KR20040010794A - direct drive motor with upwardly bent cooling fan in washing machine - Google Patents

Abstract

PURPOSE: A direct coupled motor is provided to reduce noises and power losses by permitting the driving force of motor to be directly transmitted to the drum. CONSTITUTION: A direct coupled motor(5) comprises a stator(14) and a rotor(13) covering the stator. The rotor includes a rear wall(13a) made of a steel material and a side wall(13b) formed integrally with the rear wall and made of a steel material. The rear wall has a certain part which is bent to form a cooling fin(133) directed toward the stator inserted into the aperture of the rotor. A through hole(134) formed by bending the rear wall. The rear wall, the side wall and the cooling fin are arranged integrally with each other.

Description

Direct drive motor with upwardly bent cooling fan in washing machine

The present invention relates to a drum washing machine, and more particularly, to an improvement in the structure of the driving unit of the drum washing machine.

In general, the drum washing method is a method in which the laundry is performed using the friction force of the rotating drum and the laundry by receiving the driving force of the motor while the detergent, the washing water, and the laundry are put in the drum. These don't get tangled with each other, and can be washed and pounded.

Referring to Figure 1 briefly described the structure of a conventional drum washing machine as follows.

1 is a vertical cross-sectional view illustrating a conventional drum washing machine, in which a tub 2 is installed inside a cabinet 1 and a drum 3 is rotatably installed in the center of the tub 2.

In addition, a motor 5a is installed at a lower side of the tub 2, and a motor pulley 18 is axially connected to the motor 5a.

On the other hand, a drum shaft is installed behind the drum 3, and a drum pulley 19 is installed on the drum shaft.

In addition, the drum pulley 19 provided on the drum shaft and the motor pulley 18 connected to the motor 5a are connected by a belt 20 which is a power transmission element.

A door 21 is installed in front of the cabinet 1, and a gasket 22 is installed between the door 21 and the tub 2.

Meanwhile, a hanging spring 23 for supporting the tub 2 is installed between the inside of the upper surface of the cabinet 1 and the upper side of the outer peripheral surface of the tub 2, and the inside of the lower surface of the cabinet 1 and the tub. (2) A friction damper 24 is provided between the lower side of the outer circumferential surface to damp the vibration of the tub 2 generated during dehydration.

However, in the conventional washing machine, the driving force of the motor 5a is drum by the belt pulley 18 connecting the motor pulley 18 and the drum pulley 19 and the motor pulley 18 and the drum pulley 19. Since it is delivered to (3), it has the following disadvantages.

First, since the driving force of the motor 5a is transmitted directly through the belt 20 wound around the motor pulley 18 and the drum pulley 19 instead of being directly transmitted to the drum 3, energy loss occurs in the driving force transmission process. .

In addition, since the driving force of the motor 5a is not directly transmitted to the drum 3 but is transmitted through many parts such as the motor pulley 18, the drum pulley 19, and the belt 20, a lot of noise is generated in the power transmission process. This will occur.

In addition, in order to transfer the driving force of the motor 5a to the drum 3, many parts such as the motor pulley 18, the drum pulley 19, the belt 20, and the like are required, thereby increasing the number of assembly operations of the product.

In addition, as described above, as many parts are required to transmit the driving force of the motor 5a to the drum 3, there are disadvantages in that a failure point and a frequency of failure increase.

In short, the conventional drum washing machine indirectly transmits the driving force of the motor 5a to the drum 3 by using the motor pulley, the drum pulley and the belt. In addition, there were many problems such as lowering the washing power.

In addition, the conventional drum washing machine has a disadvantage in that the tub 2 is generally made of stainless steel, which is expensive in cost, poor in formability, and heavy in weight.

