Multiple step advance with magnetic trigger rotor

Internal-combustion engines – Igniters – Sparkers

Patent

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Details

123602, 123149D, 310 70R, 310153, F02P 306

Patent

active

043455530

ABSTRACT:
An ignition system for a small internal combustion engine is disclosed, including a magnetic trigger rotor (33) having two magnets (45) disposed in arcuate slots (43), with a radial slot (41) disposed between the arcuate slots (43) for causing an abrupt flux reversal in a pickup coil (35) to generate an initial ignition timing signal, and two or more holes (47), (49) adjacent the radial slot and made in the direction of the axis of rotation of the rotor, for causing flux distortions which becomes significant at higher rotational speeds, to give a step-type ignition advance. Also disclosed are charging coils (21) for charging a capacitor (C1) in a capacitor discharge ignition system, which are part of a separate assembly than generating coils (23) usable for powering lights and other accessories on a vehicle equipped with an engine having an ignition system according to the invention, which are a separate assembly, so that such an ignition system may be provided without generating coils for applications where they are not required. Charging coils (21) and generating coils (23) are in separate semi-circular assemblies, and are initially produced by making a circular assembly, and severing it into sections.

REFERENCES:
patent: 2325927 (1943-08-01), Wilbur
patent: 3619634 (1971-11-01), Burson
patent: 3961618 (1976-06-01), Swift

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