Schaeffler North America

FEAD – Front End Accessory Drive

Tension and idler pulleys


One use of INA idler pulleys is to reduce noise in critical belt spans, to prevent collision problems with the surrounding structure, to guide the belt or to increase the angle of belt wrap on neighboring pulleys. These pulleys have the same rating life and noise development requirements as belt tensioning systems. For this application, high-precision single-row ball bearings with an enlarged grease supply volume have proven sufficient. If required, double-row angular contact ball bearings are used that also have an optimized grease supply volume. These bearings are equipped with high-temperature rolling bearing greases and appropriate seals. Standard catalog bearings are not as suitable for this application.

The tension pulleys installed consist of single or double-row ball bearings specially developed, optimized and manufactured by INA for use in belt drive applications. Depending on the application, pulleys made from glass fiber reinforced polyamide or corrosion protected steel can be added.

Thanks to Schaeffler’s highly developed tooling and manufacturing technology, the pulleys made from highly temperature resistant, glass fiber reinforced polyamide are just as good as the steel pulleys when it comes to roundness and running characteristics and may offer significant cost and weight benefits. Adjusted dust covers made from steel or plastic may also be used.