Ignition coil having a winding form
AssigneeMarshall Electric Corp.
InventorsThomas C. Marrs, Donald Recupido
Life of this patent
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Abstract
An ignition coil has a ferromagnetic core, a primary coil surrounding a portion of the core and wrapped helically with a conductor, a winding form having partitions extending outwardly of a tubular surface of the winding form, and a secondary coil wrapped on the winding form. The partitions define a plurality of annular coil chambers including central chambers and end chambers. The end chambers have a spiral land. The secondary coil includes coil sections in each of the plurality of coil chambers. The secondary coil has coil turns in the end chambers in a spiral configuration on the spiral land and increasing progressively in diameter toward the central chambers.
Claims14
An ignition system comprising:
- a ferromagnetic core;
- a primary coil surrounding a portion of said ferromagnetic core, said primary coil being wrapped helically with a conductor;
- a winding form having partitions extending outwardly of a tubular surface of said winding form, said partitions defining a plurality of annular coil chambers including central chambers and end chambers, said end chambers having a spiral land;
- and
- a secondary coil wrapped on said winding form including coil sections in each of said plurality of coil chambers, said second coil having coil turns in said end chambers in a spiral configuration on said spiral land and increasing progressively in diameter toward said central chamber, said end chambers comprising:
- a first end chamber formed adjacent to one of said central chambers;
- a second end chamber formed on a side of said first end chamber opposite to said one of said central chambers;
- a third end chamber formed on a side of said second end chamber opposite said first end chamber;
- and
- a fourth end chamber formed on a side of said third end chamber opposite said second end chamber, said fourth end chamber located adjacent an end of said winding form, said fourth end chamber having a greater volume and width than a volume and width of said third end chamber, a bottom of said third end chamber having a radius equal to a radius of a bottom of said fourth end chamber, a bottom of said first end chamber having a radius greater than a radius of a bottom of said second end chamber, a bottom of said second end chamber having a radius greater than a radius of a bottom of said third end chamber.
An ignition system comprising:
- a spark plug;
- a power supply;
- and
- an ignition coil connected to said spark plug and to said power supply, said ignition coil comprising:
- a ferromagnetic core;
- a primary coil surrounding a portion of the core, said primary coil being wrapped helically with a conductor;
- a winding form having partitions extending outwardly of a tubular surface of said winding form, said partitions defining a plurality of annular coil chambers including central chambers and end chambers, said end chambers having a spiral land;
- and
- a secondary coil wrapped on said winding form and including coil sections in each of said plurality of coil chambers, said secondary coil having coil turns in said end chambers in a spiral configuration on said spiral land and increasing progressively in diameter toward said central chamber, said end chambers comprising:
- a first end chamber formed adjacent to one of said central chambers;
- a second end chamber formed on a side of said first end chamber opposite to said one of said central chambers;
- a third end chamber formed on a side of said second end chamber opposite said first end chamber;
- and
- a fourth end chamber formed on a side of said third end chamber opposite said second end chamber, said fourth end chamber located adjacent an end of said winding form, said fourth end chamber having a greater volume and width than a volume and width of said third end chamber, a bottom of said third end chamber having a radius equal to a radius of a bottom of said fourth end chamber, a bottom of said first end chamber having a radius greater than a radius of a bottom of said second end chamber, a bottom of said second end chamber having a radius greater than a radius of a bottom of said third end chamber.
Dependencies are inferred from the claim text.