Spark plug element having defined dimensional parameters for its insulator component
US7262547B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2004 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Feb 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug which includes an end at its combustion chamber end, and an end at its connecting end, as well as a housing and an insulator situated in the housing. The insulator has a longitudinal bore having a longitudinal axis, a center electrode situated in the longitudinal bore of the insulator, a first ground electrode which extends into the region of the longitudinal axis of the insulator, and a second ground electrode which is situated at a distance from the longitudinal axis of the insulator laterally next to the center electrode. The insulator has a front section, facing the first ground electrode, which has an end face. The insulator has an outside diameter d and an inside diameter c, d−c, that is, the difference between outside diameter d and inside diameter c, in the front section of the insulator being not greater than 1.9 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.