Earth-boring bit with improved bearing seal assembly

Details Earth-boring bit with improved bearing seal assembly Earth-boring bit with improved bearing seal assembly

1995-01-31

1996-06-11

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

277 95, 384 94, E21B 1022

Patent

active

055247180

ABSTRACT:
An earth-boring bit has a bit body, at least one cantilevered bearing shaft, including a base and a cylindrical journal bearing surface extending inwardly and downwardly from the bit body, and at least one cutter mounted for rotation on the cylindrical journal bearing surface of the bearing shaft. A seal assembly is disposed between the cylindrical journal bearing surface and the cutter proximally to the base of the cantilevered bearing shaft. The seal assembly includes at least one resilient sealing ring which is formed of a carboxylated hydrogenated acrylonitrile butadiene rubber.

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