Spark plug
US10027093B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2016 |
| Grant date | Jul 17, 2018 |
| Priority date | — |
| Expiry date | Mar 28, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug includes an insulator having an axial hole formed in a direction of an axis, a center electrode held in one end side of the axial hole, a metal terminal held in the other end side of the axial hole, an electrical connection part arranged to establish electrical connection between the center electrode and the metal terminal within the axial hole, and a metal shell disposed around an outer circumference of the insulator and having a thread portion formed on at least a part of an outer circumferential surface thereof. The electrical connection part has a resistor, and a conductive seal layer provided between the resistor and the center electrode to seal and fix the insulator and the center electrode together. In a half or more of a region in which the seal layer is provided in the direction of the axis, the spark plug satisfies predetermined conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.