Abstract: In order to study the friction torque characteristics of YRT rotary table bearing, a friction torque model is established based on the static numerical analysis. The friction torque model was verified through experiment. The effects of operating parameters, axial clearance and roller crowned types on the friction torque characteristics of YRT rotary table bearing are studied. The result shows that the friction torque is mainly produced by the upper roller when the YRT rotary table bearing is subjected to axial load, and there is an inflection point on the curve of the total frictional torque which is basically proportional to the axial load before and after the inflection point, but the ratio coefficients are different. In the low speed range, its friction torque increases gradually with the increase in rotating speed, but the overall variation range is small. The friction torque of YRT rotary table bearing increases with the decrease in axial clearance, and the ratio coefficient increases gradually. A convex circular arc relieved end roller can be used to reduce the friction torque. Key

Key words: YRTrotarytablebearing, frictiontorque, axialclearance, rollercrownedtype