JPH0256919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device that drives a load, such as a kettle that opens and closes the middle of a drainage path of a washing machine, a clutch that switches between washing operation and spin-drying operation, and a brake that stops spin-drying operation. Specifically, in a structure that drives the load by decelerating and transmitting the rotational force of a small motor, when it is no longer necessary to drive the load, the output shaft and It reverses the reduction gear group and returns it to its original state reliably and quickly.

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

Fig. 1 shows the structure of a dehydrating/washing machine incorporating a drive device using a small motor. 1 is an outer frame, inside which a water tank 3 is suspended and supported in a vibration-proof manner through a vibration isolator 2. . Inside the water tank 3, there is rotatably supported a dewatering/washing tub 5 in which a pulsator 4 for agitating clothes is rotatably disposed at the center of the bottom.

On the outer bottom surface of the water tank 3, a base plate 8 is disposed to which a main motor 6, a mechanical part 7 incorporating a brake, etc. are fixed. Further, a drain port 9 is formed at the bottom of the tank 3, and this drain port 9 communicates with a pot 10 that opens and closes a drainage path for water in the tank 3. A clutch 11 is disposed at the lower end of the mechanism section 7 to switch between a dewatering operation and a washing operation.

2 to 4 show the details of the above-mentioned drive device. Reference numeral 12 indicates this drive device, and its drive output opens and closes the aforementioned lock 10 via the operating stick 13, and also moves the clutch 11 into the clutch position. The switching operation is performed via 14. It also opens and closes the brake within the mechanism section 7.

The drive device 12 is roughly divided into a small motor 15a, a clutch section 15, a reduction gear group 16, an auxiliary switch section 17, and an output shaft 18. The output shaft 18 operates the aforementioned operating rod 13 via a joint 19.

Next, the structure and operation of the small motor 15a and the clutch portion 15 will be explained. Reference numeral 20 denotes a coil portion made of copper wire or the like, which is wound on a bobbin 21. Reference numeral 22 denotes an iron core, and a motor shaft 24 is disposed inside the iron core, which is rotatably supported by a bearing 23 and slidably in the axial direction.

A rotor 2 holds a cylindrical hysteresis ring 25 at one end of the motor shaft 24.
Further, like the rotor 26, a suction plate 27 made of a magnetic material, for example, a thin steel plate, is fixed to the one end of the motor shaft. A motor pinion 28 is fixed to the other end of the motor shaft 24, and is disposed so as to be freely retractable so as to mesh with a specific gear in the middle of the reduction gear group 16 mentioned above. 29 is small motor 1
5a, the peripheral edge is bent toward the rotor 26 side to form a magnetic pole 30, and a shading 31 is wrapped around the magnetic pole. On the rotor 26 side of the bobbin 21, a main pole 33 and a complementary pole 34 having a substantially donut-shaped shading 32 therein are fixed via an iron core 22. Iron core 22, rotor 26 and suction plate 2
7 and is biased by a spring 35 so as to be separated from it.

The motor pinion 28 is arranged to mesh with the first gear 36 of the reduction gear group 16. The rotational force of the small motor 15a is suitably decelerated by a gear train from the first gear 36, and is transmitted to the main power shaft 18 at low speed rotation and high torque. Therefore, the small motor 15a
Even if the output is small, it can operate high-load mechanisms such as brakes and kettles.

The motor pinion 28 meshes with the first gear 36 when the coil section 20 is energized to generate a magnetic field and the attraction plate 27 is attracted toward the main/commuting poles 33 and 34 side. FIG. 3 shows that the motor pinion 28 is
It is in a state in which it is engaged with the first gear 36, and FIG. 4 shows a state in which it is not engaged in a non-energized state. That is, the clutch portion 15 constitutes a so-called electromagnetic clutch in which gears are engaged and disengaged by the axial thrust motion of the rotor 26 and the suction plate 27.

Reference numeral 37 denotes a case of the driving device, into which the frame 29 and bearing plate 38 described above are fixed by fitting or the like. Frame 29 and bearing plate 38
Each gear of the reduction gear group 16 is connected to a small motor 15a.
I support this along with others. Further, the bearing plate 38 integrally forms a holding part 39 for holding the contact piece of the auxiliary switch part 17.

As shown in FIG.
It can be attached by fixing the case 40 to the drain port 9 provided at the bottom of the case. A valve body 41 is brought into contact with a portion of the interior of the case 40 by the biasing force of a spring 42, thereby achieving a closed state. Reference numeral 43 denotes a stopper, and 44 a fitting, which locks the valve body 41 to the operating rod 13. 45 is the operation stick 13
A locking member provided in the middle corresponds to the clutch piece 14.