In this regard, Korean Patent Publication No. 1999-0013456 introduced a system of a direct drum washing machine, but when the stator is directly fastened to the rear wall of the tub, the concentricity of the stator is not maintained due to the breakage or deformation of the fastening part due to the vibration of the motor. There was this. In addition, when manufacturing the bearing housing and the tub separately as another embodiment for solving the above problems, not only the assembly process is difficult, but also the entire bearing housing protrudes out of the tub has a disadvantage of occupying a lot of space. In addition, the bearing housing has a problem in that it is vulnerable to vibration because only one side is supported by a screw, not only the whole, but also a complex waterproof structure for waterproofing the tubing and the bearing housing as well as the structure for waterproofing the bearing itself. There was a manufacturing disadvantage. In addition, the inner housing and the outer collar, which are separate parts for supporting the bearing, must be separately provided inside the bearing housing. In the case of the rotor, the permanent magnet and the back yoke of the iron plate and the iron plate are separately configured, making the rotor extremely difficult.

The present invention is to solve the above problems, by improving the drive unit structure of the drum washing machine to be directly transmitted to the driving force of the motor to reduce the noise, failure, energy waste, and further improve the washing power. It is an object of the present invention to provide a drum washing machine drive structure with a new structure.

Figure 1 is a longitudinal sectional view showing a conventional drum washing machine configuration example

Figure 2a is a longitudinal sectional view showing the drum washing machine configuration of the present invention

FIG. 2B is an enlarged detail view of portion A of FIG. 2A, and is a longitudinal cross-sectional view of a driving unit structure of a drum washing machine according to the present invention; FIG.

3 is a partially cutaway perspective view of the rotor of FIG.

4 is an enlarged perspective view of portion B of FIG.

5 is a bottom perspective view of FIG.

6 is a perspective view showing the stator of FIG.

7 is a perspective view of the connector of FIG.

8 is a bottom perspective view of FIG.

Explanation of symbols on the main parts of the drawings

1: cabinet 2: tub

200: rear wall 201: hub

202,204: Fastening boss 203: Rib

3: drum 4: shaft

400: Serration 5: Motor

6a, 6b: Front and rear bearings 7: Bearing housing

8a, 8b: step 9a, 9b: stepping for positioning

10: Spider 11: Bushing

12: sealing member 13: rotor

13a: rear wall 13b: side wall

13c: magnet 130: seating surface

131: through hole 132: hub portion

133: cooling fin 134: through hole

135: embossing unit 136: drainage hole

137: fastening hole 138: positioning hole

14: Stator 140: Frame

141: winding unit 142: coil

143: fastening rib 15a, 15b, 15c, 15d: fastening member

16: Connector 160: Positioning protrusion

161: reinforcement rib 162: fastener

163: Hub 164: Serration

17: supporter 18: motor pulley

19: Drum pulley 20: belt

21: door 22: gasket

23: hanging spring 24: friction damper

In order to achieve the above object, the present invention provides a tub installed inside the cabinet, a drum installed inside the tub, a shaft axially connected to the drum to transfer the driving force of the motor to the drum, and the outer peripheral surface of the shaft both ends A drum washing machine having a bearing installed in the drum washing machine; The center of the rear wall portion of the tub is provided with a drive unit structure of the drum washing machine, characterized in that the bearing housing made of metal for supporting the bearings respectively provided on the outer peripheral surface of the shaft both ends.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6.

Figure 2a is a longitudinal cross-sectional view showing the configuration of the drum washing machine of the present invention, Figure 2b is an enlarged detail of the portion A of Figure 2a, a longitudinal cross-sectional view of the drive unit structure of the drum washing machine according to the present invention.

3 is a perspective view of the rotor of FIG. 2, FIG. 4 is a perspective view of portion B of FIG. 3, and FIG. 5 is a bottom perspective view of FIG. 3.

6 is a perspective view illustrating the stator of FIG. 2, FIG. 7 is a perspective view illustrating the connector of FIG. 2, and FIG. 8 is a bottom perspective view of FIG. 7.

The present invention is connected to the tub (2) installed inside the cabinet (1), the drum (3) installed inside the tub (2), and the drum (3) axially connected to the driving force of the motor (5) drum ( A drum washing machine having a shaft (4) for transmitting to 3) and a bearing provided on an outer circumferential surface of both ends of the shaft (4); The tub 2 is made of a plastic material, and in the center of the rear wall portion 200 of the tub 2, a bearing housing 7 made of metal for supporting bearings respectively installed on the outer circumferential surfaces of both ends of the shaft 4 is provided. It is provided and configured.

