过载工况下圆柱滚子轴承永久变形量计算

Calculation of Permanent Deformation of Cylindrical Roller Bearings under Overload Condition

针对航天轴承运行过程中出现的过载问题,在弹塑性力学和赫兹接触理论的基础上,推导了圆柱滚子轴承线接触弹塑性应力应变的计算公式,并建立了圆柱滚子轴承弹塑性接触有限元模型,计算过载下圆柱滚子轴承各部件接触区域的永久变形量。对过载轴承进行静压试验,测量其最大永久变形量,与理论计算结果及仿真结果进行了对比。对比结果表明:弹塑性应力应变计算公式适用于低过载工况下圆柱滚子轴承永久变形量的计算。对于高过载工况下圆柱滚子轴承永久变形量,使用有限元法计算结果更为准确,并且有限元法能够更精确地获取所有过载工况下轴承各部件上发生的永久变形量。

In order to solve the overload problem of the operation of aerospace bearing,the contact stress and strain formula in the elastic and plastic stage of cylindrical roller bearing was given based on elastic-plastic mechanical theory and Hertz contact theory. A cylindrical roller bearing elastic-plastic contact finite element model was established to calculate the permanent deformation at the contact areas under overload condition.Comparing the theoretical calculation results and the simulation results respectively with the static pressure test results of the maximum permanent deformation. The results suggest that the contact stress and strain formula in the elastic and plastic stage can be applied to the permanent deformation of cylindrical roller bearings under light overload. The finite element method is more suitable for high overload condition. The permanent deformation of every contact areas can be more accurately obtained by the finite element method under all overload condition.