US3598460A - Bearing with controlled friction - Google Patents

Bearing with controlled friction Download PDF

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Publication number
US3598460A
US3598460A US800493A US3598460DA US3598460A US 3598460 A US3598460 A US 3598460A US 800493 A US800493 A US 800493A US 3598460D A US3598460D A US 3598460DA US 3598460 A US3598460 A US 3598460A
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United States
Prior art keywords
polytetrafluoroethylene
percent
bearing
liner
washing machine
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Expired - Lifetime
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US800493A
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English (en)
Inventor
Richard Lee Conrath
Clarence Melvin Overturf
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Fedders Corp
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Fedders Corp
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Publication date
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    • 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
    • D06F37/24—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 vertical axis

Definitions

  • a bearing surface is provided with a lining composed of polytetrafluoroethylene and a second lubricant material and the opposite bearing surface is provided with a roughened surface of controlled degree. On relative motion of the two surfaces, the polytetrafluoroethylene is transferred, at a controlled rate, to the roughened bearing surface to provide lubrication with a controlled degree of friction.
  • a combined support, lubricated bearing, and snubber can be formed employing one surface of a particular polytetrafluoroethylene formulation and a second surface which is provided with a controlled degree of roughness. Movement of the surface having the controlled degree of roughness relative to the polytetrafluoroethylene coated surface results in a transfer of a certain amount of the polytetrafluoroethylene onto the roughened surface. Within a short period of time, the desired amount of polytetrafluoroethylene is transferred, and no further transfer results except as necessary for normal wear. Thus, the bearing surface is one with long life.
  • a truncated, hemispherical bearing is provided with a polytetral'luoroethylene lining.
  • a mating hemispherical surface is placed adjacent this polytetrafluoroethylenc lining for relative movement, the mating surface acting as the support for the operational parts of'the washer.
  • the rotating tub, agitator, stationary tub, and transmission are supported by the mating surface.
  • This mating surface is provided with a controlled degree of roughness.
  • the unbalanced nature of the wet clothing within the tub causes the tub to move away from its center, and toward the center of gravity created by the off balance load. This creates a nutational movement about the pivot of the system, which is about the hemispherical bearing.
  • the transfer of a sufficient quantity of material is accomplished in about 1 hour of operation and, thereafter, additional polytetrafluoroethylene is not transferred except that minute amount needed to compensate for losses due to wear.
  • the net effect is two mating, hemispherical surfaces of polytetrafluoroethylene which provides the necessary lubricity for relative movement of the two surfaces during the nutational movement of the rotating tub.
  • the controlled roughness of the upper mating surface there is also a degree of friction between the two surfaces which aids in retarding the nutational movement.
  • FIG. 1 is a sectional view of an automatic washing machine incorporating the bearing of the present invention
  • FIG. 2 is an exploded, perspective view of the base of the washing machine and the bearing of the present invention
  • FIG. 3 is an exploded, perspective view of the bearing assembly of the present invention.
  • FIG. 4 is a sectional view of the bearing of the present invention.
  • an automatic washing machine including an outer casing l of conventional structure with a pivoted clothes door 4 for insertion and removal of the clothing to be washed.
  • the washing machine includes an outer stationary tub 5, to the bottom of which are affixed braces 6.
  • Springs 7 are attached to the upper portion of these braces and to the base 8 of the washing machine by means well known in the art. These springs aid in resisting vibrational movement of this outer tub.
  • an inner tub 10 which is supported in such a manner that it can be rotated at rapid speeds for centrifugal extraction of water held within clothing contained in the tub.
  • an agitator 11 mounted on a center post 12 for oscillatory movement, so as to provide a washing action for the clothing placed within the tub.
  • a transmission 14 is provided and operatively connected to both the agitator post and the inner tub so as to oscillate the agitator and rotate the inner tub at the appropriate times.
  • the weight of the transmission l4, inner tub l0, and agitator l I is supported by the outer tub 5 through the clamp rings l5, l6 and bolts [7.
  • This weight is, in turn. carried by the outer tub braces 6 to the upper suspension housing 20, a portion of the bearing of the present invention.
  • the weight of drive shaft 21 is similarly supported by this suspension housing.
  • Power for the machine is provided by motor 22 through its shaft 23, drive pulley 24, drive belt 25, and driven pulley 26.
  • the driven pulley turns the drive shaft 21, and, through the transmission, the agitator post 12 and inner tub 10.
  • a portion of the brake 27 to restrain rotational movement of the driving members at the appropriate time, is also illustrated.
  • the base of the washer 8, with one of the suspension springs 7 attached by eye bolt 30 is shown in FIG. 2, along with the parts of the bearing assembly of the present invention.
  • the center portion of the vase 8 is formed as a truncated hemisphere 31 which acts as the structural supporting member for the bearing assembly and, through it, the operative portions of the washing machine.
  • a snubber lining pad 32 is placed above this truncated hemisphere to act as a slightly resilient support for the polytetrafluoroethylene lining 33.
  • the polytetrafluoroethylene lining 33 is provided with a contour to conform to the snubber lining pad 32 and structural member 31.
