EP2671997A1 - Waschmaschine mit einer Wäschebehandlungseinheit mit Direktantriebsanordnung - Google Patents

Waschmaschine mit einer Wäschebehandlungseinheit mit Direktantriebsanordnung Download PDF

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Publication number
EP2671997A1
EP2671997A1 EP12170645.1A EP12170645A EP2671997A1 EP 2671997 A1 EP2671997 A1 EP 2671997A1 EP 12170645 A EP12170645 A EP 12170645A EP 2671997 A1 EP2671997 A1 EP 2671997A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
stator
laundry machine
hub
tub
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.)
Withdrawn
Application number
EP12170645.1A
Other languages
English (en)
French (fr)
Inventor
Igor Colin
Paolo Barro
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP12170645.1A priority Critical patent/EP2671997A1/de
Priority to PCT/EP2013/061315 priority patent/WO2013182495A1/en
Publication of EP2671997A1 publication Critical patent/EP2671997A1/de
Withdrawn legal-status Critical Current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
    • D06F37/26—Casings; Tubs
    • 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 

Definitions

  • the present invention relates to a laundry machine (e.g. a washing machine or a washer/drier machine), provided with a laundry treatment unit comprising a direct drive arrangement.
  • a laundry machine e.g. a washing machine or a washer/drier machine
  • a laundry treatment unit comprising a direct drive arrangement.
  • laundry machines such as washing machines or washing machines with drying function (also called washer/driers) usually have a laundry treatment unit which is built in a housing of the laundry machine and connected to operation means for operating the laundry treatment unit.
  • a laundry treatment unit comprises a tub, wherein a drum is rotatably arranged within the tub and wherein laundry to be washed is placed within the drum.
  • a motor is usually provided in a region below or laterally to the tub, being connected to the drum by means of a belt for driving the drum.
  • direct drive motor As an alternative to the belt driven drum it is possible to use a so called “direct drive motor” for driving the drum.
  • the stator of the direct drive motor is fixed to the rear wall of the tub of the laundry machine, and the rotor of this motor is directly connected to the shaft rotating the drum, so as to be able to rotate this shaft (and therefore the drum) without using a further mechanical transmission device (e.g. a belt pulley system).
  • the document US 6,681,602 B2 discloses a washing machine including a washing tub having a plastic injection-molded rear wall with a shaft mounted in the rear wall.
  • a laundry drum is connected to the shaft in a rotationally fixed manner.
  • a drive mechanism is connected to the drum for driving the drum, the drive mechanism has a stator support part.
  • the rear wall is plastic injected molded around the stator support part for rotationally fixing the stator support part to the rear wall of the tub.
  • the drive mechanism Disposed on the rear wall of the washing tub is a drive mechanism.
  • the drive mechanism includes a rotor of a bell-shaped form that, like the laundry drum, is connected to the shaft in a rotationally fixed manner.
  • a screw is provided, the screwing of the rotor on the shaft being fixed in rotation by positive fitting through an adapted connection.
  • a laundry machine provided with a laundry treatment unit comprising a tub with a hub fixed to its back wall for supporting a shaft rotating a drum, the hub comprising a sleeve on which the stator of a drive mechanism is mounted and fixed by a fixing element fastened to the sleeve, the laundry treatment unit can be assembled in a very easy and quick way.
  • a laundry machine provided with a laundry treatment unit comprising:
  • the hub comprises a sleeve and the stator is mounted on the sleeve and is fixed to the sleeve by a fixing element fastened to the sleeve.
  • stator can be fixed to the hub in an easy and stable way. Further, the stator can be mounted in its intended working position.
  • the stator is mounted on the sleeve coaxially to the hub.
  • the hub itself, is arranged coaxially to a rotational axis which is the rotational axis of the shaft, and therefore of the drum, and also to the rotor which is fixed to the shaft.
  • the stator can be arranged coaxially to the hub and, consequently, arranged coaxially to the drum and to the rotor.
  • the tub and/or the hub form a blocking element, wherein the stator abuts against the blocking element in a mounted position on the sleeve.
  • the blocking element defines a definite position for the stator. A worker can place the stator on the sleeve and fix it thereto. Thus, the manufacturing process of the laundry treatment unit is simplified.
  • the blocking element is a block step.
  • a block step can be easily provided in the manufacturing process and defines a definite working position of the stator.
  • tub and the hub form a cylindrical forming comprising a cylindrical base and the sleeve.
  • a cylindrical forming comprising a cylindrical base and the sleeve where the stator is mounted to, integrates the components for mounting and positioning of the stator.
  • the block step is formed between the cylindrical base and the sleeve.
  • Cylindrical base and sleeve can be both formed such that the sleeve is formed by the hub which is embedded in the plastic material of the tub and that the cylindrical base is formed by the tub enclosing the hub.
  • the manufacturing process is simplified.
  • the fixing element is a ferrule.
  • stator can be clamped on the sleeve, in particular between blocking element and ferrule.
  • the mounting process is simplified even more.
