IGNITION COIL FOR INTERNAL COMBUSTION ENGINE

摘要

An ignition coil for an, internal combustion engine includes an annular elastic seal which is tightly attached to a high-voltage tower and a plug installed in the high-voltage tower to be conductible with a spark plug. The elastic seal hermetically seals a gap between the high-voltage tower and the plug and also functions as a buffer to absorb stress, as exerted from the plug on a case of the ignition coil. This enables the case to be reduced in size as a whole without having to partially increase the wall thickness of the case to ensure a required degree of stiffness of the case and also results in improved degree of hermetic sealing between the plug and the high-voltage tower.

主权项

1. An ignition coil for an internal combustion engine comprising:
a primary coil and a secondary coil which are magnetically coupled together; a case which includes a case body in which the primary coil and the secondary coil are disposed and a high-voltage tower which is of a cylindrical shape and extends from the case body; a resinous filler which is packed in the case body to hermetically seal the primary coil and the secondary coil; a plug which is disposed in the high-voltage tower to be electrically conductible in an axial direction of the ignition coil; and an elastic seal which is of an annular shape and attached to the plug and the high-voltage tower to hermetically seal a gap between the plug and the high-voltage tower.