JP5038198B2 - Fluid filled vibration isolator - Google Patents

Description

  The present invention relates to a fluid-filled vibration isolator using an anti-vibration effect based on the flow action of an incompressible fluid enclosed therein, and in particular, a switchable fluid-filled type capable of switching vibration-proof characteristics by energization. The present invention relates to a vibration isolator.

  Conventionally, an enclosure enclosed inside as a type of vibration isolator which is interposed between members constituting the vibration transmission system and supports the vibration transmission system between the members constituting the vibration transmission system. 2. Description of the Related Art There is known a fluid-filled vibration isolator that uses a fluid flow action to exhibit an effective vibration isolating effect against vibrations of a target frequency. Such a fluid-filled vibration isolator is employed, for example, as an engine mount or member mount of an automobile.

  By the way, in the fluid-filled vibration isolator, an orifice passage that connects the pressure receiving chamber filled with the incompressible fluid and the equilibrium chamber to each other is provided. A relative pressure fluctuation difference is generated between the pressure receiving chamber in which the pressure fluctuation is caused by the elastic deformation of the elastic body and the equilibrium chamber in which the volume change is allowed by the elastic deformation of the flexible film. Then, based on the difference in pressure fluctuation, the enclosed fluid is caused to flow through the orifice passage between the two chambers, so that the vibration isolation effect is exhibited based on the resonance phenomenon of the fluid fluid.

  In a fluid-filled vibration isolator using such fluid flow action, an effective anti-vibration effect is exerted against vibration input of a specific frequency with the orifice passage tuned, while other frequencies There is a problem that an effective anti-vibration effect cannot be obtained for vibration input, and when vibrations in a plurality of different frequency ranges are selectively input, the intended anti-vibration effect is not sufficient. There was a possibility that it could not be realized.

  Therefore, in the fluid filled type vibration isolator shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-150546), a first orifice passage and a second orifice passage tuned to different frequencies are provided, By controlling the second orifice passage between the communication state and the cutoff state, the vibration isolation characteristics can be switched and controlled.

  In particular, in Patent Document 1, when the coil is not energized, the valve element is pressed against the opening on the equilibrium chamber side of the second orifice passage by the biasing force of the coil spring, so that the second orifice passage is shut off. The valve body is separated from the equilibrium chamber side opening of the second orifice passage by the action of the magnetic field generated by energization of the coil against the biasing force of the coil spring. The second orifice passage is switched to the communication state.

  Therefore, in the fluid-filled vibration isolator having the structure shown in Patent Document 1, since the urging force of the coil spring is always applied to the valve body, the communication state of the second orifice passage is maintained. In order to do this, it is necessary to apply a holding force to the valve body by continuously energizing the coil to hold the valve body in a predetermined open operation position.

  However, if the continuous energization state of the coil is maintained for a long time, heat is generated due to the electrical resistance of the coil, and the durability is likely to be deteriorated due to heat, and the amount of power required Therefore, particularly when using a vehicle-mounted battery or the like as a power source, there is a possibility that the capacity of the battery is insufficient or the size thereof is increased.

  Further, in the fluid filled type vibration isolator according to Patent Document 1, by applying the biasing force of the coil spring to the valve body, the shut-off state of the second orifice passage is realized without being energized and requires energization. The valve body is held in the closed operation position. However, in such a structure, it is necessary to provide a special coil spring as a means for urging the valve body. Therefore, the structure becomes complicated due to an increase in the number of parts, and an extra coil spring assembly process is required. As a result, there was a problem that productivity was lowered.

JP 2004-150546 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is to switch the fluid flow path between a communication state and a cutoff state by controlling energization to the coil. An object of the present invention is to realize a fluid-filled vibration isolator having a novel structure in which a valve body is maintained in a target switching state without energizing a coil with a small number of parts.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

That is, according to 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 to enclose the incompressible fluid. Forming a pressure-receiving chamber and an equilibrium chamber in which a part of the wall is formed of a flexible membrane and enclosing an incompressible fluid, and the fluid is sealed by communicating the pressure-receiving chamber and the equilibrium chamber with each other by a fluid channel In the type vibration isolator, a coil that forms a magnetic field by energization is disposed, and a yoke member is assembled to the coil, and one magnetic pole is generated by energization of a direct current to the coil. One magnetic pole part and a second magnetic pole part are provided in the yoke member so as to be spaced apart from each other, and a movable valve element having a permanent magnet is provided between the first magnetic pole part and the second magnetic pole part. A DC power supply in the coil. By switching the energization direction, the movable valve body is driven and displaced using the attractive force and repulsive force of the magnetic force acting between the first magnetic pole part and the second magnetic pole part and the movable valve body. The fluid flow path is switched between a communication state and a shut-off state by the movable valve body, and both sides of the movable valve body in the drive displacement direction in the storage area in which the movable valve body is stored and arranged. A through-hole is formed in the wall portion at a position facing the movable valve body, and one of the through-holes is closed by the movable valve body, so that the fluid flow path is in a communication state and a shut-off state. While the communication hole is switched, the other through-hole is a through-hole provided outside the fluid flow path .

  In such a fluid-filled vibration isolator having a structure according to the present invention, a movable valve body that includes a permanent magnet is employed as a valve body that switches a fluid flow path between a communication state and a cutoff state. . Therefore, by generating one of the magnetic poles in the first and second magnetic poles by energizing the coil, an attractive force and a repulsive force are generated between the movable valve body and the first and second magnetic poles. By acting, the movable valve element can be driven and displaced.

  In addition, the driving direction of the movable valve element can be changed in the reverse direction by reversing the magnetic poles generated in the first and second magnetic pole portions by reversing the direction of the direct current flow in the coil. Therefore, the reciprocating displacement of the movable valve body can be easily realized by controlling the energization direction to the coil.

  Furthermore, since the movable valve body has a permanent magnet, the movable valve body is attracted to the closer side of either the first magnetic pole part or the second magnetic pole part when the coil is not energized. It has come to be. Therefore, even when the energization to the coil is stopped in the state where the fluid flow path is switched between the communication state and the shut-off state by energizing the coil, the magnetic force of the permanent magnet acts to The coil is held at the switching position when the energization of the coil is stopped, and it is possible to realize the switching of the desired vibration isolation characteristics by energizing only when the movable valve body is switched. ing. Therefore, it is possible to improve durability by suppressing heat generation by maintaining the energization state of the coil, and it is possible to reduce the amount of electric power required.

  In addition, by using the magnetic force of the permanent magnet as the holding force of the movable valve body, the holding force of the required magnitude can be stabilized compared to the case where the holding force is obtained by maintaining the energized state of the coil. Can be obtained. Therefore, the switched anti-vibration characteristics can be stably maintained, and the intended anti-vibration effect can be effectively obtained. Furthermore, since it is not necessary to provide a coil spring or the like as an urging means for holding the movable valve body in one of the switching states, an increase in the number of parts can be prevented, and the switching type can be realized with a simple structure. A fluid-filled vibration isolator can be realized.

  Moreover, in the fluid filled type vibration damping device according to the present invention, the movable valve body has columnar connecting portions, and the columnar connecting portions have action flange portions at both axial end portions, The working flange portion may be a pair of magnetic poles of a permanent magnet.

  Also by adopting the movable valve body having such a structure, the acting flange portion is a magnetic pole of the permanent magnet, so that the attractive force and the repulsive force due to the magnetic force acting between the first and second magnetic pole portions. Thus, both the reciprocating operation of the movable valve body by energization of the coil and the holding of the movable valve body at the switching position under non-energization can be effectively realized.

  Furthermore, in the fluid filled type vibration damping device according to the present invention including the movable valve body having the above-described structure, more preferably, the first magnetic pole part and the second magnetic pole part are opposed to each other with a predetermined distance therebetween. A pair is formed so as to be positioned, and any one of the working flange portions in the movable valve body is positioned between the first magnetic pole portion and the second magnetic pole portion, and the working flange portion Any one of the first magnetic pole part and the second magnetic pole part is positioned outside and opposed to the first magnetic pole part, and one of the first magnetic pole part and the second magnetic pole part. The columnar connecting portion is positioned through the through hole.

  According to this, a straight line acting on the movable valve body by efficiently acting the attractive force and the evacuation force by the magnetic force between the working flange portion which is a magnetic pole of the permanent magnet and the first and second magnetic pole portions. Advantageous driving force can be obtained.

  In the fluid filled type vibration damping device according to the present invention, the pressure receiving chamber and the equilibrium chamber are formed on both sides of a partition member supported by the second mounting member, and the fluid flow path Includes a first orifice passage formed in the partition member, and a second orifice passage formed in the partition member and tuned to a higher frequency than the first orifice passage. The two orifice passages may be switched between a communication state and a cutoff state by the movable valve body.

  Thus, in the fluid-filled vibration isolator having the double orifice structure having the first and second orifice passages as the fluid flow paths, the communication state and the shut-off state of the second orifice passage tuned to a higher frequency range can be achieved. By switching with a movable valve body that is reciprocated using the action of magnetic force, the vibration-proof effect against vibration in the frequency range in which the first orifice passage is tuned, and the frequency range in which the second orifice passage is tuned Both of the anti-vibration effects against vibrations can be effectively exhibited.

  Furthermore, in the fluid filled type vibration damping device according to the present invention including a partition member that separates the pressure receiving chamber and the equilibrium chamber, the coil and the yoke member are more preferably assembled to the partition member.

