KR100487344B1 - method for switching driving power transmission mode of washing machine - Google Patents

Abstract

The present invention relates to a method of switching a power transmission mode of a washing machine in which a power transmission mode switching can be accurately performed. Move the coupling to the position when washing by driving the motor, and once the position movement is completed, the BLDC motor is stirred again left and right for a set time to complete the mode switching, and transfers the power to the power transmission mode that transfers power to the washing shaft and dewatering shaft. When switching is required, stir the BLDC motor to the left and right a set time, then drive the clutch motor to move the coupling to the position when dehydration, and when the position movement is completed, stir the BLDC motor again to complete the mode switching. Precise changeover prevents parts damage due to abnormal mode changeover and ensures optimum torque during stroke Degradation can also be prevented.

Description

Method for switching driving power transmission mode of washing machine}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine, and more particularly, a power transmission mode of a washing machine having a new power transmission mechanism in which washing and rinsing are performed by a pulsator rotating at a low speed, and dehydration is performed by a dehydration tank rotating at a high speed. It relates to a conversion method.

In general, a washing machine is a product that removes various contaminants attached to clothes, bedding, etc. by using the emulsification of the detergent and the friction action of the water flow due to the rotation of the washing blade, and the impact of the pulsator on the laundry. By detecting the amount and type of laundry, the washing method is automatically set, and the water level of the washing water is supplied to the appropriate level according to the amount and type of the laundry, and then washing is performed under the control of the microcomputer.

In addition, the driving method of the conventional fully automatic washing machine is a method of rotating the pulsator or the dehydration tank by transmitting the rotational power of the drive motor to the washing shaft through the power transmission belt and pulley, or to the dehydration shaft, and BLDC motor ( There is a method of rotating the washing tank and dehydration tank at different speeds when washing and dehydrating by speed control of Brushless DC Motor.

On the other hand, in recent years, while using a BLDC motor, the power transmission path is controlled differently, and when washing, the pulsator is rotated at low speed to perform washing, and when dewatering, the pulsator and dewatering tank are simultaneously rotated at high speed to operate in two modes. A structure has appeared, and a structure example of this manner will be described with reference to FIGS. 1 to 2B.

Dehydration tank (2) which is a combined use of the washing tank rotatably installed in the outer tank (1) of the main body, and a pulsator (3) installed in the dehydration tank (2), but rotatably installed independently of the dehydration tank (2). And a dehydration shaft 5 which is rotatably supported by the axial support bearing case 20 (refer to FIG. 2A) and transmits rotational power to the dehydration tank 2, and washes to transmit rotational power to the pulsator 3. The power transmission path of the BLDC motor 7 in response to the washing stroke or the dehydration stroke and the BLDC motor 7 in which the rotor 7b rotates as the shaft 4 and the stator 7a are energized, are supplied to the washing shaft 4. Or a clutch mechanism switchable to the dehydration shaft (5).

In this case, the clutch mechanism includes a clutch motor 6 installed below the outer tub 1, a cam 600 coupled to the drive shaft 602 of the clutch motor 6, and the shaft support bearing case 20. Lever 30 is fixed on the groove, and the groove 800 and the inclined surface 801 having a linear movement and linearly guided by the guide of the lever guide 30 when the clutch motor 6 is driven A lever 8 having a flat surface 802 extending horizontally from the cam, and between the cam 600 and the lever 8 of the clutch motor 6 so as to be 'on' the lever 8 of the clutch motor 6. ) Is connected to the connecting rod 17 to pull the clutch motor 6 side, and one end is fixed to the front end of the lever guide 30 and the other end is fixed to the engaging projection 803 on one side of the lever 8 (8) abuts against the return spring (14) for imparting a return force and the groove (800) having the inclined surface (801) of the lever (8) when dewatering, and then inclining when switching to the washing mode. A hollow cylinder-type movable member 9 which is lowered on the flat surface 802 by the 801 and a plunger installed to be elevated along the guide groove 900 inside the movable member 9 ( 10), a buffer spring 11 positioned between the mover 9 and the plunger 10, and a gear 221 fixed to the lower portion of the axial support bearing case 20 and formed along the circumferential direction is provided. One end is hinged to the lower end of the coupling stopper 22 and the plunger 10, and a middle point is hinged to the lower end of the support bracket 220 formed below the coupling stopper 22. BLDC while elevating along the dehydration shaft 5 along the rotational direction of the fork-shaped movable rod 12 and the movable rod 12 in a fork-shaped movable rod 12 centered around one point of the hinge-coupled intermediate portion. Coupling 15 for switching rotational power transmission path of motor 7 and rotor 7b The rotational force is configured to include a connector assembly 16 which is interposed to be transmitted to the washing shaft (4).

