KR100662388B1 - Washing machine - Google Patents

Abstract

A washing machine is provided to reduce noise and energy-waste factor by improving rotor frame, make driving force of a motor transferred to drum directly, and prevent a rust. In a washing machine, a tub keeps the washing water. A drum rotatably mounted on an inner side of the tub washes the laundry using a rotation thereof. A shaft connected to the drum inside the tub with passing through the tub transfers a driving force of a motor to the drum. A stator having a winding portion on which a coil is wound is fixedly coupled at a rear wall portion of the tub. An outer rotor rotatably mounted on an outer face of the stator includes a magnet(13c), a ring-shape back yoke(300) on which a magnetic pass is formed, and a rotor frame, The rotor frame formed by a die casting method with an aluminum material has a later surface portion(13b) supporting the magnet(13c) and the back yoke(300), and a rear wall portion(13a) transferring a revolving force to the shaft. The back yoke(300) is fixedly coupled at an inner side of the lateral face portion(13b) of the rotor frame by being inserted into a mold of the rotor frame when applying the die casting process thereto.

Description

Washing machine

1 is a longitudinal sectional view showing a conventional washing machine configuration

Figure 2 is a longitudinal cross-sectional view showing a washing machine configuration of the present invention.

3 is an enlarged detail view of a portion A of Figure 2, a longitudinal cross-sectional view of the drive unit structure of the washing machine according to the present invention;

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

5 is a perspective view showing the stator of FIG.

6 is a perspective view of the connector of FIG.

7 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 bearing 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: bending portion

131: through hole 132: hub portion

133: cooling fin 134: through hole

137: fastening hole 138: positioning hole

14: Stator 140: Insulator

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: Herb 164: Serration

17: Supporter 18: Motor pulley

19: Drum pulley 20: Belt

21: door 22: gasket

23: hanging spring 24: friction damper

300: White York

The present invention relates to a washing machine, and more particularly, to improving the drive structure 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 have a pounding and scrubbing wash effect.

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 at an inner center of the tub 2.

In addition, a motor 5a is installed at the 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 drum washing machine, the driving force of the motor 5a is driven by the motor pulley 18 and the drum pulley 19 and the belt 20 connecting the motor pulley 18 and the drum pulley 19. Since the structure is delivered to the drum (3) 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, poor formability, and heavy weight.

On the other hand, in order to solve this problem, the applicant of the Republic of Korea Patent NO. In 457429, a direct type motor is provided as a driving unit structure of a drum washing machine.

In the above-described invention, the rotor frame is formed of a press plate made of a steel sheet to transfer the rotational force of the rotor directly to the drum, while the iron plate itself is formed without the back yoke (back yoke) function of the back yoke In order to solve the above problems of the indirect driving method, a rotor frame having a simple structure was provided.

However, such a steel plate rotor frame has a problem in that it is difficult to form a precision, especially concentricity, that is required at a thickness greater than a predetermined thickness due to the characteristics of press working. The street had a problem.

In addition, when a current flows in the stator coil, magnetic flux is generated. In order to form a passage through which the magnetic flux flows, that is, a magnetic path, a back yoke of a magnetic material having an appropriate thickness behind the magnet is required. In this case, when the thickness of the back yoke is thin, the magnetic flux is saturated, and there is a limit of increase of the motor output even if the current is increased to produce a strong output.

Therefore, in terms of diversification of the product, forming the rotor frame performing the back yoke function with the iron plate has a certain limitation due to the thickness thereof.

And there existed a possibility of rust generate | occur | producing on the surface of a rotor frame by the characteristic of iron plate material. Due to the occurrence of rust, the strength of the rotor frame is lowered, and even rust powder falling from the rotor frame may be attached to an air gap between the magnet and the stator to restrain the rotation of the rotor.

On the other hand, the rotor frame of the iron plate material after the formation of the rotor frame also had a difficult problem in machining or other processing for improvement of precision.

The present invention is to solve the above problems, by improving the structure of the drive unit of the washing machine, in particular the rotor frame to directly transfer the rotational force of the rotor to the shaft to drive the driving force of the motor directly to the drum noise, failure, energy waste It is an object of the present invention to provide a drum washing machine with reduced urea and improved durability and stability.

