Design (2004): Freewheel

Fig 1: Identifying Freewheel

Courtesy of VOLVO CARS OF NORTH AMERICA.

Certain generators are equipped with a freewheel between the rotor shaft and the pulley. The freewheel on the pulley can be seen on the internal hexagonal section of the center of the pulley. Using the freewheel, the generator rotor shaft can only rotate freely in one direction. This minimizes any jerking in the belt transmission.