washing machine

Abstract

To provide a washing machine capable of achieving miniaturization.SOLUTION: A washing machine includes a motor 10, a rotary tub 4 and a water receiving tub 3. The motor includes a rotary shaft 40 which rotates around a central axis. The rotary tub is a bottomed cylindrical shape which opens on one side in the axial direction of the central axis. The rotary tub is connected to a rotary shaft. The rotary shaft rotates around the central axis. The water receiving tub stores the rotary tub. The water receiving tub includes a cylindrical part 3d and a bottom part 3e. The cylindrical part is a cylindrical shape whose center is the central axis. The bottom part covers an end part on the other side in the axial direction of the cylindrical part. The bottom part dents in a cone-shaped manner toward the one side in the axial direction with respect to an end surface on the other side in the axial direction. The motor includes a rotor 20 and a stator 30. The rotor is connected to the rotary shaft. The stator is fixed to a support surface facing the other side in the axial direction of the bottom part. The stator opposes to the rotor via a gap in the axial direction. The motor is positioned on the one side in the axial direction with respect to the end surface on the other side in the axial direction of the cylindrical part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a washing machine. [Background technology]

[0002] Conventionally, there has been known a washing machine in which a rotating tub that rotates around a central axis is rotated by a motor arranged on the rear side of a water receiving tub that houses the rotating tub. Patent Document 1 discloses a drum-type washing machine in which a cylindrical rotating drum with a bottom is installed in a water tub, and the rotating drum is driven to rotate by a motor arranged on the rear side of the water tub. In conventional washing machines, the motor protrudes significantly from the rear side of the water tub. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-213800 A Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the present invention is to provide a washing machine that can be made compact. [Means for solving the problem]

[0005] A washing machine according to an embodiment has a motor, a spin tub, and a water receiving tub. The motor has a rotating shaft that rotates around a central axis. The spin tub is cylindrical with a bottom that opens on one axial side of the central axis. The spin tub is connected to the rotating shaft. The spin tub rotates around the central axis. The water receiving tub accommodates the spin tub. The water receiving tub has a cylindrical portion and a bottom. The cylindrical portion is cylindrical with the central axis as its center. The bottom covers an end portion on the other axial side of the cylindrical portion. The bottom is recessed toward one axial side with respect to an end face on the other axial side of the cylindrical portion. The motor has a rotor and a stator. The rotor is connected to the rotating shaft. The stator is fixed to a support surface facing the other axial side of the bottom. The stator faces the rotor via a gap in the axial direction. The motor is located on one axial side of the end face on the other axial side of the cylindrical portion. The stator further includes a plurality of coils arranged in a circumferential direction and a plurality of coils arranged in a radial direction. outside The central axis is arranged in a circumferential direction and extends radially. outside facing Outer edge surface and at the bottom, a outer peripheral end face and a retaining surface for contacting the base and aligning the stator with the base. 。 [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a cross-sectional view of a washing machine according to one embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view of the motor according to the embodiment. [Diagram 3] FIG. 3 is a plan view of the stator according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, a motor and a washing machine according to an embodiment will be described with reference to the drawings. In the following description, components having the same or similar functions are denoted by the same reference numerals. In addition, duplicate descriptions of those components may be omitted.

[0008] FIG. 1 is a cross-sectional view of a washing machine having a motor according to the present embodiment. In the following description, the side of the installation surface of the washing machine, i.e., the vertically lower side, is defined as the lower side of the washing machine, and the opposite side of the installation surface, i.e., the vertically upper side, is defined as the upper side of the washing machine. In addition, left and right are defined based on the direction in which the washing machine is viewed from a user standing in front of the washing machine. In addition, the side closer to the user standing in front of the washing machine as viewed from the washing machine is defined as the "front", and the side farther away is defined as the "rear". In this specification, the "width direction" means the left-right direction in the above definition. In this specification, the "depth direction" means the front-rear direction in the above definition. In the drawings, the +X direction is the right direction, the -X direction is the left direction, the +Y direction is the rear direction, the -Y direction is the front direction, the +Z direction is the up direction, and the -Z direction is the down direction.

