KR100469250B1 - structure for insulating vibration in the driving part of washing machine - Google Patents

Abstract

The present invention relates to a dustproof structure of a washing machine driving unit to reduce the transmission of vibration generated in the rotation of the driving unit to the outer tank.

To this end, the present invention is installed in the center of rotation of the rotor housing 53, the rotor bushing 54 is formed in the center of the circular bushing hole (54b); A bracket 55 installed below the rotor bushing 54 and having a hole formed at a center thereof; An anti-vibration fastening means for fixing the rotor bushing 54 and the bracket 55 to the rotor housing 53 and buffering the vibration generated when the rotor 52 rotates; It is rotatably inserted into the bushing hole (54b) of the rotor bushing (54), is inserted and installed to restrain the hole of the bracket 55, the rotational force of the rotor (52) is transmitted by the bracket (55) Lower washing shaft 58: to provide a dustproof structure of the washing machine drive unit.

Description

Structure for insulating vibration in the driving part of washing machine

The present invention relates to a washing machine, and more particularly, to a dustproof structure of the washing machine driving unit to prevent the vibration generated during the rotation of the driving unit to be transmitted to the outer tank.

A general washing machine is a household appliance that washes laundry by the flow of the washing water generated by forced flow of the supplied washing water and friction and emulsification of the detergent. The washing process of the washing machine is usually performed by washing, rinsing, dehydrating and It consists of a drainage process.

The washing machine is fixedly installed in the outer tank for receiving the wash water in the cabinet forming the outer shape, the inner tank in which the laundry is contained is rotatably installed, the drive unit is installed to rotate the inner tank lower portion of the outer tank.

Hereinafter, the driving unit of the conventional washing machine will be described with reference to FIGS. 1 and 2.

1 is a block diagram showing a structure of a driving unit of a conventional washing machine, and FIG. 2 is a cross-sectional view of the rotor bushing and the shaft of FIG. 1 taken along the line I-I.

Referring to FIG. 1, a tub base 12 is fixed to a lower end of the outer tub 11 to support a lower end of the tub, and a bearing housing 13 is fixed to a lower portion of the tub base.

A stator 15 is installed below the bearing housing 13, and a rotor 16 is rotatably installed on the outside of the stator, and the rotor housing 17 is configured to surround the outside of the rotor. It is fixed to the installation.

The rotor 16 is installed to be spaced apart from the outside of the stator 15 by a predetermined interval, the rotor 16 is rotated by the magnetic field formed in the stator 15, the rotor housing is also rotated together with the rotor. At this time, the gap between the stator 15 and the rotor 16 is generally maintained about 0.5 mm.

The rotor bushing 18 is installed at the center of the rotor housing 17, and the lower end of the lower washing shaft 21 is inserted into the rotor bushing. At this time, a polygonal face tooth 21a is formed on the outer peripheral surface of the lower end of the lower washing shaft 21, and a rotor bushing 18 is joined to the face tooth portion 21a to form the rotor 16. It has a structure that can transmit the rotational force to the lower washing shaft (21).

A reducer 22 is installed at an upper end of the lower laundry shaft 21, an upper washing shaft 23 is connected to the reducer 22, and a pulsator (not shown) is connected to an upper end of the upper laundry shaft. At this time, the reducer 22 is installed to engage with the teeth (not shown) installed in the upper end of the lower washing shaft and the lower end of the upper washing shaft.

The upper washing shaft 23, the reducer 22 and the lower washing shaft 21 are rotatably installed in the dehydration shaft 25, the inner tank (not shown) is fixed to the upper end of the dehydration shaft 25 do. In addition, the lower end of the dehydration shaft 25 is installed to be spaced apart from the upper surface of the rotor bushing (18) by a predetermined interval. At this time, the rotor bushing 18 is fixed to the rotor housing 17 by a fastening member 19.

On the other hand, the serrated serration portion 18a (serration) is formed on the outer peripheral surface of the lower end of the dehydration shaft 25 and the upper peripheral surface of the rotor bushing 18 as shown in FIG. 2, and the dehydration shaft 25 and the rotor bushing are formed. Coupling 26 is provided in the serration portion 18a of 18 so as to be movable up and down. A bearing 14 is installed between the dehydration shaft 25, the tub base 12, and the bearing housing 13 to allow the dehydration shaft 25 to rotate smoothly.

