Spark plug having a metal fitting portion for holding an insulator at a portion opposite a tip end
US8237343B2 · kind B2 · utility
3Cited by
6References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2006 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Sep 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is a spark plug that includes a center electrode extending in an axial direction, a cylindrical insulator that holds the center electrode, and a cylindrical main metal fitting, which has a ground electrode at a tip portion thereof. The cylindrical main metal fitting includes a tool engagement portion for mounting the spark plug to an engine and a metal fitting-side fitting portion provided at a rear side of the main metal fitting opposite from the tip portion. The metal fitting-side fitting portion holds the insulator in a tightly fitted state in a radial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.