WO2005088156A1

WO2005088156A1 - Active type liquid-sealed vibration isolator

Info

Publication number: WO2005088156A1
Application number: PCT/JP2004/003444
Authority: WO
Inventors: Hideaki Shimazu; Toshiyuki Kitano
Original assignee: Toyo Tire & Rubber Co. Ltd.
Priority date: 2004-03-15
Filing date: 2004-03-15
Publication date: 2005-09-22

Abstract

The invention provides an active type liquid-sealed vibration isolator having a simplified construction, an increased output, and a reduced number of parts, contributing to size reduction. As a means therefor, a first attaching element (1) and a second attaching element (2) are connected through a vibration isolation base body (3). The second attaching element (2) is provided with a rubber wall (5) which forms a first liquid chamber (4). A diaphragm (7) forms a second liquid chamber (6) forming part of the chamber wall. The first and second liquid chambers (4, 6) communicate with each other through an orifice (8). A core movable type actuator (9) is constructed such that an axial member (27) connected to the rubber wall (5) is constituted as part of a mover (30) which is axially reciprocable with respect to a stator (28). The coil (33) of the stator (28) is excited to drive the axial member (27) on both strokes, i.e., forward stroke and backward stroke, thereby applying vibrations to the rubber wall (5) and controlling the pressure in the first liquid chamber (4).

Description

Active liquid filled type vibration damping device [Technical field]

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

[Background technology]

The active type liquid filled type vibration damping device is generally mounted on a first mounting member, a cylindrical second mounting member, a vibration-isolating base made of a rubber-like elastic material connecting these, and a second mounting member. A first diaphragm that forms a liquid enclosing chamber between the vibration isolating substrate and the first diaphragm, and a partition body that partitions the liquid enclosing chamber into a first liquid chamber on the vibration isolating substrate side and a second liquid chamber on the first diaphragm side; an orifice communicating the first liquid chamber and the second liquid chamber, and a rubber wall forming an ^e portion of the chamber wall of the first liquid chamber, controlling the pressure of said first liquid chamber to the rubber wall vibration driven It is configured with an electromagnetic actuator.

For example, it is mounted on an automobile as an engine mount, and by controlling the pressure in the first liquid chamber through the actuator, an excellent vibration suppression effect can be obtained, for example, by reducing the dynamic spring of the mount. ing.

Conventionally, the above-mentioned active type liquid filled type vibration damping device is disclosed in Japanese Patent Application Laid-Open No. 2001-304304, Japanese Patent Application Laid-Open No. 2000-1955342. As described above, an orifice is formed between the outer peripheral portion of the partition body and the inner peripheral surface of the second mounting member, and a concave portion formed in the center of the partition body serves as a movable element of an actuator that serves as a vibration means. The rubber wall is vulcanized and formed over the inner peripheral portion of the concave portion and the distal end portion of the shaft member, and the inner peripheral portion of the second fixture and a part of the shaft member are inserted. And to The diaphragm is vulcanized and formed, and the rubber wall is provided so as to be able to vibrate through a shaft member of the actuator.

According to the above-described conventional configuration, the shaft member of the actuator is inserted into the recess formed in the center of the partition body, and the rubber wall is vulcanized over the inner peripheral portion of the recess and the tip of the shaft member. Molding and vulcanizing the diaphragm over the inner peripheral part of the second fixture and part of the shaft member, which increases the number of parts around the rubber wall and shaft member and complicates the structure Had been transformed.

Further, as a driving method of an electromagnet type actuator, as disclosed in Japanese Patent Application Laid-Open No. 2001-304403, two coils are arranged coaxially at an interval above and below. A shaft member with a magnet is inserted through the air core, and the shaft member with the magnet is moved in the axial direction by the electromagnetic force generated between the coil and the magnet when the coil is energized. In the case of a so-called moving magnet type that reciprocates, the outer diameter becomes large in order to obtain a large force, and it is not suitable for miniaturization and weight reduction. There is a problem that it is weak to shock.

