor or the like installed outside the apparatus, the controller 114 can select only one orifice 86, 88 corresponding to the frequency of the input vibration out of the two shake orifices 86 and idle orifices 88. The rotary actuator 108 is automatically turned on so that the remaining orifices 86 and 88 are in a state where the liquid does not substantially flow (closed state due to the valve body 98 or clogged state due to an increase in flow resistance). Can be controlled.

  Further, according to the vibration isolator 10, the controller 114 converts the induced electromotive force generated by the power generation unit 55 at the time of vibration input into a direct current, and this direct current is supplied at the time of input of idle vibration, and the supply is stopped at the time of input of shake vibration. Thus, since the rotary actuator 108 can be operated, the rotary actuator 108 can be operated without receiving power supply from an external power source such as a battery installed outside the apparatus like a conventional vibration isolator. Can do.

  In the vibration isolator 10 according to the present embodiment, the pressure receiving liquid chamber 90 and the sub liquid chamber 92 are communicated with each other by two orifice passages (shake orifice 86 and idle orifice 88). The present invention is not limited to a book, and three or more orifice passages may be provided.

  In this case, each of the remaining orifice passages (for example, an idle orifice and a squeezing orifice) except for one orifice passage (for example, a shake orifice) tuned to fit the vibration on the low frequency side, respectively, is a valve body. Therefore, the valve body storage chambers are provided in the middle of the remaining orifice passages, and the open / close states of the orifice passages are controlled by the valve bodies stored in these valve body storage chambers. Each needs to be controlled.

  Further, in the vibration isolator 10, as shown in FIG. 1A, a magnetic movable element 54 provided with one permanent magnet 56 is used. However, as shown in FIG. A magnetic mover 118 having two (for example, two) permanent magnets 56 may be used. In this magnetic mover 118, a plurality of permanent magnets 56 are arranged at regular intervals along the axial direction, and a spacer 119 made of a magnetically permeable material is interposed between the plurality of permanent magnets 56. ing. By using the magnetic mover 118 having a plurality of permanent magnets 56 as described above, the electromotive force can be generated more efficiently by the power generation unit 55 than when the magnetic mover 54 is used.

(Second Embodiment)
Next, a vibration isolator according to the second embodiment of the present invention will be described.

  4 and 5 show a vibration isolator according to a second embodiment of the present invention. In the vibration isolator 120 according to the present embodiment, the same parts as those of the vibration isolator 10 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The vibration isolator 120 is provided with a thin-cylindrical outer cylinder fitting 122 that is open at both ends in the axial direction on the lower side of the outer circumference thereof, and an intermediate cylinder 124 is fitted on the inner circumference side of the outer cylinder fitting 122. It is inserted. The intermediate cylinder 124 is also formed in a substantially cylindrical shape with both axial ends opened. The outer tube fitting 122 has both end portions in the axial direction as caulking portions 126 and 128, respectively.

  The intermediate cylinder 124 is formed with a liquid chamber forming portion 130 and a liquid chamber forming portion 132 that are recessed toward the inner peripheral side on one end side and the other end side along the radial direction. The liquid chamber forming part 130 and the liquid chamber forming part 132 are arranged apart from each other in the circumferential direction. One liquid chamber forming portion 130 is closed on the outer peripheral side by a first diaphragm 134, and a space (hydraulic pressure space) partitioned from the outside is formed inside. The other liquid chamber forming part 132 is also closed on the outer peripheral side by a second diaphragm 136, and a space (hydraulic pressure space) partitioned from the outside is formed inside. Here, each of the first diaphragm 134 and the second diaphragm 136 can be deformed in a direction (in this embodiment, a radial direction) for expanding and contracting the hydraulic pressure space, and the rigidity of the second diaphragm 136 is the first diaphragm. It is higher than the rigidity of 134.

  In the vibration isolator 120, a linear actuator 138 is attached to the outer peripheral surface of the outer cylindrical fitting 122, and the linear actuator 138 supports the drive shaft 140 so as to be extendable and contractible. The linear actuator 138 has one end side inserted into the liquid chamber forming portion 132 through the opening 142 formed in the outer cylindrical metal fitting 122, and the tip end portion of the drive shaft 140 is connected to the second diaphragm via the disk-shaped connecting plate 144. 136 is connected to the central portion of 136.

