Micropore engagement surfaces for earth boring bit

Details Micropore engagement surfaces for earth boring bit Micropore engagement surfaces for earth boring bit

2007-07-10

2007-07-10

Footland, Lenard A. (Department: 3682)

Bearings

Rotary bearing

Roller drill bit

Reexamination Certificate

active

11003132

ABSTRACT:
An earth boring bit has sliding engaging surfaces between a cone assembly and a bearing pin. Micropores are formed in at least one of the engaging surfaces. Each of the micropores has a leading portion and a trailing portion. The leading portion is at a more gradual slope than the trailing portion. The micropores are located in a pattern of a greater density in a region of the engaging surfaces that operate at higher pressures than in other regions.

REFERENCES:
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ASME Journal of Tribology, 121 (1999), 927-932,Effect of Pore Ensemble Statistics on Load Support of Mechanical Seals With Pore-Covered Faces, by Dr. Leonid Burstein and Dr. Dov Ingman, pp. 1-17.
Wear Results in Laboratory Tests, two pages, nor date.
Seal Interface Tribological Modeling, pp. 106-125, no date.

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