JPH1074657A - Method of winding spark coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the firm bank winding subject to no-winding deformation at all by feeding coil strand constantly with a specific feeding rate and tension from a nozzle without being affected by the reciprocation of the nozzle feeding the coil strand at all. SOLUTION: Within the title winding method of spark coil wherein while turning and shifting a coil bobbin 8 in axial direction, a nozzle 30 feeding secondary side coil strand 29 is reciprocated in a specific width so as to successively wind up the coil strand 29 while obliquely overlapping one by one layer making a specific angle with the coil bobbin 8, the nozzle 30 is to be recoprocated so as to be in parallel with the specific angle of the bank winding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding a secondary coil in an ignition coil device for an engine.

[0002]

2. Description of the Related Art Generally, in an ignition coil device for an engine, a coil wire is obliquely overlapped at a predetermined angle with respect to a coil bobbin so as to be able to set a low withstand voltage between layers of a secondary coil. Bank winding, which is sequentially wound in the axial direction, is adopted (Japanese Patent Laid-Open No. 60-1078).
No. 13).

Conventionally, as a method of winding an ignition coil by bank winding, as shown in FIG.
The nozzle 30 for supplying the coil element wire 29 is reciprocated in the axial direction with a predetermined width w ′ according to the length l of the bank while rotating and moving the coil bobbin 8 in the axial direction. The coil wires 29 are sequentially wound in the axial direction one by one while being superposed diagonally at a predetermined bank angle θ.

In such a conventional method of winding an ignition coil by bank winding, since the direction of reciprocating movement of the nozzle 30 is not parallel to the bank, there is a gap between the A part and the B part where the nozzle 30 moves. As a result, the supply speed of the coil wire 29 fluctuates, and the tension of the supplied coil wire 29 fluctuates.

[0005]

The problem to be solved is that in the conventional method of winding an ignition coil by bank winding, the direction of reciprocating movement of a nozzle for supplying coil wire is not parallel to the bank angle. Therefore, the supply speed and tension of the coil wire fluctuate during the movement of the nozzle, and as a result, the winding wound obliquely and overlappingly collapses, and the dielectric strength cannot be maintained at a constant level. It is.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a nozzle for supplying a secondary coil wire is reciprocated with a predetermined width while rotating a coil bobbin in the axial direction and moving the coil bobbin in the axial direction. On the other hand, there is a method of winding an ignition coil by bank winding in which coil wires are sequentially wound in the axial direction one layer at a time while being superposed obliquely at a predetermined angle, without being affected by reciprocating movement of the nozzle. The nozzle is reciprocated in parallel with the bank winding angle so that the coil wire is supplied at a constant speed and tension to obtain a firm bank winding without winding collapse.

[0007]

1 and 2 show an open-magnetic-path type engine ignition coil device which is buried in a cylinder hole 23 formed in a cylinder head portion of the engine and is directly attached to a spark plug 15. FIG. .

[0008] It comprises a cylindrical coil case 1 in which an ignition coil assembly is placed, a plug cover 2 fitted and mounted in an opening below the coil case 1, and a coil cover. The low-voltage terminal socket 3 has a built-in igniter 19 fitted and mounted outside the opening above the case 1.

A primary coil 5 is provided inside the coil case 1.
A coil bobbin 8 around which a secondary coil 7 is wound is coaxially incorporated outside a coil bobbin 6 around which is wound, and a rod-shaped core 9 is inserted into the hollow shaft of the coil bobbin 6 on the primary side. Is stored. Core 9
The permanent magnets 10 are attached to both ends of each of them so that a large change in the amount of magnetic flux can be obtained when the primary current is interrupted.

At the lower end of the secondary coil bobbin 8, a mounting portion 11 for a high voltage terminal is integrally formed so as to protrude from a central portion thereof. Further, a contact spring 13 for making an electrical connection with the ignition plug 15 is mounted on the high-voltage terminal 12 which is bonded and attached to the mounting portion 11.

With the ignition coil assembly positioned in the coil case 1 in a predetermined position, an insulating resin such as epoxy melted inside through a hole 22 formed in the cap 20 of the low voltage terminal socket 3. The resin is injected, and the resin is solidified to be integrally formed.

