Evaluation of Grooved Solid Lubricated Bearings
Technical rept. Jul 1972-Jul 1975
AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OH
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This report describes an evaluation of solid lubricated bearings having grooved inner races. The intent of these grooves was to pump ambient air into the bearing, thus lowering stabilized operating temperatures and providing a means of heat dissipation. Nineteen series of tests were run with grooved and ungrooved bearings over a range of bearing loads and speeds. Bearing stabilization temperature and torque were monitored at each load-speed operating condition. Speeds were varied between 7500 and 30,000 RPM. Axial loads ranged between 75 and 150 pounds. Radial loads varied from zero to 75 pounds. Solid lubrication was provided using retainers of either a silver-mercury-teflon- molybdenum diselenide composite or a gallium-indium-tungsten diselenide compact. Bearing cage unbalance problems prevented a determination of groove effectiveness relative to cooler bearing operation. Speed had a predominant effect on bearing operating temperature and torque. The effects of bearing load and cage material were considerably less. In addition, five duration tests were conducted at 40,000 RPM. A bearing life of 14.5 hours was achieved at this speed with an axial load of 100 pounds.
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