JP2000042286A - Power transmitting apparatus for washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmitting apparatus for a washing machine in which erroneous action during switching of power is prevented from occurring by a clutch and a buoyancy box used for switching washing process and spin- drying process. SOLUTION: In a power transmitting apparatus constituted in such a way that during washing process, an agitator 7 and a washing/spin-drying basket 6 are rotated mutually in the opposite direction by reducing rotation of a motor shaft 61 by means of a speed reducing means and during dehydration process, the agitator 7 and the washing/spin-drying basket 6 are rotated in the same direction and at the same speed by means of the motor shaft 61, a spinning shaft 65 fitted in a specified height of the outer periphery of the motor shaft 61 and pressed in and fixed at the rotational center of the washing/spin-drying basket 6 and rotated integrally with the washing/spin-drying basket 6 and at least one oilless bearing 64a and 64b between the motor shaft 61 and the spinning shaft 65 are placed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a washing machine, and more particularly, to the same washing and washing machine as an existing washing machine without a clutch for switching power between a washing process and a dehydration process. Dehydration can be performed,
The present invention relates to a power transmission device for a washing machine that generates a new water flow (high-pressure water flow) during a washing process.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 1, a conventional washing machine includes an outer tub 2 and a
A water supply means 8 for supplying washing water to the inside of the dewatering tub 6 is mounted, and a drainage means 9 for discharging the washing water in the washing / dewatering tub 6 to the outside is mounted at one lower end thereof. ing.

At the lower end of the water supply means 8, there is provided a detergent dissolving means 10 for dissolving the supplied detergent by water supply and supplying it to the outer tub 2 and the washing / dewatering tub 6 together with the washing water. Have been.

On the bottom surface of the washing / dewatering tub 6, the flow of the washing water in the washing / dewatering tub 6 is made turbulent while being turned left and right by the transmission of power, and the laundry is physically urged. A stirrer 7 for performing stirring and washing is mounted.

At the center of the outer tub 2 is provided a motor shaft 11 to which the stirrer 7 is connected.
A dehydrating shaft 12 connected to a washing / dehydrating tub 6 that rotates at a high speed during the dehydrating process is inserted outside the outer tub 1, and the motor shaft 11 and the dehydrating shaft 12 are provided on the outer bottom surface of the outer tub 2 by an applied power supply. Power generating means 3 for generating power to rotate the motor.

That is, the power transmission means 3 is disclosed in Japanese Patent Application No. 98-26456 (filing date:
It was already filed with the Korean Patent Office as July 1, 1998). That is, as shown in FIGS. 2 to 4, the power transmission means 3 is configured such that the motor shaft 11 rotates at the center of rotation of the outer tub 2 by transmitting the power of the motor 31. A stator 31a that forms a magnetic field when a power is applied thereto, and a rotor 31b that rotates inside the stator 31a due to the influence of the magnetic field formed by the stator 31a, has an inner peripheral surface thereof. The motor shaft 11 is press-fitted and rotates.

A motor 31 is provided above and below the motor 31.
Upper and lower cover flanges 31c, 3
1d is fastened by a fastening member 32a, and the upper cover flange 31c is fastened to a lower end surface of the outer tub 2 by a fastening member 32a.
b.

The motor shaft 11 is provided inside the outer tub 2.
A sealing member 33 for preventing the water in the outer tub 2 from leaking between the outer tub 2 and the outer peripheral surface of the outer tub 2 and for rotating the motor shaft 11 separately from the outer tub 2; The inner ring is pressed into the outer peripheral surface of the motor shaft 11, and the outer ring is fitted to the upper and lower cover flanges 31c, 31c.
A ball bearing 34 press-fitted on the inner peripheral surface of 31d is provided.

The motor shaft 11 is provided with a washing / dewatering tub flange 6a interlocked with the washing / dewatering tub 6.
A nut 35 is fastened to the upper portion of the washing / dewatering tub flange 6a to prevent the washing / dewatering tub flange 6a from being detached while rotating from the motor shaft 11. A lower carrier 36 is fastened to the upper surface by a fastening member 32c.

A plurality of planet gears 37 are supported on the lower carrier 36 via a shaft 38.
7, a sun gear 3 meshed with the motor shaft 11 is provided.
An internal gear 40 meshes with the outside of the planetary gear 37, and an upper carrier 41 has a plurality of shafts 3 above a shaft 38 connecting the lower carrier 36.
8 supported.

On the outer peripheral surface of the internal gear 40, a drum 4
2 is press-fitted, and a metal bearing 43 is inserted into the upper inner peripheral surface of the drum 42 so as to rotate separately from the upper carrier 41. The stirrer 7 for stirring the washing water and the laundry in the washing / dewatering tub 6 is fixed with a nut 44 for fastening the upper part of the drum 42.

A lower clutch 45 is formed on the upper inner peripheral surface of the drum 42.
A buoyancy box 46 which moves up and down by buoyancy acting according to the presence or absence of the washing water is provided on the upper side of 5, and a connecting rod 47 connected to the lower side of the buoyancy box 46 is connected.

An upper clutch 48 engaged with the lower clutch 45 is provided at the lower end of the connecting rod 47, and the height of the buoyancy box 46 is made constant at the upper center of the agitator 7. Buoyancy box cover 49 is provided.

At the uppermost end of the motor shaft 11, a rectangular portion 50 having a polygonal or spline shape is formed, and is engaged with the upper clutch 48.

Further, a sleeve 51 is inserted between the outer peripheral surface of the motor shaft 11 and the washing / dewatering tub flange 6a so as to slide mutually.

First, when power is applied to the motor 31 during the washing process to rotate the motor shaft 11, the motor shaft 11 is formed on the outer peripheral surface at the upper end. The sun gear 39 is rotated, and the plurality of planetary gears 3 meshed with the sun gear 39 are rotated.
7 rotates in the opposite direction to the sun gear 39, so that the internal gear 36 meshed with the outer periphery of the planetary gear 37 rotates at the reduced rotation speed in the same direction as the planetary gear 37, The drum 42 linked with the outer peripheral surface of the internal gear 36 rotates, and the drum 42
The stirrer 7 fixed to the outer periphery of the motor shaft 11 rotates interlockingly with the motor shaft 11 in directions different from each other.

Further, upper and lower carriers 41, 3 for connecting the shaft 38 of the planetary gear 37 at the upper and lower parts.
6 rotates at a rotation speed reduced by the motor shaft 11 to rotate the washing / dewatering tub flange 6a fastened to the lower carrier 36 by the fastening member 32c,
The dewatering tank 6 is rotated.

That is, during the washing process, the washing / dewatering tub 6 and the stirrer 7 rotate in opposite directions to perform washing.

On the other hand, the washing and dewatering tub 6
When the washing water is drained into the buoyancy box 50, the buoyancy box 50 descends, and the upper clutch 48 formed at the lower end thereof moves to the upper carrier 41.
Is engaged with the lower clutch 45 formed at the bottom.

In this state, when the motor shaft 11 rotates at a high speed, the upper carrier 48 and the upper carrier 41, which has been clutched, rotate at a high speed, and the lower carrier 36 rotates by the shaft 38 connected to the upper carrier 41. As a result, the washing / dewatering tub flange 6a and the washing / dewatering tub 6 rotate at a high speed to dehydrate the laundry.

That is, during the dewatering process, the sun gear 3
9, the planetary gear 37 and the inscribed gear 40 rotate integrally with each other in a meshed state, and the drum 42 and the agitator 7 simultaneously rotate in the same direction.

[0022]

The power transmission device of the conventional washing machine constructed as described above switches the power to the washing process or the dehydrating process. And the lower clutch 45 are separated or connected in an uneven shape. However, in the power switching method of such a structure, since the buoyancy box 46 is used for a long time in water, the water scale generated at the operation portion of the buoyancy box 46 is used. As a result, the buoyancy box 46 does not move up and down smoothly due to foreign matters such as debris and the like, so that the washing process or the dewatering process is not smooth and a malfunction occurs.

Further, the power transmission device of the conventional washing machine uses the back electromotive force of the motor 31 for rapid braking when the agitator 7 and the washing / dewatering tub 6 are simultaneously rotated at a high speed in the same direction during the dewatering process. Although such a braking system is used, there is a problem that such a braking system does not have a mechanical braking means, so that sudden braking cannot be performed at the time of a power failure.

Further, during the conventional washing process, the washing / dewatering tub 6 supplies the power of the motor shaft 11 to the sun gear 39 and the planetary gear 3.
7, and the rotation is transmitted through a reduction device including the internal gear 40 and the like.
m), so that when the agitator 7 and the washing / dewatering tub 6 are rotated in opposite directions to each other, the flow of the water flow caused by the imbalance of the forward and reverse rotations with respect to each other. However, there is a problem that the washing power of the laundry is markedly reduced.

[0025]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned various problems, and an object of the present invention is to provide a motor shaft which is rotated with an inertia force proportional to an initial rotation speed. Washing is performed by rotating the motor shaft and the washing / dewatering tub in the same direction during the washing process and rotating in the opposite direction to the stirrer, or washing with the motor shaft during the spinning process.・ By performing dehydration by rotating the dehydration tub and the stirrer in the same direction, the clutch and the buoyancy box used for switching between the washing process and the dehydration process as in the related art are removed, and when the power is switched, An object of the present invention is to provide a power transmission device for a washing machine that prevents a malfunction from occurring.

