Sparkplug cap

Claim 2

A sparkplug cap, comprising a grounded outer metallic sleeve, an inner metallic member being operatively connectable with an ignition cable, a sparkplug having a spark plug gap, a dielectric member separating said inner metallic member and said outer metallic sleeve, said inner metallic member and said outer metallic sleeve with said dielectric member being formed as a capacitor, said capacitor being disposed in parallel to said ignition spark gap, and a noise-suppression resistor operatively electrically connected in series to the parallel combination of said capacitor and said spark gap and arranged before said capacitor with relation to the direction of the ignition current to said spark plug gap.

Claim 3

The sparkplug cap, as set forth in claim 1, wherein said sleeve is a coil spring.

Claim 4

The sparkplug cap, as set forth in claim 1, wherein said sleeve is a metallic fabric.

Claim 5

The sparkplug cap, as set forth in claim 1, wherein said sleeve forms an electrically conductive application or coating.

Claim 6

The sparkplug cap, as set forth in claim 1, wherein said sleeve is electroplated.

Claim 7

A sparkplug cap for sparkplugs having a central electrode and a grounded electrode spaced therefrom forming a spark plug gap, comprising an ignition cable terminal adapted to be connected to an ignition cable, a sparkplug terminal operatively electrically connected to said ignition cable terminal, a plastic insulating body containing said ignition cable terminal and said sparkplug terminal, said sparkplug terminal connectable operatively electrically to said central electrode, a grounded screening shell at least partly surrounding said insulating body, at least one of said terminals being formed to constitute a first capacitor electrode within said insulating body, said screening shell constituting another capacitor electrode, said insulating body constituting a dielectric, said capacitor electrodes and said dielectric forming cooperatively a capacitor of high capacitance connected in parallel to said spark plug gap, a noise-suppression resistor operatively electrically connected In series to the parallel combination of said capacitor and said spark gap and arranged before said capacitor with relation to the direction of the ignition current to said spark plug gap, said first capacitor electrode is formed as a hollow cartridge, and said noise-suppression resistor is arranged within said hollow cartridge.

Claim 8

A sparkplug cap for sparkplugs having a central electrode and a grounded electrode spaced therefrom forming a spark plug gap, comprising an ignition cable terminal adapted to be connected to an ignition cable, a sparkplug terminal operatively electrically connected to said ignition cable terminal, a plastic insulating body containing said ignition cable terminal and said sparkplug terminal, said sparkplug terminal connectable operatively electrically to said central electrode, a grounded screening shell at least partly surrounding said insulating body, at least one of said terminals being formed to constitute a first capacitor electrode within said insulating body, said screening shell constituting another capacitor electrode, said insulating body constituting a dielectric, said capacitor electrodes and said dielectric forming cooperatively a capacitor of high capacitance connected in parallel to said spark plug gap, a noise-suppression resistor operatively electrically connected In series to the parallel combination of said capacitor and said spark gap and arranged before said capacitor with relation to the direction of the ignition current to said spark plug gap, said first capacitor electrode is formed as a hollow cartridge, and said noise-suppression resistor is arranged within said hollow cartridge.

Claim 9

The sparkplug cap, as set forth in claim 6, wherein said noise-suppression resistor is arranged screened in said hollow cartridge.

Claim 10

The sparkplug cap, as set forth in claim 1, wherein said metallic member is enclosed in said dielectric member and is formed as a hollow cartridge.

Claim 11

The sparkplug cap, as set forth in claim 8, wherein said cartridge is a hollow cylinder.

Claim 12

The sparkplug cap, as set forth in claim 1 wherein said capacitor is influenced by the temperature at said sparkplug and having variable capacitance within the range of the temperature variations.

Claim 13

The sparkplug cap, as set forth in claim 1, wherein said inner metallic member is formed as a hollow cartridge, and said noise-suppression resistor is arranged within said hollow cartridge.