The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2012
Filed:
May. 06, 2009
Mahavir Nagaraj, Spring, TX (US);
Jeremy Marcus, The Woodlands, TX (US);
Vincent Wayne Shotton, Broken Arrow, OK (US);
Sameer Bhoite, Conroe, TX (US);
Mahavir Nagaraj, Spring, TX (US);
Jeremy Marcus, The Woodlands, TX (US);
Vincent Wayne Shotton, Broken Arrow, OK (US);
Sameer Bhoite, Conroe, TX (US);
Sandvik Intellectual Property AB, Sandviken, SE;
Abstract
A thrust bearing system for a roller cone rock bit includes at least one roller cone disposed on a leg having an air channel therethrough, the thrust bearing system including a primary thrust bearing surface on the leg configured to contact a corresponding primary bearing surface on the roller cone, wherein the primary thrust bearing surface on the leg includes at least one air circulation port in fluid communication with the air channel. The thrust bearing system further includes a secondary thrust bearing surface on the leg configured to contact a corresponding secondary bearing surface on the roller cone, wherein the secondary thrust bearing surface on the leg includes at least two air circulation ports located at specified locations in the secondary bearing surface and in communication with the air channel, and wherein a first circulation port is located in an upper half of the secondary thrust bearing surface and a second circulation port is located in a lower half of the secondary thrust bearing surface.