Spark plug for internal combustion engine
US10431960B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2017 |
| Grant date | Oct 1, 2019 |
| Priority date | — |
| Expiry date | Mar 24, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug for an internal combustion engine includes a cylindrical housing, a cylindrical insulator, a center electrode, and a ground electrode. The ground electrode includes an upright part and an inclined part. The upright part is a portion vertically provided on a tip end part of the housing to a tip end side. The inclined part is a portion that is bent from the tip of the upright part toward the center electrode side, and is extended toward an oblique tip end side. The inclined part has a ground end face, an opposed face, and a corner curved face. The corner curved face is a face that smoothly connects the ground end face and the opposed face. The corner curved face has a curved shape. The curvature radius R of the corner curved face satisfies 0.3 mm≤R≤0.7 mm. The inclination angle θ of the inclined part with respect to a plug axial direction (Z) satisfies 30°≤θ≤60°.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.