What is the function of an idler pulley?

The function of an idler pulley is fundamentally about managing the tension of a belt within a power transmission system. By providing a guiding point for the belt, the idler pulley helps maintain the appropriate level of tightness, ensuring that the belt remains engaged with the driving and driven pulleys. Adjusting the tension is critical, as it allows for optimal power transfer and prevents the belt from slipping or wearing prematurely.

While other components may serve different purposes—such as driving machinery or reducing friction—these functions are not the primary responsibility of the idler pulley. It is specifically engineered to enhance the performance of the belt system by ensuring that the belt maintains the correct alignment and tension necessary for efficient operation.