Auxiliary drive unit for internal combustion engine; has chain gear that switches between at least two transmission ratios with two differently-sized driven gears that can be slid into or out of plane

摘要

The unit has a chain gear that switches between at least two transmission ratios in the same plane. The chain runs in the same plane over a drive gear (2). At least two differently sized driven gears (3a,b) are provided, which can be moved along a rotation axis perpendicular to the chain plane into and out of the chain plane.