In order to achieve the above object, the present invention and the tub is wash water is stored; A drum rotatably provided inside the tub to wash laundry by rotation; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; A stator having a coil wound around the stator and fixedly coupled to a rear wall of the tub; A washing machine comprising an annular back yoke having a magnet and a magnet, and comprising an outer rotor rotatably provided on an outer side of the stator, wherein the outer rotor includes a side wall portion supporting the magnet and the back yoke. And a rotor frame having a rear wall portion for transmitting rotational force to the shaft, the rotor frame being formed by die casting of aluminum, and the back yoke is inserted into a mold of the rotor frame when die casting the rotor frame. Provided is a drum washing machine fixedly coupled to the inside of the frame side wall.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 7.

Figure 2 is a longitudinal sectional view showing a washing machine configuration of the present invention, Figure 3 is an enlarged detail of the A portion of Figure 2, a longitudinal sectional view of the drive unit structure of the washing machine according to the present invention.

4 is a partially cutaway perspective view of the rotor of FIG. 3, and FIG. 5 is a perspective view of the stator of FIG. 3. 6 is a perspective view illustrating the connector of FIG. 3, and FIG. 7 is a bottom perspective view of FIG. 6.

As shown in Figures 2 to 3, the present invention is installed on the cabinet side tub (2) (tub) in which the wash water is stored, rotatably provided inside the tub (2) to wash the laundry by rotation A drum (3), a shaft (4) which is axially connected to the drum (3) through the tub to transfer the driving force of the motor (5) to the drum (3), and a coil It comprises a stator (14) and an outer rotor (13) fixedly coupled to the rear wall of the tub with a wound winding.

Here, the outer rotor 13 includes a magnet 13c (magnet), an annular back yoke 300 having a magnetic path, and a rotor frame.

In addition, the rotor frame includes a side wall portion 13b and a rear wall portion 13a, wherein the side wall portion rotates outside the stator 14 by supporting the magnet 13c and the back yoke 300. In this case, the rear wall portion 13a transmits the rotation of the magnet and the back yoke to the shaft 4.

Here, the side wall portion and the rear wall portion is preferably formed of an aluminum material, preferably aluminum alloy, the side wall portion and the rear wall portion is preferably formed integrally.

In addition, the rotor frame may be formed by a die casting method suitable for mass production.

Meanwhile, the present invention may include a supporter 17 interposed between the rear wall surface 200 of the tub and the stator 14 to increase the bonding strength between the tub and the stator.

In addition, the present invention is preferably provided on the rear wall portion 200 of the tub, and further comprises a bearing housing (7) provided with a bearing for supporting the shaft (4) rotatably therein.

Here, the stator 14 may be fixedly coupled to the rear wall portion 200 of the tub through the bearing housing 7 and the supporter 17.

In this case, the bearing housing is preferably formed of a metal material, in particular an aluminum alloy of aluminum material, in the injection molding of the tub (2) of plastic material, the insert injection is configured to be integral with the tub rear wall 200 desirable.

Here, the bearing housing 7 may be integrally formed with the supporter to simultaneously perform the function of the supporter. That is, the supporter may be integrally formed with the bearing housing so that the insert may be injected during injection molding of the tub, and only the coupling portion coupled with the bearing housing may be exposed to the rear of the tub.

When the bearing housing 7 and the supporter 17 are integrally formed as described above, a separate process of coupling the bearing housing or the supporter when the stator 14 is fixed to the rear wall part 200 of the tub in an assembly line is performed. Since it can be omitted, it will be possible to reduce manufacturing costs.

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 in front of the step 8a and 8b formed on the inner circumferential surface of the bearing housing 7 is installed at the front end of the bearings respectively installed on the outer circumferential surfaces of both ends of the shaft 4. The stepped portion 8b, which is formed in a “a” shape to form a structure for supporting the rear end portion of the front bearing 6a, and formed at the rear of the stepped portions 8a and 8b formed on the inner circumferential surface of the bearing housing 7, It is formed in a "b" shape to form a structure for supporting the front end of the rear bearing (6b) is provided in the rear 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. In the area up to, the bushing 11 made of brass is press-fitted to prevent rust of the shaft 4, and the outer side of the bushing 11 is provided with a sealing member 12 for preventing moisture from entering the bearing side. do.

Meanwhile, the rotor 13 constituting the direct type motor 5 is fastened to the center of the rear end of the shaft 4, and the rotor 13 is fastened to the rear wall surface 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 frame is made of aluminum, as shown in Figs. 3 and 4, the magnet (13c) mounted on the inside on the side wall portion (13b) extending forward from the edge of the rear wall portion (13a). A bent portion having a seating surface 130 to support the circumferential direction is formed, and a fastening member such as a bolt for coupling the rotor 13 to the shaft 4 at the center of the rear wall portion 13a. The hub portion 132 having the through hole 131 through which the 15a can pass is formed.

