F - Mech Eng,Light,Heat,Weapons – 16 – C
Patent
F - Mech Eng,Light,Heat,Weapons
16
C
308/5.5
F16C 37/00 (2006.01) E21B 10/18 (2006.01) E21B 10/22 (2006.01)
Patent
CA 1167088
ABSTRACT OF THE DISCLOSURE An earth boring bit has a friction or journal bearing with features that allow cooling fluid to be circulated near the bearing. The bit is of the type having rotatable cutters carried by depending bearing pins. A bushing is stationarily mounted on the bearing pin, with the bushing's inner surface in contact with the outer surface of the bear- ing pin. One of the surfaces has a plurality of grooves that extend at least partially around the bearing pin. Passages are formed in the bearing pin and bit for cir- culating cooling fluid through the grooves. The cutter is mounted on the bushing in rotating and sliding contact to form a journal bearing.
391827
Gowling Lafleur Henderson Llp
Hughes Tool Company
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