发明授权
- 专利标题: Compact spark plug with high gas tightness
- 专利标题(中): 紧凑型火花塞具有高气密性
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申请号: US11188772申请日: 2005-07-26
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公开(公告)号: US07400081B2公开(公告)日: 2008-07-15
- 发明人: Hiroyuki Ishiguro
- 申请人: Hiroyuki Ishiguro
- 申请人地址: JP
- 专利权人: Denso Corporation
- 当前专利权人: Denso Corporation
- 当前专利权人地址: JP
- 代理机构: Nixon & Vanderhye PC
- 优先权: JP2004-218793 20040727; JP2005-150996 20050524
- 主分类号: H01T13/20
- IPC分类号: H01T13/20
摘要:
A spark plug has a compact structure where a threaded portion of a metal shell has a size of M10 or M12 and the width between any two opposite side surfaces of a polygonal prism-shaped portion of the metal shell is no greater than 14 mm. In the spark plug, a thickness A of the polygonal prism-shaped portion of the metal shell, a thickness B of a crimped portion of the metal shell, and a thickness C of a buckled portion of the metal shell are subject to a dimensional relationship of A>B>C. Through specifying such a relationship, the crimped portion of the metal shell exerts a large constricting force on sealing members provided in a gap between the inner surface of the polygonal prism-shaped portion of the metal shell and the outer surface of an insulator, thereby securing high gas tightness of the spark plug.
公开/授权文献
- US20060022566A1 Compact spark plug with high gas tightness 公开/授权日:2006-02-02