05368398 is referenced by 174 patents and cites 13 patents.

The invention concerns a diamond bearing assembly for a downhole motor. The assembly (10) includes at least one set of opposing, relatively rotating thrust bearing rings (20, 22) each of which includes an annular support element (24, 30) and PCD compacts (26, 32) carried by the support elements. The PCD compacts of the bearing rings oppose one another at a thrust bearing interface (80). Shear limiting means (96, 110) are provided. These means are arranged to shear if frictional forces between the opposing PCD compacts at the thrust bearing interface exceed a critical level. This eliminates relative rotation between the bearing rings and avoids possible overheating and thermal degradation of the PCD. The shear limiting means can also serve as an alignment means to ensure correct axial alignment of the bearing components. The bearing assembly may also include a compact radial bearing capability.

Title
Diamond bearing assembly
Application Number
8/142042
Publication Number
5368398
Application Date
October 28, 1993
Publication Date
November 29, 1994
Inventor
Klaus Tank
Transvaal
ZA
Oliver F R A Damm
Transvaal
ZA
Agent
Oblon Spivak McClelland Maier & Neustadt
Assignee
CSIR
ZA
IPC
F16C 17/04
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