What is one primary role of a tensioner in a mechanical belt system?

In a mechanical belt system, the primary role of a tensioner is to maintain proper tension in the belt. Correct tension is crucial for the efficient operation of the system because it ensures that the belt remains securely in place on the pulleys, preventing slippage and allowing for the optimal transfer of power or motion. If the belt is too loose, it can lead to slippage, which may result in inefficient operation and increased wear on the belt and associated components. On the other hand, if the belt is too tight, it can cause added strain on bearings and other components, potentially leading to premature failure. The tensioner automatically adjusts to variations in the belt length due to wear or thermal expansion, ensuring consistent performance of the mechanical system.