Rock bit bearing structure

Details Rock bit bearing structure Rock bit bearing structure

E - Fixed Constructions

21

B

76/21, 255/78

E21B 10/00 (2006.01) E21B 10/24 (2006.01) F16C 19/06 (2006.01) F16C 33/64 (2006.01)

Patent

CA 1058608

Abstract A rock bit has a rotary cutter cone journaled on a fixed journal bearing shaft with the radial load being taken by a cylindrical journal bearing. She friction bearing portion of the fixed shaft has a groove extending around the periphery of the shaft. The groove is filled with a bearing metal over an arc on the lower load bearing fraction of the shaft. the retaining unfilled portion of the groove is connected through a lubricant supply passage in the bit body with a pressure-compensated grease reservoir in the bit body, to supply lubrication to the journal bearing.

277436

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