| 摘要 |
A spark plug has a shell at one end of an insulator body, a central electrode extending through the insulator body beyond the shell, and a tapered ground electrode secured to the shell and extending alongside the central electrode. The ground electrode, from its point of connection with the shell to its tip, converges gradually toward the central electrode to form a tapered gap between the electrodes. The ground electrode provides a short path for conducting heat readily through the shell to the water jacket area of the engine cylinder block. The gradually tapered gap causes the spark to travel between different points in the gap, depending upon temperature and running conditions of the engine, which reduces wear on the electrodes. The tapered gap also allows good ventilation for gases in the spark gap area thereby reducing corrosion of the electrodes.
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