JP6446305B2 - Clutch mechanism and motor unit for washing machine - Google Patents

Description

  The present invention relates to a clutch mechanism and a motor unit for a washing machine including the clutch mechanism.

  Patent Documents 1 and 2 below disclose a washing machine motor unit that includes a clutch mechanism that interrupts transmission of driving force from a motor to a rotating tub.

  The clutch operating mechanism that operates the clutch 14 of Patent Document 1 is driven from the drive motor 10 to the inner tub 6 by moving the sleeve 54 up and down with the operating lever 66 and engaging and separating the sleeve 54 with the locking bracket 74. To interrupt power transmission. The sleeve 54 is rotatably supported by the fork portion 80 of the operating lever 66, and the sleeve 54 moves in the vertical direction when the actuator 65 swings the operating lever 66.

  In the clutch mechanism 7 of Patent Document 2, the support member 34 on which the second rotator 20 is rotatably supported is moved up and down by the support member moving mechanism 35, and the second rotator 20 is engaged with and separated from the first rotator 13. By doing so, transmission of the driving force from the motor 5 to the laundry basket 3 is interrupted. The support member 34 is rotated in the circumferential direction by the synchronous motor 37 of the support member moving mechanism 35 and its reduction gear train 63, and further moves in the vertical direction together with the second rotating body 20 by the action of the cam mechanism 39.

JP 2003-210892 A JP 2014-068854 A

  In the clutch mechanism of Patent Document 1, the operating lever 66 provided outside the clutch 14 is swung by the actuator 65 also provided outside the clutch 14, so that a large installation space for the clutch operating mechanism is required. Also, the installation work becomes complicated.

  The clutch mechanism 7 of Patent Document 2 can be attached in a smaller space than the clutch operation mechanism of Patent Document 1. However, since the clutch mechanism 7 of Patent Document 2 uses the synchronous motor 37 that rotates only in one direction, the clutch disengaged state and the disengaged state must be repeated in sequence, and the clutch disengaged state is unknown. , It is not possible to switch directly to the desired state. Therefore, the clutch mechanism 7 of Patent Document 2 is separately provided with a detection mechanism 40 using a tact switch 71 and a washing tub rotation detection device 8 using a Hall IC 85, and disconnection is performed while determining the state of the clutch. I have control.

  The motor 5 of Patent Document 2 is arranged separately from the clutch mechanism 7. For example, when the motor 5 is a direct drive motor and the clutch mechanism 7 is accommodated therein, the space inside the motor is not sufficient. Since it is divided into parts such as a stator, the restriction on the arrangement space of the clutch mechanism 7 becomes more severe. When the clutch mechanism 7 is accommodated in such a narrow arrangement space, the sizes of the synchronous motor 37, the reduction wheel train 63, the detection mechanism 40, the washing tub rotation detection device 8 and the like constituting the clutch mechanism 7 become a problem. .

  In view of the above problems, the problem to be solved by the present invention is a clutch mechanism that can be arranged even in a narrow arrangement space, and that can directly switch the clutch disengagement state. The object is to provide a motor unit for a washing machine in which a clutch mechanism is housed.

  In order to solve the above problems, a clutch mechanism according to the present invention includes a first rotating body and a second rotating body that are coaxially arranged and engageable with each other, and the second rotating body is displaced in the axial direction. A lift mechanism that switches engagement / separation between the second rotating body and the first rotating body, and a case in which the second rotating body and the lift mechanism are accommodated. A second motor rotatable in both directions, the second motor including a cylindrical second rotor and a second stator, and the second rotating body includes the second rotor and the second rotor The gist is that it is arranged inside the second stator.

  By disposing the second rotating body inside the second motor that is the driving source of the clutch mechanism, the number of parts for transmitting the output of the driving source to the second rotating body can be minimized. As a result, the clutch mechanism can be reduced in size, and the reliability can be improved by reducing the number of parts.

  In the clutch mechanism of the present invention, the lift mechanism further displaces the frame member in the axial direction according to the rotation direction of the second motor and the frame member that rotatably supports the second rotating body. A cam mechanism to be arranged, and the frame member and the cam mechanism may be further arranged inside the second rotor and the second stator.

  The lift mechanism includes a frame member and a cam mechanism, and these are arranged inside the second rotor and the second stator, whereby the mechanism necessary for the clutch mechanism to displace the second rotating body in the axial direction. All of these can be accommodated inside the second rotor and the second stator. Thereby, the external shape of a clutch apparatus can be made into the disk shape or column shape without the protrusion part to an axial direction or radial direction.

