Earth boring bit with pressure compensating bearing seal

Details Earth boring bit with pressure compensating bearing seal Earth boring bit with pressure compensating bearing seal

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01)

Patent

CA 1218643

ABSTRACT An earth boring bit having a pressure compensating seal assembly which includes a resilient packing ring, a rigid backup ring and a wave spring to permit axial displacement of the resilient ring in an elongated seal groove while re- sisting destructive distortions of the resilient ring. The lubrication system has a lubricant volume correlated with the volume of the passages and spaces and the maximum seal displacement. A measured amount of lubricant is withdrawn from the system during assembly for subsequent compression as the bit is lowered into a liquid-filled bore hole to position the seal assembly intermediate the end walls of the seal groove.

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