Rotary bearing seal for drill bits

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member

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Details

308 82, 175371, F16J 1516

Patent

active

041768485

ABSTRACT:
A rolling cone cutter earth boring bit is provided with a seal assembly for sealing the bearings of the bit from the abrasive materials in the borehole and retaining lubricant within the bearing area. A rolling cone cutter is rotatably mounted on a cantilevered bearing pin extending from the bit body. A first seal receiving surface is located on said bearing pin. The first seal receiving surface has a first corner. A second seal receiving surface is located on said rolling cone cutter. The second seal receiving surface has a second corner. The seal assembly includes first and second seal units. The first seal unit comprises a first annular substantially rigid ring and a first substantially resilient ring positioned between said bearing pin and said rolling cone cutter. The first resilient ring is positioned in said first corner. The second seal unit comprises a second annular substantially rigid ring and a second substantially resilient ring positioned between said bearing pin and said rolling cone cutter. The second resilient ring is positioned in said second corner. The sliding interface between said first and second annular substantially rigid rings is inclined with respect to said bearing pin. The first and second substantially rigid rings are made of materials such as Teflon, nylon, plastic, metal or other substantially rigid materials.

REFERENCES:
patent: 3656764 (1972-04-01), Robinson
patent: 3761145 (1973-09-01), Schumacher
patent: 4087100 (1978-05-01), Yoshihashi

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