Thrust bearing and axial retainer system for rotary cone rock bi

Details Thrust bearing and axial retainer system for rotary cone rock bi Thrust bearing and axial retainer system for rotary cone rock bi

1985-06-06

1986-06-24

Footland, Lenard A.

Bearings

Rotary bearing

Roller drill bit

F16C 4302

Patent

active

045964726

ABSTRACT:
An improved retention and thrust bearing system for accurately retaining and locating a rotary rock cutter cone upon a journal shaft supported by a rock bit body is disclosed.
A rotary rock cutter cone is rotatively supported on a cooperating journal shaft by plain friction bearing means.
A pair of complimentary symmetrical and substantially rectangular annularly arranged grooves are formed in the bearing surfaces of both the rotary cutter and the journal shaft at matching positions intermediate the length of the friction bearing.
A multiplicity of retention and thrust bearing elements each having a thickness predetermined to substantially fill the mated grooves in intimate sliding relationship thereto, are assembled into the mated grooves via a small bore formed longitudinally within the journal shaft, having an entrance in the supported end of the cantilevered journal shaft and an exit intersecting the floor of the annular groove in the journal shaft. Each retention and thrust bearing element is moved laterally through the intersection of bore and groove into engagement with both of the aligned mating grooves, and when the selected number of bearing elements occupy the grooves then the intersection is operably closed to retain the bearing elements within the mating grooves.

REFERENCES:
patent: 2065740 (1936-12-01), Reed
patent: 2065741 (1936-12-01), Reed
patent: 4445791 (1984-05-01), Klima

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