JP5934457B2 - Ignition coil for internal combustion engine and method of manufacturing the ignition coil - Google Patents

Description

  The present invention relates to an ignition coil for an internal combustion engine and a method for manufacturing the ignition coil, and particularly has a feature in the configuration of an insulating structure around the coil assembly and its manufacturing method.

  In recent years, in the manufacture of ignition coils used in automobiles and the like, a technique for forming a coil assembly including an iron core and a coil and then insert-molding an insulating structure around the coil assembly has been studied.

  For example, in Japanese Patent Application Laid-Open No. 2011-171659 (Patent Document 1), a connection case part in which a connector part and a flange part are integrally formed is used, and an iron core, a coil, and the like are assembled in the frame of the connection case part. It is done. And this coil assembly is thrown into an insert molding machine, and the main body of an ignition coil is completed.

JP 2011-171659 A

  However, according to the technique of Patent Document 1, since the connector portion and the flange portion are integrally formed in the connection case, when assembling the coil or the like to the connection case, the terminal of the connector portion or the grounding bush of the flange portion is coiled. Therefore, it is necessary to conduct and wire the wires, and the welding and conduction work becomes very complicated.

  Here, when insert-molding the coil / iron core assembly, it is also conceivable to insert-mold the structure of the connector portion and the flange portion together. However, according to this manufacturing method, the inside of the mold at the time of insert molding becomes a high pressure, and there is a problem that the arrangement of components such as a coil and an iron core is displaced, and the ignition coil cannot perform its intended function. In addition, if the mold internal pressure is set low, there is a problem that the resin does not reach a complicated part such as a connector part.

  In addition, since a high voltage of about several hundreds kV is generated in the secondary coil, a high-quality insulating performance is required for the insulating structure around the secondary coil. On the other hand, the insulation structure around the primary coil is not required to have the same insulation performance as the insulation structure around the secondary coil. That is, in the vicinity of the coil / iron core, if it is desired to achieve both cost reduction and sufficient performance, it is necessary to match the resin material to be selected according to the required level of insulation performance.

  In view of the above problems, an object of the present invention is to provide an ignition coil for an internal combustion engine that incorporates a preferable insulating structure and an ignition coil manufacturing method that contributes to simplification of the manufacturing work of the insulating structure.

In order to solve the above problems, the present invention provides the following method for manufacturing an ignition coil for an internal combustion engine. That is, a high-pressure part insulation structure forming step of manufacturing a high-pressure part impregnated body by filling the internal gap space of the high-pressure part case body containing the secondary coil in a liquid state with an epoxy resin and curing the coil assembly in the structure of the coil assembly; When a non-high-voltage coil component excluding the secondary coil is mounted on the high-pressure-impregnated body, the coil assembly is pressure-impregnated with a molten thermosetting resin and then thermally cured and non-cured. A transfer molding process for producing a high-pressure part impregnated body, and an injection molding process in which an additional structure is formed in which a molten thermoplastic resin is filled in the contact space with the non-high-pressure part impregnated body and adhered to the thermosetting resin. A method of manufacturing an ignition coil for an internal combustion engine comprising :
The additional structure forms at least one of a connector part in which a plurality of terminals are arranged inside, or a flange part provided with a relay conductor for forming a ground current path; To do.

  Preferably, the transfer molding step impregnates the conductive structure with the thermosetting resin so that a part of the conductive structure protrudes to the outside, and the injection molding step includes the thermosetting resin of the conductive structure. The additional structure is formed so as to include a structure portion protruding from the outside.

In the present invention, the internal combustion engine ignition coil is configured as follows. That is, the high-voltage part impregnated body in which the internal gap space of the case body for the high-voltage part containing the secondary coil is filled and cured in the coil assembly structure, and the secondary coil in the coil assembly structure. A non-high-pressure part impregnated body obtained by impregnating and curing a non-high-pressure part coil component with a thermosetting resin, and an additional structure made of a thermoplastic resin attached to the thermosetting resin,
The non-high-pressure part impregnated body contains a portion where the secondary coil is arranged in the high-pressure part impregnated body,
A conductive structure that forms an electrical conduction path is disposed on an attachment surface between the non-high-pressure portion impregnated body and the additional structure, and the non-high-pressure portion impregnated body is disposed in one region with the attachment surface as a boundary. It is fixed and fixed to the additional structure in the other region with the adhering surface as a boundary.

