JPH06325954A - Ignition coil for internal combustion engine, and its manufacture - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of an ignition coil and improve its manufacturing efficiency, by contacting its high-voltage output terminal with a metallic fitting for a relaying terminal of its high-voltage side and contacting its contact part with a metallic fitting for a relaying terminal of its low-voltage side while inserting its primary bobbin into the inside of its secondary bobbin. CONSTITUTION:A primary coil 2 is wound around a primary bobbin 1 having at its one end a flange plate part 102 whereon a high-voltage output terminal 6 is mounted. A part of the coil conductor wherewith the primary coil 2 is constituted is exposed to the outside of a flange part 103 provided at the other end of the primary bobbin 1, and a contact part 201 is formed out of this exposed part. Then, one and the other ends of a secondary coil 4 are connected respectively with metallic fittings 7, 8 for relaying terminals which are mounted respectively on one and the other ends of a secondary bobbin 3. Further, the primary bobbin 1 is inserted into the inside of the secondary bobbin 3, and the high-voltage output terminal 6 and the contact part 201 are contacted respectively with the metallic fittings 7, 8 for the relaying terminals. Thereby, the electric connection between one end of the secondary coil and the high- voltage output terminal and the electric connection between the other end of the secondary coil and the primary coil can be performed simply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil for an internal combustion engine and a method for manufacturing the ignition coil.

[0002]

2. Description of the Related Art An ignition coil used in an internal combustion engine ignition device comprises a primary coil wound around a primary bobbin and a secondary coil wound around a secondary bobbin. It is arranged concentrically outside the coil. A collar plate portion is provided at one end of the primary bobbin, a high voltage cord connecting portion is provided on the collar plate portion, and a high voltage output terminal is attached to the high voltage cord connecting portion. One end of the secondary coil is electrically connected to the high voltage output terminal, and the other end is connected to the end of the primary coil.

[0003]

In a conventional ignition coil for an internal combustion engine, after a secondary bobbin wound with a secondary coil is fitted around the outer circumference of a primary bobbin wound with a primary coil,
The terminal part of the primary coil and the terminal part of the other end of the secondary coil are wound around the terminal fitting attached to the flange of the secondary bobbin and soldered, and one end of the secondary coil is soldered to the high voltage terminal fitting. It was Therefore, there is a problem that a lot of labor is required for the connection work after combining the primary coil and the secondary coil, and the manufacturing efficiency is reduced.

An object of the present invention is to automatically connect the primary coil and the secondary coil and the secondary coil and the high voltage output terminal when the primary coil and the secondary coil are combined. It is an object of the present invention to provide an ignition coil for an internal combustion engine and a method for manufacturing the same, which enables the manufacturing to be facilitated and the manufacturing efficiency to be improved.

[0005]

According to the present invention, there is provided a primary bobbin having, at one end thereof, a collar plate portion having a high voltage cord connecting portion to which a high voltage output terminal is attached, and a primary bobbin wound around the primary bobbin.
An ignition coil for an internal combustion engine, which comprises a secondary coil, a secondary bobbin, and a secondary coil wound around the secondary bobbin, and one end of the secondary coil is electrically connected to a high-voltage output terminal. It is related.

In the present invention, a contact portion is provided on the other end side of the primary bobbin, which is directly connected to the end portion of the primary coil or through a coil portion forming a part of the primary coil. Further, a high voltage side relay terminal metal fitting is attached to one end of the secondary bobbin, one end of the secondary coil is connected to the high voltage side relay terminal metal fitting, and a low voltage side relay terminal metal fitting is attached to the other end of the secondary bobbin to Connect the other end of the secondary coil to the relay terminal fitting. Then, the primary bobbin is inserted inside the secondary bobbin, the high voltage output terminal is brought into contact with the high voltage side relay terminal, and the contact portion is brought into contact with the low voltage side relay terminal fitting.

In order to provide the contact portion, it is preferable to provide a conductor hooking portion on the outer peripheral portion of the other end of the primary bobbin. When such a conductor hooking portion is provided, a part of the coil conductor forming the primary coil is hooked on the conductor hooking portion, and the outer surface of the conductor hooking portion of the coil conductor hooked on the conductor hooking portion is provided. It is possible to remove the insulating coating on the portion along the line and use the portion from which the insulating coating has been removed as the contact portion.

