EP0903433B1 - Riemengetriebe , insbesondere für Wäschetrockner und Waschmaschinen - Google Patents

Riemengetriebe , insbesondere für Wäschetrockner und Waschmaschinen Download PDF

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Publication number
EP0903433B1
EP0903433B1 EP98200641A EP98200641A EP0903433B1 EP 0903433 B1 EP0903433 B1 EP 0903433B1 EP 98200641 A EP98200641 A EP 98200641A EP 98200641 A EP98200641 A EP 98200641A EP 0903433 B1 EP0903433 B1 EP 0903433B1
Authority
EP
European Patent Office
Prior art keywords
belt
pulley
motor
driving
transmission
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
EP98200641A
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English (en)
French (fr)
Other versions
EP0903433A2 (de
EP0903433A3 (de
Inventor
Silvano Fumagalli
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.)
Candy SpA
Original Assignee
Candy SpA
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Filing date
Publication date
Application filed by Candy SpA filed Critical Candy SpA
Publication of EP0903433A2 publication Critical patent/EP0903433A2/de
Publication of EP0903433A3 publication Critical patent/EP0903433A3/de
Application granted granted Critical
Publication of EP0903433B1 publication Critical patent/EP0903433B1/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 
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • D06F58/08—Driving arrangements

Definitions

  • the present invention relates to an improved belt transmission intended' particularly for laundry driers and washing machines but also usable in any situation in which it is necessary to achieve a very high transmission ratio of the order of 50 or more with fairly large inert loads, with motors such as induction motors which have limited starting torque.
  • motors such as induction motors which have limited starting torque.
  • induction motors possibly with a switchable number of poles in washing machines
  • they are preferable to commutator motors which require periodic maintenance.
  • the drive is transmitted from the motor shaft to the drying or washing drum by means of a belt transmission.
  • the same motor preferably also drives directly the fan which produces a ventilation flow in the drum.
  • Efficient ventilation requires a fast speed of rotation of the motor, which is typically an asynchronous motor with two poles, with a nominal rate of rotation of 2800 revolutions/min., whereas the drying drum typically has to rotate at a speed of 50-55 revolutions/min.
  • a laundry drier with a drive mechanism for the drum of the belt and pulley type comprising a motor positioned with its axis parallel to the drum axis.
  • the motor shaft carries a small pulley connected by a belt to a large pulley having an integral hub portion providing a small pulley which is connected by a second belt to a large pulley rigidly secured to the drum shaft, wherein the intermediate pulleys constitute idler pulleys.
  • the centre lines from the idler pulleys to the motor pulley and to the drum pulley extend generally at right angles to each other and the belts are maintained under driving tension by means of a plate carrying at one end a stub shaft on which the idler pulleys are mounted.
  • the plate is guided horizontally and vertically and prevented from tilting out of its vertical plane.
  • the support plate of the idler pulleys is elastically pulled downwards by means of a spring.
  • Said drive mechanism comprises a motor whose shaft carries a pulley connected by a first belt to a large idle pulley integral with a small idle pulley.
  • the small idle pulley is connected by a second belt to a drum pulley.
  • the common axle of the idle pulleys is arranged near the free end of a lever, which is rotatably connected to the base of the housing.
  • a first preloaded spring is connected to the free end of the lever and to the base of the housing, tensioning the. second belt.
  • a second preloaded spring is interposed between two parts of the lever in order to tension the first belt.
  • the motor It is therefore necessary for the motor to be over-sized to a certain extent, at considerable cost, in order to reduce losses and to ensure a higher starting torque or, as occurs in some cases, to use commutator motors, variable-reluctance motors, variable-frequency motors, or even so-called “brushless” motors, all of which are much more expensive.
  • the bearings supporting the motor shaft and the drive shaft are also over-sized in order to withstand the stresses imposed by the pull of the belt, with consequent increases in cost.
  • the belt transmission of the present invention in which a very high transmission ratio is achieved by a driving pulley keyed to the motor shaft. and having a diameter larger than that of the motor shaft, a driven pulley constituted, for example, by the drum of a laundry drier, and a floating pulley having a pair of identical circular winding surfaces and a third circular winding surface with a different diameter from that of the pair, a pair of transmission belts wound around the pair of identical circular surfaces and around one of the driving and driven pulleys, and a third transmission belt wound around the third winding surface and around the other of the driving and driven pulleys.
