JP2000334194A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily change a rotational driving power transmission structure to a washing machine which is of a type to directly rotationally drive a drum by a motor and which is of specifications varying in a washing capacity and dehydrating and rotating speeds. SOLUTION: This washing machine is formed with the rotor 61 and a drum shaft 55 by forming a connector 70 which is a connecting part of the rotor 61 of the motor 60 as a separate component or forming a connecting receiver 72 which is the connecting part of the drum shaft 55 as a separate component, thereby changing the connector 70 or the connecting receiver 72. As a result, the change of the rotational driving power transmission structure to the drum type washing machine of the specifications varying the washing capacity and dehydrating and rotating speeds is made possible.

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 having a so-called direct drive structure.

[0002]

2. Description of the Related Art Conventionally, in a drum type washing machine,
As shown in FIG. 7, a water tank 2 is elastically supported by a plurality of sets of suspensions 3 inside an outer box 1, and a drum 4 is rotatably arranged inside the water tank 2. or,
A drum shaft 5 attached to the drum 4 is supported by bearings 7 and 8 held by a bearing housing 6 attached to the water tank 2, and a driven pulley 9 is connected to an end of the drum shaft 5 on the side opposite to the drum 4. Have been.

On the other hand, a motor support 1 is provided on the outer lower surface of the water tank 2.
0 is attached, and a motor 11 is attached to the motor support 10. The rotation shaft 12 of the motor 11
The drive pulley 13 is attached to the
A belt 14 is stretched between the driven pulley 9 and the driven pulley 9.

With this structure, the rotational driving force of the motor 11 is
The rotation is transmitted from the rotation shaft 12 to the drive pulley 13, the belt 14, and the driven pulley 9 in this order, so that the drum shaft 5 is rotated with the drum 4, and the rotation of the drum 4 causes washing and dehydration of the laundry. Has become.

However, in this case, the motor 1
In order to transmit one rotation driving force to the drum shaft 5 and the drum 4, components of the driving pulley 13, the belt 14, and the driven pulley 9 are required, and the cost is increased. In addition, the driving pulley 13, the belt 14, and the driven pulley 9 individually generate vibrations, and when they are integrated, a considerable amount of driving vibrations is generated. Further, between the driving pulley 13 and the belt 14 and between the belt 14 and the driven pulley 9, the belt 14 is likely to slip particularly at high speed rotation. There was noise.

On the other hand, recently, as shown in FIG.
A motor 21 is provided at the back of the water tank 2 and a rotor 22
Is connected to the end of the drum shaft 5 on the side opposite to the drum 4, and with this structure, the drum 4 is directly driven to rotate by the motor 21 (direct drive).

According to this, the drum 4 has the motor 2
Since the rotation power is transmitted directly, there is no need for a belt transmission mechanism as in the prior art. Therefore, the drive device can be simplified accordingly, and cost reduction can be achieved. Further, since individual vibrations due to parts of the belt transmission mechanism are not generated, and furthermore, the belt is not slipped at the time of high-speed rotation, it is possible to achieve a reduction in operation vibration and noise. .

[0008]

Among the various types of washing machines, there are washing machines having different washing capacities and different spinning speeds. This is the same with the above-mentioned drum type washing machine. Among the drum type washing machines, in the case of the specification having a large washing capacity, the drum 4 itself becomes large, and the drum 4 which accommodates more laundry and becomes heavier is used. Because of the need to rotate, a larger transmission torque of rotational power is required,
The connection structure of the driven pulley 9 or the rotor 22 to the drum shaft 5 needs to be changed.

On the other hand, in the case of the specification having a high spin-drying speed, the drum shaft 5 is required to withstand the faster rotation of the drum 4.
Therefore, the diameter of the drum shaft 5 becomes large, and in particular, in the specification having a higher spin-drying speed, the diameter of the drum shaft 5 becomes larger and the transmission torque of the rotating power becomes larger. Therefore, the connection structure of the driven pulley 9 or the rotor 22 to the drum shaft 5 needs to be changed.