Another object of the present invention is to provide a mechanical brake instead of removing the clutch so that when a power failure occurs during a high-speed and intermittent dehydration process, the device is operated by the spring force of the spring without power supply. It is an object of the present invention to provide a power transmitting device for a washing machine in which a washing / dehydrating tub is instantaneously and rapidly braked by a brake means device.

Still another object of the present invention is to provide a washing / dewatering tub that is directly rotated by a motor shaft without passing through a speed reducer during the washing process and is rotated in the same direction while being rotated in the opposite direction. It is an object of the present invention to provide a power transmitting device for a washing machine capable of enhancing the washing power of laundry, as well as enhancing the flow of water by balancing the power with the machine.

[0028]

SUMMARY OF THE INVENTION A power transmission device for a washing machine according to the present invention, which has been made to achieve the above-mentioned object, comprises:・ The dewatering tubs are rotated in opposite directions to each other.
In a power transmission device of a washing machine configured to rotate a dehydration tub in the same direction and at the same speed, the washing machine is fitted at a predetermined height on an outer periphery of the motor shaft, and
A dewatering shaft that is press-fitted and fixed to the rotation center of the dewatering tub and is rotated integrally with the washing / dewatering tub, and the dewatering shaft is rotated in the same direction by inertia when the motor shaft is rotated during a washing process. Simultaneously interlocking the washing and dewatering tubs, when the motor shaft and the dehydrating shaft are rotated by different speed differences, the decelerator is decelerated and rotated in the opposite direction to the washing and dewatering tubs, When the motor shaft is gradually rotated at low speed in the initial stage with no clutch during the stroke, the spinning shaft is rotated in the same direction by the inertia force when the motor shaft is accelerated and rotated. When the shaft and the spinning shaft are rotated at the same speed, the intermediary between the motor shaft and the spinning shaft is reduced so that the shaft and the spinning shaft are rotated in the same direction and at the same speed as the washing and spinning tub without decelerating the stirrer. When And one or more of the oil-less bearing,
It is characterized by having.

In the power transmission device for a washing machine according to the present invention, the agitator and the washing / dehydrating tub are rotated in opposite directions in the outer tub during the washing process, and the agitator and the washing / drying tub are rotated in the outer tub during the spinning process. A power transmission device for a washing machine configured to rotate the dewatering tub in the same direction and at the same speed, wherein the motor provided on the outside of the lower portion of the outer tub and the first motor shaft of the motor are always in the same direction; A second motor shaft provided at an upper end of the first motor shaft so as to be rotated to the first motor shaft; and a second motor shaft provided at an upper end of the second motor shaft so as to switch the rotation in a direction opposite to the second motor shaft during a washing process. A speed reducer, a third motor shaft provided at the upper end of the speed reducer so as to rotate the stirrer while being rotated by being reduced by the speed reducer, and rotating in the same direction and at the same speed as the washing / dehydrating tub. The third as A dewatering shaft rotatably fitted to the outer periphery of the motor shaft and press-fitted and fixed to the rotation center of the washing / dewatering tub; and a lower carrier of the speed reduction means fitted to the outer periphery of the second motor shaft. And the brake drum that connects the dewatering shafts to rotate in the same direction and at the same speed, and the same washing and dewatering tub due to inertia when the first and second motor shafts are rotated during the washing process. While rotating in the direction, the first and second motor shafts and the lower carrier are rotated in a direction opposite to the washing and dewatering tub, the agitator being rotated at a reduced speed due to the mutually different speed difference,
In addition, during the dehydration process, the first
And after the second motor shaft is gradually rotated at a low speed,
When the first and second motor shafts and the lower carrier are rotated in the same direction and at the same speed by inertia while being accelerated, the third motor shaft is not decelerated and the stirrer is moved in the same direction as the washing / dewatering tub. At least one or more oilless bearings interposed between the first and second motor shafts and the lower carrier so as to rotate at the same speed.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to the accompanying drawings. Incidentally, in the drawings, the same parts as those of the conventional configuration are denoted by the same names and reference numerals, and the detailed description attached thereto is omitted.

The power transmission means 100a of the present invention is configured such that a motor shaft 61 rotates at the center of rotation of the outer tub 2 by receiving the power of a motor 62.
Is a stator 62a that forms a magnetic field when power is applied thereto, and the stator 6a is affected by the magnetic field formed by the stator 62a.
A rotor 62b rotates inside 2a, and the motor shaft 61 is pressed into the inner peripheral surface of the rotor 62b to rotate.

The upper and lower sides of the motor 62 are
And lower cover flanges 62c, 6
2d is fastened by a fastening member 63a, and the upper cover flange 62c is fastened to a lower end surface of the outer tub 2 by a fastening member 63a.
b.

The outer periphery of the motor shaft 61 is press-fitted to the center of rotation of the washing / dehydrating tub 6 so as to interlock the washing / dehydrating tub 6, and is fitted to the motor shaft 61 via upper and lower oilless bearings 64a, 64b. A dehydrating shaft 65 is provided which is combined with and linked to the dehydrating shaft 65.
The nut 6 is fastened with a nut 66 so as to prevent the washing / dehydrating tub 6 from being detached while rotating, and water leaks between the outer periphery of the upper end of the motor shaft 61 and the inner periphery of the upper end of the dehydrating shaft 65. To prevent this, an oil seal 69 is press-fitted and provided.

At this time, as shown in FIG. 8, the motor shaft 61 and the dehydrating shaft 65 are attached to the lower oilless bearing 64b.
A cylindrical surface 640 interposed between the peripheral surfaces of
At the lower end of the cylindrical surface 640, the dewatering shaft 65 is used during the dewatering process.
A horizontal bent surface 641 is formed between the lower horizontal portions where the dehydrating shaft 65 and the motor shaft 61 are in contact with each other so as to generate frictional resistance due to pressurization caused by gravity acting on the shaft and cause non-slip.

The outer periphery of the dehydrating shaft 65 at an intermediate height and the outer tub 2
A sealing member 6 that seals between the inner periphery of the rotation center and the inner periphery of the outer tub 2 so that water in the outer tub 2 does not leak, and that rotates the dehydrating shaft 65 separately from the outer tub 2.
7 and a dewatering shaft 6 below the sealing member 67.
5 and the inner circumference of the upper cover flange 62c, and the lower circumference of the motor shaft 61 and the lower cover flange 6
The ball bearings 68 are provided between the inner circumference of the ball bearing 2d.

On the other hand, a lower carrier 70 is fastened to the upper surface of the bottom surface of the washing / dewatering tub 6 by a fastening member 63c.
1 is rotatably supported via a shaft 72, and a sun gear 73 fixed to the motor shaft 61 is provided inside the planetary gear 71.

Outside the planetary gear 71, an internal gear 7
The upper carrier 75 is supported at the upper end of the shaft 72 so as to be connected to the lower carrier 70 via a plurality of shafts 72. A drum 76 is press-fitted and provided between the inner periphery of the rotation center of the drum and the upper inner periphery of the drum 76 and the upper outer periphery of the upper carrier 75 so as to rotate separately from each other. A metal bearing 77 is inserted, and a fastening member 63d for mutually fixing the rotation center of the upper surface of the drum 76 and the rotation center of the stirrer 7 is fastened.

On the other hand, on the outer periphery of the lower end of the dehydrating shaft 65,
A brake drum 80 is provided. A brake band 82 is provided on the outer periphery of the brake drum 80 and is urged by the force of a spring 81 and surrounds and presses the brake drum 80. A brake lever 83 is provided at the end to release the brake band 82 from the brake drum 80 when pulled by a driving force of a brake motor (not shown).

Next, the operation and effect of the first embodiment of the present invention will be described. First, at the time of a washing process or a spin-drying process, when a brake motor (not shown) is supplied with power and pulls the brake lever 83, the brake lever 83 forcibly releases the resilience of the brake spring 81 and releases the brake band 82. As a result, the brake band 82 is detached from the surrounding and pressed brake drum 80, and the dehydrating shaft 65 and the washing / dehydrating tub 6 connected to the brake drum 80 are freely rotatable.

In this state, when the washing process is started, washing water flows into the outer tub 2 and the washing / dewatering tub 6 and the stirrer 7
And acts as a load. At this time, when the power is applied and the motor 62 is operated, the motor shaft 61 connected thereto rotates as the motor 62 is driven, and the planetary gear meshes with the sun gear 73 fixed to the upper end thereof. By rotating the gear 71, the planetary gear 71
Is revolving in the same direction as the motor shaft 61 while rotating in the direction opposite to the motor shaft 61.

That is, the lower carrier 70, the washing / dewatering tub 6, and the dewatering shaft 65 connected to the shaft 72 that supports the rotation of the planetary gear 71 rotate in the same direction as the motor shaft 61, and the planetary gear 71 is an internal gear. By being engaged with 74,
The internal gear 74 is rotated by the rotation force in the direction opposite to the motor shaft 61.
Is rotated in the direction opposite to the motor shaft 61.

Therefore, when the motor shaft 61 is rotated, the dewatering shaft 65 is rotated in the same direction by utilizing the property of rotating due to the inertial force. Since the shaft 65 is rotated, the sun gear 73 and the planetary gear 7 connected to the upper end of the motor shaft 61
1. The power connected to the internal gear 74 and the drum 76 rotates the stirrer 7 in the opposite direction to the motor shaft 61 while decelerating, while the motor shaft 61, the dewatering shaft 65 and the washing / dewatering tub 6 are the same. Rotated in the direction.

