Journal bushing drill bit construction

Details Journal bushing drill bit construction Journal bushing drill bit construction

1984-12-07

1986-02-25

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

384 94, 384 95, E21B 1022

Patent

active

045723060

ABSTRACT:
An earth boring drill bit having roller cutters which are rotatably supported on journals by bushings. At least one of the bushings is formed by a plurality of bushing segments which are positioned about a circular bearing surface having thrust shoulders at each end thereof. The roller cutter elements are assembled about the bushing segments in heated condition, by press-fitting to establish a firmly seated relationship between the cutter and bushing segments upon cooling of the cutter. The rotary cutter is then secured to the bushing segments by means of a locking element to prevent inadvertent disassembly during drilling operations. End portions of the bushing segments engage hardened bearing inserts of cutter support legs to minimize wear during drilling operations. A circular sealing element positioned about the bushing segments establishes sealing engagement with the cutter support legs to prevent ingress of contaminants and egress of lubricant during drilling activity.

REFERENCES:
patent: 3620580 (1971-11-01), Cunningham
patent: 3917361 (1975-11-01), Murdoch
patent: 4157122 (1979-06-01), Morris
patent: 4407375 (1983-10-01), Nakamura
patent: 4478299 (1984-10-01), Dorosz
U.S. Defensive Publication No. T102,901, Offenbacher, "Method of Fabricating a Bearing", 4-5-83, FIG. 4.

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