Drill bit utilizing lubricant thermal expansion and relief valve

Details Drill bit utilizing lubricant thermal expansion and relief valve Drill bit utilizing lubricant thermal expansion and relief valve

1975-05-30

1977-04-26

Peters, Jr., Joseph F.

Cutlery

184 621, 308187, F16C 1900

Patent

active

040197859

ABSTRACT:
Disclosed herein is a drill bit for earth boring, including a lubrication system that eliminates necessity for a complex system to accomplish pressure compensation. Since the temperature of the earth generally increases with depth from the surface, a drill bit experiences increasing temperature with increasing depth. The coefficient of thermal expansion of lubricant inside a bit is greater than that of the metal defining the walls of the lubricant cavities. Internal bearing lubrication pressure control is achieved utilizing thermal expansion of the lubricant, seal displacement, and a pressure relief valve.

REFERENCES:
patent: 3721306 (1973-03-01), Sartor
Production Control Units Product Bulletin No. 105-A, 106-A published 12/28/66.

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