Preferably, in the non-high-pressure part impregnated body, the coil assembly includes the non-high-pressure part coil component impregnated and hardened in the non-high-pressure part impregnated body and the secondary coil housed in the non-high-pressure part impregnated body. Is assumed to be formed.
Preferably, the additional structure forms at least one of a connector part in which a plurality of terminals are arranged inside, or a flange part provided with a relay conductor for forming a ground current path. I will do it.

  According to the method for manufacturing an ignition coil for an internal combustion engine according to the present invention, since the high-pressure portion impregnated body is manufactured independently of other insulating structures, an insulating material suitable for a portion requiring high insulation performance is provided. It is effectively used only in the required part, and the material cost can be reduced.

  Moreover, since the remaining components of the coil assembly are assembled from the outside of the impregnated body, the temporary assembly of the coil assembly can be easily assembled in the high-pressure part impregnated body according to the present invention. The high-pressure part impregnated body also functions as a member for maintaining the temporary assembly of the coil assembly, so that the placement work in the mold becomes easy in the transfer molding process, and the work in the manufacturing process is simplified. It is done.

  Further, according to the ignition coil for an internal combustion engine according to the present invention, since the transfer molding is performed on the portion excluding the shape of the flange portion and the flange portion, the mold internal pressure in the process can be set low, It is also possible to avoid a situation where the regular layout of the assembled coil assembly is destroyed.

The figure explaining the high voltage | pressure part impregnation body which concerns on an Example. The figure explaining the non-high voltage | pressure part components which concern on an Example. The figure explaining the non-high pressure part impregnation body and additional structure which concern on an Example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. An internal combustion engine ignition coil (hereinafter referred to as an ignition coil) includes a high-pressure part impregnated body and a non-high-pressure part impregnated body, and these components form an integral structure.

  Here, d1 indicates the direction on the spark plug side with respect to the central axis of the plug hole, and is referred to as a high pressure direction. d2 indicates a direction opposite to the high-pressure direction d1 with respect to the central axis of the plug hole, and is referred to as a low-pressure direction. Further, f1 indicates a direction in which the connector is arranged with respect to the central axis of the I-shaped iron core (described later) and is referred to as a connector direction. f2 indicates the direction opposite to the connector direction f1 with respect to the central axis of the I-shaped iron core. In the present embodiment, a flange is disposed near that direction. For convenience, the flange direction f2 is referred to. And

  FIG. 1 shows a manufacturing process of a high-pressure part impregnated body according to this example. First, in manufacturing the high-pressure part impregnated body 100, a high-pressure cover 110, a secondary coil 120, and a coil housing part 130 are prepared (see step 1).

  The high-pressure cover 110 is a divided part of the shell, and the openings 112 and 111 are formed in an L shape in the high-pressure direction d1 and the connector direction f1. The high-voltage cover 110 is shaped along the general shape of the secondary coil 120 so as to cover a part of the secondary coil 120.

  The secondary coil 120 is obtained by winding a secondary wire (copper wire) around an insulating secondary bobbin. This secondary bobbin uses an insulating resin such as PBT, and a plurality of flanges 124 are formed at predetermined intervals. And the secondary wire is each wound in the clearance gap of a collar part. In addition, an annular body 122 protruding at a predetermined thickness in the connector direction f1 is formed at one end of the flange portion, and an insertion hole 121 is formed therein. The insertion hole 121 is a through-hole that reaches the other end of the jaw, and an annular body 123 that protrudes with a predetermined thickness in the flange direction f2 is formed on the other end of the jaw. Further, the secondary coil 120 is appropriately provided with a coil terminal that ties the end of the secondary wire (not shown). In addition, the secondary coil 120 comprises a coil assembly with the primary coil and iron core which are mentioned later. Of these, only the secondary coil 120 is accommodated in the high-pressure unit impregnated body 100.

  In the coil housing part 130, the housing part 131, the space forming half body 133, the bottom part 135, and the connection part 136 are integrally formed of an insulating resin (PPS, PBT, etc.). Among these, the accommodating part 131 forms the other half of the shell-like body by the wall surface and the bottom part 135 which surround four sides, and the accommodating space 132 is formed in the inside. Thus, the accommodating part 131 and the bottom part 135 accommodate a part of the secondary coil 120. In addition, an appropriate portion 131 a of the wall portion surrounding the four sides is provided with a notch 131 b so as to be fitted to the annular bodies 122 and 123 of the secondary coil 120.

