KR101861274B1 - A shaft structure of a washing machine having a dual-drum and a washing machine thereof - Google Patents

Abstract

[0001] The present invention relates to a shafting structure of a washing machine having a dual drum structure, in which a spring washer and a C-ring are fixed to a connection structure of an inner rotor and an outer shaft rotated by inner rotors of a dual motor, The present invention relates to a shafting structure of a dual drum washing machine in which a reduction in material cost, prevention of abnormal noise, and prevention of loosening due to vibration is achieved.
Accordingly, the present invention provides a hollow outer shaft; An inner shaft penetrating the inside of the outer shaft; And a stator, an outer rotor connected to the inner shaft and rotated on the outer side of the stator, and an inner rotor connected to the outer shaft and rotated inside the stator; And a spring washer inserted into a connection portion between the outer shaft and the inner rotor to prevent vibrations of the outer shaft to prevent noise and to prevent the vibration of the outer shaft due to vibration. do.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dual drum type washing machine,

[0001] The present invention relates to a shafting structure of a washing machine having a dual drum structure, in which a spring washer and a C-ring are fixed to a connection structure of an inner rotor and an outer shaft rotated by inner rotors of a dual motor, The present invention relates to a shafting structure of a dual drum washing machine in which a reduction in material cost, prevention of abnormal noise, and prevention of loosening due to vibration is achieved.

Generally, in a washing machine, a washing object in a drum is forcibly flowed by using a mechanical force such as a friction between a rotating drum and laundry to receive a driving force of a driving motor in a state in which detergent, washing water and washing object are put in the drum. So that the laundry is subjected to a physical action such as friction or impact so that the laundry is washed. Further, the detergent is brought into contact with the object to be cleaned so that the object is washed by a chemical action. Further, the chemical action of the detergent is promoted by the flow of the laundry in the drum.

In recent years, a rotary drum of a drum type washing machine is formed in a horizontal direction. Of course, the rotational axis of the drum may be given a predetermined angle with respect to the horizontal direction. The drum washing machine in which the rotating shaft is in the horizontal direction causes the laundry to flow in the circumferential direction along the inner peripheral surface of the drum.

The object to be laundered flows along the inner circumferential surface of the drum due to the friction between the inner circumferential surface and the centrifugal force caused by the rotation of the drum. A lifter for assisting the flow of the laundry may be provided on the inner circumferential surface of the drum. Here, depending on the rotational speed of the drum, the object to be cleaned may be circularly moved along the inner circumferential surface, or may be dropped by gravity at the upper portion of the drum. Such a falling motion is a factor that greatly influences the washing effect.

The flow of the laundry within the drum greatly affects the washing effect. In detail, the various flows of the laundry subject to the laundry vary the contact surface of the laundry to be rubbed against the inner circumferential surface of the drum so that the laundry can be evenly washed. In addition, the physical force acting on the laundry object is increased to increase the washing effect.

In the conventional drum type washing machine, the drum shaft connecting structure has a structure in which all of the drum shaft connecting structures are fixed by using a nut. In this structure, the nut may be loosened due to high speed rotation or abnormal noise may be generated due to vibration .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a dual-drum washing machine capable of preventing unpleasant noise and vibration caused by a connection structure between an inner rotor and an outer shaft of a dual- And to provide a washing machine using the dual drum type washing machine.

In order to achieve the above-mentioned object, the present invention will be realized by an embodiment having the following constitution as a preferred embodiment. The present invention provides the following technical constructions to solve the above problems.

One embodiment of the washing machine of the present invention comprises: a hollow outer shaft; An inner shaft penetrating the inside of the outer shaft; And a stator, an outer rotor connected to the inner shaft and rotated on the outer side of the stator, and an inner rotor connected to the outer shaft and rotated inside the stator; And a spring washer inserted into a connection portion between the outer shaft and the inner rotor to prevent vibrations of the outer shaft by vibrating to prevent noise.

