KR20030043413A - Washing machine - Google Patents

Abstract

The present invention relates to a washing machine capable of washing in various ways corresponding to the characteristics of the laundry load by providing a clutch system that can freely adjust the rotation of the pulsator and the inner tank during washing administration in a washing machine employing an induction motor. will be.

To this end, the present invention is coupled to the lower washing shaft (6a) and the pulsator (4) inside the inner tank (3) that is directly coupled or indirectly coupled to the drive shaft of the induction motor (5) based on the reduction gear A washing shaft separated by an upper washing shaft 6b for rotating the pulsator by receiving power from the hollow shaft, and a hollow detachment that is rotatably supported by a bearing on the outside of the washing shaft, and having an upper end coupled to the inner tub to rotate the inner tub. The clutch 7 is provided at the lower end of the contraction 7 and the lower laundry shaft and the dehydration shaft, and restrains or separates the dehydration shaft from the lower laundry shaft while moving up and down. The clutch lever 50 for moving and the sliding member 41 capable of moving forward and backward are connected to the clutch lever and the drain valve to induce horizontal movement of the clutch lever. It provides a washing machine that includes a drain capable motor 40 a two-stage operation to control the opening and closing of the drain valve at the time.

Description

Washing machine

The present invention relates to a washing machine, and more particularly, in a washing machine employing an induction motor, by providing a clutch system that can freely control the rotation of the pulsator and the inner tank during washing, and in various ways corresponding to the characteristics of the washing load. The present invention relates to a washing machine capable of performing washing to improve washing performance.

In general, a washing machine is a product that removes various contaminants attached to clothes, bedding, etc. by using the emulsification of detergent, friction action of water flow caused by rotation of the pulsator, and impact action of the pulsator on laundry. Appearing automatic washing machine automatically performs a series of processes leading to washing, rinsing and dehydration without user intervention in the middle.

Such a washing machine may be roughly classified into a top loading method in which the inner tank is built and a drum type washing machine in which the inner tank is laid, depending on the type of the inner tank in which the laundry is accommodated. Among these, the top-loading washing machine has a method of washing by left and right stirring of the pulsator and a method of washing by centrifugal force generated while the inner tank is rotated. The structure of the electronic pulsator type washing machine will be described next. Same as

As shown in FIG. 1, the pulsator type washing machine is elastically supported by a plurality of suspension devices (not shown) inside the main body 1 and rotates inside the outer tank 2 for storing the washing water. An inner tank 3 capable of accommodating laundry, a pulsator 4 installed at the bottom of the inner tank and generating water flow while stirring from side to side, and provided at one side of the lower end of the outer tank, and the rotational force of the inner tank and the pulsator Induction motor (5) for generating a large, and the clutch system 10 for selectively transmitting the power of the induction motor to the inner tank and the pulsator is large.

At this time, in order to transfer the power of the induction motor 5 to the inner tank 3 and the pulsator 4, the shaft end and the clutch system of the induction motor are provided with pulleys 8a and 8b, respectively, between the pulleys. The V belt 8c is provided. In addition, a washing shaft 6 for transmitting power of the induction motor 5 to the pulsator 4 is provided on the pulley 8b of the clutch system, and the induction motor is a hollow tube surrounding the outer circumference of the washing shaft. The dehydration shaft 7 which transmits the power of (5) to the inner tank 3 is provided.

Hereinafter, the power transmission process of the induction motor with reference to Figure 2 will be described in detail.

As shown in FIG. 2, the washing shaft is connected to the lower washing shaft 6a directly connected to the clutch pulley 8b and the upper washing shaft 6b connected to the pulsator and receiving power of the lower washing shaft through the reducer 14. It is composed of In this case, a plurality of oilless bearings 13 are provided between the washing shaft and the dehydration shaft 7 to rotatably support the washing shaft, and between the dewatering shaft 7 and the bearing housing 11. A ball bearing 12 is provided to rotatably support the dehydration shaft.

At this time, the reducer 14 revolves between the sun gear provided at one end of the lower washing shaft 6a and the sun gear and the inner ring gear, including an inner ring gear formed on the inner wall of the dehydration shaft 7 and an upper washing shaft ( It is composed of a planetary gear connected to the shaft 6b), the rotation speed of the lower washing shaft is properly decelerated and transmitted to the upper washing shaft.

