KR20050121010A - Tilted drum-type washing machine with pulsator and method for controlling the same - Google Patents

Abstract

The present invention is to provide an inclined drum washing machine having a pulsator to increase the washing effect, while reducing the water consumption during washing, while allowing the user to conveniently put and enter the laundry.

To this end, the present invention is a plastic tub having a wall portion for storing the wash water and fastening the drive unit and the front side is inclined upward by a predetermined angle with respect to the ground; A drum rotatably installed inside the tub; A hollow drum shaft which penetrates the tub and is axially coupled to the drum inside the tub to transfer the driving force of the motor to the drum; At least one bearing supporting the hollow drum shaft; A bearing housing of a sleeve type for supporting the bearing; A stator fastened to the rear wall of the tub; A rotor coupled to the rear end of the drum shaft and constituting a BLDC motor together with a stator; A pulsator rotatably installed inside the drum; A pulsator shaft having a front end coupled to the pulsator, a rear end coupled to the pulley, and a serration formed at both ends for engagement with the pulsator and the pulley, the pulsator shaft being installed to penetrate the hollow of the drum shaft; A pulsator rotation control pulley positioned behind the rotor and coupled to a rear end of the pulsator shaft; And a restraining device for controlling the rotation of the pulsator in the drum through restraining and releasing the pulley.

Description

Tilt drum-type washing machine with pulsator and method for controlling the same}

The present invention relates to a drum washing machine, and more particularly, to provide a drum washing machine having a new structure to improve the washing performance while improving the structure of the drum washing machine to facilitate taking in and out of laundry. will be.

In general, a washing machine is a household electric appliance that removes dirty or dirty substances from laundry by mechanical impacts such as chemical decomposition of the detergent and water flow.

Among them, the drum washing machine can not only reduce the overall height, but also increase the washing capacity compared to the same size, and reduce the amount of washing water. There is little problem of, so the demand is increasing.

Hereinafter, the structure of a general drum washing machine will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing the structure of a general drum washing machine, a drum washing machine having a tub (2) supported by a damper and a spring in the cabinet (1), and a cylindrical drum (3) rotatably installed in the tub (2). And a drive unit axially connected to the drum 3.

The drive unit is composed of a rotor 4 and a stator 5 at the rear of the tub 2, and rotates together with the drum 3 to transfer the driving force of the rotor directly to the drum 3 without a pulley or a belt. The rotor shaft 6 is directly connected to the rotor 4.

The front surface of the cabinet 1 is provided with a door 10 at a predetermined position so as to correspond to the opening of the drum 3, and a gasket for maintaining a seal in the drum 3 between the door 10 and the drum 3; 20 is provided.

When power is applied, the drum washing machine configured as described above rotates the rotor 4 by electromagnetic interaction with the stator 5, and the rotational force of the rotor 4 is applied to the drum 3 through the rotor shaft 6. Delivered.

At this time, while the drum 3 rotates, the laundry is lifted by the lift 3a, and the washing stroke is performed by the impact action falling down by gravity.

However, in the conventional drum 3 washing machine constructed as described above, since the door 10 is located near the front center of the cabinet 1 and the drum 3 is horizontally installed, the laundry is introduced into the drum 3 or the drum is loaded. When it is to be withdrawn from (3), there is a problem that the user is inconvenient due to the hand squatting or extending the hand inside the drum (3) in a state bent back.

In addition, conventionally, there is a problem that it is difficult to expect excellent washing performance because the washing stroke is performed only by the structure in which the drum is rotated.

In other words, the conventional drum washing machine has a limit in increasing the washing performance because the washing is performed only by a simple method of lifting and dropping the laundry.

The present invention has been made to solve the above-described conventional problems, while allowing the user to conveniently put and take out the laundry, while reducing the water consumption during washing, so that the washing performance and effect can be further improved. The purpose is to provide a new type of warp drum washing machine.

