| 摘要 |
The invention concerns a spark plug (1) for a motor vehicle internal combustion engine, substantially elongated in shape, comprising: two coaxial electrodes: an inner electrode (D) called central electrode (3) and an outer electrode called base (2) enclosing the central electrode (3); an electrically insulating annular block, called insulation (4) interposed between the central electrode (3) and the base (2) having an annular shoulder (5). The invention is characterized in that the insulation (4) comprises an annular groove (8) located at the shoulder (5). |
