JP6184833B2 - Ignition device for internal combustion engine - Google Patents

Description

  The present invention relates to an ignition device for an internal combustion engine, and more particularly to an ignition device for an internal combustion engine that is suitable when a power generation coil is integrally formed.

  In a general-purpose engine having an ignition device that does not use a conventional battery or the like, a permanent magnet is attached to one place in a circumferential direction such as a flywheel connected to the crankshaft of the engine, and a magnet generator is provided facing the outer periphery of the flywheel. ing. The magnet generator has an ignition coil. In the ignition coil, a primary coil is wound around the outer periphery of the core, and a secondary coil is wound around the outer periphery of the primary coil. Using the voltage induced in the primary coil of the ignition coil, a high voltage is generated in the secondary coil and applied to the spark plug.

  Such magnet-type contactless ignition devices are roughly classified into an induction discharge type and a capacity discharge type. In the inductive discharge type, the transistor intermittently induces the induced current generated in the primary coil of the ignition coil. When the power is generated, the transistor is temporarily short-circuited and the current is turned on, and this current is cut off at a predetermined timing. Generate a transient voltage. On the other hand, in the capacity discharge type, the output of the primary coil of the ignition coil is temporarily charged into the capacitor, and a current is suddenly supplied to the primary coil at a predetermined timing to generate a transient voltage in the secondary coil.

  A conventional example of an induction discharge type ignition device is described in Patent Document 1. In the ignition device described in this publication, the rotation speed is detected from a trigger coil provided alongside the primary winding of the ignition coil. When the voltage of the primary winding voltage is equal to or greater than the value for sustaining the spark, an ignition signal is output according to the data.

  A conventional example of a capacitive discharge type ignition device is described in Patent Document 2. In the capacitor discharge type internal combustion engine ignition device described in this publication, an ignition coil is provided in a magnet generator together with an exciter coil, and an ignition is generated by the sum of the voltage generated by the exciter coil and the voltage generated by the primary coil of the ignition coil. Charging capacitor for energy storage. Then, the first and second winding frame portions around which the coil is wound are aligned and integrated in the axial direction, an exciter coil is wound around the first winding frame portion, and a primary coil is wound around the second winding frame portion. ing. For the production of the primary coil and the exciter coil, the winding operation is automatically performed by the same winding machine by using the coil conductors of the same wire diameter and winding them with the same winding direction.

  Furthermore, in the ignition coil used in the ignition device, in order to reduce the size and improve the output, the drive current supplied to the ignition coil is increased compared to the conventional one, and the total cross-sectional area of the single primary conductor of the conventional primary coil is disconnected Patent Document 3 describes that a plurality of primary conductors having the same area are wound around a bobbin in parallel.

JP 2009-156203 A JP-A-10-196503 JP 2002-260938 A

  In general-purpose engines used for brush cutters, etc., from the viewpoint of further miniaturization and cost reduction, there is no battery and the electric power generated between the permanent magnets and the ignition coil provided on the flywheel is used as the power source. doing. In such a battery-less engine, since the induced voltage can be used once started, advanced control using a control device such as a microcomputer becomes possible for subsequent operation control.

  Therefore, in order to ignite stably at the time of low-speed rotation of the engine, for example, in Patent Document 1, a trigger coil is provided separately from the ignition coil so that a power source can be secured even at a low speed. Although this trigger coil is smaller than the primary winding voltage of the primary winding, it outputs a synchronized trigger coil voltage, and the generated power is supplied to a microcomputer and a periodic signal generator. Thus, since the action of the trigger coil is different from that of the primary coil of the ignition coil, generally the wire diameter suitable for the application is used, and the wire diameter of the primary coil is not necessarily the same. For this reason, the number of manufacturing steps is increased, which may increase the cost.

  In the ignition device of Patent Document 2, the primary coil and the exciter coil arranged side by side in the axial direction are composed of conducting wires of the same wire diameter, and these are wound by the same winding machine, improving workability. Yes. However, in the ignition device described in Patent Document 2, the exciter coil and the primary coil are wound in the same winding direction by the coil conductor having the same wire diameter. Therefore, when a further amount of current is required for the primary coil, it is necessary to increase the wire diameter of the primary coil. Alternatively, it is necessary to join the wire ends with the plurality of windings in the same winding direction using the method of Patent Document 3 described below.