Also, as disclosed in Japanese Patent Application Laid-Open No. 2002-1955342, a yoke member and a coil are arranged in a part of an inner part, and a part of a coil surrounding the yoke member is reciprocated in an axial direction. When the outer portion is connected to the rubber wall to vibrate, the outer portion is separated from the wall surface of the holding bracket and supported only by the shaft center portion. In addition to making the support unstable, it is necessary to increase the outer diameter to obtain a large output.

[Disclosure of the Invention]

An object of the present invention is to provide an active-type liquid-filled type vibration damping device that can simplify the structure, increase the output, and reduce the number of components to contribute to downsizing. is there. According to the present invention, a first mounting member and a cylindrical second mounting member are connected via a vibration-proof base made of a rubber-like elastic material, and a rubber wall is provided on the second mounting member so as to face the vibration-proof base. A first liquid chamber is provided between the vibration-isolating base and the rubber wall, and a second liquid chamber is provided in which a diaphragm forms a part of the chamber wall separately from the first liquid chamber. The first liquid chamber is communicated with the second liquid chamber by an orifice, and the rubber wall is vibrated and displaced by vibrating means connected to the rubber wall forming a part of the chamber wall of the first liquid chamber. An active-type liquid-filled vibration damping device that controls the pressure of the vibration-damping base, covering the vibration-damping base over the first mounting member and the second mounting member outside the vibration-damping base. A diaphragm for forming a second liquid chamber is provided between the diaphragm and the vibration-proof substrate, and the diaphragm is vulcanized and adhered to the lower end of the diaphragm. A metal fitting, an annular orifice forming metal that is vulcanized and bonded to a lower end of the vibration-proof base, and an outer peripheral portion of the rubber wall where the annular reinforcing metal is embedded. The orifice forming bracket forms an orifice for communicating the first liquid chamber and the second liquid chamber while being fixed to the circumference by press-fitting or fitting means, and the orifice is formed as the vibrating means. A movable iron core actuating member is provided, which is configured as at least a part of a movable member that can reciprocate in the axial direction with respect to a stator in which a shaft member connected to a wall is disposed on an outer side thereof. By being excited, the shaft member is driven in both directions of a forward stroke and a backward stroke to excite the rubber wall.

According to the present invention, by adopting the above configuration, it is possible to eliminate a delay in rising of a force generated by a reciprocating motion of a shaft member of the actuator as a vibration means, and to control a pressure of the first liquid chamber. Not only can it be performed smoothly and quickly, but also the increase in the number of parts can be suppressed. In addition, a large output can be obtained without increasing the outer diameter because of the movable iron core type.

For example, Actuyue is configured as a solenoid and connected to a rubber wall. In a structure in which the shaft member of Kuchiyue is electrically driven in the forward stroke and the return stroke is mechanically restored by the elastic force of the coil spring, the elastic force of the coil spring is resisted at the beginning of the forward stroke. Therefore, as shown in Fig. 7, the rise of the force F [N] acting on the anti-vibration device by driving the actuator is delayed by t 1 [s (sec)], and the delay t 1 The value tends to vary for each forward stroke. In the return stroke, the force F drops sharply, and the F-t curve (curve representing the relationship between F and time t) is not smooth, so that there is a problem that vibration cannot be absorbed accurately. In order to solve this problem, a means for correcting the Ft curve into a sinusoidal curve by providing a filter member forming a third liquid chamber between the first liquid chamber and the rubber wall is provided. Although it is conceivable to use a steel plate, this would increase the number of parts by the amount of the filler 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 the current is supplied to the coil provided on the stator disposed outside the mover. To excite the coil to electrically drive both the forward and backward strokes, so as to eliminate the delay in the rise of the force F as shown in FIG. be able to. Then, as an example, if a sine wave alternating current is applied to the coil, the Ft curve can be made a sine wave curve corresponding to the sine wave curve representing the relationship between the sine wave alternating current and the current. Therefore, it is not necessary to provide the third liquid chamber as a correction means for converting the Ft curve into a sine wave curve, and the filter member is not required, thereby suppressing an increase in the number of parts. .

The second liquid chamber is formed by providing a diaphragm covering the vibration-proof substrate outside the vibration-proof substrate over the first mounting tool and the second mounting tool, so that the second liquid chamber is formed. In addition to simplifying the formation structure of the rubber member, it is only necessary to connect a rubber wall to the shaft member of the vibration means. The number of parts around the shaft member can be reduced.