  • a reinforcement plate 34 is inserted through the center of the polytetrafluoroethylene liner 33, snubber lining pad 32, and structural member 31 and this reinforcement plate has a flange which overlies a flattened portion of the polytetrafluoroethylene liner. These four pieces are held together by rivets 35a, or other suitable means, which pass through the openings 35 in reinforcement plate 34, openings 36 in snubber lining pad 32, and openings 37 in structural portion 31.
  • the upper suspension housing assembly 20, to which the brace 6 is attached, is also shown in this figure.
  • Similar parts are shown in exploded perspective view in H6. 3, including the truncated hemispherical portion 31 of the washer base 8, the snubber lining pad 32, polytetrafluoroethylene liner 33, and retaining ring 34.
  • the upper suspension housing 20 with the mating surface 40 is shown, in this figure.
  • the surface 40 is the one which has the controlled degree of roughness for providing the combination of lubricity and controlled friction.
  • the radial bearing assembly 41 is shown assembled in this view, while the parts and surfaces in assembled relation are shown in FIG. 4.
  • the snubber lining pad 32 is provided to give some resilient support to the polytetrafluoroethylene lining 33. This pad 32 must also be capable of withstanding a certain amount of heat.
  • One of the materials which can be employed for the snubber lining pad 32 is a chloroprene rubber cork. Such a material should have a hardness, in units of Shore A, of from 65 to 80, and specific gravity of approximately 0.8.
  • the compression set should be a maximum of 80 percent, a compressibility, under300 lbs. per square inch, of from 18 to 28, and a minimum recovery of 95 percent.
  • the polytetrafluoroethylene lining 33 is formed from polytetrafluoroethylene which also contains a further lubricant, such as carbon or graphite.
  • the type of polytetrafluoroethylene is preferably that sold by du Pont under the name Teflon T.F.E. and it preferably comprises from 70 percent to 80 percent of the total composition.
  • the liner contains from 20 percent to 30 percent carbon and approximately 1 percent of a compatible color identifier.
  • the liner 33 is preferably formed by compacting a powder mixture of the various components and then curing in a flat configuration at a temperature of less than 700 F. After cure, but before cooling the part, it is formed into the truncated, hemispherical configuration shown in the figures.
  • the part may be cooled and reheated between curing and forming.
  • the liner is formed with from about 74 percent to 76 percent polytetrafluoroethylene and from 23 percent to 25 percent carbon filler, along with about 1 percent of a compatible color identifier.
  • the roughness of the surface 40 of the upper suspension housing 20 is extremely critical in the formation of the bearing of the present invention.
  • the surface is preferably machined to a finish of 35 root mean square, maximum. It is then grit or sand blasted, by any of a variety of methods, to a roughness of 250:50 root mean square with a peak frequency of 328: peaks per linear inch. It is important that, during the blasting operation, the surface 40 be maintained in a condition such that it is free of oils, grease, cutting fluids, etc. and that the center portion of the bore, through which the drive shaft 21 and sleeve 37 fit be protected from the blasting operation.
  • a preferable method of accomplishing this grit blasting of the surface 40 is in a centrifugal grit-blasting machine employing steel grit with an average hardness of from 56 to 60 Rc, tested with a Tukon microhardness tester with a Knoopidenter. All of the grit should pass a No. 40 sieve.
  • the tub and shaft achieve a nutational movement about the pivot at the lower structural support member 31, because of the generally offcenter loading of the wet clothing within the tub.
  • Sufficient pressure is created at the bearing as the upper housing suspension member 20 provides the support for all operating parts of the washing machine, either through the braces 6, or directly through the drive shaft 21.
  • the snubber springs provide additional pressure on the bearing.
  • the nutational movement of the upper housing bearing causes the roughened surface 40 to move against the polytetrafluoroethylene liner 33, causing a transfer of polytetrafluoroethylene from the liner to the roughened surface.
  • an improved bearing including a transfer of polytetrafluoroethylene to a specially roughened surface
  • the adjoining polytetrafluoroethylene surfaces are replenishing and where the net effect is a bearing having lubricity, with controlled friction for resisting, at least, nutational movement.
  • Such a bearing is characterized by extremely long life.
  • An improved bearing including a first surface in the form of a truncated hemisphere, said surface having a lining composed of polytetrafluoroethylene, and a second surface, having a hemispherical configuration mating with the first surface lining, and having a controlled degree of roughness, said second surface becoming coated with polytetrafluoroethylent upon relative motion of the two surfaces.
  • An improved bearing including a first surface with a lining composed of polytetrafluoroethylene and a resilient pad between said first surface and said polytetrafluoroethylene liner, and a second surface mating with the lining and having a controlled degree of roughness, said second surface becoming coated with polytetrafluoroethylene upon relative motion of the two surfaces.
  • a washing machine having an outer stationary tub, an inner tub capable of rotational movement, and a transmission with a drive shaft below said tubs
  • the improvement which comprises a hemispherical suspension bearing placed adjacent the base of said washer and supporting the weight of said inner and outer tubs, transmission, and drive shaft, the lower surface of said suspension, bearing being provided with a liner comprises of polytetrafluoroethylene, and the upper surface of said suspension bearing, adjacent said polytetrafluoroethylene liner, being provided with a surface of controlled roughness.
  • polytetrafluoroethylene liner is composed of from 70 percent to percent polytetrafluoroethylene and from 20 percent to 30 percent carbon.
  • polytetrafluoroethylene, liner is composed of from 74 percent to 76 percent polytetrafluoroethylene, 23 percent to 25 percent carbon, and approximately 1 percent of a compatible color identifier.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Support Of The Bearing (AREA)
US800493A 1969-02-19 1969-02-19 Bearing with controlled friction Expired - Lifetime US3598460A (en)

