JP2010078057A - Fluid-sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid-sealed vibration control device for a novel structure having excellent reliability and durability and capable of attaining an effective vibration control effect and size reduction to a wider frequency area. <P>SOLUTION: The passage length of an orifice passage 86 is variably constituted by relatively rotatably combining a second orifice member 54 with a first orifice member 52. While arranging a driven side magnetic pole 78 in the second orifice member 54, a driving part 120 forming a driving side magnetic pole 122 is arranged in an outdoor position opposed to the driven side magnetic pole 78 by sandwiching the wall of a balancing chamber 50. The passage length of the orifice passage 86 can be changed and set by transmitting a driving force to the second orifice member 54 using an actuator 88, using the magnetic force acting between the driving side magnetic pole 122 and the driven side magnetic pole 78. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is applied to, for example, an engine mount, and more particularly to a fluid-filled vibration isolator that obtains a vibration isolating effect by using a flow action of an incompressible fluid sealed inside. Is.

  2. Description of the Related Art Conventionally, there has been known an anti-vibration device that is interposed between members that constitute a vibration transmission system and that makes these members mutually anti-vibration connected or anti-vibration supported. Such an anti-vibration device has been studied for use in, for example, an engine mount that supports an automobile power unit in an anti-vibration manner on a vehicle body.

  By the way, an automobile engine mount is required to have a high level of vibration isolation performance in order to improve riding comfort. In order to meet such a demand, a fluid-filled vibration isolator using a fluid action such as a resonance action of an incompressible fluid has been proposed. As is well known, this fluid-filled vibration isolator has a structure in which an incompressible fluid is enclosed by communicating a main liquid chamber and a sub liquid chamber, which are subjected to relative pressure fluctuations when vibration is input, through an orifice passage. The anti-vibration effect can be exhibited by the resonant action of an incompressible fluid that can flow through the orifice passage.

  In addition, an automobile engine mount is required to have anti-vibration performance against a plurality of types of vibrations such as different frequencies and amplitudes depending on the engine speed, the running state of the vehicle, and the like. However, although the orifice passage can provide excellent anti-vibration performance against vibrations in a pre-tuned frequency range, it is notable for vibrations in a high frequency range exceeding the tuning frequency due to anti-resonance action. There has been a problem in that high vibration springs are caused and the vibration-proof performance is greatly reduced.

  Therefore, conventionally, as described in, for example, Patent Documents 1 to 3 (Japanese Patent Laid-Open No. 2002-364700, Japanese Utility Model Laid-Open No. 5-52394, Japanese Utility Model Laid-Open No. 61-66243), etc. A structure has been proposed in which an orifice passage extending in the relative rotational direction is formed by two combined orifice forming members, and the length of the orifice passage is variable by the relative rotation of the two orifice forming members. According to such a variable structure of the orifice passage length, it is possible to adjust the tuning frequency of the orifice passage, and to obtain an anti-vibration effect against a plurality of types of vibrations having different frequencies.

  However, in the conventional variable orifice path length structures as described in Patent Documents 1 to 3, an electric motor is mounted outside the mount body and rotated by the electric motor in order to rotate the orifice forming member. A driving force transmission member that transmits the driving force of the electric motor to the orifice forming member disposed in the mount body is inserted through from the outside of the fluid chamber such as the main liquid chamber or the sub liquid chamber. There was a need to do.

  Therefore, the sealing structure for penetrating the driving force transmitting member while ensuring the liquid tightness is complicated, and there is a possibility that the durability and reliability may be lowered or the manufacturing may be difficult. In addition, even if a slight misalignment occurs between the orifice forming member and the driving force transmission member due to bending of the driving force transmission member or the like, a malfunction may occur or the number of manufacturing steps may be increased in order to align the shaft with high accuracy. There is a risk of further increase, and there are still many problems in practical use.

JP 2002-364700 A Japanese Utility Model Publication No. 5-52394 Japanese Utility Model Publication No. 61-66243

  Here, the present invention has been made in the background as described above, and the problem to be solved is an effective anti-vibration effect for vibrations of a wide frequency with higher reliability and durability. It is an object of the present invention to provide a fluid-filled vibration isolator having a novel structure.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, according to the first aspect of the present invention, the first mounting member and the second mounting member are connected by the main rubber elastic body, while a part of the wall portion is configured by the main rubber elastic body so that the vibration is input. A pressure receiving chamber in which pressure fluctuation is induced, and an equilibrium chamber in which a part of the wall is formed by a flexible membrane and volume change is allowed, and an incompressible fluid is enclosed in the pressure receiving chamber and the equilibrium chamber. In addition, in the fluid-filled vibration isolator that connects the pressure receiving chamber and the equilibrium chamber to form an orifice passage that allows fluid flow, it is uniaxial with respect to the first orifice member supported by the second mounting member. The second orifice member is combined so as to be relatively rotatable around, and a circumferential passage is formed in the combined portion of the first orifice member and the second orifice member so as to extend in the relative rotation direction. Aisle A first communicating hole communicated with one of the pressure receiving chamber and the equilibrium chamber at one end in the direction, and communicated with the other of the pressure receiving chamber and the equilibrium chamber at the other circumferential end of the circumferential passage. The orifice passage is formed by forming a second communication hole, and the second orifice member is rotated relative to the first orifice member to form the first communication hole. The passage length of the orifice passage is made variable by changing the circumferential separation distance on the circumferential passage with the second communication hole, while the driven portion is provided on the second orifice member. A driven-side magnetic pole portion is formed on the periphery of the second orifice member around the rotation center axis of the driven portion, and a partition wall portion made of a nonmagnetic material is provided on the wall portion of the equilibrium chamber, Outdoor position facing the driven part across the partition Provided with an actuator for rotating the drive unit on the same central axis as the driven part, and on the circumference of the drive unit facing the driven part around the rotation center axis. The drive side magnetic pole is formed on the drive side, and the rotational driving force of the actuator is transmitted from the drive to the driven part using the magnetic force acting between the drive side magnetic pole and the driven side magnetic pole. Thus, the length of the orifice passage can be adjusted by changing the relative rotational position of the second orifice member with respect to the first orifice member.

  According to this aspect, by changing the relative rotational position of the second orifice member with respect to the first orifice member, the passage length of the orifice passage can be changed and set. Tuning can be changed over a wide frequency range. For example, when idling, the length of the orifice passage is set short and the resonance frequency in the liquid of the orifice passage is tuned to a high frequency range such as idling vibration, while the length of the orifice passage is set long when traveling. By tuning the resonance frequency in the liquid in the orifice passage to a low frequency range such as engine shake, it is based on the resonance effect of the fluid that can flow through the orifice passage for both high and low frequency vibrations. An effective anti-vibration effect can be obtained. Further, even at idling, for example, when the engine is started or the air conditioner is turned on, the engine speed is higher than the rated speed, and the input vibration frequency changes. Therefore, according to this aspect, by changing the length of the orifice passage, the resonance frequency in the liquid of the orifice passage can be made to follow the change of the input vibration frequency. By changing and controlling the resonance frequency of the passage in the liquid, a more accurate vibration isolation effect can be obtained. As a result, it is possible to obtain an effective anti-vibration effect over a plurality of frequency bands or a wider frequency range with a single orifice passage having excellent space efficiency, and a compact design can be achieved.

