JP2007078168A - Active liquid-sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent intrusion of water and foreign matters to the circumference of a movable element in an active liquid-sealed vibration control device. <P>SOLUTION: In this active liquid-sealed vibration control device comprising an actuator 26 for vibrating and driving a vibration plate 24 as a part of a chamber wall of a first liquid chamber 16, the actuator 26 is composed of a fixed element 54 fixed to a second mounting fixture 12 side and the movable element 56 connected with the vibration plate 24 for vibrating and driving the same, and the fixed element 54 is formed into the annular shape surrounding the outer periphery of the movable element 56 to axially reciprocatably supporting the movable element. A cylindrical extension portion 106 extending toward the fixed element 54 is formed on an annular member 30 connected with a peripheral edge portion of a rubber film portion 46 of the vibration plate 24, a first seal rubber 108 kept into contact with an upper face 54a of the fixed element 54 is mounted in its tip portion 106c, and an inner space 102 with respect to a contact portion 100 with the upper face 54a is sealed to an outer peripheral space 104 of the fixed element. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 generally includes a first fixture, a second fixture, a vibration isolating base made of a rubber-like elastic body connecting them, and the anti-vibration base covering a part of a chamber wall. A first liquid chamber formed; a second liquid chamber formed by a diaphragm having a part of a chamber wall made of a rubber film; an orifice passage communicating the two liquid chambers; and another part of the chamber wall of the first liquid chamber And an actuator that controls the pressure of the first liquid chamber by driving the vibration plate to vibrate. And, 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, vibrations are counterbalanced and spring characteristics are actively changed according to input vibrations Thus, an excellent vibration suppressing effect is obtained by, for example, reducing the mount spring.

  As such an active liquid-filled vibration isolator, the present applicant can simplify the structure, increase the output, reduce the number of parts, and contribute to downsizing. For the purpose of providing a device, a movable iron core actuator is provided in which a shaft member connected to a vibration plate is part of a mover that can reciprocate in the axial direction with respect to the stator, and the stator coil is excited. The shaft member is driven in both the forward stroke and the backward stroke to excite the vibration plate (see Patent Document 1 below).

On the other hand, in a vibration isolator mounted on an automobile, water may enter from the outside during rainy weather or car wash, or foreign substances such as sand, gravel, and dust may enter during driving on rough roads. In order to prevent the entry of such foreign matter, it has been proposed to provide a vibration-proof device with a seal rubber (see Patent Documents 2 and 3 below).
JP 2005-155899 A JP 2004-92757 A JP 2002-81488 A

  In the vibration isolator mounted on the automobile as described above, water and foreign matter may invade, especially in the type equipped with an actuator, if water or foreign matter enters, the mover and coil may be damaged, In particular, in linear actuators where a gap exists between the mover and the stator, foreign matter can enter the gap, causing malfunctions and hindering the smooth movement of the mover. There is a risk of damage.

  The present invention has been made in view of the above, and in an active liquid-filled vibration isolator that is particularly suitable as a vibration isolator for automobiles, it prevents the penetration of water and foreign matter into the mover and coil, and is durable. It aims at providing the thing which is excellent in property.

  An active liquid-filled vibration isolator according to claim 1 of the present invention is a rubber fitting that connects a first fixture, a bottomed cylindrical second fixture, and the first fixture and the second fixture. A vibration isolating base made of an elastic body, a first liquid chamber provided inside the second fixture and forming a part of the chamber wall, and another chamber wall of the first liquid chamber. An active liquid-filled vibration isolator comprising: a vibration plate that forms a portion; and an actuator that is disposed on the opposite side of the first liquid chamber across the vibration plate and drives the vibration plate to vibrate. The actuator includes a stator fixed to the second fixture side, and a mover that is connected to the vibration plate and drives the vibration plate to vibrate. An annular shape surrounding the outer periphery of the mover is supported so that the mover can reciprocate in the axial direction, and the vibration plate is elastic at least at the outer periphery. A rubber film part comprising: a peripheral part of the rubber film part coupled to an annular member; and the vibration plate is attached to the second fixture via the annular member, A cylindrical extending portion extending toward the stator is provided, and a first seal rubber that abuts one end surface in the axial direction of the stator is provided at a distal end portion of the cylindrical extending portion, and the first seal rubber is The one end face of the stator is in contact with the entire periphery, and the space inside the corresponding contact portion is sealed against the outer peripheral space of the stator.

