JP4063304B2 - Ignition device for internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine ignition device, and more particularly to a cylindrical ignition device housed in a plug hole.

  As disclosed in Patent Document 1, the conventional ignition device accommodates an open magnetic path core inside a cylindrical case, and a primary coil and a secondary coil are fitted outside the core. This was an open magnetic circuit type ignition device in which an insulating resin was cast and cured in a case, and a side core was built in a cylindrical wall in the case.

Japanese Patent Laid-Open No. 2-92913

  According to the present invention, in an ignition device of a type in which an igniter is accommodated in an igniter case portion provided at a low pressure side end portion of a cylindrical coil case, a problem relating to electrical insulation between the coil portion and the igniter portion is solved.

  In particular, an object of the present invention is to provide an ignition device for an internal combustion engine, in which a coil portion and an igniter portion are cast and insulated with the same resin, and the castability is good.

In order to achieve the above object, an ignition device for an internal combustion engine according to the present invention has a cylindrical center core disposed inside a cylindrical side core mounted on a cylindrical case portion, and the cylindrical side core and the center core A cylindrical coil portion is disposed between the igniter unit case portion and the igniter unit case portion for housing the igniter unit at the low pressure side end portion of the cylindrical case portion. Filling insulating resin is injected into the case portion to surround the center core and the coil portion with the filling insulating resin, and a connector for connecting the igniter unit and an external circuit is provided on the outer periphery of the igniter unit case portion. The elastic member is formed at the end of the center core on the injection side of the filled insulating resin and the elastic member is disposed. The igniter unit is fixed at a position shifted in the radial direction from the center of the coil portion at the core end, and the filling insulating resin injected between the igniter unit and the cylindrical case portion allows the center core to The elastic member disposed at the end and the coil portion are surrounded, and the igniter unit and a connection portion between the igniter unit terminal and the connector terminal are filled in the igniter unit case portion. The igniter case portion has two sides facing each other across one side where the connector is provided, and the upper end opening of the cylindrical case is located between the two sides. The igniter unit is provided with the connector of the igniter case part on one side where the terminals are arranged. Two sides sandwiching one side where the terminals are arranged extend in a direction away from the connector along the two sides of the igniter case part, and the terminals of the igniter unit and the terminals of the connector The connecting portion is formed between one side of the igniter case portion provided with the connector and one side where the terminals of the igniter unit are arranged .

Furthermore, a positioning protrusion in the radial direction of the igniter unit is provided around the igniter unit. Preferably, the center core includes an elastic material, the center core includes the elastic member that separates the filling insulating resin and the center core at a low-pressure side end, and the filling insulating resin has a thermal expansion coefficient. It is a resin material having a value close to that of a copper heat sink.

Moreover, the cylindrical side core attached to the cylindrical case portion has a cut extending in the axial direction. Further, the elastic member is provided inside a bobbin that encloses the center core at the low-pressure side end of the center core .

According to the present invention, the igniter unit is arranged so as to cover the coil winding portion (primary coil) , that is , castability of a filling insulating resin such as an insulating epoxy resin, wiring workability with the primary coil 2, etc. more Rukoto be placed in a range which does not adversely affect the, together with the ignition coil, when the igniter and the terminal connecting portion to the resin molded together with the filling the insulating resin, to thereby preventing damaging the casting resin, filling an insulating resin Therefore, the durability of the ignition device for an internal combustion engine such as electrical insulation can be improved .

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a sectional view showing the configuration of an internal combustion engine ignition device according to an embodiment of the present invention. The primary bobbin 1 is formed of a thermoplastic synthetic resin as an elastic material such as polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS), and a primary coil 2 is wound around the primary bobbin 1. A secondary coil 4 is wound around a secondary bobbin 3 formed of a thermoplastic synthetic resin as an elastic material such as modified polyphenylene oxide (modified PPO). A cylindrical coil layer is configured from at least the primary coil 2 and the secondary coil 4. That is, in the case of a coil layer having a structure without a bobbin, the secondary coil is simply wound around the primary coil via the electrical insulating layer.

