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    SPARK PLUG
    1.
    发明公开
    SPARK PLUG 审中-公开
    ZÜNDKERZE

    公开(公告)号：EP2383847A4

    公开(公告)日：2015-04-22

    申请号：EP09834871

    申请日：2009-12-22

    申请人： NGK SPARK PLUG CO

    发明人： KYUNO JIRO ,  SUZUKI AKIRA ,  MUSASA MAMORU

    IPC分类号： H01T13/36 ,  H01T13/16 ,  H01T13/20

    CPC分类号： H01T13/36 ,  H01T13/16

    摘要： [Objective] To provide a spark plug which is configured such that an insulation member, from which a center electrode projects, is pressed frontward and held in a metallic shell, and is fixed by means of crimping the rear end of the metallic shell, and which can prevent a drop in gastightness between the metallic shell and the insulation member due to a difference in thermal expansion therebetween. [Means for Solution] In a spark plug in which a mating shaft portion (10) of an insulation member (1) is loose-fitted into a mating hole portion (30) of a metallic shell (21), a filler (41) for maintaining gastightness is charged between the outer circumferential surface of the mating shaft portion (10) and the inner circumferential surface of the mating hole portion (30). Despite the thermal expansion difference, the gastightness is maintained, because the filler (41) for maintaining gastightness is charged between the inner and outer circumferential surfaces.

    摘要翻译： [目的]提供一种火花塞，其构造成使得中心电极突出的绝缘构件被向前按压并保持在金属壳中，并且通过压接金属壳的后端固定，以及 这可以防止由于它们之间的热膨胀差异而在金属壳和绝缘构件之间的气密性降低。 [解决方案]在将绝缘构件（1）的配合轴部分（10）松配合到金属壳（21）的配合孔部分（30）中的火花塞中，填充物（41） 为了保持气密性，在配合轴部（10）的外周面与配合孔部（30）的内​​周面之间进行充填。 尽管存在热膨胀差异，但是由于用于保持气密性的填充物（41）被填充在内周面和外周面之间，因此保持气密性。

    SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING THE SAME
    3.
    发明公开
    SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING THE SAME 有权
    SPARK PLUG用于生产内燃机及方法

    公开(公告)号：EP2234226A4

    公开(公告)日：2014-11-12

    申请号：EP08869682

    申请日：2008-12-24

    申请人： NGK SPARK PLUG CO

    发明人： MUSASA MAMORU ,  SUZUKI AKIRA ,  YOSHIMOTO OSAMU

    IPC分类号： H01T13/39 ,  C22C5/04

    CPC分类号： H01T13/39 ,  C22C1/0466 ,  C22C5/04 ,  C22C9/00 ,  C22C19/03 ,  C22C32/0021 ,  H01T13/32 ,  H01T21/02 ,  Y10T29/49002

    摘要： An object of the present invention is to provide a spark plug capable of preventing a separation of a noble metal tip and extending a service-life of the spark plug. A spark plug 1 is provided with an insulator 2, a metal shell 3, a center electrode 5 and a ground electrode 27. The ground electrode 27 includes a ground electrode main body 38 and a convex portion 34 which projects from a front end side face of the ground electrode main body 38. A noble metal tip 32 is joined to a front end face (contact face 36) of the convex portion 34. A projection length L from the ground electrode main body 38 to a front end face 37 of the noble metal tip 32 falls within the range from 0.4 mm or more to 1.6 mm or less. The noble metal tip 32 is made of a Pt alloy containing Pt as a principal component. The Pt alloy is formed so that a mean particle size thereof is 70 micrometers after being heated at 1100 degrees C under an air atmosphere for 50 hours. The Pt alloy contains at least one kind of component selected from Rh, Ir, Ni and Ru.

    METHOD OF MANUFACTURING SPARK PLUG
    5.
    发明公开
    METHOD OF MANUFACTURING SPARK PLUG 审中-公开

    公开(公告)号：EP2278671A4

    公开(公告)日：2014-03-26

    申请号：EP09733721

    申请日：2009-04-22

    申请人： NGK SPARK PLUG CO

    发明人： MUSASA MAMORU ,  SUZUKI AKIRA

    IPC分类号： H01T13/20 ,  H01T13/46 ,  H01T21/02

    CPC分类号： H01T13/467 ,  H01T21/02

    摘要： To provide a method of producing a spark plug in which a spark discharge gap with a suitable distance can easily be obtained without bending to deform a ground electrode in a direction in which the ground electrode moves towards or away from a metal tip of a center electrode, in the method of producing a spark plug, when a metal tip (a noble metal tip) 21 is welded to a front end portion 13a of a center electrode 13, the metal tip 21 is welded to the front end portion 13a of the center electrode 13 after a state is established in which the metal tip 21 alone is positioned in a radial direction where a predetermined spark discharge gap g is formed relative to a distal end portion 14b of a ground electrode 14 which is joined to a metal shell 11 at a proximal end portion 14a thereof.

