SPARK PLUG
PROBLEM TO BE SOLVED: To provide an excellent spark plug achieving reduction of noise and suppression of electrode wear by decreasing electrostatic capacitance, without causing deterioration of withstand voltage, while satisfying requirements for a reduced diameter and achieving both suppression of...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To provide an excellent spark plug achieving reduction of noise and suppression of electrode wear by decreasing electrostatic capacitance, without causing deterioration of withstand voltage, while satisfying requirements for a reduced diameter and achieving both suppression of preignition and suppression of smoldering.SOLUTION: In a spark plug 100, at least a diameter Dof a high heat conduction part 11 is smaller than a diameter Dof a resistive element 14, and a glass leg part 20 includes a glass leg vertical part 203 exposing from a projecting latching part 34 so as to extend vertically with a constant diameter Dbeing maintained.
【課題】細径化の要求を満足しつつ、プレイグニションの抑制とくすぶりの抑制との両立を図りつつ、耐電圧の低下を伴うことなく、静電容量の低下により、ノイズの低減と電極消耗の抑制とを図った優れた点火プラグを提供する。【解決手段】 点火プラグ１００は、少なくとも、高熱伝導部１１の直径φＤ１を抵抗体１４の直径φＤ３よりも径小とすると共に、碍子脚部２０が一定の直径φＤ２を維持したまま垂直に延びるように突状係止部３４から露出する碍子脚部垂直部２０３を具備する。【選択図】 図２ |
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