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    • 3. 发明专利
    • Spark plug
    • SPARK插头
    • JP2011054418A
    • 2011-03-17
    • JP2009202381
    • 2009-09-02
    • Ngk Spark Plug Co Ltd日本特殊陶業株式会社
    • BAN KENJISUZUKI AKIRA
    • H01T13/20F02P13/00H01T13/14H01T13/16
    • H01T13/20F02P13/00H01T13/14H01T13/39
    • PROBLEM TO BE SOLVED: To improve pollution resistance and heat resistance in a spark plug having a center electrode with its diameter narrowed. SOLUTION: The spark plug 1 is provided with a center electrode 5, an insulator 2, and a main metal fitting 3. The insulator 2 is provided with a leg part 13, a tapered part 14 and a middle body part 12. The maximum outer diameter at a site arranged in the leg part 13 of the center electrode 5 is to be 3.0 mm or less. On an inner periphery of the main metal fitting 3, a stepped part 21 and a tip-side inner peripheral part 51 are formed. The tapered part 14 is locked to the stepped part 21. When a volume of a part from a tip to a rear end side within 2 mm of the insulator 2 along an axis line CL1 direction is denoted by A(mm 3 ), and a volume of a part placed from a rear end to a tip side of a site locked to the stepped part 21 of the tapered part 14 and with a diameter difference between the tip side inner peripheral part 51 and an outer peripheral part of itself of 1.5 mm or less is denoted by B(mm 3 ), the following relation is satisfied: 0.12≤A/B≤0.24. COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:提高具有其直径变窄的中心电极的火花塞中的耐污染性和耐热性。 火花塞1设置有中心电极5,绝缘体2和主金属配件3.绝缘体2设置有腿部13,锥形部14和中间本体部12。 布置在中心电极5的腿部13中的部位的最大外径为3.0mm以下。 在主金属配件3的内周上形成台阶部21和前端侧内周部51。 锥形部分14被锁定到阶梯部分21.当从绝缘体2沿轴线CL1方向的2mm以内的尖端到后端侧的部分的体积由A(mm 3 < / SP>),以及从锁定在锥形部14的台阶部21的位置的后端到顶端侧的部分的体积,以及前端侧内周部51与外侧的直径差 1.5mm以下的周边部分由B(mm 3 )表示,满足以下关系:0.12≤A/B≤0.24。 版权所有(C)2011,JPO&INPIT