  And according to this aspect, the change setting of the passage length of the orifice passage is performed on the driven side magnetic pole portion provided in the second orifice member disposed in the fluid sealing region and outside the fluid sealing region. This is performed by driving and controlling the second orifice member inside from the outside of the fluid sealing region by utilizing the magnetic force action with the arranged drive side magnetic pole portion. Thereby, the second orifice member and the actuator for driving the second orifice member can be physically and independently disposed inside and outside the fluid sealing region. Therefore, unlike the conventional structure, it is not necessary to provide a driving force transmission member that transmits the driving force from the actuator to the orifice member through the inside and outside of the fluid sealing region. And reliability can be dramatically improved. Furthermore, since the second orifice member and the actuator are not mechanically connected, even if a slight displacement in the direction perpendicular to the rotation axis occurs between the drive unit and the driven unit, the driving force of the actuator Can be transmitted to the second orifice member, and this also makes it possible to improve the reliability and durability of the operation. In addition, even when such a positional deviation occurs, self-return to the intended position can be achieved by the magnetic action of the driving side magnetic pole part and the driven side magnetic pole part. Furthermore, it is not necessary to dispose the driving force transmission member through the inside and outside of the fluid sealing area, and a slight displacement between the second orifice member and the actuator is allowed, so that the assembly can be performed with high accuracy. Since alignment is not required, the number of assembling steps can be reduced.

  In addition, the orifice channel | path in this aspect may be formed only by the circumferential direction channel | path formed with the 1st and 2nd orifice member, and may be formed including the circumferential direction channel | path in part.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator according to the first aspect, the partition wall portion is formed of a hard material and is fixedly assembled to the second mounting member. It is characterized by that.

  According to this aspect, by configuring a part of the wall portion of the equilibrium chamber, which is easily deformed, with the partition wall portion made of a hard material, it is possible to improve the durability of the partition wall portion, and to drive and drive the partition wall portion. Can reduce the sliding resistance. In addition, by fixing the partition wall to the second mounting member in a fixed manner, the partition wall can be accurately positioned with respect to the drive unit and the driven unit, and the partition wall unit is deformed along with the deformation of the equilibrium chamber. Is strongly prevented from hitting the driving part and the driven part, and durability is improved. Here, the partition wall portion does not necessarily have to be directly fixed to the second mounting member, for example, an actuator housing or bracket fixed to the second mounting member, or the first orifice. It may be fixed to a member or the like. As the hard material, various materials can be appropriately employed as long as they are non-magnetic materials. For example, not only metal materials such as aluminum and copper but also synthetic resin materials such as polypropylene and polytetrafluoroethylene are appropriately used. It can be adopted.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator according to the first or second aspect, the inner and outer surfaces of the partition wall, the driven portion overlapped with the inner surface of the partition wall, and the Each of the opposing surfaces of the drive unit that is superimposed on the outer surface of the partition wall is formed with a flat surface that is orthogonal to the rotation center axis of the second orifice member.

  According to this aspect, even when a positional deviation in the direction orthogonal to the rotation axis occurs between the driving unit and the driven unit, it is possible to further reduce the possibility that the driving unit or the driven unit hits the partition wall. This can reduce the risk of malfunction due to the relative displacement between the drive unit and the driven unit.

  According to a fourth aspect of the present invention, in the fluid filled type vibration damping device according to any one of the first to third aspects, the inner and outer surfaces of the partition wall and the inner surface of the partition wall are overlapped. The driving unit and the opposing surfaces of the driving unit that are superimposed on the outer surface of the partition wall are overlapped with a gap, respectively.

  According to this aspect, the drive unit and the driven unit are not in contact with the partition wall. As a result, the sliding resistance between the driving unit and the driven unit and the partition wall is reduced or eliminated, and the driving force transmission efficiency, the operational stability, and the durability can be improved.

  According to a fifth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to fourth aspects, the driving unit and the driven unit include the driving-side magnetic pole on each facing surface. And the driven-side magnetic pole portion are characterized in that at least one N pole and one S pole are provided at each corresponding position on the circumference. According to this aspect, not only the attractive force due to the different polarity but also the repulsive force due to the same polarity can be used between the driving portion and the driven portion, and more excellent positioning stability and driving force transmission efficiency can be obtained. Can be obtained.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to fifth aspects, the driving unit and the driven unit are formed of a plastic magnet, and the driving side The magnetic pole part and the driven-side magnetic pole part are formed integrally with the driving part and the driven part, respectively. In this way, the number of parts can be reduced compared to the case where a separate permanent magnet is fixed to or embedded in the drive unit or the driven unit, and the manufacturing man-hours and manufacturing costs can be reduced. I can plan. In addition, since the magnetic pole portions are formed integrally with each of the driving portion and the driven portion, the magnetic pole portions can be accurately aligned by aligning the driving portion and the driven portion.

  According to a seventh aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to sixth aspects, a relative rotational central axis of the first orifice member and the second orifice member A rotation support shaft extending upward is provided to fix the rotation support shaft to one of the first orifice member and the second orifice member, and the first orifice member and the second orifice member. The rotating support shaft is inserted into the other of the orifice members so as to be rotatable. In this way, the second orifice member can be stably rotated relative to the first orifice member about the rotation support shaft, and the passage length of the orifice passage can be changed and adjusted with higher accuracy. I can do it.

  According to an eighth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to seventh aspects, the second attachment member has a cylindrical portion, and the cylindrical shape The first mounting member is spaced apart on one opening side of the portion, and the first mounting member and the second mounting member are connected by the main rubber elastic body, thereby one of the cylindrical portions. The opening is closed in a fluid-tight manner, and the other opening of the cylindrical portion is closed in a fluid-tight manner by a flexible rubber film as the flexible membrane, while being supported by the cylindrical portion. And the opposing surface of the main rubber elastic body and the flexible rubber film is partitioned by a partition member that extends in a direction perpendicular to the axis of the cylindrical portion, and the partition member and the main rubber elastic body The pressure receiving chamber is formed between the partition member and the flexible rubber film, and the equilibrium chamber is formed between the partition member and the flexible rubber film. The first orifice member is formed by a portion of the partition member fixed to the cylindrical portion, and the second orifice member is formed in the cylindrical shape with respect to the first orifice member. The partition wall is provided at the central portion of the flexible rubber film, and the partition wall is formed in the cylindrical shape with respect to the second orifice member. And the actuator is disposed on the opposite side of the balance chamber across the partition wall, and the partition wall is fixed to the housing of the actuator. And the housing of the actuator is fixedly supported by the second mounting member.

  In this way, the pressure receiving chamber and the equilibrium chamber can be formed on both sides of the partition member with good space efficiency, and the first orifice member is formed of the partition member, so that the fluid-filling type is compact as a whole. An anti-vibration device can be realized. Further, the partition wall portion is fixedly supported by the second mounting member via the actuator housing, so that the partition wall portion can be accurately positioned with respect to the driving portion and the driven portion, and the balance chamber can be provided. Even when the volume changes, the displacement of the central portion of the flexible rubber film provided with the partition wall can be suppressed, and the durability of the flexible film can be improved.

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

  First, FIG. 1 shows an automobile engine mount 10 according to a fluid-filled vibration isolator as a first embodiment of 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 elastically connected by a main rubber elastic body 16. The first mounting bracket 12 is attached to the power unit of the automobile, while the second mounting bracket 14 is attached to the body of the automobile, so that the power unit is supported to be vibration-proof with respect to the body. In the following description, the vertical direction means the vertical direction in FIG. 1 that is the axial direction of the engine mount 10 unless otherwise specified.

