ROCK BIT WITH A THERMAL INSULATING SEAL RING POSITIONED IN THE SEAL GLAND

摘要

A rock bit includes a shaft and a cone mounted for rotation about the shaft at a journal bearing. A seal gland for the rock bit is defined at least by the shaft and the cone. A compressible seal ring is positioned within the seal gland. A thermal insulating ring is installed within the seal gland and positioned between the compressible seal ring itself and the journal bearing to insulate the compressible seal ring from heat radiating from the journal bearing.