In addition, an orifice forming metal that is vulcanized and bonded to the lower end of the vibration-isolating base, a cylindrical metal that is vulcanized and bonded to the lower end of the diaphragm, and an outer peripheral portion in which an annular reinforcing metal of the rubber wall is embedded. The orifice forming metal fitting also serves as a metal fitting for coupling the vibration-proof base and the second fitting to the upper inner periphery of the second fitting by being fixed by press-fitting or fitting means. become. Therefore, the work of assembling the vibration isolating base, the diaphragm, and the rubber wall to the second mounting fixture can be simplified, and the configuration of the orifice for communicating the first liquid chamber and the second liquid chamber can be simplified. And space can be reduced.

In particular, a cylindrical fitting vulcanized and bonded to the lower end of the diaphragm is press-fitted and fixed to the upper inner periphery of the second fitting, and vulcanized and bonded to the lower end of the vibration-proof base and outwardly. In a case where a configuration is adopted in which an annular orifice forming metal member having a circumferential groove shape that opens toward the outside and an outer peripheral portion of the rubber wall are liquid-tightly fitted and fixed to an inner periphery of the cylindrical metal member. The assembling work is easy, and the orifice can be easily formed, and the sealing property can be maintained well. The iron core movable type actuator has a magnetic pole portion in which the stator disposed outside of the mover including the shaft member projects radially inward, and the magnetic pole portion includes: At least one pair of permanent magnets adjacent to each other in the axial direction and having different polarities are arranged, and a coil is wound around the magnetic pole portion, and the magnetomotive force generated by exciting the coil and each of the permanent magnets The shaft member is reciprocated by a combination of the respective magnetomotive forces.

Specifically, as the actuator, a stator attached to the second fixture and a magnetic material portion provided on the outer periphery of the shaft member, and can reciprocate in the axial direction with respect to the stator. Supported in the inner space of the stator A pair of permanent magnets facing the magnetic material portion in a state in which the stator is adjacent to a magnetic pole portion facing the magnetic material portion of the mover in a reciprocating direction of the mover. Magnets are arranged with the magnetic poles in the direction orthogonal to the reciprocating direction reversed so as to form mutually different poles, and a coil capable of generating a magnetic flux passing through the pair of permanent magnets is provided as a magnetic pole of the stator. It shall consist of a configuration wound around the part.

Accordingly, when a current in the positive direction (positive current) flows through the coil, the direction of the magnetomotive force of one of the permanent magnets forming the opposite polarity and the direction of the magnetomotive force of the coil become the same, and the magnetomotive forces of both coils become the same. In other words, the magnetic flux is synthesized, and the direction of the magnetomotive force of the other permanent magnet is opposite to the direction of the magnetomotive force of the coil, so that the magnetic flux of both magnetomotive forces is reduced. As a result, a force in the axial direction on one side acts on the magnetic material portion and the shaft member of the mover, and the shaft member moves to one side in the axial direction. When a current (negative current) flows in the opposite direction to the coil, the direction of the magnetomotive force of the one permanent magnet and the direction of the magnetomotive force of the coil become opposite, and the direction of the magnetomotive force of the other permanent magnet becomes The direction is the same as the direction of the magnetomotive force of the coil. Thus, a force in the axial direction on the other side acts on the magnetic material portion and the shaft member of 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 the forward and reverse directions according to the direction (positive current and negative current) of the current exciting the coil. Therefore, 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 the change in the positive and negative currents.

In addition, the moving magnet is a type of movable core that utilizes a change in the magnetic circuit caused by a combination of the magnetomotive force generated by the coil excitation and the permanent magnets forming the different poles and the respective magnetomotive forces. Higher output is obtained than in the case of the mold.

In particular, the pair of permanent magnets adjacent to each other in the reciprocating direction and having mutually different polarities Are opposed to each other across the magnetic material portion in a direction orthogonal to the reciprocating direction, and the arrangement of the magnetic poles is reversed so that the opposite magnetic poles are different from each other. A stronger magnetomotive force can be generated if the magnetic poles are disposed on the respective magnetic poles of the stator. As a result, a much larger force can be obtained than in the case of the moving magnet type, and thus miniaturization can be easily achieved.

