Earth boring bit with eccentrically machined bearing pin

Details Earth boring bit with eccentrically machined bearing pin Earth boring bit with eccentrically machined bearing pin

E - Fixed Constructions

21

B

76/21, 255/77

E21B 10/00 (2006.01) E21B 10/22 (2006.01)

Patent

CA 1095505

EARTH BORING BIT WITH ECCENTRICALLY MACHINED BEARING PIN Abstract of the Disclosure A rolling cone cutter earth boring bit is provided with an improved bearing system including reduced clearance bearing surfaces 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 outer bearing surface of the bearing pin is provided by forming a recess in the load surface of the bearing pin and filling the recess with bearing material. The unloaded surface of the hearing pin is formed by eccentric machining. Reduced clearance is provided between the rolling cone cutter and the load surface of the bearing pin and increased clearance is provided between the rolling cone cutter and the unloaded surface. The clearance on the unloaded surface serves as a lubricant reservoir in close proximity to the load surface of the bearing pin.

329555

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