KR20000075320A - A brake apparatus of washing machine - Google Patents

Abstract

PURPOSE: A brake device for a washing machine is provided to remove an abrasion of a brake lining by preventing the brake lining from making contact with a drum when a dehydrating process is being carried out. CONSTITUTION: A brake device for a washing machine comprises a brake shoe(251) and a brake lining(252). The brake shoe(251) is provided with cushion members(253). The cushion members(253) absorb the vibration when the vibration is transferred to the brake shoe(251) caused by the contact between the brake lining(252) and a drum when a washing process is carried out. The cushion members(253) allow the brake lining(252) to be separated from the drum when the dehydrating process is carried out. At least three cushion member(253) are arranged by regularly spaced apart from each other.

Description

Brake device for washing machine {A BRAKE APPARATUS OF WASHING MACHINE}

The present invention relates to a brake device for a washing machine, and more particularly, to a brake device for a washing machine having an improved structure such that the brake band is extended at a predetermined interval from the outer peripheral surface of the drum when the brake band releases the braking force of the drum.

In the conventional power transmission device for a washing machine, as shown in FIG. 1, the pulley 14 is fixed to the outer end of the drive shaft 10 by a nut 12 at the lower end thereof, and the outer circumference of the drive shaft 10. On the upper side of the pulley 14, the drive shaft coupling 16 is coupled by interference fit, and a plurality of bushes 18 are disposed on the upper side of the drive shaft coupling 16 with respect to the outer circumference of the drive shaft 10. Thus, the gear case 20 is freely installed.

A drum 22 is freely installed on the upper edge of the gear case 20, and a driven shaft coupling 24 is freely coupled to the upper inner circumferential surface of the drum 22 by serrations, and the driven shaft couples. The dehydration tank 28 is fixed to the upper end of the ring 24 via a plurality of bolts 26.

A driven shaft 32 is freely installed on the inner circumference of the driven shaft coupling 24 via a plurality of bushes 30, and an upper side of the dehydration tank 28 with respect to the outer circumference of the upper end of the driven shaft 32. The pulsator 36 is installed through the bolt 34, and the upper carrier 38 is freely coupled to the outer periphery of the driven shaft 32 by serration.

In addition, the sun gear 40 is fixed to the upper end of the drive shaft 10, a plurality of planetary gears 42, the outer periphery of the sun gear 40, the gear contact is freely rotated at a predetermined interval in the circumferential direction, respectively, the drum An internal gear 44 is formed on the lower inner circumference of the 22 so that the plurality of planetary gears 42 are freely in gear contact with each other.

Here, the plurality of planetary gears 42 are interposed between the upper carrier 38 and the lower carrier 46 and are freely connected to the deceleration rotation via the shaft 48, respectively.

The middle height with respect to the outer circumference of the gear case 20 is coupled via the lower inner circumference of the lower housing 50 and the ball bearing 52 fixed to the bottom outside of the washing tank (not shown), and of the gear case 20 One-way clutch bearing 54 is provided above the ball bearing 52 with respect to the outer circumference.

Here, the one-way clutch bearing 54 is fixed by the support member 58 via the bush 56 pressed into the outer circumference thereof, the edge of the support member 58 is a plurality of bolts (60) It is fixed to the lower housing 50.

On the other hand, the lower housing 50, the upper housing 68, which is fixed to the upper edge of the driven shaft coupling 24 via the ball bearing 66 on the upper side with respect to the outer periphery of the drum 22 It is fixed integrally, and the brake lever 70 is freely supported left and right by the lever shaft 72 and the lever spring 74 on the upper flange side 50a of the upper end, and the one side cutout 50b on the circumferential surface thereof. One end of the brake band 76 in contact with the outer circumference of the drum 22 is fixed.

Here, the brake band 76, one end is fixed to one side of the lower housing 50 through the cutout 50b, the other end is protruded to the outside through the cutout 50b to the brake lever It is hinged to 70.

In addition, the brake band 76, as shown in Figs. 2 and 3a, b, cutout portion 50b having one end formed in the lower housing 50 so as to surround the lower end of the outer peripheral surface of the drum 22. The brake shoe 76a is fixed to one side of the lower housing 50 and the other end protrudes through the cutout 50b to be hinged to the brake lever 70, and the brake shoe 76a. And a brake lining 76b attached to the inner surface of the drum to brake the drum 22 by friction with the outer circumferential surface of the drum 22 during washing or dehydration stopping.

