EP0175218A2 - Variateur de vitesse pour machine à laver le linge - Google Patents

Variateur de vitesse pour machine à laver le linge Download PDF

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Publication number
EP0175218A2
EP0175218A2 EP85111188A EP85111188A EP0175218A2 EP 0175218 A2 EP0175218 A2 EP 0175218A2 EP 85111188 A EP85111188 A EP 85111188A EP 85111188 A EP85111188 A EP 85111188A EP 0175218 A2 EP0175218 A2 EP 0175218A2
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.)
Granted
Application number
EP85111188A
Other languages
German (de)
English (en)
Other versions
EP0175218B1 (fr
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
Zanussi Elettrodomestici 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, Zanussi Elettrodomestici SpA filed Critical Industrie Zanussi SpA
Priority to AT85111188T priority Critical patent/ATE60379T1/de
Publication of EP0175218A2 publication Critical patent/EP0175218A2/fr
Publication of EP0175218A3 publication Critical patent/EP0175218A3/en
Application granted granted Critical
Publication of EP0175218B1 publication Critical patent/EP0175218B1/fr
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 expanded second position corresponding to the centrifuging speed. In this manner the 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 expansion thereof to varying degrees.
  • speed variators of the type defined above provided with 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 expansion of the flyweights for thus varying the 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 continuous'adn progressive manner for rotating the drum at speeds comprised between the laundering and centrifuging speeds.
  • This type of control is obtaiend 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 an on the relative position assumed by a hydraulic piston operable to interdict or permit the radial expansion 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 certein, 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 of this type is essentially composed of at least one variable-diameter pulley cooperating with radially expandable 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 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 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 speed variator for a laundry washing machine having a laundering tub, a drum mounted for rotation within said tub, and a motor for rotating said drum at a laundering speed and at a centrifuging speed
  • said speed variator comprising at least one transmission belt operatively connecting a driving pulley of said motor to a driven pulley of said drum, and a number of radially expandable flyweights preferably of cylindrical shape cooperating with at least one of said pulleys, preferably the driving pulley, having a variable effective diameter
  • said speed variator additionally comprising at least one hydraulic piston or similar device slidingly reciprocating in an associated cylinder connected to the water circulation circuit of the machine through at least one solenoid valve or the like operable to permit the supply to or discharge from said cylinder of a liquid so as to displace said piston to different operating positions, said piston cooperating with said flyweights so as to interdict or to permit to varying degrees the expansion thereof thereby to vary the effective diameter of the associated pulley.
  • a speed variator of the type defined above is characterized in that said pulley is formed with at least one internal cavity defined by planar or arcuate surface portions interconnected respectively by inclined ramps or arcuate surface portions of different radius, so that during rotation of said pulley said flyweights are freely displaceable along said surface portions and adapted to be retained adjacent any interconnecting portion between two consecutive surface portions in response to the rotational speed of the pulley and the relative operating position assumed by said piston.
  • 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 copperate to define therebetween at least one internal cavity 15 for accommodating a number of radial-expansion flyweights 16 or 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 obtained according to the invention by employing a variable-diameter driven pulley 10 in place of, or in combination with, a variable-diameter driving pulles 9.
  • Flyweights 16 are designed to radially expand to varying degrees in response to the rotational speed of motor 7. Radial expansion of flyweights 16 causes movable disk 13
  • 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 leat one hydraulic piston 17 (sh6wn 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 descibed in Italian Patent Application No.45737-A/83 filed on 12-23-83 by Applicant.
  • 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.
  • tensioning roller not shown
  • solenoid valve 19 Depending on the operating position of piston 17 it is thus possible to interdict or permit the radial expansion of flyweights 16 to varying degrees for correspondingly varying the effective diameter of driving pulley 9 in the same manner as described in the patent application quoted above. It is of 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.
  • Shown in fig. 2 is a particular of a first 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 diskse 11 and 13 in symmetric relationship and interconnected by suitably inclined ramps.
  • the flyweights 16 are thus freely displaceable between the planar surfaces of any pair thereof and come to rest at the inclined ramps interconnecting 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 additional 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 radially expanding 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 be 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 further expanding in the radial direction, so that disk 13 is supported at a position correspondingly closer to fixed disk 14, thereby to increase the effective diameetr 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.
  • Fig. 3 finally shows a particular of a further embodiment of the speed variator according to the invention.
  • cavity 15 is defined by arcuate surface portions formed in disks 11 and 13 in a symmetric arrangement as shown at 31, 32, 33, 34 and 35, and interconnected by arcuate portions having a different radius of curvature for displacement and selective retention of flyweights 16 at positions designated A, B and C, or at additional intermediate positions, in the same manner as described with referecne to the first embodiment.
  • the speed variator according to the invention is thus of a simple and reliable construction and of reduced dimensions while permitting to obtain accurate control of the various rotational speeds of the drum.

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)
  • Detergent Compositions (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Pulleys (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP85111188A 1984-09-18 1985-09-04 Variateur de vitesse pour machine à laver le linge Expired - Lifetime EP0175218B1 (fr)

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 true EP0175218A2 (fr) 1986-03-26
EP0175218A3 EP0175218A3 (en) 1987-08-12
EP0175218B1 EP0175218B1 (fr) 1991-01-23

Family

ID=11257719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111188A Expired - Lifetime EP0175218B1 (fr) 1984-09-18 1985-09-04 Variateur de vitesse pour machine à laver le linge

Country Status (5)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384149A1 (fr) * 1989-02-23 1990-08-29 INDUSTRIE ZANUSSI S.p.A. Dispositif variateur de vitesse pour une machine à laver le linge
WO2017036371A1 (fr) * 2015-08-28 2017-03-09 青岛海尔洗衣机有限公司 Machine à laver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (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
DE2045732A1 (de) * 1970-09-16 1972-03-23 Siemens Ag Keilriemen Verstellgetriebe, ins besondere fur den Antrieb eines Wasch automaten
FR2141229A7 (fr) * 1971-06-11 1973-01-19 Siemens Ag
EP0147625A2 (fr) * 1983-12-23 1985-07-10 INDUSTRIE ZANUSSI S.p.A. Variateur de vitesse pour une machine à laver le linge

Patent Citations (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
DE2045732A1 (de) * 1970-09-16 1972-03-23 Siemens Ag Keilriemen Verstellgetriebe, ins besondere fur den Antrieb eines Wasch automaten
FR2141229A7 (fr) * 1971-06-11 1973-01-19 Siemens Ag
EP0147625A2 (fr) * 1983-12-23 1985-07-10 INDUSTRIE ZANUSSI S.p.A. Variateur de vitesse pour une machine à laver le linge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384149A1 (fr) * 1989-02-23 1990-08-29 INDUSTRIE ZANUSSI S.p.A. Dispositif variateur de vitesse pour une machine à laver le linge
WO2017036371A1 (fr) * 2015-08-28 2017-03-09 青岛海尔洗衣机有限公司 Machine à laver

Also Published As

Publication number Publication date
IT8445723A0 (it) 1984-09-18
IT1181077B (it) 1987-09-23
DE3581461D1 (de) 1991-02-28
ES288982U (es) 1986-06-16
ES288982Y (es) 1987-03-01
EP0175218B1 (fr) 1991-01-23
ATE60379T1 (de) 1991-02-15
EP0175218A3 (en) 1987-08-12
IT8445723A1 (it) 1986-03-18

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