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

1983-12-09

1985-05-28

Footland, Lenard A.

Bearings

Rotary bearing

Roller drill bit

F16C 3374

Patent

active

045197199

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 resisting 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 A measured amount of lubricant is withdrawn from the system during assembly for subsequent compression as the bit is lowered into a liquid-filled bore hole to position the seal assembly intermediate the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.

REFERENCES:
patent: 4014595 (1977-03-01), Dolezal
patent: 4019785 (1977-04-01), Stinson
patent: 4176848 (1979-12-01), Lafuze
patent: 4199156 (1980-04-01), Oldham et al.
patent: 4466621 (1984-08-01), Garner et al.

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