The tricone bit is prone to having a failure bearing under high WOB and high RPM. To improve the roller cone bit bearing structure stress, increase the tooth placement space and the thickness of the shell, a three dimensional model has been established including the leg, cone and tooth. The finite element analysis on the roller cone bit bearing structure under extreme conditions is carried out to gain the Mises stress and contact pressure dis-tribution of the bearing structure. Using the method of orthogonal experimental design, by optimizing the length and diameter of the large and small journal, the bearing structure dimension sensitivity has been studied. Through para-metric analysis, the optimal size of the bearing structure is obtained, thus, the large and small journal has a length of 19 mm and 6 mm respectively, the large and small journal has a diameter of 34 mm and 14 mm respec-tively. The study results could provide significant guidance for research on high performance roller cone bit.%牙轮钻头轴承在高压、 高转速工况下很容易发生失效. 为了改善牙轮钻头轴承结构受力, 增加布齿空间和壳体厚度, 建立了包含牙爪、 牙轮和牙齿的三维模型, 对极限工况下的牙轮钻头轴承进行有限元分析, 获得了轴承结构Mises应力和接触压力分布情况. 利用正交试验设计方法, 改变轴承结构大轴颈长度和直径、 小轴颈长度和直径, 开展了轴承结构尺寸参数敏感性研究, 通过参数化分析得到轴承结构最优尺寸组合, 即大、 小轴颈长度分别为19和6 mm, 大、 小轴颈直径分别为34和14 mm. 研究结果对研究高性能牙轮钻头具有指导意义.
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