球柱联合转台轴承摩擦力矩特性

Friction torque characteristic of ball-roller combined turntable bearing

为研究球柱联合转台轴承摩擦力矩特性,建立了轴承的力学模型,采用Newton-Raphson法对模型进行求解。分析了轴承摩擦力矩产生机理,建立了摩擦力矩计算模型,利用试验机对模型进行了试验验证,研究了不同结构参数对轴承摩擦力矩的影响。结果表明:所建立的模型可较好的实现轴承摩擦力矩预测,轴承摩擦力矩与轴向载荷、倾覆力矩和轴承转速呈正相关;减小初始轴向游隙可显著降低轴承摩擦力矩;钢球数量存在一个最优值使轴承摩擦力矩最小;沟曲率半径存在合理区间使轴承综合性能最优;适当减小保持架质量可有效降低轴承摩擦力矩。研究结果为球柱联合转台轴承的优化设计提供了理论依据。

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.