Ignition coil device for engine

摘要

An engine igniting coil device wherein an I-type core fitted in a hollow portion of a primary coil bobbin and a U-type core are arranged to oppose at their end faces, each other at a specified gap therebetween to form a closed magnetic circuit. The primary coil bobbin with the I-type core has a core holding portion integrally formed thereon for attaching thereto an end portion of the U-type core and the core holding portion also serves as an anti-cracking cover. This cover can accurately determine the positions of both cores and can effectively prevent initiation of cracking in the potting resin injected and cured in the coil case.