JP3391338B2 - Washing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine in which washing and rinsing are performed by a stirring blade rotating at a low speed, and dehydration is performed by a high-speed rotation of a dehydrating tub. 2. Description of the Related Art A conventional washing machine has a configuration as shown in FIG. That is, reference numeral 2 denotes a receiving cylinder suspended semi-constrained by a plurality of suspensions 3 on the main body 1. Further, the receiving cylinder 2 has a dehydration tub 7 (hereinafter simply referred to as a dehydration tub 7) in which the upper end side of the dehydration shaft 4 is fixed and which is also rotated by the dehydration shaft 4. A plurality of water passage holes 5 are provided on the side surface of the dewatering tank 7, and a fluid balancer 6 is provided at the upper opening. The dewatering tub 7 can be loaded with laundry through an upper opening. [0003] 8 is provided at the bottom of the dewatering tank 7,
This is a bearing that supports. Reference numeral 9 denotes a washing shaft disposed inside the hollow dewatering shaft 4, which is provided so as to be coaxial with the dewatering shaft 4. A stirring blade 10 rotatably arranged at the bottom of the dewatering tub 7 is attached to an upper end of the washing shaft 9, and a rotor 12 of a drive motor 11 is connected to a lower end of the washing shaft 9. The drive motor 11 includes a rotor 12 and a stator 13 provided opposite to a magnet provided on the outer periphery of the rotor 12. The rotor 12 rotates by a rotating magnetic field of the stator 13. A clutch 14 is provided between the lower end of the dehydrating shaft 4 and the rotor 12, and the rotation of the rotor 12 is transmitted to the dehydrating shaft 4 by switching the clutch.
Not communicate. In the washing and rinsing process, the clutch 14 is switched to disconnect the spinning shaft 4 from the rotor 12 so that the rotation of the rotor 12 of the drive motor 11 is rotated via the washing shaft 9 by the stirring blade 10. Only to be transmitted to the laundry, giving mechanical power to the laundry. Thus, washing and rinsing of the laundry stored in the dewatering tub 7 progresses. In the dewatering process, the water in the dewatering tank 7 is discharged, the clutch 14 is switched, and the dewatering shaft 4 and the rotor 1 are rotated.
2 is connected to the rotor 1 of the drive motor 11.
The washing shaft 9, the dewatering shaft 4 and the dewatering tub 7 connected to the whole 2 rotate. The water content of the laundry that has been washed and rinsed by the rotation of the dewatering tub 7 is removed by centrifugal force.
Are squeezed out into the receiving cylinder 2 from the water passage holes 5 provided on a large number of the side surfaces. The laundry is thus dehydrated. The rotating shaft of the drive motor 11 and the dewatering tub 7
The center of gravity of the dewatering tub 7 and the receiving cylinder 2 and the center of gravity of the drive motor 11 substantially coincide with each other by arranging on the same axis as the rotation center of. I can do it. [0007] However, in the washing machine having the above-mentioned conventional construction, the driving motor 11 directly rotates the stirring blades 10, so that the torque of the driving motor 11 is required to rotate the stirring blades 10. Must be increased, and the drive motor 11 needs to be increased in size. In particular, when the size of the stirring blade 10 is increased in accordance with an increase in the washing capacity, the torque for rotating the stirring blade 10 increases, and the driving force is also increased in order to increase the stirring power of the laundry and improve the cleaning power. Motor 11
Must be increased, and the increase in the size of the drive motor 11 cannot be avoided. During the stirring operation of the stirring blade 10, the laundry collides with the stirring blade 10, so that the washing shaft 9 to which the stirring blade 10 is connected receives an eccentric force F, and the lower end of the washing shaft 9 is connected. The rotor 12 of the drive motor 11 is also eccentric in the direction F1.
It was necessary to increase the gap S between the two. Therefore, there is a problem that the outer shape of the drive motor 11 becomes large and the mountability of the drive motor 11 becomes poor. If the gap between the rotor 12 and the stator 13 is large,
However, since the torque for rotating the rotor 12 also decreases, a configuration contradictory to increasing the torque has to be adopted. An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a washing machine which can cope with an increase in washing capacity without increasing the size of a drive motor. [0010] In order to achieve the above object, the present invention provides a dehydrating shaft including a speed reduction mechanism.
The bearing for fixing the dewatering shaft is provided inside the lower part.
A case, and a lower periphery of the case is recessed toward the center axis.
To form a recess, and the drive motor is installed in the recess.