  In the former method, the diameter of the body of the exciter coil is not necessary, but the diameter becomes large, and the ignition device becomes large. In the latter case, it is necessary to make the winding direction of the plurality of windings the same, and thus the operation of cutting and rewinding the coil once is repeated a plurality of times, or a work and an apparatus for winding a plurality of conductors at the same time are required. As a result, workability is reduced and the apparatus is complicated. In other words, in the ignition device described in Patent Document 2, the primary coil and the other coil are connected to the integrated bobbin so that the primary coil and the coil connected in series with the primary coil are different or opposite to each other. Is not configured to wind.

  Further, the ignition coil described in Patent Document 3 describes so-called double winding of the ignition coil for miniaturization. However, the coil described in this publication is composed of a plurality of conductors at the same time. A coil that can use a positive voltage for a control power supply has the same wire diameter as the primary coil and the same winding. It cannot be wound with a wire machine.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a desired inductance for a primary coil and a charging coil in a non-contact ignition device for a general-purpose engine with a simple configuration that does not require a battery. In addition, an impedance is easily obtained, and the configuration is small, simple, and highly reliable. Moreover, the desired inductance and impedance can be easily obtained for each of the primary coil and the charging coil when the microcomputer or CPU power source is obtained from the induced voltage of its own ignition coil and the microcomputer can be controlled. Another object is to provide a highly reliable configuration.

To achieve the above object, the present invention is the battery is an internal combustion engine for a point fire apparatus unnecessary contactless manner, winding a charging coil and the primary coil to the primary bobbin yoke is inserted through a coil A secondary bobbin around which a secondary coil is wound is disposed on the outer peripheral side of the coil portion, and the primary coil is composed of a plurality of coils connected in parallel. The primary coil and the charging A coil is connected in series, and the charging coil and the primary coil composed of the plurality of coils are connected to a plurality of terminals formed on the primary bobbin without cutting one conductor in the middle. It is characterized in that it is configured by selectively binding the parts.

Another feature of the present invention to achieve the above object, attaching a permanent magnet to the outer periphery of the flywheel coupled to a crankshaft of the engine, by using the output of the oppositely disposed charging coil to the permanent magnet, the ignition coil 1 For a contactless internal combustion engine that applies a sudden current change to the secondary coil , generates a high voltage in the secondary coil of the ignition coil, and generates a spark discharge in the spark plug connected to the secondary coil to ignite In the ignition device, the charging coil is formed coaxially with the primary coil, the primary coil and the charging coil are configured by a single continuous conductor, and the primary coil is a plurality of the primary coils. It consists of parallel coils.

And in this feature, it is preferable to connect at least two of the plurality of coils constituting the primary coil to be a parallel coil without cutting the conductor in the middle, and the primary coil and A coil part is constituted by the charging coil, and the coil part is wound around a primary bobbin, and the primary coil is formed so that the coil part has an inductance and an impedance required during power generation and ignition operation. It is desirable to determine the number of turns of the plurality of coils and the number of turns of the charging coil.

  According to the present invention, on the primary coil side of the non-contact ignition device of a general-purpose engine, a plurality of coils are created from one continuous conducting wire having the same wire diameter, and one of the plurality of coils Since the intermediate portion has a tap, a primary coil and a charging coil having desired impedance and inductance can be easily created. At the same time, the configuration can be made small and simple. Furthermore, since the voltage in the positive direction induced in the charging coil is used as the power source of the microcomputer or CPU, the control by the microcomputer or CPU becomes possible, and the primary coil side can be configured simply and with high reliability.

1 is a front sectional view of an embodiment of an ignition device for an internal combustion engine according to the present invention. FIG. 2 is a circuit diagram of the internal combustion engine ignition device shown in FIG. 1. It is an example of the voltage waveform induced at the terminal 63b in FIG. 2A. It is sectional drawing and the side view which show the detail of the primary side coil of the ignition device shown in FIG. It is sectional drawing and the side view which show the detail of the other Example of the primary side coil of the ignition device shown in FIG. It is a circuit diagram of the other Example of the ignition device for internal combustion engines which concerns on this invention.

  Hereinafter, an embodiment of an ignition device 100 for an internal combustion engine according to the present invention will be described with reference to the drawings. FIG. 1 is a front sectional view of an internal combustion engine ignition device 100 provided on the outer peripheral side of a flywheel connected to a crankshaft of a general-purpose internal combustion engine (engine). The general-purpose internal combustion engine handled in this embodiment has an exhaust capacity of about 1000 cc or less, and can be used for a brush cutter, a lawn mower, an outboard motor or the like.

