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本文把ＹＺ－５５Ａ型牙轮钻机结构简化成合理的有限元模型，并对四种载荷工况作了分析，确定了合理的边界约束条件，同时采用ＳＡＰ５Ｐ程序进行计算分析。
In this paper, the structure of YZ-55A roller-cone drilling rig is simplified to a reasonable finite element model, and the four load conditions are analyzed. The reasonable boundary constraints are determined, and the SAP5P program is used for calculation and analysis.