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    • 3. 发明授权
    • ZÜNDKERZE MIT GLEITFUNKENSTRECKE
    • SPARK插头与表面放电部分
    • EP0311608B1
    • 1991-10-16
    • EP87903248.0
    • 1987-05-23
    • ROBERT BOSCH GMBH
    • FRIESE, Karl-HermannGRÜNWALD, WernerSCHMID, Kurt
    • H01T13/52
    • H01T13/52
    • Spark plug, for use in an internal combustion engine, having an insulating body provided with a central electrode in the end portion facing the combustion chamber, said central electrode being connected to an electrically conductive mass located inside the insulating body, and with a counter-electrode and a surface discharge section between the central electrode and the counter-electrode. The central electrodes and surface discharge section consist of an electrically non-conductive one-piece ceramic which carries on its surface, in the region of the insulating body and the counter-electrode, an electrically-conductive layer and in the region of the surface discharge section a layer which after sintering has no intrinsic conductivity, and allows high displacement currents. The electrically non-conductive ceramic consists preferably of Al2O3, the electrically conductive layer on the ceramic consists of platinum or a platinum/Al2O3 mixture with at least 60 % platinum by weight and the layer of the surface discharge section consists of a platinum/Al2O3 mixture with a maximum of 40 % platinum by weight.