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US 4,048,972 AGranted
Ignition coil for internal combustion engines
AssigneeRobert Bosch GmbH
InventorPaul Worz
Life of this patent
Estimating the term…
Abstract
To provide a sharply rising flank of the ignition pulse, an insert of ferromagnetic material is placed between the primary and secondary coils of the primary and secondary windings of the ignition coil, forming a magnetic shunt to the core, and modifying the wave form of the output pulse from the ignition coil upon sudden interruption of current flow therethrough.
Claims11
Ignition coil for an internal combustion engine providing ignition pulses with a sharply rising flank having
- an iron core (1) of approximately square cross section, a primary winding (2) and a secondary winding (3);
- one of the windings (2) being a square coil of approximately square cross section and surrounding the iron core (1), the other winding (3) being a cylindrical coil of essentially circular cross section and surrounding the first winding (2) so that a sector-shaped space (10) will be included between the outer circumference of the first, square cross section winding and the second, circular cross section winding;
- and an insert of magnetic material (8a, 8b, 8c, 8d) located within said essentially sector-shaped space (10), between the primary (2) and the secondary (3) windings and essentially filling the space (10) between the windings, said magnetic insert forming a magnetic shunt with respect to the core to modify the wave form of pulses induced in the secondary winding (3) upon interruption of current flow through the primary winding (2) and providing pulses having a sharply rising flank.
Dependencies are inferred from the claim text.