JP2002153694A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of guaranteeing the formation of a predetermined gap between the outermost peripheral face of the core of a stator and the permanent magnet of the rotor facing it even when the rotor rotates. SOLUTION: A main shaft 7 having a large diameter is attached to an end face on a rear surface side of a drum 6 so as to rotate integrally. A bearing 8 whose center is formed into a substantially cylindrical shape and which is provided with a plurality of arms extending radially toward an outer peripheral side from a cylindrical part is fixed to an end face on a rear surface side of an outer tank 2 to support the main shaft 7 through a bearing 9 provided in the cylindrical part so as to rotate freely. The rotor 11 of a motor 10 is fixed to a tip part of the main shaft 7, and the stator 21 of the motor 10 is fixed to the bearing 8. The motor 10 is a DC brushless motor having an outer rotor shape having a flat shape in the direction of depth of the washing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine in which laundry is stored in a drum for washing or washing and drying (herein, a washing machine having both drying functions is also called a "washing machine"). To).

[0002]

2. Description of the Related Art In a drum type washing machine, laundry is accommodated in a drum which is rotated about a horizontal axis so that washing to drying can be performed consistently. As a method of rotating and driving the main shaft of the drum, a so-called belt drive in which a motor is attached to the lower side of the outer tank and a pulley fixed to the motor shaft and a pulley attached to the main shaft of the drum are connected using a V-belt or the like. Generally,

On the other hand, the applicant of the present application has filed Japanese Patent Application No.
No. 270 proposes a so-called direct drive type drum type washing machine in which a motor shaft of a motor mounted on the back of an outer tub is directly connected to a main shaft of a drum. In this washing machine, since the outer tub has a substantially uniform weight distribution around the rotation axis, the center of gravity of the outer tub can be brought closer to the rotation center of the drum without using a weight for balance. As a result, there is an advantage that vibration of the outer tank during rotation of the drum can be suppressed and the weight can be reduced.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a drum type washing machine using an outer rotor type motor as a drive source for directly driving a drum. It is an object of the present invention to provide a drum type washing machine in which a predetermined gap is ensured between a permanent magnet of a rotor and a permanent magnet. further,
An object of the present invention is to provide a drum type washing machine capable of effectively cooling a winding of a motor.

[0005]

A first drum type washing machine according to the present invention comprises an outer tub having an open front surface, a drum disposed in the outer tub and having an open front surface, and a back surface of the drum. The main shaft fixed to the, and fixed to the back of the outer tub,
A cylindrical portion having a substantially cylindrical shape is formed at a central portion, the bearing includes a bearing rotatably supporting the main shaft via a bearing provided in the cylindrical portion, a rotor and a stator, and the rotor is fixed to the main shaft, An outer rotor type motor in which the stator is fixed to the bearing.

A second drum type washing machine according to the present invention comprises a drum rotated about a horizontal axis, an outer tub containing the drum, a main shaft fixed to the drum, and the outer tub. And a cylindrical portion having a substantially cylindrical shape is formed in the center portion, and a bearing for rotatably supporting the main shaft via a bearing provided in the cylindrical portion, a rotor and a stator, wherein the rotor is An outer rotor type motor fixed to the main shaft and the stator fixed to the bearing.

In a third drum type washing machine according to the present invention, in the first or second drum type washing machine, the rotor may be provided with a wing body which rotates integrally with the rotor and an air vent. And an air flow generated when the rotor rotates is brought into contact with the coils of the stator and the bearings.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION AND THE EFFECT OF THE INVENTION
And in the second drum type washing machine, the stator is fixed to the bearing, and even when the rotor rotates, a predetermined gap can be formed between the outermost peripheral surface of the stator core and the permanent magnet of the rotor facing the core. Guaranteed.

Further, in the third drum type washing machine according to the present invention, even when the rotor rotates at a relatively low rotation speed, it is possible to prevent the temperature of the coil and the bearing of the stator from becoming abnormally high.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drum type washing machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side sectional view showing an entire configuration of a drum type washing machine according to the present embodiment. FIG. 2 is a side sectional view showing a detailed structure of a motor (A portion in FIG. 1) of the drum type washing machine. FIG. 3 is a sectional view taken along the line BB ′ in FIG. 2 showing a structure of a rotor of the motor.

