发明名称 |
Multi-polarity type spark plug for use in an internal combustion engine |
摘要 |
In a multi-polarity type spark plug for an internal combustion engine, a tubular insulator is supported within a cylindrical metallic shell through which a spark plug is to be attached to an internal combustion engine. A center electrode is placed within the insulator, a front end of the center electrode being directed toward a combustion chamber of the internal combustion engine from a front end of the metallic shell so as to extend beyond a front end of the insulator. First and second ground electrodes are each connected to the front end of the metallic shell, the first ground electrode forming a first vertical spark gap with a front end surface of the center electrode which directly opposes an elevational side of the center electrode, and the second ground electrode forming a second horizontal spark gap with an elevational side of the center electrode. An angle theta a is limited as 60 DEG </= theta a </=150 DEG in which the angle theta a is taken when the first ground electrode forms against the second ground electrode with the center electrode as an axial center.
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申请公布号 |
US5680002(A) |
申请公布日期 |
1997.10.21 |
申请号 |
US19960592693 |
申请日期 |
1996.01.26 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
KUNITOMO, IWAO;MATSUBARA, YOSHIHIRO;AMANO, KOZO |
分类号 |
H01T13/32;H01T13/46;(IPC1-7):H01T13/20 |
主分类号 |
H01T13/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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