In the active type liquid filled type vibration damping device, the plate member faces the axial direction of the shaft member, and the shaft member is fixed to the stator via a pair of plate panels positioned at intervals in the axial direction. With this configuration, it is possible to prevent frictional resistance from being applied to the shaft member of the mover due to the reciprocating movement, whereby the reciprocating motion of the shaft member becomes smooth.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of the active liquid filled type vibration damping device of the present invention.

FIG. 2 is a schematic explanatory view showing the operation of the actuille.

FIG. 3 is a schematic explanatory view showing the action of the actuary when a current flows in the coil in the positive direction.

FIG. 4 is a schematic explanatory view showing the operation of the actuille.

FIG. 5 is a schematic explanatory view showing the action of the actuary when a current flows through the coil in the reverse direction.

FIG. 6 is a diagram showing the relationship between the force F acting upon the actuation of the active liquid filled type vibration damping device and the time t. '

FIG. 7 is a diagram showing the relationship between the force F applied by the drive of the actuator and the time t of the conventional active liquid filled vibration isolator.

[Best mode for carrying out the invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 shows an active-type liquid-filled vibration damping device (hereinafter referred to as “liquid-filled vibration damping device”) that is assembled as an engine mount on a vehicle.

In this liquid filled type vibration damping device, a first mounting member 1 mounted on an engine and a cylindrical second mounting member 2 mounted on a frame on a vehicle body side are interposed via a vibration insulating base 3 made of a rubber-like elastic material. A disk-shaped rubber wall 5 is provided on the second fixture 2 so as to face the anti-vibration base 3, and a first liquid chamber 4 is formed between the anti-vibration base 3 and the rubber wall 5. ing. A second liquid chamber 6 different from the first liquid chamber 4 is formed outside the vibration-proof base 3 and between the vibration-proof base 3 and the outer peripheral surface 3A of the vibration-proof base 3 so as to cover the vibration-proof base 3. An upper constricted tapered cylindrical diaphragm 7 is provided over the first fitting 1 and the second fitting 2, and the second liquid chamber 6 and the first liquid chamber 4 are connected to the second fitting 2. The orifices 8 are provided along and communicate with each other.

The rubber wall 5, which forms a part of the chamber wall of the first liquid chamber 4, has an electromagnetic linear actuator 9 (hereinafter, referred to as "actuator 9") having a movable iron core as a vibration means. ) Is connected from the side opposite to the first liquid chamber 4, and is provided so as to control the pressure of the first liquid chamber 4 by vibrating and displacing the rubber wall 5. The actuator 9 is provided fixed to the second fixture 2 as described later.

The first mounting member 1 has a lower body 1 a having a substantially T-shaped cylindrical section with a top part projecting radially outward in a flange shape and embedded in the vibration-isolating base 3, and a lower end part in a radial direction. And a cap-shaped upper body 1b that protrudes outward in a flange shape. The lower body 1a has a screw hole 10a which opens upward in the axial center thereof, and the upper body 1b has a through hole 10b continuous with the screw hole 10a in the axial center. Have. The lower body 1a and the upper body 1b are arranged below the upper body 1b with respect to the central upper end 1a1 projecting above the flange-shaped part of the lower body la. The surface-side concave portion 1b1 is fitted in a tight fit, and the two flange-shaped portions are coupled to each other 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 between the two flange-shaped portions and sealed. The first attachment 1 is connected to the engine by screwing a connection bolt (not shown) to the female screw portion 10 through the through hole 10b.

