JP2005155885A - 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 isolator capable of simplifying the structure, increasing the output, reducing the number of parts, and contributing to downsizing. .

  In the present invention, the first fixture and the cylindrical second fixture are connected via a vibration-proof base made of a rubber-like elastic material, and a rubber wall is provided on the second fixture so as to face the vibration-proof base. In addition, a first liquid chamber is provided between the vibration isolating base and the rubber wall, and a second liquid chamber in which a diaphragm forms a part of the chamber wall is provided separately from the first liquid chamber, and the first liquid chamber and the The second liquid chamber is connected by an orifice, and the rubber wall is vibrated and displaced by vibration means connected to the rubber wall forming a part of the chamber wall of the first liquid chamber. An active liquid-filled vibration isolator configured to control pressure, wherein the vibration isolator base is covered outside the anti-vibration base over the first fixture and the second fixture. A pipe which is provided with a diaphragm for forming a second liquid chamber between the base and vulcanized and bonded to the lower end of the diaphragm And an annular orifice-forming bracket vulcanized and bonded to the lower end portion of the vibration-proof base, and an outer peripheral portion in which the annular reinforcing bracket of the rubber wall is embedded, respectively, with respect to the upper inner periphery of the second fixture The orifice forming fitting is fixed and assembled by press-fitting or fitting means, and the orifice forming metal fitting forms an orifice for communicating the first liquid chamber and the second liquid chamber, and is connected to the rubber wall as the vibration means. By providing an iron core movable actuator configured as at least a part of a mover capable of reciprocating in the axial direction with respect to a stator having a shaft member arranged on the outer side thereof, and exciting the coil provided in the stator, the shaft The member is driven in both the forward stroke and the backward stroke to vibrate the rubber wall.

  By adopting 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. 7, the rising of the force F [N] generated in 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 sinusoidal alternating current is passed through the coil, the Ft curve can be made into a sinusoidal curve corresponding to a sinusoidal curve representing the current-time relationship of the sinusoidal alternating current. Therefore, it is not necessary to provide the third liquid chamber as a correction means for making the Ft curve into a sine wave curve, and the filter member becomes unnecessary and the increase in the number of parts can be suppressed.

  And since the said 2nd liquid chamber is formed by providing the diaphragm which covers this anti-vibration base on the outer side of the said anti-vibration base between the 1st fixture and the 2nd fixture, the formation structure of a 2nd liquid chamber Can be simplified, and it is only necessary to connect a rubber wall to the shaft member of the vibration means, and the configuration of the rubber wall itself and the number of parts around the shaft member can be reduced.

  In addition, an orifice-forming fitting vulcanized and bonded to the lower end of the vibration-proof base, a cylindrical fitting vulcanized and bonded to the lower end of the diaphragm, and an outer peripheral portion in which the annular reinforcing bracket of the rubber wall is embedded, By fixing and assembling to the upper inner periphery of the second fixture by press-fitting or fitting means, the orifice-forming fitting also serves as a fitting for coupling the vibration-proof base and the second fixture. Therefore, the number of parts can be reduced and a space can be reduced.

  In particular, a tube fitting vulcanized and bonded to the lower end portion of the diaphragm is press-fitted and fixed to the upper inner periphery of the second fixture, and is vulcanized and bonded to the lower end portion of the vibration-proof base and directed outward. If a configuration is adopted in which a ring-shaped orifice-forming metal fitting having a circumferential groove shape that is open and an outer peripheral portion of the rubber wall are liquid-tightly fitted and fixed to the inner circumference of the cylindrical metal fitting, In addition to being easy to work, the orifice can be configured simply and the sealing performance can be maintained well.

  In the iron core movable actuator, the magnetic pole portion of the stator arranged on the outer side of the shaft member is provided with at least a pair of permanent magnets adjacent to each other in the axial direction and having different polarities, and the magnetic pole portion A coil is wound around and the shaft member is reciprocated by a combination of a magnetomotive force generated by excitation of the coil and a magnetomotive force of each permanent magnet. It is.