In order to achieve the above object, the present invention is a plastic tub having a wall portion for storing the wash water and fastening the drive unit is installed inclined upward at a predetermined angle with respect to the ground; A drum rotatably installed inside the tub; A hollow drum shaft which penetrates the tub and is axially coupled to the drum inside the tub to transfer the driving force of the motor to the drum; At least one bearing supporting the hollow drum shaft; A bearing housing of a sleeve type for supporting the bearing; A stator fastened to the rear wall of the tub; A rotor coupled to the rear end of the drum shaft and constituting a BLDC motor together with a stator; A pulsator rotatably installed inside the drum; A pulsator shaft having a front end coupled to the pulsator, a rear end coupled to the pulley, and a serration formed at both ends for engagement with the pulsator and the pulley, the pulsator shaft being installed to penetrate the hollow of the drum shaft; A pulsator rotation control pulley positioned behind the rotor and coupled to a rear end of the pulsator shaft; And a restraining device for controlling the rotation of the pulsator in the drum through restraining and releasing the pulley.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 2 to 7.

First, Figure 2 is a longitudinal sectional view schematically showing the structure of a drum washing machine according to the present invention, Figure 3a is an enlarged portion A of Figure 2, a sectional view of the main part showing a state in which the pulsator is fixed, Figure 3b An enlarged section A of part 2 is a main sectional view showing a state in which the pulsator is rotatable.

4 is a perspective view illustrating the pulsator of the present invention, FIG. 5 is a perspective view illustrating the pulley of the present invention, FIG. 6 is a rear perspective view of FIG. 5, and FIG. 7 is a rotor bushing of FIGS. 3A and 3B. Perspective view.

2 to 7, the drum washing machine according to the present invention has a wall for storing the washing water and fastening the driving part, and has a front tub 2 made of a plastic material inclined upwardly by a predetermined angle with respect to the ground. ; A drum (3) rotatably installed inside the tub (2); A hollow drum shaft (6) axially coupled to the drum (3) inside the tub (2) to transmit the driving force of the motor to the drum through the tub (2); Bearings 113a and 113b for supporting the hollow drum shaft 6; A bearing housing 113 having a sleeve shape for supporting the bearings 113a and 113b; A stator 5 fastened to the rear wall of the tub 2; A rotor (4) coupled to the rear end of the drum shaft (6) and constituting a BLDC motor together with the stator (5); A pulsator 7 rotatably installed inside the drum 3; A pulsator shaft (8) coupled to the front end portion of the pulsator (7) and installed to penetrate the hollow portion of the drum shaft (6); A pulsator rotation control pulley (15) positioned behind the rotor (4) and coupled to the rear end of the pulsator shaft (8); And a restraining device 11 for controlling rotation of the pulsator 7 inside the drum 3 through restraining and releasing the pulley 15.

At this time, the bearing housing 113 in which the rear bearings 113a and 113b are press-fitted to support the drum shaft 6 installed at the rear side of the drum 3 at the rear center of the tub 2. This insert is molded into one piece.

The stator 5 is fastened and fixed to a rear wall of the tub 2 by a fastening member such as a bolt.

On the other hand, the pulsator shaft 8 is supported by oilless bearings 800a and 800b which are installed before and after the shaft, respectively.

In addition, the bearings 113a and 113b for supporting the hollow drum shaft 6 are preferably installed one at each of the front and rear sides for stable support of the shaft, but the number is not limited thereto.

At this time, it is advantageous for the bearings 113a and 113b installed at the front and rear sides of the drum shaft 6 to be installed as far as possible from each other for stable support of the shaft.

In addition, among the bearings 113a and 113b supporting the hollow drum shaft 6, the front bearing 113a of the drum shaft 6 minimizes vibration of the drum 3 when dewatering and increases strength. To this end, it is advantageous to install a bearing having a larger diameter than the rear bearing 113b.

In addition, a water seal 12 for preventing leakage is installed in front of the front bearing 113a of the drum shaft 6, and the water seal 12 is formed on the outer circumferential surface of the drum shaft 6 in the water seal 12. The spring to squeeze is built.

In addition, the outer portion of the water seal 12 is supported by the bearing housing 113, or as shown in the tub rear wall portion as shown in FIG.

The restraint device 11 is composed of a solenoid 11a fixed to the tub 2, and a plunger 11b which is moved back and forth inside the solenoid 11a, thereby electrically turning on / off the solenoid 11a. By the off, the plunger 11b can restrain or release the pulley 15 to control the rotation or fixation of the pulsator 7.