In the manufacturing method of the present invention, a primary bobbin having a collar plate portion having a high voltage cord connecting portion to which a high voltage output terminal is attached at one end and a conductor hooking portion at the other end is used. The primary coil is wound around the primary bobbin in a layer,
When the final layer is wound, a part of the coil conductor constituting one turn of the final layer is hooked on a conductor hooking portion, and then the final layer is wound up.
A contact part forming step of removing a part of the coil conductor forming one turn of the final layer of the next coil along the outer surface of the conductor latching part, and using the part from which the insulating cover is removed as a contact part. A secondary bobbin having a high voltage side relay terminal metal fitting at one end and a low voltage side relay terminal metal fitting at the other end was used to connect one end to the high voltage side relay terminal metal fitting and the other end to the low voltage side relay terminal metal fitting. A secondary coil winding step of winding a secondary coil around the secondary bobbin, and inserting the primary bobbin inside the secondary bobbin to form a high voltage output terminal and a contact part on a high voltage side relay terminal metal fitting and a low voltage side, respectively. The coil assembly process of contacting the relay terminal fitting is performed.

The order of the primary coil winding step and the secondary coil winding step does not matter.

[0010]

As described above, the contact portion connected to the primary coil is provided at the end portion of the primary bobbin opposite to the flange plate portion, and one end and the other end of the secondary coil are provided at one end and the other end of the secondary bobbin, respectively. When a high-voltage side relay terminal fitting and a low-voltage side relay terminal fitting connected to the end are provided and the primary bobbin is inserted inside the secondary bobbin, the high-voltage output terminal and the contact portion have a high-voltage side relay terminal and a low-voltage side relay terminal, respectively. When the primary coil and the secondary coil are combined with each other, between the one end of the secondary coil and the high voltage output terminal, and the other end of the secondary coil and the primary coil. Since the electrical connection can be automatically performed, it is possible to improve the manufacturing efficiency of the ignition coil by omitting the troublesome wiring work which is conventionally required after combining the primary coil and the secondary coil.

As described above, the conductor hooking portion is provided on the outer peripheral portion of the other end of the primary bobbin, and a part of the coil conductor which constitutes the primary coil is hooked on the conductor hooking portion so that the coil conductor If the insulating coating on the portion along the outer surface of the conductor latching portion is removed and the portion where the insulating coating is removed is used as the contact portion,
Since the contact portion for contacting the low-voltage side relay terminal can be configured by using the coil conductor itself of the primary coil, it is possible to increase the number of parts and to eliminate the trouble of connecting the terminal portion of the primary coil to the contact. A connecting portion between the primary coil and the secondary coil can be configured.

[0012]

1 and 2 show the overall construction of an ignition coil according to an embodiment of the present invention. FIG. 1 is a sectional view taken along the line A--A of FIG. 2, and FIG. 2 is taken along the line B-- of FIG. It is a B line sectional view. In these figures, 1 is a primary bobbin made of a resin molded product, 2 is a primary coil wound on a primary bobbin, 3 is a secondary bobbin made of a resin molded product, 4 is a secondary bobbin. The formed secondary coils and 5 are resin cases.

As shown in FIGS. 3A and 3B, the primary bobbin 1 has a body portion 101 having a substantially oval cross-sectional shape.
And a collar plate portion 102 provided on one end side of the body portion, and a collar portion 103 provided on the other end side of the body portion 101,
A cylindrical high-voltage cord connecting portion 104 is provided in a portion near the outer periphery of the collar plate portion 102. High voltage cord connection part 10
4 is provided with its axis oriented in a direction parallel to the axis of the coil, and a wood-screw-shaped high-voltage output terminal 6 is attached through the bottom thereof. A pair of projecting portions 105 and 106 are provided at symmetrical positions on the side surface of the collar plate portion 102, and one pair of tongue-shaped ones extending in the axial direction of the coil with one end embedded in these projecting portions. Next terminal fitting 1
07 and 108 are attached. Primary terminal 107
And 108 are provided with lead terminals 109 and 110, respectively, which extend in a direction perpendicular to the axis of the coil, and these lead terminals are made to project from the projecting portions 105 and 106 in the same direction.

Three rib-shaped projections 111a to 111 are formed on the outer end surface of the flange portion 103 provided on the other end side of the primary bobbin 1.
c are provided at intervals of 90 degrees. These protrusions are provided such that their respective tip portions project further outward in the radial direction than the outer periphery of the collar portion 103, and the portion of the one protrusion 111b provided at the center that protrudes from the outer periphery of the collar portion 103. Is a conductor hooking portion 112.

