How Motorcycle Engine Starts by just pressing the Self Button? | How Bike Self Motor Works?
When ignition switch of the bike is pressed, it allows a small current to flow through the solenoid present in the starter circuit. When current passes through coil of solenoid, it attracts an iron rod. The movement of the rod closes two heavy contacts, completing the circuit from the battery to the starter. The powerful starter motor starts rotating. Its shaft carries a small pinion which engages with a large gear ring around the rim of the engine flywheel.
The ignition switch has a return spring, so that as soon as you release the key it springs back and turns the starter switch off. The rod also has a return spring -when the ignition switch stops feeding current to the solenoid, the contacts open and the motor stops. The return springs are needed because the starter motor must not turn more than it has to in order to start the engine. The reason is partly that the starter uses a lot of electricity, which quickly runs down the battery. Also, if the engine starts and the starter motor stays engaged, the engine will spin the starter so fast that it may be badly damaged.The starter motor itself has a device, called a Bendix gear, which engages its pinion with the gear ring on the flywheel only while the starter is turning the engine. It disengages as soon as the engine picks up speed.
So, ultimately, the starter system produces rotation of flywheel, and hence rotation of crankshaft, and thus the reciprocating motion of piston starts. After suction of charge, the first compression and first power stroke will occur due to starter and thereafter the flywheel will do its job to continue the rotation of the crankshaft.
#StarterMotor #HowBikeStarts
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