Overrunning alternator pulley consists of a cross-sectional shape with ribbed belt pulley with outer matches, with a double bearing, punching one-way clutch inner and outer ring composed of two devices as well. To prevent the effects of water and other contaminants, the outer end face of the installation of a protective cover. Overrunning alternator pulley discharged from the engine to the alternator rotation speed of the crankshaft unevenness, since the alternator has a maximum moment of inertia in the belt drive system accessories. In this manner, the alternator rotation unevenness using only the acceleration component to drive the crankshaft.
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