Long life spark plug having consumable discharge member
US5406166A · kind A · utility
10Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1992 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Sep 28, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is disclosed a spark plug which can maintain a low spark voltage for a long period of time even if a noble metal tip is used in a small amount. A discharge gap is formed between a central electrode and an earth electrode. The noble metal tip is formed on that end face of the central electrode facing the earth electrode. A cross-shaped groove is formed in that end face of the noble metal tip joined to the central electrode. The cross-shaped groove is exposed when the noble metal tip is consumed by a discharge developing in the discharge gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.