  • the ratio between the diameters of the pair of identical circular surfaces and of the third circular surface of the floating pulley which, for example, may be of the order of 3:1, it is possible to use a driving pulley with a diameter larger than that of the motor shaft, for example, of 30 mm and to achieve the desired overall transmission ratio of 50 or more.
  • the floating pulley does not require a support axle and is therefore defined as floating since it is kept in position by the opposed pulls of the pair of belts and of the third belt.
  • the position of the floating pulley is defined by the symmetrical pulling conditions of the transmission belts and its axis is aligned with the axes of the driving pulley and of the driven pulley and parallel thereto.
  • a floating pulley in the belt transmission of the invention in combination with a pulley with a diameter which is variable according to the speed of rotation, which may be the floating pulley itself or one or other of the driving and driven pulleys, renders starting and drive reversal even easier by variation of the transmission ratio in dependence on the speed.
  • the transmission belts have to have sufficient resilience to compensate for changes in the length of the path of the belt due to the variable diameter of one of the pulleys or, in equivalent manner, the floating pulley may be biased by resilient restraints to a position in which it is not aligned with the axes of the driving and driven pulleys.
  • an intermediate floating transmission pulley permits the use of belts of two different types of specifically suitable length, thickness and bending capacity, for example, a trapezoidal-sectioned belt for the coupling between the washing/drying drum and the floating pulley and a pair of relatively thin, flat or multi-channelled belts for the coupling between the floating pulley and the motor shaft.
  • this shows, in frontal section, a known laundry drier constituted by a casing 1 housing a drying drum 2 and a drive motor 3 with a shaft 4 parallel to the axis 2A of the drum and perpendicular to the plane of the drawing.
  • the motor 3 which is preferably of the two-pole induction type, drives directly a fan, not shown, and, by means of a belt transmission 5, the drum 2.
  • the motor rotates at a nominal speed of 2800 revolutions/minute when it is supplied with a voltage alternating at a frequency of 50Hz, in order to achieve the desired speed of rotation of the drum of 50/55 revolutions/minute, it is necessary for the belt 5 to be wound directly around the periphery of the drum 2 which has a diameter of the order of 55 cm and around the shaft of the motor which has a diameter of the order of 10 mm.
  • the angle through which the belt is wound on the shaft 4 is very small, of the order of 90° or a little more, and the belt is subject to considerable bending stress with a radius or curvature of the order of 5 mm.
  • the coupling between the drum 2 and the motor 3 is formed by a belt transmission constituted by three belts and by a floating pulley 6.
  • floating pulley is meant a pulley which is not engaged on a support axle in a fixed and predetermined position but which is free to move according to the pull exerted by the belts which are wound around the pulley.
  • the pulley 6 has a first circular surface 7 for the winding of a first belt 5, flanked axially on opposite sides by two circular surfaces 8, 9 for the winding of two identical belts 10 and 11.
  • the first surface 7 has a diameter of the order of 30 mm and the pair of circular surfaces 8, 9 has a diameter of the order of 90 mm.
  • the generally circular winding surfaces 7, 8, 9 may be either cylindrical or grooved, or may even have a recessed trapezoidal shape, according to the type of belt to be used.
  • the larger-diameter surfaces 8, 9 may have restraining shoulders for preventing axial displacement of the belts relative to the pulley.
  • the first belt 5 is wound around the periphery of the drum 2 and around the first surface 7 of the pulley 6.
  • the other two belts 10, 11 are wound, respectively, around the other circular surfaces 8, 9 of the pulley 6 and around a hub 12 keyed to the motor shaft 4.
  • the axis of the pulley 6 In rest conditions, that is, in the absence of transmitted torque, the axis of the pulley 6 is parallel to and aligned with the axis of the motor shaft 4 and the axis of the drum, that is, in the plane defined thereby, by virtue of the symmetrical pull of the belts.
  • Figure 4 shows the pulley 6 in continuous outline in the rest position.
  • the changes in the position of the pulley have the effect of introducing into the transmission a resilient component which temporarily disconnects the motor shaft from the driven member to a certain extent.
