JP4413656B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum type washing machine having an improved driving device.

  Conventionally, in a drum type washing machine, as shown in FIG. 9, a water tub 2 is elastically supported by a plurality of sets of suspensions 3 in an outer box 1, and a rotating tub 4 is provided in the water tub 2. The horizontal axis is arranged so as to be rotatable. The rotating tub shaft 5 to which the rotating tub 4 is attached is supported by bearings 7 and 8 held by a bearing housing 6 attached to the water tub 2, and is attached to the end of the rotating tub shaft 5 on the side opposite to the rotating tub 4. A driven pulley 9 is attached.

On the other hand, a motor support 10 is attached to the outer bottom surface of the water tank 2, and a motor 11 is attached to the motor support 10. A driving pulley 13 is attached to the rotating shaft 12 of the motor 11, and a belt 14 is stretched between the driving pulley 13 and the driven pulley 9.
With this structure, the rotational driving force of the motor 11 is transmitted from the rotating shaft 12 to the driving pulley 13, the belt 14, and the driven pulley 9 in this order, and the rotating tank shaft 5 is rotated with the rotating tank 4. The laundry is washed, dehydrated, and dried.

  In the case of the above, parts of the driving pulley 13, the belt 14, and the driven pulley 9 are necessary to transmit the rotational driving force of the motor 11 to the rotating tub shaft 5 and the rotating tub 4, and the cost is high. It was. Moreover, the assembly of each one was troublesome. Moreover, the drive pulley 13, the belt 14, and the driven pulley 9 generate vibrations individually, and by combining them, not a few operating vibrations are generated. Furthermore, 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 during high-speed rotation. Noise was generated.

  In addition, the motor 11 attached to the outer bottom surface of the water tank 2 is difficult to perform maintenance such as inspection and repair or replacement. The motor 11 attached to the outer bottom surface of the water tank 2 is used when the washing machine is installed on the waterproof pan and the drain of the waterproof pan is clogged and the drainage water level increases. Therefore, there is a risk of flooding or dripping with water, and countermeasures such as an abnormal water level detection device or an electrical safety device are necessary for that purpose, and the cost is further increased.

  Furthermore, in recent years, a detecting means for detecting the rotation of the rotating tub 4 is provided, whereby the amount of laundry cloth, the amount of dry cloth, or the amount of unbalance can be detected. It is greatly affected by tension and slip. That is, if the tension of the belt 14 is not as expected or the belt 14 seems to slip, the detecting means cannot accurately detect the rotation of the rotating tub 4, and as a result, The amount of dry cloth or the amount of unbalance cannot be accurately detected, and the detection accuracy is lowered. For this reason, it is necessary to strictly control the tension and dimensions of the belt 14, and the manufacturability has deteriorated.

  The present invention has been made in view of the above circumstances, and therefore the object thereof is to simplify the drive device and increase the position thereof, thereby reducing the cost, facilitating assembly, vibration and noise. It is an object of the present invention to provide a drum-type washing machine that can improve the maintenance, improve the maintainability, and improve the manufacturability, and can suppress the increase in the overall depth.

In order to achieve the above object, the drum type washing machine of the present invention is provided with a water tank elastically supported inside the outer box, and inside the water tank so that the axial direction is front and back and the horizontal axis is rotatable. A drum-shaped rotating tank, a rotating tank shaft that is detachably attached to the rear side of the rotating tank, and has a counter-rotating tank side end projecting from the water tank, and a bearing that supports the rotating tank shaft are held. And a bearing housing that is detachably provided on the rear side of the water tank, and includes an outer rotor type brushless motor as a rotational drive source of the rotary tank, and the outer rotor type brushless motor is connected to the rotor magnet. A rotor detachably attached to the end of the rotating tub shaft on the side opposite to the rotating tub, and detachably attached to the water tub so as to be located inside the rotor and on the outer periphery of the bearing housing And detecting means comprising a Hall IC that detects rotation of the rotating tank accompanying rotation of the rotor by detecting each pole of the rotor magnet, and mounted on a circuit board that also serves as a mounting plate. as the state, as before Symbol detecting means is a magnet opposite to the position of the rotor, the circuit board mounted with said detection means, attached to the stator of the outer rotor type brushless motor, the said stator characterized in that attached by a bolt to the housings.

