JP2010043702A - Liquid-sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assembling workability of an active liquid-sealed vibration control device. <P>SOLUTION: This vibration control device is so configured that a vibration plate 18 forming a part of the chamber wall of a first liquid chamber 16 is vibrated and driven by an actuator 20. In the vibration control device, a second fixture 12 is composed of a tubular member 28 having liquid chambers 16, 24 in its inside, and a bowl-shaped member 30 storing the actuator 20 in its inside, and the opening end 28A of the tubular member is provided with a first flange 68 and a fitting tube 70 extending from the end of the first flange and fitting and holding the mounting member 40 of a diaphragm 22 on its inside. The opening end 30A of the bowl-shaped member is provided with a second flange 72, and a caulking tube 74 extending from the end of the second flange. A rubber sealant 76 is provided on the outer peripheral surface of the mounting member 40, and the mounting member is fitted and press-fitted into the fitting tube through the sealant so as to perform temporary fastening. The temporarily fastened fitting tube 70 is placed on the second flange 72 and caulkingly fixed to be surrounded by the caulking tube 74. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator, and, for example, relates to an active liquid-filled vibration isolator that can enhance the vibration-proof effect by controlling the pressure of an internal liquid chamber.

  2. Description of the Related Art Conventionally, in an anti-vibration device used, for example, as an engine mount of an automobile, an active liquid configured such that a part of a chamber wall of a liquid chamber is formed by a vibration plate, and the vibration plate is driven by an actuator. An enclosed vibration isolator is known (see Patent Document 1 below). In an active liquid-filled vibration isolator, the pressure of the liquid chamber is controlled via an actuator to counteract vibrations or to positively change the spring characteristics in response to input vibrations. An excellent vibration suppression effect has been achieved, for example, by using a low dynamic spring.

  FIG. 11 is a cross-sectional view showing an example of a conventional active liquid-filled vibration isolator. In this vibration isolator, an upper first fixture 101, a lower second fixture 102, a vibration isolating base 103 made of a rubber-like elastic body connecting them, and the anti-vibration base 103 are provided on the chamber wall. A first liquid chamber 104 forming a part, a second liquid chamber 106 formed by a diaphragm 105 having a part of a chamber wall made of a rubber film, an orifice passage 107 communicating the two liquid chambers 104, 106, A vibration plate 108 that forms another part of the chamber wall of the liquid chamber 104 and an actuator 109 that controls the pressure of the first liquid chamber 104 by exciting the vibration plate 108 are configured. .

  The actuator 109 includes a movable shaft 110 connected to the vibration plate 108 and a stator 111 fixed to the second fixture 102 side. By exciting the coil 112 of the stator 111, the movable shaft 110 is provided. 110 is configured to reciprocate in the axial direction (vertical direction), thereby vibrating the vibration plate 108.

The second fixture 102 includes a cylindrical member 113 having the first liquid chamber 104 on the inner side and a bottomed cylindrical hook-shaped member 114 that houses the actuator 109 on the inner side. It is connected by caulking and fixing.
JP 2007-85407 A

  When manufacturing the vibration isolator as described above, the diaphragm 105 and the vibration plate 108 are assembled in a liquid tank to the main rubber formed by integrally vulcanizing the first fixture 101 and the vibration isolating base 103. As a result, a vibration isolator main body having the liquid enclosure chambers 104 and 106 is assembled. Next, the actuator 109 and the hook-shaped member 114 of the second fixture 102 are assembled in the atmosphere.

  In this case, if the liquid remains on the surface of the vibration plate 108 to which the actuator 109 is attached, the actuator 109 may be damaged due to a short circuit or the like, so the liquid adhering to the surface of the vibration isolator body is removed. It must be assembled afterwards.

  As an operation for removing the liquid, for example, air may be blown. At this time, it is necessary to seal the liquid from the liquid enclosure chambers 104 and 106 so that the liquid does not leak. Therefore, in the example shown in FIG. 11, the bowl-shaped member 114 is divided into upper and lower parts 114 </ b> A and 114 </ b> B, and the upper member 114 </ b> A is taken out from the liquid tank and then caulked and fixed together with the cylindrical member 113. 106 are sealed. Then, after the attached liquid is removed, the lower member 114 </ b> B is attached together with the actuator 109.

  However, in the configuration in which the hook-shaped member 114 is divided into two parts in this way, the number of parts is increased, and the caulking and fixing work after removal from the liquid tank and the subsequent connecting and integrating work of the hook-shaped member 114 are required. And man-hours increase. Further, the work of externally fitting the lower member 114B to the upper member 114A has a problem that it is difficult to mount due to dimensional variations between the two members, or the adhesion between the two members is impaired. The inside of the bowl-shaped member 114 is practically required to be sealed in order to prevent water and foreign matter from entering the actuator 109 from the outside, but it is difficult to meet this requirement with the conventional structure.

  The present invention has been made in view of the above, and an object of the present invention is to provide a liquid-filled vibration isolator having excellent assembly workability and excellent airtightness in an actuator housing space.

