Self-regulating electric glow plug
US4556781A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1984 |
| Grant date | Dec 3, 1985 |
| Priority date | — |
| Expiry date | Dec 18, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23Q7/001
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A self-regulating electric glow plug for an air-compressing internal combustion engine includes an elongated tube having a first end arranged within a plug housing and a second closed end defining a tubular component adapted to extend into a combustion chamber of the engine to produce heat when heated to a glowing condition. A coiled electric resistance heating element is disposed entirely within the tubular component and is embedded in a mass of thermally conductive electrical filling the tube. The resistance element includes two oppositely wound resistance wire coils connected in an end-to-end serially connected array with the first coil being located closest to the glow plug housing and the second coil being located closest to the closed tube end. The first coil has a higher positive temperature coefficient of resistance than the second coil. The second coil defines a heating element for the combustion chamber of the engine and has the capability of heating the entire tubular component in which the coils are located to incandescence within three to five seconds after being energized. The first coil is thus affected not only by internal heat produced by the current flow through a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.