  According to the above configuration, the motor is directly connected to the rotating tub shaft, and the rotating tub is rotationally driven by this direct connection structure. Therefore, the conventional driving pulley, belt, and driven pulley are not required. In this case, the motor is arranged at the center of the rear wall of the water tank, and there is no risk of flooding. Further, since an outer rotor type motor that is flat in the axial direction is used and the inner space of the stator of the motor is used for the arrangement of the bearings, an increase in the overall depth dimension can be suppressed. Furthermore, since the means for detecting the rotation of the rotating tub is attached to the stator of the motor, the rotation of the rotating tub can be detected efficiently via the motor, and the installation itself can effectively use the motor space, and the wiring Etc. can be efficiently performed together with the motor wiring.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, FIG. 1 shows an outer box 21 of the entire drum type washing machine, which has a laundry entrance 22 at the center of the front and a work opening 23 at the center of the rear. Yes. Among them, a door 24 is provided at the laundry entrance 22 so as to be openable and closable, and a back plate 25 is provided at the work opening 23 so as to be detachable.

  Inside the outer box 21, a water tank 26 is elastically supported by a support plate 27 and a plurality of sets, for example, four sets (only two sets are shown) of suspensions 28. The water tank 26 has a drum shape, and is disposed in the outer box 21 in a horizontal axis shape whose axial direction is front and rear. The water tank 26 has a connection port 29 at the center of the front end plate portion, and this is connected to the laundry entrance 22 of the outer box 21 by a bellow 30.

On the other hand, a drain port (not shown) is formed at the bottom of the water tank 26, a drain valve 31 is connected to the drain port, and a drain hose 32 is connected to the drain valve 31.
A rotating tank 33 is disposed inside the water tank 26. This rotating tub 33 has a drum shape smaller than the water tub 26, functions as a washing tub, functions as a dewatering tub, and further functions as a drying drum. Like the water tank 26, it is arranged in a horizontal axis shape in which the axial direction is front and rear, and is arranged so that the horizontal axis can rotate. In addition, a hole 34 that is used for water passage and for ventilation is formed in the body of the rotary tank 33 over the entire area.

  Here, FIG. 2 shows the drive device portion of the rotating tub 33 in detail. As apparent from FIG. 2, for example, a rear end plate portion which is a rear wall of the plastic water tank 26 is attached with a metal reinforcing plate 35 such as stainless steel, and a plurality of bolts 36 (only a part of which is shown). It is stuck by. Also, for example, a rear end plate portion, which is also the rear wall of a metal rotating tub 33 such as stainless steel, is provided with a plurality of rotating tub supports 37 that also serve as a reinforcing plate made of metal having a larger thickness (FIG. 1). Only one bolt is shown).

Housing insertion holes 39 and 40 are formed in the central part of the rear end plate part of the water tank 26 and the central part of the reinforcing plate 35, respectively, and a cylindrical bearing housing 41 is inserted into these from the rear. In addition, a mounting portion 41a projecting outward of the bearing housing 41 is fixed to the reinforcing plate 35 by a plurality of bolts (only one is shown).
On the other hand, the rotary tank shaft 43 is fixed to the center of the rear end plate portion of the rotary tank 33 by a plurality of bolts 44 (only one is shown) with the central part of the rotary tank support 37 interposed therebetween. Further, a cap 45 that covers each head of the bolt 44 is attached to the rotary tank shaft 43 by screws 46 with the center portion of the rear end plate portion of the rotary tank 33 interposed therebetween.

