Spark plug with specific electrode structure
US6232704A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Apr 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug for an internal combustion engine or a sensor element for an ignition or combustion process is provided in which at least one of the electrodes consists of two materials. The electrodes are designed such that the distance from a first area of one electrode to the other electrode is less than the distance from the one additional area of one electrode to the other electrode. The two areas consist of different materials, and at least one of the electrodes has a slight radius of curvature in the first area at the point at which the distance from the other electrode is minimal. Regardless of or in connection with this design, the shape of the surface of the electrode can be constant or continuous, at least at the transition between the two areas. One of the electrodes may have a material projection at a point that is opposite a point on the other electrode at which deposits can develop on the other electrode during operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.