  Specifically, as the actuator, a stator attached to the second fixture, and a magnetic material portion is provided on the outer periphery of the shaft member, and the actuator is capable of reciprocating in the axial direction with respect to the stator. A mover supported in the inner space of the stator, and the stator is adjacent to the magnetic pole part facing the magnetic material part of the mover in the reciprocating direction of the mover The pair of permanent magnets opposed to the magnetic material portion are arranged with the arrangement of magnetic poles in the direction orthogonal to the reciprocating direction so as to be different from each other, and the magnetic flux passing through the pair of permanent magnets is It is assumed that a generatable coil is wound around the magnetic pole portion of the stator.

  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 is applied to 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. As a result, it is possible to obtain a much greater force than in the case of the moving magnet type, and thus it is possible to easily reduce the size.

  In the active liquid filled type vibration isolator, the plate member faces the axial direction of the shaft member, and the shaft member is fixed to the stator via a pair of leaf springs that are spaced apart in the axial direction. If it is supported, frictional resistance is not applied to the shaft member of the mover along with the reciprocating movement, and the reciprocating motion of the shaft member becomes smooth.

  According to the present invention, it is possible to simplify the assembly and coupling work of the vibration isolating base, the diaphragm, and the rubber wall to the second fixture, and it is possible to simplify the configuration of the orifice for communicating the first liquid chamber and the second liquid chamber. It is possible to provide an active liquid-filled vibration isolator capable of reducing the number of parts, reducing the space, and further increasing the output of the actuator and reducing the size.

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

  This liquid-filled vibration isolator has a first attachment 1 attached to an engine and a cylindrical second attachment 2 attached to a frame on the vehicle body via an anti-vibration base 3 made of a rubber-like elastic material. The second fixture 2 is provided with a disk-shaped rubber wall 5 facing the vibration isolating base 3, and the first liquid chamber 4 is formed between the vibration isolating base 3 and the rubber wall 5. ing. A second liquid chamber 6 is formed outside the anti-vibration base 3 so as to cover the anti-vibration base 3 and between the outer peripheral surface 3A of the anti-vibration base 3 and the first liquid chamber 4. A narrowed tapered cylindrical diaphragm 7 is provided across the first fixture 1 and the second fixture 2, and the second liquid chamber 6 and the first liquid chamber 4 extend along the second fixture 2. Are connected by an orifice 8 to be described later.

  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 fixed to the second fixture 2 as will be described later.

  The first fixture 1 has a cylindrical body having a substantially T-shaped cross section with an upper portion projecting radially outward in a flange shape, and a lower body 1a embedded in the vibration isolating base 3, and a lower end portion is radially outward. And a cap-shaped upper body 1b projecting in a flange shape. The lower body 1a has a screw hole 10a opening upward in the axial center portion thereof, and the upper body 1b has a through hole 10b continuous with the screw hole 10a in the axial center portion thereof. The lower body 1a and the upper body 1b are configured such that the lower surface side concave portion 1b1 of the upper body 1b is fitted into a tight fit with respect to the central upper end 1a1 projecting upward from the flange-shaped portion of the lower body 1a. The two flange-shaped portions are coupled in a pair in a state where they face each other. In the case of the figure, a part of the upper end portion 7a of the diaphragm 7 is sandwiched and sealed between the flange portions. The first fixture 1 is connected to the engine by a connecting bolt (not shown) screwed into the female screw portion 10 through the through hole 10b.

