DE2009898A1 - Drum washing machine - Google Patents

Description

Drum washing machine. "* '

The invention relates to a drum washing machine, in particular a washing machine, with one in relation to the axis of rotation, horizontally arranged washing drum and with a drive motor, which can be switched to two different speeds and a downstream V-belt adjustment gear to drive the drum, adjustable by changing the speed of the drive motor is.

In drum / air conditioning machines of the type mentioned above, there is a requirement to design the drive in such a way that two speeds for spinning and washing that are far apart can be set. If you want to achieve a good drying effect of the laundry during the spinning process - a residual moisture content of approx. 50 % is aimed for - the spin speed must be selected as high as possible, since the centrifugal force expelling the moisture increases with the square of the angular velocity. On the other hand, the washing speed must be measured in such a way that the centrifugal force occurring on the drum circumference reaches approximately 0.9 g so that the laundry is lifted out of the detergent solution with each drum cycle, but before reaching the highest point of the circumference again in "the With the usual drum dimensions, this requirement leads to a washing speed of around 50 rpm.

For maintenance and cost reasons, the aim is to to use squirrel cage motors for the drive, which, however, are not very suitable because of their poor start-up behavior. at Use of pole-changing motors must be used to achieve the above Speed ratio a very high number of poles ratio » z. B. 2:24 or higher, can be used, 'Then also

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109836/0809

YPA 70/9201

these engines are relatively heavy and expensive. There too, after all

purely mechanical solutions, for example a drive motor with a downstream two- or ^ ehi-stage gearbox, are very complex, a combination has proven to be suitable, which consists of a, pole-independent motor r.; it relatively small number of poles ratio and a connected V-belt adjustment gear consists.

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With this drive, the problem arises that the Achn-ibrrtand of the driven and the driven wheel of the motor or res Kcilriemoiigetriebes must be arranged. A number of solutions have become known for this. Zo is z. B. the drive motor according to the Austrian patent 233 126 is designed to be height-adjustable for this purpose by means of a control lever. However, this solution is quite complex, since the said weight dos Hotors has to be raised or lowered and there is also a considerable amount of rough ::! is claimed.

According to another solution (German Oi.feiileguri.v -.- script 1 485 074), d - ;; r required: u.? -iUsg'Loich of Ac: iG £ .b: -i-: rides vavz means Giner divisible Ric-D'jnsuhoibo which changes the path of the Eeilrierriens. Pel diesel 'slogan -, /.!. rd the V-belt ::; More often than not, so you have to accept greatly increased wear and tear on the V-belt.

With another solution (German Offsnlegmigsschri.it 1 460 890) the life engine is on .-, oi.'i -.- r ■■■ · ■ wirvl> solution by the invention aufgegr-i .. :: .η that it äbzid-i *..!. to improve the vorer -.- mhnte solution Za this Zwe: k the invention proposes that {:;! ·:> ileilriemenverste ^ llgetriebe in just eim a known './eiso ni t: lieilriemensciieibe v verstellfiarsn of perils set and drove r.er to:> ao "t re for Change of the Achsabst-ftnae · :; irorürael — Iot or le diglich χα common center of gravity of all oscillating parts is hinged.

In this way it is achieved that the movement is carried out by the motor the suspension in the center of gravity is kept as small as possible,

983Ö / 08Ü9

VPA 70/9201.

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so that the already very small space is not taken up much by the movement of the motor. Further, the "will not be transferred from the Hotor outgoing mass forces on the V-belt at each oscillation auif this way is thereby λ '- that ^erhindert;. Not the belt tension changes do not adversely with the unavoidable significant oscillations in the spin operation by the mass forces of the Hotors v. / can ground.

In the embodiment of the invention, an arrangement is recommended in which the drive motor, which is pivotably mounted in the common center of gravity of all pivotable parts, is connected to the V-belt adjustment gear ^{via a long 1 junction.} In addition, a projection will be provided on the housing of the drive motor on the drive shaft side, which can serve as an abutment for a spring which brings about the V-belt tension for the motor. Finally, you can connect a switch to the top of the housing, which can be adjusted so that it is operated in a certain Kotorposition. Such a switch can be used to switch the drive motor on and off alternately, so that an intermediate speed can be set in this way.

An exemplary embodiment of the invention is shown schematically in the drawing shown. '

The washing and spinning unit, which is resiliently suspended from the machine housing 11 ä by means of springs 12, consists of a drum-shaped tub 14, the washing and spinning drum 15 mounted overhung therein and the drive device for the washing and spinning drum. This is formed by a pole-changing Hotor 21 (e.g. 2: 12 pole) and a connected V-belt adjustment gear 22, the adjustable V-belt pulley 24 of which is directly connected to the actual gear body 23. -

To the V-belt 26, which is on the Trorraelseite with a non-variable diameter flat belt pulley 13 as: drive pulley working together, always keeping the same tension,. ·

1098 36/08 09

VPA 70/9201

the drive motor 21 is pivotably connected to the tub 14. For this purpose there is a U-shaped on the tub Mounted carrier 30, in which the drive motor 21 is mounted in the common center of gravity S of all pivotable parts 21, 22 and 25 is.

Since the motor shaft does not move parallel to the drum shaft while the gear is being adjusted, but rather opposite it is pivoted, the V-belt adjustment mechanism 22 is made as small as possible in diameter, so that the V-belt 26 cooperating flanks of the V-belt pulley 24 do not experience too great changes in position. In addition, the The disadvantage of the one-sided pivotability can be greatly reduced in that a Kotor shaft 25 that is as long as possible is used, the a large distance of the drive motor 21 from the adjustment gear 22 allows.

On the housing of the / 'drive motor 21 is on the side of the drive shaft 25 a projection 27 is provided, which serves as an abutment for a helical spring 28, with the help of which a definable force for the V-belt tension is generated. In the area of the largest amplitudes of the motor housing is a fixed to the tub connected switch 31 is arranged, the switch plunger 32 can be actuated by the motor. This can be done by alternating Operation of the motor when changing from ash to spin an intermediate speed that supports the distribution or set a slow spin speed.

4 claims
1 figure

109836/0809

Claims (4)

. ·. VPA 70/9201 claims - - 1. Drum washing machine, in particular a fully automatic washing machine, with a washing drum arranged horizontally with respect to the axis of rotation. and with a drive motor, which can be switched to two different speeds and a downstream V-belt adjustment gear for driving the drum, which is adjustable by changing the speed of the ^ drive motor , characterized in that the V-belt adjustment gear (22) in a known manner with only one adjustable V-belt pulley (24) and the drive motor (21) to change the center distance of the drum (15) motor. ' (21) is suspended pivotably only in the common center of gravity (S) of all pivotable parts (21, 22, 25). 2. Drum washing machine according to claim 1, characterized in that that the drive motor (21) pivotably mounted in its center of gravity (S) via a long shaft (25) with the V-belt adjustment gear (22) is connected. 3. drum washing machine according to claim 1 or 2, characterized in that that on the housing of the drive motor (21) on 'the side the drive shaft (25) is provided with an extension (27) which acts as an abutment for a device which effects the V-belt tension (28) is used. 4. drum washing machine according to claim 1, 2 or 3, characterized in that that in the range of the large amplitudes of the housing of the Drive motor (21) is firmly connected to the tub (14) Switch (31) is arranged so that its switch plunger (32) can be actuated by the drive motor. 1098 36/0809 Blank page