JP3770759B2 - Ignition coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ignition coil, and more particularly to an ignition coil that is improved in the recycling rate.
[0002]
[Prior art]
Recently, efficient recovery and reuse of resources in various fields, so-called recycling is desired, but in the case of ignition coils used in internal combustion engines, vibration resistance, water resistance, heat resistance, etc. are required. For this reason, usually, after the coil portion is accommodated in the coil case, a thermosetting resin (for example, epoxy resin) is filled, and the coil portion is embedded and fixed in the resin.
[0003]
[Problems to be solved by the invention]
Thus, in the ignition coil according to the prior art, since the coil portion is embedded and fixed in the filling resin, it is difficult to disassemble when discarding the ignition coil, and the coil portion or the like must be discarded as it is. The recycling rate was low.
[0004]
Accordingly, an object of the present invention is to provide an ignition coil that solves the above-described problems and that improves the recycling rate, thereby efficiently recovering and reusing resources.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in claim 1, in the ignition coil in which one end of the core is configured to be openable, and a coil portion including a primary coil and a secondary coil is built in a coil case, the primary the coil and the secondary coil while fabricated from self-bonding wire, the coil portion partially fixed by an elastic material having an adhesive on a bottom surface of the coil case, thus removably said coil portion from said coil case It comprised as follows.
[0006]
In this way, openable configure one end of the core, the ignition coil with a built-in coil portion consisting of a primary coil and a secondary coil in the coil case, to fabricate a primary coil and a secondary coil from self-fusing line In addition, the coil portion is partially fixed to the bottom surface of the coil case by an elastic material having adhesiveness , so that the coil portion can be freely detached from the coil case , in other words, the coil portion and the coil case. The space between the inner wall and the inner wall is not filled with resin, and it is made from self-bonding wire and bobbin-less is possible, so that when the ignition coil is discarded, the coil part can be easily separated and recovered, improving the recycling rate. Therefore, efficient recovery and reuse of resources can be achieved. Also, the core can be easily separated.
[0007]
Further, since the primary coil and the secondary coil are configured to be fixed in the coil case with an elastic material having excellent vibration absorption, vibration resistance equal to or higher than that of the ignition coil according to the prior art can be provided. .
[0008]
Furthermore, by using self-bonding wires, copper wires can be adjacent to each other via a self-adhesive layer (and insulating layer), and copper wires can be kept airtight and liquid-tight so that they are water resistant. Since the insulation between the copper wires can be improved and the leakage between them can be reduced, the ignition voltage characteristics can be improved such that the ignition voltage can be increased.
[0009]
In claim 2, wherein, further, said with a built-in ignition control circuit unit Koiruke scan it was composed as partially fixed to the bottom surface of the coil case by the elastic member having a tack of said ignition control circuit unit .
[0010]
Thereby, when the ignition coil is discarded, the ignition control circuit unit can be easily separated and collected, and the recycling rate can be further improved.
[0011]
Further, since the ignition control circuit unit is configured to be fixed by an elastic material having excellent vibration absorption, vibration resistance equivalent to or higher than that of the ignition coil according to the prior art can be provided.
[0012]
According to a third aspect of the present invention, the primary coil and the secondary coil are integrally joined through an adhesive.
[0013]
Thereby, while being able to improve the insulation between a primary coil and a secondary coil, it can assemble easily by joining integrally and making it a coil part, and can improve work efficiency.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an ignition coil according to an embodiment of the present invention will be described with reference to the accompanying drawings.
[0015]
1 is a side sectional view of the ignition coil, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a top view of the ignition coil shown in FIG. FIG. 2 is a top view of a state in which a case lid is attached (the state shown in FIG. 1).
[0016]
In the following, the ignition coil 10 according to the present invention includes an outer case (coil case) 12 and a core (iron core) 14 having a generally C-shaped cross section attached thereto.
[0017]
The outer case 12 includes a case main body 12a having a substantially cylindrical shape with one end opened and a case lid 12b closing the open end. Both the case main body 12a and the case cover 12b are manufactured from PBT. In addition, 12c is a drain hole.