  • This type of transmission with a floating pulley can therefore advantageously be used not only for laundry dryers but also for washing machines in which, as is known, the washing is carried out with periodic reversal of the sense of rotation of a washing drum.
  • the transmission system described is suitable for the development of a transmission with a ratio which is variable in dependence on speed, making it even easier to start and reverse the movement of a drive system with an induction motor.
  • the floating pulley 14 has a first winding surface 15 for a trapezoidal-sectioned belt, the diameter of this surface being variable in dependence on speed, flanked by two identical circular surfaces 16, 17 of larger diameter.
  • a first belt 18, in this embodiment of trapezoidal section, is wound around the first surface 15 and around the periphery of the drum 2, coupling them kinematically.
  • a pair of belts 19, 20 is wound around the two circular surfaces 16, 17 and around a hub 21 keyed to the shaft 4 of the motor 3.
  • a belt transmission with a variable transmission ratio is thus formed.
  • the floating pulley 14 is advantageously supported by a floating axle 22 biased resiliently by a spring 23 towards a position removed from the plane defined by the axis of the motor shaft and by the axis of the drum.
  • this provides the belts with a path the length of which is independent of the variable diameter of the fist winding surface 15.
  • the axis of the floating pulley may be aligned with the axes of the motor shaft and of the drying drum.
  • Figure 6 shows an embodiment of a floating pulley with a variable diameter in a detailed diametral section.
  • the pulley is constituted by a hub 24 having a conical flange 25 terminating at its periphery in a cylindrical winding surface for the belt 20.
  • a conical flange 26 is mounted for sliding axially on the hub 24, facing the flange 25.
  • the belt 18 is fitted between the two flanges 25, 26 and, as a result of the pull imparted, tends to keep the two flanges spaced apart.
  • a third conical flange 27 is fixed firmly to the hub 24 and terminates at its periphery in a cylindrical winding surface for the belt 19.
  • the two flanges 26 and 27 form an annular housing for a plurality of balls 28, 29.
  • the width of the housing in the axial direction decreases towards the periphery of the pulley.
  • the balls 28, 29 tend to move away from the axis of rotation as a result of the centrifugal effect and tend to move the flange 26 towards the flange 25, overcoming the axial thrust exerted by the belt 18 on the flange 26.
  • the trapezoidal-sectioned belt 18 is forced to be wedged between the flanges along a winding surface of larger diameter and hence with a higher transmission ratio.
  • the ratio varies with variations in the speed of rotation and increases therewith, although not proportionally.
  • the transmission system thus has an overall transmission ratio of 100-150 upon starting, permitting easy starting, decreasing to a value of 50 in running conditions.
  • the cylindrical surfaces 16, 17 for the winding of the belts 19, 20 advantageously extend axially to permit an equal relative axial displacement of the belts.
  • the spring 23 acts on the axle 22 of the floating pulley by means of a stirrup or fork, not shown, to keep the axle 22 parallel to the axle of the motor shaft and of the drying drum.
  • the floating pulley adopts the shape of a cylindrical element extended axially at its opposite ends by two cylindrical elements of smaller diameter.
  • the washing drum 2 has a driving pulley 30 with a diameter typically of 278 mm.
  • a motor 3 is coupled to the pulley 30 by means of a first transmission belt which is wound around a first circular surface 33 with a diameter variable between approximately 45 mm at low speeds of rotation and approximately 70 mm at high speeds of rotation, of a variable-ratio floating pulley 34.
  • the belt 31, which is trapezoidal, may be extensible.
  • the floating pulley 34 of the type already described has a pair of circular surfaces 35 with diameters of about 45 mm.
  • a pair of belts 36 preferably of the POLY-V type, is wound around the circular surfaces 35 and around a shaft or hub 37 rotated by the motor 31.
  • the solution commonly used provides for direct coupling of the pulley 30 to the motor 31 by means of a trapezoidal-sectioned belt and a hub with a variable diameter keyed to the motor shaft.
  • the maximum diameter of the hub is about 60 mm and the minimum diameter which is imposed by the use of a trapezoidal belt, may be no less than 46 mm, which necessitates the use of a speed of rotation for washing of about 75 revolutions/minute with a consequent reduction in washing efficiency.
  • commutator motors are used, and are coupled to the pulley 30 by means of a multi-channelled belt which excludes the possibility of the use of a variable-diameter hub.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Claims (9)

