WO2018038009A1

WO2018038009A1 - Washing machine

Info

Publication number: WO2018038009A1
Application number: PCT/JP2017/029601
Authority: WO
Inventors: 功治岩▲崎▼
Original assignee: 日本電産テクノモータ株式会社
Priority date: 2016-08-26
Filing date: 2017-08-18
Publication date: 2018-03-01
Also published as: JP2019187455A

Abstract

A washing machine (1) having a washing drum (13) is provided with a first pulley (22) which rotates about the central axis (CA) of the washing drum (13), a plurality of second pulleys (23) coupled to the first pulley (22) via a belt (25), and a plurality of motors (24) for rotating the plurality of second pulleys (23) in the same direction and at the same rotating speed. The pulley ratios between the first pulley (22) and each of the plurality of second pulleys (23) are all the same. The plurality of motors (24) include at least a first motor (24a) and a second motor (24b). The axis of rotation (AR1) of the first motor (24a) is positioned in a region on the opposite side to the axis of rotation (AR2) of the second motor (24b) with a plane comprising the central axis (CA) as the boundary plane therebetween and perpendicularly intersects a plane perpendicularly intersecting the central axis (CA) and the axis of rotation (AR2) of the second motor (24b), or is positioned upon the aforementioned boundary plane.

Description

Washing machine

The present invention relates to a washing machine.

Japanese Unexamined Patent Application Publication No. 2007-236641 discloses a vertical fully automatic washing machine. A water tank and a washing tub disposed concentrically with the water tank inside the water tank are arranged inside the outer box of the vertical fully automatic washing machine. A drive unit is mounted on the lower surface of the water tank. The drive unit includes a motor, a belt transmission mechanism that transmits output rotation of the motor, and a clutch / brake mechanism.

JP 2007-236641 A

In the conventional vertical washing machine, the washing machine is driven by one motor. The motor is disposed at a position shifted from the central axis of the rotating washing tub. In a conventional vertical washing machine, there is a possibility that the center of gravity is biased toward the side where the motor is provided, resulting in an unbalance. If the center of gravity is biased and unbalanced, vibration may occur when the washing machine is driven. *

In view of the above points, an object of the present invention is to provide a washing machine that is unlikely to cause an imbalance in weight with respect to the central axis of the washing tub and can suppress the occurrence of vibration.

An exemplary washing machine of the present invention is a washing machine having a washing tub, and includes a first pulley that rotates about a central axis of the washing tub, and a plurality of pulleys coupled to the first pulley via a belt. A second pulley, and a plurality of motors for rotating the plurality of second pulleys at the same rotational speed in the same direction. The pulley ratio between the first pulley and each of the plurality of second pulleys is the same. The plurality of motors include at least a first motor and a second motor. The rotation axis of the first motor is orthogonal to the plane including the central axis and the rotation axis of the second motor, and is a region opposite to the rotation axis of the second motor with the plane including the central axis as a boundary surface. Alternatively, it is located on the boundary surface.

According to the exemplary present invention, it is possible to provide a washing machine that is unlikely to cause an imbalance in weight with respect to the central axis of the washing tub and can suppress the occurrence of vibration.

FIG. 1 is a schematic cross-sectional view of a washing machine according to an embodiment of the present invention. FIG. 2 is a schematic plan view for explaining the configuration of the drive mechanism of the washing machine according to the embodiment of the present invention. FIG. 3 is a schematic plan view showing a configuration of a motor included in the washing machine according to the embodiment of the present invention. FIG. 4 is a schematic plan view showing the relationship between the upper first pulley and the upper second pulley of the washing machine according to the embodiment of the present invention. FIG. 5 is a schematic plan view showing the relationship between the lower first pulley and the lower second pulley of the washing machine according to the embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing the relationship between the first and second pulleys and the belt of the washing machine according to the embodiment of the present invention. FIG. 7 is a schematic plan view showing a positional relationship among a plurality of motors included in the washing machine according to the embodiment of the present invention. FIG. 8 is a schematic plan view showing a positional relationship among a plurality of motors included in the washing machine according to the first modification. FIG. 9 is a schematic plan view showing the relationship between the first pulley and the second pulley of the washing machine according to the second modification.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the direction in which the central axis CA of the washing tub 13 shown in FIG. 1 extends is simply referred to as “axial direction”, and the radial direction and the circumferential direction around the central axis CA are simply “radial direction” and “circumferential direction”. I will call it. Further, the vertical direction is defined with reference to the arrangement of the washing machine 1 shown in FIG. Moreover, the front-back direction is defined with the left side of the washing machine 1 shown in FIG. Further, the horizontal direction is defined with a plane perpendicular to the vertical direction as a horizontal plane. However, from the definition of this direction, there is no intention to limit the direction of the washing machine according to the present invention. In the present application, the diameter of the pulley refers to a diameter (pitch circle diameter) in the pitch circle of the pulley. *

