Lubricaton Characteristics of Rolling Bearings Lubricated by Self-lubricating Composite Retainers Part 1 -Selectoin of Bearings for Earth Sensors
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Space Technology Research Group, National Aerospace Laboratory(NAL)
Space Technology Research Group, National Aerospace Laboratory(NAL)
HOSEI University
Former National Aerospace Laboratory(NAL)
出版者
航空宇宙技術研究所
出版者（英）
National Aerospace Laboratory(NAL)
雑誌名
航空宇宙技術研究所報告
雑誌名(英)
Technical Report of National Aerospace Laboratory TR-1019
巻
1019
ページ
11
発行年
1989-04
抄録（英）
More than 90％ of rolling bearing for space use are lubricated by solid lubricant films transferred from retainers to balls and races; successful operation of space driving mechanisms depends on the selection of retainer materials made of self-lubricating composites together with the selection of solid lubricant films deposited in advance on the surfaces of balls and races for the initial stage of operation. The paper describes the process and the results of the selection tests carried out for ball bearing used in the earth sensors which were operated from February 1981 to April 1982 on the Engineering Test Satellite IV. Among 8 candidate materials tested in the form of a retainer, the combination of sputtered MoS2 films and retainers composed of PTFE, glass fibre and molybdenum showed by far the best tribological response. When applied to angular-contact type ball bearings (#7204), this combination lubricated them for more than 10,000 hours at 2,000 rpm under a thrust load of 50N in 10(exp -6) Pa. The bearings actually used in flight were lubricated by PTFE coatings and retainers made from PTFE, glass fibre, and lead oxide for fear that an MoS2 film would be worn off during tests conducted on earth before the launch. Test results indicated this particular conbination is more effective in air than in vacuo. The addition of MoS2 to the composites did not improve their lubricating ability, suggesting that PTFE performs the main role in transfer film lubrication.
Lubricaton Characteristics of Rolling Bearings Lubricated by Self-lubricating Composite Retainers Part 1 -Selectoin of Bearings for Earth Sensors
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