At this time, since the dehydrating shaft 65 is rotated by directly transmitting the power of the motor shaft 61, the agitator 7 and the washing / dewatering tub 6 are rotated in opposite directions while rotating in opposite directions. When changing, the power is balanced, thereby generating a strong new water flow and increasing the washing power.

On the other hand, during the dewatering process, the washing / dewatering tub 6
Since there is no clutch for connecting the agitator 7 and the washing / dehydrating tub 6, the washing / dehydrating tub 6 and the agitator 7 must be rotated in the same direction.

That is, when the dewatering process is started, after the washing water in the washing and dewatering tub 6 is drained to the outside, the load acting on the washing and dewatering tub 6 and the stirrer 7 is changed to wet laundry. This load (gravity) is transmitted to the dehydrating shaft 65 that supports the washing / dehydrating tub 6.

At this time, the dewatering shaft 65 is formed between the inner peripheral surface of the dewatering shaft 65 and the outer peripheral surface of the motor shaft 61, especially by the lower horizontal bent surface 641 of the lower oilless bearing 64 b interposed at the lower end. Due to the large gravity, the horizontal bent surface 641 interposed between the lower end of the dehydrating shaft 65 and the step surface of the motor shaft 61 receives strong frictional resistance, and the slip action is reduced.

In this state, when the motor shaft 61 is gradually rotated at a low speed in the initial stage, the upper and lower oilless bearings 64a and 64b interposed between the motor shaft 61 and the dehydrating shaft 65 are provided.
Prior to the occurrence of the slip action, the dewatering shaft 65 is rotated in the same direction as the motor shaft 61 due to the frictional resistance of the laundry placed on the washing / dewatering tub 6 and the stirrer 7 due to gravity.

Here, the dehydrating shaft 65 is transmitted with a delay in the rotation reaction of the motor shaft 61 and is rotated. However, only a very small speed difference is present, and after a certain period of time, the dehydrating shaft 65 becomes the same due to inertial force. , The sun gear 73 and the planetary gear 71 connected to the upper end of the motor shaft 61.
The reduction gears such as the internal gear 74 and the drum 76 are rotated in the same direction without any reduction action.

Therefore, the dewatering shaft 65, the motor shaft 61,
When the speed of the motor shaft 61 is gradually increased when the stirrer 7 and the washing / dewatering tub 6 rotate in the same direction and at the same speed, the dewatering shaft 65 is simultaneously rotated at the same speed and in the same direction, The dewatering is performed by simultaneously rotating the water tank 6 and the stirrer 7 at high speed.

On the other hand, when the pulling force on the brake lever 83 is removed after the spin-drying is completed, the brake band 8
2 is pressed in contact with the outer peripheral surface of the brake drum 80 while being contracted inward by the elastic force of the brake spring 81 to brake the rotation of the brake drum 80. -The rotation of the dewatering tank 6 stops.

Next, a second embodiment of the present invention will be described in detail with reference to FIG. Incidentally, the same configuration and the same configuration as those of the first embodiment of the present invention are denoted by the same names and the same reference numerals, and the detailed description thereof will be omitted.

In the power transmission means 100b of the present invention, the first motor shaft 61a is press-fitted at the center of rotation of the rotor 62b of the motor 62 so as to rotate. A second motor shaft 61b is press-fitted to a certain depth at the upper end rotation center of the shaft 61a so that the power of the first motor shaft 61a is transmitted and rotated. A third motor shaft 61c is provided at the center of rotation of the dewatering tub 6 and the stirrer 7 so that the decelerated power is transmitted from the second motor shaft 61b and rotated.

That is, a lower carrier 70a is provided on the outer periphery of the second motor shaft 61b via a lower oilless bearing 64c, and a plurality of planetary gears 71 are mounted on the upper portion of the lower carrier 70a. 72 and rotatably supported via the planetary gear 71.
And a sun gear 73 fixed to the motor shaft 61b.

At this time, the lower oilless bearing 64c
As shown in FIG. 8, a cylindrical surface 640 interposed between the second motor shaft 61b and the peripheral surface of the lower carrier 70a is formed. The horizontal bending surface 641 interposed between the lower horizontal portion where the lower carrier 70a and the first motor shaft 61a are in contact with each other so that the lower carrier 70a is pressed by the gravity acting on the lower carrier 70a to cause frictional resistance to cause non-slip. Are formed.

Outside the planetary gear 71, an internal gear 7
The upper carrier 75a is supported on the upper end of the shaft 72 so as to be connected to the lower carrier 70a via a plurality of shafts 72. A drum 76 is provided on the outer periphery of the lower end of the motor shaft 61c.
a is press-fitted and provided.

On the other hand, an upper housing 90 is fixed at the center of the outer surface of the bottom surface of the outer tub 2 via a plurality of fastening members 63e, and a lower housing 91 is provided on the lower surface of the upper housing 90. The upper surface of the lower housing 91 is connected to the housing 90, and the lower end of the lower housing 91 is connected to the lower carrier 90a.
Is connected to the outer peripheral surface of the ball bearing 68 interposed on the lower outer peripheral surface.

Further, the outer periphery of the third motor shaft 61c is press-fitted into the rotation center of the washing / dehydrating tub 6 to interlock the washing / dehydrating tub 6, and via upper and lower oilless bearings 64a, 64b. A dewatering shaft 65a fitted and interlocked with the third motor shaft 61c is provided on the outer periphery of the middle height of the dehydration shaft 65a. A stop ring 92 is fixed so that the water tank 6 is positioned at a predetermined height without being lowered, and water is leaked between the outer periphery of the upper end of the third motor shaft 61c and the inner periphery of the upper end of the dehydrating shaft 65a. To prevent this, an oil seal 69 is press-fitted and provided.

A seal is provided below the stop ring 92 between the outer periphery of the dewatering shaft 65a and the inner periphery of the rotation center of the outer tub 2 so as to prevent water in the outer tub 2 from leaking. A sealing member 67 for supporting the outer tub 2 so as to be rotated separately is provided, and a brake drum 80a is provided between the outer periphery of the lower end of the dehydrating shaft 65a and the outer periphery of the lower carrier 70a.
A ball bearing 68 is interposed between the outer periphery of the upper end of the brake drum 80a and the inner periphery of the upper end of the upper housing 90 so that the brake drum 80a is rotatably supported.

At this time, a brake band 82 which is urged by the force of a spring 81 and surrounds and presses the brake drum 80a is provided on the outer periphery of the brake drum 80a.
Brake levers 83 are provided on both side ends of the brake band 82 so as to separate the brake band 82 from the brake drum 80a when pulled by a driving force of a brake motor (not shown).

Next, the operation and effect of the second embodiment of the present invention will be described in detail. Incidentally, the brake device allows the dehydrating shaft 65a and the washing / dewatering tub 6 to freely rotate at the time of the washing process or at the start of the dehydrating process, similarly to the first embodiment of the present invention, and the dehydrating process is terminated. Since the rotation of the washing / dehydrating tub 6 is stopped by braking the dehydrating shaft 65a, the first to third motors having a configuration different from that of the first embodiment of the present invention will be described below for convenience of description. Shaft 61
Only the interlocking relationship between a, 61b and 61c and the rotation direction of the washing / dewatering tub 6 and the stirrer 7 will be described.

During the washing process, when the first motor shaft 61a connected to the motor 62 rotates as the motor 62 is driven,
The first motor shaft 61a rotates the second motor shaft 61b fixed to the upper end thereof in the same direction and at the same speed. The second motor shaft 61b is connected to the sun gear 73 fixed to the outer periphery of the upper end. By rotating the meshed planetary gear 71, the planetary gear 71 is rotated by the second motor shaft 6.
1b, while rotating in the opposite direction to the second motor shaft 6 at the same time.
Revolves in the same direction as 1b.

That is, the lower carrier 70a connected to the shaft 72 supporting the rotation of the planetary gear 71 rotates the brake drum 80a → the dehydrating shaft 65a → the washing / dehydrating tub 6 simultaneously in the same direction and at the same speed. The internal gear 74 connected to the planetary gear 71 so as to rotate in the same direction as the second motor shaft 61b rotates the drum 76a → the third motor shaft 61c → the stirrer 7 simultaneously in the same direction and at the same speed. And the second motor shaft 61b
By rotating the stirrer in the opposite direction to
The dewatering tubs 6 are rotated in opposite directions to each other to generate a strong flow of a fresh water flow, similarly to the effect of the first embodiment of the present invention, thereby increasing the washing power.

On the other hand, during the dehydration step, the first of the present invention is used.
As in the embodiment, since there is no clutch for connecting the washing / dewatering tub 6 and the stirrer 7, the washing / dewatering tub 6 and the stirrer 7 are not provided.
Should be rotated in the same direction.

That is, if the washing water in the washing / dewatering tub 6 is drained to the outside before the start of the dehydrating process,
And the load acting on the stirrer 7 remains as wet laundry, and the load (gravity) is transmitted to the dehydrating shaft 65a supporting the washing / dehydrating tub 6.

