Igniter plug structure having semicircular grooves
US4954743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1988 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Dec 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention provides an igniter plug, having a plurality of grooves within an outer surface of an annular ground electrode (2), the diameter of which is reduced to about 13 mm. Each groove (6) generally has a semi-circular shape in cross section to allow air flow along the grooves (6), with the number of the grooves (6) in the range from 4 to 16, and the width of each groove is to about 1.0 mm to 2.5 mm. The semi-circular cross section of the grooves (6) makes it possible to provide a large surface for the grooves without increasing the amount of machining, thus, enhancing cooling efficiency when the air flows along the grooves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.