发明授权
US07291961B2 Spark plug having a specific structure of noble metal tip on ground electrode
有权
在接地电极上具有贵金属端头的特定结构的火花塞
- 专利标题: Spark plug having a specific structure of noble metal tip on ground electrode
- 专利标题(中): 在接地电极上具有贵金属端头的特定结构的火花塞
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申请号: US10948465申请日: 2004-09-24
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公开(公告)号: US07291961B2公开(公告)日: 2007-11-06
- 发明人: Akira Suzuki , Wataru Matsutani
- 申请人: Akira Suzuki , Wataru Matsutani
- 申请人地址: JP Aichi
- 专利权人: NGK Spark Plug Co., Ltd.
- 当前专利权人: NGK Spark Plug Co., Ltd.
- 当前专利权人地址: JP Aichi
- 代理机构: Sughrue Mion Pllc.
- 优先权: JPP.2003-373436 20030927
- 主分类号: H01T13/20
- IPC分类号: H01T13/20
摘要:
A method for producing a spark plug, the spark plug including: a center electrode; an insulator which holds the center electrode therein in a state where a tip end portion of the center electrode protrudes therefrom; a metal shell which holds the insulator therein; a ground electrode which is fixed to the metal shell, the ground electrode having an inner side face having a width that is smaller as it advances toward a tip end side, in a portion of the inner side face positioned between a pair of tapered faces; and a discharge portion which is bonded to the inner side face of the ground electrode by laser welding so as to attain a diameter of 0.8 mm or less and a height of 0.5 mm or more, a discharge gap being formed between the discharge portion and the tip end portion of said center electrode, the method including: forming the tapered faces before the discharge portion is laser-welded to the inner side face.
公开/授权文献
- US20050242695A9 Method-for producing a spark plug, and spark plug 公开/授权日:2005-11-03
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