At this time, the gravity acting on the dewatering shaft 65a is changed from the dewatering shaft 65a → the brake drum 80a → the lower carrier 70
The transmission from a to the oilless bearing 64c imparts a strong frictional resistance to the horizontal bent surface 641 at the lower end of the lower oilless bearing 64c to reduce the slip action.

In this state, when the first and second motor shafts 61a and 61b are gradually rotated at a low speed in the initial stage, the lower oilless shaft interposed between the first motor shaft 61a and the lower carrier 70a is reduced. Horizontally bent surface 641 of bearing 64c
Washing and dewatering tub 6 and stirrer 7 prior to slipping
The non-slip is generated by the frictional resistance due to the gravity of the wet laundry placed on the
And the first and second motor shafts 61a and 61b are rotated in the same direction.

Here, the lower carrier 70a is transmitted with a delay from the rotation reaction of the first and second motor shafts 61a, 61b and is rotated. Later, because of the inertial force, they rotate at the same speed, so that the sun gear 73 provided between the second motor shaft 61b and the third motor shaft 61c,
The speed reducers such as the planetary gear 71, the internal gear 74, and the drum 76 do not have any speed reduction action, and are also rotated in the same direction, while being rotated through the third motor shaft 61c.
Are rotated in the same direction.

Therefore, the first to third motor shafts 6
After a certain period of time, 1a, 61b, 61c and the dehydrating shaft 65a rotate at the same speed and at the same speed while simultaneously rotating the washing / dehydrating tub 6 and the stirrer 7 to perform dehydration.

Next, a second embodiment of the present invention will be described in detail with reference to FIG. Incidentally, the same components as those of the conventional configuration and the first and second embodiments of the present invention are denoted by the same names and the same reference numerals, and the detailed description thereof will be omitted.

In the power transmission means 100c according to the third embodiment of the present invention, the drum 76a used in the power transmission means 100b according to the second embodiment of the present invention is omitted, and the internal gear 74 is replaced with the brake drum 80a. Shaft 7 fixed to the inner peripheral wall of the shaft 7 and supporting the rotation of the planetary gear 71
The upper surface of the upper carrier 75a connected to the second motor shaft 61 is fixed to the outer peripheral surface of the lower end of the third motor shaft 61c.

Next, the operation and effect of the third embodiment of the present invention will be described. Incidentally, similarly to the first and second embodiments of the present invention, the brake device allows the dehydrating shaft 65a and the washing / dewatering tub 6 to freely rotate at the time of the washing process or at the start of the dehydrating process, and the dehydrating process is completed. Then, since the rotation of the washing / dehydrating tub 6 is stopped by braking the dehydrating shaft 65a, for the sake of convenience of the description, the first to third configurations different from the first embodiment of the present invention will be described below. Motor shaft 61
Only the interlocking relationship between a, 61b and 61c and the rotation direction of the washing / dewatering tub 6 and the stirrer 7 will be described.

When the motor 62 is driven during the washing process, the first and second motor shafts 61a and 61b are simultaneously rotated, and the second motor shaft 61b is rotated by the sun gear 73 → the planetary gear 71 → the shaft 72 → the upper part. The carrier 75a → the third motor shaft 61c → the stirrer 7 is rotated in the same direction.

The internal gear 74 meshed with the planetary gear 71 simultaneously rotates the brake drum 80a → the dehydrating shaft 65a → the washing / dehydrating tub 6 in the same direction and at the same speed, and simultaneously rotates the second motor shaft 61b. It will rotate in the opposite direction.

Therefore, the stirrer 7 and the washing / dewatering tub 6
Although the rotation direction is changed mutually with the first and second embodiments of the present invention, they are substantially rotated in the opposite directions, and the strong new water flow is generated similarly to the effect of the first embodiment of the present invention. The flow can be generated to increase the washing power.

Since the dewatering process is the same as that of the second embodiment of the present invention, a description of its operation and effect will be omitted.

[0076]

As described above, according to the power transmission device for a washing machine according to the first to third embodiments of the present invention, when the motor shaft is rotated, the washing process is performed according to the inertia force proportional to the initial rotation speed. Sometimes, while the motor shaft and the washing / dehydrating tub are rotated in the same direction, so that they are rotated in the opposite direction to the stirrer, so that washing is performed, or
The washing and dewatering tub and the stirrer can be rotated together with the motor shaft in the same direction during the dewatering process, so the clutch and buoyancy box used to switch between the washing and dewatering processes as in the past have been removed. This has the effect of preventing malfunctions at the time of power switching.

In addition, since a mechanical brake is provided instead of removing the clutch, when a power failure occurs during a high-speed and intermittent dehydration process, the brake is operated by the spring force of the spring without power supply. The device has the effect that the washing / dehydrating tub can be immediately and rapidly braked.

Further, during the washing process, the washing / dewatering tub is transmitted directly from the motor shaft without passing through the speed reducer, and is rotated in the same direction, while balancing the power with the agitator rotating in the opposite direction. As a result, not only can the flow of the water flow be strengthened, but also the washing power of the laundry can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a conventional washing machine.

FIG. 2 is an enlarged vertical sectional view of a main part showing an operation state during washing of a conventional washing machine.

FIG. 3 is an enlarged longitudinal sectional view of a main part showing an operation state during dehydration of a conventional washing machine.

FIG. 4 is an enlarged exploded perspective view showing a conventional power interrupting means of the washing machine.

FIG. 5 is a longitudinal sectional view showing a clutchless power transmission device of the washing machine according to the first embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a clutchless power transmission device of a washing machine according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a clutchless power transmission device of a washing machine according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing a shape of a lower oilless bearing applied to the first to third embodiments of the present invention.

[Explanation of symbols]

 2 Outer tub 6 Washing / dewatering tub 7 Stirrer 61 Motor shaft 61a First motor shaft 61b Second motor shaft 61c Third motor shaft 62 Motor 64b Lower oilless bearing 64c Lower oilless bearing 640 Cylindrical surface 641 Horizontal bent surface 65 Dewatering shaft 65a Dewatering shaft 70 Lower carrier 70a Lower carrier 80 Brake drum 80a Brake drum

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[Procedure amendment]

[Submission date] October 21, 1999 (1999.10.
21)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Power transmission device of a washing machine

[Claims]

6. An agitator and a washing / dewatering tub during the washing process.
Rotate them in the opposite direction to each other,
The dehydration tub should be rotated in the same direction and at the same speed.
In the power transmission device for a washing machine, a first rotating shaft that is rotated by receiving the power of a motor and a second rotating shaft that is provided at an upper end of the first rotating shaft and that is simultaneously rotated.
A second rotating shaft and a third rotating shaft provided in the stirrer and rotated simultaneously
And provided at the lower end of the third rotating shaft and rotated simultaneously.
And a lower key provided on the outer periphery of the second rotating shaft and rotated.
Carrier, the third rotating shaft and the washing / dewatering tub.
A dewatering shaft that is rotatable and rotated; and a lower carrier provided between the lower carrier and the dewatering shaft.
And the dehydrating shaft are rotated simultaneously in the same direction and at the same speed.
Brake drum, and a sun tooth provided and rotated on an outer periphery of the second rotation shaft.
A car, an inscribed gear provided on the inner periphery of the brake drum, and a rotation between the upper carrier and the lower carrier via a shaft.
The sun gear and the internal gear
And a third axis of rotation
The second rotating shaft is rotated at a reduced speed from the second rotating shaft.
A plurality of planetary gears for rotating in a direction opposite to the direction of rotation of the first and second rotating shafts and a lower carrier;
At least one or more oilless bearings
A power transmission device for a washing machine.

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a washing machine, and more particularly, to the same washing and washing machine as an existing washing machine without a clutch for switching power between a washing process and a dehydration process. Dehydration can be performed,
The present invention relates to a power transmission device for a washing machine that generates a new water flow (high-pressure water flow) during a washing process.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 1, a conventional washing machine includes an outer tub 2 and a
A water supply means 8 for supplying washing water to the inside of the dewatering tub 6 is mounted, and a drainage means 9 for discharging the washing water in the washing / dewatering tub 6 to the outside is mounted at one lower end thereof. ing.

At the lower end of the water supply means 8, there is provided a detergent dissolving means 10 for dissolving the supplied detergent by water supply and supplying it to the outer tub 2 and the washing / dewatering tub 6 together with the washing water. Have been.

On the bottom surface of the washing / dewatering tub 6, the flow of the washing water in the washing / dewatering tub 6 is made turbulent while being turned left and right by the transmission of power, and the laundry is physically urged. A stirrer 7 for performing stirring and washing is mounted.

At the center of the outer tub 2, there is provided a rotary shaft 11 connected to the stirrer 7, and to the outside of the rotary shaft 11 is connected the washing / dewatering tub 6 which rotates at a high speed during the spin-drying process. The dewatering shaft 12 is inserted, and a power generating means 3 for generating power to rotate the rotating shaft 11 and the dewatering shaft 12 by an applied power source is provided on the outer bottom surface of the outer tub 2.

[0006] As is known, the rotary shaft 11, in FIG. 1
Driven by a directly connected motor or other conventional
Power is transmitted by V-belt and pulley as shown in the example.
And may be driven by another motor.

