Spark plug shell and method of manufacture
US11489316B2 · kind B2 · utility
0Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2020 |
| Grant date | Nov 1, 2022 |
| Priority date | — |
| Expiry date | Apr 9, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A metal shell for a spark plug is made from a steel material that has increased carbon content and, in some embodiments, boron as well. The steel material is well-suited for extrusion because of its ductility, while maintaining requisite strength. The spark plug shell may have a reduced outer diameter (ODHL) at a crimped hot lock region, such as the case when the shell is used in smaller diameter spark plugs, such as M8 and M10 plugs. According to a non-limiting example, the spark plug shell steel material comprises 0.20-0.55 wt % carbon, inclusive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.