Due to this structure, the coupling 26 moves upward to restrain the dehydration shaft 25 so that only the washing shaft is rotated, or moves downward so that the rotational force of the rotor 16 is washed with the dehydration shaft 25. It is transmitted to the shaft (21, 23) so that the dehydration shaft and the washing shaft is rotated at the same time.

Such a washing machine driving unit has a structure in which the rotational force of the rotor 16 is transmitted to the washing shafts 21 and 23 or the dewatering shaft 25 by the rotor bushing 18.

The operation of the driving unit of the washing machine is described as follows.

When the washing operation starts after the laundry and the washing water are supplied to the inner tank, a magnetic field is generated in the stator as power is applied to the stator 15, and the rotor 16 is rotated by the magnetic field of the stator 15. Let's do it.

The rotational force of the rotor 16 is transmitted to the rotor bushing 18 through the rotor housing 17, and the rotational force transmitted to the rotor bushing is transmitted to the lower washing shaft 21. At this time, the coupling 26 is moved upward so that the projection of the coupling is caught in the groove of the bearing housing 13, so that the rotational force of the rotor 16 is transmitted only to the lower washing shaft 21.

The rotational speed of the lower washing shaft 21 is decelerated at a constant reduction ratio in the reducer 22, and the upper washing shaft and the pulsator are rotated at a reduced speed to perform the washing stroke.

After the washing stroke is completed, a rinsing stroke is performed, and when the rinsing stroke is completed, a dehydration stroke is performed to minimize the moisture contained in the laundry.

In the dehydration stroke, the coupling 26 is moved downward to be coupled to the serration portion 18a formed at the lower end of the dehydration shaft 25 and the upper end of the rotor bushing 18.

Accordingly, since the rotational force of the rotor 16 is transmitted to the washing shafts 21 and 23 and the dehydration shaft 25, the pulsator connected to the washing shaft and the inner tub connected to the dewatering shaft are simultaneously rotated at high speed.

The laundry is washed through the washing stroke, the rinsing stroke and the dehydrating stroke, and recently, the drying stroke is additionally added after the dehydrating stroke.

However, the driving unit of the washing machine forms a face tooth 21a on the outer peripheral surface of the lower end of the lower washing shaft 21, and the rotor bushing 18 is joined to the face tooth 21a, so that the rotational force of the rotor 16 is rotated. The bushing 18 has a structure that is directly transmitted to the laundry shaft and dewatering shaft. Therefore, there is a problem in that the vibration generated when the rotor rotates is directly transmitted to the outer tub 11 to increase the noise.

In addition, the general rotor is not operated at a constant rotational speed during rotation, the rotational speed is changed within a certain range, the ripple phenomenon of the washing shaft is shaken due to such a change in the rotational speed, generated by the ripple phenomenon There is a problem that the vibration is transmitted to the outer tank.

For example, when the rotor is set to rotate at 850 rpm, the vibration due to the ripple phenomenon is directly transmitted to the outer tank while rotating within a range of about 840 to 860 rpm.

Accordingly, the vibration generated when the rotor is rotated is directly transmitted to the outer tank, there is a problem that the set (set) noise is increased.

In order to solve the above problems, an object of the present invention is to reduce the noise of the washing machine by reducing the transmission of vibration generated in the rotation of the drive unit to the outer tank.

1 is a block diagram showing a structure of a driving unit of a conventional washing machine.

FIG. 2 is a cross-sectional view of the rotor bushing and the shaft of FIG. 1 taken along the line II. FIG.

Figure 3a is a block diagram showing the structure of the drive unit of the washing machine of the present invention.

Figure 4 is an exploded perspective view showing an enlarged installation structure of the lower washing shaft and the rotor bushing and bracket of Figure 3b.

Explanation of symbols on the main parts of the drawings

51: stator 52: rotor

53: rotor housing 54: rotor bushing

54a: serration part 54b: bushing hole 54c: fastening hole 55: bracket 55a: serration hole 55b: seating part 55c: through hole 56: dustproof member 56a: head part 56b: body 56c: hole 57: fastening member 57a: threaded part 57b: bar part 57c: boss part 58: lower washing shaft 58a: serration portion 58c: boss portion 59: upper washing shaft

In order to achieve the above object, the present invention is a rotor bushing is provided in the center of rotation of the rotor housing, the central bushing hole is formed in the center; A bracket installed at a lower portion of the rotor bushing and having a hole formed at a center thereof; An anti-vibration fastening means for fixing the rotor bushing to the rotor housing, transmitting the rotational force of the rotor housing to the bracket, and cushioning the vibration generated when the rotor is rotated; It is installed rotatably inserted into the bushing hole of the rotor bushing, is installed to be constrained to the bracket in a state penetrating the hole of the bracket, the lower washing shaft to receive the rotational force of the rotor by the bracket: The dustproof structure of the washing machine drive unit is provided.