  The second fixture 2 includes a lower portion 2a for holding the actuator 9 and an upper portion 2b having a cylindrical shape larger in diameter than the lower portion continuous to the lower portion 2a via an inclined portion 2c. On the inner periphery of the upper part 2 b above the step 2 c of the second fixture 2, a tube fitting 11 vulcanized and bonded to the lower end part 7 b of the diaphragm 7 is provided on the inner circumference of the upper part 2 b of the second fixture 2. It is press-fitted and fixed to. Further, on the inner periphery of the cylindrical metal fitting 11, an annular orifice-forming metal fitting 12 is formed in a circumferential groove shape which is vulcanized and bonded to the lower end portion of the vibration isolating base 3 and opens radially outward, The outer peripheral portion of the rubber wall 5, particularly the outer peripheral portion 15 in which the annular reinforcing metal fitting 13 is embedded in a pair by vulcanizing adhesive means, is connected to the lower end portion 7 b of the diaphragm 7 and vulcanized and bonded to the cylindrical metal fitting 11. The rubber layer 16 is fitted in a liquid-tight manner and fixed in a state of being in contact with the upper and lower sides, thereby being assembled in a pair. As a result, the concave groove portion of the orifice forming metal fitting 12 is formed as the orifice 8 communicating with the first liquid chamber 4 and the second liquid chamber 6 through the communication portions 8a and 8b, respectively.

  In the case of the figure, after the orifice forming fitting 12 and the outer peripheral portion 15 of the rubber wall 5 are fitted to the tubular fitting 11, the lower end of the tubular fitting 11 is bent inward, and the orifice forming fitting 12 is shown. And the said outer peripheral part 15 is hold | maintained so that it may not remove easily.

  Although it is possible to adopt a configuration in which the orifice forming metal fitting 12 and the outer peripheral portion 15 of the rubber wall 5 are liquid-tightly fitted to the upper portion 2b of the second fixture 2, in practice, the cylindrical metal fitting 11 is used as described above. It is easy to fit and fix to the inner circumference.

  For example, the vibration isolator base 3, the diaphragm 7, and the rubber wall 5 are combined in the liquid with the lower body 1 a and the upper body 1 b of the first fixture 1 as described above, and to the cylindrical metal fitting 11. On the other hand, the orifice-forming metal fitting 12 and the outer peripheral portion 15 are fitted and assembled in a state in which liquid is sealed, and the tubular metal fitting 11 can be press-fitted and assembled into the upper portion 2b of the second fixture 2 in the air.

  A support bracket 19 is fixed to the outer periphery of the lower portion 2a of the second fixture 2 by welding means or the like, and a bottom plate 23 is continuously provided on the lower surface of the support bracket 19, and the bottom plate 23 is connected to the vehicle body side. A plurality of connecting bolts 20 for connecting to the frame are fixed. The bottom plate 23 is provided so that the actuator 9 can be received and supported by an inwardly upward convex portion 23a.

  The anti-vibration base 3 is formed in the shape of a circular truncated cone on the bottom side, and its upper end is vulcanized and bonded to the lower body 1a of the first fixture 1 and the lower end is bonded to the orifice-forming bracket 12. Has been.

  The diaphragm 7 is made of a rubber-like elastic material, and its upper end 7 a is vulcanized and bonded to the flange-like portion 1 b 2 of the upper body 1 b of the first fixture 1, and the lower end 7 b is added to the cylindrical metal fitting 11. Sulfur bonded.

  The iron core movable electromagnet actuator 9 which is the vibration means of the rubber wall 5 sets the shaft member 27 that constitutes at least a part of the movable member that can reciprocate in the axial direction with respect to the stator in a vertical posture. A disc-shaped head portion 26 is formed in a projecting manner at the tip of the shaft member 27, and is embedded and connected to the central portion of the rubber wall 5 in the vulcanization molding process of the rubber wall 5. Then, 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 as will be described later. is there. Next, the structure and operation of the actuator 9 will be described in detail.

  The actuator 9 includes a stator 28 attached to the second fixture 2 and a mover 30 supported in an inner space (axial part) of the stator 28 so as to be capable of reciprocating in the axial direction with respect to the stator 28. It has.

  The stator 28 includes 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 the movable element 30 at a central portion in the axial direction of the yoke 28a. The magnetic pole portions 29 and 29 protrude from both sides toward the inner space so as to face each other.

