公开(公告)号：US07109646B2

公开(公告)日：2006-09-19

申请号：US10730885

申请日：2003-12-10

申请人： Hitoshi Morita ,  Shinichi Okabe ,  Masamichi Shibata ,  Tsunenobu Hori

发明人： Hitoshi Morita ,  Shinichi Okabe ,  Masamichi Shibata ,  Tsunenobu Hori

IPC分类号： H01T13/20

CPC分类号： H01T13/20 ,  H01T13/39

摘要： A spark plug is composed of a main metal fitting having a cylindrical structure, an insulator disposed inside the cylindrical main metal fitting, a center electrode fitted in the insulator in a manner that a front end portion of the center electrode projects outward over one end of the insulator, and a grounding electrode mounted to the main metal fitting and having one end portion opposing to the front end portion of the center electrode through a discharge gap therebetween. The front end portion of the center electrode includes a conical portion having a tapered surface having a taper angle of less than 80°, and a columnar portion formed to a top end portion of the conical portion so as to have a diameter in a range of 0.4 mm to 0.8 mm.

摘要翻译： 火花塞由具有圆柱形结构的主金属配件，设置在圆筒形主金属配件内部的绝缘体组成，中心电极以这样的方式装配在绝缘体中，使得中心电极的前端部分在 绝缘体和安装在主金属配件上的接地电极，并具有通过其间的放电间隙与中心电极的前端部相对的一端部。 中心电极的前端部分包括具有锥形角小于80°的锥形表面的圆锥形部分和形成在锥形部分的顶端部分上的直径在一定范围内的圆柱形部分 0.4mm至0.8mm。

公开(公告)号：US06853116B2

公开(公告)日：2005-02-08

申请号：US10066606

申请日：2002-02-06

申请人： Tsunenobu Hori ,  Keiji Kanao

发明人： Tsunenobu Hori ,  Keiji Kanao

IPC分类号： F02P13/00 ,  H01T13/20 ,  H01T13/32 ,  H01T13/39 ,  H01T21/02

CPC分类号： H01T13/39 ,  H01T21/02

摘要： An improved structure of a spark plug which provides higher durability and ignitability of a gaseous fuel. The spark plug consists of a center electrode, a ground electrode, a noble metal chip joined to a center electrode-opposed surface of the ground electrode by laser welding, and a fused portion that forms a weld of the noble metal chip and the ground electrode formed by materials of the ground electrode and the noble metal chip melted together. A sectional area of the noble metal chip traversing a length thereof is between 0.1 mm2 and 0.6 mm2. An unfused sectional area percentage that is a percentage of a sectional area of an unfused portion of a joined end of the noble metal chip within a range of a sectional area of the noble metal chip closest to the fused portion traversing the length of the noble metal chip is less than or equal to 50%. A melt angle that is an angle which a line extending through the fused portion along a maximum depth of the fused portion makes with the center electrode-opposed surface of the ground electrode is less than or equal to 60°.

摘要翻译： 火花塞的改进的结构，其提供气体燃料的更高的耐久性和可燃性。 火花塞由中心电极，接地电极，通过激光焊接而与接地电极的中心电极对置面接合的贵金属芯片，以及形成贵金属芯片和接地电极的焊接部的熔接部 由接地电极和贵金属芯片的材料形成熔融在一起。 穿过其长度的贵金属片的截面积在0.1mm 2和0.6mm 2之间。 贵金属芯片的接合端的未熔合部分的截面积的百分比在最接近穿过贵金属的长度的熔融部分的贵金属芯片的截面积范围内的未界定截面积百分比 芯片小于等于50％。 沿着熔融部分的最大深度延伸通过熔融部分的线与接地电极的中心电极相对表面形成的角度的熔融角小于或等于60°。

公开(公告)号：US06831397B2

公开(公告)日：2004-12-14

申请号：US10058430

申请日：2002-01-30

申请人： Keiji Kanao ,  Tsunenobu Hori

发明人： Keiji Kanao ,  Tsunenobu Hori

IPC分类号： H01T1320

CPC分类号： H01T21/02 ,  H01T13/39

摘要： A noble metal chip of which one end is welded to an earth electrode by laser has a sectional area of not less than 0.12 mm2 and not more than 1.15 mm2 at the other end. A length from the surface of the earth electrode to the top surface of the noble metal chip is not less than 0.3 mm and not more than 1.5 mm. An outer surface of the fused junction layer obtained by laser welding between the noble metal chip and the earth electrode has a concave surface, wherein the slope on the plane including the axis of the noble metal chip is curved with a radius R.

摘要翻译： 通过激光将一端焊接到接地电极的贵金属芯片在另一端具有不小于0.12mm 2且不大于1.15mm 2的截面积。 从接地电极的表面到贵金属芯片的上表面的长度不小于0.3mm且不大于1.5mm。 通过在贵金属芯片和接地电极之间的激光焊接而获得的熔融接合层的外表面具有凹面，其中包含贵金属芯片的轴线的平面上的斜率以半径R弯曲

公开(公告)号：US06794804B2

公开(公告)日：2004-09-21

申请号：US10225459

申请日：2002-08-22

申请人： Keiji Kanao ,  Tsunenobu Hori

发明人： Keiji Kanao ,  Tsunenobu Hori

IPC分类号： H01T124

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

摘要： A spark plug and a production method thereof is provided which is designed to improve the high temperature oxidation resistance of a ground electrode without sacrificing the mechanical strength of a weld of the ground electrode with a metal shell. The ground electrode is made of a Ni-based alloy containing 10% or more by weight of Cr and 1.5% or more by weight of Al and joined to the metal shell by resistance welding in a substantially oxygen free atmosphere.

摘要翻译： 提供了一种火花塞及其制造方法，其设计成可以在不牺牲接地电极与金属壳的焊接的机械强度的情况下提高接地电极的耐高温氧化性。 接地电极由含有10重量％以上的Cr和1.5重量％以上的Al的Ni系合金构成，通过在大致无氧气氛下的电阻焊接而与金属壳接合。