JP2005155900A - Active liquid sealed vibration absorbing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an active liquid sealed vibration absorbing device having simplified construction with its increased output and contributing to a smaller size with a less number of parts. <P>SOLUTION: The vibration absorbing device comprises a first mounting tool 1 and a second mounting tool 3 connected to each other via a vibration absorbing base 3, a rubber wall 5 provided on the second mounting tool 2 to form a first liquid chamber 4, a diaphragm 7 forming a second liquid chamber 6 as part of a chamber wall, the first liquid chamber 4 and the second liquid chamber 6 being communicated with each other via an orifice 8, and an iron core movable type actuator 9 constructed as part of a needle 30 which can reciprocate a shaft member 27 connected to the rubber wall 5 in the axial direction in relation to a stator 28. A coil 33 of the stator 28 is excited for driving the shaft member 27 in both outward and homeward strokes to vibrate the rubber wall 5, whereby pressure in the first liquid chamber 4 is controlled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an active liquid-filled vibration isolator of the type that enhances the vibration isolating effect by controlling the pressure of an internal liquid chamber.

  An active liquid-filled vibration isolator is generally attached to a first fixture, a cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material that connects them, and a second fixture. A first diaphragm that forms a liquid sealing chamber between the vibration isolating substrate, a partition that partitions the liquid sealing chamber into a first liquid chamber on the vibration isolating substrate side and a second liquid chamber on the first diaphragm side; An orifice for communicating the liquid chamber and the second liquid chamber, a rubber wall forming a part of the chamber wall of the first liquid chamber, and an electromagnet for controlling the pressure of the first liquid chamber by driving the rubber wall to vibrate And an actuator of the type.

  For example, it is assembled as an engine mount in an automobile, and by controlling the pressure of the first liquid chamber via an actuator, an excellent vibration suppressing effect is obtained, for example, by reducing the dynamic spring of the mount.

Conventionally, in the above active liquid-filled vibration isolator, as disclosed in the following Patent Document 1 and Patent Document 2, an orifice is provided between the outer peripheral portion of the partition and the inner peripheral surface of the second fixture. And inserting a shaft member as a mover of an actuator serving as a vibration means into a recess formed in the center of the partition, and extending the rubber wall between the inner peripheral portion of the recess and the tip of the shaft member. The diaphragm is vulcanized and molded, and the diaphragm is vulcanized and molded over the inner peripheral portion of the second fixture and a part of the shaft member, and the rubber wall is provided so as to be vibrated through the shaft member of the actuator.
JP 2001-304329 A JP 2002-195342 A

  According to the above conventional configuration, the shaft member of the actuator is inserted into the recess formed in the center of the partition, and the rubber wall is vulcanized and formed between the inner peripheral portion of the recess and the tip of the shaft member. Since the diaphragm is vulcanized and formed over the inner peripheral portion of the fixture and a part of the shaft member, the number of parts around the rubber wall and the shaft member is increased and the structure is complicated.

  Furthermore, as a driving method of an electromagnet actuator, as in Patent Document 1, a shaft member having two coils arranged coaxially with a space in the vertical direction and having a magnet installed in its air core is inserted and arranged. In the case of a so-called moving magnet type in which a shaft member with a magnet is reciprocated in the axial direction by electromagnetic force generated between the coil and the magnet by energizing the coil, the outer diameter is large in order to obtain a large force. Therefore, there is a problem that it is not suitable for miniaturization and weight reduction, and that if the magnet is enlarged, it is not cheap and weak against shock.

  Further, as in Patent Document 2, a yoke member and a coil are arranged in the inner part, and the outer part surrounding the yoke part is used as a vibration member that reciprocates in the axial direction, and the outer part is connected to the rubber wall and applied. When configured to vibrate, the outer part is separated from the wall surface of the holding bracket and is supported only by the shaft center part, and the support-like body becomes unstable. Need to be larger.

  An object of the present invention is to provide an active liquid-filled vibration proofing that can simplify the structure, reduce the number of parts, simplify assembly work, increase output, and contribute to downsizing. The point is to provide a device.