[0009] In the following description, the axial direction of the central axis J is simply referred to as the "axial direction." In this embodiment, the central axis J is disposed tilted downward from the front to the rear. Of the two sides in the axial direction, the direction facing forward and diagonally upward may be referred to as the "one axial side D1," and the direction facing rear and diagonally downward may be referred to as the "other axial side D2." Furthermore, the radial direction centered on the central axis J may be simply referred to as the "radial direction." Furthermore, the circumferential direction centered on the central axis J may be simply referred to as the "circumferential direction."

[0010] (washing machine) The washing machine 1 has a housing 2, a door 2a, a water receiving tub 3, a drum (rotating tub) 4, a motor 10, a water injection pipe 5, and a drain pipe 6. The washing machine 1 of this embodiment is a drum type washing machine.

[0011] The housing 2 is configured, for example, from steel plates and has an overall rectangular box shape. The housing 2 houses a water receiving tub 3, a drum 4, a motor 10, a water inlet pipe 5, and a drain pipe 6. The housing 2 forms the exterior of the washing machine 1. An entrance 2b is provided in a side wall panel disposed at the front of the housing 2. A door 2a is attached to the entrance 2b. The door 2a covers the entrance 2b.

[0012] The door 2a can be operated from the front by a user to either a closed state or an open state. When the door 2a is in the closed state, the entrance 2b is closed. When the door 2a is in the open state, the entrance 2b is opened.

[0013] Water receiving tank 3 is fixed to the inner surface of housing 2 via a suspension or the like. Water receiving tank 3 is cylindrical and disposed about central axis J. Water receiving tank 3 is disposed in an inclined state that slopes downward from the front to the rear.

[0014] The water receiving tank 3 has a cylindrical portion 3d centered on the central axis J, and a bottom portion 3e covering an opening on the other axial side D2 of the cylindrical portion 3d. In other words, the water receiving tank 3 is tubular with a bottom that opens on one axial side D1. A drum 4 is accommodated in the internal space of the water receiving tank 3. In addition, a stator 30 of a motor 10 is fixed to a surface of the bottom portion 3e of the water receiving tank 3 facing the other axial side D2. The opening on the one axial side D1 of the water receiving tank 3 is closed by a door 2a which can be opened and closed.

[0015] The bottom portion 3e extends radially inward from the end portion on the other axial side of the cylindrical portion 3d. The bottom portion 3e is recessed in a cone shape toward the one axial side D1 with respect to the end face 3t on the other axial side of the cylindrical portion 3d. The bottom portion 3e has a tapered portion 3g and a flat portion 3j. The tapered portion 3g is tapered about the central axis J. The tapered portion 3g inclines toward the one axial side D1 as it moves radially inward from the end portion on the other axial side D2 of the cylindrical portion 3d. The flat portion 3j is disposed radially inward of the tapered portion 3g. The flat portion 3j extends along a plane perpendicular to the central axis J. The flat portion 3j is circular when viewed from the axial direction. The stator 30 of the motor 10 is fixed to the flat portion 3j. The flat portion 3j is provided with a through hole 3h through which the rotating shaft 40 passes and a bearing holding portion 3p (see FIG. 2) described later.

[0016] The bottom portion 3e has a support surface 3k facing the other axial side. A plurality of ribs 3r extending radially relative to the central axis J are provided on the support surface 3k. The axial position of the tip surface of the rib 3r coincides with the axial position of the end surface 3t of the other axial side D2 of the cylindrical portion 3d. The support surface 3k is inclined in a cone shape radially inward, so that the protruding height of the ribs 3r relative to the support surface 3k decreases radially inward. The bottom portion 3e is reinforced by the ribs 3r.

