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The Schaeffler Group's INA brand stands for the development and manufacture of rolling bearings, plain bearings and linear systems as well as precision components for the automotive industry for engines, transmissions and powertrains worldwide.

For 60 years, INA brand products have stood for creative application solutions as well as top engineering and production expertise to the company's customers.


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    • Reference document downloads

    • The overrunning alternator pulley is one of the "unsung heroes".

      This inconspicuous component reduces vibrations and improves the energy efficiency of modern engines. The function of the overrunning alternator pulley is to decouple the generator from the rotational irregularity of the crankshaft. The alternator pulley powers the alternator by means of a "soft" torsion spring. It absorbs the rotational imbalance which then prevents torque fluctuations. The dynamic forces within the assembly drive are reduced, and the tensioners, pulleys and belts are subjected to smaller loads, are protected against damaged and therefore have longer service life.

      Advantages of the OAP at a glance

      Significant reduction in the loads placed on the belt

      Improved Ride/ Increased Smoothness

      Contribution to reducing fuel consumption

      Improved noise level / Quieter Ride Longer rating life of components

      Increase in generator speed in the idling range

      As these belt pulleys are exposed to wear in the same manner as tensioner pulleys and belts, Schaeffler Automotive Aftermarket recommend replacing the OAP when replacing the components in the assembly Drive.