  In the coil housing assembly 130 according to the present embodiment, a connection portion 136 is provided so as to be connected to the bottom portion 135. The connection part 136 is formed with a communication hole (not shown) connected from the accommodation space 132 to the high voltage direction d1, and a high voltage terminal (high voltage relay part) is fixed in the middle of the communication hole. That is, the high-voltage terminal is connected to the accommodation space 132 on the one hand through the communication hole and on the other hand to the plug hole in the high-voltage direction d1 through the communication hole.

  The coil housing part 130 is provided with a space forming half 133 at an intermediate position where the notch 131b faces the low-voltage direction d2 and the connection part 136 faces the high-voltage direction d1. The space forming half 133 stores the coil assembly therein with a non-high pressure portion impregnated body described later. The space forming half 133 according to the present embodiment is a substantially circular plate-like body in which the accommodation space 132 is arranged at the center, and a fitting structure 133b with the head cover 230 is formed at the edge thereof. Yes. The space forming half 133 is provided with a tongue piece 133a in the connector direction f1.

  As shown in the drawing, in step 2, a part of the secondary coil 120 is accommodated in the accommodating space 132 of the coil accommodating part 130. At this time, the annular bodies 122 and 123 of the secondary coil 120 are fitted into the notch 131 b of the coil housing part 130, thereby separating the housing space 132 and the external space of the wall 131. The secondary coil 120 is provided with a terminal facing in the high voltage direction d1, and one end of the secondary wire and the high voltage terminal in the connection portion 136 are electrically connected by this process.

  In step 3, the opening 112 of the high-pressure cover 110 and the opening of the wall 131 are brought into contact with each other, and the contact portions of both are fixed. At this time, in the flange direction f <b> 2, the annular body 123 of the secondary coil 120 and the notch (not shown) of the high-pressure cover 110 are fitted to separate the inside and outside of the housing space 132. Such contact portions are easily and accurately integrated by ultrasonic welding. Further, other connection means using an adhesive or the like may be used.

  As shown in the figure, the high-voltage cover 110 covers the remaining portion of the secondary coil 120 exposed at the stage of step 2, and the secondary coil together with the configuration of the housing portion 131 and the bottom portion 135 (main case division). Surrounds 120. As described above, the structure surrounding the secondary coil 120 includes a plurality of parts (the high-voltage cover 110, the wall portion 131, and the bottom portion 135), and corresponds to the high-voltage case body in the claims. In order to form such a structure, the high voltage cover 110 has an opening 112 large enough to accept the secondary coil 120 (a part of the secondary coil), and the wall 131 also has the secondary coil 120 (the secondary coil 120). An opening sized to receive another portion of the receiving portion is formed. That is, the opening of the case body is set to an appropriate size so that the secondary coil housing part can be inserted into both of the case bodies.

  Further, in the connector direction d1, a communication path between the internal gap space (high-pressure portion region) and the external space (non-high-pressure portion region) is formed by the opening 111 of the high-pressure cover 110. This internal gap space (high voltage part region) is a space surrounded and defined by the respective surfaces of the internal structure composed of the secondary coil 120 and the high and low pressure separation structure composed of the case body for the high voltage part. Here, the definition refers to forming a boundary between the internal gap space (the high-pressure part region of the present embodiment) and the external space (the non-high-pressure part region of the present example).

  Thereafter, the case body for the high-pressure part is filled with the epoxy resin 140 in a liquid state through the opening 111 (resin filling hole), and the resin is cured by an appropriate treatment, whereby all the secondary wires are cured. And the high-pressure impregnated body in which a predetermined portion of the high-voltage terminal is impregnated and impregnated is completed (step 4 (not shown) / corresponding to the high-voltage part insulating structure forming step in the claims).

  The high-voltage impregnated body 100 according to the present embodiment is configured such that an insulating structure region having a high required withstand voltage is compactly formed and separated from other insulating structure regions that are allowed even at a low pressure. Therefore, the epoxy resin used here ensures a high withstand voltage by using a high-quality material having high insulation performance. Moreover, since the high-pressure part impregnated body 100 is made compact compared with the whole ignition coil, it is possible to shorten the preheating / curing time in the heat treatment.

