EP2177658A1 - Trommel und Waschmaschine mit einer Trommel - Google Patents

Trommel und Waschmaschine mit einer Trommel Download PDF

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Publication number
EP2177658A1
EP2177658A1 EP08380294A EP08380294A EP2177658A1 EP 2177658 A1 EP2177658 A1 EP 2177658A1 EP 08380294 A EP08380294 A EP 08380294A EP 08380294 A EP08380294 A EP 08380294A EP 2177658 A1 EP2177658 A1 EP 2177658A1
Authority
EP
European Patent Office
Prior art keywords
pulley
vane
shaft
tub
drum
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Withdrawn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
EP08380294A
Other languages
English (en)
French (fr)
Inventor
Salvador Aparicio Gracia
Miguel Javier Caparrós Ezpeleta
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.)
BSH Electrodomesticos Espana SA
Original Assignee
BSH Electrodomesticos Espana SA
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 BSH Electrodomesticos Espana SA filed Critical BSH Electrodomesticos Espana SA
Priority to EP08380294A priority Critical patent/EP2177658A1/de
Priority to ES200930572A priority patent/ES2377634B1/es
Publication of EP2177658A1 publication Critical patent/EP2177658A1/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Withdrawn legal-status Critical Current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
    • D06F37/30—Driving arrangements 