[0018]
The core 14 includes a core piece 14a having an inverted L-shaped cross section and a core piece 14b having an I-shaped cross section. The core pieces 14a and 14b are configured to be removable and configured to be openable at one end 14c thereof.
[0019]
The core 14 is attached to the outer case 12 by inserting the core piece 14b into the central through hole of the case body 12a of the outer case 12 and attaching the case lid 12b, and then assembling the core piece 14a.
[0020]
The core 14 is notched at an end facing the one end 14c, and is curved according to a circular flywheel 16 of an internal combustion engine (not shown) that rotates in close proximity so that the separation distance is uniform. Is done. That is, the core 14 is configured to form a closed magnetic flux circuit using the flywheel 16.
[0021]
The core 14 is formed by stacking gradient silicon steel plates. In the graded silicon steel plate, silicon is unevenly distributed on the surface side, so there is less iron loss and magnetic saturation characteristics than silicon steel material with general orientation, so-called directivity, in which silicon is uniformly distributed. Also excellent. Reference numeral 14d denotes a mounting hole.
[0022]
A coil portion 24 including a primary coil 20 and a secondary coil 22 is accommodated in the outer case 12. That is, the primary coil 20 is disposed on the outer periphery of the core piece 14b of the core 14, and the secondary coil 22 is disposed on the outer periphery of the primary coil 20 as shown in FIG.
[0023]
Both the primary coil 20 and the secondary coil 22 are manufactured using a self-bonding wire made of PIW (so-called cementing enameled wire with a self-adhesive layer provided on the surface of various synthetic enameled wires) 200 as a winding. .
[0024]
As schematically shown in FIG. 5, the self-bonding wire 200 includes a copper wire 200 a, an insulating layer 200 b formed on the outer periphery thereof, and a self-adhesive layer 200 c formed on the outer periphery thereof.
[0025]
The primary coil 20 and the secondary coil 22 are formed in a cylindrical shape as schematically shown in FIG. 6 after the self-bonding wire 200 is wound around a rod (not shown) and heated and then cooled. The coil portion 24 is completed by integrally joining with an adhesive 24a. By using the self-bonding wire 200 in this way, the primary coil 20 and the secondary coil 22 can be easily manufactured without requiring a bobbin.
[0026]
As the adhesive material 24a, for example, a hot-melt adhesive material based on polyamide, EVA, or polyolefin, which is a thermoplastic polymer, is used.
[0027]
The coil portion 24 composed of the primary coil 20 and the secondary coil 22 manufactured as described above is fixed to the bottom surface of the case body 12a using an elastic material 26 having adhesiveness. As the elastic material 26, for example, silicon gel is used. Silicon gel is excellent in vibration absorption and also has adhesiveness.
[0028]
Thus, the coil portion 24 is not embedded in the resin mold resin and fixed in the case main body 12a, but is fixed in the case main body 12a by the elastic material 26. Accordingly, the coil portion 24 and the space 24b in the case main body 12a are left as a gap.
[0029]
The case body 12a is partitioned at one side to form a compartment 12d, in which the ignition control circuit unit 30 is accommodated. The ignition control circuit unit 30 is fixed to the bottom surface of the case main body 12a with the same kind of elastic material 32, like the coil portion 24.
[0030]
The ignition control circuit unit 30 includes a waveform shaping circuit, a switching element (power transistor), and the like. As is well known, the primary coil 20 is energized from a battery power source (not shown) in accordance with a command from a control unit (not shown), The energization is cut off at the timing to cause the secondary coil 22 to generate an ignition voltage.
[0031]
The ignition control circuit unit 30 is formed of a ceramic substrate and includes two leads 30a and 30b for connecting the primary coil 20 to the battery power source and the ground side as shown in FIG. The leads 30a and 30b are made of a brass material.