The second fixture 2 includes a lower portion 2a that holds the actuator 9 and an upper portion 2b that has a cylindrical shape larger in diameter than the lower portion that is continuous with the lower portion 2a via an inclined portion 2c. . On the inner periphery of the upper portion 2b above the stepped portion 2c of the second mounting member 2, a cylindrical metal member 11 bonded to the lower end portion 7b of the diaphragm 7 by vulcanization is provided at the upper portion of the second mounting member 2. It is press-fitted and fixed to the inner circumference of 2b. Further, an annular orifice forming metal fitting 12 which is vulcanized and bonded to the lower end of the vibration-isolating base 3 and forms a circumferential concave groove opening radially outward is formed on the inner periphery of the cylindrical metal fitting 11. And an outer peripheral portion 15 in which an outer peripheral portion of the rubber wall 5, in particular, an annular reinforcing bracket 13 is embedded in a pair by vulcanization bonding means, is connected to a lower end portion 7 b of the diaphragm 7. They are fitted in a liquid-tight manner via a rubber layer 16 that is vulcanized and bonded to the cylindrical metal fitting 11, and are fixed in a state in which they are in contact with each other vertically, so that they are assembled as a pair. As a result, the recessed groove portion of the orifice forming bracket 12 is formed as an orifice 8 communicating with the first liquid chamber 4 and the second liquid chamber 6 by the communicating portions 8a and 8b, respectively.

In the case of the figure, after the orifice forming metal fitting 12 and the outer peripheral portion 15 of the rubber wall 5 are fitted to the cylindrical metal fitting 11, the lower end of the cylindrical metal fitting 11 is bent inward, The orifice forming bracket 12 and the outer peripheral portion 15 are held so as not to easily come off.

It is also possible to adopt a configuration in which the orifice forming bracket 12 and the outer peripheral portion 15 of the rubber wall 5 are fitted to the upper portion 2b of the second mounting member 2 in a liquid-tight manner. Can be easily fitted and fixed to the inner periphery of the cylindrical fitting 11 as described above.

For example, the lower body 1 a and the upper body 1 b of the first fixture 1 are joined together in the liquid by connecting the vibration-isolating base 3, the diaphragm 7, and the rubber wall 5, as described above. The orifice forming metal fittings 12 and the outer peripheral part 15 are fitted to the metal fittings 11 and assembled in a state in which liquid is sealed. It can be press-fitted and assembled.

A support bracket 19 is fixed to an outer peripheral portion of the lower portion 2a of the second mounting member 2 by welding means or the like, and a bottom plate 23 is continuously provided on a lower surface of the support bracket 19, A plurality of connection bolts 20 for connecting to the frame on the vehicle body side are fixed to the bottom plate 23. The bottom plate 23 is provided so as to be able to receive the above-mentioned act 9 by an inwardly upwardly convex portion 23a.

The anti-vibration base 3 has a bottom side formed in a hollow truncated cone shape, and an upper end thereof corresponds to the lower body 1 a of the first fixture 1, and a lower end corresponds to the orifice forming bracket 12. It has been vulcanized.

The diaphragm 7 is made of a rubber-like elastic material, and its upper end 7a is vulcanized and bonded to the flange-like portion 1b2 of the upper body 1b of the first fixture 1, and the lower end 7b is It is vulcanized and adhered to the tube fitting 11.

An electromagnet type actuator 9 of a movable iron core, which is a vibrating means of the rubber wall 5, vertically extends a shaft member 27 constituting at least a part of a movable element capable of reciprocating in the axial direction with respect to the stator. It is set in the posture, and a disk-shaped head 26 is formed to protrude at the tip of the shaft member 27. This is embedded and connected to the center of the rubber wall 5 in the vulcanization molding step of the rubber wall 5. I have. By exciting a coil provided on a stator disposed outside the mover as described later, the mover, that is, the shaft member 27 is electrically driven in both forward and backward strokes. To let The actiyue 9 is composed. Next, the structure, operation, and the like of the actuary 9 will be described in detail.

The actuator 9 includes a stator 28 attached to the second fixture 2 and an inner space (shaft center) of the stator 28 which can reciprocate in the axial direction with respect to the stator 28. Supported mover 3.0.

The stator 28 includes a yoke 28 a which is located outside the mover 30 and is formed by stacking a number of annular (mainly rectangular annular) metal plates made of a magnetic metal such as an electromagnetic steel plate. The yoke 28a has magnetic pole portions 29, 29 protruding radially inward from both sides so as to face each other across the mover 30 at the central portion in the axial direction.

The mover 30 is basically a mover iron core formed by laminating a number of metal disks made of the same magnetic metal as described above on the shaft member 27 at the center in the axial direction. The magnetic material portion 30a is fixed.

