Pulley member for transmitting power alternator separate starter motor equipped with such a pulley and drive system heat engine.

摘要

Alternator-separate starter motor crankshaft of a combustion engine of a motor vehicle, which has during startup a first zone of deformation base and grubbing a second zone of deformation more extensive than the first zone of deformation base and having a pulley body power transmission (10, 20) belt (1), during startup and then system operation, comprising at least one resilient decoupling element (202, 302, 402, 502, 602) located between a central hub (203, 303, 403, 503) and a wheel (201, 301, 401, 501) on which the drive belt tends, and is associated with a limiting element progressive displacement (510; 610; 710) characterized in that the deflection limiter comprises two components, namely a supportive central dish (512, 612, 712, 812, 912) of an outer face of the central hub, coupled to two stops (514, 614 , 714, 814, 914) arranged regularly, in periphery, on an inner face of the wheel, and in which the uncoupling elements and limiting the displacement form a resilient assembly providing two stiffness values, whether motor or receiver phase namely a first base value (K1, K2) of the rigidity provided by the resilient decoupler element active during startup or operation in a central area of ​​positive and negative deformations for each torque direction which corresponds to said first deformation zone base and the which is added in the intervals situated beyond said central area, an additional stiffness (ΔK1, ΔK2) provided by the deflection limiter to provide a resulting stiffness (K3, K4) of higher absolute value.