<1. Configuration of Washing Machine> FIG. 1 is a schematic cross-sectional view of a washing machine 1 according to an embodiment of the present invention. The washing machine 1 is a vertical electric washing machine. As shown in FIG. 1, the washing machine 1 has a housing 10. The washing machine 1 has a control circuit (not shown) including a microcomputer at an appropriate position in the housing 10. An opening 10 a is formed on the upper surface of the housing 10. The laundry such as clothes is taken in and out through the opening 10a. The washing machine 1 has a lid 11 that opens and closes the opening 10a. *

The washing machine 1 has a water tank 12 that houses a washing tank 13. Details of the washing tub 13 will be described later. The water tank 12 has a bottomed box shape having an opening on the upper surface. Specifically, the water tank 12 is elastically supported by a plurality of suspension bars 14 and suspension mechanisms 15 provided in the housing 10. The water tank 12 stores water supplied from a water supply port 16 provided at the upper rear of the housing 10. A drain port (not shown) is provided at the bottom 12 a of the water tank 12. A drainage hose 17 having an on-off valve 17a is connected to the drainage port. By opening the on-off valve 17 a, the water stored in the water tank 12 is drained to the outside through the drain hose 17. *

The washing machine 1 has a washing tub 13. In the present embodiment, the central axis CA of the washing tub 13 extends in the vertical direction. The washing tub 13 has a cylindrical shape having a bottom portion 13a on one side in the axial direction. Specifically, the washing tub 13 has a bottomed cylindrical shape having a bottom portion 13a on the lower side. The washing tub 13 is rotatable about the central axis CA. The central axis CA passes through the central portion of the water tank 10. The washing tub 13 is a tub for storing laundry such as clothes, and also serves as a dehydration tub. A plurality of through holes 13b are formed in the side wall of the washing tub 13 as shown in FIG. Water stored in the water tub 12 enters the washing tub 13 through the plurality of through holes 13b. Further, at the time of dehydration, water is discharged from the washing tub 13 to the water tub 12 through the plurality of through holes 13b. The water discharged to the water tank 12 is discharged to the outside through the drain hose 17. *

The washing machine 1 has an agitation blade 18 disposed coaxially with the washing tub 13 at the inner bottom of the washing tub 13. The stirring blade 18 generates a water flow in the washing tub 13 during washing and rinsing. In addition, the washing machine 1 includes a drive mechanism 19 that is provided outside the bottom 12 a of the water tub 12 and drives the washing tub 13 and the stirring blade 18. The drive mechanism 19 is disposed below the water tank 12. *

FIG. 2 is a schematic plan view for explaining the configuration of the drive mechanism 19 included in the washing machine 1 according to the embodiment of the present invention. In FIG. 2, the washing tub 13 connected to the drive mechanism 19 is also shown for easy understanding. As shown in FIG. 2, the washing machine 1 has an attachment member 20. The attachment member 20 is made of, for example, metal. The attachment member 20 is fixed to the outer surface side of the bottom 12 a (see FIG. 1) of the water tub 12 that houses the washing tub 13. For example, screws or the like are used to fix the mounting member 20 to the water tank 12. The drive mechanism 19 is supported by the attachment member 20. *

