STARTING SYSTEM Function Bring the engine to cranking

STARTING SYSTEM Function: Bring the engine to cranking r. p. m. (200 rpm) so the engine can draw fuel and air and ignite that fuel and air.

Starter Principles Video

Construction (PARTS) • • • Casing Drive housing End cap Armature Brushes Drive Bushings Solenoid Drive fork Return spring

Construction Video

Parts Pole shoe type • Four pole shoes • Four field windings • Fords movable pole shoe – One pole shoe is moveable – Contact disc – Return spring – Plunger

Pole shoe Video

SOLENOIDS • Types: – Positive engagement – Solenoid Actuated

• Function: • Engage starter drive* • Supply current to starter • Disengage the current and drive *not on moveable pole shoe type

Construction • Pull in windings(large) • Hold in windings • Plunger • Return spring • Contact disc

Solenoid Video

Wind types • Series • Shunt (parallel) • Compound (series/parallel)

Starter drives • Function: – Provide for a positive engagement with the ring gear. – Protect the armature from prolonged engagement.

Starter Drive Video

Starter Armature • Function: Is the moving part of a starter motor. The armature uses an EMF to push and pull itself

Commutator Purpose: The commutator is on the armature, it is used to switch the current paths though the armature windings so that the armature always bends the “Lines of Flux” (carrot in front of the donkey)

Commutation