[ 0007 ] That is, the power transmission means 3 is disclosed in Japanese Patent Application No. 98-26456 (filing date:
It was already filed with the Korean Patent Office as July 1, 1998). That is, as shown in FIGS. 2 to 4, the power transmission means 3 is configured such that the rotation shaft 11 rotates at the center of rotation of the outer tub 2 by transmitting the power of a motor 31. A stator 31a that forms a magnetic field when a power is applied thereto, and a rotor 3 that rotates inside the stator 31a under the influence of the magnetic field formed by the stator 31a.
1b, and the rotating shaft 11 is pressed into the inner peripheral surface of the rotor 31b to rotate.

[0008] in the upper and lower side of the motor 31, motor 31
Upper and lower cover flanges 31c, 3
1d is fastened by a fastening member 32a, and the upper cover flange 31c is fastened to a lower end surface of the outer tub 2 by a fastening member 32a.
b.

[0009] inside of the outer tub 2, together with the water in the outer tub 2 is sealed so as not to be leaked between an outer peripheral surface of the rotary shaft 11, it is rotated separately rotating shaft 11 and the outer tub 2 The inner ring is pressed into the outer peripheral surface of the rotating shaft 11 below the sealing member 33, and the outer ring is connected to the upper and lower cover flanges 31c and 31d.
The ball bearing 34 is press-fitted on the inner peripheral surface of the ball bearing.

[0010] The on the rotating shaft 11, laundry drying tub flanges 6a to work with laundry drying tub 6 is provided, washing and drying tub flange from the rotation axis 11 on the upper portion of the washing and dewatering tank flange 6a The nut 35 is fastened so as to prevent the 6a from being detached while rotating.
A lower carrier 36 is fastened to the upper surface of the dewatering tank flange 6a by a fastening member 32c.

[0011] The lower carrier 36 has a plurality of planetary gears 37 is supported through a shaft 38, planetary gear 3
7 has a sun gear 39 meshed with the rotating shaft 11.
An internal gear 40 meshes with the outside of the planetary gear 37, and an upper carrier 41 has a plurality of shafts 38 above a shaft 38 connecting the lower carrier 36.
It is supported by.

[0012] the outer peripheral surface of the internal gear 40, the drum 4
2 is press-fitted, and a metal bearing 43 is inserted into the upper inner peripheral surface of the drum 42 so as to rotate separately from the upper carrier 41. The stirrer 7 for stirring the washing water and the laundry in the washing / dewatering tub 6 is fixed with a nut 44 for fastening the upper part of the drum 42.

[0013] Here, the upper inner peripheral surface of the drum 42 and the lower clutch 45 is formed, said lower clutch 4
A buoyancy box 46 which moves up and down by buoyancy acting according to the presence or absence of the washing water is provided on the upper side of 5, and a connecting rod 47 connected to the lower side of the buoyancy box 46 is connected.

[0014] The connection to the lower end of the rod 47 and the upper clutch 48 is provided to be engaged with the lower clutch 45, the center upper portion of the agitator 7 so that a constant rise height of the buoyancy box 46 Buoyancy box cover 49 is provided.

[0015] top end of the rotary shaft 11 is engaged with the upper clutch 48 is formed with rectangular section 50 formed by polygonal or spline-shaped.

Furthermore, the during of the outer peripheral surface of the rotary shaft 11 and the washing-drying tub flanges 6a, the sleeve 51 to slide is inserted into each other.

[0017] Stated conventional action configured song, first, when applying a power to the motor 31 to rotate the rotary shaft 11 during the washing process, which is formed on the upper end outer peripheral surface to the rotary shaft 11 The sun gear 39 rotates, and the plurality of planetary gears 37 meshed with the sun gear 39 rotate in the opposite direction to the sun gear 39, so that the internal gear meshed with the outer periphery of the planetary gear 37. 36 rotates at a reduced rotation speed in the same direction as the planetary gear 37, and the drum 42, which is interlocked with the outer peripheral surface of the internal gear 36, rotates and is fixed to the outer periphery of the drum 42. The stirrer 7 rotates interlockingly with the rotating shaft 11 in directions different from each other.

Furthermore, the upper and lower carrier connecting the shaft 38 of the planetary gear 37 at the top and bottom 41,3
Numeral 6 rotates the washing / dewatering tub flange 6a fastened to the lower carrier 36 by the fastening member 32c and rotates the washing / dewatering tub 6 at a rotation speed reduced from the rotating shaft 11. .

[0019] That is, when the washing process, the washing-drying tub 6 and agitator 7 is to perform the washing by rotating in the opposite direction to each other.

[0020] on the one hand, the washing and de-water tank As the dehydration step 6
When the washing water is drained into the buoyancy box 50, the buoyancy box 50 descends, and the upper clutch 48 formed at the lower end thereof moves to the upper carrier 41.
Is engaged with the lower clutch 45 formed at the bottom.

[0021] In this state, the when the rotary shaft 11 rotates at a high speed, the upper carrier 41 which is the upper clutch 48 and the clutch ring is adapted to high speed rotation, upper carrier 4
The lower carrier 36 is rotated by the shaft 38 connected to 1, and the washing / dewatering tub flange 6a and the washing / dewatering tub 6 rotate at a high speed to dehydrate the laundry.

[0022] That is, at the time of dehydration step, the sun gear 3
9, the planetary gear 37 and the inscribed gear 40 rotate integrally with each other in a meshed state, and the drum 42 and the agitator 7 simultaneously rotate in the same direction.

[ 0023 ]

In the conventional power transmitting device for a washing machine constructed as described above, the upper clutch 48 is moved as the buoyancy box 46 is raised or lowered in order to switch the power to the washing process or the dehydrating process. And the lower clutch 45 are separated or connected in an uneven shape. However, in the power switching method of such a structure, since the buoyancy box 46 is used for a long time in water, the water scale generated at the operation portion of the buoyancy box 46 is used. As a result, the buoyancy box 46 does not move up and down smoothly due to foreign matters such as debris and the like, so that the washing process or the dewatering process is not smooth and a malfunction occurs.

Further , the power transmission device of the conventional washing machine uses the back electromotive force of the motor 31 for rapid braking when the agitator 7 and the washing / dewatering tub 6 are simultaneously rotated in the same direction at a high speed during the dewatering process. Although such a braking system is used, there is a problem that such a braking system does not have a mechanical braking means, so that sudden braking cannot be performed at the time of a power failure.

Furthermore, the power of the sun gear 39 of the washing-drying tub 6 when conventional washing stroke rotary shaft 11, the planetary gear 37,
The rotation of the rotating shaft 11 is substantially smaller than the rotation speed (rpm) of the rotating shaft 11 because the rotating shaft 11 is transmitted and rotated through a speed reducer composed of the internal gear 40 and the like. When the dewatering tubs 6 are rotated in opposite directions, the flow of the water flow generated due to the imbalance between the forward and reverse rotations is weakly formed, thereby significantly reducing the washing power of the laundry. there were.

[ 0026 ]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned various problems, and an object of the present invention is to provide a motor having an inertia force proportional to an initial rotation speed when a rotating shaft is rotated. Washing is performed by rotating the rotating shaft and the washing / dewatering tub in the same direction during the washing process and rotating in the opposite direction to the stirrer, or washing with the rotating shaft during the spinning process.・ By performing dehydration by rotating the dehydration tub and the stirrer in the same direction, the clutch and buoyancy box used for switching between the washing process and the dehydration process as in the related art are removed, and when the power is switched, An object of the present invention is to provide a power transmission device for a washing machine that prevents a malfunction from occurring.

[0027] Another object of the present invention is operated by mechanical brake means provided when it becomes a power failure during high-speed and intermittent dehydration step, the elastic force of the spring without power supply, instead of removing the clutch It is an object of the present invention to provide a power transmitting device for a washing machine in which a washing / dehydrating tub is instantaneously and rapidly braked by a brake means device.

[0028] Still another object of the invention is, agitation washing and drying tub during the washing stroke while being rotated in the same direction is transmitted to directly power from the rotating shaft without passing through the reduction gear, it is rotated in the opposite direction It is an object of the present invention to provide a power transmitting device for a washing machine capable of enhancing the washing power of laundry, as well as enhancing the flow of water by balancing the power with the machine.

[ 0029 ]

Power transmission device of a washing machine according to the present invention made in order to achieve the above object, according to an aspect of has an agitator and is decelerated by the reduction means the rotation of the rotary shaft at the time of the washing operation the washing A power transmission device for a washing machine configured to rotate the dewatering tubs in mutually opposite directions and to rotate the stirrer and the washing / dewatering tubs in the same direction and at the same speed by the rotary shaft during the dewatering process ; A dehydrating shaft which is fitted at a predetermined height on the outer circumference of the washing and dewatering tub, is press-fitted and fixed to the rotation center of the washing and dewatering tub, and is rotated integrally with the washing and dewatering tub, and the rotating shaft is rotated during the washing process. that time, along with the interlocking said dewatering shaft the laundry drying tub is rotated in the same direction at the same time due to the inertial force, the rotation
When rotated by the mutually different speed difference between the shaft and the dewatering shaft, wherein the rotated stirrer and then decelerates to a washing and dehydrating tub in the opposite direction, further rotary shaft initially in the absence of the clutch when dewatering stroke When rotated slowly at low speed and then accelerated, the spinning shaft is rotated in the same direction by the inertia force to simultaneously link the washing and spinning tubs, and the rotating shaft and spinning shaft are rotated at the same speed. At least one or more oilless bearings interposed between the rotating shaft and the dewatering shaft so that the agitator is rotated in the same direction and at the same speed as the washing / dewatering tub without decelerating the stirrer. It is characterized by.

