JP2001017782A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent water from entering a motor to improve the safety of a washing machine by mounting a motor bracket on a speed reducing mechanism with its opening down, and arranging the motor constituted in the motor bracket and the speed reducing mechanism on the same axial line. SOLUTION: A spin shaft 22 is supported on the bottom of a water receiving tub by a bearing 21, a washing shaft 24 is supported within the hollow part of the spin shaft 22 by a bearing 23, and a speed reducing mechanism 25 is connected to the lower end of the washing shaft 24. A motor bracket 26 is molded in a cup shape, and mounted on the speed reducing mechanism 25 with its opening down. A stator 27b for imparting a rotating magnetic field to a rotor 27a is pressed into the motor bracket 26 to constitute a motor 27. The speed reducing mechanism 25 and the motor 27 are arranged on the same axial line, and the motor 27 is mounted on the speed reducing mechanism input shaft 28 of the speed reducing mechanism 25. Namely, the speed reducing mechanism input shaft 28 to the speed reducing mechanism 25 is connected to the rotating center in the rotor 27a of the motor 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine for washing, rinsing and dewatering clothes.

[0002]

2. Description of the Related Art Conventionally, this type of washing machine has been configured as shown in FIG. Hereinafter, the configuration will be described.

As shown in FIG. 1, a washing machine main body 1 is provided with a water receiving tub 3 supported by a suspension 2 therein.
A washing and dewatering tub 4 is rotatably provided in the water receiving tub 3, and the washing and dewatering tub 4 has an open top surface so that laundry can be put in from the top surface. Further, a stirring blade 5 is rotatably provided at the bottom, and has a large number of holes on the side surface.

As shown in FIG. 5, the washing and dewatering tub 4 is fixed to a dewatering shaft 7 supported by a bearing 6 provided on the bottom surface of the water receiving tub 3. Is fixed to a washing shaft 9 supported by a bearing 8 inside the inside. The washing shaft 9 is connected to a speed reduction mechanism 10, and a pulley 12 is attached to the speed reduction mechanism input shaft 11.

[0005] The mounting portion of the pulley 12 of the speed reduction mechanism input shaft 11 has four cut-out surfaces, and the mounting hole of the pulley 12 is formed in a shape that fits into the hole, thereby transmitting the rotational force of the pulley 12. The pulley 12 is connected to a motor 14 via a belt 13. Further, the speed reduction mechanism input shaft 11 has a clutch mechanism 15 for switching the rotation of the motor 14 to the washing shaft 9 or the dehydrating shaft 7 and transmitting the rotation.

In the above configuration, during the washing and rinsing steps,
Release the clutch driving means 15b of the clutch mechanism 15,
The rotation of the motor 14 is only transmitted to the stirring blade 5 via the washing shaft 9 and gives a mechanical force to the laundry. Thus, the washing and rinsing of the laundry stored in the washing and dewatering tub 4 proceeds.

In the dehydration process, the clutch driving means 15b of the clutch mechanism 15 is driven, and the rotation of the motor 14 is transmitted only to the washing and dewatering tub 4 via the dehydrating shaft 7, so that the entire washing and dewatering tub 4 is rotated. Rotates. The water content of the laundry, which has been washed and rinsed by the rotation of the washing and dewatering tub 4, is squeezed out into the water receiving tub 3 from a large number of holes provided on the side surface of the washing and dewatering tub 4 by centrifugal force. It is.
Thus, the laundry is automatically dehydrated.

[0008]

In such a conventional configuration, the speed reduction mechanism 1 is driven by the motor 14 via the belt 13.
Since the power is transmitted to 0, the number of parts increases to increase the washing capacity and the cleaning power, and the cost is high. There was an upper limit on the transmission torque due to a change in the tension of the belt 13 due to a change over time such as belt elongation or belt breakage, and it was not possible to obtain a transmission torque corresponding to a large capacity.

Since the heavy motor 14 and the speed reduction mechanism 10 are arranged below the water receiving tub 3, the washing and dewatering tub 4 suspended in the main body 1 of the washing machine and the water receiving tub are provided. 3
And the center of gravity of the washing / dewatering tub 4 is deviated from the rotation center (dehydrating shaft 7) of the washing and dewatering tub 4. Thus, when the washing and spin-drying tub 4 performs spin-drying, it tends to be unbalanced, and vibration due to spinning tends to increase.

