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

1987-03-09

1988-06-28

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

277 92, E21B 1024

Patent

active

047533048

ABSTRACT:
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 ring 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 a essentially constant, lubricant filled, volume between the seal assembly and the shaft seal groove--even as the cutter and seal assembly move relatively to the shaft during drilling. As a result, pressure variations in the vicinity of the seal assembly are minimized.

REFERENCES:
patent: 3761145 (1973-09-01), Schumacher, Jr.
patent: 4172502 (1979-10-01), van Nederveer
patent: 4306727 (1981-12-01), Deane et al.
patent: 4466622 (1984-08-01), Deane et al.
patent: 4516640 (1985-05-01), Karlsson
patent: 4598778 (1986-07-01), Highsmith
patent: 4610319 (1986-09-01), Kalsi
patent: 4623028 (1986-11-01), Murdoch et al.
patent: 4629338 (1986-12-01), Ippolito
patent: 4666000 (1987-05-01), Evans
patent: 4666001 (1987-05-01), Burr

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