Further, the washing machine of the power transmission device of the present invention, during the washing operation to each other is rotated in the opposite direction the laundry drying tub and agitator in the outer tub, the dehydration process and stirrer in the outer tub washing A power transmission device for a washing machine configured to rotate the spin-drying tub in the same direction and at the same speed, wherein a motor provided on a lower outer side of the outer tub and a first rotating shaft of the motor are always in the same direction; First rotation to be rotated to
Second and rotary shaft, a second round so as to switch the rotational direction opposite to the the second axis of rotation during the washing process provided at the upper end of the shaft
A speed reducing means provided at an upper end of the rotating shaft ; a third rotating shaft provided at an upper end of the speed reducing means to rotate the agitator while being rotated at a reduced speed by the speed reducing means;
While being rotatably fitted to the outer periphery of the third rotating shaft so as to be rotated in the same direction and at the same speed as the dehydration tub,
The dewatering shaft press-fitted and fixed to the rotation center of the washing / dewatering tub, the lower carrier of the reduction means fitted to the outer periphery of the second rotation shaft , and the dehydration shaft are rotated in the same direction and at the same speed. a brake drum coupled to, when the first and second rotation shafts are rotated during the washing process, the washing and drying tub is rotated in the same direction by the inertial force, the first and second axis of rotation The agitator rotated at a reduced speed due to the different speed difference between the lower carrier and the lower carrier is rotated in a direction opposite to the washing / dehydrating tub, and further, the first and second rotating shafts are initially provided without a clutch during the dehydrating process. When the first and second rotating shafts and the lower carrier are rotated in the same direction and at the same speed by inertia while being accelerated after being gradually rotated at a low speed, the third rotating shaft is not decelerated and the stirrer is not rotated. But washing Characterized in that it comprises at least one or more oil-less bearing interposed between the first and second axis of rotation and a lower carrier to be rotated in a water tank in the same direction and the same speed.

[ 0031 ]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to the accompanying drawings. Incidentally, in the drawings, the same parts as those of the conventional configuration are denoted by the same names and reference numerals, and the detailed description attached thereto is omitted.

The power transmission means 100a of the present invention, the rotation center of the outer tub 2 has rotating shaft 61 is adapted to rotate by transmitting the power of the motor 62, the motor 62 is applied the power A stator 62a for forming a magnetic field, and a stator 62a formed by the influence of the magnetic field formed by the stator 62a.
The rotating shaft 61 is press-fitted into the inner peripheral surface of the rotor 62b and rotates.

[0033] in the upper and lower side of the motor 62, motor 62
And lower cover flanges 62c, 6
2d is fastened by a fastening member 63a, and the upper cover flange 62c is fastened to a lower end surface of the outer tub 2 by a fastening member 63a.
b.

The outer periphery of the rotary shaft 61 causes has been interlocking the washing and dewatering tank 6 press-fitted into the rotation center of the laundry drying tub 6, fitted on the upper and lower oil-less bearing 64a, the rotary shaft 61 through the 64b A dehydrating shaft 65 is provided, which is coupled and interlocked, and is fastened with a nut 66 on the outer periphery of the upper end of the dehydrating shaft 65 so as to prevent the washing / dehydrating tub 6 from being detached while rotating from the dehydrating shaft 65. An oil seal 69 is press-fitted between the outer periphery of the upper end of the rotating shaft 61 and the inner periphery of the upper end of the dehydrating shaft 65 so as to prevent water leakage.

[0035] In this case, the lower oil-less bearing 64b, as shown in FIG. 8, are cylindrical surfaces 640 formed to be interposed between the peripheral surface of the dewatering shaft 65 and the rotary shaft 61, the cylinder The lower end of the surface 640 is interposed between the lower horizontal portion where the dehydrating shaft 65 and the rotating shaft 61 are in contact with each other so that the non-slip occurs due to the frictional resistance caused by the pressure exerted on the dehydrating shaft 65 during the dehydrating process. Horizontal bent surface 641 is formed.

The outer periphery of the mid-height of the dewatering shaft 65 and the outer tub 2
A sealing member 6 that seals between the inner periphery of the rotation center and the inner periphery of the outer tub 2 so that water in the outer tub 2 does not leak, and that rotates the dehydrating shaft 65 separately from the outer tub 2.
7 and a dewatering shaft 6 below the sealing member 67.
5 and the inner circumference of the upper cover flange 62c, and the outer circumference of the lower end of the rotating shaft 61 and the lower cover flange 62.
Ball bearings 68 are respectively provided between the inner periphery of d and the inner periphery of d.

[0037] On the other hand, on the bottom upper surface of the washing-drying tub 6, the lower carrier 70 is fastened by a fastening member 63c, a plurality of planet gears 7 to the upper portion of the lower carrier 70
1 is rotatably supported via a shaft 72, and a sun gear 73 fixed to the rotating shaft 61 is provided inside the planetary gear 71.

[0038] On the outside of the planetary gear 71, internal gear 7
The upper carrier 75 is supported at the upper end of the shaft 72 so as to be connected to the lower carrier 70 via a plurality of shafts 72. A drum 76 is press-fitted and provided between the inner periphery of the rotation center of the drum and the upper inner periphery of the drum 76 and the upper outer periphery of the upper carrier 75 so as to rotate separately from each other. A metal bearing 77 is inserted, and a fastening member 63d for mutually fixing the rotation center of the upper surface of the drum 76 and the rotation center of the stirrer 7 is fastened.

[0039] On the other hand, the outer periphery of the lower end of the dewatering shaft 65,
A brake drum 80 is provided. A brake band 82 is provided on the outer periphery of the brake drum 80 and is urged by the force of a spring 81 and surrounds and presses the brake drum 80. A brake lever 83 is provided at the end to release the brake band 82 from the brake drum 80 when pulled by a driving force of a brake motor (not shown).

Next, described operation and effects of the first embodiment of the invention configured song. First, at the time of a washing process or a spin-drying process, when a brake motor (not shown) is supplied with power and pulls the brake lever 83, the brake lever 83 forcibly releases the resilience of the brake spring 81 and releases the brake band 82. As a result, the brake band 82 is detached from the surrounding and pressed brake drum 80, and the dehydrating shaft 65 and the washing / dehydrating tub 6 connected to the brake drum 80 are freely rotatable.

[0041] Such a state, when starting the washing process, stirrer 7 and laundry drying tub 6 wash water in the outer tub 2 is flowed
And acts as a load. At this time, when the power is applied and the motor 62 is operated, the rotating shaft 61 connected thereto rotates as the motor 62 is driven, and the rotating shaft 61 is engaged with the planetary gear meshed with the sun gear 73 fixed to the upper end thereof. By rotating the gear 71, the planetary gear 71 rotates in the opposite direction to the rotation shaft 61 while simultaneously rotating the rotation shaft 6.
It revolves in the same direction as 1.

[0042] That is, the lower carrier 70 is connected to the shaft 72 for supporting the rotation of the planetary gears 71, washing and dewatering tank 6, the dewatering shaft 65 is rotated in the same direction as the rotation shaft 61, the planetary gear 71 is an internal gear by being 74 mesh, times
The internal gear 74 rotating by the rotation force of the rotation shaft 61 in the opposite direction
It is rotated in the direction opposite to the turning shaft 61.

[0043] Thus, when the rotational shaft 61 is rotated,
For dewatering shaft 65 but is rotated in the same direction by utilizing the property to be rotated with the inertial force, the dewatering shaft 65 is rotated from the rotational speed of the rotary shaft 61 at a low speed, the upper end of the rotary shaft 61 linked sun gear 73, planetary gears 71, the internal gear 74, power is coupled to the drum 76 is brought to rotate the agitator 7 being decelerated to the rotation axis 61 opposite direction, whereas the rotary shaft 61 spinning shaft 65 and washing and dewatering tub 6
Are rotated in the same direction.

[0044] At this time, since the dewatering shaft 65 which is rotated by directly transmitting the power of the rotary shaft 61, the agitator 7 as laundry drying tub 6 forward and reverse rotation to each other while being rotated in the opposite direction to each other When changing, the power is balanced, thereby generating a strong new water flow and increasing the washing power.

[0045] On the other hand, during the dehydration process, the washing and de-water tank 6
Since there is no clutch for connecting the agitator 7 and the washing / dehydrating tub 6, the washing / dehydrating tub 6 and the agitator 7 must be rotated in the same direction.

[0046] That is, when the dehydration step is started, after the washing water of the washing-drying tub 6 is drained to the outside, as a laundry wet load on the agitator 7 as laundry drying tub 6 This load (gravity) is transmitted to the dehydrating shaft 65 that supports the washing / dehydrating tub 6.

[0047] At this time, the dewatering shaft 65, against between the inner surface and the outer circumferential surface of the rotary shaft 61 of the spinning shaft 65, especially,
The horizontal folding surface 641 interposed between the lower end of the dehydrating shaft 65 and the step surface of the rotating shaft 61 by receiving greater gravity from the lower horizontal folding surface 641 of the lower oilless bearing 64b interposed at the lower end. The curved surface 641 receives strong frictional resistance, and the slip action is reduced.

