Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Reexamination Certificate
2006-10-31
2006-10-31
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
C175S337000, C175S339000, C384S093000
Reexamination Certificate
active
07128171
ABSTRACT:
An earth boring bit has rotating cones with two lubricant passages to increase bearing capacity and cause lubricant circulation. A lubricant reservoir in the body supplies lubricant to passages between the cone and bearing pin. A pressure compensator equalizes lubricant pressure to the exterior of the bit. A first passage leads from the reservoir to the upper side of the bearing pin. A second passage leads from the reservoir to the bearing pin at a point from 185 degrees to 225 degrees as seen from an inner end of the bearing pin. This point is located in a diverging region51dof an annular clearance surrounding the bearing pin.
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Fundamentals of Fluid Film Lubrication, by Bernard J. Hamrock, The Ohio State University, Columbus, Ohio, Chapter 10, Hydrodynamic Journal Bearings-Analytical Solutions, pp. 217-229.
Dick Aaron J.
Lin Chih C.
Baker Hughes Incorporated
Thompson Kenneth
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