Bearings – Rotary bearing – Water lubricated propellor shaft or well shaft
Patent
1990-11-29
1991-08-06
Hannon, Thomas R.
Bearings
Rotary bearing
Water lubricated propellor shaft or well shaft
384 95, 3849071, 175107, E21B 402
Patent
active
050372122
ABSTRACT:
A bearing assembly for a downhole motor comprising a pair of annular support rings, each having a plurality of polycrystalline diamond thrust bearing inserts mounted thereon. The rings are oriented to have the respective inserts face and bear against each other. In operation, drilling mud passes through the space between the inserts to cool the inserts. The rings are made of tungsten carbide to prevent erosion of the areas at the bases of the inserts, thereby improving the life of the thrust bearings.
REFERENCES:
patent: T102901 (1983-04-01), Offenbacher
patent: 4410054 (1983-10-01), Nagel et al.
patent: 4468138 (1984-08-01), Nagel
patent: 4620601 (1986-11-01), Nagel
patent: 4708496 (1987-11-01), McPherson
patent: 4720199 (1988-01-01), Geczy et al.
patent: 4729440 (1988-03-01), Hall
patent: 4732491 (1988-03-01), Geczy
patent: 4756631 (1988-07-01), Jones
patent: 4789251 (1988-12-01), McPherson et al.
patent: 4802539 (1989-02-01), Hall et al.
Cross George A.
Justman Dan B.
Hannon Thomas R.
Smith International Inc.
Vargo Robert M.
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