JPH09106923A - Ignition coil for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignition coil for an internal combustion engine facilitating assembling and wiring by integrally forming a pair of ignition coils in a simultaneous ignition mode with a pair of igniters. SOLUTION: A pair of igniters 8A, 8B and a pair of ignition coils 1A, 1B are contained in a case 30 to be connected to respective power supplies, besides, a grounding connector is provided. This connector is provided with the first and second connector terminals 61, 62 transmitting ignition signals to the igniters 8A, 8B, the third connector terminal 63 connecting a pair of primary coils 11 and another pair of igniters 8A, 8B to respective power supplies as well as the fourth connector terminal 64 grounding the pair of respective igniters 8A, 8B while these connector terminals are jointly provided in the case 30. In such a constitution, a communicating hole is formed in the connector terminals which are junctioned with one another without fail by inserting the front ends of the igniter terminals bent in L-shape into the communicating hole to be soldered.

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 more particularly to a simultaneous ignition type ignition coil for an internal combustion engine that ignites two cylinders with one ignition coil.

[0002]

2. Description of the Related Art There are various known ignition systems for internal combustion engines. Among them, in a simultaneous ignition system (also called a double ignition system) ignition coil, one cylinder is in a compression process. The two cylinders are selected so that the other cylinder is in the exhaust process, and the output high voltage is simultaneously applied to these cylinders. For example, regarding a four-cylinder internal combustion engine, the first cylinder and the fourth cylinder
In the case where the cylinders are ignited at the same time and the second cylinder and the third cylinder are ignited at the same time, for example, when the first cylinder is in the compression process, the pressure inside the cylinder is large, and therefore the high voltage does not easily discharge, Since the fourth cylinder is in the exhaust process and the pressure inside the cylinder is close to the atmospheric pressure, it easily discharges at a low voltage, and the resistance of the spark plug becomes a negligible value. Therefore, when the ignition plugs of the first cylinder and the fourth cylinder are connected in series,
The ignition plug of the fourth cylinder in the exhaust process has almost no resistance, and almost all output high voltage is applied to the first cylinder in the compression process. Therefore, it is similar to the case where a high voltage is individually applied to each spark plug by the ignition coil.

An ignition coil that realizes the simultaneous ignition method as described above is disclosed, for example, in Japanese Patent Laid-Open No. 4-226007. According to the invention proposed in the publication, plural sets of second laminated cores, primary coils, and secondary coils are housed in a single container-shaped resin housing in which plural sets of first laminated cores are embedded. Therefore, the number of man-hours and space for assembling the ignition coil to the engine and the vehicle body can be reduced. Specifically, two sets of ignition coils, each having a C-shaped laminated core and an I-shaped laminated core and having a coil wound around the latter, are arranged in parallel, and are clearly shown in FIG. 4 of the publication. As described above, the pair of I-shaped laminated cores located at the axial center of each coil are arranged in parallel.

On the other hand, in Japanese Patent Laid-Open No. 6-77066,
A primary bobbin with a built-in core and at least a primary coil and a primary bobbin connected to the primary bobbin for the purpose of easily and properly accommodating the core and coil in a case with a small number of parts. A primary coil assembly is formed by integrally forming a connecting portion provided with a primary terminal for connecting a coil winding and a connector portion provided with a connector terminal connected to this connecting portion and connected to at least the primary terminal. However, there is disclosed an ignition coil for an internal combustion engine in which this primary coil assembly is arranged in a case.

