KR100211878B1 - Power transfer apparatus of a washing machine - Google Patents

Abstract

The present invention relates to a power transmission device for a washing machine. In the related art, a brake band is wound around the outside of a brake drum to control the rotation of the brake drum, so that the brake action is concentrated on a part of the brake drum, thereby making the washing shaft and the dehydration shaft accurate rotation. There is a problem that does not come.

However, in the present invention, the lifting body 340 having a brake plate is installed on the tubular body 251 of the drum 250 so that the lifting body can be moved up and down, and the rotating body having the moving ball 330 below the lifting body 340. Since the magnetic material 420 which transmits the driving force 310 and the driving force is installed to transmit the driving force of the driving shaft 240, it is easy to control power transmission, and the rotation of the drum 250 is stably stopped by the brake plate 360. Washing and dehydration can be done accurately.

Description

Power train of washing machine

The present invention relates to a washing machine, and more particularly, to a power transmission device of a washing machine in which a washing shaft and a dehydration shaft are rotated by a driving force of a driving motor to wash and dehydrate.

In general, a washing machine is composed of washing, rinsing, and dehydration processes, and power required for washing, rinsing, and dehydration processes is received from a driving motor. Such a drive motor is installed inside the washing machine to perform a main function of rotating the washing shaft (washing rod) or rotating the dehydration shaft.

Referring to the power transmission structure of the washing shaft or dewatering shaft through the first diagram, one end of the drive shaft 12 is fitted to the belt pulley 11, the other end of the drive shaft 12 is a reduction portion ( 50) is installed. The deceleration unit 50 has a structure substantially like a planetary gear device.

On the other hand, in the center of the upper surface of the brake drum 40, the dehydration shaft 70 is formed to protrude in the upward direction. In addition, the washing shaft 60 is installed in the center of the dehydration shaft 70, the washing shaft 60 is connected to the gears of the reduction unit 50 is made to rotate. And the brake band 30 is wound on the outer side of the brake drum 40 described above.

Therefore, in the conventional power transmission structure, when the washing mode is set, the driving force of the driving motor (not shown) is transmitted to the belt pulley 11 through the belt 10, and the speed is reduced by the driving of the belt pulley 11. Since the contributions of the unit 50 are driven, the laundry shaft 60 is rotated, and the laundry is washed by a separate rotating plate (not shown) coupled to the laundry shaft 60.

However, the dehydration shaft 70 is not rotated at this time. The reason is that the rotational force is also generated in the brake drum 40 by driving the gears of the reduction unit 50, the brake band 30 is in close contact with the brake drum 40, the brake drum 40 is not rotated. Therefore, only the washing shaft 60 is rotated.

On the other hand, when the dehydration mode is set, since the brake band 30 is separated from the brake drum 40 by a predetermined interval, the brake drum 40 receives the driving force of the planetary gear and rotates it. Therefore, the dehydration shaft 60 formed on the brake drum 40 is rotated, and the washing tank (or dehydration tank) (not shown) coupled to the dehydration shaft 60 is rotated so that the laundry is dewatered.

However, such a conventional washing machine power transmission device is uniform in the brake drum 40 because the brake band 30 is wound on the outside of the brake drum 40 to interrupt the rotation of the brake drum 40 as shown in FIG. 1. There was a problem that one brake force was not applied.

That is, the brake drum 40 does not stop stably because the brake force acts in one direction due to the characteristics of the brake band 30. In particular, when the rotation direction of the brake drum 40 and the pulling direction of the brake band 30 are opposite to each other, the brake force of the brake drum 40 is improved, but in the opposite case, the brake force of the brake drum 40 is increased. A weakening problem has occurred.

For example, in recent years, washing machines 60 and dehydration shaft 70 are alternately rotated to increase washing efficiency. That is, by rotating the laundry shaft 60 and the dehydration shaft 70 to prevent the tangling of the laundry, and also to increase the washing and dewatering performance.

However, when a conventional power transmission device is applied to a recent washing machine, when the rotation direction of the brake drum 40 and the pulling direction of the brake band 30 are opposite to each other, the rotation of the brake drum 40 is quickly stopped. When the rotation direction of the brake drum 40 and the pulling direction of the brake band 30 are the same, the braid drum 40 is not stopped quickly but is stopped after a little more rotation.

Therefore, a malfunction occurs in which the washing shaft 60 and the dewatering shaft 40 are not accurately rotated, and thus various problems such as entanglement of the laundry are intensified.

The present invention has been made in order to solve the conventional problems as described above, the object of the present invention is to apply a uniform brake force to the dehydration shaft is dehydrated by a stable washing machine that can be precisely alternating rotation of dehydration shaft To provide a power train.

1 is a cross-sectional view showing a conventional power transmission device.

2 is an enlarged cross-sectional view showing main parts of the present invention.

(a) is an enlarged sectional view of the main part showing the state at the time of washing,

(b) is sectional drawing which showed the state at the time of dehydration.

3 is an exploded perspective view showing a rotating body of the present invention.