  According to this, by assembling the coil and the yoke member to the partition member separating the pressure receiving chamber and the equilibrium chamber, it is possible to suppress an increase in the size of the fluid-filled vibration isolator due to the provision of the coil and the yoke member. Therefore, it is possible to employ the switching type fluid-filled vibration isolator according to the present invention even when the installation space is limited, for example, in an engine mount of an automobile.

  Further, in the fluid filled type vibration damping device according to the present invention, the movable valve body includes the first magnetic pole portion or the first magnetic member in the yoke member at at least one position in the communication state and the cutoff state. A magnetic pole made of the permanent magnet may be formed in a portion brought into contact with the second magnetic pole portion.

  According to this, since the magnetic pole formed by the permanent magnet in the movable valve body is brought into direct contact with the first or second magnetic pole portion formed on the yoke member, the magnetic attractive force is more efficient. Can be demonstrated. In adopting such a structure, more preferably, both magnetic poles formed on the movable valve body are respectively connected to the first magnetic pole part and the second magnetic pole part of the yoke member. At the same time. As a result, the magnetic efficiency between the magnetic poles of the movable valve body and the first and second magnetic pole portions can be made to act simultaneously in a coordinated manner, thereby further improving the magnetic efficiency.

  Furthermore, as described above, in the fluid-filled vibration isolator according to the present invention in which the magnetic pole in the movable valve body is formed in the portion that is brought into contact with the first magnetic pole part or the second magnetic pole part, Preferably, a fluid communication hole is formed in the yoke member with respect to the first magnetic pole part or the second magnetic pole part, and the fluid flow path is formed including the fluid communication hole. The movable valve body is magnetically attracted and brought into contact with the formation portion of the fluid communication hole in the first magnetic pole part or the second magnetic pole part, so that the fluid communication hole is blocked by the movable valve body. Thus, a structure is adopted in which the fluid flow path is blocked.

  According to this, since the magnetic attraction force between the magnetic pole of the movable valve body and the first magnetic pole part or the second magnetic pole part acts most strongly around the fluid communication hole, the movable valve body The fluid flow path can be blocked more reliably.

  Further, in the fluid filled type vibration damping device according to the present invention, in the movable valve body, a displacement end that makes the fluid flow path in the communication state and a displacement that makes the fluid flow path the shut-off state At least one displacement end with respect to the end is defined by contact of the movable valve body with the first magnetic pole part or the second magnetic pole part, and the movable valve body and the first A contact portion with one magnetic pole portion or the second magnetic pole portion may be formed of an elastic cushioning material.

  According to this, since the movable valve body and the first magnetic pole part or the second magnetic pole part are brought into contact with each other via the elastic cushioning material, it is possible to suppress the occurrence of hitting sound and impact at the time of contact. it can.

  And in the fluid-filled vibration isolator according to the present invention configured to include the cushioning material as described above, a ferromagnetic material softer than the valve main body is used for the valve main body configured by a permanent magnet. It is desirable that the movable valve body is constituted by a composite structure in which the cushioning material is integrally formed.

  As a result, the magnetic characteristics of the valve main body can be expressed on the surface of the movable valve body made of the buffer material while exerting the mitigating action of the impact sound and shock by the buffer material. Alternatively, the magnetic attractive force between the second magnetic pole portions can be efficiently applied.

  Further, when the movable valve body is a composite structure composed of a valve main body and a buffer material as described above, more preferably, the composite valve body is magnetized with respect to the buffer material. The entire movable valve body is a magnet.

  Thereby, the magnetic attraction force between the movable valve body and the first magnetic pole part or the second magnetic pole part can be exhibited more advantageously while exhibiting soundproofing and shock absorbing action by the buffer material.

  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, FIGS. 1 and 2 show an automobile engine mount 10 as an embodiment of a fluid-filled vibration isolator according to the present invention. The engine mount 10 has a structure in which a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member are connected to each other by a main rubber elastic body 16. Yes. The first mounting bracket 12 is attached to a power unit (not shown) which is one member constituting the vibration transmission system, and the second mounting bracket 14 is the other member constituting the vibration transmission system (not shown). By being attached to the body of the automobile, the engine mount 10 is interposed between the power unit and the vehicle body, and the power unit is supported by the vehicle body in a vibration-proof manner.

  More specifically, the first mounting bracket 12 is a highly rigid member formed of iron, aluminum alloy, or the like, and has a columnar mounting portion 18. A bolt hole 20 that extends linearly on the central axis and opens at the upper end surface is formed in the mounting portion 18, and a screw thread is formed on the inner peripheral surface. Further, a flange portion 22 is formed at the lower end portion of the attachment portion 18 so as to extend to the outer peripheral side. Further, a fixing portion 24 that is hemispherical and protrudes downward is integrally formed below the attachment portion 18.

  On the other hand, the second mounting bracket 14 is made of the same metal material as that of the first mounting bracket 12 and has a thin cylindrical shape with a large diameter. In addition, a taper portion 26 that gradually expands as it goes upward is integrally formed in one opening portion of the second mounting bracket 14, and a flange-like portion that extends to the outer peripheral side is formed at the upper end of the taper portion 26. 28 is integrally formed. Moreover, the 1st latching claw 30 which bends and extends to the inner peripheral side is formed in the lower end edge part of the 2nd attachment metal fitting 14 over the perimeter.

  The first mounting bracket 12 and the second mounting bracket 14 are configured such that the first mounting bracket 12 and the second mounting bracket 14 are disposed on the same central axis, and the first mounting bracket 12 is the second mounting bracket 12. The mounting bracket 14 is spaced apart from the opening on which the tapered portion 26 is formed. The main rubber elastic body 16 is interposed between the first mounting metal 12 and the second mounting metal 14, and the first mounting metal 12 and the second mounting metal 14 are mutually connected by the main rubber elastic body 16. It is connected to.

  The main rubber elastic body 16 is a rubber elastic body having a large-diameter, generally frustoconical shape, and a large-diameter recess 32 is formed at the end on the large-diameter side. The large-diameter recess 32 has a substantially mortar shape in the reverse direction, and is opened at the end surface on the large-diameter side of the main rubber elastic body 16.

  Then, the fixing portion 24 of the first mounting bracket 12 is inserted into the end portion on the small diameter side of the main rubber elastic body 16, and the lower surface of the flange portion 22 is superimposed on the end surface on the small diameter side of the main rubber elastic body 16. By being bonded, the first mounting member 12 is fixed to the end portion on the small diameter side of the main rubber elastic body 16. Further, the inner peripheral surface of the upper portion of the second mounting bracket 14 is superimposed on the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 16 and vulcanized and bonded, so that the second mounting bracket 14 becomes the main rubber. The elastic body 16 is fixed to the end portion on the large diameter side. In the present embodiment, a stopper rubber integrally formed with the main rubber elastic body 16 is fixed to the upper surface and the outer peripheral surface of the flange portion 22 of the first mounting member 12.

  In this way, the first mounting bracket 12 and the second mounting bracket 14 are each vulcanized and bonded to the main rubber elastic body 16, and the first mounting bracket 12 and the second mounting bracket 14 are connected to the main body. The rubber elastic bodies 16 are elastically connected to each other. Thereby, in this embodiment, the main rubber elastic body 16 is formed as a first integral vulcanization molded product 34 that is integrally provided with the first mounting bracket 12 and the second mounting bracket 14.

  A seal rubber layer 36 is integrally formed at the lower end of the main rubber elastic body 16. The seal rubber layer 36 is formed of a thin-walled large-diameter rubber elastic body and extends downward from the opening peripheral edge of the large-diameter recess 32. The seal rubber layer 36 is vulcanized and bonded with the outer peripheral surface superimposed on the lower inner peripheral surface of the second mounting member 14. Thereby, the inner peripheral surface of the second mounting bracket 14 is covered with the rubber elastic body over substantially the entire axial direction.

  On the other hand, the engine mount 10 includes a diaphragm 38 as a flexible film. The diaphragm 38 is a thin rubber film having sufficient deflection in the axial direction, and has a substantially disk shape or a substantially circular dome shape as a whole. Also, a substantially annular annular fixed rubber 40 is integrally formed on the outer peripheral edge of the diaphragm 38. Further, the outer peripheral surface of the annular fixing rubber 40 is overlapped with the inner peripheral surface of the fixing fitting 42 and vulcanized and bonded. The fixing bracket 42 has a large-diameter, generally annular shape, and is formed of a metal material that can be deformed in a reduced diameter, like the second mounting bracket 14 in the present embodiment. In addition, the second locking claw 44 is integrally provided by bending the upper end edge of the fixing bracket 42 to the inner circumferential side over the entire circumference. In the present embodiment, the diaphragm 38 is formed as a second integral vulcanization molded product 46 that is integrally provided with a fixing bracket 42.

  The first integral vulcanized molded product 34 and the second integral vulcanized molded product 46 are attached to a partition member 48 shown in FIGS. The partition member 48 includes a partition member main body 50, an upper lid member 52, and a lower lid member 54.

  The partition member main body 50 has a thick circular block shape, and is formed of a hard synthetic resin material in the present embodiment. A central recess 56 that opens to the lower surface is formed in the central portion of the partition member main body 50.

