Rotary drill bit

Details Rotary drill bit Rotary drill bit

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16C 33/66 (2006.01)

Patent

CA 1171071

ABSTRACT OF THE DISCLOSURE A rotary drill bit comprising a roller cutter which is rotatably carried over a bearing system. The bearing system comprises at least one roller bearing. Fluid is supplied to the bearing system for flushing and lubricating and when needed cooling thereof. For purposes of ensuring suitable fluid flow through the roller bearing and thus ensuring satisfactory lubrication thereof the rollers in the roller bearing are provided with an axial bore.

388818

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