Patent ID: 7646277
Filing Date: 2010-01-12
Classification: F02P,H01F

Abstract:
1. An ignition coil inserted in a plug hole of an engine, the ignition coil comprising: a coil part including a primary coil, a secondary coil, a soft magnetic center core, and a soft magnetic peripheral core, wherein: a connector case part made of resin and having a connector area, to which an electric wiring is connected, wherein: an annular seal rubber attached to an outer circumference of the connector case part, wherein: a ventilation passage including the ventilation clearance and a ventilation hole that is formed at a certain position of the connector case part away from the seal rubber to communicate with the ventilation clearance and to communicate with an outside of the connector case part, wherein the plug hole is ventilated to the outside of the connector case part through the ventilation passage.