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To provide an ignition coil for an internal combustion engine which improves high-voltage sealing performance and moreover reduces housing outer diameter, an ignition coil for an internal combustion engine is made up of a transformer portion of cylindrical configuration housed within a housing chamb

To provide an ignition coil for an internal combustion engine which improves high-voltage sealing performance and moreover reduces housing outer diameter, an ignition coil for an internal combustion engine is made up of a transformer portion of cylindrical configuration housed within a housing chamber of a case, a control-circuit portion which is positioned on one end portion of this transformer portion and causes primary current of the transformer portion to be intermittent, and a connecting portion which is positioned on another end portion of the transformer portion and supplies secondary voltage of the transformer portion to a spark plug. The interior of the housing chamber is filled with insulating oil which has a flash point of 180.degree. C. or more, a total acid number of oxidation stability of 0.6 mgKOH/g or less, a pour point of -20.degree. C. or less with no cloudiness occurring before that temperature is reached, and a kinematic viscosity of not less than 20 cSt and not more than 180 cSt at 40.degree. C.

대표청구항 ▼

[ What is claimed is:] [1.] An ignition coil for an internal combustion engine, said coil comprising:a case;a coil portion disposed within said case; andinsulating oil at least partially filling said case to immerse said coil portion;wherein said insulating oil has a flash point of at least 180.degr

[ What is claimed is:] [1.] An ignition coil for an internal combustion engine, said coil comprising:a case;a coil portion disposed within said case; andinsulating oil at least partially filling said case to immerse said coil portion;wherein said insulating oil has a flash point of at least 180.degree. C.; a total acid number of oxidation stability of not more than 0.6 mgKOH/g; a pour point of not more than -20.degree. C., said insulating oil being free of cloudiness before said temperature is reached; a dielectric strength of at least 70 kV; and a kinematic viscosity of not less than 20 cSt and not more than 180 cSt at 40.degree. C.