  The mover 30 basically has a magnetic material portion 30a as a mover iron core formed by laminating a number of metal disks made of the same magnetic metal at an intermediate portion in the axial center direction of the shaft member 27. It has been made.

  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, a positioning nut 36a in the shaft member 27 is fitted and engaged with the upper stepped portion 27a. And a pair of short pipes 38, 38 sandwiching the leaf springs 35, 35 and the pipe member 37, and further, the screw portion 27b at the end of the shaft member 27 is fastened to the screw portion 27b. The nut 36 is fixed by screwing and tightening. Reference numeral 39 denotes a lock nut for preventing the tightening nut 36 from loosening.

  By adopting such a configuration, only the shaft member 27 of the mover 30 is rubberized until the outer peripheral portion 15 of the rubber wall 5 is fitted to the cylindrical metal fitting 11 together with the orifice forming metal fitting 12 and the like. After being assembled, the pipe member 37, the leaf springs 35, 35, and the short pipe 38, to which the positioning nut 36a and the magnetic material portion 30a are fixed, are attached to the shaft member 27. , 38 are fitted together and fastened and fixed by the tightening nut 36, whereby the mover 30 can be assembled. The assembled mover 30 has an inner hole portion of the stator 28 that is press-fitted into the lower portion 2a of the second fixture 2 when the cylindrical fitting 11 is press-fitted into the upper portion 2b of the second fixture 2. And is connected to and supported by the stator 28 via the leaf springs 35 and 35 so as to be able to reciprocate in the vertical direction (axial direction of the shaft member 27).

  The plate springs 35, 35 are formed in a rectangular ring shape partially constricted inwardly so as to bypass a coil portion to be described later, and are spaced apart from each other in the vertical direction with the magnetic material portion 30a. It is located with a gap in between. 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 of the leaf spring 35 at the outer peripheral portion of the stator 28. The case members 40 and 41 are fixed to a fastening portion by a bolt 42 that fastens and fixes the yoke members 28a with the yoke 28a interposed therebetween, and are supported so as to be elastically deformable. Openings 40a and 41a through which the positioning nut 36a and the tightening nut 36 can pass are provided at the center of the upper and lower case members 40 and 41, and also at the center of the convex portion 23a of the bottom plate 23. An opening 23b through which the nuts 36a, 36 can pass is formed. Thereby, the part of the said needle | mover 30 can be moved up and down without a problem.

  As shown also in FIGS. 2 to 5, 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. 2 and 4, the pair of coils 33 and 33 are connected to each other. As shown in FIGS. 2 and 3, 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. 2 and 3, the white arrows pointing in the left-right direction indicate 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. 3, 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. 3) 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. 5, 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.

  Then, as shown in FIG. 6, an Ft curve showing the relationship between the force F [N] generated in the liquid-filled vibration isolator by the driving of the actuator 9 and the time t [s] is expressed as a sinusoidal alternating current. A sinusoidal curve corresponding to the sinusoidal curve representing the current-time relationship can be obtained.

  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. For example, the mover 30 may be one in which the magnetic material portion 30a is directly fixed to the shaft member 27 by press-fitting means or the like.

  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.

It is a longitudinal cross-sectional view of the active type liquid filled type vibration isolator of the present invention. 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 and time t which are added to an active liquid enclosure type vibration isolator. It is a figure which shows the relationship between the force F and time t which are applied to the active type liquid enclosure type vibration isolator of the conventional structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st fixture 1a Lower body 1b Upper body 2 2nd fixture 2a Lower 2b Upper 2c Step part 2d Bottom part 3 Anti-vibration base | substrate 4 1st liquid chamber 5 Rubber wall 6 2nd liquid chamber 7 Diaphragm 7a Upper end part 7b Lower end part DESCRIPTION OF SYMBOLS 8 Orifice 9 Actuator 11 Cylindrical metal fitting 12 Orifice formation metal fitting 13 Annular reinforcement metal fitting 15 Outer peripheral part of rubber wall 27 Shaft member 28 Stator 28a Yoke 29 Magnetic pole part 30 Movable element 30a Magnetic material part 31 Permanent magnet 32 Permanent magnet 33 Coil 34 Magnet part 35 Leaf spring 36 Tightening nut 36a Positioning nut 37 Pipe member 38 Short pipe 40, 41 Upper and lower case members 40a, 41a Opening

