EP0175218B1 - Wechselgetriebe für Waschmaschine - Google Patents

Wechselgetriebe für Waschmaschine Download PDF

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Publication number
EP0175218B1
EP0175218B1 EP85111188A EP85111188A EP0175218B1 EP 0175218 B1 EP0175218 B1 EP 0175218B1 EP 85111188 A EP85111188 A EP 85111188A EP 85111188 A EP85111188 A EP 85111188A EP 0175218 B1 EP0175218 B1 EP 0175218B1
Authority
EP
European Patent Office
Prior art keywords
pulley
flyweights
speed
drum
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85111188A
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English (en)
French (fr)
Other versions
EP0175218A2 (de
EP0175218A3 (en
Inventor
Piero Durazzani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT85111188T priority Critical patent/ATE60379T1/de
Publication of EP0175218A2 publication Critical patent/EP0175218A2/de
Publication of EP0175218A3 publication Critical patent/EP0175218A3/en
Application granted granted Critical
Publication of EP0175218B1 publication Critical patent/EP0175218B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/30—Driving arrangements 
    • D06F37/36—Driving arrangements  for rotating the receptacle at more than one speed

Definitions

  • the present invention relates to a speed variator for a laundry washing machine permitting the drum thereof to be rotated at different speeds.
  • the driving power from the motor is transmitted to the drum by means of a V-belt connected to respective pulleys of the motor and the drum for rotating the latter at the washing and centrifuging speeds.
  • the drum may in addition be rotated at other speeds between the washing speed and the centrifuging speed for carrying out certain phases of the laundering cycle, for instance for achieving dynamic equilibration of the drum or for reduced- speed centrifuging of the laundry.
  • the motor advantageously cooperates with a suitable speed variator permitting the drum to be rotated with a variable transmission ratio.
  • Known speed variators for laundry washing machines include at least one variable-diameter pulley cooperating with flyweights adapted to be shifted between a contracted first position corresponding to the laundering speed of the machine, and a radially displaced second position corresponding to the centrifuging speed. In this manner the effective diameter of the pulley is rapidly varied when passing from the laundering speed to the centrifuging speed, resulting in the V-belt being lifted to a greater diameter for driving the drum at a different transmission ratio.
  • a speed variator of this type is additionally provided with suitable electromechanical or purely mechanical actuating means cooperating with the flyweight-equipped pulley of the laundry washing machine and acting directly on the flyweights thereof so as to interdict or permit the radial displacement thereof to varying degrees.
  • a speed variator of the type defined above comprising flyweights and at least one tensioning pulley biased into engagement with the V-belt with a variable compression force generated by a hydraulic piston connected to the water supply circuit of the machine via at least one solenoid valve.
  • the tensioning pulley is biased into engagement with the V-belt with a variable force, so as to variably interdict or permit the radial displacement of the flyweights for thus varying the effective diameter of the pulley and thereby the rotation of the drum between the laundering speed and the centrifuging speed.
  • This piston permits the rotating speed of the drum to be varied in a continous and progressive manner for rotating the drum at speeds comprised between the laundering and centrifuging speeds.
  • This type of control is obtained by repeatedly energizing the solenoid valve at predetermined intervals so as to define for each desired rotational speed of the drum a relative equilibrium condition between the compressive force exerted on the V-belt by the hydraulic piston and the reactive force exerted by the belt on the piston.
  • a flyweight speed variator there is also provided a hydraulic piston connected to a pivotable arm carrying the motor of the machine, this arm being hinged to a lower portion of the washing tub and biased by a torsion spring towards a position whereat a variable-diameter driving pulley driven by the motor keeps the transmission belt for rotating the drum under tension.
  • the transmission belt extends around the variable-diameter pulley at varying diameters thereof, depending on the rotational speed of the motor and on the relative position assumed by a hydraulic piston operable to interdict or permit the radial expansion displacement to varying degrees of flyweights associated with the pulley.