  In the present invention, the first fixture disposed in the device shaft center portion and the cylindrical second fixture disposed on the outside thereof are connected via a vibration-proof base made of a rubber-like elastic material, A rubber wall is provided in the second fixture so as to face the vibration isolator base and the first fixture, and a first liquid chamber is formed between the vibration isolator base and the rubber wall. In addition to the liquid chamber, a second liquid chamber in which a diaphragm forms a part of the chamber wall is provided, and the first liquid chamber and the second liquid chamber are communicated by an orifice, and the chamber wall of the first liquid chamber An active liquid enclosure is configured such that vibration means is connected to the rubber wall forming a part of the rubber wall from above, and the rubber wall is vibrated by the vibration means to control the pressure of the first liquid chamber. A vibration isolator having an orifice forming member vulcanized and bonded to the outer peripheral portion of the rubber wall, the orifice forming member being (2) The orifice is formed by being fitted and fixed to the inner periphery of the fixture, and a cup-shaped holding member that holds the vibration means is fitted and fixed to the upper inner periphery of the second fixture. In addition, the bottom portion of the holding member is brought into contact with an annular protrusion made of an upward rubber portion on the inner peripheral portion of the orifice forming member, and the upper cylindrical metal fitting, the annular protrusion, and the upper portion above the orifice forming member, A portion between the holding member and the holding member is formed as a second liquid chamber, and a part of the second fixture constituting the outer peripheral wall of the second liquid chamber is formed by a diaphragm. It has a shaft member connected to the central portion, and the shaft member is composed of an iron core movable actuator configured as at least a part of a mover that can reciprocate in the axial direction with respect to a stator disposed on the outside thereof. Said solid By coil provided to the child is energized, the shaft member is characterized by comprising configured to vibrate the rubber wall is driven in both directions of the forward stroke and backward stroke.

  According to the present invention, with the above-described configuration, it is possible to eliminate the delay in the rise of the force generated by the reciprocating motion of the shaft member of the actuator as the vibration means, and the pressure control of the first liquid chamber can be performed smoothly and quickly. In addition, an increase in the number of parts can be suppressed. Moreover, since the iron core is movable, a large output can be obtained without increasing the outer diameter.

  For example, in a structure in which the actuator is configured as a solenoid type, the shaft member of the actuator connected to the rubber wall is electrically driven in the forward stroke, and the backward stroke is mechanically restored by the elastic force of the coil spring. Since it is necessary to resist the elastic force of the coil spring at the beginning of the stroke, as shown in FIG. 8, the rising of the force F [N] acting on the vibration isolator by driving the actuator is t1 [s (seconds). In addition to delay, the value of this delay t1 is likely to vary for each forward travel stroke. In the backward stroke, there is a problem that the force F rapidly decreases and the Ft curve (curve representing the relationship between F and time t) is not smooth, and vibration cannot be accurately absorbed. In order to solve this problem, a filter member for forming a third liquid chamber between the first liquid chamber and the rubber wall is provided, and means for correcting the Ft curve to a sine wave curve is adopted. However, this increases the number of parts by the amount of the filter member.

  On the other hand, according to the above configuration of the present invention, the shaft member of the actuator connected to the rubber wall is used as at least a part of the mover, and an electric current is passed through the coil provided in the stator disposed on the outer side of the mover. Since both the forward and backward strokes are electrically driven by exciting the coil, the delay of the rising of the force F can be eliminated as shown in FIG. As an example, when a sine wave alternating current is passed through the coil, the Ft curve can be made into a sine wave curve corresponding to a sine wave curve representing the current-time relationship of the sine wave alternating current. Therefore, it is not necessary to provide the third liquid chamber as a correction means for making the Ft curve a sine wave curve, and the filter member becomes unnecessary, and the increase in the number of parts can be suppressed.

  And in this invention, the said rubber wall which comprises a part of chamber wall of a said 1st liquid chamber is supported by the orifice formation member by which the outer periphery was vulcanized-bonded, and the holding member holding an excitation means Since the second liquid chamber is formed by being fitted to the inner periphery of the second fixture and the bottom thereof being brought into contact with the annular rubber wall on the inner periphery of the orifice forming member, The second liquid chamber can be configured using the holding member of the vibration means, and can be configured easily and compactly with a reduced number of parts, and the orifice communicates the first liquid chamber and the second liquid chamber. The structure can be simplified, the space can be reduced, and the assembly is facilitated.

  In particular, the second fixture comprises a lower cylindrical fitting to which a vibration isolating base is connected and an upper cylindrical fitting that is caulked and fixed to the upper end thereof, and a rubber layer for sealing is provided on the inner periphery of the upper cylindrical fitting. The orifice forming member is hermetically fitted to the inner periphery of the lower cylindrical fitting through the sealing rubber layer at a position where the orifice forming member abuts on the upper end portion of the lower cylindrical fitting. It is preferable to be worn.

  A flange portion is formed to protrude from the upper end portion of the upper cylindrical metal fitting, and the flange portion provided at the upper end portion of the holding member fitted to the upper cylindrical metal fitting is connected to the flange portion of the upper cylindrical metal fitting by screw fastening means. When fixed, the holding member that holds the vibration means can be held firmly and stably with respect to the second fixture.

