Ignition coil
US5285761A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1993 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Jan 15, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ignition coil having annular primary and secondary coils, the primary coil wound around a central core member and including a permanent magnet made of a magnetic material that is less than fully dense, and is interposed between one end of the central core member and one end of a C-shaped iron core surrounding the primary and secondary coil assembly and assuring the elimination of any air gap between the C-shaped iron core and the central core member. Alternatively, the permanent magnet may be replaced with an electrically non-conductive shim of substantially equal dimension such that the energy output is substantially reduced and the charge/discharge interval substantially increased to thereby allow use of the same basic modularly constructed coil assembly for totally different ignition strategies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.