The present invention has been made to solve the above-mentioned conventional problems, and reduces the number of parts and suppresses the occurrence of unbalance during dehydration in response to an increase in washing capacity.
Even if water overflows from the water receiving tank for some reason, it is an object of the present invention to prevent water from entering the inside of the motor and improve safety.

[0011]

SUMMARY OF THE INVENTION The present invention achieves the above-mentioned object, and comprises rotating a hollow dewatering shaft and a washing shaft arranged coaxially with the dewatering shaft by a motor so that the dewatering shaft can be used for washing and washing. While rotating the spin-drying tub, the rotation of the motor is reduced by the speed reduction mechanism, the washing shaft is rotated by the washing shaft, and the stirring blade disposed in the spin-drying tub is rotated. Then, a motor bracket formed in a cup shape is attached to the speed reduction mechanism with the opening downward, a motor is formed in the motor bracket, and the speed reduction mechanism and the motor are arranged on the same axis.

Thus, it is possible to reduce the number of parts, suppress the occurrence of imbalance during dehydration in response to an increase in washing capacity, and to prevent water from overflowing from the water receiving tank for some reason. In addition, water can be prevented from entering the inside of the motor, and safety can be improved.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention is characterized in that a dehydrating shaft for rotating a washing and dewatering tub, a stirring blade disposed in the washing and dewatering tub are rotated and the dehydrating shaft is rotated. A washing shaft arranged coaxially, a motor for rotating the dehydrating shaft and the washing shaft, a reduction mechanism for reducing the rotation of the motor to rotate the washing shaft, and transmitting the rotation of the motor to the dehydrating shaft A clutch mechanism that switches the motor mechanism so that the motor mechanism is provided with a bearing at the lower part of the speed reduction mechanism and a cup-shaped motor bracket is attached with the opening downward, and a clutch mechanism is formed inside the motor bracket. A motor in which a stator is press-fitted and held inside the motor bracket, a rotor is opposed to an inner peripheral side of the stator, and the speed reduction mechanism and the motor are arranged on the same axis. A.

In this configuration, the motor is formed in a motor bracket formed in a cup shape, and the opening of the motor bracket is directed downward, so that there is no seam at the upper portion of the motor bracket and the water overflowing from the water receiving tank. Can be prevented from entering the motor. In addition, since the speed reduction mechanism and the motor are located on the same axis, the position of the center of gravity of the washing and dewatering tub and the water receiving tub can be matched with the rotation center of the washing and dewatering tub, thereby causing imbalance during dehydration. In addition to reducing the number of parts, the number of parts can be reduced and the assemblability can be improved, and the clutch mechanism can be made thinner and smaller. A large volume below the washing machine body can be suppressed.

[0015]

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

(Embodiment 1) As shown in FIG. 2, a washing machine main body 16 is provided with a water receiving tank 18 suspended by a suspension 17 so as to prevent dehydration vibration therein. The washing and dewatering tub 19 is rotatably arranged in
A stirring blade 20 for stirring the laundry is rotatably disposed on the inner bottom of the washing and dewatering tub 19.

The washing and dewatering tub 19 is, as shown in FIG.
The stirring blade 20 is fixed to the upper end of a dehydrating shaft 22 which is supported by a bearing 21 provided at the bottom of the water receiving tank 18.
It is disposed coaxially with the dewatering shaft 22 in the hollow portion of the dewatering shaft 22, and is fixed to the upper end of a washing shaft 24 supported by a bearing 23 provided in the hollow portion of the dewatering shaft 22. The lower end of the washing shaft 24 is connected to the output side of the speed reduction mechanism 25.

The motor bracket 26 is formed in a cup shape and is mounted on the speed reduction mechanism 25 with the opening downward, and a stator 27b for applying a rotating magnetic field to the rotor 27a is press-fitted into the motor bracket 26. The motor 27 is constituted by opposing the motor 27a and the speed reduction mechanism 2
5 and the motor 27 are arranged on the same axis,
The motor 27 is mounted on the input shaft 28 of the speed reduction mechanism.
The direction of the burrs of the laminated steel plates of the stator 27b is opposite to the direction of press fitting.