  Further, in this embodiment, a configuration that forms a coil assembly other than the secondary coil such as the primary coil and the iron core is excluded. In particular, the high-pressure part impregnated body 100 according to the present embodiment eliminates an I-shaped iron core, which will be described later, by providing an iron core and an insertion hole for a primary coil wound around the core. A feature is recognized in the compactness of the body 100. As a result, the high-pressure part impregnated body 100 has a greatly reduced heat capacity, which is very advantageous in terms of manufacturing for heat treatment of the high-pressure insulating region. Further, the high-pressure unit impregnated body 100 has a structure suitable for mounting the remaining coil assembly, and the assembly operation of the coil assembly is performed only by manufacturing the insulation structure and without using other assembly parts. Is done.

  As described above, in the high-pressure part insulating structure molding step, a liquid epoxy resin is introduced at the time of filling for the purpose of keeping the resin viscosity lower than the press-fit resin in the transfer molding step (described later). For this reason, the epoxy resin 140 fills the interior gap space in detail, and the resin 140 is filled with a small amount of voids, and this is cured to form a high withstand voltage and high quality insulating structure. It also becomes.

  In addition, about the method of hardening an epoxy resin, the method of thermosetting may be used and the method of mixing 2 liquids and chemically hardening may be used. In any case, an epoxy resin having a lower viscosity than the viscosity of the resin press-fitted in the transfer molding step is used.

  When the high-pressure part impregnated body 100 is completed, the coil assembly is assembled in Steps 5 to 6 (see FIG. 2). The coil assembly is an assembly including a secondary coil 120 belonging to a high-voltage part and an outer peripheral core 220 and an insertion body 210 belonging to a non-high-voltage part coil part.

  As shown in step 5, the insert 210 includes an I-shaped iron core 211 made of a laminated silicon steel plate, an insulating layer 215 that insulates the surface, a primary wire 212 (primary coil) wound around the core, and a primary wire. Terminal frame 214 provided at the end of the terminal. In addition, in the terminal frame 214, the portions fitted into the I-shaped terminals are insulators, and the terminal portions 213 are provided on both sides thereof. And in each of the terminal parts 213, each end of the primary wire 212 is wound, and the terminal which conduct | electrically_connects to the said primary wire 212 will be formed.

  The insertion body 210 is inserted into the insertion hole 121 of the high-pressure part impregnated body 100 and assembled and mounted. Thereby, in the connector direction f1, when the terminal frame 214 and the terminal part 213 are arrange | positioned, it arrange | positions so that the end of the exposed surface of the I-shaped iron core 211 may face the direction f1. Further, at the flange side f2, the other end of the exposed surface of the I-shaped iron core 211 is disposed so as to face in the direction f2. Any part of the insertion body 210 is disposed in the non-high-pressure part region.

  Thereafter, as shown in step 6, the outer peripheral iron cores 221 and 222 are attached so as to surround the periphery of the secondary coil of the high-pressure unit impregnated body 100. Each of the outer peripheral iron cores 221 and 222 is in contact with the exposed surface of the I-shaped iron core 211 to form a magnetic flux path. As described above, the non-high voltage part coil component is not so high as the secondary coil even if it is a part that forms the coil assembly, and therefore, the non-high voltage part coil component is disposed around the high-pressure impregnated body 100 and in the non-high voltage part region. The Further, an igniter 240 is mounted on the f1 side of the outer peripheral iron core 220, and the igniter terminal 243 and the terminal portion 213 of the I-shaped iron core are electrically connected. The lower terminal 242 of the igniter is a grounding terminal.

  As described above, since the remaining parts of the coil assembly are assembled from the outside of the impregnated body, the temporary assembly of the coil assembly can be easily assembled. And the said high voltage | pressure part impregnation body does not require an additional component specially, but functions so that the temporary assembly of a coil assembly may be maintained with the required structure of the present Example, such as the insertion hole 121 and the space formation half body 133. FIG.