  An actuator as a vibration means is fitted and held on the holding member, and has a cap member that covers an upper portion thereof, and a flange portion that is formed to project on the outer periphery of the holding member together with the flange portion of the holding member. In the case where the upper cylindrical fitting is fixed to the flange portion by screw fastening means, the vibration means can be stably and reliably held.

  The actuator includes a magnetic pole portion in which the stator disposed outward of the mover including the shaft member protrudes radially inward, and the magnetic pole portion is adjacent to the axial direction. At least a pair of permanent magnets having different polarities are arranged, and a coil is wound around the magnetic pole portion, and a combination of a magnetomotive force generated by the coil excitation and a magnetomotive force of each permanent magnet Thus, the shaft member is configured to reciprocate.

  Specifically, the actuator includes a mover in which a magnetic material portion is provided on the outer periphery of the shaft member, and an annular stator disposed on the outer side of the mover. The mover is supported so as to be capable of reciprocating in the axial direction in the inner space of the stator, and the stator is reciprocated by the magnetic pole portion facing the magnetic material portion of the mover. A pair of permanent magnets facing the magnetic material portion in a state of being adjacent to each other in the moving direction are disposed with the arrangement of magnetic poles in the direction orthogonal to the reciprocating direction reversed so as to be different from each other. A coil capable of generating a magnetic flux passing through the permanent magnet is wound around the magnetic pole portion.

  As a result, when a positive current (positive current) flows through the coil, the direction of the magnetomotive force of one of the permanent magnets having a different polarity is the same as the direction of the magnetomotive force of the coil, so That is, the magnetic fluxes are combined, the direction of the magnetomotive force of the other permanent magnet is opposite to the direction of the magnetomotive force of the coil, and the magnetic force of both magnetomotive forces is reduced. Thereby, a force in one axial direction acts on the magnetic material portion and the shaft member in the mover, and the shaft member moves to the one axial side. When a reverse current (negative current) flows through the coil, the direction of the magnetomotive force of the one permanent magnet is opposite to the direction of the magnetomotive force of the coil, and the direction of the magnetomotive force of the other permanent magnet And the direction of the magnetomotive force of the coil is the same. Thereby, the force toward the other axial direction acts on the magnetic material portion and the shaft member in the mover, and the shaft member moves to the other side in the axial direction.

  That is, the force acting in the axial direction is generated in forward and reverse directions according to the direction of current (positive current and negative current) exciting the coil. Accordingly, the shaft member can be reciprocated in the axial direction by alternately changing the direction of the coil current in the forward and reverse directions, that is, by changing the positive and negative current.

  Also, it is an iron core movable type actuator that uses the change of the magnetic circuit due to the combination of the magnetomotive force due to coil excitation and the magnetomotive force of each permanent magnet that has a different polarity, than in the moving magnet type. A large output can be obtained.

  In particular, the pair of permanent magnets adjacent to each other in the reciprocating direction and having different polarities are opposed to each other with the magnetic material portion sandwiched in a direction orthogonal to the reciprocating direction, and the opposing magnetic poles have different polarities. If the arrangement of the magnetic poles is reversed and the magnetic pole portions of the stator are opposed to each other with the mover interposed therebetween, a stronger magnetomotive force can be generated. Thereby, a large force can be obtained as compared with the moving magnet type, and the size can be easily reduced.

  According to the present invention, the second liquid chamber can be set inside the second fixture with the rubber wall forming the chamber wall of the first liquid chamber interposed therebetween, and the orifice that allows the first liquid chamber and the second liquid chamber to communicate with each other. The active liquid-filled vibration isolator can simplify the assembly structure, simplify the assembly structure, reduce the number of parts, reduce space, and increase the output of the actuator while reducing the size. Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show an active liquid-filled vibration isolator (hereinafter referred to as “liquid-filled vibration isolator”) that is assembled in an automobile as an engine mount.

  This liquid-filled vibration isolator is disposed on the lower side of the device shaft center part and is attached to the engine side member on the lower end side, and surrounds the first attachment tool on the outer side. And a cylindrical second fixture 2 that is arranged and attached to a frame or the like on the vehicle body side. As shown in the figure, the first fixture 1 and the second fixture 2 are fixed in a sealed state between the first fixture 1 and the lower portion of the second fixture 1 by a vulcanizing adhesive means. A rubber wall 5 is provided in the second fixture 2 so as to be opposed to the upper side of the antivibration substrate 3 and the first fixture 1. The first liquid chamber 4 is formed between the anti-vibration base 3 and the rubber wall 5. In addition to the first liquid chamber 4, there is provided a second liquid chamber 6 in which a later-described diaphragm 13 forms a part of the chamber wall, and is connected to the first liquid chamber 4 by an orifice 7.