Further, Japanese Utility Model Publication No. 6-27939 discloses that
There has been proposed an ignition coil for an internal combustion engine in which a primary coil and a secondary coil are fixed in a coil housing portion by an insulating resin layer and a switching module is fixed in an auxiliary housing portion. Further, in JP-A-6-66239, a power switch and an ignition coil are assembled, then the power switch and the ignition coil are wire-connected to form an assembly, and then the entire assembly is made of an insulating resin. There has been proposed a method of manufacturing an ignition device for an internal combustion engine, which is transfer molded by using the ignition device.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the two sets of ignition coils in which two cores are arranged in parallel as described in Japanese Patent Publication No. 6007, the core structure is restricted and it is difficult to reduce the size. Further, the wiring between the primary coils wound around each core is complicated, and even if they are separately wired to avoid this, processing of the lead wires outside the device poses a problem. In particular, in the ignition coil described in the publication, since the primary coil and the secondary coil are respectively assembled to the two sets of ignition coils arranged in parallel, not only the number of parts is large, but also the assembling work is not required. It is complicated, wiring work is difficult, and workability is low. On the other hand, if the primary coil assembly could be constructed as described in Japanese Patent Application Laid-Open No. 6-77066 (although it is extremely difficult), at least two sets of ignition coils would not be easily assembled. Although good, the entire internal combustion engine ignition coil still has problems in assembly work and wiring work.

On the other hand, Japanese Utility Model Publication No. 6-27939 discloses an ignition coil incorporating a switching module. As an example thereof, a switching element chip is directly soldered to a metal case to reduce thermal resistance. Although such a technique is disclosed, it does not integrate a plurality of ignition coils and does not facilitate wiring work. Japanese Laid-Open Patent Publication No. 6-66239 also relates to a wiring technique for one power switch and an ignition coil, and does not relate to the integration of a plurality of ignition coils or the simplification of wiring at that time.

Accordingly, the present invention provides an ignition coil for an internal combustion engine which integrally houses a pair of ignition coils and a pair of igniters for use in a simultaneous ignition type ignition coil for an internal combustion engine, and which is easy to assemble and wire. With the goal.

[0009]

In order to achieve the above object, the present invention provides an ignition system in which at least a pair of ignition coils wound with a primary coil and a secondary coil are connected to both ends of each of the primary coils. A connector for accommodating at least a pair of igniters for controlling energization to the pair of ignition coils in response to a signal and for connecting the pair of igniters and the pair of ignition coils to a power source and grounding the connector, respectively. In an internal combustion engine ignition coil formed integrally with a case, the connector includes first and second connector terminals that supply an ignition signal to the pair of igniters, the pair of primary coils and the pair of igniters. A third connector terminal connected to the power supply,
A fourth connector terminal for grounding each of the pair of igniters is provided, and the first to fourth connector terminals are arranged side by side in the case. Thus, all connector terminals connected to the pair of igniters are housed in the case, and since the connector terminals for power supply and ground are shared, the number of parts is small and the assembly and wiring Is easy.

In the ignition coil for an internal combustion engine according to a second aspect of the present invention, at least one of the first to fourth connector terminals has a communication hole and at least one pair of igniters is provided. It is preferable that one of them has an igniter terminal bent in an L shape, and the tip of the igniter terminal is inserted into the communication hole to be joined to the connector terminal. With this configuration, both terminals can be joined when the primary coil or the like is assembled,
Wiring is easy.

In the internal combustion engine ignition coil, as described in claim 3, solder may be applied to a joint portion between the communication hole of the connector terminal and the igniter terminal. With this configuration, the joint can be visually checked, and the solder joint can be easily performed.
Since the solder is solidified around the communication hole, both terminals are securely joined.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an ignition coil for an internal combustion engine of the present invention will be described below with reference to the drawings. 1 to 5 show the overall configuration of an embodiment of an ignition coil for an internal combustion engine of the present invention, and FIGS. 6 to 10 show each part in an enlarged manner. As shown in FIG. Coil 1
A and 1B are integrally arranged side by side. Since both have the same structure, the same reference numerals are given to the same parts and portions, and in the following description, only one of them will be mainly described. The ignition coil 1 for an internal combustion engine of the present embodiment has two parts of the E-shaped core 3 shown in FIG. 4, as shown in the enlarged cross section of the one ignition coil 1B side in FIG. A pair of columnar cores 2 are arranged on the same axis in one opening. Each core 2 is built in the primary coil assembly 10, and the secondary coil assembly 2
When two sets of 0s are assembled and housed in the case 30 together with the pair of igniters 8A and 8B, the structure shown in FIG. 1 is obtained.

