| 摘要 |
An internal combustion engine includes a cylinder head having a plug insertion hole, an ignition plug inserted in the plug insertion hole and having an input terminal covered with a plug cap. An ignition system includes an ignition coil assembly having a primary coil, a secondary coil, and a core extending through the primary and secondary coils, the ignition coil assembly being disposed in the plug cap. The ignition system also includes magnets mounted on respective ends of the core, the magnets being oriented so as to produce magnetic fluxes in a direction opposite to magnetic fluxes generated by the primary coil. The ignition system also has a shield member of a magnetic material surrounding the ignition coil assembly, and an insulating member of an electrically nonconductive material interposed between the shield member and an inner wall surface of the plug insertion hole. The shield member is of a substantially cylindrical shape having an electrically nonconductive insulating region in a circumferential portion thereof.
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