Patent ID: 6237736
Filing Date: 2001-05-29
Classification: F16D,F16H

Abstract:
A one-way clutch built-in type driven pulley apparatus for an alternator comprising:a rotary shaft for driving an alternator to rotate with a rotor of this alternator;a driven pulley disposed around the rotary shaft concentrically with the rotary shaft;a one-way clutch disposed between a middle part in the axial direction of the outer peripheral surface of the rotary shaft and a middle part in the axial direction of the inner peripheral surface of the driven pulley to transmit a rotating force between the driven pulley and the rotary shaft only when this driven pulley is caused to relatively rotate in a given direction with respect to said rotary shaft; anda pair of support bearings disposed between the outer peripheral surface of said rotary shaft and the inner peripheral surface of the driven pulley to sandwich the one-way clutch therebetween from the both sides in the axial direction to allow a relative rotation between the rotary shaft and the driven pulley while pivotally supporting a radial load applied on the driven pulley,said driven pulley apparatus being used in a state in which an endless belt is passed over from the outer peripheral surface of the driven pulley to a driving pulley fixed to an end portion of a crank shaft of an engine,wherein the range of fluctuation in angular velocity of rotation per rotation of said rotary shaft is less than one-half the range of fluctuation in angular velocity of rotation per rotation of said driven pulley in order to reduce a driving torque of the alternator when said engine is in an idling state and an electric current load of said alternator is at its maximum.