E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/73
E21B 10/22 (2006.01) E21B 10/24 (2006.01)
Patent
CA 1221961
ABSTRACT OF THE DISCLOSURE THE present invention relates to an improved rotary drill bit having a bit body with at least one bearing pin attached thereto for rotatably carrying a roller cutter over a bearing system. The bearing system includes at least a forward bearing and a rear bearing with at least one inflow passage provided in the bit body for supplying fluid through the passage to the rear bearing during operation of the bit for flushing and for cooling of the rear bearing. me passage terminates in the bearing system ahead of a forward end of the rear bearing between an intermediate sealing arrangement and an annular outlet gap provided between the bit body and the roller cutter. me bearing pin includes a flange for axially fixing a forward end of the rear roller bearings with the inflow passage preferably termi- nating on the periphery of the flange. me sealing arrangement preferably engages a forward radial surface of the flange on the bearing pin. In accordance with a further aspect of the present invention, a particular sealing arrangement is provided which more effectively seals the forward bearing space from the rear bearing space. Further, the arrangement of the various elements of the bearing system are adapted to minimize the amount of space required.
467971
Gowling Lafleur Henderson Llp
Santrade Limited
LandOfFree
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