Gas turbine engine and shaft

The front fan of a ducted fan gas turbine engine is connected to the low pressure turbine of the gas generator by a shaft so as to be driven thereby. If the shaft breaks, air loads on the fan tend to pull it from the engine. It is known to provide a fail/safe shaft over and above the normal shaft wh...

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Bibliographische Detailangaben
Hauptverfasser:	DAVIES, KENNETH G
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL HEATING INDEXING SCHEME FOR ASPECTS RELATING TONON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES ORJET-PROPULSION PLANTS INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04 LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	The front fan of a ducted fan gas turbine engine is connected to the low pressure turbine of the gas generator by a shaft so as to be driven thereby. If the shaft breaks, air loads on the fan tend to pull it from the engine. It is known to provide a fail/safe shaft over and above the normal shaft which is retained at one end by some means and has a flange on its upstream end, to retain the fan via its disc. The invention obviates the heavy and expensive fail/safe shaft and substitutes a first annular shoulder 40 on the inner race of the fan bearing 20 and a further shoulder 42 on fixed structure 38. If the fan attempts to exit the engine, the two shoulders 40, 42 engage and so retain the fan.