  With this structure, a ball bearing 47 as a bearing is press-fitted from the rear in the front part of the bearing housing 41, and the rotary tank shaft 43 is inserted from the front inside the ball bearing 47. An outer collar 48 and an inner collar 49 are inserted into the bearing housing 41 (between the outer peripheral surface of the rotary tank shaft 43) from the rear, and a ball bearing 50 that is a bearing is further press-fitted into the ball bearing 47. , 50 are held by the bearing housing 41, and the rotary tank shaft 43 is rotatably supported by the held ball bearings 47, 50.

In addition, a seal 51 is provided in advance between the housing insertion hole 39 of the water tank 26 and the bearing housing 41 so as to seal the space between the housing insertion hole 39 and the bearing housing 41 in a watertight manner.
Now, the bearing housing 41 is attached as described above, and the motor 52 is attached from the water tank 26 side supporting the rotary tank shaft 43 to the rotary tank shaft 43. The motor 52 is an outer rotor type brushless motor in which the rotor 53 is positioned outside the stator 54 and rotates. As shown in FIG. 3, the stator 54 includes a laminated iron core 55 and a bobbin 56. And a winding 57 installed therethrough. The stator 54, especially the laminated iron core 55, is attached to the attachment portion 41 a of the bearing housing 41 by a plurality of bolts 58 (only one is shown).

The stator 54 may be attached to the reinforcing plate 35 or the water tank 26, and the reinforcing plate 35, the water tank 26, and the bearing housing 41 are on the water tank 26 side. Therefore, the stator 54 is attached to the water tank 26 side.
The ball bearing 50 on the side opposite to the water tank 26, which is a part of the ball bearings 47 and 50 that support the rotating tank shaft 43, is located inside the stator 54 with the stator 54 attached.

  On the other hand, the rotor 53 includes a rotor housing 59, a yoke 60 fixed to the outer surface of the peripheral portion of the rotor housing 59, and a magnet 61 fixed to the inner surface of the peripheral portion of the rotor housing 59 in one pole and one arrangement. And the center of the rotor housing 59 is fitted to the end of the rotary tank shaft 43 on the side opposite to the rotary tank 33, and is attached so as to rotate integrally by engagement by serration or the like and tightening by the nut 62. Yes.

In this attached state, the rotating tub shaft 43 also serves as the rotor shaft of the motor 52. Accordingly, in this case, the rotating tub shaft 43 also serves as the rotor shaft of the motor 52.
Further, a rotation sensor 63 is attached to the laminated iron core 55 of the stator 54 of the motor 52 as detection means for detecting the rotation of the rotating tub 33. Specifically, the rotation sensor 63 is made of, for example, a Hall IC, and is mounted via the circuit board 64 in a state of being mounted on the circuit board 64 that also serves as a mounting plate. 63 opposes the magnet 61 of the rotor 53, and by detecting each pole of the magnet 61, the rotation of the rotor 53, and hence the rotation of the rotating tank 33, is detected.

  The washing machine of this embodiment detects the amount of laundry, the amount of dry cloth, or the amount of unbalance based on the detection result of the rotation sensor 63, and the operation based on the detection and the detection result. A control device 65 (see FIG. 1) for controlling is mounted on the front upper portion of the outer box 1. In addition, the washing machine of the present embodiment not only performs washing and dehydration of the laundry, but also dries. Although not shown, for example, a blower, a dehumidifier, a heater, etc. for the drying are included. It has dry functional parts.

Next, the operation of the above configuration will be described.
When washing, dehydrating or drying the laundry, the motor 52 rotates the rotor 53 by energizing the winding 57, and the rotation of the rotor 53 is directly transmitted from the rotary tank shaft 43 to the rotary tank 33. Is done.
As described above, in this configuration, the motor 52 is directly connected to the rotary tank shaft 43, and the rotary tank 33 is rotationally driven by this direct connection structure. A drive pulley, a belt, and a driven pulley like the conventional one are required. And not. Therefore, the number of parts used can be reduced correspondingly, and the drive device can be simplified, and the cost can be reduced. Further, the assembly of the drive pulley, the belt and the driven pulley is unnecessary, and the assembly can be facilitated. At the same time, there is no occurrence of individual vibrations due to these conventional driving pulleys, belts, and driven pulleys, and furthermore, no vibrations due to belt slips during high-speed rotation. Noise reduction can be achieved.

