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    • 75. 发明授权
    • Sparkplug for internal combustion engine
    • 内燃机用火花塞
    • US4406968A
    • 1983-09-27
    • US297353
    • 1981-08-28
    • Karl-Hermann FrieseRudolf Pollner
    • Karl-Hermann FrieseRudolf Pollner
    • H01T13/20H01T13/34H01T21/02
    • H01T21/02H01T13/34
    • A sparkplug for internal combustion engines which has a central electrode extending to the ignition end. The central electrode has an electrically non-conductive core pin with an electrically conductive outer layer on the cylindrical surface of the core pin. The central electrode is positioned in the lengthwise bore of the sparkplug insulator portion, preferably without any clearance between the insulator and the ignition end portion of the central electrode. The core pin is preferably made of a material which has shrinkage characteristics and a thermal coefficient of expansion substantially the same as those of the insulator. Most preferably the same material is used for both components. The electrically conductive coating layer of the central electrode is preferably a conductive metal-ceramic mixture. The coating layer may be in the form of a resistance element and/or contain a pre-ignition discharge gap. The sparkplug may also be formed with a recessed electrically conductive coating portion of the central electrode to form a surface gap sparkplug.
    • 用于内燃机的火花塞,其具有延伸到点火端的中心电极。 中心电极具有在芯销的圆柱形表面上具有导电外层的非导电芯销。 中心电极定位在火花塞绝缘体部分的纵向孔中,优选地在绝缘体和中心电极的点火端部之间没有任何间隙。 芯销优选由具有收缩特性和与绝缘体基本上相同的热膨胀系数的材料制成。 最优选地,相同的材料用于两种组分。 中心电极的导电涂层优选为导电金属 - 陶瓷混合物。 涂层可以是电阻元件的形式和/或包含预点火放电间隙。 火花塞也可以形成有中心电极的凹入的导电涂覆部分,以形成表面间隙火花塞。