Further, the present invention may further include a stop ring for fixing the spring washer on a connection portion between the outer shaft and the inner rotor, and the stop ring may be formed as a C-ring.

In the present invention, the outer shaft includes a stop ring groove recessed in the center direction, so that the C-ring is inserted into the stop ring groove to prevent the spring washer from being displaced in the axial direction.

According to another embodiment of the present invention, an inner bushing is provided between the outer shaft and the inner rotor so that the rotational force of the inner rotor is transmitted to the outer shaft.

In order to prevent axial vibration and noise of the outer shaft, the spring washer is installed at a connection portion between the inner bushing and the outer shaft, and a stop ring for fixing the spring washer on the connection portion of the outer shaft and the inner bushing. Wherein the spring washer comprises an annular member on an upper surface of the inner bushing to surround the outer circumference of the outer shaft.

Further, the stop ring is formed of a C-ring, which is inserted into a stop ring groove formed to be recessed in the center direction from the outer periphery of the outer shaft, and contacts the upper surface of the spring washer, .

The spring washer is formed of an annular concave-convex member having a protruding portion and a depressed portion, and an inner ball bearing is provided between the outer shaft and the inner shaft so that the driving motor independently drives the outer shaft and the inner shaft .

According to another embodiment of the present invention, the inner shaft includes a serration coupled with an outer rotor at an outer periphery of a driving motor-side end, and the outer rotor includes a serration- Wherein the serration of the inner shaft and the through hole of the outer bushing are formed in an inclined tapered shape so as to improve the ease of coupling and the coupling force.

According to another embodiment of the present invention, there is provided a display device comprising: a body forming an appearance; A tub disposed inside the main body; A main drum rotatably mounted in the tub; A sub drum mounted inside the main drum to be rotatable relative to the main drum; A hollow outer shaft connected to the main drum; An inner shaft connected to the sub drum inside the outer shaft; And an inner rotor connected to the inner shaft and rotated at an outer side of the stator, and an inner rotor connected to the outer shaft and rotated at an inner side of the stator, wherein the outer rotor and the inner rotor, And a stop ring for fixing the spring washer to prevent noise of the outer shaft and to prevent it from being loosened by vibration.

According to the present invention, an inner bushing is provided between the outer shaft and the inner rotor so that the rotational force of the inner rotor is transmitted to the outer shaft, and the spring washer is provided at a connection portion between the outer shaft and the inner bushing So as to buffer the axial vibration of the outer shaft.

And an inner bearing which is press-fitted into the inner shaft in the outer shaft.

The spring washer is an annular concave-convex member having a protruding portion and a depression formed therein. The spring washer is fitted to the outer circumference of the outer shaft and is press-fitted to the upper surface of the inner bushing. The stop ring is formed of a C- And is constrained in the axial direction from the outer periphery of the outer shaft.

The stop ring is fixed in the axial direction by being fitted in a stop ring groove recessed in the center direction on the outer circumferential surface of the outer shaft so as to prevent the spring washer from being displaced in the axial direction and to provide axial spring elasticity do.

INDUSTRIAL APPLICABILITY As described above, the present invention can achieve the following effects according to the above-described problem solving means and the construction and operation to be described later.

INDUSTRIAL APPLICABILITY The present invention improves the shafting structure of a dual drum and dual motor type washing machine and adopts a more simplified structure to buffer the vibration between the inner rotor and the outer shaft to prevent abnormal noise and prevent the shaft from loosening .

1 is a schematic view showing a washing machine according to an embodiment of the present invention;
2 is a cross-sectional view showing an inner shaft and an outer shaft in the shaft structure of the present invention.
3 is an external perspective view showing the shaft structure of the present invention.
4 is a view showing a spring washer used in the shaft structure of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a dual-drum washing machine according to the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as being limited to ordinary or dictionary terms, and the inventor should appropriately define the concept of the term to describe its invention in the best way The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

1 is a schematic view of a washing machine according to an embodiment of the present invention. Referring to FIG. 1, a washing machine according to an embodiment of the present invention includes a cabinet 10 constituting an outer shape of a device corresponding to the main body. In the front of the cabinet 10, a charging port 20 for charging laundry, which is an object to be cleaned, into the cabinet 10 is formed.

