At the same time, the relay armature moves the overrunning clutch with the gear through the lever. The overrunning clutch hub, turning on the screw splines of the starter armature shaft, also turns the gear, which facilitates its engagement with the flywheel crown.
Through the closed contacts of the traction relay, current flows, feeding the stator and armature windings, and the starter armature begins to rotate together with the hub and the outer ring of the overrunning clutch. Since the clutch rollers are shifted by the springs into the shallower part of the groove of the outer ring 2 (pic. 105), and the gear is braked by the flywheel crown, then the rollers are wedged between the outer 2 and inner 1 ring of the overrunning clutch and the torque from the armature shaft is transmitted through the clutch and gear to the flywheel crown. As a result of gear braking, the coupling hub is screwed off the splines of the armature shaft and the gear is sent all the way into ring 1 (see fig. 103), fully engaging with the flywheel crown.
After starting the engine, the speed of the gear exceeds the speed of the starter armature. Sprag Inner Ring (combined with gear) drags the rollers into the deeper part of the outer ring groove (pic. 105b), compressing the springs of the plungers 3. In this part of the groove, the rollers rotate freely without jamming, and the torque is not transmitted from the engine flywheel to the armature shaft.
After the key is returned to position I («Ignition») auxiliary relay winding power circuit 6 (see fig. 104) interrupted and the relay contacts open. As a result, the power circuit of the windings of the traction relay is disconnected through the contacts of the auxiliary relay. Now the current through the windings of the traction relay goes from the lower contact bolt of the relay, first through the retracting II, and then through the holding I winding and to «mass». Since the direction of the current in the turns of the windings is opposite, the magnetic fluxes created by the windings are mutually compensated and the relay core is demagnetized. The armature of the relay is pressed into its original position by a spring. The relay contacts open, and the drive gear disengages from the flywheel crown.