The liquid-filled vibration isolator according to the present invention includes a first fixture, a cylindrical second fixture, and a rubber-like elastic body that connects the first fixture and the second fixture. A liquid sealing chamber is provided between the base and the second vibration fixture in a state facing the vibration isolation base in the axial direction of the second fixture, and between the vibration isolation base and the second fixture. A liquid chamber forming member to be formed, and an actuator arranged on the opposite side of the liquid sealing chamber with the liquid chamber forming member interposed therebetween, and a movable shaft connected to the liquid chamber forming member,
The liquid chamber forming member has a ring-shaped mounting member fixed to the second mounting tool on an outer peripheral portion,
The second fixture is formed by caulking and fixing a cylindrical member having the liquid enclosure chamber therein and a hook-shaped member that accommodates the actuator in the opening ends of the two,
An opening end portion of the cylindrical member projects outwardly in a direction perpendicular to the axis, and a mounting member for the liquid chamber forming member is extended axially outward from the tip of the first flange portion. It consists of a fitting cylinder that fits and holds inside,
The opening end portion of the flange-shaped member includes a second flange portion projecting outward in a direction perpendicular to the axis, and a caulking tube portion extending outward in the axial direction from the tip of the second flange portion,
A sealing material made of a rubber-like elastic body is provided on the outer peripheral surface of the mounting member or the inner peripheral surface of the fitting tube portion, and the mounting member is fitted to the fitting tube portion via the sealing material. The fitting cylinder part into which the mounting member is fitted is placed on the second flange part of the hook-like member, the actuator is accommodated in the hook-like member, and the movable shaft is moved to the liquid In the state of being connected to the chamber forming member, it is fixed by caulking so that the opening end of the cylindrical member is wrapped by the caulking cylinder.

  According to the above configuration, the attachment member of the liquid chamber forming member is press-fitted into the fitting cylinder portion of the cylindrical member via the sealing material so that the attachment member is fitted into the fitting cylinder portion. Since it is held, the liquid chamber forming member can be temporarily fixed to the cylindrical member while maintaining the sealing property of the liquid sealing chamber. Therefore, the liquid adhering to the surface of the vibration isolator body can be removed by blowing air in the temporarily fixed state, and the assembly workability is excellent. Thereafter, the opening end of the tubular member is caulked and fixed by the caulking tube portion of the opening end of the rod-shaped member in a state where the actuator is accommodated in the rod-shaped member and the movable shaft is connected to the liquid chamber forming member. Since it is finally fixed by caulking in this way, the sealing property of the liquid sealing chamber in the product state can be ensured, and the sealing property of the actuator housing space can be easily improved.

  In the vibration isolator, the liquid chamber forming member is a diaphragm made of a rubber elastic film, and the rubber elastic support is provided between the vibration isolator base and the diaphragm so as to face the vibration isolator base in the axial direction. A vibration plate coupled to the second fixture side through a portion, and the liquid enclosure chamber includes the first liquid chamber in which the vibration isolation plate forms a part of a chamber wall by the vibration plate. The diaphragm forms a part of a chamber wall and is divided into a second liquid chamber communicated with the first liquid chamber via an orifice passage, and the movable shaft penetrates the diaphragm in the state of passing through the diaphragm. The vibration plate may be coupled to the diaphragm and coupled to the vibration plate to drive the vibration plate in the axial direction.

  The actuator includes an annular stator housed in the bowl-shaped member, and the movable shaft supported so as to be capable of reciprocating in the axial direction at a central portion of the stator. Is held in a suspended state in the bowl-shaped member, and the holding plate is connected to the upper surface of the stator via spacers provided at a plurality of locations in the circumferential direction, and the outer periphery of the holding plate An end portion may be superposed on the second flange portion and may be caulked and fixed by the caulking tube portion together with the open end portion of the tubular member.

  Thus, by holding the actuator in a suspended state in the hook-shaped member via the holding plate, the actuator can be fixed at a predetermined position in the hook-shaped member by the caulking. At that time, since the upper surface of the actuator is uneven due to the presence of a coil, a leaf spring, etc., the shape of the holding plate can be made flat over the entire circumference by connecting to the upper surface of the stator via a spacer. It is easy to mold the holding plate.

  In the vibration isolator, the movable shaft includes a shaft member that is a coupling portion with respect to the diaphragm, and the diaphragm is integrally formed on the shaft member, and a stoppered portion that protrudes outward in a direction perpendicular to the axis. And the holding plate is provided so as to partition the diaphragm from the accommodating space of the actuator in the bowl-shaped member, and has an opening through which the movable shaft passes, and the movable shaft A stopper portion that restricts the displacement when the stopper portion hits due to the displacement in the axial direction may be provided in the opening.

  In this case, when the movable shaft is displaced in the axial direction due to an excessive input in the axial direction, the stopper portion provided on the movable shaft side hits the stopper portion provided on the second fixture side so that the displacement is within a certain range. It is possible to limit the actuator inside, and damage to the actuator can be prevented. In addition, since the stopper portion is provided on the shaft member integrally formed with the diaphragm, the stopper portion can be provided without increasing the number of parts. Further, since the stopper plate is provided on the holding plate for holding the actuator, the stopper portion can be provided without increasing the number of parts. Further, since the diaphragm is partitioned from the accommodating space of the actuator by the holding plate, it is possible to prevent the diaphragm from coming into direct contact with the heated actuator when the diaphragm swells to the actuator side due to the flow of the liquid. Therefore, it is possible to prevent the diaphragm from aged due to heat and to improve the durability of the diaphragm.

