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    SPARK PLUG
    3.
    发明公开
    SPARK PLUG 审中-公开

    公开(公告)号：EP2634871A4

    公开(公告)日：2014-09-03

    申请号：EP11835746

    申请日：2011-01-11

    申请人： NGK SPARK PLUG CO

    发明人： TANAKA TOMO-O ,  SHIBATA TSUTOMU ,  YOSHIMOTO OSAMU ,  KIKAI TAKAAKI ,  KUNO TAKEHITO ,  NUNOME KENJI

    IPC分类号： H01T13/20 ,  H01T13/39

    CPC分类号： H01T13/39 ,  H01T13/32

    摘要： An object of the invention is to provide a spark plug capable of suppressing the occurrence of cracking with a grain boundary oxidized in an outer layer as the starting point under a cold and/or hot environment while decreasing temperature increase of a ground electrode. A spark plug of the invention including a center electrode and a ground electrode having a gap between the center electrode and the ground electrode in which the ground electrode has at least a core portion and an outer layer covering the core portion, and the core portion is formed from a material having higher thermal conductivity than that of the outer layer, wherein at least a portion in which thickness of the outer layer is 0.5 mm or less exists at a cross-section perpendicular to a direction in which the ground electrode is extended, and the composition of the electrode material forming the outer layer is as follows: Ni is 96 mass% or more, total of at least one kind selected from a group consisting of Y and rare earth elements is 0.05 mass% or more, Al is 0.5 mass% or less, and Si is 0.5 mass% or more and 1.5 mass% or less (here, the total of Ni, Y, rare earth elements, Al, Si does not exceed 100 mass%).

    SPARK PLUG AND MANUFACTURING METHOD THEREFOR
    4.
    发明公开
    SPARK PLUG AND MANUFACTURING METHOD THEREFOR 审中-公开
    SPARK PLUG及其制备方法

    公开(公告)号：EP2658051A4

    公开(公告)日：2014-12-31

    申请号：EP11851707

    申请日：2011-10-06

    申请人： NGK SPARK PLUG CO

    发明人： KIKAI TAKAAKI ,  TANAKA TOMOO ,  SHIBATA TSUTOMU ,  SUZUKI KAORI ,  KUNO TAKEHITO

    IPC分类号： H01T13/32 ,  H01T13/39

    CPC分类号： H01T13/39 ,  H01T13/32 ,  H01T21/02

    摘要： A spark plug (1) includes a ceramic insulator (2) having an axial hole formed therethrough in an axis direction (CL1) of the spark plug, a center electrode (5) inserted in a front side of the axial hole (4), a metal shell (3) disposed around the ceramic insulator (2) and a ground electrode (27) joined to a front end portion of the metal shell (3) in such a manner as to define a gap (28) between the center electrode (5) and the ground electrode (27), wherein the ground electrode (27) has a cross-sectional area of 2.0 mm 2 or smaller in any arbitrary cross section thereof taken in a direction perpendicular to a center line (CL2) of the ground electrode (27); the ground electrode (27) is made of a metal material containing 93 mass% or more of nickel; and the ground electrode (27) has a Vickers hardness of 130 to 260 Hv. In this spark plug where the ground electrode is relatively small in thickness, it is possible to improve both of the deformation resistance and wear resistance of the ground electrode.

    SPARK PLUG
    6.
    发明公开
    SPARK PLUG 审中-公开
    ZÜNDKERZE

    公开(公告)号：EP2554690A4

    公开(公告)日：2013-12-25

    申请号：EP11765169

    申请日：2011-01-18

    申请人： NGK SPARK PLUG CO

    发明人： SHIBATA TSUTOMU ,  TANAKA TOMOO ,  SUMOYAMA DAISUKE ,  KIKAI TAKAAKI

    IPC分类号： C22C5/04 ,  C22C19/03 ,  C22C30/00 ,  F02P13/00 ,  H01T13/39

    CPC分类号： H01T13/39 ,  C22C5/04 ,  C22C30/00 ,  F02P15/00

    摘要： [Objective] An objective of the present invention is to provide a technique which can improve resistance to spark ablation of an electrode tip whose predominant component is Pd and restrains occurrence of separation and cracking of the electrode tip. [Means for solution] The electrode tip located at an distal end of an electrode of a spark plug contains Pd as a predominant component in an amount of 40 wt.% or more; at least one element of Ir, Ni, Co, and Fe, wherein, when the tip contains Ir, the amount of Ir is 0.5 wt.% to 20 wt.%, and when the tip contains at least one element of Ni, Co, and Fe, the amount of the at least one element is 0.5 wt.% to 40 wt.%; and at least one element of Pt, Re, Rh, and Ru in a total amount of 5 wt.% to 40 wt.%, wherein when the tip contains at least one element of Re, Rh, and Ru, the amount of the at least one element is 10 wt.% or less, and when the tip contains Pt, the amount of Pt is 16 wt.% to 40 wt.%.

    摘要翻译： [目的]本发明的目的在于提供一种技术，其能够提高以Pd为主要成分的电极头的电火花烧蚀抵抗性，抑制电极头发生分离，破裂。 [解决手段]位于火花塞的电极的前端的电极头以40重量％以上的量含有作为主要成分的Pd， Ir，Ni，Co和Fe中的至少一种元素，其中当尖端包含Ir时，Ir的量为0.5重量％至20重量％，并且当尖端包含至少一种Ni元素时，Co 和Fe，所述至少一种元素的量为0.5重量％至40重量％; 以及总量为5重量％至40重量％的Pt，Re，Rh和Ru中的至少一种元素，其中当所述尖端含有Re，Rh和Ru中的至少一种元素时，所述 至少一种元素为10重量％或更少，并且当尖端含有Pt时，Pt的量为16重量％至40重量％。