[0032]
An inner cap 34 is provided near the open end of the case body 12a. The inner cap 34 is configured to abut against the coil portion 24 and press the coil portion 24 against the bottom surface of the case body 12a. The inner cap 34 is manufactured from PBT similarly to the case main body 12a. Reference numeral 34a denotes a drain hole.
[0033]
The inner cap 34 is projected in a cylindrical shape in the vicinity of the upper part of the compartment 12d of the case main body 12 to form a high tension cord outlet 36, in which a high tension cord (shown in phantom lines in FIG. 1 and the like) 38 is formed. Is configured to be fitted. The high tension cord outlet is provided with a terminal 36 a (made of brass) having an L-shaped cross section for connection to the secondary coil 22. FIG. 3 shows the upper end side of the terminal 36a.
[0034]
The ignition coil 10 according to this embodiment includes a stop terminal 42. The stop terminal 42 comes into contact with the lead 42b, and when pressed by an operator or the like, the ignition is stopped and the internal combustion engine is immediately stopped via a circuit (not shown).
[0035]
The connection between the primary coil 20 and the two leads 30a and 30b of the ignition control circuit unit 30 will be described. As shown in FIG. 3, from the terminals 20a and 20b of the primary coil 20 and the ignition control circuit unit 30. The extending leads 30a and 30b are joined by fusing, that is, the terminals 20a and 20b and the leads 30a and 30b are joined by applying a large current while being heated and melted. (The thickness of the molding material 44 is exaggerated in FIG. 1).
[0036]
In other words, the terminals 20a and 20b and the leads 30a and 30b are joined without using solder bonding using a lead material, and the joint is partially molded and fixed by the molding material 44.
[0037]
Similarly, the terminal 22a of the secondary coil 22 and the terminal 36a (the lower end side of the L-shaped cross section) of the high tension cord outlet 36 are also joined by fusing and then partially molded and fixed by the molding material 46. . The other terminal of the secondary coil 22 is connected to the primary coil 20 at a position not shown.
[0038]
As the molding materials 44 and 46, the same type of hot melt adhesive as that of the adhesive 24a is used.
[0039]
Further, since this connection work is performed on the inner cap 34, the inner cap 34 can be used as a work table, the connection work is facilitated, the process can be simplified, and the reliability can be improved. it can.
[0040]
Here, the manufacturing process of the ignition coil 10 will be outlined.
[0041]
First, the case body 12a, the case lid 12b, and the inner cap 34 are manufactured from PBT, and the core pieces 14a and 14b are manufactured from an inclined silicon steel plate, while the primary coil 20 and the secondary coil 22 are as described above. The coil part 24 is manufactured by using the self-bonding wire 200 and joining with the adhesive 24a. The ignition control circuit unit 30 is also manufactured as a ceramic substrate.
[0042]
Next, the elastic members 26 and 32 are applied to the bottom surface of the case body 12a, and the coil portion 24 and the ignition control circuit unit 30 are assembled and fixed. Next, the inner cap 34 is attached, the terminals are joined by fusing, and the joined portion is molded (coated) with the molding materials 44 and 46.
[0043]
Next, when the case lid 12b is attached and the core is inserted, the ignition coil 10 is completed. Thereafter, it is attached to a predetermined position of the internal combustion engine through an attachment hole 14d drilled in the core 14, and the high tension cord 38 is fitted into the high tension cord outlet 36, and the ignition control circuit unit 30 is connected to the battery power source and the control unit. Just connect.
[0044]
In this embodiment, as described above, in the ignition coil 10 configured such that one end of the core 14 can be opened and the coil portion 24 including the primary coil 20 and the secondary coil 22 can be freely detached. The primary coil 20 and the secondary coil 22 are manufactured from the self-bonding wire 200, and are configured to be fixed in the coil case (the case main body 12a and the case lid 12b) by an elastic material (for example, silicon gel) 26.