  In the clutch mechanism of the present invention, it is preferable that the second motor is a stepping motor.

  By using a stepping motor, the rotation angle can be controlled by the number of steps, so there is no need to provide a mechanism for determining the lifting / lowering state of the frame member and a feedback mechanism for the motor rotation number, and the clutch mechanism can be made compact. Can be achieved. Furthermore, the stepping motor is highly reliable because it has few contact parts.

  In the clutch mechanism of the present invention, the second motor is an inner rotor type motor, the frame member is supported by the case so as not to rotate in the circumferential direction, and the cam mechanism is formed on the outer peripheral surface of the frame member. It is good also as a structure which consists of the protrusion part which is the provided cam follower, and the helical cam groove provided in the internal peripheral surface of said 2nd rotor in which this protrusion part is inserted.

  By providing the cam mechanism directly on the frame member and the second rotor, the number of parts can be reduced as compared with a configuration in which a separate cam mechanism is provided. As a result, the clutch mechanism can be further reduced in size and improved in reliability.

  In the clutch mechanism of the present invention, it is desirable that the second rotor is supported by a roller member or a ball member provided in the case so as to be rotatable in the circumferential direction.

  By using a roller member or ball member having a small contact area and a low frictional resistance for the bearing structure of the second rotor, the second rotor can be rotated with a smaller force.

In the clutch mechanism of the present invention, the fixed-side teeth projecting toward the second rotating body at a portion of the case where the second rotating body spaced apart from the first rotating body contacts the axial direction thereof. A fixed-side tooth portion that meshes with the fixed-side tooth portion is formed at a portion of the second rotating body that faces the fixed-side tooth portion , and the second rotating body is in a separated position thereof. The fixed side tooth portion and the fixed side tooth portion mesh with each other so as to be non-rotatably locked to the case, and the frame member includes an inner peripheral portion that supports the second rotating body, An outer peripheral portion that supports an inner peripheral portion, the outer peripheral portion supports the inner peripheral portion in an axial direction via a biasing member, and the inner peripheral portion is supported by the biasing member. , at least the height of the fixation-side tooth part, in the axial direction with respect to the outer peripheral portion Much possible it is desirable that.

  During the washing operation of the washing machine, it is necessary to prevent unnecessary rotation of the rotating tub due to the rotation of the second rotating body due to friction or the flow of washing water. By providing the case and the second rotating body with the fixed side tooth portion and the fixed side tooth portion, the rotation of the second rotating body separated from the first rotating body is locked by the case, and the rotating tub is fixed. The Here, when the fixed side tooth portion and the fixed side tooth portion are not meshed with each other and the apexes are in contact with each other, not only can the rotation tank fixing effect by these tooth portions be obtained, but also the first The force that raises the second rotating body causes stress on the lift mechanism, which may cause damage to the lift mechanism. In addition, when a stepping motor is used for the second motor, the second motor may step out. By adopting a configuration in which the inner peripheral portion of the frame member can be displaced in the axial direction by the biasing member, the inner peripheral portion (and the second rotating body) even when the apexes of these tooth portions abut against each other during the clutch disengagement operation. ) Is temporarily absorbed by the biasing member, so that only the outer peripheral portion can be moved to the axial position at the time of separation. Thereafter, when the second rotating body rotates slightly in the circumferential direction and the state where the apexes of the tooth portions abut each other is resolved, the inner circumferential portion is moved to its original position (fixed side) by the biasing force of the biasing member. Returning to the initial position on the tooth side, the tooth parts mesh with each other. By adopting such a configuration, it is possible to avoid breakage of the lift mechanism due to the clutch disengagement operation and to suppress rotation of the rotating tub.

  The motor unit for a washing machine of the present invention includes a first motor, the first motor includes a cylindrical first rotor and a first stator, and the first rotor and the first motor The clutch mechanism according to any one of claims 1 to 6 is arranged inside the stator of the first and second aspects, and the first rotating body is rotationally driven by the first motor. To do.

