Spark plug and manufacturing method thereof
US11158997B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2017 |
| Grant date | Oct 26, 2021 |
| Priority date | — |
| Expiry date | Aug 8, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug for use with an engine block/cylinder head having a threaded bore and also for use with a spark plug wrench and an ignition wire. Also, an improved method for constructing a spark plug, the spark plug including a metal shell having a hex nut, a seat, a flange, a bore and threads. A ground electrode is associated with the shell and an insulator assembly occupies the bore and is gripped by the flange. The method includes the steps of forming the hex nut and the seat by carrying out operations on a blank, roiling the threads, fitting the insulator assembly into the bore, deforming the flange to capture the insulator, and forming the negative electrode by machining the blank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.