KR19990033957A - Surface treatment method of washing drum for washing machine - Google Patents

Abstract

Surface treatment method of a brake drum for a washing machine according to the present invention is a washing machine having a brake drum in close contact with the brake lining of the brake band to stop the rotation of the dehydration tank during dehydration stop or washing, the outer peripheral surface of the brake drum Since the brake lining is closely adhered to each other, the ceramic is coated to suppress noise due to friction slip while giving a uniform braking force, thereby preventing surface damage of the brake drum due to corrosion resistance and abrasion resistance. The brake torque can be lowered during use or long-term use to eliminate friction slip noise and prevent rust from occurring even in a place where the operating environment of the washing machine is high in moisture.

Description

Surface treatment method of washing drum for washing machine

The present invention relates to a brake drum of a washing machine, and more particularly, to a surface treatment method of a brake drum for a washing machine in which surface treatment of a brake drum in contact with the brake band improves the characteristics of the brake to suppress noise.

In the conventional washing machine, as shown in FIGS. 1 to 3, a dehydration tank 6 is rotatably installed inside the washing tank 2 installed in the washing machine, and inside the dewatering tank 6 when washing. Stirring means 7 for stirring the laundry therein is provided.

The lower part of the washing tank 2 is provided with driving means for binding and driving in the center of the dehydration tank (6) and the stirring means (7).

That is, the driving means is a power generating means (10) for rotating the drive shaft 20 by the power applied to the lower end of the washing tank (2), and the driven shaft (21) by reducing the rotation of the drive shaft (20) during washing Decelerating means (30) installed on the upper portion of the power generating means (10) to transmit to the power generating means (10) and deceleration means (30) to disconnect and connect the power transmitted to the driven shaft (21). It consists of a power switching means 40 installed between.

Here, the power generating means 10 is composed of a stator 11 to form a magnetic field by the applied power, and a rotor 12 to rotate by the magnetic field formed on the stator (11).

At this time, the ball bearing 13 is inserted into the upper and lower parts of the stator 11 and the rotor 12 by the fastening member 99 and the rotation of the drive shaft 20 is smoothly inserted into each of the central parts thereof. Upper and lower housings 14 and 15 are provided.

The reduction means 30 has an internal gear 31 having teeth formed on an inner circumferential surface thereof, a plurality of planetary gears 32 installed therein so as to rotate in engagement with teeth of the internal gear 31, and the plurality of planetary gears 32. It was composed of a carrier 33 connecting the central axis (32a) of.

In addition, the brake drum 34 and the connector 35 are rotatably installed on the outside of the deceleration means 30 via a bushing 98 inserted into the inner circumference of the driven shaft 21 and the driving shaft 20. On the lower outer peripheral surface of the connector 35 is provided a lower case 37 in which a ball bearing 36 is press-fitted, and an upper side of the lower case 37 between the upper outer peripheral surface of the brake drum 34 and the lower case 37. The upper case 38 to which the ball bearing 36 is press-fitted is attached.

The power switching means 40 has a brake band (42) installed on the outer circumference of the brake drum (34) so as to release the binding force holding the brake drum (34) when the brake lever (41) is operated. One side is hinged to the support bracket 43 standing on the housing 14 and the other side of the roller lever 44 is coupled to the clutch lever 45 and the toothed movement to the lower end of the connector 35, the tooth is rotated The upper clutch 47 and the inner clutch of the upper clutch 47 which are coupled to each other and are coupled to the clutch lever 45 to move up and down by the seesaw movement of the lower clutch 46 and the lower clutch 46 at the lower end and engage with the power. It is installed in the spring is compressed by the operation of the clutch lever 45 in the washing and the dehydration in the spring 48 is acting to engage the lower clutch 46 while lowering the upper clutch 47.

At this time, the surface (outer circumferential surface) of the brake drum 34 is made of a dark coating (Dacro; Al-Cr powder coating) or Z to be in close contact with the brake lining 42a attached to the inner surface of the brake band 42. The surface treatment surface 34a is formed by coating (Zn powder coating).

However, the conventional method for treating the surface of a brake drum for a washing machine configured as described above has a well known anti-corrosion effect on the surface of the brake drum 34 and is well known to have a dark coating or Z-coating treatment to suppress rust. Here, the dark coating has a weak peeling strength, so that the surface-treated surface 34a is peeled off early, and the coated powder is braked as it is attached to the surface of the brake lining 42a without being leaked out of the brake band 42. When the coating powder and the brake drum 34 are deformed to be in contact with each other, the braking performance is not uniform, which may be a fatal defect in the development of a large-capacity washing machine and high-speed dehydration.