Of course, the magnet 13c is not necessarily supported on the seating surface 130, and when a magnet having a small capacity is coupled to the seating surface 130, the magnet 13c may be coupled to the inside of the sidewall part after being lifted a predetermined height above the seating surface.

As shown in FIG. 4, the rotor frame is preferably integrally formed with the side wall portion 13b and the rear wall portion 13a, and the forming method is preferably formed by die casting an aluminum material.

In addition, a plurality of cooling fins 133 acting to cool the heat generated by the stator 14 by blowing air toward the stator 14 when the rotor 13 rotates around the hub part 132 of the rotor frame. Fin is formed radially, wherein the individual cooling fins 133 are formed to have a predetermined length in the radial direction.

In addition, the cooling fin 133 is formed integrally with the rotor frame, it is preferable to extend in the radial direction with a difference in height from the hub portion 132 to the bent portion 130, the difference in height is linear It may be formed to form a curve or to be able to intensively blow air to a portion corresponding to a specific portion of the stator that needs the most cooling.

4 illustrates a cooling fin 133 having a large height at the hub side, but on the contrary, a height at the bent side may be formed. The cooling fin 133 is integrally formed with the side wall portion 13b and the rear wall portion 13a to perform a rib function that continuously connects the hub portion 132 and the bent portion to reinforce the overall strength of the rotor frame. It will also be possible to form.

In this case, a plurality of through holes 134 are formed in the region between the cooling fins 133 of the rotor rear wall portion 13a and the cooling fins adjacent thereto to serve as water discharge and vent holes.

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

In this case, the connector 16 is made of a resin material different from the rotor frame and the vibration mode of aluminum, preferably, may be integrally formed by the rotor frame and the insert molding as an insulating material.

In this case, the fastening hole 137 and the positioning hole 138 will function as a through hole through which a part of the connector penetrates to increase the coupling force between the connector 16 and the rotor frame.

On the other hand, the connector 16, as shown in Figs. 2, 6 and 7, 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 400 formed at the rear end of the shaft 4, and the hub 163 of the connector 16 is formed. The outer side is provided with a reinforcing rib 161 for reinforcing the strength of the hub 163.

Here, the serration 164 of the connector may be formed by insert molding a member in which a serration is formed on an inner circumferential surface of a metal material having a strong strength separately.

On the other hand, the stator 14 constituting the motor 5 together with the rotor 13, as shown in Figs. 3 and 5, the ring-shaped insulator 140, and the winding provided on the outside of the insulator 140 And a coil 142 wound around the portion 141, and a fastening rib 143 for fixing the stator 14 to the bearing housing 7 is provided inside the insulator 140. It is formed integrally with.

On the other hand, the rotor comprises a stator core including a winding portion wound around the coil and an annular body portion formed with a magnetic path. Here, the insulator 140 performs a function of insulating between the stator core and the coil.

In addition, the winding part is formed to protrude in a radial direction at a predetermined interval along the circumferential direction of the body portion.

Here, the stator core may be an annular spiral core that forms a multilayer structure while spirally rotating the iron plate formed of the winding part 141 and the body part from the bottom layer to the top layer.

In this case, unlike in FIG. 5, a fastening rib 143 for coupling the stator 14 to the tub may be formed only in the insulator. In this case the insulator will have to be of adequate strength. In addition, the stator may be coupled to the tub through a fastening hole 144 formed in the fastening rib 143.

In addition, the stator core may be an annular split core in which stator core segments stacked in a multi-layer structure are bonded to each other. In other words, each of the segments may have an arc shape, and by combining them, it is possible to form one annular core.

On the other hand, in the present invention, the stator 14 forms 36 poles, and the rotor preferably forms 48 poles. This is because the more poles, the easier the position sensing and the easier the control has advantages.

Here, the 48 poles of the rotor may be formed by coupling the N pole and the S pole with 12 permanent magnet segments having a total of four poles inside the rotor frame.

Hereinafter, the coupling of the rotor frame and the back yoke in the washing machine according to the present invention will be described in detail.

First, in the present invention, the back yoke may be formed by stacking an annular iron plate, preferably a silicon steel sheet, having a width substantially the same as the thickness in the radial direction of the back yoke.