As shown in FIG. 2, the drive mechanism 19 includes a clutch unit 21, a first pulley 22, a plurality of second pulleys 23, and a plurality of motors 24. That is, the washing machine 1 includes a clutch unit 21, a first pulley 22, a plurality of second pulleys 23, and a plurality of motors 24. The first pulley 22, the plurality of second pulleys 23, and the plurality of motors 24 are disposed below the water tank 12. In the washing machine 1, the motor 24 having a large weight among the components constituting the washing machine 1 is disposed in the lower portion of the washing machine 1. For this reason, the washing machine 1 can improve a sense of stability compared with the washing machine in which the motor is disposed in the upper portion. *

As shown in FIG. 2, the clutch unit 21 is disposed between the washing tub 13 and the first pulley 22 in the axial direction and is provided around the central axis CA. In the present embodiment, the clutch unit 21 is indirectly attached to the lower surface of the water tank 12 via the attachment member 20. However, this is only an example, and the clutch unit 21 may be directly attached to the lower surface of the water tank 12. *

The clutch unit 21 switches between the integral rotation of the washing tub 13 and the stirring blade 18 and the rotation of only the stirring blade 18. Specifically, the clutch unit 21 to which the driving forces of the plurality of motors 24 are transmitted rotates only the stirring blade 18 and does not rotate the washing tub 13 in the washing process. The clutch unit 21 preferably has a brake mechanism that suppresses the rotation of the washing tub 13. The washing process includes washing and rinsing. Further, the clutch unit 21 to which the driving force of the plurality of motors 24 is transmitted rotates the washing tub 13 and the stirring blade 18 integrally in the dehydration process. Since the clutch unit 21 is provided, the rotation of the washing tub 13 and the stirring blade 18 can be appropriately switched according to each process. *

The first pulley 22 rotates about the central axis CA of the washing tub 13. In the present embodiment, the number of the first pulleys 22 is the same as the number of the plurality of motors 24. The first pulley 22 has an upper first pulley 22a and a lower first pulley 22b. The plurality of

first pulleys

22a and 22b are arranged in the axial direction. In the present embodiment, the upper first pulley 22a and the lower first pulley 22b are attached to a shaft 21a that extends in the axial direction of the clutch unit 21. The shaft 21a rotates about the central axis CA. The upper first pulley 22a and the lower first pulley 22b have a through hole in the center. The shaft 21a is inserted into the through hole. *

The plurality of motors 24 rotate the plurality of second pulleys 23 in the same direction at the same rotation speed. The plurality of motors 24 include at least a first motor 24a and a second motor 24b. The number of the plurality of motors 24 is the same as the number of the plurality of second pulleys 23. In the present embodiment, there are two motors 24. That is, in the present embodiment, the washing machine 1 includes only the first motor 24a and the second motor 24b. The first motor 24a and the second motor 24b have the same output and rotate in the same direction. The control unit of the washing machine 1 drives the first motor 24a and the second motor 24b in synchronization. *

The motor 24 is a brushless DC motor. In the present embodiment, both the first motor 24a and the second motor 24b are brushless DC motors. The washing machine 1 has an inverter circuit (not shown) that performs drive control of the brushless DC motor. The brushless DC motor is smaller and lighter, for example, uses less windings and stator cores than an induction motor. For this reason, it can suppress that the weight of the washing machine 1 which has the some motor 24 becomes heavy. *

The first motor 24a and the second motor 24b are respectively disposed at positions away from the clutch unit 21 in the radial direction. The first motor 24 a and the second motor 24 b are indirectly attached to the lower surface of the water tank 12 via the attachment member 20. However, this is merely an example, and the

motors

24 a and 24 b may be directly attached to the lower surface of the water tank 12. *

FIG. 3 is a schematic plan view showing the configuration of the motor 24 included in the washing machine 1 according to the embodiment of the present invention. In the present embodiment, the motor 24 includes a first motor 24a and a second motor 24b, which have the same structure. The motor 24 has an output shaft 241 that rotates about a rotation axis AR that extends in a direction parallel to the central axis CA. The output shaft 241 is a part of a rotor (not shown). The motor 24 has a resin casing 242. The casing 242 is integrated with a stator (not shown) of the motor 24 by insert molding. By making the casing 242 made of resin, corrosion of the motor 24 due to water can be suppressed as compared with the case where the casing is made of metal. Moreover, since the motor 24 in which the casing 242 is made of resin can be configured to have excellent heat dissipation, the installation of a fan for cooling the motor 24 can be omitted. *