The case 30 is a housing made of synthetic resin, and two recesses 33A and 33B (shown in FIG. 13) are formed substantially in the center thereof, and the primary coil assembly 1 is formed in each of the recesses 33A and 33B.
0 and a secondary coil assembly 20 are housed. Four high voltage connector parts 31 are provided on one side of the side wall of the case 30.
a to 31d are juxtaposed in parallel with each other on the same plane, and the high-voltage terminal 7 is housed in each. Case 3
A pair of igniters 8A and 8B are mounted on the side wall of the No. 0 high-voltage connector section 31a to 31d on the opposite side. This controls the primary current of the primary coil and is also called an ignition module.

On the other hand, the core 3 constituting the outer core is mounted parallel to the bottom surface of the case 30 as shown in FIGS. 2 to 4, and is exposed without being covered with the resin material of the case 30. That is, the case 30 has a shape in which two containers are joined together, and as shown in FIG. 4, the leg portion 3c at the center of the core 3 is provided in the recess 32 formed on the bottom surface side between the two containers.
And the inner side surfaces of the leg portions 3a and 3b are in close contact with both outer side surfaces. As described above, the core 3 is an E-shaped iron core and is formed by laminating a plurality of non-oriented silicon steel sheets, but a grain-oriented silicon steel sheet may be used. Alternatively, a U-shaped outer core may be formed for each ignition coil 1A, 1B and the two may be joined together. Thus, as shown in FIG. 6, a side wall of the case 30 is interposed between the core 2 and the core 3 at a portion where the core 2 and the core 3 face each other.
That is, the outer peripheral wall 33 and the partition wall 3 are provided between the core 2 and the core 3.
4 are present, and these form an air gap.

On the other hand, as shown in FIG. 6, the core 2 forming the inner core and forming the magnetic circuit together with the core 3 has a pillar shape in which both ends of the main body portion 2a are widened to form extension portions 2b and 2c. The core 2 has a fixing hole (reference numeral omitted) formed in the extending portion 2b. The core 2 of the present embodiment is formed by laminating a plurality of grain-oriented silicon steel plates whose rolling direction is the axial direction of the main body 2a.

As shown in FIG. 1, the pair of primary coil assemblies 10 are formed substantially symmetrically, and each primary bobbin 11 has the core 2 having the above-mentioned structure built therein by insert resin molding. Primary coil 1 of primary bobbin 11
2 is a main body 2a of the core 2 shown in FIG.
The collar portions 11a and 11b are formed around each other and are separated from each other by a predetermined distance. Then, the collar portions 11a and 11b
In the meantime, the windings of the primary coil 12 are wound in two or four layers. Further, as shown in FIG. 1 and FIG. 7 in which a part thereof is enlarged, and FIG. 10, a protrusion for guiding and supporting the winding of the primary coil 12 on the side where the pair of primary bobbins 11 and 11 face each other. 14 and 15 are erected.

Further, as shown in FIG. 7, first to fourth connector terminals 61 to 64 are arranged side by side in the case 30, and respective base ends thereof are arranged in parallel. The ends 12a and 12b at the beginning of winding are the igniter terminal 8A.
5, 8B5 electrically connected to the end 12c of the end of winding,
12d is electrically connected to the third connector terminal 63. Incidentally, these connection structures will be described later.

On the other hand, as shown in FIG. 1, the left and right primary coil assemblies 10 have secondary coil assemblies 2 of the same shape.
0 is attached. Each of these is formed by winding a secondary coil 22 around a secondary bobbin 21. As shown in FIG. 6, the secondary bobbin 21 has a plurality of collar portions 21 at predetermined intervals in the axial direction.
6 is a resin cylindrical body having a substantially rectangular cross section in which a is formed, and a plurality of grooves 21b are formed between these flange portions 21a, and the windings of the secondary coil 22 are shown in FIG. It is wound from left to right. Both ends of the secondary bobbin 21 are wide collar portions 21c and 21d.
Secondary terminals 23 shown in FIGS. 1 and 6 are fitted in grooves (not shown) formed in c and 21d, respectively.