An attachment portion is provided. According to this configuration, since the rotation speed of the drive motor is reduced by the speed reduction mechanism to rotate the stirring blades, without increasing the torque of the drive motor,
The rotation torque of the stirring blade can be increased. Also,
Even if the laundry collides with the stirring blades, the eccentricity of the washing shaft is absorbed by the speed reduction mechanism, and the eccentricity of the speed reduction mechanism to the washing-side input shaft can be suppressed, and the eccentricity of the rotor connected to the input shaft can also be suppressed. The gap between the rotor and stator can be reduced.
it can. [0011] According to a first aspect of the present invention in order to achieve the above object, an embodiment of the invention, the dewatering shaft for rotating the washing and dewatering tank, disposed in the washing and dewatering the water tank Rotating the stirring blade, and a washing shaft arranged coaxially with the spinning shaft, a drive motor for rotating the spinning shaft and the washing shaft, and switching so as to transmit the rotation of the drive motor to the spinning shaft. a clutch mechanism, a reduction mechanism by a planetary gear to rotate the washing shaft by decelerating the rotation of said drive motor, said down
A dehydrating shaft including a speed mechanism, and
A case provided with a bearing to be fixed on the inside of the lower part,
The clutch mechanism has a fixed clutch portion formed with a plurality of meshes on an outer peripheral side from an axis of a rotor of the drive motor, a movable clutch portion engaged with the fixed clutch portion , and a clutch drive portion , together constitute a so that switching the rotation transmission of the drive motor to the dewatering shaft by moving the movable clutch part in the vertical direction, the recess by depressing the central axis side of the lower outer periphery of the Ke <br/> over scan Form a part,
It is provided with a mounting portion of the drive motor to the recess. According to this configuration, the rotation speed of the drive motor is reduced by the speed reduction mechanism to rotate the stirring blade, so that the rotation torque of the stirring blade can be increased without increasing the torque of the drive motor. Also, even if the laundry collides with the stirring blade, the eccentricity of the washing shaft is absorbed by the speed reduction mechanism, so that the eccentricity of the speed reduction mechanism toward the input shaft on the washing side can be suppressed, and the eccentricity of the rotor connected to the input shaft can be suppressed. And the gap between the rotor and the stator can be reduced . Further, since a clutch mechanism for transmitting or not transmitting the rotation of the drive motor to the spinning shaft is provided, the spinning shaft does not transmit the rotation of the spinning motor at the time of washing. Is not transmitted to Further, since the dewatering bearing for supporting the dewatering shaft is provided, even if the dewatering shaft receives an eccentric force during dewatering, the eccentricity of the drive motor to the rotor can be suppressed, and the eccentric force of the washing shaft during washing. However, since the eccentric force is first received by the washing bearing, the eccentricity of the rotor can be further suppressed . Also, a case is provided that includes a dewatering shaft and has a bearing that supports the dewatering shaft. The lower periphery of the case is depressed toward the center of the shaft, and a mounting portion for a drive motor is provided in the depressed portion. The drive motor is close to the case.
As a result , the length of the washing-side input shaft can be reduced. (Embodiment 1) A first embodiment of the present invention will be described with reference to FIGS.
First, the overall configuration will be described with reference to FIG. A receiving cylinder 23 suspended by a suspension 22 is provided in the main body 21, and the vibration during dehydration is absorbed by the suspension 22. In the receiving cylinder 23, a spin-drying tub 24 (hereinafter simply referred to as a spin-drying tub 24) also serving as a washing tub is rotatably arranged. The dewatering tub 24 is provided with a stirring blade 25 for stirring the laundry at the inner bottom so as to be freely rotatable. Reference numeral 27 denotes a hollow dehydrating shaft, which is a dehydrating bearing 26 provided at the bottom center of the receiving cylinder 23.
Is supported by The upper end side of the dehydration shaft 27 is fixed to the bottom of the dehydration tub 24, and rotates the dehydration tub 24.
Reference numeral 29 denotes a washing shaft whose upper end is fixed to the stirring blade 25 so that the stirring blade 25 rotates.