  More specifically, the first mounting member 12 has a substantially frustoconical shape in the opposite direction, and an outer peripheral protrusion 18 that extends to the outer peripheral side is formed in an axially intermediate portion. Further, a bolt hole 20 opening upward is formed on the central axis of the first mounting bracket 12, and the first mounting bracket 12 is illustrated by a fixing bolt (not shown) screwed into the bolt hole 20. Not to be fixed to the power unit of the car.

  On the other hand, the second mounting bracket 14 has a generally cylindrical shape with a large diameter as a whole having a cylindrical portion 22, and the upper end portion thereof is a tapered cylindrical portion that gradually expands toward the end in the axial direction. 24. In addition, a stepped portion 26 extending toward the outer peripheral side is formed at the lower end of the second mounting bracket 14, and a cylindrical caulking portion extending downward is formed on the outer peripheral edge of the stepped portion 26. 28 is integrally formed.

  The first mounting bracket 12 is arranged on the substantially same central axis as the second mounting bracket 14 and is spaced apart from the opening side of one of the cylindrical portions 22 (upward in FIG. 1). A main rubber elastic body 16 is interposed between the first mounting bracket 12 and the second mounting bracket 14. The main rubber elastic body 16 is formed of a rubber elastic body having a thick, large-diameter, generally frustoconical shape, and has an inverted mortar shape or hemispherical shape at its large-diameter side end. A large-diameter recess 30 that opens toward the top is formed. The first mounting bracket 12 is inserted into the small-diameter end of the main rubber elastic body 16 and vulcanized and bonded, and the outer peripheral surface of the large-diameter end of the main rubber elastic body 16 is The second mounting bracket 14 is overlapped with the inner peripheral surface and vulcanized and bonded. As a result, the first mounting bracket 12 and the second mounting bracket 14 are elastically connected to each other by the main rubber elastic body 16, and the opening in the axial direction above the cylindrical portion 22 in the second mounting bracket 14. Is closed fluid-tightly by the main rubber elastic body 16, and in the present embodiment, the main rubber elastic body 16 integrally includes the first mounting bracket 12 and the second mounting bracket 14. It is formed as a molded product.

  A thin seal rubber layer 32 is formed on the inner peripheral surface of the second mounting member 14 as a covering rubber layer that is integrally formed with the main rubber elastic body 16 and extends downward from the opening edge of the large-diameter recess 30. It is deposited. Furthermore, a stepped portion 34 that extends in the direction perpendicular to the axis is formed at an axially intermediate portion of the seal rubber layer 32, and the axially lower portion across the stepped portion 34 is thinner than the axially upward portion.

  Further, a diaphragm 36 as a flexible film is attached to the integrally vulcanized molded product of the main rubber elastic body 16. The diaphragm 36 is formed of a rubber elastic body having a thin and substantially annular plate shape, and is sufficiently slackened in the axial direction. Further, a fixed metal fitting 38 having a substantially annular plate shape in which the outer peripheral edge is raised over a predetermined dimension is vulcanized and bonded to the outer peripheral edge of the diaphragm 36.

  On the other hand, a partition wall member 40 as a partition wall is vulcanized and bonded to the inner peripheral edge of the diaphragm 36. The partition member 40 is made of a non-magnetic hard material that does not easily deform. Here, the partition member 40 is not particularly limited as long as it is a non-magnetic material. For example, not only a metal material such as aluminum or copper but also a synthetic resin material such as polypropylene or polytetrafluoroethylene is appropriately employed. In this embodiment, it is made of a nonmagnetic resin material. As shown in FIG. 2, the partition wall member 40 in the present embodiment has a bottomed cylindrical shape that opens downward, and the outer surface 41 and the inner surface 42 of the central portion of the partition wall member 40 are both partition wall members 40. It is set as the flat surface orthogonal to the axial direction. In addition, a fitting protrusion 43 that protrudes radially inward over the entire circumference is formed at the lower end portion of the inner circumferential surface of the partition wall member 40.

  The inner peripheral edge of the diaphragm 36 is overlapped and vulcanized and bonded so as to cover substantially the entire outer peripheral surface of the partition wall member 40. Note that the diaphragm 36 extends to the outer peripheral portion of the upper surface 41 of the partition wall member 40, and the central portion of the upper surface 41 of the partition wall member 40 is exposed to the outside. As a result, the diaphragm 36 is an integrally vulcanized molded product having the fixing bracket 38 at the outer peripheral portion and the partition member 40 at the central portion.

  Then, the diaphragm 36 is inserted into the lower end opening of the second mounting bracket 14 until the fixing bracket 38 is positioned at the stepped portion 26, and is caulked and fixed to the caulking portion 28. It is fixed to. As a result, the axially lower opening of the cylindrical portion 22 in the second mounting bracket 14 is fluid-tightly covered with the diaphragm 36, and the main rubber elastic body that covers both axial sides of the second mounting bracket 14. A fluid chamber 44 in which an incompressible fluid is enclosed is formed between the axially opposed surfaces of 16 and the diaphragm 36.

  The incompressible fluid sealed in the fluid chamber 44 is not particularly limited, but water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is preferably used. obtain. Further, in order to advantageously obtain a vibration isolation effect based on the fluid flow action described later, it is desirable to employ a low viscosity fluid having a viscosity of 0.1 Pa · s or less as the sealed fluid.

  Further, a partition member 46 is accommodated in the fluid chamber 44 so as to spread in a direction perpendicular to the axis. As a result, the fluid chamber 44 is divided in the axial direction with the partition member 46 interposed therebetween, and on the upper side with the partition member 46 sandwiched, a part of the wall portion is constituted by the main rubber elastic body 16, and at the time of vibration input. A pressure receiving chamber 48 in which pressure fluctuations are generated is formed, and on the lower side across the partition member 46, a part of the wall portion is constituted by the diaphragm 36, and an equilibrium chamber 50 in which volume change is allowed is provided. Is formed. That is, the fluid chamber 44 in which the incompressible fluid is sealed is partitioned into the pressure receiving chamber 48 and the equilibrium chamber 50 by the partition member 46, and the pressure receiving chamber 48 and the equilibrium chamber 50 are filled with the incompressible fluid. Has been. Particularly in the present embodiment, the equilibrium chamber 50 is formed including an annular groove 70 of the second orifice member 54 described later.

  The partition member 46 includes a first orifice member 52 and a second orifice member 54. The first orifice member 52 is formed of a hard member such as a metal material or a synthetic resin material, preferably a non-magnetic member, and has a substantially bottomed cylindrical shape that opens downward, and has an outer periphery at the end of the opening. A positioning protrusion 58 is formed on the surface so as to slightly protrude radially outward.

  Further, on the outer peripheral surface of the first orifice member 52, a circumferential groove 60 is formed that opens outward and extends with a predetermined length of about a half circumference in the circumferential direction. A communication hole 62 that opens above the first orifice member 52 is formed at one circumferential end of the circumferential groove 60. In addition, a plurality of communication slits 64 (see FIG. 4) are formed in the inner peripheral side wall portion of the circumferential groove 60 so as to penetrate the first orifice member 52 in the radial direction and extend with a predetermined dimension in the circumferential direction. A reinforcing bar 66 is formed between the communication slits 64 adjacent in the circumferential direction, and the upper and lower sides sandwiching the communication slit 64 in the first orifice member 52 are connected by the reinforcing shallower 66. .

