KR100370013B1 - driving shaft for washing machine - Google Patents

Abstract

The present invention relates to a drive shaft of a washing machine, characterized in that the drive shaft is configured separately from the first drive shaft and the second drive shaft having different material properties in consideration of the contact with the wash water. That is, the upper end of the drive shaft which is in contact with the wash water is made of stainless steel, and the part without contact with the wash water is made of steel, thereby saving expensive stainless materials and facilitating processing. The upper end of the drive shaft that makes contact is made of hollow shaft and then filled with resin to reinforce the strength. Therefore, it is possible to save the material by manufacturing the drive shaft to strengthen the strength and to prevent the leakage of the wash water to the lower part of the drive shaft. At the same time, there is an effect that can improve the reliability of the product.

Description

Driving shaft for washing machine

The present invention relates to a washing machine, and more particularly to a drive shaft of the washing machine.

In general, a washing machine includes a water storage tank for storing wash water, a washing tank rotatably installed in the water storage tank, a motor for rotating the washing tank, and a drive shaft for transmitting the rotational force of the motor to the washing tank. Therefore, the washing and dehydration administration is performed.

1 is a cross-sectional view of a conventional automatic washing machine driving unit as described above, referring to the configuration of a general washing machine as follows. Storage tank (1) and the washing tank (2), the hub (3) fastened to the bottom surface of the washing tank (2) in order to distribute the rotational force of the drive shaft (S) to the washing tank, and a pair of bearings (6, 7) and a bearing housing 8, and a motor M composed of a rotor 9 and a stator 10 for rotating the drive shaft S.

At this time, the drive shaft is a device for transmitting the rotational force of the motor to the washing tank, the specific structure of which is shown in FIG.

That is, the lower end of the drive shaft (S) is formed with a lower nut fastening portion 41 for fastening with the rotor, the rotor is positioned in the lower nut fastening portion 41 and then fixed with a bolt. The first serration part 42 is formed on the upper part of the lower nut fastening part 41 so that the rotor can be easily fastened to the drive shaft and configured to accurately transmit the rotational force of the motor. An upper nut fastening portion 53 for fastening the drive shaft to the hub is formed at an upper portion of the drive shaft S so that the hub is inserted into the upper nut fastening portion 53 and fastened with a bolt at the upper end thereof. A second serration part 52 is formed below the upper nut fastening part 53 to accurately transmit the rotational force of the drive shaft to the hub 3. In addition, the drive shaft (S) is supported by a pair of bearings, the lower bearing support stepped 43 for supporting the inner ring of the lower bearing 6, and the upper bearing for supporting the inner ring of the upper bearing (7) A step 51 is formed to support the drive shaft S. In order to support / fix each bearing, a bearing housing 8 is provided to couple the drive shaft S and the bearing to the bottom surface of the reservoir 1.

At this time, the drive shaft (S) is expected to be corrosion due to contact with the wash water is made of a stainless alloy, and manufactured by cutting a cylindrical material of about 35mm in diameter, 300mm in length, expensive stainless material The material cost was increased, and a large amount of stainless material was wasted in cutting, and there was a difficulty in processing.

The present invention has been made to solve the above-mentioned problems. Firstly, an object of the present invention is to reduce the production cost of manufacturing a drive shaft by reducing the amount of expensive stainless material.

It is another object of the present invention to provide a drive shaft of a washing machine which solves the processing difficulties resulting from casting / cutting of a stainless alloy material.

1 is a cross-sectional view of a typical washing machine drive unit

2 is a perspective view of a general washing machine drive shaft

3 is a sectional view of a first embodiment according to the present invention;

4 is a longitudinal sectional view showing a second embodiment according to the present invention;

5 is a longitudinal sectional view showing a third embodiment according to the present invention;

6 is a longitudinal sectional view showing a fourth embodiment according to the present invention;

<Explanation of symbols for the main parts of the drawings>

4: first drive shaft 5: second drive shaft 6: reinforcing member

The present invention has been made in order to solve the above-mentioned conventional problems, it will be described in more detail with reference to Figures 3 to 6 attached to each embodiment of the present invention.

3 is a cross-sectional view showing the structure of a drive shaft according to the first embodiment of the present invention.

That is, since it is located at the bottom of the reservoir (3), the first drive shaft (4) for the portion that is not in contact with the wash water in the reservoir (3), and the portion (E) extending to the top of the reservoir exposed to the wash water in the reservoir The second drive shaft (5) for the separate manufacture to use them.