The connection structure between the driven pulley 9 and the drum shaft 5 can be changed by cutting the connection between the driven pulley 9 and the drum shaft 5 of the driven pulley 9 generally formed by aluminum die casting. It is easy. However, if the connection between the rotor 22 of the motor 21 and the drum shaft 5 is changed by the same cutting, the air gap 2 between the rotor 22 and the stator 23 (see FIG. 8) can be reduced.
Since the accuracy of the motor 21 is affected, for example, when the dimensions of the rotor 4 are out of order, it is impossible to do so, and it is difficult to change the connecting portion of the rotor 22.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and therefore has as its object the main purpose of rotating a drum directly by a motor and rotating the drum to one having a different washing capacity and a different spinning speed. An object of the present invention is to provide a drum type washing machine in which a power transmission structure can be easily changed.

[0012]

In order to achieve the above object, in a drum type washing machine of the present invention, first, a water tank elastically supported inside an outer box and a water tank of the water tank are provided. A drum rotatably disposed therein, a drum shaft attached to the drum, and a back portion of the water tank, and a rotor connected to the drum shaft by a connecting portion of the drum to directly rotate the drum And a connecting part of the rotor is formed as a separate part (the invention of claim 1).

According to this, by changing the connecting portion of the rotor as a separate part to form the rotor, it is possible to change the rotational power transmission structure to one having a different washing capacity and a different spinning speed. . In this case, the connecting portion of the rotor is
It is preferable to integrate the rotor with the rotor by insert molding with plastic (the invention of claim 2). By doing so, it is possible to easily integrate the connecting portion of the rotor.

In the drum type washing machine of the present invention, the second
A water tank disposed elastically supported inside the outer box, a drum rotatably disposed inside the water tank, a drum shaft attached to the drum, and provided on the back of the water tank;
A rotor is connected to the drum shaft by a connecting portion thereof, and a motor that directly rotates and drives the drum;
The connecting portion of the drum shaft is formed as a separate component (the invention of claim 3).

According to this, the drum shaft is formed by changing the connecting portion of the drum shaft which is a separate component,
The rotation power transmission structure can be changed to one with a different washing capacity or dehydration rotation speed. In this case, the connecting portion of the drum shaft is preferably press-fitted into the drum shaft and integrated therewith.
In this way, the integration of the connecting portion of the drum shaft can be facilitated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.
This will be described with reference to FIGS. First, FIG.
The outer box 31 of the entire drum-type washing machine is shown. The outer box 31 has a laundry entrance 32 at a substantially central portion on a front portion, and a work port 33 at a substantially central portion on a rear portion. A door 34 is provided at the laundry entrance 32 so that the door 34 can be opened and closed.
, A back plate 35 is detachably provided.

Inside the outer box 31, a water tank 36 is disposed elastically supported by a support plate 37 and a plurality of sets, for example, four sets (only two sets are shown) of suspensions 38. The water tank 36 has a drum shape, and is disposed inside the outer box 31 in a horizontal axis shape in which the axial direction is forward and backward. Further, the water tub 36 has a connection port 39 substantially at the center of the front end plate portion, and this is connected to the laundry entrance 32 of the outer box 31 by a bellows 40. On the other hand, a drain port (not shown) is formed at the bottom of the water tank 36, and the drain valve 4
1 and a drain hose 42 is connected to the drain valve 41.

A drum 43 is provided inside the water tank 36. The drum 43 has a smaller diameter than the water tub 36, and functions as a washing tub, a dehydration tub, and also functions as a drying tub.
Inside, is arranged rotatably in the form of a horizontal axis whose axial direction is the same as the water tank 36. Also, this drum 4
The body of No. 3 has holes 44 for dehydration and ventilation.
Is formed in almost the entire area (only a part is shown).

FIG. 1 shows the drive unit of the drum 43 in detail. As is apparent from FIG. 1, for example, a plurality of (partially shown) bolts 46 are attached to a rear end plate portion, which is a rear wall of a plastic water tank 36, with a reinforcing plate 45 made of metal such as stainless steel. Is stuck. Also, a plurality of drum supports 47 (1 in FIG. 2) are attached to a rear end plate portion, which is a rear wall of a metal drum 43 made of, for example, stainless steel. (Only the book is shown).