  • the ferrule has an internal thread provided on an inner side, wherein the ferrule is screwed to the sleeve and fixes the stator on the sleeve by pressing the stator against the block step.
  • the stator can be easily fixed to the sleeve. The worker has to carry out only one screwing action and the stator can be mounted in its intended working position without any further adjustment steps.
  • the hub comprises an inner shell, wherein the inner shell forms the sleeve.
  • the hub comprises an outer shell and a base plate connecting the inner shell with the outer shell.
  • the hub is at least partially enclosed by an enclosure made of the plastic material of the tub.
  • the hub is very rigidly fixed to the tub. Further the material of the hub, which is embedded in the plastic material of the tub, is protected from the contact with water and thereby from corrosion.
  • the outer shell is completely enclosed by the enclosure and the inner shell is partially enclosed by the enclosure, wherein the inner shell projects in direction of a rotational axis beyond the enclosure and wherein the block step is formed by the enclosure.
  • the block step is formed by the enclosure, i.e. by the plastic material, wherein the inner shell of the hub projects beyond the block step.
  • This formation of the block step can be produced advantageously in an injection moulding process and improves therefore the manufacturing process.
  • stator and the sleeve comprise a centering device for fixing the angular position of the stator with respect to the sleeve.
  • the centering device provides a rotationally fixed fastening or in other words a torque-proof connection of stator and sleeve.
  • the stator cannot rotate, when the rotational field is generated.
  • the centering device comprises at least one rib extending longitudinally from the stator (or in a further embodiment from the sleeve) in direction of the rotational axis, and at least one slot extending longitudinally in the sleeve (or in a further embodiment in the stator) in direction of the rotational axis, wherein the rib engages into the slot.
  • the stator comprises a ring wherein the ring abuts against the blocking element in a mounted position of the stator and wherein the fixing element presses the ring against the blocking element.
  • stator on the cylindrical forming. Further the stator is precisely fixed in its predetermined position.
  • FIG 1 schematically illustrates a lateral cross section of a laundry machine 100 according to the invention.
  • the laundry machine 100 illustrated in Figure 1 is a washing machine of the front loading type; it is however clear that the invention can be applied as well to a top-loading washing machine and to a washer/drier, both of the front loading and top loading type.
  • the laundry machine 100 comprises a housing 110 containing a laundry treatment unit 1 comprising a washing tub 2 (or simply tub), preferably supported by coils and dampers, not illustrated, fixed to the housing 110.
  • a laundry treatment unit 1 comprising a washing tub 2 (or simply tub), preferably supported by coils and dampers, not illustrated, fixed to the housing 110.
  • Tub 2 enclosed a rotary drum 300 (or simply drum), wherein laundry can be loaded to be submitted to a washing process (or also to a drying process in the case of a washer/drier).
  • the drum 300 is provided, for its rotation, with a shaft 200, protruding from its back surface, rotatably supported by a hub 27 (provided with bearings, not illustrated) fixed to the back wall 4 of the tub 2; preferably the hub 27 is fixed to the 2 by an at least partial over-injection of the tub 2 on the hub 27.
  • the hub 27 is provided with a sleeve 7, which is substantially perpendicular to the back wall 4 of the tub and which is substantially coaxial, in the assembled condition, to the shaft 200.
  • Laundry machine 100 preferably comprises a water inlet circuit 120, adapted to take in the tub 2 a washing liquid (e.g. water and water mixed with washing/rinsing products), and a water draining circuit 130, adapted to drain the washing liquid from the tub 2.
  • a washing liquid e.g. water and water mixed with washing/rinsing products
  • a water draining circuit 130 adapted to drain the washing liquid from the tub 2.
  • Laundry machine 1 may comprise also further electronic and mechanical devices (control units, level sensors, etc), which will not be described in detail.
  • FIG 2 illustrates an exploded perspective view of a laundry treatment unit 1 comprising a direct driven rotary drum 300.
  • the laundry treatment unit 1 comprises a tub 2 which preferably a back wall 4, preferably with enforcement ribs 23.
  • the ribs 23 are advantageously arranged concentrically around a cylindrical forming 3 which is arranged in a central position of the back wall 4 and provide structural rigidity which is necessary due to vibrations being generated by the rotating drum. Further the ribs extend longitudinally in a radial direction.
  • the tub 2 is preferably made of a plastic material in an injection moulding process.
  • Laundry treatment unit 1 is provided with a drive mechanism 400 comprising an electric motor having a ring-shaped stator 8 provided with a plurality of poles 12.
  • the poles 12 are distributed circumferentially around a center of the stator 8.
  • windings 24 are wound around the poles 12 for enabling a rotating magnetic field to be generated.
  • the stator 9 comprises a ring 11, e.g. a ring plate or a ring element, which serves as a basis of the stator and to which the poles 12 and the windings 24 are fastened.
  • the ring 11 has a center hole with an inner wall 26.