At this time, the metal bearing housing 7 is configured to insert the injection molding of the tub (2) made of plastic material to be integral with the tub rear wall portion (200).

Preferably, the bearing housing 7 is made of aluminum alloy.

Meanwhile, the metallic bearing housing 7 supports the front bearing 6a and the rear bearing 6b respectively installed on the inner circumferential surface thereof so that each bearing is supported without being separated from the bearing housing 7. (8a) (8b) are formed and comprised, respectively.

At this time, the step 8a formed at the front of the step 8a, 8b formed on the inner circumferential surface of the bearing housing 7 is provided at the front end of the bearing intermediate front end respectively provided on the outer circumferential surface of both ends of the shaft 4. The stepped portion 8b, which is formed in a “a” shape so as to form a structure supporting the rear end portion of the bearing 6a, is formed at the rear of the stepped portions 8a and 8b formed on the inner peripheral surface of the bearing housing 7 It is formed in a "b" shape so as to form a structure for supporting the front end portion of the rear bearing 6b installed at the end.

On the other hand, the shaft 4 of the front bearing 6a and the rear bearing 6b is located on the outer circumferential surface of the shaft 4 which is located inside the bearing housing 7 and transmits the driving force of the motor 5 to the drum 3. Positioning step 9a, 9b for allowing the installation position on the image to be determined is configured to be formed at the front and the rear, respectively.

In the above, the front end of the shaft 4 is coupled to a spider 10 provided on the rear wall of the drum 3, and the front bearing 6a is exposed from the portion exposed behind the spider 10 of the shaft 4. Brass bushing 11 is press-fitted in the area up to the shaft 4 to prevent rust, and a sealing member 12 is installed on the outer surface of the bushing 11 to prevent moisture ingress into the bearing side. do.

On the other hand, the rotor 13 constituting the direct type motor 5 is fastened to the center of the rear end of the shaft 4, and is fixed to the rear wall part 200 of the tub 2 inside the rotor 13. The stator 14 constituting the direct motor together with the rotor 13 is positioned.

At this time, the rotor 13 is made of a steel plate, as shown in Figures 3 to 5, on the side wall surface 13b extending forward from the edge of the rear wall surface (13a), the magnet is mounted in front of the inner surface A bent portion having a seating surface 130 for supporting 13c is formed along the circumferential direction, and a bolt or the like for coupling the rotor 13 to the shaft 4 at the center of the rear wall surface 13a. The hub portion 132 is formed so that the through-hole 131 through which the threaded portion of the fastening member 15b is formed.

Here, the overall shape of the rotor 13 is preferably formed by press working.

In addition, a plurality of cooling fins are formed around the hub 132 of the rotor 13 to blow air into the stator 14 when the rotor 13 rotates to cool the heat generated by the stator 14. A fin 133 is formed radially, wherein the individual cooling fins 133 are formed to have a predetermined length in the radial direction.

At this time, the cooling fin 133 is bent at an angle of 90 ° with respect to the rear wall surface by the lancing processing to form an opening toward the opening side, the through hole 134 formed by the lancing processing is a vent hole It will play a role.

In addition, an embossing portion 135 for strengthening the strength of the rotor 13 is formed in the region between each cooling fin 133 of the rotor 13 rear wall surface 13a and the adjacent cooling fins, and the embossing On the part 135, a drain hole 136 for discharging moisture is formed.

On the other hand, the connector 16 is connected to the edge of the through hole 131 formed in the hub portion 132 of the rotor 13 on the outer circumferential surface of the rear end portion of the shaft 4 exposed to the rear bearing 6b. ) And a fastening hole 137 for fastening the rotor 13 to the rotor 13 and a positioning hole 138 for determining an assembly position of the connector 16 are formed at a predetermined interval.

In this case, the connector 16 is made of a resin material different from the rotor 13, which is a steel plate, and a vibration mode, and serves as a bushing for the rotor.