[0017] The drum 4 has a drum cylindrical portion 4d centered on the central axis J, and a drum bottom portion 4e covering an opening on the other axial side D2 of the drum cylindrical portion 4d. In other words, the drum 4 is a bottomed cylinder that opens on one axial side D1. A rotating shaft 40 extending from the rotor 20 of the motor 10 is fixed to the drum bottom portion 4e. The drum 4 is connected to the rotating shaft 40 and rotates around the central axis J.

[0018] An opening on one axial side D1 of the drum 4 faces the entrance 2b. When the door 2a is open, the inside of the drum 4 is open to the front through the entrance 2b. Laundry is inserted into the drum 4 from the entrance 2b.

[0019] A plurality of through holes 4b are formed in the drum cylindrical portion 4d. The internal space of the drum 4 is connected to the external space of the drum 4 through the plurality of through holes 4b. Water introduced into the water receiving tank 3 enters the interior of the drum 4 through the through holes 4b.

[0020] A number of baffles 4a are fixed to the inner surface of the drum cylindrical portion 4d. Each of the baffles 4a moves in the circumferential direction about the central axis J as the drum 4 rotates. The laundry inside the drum 4 moves in the circumferential direction while being caught by each of the baffles 4a, and then falls due to gravity, thereby being agitated.

[0021] The drum bottom 4e faces the bottom 3e of the water receiving tank 3 in the axial direction. The drum bottom 4e is located on one axial side D1 of the bottom 3e of the water receiving tank 3. The drum bottom 4e extends in a cone-shaped recess along the bottom 3e of the water receiving tank 3. This allows the drum 4 to ensure a large internal capacity while minimizing interference with the bottom 3e of the water receiving tank 3.

[0022] The water filling pipe 5 is disposed above the water receiving tank 3. The water filling pipe 5 is connected to a water faucet via a water supply valve or the like. The water filling pipe 5 fills water into the water receiving tank 3. The drain pipe 6 is disposed at the bottom of the water receiving tank 3. A drain valve is provided in the drain pipe 6. The drain pipe 6 drains the water stored in the water receiving tank 3.

[0023] (Motor) Fig. 2 is a schematic cross-sectional view of the motor 10 of this embodiment. Fig. 3 is a plan view of the stator 30 of this embodiment.

[0024] As shown in FIG. 2, the motor 10 of this embodiment is an axial gap type motor. Generally, an outer rotor type motor in which a magnet is arranged radially outside a coil is used as a motor for rotating a drum of a washing machine. In an outer rotor type motor, when the axial dimensions of the coil and magnet are reduced in order to reduce the thickness, the opposing area between the coil and the magnet also becomes small, and there is a problem that it is difficult to obtain sufficient rotation speed and rotation torque. In contrast, in an axial gap type motor, it is easy to ensure a large opposing area between the coil and the magnet, and it is easy to increase the rotation speed and torque of the motor even when the motor is thinned. According to this embodiment, by adopting an axial gap type motor as the motor 10 for rotating the drum 4 of the washing machine 1, it is possible to thin the motor 10 while ensuring sufficient rotation speed and torque of the motor 10. By thinning the motor 10 arranged on the rear side of the water receiving tub 3, the space behind the water receiving tub 3 can be reduced, and the washing machine 1 can be made smaller in the front-rear direction.

[0025] The motor 10 comprises a rotor 20 that rotates about a central axis J, a rotating shaft 40 connected to the rotor 20, a stator 30 that faces the rotor 20 with a gap in the axial direction of the central axis J, and a bearing 9.

[0026] As shown in FIG. 1, motor 10 is disposed on the other axial side of bottom 3e of water receiving tub 3. Motor 10 is located on one axial side D1 of end face 3t on the other axial side D2 of cylindrical portion 3d of water receiving tub 3. According to this embodiment, motor 10 can be disposed inside a cone-shaped recess in bottom 3e, and motor 10 can be prevented from protruding to the other axial side D2 of water receiving tub 3. This makes it possible to maximize the internal capacity of water receiving tub 3 and drum 4 housed in water receiving tub 3 while reducing the overall arrangement space for water receiving tub 3 and motor 10. As a result, the dimension of washing machine 1 in the front-to-rear direction can be reduced, and the installation space for washing machine 1 can be reduced.

