Journal bearing type rock bit

Details Journal bearing type rock bit Journal bearing type rock bit

E - Fixed Constructions

21

B

255/78

E21B 10/00 (2006.01) E21B 10/22 (2006.01) E21B 10/24 (2006.01)

Patent

CA 2009987

66235-77 ABSTRACT An improved journal bearing for rotary cone type mining or oilfield rock bits is disclosed. Such rock bits typically have several cutters each rotatably mounted on a cantilevered bearing pin. The cutter and respective bearing have complementary journal bearing surfaces. A retainer is provided at one end at the bear- ing surfaces for keeping the cutter on the bearing pin and a seal is provided at the opposite end. In addition to the usual axial thrust surface located towards the radially inner end of the bearing pin, one or more secondary axial thrust surfaces are provided in one embodiment of the invention. Alternatively, at least one series of grooves or other axial lubricant flow restric- tor is provided at the complementary bearing surfaces. The inven- tion greatly improves the load carrying capacity of the bearing.

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