Ignition coil for internal combustion engine
AssigneeDenso Corporation
InventorsTakashi Nagata, Kazutoyo Osuka, Atsuyuki Konishi, Junichi Wada
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Abstract
An ignition coil according to the invention is an ignition coil having a case and a coil portion accommodated in the case. The case comprises a base resin whose dielectric breakdown voltage exceeds that of polyphenylene sulfide and whose spiral flow length exceeds that of polybutyrene terphthalate. As the base resin has a high fluidity, there is only a limited risk that a defect such as a weld line is caused when molding a thin case. In addition, while the thickness of the case and the electrical insulation properties are in proportion to each other, the case comprising the base resin can ensure sufficient electrical insulation properties even if the case is formed thin.
Claims7
An ignition coil having a case and a coil portion accommodated in said case, wherein said case comprises a base resin whose dielectric breakdown voltage exceeds that of polyphenylene sulfide and whose spiral flow length exceeds that of polybutyrene terephthalate.
An ignition coil having a case and a coil portion accommodated in said case, wherein said case comprises a base resin whose dielectric breakdown voltage exceeds that of polyphenylene sulfide and whose spiral flow length exceeds that of polybutyrene terephthalate and said base resin has a load-deflection temperature of 240 degrees C. or higher.
An ignition coil having a case, and a coil portion accommodated in said case, wherein said case comprises a base resin whose dielectric breakdown voltage exceeds 15 kV/mm and whose spiral flow length exceeds 150 mm.
Dependencies are inferred from the claim text.