If the two-way damping pulley provided by the other party does not have an overrunning clutch, it may basically be made of rubber bonded with the outer ring iron ring, and the inner and outer rings are filled with special rubber. The damping mechanism of the rubber is similar to the damping spring, which can reduce the resonance amplitude during the operation of the pulley and slow down the impact during speed change. Try to achieve shock absorption. As far as we know, the actual damping effect of this belt pulley is not obvious, because it does not have the function of surpassing the clutch, the impact of slowing down the speed change is limited, and for the generator with high moment of inertia, it can not continue to rotate inertia and stop slowly, and can not actually and effectively protect the generator.