Drill bit utilizing lubricant thermal expansion and relief...

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

E - Fixed Constructions

21

B

255/78

E21B 10/00 (2006.01) F16C 19/00 (2006.01)

Patent

CA 1043328

Abstract of the Disclosure 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 ther- mal 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 displace- ment, and a pressure relief valve. -2-

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