3 and 4, the cam 600 is directly coupled to the drive shaft 602 such that the cam 600 rotates at a constant speed when the drive shaft 602 is rotated, and the drive shaft 602 is rotated. Cam 600 is also stopped at the stop position, the operation relationship between the cam and the switch will be described as follows.

First, in the state where the cam 600 is located at the initial point, the switch 650 maintains the off state. Here, the state where the cam 600 is located at the initial point is a state in which the rod connecting shaft 601 of the cam 600 faces the initial point direction as shown in FIG. 5C.

In this state, when the power transmission path is switched for washing, the clutch motor 6 is turned on and driven, thereby rotating the cam 600 clockwise. At this time, since the projection 650a of the switch 650 is located on the cam groove surface 600a until the rotation angle of the cam 600 reaches a position that is 150 degrees from the initial point, the switch 650 is turned off. State is maintained.

Then, when the rotation angle from the initial point of the cam 600 reaches 150 degrees, the projection 650a of the switch 650 is out of the cam groove surface 600a of the cam 600, so that the switch 650 is turned on. (on)

As such, when the rotation angle from the initial point of the cam 600 reaches 150 degrees, the peak of the gear 151 of the coupling 15 and the peak of the gear 221 of the coupling stopper 22 It is in a state of being in mutual engagement.

However, even after that, the on state of the clutch motor 6 continues, and when the cam 600 reaches the point 170 degrees from the initial point as shown in FIG. 5A, the clutch motor 6 is turned off. Thus, the clutch motor 6 ) Is turned off at the maintenance point of the cam 600 in order to more reliably switch the power to the washing mode.

On the other hand, when dehydration after washing is completed, the cam 600 should return to the initial point position.

To this end, when the power is switched to the dehydration mode, the clutch motor 6 is turned on again to rotate the cam 600 clockwise. At this time, the switch 650 maintains the on state, and when the rotating cam 600 passes the point 328 degrees clockwise from the initial point (158 degrees clockwise from the holding point), the protrusion of the switch 650 ( 650a is positioned on the cam groove surface 600a, whereby the switch 650 is turned off by contact dropping (see FIG. 5B).

Thereafter, even if the switch 650 is switched to the off state, the clutch motor 6 remains in the on state until the cam 600 reaches the initial point under the control of the microcomputer, so that the cam 600 is positioned at the initial point. Is off.

At this time, to keep the clutch motor 6 in the 'on' state immediately after the switch 650 is turned off until the cam 600 reaches the initial point is the AC power pulse supplied to the clutch motor 6. It is made by counting the number of times. Since the cycle of one rotation of the clutch motor 6 is constant, if the angle of arrival (that is, 32 degrees) from the off point of the switch 650 to the initial point is divided by one cycle, the clutch motor 6 The on-time holding time of is calculated and the actual clutch motor 6 control is performed by counting the number of pulses corresponding thereto.

On the other hand, in the state where the cam 600 is located at the initial point as described above, not only the gear teeth 151 of the coupling 15 and the gear teeth 221 of the coupling stopper 22 are released, but the coupling ( 15) The upper serration 150a and the lower serration 150b of the inner circumferential surface of the lower serration 161b on the outer circumferential surface of the upper end of the inner connector 16b coupled to the washing shaft 4 and the lower end of the dehydration shaft 5 By being engaged with each other at the same time, the dehydration by simultaneous rotation of the washing shaft 4 and the dewatering shaft 5 can be made.

The method of switching to the pulsator mode used when the washing or the rinsing stroke is performed among the power transmission mode switching methods of the washing machine configured as described above is as follows.

