Invention Grant
- Patent Title: Spark plug
- Patent Title (中): 火花塞
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Application No.: US14582801Application Date: 2014-12-24
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Publication No.: US09548592B2Publication Date: 2017-01-17
- Inventor: Tadatoshi Fujino , Kenji Ban , Yuichi Yamada
- Applicant: NGK Spark Plug Co., LTD.
- Applicant Address: JP Nagoya
- Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee Address: JP Nagoya
- Agency: Leason Ellis LLP
- Priority: JP2013-265208 20131224
- Main IPC: H01T13/39
- IPC: H01T13/39 ; H01T13/16 ; H01T13/20

Abstract:
A sparkplug includes: an insulator with an axial hole extending along an axial line; a metal shell covering the insulator; and a shelf part inside the metal shell. The insulator includes a second column part formed in the front end side of a tapering part. When a volume surrounded by a first plane that passes through the front end of the shelf part of the metal shell and is orthogonal to the axial line, a curved surface extending from an outer circumference of the second column part, and an outer circumferential surface of the insulator is defined as A, and a volume surrounded by the first plane, the curved surface, a second plane that passes through the front end of the metal shell and is orthogonal to the axial line, and the axial hole of the insulator is defined as B, a relational expression 0.9≦A/B≦2.4 is satisfied.
Public/Granted literature
- US20150180215A1 SPARK PLUG Public/Granted day:2015-06-25
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