FRICTION MOMENT EVOLUTION IN THE RUNNINGIN PERIOD OF HIGH-SPEED ANGULAR CONTACT BALL BEARINGS
Abstract
During the running-in, the contacting surfaces of various mechanisms undergo continuous change of the micro-topography. When the lubricant is able to reach the steady operating state, this transient period stops. The all-steel and hybrid silicon nitride angular contact ball bearings from 7206C series, running at speeds between 9000 and 45000 rpm, axially preloaded and lubricated by mineral oil-mist, were tested on a high-speed test-rig. The friction moment and the developed temperature were monitored. The running-in period last longer for all-steel bearings, the severe wear being more extended than in the hybrid rolling bearings. The friction moment is also greater in all-steel bearings.
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