[0045]
Thus, one end opening configured to be capable of the core 14, the ignition coil with a built-in coil unit 24 consisting of the primary coil 20 and secondary coil 22 to the coil case (case body 16a), the primary coil 20 and 2 The secondary coil 22 is manufactured from the self-bonding wire 200, and the coil part 24 is partially fixed to the bottom surface of the coil case (case body 16a) by an elastic material 26 having adhesiveness. In other words, the space 24b between the coil portion 24 and the case body 12a is configured not to be filled with resin, and the self-bonding wire 200 is used. By making the bobbinless possible, when the ignition coil 10 is discarded, the coil portion 24 can be easily separated and recovered, and the recycling rate can be improved. It can be, therefore it is possible to achieve an efficient recovery and reuse of resources. Also, the core can be easily separated.
[0046]
In addition, since the primary coil 20 and the secondary coil 22 are configured to be fixed in the coil case by an elastic material (for example, silicon gel) 26 having excellent vibration absorption, it is equal to or more than the ignition coil according to the prior art. Vibration resistance can be provided.
[0047]
By using the self-bonding wire 200, the copper wire 200a is adjacent to the self-adhesive layer 200c (and the insulating layer 200b). As a result, the number of windings per unit area decreases, but the core 10 is inclined. The required ignition voltage can be obtained by using the flywheel 16 as a part of the magnetic flux path.
[0048]
On the other hand, adjoining the copper wire 200a through the self-adhesive layer 200c (and the insulating layer 200b) can keep the copper wire 200a air-tight and liquid-tight so as to improve water resistance, and improve the copper wire 200a. Since the insulation between them can be improved and the leakage between them can be reduced, the ignition voltage characteristics can also be improved, such as the ignition voltage can be increased.
[0049]
Furthermore, partial to the bottom of the Koiruke scan with a built-in ignition control circuit unit 30 (the case body 16a), said coil case by the elastic member 32 with an adhesive to the ignition control circuit unit 30 (case body 16a) It was comprised so that it might fix to.
[0050]
Thereby, when the ignition coil 10 is discarded, the ignition control circuit unit 30 can be easily separated and collected, and the recycling rate can be further improved.
[0051]
Further, since the ignition control circuit unit 30 is configured to be fixed by an elastic material (for example, silicon gel) 32 having excellent vibration absorption, vibration resistance equivalent to or higher than that of the ignition coil according to the prior art can be provided. .
[0052]
Further, the primary coil 20 and the secondary coil 22 are configured to be integrally joined through an adhesive 24a.
[0053]
Thereby, while being able to improve the insulation between the primary coil 20 and the secondary coil 22, assembling becomes easy by joining integrally and making it the coil part 24, and improving work efficiency. Can do.
[0054]
Further, in the ignition coil 10 in which the coil portion 24 including the primary coil 20 and the secondary coil 22 and the ignition control circuit unit 30 are built in the coil case (case body 12a), the terminals 20a and 20b of the primary coil 20 and the above-mentioned The terminal 30a of the ignition control circuit unit is joined by fusing, and the joint is partially molded, more specifically, partially molded via the molding material 44.
[0055]
As a result, since solder bonding is not used, it becomes easy to comply with the lead disposal regulations, and by partially molding through the molding material 44, the coil part 24 can be separated and collected more easily, and the recycling rate is improved. Therefore, efficient recovery and reuse of resources can be achieved.
[0056]
Furthermore, by performing partial molding via the molding material 44, the water resistance and vibration resistance of the joint are not lost.
[0057]
Further, the terminal 24a of the secondary coil 24 and the terminal 36a of the high tension cord take-out port 36 are joined by fusing, and the joined portion is partially molded, more specifically, partially molded via the molding material 46.
[0058]
As a result, it becomes easy to comply with lead disposal regulations, and by using the molding material 46 as a partial mold, the coil part 24 can be separated and collected more easily, and the recycling rate can be improved.
[0059]
Further, an inner cap 34 in which the high tension cord outlet 36 is integrally formed is disposed on the terminals 20a and 20b side of the primary coil 20 and the secondary coil 22 inside the coil case (case body 12a). The fusing and partial molding were performed on the inner cap.