  • the inner wall advantageously has a centering device 13 which can be formed as ribs or webs. Said centering device 13 advantageously extends longitudinally in direction of a rotational axis A.
  • tub 2 and the hub 27 form a cylindrical forming (or cylindrical body) 3 comprising a cylindrical base 6 and the sleeve 7.
  • At least part of the sleeve 7 may be by the plastic material of the tub 2, since the tub 2 is advantageously over-injected (or over-moulded) on the hub 27, so as to at least partially enclosing the latter.
  • the sleeve 7 advantageously has slots 8a, 8b formed thereto, e.g. arranged on opposite sides of the wall of the sleeve 7.
  • the slots 8a, 8b extend longitudinally in direction of the rotational axis A.
  • the slots 8a, 8b are formed in such a way that the centering device 13 of the stator 9 fit thereto.
  • the diameter of the center hole of the ring 11 is dimensioned such that the ring 11, and thereby the stator 9 can be plugged (or mounted or fitted) on the sleeve 7.
  • the centering device 13 engages the slots 8a, 8b and provides a fixation in a rotationally fixed manner.
  • the stator 9 can be moved on the sleeve 7 until the centering device 13 contacts an end of the slots 8a, 8b and/or until the ring 11 abuts against the block step 5. Thus, it is secured that the stator 9 is arranged in a prefixed final position with respect to slot 7.
  • a ferrule 14 is advantageously provided having an inner side 16 and an outer side 17. On the outer side 17 of the ferrule 14 recesses 15 can be provided. The inner side 16 of the ferrule 14 can be provided with a thread.
  • the ferrule 14 is a ring-shaped element being dimensioned such that it can be screwed by means of the thread on its inner side 16 onto a mating thread provided on the outer side of the sleeve 7.
  • the ferrule 14 is advantageously screwed until it abuts to the ring 11 of the stator 9 and, thus, fixes the stator relative to the longitudinal extension of the rotational axis A.
  • a rotor 10 having an end wall 20 and a circumferential wall 21 is further provided.
  • the drum 300 is arranged inside the tub 2.
  • the shaft 200 being torque-proof connected to the drum 300 (i.e. shaft 200 and drum 300 are fixed one another, and therefore in particular they are fixed with respect of reciprocal rotation), is advantageously rotationally supported by bearings, not illustrated, provided inside the hub 27. Further the shaft 200 is advantageously fixed to a fastening section 25 of the rotor 10.
  • a rotation of the rotor 10 effects a rotation of the shaft 200 and of the drum 300 fixed to the shaft 200.
  • magnets 500 are advantageously arranged circumferentially along the circumferential wall 21 and fixedly attached to the circumferential wall 21 for drawing or pushing the rotor 10 into rotation.
  • the rotor 10 is advantageously arranged in a final position such that the magnets are arranged adjacent to the poles 12 of the stator 9 and that the radial distance between the magnets and poles 12 is minimal, when the rotor 10 rotates.
  • windings are wound around the poles 12 for providing a rotating magnetic field for driving the rotor 10.
  • FIG 3 illustrates a detailed sectional and schematic view of a back wall 4 of the laundry treatment unit 1 comprising a direct driven rotary drum.
  • the hub 27 comprises an inner shell 28 and an outer shell 28, both integrally formed with a base plate 30.
  • the hub 27 is made of a rigid and stable material such as metal, e.g. a steel material or aluminium.
  • the hub 27 is advantageously at least partially enclosed by an enclosure 19, wherein the enclosure 19 is formed by the plastic material of the tub 2 (i.e. enclosure 19 is a layer made of the plastic material of the tub 2).
  • the outer shell 29 and the base plate 30 are advantageously completely enclosed by plastic material.
  • the hub 27 is rigidly fixed to the tub 2.
  • the inner shell 28 is supported on an outer side by the enclosure 19, wherein the enclosure 19 forms the cylindrical base 6 on the outer side of the inner shell 28.
  • the inner shell 28 preferably protrudes partially outside the enclosure 19, wherein a mating thread 18 is preferably provided on the protruding part of the inner shell 28.
  • Bearing seats 30a, 30b can be provided on the interior side of the inner shell 28. Bearings for supporting the shaft 300can be positioned there.
  • the stator 9 is not shown in this view and shall be provided plugged on the outer side of the sleeve 7 until the final position of the stator 9 is reached. E.g. the stator 9 and in particular the ring 11 can abut against the block step 5.
  • the ferrule 14 may be screwed onto the mating thread 18 by means of its thread arranged on its inner side 17.
  • the stator 9 can be fixedly arranged on the sleeve in its prefixed final position.
  • the rotor 10 can be detached from the shaft 200 and removed. Then, the ferrule 14 can be detached from the mating thread of the sleeve 7 and the stator 9 can be detached from the sleeve 7. Therefore it is very easy to change the stator 8 and/or the rotor 10 in the case of damage.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP12170645.1A 2012-06-04 2012-06-04 Waschmaschine mit einer Wäschebehandlungseinheit mit Direktantriebsanordnung Withdrawn EP2671997A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12170645.1A EP2671997A1 (de) 2012-06-04 2012-06-04 Waschmaschine mit einer Wäschebehandlungseinheit mit Direktantriebsanordnung
PCT/EP2013/061315 WO2013182495A1 (en) 2012-06-04 2013-05-31 Laundry machine comprising a laundry treatment unit with direct drive arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12170645.1A EP2671997A1 (de) 2012-06-04 2012-06-04 Waschmaschine mit einer Wäschebehandlungseinheit mit Direktantriebsanordnung

