Abstract: Procedure and device for converting the torque acting on the shaft when energy quanti are transferred from the input shaft, driven by the engine, to the output shaft, driving the load, in the form of impulses the number of which in time unit is proportional to the difference between the revolution speeds of the input shaft and the output shaft. The input shaft, driven by the engine, disengages itself repeatedly from the middle shaft, when the motional speed of the moving parts of the engine and the quantity of the motional energy based on it grows, which growth of the motional energy will be converted as impulses into potential energy, which in form of the torsional force of the spring, located between the middle shaft and the output shaft, maintains on the output shaft a torque required by the loading.