Federal-Mogul Corporation

Other

Federal-Mogul Ignition Company

Federal-Mogul Ignition Gmbh

Tennecoinc.

Tenneco Gmbh

Giulio Milan

Massimo Augusto Dal Re

Paolo Pignatti

Vittorio Urciuoli

Stefano Papi

Kristapher I Mixell

Paul William Phillips

Giovanni Betti Beneventi

Christian Sforzina

Alessio Di Giuseppe

A corona igniter assembly which is designed to reduce the amount of air gaps between insulating components and thus reduce electrical fields concentrated in those air gaps and the associated unwanted corona discharge. The assembly includes a high voltage center electrode surrounded by a ceramic insulator and a high voltage insulator. A dielectric compliant insulator is disposed between the ceramic insulator and the high voltage insulator. A layer of metal is applied to at least one of the insulators, for example the ceramic insulator. A compliant collet formed of a partially resistive material covers a sharp edge of the layer of metal to reduce the electric field and smooth the electric field distribution at the sharp edge of the metal layer.

Shaped collet for electrical stress grading in corona ignition systems

A corona igniter assemblycomprises an ignition coil assembly, a firing end assembly, and a metal tubeconnecting the ignition coil assemblyto the firing end assembly. A rubber bootis disposed in the metal tubeand compressed symmetrically between a coil output memberof the ignition coil assemblyand an insulatorof the firing end assembly. Thus, the rubber bootfills any air gaps and provides a hermetic seal between the ignition coil assemblyand the firing end assemblyto prevent unwanted corona discharge from forming from those air gaps.

High voltage connection sealing method for corona ignition coil

A corona ignition assembly comprising a plurality of different insulators disposed between an ignition coil assembly and firing end assembly is provided. A high voltage center electrode extends longitudinally between an igniter central electrode and the ignition coil assembly. A high voltage insulator formed of a fluoropolymer surrounds the high voltage center electrode, and a firing end insulator formed of alumina surrounds the igniter central electrode. According to one embodiment, a glue formed of a compliant and insulating material, such as a silicon-based material, forms a seal between the high voltage insulator and the firing end insulator. According to another embodiment, a dielectric compliant insulator is disposed between the high voltage insulator and the ignition coil assembly, and the glue forms a seal therebetween. The glue fills air gaps to prevent unwanted corona discharge, and thus extends the life of the materials and directs energy to the firing end.

Corona suppression at materials interface through gluing of the components

A corona ignition assembly comprising a plurality of different insulators disposed between an ignition coil assembly and firing end assembly is provided. A high voltage center electrode extends longitudinally between an igniter central electrode and the ignition coil assembly. A high voltage insulator formed of a fluoropolymer surrounds the high voltage center electrode, and a firing end insulator firing of alumina surrounds the igniter central electrode. A sleeve formed of a semi-conductive and complaint material, such as silicone rubber with conductive filler, is disposed radially between the electrodes and adjacent insulators. The sleeve fills air gaps and minimizes the peak electric field within the corona igniter assembly. The sleeve is able to prevent unwanted corona discharge, and thus extends the life of the materials and directs energy to the firing end.

Corona suppression at the high voltage joint through introduction of a semi-conductive sleeve between the central electrode and the dissimilar insulating materials

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Northville, MI, United States of America

Giulio Milan