JP4081022B2 - Active liquid-filled vibration isolator - Google Patents

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. is there.

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 opposite to the vibration-proof base. The first liquid chamber is formed between the rubber wall and the second liquid chamber which is provided separately from the first liquid chamber by an orifice, and forms a part of the chamber wall of the first liquid chamber. An active liquid-filled vibration isolator that vibrates the rubber wall by vibration means connected to the wall to control the pressure of the first liquid chamber, wherein the second fixture includes the vibration exciting device. The lower cylindrical metal fitting that holds the vibration means and the upper cylindrical metal fitting that is press-fitted and fixed to the inner periphery of the upper cylindrical portion. The upper part of the cylindrical fitting constituting the outer peripheral wall of the liquid chamber is vulcanized and bonded, and a cylindrical diaphragm surrounding the outer side of the cylindrical fitting is arranged. The upper end of the cylindrical fitting is liquid-tightly fixed to the upper end of the upper cylindrical fitting together with the upper end of the diaphragm, and an annular orifice forming fitting is vulcanized and bonded to the outer peripheral portion of the rubber wall, An orifice forming bracket is liquid-tightly fitted and fixed to a lower inner periphery of the upper cylindrical bracket together with a lower end portion of the diaphragm, and a lower end of the cylindrical bracket is in contact with an upper surface of the orifice forming bracket, and the cylindrical bracket and the diaphragm Is formed as an air chamber between the diaphragm and the upper cylindrical fitting, and the orifice forming fitting has an orifice for communicating the first liquid chamber and the second liquid chamber. An iron core that is formed and configured as at least a part of a mover that can reciprocate in the axial direction with respect to a stator that is arranged outwardly as a shaft member that is connected to the rubber wall. An actuator of Dogata, the actuator includes a stator mounted on said second fixture made by To設the magnetic material portion on the outer periphery of the shaft member, and capable of reciprocating axially with respect to the stator And a mover supported in the inner space of the stator, and the stator is adjacent to a magnetic pole part facing the magnetic material part of the mover in the reciprocating direction of the mover. A pair of permanent magnets having different polarities in a state where the magnetic poles are arranged in a direction perpendicular to the reciprocating direction, and a coil capable of generating a magnetic flux passing through the pair of permanent magnets, It is wound around the magnetic pole part on the left and right outer sides of the permanent magnets facing each other with a magnetic member interposed therebetween, and by a combination of magnetomotive force generated by the coil excitation and each magnetomotive force of each permanent magnet And reciprocating the shaft member And is configured to excite the rubber wall by driving the shaft member in both forward and backward strokes by exciting a coil provided in the stator. To do.

  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.

  In the present invention, a diaphragm is disposed on the radially outer side of the cylindrical fitting that is vulcanized and bonded to the vibration-proof base and forms the outer peripheral wall of the first liquid chamber, inside the upper cylindrical fitting of the second fixture. An annular second liquid chamber is formed between the first liquid chamber and the cylindrical metal fitting, and the first liquid chamber and the second liquid chamber are communicated by an orifice forming metal fitting which is vulcanized and bonded to the outer peripheral portion of the rubber wall. Since the orifice to be formed is formed, the second liquid chamber can be configured in a compact and simple manner without exposing the diaphragm to the outside, and an orifice structure for communicating the first liquid chamber and the second liquid chamber is also provided. It can be simplified and the number of parts can be reduced. For example, it is only necessary to connect a rubber wall to the shaft member of the vibration means, and the shape structure of the rubber wall itself and the number of parts around the shaft member can be reduced.

  In addition, the diaphragm made of a relatively thin rubber film can be protected by the upper cylindrical fitting, and an air chamber is provided between the diaphragm and the upper cylindrical fitting so that the movement of the diaphragm due to fluid pressure fluctuation can be allowed. It also becomes.

  Further, by fitting and fixing the upper end portion of the tubular fitting and the orifice forming fitting together with the upper and lower ends of the diaphragm to the inner periphery of the upper tubular fitting of the second fixture, the first liquid chamber, The apparatus main body including the second liquid chamber and the orifice can be easily assembled and configured. Therefore, for example, these apparatus main body parts are assembled and configured separately from the vibration means, and then the lower cylinder fitting and the upper cylinder fitting of the second fixture holding the vibration means are press-fitted and fixed. It is also possible to assemble and manufacture the whole.

  In particular, an orifice-forming metal fitting that is vulcanized and bonded to the outer periphery of the rubber wall has a circumferential groove shape that opens outward, and is vulcanized and bonded to the outer periphery of the orifice-forming metal fitting at the lower end of the diaphragm. When the cylindrical reinforcing metal fitting is fitted in a liquid-tight manner and the reinforcing metal fitting is fitted and fixed to the lower inner periphery of the upper cylindrical metal fitting, the assembly work is easy and the orifice Can be easily constructed, and the sealing property can be maintained well.

