Capacity calculation of slewing bearing is different from the normal bearing design theory .The traditional method ignored many factors , resulting in a large error in the results .A few models developed in recent years are very complex and require a long time to complete the calculations .This paper illustrates a new method , in which a nonlinear spring is used to establish a finite element model of the pitch slewing bearing .The calculation precision of this model is compared with the empirical formula;the results verify the correctness of the model .Then , a detailed analysis of the influence of the flange thickness , wall thickness , flange tube structure type and flange surface flat-ness on the load distribution was completed based on the simplified model .The results showed that the flange thick-ness to slewing bearing thickness should be 50%, the flange tube wall thickness has a small amount of influence on the load distribution , but the wall should be arranged in close proximity to the ball as much as possible .Further-more, the flange flatness error seriously influences the contact pressure between the raceway and the ball , which se-riously affects the slewing bearing capacity and service life , so it should be strictly controlled during processing and installation .%回转支承的承载能力计算无法沿用普通轴承的理论，传统计算方法忽略众多因素影响，结果误差较大，近些年科研人员采用的计算模型复杂、计算时间长。本文采用非线性弹簧建立了变桨回转支承的有限元模型，并与经验公式进行对比，验证了模型的正确性。在此基础上，详细分析安装法兰厚度、法兰筒壁厚、法兰筒结构形式及法兰端面的平面度对载荷分布的影响。结果表明：安装法兰厚度以回转支承厚度50％为宜，法兰筒壁厚度对载荷分布影响较小，但筒壁应尽量设计在靠近滚珠一侧，法兰平面度误差对回转支承滚道与滚珠接触压力影响较大，严重影响回转支承的承载能力和使用寿命，在加工和安装过程中要严格控制。
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