Hereinafter, the dustproof structure of the washing machine driving unit according to the present invention will be described with reference to FIGS. 3 and 4. FIG. 3A is a configuration diagram illustrating a driving unit structure of the washing machine of the present invention, and FIG. A ″ is an enlarged view, and FIG. 4 is an exploded perspective view showing an enlarged view of an installation structure of the lower washing shaft, the rotor bushing, and the bracket of FIG. 3.

Referring to FIG. 3, the washing machine driving unit is provided with a bearing housing 13 at a lower center of the outer tub 11, and a dehydration shaft 25 is rotatably installed inside the bearing housing 13. An inner tank (not shown) is connected to an upper end of the contraction 25, and an upper washing shaft 59, a reducer 22, and a lower washing shaft 58 are rotatably installed in the dehydration shaft 25. A pulsator (not shown) is connected to the upper end of the upper washing shaft 59.

The stator 51 is fixed to the lower portion of the bearing housing 13, and the rotor 52 is installed outside the stator 51 so as to be rotatable by the magnetic field of the stator 51, and the rotor 52 is Supported by the rotor housing 53.

In this case, a rotor bushing 54 and a bracket 55 are installed at the rotation center of the rotor housing 53, and a lower washing shaft 58 is inserted into the rotor bushing 54 and the bracket 55. The installation structure of the lower washing shaft, the rotor bushing and the bracket will be described below.

A serrated serration portion 54a is formed on the outer circumferential surface of the lower end of the dehydration shaft 25 and the outer circumferential surface of the upper end of the rotor bushing 54. In addition, it is also understood that a faceted portion having a polygonal shape may be formed instead of the serration portion 54a.

Coupling 26 is installed to the serration part 54a so as to be movable up and down, and the coupling 26 is moved up and down by a clutch system (not shown) by a predetermined distance.

In more detail, when the coupling 26 is moved upward, the protrusion formed in the coupling is caught in the groove (not shown) of the bearing housing 13 to restrain the dehydration shaft 25 so that the washing shaft rotates at a low speed. Be sure to In addition, when the coupling 26 is moved downward, the coupling restrains the dehydration shaft 25 and the rotor bushing 54 so that the washing shaft and the dehydration shaft rotate at high speed as the rotor 52 is rotated. do.

A driving unit of the washing machine will be described in more detail with reference to FIGS. 3 and 4.