  The ignition device 100 does not include an external power source such as a battery, and adopts a manual activation method such as a recoil starter method that starts by pulling a rope or the like or a kick start method. In order to use these manual activation methods and to have a small and simple configuration, no battery is mounted.

  For example, in a recoil starter type internal combustion engine, the crankshaft 1 connected to the internal combustion engine rotates by pulling a rope. An iron flywheel 2 is attached to the crankshaft 1. In a recess 5 formed in a part of the outer periphery of the flywheel 2, a permanent magnet 4 magnetized in the radial direction of the flywheel 2 is fixed at one location in the circumferential direction. The flywheel 2 and the permanent magnet 4 constitute a magnet rotor. In the magnet rotor, a magnetic field of three poles is formed by a magnetic pole (N pole in FIG. 1) outside the permanent magnet 4 and a pair of magnetic poles (S pole in the example of FIG. 1) led to both sides of the recess 5. A magnet is constructed.

  On the other hand, an ignition device 100 as a stator is fixed to a case or a cover of the internal combustion engine and faces the magnet rotor 10. The ignition device 100 has magnetic pole portions 13 and 14 opposed to the magnetic poles of the magnet rotor 10 at the tip, and yokes 15 and 16 that are spaced apart from each other, and a rectangular bar shape that is connected to the yoke at a substantially right angle. The core 12 is provided. The core 12 and the yokes 15 and 16 are formed in a C shape.

A primary bobbin 57 having both ends formed in a flange shape is attached to the core 12. A coil L is wound around the bobbin over a plurality of layers. Coil L constitutes the charging coil _{L CH} and the primary coil _{L 1} of the ignition device 100 as will be described in greater detail below. On the outer peripheral side of the coil L, a secondary bobbin 58 in which the secondary coil L2 of the ignition device 100 is wound over a plurality of layers is disposed. A partition portion is formed in the intermediate portion in the axial direction of the secondary bobbin 58 to form a mounting seat for the control board 55. The primary bobbin 57 and the secondary bobbin 58, the coil L wound around the primary and secondary bobbins 57 and 58, and the secondary coil L ₂ are accommodated in the case 11.

A circuit diagram of the ignition device 100 is shown in FIG. 2A. The charging coil _LCH is connected in series with the two primary coils L ₁₁ and L _{12 included in the} ignition coil unit to constitute the coil unit L. Charging coil _LCH has one end connected to terminal 63a and the other end connected to terminal 63b. Two of the primary coil _{L 11, L 12} is the one end terminal 63 b, the other end is connected to the terminal 63a, constituting the primary coil _{L 1.} The two primary coils L ₁₁ and L ₁₂ are connected in parallel. One end of the secondary coil L ₂ is connected to the terminal 63a side through the yoke 12. The other end of the secondary coil L ₂ is connected to the spark plug 22 as described above.

One end of the primary coil L ₁ is connected to the collector of the power transistor Tr. The emitter side of the power transistor Tr is connected to the terminal 63a side, and the base side of the power transistor Tr is connected to a CPU (microcomputer) 42 including a ROM and a RAM.

A rotation speed detection circuit 41 and a power supply circuit are connected to the CPU 42. Power supply circuit is a parallel circuit of a capacitor _{C 1} and the Zener diode ZD _1. Diodes D ₂ and D ₃ are connected to the rotation speed detection circuit 41 and the power supply circuit, respectively. In the above circuit diagram, for convenience of explanation, illustration of some resistors and the like is omitted.

Next, the operation of the internal combustion engine ignition apparatus 100 configured as described above will be described below. In a recoil starter type internal combustion engine, a crankshaft rotates by pulling a rope connected to the starter. When the crankshaft rotates, the magnetic flux changes due to the interaction between the permanent magnet 4 positioned on the outer peripheral side of the flywheel 2 attached to the crankshaft and the coil portion L of the ignition device 100 as shown in FIG. induced voltage is generated L ₁ and the charging coil _{L CH.}

That is, the rotation angle of the crankshaft, at the angle of the permanent magnet 4 reaches the magnetic pole portion 13 of the yoke tip by mutual induction between the permanent magnet 4 and the magnetic pole portion 12, the primary coil L ₁ and charging coil L _CH A positive voltage is induced. When the crankshaft continues to rotate, the induced voltage increases and then decreases. Further permanent magnet 4 rotates the crankshaft reaches the primary coil L _1, in contrast to heretofore, negative voltage is induced in the primary coil L ₁ and charging coil L _CH. The absolute value of the negative induced voltage increases as the crank angle θ increases, but eventually decreases, and changes from the negative induced voltage to the positive induced voltage. Thereafter, when the permanent magnet 4 passes the magnetic pole portion 14 of the yoke 16, the induced voltage disappears.