A housing insertion hole 4 is provided in each of the center of the rear end plate of the water tank 36 and the center of the reinforcing plate 45.
9 and 50, into which a cylindrical bearing housing 51 is inserted from the rear, and a plurality of mounting portions 51a (only one is shown) protruding outward from the bearing housing 51 thereon. The bolt 52 is fixed to the reinforcing plate 45. In the bearing housing 51, the bearing 5 is set in advance.
3, 54 are press-fitted back and forth.

On the other hand, a metal drum shaft 55 is fixed to the center of the rear end plate of the drum 43 with a plurality of (only one is shown) bolts 56 sandwiching the center of the drum support 47. I have. A cap 57 for covering each head of the bolt 56 is provided on the drum shaft 55 with a screw 58 between the center of the rear end plate of the drum 43 and the center of the drum support 47.
It is attached by. With this structure, the bearings 53, 54
A drum shaft 55 is inserted from the front into the inside, and the drum 43 is rotatably supported via the drum shaft 55.

The housing insertion hole 4 of the water tank 36 is provided.
Between the bearing 9 and the bearing housing 51, a seal 59 for sealing the space between them and the peripheral surface of the drum shaft 55 in a watertight manner is previously sandwiched.

Then, as described above, the bearing housing 51
Is mounted on the back of the water tank 36 that supports the drum 43,
The motor 60 is attached. This motor 60 is, for example, a brushless motor of an outer rotor type in which a rotor 61 is positioned outside a stator 62 and rotates. The stator 62 has a laminated iron core 63 and a winding core mounted thereon via a bobbin 64. And a line 65. The stator 62, especially the laminated iron core 63, is attached to the attachment portion 51 a of the bearing housing 51 by a plurality of bolts 66 (only one is shown).

On the other hand, the rotor 61 is
7 and a yoke 68 fixed to the outer peripheral surface of the rotor housing, and a magnet 69 fixed to the inner peripheral surface of the rotor housing 67 with one pole and one pole. Numeral 67 designates a metal connector 70 disposed at the center, a metal frame 71 disposed at the periphery thereof, and insert molding for molding these peripheral portions with plastic. The connector 70 and the frame 71 are integrated by insert molding.

Here, FIG. 3 shows the connecting member 70 alone. The connecting member 70 has a substantially cylindrical shape and has flat surfaces 70a on opposite sides of the inner peripheral surface. On the other hand, FIG. 4 shows a metal connection receiver 72 corresponding to the connection tool 70.
The connection receiving member 72 has a substantially cylindrical shape,
A flat surface 72a is provided on opposite sides of the outer peripheral surface on one end side (right side in the figure). In addition, the coupling receiver 72 includes:
A screw portion 72b is provided on the outer peripheral surface at one end other than the flat surface 72a.
And a tapered portion 72c is formed at the other end.

On the other hand, as shown in FIG. 1, a connection receiving hole 73 is formed at the rear end of the drum shaft 55, and the connection receiving hole 72 is formed in the connection receiving hole 73. By press-fitting the other end side from the tapered portion 72c and attaching,
The coupling holder 72 is integrated with the drum shaft 55.

As a result, one end of the coupling holder 72 projecting rearward from the rear end of the drum shaft 55
The flat surface 70a is aligned with the flat surface 72a, and the connecting member 70 of the rotor 61 is fitted. Then, the nut 75 is inserted into the external thread portion 72b of the connecting receiving member 72 protruding from the connecting member 70 via the washer 74. Are screwed and fastened to connect the rotor 61 to the connection receiving member 72 and, consequently, to the drum shaft 55. Therefore, the connecting member 70 functions as a connecting portion of the rotor 61, and the connecting receiving member 72 functions as a connecting portion of the drum shaft 55, and is a separate component from the rotor 61 and the drum shaft 55, respectively. is there.

A rotation sensor 76 as a detecting means for detecting the rotation of the drum 43 is attached to the laminated iron core 63 of the stator 62 of the motor 60. This rotation sensor 76
Is, for example, a Hall IC, which faces the magnet 69 of the rotor 61.
, The rotation of the rotor 61 and thus the rotation of the drum 43 are detected.

The washing machine according to the present embodiment is
The controller 77 (see FIG. 2) for detecting the amount of laundry, the amount of dry laundry, or the amount of imbalance based on the detection result, and controlling the operation based on the detection result. Equipped on the front upper part of the outer box 1. Further, the washing machine of the present embodiment not only performs washing and dehydration of the laundry, but also performs drying. Although not shown, for example, a blowing device, a dehumidifying device, a heater, and the like for the drying are provided. It has a drying function part.