At this time, it is preferable that an elastic member such as a compression spring 11c is embedded in the solenoid 11a.

This is because the position of the fixing groove 150a of the pulley 15 does not coincide with the position of the plunger 11b when the plunger 11b is advanced for fixing the pulsator 7 so that the pulley 15 is out of the fixing groove 150a. Even if it is located, the plunger 11b is elastically contacted with the circumferential surface of the fixing groove 150a of the pulley 15 and is connected to the pulsator 7 by the interference of the laundry according to the rotation of the drum 3 ( When 15) is rotated, it is to automatically find the position of the fixing groove (150a).

Unlike the example in which the solenoid 11a is fixed to the tub 2 as described above, the solenoid 11a constituting the restraining device may be installed to be fixed to a place other than the tub 2, and the solenoid 11a is fixed. It is fixed to the cabinet (1) side surrounding the tub (2), a compression spring (11c) and a plunger (11b) is installed inside the solenoid (11a), by the electrical on / off of the solenoid (11a) plunger It goes without saying that the rotation or fixing of the pulsator 7 can be controlled by constraining or releasing the pulley 15 while the 11b moves forward and backward.

Meanwhile, a resin bushing 13 is interposed between the drum shaft 6 and the rotor 4, and the rotor bushing 13 is located behind the rotor frame 4a and the drum shaft 6 and the rotor. It may be coupled to the frame 4a, or may be coupled to the drum shaft 6 and the rotor frame 4a in a state located in front of the rotor frame 4a.

The rotor bushing 13 is formed to extend radially around the fitting portion 13a to be engaged with the fitting portion 13a to which the drum shaft 6 is fitted and engaged with the rotor frame 4a. It is configured to include a fastening portion 13b.

In addition, the coupling portion 13b of the rotor bushing 13 is integrally protruded toward the rotor frame 4a to form a coupling protrusion 130b for fastening, or for fastening for bolting to the rotor frame 4a. Preferably, a plurality of through holes 131b are provided.

In addition, it is preferable that at least one of the engaging portion 13a and the fastening portion 13b of the rotor bushing 13 is further provided with a reinforcing rib 13c for strength reinforcement.

In addition, a serration for mutual engagement is formed on the outer circumferential surface of the rear end of the drum shaft 6 and the center inner circumferential surface of the fitting portion 13a of the rotor bushing 13 corresponding thereto.

On the other hand, the outside of the rear wall surface of the drum 3 is coupled to the spider 16 for reinforcing strength while supporting the drum rear wall surface 300, the front end of the drum shaft 6 is in close contact with the spider 16 A flange 600 is formed, and the drum rear wall surface 300, the spider 16, and the flange 600 of the drum shaft 6 are fastened together by a fastening member 17 passing therethrough.

In addition, serrations are formed at both ends of the pulsator shaft 8 for engagement with the pulsator 7 and the pulley 15, and the serration forms an involute profile surface to improve strength. It is desirable to have.

On the other hand, the pulley 15, the rear wall portion 15a surrounding the rear wall surface of the rotor frame 4a, the side wall portion 15b surrounding the side wall surface of the steel rotor frame 4a produced by pressing processing, The engaging portion 15c with the pulsator shaft 8 provided at the central portion of the rear wall surface of the rotor frame 4a and the rotor frame 4a of the pulley 15 for restraint by the restraint device 11. It is configured to include a fixing groove (150a) formed in a portion surrounding the.

Here, the engaging portion 15c of the pulley 15 is formed to protrude in a boss shape and is located inside the rear end of the drum shaft 6 when assembling the pulley 15 in the assembly line.

And, the drum shaft 6 is made of a SM45 series material, or stainless steel material,

When the material of the drum shaft 6 is SM45 series, the surface of the drum shaft 6 is chromium plated to reduce wear and friction of the drum shaft 6 and to increase corrosion resistance. At this time, the entire surface of the drum shaft 6 may be chrome plated, but instead of chrome plating the entire surface, only a part of the surface of the drum shaft 6 is chrome plated. You may. In this case, the chromium plating treatment must be performed on at least the sliding surface of the drum shaft 6 with the water seal 12 or the like.

On the other hand, in order to reduce wear / friction of the sliding surfaces of the water seal 12 and the drum shaft 6 and to ensure corrosion resistance, the material of the drum shaft 6 may be made of stainless steel, even though it may cost more. .

