Spark plug for vehicle engine comprises hollow housing, an insulator fitting in the housing, central electrode fitting in the insulator and having front end section protruding over end section of the insulator and earth electrode

摘要

Spark plug comprises housing (10) having hollow section, insulator (20) fitting in housing having axial bore, central electrode (30) fitting in insulator having front end section (31) protruding over insulator end section (21), and earth electrode (40) connected to end of housing having front end surface facing central electrode lateral surface to provide spark discharge gap. Earth electrode front end surface has area of 0.07-1.13 mm2.