JPS5810088A - washing machine drive device - 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 rotational speed of the pulsator moderately low due to problems such as cloth staining, while when dehydrating, the rotational speed of the basket should be as high as possible to achieve powerful dehydration. Therefore, there must be a difference in the number of rotations between the two. In a normal fully automatic washing machine, the appropriate rotation speed of the sweater is around 300 rpm, taking into consideration the degree of cleaning and fabric damage.
If the diameter of the basket is around 380 mm and the rotation speed is around 800 to 950 rpm, the required 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 4A
(pole switching), (1) a structure with separate pulleys and belts for washing and dehydration, (2) a structure with a gear reduction means between the gear and pulsating shafts, etc.

■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 the cleaning is performed on the side with a larger number of poles and the dehydration is performed on the side with a smaller number of poles, it will be electrically disadvantageous. 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 slip.

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, noise complaints regarding 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 requires fewer components for reduction than a multi-stage gear reduction method. There was a strong desire to reduce costs by streamlining assembly, etc.

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 at the upper part of the outer frame l, a hanging rod 4 is arranged on the outer frame receiver 2 via a slider 3, and the lower end of the hanging rod 4 is arranged. A buffer tube 5 incorporating a vibration isolating spring (not shown) is provided and slides between the outer tank receiving portion 6 and elastically suspends the outer tank 7. 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.
A motor pulley 12 incorporating a cooling fan is attached to the motor shaft and connected to a pulley 14 via a belt 13.

As shown in FIG. 2, a pulley boss 16 is fixed to the pulley 14 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 21 and connected to a sun gear 22 through serrations formed at the tip of the shaft, and is further connected to a plurality of planetary gears 23 provided between the sun gear 22 and the internal gear 24. , is connected via the output gear 25 to a washing shaft 26 supported by a bearing 27 and connected to the 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 washator 28 by a mounting bolt 29.

The broken lower hollow dewatering shaft 30 is connected to the pulley boss 16 in only one direction via a clutch spring 17, and the clutch pawl 11 shown in FIG. 1 engages with the clutch boss 18. When the clutch spring 17 is idle, the clutch spring 17 rotates idly, and when the clutch claw 11 is disengaged from the clutch disk 18 by a pulp magnet (not shown) whose operation is controlled by a control switch (not shown), the clutch spring 17 is attached to the lower hollow dewatering shaft 30. It has a structure that transmits power. A brake wheel (combined as a gear case) 31 is fixed to a lower hollow dehydration shaft 30, and an internal gear 24 is fixed to this brake wheel 31 with a screw. Further, on the outer periphery of the brake wheel 31, a brake band (and liner) whose one end is pivotally supported (not shown) on the clutch case 9 is provided.
35, and during dehydration operation, the 7" L/- key band 35 is separated from the brake wheel 31 by the valve magnet. The gear case 32 is fixed to the brake wheel 31 with bolts 33, and the connecting part is O. ring 34
It has a watertight structure.

A clutch spring 36 that applies braking only in the opposite direction to the brake band 35 is provided at the upper part of the gear case 32. An upper hollow dewatering shaft 37 is fixed to the gear case 32, and has a watertight structure with a shaft knob 38.

Upper hollow dewatering shaft 37, ) 39 connects the basket 4]
It is fixed to the Franz support 40 at the bottom of the.

In FIG. 1, a balance ring 46 filled with a suitable liquid is provided at the upper edge of the basket 41. 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 1o at fixed intervals, for example, 26 seconds on and 4 seconds off, under the control of a timer. The rotational force of the motor 1o is transmitted to a pulley 14 via a pulley 12 and a belt 13, and the pulley is further transmitted to a pulley 14 via a pulley 12 and a belt 13.
It is transmitted to a gear input shaft 20, a sun gear 22, and a planetary gear 2.
3, and is transmitted to the pulsator 28 via the output gear 25 and the washing shaft 26. During this washing operation, when the laundry object comes into contact with the basket 41, the basket 41
In order to prevent the spindle from rotating together with the laundry, the rotation of the spindle is braked by a clutch spring 36 and a brake band 35. Next, during dewatering, the i-direction rotating force of the motor 1o is transmitted to the pulley 14 via the belt 13 and the pulley 14, which engages the clutch disk 18 under the control of the timer. In order to remove the claw 11 and the brake band,
The rotational force of the pulley 14 is transmitted to the basket 41 via the lower hollow dehydration shaft 30, the brake wheel 3, the gear case 32, and the upper hollow dehydration shaft 37, respectively.
1 rotates at high speed to perform dewatering operation. Busta during dehydration.

The number of rotations of the glue sweater 28 during washing
Regarding the relationship between the rotational speed, if the inner diameter of the basket is around 380 rpm, approximately 940 rpm is desirable due to the dehydration rate.
Additionally, it has been experimentally confirmed that the rotational speed of the gusseter is preferably about 320 rpm, and is set accordingly.

In the drive device of the planetary gear reduction method as described above, the present invention reduces parts cost by molding the brake wheel that accommodates the planetary gear device with resin, and also provides a screwdriver for the brake wheel to which the lower hollow dehydration shaft is fixed. The present invention provides a driving device for a washing machine in which a metal IT is fitted onto the outer periphery of the screw part to mechanically reinforce the screw part and to make the bearing part located below the screw part moisture-proof and dust-proof. Hereinafter, an embodiment 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 boss portion 51b is formed at the bottom of the brake wheel 51, and the lower hollow dehydration 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 formed into a polygonal or sawtooth shape, it will be firmly fixed to the boss part 51b and slipping will not occur. However, the screw 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 screw portion 51b and the screw portion 51b, a metal ring 53 is press-fitted onto the outer periphery of the screw portion 51b to prevent loosening of the joint due to dust accumulation. This metal ring 53 has a flange portion extending at the lower part, and this flange portion and 1,
A lubricant 54 such as grease is sealed between the lower hollow dewatering shaft 30 and the bearing 47, 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 a QIJ ring 34 is disposed at the joint part to form a watertight structure.

In this embodiment configured as described above, the brake wheel 51 is manufactured by resin molding, so the parts cost can be significantly reduced. Since the annular metal 52 is provided on the outer periphery of the part, 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 υ bearing 47 drip-proof, moisture-proof, Bearing 4 has a dustproof function.
This has the effect of extending the life of the 7.

In addition, on the outer periphery of the hollow cylindrical body of the brake wheel 51,
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, the connection with the lower hollow dehydration shaft is ensured, and reliability is increased, and the brake wheel is molded with resin. It has drip-proof, moisture-proof, and dust-proof effects, so it has the advantage of improving durability.

[Brief explanation of the drawing]

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. lO...Motor, 17...Spring clutch, gear, 26...Washing shaft, 28...Pulsator, 30...
・Lower hollow dehydration shaft, 32... Gear case, 35...
Brake band (and liner), 37... Upper hollow dehydration shaft, 41... le/dehydration tank (basket), 51...
・Brake wheel, 51b... screw 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, the planetary gear device being housed between the lower hollow dehydrating shaft and the upper hollow dehydrating shaft connected to the washing and dehydrating tank through which the washing shaft is inserted; In the washing machine equipped with a gas case, the brake wheel is made of a resin molded product, and has a cylindrical death part to which the lower hollow dehydration shaft is fixed at the lower part thereof, and a metal ring is fitted to the outer periphery of the boss part. Characteristic washing machine drive device.