A clutch spring 78 is installed on an upper circumference of the drive shaft coupling 16 and a lower outer circumference of the gear case 20, a clutch holder 80 is installed on an outer circumference of the clutch spring 78, and the clutch holder On the outer circumference of 80, a sleeve member 84 is provided via a brake ring 82.

At this time, one end of the clutch spring 78 is connected to the gear case 20, and the other end thereof is connected to the clutch holder 80.

A clutch lever 86 is installed at one side of the sleeve member 84, and one side of the clutch lever 86 is another lever shaft 72a and a lever spring supported at one side of the lower housing 50. 74a) is freely supported left and right.

In addition, the clutch lever 86 and the brake lever 70 are installed to be interlocked by a connecting lever 88 connected to the drain motor (not shown).

However, the brake device of the conventional washing machine configured as described above is reduced inwardly so that the brake shoe 76a and the brake lining 76b are braked inward to brake the drum 22 during washing or dehydration stopping. When the brake lining 76b and the drum 22 come into contact with each other, the contact vibration transmitted to the brake shoe 76a through the brake lining 76b is not attenuated, but rather amplified in the brake shoe 76a to reduce the quality. There was a problem.

In the dehydration course, when the brake shoe 76a and the brake lining 76b are extended outwardly so as to be spaced apart from the drum 22, the brake shoes 76a and the brake lining 76b cannot be spaced at uniform intervals and are biased to one side as shown in FIG. 3B. A part of the 76b is in contact with the drum 22 to cause contact noise, and at the same time there is a problem of causing uneven wear of the brake lining 76b.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to attenuate the vibration when the contact vibration generated by the contact between the brake lining and the drum during washing course or dehydration stop course is transmitted to the brake shoe In addition, when the brake shoe and the brake lining are separated from the drum during the dehydration course, the brake device of the washing machine is removed so that a part of the brake lining does not come into contact with the drum, eliminating contact noise and eliminating uneven wear of the brake lining. To provide.

1 is a side cross-sectional view showing a power transmission device of a conventional washing machine;

Figure 2 is a perspective view of a conventional brake band,

Figure 3a is a plan sectional view showing a state in which the brake band is extended from the drum when washing or dehydration stop in the prior art;

Figure 3b is a plan sectional view showing a state in which the brake band is reduced in contact with the drum during the conventional dewatering;

4 is a perspective view showing a coupled state of the brake unit according to the present invention;

5 is an exploded perspective view showing a brake unit according to the present invention;

Figure 6 is a plan view showing a state in which the brake band wound on the drum when washing according to the present invention,

7 is a plan view showing a state in which the brake band is released from the drum when dewatering according to the present invention.

Explanation of symbols on the main parts of the drawings

22: drum 50: lower housing

251: brake shoe 252: brake lining

253: cushion member

The brake device of the washing machine according to the present invention made to achieve the above object is provided between the lower housing and the drum to brake the rotation of the drum or to separate the brake shoe and brake lining to free the rotation of the drum. In the brake device of the washing machine having a washing machine, the brake shoe absorbs and attenuates the vibration generated by the contact between the brake lining and the drum during the washing course and the dehydration stop course when the brake shoe is transferred to the brake shoe. And a cushion member which is divided at least in three directions at an interval with respect to an outer surface thereof so that the brake shoe and the brake lining are spaced apart from the drum so as to extend at a uniform interval so that the brake lining and the drum do not contact each other. It is done.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 7.

For reference, the same name and same reference numerals are given to the same configurations as the present invention and the conventional configuration, and detailed description thereof will be omitted.

The brake apparatus of the washing machine according to the present invention includes a lever shaft 210 vertically coupled to one side with respect to the upper housing 68 and the lower housing 50, and the upper housing 68 and the lower housing ( The brake lever 220 freely coupled to the outer circumference of the lever shaft 210 so as to be positioned between the brake shaft 220 and the brake lever 220 between the upper housing 68 and the lower housing 50. A first elastic member 230 wound around the outer circumference of the lever shaft 210 so as to be positioned at an upper side of the 220, and having one end connected to the upper housing 68 and the other end connected to the brake lever 220, and the drum 22. The outer circumferential surface of the circumferential surface and both ends are composed of brake bands 250 hinged by the first and second hinge pins 240 and 241 at two locations at a predetermined distance from the rotation center of the brake lever 220. .

