When the starter switch is turned on, electric current from the battery is supplied to the traction relay, which is installed on the starter housing. The plunger in the traction relay retracts inward and rotates the center lever, pushing the pinion gear into the hole to engage with the flywheel ring gear. When the solenoid plunger reaches the end, it closes the internal contact and all the electric current is supplied to the coils of the traction relay. The armature turns the crankshaft, thus starting the engine.
A special freewheel is installed on the drive gear, which turns off the starter as soon as the car starts to move independently.
When the starter switch is turned off, the traction relay is de-energized and the spring moves the plunger back to its original position. He turns the lever to disengage the pinion gear from the flywheel crown.
Pic. 12.3 Bosch starter view
1 end cap
2 Retaining ring
3 Gaskets
4 O-ring
5 Sleeve
6 end cap
7 Brush holder
8 Field windings
9 Permanent magnet
10 Corps
11 Anchor
12 Pinion and freewheel
13 Traction relay
14 Drive
15 Drive cover
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