Publications (1)

Publication Number Publication Date
EP2671997A1 true EP2671997A1 (de) 2013-12-11

Family

ID=48579036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12170645.1A Withdrawn EP2671997A1 (de) 2012-06-04 2012-06-04 Waschmaschine mit einer Wäschebehandlungseinheit mit Direktantriebsanordnung

Country Status (2)

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EP (1) EP2671997A1 (de)
WO (1) WO2013182495A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755537A1 (de) * 1997-12-13 1999-06-17 Fhp Motors Gmbh Transportsicherung für einen Motorbausatz eines kollektorlosen Gleichstrommotors als Außenläufermotor
DE19937229A1 (de) * 1999-08-06 2001-02-08 Bsh Bosch Siemens Hausgeraete Antriebsvorrichtung für eine Waschmaschine
US6681602B2 (en) 1999-12-15 2004-01-27 Bsh Bosch Und Siemens Hausgeraete Gmbh Washing tub for a washing machine
EP1538252A1 (de) * 2003-12-01 2005-06-08 Electrolux Home Products Corporation N.V. Laugenbehälter aus Kunststoff für eine Wäschewaschmaschine
EP1659204A1 (de) * 2004-11-17 2006-05-24 Samsung Electronics Co., Ltd. Waschmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755537A1 (de) * 1997-12-13 1999-06-17 Fhp Motors Gmbh Transportsicherung für einen Motorbausatz eines kollektorlosen Gleichstrommotors als Außenläufermotor
DE19937229A1 (de) * 1999-08-06 2001-02-08 Bsh Bosch Siemens Hausgeraete Antriebsvorrichtung für eine Waschmaschine
US6681602B2 (en) 1999-12-15 2004-01-27 Bsh Bosch Und Siemens Hausgeraete Gmbh Washing tub for a washing machine
EP1538252A1 (de) * 2003-12-01 2005-06-08 Electrolux Home Products Corporation N.V. Laugenbehälter aus Kunststoff für eine Wäschewaschmaschine
EP1659204A1 (de) * 2004-11-17 2006-05-24 Samsung Electronics Co., Ltd. Waschmaschine

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Publication number Publication date
WO2013182495A1 (en) 2013-12-12

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