On the other hand, in order to rotate the inner tank 3, the dehydration shaft (7) must be constrained to the wash shaft, which is responsible for this function is the clutch. To this end, a clutch spring 15 capable of selectively tightening the dehydration shaft on the outer circumference of the dewatering shaft 7 located outside the lower washing shaft 6a, and a drain motor (not shown) on one side of the clutch spring. There is provided a clutch lever 16 which can selectively pull one end of the clutch spring while operating by means of.

Referring to the washing and dehydration process of the pulsator type washing machine configured as described above are as follows.

First, when power is applied to the induction motor 5 to rotate during washing, the rotational force generated in the induction motor is transmitted to the lower washing shaft 6a through the motor pulley 8a and the clutch pulley 8b. At this time, since the clutch spring 15 is kept spaced apart from the dehydration shaft 7, the dehydration shaft is separated from the lower washing shaft. Therefore, the rotational force of the lower washing shaft 6a is properly decelerated through the reducer 14 and then transmitted to the upper washing shaft 6b, while the pulsator 4 fixed to the upper washing shaft is stirred left and right. Washing is performed by generating water flow in the inner tank 3.

Next, during dehydration, power is applied to the drain motor to open the drain valve 9a and pull the clutch lever 16, thereby tightening the clutch spring 15 while the dehydration shaft 7 is lowered to the lower washing shaft 6a. Will be clamped strongly. Accordingly, the rotational force of the induction motor 5 is transmitted to the dehydration shaft 7 through the lower washing shaft 6a so that the dehydration shaft also rotates at the same speed as the lower washing shaft. At this time, the rotational force of the lower washing shaft 6a is transmitted to the upper washing shaft 6b without deceleration. Therefore, the pulsator 4 connected to the upper laundry shaft and the inner tank 3 connected to the dehydration shaft rotate at a high speed in one direction to remove the washing water contained in the laundry with strong centrifugal force.

As described above, the pulsator type washing machine performs the washing operation depending on the water flow by the stirring of the pulsator 4. By the way, since the friction action due to the water flow is insignificant, it is extremely inefficient to perform the washing using it. As such, the reason why the conventional pulsator type washing machine can only perform a limited type of washing depending on the stirring of the pulsator is because of the application of the induction motor and the clutch that transmits the power of the induction motor to the washing shaft and the dewatering shaft. Due to the structure. Therefore, the conventional pulsator type washing machine has a problem that can not perform washing in accordance with a variety of laundry load.

In order to solve this problem, a centrifugal washing machine that performs washing while rotating the inner tank has been recently proposed. However, the above-described centrifugal washing machine has a problem that the cost increases due to the application of an expensive DC motor capable of accelerating and decelerating. there was.

The present invention has been made to solve the above problems, an object of the present invention by providing a clutch system that can freely adjust the rotation of the pulsator and the inner tank during the laundry administration in the washing machine employing an induction motor, the characteristics of the laundry load It is to provide a washing machine that can perform the washing in a variety of ways to improve the washing performance.

1 is a cross-sectional view schematically showing the structure of a general pulsator type washing machine

2 is a cross-sectional view showing in detail the drive unit structure of the washing machine according to FIG.

3 is a cross-sectional view schematically showing the structure of a washing machine according to the present invention.

4 is a perspective view showing a coupling of a washing machine according to the present invention;

5 is a perspective view showing the outer bottom structure of the washing machine according to the present invention

6 is an enlarged perspective view of part 'A' of FIG.

7a to 7c are cross-sectional views showing different operating states of the washing machine according to the present invention.

Explanation of symbols on the main parts of the drawings

1 Body 2 Body

3: inner tank 4: pulsator

5: motor 6a: lower washing shaft

6b: upper laundry shaft 7: de-shrink

14: reducer 20: coupling

30: spring 40: drain motor

50: clutch lever 60: lever spring

In order to achieve the above object, the present invention is coupled to the lower washing shaft and the pulsator inside the inner tank directly or indirectly coupled to the drive shaft of the induction motor on the basis of the reducer to receive the pulsator receives power from the lower washing shaft A washing shaft separated by an upper washing shaft to rotate, a hollow dewatering shaft rotatably supported by a bearing outside the washing shaft and having an upper end coupled to the inner tank to rotate the inner tank, and a lower end of the lower washing shaft and the dewatering shaft The clutch is configured to restrain or decouple the dehydration shaft to the lower laundry shaft while moving up and down, and a clutch lever for moving the clutch up and down while horizontal movement is made by retracting and sliding; It is connected to lever and drain valve to induce horizontal movement of clutch lever Provides a washing machine of the two-stage operation to control the opening and closing of the drain valve comprises a drain motor possible.

