PLASMA-JET SPARK PLUG, AND MANUFACTURING METHOD THEREOF

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PROBLEM TO BE SOLVED : To provide a plasma-jet spark plug and a manufacturing method thereof, making energy of plasma leaking into a gap or the like between an insulator and a grounding electrode arranged on a tip side of the insulator to be reduced, as well as capable of preventing the insulator from being strongly in contact with the grounding electrode. SOLUTION : An electrode base material 33 structuring a grounding electrode 30 is arranged and connected to an engagement step part 57 of a main fitting 50 with an insulator 10 retained. At that time, a rare-metal chip 36 with a flange-like outwardly projecting part 37 is arranged at a communication part 31 beforehand. Then, if the rare-metal chip 36 is connected with the electrode base material 33 while being pressed toward a tip part 16 of the insulator 10, the gap between the grounding electrode 30 (the electrode base material 33) and the tip part 16 of the insulator 10 can be closed by the rare-metal chip 36, thus energy of plasma formed at a cavity 60 does not leak. COPYRIGHT : (C)2010, JPO&INPIT