Applications Claiming Priority (1)

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US80049369A 1969-02-19 1969-02-19

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US (1) US3598460A (de)
DE (1) DE2007017A1 (de)
ES (1) ES377065A1 (de)
GB (1) GB1223536A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854308A (en) * 1973-01-23 1974-12-17 Whirlpool Co Suspension mounting assembly for automatic washer
US4039234A (en) * 1976-05-19 1977-08-02 Kelly William F Washing machine bearing
DE3000755A1 (de) * 1979-01-10 1980-07-24 Raytheon Co Trommelaufhaengungsvorrichtung fuer waschmaschinen und waescheschleudern
US4403484A (en) * 1981-09-28 1983-09-13 General Electric Company Dual node support assembly for washing machine
US4475363A (en) * 1983-06-06 1984-10-09 General Electric Company Adjustable dual node support assembly for washing machine
US5117658A (en) * 1990-12-26 1992-06-02 Raytheon Company Washing machine having improved out-of-balance performance
US6196370B1 (en) * 1998-03-27 2001-03-06 Tonoga Limited Package conveying surface with liner
US6430971B1 (en) 2000-05-16 2002-08-13 Whirlpool Corporation Spherical surface drive block for washing machine basket
US20140026623A1 (en) * 2012-07-30 2014-01-30 Keunjoo Kim Laundry processing machine
KR20140016092A (ko) * 2012-07-30 2014-02-07 엘지전자 주식회사 세탁물 처리기기
CN113251824A (zh) * 2021-05-17 2021-08-13 河南新野纺织股份有限公司 一种环保型的除氧器排气能量回收再循环设备