Also, a beat 26a is provided on the upper surface of the motor bracket 26, an opening 26b is provided on a side surface above the mounting surface of the stator 27b, and the opening 26b is formed in a downward louver shape. 27b
And the number of poles.

The reduction mechanism input shaft 28 of the reduction mechanism 25 is connected to the rotation center of the rotor 27a of the motor 27.

The clutch mechanism 29 switches the rotation of the motor 27 to either the dehydrating shaft 22 or the washing shaft 24. A clutch spring 29a is provided in a space provided inside the rotor 27a, and the clutch spring 29a is driven externally. A clutch driving means 29b is provided.

The operation of the above configuration will be described. Washing,
In the rinsing stroke, the clutch driving means 29b of the clutch mechanism 29 releases the clutch spring 29a, and the dehydrating shaft 2
2 cannot transmit torque. The power of the motor 27 is only transmitted to the stirring blade 20 via the washing shaft 24, and gives a mechanical force to the laundry. Thus, the washing and rinsing of the laundry housed in the washing and dewatering tub 19 proceeds.

When the washing step is completed, a dehydration step is started. In this dehydration step, water in the washing and dewatering tub 19 is drained,
The clutch driving means 29b of the clutch mechanism 29 drives the clutch spring 29a so that a rotational force can be transmitted to the dehydrating shaft 22. As for the power of the motor 27, the speed reduction mechanism input shaft 28 and the dehydrating shaft 22 are connected, and the washing and dehydrating tub 19 rotates.

The rotation of the washing and dewatering tub 19 causes the water content of the laundry, which has been washed and rinsed, to be condensed by the centrifugal force into the water receiving tub 18 from a number of holes provided on the side surface of the washing and dewatering tub 19. Will be issued. Thus, the laundry is automatically dehydrated. In this manner, the laundry put into the washing / dewatering tub 19 automatically finishes the washing, rinsing, and dehydrating steps.

As described above, according to the present embodiment, the washing shaft 2
4. The dehydrating shaft 22 has a double structure in which the dehydrating shaft 22 is coaxial, and the speed reducing mechanism 25, the clutch mechanism 29, and the motor 27 are arranged in this order from the stirring blade 20 side, and since these are on the same axis, the motor 27 and the speed reducing mechanism 25 are arranged. Are integrated, and the center of gravity is located at the center of the water receiving tank 18, so that the imbalance caused by the motor 27 not being at the center of the water receiving tank 18 as in the related art is eliminated, and vibration during dehydration can be suppressed. Further, since the speed reduction mechanism 25 and the dehydrating shaft 22 are directly rotated by the motor 27, a conventional belt is not required, and belt slip and durability can be eliminated.

A motor 27 is formed in a motor bracket 26 formed in a cup shape.
6, the opening of the motor bracket 26
In the case where there is no seam on the upper surface and the water overflows from the water receiving tank 18, the overflowing water can be prevented from entering the inside of the motor 27 and the motor bracket 26 becomes an integral part, so that the number of parts can be reduced. In addition, the assemblability can be improved, and the weight can be reduced.

Further, since only the center of the upper surface of the motor bracket 26 is fixed to the speed reduction mechanism 25 with the opening of the motor bracket 26 facing downward, the motor 27 rotates between the stator 27b and the rotor 27a when the motor 27 rotates. Vibration occurs due to absorption and repulsion of electromagnetic force. By providing the beat 26a on the upper surface of the motor bracket 26, the strength of the upper surface of the motor bracket 26 can be increased without increasing the thickness of the motor bracket 26, and the stator 2
Even if the vibration caused by the attraction and repulsion of the electromagnetic force generated between the rotor 7b and the rotor 27a is transmitted to the upper surface of the motor bracket 26, the vibration can be prevented from resonating.

Further, the upper surface of the motor bracket 26 does not receive the deformation force only by being squeezed into a cup shape, so that the distortion received when the material is left is left, and the flatness is not good. , Motor bracket 26
And the cylindricity of the side surface portion 26c of the motor bracket 26 can be improved.

The stator 2 of the motor bracket 26
There is no notch in the press-fit portion of 7b, so that the stator 27b can be sufficiently held, and the laminated section of the stator 27b is covered with the motor bracket 26, so that water can be prevented from entering.