The washing machine configured as described above performs washing by left and right stirring of the pulsator in a state where power is not applied to the drain motor, and permeation washing and inner tank by one-way rotation of the inner tank in the state where the first stage power is applied to the drain motor. Through washing by the right and left inversion of is selectively performed, dehydration by high-speed rotation of the inner tank is performed in the state that the two-stage power is applied to the drain motor.

Therefore, the present invention, even though the induction motor is applied, by selectively performing the washing by the unidirectional rotation of the pulsator and the washing by one-way rotation or the right and left inversion of the pulsator according to the load of the washing, there is an advantage that can improve the washing performance to provide.

Hereinafter, a washing machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, Figure 3 is a cross-sectional view schematically showing the structure of a washing machine according to the present invention, Figure 4 is a perspective view showing a coupling of the washing machine according to the present invention.

As shown in FIG. 3, the washing machine according to the present invention is elastically supported by a plurality of suspension devices (not shown) inside the main body 1 and rotates inside the outer tank 2 for storing the washing water. An inner tank 3 capable of accommodating laundry, a pulsator 4 installed at a lower end of the inner tank and agitating from side to side to generate water flow, and a driving shaft provided at a central portion of the lower end of the outer tank, It is largely comprised of the connected motor 5. At this time, the motor 5 is an induction motor, but may be indirectly connected to the inner tank 3 and the pulsator 4 by a pulley and a belt, but as an example, the motor is directly connected.

When the connection between the inner tank and the pulsator and the motor is described in detail, the drive shaft is a washing shaft connected to the pulsator 4, and a dehydration shaft 7 connected to the inner tank 3 as a hollow tube concentric with the washing shaft. It is composed of In this case, a plurality of ball bearings 12 are provided between the dewatering shaft 7 and the bearing housing 11 to rotatably support the dewatering shaft, and a plurality of oils between the dewatering shaft 7 and the washing shaft. A lease bearing (not shown) is provided to rotatably support the washing shaft.

The washing shaft is divided into a lower washing shaft 6a directly connected to the induction motor 5 and an upper washing shaft 6b connected to the pulsator 4, and a rotation speed of the motor between the upper washing shaft and the lower washing shaft. It is provided with a reducer 14 to decelerate and deliver to the pulsator. At this time, the speed reducer 14 includes a sun gear 14a formed at one end of the lower washing shaft 6a, an inner ring gear 14c formed on an inner wall of the dewatering shaft 7, and between the sun gear and the inner ring gear. It consists of a plurality of planetary gears 14b revolved in the shaft and connected to the upper washing shaft (6b) to appropriately reduce the rotational speed of the lower washing shaft to transfer to the upper washing shaft.

On the other hand, the washing machine according to the present invention is provided with a clutch for selectively restraining the dehydration shaft (7) to the washing shaft in order to rotate the inner tank (3) itself not only during the dehydration stroke but also during the washing stroke. The clutch is provided at the lower end of the lower washing shaft 6a and the dewatering shaft 7 and selectively restrains the dewatering shaft to the lower washing shaft while moving up and down.

To this end, the clutch is coupled along the outer periphery of the lower washing shaft (6a) and the dewatering shaft (7), the coupling 20 for selectively restraining the dewatering shaft to the lower washing shaft, and one end bearing housing (11) It is composed of a spring (30) which is supported on and pushes the coupling down. At this time, the inner periphery of the coupling 20 and the outer periphery of the dewatering shaft 7 are formed with interlocking serrations, and the lower washing shaft 6a is configured to be coupled to the serration of the coupling. A bushing rotor 6c having serrations formed on an outer circumference is provided separately.

As shown in FIG. 4, the coupling 20 has a hollow portion 21 in which a serration 22 is formed by a predetermined length along a longitudinal direction at an inner circumference thereof, and extends radially from an upper end of the hollow portion. It consists of an extension 23. At this time, a plurality of fixing protrusions 24 coupled to the rear surface of the bearing housing for fixing the inner tank on the extension 23 is formed on the circumference having a predetermined radius.

