Rock bit bearing structure

Details Rock bit bearing structure Rock bit bearing structure

1977-02-15

1977-12-06

Song, Robert R.

Cutlery

308239, F16C 1906

Patent

active

040613763

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. The 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 remaining 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.

REFERENCES:
patent: 3746405 (1973-07-01), Welton
patent: 3765495 (1973-10-01), Murdoch
patent: 3866695 (1975-02-01), Jackson

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