In addition, in order to reduce the loss of materials required to recreate the back yoke, the band of iron plate material having a width substantially the same as the thickness of the back yoke is formed in a multi-layer structure while spirally rotating from the bottom to the top layer in an annular shape as a whole. It will also be possible to form. That is, it may be manufactured in the same form as the spiral core of the stator core described above.

In addition, the back yoke may be formed in an annular shape by rolling a plurality of iron plates having a thickness thinner than the thickness in the radial direction of the back yoke a plurality of times. Even in this case it will be possible to reduce the loss of material.

The back yoke formed as described above is an iron plate material having a predetermined thickness, and since the back yoke is formed in a multi-layer structure, the leakage magnetic flux can be minimized, thereby enabling the efficient back yoke to function.

On the other hand, since the back yoke is made of a steel plate, the coupling by the rotor frame and the welding formed of aluminum becomes very difficult. Accordingly, the present invention provides a method of coupling the back yoke to the rotor frame.

Here, the combination of the back yoke and the rotor frame should be transmitted to the shaft through the rotor frame when the back yoke and the magnet rotates, so that the back yoke and the rotor frame should be prevented from slipping. In addition, the back yoke must be prevented from being separated from the rotor frame.

As a result, the bond strength between the back yoke and the rotor frame should be reliably high.

The present invention provides a rotor in which an annular back yoke is inserted into a mold of the rotor frame to be fixedly coupled to the inside of the rotor frame side wall part in die casting of the rotor frame in order to provide such a reliable bonding strength.

That is, similar to the insert injection method, the molten metal solidifies to increase the bond strength between the back yoke and the rotor frame.

This method is possible because the melting point of the rotor frame is lower than the melting point of the back yoke.

Here, in order to further increase the bonding strength, grooves or protrusions may be formed on the outer surface of the back yoke so that the outer surface of the back yoke may be stepped.

The grooves or protrusions may be formed in plural at predetermined intervals along the circumferential direction of the back yoke, and the height of the grooves or protrusions may correspond to the height of the side wall portion of the rotor frame.

Of course, the height of the grooves or protrusions may be formed to be smaller than the height of the side wall portion of the rotor frame, and the position of the grooves or protrusions may be formed to be approximately the middle portion of the back yoke.

That is, in the case where the position of the protrusion or the groove is formed in the middle portion of the back yoke, the coupling may perform a function of firmly preventing not only the waste of the back yoke but also the scattering.

On the other hand, after coupling the back yoke and the magnet in advance, it will be possible to insert the combined back yoke and magnet to the mold of the rotor frame.

And the side wall portion of the rotor frame extends a predetermined length radially inward to cover an upper end portion of the back yoke and the magnet.

That is, the back yoke and the magnet can be effectively prevented from scattering through the shape of the upper end of the rotor frame side wall portion.

Hereinafter, a description will be given of the driving unit assembly process and operation of the washing machine according to the present invention.

First, since the tub 2 is made of a plastic material having excellent heat resistance, the washing machine of the present invention is light and injection-molded, so that the productivity is improved.

In addition, the washing machine of the present invention can be applied to a washing machine having a drying stroke because there is no thermal deformation even 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 surface 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 from the tub rear wall surface 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 circumferential surface, and the step "b" shaped stepped 8b is formed in the rear of the inner circumferential 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 on the rear wall of the drum 3, the front bearing (6a) from the portion exposed to the spider 10 outside 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, the rotor 13 constituting the direct type motor 5 is coupled to the center of the rear end of the shaft 4, and the stator 14 is positioned inside the rotor, and the rear wall portion of the rotor 13 13a) A bent portion 130 having a magnet seating surface 130 is formed along the circumferential direction on the sidewall portion 13b extending forward from the edge, and when the magnet 13c is attached to the inner surface of the rotor 13, Since the support of the magnet 13c is made by the bent portion 130, the rotor is easily manufactured.

In addition, a hub portion 132 having a through hole 131 is formed at the center of the rear wall portion 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.

Here, since the rotor frame is formed of a die-casting method of aluminum material, the manufacturing is simple, and rust is prevented and light, thereby minimizing the loss due to the inertia of the rotor frame and improving workability.

In addition, a through hole 136 is formed in a region between each of the cooling fins 133 and the cooling fins of the rear wall portion 13a of the rotor 13 to perform a passage function through which water is discharged and wind passes.

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, accordingly by fastening the fastening member (15c) to the fastening holes (137, 162) of the rotor (13) and connector (16). 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.

In addition, the connector 16 may be integrally formed by inserting the rotor frame and the insert, thereby simplifying the manufacturing process.