  The rubber wall 5 forming a part of the chamber wall of the first liquid chamber 4 is provided with an iron core movable type electromagnet type linear actuator 9 (hereinafter referred to as “actuator 9”) as a vibration means. It is connected from the opposite side to the first liquid chamber 4 and is provided so as to control the pressure of the first liquid chamber 4 by oscillating and displacing the rubber wall 5. The actuator 9 is fixedly held on the upper part of the second fixture 2 as will be described later.

  The first fixture 1 has a tapered shape in which the upper end portion 1a projects slightly outward and gradually decreases in diameter toward the lower end side, and the vibration-proof base 3 is vulcanized and bonded to the outer periphery thereof. The first fixture 1 has a screw hole 1b that opens downward in the axial center thereof, and a member (not shown) on the engine side by a mounting bolt (not shown) screwed into the screw hole 1b. Can be attached and fixed.

  The second fixture 2 includes a lower cylindrical fitting 21 to which the vibration isolating base 3 is connected, and an upper cylindrical fitting 22 that is connected to the upper end portion thereof by caulking and fixing means and extends upward. For example, as shown in the figure, the lower end portion 22a projecting outward from the upper tubular fitting 22 is bent, crimped, fixed and connected so as to wrap the flange portion at the upper end portion of the lower tubular fitting 21. The first fixture 1 is disposed inward of the lower tubular fitting 21 and protrudes downward. In the second fixture 2, the first liquid chamber 4, the second liquid chamber 6, the orifice 7, and the like are built in as described later, and an actuator 9 serving as a vibration means is held.

  The lower tubular fitting 21 has a substantially cup shape with an open bottom, and a tubular fitting 23 in which the anti-vibration base 3 is vulcanized and bonded to an inner periphery of the lower portion, and a substantially cup shape with an open bottom. It consists of a holding cylinder 24 for attachment that holds the cylindrical fitting 23. The cylindrical fitting 23 is press-fitted into the inner periphery of the holding cylinder 24, the upper end flange portion 23 a of the cylindrical fitting 23 is in contact with the upper end flange portion 24 a of the holding cylinder 24, and the cylindrical fitting 23 is The lower end portion is fixed in a state where it abuts against the bottom portion 24 b of the holding cylinder 24. Therefore, the lower end portion 22a of the upper tubular fitting 22 is fixed by caulking so as to wrap around both the flange portions 23a and 24a which are also the flange portions of the lower tubular fitting 21. The holding cylinder 24 is provided so that, for example, a support side member 20 such as a frame on the vehicle body side is connected and fixed to the outer periphery thereof.

  The anti-vibration base 3 has a truncated cone shape with the bottom surface recessed as shown in the figure, and the upper side of the first fixture 1 is vulcanized and bonded to the center thereof, and the outer peripheral portion is the first one. 2 It is vulcanized and bonded to the inner periphery of the lower part of the cylindrical fitting 23 in the fixture 2. A lower end portion of the first fixture 1 protrudes downward from the vibration isolation base 3. A rubber layer 3a integral with the vibration isolating base 3 is provided on the inner periphery of the cylindrical metal fitting 23, and the rubber layer 3a is continuously formed up to the flange portion 23a.

  An annular orifice forming member 10 having a substantially C-shaped cross section having a circumferential groove opened radially outward is vulcanized and bonded to the outer peripheral portion of the rubber wall 5. An annular protrusion 11 made of a rubber portion protruding upward from the rubber wall 5 is provided on the inner peripheral portion of the orifice forming member 10 over the entire periphery. The annular protrusion 11 is reinforced by embedding a protruding piece 10 a extending from the inner peripheral portion of the orifice forming member 10 in the rubber portion. Further, a head portion 27a on the lower end side of the shaft member 27 of the actuator 9 as a vibration means described later, in particular, is projected outward in a circular shape and a peripheral edge portion thereof is bent downward at the central portion of the rubber wall 5. The head 27a is connected. In the case of the figure, the rubber wall 5 has an annular shape with a notch at the center, and the peripheral edge of the head portion 27a is embedded in the inner periphery of the rubber wall 5 by vulcanization molding means so that the rubber wall 5 is connected and fixed in a sealed state. Has been.

  The orifice forming member 10 is liquid-tightly fitted and fixed to the inner periphery of the lower part of the upper cylindrical fitting 22 and is integrally assembled. In the case of the figure, the sealing rubber layer 12 is provided on the inner periphery of the upper cylindrical fitting 22, and the orifice forming member 10 is located on the inner periphery of the upper cylindrical fitting 22 at a lower position where it abuts on the upper end of the lower cylindrical fitting 21. The rubber layer 12 is fitted and fixed in a liquid-tight manner. As a result, the rubber wall 5 is held at a fixed position, and a space between the rubber wall 5 and the vibration isolating base 3 and the first fixture 1 is formed as a first liquid chamber 4.