[0027] (Stator) As shown in Fig. 2, the stator 30 faces the rotor 20 with a gap in the axial direction. The stator 30 is fixed to a support surface 3k facing the other axial side of the bottom portion 3e. The stator 30 has an annular shape centered on a central axis line J. The stator 30 has a stator core 31, a plurality of coils 35, and a stator holding portion (holding portion) 39.

[0028] The stator core 31 has a core back portion 32 and a plurality of teeth portions 33. The core back portion 32 is annular plate-shaped along a plane centered on the central axis J and perpendicular to the axial direction. The plurality of teeth portions 33 protrude toward the other axial side D2 from a surface of the core back portion 32 facing the other axial side D2. As shown in FIG. 3, the plurality of teeth portions 33 are arranged at equal intervals along the circumferential direction of the central axis J. The teeth portions 33 are fan-shaped with the central axis J as the center when viewed in the axial direction.

[0029] As shown in FIG. 2, the coil 35 is wound around the teeth portion 33. An insulator (not shown) is disposed between the coil 35 and the teeth portion 33. The insulator is, for example, bobbin-shaped. The coil 35 is attached to each of the teeth portions 33. The coils 35 are arranged in the circumferential direction. The ends of the coils 35 are drawn out from the stator 30 and connected to a power supply device. This allows a current to flow through the coils 35. Each coil 35 is wound around an axis parallel to the central axis J. Therefore, the coils 35 form magnetic poles in the axial direction when a current is passed through them. That is, the coils 35 form magnetic poles on the rotor 20 side that faces them in the axial direction.

[0030] The stator holding portion 39 is made of an insulating resin material. The stator holding portion 39 is formed by insert molding in which the stator core 31 and the multiple coils 35 are embedded. The stator holding portion 39 has a coil covering portion 39a that covers the coils 35, a front covering portion 39b that covers the surface of the core back portion 32 facing the one axial side D1, and an insertion portion 39c and a screw fastening portion 39e that protrude radially outward from the front covering portion 39b. The stator holding portion 39 also exposes the tip surface 33a of the teeth portion 33 that faces the other axial side D2. The stator holding portion 39 holds the stator core 31 and the multiple coils 35, and insulates the stator core 31 and the multiple coils 35 from other members.

[0031] The front covering portion 39b of the stator holding portion 39 contacts the support surface 3k of the bottom 3e of the water receiving tank 3. That is, the stator 30 contacts the bottom 3e. The water receiving tank 3 has a large heat capacity, and is cooled by water stored inside. According to this embodiment, by bringing the stator 30 into contact with the water receiving tank 3, the heat of the stator 30 is transferred to the water receiving tank 3 to cool the stator 30, and the stator 30 can be operated stably.

[0032] As shown in Fig. 3, the stator holding portion 39 of this embodiment is provided with three insertion portions 39c and one screw fastening portion 39e. The three insertion portions 39c protrude radially outward from the front covering portion 39b, which is circular when viewed from the axial direction. That is, the stator 30 has a plurality of insertion portions 39c protruding radially outward. The three insertion portions 39c are arranged side by side at equal intervals along the circumferential direction. The insertion portion 39c extends in an arc shape in the circumferential direction with respect to the central axis J.

[0033] The insertion portion 39c is provided with an outer peripheral end surface 39d facing radially outward. That is, the stator 30 has the outer peripheral end surface 39d. The outer peripheral end surface 39d is an arc-shaped surface extending in the circumferential direction of the central axis.

[0034] Three fitting portions 7 are provided on the bottom 3e of the water receiving tank 3. The fitting portions 7 extend in an arc shape along the circumferential direction centered on the central axis J. The three fitting portions 7 are disposed at equal intervals along the circumferential direction.

