E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/78
E21B 10/20 (2006.01) E21B 10/22 (2006.01)
Patent
CA 1254552
ABSTRACT OF THE DISCLOSURE A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a journal bearing which is substantially frusto-conically shaped and a roller cone bearing which is reverse shaped to mate with the journal bearing. The invention also includes a means for maintaining the journal and roller cone bearing in compression against each other. In the preferred embodiment, the journal and roller cone bearings comprise polycrystalline diamond and the compression is maintained by a threaded bolt which is tightened to the point of putting the bolt in tension. In one preferred embodiment, the bolt is threaded into the cone and rotates in the center of the journal. In another preferred embodiment, the bolt is threaded into the leg or the journal and the cone rotates about it. In both of these embodiments, thrust bearings are located between the head of the bolt and the leg or cone surface contacted. The bolt's threads can either be locked in place, or allowed to self-tighten as the cone rotates during drilling.
498333
Megadiamond Industries Inc.
Ridout & Maybee Llp
LandOfFree
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