  Further, a shaft insertion hole 56 penetrating in the thickness direction is formed in the central portion of the first orifice member 52, and the shaft insertion hole 56 has a substantially cylindrical shape and has an upper end in the axial direction. A bearing 67 having an enlarged diameter is inserted and assembled from above.

  On the other hand, the second orifice member 54 has a substantially bottomed cylindrical shape that opens downward, and a central central portion 68 that protrudes in the opening direction is formed at the central portion of the second orifice member 54. Around the protrusion 68, an annular concave groove 70 is formed which is continuously opened downward over the entire circumference. A communication window 72 penetrating in the radial direction of the second orifice member 54 is formed in a part of the outer circumferential wall portion of the second orifice member 54 in the circumferential direction. Further, a shaft insertion hole 74 penetrating in the axial direction is provided on the central axis of the second orifice member 54, and the diameter dimension of the shaft insertion hole 74 is assembled to the first orifice member 52. The inner diameter of the bearing 67 is substantially equal. A locking stepped portion 76 that extends radially outward is formed at the lower end portion of the shaft insertion hole 74, and the shaft insertion hole 74 has a larger diameter below the locking stepped portion 76. Further, the projecting end surface 78 of the central projecting portion 68 is a flat surface extending in the direction perpendicular to the axis.

  Here, the second orifice member 54 is an integrally molded product made of a plastic magnet that is injection molded by mixing magnetic powder such as ferrite powder with a resin material, for example, as shown in FIG. In addition, the magnetic poles are magnetized so as to appear on the protruding end surface 78 of the central protrusion 68. Particularly in the present embodiment, the pair of N poles and the pair of S poles are opposed to each other in the radial direction of the projecting end surface 78, and the N pole and the S pole are equal in the circumferential direction around the shaft insertion hole 74 at the projecting end surface 78. It can be expressed alternately at a distance. Thus, in the present embodiment, a driven portion is formed by the central protrusion 68 and a driven-side magnetic pole portion is formed on the periphery of the shaft insertion hole 74 on the protruding end surface 78 of the central protrusion 68. The driven part and the driven side magnetic pole part are integrally formed.

  The second orifice member 54 having such a structure is assembled to the opening of the first orifice member 52 in an insertion state in which the opening directions are equal. In the present embodiment, the first orifice member 52 and the second orifice member 54 are positioned on the same axis, and the shaft member 80 serving as the rotation support shaft is connected to the shaft insertion hole 74 of the second orifice member 54. And it is inserted from below into a bearing 67 provided in the shaft insertion hole 56 of the first orifice member 54. Here, a locking projection 82 that projects radially outward is formed at the lower end of the shaft member 80, and the locking step 76 of the second orifice member 54 is formed by the locking projection 82. It is designed to be locked. Then, a disc-shaped locking plate 84 having an outer diameter larger than the inner diameter of the bearing 67 is fixed to the upper end surface of the shaft member 80 by welding, adhesion, or the like, so that the shaft member 80 comes out of the bearing 67. Impossible. In particular, in the present embodiment, the shaft member 80 is fixedly provided to the first orifice member 52 by fixing the locking plate 84 to the bearing 67 by adhesion or the like, while the second plate The orifice member 54 is rotatably inserted into the shaft insertion hole 74. As a result, the second orifice member 54 is non-fixedly assembled with the shaft member 80 suspended from the first orifice member 52, and is coaxial with the first orifice member 52. The shaft member 80 is relatively rotatable around the shaft member 80.

  In the assembled state of the first orifice member 52 and the second orifice member 54, the outer peripheral surface of the second orifice member 54 is positioned to face the inner peripheral surface of the first orifice member 52 with almost no gap. At the same time, the communication window 72 formed in the second orifice member 54 overlaps the communication slit 64 formed in the first orifice member 52 in the radial direction. As a result, the communication slit 64 is covered with the outer peripheral wall portion of the second orifice member 54 and is communicated with the inside in the radial direction through the communication window 72, so that the second orifice member 54 is rotated. Thus, the communication position of the communication slit 64 and the communication window 72 can be changed in the circumferential direction of the first orifice member 52.

  Then, the partition member 46 having such a structure is inserted into the cylindrical portion 22 of the second mounting bracket 14 from the lower opening, and the upper end surface of the first orifice member 52 becomes the seal rubber layer 32. A fixing fitting 38 provided with a diaphragm 36 is inserted into the cylindrical portion 22 from the lower opening portion while being overlapped with the formed step portion 34 in the axial direction, and the first orifice member 52 is inserted. The lower end surface of the fixed member 38 is overlapped with the upper end surface of the fixture 38 through the outer peripheral portion of the diaphragm 36. As a result, the first orifice member 52 is sandwiched between the stepped portion 34 and the fixture 38 and positioned in the axial direction. Then, the diameter of the second mounting bracket 14 is reduced and the caulking portion 28 is caulked, so that the outer peripheral surface of the first orifice member 52 passes through the seal rubber layer 32 and the second mounting bracket 14. The first orifice member 52 is fitted and supported on the cylindrical portion 22 via the seal rubber layer 32 by being pressed against the cylindrical portion 22. As a result, the partition member 46 spreads in the direction perpendicular to the axis of the tubular portion 22 and is fitted and supported by the tubular portion 22. The second orifice member 54 can be rotated relative to the first orifice member 52 around the central axis of the cylindrical portion 22.

  Further, the circumferential groove 60 opened on the outer peripheral surface of the first orifice member 52 is covered with the seal rubber layer 32 in a fluid-tight manner. As a result, using the circumferential groove 60 formed in the combination portion of the first orifice member 52 and the second orifice member 54, the relative rotation direction of the first orifice member 52 and the second orifice member 54, in other words, In this case, an orifice passage 86 is formed that extends in the circumferential direction of the partition member 46 with a length of approximately half a circumference, and one end portion in the circumferential direction of the orifice passage 86 is connected to the pressure receiving chamber 48 through the communication hole 62. At the same time, the other end is connected to the equilibrium chamber 50 through a communication slit 64 formed in the first orifice member 52 and a communication window 72 formed in the second orifice member 54. As described above, in the present embodiment, the first communication hole is formed including the communication hole 62, and the second communication hole is formed including the communication slit 64 and the communication window 72. The pressure receiving chamber 48 and the equilibrium chamber 50 communicate with each other through the orifice passage 86, and fluid flow between the pressure receiving chamber 48 and the equilibrium chamber 50 is allowed.

  There, the orifice passage 86 rotates the second orifice member 54 around the shaft member 80 to change the circumferential position with respect to the first orifice member 52, so that the communication slit 64 and the communication window 72 intersect. The passage length can be changed by changing the position in the circumferential direction, and the tuning frequency set by the ratio (A / L) of the passage cross-sectional area (A) and the passage length (L) is set. It is possible to adjust according to the frequency of the input vibration.

  For example, as schematically shown in FIG. 4, by reducing the length of the orifice passage 86 as shown in FIG. 4A, an effective anti-vibration effect can be obtained in a high frequency range such as idling vibration. In addition to tuning, by increasing the length of the orifice passage 86 as shown in FIG. 4B, tuning can be performed so as to obtain an effective anti-vibration effect in a low frequency region such as engine shake. Further, by setting an appropriate passage length between the passage length shown in FIG. 4A and the passage length shown in FIG. 4B, the tuning frequency of the orifice passage 86 is set between the engine shake and the idling vibration. It is also possible to set to an appropriate frequency.

