DISPOSITIF D'ALLUMAGE POUR UN MOTEUR A COMBUSTION INTERNE ALTERNATIF

摘要

1291873 Timing ignition BRIGGS & STRATTON CORP 18 Nov 1969 [28 April 1969] 56425/69 Heading F1B [Also in Division H1N] A switching arrangement intended to provide spark advance for a small internal combustion engine has a movable magnet 31 mounted on the engine flywheel so as to influence a magnetic contact unit 17 and a fixed cone 12 having a coil 28 associated therewith in series with a coil 27 adjacent the contact unit 17. Polepieces 30, 34 of the magnet form parts of the flywheel and are shaped to provide successive SNS poles around its periphery so that at high rotational speeds of the flywheel the flux reversal in the core 12 induces a current in the coil 28 sufficient to energize the coil 27 to an extent that the opening operation of the contact unit 17 is advanced. In the magnets arrangement of Fig. 1 the primary and secondary windings are mounted on the core 12 but in a battery and induction coil arrangement Fig. 4 (not shown) the coil 28 is the only coil on the core 12.