对转圆柱滚子轴承动态特性分析

Dynamic characteristics analysis of counter-rotating cylindrical roller bearing

针对内外圈对转圆柱滚子轴承内部复杂的运动特性及相互作用力,通过分析轴承径向游隙的影响因素以及考虑滚子与滚道的接触变形和热效应对油膜厚度的影响,利用拟静力学法建立了轴承的分析模型,并采用NewtonRaphson法进行求解;同时,利用该模型对滚子打滑率进行计算,以验证所采用分析方法的正确性和可靠性。然后,进一步探讨了不同工况下对转圆柱滚子轴承内部组件的转速变化规律与接触特性。结果表明:滚子的自转转速、滚子与滚道的接触载荷均随径向载荷的增大而增大;内、外圈转速变化会使受载区滚子与滚道的接触载荷以一定的规律重新分配,且转速对最小油膜厚度的影响较径向载荷更为明显。研究结果可为对转圆柱滚子轴承的结构优化和生热机理分析提供理论依据。

Aiming at the complex internal motion characteristics and interaction forces of cylindrical roller bearings with counter-rotating inner and outer rings, through analyzing the factors affecting the radial clearance of bearing and considering the contact deformation between rollers and raceway and the influence of thermal effect on oil film thickness, the analytical model of bearing was established by the quasi-static method and solved by the Newton-Raphson method;at the same time, the model was used to calculate the roller slip rate to verify the correctness and reliability of the analysis method. Then, the rotation speed variation and contact characteristics of internal components of counter-rotating cylindrical roller bearing under different working conditions were further discussed. The results showed that the rotation speed of roller and the contact load between rollers and raceway increased with the increase of radial load;the rotation speed change of inner and outer rings could make the contact load between rollers and raceway in the loaded area redistributed regularly, and the influence of rotation speed on the minimum oil film thickness was more obvious than that of radial load. The research results can provide a theoretical basis for structure design and heat generation mechanism analysis of counter-rotating cylindrical roller bearings.