Volume and pressure balanced rigid face seal for rock bits

Details Volume and pressure balanced rigid face seal for rock bits Volume and pressure balanced rigid face seal for rock bits

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01) F16J 15/34 (2006.01)

Patent

CA 1292221

ABSTRACT OF THE DISCLOSURE An earth boring bit having a rotatable cutter secured to a lubricated, cantilevered bearing shaft, sealed with an improved pressure compensating rigid face seal assembly. The assembly has a rigid rigid with a radial face that opposes and engages a radial face integral with a cutter seal groove. A resilient energizer ring is compressed between opposed conical surfaces, one on the rigid ring and the other in a shaft seal groove, to force the radial faces together. The periphery of the energizer ring is inside the journal bearing surface, which is ideally aligned with the mid-section of the ring, to define an essentially constant, lubricant filled, volume between the seal assembly and the shaft seal groove - even as the cutter and seal assembly move relative to the shaft during drilling. As a result, pressure variations in the vicinity of the seal assembly are minimized.

559906

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