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 to the outer periphery of the shaft member 27. Has been fixed. As the fixing means, a positioning nut 36a of the shaft member 27 is fitted to engage with the upper stepped portion 27a, and a lower portion thereof, together with the pipe member 37, A pair of upper and lower supporting panel panels 35, 35, which will be described later, and a pair of short pipes 38, 38 that sandwich the panel panels 35, 35 between the panel members, are further fitted. The nut 36 for tightening is screwed into the screw portion 27 b at the end of 7 and fixed by screwing. Numeral 39 denotes a locking nut for preventing the tightening nut 36 from becoming loose.

By adopting such a configuration, the outer peripheral portion 15 of the rubber wall 5 is fitted together with the orifice forming metal fittings 12 and the like to the cylindrical metal fittings 11 and assembled, and the shaft of the movable element 30 is assembled. With only members 2 and 7 connected to rubber wall 5 After this assembling, the positioning nut 36a, the pipe member 37 to which the magnetic material portion 30a is fixed, the plate panels 35, 35, and the short The pipes 38, 38 are fitted together and fastened and fixed by the fastening nuts 36, whereby the mover 30 can be assembled and configured. Then, when the assembled mover 30 is pressed into the upper part 2 b of the second fixture 2, the stator is pressed into the lower part 2 a of the second fixture 2. 28, and is connected to and supported by the stator 28 via the panel panels 35, 35 so as to be able to reciprocate vertically (in the axial direction of the shaft member 27). .

The plate panels 35, 35 are formed in a rectangular ring shape in which a part is inwardly constricted so as to bypass a coil portion described later, and are spaced apart from each other in the up-down direction, and the magnetic material portion 3. It is located with a gap between it and 0a. Each plate spring 35 has its inner peripheral side end sandwiched between the pipe member 37 and the short pipes 38, 38 as described above, and its outer peripheral end The upper and lower case members 40 and 41 are fixed together at the outer peripheral portion of the upper and lower case members by bolts 42 for fastening and fixing the upper and lower case members 40 across the yoke 28a, and are supported so as to be elastically deformable. At the center of the upper and lower case members 40, 41, openings 40a, 41a through which the positioning nut 36a and the fastening nut 36 can pass are provided, and the bottom plate is further provided. An opening 23b through which the nuts 36a and 36 can pass is also formed at the center of the 23 convex portions 23a. Thus, the movable element 30 can be moved up and down without any problem.

As shown in FIGS. 2 to 5, the movable part 30 has magnetic pole parts 29, 29 of the stator 28 opposed to the magnetic material part 30 a. A pair of upper and lower permanent magnets 31 and 32 facing the magnetic material portion 30a are arranged side by side in the reciprocating direction (vertical direction) of the element 30. The magnetic poles are arranged in a direction (horizontal direction) orthogonal to the reciprocating movement direction so that the magnetic poles form NS alternately different poles, and the arrangement of the magnetic poles (N pole and S pole) is reversed. Has been established. 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 member 30a in the vertical direction (axial direction).

A coil 33 is wound around a magnetic pole portion 29 of the stator 28 around an axis in a direction orthogonal to the reciprocating direction (the left-right direction in FIG. 2). It is configured to generate magnetic flux passing through 1, 32.

In the case of the figure, the magnet part 34 composed of the pair of permanent magnets 31 and 32 is connected to the two magnetic pole parts 29 and 29 of the stator 28 opposite to each other with the mover 30 therebetween. The permanent magnets 31, 32 of the magnet portions 34, 34 of the two magnetic pole portions 29, 29, respectively, are provided at the inner end, and the magnetic material portion is perpendicular to the reciprocating direction. The magnetic poles are arranged opposite to each other so that the opposite magnetic poles are opposite to each other with 30a interposed therebetween. Correspondingly, the coil 33 is also wound around the magnetic pole sections 29, 29 in such a manner that it is located on the left and right outer sides of each magnet section 34. 43 is a spool member for holding the coil 33.

