Abstract: This invention concerns a process and a motor unit for driving a load such as an automotive or similar vehicle, which can move at least intermittently by momentum, once it has been set in motion by the motor unit. The motor unit comprises at least two electric motors each driving a propulsion component such as a wheel, an accumulator supplied by a generator which is driven by a combustion engine or similar motor, and means of connecting the accumulator permanently to one of the electric motors and of connecting this accumulator to the other electric motor in order to set the vehicle in motion, this other motor being disconnected from the accumulator once the vehicle is set in motion, and thereafter supplying an electric current which is used to charge the accumulator. The invention can be applied to the driving of any vehicles such as motorcycles, motor-cars and similar vehicles, as well as boats, aircrafts, etc.