Claims (6)

The first fixture and the cylindrical second fixture are connected via a vibration-proof base made of a rubber-like elastic material, and a rubber wall is provided on the second fixture so as to face the vibration-proof base. A first liquid chamber is provided between the base and the rubber wall, and a second liquid chamber in which a diaphragm forms part of the chamber wall is provided separately from the first liquid chamber, and the first liquid chamber and the second liquid chamber are provided. Are communicated with each other by an orifice, and the pressure of the first liquid chamber is controlled by exciting the rubber wall by a vibration means connected to the rubber wall forming a part of the chamber wall of the first liquid chamber. Active liquid-filled vibration isolator,
A diaphragm that covers the vibration isolating base and forms a second liquid chamber between the first anti-vibration base and the anti-vibration base is provided outside the anti-vibration base,
A tube fitting vulcanized and bonded to the lower end of the diaphragm, an annular orifice forming bracket vulcanized and bonded to the lower end of the vibration isolating base, and an outer peripheral portion in which the annular reinforcing bracket of the rubber wall is embedded. Each of the second fixtures is fixed and assembled to the inner periphery of the upper part by press-fitting or fitting means, and the orifice forming bracket forms an orifice for communicating the first liquid chamber and the second liquid chamber. ,
The vibrating means includes an iron core movable actuator configured as at least a part of a movable element capable of reciprocating in the axial direction with respect to a stator arranged on the outer side of a shaft member connected to the rubber wall. An active liquid-sealed type wherein the shaft member is driven in both forward and backward strokes to excite the rubber wall by exciting a coil provided in the child. Anti-vibration device.   A tube fitting vulcanized and bonded to the lower end of the diaphragm is press-fitted and fixed to the upper inner periphery of the second fixture, and is vulcanized and bonded to the lower end of the vibration isolator base and opened outward. 2. An active type liquid enclosure according to claim 1, wherein an annular orifice forming metal fitting having a concave groove shape in the circumferential direction and an outer peripheral portion of the rubber wall are liquid-tightly fitted and fixed to an inner circumference of the cylindrical metal fitting. Type vibration isolator.   In the actuator, at least a pair of permanent magnets having different polarities adjacent to each other in the axial direction are arranged on the magnetic pole part of the stator arranged outside the shaft member, and a coil is disposed around the magnetic pole part. 3. The shaft member according to claim 1, wherein the shaft member is reciprocated by a combination of a magnetomotive force generated by coil excitation and a magnetomotive force of each permanent magnet. Active liquid-filled vibration isolator.   The actuator includes a stator attached to the second fixture, and a magnetic material portion provided on an outer periphery of the shaft member, and is capable of reciprocating in the axial direction with respect to the stator. The stator has a magnetic pole part facing the magnetic material part of the mover, and the magnetic poles opposite to each other in a state adjacent to the reciprocating direction of the mover. A pair of permanent magnets is disposed with the arrangement of magnetic poles in a direction orthogonal to the reciprocating direction reversed, and a coil capable of generating magnetic flux passing through the pair of permanent magnets is wound around the magnetic pole portion. The active liquid-filled vibration isolator according to claim 3.   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 interposed therebetween in a direction perpendicular to the reciprocating direction, and the opposing magnetic poles are different from each other. The active liquid filled type vibration damping device according to claim 4, 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. 5. The shaft member of the mover is supported on the stator via a pair of leaf springs whose plate surfaces face the axial direction of the mover and are spaced apart in the axial direction. Or an active liquid-filled vibration isolator according to 5.

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