Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Dan E. Scott0
Don Q. Nguyen0
Eric Sullivan0
Scott Shiqiang Shu0
Terry J. Kolterman0
Timothy Nathan Sexton0
Anton F. Zahradnik0
Chih Lin0
...
Date of Patent
January 4, 2011
0Patent Application Number
121212960
Date Filed
May 15, 2008
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A rock drilling bit having PDC radial bearings has journal and cone bearing surfaces with increased contact area to increase load support. The radius of curvature of the bearing pin journal and cone bearing surfaces are matched or conformed on the bearing pressure side. The conformal journal surfaces may be formed on the main journal bearing, the pilot pin radial bearing, or both surfaces. In addition, diamond inlays may be located on the bearing surfaces of the cone, the bearing pin, or both components.
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