 The inlet 20 is opened and closed by a door rotatably fixed to the cabinet. A control panel 30 having various operation buttons for operating the washing machine is located above the cabinet, and a detergent supply device (not shown) is provided at one side of the control panel 30 to insert detergent or the like .

The main tub 50 is rotatably installed in the tub and the main drum 50 and the sub drum 60 are installed in the cabinet 10, . And a driving motor 70 for driving the main and sub drums is provided at a rear portion of the tub.

The tub 40 has a cylindrical configuration and can house the main drum 50 and the sub drum 60 therein. The front surface of the tub 40 is opened to be connected to the open inlet 20 of the cabinet described above. Therefore, a gasket surrounding the front portion of the tub and the vicinity of the inlet of the cabinet is provided between the front portion of the tub and the inlet of the cabinet. This is to prevent the washing water contained in the tub from flowing into the cabinet.

The main drum 50 is a cylindrical structure rotatably mounted in the tub. A plurality of through holes may be formed in the side surface of the main drum 50 to allow the washing water to escape.

The sub-drum 60 is of a cylindrical configuration rotatably mounted in the main drum 50. Here, the sub-drum 60 is mounted to be rotatable relative to the main drum. That is, the main drum and the sub drum can be driven independently of each other, and various relative rotations can be performed according to the rotational speed and the rotational direction of the respective drums.

The driving motor 70 is a device for generating a driving force for driving the main drum and the sub drum. The driving motor 70 is mounted on the rear surface of the tub 40. The driving motor 70 includes a fixed stator 71, an outer rotor 72 rotated on the outer side of the stator, and an inner rotor 73 rotated on the inner side of the stator. A drive motor having these two rotors may be referred to as a dual-rotor motor for convenience's sake.

The stator 71 has an annular structure to surround the inner rotor 73 and is fixed to the turbine side. The stator has an inner winding portion and an outer winding portion on a core in which an iron core is laminated.

The inner rotor 73 is rotatably disposed inside the stator and is connected to an outer shaft 81 to be described later to be engaged with rotation of the main drum 50. The outer rotor 72 is rotatably provided on the outer side of the stator and is connected to an inner shaft 82 to be described later and is engaged with rotation of the sub drum 60. The inner rotor and the outer rotor include a magnet, and when an electric current is applied to the inner and outer winding portions of the drive motor, the inner rotor and the outer rotor rotate due to a magnetic field generated by the flowing current.

The outer shaft 81 penetrates through the tub 40 and connects the inner rotor 73 to the main drum 50. The outer shaft 81 corresponds to a hollow shaft, and the inner shaft 82 is mounted inside the outer shaft 81. The inner shaft 82 penetrates the inside of the outer shaft and connects the outer rotor 72 and the sub-drum 60.

The outer shaft and the inner shaft are rotatable independently of each other with a bearing therebetween. The outer rotor and the inner rotor are also rotatable independently of each other with a stator interposed therebetween. The stator includes separate windings on the outer rotor side and the inner rotor side, and the drive motor can independently drive the outer rotor and the inner rotor. Therefore, since the main drum is driven by the inner rotor and the sub drum is driven by the outer rotor, the main drum and the sub drum can be independently driven by the driving motor.

When the currents of the inner and outer winding portions of the drive motor 70 are respectively controlled, the inner rotor and the outer rotor rotate independently of each other. Accordingly, the main drum 50 and the sub drum 60 can be rotated independently of each other by the single drive motor 70. That is, the driving motor independently drives the main drum and the sub drum. According to the above-described aspect of the present invention, the main drum and the sub drum are independently driven by the driving motor to cause rotation of the laundry by the difference in relative rotation speed between the drums, so that the laundry is rotated inside the drum, .

