KR101576146B1 - Driving apparatus and washing machine - Google Patents

Abstract

The driving device of the washing machine of the present invention includes an outer shaft connected to a washing machine, an inner shaft rotatably disposed in the outer shaft and connected to the pulsator, an outer rotor connected to the inner shaft, And a stator disposed with an air gap between the outer rotor, wherein the washing tub is connected to one end of the outer shaft and the inner rotor is connected to the other end to directly connect the inner tub with the inner rotor, And the outer rotor is connected to the other end to directly connect between the pulsator and the outer rotor to reduce the manufacturing cost and simplify the manufacturing process and reduce the height of the washing machine .

Description

[0001] DRIVING APPARATUS AND WASHING MACHINE [0002]

The present invention relates to a driving apparatus for a washing machine and a washing machine having the same, which can drive a washing tub and a pulsator, respectively, without a separate intermediate medium, directly connected to the washing tub and pulsator.

[0002] A conventional washing machine includes an outer case having an outer shape, an outer tub supported in the outer case to receive washing water therein, The washing machine according to any one of claims 1 to 3, further comprising: an inner tub for washing and dewatering housed rotatably in the inner tub; a pulsator for forming washing water in a relatively rotatable manner inside the inner tub; A pulsator rotation shaft that receives the driving force of the driving motor to rotate the pulsator, and a pulsator rotation shaft that is connected to the pulsator rotation shaft A plurality of planetary gears that are engaged with the sun gear and the ring gear at the same time, a carrier that rotatably and processably supports the planetary gear, And a clutch spring for controlling the rotation of the inner tub and the pulsator when the outer tub is depressed or dehydrated.

Such a conventional washing machine is provided with a planetary gear set composed of a sun gear, a ring gear, a planetary gear, and a carrier so as to transmit the rotational force of the driving motor to the pulsator and the inner tank, To rotate only the pulsator or to rotate the pulsator and inner tub simultaneously.

However, the conventional washing machine requires a planetary gear set, a clutch spring, and the like in order to selectively rotate the pulsator and the inner tank, so that the configuration is complicated and the manufacturing cost increases.

In addition, in the conventional washing machine, since the planetary gear set and the clutch spring are installed between the driving motor and the outer tub, the space occupied in the height direction of the washing machine becomes large, and when the height of the washing machine is increased, There is a problem that the washing capacity is reduced because the height is reduced.

In addition, in the conventional washing machine, the pulsator and the inner tub can rotate in the same direction, and the pulsator and the inner tub can not be rotated in opposite directions.

Korean Patent Registration No. 10-0548310 (Jan. 24, 2006)

An object of the present invention is to provide a driving device for a washing machine and a washing machine having the same that can reduce the manufacturing cost and simplify the manufacturing process and can reduce the height of the washing machine.

It is another object of the present invention to provide a driving apparatus for a washing machine and a washing machine having the same capable of rotating the pulsator and the washing tub simultaneously in different directions to improve the performance of the washing machine.

Another object of the present invention is to simplify the structure because the outer shaft directly connects the inner rotor and the pulsed tier, and the inner shaft directly connects the outer rotor and the washing tank, and the power is directly transmitted without a separate intermediate medium, And a washing machine having the washing machine.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. .

The driving device of the washing machine of the present invention includes an outer shaft connected to a washing machine, an inner shaft rotatably disposed in the outer shaft and connected to the pulsator, an inner rotor connected to the outer shaft, And a stator disposed with an air gap between the inner rotor and the outer rotor, wherein the outer shaft is connected to the washing tub at one end thereof and the inner rotor is connected to the other end thereof to directly connect the inner tub to the inner rotor, A pulsator is connected to one end of the inner shaft, and an outer rotor is connected to the other end of the inner shaft to directly connect the pulsator and the outer rotor.

The outer shaft of the present invention is rotatably supported by a first bearing and a second bearing, wherein the first bearing is fixed to a first bearing housing, the second bearing is fixed to a second bearing housing, The housing and the second bearing housing can be fixed to the outer tank.

A first seal is mounted between the bearing housing and the outer shaft of the present invention and a second seal is mounted between the outer shaft and the inner shaft to prevent leakage of wash water.