  Further, a cup-shaped holding member 15 for holding an actuator 9 serving as a vibration means is provided through the sealing rubber layer 12 on the inner periphery of the upper cylindrical member 22 above the orifice forming member 10. It is fixed in a liquid-tight manner. In the case of the figure, the upper portion 22b of the upper tubular fitting 22 is formed to be slightly smaller in diameter than the lower portion, the holding member 15 is fitted to the inner periphery of the upper portion 22b from above, and the bottom portion 15a of the holding member 15 is A liquid-tight contact is made with the upper end surface of the upward annular protrusion 11 on the inner peripheral portion of the orifice forming member 10 so as to maintain a sealed state.

  By being assembled in this way, the portion between the portion of the second fixture 2 (upper cylindrical fitting 22) above the orifice forming member 10 and the annular protrusion 11 and the holding member 15 is the second liquid chamber 6. In addition, a concave groove portion of the orifice forming member 10 is formed as an orifice 7 extending in the circumferential direction, and the first liquid chamber 4 and the second liquid chamber 6 are connected in communication. Reference numerals 7a and 7b denote communication portions with the first liquid chamber 4 and the second liquid chamber 6, respectively. The liquid chambers 4 and 6 and the orifice 7 are filled with liquid.

  A window portion 22d in which a part of the upper cylindrical fitting 22 is cut away at one or a plurality of positions of the upper cylindrical fitting 22 constituting the second liquid chamber 6, preferably at two to four locations in the circumferential direction. And a diaphragm 13 made of a rubber film integral with the sealing rubber layer 12 is provided so as to close the notch window portion 22d. The diaphragm 13 constitutes a part of the chamber wall of the second liquid chamber 6 so that the volume of the second liquid chamber 6 is variable.

  Further, an upper end portion of the upper cylindrical metal fitting 22 has an overhang-formed flange portion 22c, and the flange portion 15b at the upper end portion of the holding member 15 fitted to the upper cylindrical metal fitting 22 has the upper cylindrical metal fitting. 22 is fixed to the flange portion 22c by a screw fastening means 14 such as a bolt or a nut, so that the fitted state and the contact state with the annular projection 11 can be held without looseness. The upper tubular fitting 22 is connected and fixed to the lower tubular fitting 21 in liquid in a state where the holding member 15 is fastened and the orifice forming member 10 is fitted as described above.

  The actuator 9 as the vibration means is fitted to the holding member 15 by press-fitting means or the like, and an upper portion thereof is covered with a cap member 40, and a flange portion 40 a is formed to project from the outer peripheral portion of the cap member 40. Further, the holding member 15 is stably held by being fixed to the flange portion 22c of the upper tubular fitting 22 together with the flange portion 15b of the holding member 15 by the screw fastening means 14. Reference numeral 41 denotes a support member for the actuator 9, which is placed on the bottom portion 15 a of the holding member 15.

  The iron-movable electromagnet actuator 9 serving as the vibration means for the rubber wall 5 has a shaft member 27 that constitutes at least a part of a mover that can reciprocate in the axial direction with respect to the stator 28. The shaft member 27 is set in a vertical posture, and the shaft member 27 is connected to the central portion of the rubber wall 5 as described above. Thus, the actuator 9 is configured to electrically drive the mover, that is, the shaft member 27 in both forward and backward strokes, by exciting a coil provided in the stator 28 as will be described later. ing. Next, the structure and operation of the actuator 9 will be described in detail.

  The actuator 9 includes a stator 28 held by the holding member 15 and a mover 30 supported in an inner space (axial center portion) of the stator 28 so as to reciprocate in the axial direction with respect to the stator 28. It has.

  The stator 28 is located outside the mover 30 and has a yoke 28a formed by laminating a large number of annular (mainly rectangular annular) metal plates made of a magnetic metal such as an electromagnetic steel plate, and a shaft of the yoke 28a. Magnetic pole portions 29, 29 projecting radially inward from both sides so as to face each other with the mover 30 in between in the central portion in the center direction.

  The mover 30 basically has a magnetic core as a mover core formed by laminating a number of metal disks made of the same magnetic metal at the center in the axial direction with the shaft member 27 at the center. The material part 30a is fixed, and the shaft member 27 is supported by the stator 28 through a pair of upper and lower leaf springs 35, 35 so as to be able to reciprocate in the vertical direction (axial direction of the shaft member 27).