  In addition, in the case of this configuration, the drive device as a whole can be provided at the center of the back of the water tank 26, and the position of the motor 11 is made higher than that of the conventional motor 11 attached to the outer bottom surface of the water tank 2. Thus, maintenance such as inspection and repair or replacement can be facilitated. In particular, in the case of this configuration, there is a back plate 25 at the back of the center of the back of the water tank 26, and the work can be performed from the clear work port 23 by removing this, so that the maintainability is further improved. Can do.

  Further, as described above, the position of the drive device as a whole can be increased, so that in the situation where the washing machine is installed on the waterproof pan, the drain port of the waterproof pan is clogged and the water level of the drainage is reduced. The motor 52 will not be submerged or splashed even when it is increased, and measures such as an abnormal water level detection device or an electrical safety device for the submergence etc. can be made necessary, further reducing the cost. Can be achieved.

Further, regarding the rotation detection structure of the rotating tub 33 by the rotation sensor 63, since there is no belt like the conventional one in the driving device, the rotation of the rotating tub 33 is not affected by the degree of tension or slip of the belt. It is possible to improve the manufacturability without the need for strict belt tension management and dimensional management.
And since the motor 52 is an outer rotor type | mold, it is flat in an axial direction and the increase in the whole depth can be suppressed by that much. In FIG. 4, a conventional inner rotor type (rotor is located on the inner side of the stator) 11 is attached to the center of the rear wall of the water tank 2, and the rotary shaft 12 is connected to the rotary tank shaft 5. In this example, as apparent from the large bulging dimension L1 of the back plate 15 by the motor 11, an increase in the entire depth cannot be suppressed. On the other hand, in this configuration, as is apparent from the small bulging dimension L2 of the back plate 25, an increase in the overall depth can be suppressed, and a large space is required for installation. It can be done without.

In addition, the following effects can be obtained particularly in the present configuration.
By making the rotary tank shaft 43 also serve as the rotor shaft of the motor 52, it is possible to further reduce the number of parts used and to achieve a further reduction in cost compared to those that require them separately. Also, in this case, since it is possible to save the time and effort of assembling the individual shafts, further ease of assembly can be achieved, and further, the shaft is not connected in the entire depth direction. The increase in the overall depth can be further suppressed.

The ball bearing 50 on the side of the anti-water tank 26, which is a part of the ball bearings 47 and 50 that support the rotary tank shaft 43, is disposed inside the stator 54 of the motor 52, so that the space inside the stator 54 is reduced to the ball. It can utilize for arrangement | positioning of the bearing 50 and can further suppress the increase in the whole depth.
By attaching a rotation sensor 63, which is a detecting means for detecting the rotation of the rotating tub 33, to the stator 54 of the motor 52, the rotation of the rotating tub 33 can be efficiently detected via the motor 52, and the installation itself, the motor The space 52 can be used effectively, and wiring and the like can be efficiently performed together with the wiring of the motor 52.

On the other hand, FIG. 5 shows a second embodiment of the present invention, and only differences from the first embodiment will be described below.
In this case, a mounting plate 71 separate from the reinforcing plate 35 of the water tank 26 is provided, and a bearing housing 41 is mounted on the mounting plate 71 with screws 42, and thereafter, the rotary tank shaft 43, The ball bearings 47 and 50 are assembled, and the motor 52 is mounted from the bearing housing 41 to the rotary tank shaft 43 to assemble these units.

  In this way, with the bearing housing 41, the rotary tank shaft 43, the ball bearings 47, 50, and the motor 52 assembled in advance as a unit, bolts (not shown) that pass through the mounting holes 72 of the mounting plate 71, etc. Thus, it can be attached to the water tank 26, and further ease of assembly can be achieved. Moreover, even when it is necessary to remove such as during inspection and repair, they can be removed together, and the necessary work can be performed in a wide area outside the machine.

