US20040231372A1 - Damper for washing machine - Google Patents

Damper for washing machine Download PDF

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Publication number
US20040231372A1
US20040231372A1 US10/828,204 US82820404A US2004231372A1 US 20040231372 A1 US20040231372 A1 US 20040231372A1 US 82820404 A US82820404 A US 82820404A US 2004231372 A1 US2004231372 A1 US 2004231372A1
Authority
US
United States
Prior art keywords
rod
pad holder
damper
rotation
cylinder
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.)
Abandoned
Application number
US10/828,204
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English (en)
Inventor
Joon Kim
Dong Kim
Young Kim
Ki Woo
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, JOON WOO, KIM, DONG WON, KIM, YOUNG HO, WOO, KI CHUL
Publication of US20040231372A1 publication Critical patent/US20040231372A1/en
Abandoned 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
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal 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
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • 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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/12—Casings; Tubs
    • D06F39/125—Supporting arrangements for the casing, e.g. rollers or legs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F16F7/09—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other in dampers of the cylinder-and-piston type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present invention relates to a damper for a washing machine, and more particularly, to a damper that is designed to exert a multiple stages of damping force in response to an amount of vibration generated in the washing machine to properly attenuate the vibration, small and large, thereby stably operating the washing machine under a low noise state. Further, the present invention is directed to a multiple-stage damper that can perform a sufficient role as the damper with respect to the vibration due to conical rotation generated during the operation of the washing machine.
  • washing machines are classified according to washing method into a drum type, an agitator type, and a pulsator type.
  • the drum type washing machine has a rotational drum provided at an inner wall with a protruded member, being designed to perform washing using physical impact generated when the laundry ascended by the protruded portion along an inner circumference of the drum drops.
  • a drum type washing machine has been widely used as a household washing machine as it has advantages of reducing the damage of the laundry and saving water.
  • the pulsator type washing machine includes an upright drum having an opened top and a pulsator installed on an inner bottom of the drum.
  • the pulsator type washing machine is designed to perform washing using rotational force of the pulsator or the drum.
  • the agitator type washing machine includes an upright drum having an opened top and an agitator installed in the drum, thereby performing washing using forced water flow generated by the rotation of the agitator.
  • the washing machines may be further classified according to various ways. For example, they can be classified according to laundry loading method into a front-loading type where the laundry is loaded through the front, a top-loading type where the laundry is loaded through the top, and a side-loading type where the laundry is loaded through the side.
  • all of the washing machines have a motor and a movable part rotated by the motor.
  • vibration is generated in the washing machine, causing noise and abnormal operation of the washing machine.
  • the vibration may cause a variety of problems such as a walking phenomenon where an installed location of the washing machine is displaced and an RPM reduction problem of the movable part by a frictional force due to collision between the movable part and a stationary part. Therefore, the washing machine manufactures have aspired to develop a method and system that can attenuate the vibration generated when the washing machine is operated.
  • the conventional washing machine has employed a one-stage damper having a fixed damping constant to attenuate the vibration. That is, regardless of the operation state of the washing machine, a fixed damping constant is applied to the movable part. However, since the vibration generated in the movable part is varied at every stroke of the washing machine, it is not preferable that the fixed damping constant is applied to the movable part.
  • the operation of the washing machine is done going through a small vibration section and a large vibration section.
  • a small vibration section such as an initial stage of a dewatering cycle where the RPM of the movable part is varied
  • a relatively large vibration is generated in a relatively large vibration.
  • a relatively small vibration is generated in a steady RPM section where the RPM of the movable part is not varied.