The driving unit of the washing machine is installed at the center of rotation of the rotor housing 53 and the rotor bushing 54 having a circular bushing hole 54b formed at the center thereof, and installed at a lower portion of the rotor bushing 54 and having a hole at the center thereof. The bracket 55 having the 55a) and the rotor bushing 54 are fixed to the rotor housing 53, and the rotational force of the rotor housing is transmitted to the bracket 55 to cushion the vibration generated when the rotor 52 is rotated. It is installed to be rotatably inserted into the dust-proof fastening means and the bushing hole (54b) of the rotor bushing, and to be constrained to the bracket 55 in the state passing through the hole (55a) of the bracket (55), And a lower washing shaft 58 which receives the rotational force of the rotor 52 by the bracket 55. At this time, a lower portion of the lower washing shaft 58 has a serration portion 58a and a threaded portion 58c. Is formed, the serration of the lower laundry shaft 58 in the center of the bracket 55 A hole 55a having a shape corresponding to the shunt portion 58a is formed. Of course, in the present embodiment, a serration portion 58a is formed at the lower end of the lower washing shaft 58, and a central portion of the bracket 55 is formed. Although a hole 55a having a serration formed on an inner circumferential surface of the lower washing shaft 58 corresponding to the serration portion 58a of the lower washing shaft 58 is illustrated (see FIG. 4), the lower washing shaft 58 has a lower portion in FIG. 4. Not only the serration as shown in the figure can be formed, but also the structure surface to which the lower washing shaft is interlocked to the bracket can be applied. Thus, the lower washing shaft 58 is attached to the bracket 55 By constraining, it has a structure in which the rotational force transmitted to the bracket 55 during the rotor rotation is directly transmitted to the lower washing shaft. As a means for coupling the lower washing shaft 58 and the bracket 55, the nut 65 is used. Thread portion 58 formed at the lower end of the lower washing shaft 58. The nut 65 is tightened toward the bracket 55 while c) passes through the hole 55a of the bracket 55. The serration-shaped serration portion (c) is formed on the outer peripheral surface of the upper portion of the rotor bushing 54. 54a is formed, and the bushing hole 54b formed in the center of the rotor bushing 54 is a hole having a diameter in which the washing shaft is slidable. In addition, a circular seating groove is formed in the center of the lower surface of the rotor bushing 54. In the center of the bracket 55, a circular seating portion 55b is formed to protrude. At this time, the seating portion (55b) is located inside the seating groove, it is installed so as not to contact each other. That is, as shown in FIG. 3B, a gap G is maintained between the rotor bushing 54 and the bracket 55 so that vibration is not transmitted from the rotor bushing 54 toward the bracket 55 when the motor is driven. Meanwhile, the rotor bushing 54 and the bracket 55 are stably fixed to the rotor housing 53 by the fastening means. The fastening means is such that the bracket 55 and the rotor housing 53 interlock with each other. While being interposed between the fastening member 57 and the fastening member 57 for fixing the rotor bushing 54 to the rotor housing 53, the fastening member 57 and the bracket 55 are transmitted to the fastening member 57 when the rotor is rotated. In this case, as shown in FIG. 4, the fastening member 57 is threaded to be fastened through the fastening hole 54c of the rotor bushing 54. 57a) and opposite to the threaded portion 57a and corresponding to the fastening hole 54c of the rotor bushing 54. A cylindrical bar portion 57b inserted into the through hole 55c of the bracket 55 connects the threaded portion 57a and the bar portion 57b and has a larger cross-sectional area than the cross-sectional area of the threaded portion or the bar portion. In other words, as shown in FIG. 4, a plurality of fastening holes 54c are formed at the edge of the rotor bushing 54, and at the edge of the bracket 55. A plurality of through holes 55c are formed to correspond to the fastening holes 54c of the rotor bushing 54. Thus, the rotor bushing 54 and the by means of threaded portions 57a of the fastening member 57 are formed. The rotor housing 53 is tied together by being fastened to each other, and the other bar portion 57b has a rotational force of the rotor housing 53 by the bar portion inserted into the through hole 55c of the bracket 55 to the bracket 55. By being transmitted, the lower washing shaft 58 can be rotated. On the other hand, the dustproof member 56 As shown in FIG. 4, the head 55a is provided to prevent the bracket 55 and the fastening member 57 from directly contacting each other, and a cylindrical shape is inserted into the through hole 55c of the bracket below the head 56a. The body 56b is integrally formed, the head portion 56a is caught around the through hole 55c of the bracket 55, and a hole 56c is formed at the center of the cylindrical body 56b. The bar portion 57b of the fastening member 57 is inserted through the hole 56c. That is, looking at the longitudinal cross-sectional shape of the dustproof member 56 " "It can be understood that it is formed in the shape. The dustproof member 56 is preferably made of a flexible material such as rubber. As such, the dustproof member 56 is the center and the bracket of the fastening member 57. By preventing the upper surface of the contact with 55 to prevent the vibration generated during the rotation of the rotor is directly transmitted to the bracket 55. In addition, although not shown, as another embodiment of the fastening means for vibration It may be composed of a plate-shaped dustproof member interposed between the upper surface and the lower surface of the rotor bushing 54, and a fastening member for fastening the rotor bushing to the rotor housing.

Accordingly, by absorbing the vibration transmitted to the bracket by the plate-shaped anti-vibration member to reduce the vibration transmitted to the wash shaft and the outer tank.

On the other hand, the rotor 52 is preferably installed so as to maintain a constant gap so that the magnetic field of the stator 51 can fully act on the rotor 52 without friction with the stator 51 during rotation.

That is, the lower laundry shaft 58 is rotatably installed in the bushing hole 54b of the rotor bushing 54, so that the rotor bushing 54 is lower washing shaft 58 when the lower laundry shaft 58 is rotated. ) It has a structure that supports the outer circumferential surface.

