E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/78
E21B 10/00 (2006.01) E21B 10/22 (2006.01) F16C 17/04 (2006.01) F16C 17/08 (2006.01) F16C 33/10 (2006.01)
Patent
CA 1059499
ABSTRACT OF DISCLOSURE A device for reducing friction between surface planes sliding against each other in axial thrust bearings between the shaft end and roller in rotary roller bits and rollers for rock and earth boring, especially at full size tunnel driving. A friction reducing groove is arranged excentrically in relation to the axes of the shaft end and the roller in at least one of the surface planes sliding against each other. Said groove is filled with material having a friction reducing and/or lubricating effect.
270515
Kangas Karl-Erik
Svanstrom Alf H.
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