Are arranged coaxially with each other in a hollow portion of the dehydrating shaft 27 and are supported by a washing bearing 28 provided in the hollow portion of the dehydrating shaft 27. Reference numeral 30 denotes a reduction mechanism which is included in the dehydrating shaft 27 and reduces the number of rotations by a group of gears. In order to prevent abnormal rotation due to imbalance of the dehydration tub 24 during dehydration, preferably a plurality of gears are symmetrical. A reduction mechanism with planetary gears arranged in the form of is used. The washing shaft 29 is connected to the output side of the speed reduction mechanism 30, and the washing side input shaft 34 is connected to the input side. The washing-side input shaft 34 is supported by an input bearing 35 provided in a lower hollow portion of the dehydrating shaft 27. The dehydrating shaft 27 including the speed reduction mechanism 30 is enclosed by a case 36, and a lower portion of the dehydrating shaft 27 is supported by a bearing 39 provided at a lower portion of the case 36. The case 36 is fixed to the bottom of the receiving cylinder 23. Reference numeral 31 denotes a drive motor for rotating the dehydrating shaft 27 and the washing-side input shaft 34. The rotor 31a of the drive motor 31 is connected to a lower portion of the washing-side input shaft 34. A stator 31b is disposed in the drive motor 31 so as to face a magnet provided on the outer periphery of the rotor 31a, and a gap S is provided between the stator 31b and the rotor 31a. The gap S is set not only in consideration of the variation of components, but also in order to prevent the magnet from coming into contact with the stator 31b on the outer peripheral surface of the rotor 31a rotated by the rotating magnetic field of the stator 31b. That is, the design is made in consideration of the amount of eccentricity of the rotor 31a due to the force received by the washing shaft 29 and the spinning shaft 27 during rotation. A part of the clutch mechanism for transmitting or not transmitting the rotation of the drive motor 31 to the dehydrating shaft 27 is connected to the rotor 31a of the drive motor 31. That is, the clutch mechanism is a rotor 31a of the drive motor 31.
, And a drive unit that contacts or separates the torque transmitting unit. The rotational force transmitting portion includes a fixed clutch portion 32a formed on a part of a rotor 31a connected to a lower portion of the washing-side input shaft 34 of the speed reduction mechanism 30, and a driving portion 32 composed of a solenoid or the like.
The movable clutch portion 32b comes into contact with and separates from the fixed clutch portion 32a due to c, and rotates together with the dehydrating shaft 27. As shown in FIG. 2, the fixed clutch portion 32a
Is a portion excluding the magnet of the rotor 31a, has a cylindrical shape with a bottom, and has a rectangular through hole for connecting the lower end side of the washing-side input shaft 34 at the bottom. On the upper surface of the bottom, a convex portion 33a extending radially from the through hole is formed. The movable clutch portion 32b is
a with a bottomed cylindrical shape that can be inserted inward from the upper opening of a
A concave portion 33b is formed on the lower bottom surface so as to engage with the convex portion 33a of the fixed clutch portion 32a. A flange 33c is provided on the side of the movable clutch portion 32b, and the lower surface of the flange 33c is
2c makes contact with the lever 32d which moves up and down. Therefore, when the lever 32d is moved up and down by the solenoid 32c, the movable clutch part 32b is moved up and down in accordance with the movement of the lever 32d, and comes into contact with or separates from the fixed clutch part 32a. The movable clutch portion 32b has a through hole in the center and is inserted below the dehydrating shaft 27. Dehydration shaft 2
7 is provided with a plurality of vertical grooves extending vertically, and a dehydrating shaft 27 is provided on the inner peripheral surface side of the through hole of the movable clutch portion 32b.
Are provided with a plurality of protrusions that fit into the vertical groove of the dehydrating shaft 27. The movable clutch portion 32b is vertically movable along the vertical groove of the dehydrating shaft 27, while the convex portion of the movable clutch portion 32b is Of the movable clutch portion 32b when in contact with the fixed clutch portion 32a.
Can be transmitted to the dehydrating shaft 27. In this embodiment, the rotor 31a of the drive motor 31 is formed as an inner rotor formed inside the stator 31b, but the rotor 31a is formed outside the stator 31b.
a, the shape of the outer rotor or the stator 3
1b and the rotor 31a may be vertically opposed. Next, the operation of this embodiment will be described.
First, in the washing / rinsing process, the solenoid 32c is used.
To the movable clutch portion 32 by the generated magnetic force.
b is moved to the side of the case 36 including the speed reduction mechanism 30, that is, upward, to disengage the projection 33a of the fixed clutch portion 32a from the depression 33b of the movable clutch portion 32b (FIG. 3).
