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Rock bit cutter retainer
申请号	EP97308197.9	申请日	1997-10-16	公开(公告)号	EP0837215A3	公开(公告)日	1999-03-17
申请人	CAMCO INTERNATIONAL INC.;			发明人	Price, Randall R.;
摘要	A novel split threaded ring bearing member (42) for rolling cutter drill bits with at least a portion of its threads (48) having a different pitch than its mating threads (40) is disclosed. The pitch difference is designed so that the threaded ring can be seated or otherwise located precisely with respect to the other bearing elements within the drill bit to effectively control the axial displacement of the rolling cutter (18) on the bearing spindle (16) within a given tolerance range. Upon assembly, the difference in thread pitch causes the opposite, opposing mating thread flanks to engage, effectively applying a tensile or compressive force to a portion of the threaded ring bearing member (42), which gradually increases as the assembly is tightened. The result is an improved rolling cutter drill bit with a threaded ring cutter bearing system with excellent resistance to back-off which will not allow significant radial movement between the engaged threads, even if some back-off of the threads occurs.
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