  Also, a rubber layer for sealing is vulcanized and bonded to the inner peripheral surface of the upper cylindrical metal fitting, and a cylindrical reinforcing metal fitting that is vulcanized and bonded to the upper end portion of the diaphragm and a cylindrical shape that is vulcanized and bonded to the lower end portion. Reinforcing metal fittings are hermetically fitted to the inner circumference of the upper cylindrical metal fittings through the sealing rubber layer, so that the diaphragm constituting the second liquid chamber can be fixed securely and with good sealing properties. The sealing performance of the air chamber existing outside the diaphragm 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 in a pair of permanent magnets forming a heteropolar each other, and the arrangement direction of the magnetic poles perpendicular to the reciprocating direction reversed it is arranged, capable of coils generating a magnetic flux passing through the pair of permanent magnets, the magnetic member ing from configuration ing wound around the magnetic pole in interposed therebetween lateral outward opposing the permanent magnet.

  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. Thereby, a large force can be obtained as compared with the moving magnet type, and the size can be easily reduced.

  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, in the inner part of the upper tubular fitting of the second fixture, the first liquid chamber, the second liquid chamber, the diaphragm forming the chamber wall of the second liquid chamber, the air chamber allowing movement thereof, Furthermore, an orifice that allows communication between the first liquid chamber and the second liquid chamber can be set, the structure and assembly work can be simplified, the number of parts can be reduced, and the space can be reduced. It is possible to provide an active liquid-filled vibration isolator capable of increasing the output 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. Connected, a disk-shaped rubber wall 5 is provided in the second fixture 2 so as to face the vibration isolating base 3, and a space between the vibration isolating base 3 and the rubber wall 5 is formed as a first liquid chamber 4. is doing. The first liquid chamber 4 is connected to a second liquid chamber 6 which forms a part of the chamber wall by a diaphragm 7 which is provided separately from the first liquid chamber 4 and an orifice 8.

  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 flange 1a projecting outward at a substantially central portion in the vertical direction, and a rubber layer 3a integral with the vibration-proof base 3 is formed on the upper surface of the flange 1a by a vulcanizing adhesive means. It is installed. The first fixture 1 has a screw hole 1b that opens upward in its axial center, and a connection bolt (not shown) is screwed into the screw hole 1b so as to be connected to the engine. It has become. A stopper fitting may be mounted on the flange 1a of the first fixture 1 in some cases.

  The second fixture 2 is composed of a lower tubular fitting 21 and an upper tubular fitting 22. The lower cylindrical fitting 21 is formed by continuously forming a large-diameter upper end side cylindrical portion 21c via an inclined portion 21b on a lower side cylindrical portion 21a that holds the actuator 9 serving as the vibration means. The lower part of the upper cylinder fitting 22 is press-fitted and fixed to the upper end side cylinder part 21c. The first liquid chamber 4, the second liquid chamber 6, the orifice 8, and the like are incorporated in the inside of the upper cylindrical metal member 22 as will be described later.

  The anti-vibration base 3 is formed in a hollow truncated cone shape on the bottom side, and the first fixture 1 is vulcanized and bonded to the upper end of the anti-vibration base 3 so that the lower side is embedded.

  The lower end portion of the vibration-isolating base 3 has a tapered upper portion 10a of the cylindrical fitting 10 constituting the outer peripheral wall of the first liquid chamber 4, that is, a tapered shape that gradually expands upward as shown in the figure. An upper portion 10a formed is vulcanized and bonded, and a cylindrical lower portion 10b extends to a portion of the lower rubber wall 5 to form an outer peripheral wall of the first liquid chamber 4. Reference numeral 10a1 denotes an upper end portion of the upper portion 10a. In the case of the figure, a rubber layer 3 b continuous from the vibration isolating base 3 is provided on the inner periphery of the lower part 10 b of the cylindrical metal fitting 10.

  On the outer side of the cylindrical metal fitting 10, a diaphragm 7 is formed of a relatively thin rubber film surrounding the cylindrical metal fitting 10 and has a constricted shape with a central portion in the axial direction (vertical direction) bulging inward. Is arranged. Cylindrical reinforcement fittings 71 and 72 are vulcanized and bonded to the upper end and the lower end of the diaphragm 7, respectively. In the case of the figure, thin rubber layers 71a, 72a integral with the diaphragm 7 are respectively vulcanized and bonded to the outer peripheral surface of the reinforcing metal fitting 71 at the upper end and the inner peripheral surface of the reinforcing metal fitting 72 at the lower end. Yes. The reinforcing bracket 71 at the upper end is fitted and fixed to the outer periphery of the upper end 10 a 1 of the cylindrical bracket 10 by press-fitting means, and the upper end 10 a 1 of the cylindrical bracket 10 together with the reinforcing bracket 71 is 2 The upper fitting 22 of the fixture 2 is liquid-tightly fitted and fixed by caulking.

