Drilling bit bearing structure

Details Drilling bit bearing structure Drilling bit bearing structure

1975-02-04

1977-05-03

Wood, Jr., M. H.

Cutlery

308239, 308DIG8, F16C 1900

Patent

active

040210847

ABSTRACT:
A rock drilling bit has a plurality of rolling cutters for pulverizing rock. The loads on the bearings between these cutters and their mounting pins are extreme and are carried by a friction bearing. The bearing surface in the cutter has a plurality of spaced apart pockets filled with a material harder that the carburized hardened steel of the balance of the bearing surface and having essentially zero ductility. Such a bearing surface is made by machining a plurality of shallow pockets in the cylindrical bearing surface either before or after carburizing. If formed before carburizing, the pockets are painted off to prevent carburizing in that area. Each of the pockets is then filled with the wear resistant hard material as a weld deposit. Finally, the steel body is hardened and the exposed steel portions of the bearing surface and wear resistant material are ground to form a finished bearing surface. Bearing life is increased substantially as compared with the best known prior bearing.

REFERENCES:
patent: 2200129 (1940-05-01), Whiteford
patent: 2517430 (1950-08-01), Hensel et al.
patent: 2971248 (1961-02-01), Kingsley et al.
patent: 3235316 (1966-02-01), Whanger
patent: 3823030 (1974-07-01), Hudson

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