  • the displacement of the piston permits the rotational speed of the drum to be varied in a continuous and progressive manner, so that the drum operates at the laundering and centrifuging speeds and at different speeds lying therebetween.
  • speed variators operate in a satisfactory and reliable manner, they are particularly critical as regards the control of the drum rotation at the intermediate speeds.
  • the displacement of the piston between its various operating positions is likewise brought about by admitting different quantities of water to the associated cylinder, i.e. by repeatedly energizing the solenoid valve at predetermined intervals under the control of a program control unit of the machine or of other per se known control apparatus.
  • a program control unit of the machine or of other per se known control apparatus As the cooperation between these components is affected by existing play and certain, albeit minimal delays in response, it is practically impossible to always position the piston accurately at its desired operating positions, as would be required for constantly obtaining accurate control of the rotational speed of the drum and thus optimum execution of the different laundering phases.
  • a speed variator for a washing machine which is provided with a driving pulley connected to the motor of the washing machine and associated with flyweights able to vary the effective diameter of the pulley and therefore the speed ratio of the drum, driven by the driving pulley through a transmission belt.
  • Each flyweight is formed by a ball which is slidable along curved portions of walls provided in each part of the associated driving pulley.
  • the variation of the effective diameter of the pulley is obtained by a relative rotational movement between both parts of the pulley obtained by temporarily reversing the mutual direction of rotation of these parts.
  • the speed variator requires an electric motor able to rotate at different speeds for permitting radial displacement of the balls of the flyweights in the different radial positions along the curved portions of the walls of the wall of the pulley part so as to vary the diameter of the pulley.
  • a hydraulic piston or the like for permitting the displacements of the flyweights in different positions is missing.
  • a speed variator of this type as defined by the claim is essentially composed of at least one variable-diameter pulley cooperating with radially outwardly displaceable flyweights and at least one conventional hydraulic piston or the like connected to the water supply circuit of the machine and acting on the flyweights so as to interdict or permit the radial expansion displacement thereof to varying degrees.
  • variable-diameter pulley is designed to permit the displacement of the flyweights not only between positions corresponding to the laundering and centrifuging rotational speeds of the drum, but also to at least one intermediate position corresponding to a further rotational speed of the drum residing between the laundering and the centrifuging speeds.
  • the flyweights are capable of being displaced to and retained at different radial operating positions, even if, for the reasons set forth above, the piston fails to be displaced accurately to the respective operating positions.
  • the present speed variator is capable of accurately maintaining different transmission ratios and thus different rotational speeds of the drum residing between the laundering and the centrifuging speeds.
  • a laundry washing machine 4 having a laundering tub 5 and a drum 6 mounted for rotation within tub 5 and adapted to be rotated by an electric motor 7 with the aid of at least one V-belt 8 operatively connecting a driving pulley 9 of motor 7 to a driven pulley 10 associated to drum 6.
  • driving pulley 9 is composed of a disk 11 fixedly secured to a shaft 12 of motor 7, a further disk 13 mounted for axial displacement relative to fixed disk 11, and another disk 14 secured to the end portion of shaft 12, said disks 13 and 14 cooperating with one another to define therebetween a V-shaped groove for receiving V-belt 8 therein.
  • disks 11 and 13 cooperate to define therebetween at least one internal cavity 15 for accommodating a number of radial-expansion flyweights 16 of preferably cylindrical shape.
  • Motor 7 thus drives driving pulley 9 in unison with flyweights 16.
  • Motor 7 is advantageously designed to operate at two different speeds for rotating drum 6 selectively at a laundering speed of about 58 rpm, and at a centrifuging speed of about 800 rpm, these speeds being of course given merely by way of example.
  • This result may likewise be obtained according to the invention by employing a variable-diameter driven pulley 10 in place of, or in combination with, a variable-diameter driving pulley 9.
