JPS58153314A - Core for closed magnetic path type ignition coil - Google Patents

Abstract

PURPOSE:To obtain a core which is excellent in mass productivity by bonding both halves by utilizing the end faces of a core coil side, thereby accurately butting the end faces and readily and rigidly bonding the both halves. CONSTITUTION:Both halves 21, 22 are opposed at the end faces of core coil units 3 and at the end faces of a pair of sides 41, 42, respectively mounted on upper and lower dies of a pressing machine, projections 6 are respectively engaged with grooves 8 to press-fit the engaging strip 7 into the engaging groove 9, thereby bonding them. In this case, the swelled part 12 and the engaging hole 11 as the coupling parts of the iron plates 101, 102 of the halves 21, 22 are disposed in the vicinity of the strip 7 and groove 9, and the plates 101, 102 are not accordingly isolated at the layers at the part 12 but the press-fitting work can be effectively performed. Since the strip 7 and the groove 9 respectively have superior arc convex and concave surfaces and can be forcibly engaged between the convex strip 7 and the concave groove 9, the halves 21, 22 can be strongly bonded. In this manner, a core which is excellent in mass productivity can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iron core for a closed path type ignition coil used in an ignition system for an internal combustion engine.

This type of core is equipped with a pair of E-shaped half-holes having a coil core and a pair of side pieces located on both sides of the core, and the end faces of both coil cores are connected to each other with a predetermined gap between them. It is known that the two halves are joined by facing each other and abutting the end surfaces of a pair of side pieces. The ignition coil is constructed by wrapping the primary and secondary coils inside and outside the core of both coils, but when joining the two halves, the side end faces must be aligned accurately. If you don't match it,
This causes deviation in the gap size between the end faces of the coil winding core, making it impossible to obtain an effective change in magnetic flux.

Furthermore, if a gap is created between the side end faces, there is a risk that the magnetic resistance of the entire magnetic path will be adversely affected.

In view of the above, the present invention joins both halves by using the end faces of the side parts, thereby accurately butting the end faces with each other, and joining the two halves easily and firmly, thereby achieving excellent mass productivity. , an object of the present invention is to provide the above-mentioned iron core.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a laminated iron core, which is formed into a frame shape by joining a pair of E-shaped half-holes 2 and 12 formed by laminating and bonding a large number of electromagnetic soft iron plates. It is formed. Each half zt-zt has the same shape, consisting of a coil winding core 3, a pair of side parts 41.4 located on both sides thereof, and a coil winding core 3 and a pair of side parts 4. , 42. The end face of the coil winding core 3 is formed in a planar zigzag shape. Also, one side 4. The end portion of the protrusion 6 is formed in a substantially V-shape in plan, and an engagement protrusion 7 having a convex surface in a planar shape is protruded from the tip thereof. The end of the other side 42 has a plane approximately V
A groove 8 is formed in the shape of a letter, and an engagement groove 9 having a concave surface having a substantially arcuate shape is formed at the bottom thereof.

Each half 4. , 42 are connected to each other by the following method.

That is, one iron plate 10. The middle part and both side parts 4 of the connecting part 5. , 42, and a rectangular engagement hole 11 is formed near the engagement groove 9, respectively, and a pair of parallel engagement holes 11 are formed in the other iron plate 10□ at a position corresponding to each engagement hole 11. An iron plate 10 with cuts 12 and engagement holes 11. A large number of iron plates 102 are placed at the lowest position and have cuts 12 thereon.
Laminate. After that, each cut 12 of the top iron plate 10□
The gap between the upper and lower bulges 13 is pressed impactfully with a punch to bulge out in a V-shape, and the bulges 13 located at the top and bottom are connected with each other. The respective bulging portions 13 are engaged with the respective engagement holes 11 of the iron plates 10 of both types. .

102 is combined.

The two halves 21 and 22 are installed in the upper and lower molds of the press, respectively, with the end faces of the coil winding core 3 and the end faces of the pair of side parts 4r-4t facing each other, and each of the protrusions 6 are fitted into the valley grooves 8 and each engagement protrusion T is press-fitted into each engagement groove 9, thereby joining. As a result, a gap G of a predetermined width is formed between the end surfaces of both coil core portions 3. ,
In this case both halves 2. ．． 2. Since the bulging portion 13 and the engagement hole 11, which are the connecting portions between the iron plates 101 and 102, are located near each engagement protrusion 7 and each engagement groove 9, the iron plate 10. ．． 102 will not cause delamination (and the engineering work will be carried out reliably). Also, each engagement protrusion 1 and each engagement groove 9 have a highly arcuate convex surface and a highly arcuate concave surface, respectively. Since the forced concave-convex fitting is performed between the two halves 2. and 2.0, the joint strength of both halves 2. and 2.0 is high.

The primary coil 14 is directly wound around a synthetic resin bobbin 15, and a synthetic resin bobbin 16 is attached to the outer periphery of the primary coil 14.
8 is wrapped in multiple layers. 1 wrapped in double layers like this
The primary and secondary coils 14.18 are connected to both halves 21. 22, the primary coil 14 is attached to both coil winding cores 3 via the bobbin 15, thereby making it possible to simultaneously form the iron core 1 and wind each coil 14, 18 around it.

As described above, according to the present invention, a pair of E-shaped half-holes each having a coil winding core and a pair of side parts located on both sides thereof are provided, and the end faces of both coil winding cores are connected between them. In a closed i-way type ignition coil iron core in which both halves are joined by facing each other with a predetermined gap and abutting the end faces of a pair of side parts, an engaging protrusion is provided on the end face of one of the side parts that are abutted against each other. In addition, engagement grooves were provided on the end faces of the other side, and each engagement protrusion was press-fitted into each engagement groove to join the two halves, so the end faces of both sides could be accurately abutted against each other to secure the coil. It is possible to prevent the gap size between the end faces of the winding core portion from being out of order, and also to prevent the generation of a gap between the ends of both measuring portions. In addition, the work of joining both halves can be performed extremely easily and firmly, thereby making it possible to provide an iron core with excellent mass productivity.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a perspective view of the coil wound, Fig. 2 is a plan view of the coil cut, and Fig. 3 is a partially closed part before joining. Floor plan, 4th
The figure is a sectional view taken along the line IV--IV in FIG. 2. 1... iron core, 2. ．． 22...Half rest, 3...Coil winding core, 4*=4t...Side part, 7...Engagement protrusion, 9
...Engagement Fig. 3 Fig. 4 Fig. 1 Fig. 2

Claims (1)

[Claims] A pair of E-shaped half-holes having a coil winding core and a pair of side parts located on both sides thereof, the end faces of both coil winding cores facing each other with a predetermined gap between them, and In the iron core for a closed magnetic circuit type ignition coil in which the two bodies are joined by abutting the end faces of the pair of side parts, an engaging protrusion is provided on the end face of one of the side parts that are abutted against each other, and an engaging protrusion is provided on the end face of the one of the side parts that are abutted against each other, and An iron core for a closed magnetic circuit type ignition coil, in which both halves are joined by providing retaining grooves on the end faces and press-fitting each engaging protrusion into six engaging grooves.