Belt tensioner pulley Tensioner bearing pulley for Volvo V-ribbed belt set OE 31339795 Polea tensora

Product Description:

Tensioner pulley
OE NO.:  31339795 31251743

Applicable vehicle type: For Volvo

The automotive tensioner pulley is a critical component within the engine's drive train system, designed to automatically regulate the tension of the timing belt or auxiliary belts. This ensures the belts operate stably under appropriate tension. It effectively compensates for elongation caused by wear and ageing, preventing slippage and tooth skipping, thereby safeguarding the proper functioning of auxiliary components such as the alternator, air conditioning compressor, and water pump.

As a wear part, the tensioner pulley is typically recommended for replacement alongside the belt to ensure long-term reliable operation of the drive system.

The tensioner pulley continuously applies appropriate pressure to the belt via an elastic clamping mechanism:

• Dynamic adjustment: The tensioner presses against the belt and follows its movement, altering the pulley wrap angle to automatically adjust tension and compensate for belt elongation.
• Resistance damping: An internal resistance mechanism (such as a torsion spring) absorbs vibrations generated during belt operation, preventing premature wear. Torsion spring parameters directly influence torque and resistance; optimising the mean diameter through proper design enhances resistance values.
• Pressure Retention: Utilises springs or hydraulic pressure to generate sustained tension, ensuring the belt presses against the drive pulley at optimal pressure to guarantee transmission torque and friction.

Core Function: Maintains optimum belt tension – insufficient tension causes slippage and tooth skipping; excessive tension accelerates belt and bearing wear.

• 20 years of specialized auto parts industry experience
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