JP2846824B2 - Power transmission device for washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a fully automatic washing machine, and more particularly to a power transmission device for preventing noise caused by a metal strike at a power transmission portion when a clutch lever is operated.

[0002]

2. Description of the Related Art FIG. 1 is a side sectional view showing an internal structure of a conventional washing machine. In FIG. 1, reference numeral 100
Is a main body of the washing machine. Inside the main body 100, a water tub 200, a washing tub 300, a pulsator 400, and a driving unit 5 are provided.
00 is provided. The water tank 200 stores a certain amount of washing water required for washing. In addition, the washing tub 300
It is provided inside the water tub 200, and stores laundry, washing water, and the like. In addition, the pulsator 400 is provided below the inside of the washing tub 300 and agitates the laundry, washing water and the like put into the washing tub 300. Further, the driving unit 500 is provided at a lower portion outside the water tub 200 and drives the washing tub 300 or the pulsator 400.

A driving unit 500 is provided below the outside of the water tank 200 to generate power.
0 to the washing tub 300 or the pulsator 40
And a power transmission unit 600 for driving the power transmission unit 0. A motor pulley 512 and a clutch pulley 610 are rotatably attached to the motor 510 and the power transmission unit 600, respectively.
A belt 540 is applied between the belt 10 and the belt 10.

Further, a drain hose 222 is connected to the lower side of the water tank 200, and the drain hose 222 is provided with a drain valve 220. The drain valve 220 is normally operated by a drain motor (not shown),
The clutch lever 620 is operated in conjunction with the drain valve 220 so that a washing process (or a rinsing process) and a dehydrating process are performed in a washing manner. That is, during washing or rinsing, the drain valve 220 is closed and the motor 500
Is transmitted to the pulsator 400 via the pulleys 512 and 610 and the power transmission unit 600. Accordingly, the pulsator 400 operates to stir the washing water, the laundry, the detergent, and the like in the washing tub 300 to perform the washing (or rinsing) process. On the other hand, at the time of dehydration, while the drain valve 220 is opened by the operation of the drain motor (not shown),
The power of motor 500 is transmitted to washing tub 300. Accordingly, the washing tub 300 rotates at a high speed and performs dehydration by centrifugal force.

FIG. 2 is a side sectional view partially cut away to specifically show the structure of the power transmission section 600 in FIG. In FIG. 2, reference numeral 610 indicates that the power of the motor 510 is controlled by the pulley 512 and the belt 540 as shown in FIG.
The clutch pulley is rotated by being transmitted through the clutch pulley. The clutch pulley 610 includes shafts 612a, 612
Rotate around b. The shaft 612a is connected to the shaft 612b via a transmission 614 having a predetermined transmission ratio, and the pulsator 400 is fixed to the end of the shaft 612b as shown in FIG.

The shafts 612a and 612b and the transmission 61
4, a brake drum 631 is attached to the case member 64.
It is provided to be rotatable within zero. The brake drum 631 is rotatably provided separately from the shafts 612a and 612b.

One side of the case member 640 has a fixed side 642
The fixed side 642 has a clutch lever 6
20 and a brake lever 635 are rotatably provided. As described above, the clutch lever 620 is provided so as to interlock with the operation of the drain valve 220 (FIG. 1).
The brake lever 635 is provided to interlock with the clutch lever 620. These levers are provided so as to rotate in a predetermined direction by the elastic force of the elastic members 621a and 621b, respectively.

Further, on one side of the clutch lever 620,
A braking portion 622 is formed, and the braking portion 622 restricts rotation of the clutch lever 620 by the elastic member 621a by contact with the case member 640. Further, one side of the brake band 644 is fixed to the case member 640 by a fastening member 643. The elastic member 630 is wound around the outer peripheral edge of the lower end of the shaft 612 a and transmits the rotational force of the clutch pulley 610 to the brake drum 631 according to the operation of the clutch lever 620.

