Description of the starter

The starter is a mixed-excitation DC motor with an electromagnetic traction relay. The starter consists of a housing or a stator with excitation windings, an armature with an overrunning clutch, a cover with brush holders and a traction relay.

When the starter is turned on, current from the battery begins to flow through the winding of the starter traction relay. The relay armature pulls in and the relay contacts close. At the same time, the relay armature moves the overrunning clutch with the gear through the lever. The overrunning clutch hub turns on the screw splines of the starter armature shaft and also turns the gear, which facilitates its engagement with the flywheel ring gear. A current flows through the closed contacts of the traction relay, which feeds the stator and armature windings, and the starter armature begins to rotate together with the hub and freewheel.

After starting the engine, the speed of the gear exceeds the speed of the starter armature. In this case, the freewheel rotates freely and torque is not transmitted from the engine flywheel to the starter armature shaft. After releasing the ignition key, the power circuit of the windings of the traction relay opens through the ignition switch, the armature of the traction relay is pressed back to its original position by a spring, the relay contacts open and the drive gear disengages from the flywheel ring gear.