Swinging arm motor unit with two stage chain drive

The drive train linkage (1) has a motor shaft (4) is provided with an electric motor (3), where the motor shaft is connected with two motor drive wheels (5) in a torque proof manner. The motor shaft has two end regions extending from the electric motor. The former motor drive wheel is arranged at the former end region, and the latter motor drive wheel is arranged at the latter motor drive wheel. A gear shaft (6) is provided with a gearwheel (7), where the latter motor drive wheel and the gearwheel are connected by a flexible driving unit.