Two stage starter drive system

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

Patent

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Details

123/222, 342/29.

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

Patent

CA 1186190

ABSTRACT OF THE DISCLOSURE The present invention provides a dual mode electri- cal starter drive system for cranking an internal combustion engine having a cranking gear, a source of electrical power and a starter switch connected thereto, the starter drive system comprising: a cranking motor having an output shaft rotatable in response to receiving electrical power at an input terminal; a pinion gear attached to said output shaft and rotatable therewith, said pinion gear being axially trans- latable along said output shaft, solenoid actuator means having a resiliently biased armature movable therein from a first to a second position, a pull-in coil and a hold-in coil for receiving electrical power from said source of elec- trical power through said starter switch, said armature being movable from said first position against the force of said resilient bias to said second position in response to said pull-in and hold-in coils receiving electrical power and operative to remain in said second position as long as said hold-in coil receives electrical power, said pull-in and hold-in coils each having an input lead for connection to the starter switch and an output lead, the output lead of said hold-in coil being connected to a common electrical ground and the output lead of said pull-in coil being connect- ed to the input terminal of said cranking motor; shifting means, mechanically linking said armature with said pinion gear, for axially displacing said pinion gear into engagement with the engine's cranking gear as said armature moves to said second position and for axially displacing said pinion gear to disengage from the engine's cranking gear as said armature moves to said second position and for axially dis- placing said pinion gear to disengage from the engine's crank- ing gear when said armature is in said first position; and switch means, attached to said solenoid actuator means and receiving electrical power directly from said source of elec- trical power, for controlling the electrical power received by the cranking motor and the pull-in coil from said starter switch as a function of the position of the solenoid actuator means armature, the arrangement being such that in use said switch means applies full electrical power to the hold-in coil and to the serially connected pull-in coil and cranking motor with the armature in said first position and during movement towards a predetermined intermediate position be- tween said first and second position, said switch means simul- taneously reducing the electrical power applied across said pull-in coil and increasing the electrical power applied across said cranking motor to an intermediate value greater than the value with said switch means in said first position but less than full electrical power after said armature has moved to said predetermined intermediate position, and apply- ing a full electrical power across the cranking motor with no electrical power across the pull-in coil when said arma- ture is in said second position.

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