In particular, when the coated brake drum 34 is initially used, there is no friction slip noise generated when the surface treatment surface 34a and the brake lining 42a of the brake drum 34 come into contact with each other. The surface is easily damaged due to lack of corrosion resistance and abrasion resistance, and the friction coefficient is changed, and the winding angle of the band, which is the characteristic of the brake band 42, is increased due to the rapid change of the friction coefficient, thereby increasing the brake torque and frictional slip. There is a problem that the noise is generated, because rust occurs easily because the operating environment of the washing machine is a lot of water.

Accordingly, the present invention has been made to solve the above problems, the object of the present invention is to surface the brake drum to maintain the inherent characteristics of the friction material for a stable braking force, the brake drum due to corrosion resistance and wear resistance Washing machine brake that prevents surface damage in advance, reduces brake torque during initial use of brake drum or long-term use, eliminates friction slip noise and prevents rust from occurring even when the operating diameter of the washing machine is high. It is to provide a surface treatment method of a drum.

Surface treatment method for a brake drum for a washing machine according to the present invention made to achieve the above object, in the washing machine having a brake drum in close contact with the brake lining of the brake band to stop the rotation of the dehydration tank during dehydration stop or washing. In the outer peripheral surface of the brake drum is characterized in that the ceramic is coated so that the brake lining is in close contact with each other to give a uniform braking force while suppressing noise due to friction slip.

1 is a longitudinal sectional view showing a driving device at the time of conventional washing;

2 is a plan view illustrating an operation state of a conventional brake drum;

3 is a cross-sectional view showing a conventional brake drum,

4 is a cross-sectional view illustrating a state in which the brake drum according to the present invention is surface treated.

* Explanation of symbols for main parts of the drawings

34: brake drum 34b: uneven surface

42: brake band 42a: brake lining

100: ceramic

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

For reference, the same configuration and the same reference numerals are used for the same configuration as the conventional configuration, and detailed description thereof will be omitted.

As shown in FIG. 4, the brake lining 42a adheres to the inner surface of the brake band 42 when dehydrating stops or washes on the surface of the brake drum 34 so as to provide a uniform braking force and friction. Ceramic 100 is coated to suppress noise due to slip.

At this time, the roughness (surface roughness) of the ceramic drum 100 is easily coated on the outer circumferential surface of the brake drum 34 by a shot blasting or a grit blasting method so that the ceramic 100 is easily coated. A concave surface 34b having -20S is formed.

As described above, when the ceramic drum 100 is coated on the brake drum 34, the surface hardness is maintained at about 500 Hv or less by a conventional heat treatment method (for example, gas soft nitriding or salt bath nitriding). (100) The surface hardness after coating is increased to about 800 Hv or more, so even after long-term use, the wear resistant surface can be continuously maintained during the initial coating treatment.

In addition, since the ceramic 100 is a nitride, there is an advantage that corrosion and rust do not occur, and it is not necessary to undergo a separate heat treatment process after being coated on the brake drum 34, thereby reducing the number of processes and reducing the cost. Can be saved.

As described above, according to the surface treatment method of the brake drum for a washing machine according to the present invention, since the outer peripheral surface of the brake drum is coated with ceramic, the brake drum is prevented by preventing the surface damage of the brake drum due to corrosion resistance and abrasion resistance. When the initial use or long-term use of the brake torque is lowered to eliminate the friction slip noise and at the same time there is an effect that the rust does not occur even in the absence of moisture in the operating environment.

Claims (3)

In a washing machine having a brake drum that is in close contact with the brake lining of the brake band to stop the rotation of the dehydration tank when dehydration stop or washing, the brake lining is in close contact with the outer circumferential surface of the brake drum to give a uniform braking force and friction Surface treatment method for a brake drum for a washing machine, characterized in that the ceramic is coated to suppress the noise caused by slip. The surface treatment method of a brake drum for a washing machine according to claim 1, wherein an uneven surface is formed on an outer circumferential surface of the brake drum so that the ceramic is easily coated to form a close contact. 3. The surface treatment method of a brake drum for a washing machine according to claim 2, wherein the uneven surface is formed by any one selected from shot blasting or grit blasting.