As shown in FIG. 1, in this drum type washing machine, a substantially cylindrical outer tub 2 having an open front surface is suspended and supported by a vibration-proof spring 3 and a damper 4 inside an outer box 1. A door 5 for opening and closing the front opening of the outer tub 2 is provided on the front surface. Similarly, a drum 6 having a front opening is disposed in the outer tub 2.
Are mounted so as to rotate together. On the other hand, a bearing 8 having a substantially cylindrical shape at the center and a plurality of arms extending radially from the cylindrical portion toward the outer peripheral side is fixed to the rear end surface of the outer tub 2. The main shaft 7 is rotatably supported via a bearing 9 provided on the main shaft 7. The rotor 11 of the motor 10 is provided at the tip of the spindle 7.
The stator 21 of the motor 10 is fixed to the bearing 8. The motor 10 is an outer rotor type DC brushless motor having a flat shape in the depth direction of the washing machine, and details of its structure are as follows.

As shown in FIG. 2, the rotor 11 includes a rotor housing 12 made of a resin material or a metal material having a magnet attachment portion 13 formed on the outer peripheral concentric circle, and a plurality of rotor housings attached to the magnet attachment portion 13. And the permanent magnet 19. The magnet mounting portion 13 is configured to divide the entire circumference into a predetermined number by ribs projecting inward at predetermined angles in the circumferential direction of the rotor housing 12.
9 are alternately arranged. The permanent magnet 19
Can be fixed to the rotor housing 12 by insert molding or other various methods.

As shown in detail in FIG. 3, a plurality of wings 14 are formed in the rotor housing 12 at a predetermined angle (30 degrees in FIG. 3) at a predetermined angle (30 degrees in FIG. 3). ing. Further, a front wall portion 15 for closing the front of the adjacent wing body 14 and a rear wall portion 16 for closing the rear side are formed continuously with the wing body 14. Therefore, the wing 14, the front wall 15, the rear wall 16, and the magnet mounting portion 13 form a space that is open only on the outer peripheral side. Further, a ventilation hole 17 that communicates between the inner peripheral side and the outer peripheral side of the rotor housing 12 penetrates behind the magnet attachment portion 13. Further, on the inner periphery of the rotor housing 12, a rib-shaped auxiliary wing body 18 is formed in the same plane as the wing body. The rotor housing 12 having such a structure is screwed to a tip end surface of the main shaft 7 with a screw 20, and both are rotated integrally.

On the other hand, the stator 21 is an annular member made of a resin material or the like, and has a stator housing 22 having a plurality of hollow coil supporting portions formed radially projecting outward on the outer peripheral side.
And a core (iron core) 23 inserted into the coil supporting portion.
And a coil 24 wound around the outside of the coil supporting portion. The stator housing 22 is fixed to the arm of the bearing 8 by a screw 25, and a predetermined gap is formed between the outermost peripheral surface of the core 23 and the permanent magnet 19 facing the same even when the rotor 11 rotates as described later. Is guaranteed.

In the above configuration, when a drive current is supplied from a control circuit (not shown) to the coil 24 of the stator 21, a magnetic path is formed in the permanent magnet 19 facing the coil 24 with a gap therebetween. As a result, the rotor 11 rotates, and the drum 6 is rotationally driven via the main shaft 7 at the same rotational speed as the rotor 11.

The wing body 14 rotates integrally with the rotor housing 12, and as described above, the air existing in the space substantially defined by the adjacent wing body 14 is strongly pushed in the outer peripheral direction. As a result, the air pressure in the space drops instantaneously, so that air flows out from the inner peripheral side of the rotor housing 12 through the ventilation holes 17. Further, the air pressure in the space surrounded by the rotor housing 12 and the stator 21 is thereby temporarily reduced, and air flows in from the outside through the gap between the arms adjacent to the bearing 8 in front of the stator 21. In this way,
An airflow as shown by the arrow in FIG. 2 is generated. Further, the auxiliary wing body 18 mainly has a function of a current plate, and makes the flow of air from the inner peripheral side to the outer peripheral side of the rotor housing 12 through the ventilation hole 17 more smooth.

The air flow passes near the coil 24 of the stator 21. Although the coil 24 generates heat due to the heat loss of the driving current, the heat is carried away by such an air flow, so that it is possible to prevent the temperature of the coil 24 and its surroundings from becoming abnormally high. Further, a part of the air flow comes into contact with the cylindrical portion of the bearing 8 surrounding the bearing 9. When the main shaft 7 rotates, the bearing 9 generates heat due to friction. In particular, when the amount of load (the amount of laundry) on the drum 6 is large, that is, when the imbalance of the weight around the rotation axis of the drum 6 is large, the friction increases and the heat generation increases. Since the heat generated by such friction is taken away by the airflow in contact with the cylindrical portion of the bearing 8, it is possible to prevent the temperature of the bearing 9 and its surroundings from becoming abnormally high.