  Moreover, the partition member main body 50 has a smaller diameter at both the upper and lower end portions than the intermediate portion in the axial direction, and the intermediate portion in the axial direction protrudes to the outer peripheral side. In the partition member main body 50, an upper locking groove 58 extending continuously over the entire circumference is formed at the lower end of the upper end portion having a small diameter. Furthermore, in the partition member main body 50, a lower locking groove 60 extending continuously over the entire circumference is formed at the upper end of the lower end portion having a small diameter.

  Further, an upper notch 62 is formed on the outer peripheral edge of the upper end of the partition member main body 50. The upper notch 62 opens to the upper end surface and the outer peripheral surface of the partition member main body 50, and continuously extends with a predetermined length in the circumferential direction with a substantially constant cross-sectional shape. On the other hand, a lower notch 64 is formed at the outer peripheral edge at the lower end of the partition member body 50. The lower notch portion 64 opens to the lower end surface and the outer peripheral surface of the partition member main body 50, and continuously extends with a predetermined length in the circumferential direction with a substantially constant cross-sectional shape. Moreover, the upper notch part 62 and the lower notch part 64 are extended in the circumferential direction by the same length of a little less than one round, and the edge part of the circumferential direction is mutually aligned. Further, one end of the upper notch 62 and the lower notch 64 is communicated with each other by a connection path 66 formed in the partition member main body 50.

  Further, an upper lid member 52 is overlapped and fixed to the upper end surface of the partition member main body 50. The upper lid member 52 covers the upper opening of the upper notch 62. Further, a lower lid member 54 is overlapped and fixed to the lower end surface of the partition member main body 50. The lower lid member 54 covers the lower opening of the lower notch 64. As described above, the upper cutout portion 62 and the lower cutout portion 64 each have a groove shape that opens in the outer peripheral surface of the partition member 48 and extends in the circumferential direction.

  As shown in FIG. 1, the partition member 48 formed by assembling the upper and lower lid members 52, 54 to the partition member body 50 has the first integral vulcanized molded product 34 and the second integral vulcanization. Each of the molded products 46 is assembled.

  That is, the upper end portion of the partition member main body 50 having a relatively small diameter is inserted from the lower opening of the second mounting bracket 14 constituting the first integral vulcanized molded product 34, and the second mounting is performed. A first locking claw 30 provided at the lower end of the metal fitting 14 is inserted into an upper locking groove 58 formed on the outer peripheral surface of the partition member main body 50. The first mounting vulcanized product 34 is fixed to the partition member 48 by subjecting the second mounting bracket 14 to diameter reduction processing such as eight-way drawing.

  On the other hand, the lower end portion of the partition member body 50 having a relatively small diameter is inserted from the upper opening of the fixing bracket 42 constituting the second integrally vulcanized molded product 46 and provided at the upper end of the fixing bracket 42. The second locking claw 44 is inserted into a lower locking groove 60 formed on the outer peripheral surface of the partition member main body 50. Then, the second integrally vulcanized molded product 46 is fixed to the partition member 48 by subjecting the fixing fitting 42 to diameter reduction processing such as eight-way drawing.

  As is clear from FIG. 1, the first locking claw 30 is locked in the upper locking groove 58, thereby positioning the first integral vulcanized molded product 34 and the partition member 48 in the axial direction. In addition, the second locking claw 44 is locked in the lower locking groove 60, whereby the second integral vulcanized molded product 46 and the partition member 48 are positioned in the axial direction.

  In addition, under the assembly of the first integral vulcanized molded product 34 and the second integral vulcanized molded product 46 to the partition member 48, between the axially opposed surfaces of the main rubber elastic body 16 and the partition member 48, A part of the wall portion is constituted by the main rubber elastic body 16, and a pressure receiving chamber 70 in which a variation in internal pressure is caused by elastic deformation of the main rubber elastic body 16 is formed using the large-diameter recess 32. . The lower end portion of the second mounting bracket 14 is in close contact with the outer peripheral surface of the partition member 48 through the seal rubber layer 36, and the pressure receiving chamber 70 is fluidly separated from the outside.

  Furthermore, between the diaphragm 38 and the partition member 48 between the axially opposed surfaces, a part of the wall portion is constituted by the diaphragm 38, and the equilibrium chamber 72 in which the volume change is allowed by elastic deformation of the diaphragm 38 is formed in the central recess. It is formed using the point 56. In short, the pressure receiving chamber 70 is formed on one side of the partition member 48 sandwiched in the axial direction, and the equilibrium chamber 72 is formed on the other side. The fixing bracket 42 is in close contact with the outer peripheral surface of the partition member 48 through the annular fixing rubber 40, and the equilibrium chamber 72 is fluid-tightly separated from the outside.

  Further, the pressure receiving chamber 70 and the equilibrium chamber 72 are provided by assembling the first integral vulcanized molded product 34 and the second integral vulcanized molded product 46 to the partition member 48 in an incompressible fluid. , Each of which contains an incompressible fluid. The incompressible fluid sealed in the pressure receiving chamber 70 and the equilibrium chamber 72 is not particularly limited. For example, water, alkylene glycol, polyalkylene glycol, silicone oil, and a mixture thereof are preferably used. Adopted. In particular, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less is desirable in order to effectively obtain an anti-vibration effect based on the resonance action of the fluid described later.

  Further, the second mounting bracket 14 is overlaid on the outer peripheral surface of the upper end portion of the partition member 48, so that the opening on the outer peripheral side of the upper notch 62 is covered with the second mounting bracket 14 and closed fluid-tightly. In addition, the fixing fitting 42 is overlapped in close contact with the outer peripheral surface of the lower end portion of the partition member 48, so that the opening on the outer peripheral side of the lower notch 64 is covered with the fixing fitting 42 and is fluid tight. Is blocked. Thus, the upper and lower cutouts 62 and 64 and the connection path 66 that communicates with each other are used to form a tunnel-like passage that is folded back in the circumferential direction and extends for a predetermined length.

  Further, a communication window 74 penetrating the outer peripheral edge of the upper lid member 52 is positioned at one end of the tunnel-shaped passage including the notches 62 and 64, and at the other end. The communication window 76 which penetrates the outer periphery part of the lower cover member 54 is located. One end portion of the tunnel-shaped passage is communicated with the pressure receiving chamber 70 through the communication window 74, and the other end portion is communicated with the equilibrium chamber 72 through the communication window 76. As a result, a first orifice passage 78 is formed as a fluid flow path that connects the pressure receiving chamber 70 and the equilibrium chamber 72 to each other using the tunnel-like passage.

  In the present embodiment, the resonance frequency of the fluid that flows through the first orifice passage 78 is effective against vibrations in a low frequency range of about 10 Hz corresponding to an engine shake or the like based on the resonance action of the fluid. It is tuned so as to exhibit an anti-vibration effect (high damping effect).

  As shown in FIGS. 1 and 2, a coil 80 is disposed inside the partition member main body 50. The coil 80 is disposed at the central portion in the radial direction of the partition member main body 50 so that the center hole extends in a direction orthogonal to the mount center axis. Further, the coil 80 is connected to a power supply fitting 82, and the power supply fitting 82 projected outside the partition member body 50 is connected to an external power source (not shown) so that a direct current can be supplied from an external power source. It has become. And the coil 80 forms a magnetic field around by energization of direct current.

  A central magnetic pole fitting 84 is inserted through the central hole of the coil 80. The central magnetic pole fitting 84 has a structure in which a magnetic pole forming portion 88 is provided on one side in the axial direction of the insertion portion 86 having a cylindrical shape, and a connecting portion 90 is provided on the other side in the axial direction.

  The insertion portion 86 is a portion inserted into the central hole of the coil 80 in the central magnetic pole fitting 84, and has a shape corresponding to the central hole of the coil 80. As shown in FIGS. 1 and 2, the magnetic pole forming portion 88 expands in a direction orthogonal to the central axis of the engine mount 10 and outwards from one end portion of the insertion portion 86. It has a flat plate shape that protrudes, and the tip portion has a substantially annular shape when viewed in the mount axis direction. Further, the connecting portion 90 has a substantially cylindrical shape having a smaller diameter than the insertion portion 86, and protrudes outward from the other end portion of the insertion portion 86 on the center line of the insertion portion 86.

  In the present embodiment, the coil 80 is set in the resin molding die of the partition member body 50 in a state where the central magnetic pole fitting 84 and the magnetic path fitting 92 are assembled to the coil 80, and the resin molding is performed. The partition member body 50 is formed as an integrally molded product including the coil 80, the central magnetic pole fitting 84, and the magnetic path fitting 92 by filling the mold with a resin material and molding.

  A magnetic path fitting 92 is assembled to the central magnetic pole fitting 84. As shown in FIG. 2, the magnetic path fitting 92 is a fitting that has a substantially U shape when viewed from the center axis direction of the engine mount 10, and is formed at the center in the width direction (vertical direction in FIG. 2). A small-diameter circular hole is formed. The magnetic path fitting 92 is fixed to the central magnetic pole fitting 84 by fitting the connecting portion 90 of the central magnetic pole fitting 84 into the circular hole. As shown in FIG. 2, in the assembled state of the central magnetic pole fitting 84 and the magnetic path fitting 92, the magnetic path fitting 92 extends separately on both sides in the width direction of the central magnetic pole fitting 84. A coil 80 is positioned between the metal fitting 92 and the insertion portion 86 of the central magnetic pole metal piece 84.

