Stick-type igntion coil device having thermal stress releasing member

摘要

A stick-type ignition coil device has a central core, and primary and secondary windings wound concentrically around the central core in a coil casing. A positioning part is provided in the casing to define the position of the central core. An insulating resin such as epoxy resin is filled in the coil casing for electrical insulation and fixing of components in the coil casing. A thermal stress releasing member, which is less adhesive to and easily peelable from the insulating resin, is provided on the upper surface of the positioning part. The thermal stress releasing member is separated from the insulating resin and allows the positioning member to move with the central core, thereby minimizing cracks which will occur in the insulating resin formed between the central core and the positioning part.