Sealed lubricated and air cooled rock bit bearing

Details Sealed lubricated and air cooled rock bit bearing Sealed lubricated and air cooled rock bit bearing

1980-09-19

1983-06-07

Leppink, James A.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

384 94, E21B 1022

Patent

active

043866689

ABSTRACT:
An earth boring bit has features particularly for use in drilling holes in which compressed air is used as a drilling fluid. The bit has three rotatable cutters, each having a cavity for mounting on a depending bearing pin. The cutter and the bearing pin have a thrust bearing in the lower portion of the cavity and a roller bearing in the upper portion of the cavity. The bit has air passages for discharging through the roller bearing gaseous fluid pumped from the surface. A seal seals the nose area from the roller bearing area. Liquid lubricant is located in the nose area for lubricating the bearing surfaces in this portion of the bit. A lubricant chamber is in communication with the nose area. The lubricant chamber cavity has a sliding piston for applying pressure to the lubricant. The sliding piston is driven by the compressed air in the air passages.

REFERENCES:
patent: 1909128 (1933-05-01), Scott et al.
patent: 2814465 (1957-11-01), Green
patent: 2906504 (1959-09-01), Parks
patent: 3048230 (1962-08-01), Angel
patent: 3244459 (1966-04-01), Ortloff
patent: 3251634 (1966-05-01), Dareing
patent: 3845994 (1974-11-01), Trey
patent: 3921735 (1975-11-01), Dysart
patent: 4183416 (1980-01-01), Walters
patent: 4194794 (1980-03-01), Kling
patent: 4274498 (1981-06-01), Penny

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