On the other hand, the connector 16, as shown in Figure 2b, 7 and 8, in the fastening hole 137 formed in the hub portion 132 of the rotor 13 along the circumferential direction in the edge region thereof A corresponding fastening hole 162 is formed, and is inserted into the positioning hole 138 of the rotor 13 between the fastening holes 162 and the fastening hole 137 and the connector 16 of the rotor 13. Positioning projection 160 is formed integrally so that the fastening hole 162 of () is automatically matched.

In addition, a serration 164 is formed on the inner circumferential surface of the hub 163 of the connector 16 to match the serration formed at the rear end of the shaft 4, and a hub outside the hub 163 of the connector 16. Reinforcing ribs 161 for strength reinforcement of 163 are provided.

On the other hand, on the rear wall portion 200 of the tub (2) is provided with a hub 201 is inserted into the bearing housing 7 in the injection molding of the tub, the fastening member (15a) outside the hub 201 Fastening boss 202 for fixing the stator 14 on the rear wall portion 200 of the tub 2 by using a spaced apart at regular intervals along the circumferential direction.

In addition, between the rear wall portion 200 and the stator 14 of the tub 2 is substantially the same shape as the outer shape of the rear wall portion 200 of the tub and fixed to the rear wall portion 200 when the stator 14 is fastened. And the supporter 17 which supports the stator 14 and maintains the concentricity of the stator 14 is interposed.

At this time, the front end of the supporter 17 is in close contact with the inner surface of the rib 203 on one side of the tub rear wall part 200, and the rear end of the supporter 17 is provided with a hub part provided at the center of the rear wall part 200 of the tub ( It is configured to be in close contact with the outer circumferential surface of the rear end of the bearing housing 7 which is not covered by the 132 and exposed.

In addition, in order to fasten the supporter 17 and the tub rear wall part 200, a plurality of fastening members 15d are coupled inside the outer circumferential surface of the supporter 17, and the stator 14 is attached to the supporter 17. It has another fastening member 15a inward of the fastening member 15d for fixing.

On the other hand, the stator 14 constituting the motor 5 together with the rotor 13, as shown in Figs. 2b and 6, the ring-shaped frame 140 and the winding provided on the outside of the frame 140 It comprises a coil 142 wound on the portion 141, the fastening rib 143 for fixing the stator 14 to the tub rear wall portion 200 inside the frame 140, the frame 140 It is formed integrally with).

The driving unit operation process of the drum washing machine of the present invention configured as described above is as follows.

When a current flows sequentially through the coil 142 of the stator 14 by the control of a motor driving controller (not shown) attached to the panel unit, the rotation of the rotor 13 occurs, and the connector 16 coupled to the rotor And the serration coupled shaft (4) is rotated, so that power is transmitted to the drum through the shaft (4) to rotate the drum (3).

On the other hand, the drum washing machine action applied to the drive unit of the present invention is as follows.

First, since the tub washing machine of the present invention is made of a plastic material having excellent heat resistance, the tub washing machine is light and injection-molded, so that the productivity is improved.

In addition, the drum washing machine of the present invention can be applied to a drum washing machine having a drying stroke because there is no thermal deformation at a high temperature because the bearing housing 7 which is a bearing support means is made of metal such as aluminum alloy.

In the present invention, when the metal bearing housing 7 is injection molded into the tub 2 made of plastic, the bearing housing is insert-injected into the hub 201 of the rear wall portion 200 of the tub so that the tub 2 Because the unit is configured to be integrated with), the process of assembling the bearing housing 7 separately to the tub rear wall 200 is omitted, thereby simplifying the assembly process and reducing the number of assembly operations.

In addition, the bearing housing 7 according to the present invention, because the step of the "b" shaped stepped jaw 8a is formed in front of the inner peripheral surface, and the "b" shaped stepped jaw 8b is formed in the rear of the inner peripheral surface, It is possible to support the rear end of the front bearing 6a and the front end of the rear bearing 6b respectively provided on the outer circumferential surfaces of both ends of the shaft 4.

That is, the metal bearing housing 7 is supported by both bearings 6a and 6b without being separated from the bearing housing 7 because the stepped portions 8a and 8b are formed on both sides of the inner circumferential surface thereof.

