Abstract: The accessory drive unit, mounted intermediate an engine and a transmission, provides mounts for a water pump, an alternator, a supercharger and a starter. The accessory drive unit includes a main planetary gear driving a supplemental gear which is rotatably interconnected to a bevel gear driving a supercharger shaft. A first pilot gear is rotatably coupled to the main gear and is coaxially mounted to a second pilot gear. A water pump gear is rotatably coupled to the second pilot gear. An alternator gear is rotatably coupled to the first pilot gear. A flywheel is mounted on the engine drive shaft and has a peripheral gear thereon. The starter has a geared drive shaft which is adapted to rotatably interlink with the peripheral gear on the flywheel.

Abstract: The integrated bell housing on an engine, carries a supercharger, an alternator, a water pump and a starter. The engine has a crankshaft which is coupled to a flywheel in the casing as is a geared transmission. The flywheel has a first gear and a second gear. The first gear drives a supercharger drive shaft which drives the supercharger. The second gear is coupled to an alternator drive shaft such that the flywheel drives the alternator. A water pump drive shaft is keyed to the crankshaft and is rotatably mounted through the bell housing.