  Thereafter, in the ignition coil 10 according to the present embodiment, in order to insulate the housing portion of the coil assembly, a non-high pressure portion impregnated body having a predetermined thickness is formed so as to bend around the housing portion. The production of the impregnated body is completed. The withstand voltage required for such a non-high-voltage part impregnated body only needs to withstand the applied voltage of the primary coil, and is sufficiently lower than the required withstand voltage of the high-voltage part region. For this reason, the non-high pressure part impregnated body is not required to have an insulating quality as the high pressure part impregnated body, and the conditions for the heat treatment can be relaxed.

  Step 7 (see FIG. 3A) shows a transfer molding step for manufacturing a non-high-pressure part impregnated body. The mold CS1 used in the process 7 forms the first space X around the coil assembly when the high-pressure unit impregnated body 100 is accommodated in the mold. In step 7, the pressurized and melted thermosetting resin is press-fitted from the plunger, and the first space X is filled with the thermosetting resin R1. For this reason, the coil assembly is impregnated at its periphery with the thermosetting resin R1, and a portion corresponding to the first space X is formed (manufactured) as a non-high-pressure portion impregnated body by thermosetting.

  In particular, the non-high-pressure part impregnated body manufactured in step 7 corresponds to a main part structure around the coil assembly, and does not include complicated shapes such as a connector part and a flange part described later. For this reason, in step 7, although the thermosetting resin R1 is melted and pressurized and pressed into the mold (transfer molding) to produce a structure in the low pressure region, the shape of the space to be pressed is simplified. Therefore, the pressure in the mold chamber can be set low. Therefore, in such a molding process, the part can be impregnated and cured in a regular layout without destroying the layout of the temporarily assembled coil assembly.

  In addition, according to the ignition coil according to the present embodiment, different impregnation bodies are formed according to the required withstand voltage, and therefore the matters regarding the insulating filler are individually set corresponding to each impregnation body. For example, the high-voltage impregnated body 100 can improve the insulation properties of the entire ignition coil by using an epoxy material suitable for a high pressure resistance. In addition, in the non-high pressure part impregnated body, an inexpensive resin material can be used, and further, the heat treatment conditions in the thermosetting process can be relaxed. The thermosetting resin used in the transfer molding process is appropriately selected according to mechanical strength and insulation performance, such as phenol resin, unsaturated polyester, epoxy resin, and the like.

  Step 8 (see FIG. 3B) shows an injection molding step for manufacturing an additional structure. When the mold CS2 used in the process 8 accommodates the intermediate product manufactured in the process 7 in the mold, the second space A to the periphery of the non-high-pressure part impregnated body 235 is included in the intermediate product. B is formed. Each of the second spaces A to B is provided in a portion (contact space portion) in contact with a part of the surface of the thermosetting resin 235 of the intermediate product. Therefore, in Step 8, when the molten thermoplastic resin (PPS, PBT, etc.) is filled into the spaces A to B, the thermoplastic resin also reaches the contact space portion, and the structure of the thermoplastic resin itself A non-high pressure part impregnation body will adhere on the contact surface. Hereinafter, the structures formed in the spaces A to B are referred to as additional structures.

  As shown in the figure, the additional structure formed in the space A is a connector portion 234 provided with connector terminals. Therefore, since the additional structure 234 here is a shell-like body that houses the connector terminal therein, it has a complicated shape. However, according to the present embodiment, since the non-high pressure portion impregnated body has already been cured, the layout of the coil assembly can be protected even if the pressure in the chamber of the mold CS2 becomes high. Therefore, in this embodiment, an injection molding method in which a molten resin is pressurized and press-fitted is employed so that the resin can reliably rotate even in a complicated shape portion.

  Further, the additional structure formed in the space B is a flange portion 232 in which the metal bush 233 is accommodated. Even in the additional structure 232, the non-high-pressure part structure can be manufactured in a subsequent process, thereby simplifying the shape of the non-high-pressure part structure. And the flange part 232 protects its own quality by being formed in an injection molding process.

  According to this embodiment, since the additional structure is manufactured in a process different from that of the non-high-voltage part structure, the manufacturing of the insulating structure around the coil assembly has already been completed, and the layout of the coil assembly can be destroyed. Absent. For this reason, in an injection molding process, it becomes possible to supply molten resin with a desired pressure, and the quality of the additional structure formed by this is maintained.

  In the step 8, when the chamber part of the mold CS2 is filled with resin, the temperature is controlled (cooled) to cure the internal thermoplastic resin. When this process is completed, the molded product is taken out from the chamber, the burrs around the molded product are removed, and the main part of the ignition coil 10 is completed (see step 9).