In addition, positioning steps 9a and 9b are respectively formed on the front and rear outer peripheral surfaces of the shaft 4, which are located inside the bearing housing 7 and transmit the driving force of the motor 5 to the drum 3. Thus, the assembling position on the shaft 4 of the front bearing 6a and the rear bearing 6b is easily determined.

On the other hand, the front end of the shaft 4 is coupled to the spider 10 provided in the rear wall of the drum 3, the front bearing (6a) from the portion exposed to the outside of the spider 10 of the shaft (4) Since the bushing 11 of the brass material is forcibly press-installed in the area up to the rust of the shaft 4 can be prevented.

In addition, since the sealing member 12 is installed on the outer surface of the bushing 11, water penetration into the bearing side is prevented.

Meanwhile, a rotor 13 constituting the direct type motor 5 is coupled to a center of the rear end portion of the shaft 4, and a stator 14 is positioned inside the rotor, and the rear wall surface of the rotor 13 ( 13a) A bent portion having a magnet seating surface 130 is formed along the circumferential direction on the sidewall surface 13b extending forward from the edge, so that the seating surface 130 is attached when the magnet 13c is attached to the inner surface of the rotor 13. Since the support of the magnet 13c is made, the rotor can be easily manufactured.

In addition, a hub portion 132 having a through hole 131 is formed at the center of the rear wall surface 13a of the rotor 13, and a fastening member such as a bolt for coupling the rotor 13 to the shaft 4. 15b can pass therethrough, and a plurality of cooling fins 133 are formed radially and have a predetermined length in the radial direction around the hub portion 132 of the rotor 13, so that the rotor 13 In the rotation, the cooling fin 133 blows air toward the stator 14 to cool the heat generated by the stator 14.

At this time, the cooling fin 133 is formed to face the opening side of the rotor 13 by the lancing process, the through-hole 134 formed by the lancing process serves as a vent.

Here, since the rotor 13 is formed of a steel sheet and is formed by press working, the time required for manufacturing the rotor becomes very short, thereby improving productivity in manufacturing the rotor.

In addition, an embossed portion 135 is formed in a region between each of the cooling fins 133 and the cooling fins of the rear wall surface 13a of the rotor 13 to improve the overall strength of the rotor 13. The drain hole 136 is formed on the 135, and the water is discharged through the drain hole.

Meanwhile, at the edge of the through hole 131 formed in the hub portion 132 of the rotor 13, a fastening hole 137 for fastening a connector and a positioning hole 138 for positioning an assembly of the connector 16 are provided. The connector 16 can be easily assembled to the rotor on the outer peripheral surface of the rear end of the shaft 4 exposed behind the rear bearing 6b to the rotor.

That is, the fastening holes 137 of the rotor 13 and the connector 16 are simply formed by fitting the positioning protrusions 160 of the connector 16 to be inserted into the positioning holes 138 of the rotor 13. ) 162 is automatically matched, and thus the fastening member 15c is fastened to the fastening holes 137 and 162 of the rotor 13 and the connector 16 so that the connector 16 and the rotor 13 Assembly can be done easily.

At this time, the connector 16 is injection molded as a resin material, and the vibration mode is different from that of the iron plate 13, so that the vibration of the rotor 13 is attenuated and transmitted to the shaft 4.

On the other hand, a serration 164 is formed on the inner circumferential surface of the hub 163 of the connector 16 to form a rotor (3) through the connector 16 as it matches the serration 400 formed at the rear end of the shaft 4. The rotational force of 13 is transmitted to the shaft 4 as it is.

In addition, a reinforcing rib 161 is formed outside the hub 163 of the connector 16 to reinforce the strength of the hub 163.

On the other hand, the outer side of the hub 201 formed on the rear wall portion 200 of the tub 2, the fastening boss 202 is formed at regular intervals along the circumferential direction, the stator using the fastening boss 202 14 can be fixed on the tub 2 rear wall 200.

At this time, between the rear wall portion 200 and the stator 14 of the tub 2 is substantially the same shape as the outer shape of the rear wall portion 200, the rear wall portion 200 of the tub (2) when the stator 14 is fastened Since the supporter 17 fixed to) is interposed, the support and concentricity of the stator 14 can be maintained.