  Further, an upper magnetic pole fitting 94 and a lower magnetic pole fitting 96 that are opposed to each other at a predetermined distance in the mount axis direction are disposed at the tip portion of the magnetic path fitting 92. The upper magnetic pole bracket 94 is made of a ferromagnetic material such as iron, and has a flat plate shape extending in the direction perpendicular to the axis. The upper magnetic pole fitting 94 is attached to the partition member 48 by being overlapped and fixed to a part of the upper end surface of the partition member 48. The upper magnetic pole fitting 94 is attached to the partition member 48 at a position away from the upper lid member 52. Further, the upper end surface of the tip portion of the magnetic path fitting 92 is exposed to the outside from the partition member main body 50 at the attachment portion of the upper pole fitting 94, and the tip portion of the magnetic path fitting 92 is brought into contact with the upper pole fitting 94. It has been.

  The lower magnetic pole bracket 96 is formed of the same ferromagnetic material as the upper magnetic pole bracket 94, and has a flat plate shape extending in the direction perpendicular to the axis. Further, the lower magnetic pole bracket 96 is attached to the partition member 48 by being overlapped and fixed to a part of the lower end surface of the partition member 48. Further, the lower end surface of the tip portion of the magnetic path metal fitting 92 is exposed to the outside from the partition member main body 50 at the attachment portion of the lower magnetic pole metal fitting 96, and the front end portion of the magnetic path metal fitting 92 is brought into contact with the lower magnetic pole metal fitting 96. It has been.

  In the present embodiment, the central magnetic pole fitting 84, the magnetic path fitting 92, and the upper and lower magnetic pole fittings 94 and 96 are all made of a ferromagnetic material and are brought into contact with each other, and are connected to the coil 80. Magnetic flux generated by energization is carried along the central magnetic pole fitting 84, the magnetic path fitting 92, and the upper and lower magnetic pole fittings 94 and 96. As described above, in this embodiment, the central magnetic pole fitting 84, the magnetic path fitting 92, and the upper and lower magnetic pole fittings 94 and 96 are combined with each other, thereby forming a yoke fitting 97 as a yoke member that forms a predetermined magnetic path. The yoke fitting 97 is assembled around the coil 80 and incorporated in the partition member 48.

  Furthermore, in the present embodiment, by energization of the coil 80, a pair of magnetic pole forming portions 88 of the central magnetic pole fitting 84 and a pair of opening peripheral portions of the upper and lower magnetic pole fittings 94 and 96, which will be described later, and communication holes 100 and through-holes 117 are formed. Magnetic poles are formed, and the first and second magnetic pole portions in the present embodiment are formed by the magnetic pole forming portions 88 and the peripheral portions of the communication holes 100 and the through holes 117.

  An accommodation region 98 is formed between the axially opposed surfaces of the upper magnetic pole fitting 94 and the lower magnetic pole fitting 96. As shown in FIGS. 2 and 4, the housing region 98 is provided at the center portion in the width direction (vertical direction in FIG. 2) of the upper and lower magnetic pole fittings 94 and 96, and is internally incompressible Filled with fluid.

  Further, as shown in FIGS. 1 and 2, the tip end portion of the magnetic pole forming portion 88 constituting the central magnetic pole fitting 84 is protruded from the accommodation region 98. The magnetic pole forming portion 88 has a protruding tip surface positioned at a predetermined distance from the wall surface of the housing region 98, and an upper region and a lower region sandwiching the magnetic pole forming portion 88 in the housing region 98. The magnetic pole forming portion 88 is in communication with each other through the opposing surfaces of the tip surface of the magnetic pole forming portion 88 and the wall surface of the accommodating region 98. Further, the magnetic pole forming portion 88 is positioned at the center in the opposing direction between the opposing surfaces of the upper magnetic pole fitting 94 and the lower magnetic pole fitting 96, and the separation distance between the upper magnetic pole fitting 94 and the lower magnetic pole fitting 96 is mutually different. Are equal.

  Further, in the upper magnetic pole fitting 94 constituting the upper wall portion of the accommodating region 98, a circular fluid communication hole is formed in a portion overlapping the tip portion of the magnetic pole forming portion 88 having an annular plate shape by projection in the axial direction. The communication hole 100 is formed. The accommodation region 98 is communicated with the pressure receiving chamber 70 through the communication hole 100 formed through the upper magnetic pole fitting 94.

  Further, a communication hole 102 is formed through the bottom wall portion of the accommodation region 98 at a position away from the lower magnetic pole bracket 96. As shown in FIG. 2, the communication hole 102 is curved and extends in the circumferential direction. The accommodation region 98 is communicated with the equilibrium chamber 72 through the communication hole 102.

  As a result, the pressure receiving chamber 70 and the equilibrium chamber 72 are communicated with each other through the accommodation region 98 and the communication holes 100 and 102, and the second orifice passage as the fluid flow path in the present embodiment using the accommodation region 98. 104 is formed. Note that the resonance frequency of the fluid flowing through the second orifice passage 104 is tuned to a higher frequency than the first orifice passage 78. In this embodiment, idling vibration or the like is based on the resonance action of the fluid. Is tuned to exhibit an effective anti-vibration effect (low dynamic spring effect) against vibrations in the middle to high frequency range around 20 to 40 Hz.

  In addition, a magnetic valve element 106 as a movable valve element is disposed in the accommodation area 98. The magnetic valve body 106 in the present embodiment is configured to include a magnetized metal fitting 108 and a magnet member 110. The magnetic metal fitting 108 has a substantially disc shape as a whole, and is formed of a ferromagnetic material such as iron.

  The entire magnet member 110 is formed of a permanent magnet and is magnetized in the direction of the central axis of the engine mount 10. Further, the magnet member 110 in the present embodiment is integrally provided with a columnar connecting portion 112 and a lower magnetic pole flange portion 114 as an action flange portion. The columnar connecting portion 112 has a small-diameter columnar shape and extends in the mount axis direction. Further, the lower magnetic pole flange portion 114 is integrally formed with the columnar connecting portion 112 at the lower end portion of the columnar connecting portion 112, and protrudes to the outer peripheral side over the entire circumference. Since the columnar connecting portion 112 and the lower magnetic pole flange portion 114 are integrally formed, the magnet member 110 has a stepped cylindrical shape having a large lower end portion as a whole. The lower magnetic pole flange portion 114 has an outer diameter dimension substantially equal to that of the magnetized metal fitting 108.

  And the magnetic valve body 106 in this embodiment is comprised by arrange | positioning the magnetic metal fitting 108 and the magnet member 110 to the same center axis | shaft shape, and fixing mutually in an axial direction. The fixing method of the magnetic band member 108 and the magnet member 110 is not particularly limited. For example, the magnetic band member 108 and the magnetic member 110 may be fitted to each other by press fitting or the like. However, in this embodiment, by applying an adhesive to the overlapping surface of the magnetic band member 108 and the magnet member 110, the band member 108 and the magnet member 110 are bonded to each other. Yes.

  Under the assembly of the magnetic band member 108 and the magnet member 110, the outer peripheral edge of the magnetic band member 108 protrudes to the outer peripheral side from the columnar connecting part 112, and the working flange part is formed at the upper end of the columnar connecting part 112. The upper magnetic pole flange portion 116 is formed using the outer peripheral edge portion of the magnetized metal fitting 108. In short, the magnetic valve body 106 according to the present embodiment has a structure in which the upper magnetic pole flange portion 116 and the lower magnetic pole flange portion 114 are formed at both axial ends of the columnar connecting portion 112.

  Further, under the assembly of the magnetic band bracket 108 and the magnet member 110, the magnetic band bracket 108 is magnetized by the action of the magnetic field of the magnet member 110 formed of a permanent magnet, and the entire band magnetic bracket 108 and the magnet member 110 are combined into one. A magnetic field is formed as a permanent magnet. Since the lower magnetic pole flange portion 114 of the magnet member 110 and the upper magnetic pole flange portion 116 of the magnetic metal fitting 108 are provided at both ends in the axial direction that is the magnetization direction of the magnetic valve body 106, a pair of magnetic poles different from each other. It has become.

  In addition, the magnet member 110 and the magnetic metal fitting 108 are overlapped and fixed in a state where the columnar connecting portion 112 of the magnet member 110 is inserted through the central hole of the magnetic pole forming portion 88 of the central magnetic pole fitting 84, and the magnetic valve body is fixed. An upper magnetic pole flange portion 116 provided at the upper end portion of the magnetic pole body 106 is positioned between the opposing surfaces of the upper magnetic pole fitting 94 and the central magnetic pole fitting 84, and a lower magnetic pole flange portion provided at the lower end portion of the magnetic valve body 106. 114 is positioned between the opposed surfaces of the central magnetic pole fitting 84 and the lower magnetic pole fitting 96.

  Further, the thickness in the axial direction of the upper magnetic pole flange portion 116 in the magnetic band metal fitting 108 and the thickness in the axial direction of the lower magnetic pole flange portion 114 in the magnet member 110 are determined by the central magnetic pole fitting 84, the upper magnetic pole fitting 94, and the central magnetic pole fitting. 84 and the lower magnetic pole metal fitting 96 are sufficiently smaller than the distance between the opposing surfaces, and the outer diameter of the upper magnetic pole flange portion 116 and the outer diameter of the lower magnetic pole flange portion 114 are both of the central hole of the magnetic pole forming portion 88. It is larger than the inner diameter. As a result, the magnetic valve body 106 is assembled so that it cannot be pulled out in a state in which relative displacement is allowed by a predetermined distance in the axial direction with respect to the magnetic pole forming portion 88.