The casing 242 has a pair of mounting legs 243 at positions facing each other across the output shaft 241. The mounting leg 243 is the same member as the casing 242, and the casing 24
2 protrudes from the outer surface. The motor 24 is fixed to the mounting member 20 in a state where a part thereof is placed in a recess (not shown) provided in the mounting member 20. For this purpose, the mounting leg 243 is provided in the vicinity of the intermediate position in the vertical direction of the casing 242. Each mounting leg 243 is formed with a long hole 244 that engages with a fastener 26 (see FIG. 2) such as a screw. The holes provided in the mounting legs 243 may be round holes or the like instead of long holes. By providing the elongated hole 244 in the mounting leg 243, the position of the motor 24 can be easily adjusted. Note that the number, shape, and installation position of the mounting legs 243 may be appropriately changed from the configuration of the present embodiment. Further, the mounting leg 243 may be configured as a member different from the casing 242.

An upper second pulley 23a is attached to the tip of the output shaft 241 of the first motor 24a. A lower second pulley 23b is attached to the tip of the output shaft 241 of the second motor 24b. The upper second pulley 23a and the lower second pulley 23b have a through hole at the center. The output shaft 241 of each

motor

24a, 24b is inserted into a through hole provided in each

second pulley

23a, 23b. *

The plurality of

second pulleys

23 a and 23 b are connected to the first pulley 22 via a belt 25. In the present embodiment, as described above, the first pulley 22 includes the upper first pulley 22a and the lower first pulley 25b arranged in the axial direction. The upper second pulley 23a is connected to the upper first pulley 22a via the upper belt 25a. The lower second pulley 23b is connected to the lower first pulley 22b via a lower belt 25b. Since the upper belt 25a and the lower belt 25b connect mutually different pulleys, the possibility of contact can be reduced. For this reason, in this configuration, the wear of the belt can be reduced. *

FIG. 4 is a schematic plan view showing the relationship between the upper first pulley 22a and the upper second pulley 23a of the washing machine 1 according to the embodiment of the present invention. As shown in FIG. 4, the upper first pulley 22a has a diameter R1, and the upper second pulley 23a has a diameter R3. FIG. 5 is a schematic plan view showing the relationship between the lower first pulley 22b and the lower second pulley 23b of the washing machine 1 according to the embodiment of the present invention. As shown in FIG. 5, the diameter of the lower first pulley 22a is R2, and the diameter of the lower second pulley 23b is R4. *

In the washing machine 1, the pulley ratio between the first pulley 22 and each of the plurality of second pulleys 23 is the same. In the present embodiment, the number of the first pulleys 22 is plural, and the pulley ratios of the first pulley 22 and the second pulley 23 that are connected to each other by the belt 25 are the same. Specifically, the pulley ratio between the upper first pulley 22a and the upper second pulley 23a and the pulley ratio between the lower first pulley 22b and the lower second pulley 23b are the same, and the following equation (1) expressed. R1: R3 = R2: R4 (1)

In the present embodiment, the upper first pulley 22a and the lower first pulley 22b have the same diameter (R1 = R2), and the upper second pulley 23a and the lower second pulley 23b have the same diameter (R3 = R4). However, this is merely an example, and the diameters of the upper first pulley 22a and the lower first pulley 22b may be different from each other, and the diameters of the upper second pulley 23a and the lower second pulley 23b may be different from each other. . Even in this case, the expression (1) may be satisfied. *

In the present embodiment, the upper first pulley 22a has a larger diameter than the upper second pulley 23a. For this reason, the rotation of the first motor 24a is decelerated and transmitted to the upper first pulley 22a. The lower first pulley 22b has a larger diameter than the lower second pulley 23b. For this reason, the rotation of the second motor 24b is decelerated and transmitted to the lower first pulley 22b. As described above, the two

motors

24a and 24b are synchronized and driven at the same rotational speed in the same direction. Further, the pulley ratios of the first pulley 22 and the second pulley 23 connected to each other by the belt 25 are the same. For this reason, the first motor 24a and the second motor 24b complement each other to rotate the shaft 21a, and the washing tub 13 and the stirring blade 18 can be driven. *

