Washing machine to produce three-dimensional motion

Patent metadata

Field	Value
Publication number	US-9290881-B2
Application number	US-201213659117-A
Country	US
Kind code	B2
Filing date	Oct 24, 2012
Priority date	Oct 20, 2011
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A washing machine includes a main body defining an outer appearance, a tub disposed within the main body, a main drum rotatably mounted in the tub, and a sub drum mounted in the main drum to be relatively rotatable with respect to the main drum. The washing machine includes an outer shaft for rotating the main drum, an inner shaft for rotating the sub drum, being disposed inside the outer shaft, and a driving motor having a stator, an outer rotor connected to the inner shaft and rotatable outside the stator, and an inner rotor connected to the outer shaft and rotatable inside the stator. The washing machine also includes a spring washer inserted into a connection part of the outer shaft and the inner rotor that attenuates vibrations of the outer shaft to prevent noise and to prevent separation of the outer shaft due to the vibrations.

First claim

What is claimed is:

1. A washing machine comprising:
a main body defining an outer appearance;
a tub disposed within the main body;
a main drum rotatably mounted in the tub;
a sub drum mounted in the main drum to be relatively rotatable with respect to the main drum;
an outer shaft for rotating the main drum;
an inner shaft for rotating the sub drum, being disposed inside the outer shaft;
a driving motor including:
a stator that includes outer teeth, inner teeth, a yoke, and a housing coupling opening,
an outer rotor connected to the inner shaft and rotatable outside the stator, and
an inner rotor connected to the outer shaft and rotatable inside the stator; and

a motor assembly structure of a bearing housing including a housing main body, a bearing shaft hole, and a stator coupling opening, wherein the stator coupling opening includes a fitting protrusion and the housing coupling opening includes a fitting recess, such that the fitting protrusion is inserted into the fitting recess, thereby enhancing an assembly characteristic between the bearing housing and the stator.

2. The washing machine of claim 1 , wherein the stator coupling opening and the housing coupling opening are provided with coupling openings communicated with each other when the bearing housing and the stator are assembled to each other, and in a state that the fitting protrusion has been insertion-fixed to the fitting recess, the bearing housing and the stator are assembled to each other by screws through the coupling openings.

3. The washing machine of claim 1 , wherein the stator comprises a plurality of spacers protruding from the yoke so that the stator is coupled to the bearing housing with a gap therebetween.

4. The washing machine of claim 1 , wherein the housing main body includes a protruding portion at a position corresponding to a winding portion of the inner teeth, and a concaved portion at a position corresponding to a slot between the inner teeth.

5. The washing machine of claim 4 , wherein the concaved portion is formed as a space to convect heat generated from the winding portion of the inner teeth, and protruding portion of the housing main body is formed as a conducting portion to conduct heat generated from the winding portion of the inner teeth to the outside.

6. The washing machine of claim 4 , wherein the protruding portion of the bearing housing is spaced from a coil wound on the winding portion of the inner teeth by a predetermined insulating distance.

7. The washing machine of claim 1 , further comprising a structure of a current connector and a hall sensor for a dual motor that includes the stator having the inner teeth and the outer teeth, wherein the current connector applies power to an outer winding portion of the outer teeth and an inner winding portion of the inner teeth in an integrated manner, and the hall sensor applies power to an outer hall sensor and an inner hall sensor in an integrated manner.

8. A washing machine comprising:
a main body defining an outer appearance;
a tub disposed within the main body;
a main drum rotatably mounted in the tub;
a sub drum mounted in the main drum to be relatively rotatable with respect to the main drum;
an outer shaft for rotating the main drum;
an inner shaft for rotating the sub drum, being disposed inside the outer shaft;
a driving motor having a stator, an outer rotor connected to the inner shaft and rotatable outside the stator, and an inner rotor connected to the outer shaft and rotatable inside the stator; and
a spring washer inserted into a connection part of the outer shaft and the inner rotor that attenuates vibrations of the outer shaft to prevent noise and to prevent separation of the outer shaft due to the vibrations.

9. The machine of claim 8 , further comprising a stopping ring provided at a connection part of the outer shaft and the inner rotor to secure the spring washer so as to prevent separation of the spring washer in an axial direction, wherein the stopping ring includes a C-ring.

10. The machine of claim 8 , further comprising a stopping ring recess concaved from an outer circumference of the outer shaft toward the center, wherein the C-ring is inserted into the stopping ring recess to prevent separation of the spring washer in the axial direction.

11. The machine of claim 8 , wherein the spring washer is an annular concave-convex member including a protruding portion and a concaved portion.

12. A washing machine comprising:
a main body defining an outer appearance;
a tub disposed within the main body;
a main drum rotatably mounted in the tub;
a sub drum mounted in the main drum to be relatively rotatable with respect to the main drum;
an outer shaft for rotating the main drum;
an inner shaft for rotating the sub drum, being disposed inside the outer shaft;
a driving motor having a stator, an outer rotor connected to the inner shaft and rotatable outside the stator, and an inner rotor connected to the outer shaft and rotatable inside the stator;
a spring washer inserted into the outer shaft at a connection part of the outer shaft and the inner rotor; and
an inner rotor nut configured to forcibly fix the inner rotor after the spring washer has been insertion-coupled to the outer shaft, wherein the inner rotor nut attenuates the vibrations of the outer shaft in an axial direction and prevents release due to an entangled state.

13. The machine of claim 12 , further comprising a plain washer insertion-coupled to part between the inner rotor and the spring washer on the outer circumference of the outer shaft.

14. The machine of claim 12 , further comprising an inner bushing installed between the outer shaft and the inner rotor that transfers a rotation force of the inner rotor to the outer shaft.

15. The machine of claim 14 , wherein the spring washer is an annular concave-convex member formed on an upper surface of the inner bushing, that covers the outer circumference of the outer shaft, and that prevents vibrations of the outer shaft in an axial direction and noise.

Assignees

• Lg Electronics Inc

Inventors

• Jun Chaseung
• Choi Byungkeol
• Kim Youngmin
• Kim Dongwon
• Kim Hyundong
• Jung Hwanjin
• Min Byungwook
• Kim Kyeonghwan
• Kim Jinwoong
• Son Changwoo
• Seo Hyunseok

Classifications

• H02K16/02

  Machines with one stator and two {or more} rotors · CPC title

• H02K16/00

  Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} · CPC title

• H02K15/022

  with salient poles · CPC title

• H02K21/22

  with magnets rotating around the armatures, e.g. flywheel magnetos · CPC title

• D06F23/02

  and rotating or oscillating about a horizontal axis · CPC title