JPS5810089A - Drive apparatus of washing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a drive device in a fully automatic washing machine.

In fully automatic washing machines, washing is carried out by stirring water by the rotation of a pulsator placed at the bottom of a washing and dehydrating tank (hereinafter referred to as the basket), which has many small holes in the wall, and dehydration is carried out by the high speed rotation of the basket. This is done using centrifugation. When washing, it is necessary to keep the rotation speed of the gurusetter at a moderately low level due to problems such as cloth stains, etc. When dehydrating, on the other hand, by increasing the rotation speed of the basket as high as possible, strong dehydration can be achieved. Since it is possible to do so, it is necessary to make a difference between the rotation speeds of the two. In a normal fully automatic washing machine, the appropriate rotational speed of the nosolcator is around 300 rpm, taking into account the cleanliness and fabric damage. At about 800 to 95 Orpm, the necessary dehydration effect can be obtained.

In order to obtain these two rotational speeds, low speed and high speed,
Motor pole number conversion method (e.g. 2/4 pole or 4/4 pole)
(8-pole switching), ■ A structure with separate pulleys and belts for washing and dewatering, and ■ A structure with a gear reduction means between the pulley and the pulsator shaft.

■In the case of changing the number of poles of the motor, the motor has two
As with the case where a separate motor is used, it becomes large and difficult to support due to its weight when attached to a washing machine, and the attachment part needs to be strong. Furthermore, if washing is performed on the side with a larger number of poles and dehydration is performed on the side with a smaller number of poles, it is electrically disadvantageous as well. Next, in the case of two belts (2), the desired tension cannot be obtained unless the center distance between each pulley is constant, which may cause belt slitting. Furthermore, separate pulleys and belts are used for washing and dewatering, making mechanical switching difficult. In the case of multi-stage gear reduction, mechanical noise is unavoidable due to the precision of mechanical parts and errors in combination, and as a countermeasure, measures such as sealing oil in the gear case were taken. .

However, in recent years, complaints about noise caused by home appliances have become even stronger, and a planetary gear reduction method has been adopted as a means of low-noise gear reduction, but this method has a lower speed reduction than a multi-stage gear reduction method. There was a strong desire to reduce the number of components.

First, the configuration and operation of a conventional fully automatic washing machine using a planetary gear reduction method will be explained with reference to FIGS. 1 and 2. In FIG. 1, a plurality of outer frame receivers 2 are provided on the upper part of the outer frame l, and a slider 3 is mounted on the wide outer frame receiver 2.
A suspension rod 4 is disposed through the suspension rod 4, and a buffer tube 5 with a built-in anti-vibration spring (not shown) is provided at the lower end of the suspension rod 4. The outer tank 7 is suspended elastically. A base plate 8 is fixed to the bottom of the outer tank 7, and a clutch case 9 is fixed to the base plate 8 so as to be watertight to the outer tank 7. The board 8 also has a drive motor 1.
0 is fixed with bolts, and a motor pulley 12 incorporating a cooling fan is attached to the motor shaft, which is connected to the pulley 14 through a valve 3.

! As shown in FIG. 2, the pulley boss 16 is fixed to -914 by a bolt 15, and the pulley boss 16 is fixed to the gear input shaft 2o by a pin 19. The gear input shaft 20 is supported by a bearing 2 and connected to a sun gear 22 through serrations formed at the tip of the shaft. It is connected via the planetary gear 23 and the output gear 25 to a washing shaft 26 supported by a bearing 27 and connected to the υ output gear 25 by serrations formed at the lower part.

The washing shaft 26 is made watertight by a shaft seal (not shown) and is fixed to the /# lucator 28 by a mounting bolt 29.

In addition, the lower hollow dehydration shaft 30 is connected to the clutch spring 17.
When the clutch claw 11 shown in FIG. 1 is engaged with the clutch disk 18, the clutch spring 17 idles and the control switch ( i
When the shift latch claw 1 is disengaged from the clutch boss 18 by a pulp magnet (not shown) that is controlled by e-operation,
The structure is such that power is transmitted to the lower hollow dehydration shaft 30. A brake wheel (also a gear case) 31 is fixed to a lower hollow dehydration shaft 30, and this brake wheel 3
An internal gear 24 is fixed to the hole by a bolt. In addition, a clutch case 9 is attached to the outer periphery of the brake wheel 3.
The brake band (and liner) 35, whose one end is pivotally supported (not shown), is detached from the brake wheel 3 by the valve magnet during dewatering operation. The gear case 32 is fixed to the brake wheel 31 with bolts 33, and the connecting part is an O-ring 3.
4, it has a watertight structure. A despring 36 is provided at the upper part of the gear case 32 to apply braking only in the direction opposite to the brake band 35. gear case 3
An upper hollow dewatering shaft 37 is fixed to the shaft 2, and a shaft seal 38 provides a watertight structure. Upper hollow dehydration shaft 37
Lotus.

It is fixed to a Franz support 40 at the bottom of the basket 4 by a bolt 39.

In FIG. 1, a balance ring 46 filled with a suitable liquid is provided at the upper edge of the basket 4. A housing section 42 for controlling switches and the like is integrally molded with a top plate section 43. 44 is a lid covering the laundry input opening, 45
are legs fixed to the outer frame 1.

