Unitized seal for severe service applications

Details Unitized seal for severe service applications Unitized seal for severe service applications

1984-06-20

1986-09-23

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175359, 277 92, E21B 1022

Patent

active

046130055

ABSTRACT:
The present invention is directed to a grit exclusion and oil retention seal for use in extremely hostile environments. These environments include, but are not limited to sealing oil within cavities forming parts of earth drilling bits and the like. Seals such as these, include the ability to seal oil within a cavity in a reliable manner even under extreme conditions of vibration, mechanical shock, and the presence of grit, sand, water, dirt and mixtures thereof. In order to function properly in this environment, the seal must also provide a certain amount of axial end play so that relative movement of the sealed parts will not permit the seal to leak.
In this connection, a heavy duty seal of the type with which the invention is concerned must provide not only a primary or relatively moveable seal, but also a secondary seal. The seal assembly must include means for transmitting torque from the housing or carrier to the primary seal rings. Means must be present for applying and maintaining an axial end face load of the proper range.

REFERENCES:
patent: 1862887 (1932-06-01), Durdin, Jr.
patent: 2559964 (1951-07-01), Jensen
patent: 3241843 (1966-03-01), Hatch et al.
patent: 3272519 (1966-09-01), Voitik
patent: 3279804 (1966-10-01), Blair
patent: 3572452 (1971-03-01), Winberg
patent: 3844363 (1974-10-01), Williams, Jr.
patent: 3909076 (1975-09-01), Kato
patent: 4509607 (1985-04-01), Saxman et al.

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