Each secondary terminal 23 has a secondary coil 22.
The winding start or winding end of the winding is wound and connected by solder or the like. Therefore, both ends of the secondary coil 22 are electrically connected to the secondary terminals 23, respectively. In addition, each secondary terminal 23 extends in a direction orthogonal to the axis of the secondary bobbin 21, and when the secondary terminal 23 is later assembled in the case 30, the secondary terminal 23 is inserted into the high voltage terminal 7, and Are electrically connected. That is,
A secondary coil assembly 20 is mounted on the primary coil assembly 10 to form a subassembly. The subassembly is housed in a case 30 as shown in FIG. 6, and each secondary terminal 23 is inserted into each high voltage terminal 7. (Only one side appears in FIG. 6).

As shown in FIG. 1, a pair of igniters 8A and 8B are mounted on the side wall of the case 30 opposite to the high voltage terminals 31a to 31d at a position close to the two ignition coils 1A and 1B. There is. Case 3 as described above
0 has recesses 30A and 30B formed therein, and igniters 8A and 8B are housed therein, respectively, but the igniters 8A and 8B may be integrally provided when the case 30 is molded. These igniters 8A and 8B include
An igniter terminal 8A connected to the igniters 8A and 8B, for example, accommodates a circuit element (which will be described later) indicated by a chain line in FIG. 11 in a part thereof.
1 to 8A5 and 8B2 to 8B5 are bent and formed to extend above the case 30 as shown in FIGS. 1, 7, 8 and 10.

Further, as shown in FIGS. 10 and 14, the case 30 is provided with a connector portion 36, and the tip portions of the first to fourth connector terminals 61 to 64 are shown in FIG. Are arranged in a row. As shown in FIG. 7, at the base end side of these connector terminals, the igniter terminal 8A1 is joined to the first connector terminal 61, and the igniter terminal 8B2 is joined to the second connector terminal 62 in the same manner.
To the connector terminal 63 of the igniter terminal 8A
3,8B3 are joined. The joining structure will be described later together with the assembling procedure.

As described above, the primary and secondary coil assemblies 10 and 20 are integrally housed in the case 30, and the electrical connection between the primary coil 12 and the igniters 8A and 8B is the first to the first. Wiring is easy because it is performed via the four connector terminals 61 to 64. That is, since the first to fourth connector terminals 61 to 64 are provided, connection to the igniter terminal 8A1 and the like is easy, and in particular, one primary coil 12 for each primary coil 12 of the ignition coils 1A, 1B is provided. It is possible to electrically connect to both of the igniter terminals 8A3 and 8B3 by means of the connector terminal 63 of No. 3, and similarly to the one of the fourth terminal.
Since the connector terminal 64 can be electrically connected to both the igniter terminals 8A4 and 8B4, not only the number of parts can be reduced by commonization, but also the wiring is easy and good assembling workability can be obtained. . Moreover, as will be described later, the joining structure is easy and reliable.

After wiring as described above, the space in the case 30 is filled with a thermosetting synthetic resin, for example, an epoxy resin, and cured to form a resin portion 9 as shown by the dotted lines in FIG. . As a result, the primary coil 12 and the secondary coil 22 are impregnated and fixed, the electrical connection between the primary coil 12 and the igniters 8A and 8B is appropriately insulated, and the secondary coil 22 withstands the high output voltage. The obtained insulation is secured. Thus, as shown in FIG. 1, a single internal combustion engine ignition coil 1 having two sets of ignition coils 1A and 1B is formed in the case 30.

