Solid Lubricants for Helicopter Tail Rotor Gearboxes
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
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Solid lubricants as retainers in rolling bearings and as idlers for load gearswere evaluated in a Bell UH-1 helicopter tail rotor drive gearbox under normallubricated conditions and also under emergency conditions of dry operation.Solid lubricants provided satisfactory gearbox operation using conventionalfluid lubrication in all tests at output loads of 49 hp and 65 hp. Emergencydry operational life was extended from a limited 15 minutes, with conventionalbearings and gears, to 70 minutes using dry lubricant filled polyimide compositebearing retainers and a composite idler gear in the gearbox at a load of 65 hp.Operation at 49 hp in the emergency condition using the composites providedstable operation with no indication of failure during the 100-minute test.
- Lubricants and Hydraulic Fluids