Spark plug
US10707653B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 2019 |
| Grant date | Jul 7, 2020 |
| Priority date | — |
| Expiry date | Oct 8, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug, including a metallic shell, an insulator, a center electrode, and a ground electrode. The insulator includes a first outer surface at least partly along an exposed portion and a second outer surface at least partly along an unexposed portion. The first outer surface extends between the exposed-unexposed interface to a tip merge portion adjacent a distal end of the insulator. The first outer surface and the second outer surface meet at a nose surface transition. At the nose surface transition, the first outer surface is disposed at a first angle with respect to a central axis of the spark plug, and the second outer surface is disposed at a second angle with respect to the central axis of the spark plug. The first angle is larger than the second angle, and the nose surface transition is located within the unexposed portion or at the exposed-unexposed interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.