Coaxial twin spark plug
US7443088B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2004 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | Feb 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/467
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug having a pair of independent spark gaps includes a shell, inner and outer insulators, a cylindrical electrode assembly, a center wire assembly, and a pair of ground electrodes. The cylindrical electrode assembly is generally located between the two insulators and delivers a first high voltage ignition pulse to a first spark gap. The center wire assembly is located in an axial bore of the inner insulator and delivers a second high voltage ignition pulse to a second spark gap. The two insulators and two electrode assemblies are all coaxially aligned within the shell so that both insulators can be rotationally symmetrical. The first spark gap is radially oriented while the second spark gap is axially oriented, and the first and second spark gaps are located at different axial positions and can fire independently of one another. A method of assembling the spark plug is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.