Abstract
High temperatures impose special problems on the operation of high speed axially loaded ball bearings. Among these are fatigue, lubricant deposits, and aggravated friction and surface damage at areas of metal contact. This paper is concerned only with the friction and surface damage aspects of the problem. Since a small scale bearing was to be used in the experimental work, an analysis was made of spinning, one of the major friction sources, and the small-scale operating conditions were chosen to give ball-to-race surface temperatures approaching, as near as practical, the corresponding temperatures for full-scale bearings. Bearing rig tests in a once-through jet lubrication system with silicone fluid, mineral oil, and a synthetic ester lubricant resulted in friction failures at approximately 350F, 650F, and 800F, respectively. This is in agreement with full-scale experience and lends support to the validity of the rig tests. With oil-air mist lubrication failure occurred at a much lower temperature. This...
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