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

    公开(公告)号：EP2477287A4

    公开(公告)日：2013-11-27

    申请号：EP10815104

    申请日：2010-08-04

    申请人： NGK SPARK PLUG CO

    发明人： SUZUKI AKIRA ,  MUSASA MAMORU

    IPC分类号： H01T13/39 ,  F02P13/00 ,  H01T13/20 ,  H01T21/02

    CPC分类号： H01T13/39 ,  F02P13/00 ,  H01T13/32 ,  H01T21/02

    摘要： Problem is to enhance the welding strength when a projecting shape section is resistance-welded to a ground electrode. A ground electrode 30 includes a ground electrode base material 35 and a projecting shape section 36. The projecting shape section 36 is connected by resistance welding to an opposite surface 32 of the ground electrode 30 so as to be opposite and project towards the leading end of a center electrode 20. The ground electrode base material 35 and the projecting shape section 36 are formed from a material that is composed of the same metal (for example, nickel) as a main component and have a relation of formulas (1) and (2) described below. In formula (1), the specific resistance of the ground electrode base material 35 is R (µ©cm) and the specific resistance of the projecting shape section 36 is S (µ©cm). The specific resistance R > the specific resistance S...(formula 1), the specific resistance R - specific resistance S‰¥ 20...(formula 2). Accordingly, fusion of the ground electrode base material 35 that has a larger volume than that of the projecting shape section 36 can be expedited and the welding strength can be enhanced.

    SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD FOR MANUFACTURING SAME
    9.
    发明公开
    SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD FOR MANUFACTURING SAME 审中-公开
    SPARK PLUG用于生产内燃机和方法

    公开(公告)号：EP2472682A4

    公开(公告)日：2014-04-16

    申请号：EP10811599

    申请日：2010-06-23

    申请人： NGK SPARK PLUG CO

    发明人： SUZUKI AKIRA ,  NAKAMURA MAI ,  MUSASA MAMORU

    IPC分类号： H01T13/36 ,  F02P13/00 ,  H01T21/02

    CPC分类号： H01T13/36 ,  F02P13/00 ,  H01T21/02

    摘要： A generation of a stress corrosion cracking is prevented in a middle section. The spark plug 1 includes an insulator 2 that extends along an axis CL1 direction and a metal shell 3. The metal shell 3 includes a middle section 41 that is positioned between a collar section 16 and a tool engaging section 19. The middle section 41 has a bulged section 42 that bulges towards both the inside and the outside in the diametrical direction, a first slender section 43 that is the most slender at a portion that is positioned further to the rear end side in the axis CL1 dircetion than the bulged section 42 and a second slender section 44 that is the most slender at a portion that is positioned further to the leading end side in the axis CL1 direction than the bulged section 42 and the bulged section 42 has the most bulged section 42M that bulges toward the most inside of diametrical direction. In a cross-section that includes the axis CL1, when the distance between both slender sections 43 and 44 along the axis CL1 is F (mm) and the bulged amount to the inside in diametrical direction of the most bulged section 42M with respect to an imaginary line that connects a portion that is positioned furthest to the inside in diametrical direction of both slender sections 43 and 44 is G (mm), 0.00

    SPARK PLUG AND METHOD FOR MANUFACTURING THE SAME
    10.
    发明公开
    SPARK PLUG AND METHOD FOR MANUFACTURING THE SAME 审中-公开

    公开(公告)号：EP2352212A4

    公开(公告)日：2014-03-19

    申请号：EP09824798

    申请日：2009-11-04

    申请人： NGK SPARK PLUG CO

    发明人： SUZUKI AKIRA ,  MUSASA MAMORU

    IPC分类号： H01T13/20 ,  H01T13/32

    CPC分类号： H01T13/32 ,  H01T21/02

    摘要： According to the invention, it is provided a spark plug capable of increasing a welding strength between a leading end of a metal shell and a base end of a ground electrode to prevent fracture of a welded part due to vibrations and the like even when reducing a diameter of the metal shell. The spark plug 100 satisfies a relation of S2 ‰§ S wherein S2 is a sectional area of the welded part between the metal shell 11 and the ground electrode 14, the sectional area S2 being cut off by a plane including a leading end surface of the metal shell 11, and S is a sectional area of the ground electrode 14, the sectional area S being cut off by a plane passing to the most leading end of a boundary in the axial direction between the ground electrode 14 and the welded part and perpendicular to the axial direction.