  • the damping constant of the damper is not linearly varied. That is, since the damping constant of the damper is varied by a predetermined step, the vibration variably generated in the movable part cannot be quickly attenuated.
  • the conventional damper since the conventional damper is designed to exert the damping force thereof only in a longitudinal direction thereof but not to exert the damping force with respect to the conical rotation, it has a weak damping force. Especially, in case where the damping on the conical rotation is not performed, the walking phenomenon occurs apparently while the washing machine body rocks from side to side. Of course, this rock of the washing machine causes a large noise.
  • the present invention is directed to a damper for a washing machine that substantially obviates one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a damper for a washing machine that can attenuate the vibration regardless of other vibration amount generated in the washing machine.
  • Another object of the present invention is to provide a damper for a washing machine that can attenuate other vibration not one dimensional motion generated in the washing machine.
  • a further object of the present invention is to provide a damper for a washing machine in which the vibration is properly attenuated to thereby increase the user's pleasantness and allow the stable operation of the washing.
  • a damper for a washing machine comprising: a cylinder; a rod of which one end is inserted in the cylinder; a sliding rod further extending from the inserted end of the rod; a pad holder slidably installed apart from and on an outer side of the sliding rod; a damping pad formed on an outer circumference of the pad holder and being in contact with an inner circumference of the cylinder; and a rotation-preventing part for preventing a relative rotation between the pad holder and the rod.
  • a damper for a washing machine comprising: a cylinder fixed to a case of the washing machine and one side of a tub; a rod fixed to the case and the other side of the tub and folded with the cylinder; a sliding rod further extending from the rod; a pad holder spaced away from the sliding rod; a damping pad interposed into a contact surface between the pad holder and the cylinder; and a rotation-preventing part for preventing a relative rotation between the pad holder and the rod.
  • a damper for a washing machine comprising: a cylinder; a rod of which one end is inserted in the cylinder; a pad holder slidably installed apart from and on an outer side of the rod; a damping pad formed on an outer circumference of the pad holder and being in contact with an inner circumference of the cylinder; and a rotation-preventing part formed on a contact position between the rod and the pad holder, for preventing a relative rotation between the pad holder and the rod.
  • a damper for a washing machine comprising: a cylinder; a rod of which one end is inserted in the cylinder; a sliding rod extending from the rod; a pad holder slidably installed apart from and on an outer side of the rod; a damping pad formed on an outer circumference of the pad holder and being in contact with an inner circumference of the cylinder; and a rotation-preventing part of which one end is fixed to both sides of the pad holder and the other end is fixed to the rod and the sliding rod, for preventing a relative rotation between the pad holder and the rod.
  • a damper for a washing machine comprising: a cylinder; a rod inserted in the cylinder; a damping pad formed on an outer circumference of the rod; and a rotation-preventing part for preventing a relative rotation between the pad holder and the rod.
  • FIG. 1 is a perspective view of a drum type washing machine where a damper according to a first embodiment of the present invention is employed;
  • FIG. 2 is a sectional view of the damper depicted in FIG. 1;
  • FIG. 3 is a sectional view taken along the line A-A′ of FIG. 2;
  • FIG. 4 is a sectional view of a damper according to a first embodiment, illustrating a damping operation for attenuating transient vibration of a drum when a washing machine is in an initial dewatering operation;
  • FIG. 5 is a sectional view of a damper according to a first embodiment, illustrating a damping operation for attenuating relatively small vibration of a drum when a washing machine is in a steady dewatering operation;
  • FIG. 6 is a sectional view of a damper according to a first embodiment, illustrating a damper operation where conical vibration is attenuated by the damper;
  • FIG. 7 is a sectional view of a damper according to a second embodiment of the present invention.
  • FIG. 8 is a sectional view of a damper according to a second embodiment, illustrating a damping operation where conical vibration is attenuated by the damper.
  • a drum type washing machine is exemplified.
  • the present invention is not limited to the drum type washing machine.