Embodiments of the present invention will now be described in detail with reference to FIGS. 2 to 4. FIG. According to the present invention, the dual motor shaft system structure of the present invention comprises a hollow outer shaft 81; An inner shaft 82 penetrating the inside of the outer shaft 81; And an outer rotor 72 connected to the inner shaft 82 and rotated outside the stator 71. The outer rotor 72 is connected to the outer shaft 81 and is rotated inside the stator 71 A drive motor (70) including an inner rotor (73); And a spring washer 500 inserted into a connection portion between the outer shaft 81 and the inner rotor 82 to prevent vibration of the outer shaft to prevent noise, do.

2, the inner shaft 82 is inserted into the hollow outer shaft 81 so that the inner shaft 82 can be rotated. The outer shaft 81 is connected to the inner rotor 73 and the inner shaft 82 is connected to the outer rotor 72 to be rotated.

Accordingly, the outer shaft 81 receives the rotational force of the inner rotor 73 and rotates at a high speed. At this time, vibration and noise are generated as the rotational power is transmitted. Therefore, the spring washer 500 is provided between the outer shaft 81 and the inner rotor 73 so as to alleviate vibration in the axial direction.

As shown in FIG. 2, an inner ball bearing 83 is installed between the outer shaft 72 and the inner shaft 73 so that the driving motor independently drives the outer shaft and the inner shaft.

Also, an outer ball bearing 84 is also provided on the outer circumference of the outer shaft 82 to enable rotation of the outer shaft 82 in the shaft structure of the washing machine.

2 and 3, the present invention may further include a detent ring 300 for fixing the spring washer 500 on a connection portion between the outer shaft 81 and the inner rotor 73, The stop ring is formed as a C-ring.

As shown in FIG. 4, the spring washer 500 is formed of an annular concave / convex member having a protrusion 510 and a depression 530 formed therein. Thus, as in the section of FIG. 2, when the outer ring is fitted to the outer periphery of the outer shaft 81 by the unevenness and fixed by the stop ring 300, the outer shaft 81 performs the function of buffering the axial vibration of the outer shaft 81.

Accordingly, the stop ring 300 must restrain the upper surface of the spring washer 500 as shown in FIG. 2 in order to press the spring washer 500 in the axial direction to have an elastic force by the concave and convex portions.

In the present invention, a C-ring, which is the stop ring 300, is inserted into the detent ring groove 81a, including a detent ring groove 81a recessed in the center direction on the outer periphery of the outer shaft 81 Thereby preventing the spring washer 500 from being displaced in the axial direction.

3, the stop ring 300 is formed into a partially cut C-ring because it must be fitted in the stop ring groove 81a formed on the outer periphery of the outer shaft 81. As shown in FIG. The C-ring thus formed is inserted into the detent ring groove 81a on the outer circumference of the outer shaft 81 by opening the incised portion.

According to another embodiment of the present invention shown in FIGS. 2 and 3, an inner bushing 73a is provided between the outer shaft and the inner rotor so that the rotational force of the inner rotor 73 is transmitted to the outer shaft 81 .

An outer bush 72a is also provided in the inner shaft 82 between the outer rotor 72 so that the rotational force of the outer rotor 72 is transmitted to the inner shaft 82. [

The spring washer 500 is installed at a connection portion between the inner bushing 73a and the outer shaft 81 to prevent axial vibration and noise of the outer shaft 81. The outer shaft 81 And a stop ring 300 for fixing the spring washer 500 on the connection portion of the inner bushing 73a.

2 and 3, the spring washer 500 is formed of an annular member that surrounds the outer circumference of the outer shaft 81 on the upper surface of the inner bushing 73a.

