Creeping discharge type igniter plug
US4951173A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1988 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Dec 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/52
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention provides a creeping discharge type igniter plug, having a center electrode concentrically located within the center bore of the insulator. Near the lower portion of the center electrode is an annular space (6), formed between an outer surface of the center electrode and an inner surface of the semi-conductor ring (4). At the annular space (6), a lateral distance between the outer surface of the center electrode (2) and the inner surface of the semi-conductor ring (4), progressively decreases toward a lower end of the semi-conductor ring (4) thus, making it possible to maintain the least electrical resistance at a creeping discharge path defined from a lower end surface (3a) of the ground electrode (3) to a lower end surface (2a) of the center electrode (2) via a lower end surface (4b) of the semi-conductor ring (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.