  The orifice passage 86 is tuned by, for example, the rigidity of the wall springs of the pressure receiving chamber 48 and the equilibrium chamber 50, that is, the elasticity of the main body rubber corresponding to the amount of pressure change required to change the chambers 48 and 50 by a unit volume. This can be done by adjusting the passage length and passage cross-sectional area of the orifice passage 86 while taking into account the characteristic values based on the respective elastic deformation amounts of the body 16 and the diaphragm 36, and is generally transmitted through the orifice passage 86. The frequency at which the phase of the pressure fluctuation changes and becomes a substantially resonant state can be grasped as the tuning frequency of the orifice passage 86.

  An electric motor 88 as an actuator is provided in the outdoor space of the fluid chamber 44 opposite to the center protrusion 68 and the equilibrium chamber 50 of the second orifice member 54 with the partition wall member 40 provided on the diaphragm 36 interposed therebetween. It is arranged. In the present embodiment, a conventionally known stepping motor is used as the electric motor 88, and output shafts 92 on which permanent magnets 90 are fixedly extrapolated are bearings 96 provided at both upper and lower ends of the case 94. The structure is configured to be rotatable around the central axis, and a plurality of coils 98 are provided on the inner surface of the case 94 at predetermined intervals in the circumferential direction. The rotation angle of the output shaft 92 can be adjusted by controlling energization of each coil 98 provided in the circumferential direction.

  The rotation angle of the output shaft 92 is adjusted, for example, by electrically connecting the electric motor 88 to the drive circuit 100 provided outside the engine mount 10 and connecting the drive circuit 100 to the engine ECU 104 via the control circuit 102. This is done by electrical connection. The drive circuit 100 is a power supply circuit that is electrically connected to the power supply of the electric system of the automobile and energizes the electric motor 88 in accordance with a control signal from the control circuit 102. The control circuit 102 is electrically connected to the engine ECU 104, and requires control data such as the engine operating state such as the rotational speed, the throttle opening, the mission position, the acceleration, and the running / stopped state from the engine ECU 104. The electric motor 88 is appropriately adopted, generates a control signal in accordance with the target control mode, and controls the electric motor 88 through the drive circuit 100. Note that the energization control to the electric motor 88 by the control circuit 102 is performed by using map control based on preset control data, or by using the vibration detection signal of the member to be shaken as an error signal, adaptive control, etc. This can be performed by performing feedback control.

  The electric motor 88 is fixed to the housing 106 in the accommodated state. The housing 106 is preferably a hard member formed of a nonmagnetic metal material or a synthetic resin material, and has a substantially inverted cup shape in which a housing recess 108 that opens downward is formed. Further, an upper projecting portion 110 projecting upward is integrally formed at the center of the upper end surface of the housing 106, and a fitting outer peripheral wall portion 112 projecting further upward is formed on the outer peripheral portion of the upper projecting portion 110. It is integrally formed over the entire circumference. A fitting recess 114 is formed over the entire circumference below the fitting outer peripheral wall 112 on the outer peripheral surface of the upper protrusion 110.

  Then, the electric motor 88 is inserted from the lower opening of the housing 106, and the case 94 of the electric motor 88 is fixed to the inner surface of the housing recess 108 by press-fitting or bonding. Here, a concave portion 116 that opens downward is formed in the central portion of the upper bottom portion of the accommodating concave portion 108, and a bearing 96 provided at the upper end portion of the case 94 is fitted into the concave portion 116. . The output shaft 92 is protruded upward from the upper end surface of the housing 106 through a shaft insertion hole 118 penetrating from the center of the recess 116 to the upper end surface of the housing 106.

  Furthermore, a rotating plate 120 as a drive unit is provided at the end of the output shaft 92 that protrudes from the upper end surface of the housing 106. The rotary plate 120 has a predetermined thickness dimension, and has a substantially cylindrical block shape having a diameter dimension substantially equal to the diameter dimension of the central protrusion 68 of the second orifice member 54, and the upper end surface 122 is perpendicular to the axis. The flat surface extends in the direction. Here, similarly to the second orifice member 54, the rotary plate 120 is an integrally molded product formed of a plastic magnet, and is magnetized so that a magnetic pole is developed on the upper end surface 122. In particular, in the present embodiment, a pair of N poles and a pair of S poles are opposed to each other in the radial direction of the rotating plate 120, similarly to the central protrusion 68 of the second orifice member 54 schematically shown in FIG. Thus, the N pole and the S pole are alternately developed in the circumferential direction around the central axis of the rotating plate 120 on the upper end surface 122. Thus, in the present embodiment, the drive-side magnetic pole portion is integrally formed with the rotating plate 120 by the upper end surface 122.

  The rotating plate 120 is coaxially fixed to the output shaft 92 of the electric motor 88 by adhesion, welding, or the like. In FIG. 1, the upper end surface of the output shaft 92 is superimposed on the lower end surface of the rotating plate 120, but it is of course possible to insert the output shaft 92 into the rotating plate 120 and fix it. As a result, the rotating plate 120 can rotate about the central axis integrally with the output shaft 92 in a state where a gap is provided between the upper end surface of the housing 106 and the inner peripheral surface of the fitting outer peripheral wall portion 112. .

  On the other hand, the outer peripheral surface of the lower end of the housing 106 has a tapered shape that spreads outward in the radial direction as it goes downward, and a disc-shaped lid member 124 is superimposed on the lower end surface of the housing 106 for adhesion or By fixing by welding or the like, the opening of the accommodation recess 108 is covered.

  The electric motor 88 having such a structure is fixed to the outer housing 128 in the accommodated state via the support plate 126. The outer housing 128 has a substantially cup shape having a housing recess 130 opened upward, and a flange-like portion 132 projecting radially outward is integrally formed at the upper edge of the opening peripheral portion. Has been. The electric motor 88 is fixed to the outer housing 128 via the support plate 126 so that the output shaft 92 is coaxial with the outer housing 128 at the central portion of the bottom surface of the housing recess 130. In addition, a plurality of fixed leg portions 134 are welded to the outer peripheral surface of the outer housing 128. The fixed leg portions 134 are fixed to the vehicle body with a fixing bolt or the like (not shown) so that the outer housing 128 extends in the first position. The second mounting bracket 14 is fixed to the vehicle body.

  Then, the outer housing 128 is inserted into the lower end opening of the second mounting bracket 14, and the upper end surface of the flange-shaped portion 132 is overlapped with the lower end surface of the fixing bracket 38 provided on the outer peripheral portion of the diaphragm 36, It is caulked and fixed to the second mounting bracket 14 by the caulking portion 28 together with the fixing bracket 38 and the like. As a result, the housing 106 of the electric motor 88 is fixedly supported by the second mounting bracket 14, and the rotation shaft 120 of the rotating plate 120 fixed to the output shaft 92 and the output shaft 92 of the electric motor 88 is The orifice member 54 is assembled so as to substantially coincide with the rotation center axis. In the outer housing 128, an appropriate number of air holes penetrating in the thickness direction are formed at appropriate positions, and the inner space of the outer housing 128 surrounded by the diaphragm 36 and the outer housing 128 is communicated with the outside. It is preferable that the deformation of the diaphragm 36 is not hindered.

