Rotary bit bearing system

Details Rotary bit bearing system Rotary bit bearing system

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01)

Patent

CA 1172243

ABSTRACT OF THE DISCLOSURE Discloses a rotary bit bearing system for each cutter cone of a bit including ball bearings rotatably supporting the cone around a leg journal, a lateral sleeve bearing rotatably supporting the cone including a freely rotatably cylindrical composite sleeve bearing mounted between an inner bearing face and an outer bearing face. The composite sleeve comprises a first cylindrical sleeve member, a second cylindrical sleeve member, and a spacer disc thrust member mounted in freely rotatable relation between the first and second sleeve members. Also includes a disc thrust bearing rotatably supporting the cone to withstand axial forces in- cluding an external disc bearing, an internal disc bearing, and an intermediate disc bearing mounted in freely rotatable relationship between the external and the internal disc bearing with the intermediate disc bearing means including radial guide means to radially guide the internal and the external disc bearing. All bearing surfaces may be provided with dis-similar metal in sliding contact.

404935

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