  The rubber elastic body 48 is disposed between the lower surface side of the mounting bracket 14 and the upper end portion of the intermediate cylinder 124 and elastically connects the mounting bracket 14 and the intermediate cylinder 124. The rubber elastic body 48 is integrally formed with a thin film-like covering portion 146 that covers the inner peripheral surface of the intermediate cylinder 124, and this covering portion 146 is formed by the liquid chamber forming portions 130 and 132 of the intermediate cylinder 124. It covers the lower area from the upper end.

  On the inner peripheral side of the intermediate cylinder 124, an orifice member 148 and a support ring 150 formed in a substantially cylindrical shape are fitted and inserted, respectively. The orifice member 148 is provided with a thick cylindrical main body 152 on the upper end side and a flange portion 154 extending to the outer peripheral side on the lower end portion. The orifice member 148 inserts the main body portion 152 into the inside of the pair of liquid chamber forming portions 130 and 132, and causes the upper surface side of the flange portion 154 to contact the lower end portions of the pair of liquid chamber forming portions 130 and 132. Yes.

  In the main body 152 of the orifice member 148, a lower groove 156 extending in the circumferential direction is formed on the lower end side of the outer peripheral surface, and an upper groove 158 extending in the circumferential direction is also formed on the upper end side. Yes. Here, the cross-sectional area of the upper groove 158 is smaller than the cross-sectional area of the lower groove 156.

  The main body 152 is formed with a lower communication hole 160 penetrating between one end of the lower groove 156 and the inner peripheral surface of the main body 152. The liquid chamber forming portion 130, the covering portion 146, and the main body portion 152 are formed with a lower communication port 164 that communicates the other end portion of the lower groove portion 156 with a first sub liquid chamber 184 described later. The main body 152 is formed with an upper communication hole 162 penetrating between one end of the upper groove 158 and the inner peripheral surface of the main body 152. The liquid chamber forming portion 132, the covering portion 146, and the main body portion 152 are formed with an upper communication port 166 that allows the other end portion of the upper groove portion 158 to communicate with a second sub liquid chamber 184 described later.

  In the vibration isolator 120, the outer peripheral side of the lower groove portion 156 is blocked by the inner peripheral surface of the intermediate cylinder 124 via the covering portion 146, so that the lower groove portion 156, the lower communication hole 160, and the lower communication port 164 are used. The shake orifice 168 is configured, and the outer peripheral side of the upper groove portion 158 is closed by the inner peripheral surface of the intermediate cylinder 124 via the covering portion 146, so that the upper groove portion 158, the upper communication hole 162, and the upper communication port 166 An idle orifice 170 is configured.

  The upper end surface of the support ring 150 is in contact with the lower end side of the flange portion 154 of the orifice member 148. A disc-shaped diaphragm 172 is coaxially supported via an annular elastic coupling body 174 on the inner peripheral side of the support ring 150. The vibration plate 172 vibrates in the axial direction at a period (vibration period) that substantially matches the period of change in the liquid pressure of the pressure receiving liquid chamber 182 when the liquid pressure in the pressure receiving liquid chamber 182 to be described later periodically changes. A magnetic movable element 54 is attached to the diaphragm 172 so as to protrude downward along the axis S at the center of the lower surface.

  On the inner peripheral side of the outer cylinder fitting 122, a substantially disc-shaped bottom plate member 176 is fitted on the lower side of the intermediate cylinder 124. The bottom plate member 176 is formed with a circular concave air chamber forming portion 178 at the center and a bent bottom plate flange portion 180 extending from the upper end of the air chamber forming portion 178 to the outer peripheral side. The bottom plate member 176 abuts the outer peripheral edge portion on the upper surface side of the bottom plate flange portion 180 against the lower end surface of the intermediate tube 124 in a state where the bottom plate member 176 is fitted to the inner peripheral side of the outer tube fitting 122. In this state, the outer tubular fitting 122 has a pair of caulking portions 126 and 128 bent toward the inner peripheral side. Thereby, in the vibration isolator 120, the intermediate cylinder 124, the orifice member 148, the support ring 150, and the bottom plate member 176 are fixed to the inner peripheral side of the outer cylinder fitting 122.