As shown in FIGS. 2 and 4, the pair of coils 33, 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 3 1 and 3 2 on the right side has the N pole on the surface facing the magnetic material portion 30 a and the S pole on the opposite surface. The lower permanent magnet 32 has an S pole on the surface facing the magnetic material portion 30a and an N pole on the opposite surface. The upper permanent magnet 31 of the pair of left permanent magnets 3 1 and 3 2 has an S pole on the surface facing the magnetic material portion 30a, an N pole on the opposite side, and a lower permanent magnet 3 2 The N pole is on the side facing the magnetic material portion 30a and the S pole is on the opposite side. In FIGS. 2 and 3, white arrows pointing to the left and right indicate the direction of the magnetomotive force of the permanent magnets 31 and 32. This magnetomotive The force is on the left side on the upper side and on the right side on the lower side.

With the above structure, when the coil 33 is not energized, the magnetic fluxes generated by the permanent magnets 31 and 32 in the left and right magnets 34 and 34 pass through the magnetic material portion 30a facing the two magnets. Short-circuited. Then, as shown in FIG. 3, when a positive current flows through the coil 33, a magnetomotive force is generated in the coil 33 in the direction of the arrow. As a result, the direction of the magnetomotive force of the upper permanent magnet 31 and The direction of the magnetomotive force of the coil 3 3 (arrow in FIG. 3) becomes the same, and the magnetic flux of the magnet is combined to increase the magnetomotive force. On the other hand, the direction of the magnetomotive force of the lower permanent magnet 32 is lower. Then, the directions of the magnetomotive forces of the coils 33 become opposite, and the magnetomotive forces of both are canceled out and weakened. As a result, an upward force (indicated by a white arrow) acts on the magnetic member 30a of the mover 30 and the shaft member 27, and the shaft member 27 is raised.

In addition, as shown in FIG. 5, when a current (negative current) flows in the opposite direction to the coil 33, the direction of the magnetomotive force of the upper permanent magnet 31 and the direction of the coil 33 The direction of the magnetic force is reversed, the magnetic flux is canceled out 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 become the same. The magnetic flux of the magnet is synthesized below the lower side to increase the magnetomotive force. As a result, a downward force (indicated by a white arrow) acts on the magnetic member 30a of the mover 30 and the shaft member 27, and the shaft member 27 descends. By changing the direction of the current of the coil 33 alternately forward and reverse, the shaft member

2 7 reciprocates up and down.

Since the actuator 9 is electrically driven in both the forward stroke and the backward stroke as described above, a sinusoidal alternating current is passed through the coil 33, thereby allowing the axis of the mover 30 to move. The member 27 can be moved up and down in response to the change in the direction of the alternating current. In particular, a pair of permanent magnets 31

The combination of the direction of each magnetomotive force of 32 and the magnetomotive force generated in the coil 33 makes it possible to move the magnet even though it is a relatively compact device. Since a higher output can be obtained than in the case of the G-type, 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, the F—t curve showing the relationship between the force F [N] acting on the liquid-sealed vibration isolator and the time t [s] by driving the actuator 9 is represented by a sine curve. A sinusoidal curve corresponding to the sinusoidal curve representing the relationship between the wave AC currents can be obtained.

The present invention is not limited to an engine mount, but can be used in various ways. For example, the present invention can be applied to a mount provided between a suspension member and a frame on a vehicle body side. For example, the mover 30 may be one in which a magnetic material portion 30a is directly fixed to a shaft member 27 by press-fitting means or the like.

Further, the magnet section 34 may be configured as follows.

Of the pair of upper and lower permanent magnets 3 1 and 3 2 on the right side, the upper permanent magnet 31 has an S pole on the surface facing the magnetic material portion 30a, an N pole on the opposite surface, and a lower permanent magnet. The magnet 32 has an N pole on the side facing the magnetic material portion 30a and an S pole on the opposite side. The upper permanent magnet 31 of the pair of left permanent magnets 3 1, 3 2 has an N pole on the side facing the magnetic material portion 30 a, an S pole on the opposite side, and a lower permanent magnet. Reference numeral 32 denotes an S pole on the side facing the magnetic material portion 30a and an N pole on the opposite side.

[Possibility of industrial use]

INDUSTRIAL APPLICABILITY The present invention can be particularly suitably used for an engine mount as an active type liquid filled type vibration damping device in which the vibration damping effect is enhanced by controlling the pressure of an internal liquid chamber, and can also be used for other mounts. .