Further, a stop ring groove 81a is formed in the outer periphery of the outer shaft 81 so as to be recessed toward the center. The stop ring 500 is formed of a C-ring inserted into the stop ring groove 81a and contacts the upper surface of the spring washer 500. When the spring washer is detached in the axial direction ≪ / RTI >

According to another embodiment of the present invention, a washing machine of the present invention includes: a main body 10 forming an outer appearance; A tub 40 provided inside the main body; A main drum 50 rotatably mounted in the tub; A sub drum (60) mounted inside the main drum to be rotatable relative to the main drum; A hollow outer shaft (81) connected to the main drum; An inner shaft (82) connected to the sub drum inside the outer shaft; And a driving motor 70 including an inner rotor connected to the inner shaft and rotated inside the stator, and a stator 71 connected to the outer shaft, an outer rotor 72 connected to the inner shaft and rotated outside the stator, do.

The washing machine of the present invention includes a spring washer 500 inserted into a connection portion between the outer shaft and the inner rotor and a stop ring 300 for fixing the spring washer to prevent noise from the outer shaft, To prevent unwinding.

In the washing machine of the present invention, an inner bushing 73a is provided between the outer shaft and the inner rotor, and the rotational force of the inner rotor 73 is transmitted to the outer shaft 81.

The spring washer 500 is installed at a connecting portion between the outer shaft 81 and the inner bushing 73a to buffer the axial vibration of the outer shaft 81.

And an inner bearing (83) press-fitted into the inner shaft with the inner shaft.

Since the washing machine according to the present invention employs the shaft structure as described above, the spring washer 500 is formed of the annular concave-convex member having the protrusion 510 and the depression 530 formed therein.

The spring washer 500 is fitted on the outer circumference of the outer shaft 81 and is mounted on the upper surface of the inner bushing by being compressed.

In addition, like the above-described embodiment, the stop ring 300 is formed as a C-ring and is constrained in the axial direction on the outer circumference of the outer shaft 81, Fitted in a detent ring groove (81a) recessed in the center direction from the outer circumferential surface of the spring washer (500), thereby preventing the spring washer (500) from being displaced in the axial direction and imparting axial elasticity to the spring washer.

According to another embodiment of the present invention, the inner shaft 82 includes a serration which is coupled to the outer rotor 72 on the outer periphery of the driving motor-side end, and the outer rotor 72 transmits the rotational force The serration of the inner shaft 82 and the through hole of the outer bushing 72a are formed in an inclined tapered shape so that the serration of the inner shaft 82 and the through bore of the outer bushing 72a are formed in an inclined tapered shape So that the convenience of the coupling and the coupling force can be improved.

2 and 3, a serration is formed at one end of the inner shaft 82 on the drive motor side so that the rotational force of the outer rotor is transmitted to the inner shaft 82. Thus, the serrations of the inner shaft 82 and the inner circumferential surfaces of the inner bushings 72a are engaged with each other in a sawtooth shape to transmit rotational force.

Thus, the serration of the inner shaft 82 is fitted to the inner circumferential surface of the inner bushing 72a, and is formed into a parallel cylindrical shape as shown in FIG. 2 and FIG. However, in this case, the serration of the inner shaft 82 and the inner circumferential surface of the inner bushing 72a may be difficult to be coupled with each other, so that separation may occur, and it may be difficult to completely transmit the rotational force.

Although the serrations of the inner shaft 82 are not shown in the drawing, serrations of the inner shaft 82 are formed so as to be tapered in an inclined manner, and the inner peripheral surface of the inner bush 72a The inner shaft 82 is inserted into the inner bushing 72a so that the inner shaft 82 can be assembled by a greater coupling force so that the strength according to the strong coupling force can be reinforced and the assembling performance can be improved .

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 and will become apparent to those skilled in the art from the following detailed description, The present invention is not limited to the embodiments and the accompanying drawings, and thus the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes, substitutions, and alterations can be made hereto without departing from the spirit of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are also included in the scope of the present invention.