  Further, an annular orifice forming metal fitting 11 having a circumferential groove shape opened toward the radially outer side is vulcanized and bonded to the outer peripheral portion of the rubber wall 5. Thin rubber layers 5 a and 5 b integrated with the rubber wall 5 are provided on the upper and lower surfaces of the orifice forming metal fitting 11. The orifice forming metal fitting 11 has a reinforcing metal fitting 72 at the lower end of the diaphragm 7 fitted in a liquid-tight manner on the outer periphery of the orifice forming metal fitting 11 via the rubber layer 72a. It is liquid-tightly fitted and fixed to the periphery, and is integrally assembled. In this state, the lower end of the cylindrical metal fitting 10 is in contact with the upper surface of the orifice-forming metal fitting 11 so that the sealed state is maintained. Held in a state. In particular, a sealing rubber layer 22a is vulcanized and bonded to the inner peripheral surface of the upper cylindrical metal fitting 22, and the reinforcing metal fittings 71 at the upper and lower ends of the diaphragm 7 are provided via the sealing rubber layer 22a. 72 are fitted in an airtight manner. In the case of the figure, a cover plate 15 covering the lower portion of the rubber wall 5 is caulked and fixed together with the orifice forming metal fitting 11 below the orifice forming metal fitting 11. A through-hole 16 is provided at the center of the cover plate 15 to allow the shaft member of the actuator 9 described later to move up and down. The cover plate 15 also serves to suppress the actuator 9.

  By being assembled in this way, the space between the tubular metal fitting 10 and the diaphragm 7 is formed as the second liquid chamber 6, and the space between the diaphragm 7 and the upper tube metal fitting 22 is formed as the air chamber 13. . Further, the concave groove portion of the orifice-forming metal fitting 11 is formed as an orifice 8 for communicating the first liquid chamber 4 and the second liquid chamber 6 by communication portions 8a and 8b.

  In the assembled state, the lower portion of the upper tubular fitting 22 is press-fitted and assembled to the upper end side tubular portion 21 c of the lower tubular fitting 21 of the second fixture 2.

  A support bracket 19 is fixed to the outer peripheral portion of the lower cylindrical portion 21a of the lower cylindrical metal member 21 by welding means or the like, and a bottom plate 23 is integrally provided on the lower surface of the support bracket 19 and is attached to a frame on the vehicle body side. A plurality of connecting bolts 20 for connecting 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 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 movable element 30 is attached to the rubber wall until the oscillating base 3, the rubber wall 5, and the diaphragm 7 are assembled to the upper cylindrical fitting 22 of the second fixture 2. 5 and connected to the shaft member 27, the pipe member 37, the plate springs 35, 35, the short pipe 38, The mover 30 can be assembled and configured by fitting 38 and tightening and fixing with the tightening nut 36. The assembled mover 30 is configured such that when the upper cylindrical fitting 22 of the second fixture 2 is press-fitted into the upper cylindrical portion 21c of the lower cylindrical fitting 21, the lower cylindrical portion 21a of the lower cylindrical fitting 21 is inserted. Is inserted into an inner hole portion of the stator 28 press-fitted into the stator, and is connected to and supported by the stator 28 via the leaf springs 35 and 35 so as to reciprocate in the vertical direction (axial direction of the shaft member 27). The

  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.

  In addition, the vibration isolator of the present invention is provided with the second liquid chamber and the diaphragm 7 on the radially outer side of the first liquid chamber 4 inside the upper cylindrical fitting 22 of the second fixture 2, and further, the first liquid chamber 4 and the second liquid chamber 6 are incorporated into the orifice 8, so that the second liquid chamber 6 can be configured compactly and easily without exposing the diaphragm 7 to the outside, and the orifice structure is also simplified. And the number of parts can be reduced.

  The present invention is not limited to the engine mount, and various implementations are possible. For example, the present invention can also be applied to a mount provided between the suspension member and the 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. It is a schematic explanatory drawing which shows the effect | 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. It is a schematic explanatory drawing which shows the effect | 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 conventional active liquid filled type vibration isolator.

