Patent ID: 6406030
Filing Date: 2002-06-18
Classification: E21B,F16J,Y10S

Abstract:
A journal seal for use with a rotary cone rock bit comprising:a flexible and resilient seal body formed from an elastomeric material selected from materials consisting of highly-saturated nitrile elastomers, nitrile-butadiene rubber, highly-saturated nitrile-butadiene rubber, and mixtures thereof; and a seal dynamic surface along one surface area of the seal body, and a seal static surface along another surface area of the seal body each formed from the elastomeric material, wherein the elastomeric material further comprises a lubricant additive to reduce friction and stick slip at the seal dynamic surface that is formed from hexagonal boron nitride; wherein the hexagonal boron nitride has an average particle size in the range of from about 0.1 to 20 micrometers.