Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft
Patent
1995-08-29
1997-05-13
Dang, Hoang C.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
175229, 175371, 384 93, E21B 1022
Patent
active
056283750
ABSTRACT:
A rolling cutter drill bit comprises a main body and three depending legs, each leg having a cantilevered bearing spindle on which a rolling cutter is rotatably mounted. Bearings located between the cutter and spindle include a radial bearing, and a thrust bearing configured to carry onward thrust loads from the cutter onto the spindle. A bearing seal defines an enclosed region between the cutter and the spindle in which the bearings are located, and a pressure balanced lubricant delivery system within the spindle delivers lubricant to the bearings. The lubricant delivery system includes a non-return valve to allow lubricant to flow into the area of the enclosed region containing the thrust bearing and the area is bounded by a tortuous flow path which allows a more restricted flow of lubricant out of the thrust bearing area and into another area of the enclosed region, without pressurizing the bearing seal. The non-return valve may be replaced by a flexible barrier ring in the tortuous path which deflects to allow a greater flow of lubricant into the thrust bearing area.
REFERENCES:
patent: 1896231 (1933-02-01), Fletcher
patent: 1909128 (1933-05-01), Scott et al.
patent: 2906504 (1959-09-01), Parks
patent: 3137508 (1964-06-01), Cunningham
patent: 3244459 (1966-04-01), Ortloff
patent: 3251634 (1966-05-01), Dareing
patent: 3841422 (1974-10-01), Crow
patent: 3844364 (1974-10-01), Crow
patent: 3866695 (1975-02-01), Jackson
patent: 4167219 (1979-09-01), McQueen
patent: 4181185 (1980-01-01), Keller et al.
patent: 4183416 (1980-01-01), Walters
patent: 4240674 (1980-12-01), Evans
patent: 4390072 (1983-06-01), Phelan
patent: 4412590 (1983-11-01), Daly
patent: 4446933 (1984-05-01), Bodine
patent: 4452323 (1984-06-01), Daly
patent: 4501338 (1985-02-01), Underwood
patent: 5099932 (1992-03-01), Hixon
patent: 5188462 (1993-02-01), Hooper et al.
patent: 5265964 (1993-11-01), Hooper
Camco International Inc.
Dang Hoang C.
LandOfFree
Thrust face lubrication system for a rolling cutter drill bit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thrust face lubrication system for a rolling cutter drill bit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thrust face lubrication system for a rolling cutter drill bit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1379207