Motor-drive assembly for a vehicle component

A gearbox (3) has a pinion end and a power-take-off side coupled to the pinion end and to an adjustable component on the pinion end. A kinematic chain in the gearbox between the pinion end and the power-take-off side has first (7) and second (6) transmission links. A drive mechanism (1) has a single-piece operation with an adjustable blocking element (8).