Spark plug for gasoline engines, has annular shoulder limited by bore and is arranged in front of front end of insulator, where distance between front end of insulator and upper inner edge of annular shoulder is more than electrode distance

摘要

The spark plug has an elongated hollow body (1) made of metal, whose front end is provided with a front end and a rear end. An annular shoulder (9) is limited by a bore (19) and is arranged in front of a front end (16) of an insulator (2). The distance between the front end of the insulator and the upper inner edge of the annular shoulder amounts to 1.2 times the distance between the electrodes. The distance of the exposed front end of the insulator from the metallic body is greater than or equal to 1.2 times the distance between electrodes.