EP2452006B1 - Tragstern für eine waschmaschinentrommel - Google Patents

Tragstern für eine waschmaschinentrommel Download PDF

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Publication number
EP2452006B1
EP2452006B1 EP10744730.2A EP10744730A EP2452006B1 EP 2452006 B1 EP2452006 B1 EP 2452006B1 EP 10744730 A EP10744730 A EP 10744730A EP 2452006 B1 EP2452006 B1 EP 2452006B1
Authority
EP
European Patent Office
Prior art keywords
spider
seat
drum
wall portions
screw
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.)
Not-in-force
Application number
EP10744730.2A
Other languages
English (en)
French (fr)
Other versions
EP2452006A1 (de
Inventor
Marco Angelini
Alberto Vitali
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.)
Whirlpool EMEA SpA
Original Assignee
Whirlpool EMEA 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 Whirlpool EMEA SpA filed Critical Whirlpool EMEA SpA
Publication of EP2452006A1 publication Critical patent/EP2452006A1/de
Application granted granted Critical
Publication of EP2452006B1 publication Critical patent/EP2452006B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/206—Mounting of motor
    • 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
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • 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
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups
    • D06F37/269—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups for the bearing of the rotary receptacle

Definitions

  • the present invention relates to a spider for laundry treating machines equipped with a rotary drum according to the preamble of claim 1.
  • Laundry treating machines such as washing machines, washing/drying machines and clothes dryers, are typically equipped with a rotary drum.
  • Motion is generated by a motor, usually an electric one, and is then transmitted to the drum, which is free to rotate about an axis, whether vertical, horizontal or inclined (depending on the type of laundry treating machine).
  • spider will refer to the transmission unit that transmits the motion from the motor shaft to the drum while also acting as a support for the latter.
  • Known spiders normally comprise three arms spaced at 120° apart and extending from a common hub, which is coupled to a transmission shaft driven by the motor.
  • each spider arm has one or more seats for one or more screws, e.g. one pair of screws, for coupling it to the drum edge;
  • the seat is typically cylindrical and threaded, and its axis is perpendicular to that of the motor shaft.
  • Said threaded seat is very important because this is the point where the strains originating from the exchange of forces between the drum and the spider concentrate; it is therefore of primary importance that said threaded seat is strong and manufactured with the utmost care.
  • Prior-art spiders are typically made of metal (because of the loads that they must withstand in operation) and are manufactured by die casting; the aforementioned threaded seats can be obtained on such spiders in two ways: by starting from a solid piece, which is then machined through chip removal machining, or by designing the die appropriately to include such seats.
  • the cylindrical seat for the drum edge coupling screw is first drilled (by using a drilling machine) and then tapped internally. This implies a certain production cost for manufacturing the part, due to the fact that mechanical machining is required in addition to the die casting process.
  • the threaded seat for the drum edge coupling screw is obtained in the die by using suitable pins.
  • the present invention relates to a spider for laundry treating machines equipped with a rotary drum, wherein the seat for the screw used for coupling the spider to the machine drum is defined by at least a first and a second perimetric wall portions, said portions extending on a semicylindrical profile and being arranged at different heights.
  • the present invention also relates to a method for manufacturing such a spider.
  • the present invention further relates to a laundry treating machine, such as a washing machine, a washing/drying machine, a clothes dryer or the like, equipped with a rotary drum supported by a spider according to the present invention.
