Boring or penetrating the earth – Natural vibration characteristic of an element of boring...
Patent
1979-04-06
1981-03-17
Pate, III, William F.
Boring or penetrating the earth
Natural vibration characteristic of an element of boring...
175227, E21B 1022
Patent
active
042561906
ABSTRACT:
A roller cone drill bit which is supported for rotation on a bearing pin by means of a journal bearing is sonically driven, preferably by means of a resonant vibration system formed in an elastic column which receives vibratory energy from an orbiting mass oscillator. The roller cone also is mechanically rotated by virtue of conventional rotary motion of the drilling string. Enough clearance is provided at the journal bearing between the bearing pin and the roller cone to provide a thick film of lubricating oil at this bearing. The energy provided at the bearing from the resonant vibration system, in view of its periodically reversing high G acceleration short time duration force pulses, effectively operates to increase the gap in the lower portions of the journal bearing between the bearing pin and the roller cone during the "upward" acceleration of the sonic vibration cycle causing the lubricant to run from the upper portions of the bearing down to the lower portions thereof where the lubricant builds up so that when the "downward" portion of the cycle occurs there will be an ample oil film in these lower portions to provide the needed lubrication.
REFERENCES:
patent: 3096833 (1963-07-01), Bodine
patent: 3244459 (1966-04-01), Ortloff
patent: 3746405 (1973-07-01), Welton
patent: 3761145 (1973-09-01), Schumacher, Jr.
patent: 3890018 (1975-06-01), Clamon
Pate III William F.
Sokolski Edward A.
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