High thread ground shield
US7977857B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 27, 2009 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Aug 11, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug for an internal combustion engine comprises an elongated center electrode having a center electrode tip at one end and a terminal proximate the other end, an insulator substantially surrounding the center electrode, and a ground shield. The insulator has a substantially cylindrical body with at least a first insulator section and a second insulator section. The first and second insulator sections having first and second diameters respectively and are separated by an insulator shoulder. The ground shield has an elongated base section substantially surrounding the first insulator section, a frustoconical flange protruding from one end of the base section to engage the insulator shoulder, and a ground electrode extending from the other end of the base section to define an axial spark gap with respect to the center electrode tip. The base section and the ground electrode are formed as separate components and secured together to form the ground shield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.