  The clutch device of the present invention can save space by having the above-described configuration. By accommodating the clutch device inside the first motor, the arrangement space of the clutch device can be further reduced, and the operation of attaching the washing machine motor unit to the washing machine can be simplified. In particular, since the outer shape of the clutch mechanism of the present invention can be a disc shape or a cylindrical shape, it is suitable for being arranged inside the cylindrical first rotor and the first stator. On the other hand, when the clutch mechanism breaks down in such a configuration, the clutch mechanism is housed inside the first motor, so that repair and replacement may be complicated. In the clutch mechanism according to the present invention, the number of parts is reduced and the failure rate is suppressed. Therefore, the above disadvantageous effect is compensated, and the advantageous effect of reducing the arrangement space becomes remarkable.

  In the washing machine motor unit of the present invention, a rotating shaft that rotates integrally with the first rotating body is erected at the rotation center of the first rotating body, and the rotating shaft is splined on the outer peripheral surface. The tip of the rotating shaft is exposed from the cylindrical shaft, and the second rotating body is fitted into the spline portion, so that the spline portion of the spline portion is inserted. It is movable in the axial direction and rotates integrally with the cylindrical shaft in the circumferential direction. When the first rotating body and the second rotating body are engaged, the driving force of the first motor The rotating shaft and the cylindrical shaft may rotate, and when the first rotating body and the second rotating body are separated from each other, only the rotating shaft may be rotated by the driving force of the first motor.

  According to the clutch mechanism and the washing machine motor unit according to the present invention, the clutch mechanism can be arranged even in a narrow arrangement space, and can directly switch the clutch disengagement state, and A motor unit for a washing machine in which such a clutch mechanism is accommodated can be provided.

It is sectional drawing which shows schematic structure of the fully automatic electric washing machine provided with the motor unit for washing machines of this invention. It is an external appearance perspective view of a motor unit. It is a disassembled perspective view of a motor unit and a clutch mechanism. It is a perspective view explaining the raising / lowering operation of the frame member by a lift mechanism. It is sectional drawing explaining the raising / lowering operation of the frame member by a lift mechanism.

  Hereinafter, embodiments of a clutch mechanism according to the present invention and a motor unit for a washing machine including the clutch mechanism will be described with reference to the drawings. The motor unit for the washing machine according to the present embodiment is mounted on a spiral type fully automatic electric washing machine, and the clutch mechanism performs both a washing operation for rotating only the pulsator according to the washing process of clothes, and both the pulsator and the rotating tub. Switching between rotating and dehydrating operations. Note that “upper”, “lower”, and “vertical direction” in the present embodiment refer to the vertical direction shown in FIG.

(overall structure)
FIG. 1 is a cross-sectional view showing a schematic configuration of a fully automatic electric washing machine 90 (hereinafter simply referred to as “washing machine 90”) according to the present embodiment. The washing machine 90 has a rectangular tube-shaped casing 91 having a cover 92 that can be opened and closed at an opening on the upper surface. Inside the casing 91 is a bottomed cylindrical inner tank that constitutes a washing and dehydrating tank 95. 95a and outer tub 95b and a washing machine motor unit 10 (hereinafter simply referred to as "motor unit 10") are accommodated. The outer tub 95b is suspended from the housing 91 by a suspension bar 93 having a buffer mechanism, and a drain pipe 94 for discharging washing water to the outside is connected to the bottom of the outer tub 95b. The inner tank 95a which is a rotating tank is rotatably supported in the outer tank 95b, and a pulsator 96 is installed at the center of the bottom surface.

  The pulsator 96 and the inner tub 95a are connected to the motor unit 10 disposed below the washing / dehydrating tub 95. The rotating shaft 20 of the motor unit 10 has a tip portion passing through the bottom surface of the inner tank 95 a and connected to the pulsator 96, and the pulsator 96 rotates integrally with the rotating shaft 20. The cylindrical shaft 21 of the motor unit 10 is connected to the lower surface of the inner tank 95 a via the connecting member 22, and the inner tank 95 a rotates integrally with the cylindrical shaft 21.

  The fixing member 23 of the motor unit 10 is attached to the lower surface of the outer tub 95b. The motor unit 10 includes a first motor 30, and a rotary shaft 20, a cylindrical shaft 21, and a clutch mechanism 40 described later are disposed inside a first rotor 31 of the first motor 30. The clutch mechanism 40 controls the rotation of the inner tank 95a by interrupting the transmission of the driving force from the first motor 30 to the cylindrical shaft 21.

  When clothes are put in from the opening of the washing machine 90 and the washing machine 90 starts a washing operation, washing water is supplied to the washing and dehydrating tank 95 through a water supply pipe (not shown). Thereafter, the rotary shaft 20 and the pulsator 96 are driven to rotate by the first motor 30 and the clothes are washed. During this time, transmission of the driving force to the cylindrical shaft 21 and the inner tank 95a is disconnected by the clutch mechanism 40.

