Earth boring bit with improved thrust bearing

Details Earth boring bit with improved thrust bearing Earth boring bit with improved thrust bearing

1992-07-30

1994-05-03

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

384 92, 384 93, 384 94, E21B 1022

Patent

active

053078870

ABSTRACT:
An earth boring bit having a body and a cantilevered bearing shaft extending inwardly and downwardly from the body. A rotatable cutter with an open end is assembled over the shaft, which has a radial bearing surface formed around a longitudinal axis. The cutter has a radial bearing surface sized to permit assembly over the journal surface of the shaft. The shaft and cutter have opposed thrust bearing surfaces, one of which has a gradually tapered outer region and a planar inner region to gradually reduce peak stress from a maximum to a minimum and avoid abrupt changes in stress from a high to a low value.

REFERENCES:
patent: 3397928 (1968-08-01), Galle
patent: 3656764 (1972-04-01), Robinson
patent: 4157122 (1979-06-01), Morris
patent: 4516641 (1985-05-01), Burr
patent: 4554985 (1985-11-01), Backlund
patent: 4588309 (1986-05-01), Uyehara et al.
patent: 4753304 (1988-06-01), Kelly
patent: 4899838 (1990-02-01), Sullivan et al.

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