Belt pulley arrangement for transferring torque between crankshaft and belt drive for starting internal combustion engine of motor vehicle, comprises snap-action spring unit for switching clutch between open position and closed position

摘要

The belt pulley arrangement (20) comprises a snap-action spring unit (6) for switching the clutch (30) between an open position and a closed position. The snap-action spring unit comprises a lever spring, and is axially mounted to the crankshaft (12). The snap-action spring unit is axially supported at the crankshaft with a radially inner edge area, such that the snap-action spring unit snaps over between two metastable states to represent the opening position and the closing position of the clutch.