  In such an assembled state, the fitting outer peripheral wall 112 provided on the housing 106 of the electric motor 88 is inserted from below the partition member 40 provided on the diaphragm 36, and the fitting recess 114 and the partition member of the housing 106 are inserted. Forty fitting protrusions 43 are fitted together. As a result, the partition wall member 40 is coaxially fixed to the fitting outer peripheral wall portion 112 of the housing 106, and the partition wall member 40 is fixedly attached to the second mounting bracket 14 via the housing 106 and the outer housing 128. Arranged. Then, the rotating plate 120 is disposed in the housing space formed between the housing 106 and the partition member 40, so that the rotating plate 120 has a central protrusion of the second orifice member 54 across the partition member 40. It will be disposed in the outdoor space of the fluid chamber 44 facing the portion 68.

  In this case, the central protrusion 68 of the second orifice member 54 and the rotary plate 120 are positioned coaxially opposite to the central axis of the cylindrical portion 22 with the partition wall member 40 interposed therebetween, and particularly in this embodiment. As shown in FIG. 2, the protruding end surface 78 of the central protrusion 68 is positioned with a predetermined gap in the axial direction with respect to the upper surface 41 of the partition wall member 40, and the upper end surface 122 of the rotating plate 120. However, the central protrusion 68 and the rotating plate 120 are both in a non-contact state with respect to the partition member 40 by being spaced apart from the lower surface 42 of the partition member 40 by a predetermined gap in the axial direction. It is made to oppose.

  The second orifice member 54 is centered by applying a magnetic attraction force between different poles and a magnetic repulsion force between the same poles between the upper end surface 122 of the rotating plate 120 and the projecting end surface 78 of the central protrusion 68. The rotary plate 120 and the central protrusion 68 are positioned at a predetermined relative position in the circumferential direction by being rotated around the axis. As a result, a magnetic acting force is exerted between the upper end surface 122 and the projecting end surface 78, and the rotational driving force of the electric motor 88 is transferred from the rotary plate 120 disposed outside the fluid chamber 44 to the inside of the fluid chamber 44. The rotary plate 120 and the second orifice member 54 can be driven to rotate on the same central axis by transmitting to the second orifice member 54 disposed in a non-contact state, and an electric motor By adjusting the rotation amount of the output shaft 92 of 88, the relative rotation amount of the second orifice member 54 with respect to the first orifice member 52, in other words, the passage length of the orifice passage 86 can be adjusted. Has been.

  In the engine mount 10 having such a structure, for example, in the idling state, the rotating plate 120 is rotated by the electric motor 88, and the second orifice member 54 is rotated as shown in FIG. Be positioned. Thereby, the passage length of the orifice passage 86 is set to a passage length that can exhibit an effective vibration-proofing effect against idling vibration. As a result, based on the fluid action such as the resonance action of the fluid flowing through the orifice passage 86 between the pressure receiving chamber 48 and the equilibrium chamber 50, an effective vibration insulation effect due to the low dynamic spring characteristic against high frequency vibration such as idling vibration is exhibited. The

  Therefore, for example, when the air conditioner is turned on even in the idling state, the engine speed is increased, and the frequency of the input vibration is shifted to the high frequency side compared to the state where the air conditioner is turned off. To do. In such a case, the rotating plate 120 is rotated by the electric motor 88, and the second orifice member 54 is rotated so that the passage length of the orifice passage 86 becomes shorter than the position shown in FIG. It is placed in the moving position. Thereby, the tuning frequency of the orifice passage 86 is changed and set to a higher frequency side. As a result, the tuning frequency of the orifice passage 86 can be made to respond to a slight change in the input vibration frequency under idling conditions, and an effective vibration insulation effect can be maintained.

  On the other hand, when the running of the automobile is started, the rotating plate 120 is rotated by the electric motor 88, and the second orifice member 54 is positioned at the rotating position shown in FIG. Thereby, the passage length of the orifice passage 86 is set to a passage length that can exhibit an effective vibration-proofing effect against the engine shake. As a result, an effective high damping effect against low-frequency vibration such as engine shake is exhibited based on the fluid action such as the resonance action of the fluid flowing through the orifice passage 86 between the pressure receiving chamber 48 and the equilibrium chamber 50.

  As described above, according to the engine mount 10 in the present embodiment, the tuning frequency of the orifice passage 86 can be changed according to the traveling state or the like. As a result, the single orifice passage 86 can provide an effective anti-vibration effect over a plurality of frequency ranges from the low frequency range to the high frequency range. Further, as described above, even a slight change in the idling vibration frequency due to ON / OFF of the air conditioner can be dealt with by changing the tuning frequency of the orifice passage 86, and within a specific frequency range. It is also possible to obtain a more accurate vibration isolation effect. As described above, according to the present embodiment, it is possible to obtain an effective vibration isolation effect over a plurality of or wider frequency ranges by the single orifice passage 86, and the engine mount 10 can be made compact. I can do it.

  In particular, in the present embodiment, the second orifice members 54 that determine the passage length of the orifice passage 86 are mutually connected based on the magnetic acting force with the rotating plate 120 disposed in the external space of the fluid chamber 44. It can be rotated in a non-contact state. As a result, the second orifice member 54 and the rotating plate 120 can be physically and independently disposed inside and outside the fluid chamber 44, and the driving force transmitting member that transmits the driving force to the second orifice member 54. It is also unnecessary to dispose the fluid chamber 44 through the inside and outside of the fluid chamber 44, which can be manufactured more easily, and the sealing performance and durability of the fluid chamber 44 can be improved.

  Furthermore, since the second orifice member 54 and the rotating plate 120 are not mechanically connected to each other, even if a slight axial deviation occurs between them, the connection state by the magnetic action force is maintained, The self-returning action by such a magnetic acting force can also be exhibited. As a result, it is possible to obtain superior durability and reliability, and it is not necessary to align the second orifice member 54 and the rotating plate 120 with high accuracy, so that the assembly is made easier. I can do it.

  Furthermore, since the central protrusion 68 and the rotating plate 120 are not in contact with the partition member 40, the sliding resistance with respect to the partition member 40 can be eliminated. In addition, the upper and lower surfaces 41 and 42 of the partition wall member 40 opposed to each other, the protruding end surface 78 of the central protrusion 68 and the upper end surface 122 of the rotating plate 120 are all orthogonal to the rotation center axis of the second orifice member 54. Since the partition wall member 40 is fixedly provided on the second mounting member 14 while being a flat surface, these non-contact states are more stably maintained.

  Furthermore, since both the N pole and the S pole are provided on the central protrusion 68 and the rotating plate 120, not only the magnetic attractive force between the different poles between the central protrusion 68 and the rotating plate 120 is obtained. When the same poles are opposed to each other, a magnetic repulsive force is applied. Thereby, the relative circumferential positioning of the central protrusion 68 and the rotating plate 120 can be performed more stably. In addition, since the second orifice member 54 and the rotating plate 120 are both integrally molded products of plastic magnets, it is not necessary to provide a separate permanent magnet, and the number of parts can be reduced. .

  Further, particularly in the present embodiment, by using a stepping motor as the electric motor 88, the effects of excellent positioning accuracy and easy position control can be exhibited, and the second orifice member can be obtained by simple control means. The relative rotation position of the first orifice member 52 relative to the first orifice member 52 and the passage length of the orifice passage 86 can be set with high accuracy.

  Next, FIG. 5 shows an engine mount 140 according to a fluid-filled vibration isolator as a second embodiment of the present invention. In the following description, portions or members that are substantially the same as those in the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted.