Here, the magnetic pole forming portion 88 of the central magnetic pole fitting 84, the upper magnetic pole fitting 94 and the lower magnetic pole fitting constituting the yoke fitting 97 by the action of a magnetic field formed by energizing the coil 80 from an external power source (not shown). When the pole is caused to 96, the magnetic valve body 106 which is formed by the permanent magnet, the attractive force by the magnetic force acting between the upper and lower pole flange portion 11 6, 11 4 and their pole fittings 84,94,96 The repulsive force can be driven to reciprocate in the axial direction.

  That is, when the coil 80 is energized from an external power source (not shown), one of the magnetic poles is generated in the magnetic pole forming portion 88 of the central magnetic pole fitting 84 by the action of the magnetic field formed by the coil 80, and the upper magnetic pole One of the other magnetic poles is generated in the metal fitting 94 and the lower magnetic pole metal fitting 96. In the present embodiment, the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94 and 96 are connected to each other by the magnetic path fitting 92 to constitute a yoke fitting 97 that forms a magnetic path. One of the magnetic poles is generated at a portion where the contact portion between the magnetic pole forming portion 88 and the magnetic path metal fittings 92 of the upper and lower magnetic pole fittings 94 and 96 is removed.

  Here, as shown in FIG. 5, when the magnetic pole generated in the magnetic pole forming portion 88 of the central magnetic pole fitting 84 is the same as the magnetic pole of the upper magnetic pole flange portion 116 in the magnetic valve body 106, The attraction force applied between the upper magnetic pole flange portion 116 and the upper magnetic pole fitting 94, between the lower magnetic pole flange portion 114 and the central magnetic pole fitting 84, and between the upper magnetic pole flange portion 116 and the central magnetic pole fitting 84, The magnetic valve element 106 is displaced axially upward (in the direction approaching the upper magnetic pole fitting 94) with respect to the yoke fitting 97 by the repulsive force applied between the magnetic pole flange portion 114 and the lower magnetic pole fitting 96. It has become.

  The upper magnetic pole flange portion 116 of the magnetic valve body 106 is brought into contact with the upper magnetic pole fitting 94, and the lower magnetic pole flange portion 114 is brought into contact with the central magnetic pole fitting 84, whereby the magnetic valve body 106 is moved in the operating direction. Stopped at the top. As a result, the magnetic valve body 106 covers and closes the communication hole 100 formed in the upper magnetic pole fitting 94 from below, and the second orifice passage 104 is blocked by the magnetic valve body 106.

Then, as shown in FIG. 6, when the current to the coil 80 was stopped and the magnetic poles of the central magnetic pole fitting 84, the upper magnetic pole fitting 94, and the lower magnetic pole fitting 96 disappeared, a permanent magnet was obtained. The magnetic valve body 106 is held in contact with the central magnetic pole fitting 84 and the upper magnetic pole fitting 94 by an attractive force based on magnetic force. That is, the magnetic valve body 106, by the upper and lower pole flange portion 11 6, 11 4 are a pair of magnetic poles, and between the upper pole flange portion 116 and the upper magnetic pole fitting 94, and the lower magnetic pole flange portion 114 central This is because an attractive force is applied between the pole pieces 84 .

  Next, as shown in FIG. 7, when the magnetic pole generated in the central magnetic pole fitting 84 is different from the magnetic pole of the upper magnetic pole flange 116 in the magnetic valve body 106, the upper magnetic pole flange 116 and the upper magnetic pole The repulsive force acting between the magnetic pole fitting 94, the lower magnetic pole flange portion 114 and the central magnetic pole fitting 84, the upper magnetic pole flange portion 116 and the central magnetic pole fitting 84, the lower magnetic pole flange portion 114 and the lower magnetic pole fitting, respectively. The magnetic valve element 106 is displaced axially downward (in the direction approaching the lower magnetic pole metal fitting 96) with respect to the yoke metal fitting 97 by the attractive force acting between the metal fittings 96.

Then, the upper magnetic pole flange portion 116 of the magnetic valve body 106 is brought into contact with the central magnetic pole fitting 84, and the lower magnetic pole flange portion 114 is brought into contact with the lower magnetic pole fitting 96, whereby the magnetic valve body 106 is moved in the operating direction. Stopped at the lower end. Thus, the communication hole 10 0 magnetic valve body 106 is formed in the upper pole fitting 94 is brought apart downward, by the communication hole 10 0 is in the communicating state, the second orifice passage 104 is communicated state It is said.

  In the present embodiment, a circular through-hole 117 is formed in a portion where the magnetic valve element 106 of the lower magnetic pole fitting 96 is overlapped. As a result, when the magnetic valve body 106 is displaced downward, the sealed fluid is released to the equilibrium chamber 72 side through the through hole 117, and a repulsive force by the fluid spring acts between the lower magnetic pole bracket 96 and the magnetic valve body 106. Can be effectively avoided.

Then, as shown in FIG. 8, when the current to the coil 80 was stopped and the magnetic poles of the central magnetic pole fitting 84, the upper magnetic pole fitting 94, and the lower magnetic pole fitting 96 disappeared, a permanent magnet was obtained. The magnetic valve body 106 is held in contact with the central magnetic pole fitting 84 and the lower magnetic pole fitting 96 by an attractive force based on magnetic force. That is, the magnetic valve body 106, by the upper and lower pole flange portion 11 6, 11 4 are a pair of magnetic poles, and between the upper pole flange portion 116 and the central magnetic pole bracket 84, and the lower magnetic pole flange portion 114 down This is because an attractive force is applied between the pole pieces 96.

  5 to 8 are schematic views for explaining the operation of the magnetic valve body 106. The structure shown in these drawings is a specific structure of the engine mount 10 shown in FIG. It is simplified compared to 5 and 8 indicate N and S poles of the magnetic poles. Furthermore, the arrows shown in FIGS. 5 and 7 indicate the driving direction of the magnetic valve element 106. Further, in FIGS. 5 to 8, a switch is shown on the lead wire connecting the external power source and the coil 80, but this switch shows the energization and non-energization of the coil 80 in an easy-to-understand manner. It does not indicate that the switching between the 80 energized state and the non-energized state can be realized only by such a switch.

  The automobile engine mount 10 having such a structure is attached to a power unit of an automobile (not shown) by a fixing bolt (not shown) in which the first mounting bracket 12 is screwed into the bolt hole 20, and a second attachment. By attaching the metal fitting 14 to a vehicle body (not shown) via a bracket member or the like to be externally fitted and fixed, the metal fitting 14 is interposed between the power unit and the vehicle body.

  When vibrations in a low frequency region such as an engine shake that becomes a problem during traveling are input while the engine mount 10 is mounted on the vehicle, a relatively large pressure fluctuation is generated in the pressure receiving chamber 70. The flow amount of the fluid through the first orifice passage 78 is secured by the difference in the relative pressure fluctuation generated between the pressure receiving chamber 70 and the equilibrium chamber 72, and the fluid action such as the resonance action of the fluid is achieved. Based on this, an anti-vibration effect (high damping effect) effective against low-frequency vibrations such as engine shake is exhibited.

  At that time, as shown in FIG. 1, the magnetic valve body 106 is held in a state of being positioned at the upper end in the reciprocating operation direction, and the opening of the second orifice passage 104 on the pressure receiving chamber 70 side. The communication hole 100 is closed by the magnetic valve body 106. As a result, the second orifice passage 104 is cut off, and fluid flows between the pressure receiving chamber 70 and the equilibrium chamber 72 through the second orifice passage 104, so that the hydraulic pressure in the pressure receiving chamber 70 is reduced to the equilibrium chamber 72. Therefore, it is possible to advantageously secure the amount of fluid flow through the first orifice passage 78 and to effectively obtain a vibration isolation effect based on the fluid flow action. ing.

  Further, when a vibration in the middle to high frequency range such as idling vibration which is a problem at the time of stopping or low-speed booming noise which is a problem at the time of traveling, a pressure fluctuation with a small amplitude is caused in the pressure receiving chamber 70. When such vibration is input, the magnetic valve body 106 is driven downward by energizing the coil 80 from an external power source, and a communication hole which is an opening of the second orifice passage 104 on the pressure receiving chamber 70 side. Separated from 100.

  As a result, as shown in FIG. 9, the opening of the second orifice passage 104 on the pressure receiving chamber 70 side is switched to the communication state, and the pressure receiving chamber 70 and the equilibrium chamber 72 are connected by the second orifice passage 104. Communicate with each other. The flow amount of the fluid through the second orifice passage 104 is ensured by the difference in relative pressure fluctuation generated between the pressure receiving chamber 70 and the equilibrium chamber 72, and the fluid action such as the resonance action of the fluid is achieved. Based on this, an anti-vibration effect (low dynamic spring effect) that is effective against medium to high frequency vibration such as vibration during idling is exhibited.

  In short, in the fluid filled type vibration damping device according to the present embodiment, the second orifice passage 104 is brought into the communication state and the cutoff state by controlling the energization direction to the coil 80 to reciprocate the magnetic valve element 106. By switching control, the image stabilization characteristic is switched according to the input vibration. In FIGS. 1 and 9, the stroke of the reciprocating operation of the magnetic valve element 106 is exaggerated and greatly shown for easy understanding.

