| 摘要 |
A roller drill bit bearing consists of a pin on which a roller cutter is mounted by means of peripheral and end roller bearings, retaining ball bearing, between parameters of those given relations are set, on support end of the pin build-up element is arranged for formation of slide bearing “thrust face of leg – thrust face of roller-cutter”, center of most far from axis of drill bit ball of retaining frictionless bearing is placed at distance A from axis of the bit that is equal toA=0,314∙D,where D– diameter of the bit, mm;and parameters of the bearings are chosen according to following ratios:,where d– diameter of roller of small end frictionless bearing, mm;Dmp – outer diameter of small roller end frictionless bearing, mm;D– diameter of ball of retaining frictionless bearing, mm;D3k – outer diameter of ball retaining frictionless bearing, mm;d– diameter of roller of large peripheral frictionless bearing, mm;Dbp – outer diameter of large roller peripheral frictionless bearing, mm. |