Figure 4 is an enlarged cross-sectional view showing the main portion showing the operating state of the drum stop means in the present invention,

(a) is sectional drawing which showed the state at the time of washing,

(b) is sectional drawing which showed the state at the time of dehydration.

5 is a plan view showing a state in which the rotating body is coupled to the lifting body in the present invention.

* Explanation of symbols for main parts of the drawings

210: case 220: belt

230: belt pulley 240: drive shaft

250: drum 251: tube

260: reduction unit 270: washing shaft

280: dewatering 310: rotating body

311: engaging projection 312: locking groove

320: groove groove 330: moving ball

340: lifting and lowering body 341: jamming projection

350: fixed piece 360: brake plate

370: support piece 380: spring

410: magnetic portion 420: magnetic material

421: jamming

Washing machine power transmission device of the present invention for achieving the above object is a lifting member which is rotated together with the support piece and the drum body of the drum installed outside the tube body of the drum and can be moved up and down; A fixing piece having a brake plate fixed to an outer circumferential surface of the elevating body; A spring installed between the support piece and the fixed piece; A rotating body having a plurality of inclined concave grooves into which a moving ball is inserted on an upper surface thereof, and a locking protrusion and a coupling protrusion formed on an outer circumferential surface thereof; It may be achieved by a dehydration rotating means installed on the outside of the drive shaft to raise the rotating body.

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

The basic configuration of the head drum described in FIG. 1 will be described with the same reference numerals.

As shown in FIGS. 2A and 3, the belt pulley 230 is connected to a drive motor not shown by the belt 220, and a drive shaft 240 is installed on the belt pulley 230. The drive shaft 240 is connected to the drum 250 to transmit the driving force, and the drum 250 is provided with a reduction unit 260, a washing shaft 270, and a dehydration shaft 280.

On the other hand, the lower body of the drum 250 is formed with a tube 251, the tube 251, the support piece 370, the lifting body 340, the fixing piece 350, the spring 380, and the rotating body ( 310 is installed, the lower portion of the tube 251 is provided with a dehydration rotating means.

First, the support piece 370 is formed in a substantially disk shape and is fixedly installed on the tube body 251 of the drum 250. On the other hand, the lifting body 340 is fixed to the tubular body 251 to be positioned below the support piece 370, the lifting body 340 is installed to be able to move up and down along the outer periphery of the tubular body 251 do. A plurality of locking projections 341 are formed to protrude from the lower side of the outer circumferential surface.

On the other hand, the fixing piece 350 is fixedly installed on the outer circumferential surface of the elevating body 340, the brake plate 360 is installed on the outside of the bottom surface is located below the brake plate 360 when the washing shaft 270 is rotated It is selectively in frictional contact with the case 210 portion.

In addition, the spring 380 is installed between the aforementioned support piece 370 and the fixed piece 350 to elastically press the support piece 370. And the rotating body 310 is installed in the lower end of the tubular body 251, a plurality of recess grooves 320 are formed on the upper surface, the moving ball 330 is inserted into the recess groove (320). At this time, the recess groove 320 is formed to be inclined to one side. In addition, a plurality of engaging protrusions 311 are formed on the outer circumferential surface thereof to engage with the engaging protrusions 341 of the lifting body 340, and a locking groove 312 is formed below the outer circumferential surface.

The dehydration rotating means is provided on the outside of the drive shaft 240, and performs a function of raising the rotating body 310 when power is applied by setting the dehydration mode. The dehydration rotating means is composed of a magnetic force portion 410 and a magnetic body 420, the first magnetic force portion 410 is formed in a substantially cylindrical shape, the outer side of the drive shaft 240, that is, the case outside the drive shaft 240 The magnetic force is generated when the power is applied to the wall.

On the other hand, the magnetic body 420 is installed on the drive shaft 240 so as to be raised and lowered by the magnetic force of the magnetic portion 410, the locking projection 421 is formed on the upper surface of the locking groove of the rotating body 310 ( 312). Therefore, the magnetic body 420 transmits the rotational force of the drive shaft 240 to the rotating body 310 when power is applied.

The operation and effects of the present invention configured as described above will be described in detail through the washing mode and the dehydration mode.

When the driving motor (not shown) is driven due to the setting of the washing mode, the driving force of the driving motor is transmitted to the belt pulley 230 through the belt 220. Accordingly, the belt pulley 230 is driven, and the drive shaft 240 fitted to the belt pulley 230 is rotated.

At this time, the drive shaft 240 is connected to the drum 250, so that the driving force is transmitted to the drum 250, the drum 250 is driven by the driving force of the drive shaft 240, but the washing shaft through the reduction unit Only 270 is rotated. To explain the reason, since the brake plate 360 of the fixing piece 350 installed on the tube body 251 of the drum 250 is in close contact with one surface of the adjacent case 210, the dehydration shaft 280 of the drum 250 is included. Is not rotated.

Therefore, in this state, since only the washing shaft 270 is rotated, laundry can be washed by a separate pulsator or laundry rod installed on the washing shaft 270.