  As a further feature of the present embodiment, in the transfer molding process, a connector terminal (an example of a conductive structure) or a relay conductor (an example of a conductive structure) that conducts to a metal bush is projected to the outside of the non-high-voltage part structure. A part of these conductive structures is impregnated with a thermosetting resin. That is, at the completion of step 7, one end of the conductive structure is supported by the non-high-pressure part structure.

  In the injection molding process, the additional structure is formed in a state including the structural portion protruding from the previous thermosetting resin. That is, the conductive structure such as the connector terminal is fixed to the non-high-pressure portion impregnated body in one region, and is fixed to the additional structure in the other region. For this reason, both the non-high-pressure part impregnated body and the additional structure are firmly fixed not only by the adhesion force at the boundary between the both structures but also by the adhesion force between the conductive structure and the resin material.

  In particular, the conductive structure is preferably arranged so as to pass through the adhesion surface between the non-high-pressure part impregnated body and the additional structure. As a result, the conductive structure functions as a framework of both resins with the adhesion surface as a boundary so that the adhesion surface does not peel off.

  DESCRIPTION OF SYMBOLS 10 Ignition coil for internal combustion engines, 100 High pressure part impregnation body, 120 Secondary coil (high pressure part parts), 133 Space formation half body, 140 Epoxy resin, 121 Insertion hole, 150 High pressure part case body, 211 I-shaped iron core High-voltage parts), 212 Primary coil (non-high-voltage parts), 220 Peripheral iron core (non-high-voltage parts).

Claims (5)

A high-pressure part insulating structure forming step for manufacturing a high-pressure part impregnated body by filling an internal gap space of a case body for a high-voltage part containing a secondary coil in a coil assembly and then curing the epoxy resin in a liquid state; When the non-high-voltage part coil component excluding the secondary coil is mounted on the high-pressure part impregnated body in the assembly structure, the coil assembly is pressure-impregnated with a molten thermosetting resin and then thermally cured, and the non-high-pressure part A transfer molding process for producing an impregnated body, and an injection molding process in which an additional structure is formed in which a molten thermoplastic resin is filled into a contact space portion with the non-high-pressure portion impregnated body and adhered to the thermosetting resin; A method for producing an ignition coil for an internal combustion engine comprising :
The additional structure forms at least one of a connector portion in which a plurality of terminals are arranged inside, or a flange portion provided with a relay conductor for forming a ground current path. A method of manufacturing an ignition coil for an internal combustion engine.   In the transfer molding step, the conductive structure is impregnated with the thermosetting resin so that a part of the conductive structure protrudes to the outside, and the injection molding step is performed from the thermosetting resin to the outside of the conductive structure. The method for manufacturing an ignition coil for an internal combustion engine according to claim 1, wherein the additional structure is formed including a protruding structural portion. Among the configurations of the coil assembly, the high-pressure portion impregnated body in which the internal gap space of the case body for the high-voltage portion containing the secondary coil is filled and cured with epoxy resin, and the non-excluding the secondary coil in the configuration of the coil assembly. A non-high pressure part impregnated body obtained by impregnating and curing a high pressure part coil component with a thermosetting resin, and an additional structure made of a thermoplastic resin attached to the thermosetting resin,
The non-high-pressure part impregnated body contains a portion where the secondary coil is arranged in the high-pressure part impregnated body,
A conductive structure that forms an electrical conduction path is disposed on an attachment surface between the non-high-pressure portion impregnated body and the additional structure, and the non-high-pressure portion impregnated body is disposed in one region with the attachment surface as a boundary. An ignition coil for an internal combustion engine, wherein the ignition coil is fixed and fixed to the additional structure in the other region with the adhering surface as a boundary . In the non-high-pressure part impregnated body, the coil assembly is formed by the non-high-pressure part coil component impregnated and cured in the non-high-pressure part impregnated body and the secondary coil accommodated in the non-high-pressure part impregnated body. The ignition coil for an internal combustion engine according to claim 3 , wherein The additional structure forms at least one of a connector portion in which a plurality of terminals are arranged inside, or a flange portion provided with a relay conductor for forming a ground current path. The ignition coil for an internal combustion engine according to claim 3 or 4 , characterized in that the ignition coil is used.

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