Single energizer face seal for rock bits with floating...

Details Single energizer face seal for rock bits with floating... Single energizer face seal for rock bits with floating...

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/22 (2006.01) F16C 33/74 (2006.01) F16J 15/34 (2006.01)

Patent

CA 2292114

The present invention is a self adjusting, volume balanced, single energizer rigid face seal for rolling cutter drill bits with floating journal bearings. Volume balancing is accomplished by utilizing a floating static seal between the rigid face seal ring and the bearing shaft. This floating static seal ring is moved axially within a annular groove by the volume pulses caused by the axial play of the cutter when in operation. At one end of the annular groove the geometry of the rigid seal ring and bearing shaft are set such that the seal assembly achieves volume balance when the bearing is running on its OD. If the bearing is running on its OD, the floating static seal will move from where ever it is in the annular groove by the volume pulses until it reaches the balance volume position.

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