Dynamic air bearing seal - radially and axially stabilized

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member

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277 3, 277 59, F16J 1540

Patent

active

040531627

ABSTRACT:
An air bearing is coaxially mounted around a rotatable shaft, such as an engine crankshaft, by means of a bellows-like tube or resilient material. Air flows through the tube into an air chamber partly formed by a bearing sleeve to the bearing face. The bearing sleeve is concentrically received within and spaced from a double flange thrust sleeve which is mounted on a shaft by a plurality of "O"-ring seals. A plurality of air jets in both axial and the radial direction allow co-action of both thrust sleeves by means of the air flow therebetween. Stabilizing of the seal is provided by the air jets. Small, flexible lip seals on opposite faces of the bearing sleeve are lifted away from contact with the double flange sleeve when the shaft is rotating, thereby minimizing lip seal wear. The bearing seal provides streams of air which flow past the seal to prevent oil or contaminants from moving in a direction opposite to the air flow direction.

REFERENCES:
patent: 3575426 (1971-04-01), Durham
patent: 3815926 (1974-06-01), Vore

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