Next, the operation of the above configuration will be described. When the laundry is washed, dehydrated, or dried, the motor 60 is energized by the winding 65 to rotate the rotor 61.
And the rotation of the rotor 61 is transmitted to the drum shaft 55 via an engagement structure between the flat surface 70a of the connecting member 70 and the flat surface 72a of the connecting receiving member 72, so that the drum 43 is moved together with the drum shaft 55. Is directly driven to rotate.

As described above, according to the present configuration, the motor 60
Is directly connected to the drum shaft 55, and the drum 43
, And does not require a driving pulley, a belt, and a driven pulley unlike the conventional one. Therefore, the number of parts used can be reduced correspondingly, the drive device can be simplified, and the cost can be reduced. Also, the assembly of the driving pulley, belt and driven pulley is unnecessary,
Ease of assembly can be achieved. At the same time, the conventional drive pulley, belt, and driven pulley do not generate individual vibrations, and further, do not generate swinging due to belt slip during high-speed rotation. Noise reduction can be achieved.

FIGS. 5 and 6 show the contents of the change of the specification. Among them, FIG. 5 shows the contents of the case where the washing capacity is increased even in the specification change, where (a) is a small capacity and (b) is a large capacity. In this case, the dehydration rotation speed is the same, and the drum shaft 5
The diameter of 5 is the same d1. On the other hand, when the size of the flat surface 70a is large, the connecting tool 70 is larger than that of the small capacity, and the rotor 61 is formed. The connecting tool 70 has an increased inner diameter). In connection with this, as for the connection receiving member 72, a flat surface 72a having a large size or a larger size when the flat surface 72a has a small capacity is used, and is used for the drum shaft 55.
(For this reason, the connection receiving member 72 for a large capacity)
Has a large diameter at the portion where the flat surface 72a exists).

This is because, as described above, in the case of the specification having a large washing capacity, the drum 43 itself becomes large, and it is necessary to rotate the drum 43 which accommodates more laundry and becomes heavier. This is because a larger transmission torque of the rotational power is required, and by increasing the size of the flat surface 70a of the connection tool 70 and the flat surface 72a of the connection receiving tool 72, that is, the size of the power transmission unit,
Transmission of rotational power of a large-capacity specification can be performed without any problem. In this case, the magnet 6 of the rotor 61
9 is also changed to a motor that generates a larger torque, but a motor that generates a larger torque may be used for the motor 60 in advance.

On the other hand, FIG. 6 shows the contents when the spinning speed is increased, and FIG.
(B) is a medium rotation speed (for example, about 1000 [rpm])
In the case of (c), the high rotation speed (for example, 1000 [rpm]
m] or more). As described above, in the specification having a high spin-drying rotation speed, the drum shaft 55 needs to have high strength in order to withstand the faster rotation of the drum 43, and the diameter of the drum shaft 55 becomes large. In the case of the rotation speed, the diameter is d3, whereas in the case of the medium rotation speed, the diameter becomes d4, and in the case of the high rotation speed, the diameter becomes d5.

In this case, the washing capacity is the same. For example, by setting the small capacity as described above, the diameter d3 of the drum shaft 55 at the low rotation speed is the same as the diameter d1 of the drum shaft 55, for example. . Also, from the low rotation speed to the middle rotation speed, since the required transmission torque at the time of spin-drying is smaller than that at the time of washing and the washing capacity is the same, the connection structure of the connection tool 70 and the connection receiving tool 72 needs to be changed. Absent. Therefore, the same thing is used for the connecting tool 70 and the connecting receiving tool 72 to form the rotor 61 (integrating the connecting tool 70),
And assembly of the drum shaft 55 (integration of the coupling holder 72)
do.

That is, in these cases, the drum shaft 5
What is necessary is just to use a thing with a different diameter for 5, and especially for this drum shaft 55, it is only necessary to use the same thing as the connection receiving member 72 and integrate it with the drum shaft 55.

