How to use the shock absorber of the pulley

The pulley is a whole made of iron, and the pulley in front of the crankshaft of the car, there are many cars in order to reduce the impact vibration caused by the combustion of the engine, on the ordinary all-steel pulley, in the middle of the ring cut In the inner and outer parts, rubber is buried in the gap between the inner and outer parts. In this way, the engine's power will first pass to the inner ring of the pulley, then to the damping rubber in the middle layer, and then from the damping rubber to the outside. ring. In this way, the vibration of the engine is reduced outside the rubber. To put it bluntly, it is a layer of rubber about five millimeters thick. It can effectively increase the life of the belt. Of course, this rubber layer will also be bad. If it is broken, the entire belt will be replaced. However, rubber layer life is much longer than belt life.