Spark plug having specified spark gap dimensional relationships
US6215234A · kind A · utility
12Cited by
8References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1998 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Dec 9, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug defines a spark gap G in a range of 0.2 mm.ltoreq.G<0.4 mm, between a noble metal chip disposed on a central electrode and an earth electrode. The noble metal chip has a groove portion facing the earth electrode so that a space, which is larger than a sphere having a diameter equal to or larger than 0.4 mm, is provided in the spark gap G. As a result, a flame core having a diameter equal to or larger than 0.4 mm can be held in the space not to be quenched, resulting in high ignition property of the spark plug.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.