a). Due to the disengagement, the rotation of the rotor 31 a of the drive motor 31 is not transmitted to the spinning shaft 27, but is transmitted to the stirring blade 25 via the washing-side input shaft 34, the speed reduction mechanism 30, and the washing shaft 29. This gives the laundry a mechanical force and performs the stirring operation. Thus, the washing and rinsing of the laundry housed in the dewatering tub 24 proceeds. When the washing and rinsing steps are completed, a dehydration step is started. In the dehydration process, the water in the dehydration tank 24 is drained, and at the same time, the power supply to the solenoid 32c is stopped. At this time, as shown in FIG. 3B, the movable clutch portion 32b descends along the vertical groove of the dehydrating shaft 27 by its own weight, and the convex portion 33a of the fixed clutch portion 32a and the concave portion 33b of the movable clutch portion 32b engage. Accordingly, the engagement of the convex portion 33a of the fixed clutch portion 32a and the concave portion 33b of the movable clutch portion 32b connects the dewatering shaft 27 and the rotor 31a, and the rotation of the rotor 31a of the drive motor 31 is transmitted to the dewatering shaft 27, and the stirring is performed. The whole wing 25 and the dewatering tub 24 rotate integrally. The moisture of the laundry that has been washed and rinsed by the centrifugal force generated by the rotation of the spin tub 24 is squeezed out into the receiving cylinder 23 through a number of holes provided on the side surface of the spin tub 24.
Thus, the laundry is automatically dehydrated. The laundry put in the dewatering tub 24 in this way completes the washing, rinsing and dewatering steps. In the washing / rinsing step, for example, the rotation of the rotor 31a of the drive motor 31 and the rotation of the washing-side input shaft 34 are reduced to 1/6 by the speed reduction mechanism 30 so that the washing shaft 29,
When the torque is transmitted to the stirring blade 25, the torque becomes about six times before deceleration if the transmission efficiency is ignored. In this way, the washing shaft 29 and the washing-side input shaft 34 are connected via the speed reduction mechanism 30. Even if the torque of the drive motor 31 is small, the torque for rotating the stirring blade 25 can be increased, The washing capacity can be increased and the washing performance can be improved without increasing the torque of the drive motor 31. The washing shaft 29 receives an eccentric force due to the collision of the laundry with the agitating blades 25. However, since the washing shaft 29 and the washing-side input shaft 34 are connected via the speed reduction mechanism 30, The force is absorbed by the gap between the gears of the speed reduction mechanism 30 and the like, and the eccentric force can be suppressed from acting on the washing-side input shaft 34. The rotor 31a of the drive motor 31 connected to the lower portion of the washing-side input shaft 34 Eccentricity can also be prevented. Therefore, it is not necessary to increase the gap S between the rotor 31a and the stator 31b more than necessary.
1 can be prevented from being enlarged. Further, when the gap S between the rotor 31a and the stator 31b is reduced, the torque for rotating the rotor 31a can be effectively increased. Further, in assembling the drive motor 31, first, the rotor 31a
After fixing the stator 31b, an annular stator 31b is inserted so as to be located on the outer peripheral side of the rotor 31a.
b is fixed to the lower part of the case 36. Therefore, the gap S between the rotor 31a and the stator 31b does not become uniform over the entire circumference due to the mounting position of the stator 31b or component variation, and places where the gap is large and where the gap is small are generated. As described above, even if the gap S varies due to the assembly, the contact between the rotor 31a and the stator 31b during rotation can be prevented by suppressing the amount of eccentricity of the rotor 31a. Similarly, the laundry collides with the agitating blades 25 to receive the eccentric force of the washing shaft 29. Since the washing shaft 29 is supported by the washing bearing 28, the force is first applied by the washing bearing 28. Received, and then relaxed by the speed reduction mechanism 30, and the rotor 31 of the drive motor 31
The eccentricity of a can be further suppressed. The clothes also collide with the dewatering tub 24, and the dewatering shaft 27 receives an eccentric force. However, in the washing / rinsing process, the rotation of the drive motor 31 is not transmitted to the dewatering shaft 27 by the clutch mechanism. Conversely, the eccentricity of the spinning shaft 27 is not transmitted to the drive motor 31, and the eccentricity of the rotor 31 a of the drive motor 31 can be further suppressed. Further, since the lower portion of the washing-side input shaft 34 and the clutch mechanism are directly connected to the rotor 31a of the drive motor 31, a bearing for supporting the rotating shaft of the rotor 31a is not required. There is no need to align the center of the input bearing 35 of the washing-side input shaft 34, the lower end of which is connected to the bearing 39 of the dehydrating shaft 27. In the dewatering process, the dewatering shaft 27 may receive an eccentric force. However, the dewatering shaft 27 is supported by the dewatering bearings 26 and 39, and the power is controlled by the dewatering bearing 2.
