| 摘要 |
FIELD: mining. ^ SUBSTANCE: invention refers to bearings of rolling drilling bits, which include leg with trunnion, which are provided with oil supply channels, cutter fixed on trunnion by means of lock bearing, and sealing elastic ring arranged in groove. Peculiarity of the proposed bearing is that groove for sealing assembly is located to longitudinal axis of trunnion at an angle different from perpendicular. Upper part of groove for sealing ring is offset relative to its lower part towards the bit axis. ^ EFFECT: improvement of sealing reliability and protection of the bearing cavity against slurry penetration, which increases service life of the bearing and bit as a whole. ^ 2 cl, 1 dwg |