  • the present invention can be applied to a variety of devices generating vibration as well as other types of the washing machine.
  • FIG. 1 shows a perspective view of a drum type washing machine where a damper according to a first embodiment of the present invention is employed.
  • a drum type washing machine includes a case 3 , a tub 1 disposed in the case 3 to storing water, a drum 2 disposed in the tub 1 to receive the laundry, and a driving motor 10 disposed on a rear side of the tub 1 to rotate the drum 2 .
  • Rotational force of the driving motor 10 is transmitted to the drum 2 via a belt 11 .
  • the drum 2 rotates, the laundry loaded in the drum 2 rotates together with the drum 2 .
  • the drum 2 rotates with a relatively low RPM, the laundry ascends by the rotation of the drum and drops by a gravity to collide with the water contained in the tub 1 .
  • the driving force of the driving motor 10 is transmitted to the drum via the belt 11 in this embodiment, it will be apparent that the driving motor 10 may be designed to be directly coupled to the drum 2 and thereby as the driving motor 10 rotates, the drum 2 rotates.
  • the drum 2 rotates and thereby vibration is generated.
  • the vibration is generated in a conical direction as well as in one-dimensional direction.
  • the present invention is interested in attenuating the vibration generated in the conical direction.
  • the washing machine further includes a weight 4 disposed on an outer circumference of the tub 1 to correct the center of gravity of the tube 1 in all directions, a spring 5 having opposite ends respectively connected to the case 3 and the tub 1 to alleviate vibration generated from both the tub 1 and the drum 2 , and a damper 8 having opposite ends respectively connected to the case 3 and the tub 1 to attenuate vibration generated in the tub 1 .
  • the weight 4 is designed to correct the center of gravity of the tub 1 to radically alleviate the vibration that may be generated by the eccentric center of gravity of the tub 1 .
  • the vibration generated by the operation of the tub 1 is first absorbed by the spring 5 and is then attenuated by the damper 8 . As a result, the vibration generated by the operation of the tube 1 can be quickly removed.
  • the damper includes a cylinder 161 of which one end is fixed to the tub 1 , and a rod 162 of which one end is fixed to the case 3 and inserted into the cylinder 161 .
  • the damper 8 may be constructed such that the rod 162 is connected to the tub 1 and the cylinder is connected to the case 3 .
  • the cylinder 161 and the rod 162 are connected as above, such a change does not fail to embody the present invention.
  • a damping pad is inserted between the rod 162 and the cylinder 161 inserted into the rod 162 , and is in contact with an inner circumference of the cylinder 161 .
  • damping is performed by a frictional force between the inner circumference of the cylinder 161 and the damping pad (see numeral 170 of FIG. 2).
  • the damper 8 can perform the damping operation even with respect to the conical rotation as well as with respect to the translational displacement.
  • FIG. 2 shows a sectional view of the damper according to a first embodiment of the present invention
  • FIG. 3 shows a sectional view taken along the line A-A′ of FIG. 2.
  • the damper 8 includes a hollow cylinder 161 , a rod 162 of which one end is inserted in the cylinder 161 , a sliding rod 166 integrally formed on an end of the rod 162 , a pad holder 164 slidably installed apart from and on an outer circumference of the sliding rod 166 , a damping pad 163 formed on an outer circumference of the pad holder and allowing a damping force to act on through a frictional action with the inner circumference of the cylinder 161 , and a rotation-preventing part 180 for restraining a relative rotation between the pad holder and the rod.
  • the damper 8 further includes a spring 165 disposed on both sides of the pad holder 164 , for supporting the pad holder 164 and the sliding rod 166 .
  • the rotation-preventing part 180 is provided with a protrusion 167 formed protruding inwardly from the inner circumference of the pad holder in the length direction, and a groove 168 formed on an outer circumference of the sliding rod 166 so as to correspond to the protrusion 167 .
  • the groove 168 is shaped in a key groove, and may be formed one or more.
  • the groove 168 can be formed in the form of a plurality of splines.
  • the protrusion 167 is formed in the shape of a key and can be alternatively formed one or more on the inner circumference of the pad holder 164 such that the protrusion 167 is correspondingly inserted into the groove 168 .
  • the protrusion 167 may be formed in the form of a plurality of splines such that the protrusion 167 is correspondingly inserted into the groove 168 formed in the structure of the splines on the outer circumference of the sliding rod 166 .
