Free Wheel Pulley

Pulleys

A Freewheel pulley makes the mechanical link between the alternator and the engine output crankshaft pulley. The pulley drives the alternator which allows the battery to be recharged. The Overrunning Alternator Pulley (OAP), also called the freewheel pulley, is a spare part of the complete alternator. It is composed of a pulley with an outside diameter suitable for fitting a “poly-V” belt (drive belt), a one-way clutch unit with bearing supports, an inner ring, two seals and an end cover in plastic. This alternator component is subject to high stress: it rotates up to 12,000 r/min.

The Freewheel Pulley is used to

Protect belt drive system by filtering engine torsional vibrations to improve the belt drive longevity
Ensure belt drive N.V.H. (Noise-Vibration-Harshness) for optimum driving comfort
Stop friction losses caused by belt slippage
Allow the alternator rotor to turn in freewheel mode when the engine is slowing down or stopping for maximum system efficiency, fuel savings and CO2 emissions reduction

Turn the freewheel pulley with Valeo products

As the O.E. leading world expert in Electrical Systems, Valeo presents a complementary range to its alternator portfolio to provide full packaged services for customers. Choose Valeo freewheel pulley offer and enjoy its benefits:

• Ensurance of the highest quality - certified under various tests
  • Made of the finest possible materials and bearing, the products have been tested according to Valeo high-quality standards to ensure the strong robustness of each part: salt spray test, high-pressure sealing, load - bearing resistance, large temperature difference conditions, cycle speed test, high number of stop - start tests…
• Long belt drive lifespan - securing the belt drive system by blocking engine torsional counter rotations  
• More driving comfort - helping to improve the belt drive noise, vibration and harshness
• Enhanced engine efficiency, fuel savings and CO2 emission reduction due to
  • Allowing the alternator rotor to still turning in freewheel pulley mode when engine is coasting or stopping
  • Stopping friction losses due to belt slippage

Fast growing - a dedicated ASEAN range

Valeo is rapidly increasing its portfolio of freewheel pulley aiming the maximum of the coverage range in the world. Targeting the strong portfolio development in ASEAN region by delivering an irreproachable product quality, Valeo offers to ASEAN market the free wheel pulleys for large variety of Japanese, Korean, Malaysian and European cars.

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