Definitions

  • the invention relates to a pulley, in particular for use with a household appliance, a washing machine comprising a pivoted drum for holding clothes wherein the drum is positioned within a tub, the drum being functionally connected to a shaft that passes through a bearing of the tub, wherein a pulley is fixed to the shaft outside the tub, and to a method for cooling a region in the vicinity of a shaft fitted with a pulley.
  • Modern washing machines comprise a pivoted drum for holding clothes wherein the drum is positioned within a tub ('drum housing').
  • the drum is typically connected to a shaft that leads through the tub.
  • the tub is equipped with a respective ball bearing to support the shaft. While the bearing is made of metal, most often steel, the remainder of the tub is made of plastic.
  • the shaft is typically provided with a pulley to connect the shaft to a motor via a belt. Upon operation of the motor, the pulley, via the belt, exerts a torque onto the shaft to rotate the drum.
  • a typical revolution speed is within a range from 600 rpm to 1400 rpm.
  • WO 2007/115894 A1 discloses a tub for a clothes washing-machine, in particular of the domestic type, which houses a rotating drum within which the washing load is placed, said washing tub consisting of a peripheral cylindrical housing formed by a tub front section and a tub rear section which are joined at their respective plastic material edges, enclosing the drum in their interior.
  • the tub rear section holds a respective ball bearing to support a shaft.
  • a critical zone is the joint between the plastic material of the tub and the bearing, in particular a bearing housing.
  • the plastic cover may have been formed around the bearing by injection moulding.
  • the bearing heats up so that thermal expansion and contraction of the bearing and the surrounding plastic occurs in different magnitude. This may lead to damage of the plastic and / or of the interface between metal and plastic, mainly because of the induced stress and subsequent delamination along the interface. This in turn may render the washing machine unusable.
  • the pulley comprises at least one vane.
  • the pulley upon rotation, creates an air flow that may be directed to a heated zone, in particular to a bearing.
  • the design of such a pulley is inexpensive compared to using an oversized bearing or reinforced plastic or the use of a separate fan fixed to the shaft. This object is further achieved without a need to re-design, in particular a need for an enlarged design dimension.
  • the pulley (which transmits torque to the shaft and which is a passive transmission element), by means of a vane / vanes, generates an air-cooling effect upon rotation.
  • the pulley comprises a plurality of vanes to increase air flow.
  • the plurality of vanes is provided around the pulley's rotational axis to create an even air flow.
  • the vanes may be located as it is most useful for the intended purpose.
  • the plurality of vanes is arranged in a rotational symmetry around the pulley's rotational axis.
  • the vane may be of any useful shape.
  • a vane has a substantially triangular shape for easy manufacturing while creating a relatively strong air flow with low or no propeller noise.
  • a number of vanes is between 8 and 24.
  • the pulley may be made from a plastic material.
  • the pulley is made by injection moulding.
  • the pulley's plastic material comprises a plastic base and reinforcement filler, e. g. talc and / or fibre (glass fibre, ceramic fibre etc.).
  • a plastic base and reinforcement filler e. g. talc and / or fibre (glass fibre, ceramic fibre etc.).
  • the pulley may be made from metal sheet.
  • At least one vane is formed by sheet metal forming of the pulley, in particular by partial cutting and subsequent bending the cut area out of its original position.
  • the at least one vane is designed to create a flow of air along a rotational axis of the pulley upon operation / rotation of the pulley.
  • This airflow is particularly useful for cooling down a bearing supporting a shaft that is fixed to the pulley.
  • the washing machine (including one out of a single washing machine and a washer-dryer) comprises a pivoted drum for holding clothes wherein the drum is positioned within a tub, the drum being functionally connected (i. e., directly connected or via intermediate elements) to a shaft that passes through a bearing, preferably ball bearing, of the tub.
  • a pulley is directly or indirectly (e. g., via a bushing) fixed to the shaft outside the tub.
  • the pulley comprises at least one vane to create, upon rotation, a flow of air to or from the bearing.
  • the advantages stem from the utilization of a passive element (the pulley) as a cooling element to cool the bearings and the joint plastic / metal (cast shell) zone while retaining its function of torque transmission.
  • a passive element the pulley
  • bearings may be employed without concern for heat generation.
  • plastic materials may be employed without a requirement for fibre or mineral fillers for temperature resistance; this is particularly attractive since the drum is mostly made from one mould.
  • the pulley upon rotation, creates a flow of air to the bearing.
  • the pulley thus acts as an air-compression element that draws air from the exterior and forces it towards the tub/bearings zone.
  • the pulley upon rotation, creates a flow of air from the bearing.
  • the pulley thus acts as a low pressure-generating element that draws air from the tub / bearings zone such that cool air flows in through the sides towards the bearings zone.
  • the pulley is a pulley as described above.
  • the washing machine thus comprises a pulley which transmits torque to the drum (currently a passive transmission element) such that by means of a vanes / vanes an air-cooling effect is generated particularly in the spinning phases.
  • the pulleys are not restricted for use in a washing machine or any other household appliance but may also be utilized in any other type of apparatus comprising a shaft. They are particularly useful for cooling a bearing of the shaft and especially for cooling a joint bearing / surrounding material zone wherein the surrounding material may or may not be plastic.
  • the method for cooling a region in the vicinity of a shaft fitted with a pulley, wherein the pulley comprises at least one vane comprises the step of rotating the shaft pulley to create a flow of air by the at least one vane.
  • the flow of air is created substantially along a rotational axis of the pulley.
  • the region to be cooled comprises a bearing supporting the shaft.
  • the shaft drives a drum of a clothes washing machine.
  • FIG 1 shows a schematic section of a tub 1 for a clothes washing-machine, in particular of a domestic type, which houses a rotating drum 2 within which the washing load is placed.
  • the washing-machine is of the front-loading type, with an opening 10 in the tub front section 3 for the insertion of the washing load.
  • the tub 1 is manufactured from plastic by injection moulding and comprises a peripheral cylindrical housing made from two parts, a tub front section 3 and a tub rear section 4 which are joined along their respective open edges 31, 41, enclosing the drum 2 in their interior, by means of fusion welding of the plastic materials of the edges 31, 41, producing a weld bead 5a between the tub front section 3 and the tub rear section 4.
  • the system for closing the same by welding is the system of closure by vibration.
  • the edges 31, 41 are joined along at least two joining lines 51, 52, forming a chamber 5 between the edges 31, 41 along the perimeter of the weld bead 5a.
  • the washing machine further comprises a motor 10. A rotation of a driveshaft 11 of the motor 10 is transmitted to the pulley 9 by a belt 12.
  • the driving mechanism 6,7,9-12 is also referred to as a drive train to rotate the drum 2.
  • FIG 2 shows a wheel-like pulley 9 having a through hole 13 for inserting a shaft directly or, e. g., via a bushing.
  • the pulley 9 guides the belt and may comprise a groove between two flanges, as it is well known in the art.
  • the pulley further comprises twelve air guiding means each in turn comprising an opening 15 that is at least partly overlapped (if seen from the front or rear) by a vane 16.
  • the vane 16 and the opening 15 have the same form of an isosceles triangular with perpendicular bisector of the smaller side roughly aligned in the radial direction.
  • One of the longer sides connects the vane 12 to the rest of the pulley 9. If the pulley 9 is driven by the belt, it rotates with the shaft around the rotation axis R.
  • the pulley 9 is made from plastic material, in particular comprising PP.
  • FIG 3 shows a pulley 17 that in comparison to the embodiment of FIG 2 has larger openings 15 and vanes 17.
  • a rotation of the pulley 9 or 17 causes cooling air 18 to be drawn through the openings 15 such that an air flow is created that is substantially directed along the rotation axis R (from front to rear in the view of FIG 2 and FIG 3 ).
  • FIG 4 shows an embodiment of the drive train wherein the pulley 9 or 17 is adapted and arranged such that the bearing 6 is located in the direction of the blown out air 18 (the air flow along the rotation axis R). Subsequently, the air flow 18 cools the bearing and its surrounding by being frontally directed onto the zone to be cooled.
  • FIG 5 shows another embodiment of the drive train wherein the pulley 9 or 17 is adapted and arranged such that the bearing 6 is located at the side of the pulley 9,17 where air 18 is drawn in.
  • the drawn-in air flow 18 cools the bearing 6 and its surrounding by being moved substantially along the surface of the zone to be cooled.
  • a short distance from the pulley 9,17 to the area to be cooled is advantageous.
  • the pulley may be used within other types of machines.
  • the pulley may be made from another plastic base material than PP, e. g., PEEK.
  • the pulley may contain an appropriate amount of reinforcement fillers, e. g. glass fibers of 15 vol % to 30 vol %.
  • the pulley may also be made from metal, e. g., steel.
  • the vane may have different form and positions, e. g., different opening angles.
  • the connection to the shaft (or the bushing) may be of any type, e. g., welding, gluing, screwing, clamping etc.
  • the air flow does not have to be parallel to the shaft supporting the pulley but may - depending on, e. g., the form and position of the vane - be blown in or drawn from a direction that comprises a finite angle with the rotation axis.
EP08380294A 2008-10-14 2008-10-14 Trommel und Waschmaschine mit einer Trommel Withdrawn EP2177658A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08380294A EP2177658A1 (de) 2008-10-14 2008-10-14 Trommel und Waschmaschine mit einer Trommel
ES200930572A ES2377634B1 (es) 2008-10-14 2009-08-07 Polea y máquina lavadora con una polea.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08380294A EP2177658A1 (de) 2008-10-14 2008-10-14 Trommel und Waschmaschine mit einer Trommel