And, on the surface of the pulsator (7), when the laundry pulled up by the rotation of the drum (3), the falling laundry hits the washing blade (7a) to increase the friction force and the laundry drum ( 3) a washing blade 7a is further provided to move in the front and rear direction.

Here, the main surface (ie, the surface) of the pulsator 7 and the washing blades 7a provided to be spaced apart from each other by a predetermined interval are preferably formed integrally, but not necessarily.

On the other hand, the washing blade (7a) has at least one inclined surface with respect to the radial or circumferential direction of the pulsator (7).

The main surface of the pulsator 7 is formed to have a predetermined curvature, and the pulsator outer diameter is formed to have a size corresponding to 50 to 80% of the inner diameter of the drum 3.

And, the maximum height of the washing wing (7a) of the pulsator 7 is formed to correspond to 5 to 15% of the outer diameter of the pulsator.

In addition, the drum 3 and the tub 2 are preferably installed such that their central axis is inclined by 10 to 30 degrees with respect to the ground.

This is to add and take out the laundry, and to increase the washing effect and to prevent excessive vibration during dehydration.

If the inclination angle is more than 30 degrees, the drum 3 is rotated in a state inclined at a large angle, during washing, the laundry is leaned to the rear of the drum 3, the laundry is tangled, the laundry power is reduced In addition, there is a problem that excessive vibration occurs during dehydration.

Therefore, in consideration of this, it is preferable that the inclination of the tub 2 is inclined to 30 degrees or less.

On the other hand, a plurality of lifts (3a) is installed on the inner circumferential surface of the drum (3) to lift the laundry up during washing, the interval of about 30 to 90mm between the lift (3a) and the pulsator (7) blade ( D) is formed.

This is to prevent the laundry from being caught between the lift 3a and the pulsator 7 and the rotation of the pulsator 7 and the drum 3 is restricted.

On the other hand, before and after the drum 3, it is preferable that the auto balancer 9 filled with a fluid such as water or salt water is mounted inside to reduce vibrations during dehydration.

At this time, the auto balancer 9 may have a single fluid chamber structure, but more advantageously, it forms a concentric circle but forms a double, triple or quadruple fluid chamber structure, and the inner fluid chamber and the outer fluid chamber are separated from each other. To prevent the fluid from falling over.

In addition, it is more advantageous for the auto balancer 9 to reduce the vibration of the drum 3 to make the height H higher than the width W.

On the other hand, in addition to the above-described configuration, a hanging spring (2a) (Hanging spring) through which the tub 2 is suspended may be installed between the upper surface of the inside of the cabinet (1) and the upper surface of the tub (2), the tub (2) Of course, a damper may be provided between the lower side of the outer circumferential surface and the lower surface of the cabinet 1 to damp the vibration of the tub 2 generated during dehydration.

The operation of the drum washing machine of the present invention configured as described above is as follows.

First, since the drum washing machine of the present invention is installed such that the front side of the drum 3 and the tub 2 is inclined at an angle of 10 to 30 degrees with respect to the ground, the laundry and the laundry are conveniently put in and taken out.

That is, when the laundry is to be put into the drum (3) or withdrawal from the drum (3), the user has to reach out into the drum (3) in the squat or bent state, because the inconvenience caused by the conventional In contrast, due to the tub 2 and the drum 3 installed inclined, the convenience of handling the laundry at the time of loading and withdrawing the laundry is provided to the user.

In addition to such convenience, the drum washing machine of the present invention improves washing performance by installing a pulsator 7 inside the drum 3.

That is, in the related art, since only the drum is rotated, washing is performed only by the method in which the lift 3a lifts and drops the laundry, thereby limiting the washing performance. However, the drum washing machine of the present invention has a tub 2 and a drum ( In addition to the inclined state of 3), the pulsator 7 is installed in the drum 3, thereby increasing the action of the lift 3a and the impact between the pulsator 7 and the laundry during washing. The inclination and the shape of the pulsator 7 make the front and rear flow of the laundry more active, and the washing performance is remarkably improved.