  1. Riemengetriebe umfassend eine an einer Motorwelle (4) angebrachte oder durch die Motorwelle (4) gebildete Antriebsscheibe (12), eine an einer Abtriebswelle (2A) angebrachte Abtriebsscheibe (2), eine Ablenkscheibe (6, 14) mit einer ersten kreisförmigen Fläche (7, 15) und einer zweiten kreisförmigen Fläche (8, 16; 9, 17), die zur ersten Fläche koaxial ist, zum Umtreiben eines ersten Riemens (5, 18) bzw. eines zweiten Riemens (10, 19; 11, 20), wobei der erste Riemen um die erste kreisförmige Fläche der Ablenkscheibe und eine der Antriebs- (12) oder Abtriebsscheiben (2) läuft, wobei der zweite Riemen (10, 19; 11, 20) um die zweite kreisförmige Fläche (8, 16; 9, 17) der Ablenkscheibe (6, 14) und die andere der Antriebs- (12) bzw. Abtriebsscheiben (2) läuft, dadurch gekennzeichnet, dass die Ablenkscheibe (6, 14) eine zur zweiten kreisförmigen Fläche (8, 16; 9, 17) identische und zur ersten Fläche (7, 15) koaxiale dritte kreisförmige Fläche (9, 17; 8, 16) umfasst, wobei die zweite und dritte Fläche jeweils eine auf jeder Seite der ersten Fläche (7, 15) axial angeordnet sind, das Getriebe einen zum zweiten Transmissionsriemen (10, 19; 11, 20) identischen dritten Transmissionsriemen (11, 20; 10, 19) umfasst und der um die dritte kreisförmige Fläche (9, 17; 8, 16) und dieselbe der Antriebs- (12) und Abtriebsscheiben (2) wie der zweite Riemen (10, 19; 11, 20) läuft, wobei die Ablenkscheibe (6, 14) durch den entgegengesetzten Zug der ersten (5, 18) und des Paares zweiter (10, 19; 11, 20) und dritter Transmissionsriemen (11, 20; 10, 19) in Position gehalten ist.
  2. Riemengetriebe nach Anspruch 1, bei dem die Ablenkscheibe (6) wie eine Spule geformt ist, wobei die erste Lauffläche (7) die Vertiefung der Spule ist und das Paar Laufflächen (8, 9) durch die Umfangsflächen der Seitenkanten der Spule gebildet sind.
  3. Riemengetriebe nach Anspruch 1 oder Anspruch 2, umfassend Mittel (23) zum nachgiebigen Vorspannen der Ablenkscheibe in eine Ruheposition.
  4. Riemengetriebe nach einem der vorhergehenden Ansprüche, bei dem eine ausgewählt aus Antriebsscheibe und Ablenkscheibe eine Scheibe (14) mit einem Durchmesser ist, der in Abhängigkeit von der Umdrehungsgeschwindigkeit variabel ist, um das Übersetzungsverhältnis des Riemengetriebes (18) zu verändern.
  5. Riemengetriebe nach Anspruch 4, bei dem die Scheibe mit variablem Durchmesser strukturell axialsymmetrisch ist.
  6. Riemengetriebe nach Anspruch 4 oder 5, worin die Riemen ausreichend Nachgiebigkeit aufweisen, um Veränderungen in der Länge des Riemenweges bedingt durch variablen Durchmesser einer der Scheiben zu kompensieren.
  7. Wäschetrockner umfassend einen Induktionsmotor zum Antreiben einer Trocknungsdrehtrommel und eines Ventilators mit einem Riemengetriebe nach einem der vorhergehenden Ansprüche zum Koppeln der Drehtrommel mit dem Motor.
  8. Waschmaschine umfassend einen Induktionsmotor zum Antreiben einer Waschtrommel und mit einem Riemengetriebe nach einem der vorhergehenden Ansprüche 1-6 zum Koppeln des Motors mit einer Waschtrommel.
  9. Waschmaschine umfassend einen variablen Kommutatormotor oder einen äquivalenten Motor und mit einem Riemengetriebe nach einem der vorhergehenden Ansprüche 1-6 zum Koppeln des Motors mit einer Waschtrommel.
EP98200641A 1997-09-18 1998-03-02 Riemengetriebe , insbesondere für Wäschetrockner und Waschmaschinen Expired - Lifetime EP0903433B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI970670U 1997-09-18
IT1997MI000670U IT237916Y1 (it) 1997-09-18 1997-09-18 Trasmissione a cinghia perfezionata,in particolare perasciugabiancheria e lavabiancheria

