The feasibility of operating a mainshaft thrust bearing at high speeds with jet fuel mist as the coolant and lubricant has been demonstrated in both rig and engine testing. A split-inner ring hybrid thrust bearing ( silicon nitride balls ) was successfully operated to 1.67 x 106 DN at maximum Hertzian contact stresses up to 322,000 psi. The bearing configuration also included BG-42 inner and outer rings and a Dupont polyimide Vespel separator. The incorporation of a fuel lubrication system for limited-life turbine engines has many advantages, including; The bearing has been subjected to a variety of hostile tests, including; This paper describes the development history, including rig and engine testing, as well as the analytical challenges overcome in designing the hybrid configuration.
A High-Speed Fuel Lubricated Hybrid Thrust Bearing for Limited-Life Turbine Engines
Sae Technical Papers
Aerospace Technology Conference and Exposition ; 1990
01.09.1990
Aufsatz (Konferenz)
Englisch
A WATER LUBRICATED HYBRID THRUST BEARING: MEASUREMENTS AND PREDICTIONS OF STATIC LOAD PERFORMANCE
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