... altered, resulting in diminished motion accuracy, reduced operational lifespan and potential system failure. This study aims to explore the evolution of frictional torque in double-row angular contact ball bearings subjected to axial preload in vacuum environments. Design/methodology/approach...

... was tested, and the values under various working conditions were obtained. Finally, this paper compared and discussed the test results. Findings The test results show that the friction torque value of vacuum environment horizontal installation condition is the largest at different rotational speeds...