The function of the tensioning idler pulley is to adjust the tightness of the timing belt, and it is generally replaced together with the timing belt to avoid any worries. Therefore, it is also a vulnerable part of automobiles and other spare parts. The belt is easy to be stretched after a long time. Some tensioners can automatically adjust the tension of the belt. In addition, with the tensioner belt, the car runs more smoothly and has less noise Reduced to prevent the car from skidding.

The tensioner needs a certain amount of torque in order to maintain proper belt tension, avoid belt slippage, and compensate for belt wear and elongation caused by aging during actual use. When a belt tensioner is running, the moving belt can induce vibrations in the tensioner, which can cause premature wear of the belt and tensioner. For this reason, a resistance mechanism is added to the tensioner. However, because there are many parameters affecting the torque and resistance of the tensioner, and the influence of each parameter is not the same, the relationship between the components of the tensioner and the torque and resistance is very complicated. The change of torque directly affects the change of resistance and is the main factor affecting resistance. The main factor affecting torque is the parameter of the torsion spring.