JPS62299009A - Ignition coil of igniter 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 Field of the Invention The present invention relates to an ignition coil for an ignition device of an internal combustion engine according to the generic concept of claim 1.

PRIOR ART Such an ignition coil is known, for example, from German Patent Application No. P 34 33 065.8. In this ignition coil, the means for dissipating the heat of the core into the atmosphere is an outer aluminum foil, which is joined to another core foil and extends beyond this core foil to the vehicle body. It has a flange for fixing. As a result, heat is also released into the vehicle body.

However, the heat dissipation of conventionally known ignition coils is insufficient when the coil output increases, causing trouble in the internal combustion engine.

OBJECTS OF THE INVENTION The object of the invention is to eliminate the drawbacks of the prior art mentioned above.

will be resolved.

Advantages of the invention With the ignition coil for the ignition system of an internal combustion engine according to the invention, the problems described and explained in the known prior art are solved by technically simple means and sufficient heat dissipation is achieved, so that the internal combustion engine obstacles are avoided.

The technical idea underlying the invention is to significantly increase the surface area of the means for dissipating heat in as small a volume as possible, ie with a small space requirement.

Advantageous developments of the invention are specified in the dependent claims. Claim 21 proposes a material for the casing which advantageously eliminates heat and also indicates a method of using the primary winding without a winding frame. With the configuration according to claim 3, the magnetic flux within the ignition coil is not disturbed by the casing. With the arrangement according to claim 4, the heat exhaustion of the ignition coil is increased and, for example, an advantageous fixing of the ignition coil force to the vehicle body is achieved. Claim 5 indicates means for forming slits in the bottom of the casing and in the jacket. With the configuration according to claim 6, the surface area of the casing is expanded, thereby increasing the heat dissipation efficiency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention is shown in the drawings and is explained in detail in the description of the figures. The ignition coil for the ignition device of the internal combustion engine shown in FIGS. 1 and 2 has an aluminum casing 10.
The casing has a substantially annular tank shape. The casing 10 has a sleeve 11 of quadrilateral cross-section, a jacket 12 concentric with this sleeve, and a base 13 connecting the sleeve 1 and the jacket 12.

The sleeve 11 and the bottom 13 as well as the jacket 12 itself are separated by radial slits 14, 15.16, a web 17.18 having a U-shaped cross section extending through the slit 15.1.
6, and this web is removed at the end of the assembly of the ignition coil. Projecting integrally and radially from the jacket 12 are projections 20 with cooling fins 19 on the one hand and fixing flanges 21 on the other hand.

The secondary winding 22 is wound around a winding frame 23, and the primary winding +11124 is inserted into this winding frame.

The primary winding is provided in the sleeve 11, and the sleeve 1
1 and the parts of the bottom 13 adjacent to the primary winding 20 have an insulating layer 25 .

Two L-shaped core halves 27 made of thin sheet iron (magnetic conductive material) are closed with riveted legs.
A glyph-shaped core 26 is formed. The sleeve 11 positively receives one leg 28 of the core 26, and the sleeve 11
Parallel legs 29 located on the outside of 1 are provided on the projection 20 of the casing 10 and are fixed with rivets 30.

The parts of the secondary winding 22 and the primary winding 20 as well as the legs 28 that project beyond these windings are embedded with an insulating material 31, which is a cast synthetic resin.

Effects of the Invention According to the present invention, the problems of the prior art are overcome, sufficient heat dissipation is achieved, and the surface area of the means for dissipating heat is reduced in as small a volume as possible, i.e. with a small space requirement. Can be expanded significantly.

[Brief explanation of the drawing]

Each figure is shown in an enlarged view, and FIG. 1 is a mainly diagonal cross-section showing an ignition coil for an ignition device of an internal combustion engine having a closed iron core, taken along line I-I in FIG. FIG. 2 is a cross-sectional view along the line ■--■ of FIG. 1 with an iron core but without an ignition coil and casting material.

Claims (1)

[Claims] 1. It has a closed multi-legged core made of a magnetically conductive material, one of the legs coaxially surrounding the primary winding and the secondary winding, and further dissipates the heat of the core. An ignition coil for an ignition device of an internal combustion engine, the means having a thermal conductivity greater than that of the core, the means comprising a sleeve (11).
a casing (10) having a sleeve (10) which receives the leg (28) of the core (26) and which sleeve (
11) Both coils (22, 24) are provided on the
An insulating material (31) is provided in the remaining space of the casing (10).
An ignition coil for an ignition device of an internal combustion engine, characterized in that it is filled. 2. The primary winding is provided inside the secondary winding, and the casing (10) is made of aluminum and has a sleeve (11) and a jacket (12) arranged concentrically. It has the shape of an annular tank with a bottom (13) connecting the sleeve (12) and the sleeve (11);
11) and the part of the bottom (13) adjacent to the primary winding (24) has an insulating layer (25).
An ignition coil for an ignition device of an internal combustion engine as described in 2. 3. Sleeve (11) and bottom (13) and jacket (
12) Ignition coil for an ignition system of an internal combustion engine according to claim 2, wherein the ignition coil is separated by substantially radial slits (14). 4. The core is annular and forms two L-shaped core halves, and a radial projection (20) with a fixed flange (21) is integrated from the jacket (12) of the casing (10). The projection (20) has legs located outside the core (27), such as the sleeve (11).
3. An ignition coil for an ignition device for an internal combustion engine according to any one of claims 1 to 3, wherein the ignition coil is provided with legs (29) parallel to each other. 5. Bottom (13) of casing (10) and jacket (12)
) has a U-shaped cross-section slit (14) in the web (17
, 18), and the web is removed after the insulating material (31) (synthetic resin) has hardened. coil. 6. The ignition device for an internal combustion engine according to any one of claims 1 to 5, wherein a plurality of cooling fins (19) protrude from the jacket (12) of the casing (10). Ignition coil for.