Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1977-11-07
1979-01-30
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175372, 308 82, E21B 908
Patent
active
041367480
ABSTRACT:
A roller-type rock bit has a body which fits into a drill hole and is provided with inwardly directed spindles about which cone-shaped cutters revolve. Between each spindle and its cutter is a tapered roller bearing, a flat thrust bearing, and a sleeve-type radial bearing arranged in that order from the large end of the cutter. The raceways of the tapered roller bearing converge toward the small end of the cutter, and that bearing is unitized by a thrust rib located on the spindle opposite the small ends of the rollers and a rib ring which fits into the cutter opposite the large diameter ends of the rollers. Thus, a major portion of the radial load encountered in drilling is taken by the tapered roller bearing, as well as a significant portion of the thrust load, with both of those loads being transferred between the raceways generally transversely through the tapered rollers. Any thrust loading in the opposite direction is transferred between the rib ring and the thrust rib generally axially through the rollers. The rib ring further closes the end of the cutter and, together with a stream of air that flushes the interior of the cutter, prevents rock cuttings from entering the cutter and damaging the bearings.
REFERENCES:
patent: 1858980 (1932-05-01), Behnke
patent: 2076000 (1937-04-01), Reed
patent: 2126040 (1938-08-01), Reed
patent: 3179189 (1965-04-01), Goodwin
patent: 3193028 (1965-07-01), Radzimovsky
patent: 3365247 (1968-01-01), Ferrand
patent: 3550972 (1970-12-01), Coski
patent: 3720274 (1973-03-01), McCallum
patent: 3847235 (1974-11-01), Goodfellow
Favreau Richard E.
Purser Ernest R.
The Timken Company
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