  In this way, the first seal rubber is brought into contact with the axial end surface of the stator over the entire circumference, and the space including the mover inside the contact portion is sealed with respect to the outer peripheral space of the stator. Water and foreign matter can be prevented from entering around the mover. In addition, since the first seal rubber is provided by extending the cylindrical extending portion from the annular member that supports the vibration plate, the seal structure can be achieved without increasing the number of parts and therefore without increasing the number of assembly steps. Can be incorporated.

  An active liquid-filled vibration isolator according to a second aspect of the present invention is configured such that, in the above configuration, the first seal rubber is formed of a rubber-like elastic body that is continuous from the rubber film portion of the vibration plate. In this case, since the first seal rubber can be formed simultaneously with the vulcanization molding of the rubber film portion of the vibration plate, it is not necessary to attach the first seal rubber separately, leading to a reduction in man-hours. Further, since the rubber-like elastic body is formed along the inner peripheral surface of the cylindrical extending portion from the rubber film portion to the first seal rubber, the adhesion area at the peripheral portion of the rubber film portion with respect to the annular member This contributes to the improvement of the durability of the vibration plate.

  An active liquid-filled vibration isolator according to claim 3 has the above-described configuration, wherein the second fixture is a second fixture main body coupled to the vibration isolator base, and a bottomed cylinder that accommodates and holds the actuator. A holding member, and the holding member includes a second cylindrical extending portion extending from a bottom wall portion of the holding member toward the stator, and a tip of the second cylindrical extending portion. A second seal rubber that abuts against the other end surface in the axial direction of the stator is provided at the portion, the second seal rubber abuts over the other end surface of the stator over the entire circumference, The space is sealed with respect to the outer peripheral space of the stator. As a result, the seal rubber is brought into contact with both end faces in the axial direction of the stator, so that the space including the inner movable element can be more reliably sealed against the outer peripheral space of the stator.

  An active liquid-filled vibration isolator according to a fourth aspect of the present invention has the above-described configuration, wherein the mover includes a shaft member coupled to the vibration plate, and a magnetic material portion provided on an outer peripheral surface of the shaft member. The stator has a magnetic pole portion projecting radially inward so as to face the magnetic material portion, and the magnetic pole portion has at least a pair of adjacent poles adjacent to each other in the axial direction. Permanent magnets are arranged, and a coil is mounted around the magnetic pole portion, and the mover is configured by a combination of magnetomotive force generated by excitation of the coil and each magnetomotive force of each permanent magnet. It is configured to reciprocate in the axial direction. By using such an iron core movable actuator, it is possible to eliminate the delay in the rise of the force generated by the reciprocating motion of the mover, and to enable quick and smooth drive control of the mover. Moreover, because of the movable core type, a large output can be obtained without increasing the number of parts and without increasing the outer diameter.

  According to the present invention, the movable element that vibrates and drives the vibration plate that forms a part of the chamber wall of the first liquid chamber, and the stator that supports the movable element so as to reciprocate in the axial direction in the hollow portion. In a liquid-filled vibration isolator using a linear actuator, it is possible to prevent the intrusion of water and foreign objects around the mover, improving durability in an active liquid-filled vibration isolator mounted on automobiles can do.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an active liquid-filled vibration isolator of an embodiment assembled as an engine mount of an automobile, and FIGS. 2 to 5 are diagrams of an actuator used in the vibration isolator.