FIG. 6 is a schematic cross-sectional view showing the relationship between the first and

second pulleys

22 and 23 and the belt 25 of the washing machine 1 according to the embodiment of the present invention. The structure in which the belt 25 is attached to the first pulley 22 and the structure in which the belt 25 is attached to the second pulley 23 are substantially the same. For this reason, in FIG. 6, the first pulley 22 and the second pulley 23 are drawn in one drawing for convenience. *

As shown in FIG. 6, the 1st pulley 22 and the 2nd pulley 23 have the groove part G in the side surface. The belt 25 is located in the groove part G. Specifically, the belt 25 is fitted into the groove portion G while being in contact with the inner surface of the groove portion G. By providing the groove portion G, the vertical gap between the upper belt 25a and the lower belt 25b can be increased, so that the possibility that the two

belts

25a and 25b come into contact with each other can be reduced. Moreover, when the groove part G is provided, since the width of the belt 25 can be made the width of the groove part G, the usage amount of the belt 25 can be reduced. *

As shown in FIG. 6, in detail, the belt 25 and the groove part G are trapezoidal in cross section. In this configuration, for example, the contact area between the belt 25 and the

pulleys

22 and 23 can be increased as compared with a case where the belt is a flat belt. That is, in this configuration, the ability to transmit the driving force of the motor 24 can be improved. *

In the present embodiment, the belt 25 having the trapezoidal cross section and the groove G have a configuration in which the width on the outer peripheral side is wider than that on the inner peripheral side. This is merely an example, and the belt 25 and the groove portion G having a trapezoidal cross section may have a configuration in which the width on the inner peripheral side is wider than that on the outer peripheral side. Thereby, it can be set as the structure which a belt does not come off easily from a groove part. Further, the belt and the groove may have other configurations. For example, the belt may not be a trapezoidal V-shaped belt, but may be a belt of various other shapes such as a flat belt. Moreover, the shape of the groove part G may be various other shapes, and the groove part may not be provided depending on the case. Further, the belt and the pulley may have a configuration in which a convex portion is provided on one side and a concave portion is provided on the other side so that the concave and convex portions mesh with each other. *

<2. Details of Arrangement of Multiple Motors> FIG. 7 is a schematic plan view showing the positional relationship of the multiple motors 24 included in the washing machine 1 according to the embodiment of the present invention. FIG. 7 is a view as seen from the lower side of the washing machine 1. FIG. 7 also shows the first pulley 22. *

The rotation axis AR1 of the first motor 24a is orthogonal to the plane S1 including the center axis CA and the rotation axis AR2 of the second motor 24b, and the rotation axis AR2 of the second motor 24b with the plane S2 including the center axis CA as a boundary surface. It is located on the opposite side area or on the boundary surface S2. In the present embodiment, the rotation axis AR1 of the first motor 24a is located in a region opposite to the rotation axis AR2 of the second motor 24b with respect to the boundary surface S2. As described above, when the number of motors is one, an imbalance occurs because the weight is biased toward the motor side arranged at a position away from the central axis CA in the radial direction. Vibration may occur. In this regard, in the washing machine 1 of the present embodiment, the plurality of motors 24 can be arranged with a good balance with respect to the central axis CA, and the occurrence of vibrations in the washing machine 1 can be suppressed. *

In the present embodiment, the plurality of motors 24 are located on the same circumference around the central axis CA. Specifically, the rotation axis AR1 of the first motor 24a and the rotation axis AR2 of the second motor 24b are located on the same circumference around the central axis CA. The radius of the circle where the plurality of rotation axes AR <b> 1 and AR <b> 2 is located is larger than the radius of the first pulley 22. According to such an arrangement of the motors 24, a plurality of motors 24 can be easily arranged with a good weight balance with respect to the central axis CA. *

In the present embodiment, the plurality of motors 24 are arranged at equal intervals in the circumferential direction. Specifically, the plurality of motors 24 are arranged at intervals of 180 ° in the circumferential direction. In other words, the first motor 24a and the second motor 24b are opposed to each other with the central axis CA interposed therebetween. According to such an arrangement of the motors 24, a plurality of motors 24 can be easily arranged with a good weight balance with respect to the central axis CA. In this configuration, the number of motors 24 can be reduced, and the manufacturing cost can be suppressed. *