[0048] In this state, is gradually rotated at a low speed rotation shaft 61 initially, for the upper and lower oil-less bearing 64a, 64b slip action of which is interposed between the rotary shaft 61 dewatering shaft 65 is generated Prior to this, the spinning shaft 65 is rotated in the same direction as the rotating shaft 61 due to frictional resistance of the laundry placed on the washing / dewatering tub 6 and the stirrer 7 due to gravity.

[0049] Here, the dewatering shaft 65 is rotated is transmitted with a delay the rotation response of the rotary shaft 61, the same to each other by a very only has fine speed difference, inertia after a certain time The rotation shaft 61
The reduction gears, such as the sun gear 73, the planetary gear 71, the internal gear 74, and the drum 76, connected to the upper end of the gears are also rotated in the same direction without any reduction action.

[0050] Therefore, spinning shaft 65, rotary shaft 61, a stirrer 7, when the washing and drying tub 6 is rotated in the same direction and the same speed, it is gradually increasing the speed of the rotation shaft 61,
While the dehydrating shaft 65 is simultaneously rotated at the same speed and in the same direction, the washing / dehydrating tub 6 and the stirrer 7 are simultaneously rotated at a high speed to perform dehydration.

On the other hand, when the pulling force on the brake lever 83 is removed after the spin- drying is completed, the brake band 8
2 is pressed in contact with the outer peripheral surface of the brake drum 80 while being contracted inward by the elastic force of the brake spring 81 to brake the rotation of the brake drum 80. -The rotation of the dewatering tank 6 stops.

Next, it will be explained in detail with reference to FIG. 6 of the accompanying second embodiment of the present invention. Incidentally, the same configuration and the same configuration as those of the first embodiment of the present invention are denoted by the same names and the same reference numerals, and the detailed description thereof will be omitted.

[0053] In the power transmission means 100b of the present invention, the rotation center of the rotor 62b of the motor 62 is first rotary shaft 61a is provided to be press-fitted to be rotated, rotating the first A second rotating shaft 61b is press-fitted to a fixed depth at the upper center of rotation of the shaft 61a so as to rotate by receiving the power of the first rotating shaft 61a. A third rotation shaft 61c is provided at the rotation center of the dewatering tank 6 and the stirrer 7 so that the reduced rotation is transmitted from the second rotation shaft 61b and the third rotation shaft 61c is rotated .

[0054] That is, wherein the outer periphery of the second rotary shaft 61b, and the lower carrier 70a is provided through the lower oil-less bearing 64c, a plurality of planetary gears 71 on the upper portion of the lower carrier 70a is axial 72 and rotatably supported via the second planetary gear 71.
A sun gear 73 fixed to the rotation shaft 61b is provided.

[0055] At this time, the lower oil-less bearing 64c
As shown in FIG. 8, a cylindrical surface 640 is formed between the second rotating shaft 61b and the peripheral surface of the lower carrier 70a. The horizontal curved surface 641 interposed between the lower horizontal portion where the lower carrier 70a and the first rotating shaft 61a are in contact with each other so that the lower carrier 70a and the first rotation shaft 61a are contacted with each other so that the lower carrier 70a is pressurized by the gravity acting on the lower carrier 70a to cause frictional resistance and non-slip. Are formed.

[0056] On the outside of the planetary gear 71, internal gear 7
The upper carrier 75a is supported on the upper end of the shaft 72 so as to be connected to the lower carrier 70a via a plurality of shafts 72. A drum 76a is provided on the outer periphery of the lower end of the rotating shaft 61c.
Are press-fitted.

[0057] On the other hand, on the outer surface center of the bottom surface of the outer tub 2, the upper housing 90 is fixed via a plurality of fastening members 63e, the lower housing 91 is provided on the lower surface of the upper housing 90 The upper surface of the lower housing 91 is connected to the housing 90, and the lower end of the lower housing 91 is connected to the lower carrier 90a.
Is connected to the outer peripheral surface of the ball bearing 68 interposed on the lower outer peripheral surface.

[0058] Further, wherein the outer periphery of the third rotary shaft 61c, washing and is pressed into the center of rotation of the laundry drying tub 6
A dehydrating tub 6 is interlocked, and a dehydrating shaft 65a that is fitted and interlocked with the third rotating shaft 61c via upper and lower oilless bearings 64a and 64b is provided, and a middle height of the dehydrating shaft 65a is provided. A stop ring 92 is fixed to the outer periphery of the third rotating shaft 61c so that the washing / dewatering tub 6 press-fitted and fixed to the outer periphery of the upper end of the dehydrating shaft 65a is positioned at a predetermined height without being lowered. Of the upper end of the shaft and dehydrating shaft 65a
An oil seal 69 is press-fitted between the inner periphery of the upper end and the inner periphery to prevent water leakage.

[0059] with water in the outer tub 2 is sealed so as not to leak between the inner circumference of the rotation center of the outer periphery and the outer tub 2 of the spinning shaft 65a with respect to the lower side of the stop ring 92, the spinning shaft 65a A sealing member 67 for supporting the outer tub 2 so as to be rotated separately is provided, and a brake drum 80a is provided between the outer periphery of the lower end of the dehydrating shaft 65a and the outer periphery of the lower carrier 70a.
A ball bearing 68 is interposed between the outer periphery of the upper end of the brake drum 80a and the inner periphery of the upper end of the upper housing 90 so that the brake drum 80a is rotatably supported.

[0060] At this time, the outer periphery of the brake drum 80a is urged by the force of the spring 81 and surrounds the brake drum 80a and pressure to the brake band 82
Brake levers 83 are provided on both side ends of the brake band 82 so as to separate the brake band 82 from the brake drum 80a when pulled by a driving force of a brake motor (not shown).

Next, it will be described in detail the operation and effects of the second embodiment of the present invention which songs configured. Incidentally, the brake device allows the dehydrating shaft 65a and the washing / dewatering tub 6 to freely rotate at the time of the washing process or at the start of the dehydrating process, similarly to the first embodiment of the present invention, and the dehydrating process is terminated. Since the rotation of the washing / dewatering tub 6 is stopped by braking the dehydrating shaft 65a, the first to third rotations having a configuration different from that of the first embodiment of the present invention will be described below for convenience of description. The shaft 61a,
Only the interlocking relationship between 61b and 61c and the rotation direction of the washing / dewatering tub 6 and the stirrer 7 will be described.

[0062] During the washing process, when the first rotary shaft 61a which is connected thereto as the drive of the motor 62 rotates, the first rotary shaft 61a and the second rotary shaft 61b same direction that is fixed to the upper end and By rotating at the same speed, the second rotating shaft 61b rotates the planetary gear 71 meshed with the sun gear 73 fixed to the outer periphery of the upper end thereof, so that the planetary gear 71 and the second rotating shaft 61b are rotated. While rotating in the opposite direction, it also revolves in the same direction as the second rotation shaft 61b at the same time.

[0063] That is, the lower carrier 70a which is connected with the shaft 72 for supporting the rotation of the planetary gear 71 rotates the brake drum 80a → the spinning shaft 65a → washing and dewatering tank 6 simultaneously in the same direction and the same speed, the 2 times
The internal gear 74 connected to the planetary gear 71 so as to rotate in the same direction as the rotation shaft 61b is connected to the drum 76a → the third gear.
Rotating the stirrer 7 in the same direction and at the same speed at the same time, and rotating the stirrer 7 and the washing / dewatering tub 6 in opposite directions to each other by rotating the stirrer 7 in the same direction and at the same speed as the second rotating shaft 61b. By being rotated, a strong new water flow is generated similarly to the effect of the first embodiment of the present invention, and the washing power can be increased.

[0064] On the other hand, at the time of dehydration step, the first of the present invention
As in the embodiment, since there is no clutch for connecting the washing / dewatering tub 6 and the stirrer 7, the washing / dewatering tub 6 and the stirrer 7 are not provided.
Should be rotated in the same direction.

[0065] That is, when the washing water in the washing and de-tub 6 is drained to the outside before the start of the dehydration step, washing and de-water tank 6
And the load acting on the stirrer 7 remains as wet laundry, and the load (gravity) is transmitted to the dehydrating shaft 65a supporting the washing / dehydrating tub 6.

[0066] In this case, the gravity applied to the spinning shaft 65a, dehydrated axis 65a → brake drum 80a → lower carrier 70
The transmission from a to the oilless bearing 64c imparts a strong frictional resistance to the horizontal bent surface 641 at the lower end of the lower oilless bearing 64c to reduce the slip action.

[0067] In this state, the first and second rotating shafts 6
When 1a and 61b are gradually rotated at a low speed in the initial stage, the first
Before the horizontal bent surface 641 of the lower oilless bearing 64c interposed between the rotary shaft 61a and the lower carrier 70a, the lower oilless bearing 64c is placed on the washing / dewatering tub 6 and the agitator 7 and wetted before slipping. The lower carrier 70a and the first and second rotating shafts 61a and 61b are rotated in the same direction while non-slip is generated due to frictional resistance due to the gravity of the laundry.

[0068] Here, the lower carrier 70a, the first and second rotating shafts 61a, but with a delay from rotation reaction of 61b are rotated is transmitted, is only a very fine speed difference, the predetermined time interval has elapsed Later, since they rotate at the same speed due to the inertial force, the sun gear 73, the planetary gear 71, the internal gear 74 provided between the second rotation shaft 61b and the third rotation shaft 61c, The decelerator such as the drum 76 does not have any deceleration effect, and rotates the stirrer 7 in the same direction via the third rotating shaft 61c while being rotated in the same direction.