10: main body (cabinet) 20: inlet
30: Control panel 40:
50: main drum 60: sub drum
70: drive motor 71:
72: outer rotor 72a: outer bushing
73: Inner rotor 73a: Inner bushing
81: outer shaft 81a: stop ring groove
82: Inner shaft 83: Inner ball bearing
84: Outer ball bearing 91: Main drum spider
95: Sub drum spider 300: C-ring
500: spring washer 510: protrusion
530: depression

Claims (17)

Hollow outer shaft;
An inner shaft penetrating the inside of the outer shaft; And
A stator, an outer rotor connected to the inner shaft and rotated on the outer side of the stator, and an inner rotor connected to the outer shaft and rotated inside the stator; And
And a spring washer inserted into a connection portion between the outer shaft and the inner rotor to prevent vibration by buffering the vibration of the outer shaft,
Further comprising a stop ring formed of a C-ring and fixing the spring washer on a connecting portion of the outer shaft and the inner rotor,
Wherein a detent ring groove recessed in the center direction is formed on the outer periphery of the outer shaft and the detent ring is inserted into the detent ring groove to prevent the spring washer from being detached in the axial direction. . delete delete delete The method according to claim 1,
Wherein an inner bushing is provided between the outer shaft and the inner rotor so that the rotational force of the inner rotor is transmitted to the outer shaft. 6. The method of claim 5,
The spring washer
In order to prevent axial vibration and noise of the outer shaft,
Wherein the inner shaft is installed at a connection portion between the inner bushing and the outer shaft.
delete delete The method according to claim 1,
The spring washer
And a protruding portion and a depressed portion are formed on an inner peripheral surface of the drum-type washing machine.
The method according to claim 1,
Wherein an inner ball bearing is provided between the outer shaft and the inner shaft so that the driving motor independently drives the outer shaft and the inner shaft. The method according to claim 1,
Wherein the inner shaft includes a serration coupled with an outer rotor on an outer periphery of an end portion of the driving motor,
Wherein the outer rotor includes an outer bushing having a through hole formed therein for engaging the serration with the serration at an inner circumferential surface thereof for transmitting rotational force,
Wherein the serration of the inner shaft and the through hole of the outer bushing are formed in an inclined tapered shape to improve the convenience of coupling and the coupling force.
A body forming an outer appearance;
A tub disposed inside the main body;
A main drum rotatably mounted in the tub;
A sub drum mounted inside the main drum to be rotatable relative to the main drum;
A hollow outer shaft connected to the main drum;
An inner shaft connected to the sub drum inside the outer shaft;
A stator, an outer rotor connected to the inner shaft and rotated on the outer side of the stator, and an inner rotor connected to the outer shaft and rotated inside the stator; And
A spring washer inserted into a connection portion between the outer shaft and the inner rotor, and a stop ring for fixing the spring washer, thereby preventing noise of the outer shaft,
A stop ring recessed in the center direction is formed on the outer circumferential surface of the outer shaft,
The stop ring is formed of a C-ring and is fixed in the axial direction by being fitted in the stop ring groove so as to be confined axially in the outer periphery of the outer shaft, thereby preventing the spring washer from being displaced in the axial direction And at the same time, gives an axial elasticity of the spring washer. 13. The method of claim 12,
An inner bushing is provided between the outer shaft and the inner rotor so that the rotational force of the inner rotor is transmitted to the outer shaft,
Wherein the spring washer is installed at a connection portion between the outer shaft and the inner bushing to buffer the axial vibration of the outer shaft.
14. The method of claim 13,
And an inner bearing which is press-fitted into the inner shaft with the inner shaft in the outer shaft.
15. The method of claim 14,
The spring washer
Wherein the outer drum is an annular concave / convex member having protrusions and depressions, and is fitted to the outer circumference of the outer shaft, and is press-fitted on the upper surface of the inner bush.
delete delete

Images