  The liquid-filled vibration isolator includes an upper first fixture 10 attached to the engine side, a lower second fixture 12 having a bottomed cylindrical shape attached to a frame on the vehicle body side, and both fixtures 10. , 12, a vibration-isolating base 14 made of a rubber-like elastic body, a first liquid chamber 16 in which the vibration-proofing base 14 forms a part of a chamber wall, and a diaphragm 18 in which a part of the chamber wall is made of a rubber film. A formed second liquid chamber 20, an orifice passage 22 for communicating the first liquid chamber 16 and the second liquid chamber 20, a vibration plate 24 forming another part of the chamber wall of the first liquid chamber 16, An actuator 26 that controls the pressure of the first liquid chamber 16 by exciting the vibration plate 24 is provided.

  The first fixture 10 has a flange portion 10a that projects outward in the radial direction, and has a generally coma shape as a whole, and the upper side of the second fixture 12 on the axis L of the second fixture 12. Are spaced apart from each other. The first fixture 10 has a screw hole 10b that opens upward in an axial center portion thereof, and a bolt (not shown) is screwed into the screw hole 10b so as to be connected to the bracket 1 on the engine side. It has become.

  The second fixture 12 includes a cylindrical first tube fitting 28 in which the vibration-proof base 14 is vulcanized and bonded to the inner peripheral portion, and a cylindrical second tube fitting 32 in which the lower end portion of the diaphragm 18 is vulcanized and bonded. And a holding member 34 that accommodates and holds the actuator 26. And the flange 28a which protruded from the lower end part of the 1st cylindrical metal fitting 28, and the flange 34a which protruded from the upper end part of the holding member 34 are in the state which pinched | interposed the outer peripheral edge part 30a of the annular member 30 mentioned later between both The second fixture 12 is integrally formed by overlapping and bending and fixing the flange 32a so that these are wrapped from above with a flange 32a protruding from the lower end of the second tubular fitting 32. .

  The holding member 34 includes a cylindrical upper member 36 having the flange 34a at the upper end and coupled to the second fixture body 27, and a bottomed cylindrical shape in which a stator 54 described later is accommodated and fixed. The side member 40 is integrated, and both of them are integrated by fitting the upper end portion 40 a of the lower member 40 to the upper member 36. A plurality of support brackets 38 are fixed to the side surface of the lower member 40, and connection bolts 42 that are fastened to the frame on the vehicle body side are press-fitted and fixed to the support brackets 38.

  The anti-vibration base 14 has a substantially umbrella shape, and is vulcanized and bonded so that the lower surface side of the first fixture 10 is embedded in the upper end portion thereof. In addition, the vibration isolating base 14 is fixed to the upper side of the second fixture 12, and specifically, the first cylindrical fitting in which the lower end outer peripheral portion of the vibration isolating base 14 is located at the upper end of the second fixture 12. The inner peripheral surface portion of 28 is vulcanized and bonded to the entire periphery.

  The vibration plate 24 has a disk shape and is configured to include a rubber film portion 46 formed of a rubber-like elastic body at least on the outer periphery thereof, and is opposed to the vibration isolation base 14 in the axial direction of the second fixture 12. Is arranged. Specifically, in this embodiment, the vibration plate 24 includes a disk-shaped vibration member 44, an annular rubber film portion 46 vulcanized and bonded to the peripheral portion of the vibration member 44, and the vibration member And a cylindrical coupling portion 48 provided at the center of 44. The peripheral portion of the rubber film portion 46 is vulcanized and bonded to the inner peripheral portion of the rigid annular member 30, whereby the vibration plate 24 is attached to the second fixture 12 via the annular member 30. It is fixed. In addition, as the vibration plate 24, instead of the one shown in FIG. 1, for example, a configuration in which almost the whole is made of a rubber film portion and a rigid coupling portion is embedded in the center can be adopted.