  • Flyweights 16 are designed to radially displace to varying degrees in response to the rotational speed of motor 7. Radial expansion displacement of flyweights 16 causes movable disk 13 to be axially displaced towards fixed disk 14 to thereby increase the effective diameter of driving pulley 9. As a result, V-belt 8 is shifted between different effective diameters of driving pulley 9 for rotating drum 6 at correspondingly varying transmission ratios.
  • V-belt 8 is capable of being shifted between a minimum diameter and a maximum effective diameter of driving pulley 9 for rotating drum 6 at the laundering and centrifuging speeds, respectively.
  • the speed variator includes at least one hydraulic piston 17 (shown in Fig. 1 in a front end view) reciprocably slidable in a cylinder 18 connected via a solenoid valve 19 and a tube 20 to a three- way valve 21 included in a water supply conduit 22 of the machine, conduit 22 itself being connected to a detergent distributor 23 and to the water supply mains through a further solenoid valve 24.
  • Piston 17, cylinder 18 and the remaining elements associated therewith are of the type described in EP-A-0 147 625 published on 10.07.1985, mentioned above. Also in the present case, piston 17 is thus connected to at least one tensioning roller (not shown) acting on V-belt 8 with a compressive force depending on the operating position assumed by piston 17 in response to the supply or discharge of water or another suitable liquid to, or from, respectively, cylinder 18 by repeatedly energizing solenoid valve 19 at predetermined intervals. Depending on the operating position of piston 17 it is thus, possible to interdict or permit the radial expansion displacement of flyweights 16 to varying degrees for correspondingly varying the effective diameter of driving pulley 9 in the same manner as described in EP-A-0 147 625 quoted above. It is course also possible to control the radial expansion of flyweights 16 in another manner and/or by different conventional means, without thereby leaving the scope of the present invention.
  • a hydraulic piston 17 of the type described above is connected to a hinged arm carrying the motor and the variable-diameter pulley, said arm being hinged to a lower portion of the laundering tub of the machine and biased by a torsion spring.
  • the hinged arm is capable of assuming various angular positions under the control of the hydraulic piston, the displacement of which thus determines the radial displacement of the flyweights and thus the effective diameter of the driving pulley.
  • FIG. 2 Shown in Fig. 2 is a particular of an embodiment of the present invention.
  • the cavity 15 formed between disks 11 and 13 is defined by planar surface portions 25, 26, 27, 28 and 29 formed on disks 11 and 13 in symmetric relationship and connected with each other, forming different inclinations.
  • the flyweights 16 are thus freely displaceable between the planar surfaces of any pair thereof and come to rest corresponding to each connection zone interconnecting two consecutive planar surface portions.
  • each cylindrical flyweight 16 is thus displaceable from a position A corresponding to the minimum or laundering speed to a position B corresponding to the maximum or centrifuging speed, and to an intermediate position C resting against connection zone 30 for rotating drum 6 at a speed lying between the laundering and centrifuging speeds. It is of course possible to form cavity 15 with addditional planar surface portions, so that flyweights 16 may come to rest at the respective connecting zones therebetween for thus obtaining additional intermediate rotational speeds of the drum.
  • the described speed variator operates as follows:
  • motor 7 is energized to rotate at its lower speed for rotating drum 6 at the laundering speed of for instance 58 rpm.
  • flyweights 16 are retained within cavity 15 at their position designated A, and are prevented from being radially outwardly displaced by the biasing action of piston 17 on belt 8.
  • disks 13 and 14 are at their largest spacing, resulting in driving pulley 9 having its smallest effective diameter.
  • part of the water contained in cylinder 18 may discharged into tub 5, so that piston 17 is pushed back into cylinder 18 by the tension of belt 8.
  • flyweights 16 come to rest at this position and are prevented from being further outwardly displaced in radial direction, so that disk 13 is supported at a position correspondingly closer to fixed disk 14, thereby to increase the effective diameter of driving pulley 9 to rotate drum 6 at a different transmission ratio.
  • Motor 7 is subsequently rotated at its higher speed for rotating drum 6 at the centrifuging speed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Centrifugal Separators (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Pulleys (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detergent Compositions (AREA)

