Two stage starter drive system

F - Mech Eng,Light,Heat,Weapons – 02 – N

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F02N 11/00 (2006.01) F02N 15/04 (2006.01) F02N 15/06 (2006.01)

Patent

CA 1141613

ABSTRACT OF THE DISCLOSURE A two stage positive shift starter drive system for an internal combustion engine is disclosed. A pair of elec- trical switches are sequentially actuated by an actuator solenoid engaging the starter drive's pinion gear with the engine's ring gear. The first switch actuated after a pre- determined displacement of the solenoid's armature applies electrical power to the cranking motor's through a resistance connected in series with the cranking motor and connected in parallel with the solenoid's pull in coil. The resistance reduces the electrical power applied to the cranking motor and the potential across the solenoids pull-in coil thereby reducing the rotational speed and the engagement force applied to the pinion gear. The end of the armature travel closes the second switch applying full power to the cranking motor permitting normal cranking of the engine with the pinion gear fully engaged with the ring gear.

340143

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