  The diaphragm 18 is provided over the first fixture 10 and the second fixture 12 so as to cover the vibration isolation substrate 14 on the outer peripheral side of the vibration isolation substrate 14. Specifically, the diaphragm 18 has an upper end portion vulcanized and bonded to the ring-shaped metal fitting 50, and a lower end portion vulcanized and bonded to the second cylindrical metal fitting 32. On the lower surface of the ring-shaped metal fitting 50, a sealing ridge 52 is provided over the entire circumference by rubber continuously extending from the diaphragm 18, and the iron ring-shaped metal fitting 50 is attached to the first fitting 10 made of aluminum. When externally fitting and attaching to the upper end portion by press fitting, the protrusion 52 is pressed against the upper surface of the flange portion 10a of the first fixture 10 so that the gap between the ring-shaped metal fitting 50 and the first fixture 10 is reduced. It is configured to seal.

  The first liquid chamber 16 is formed between the lower surface of the vibration isolation base 14 and the upper surface of the vibration plate 24 inside the second fixture 12. Further, the second liquid chamber 20 is formed between the outer peripheral surface of the vibration isolating base 14 and the diaphragm 18. By providing the second liquid chamber 20 on the outer peripheral side of the vibration isolating base 14 in this manner, It is only necessary to connect the vibration plate 24, and the number of parts around the vibration plate and the mover can be reduced. An orifice passage 22 for communicating the first liquid chamber 16 and the second liquid chamber 20 is provided along the circumferential direction of the second fixture 12. More specifically, the lower portion of the first tubular fitting 28 is bent and formed radially inward, so that a groove portion serving as the orifice passage 22 between the second tubular fitting 32 and the outer circumferential side thereof is surrounded. It extends in the direction. The orifice passage 22 has one end in the circumferential direction connected to the first liquid chamber 16 through the first opening 22a, and the other end in the circumferential direction connected to the second liquid chamber 20 through the second opening 22b. ing.

  The actuator 26 is an iron magnet movable type electromagnet type linear actuator, and is disposed on the opposite side of the first liquid chamber 16 with the vibration plate 24 interposed therebetween. The actuator 26 is supported by the stator 54 fixed to the second fixture 12, and is supported so as to reciprocate in the axial direction with respect to the stator 54, and is coupled to the vibration plate 24 to drive the vibration. A mover 56 is provided.

  The mover 56 is arranged in a vertical position along the axis L of the second fixture 12 (coaxially in the example in the figure), and the screw portion 56a at the tip is coupled to the coupling portion 48 of the vibration plate 24 by screwing. And a magnetic material portion 60 as a mover iron core formed by laminating a large number of metal plates made of a magnetic metal such as an electromagnetic steel plate. The magnetic material portion 60 is in the axial direction of the shaft member 58. It is fixed to the outer peripheral surface in the intermediate part.

  The stator 54 has an annular shape surrounding the outer periphery of the mover 56 coaxially, and supports the mover 56 in a hollow portion thereof so as to be capable of reciprocating in the axial direction. Specifically, the stator 54 is opposed to a yoke 62 formed by laminating a large number of annular metal plates made of a magnetic metal such as an electromagnetic steel plate, and the magnetic material portion 60 is opposed to the central portion of the yoke 62. Magnetic pole portions 64 and 64 projecting radially inward from both sides.

  The mover 56 is supported so as to be able to reciprocate in the vertical direction with respect to the stator 54 via leaf springs 66 and 66 which are a pair of upper and lower elastic support members. The leaf spring 66 is formed in the shape of a square deformed ring that is constricted inward so as to bypass a coil portion described later, and is located above and below the magnetic material portion 60.

