Glow plug with ceramic heating element having electrode attached thereto
US6204481A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/027
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ceramic heater includes a cylindrical member; a ceramic heating member, which is disposed within the cylindrical member such that an end portion thereof is projected from an end of the cylindrical member; and a metallic shell, which surrounds the cylindrical member. The ceramic heating member includes a ceramic body and a U-shaped conductive ceramic element, which is embedded in an end portion of the ceramic body. A direction-changing portion of the conductive ceramic element generates heat through electrical resistance when electricity is supplied to the conductive ceramic element through electrodes connected to the end portions of the conductive ceramic element. The electrodes are disposed such that the distance L between the ends of the electrodes and the end of the metallic shell satisfies the expression L.ltoreq.1 mm, where the distance L is considered negative when the ends of the electrodes are located within the metallic shell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.