Spark plug for internal combustion engine

专利名称：Spark plug for internal combustion engine发明人：Gotou, Tsunetoshi,Abe, Nobuo申请号：EP01116096.7申请日：19980218公开号：EP1133037A3公开日：20021030

专利附图：

摘要：In a spark plug for an internal combustion engine, a noble metal chip (1) such asan iridium alloy chip is bonded on the tip of a center electrode (2) made of a materialsuch as nickel by laser beam welding. The noble metal chip (1) contains another noblemetal such as rhodium having a melting point lower than that of the noble metal chip. By

laser welding, a molten bond (11) containing the noble metal melted thereinto from thenoble metal chip (1) is formed at the junction of the noble metal chip (1) and the centerelectrode (2). Alternatively, the noble metal to be melted into the molten bond (11) maybe supplied by a separate noble metal plate. The molten bond thus made has a highbonding strength and a small thermal stress, and thereby durability of the spark plug isimproved.

申请人：Denso Corporation

地址：1-1, Showa-cho Kariya-city, Aichi-pref., 448-8661 JP

国籍：JP

代理机构：Leson, Thomas Johannes Alois, Dipl.-Ing.

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