  • a laundry treating machine such as a washing machine, a washing/drying machine, a clothes dryer or the like, equipped with a rotary drum supported by a spider according to the present invention.
  • the present invention is based on the idea of simplifying the seat creation step by using a single-movement die and by allowing the use of a metric self-tapping screw for tapping the seat, since the chip formed when inserting the screw is easily evacuated and the spider is thus prevented from being damaged during the removal of the screw.
  • the screw seat is defined by opposite and alternated portions which can be obtained through a pressing operation by using a single-movement die, which is beneficial in terms of costs and production times.
  • a spider 1 according to the present invention.
  • it comprises three arms 2, 2A and 2B extending from a common central hub 3 associated with the shaft 4.
  • the spider 1 acts as a unit for transmitting the motion generated by the motor (through the drive shaft 4) to the drum, as well as a support for the drum itself.
  • the drum and the spider 1 are secured to each other through fastening screws, for which suitable seats are provided on the free end portion of each arm 2, 2A and 2B.
  • the spider is secured to the perimetric edge of the drum by means of one screw per arm, which screw is substantially perpendicular to the axis of the shaft 4.
  • Fig. 1 the screws are housed in the seats 6, 6A and 6B, which are also visible in Figs. 5 and 6 .
  • the holes 5, 5A and 5B are installation reference holes.
  • the drum C as shown in Fig. 4 , has a cupped edge C1 which is engaged by the screw 7 tightened into the housing seat 6.
  • the housing seat 6 is defined by three perimetric wall portions 16, 26, 36, each extending on a semicylindrical profile for a portion of the respective semicylinder, which are arranged at different heights.
  • each arm is provided with a screw and a respective seat, but more in general the teachings of the present invention are also applicable to two or more seats for a corresponding number of screws.
  • perimetric wall portions 16, 26, 36 are three, but more in general there may be two, four or five of them without departing from the teachings and scope of the present invention.
  • Said perimetric wall portions 16, 26, 36 that define the housing seat 6 are arranged in such a way as to be opposed to each other in an alternate fashion.
  • opposite means herein that there is at least one plane passing through the axis of the cylindrical seat which does not intersects said regions and which separates the cylindrical surface into two semicylindrical surfaces, said portions 16, 26, 36 being arranged in an alternate fashion on said semicylindrical surface;
  • in an alternate fashion means herein that, being said portions arranged at different heights measured along the axis of said cylindrical seat starting from any point of origin, when arranging the portions according to a criterion of increasing height, successive portions will lie on different semicylindrical surfaces.
  • a discontinuous helicoidal path is defined (resulting in a discontinuous thread).
  • the arm 2 is produced by pressing, simply by obtaining the housing seat 6, as will be described below, by tapping the initially unthreaded perimetric wall portions 16, 26, 36.
  • the thread is obtained by using a self-tapping screw 7 which is screwed into the seat 6, thereby removing the necessary chip from the perimetric wall portions 16, 26, 36.
  • the removed chip is easily evacuated because the thread does not follow a continuous helicoidal path, but features interruptions due to the alternation between the perimetric walls 16, 26, 36, which are arranged opposite to each other in at least one section and in an alternate fashion.
  • the seat 6 ends towards the edge C1 with an open countersink 46 which is entered into and seized by the widened head of the screw 7, as shown in Fig. 4 .
  • Fig. 7 there is shown a detail of the step of pressing the free end of the arm 2 of the spider 1.
  • S2 is the matrix of the die and S1 is the punch, and they are made in such a way as to define the housing seat 6 by creating the perimetric wall portions 16, 26, 36 and the open countersink 46.
  • arrows in Fig. 7 also highlight the directions of the main movement, by which the die provided by the matrix S2 and the punch S1 is opened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (6)

