KR200236492Y1 - Device for power transmit in drum type washing machine - Google Patents

Abstract

The present invention relates to a power transmission device for a drum washing machine, and to improve the efficiency of the system by reducing the variable speed range of the motor for transmitting power to rotate the washing tank.

In order to realize this, the power transmission device of the present invention includes: a worm gear unit provided at the motor side; Bevel gear portion provided in the drive shaft of the washing tank; And a shaft for transmitting a driving force between the worm gear part and the bevel gear part.

Accordingly, it is possible to transfer the variable power from the motor to the washing tank using a large gear ratio, the motor can be operated in a high efficiency state, there is an advantage that the applied voltage of the washing machine can also be reduced.

Description

Device for power transmit in drum type washing machine

The present invention relates to a drum washing machine, which is a kind of washing machine, and more particularly, to a power transmission device for rotating a washing tank by transmitting a driving force generated from a motor during operation of a washing machine.

In general, a washing machine includes a pulsator type, an agitator type, a drum type, and the like. Among them, the drum type washing machine has no noise compared to other washing machines, so it is less noise, and is mainly used as a large-capacity business washing machine due to the small amount of water used. Recently, the drum type washing machine has been developed for home use.

The apparatus shown in FIG. 1 is described as an example of a drum washing machine according to the prior art.

The drum type washing machine is provided with an outer tub (4) supported by a spring (2) and a damper (3) as a shock absorber inside the outer case (1), and rotatably provided inside the tub (4) for washing and dehydration. An inner tank 5 to be performed, a motor 6 as a power source, and a power transmission device for transmitting the rotational driving force of the motor 6 to the inner tank 5.

The power transmission device includes a motor pulley (7) installed on the motor shaft (6a), a laundry pulley (8) provided on the drive shaft (5a) of the inner tank (5), a laundry pulley (8) and a motor pulley (7). It consists of a belt 9 to connect.

In the figure, reference numeral 10 denotes a door.

The drum-type washing machine according to the related art configured to fill the washing water at a predetermined level in the outer tank 4 and rotate by applying power to the motor 6 in a state in which laundry and a predetermined amount of detergent are put in the inner tank 5. do.

When the motor 6 rotates, the rotational force is sequentially transmitted to the inner tank drive shaft 5a through the motor pulley 7, the belt 9, and the laundry pulley 8 so that the inner tank 5 rotates.

At this time, the three large washing blades not shown in the drawings formed on the inner tank 5 draws the laundry out of the water according to the rotation of the inner tank 5, and when the washing wing is at a predetermined angle, the laundry is moved by gravity and the laundry. It will fall freely on the tax solution, and in this way the laundry and the mechanical force and frictional forces are transmitted to perform the laundry administration.

After performing the washing stroke, the rinsing stroke in the same manner, and after the rinsing stroke, the inner tank 5 is rotated at high speed in one direction to perform the dehydrating stroke.

Here, the inner tank 5 should have a rotational force of about 600 to 1,000rpm because it requires about 50rpm when washing, and a fast rotational force when dehydrating, and this rotational force is the rotational force of the motor 6 and each pulley 7 Provided in accordance with the ratio in (8).

Therefore, since the ratio of the washing pulley 8 and the motor pulley 7 is fixed at about 12: 1, the motor 6 rotates at about 500 rpm in the washing stroke to obtain the rotational force of the inner tank 5 as described above. The hour means that it should rotate about 7,000 to 10,000 rpm. That is, the motor 6 must operate in a very wide speed range.

In the drum washing machine driven as described above, the efficiency of the motor 6, which is the driving source of washing, is generally the best at the rated output, and the efficiency is greatly reduced as it is out of this rated point.

However, since the motor used in the aforementioned drum washing machine obtains power by using a pulley and a belt, the variable speed range is about 500 to 10,000 rpm depending on the dehydration or washing stroke.

Due to this phenomenon, the motor according to the prior art is lowered in efficiency beyond the rated point, and there is a problem that power consumption of the washing machine must also be increased for the rotation of the motor.

The present invention is designed to solve the problems of the prior art as described above, and is intended to improve the efficiency of the motor by reducing the variable speed range so that the motor, which is the power source for rotating the washing machine, can be operated within the rated output range. There is this.

In addition, the purpose is to reduce the power consumption of the motor through this to improve the life of the motor.

1 is a cross-sectional view of a drum washing machine according to the prior art.

Figure 2 is a structural view of the power transmission unit of the drum washing machine according to the prior art.

3 is a structural view of a power transmission unit according to an embodiment of the present invention.

Figure 4 is a perspective view of the configuration of a worm gear applied to the present invention.

6 is a bevel gear application according to an embodiment of the present invention.

Figure 7 is a shaft coupling state in accordance with an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

2: spring 3: damper

4: outer tank 5: inner tank

5a: inner cylinder drive shaft 6: motor

16a: floating shaft 16b: fixed shaft

17: worm gear 18: bevel gear

19: spring 20: assembly

21: solenoid

The present invention for realizing the above object is the outer tank supported by the spring by the spring, the damper supported by the lower end to reduce the vibration of the outer tank, the drive means for rotating the inner tank in the outer tank, and the drive In a drum washing machine comprising a motor which is the power source of the means:

The drive means,

A worm gear receiving power of the motor;

Bevel gear consisting of a plurality of paths to vary the amount of drive transmitted from the worm gear to the drive shaft of the inner tank; And

And a shaft for transmitting a driving force from the worm gear to the bevel gear.