  In this embodiment, the shaft member 58 of the mover 56 includes a pipe member 58a serving as a spacer that defines the distance between the upper and lower leaf springs 66, 66, and a main body portion 58b inserted through the pipe member 58a. An upper leaf spring 66 is disposed in contact with the upper end of the member 58a, and the upper leaf spring 66 is sandwiched between a ring member 58c fitted on the upper end portion of the main body portion 58b. In addition, the lower plate spring 66 is disposed in contact with the lower end of the pipe member 58a, and the upper and lower plate springs 66, 66 are fastened by tightening the nut 58e via the ring member 58d fitted on the lower end of the main body portion 58b. 66 is fixed in a state of being axially positioned with respect to the mover 56. On the other hand, with respect to the stator 54, the upper and lower leaf springs 66 and 66 are fixed to fastening portions by bolts 67 and 67 that are fastened with the yoke 62 interposed therebetween, and between the yoke 62 and the leaf spring 66. The cylindrical spacer 90 is fixed in a state of being positioned in the axial direction. The stator 54 is fixed to the bottom wall portion 34 b of the holding bracket 34 by the bolt 67.

  The top and bottom ends of the magnetic pole portions 64, 64 of the stator 54 facing the magnetic material portion 60 are arranged in the state adjacent to the reciprocating direction (vertical direction) of the mover 56 and are opposed to the mover 56. A pair of arcuate plate-like permanent magnets 68 and 70 are arranged in a direction perpendicular to the reciprocating direction (left and right direction) so that the magnetic poles are NS alternating different poles, and the magnetic poles of each other The arrangement of (N pole and S pole) is reversed. Note that the length from the upper end of the upper permanent magnet 68 to the lower end of the lower permanent magnet 70 is longer than the length of the magnetic material portion 60 in the vertical direction (axial direction).

  The pair of magnetic pole portions 64 and 64 of the stator 54 are wound around the axes 72 in the direction perpendicular to the reciprocating direction (left and right direction in FIG. 3). 72 and 72 are wound so that magnetic flux passing through the pair of permanent magnets 68 and 70 can be generated. In the case of the figure, a pair of permanent magnets 68 and 70 are provided at the inner end portions of the two magnetic pole portions 64 and 64 of the stator 54 facing each other with the magnetic material portion 60 interposed therebetween. 64 permanent magnets 68 and 70 face each other across the mover 56 in a direction orthogonal to the reciprocating direction, and the arrangement of the magnetic poles is reversed left and right so that the opposing magnetic poles are different from each other. It is arranged.

  As shown in FIG. 3, the pair of coils 72 are connected to each other. As shown in FIGS. 3 and 4, in this embodiment, the upper permanent magnet 68 of the pair of upper and lower permanent magnets 68 and 70 on the right side has an N pole on the side facing the magnetic material portion 60 and an S pole on the opposite side. The lower permanent magnet 70 has a south pole on the surface facing the magnetic material portion 60 and a north pole on the opposite surface. Of the pair of left permanent magnets 68, 70, the upper permanent magnet 68 has an S pole on the surface facing the magnetic material portion 60 and an N pole on the opposite side, and the lower permanent magnet 70 has a magnetic material portion 60. The opposite side is the N pole and the opposite side is the S pole. In FIGS. 3 and 4, white arrows pointing in the left-right direction indicate the direction of the magnetomotive force of the permanent magnets 68 and 70. 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 configuration, when the coil 72 is not energized, the magnetic flux generated by the permanent magnets 68 and 70 in the left and right magnetic pole portions 64 and 64 is short-circuited through the portion of the magnetic material portion 60 that faces both the magnets. As shown in FIG. 4, when a positive current flows through the coil 72, a magnetomotive force in the direction of the arrow is generated in the coil 72. As a result, the direction of the magnetomotive force of the upper permanent magnet 68 and the coil 72 The direction of the magnetomotive force (arrow in FIG. 4) becomes the same, the magnetic fluxes of the magnets are combined to increase the magnetomotive force, while the direction of the magnetomotive force of the lower permanent magnet 70 and the magnetomotive force of the coil 72 are The direction is reversed, and the magnetomotive force of both is canceled and weakened. As a result, an upward force (indicated by a white arrow) acts on the magnetic material portion 60, and the mover 56 rises.