The power transmission unit 600 constructed as described above
Performs a washing operation (or a rinsing operation) and a dehydrating operation selectively. During the washing operation, the rotation of the pulley 610 and the shafts 612a and 612b causes the shaft 612b to rotate.
The pulsator 400 attached to the connector 632 is rotated, and power is transmitted to the elastic member 630, the brake drum 631, and the connector 632 during the spin-drying operation, so that the washing tub 300 attached to the connector 632 rotates.

FIG. 3 is a partially enlarged view showing a main part of the power transmission unit shown in FIG. According to FIG. 3, notches 641 a and 641 b are formed on the side surface of the case member 640, and a side 642 of which one side is fixed to the case member 640.
, A clutch lever 620 and a brake lever 635 are rotatably provided.

The clutch lever 620 and the brake lever 6
The clutch lever 6 is rotated in one direction from the side 642 by the elastic members 621a and 621b.
Reference numeral 20 is provided so that the rotation is stopped by the contact between the braking portion 622 and the case member 640. That is, the rotation is stopped by the braking unit 622 coming into contact with the inner wall on one side of the cutout portion 641a of the case member 640. The brake lever 635 is provided so that the rotation is stopped by the clutch lever 620.

One side of the brake band 644 is fixed to a brake lever 635 by a pin 637.
The other side is a fastening member 643 between the notches 641a and 641b.
Has been concluded. Therefore, the brake band 6
44 is provided so as to surround the periphery of the brake drum 631 located inside the case member 640 via the cutout portions 641a and 641b.

The operation of the power transmission unit 600 constructed as described above will now be described in detail with reference to FIGS. 4 (a) and 4 (b).

First, during the washing (or rinsing) step, the drain valve 220 (see FIG. 1) is closed. With the drain valve 220 closed, the clutch lever 620
The brake lever 635 is pivoted to one side by the elastic members 621a and 621b as shown by the solid line in FIG. 4A, and the braking portion 622 is moved to the notch 6 as shown in FIG.
The rotation is stopped by contacting the inside of 41a.
In the above state, the brake lever 635 is
Pulling the brake band 644, the brake drum 63
1 rotation is cut off. Therefore, pulley 610
Of the motor 510 transmitted to the shaft 612
a, 612b (see FIG. 2) through the pulsator 400
To perform a washing or rinsing operation.

During the dewatering process, the drain valve 220 is opened by the operation of the drain motor (not shown), and at the same time, the clutch lever 620 is rotated as shown by the one-dot chain line in FIGS. 4 (a) and 4 (b). Let it. The rotation of the clutch lever 620 causes the braking portion 622 to move to the notch 641a.
Separated from the inner wall on one side. Also, the clutch lever 62
With 0, the brake lever 635 also rotates as shown by the dashed line, whereby the brake band 644 is rotated.
There is a gap at a predetermined interval between the brake drum 631 and the outer peripheral edge thereof. In such a state, the water tank 20
After all of the water in the cylinder 0 (see FIG. 1) is drained through the drain hose 222, the motor 510 operates and the pulley 610
Of the motor 510 transmitted to the brake drum 631 (see FIG. 2) via the elastic member 630,
Further, the power is supplied to the washing tub 30 through the connector 632.
0 is transmitted. Therefore, the washing tub 300 rotates at a high speed to perform the spin-drying process.

When the above dehydration process is interrupted,
When the power is turned off, the door of the washing machine is opened by the user to stop suddenly, or the user presses the pause button, the drain valve 220 is closed,
The clutch lever 620 and the brake lever 635 rotate to their original positions by the action of the elastic members 621a and 621b. That is, the brake band 644 is pulled to rotate to the position shown by the solid line in FIGS. 4A and 4B. Therefore, the rotation of the brake drum 631 is interrupted, whereby the rotation of the washing tub 300 is stopped.
At this time, as described above, the braking portion 622 of the clutch lever 620 comes into contact with the inside of the notch 641a, thereby restricting further rotation of the clutch lever 620 and the brake lever 635.

[0017]

However, in the conventional power transmission unit as described above, when the power is supplied to the drain motor at the end of the dewatering process or when the abrupt stop is performed during the dewatering process, power is supplied to the drain motor. The braking portion 622 is cut off by the elastic force of the elastic members 621a and 621b.
There is a problem that sharp metallic noise is generated by hitting one side inside 1a. Therefore, it has been a fundamental factor against the noise reduction of the target product of the washing machine.

