Magnetic face seal for rock drill bit bearings

Details Magnetic face seal for rock drill bit bearings Magnetic face seal for rock drill bit bearings

2007-09-11

2007-09-11

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S374000, C277S378000

Reexamination Certificate

active

11212244

ABSTRACT:
A seal assembly for an earth boring bit uses a magnet to provide a desired contact force. The seal is located between a rotating cone and a stationary bearing pin of the drill bit. The seal has a non rotating metal face that is in sliding engagement with a seal face in the cone that rotates with the cone. The non rotating seal face is provided by a carrier ring that encircles the bearing pin. A magnet is mounted to the carrier ring to provide an attraction force maintaining the carrier ring in contact with the rotating seal face in the cone. An elastomeric seal ring seals between the carrier ring and the bearing pin to prevent rotation of the carrier ring.

REFERENCES:
patent: 5078411 (1992-01-01), Geco
patent: 5730447 (1998-03-01), Dawson et al.
patent: 6401843 (2002-06-01), Besson et al.
patent: 6684966 (2004-02-01), Lin et al.
patent: 6805358 (2004-10-01), Dawson et al.
patent: 1687761 (1991-10-01), None

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