  In the illustrated embodiment, the magnetic material portion 30a is fixed to a pipe member 37 fitted to the shaft member 27, and the pipe member 37 is fitted and fixed to the outer periphery of the shaft member 27. . As the fixing means, in the case shown in the figure, the shaft member 27 is a screw shaft having a screw over almost the entire length, and a positioning nut 36 is screwed to the shaft member 27 to a predetermined position on the upper side. A pair of upper and lower plate springs 35 and 35 for support, which will be described later, and a pair of short pipes 38 and 38 for sandwiching the pipe member 37 between the upper and lower plate springs 35 and 35, are described below. The pipe member 37 and the like are fixed between the nuts 36 and 39 by fitting and tightening the nut 39 for tightening onto the end of the shaft member 27.

  The pair of leaf springs 35, 35 are formed in a rectangular deformed ring shape that is partially constricted inward so as to bypass a coil portion described later, and have a gap above and below the magnetic material portion 30a. Is located. Each leaf spring 35 has an inner peripheral end sandwiched between the pipe member 37 and the short pipes 38 and 38 as described above, and an outer peripheral end thereof is an upper portion of the outer peripheral portion of the stator 28. The cap member 40 and the lower receiving member 41 are fixed to a fastening portion by a bolt 42 that is fastened and fixed with the yoke 28a interposed therebetween, and are supported so as to be elastically deformable. The stator 28 is fitted and held on the inner periphery of the holding member 15. Openings 40b and 41a through which the positioning nut 36 and the tightening nut 39 can pass are provided at the center of the cap member 40 and the receiving member 41, and the nut 15 is also provided at the center of the bottom 15a. An opening 17 through which 39 can pass is formed.

  Normally, only the shaft member 27 of the mover 30 is connected to a rubber wall until the lower cylindrical fitting 21 and the upper cylindrical fitting 22 of the second fixture 2 are assembled. The plate springs 35, 35 and the magnetic material portion 30 a are fitted and fixed to the member 27, and the stator 28 is fitted to the holding member 15 for assembly.

  As shown also in FIGS. 3 to 6, the reciprocating direction of the mover 30 (the inner end of the magnetic pole part 29, 29 of the stator 28 facing the magnetic material part 30 a of the mover 30) The permanent magnets 31 and 32 forming a pair of upper and lower circular arc plates facing each other in the state of being adjacent to each other in the vertical direction) so that their magnetic poles have NS different polarities. The magnetic poles are arranged in a direction (left-right direction) orthogonal to the reciprocating direction, and the arrangement of the magnetic poles (N pole and S pole) is reversed. Note that the length from the upper end of the upper permanent magnet 31 to the lower end of the lower permanent magnet 32 is longer than the length of the magnetic material portion 30a in the vertical direction (axial direction).

  A coil 33 is wound around an axis in a direction (left-right direction) orthogonal to the reciprocating direction at the magnetic pole portion 29 of the stator 28 to generate a magnetic flux passing through the pair of permanent magnets 31 and 32. It is configured to be possible.

  In the case of the figure, a magnet portion 34 composed of the pair of permanent magnets 31 and 32 is provided at inner end portions of two magnetic pole portions 29 and 29 of the stator 28 facing each other with the mover 30 interposed therebetween. The permanent magnets 31 and 32 of the magnet portions 34 and 34 of the magnetic pole portions 29 and 29 are opposed to each other with the magnetic material portion 30a interposed therebetween in a direction orthogonal to the reciprocating direction, and the opposing magnetic poles are different from each other. The arrangement of the magnetic poles is reversed from left to right so as to form a pole. Correspondingly, the coils 33 are also wound around the magnetic pole portions 29 and 29 in a state where the coils 33 are positioned on the left and right outer sides of the respective magnet portions 34. A spool member 43 holds the coil 33.

  As shown in FIGS. 3 and 5, the pair of coils 33 and 33 are connected to each other. As shown in FIGS. 3 and 4, the upper permanent magnet 31 of the pair of upper and lower permanent magnets 31 and 32 on the right side has an N pole on the side facing the magnetic material portion 30a and an S pole on the opposite side. The side permanent magnet 32 has an S pole on the side facing the magnetic material portion 30a and an N pole on the opposite side. Of the pair of left permanent magnets 31, 32, the upper permanent magnet 31 has an S pole on the surface facing the magnetic material portion 30a and an N pole on the opposite side, and the lower permanent magnet 32 has a magnetic material portion 30a. The opposite side is the N pole and the opposite side is the S pole. In FIGS. 3 and 4, the white arrow pointing in the horizontal direction represents the direction of the magnetomotive force of the permanent magnets 31 and 32. The magnetomotive force is directed to the left side at the upper side and to the right side at the lower side.