  As shown in FIG. 5, when a reverse current (negative current) flows through the coil 72, the direction of the magnetomotive force of the upper permanent magnet 68 and the direction of the magnetomotive force of the coil 72 are reversed. Are reversed and the magnetomotive force is weakened, and the direction of the magnetomotive force of the lower permanent magnet 70 and the direction of the magnetomotive force of the coil 72 are the same. Combined to increase magnetomotive force. Thereby, a downward force (indicated by a white arrow) acts on the magnetic material portion 60, and the mover 56 is lowered. Then, when the direction of the current of the coil 72 is alternately changed in the forward and reverse directions, the mover 56 reciprocates up and down.

  In the vibration isolator having such a configuration, in the present embodiment, both end surfaces in the axial direction of the stator 54, that is, the upper surface 54a and the lower surface 54b are in contact with each other over the entire circumference, and from the corresponding contact portion 100. Upper and lower sealing means for sealing the inner space 102 with respect to the outer peripheral space 104 of the stator 54 are also provided.

  The upper sealing means that contacts the upper surface 54a of the stator 54 is a cylindrical extension 106 (hereinafter referred to as a first cylindrical extension) extending downward from the inner peripheral end of the annular member 30 toward the stator 54. And a first seal rubber 108 that is provided over the entire circumference and contacts the upper surface 54a of the stator 54. In this embodiment, the first cylindrical extending portion 106 has a straight cylindrical shape in which the upper substantially half 106a is parallel to the axial direction, and the lower substantially half 106b has a reverse tapered tubular shape that spreads downward. The lower end is bent outward in a flange shape, and a first seal rubber 108 is provided on the lower surface of the flange-shaped tip portion 106c. The first seal rubber 108 is formed of a continuous rubber-like elastic body composed of the rubber film portion 46 of the vibration plate 24 and is integrally vulcanized when the rubber film portion 46 is vulcanized. Therefore, the inner peripheral surface of the first cylindrical extending portion 106 between the rubber film portion 46 and the first seal rubber 108 is covered with the rubber layer 110 over the entire periphery. Further, the rubber layer 110 is also formed on the outer peripheral surface of the first cylindrical extending portion 106 so as to extend to an intermediate position in the height direction.

  On the other hand, the lower sealing means that comes into contact with the lower surface 54b of the stator 54 is a second cylindrical extending portion 112 (hereinafter referred to as the second cylindrical extending portion 112) extending upward from the bottom wall portion 34b of the holding member 34 toward the stator 54. And a second seal rubber 114 which is provided at the tip of the second cylindrical extending portion and is in contact with the lower surface 54b of the stator 54. In this embodiment, the second cylindrical extending portion 112 is configured as a side wall of the dish-like member 116 fixed to the bottom wall portion 34b of the holding member 34, and has a reverse tapered cylindrical shape that spreads upward. The tip is bent outward in a flange shape, and a second seal rubber 114 is provided on the flange-like tip 112a. In this example, the second seal rubber 114 is vulcanized and bonded to the second cylindrical extending portion 112. However, a separate seal rubber can be fitted and attached to the distal end portion 112a without being vulcanized and bonded. .

  In consideration of the moldability of these sealing means, in this embodiment, the outer shape of the stator 54 is formed in a circular shape as shown in FIG. 2, so that the first and second sealing rubbers 108 and 114 are used. The seal part (contact part 100) is also configured to be circular. However, the stator 54 may have a rectangular annular shape, and the seal rubbers 108 and 114 may be brought into contact with each other along the outer shape thereof.

  In the actuator 26 of this embodiment, the outer periphery of each coil 72 is covered with a covering 74 formed by molding a synthetic resin in order to prevent water and chemicals from entering the coil 72. That is, the coil 72 is wound around a resin bobbin 76 fitted around the magnetic pole portion 64, and the outer periphery of the coil 72 and the resin bobbin 76 is covered with a synthetic resin covering 74 by molding a synthetic resin. Has been. Then, the pair of coils 72 and 72 molded in this way are integrally connected via a plurality of rod-shaped connecting portions 80 formed simultaneously by the molding as shown in FIG. In addition, a wiring 82 for electrically connecting the coils 72 and 72 to each other is embedded in a part of the connecting portion 80. Thereby, the number of parts can be reduced and the assemblability can be improved. In addition, a connection terminal portion 84 connected to the coil 72 is formed on the lower surface of the cover 74 so as to protrude outward by the molding.

