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    • 41. 发明授权
    • Method for securing a metal noble tip to an electrode of a spark plug using a resistance and laser welding process
    • 一种使用电阻和激光焊接方法将金属高贵尖端固定到火花塞的电极的方法
    • US07666047B2
    • 2010-02-23
    • US10565902
    • 2004-11-18
    • Akira SuzukiTomoaki KatoKazuyoshi ToriiAkikazu Taido
    • Akira SuzukiTomoaki KatoKazuyoshi ToriiAkikazu Taido
    • H01T1/22H01T21/00H01T21/02
    • H01T21/02H01T13/20H01T13/39
    • There is provided a method for producing a spark plug in which welding strength between a noble metal tip and an electrode joined by laser welding can be restrained from becoming weak.A noble metal tip (90) to be joined to a center electrode (2) or ground electrode of a spark plug to form a spark discharge gap is resistance-welded to each electrode containing no noble metal and then laser-welded. In the noble metal tip (90) exposed under a severe environment involving spark discharge, a molten portion (80) formed in such a manner that a portion of the noble metal tip (90) and a portion of the electrode are melted by laser welding and a non-molten portion (95) on the noble metal tip (90) side are apt to be peeled from each other in a boundary surface (83) between the molten portion (80) and the non-molten portion (95). The noble metal content in the molten portion (80) however becomes higher because a flange portion is formed in a bottom portion by pressing force applied on the noble metal tip (90) at the time of resistance welding and then irradiated with a laser beam. Accordingly, peeling can be prevented from occurring in the boundary surface (83).
    • 提供一种用于制造火花塞的方法,其中可以抑制贵金属电极头和通过激光焊接接合的电极之间的焊接强度变弱。 要连接到火花塞的中心电极(2)或接地电极以形成火花放电间隙的贵金属端头(90)被电阻焊接到不含贵金属的每个电极上,然后被激光焊接。 在涉及火花放电的恶劣环境下露出的贵金属电极头(90)中,以使得贵金属电极头(90)的一部分和电极的一部分通过激光焊接而熔化的方式形成的熔融部(80) 并且在熔融部分(80)和非熔融部分(95)之间的边界表面(83)中,在贵金属端头(90)侧上的非熔融部分(95)易于彼此剥离。 然而,熔融部分(80)中的贵金属含量变高,因为通过在电阻焊接时施加在贵金属电极头(90)上的压力而在底部形成凸缘部分,然后用激光束照射。 因此,能够防止在边界面(83)发生剥离。
    • 43. 发明申请
    • Spark plug and method for producing spark plug
    • 火花塞和火花塞生产方法
    • US20070080618A1
    • 2007-04-12
    • US11545490
    • 2006-10-11
    • Kazuyoshi ToriiKazumasa YoshidaWataru Matsutani
    • Kazuyoshi ToriiKazumasa YoshidaWataru Matsutani
    • H01T13/20
    • H01T21/02H01T13/32
    • A spark plug comprising: a center electrode extending in a direction of an axis of said spark plug; a cylindrical insulator which has a shaft hole, and which holds said center electrode in said shaft hole in a state where a tip end of said center electrode is projected from a tip end face of said insulator; a metal shell which holds said insulator; and a ground electrode in which one end is joined to a tip end face of said metal shell, and which extends from said one end toward another end, wherein said ground electrode has an inner side face which faces said center electrode, and an outer side face which is a back face with respect to said inner side face, said outer side face is formed as an arcuately curved face when viewed from a side of said another end in an extending direction of said ground electrode, and a columnar noble metal tip is joined to said inner side face.
    • 一种火花塞,包括:沿所述火花塞的轴线方向延伸的中心电极; 圆柱形绝缘体,其具有轴孔,并且在所述中心电极的前端从所述绝缘体的前端面突出的状态下将所述中心电极保持在所述轴孔中; 保持所述绝缘体的金属外壳; 以及接地电极,其一端接合到所述金属壳的前端面,并且从所述一端向另一端延伸,其中所述接地电极具有面向所述中心电极的内侧面,外侧 面是相对于所述内侧面的背面,当从所述另一端的侧面沿着所述接地电极的延伸方向观察时,所述外侧面形成为弧形弯曲面,柱状贵金属电极头为 连接到所述内侧面。
    • 44. 发明申请
    • Spark plug and method for manufacturing the spark plug
    • 火花塞和火花塞的制造方法
    • US20060238092A1
    • 2006-10-26
    • US11451469
    • 2006-06-13
    • Hideki TeramuraTomoaki KatoKazuyoshi Torii
    • Hideki TeramuraTomoaki KatoKazuyoshi Torii
    • H01T13/20
    • H01T13/32H01T21/02
    • A ground-electrode spark portion 32 is formed from a noble metal which contains Pt as a main component, and is joined to a main metal portion of the ground electrode 4 via an alloy layer which has a thickness ranging from 0.5 μm to 100 μm and in which the noble metal that constitutes the ground-electrode spark portion 32 and the metal that constitutes the main metal portion of the ground electrode 4 are alloyed with each other. The ground-electrode spark portion 32 is configured such that a distal end surface 32t facing a spark discharge gap g is smaller in diameter than a bottom surface 32u joined to the ground electrode 4; and the distal end surface 32t is protrusively located beyond the side surface 4s of the ground electrode 4. When the ground-electrode spark portion 32 is viewed in plane from the distal end surface 32t, a portion of the surface of the ground-electrode spark portion 32 is viewed as a peripheral exposed-region surface 32p which is exposed on the side surface 4s of the ground electrode 4 so as to surround the distal end surface 32t.
    • 接地电极火花部32由含有Pt作为主要成分的贵金属形成,并且通过厚度为0.5μm〜100μm的合金层与接地电极4的主金属部接合, 其中构成接地电极火花部分32的贵金属和构成接地电极4的主金属部分的金属彼此合金化。 接地电极火花部32构成为,面向火花放电间隙g的前端面32t的直径小于接合于接地电极4的底面32u的直径。 并且远端表面32t突出地位于接地电极4的侧表面4s之外。 当从前端面32t看平面处接地电极火花部32时,接地电极火花部32的一部分表面被看作暴露于侧面的周边暴露区域表面32p 接地电极4的表面4s,以围绕远端表面32t。