FIG. 6 shows the operation of the output shaft 18 and the operating rod 13. A joint 19 fixed to the end of the output shaft 18 has an arm 19a, and a shoulder bolt 46 with a collar is attached to the arm 19a. is fixed,
This stepped bolt 46 allows the joint 19 to
On the other hand, an operation stick 13 is rotatably attached.

FIG. 6A shows the small motor 15a of the drive device 12.
The connection point B between the operation stick 13 and the joint 19 is connected to the valve body 4 of the cock 10.
1 is the position when the valve seat part is securely pressed, and the joint 19 is at the connecting point A when moved by dimension b (several mm) to the opposite side of the rotation direction shown by arrow X. Abutting stopper part 47
has been established.

When the small motor 15a is energized, the joint 19 and the operation stick 13 begin to rotate in the direction of the arrow X.
The notch 48 formed in the operating rod 13 moves by the distance a from point B to a point C where it comes into contact with the output shaft 18 as shown in FIG. 6B, and the rotation of the joint 19 stops. The rotation angle of the joint 19 at this time is set to 180 degrees or less.

In this state, the small motor 15a continues to be energized, but this small motor 15a uses a hysteresis motor and has a large coil impedance. Since the difference between the two is reduced, there is no need to worry about the motor burning out, and it is designed so that it can be used while maintaining the restraint state.

In the state shown in FIG. 6B, the valve body 41 of the washing machine 10 is in an open state, and at the same time, the clutch piece 14 is also engaged with the locking member 45, so that the clutch of the washing machine is in a dewatering state.

When the small motor 15a of the drive device 12 is de-energized, the suction plate 27 is separated by the urging force of the spring 35, and the motor pinion 28 is separated from the first gear 36.

Due to the biasing force of the spring 42 of the cock 10 and the spring of the load such as the spring of the brake, etc., a load is applied to the operating stick 13 to try to return it to its original position, but as described above, the motor pinion 28 Since it is separated from the first gear 36, the reduction gears from the second stage onward are reversely rotated. Reducing the resistance during reverse rotation means increasing the speed during return (release), instantaneous operation of the brake, precise operation of the clutch, or the reduction of the valve body 41 in the lock 10.
You will receive a strong and shocking pressure.

In addition, 49 is a pin that fixes the joint 19 and output shaft 18 in a non-rotating state, and 50 is the case 3.
A cover is provided to cover the opening of 7, from which the end of the output shaft 18 extends. 51 and 52 are bearings provided in the cover 50 and the frame 29;
The output shaft 18 is pivotally supported.

As is clear from the above embodiments, the present invention includes a small motor, a motor pinion fixed to the motor shaft of the small motor, and a gear that can engage and disengage the motor pinion, and controls the rotation of the small motor. A reduction gear group for transmitting deceleration, and an output shaft disposed on the output side of the reduction gear group and driving a load by rotation thereof, and the output shaft and the reduction gear group are connected to each other when the motor pinion and the gear are separated from each other. , the load can be reversed by the biasing force of the spring on the load side, allowing the load to quickly and reliably return to its original state, and since the biasing force of the load's spring is used, the output shaft and There is no need for a complicated structure in which a biasing force of a spring is separately applied to the gear group, and the number of assembly steps can be simplified and operational reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a washing machine for dehydration and dehydration equipped with a drive device according to an embodiment of the present invention, FIG. 2 is a plan view schematically showing the rotation reduction structure of the drive device, and FIG. FIG. 4 is a longitudinal sectional view showing the operating state, FIG. 4 is a longitudinal sectional view showing the non-operating state, FIG. Figure B is a side sectional view, Figure 6 shows the output shaft and operation stick of the drive device, Figure A is a plan view when the drainage pot is closed, and Figure B is a plane view when the drainage pot is opened. FIG. 3C is a vertical cross-sectional view corresponding to FIG. 12... Drive device, 15a... Small motor, 1
6... Reduction gear group, 18... Output shaft, 28... Motor pinion, 36... First gear, 42... Spring (spring body).

Claims (1)

[Claims] 1. A small motor, a motor pinion fixed to the motor shaft of the small motor, a group of reduction gears with which the motor pinion has gears that can be engaged and disengaged and that reduces and transmits the rotation of the small motor, and the group of reduction gears. The output shaft is arranged on the output side and drives the load by its rotation, and the output shaft and the reduction gear group can be reversed by the biasing force of the spring on the load side when the motor pinion and the gear are separated. drive device for the loaded load.