Furthermore, in this embodiment, the weights of the plurality of motors 24 are the same. Specifically, the first motor 24a and the second motor 24b have the same weight. Thereby, since the motor 24 is arranged with a good weight balance with respect to the central axis CA, the design can be easily performed. *

The plurality of motors 24 may not be located on the same circumference centered on the central axis CA. The plurality of motors 24 may not be arranged at equal intervals in the circumferential direction. The first motor 24a and the second motor 24b may be 90 ° or more apart from the central axis CA. In FIG. 7, when the rotation axis AR1 of the first motor 24a is changed to a configuration that is located on the boundary surface S2, the first motor 24a and the second motor 24b are separated from each other by 90 ° as viewed from the central axis CA. Even in such a configuration, for example, the weight balance can be adjusted by setting the plurality of motors 24 to have different weights. For example, it is possible to adjust the weight by changing the configuration of the mounting legs 243 among the plurality of motors 24. *

<3. First Modification> In the above, the number of the plurality of motors 24 that rotate the second pulley 23 in the same direction at the same rotational speed is two. This is an example, and the number of the plurality of motors 24 may be three or more. The number of first pulleys 22 and second pulleys 23 may be changed in accordance with the change in the number of motors 24. When any two motors selected from the plurality of motors are the first motor and the second motor, it is only necessary that there are two motors arranged at positions satisfying the following requirement 1 or 2. Requirement 1: The rotation axis of the first motor is orthogonal to the plane including the central axis CA and the rotation axis of the second motor and is on the opposite side of the rotation axis of the second motor with the plane including the central axis CA as a boundary surface. Located in the area. Requirement 2: The rotation axis of the first motor is located on the boundary surface. *

FIG. 8 is a schematic plan view showing the positional relationship between the plurality of motors 24 included in the washing machine 1 according to the first modification. FIG. 8 is a view as seen from the lower side of the washing machine 1. FIG. 8 also shows the first pulley 22. In the first modification, the number of the plurality of motors 24 is four. *

All four motors 24 preferably have the same weight. As shown in FIG. 8, the four motors 24 are preferably located on the same circumference around the central axis CA, and are arranged at 90 ° intervals in the circumferential direction. In the configuration of the first modification, the above requirement 1 or 2 is satisfied even when any two motors are selected from the four motors 24. In the first modification, the plurality of motors 24 can be arranged with good balance with respect to the central axis CA, and the occurrence of vibrations in the washing machine 1 can be suppressed. The number of the plurality of motors 24 may be five or more. In this case, for example, when a plurality of motors 24 are arranged at equal intervals in the circumferential direction, the interval between adjacent motors 24 is smaller than 90 ° when viewed from the central axis CA. Even in this case, there is a motor that satisfies the requirement 1 or 2, and the motor 24 can be arranged with good balance with respect to the central axis CA. *

<4. Second Modification> Above, the number of first pulleys 22 is the same as the number of motors 24. This is an example, and the number of first pulleys 22 may be different from the number of motors 24. FIG. 9 is a schematic plan view showing the relationship between the first pulley 22 and the second pulley 23 of the washing machine 1 according to the second modification. As shown in FIG. 9, in the second modification, the number of the first pulleys 22 is one. *

The first pulley 22 and the upper second pulley 23a are connected via an upper belt 25a. The first pulley 22 and the lower second pulley 23b are connected via a lower belt 25b. The upper second pulley 23a and the lower second pulley 23b have the same diameter. That is, the pulley ratio between the first pulley 22 and each of the plurality of second pulleys 23 is the same. *

Upper belt 2
Both the 5a and the lower belt 25b are in contact with the side surface of the first pulley 22. In the second modification, a groove portion G is provided on the side surface of the first pulley 22, and the two

belts

25 a and 25 b are fitted in the groove portion G and come into contact with the first pulley 22. In addition, the groove part G does not need to be provided.