Claims (1)

  1. Wechselgetriebe für eine Waschmaschine mit einem Waschbottich (5), einer in dem Bottich (5) drehbar gelagerten Trommel (6) und einem Motor (7) zum Drehen der Trommel (6) mit einer Waschdrehzahl und einer Schleuderdrehzahl, wobei das Wechselgetriebe wenigstens einen Transmissionsriemen (8), der eine Antriebsriemenscheibe (9) des Motors (7) und eine der Trommel (6) zugeordnete Abtriebsriemenscheibe (10) miteinander verbindet, umfaßt, wobei wenigstens eine der Riemenscheiben, vorzugsweise die Antriebsriemenscheibe (9), mit mehreren radial verstellbaren Fliehgewichten (6) von vorzugsweise zylindrischer Gestalt versehen ist, wobei die Riemenscheibe (9) einen variablen Durchmesser aufweist, das Wechselgetriebe weiterhin wengigstens einen hydraulichen Kolben (17) oder dgl., der in einem entsprechenden Zylinder (18) hin und her verschiebbar ist, der mit dem Wasserzuführkreis (22) der Maschine über wenigstens ein Elektromagnetventil (19) oder dgl. verbunden ist, das dazu eingerichtet ist, die Zuführung und Abführung einer Flüssigkeit zu bzw. von dem Zylinder (18) zu steuern, um den genannten Kolben (17) zwischen verschiedenen Betriebsstellungen zu verstellen, wobei der Kolben (17) mit den Fliehgewichten (16) derart zusammenwirkt, daß die radiale Auswanderung derselben auf unterschiedliche Ausmaße zur Variierung des wirksamen Durchmessers der zugeordneten Riemenscheibe (9) unterbunden oder gestattet wird, wobei die Riemenscheibe (9) mit wenigstens einem inneren Hohlraum (19) versehen ist, der durch ebene geneigte Oberflächenabschnitte (25-29) begrenzt ist, die durch Verbingungszonen (30) miteinander verbunden sind, die unterschiedliche Neigungen bilden, wobei die Fliehgewichte (13) längs den Oberflächenabschnitten (25-29) frei verstellbar sind, um nur an jeder Verbindungszone (30) in Abhängigkeit von der jeweilen Betriebsstellung des Kolbens (17) und der Drehzahl der Riemenscheibe (9) zum Ruhen zu kommen.
EP85111188A 1984-09-18 1985-09-04 Wechselgetriebe für Waschmaschine Expired - Lifetime EP0175218B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85111188T ATE60379T1 (de) 1984-09-18 1985-09-04 Wechselgetriebe fuer waschmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45723/84A IT1181077B (it) 1984-09-18 1984-09-18 Variatore di velocita' per macchine lavabiancheria
IT4572384 1984-09-18

Publications (3)

Publication Number Publication Date
EP0175218A2 EP0175218A2 (de) 1986-03-26
EP0175218A3 EP0175218A3 (en) 1987-08-12
EP0175218B1 true EP0175218B1 (de) 1991-01-23

Family

ID=11257719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111188A Expired - Lifetime EP0175218B1 (de) 1984-09-18 1985-09-04 Wechselgetriebe für Waschmaschine

Country Status (5)

Country Link
EP (1) EP0175218B1 (de)
AT (1) ATE60379T1 (de)
DE (1) DE3581461D1 (de)
ES (1) ES288982Y (de)
IT (1) IT1181077B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1234687B (it) * 1989-02-23 1992-05-26 Zanussi A Spa Industrie Variatore di velocita' per macchine lavabiancheria.
JP2017035202A (ja) * 2015-08-07 2017-02-16 青島海爾洗衣机有限公司ＱｉｎｇＤａｏ Ｈａｉｅｒ Ｗａｓｈｉｎｇ Ｍａｃｈｉｎｅ Ｃｏ．，Ｌｔｄ． 洗濯機
JP6675841B2 (ja) * 2015-08-28 2020-04-08 青島海爾洗衣机有限公司ＱｉｎｇＤａｏ Ｈａｉｅｒ Ｗａｓｈｉｎｇ Ｍａｃｈｉｎｅ Ｃｏ．，Ｌｔｄ． 洗濯機

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1238265A (fr) * 1959-04-16 1960-08-12 Esswein & Cie Dispositif de commande pour variateur de vitesses, notamment pour machines à laver
FR85206E (fr) * 1964-02-03 1965-07-02 Thomson Houston Comp Francaise Bloc d'entraînement autonomme à plusieurs vitesses
DE2045732B2 (de) * 1970-09-16 1973-08-02 Siemens AG, 1000 Berlin u. 8000 München Keilriemen verstellgetriebe, insbesondere fuer den antrieb eines waschautomaten
GB1393134A (en) * 1971-06-11 1975-05-07 Siemens Ag Centrifugal devices
IT1174955B (it) * 1983-12-23 1987-07-01 Zanussi A Spa Industrie Variatore di velocita' per macchine lavabiancheria

Also Published As

Publication number Publication date
EP0175218A2 (de) 1986-03-26
EP0175218A3 (en) 1987-08-12
IT8445723A0 (it) 1984-09-18
DE3581461D1 (de) 1991-02-28
ES288982Y (es) 1987-03-01
ATE60379T1 (de) 1991-02-15
IT8445723A1 (it) 1986-03-18
ES288982U (es) 1986-06-16
IT1181077B (it) 1987-09-23

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