초록 ▼

O-ring seals for rock bit bearings comprise a body formed from an elastomeric material having one or more lubricant additive uniformly distributed throughout to reduce the coefficient of friction and stick slick amplitude at O-ring seal surfaces. The lubricant additives are selected from the group c

O-ring seals for rock bit bearings comprise a body formed from an elastomeric material having one or more lubricant additive uniformly distributed throughout to reduce the coefficient of friction and stick slick amplitude at O-ring seal surfaces. The lubricant additives are selected from the group consisting of polytetrafluoroethylene, hexagonal boron nitride, flake graphite, ultra-high molecular weight polyurethane, and mixtures thereof. O-ring seals made from elastomeric compositions of this invention comprise in the range of from about 85 to 99 percent by volume elastomeric material, and in the range of from about 1 to 15 percent by volume of the lubricant additives based on the total volume of the composition.

대표청구항 ▼

1. 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

1. 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.