Bearing means in rotary drill bits

Details Bearing means in rotary drill bits Bearing means in rotary drill bits

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16C 17/03 (2006.01) F16C 33/10 (2006.01)

Patent

CA 1127627

ABSTRACT OF THE DISCLOSURE A rotary drill bit comprising at least one roller cutter which is rotatably supported over bearing means and provided with cutting means. The bearing means comprises a radial friction bearing with a bearing element of wear resistant material, such as hard metal. In order to improve the surface contact between the bearing element and the inner bearing surface in the roller cutter, and in order to remove impurities from the cooperating bearing surfaces a longitudinal groove is provided in the bearing element. The fluid primarily supplied for flushing the groove is secondarily used to cool the bearing element.

347883

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