That is, the lever shaft 210 has an upper end coupled to one side with respect to the edge of the upper housing 68, and a lower end thereof protrudes downward through one side with respect to the edge of the lower housing 50. .

The brake lever 220, the cross-sectional shape is formed of a deflected angle so that both ends of the brake band 250 is inserted into a predetermined depth in the lateral direction, the lever shaft 210 is vertical in the upper and lower sides of one side end. The shaft hole 221 is formed so as to rotate freely, and the first and second hinge pins 240 and 241 are provided on the front side and the rear side maintaining a predetermined distance from the center of the shaft hole 221 with respect to the upper and lower surfaces of one side thereof. First and second support holes 222 and 223 are formed to be hinged and inserted in the vertical direction, respectively.

At this time, the installation distance of the first hinge pin 240 and the second hinge pin 241, as shown in Figure 6, the lever shaft 210 in the condition that the drum 22 is rotated in the P direction during the dehydration course The distance (L1) between the center of the center and the center of the first hinge pin 240 is greater than the distance (L2) between the center of the lever shaft 210 and the center of the second hinge pin (241).

The brake band 250 surrounds the outer circumferential surface of the drum 22 and both ends of the first and second hinges on the brake lever 70 through cutouts 50b formed in the lower housing 50. A brake shoe 251 having hinge holes 251a and 251b formed at both ends thereof so as to be hinged so as to be pivotable through the pins 240 and 241, and attached to an inner surface of the brake shoe 251 to be washed or dehydrated. Brake lining 252 for braking drum 22 by friction with outer circumferential surface of cosplay drum 22, and attached to predetermined position on outer surface of brake shoe 251 to wash laundry course and dehydration stop cosiness brake lining 252 Attenuates the vibration when the contact vibration generated by the contact between the drum and the drum 22 is transmitted to the brake shoe 251. In addition, the brake shoe 251 and the brake lining 252 are removed from the drum 22 in the course of dehydration. Extended brake at even intervals when spaced apart Part of the dining 252. This is composed of a plurality of cushion members (253) to prevent contact with the drum 22.

In this case, the plurality of cushion members 253 are divided and attached to at least three directions at an interval with a predetermined interval within an area for pressing the outer circumference of the drum 22 against the outer surface of the brake shoe 251. do.

Next, the operation and effect of the present invention configured as described above will be described.

First, when a washing course is selected for rotation of a pulsator (not shown), the brake unit is operated by receiving power from a drain motor (not shown).

That is, when the brake lever 220 is rotated by a predetermined angle in one direction (counterclockwise direction) with the lever shaft 210 as the rotation center as shown in FIG. 6, the brake lever 220 is first and second in two places. Both ends of the brake shoe 251 hinged by the second hinge pins 240 and 241 are pulled in different directions, so that the brake shoe 251 and the brake lining 252 strongly strengthen the outer circumferential surface of the drum 22. Pressure.

The reason for this is that both the first hinge pin 240 and the second hinge pin 241 face each other with respect to the two places of the brake lever 220 with respect to the lever shaft 210 as shown in FIG. Since both ends of the brake shoe 251 are respectively connected to the predetermined distances L1 and L2, and the first and second hinge pins 240 and 241 are connected to each other, the brake lever 220 is disposed during the washing course. When rotated, the first hinge pin 240 and the second hinge pin 241 are rotated in the same direction (counterclockwise) with the lever shaft 210 interposed therebetween, so that the first hinge pin 240 is the brake shoe 251. ), One end of the drum 22 is pulled in one direction (counterclockwise) with respect to the drum 22, and the second hinge pin 241 makes the other end of the brake shoe 251 the other direction with respect to the drum 22 in the other direction (clockwise). Pulled.

In addition, the drum 22 may include the brake lining 252 attached to the inner surface of the brake shoe 251 by a force in which both ends of the brake shoe 251 are pulled in opposite directions with each other in a state in which a separate braking device is excluded. The force which is in contact and brakes in both directions is braked. In particular, as shown in FIG. 6, the distance L1 between the center of the lever shaft 210 and the center of the first hinge pin 240 in a state in which the drum 22 is rotated only in the P direction during the spin-drying process. ) Is set to be larger than the distance L2 between the center of the lever shaft 210 and the center of the second hinge pin 241, the end side of the brake lining 252 connected to the second hinge pin 241 is Since more contact with the drum 22, the braking force to rotate in the opposite direction than the force to rotate the drum 22 in the P direction during the washing course can be significantly increased.