In the collar plate portion 102 of the primary bobbin 1, a positioning hole 114 and a locking hole 11 into which a positioning projection and a locking projection provided on a secondary bobbin, which will be described later, are inserted, respectively.
5 are provided.

The primary coil 2 is wound in a layered manner by winding a coil conductor, which is insulated and coated on the body portion 101 of the primary bobbin, into a cylindrical shape. In this example, as shown in FIG. 4, a part of the coil conductor 2a forming one turn on the winding start side of the final layer of the primary coil is part of the conductor hooking portion 11.
The insulating coating on the portion of the conductor 2a which is hooked on the second layer and which constitutes one turn of the final layer along the outer end surface of the conductor latching portion 112 is removed, and the contact portion 201 is formed by the portion where the insulating coating is removed. ing. A part of one turn at the beginning of winding of the final layer is hooked on the conductor hooking portion 112, and then the final layer is wound to the end to wind up the primary coil 2.

One end (end portion on the winding start side) 2A of the primary coil 2 is connected to the primary terminal fitting 107 by the lead terminal 1.
It is wound around 09 and is electrically connected to the lead terminal. Further, the other end (terminal portion on the winding end side) 2B of the primary coil 2 is wound around a lead terminal 110 connected to the primary terminal fitting 108 and electrically connected to the lead terminal.

The secondary bobbin 3 is formed by forming a large number of coil winding grooves 302, 302, ... Arranged in the axial direction on the outer periphery of the body 301, and is wound around the coil winding grooves 302, 302 ,. The unit coils 4a, 4a, ... Are connected in series to form the secondary coil 4.

A high voltage side relay terminal fitting 7 is attached to one end of the secondary bobbin 3. As shown in FIG. 6, the high-voltage side relay terminal fitting 7 used in the present embodiment is formed by bending a conductor having a rectangular cross section into a J-shape, and the folded-back portion 7a is formed on one end side of the secondary bobbin 3. It is press-fitted in the groove portion provided. The long side portion 7b of the relay terminal fitting 7 is obliquely bent from the middle portion thereof, and one end 4A of the secondary coil 4 is wound around the short side portion 7c.

As shown in FIG. 5B, the secondary bobbin 3
A low voltage side relay terminal fitting 8 is attached to the other end side of the. The low-voltage side relay terminal fitting 8 is made of a plate-shaped member formed by punching, and holes provided at two positions thereof are fitted into the projection 303 formed on the end surface of the secondary bobbin. The head of the is crimped in a heated state, and the terminal fitting 8 is fixed to the end surface of the secondary bobbin.
A notch portion 304 is formed by cutting a part of the flange portion at the other end of the secondary bobbin 3, and the one end 8a of the low-voltage side relay terminal fitting 8 is arranged so as to project radially from the notch portion 304. There is. The other end 8b of the low-voltage side relay terminal fitting 8 is made to project radially inward from the inner circumference of the secondary bobbin. The other end 4B of the secondary coil 4 is wound around one end of the low voltage side relay terminal fitting 8.

At one end of the secondary bobbin 3, there is also a mushroom-shaped locking projection 30 having a positioning projection 305 protruding in the axial direction and an elastically deformable enlarged head 306a at the tip.
6 and 6 are provided corresponding to the positioning hole 114 and the locking projection 306 of the primary bobbin, respectively.

In this embodiment, the body portion of the primary bobbin 1 is inserted inside the body portion of the secondary bobbin 3, and the positioning protrusion 305 is inserted.
Is inserted into the positioning hole 114, and the locking projection 306 is fitted into the locking hole 115, the head 6a of the high-voltage output terminal 6 is
The positions and shapes of the relay terminal fittings 7 and 8 are set so that the contact portion 201 and the contact portion 201 contact the high voltage side relay terminal fitting 7 and the low voltage side relay terminal fitting 8 with a predetermined contact pressure, respectively. The contact state between the contact portion 201 and the low-voltage side relay terminal fitting 8 is shown in FIG.

2 and 5B, 307
Is a reinforcing rib formed on the other end surface of the secondary bobbin.

