| 摘要 |
Drill bit bearing structure has pad with inclined pin, roller cutter installed on it, with circular reboring, and lock unit as rods in T-like shape cross part of which is arc-like in shape, placed in radial channels of pin with possibility of interaction of cross section with walls of circular reboring of roller cutter. Lock unit additionally includes pressing elements installed in radial channels, at that the radial channels themselves are made dead. Such implementation makes it possible to increase durability of drill bit bearing structure. |