  • serration is formed unlike the spline, the same operation can be obtained.
  • the rotation-preventing part 180 is configured to include a protrusion formed protruding from the outer circumference of the sliding rod 166 in the length direction, and a groove formed on the inner circumference of the pad holder 164 in the length direction with shape and structure corresponding to the protrusion.
  • the damper 8 can attenuate a transient vibration of the drum 2 in an initial dewatering operation and a small vibration of the drum 2 in a steady operation by using a translational displacement acting on the damper 8 in the axial direction thereof. Also, the conical vibration generated when the drum 2 rotates conically can be attenuated by a damping force through the torsion action of the damper 8 .
  • the rotation-preventing part 180 is formed such that the damper 8 performs the torsion action.
  • FIG. 4 illustrates a damping operation for attenuating transient vibration of the drum when the washing machine is in the initial dewatering operation
  • FIG. 5 illustrates a damping operation for attenuating relatively small vibration of a drum when a washing machine is in a steady dewatering operation.
  • a damping force can act between an outer circumference of the sliding rod 166 and an inner circumference of the pad holder 164 . So as the damping force to exceed a predetermined value, a predetermined damping member (not shown) can be inserted between the sliding rod 166 and the pad holder 164 .
  • FIG. 6 is a sectional view of a damper according to a first embodiment, illustrating a damper operation where conical vibration is attenuated by the damper.
  • the protrusion 167 of the pad holder 164 is inserted into the groove 168 of the sliding rod 166 , and the pad holder 164 is rotatable only integrally with the sliding rod 166 .
  • the rod rotates 162 the pad holder 164 and the damping pad 163 rotate too.
  • a frictional force is generated between the damping pad 163 and the inner circumference of the cylinder 161 , so that the conical vibration can be attenuated.
  • FIG. 7 is a sectional view of a damper according to a second embodiment of the present invention
  • FIG. 8 is a sectional view illustrating a damping operation.
  • a damper 8 of this embodiment is configured to include a hollow cylinder 261 , a rod 262 of which one end is inserted in the cylinder 261 , a sliding rod 267 integrally formed on an end of the rod 262 , a pad holder 264 slidably installed apart from and on an outer side of the sliding rod 267 , a damping pad 263 formed on an outer circumference of the pad holder 264 and allowing a friction force to act on through the friction with the inner circumference of the cylinder 261 , and first and second springs 265 and 266 respectively coupled between the pad holder 264 and the rod 262 and between the pad holder 263 and the sliding rod 267 .
  • the first and second springs 265 and 266 allow a relative rotation between the pad holder 264 and the sliding rod 267 to be constrained, and thereby function as a rotation-preventing part 280 .
  • each of the first and second springs 265 and 266 has spring coupling protrusions 269 , 274 , 271 and 272 formed at their respective both ends such that they are coupled between the pad holder 264 and the rod 262 and between the pad holder 264 and the sliding rod 267 .
  • spring coupling grooves 275 , 268 , 273 and 270 are respectively formed at predetermined positions of the pad holder 264 and the rod 262 , and at predetermined positions of the pad holder 264 and the sliding rod 267 so that the spring coupling protrusions 269 , 274 , 271 and 272 can be inserted into and fixed to the spring coupling grooves 275 , 268 , 273 and 270 .
  • the one side coupling protrusion 269 of the first spring 265 and the other side coupling protrusion 272 are arranged at a cross angle and are inserted into and fixed to the pad holder 264 .
  • the spring coupling grooves 268 and 273 are also formed at a cross angle on one and the other sides of the pad holder 264 .
  • the pad holder 264 is in a state constrained to the rod 262 by the first and second springs coupled in a diagonal direction between the pad holder 264 and the rod 262 and between the pad holder 264 and the sliding rod 267 .
  • the rotational force of the rod 262 is transferred to the pad holder 264 .
  • the rotational force of the rod 262 is transferred to the damping pad 263 through the pad holder 264 so that the conical vibration of the tub 1 can be attenuated through a frictional action between the inner circumference of the cylinder 261 and the damping pad 263 .
  • the vibration generated in the washing machine can be attenuated positively.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
US10/828,204 2003-05-20 2004-04-21 Damper for washing machine Abandoned US20040231372A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2003-0031766 2003-05-20
KR10-2003-0031766A KR100484658B1 (ko) 2003-05-20 2003-05-20 드럼 세탁기의 댐퍼 구조

