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从运动学角度研究了牙轮钻头牙齿在井底的运动轨迹，并对牙齿的破岩过程进行了仿真分析。结果表明，牙齿的径向滑移主要与移轴距和吃入深度有关；牙齿的周向滑移主要与轮体转速比和吃入深度有关。移轴距、轮体转速比和吃入深度对破碎坑形状、大小和破碎环带宽度都有明显的影响。随着移轴距增大，破碎环带变宽，钻头对井底覆盖能力增强；随着轮体转速比增加，破碎坑明显变小。锥顶齿主要以刮削和挤压方式破碎井底中心区域；外排齿规径部位以切削方式破碎井壁过渡区。
From the perspective of kinematics, the trajectory of roller cone bit at the bottom of the well is studied, and the rock breaking process of the tooth is simulated. The results show that the radial slip of the tooth is mainly related to the shift of wheelbase and the depth of eating. The circumferential slip of the tooth is mainly related to the wheel speed ratio and the depth of eating. Wheelbase, wheel speed ratio and depth of eating on the shape of broken pits, size and crushing ring width have a significant impact. As the axial distance increases, the crushing zone broadens and the drill bit increases the coverage of the bottom hole. As the rotation speed ratio increases, the crushing pit decreases obviously. The conical top teeth mainly shave and squeeze the central area of the bottom hole; the outer diameter of the tooth cuts the shaft wall transition area by cutting.