Earth boring bit with eccentrically formed bearing surface

Details Earth boring bit with eccentrically formed bearing surface Earth boring bit with eccentrically formed bearing surface

E - Fixed Constructions

21

B

255/77

E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16C 17/10 (2006.01) F16C 33/10 (2006.01)

Patent

CA 1120917

EARTH BORING BIT WITH ECCENTRICALLY FORMED BEARING SURFACE Abstract of the Disclosure A rolling cone cutter earth boring bit is provided with an improved bearing system including a hardmetal bearing surface and a space for lubricant. At least one cantilevered bearing pin extends from the arm of the bit. A rolling cone cutter is rotatably mounted on the bearing pin. The primary bearing surface of the bear- ing pin is provided by forming a groove in the lower bear- ing surface of the bearing pin and filling a portion of the groove with bearing material to form the load carrying portion of the bearing pin. The groove is eccentric to the bearing pin central axis. Bearing material is applied in the groove and is machined to coincide with the bearing pin surface on the load side. Part of the groove is left unfilled. The unfilled portion of groove serves as a lubricant reservoir in close proximity to the load side of the bearing pin.

345921

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