FIG. 6 shows a third embodiment of the present invention, and only the points different from the first embodiment will be described below.
In this case, a plurality of (only one is shown) bosses 83 are formed on the rear wall 81 made of, for example, plastic of the water tank 26 together with a large number of reinforcing ribs 82, and the bearing housing 41 is attached to the bosses 83 with bolts 42. The bearing housing 41 is directly attached to the rear wall 81 of the water tank 26. By doing in this way, it becomes unnecessary to attach the reinforcing plate 35 to the water tank 26, and the assembly can be further facilitated.

FIG. 7 shows a fourth embodiment of the present invention. Only the points different from the first embodiment will be described below.
In this case, a bearing housing that holds a reinforcing plate 91 that reinforces the rear wall of the water tank 26 in place of the reinforcing plate 35 and a ball bearing 47 and 50 that supports the rotating tank shaft 43 in place of the bearing housing 41. 92 are integrally formed by, for example, die casting.

By doing so, the work of attaching the bearing housing 92 to the reinforcing plate 91 can be made unnecessary, and the assembly can be further facilitated.
FIG. 8 shows a fifth embodiment of the present invention. The rear wall 101 of the water tank 26 and a bearing housing 102 for holding ball bearings 47 and 50 for supporting the rotary tank shaft 43 in place of the bearing housing 41 described above. Are integrally formed, for example, by die casting.

  By doing so, it is possible to eliminate the need to attach the reinforcing plate 35 to the water tank 26 and to eliminate the need to install the bearing housing 92 to the rear wall 101 of the water tank 26, making it easier to assemble. Can be achieved.

FIG. 1 is an overall cutaway side view showing a first embodiment of the present invention. Enlarged longitudinal side view of the main part Exploded perspective view of motor alone FIG. 1 equivalent diagram showing a comparative example FIG. 2 is a partial equivalent diagram showing the second embodiment of the present invention. FIG. 2 equivalent view showing a third embodiment of the present invention. FIG. 2 equivalent diagram showing a fourth embodiment of the present invention. FIG. 2 equivalent diagram showing a fifth embodiment of the present invention. 1 equivalent diagram showing a conventional example

Explanation of symbols

In the drawings, 21 is an outer box, 26 is a water tank, 28 is a suspension, 33 is a rotation tank, 41 is a bearing housing, 43 is a rotation tank shaft, 47 and 50 are ball bearings (bearings), 52 is a motor, 53 is a rotor, Reference numeral 54 denotes a stator, 63 denotes a rotation sensor (detection means), 71 denotes a mounting plate, 81 denotes a rear wall of the water tank, 91 denotes a reinforcing plate, 92 denotes a bearing housing, 101 denotes a rear wall of the water tank, and 102 denotes a bearing housing.

Claims (1)

A water tank that is elastically supported inside the outer box, a drum-shaped rotary tank that is axially back and forth inside the water tank and that can be rotated on the horizontal axis, and a rear side of the rotary tank A rotating housing shaft that is detachably attached and has an end opposite to the rotating tank protruding from the water tank and a bearing that supports the rotating tank shaft, and a bearing housing that is detachably provided on the rear side of the water tank. In what
An outer rotor type brushless motor as a rotational drive source of the rotating tub, the outer rotor type brushless motor having a rotor magnet and detachably attached to an end of the rotating tub shaft on the side opposite to the rotating tub; And a stator that is detachably attached to the water tank so as to be located inside the rotor and on the outer periphery of the bearing housing, and detecting each pole of the rotor by detecting each pole of the magnet of the rotor the detection means comprising a Hall IC for detecting the rotation of the rotating tub in accordance with the rotation in a state of being mounted on a circuit board which also serves as a mounting plate, as before Symbol detection means is a position facing the magnet of the rotor, the sensing said circuit board means to implement, attached to the stator of the outer rotor type brushless motor, the said stator Haujin Drum type washing machine, characterized in that attached by bolts.

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