In the method for manufacturing the ignition coil of the present invention, the primary coil 2 is layer-wound on the primary bobbin 1 and when the final layer is wound, the coil conductor 2a constituting one turn of the final layer is wound. The primary coil winding step of winding a final layer after hooking a part of it on the conductor hooking portion 112, and winding the secondary coil 4 around the secondary bobbin 3, one end and the other end of which are respectively high voltage side relay terminals. The secondary coil winding step for connecting to the metal fitting 7 and the low-voltage side relay terminal metal fitting 8 is separately performed. Therefore, each coil can be efficiently wound without requiring labor such as wire connection work between the primary coil and the secondary coil.

Prior to combining the primary coil and the secondary coil, the insulating coating on the portion along the outer surface of the conductor latching portion of the coil conductor 201 which constitutes one turn of the final layer of the primary coil is removed. Then, a contact part forming step is performed in which the part from which the insulating coating is removed is used as the contact part 201. The removal of the insulating coating in the contact portion forming step can be easily performed by spraying sand on the coil conductor (sandblasting) or by lightly sanding the coil conductor.

After performing the contact point forming step, the body of the primary bobbin 1 having the primary coil wound therein is inserted inside the body of the secondary bobbin 3 having the secondary coil wound therein, A coil assembly process is performed in which the head portion 6a of the high-voltage output terminal 6 and the contact portion 201 are brought into contact with the high-voltage side relay terminal fitting 7 and the low-voltage side relay terminal 8, respectively. In this step, the positioning protrusion 305 of the secondary bobbin 3 is inserted into the positioning hole 114 of the primary bobbin, the locking protrusion 306 is fitted into the locking hole 115, and the primary bobbin and the secondary bobbin are coupled to each other. The head of the high-voltage output terminal 6 and the contact portion 201 are brought into contact with the high-voltage side relay terminal fitting 7 and the low-voltage side relay terminal fitting 8, respectively.

As described above, in the present invention, the electrical connection between the primary coil and the secondary coil is automatically performed by inserting the primary bobbin inside the secondary bobbin without soldering. Since the connection and the connection between the secondary coil and the high voltage output terminal can be performed, the assembly of the ignition coil can be simplified.

As described above, the primary coil 1
After forming the coil assembly 10 by combining the secondary bobbin and the secondary bobbin around which the secondary coil is wound, the coil assembly is inserted into the case 5 and the iron core is placed inside the body 101 of the primary bobbin 1. After inserting (not shown), an insulating resin such as epoxy resin is cast into the case 5 and the resin is cured to fix the coil assembly and the iron core in the case.

The case 5 is formed in a tubular shape, and an outer peripheral portion thereof has a bulging portion 501 for accommodating the high-voltage cord connecting portion 104 inside and a bulging portion for accommodating the lead terminals 109 and 110 inside thereof. 502 and 503 are formed. Further, the body 1 of the primary bobbin 1 is provided on the bottom of the case 5.
A concave portion 505 for fitting the end portion of 01 is formed.

The outer casing of the ignition coil is not limited to the case and the casting resin as described above, but the outer casing of the ignition coil may be formed by injection molding the mold part covering the coil assembly. Good.

In the above embodiment, the contact portion is formed on a part of the coil conductor which constitutes one turn on the winding start side of the final turn of the primary coil. It will be connected to the other end of the primary coil via a coil portion forming a part (the coil portion of the final layer). Therefore, as shown in FIG. 10, the end 4B on the winding start side of the secondary coil 4 is located a predetermined number of turns (the number of turns of the final layer) before the end 2B on the winding end side of the primary coil. Connected to the position. In this case, the potential of the end portion 4B on the winding start side of the secondary coil 4 and the potential of the end portion 2B on the winding start side of the primary coil 2 do not match, but there is no problem in practical use.

The number of turns of the final layer of the primary coil may be smaller than the number of turns of other layers (one turn or less than one turn may be sufficient).

The winding of the final layer is terminated on the other end side of the primary bobbin, and the coil conductor forming the final turn of the final layer is hooked on the conductor hooking portion, and then the coil conductor is connected to the primary coil. It may be guided to the primary terminal 108 side through the outer circumference of the coil (without winding the coil).

