Back to results
US 4,720,199 AGranted
Bearing structure for downhole motors
AssigneeSmith International, Inc.
InventorsBela Geczy, James N. McPherson, Robert G. Toth
Life of this patent
Estimating the term…
Abstract
A unitary sleeve mounts both thrust and radial bearings, the radial bearing being fabricated of macro-crystalline tungsten carbide powder and cemented tungsten carbide cobalt chips in a recessed area on an elongated extension and the thrust bearing comprising a ring carrying diamond inserts residing in through holes, the ring and inserts being brazed on a hub at the thrust head end of the extension.
Claims2
A bearing structure for mounting to a drive shaft comprising:
- a generally cylindrical unitary bearing sleeve having an annular surface at one end thereof said annular surface being positioned concentrically about the axis of said cylindrical unitary bearing sleeve;
- a radial bearing surface attached to said sleeve, said radial bearing surface comprising a blend of macro-crystalline tungsten carbide powder and cemented tungsten carbide cobalt chips in a copper base infiltrant;
- a generally planar retainer ring having a number of through holes therein;
- a plurality of polycrystalline diamond faced thrust bearing inserts, one mounted in each of said through holes;
- and
- brazing material rigidly bonding said ring and said inserts to said annular surface, concentric with said axis, and rigidly bonding said inserts to said ring.
3 more elements
A bearing structure adapted for mounting to a drive shaft comprising:
- a unitary bearing sleeve for attachment to said drive shaft having an elongated recessed cylindrical outer surface of a first diameter, said sleeve widening in thickness beyond said recessed area to form a thrust head having an annular end surface with a cylindrical hub extending therefrom;
- a generally cylindrical radial bearing attached to said sleeve in said recessed cylindrical area, said radial bearing comprising a blend of macro-crystalline tungsten carbide powder and cemented tungsten carbide cobalt chips in a copper base infiltrant;
- a generally planar annular retainer ring having a plurality of through holes therein, said ring having a cylindrical center opening, said opening fitting over said hub;
- a plurality of polycrystalline diamond faced thrust bearing inserts one mounted in each of said through holes;
- and
- brazing material rigidly bonding said ring and said inserts to said annular surface of said thrust head and rigidly bonding said inserts to said ring.
3 more elements
Dependencies are inferred from the claim text.