Glow plug with constant-structure cobalt-iron PTC resistor
US5319180A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Jun 26, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23Q7/001
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A sheathed-element glow plug for disposition in the combustion chamber of air-compressing internal combustion engines is proposed which in a known manner contains a resistor element (17) in its sheathed-element (13), where this resistor element (17) is composed of two serially connected resistor spirals (20, 21). While the resistor spiral (20) on the combustion chamber side is a heater spiral with a resistance behavior which is essentially the same at all operating temperatures, the wirespiral shaped resistance spiral (21) on the side remote from the combustion chamber which acts as a regulating element, has a high temperature resistance coefficient. This resistance spiral (21) consists of a cobalt-iron alloy, which is not subject to material breakdown under the temperature stresses occurring in an internal combustion engine; the cobalt-iron alloy has been selected in such a way that it maintains a cubic face-centered material structure during all operational stages of the sheathed-element glow plug (10) from 0.degree.-1200.degree. C.; the iron content of this cobalt-iron alloy lies between 6 and 18 weight percent, preferably at 2 to 14 weight percent. The resistor element (17) for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.