Ignition coil with open core and central air gap

摘要

An ignition coil intended for being mounted directly on a spark plug comprises a laminated magnetic core (30) of elongated shape along a longitudinal axis (31) of said coil, together with a low-voltage primary winding (20p) coaxial with the magnetic core (30) and arranged in such a manner as to generate magnetic flux lines substantially parallel to said longitudinal axis (31), and a high-voltage secondary winding (20s) likewise coaxial with the magnetic core (30) and arranged in such a manner as to interlink with said magnetic flux lines (44). The said core (30) comprises at least two sections (40a, 40b) in line with each other along its longitudinal axis (31) and axially separated, by a separation space (42) of nonmagnetic material.