Driv·ing, a.
 1. Having great force of impulse; as, a driving wind or storm.
 2. Communicating force; impelling; as, a driving shaft.
 Driving axle, the axle of a driving wheel, as in a locomotive.
 Driving box Locomotive, the journal box of a driving axle. See Illust. of Locomotive.
 Driving note Mus., a syncopated note; a tone begun on a weak part of a measure and held through the next accented part, thus anticipating the accent and driving it through.
 Driving spring, a spring fixed upon the box of the driving axle of a locomotive engine to support the weight and deaden shocks. [Eng.] --Weale.
 Driving wheel Mach., a wheel that communicates motion; one of the large wheels of a locomotive to which the connecting rods of the engine are attached; -- called also, simply, driver. See Illust. of Locomotive.


 driving wheel
      n : a wheel that drives a motor vehicle (transforms torque into
          a tractive force)