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    • 4. 发明申请
    • SPARK PLUG WITH SURFACE DISCHARGE SECTION
    • SPARK插头与表面放电部分
    • WO1987007094A1
    • 1987-11-19
    • PCT/DE1987000202
    • 1987-05-06
    • ROBERT BOSCH GMBHBENEDIKT, WalterHERDEN, WernerSCHMATZ, JürgenSCHWAB, Siegbert
    • ROBERT BOSCH GMBH
    • H01T13/52
    • H01T13/52
    • A spark plug with a surface discharge section for internal combustion engines is provided with a spark plug barrel (11) with an annular earthed electrode (15), an insulating body (10) surrounded by the barrel (11) on a longitudinal section and a central electrode (19) housed in a through-hole (16) in the insulating body (10), and exposed on the combustion chamber side. The surface discharge section is formed between the central electrode (19) and the earthed electrode (15) along a discharge path on the surface of the insulating body (10). In order to obtain a low plug capacity with a highly dielectric discharge path, the insulating body (10) is provided at least in the end section of the combustion chamber side with at least two coaxial material layers (21, 22) which are totally or partially adjacent to one another in the radial direction and having highly different dielectric constance.
    • 具有用于内燃机的表面放电部分的火花塞设置有具有环形接地电极(15)的火花塞筒(11),在纵向部分上被筒体(11)包围的绝缘体(10) 中心电极(19)容纳在绝缘体(10)中的通孔(16)中,并暴露在燃烧室侧。 表面放电部分沿绝缘体(10)的表面上的放电路径形成在中心电极(19)和接地电极(15)之间。 为了获得具有高电介质放电路径的低插头容量,绝缘体(10)至少在燃烧室侧端部设置有至少两个同轴材料层(21,22),该至少两个同轴材料层(21,22) 在径向上彼此部分相邻并且具有高度不同的介电常数。