发明授权
- 专利标题: Spark plug attachment structure and spark plug therefor
- 专利标题(中): 火花塞附件结构和火花塞
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申请号: US10119716申请日: 2002-04-11
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公开(公告)号: US06703770B2公开(公告)日: 2004-03-09
- 发明人: Akira Suzuki , Takahiro Suzuki , Kazumi Kawamura , Kazuya Iwata
- 申请人: Akira Suzuki , Takahiro Suzuki , Kazumi Kawamura , Kazuya Iwata
- 优先权: JP2001-113632 20010412
- 主分类号: H01T1320
- IPC分类号: H01T1320
摘要:
A spark plug has a central electrode, an insulator surrounding the central electrode and a metallic shell retaining therein the insulator and provided with no thread thereon. The spark plug is clearance fitted in a plug hole of a cylinder head, without being screwed into the plug hole, in such a manner that a front end portion of the metallic shell is accommodated in a front end section of the plug hole with a clearance therebetween provided with a sealant so as to transmit heat from the spark plug to the cylinder head. The clearance is preferably given by the following expression: 0.005≦D−d1≦0.05, where D is an inner diameter (mm) of the front end section and d1 is an outer diameter (mm) of the front end portion. By this, the spark plug can be easily attached to the cylinder head and attain improved heat resistance.
公开/授权文献
- US20020149308A1 Spark plug attachment structure and spark plug therefor 公开/授权日:2002-10-17
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