More specifically, the tub 2 and the drum 3 are installed inclined, and the tub (with the pulsator shaft 8 connected through the hollow drum shaft 6 to the pulley 15 behind the motor) 2) The plunger 11b is a disk-shaped pulley by the action of the solenoid 11a and the compression spring 11c constituting the restraint device 11 by controlling the power applied to the restraint device 11 fixed to the rear wall. The pulley 15 is restrained or released by maintaining the state entered into the fixing groove 150a or exiting from the fixing groove 150a. And, this means the state to restrain or freely release the rotation of the pulsator (7).

As such, the pulsator 7 is fixed or rotated when washing, thereby improving the washing performance by diversifying the flow state of the laundry in the drum 3.

On the other hand, even during dehydration, the plunger 11b enters the fixing groove 150a of the pulley 15 to control the pulsator 7 to be fixed, or the plunger 11b exits the fixing groove 150a of the pulley 15. The pulsator 7 can be controlled to be rotatable.

And, if the solenoid (11a) is turned on during dehydration and the plunger (11b) comes out of the fixing groove (150a) of the pulley 15, the pulsator (7) at high speed rotation of the drum (3) can also be rotated together with high speed. However, the high speed rotation of the pulsator 7 is not a forced rotation by a direct driving force like the drum. That is, the pulsator 7 does not rotate in synchronism with the motor speed, and since the laundry in the drum 3 is placed on the pulsator 7, the rotational force of the drum is rotated through the laundry when the drum 3 is rotated. Transfer to (7) only causes the pulsator (7) to rotate at high speed at approximately the same speed as the drum (3).

On the other hand, in addition to improving the washing performance described above, the drum washing machine of the present invention is an auto balancer (9) for maintaining the balance of the drum by the fluid inside the front and rear of the drum (3) separately from the balancer weight mounted on the tub (2). By placing), it is possible to more effectively reduce the system vibration due to the eccentric load inside the drum (3) during dehydration.

In particular, in the drum washing machine of the present invention, the tub 2 and the drum 3 are inclined so that the vibration of the rear side is larger than that of the conventional one, due to the attachment of the auto balancer 9 inside the rear of the drum 3. It can effectively reduce the vibration of the back.

And, as described above, when the tub 2 is installed in an inclined state, the drum 3 installed inside the tub 2 is also installed in an inclined state, which causes the inside of the drum 3. Washing can be performed using less wash water.

For example, since the drum washing machine of the present invention is in a state where the drum 3 is inclined, a part of the laundry is directed to the rear side of the inclined drum 3, and the laundry gathered at the rear side of the inclined drum 3. You only need to fill the wash water to perform this washing.

On the other hand, the drum washing machine of the present invention, by assembling the engaging portion (15c) of the pulley (15) during assembly of the pulley (15), it is possible to achieve the effect of reducing the overall length of the drum washing machine.

That is, if the inclined portion 15c of the pulley 15 is not accommodated in the drum shaft 6 in the inclined state, there is a disadvantage in that the overall length becomes longer and the capacity of the drum washing machine is further reduced, but the drum washing machine of the present invention is pulley. By accommodating the fitting portion 15c of the (15) in the drum shaft 6 is to reduce the overall length is to increase the washing capacity relatively.

On the other hand, in the following, when the washing stroke performed by the drum washing machine of the present invention as described above, it will be described for the pulley 15 control process and its operation.

First, a process of performing the washing process by rotating the drum 3 in a state where the pulsator 7 is fixed will be described with reference to FIG. 3A.

As shown in FIG. 3A, when the plunger 11b is advanced and positioned in the fixing groove 150a of the pulley 15, the pulley 15 may not rotate, and thus the pulsator 7 may not rotate. It is fixed in the drum 3.

In this state, when a power source for the washing stroke is applied, the rotor 4 rotates by electromagnetic interaction with the stator 5, and the drum 3 axially connected to the rotor 4 rotates.

Here, the drum 3 may rotate left and right by a predetermined period in response to a signal of a microcomputer (not shown), and the pulsator 7 may be stopped.

Accordingly, the laundry is lifted by the plurality of lifts 3a provided in the drum 3 and then the washing is performed while falling down by gravity, since the drum 3 is in an inclined state. When the laundry falls, the pulsator 7 and the washing wings 7a are moved forward.

