STARTINGSYTEM

 

STARTING SYTEM

Construction and working of a Self Starter:

 The electrical energy is converted into mechanical energy in starting motor or self starter. When a current carrying conductor is placed in a magnetic field, a mechanical force is experienced by a conductor, the direction of the force given by fleming’s right hand rule.

In a starting motor the brushes are made o flow resistance material such as copper. The main parts of starting motor are Casing, Armature, Commtator, field winding brushes, poles and terminals. A drive mechanism is provided at the end of the armature shaft by means of which the motor starts the engine.

 

Drive arrangement:

 The Starting motor is linked to the engine fly wheel through a set of

gears. A pinion gear is attached to the starter armature which drives a

ring gear attached to the fly wheel.

 

Type of Drive Arrangements:

 

•  Inertia Drive
• Bendix drive
• Folo-thru drive
•  

2 Over running clutch drive

 

Bendix drive:

It is fastened in the armature shaft of the starting motor. An internal threaded pinion gear is mounted on the threaded sleeve. When the starting motor is at rest the switched on, the armature begins to rotate.

The pinion, because of its inertia of rest and its unbalanced weight turns very little but moves forward and engages with the teeth of fly wheel. When the fly wheel turns the crank shaft also turns and the engine starts. After the engine has started, the pinion gear is turned by the engine much faster. This causes the pinion gear to turn back on the threaded sleeve making it disengaged with fly wheel.

Over running Clutch drive:

 In this drive the starter lever is linked to a starter pedal. The shift lever compress the drive shaft and spring which ultimately pushes the over running clutch and pinion gear assembly towards the fly wheel. When the engine starts, the over running clutch comes into action. As the starting motor runs, the pinion is driver through the over running clutch. But as soon as the engine starts the pinion turns much faster than starting motor,due to which it slips backward into the over running clutch.