  In the vibration isolator of the present invention, the actuator is supported by the annular stator housed in the bowl-shaped member, and reciprocally supported in the axial direction at the center of the stator, and the liquid chamber A movable plate connected to a forming member, and a holding plate for holding the actuator in a suspended state in the bowl-shaped member, wherein the holding plate is provided at a plurality of locations in the circumferential direction. The outer peripheral end portion of the holding plate is overlapped on the second flange portion and is caulked and fixed by the caulking cylinder portion together with the opening end portion of the cylindrical member. Also good. Thus, by holding the actuator in a suspended state in the hook-shaped member via the holding plate, the actuator can be fixed at a predetermined position in the hook-shaped member by the caulking. At that time, since the upper surface of the actuator is uneven due to the presence of a coil, a leaf spring, etc., the shape of the holding plate can be made flat over the entire circumference by connecting to the upper surface of the stator via a spacer. It is easy to mold the holding plate.

  With the liquid-filled vibration isolator of the present invention, the assembly workability is excellent, and a sealed structure of the actuator housing space can be easily obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of an active liquid-filled vibration isolator according to a first embodiment assembled as an engine mount of an automobile. 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 isolating base 14 forms a part of the chamber wall, and another part of the chamber wall of the first liquid chamber 16. A vibration plate 18, an actuator 20 that drives the vibration plate 18 to control the pressure of the first liquid chamber 16, and a diaphragm 22 having a chamber wall partially made of a rubber film. A two-liquid chamber 24 and an orifice passage 26 for communicating the first liquid chamber 16 and the second liquid chamber 24 are provided.

  The first fixture 10 is a metal fitting that has a flange portion 10 </ b> A projecting radially outward at the upper end portion and is formed in a substantially truncated cone shape that tapers toward the lower end, and the axis L of the second fixture 12. The upper part of the second fixture 12 is spaced apart from the upper part. The first fixture 10 has a screw hole 10B on its upper surface, and a bolt (not shown) is screwed into the screw hole 10B so as to be connected to a bracket (not shown) on the engine side. .

  The second fixture 12 includes a cylindrical metal member 28 having a vibration-proof base 14 vulcanized and bonded to the inner periphery thereof, and a bottomed cylindrical metal member 30 having an actuator 20. It consists of. Both members 28 and 30 are connected and integrated by caulking and fixing an opening end portion 28A at the lower end of the cylindrical member 28 and an opening end portion 30A at the upper end of the flange-shaped member 30. A connecting bolt 32 projects downward from the bottom of the bowl-shaped member 30 and is configured to be connected to a vehicle body side frame (not shown) by the connecting bolt 32.

  The anti-vibration base 14 has a substantially umbrella shape that extends outward in the direction perpendicular to the axis toward the lower side, and is vulcanized and bonded to the upper end of the lower surface of the first fixture 10. Further, the vibration isolating base 14 is fixed to the upper opening side of the second fixture 12. Specifically, the lower end outer peripheral portion of the vibration isolating base 14 is on the entire circumference of the upper inner peripheral surface of the tubular member 28. It is vulcanized and bonded.

  The vibration plate 18 is a disk-shaped metal member, and is disposed between the vibration isolation base 14 and the diaphragm 22 so as to face the vibration isolation base 14 in the axial direction X of the second fixture 12. The vibration plate 18 is connected to the second fixture 12 side through an annular rubber-like elastic support portion 34 that surrounds the vibration plate 18. More specifically, a metal annular member 38 is fitted to the inner periphery of the second fixture 12 via a seal rubber layer 36 continuous from the vibration isolation base 14. The rubber-like elastic support portion 34 has an outer peripheral portion vulcanized and bonded to the inner peripheral portion of the annular member 38, and an inner peripheral portion is vulcanized and bonded to the outer peripheral portion of the vibration plate 18. The vibration plate 18 is supported by the second fixture 12 via a rubber-like elastic support portion 34.

  The diaphragm 22 is provided so as to be connected to the second fixture 12 on the opposite side of the first liquid chamber 16 with the vibration plate 18 interposed therebetween, and in the axial direction X of the second fixture 12, It is arranged to face the vibration plate 18. The diaphragm 22 is a diaphragm-like liquid chamber forming member that forms a liquid sealing chamber (that is, the first liquid chamber 16 and the second liquid chamber 24) with the antivibration base 14 inside the second fixture 12. is there. The diaphragm 22 has a ring-shaped metal attachment member 40 fixed to the second attachment 12 on the outer peripheral portion thereof.

  The first liquid chamber 16 is a main liquid chamber (pressure receiving chamber) formed between the lower surface of the vibration isolation base 14 and the upper surface of the vibration plate 18 inside the second fixture 12. The second liquid chamber 24 is a sub liquid chamber (equilibrium chamber) that is provided between the vibration plate 18 and the diaphragm 22, and the vibration plate 18 and the diaphragm 22 form part of the chamber wall. Therefore, both the liquid chambers 16 and 24 are partitioned vertically by the vibration plate 18, that is, the vibration plate 18 functions as a partition wall that partitions both the liquid chambers 16 and 24 in the axial direction X. Both liquid chambers 16 and 24 are provided inside the cylindrical member 28.

  The orifice passage 26 that allows the first liquid chamber 16 and the second liquid chamber 24 to communicate with each other is formed by an orifice forming member 42 that is fitted to the inner peripheral surface of the second fixture 12 via the seal rubber layer 36. 12 are provided along the circumferential direction. The orifice forming member 42 is an annular member having a U-shaped cross section that is opened outward, and an axial direction X between the annular member 38 on the outer periphery of the vibration plate 18 and the mounting member 40 on the outer periphery of the diaphragm 22. Is sandwiched between.

  The actuator 20 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 18 interposed therebetween. More specifically, an actuator housing space 44 is provided on the side opposite to the second liquid chamber 24 across the diaphragm 22, and the actuator 20 is housed and held in the housing space 44. The actuator housing space 44 is provided in a state of being sealed from the outside.

  The actuator 20 is fixed to the second fixture 12 in the hook-shaped member 30 and is supported so as to be able to reciprocate with respect to the stator 46 and connected to the vibration plate 18. And a movable shaft 48 as a mover for exciting and driving. As the actuator 20 itself, one having the same configuration as that described in Patent Document 1 can be used.

  The movable shaft 48 is arranged in a vertical posture along the axis L of the second fixture 12 (coaxially in the example in the figure), and its tip 48A is vertically coupled to the central portion of the vibration plate 18. Thus, the vibration plate 18 is configured to vibrate in the axial direction X.

  Specifically, by arranging the vibration plate 18 inside the diaphragm 22, the movable shaft 48 is coupled to the diaphragm 22 in a state of passing through the diaphragm 22, and its distal end portion 48 </ b> A is attached to the vibration plate 18. It is connected. The movable shaft 48 has a shaft member 50 as a coupling portion to the diaphragm 22 on the shaft center L, and the diaphragm 22 is integrally vulcanized on the outer peripheral surface of the shaft member 50. The shaft member 50 is connected and fixed to the upper end portion of the lower movable shaft main body 51 surrounded by the stator 46 by a bolt 52. Further, the upper end portion of the shaft member 50 is fastened and fixed to the lower surface of the vibration plate 18 with a bolt 53.

  On the outer peripheral surface of the movable shaft 48, a magnetic material portion 54 is fixed as a mover core formed by laminating a large number of metal plates made of a magnetic metal such as an electromagnetic steel plate. Although only one magnetic material portion 54 can be provided as in the above-mentioned Patent Document 1, in this example, a plurality (two in the figure) are provided apart from each other in the axial direction X. The movable shaft 48 is reciprocally movable in the axial direction (vertical direction) X with respect to the stator 46 via a leaf spring 56 that is a pair of upper and lower elastic support members, and is positioned in the axial direction X. It is supported by.

  The stator 46 has an annular shape that surrounds the outer periphery of the movable shaft 48 coaxially, and supports the movable shaft 48 so as to reciprocate in the axial direction X in the hollow portion. The stator 46 is formed in a radial direction from both sides so that a yoke 58 formed by laminating a plurality of annular metal plates made of a magnetic metal such as an electromagnetic steel plate and the central portion of the yoke 58 are opposed to each other with the magnetic material portion 54 interposed therebetween. It has a pair of magnetic pole portions 60 projecting inward.

  A pair of upper and lower surfaces facing the movable shaft 48 are arranged adjacent to the tip or inner end of the magnetic pole portion 60 of the stator 46 facing the magnetic material portion 54 in a state adjacent to the reciprocating direction (vertical direction) of the movable shaft 48. The permanent magnets 62 and 64 having an arc plate shape are arranged in a direction (left-right direction) perpendicular to the reciprocating direction so that the magnetic poles are NS different from each other. The poles and the S poles) are arranged in a reverse order. In this example, two pairs of upper and lower permanent magnets 62 and 64 are provided side by side in the axial direction X so as to correspond to the magnetic material portion 54.

  A pair of magnetic pole portions 60 of the stator 46 are wound around the respective coils 66, that is, around the axis in the direction perpendicular to the reciprocating direction, and the pair of permanent magnets 62, The magnetic flux passing through 64 can be generated. In this example, a pair of permanent magnets 62 and 64 are provided at the inner end portions of the pair of magnetic pole portions 60 of the stator 46 facing each other with the magnetic material portion 54 interposed therebetween, and the permanent magnets of each of the magnetic pole portions 60 are provided. 62 and 64 are opposed to each other across the movable shaft 48 in a direction orthogonal to the reciprocating direction, and the magnetic poles are arranged so that the opposing magnetic poles are different from each other so that the opposing magnetic poles are different from each other. .

  As a result, when a positive current flows through the coil 66, the direction of the magnetomotive force generated in the coil 66 and the direction of the magnetomotive force of the upper permanent magnet 62 become the same in the actuator 20, and the magnetomotive force increases. On the other hand, the direction of the magnetomotive force of the lower permanent magnet 64 and the direction of the magnetomotive force of the coil 66 are reversed, and the magnetomotive force of both is canceled and weakened. As a result, an upward force acts on the magnetic material portion 54 and the movable shaft 48 rises. Further, when a current in the reverse direction flows through the coil 66, a downward force acts on the magnetic material portion 54 and the movable shaft 48 descends, contrary to the above. Therefore, when the direction of the current of the coil 66 is alternately changed in the forward and reverse directions, the movable shaft 48 reciprocates up and down.

  In the embodiment having the above configuration, in the present embodiment, as shown in FIG. 4, the first flange portion in which the opening end portion (lower end portion) 28A of the cylindrical member 28 projects outward Y1 in the direction perpendicular to the axis. 68 and a fitting tube portion 70 extending axially outward (ie, downward X1) from the tip of the first flange portion 68. The first flange portion 68 has a ring plate shape that protrudes like a bowl over the entire circumference. The fitting cylinder part 70 is a short cylindrical part bent downward X1 from the outer peripheral end of the first flange part 68 to the entire circumference, and the attachment member 40 of the diaphragm 22 is fitted and held inside thereof. It is configured. As shown in FIG. 4, the protruding height of the fitting tube portion 70 is set to the same dimension as the thickness of the mounting member 40. Note that the thickness of the mounting member 40 is set larger than the thickness of a general diaphragm mounting bracket in order to lengthen the fitting margin with the fitting cylinder portion 70 and secure the sealing performance at the time of temporary fixing described later. Has been.

  An opening end portion (upper end portion) 30A of the bowl-shaped member 30 has a second flange portion 72 projecting outward in the direction perpendicular to the axis Y1 and outward in the axial direction (ie, upward X2) from the tip of the second flange portion 72. It is comprised with the cylinder part 74 for crimping extended. The second flange portion 72 has a ring plate shape that protrudes like a bowl over the entire circumference. The caulking tube portion 74 is a cylindrical portion that rises upward X2 from the outer peripheral end of the second flange portion 72 over the entire circumference, and is configured such that the fitting tube portion 70 is fitted inside the caulking tube portion 74. Yes.

  On the outer peripheral surface of the mounting member 40, a sealing material 76 made of a rubber-like elastic body is fixed by vulcanization bonding over the entire circumference. The sealing material 76 can be molded at the same time when the diaphragm 22 is vulcanized. The attachment member 40 is press-fitted into the fitting cylinder portion 70 in a state of being fitted via the sealing material 76.

  Specifically, the mounting member 40 is set to have a smaller diameter than the fitting cylinder portion 70 so that the assembly workability when the diaphragm 22 is inserted into the cylindrical member 28 in the liquid tank is not reduced. A gap 78 is secured between them, and this gap 78 is sealed with a sealing material 76. The sealing material 76 has a mountain shape having a ridge 76 </ b> A at the center in the axial direction X in the cross-sectional shape shown in FIG. 4, and the extent to which this ridge 76 </ b> A is crushed by compression with the fitting cylinder 70. It is set to the dimension relation.

  The fitting cylinder part 70 fitted with the attachment member 40 in this way is placed on the second flange part 72 of the flange-like member 30 and wraps the opening end part 28 </ b> A of the cylindrical member 28 by the caulking cylinder part 74. The cylindrical member 28 and the hook-shaped member 30 are connected by caulking and fixing in this manner.

  Further, in the present embodiment, as shown in FIG. 1, the actuator 20 is held in a suspended state in the bowl-shaped member 30 by a ring-shaped metal holding plate 80. The holding plate 80 is connected to the upper surface of the stator 46 through columnar spacers 82 provided at a plurality of locations in the circumferential direction C (see FIG. 5).

  As shown in FIG. 5, the spacers 82 are disposed at two locations in the circumferential direction C (two locations facing each other across the axis L), avoiding the leaf spring 56, and their heads are provided on the holding plate 80. It is fixed in a state of being fitted into the formed through hole. The stator 46 is fixed to the lower surface of the spacer 82 by a bolt 84 that passes through the stator 46 in the axial direction X, and is connected to the holding plate 80 via the spacer 82.

  Then, the outer peripheral end portion 80A of the holding plate 80 is superposed on the second flange portion 72, and is fixed by caulking by the caulking tube portion 74 together with the open end portion 28A of the tubular member 28 superimposed thereon. Has been.

  In the caulking fixing portion formed in this way, the opening end portion 28A of the cylindrical member 28 in which the mounting member 40 is fitted and the outer peripheral end portion 80A of the holding plate 80 are connected to the second flange portion 72 of the flange-shaped member 30. Further, it is sandwiched in the axial direction X with the bent portion 74A at the tip of the caulking cylinder portion 74 bent inward in the direction perpendicular to the axis. At that time, the sealing material 76 seals between the outer peripheral surface of the mounting member 40 and the inner peripheral surface of the fitting cylinder portion 70, and is not interposed between the rigid body parts sandwiched in the axial direction X. Further, loosening of the caulking fixing portion due to the sag of the sealing material 76 over time can be prevented.

  The liquid filled type vibration damping device of the present embodiment configured as described above is manufactured as follows.

  First, as shown in FIG. 2, the vibration plate 18, the orifice forming member 42, and the vulcanized molded body composed of the first fixture 10, the tubular member 28, and the vibration isolation base 14 are placed in the liquid tank. The diaphragm 22 is inserted. These three members 18, 22 and 42 are assembled in advance by fixing the shaft member 50 at the center of the diaphragm 22 to the vibration plate 18 with a bolt 53. The diaphragm 22 is assembled to the vulcanized molded body by press-fitting the mounting member 40 on the outer peripheral portion thereof into the fitting cylindrical portion 70 of the cylindrical member 28, whereby the liquid sealing chamber 16 is placed inside the cylindrical member 28. 24 are kept sealed.

  The anti-vibration device main body thus manufactured then removes the liquid adhering to the surface, particularly the surface of the diaphragm 22 by blowing air in the atmosphere. After that, as shown in FIG. 3, the holding plate 80 is covered, and the movable shaft main body 51 of the actuator 20 is fixed to the shaft member 50 on the diaphragm 22 side using the bolt 52, and the movable shaft 48 is attached to the vibration plate 18. And the stator 46 is fixed to the holding plate 80 using bolts 84. Thereafter, the hook-shaped member 30 is covered from below, so that the actuator 20 is accommodated in the hook-shaped member 30 and the movable shaft 48 is connected to the diaphragm 22 and the vibration plate 18 by the caulking tube portion 74. The liquid-filled vibration isolator is assembled by caulking and fixing the open end 28A of the member 28.

  In the liquid-filled vibration isolator of the present embodiment configured as described above, when a large-amplitude low-frequency vibration occurs, the liquid passes through the orifice passage 26 and is between the first liquid chamber 16 and the second liquid chamber 24. The vibration can be damped by the liquid flow effect.

  When fine amplitude high frequency vibration occurs, the movable shaft 48 is moved up and down by flowing a sinusoidal alternating current through the coil 66 of the actuator 20 under the control of a control unit (not shown), and the vibration plate 18 connected thereto is moved. Is given a vibration of a sinusoidal curve, thereby controlling the pressure of the first liquid chamber 16. For example, when the first fixture 10 vibrates in the axial direction X due to vibrations from the engine, the fluid pressure in the first fluid chamber 16 is increased by the downward displacement of the first fixture 10 in synchronization with this vibration. Thus, by displacing the vibration plate 18 downward, vibration transmission to the vehicle body side can be reduced.

  In particular, in the present embodiment, the fitting member 40 of the diaphragm 22 is press-fitted into the fitting cylinder portion 70 of the cylindrical member 28 via the seal member 76, so that both the liquid chambers 16, The diaphragm 22 can be easily temporarily fixed to the cylindrical member 28 while maintaining the sealing performance of 24. And since the liquid adhering to the surface of the diaphragm 22 can be removed by blowing air or the like in this temporarily fixed state, the assembly workability is excellent.

  Further, since the temporarily fixed fitting portion is finally caulked and fixed by the caulking cylinder portion 74, the sealability of both the liquid chambers 16 and 24 in the product state can be ensured. In addition, the actuator housing space 44 can be sealed. Furthermore, since it can be assembled by a single caulking process with the above configuration, man-hours can be reduced.

  Further, since the actuator 20 is held in a suspended state in the hook-shaped member 30 via the holding plate 80, the actuator 20 can be fixed at a predetermined position in the hook-shaped member 30 by the caulking. Further, since the actuator 20 and the holding plate 80 are connected via the spacer 82, the shape of the holding plate 80 can be made flat over the entire circumference, and the manufacturing cost of the holding plate 80 can be reduced.

(Second Embodiment)
FIG. 6 is a cross-sectional view of an active liquid-filled vibration isolator according to the second embodiment. The second embodiment is different from the first embodiment in the shape of the attachment member 40 of the diaphragm 22.

  That is, in this example, the attachment member 40 is made of a thin metal plate, and the outer peripheral end portion thereof is bent downward X1 to provide the short cylindrical portion 40A, whereby the fitting cylindrical portion is formed by the short cylindrical portion 40A. The outer peripheral surface of the attachment member 40 fitted and held on the inner peripheral surface of 70 is configured. And the sealing material 76 similar to 1st Embodiment is vulcanized-bonded to this outer peripheral surface.

  With this configuration, a cavity is generated between the attachment member 40 main body and the holding plate 80 inside the short cylindrical portion 40A, and cannot be caulked and fixed with the caulking cylinder portion 74 as it is. An annular spacer 86 is arranged so as to fill the cavity.

  Other configurations are basically the same as those of the first embodiment, and the same functions and effects are achieved. In the point that the annular spacer 86 can be omitted, it is more advantageous that the attachment member 40 has the same thickness as the inner peripheral surface of the fitting tube portion 70 as in the first embodiment.

(Third embodiment)
FIG. 7 is a cross-sectional view of an active liquid-filled vibration isolator according to the third embodiment. The third embodiment is different from the first embodiment in that a stopper means 88 for limiting the displacement of the movable shaft 48 in the axial direction X is provided.

  The stopper means 88 is provided with a stopper portion 90 provided on the shaft member 50 of the movable shaft 48 and a stopper portion 90 which is provided on the holding plate 80 due to the displacement in the axial direction X of the movable shaft 48 so as to reduce the displacement. And a stopper portion 92 to be limited.

  The stopper portion 90 is formed so as to protrude from the outer peripheral surface of the shaft member 50 outward in the direction perpendicular to the axis Y1. In this example, the stopper portions 90 are provided in a pair of upper and lower portions separated in the axial direction X. As shown in FIG. 8, the upper stopper portion 90A has a circular shape when viewed in the axial direction, while the lower stopper portion 90B has a portion facing the shaft center L outward in the direction perpendicular to the axis. It has an I-shape projected in the axial direction that protrudes from Y1. The diaphragm 22 is provided so as to be connected to the outer peripheral surface of the shaft member 50 on the vibration plate 18 side, that is, above the stopper portion 90. In addition, the outer peripheral surface of the shaft member 50 including the upper and lower stopper portions 90 is covered with a rubber-like elastic film 94 that is continuous from the diaphragm 22.

  In this example, the holding plate 80 is provided so as to partition the diaphragm 22 from the actuator housing space 44. That is, the holding plate 80 has a disk shape that covers the entire lower surface side of the diaphragm 22, partitions the space in which the diaphragm 22 is displaced from the space 44 in which the actuator 20 is disposed, and the outer peripheral end 80A thereof is a caulking cylinder. It is fixed by caulking by the portion 74.

  The holding plate 80 has a central opening 96 through which the movable shaft 48 passes, and the stopper 92 is provided in the central opening 96. The holding plate 80 is formed in a stepped convex shape at the center where the stopper portion 92 is provided upward, that is, on the side of the vibration plate 18. As a result, the holding plate 80 has a shape in which the outer peripheral side of the stopper portion 92 is recessed to secure a space for the diaphragm 22 to bend and deform.

  The stopper portion 92 extends inward in the direction perpendicular to the axis at the central portion formed in a stepped convex shape, and is provided in a shape inserted from the outside between the pair of stopper portions 90A and 90B. ing. The central opening 96 of the holding plate 80 is opened in an I-shape in plan view so that the lower stopper portion 90B can be inserted (see FIG. 9), and the lower stopper portion 90B is inserted therethrough. The holding plate 80 and the shaft member 50 are assembled by rotating 90 degrees after that (see FIG. 10). Therefore, the opening edge part which mutually opposes in the axial orthogonal direction Y orthogonal to said I character of the center opening part 96 comprises the stopper parts 92 and 92 (refer FIG. 9).

  According to this embodiment, when the movable shaft 48 is displaced in the axial direction X due to excessive input in the axial direction X, the pair of upper and lower stopper portions 90A and 90B provided on the movable shaft 48 side are attached to the second mounting portion. By hitting the stopper portion 92 provided on the tool 12 side, the displacement can be limited. Therefore, an excessive displacement of the movable shaft 48 can be regulated to prevent the actuator 20 from being damaged.

  In addition, since the stopper member 90 is provided on the shaft member 50 in which the diaphragm 22 is integrally formed, the stopper member 90 can be provided without increasing the number of parts. Moreover, when the diaphragm 22 is vulcanized and molded, the elastic coating 94 covering the stopper portion 90 is provided, so that the impact with the stopper portion 92 can be mitigated without providing a separate mold, thereby suppressing an increase in cost. Can do.

  Further, since the stopper portion 92 is provided using the holding plate 80 for holding the actuator 20, the stopper portion 92 can be provided without increasing the number of parts. In addition, since the diaphragm 22 is partitioned from the actuator accommodating space 44 by the holding plate 80, when the diaphragm 22 swells to the actuator 20 side, that is, downward due to the flow of the liquid, the diaphragm 22 is heated to the actuator 20 that has generated heat. Direct contact can be prevented. Therefore, the deterioration of the diaphragm 22 due to heat can be prevented, and the durability of the diaphragm 22 can be improved.

  Other configurations are the same as those of the first embodiment, and the same operational effects are achieved. The diaphragm 22 can be provided by being connected to the outer peripheral end of the upper stopper portion 90A in the direction perpendicular to the axis, but by being provided in a state of being directly coupled to the outer peripheral surface of the shaft member 50 as in the present embodiment, The area of the flexible film portion of the diaphragm 22 can be increased. Therefore, while the other member configurations are not changed, the movable volume of the diaphragm 22 can be increased to ensure a larger amount of liquid flow through the orifice passage 26.

(Other embodiments)
In the above embodiment, the sealing material 76 is fixed to the outer peripheral surface of the mounting member 40 of the diaphragm 22, but the sealing material may be fixed to the inner peripheral surface of the fitting cylinder portion 70. In that case, the sealing material can be vulcanized and bonded to the inner peripheral surface of the fitting tube portion 70 at the time of vulcanization molding of the vibration-proof base 14.

  In the third embodiment, the pair of stopper portions 90 on the movable shaft 48 side are provided apart from each other in the axial direction X. Instead, the stopper portions 92 on the holding plate 80 side are separated in the axial direction X. A pair of upper and lower portions may be provided, and the stopper portion 90 on the movable shaft 48 side may be arranged between the pair of stopper portions 92.

  The present invention can also be applied to a configuration in which the second liquid chamber is provided so as to surround the outer periphery of the vibration-proof substrate, as in the conventional example shown in FIG. In this case, the vibration plate 108 serves as a liquid chamber forming member.

  The present invention can be used for various vibration isolators including an engine mount, and can be applied to, for example, a mount provided between a suspension member and a vehicle body side frame.

1 is a longitudinal sectional view of an active liquid-filled vibration isolator according to a first embodiment. It is an exploded sectional view of a vulcanization fabrication object, a vibration board, an orifice formation member, and a diaphragm in a 1st embodiment. It is a disassembled sectional view of the vibration isolator main body, the holding plate, the actuator, and the hook-shaped member in the first embodiment. It is an expanded sectional view of the caulking fixed part in a 1st embodiment. It is a top view in the state where the holding plate and actuator in the 1st embodiment were assembled. It is a longitudinal cross-sectional view of the active type liquid filled type vibration isolator which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of the active type liquid filled type vibration isolator which concerns on 3rd Embodiment. (A) is a longitudinal cross-sectional view of the shaft member of 3rd Embodiment, (b) is a bottom view. It is a bottom view of the holding plate of 3rd Embodiment. It is a bottom view in the assembly state of the holding plate and shaft member of 3rd Embodiment. It is a longitudinal cross-sectional view of the active liquid filled type vibration isolator according to a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st fixture, 12 ... 2nd fixture, 14 ... Anti-vibration base | substrate, 16 ... 1st liquid chamber, 18 ... Excitation board, 20 ... Actuator, 22 ... Diaphragm (liquid chamber formation member), 24 ... 1st 2 liquid chamber, 26 ... orifice passage, 28 ... cylindrical member, 28A ... open end of cylindrical member, 30 ... bowl-like member, 30A ... open end of bowl-like member, 34 ... rubber-like elastic support part, 40 DESCRIPTION OF SYMBOLS ... Mounting member, 44 ... Actuator accommodation space, 46 ... Stator, 48 ... Movable shaft, 50 ... Shaft member, 68 ... First flange part, 70 ... Fitting cylinder part, 72 ... Second flange part, 74 ... For caulking Cylindrical part, 76 ... Sealing material, 80 ... Holding plate, 80A ... Outer peripheral edge of holding plate, 82 ... Spacer, 88 ... Stopper means, 90 ... Stopped part, 92 ... Stopper part, 96 ... Central opening, X ... Axial direction, X1 ... axially outward (downward), X2 ... axially outward (upper ), Y1 ... the direction perpendicular to the axis outward

