Sparkplug for an internal combustion engine
US7915795B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2006 |
| Grant date | Mar 29, 2011 |
| Priority date | — |
| Expiry date | Jun 1, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug for an internal combustion engine of a motor vehicle, having a substantially cylindrical general form, includes an essentially capacitive lower part and an essentially inductive upper part. The lower part includes two coaxial electrodes, including a central electrode with an axis and a shell electrode that surrounds the central electrode, and an insulator inserted between the central electrode and the shell electrode. The upper part includes a central mandrel surrounded by a coil, a bottom end part of which overlaps a top end part of the central electrode in a radial direction, an external casing, and an insulator inserted radially between the casing and the coil. The top end part of the central electrode has a coating of material which is more electrically conductive than the material of the central electrode and has no ferromagnetic properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.