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Experimental results reveal that the temperature rise of two contacting bodies in relative sliding motion is related to increase of torque and loads caused by expansion of bearing components. The evolution of effects of thermally induced loads with time in an angular contact ball bearing in a controlled temperature environment is studied experimentally and analytically. The test apparatus is an axially-loaded angular contact ball bearing instrumented to measure the dynamic frictional torque as well as the transient temperature of the raceway and environment inside of a chamber with controlled temperature. Effects of friction torque were examined at different speeds, operating temperatures and pre-loads. The mathematical model developed provides a comprehensive thermal analysis of the ball bearing with provision for frictional heat generation, heat transfer processes and thermal expansion of bearing components.

High friction often involves high wear and power loss. The speed-temperature-dependence of grease lubricated contact ball bearings showed a variety of effects. The test apparatus is an axially-loaded angular contact ball bearing instrumented to measure the frictional torque as well as the transient temperature of the raceway. Effects of friction torque were examined at different speeds, operating temperatures and greases. Torque measurements and transient temperatures were compared for each grease, depending on the operating conditions. After experimental results, the grease formulation under different operation temperatures and different speeds showed significant influence on starting and rotating torques. Moreover the torque showed significant increase during the angular acceleration phase and decreased rapidly after the speed stabilization in all investigated greases.