The one-way pulley of the generator pulley is used to alleviate the impact of the generator and the adjustment of the power generation when the vehicle is accelerating and decelerating rapidly. Just before the engine stops running, the engine crankshaft on the one-way pulley of the generator will have a short positive and negative rotation. At this time, the rotor of the generator still rotates in the original direction.

Whether the generator pulley is a one-way pulley has a great influence. Belt vibration will reduce the life of relevant accessories on the belt, air conditioning pump, tension pulley, etc.