  In the vibration isolator 120, the space on the inner peripheral side of the intermediate cylinder 124, the space in the liquid chamber forming unit 130, and the space in the liquid chamber forming unit 132 are filled with a liquid such as water and ethylene glycol, respectively. Thereby, the space on the inner peripheral side of the intermediate cylinder 124, the space in the liquid chamber forming portion 130, and the space in the liquid chamber forming portion 132 are the pressure receiving liquid chamber 182, the first sub liquid chamber 184 for absorbing shake vibration, and the idle. The second auxiliary liquid chamber 186 is used for absorbing vibration.

  A ring-shaped electromagnetic coil 52 is fitted and fixed in the circular concave air chamber forming portion 178 of the bottom plate member 176. A magnetic movable element 54 is coaxially supported by a diaphragm 172 on the inner peripheral side of the support ring 150. Here, the magnetic movable element 54 and the electromagnetic coil 52 constitute a power generation unit 55 that generates an induced electromotive force when the diaphragm 172 vibrates. The induced electromotive force generated by the power generation unit 55 is supplied to the controller 114 via the power supply cable 60. Further, the controller 114 supplies a constant voltage DC current converted from the induced electromotive force to the linear actuator 138 via the power cable 116 or stops the supply.

  The linear actuator 138 incorporates a drive source such as a motor and an electromagnetic solenoid and a positioning mechanism for the drive shaft 140 connected to the drive source. The linear actuator 138 holds the drive shaft 140 in the most extended closed position (see FIG. 4) when supply of a predetermined drive current from the controller 114 is stopped (when it is off). As a result, the second diaphragm 136 is brought into pressure contact with the peripheral edge portion of the upper communication port 166 in the liquid chamber forming portion 132, and the idle orifice 170 is closed. Further, the linear actuator 138 contracts the drive shaft 140 from the closed position and moves it to the open position (see FIG. 5) when the drive current is supplied from the controller 114 (when turned on). As a result, the second diaphragm 136 is separated from the peripheral edge of the upper communication port 166 in the liquid chamber forming portion 132 toward the outer peripheral side, and the idle orifice 170 is opened.

  Next, the operation and action of the vibration isolator 120 according to this embodiment will be described.

  In the vibration isolator 120, when the engine connected to the mounting bracket 14 is operated, vibration from the engine is transmitted to the rubber elastic body 48 via the mounting bracket 14. At this time, the rubber elastic body 48 acts as a main vibration absorber, and the rubber elastic body 48 is elastically deformed, so that the vibration level inputted is cut off and absorbed and the vibration level transmitted to the vehicle body side is lowered.

  In the vibration isolator 120, when the vibration is input and the rubber elastic body 48 is elastically deformed in the expansion / contraction direction that expands and contracts the internal volume of the pressure receiving liquid chamber 182, the magnetic movable element 54 in the power generation unit 55 vibrates in the axial direction. At the same time, the electromagnetic coil 52 generates an induced electromotive force corresponding to the frequency and amplitude of the input vibration, and this induced electromotive force is input to the controller 114 via the power feeding cable 60.

  At this time, the controller 114 detects the frequency of the input vibration based on the induced electromotive force generated by the electromagnetic coil 52, and only one orifice 168, 170 corresponding to the frequency of the input vibration is in a state where the liquid flows. The linear actuator 138 is controlled so that the remaining orifices 168 and 170 are not substantially allowed to flow into the liquid (blocked state or clogged state).

  Specifically, when the frequency of the input vibration is less than the frequency of the idle vibration, the controller 114 does not supply the direct current converted from the induced electromotive force to the linear actuator 138, whereby the drive shaft 140 is driven by the linear actuator 138. When the second diaphragm 136 is held at the closed position, the idle orifice 170 is closed, and the frequency of the input vibration is equal to or higher than the frequency of the idle vibration, the direct current converted from the induced electromotive force is used as the linear actuator. By supplying to 138, the drive shaft 140 and the second diaphragm 136 are moved from the closed position to the open position by the linear actuator 138, and the idle orifice 170 is opened.

  As a result, in the vibration isolator 120, when the rubber elastic body 48 is elastically deformed to expand and contract the internal volume of the pressure receiving liquid chamber 90 when the shake vibration is input, the idle orifice 170 is closed by the valve body 98. Therefore, the liquid goes back and forth between the pressure receiving liquid chamber 182 and the first sub liquid chamber 184 only through the shake orifice 168. At this time, since the shake orifice 168 is set (tuned) so as to correspond to the frequency of the shake vibration, a resonance phenomenon (liquid column resonance) occurs in the liquid flowing through the shake orifice 168, and this liquid column resonance causes The input shake vibration can be absorbed particularly effectively.