On the other hand, when the rotation speed is high, the required transmission torque at the time of spin-drying is larger than that at the time of washing,
Since a larger transmission torque of the rotational power is required, the rotor 61 is formed by using a connector 70 having a flat surface 70a whose size is larger than that at the low rotation speed to the middle rotation speed. . Along with this, as for the connection receiving member 72, a flat surface 72a having a larger size than the case of the low rotation speed to the middle rotation speed is used, and is integrated with the drum shaft 55.

By doing so, it becomes possible to transmit the rotating power of the high-speed rotating type without any problem. In this case, the magnet 69 of the rotor 61 is also
Although the motor 60 is changed to one that generates a larger torque, a motor that generates a larger torque may be used in advance for the motor 60. Also, if the required transmission torque in this case is equivalent to the case of the large capacity specification described above,
The connection receiving member 72 may have a flat surface 72a of the same size.

As described above, according to the present configuration, the change of the rotational power transmission structure to the one having the different washing capacity and the dehydrating rotation speed is performed by the connecting portion of the rotor 61 and the drum shaft 55 which are separate parts. This can be dealt with by forming a rotor 61 and a drum shaft 55 by changing a certain connecting tool 70 and a connecting receiving tool 72, without affecting the accuracy of the motor 60 unlike the conventional cutting process. Easy to deal with.

The connecting member 70 is integrated with the rotor 61 by insert molding of plastic, whereby the connecting member 70 and the rotor 61 can be easily integrated. Further, the connection receiving member 72 is connected to the drum shaft 5.
5, so that the coupling receiver 72 can be easily integrated with the drum shaft 55.

The present invention is not limited to the embodiment described above and shown in the drawings.
0 may be an inner rotor type in which the rotor 61 is located inside the stator 62. In addition, the drum 43 may be supported obliquely, and the drying function may not necessarily be provided. For example, the drum 43 may be appropriately changed and implemented without departing from the gist.

[0042]

As described above, according to the drum-type washing machine of the present invention, in the case where the drum is directly driven to rotate by the motor, the connecting portion of the rotor is formed as a separate part or the connecting portion of the drum shaft is formed. By using a separate component, it is possible to easily change the rotation power transmission structure to one having a different washing capacity and a different spinning speed without affecting the accuracy of the motor.

In addition, if the connecting portion of the motor rotor is integrated with the rotor by insert molding of plastic, the connecting portion can be easily integrated with the rotor. Further, when the connecting portion of the drum shaft is pressed into the drum shaft to be integrated, the connecting portion can be easily integrated with the drum shaft.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing an embodiment of the present invention.

FIG. 2 is an overall cutaway side view.

FIG. 3 is a perspective view of a connecting member alone.

FIG. 4 is a perspective view of a single connection receiver.

FIG. 5 is an explanatory diagram of an operation (1).

FIG. 6 is a view for explaining an operation, part 2

FIG. 7 shows a conventional example and is equivalent to FIG.

FIG. 8 is a diagram corresponding to FIG. 2, showing a different conventional example.

[Explanation of symbols]

31 is an outer box, 36 is a water tank, 43 is a drum, 55 is a drum shaft, 60 is a motor, 61 is a rotor, 70 is a connecting member (rotor connecting portion), 70a is a flat surface, and 72 is a connecting receiving member (drum shaft). , 72a denotes a flat surface, and 73 denotes a connection receiving hole.

Claims (4)

[Claims] 1. A water tank elastically supported inside an outer box, a drum rotatably disposed inside the water tank, a drum shaft attached to the drum, and a back of the water tank. A motor connected directly to the drum shaft by a connecting portion of the rotor, and a motor for directly rotating the drum, wherein the connecting portion of the rotor is formed as a separate component. Type washing machine. 2. The drum type washing machine according to claim 1, wherein the connecting portion of the rotor is integrated with the rotor by insert molding of plastic. 3. A water tank elastically supported inside the outer box, a drum rotatably disposed inside the water tank, a drum shaft attached to the drum, and a back of the water tank. And a motor connected directly to the drum shaft by a connecting portion thereof, and a motor for directly rotating the drum, wherein the connecting portion of the drum shaft is formed as a separate component. Drum type washing machine. 4. The drum type washing machine according to claim 3, wherein the connecting portion of the drum shaft is press-fitted into the drum shaft to be integrated.