[특허]Bearing surfaces with isotropic finish

[미국특허] Bearing surfaces with isotropic finish 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16C-033/58 F16C-033/36
출원번호	US-0164477 (1993-12-09)
발명자 / 주소	Hashimoto Fukuo F. H. (North Canton OH) Zhou Rao-Sheng (Canal Fulton OH) Howlett Kevin (North Canton OH)
출원인 / 주소	The Timken Company (Canton OH 02)
인용정보	피인용 횟수 : 27 인용 특허 : 0

초록 ▼

A roller bearing has working surfaces, that is surfaces where its rollers and races contact each other, which have extremely shallow irregularities that are nondirectional and thus render the working surfaces isotropic. Moreover, the isotropic surfaces have very low average asperity slopes and likewise a very low plasticity indexes. To derive the high quality working surfaces, the races and rollers are first ground or otherwise mechanically machined to provide the working surfaces with the proper profiles. Then the races and rollers are immersed in a liquid chemical which reacts with the metal at the surfaces and contemporaneously forms a protective coating which inhibits further reaction. Abrading elements within the chemical come against the races and rollers as they are agitated and continuously remove the coating from higher elevations of the working surfaces, so that the chemical continues to react with the metal at those higher elevations. The irregularities diminish to very shallow pits of no particular orientation, thus leaving the working surfaces isotropic. Thereafter, in the absence of the chemical, the protective coating is removed, exposing the high quality working surface. The bearing requires no run in, that is to say, after the initial loading its torque and temperature remain steady at low magnitudes. Moreover, the isotropic surface imparts greater fatigue life.

대표청구항 ▼

A rolling element bearing comprising: an outer race having at least one working surface; an inner race having at least one working surface; rolling elements interposed between said inner and outer races and contacting the races at the working surfaces on the races; said rolling elements and at least one of said working surfaces having an isotropic surface finish. A tapered roller bearing comprising: a metal first race provided with a raceway; a metal second race provided with a raceway that is presented toward the raceway of the first race; a rib having a rib face at the end of the raceway on one of the races; rollers of metal arranged in a circular row between the raceways of the first and second races and having side faces which contact the raceways and end faces which bear against the rib face; the raceways, rib face, and roller side and end faces containing irregularities that are nondirectional so that the surfaces represented by the raceways, rib face, and roller side and end faces are isotropic, the profiles for the raceways and the roller side faces and end faces having been derived by mechanical machining which leaves the raceways and roller end and side faces with irregularities that impart an arithmetic mean roughness (Ra) of not more than about 30 uin., the machined raceways and roller side and end faces having been reduced to an arithmetic mean roughness (Ra) of no more than about 3 uin. and rendered isotropic all by immersing the races and rollers in a liquid chemical that reacts with the metal of the races and rollers along the raceways and roller side and end faces and produces a protective coating which covers the raceways and roller side and end faces and substantially inhibits further reaction until removed, and continuously removing the coating at higher elevations along the raceways and roller side and end faces so that the raceways and roller side and end faces are scoured away at those higher elevations until they are isotropic.

이 특허를 인용한 특허 (27) 인용/피인용 타임라인 분석

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Kelsey, Eric; Beardsley, M. Brad; Feng, Bao, Remanufacturing of bearings using isotropic finishing and thin film coatings.
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Winkelmann, Lane W., Superfinishing of high density carbides.
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Loose, Michael D.; Donnelly, Daniel J.; Clabaugh, Clarence M., Surface treatment method.
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Hashimoto Fukuo, Vibratory finishing process.
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[미국특허] Bearing surfaces with isotropic finish 원문보기

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