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 Rubber layer 6 2nd liquid chamber 7 Diaphragm 71 Cylindrical reinforcement metal fitting 7b Bottom end cylinder Reinforcing plate 8 Orifice 9 Actuator 10 Cylindrical bracket 11 Orifice forming bracket 22a Rubber layer for sealing 13 Air chamber 15 Cover plate 16 Through hole 21 Lower cylindrical bracket 22 Upper cylindrical bracket 21a Lower side cylindrical portion 21b Step portion 21c Upper end side cylindrical portion 23 bottom plate 23a convex portion 27 shaft member 28 stator 28a yoke 29 magnetic pole portion 30 mover 30a magnetic material portion 31 permanent magnet 32 permanent magnet 33 coil 34 magnet portion 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 (5)

The first fixture and the cylindrical second fixture are connected via a vibration-proof base made of a rubber-like elastic material, a rubber wall is provided facing the vibration-proof base, the vibration-proof base, the rubber wall, The first liquid chamber is connected to the second liquid chamber provided separately from the first liquid chamber by an orifice and 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 vibrate the rubber wall by vibration means to control the pressure of the first liquid chamber,
The second fixture is composed of a lower cylindrical bracket that holds the excitation means, and an upper cylindrical bracket that is press-fitted and fixed to the inner periphery of the upper end side cylindrical portion,
The upper part of the cylindrical metal part constituting the outer peripheral wall of the first liquid chamber is vulcanized and bonded to the lower end part of the vibration isolating base at the inner side of the upper cylindrical metal part and surrounds the outer side of the cylindrical metal part. A cylindrical diaphragm is disposed, and an upper end portion of the cylindrical fitting is liquid-tightly fixed to an upper end portion of the upper cylindrical fitting together with an upper end portion of the diaphragm, and an annular orifice forming fitting is provided on the outer peripheral portion of the rubber wall. Is vulcanized and bonded, and the orifice forming fitting is liquid-tightly fitted and fixed to the lower inner periphery of the upper tubular fitting together with the lower end of the diaphragm, and the lower end of the cylindrical fitting is in contact with the upper surface of the orifice forming fitting, A space between the tubular fitting and the diaphragm is formed as the second liquid chamber, a space between the diaphragm and the upper tubular fitting is formed as an air chamber, and the orifice forming fitting is formed between the first liquid chamber and the second liquid chamber. Communicating liquid chamber Orifice to form will be that,
Examples vibrating means comprise at least a portion configured as a core movable type actuator of the reciprocable armature in the axial direction with respect to the shaft member connected to the rubber wall stator arranged on the outside, the actuator Is formed by providing a stator attached to the second fixture and a magnetic material portion on the outer periphery of the shaft member, and capable of reciprocating in the axial direction with respect to the stator. And a pair of stators having different polarities adjacent to each other in a reciprocating direction of the mover on a magnetic pole portion facing the magnetic material portion of the mover. The permanent magnets are arranged with the arrangement of magnetic poles in the direction orthogonal to the reciprocating direction reversed, and coils that can generate magnetic flux passing through the pair of permanent magnets are opposed to each other with the magnetic member interposed therebetween. The magnetic pole part on the left and right outer sides of the magnet Wound would be around, in combination with each of the magnetomotive force of the electromotive force and the respective permanent magnets produced by the coil energized, is configured to the shaft member so as to reciprocate,
An active liquid configured to excite the rubber wall by driving the shaft member in both forward and backward strokes by exciting a coil provided in the stator. Enclosed vibration isolator.   An orifice-forming metal fitting that is vulcanized and bonded to the outer periphery of the rubber wall forms a circumferential groove shape that opens outward, and a cylindrical shape that is vulcanized and bonded to the outer periphery of the orifice-forming metal fitting at the lower end of the diaphragm The active liquid-filled vibration isolator according to claim 1, wherein the reinforcing metal fitting is fitted in a liquid-tight manner, and the reinforcing metal fitting is fitted and fixed to the lower inner periphery of the upper cylindrical metal fitting.   A rubber layer for sealing is vulcanized and bonded to the inner peripheral surface of the upper cylindrical metal fitting, and a cylindrical reinforcing metal fitting that is vulcanized and bonded to the upper end portion of the diaphragm and a cylindrical reinforcing metal fitting that is vulcanized and bonded to the lower end portion. 3. The active liquid-filled type vibration damping device according to claim 1, wherein the vibration-proof device is hermetically fitted to the inner periphery of the upper cylindrical metal fitting through the sealing rubber layer. 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 prevention according to any one of claims 1 to 3, 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. Shaker. The plate surface faces the axial direction of the mover, the shaft via a pair of leaf springs positioned at intervals in the cardiac direction, and supports the shaft member of the mover to the stator claim 1 The active liquid-filled vibration isolator according to any one of -4.

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