YRT转台轴承摩擦力矩特性研究

Study of Friction Torque Characteristics of YRT Rotary Table Bearing

为研究YRT转台轴承的摩擦力矩特性,在对其静力学分析基础上建立了摩擦力矩模型,并对摩擦力矩模型进行了试验验证。基于模型计算结果,分析了工况参数、轴向游隙和滚子修形对摩擦力矩特性的影响规律。结果表明:YRT转台轴承在承受轴向载荷时,摩擦力矩主要由上排滚子产生,且摩擦力矩曲线上存在一拐点,拐点前后摩擦力矩与轴向载荷基本呈比例关系,但比例系数不同;在低速范围内,摩擦力矩随着转速的增大逐渐增大,但总体变化幅度较小;YRT转台轴承摩擦力矩随轴向游隙的减小逐渐增大,且增幅逐渐增大;使用全凸圆弧修形滚子可以有效地降低摩擦力矩。

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.