At this time, the outer surface of the brake shoe 251 has a plurality of cushion members 253 distributed at predetermined intervals at predetermined positions in contact with the brake lining 252 and the drum 22 during the washing course or the dehydration stopping course. When the contact vibration generated by the transmission to the brake shoe 251 is absorbed to minimize the vibration.

On the other hand, if the dewatering course is selected for rotation of the pulsator and the dehydration tank (not shown), the brake lever 220 is predetermined in the opposite direction (clockwise) with the lever shaft 210 as the rotation center as shown in FIG. When rotated by an angle, both ends of the brake shoe 251 hinged to the two places of the brake lever 220 by the first and second hinge pins 240 and 241 are released in different directions, and thus the brake shoe 251. ) And the brake lining 252 is expanded and at the same time spaced apart from the outer peripheral surface of the drum 22 to form a constant gap, the drum 22 is free to rotate.

That is, when the brake lever 220 is rotated, the first hinge pin 240 and the second hinge pin 241 are rotated in the same direction with the lever shaft 210 interposed therebetween, so that the first hinge pin 240 brakes. One end of the shoe 251 is pushed in one direction (clockwise) with respect to the drum 22, and the second hinge pin 241 moves the other end of the brake shoe 251 in the other direction with respect to the drum 22. By a clockwise direction), a braking force is lost as a gap is generated between the brake lining 252 and the outer circumferential surface of the drum 22.

At this time, the outer surface of the brake shoe 251 has a plurality of cushion members 253 distributed at predetermined intervals at a predetermined position when the brake shoe 251 and the brake lining 252 are spaced apart from the drum 22 during the dehydration course. While in contact with the inner circumferential surface of the lower housing 50, respectively, the extension range of the brake shoe 251 and the brake lining 252 is adjusted.

That is, as shown in FIG. 7, the plurality of cushion members 253 cover the entire gap so that the side between the brake shoe 251 and the lower housing 50 does not deviate to one side when contacted with the lower housing 50, respectively. The gap between the brake lining 252 and the drum 22 is maintained by maintaining the entire gap at a uniform interval so as not to be biased between the brake lining 252 and the drum 22 and to one side. Contact is prevented in advance, thereby preventing a part of the brake lining 252 from being in contact with the drum 22, which is rotated at high speed during the dehydration course, and uneven wear.

As described above, the brake device of the washing machine according to the present invention has a structure in which a plurality of cushion members are distributed at predetermined positions on the outer surface of the brake shoe at predetermined intervals, so that the brakes are washed during washing or dehydrating stopping. When the contact vibration generated by the contact between the lining and the drum is transmitted to the brake shoe, the vibration can be attenuated by the cushion member, and when the brake shoe and the brake lining are separated from the drum during dehydration, the cushion member is formed on the inner peripheral surface of the lower housing. By maintaining the entire gap between the brake lining and the drum at uniform intervals, the contact between the brake lining and the drum is eliminated, thereby preventing contact noises and preventing uneven wear of the brake lining. It works.

Claims (3)

The brake shoe 251 and the brake are installed between the lower housing 50 and the drum 22 to brake the rotation of the drum 22 or to be spaced apart from the drum 22 to free the rotation of the drum 22. In the brake device of the washing machine having a lining 252, The brake shoe 251 absorbs and attenuates the vibration generated by the contact between the brake lining 252 and the drum 22 in the washing course and the dehydration stopping course when it is transmitted to the brake shoe 251. When the brake shoe 251 and the brake lining 252 are spaced apart from the drum 22 in the dehydration course, the brake shoe 251 and the brake lining 252 are extended at a uniform interval so that the brake lining 252 and the drum 22 do not contact each other. A brake device for a washing machine comprising a cushion member 253 which is divided and disposed at an angle of at least three directions at intervals. The method of claim 1, The cushion member 253, the breaker of the washing machine, characterized in that to maintain a certain distance so as not to contact the lower housing 50 during the washing course and dehydration stop course. The method of claim 1, The cushion member 253 is in contact with the lower housing 50 during the course of dehydration, the brake device of the washing machine, characterized in that to maintain a uniform distance between the brake lining (252) and the drum (22).