The hollow part 21 is made of stainless metal having high abrasion resistance because it moves up and down along the lower washing shaft 6a and the dehydrating shaft 7, and the extension part 23 is made of a general resin so that the hollow part can be inserted therein. Made of water

Therefore, when the coupling 20 is raised, the dehydration shaft 7 is separated from the lower washing shaft 6b, and when the coupling is lowered by the restoring force of the spring 30, the dehydration shaft 7 is lowered. It is restrained by the washing shaft 6b. At this time, a member for adjusting the vertical movement of the coupling 20 is required, which will be described in detail with reference to the accompanying drawings.

First, Figure 5 is a perspective view showing the outer structure of the outer tub of the washing machine according to the invention, Figure 6 is an enlarged perspective view of the 'A' part of FIG.

As shown in Figure 5 and 6, the washing machine according to the present invention, in order to induce the vertical movement of the coupling 20, the clutch lever for moving the coupling up and down while the horizontal movement to open and close ( 50 and a drain motor 40 for controlling the opening and closing of the drain valve (not shown) provided on the drain pipe line 9 while inducing horizontal movement of the clutch lever.

The clutch lever 50 has a main clutch lever 51 connected to the drain motor 40 and rotated by a predetermined angle during operation of the drain motor, and a tooth structure engaged with the main clutch lever. The auxiliary clutch lever 53 rotates at the same angle and speed as the main clutch lever. At this time, the main clutch lever 51 and the auxiliary clutch lever 53 has a shape corresponding to each other.

Referring to the shape of the clutch lever, the main clutch lever 51 and the auxiliary clutch lever 53 are circular fixing parts 51a and 53a rotatably supported by fastening bolts on one side of the bearing housing 11, respectively. The upper surface is inclined so as to extend from the fixing part to the outer periphery of the hollow part of the coupling 20 and to be raised by friction while contacting the lower part of the extension part 23 of the coupling when rotating about the fixing part. It consists of the friction parts 51b and 53b. At this time, the fixing portion (51a, 53a) is formed with a plurality of teeth (51d, 53d) to be engaged with each other on the opposite side, respectively, so that when the main clutch lever 51 rotates the auxiliary clutch lever ( 53) rotates in opposite directions at the same angle and speed. This is illustrated well in FIG.

At this time, in the case of the main clutch lever 51, an extension portion 51c extending from the fixing portion 51a is further formed to rotate when the drain motor 40 operates. The extension part 51c is coupled to the sliding member 41 of the drain motor, and at the same time, the lever spring 60 for returning the main clutch lever 51 to its original position when the drain motor is OFF is coupled. That is, the lever spring 60 has one end coupled to one side of the outer tub 2 to apply a force to pull the main clutch lever 51 to the right in the drawing, in which case the friction portion 51b of the main clutch lever and the auxiliary clutch lever. , 53b) lifts the coupling 20 while retracting.

On the other hand, the drain motor 40 is provided on one side of the lower end of the outer tub (2), and the sliding member 41 to move forward and backward is coupled to the drain valve while being coupled to the extension portion (51c) of the main clutch lever. At this time, when the sliding member 41 moves backward, that is, when moving toward the body side of the drain motor, the extension part 51c of the main clutch lever is rotated to the left in the drawing, and opens to the drain valve according to the degree of reverse. When the extension part 51c of the main clutch lever rotates to the left side, the friction portions 51b and 53b of the main clutch lever and the auxiliary clutch lever are opened, and the coupling 20 is lowered by the spring and the own weight.

At this time, the drain motor 40 has a first stage operation for rotating the main clutch lever 51 so that the coupling 20 can be lowered by its own weight and a spring, and the main clutch lever 51 in the first stage operation state. It is operated by two stage operation which rotates) and opens drain valve at the same time.

Therefore, the washing machine according to the present invention is a state in which the drain valve is locked even when the drain motor 40 is driven in the first stage, although the dehydration shaft is constrained to the lower washing shaft to rotate the inner tank. Washing can be performed sufficiently.

Hereinafter, various washing forms of the washing machine according to the present invention will be described in detail.

