Rock bit lubrication system

Details Rock bit lubrication system Rock bit lubrication system

1985-04-03

1986-07-01

Novosad, Stephen J.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

175372, 384 93, E21B 1022

Patent

active

045974551

ABSTRACT:
A sealed, pressure-equalizing lubrication system for a rotary rock bit is shown. The system includes a lubricant-filled container having an outlet and a portion of the container includes a flexible diaphragm. The container is mounted in a chamber in the journal axle portion of the bit, immediately adjacent and open to the sealed bearing cavity of the bit cutter, with the outlet disposed adjacent the cavity. A bleed hole is provided from the back face of the bit to the chamber adjacent the diaphragm causing the diaphragm to be responsive to the pressure of the external downhole fluid. The adjacency of the reservoir to the sealed bearing cavity permits the pressure of the lubricant adjacent the seal to be immediately responsive to the pressure of the downhole fluid at the diaphragm to prevent pressure differentials between the lubricant and the fluid at the seal.

REFERENCES:
patent: 2814465 (1957-11-01), Green
patent: 3230020 (1966-01-01), Gilbert et al.
patent: 3251634 (1966-05-01), Dareing
patent: 3307645 (1967-03-01), Hildebrandt
patent: 3845994 (1974-11-01), Trey
patent: 3923348 (1975-12-01), Peck
patent: 4199856 (1980-04-01), Farrow et al.

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