  Since the two coils 72 and 72 are integrally formed in this way, in this embodiment, the stator 54 is composed of two semicircular stator portions 86 and 86 divided in the circumferential direction, and the two are combined. And is configured to form a circular ring surrounding the outer periphery of the mover 56. Each stator portion 86 has the same shape, includes the magnetic pole portion 64 at the center, and is provided with a through hole 88 penetrating in the axial direction at the base portion of the magnetic pole portion 64. Then, when assembling the actuator 26, with the mover 56 disposed between the left and right coils 72, 72 molded integrally, as shown in FIG. The magnetic pole portions 64 and 64 of the pair of stator portions 86 and 86 are inserted into the portion 76a, the coils 72 and 72 are assembled to the stator 54, and then the plate is moved up and down via the cylindrical spacer 90. The springs 66 are overlapped, and the bolt 67 is passed through the through-hole 88 of the stator 54 and the left and right through-holes 92 of the leaf spring and fastened.

  In FIG. 1, reference numeral 120 denotes a packing for the connection terminal portion 84 of the coil 72 and is held around the through hole 122 for exposing the connection terminal portion 84 from the bottom surface of the holding member 34. The space between the bottom surface of the member 34 and the connection terminal portion 84 is sealed.

  Reference numeral 124 denotes a buffer rubber provided at the center of the dish-like member 116 in order to prevent noise due to contact between the lower end of the movable element 56 and the bottom surface of the holding member 34.

  In the liquid-filled vibration isolator of the present embodiment configured as described above, the movable element 56 can be moved up and down by flowing a sinusoidal alternating current through the coil 72 using the movable iron core type actuator 26, and connected to this. The vibration of the first liquid chamber 16 can be controlled by applying a vibration of a sinusoidal curve to the excited vibration plate 24. Further, a combination of the direction of the magnetomotive force of each of the pair of permanent magnets 68 and 70 having different polarities and the magnetomotive force generated in the coil 72 can provide a large output while being a relatively compact device.

  In the present embodiment, the first and second seal rubbers 108 and 114 are brought into contact with and sealed at both end surfaces 54a and 54b in the axial direction of the stator 54. The space 102 is sealed with respect to the outer peripheral space 104 of the stator 54, and water and foreign matter can be prevented from entering around the movable element 56. In particular, in the linear actuator 26, there is a minute gap between the magnetic material part 60 of the mover 56 and the magnetic pole part 64 of the stator 54, and if foreign matter enters the gap, it may cause malfunction. Although there is a risk that the smooth movement of the mover may be hindered, the above-described seal structure can eliminate such problems and improve the durability of the linear actuator 26.

  Further, since the first seal rubber 108 for sealing the upper surface of the stator 54 is provided by using the annular member 30 for fixing the vibration plate 24, a seal structure can be incorporated without increasing the number of parts. it can. Further, by providing the first seal rubber 108 using a rubber-like elastic body that forms the rubber film portion 46 of the vibration plate 24, the first seal rubber 108 is also formed at the same time as the vibration plate 24 is vulcanized. it can. In addition, the rubber layer 110 vulcanized and bonded to the inner peripheral surface of the first tubular extending portion 106 can secure a large adhesion area of the rubber film portion 46 to the annular member 30, thereby improving the durability of the vibration plate 24. Can be improved.

  The present invention is not limited to an engine mount and can be used in various ways. For example, the present invention can also be applied to a mount provided between a suspension member and a vehicle body side frame. Further, the main body structure of the liquid-filled vibration isolator is not limited to the structure shown in the figure, and various modifications can be made.