Accordingly, the present invention has been made in view of the problems of the prior art, and generates metallic noise generated from a power transmission unit at the end of a spinning cycle of a washing machine or at the time of a sudden stop during the spinning cycle. It is an object of the present invention to provide a power transmission device for a washing machine that prevents the occurrence of the power transmission.

[0019]

In order to achieve the above object, a power transmission device for a washing machine according to the present invention comprises: first power transmission means for transmitting the power of a motor to a first rotating body of the washing machine; A second power transmission means for transmitting the power of the motor to the second rotating body; and a second power transmitting means for transmitting the power of the motor to the first rotating body.
In a power transmission device for a washing machine, comprising: clutch means for selectively transmitting power to a rotating body; and brake means for stopping the second power transmission means. In order to prevent the braking unit from directly abutting on the case member when the braking unit to be limited and the brake unit operates the brake,
A rectangular buffer provided on the braking portion, the buffer having a predetermined thickness and one side in a longitudinal direction being formed in an arc shape; and A first shock absorbing portion, which is a through hole formed in parallel with the braking portion on a side that comes into contact with the case member when the braking portion is actuated, First
A power transmission device for a washing machine, comprising: a second shock absorbing portion, which is a through hole formed in parallel with the braking portion, between the shock absorbing portion and the fastening portion.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

The power transmitting device for a washing machine according to the present invention includes a first power transmitting means for transmitting the power of the motor to a first rotating body of the washing machine, and a second power transmitting means for transmitting the power of the motor to a second rotating body. Transmitting means, clutch means for selectively transmitting the power of the motor to the first rotating body and the second rotating body, brake means for stopping the second power transmitting means, and the clutch means; A braking unit configured to limit the operation of the brake unit; and a buffer unit installed in the braking unit to prevent the brake unit from directly contacting a predetermined member when the brake is operated by the brake unit. You.

In the above configuration, the first power transmission means includes the shafts 612a and 612b and the transmission
14, and the second power transmission means is provided with an elastic member 6
30; a brake drum 631; and a connector 632. The clutch means includes a clutch lever 620 and an elastic member 621a. The brake means includes a brake lever 635, an elastic member 621b, and a brake band 6.
44. Further, the braking portion 622 has a shape in which one side of the clutch lever 620 is extended.

The damping member 10 is provided in the braking section 622. FIG. 5 is a perspective view showing a configuration of the cushioning member 10 provided in the braking unit 622 in the above-described device. FIG.
As shown in FIG. 5, the cushioning member 10 includes a fastening portion 11 formed for fastening to the braking portion 622, and a first shock absorbing portion 12 formed on a side that comes into contact with the case member 640 when the braking portion 622 operates. The first shock absorbing portion 12 and the fastening portion 11
And the second shock absorbing part 13 formed between them.

The cushioning member 10 is a rectangle having a predetermined thickness, and one side in the longitudinal direction is formed in an arc shape. The material of the cushioning member 10 is preferably made of a soft cushion material, but may be made of a hard rubber material that plays a role of a predetermined cushion.

The fastening portion 11 is formed in the same rectangle as the cross-sectional shape of the braking portion 622. Therefore, the buffer member 622 can be inserted into the fastening portion 11 to fix the cushioning member 10. Further, a circular or oval hole is formed in the first shock absorbing portion 12 and the second shock absorbing portion 13 so as to penetrate the buffer member 10 in a direction parallel to the braking portion 622.

In the above description, the thickness of the cushioning member 10 is constant, but it may be formed wider than the width of the portion in contact with the case member 640. Further, the holes of the first shock absorbing portion 12 and the second shock absorbing portion 13 can be formed in different shapes and sizes from each other.
It may be formed as one circular or oval or rectangular hole.

In the above embodiment, the braking portion 622 and the cushioning member 10 are described as separate components. However, the present invention is not limited to this, and a soft cushion material or a hard cushion material is integrally formed with the braking portion 622. Molding can also be performed.