The coil case 1 is made of a magnetic material such as a silicon steel plate having conductivity and a high magnetic permeability so as to function as a side core for suppressing the generated magnetic flux from spreading outside. Then, the ground terminal 2 in 3 is connected to the low voltage terminal socket so that the electromagnetic shielding effect can be exhibited.
7 and the coil case 1 are connected, and the coil case 1 is held at the ground potential.

Then, inside the coil case 1,
An elastic member 17 such as rubber or elastomer is provided.

A plug rubber 16 that holds the ignition plug 15 and that centers the cylinder hole 23 and absorbs engine vibration is attached to the tip of the plug cover 2.

In the ignition coil device for an engine configured as described above, in particular, as shown in FIG. 3, the secondary coil 7 has an angle θ (eg, 25 °) with respect to the coil bobbin 8.
It is a bank winding in which the layers are sequentially wound in the axial direction one by one while being superposed diagonally.

However, adopting the bank winding eliminates the need for the comb-shaped ribs having a comb-shaped cross section for securing the required withstand voltage in the case of the split winding. Thus, the secondary coil 7 can be wound while maintaining the dielectric strength of each layer.

Here, the number of turns of each layer is reduced from the middle, and a slope winding is used in which the coil diameter D is gradually reduced.
By setting a low withstand voltage to the outside according to the voltage distribution state of the secondary coil 7, the coil case 1 and the secondary coil 7
The thickness of the insulating resin to be filled in between them is reduced so that the diameter of the coil case 1 can be reduced.

According to the present invention, when bank winding of the secondary coil 7 in such an engine ignition coil device is performed, as shown in FIG. 4, while rotating the coil bobbin 8 in the axial direction and moving it in the axial direction, Coil strand 2
9 is reciprocated with a predetermined width w in accordance with the length l of the bank so as to be parallel to the bank winding angle θ, and the coil wire 2 is moved with respect to the coil bobbin 8.
9 are sequentially wound in the axial direction one by one while being superposed obliquely with a banta angle θ.

According to the winding method using the bank winding of the secondary coil 7, since the direction of the reciprocating movement of the nozzle 30 is parallel to the angle θ of the bank winding, the portions A and B where the nozzle 30 moves are The supply speed of the coil wire 29 and the tension of the supplied coil wire 29 do not fluctuate between the portions.

Therefore, the coil wire is always supplied from the nozzle 30 at a constant supply speed and tension without being affected by the reciprocating movement of the nozzle 30, so that a firm bank winding without winding collapse can be performed. become able to.

[0021]

As described above, the method of winding an ignition coil according to the present invention comprises:
While rotating the coil bobbin in the axial direction and moving it in the axial direction, the nozzle that supplies the coil wire on the secondary side is reciprocated with a predetermined width, and the coil wire is obliquely overlapped with the coil bobbin at a predetermined angle. The nozzle is reciprocally moved so as to be parallel to a predetermined angle of the bank winding when sequentially wound in the axial direction one layer at a time, without being affected by the reciprocating movement of the nozzle. There is an advantage that the coil element wire is supplied at a constant supply speed and tension so that a firm bank winding without winding collapse can be performed.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing one configuration example of an ignition coil device of an engine.

FIG. 2 is a plan view of the ignition coil device when a cap of a low-voltage terminal socket is removed.

FIG. 3 is a front sectional view showing a secondary coil formed by bank winding and its coil bobbin.

FIG. 4 is a diagram showing a relationship between a nozzle for supplying coil wire and a bank angle of a coil wound around a coil bobbin according to the bank winding method of the present invention.

FIG. 5 is a diagram showing a relationship between a nozzle for supplying coil wire by a conventional bank winding method and a bank angle of a coil wound around a coil bobbin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil case 2 Plug cover 3 Low voltage terminal socket 5 Primary coil 6 Primary coil bobbin 7 Secondary coil 8 Secondary coil bobbin 9 Core 29 Coil strand 30 Nozzle

Claims (1)

[Claims] A nozzle for supplying a coil wire on the secondary side is reciprocated with a predetermined width while rotating the coil bobbin in the axial direction and moving the coil wire in the axial direction. This is a method of winding an ignition coil by bank winding in which layers are sequentially wound in the axial direction one by one while being superposed diagonally, wherein the nozzle is reciprocated so as to be parallel to a predetermined angle of bank winding. A method for winding an ignition coil.