JP4361175B2 - Vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration isolator having a main liquid chamber in which a liquid is sealed and a plurality of sub liquid chambers and capable of switching a sub liquid chamber communicating with the main liquid chamber according to a vibration frequency or the like. is there.
[0002]
[Prior art]
As an anti-vibration device applied to a vehicle, an anti-vibration device as an engine mount is disposed between the vehicle engine as a vibration generating unit and the vehicle body as a vibration receiving unit, and the engine is generated by the anti-vibration device. Those that absorb vibrations are known.
[0003]
As the above-mentioned vibration isolator, for example, an inner cylinder is arranged inside an outer cylinder formed in a cylindrical shape, and a main liquid chamber and a plurality of liquids sealed between the outer cylinder and the inner cylinder There is a structure in which a plurality of sub liquid chambers are provided, and each of the plurality of sub liquid chambers communicates with the main liquid chamber through a plurality of restriction passages. In such a main liquid chamber and a sub liquid chamber, a part of the partition wall is formed of an elastic body, and the plurality of restricting passages are each configured as an orifice, and the length and the inner diameter thereof are different from each other. . A valve storage chamber is formed in the middle of the restriction passage, and valves for selectively opening and closing the plurality of restriction passages are arranged in the valve storage chamber. Such a valve is configured, for example, as a cylindrical rotary valve that rotates by torque transmitted from a motor, and selectively opens and closes the restriction passage according to the position (phase) in the rotation direction. In this vibration isolator, the position of the rotary valve is controlled according to the vibration frequency to be absorbed, and one or more restriction passages are selectively opened by the rotary valve. As a result, the dynamic spring constant of the vibration absorbing portion of the vibration isolator composed of the elastic body, the main liquid chamber and the sub liquid chamber, the liquid flowing between these liquid chambers, and the like is large enough to attenuate the vibration frequency to be absorbed. You can adjust it.
[0004]
FIG. 10 shows an example of a motor switch that is applied to the above-described vibration isolator and stops the rotary valve at a predetermined position. The motor switch 150 includes three leaf springs 154, 156, and 158 supported so as to face one side surface of the gear 152 in the axial direction. Here, the gear 152 constitutes a part of a gear train that couples a motor (not shown) to the rotary valve and transmits torque from the motor to the rotary valve. On one side surface of the gear 152, a ring-shaped recess 162 is formed around the rotation shaft 160. A thin ring-shaped insulating plate 164 made of an insulating material is fitted in the recess 162. A thin-film conductive pattern 166 is formed on the outer surface of the insulating plate 164 using a conductive material such as copper. The conductive pattern 166 has openings 168 and 170 formed in two different regions in the radial direction and the circumferential direction with respect to the axis S. Accordingly, only a part of the outer surface of the insulating plate 164 is exposed to the outside through the openings 168 and 170. One opening 168 is disposed so as to be spaced outward from the other opening 170 in the radial direction and to be 180 ° out of phase with the other opening 170 in the circumferential direction.
[0005]
The three leaf springs 154, 156, and 158 are each made of a metal material having conductivity and elasticity, and hemispherical brush portions 154A, 156A, and 158A are provided on the surface of the tip portion on the gear 152 side, respectively. . The leaf springs 154, 156, and 158 are supported in a cantilevered state by a terminal box 172 disposed on a printed wiring board (not shown). The brush portions 154A, 156A, and 158A are electrically conductive patterns. The plate springs 154, 156, and 158 are bent and deformed with respect to the gear 152 so as to be pressed onto the 166 or the insulating plate 164.
[0006]
As shown in FIG. 10, the motor switch 150 always contacts one of the inner and outer leaf springs 154 and 158 through the openings 168 and 170 to the insulating plate 164 when the motor is stopped. Here, when the outer leaf spring 154 is in contact with the insulating plate 164 through the opening 168 as shown in FIG. 10, the inner leaf spring 158 is in pressure contact with the conductive pattern 166. The central leaf spring 156 is always in contact with the conductive pattern 166. Therefore, in the state shown in FIG. 10, the leaf spring 156 and the leaf spring 158 that are in contact with the conductive pattern 166 are in a conductive state via the conductive pattern 166.
[0007]
The openings 168 and 170 of the conductive pattern 166 correspond to two predetermined positions at which the rotary valve is stopped. That is, when the rotary valve stops at one position corresponding to the opening 168, a restriction passage corresponding to this one position (hereinafter referred to as a first restriction passage) is opened and a restriction passage corresponding to the other position. (Hereinafter referred to as the first restriction passage) is closed, and the main liquid chamber and the sub liquid chamber are communicated with each other by the opened first restriction passage. When the rotary valve stops at the other position corresponding to the opening 170, the second restriction passage having a different length and inner diameter from the first restriction passage is opened, the first restriction passage is closed, and the first restriction passage is closed. The main liquid chamber and the sub liquid chamber communicate with each other through the two restriction passages.
[0008]
When the control unit (not shown) of the vibration isolator as described above receives a switching signal from the outside in the state shown in FIG. 10A, it supplies a drive current to the leaf spring 154 pressed against the conductive pattern 158. Supply. This drive current is supplied to the motor through the conductive pattern 166 and the central leaf spring 156. As a result, the motor starts rotating, torque from the motor is transmitted to the rotary valve by the gear train including the gear 152, and the gear 152 rotates in the clockwise direction (arrow C direction). Then, as shown by a two-dot chain line in FIG. 10A, when the inner peripheral opening 170 moves to the position of the leaf spring 158 and the inner peripheral leaf spring 158 contacts the insulating plate 164, the rotary The valve opens the second restriction passage corresponding to the opening 170 and stops the motor. From this state, when the control unit further receives a switching signal, it supplies a driving current only to the outer leaf spring 154 and supplies this driving current to the motor through the conductive pattern 166 and the central leaf spring 156. As a result, the motor starts rotating and stops when the opening 168 on the gear 152 moves to the position of the leaf spring 154. At this time, the first restriction passage corresponding to the opening 158 is opened by the rotary valve.
[0009]
[Problems to be solved by the invention]
However, in the motor switch 150 as described above, the conductive pattern 166 is worn by contact with the leaf springs 154, 156, and 158, and wear powder of the conductive material forming the conductive pattern 166 is generated. When conductive wear powder accumulates on the insulating plate 164 as the number of switching of the restriction passage increases, for example, the leaf spring 154 moves to the inside of the opening 168 as shown by the solid line in FIG. Even then, the leaf spring 154 and the central leaf spring 156 may be short-circuited (conducted) through the wear powder. Thus, if a short circuit occurs between the leaf spring 154 on the insulating plate 164 and the central leaf spring 156, the rotary valve cannot be stopped at a position where the first restriction passage is normally opened.
[0010]
An object of the present invention is to provide an anti-vibration device that takes into account the above facts and prevents a reduction in accuracy of a motor stop timing and a malfunction caused by a motor switch when a valve is operated by a motor to switch an open / close state of a liquid passage. There is.
[0011]
[Means for Solving the Problems]
  The vibration isolator according to claim 1 is an inner cylinder connected to one of the vibration generator and the vibration receiver, and an inner cylinder connected to the other of the vibration generator and the vibration receiver and disposed inside the outer cylinder. A cylinder, an elastic body disposed between the outer cylinder and the inner cylinder, a main liquid chamber in which liquid is sealed with the elastic body as a part of a partition wall, and an internal volume is changed by deformation of the elastic body; A sub-liquid chamber in which at least a part of the partition wall is elastically deformable and in which a liquid is enclosed; a plurality of liquid passages connecting between the main liquid chamber and the sub-liquid chamber;By rotating around the rotation axisA valve that opens and closes each of the plurality of liquid passages, and a motor that is connected to the valve and rotates when the opening and closing states of the plurality of liquid passages are switched,Connected to the valve so as to be coaxial with the valve, and integrated with the valveRotate,AboveA rotating body provided with a concave or convex cam portion at a portion corresponding to the plurality of liquid passages around the rotation axis, and a flexible spring member are elastically deformed or restored along the cam portion. And a motor switch for stop control that stops the motor when the spring member is elastically deformed or restored along the cam portion.
[0012]
According to the vibration isolator having the above-described configuration, the concave or convex cam portion is provided in the portion corresponding to the plurality of liquid passages around the rotation axis of the rotating body that rotates in conjunction with the operation of the valve, and the spring member is If the elastic deformation or restoration along the cam portion causes the motor switch to stop the motor, the motor switch causes the valve to operate when elastic deformation or restoration along the cam portion, which is a mechanical movement, occurs in the spring member. If the cam portion is provided in the rotating body in advance so that the dimensional accuracy and the positional accuracy are sufficiently high, the valve is set to the desired fluid passage opening / closing state when switching the liquid passage opening / closing state. You can stop to the corresponding position with high accuracy. If the cam part is made of a material with sufficient wear resistance and strength so that the outer shape of the cam part does not change due to wear or the like even if the number of times the liquid passage is switched by the valve increases, Since the motor stop timing can be prevented from changing with time, the accuracy of the valve stop position can be prevented from decreasing with time.
[0013]
  The vibration isolator according to claim 2 is the vibration isolator according to claim 1,The cam portion provided on the rotating body includes a first cam portion provided at two positions whose phase angles are different from each other by 180 ° and a second cam portion provided at two positions whose phase angles are different from each other by 180 °. The first cam portion and the second cam portion are arranged at positions where the phases are different from each other by 90 °.
  Claim 3The described vibration isolator isClaim 1 or claim 2In the anti-vibration device according to claim 1, the motor switch contacts the spring member and becomes conductive, and the spring member elastically deforms or restores along the cam portion and contacts or separates from the spring member. It has a contact member to do.
[0014]
According to the vibration isolator having the above-described configuration, the contact member that is brought into conduction when in contact with the spring member is elastically deformed or restored along the cam portion, and is brought into contact with or separated from the spring member. When the spring member undergoes elastic deformation or restoration along the cam portion, the conduction state between the spring member and the contact member changes, so the motor is stopped in synchronization with the elastic deformation or restoration along the cam portion of the spring member. It becomes possible to make it.
[0015]
  Claim 4The vibration isolator described in the claims1-3In the vibration isolator described above, the rotating body includes at least one gear that forms a gear train that connects the motor to the valve so as to transmit torque.
[0016]
According to the vibration isolator having the above-described configuration, since the rotating body of the motor switch includes the gear that connects the motor to the valve, a part of the motor switch and the gear train can be partially shared. Can be reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.
[0018]
(Configuration of the embodiment)
1 to 3 show an anti-vibration device according to an embodiment of the present invention, which is an embodiment in which the present invention is applied to a so-called bush type anti-vibration device. The direction along the center line is the axial direction. The vibration isolator 10 includes an attachment frame 11 for connection to a vehicle body (not shown), and a cylindrical outer tube fitting 13 is disposed in an annular portion 12 of the attachment frame 11.
[0019]
The extending end portion of the thin first diaphragm 14 is vulcanized and bonded to the inner peripheral surface of the outer cylinder fitting 13. As shown in FIG. 1, the first diaphragm 14 is disposed on the upper portion of the outer tube fitting 13 and constitutes an elastically deformable partition wall of a first sub liquid chamber to be described later. A partition wall 15 formed integrally with the first diaphragm 14 is provided on the proximal end side of the first diaphragm 14, and a portion adjacent to the first diaphragm 14 across the partition wall 15 is thin. Thus, the second diaphragm 16 having higher rigidity than the first diaphragm 14 is formed integrally with the partition wall 17. The extended end portion of the second diaphragm 16 is vulcanized and bonded to the inner peripheral surface of the outer cylinder fitting 13 to constitute an elastically deformable partition wall of a second sub liquid chamber to be described later. The first diaphragm 14, the partition wall 15, and the second diaphragm 16 are integrally formed of rubber. Air diaphragms 17 and 18 are formed between the diaphragms 14 and 16 and the outer tube fitting 13. These air chambers 17 and 18 communicate with the outside as necessary.
[0020]
An intermediate cylinder 20 and an intermediate block 21 are inserted into the outer cylinder fitting 13. The intermediate block 21 is formed in a substantially semicircular block shape when viewed from the axial direction of the outer cylinder fitting 13, and the outer peripheral surface of the intermediate block 21 is in close contact with the inner circumference surface of the outer cylinder fitting 13 as shown in FIG. 1. is doing. As shown in FIG. 3, circular flange portions 22 are formed at both axial ends of the intermediate cylinder 20 so as to protrude in the radial direction, and the intermediate block 21 is inserted between the pair of flange portions 22. Yes. The outer peripheral surfaces of the pair of flange portions 22 are in close contact with the inner peripheral surface of the outer tube fitting 13.
[0021]
As shown in FIG. 1, the intermediate portion of the intermediate cylinder 20 in the axial direction is composed of a substantially U-shaped plate member 23 opened downward, and both axial ends of the plate member 23 are fixed to the pair of flange portions 22. Has been. The plate member 23 has a U-shaped open portion 23A opposed to a flat surface portion 21A formed on the upper surface of the intermediate block 21, and an inner cylinder fitting 24 connected to an engine (not shown) passes through the open portion 23A. ing. The inner cylinder fitting 24 is arranged so as to be coaxial with the outer cylinder fitting 13 when the engine is mounted. Therefore, when the engine is not installed, the inner cylinder fitting 24 is arranged non-coaxially as shown in FIGS. Has been. An elastic body 25 formed of a rubber material or the like is stretched between the inner cylinder fitting 24 and the intermediate cylinder 20, and the inner cylinder fitting 24 can be moved relative to the outer cylinder fitting 13 by the elastic body 25. It has become.
[0022]
As shown in FIG. 1, the elastic body 25 extends from the open portion 23 </ b> A to the outer peripheral surface of the plate member 23 in the intermediate cylinder 20 to form a thin elastic film 26, and covers the entire outer peripheral surface of the plate member 23. The outer peripheral surface of the intermediate cylinder 20 is in close contact with the inner peripheral circular arc surface 21 </ b> B at both ends in the circumferential direction of the intermediate block 21 through the elastic film 26. The elastic body 25 is formed with a notch 25A which is an intermediate portion in the axial direction and is recessed in a V shape toward the axis of the inner cylinder fitting 24 at the lower side of the inner cylinder fitting 24. A space between 25 A and the flat portion 21 A of the intermediate block 24 is a main liquid chamber 27. On the other hand, a space is formed between the pair of flange portions 22 of the intermediate cylinder 20 by the intermediate cylinder 20 and the first diaphragm 14, and this space is defined as the first sub liquid chamber 28, and the intermediate cylinder 20 and the second cylinder 22 are provided. A space adjacent to the first sub liquid chamber 28 is formed by the diaphragm 18, and this space serves as a second sub liquid chamber 29. The cavity 30 formed between the open portion 23A of the plate member 23 and the elastic body 25 penetrates in the axial direction as shown in FIG.
[0023]
As shown in FIG. 3, groove portions 31 and 32 that extend in the circumferential direction and have different widths in the axial direction are formed on the outer peripheral surface of the intermediate block 21. The outer peripheral side is closed by the outer tube fitting 13. One end of the narrow groove 31 in the axial direction among these grooves 31 and 32 opens to one end 21C (the left end in FIG. 1) of the intermediate block 21 and is connected to the first sub liquid chamber 28. ing. As shown in FIG. 1, the other end of the groove 31 is connected to the main liquid chamber 27 through a through hole 33 penetrating from the bottom of the intermediate block 21 to the flat surface 21 </ b> A. The liquid passage composed of the groove portion 31 and the outer tube fitting 13 and the through hole 33 communicate the main liquid chamber 27 and the first sub liquid chamber 28 to constitute a shake orifice 34 that is a restriction passage for absorbing shake vibration. ing. In addition, one end of the groove portion 32 having a wide axial direction among the groove portions 31 and 32 opens to the other end portion 21 </ b> D (right end portion in FIG. 1) of the intermediate block 21 and is connected to the second sub liquid chamber 29. Yes.
[0024]
As shown in FIG. 1, a circular hole 35 is formed on the flat portion 21 </ b> A side of the intermediate block 21, and the bottom of the circular hole 35 has a smaller diameter than the circular hole 35, and A circular through hole 36 penetrating to the outer peripheral surface is formed coaxially with the circular hole 35. A counterbore part 37 is formed coaxially with the circular through hole 36 on the outer peripheral side of the intermediate block 21, and an annular groove part 38 is provided outside the counterbore part 37. A sealing O-ring 39 is fitted in the groove 38. In addition, a circular opening 13 </ b> A having the same inner diameter as that of the counterbore part 37 is formed coaxially with the counterbore part 37. Further, the annular portion 12 is formed with a flange insertion port 12 </ b> A that is coaxial with the circular opening 40 and has a larger diameter than the circular opening 40.
[0025]
A rotary valve 41 is rotatably inserted into the circular hole 35 and the circular through hole 36 of the intermediate block 21. A large-diameter cylindrical portion 42 having an open upper surface is provided on the upper portion of the rotary valve 41, and a small-diameter shaft portion 43 is coaxially and integrally with the cylindrical portion 42 on the opposite side of the cylindrical portion 42. Is provided. Further, the flat portion 21A of the intermediate block 21 is formed with a fitting insertion portion 21E having a rectangular concave shape at the peripheral edge of the circular hole 35, and a rectangular thin plate-like lid plate 44 is fitted into the fitting insertion portion 21E. ing. The cover plate 44 is formed with a circular opening 44A having a diameter smaller than that of the circular hole 35 at a position corresponding to the circular hole 35. The cover plate 44 passes through the circular opening 44A and the inside of the cylindrical portion 42 of the rotary valve 41 and the main liquid. The chamber 27 communicates with the rotary valve 41 and prevents the rotary valve 41 from falling off the circular hole 35. A pair of annular grooves are formed on the outer peripheral surface of the shaft portion 43 of the rotary valve 41, and a pair of O-rings 45 are fitted into the pair of annular grooves, respectively. The O-ring 45 prevents liquid leakage from the circular through hole 36.
[0026]
On the other hand, as shown in FIG. 1, a pair of passages 46 and 47 are formed in the intermediate block 21 so as to extend in opposite directions along the radial direction from the inner peripheral surface of the circular hole 35. . One passage 46 extends from the inner peripheral surface of the circular hole 35 toward the end portion 21 </ b> D side of the intermediate block 21, and is connected to a groove portion 32 formed on the outer peripheral surface of the intermediate block 21. Accordingly, the passage 46 communicates with the second auxiliary liquid chamber 29 via the groove portion 32, and the passage 46 and the liquid passage formed of the groove portion 32 and the outer cylinder fitting 13 are idle orifices which are restriction passages for absorbing idle vibration. 47 is constituted.
[0027]
The other passage 47 extends from the inner peripheral surface of the circular hole 35 toward the end portion 21 </ b> C and opens into a concave portion 49 provided on the outer peripheral surface of the intermediate block 21. The concave portion 49 is curved in an arc shape along the outer peripheral surface of the intermediate block 21, and a groove portion 49A for fixing the third diaphragm is formed on the peripheral portion. The outer periphery of the third diaphragm 50 has a rib shape corresponding to the shape of the groove 49A. The outer periphery is fitted into the groove 49A over the entire circumference, and the vicinity of the outer periphery is an intermediate block. 21 and the outer tube fitting 13 are fixed. The third diaphragm 50 is curved so as to be convex toward the concave portion 49, forms a third sub liquid chamber 51 between the third diaphragm 50 and the elastic deformation of the third sub liquid chamber 51. Possible partition walls are formed. Furthermore, the third diaphragm 50 forms an air chamber 52 between the outer cylinder fitting 13 and the third diaphragm 50. Here, the area of the third diaphragm 51 is smaller than the area of the first diaphragm 14, and the rigidity is larger than the rigidity of the first diaphragm 14. A passage 47 connected to the main liquid chamber 27 and the third sub-liquid chamber 51 constitutes a boom orifice 53 that is a limit passage for absorbing the boom noise. The main liquid chamber 27 and the sub liquid chambers 28, 29, 51 are filled and filled with a liquid such as ethylene glycol, respectively, and between the main liquid chamber 27 and the second sub liquid chamber 29 and between the main liquid chamber 27 and the third sub liquid. 51 is connected by orifices 48 and 53 through a rotary valve 41.
[0028]
A through hole 54 is formed in the outer peripheral surface of the cylindrical portion 42 of the rotary valve 41, and the through hole 54 communicates the inside and outside of the cylindrical portion 42. Thus, when the rotary valve 41 rotates to a position where the through hole 54 faces the passage 46, the main liquid chamber 27 and the second sub liquid chamber 29 communicate with each other through the idle orifice 48, and the rotary valve 41 is connected to the through hole. When the shaft 54 is rotated to a position facing the passage 47, the main liquid chamber 27 and the third sub liquid chamber 51 are communicated with each other by the squeezing orifice 53.
[0029]
On the other hand, a motor unit 60 incorporating a motor or the like for operating the rotary valve 41 is attached to the annular portion 12 of the attachment frame 11 as shown in FIG. As shown in FIG. 4, the motor unit 60 includes a casing 61 that constitutes an outer portion. The casing 61 includes an upper case 62 disposed on the annular portion 12 side and a lower side of the upper case 62. The casing 61 includes a lower case 63 to be attached, and the inside of the casing 61 is a hollow storage chamber 64.
The upper case 62 is provided with an outer flange portion 65 fixed to the annular portion 12 so as to close the flange insertion port 41 on the upper surface thereof, and the outer peripheral surface of the annular portion 12 is provided on the upper surface of the outer flange portion 65. A concave curved surface 65A having the same radius of curvature is formed.
[0030]
An inner flange portion 66 having a protrusion length corresponding to the thickness of the annular portion 12 protrudes from the center of the upper surface of the outer flange portion 65, and the same curvature as that of the outer peripheral surface of the outer tube fitting 13 is formed on the upper surface of the inner flange portion 66. A concave curved surface 66A having a radius is formed. An annular groove 66B is formed along the outer peripheral end of the concave curved surface 66A of the inner flange portion 66, and an O-ring 67 for preventing liquid leakage is fitted into the groove 66B.
[0031]
A cylindrical insertion portion 68 projects from the center of the upper surface of the inner flange portion 66. The hollow portion 68A in the insertion portion 68 communicates with the storage chamber 64 through an insertion hole 68B opened in the bottom plate portion. A disc-shaped lid member 69 made of resin or the like is fitted into the opening on the distal end side of the insertion portion 68 to close the upper end of the hollow portion 68A. A through hole 69 </ b> A is formed at the center of the lid member 69. The valve drive shaft 70 is inserted into the hollow portion 68 </ b> A of the insertion portion 68. As shown in FIG. 4, the upper end side of the valve drive shaft 70 is a narrow shaft 71 that is thinner than the lower end side, and the thin shaft 71 protrudes upward from the insertion portion 68 through the through hole 69 </ b> A of the lid member 69. Yes. At the tip of the thin shaft 71, the axis S of the valve operating shaft 70 is provided.₁A connecting portion 71A having a flat plate shape is formed.
[0032]
As shown in FIG. 1, the motor unit 60 causes the concave curved surface 65A of the outer flange portion 65 to be in close contact with the outer peripheral surface of the annular portion 13, and the inner flange portion 66 is inserted into the annular portion 12 through the flange insertion port 12A. In addition, the insertion portion 68 is inserted into the counterbore portion 37 through the circular opening 13 </ b> A of the outer cylinder fitting 13. In this state, the outer flange portion 65 is fastened and fixed to the annular portion 12 by a fastening member (not shown) such as a bolt. At this time, the connecting portion 71A of the thin shaft 71 protruding from the insertion portion 68 is inserted into the slit-like fitting groove 43A formed on the lower end surface of the shaft portion 43 of the rotary valve 41. As a result, the valve drive shaft 70 is connected to the rotary valve 41, and the valve drive shaft 70 and the rotary valve 41 rotate together.
[0033]
A worm wheel 72 connected to the valve drive shaft 70 is arranged in the storage chamber 64 of the casing 61. Inclined teeth 73 are formed on the outer circumferential surface of the worm wheel 72. Here, the worm wheel 72 is integrally formed of a non-conductive material such as a resin material, and is a gear train that transmits torque from the motor 74 disposed in the storage chamber 64 to the valve drive shaft 70. Part of it.
[0034]
From the upper surface of the worm wheel 72, the axis S₁A cylindrical shaft coupling portion 75 projects from the center. The shaft coupling portion 75 has an axis S as shown in FIG.₁A coupling hole 75A corresponding to the outer diameter of the valve drive shaft 70 is formed along the through hole 75B, and a through hole 75B penetrating in the radial direction across the coupling hole 75A is formed. Further, an annular guide groove 76 is formed on the upper surface of the worm wheel 72 along the outer periphery of the shaft coupling portion 75. A guide portion 77 formed on the inner surface of the upper case 62 on the storage chamber 64 side is slidably inserted into the guide groove 76.
[0035]
The inner surface of the upper case 62 has an axial center S on the inner peripheral side of the guide portion 77.₁A circular recess 78 is formed around the center. The shaft coupling portion 75 of the worm wheel 72 is inserted into the recess 78, and the valve drive shaft 70 protrudes from the storage chamber 64 into the hollow portion 68A through the insertion hole 68B. A seal ring 79 made of an elastic material is inserted between the top surface of the recess 78 and the upper surface of the shaft coupling portion 75, and the seal ring 79 is an outer peripheral surface of the valve drive shaft 70 and an inner peripheral surface of the recess 78. It is closely attached to. The seal ring 79 prevents liquid from entering the storage chamber 64 from the rotary valve 41 side.
[0036]
As shown in FIG. 4, the shaft center S extends from the lower surface of the worm wheel 72.₁A round bar-like rotary shaft 80 projects along the axis of the rotary shaft 80, and the tip surface of the rotary shaft 80 is formed in a hemispherical shape. On the other hand, a flat printed wiring board 81 is disposed in the casing 61 so as to face the lower surface of the worm wheel 72. The upper surface of the printed wiring board 81 facing the worm wheel 72 has a substantially ring shape. A gear cover 82 is installed. The gear cover 82 has an axis S₁A circular bearing hole 82A is formed along the line. The tip end of the rotary shaft 80 of the worm wheel 72 is inserted into the bearing hole 82A, and the tip end surface of the rotary shaft 80 is in contact with the printed wiring board 81 through the bearing hole 82A. Accordingly, the worm wheel 72 is positioned in the axial direction and the radial direction by the guide portion 77 of the upper case 62, the printed wiring board 81, and the gear cover 82, and is rotatably supported coaxially with the valve drive shaft 70.
[0037]
The lower end portion of the valve drive shaft 70 is inserted into the coupling hole 75A of the shaft coupling portion 75 of the worm wheel 72 as shown in FIG. The lower end of the valve drive shaft 70 has an axis S₁A round bar-like connecting pin 83 protruding in the radial direction is integrally formed. The connecting pin 83 is longer than the diameter of the valve drive shaft 70, and both end portions protruding from the outer peripheral surface of the valve drive shaft 70 are inserted into the through holes 75 </ b> B of the shaft coupling portion 75. As a result, the valve drive shaft 70 is connected to the worm wheel 72 and rotates together with the worm wheel 72.
[0038]
An intermediate gear 83 is disposed in the storage chamber 84 of the casing 61 adjacent to the worm wheel 72 as shown in FIG. A worm (worm gear) 85 is provided on one end of the intermediate gear 84, and teeth (worm teeth) 85 </ b> A corresponding to the teeth 72 of the worm wheel 72 are formed on the outer peripheral surface of the worm 85. A gear 86 having a diameter larger than that of the worm 85 is provided integrally with the worm 85 on the other end side of the intermediate gear 84, and a flat tooth 86A is formed on the outer peripheral surface of the gear 86. ing. The intermediate gear 84 is rotatably supported by a pair of bearings 87 arranged on the upper case 62 at both ends thereof. The pair of bearings 87 has an axis S of the intermediate gear 84.₂The axis S₁The intermediate gear 84 is supported so that the teeth 72A of the worm wheel 72 and the teeth 85A of the worm 85 mesh with each other.
[0039]
A motor 88 for rotating the rotary valve 41 is installed on the printed wiring board 81 as shown in FIG. A pinion 89 having a diameter smaller than that of the gear 86 is coaxially fixed to the tip of the drive shaft of the motor 88. Flat teeth 89 A corresponding to the flat teeth 86 A of the gear 86 are formed on the outer peripheral surface of the pinion 89. Here, the motor 88 has an axis S of its drive shaft._ThreeIs the axis S of the intermediate gear 84₂The pinion 89 is supported so that the spur tooth 89A meshes with the spur tooth 86A of the gear 86.
[0040]
In the vibration isolator 10 of the present embodiment, as shown in FIG. 4, the worm wheel 72, the intermediate gear 84, and the pinion 89 constitute a gear train 90 that transmits torque from the motor 88 to the rotary valve 41. The torque generated by 88 is transmitted to the valve drive shaft 70 that rotates together with the rotary valve 41 by the gear train 90.
[0041]
In the vibration isolator 10 of the present embodiment, the rotary valve 41 is in a position where the main liquid chamber 27 and the second sub liquid chamber 29 shown in FIG. 1 communicate with each other by the idle orifice 48 (hereinafter referred to as a first position). 2 and the position where the main liquid chamber 27 and the third sub liquid chamber 51 are communicated with each other by the squeezing orifice 53 (hereinafter referred to as the second position) must be accurately stopped. is there. Therefore, a motor switch 91 that detects that the rotary valve 41 is in the first position and the second position and stops the motor 88 in synchronization with the detection timing is disposed in the storage chamber 64. Yes.
[0042]
The motor switch 91 is supported so as to face the lower surface of the worm wheel 72 as shown in FIGS. 6 and 7 (however, the worm wheel 72 is shown upside down in FIGS. 6 and 7). Two thin plate-like leaf springs 92 and 93 are provided. The plate springs 92 and 93 are each formed of a material having conductivity and elasticity, such as a phosphor bronze plate, and the plate springs 92 and 93 are separated by a terminal box 94 installed on the printed wiring board 81. Supported by holding state. As shown in FIG. 6 (A), the leaf springs 92 and 93 have a longitudinal center line having an axis S.₁Is substantially parallel to the tangential direction of the circular locus centered on the axis S.₁One leaf spring 92 is disposed on the inner peripheral side, and the other leaf spring 93 is disposed on the outer peripheral side along the radial direction.
[0043]
Further, as shown in FIG. 6B, the leaf springs 92 and 93 are inclined so as to approach the worm wheel 72 from the proximal end side connected to the terminal box 94 toward the distal end side which is a free end. The distal ends of these leaf springs 92, 93 are bent so as to have a larger inclination angle with respect to the flat base end portions 92A, 93A, and curved in a substantially J shape to form a convex curved surface as a worm wheel. Sliding contact portions 92 </ b> B and 93 </ b> B are formed close to the lower surface of 72.
[0044]
As shown in FIGS. 6B and 6C, the terminal box 94 is arranged so that the contact members 95 and 96 face the leaf springs 92 and 93 between the leaf springs 92 and 93 and the worm wheel 72, respectively. I support it. The contact member 95 facing the outer peripheral leaf spring 92 includes a pair of contact plates 95A as shown in FIG. Each of the pair of contact plates 95A is made of a conductive material formed in a long plate shape, and is connected so as to be electrically connected to each other in the terminal box 74, and its longitudinal center line is the longitudinal direction of the leaf spring 92. The terminal box 94 is supported in a cantilever state so as to be substantially parallel. In addition, a hemispherical brush portion 95B is formed on the front surface of the pair of contact plates 95A on the surface facing the leaf spring 92, respectively. As a result, the contact plate 95A contacts and separates from the leaf spring 92 via the brush portion 95B. On the other hand, the contact member 96 facing the leaf spring 93 also includes a pair of contact plates 96A each having a brush portion 96B formed at the tip thereof, and has the same structure as the contact member 95. The contact members 95 and 96 are integral springs and are conductive.
[0045]
In the present embodiment, the worm wheel 72 constitutes a part of the gear train 90 and constitutes a rotating body that is a part of the motor switch 91. On the lower surface of the worm wheel 72, a ring-shaped recess 97 is formed around the rotation shaft 80 coaxially with the rotation shaft 80. On the bottom surface of the recess 97, as shown in FIGS.₁The first cam portion 98 and the second cam portion 99 are formed in two regions that are different from each other in the radial direction. These cam portions 98 and 99 are formed integrally with a worm wheel 72 made of a non-conductive material, and project from the bottom surface of the flat concave portion 97 to the printed wiring board 81 side.
[0046]
Here, the first cam portion 98 disposed on the outer peripheral side has an axis S as shown in FIG.₁Axis center S₁To a leaf spring 92 along a circular locus having a radius. The first cam portions 98 are respectively provided at two positions whose phase angles are different from each other by 180 ° in the circumferential direction, and are formed in a belt shape whose width in the radial direction is constant when viewed from the axial direction. Further, as shown in FIG. 6B, the first cam portion 98 has an axis S.₁Is formed in a substantially trapezoidal shape, the central portion in the circumferential direction is a flat surface 98A composed of a plane parallel to the bottom surface of the concave portion 97, and both end portions in the circumferential direction are the bottom surface of the concave portion 97 and the flat surface 98A, respectively. Are inclined surfaces 98B.
[0047]
On the other hand, the second cam portion 99 arranged on the inner peripheral side has an axis S as shown in FIG.₁Axis center S₁To a leaf spring 93 along a circular locus having a radius. The second cam portions 99 are respectively provided at two positions whose phase angles are different from each other by 180 ° in the circumferential direction, and are formed in a belt shape having a constant radial width when viewed from the axial direction. Further, as shown in FIG. 7B, the second cam portion 99 has an axis S.₁Is formed in a substantially trapezoidal shape, the central portion in the circumferential direction is a flat surface 99A made of a plane parallel to the bottom surface of the concave portion 97, and the both bottom portions of the circumferential direction are the bottom surface of the concave portion 97 and the flat surface 99A. It is set as the inclined surface 99B to connect. The two first cam portions 98 and the second cam portions 99 are provided so that the phase angles in the circumferential direction are different from each other by 90 ° and the height from the bottom surface of the recess 97 is equal to each other. .
[0048]
The leaf springs 92 and 93 are supported by the terminal box 94 so that the sliding contact portions 92B and 93B are separated from the bottom surface of the recess 97 by a predetermined distance L as shown in FIGS. 6 (C) and 7 (B). Yes. Here, the distance L is shorter than the height of the cam portions 98 and 99.
[0049]
The motor switch 91 always contacts one of the leaf springs 92 and 93 with the cam portions 98 and 99 when the motor 88 is stopped. Here, as shown in FIG. 6B, the worm wheel 72 stops at the first position described above, and the sliding contact portion 92B of the leaf spring 92 on the outer peripheral side becomes the flat portion 98A of the cam portion 98. When in contact, the leaf spring 92 is pressed by the cam portion 98 to bend and deform toward the printed wiring board 81 side. In a state where the leaf spring 92 is bent and deformed by the cam portion 98, the leaf spring 92 is separated from the two contact plates 95 </ b> A and 95 </ b> B constituting the contact member 95. When the worm wheel 72 is stopped at a position corresponding to the first position, the inner peripheral leaf spring 93 is in a position not in contact with the cam portion 98 as shown in FIG. 6C. In this state, no bending deformation occurs (restored state). In this restored state, the base end portion 93 </ b> A of the leaf spring 93 comes into contact with the two contact plates 96 </ b> A and 96 </ b> B constituting the contact member 96 and is brought into conduction with the contact member 96.