Claims

A first attachment and a cylindrical second attachment are connected via a vibration-proof base made of a rubber-like elastic material, and a rubber is attached to the second mount so as to face the vibration-proof base. A first liquid chamber between the vibration-proof substrate and the rubber wall; and a second liquid chamber in which a diaphragm forms a part of the chamber wall separately from the first liquid chamber; The liquid chamber communicates with the second liquid chamber through an orifice, and the rubber wall is vibrated by vibrating means connected to the rubber wall which forms a part of the chamber wall of the first liquid chamber, and the first liquid chamber is vibrated. An active-type liquid-filled vibration damping device configured to control the pressure of a liquid chamber, wherein the vibration-damping base is provided outside the vibration-damping base and over the first attachment and the second attachment. A diaphragm is provided to form a second liquid chamber between the vibration-proof substrate and the vibration-proof substrate.

A cylindrical fitting vulcanized and bonded to a lower end of the diaphragm; an annular orifice forming metal which is vulcanized and bonded to a lower end of the vibration isolating base; and an outer peripheral portion in which an annular reinforcing metal fitting of the rubber wall is embedded. Are fixed to the upper inner periphery of the second mounting fixture by press-fitting or fitting means, respectively, and the orifice forming metal fitting connects the first liquid chamber and the second liquid chamber. To form

'' A movable iron core actuator configured as at least a part of a movable element capable of reciprocating in the axial direction with respect to a stator having a shaft member connected to the rubber wall disposed outside thereof as the vibration means. By exciting a coil provided in the stator, the shaft member is driven in both directions of a forward stroke and a backward stroke to excite the rubber wall. Active type liquid filled type vibration damping device.

A cylindrical fitting vulcanized and bonded to the lower end of the diaphragm is press-fitted and fixed to the upper inner periphery of the second fitting, and the lower end of the vibration-proof base is vulcanized. An annular orifice forming metal member which is sulfur-bonded and forms a circumferential concave groove opening outward and an outer peripheral portion of the rubber wall are liquid-tightly fitted and fixed to an inner peripheral surface of the cylindrical metal member. The active liquid filled type vibration damping device according to claim 1. The actuator has a magnetic pole portion in which the stator disposed outside a mover including the shaft member projects radially inward, and the magnetic pole portion has an axial direction. At least a pair of permanent magnets adjacent to each other and having different polarities are arranged, and a coil is wound around the magnetic pole portion, and the magnetomotive force generated by exciting the coil and the permanent magnet 3. The active liquid filled type vibration damping device according to claim 1, wherein the shaft member is reciprocated by a combination with each magnetomotive force.

The actuator comprises a stator attached to the second mounting member, and a magnetic material portion provided on an outer periphery of the shaft member, and wherein the fixed member is reciprocally movable in the axial direction with respect to the stator. A movable part supported in an inner space of the movable part, wherein the stator is adjacent to a magnetic pole part facing the magnetic material part of the movable part in the reciprocating direction of the movable part. A pair of permanent magnets having mutually different polarities is disposed with the arrangement of the magnetic poles in a direction orthogonal to the reciprocating direction being reversed, and a coil capable of generating a magnetic flux passing through the pair of permanent magnets is provided in the magnetic pole portion. 4. The active liquid filled type vibration damping device according to claim 3, wherein the device is wound around.

The pair of permanent magnets adjacent to each other in the reciprocating direction and having opposite polarities are opposed to each other across the magnetic material portion in a direction orthogonal to the reciprocating direction, and the opposed magnetic poles are opposite polarities to each other. 5. The active liquid-filled type vibration damping device according to claim 4, wherein the arrangement of the magnetic poles is reversed so that the magnetic poles are arranged on the respective magnetic pole portions of the stator facing each other with the mover interposed therebetween.

A plate member faces the axial direction of the mover, and the shaft member of the mover is supported by the stator via a pair of plate panels positioned at intervals in the axial direction. Item 5. An active liquid filled type vibration damping device according to item 4.

A plate member faces the axial direction of the mover, and the shaft member of the mover is supported by the stator via a pair of plate panels positioned at intervals in the axial direction. Item 6. The active liquid filled type vibration damping device according to item 5.