Bearings – Rotary bearing – Roller drill bit
Patent
1990-08-13
1991-06-18
Footland, Lenard A.
Bearings
Rotary bearing
Roller drill bit
384 94, 384 96, F16C 1710
Patent
active
050245392
ABSTRACT:
A rotary rock cutter cone is rotatively supported while being axially located and retained on a cooperating cantilevered journal shaft depending from a rock bit body by plain friction bearing means.
A primary stationary thrust face is provided by a radially extending surface of the journal shaft adjacent the distal end of the journal shaft.
An annular ring, fitted about the journal shaft, forms a gland for housing a grease seal which impinges upon the journal shaft. A radially extending distal surface of the annular ring runs in cooperation with a radially extending stationary thrust face formed by a secondary thrust member. The secondary thrust member is axially secured to the journal shaft thus axially trapping the annular ring adjacent to the supported end of the journal shaft.
A radial bearing bore centrally enters the base of the cone and extends to a radially extending primary thrust bearing surface within the cone.
The annular ring is finally and rigidly secured within a counterbore formed about the bearing bore at the base of the cone.
REFERENCES:
patent: 4136748 (1979-01-01), Dickerhoff
patent: 4395076 (1983-07-01), Sabre
patent: 4555186 (1985-11-01), Scruggs
patent: 4903786 (1990-02-01), Welsh
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