[0050]
As shown in FIG. 7, when the worm wheel 72 is stopped at the second position described above, the sliding contact portion 93B of the inner peripheral leaf spring 93 is in contact with the flat portion 99A of the cam portion 99. The leaf spring 93 is separated from the two contact plates 96A and 96B, and the leaf spring 92 on the outer peripheral side is separated from the cam portion 98 to be restored, so that the leaf spring 92 is separated from the two contact plates. 95A and 95B are contacted, and the leaf spring 92 and the contact member 95 become conductive.
[0051]
Here, the two contact plates 95A and 95B constituting the contact member 95 are in pressure contact with both ends in the width direction of the leaf spring 92 in the restored state. Thereby, plastic torsional deformation and radial deviation around the longitudinal center line of the leaf spring 92 are suppressed. For the same reason, the two contact plates 96A and 96B constituting the contact member 96 are also brought into pressure contact with both ends in the width direction of the leaf spring 96 in the restored state.
[0052]
The motor 88 is connected to the controller 100 as shown in FIG. 1, and is rotated in one direction by being supplied with a drive current by the controller 100, and is stopped by being cut off from the supply of the drive current by the motor switch 91. It has become. Here, the rotation direction of the motor 88 is determined so as to rotate the worm wheel 72 clockwise (in the direction of arrow C in FIGS. 6 and 7) when viewed from the printed wiring board 81 side. Further, the controller 100 receives at least detection signals from the vehicle speed sensor 101 and the engine speed detection sensor 101 and detects the vehicle speed and the engine speed, respectively, so that an idle vibration, an idle vibration or a shake vibration occurs. ing.
[0053]
As shown in FIG. 5, three power cables 103, 104, and 105 are connected to the printed wiring board 81 in the storage chamber 64. The power cable 104, which is a common wire, is connected to the printed wiring board 81 and the terminal box. The leaf springs 93, 94 and the controller 100 are connected via 94. The power cables 103 and 105 connect the contact members 95 and 96 and the controller 100 via the printed wiring 81 and the terminal box 94, respectively.
[0054]
The controller 100 supplies drive current only to one power cable 103 corresponding to the idle signal when idle vibration occurs, and supplies drive current only to the other power cable 105 corresponding to shake vibration when shake vibration occurs. .
[0055]
(Operation of the embodiment)
Next, the operation of the vibration isolator 10 according to this embodiment will be described.
[0056]
When the engine connected to the inner cylinder fitting 24 operates, the vibration of the engine is transmitted to the elastic body 25 via the inner cylinder fitting 24. The elastic body 25 acts as a vibration absorber, and vibrations are absorbed by the vibration damping function based on the internal friction of the elastic body 25. Further, the liquid in the main liquid chamber 27 and the first sub liquid chamber 28 whose inner volumes change with deformation of the elastic body 25 and the first diaphragm 14 flows to each other via the shake orifice 34, and the elastic body 25 and The liquid in the main liquid chamber 27 and the second sub liquid chamber 29 whose internal volumes change with the deformation of the second diaphragm 16 flows to each other through the idle orifice 48, and the elastic body 25 and the third diaphragm 50. Liquids in the main liquid chamber 27 and the third sub liquid chamber 51 whose internal volumes change with deformation flow through the orifice 53 for squeezing, and the viscous resistance of the liquid flow and the liquid column generated in these orifice spaces. The anti-vibration effect can be improved by a damping action based on resonance.
[0057]
In addition to the shake orifice 34 that is always open, an idle orifice 48 and a mass orifice 53 are provided, and the controller 100 and the motor switch 91 control the main liquid chamber 27 to communicate with either the orifice 34 or 53. As a result of the provision of the rotary valve 41, the following operation is achieved.
[0058]
For example, when the vehicle accelerates from an idling state (stopped state) to a high speed range of 70 to 80 km / h or more, idle vibration generation (20 to 40 Hz) is mainly generated at a speed of 5 km / h or less from the idling state. When the traveling speed becomes 70 to 80 km / h or more, a shake vibration generation state in which shake vibration (less than 15 Hz) is mainly generated is obtained. The controller 100 determines whether the current vibration state is a shake vibration generation state or an idle vibration generation state based on signals from the vehicle speed sensor 101 and the engine speed detection sensor 102.
[0059]
Here, the controller 100 determines that the current vibration state is an idle vibration generation state before the vehicle travels, that is, at the start of control, and supplies a drive current only to the power cable 103. At this time, as shown in FIG. 6, in the motor switch 91, only the outer leaf spring 92 is elastically deformed by the first cam portion 98, the leaf spring 92 and the contact member 95 are separated, and the motor switch 91 is in the restored state. The leaf spring 93 on the peripheral side comes into contact with the contact member 96, and the leaf spring 93 and the contact member 96 are in a conductive state. The rotary valve 42 is stopped at the first position where the main liquid chamber 27 communicates with the idle orifice 48 as shown in FIG.
[0060]
When the controller 100 determines that the vehicle speed has shifted from the low speed range to the high speed range and the vibration state has changed from the idle vibration generation state to the shake vibration generation state, the controller 100 switches the supply destination of the drive current from the power cable 103 to the power cable 105. . As a result, the drive current is supplied to the motor 88 via the leaf spring 93 and the contact member 96 that are in electrical communication with the power cable 105.
[0061]
The motor 88 is rotated by the drive current from the power cable 105, and the worm wheel 72 connected to the motor 88 rotates in the direction of arrow C from the position shown in FIG. At this time, the rotary valve 41 connected to the worm wheel 72 by the valve drive shaft 70 also rotates integrally with the worm wheel 72 from the first position shown in FIG. When the worm wheel 72 is rotated to the position shown in FIG. 7, the leaf spring 93 is elastically deformed by the second cam portion 99, and the leaf spring 93 and the contact member 96 are separated from each other. Thereby, the drive current to the motor 88 is interrupted and the motor 88 stops. At this time, the rotary valve 41 stops at the second position shown in FIG. 2 to close the idle orifice 48 and allows the main liquid chamber 27 to communicate with the bulk orifice 53.
[0062]
As a result, the shake orifice 34 that is always open communicates the main liquid chamber 27 and the first sub liquid chamber 28, and the squeezing orifice 53 communicates the main liquid chamber 27 and the third sub liquid chamber 51. As a result, a pressure change based on the engine vibration generated in the main liquid chamber 27 is transmitted to the liquid in the shake orifice 34 and the sparge orifice 53, and the shake vibration is absorbed by receiving the resistance of the liquid and the like. Furthermore, for high-frequency and small-amplitude vibrations (50 to 100 Hz) that may occur with shake vibrations, the liquid spring resonates within the orifice 53 and the dynamic spring constant decreases, and Absorbed.
[0063]
When the controller 100 determines that the vehicle speed has shifted from the high speed range to the low speed range and the vibration state has changed from the shake vibration generation state to the idle vibration generation state, the drive current is supplied from the power cable 105 to the power cable 103. Switch. As a result, the drive current is supplied to the motor 88 via the leaf spring 93 and the contact member 96 that are in electrical communication with the power cable 105. As a result, the drive current is supplied to the motor 88 via the leaf spring 92 and the contact member 95 that are in electrical communication with the power cable 103.
[0064]
The motor 88 is rotated by the drive current from the power cable 103, and the worm wheel 72 connected to the motor 88 rotates in the direction of arrow C from the position shown in FIG. At this time, the rotary valve 41 connected to the worm wheel 72 by the valve drive shaft 70 also rotates integrally with the worm wheel 72 from the second position shown in FIG. When the worm wheel 72 is rotated to the position shown in FIG. 6, the leaf spring 92 is elastically deformed by the first cam portion 98 and the leaf spring 92 and the contact member 95 are separated from each other. Thereby, the drive current to the motor 88 is interrupted and the motor 88 stops. At this time, the rotary valve 41 stops at the first position shown in FIG. 1 to close the sparge orifice 53 and allows the main liquid chamber 27 to communicate with the idle orifice 48.
[0065]
As a result, the shake orifice 34 that is always open communicates the main liquid chamber 27 and the first sub liquid chamber 28, and the idle orifice 48 communicates the main liquid chamber 27 and the second sub liquid chamber 29. As a result, the liquid moves between the main liquid chamber 27 and the first sub liquid chamber 28 via the idle orifice 48 having a small passage resistance, and the liquid spring resonates in the idle orifice 48 to reduce the dynamic spring constant. The vibration is absorbed. Furthermore, since the shake orifice 34 that connects the main liquid chamber 27 and the first sub liquid chamber 28 is always open, the liquid can also flow to the shake orifice 34 side. Accordingly, the first diaphragm 14 can be deformed by vibration in a low frequency region similar to shake vibration that may occur together with idle vibration. Accordingly, the first diaphragm 14 is deformed, and the vibration in the low frequency region that may occur simultaneously with the vibration of the idle vibration is caused by the shake orifice 34 that communicates between the main liquid chamber 27 and the first sub liquid chamber 28. Can be attenuated.
[0066]
According to the vibration isolator 10 of the present embodiment described above, the first cam portion 98 corresponding to the idle orifice 48 and the second cam portion 99 corresponding to the boom orifice 53 are connected to the worm wheel 72 connected to the rotary valve 41. When the leaf springs 92 and 93 are bent and deformed along the first cam portions 98 and 99 and separated from the contact members 95 and 96, the motor switch 91 stops the motor 88, whereby the leaf springs 92 and 93 When the bending deformation, which is a mechanical motion, occurs, the motor 88 that rotates the rotary valve 41 is stopped. Therefore, cam portions 98 and 99 are provided in the worm wheel 72 in advance so that the dimensional accuracy and the positional accuracy are sufficiently high. In this case, the orifices 48 and 5 are arranged so that only one of the idle orifice 48 and the sparge orifice 53 communicates with the main liquid chamber 27. When switching the opening and closing state of the can stop accurately rotary valve 41 to the position corresponding to the open or closed state of a desired orifice 48, 53.
[0067]
Further, even if the number of switching of the orifices 48 and 53 by the rotary valve 41 is increased, the cam portions 98 and 99 are made of a material having sufficient wear resistance and strength so that the outer shape of the cam portions 98 and 99 does not change due to wear or the like. Since the stop timing of the motor 88 by the motor switch 91 can be prevented from changing with time, the accuracy of the stop position of the rotary valve 41 can be prevented from decreasing with time.
[0068]
Next, a modified example of the motor switch 110 in the vibration isolator 10 of the present embodiment will be described with reference to FIGS. Members having basically the same configuration and function as those described based on the motor switch 91 shown in FIGS. 6 and 7 are denoted by the same reference numerals and description thereof is omitted.
[0069]
The motor switch 110 shown in FIGS. 8 and 9 is disposed in the storage chamber 64 in the same manner as the motor switch 91 shown in FIGS. 6 and 7. As shown in FIGS. 8 and 9, the motor switch 110 includes two thin plate-like leaf springs 112 and 113 supported so as to face the cam surface 111 formed on the lower surface of the worm wheel 72. The leaf springs 112 and 113 are each formed of a conductive and elastic material, such as a phosphor bronze plate, and the leaf springs 92 and 93 are separated by a terminal box 94 installed on the printed wiring board 81. Supported by holding state.
[0070]
The leaf springs 112 and 113 are supported so that the base end portions 112A and 113A connected to the terminal box 94 are parallel to the lower surface of the worm wheel 72, as shown in FIGS. 8B and 9B. ing. The sliding ends of the leaf springs 112 and 113 are bent in a substantially V shape from the distal ends of the base end portions 112A and 113A, and the V-shaped bent tops are pressed against the cam surface 111 of the worm wheel 72. Contact portions 112B and 113B are formed.
[0071]
The terminal box 94 supports the contact members 95 and 96 between the leaf springs 112 and 113 and the printed wiring board 81 so as to face the leaf springs 112 and 113, respectively. Each of these contact members 95 and 96 includes a pair of contact plates 95A and 96A.
[0072]
The cam surface 111 of the worm wheel 72 has an axis S as shown in FIGS.₁The first cam portion 114 and the second cam portion 115 are formed in two regions that are different from each other in the radial direction. These cam portions 114 and 115 are formed integrally with a worm wheel 72 made of a non-conductive material, and are recessed so as to be separated from the plate springs 112 and 113 from the flat cam surface 111.
[0073]
Here, the first cam portion 114 disposed on the outer peripheral side has an axis S as shown in FIG.₁Axis center S₁To the leaf spring 112 along a circular locus having a radius. The first cam portions 114 are respectively provided at two positions whose phase angles are different from each other by 180 ° in the circumferential direction, and are formed in a belt shape whose width in the radial direction is constant when viewed from the axial direction. Further, as shown in FIG. 8B, the first cam portion 114 has an axis S.₁Is formed in a substantially trapezoidal shape, the circumferential central portion is a flat surface 114A formed of a plane parallel to the cam surface 111, and both circumferential end portions connect the cam surface 111 and the flat surface 114A, respectively. It is set as the inclined surface 114B.
[0074]
On the other hand, the second cam portion 115 disposed on the inner peripheral side has an axis S as shown in FIG.₁Axis center S₁To the leaf spring 113 along a circular locus having a radius. The second cam portions 115 are respectively provided at two positions whose phase angles are different from each other by 180 ° in the circumferential direction, and are formed in a belt shape whose width in the radial direction is constant when viewed from the axial direction. Further, as shown in FIG. 9B, the second cam portion 115 has an axis S.₁Is formed in a substantially trapezoidal cross section, and the circumferential center portion is a flat surface 115A formed of a plane parallel to the cam surface 111, and both circumferential end portions are inclined to connect the cam surface 111 and the flat surface 115A. It is set as the surface 115B. The two first cam portions 114 and the second cam portions 115 have a circumferential phase angle of 90 ° different from each other, and the depths from the cam surface 111 to the flat surfaces 115A and 114A are equal to each other. Is provided.