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US20040231372A1 true US20040231372A1 (en) 2004-11-25

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US10/828,204 Abandoned US20040231372A1 (en) 2003-05-20 2004-04-21 Damper for washing machine

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US (1) US20040231372A1 (ko)
EP (1) EP1479811A1 (ko)
KR (1) KR100484658B1 (ko)
CN (1) CN1316106C (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070017260A1 (en) * 2003-07-10 2007-01-25 Gerold Dillmann Frictional damper especially for cylinder washing machines
US20150128654A1 (en) * 2013-11-11 2015-05-14 Dongbu Daewoo Electronics Corporation Suspension for washing machine and washing machine with the same

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2305874B1 (en) 2002-12-27 2017-08-23 LG Electronics Inc. Drum type washing machine
KR100464054B1 (ko) 2002-12-27 2005-01-03 엘지전자 주식회사 일체형 캐비넷/터브를 구비한 드럼 세탁기
KR100634802B1 (ko) 2004-07-20 2006-10-16 엘지전자 주식회사 드럼 세탁기
US7841220B2 (en) 2005-09-30 2010-11-30 Lg Electronics Inc. Drum-type washing machine
KR100786083B1 (ko) * 2006-03-29 2007-12-17 엘지전자 주식회사 탑 로딩 드럼 세탁기
US7536882B2 (en) 2006-03-29 2009-05-26 Lg Electronics Inc. Drum type washing machine
KR101572154B1 (ko) * 2008-12-19 2015-11-27 삼성전자 주식회사 댐퍼 및 이를 갖춘 세탁기와 그 제어방법
KR101048092B1 (ko) * 2009-09-25 2011-07-08 주식회사 한일정밀 드럼세탁기용 댐퍼
CN109764074A (zh) * 2019-02-21 2019-05-17 珠海格力电器股份有限公司 可满足舰船环境的减振装置
CN111691131B (zh) * 2019-03-12 2023-06-20 青岛海尔洗衣机有限公司 减震器和衣物处理设备

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US4955467A (en) * 1987-11-10 1990-09-11 Fluor Corporation Energy damping device
US5133435A (en) * 1989-12-20 1992-07-28 Tayco Developments, Inc. Adjustable dry friction shock absorber
US20030183994A1 (en) * 2002-03-27 2003-10-02 Atwater D. Stuart Damper spring strut

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DE3438348A1 (de) * 1984-10-19 1986-04-24 AKO-Werke GmbH & Co KG, 7988 Wangen Reibungsdaempfer
DE4018599A1 (de) * 1989-07-10 1991-01-24 Miele & Cie Reibungsdaempfer, insbesondere fuer trommelwaschmaschinen
IT1268466B1 (it) * 1993-12-16 1997-03-04 R & D S Srl Ammortizzatore per macchine lavatrici, in particolare macchine lavabiancheria domestiche
DE19940191A1 (de) * 1999-08-25 2001-03-15 Suspa Holding Gmbh Reibungsdämpfer

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4955467A (en) * 1987-11-10 1990-09-11 Fluor Corporation Energy damping device
US5133435A (en) * 1989-12-20 1992-07-28 Tayco Developments, Inc. Adjustable dry friction shock absorber
US20030183994A1 (en) * 2002-03-27 2003-10-02 Atwater D. Stuart Damper spring strut

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070017260A1 (en) * 2003-07-10 2007-01-25 Gerold Dillmann Frictional damper especially for cylinder washing machines
US7565823B2 (en) * 2003-07-10 2009-07-28 Aweco Appliance Systems Gmbh & Co. Kg Frictional damper especially for cylinder washing machines
US20150128654A1 (en) * 2013-11-11 2015-05-14 Dongbu Daewoo Electronics Corporation Suspension for washing machine and washing machine with the same
US9388522B2 (en) * 2013-11-11 2016-07-12 Dongbu Daewoo Electronics Corporation Suspension for washing machine and washing machine with the same

Also Published As

Publication number Publication date
EP1479811A1 (en) 2004-11-24
CN1316106C (zh) 2007-05-16
KR20040099698A (ko) 2004-12-02
CN1550609A (zh) 2004-12-01
KR100484658B1 (ko) 2005-04-20

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