[0069] Thus, the first to third rotating shaft 61
After a certain period of time, the a, 61b, 61c and the dehydrating shaft 65a rotate at the same direction and at the same speed while simultaneously rotating the washing / dehydrating tub 6 and the stirrer 7 at high speed to perform dehydration.

Next, it will be explained in detail with reference to FIG. 7 of the accompanying third embodiment of the present invention. Incidentally, the same components as those of the conventional configuration and the first and second embodiments of the present invention are denoted by the same names and the same reference numerals, and the detailed description thereof will be omitted.

[0071] The power transmission unit 100c according to the third embodiment of the invention, the second embodiment drums 76a that was used in power transmission means 100b is removed by, instead the internal gear 74 is the brake drum 80a of the present invention Shaft 7 fixed to the inner peripheral wall of the shaft 7 and supporting the rotation of the planetary gear 71
The upper surface of the concatenated upper carrier 75a into two third rotation
It is fixed to the outer peripheral surface of the lower end of the shaft 61c.

Next, a description will be given of action and effect of the third embodiment of the invention configured song. Incidentally, similarly to the first and second embodiments of the present invention, the brake device allows the dehydrating shaft 65a and the washing / dewatering tub 6 to freely rotate at the time of the washing process or at the start of the dehydrating process, and the dehydrating process is completed. Then, since the rotation of the washing / dehydrating tub 6 is stopped by braking the dehydrating shaft 65a, for the sake of convenience of the description, the first to third configurations different from the first embodiment of the present invention will be described below. Rotation axis 61 of
Only the interlocking relationship between a, 61b and 61c and the rotation direction of the washing / dewatering tub 6 and the stirrer 7 will be described.

[0073] During the washing process, when the motor 62 is driven, first and second rotating shafts 61a, 61b is rotated at the same time, the second rotary shaft 61b sun gear 73 → planet gear 71 → shaft 72 → upper Carrier 75a → third rotating shaft 61
c → The stirrer 7 is rotated in the same direction.

[0074] Incidentally, the internal gear 74 meshed with the planetary gear 71 rotates the brake drum 80a → the spinning shaft 65a → washing and dewatering tank 6 simultaneously in the same direction and the same speed, a second rotating shaft 61b It will rotate in the opposite direction.

[0075] Thus, a stirrer 7 washing and de-water tank 6
Although the rotation direction is changed mutually with the first and second embodiments of the present invention, they are substantially rotated in the opposite directions, and the strong new water flow is generated similarly to the effect of the first embodiment of the present invention. The flow can be generated to increase the washing power.

[0076] dewatering stroke, to become identical to the second embodiment of the present invention, will be omitted in explanation for its action and effect.

[ 0077 ]

As described above, according to the present invention, according to the power transmission device of a washing machine according to the first to third embodiment of the present invention, the rotation
When the shaft is rotated, the rotating shaft and the washing / dewatering tub are rotated in the same direction during the washing process according to the inertia force proportional to the initial rotation speed, while being rotated in the opposite direction to the stirrer. In order to switch between the washing process and the dehydrating process as in the related art, the washing / dehydrating tub and the stirrer are rotated together with the rotating shaft in the same direction during the dehydrating process. This eliminates the clutch and the buoyancy box that have been used, and has the effect of preventing a malfunction during power switching.

[0078] Also, instead of removing the clutch, since the mechanical brake is provided, when it comes to power failure during high-speed and intermittent dehydration step, a brake is actuated by the elastic force of the spring even without power supply The device has the effect that the washing / dehydrating tub can be immediately and rapidly braked.

[0079] Further, washing and drying tub during the washing stroke while being rotated by transmitting directly power from the rotating shaft without passing through the reduction gear in the same direction, be balanced with a stirrer and a force which is rotated in the opposite direction As a result, not only can the flow of the water flow be strengthened, but also the washing power of the laundry can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a conventional washing machine.

FIG. 2 is an enlarged vertical sectional view of a main part showing an operation state during washing of a conventional washing machine.

FIG. 3 is an enlarged longitudinal sectional view of a main part showing an operation state during dehydration of a conventional washing machine.

FIG. 4 is an enlarged exploded perspective view showing a conventional power interrupting means of the washing machine.

FIG. 5 is a longitudinal sectional view showing a clutchless power transmission device of the washing machine according to the first embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a clutchless power transmission device of a washing machine according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a clutchless power transmission device of a washing machine according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing a shape of a lower oilless bearing applied to the first to third embodiments of the present invention.

[Description of Signs] 2 Outer tub 6 Washing / dewatering tub 7 Stirrer 61 Rotary shaft 61a First rotary shaft 61b Second rotary shaft 61c Third rotary shaft 62 Motor 64b Lower oilless bearing 64c Lower oilless Bearing 640 Cylindrical surface 641 Horizontally bent surface 65 Dewatering shaft 65a Dewatering shaft 70 Lower carrier 70a Lower carrier 80 Brake drum 80a Brake drum

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Fri ▲ Ji-Hyun Gyeonggi-do South Korea No. 152, No. 1303, Sumigong Apartment, Reidong-dong, Paldal-gu, Sichuan

Claims (5)

[Claims] In a washing process, the rotation of a motor shaft is reduced by a speed reducing means to rotate a stirrer and a washing / dewatering tub in mutually opposite directions. A power transmission device for a washing machine configured to rotate a water tub in the same direction and at the same speed, wherein the power transmission device is fitted at a predetermined height on an outer periphery of the motor shaft, and is press-fitted and fixed to a rotation center of the washing / dehydrating tub. A dehydrating shaft that is rotated integrally with the washing / dewatering tub; and when the motor shaft is rotated during the washing process, the dehydrating shaft is rotated in the same direction by inertia to interlock the washing / dewatering tub simultaneously. And when the motor shaft and the dehydrating shaft are rotated by different speed differences, the agitator is decelerated to rotate in the opposite direction to the washing / dehydrating tub, Initially, the motor shaft is gradually rotated at a low speed in a state without a clutch, and when the rotation is accelerated, the dehydrating shaft is rotated in the same direction by the inertial force and the washing / dehydrating tub is simultaneously linked, When the motor shaft and the spinning shaft are rotated at the same speed, the motor shaft and the spinning shaft are rotated in the same direction and at the same speed as the washing and spinning tub without decelerating the stirrer. At least one or more oilless bearings interposed between the power transmission device and the power transmission device for a washing machine. 2. A brake means provided on an outer periphery of a lower end of the dehydrating shaft and detached for smooth rotation of the dehydrating shaft during a washing and dehydrating process, and further, a braking means for braking the rotation of the dehydrating shaft when dehydration is stopped and a power failure occurs. The power transmission device for a washing machine according to claim 1, further comprising: 3. The oilless bearing is pressurized by a gravity acting on the dewatering shaft during a dewatering process and a cylindrical surface interposed between the peripheral surfaces of the motor shaft and the dewatering shaft to generate frictional resistance. A horizontal bent surface interposed between a lower horizontal portion where the dehydrating shaft and the motor shaft are in contact with each other so that non-slip occurs.
A power transmission device for a washing machine according to claim 1. 4. The agitator and the washing / dewatering tub are rotated in opposite directions in the outer tub during the washing process, and the agitator and the washing / dehydrating tub are made identical in the outer tub during the dewatering process. A power transmission device for a washing machine configured to rotate in the same direction and at the same speed, wherein a motor provided on a lower outside of the outer tub and a first motor shaft of the motor are always rotated in the same direction. A second motor shaft provided at an upper end of the first motor shaft; and a speed reduction means provided at an upper end of the second motor shaft so as to switch rotation in a direction opposite to the second motor shaft during a washing process. A third motor shaft provided at an upper end of the speed reducer so as to rotate the stirrer while being rotated by being reduced by the speed reducer; and rotated in the same direction and at the same speed as the washing / dehydrating tub. The third mode A dewatering shaft rotatably fitted to the outer periphery of the shaft and press-fitted and fixed to the rotation center of the washing / dewatering tub; a lower carrier of the speed reduction means fitted to the outer periphery of the second motor shaft; A brake drum for connecting the dewatering shaft so as to rotate in the same direction and at the same speed; and when the first and second motor shafts are rotated during the washing process, the washing / dehydrating tub is moved in the same direction by inertia. And rotating the stirrer, which is rotated at a reduced speed by a different speed difference between the first and second motor shafts and the lower carrier, in a direction opposite to the washing / dewatering tub. At first, the first and second motor shafts are gradually rotated at a low speed in the initial state without a clutch, and then the first and second motor shafts are accelerated while being accelerated.
When the motor shaft and the lower carrier are rotated in the same direction and at the same speed, the third motor shaft is not decelerated and the agitator is rotated in the same direction and at the same speed as the washing / dewatering tub. A power transmission device for a washing machine, comprising: at least one or more oilless bearings interposed between the first and second motor shafts and the lower carrier. 5. The oilless bearing has a cylindrical surface interposed between a peripheral surface of the second motor shaft and the lower carrier, and is frictionally pressed by gravity acting on the lower carrier during a dehydration process. The washing machine according to claim 4, further comprising: a horizontal bent surface interposed between a lower horizontal portion where the lower carrier and the first motor shaft are in contact with each other so as to cause resistance and cause non-slip. Power transmission of the machine.