Accessory drive assembly with compact gear differential

Claim 1

In a vehicle having an engine with a crankshaft, a transmission with an output shaft, and associated accessories with a drive shaft, an accessory drive assembly comprising a first speed-reducing drive train adapted for driven engagement with said crankshaft and driving engagement with said drive shaft, said first drive train being constructed and arranged such that said drive shaft may overrun said first drive train, a differential including an outer ring gear rotatable on a first axis, an inner star gear orbital about said first axis and rotatable on a second axis, first and second members rotatable on said first axis, means connecting said star gear with said first member for transmitting rotational movement therebetween, and means connecting said star gear with said second member for translating orbital movement of said star gear into rotational movement of said second member, a second drive train adapted for driven engagement with said crankshaft and in driving engagement with said ring gear, a third drive train adapted for driven engagement with said output shaft and in driving engagement with said first member, and a fourth drive train in driven engagement with said second member and adapted for driving engagement with said drive shaft, said fourth drive train being constructed and arranged such that said drive shaft may overrun said fourth drive train.