Multi-filament radio frequency sparking type spark plug for positive ignition thermal engine, has starter arranged in determined zone such that rupture of body under pressure does not present risks for operator during tightening process

摘要

The plug has an insulator containing insulating gas subjected to high pressure and occupying tubular volume of a cylindrical body, where the plug is adapted to be tightened in a cylinder head of a thermal engine according to couple. A part of the body comprises a rupture starter (28) adapted to break the body that is subjected to the couple higher than rupture couple. The starter is arranged in a determined zone of the body such that rupture of the body under pressure does not present risks for an operator during the tightening process.