O-ring seal for rock bit bearings

Details O-ring seal for rock bit bearings O-ring seal for rock bit bearings

1992-05-15

1994-06-28

Dang, Hoang C.

Boring or penetrating the earth

Processes

175371, 277227, E21B 1022

Patent

active

053238630

ABSTRACT:
A dynamic O-ring seal for retaining the lubrication around a rock bit bearing for drilling subterranean formations has a composition comprising 100 parts by weight highly-saturated nitrile elastomer, furnace black in the range of from 40 to 70 parts by weight, peroxide curing agent in the range of from 7 to 10 parts by weight, graphite in the range of from 10 to 20 parts by weight, zinc oxide or magnesium oxide in the range of from 4 to 7 parts by weight, stearic acid in the range of from 0.5 to 2 parts by weight, and sufficient plasticizer to provide a Shore hardness no more than A 80.

REFERENCES:
patent: 3788654 (1974-01-01), Mandley
patent: 3917028 (1975-11-01), Garner
patent: 4614779 (1986-09-01), Watanabe et al.
patent: 4675362 (1987-06-01), Miyabashi et al.
patent: 4753304 (1988-06-01), Kelly, Jr.
patent: 4851068 (1989-07-01), Uyehara

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