Rotary drill bit

Details Rotary drill bit Rotary drill bit

E - Fixed Constructions

21

B

255/73

E21B 10/00 (2006.01) E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16C 37/00 (2006.01)

Patent

CA 1108118

ABSTRACT OF THE DISCLOSURE A rotary drill bit comprising at least one rotatably carried roller cutter and provided with passages for supplying cooling fluid to the bearing system of the roller cutter. For purposes of preventing the heat generated at an annular surface transmitting axial forces from causing rapid bearing wear a recess is provided in the annular surface. The recess communicates with the passages and extends entirely around the bearing shaft for allowing circulation of cooling fluid therearound.

331090

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