Ignition coils are known for use in connection with an internal combustion engine such as an automobile engine. Ignition coils typically include a primary winding, a secondary winding, and a magnetic circuit. The magnetic circuit conventionally may include a central core extending along an axis and located radially inward of the primary and secondary windings and magnetically coupled thereto. The components are contained within a case formed of an electrical insulating material with an outer core or shield located outside of the case. One end of the secondary winding is conventionally configured to produce a relatively high voltage when a primary current through the primary winding is interrupted. In a common configuration, insulating resin or the like is introduced into the gap between the secondary winding and the case for insulating purposes. A high voltage cup in electrical communication with the high voltage end of the secondary winding may be press fit within the casing to facilitate coupling with a spark plug that is arranged to generate a discharge spark responsive to the high voltage. However, the area of press fit between high voltage cup and the case may be prone to a void in which an electrical field may concentrate.
What is needed is an ignition coil which minimizes or eliminates one or more of the shortcomings as set forth above.
USPTO Backgrounds
USPTO Backgrounds