从理论上阐述了牙轮钻头轴承组失效的原因，由于滚柱轴承的径向游隙过大，影响了轴承的接触强度和滚柱端部的应力集中，导致该柱失去其设计的几何特征。 The reasons for the failure of the roller bit bearing set are expounded in theory. Since the radial clearance of the roller bearing is too large, the contact strength of the roller bearing and the stress concentration at the end of the roller will be affected, which will cause the column to lose its geometrical design features .