  When the washing operation is completed and the washing water is discharged from the drain pipe 94 of the outer tub 95b, the washing machine 90 shifts to a dehydrating operation for dehydrating clothes. In the dehydrating operation, the driving force of the first motor 30 is transmitted also to the cylindrical shaft 21 by the clutch mechanism 40, and the pulsator 96 and the inner tank 95a rotate integrally.

(Configuration of motor unit)
FIG. 2 is an external perspective view of the motor unit 10. The first motor 30 provided in the motor unit 10 is a disk-shaped outer rotor type motor. The above-described clutch mechanism 40 is built in a space provided inside the cylindrical first rotor 31 and the first stator 32 of the first motor 30, and the clutch is provided outside the first motor 30. Space saving is achieved as compared with the configuration including the mechanism 40. The “cylindrical shape” in the present invention means a shape having a hollow cylindrical portion at least partially including a bottomed cylindrical shape and a cup shape. In addition, an outer rotor type motor is adopted as the first motor 30 in the present embodiment, but the same effect can be obtained even when the first motor 30 is an inner rotor type motor.

  A bearing 24 is disposed between the inner peripheral surface of the shaft portion of the fixing member 23 (transmission display) and the outer peripheral surface of the cylindrical shaft 21 to ensure smooth rotation of the cylindrical shaft 21. The distal end portion of the rotating shaft 20 is exposed from the opening of the cylindrical shaft 21, and the rotation of the rotating shaft 20 is transmitted to the pulsator 96 by connecting the exposed portion to the pulsator 96. Further, the connecting member 22 shown in FIG. 1 is mounted on the outer peripheral surface of the cylindrical shaft 21, and the rotation of the cylindrical shaft 21 is transmitted to the inner tank 95 a through the connecting member 22. The shape of the connecting member 22 can be changed as appropriate according to the shape of the washing and dewatering tub 95 to which the motor unit 10 is applied.

(Configuration of clutch mechanism)
FIG. 3 is an exploded perspective view of the motor unit 10 and the clutch mechanism 40. A disc-shaped first rotating body 41 is fixed to the center of rotation of the first rotor 31 of the first motor 30, and the first rotor 31 is driven to rotate, whereby the first rotating body 41 is driven. Rotates integrally with the first rotor 31.

  The clutch mechanism 40 includes a case 49 including an upper case 49a and a lower case 49b. Inside the case 49, a second rotating body 42 and a second rotating body 42, which are cylindrical members having flange portions, are provided. A lift mechanism 43 that moves in the axial direction and a coil spring 44 that constantly biases the second rotating body 42 downward are accommodated.

  The first rotator 41 and the second rotator 42 are arranged coaxially on the axis L. Clutch tooth portions 41a and 42a in which a plurality of ridges extending in the radial direction are arranged at equal intervals in the circumferential direction are formed on the opposing surfaces of the first rotating body 41 and the second rotating body 42. Similarly, in the portion of the upper case 49a where the second rotating body 42 contacts in the axial direction, a plurality of ridges extending in the radial direction (protrusions protruding toward the second rotating body 42) surround the periphery. Fixed side teeth 45a arranged at equal intervals in the direction are formed, and the fixed side, which is a protrusion that meshes with the fixed side teeth 45a, is formed on the portion of the second rotating body 42 that faces the fixed side teeth 45a. The tooth part 42c is formed.

  The lift mechanism 43 displaces the frame member 431 in the axial direction according to the rotation direction of the second motor 432, the frame member 431 that rotatably supports the second rotating body 42, and the second motor 432. A cam mechanism 433.

  The second motor 432 is a stepping motor, and is an inner rotor type motor composed of a cylindrical second rotor 432a and a second stator 432b. A second rotating body 42, a frame member 431, and a cam mechanism 433 are arranged inside the second rotor 432a of the second motor 432.

  The second rotor 432a is supported by a roller member 49c included in the case 49 so as to be rotatable in the circumferential direction. Four roller members 49c are provided in the upper case 49a and the lower case 49b, and four roller members 49c are arranged at equal intervals in the circumferential direction. The roller structure 49c having a small contact area and low frictional resistance is used for the bearing structure of the second rotor 432a, whereby the second rotor 432a can be rotated with a smaller force. The same effect can be obtained by using a ball member instead of the roller member 49c.