In the above embodiment, one end 4A and the other end 4B of the secondary coil 4 are wound around and connected to the high voltage side relay terminal metal fitting 7 and the low voltage side relay terminal metal fitting 8, respectively.
It is not necessary to remove the insulating coating on both ends of the secondary coil 4,
Simply connect the coil conductor (usually enameled wire) to the relay terminal fitting 7
It suffices that it be tightly wound around and 8 and wrapped. When the one end 4A and the other end 4B of the secondary coil are wound around and connected to the high voltage side relay terminal fitting 7 and the low voltage side relay terminal fitting 8 respectively without removing the insulating coatings on both ends of the secondary coil 4,
Initially, one end and the other end of the secondary coil are in contact with the high-voltage side and low-voltage side relay terminal fittings through the insulating coatings of the coil conductors respectively. When an ignition plug is connected to the secondary coil 4 and the ignition operation is performed once, spark discharge is also generated between both ends of the secondary coil and the relay terminal fittings 7 and 8, and the insulating coatings on both ends of the secondary coil are formed. Be broken. Once the ignition operation is performed and the insulation coating is broken, thereafter, the secondary coil and the relay terminal fitting 7
There is no problem in practical use because electrical continuity is established between and.

As described above, when one end and the other end of the secondary coil are wound around and connected to the relay terminal fittings 7 and 8 respectively without removing the insulating coating of the coil conductor, the coil conductors are used as the relay terminal fittings 7 and 8. If a coiled wire with a sharp edge is used, the insulating coating of the coil conductor is broken when the coil conductor is wound around the relay terminal metal fitting, and the core wire of the coil conductor directly contacts the relay terminal metal fitting. Can obtain a preferable contact state.

Therefore, in the above embodiment, the low-voltage side relay terminal metal fitting 8 is formed by punching. Since the terminal metal fitting 8 formed by punching out the metal plate has sharp edge portions at the corners, even by simply winding the coil conductor around the low-voltage side relay terminal metal fitting 8, electrical connection between the two can be achieved. Can be good.
Further, it is preferable that the high-voltage side relay terminal metal fitting 7 also has a sharp edge formed in a portion around which the coil conductor is wound.

FIGS. 7A and 7B show a modification of the high voltage side relay terminal fitting 7. This relay terminal fitting is
A plate-shaped portion 701 and a coil conductor winding portion 702 having a U-shaped cross-section, one end of which is connected near one end 701a of the plate-shaped portion, are integrally formed, and formed by bending a metal plate punched into a predetermined shape. It is a thing. Plate-shaped part 7
On the other end side of 01, a contact portion 701b is formed by bulging a part of the plate-shaped portion. This terminal fitting 7
In the case of using, the one end 701a of the plate-shaped portion 701 is inserted and fixed in the groove provided in one end of the secondary bobbin 3, and the contact portion 701b of the plate-shaped portion 701 is connected to the head 6a of the high-voltage output terminal 6.
Contact. The contact portion 701b may be omitted.

In the above embodiment, the high voltage cord connecting portion 10 is used.
4 is provided outside the outer peripheral portion of the secondary bobbin 3, the high-voltage cord connecting portion 104 is located laterally to one end of the secondary bobbin 3 in the axial direction, as shown in FIG. You may make it provide in the made state. In this case, for example, as shown in FIG. 9, a high voltage having a terminal metal fitting main body 710 having a substantially U-shaped cross section and a coil conductor winding portion 711 erected from one end side of the main body 710 in the width direction is integrally formed. By using the side relay terminal fitting 7, as shown in FIG. 8, the main body 710 of the terminal fitting 7 is fitted to and held by the flange portion 310 at one end of the secondary bobbin 3, and the flange portion 3 of the secondary bobbin 3 is held.
The end surface of the main body 710 along the outer end surface of the high voltage output terminal 6
Touch the head of.

With the structure shown in FIG. 8, the high-voltage cord connecting portion 104 does not largely project outward in the radial direction. Therefore, the bulging portion 501 of the case 5 is eliminated or the bulging portion has a protruding dimension. The size of the ignition coil can be reduced by shortening the outer diameter of the ignition coil.

In the embodiment shown in FIG. 8, after winding the terminal portion 4A of the secondary coil 4 around the coil conductor winding portion 711, the coil conductor winding portion 711 is bent and laid down toward the high-voltage cord connecting portion 104, and the primary coil is wound. Of the lead terminals 109 and 110 (lead terminal 110 is shown in FIG.
Not shown. ) Is bent so as to be tilted to either side, the bulging portion of the case 5 can be eliminated, or at least the protruding dimension thereof can be shortened to further reduce the size of the ignition coil.