The cooling effect of the stator 21 increases as the size of the wing 14 increases.
As a result, the wind noise generated by the motor 10 increases, and the load on the motor 10 increases due to an increase in air resistance. Therefore, it is desirable to appropriately determine the size of the wing body 14 within an acceptable range.

Usually, in this type of washing machine, the outer tub 2
Since sufficient performance can be obtained with the motor 10 having an outer diameter considerably smaller than the outer diameter of the outer tub 2, the periphery of the motor 10 on the back side of the outer tub 2 is an unused space (so-called dead space). Therefore, as in the above embodiment, the wings 14 protrude outside the rotor housing 12.
Is provided, the maximum outer diameter of the motor 10 can be made smaller than the outer diameter of the outer tub 2. In other words, according to the configuration of the motor described above, the dead space can be effectively used.

By the way, in the configuration of the above embodiment, the spindle 7
The drum 6 and the rotor 11 are respectively attached to both ends of the main shaft 7 with two bearings 9 supporting the same. With such a structure, it is difficult to widen the interval between the two bearings 9 that contact the main shaft 7. If the distance between the two bearings 9 can be increased, the main shaft 7 is more stably held, so that the vibration of the drum 6 and the outer tub 2 can be suppressed.

Therefore, the structure can be modified as shown in FIG. In this example, the bearing is divided into a front bearing 81 that is directly attached to the rear end face of the outer tub 2 and a rear bearing 82 that is attached to the front bearing 81 and supports the main shaft 7 on the rear side of the motor 10. I have. The main shaft 7 includes a front bearing 81
And a bearing 9 provided in the cylindrical portion inside the rear bearing 82, and the rotor housing 12 of the rotor 11 is fixed to the main shaft 7 therebetween. I have. As a result, the distance between the bearings 9 can be increased, and since the main shaft 7 is supported before and after the rotor 11 which is a rotary drive source, the load applied to the bearing 9 itself is reduced, and the bearing 9 is damaged. Failures and the like can be reduced.

The above embodiment is merely an example, and it is apparent that changes and modifications can be made as appropriate within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing the entire configuration of a drum type washing machine according to one embodiment of the present invention.

FIG. 2 shows a motor (A in FIG. 1) of the drum type washing machine.
FIG. 2 is a side cross-sectional view showing a detailed structure of a part).

FIG. 3 is a sectional view taken along line BB ′ in FIG. 2;

FIG. 4 is a schematic side sectional view of a drum type washing machine according to another embodiment of the present invention.

[Explanation of symbols]

2 ... Outer tank 6 ... Drum 7 ... Main shaft 8 ... Bearing 9 ... Bearing 10 ... Motor 11 ... Rotor 12 ... Rotor housing 14 ... Wing body 15 ... Front wall part 16 ... Rear wall part 17 ... Vent hole 18 ... Auxiliary wing body 19 ... permanent magnet 21 ... stator 22 ... stator housing 23 ... core 24 ... coil

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kawamura Kaname ▲ Kura ▼ Sanyo Electric Co., Ltd. 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka (72) Inventor Tomoya Kawaguchi Keihanhondori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Seoh Sugo 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3B155 AA10 AA16 BA04 BA12 BA02 CA02 CB07 CB49 HB10 HB11 HB15 HB17 MA01 MA02 MA08 5H607 AA12 BB01 BB07 BB09 BB14 BB17 BB25 CC05 DD14 DD16 FF04 FF12

Claims (3)

[Claims] 1. An outer tub having an open front surface, a drum disposed in the outer tub and having an open front surface, a main shaft fixed to the back surface of the drum, and fixed to the back surface of the outer tub. A cylindrical portion having a substantially cylindrical shape is formed at a central portion, the bearing includes a bearing rotatably supporting the main shaft via a bearing provided in the cylindrical portion, and a rotor and a stator, wherein the rotor is fixed to the main shaft. And an outer rotor type motor in which the stator is fixed to the bearing. 2. A drum which is rotated about a horizontal axis, an outer tank which houses the drum, a main shaft fixed to the drum, and which is fixed to the outer tank and has a substantially cylindrical shape in the center. A cylindrical portion is formed, the bearing comprises a bearing rotatably supporting the main shaft via a bearing provided in the cylindrical portion, a rotor and a stator, wherein the rotor is fixed to the main shaft, and the stator is fixed to the bearing. A drum-type washing machine, comprising: 3. The air conditioner according to claim 1, wherein the rotor is provided with a blade body and an air vent that rotate integrally with the rotor, and an air flow generated when the rotor rotates contacts the coils of the stator and the bearing. 3. The drum type washing machine according to 1 or 2.