JPS59167006A - Ignition coil for ignition device 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 has a core consisting of a sheet of soft iron with grain orientation, on which a primary winding and a secondary winding are inserted, and which are inserted into the air gap of the core. The present invention relates to an ignition coil for an ignition system of an internal combustion engine having a permanent magnet whose magnetic flux is oriented in the opposite direction to the magnetic flux generated from the primary winding in the core.

Such ignition coils are capable of storing relatively high amounts of energy in interchangeable dimensions (according to German Utility Model Registration No. 79 24 989); ignition fills of this type are known; The coil has a coated core and is therefore relatively large in size. In addition, the core consists of a thin plate that is complex in shape and therefore expensive to manufacture.

Advantages of the Invention In the ignition coil according to the present invention, claim 1
The above-mentioned difficulties are avoided by using the configuration shown in section 2.

The Embodiment section shows an advantageous configuration for realizing an ignition coil according to the invention. 1. DESCRIPTION OF THE EMBODIMENTS An embodiment of the invention will be explained in detail below with the aid of the figures. The ignition coil shown is for use in an ignition system (also not shown) of an internal combustion engine (not shown).To this ignition coil belongs a core 1, which is made of a grain-oriented sheet of soft iron 2. It has a primary winding 3 and a secondary winding 4, the windings 3.1-j being shown only symbolically. A permanent magnet 5 is inserted into the air gap of the core 1, the magnetic flux of which is directed in the opposite direction to the magnetic flux generated in the core 1 by the primary winding 3. Permanent magnet 5 is +1- in advantageous case
j Consists of rare earth alloy. The air gap accommodating the permanent magnet 5 is in a transverse yoke 6 which is a component of the core 1 forming a rectangle. The transverse yoke 6 is the starting point for two equal-length parallel longitudinal legs 7.8, which are connected to the transverse yoke 6 without any gaps and which, depending on the grain orientation, A transverse leg 9 , which has a higher magnetic permeability than the yoke 6 , connects the longitudinal leg 7 to the longitudinal leg 8 on the side facing the transverse yoke 6 .

. The lateral leg 9 is a protrusion of the longitudinal leg 7 bent at a right angle without a gap, and the longitudinal leg 8 forms an air gap between the surface of the lateral leg Ω facing the lateral yoke 6. 11 Longitudinal legs 7.8 for grain orientation without abutting
has a higher magnetic permeability than the transverse yoke 6 and the transverse leg 9, since the transverse yoke 6 and the transverse leg 9 have a larger cross-sectional area to compensate for the difference in magnetic permeability. In this case, the relatively large cross-sectional area of the transverse yoke 6 is used for guiding the magnetic flux of the permanent magnet 5, which likewise has a relatively wide exit surface for the magnetic field lines and therefore does not carry the magnetic flux during energy storage. Very high density.

In order to choose approximately the same cross-sectional area for the transverse legs 9 as for the individual longitudinal legs 7.8, the embodiment according to FIG. 2 is suitable 9, in which case the longitudinal legs 7.8. 8 is cut obliquely at the end face, to which a lateral leg 10, also cut obliquely at the end face, is joined, which lateral leg 10Fi has an individual longitudinal leg 7.8 due to its grain orientation. 1° with the same magnetic permeability as

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an ignition coil according to the present invention, and FIG. 2 is a perspective view of an embodiment modified from the ignition coil according to FIG.・Primary winding,
4...Secondary winding, 5...Permanent magnet, 6...Horizontal yoke, 7゜8...Longitudinal leg, 9', 10...Horizontal leg procedure amendment (method) 1 71f Ii,') Indication Patent Application No. 201154 of 1981 2, Title of Invention Ignition Coil for Ignition System of Internal Combustion Engine 3, Person Making Amendment 4, Sub-Agent 6, Subject of Amendment However, engraving of the drawings ( (No change in content)

Claims (1)

[Claims] 1. It has a core made of a thin sheet of soft iron with grain orientation, on which are a primary winding and a secondary winding, and a permanent magnet inserted into the air gap of the core. In an ignition coil for an ignition system of an internal combustion engine, the core (1) of rectangular shape has a transverse yoke, and the magnetic flux of the permanent magnet is oriented in the opposite direction to the magnetic flux generated from the primary winding in the core. (6)
as a constituent part, the transverse yoke having an air gap for the storage of a permanent magnet (5) and being the starting point for two lengths of the same parallel longitudinal legs (7, 8). , the longitudinal leg continues to the transverse yoke without a gap,
have a higher magnetic permeability than the transverse yoke (6) due to the grain orientation, with the transverse yoke (6) having a larger cross-section than the individual longitudinal legs (7, 8) due to the lower magnetic permeability; An ignition coil for an ignition system of an internal combustion engine, characterized by: 2. The longitudinal legs (7, 8) have obliquely cut end faces, to which the similarly obliquely cut end faces of the transverse legs (10) are joined, and the transverse legs are individually Ignition coil for an ignition system of an internal combustion engine according to claim 1, having the same magnetic permeability and the same cross-sectional area as the longitudinal legs (7, 8) of the ignition coil.