[0060]
As a result, the inner cap 34 can be used as a work table, the connection work can be facilitated, the process can be simplified, and the reliability can be improved.
[0061]
In the ignition coil 10 described above, a part of the flywheel 16 adjacent to the core 14 is used as a magnetic flux path. However, the present invention is not limited to this, and a closed magnetic flux circuit is formed only by the core 14. You may do it.
[0062]
【The invention's effect】
In the claim 1, wherein, to releasably constituting one end of the core, the ignition coil with a built-in coil portion consisting of a primary coil and a secondary coil in the coil case, the self fusing a primary coil and a secondary coil In addition to manufacturing from the wire, the coil portion is partially fixed to the bottom surface of the coil case by an elastic material having adhesiveness, and thus the coil portion is configured to be removable from the coil case , in other words, The space between the coil part and the inner wall of the coil case is configured not to be filled with resin, and it can be manufactured from a self-bonding wire so that it can be bobbin-free. Thus, the recycling rate can be improved, so that efficient recovery and reuse of resources can be achieved. Also, the core can be easily separated.
[0063]
Further, since the primary coil and the secondary coil are configured to be fixed in the coil case with an elastic material having excellent vibration absorption, vibration resistance equal to or higher than that of the ignition coil according to the prior art can be provided. .
[0064]
Furthermore, by using self-bonding wires, copper wires can be adjacent to each other via a self-adhesive layer (and insulating layer), and copper wires can be kept airtight and liquid-tight so that they are water resistant. Since the insulation between the copper wires can be improved and the leakage between them can be reduced, the ignition voltage characteristics can be improved such that the ignition voltage can be increased.
[0065]
According to the second aspect of the present invention, when the ignition coil is discarded, the ignition control circuit unit can be easily separated and collected, and the recycling rate can be further improved.
[0066]
Further, since the ignition control circuit unit is configured to be fixed by an elastic material excellent in vibration absorption, vibration resistance equal to or higher than that of the ignition coil according to the prior art can be provided.
[0067]
In Claim 3, while being able to improve the insulation between a primary coil and a secondary coil, it joins integrally and it becomes a coil part, Assembling becomes easy and improves work efficiency. be able to.
[Brief description of the drawings]
FIG. 1 is an explanatory side sectional view of an ignition coil according to the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
3 is a top view of the ignition coil shown in FIG. 1 with a case main body cover removed. FIG.
4 is a top view of a state in which a cover of a case main body is attached and completed as an ignition coil from the state shown in FIG. 3. FIG.
5 is an explanatory sectional view schematically showing a self-bonding wire used in the coil portion of the ignition coil shown in FIG. 1. FIG.
6 is an explanatory perspective view schematically showing the manufacture of the coil portion of the ignition coil shown in FIG. 1. FIG.
[Explanation of symbols]
10 Ignition coil 12 Outer case (coil case)
14 Core 20 Primary coil 20a, 20b Primary coil terminal 22 Secondary coil 22a Secondary coil terminal 24 Coil portion 24a Connecting material 26, 32 Elastic material 30 Ignition control circuit unit 34 Inner cap 36 High tension cord outlet 36a High tension Cord outlet port 38 High tension cords 44, 46 Mold material 200 Self-bonding wire

Claims (3)

One end of the core and releasably configuration, in the ignition coil with a built-in coil portion consisting of a primary coil and a secondary coil in the coil case, the primary coil and the secondary coil while fabricated from self-bonding wire, wherein ignition coil the coil portion by an elastic member having a tacky partially fixed to the bottom surface of the coil case, thus, characterized in that the coil portion is freely removed from the coil case. Further, the with a built-in ignition control circuit unit Koiruke scan, claimed 1, wherein, characterized in that partially fixed to the bottom surface of the coil case by the elastic member having a tack of said ignition control circuit unit Ignition coil.   The ignition coil according to claim 1 or 2, wherein the primary coil and the secondary coil are integrally joined via an adhesive.

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