  The second orifice member 142 in the present embodiment includes an orifice member main body 144 and a rotated plate 146 as a driven portion. The orifice member main body 144 has substantially the same shape as the second orifice member 54 in the first embodiment, and the diameter of the central protrusion 68 of the second orifice member 54 is made smaller. The projecting dimension of the central projection 68 downward is made smaller. In particular, the orifice member main body 144 in the present embodiment is formed of a nonmagnetic metal material or a synthetic resin material.

  On the other hand, the rotated plate 146 has a substantially cylindrical block shape having a diameter dimension substantially equal to that of the rotating plate 120. The rotated plate 146 is an integrally molded product of a plastic magnet, and a magnetic pole is caused to appear on the lower end surface 148 of the central projection 68 in the first embodiment. Thus, in the present embodiment, the driven-side magnetic pole portion is formed by the lower end surface 148. The lower end surface 148 is a flat surface extending in a direction perpendicular to the axis of the rotated plate 146, in other words, perpendicular to the rotation center axis of the second orifice member 54. Further, a shaft insertion hole similar to the central protrusion 68 in the first embodiment is provided on the central axis of the rotated plate 146. The upper end surface of the rotated plate 146 is fixed to the lower end surface of the central projection 68 of the orifice member main body 144 on the same axis by bonding or the like, and the orifice member main body 144 and the rotated plate 146 are mutually attached. The second orifice member 142 is configured by being fixed.

  Similar to the first embodiment, the second orifice member 142 is assembled by the shaft member 80 so as to be rotatable relative to the first orifice member 52 around the shaft member 80. As a result, the lower end surface 148 of the rotated plate 146 is positioned opposite to the upper end surface 122 of the rotating plate 120 with the partition member 40 interposed therebetween, and a magnetic acting force is exerted between the lower end surface 148 and the upper end surface 122. Thus, the rotated plate 146 and the orifice member main body 144 fixed to the rotated plate 146, that is, the second orifice member 142 can be rotated according to the rotation amount of the rotating plate 120. As is clear from this embodiment, the entire second orifice member does not necessarily need to be formed of a magnetic material.

  Next, FIG. 6 shows an engine mount 160 according to a fluid-filled vibration isolator as a third embodiment of the present invention. The first orifice member 162 in this embodiment is formed by combining an outer orifice member 164 and an inner orifice member 166.

  The outer orifice member 164 has a substantially bottomed cylindrical shape having an opening recess 168 opened downward, and the diameter of the opening recess 168 is larger than that of the first orifice member 52. . On the outer peripheral surface of the outer orifice member 164, a circumferential groove 170 is formed which opens outward and extends with a predetermined length of about a half circumference in the circumferential direction. A communication hole 172 opened above the outer orifice member 164 is formed at one end portion in the circumferential direction of the circumferential groove 170, and an opening is formed below the outer orifice member 164 at the other end portion. A communication hole (not shown) is formed. Here, the communication hole 172 is opened inward from the outer peripheral wall portion of the outer orifice member 164. Further, the inner peripheral side wall portion of the circumferential groove 170 is continuously formed over substantially the entire circumferential groove 170 except for the communication window 174 formed at one end in the circumferential direction communicated with the communication hole 172. ing.

  On the other hand, the inner orifice member 166 has a substantially cylindrical shape, and its outer diameter is slightly smaller than the diameter of the opening recess 168 of the outer orifice member 164, and its inner diameter is the second. It is slightly larger than the outer diameter of the orifice member 54. A circumferential groove 60 formed in the first orifice member 52 in the first embodiment is formed on the outer peripheral surface of the inner orifice member 166, and one end in the circumferential direction of the circumferential groove 60 is formed. A communication hole 62 is formed in the portion, and a plurality of communication slits 64 are formed in the inner peripheral side wall portion.

  Then, the first orifice member 162 is formed by fixing the inner orifice member 166 in the opening concave portion 168 of the outer orifice member 164 by bonding or the like. Thus, the outward opening of the circumferential groove 60 of the inner orifice member 166 is covered with the inner circumferential surface of the outer circumferential wall portion of the outer orifice member 164. Further, a communication hole 62 formed at one end of the circumferential groove 60 is opened above the first orifice member 162 through the communication hole 172 of the outer orifice member 164. The circumferential groove 60 is communicated with the circumferential groove 170 through the communication window 174 at one end where the communication hole 62 is formed.

  A partition member 44 is formed by assembling the second orifice member 54 to the first orifice member 162 in the same manner as in the first embodiment, and the partition member 44 is assembled to the second mounting bracket 14. It is done. Thereby, the circumferential groove 170 of the outer orifice member 164 is covered with the seal rubber layer 32. As a result, in the present embodiment, the first orifice passage 176 that connects the pressure receiving chamber 48 and the equilibrium chamber 50 to each other is formed by the circumferential groove 60, and the pressure receiving chamber 48 and the equilibrium chamber 50 are mutually connected by the circumferential groove 170. A second orifice passage 178 communicating with the second orifice passage 178 is formed.

  The first orifice passage 176 is communicated with the pressure receiving chamber 48 through the communication hole 62 and the communication hole 172, and the equilibrium chamber 50 through the communication slit 64 and the communication window 72, as in the first embodiment. The circumferential length can be adjusted by adjusting the relative rotational position of the second orifice member 54 with respect to the first orifice member 166. The first orifice passage 176 is tuned so as to exhibit an effective anti-vibration effect against high-frequency vibration such as idling vibration.

  On the other hand, the second orifice passage 178 is communicated with the pressure receiving chamber 48 through the communication hole 172, and is communicated with the equilibrium chamber 50 through a communication hole (not shown), and the passage length is fixed. The second orifice passage 178 is tuned to exhibit an effective anti-vibration effect against low-frequency vibration such as engine shake.

  According to the engine mount 160 in the present embodiment, when low-frequency vibration such as engine shake is input, an effective vibration-proofing effect is exhibited based on the fluid action of the fluid flowing through the second orifice passage 178. . On the other hand, when high-frequency vibration such as idling vibration is input, an effective vibration-proofing effect is exhibited based on the fluid action of the fluid flowing through the first orifice passage 176. When the frequency of the input vibration changes, for example, when the engine is started or when the air conditioner is turned on / off, the first orifice passage 176 is changed by changing the length of the first orifice passage 176. The resonance frequency in liquid can be made to follow the change of the input vibration frequency. Thereby, an effective anti-vibration effect can be exhibited over a wider frequency range.

  Note that the tuning frequencies of the first orifice passage 176 and the second orifice passage 178 can be appropriately set in consideration of the required vibration isolating performance and the like. For example, the tuning frequency of the first orifice passage 176 is set to the first tuning frequency. It is of course possible to tune to a lower frequency range than the second orifice passage 178.

  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, as shown in FIG. 7, the second orifice member 54 and the rotating plate 120 in the first embodiment are formed from nonmagnetic members, and magnetic poles are developed on the protruding end surface 78 and the upper end surface 122, respectively. For example, a permanent magnet 180 may be provided. In this way, the driving-side magnetic pole portion is formed by the permanent magnet 180 provided on the rotating plate 120 and the driven-side magnetic pole portion is formed by the permanent magnet 180 provided on the second orifice member 54. .

