Earth boring bit with axially radiussed roller bearing race

Details Earth boring bit with axially radiussed roller bearing race Earth boring bit with axially radiussed roller bearing race

E - Fixed Constructions

21

B

255/63

E21B 10/00 (2006.01)

Patent

CA 2034625

ABSTRACT OF THE DISCLOSURE A bearing shaft roller race that is axially radiussed to have a crowned region underneath the outer end of the roller to minimize abrupt change in the stress imposed upon the race by the ends of the roller to reduce spalling. The crowned region is tapered beginning about 1/4 inch from the end of the rollers. The taper is about 0.0005 inch deep at a location on the roller race underneath the outermost end of the roller. The taper is a radius which is tangent to the roller race.

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