Publications (1)

Publication Number Publication Date
EP2177658A1 true EP2177658A1 (de) 2010-04-21

Family

ID=40405158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08380294A Withdrawn EP2177658A1 (de) 2008-10-14 2008-10-14 Trommel und Waschmaschine mit einer Trommel

Country Status (2)

Country Link
EP (1) EP2177658A1 (de)
ES (1) ES2377634B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8042285B2 (en) * 2007-08-22 2011-10-25 Miele & Cie. Kg Laundry dryer with a holding device
WO2013038432A1 (en) * 2011-09-13 2013-03-21 Meccanica Generale S.R.L. A plastic pulley for driving drum for washing machine into rotation.
CN106958118A (zh) * 2016-01-12 2017-07-18 无锡小天鹅股份有限公司 用于洗衣机的皮带轮和洗衣机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB892609A (en) * 1959-02-11 1962-03-28 Novi Sa Improvements in or relating to variable-speed gears
US4982705A (en) * 1990-02-21 1991-01-08 Tecumseh Products Company Cam pulley and cylinder head arrangement for an overhead cam engine
DE4241804A1 (de) * 1992-12-11 1994-06-16 Licentia Gmbh Tandemlüfter für Kraftfahrzeuge
WO2007107512A2 (en) * 2006-03-17 2007-09-27 Arcelik Anonim Sirketi A washer/dryer
WO2007115894A1 (en) 2006-04-12 2007-10-18 BSH Bosch und Siemens Hausgeräte GmbH Tub for washing machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920010403B1 (ko) * 1990-11-15 1992-11-27 삼성전자 주식회사 전자동 세탁기의 변속기 냉각장치
KR100539596B1 (ko) * 2003-06-04 2005-12-29 삼성전자주식회사 세탁기용 모터풀리 및 그 제조방법
KR101141639B1 (ko) * 2004-11-16 2012-06-14 엘지전자 주식회사 직결식 세탁기용 모터의 아웃터로터
KR100851904B1 (ko) * 2007-04-03 2008-08-13 삼성전자주식회사 모터풀리와 이를 구비한 세탁기

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB892609A (en) * 1959-02-11 1962-03-28 Novi Sa Improvements in or relating to variable-speed gears
US4982705A (en) * 1990-02-21 1991-01-08 Tecumseh Products Company Cam pulley and cylinder head arrangement for an overhead cam engine
DE4241804A1 (de) * 1992-12-11 1994-06-16 Licentia Gmbh Tandemlüfter für Kraftfahrzeuge
WO2007107512A2 (en) * 2006-03-17 2007-09-27 Arcelik Anonim Sirketi A washer/dryer
WO2007115894A1 (en) 2006-04-12 2007-10-18 BSH Bosch und Siemens Hausgeräte GmbH Tub for washing machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8042285B2 (en) * 2007-08-22 2011-10-25 Miele & Cie. Kg Laundry dryer with a holding device
WO2013038432A1 (en) * 2011-09-13 2013-03-21 Meccanica Generale S.R.L. A plastic pulley for driving drum for washing machine into rotation.
US9085846B2 (en) 2011-09-13 2015-07-21 Meccanica Generale—S.R.L. Plastic pulley for driving drum for washing machine into rotation
RU2573342C2 (ru) * 2011-09-13 2016-01-20 Мекканика Дженерале-С.Р.Л. Пластмассовый шкив для приведения во вращение барабана стиральной машины
CN106958118A (zh) * 2016-01-12 2017-07-18 无锡小天鹅股份有限公司 用于洗衣机的皮带轮和洗衣机
CN106958118B (zh) * 2016-01-12 2023-09-22 无锡小天鹅电器有限公司 用于洗衣机的皮带轮和洗衣机

Also Published As

Publication number Publication date
ES2377634B1 (es) 2013-02-08
ES2377634A1 (es) 2012-03-29

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