Publications (3)

Publication Number Publication Date
EP0903433A2 EP0903433A2 (de) 1999-03-24
EP0903433A3 EP0903433A3 (de) 1999-07-21
EP0903433B1 true EP0903433B1 (de) 2003-09-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200641A Expired - Lifetime EP0903433B1 (de) 1997-09-18 1998-03-02 Riemengetriebe , insbesondere für Wäschetrockner und Waschmaschinen

Country Status (2)

Country Link
EP (1) EP0903433B1 (de)
IT (1) IT237916Y1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018102326U1 (de) * 2018-04-25 2018-11-06 Peter Lutz Übersetzungsgetriebe sowie Windkraftanlage und elektrischer Antrieb für Fahrzeuge mit einem solchen Übersetzungsgetriebe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20119879U1 (de) * 2001-12-07 2002-02-21 Hanning Elektro-Werke GmbH & Co. KG, Oerlinghausen, 33813 Oerlinghausen Wäschetrockner
DE102006003162A1 (de) * 2006-01-23 2007-07-26 BSH Bosch und Siemens Hausgeräte GmbH Spannvorrichtung für einen Vorgelege-Antrieb eines Haushalt-Wäschetrockners
KR101699754B1 (ko) * 2010-08-09 2017-01-25 엘지전자 주식회사 세탁물 처리장치
US9096965B2 (en) 2010-08-09 2015-08-04 Lg Electronics Inc. Apparatus for treating laundry having a ring shaped circular guide

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337586A (en) * 1942-03-25 1943-12-28 Bendix Home Appliances Inc Belt transmission mechanism
US2506516A (en) * 1945-09-19 1950-05-02 Hamilton Mfg Co Laundry drier
US2942447A (en) * 1957-08-07 1960-06-28 Whirlpool Co Clothes washing and extracting machine
FR1352845A (fr) * 1962-10-31 1964-02-21 Perfectionnements aux machines à laver le linge à tambour horizontal
JPS60234160A (ja) * 1984-05-07 1985-11-20 Hitachi Seiko Ltd ベルト駆動機構
DE4438425B4 (de) * 1994-10-27 2006-10-26 BSH Bosch und Siemens Hausgeräte GmbH Antriebseinrichtung für einen Haushalt-Wäschetrockner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018102326U1 (de) * 2018-04-25 2018-11-06 Peter Lutz Übersetzungsgetriebe sowie Windkraftanlage und elektrischer Antrieb für Fahrzeuge mit einem solchen Übersetzungsgetriebe
US11920560B2 (en) 2018-04-25 2024-03-05 Peter Lutz Transmission gearing for a wind power plant or an electric drive for vehicles

Also Published As

Publication number Publication date
ITMI970670U1 (it) 1999-03-18
EP0903433A2 (de) 1999-03-24
EP0903433A3 (de) 1999-07-21
IT237916Y1 (it) 2000-09-29

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