[0035] The fitting portion 7 has an arc portion 7a and a visor portion 7b. The arc portion 7a protrudes from the support surface 3k of the bottom portion 3e toward the other axial side D2. The arc portion 7a extends in an arc shape along the circumferential direction. The arc portion 7a is provided with a holding surface 7c facing radially inward. That is, the bottom portion 3e has the holding surface 7c. The visor portion 7b extends radially inward from the end of the arc portion 7a on the other axial side D2. The visor portion 7b faces the support surface 3k in the axial direction. The axial gap dimension between the visor portion 7b and the support surface 3k is approximately equal to the axial thickness dimension of the insertion portion 39c.

[0036] The three insertion portions 39c of the stator 30 are inserted into different fitting portions 7. As a result, the insertion portions 39c are sandwiched between the support surface 3k and the eaves portion 7b. Furthermore, with the insertion portions 39c inserted into the fitting portion 7, the outer peripheral end faces 39d of the insertion portions 39c come into contact with the holding surface 7c of the fitting portion 7. The outer peripheral end face 39d and the holding surface 7c are both arc surfaces centered on the central axis J. The holding surface 7c comes into contact with the outer peripheral end face 39d to axially align the stator 30 with the bottom portion 3e.

[0037] As shown in Fig. 2, the screw fastening portion 39e is plate-shaped along a plane perpendicular to the axial direction. The screw fastening portion 39e is provided with a through hole 39f penetrating in the axial direction. A fixing screw 34 is inserted into the through hole 39f. The fixing screw 34 is inserted into a screw hole 3f provided in the bottom 3e of the water receiving tub 3. In this way, the screw fastening portion 39e is screwed to the bottom 3e. The screw fastening portion 39e functions as an anti-rotation mechanism 8 that limits the rotation of the stator 30 relative to the bottom 3e.

[0038] Here, an assembly procedure for fixing the stator 30 to the bottom portion 3e of the water receiving tank 3 will be described with reference to FIGS. First, the worker (or the assembling device) assembling the washing machine 1 brings the stator 30 into contact with the support surface 3k of the bottom portion 3e from the other axial side D2. At this time, the insertion portion 39c is positioned between the fitting portions 7 adjacent in the circumferential direction. Next, the worker rotates the stator 30 to one side or the other side in the circumferential direction. As a result, the insertion portion 39c of the stator 30 is inserted into the fitting portion 7. Next, the worker aligns the through hole 39f of the screw fastening portion 39e with the screw hole 3f of the bottom portion 3e, and fastens the screw fastening portion 39e with the fixing screw 34. As a result, the stator 30 and the bottom portion 3e are fixed to each other.

[0039] According to this embodiment, the stator 30 and the bottom portion 3e can be axially aligned by bringing the outer peripheral end surface 39d of the stator 30 and the holding surface 7c of the bottom portion 3e into contact with each other. According to this embodiment, the stator 30 and the bottom portion 3e can be axially aligned in a simple process without using a jig or the like, and the assembly process of the washing machine 1 can be simplified.

[0040] The motor 10 of this embodiment is an axial gap type. Therefore, compared to an outer rotor type motor of a conventional structure, the rotor 20 is not disposed radially outside the coil 35. Therefore, in the stator 30 of this embodiment, it is not necessary to dispose the surface used for axial alignment with the bottom 3e (the outer peripheral end face 39d in this embodiment) axially shifted relative to the coil 35. According to this embodiment, the outer peripheral end face 39d of the stator 30 is disposed radially outside the coil 35. The axial position of the outer peripheral end face 39d overlaps with the axial position of the coil 35. According to this embodiment, the motor 10 can be made smaller in the axial direction.

[0041] According to this embodiment, by inserting the insertion portion 39c into the fitting portion 7, the outer circumferential end surface 39d of the insertion portion 39c can be brought into contact with the holding surface 7c of the fitting portion 7. In particular, according to this embodiment, since the fitting portion 7 is open on both circumferential sides, the worker can easily fit the insertion portion 39c into the fitting portion 7 by rotating the insertion portion 39c. According to this embodiment, the assembly process of the stator 30 to the bottom portion 3e can be simplified.

