发明名称 |
Spark plug resistant to accidental discharges |
摘要 |
A spark plug includes a cylindrical metallic shell having a shoulder portion, and a tubular insulator having a stepped portion which rests on the shoulder portion within the metallic shell. The insulator has a rear half made of aluminum oxide and a front half made of aluminum nitride, the rear half having a protrusion, while the front half having a housing, and tightly joining the protrusion within the housing. An overlapping portion of the protrusion and the housing is at least partly located in a plane which is perpendicular to a longitudinal axis of the center electrode, the plane passing through the shoulder portion of the metallic shell.
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申请公布号 |
US5477104(A) |
申请公布日期 |
1995.12.19 |
申请号 |
US19940338829 |
申请日期 |
1994.11.10 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
TANABE, HIROYUKI;MUSASA, MAMORU;SUGIMOTO, MAKOTO;KONISHI, MASAHIRO |
分类号 |
H01T13/20;H01T13/36;H01T13/38;(IPC1-7):H01T13/20 |
主分类号 |
H01T13/20 |
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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