Claims (6)

A first fixture;
A second fitting having a tubular shape;
An anti-vibration base made of a rubber-like elastic body that connects the first fixture and the second fixture;
A liquid that is attached to the second fixture in a state of being opposed to the anti-vibration base in the axial direction of the second fixture and forms a liquid sealing chamber between the second anti-vibration base and the anti-vibration base. A chamber forming member;
An actuator disposed on the opposite side of the liquid sealing chamber with the liquid chamber forming member interposed therebetween, and a movable shaft connected to the liquid chamber forming member;
With
The liquid chamber forming member has a ring-shaped mounting member fixed to the second mounting tool on an outer peripheral portion,
The second fixture is formed by caulking and fixing a cylindrical member having the liquid enclosure chamber therein and a hook-shaped member that accommodates the actuator in the opening ends of the two,
An opening end portion of the cylindrical member projects outwardly in a direction perpendicular to the axis, and a mounting member for the liquid chamber forming member is extended axially outward from the tip of the first flange portion. It consists of a fitting cylinder that fits and holds inside,
The opening end portion of the flange-shaped member includes a second flange portion projecting outward in a direction perpendicular to the axis, and a caulking tube portion extending outward in the axial direction from the tip of the second flange portion,
A sealing material made of a rubber-like elastic body is provided on the outer peripheral surface of the mounting member or the inner peripheral surface of the fitting tube portion, and the mounting member is fitted to the fitting tube portion via the sealing material. The fitting cylinder part into which the mounting member is fitted is placed on the second flange part of the hook-like member, the actuator is accommodated in the hook-like member, and the movable shaft is moved to the liquid A liquid-filled vibration isolator which is fixed by caulking so as to wrap an opening end of the tubular member by the caulking tube portion in a state of being connected to a chamber forming member.   The liquid chamber forming member is a diaphragm made of a rubber-like elastic film, and the second member is interposed between the vibration-proof base and the diaphragm via the rubber-like elastic support portion so as to face the vibration-proof base in the axial direction. A vibration plate connected to the fixture side is provided, the liquid sealing chamber is formed by the vibration plate, the first liquid chamber in which the vibration isolation base forms a part of the chamber wall, and the diaphragm is a chamber wall. A second liquid chamber that forms a part and communicates with the first liquid chamber via an orifice passage; and the movable shaft is coupled to the diaphragm in a state of passing through the diaphragm; The liquid filled type vibration damping device according to claim 1, wherein the vibration filled type vibration damping device is configured to be coupled to the vibration plate and to drive the vibration plate in the axial direction.   The actuator includes an annular stator housed in the bowl-shaped member, and the movable shaft supported so as to reciprocate in the axial direction at a central portion of the stator, A holding plate that holds the suspended state in the bowl-shaped member, and the holding plate is connected to the upper surface of the stator via spacers provided at a plurality of locations in the circumferential direction, and the outer peripheral end of the holding plate The liquid-filled vibration isolator according to claim 2, which is superposed on the second flange portion and fixed by caulking with the caulking tube portion together with the opening end portion of the tubular member. The movable shaft includes a shaft member that is a coupling portion to the diaphragm, the diaphragm is integrally formed with the shaft member, and a stoppered portion that protrudes outward in a direction perpendicular to the axis is provided.
The holding plate is provided so as to partition the diaphragm from a housing space of the actuator in the bowl-shaped member, and has an opening through which the movable shaft passes in a central portion, and the axial direction of the movable shaft The liquid-filled type vibration damping device according to claim 3, wherein a stopper portion that restricts the displacement when the stopper portion hits due to the displacement in the opening is provided in the opening.   The active liquid-filled vibration isolator according to claim 4, wherein a pair of the stopper portions are provided apart from each other in the axial direction, and the stopper portions are disposed between the pair of stopper portions.   The actuator includes an annular stator housed in the bowl-shaped member, and the movable shaft that is supported so as to reciprocate in the axial direction at the center of the stator and is coupled to the liquid chamber forming member A holding plate that holds the actuator in a suspended state in the bowl-shaped member, and the holding plate is attached to the upper surface of the stator via spacers provided at a plurality of locations in the circumferential direction. 2. The liquid-filled type prevention according to claim 1, wherein an outer peripheral end portion of the holding plate is overlapped and arranged on the second flange portion and is caulked and fixed by the caulking cylinder portion together with the opening end portion of the cylindrical member. Shaker.

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