FIG. 11 shows an essential part of an ignition circuit for a four-cylinder internal combustion engine according to this embodiment. The internal combustion engine ignition coil 1 is mounted on an internal combustion engine (not shown), and has a high-voltage connector section. 31a to 31d are connected to the spark plugs 81 to 84 via high tension cords (not shown). That is, the ignition plug 81 attached to the first cylinder, the ignition plug 84 attached to the fourth cylinder, and the ignition plug 82 attached to the second cylinder are connected to the high-voltage connector portions 31a and 31b of the ignition coil 1A. , The ignition plug 83 attached to the third cylinder is the high voltage connector portion 31 of the ignition coil 1B.
c, 31d.

The igniters 8A and 8B are connected to the electronic control unit ECU and the power source BT through the first to fourth connector terminals 61 to 64, respectively, and
Grounded. The electronic control unit ECU supplies an ignition signal to the igniters 8A and 8B, and the configuration thereof is the same as a general one, so that the description thereof will be omitted. When the switching transistors Tr1 and Tr2 in the igniters 8A and 8B interrupt the primary current supplied from the power source BT to each primary coil 12, a counter electromotive force is induced in each secondary coil 22. A high voltage of 40 kv is generated. This high voltage is output to the spark plugs 81 to 84 via the secondary terminal 23 and the high voltage terminal 7 of FIG. Thus, according to the present embodiment, six connector terminals 61 to 66 are required in the conventional apparatus in which the two sets of ignition coils 1x and 1y shown in FIG. 12 are arranged in parallel. The first to fourth connector terminals 61 to 64 are formed, and the two connector terminals are omitted.

Ignition coil 1 for internal combustion engine having the above structure
In the above, the ignition plug 81 of the first cylinder and the ignition plug 84 of the fourth cylinder are ignited at the same time, and the ignition plug 82 of the second cylinder and the ignition plug 83 of the third cylinder are ignited at the same time.
For example, when the first cylinder is in the compression process, the internal pressure of the cylinder is large, so the spark plug 81 does not easily discharge even at a high voltage, but the fourth cylinder is in the exhaust process and the internal pressure of the cylinder becomes atmospheric pressure. Because it is close, it easily discharges at a low voltage, and spark plug
The resistance of No. 4 becomes a negligible value, and almost all the output high voltage is applied to the ignition plug 81 of the first cylinder in the compression process. Thus, a high voltage is individually applied to the ignition plugs 81 to 84 by the ignition coils 1A and 1B, a spark discharge is generated in each electrode portion, and a compressed air-fuel mixture in each combustion chamber (not shown) is generated. Is ignited.

FIGS. 13 to 17 show the respective parts of the ignition coil 1 for the internal combustion engine in accordance with the assembling procedure. First, as shown in FIGS. 13 and 14, the case 30 has an outer peripheral wall 33 on the entire circumference. Has been formed. On the bottom side of the case 30,
A partition 34 is formed in the central portion so that the recess 32 shown in FIG. 4 is formed, and two recesses 33 are formed on the surface side thereof.
A, 33B are formed. A plurality of guide grooves (representatively indicated by 34a) are formed on the surface of the partition wall 34.
Further, a partition wall 35 is formed, and recesses 30A and 30B for accommodating the igniters 8A and 8B are formed.
The latter is formed deeper, so that a step is formed between the two as shown in FIG. Further, the recess 30
A plurality of partition walls 37 are erected between A and 30B.

For the above case 30, the igniter 8
A and 8B are housed in the recesses 30A and 30B, respectively, and the igniter terminals 8A1 and 8B2 are arranged between the adjacent partition walls 37, respectively. The connector terminals 61 to 64 are press-fitted into the plurality of communication holes (represented by 361 in FIG. 14 as a representative) of the connector 36, and the communication holes 61a to 64 of the connector terminals 61 to 64 are also inserted.
In a, igniter terminals 8A1, 8B2, 8 respectively
The tips of A3 and 8B3, 8A4 and 8B4 are press-fitted. After this, the areas around the communication holes 61a to 64a are soldered. At this time, the soldering work can be performed while visually checking the joint portion. Thus, the communication hole 61
Since the terminals are securely joined around a to 64a and the joints are partitioned by the partition wall 37, the solder does not flow out to other portions.

