发明名称 |
Spark plug for internal combustion engine and method for producing the spark plug |
摘要 |
A spark plug including: a ground electrode including a thick portion provided on a base end side, a thin portion provided on a distal end side, and a stepped portion provided on an inner peripheral surface between the thick portion and the thin portion; a noble metal tip partially embedded in an inner peripheral surface of the thin portion; and a bulge portion provided on the inner peripheral surface of the thin portion between the stepped portion and the noble metal tip. When viewed from a side surface of the ground electrode, a relationship [a protruding height of the noble metal tip from the inner peripheral surface of the thin portion] ‰¥ [a protruding height of the bulge portion from the inner peripheral surface of the thin portion]. |
申请公布号 |
EP2063506(B1) |
申请公布日期 |
2014.02.12 |
申请号 |
EP20080020246 |
申请日期 |
2008.11.20 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
KAMEDA, HIROYUKI;NAKAYAMA, KATSUTOSHI;NAGASAWA, SATOSHI |
分类号 |
H01T21/02;H01T13/32 |
主分类号 |
H01T21/02 |
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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