[0075]
As shown in FIGS. 8C and 9B, the leaf springs 112 and 113 are deformed by a height H along the axial direction when the sliding contact portions 112B and 113B are pressed by the cam surface 111. . Here, the height H is a distance shorter than the depth of the cam portions 114 and 115.
[0076]
In the motor switch 110 configured as described above, one of the leaf springs 112 and 113 is always inserted into the cam portions 114 and 115 when the motor 88 is stopped. Here, as shown in FIG. 8B, the worm wheel 72 is stopped at the first position described above, and the sliding contact portion 112B of the leaf spring 112 on the outer peripheral side is inserted into the cam portion 114. When the flat portion 114A faces the flat portion 114A, the leaf spring 112 is restored and separated from the contact member 95. When the worm wheel 72 is stopped at the first position, the leaf spring 113 on the inner peripheral side is pressed by the cam surface 111 as shown in FIG. Contact.
[0077]
On the other hand, as shown in FIG. 9, when the worm wheel 72 is stopped at the second position described above, the sliding contact portion 113B of the leaf spring 113 on the inner peripheral side is inserted into the cam portion 115 and is flat. It faces the part 115A. As a result, the leaf spring 113 is restored and the leaf spring 113 is separated from the contact member plate 96. At this time, the leaf spring 112 on the outer peripheral side is pressed by the cam surface 111 to bend and deform. As a result, the leaf spring 112 contacts the contact member 95.
[0078]
In the motor switch 110 configured as described above, the leaf springs 112 and 113 are restored from bending deformation, which is a mechanical motion, so that the rotary valve 42 communicates the main liquid chamber 27 with the idle orifice 48 in the first. , Or the second position where the rotary valve 42 communicates with the main orifice 27 for the main liquid chamber 27, and the drive current to the motor 88 can be cut off in synchronism with this. Therefore, if the cam portions 114 and 115 are provided in the worm wheel 72 so that the dimensional accuracy and the positional accuracy are sufficiently high in advance, only one of the idle orifice 48 and the buoyancy orifice 53 communicates with the main liquid chamber 27. When switching the open / close state of the orifices 48 and 53, the rotary valve 41 can be accurately stopped at a position corresponding to the desired open / close state of the orifices 48 and 53.
[0079]
Further, even if the number of switching of the orifices 48 and 53 by the rotary valve 41 is increased, the cam portions 114 and 115 are made of a material having sufficient wear resistance and strength so that the outer shape of the cam portions 114 and 115 does not change due to wear or the like. Since the stop timing of the motor 88 by the motor switch 91 can be prevented from changing with time, the accuracy of the stop position of the rotary valve 41 can be prevented from decreasing with time.
[0080]
【The invention's effect】
As described above, according to the vibration isolator of the present invention, when the valve is operated by the motor and the open / close state of the liquid passage is switched, it is possible to prevent a decrease in accuracy of the motor stop timing and a malfunction due to the motor switch.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where a rotary valve of a vibration isolator according to an embodiment of the present invention communicates a main liquid chamber and an idle orifice.
FIG. 2 is a cross-sectional view showing a state in which a rotary valve of a vibration isolator according to an embodiment of the present invention communicates a main liquid chamber and a bulking orifice.
FIG. 3 is an exploded perspective view showing a vibration isolator according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view along the axis of a valve drive shaft showing the internal structure of the motor unit of the vibration isolator according to the embodiment of the present invention.
FIG. 5 is a cross-sectional view perpendicular to the axis of the valve drive shaft showing the internal structure of the motor unit of the vibration isolator according to the embodiment of the present invention.
6A and 6B are a plan view and a side cross-sectional view showing an example of a motor switch according to an embodiment of the present invention, in which the motor switch stops a rotary valve at a position corresponding to an idle orifice.
FIGS. 7A and 7B are a plan view and a side cross-sectional view showing an example of a motor switch according to an embodiment of the present invention, in which the motor switch stops a rotary valve at a position corresponding to a squeezing orifice. FIGS.
FIGS. 8A and 8B are a plan view and a side cross-sectional view showing a modified example of the motor switch according to the embodiment of the invention, in which the motor switch stops the rotary valve at a position corresponding to the idle orifice.
FIGS. 9A and 9B are a plan view and a side cross-sectional view showing a modified example of the motor switch according to the embodiment of the present invention, in which the motor switch stops the rotary valve at a position corresponding to the orifice for the accumulation. FIGS.
FIGS. 10A and 10B are a plan view and a side sectional view showing an example of a motor switch for stop control for a rotary valve used in a conventional vibration isolator. FIGS.
[Explanation of symbols]
10 Vibration isolator
13 Outer tube bracket (outer tube)
42 Inner tube bracket (inner tube)
25 Elastic body
27 Main liquid chamber
28 1st sub liquid chamber
29 Second secondary liquid chamber
34 Shake orifice (liquid passage)
41 Rotary valve (valve)
48 Idle orifice (liquid passage)
53 Orifice for cedar
72 Worm wheel (rotating body)
88 motor
91 Motor switch
92, 93, 112, 113 Leaf spring (spring member)
95,96 Contact member

Claims (4)

An outer cylinder connected to one of the vibration generator and the vibration receiver;
An inner cylinder connected to the other of the vibration generating part and the vibration receiving part and disposed inside the outer cylinder;
An elastic body disposed between the outer cylinder and the inner cylinder;
A main liquid chamber in which a liquid is sealed with the elastic body as a part of a partition wall, and an internal volume is changed by deformation of the elastic body;
A sub-liquid chamber in which at least a part of the partition wall is elastically deformable and in which a liquid is enclosed;
A plurality of liquid passages connecting between the main liquid chamber and the sub liquid chamber;
Valves that open and close each of the plurality of liquid passages by rotating around a rotation axis ;
A motor connected to the valve and rotating to switch the open / close state of the plurality of liquid passages to operate the valve;
The coupled to the valve such that the valve coaxially with said rotating in the valve and integral cam portion of the concave or convex is provided at positions corresponding to the plurality of liquid passages in the rotational axis A rotating body,
A motor switch for stop control that supports a flexible spring member so as to be elastically deformed or restored along the cam portion, and stops the motor when the spring member is elastically deformed or restored along the cam portion;
A vibration isolator.   The cam portion provided on the rotating body includes a first cam portion provided at two positions whose phase angles are different from each other by 180 ° and a second cam portion provided at two positions whose phase angles are different from each other by 180 °. The first cam portion and the second cam portion are arranged at positions where the phases are different from each other by 90 °.
  The vibration isolator according to claim 1.   The motor switch includes a contact member that comes into contact with the spring member and becomes conductive, and the spring member elastically deforms or restores along the cam portion and contacts or separates from the spring member. The vibration isolator according to claim 1 or 2.   The anti-rotation device according to any one of claims 1 to 3, wherein the rotating body includes at least one gear that forms a gear train that connects the motor to the valve so as to transmit torque. Shaker.

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