Patent ID: 7629869
Filing Date: 2009-12-08
Classification: H01F

Abstract:
1. An ignition coil comprising: a coil body that includes a primary coil, a secondary coil, and a center core made of a magnetic material, the center core being provided on an inner peripheral side of the primary coil and the secondary coil, the coil body having an end on a low-voltage side thereof, the secondary coil having a secondary spool made of a resin to have an annular cross section and a secondary wire wound around the secondary spool, the secondary coil being provided on an inner peripheral side of the primary coil, the center core being provided on an inner peripheral side of the secondary spool, the secondary spool having an end on a low-voltage side thereof; a connector that is coupled with the end of the coil body on the low-voltage side thereof, the connector having an aligning part adapted for centering the center core, the aligning part having a tubular shape for supporting an end of the center core on a low-voltage side thereof, the end of the secondary spool having a tubular shape adapted for engagement with an outer periphery of the aligning part; a coil case that receives the primary coil and the secondary coil; a filling resin that is provided to fill clearance within the coil case and the connector; and a vent groove that is provided to facing surfaces of the aligning part and of the end of the second spool on the low-voltage side thereof, the vent groove being adapted for releasing gas around the center core to an exterior of the secondary spool.