Spark plug
US12308620B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2023 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Dec 18, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To provide a spark plug that can ensure the strength of a melt portion, the spark plug includes: a center electrode; a metal shell in which the center electrode is insulated and held, the metal shell including a cylindrical portion having an outer circumference provided with an external thread, the metal shell further including a hole penetrating the cylindrical portion in a radial direction; and a ground electrode protruding from the metal shell toward the center electrode and connected, in the hole, to the cylindrical portion via a melt portion. In a cross section including a center line of the hole and the melt portion, the melt portion has a part in contact with the cylindrical portion, and the part is present on an outer side in the radial direction relative to the ground electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.