Bearing and lubrication system for earth boring bit

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element

Reexamination Certificate

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Details

C175S228000, C175S337000, C384S092000, C384S094000, C384S095000

Reexamination Certificate

active

10948664

ABSTRACT:
Methods and apparatus for maintaining lubrication of rolling cone cutters mounted on journal pins. Embodiments comprise a rotating cone disposed on a journal pin and forming a journal gap there between. A cylindrical journal sleeve is disposed in the journal gap. The journal sleeve has a longitudinal gap forming opposing end portions, which are continuously contoured. A lubrication port is disposed in the journal pin and in fluid communication with a lubrication supply. The lubrication port has an outlet located in a recess in the journal gap. Each end of the recess comprises a transitioning surface extending between the bottom of the recess and the outer surface of the journal pin to prevent sharp transitions. In certain embodiments, the journal pin may comprise two or more lubrication ports, each located in a recess with transitioning surfaces.

REFERENCES:
patent: 3971600 (1976-07-01), Murdoch et al.
patent: 4199856 (1980-04-01), Farrow et al.
patent: 4280571 (1981-07-01), Fuller
patent: 6220374 (2001-04-01), Crawford
patent: 6869223 (2005-03-01), Azumi et al.

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