Glow plug arranged for measuring the ionization current of an engine
US6646229B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2002 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Mar 7, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23Q7/001
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A glow plug (10) for diesel engines that includes a threaded metal tubular body (12) and a metal sheath (22) carried by the tubular body. The sheath (22) has an end portion (24) projecting from the tubular body (12) and is electrically insulated from the tubular body. The glow plug (10) includes first and second electrical terminals (30,46) and a heating resistor (34) electrically connected to the first terminal (30) and to the end portion (24) of the sheath (22). The first terminal (30) has the shape of a metal rod extending through the tubular body (12) and has an end inserted inside the sheath (22). The heating resistor (34) is also set inside the sheath (22). The second terminal (46) is electrically connected to the sheath (22) and can be disposed either coaxially around the first terminal (30) or coaxially within the first terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.