In the above embodiment, one end 4A and the other end 4B of the secondary coil 4 are connected to the relay terminal fittings 7 and 8, respectively.
It is connected only by wrapping it around, but the insulating coating of the one end 4A and the other end 4B of the secondary coil is removed, and the one end 4A and the other end 4B are soldered to the relay terminal fittings 7 and 8, respectively. Good.

In the above embodiment, the high voltage output terminal 6
Although a wood screw-shaped one is used as this, the high-voltage output terminal is not limited to the wood-screw-shaped one as long as it can cut into the core wire of the high-voltage cord inserted in the high-voltage cord connecting portion 104 and cannot be removed. May be.

In the above embodiment, the contact portion 20 is formed by hooking a part of the coil conductor constituting one turn of the final layer of the primary coil to the conductor hooking portion and leading it to the outside.
However, it is also possible to fix the terminal metal fitting constituting the contact portion to the end portion of the primary bobbin and connect the coil conductor of the primary coil to the terminal metal fitting.

In the above embodiment, the conductor hooking portion is constructed by projecting the tip of the rib-like projection formed on the outer end surface of the collar portion at the other end of the primary bobbin from the outer periphery of the collar portion. As shown in FIG. 11, a pair of cutouts 120, 120 are formed on the outer peripheral portion of the collar portion at the other end of the primary bobbin 1, and the portion between these cutouts is formed on the conductor hooking portion 1.
It may be 12.

In the above embodiment, the pair of primary terminal fittings 107 and 10 are provided on the collar plate 102 provided at one end of the primary bobbin.
Although 8 is fixed and the end portion on the winding start side and the end portion on the winding end side of the primary coil are connected to these primary terminal fittings, a pair of primary terminal fittings is not necessarily connected to the primary bobbin. It is not necessary to attach it to the collar plate. For example, in the above embodiment, only one of the primary terminal fittings 107 is connected to the collar plate portion 102.
The other primary terminal fitting 108 may be attached to the collar portion 103 on the other end side of the primary bobbin or the collar portion on the other end side of the secondary bobbin. Primary terminal fitting 108
When the secondary bobbin is provided on the other end of the collar,
The next terminal metal fitting 108 may be formed integrally with a part of the low voltage side relay terminal metal fitting 8. Further, both the pair of primary terminal fittings may be provided on the side opposite to the collar plate portion 102 (the other end of the primary bobbin or the other end of the secondary bobbin).

[0046]

As described above, according to the present invention, the contact portion connected to the primary coil is provided at the end portion of the primary bobbin opposite to the collar plate portion, and one end and the other end of the secondary bobbin are provided. When the primary bobbin is inserted inside the secondary bobbin by providing the high voltage side relay terminal metal fitting and the low voltage side relay terminal metal fitting which are connected to one end and the other end of the secondary coil respectively, the high voltage output terminal and the contact portion are respectively high voltage. Since it is configured to contact the side relay terminal and the low voltage side relay terminal, the primary coil and the secondary coil can be individually wound and combined, respectively,
Electrical connection between one end of the secondary coil and the high voltage output terminal and between the other end of the secondary coil and the primary coil can be easily performed, and the manufacturing efficiency of the ignition coil can be improved. it can.

According to the second or third aspect of the present invention, a part of the coil conductor forming the primary coil is hooked on the conductor hooking portion provided on the outer peripheral portion of the primary bobbin, so that the coil conductor Since the contact portion is configured by removing the insulating coating of the portion along the outer surface of the conductor latching portion, the contact portion for contacting the low voltage side relay terminal is configured using the coil conductor itself of the primary coil. Therefore, there is an advantage that the connecting portion between the primary coil and the secondary coil can be configured without increasing the number of parts and without the trouble of connecting the terminal portion of the primary coil to the contact. .

[Brief description of drawings]

1 is a cross-sectional view showing an overall configuration of an embodiment of the present invention, which is a cross-sectional view taken along line AA of FIG.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3A is a front vertical cross-sectional view showing a primary bobbin used in an embodiment of the present invention and a primary coil wound around the primary bobbin. (B) is a right side view of (A).

FIG. 4 is a perspective view showing a contact state between a contact portion and a low-voltage side relay terminal fitting in the embodiment of the present invention.

FIG. 5A is a front vertical cross-sectional view showing a secondary bobbin used in an embodiment of the present invention and a secondary coil wound around the secondary bobbin. (B) is a left side view of (A).