The clutch mechanism according to the present invention maintains a state in which the coupling 15 is lowered as shown in FIG. 2B as an off state in which power is not applied to the clutch motor 6 before washing is started.

That is, at this time, the mover 9 is located in the groove 800 having the inclined surface 801 of the lever 8, and the coupling 15 is located at the bottom dead center.

In this state, when power is applied to the clutch motor 6 and the clutch motor 6 is on, the driving force of the clutch motor 6 is transmitted to the cam 600, and the cam 600 rotates. By the movement, the connecting rod 17 is moved toward the clutch motor 6, whereby the lever 8 is guided by the lever guide 30 and the lever 8 is pulled toward the clutch motor 6.

At this time, the return spring 14 installed at the rear end of the lever guide 30 is tensioned.

On the other hand, when the cam 600 rotates, the mover 9 which contacts the inclined surface 801 of the lever 8 is pushed down by the inclined surface 801, and a point in time at which the cam 600 is located at a holding point. In FIG. 2A, the mover 9 is positioned below the flat surface 802 of the lever 8.

In this way, when the movable member 9 is lowered due to the rotation of the cam 600 to the holding point and the movement of the lever 8 toward the clutch motor, the movable member 9 compresses the shock absorbing spring 11. Accordingly, the plunger 10 installed to move up and down along the guide groove 900 of the mover 9 is also lowered.

Subsequently, the movable rod 12 hinged to the plunger 10 according to the lowering of the plunger 10 is a support bracket 220 of the coupling stopper 22 fixed to the lower portion of the shaft support bearing case 20. It rotates counterclockwise on the drawing about the fixing pin 12b at one point of the middle portion penetrating the center.

In this way, when the movable rod 12 is rotated counterclockwise in the drawing about the fixing pin 12b, the tip of the movable rod 12 contacts the lower surface of the coupling 15 so that the coupling ( 15) is pushed up along the dehydration shaft (5) in the axial direction.

Accordingly, upon completion of power switching to the washing mode, the gear 151 formed at the upper end of the coupling 15 is fixed to the lower surface of the shaft support bearing case 20 as shown in FIG. 2A. The gear provided in the stopper 22 is matched to 221.

In addition, when the gear 151 of the coupling 15 is engaged with the gear 221 of the coupling stopper 22 in this manner, the coupling 15 is out of the connector assembly 16, so that Only the washing shaft 4 is rotated during rotation.

That is, during washing, the coupling 15 is engaged only with the serration of the outer circumferential surface of the dehydration shaft 5, and is not engaged with the serration 161b of the upper end of the inner connector 16b engaged with the washing shaft 4. Therefore, the rotational power of the rotor 7b is transmitted only to the pulsator 3 through the washing shaft 4.

In the state where the gear 151 of the coupling 15 is engaged with the gear 221 of the coupling stopper 22, the rotation of the coupling 15 is caused by the gear 221 of the coupling stopper 22. Is prevented.

Next, the method of switching to the dehydration tank mode according to the dehydration is as follows.

When washing is performed in the state as shown in FIG. 2A, when washing is completed and power transmission path switching to a dehydration tank mode is required for dehydration, power is supplied to the clutch motor 6 again to drive the clutch motor. As a result, the cam 600 rotates.

As such, when the cam 600 of the clutch motor 6 rotates to move to the dewatering position, the lever 8 is moved away from the clutch motor 6 by the restoring force of the return spring 14.

Accordingly, in the washing mode, the movable member 9 in contact with the flat surface 802 of the lever 8 is inclined surface 801 of the lever 8 when the return of the lever 8 is completed as shown in FIG. 2B. The groove 800 is provided.

As such, when the movable member 9 rises due to the movement of the lever 8, the compressive force applied to the shock absorbing spring 11 is alleviated, and thus the movable member 9 can be elevated along the guide groove 900 of the movable member 9. The installed plunger 10 is also raised.

Subsequently, the movable rod 12 hinged to the plunger 10 as the plunger 10 rises is supported by the support bracket 220 of the coupling stopper 22 fixed to the lower portion of the axial support bearing case 20. It rotates clockwise on the drawing (refer to FIG. 2A) centering on the fixing pin 12b installed through.

