发明名称 SPARK PLUG
摘要 <p>The present invention provides a spark plug which is capable of suppressing a occurrence of crack and separation by determining a structural configuration of a melting portion formed in a junction portion between a discharge portion and a pedestal portion which form an ignition portion that protrudes from a ground electrode. In a profile line shape of a cross section including a center axis P of an ignition portion 80, an exposure surface 88 of a melting portion 83 connects a side surface 82 of a discharge portion 81 and a side surface 85 of a pedestal portion 84. Further, an exterior angle ¸ formed between an imaginary line Q, which passes through a boundary position X1 between the melting portion 83 and the pedestal portion 84 and a boundary position X2 between the melting portion 83 and the discharge portion 81, and the center axis P at a node C, satisfies 135° ‰¦ ¸ ‰¦ 175°. Furthermore, a proportion T/S of a forming depth T of the melting portion 83 to an outside diameter S of the discharge portion 81 satisfies T/S ‰§ 0.5.</p>
申请公布号 EP2393172(A1) 申请公布日期 2011.12.07
申请号 EP20100735630 申请日期 2010.01.27
申请人 NGK SPARKPLUG CO., LTD. 发明人 MIYASHITA, NAOMICHI;MUSASA, MAMORU;SUZUKI, AKIRA;TORII, KAZUYOSHI;KATO, TOMOAKI
分类号 H01T13/32;H01T13/39 主分类号 H01T13/32
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