The outer shaft of the present invention is formed in a hollow shape and includes a first shaft having a first connecting portion formed on an outer circumferential surface thereof to be connected to an inner rotor housing, a second connecting portion And the second shaft may be formed.

The inner shaft of the present invention is formed with a third connecting portion, the lower side of which is drawn out from the lower end of the outer shaft and is connected to the outer rotor housing, the upper side of which is drawn out from the upper end of the yater shaft, And a second fixing nut for fixing the outer rotor housing may be fastened to the lower end of the inner shaft.

The washing machine according to the present invention comprises: an outer tub supported in a suspended state inside a case to receive washing water; a washing tub rotatably arranged inside the tub, performing washing and dewatering; And a driving device for simultaneously or selectively driving the washing tub and the pulsator, wherein the driving device comprises: an outer shaft connected to the washing tub; a pulsator arranged rotatably inside the outer shaft; An inner rotor connected to the outer shaft; an outer rotor connected to the inner shaft; and a stator disposed with an air gap between the inner rotor and the outer rotor, wherein the outer shaft is disposed at one end And the inner rotor is connected to the other end of the washing tub and the inner rotor Directly to it, and the inner shaft is a pulsator connected to one end, the outer rotor is connected to the other terminal is characterized in that a direct connection between the pulsator and the outer rotor.

As described above, the driving apparatus of the washing machine of the present invention can reduce the manufacturing cost and simplify the manufacturing process by directly connecting the driving motor, the pulsator and the washing tank to remove the clutch and the planetary gear set, And the washing capacity can be increased while lowering the height of the washing machine.

The pulsator is rotated when only the outer rotor is driven. When the inner rotor is driven, only the washing tub is rotated. When the outer rotor rotates only the inner rotor, The pulsator and the washing machine can be rotated in different directions at the same time when power is applied to the outer rotor and the inner rotor in mutually opposite directions, thereby improving the performance of the washing machine.

In the driving apparatus of the washing machine of the present invention, since the outer shaft directly connects between the inner rotor and the pulsed tier, and the inner shaft directly connects the outer rotor and the washing tank, the power is directly transmitted without a separate intermediate medium The power loss can be minimized, and the performance of the washing machine can be improved.

1 is a sectional view of a washing machine according to an embodiment of the present invention.
2 is a sectional view of a driving apparatus for a washing machine according to an embodiment of the present invention.
3 is a cross-sectional view of an inner shaft and an outer shaft according to an embodiment of the present invention.
4 is a cross-sectional view of an outer shaft according to another embodiment of the present invention.
5 is a cross-sectional side view of a driving apparatus according to an embodiment of the present invention.
6 is a plan view of a stator according to an embodiment of the present invention.
7 is a plan view of a stator core according to an embodiment of the present invention.
8 and 9 are perspective views illustrating connection portions of a stator core according to another embodiment of the present invention.
10 is a side view showing a process of winding a coil on a stator core according to an embodiment of the present invention.
11 is a plan view in which a stator core according to an embodiment of the present invention is arranged in a radial direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

FIG. 1 is a sectional view of a washing machine according to an embodiment of the present invention, and FIG. 2 is a sectional view of a washing machine driving apparatus according to an embodiment of the present invention.

1 and 2, a washing machine according to an embodiment of the present invention includes an outer case 100, an outer tub 110 suspended inside the case 100 to receive washing water, A pulsator 130 rotatably disposed in the washing tub 120 to perform washing and dewatering operations, a pulsator 130 rotatably disposed in the washing tub 120 to form washing water, And a driving unit 140 installed at a lower portion of the washing tub 120 to selectively or simultaneously drive the washing tub 120 and the pulsator 130.

2, the driving unit 140 includes an outer shaft 20 connected to the washing tub 120, an inner shaft 20 rotatably disposed in the outer shaft 20 and connected to the pulsator 130, An inner rotor 40 connected to the outer shaft 20, an outer rotor 50 connected to the inner shaft 30, an inner rotor 40, And a stator 60 disposed with an air gap between the outer rotor 50.

A first bearing 70 and a second bearing 72, which rotatably support the outer shaft 20, are disposed on the outer circumferential surface of the outer shaft 20 at regular intervals.

The first bearing 70 is supported by the first bearing housing 10 and the second bearing 72 is supported by the second bearing housing 56. The first bearing housing (10) and the second bearing housing (56) are fixed to the outer tub (110).

