Plasma jet ignition plug
AssigneeNgk Spark Plug Co., Ltd.
InventorsDaisuke Nakano, Yoshikuni Sato, Hiroyuki Kameda, Naohumi Yamamura, Daisuke Kasahara
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Abstract
A plasma jet ignition plug including a wire-wound resistor for restraining the radiation of noise while allowing application of a sufficiently large current for generation of plasma to a spark discharge gap at the time of ignition. The wire-wound resistor having an inductance of 1 μH to 100 μH inclusive and a resistance of 1Ω or less, and is provided on at least one of a center electrode and a ground electrode. The wire-wound resistor restrains current which is generated by the influence of stray capacitance present in the plasma jet ignition plug, thereby reducing noise.
Claims3
A plasma jet ignition plug comprising:
- an insulator having an axial hole extending in an axial direction,
- a center electrode disposed within the axial hole of the insulator,
- a substantially tubular metallic shell disposed radially outward of the insulator,
- a ground electrode defining a spark discharge gap in cooperation with the center electrode, wherein a front end of the center electrode is located rearward of a front end of the insulator with respect to the ground electrode, and
- a resistor incorporated into a front end portion of the plasma jet ignition plug, said resistor electrically connected to at least one of the center electrode and the ground electrode and having an inductance of 1 μH to 100 μH inclusive and a resistance of 1Ω or less, but greater than 0Ω.
Dependencies are inferred from the claim text.