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- Groups of 120-mm-bore angular-contact ball bearings made from AISI M-50 steel were fatigue tested with a tetraester and a synthetic paraffinic oil at a bearing temperature of 492 K (425 F) in an air environment. Bearing life exceeded AFBMA-predicted (catalog) life by factors in excess of 4 and 10 for the tetraester and synthetic paraffinic fluids, respectively. The final viscosities after 500 hours of operation were 14 and 6 times the initial values, respectively. During the same time period, when the test oil is replaced at a rate approximating the replenishment rate in actual commercial engine usage, no significant increase in lubricant viscosity with time was observed.
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19720014846.
Accession ID: 72N22496.
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View MARC record | catkey: 15946960