3, the outer shaft 20 is formed in a cylindrical shape to allow the inner shaft 30 to pass therethrough. The outer shaft 20 has a first shaft 22 to which the interrotor 40 is coupled, a first shaft 22, And a second shaft 24 connected to the upper side of the washing tub 120 and coupled to the washing tub 120.

A press-fit groove 26 into which the lower end of the second shaft 24 is press-fitted is formed on the inner surface of the upper end of the first shaft 22, and a stepped portion 28 whose outer diameter is reduced is formed on the intermediate- The first bearing 70 is mounted on the first bearing 28 to prevent the first bearing 70 from vertically moving.

A first connection portion 210 is formed below the portion of the first shaft 22 on which the first bearing 70 is mounted so that the inner rotor housing 42 of the inner rotor 40 is fixed. A first fixing nut 74 for fixing the inner rotor housing 42 to the first shaft 22 is fastened to the lower side of the inner rotor housing 210.

Here, the first bearing 70 is inserted into the stepped portion 28 formed on the outer circumferential surface of the first shaft 22, the inner rotor housing 42 is connected by the first connecting portion 210, When the nut 74 is fastened, the assembly is completed, so that the assembly is simple. The first bearing 70 is inserted into the stepped portion 28 and prevented from flowing and the inner rotor housing 42 is prevented from being separated from the first shaft 22 by the first fixing nut 74 .

The lower end of the second shaft 24 is press-fitted into the press-fit groove 26 of the first shaft 22 to be connected to the first shaft 22, the second bearing 72 is inserted into the outer circumferential surface thereof, The upper portion of the upper surface of the portion where the bearing 72 is inserted is formed with a second connection portion 220 connected to the coupling portion 122 formed at the center of the washing tub 110.

The first connection part 210 and the second connection part 220 may have a structure in which serration is formed on the outer surface of the first shaft 22 so as to be splined to each other, Lt; / RTI >

The first connecting portion 210 and the second connecting portion 220 may have any structure as long as the inner rotor housing 42 and the washing tub 110 can be connected to the outer surface of the first shaft 22, It is possible.

The inner shaft 30 is rotatably disposed on the inner surface of the outer shaft 20 and the lower end of the inner shaft 30 is drawn out from the lower end of the outer shaft 20 to form a third connecting portion 280 to which the outer rotor housing 52 is connected , And a second fixing nut (76) for preventing the outer rotor housing (52) from being detached is fastened at the lower end. The upper end of the inner shaft 30 is drawn out from the upper end of the outer shaft 20 to form a fourth connecting portion 290 to which the pulsator 130 is connected.

Here, the third connection part 280 and the fourth connection part 290 form a serration on the outer surface of the inner shaft 30, the outer rotor housing 52 and the pulsator 130, Spline-coupled structure, and may have a structure in which a keyway is formed and key-coupled with each other.

A first sleeve bearing 80 and a second sleeve bearing 82 are fixed to the upper inner circumferential surface and the lower inner circumferential surface of the outer shaft 20 respectively and the first sleeve bearing 80 and the second sleeve bearing 82 are provided with inner shafts 80, (30) is rotatably supported.

A separation preventing ring 84 is coupled to the upper outer circumferential surface of the inner shaft 30, and the separation preventing ring 84 prevents the first sleeve bearing 80 from coming off.

4 is a cross-sectional view of an outer shaft according to another embodiment of the present invention.

The outer shaft 20 according to another embodiment has a hollow shape so that the inner shaft 30 can be rotatably supported therein and a first connection portion A second connecting portion 220 is formed on the upper outer circumferential surface to connect the washing tub 120 and an outer diameter enlarging portion 23 having an increased outer diameter is formed at the center.

The first stepped portion 25 and the second stepped portion 27 are formed at the lower end and the upper end of the outer diameter enlarged portion 23 and the first bearing 70 is supported at the first stepped portion 25. [ Thereby preventing the first bearing 70 from flowing and the second stepped portion 27 being supported by the second bearing 72 to prevent the second bearing 72 from flowing.

The outer shaft 20 described in the above embodiment is separated into the first shaft 22 and the second shaft 24 while the outer shaft 20 according to another embodiment has a structure formed by one.