  Further, in each of the above embodiments, the magnetic poles of the second orifice member 54 and the rotating plate 120 are positioned so as to be rotationally symmetrical so as to be in the same position by half-circular rotation (see FIG. 3). In addition, the magnetic poles may be arranged in a non-rotationally symmetric manner as schematically shown by way of example of the protruding end surface 78 of the second orifice member 54. In this way, the relative position in the circumferential direction between the second orifice member 54 and the rotating plate 120 is uniquely determined, and the possibility that the relative position in the circumferential direction may deviate from the intended position can be further reduced. I can do it.

  Furthermore, in each of the above embodiments, the partition wall portion is formed by the partition wall member 40 formed separately from the diaphragm 36, but the partition wall portion is formed by, for example, forming the central portion of the diaphragm 36 thick. You may integrally form with a flexible film | membrane. In this way, the number of parts can be reduced, and the number of assembly steps can be reduced.

  In addition, the partition wall portion does not necessarily need to be fixedly provided on the second attachment member, but for example, by providing the partition portion fixedly on the first orifice member, the second attachment member is interposed via the first orifice member. For example, it may be fixedly provided.

  Furthermore, as shown in FIG. 9, the upper and lower surfaces 41, 42 of the partition wall member 40, the protruding end surface 78 of the second orifice member 54 and the upper end surface 122 of the rotating plate 120 are in contact with each other. It may be superposed. In this way, the rotational driving force of the electric motor 88 can be stably transmitted by the second orifice member 54 via the rotary plate 120.

The longitudinal cross-sectional view which shows the engine mount as 1st embodiment of this invention. The principal part expanded sectional view of the engine mount. Explanatory drawing for demonstrating the driven side magnetic pole part of the same engine mount. It is explanatory drawing for demonstrating the rotation position of a 2nd orifice member, Comprising: Explanatory drawing equivalent to the IV-IV cross section in FIG. The longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention. The longitudinal cross-sectional view which shows the engine mount as 3rd embodiment of this invention. The principal part expanded sectional view for demonstrating the different aspect of this invention. Explanatory drawing for demonstrating the different aspect of the to-be-driven side magnetic pole part of this invention. The principal part expanded sectional view for demonstrating the further different aspect of this invention.

Explanation of symbols

10: engine mount, 12: first mounting bracket, 14: second mounting bracket, 16: rubber elastic body of main body, 36: diaphragm, 40: partition member, 44: fluid chamber, 46: partition member, 48: pressure receiving pressure 50: Equilibrium chamber, 52: First orifice member, 54: Second orifice member, 64: Communication slit, 68: Central protrusion, 78: Projection end face, 72: Communication window, 86: Orifice passage, 88: Electric motor, 120: Rotating plate, 122: Upper end surface

Claims (8)

A pressure receiving chamber in which the first mounting member and the second mounting member are connected by a main rubber elastic body, and a part of the wall is configured by the main rubber elastic body to cause pressure fluctuations when vibration is input; A part of the wall is formed by a flexible membrane and an equilibrium chamber in which volume change is allowed is provided. Incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber, and the pressure receiving chamber and the equilibrium chamber are connected. In a fluid-filled vibration isolator having an orifice passage that allows fluid flow at least,
A combined portion of the first orifice member and the second orifice member by combining the second orifice member so as to be relatively rotatable about one axis with respect to the first orifice member supported by the second mounting member. A circumferential passage is formed so as to extend in a relative rotation direction in the first passage hole communicated with one of the pressure receiving chamber and the equilibrium chamber at one circumferential end of the circumferential passage, The orifice passage is formed by forming the pressure receiving chamber and the second communication hole communicated with the other of the equilibrium chambers at the other circumferential end of the circumferential passage, and the first orifice member The second orifice member is rotated relative to the first passage hole to change the circumferential separation distance between the first passage hole and the second passage hole on the circumferential passage. Through While the length is variable, a driven portion is provided on the second orifice member, and a driven-side magnetic pole portion is formed on the driven portion around the rotation center axis of the second orifice member. In addition, a partition wall made of a non-magnetic material is provided on the wall of the equilibrium chamber, a drive unit is disposed at an outdoor position facing the driven unit across the partition wall, and the drive unit is mounted on the driven unit. An actuator for rotationally driving on the same central axis as the drive unit is provided, and a drive side magnetic pole part is formed on the circumference of the surface of the drive unit facing the driven part around the rotation center axis. The second orifice with respect to the first orifice member by transmitting the rotational driving force of the actuator from the driving portion to the driven portion by using a magnetic force acting between the driving portion and the driven-side magnetic pole portion. By changing the relative rotational position of the member, Fluid filled type vibration damping device, characterized in that the passage length was adjustable for.   The fluid filled type vibration damping device according to claim 1, wherein the partition wall portion is formed of a hard material and is fixedly assembled to the second mounting member.   Both the inner and outer surfaces of the partition wall, the driven portion superimposed on the inner surface of the partition wall, and the opposing surfaces of the drive unit superimposed on the outer surface of the partition wall are both the second orifice member. The fluid-filled vibration damping device according to claim 1, wherein the fluid-filled vibration damping device is formed with a flat surface orthogonal to the rotation center axis of the first and second rotation shafts.   The inner and outer surfaces of the partition wall, the driven portion superimposed on the inner surface of the partition wall, and the opposing surfaces of the drive unit superimposed on the outer surface of the partition wall are overlapped with a gap, respectively. Item 4. The fluid-filled vibration isolator according to any one of Items 1 to 3.   The driving unit and the driven unit are provided with at least one N pole and S pole at each corresponding position on the circumference as the driving side magnetic pole unit and the driven side magnetic pole unit on each facing surface. The fluid-filled vibration isolator according to any one of claims 1 to 4.   The driving part and the driven part are formed of a plastic magnet, and the driving side magnetic pole part and the driven side magnetic pole part are formed integrally with the driving part and the driven part, respectively. The fluid-filled vibration isolator according to any one of 1 to 5.   A rotation support shaft extending on a relative rotation center axis of the first orifice member and the second orifice member is provided, and the rotation support shaft is rotated with respect to one of the first orifice member and the second orifice member. 7. The moving support shaft is fixed, and the rotation support shaft is rotatably inserted into the other of the first orifice member and the second orifice member. The fluid-filled vibration isolator as described.   The second mounting member has a cylindrical portion, and the first mounting member and the second mounting member are separated from each other on one opening side of the cylindrical portion. Are connected by the rubber elastic body so that one opening of the cylindrical portion is fluid-tightly closed, and the other opening of the cylindrical portion is flexible as the flexible film. The main rubber elastic body and the flexible rubber are separated by a partition member that is fluid-tightly closed with a conductive rubber film and supported by the cylindrical portion and spread in the direction perpendicular to the axis of the cylindrical portion. The pressure-receiving chamber is formed between the partition member and the main rubber elastic body by partitioning a surface facing the membrane, and the equilibrium chamber is provided between the partition member and the flexible rubber membrane. And the first orifice member is constituted by a portion of the partition member fixed to the tubular portion. In addition, the second orifice member is assembled to the first orifice member so as to be relatively rotatable around the central axis of the cylindrical portion, and the partition wall is formed in the central portion of the flexible rubber film. And the partition wall is positioned opposite to the second orifice member in the direction of the central axis of the cylindrical portion and is opposite to the equilibrium chamber with the partition wall interposed therebetween. The actuator is arranged on the side, the partition wall is fixed to the housing of the actuator, and the housing of the actuator is fixedly supported by a second mounting member. The fluid-filled vibration isolator according to any one of the above.

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