  In such an automobile engine mount 10, the magnetic valve body 106 that switches the second orifice passage 104 between the communication state and the cutoff state is formed of a permanent magnet. Therefore, by controlling the polarity of the direct current supplied to the coil 80, the magnetic poles of the central magnetic pole fitting 84, the upper magnetic pole fitting 94, and the lower magnetic pole fitting 96 are appropriately changed, so that the magnet formed of a permanent magnet is used. By controlling the attractive force and the repulsive force acting with the valve body 106, the magnetic valve body 106 can be displaced toward both sides in the axial direction.

  Accordingly, the magnetic valve body 106 can be driven to reciprocate without providing the biasing means required in the conventional valve means for driving the movable valve body formed of a ferromagnetic material by attracting it with an electromagnet. Thus, the switchable engine mount 10 can be realized with a small number of parts. Furthermore, since an urging means such as a coil spring is not necessary, an assembling step of the urging means can be omitted at the time of manufacture, and productivity can be improved.

  In particular, in the present embodiment, the upper magnetic pole flange portion 116 is disposed between the opposing surfaces of the magnetic pole forming portion 88 of the central magnetic pole fitting 84 and the upper magnetic pole fitting 94, and the magnetic pole forming portion 88 of the central magnetic pole fitting 84 and the lower magnetic pole fitting 84 are arranged. A lower magnetic pole flange portion 114 is disposed between the 96 opposing surfaces. Thereby, the attractive force and the repulsive force by the action of magnetic force can be efficiently applied to the magnetic valve body 106, and the required driving force can be obtained with less power consumption.

  Further, since the magnetic valve body 106 is formed of a permanent magnet, the magnetic valve body 106 approaches the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94 and 96 by the action of magnetic force when the coil 80 is not energized. So as to be sucked. As a result, the holding force for holding the magnetic valve body 106 in the open operation position or the closed operation position under the non-energization of the coil 80 is exhibited by utilizing the magnetic force of the permanent magnet. Therefore, when the running state and the idling state are continuously maintained, the energization to the coil 80 can be stopped, and the heat generation and power consumption due to the continuous energization to the coil 80 can be stopped. Can be effectively prevented.

  In addition, by using the magnetic force of the permanent magnet as the holding force, a stable holding is realized and the anti-vibration characteristics are switched as compared with the case where the holding force is applied by maintaining the energization of the coil 80. Can be effectively maintained. This is because the holding force exerted by energizing the coil 80 may increase or decrease if the supply voltage to the coil 80 can be changed depending on various conditions such as temperature.

  In this embodiment, a partition member 48 that separates the pressure receiving chamber 70 and the equilibrium chamber 72 is provided, and the partition member main body 50 that constitutes the partition member 48 includes the coil 80, the central magnetic pole bracket 84, and the magnetic path bracket 92. The coil 80 that is an energized portion is disposed inside the partition member 48. As described above, since the coil 80 and the yoke fitting 97 are arranged on the inner peripheral side with respect to the second mounting fitting 14, it is possible to prevent the apparatus from becoming large and, for example, the engine mount 10 is a cylinder. Even in the case of being fitted to a shaped bracket metal fitting, it is possible to prevent the mounting from becoming difficult by providing the coil 80 and the yoke metal fitting 97.

  Next, FIG. 10 shows an engine mount 118 as a second embodiment of the present invention. In addition, in the following description, about the member or site | part substantially the same as the said embodiment, description shall be abbreviate | omitted by attaching | subjecting the same code | symbol in a figure.

  That is, in the engine mount 118, the central magnetic pole fitting 84 and the upper magnetic pole fitting 94, which are mutually connected at one end by the magnetic path fitting 92, are provided so as to face each other. One magnetic pole is generated in the magnetic pole forming portion 88 of the magnetic pole, and the other magnetic pole is generated around the communication hole 100 in the upper magnetic pole fitting 94.

  An abutting member 120 is disposed on the opposite side of the upper magnetic pole fitting 94 with the central magnetic pole fitting 84 interposed therebetween. The contact member 120 has a substantially flat plate shape and is a non-magnetic material formed of a hard synthetic resin material or the like. In the contact member 120, a circular through hole 117 is formed in a portion facing the communication hole 100 of the upper magnetic pole bracket 94 in the axial direction.

  Here, an accommodation region 98 is formed between the opposing surfaces of the upper magnetic pole fitting 94 and the contact member 120, and the communication hole 102 is located at a position where the contact member 120 is removed from the bottom wall portion of the accommodation region 98. Is formed through.

  The accommodation region 98 communicates with the pressure receiving chamber 70 through the communication hole 100 and also communicates with the equilibrium chamber 72 through the communication hole 102, whereby the second orifice communicating the pressure receiving chamber 70 and the equilibrium chamber 72 with each other. A passage 104 is formed.

  Further, the magnetic valve element 106 is accommodated in the accommodating area 98. In the magnetic valve body 106, the columnar connecting portion 112 is inserted into a through hole formed in the magnetic pole forming portion 88 of the central magnetic pole fitting 84, and the upper magnetic pole flange portion 116 is an opposing surface of the central magnetic pole fitting 84 and the upper magnetic pole fitting 94. The lower magnetic pole flange 114 is positioned between the opposed surfaces of the central magnetic pole fitting 84 and the contact member 120.

In the engine mount 118 having such a structure, when the coil 80 is energized to generate the same magnetic pole as the upper magnetic pole flange portion 116 in the magnetic pole forming portion 88 of the central magnetic pole fitting 84, the central magnetic pole fitting 84 and the lower magnetic pole flange portion are formed. The magnetic valve body 106 is moved upward by the attractive force acting between the upper magnetic pole fitting 94 and the upper magnetic pole flange portion 116 and the repulsive force acting between the central magnetic pole fitting 84 and the upper magnetic pole flange portion 116. The drive is displaced. Since the holding force exerted on the magnetic valve body 106 at the upper end in the operation direction is the same as that in the first embodiment, the description thereof is omitted.

When the coil 80 is energized and a magnetic pole different from the upper magnetic pole flange portion 116 is generated in the magnetic pole forming portion 88 of the central magnetic pole fitting 84, the upper magnetic pole fitting is provided between the central magnetic pole fitting 84 and the lower magnetic pole flange portion 114. The magnetic valve body 106 is driven and displaced downward by the repulsive force acting between the magnetic pole 94 and the upper magnetic pole flange portion 116 and the attractive force acting between the central magnetic pole fitting 84 and the upper magnetic pole flange portion 116 .

  In this state, when the magnetic valve body 106 is positioned at the lower end in the operation direction and the energization to the coil 80 is stopped and the magnetic poles of the central magnetic pole fitting 84 and the upper magnetic pole fitting 94 are eliminated, the magnetic pole is formed. In addition, an attractive force is applied between the upper magnetic pole flange portion 116 and the central magnetic pole fitting 84 formed of a ferromagnetic material. As a result, even when the coil 80 is not energized, the magnetic valve element 106 is held at the lower end in the operating direction using the attractive force due to the magnetic force as the holding force.

  Also in the engine mount 118 according to the present embodiment having such a structure, the same effects as those of the engine mount 10 shown in the first embodiment can be effectively obtained. Further, since the holding force when holding the second orifice passage 104 in the shut-off state can be obtained to the same extent as the engine mount 10 having the three magnetic pole portions shown in the first embodiment, the switching is performed. It is possible to stably maintain the anti-vibration characteristics.

  Although several embodiments of the present invention have been described above, these are merely examples, and the present invention is not construed as being limited to specific descriptions in such embodiments.

  For example, in the engine mounts 10 and 118 shown in the first and second embodiments, there are two cases where there are three magnetic pole portions where magnetic poles are generated by energizing the coil 80. However, it is sufficient that at least two magnetic pole portions are provided so that a pair of magnetic poles are generated, and four or more magnetic pole portions may be provided.

  Further, in the first and second embodiments, by combining the magnetic member 108 formed of a ferromagnetic material such as iron and the magnet member 110 formed of a permanent magnet, the magnetic member 108 is magnetized. The magnetic valve element 106 as a movable valve element, which is a single permanent magnet as a whole, is configured. However, for example, a disk-shaped permanent magnet can be used instead of the magnetic metal fitting 108. Moreover, you may comprise a movable valve body combining the permanent magnet of the same shape as the magnetism metal fitting 108 in the said embodiment, and the iron member of the same shape as the magnet member 110 in the said embodiment.

  Further, the shape and structure of the movable valve body are not limited at all by the specific shapes and structures shown in the first and second embodiments. For example, the movable valve body does not have to have a split structure like the magnetic valve body 106 shown in the first and second embodiments. For example, the first and second magnetic poles arranged separately from each other are used. A plate-shaped or block-shaped permanent magnet may be disposed between the portions, and the permanent magnet may be used as a movable valve body. Further, it is not necessarily required to be circular in the axial direction view.

  Further, in the first and second embodiments, the structure in which the magnetic valve body 106 has the upper magnetic pole flange portion 116 and the lower magnetic pole flange portion 114 is shown. For example, FIG. A single flange-like structure having only the upper magnetic pole flange portion 116 like the magnetic valve body 121 can also be adopted.