The first bearing housing 10 is formed of a resin material and has a bearing mounting portion 12 on the inner surface thereof for mounting a first bearing. A stator 60 is fixed to the center of the bearing mounting portion 12 at regular intervals in the circumferential direction And a second fastening hole 16 is formed at the outer edge of the outer tub at a predetermined interval in the circumferential direction and fastened by bolts 46 to the outer tub.

The second bearing housing 56 is formed of a metal material and has a bearing mounting portion 230 formed at the center of the opening and on which the second bearing 72 is mounted and a bearing mounting portion 230 bent upward in the bearing mounting portion 230, And a third fastening hole 18 which is bent downward in the seal mounting portion 240 and fastened to the outer tub 110 by bolts 46. The external fastening portion 280 ).

A fourth fastening hole 19 is further formed on the outer side of the third fastening hole 18 of the second bearing housing 56 and a bolt 48 is fastened to the outer tub 110 through the fourth fastening hole 19. [ So that the second bearing housing 56 can be more firmly fixed to the outer tank.

An opening is formed at the center of the outer tub 110. The second bearing housing 56 is passed through the opening of the outer tub 110 to be brought into contact with the back face of the outer tub 110, The first bearing housing 10 is stacked and then fastened to the outer tub 110 by a single bolt 46.

That is, the first bearing housing 10 and the second bearing housing 56 are stacked on the back surface of the outer tub 110, and then the second coupling hole 16 of the first bearing housing 10 and the second bearing housing 56 The bolts 46 are passed through the third fastening holes 18 of the first bearing housing 10 and the second bearing housing 56 with one bolt 90 by fastening the bolts 46 to the outer tank 110. [ Can be fastened to the outer tub 110 at the same time, so that the assembling property can be improved.

A first seal 260 is installed between the second bearing housing 56 and the outer surface of the outer shaft 20 to prevent wash water from leaking out. The inner surface of the upper shaft of the outer shaft 20, A second seal (270) for preventing wash water from leaking is mounted between the outer surfaces.

The inner rotor 40 includes an inner rotor housing 42 and a first magnet 44 fixed to the outer surface of the inner rotor housing 42. The inner rotor housing 42 is formed in the shape of a disk having an opening at its center. A first magnet 44 is fixed to the outer surface of the inner rotor housing 42, and an inner surface of the inner rotor housing 42 is connected to the first connecting portion 210 of the outer shaft.

The outer rotor 50 includes an outer rotor housing 52 and a second magnet 54 which is fixed to the inner surface of the outer side of the outer rotor housing 52 and faces the outer surface of the stator 60 with a predetermined gap therebetween . The outer rotor housing 52 has a second magnet 54 fixed to its outer inner surface and an inner surface thereof connected to a third connecting portion 280 of the inner shaft 30.

Here, the inner rotor housing 42 and the outer rotor housing 52 are preferably formed of a material for forming a magnetic path so as to form a magnetic path without a back yoke.

FIG. 5 is a cross-sectional view of a stator according to an embodiment of the present invention, FIG. 6 is a cross-sectional view of a stator core according to an embodiment of the present invention, and FIG.

The stator 60 includes a plurality of stator cores 62 arranged in a radial direction, a bobbin 64 as a non-magnetic body wrapped around the outer circumferential surface of the stator core 62, a first coil 62 wound on one side of the stator core 62, A second coil 68 wound on the other side of the stator core 62;

Here, since the first power source is applied to the first coil 66 and the second power source is applied to the second coil 68, when only the first coil 66 is powered, only the inner rotor 40 rotates When power is applied only to the second coil 68, only the outer rotor 50 is rotated. When the first coil 66 and the second coil 68 are simultaneously powered, the inner rotor 40 and the outer rotor 50 are simultaneously rotated.

The stator core 62 includes a first tooth portion 310 on which the first coil 66 is wound and a second tooth portion on the opposite side of the first tooth portion 310 to which the second coil 68 is wound 312 formed between the first tooth portion 310 and the second tooth portion 312 and between the cores 62 formed at both lateral ends of the partition portion 314; 322 for interconnecting the first and second connectors 321, 322.