  With the above structure, as shown in FIG. 4, when a positive current flows through the coil 33, the direction of the magnetomotive force of the upper permanent magnet 31 and the direction of the magnetomotive force of the coil 33 (arrows in FIG. 4) The magnetic fluxes of the magnets are combined to increase the magnetomotive force. On the other hand, the direction of the magnetomotive force of the lower permanent magnet 32 and the direction of the magnetomotive force of the coil 33 are opposite to each other. Is offset and weakens. As a result, an upward force (indicated by a white arrow) acts on the magnetic material portion 30a and the shaft member 27 of the mover 30, and the shaft member 27 rises.

  Further, as shown in FIG. 6, when a current (negative current) in the reverse direction flows through the coil 33, the direction of the magnetomotive force of the upper permanent magnet 31 and the direction of the magnetomotive force of the coil 33 are reversed. The magnetic flux is canceled and the magnetomotive force is weakened, and the direction of the magnetomotive force of the lower permanent magnet 32 and the direction of the magnetomotive force of the coil 33 are the same. Combined to increase magnetomotive force. Thereby, a downward force (indicated by a white arrow) acts on the magnetic material portion 30a and the shaft member 27 of the mover 30, and the shaft member 27 is lowered. Then, the direction of the current of the coil 33 alternately changes forward and reverse, whereby the shaft member 27 reciprocates up and down.

  Since the actuator 9 is electrically driven in both the forward stroke and the backward stroke as described above, by passing a sine wave alternating current through the coil 33, the shaft member 27 of the movable element 30 is made to have an alternating current. It can be reciprocated up and down corresponding to the change in direction. In particular, the combination of the direction of the magnetomotive force of each of the pair of permanent magnets 31 and 32 having different polarities and the magnetomotive force generated in the coil 33 is a relatively compact device, but more than a moving magnet type. Since a large output is obtained, the shaft member 27 can be reliably reciprocated with a strong force, and the pressure control of the first liquid chamber 4 can be reliably performed.

  The present invention is not limited to an engine mount, and can be used in various ways. For example, the present invention can also be applied to a mount provided between a suspension member and a vehicle body side frame.

  Further, the magnet part 34 may be configured as in the following [A].

[A] Of the pair of upper and lower permanent magnets 31 and 32 on the right side, the upper permanent magnet 31 has an S pole on the side facing the magnetic material portion 30a and an N pole on the opposite side, and the lower permanent magnet 32 has The surface facing the magnetic material portion 30a is the N pole, and the opposite surface is the S pole. Of the pair of left permanent magnets 31 and 32, the upper permanent magnet 31 has an N pole on the surface facing the magnetic material portion 30a and an S pole on the opposite side, and the lower permanent magnet 32 has a magnetic material portion 30a. The opposite side is the S pole and the opposite side is the N pole.

  INDUSTRIAL APPLICABILITY The present invention can be particularly suitably used for an engine mount as an active liquid-filled vibration isolator that enhances the vibration isolation effect by controlling the pressure of the internal liquid chamber, and can also be used for other mounts.

It is a longitudinal cross-sectional view of one Example of the active type liquid filled type vibration isolator of the present invention. It is the same half longitudinal section front view. FIG. 6 is a schematic explanatory diagram illustrating the action of an actuator. It is a schematic explanatory drawing which shows the effect | action of an actuator when an electric current is sent through a coil to the positive direction. FIG. 6 is a schematic explanatory diagram illustrating the action of an actuator. It is a schematic explanatory drawing which shows the effect | action of an actuator when an electric current is sent through a coil in the reverse direction. It is a figure which shows the relationship between the force F which acts by the drive of the actuator of an active liquid enclosure type vibration isolator, and time t. It is a figure which shows the relationship between the force F which acts by the drive of the actuator of the conventional active liquid filled type vibration isolator, and time t.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st fixture 2 2nd fixture 3 Anti-vibration base | substrate 3a, 3b Rubber layer 4 1st liquid chamber 5 Rubber wall 5a, 5b Rubber layer 6 2nd liquid chamber 7 Orifice 9 Actuator 10 Orifice formation member 10a Projection piece 11 Ring Protrusion 12 Rubber layer for sealing 13 Diaphragm 14 Screw fastening means 15 Holding member 15a Bottom portion 17 Opening 20 Support side member 21 Lower cylindrical fitting 21a Flange portion 21b Step portion 21c Upper cylindrical portion 22 Upper cylindrical fitting 22a Lower end portion 22b Upper portion 22c Flange portion 22d Notched window portion 23 Cylindrical metal fitting 23a Flange portion 24 Mounting cylinder 24a Flange portion 24b Bottom portion 27 Shaft member 27a Head portion 28 Stator 28a Yoke 29 Magnetic pole portion 30 Movable element 30a Magnetic material portion 31 Permanent magnet 32 Permanent magnet 33 Coil 34 Magnet part 35 Leaf spring 36 Positioning nut Nut fastening 37 pipe member 38 a short pipe 39 40 Cap member 40a flange portion 40b opening 41 受支 member 41a open

