Patent ID: 8562476

Claim:
A transmission with a reduced package size and reduced mass for an engine, the transmission comprising: an input sprocket; an output sprocket with a hollow center portion drivingly connecting to the input sprocket through a chain; a planetary gear set comprising: a sun gear received by the hollow center portion of the output sprocket, at least two planet gears meshed with the sun gear and mounted to a planet carrier, with the planet carrier fixed relative to the engine; and a differential with a ring gear portion driven by the planetary gear set; wherein when the input sprocket is rotated in a first direction, the chain drives the output sprocket in the first direction and drives the sun gear in the first direction, the sun gear drives the at least two planet gears to rotate in a second direction, opposite the first direction, and the at least two planet gears drive the ring gear portion of the differential, such that the differential is driven in the second direction directly by the ring gear portion.