Preferably, the shaft is multistage; At least one shaft having a bevel gear is characterized in that the flow up and down by the control of the solenoid to select a plurality of paths of the bevel gear.

In this way, the inner worm gear can be appropriately decelerated by a certain amount of rotational power generated from the motor by the worm gear on the motor side, which can reduce the rotational speed through a large gear ratio, and the bevel gear on the inner side of the inner shaft drive shaft connected by the shaft, and the gear ratio can be switched. It can be transferred to the drive shaft.

As a result, since the variable speed range of the motor can be reduced by using a high gear ratio without using a pulley as in the related art, there is an advantage that the efficiency of the motor for transmitting rotational force to the washing machine inner tank can be improved.

In addition, by reducing the input voltage of the washing machine can reduce power consumption and extend the life of the motor.

There may be a plurality of embodiments of the present invention having the above structure, and the most preferred embodiments will be described in detail below.

This preferred embodiment enables a better understanding of the objects, features and effects of the present invention.

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

In addition, in drawing used for description, about the component similar to the prior art, the same code | symbol is attached | subjected, and the overlapping description may be abbreviate | omitted.

Figure 3 shows the present invention power transmission device as compared to the prior art of Figure 2, Figure 4 shows a worm gear coupled state applied to the present invention, Figure 6 shows the coupled state of the bevel gear.

In the power transmission device according to the present embodiment, two pairs of worm gears 17 engaged with each other are provided on the side of the motor 6, and two pairs of bevel gears 18, with two pairs of meshing bevel gears 18, are driven in the inner tank. It is provided in, the worm gear 17 and the bevel gear 18 is a power transmission by the shaft (16a, 16b).

In addition, the bevel gear 18 is formed in a two-step tooth shape having the inner shaft 5a of the inner tank concentric to the inner tank 5 so as to switch the driving force, and the shaft is capable of vertical flow so that the above-mentioned switching is possible. It is divided into a flow shaft 16a and a fixed shaft 16b fixed to the motor side worm gear 17.

In addition, the two shafts (16a, 16b) are coupled by the coupling body 20, as shown in Figure 3 and 7 receives the rotational force, so that the solenoid 21 to flow the flow shaft (16a) up and down ) Is provided with an elastic spring 19. The solenoid 21 can change the gear ratio of the bevel gear 18 by changing the position of the flow shaft 16a upward or downward every time it is used.

Looking at the power transmission process of the drum washing machine according to the embodiment in the state configured as described above are as follows.

First, the washing water of a predetermined level is filled in the outer tank 4, and power is applied to the motor 6 in a state in which laundry and a predetermined amount of detergent are put into the inner tank 5 to generate rotational power.

And the rotational force of the motor 6 is reduced by the gear ratio of about 1/10 in the worm gear 17 to rotate the fixed shaft 16b.

At this time, the fixed shaft 16b and the flow shaft 16a coupled by the coupling body 20 rotate together to transmit rotational power to the bevel gear 18, and by the action of the interlocking bevel gear 18. The transmitted rotational power rotates the inner tank driving shaft 5a to rotate the inner tank 5.

In particular, during the washing stroke, in which the rotational force transmission from the motor 6 must be greatly reduced in the operation of the washing machine, the bevel gear 18 attached to the end of the flow shaft 16a has a large radius of the inner tank drive shaft 5a. By engaging it, the rotational power transmitted from the flow shaft 6a can be greatly reduced.

In addition, during the dehydration operation in which the rotational force transmission from the motor 6 needs to be slowed down, the flow shaft 16a is raised while compressing the spring 19 by the action of the solenoid 21 to which power is applied. The bevel gear 18 is engaged at a small radius of the inner tubular drive shaft 5a to transfer the rotational power from the flow shaft 16a to the inner tubular drive shaft 5a as it is or to reduce it slightly.

On the other hand, as a comparative example, that is, the conventional power transmission device uses a pulley ratio and a belt structure to reduce the speed from a motor having a high rotational speed. It can be seen that the design can greatly reduce the variable speed range of the motor by transmitting power using a gear structure having a variable gear ratio.

That is, the washing stroke rotates the motor at a higher speed than before, and when dehydrating, the motor can be operated at a slower speed than before, thereby reducing the operating range of the motor as compared with the conventional one.

In this result, the present invention can improve the efficiency of the motor, thereby reducing the power consumption of the washing machine.

In addition, when the power transmission device of the present invention is used, the two shafts 16a and 16b are pre-attached to the inner tank drive shaft 5a and the motor 6, respectively, and then the two shafts are simply fitted when assembling the finished product of the washing machine. It also improves workability.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

As described above, the power transmission device of the drum washing machine of the present invention can greatly reduce the variable speed range of the motor, thereby improving the operation efficiency and life of the motor.

In addition, it is possible to reduce the input voltage of the washing machine can reduce the power consumption required to drive the product.

Claims (2)

A drum comprising an outer tub supported by a spring by a spring, a damper supported at a lower end to reduce vibration of the outer tub, driving means for rotating the inner tub in the outer tub, and a motor as a power source of the driving means. In the washing machine: The drive means, A worm gear that receives the power of the motor; Bevel gear made of a plurality of paths so as to vary the drive amount transmitted from the worm gear to the drive shaft of the inner tank; And And a shaft transmitting the driving force from the worm gear to the bevel gear. The method of claim 1, The shaft consists of multiple stages; At least one end of the shaft is provided with the bevel gear is a power transmission device of the drum washing machine, characterized in that the flow up and down by the control of the solenoid to select a plurality of paths of the bevel gear.