In the conventional example configured as described above, washing is performed by automatically reversing the motor 10 at fixed intervals, for example, 26 seconds on and 4 seconds off, under the control of a timer. The rotational force of the motor 100 is transmitted to the pulley 14 via the pulley 12 and belt 13, and is further transmitted to the pulley boss 16,
It is transmitted to a gear input shaft 20, a sun gear 22, and a planetary gear 2.
3, and is transmitted to the spool sweater 28 via the output gear 25 and the washing shaft 26. During this washing operation, when the laundry item comes into contact with the basket 41, the Shibastat 4
In order to prevent the spindle from rotating together with the laundry, the rotation of the dewatering shaft is braked by a clutch spring 36 and a brake band 35. Next, during dehydration, the unidirectional rotational force of the motor 10 is transmitted to the pulley 14 via f-I)1z and the belt 13, but at this time, the clutch disk 18 is engaged under the control of a timer. Tackle 11 and brake band 35
Since the braking caused by is removed by a valve magnet,
The rotational force of the pulley 14 is transmitted to the basket 4 via the lower hollow dehydration shaft 30, the brake wheel 3, the gear case 32, and the upper hollow dehydration shaft 37, respectively.
The spindle rotates at high speed to perform the dewatering operation. Pasta during dehydration.

The number of rotations of the sweater 41 and the sweater 28 during washing
Regarding the relationship between the rotation speed, if the inner diameter of the basket is around 380 rpm, it is desirable to have around 940 rpm due to the dehydration rate.
Furthermore, it has been experimentally confirmed that it is desirable that the rotational speed of the pulsator is about 32'Orpm, and is set accordingly.

The present invention aims to reduce parts costs by molding the brake wheel housing the planetary gear device out of resin in the above-mentioned planetary gear reduction type drive device, and to reduce parts costs by molding the brake wheel housing the planetary gear device out of resin. The present invention provides a driving device for a washing machine in which a ring-shaped metal is fixed to improve the abrasion resistance of a sliding part with a brake band. Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, and the same reference numerals as in FIG. 2 indicate the same elements. Reference numeral 51 denotes a resin-molded brake wheel, and an internal gear 24 that meshes with the planetary gear 23 is fitted inside the hollow cylindrical body that houses the planetary gear device, and a pin 51a that passes through the internal gear 24. The upper part is welded and fixed. A ring-shaped metal 52 whose lower part is bent inward is fixed to the outer periphery of the hollow cylindrical body by a method such as press-fitting or insert molding. A brake band (and liner) 35 is arranged opposite to this ring-shaped metal 52.

A lower boss portion 51b of the brake wheel 5 is formed, and the lower hollow dewatering shaft 30 is fixed thereto by a method such as press-fitting or insert molding. This lower hollow dehydration shaft 30
If the press-fitting part is made into a polygonal or sawtooth shape, it will be firmly fixed to the dead part 51b and syslip etc. will not occur. However, the death part 51b made of resin and the lower hollow dehydration shaft 3 made of metal
Since there is a difference in coefficient of thermal expansion between the two and 0, a metal ring 53 is press-fitted and fixed to the outer periphery of the dead part 51b in order to prevent the joint from loosening due to temperature. This metal ring 53 has a flange portion extending from the bottom thereof, and this flange portion,
A lubricant 54 such as grease is sealed between the bearing 47 that supports the lower hollow dewatering shaft 30, and in combination with the flange portion, the bearing 47 has drip-proof, moisture-proof, and dust-proof functions. .

The upper edge of the hollow cylindrical body of the brake wheel 51 is connected to the gear case 32 to which the upper hollow dehydration shaft 37 is press-fitted and the bolt 3.
3, and an O-ring 34 is attached to the joint.
is installed to create a watertight structure.

In this embodiment configured as described above, the brake wheel 5 is manufactured by resin molding, so the parts cost can be significantly reduced, and the brake band 35 contacts and slides during dehydration braking. Since the ring-shaped metal 52 is disposed around the outer periphery of the hollow cylindrical body, there is no problem in durability. Also,
The fixation with the lower hollow dehydration shaft 30 is reliable, and loosening of the joint due to temperature changes can be prevented.Furthermore, the combination of the flange part of the metal ring 53 and the lubricant 540 makes the bearing 47 drip-proof and moisture-proof. Since it has a dustproof function, it has the effect of extending the life of the bearing 47.

In addition, on the outer periphery of the hollow cylindrical body of brake wheel 5,
By forming a plurality of grooves 55 as shown in FIG. 4, the frictional heat generated in the annular metal 52 during dehydration braking can be easily dissipated.

As explained above, according to the present invention, by molding the brake wheel with resin, parts costs can be reduced, and durability can be improved by preventing wear of the brake wheel due to the brake band during dehydration braking. It has practical effects such as being able to do things like a dog.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a fully automatic washing machine, Fig. 2 is a detailed sectional view of a conventional drive device, Fig. 3 is a sectional view of essential parts of an embodiment of the present invention, and Fig. 4 is a brake It is a partial perspective view of a wheel. No0...Motor, 17...Spring clutch, 2
0... Gear input shaft, 22... Sun gear, 23...
Planetary lower hollow dehydration shaft, 32... Gear case, 35...
・Brake band (and liner), 37... Upper hollow dehydration shaft, 4... Washing and dehydration tank (basket), 5...
...Brake wheel, 51b...Boss part, 52...
- Ring-shaped metal, 53... Metal ring, 55... Groove. Figure 1 Figure 2

Claims (1)

[Claims] A speed reduction device consisting of a planetary gear device is provided between a gear input shaft connected to the motor and a washing shaft connected to the stirring blade, and the gear input shaft is passed through the inside and connected to the gear input shaft via a clutch means. A brake wheel and a gear case are provided in which the planetary gear device is housed between a lower hollow dehydration shaft which is connected to a washing and dehydration tank through which the washing shaft is inserted, and an upper hollow dehydration shaft which is connected to a washing and dehydration tank, and which has a brake means for dehydration braking. In the washing machine, the brake wheel is made of a resin molded product, and a ring-shaped metal is fixed to the outer periphery of the hollow cylindrical body of the brake wheel, on which the brake means abuts and slides during dehydration braking. Washing machine drive unit.