Roller Cone Bit Bearing, and Bearing Materials
AssigneeBaker Hughes Incorporated
InventorsAnton F. Zahradnik, Terry J. Koltermann, Aaron J. Dick, Don Q. Nguyen, Eric C. Sullivan, Greg Ricks
Life of this patent
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Abstract
A journal bearing element for use in forming a roller cone bit coupled to a bearing shaft to prevent circumferential sliding. Also included are material compositions of the journal bearing element. A journal bearing element is fixed in place relative to a head section and comprised of dense high purity powdered metal alloys with uniform micro-structure. A preferred material is comprised of a metal made of a carbon content of about 2.3% by weight, chromium of about 14% by weight, vanadium of about 9% by weight, and molybdenum at about 1% by weight.
Claims20
An earth boring bit comprising:
- a bit body;
- a leg section depending from the body;
- a bearing shaft extending from the leg having a circular bearing surface having an indentation formed substantially aligned with the axis of the bearing shaft;
- a coupling element disposed in the indentation;
- a journal bearing element on the bearing shaft and joined to the coupling element thereby coupling the journal bearing element to the bearing shaft.
An earth boring bit comprising:
- a bit body;
- a leg section depending from the body;
- a bearing shaft extending from the leg having a circular bearing surface;
- and
- a journal bearing element formed separately from the bit and adhered to the bearing shaft.
An earth boring bit comprising:
- a bit body;
- a leg section depending from the body;
- a bearing shaft extending from the leg having a circular bearing surface;
- and
- a journal bearing element comprising an alloy, wherein the alloy includes at least about 3% by weight of vanadium.
Dependencies are inferred from the claim text.