Oil Exchange between Ball Bearings and Porous Polyimide Ball Bearing Retainers
作者:
P.A. Bertrand,
D.J. Carré,
期刊:
Tribology Transactions
(Taylor Available online 1997)
卷期:
Volume 40,
issue 2
页码: 294-302
ISSN:1040-2004
年代: 1997
DOI:10.1080/10402009708983658
出版商: Taylor & Francis Group
关键词: Ball Bearings;Space Vehicles;Polymeric Materials;Synthetic Lubricants
数据来源: Taylor
摘要:
The kinetics of the absorption of lubricating oils and moisture from air into porous polyimide, as well as the exchange of oil between porous polyimide retainers and oil baths or operating bearings, have been measured. Oil absorption into porous polyimide is much faster than into cotton-phenotic. Water is absorbed by oil-impregnated polyimide, but little or no oil is lost during the process. Oil is absorbed by air-equilibrated polyimide at a slower rate than by dry polyimide. Porous polyimide is much easier to impregnate with oil than cotton-phenolic, and is also much more tolerant, of storage in air once impregnated. Oil within a porous polyimide ball bearing retainer exchanges slowly with oil in a bath in which the retainer is placed. The exchange is due to diffusion of the oils, and the diffusion coefficient is determined to be 3 × 10−9cm2/s for the oils used in these experiments. Oil is exchanged quickly between polyimide retainers and well-lubricated operating bearings. The exchange is faster than a diffusion process, and is probably driven by bearing action. In these experiments, the authors could detect no net gain or loss of oil from the retainer or the bearing parts. Only about one-half of the oil originally supplied to the parts is available to the retainer; the rest remains elsewhere in the bearing.
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