First, Figures 7a to 7c is a cross-sectional view showing different operating states of the washing machine according to the present invention, Figure 7a shows the washing form by left and right stirring of the pulsator and Figure 7b is washing by left and right stirring of the inner tank Figure 7c shows the shape, Figure 7c shows the washing form by one-way rotation of the inner tank.

As shown in Figure 7a, the washing machine according to the present invention is performed washing operation by the left and right stirring of the pulsator 4 in the state that power is not applied to the drain motor. In detail, as the power is not applied to the drain motor, the main clutch lever is pulled by the lever spring, and the friction portion of the main clutch lever and the auxiliary clutch lever is retracted. At this time, the inclined upper surface of the friction part is to raise the coupling while pressing the lower portion of the extension of the coupling 20, so that the dehydration shaft (7) is separated from the lower washing shaft (6a), the coupling extension A plurality of fixing protrusions 24 formed on the upper surface of the part 23 and the protrusions formed on the rear surface of the bearing housing 11 are combined to fix the inner tank. Due to this, the rotational force of the induction motor 5 is transmitted only to the lower washing shaft 6a, and then is properly decelerated through the reducer 14 and then to the upper washing shaft 6b. Accordingly, water flow is generated in the inner tank 3 while the pulsator 4 connected to the upper laundry shaft is stirred left and right, and contaminants of the laundry are removed by the friction action of the water flow. Washing by stirring the pulsator is a very effective form of washing when there is a lot of laundry and when the laundry is steamed.

Next, as shown in Figure 7b, the washing machine according to the present invention is performed washing operation by the left and right stirring of the inner tank in the state in which the first stage power is applied to the drain motor. In detail, when the first stage power is applied to the drain motor, the main clutch lever is pulled by the sliding member and the friction portion of the main clutch lever and the auxiliary clutch lever is opened. At this time, even when power is applied to the drain motor, the drain valve is locked because the sliding member does not retreat to open the drain valve.

Subsequently, as the friction portion is spaced apart from the extension of the coupling 20, the coupling is lowered by its own weight and by the restoring force of the spring 30, so that the dehydration shaft 7 is a bushing rotor ( Bound to 6c). Due to this, the rotational force of the induction motor 5 is simultaneously transmitted to the lower washing shaft 6a and the dewatering shaft 7, and the rotational force of the lower washing shaft is transmitted to the upper washing shaft 6b without deceleration. Accordingly, water flow is generated in the inner tank while the inner tank 3 connected to the dehydration shaft and the pulsator 4 connected to the upper laundry shaft are stirred at the same speed. The washing by stirring of the inner tank is an effective washing form in the case of laundry which is easily damaged by the stirring action of the pulsator and the inner tank.

Next, as shown in Figure 7c, the washing machine according to the present invention is performed washing operation by one-way rotation of the inner tank in the state that the first stage power is applied to the drain motor. The state at this time is the same as that of FIG. 8B. That is, as the first stage power is applied to the drain motor, the friction portion of the main clutch lever and the auxiliary clutch lever opens, and the coupling 20 descends to restrain the dehydration shaft 7 to the lower washing shaft 6a. Thereafter, when the induction motor 5 rotates at a high speed in one direction, the rotational force of the induction motor is simultaneously transmitted to the lower washing shaft 6a and the dewatering shaft 7, and the rotational force of the lower washing shaft is transferred to the upper washing shaft 6b. The inner tank 3 and the pulsator 4 are rotated at a high speed in the same speed and direction without deceleration. For this reason, the wash water in the inner tank 3 moves to the outer tank 2 by centrifugal force, and ascends along the space between the inner tank and the outer tank, and is introduced into the inner tank again under the guidance of the outer tank cover 2a. . The washing water thus injected penetrates the laundry and more strongly removes various contaminants.

Washing form as described above may be performed in various combinations depending on the load and the degree of contamination.

Thereafter, after the washing operation is completed, the second stage power is applied to the drain motor. In detail, as the two-stage power is applied to the drain motor, the sliding member is further retracted to open the drain valve at the same time as the friction portion between the main clutch lever and the auxiliary clutch lever is further opened. At this time, the coupling is no longer lowered by the end formed in the lower portion of the bushing rotor, this state is the same as the state of Fig. 7b or 7c.