1 is a longitudinal sectional view of an active liquid-filled vibration isolator according to an embodiment of the present invention. An exploded perspective view of the actuator of the vibration isolator Schematic explanatory diagram showing the action of the actuator Schematic explanatory diagram showing the action of the actuator when a current is passed through the coil in the positive direction Schematic explanatory diagram showing the action of the actuator when a current is passed through the coil in the reverse direction

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st fixture, 12 ... 2nd fixture, 14 ... Vibration-proof base | substrate, 16 ... 1st liquid chamber, 24 ... Excitation board, 26 ... Actuator, 27 ... 2nd fixture main body, 30 ... Ring member, 34 ... Holding member, 34b ... Bottom wall part, 46 ... Rubber film part, 54 ... Stator, 54a ... Upper surface (one end face of the stator), 54b ... (the other end face of the stator), 56 ... Movable element, 58 ... shaft member, 60 ... magnetic material part, 64 ... magnetic pole part, 68, 70 ... permanent magnet, 72 ... coil, 100 ... abutting part, 102 ... inner space, 104 ... outer peripheral space, 106 ... cylindrical extension Part (first cylindrical extension part), 106c ... tip part, 108 ... first seal rubber, 112 ... second cylindrical extension part (second cylindrical extension part), 112a ... tip part, 114 ... first 2 seal rubber

Claims (4)

A first fixture, a bottomed cylindrical second fixture, a vibration-proof base made of a rubber-like elastic body connecting the first fixture and the second fixture, and an inner side of the second fixture A first liquid chamber in which the vibration isolating base forms a part of the chamber wall, a vibration plate that forms another part of the chamber wall of the first liquid chamber, and the first vibration plate sandwiching the vibration plate. An active liquid-filled vibration isolator comprising an actuator disposed on the opposite side of the liquid chamber and driving the vibration plate,
The actuator includes a stator fixed to the second fixture side, and a mover connected to the vibration plate to drive the vibration plate, and the stator is movable. Forming an annular shape that surrounds the outer periphery of the child, and supporting the mover in a reciprocating manner in the axial direction;
The vibration plate includes a rubber film portion made of a rubber-like elastic body at least on an outer peripheral portion, and a peripheral edge portion of the rubber film portion is coupled to an annular member, and the vibration plate is connected to the second member via the annular member. Attached to the fixture,
The annular member includes a cylindrical extending portion extending toward the stator, and a first seal rubber that contacts one end surface in the axial direction of the stator is provided at a distal end portion of the cylindrical extending portion, An active liquid-sealed type wherein the first seal rubber is in contact with the one end face of the stator over the entire circumference, and the space inside the corresponding contact portion is sealed against the outer peripheral space of the stator. Anti-vibration device.   The active liquid-filled vibration isolator according to claim 1, wherein the first seal rubber is formed of a rubber-like elastic body continuous from the rubber film portion of the vibration plate.   The second fixture includes a second fixture body coupled to the vibration-proof base and a bottomed cylindrical holding member that houses and holds the actuator, and the holding member is a bottom wall of the holding member. A second cylindrical extending portion extending from the portion toward the stator, and a second seal rubber that contacts the other end surface in the axial direction of the stator at the tip of the second cylindrical extending portion The second seal rubber is provided in contact with the other end surface of the stator over the entire circumference, and a space inside the corresponding contact portion is sealed with respect to the outer peripheral space of the stator. Item 2. An active liquid-filled vibration isolator according to Item 1. The mover includes a shaft member connected to the vibration plate, and a magnetic material portion provided on an outer peripheral surface of the shaft member,
The stator has a magnetic pole portion projecting radially inward so as to face the magnetic material portion, and the magnetic pole portion has at least a pair of permanent magnets adjacent to each other in the axial direction and having different polarities. And a coil is mounted around the magnetic pole portion, and the mover is moved in the axial direction by a combination of a magnetomotive force generated by excitation of the coil and a magnetomotive force of each permanent magnet. The active liquid-filled vibration damping device according to claim 1, wherein the vibration damping device is configured to reciprocate.

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