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976998A (en) * 1956-12-03 1961-03-28 Maytag Co Damping system for a washing machine
US3049025A (en) * 1959-05-04 1962-08-14 Maytag Co Energy absorption stop
US3130933A (en) * 1960-12-15 1964-04-28 Ampex Magnetic tape apparatus
US3247689A (en) * 1964-05-07 1966-04-26 Westinghouse Electric Corp Tub unit and suspension basic structure for agitator washer
US3279936A (en) * 1964-11-27 1966-10-18 Forestek Plating & Mfg Co Treating surfaces with perfluorocarbon polymers
US3319012A (en) * 1960-12-30 1967-05-09 Reed Gordon Howard Method and apparatus for lubricating magnetic recording tape
US3342667A (en) * 1963-08-23 1967-09-19 Woodmont Products Inc Dry fluorocarbon bearing material
US3445131A (en) * 1965-10-30 1969-05-20 Ehrenreich & Cie A Ball joints,in particular for guides and steering gear,preferably of motor vehicles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976998A (en) * 1956-12-03 1961-03-28 Maytag Co Damping system for a washing machine
US3049025A (en) * 1959-05-04 1962-08-14 Maytag Co Energy absorption stop
US3130933A (en) * 1960-12-15 1964-04-28 Ampex Magnetic tape apparatus
US3319012A (en) * 1960-12-30 1967-05-09 Reed Gordon Howard Method and apparatus for lubricating magnetic recording tape
US3342667A (en) * 1963-08-23 1967-09-19 Woodmont Products Inc Dry fluorocarbon bearing material
US3247689A (en) * 1964-05-07 1966-04-26 Westinghouse Electric Corp Tub unit and suspension basic structure for agitator washer
US3279936A (en) * 1964-11-27 1966-10-18 Forestek Plating & Mfg Co Treating surfaces with perfluorocarbon polymers
US3445131A (en) * 1965-10-30 1969-05-20 Ehrenreich & Cie A Ball joints,in particular for guides and steering gear,preferably of motor vehicles

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854308A (en) * 1973-01-23 1974-12-17 Whirlpool Co Suspension mounting assembly for automatic washer
US4039234A (en) * 1976-05-19 1977-08-02 Kelly William F Washing machine bearing
DE3000755A1 (de) * 1979-01-10 1980-07-24 Raytheon Co Trommelaufhaengungsvorrichtung fuer waschmaschinen und waescheschleudern
US4250724A (en) * 1979-01-10 1981-02-17 Raytheon Company Suspension system for tub assembly in clothes washing machine
US4403484A (en) * 1981-09-28 1983-09-13 General Electric Company Dual node support assembly for washing machine
US4475363A (en) * 1983-06-06 1984-10-09 General Electric Company Adjustable dual node support assembly for washing machine
US5117658A (en) * 1990-12-26 1992-06-02 Raytheon Company Washing machine having improved out-of-balance performance
US6196370B1 (en) * 1998-03-27 2001-03-06 Tonoga Limited Package conveying surface with liner
US6216842B1 (en) * 1998-03-27 2001-04-17 Tonoga Limited Object conveying surface with liner and method of applying the liner to the surface
US6430971B1 (en) 2000-05-16 2002-08-13 Whirlpool Corporation Spherical surface drive block for washing machine basket
US20140026623A1 (en) * 2012-07-30 2014-01-30 Keunjoo Kim Laundry processing machine
KR20140016092A (ko) * 2012-07-30 2014-02-07 엘지전자 주식회사 세탁물 처리기기
US10011936B2 (en) * 2012-07-30 2018-07-03 Lg Electronics Inc. Laundry processing machine
CN113251824A (zh) * 2021-05-17 2021-08-13 河南新野纺织股份有限公司 一种环保型的除氧器排气能量回收再循环设备
CN113251824B (zh) * 2021-05-17 2022-08-30 河南新野纺织股份有限公司 一种环保型的除氧器排气能量回收再循环设备

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Publication number Publication date
GB1223536A (en) 1971-02-24
DE2007017A1 (de) 1970-09-10
ES377065A1 (es) 1972-12-16

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