Earth boring bit with shear compression seal

Details Earth boring bit with shear compression seal Earth boring bit with shear compression seal

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01) F16J 15/34 (2006.01)

Patent

CA 1253485

ABSTRACT OF THE DISCLOSURE An earth boring bit having a lubrication system that includes a pressure compensator and seals to confine lubricant within the bearings between rotatable cutters and shafts, the seals being of the asymmetrical shear/compression type, each half of which having a load deflection curve resulting from components satisfying the following criteria: DH > ApS and DC > ApS [(S-1)/S]1/2 Where: DH = Assembly deflection of shaft seal ring with bearing thrust faces in contact (in.); DC = Assembly deflection of cutter seal ring with bearing thrust faces in contact (in.); Ap = Axial cutter play (in.); S = Ratio seal to cutter movement. Also preferably DC ? DH[(S-1)/S]1/2

514554

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