  The frame member 431 is a cylindrical member that includes an inner peripheral portion 431a that rotatably supports the second rotating body 42 and an outer peripheral portion 431b that supports the inner peripheral portion 431a. The outer peripheral portion 431b supports the inner peripheral portion 431a in the axial direction via a coil spring 431c that constantly biases the inner peripheral portion 431a upward, and the inner peripheral portion 431a is at least covered by the elastic deformation of the coil spring 431c. It can be displaced in the axial direction relative to the outer peripheral portion 431b by the height of the fixed side tooth portion 42c.

  The case 49 has four fixed shafts 49d provided upright at equal intervals in the circumferential direction. The circumferential angle of the outer peripheral portion 431b is fixed by inserting the fixed shaft 49d, and the circumferential position of the inner peripheral portion 431a is fixed by fitting the outer peripheral portion 431b. Thereby, the frame member 431 is supported by the case 49 so as not to rotate in the circumferential direction as a whole.

  A spline portion 21 a is provided on the outer peripheral surface of the lower end portion of the cylindrical shaft 21. A longitudinal groove corresponding to the protrusion of the spline portion 21a is carved on the inner peripheral surface 42b of the second rotating body 42. The cylindrical shaft 21 is inserted into the second rotating body 42, and the inner peripheral surface 42b of the second rotating body 42 and the spline portion 21a mesh with each other, so that the second rotating body 42 is within the range of the spline portion 21a. The cylindrical shaft 21 can be slid in the axial direction, and the second rotating body 42 and the cylindrical shaft 21 rotate integrally in the circumferential direction.

  In the vicinity of the lower end of the rotating shaft 20, a serration portion 20a is provided on the outer peripheral surface thereof. A longitudinal groove corresponding to the protrusion of the serration portion 20a is carved in the bearing 41b of the first rotating body 41. When the serration portion 20a is inserted into the bearing 41b and the serration portion 20a and the bearing 41b are engaged with each other, the first rotating body 41 and the rotary shaft 20 rotate integrally in the circumferential direction.

(Operation of lift mechanism)
4 and 5 are explanatory views of the lifting and lowering operation of the frame member 431 in the lift mechanism 43. FIG. In FIG. 4, the outer peripheral portion 431b of the frame member 431 is transparently displayed. FIG. 5 is a cross-sectional view taken along the line AA in FIG. The driving force is interrupted by the clutch mechanism 40 by moving the frame member 431 supporting the second rotating body 42 up and down to displace the axial position of the second rotating body 42. This is performed by engaging (joining) and separating (disengaging) the clutch tooth portions 41a and 42a of the first rotating body 41.

  In the present embodiment, the cam mechanism 433 includes a protrusion 433a that is a cam follower provided on the outer peripheral surface of the frame member 431 (the outer peripheral portion 431b), and an inner peripheral surface of the second rotor 432a into which the protrusion 433a is fitted. And a spiral cam groove 433b. Note that a pair of protrusions 433a are provided at symmetrical positions in the circumferential direction of the outer peripheral surface. The protrusion 433a in this embodiment is a roller, and the contact resistance between the protrusion 433a and the cam groove 433b is reduced.

  The cam mechanism 433 raises the frame member 431 by rotating the second rotor 432a clockwise as viewed in FIG. 4 (FIGS. 4A and 5A), and the second rotor 432a is viewed in FIG. By rotating counterclockwise, the frame member 431 is lowered (FIGS. 4B and 5B).

  In the present embodiment, a stepping motor that can rotate in both directions is used as the second motor 432 that is a drive source of the clutch mechanism 40, so that the rotation direction is designated and the clutch mechanism 40 is in a desired state. It is possible to switch directly to

  Further, since the rotation angle of the stepping motor can be controlled by the number of steps, it is not necessary to separately provide a mechanism for detecting the raising / lowering state of the frame member 431 and a feedback mechanism for the motor rotation number. Thereby, the number of parts is suppressed and the clutch mechanism 40 is reduced in size. Since the clutch mechanism 40 in the present embodiment is built in the first motor 30, there is a possibility that repair or replacement at the time of failure becomes complicated. Therefore, the failure rate of the clutch mechanism 40 is reduced by using a stepping motor with few contact parts and relatively high reliability, and further reducing the number of parts. Further, the outer shape of the clutch mechanism 40 in the present embodiment is a disk shape, and there is no portion projecting in the radial direction, so that it is suitable for being arranged inside the first rotor 31 and the first stator 32.

