US 6,982,622 B2
Ignition coil device
Shouichi Takeyama, Hashima (Japan); Kazuhide Kawai, Kariya (Japan); and Masahiko Aoyama, Kariya (Japan)
Assigned to Denso Corporation, (Japan)
Filed on Dec. 01, 2003, as Appl. No. 10/724,172.
Claims priority of application No. 2002-354113 (JP), filed on Dec. 05, 2002; and application No. 2003-373496 (JP), filed on Oct. 31, 2003.
Prior Publication US 2004/0113735 A1, Jun. 17, 2004
Int. Cl. H01F 27/02 (2006.01)
U.S. Cl. 336—96 19 Claims
OG exemplary drawing
 
1. An ignition coil device mounted in a plug hole of a plug hole member, an internal space being defined between the ignition coil device and a wall of the plug hole, the ignition coil device comprising:
a primary spool;
a primary coil wire that is wound around an outer surface of the primary spool; and
a peripheral core that surrounds the primary coil wire with an interval gap defined between an inner surface of the peripheral core and an outer surface of the turns of the primary coil wire,
wherein an outer surface of the peripheral core is exposed towards the internal space,
wherein a gas path is provided through the peripheral core for gas to flow between the outer surface of the peripheral core and the inner surface of the peripheral core, and
wherein at least a given portion of the outer surface of the primary spool is formed of crystalline resin, and wherein gas is able to reach the given portion from the internal space via the gas path, the interval gap, and spaces between turns of the primary coil wire.