Further, since the opening 26b is provided on the side surface above the mounting surface of the stator 27b, the heat generated by the coil 27c of the stator 27b can be discharged without accumulating inside the motor bracket 26. Also, since the opening 26b has a downward louver shape, the motor bracket 2
6 can be prevented from entering.

Further, since the number of openings 26b provided in the motor bracket 26 is made equal to the number of poles of the stator 27b, the heat generated by the coils 27c of the respective poles of the stator 27b is transferred to the motor bracket 26c for each coil 27c. The heat can be discharged to the outside of the motor bracket 26 through the opening 26b provided in the motor bracket 26, and the cooling effect of the motor 27 can be enhanced.

Also, since the direction of the burrs of the laminated steel plates of the stator 27b is opposite to the direction of press-fitting, the stator 27b
When the stator 27b receives the forced vibration during dehydration, the burrs of the laminated steel plate bite into the motor bracket 26, and the stator 27b falls off. Can be prevented. Further, the laminated steel plate of the stator 27b can be easily pressed into the motor bracket 26.

(Embodiment 2) As shown in FIG. 3, the motor cover 30 is formed in a cup shape and covers the motor 27. The inner diameter of the motor cover 30 is
6 so that the motor bracket 26 is covered by the motor cover 30.

The side surface of the motor cover 30 overlapping the motor bracket 26 is longer than the notch 26d of the motor bracket 26. Further, the motor cover 30
The contact surface 26e for determining the amount of fitting so as to cover the motor bracket 26 is
f. Other configurations are the same as those in the first embodiment.

The operation of the above construction will be described. The inner diameter of the motor cover 30 is made larger than the outer diameter of the motor bracket 26, and the motor cover 30
6, the motor 27 has a coil crossover 27d
It is not necessary to increase the outer diameter of the stator 27b by the thickness of the motor cover 26 to secure the insulation distance from the motor bracket 26 to the side surface portion 26c of the motor bracket 26, and the outer diameter of the motor bracket 26 can be reduced.

Further, the hole in the side surface portion 26c and the cutout portion 27d of the motor bracket 26 can be concealed by the motor cover 30, so that intrusion of water from the outside can be prevented. Further, since the end face portion 26f of the motor bracket 26 does not need to be finished around the entire circumference, the number of processing steps can be reduced, and the cost can be reduced.

Since the side surface of the motor cover 30 overlapping the motor bracket 26 is longer than the notch 26d of the motor bracket 26, the notch for securing the neutral point insulation distance provided on the motor cover 30 and the notch for caulking are provided. The notch 26d of the motor bracket 26 serving as a raised portion can be completely hidden. Also, the motor bracket 26
Can be corrected, and the deformation of the end face portion 26f of the motor bracket 26 due to the drawing can be hidden.

Further, the contact surface 26 which determines the amount of fitting so that the motor cover 30 is covered by the motor bracket 26.
Since e is formed on the end face 26f of the motor bracket 26, the end face 26f of the motor bracket 26 does not need to be finished all around, so that the number of processing steps can be reduced,
There is no need to use a large press machine, and the cost can be reduced.

[0039]

As described above, according to the first aspect of the present invention, the size of the motor mechanism disposed below the washing machine can be reduced without lowering the torque.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a washing machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the washing machine.

FIG. 3 is a sectional view of a main part of a washing machine according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a conventional washing machine.

FIG. 5 is an enlarged sectional view of a main part of the washing machine.

[Description of Signs] 19 Washing / dewatering tub 20 Stirrer blade 22 Dehydrating shaft 24 Washing shaft 25 Reduction mechanism 26 Motor bracket 27 Motor 29 Clutch mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihiko Ura 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Junichi Takamatsu 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A dehydrating shaft for rotating a washing and dewatering tub, a washing shaft for rotating a stirring blade disposed in the washing and dewatering tub and disposed coaxially with the dewatering shaft, and A motor for rotating the washing shaft, a deceleration mechanism for reducing the rotation of the motor to rotate the washing shaft, and a clutch mechanism for switching the rotation of the motor to be transmitted to the dehydrating shaft; A motor bracket formed in a cup shape is provided with an opening on the lower side, and a clutch mechanism is formed inside the motor bracket, and the motor presses and holds a stator inside the motor bracket. A washing machine in which a rotor is opposed to an inner peripheral side of the stator, and the speed reduction mechanism and the motor are arranged on the same axis.