Claims (7)

A first fixture disposed on the shaft portion of the apparatus and a cylindrical second fixture disposed on the outside thereof are connected via a vibration-proof base made of a rubber-like elastic material, and the second fixture A rubber wall is provided inside the anti-vibration base and the first fixture, and a first liquid chamber is formed between the anti-vibration base and the rubber wall. What is the first liquid chamber? Separately, a second liquid chamber in which a diaphragm forms a part of the chamber wall is provided, and the first liquid chamber and the second liquid chamber are communicated by an orifice, and a part of the chamber wall of the first liquid chamber is formed. An active liquid-sealed vibration isolator configured such that vibration means is connected to the rubber wall from above, and the rubber wall is vibrated by the vibration means to control the pressure of the first liquid chamber. Because
An orifice forming member bonded to the outer periphery of the rubber wall by vulcanization, and the orifice forming member is fitted and fixed to the inner periphery of the second fixture to form the orifice; A cup-shaped holding member that holds the means is fitted to the upper inner periphery of the second fixture from above, and the bottom of the holding member is an annular shape formed of an upward rubber portion that is provided on the inner peripheral portion of the orifice forming member. By being brought into contact with the protrusion, a space between the second fixture above the orifice forming member, the annular wall and the holding member is formed as a second liquid chamber, and an outer peripheral wall of the second liquid chamber A part of the second fixture that constitutes is formed by a diaphragm;
The vibration means includes a shaft member connected to a central portion of the rubber wall, and the shaft member is configured as at least a part of a movable element that can reciprocate in the axial direction with respect to a stator disposed outside the shaft member. And a structure in which the shaft member is driven in both the forward stroke and the backward stroke to vibrate the rubber wall when a coil provided in the stator is excited. An active liquid-filled vibration isolator characterized by comprising:   The second fixture is composed of a lower cylinder fitting to which a vibration isolating base is coupled and an upper cylinder fitting fixed by caulking to the upper end thereof, and a sealing rubber layer is provided on the inner periphery of the upper cylinder fitting. And the orifice forming member is hermetically fitted to the inner periphery of the lower tubular fitting through the sealing rubber layer at a position where the orifice forming member contacts the upper end of the lower tubular fitting. The active liquid-filled vibration isolator according to claim 1.   A flange portion formed on the upper end portion of the upper tubular fitting has a flange portion, and the flange portion on the upper end portion of the holding member fitted to the upper tubular fitting is screw fastening means with respect to the flange portion of the upper tubular fitting. The active liquid-filled vibration isolator according to claim 2, which is fixed by means of the above.   An actuator as a vibration means is fitted to the holding member, and has a cap member that covers an upper portion thereof, and a flange portion that is formed to project on the outer peripheral portion of the cap member, together with the flange portion of the holding member, 4. The active liquid-filled type vibration damping device according to claim 3, wherein the vibration damping device is fixed to a flange portion of the upper cylindrical metal fitting by screw fastening means.   The actuator includes a magnetic pole portion in which the stator disposed outward of the mover including the shaft member protrudes radially inward, and the magnetic pole portion is adjacent to the axial direction and is different from the magnetic pole portion. At least a pair of permanent magnets forming a pole are arranged, and a coil is wound around the magnetic pole portion, and a combination of a magnetomotive force generated by the coil excitation and a magnetomotive force of each permanent magnet The active liquid-filled vibration isolator according to claim 1, wherein the shaft member is configured to reciprocate.   The actuator includes a mover in which a magnetic material portion is provided on the outer periphery of the shaft member, and an annular stator disposed on the outer side of the mover. The stator is supported so as to be able to reciprocate in the axial direction in the inner space of the stator, and the stator is adjacent to the magnetic pole portion facing the magnetic material portion of the mover in the reciprocating direction of the mover. A pair of permanent magnets opposed to the magnetic material portion in a state where the magnetic material portions are opposite to each other are arranged with the magnetic poles arranged in the direction orthogonal to the reciprocating direction reversed so as to have different polarities, and pass through the pair of permanent magnets 6. The active liquid-filled vibration isolator according to claim 5, wherein a coil capable of generating a magnetic flux is wound around the magnetic pole portion.   The pair of permanent magnets adjacent to each other in the reciprocating direction and having different polarities face each other across the magnetic material portion in a direction orthogonal to the reciprocating direction, and the opposing magnetic poles have different polarities. The active liquid filled type vibration damping device according to claim 6, wherein the arrangement of the magnetic poles is reversed, and the magnetic pole portions of the stator are opposed to each other with the mover interposed therebetween.

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