  Further, in the vibration isolator 120, when the rubber elastic body 48 is elastically deformed and expands or contracts the internal volume of the pressure receiving liquid chamber 182 when the idle vibration is input, the shake orifice 168 corresponding to the shake vibration is clogged, Although the liquid does not substantially flow through the shaker orifice 86, the liquid passes between the pressure receiving liquid chamber 182 and the second sub liquid chamber 186 through the idle orifice 170 opened by the second diaphragm 136 moved to the open position. go and come. At this time, since the idle orifice 170 is set (tuned) so as to correspond to the frequency of idle vibration, a resonance phenomenon (liquid column resonance) occurs in the liquid flowing through the idle orifice 170, and this liquid column resonance causes The input idle vibration can be absorbed particularly effectively.

  As a result, according to the vibration isolator 120, even if the input vibration changes to either the shake vibration or the idle vibration, the single orifice 168 that matches the frequency of the input vibration out of the two orifices 168 and 170, Since only the liquid 170 can be made to flow, a liquid column resonance is efficiently generated in the liquid that moves back and forth in the orifices 168 and 170 in accordance with a change in the liquid pressure in the pressure receiving liquid chamber 90, and this liquid column resonance acts. Input vibration (shake vibration or idle vibration) can be effectively absorbed.

  Further, according to the vibration isolator 120, as in the vibration isolator 10 according to the first embodiment, the controller 114 corresponds to the frequency of the input vibration without using a detection signal from a sensor or the like installed outside the apparatus. So that only one orifice 168, 170 is in a state where liquid flows, and the remaining orifices 168, 170 are in a state where liquid does not substantially flow (blocked state or clogged state due to an increase in flow resistance). The actuator 138 can be automatically controlled, and the linear actuator 138 can be operated using the induced electromotive force generated by the power generation unit 55 without receiving power from an external power source such as a battery installed outside the apparatus. it can.

  In the vibration isolator 120 according to the present embodiment, the pressure receiving liquid chamber 182 and the two sub liquid chambers 184 and 186 are communicated with each other by two orifice passages (shake orifice 168 and idle orifices 170 and 170). However, the number of orifice passages is not limited to two, and three or more orifice passages may be provided.

  In this case, each of the remaining orifice passages (for example, an idle orifice and a squeezing orifice) except for one orifice passage (for example, a shake orifice) tuned to fit the vibration on the low frequency side, respectively, is a valve body. Therefore, the valve body storage chambers are provided in the middle of the remaining orifice passages, and the open / close states of the orifice passages are controlled by the valve bodies stored in these valve body storage chambers. Each needs to be controlled.

  In the vibration isolator 10 according to the present embodiment, the magnetic movable element 54 is attached to the vibration plate 172 supported via the elastic coupling body 174 so as to face the pressure receiving liquid chamber 182, and the magnetic movable element 54 is vibrated. Since the induced electromotive force is generated by the electromagnetic coil 52 by vibrating with the plate 172, even when vibration along the direction perpendicular to the axis is input to the mounting bracket 14, the outer peripheral surface of the magnetic movable element 54 and the electromagnetic coil 52 are Since the width along the radial direction of the magnetic gap formed between the inner peripheral surface and the inner circumferential surface can always be kept constant, the width along the radial direction of the width magnetic gap changes and the waveform of the induced electromotive force is disturbed. This can be effectively prevented, and power generation efficiency can be effectively prevented from decreasing.

  Further, by changing the pressure receiving area of the elastic coupling body 174 and the diaphragm 172 that receives the hydraulic pressure from the pressure receiving liquid chamber 182, the amplitude along the axial direction of the magnetic movable element 54 at the time of vibration input can be adjusted. The power generation efficiency of the power generation unit 55 can be improved by optimizing the amplitude of the magnetic mover 54.

  Further, in the vibration isolator 10 or 120 according to the present invention, the idle orifices 88 and 170 are opened by the actuators 108 and 138 when the current is supplied from the controller 114. When the current is supplied, the idle orifices 88 and 170 may be closed by the actuators 108 and 138, and when the current supply is stopped, the idle orifices 88 and 170 may be opened. In addition, by reversing the polarity of the current supplied to the actuators 108 and 138 by the controller 114, the operating directions of the actuators 108 and 138 may be changed to control the opening and closing of the idle orifices 88 and 170.

