| 摘要 |
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 5 of cylindrical configuration housed within a housing chamber 102 of a case 100, a control-circuit portion 7 which is positioned on one end portion of this transformer portion 5 and causes primary current of the transformer portion 5 to be intermittent, and a connecting portion 6 which is positioned on another end portion of the transformer portion 5 and supplies secondary voltage of the transformer portion 5 to a spark plug. The interior of the housing chamber 102 is filled with insulating oil 29 which has a flash point of 180 DEG C or more, a total acid number of oxidation stability of 0.6 mgKOH/g or less, a pour point of -20 DEG 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 DEG C. <IMAGE> |