  Specifically, the primary coil 2 is wound with enameled wires having a wire diameter of about 0.3 to 1.0 mm several tens of times per layer, about 100 to 300 times in total over several layers. The secondary coil 4 is wound by dividing about 5000 to 20000 times in total using an enameled wire having a wire diameter of about 0.03 to 0.1 mm.

  On the other hand, the case 5 is formed of a thermoplastic synthetic resin as an elastic material similar to the primary bobbin 1, and the case 5 and the connector portion 24 are integrally formed. In the case of the cylindrical ignition device as in the present embodiment, the axial dimension becomes long, so that a taper of 1 ° or less is required for molding. For this reason, the taper is provided only in the coil housing portion inside the case 5.

  The center core 7 that forms the main core of the inner core is formed by press laminating silicon steel plates, and is disposed inside the primary bobbin 1 as a constituent member made of an elastic material. The side core 8 as an outer core is disposed on the outer periphery of the case 5 outside the secondary coil 4 and is formed by rolling a thin silicon steel plate into a cylindrical shape.

  The side core 8 has a cut 8a extending in the axial direction and expanding in the circumferential direction, which will be described later. The side core 8 of this embodiment is composed of a single silicon steel plate having a thickness of 0.3 to 0.7 mm. However, it is possible to reduce the eddy current loss by stacking two or more sheets and increase the cross-sectional area of the side core 8 to improve the output.

  In order to complete the closed magnetic circuit by magnetically coupling the center core 7 forming the main inner closed magnetic path and the side core 8 forming the outer closed magnetic circuit, the secondary core is extended at the both ends of the center core 7 in the radial direction. The low voltage side core 18 on the low voltage side of the coil 4 and the high voltage side core 9 on the high voltage side of the secondary coil 4 are arranged separately. In addition, the inner core comprised from the center core 7, the high voltage | pressure side core 9, and the low voltage | pressure side core 18 forms the inner side closed magnetic circuit.

  In the present embodiment, the center core 7 and the low pressure side core 18 are integrally pressed into a T shape and accommodated inside the primary bobbin 1. The upper portion of the low-pressure side core 18 is covered with an elastic member 12 made of a flexible epoxy resin or a rubber material. Thereby, the insulating epoxy resin 6 as the filling insulating material is isolated from the center core 7 and the low-pressure side core 18. Forming integrally with the T-shaped core as described above reduces the loss of magnetic energy (magnetic loss), improves the assembly workability between the low-pressure side core 18 and the primary bobbin 1, or This leads to a reduction in core mold costs.

  The high-pressure side core 9 is housed in a pocket portion 3 a provided in the secondary bobbin 3 as a constituent member made of an elastic material, and is isolated from the insulating epoxy resin 6. The pocket portion 3 a for storing the high-pressure core 9 can be provided not only in the secondary bobbin 3 but also in the primary bobbin 1 and the case 5. That is, the pocket portion 3a can be integrally formed with any of the primary bobbin 1, the secondary bobbin 3, and the case 5. Furthermore, only the pocket portion 3a can be press-fitted into the case 5 or bonded and fixed as a separate component.

  A part of the closed magnetic circuit core has a core gap, and a magnet 10 that generates a magnetic flux in a direction opposite to the magnetic flux formed by the primary coil 2 is fitted in the core gap. The magnet 10 is operated below the saturation point of the magnetization curve of the silicon steel sheet core by generating a magnetic flux in the opposite direction in the magnetic path. For example, if a magnet having a holding force of 5 kOe or more is used, demagnetization due to heat is small, so that it can be integrally formed with a resin case.

These coil part components are press-fitted into the case 5, have a Tg point of 115 ° C. to 135 ° C., and a thermal expansion coefficient of 10 to 50 × 10 ⁻ as an average value in a temperature range below the Tg point. It is insulated from a high voltage by an insulating layer made of an insulating epoxy resin 6 having a value close to a copper heat sink of ⁶ / ° C., for example, about 25 × 10 ⁻⁶ / ° C.

  The high voltage generated in the secondary coil 4 reduces the length of the ignition device even a little, so that the pre-ignition high-voltage diode 17, the high-voltage terminal 13, and the spring are arranged in a direction perpendicular to the longitudinal direction. 14 to the spark plug. The portion where the spark plug is inserted is insulated by a rubber boot 15 such as silicon rubber. A seal rubber 16 for sealing is provided at a portion in contact with the cylinder head cover.

  An igniter unit 20 located in the upper part of the coil and accommodated in the case 5 is an electric circuit that generates a high voltage for ignition. A power transistor chip 21 and a hybrid IC circuit 28 are built in a metal base 26 made of copper or aluminum press-molded into a box shape, and filled with silicon gel 29. The igniter unit 20 is positioned by positioning protrusions 53 and 52 (not shown in FIG. 1) of the igniter unit 20 provided in the case 5.

  The metal base 26 has an igniter-side terminal 22 made of a thermoplastic synthetic resin such as polybutylene terephthalate, and an integrally formed terminal block 27 bonded with a silicon adhesive. The igniter side terminal 22 is electrically connected to the primary coil terminal 23 and the connector side terminal 25 by welding.

  Next, the structure of the present invention will be described in detail with reference to the main component development view of FIG. FIG. 2 is a development view of main components in the embodiment of FIG. The center core 7 is pressed and laminated integrally with the low-pressure side core 18 and formed as a T-shaped core according to an embodiment of the present invention. The T-shaped core composed of the center core 7 and the low-pressure side core 18 after the magnet 10 is attached is accommodated inside the primary bobbin 1. In other words, the T-shaped core as one inner core is included in the primary bobbin 1.

  Further, in the case of the cylindrical coil as in the present embodiment, a T-shaped core is fixed and accommodated in the primary bobbin 1 in order to facilitate the assembly of the low-pressure side core 18 from above the primary bobbin 1 in the axial direction. For this purpose, a T-shaped pocket portion 1a is formed. Therefore, the primary bobbin 1 made of an elastic material is also used as a constituent member made of an elastic material containing the inner core so as to isolate one inner core made of the center core 7 and the low-pressure side core 18 from the filling insulating material 6. Will be.

  In this case, the closed magnetic path gap between the low-pressure side core and the side core in the portion in which the low-pressure side core 18 is accommodated is as follows if the thickness of the case 5 and the primary bobbin 1 and the magnetic loss are considered. It will be limited to the range of 0 mm to 2.5 mm. The T portion height Hp of the T-shaped pocket portion 1a provided for casting the elastic member 12 made of a flexible epoxy resin or the like for absorbing thermal stress on the upper portion of the low pressure side core 18 is as follows. It is comprised so that it may become higher than 18 T part height Hc.

  By the way, there are various examples of the T-shaped core. The embodiment shown in FIG. 3 is an embodiment in which the center core 7 and the low-pressure side core 18 are combined with blocks that are pressed and laminated in a polygonal shape by separately changing the press width of the silicon steel plate. Further, as shown in FIG. 4, there is an embodiment in which the width is gradually increased and decreased in the pressing process of the silicon steel sheet so as to increase the cross-sectional area closer to a cylindrical shape. Separately from FIG. 3 and FIG. 4, the center core 7 and the low-pressure side core 18 can be integrally laminated by sequentially increasing and decreasing the press width to form a T-shaped core as shown in FIG.

  Returning to FIG. 2, the primary bobbin 1 as one component member including one internal core as shown in the figure is press-fitted into the secondary bobbin 3 via the press-fit portion 1c. The secondary bobbin 3 as the other constituent member has a pocket portion 3a for accommodating the high-pressure side core 9 as the other inner core inserted from the radial direction, and the high-pressure side core 9 is included in the pocket portion 3a. Later, it is press-fitted and fixed to the case 5 via the press-fitting portion 3c.

  In this case, the closed magnetic path gap between the high-pressure side core 9 and the side core 8 is 1.0 mm to 2 in consideration of the thickness of the case 5, the thickness of the secondary bobbin 3, and the magnetic loss. It will be limited to a range of .5 mm. The high-pressure side core 9 is also isolated from the insulating epoxy resin 6 by the press-fitting fitting structure of the primary bobbin 1 and the secondary bobbin 3 and the secondary bobbin 3 and the case 5.

  As described above, the inner core including the center core 7, the low-pressure side core 18 and the high-pressure side core 9 enclosed by the primary bobbin 1 and the secondary bobbin 3 as constituent members made of an elastic material serves as a filling insulating material. It is isolated from the insulating epoxy resin 6. For this reason, thermal stress or thermal shock generated by the difference in thermal expansion coefficient between the inner core and the filling insulating material is absorbed by the primary bobbin 1 and the secondary bobbin 3 as constituent members made of an elastic material, and the heat Cracks of the insulating epoxy resin 6 caused by stress and the like, and peeling of the insulating epoxy resin from other members are prevented.

  On the other hand, a cylindrical side core 8 as an outer core that is disposed outside the case 5 and forms an outer closed magnetic path has a cut 8a that extends in the axial direction and can expand in the circumferential direction. By expanding the cut 8a in the circumferential direction, it is possible to escape from deformation and distortion in the radial direction due to thermal expansion of the inner core and the filling insulating material.

  In other words, if there is no cut 8a, the deformation or the like pressed by the cylinder escapes in the axial direction, and the thermal stress or the like in the axial direction increases. Therefore, by having the cut 8a, an increase in the axial thermal stress is avoided, and cracking of the insulating epoxy resin 6 due to the thermal stress and peeling of the insulating epoxy resin 6 from other members are prevented. Will be.

  Further, after assembling the center core 7, the low pressure side core 18, the primary bobbin 1, and the secondary bobbin 3, which are the main components shown in FIG. That is, the elastic member 12 mainly for absorbing the thermal stress in the axial direction is cast into the dimensional difference of (Hp−Hc) described above, and the upper side of the low-pressure side core 18 is covered with the elastic member from the axial direction. Then, the low-pressure side core 18 or the center core 7 is isolated from the insulating epoxy resin 6 as the filling insulating material.

  The elastic member 12 mainly absorbs axial thermal stress (axial thermal stress that tends to increase as described above) generated by the difference in thermal expansion coefficient between the inner core and the filling insulating material. The effect of preventing cracks and peeling can be further enhanced.

  The above can be summarized as follows. That is, in order to prevent the filled insulating material from coming into direct contact with the core, the surroundings of the core such as the center core and the high-pressure side core are enclosed by the constituent members such as the primary bobbin, the secondary bobbin, or the case, By using a structure that is isolated from each other, it is possible to prevent the occurrence of internal cracks and peeling between the filling insulating material and the constituent members.

  Further, in the case of a cylindrical coil, considering assembly workability, components are assembled from the upper side in the axial direction, so the low-pressure side core is accommodated in the primary bobbin from the upper side in the axial direction of the primary bobbin. However, the upper part of the low-pressure side core cannot be covered with a component such as a primary bobbin because of the assembly workability of the cylindrical coil, so the elastic member for absorbing thermal stress is filled with the low-pressure side core. It is put between insulating materials.

  In other words, parts that are difficult to enclose with the structural members such as the primary bobbin, secondary bobbin, or case are covered with an elastic member that absorbs thermal stress between the core and the filling insulating material, and the internal cracks are thereby isolated. In addition, the occurrence of peeling between the filling insulating material and the constituent member can be prevented. As a result, a highly reliable cylindrical ignition device excellent in thermal shock resistance and insulation is provided.

  FIG. 6 is a layout diagram of an igniter unit according to an embodiment of the present invention. As shown in FIG. 6, the position of the igniter unit 20 is fixed by positioning projections 52 and 53 provided on the case 5, and the vertical direction is positioned by placing it on the case 5. The positioning protrusions 52 and 53 are such that the protrusions extend to the upper end surface of the case 5 so as to facilitate assembly workability from above the case 5.

  The connector side terminal 25a is connected to the primary coil terminal 23b, and the other connector side terminals 25b and 25c are connected to the igniter side terminals 22c and 22b, respectively. Furthermore, the igniter side terminal 22a and the primary coil terminal 23a are connected. The primary coil terminals 23 a and 23 b are arranged on both sides of the igniter unit 20 because of the connection from the primary bobbin 1.

  Next, FIG. 7 is a partial bird's-eye view showing the connection structure of FIG. 6, and a method for connecting to the primary coil will be described in detail with reference to the drawing. The primary bobbin 1 is provided with a primary coil terminal press-fit pocket portion 1b for fixing the primary coil terminal 23a, and the primary coil terminal 23a is press-fitted and fixed to the pocket portion 1b. The primary coil winding portion 23a1 of the primary coil terminal 23a is bent in an L shape in the radial direction (vertical direction) from the primary bobbin 1, and is configured to easily wind the terminal of the primary coil 2. Yes.

  Also, on the side to be welded with the igniter-side terminal 22a, a curved portion 23a2 is provided in part for the purpose of relaxing and absorbing stress during welding and preventing the stress from being transmitted to the primary coil winding portion 23a1. Yes. The igniter side terminals 22a, 22b, and 22c and the connector side terminals 25a, 25b, and 25c are processed into an L shape.

  Moreover, since the welding locations are arranged in a horizontal row, the welding operation is easy. Furthermore, in the case of welding work, it is necessary to configure so that spatter does not scatter to the coil winding portion. In this embodiment, as shown in FIG. 6, the igniter unit 20 uses the coil winding portion (primary coil 2). ) To cover. However, it is necessary to arrange the insulating epoxy resin 6 within a range that does not adversely affect the castability of the insulating epoxy resin 6 and the wiring workability with the primary coil 2.

  Furthermore, the welding position of each terminal is set to 1 mm or more from the coil housing part 5c of the case 5 in order to keep the spatter scattering range away from the coil winding part. Moreover, the position of the tip of the terminal to be welded is configured to be 2 to 6 mm inside from the end face of the case 5 and is always covered with the insulating epoxy resin 6 to ensure waterproof reliability.

  After the igniter unit 20 is fixed and the insulating epoxy resin 6 is cast and cured as described above, the high-pressure core 9 is housed in the pocket portion 3a of the secondary bobbin 3 and fixed with an adhesive. The cylindrical side core 8 is attached to the case 5 using the spring action of the side core 8 made of

  By the way, the cut 8a provided in at least one place extending in the circumferential direction of the side core 8 facilitates the use of the spring action, and is useful for improving the assembly workability when the side core 8 is inserted into the case 5. It is also a thing. Further, the cut 8a is useful for preventing a short turn of the magnetic flux. At the same time, the high pressure side core 9 is pressed by the spring action of the cylindrical wall surface of the side core 8 and is useful for fixing the high pressure side core 9 to the pocket portion 3a.

  Here, the maximum outer diameter in an automobile engine and a cylindrical ignition device will be described. Specifically, in an automobile engine having an exhaust capacity of about 1000 to 3000 cc, severe dimensional restrictions are imposed on an elongated cylindrical ignition device housed in a plug hole drilled in a narrow cylinder block. . Therefore, if the secondary energy generation value of the ignition device is limited to 30 (mJ), the maximum outer diameter of the coil portion of the ignition device is in the range of φ22 mm to φ24 (mm), and the total length of the coil portion is 130 to 150. It is limited to an elongated cylindrical shape in the range of (mm).

  As described above, the closed magnetic circuit gap between the low-pressure side core 18 and the side core 8 and the closed magnetic circuit gap on the non-direct contact side between the high-pressure side core 9 and the side core 8 are in the range of 1.0 mm to 2.5 mm. In this case, the thickness is limited to the thickness range of the elastic material including the inner core so as to be isolated from the filling insulating material.

  FIG. 8 is a cross-sectional view showing a configuration of an internal combustion engine ignition device according to another embodiment of the present invention. FIG. 9 is a layout diagram of the igniter unit of the embodiment shown in FIG. This is an embodiment in which the igniter unit 20 is a one-chip type igniter 42. The one-chip type igniter 42 is screwed to the heat radiating metal plate 41 or fixed with an adhesive having excellent thermal conductivity. The metal plate 41 is fixed by positioning protrusions 52 and 54 provided on the case 5. Since the terminal connection method, configuration, and the like are the same as those of the embodiment shown in FIGS. 1, 6, and 7, description thereof will be omitted.

  The problems, objects, means for solving the problems, and operational effects of the embodiments of the present invention are summarized as follows.

  In the prior art, the periphery of the core is in direct contact with the filling insulating material, and the difference in the thermal expansion coefficient between the core and the filling insulating material is large. Further, there has been a problem that peeling occurs between the filling insulating material and a constituent member such as a core, and dielectric breakdown occurs at the generated portion.

  Therefore, an object of the present embodiment is to provide a highly reliable ignition device for an internal combustion engine that is excellent in insulation durability and prevents internal cracks and separation between an insulating material and a constituent member.

  An ignition device for an internal combustion engine according to the present embodiment that achieves the above object includes a cylindrical coil layer including a primary coil and a secondary coil wound around the primary coil via an electrical insulating layer, A center core disposed in the cylinder of the coil layer and extending in the axial direction, and a low-pressure core and a high-pressure core that are disposed at both ends of the center core and are divided into a secondary coil low-pressure side and a high-pressure side and are respectively extended in the radial direction. An inner core that forms a magnetically coupled inner closed magnetic path, a filling insulating material that electrically insulates between the coil layer and the inner core, and the inner core. A component member made of an elastic material that encloses the inner core so as to be isolated from the insulating material, the inner core that is filled with the filler insulating material and fixed by the filler insulating material, the component member, and the coil layer. A housing case, A possible break of the spreading circumferentially extending in a direction, are arranged on the outer periphery of the case is intended to include a cylindrical outer core forming an outer closed magnetic circuit.

  Further, the constituent member is also used as a primary bobbin for the primary coil, and the primary bobbin includes the center core and the low-pressure side core, and the low-pressure side core included in the primary bobbin is The upper side of the low-pressure side core may be covered with an elastic member from the upper side in the axial direction and isolated from the filling insulating material.

  In other words, the core is surrounded by components such as a primary bobbin, a secondary bobbin, or a case so that the filled insulating material does not directly contact the core and is isolated from the filled insulating material. . Further, a portion that is difficult to enclose with a constituent member such as a primary bobbin, a secondary bobbin, or a case has a structure in which an elastic member that absorbs thermal stress is covered and isolated between the core and the filling insulating material.

  According to the present embodiment, each core is insulated by enclosing it with a resin component having elasticity such as a primary bobbin, a secondary bobbin, or a case, or by covering a part of the core with an elastic member. Since it can be isolated from the epoxy resin for use, cracks due to thermal stress and separation between constituent members are prevented, and the durability (insulation deterioration resistance, etc.) of the ignition device for an internal combustion engine is improved.

It is sectional drawing which shows the structure of the ignition device for internal combustion engines which is one Example of this invention. It is an expanded view of the main components in the Example of FIG. It is a figure which shows the T-shaped core of the other Example by this invention. FIG. 6 is a diagram showing a T-shaped core according to another embodiment of the present invention. FIG. 6 shows a T-shaped core according to another embodiment of the present invention. FIG. 3 is a layout view of an igniter unit according to an embodiment of the present invention. It is a partial bird's-eye view which shows the connection structure of FIG. It is sectional drawing which shows the structure of the ignition device for internal combustion engines which is the other Example of this invention. FIG. 9 is a layout view of igniter units in the embodiment of FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Primary bobbin, 1a ... T-shaped pocket part, 1b ... Primary coil terminal press-fit pocket part, 1c, 3c ... Press-fit part, 2 ... Primary coil, 3 ... Secondary bobbin, 3a ... Pocket part, 4 ... 2 Next coil, 5 ... Case, 5c ... Coil housing, 6 ... Insulating epoxy resin, 7 ... Center core, 8 ... Side core, 8a ... Cut, 9 ... High-pressure side core, 10 ... Magnet, 12 ... Elastic member, 13 ... High pressure Terminals 14 ... Spring 15 ... Rubber boots 16 ... Seal rubber 17 ... High voltage diode 18 ... Low pressure side core 20 ... Ignator unit 21 ... Power transistor chip 22, 22a, 22b, 22c ... Ignition side terminal 23 23a, 23b ... primary coil terminal, 23a1 ... primary coil winding part, 23a2 ... primary coil terminal curved part, 24 ... connector, 25, 25a, 25 25c ... Connector side terminal, 26 ... Metal base, 27 ... Terminal block, 28 ... Hybrid IC circuit, 29 ... Silicon gel, 41 ... Heat sink, 42 ... One-chip igniter, 43 ... Screw, 52, 53, 54 ... Positioning protrusion.

Claims (5)

A cylindrical center core is disposed inside a cylindrical side core mounted on the cylindrical case portion, a cylindrical coil portion is disposed between the cylindrical side core and the center core, and the cylindrical case portion An igniter unit case part for accommodating an igniter unit is provided at the low-pressure side end of the igniter unit, and a filling insulating resin is injected into the igniter unit case part and the cylindrical case part to fill the center core and the coil part. A connector for connecting the igniter unit and an external circuit is formed integrally with an outer peripheral portion of the igniter unit case portion, and is provided at a center core end portion on the injection side of the filled insulating resin. The elastic member is disposed, and the center core end portion where the elastic member is disposed is displaced in the radial direction from the center of the coil portion. A nighter unit is fixed, and the filling insulating resin injected between the igniter unit and the cylindrical case portion surrounds the periphery of the elastic member disposed at the end of the center core and the coil portion. Further, the igniter unit and a connection portion between the igniter unit terminal and the connector terminal are surrounded by the filled insulating resin filled in the igniter unit case portion, and the igniter case portion is provided with a connector. And the upper end opening of the cylindrical case is located between the two sides, and the igniter unit has one side on which the terminals are arranged as the igniter. Two sides facing one side of the case portion where the connector is provided and sandwiching one side where the terminals are arranged are The igniter case portion extends in a direction away from the connector along the two sides, and a connection portion between the igniter unit terminal and the connector terminal is provided on one side of the igniter case portion provided with the connector and the igniter unit An ignition device for an internal combustion engine, wherein the terminal is formed between one side where the terminals are arranged .   The ignition device for an internal combustion engine according to claim 1, wherein a positioning protrusion in a radial direction of the igniter unit is provided around the igniter unit.   2. The elastic member according to claim 1, further comprising an elastic material that encloses the center core, the elastic member that separates the filling insulating resin and the center core from the low-pressure side end of the center core, and the filling insulating resin is thermally expanded. An internal combustion engine ignition device characterized in that the coefficient is a resin material having a value close to that of a copper heat sink.   2. The internal combustion engine ignition device according to claim 1, wherein the cylindrical side core attached to the cylindrical case portion has a cut extending in an axial direction.   2. The ignition device for an internal combustion engine according to claim 1, wherein the elastic member is provided inside a bobbin that encloses the center core at a low-pressure side end of the center core.

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