That is, when the support 17 is fastened on the support fastening boss 204 on the tub rear wall 200 by the fastening member 15d, the front end of the supporter 17 is located on one side of the tub rear wall 200. It is in close contact with the inner surface of the rib 203, the rear end portion of the supporter 17 is exposed on the outer peripheral surface of the rear end portion of the bearing housing 7 exposed without being wrapped by the hub portion 132 provided in the center of the tub rear wall 200 In close contact with the stator 14 while supporting the stator 14, the concentricity of the stator is maintained.

On the other hand, the present invention is not limited to the above-described embodiment, it is a matter of course that changes in dimensions, shapes, materials can be made without departing from the scope of the technical idea of the present invention.

The effects of the present invention configured as described above are as follows.

First, since the drum washing machine of the present invention is a motor direct structure, noise, failure, and power loss are reduced.

In addition, the drum washing machine of the present invention can be applied to a product having a drying function because there is no thermal deformation because the bearing housing is made of metal.

In the drum washing machine of the present invention, the rotor has a steel plate structure and can be manufactured by press molding, so that the moldability is excellent and the time required for manufacturing is very short, thereby improving productivity.

In addition, since the rotor of the present invention has a magnet seating surface, workability is improved when the magnet is mounted, and cooling fins and through holes are provided along with drainage holes, thereby preventing overheating of the motor, thereby improving reliability and extending the life of the motor. You can do it.

In addition, the drum washing machine of the present invention is provided with a connector having a different vibration mode from the rotor to reduce vibration transmitted from the rotor to the shaft, and the supporter maintains the stator and maintains concentricity effectively.

As described above, the present invention improves the structure of the driving unit of the drum washing machine, thereby reducing the noise and failure by allowing the driving force of the motor to be directly transmitted to the drum to improve the washing power by reducing the power loss and reliability of the product It is possible to improve, and the productivity of the parts constituting the drive unit is improved it is possible to improve the productivity during production.

Claims (8)

In the direct-type motor for a washing machine having a stator and a rotor formed to surround the stator to directly drive a drum for washing, The rotor is composed of a side wall surface 13b of steel material integrally pressed with the rear wall surface 13a of steel material, A part of the rear wall surface 13a is bent to form a cooling fin 133 to face the stator inserted into the opening of the rotor, and at the same time, the through hole 134 formed by bending the rear wall surface 13a is formed with a vent hole. The rear wall surface (13a), the side wall surface (13b) and the cooling fins (133) is a direct-type motor for a washing machine having an upwardly bent cooling fin, characterized in that the integral configuration. The method of claim 1, The cooling fin 133 is a direct-attached motor for a washing machine having an upwardly bent cooling fin, characterized in that formed by bending 90 degrees toward the opening of the rotor. The method of claim 1, The cooling fin 133 is a direct type motor for a washing machine having a cooling pin bent upwardly characterized in that it is formed to have a predetermined length in the radial direction. The method of claim 1, Direct connection type for a washing machine having an upwardly bent cooling fin, characterized in that the drain hole 136 for water discharge is formed in the region between the cooling fin 133 and the cooling fin 133 of the rear wall surface 13a of the rotor. motor. The method of claim 1, Direct-type motor for a washing machine having an upwardly bent cooling fin, characterized in that the embossed portion 135 for strength reinforcement is formed in the region between the cooling fin 133 and the cooling fin 133 on the rear wall of the rotor. The method of claim 5, wherein Directly connected motor for a washing machine having an upwardly bent cooling fin, characterized in that the drainage hole 136 for water discharge is formed on the embossing portion (135). The method of claim 1, Direct connection motor for a washing machine having an upwardly bent cooling fin, characterized in that the center of the rear wall surface (13a) further comprises a hub portion 132 protruding from the rear wall surface. The method according to any one of claims 5 to 7, The embossing part 135 is directly connected to a washing machine having an upwardly bent cooling fin, which is formed between the outer circumference of the rear wall and the outer circumference of the hub portion 132 and between the cooling fin 133 and the cooling fin 133. motor.