Timothy J Sexton

US Patent:

7861805, Jan 4, 2011

Filed:

May 15, 2008

Appl. No.:

12/121296

Inventors:

Aaron J. Dick - Houston TX, US
Chih Lin - Spring TX, US
Terry J. Kolterman - The Woodlands TX, US
Anton F. Zahradnik - Sugar Land TX, US
Dan E. Scott - Montgomery TX, US
Don Q. Nguyen - Houston TX, US
Eric Sullivan - Houston TX, US
Scott Shiqiang Shu - Spring TX, US
Craig Hodges Cooley - Saratoga Springs TX, US
Timothy Nathan Sexton - Santaquin UT, US

Assignee:

Baker Hughes Incorporated - Houston TX
US Synthetic Corporation - Orem UT

International Classification:

E21B 10/22

US Classification:

175371, 175372

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.

US Patent:

8028770, Oct 4, 2011

Filed:

Nov 17, 2010

Appl. No.:

12/947934

Inventors:

Aaron J. Dick - Houston TX, US
Chih Lin - Spring TX, US
Terry J. Koltermann - The Woodlands TX, US
Anton F. Zahradnik - Sugarland TX, US
Daniel E. Scott - Montgomery TX, US
Don Q. Nguyen - Houston TX, US
Eric Sullivan - Houston TX, US
Scott Shiqiang Shu - Spring TX, US
Craig Hodges Cooley - Saratoga Springs UT, US
Timothy Nathan Sexton - Santaquin UT, US

Assignee:

Baker Hughes Incorporated - Houston TX

International Classification:

E21B 47/01

US Classification:

175372

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.