Also, by providing a shock absorbing rubber between the movable valve body and the first and second magnetic pole portions, abnormal noise and vibration caused by contact between the movable valve body and the first and second magnetic pole portions are reduced. You may be made to do. Specifically, for example, as shown in FIG. 12, the upper part of the valve main body 126 composed of the magnetic metal fitting 108 and the magnet member 110 having substantially the same structure as the first and second embodiments. The magnetic valve body 124 is attached to the rigid magnetic metal fitting 108 and the upper and lower surfaces of the magnetic pole flange portion 116 and the upper and lower surfaces of the lower magnetic pole flange portion 114 by fixing the buffer rubber 122 as an annular cushioning material, respectively. a valve body 126 made of magnetic member 110, made of cushion rubber 12 2 which soft, or as a composite structure. As a result, the magnetic valve body 124, the central magnetic pole fitting 84, and the upper and lower magnetic pole fittings 94, 96 are brought into contact with each other through the shock absorbing rubber 122 so as to reduce or avoid a hitting sound or the like at the time of contact. I can plan.

  In this way, when the magnetic valve body is a composite structure composed of a valve body made of a hard material and a soft buffer material, the buffer material is a general non-magnetic material such as rubber or synthetic resin. More preferably, the buffer material is formed of a ferromagnetic material or a permanent magnet. Specifically, for example, as another embodiment of the present invention, a magnetic metal fitting 108 and a magnet member 110 having a structure according to the first and second embodiments, such as a magnetic valve body 128 shown in FIG. A magnetic rubber 130 in which a permanent magnet powder such as a ferrite magnet is blended with a rubber material may be fixed as a buffer material to the valve body 126 composed of

  In the present embodiment, the magnetic rubber 130 is fixed to the upper and lower magnetic pole flange portions 116 and 114 of the valve body 126 with a substantially constant thickness so as to cover the entire surface of each flange portion 116 and 114. In addition, contact protrusions 132 are provided on both end surfaces in the axial direction, which are the contact portions between the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94 and 96 on the surface of the magnetic rubber 130. The contact protrusion 132 protrudes in the axial direction, which is the moving direction of the magnetic valve body 128, and is integrally formed with the magnetic rubber 130, and an annular ring continuously extending over the entire circumference of each flange portion 116, 114. It has a lip shape.

  Furthermore, in this embodiment, the magnetic rubber 130 is magnetized in accordance with the magnetic force characteristics in the axial direction of the valve main body 126, so that the entire magnetic valve body 128 including the valve main body 126 and the magnetic rubber 130 is used. Is a single permanent magnet. As a result, the magnetic poles of the entire magnetic valve body 128 are expressed in the magnetic rubber 130 that is brought into direct contact with the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94, 96. Magnetic attractive force and exclusion force between the metal fitting 84 and the magnetic poles generated in the upper and lower magnetic pole fittings 94 and 96 are made to act directly on each other. Further, in the present embodiment, the contact protrusion 132 is provided on the magnetic rubber 130, so that when the magnetic valve body 128 is in contact with the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94 and 96, By abutting the abutment protrusion 132 and then abutting the magnetic rubber 130 main body, a non-linear spring characteristic is exhibited, and the hitting sound and impact at the time of abutment are more advantageously mitigated. Yes.

  In the above-described embodiment, the magnetic rubber 130 is magnetized in accordance with the magnetic force characteristics in the axial direction of the valve body 126, but instead of the magnetized magnetic rubber 130, iron is used as the rubber material. A powder of a ferromagnetic material such as the above may be blended and used as a buffer material without being magnetized. Even when the buffer material is not magnetized, a magnetic pole is formed on the surface of the magnetic valve body 128 without reducing the magnetic flux density of the valve body 126 by blending the ferromagnetic material. Can do.

  Further, by using a magnetized buffer material such as the magnetic rubber 130, the magnetic force of the valve body can be supplemented by the magnetic force of the buffer material. As a result, for example, simple iron and low-priced magnets with low magnetic properties are used for the valve body, and a cushioning material with sufficient magnetic properties is used to switch and maintain the position of the valve body as a whole. It is also possible to ensure the necessary magnetic force.

As another specific example using the magnetic valve body formed by combining the valve main body and the cushioning material in this way, for example, like the magnetic valve body 134 shown in FIG. a valve body 136 made of plastic magnet rigid, or may be a buffer member 13 7 and comprising a combination composite structure as a buffer material made of soft plastic magnet.

An upper valve member 138 and a lower valve member 140, which have substantially the same structure as the magnetic metal fitting 108 and the magnet member 110 described in the first and second embodiments, respectively, are provided in the magnetic valve body 134. The upper and lower valve members 138 and 140 are made of plastic magnets formed by blending a synthetic resin material with permanent magnet powder such as a ferrite magnet. Further, the valve body 136 is provided with sufficient rigidity so as not to come out from the through hole 100 formed in the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94 and 96. On the other hand, the buffer member 13 7, of the valve body 136 is formed by a plastic magnet soft, it is fixed for the entire surface of the valve body 1 3 top and bottom 6 of the pole flanges 11 6, 11 4. Thus, slapping sound and shock during the abutment of the magnetic valve 134 is adapted to be relaxed by the elasticity of the cushioning member 13 7.

Then, these valve body 136 and the buffer member 13 7 whole is magnetized in the axial direction of the valve body 136 are a single permanent magnet, as a result, the magnetic poles in the magnetic valve body 134, a center pole It is formed in the buffer member 13 7 fittings 84 and the upper and lower pole fittings 94, 96 directly to the contact made to be the upper and lower pole flange portion 11 6, 11 around 4. Then, magnetic poles formed in such cushioning member 13 7, by being pole facing arrangement occurring in the center pole bracket 84 and the upper and lower magnetic pole fittings 94, 96, pole and the central pole bracket 84 of the magnetic valve body 134 In addition, the magnetic attraction force and the exclusion force between the magnetic poles of the upper and lower magnetic pole fittings 94 and 96 are allowed to directly interact with each other.

Thereby, in this embodiment, while adopting a plastic magnet that is lighter than a ferrite magnet, iron, or the like, between the magnetic pole of the magnetic valve element 134 and the magnetic poles of the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94, 96. Since the magnetic action can be efficiently exhibited, the magnetic valve element 134 and the upper and lower magnetic pole fittings 94 and 96 at the time of fluid pressure acting on the magnetic valve element 134 and the evacuation force and the attractive force necessary for switching the valve element position. It is possible to ensure a sufficient adhesion holding force. Moreover, a valve body 136 made of a hard plastic magnet, by a composite structure obtained by combining the cushioning member 13 7 made of a soft plastic magnet is employed, the deformation of the magnetic valve 134 by the stiffness of the valve body 136 and preventing the action of escape from a predetermined holding position with the effect of reducing impact and striking noise at the time of contact by the cushioning member 13 7 flexibility have been achieved by both. Also, particularly in this embodiment, by the upper and lower pole flange portion 11 6, 11 4 are formed to include a valve body 136 made of plastic magnet hard, exit is advantageously suppressed by the deformation of the magnetic valve body In addition, the stability and reliability of contact are ensured well.

In addition, the hardness of the various buffer materials listed so far, that is, the buffer material made of normal rubber or resin that is a non-magnetic material, or rubber or resin that is made of a ferromagnetic material, has sufficient buffer performance. The Shore A hardness is desirably 70 or less, and more preferably, the Shore A hardness is 50 or less. On the other hand, it is desirable that the valve body has a Shore A hardness of 80 or more in order to prevent the magnetic valve body from coming out of a predetermined holding position due to deformation. In addition, as long as the magnetic valve element can be a permanent magnet that can exhibit a sufficient magnetic force as a whole, the buffer material made of a non-magnetic material or a ferromagnetic material such as rubber or resin can be used as a permanent magnet or iron. It can be arbitrarily combined with a valve body made of any of the above materials. In addition, in the buffer material, when the ferromagnetic material is blended with rubber or synthetic resin material to make the ferromagnetic material, the ferromagnetic material is arbitrarily magnetized as necessary. But it is not essential. Furthermore, the specific shape of the cushioning material can be arbitrarily changed without any particular limitation.

Further, not the magnetic valve body side, but a normal rubber material, synthetic resin, or ferromagnetic material having no ferromagnetism at the contact portion of the central magnetic pole fitting 84 and the upper and lower magnetic pole fittings 94 and 96 with the magnetic valve body. It is also possible to provide a buffer member made of rubber, resin, or the like that is not magnetized so that the magnetic valve element and each member elastically contact each other. Further, even in the magnetic valve body having only one of the upper and lower magnetic pole flange portions 11 6 and 11 4 as shown in FIG. 11, a cushioning material can be provided. Specifically, for example, a buffer material may be provided at the lower axial end of the columnar connecting portion 112 in FIG. 11 so that the magnet member 110 and the lower magnetic pole metal fitting 96 abut against each other.

  In the first and second embodiments, the magnetic valve body 106 as a movable valve body is composed of a magnetic metal fitting 108 formed of a ferromagnetic material and a magnet member 110 formed of a permanent magnet. The entire magnetic valve body 106 is a permanent magnet. However, the movable valve body does not necessarily have to be a permanent magnet as a whole.

  Specifically, for example, the magnetic valve body 144 shown in FIG. 15 is formed of a hard synthetic resin material on both axial end surfaces of a magnet member 146 formed of a permanent magnet having a cylindrical shape. Thus, it is possible to adopt a structure in which a displacement limiting member 148 having a disk shape larger in diameter than the communication hole 100 is fixed. In such a magnetic valve body 144, by using a permanent magnet having a simple shape as the magnet member 146, the magnet member 146 can be easily manufactured, and the manufacturing cost of the vibration isolator can be reduced. I can do it. The inner diameter dimension of the communication hole 100 and the through hole 117 is made smaller than the outer diameter dimension of the magnet member 146, and the axial displacement of the magnet member 146 is caused by the contact between the magnet member 146 and the upper and lower magnetic pole fittings 94 and 96. In this case, the displacement limiting member 148 can be omitted.

