由于某些旧工艺制成的钢衬套曾产生严重的磨损和咬合,因此,降低了滑动轴承的寿命。本发明为一种新的改进了的牙轮钻头的滑动轴承。此轴承包含一个具有优良抗磨性能的硼化抗磨表面的金属衬套。因此,在钻进过程中不会发生咬合。图1为牙轮钻头轴承结构的详细局部剖面图,其轴承衬套24压入牙轮的孔25内,与 Due to the severe wear and seizure of steel bushings made in some older processes, the service life of plain bearings is reduced. The present invention is a new and improved roller cone bit bearing. This bearing contains a bored anti-wear surface with excellent wear resistance of the metal sleeve. Therefore, no bite occurs during drilling. Figure 1 is a detail partial sectional view of a roller cone bit bearing structure with a bearing bushing 24 pressed into the hole 25 of the cone and