  1. Tragstern (1) für mit einer Drehtrommel (C) ausgerüstete Wäschebehandlungsmaschinen, welcher Tragstern (1) mit mehreren Armen (2, 2A, 2B) ausgestattet ist, die von einer gemeinsamen Nabe (4) radial verlaufen, wobei das freie Ende der Arme einen Sitz (6, 6A, 6B) aufweist, der zur Aufnahme einer Schraube (7) zum Verbinden des Tragsterns (1) mit der Trommel (C) und für den Eingriff mit der Trommel (C) ausgelegt ist,
    dadurch gekennzeichnet, dass
    der Aufnahmesitz (6, 6A, 6B) durch Umfangswandteile (16, 26, 36) gebildet ist, die jeweils an einem halbzylindrischen Profil verlaufen und dergestalt angeordnet sind, dass sie in abwechselnder Weise einander gegenüberliegen, wobei die Umfangswandteile (16, 26, 36) einen diskontinuierlichen schraubenlinienförmigen Pfad bilden.
  2. Tragstern (1) nach Anspruch 1, wobei die Umfangswandteile (16, 26, 36) in unterschiedlichen Höhen bezogen auf die Basis eines Zylinders angeordnet sind, der den Sitz (6, 6A, 6B) von innen tangential berührt.
  3. Tragstern (1) nach einem der vorhergehenden Ansprüche, wobei jeder Umfangswandteil (16, 96, 36) sich über annähernd 180° erstreckt.
  4. Tragstern (1) nach einem der vorhergehenden Ansprüche, wobei der Tragstern (1) drei Arme (2, 2A, 2B) aufweist, die von einer mit einer Welle (4) verbundenen gemeinsamen zentralen Nabe (3) ausgehen, und wobei die Achse des Sitzes (6, 6A, 6B) im Wesentlichen senkrecht zu der Welle (4) ist.
  5. Wäschebehandlungsmaschine der Bauart, die mindestens eine Drehtrommel (C) aufweist, welche einen hochstehenden Rand (C1) hat, der für den Eingriff mit einer Schraube (7) ausgelegt ist, die in einem Aufnahmesitz (6, 6A, 6B) eines Tragsterns (1) nach einem oder mehreren der vorhergehenden Ansprüche festgezogen ist.
  6. Verfahren zur Herstellung eines Tragsterns (1) nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es den Schritt der Herstellung der Umfangswandteile (16, 26, 36) durch Pressen aufweist.
EP10744730.2A 2009-07-10 2010-07-05 Tragstern für eine waschmaschinentrommel Not-in-force EP2452006B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000520A ITTO20090520A1 (it) 2009-07-10 2009-07-10 Crociera per macchine per il trattamento di panni provviste di un cesto rotante e metodo di fabbricazione.
PCT/IB2010/053076 WO2011004313A1 (en) 2009-07-10 2010-07-05 Support spider for the drum of a washing machine

Publications (2)

Publication Number Publication Date
EP2452006A1 EP2452006A1 (de) 2012-05-16
EP2452006B1 true EP2452006B1 (de) 2017-08-23

Family

ID=41698074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10744730.2A Not-in-force EP2452006B1 (de) 2009-07-10 2010-07-05 Tragstern für eine waschmaschinentrommel

Country Status (3)

Country Link
EP (1) EP2452006B1 (de)
IT (1) ITTO20090520A1 (de)
WO (1) WO2011004313A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015096926A1 (en) * 2013-12-27 2015-07-02 Arcelik Anonim Sirketi A drum with improved mechanical strength and the production method thereof
CN107938253A (zh) * 2017-12-11 2018-04-20 珠海格力电器股份有限公司 一种洗衣机支架、使用该支架的洗衣机及结构优化方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1460836A1 (de) * 1963-03-22 1969-04-30 Bosch Hausgeraete Gmbh Waschmaschine
DE1918651A1 (de) * 1969-04-12 1971-01-28 Hoesch Ag Tragstern fuer Waschmaschinentrommeln
AU521357B2 (en) * 1977-09-26 1982-04-01 Fisher & Paykel Limited Bowl or tub
DE19532783A1 (de) * 1994-09-06 1996-03-07 Miele & Cie Vorrichtung zur drehbaren Lagerung einer Trommel einer Trommelwaschmaschine mit einem Tragstern
IT1313196B1 (it) * 1999-07-21 2002-06-17 Miramondi Srl Crociera di cestello per lavatrice ad alta velocita' di centrifuga,cestello per lavatrice provvisto della suddetta crociera e
KR101224391B1 (ko) * 2005-12-13 2013-01-22 삼성전자주식회사 드럼 세탁기와 드럼 세탁기 축계의 조립방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2452006A1 (de) 2012-05-16
WO2011004313A1 (en) 2011-01-13
ITTO20090520A1 (it) 2011-01-11

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