SKF belt tensioner pulleys for timing system and auxiliary drive are based on state-of-the-art technology. The years of experience accumulated by SKF in the design and supply of belt tensioner pulleys of the world's automotive manufacturers, provide a guarantee of the high quality and performance of each belt tensioner unit included in the SKF product range.
The idler pulley is fixed and allows the belt to be correctly wound around the driven component. When the auxiliary belt drives several components, belt tensioner pulleys are used for guiding the belt and keeping correct tension along the whole length of the belt. The pulley profile is often characterized by one or more ribs.
The belt tensioner unit sets the right tension and provides guidance for the belt. The adjustment of tension during mounting is achieved by means of an eccentric or by means of a spring, acting against a rear plate. The automatic belt tensioner unit, with its built-in-spring and friction system, maintains a constant tension of the belt while the engine is running.
Failure and analysis - Belt tensioner pulley
Description of failure
Damage to the flange (guidewall) of pulley. May cause roughness and fraying to one edge of the timing
belt.
Root cause
Impact during fitting/handling (a). Ingress of foreign object into timing system (b).
Preventive of action
Protect pulley from impact, leverage during fitting (a). Ensure that the timing system covers are all present, and correctly fitted with no gaps for objects to enter (b). Ensure that there are no loose fasteners during re-assembly of the timing system (b).
Evidence
Damaged pulley flange (guidewall). Possible fraying to one edge of timing belt.
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Tel +39 080.5367261 - Fax +39 080.5368316
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