Meanwhile, the serration 164 is formed on the inner circumferential surface of the hub 161 of the connector 16 so that the rotor 13 is connected to the serration 400 formed at the rear end of the shaft 4 through the connector 16. Rotational force is transmitted to the shaft 4 as it is.

Here, a serration member formed of a metal material may be inserted into the connector 16 and the inner circumferential surface of the hub 201 in order to ensure the strength of the serration 164 and may be integrally formed with the connector.

In addition, a reinforcing rib 161 is formed outside the hub 201 of the connector 16 to reinforce the strength of the hub 201.

On the other hand, the outer side of the hub 201 formed on the rear wall 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 surface 200.

At this time, between the rear wall surface 200 and the stator 14 of the tub 2 is substantially the same shape as the outer shape of the rear wall surface 200, the rear wall surface 200 of the tub 2 when the stator 14 is fastened Since the supporter 17 fixed to) is interposed, 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 rear wall wall 200 In close contact with the stator 14 while supporting the stator 14, the concentricity of the stator is maintained.

In addition, the supporter and the bearing housing are integrally formed to insert injections when manufacturing the tub, excluding the need to separately assemble the tub, the supporter and the bearing housing on an assembly line, thereby simplifying the manufacturing process, and coupling strength between the tub and the stator. There is an effect to increase.

In addition, the bonding strength can be increased by combining the annular back yoke formed of the iron plate with the aluminum rotor frame in such a manner that the protrusion is inserted into the groove, and the bonding strength can be further increased by interposing the adhesive. have.

On the other hand, the present invention is not limited to the above-described embodiment, it is possible to change the dimensions, shape, material of course without departing from the scope of the technical idea of the present invention, as well as a drum type washing machine as well as a washing machine of the pulsator type Of course it could be applied.

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

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

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

In the washing machine of the present invention, the rotor frame may be formed of aluminum to prevent rust, thereby increasing durability of the motor.

In addition, since the rotor frame of the present invention has a magnet seating surface, workability is improved when the magnet is mounted, and through-holes having a volleyball function and a ventilation hole function are provided, thereby preventing overheating of the motor and influence due to moisture, thereby preventing the motor. The reliability can be improved and the life can be extended.

On the other hand, since the rotor frame is formed of a die-casting method of aluminum material, the manufacturing is simple, and the workability for post-processing can be improved, and since it is formed of a light material, the loss of the motor due to the inertia of the rotor frame can be minimized.

And, since the rotor frame is formed of aluminum, it can provide elasticity to vary the thickness of the back yoke according to the diversification of the product, and increase the overall thickness to prevent the flutter caused by the rotation of the rotor frame. Noise and vibration can be reduced.

In addition, since the back yoke is coupled to the rotor frame through grooves and protrusions, the coupling strength between the rotor frame and the back yoke can be increased.

Claims (8)

Tub and wash water is stored; A drum rotatably provided inside the tub to wash laundry by rotation; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; A stator having a coil wound around the stator and fixedly coupled to a rear wall of the tub; In the washing machine comprising an annular back yoke formed of a magnet and a magnetic path, and including an outer rotor rotatably provided on the outside of the stator, The outer rotor further comprises a rotor frame having a side wall portion for supporting the magnet and the back yoke, a rear wall portion for transmitting rotational force to the shaft, and formed by die casting of aluminum, The back yoke is inserted into the mold of the rotor frame during die casting of the rotor frame is fixed to the inside of the rotor frame side wall portion. The method of claim 1, The back yoke is inserted into the mold after the magnet is pre-coupled in the circumferential direction therein. The method of claim 2, Washer, characterized in that the groove or the projection is formed on the outside of the back yoke to increase the coupling force with the rotor frame. The method of claim 3, wherein Washing machine, characterized in that a plurality of grooves or projections of the back yoke is formed at predetermined intervals along the circumferential direction. The method of claim 4, wherein Grooves or protrusions of the back yoke is formed in the middle of the overall height of the back yoke. The method of claim 5, The side wall portion of the rotor frame is a washing machine, characterized in that the upper end is extended in a predetermined length radially inward so as to cover the upper end of the back yoke and the magnet. The method of claim 5, The back yoke, Washing machine, characterized in that formed in a multi-layer structure while rotating the band of the iron plate material having a width substantially the same as the thickness of the back yoke spirally from the bottom layer to the top layer. The method of claim 5, The back yoke, Washing machine, characterized in that the iron plate having a thickness thinner than the thickness of the back yoke is formed so as to have a predetermined thickness in an annular shape.

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