In particular, the drum washing machine according to the present invention has a greater number of front and rear flows of the laundry falling after being lifted by the lift 3a due to the protruding centers of the washing wings 7a and the pulsator 7. That is, the bent surface of the washing blade (7a) and the curvature of the main surface of the pulsator (7) and the installation inclination angle will cause the position of the laundry to change.

In addition, since the drum 3 rotates in an inclined state and the pulsator 7 is in a fixed state, a speed difference between the rotating drum 3 and the fixed pulsator 7 varies. This results in irregular and various forms of laundry flow and wash streams.

At this time, the washing water flows to distribute the laundry collected to the rear side of the drum 3 back to the respective parts in the drum to help the laundry to be evenly washed.

That is, during washing, the washing and rinsing power of the laundry are greatly improved by the water flow due to the collision between the wash water and the pulsator 7 and the impact action due to the collision between the laundry and the pulsator 7.

Hereinafter, unlike the above, the washing process in the state in which the restraint on the pulley 15 is released and the pulsator 7 is rotatable will be described with reference to FIG. 3B.

As shown in FIG. 3B, when power is applied to the solenoid 11a and the plunger 11b is attracted, the plunger 11b is retracted while compressing the compression spring 11c to be out of the fixing groove 150a of the pulley 15. Thus, the pulley 15 is able to rotate, and the pulsator 7 is also in a rotatable state.

In this state, when a power source for the washing stroke is applied, the rotor 4 rotates by electromagnetic interaction with the stator 5, and the drum 3 axially connected to the rotor 4 rotates.

In this case, the drum 3 may be rotated left and right by a predetermined period in response to a signal of a microcomputer (not shown), as described above, and the pulsator 7 rotates the drum when the drum 3 is rotated. It rotates to the left or right under the interference of laundry and washing water flowing inside.

Accordingly, the laundry is lifted by the plurality of lifts 3a provided in the drum 3 and then the washing is performed while falling down by gravity, since the drum 3 is in an inclined state. A part of the laundry hits the pulsator 7 which rotates upon falling.

Then, the laundry hit the pulsator 7 is moved forward.

That is, in this case as well, the drum washing machine of the present invention causes a change in the position of the laundry due to the bent surface of the washing wing 7a and the main surface curvature and the inclination angle of the pulsator 7, thereby washing the laundry. After being pulled up by (3a), there will be more back and forth flow than before.

In addition, since the pulsator 7 is also rotatable but does not rotate at a predetermined speed like the drum 3, a speed difference exists between the rotating drum 3 and the pulsator 7. In this case, irregular and various types of laundry flow and laundry flow are formed at this time.

That is, although the relative speed difference is smaller than the state in which the pulsator 7 is fixed, there is a relative speed difference between the drum 3 and the pulsator 7 to assist the flow of the laundry. Contributes to improved rinsing power.

In short, in the drum washing machine according to the present invention, washing is performed by using a relatively large speed difference in a state in which the pulsator 7 is fixed, or in a state in which the pulsator 7 can be freely rotated. Washing can be performed using a small speed difference.

In addition, the washing may be performed by controlling the forward / reverse rotation time of the drum 3 to a short time in which the laundry does not fall while the pulsator 7 is fixed or released during washing.

On the other hand, the present invention is not limited to the above embodiments, and various changes and modifications can be made to various forms without departing from the scope of the technical spirit of the present invention.

For example, a small pulsator rotatable on the inner circumferential surface of the drum 3 may be further incorporated.

As described above, the drum washing machine of the present invention can be inclined to the tub, so that laundry can be easily added or removed, and water consumption can be reduced during washing, thereby improving the reliability of the product to the user. There is.

In particular, the drum is rotated in an inclined state and the pulsator is provided inside the drum, thereby improving the washing performance by varying the flow form and flow of the laundry in the drum.

In other words, the drum washing machine of the present invention causes the change of the position of the laundry by the inclination of the washing surface of the washing blade and the main surface of the pulsator, so that the front and rear flow of the laundry is more active than the conventional laundry which is only dropped after being lifted by the lift. This will contribute to the improvement of washing performance through the diversification of the flow form and water flow of the laundry.