A first flange portion 316 is formed at the end of the first tooth portion 310 so as to face the first magnet 44. A second magnet portion 54 is formed at an end portion of the second tooth portion 312, And a second flange portion 318 disposed to face the second flange portion 318. [

The first flange 316 and the second flange 318 are disposed inward and outward at a predetermined curvature corresponding to the first magnet 44 of the inner rotor 40 and the second magnet 54 of the outer rotor 50, It forms an outward curved surface. Therefore, since the roundness of the inner circumferential surface and the outer circumferential surface of the stator core 62 becomes high, the inner circumferential surface and the outer circumferential surface of the stator 60 are close to the first magnet 44 and the second magnet 54, Lt; / RTI >

A through hole 332 through which the fixing bolt 330 passes is formed in the center of the stator core 62, that is, in the partition 314.

Here, the bolt 330 is passed through the through hole 332 and is fastened to the first fastening hole 14 formed in the first bearing housing 10 to fix the stator core 62 to the first bearing housing 10 .

That is, after the stator core 62 is arranged in the circumferential direction in the first bearing housing 10, the fixing bolt 330 is passed through the through hole 332 formed in the stator core 62, and then the first bearing housing 10 The stator core 62 can be annularly arranged and fixed.

When the stator core 62 is arranged in the first bearing housing 10 at regular intervals in the circumferential direction and then fastened by the fixing bolts 330, the assembling is completed, and the first bearing housing 10 is fixed to the outer tank 110 and the bolts 46 so that the components and the assembling process for arranging the existing stator core in an annular shape and the parts for assembling the stator and the assembling process are unnecessary and the assembling process can be reduced, Can be saved.

As described above, the fastening structure between the stator core 62 and the first bearing housing 10 can be integrally formed by insert molding, in addition to the structure fastened by the fixing bolts 330.

The stator cores 22 should have a structure directly connected to each other so as to form a magnetic circuit. Therefore, the engaging portions 320 and 322 have a structure in which the stator cores 22 are directly connected to each other.

The coupling portions 320 and 322 may be formed in a manner such that the coupling protrusions 322 protrude from one side of the partition portion 16 and the coupling protrusions 322 are fitted to the other side of the partition portion 314 So that the stator cores 62 are radially arranged and have a structure directly connected to each other when the engaging projections 322 are fitted into the engaging grooves 320. [

8, a pinhole 90 is formed at both ends of the partition 314 of the stator core, and in the state where the cores 62 are in contact with each other, It is also possible to apply a structure in which the cores 92 are interposed between the pinholes 90 of the two cores so as to connect the cores 22 together. As shown in FIG. 9, A method of caulking using the caulking member 94 is also applicable.

The bobbin 64 is fixed to the first flange portion 316 and the second flange portion 318 of the stator core 62 such that the first flange portion 316 and the second flange portion 318 of the stator core 62 are exposed to react with the first magnet 44 and the second magnet 54, And the second flange portion 318 and the second flange portion 318 are wrapped around the outer circumferential surface of the other stator core 62. That is, the bobbin 64 is formed on the outer peripheral surface of the stator core 62 by insert molding, and insulates the stator core 62 from the first coil 66 and the second coil 68.

The driving device of the present invention is such that the first magnetic circuit L1 is formed between the inner rotor 40 and one side of the stator 60 wound with the first coil 66 and the outer rotor 50, Since the second magnetic circuit L2 is formed between the other side of the stator 60 wound with the rotor 68 and the pair of magnetic circuits independent of each other are formed, the inner rotor 40 and the outer rotor 50 are driven separately .

Specifically, the first magnetic circuit L1 includes an N pole first magnet 44, a first tooth portion 310 around which the first coil 66 is wound, an inner portion of the partition portion 314, Through the first magnet (44) and the inner core housing (42) of the S pole adjacent to the first magnet (44).

The second magnetic circuit L2 includes a second tooth portion 312 which opposes the second magnet 54 of the N pole and the second magnet 54 of the N pole and in which the second coil 68 is wound, The second magnet 54 of the S pole, and the outer rotor housing 52 via the outer portion of the rotor 314.

The stator manufacturing process according to the embodiment of the present invention thus constructed will be described below.

FIG. 10 is a side view showing a process of winding a coil on a stator core according to an embodiment of the present invention, and FIG. 11 is a plan view in which a stator core according to an embodiment of the present invention is arranged in a radial direction.

