| 摘要 |
automobile electrical equipment; multiple-spark ignition systems for internal-combustion engines. SUBSTANCE: spark plug has metal body, insulator with built-in central electrode, and common ground electrode; central electrode has tapered pointed end whose top and foot are spaced from body end through distance of 4.5-11 and 1.5-4 mm, respectively; body proper and common ground electrode are built integral to constitute single part. EFFECT: improved starting characteristics, reduced specific fuel consumption and emission of pollutants into atmosphere; enhanced antiknock properties of engine. 1 cl, 1 dwg
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