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

E - Fixed Constructions

21

B

255/73

E21B 10/00 (2006.01) E21B 10/24 (2006.01)

Patent

CA 1138421

ABSTRACT OF THE DISCLOSURE 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 cut- ters, 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 lubri- cating 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.

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