| 摘要 |
The invention provides an ignition device of a cylindrical shape for an internal combustion engine, in which device it is possible to improves a productivity of a side core and a center core and to improve the efficiency of converting a magnetic flux together with the decreasing of the number of the steps of assembling process. The ignition device comprises a primary coil, a secondary coil, a center core, a side core, all of which are located concentrically in this order from the inside thereof, and a silicon steel strip having a thickness not more than 0.2 mm is used an a material of the side core so that a spirally wound, cylindrical shape is provided. Further, a thin film amorphous silicon steel strip having a flux density B8>=1.4T at a direct current magnetizing force of 800 A/m or a crystallized silicon steel strip having a thickness not more than 0.23 mm and having the same magnetic characteristics as above is used as a material of the center core, and the shape of the center core is formed in a spiral shape. Thus, it becomes possible to improve the productivity and to achieve the increase of flux density. Further, since it is possible to reduce the number of the parts in the side core, it is possible to reduce the number of the steps of an assembling process.
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