EP2682510A1 - A washing machine provided with improved driving unit between pulley and drum shaft - Google Patents

A washing machine provided with improved driving unit between pulley and drum shaft Download PDF

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Publication number
EP2682510A1
EP2682510A1 EP13175058.0A EP13175058A EP2682510A1 EP 2682510 A1 EP2682510 A1 EP 2682510A1 EP 13175058 A EP13175058 A EP 13175058A EP 2682510 A1 EP2682510 A1 EP 2682510A1
Authority
EP
European Patent Office
Prior art keywords
pulley
washer
washing machine
ending pin
ending
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Withdrawn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
EP13175058.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Enrico De Angelis
Carlo Perini
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.)
Vic - Viterie Italia Centrale Srl
Original Assignee
Vic - Viterie Italia Centrale Srl
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 Vic - Viterie Italia Centrale Srl filed Critical Vic - Viterie Italia Centrale Srl
Publication of EP2682510A1 publication Critical patent/EP2682510A1/en
Withdrawn legal-status Critical Current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
    • D06F37/20—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
    • D06F37/30—Driving arrangements 

Definitions

  • the present patent application for industrial invention relates to a washing machine provided with improved driving unit between pulley and drum shaft.
  • washing machines comprise a cylindrical drum that rotates around a horizontal axis inside a tub that can be accessed from the front or the top to load laundry.
  • the drum In order to rotate the drum, the drum is provided on the back with a shaft with horizontal axis adapted to be driven into rotation by a suitable electrical motor mounted on the back of the washing machine.
  • the back end of the drum shaft is inserted into a hole obtained on the tub that houses the drum and then engaged into the hub of a cross fixed on the back wall of the tub.
  • Said drum shaft ends at the front end with an ending pin that is inserted into the hub of a pulley.
  • a driving belt engages the pulley and is actuated by the geared motor of the washing machine to drive the pulley and the drum shaft into rotation.
  • said ending pin of the drum shaft must be provided with two opposite planar sides, as well as a threaded ending section.
  • the pulley hub must be centrally provided with a housing adapted to exactly receive said shaped ending pin of the drum shaft with male-female coupling.
  • the next operation to be carried out from the outside of the pulley is the screwing of a nut that is engaged into said threaded ending section of the ending pin of the drum shaft. After completing said coupling between nut and pin, the nut is rigidly engaged against the external side of the pulley hub, thus firmly locking the pulley on the drum shaft.
  • the first problem with pulleys made of press-bent plate is the impossibility to use an ordinary nut to tighten the pulley on the shaft. As a matter of fact, although screwed until the end of its travel, the nut cannot tighten the pulley hub because of the low thickness of the press-bent plate pulley.
  • Fig. 1 shows the driving unit provided with said special nut.
  • the washing machine comprises a shaft (A) with end provide with ending pin (1).
  • the ending pin (1) comprises:
  • the nut (4) is provided with a bell-shaped flange (4a) protruding towards the pulley (3) and adapted to tighten the pulley (3) against the side of the inner ring (2a) of the bearing (2).
  • the nut (4) In order for such a coupling to work, the nut (4) must be tightened with very high torque values in order to prevent the pulley (3) from slipping against the inner ring (2a) of the bearing (2).
  • the hard smooth surface of the bearing rings does not favor the frictional grip of the pulley (3) on the inner ring (2a) of the bearing.
  • the contact surface between pulley (3) and inner ring (2a) of the bearing (2) is reduced, basically consisting in a narrow annular crown.
  • said hole sheared on the pulley must be provided with a diametrically opposite pair of rectilinear parallel sections, adapted to be exactly conjugated with an opposite pair of planar sides obtained on the intermediate section (1b) of the ending pin (1) of the shaft (A).
  • DE10052586 discloses a front-loading washing machine comprising a drum shaft supported by axially spaced radial bearings connected to the shaft. More precisely, the shaft is provided with a first end connected to the drum and provided with a pin whereon radial bearings are revolvingly mounted, and with a second end provided with an axially adjustable tightening screw for cooperating with a spring.
  • the purpose of the present invention is to remedy the aforesaid drawbacks, providing an inexpensive effective realization of the driving unit between pulley and shaft of washing machine drums when said pulley is made of press-bent plate.
  • Another purpose of the invention is to achieve the aforementioned object without making any modification of the ending pin of the drum shaft and without using special expensive nuts or tightening bolts.
  • the washing machine of the invention comprises:
  • Said washer (5) has a total height measured according to a parallel direction to the longitudinal axis of the shaft such that said screw tightening means interfere with the pulley before they reach the end of their screwing travel along the distal section of the ending pin.
  • the peculiarity of the washing machine of the invention consists in the fact that the pulley is made of press-bent plate and the washer has an anti-rotational profile, in correspondence of its hole, that can be conjugated with an anti-rotational profile obtained on an intermediate section of the ending pin between the proximal section and the distal section of the ending pin.
  • the washing machine of the invention comprises a drum (not shown) and a shaft (A) provided with a first end whereon the drum is mounted, and a second end provided with ending pin (1).
  • the washing machine comprises a bearing (2) mounted on the ending pin, a pulley (3) coupled with the ending pin and a driving unit disposed between pulley (3) and shaft (A).
  • the driving unit comprises a washer (5) mounted on the ending pin and disposed between bearing (2) and pulley (3).
  • the pulley (3) has a hub mounted on said ending pin (1) of the shaft.
  • the bearing (2) is coupled with a proximal section (1a) of the ending pin (1) and the washer (5) is provided with a hole (5c) engaged by the ending pin (1).
  • said washer (5) is of cup type.
  • the driving unit of the washing machine also comprises screw tightening means (40; 60) (see Fig. 5 and 7 ) coupled with a distal section (1c; 1c') of the ending pin (1) of the shaft and adapted to tighten the hub of the pulley (3) on the ending pin (1).
  • the washer (5) has a total height (H) measured according to a parallel direction to the longitudinal axis of the shaft (A) such that said screw tightening means (40; 60) interfere with the pulley (3) before they reach the end of their screwing travel along the distal section (1c; 1c') of the ending pin (1).
  • the peculiarity of the washing machine of the invention consists in the fact that the pulley (3) is made of press-bent plate.
  • the thickness of said plate is 1.0-1.5 mm.
  • the washer (5) has an anti-rotational profile (5a) in correspondence of the hole (5c).
  • the ending pin (1) of the drum shaft is provided with an intermediate section (1b) between the proximal section (1a) and the distal section (1c).
  • the intermediate section (1b) has an anti-rotational profile (6) complementary to the anti-rotational profile (5a) of the washer.
  • the anti-rotational profile (5a) of the washer can be conjugated with the anti-rotational profile (6) of the ending pin (1).
  • the anti-rotational profile (5a) of the washer (5) advantageously comprises a diametrically opposite pair of rectilinear parallel sections (5a) obtained in the hole (5c) of the washer.
  • the anti-rotational profile (6) of the intermediate section of the ending pin (1) comprises an opposite pair of planar sides (6) obtained on said intermediate section (1b) of the ending pin (1) and adapted to be conjugated with the rectilinear parallel sections (5a) obtained in said hole (5c) of the washer.
  • the screw tightening means (40) of the driving unit comprise a nut (40) and the distal section (1c) of the ending pin (1) is externally threaded, so that the nut (40) can be screwed onto said distal section (1c) of the ending pin to tighten the hub of the pulley (3) against the washer (5).
  • the washer (5) is provided with surface (5b) facing towards the nut (40).
  • the surface (5b) has an advantageously serrated anti-slip profile that guarantees a perfectly stable grip against the surface of the pulley (3) when the nut (40) is tightened against the hub of the pulley (3).
  • the serrated profile can be replaced with any other type of anti-slip surface, such as a beveled or high-roughness surface.
  • the motion of the pulley (3) is transmitted to the ending pin (1) of the shaft by means of safe, reliable frictional coupling that avoids the need for the anti-rotational shaping of the hub of the pulley (3).
  • the hub of the pulley is provided with an ordinary circular hole (30) adapted to be coupled with the distal section (1c) of the ending pin (1), as shown in Fig. 7 .
  • the contact surface between pulley (3) and washer (5) is higher than the contact surface between pulley (3) and inner ring (2a) of the bearing of a washing machine according to the prior art, as shown in Fig. 1 .
  • Fig. 5 illustrates a second embodiment of the washing machine of the present invention, wherein said screw tightening means comprise a tightening bolt (60) with head (60b) and stem (60a).
  • the distal section (1c') of the ending pin is provided with a threaded axial hole (F), into which the stem (60a) of the tightening bolt (60) is screwed, in such manner that the head (60b) of the tightening bolt tightens the pulley (3) against said washer (5).
  • the washer (5) In addition to acting as spacer between the hub of the pulley (3) and the bearing (2), the washer (5) also prevents the loosening of the nut (40) or tightening bolt (60).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP13175058.0A 2012-07-06 2013-07-04 A washing machine provided with improved driving unit between pulley and drum shaft Withdrawn EP2682510A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000080A ITAN20120080A1 (it) 2012-07-06 2012-07-06 Lavabiancheria corredata di un gruppo di trasmissione perfezionato fra la puleggia e l'albero del cestello.