First, the stator core 62 is formed by laminating a plurality of pieces of steel and then performing insert molding so that the bobbin 64 is wrapped around the outer circumferential surface of the stator core 62.

Thereafter, a coil winding process is performed in which the first coil 66 is wound on the first tooth portion 310 of the stator core 62 and the second coil 68 is wound on the second tooth portion 312 do.

In the coil winding process, the stator cores 62 are aligned in a line. That is, the first tooth portion 310 and the second tooth portion 312 are aligned horizontally in a line, and the stator cores 62 are fixed to be aligned horizontally by using the core alignment jig 172. Here, the core connecting jig 172 is preferably a magnet jig to which the stator core 62 is attached on both sides so as to fix the gap between the stator cores 62 by using a magnetic force.

When the alignment of the stator cores 62 is completed, the first coil 66 is wound on the outer circumferential surface of the first tooth portion 310 and the outer circumferential surface of the second tooth portion 312 is wound And the second coil 68 is wound. At this time, the two coils of the first coil 66 and the second coil 68 are wound on the first and second tooth portions 310 and 312, respectively.

Since the first tooth portion 310 and the second tooth portion 312 are partitioned by the partition portion 314 of the stator core 62, the first coil 66 wound on the first tooth portion 310, And the second coil 68 wound on the second tooth portion 312 may be wound in a state where they are separated from each other.

Then, when the winding of one stator core 62 is completed, the cores 62 disposed adjacent to each other are continuously and continuously coiled. The first coil 66 is wound on the outer circumferential surface of the first tooth portion 310 of the continuously disposed adjacent core 62 and the second coil 68 is wound on the outer circumferential surface of the second tooth portion 312, Lt; / RTI > Since the first coil 66 is connected to the first jump line 162 and the second coil 68 is connected to the second jump line 164, Lt; / RTI >

The above process is repeated to continuously wind the coils to the plurality of stator cores 62, and three sets of core assemblies corresponding to the U, V, W phases in the three-phase case are manufactured.

In the coil winding method according to the present embodiment, when the first coil 66 is wound on the outer circumferential surface of the first tooth portion 310, the second coil 68 is wound around the outer circumferential surface of the second tooth portion 312 Since the first coil 66 and the second coil 68 are wound simultaneously, the productivity can be improved and the manufacturing time can be shortened.

When the core assembly is manufactured in such a manufacturing process, as shown in FIG. 10, the divided cores of U, V, and W phases are alternately arranged in turn for each phase. At this time, since the stator cores 62 for each phase are connected by the jump lines 162 and 164, even if the gap between the core assemblies is wide when the three-phase core assemblies are alternately arranged, it can sufficiently cope with them.

When the plurality of core assemblies are radially arranged and then fastened to the frame 10 with the bolts 330, assembly of the stator is completed.

At this time, since the bolts 330 pass through the through holes 332 formed in the stator core 62 and are fastened to the fastening holes 14 of the frame 10, the assembling process can be simplified. After the stator core 62 is radially arranged in the mold, the frame 10 can be integrally formed by insert injection.

The operation of the apparatus for driving the washing machine according to an embodiment of the present invention will be described below.

The outer rotor 50 is rotated and the inner shaft 30 connected to the outer rotor 50 is rotated to rotate the pulsator 130. In this case, And rotates the data 130.

When the pulsator 130 and the dewatering tank 120 are simultaneously rotated during dewatering and rinsing, power is simultaneously applied to the first coil 66 and the second coil 68. The inner rotor 40 is rotated by the magnetic circuit L1 and the outer shaft 20 connected to the inner rotor 40 is rotated to rotate the washing tub 120. [ The outer rotor 50 is rotated by the magnetic circuit L2 and the inner shaft 30 connected to the outer rotor 50 is rotated to rotate the pulsator 130.