Also, instead of the braking section 622, the braking section 62
The buffer member 10 may be attached to the inner wall of the notch 641a of the case member 640 that comes into contact with the second member. The braking unit 6
Buffer members may be provided in both the cutout 641a of the case member 640 and the case member 640.

Next, the operation and effects of the power transmission device according to the present invention configured as described above will be described. Here, since the operation of the power transmission device of the present invention is as described above, a specific description will be omitted, and only the operation as a feature of the present invention will be described. However, parts necessary for the description of the present invention will be described with reference to FIGS.

First, during the spin-drying process of the washing machine, as shown by a solid line in FIG. 6, the braking portion 622 to which the cushioning member 10 is attached is placed in a state of being separated from the cutout portion 641a of the case member 640. Therefore, the brake drum 6
Numeral 31 rotates the washing tub 400 by rotating at a high speed.

In this state, when the spin-drying process is completed or when the lid of the washing machine is opened, the brake band 644 squeezes the brake drum 631 and the washing tub 400
Stop the rotation of. At this time, the braking portion 622 separated from the inner wall of the notch 641a moves as shown by the dashed line in FIG. Is primarily absorbed by the first shock absorbing portion 12 of the cushioning member 10. Further, the remaining impact is secondarily absorbed by the second impact absorbing unit 13. Therefore, according to the present invention, no metallic noise is induced at the end of the dewatering process and at the time of sudden stop.

Although a more specific embodiment of the invention has been described, various modifications can be obviously made without departing from the scope of the invention. For example, in the above description, the case where the braking portion is formed integrally with the clutch lever and the rotation of the clutch lever is limited by the contact between the braking portion and the case member has been described. The position of the part to be formed is not limited thereto.

[0033]

As described above, according to the present invention, the first shock absorbing portion which is provided in the braking portion and has one side in the longitudinal direction formed in an arc shape is provided in parallel with the braking portion. The impact is primarily absorbed, and then the impact is secondarily absorbed by the second impact absorbing portion drilled in parallel with the braking portion. Thus, sharp metallic noise caused by the direct contact of the braking portion with the case member of the power transmission device can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal configuration of a normal washing machine.

FIG. 2 is a side sectional view partially cut away to specifically show a configuration of a power transmission unit in FIG. 1;

FIG. 3 is a partially enlarged view showing a main part of a power transmission unit of FIG. 2;

FIG. 4 is an operation state diagram of the power transmission device in FIGS. 1 to 3;

FIG. 5 is an enlarged perspective view showing a configuration of a main part in a power transmission device for a washing machine according to the present invention.

FIG. 6 is an operation state diagram of main parts of the power transmission device for a washing machine according to the present invention;

[Description of Signs] 10 Buffer means (buffer member) 11 Fastening part 12 First shock absorbing part 13 Second shock absorbing part 622 Braking part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 49/10 F16D 67/02

Claims (3)

(57) [Claims] A first power transmitting means for transmitting the power of the motor to a first rotating body of the washing machine; a second power transmitting means for transmitting the power of the motor to a second rotating body; A power transmission device for a washing machine, comprising: clutch means for selectively transmitting power to the first rotating body and the second rotating body; and brake means for stopping the second power transmitting means. A braking unit for restricting the operation of the clutch unit and the braking unit; and a rectangular buffer installed on the braking unit to prevent the braking unit from directly contacting the case member when the brake unit operates the brake. Means having a predetermined thickness, and one side in the longitudinal direction is formed in an arc shape, comprising: a buffering means, wherein the buffering means is formed for fastening with the braking part. Unit and the braking unit A first shock absorbing portion that is a penetrating hole formed in parallel with the braking portion on a side that comes into contact with the case member when moving, and the braking portion between the first shock absorbing portion and the fastening portion. A power transmission device for a washing machine, comprising: a second shock absorbing portion that is a through hole formed in parallel. 2. The power transmission device for a washing machine according to claim 1, wherein said buffer means is made of a soft cushion material. 3. The power transmission device for a washing machine according to claim 1, wherein said buffer means is made of a hard rubber material having a predetermined cushioning property.