1 is a cross-sectional view showing the structure of a general drum washing machine

Figure 2 is a longitudinal sectional view schematically showing the structure of a drum washing machine according to the present invention

FIG. 3A is an enlarged view of a portion A of FIG. 2 and illustrates a main cross-sectional view of a state in which a pulsator is fixed.

3B is an enlarged view of a portion A of FIG. 2 and is a sectional view of the main portion showing a state in which a pulsator is rotated;

4 is a perspective view illustrating a pulsator of the present invention

5 is a perspective view illustrating a pulley of the present invention;

6 is a rear perspective view of FIG.

7 is a perspective view of the rotor bushing of FIGS. 3A and 3B.

Explanation of symbols on main parts of drawing

1: cabinet 2: tub

2a: hanging spring 2b: damper

3: Drum 300: drum rear wall

3a: lift 4: rotor

4a: Rotor frame 5: Stator

6: Drum shaft 600: flange of the drum shaft

7: pulsator 7a: washing wing

8: pulsator shaft 800a: front side oilless bearing

800b: Rear side oilless bearing 9: Auto balancer

10: door 11: restraint

11a: solenoid 11b: plunger

11c: Compression spring 113: Bearing housing

113a: Front bearing 113b: Rear bearing

12: water seal 13: rotor bushing

13a: engagement portion of rotor bushing 13b: engagement portion of rotor bushing

13c: Reinforcement rib 130b: Positioning engagement protrusion

131b: Through hole 15 for fastening: Pulley

15a: rear wall of pulley 15b: side wall of pulley

15c: fitting portion of pulley 150a: fixing groove

16: Spider 17: fastening member

Claims (9)

A tub made of plastic material having a wall part for storing the washing water and fastening the driving part, the front side being inclined upwardly by a predetermined angle with respect to the ground; A drum rotatably installed inside the tub; A hollow drum shaft which penetrates the tub and is axially coupled to the drum inside the tub to transfer the driving force of the motor to the drum; At least one bearing supporting the hollow drum shaft; A bearing housing of a sleeve type for supporting the bearing; A stator fastened to the rear wall of the tub; A rotor coupled to the rear end of the drum shaft and constituting a BLDC motor together with a stator; A pulsator rotatably installed inside the drum; A pulsator shaft having a front end coupled to the pulsator, a rear end coupled to the pulley, and a serration formed at both ends for engagement with the pulsator and the pulley, the pulsator shaft being installed to penetrate the hollow of the drum shaft; A pulsator rotation control pulley positioned behind the rotor and coupled to a rear end of the pulsator shaft; And a restraining device for controlling the rotation of the pulsator in the drum through the restraint and release of the pulley. The method of claim 1, The pulsator shaft is drum washing machine, characterized in that supported by oilless bearings respectively installed in the front and rear. The method of claim 1, The restraint device, A solenoid fixed to the tub, a plunger moving forward and backward inside the solenoid, and a compression spring embedded in the solenoid to provide a forward force to the plunger, Drum washing machine characterized in that by the electrical on / off of the solenoid to the plunger restrains or releases the pulley to control the rotation or fixing of the pulsator. The method of claim 1, Drum washing machine characterized in that the rotor bushing is interposed between the drum shaft and the rotor. The method of claim 4, wherein The rotor bushing is a resin material, The fitting part which is engaged with the drum shaft in the center, Drum washing machine comprising a fastening portion extending radially around the engagement portion for the fastening with the rotor frame. The method of claim 1, A spider for reinforcing and supporting the rear wall of the drum is coupled to the rear wall of the drum, The front end of the drum shaft is formed with a flange in close contact with the spider, And the drum rear wall surface and the flanges of the spider and the drum shaft are fastened together by a fastening member penetrating them. The method of claim 1, And a serration formed at both ends of the pulsator shaft has an involute profile surface. The method of claim 1, The pulley, The part surrounding the rear wall of the rotor frame, The part surrounding the side wall of the rotor frame, A fitting portion with a pulsator shaft provided at a central portion of the rear wall of the rotor frame; Drum washing machine characterized in that it comprises a fixing groove formed in the portion surrounding the rotor frame of the pulley for restraint by the restraint device. The method of claim 8, The engaging portion of the pulley, The drum washing machine is formed as a boss, so as to be inserted and positioned inside the rear end of the hollow drum shaft during assembly.