When the pulsator 130 and the washing tub 120 are rotated in opposite directions to remove the loosening process and the laundry tangling, the first coil 66 and the second coil 68 are powered in opposite directions . Then, the pulsator 130 and the washing tub 120 are rotated in opposite directions while the inner rotor 40 and the outer rotor 50 are rotated in opposite directions to each other.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

10: first bearing housing 20: outer shaft
22: first shaft 24: second shaft
30: Inner shaft 40: Inner rotor
42: inner rotor housing 44: first magnet
50: outer rotor 52: outer rotor housing
54: second magnet 56: second bearing housing
60: stator 62: stator core
64: bobbin 66: first coil
68: second coil 70: first bearing
72: second bearing 80: first sleeve bearing
74: first fixing bolt 76: second fixing bolt
82: second sleeve bearing 100: case
110; Outer bath 120: washing tub
130: pulsator 210: first connection part
220: second connection part 280: third connection part
290: fourth connection portion

Claims (10)

An outer shaft connected to the washing tub;
An inner shaft rotatably disposed inside the outer shaft and connected to the pulsator;
An inner rotor connected to the outer shaft;
An outer rotor connected to the inner shaft; And
And a stator having a stator core in which a coil is wound, the stator having an air gap between the inner rotor and the outer rotor,
Wherein the outer shaft is connected to the washing tub at one end thereof and the inner rotor is connected to the other end thereof to directly connect the washing tub to the inner rotor,
The inner shaft has a pulsator connected to one end thereof and an outer rotor connected to the other end thereof to directly connect the pulsator and the outer rotor,
The outer shaft is formed in a hollow shape and includes a first shaft having a first connection portion formed at an outer circumferential surface thereof to be connected to an inner rotor housing, a second connection portion press-fitted into an upper end of the first shaft, And the second shaft is connected to the second shaft. The method according to claim 1,
Wherein the outer shaft is rotatably supported by a first bearing and a second bearing, the first bearing is fixed to a first bearing housing, the second bearing is fixed to a second bearing housing, and the first bearing housing and the second bearing housing are rotatably supported by a first bearing and a second bearing, And the second bearing housing is fixed to the outer tub. 3. The method of claim 2,
Wherein a first seal is mounted between the bearing housing and the outer shaft and a second seal is mounted between the outer shaft and the inner shaft to prevent leakage of wash water. delete The method according to claim 1,
The first shaft is formed with a press-fit groove in which a second shaft is press-fitted into an inner surface of the upper end, a stepped portion is formed on a lower outer circumferential surface, a first bearing is supported on the stepped portion, and a first connection portion to which the inner rotor housing is connected And a first fixing nut for fixing the inner rotor housing is fastened. The method according to claim 1,
The inner shaft is formed with a third connecting portion, the lower side of which is drawn out from the lower end of the outer shaft and the outer rotor housing is connected to, a fourth connecting portion is formed on the upper side of the inner shaft,
And a second fixing nut for fixing the outer rotor housing is fastened to the lower end of the inner shaft. The method according to claim 1,
Wherein the stator includes a stator core around which a coil is wound,
The stator core includes a first tooth portion around which the first coil is wound,
A second tooth portion formed on the opposite side of the first tooth portion and wound with the second coil,
A partition part for partitioning the first tooth part and the second tooth part,
And a coupling portion formed at both ends of the partition portion and interconnecting the stator cores. 8. The method of claim 7,
Wherein the engaging portion includes an engaging projection formed on one side of the partition and an engaging groove formed on the other side of the partition to engage with the engaging projection. 3. The method of claim 2,
Wherein the stator core is formed with a through hole at a center thereof and the fixing bolt is fastened to the first fastening hole formed in the first bearing housing through the through hole. The washing machine according to any one of claims 1 to 3, further comprising: an outer tub which is suspended inside the case to receive the washing water; a washing tub disposed rotatably inside the tub for washing and dewatering; And a driving device for simultaneously or selectively driving the washing tub and pulsator,
The driving device may include an outer shaft connected to the washing tub;
An inner shaft rotatably disposed inside the outer shaft and connected to the pulsator;
An inner rotor connected to the outer shaft;
An outer rotor connected to the inner shaft; And
And a stator disposed with an air gap between the inner rotor and the outer rotor,
Wherein the outer shaft is connected to the washing tub at one end thereof and the inner rotor is connected to the other end thereof to directly connect the washing tub to the inner rotor,
The inner shaft has a pulsator connected to one end thereof and an outer rotor connected to the other end thereof to directly connect the pulsator and the outer rotor,
The outer shaft is formed in a hollow shape and includes a first shaft having a first connection portion formed at an outer circumferential surface thereof to be connected to an inner rotor housing, a second connection portion press-fitted into an upper end of the first shaft, And a second shaft connected to the first shaft.

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