Earth boring bit with eccentric seal boss

Details Earth boring bit with eccentric seal boss Earth boring bit with eccentric seal boss

E - Fixed Constructions

21

B

76/21, 255/77

E21B 10/22 (2006.01) E21B 10/08 (2006.01) F16C 17/02 (2006.01)

Patent

CA 1132974

EARTH BORING BIT WITH ECCENTRIC SEAL BOSS Abstract of the Disclosure A rolling cone cutter earth boring bit is provided with a sealing system that results in the seal being squeezed uniformly around the seal circumference during drilling. The bearing pin seal surface is machined eccentrically to the bearing pin by an amount equal to the radial clearance of the bearing. The bearing pin seal surface is machined about an axis that is offset from the central axis of the bearing pin in the direction of the unloaded side of the bearing pin. When the bit is drilling and the bearing pin is loaded the seal will run on an axis concentric with the axis of the seal surfaces of the bearing pin and the rolling cutter and will see uniform squeeze around its circumference.

358530

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