Spark plug
US9478946B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2015 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Mar 19, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug is disclosed and includes a metal tube which interiorly defines an axis and is externally-threaded for engagement with an engine block. An insulating has a portion which is disposed inside the tube and extends therebeyond. A positive electrode extends through the insulator and projects beyond the extending portion of the insulator. An annular ground electrode is coupled to the tube. The electrodes are configured such that a spark gap defined therebetween has an elongate channel which opens axially and away from the insulator and is substantially unobstructed in the axial direction. The ground defines a void having a central portion occupied by the positive electrode in use, an annular channel surrounding the central portion, and a plurality of lobes, each being positioned with respect to the central portion in a manner analogous to the placement of the planet gears with respect to the sun gear in a planetary gear arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.