  4A and 5A show the state of the lift mechanism 43 during the washing operation of the washing machine 90. FIG. The clutch mechanism 40 is in a disengaged state during the washing operation. When the clutch mechanism 40 is in the disengaged state, the lift mechanism 43 is in a position after the frame member 431 is lifted, and the second rotating body 42 is also lifted by the frame member 431 and separated from the first rotating body 41. . Therefore, the engagement of the clutch tooth portions 41a and 42a of the first rotating body 41 and the second rotating body 42 is in a released state, and the driving force of the first motor 30 is not transmitted to the second rotating body 42 and the subsequent parts. .

  4B and 5B show the state of the lift mechanism 43 during the dehydrating operation of the washing machine 90. FIG. The clutch mechanism 40 during the dehydrating operation is in the connected state. The lift mechanism 43 when the clutch mechanism 40 is in the joint state is in a position where the frame member 431 is lowered, and the second rotating body 42 is also urged downward by the coil spring 44 and is lowered together with the frame member 431. Thereby, the clutch tooth portions 41a and 42a of the first rotating body 41 and the second rotating body 42 are engaged with each other, and the driving force of the first motor 30 is transmitted to the inner tank 95a. That is, when the clutch tooth portions 41a and 42a mesh with each other, the driving force of the first motor 30 causes the first rotor 31, the first rotating body 41, the second rotating body 42, the cylindrical shaft 21, and the connection. It is transmitted to the inner tank 95a through the member 22, and the inner tank 95a rotates.

  Since the rotary shaft 20 is fixed to the first rotary body 41 and rotates integrally with the first rotary body 41, the pulsator 96 connected to the rotary shaft 20 always rotates together with the first motor 30. . That is, the driving force of the first motor 30 is transmitted to the pulsator 96 via the first rotating body 41 and the rotating shaft 20 regardless of the meshing state of the clutch teeth 41a and 42a. The washing machine 90 rotates in both cases of the washing operation and the dehydrating operation.

(Inner tub fixing structure during washing operation)
Hereinafter, the inner tub fixing structure during the washing operation will be described with reference to FIG. During the washing operation of the washing machine 90 (when the clutch mechanism 40 is in the disengaged state), the inner tub 95a is prevented from rotating due to the rotation of the second rotating body 42 due to friction or the flow of washing water. There is a need. Therefore, the clutch mechanism 40 includes a fixed side tooth portion 45 a in the upper case 49 a and a fixed side tooth portion 42 c in the second rotating body 42, and the second rotating body 42 is separated from the first rotating body 41. When separated, the fixed side tooth portion 45a and the fixed side tooth portion 42c are engaged with each other, whereby the rotation of the second rotating body 42 is engaged with the upper case 49a, and the inner tank 95a is fixed in the circumferential direction.

  Here, when the fixed side tooth portion 45a and the fixed side tooth portion 42c do not mesh with each other and the apexes of the fixed side teeth portion 42c are in contact with each other, not only the fixing effect of the inner tank 95a can be obtained, but also the frame member 431 cannot be raised, and the second motor 432 may step out. In particular, the clutch mechanism 40 according to the present embodiment does not include a mechanism for determining the lifting / lowering state of the frame member 431 and a feedback mechanism for the motor rotation speed, and applies a pulse corresponding to a predetermined step + α to the second motor 432. Thus, since it is determined that the clutch disengagement operation has been completed, the step-out of the second motor 432 can be directly connected to the malfunction of the motor unit 10. Further, the force that raises the second rotating body 42 causes stress to the lift mechanism 43, and may cause damage to the lift mechanism 43.