6. Since it is received by the bearing 39, the eccentricity of the rotor 31a of the drive motor 31 can be further suppressed. Further, since the rotational force transmitting portion including the fixed clutch portion 32a and the movable clutch portion 32b is provided between the rotor 31a of the drive motor 31 and the lower portion of the dehydrating shaft 27, the rotation of the rotor 31a of the drive motor 31 is performed. Can be easily realized and transmitted to the dehydrating shaft 27 in the vicinity. Embodiment 2 Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the figure, 36 includes a dehydrating shaft 27,
This is a cylindrical case in which a bearing 39 that supports the lower part of the dehydrating shaft 27 is provided inside the lower part. The outer periphery of the lower portion of the case 36 is recessed toward the center of the shaft to form a recessed portion 37, and the recessed portion 37 is provided with a mounting portion for the drive motor 31. [0037] With this configuration, it can be mounted as close to the drive motor 31 to the casing 36, the drive motor 31
The length of the washing-side input shaft 34 connecting the rotor 31a and the reduction mechanism 30 can be shortened, and the amount of eccentricity of the rotor 31a can be reduced. Further, since the movable clutch portion 32b is cylindrical with a bottom, when the movable clutch portion 32b moves upward,
The concave portion 37 covers the lower part of the case 36,
The concave portion 37 can also serve as a relief portion of the movable clutch portion 32b, and even in a device having a clutch mechanism, the length of the washing-side input shaft 34 can be shortened, and the amount of eccentricity of the rotor 31a can be reduced. Can be reduced. Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIG. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the drawing, reference numeral 38 denotes a washing-side input shaft formed integrally with the rotor 31a of the drive motor 31, which is the same as the washing-side input shaft 34 described in the first embodiment except that it is formed integrally. It is made to work. With the above structure, the rotor 31a of the drive motor 31 and the washing-side input shaft 38 are integrally formed, so that the connection strength between the rotor 31a and the washing-side input shaft 38 can be obtained even when the rotor 31a is thin. Therefore, the weight of the rotor 31a can be reduced, and the rising characteristics of the rotation can be improved. Further, since the rotor 31a is made thinner, the length of the washing-side input shaft 38 can be shortened.
Also reduces the amount of eccentricity. According to the present invention, since the washing shaft and the washing-side input shaft are connected via the speed reduction mechanism, the rotation torque for sufficient agitation without increasing the torque of the drive motor itself. , The washing capacity can be increased, and the washing performance can be improved. Even if the washing collides with the stirring blades and the washing shaft receives eccentric force, the force is applied to each gear of the reduction mechanism. is absorbed by such a gap between, to suppress the eccentricity of the rotor, it is possible to reduce the gap between the rotor and the stator, the miniaturization of the driving motor, the improvement of assemblability, further improve the performance of the drive motor it can be. Ma
Also, the drive motor can be mounted close to the case.
Therefore, the amount of eccentricity of the rotor can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the entire configuration of a washing machine according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view showing the configuration of a drive unit of the washing machine. 3 is a cross-sectional view of a main part of a driving unit of the washing machine. FIG. 4 is a cross-sectional view showing an entire configuration of a washing machine according to a second embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating the entire configuration of a certain washing machine. FIG. 6 is a cross-sectional view illustrating the entire configuration of a conventional washing machine. [Description of References] 23 receiving cylinder 24 dehydrating tub 25 stirring blade 26 dehydrating bearing 27 dehydrating shaft 28 washing bearing 29 washing Shaft 30 Reduction mechanism 31 Drive motor 31a Rotor 31b Stator 32 Clutch mechanism 32a Fixed clutch part 32b Movable clutch part 34 Washing-side input shaft 35 Input bearing 36 Case 37 Depressed part 39 Bearing

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shinichi Matsuda 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-9-10474 (JP, A) JP-A-4- 257696 (JP, A) JP-A-7-116379 (JP, A) JP-A-2-237596 (JP, A) JP-A-56-35391 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06F 1/00-51/02

Claims (1)

(57) [Claims 1] A dewatering shaft for rotating a washing and dewatering tub, and a stirring blade disposed in the washing and dewatering tub are rotated and arranged coaxially with the dewatering shaft. A washing shaft provided; a drive motor for rotating the spinning shaft and the washing shaft; a clutch mechanism for switching rotation of the drive motor to be transmitted to the spinning shaft; and a washing shaft for reducing the rotation of the drive motor. a speed reduction mechanism by a planetary gear that rotates and containing the deceleration mechanism
Bearing enclosing a dewatered shaft and fixing the dewatered shaft
A clutch provided on the inner side of a lower portion, wherein the clutch mechanism includes a fixed clutch portion having a plurality of meshes formed on an outer peripheral side from an axis of a rotor of the drive motor;
Movable clutch for engaging the latch portion, and and a clutch driving unit, <br/> replaced so that off rotation transmission of the drive motor to the dewatering shaft by moving the movable clutch part in the vertical direction And a concave portion is formed by depressing the lower outer periphery of the case toward the central axis , and a front portion is formed in the concave portion.
Washing machine provided with a mounting portion of the serial motor.