Referring to the operation of the drive unit of the washing machine having the above structure is as follows.

Referring to the washing operation of the washing machine, the rotor 52 and the rotor housing 53 are rotated by the magnetic field of the stator 51, the rotational force is transmitted to the lower washing shaft 58 by the bracket (55). . The coupling 26 is moved upward by the clutch assembly to transmit the rotational force of the rotor 52 to the wash shaft.

At this time, since the rotor bushing 54 and the bracket 55 are fastened by the anti-vibration member 56 and the fastening member 57, even if the vibration generated when the rotor 52 is rotated is transmitted to the fastening member 57. It is absorbed by the dustproof member 56. This action significantly reduces the vibrations transmitted to the laundry shaft and the tub.

Then, the rotational force transmitted to the bracket 55 is transmitted to the lower washing shaft 58, the lower washing shaft 58 has the same rotational speed (rpm) of the rotor (52). The reducer 22 connected to the lower washing shaft 58 rotates the upper washing shaft 59 at a low speed by reducing the rotation speed at a predetermined ratio. Thus, the pulsator connected to the upper laundry shaft 59 rotates at a low speed to form a stream of water.

Next, in the dehydration operation of the washing machine, the coupling 26 is moved downward by the clutch assembly, so that the serration portion 54a formed at the lower end of the dehydration shaft 25 and the upper end of the rotor bushing 54 at the same time. Redeem. Therefore, the dehydration shaft and the washing shaft can be simultaneously rotated by the rotational force generated during the rotor rotation.

At this time, since the vibration generated during the rotation of the rotor is absorbed by the vibration member, the vibration transmitted to the outer tub is substantially reduced. Accordingly, it is possible to prevent set noise generated by vibration.

In addition, the rotor is rotated while the rotation speed is changed within a certain range during the rotation, but the rotor bushing 54 to support the lower washing shaft 58 to stably shake, that is, the ripple phenomenon (ripple) The vibration caused by the phenomenon is reduced.

As described above, the present invention allows to reduce the vibration transmitted to the outer tank while maintaining a constant gap between the rotor and the stator during operation of the drive unit. Accordingly, by reducing the set noise caused by the drive unit to improve the reliability of the product.

In addition, by reducing the noise caused by the vibration it was possible to implement a low noise washing machine, which is a recent technical challenge.

Claims (6)

A rotor bushing installed at a rotation center of the rotor housing and having a circular bushing hole at a central portion thereof; A bracket installed at a lower portion of the rotor bushing and having a hole formed at a center thereof; An anti-vibration fastening means for fixing the rotor bushing to the rotor housing, transmitting the rotational force of the rotor housing to the bracket, and cushioning the vibration generated when the rotor is rotated; It is installed rotatably inserted into the bushing hole of the rotor bushing, is installed to be constrained to the bracket in a state penetrating the hole of the bracket, the lower washing shaft to receive the rotational force of the rotor by the bracket: Dustproof structure of the washing machine drive unit made of. The method of claim 1, At the lower end of the lower washing shaft is formed a serrated serration portion or a polygonal face portion, Dustproof structure of the washing machine driving unit, characterized in that the central portion of the bracket is formed in the serration hole or the surface hole corresponding to the serration portion or surface portion of the lower washing shaft. The method of claim 1, The dustproof fastening means, A fastening member for fixing the rotor bushing and the bracket to the rotor housing; And a dustproof member interposed between the fastening member and the bracket to dampen vibrations transmitted to the fastening member when the rotor is rotated. The method of claim 3, wherein The fastening member, A threaded portion fastened through the fastening hole of the rotor bushing edge, a cylindrical bar portion formed opposite the threaded portion and inserted into a through hole of a bracket corresponding to the fastening hole of the rotor bushing; And a boss portion connecting the bar portion and having a larger cross-sectional area than the threaded portion or the cross-sectional area of the bar portion. The method of claim 3, wherein The dustproof member, A head portion which is not caught directly by the bracket and the fastening member and is caught around the through hole of the bracket; And a cylindrical body integrally formed under the head and inserted into the through hole of the bracket. The method of claim 1, The dustproof fastening means is: A plate-shaped dustproof member interposed between the upper surface of the bracket and the lower surface of the rotor bushing; Fastening member for fastening the rotor bushing and the bracket to the rotor housing: dustproof structure of the washing machine drive unit characterized in that consisting of.