  The outer peripheral portion 431b of the frame member 431 in the present embodiment supports the inner peripheral portion 431a in the axial direction via a coil spring 431c. As described above, the inner peripheral portion 431a can be displaced in the axial direction with respect to the outer peripheral portion 431b by at least the height of the fixed side tooth portion 42c when the coil spring 431c is elastically deformed. Accordingly, even when the apexes of the fixed side tooth portion 45a and the fixed side tooth portion 42c collide with each other, the inner peripheral portion 431a is temporarily displaced downward with respect to the outer peripheral portion 431b, thereby separating the outer peripheral portion 431b. It can be moved to the hour position. Thereafter, when the second rotating body 42 is slightly rotated in the circumferential direction and the apex of the fixed-side tooth portion 45a and the fixed-side tooth portion 42c abuts against each other, the inner peripheral portion 431a moves to the coil spring 431c. Due to the urging force, it returns upward (initial position on the fixed side tooth portion 45a side), and the fixed side tooth portion 45a and the fixed side tooth portion 42c mesh. By adopting the above configuration, it is possible to avoid the step-out of the second motor 432 and the breakage of the lift mechanism 43 when the clutch mechanism 40 is in the disengaged state, and to suppress the rotation of the inner tank 95a. Yes.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Motor unit 20 Rotating shaft 21 Cylindrical shaft 30 1st motor 31 1st rotor 32 1st stator 40 Clutch mechanism 41 1st rotating body 41b Bearing 42 2nd rotating body 42b Inner peripheral surface 42c Fixed side Tooth part 43 Lift mechanism 431 Frame member 431a Inner peripheral part 431b Outer peripheral part 431c Coil spring 432 Second motor 432a Second rotor 432b Second stator 433 Cam mechanism 433a Projection part 433b Cam groove 44 Coil spring 45a Fixed side tooth part 49 Case 49a Upper case 49b Lower case 49c Roller member 49d Fixed shaft

Claims (8)

A first rotating body and a second rotating body which are arranged on the same axis and engageable with each other;
A lift mechanism for displacing the second rotating body in the axial direction and switching engagement / separation between the second rotating body and the first rotating body;
A case in which the second rotating body and the lift mechanism are accommodated,
The lift mechanism includes a second motor rotatable in both directions,
The second motor includes a cylindrical second rotor and a second stator,
The clutch mechanism, wherein the second rotating body is disposed inside the second rotor and the second stator. The lift mechanism further includes
A frame member that rotatably supports the second rotating body;
A cam mechanism for displacing the frame member in the axial direction according to the rotation direction of the second motor,
The clutch mechanism according to claim 1, wherein the frame member and the cam mechanism are further arranged inside the second rotor and the second stator.   The clutch mechanism according to claim 1 or 2, wherein the second motor is a stepping motor. The second motor is an inner rotor type motor,
The frame member is supported by the case so as not to rotate in the circumferential direction,
The cam mechanism includes a protrusion that is a cam follower provided on the outer peripheral surface of the frame member, and a spiral cam groove provided on the inner peripheral surface of the second rotor into which the protrusion is inserted. The clutch mechanism according to claim 2 or 3, characterized by comprising:   The clutch mechanism according to any one of claims 1 to 4, wherein the second rotor is rotatably supported in a circumferential direction by a roller member or a ball member provided in the case. . In the case, in the portion where the second rotating body spaced apart from the first rotating body contacts in the axial direction, a fixed side tooth portion protruding toward the second rotating body side is formed,
In the portion facing the fixed side tooth portion in the second rotating body, a fixed side tooth portion meshing with the fixed side tooth portion is formed,
The second rotating body is non-rotatably locked to the case by meshing the fixed side tooth portion and the fixed side tooth portion at the separated position,
The frame member is
An inner periphery supporting the second rotating body;
A cylindrical member provided with an outer peripheral part that supports the inner peripheral part,
The outer peripheral portion supports the inner peripheral portion in the axial direction via a biasing member,
The said inner peripheral part can be displaced to the axial direction with respect to the said outer peripheral part at least by the height of the said fixed side tooth | gear part by the said urging | biasing member, Any one of Claim 2-5 The clutch mechanism according to claim 1. With a first motor,
The first motor has a cylindrical first rotor and a first stator,
The clutch mechanism according to any one of claims 1 to 6 is disposed inside the first rotor and the first stator,
The first rotating body is driven to rotate by the first motor. A rotating shaft that rotates integrally with the first rotating body is erected at the rotation center of the first rotating body,
The rotating shaft is inserted through a cylindrical shaft having a spline portion formed on the outer peripheral surface,
The tip of the rotating shaft is exposed from the cylindrical shaft,
The second rotating body is movable in the axial direction of the spline portion by being fitted to the spline portion, and rotates integrally with the cylindrical shaft in the circumferential direction,
When the first rotating body and the second rotating body are engaged, the rotating shaft and the cylindrical shaft are rotated by the driving force of the first motor,
8. The washing machine motor unit according to claim 7, wherein when the first rotating body and the second rotating body are separated from each other, only the rotating shaft is rotated by the driving force of the first motor.

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