Then, as the movable rod 12 rotates clockwise in the drawing about the fixing pin 12b, the tip of the movable rod 12 supports the coupling 15 along the dewatering shaft 5. The force pushing up in the axial direction is removed.

As the bearing force of the movable rod 12 with respect to the coupling 15 is removed as described above, the coupling 15 is lowered by the self-weight and the restoring force of the compression spring 40, and thus the coupling 15 The gear teeth 151 of the c) come out of the gear 221 of the coupling stopper 22.

When the coupling 15 is completely lowered, the serrations 150a and 150b of the inner circumferential surface of the coupling 15 are serrations 161b on the outer circumferential surface of the upper end of the inner connector 16b coupled to the washing shaft 4. And it is engaged with the serration of the lower end of the dehydration shaft (5), respectively, so that the high-speed rotation of the washing shaft (4) and the dehydration shaft (5) during the high-speed rotation of the rotor (7b) proceeds to dehydration.

The above-mentioned washing machine converts the power transmission path of the BLDC motor into a pulsator or a dehydration tank by using a clutch. Since the gear shifting of the coupling and the gear shifting of the coupling stopper are engaged, the physical switching method is used. If washing or dehydration is performed in a state where the physical coupling is not made correctly, there is a problem that the related parts may be damaged or washing may not be performed normally.

Accordingly, an object of the present invention is to provide a method for switching a power transmission mode of a washing machine in which the power transmission mode switching can be accurately performed.

In the present invention, when switching to the power transmission mode for transmitting power only to the washing shaft is required, the BLDC motor is stirred left and right, and then the clutch motor is driven to move the coupling to the washing position and the position movement is completed. After the BLDC motor is stirred again left and right for setting cycle to complete the mode switching, if it is required to switch to the power transmission mode that delivers power to the washing shaft and dewatering shaft, the BLDC motor is stirred left and right for the setting cycle and then the clutch motor Drive the coupling to the position when dehydration, and when the position movement is complete, the left and right stirring the BLDC motor again characterized in that the mode conversion is completed.

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

7 is a flowchart illustrating a method of switching a power transmission mode of a washing machine according to the present invention.

In the method of switching the power transmission mode of the washing machine according to the present invention, as shown in FIG. 7, first, it is determined whether the switching to the pulsator mode is required (S31).

Subsequently, when the determination result (S31) is to be switched to the pulsator mode, the left and right stirring is performed N times (for example, two times) so as to have an angle smaller than the rotation angle when the BLDC motor 7 is momentarily washed. ) Or for a set time (1 to 3 seconds) (S32).

At this time, the serrations 150a and 150b of the inner circumferential surface of the coupling 15 are de-shrunk due to the staggering of the dehydration shaft 5 engaged with the coupling 15 and the inner connector 16b when switching to the pulsator mode. (5) Receiving the surface pressure acting in the opposite direction from the serration 161b of the upper end and the serration of the inner connector 16b may cause the coupling 15 to be restrained when the clutch motor is driven. have. Therefore, before performing the step of raising the coupling 15 to the washing mode position, the step of inverting the BLDC motor 7 to the left and right to release the coupling 15 is performed. This prevents the phenomenon of rising.

Then, the clutch motor is driven (S33), the cam 600 is rotated, and it is determined whether the switch 650 is 'on' (S34).

Subsequently, when the switch is 'on', the determination result (S34) counts the number of AC power input pulses and determines whether the counting value is greater than or equal to a preset pulse number, for example, '66' (S35).

The driving of the clutch motor by counting the number of pulses while the switch is 'on' is for the gear teeth of the coupling and the gear stop of the coupling stopper to be firmly engaged.

Then, when the determination result (S35), the number of AC power input pulse is more than the predetermined number of pulses to stop the clutch motor (S36), the BLDC motor 7 instantaneously left and right to have a smaller angle than the rotation angle when washing. Stirring is performed N times (for example, twice) or for a set time (1 to 3 seconds) (S37).

The left and right agitation is performed twice to prevent the gears of the coupling and the gears of the coupling stopper from operating in an incomplete state due to a motor or mechanical abnormality.

On the other hand, when the determination result (S31), washing or rinsing is completed and should be switched to the dehydration tank mode in order to perform the dehydration, left the BLDC motor 7 to have an angle smaller than the rotation angle at the moment of washing. In this case, stirring is performed N times (for example, twice) or for a set time (1 to 3 seconds) (S38).

