Structure of spark plug designed to provide higher durability and fabrication method thereof
US6891318B2 · kind B2 · utility
5Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2002 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | Aug 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved structure of a spark plug which provides higher durability of a joint of a noble metal chip to an electrode such as a center or a ground electrode. The joint is formed by laser welding. A fused portion made of materials of the noble metal chip and the electrode fused together by the laser welding is formed in the joint so that it may continue over at least half a circumference of a contact between the noble metal chip and the electrode without interfaces of welds, thereby enhancing the activity of the fused portion as a thermal stress absorber. A welding method is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.