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Principles of naval engineering - Historic Naval Ships Association

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Chapter 23. -GAS TURBINEand housing accessory drive gears and reductiongears. The accessory drive section <strong>of</strong> a gasturbine engine is shown in figure 23-14.The gear train is driven by the engine rotorthrough an accessory drive shaft gear coupling.The reduction gearing within the case providessuitable drive speeds for each engine accessoryor component. Because the operating rpm <strong>of</strong> therotor is so high, the accessory reduction gearratios are relatively high. The accessory drivesACCESSORY DRIVEIDLER SHAFTACCESSORY DRIVEGEAR AND DRIVESHAFTACCESSORY DRIVEIDLER GEARSTARTER-GENERATODRIVESHAFTPINION SHAFTBEARINGRETAINERSLEEVEINPUT BEVELPINION ANDDRIVE SHAFTOIL PUMPDRIVE GEARUPPERHOUSINGOIL PUMPMAIN ACCESSORYDRIVE SHAFTOIL SUMPFigure 23-14.— Cutaway view <strong>of</strong> accessory drive section,147.148605

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