Next, as shown in FIG. 15, the primary bobbin 11 is integrally formed on the core 2, the wiring supporting portion 13 is formed at this time, and the projections 14 and 15 are integrally formed on this. Further, the above-mentioned secondary coil assembly 20 is formed. Then, after the primary coil 12 is wound around the primary bobbin 11, it is inserted into the hollow portion of the secondary bobbin 21. In this state, the pair of the primary coil assembly 10 and the secondary coil assembly 20 are respectively inserted into the recesses 33A and 33A of the case 30.
It is housed in B. At this time, the high voltage terminal 7 is inserted into and electrically connected to the high voltage connector portions 31a to 31d. Thus, as shown in FIG. 16, the high voltage terminal 7
The secondary terminal 23 is fitted and electrically connected to the recess of the primary coil assembly 10 and the secondary coil assembly 20 is held in the case 30.

After this, as shown in FIGS. 7 and 8, the ends 12a, 12b of the windings of the primary coil 12 are led out through the projections 15 and the guide grooves 34a, and the tips of the igniter terminals 8A5, 8B5, respectively. After being wound, it is soldered. On the other hand, the end portions 12c and 12d are led out through the protrusion 14 and the guide groove 34a in the central portion, fitted into the groove at the tip portion of the connector terminal 63, and then soldered.
Then, the case 30 is filled with synthetic resin, and the resin portion 9
(FIG. 1) is formed.

FIG. 17 shows a core 3 which constitutes an E-shaped outer core.
However, the legs 3a and 3b on both sides are the case 3
It is attached so that it contacts the outer side surface of 0 and the central leg portion 3c is housed in the concave portion 32. At this time, the hole 3e of the core 3 is fitted into the protrusion 34b (shown in FIGS. 5, 10, and 14) of the case 30, and the holes 3d and 3f on both sides are also fitted into the protrusion (not shown) of the case 30. Therefore, it is placed at a predetermined position. In other words, as shown in FIGS. 1 to 3, the two concave portions between the leg portions 3a and 3b on both sides and the central leg portion 3c accommodate the portions forming the concave portions 33A and 33B of the case 30, respectively. It will be in the state of being. Then, the tips of the protrusions 34b and the like are heated and caulked by heat. The core 3 is previously shown in FIG.
Each component may be incorporated after being mounted in the case 30 of No. 3. Thus, according to the ignition coil for the internal combustion engine of the present embodiment, the assembling work and the wiring work can be easily performed.

[0032]

Since the present invention is configured as described above, the following effects can be obtained. That is, in the ignition coil for an internal combustion engine of the present invention, first and second connector terminals for supplying an ignition signal to the pair of igniters,
A third connector terminal for connecting the pair of primary coils and the pair of igniters to a power source and a fourth connector terminal for grounding each of the pair of igniters are provided, and the first to fourth connector terminals are arranged side by side in the case. Therefore, the number of parts is small, the assembling and wiring are easy, and the size and cost can be reduced.

In the ignition coil for an internal combustion engine according to a second aspect of the present invention, in addition to the above, at least one connector terminal has a communication hole, and at least one of the pair of igniters has an L-shaped bent igniter. Since the terminal has a terminal and the tip of the igniter terminal is inserted into the communication hole to be joined to the connector terminal, wiring is further facilitated.

Further, in the ignition coil for an internal combustion engine according to the third aspect of the invention, since the joint portion between the communication hole of the connector terminal and the igniter terminal is soldered, the solder joint is easy and reliable. Can be joined to.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of an internal combustion engine ignition coil according to an embodiment of the present invention.

FIG. 2 is a front view of an internal combustion engine ignition coil according to an embodiment of the present invention.