The first drive shaft is made of steel, which is relatively inexpensive and easy to process, and the second drive shaft is made of a stainless alloy material, and a forced press with the second drive shaft 5 is formed on the first drive shaft. In order to form the protrusion 44, the second drive shaft is formed with a recess 44a into which the protrusion can be inserted. Most preferably, the outer diameter ø1 of the protrusion 44 is greater than or equal to the inner diameter of the recess 44a of the second drive shaft, and the protrusion of the first drive shaft is forcedly integrated into the second drive shaft. However, it is also possible to engage or screw by pin.

Such a configuration can reduce the phase of the stainless steel material for manufacturing the drive shaft by 1/2 phase, and the first drive shaft using steel instead of the stainless material can be easily processed such as cutting.

4 is a cross-sectional view of the second embodiment according to the present invention for further saving the stainless material in the above-described first embodiment.

In fact, if the shaft is made of materials of the same strength and the same rigidity, it was conceived that the hollow shaft can withstand much greater rotational force.

That is, the second drive shaft is formed of a hollow shaft, and the protrusion 44 of the first drive shaft is forcibly pressed into the second drive shaft in the same manner as in the first embodiment, and the reinforcement member made of resin is formed in the space formed on the second drive shaft. By injecting (6) so that the wash water does not come into contact with the upper portion of the first drive shaft, and to reinforce the strength according to the formation of the space portion, much material can be reduced in manufacturing the second drive shaft.

The second embodiment described above has the advantage of reducing the stainless material compared to the first embodiment, but the problem of deformation of the resin reinforcement material 6 when using high temperature wash water or winter cold wash water. There is a concern that this may cause the wash water to penetrate between the resin filler and the inner diameter of the second drive shaft made of stainless steel to corrode the first drive shaft made of steel.

Accordingly, FIG. 5 shows a third embodiment according to the present invention, which is devised to solve the expected problem.

That is, the upper part of the hollow second drive shaft is sealed, and resin is filled into the space portion of the second drive shaft, and then the washing water is pressed into the first drive shaft while the filled resin is cooled, so that the washing water is filled with the resin material. The deformation prevents leakage due to the gap between the inner diameter of the second drive shaft and the filler. In this way, corrosion of the first drive shaft can be prevented.

FIG. 6 illustrates a fourth embodiment of the present invention. In the case where the resin is filled in the cylindrical second drive shaft, when the amount of the resin filled therein is excessively large, the protrusion of the first drive shaft may be inserted. In order to solve the problem that it is difficult to completely indent the first drive shaft and the second drive shaft due to insufficient space, a barrier wall 7 is formed in the second drive shaft to fill resin thereon. In the lower part, the first drive shaft was formed to be press-fitted.

That is, the protrusion of the protrusion of the first drive shaft and the portion of the resin filled are divided so that the process of press-fitting the protrusion of the first drive shaft is not influenced by the filling amount of the resin, and the wash water has an inner diameter of the second drive shaft and the resin material. Even if the leakage occurs between the filling portion of the steel material is configured not to be transmitted to the first drive shaft.

As described above, the driving shaft of the washing machine according to the present invention can reduce the production cost by significantly reducing the amount of expensive stainless material used. In addition, by using a steel material that is relatively easy to process the first drive shaft, it is possible to facilitate operations such as cutting, pressing and casting.

Claims (6)

A cylindrical reservoir for storing wash water for washing clothes, a washing tank rotatably installed in the reservoir, a driving motor for driving the washing tank, and a driving shaft for transmitting rotational force of the driving motor to the washing tank. In the washing machine to say, The drive shaft is A first driving shaft receiving a rotational force of the driving motor primarily and having a protrusion formed thereon for coupling with a second driving shaft thereon; It is installed inside the hollow shaft and the hollow shaft to prevent leakage to the first drive shaft and to reinforce the strength of the shaft, the first drive shaft by pressing the projection of the first drive shaft is forced to be coupled to the lower lower shaft Rotating integrally with the drive shaft of the washing machine comprising a second drive shaft made of a corrosion-resistant material. delete delete The method of claim 1, The second drive shaft, Hollow shaft, A blocking wall formed inside the hollow shaft, Drive shaft of the washing machine comprising a reinforcing material installed on the top of the blocking wall. The method of claim 1 The hollow drive shaft of the washing machine, characterized in that the upper portion is sealed. The method according to claim 1 or 4, The reinforcing material is a drive shaft of the washing machine, characterized in that made of a resin material.