Publications (1)

Publication Number Publication Date
EP2682510A1 true EP2682510A1 (en) 2014-01-08

Family

ID=46845798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13175058.0A Withdrawn EP2682510A1 (en) 2012-07-06 2013-07-04 A washing machine provided with improved driving unit between pulley and drum shaft

Country Status (2)

Country Link
EP (1) EP2682510A1 (it)
IT (1) ITAN20120080A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018103959A1 (en) * 2016-12-07 2018-06-14 Arcelik Anonim Sirketi A washing machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB912439A (en) * 1959-12-24 1962-12-05 Clamar S A Improvements in and relating to washing machines
US3199318A (en) * 1963-02-20 1965-08-10 Eugene B Sullivan Cleaning machine and seal means therefor
FR2479864A1 (fr) * 1980-04-02 1981-10-09 Mayc Sa Dispositif de montage perfectionne dans une machine a laver le linge
DE10052586C1 (de) * 2000-10-24 2001-12-13 Miele & Cie Wäschebehandlungsmaschine mit einer fliegend gelagerten Trommel
US20120063864A1 (en) * 2010-09-14 2012-03-15 Spinal Simplicity Llc Ratchet locking mechanism for threaded fastener

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB912439A (en) * 1959-12-24 1962-12-05 Clamar S A Improvements in and relating to washing machines
US3199318A (en) * 1963-02-20 1965-08-10 Eugene B Sullivan Cleaning machine and seal means therefor
FR2479864A1 (fr) * 1980-04-02 1981-10-09 Mayc Sa Dispositif de montage perfectionne dans une machine a laver le linge
DE10052586C1 (de) * 2000-10-24 2001-12-13 Miele & Cie Wäschebehandlungsmaschine mit einer fliegend gelagerten Trommel
US20120063864A1 (en) * 2010-09-14 2012-03-15 Spinal Simplicity Llc Ratchet locking mechanism for threaded fastener

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018103959A1 (en) * 2016-12-07 2018-06-14 Arcelik Anonim Sirketi A washing machine

Also Published As

Publication number Publication date
ITAN20120080A1 (it) 2014-01-07

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