In the second modification, the upper belt 25a is positioned above the lower belt 25b, and the two

belts

25a and 25b do not overlap. The upper belt 25a and the lower belt 25b have side portions that oppose each other in the vertical direction at a portion in contact with the first pulley 22. It is good also as a structure which provides a convex part in any one of the side parts which oppose, and provides a recessed part in the other, and the upper side belt 25a and the lower side belt 25b mesh. Thereby, wear due to friction between the belts can be suppressed. *

<5. Others> The configurations of the above-described embodiments and modifications are merely examples of the present invention. The configuration of the embodiment and the modification may be changed as appropriate without departing from the technical idea of the present invention. In addition, the above-described embodiment and a plurality of modification examples may be combined and implemented within a possible range. *

For example, in the embodiment described above, the case where the present invention is applied to a vertical washing machine in which the central axis CA of the washing tub 13 extends in the vertical direction has been described. The present invention is not limited to this, and may be applied to a horizontal washing machine in which the central axis of the washing tub extends in the horizontal direction. *

Moreover, in embodiment shown above, it was set as the structure which the washing machine 1 has the clutch unit 21 which switches rotation with the washing tub 13 and the stirring blade 18. FIG. The present invention is not limited to this, and can be applied to a washing machine having no clutch unit. *

Moreover, in embodiment shown above, it was set as the structure where the washing tub 13 serves as a dehydration tank. This is merely an example, and the present invention is applicable to, for example, a washing machine in which a washing tub and a dewatering tub are provided separately.

The present invention can be suitably used for, for example, a vertical electric washing machine.

1 Washing machine 12 Water tank 13 Washing tank 18 Stirring blade 21 Clutch unit 21 Clutch unit 22 1st pulley 22a Upper 1st pulley 22b Lower 1st pulley 23 2nd pulley 23a Upper 2nd pulley 23b Lower 2nd motor 24a 24b 2nd motor 25 belt 25a upper belt 25b lower belt 242 casing AR rotating shaft AR1 first motor rotating shaft AR2 second motor rotating shaft CA central shaft G groove S2 boundary

Claims

A washing machine having a washing tub,
A first pulley that rotates about a central axis of the washing tub;
A plurality of second pulleys coupled to the first pulley via a belt;
A plurality of motors for rotating the plurality of second pulleys at the same rotational speed in the same direction;
Have
The pulley ratio between the first pulley and each of the plurality of second pulleys is the same,
The plurality of motors include at least a first motor and a second motor,
The rotation axis of the first motor is orthogonal to the plane including the central axis and the rotation axis of the second motor, and is a region opposite to the rotation axis of the second motor with the plane including the central axis as a boundary surface. Alternatively, a washing machine located on the boundary surface.
The washing machine according to claim 1, wherein the plurality of motors are positioned on the same circumference around the central axis.
The washing machine according to claim 2, wherein the plurality of motors are arranged at equal intervals in the circumferential direction.
The plurality of motors is two,
The washing machine according to any one of claims 1 to 3, wherein the first motor and the second motor are opposed to each other across the central axis.
The washing machine according to any one of claims 1 to 4, wherein the weights of the plurality of motors are the same.
The washing machine according to any one of claims 1 to 5, wherein the motor is a brushless DC motor.
The washing machine according to any one of claims 1 to 6, wherein the motor has a resin casing.
The number of the first pulleys is the same as the number of the plurality of motors,
The washing machine according to any one of claims 1 to 7, wherein the plurality of first pulleys are arranged in an axial direction.
The first pulley and the second pulley have a groove on a side surface,
The washing machine according to any one of claims 1 to 8, wherein the belt is located in the groove.
The washing machine according to claim 9, wherein the belt and the groove have a trapezoidal cross section.
A stirring blade disposed coaxially with the washing tub at the inner bottom of the cylindrical washing tub having a bottom on one side in the axial direction;
A clutch unit provided around the central axis between the washing tub and the first pulley;
Further comprising
The washing machine according to any one of claims 1 to 10, wherein the clutch unit switches between an integral rotation of the washing tub and the stirring blade and a rotation of only the stirring blade.
A water tub for accommodating the washing tub;
The central axis extends in the vertical direction,
The washing machine according to any one of claims 1 to 11, wherein the first pulley, the plurality of second pulleys, and the plurality of motors are disposed below the water tank.