After that, when the induction motor is rotated at a speed necessary for dehydration, the rotational force of the induction motor is transmitted to the upper washing shaft without deceleration and is transmitted to the dehydration shaft to rotate the inner tank and the pulsator at the same speed and direction at high speed. do. Therefore, the wash water contained in the laundry is moved to the outer tank by centrifugal force, and finally discharged to the outside along the drain pipe through the open drain valve.

On the other hand, the features of the present invention as described above can be equally applied to the manner in which the power of the induction motor is transmitted to the washing shaft by the pulley and the belt.

So far, the present invention has been described with reference to preferred embodiments thereof, and one of ordinary skill in the art to which the present invention pertains may implement the modified embodiment within the essential technical scope of the present invention. Here, the essential technical scope of the present invention is shown in the claims, and the modified forms within the equivalent range will be construed as being included in the present invention.

The washing machine according to the present invention provides the following effects.

First, according to the present invention by providing a clutch system that can freely adjust the rotation of the pulsator and the inner tank during the washing administration, even if the induction motor is applied to various types of pulsator washing, tub washing, permeation washing, etc. Since washing can be performed, washing performance can be improved.

Secondly, according to the present invention, the motor load can be reduced by implementing the optimal washing mode according to the laundry load, thereby maximizing energy efficiency.

Claims (9)

Washing divided into a lower washing shaft that is directly or indirectly coupled to the drive shaft of the induction motor based on the reduction gear, and an upper washing shaft which is coupled to the pulsator inside the inner tank and receives power from the lower washing shaft to rotate the pulsator. shaft; A hollow dewatering shaft rotatably supported by a bearing outside the washing shaft and having an upper end coupled to the inner tank to rotate the inner tank; A clutch provided at a lower end of the lower laundry shaft and the dehydration shaft and restraining or separating the dehydration shaft from the lower laundry shaft while moving up and down; A clutch lever which moves the clutch up and down while performing horizontal movements that are lifted and closed; A washing machine comprising a drain motor capable of forward and backward sliding members connected to the clutch lever and the drain valve to induce horizontal movement of the clutch lever and simultaneously controlling opening and closing of the drain valve. The method of claim 1, The clutch comprises a coupling for selectively restraining the dehydration shaft to the lower washing shaft while lifting up and down along the outer periphery of the lower washing shaft and the dehydrating shaft, and one end supported by a bearing housing to push the coupling down. The washing machine characterized by. The method of claim 2, The coupling may include a hollow portion having a serration formed at an inner circumference of the lower washing shaft and a dehydration shaft, an extension portion extending radially from an upper end of the hollow portion to be in contact with a clutch lever, and on the extension portion. Washing machine, characterized in that a plurality of fixing projections are formed on the back of the bearing housing for fixing the inner tank when the clutch is raised. The method of claim 3, wherein The coupling is a washing machine, characterized in that the hollow portion made of stainless metal is inserted into the extension portion injected into the water. The method of claim 1, The clutch lever has a main clutch lever which is connected to the drain motor and rotates by a predetermined angle when the drain motor is operated, and a tooth structure that engages with the main clutch lever, so that the clutch lever has the same angle and speed as the main clutch lever when the drain motor is operated. Washing machine, characterized in that consisting of a rotating auxiliary clutch lever. The method of claim 5, The main clutch lever and the auxiliary clutch lever are rotatably supported on one side of the bearing housing, respectively, and have a fixed portion having a plurality of teeth engaged with each other on opposite sides thereof, and extend from the fixed portion to the outer circumference of the clutch. Washing machine, characterized in that consisting of a friction portion for raising the clutch. The method of claim 6, The main clutch lever further extends from the fixed portion and coupled to the sliding member of the drain motor, and at the same time, the washing machine further comprises an extension coupled to the lever spring for returning to the original position when the drain motor OFF (OFF). The method of claim 7, wherein The drain motor includes a first stage operation for rotating the main clutch lever so that the clutch can be lowered by its own weight and a spring, and a second stage operation for further rotating the main clutch lever in the first stage operation state and simultaneously opening the drain valve. Washing machine, characterized in that operated. The method of claim 8, Washing is performed by right and left inversion of the pulsator in a state in which power is not applied to the drain motor, and permeation washing by one-way rotation of the inner tank and inversion of left and right in the inner bath in a state where the first stage power is applied to the drain motor. Washing is selectively carried out, washing machine characterized in that the dehydration by high-speed rotation of the inner tank is performed in the state that the two-stage power is applied to the drain motor.