O-ring seal for rock bit bearings

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

1994-03-11

1995-04-04

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175372, 175228, 384 94, 277 962, E21B 1024, F16C 3378

Patent

active

054028582

ABSTRACT:
An improved O-ring seal for rock bit bearings is formed from a resilient elastomeric composition comprising a multiplicity of low friction wear resistant particles distributed uniformly throughout the composition. The low friction wear resistant particles can have a rounded or non-rounded configuration. The low friction wear resistant particles located near the surface of the O-ring are exposed through wear of the elastomeric component to form wear pads that contact adjacent rotating rock bit sealing surfaces. The wear pads serve to reduce the break-off friction between the adjacent sealing surfaces and minimize the occurrence of stick-slip, thereby enhancing the service life of the O-ring seal and rock bit.

REFERENCES:
patent: 4194795 (1980-03-01), Rife
patent: 4344629 (1982-08-01), Oelke
patent: 4554985 (1985-11-01), Backlund
patent: 4557609 (1985-12-01), Moren
patent: 4588309 (1986-05-01), Uyehara et al.
patent: 5099519 (1991-04-01), Tatum

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