JPS609111A - Ignition coil for room coil and particularly for igniter - 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 Industrial Application The present invention relates to a house-shaped coil, particularly an ignition coil for an ignition device, comprising a primary winding and a secondary winding arranged on an iron core,
The secondary windings are connected in series by the winding wire material of the same secondary windings in a plurality of winding chambers located one after another in the axial direction of the iron core in a coil body arranged on the iron core. It is divided into individual winding sections, in which case the winding chambers are separated from each other by a partition wall, and the winding wire material passes through recesses provided in the partition wall to form one winding. The winding chamber extends from the winding chamber to the adjacent winding chamber.

Prior Art In already known house-shaped coils, the winding wire is guided from one winding chamber to the adjacent winding chamber through a slit, which slit forms a partition between the two winding chambers. It extends circumferentially in the wall from one side to the other over the width of the partition wall (DE 25 43 836).

This known house-shaped coil provides particularly high stress intensities between the individual winding chambers.

Problems to be Solved by the Invention However, in order to integrally mold the connecting slits on the partition wall in this way, the partition wall must be constructed with a corresponding thickness. Adjacent chambers do not need to have such high stress intensities - In house-shaped coils, the wall thickness of the partition walls between adjacent winding chambers can be chosen relatively thin. In such a case, the winding wire passes through a notch provided in the partition wall that reaches the bottom of the chamber and is led from one winding chamber to an adjacent winding chamber. However, in this case the dimensional stability of the partition wall is significantly weakened. When winding wire material on such a house-shaped coil at ℃, first
After the winding chamber is completely wound, the winding material is introduced into the adjacent empty winding chamber. It is set so that the partition wall does not bend toward the adjacent empty winding chamber in the area of the notch when the winding chamber is opened.

However, this is possible with a solid partition wall of sufficiently thick dimensions. Therefore, the object of the present invention is to improve this known house-shaped coil so that it can be made as small as possible by appropriately forming a notch for passing the winding wire from one winding chamber to an adjacent winding chamber. It is an object of the present invention to provide a house-shaped coil that can guarantee sufficient mechanical and electrical strength of a partition wall even in wall thickness.

Means for Solving the Problem In order to solve this problem, in the structure of the present invention, in the house-shaped coil of the type mentioned at the beginning, the recess provided in the partition wall is located in the lower part of the partition wall. Rather than extending all the way to the top, it only extends from the outside over a portion of the height of the partition wall.

Function Although the wall thickness of the partition wall of the house-shaped coil according to the present invention is thinner than that of the second known one, the recess provided in the partition wall extends from the outside to a part of the height of the partition wall. The strength of the partition wall is increased by the fact that the winding chamber is not extended by ℃.
When the winding chamber is completely wound, one wall of the partition between the winding chamber and the adjacent empty winding chamber will not bend toward the empty winding chamber.

Embodiment FIG. 1 shows an enlarged view of an ignition coil for an ignition system for an internal combustion engine. This ignition coil 10 mainly includes:
It also consists of an iron core 11 having a primary winding 12 and a secondary winding 13 arranged concentrically with respect to the primary winding. 1
The next winding I2 is an insulating sleeve 1 into which the iron core 11 is inserted.
It is located at 4. The secondary winding 13 is configured as a house-shaped coil. The secondary winding 13 is attached to a plurality of winding chambers J5 located one after the other in the axial direction of the iron core 11 in a coil body I6 inserted onto the primary winding 12. The secondary winding 13 is therefore subdivided into a plurality of winding sections 13a that are aligned with each other. The winding chambers 15 are separated from each other by a partition wall 17.

The secondary winding 1513 consists of a very fine lacquered wire.
・It is connected to the fang'shi. In other words, the winding system leads from one winding chamber I5 to the adjacent winding chamber J5 through a recess 18 provided in the partition wall J7.

In FIG. 2, a part of the coil body 16, that is, a partition wall]
By 6! Two adjacent winding chambers J5 separated by a distance are shown enlarged and three-dimensionally. FIG. 2 further shows a recess 18 provided in the partition wall 7 in order to trace the winding wire from the rear winding chamber 5 to the front winding chamber 15.
It is shown.

In order to install the ignition coil 10 in a small space,
The partition wall 17 should be selected to be filled as much as possible. However, the mechanical strength of the partition wall 17 is such that when one winding chamber 15 is completely wound, the partition wall 17 is not pushed toward the adjacent empty winding chamber 15. must be done. Therefore, in order to obtain such particularly good mechanical strength, the recess 18 provided in the partition wall 17 does not extend to the lower region of the partition wall 17, but rather extends from the outside to the height of the partition wall. It extends almost half way into a notch.