Meanwhile, when the dehydration mode is set, power is applied to the magnetic force unit 410 and a magnetic field is generated. Therefore, the magnetic body 420 installed on the drive shaft 240 is lifted by the magnetic field and is engaged with the rotating body 310. That is, the locking protrusion 421 protruding on the outer circumferential surface of the magnetic body 420 is coupled to the locking groove 312 formed below the outer circumferential surface of the rotating body 310. Accordingly, the rotational force of the magnetic body 420 is transmitted to the rotating body 310 to rotate the rotating body 310, and is inserted into the recess groove 320 formed on the upper surface of the rotating body 310 by the rotation of the rotating body 310. The movable ball 330 is lifted up along the inclined plane as in FIG. 4 (a) (b).

Accordingly, the elevating body 340 in contact with the moving ball 330 is raised up as shown in FIG. 5 along the outer circumferential surface of the tubular body 251, and the fixing piece 350 fixedly installed on the outer circumferential surface of the elevating body 340 is also included. Is raised. In addition, the brake plate 360 installed on the bottom surface of the fixing piece 350 is separated from the case 210 by a predetermined interval as shown in FIG.

In addition, the lifting body 340 is caught by the engaging projection 341 formed on the outer circumferential surface and the engaging projection 311 formed on the outer circumferential surface of the rotating body 310, the rotational force of the rotating body 310 is transmitted. Therefore, the tubular body 251 on which the elevating body 340 is fixed is rotated by receiving the driving force of the driving shaft 240 through the magnetic body 420 and the rotating body 310, so that the dehydration shaft 280 is rotated, and the dehydration shaft ( The washing tank or dehydration tank (not shown) installed at 280 is rotated to dehydrate the laundry.

On the other hand, since the power is not applied to the magnetic force unit 410 when the dehydration mode is stopped or the washing mode is input, no magnetic field is generated in the magnetic force unit 410. Therefore, the magnetic body 420 that has been raised along the drive shaft 240 is lowered, so that the rotor 310 is not rotated anymore, and the lifting body 340 presses the moving ball 330 by the elastic pressing force of the spring 380. Since it is lowered, the brake plate 360 installed on the bottom surface of the fixing piece 350 is in close contact with the case 210. Therefore, the tube 251 is not rotated, only the washing shaft 270 is rotated by the drive shaft 240.

At this time, the brake force applied by the brake plate 360 is uniformly applied without being concentrated on a specific portion of the tube 251. That is, since the brake plate 360 is substantially circular, an equal braking force is applied to the fixed piece 350 and the tubular body 251. Therefore, the rotation of the tube 251 is made a quick and stable stop.

The uniformly acting brake force is further increased in the case of the dehydration shaft 280 alternately rotated because the rotation of the tubular body 251 is caused by the uniform brake force acting on the drum 250. Because it is always within a certain range. Therefore, since the right and left rotations of the dehydration shaft 280 are always made constant, the laundry is prevented from being entangled, and more precise washing operation can be performed.

On the other hand, the above-described embodiment is merely described as an example of a preferred embodiment of the present invention, the scope of application of the present invention is not limited to this, and can be changed appropriately within the scope of the same idea.

As described above, the present invention is installed so that the elevating body having a brake plate in the tubular body of the drum is capable of raising and lowering, and the lower body of the elevating body is provided with a rotating body having a moving ball and a magnetic body for transmitting the driving force to transfer the driving force of the drive shaft. Done. This power transmission device is easy to control the power transmission because the power transmission is made by the lifting and lowering of the magnetic material, and the rotation of the drum is stably stopped by the disc-shaped brake plate, so the washing and dehydration operation can be performed accurately. It can be a very useful effect.

Claims (2)

A power transmission device of a washing machine in which a driving force of a driving shaft is transmitted to a drum having a speed reduction unit, a washing shaft, and a dehydration shaft, the power transmission device comprising: a support piece (370) installed outside the tubular body (251) of the drum (250); Located on the lower portion of the support piece 370 is installed to rotate with the tube 251 of the drum 250, the engaging projection 341 is formed on the outside, and the lifting and lowering body 340 that can be moved up and down ; A fixing piece 350 fixedly installed at an outer circumferential surface of the elevating body 340 and having a brake plate 360 installed at an outer side of a bottom surface thereof; A plurality of springs (380) installed between the support piece (370) and the fixing piece (350); Located in the lower portion of the elevating body 340, a plurality of inclined indentation groove 320 is inserted into the moving ball 330 is formed on the upper surface, one or more engaging projections 311 is formed on the outer peripheral surface, A rotating body 310 having a locking groove 312 formed at an outer circumferential surface thereof; Is installed on the outside of the drive shaft 240, when the power is applied in the dehydration mode, the rotating body 310 is raised to dehydrate rotating means for rotating the drum 250; Delivery device. According to claim 1, wherein the dewatering rotation means is a substantially cylindrical magnetic force portion 410 is installed on the outside of the drive shaft 240 so that magnetic force is generated when the power is applied; It is installed on the drive shaft 240 so as to be raised and lowered by the magnetic force of the magnetic force unit 410, a locking projection 421 is formed on the upper surface is fitted into the locking groove 312 of the rotating body 310 drive shaft Magnetic transmission device for transmitting a driving force of the 240;