FIG. 3 is a rear view of the internal combustion engine ignition coil according to the embodiment of the present invention.

FIG. 4 is a bottom view of the internal combustion engine ignition coil according to the embodiment of the present invention.

FIG. 5 is a side view of an internal combustion engine ignition coil according to an embodiment of the present invention.

FIG. 6 is a partially enlarged sectional view of an ignition coil for an internal combustion engine according to an embodiment of the present invention.

FIG. 7 is a partially enlarged plan view of an internal combustion engine ignition coil according to an embodiment of the present invention.

8 is a partially enlarged cross-sectional view of an internal combustion engine ignition coil according to an embodiment of the present invention, which is a cross-sectional view taken along the line AA of FIG. 7.

FIG. 9 is a partially enlarged sectional view of an ignition coil for an internal combustion engine according to an embodiment of the present invention.

10 is an enlarged cross-sectional view of an internal combustion engine ignition coil according to an embodiment of the present invention, and is a cross-sectional view taken along line BB of FIG. 7.

FIG. 11 is an electric circuit diagram showing a main part of an ignition coil for an internal combustion engine according to an embodiment of the present invention.

FIG. 12 is an electric circuit diagram showing a main part of a conventional ignition coil for an internal combustion engine.

FIG. 13 is a plan view of a case according to an embodiment of the present invention.

FIG. 14 is a sectional view showing an assembled state of the igniter and the connector terminal in the case according to the embodiment of the present invention.

FIG. 15 is a plan view showing an assembled state of the primary coil assembly and the secondary coil assembly and the high-voltage terminal to the case according to the embodiment of the present invention.

FIG. 16 is a partial cross-sectional plan view showing a state where each component is housed in a case according to the embodiment of the present invention.

FIG. 17 is a plan view of an outer core used in an embodiment of the present invention.

[Explanation of symbols]

1A, 1B Ignition coil 2 cores, 2a body part, 2b, 2c extension part 3 cores 7 high-voltage terminals 8A, 8B igniter 8A1, 8A3, 8A4, 8A5 igniter terminal 8B2, 8B3, 8B4, 8B5 igniter terminal 9 resin part 10 primary Coil assembly 11 Primary bobbin, 11a, 11b Collar part 12 Primary coil 13 Wiring support part, 14 Protrusion, 15 Protrusion 20 Secondary coil assembly 21 Secondary bobbin, 21a Collar part, 21b Groove 22 Secondary coil 23 Secondary terminal 30 Case 30A, 30B Recesses 31a-31d High-voltage connector part 32 Recesses 33 Outer peripheral wall 33A, 33B Recesses 34 Partition wall 61 First connector terminal 62 Second connector terminal 63 Third connector terminal 64 Fourth connector terminal

Claims (3)

[Claims] 1. A primary coil and a secondary coil are wound around at least a pair of ignition coils, and both ends of each of said primary coils are connected to each other to control energization to said pair of ignition coils according to an ignition signal. An ignition coil for an internal combustion engine in which a pair of igniters are housed in a case, and a connector that connects the pair of igniters and the pair of ignition coils to a power source and is grounded is an ignition coil for an internal combustion engine that is integrally formed with the case. A first and second connector terminals for supplying an ignition signal to the pair of igniters, and a third connector terminal for connecting the pair of primary coils and the pair of igniters to the power supply,
An ignition coil for an internal combustion engine, comprising a fourth connector terminal for grounding each of the pair of igniters, wherein the first to fourth connector terminals are arranged side by side in the case. 2. At least one of the first to fourth connector terminals has a communication hole, and at least one of the pair of igniters is L.
2. The ignition coil for an internal combustion engine according to claim 1, further comprising an igniter terminal bent in a letter shape, the tip of the igniter terminal being inserted into the communication hole and joined to the connector terminal. 3. The ignition coil for an internal combustion engine according to claim 2, wherein solder is applied to a joint between the communication hole of the connector terminal and the igniter terminal.