Abstract: Aiming at low friction torque angular contact ball bearings, based on the law of energy conservation, the effect of waviness of bearing working surfaces upon the friction torque fluctuation is investigated. The relationships between the amplitude and harmonic orders of waviness of bearing working surfaces and the fluctuation of bearing friction torque are analyzed theoretically, finally the main waviness harmonic orders and corresponding excited frequency of the inner raceway, outer raceway and ball working surfaces are given and verified by experiment. The results show that the harmonic orders of inner raceway and outer raceway equal , and the sum or difference of two different harmonic orders comes up to , which are the primary harmonic orders to stimulate the fluctuation of bearing friction torque. The harmonic orders exciting frequency of outer raceway equal and the inner raceway is . The even harmonic orders of waviness of ball working surface make an exciting effect on the fluctuation of bearing friction torque, and the odd harmonic orders make no effect. The corresponding excited frequency of excited harmonic orders is . The research provides theoretical basis to control the processing parameter of the low friction torque angular contact ball bearings.

Key words: Angular contact ball bearings, Fluctuation, Friction torque, Waviness