Patent ID: 8026783
Filing Date: 2011-09-27
Classification: H01F

Abstract:
1. Spark plug coil assembly comprising: a primary core bearing primary windings; a secondary winding spool around which secondary windings are wound, the primary core being received in the spool through an open end of the spool, the spool being formed with a closed end opposite the open end, wherein no pole piece is disposed between the primary core and the closed end of the spool; a terminal embedded in the closed end of the spool and electrically connected to the secondary windings, the terminal being electrically couplable to a spark plug by coupling components, wherein ignition voltage generated in the secondary windings is routed to a center of the secondary windings to terminate at the terminal; a case holding the spool, wherein the case is frusto-conical in shape; and a magnetic shield at least partially surrounding the case, wherein the magnetic shield is frusto-conical in shape for increasing magnetic coupling between the magnetic shield and the primary core, wherein the magnetic shield surrounds the secondary windings.