Plunger lubricant compensator for an earth boring drill bit

Details Plunger lubricant compensator for an earth boring drill bit Plunger lubricant compensator for an earth boring drill bit

E - Fixed Constructions

21

B

255/73

E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16N 23/00 (2006.01)

Patent

CA 1153360

ABSTRACT OF THE DISCLOSURE An earth boring drill bit has a lublicant pressure compensator that includes a plunger that moves slidingly in the reservoir to reduce pressure differential, and also allows lubricant to bleed past to relieve excess lubricant pressure. The plunger is carried slidingly in the reservoir. The plunger has a convex end in contact with the lubricant and a concave end in contact with the borehole fluid. The plunger has a rod that contacts a stop in the reservoir when the lubricant pressure is greater than the borehole pressure. Once stopped, the configuration of the plunger allows lubricant to bleed past the plunger to relieve excess lubricant pressure.

366811

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