| 摘要 |
A roller-cutter drill bit has legs with axles on which sealed roller-cutters are mounted, with bearing supports, each of those has peripheral and end roll bearings and support slide bearing formed with the end of the axle and support toe fixed in the cavity of roller cutter at axis of rotation. To increase durability of roll bearings of the roller-cutter drill bit and to simplify design of its roller-cutter supports peripheral bearing of each support is arranged as radial spherical two-row roll bearing that is rigidly fixed on the axle near its basis, and the end bearing is arranged as radial-support hemi-spherical one-row bearing with barrel-like rollers equipped with separator. |
