Febi Alternator Overrun Pulley (104828)

Combustion engines do not have a uniform rotary motion. Due to the four-stroke principle, the crankshaft is constantly accelerated and braked. These vibrations are also transmitted to the power unit drive and generate high torque fluctuations, especially on the relatively heavy generator rotor.
In modern vehicles, the generator is equipped with an alternator overrun pulley. It is mounted directly on the drive shaft of the generator and transmits the driving force only in one direction of rotation. This decouples the generator from the vibrations of the crankshaft. The advantage: the belt drive runs smoother and quieter and the service life of the drive belt is extended. For this reason, febi only offers alternator overrun pulleys in OE matching quality.

If the alternator overrun pulley is stuck, engine vibrations are no longer compensated and lead to unsteady belt running at low engine speeds. Due to the increased movements of the belt, high forces act on the tensioning element which can cause both this and the fixed alternator overrun pulley to fail prematurely. In the worst case scenario, this can result in serious engine damage.
Alternator overrun pulleys from febi are therefore intensively tested. Febi's quality management tests the offered components for various requirements and loads, e.g. accuracy of fit, dimensional accuracy, material quality, and tensile strength.