FIG. 6 is a perspective view of a high voltage side relay terminal fitting used in an embodiment of the present invention.

7 (A) and 7 (B) are respectively a perspective view and a top view showing a modified example of the high-voltage side relay terminal fitting used in the embodiment of the present invention.

FIG. 8 is a vertical sectional view showing a main part of another embodiment of the present invention.

FIG. 9 is a perspective view showing an example of a high-voltage side relay terminal fitting used in the embodiment of FIG.

FIG. 10 is a circuit diagram showing an equivalent circuit of an ignition coil according to an embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a modified example of the conductor hooking portion used in the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Primary bobbin 101 Body part 102 Collar plate part 103 Collar part 104 High voltage cord connection part 107 Primary terminal 108 Primary terminal 2 Primary coil 2A One end of primary coil 2B One end of secondary coil 201 Contact part 3 Secondary bobbin 4 Secondary coil 4A One end of the secondary coil 4B The other end of the secondary coil 5 Case 6 High voltage terminal. 7 Low voltage side relay terminal metal fittings 8 High voltage side relay terminal metal fittings

[Procedure amendment]

[Submission date] October 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

At one end of the secondary bobbin 3, there is also a mushroom-shaped locking projection 30 having a positioning projection 305 protruding in the axial direction and an elastically deformable enlarged head 306a at the tip.
6 is a positioning hole 114 for the primary bobbin and a lock, respectively.
It is provided so as to correspond to the hole 115 .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

3 (A) is a positive side longitudinal sectional view showing a primary coil wound on the primary bobbin and the primary bobbin used in the embodiment of the present invention. (B) is a right side view of (A).

Claims (3)

[Claims] 1. A primary bobbin having, at one end, a collar plate portion having a high-voltage cord connecting portion to which a high-voltage output terminal is attached,
A primary coil wound around the primary bobbin, a secondary bobbin, and a secondary coil wound around the secondary bobbin are provided, and one end of the secondary coil is electrically connected to the high-voltage output terminal. In the connected ignition coil for an internal combustion engine, a contact portion that is directly connected to a terminal portion of the primary coil or via a coil portion that forms a part of the primary coil is provided on the other end side of the primary bobbin. A high voltage side relay terminal metal fitting is attached to one end of the secondary bobbin, one end of the secondary coil is connected to the high voltage side relay terminal metal fitting, and a low voltage side relay terminal metal fitting is attached to the other end of the secondary bobbin. The other end of the secondary coil is connected to the low-voltage side relay terminal fitting, and the primary bobbin is inserted inside the secondary bobbin,
An ignition coil for an internal combustion engine, wherein the high-voltage output terminal and the contact portion are brought into contact with the high-voltage side relay terminal fitting and the low-voltage side relay terminal fitting, respectively. 2. A conductor hooking portion is provided on an outer peripheral portion of the other end of the primary bobbin, and a part of a coil conductor forming the primary coil is hooked on the conductor hooking portion, The insulating coating of a portion of the coil conductor hooked on the stopper portion along the outer surface of the conductor latching stopper portion is removed, and the portion where the insulating coating is removed serves as the contact portion. An ignition coil for an internal combustion engine according to 1. 3. A primary bobbin having a collar plate portion having a high-voltage cord connecting portion to which a high-voltage output terminal is attached at one end and a conductor hooking portion at the other end. The next coil is wound, and when the final layer of the primary coil is wound, a part of the coil conductor constituting one turn of the final layer is hooked on the conductor retaining portion and then the final layer is wound. Primary coil winding step, and removing the insulating coating on the portion of the coil conductor forming one turn of the final layer of the primary coil along the outer surface of the conductor latching portion, and removing the insulating coating And a contact bobbin having a high-voltage side relay terminal metal fitting at one end and a low-voltage side relay terminal metal fitting at the other end, one end of which is connected to the high-voltage side relay terminal metal fitting. , The other end is the low-voltage side relay terminal fitting 2 for winding the connected secondary coil to the secondary bobbin
Next coil winding step, and coil assembly step of inserting the primary bobbin inside the secondary bobbin and bringing the high-voltage output terminal and the contact portion into contact with the high-voltage side relay terminal fitting and the low-voltage side relay terminal fitting, respectively. A method for manufacturing an ignition coil for an internal combustion engine, comprising: