JP2012174829A - Ignition coil for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignition coil which can be easily assembled in a compact configuration by making electric connection from a secondary coil to a high-voltage terminal without using welding nor soldering.SOLUTION: A substantially conic hollow part is formed in a part of a surface of the high-voltage terminal, installed in a case, which faces the case inside, one place of one end of a secondary high-voltage terminal comes into contact with the hollow part to be electrically connected. The secondary high-voltage terminal has elastic force by obliquely sloping a tip of the one end thereof. Further, the tip of the one end of the secondary high-voltage terminal is arranged within a range of the hollow part of the high-voltage terminal in a radial direction L. The angle of contact between the tip of the one end of the secondary high-voltage terminal and the hollow part of the high-voltage terminal is set to an angle which is acuter than 90° to the slope. In this configuration, a shift of the one end of the secondary high-voltage terminal is guided to a bottom part of the hollow part even if caused.

Description

The present invention relates to an ignition coil for an internal combustion engine.

Conventionally, an ignition coil for an internal combustion engine in which a case is provided with a primary coil, a secondary coil, and an iron core in a case, and a coil housing portion filled with a mold resin in the case is disposed outside the plug hole. Several configurations have been proposed for the purpose of making an electrical connection from a secondary coil for supplying a high voltage to the spark plug to the spark plug without using welding or soldering. As a typical example of this, for example, Japanese Patent Application Laid-Open No. 2004-207582 (hereinafter “Patent Document 1”) is known.

FIG. 10 is a side sectional view of the ignition coil described in Patent Document 1. In FIG. 10, an ignition coil 211 for an internal combustion engine includes a coil-iron core assembly 212, an insulating case 222 that accommodates the coil-iron core assembly 212, and a plurality of primary parts provided in a socket portion 222 s of the insulating case 222. Insulation for fixing the terminal-223, the high-voltage terminal 224 provided in the high-voltage tower portion 222h of the insulating case 222, and the coil-iron assembly 212, which is filled in the insulating case 222 and hardened, and is accommodated in the insulating case 222 And resin 225.

The coil-iron core assembly 212 includes a primary coil bobbin 213, a primary coil 214 wound around the primary coil bobbin 213 and having both ends connected to separate primary terminals 223, and the primary coil bobbin 213 and the primary coil 214. A secondary coil bobbin 215 located outside, a secondary coil 216 wound around the secondary coil bobbin 215 concentrically with the primary coil 214, and one end (low voltage end) connected to the primary terminal 223, for example, Connected to the other end (high voltage end) of the secondary coil 216 and attached to the secondary coil bobbin 215, and the connection pin 217 whose tip contacts the high voltage terminal 224, the primary coil 214 and the secondary coil 216, The point comprised by the iron core part 218 which magnetically connects the primary coil 214 and the secondary coil 216 Coil has been proposed.

JP 2004-207582 A

However, the conventional ignition coil has the following problems. That is, in the ignition coil of Patent Document 1, the high-voltage terminal has a substantially cylindrical shape, and the connection pin is always connected to the curved portion of the high-voltage terminal. Problems arise.

The present invention has been made in view of the above problems, and is highly reliable that electrical connection from a secondary coil to a high-voltage terminal can be performed without using welding or soldering, and even a small ignition coil can be easily assembled. The goal is to provide an ignition coil.

In order to solve the above problems, the present invention is configured as follows. That is, in the first aspect of the present invention, a case and at least a part of an iron core composed of a central iron core and an outer peripheral iron core are accommodated in the case, and a primary winding is provided on the primary bobbin in the case. A wound primary coil and a secondary coil having a secondary winding wound around a secondary bobbin are accommodated, and a high voltage terminal for supplying a high voltage to the spark plug is provided in the case. An ignition coil for an internal combustion engine in which a coil housing is filled with a mold resin, wherein a secondary high voltage terminal provided in the secondary coil is formed with a recess in at least a part of a surface of the high voltage terminal facing the inside of the case. Is an ignition coil for an internal combustion engine, which is in contact with at least one of the dents.

In the above configuration, the secondary high-voltage terminal may have an elastic force, the dent may be formed in a substantially conical shape, and the contact point between the secondary high-voltage terminal and the high-voltage terminal is the You may arrange | position within the prescribed | regulated range from the center axis | shaft of the said dent part of a high voltage terminal to the extraction side of the said secondary high voltage terminal. Moreover, a bending part may be formed in at least one place of the said secondary high voltage terminal, and the said secondary high voltage terminal may contact the said high voltage terminal 2 or more places. Further, the secondary high voltage terminal may be bent into a V shape, and the secondary high voltage terminal may be in contact with the high voltage terminal at two locations.

The secondary high voltage terminal may be bent in an N shape, and the secondary high voltage terminal may be in contact with the high voltage terminal at two locations. Further, a resin inflow portion is formed on at least a part of the flange formed on the primary bobbin, and at least one protrusion is formed on the axial extension of the flange formed on the secondary bobbin. The primary coil may be fixed, or a concavo-convex pattern may be formed around at least one of the secondary high voltage terminal, the primary bobbin, and the secondary bobbin.

As another invention, a case and at least a part of an iron core comprising a central iron core and an outer peripheral iron core are accommodated in the case, and a primary winding is wound around a primary bobbin in the case. The primary coil and the secondary coil in which the secondary winding is wound around the secondary bobbin are accommodated, and the case is provided with a high voltage terminal for supplying a high voltage to the spark plug, and the coil is accommodated in the case In an ignition coil for an internal combustion engine in which a mold resin is filled in a portion, a recess is formed on at least a part of the surface of the high-voltage terminal facing the inside of the case, and at least a part of a flange formed on the primary bobbin Forming a resin inflow portion, forming at least one protrusion on an axial extension of the flange formed on the secondary bobbin, the primary coil being fixed by the protrusion, and the secondary high-voltage terminal and the primary Bobbin An ignition for an internal combustion engine, wherein a concave-convex pattern is formed around at least one of the secondary bobbins, and a secondary high-voltage terminal provided in the secondary coil is in contact with at least one location of the indentation. A coil.

A case, a primary coil containing at least a part of an iron core composed of a central iron core and an outer peripheral iron core in the case, and winding a primary winding around a primary bobbin in the case; A secondary coil having a secondary winding wound around a secondary bobbin is accommodated, a high voltage terminal for supplying a high voltage to the spark plug is provided in the case, and a mold resin is filled in the coil accommodating part in the case In the ignition coil for an internal combustion engine, a recess is formed in at least a part of a surface of the high-voltage terminal facing the inside of the case, the secondary high-voltage terminal is bent into an N shape, and the secondary high-voltage terminal is An ignition coil for an internal combustion engine characterized by being in contact with a high voltage terminal at two locations.

As described above, a substantially conical indentation is formed on the surface of the high-voltage terminal facing the inside of the case, and the secondary high-voltage terminal provided in the secondary coil is brought into contact with at least one location of the indentation for welding or soldering. The high voltage terminal can be electrically connected from the secondary coil by simply press-fitting the coil portion into the case without using the coil. Even if the tip of the secondary high-voltage terminal is displaced, the allowable range of connection is widened by the substantially conical recess, so that the secondary high-voltage terminal and the high-voltage terminal can be reliably connected without using a guide or the like. it can.

In addition, since at least one protrusion is formed on the axial extension of the flange formed on the secondary bobbin, and the primary coil is fixed by the protrusion, it is possible to prevent the tip of the secondary high voltage terminal from shifting. Furthermore, by forming a concavo-convex pattern around at least one of the secondary high-voltage terminal and the primary bobbin and the secondary bobbin, the adhesiveness with the mold resin is improved. The electrical connection can be made reliably.

Accordingly, it is possible to realize a highly reliable ignition coil that can be easily assembled even with a small ignition coil by performing electrical connection from the secondary coil to the high-voltage terminal without using welding or soldering.

1 is a perspective view of an ignition coil for an internal combustion engine according to a first embodiment of the present invention. It is BB sectional drawing seen from the arrow (A) direction of FIG. It is the C section enlarged view of FIG. It is a perspective view before the assembly of the primary coil and the secondary coil which are the 1st Example of this invention. It is a perspective view after the assembly of the primary coil and the secondary coil which are the 1st Example of this invention. It is side surface sectional drawing of the ignition coil for internal combustion engines which is the 2nd Example of this invention. It is the E section enlarged view of FIG. It is side surface sectional drawing of the ignition coil for internal combustion engines which is the 3rd Example of this invention. It is the H section enlarged view of FIG. 2 is a side cross-sectional view of an ignition coil of Patent Document 1. FIG.

An example showing the embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view of an ignition coil for an internal combustion engine according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line BB in the direction of arrow (A) in FIG. 1, and FIG. 3 is an enlarged view, FIG. 4 is a perspective view before the primary coil and the secondary coil are assembled, and FIG. 5 is a perspective view after the primary coil and the secondary coil are assembled.

1 to 5, a case 40 forming the outer shape of the ignition coil 100 is formed by a box-shaped integral molding having an opening surface on the upper surface in the vertical direction. A case fixing portion 42 for attaching and fixing the ignition coil 100 to an engine head (not shown) is formed on the side surface of the case 40. A high voltage tower 44 having a high voltage terminal 60 for supplying a secondary voltage to the ignition plug is formed on the outer bottom surface of the ignition coil 100 so as to protrude into a plug hole formed in the upper part of the engine. The bottom surface of the case 40 is formed in a substantially conical shape. Further, the high voltage tower 44 includes a protector (not shown) provided with a conductive member for supplying a secondary voltage output from the ignition coil 100 to the ignition plug from the high voltage terminal 60.

The case 40 includes an iron core composed of an I-shaped central iron core 30 and a U-shaped outer iron core 32 formed by laminating a plurality of thin plates, and an outer periphery of the central iron core 30. A primary coil 14 in which a primary winding 12 is wound about 100 turns around the outer periphery of a primary bobbin 10 made of resin, and an outer periphery of a secondary bobbin 20 made of resin on the outer periphery of the primary coil 14 The outer winding core 32 is composed of a coil portion of a secondary coil 24 in which the secondary winding 22 is wound around 8000 to 15000 turns, and the outer peripheral iron core 32 has a magnetic path of the iron core perpendicular to the opening surface of the case 40. Are arranged as follows. Furthermore, a magnet 38 for generating a magnetic flux in the opposite direction to the magnetic flux generated by the primary coil 14 in the magnetic path is provided at one end of the connecting surface of the central iron core 30 and the outer peripheral iron core 32. .

A secondary high voltage terminal 26 is provided on the high voltage side of the secondary bobbin 20, and the winding end of the secondary winding 22 is wound around the other end 26 b of the secondary high voltage terminal 26. Further, a secondary low voltage terminal is provided on the low voltage side of the secondary bobbin 20, and a diode for preventing discharge to the spark plug due to a back electromotive voltage when the ignition signal is ON is provided at the secondary low voltage terminal. ing.

Further, an igniter 70 for supplying an ignition signal to the primary coil 14 is provided in the case 40. Further, the igniter 70 is constituted by a switching element, and a substantially flat igniter terminal 72 formed of metal is provided on the base side, the collector side, and the emitter side of the switching element.

A connector 46 is formed on the side surface of the case 40, and the connector 46 includes a substantially flat power connector terminal 62, a ground connector terminal 63, and an ignition signal connector terminal formed of brass. .

Further, the end of the power connector terminal 62 is connected to a battery, the end of the ground connector terminal 63 is connected to an external ground, and the ignition signal connector terminal is connected to the igniter 70.

Further, a substantially conical dent 61 is formed on a part of the surface of the high-voltage terminal 60 facing the inside of the case 40, and the point (d) of one end 26a of the secondary high-voltage terminal 26 contacts the dent 61. Are electrically connected. Further, the secondary high-voltage terminal 26 has an elastic force by tilting the tip of the one end 26a obliquely.

The distal end of the one end 26a of the secondary high voltage terminal 26 is disposed within the radial direction L of the indented portion 61 of the high voltage terminal 60, and the distal end of the one end 26a of the secondary high voltage terminal 26 and the high voltage The contact angle of the indented portion 61 of the terminal 60 is set to an angle that is more acute than perpendicular to the inclined surface. From this configuration, even if the one end 26 a of the secondary high voltage terminal 26 is displaced, it is guided to the bottom of the indented portion 61.

Further, four protrusions 21a are formed at 90 ° intervals in the radial direction on the axial extension of the secondary bobbin flange 21 formed at both ends of the secondary bobbin 20. Further, the radial end portion of the primary bobbin flange 11 formed on the primary bobbin 10 after the assembly of the secondary coil 24 and the primary coil 14 is fixed and axially aligned with the projection 21a.

When the coil portion is press-fitted into the case 40, the secondary low-voltage terminal and the primary winding 12, the dent portion 35 of the central iron core 30, and the secondary high-voltage terminal 26 are connected to the power connector terminal. The electrical connection is made at the same time at 62 and the connection terminal 62, the ground connector terminal 63, and the high voltage terminal 60.

The igniter terminal 72 is led out in a direction perpendicular to the opening surface of the case 40. Further, the igniter terminal 72 is electrically connected by a joining terminal 80 formed of a conductive member such as a metal having elasticity, and the igniter terminal 72 is simultaneously connected by a plurality of the joining terminals 80. .

Further, the igniter terminal 72 is formed with a groove portion for preventing the igniter terminal 72 from coming into contact with the joining terminal 80. Further, the joining terminal 80 is press-fitted into a holder 82 formed of PBT (polybutylene terephthalate), and the holder 82 has three holding portions for fixing the joining terminal 80.

Further, the periphery of the outer peripheral iron core 32 except for the connection surface between the central iron core 30 and the magnet 38 is covered with a cover 50 that adheres to a mold resin formed of PBT.

A protrusion 56 is formed on the horizontal extension of the cover side coil facing surfaces 51a and 51b. Further, the protrusions 56 are formed at four locations along the curved portion 34 of the outer peripheral iron core 32, and the protrusions 56 are formed to have the same length as the radial length of the secondary bobbin flange 21. Has been.

Further, the protrusion 56 is formed at a position where the secondary bobbin flange 21 is hidden by the protrusion 56 when viewed from the upper surface of the case 40. Further, the case 40 is filled with a mold resin 90 that realizes electrical insulation of the ignition coil 100 and physical fixing of each member.

Further, four resin inflow portions 16 are formed at intervals of 90 degrees in the radial direction of the primary bobbin flange 11 at both ends of the primary bobbin 10, and the secondary coil 24 and the primary coil 14 are formed by the resin inflow portion 16. After the assembly, the mold resin 90 is filled between the inner periphery of the secondary coil 24 and the outer periphery of the primary coil 14.

In addition, the periphery of the one end 26a of the secondary high-voltage terminal 26 is processed into a concavo-convex pattern in order to improve the adhesion to the mold resin 90. Further, the side surfaces of the axial end portions of the secondary bobbin flange 21 and the primary bobbin flange 11 are processed into a concavo-convex pattern in order to improve the adhesion to the mold resin 90.

The mold resin 90 is filled to the vicinity of the opening surface of the case 40, and a resin surface 92 is formed in the vicinity of the opening surface.

Also, with the above configuration, when the ignition signal from the ECU is turned on, a current flows to the base of the igniter 70, and a primary current from the battery flows to the primary coil 14. When the ignition signal from the ECU is turned off, the primary current of the primary coil 14 is cut off, a secondary current is generated in the secondary coil 24, and discharged to the spark plug.

As a modification of the first embodiment, the shape and range of the indented portion 61 formed in the high-voltage terminal 60 may be changed to an arbitrary shape according to design circumstances, and the high-voltage terminal 60 is provided in the case 40. The mold resin 90 may be sealed. Further, the dent 61 may be formed by cutting or the like, and the dent 61 may have a fine groove. Furthermore, the secondary high voltage terminal 26 may have an elastic force as a structure having an elastic force other than a structure in which the tip of the one end 26a of the secondary high voltage terminal 26 is inclined obliquely.

In addition, the shape, number, and position of the projections 21a formed on the secondary bobbin flange 21 may be arbitrarily changed according to design circumstances, or the resin inflow portion 16 formed on the primary bobbin flange 11 may be changed. The shape, the number, and the formation position may be arbitrarily changed depending on the design circumstances. Further, the point of contact between the indented portion 61 of the high-voltage terminal 60 and the one end 26a of the secondary high-voltage terminal 26 is not limited to the point (d), and may be arbitrarily changed depending on design circumstances. The shape of the tip of the one end 26a of the terminal 26 may be arbitrarily changed according to design circumstances.

Further, the shape of the bottom surface of the case 40 may be changed to an arbitrary shape depending on the design circumstances. Furthermore, the formation position and shape of the concavo-convex pattern formed on the secondary high-voltage terminal 26, the primary bobbin 10, and the secondary bobbin 20 may be arbitrarily changed according to design circumstances. Further, the high-voltage terminal 60 is formed by cutting, header processing, or the like, but the processing method is not particularly limited as long as the high-voltage terminal 60 can be formed.

Next, FIG. 6 shows a side sectional view of an ignition coil for an internal combustion engine according to a second embodiment of the present invention, and FIG. 7 shows an enlarged view of a portion E in FIG. In the second embodiment, the (d) point of the one end 26a of the secondary high-voltage terminal 26 is in contact with and electrically connected to the recess 61 formed in the high-voltage terminal 60 described in the first embodiment. Since the other structure excluding the structure is the same as that of the first embodiment, the description thereof will be omitted.

6 and 7, the high voltage tower 44 formed on the bottom surface of the case 40 is provided with a high voltage terminal 60, and a substantially conical recess 61 is formed on a part of the surface of the high voltage terminal 60 facing the inside of the case 40. ing. Further, a secondary high voltage terminal 26 having elasticity is provided on the high voltage side of the secondary bobbin 20, a bent portion 27 is formed at one end 26 a of the secondary high voltage terminal 26, and the one end 26 a of the secondary high voltage terminal 26. Has a V-shaped shape. Further, the two points of the one end 26 a of the secondary high-voltage terminal 26, the point (f) and the point (g), are in contact with and electrically connected to the inclined surface of the indented portion 61 of the high-voltage terminal 60.

As a modification of the second embodiment, the shape and range of the indented portion 61 formed in the high-voltage terminal 60 may be changed to an arbitrary shape depending on design circumstances, and the high-voltage terminal 60 is provided in the case 40. The mold resin 90 may be sealed. Further, the shape of the one end 26a of the secondary high voltage terminal 26 is not limited to the V shape, and may be changed to an arbitrary shape depending on the design circumstances. Further, the point of contact between the indented portion 61 of the high-voltage terminal 60 and the one end 26a of the secondary high-voltage terminal 26 is not limited to the point (f) and the point (g), and may be arbitrarily changed depending on design circumstances.

Next, FIG. 8 shows a side sectional view of an ignition coil for an internal combustion engine according to a third embodiment of the present invention, and FIG. 9 shows an enlarged view of a portion H in FIG. In the third embodiment, the (d) point of one end 26a of the secondary high-voltage terminal 26 is in contact with and electrically connected to the recess 61 formed in the high-voltage terminal 60 described in the first embodiment. Since the other structure excluding the structure is the same as that of the first embodiment, the description thereof will be omitted.

8 and 9, the high voltage tower 44 formed on the bottom surface of the case 40 is provided with a high voltage terminal 60, and a substantially conical recess portion 61 is formed on a part of the surface of the high voltage terminal 60 facing the inside of the case 40. ing. Further, a secondary high voltage terminal 26 having elasticity is provided on the high voltage side of the secondary bobbin 20, a bent portion 27 is formed at one end 26 a of the secondary high voltage terminal 26, and the one end 26 a of the secondary high voltage terminal 26. Has an N-shaped shape. Further, the two points of the one end 26 a of the secondary high-voltage terminal 26, the point (i) and the point (j), are in contact with and electrically connected to the inclined surface of the indented portion 61 of the high-voltage terminal 60.

As a modification of the third embodiment, the shape and range of the indented portion 61 formed in the high-voltage terminal 60 may be changed to an arbitrary shape depending on design circumstances, and the high-voltage terminal 60 is provided in the case 40. The mold resin 90 may be sealed. The shape of the one end 26a of the secondary high-voltage terminal 26 is not limited to the N-shape, and may be changed to any shape depending on the design circumstances. The shape of the tip of the one end 26a of the secondary high-voltage terminal 26 is You can change it according to the design circumstances. Furthermore, the point of contact of the indented portion 61 of the high-voltage terminal 60 and the one end 26a of the secondary high-voltage terminal 26 is not limited to the points (i) and (j), and may be arbitrarily changed depending on the design circumstances.

10: 1 primary bobbin
11: Primary bobbin flange
12: Primary winding
14: Primary coil
16: Resin inflow section
20: Secondary bobbin
21: Secondary bobbin flange
21a: protrusion
22: Secondary winding
24: Secondary coil
26: Secondary high-voltage terminal
26a: one end
26b: The other end
27: Bending part
30: Central iron core
32: Outer iron core
34: Music part
38: Magnet
40: Case
42: Case fixing part
44: High-pressure tower
46: Connector
50: Cover that adheres to mold resin
51a, 51b: Cover side coil facing surface
56: Projection
60: High voltage terminal
61: Recessed part
62: Connector terminal for power supply
63: Connector terminal for grounding
70: Igniter
72: Igniter terminal
80: Junction terminal
82: Holder
90: Mold resin
92: Resin surface
100: Ignition coil

Claims (11)

A case, and at least a part of an iron core composed of a central iron core and an outer peripheral iron core is accommodated in the case,
A primary coil in which a primary winding is wound around a primary bobbin and a secondary coil in which a secondary winding is wound around a secondary bobbin are accommodated in the case.
A high-voltage terminal for supplying a high voltage to the spark plug in the case;
In the ignition coil for an internal combustion engine in which the coil housing portion in the case is filled with mold resin,
Forming a dent on the surface of the high-voltage terminal facing the inside of the case;
An ignition coil for an internal combustion engine, wherein a secondary high-voltage terminal provided in the secondary coil is in contact with at least one place with the dent portion. The ignition coil for an internal combustion engine according to claim 1, wherein the secondary high-voltage terminal has an elastic force. The ignition coil for an internal combustion engine according to claim 1 or 2, wherein the recess is formed in a substantially conical shape. The contact point between the secondary high-voltage terminal and the high-voltage terminal is disposed within a specified range from a central axis of the indented portion of the high-voltage terminal to a lead-out side of the secondary high-voltage terminal. Item 4. An ignition coil for an internal combustion engine according to Items 1 to 3. Forming a bent portion in at least one location of the secondary high-voltage terminal;
5. The ignition coil for an internal combustion engine according to claim 1, wherein the secondary high voltage terminal is in contact with the high voltage terminal at two or more locations. The secondary high voltage terminal is bent into a V shape,
The ignition coil for an internal combustion engine according to claim 1, wherein the secondary high-voltage terminal is in contact with the high-voltage terminal at two locations. The secondary high-voltage terminal is bent into an N shape,
The ignition coil for an internal combustion engine according to claim 1, wherein the secondary high-voltage terminal is in contact with the high-voltage terminal at two locations. Forming a resin inflow portion on at least a part of the flange formed on the primary bobbin;
Forming at least one protrusion on the axial extension of the flange formed on the secondary bobbin;
The ignition coil for an internal combustion engine according to claim 1, wherein the primary coil is fixed by the protrusion. 9. The ignition coil for an internal combustion engine according to claim 1, wherein a concavo-convex pattern is formed around at least one of the secondary high voltage terminal, the primary bobbin, and the secondary bobbin. A case, and at least a part of an iron core composed of a central iron core and an outer peripheral iron core is accommodated in the case,
A primary coil in which a primary winding is wound around a primary bobbin and a secondary coil in which a secondary winding is wound around a secondary bobbin are accommodated in the case.
A high-voltage terminal for supplying a high voltage to the spark plug in the case;
In the ignition coil for an internal combustion engine in which the coil housing portion in the case is filled with mold resin,
Forming a dent on the surface of the high-voltage terminal facing the inside of the case;
Forming a resin inflow portion on at least a part of the flange formed on the primary bobbin;
Forming at least one protrusion on the axial extension of the flange formed on the secondary bobbin;
The primary coil is fixed by the protrusion,
An uneven pattern is formed around at least one of the secondary high-voltage terminal, the primary bobbin, and the secondary bobbin;
An ignition coil for an internal combustion engine, wherein a secondary high-voltage terminal provided in the secondary coil is in contact with at least one place with the dent portion. A case, and at least a part of an iron core composed of a central iron core and an outer peripheral iron core is accommodated in the case,
A primary coil in which a primary winding is wound around a primary bobbin and a secondary coil in which a secondary winding is wound around a secondary bobbin are accommodated in the case.
A high-voltage terminal for supplying a high voltage to the spark plug in the case;
In the ignition coil for an internal combustion engine in which the coil housing portion in the case is filled with mold resin,
Forming a dent on the surface of the high-voltage terminal facing the inside of the case;
The secondary high-voltage terminal is bent into an N shape,
The ignition coil for an internal combustion engine, wherein the secondary high voltage terminal is in contact with the high voltage terminal at two locations.

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