  Further, the controller 114 is provided with a power storage unit such as a capacitor or a battery so that the induced electromotive force generated by the electromagnetic coil 52 is always stored at the time of vibration input, and the actuators 108 and 138 are operated using the power stored in the power storage unit. You may do it.

  Further, in the vibration isolators 10 and 120 according to the first and second embodiments of the present invention, the controller 114 determines the frequency of the input vibration based on the induced electromotive force generated by the electromagnetic coil 52 and sets the frequency of the input vibration. The open / close state of a plurality of orifices was controlled accordingly, but the actuators 108 and 138 used are those that open the idle orifice when power is supplied and self-return to the position where the idle orifice is closed when power is not supplied. At the same time, the power generation unit is configured not to generate the induced electromotive force with the amplitude of the idle vibration but to generate the induced electromotive force only with the amplitude of the shake vibration. If power is supplied, the shake orientation is changed according to the frequency of the input vibration without using the controller 114. It is possible to properly control the opening and closing states of the office and idle orifice.

It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on the 1st Embodiment of this invention, and has shown the state by which the idle orifice was open | released. It is side surface sectional drawing which shows the structure of the vibration isolator shown by FIG. 1, and has shown the state by which the idle orifice was obstruct | occluded. It is a plane sectional view showing the composition of the vibration isolator shown in FIG. It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on the 2nd Embodiment of this invention, and has shown the state by which the idle orifice was obstruct | occluded. It is side surface sectional drawing which shows the structure of the vibration isolator shown by FIG. 4, and has shown the state by which the idle orifice was open-closed.

Explanation of symbols

10 Vibration isolator 12 Outer cylinder bracket 14 Mounting bracket (first mounting member)
28 Bottom plate member (second mounting member)
48 Rubber elastic body 52 Electromagnetic coil (power generation means)
54 Magnetic mover (power generation means)
55 Power generation part (power generation means)
56 Permanent magnet 58 Intermediate connection 86 Shake orifice (orifice passage)
88 Idle orifice (orifice passage)
90 Pressure receiving chamber 92 Sub liquid chamber 98 Valve body (orifice opening / closing means)
108 Rotary actuator (Orifice opening / closing means)
114 controller 118 magnetic movable element 119 spacer 120 vibration isolator 122 outer cylinder fitting 124 intermediate cylinder 138 linear actuator (orifice opening / closing means)
168 Shake orifice (orifice passage)
170 Idle orifice (orifice passage)
172 Diaphragm 174 Elastic coupling body 182 Pressure receiving liquid chamber 184 First sub liquid chamber 186 Second sub liquid chamber

Claims (6)

A vibration isolator comprising a first attachment member attached to the vibration generating portion, a second attachment member attached to the vibration receiving portion, and an elastic body interposed between the first and second attachment members. In the main body, a liquid chamber filled with liquid is formed,
By partitioning the liquid chamber with a partition member, one is a pressure-receiving liquid chamber, the other is a sub liquid chamber, and a plurality of orifice passages that communicate the liquid chambers with the partition member and change flow resistance. Forming,
In the vibration isolator capable of switching the orifice according to each mode of vibration in the vibration generating unit by providing an orifice opening / closing means for selectively opening and closing at least one of the orifice passages,
An anti-vibration device comprising: a power generation unit that generates an induced electromotive force by a displacement associated with the expansion / contraction change of the pressure receiving liquid chamber, and opening / closing a member constituting the orifice opening / closing unit by the electric power obtained by the power generation unit.   2. The vibration isolator according to claim 1, wherein the orifice opening / closing means includes a control means for performing switching control according to a frequency of input vibration to the apparatus main body.   3. The anti-vibration device according to claim 2, wherein the control means detects the frequency of vibration input from the vibration generating unit based on the induced electromotive force generated by the power generation means, and switches and controls the opening / closing means. .   The vibration control device according to claim 2, wherein the control unit includes a power storage unit that stores electric power obtained by the power generation unit.   The power generation means is supported by a vibration isolator main body opposite to or concentric with the magnetic body, and a magnetized magnetic body integrally attached to a vibration section that is displaced by vibration from a vibration generation section. The vibration isolator according to any one of claims 1 to 4, comprising a dielectric coil.   6. The vibration isolator according to claim 1, wherein the power generation means is disposed in a pressure receiving liquid chamber.

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