  Furthermore, for example, as shown in FIG. 16, a permanent plate having a disk shape is formed on both sides of a disk-shaped connecting member 150 formed of a non-magnetic material such as a hard synthetic resin material or an aluminum alloy. The magnetic valve body 154 as a movable valve body can also be formed by fixing the magnet members 152a and 152b formed of magnets so that the same magnetic pole is on the outside. As is clear from this structure, the number of permanent magnets provided on the movable valve element is not necessarily one. The magnetic valve body 154 is disposed between the opposing surfaces of the magnetic pole forming portion 88 of the central magnetic pole fitting 84 and the upper magnetic pole fitting 94.

  In the first and second embodiments, the upper magnetic pole flange portion 116 is brought into contact with the upper magnetic pole fitting 94 at the upper end of the magnetic valve body 106 in the operation direction, and the lower magnetic pole flange portion 114. Can be brought into contact with the central magnetic pole fitting 84. However, it is not essential that the lower magnetic pole flange portion 114 is brought into contact with the central magnetic pole fitting 84 in a state where the magnetic valve body 106 is positioned at the upper end portion in the operation direction.

  Specifically, for example, like the magnetic valve body 156 shown in FIG. 17, the lower magnetic pole flange portion 114 and the central magnetic pole fitting 84 are separated by a predetermined gap: δ at the upper end in the operation direction of the magnetic valve body 156. And may be positioned. According to this, the lower magnetic pole flange portion 114 is brought into contact with the central magnetic pole fitting 84 and the upper magnetic pole flange in a state where the magnetic valve element 106 is located at the upper end in the operation direction due to a dimensional error during manufacturing. By avoiding the portion 116 from being separated from the upper magnetic pole fitting 94, the upper magnetic pole flange portion 116 and the upper magnetic pole fitting 94 can be brought into contact with each other more reliably. Therefore, the shut-off state of the second orifice passage 104 can be realized stably.

  The specific structures of the engine mounts 10 and 118 shown in the first and second embodiments are merely examples, and the structure of the fluid-filled vibration isolator according to the present invention is the first of them. The present invention is not construed as being limited in any way by the specific structure shown in the second embodiment. Specifically, for example, the fluid flow path may not necessarily be configured by two orifice passages, and may be configured by three or more orifice passages. Also, a movable film structure or a movable plate structure that transmits the hydraulic pressure in the pressure receiving chamber 70 to the equilibrium chamber 72 side can be provided. Furthermore, the coil 80 does not necessarily have to be incorporated in the partition member 48, and may be disposed outside the fluid chamber in which the incompressible fluid is sealed.

  Further, the fluid-filled vibration isolator according to the present invention is not necessarily employed only as an engine mount, and can be employed as a mount other than the engine, such as a body mount and a member mount. The present invention can be applied to a vibration isolator for various uses.

  Furthermore, the fluid-filled vibration isolator according to the present invention is not necessarily applied only to the fluid-filled vibration isolator for automobiles, and is applicable to, for example, engine mounts and member mounts for trains. Also, it can be suitably employed as a fluid-filled vibration isolator for various other uses.

  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.

II sectional drawing of FIG. 2 which shows the engine mount as 1st embodiment of this invention. II-II sectional drawing of FIG. The top view which shows the partition member of the engine mount. IV-IV sectional drawing of FIG. The model figure explaining the action | operation of the magnetic valve body in the engine mount. The model figure explaining the action | operation of the magnetic valve body. The model figure explaining the action | operation of the magnetic valve body. The model figure explaining the action | operation of the magnetic valve body. Sectional drawing which shows the communication state of the 2nd orifice channel | path in the said engine mount. Sectional drawing which shows the engine mount as 2nd embodiment of this invention. Sectional drawing which shows the principal part of the engine mount as another one Embodiment which concerns on this invention. Sectional drawing which shows the principal part of the engine mount as another one Embodiment which concerns on this invention. Sectional drawing which shows the principal part of the engine mount as another one Embodiment which concerns on this invention. Sectional drawing which shows the principal part of the engine mount as another one Embodiment which concerns on this invention. Sectional drawing which shows the principal part of the engine mount as another one Embodiment which concerns on this invention. Sectional drawing which shows the principal part of the engine mount as another one Embodiment which concerns on this invention. Sectional drawing which shows the principal part of the engine mount as another one Embodiment which concerns on this invention.

Explanation of symbols

10: engine mount, 12: first mounting bracket, 14: second mounting bracket, 16: rubber elastic body of main body, 70: pressure receiving chamber, 72: equilibrium chamber, 78: first orifice passage, 80: coil, 84: central magnetic pole fitting, 88: magnetic pole forming portion, 92: magnetic path fitting, 94: upper magnetic pole fitting, 96: lower magnetic pole fitting, 97: yoke fitting, 98: receiving area, 104: second orifice passage, 106: Magnetic valve body, 112: columnar connecting part, 114: lower magnetic pole flange part, 116: upper magnetic pole flange part

Claims (10)

The first mounting member and the second mounting member are connected by a main rubber elastic body, and a pressure receiving chamber in which a part of a wall portion is configured by the main rubber elastic body and incompressible fluid is enclosed, and a flexible In a fluid-filled vibration isolator in which a part of the wall portion is formed of a conductive film to form an equilibrium chamber in which an incompressible fluid is enclosed, and the pressure receiving chamber and the equilibrium chamber communicate with each other by a fluid flow path.
A coil that forms a magnetic field by energization is disposed, and a yoke member is assembled to the coil, and a first magnetic pole portion and a second magnetic pole portion in which one of the magnetic poles is generated by energization of a direct current to the coil. The two magnetic pole portions are provided spaced apart from each other in the yoke member, while a movable valve body having a permanent magnet is disposed between the first magnetic pole portion and the second magnetic pole portion, By switching the energization direction of the direct current in the coil, the movable valve element utilizes the first magnetic pole part and the magnetic attractive force and the repulsive force acting between the second magnetic pole part and the movable valve element. And the fluid flow path is switched between a communication state and a shut-off state by the movable valve body , and
A through hole is formed in each of the wall portions on both sides in the drive displacement direction of the movable valve body in a housing area where the movable valve body is housed and disposed, at a position facing the movable valve body. Is closed by the movable valve body so that the fluid flow path is a communication hole that is switched between a communication state and a shut-off state, while the other through hole is provided away from the fluid flow path. A fluid-filled vibration isolator characterized by the above.
  The movable valve body has columnar connecting portions, the columnar connecting portions have action flange portions at both axial end portions, and the action flange portions serve as a pair of magnetic poles of a permanent magnet. Item 2. A fluid-filled vibration isolator according to Item 1.   A pair is formed such that the first magnetic pole part and the second magnetic pole part are opposed to each other with a predetermined distance, and any one of the working flange parts in the movable valve body is the first magnetic pole part. It is positioned between the opposing of the second magnetic pole portion, and either one of the working flange portions is positioned on the outer side between the opposing of the first magnetic pole portion and the second magnetic pole portion. Furthermore, the fluid-filled vibration isolator according to claim 2, wherein the columnar connecting portion is positioned so as to penetrate either one of the first magnetic pole portion and the second magnetic pole portion.   The pressure receiving chamber and the equilibrium chamber are formed on both sides of a partition member supported by the second mounting member, and the fluid channel is formed in a first orifice passage formed in the partition member, and A second orifice passage formed in the partition member and tuned to a frequency higher than that of the first orifice passage, wherein the second orifice passage is communicated and blocked by the movable valve body; The fluid-filled vibration isolator according to any one of claims 1 to 3, wherein the fluid-filled vibration isolator is capable of being switched to.   The fluid filled type vibration damping device according to claim 4, wherein the coil and the yoke member are assembled to the partition member.   In the movable valve body, at least one position in the communication state and the shut-off state, a portion of the yoke member that is brought into contact with the first magnetic pole part or the second magnetic pole part is The fluid-filled vibration isolator according to any one of claims 1 to 5, wherein a magnetic pole is formed by a permanent magnet.   A fluid communication hole is formed with respect to the first magnetic pole part or the second magnetic pole part of the yoke member, the fluid flow path is formed including the fluid communication hole, and the first When the movable valve body is magnetically attracted and brought into contact with the formation portion of the fluid communication hole in the magnetic pole part or the second magnetic pole part, the fluid communication hole is closed by the movable valve body and the fluid The fluid-filled vibration isolator according to claim 6, wherein the flow path is blocked.   In the movable valve body, at least one displacement end of a displacement end that makes the fluid flow path in the communicating state and a displacement end that makes the fluid flow path in the blocking state is the first displacement end. The movable valve body is defined by contact with the magnetic pole part or the second magnetic pole part, and the movable valve body is in contact with the first magnetic pole part or the second magnetic pole part. The fluid filled type vibration damping device according to any one of claims 1 to 7, wherein the portion is formed of an elastic cushioning material.   9. The movable valve body is constituted by a composite structure in which the cushioning material is integrally formed of a ferromagnetic material softer than the valve body with respect to the valve body constituted by a permanent magnet. The fluid-filled vibration isolator described in 1.   The fluid-filled vibration isolator according to claim 9, wherein the movable valve body, which is a composite structure, is magnetized by being magnetized with respect to the buffer material.

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