In order to study the friction torque characteristics of the ball-roller combined turntable bearing

a mechanical model of the bearing was established

and solved by the Newton-Raphson method. The mechanism of bearing friction torque was analyzed. The friction torque calculation model was established

and the model was tested and verified by using a testing machine. The effect of different structural parameters on bearing friction torque was studied. The results showed that the established model can predict the bearing friction torque well. The bearing friction torque was positively related to the axial load

overturning torque and bearing speed; the reduced initial axial clearance can significantly reduce the bearing friction torque; there was an optimal value for the number of steel balls to minimize bearing friction torque. There was a reasonable interval for the radius of groove curvature to optimize the overall performance of the bearing; appropriately reducing the mass of the cage can effectively reduce the friction torque of the bearing. The research results provide a theoretical basis for the optimal design of the ball-roller combined turntable bearing.