As can be seen from FIG. 2, the notch-like recess 18 extends from its bottom to the shoulder 1 formed by the thin wall area 17a of the partition wall J7 to the chamber bottom 0. This shoulder 19 serves to guide the winding phase (not shown) from the fully wound winding chamber 5 to the adjacent empty winding chamber J5. In this case, shoulder 19-1, (1) notch-shaped recess 1
8, the winding on the winding wire side is a straight extension line of the slope of the J-th surface when viewed in the direction, and extends to the chamber bottom 2 (] K. The recess 18 is in the shape of a notch. As a result, the outside of the recess 18 has a width such that the winding chamber 15 can be wound in sequence in a fully automatic manner using a machine in the automatic winding example.In this case, the winding material is The winding chamber 150 is introduced into the recess 18 from the upper position of the winding section, and from there it goes to the shoulder 19 to form the chamber bottom 2 of the adjacent front winding chamber 15.
reaches 0. This winding chamber 15 is then completely wound and the above-described operation is repeated from this winding chamber 15 to the more forward winding chambers. In order to make the dimensional stability of the coil body 16 as uniform as possible over its entire circumference, the recesses J8 of adjacent partition walls 17, viewed in the axial direction of the coil body 16, are each offset from one another by approximately 180°. Therefore, in Figure 1 there are 4
Notch-shaped recesses J8 in two of the partition walls 17 are shown. The primary winding J2 and the secondary winding J3, which are arranged coaxially and one above the other, are connected via a conductor 21, and are in contact with a conductor connection portion (not shown). Primary winding J2 and secondary winding 1
3 is then surrounded by casting resin 22, which again completely fills the cutout-shaped recess 18, so that even in this area the voltage strength between the winding chambers is increased. It becomes certain.

The invention is not limited to the embodiments shown and described. This is because whenever the mechanical strength and shape stability, rather than the voltage strength between the winding chambers 1, are the major factors for determining the thickness of the partition wall, the winding phase This is because a recess for passage can be realized even in a house-shaped coil in a different range of use.

Effects of the Invention As can be seen from the second point, in the house-shaped coil of the present invention, the lower part of the partition wall remains even within the recess, so the shape stability of the partition wall is affected by the recess. You will almost never receive it. This makes it possible to reduce the wall thickness of the partition wall in the house-shaped coil according to the invention compared to the known case, provided that the shape is stable or equal, and thus to reduce the structural height of the house-shaped coil. . In addition, the reduction in structural height saves on side slopes, which also has the advantage of lowering the manufacturing cost of the house-shaped coil.

In addition, by the means described in the dependent claims,
Advantageous embodiments of the house-shaped coil according to the invention are possible. % The statement in claim 2 is particularly advantageous, and the statement in claim 3 is extremely advantageous in winding several winding chambers in a fully automatic manner. It is. In this case, it is also advantageous to have the structure as described in claim 4.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of an ignition coil as an embodiment of the present invention, and FIG. 2 is a three-dimensional view of a portion of the coil body of the ignition coil shown in FIG.

Claims (1)

[Claims] 1. A house-shaped coil comprising a primary winding and a secondary winding disposed on an iron core, wherein the secondary winding is a coil body disposed on the iron core. In a plurality of winding chambers located one after the other in the axial direction, partial pressures of individual windings connected in series are divided by the winding wire material of the same secondary winding, and in this case, the winding chambers are separated from each other by a partition wall, and the winding i1 JS extends from one winding chamber to the adjacent winding chamber through a recess provided in the partition wall. It is characterized in that the recess (18) provided in the partition wall (17) does not extend to the lower area of the partition wall (17), but only extends from the outside over a portion of the height of the partition wall. A house-shaped coil. 2. The house-shaped coil according to claim 1, wherein the recess (18) is cut out and reaches half the height of the partition wall from the outside. 3. By means of a thin wall area (17a) of each partition wall (17) to guide the winding member from one fully wound winding chamber (15) to the adjacent empty winding chamber (15). 2. The winding chamber according to claim 2, wherein a formed shoulder (19) extends from the bottom of the cut-out recess (18) to the base (20) of the empty winding chamber (15). House-shaped coil. 4. The winding wire material of the recess (18) whose shoulder part (19) is notched is placed on a straight extension of the slope of the first surface (+8a) when viewed from the direction of the chamber bottom (20). The house-shaped coil according to claim 3, which extends to. 5. Any one of claims 1 to 4, wherein the recesses (18) of adjacent partition walls (17) in the axial direction of the coil body (16) are offset from each other by approximately 180°. The house-shaped coil described.