At this time, when switching to the dehydration tank mode, the gear teeth 151 of the coupling 15 and the gear stops 221 of the coupling stopper 22 are staggered by a misalignment with the coupling stopper 22 engaged with the coupling 15. When the surface pressure in the opposite direction between the () between the actuation of the clutch motor (6) can cause the phenomenon that the lowering of the coupling 15 is restrained. Therefore, the step of inverting the BLDC motor 7 to the left and right to release the coupling 15 immediately before performing the step of lowering the coupling 15 to the dehydration mode position.

Then, the clutch motor is driven (S39), the cam 600 is rotated, and it is determined whether the switch 650 is 'off' (S40).

Subsequently, when the switch is 'off', the determination result (S40) counts the number of AC power input pulses and determines whether the counting value is greater than or equal to a predetermined pulse, for example, '66' (S41).

In this case, the driving of the clutch motor by counting the number of pulses in the 'off' state of the switch is to completely disengage the gear teeth of the coupling and the gear teeth of the coupling stopper.

When the determination result (S41), the number of AC power input pulse is more than the predetermined number of pulses to stop the clutch motor (S42), the BLDC motor 7 instantaneously left and right to have a smaller angle than the rotation angle when washing. Stirring is performed N times (for example, twice) or for a set time (1 to 3 seconds) (S43).

The left and right agitation is performed twice in order to prevent the gears of the coupling and the gears of the coupling stopper from operating in a state in which the coupling between the gears of the coupling and the coupling stopper is not completely released.

In the method of switching the power transmission mode of the washing machine according to the present invention, in switching the pulsator mode and the dehydration tank mode, the BLDC motor is momentarily stirred left and right before and after performing the mode switching by driving the actual clutch motor. This makes it possible to prevent damage to parts due to abnormal mode switching and to generate the optimum torque during the stroke, thereby preventing the washing performance deterioration.

1 is a schematic diagram of a fully automatic washing machine

2A and 2B are principal part longitudinal sectional views which show the action of the clutch mechanism of FIG.

3 is a perspective view of the clutch motor of FIG.

4 is an exploded perspective view of FIG.

5A to 5C are schematic diagrams for explaining an operation relationship between a cam and a switch when the clutch motor is driven.

Figure 5a is a state diagram of the cam and switch at the washing mode maintenance point

5B is a cam and switch state diagram immediately before switching to the dehydration mode;

5C is a cam and switch state diagram at an initial point

6 is a time chart showing an operation relationship between a clutch motor, a cam, and a switch;

7 is a flowchart illustrating a method for switching a power transmission mode of a washing machine according to the present invention.

Claims (3)

A BLDC motor comprising a rotor connected to a washing shaft and a stator installed outside the rotor to form a driving source of the washing machine, a clutch motor that raises or lowers a coupling to be sent to a position during washing and dehydration, and the clutch Power transmission mode of a washing machine equipped with a coupling that transfers power only to the washing shaft when washing by moving up or down in conjunction with the driving of the motor and simultaneously transmitting power to the washing shaft and a dehydrating shaft installed outside the washing machine when dewatering. In the switching method, When switching to a power transmission mode that transfers power only to the washing shaft is required, the BLDC motor is stirred left and right, and then the clutch motor is driven to move the coupling to the washing position and again when the position movement is completed. Stir the BLDC motor left and right at the set time to complete the mode switching. When switching to the power transmission mode that transfers power to the washing shaft and dewatering shaft is required, the BLDC motor is stirred left and right a set time, and then the clutch motor is driven to move the coupling to the position when dehydration and move the position. When the completion of the power transmission mode switching method of the washing machine, characterized in that to complete the mode switching by stirring the left and right BLDC motor again. According to claim 1, The step of stirring the left and right BLDC motor is a step of stirring the power transmission mode of the washing machine, characterized in that the step of stirring at a small angle compared to the rotation angle of the BLDC motor during washing or rinsing. According to claim 1, The step of stirring the left and right BLDC motor is a step of performing the left and right stirring for N times or a set time, the power transmission mode switching method of the washing machine.