[0042] According to this embodiment, the fitting portion 7 has the eaves portion 7b arranged on the other axial side of the insertion portion 39c while holding the insertion portion 39c. The eaves portion 7b sandwiches the insertion portion 39c between itself and the support surface 3k. This allows the fitting portion 7 to position the stator 30 in the axial direction with respect to the bottom portion 3e.

[0043] According to this embodiment, a rotation prevention mechanism 8 is provided between the stator 30 and the bottom 3e, thereby suppressing relative rotation between the stator 30 and the bottom 3e, and the stator 30 and the bottom 3e can be fixed in place in a simple process.

[0044] The anti-rotation mechanism 8 of this embodiment has a screw-fastened portion 39e that protrudes radially outward from the stator 30 and is screwed to the bottom portion 3e. However, the anti-rotation mechanism 8 may have another structure. The anti-rotation mechanism 8 may be anything that can limit the rotation between the bottom portion 3e and the stator 30, and may be, for example, a snap fit that is provided on the bottom portion 3e side and engages with a part of the stator 30 to limit the rotation of the stator 30.

[0045] As shown in FIG. 2, a bearing retaining portion 3p is disposed radially inside the stator 30. The bearing retaining portion 3p is provided in the center of the bottom portion 3e of the water receiving tank 3. The bearing retaining portion 3p is cylindrical and centered on the central axis J. The bearing retaining portion 3p retains the bearing 9 on its inner surface. The bearing retaining portion 3p surrounds, from the radial outside, the through hole 3h through which the rotating shaft 40 passes. The stator 30 is disposed radially outside the bearing retaining portion 3p.

[0046] In this embodiment, the end face of the other axial side D2 of the stator 30 is the tip face 33a of the teeth portion 33. The tip face 33a of the teeth portion 33 is located on one axial side of the end face of the bearing 9 on the other axial side. According to this embodiment, the stator 30 can be disposed closer to the bottom 3e of the water receiving tank 3. Accordingly, the rotor 20 that axially faces the stator 30 can also be disposed closer to the one axial side D1, thereby making it possible to miniaturize the entire motor 10.

[0047] (Rotor) The rotor 20 is located on the other axial side D2 of the stator 30. That is, the rotor 20 is disposed on the other axial side of the coil 35. The rotor 20 is connected to the rotating shaft 40. As described above, the stator 30 is fixed to the bottom 3e of the water receiving tub 3. The drum bottom 4e of the drum 4, the bottom 3e of the water receiving tub 3, the stator 30, and the rotor 20 are arranged in this order from the one axial side D1 toward the other axial side D2.

[0048] The rotating shaft 40 extends about the central axis J. The rotating shaft 40 is fixed to the rotor 20 and rotates together with the rotor 20 about the central axis J. The rotating shaft 40 is rotatably supported by the bottom 3e of the water receiving tank 3 via a bearing 9. The rotating shaft 40 is also fixed at an end on one axial side D1 to the drum bottom 4e of the drum 4. That is, the rotor 20 is fixed to the drum bottom 4e of the drum 4 via the rotating shaft 40. The torque of the rotor 20 is transmitted to the drum 4 via the rotating shaft 40.

[0049] The rotor 20 has a back yoke 21, a plurality of magnets 24, and a rotor holding portion 29. The rotor 20 is annular about a central axis J. The back yoke 21 is located on the other axial side D2 of the magnets 24. The rotor 20 is fixed to a rotating shaft 40 at the back yoke 21.

[0050] The rotor holding portion 29 is formed by insert molding in which the back yoke 21 and the plurality of magnets 24 are embedded. The rotor holding portion 29 holds the back yoke 21 and the plurality of magnets 24.

[0051] The magnets 24 are arranged in a circumferential direction centered on the central axis J. The axial direction of the magnets 24 is the magnetic pole direction. The magnets 24 arranged in the circumferential direction are arranged with N poles and S poles alternately inverted. The magnets 24 are held by a rotor holding portion 29.

