JPS59105308A - Ignition coil for ignitor of internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION PRIOR ART The present invention relates to an ignition coil for an ignition device between an inner and a twister, having a core made of sheet metal soft iron.

Ignition coils of this type are known (from DE 27 45 990 A1) and are used when starting cold, i.e. at low temperatures and at low supply voltages. However, it may happen at any time that the amount of energy delivered is too low to produce an effective ignition spark.

Advantages of the Invention By using the configuration having the features set forth in claim 1, it is possible to rise to a proper winning operation when starting in a cold state. An ignition coil having a high magnetic flux density and thus providing sufficient energy for an effective ignition spark under this operating condition is obtained.

Advantageous configurations for realizing the invention are shown in the embodiment section.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, an embodiment of the invention will be described in more detail below, a core is designated at 1 for an ignition system, also not shown, of an internal combustion engine, not shown. This iron core 1
has a first transverse yoke 2 which is the starting point of two longitudinal legs 3.4 of equal length and extending in parallel. The transverse yoke 2 and the longitudinal yoke 3.4 are constructed from a thin sheet of soft iron 5. The longitudinal yoke 3 carries a primary winding 6 and a secondary winding 7, the windings 6, 7 being shown here only symbolically.

The vertical yokes 3 and 4 are cut diagonally at the free end surface 9,
At this time, this obliquely cut portion is in contact with the obliquely cut end surface of the second horizontal yoke 8. The thin plate 9 constituting the second ram yoke 8 is indicated by a thick solid line, so that this thin plate 9 has a curiosities compared to the other core parts 2, 3.4 of conventional transformer plates. It has been shown that it consists of a magnetically conductive additive at a temperature between 0°C and 100°C, preferably 50°C, and that this fsI addition (manganese-zinc-ferrite is particularly suitable for the material) ing.

Due to the fact that the ignition coil initially has a high magnetic flux density when scooting in a cold state, this magnetic flux density decreases after positive operation. This is because, at low supply voltages, a sufficient amount of energy/V can be stored for an effective ignition spark.

In the case of the core 1 according to FIG. 1, a part of the magnetic circuit is formed of additional material, or in the embodiment of FIG. has been done. The partial cross-section formed by the sheet 11 of additional material has the shape of a notched circle and complements the cross-section formed by the sheet 12 of the current-carrying transformer plate, resulting in an overall circular cross-section. The iron core 10 is integrally covered with an insulating coating 13.

[Brief explanation of the drawing]

FIG. 1 shows a perspective view of a U--core for an ignition coil according to the invention, and FIG. 2 a perspective view of a rod core according to the invention.

Claims (1)

[Claims] 1. An ignition coil for an ignition bag of an internal combustion engine having a core made of a thin sheet of soft iron, in which the core (1, 10) partially has a Gyuri temperature of 0°C and 100°C. An ignition coil for an ignition system of an internal combustion engine, characterized in that it consists of a magnetically conductive additional material located therebetween. 2. The ignition coil for an ignition device for an internal combustion engine according to claim 1, wherein the additional tung metal is manganese-zinc ferrite.