Spark plug and method of producing the same
US10873176B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 2020 |
| Grant date | Dec 22, 2020 |
| Priority date | — |
| Expiry date | Mar 9, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug has a housing of a cylindrical shape, an insulator of a cylindrical shape, and a packing. The housing has a housing facing surface. The insulator has an insulator facing surface and is supported in the housing. The packing has an insulator side contact surface which is in contact with the insulator facing surface. The packing is arranged between the housing facing surface and the insulator facing surface to face both the housing facing surface and the insulator facing surface. The packing has proximal inner circumferential surfaces formed adjacent with the inner periphery side of the insulator side contact surface. Each of the proximal inner circumferential surfaces has a curved shape smoothly connected to the insulator side contact surface of the packing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.