Abstract: High-speed heavy-duty gears often work in a mixed lubrication state. In order to accurately predict the wear level of tooth surfaces， a wear analysis model of oil-lubricated gears was proposed to enable accurate description of the wear process of mixed lubrication tooth surfaces at the microscopic dimensions. The non-Gauss rough surface was generated according to the as-measured tooth profile characteristics， and the coupling results of thermal-stress were used as the working conditions and initial conditions of mixed lubrication analysis. Then pressure distribution， lubrication state and wear trend of the tooth surface were studied to reveal the wear mechanism. The results showed that surface wear of oil lubricated gears is affected by miscellaneous factors. In particular， the shape and distribution direction of asperity have a significant effect on wear degree. The prediction results show good agreement with the experimental measurements. It indicates that the wear prediction method of mixed lubrication tooth surface has practical engineering significance.

Key words: spur gears, tooth surface wear, mixed lubrication, asperity contact, wear experiments