Sealing system for a rotary rock bit

Details Sealing system for a rotary rock bit Sealing system for a rotary rock bit

1978-12-21

1980-04-29

Stearns, Richard R.

Cutlery

3081871, 175372, F16C 3378, E21B 935

Patent

active

042003431

ABSTRACT:
A sealing system for a rotary rock bit retains lubricant inside the bit and acts as a barrier to the pulverized cuttings and other materials in the borehole to prevent the materials from entering the bearing area through the cone mouth opening of the rolling cone cutter. A protecting ring is positioned outside of an elastomer seal element. Both the protecting ring and the elastomer seal element are positioned in the cone mouth opening. The protecting ring is positioned in the cone mouth opening with a slight interference fit. This allows the elastomer seal element to be protected from the hostile drilling environment and increases seal life. The protecting ring retards materials in the borehole from contacting the seal element. The sealing system is provided without reducing the bearing capacity of the bit's bearing system.

REFERENCES:
patent: 3397928 (1968-08-01), Galle
patent: 3467448 (1969-09-01), Galle
patent: 3604523 (1971-09-01), Lichte
patent: 3656764 (1970-08-01), Robinson
patent: 3761145 (1973-09-01), Schumacher, Jr.
patent: 3944306 (1976-03-01), Neilson
patent: 4168868 (1979-09-01), Shields

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