driving axle(n = noun.artifact) live axle - the axle of a self-propelled vehicle that provides the driving power;
is a kind of axle
is a part of drive line, drive line system

axle, axle bar, axle box, axle grease, axle guard, dead axle, driving, driving belt, driving force, driving iron, driving licence, driving license, driving range, driving school, driving wheel, live axle, wheel and axle