[0052] In this embodiment, the magnet 24 is a ferrite magnet, but the magnet 24 may also be other types of magnets (e.g., rare earth magnets such as neodymium magnets).

[0053] The magnet 24 may be an anisotropic magnet or an isotropic magnet. When the magnet 24 is an anisotropic magnet, the easy axis of magnetization of the magnet 24 is set in the axial direction, thereby increasing the overall magnetic force of the magnet 24 in the axial direction. On the other hand, when an isotropic magnet is used as the magnet 24, the rotor 20 can be manufactured more cheaply than when an anisotropic magnet is used.

[0054] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention.

[0055] For example, in the above-described embodiment and modified examples, the magnets of the rotor may be arranged in a Halbach array, in which case the magnetic flux of the rotor can be concentrated on the stator side, thereby further increasing the driving torque of the rotor.

[0056] In the above embodiment, a drum-type washing machine is exemplified as a washing machine adopting the configuration of the present invention. However, the configuration of the present invention may be adopted in a vertical washing machine.

[0057] In the above embodiment, a direct drive washing machine in which the rotating shaft transmits the rotation of the rotor directly to the drum has been described. However, the washing machine may have a structure in which the rotating shaft has a speed reduction mechanism such as a planetary gear mechanism inside and transmits the rotation of the rotor 20 to the drum 4 after reducing the speed. [Explanation of symbols]

[0058] 1...washing machine, 3...water receiving tub, 3d...cylindrical portion, 3e...bottom, 3k...support surface, 3t...end surface, 4...drum (rotating tub), 7...fitting portion, 7a...arc portion, 7b...eaves portion, 7c...holding surface, 8...rotation prevention mechanism, 9...bearing, 10...motor, 20...rotor, 30...stator, 35...coil, 39c...insertion portion, 39d...outer peripheral end surface, 40...rotating shaft, D1...one axial side, D2...other axial side, J...central axis

Claims

1. a motor having a rotating shaft that rotates about a central axis; a rotating tub having a bottom and an opening on one axial side of the central axis, the rotating tub being connected to the rotating shaft and rotating around the central axis; A water receiving tank that accommodates the rotating tank, The water receiving tank is A cylindrical portion having the central axis as a center; a bottom portion that covers an end portion on the other axial side of the cylindrical portion and is recessed toward one axial side with respect to an end surface on the other axial side of the cylindrical portion, The motor is A rotor connected to the rotating shaft; a stator fixed to a support surface facing the other axial side of the bottom portion and facing the rotor with a gap in the axial direction, the motor is located on one axial side of the other axial end face of the cylindrical portion, The stator includes: A plurality of coils arranged along a circumferential direction; an outer circumferential end surface disposed radially outward of the coil and extending along a circumferential direction of the central axis and facing radially outward; The bottom portion has a retaining surface facing radially inward and contacting the outer peripheral end surface to axially align the stator with the bottom portion. washing machine.

2. A bearing is provided to rotatably support the rotating shaft, The bearing is held by the bottom, an end portion of the stator on the other axial direction is located on one axial side of an end portion of the bearing on the other axial direction; The washing machine according to claim 1.

3. the stator has a plurality of insertion portions that protrude radially outward and are provided with the outer circumferential end surface, the bottom portion has a plurality of fitting portions into which the insertion portions are inserted, The fitting portion is an arc portion protruding from the support surface to the other axial direction and extending along a circumferential direction, the arc portion being provided with the holding surface; a visor portion extending radially inward from an end portion on the other axial side of the arc portion and sandwiching the insertion portion between the visor portion and the support surface, The washing machine according to claim 1 or 2.

4. A rotation prevention mechanism is provided between the stator and the bottom portion to limit rotation of the stator relative to the bottom portion. The washing machine according to any one of claims 1 to 3.

5. The anti-rotation mechanism has a protrusion that protrudes radially outward from an outer periphery of the stator and is screwed to the bottom. The washing machine according to claim 4.

Images