Towards the effective solid lubrication of ball bearings operating at high temperature

Autor:	E W Roberts, R B Watters, M D Cropper, D J Forster, Matthew R. Hampson
Rok vydání:	2008
Předmět:	Thermal conditioning Toroid Materials science Mechanical Engineering Lubrication Ball (bearing) Torque Mechanical engineering Surfaces and Interfaces Tribology Surfaces Coatings and Films
Zdroj:	Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology. 222:1041-1049
ISSN:	2041-305X 1350-6501
DOI:	10.1243/13506501jet418
Popis:	Several research projects have been completed as part of an ongoing programme of work into solid-lubricated bearings for high-temperature space operation. Testing of bearings indicated that MoS2 lubrication is effective at high temperature, but highlighted a potential problem with the commonly used material PGM-HT – that it can shrink permanently during initial heating, leading to loss of clearances and high torques. This effect was subsequently measured quantitatively – components have been shown to contract by ∼ 1.5 per cent on heating to 250 °C. A thermal conditioning regime was devised to avoid the problems of shrinkage. A number of alternatives to conventional cages were also designed, manufactured, and tested. Hybrid cages, with a metal body and inserts made of self-lubricating materials – PGM-HT and SINTIMID 15M-HT, were identified to be an effective option, which avoids problems with conventional cage designs. Toroidal ball separators made of three different self-lubricating materials – PGM-HT, PTFE, and Vespel SP3 – were also designed, manufactured, and tested.
Databáze:	OpenAIRE
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