Due to the rotation of the crankshaft, the magnetic flux change generated in the core 12 generates an induced voltage in the primary coils L ₁₁ and L ₁₂ and the charging coil L _CH wound around the outer periphery of the core 12. The induced voltage V _B generated in these coils L ₁₁ , L ₁₂ , and L _CH has the circuit configuration shown in FIG. 2A in the embodiment shown in FIG. 1, and therefore has the voltage waveform shown in FIG. 2B. . Here, the induced voltage VB is a value of the terminal 63b with reference to the terminal 63a in FIG. 2A.

In FIG. 2B, the horizontal axis indicates time t, which is a value corresponding to the rotation angle θ of the crankshaft. A value corresponding to one rotation of the crankshaft (θ = 360 degrees) is indicated by a period T. Permanent magnet 4 provided on the outer periphery of the flywheel 2 has reached the one yoke 15 attached to the core 12, the induced voltage in the core 12 wound by turning the primary coil L _11, L ₁₂ and charging coil L _CH The negative induced voltage _vb1 is generated at the terminal 63b shown in FIG. 2A.

As described above, the winding directions of the primary coils L ₁₁ and L ₁₂ and the charging coil L _CH are configured such that all the current flows in the same direction when a negative induced voltage is generated. Yes. As a result, an electric current flows from the terminal 63b through the primary coils L ₁₁ and L ₁₂ and then the terminal 63a, the charging coil L _CH , and the terminal 63c due to the induced voltage.

In other words, when the terminal 63b to a reference voltage terminal 63a becomes higher than the terminal 63b by the primary coil _{L 11, L 12,} the voltage at the terminal 63c by the charging coil _{L CH} and the terminal 63a to the reference is from the terminal 63a Also gets higher. At that time, a simple current path from the terminal 63a and terminal 63c to terminal 63b is not formed, mainly as a power source to charge coil _{L CH,} current diode _{D 3} from the terminal 63c, and then the capacitor _{C 1,} a route of terminal 63a flow, the capacitor _{C 1} is charged. Here, the Zener diode ZD ₁ acts to keep the capacitor C ₁ below a certain voltage.

As described above, when the permanent magnet 4 approaches each of the coils L ₁₁ , L ₁₂ , and L _CH due to the rotation of the crankshaft, the drive power of the CPU 42 connected to the capacitor C ₁ is secured by the current generated by the induced voltage. Is done. At the same time, a current also flows through the path of the diode D ₂ connected from the terminal 63c to the rotation detection circuit 41, and then the rotation detection circuit 41 and the terminal 63a. As a result, the rotation detection circuit 41 can supply the rotation pulse signal to the CPU 42.

  The CPU 42 calculates the rotation speed of the crankshaft based on the rotation pulse signal output from the rotation detection circuit 41. From the time when the CPU 42 outputs the rotation speed signal, the CPU 42 supplies the base current to the transistor Tr. As a result, the transistor Tr is turned on.

In Figure 2B, the range of the induced voltage _{v b2} the voltage _{v b} induced at the terminal 63b becomes positive, this induced voltage _{v b2,} charged from terminal 63c coil _{L CH,} terminals 63a, 1 primary coil _{L 11,} A path through which current flows is formed in the order of L ₁₂ and terminal 63b. In other words, the voltage of the terminal 63a by charging coil _{L CH} terminal 63c as a reference is higher than the terminal 63c, the primary coil _{L 11, L 12} and terminal 63a as a reference voltage of the terminal 63b higher than the terminal 63a Become. At this time, a current path from the terminal 63b or the terminal 63a to the terminal 63c is not formed. Therefore, if induced voltage _{v b} is positive, the current path is formed, the primary coil _{L 11, L 12} as a power supply, the only path that flows from the terminal 63b transistor Tr, to the terminal 63a.

As described above, the CPU 42 initially maintains the transistor Tr in the ON state, and at the timing according to the rotation speed of the crankshaft obtained by calculating the rotation pulse signal output from the rotation detection circuit 41, the base of the transistor Tr Shut off the supply current to the. Thereby, the transistor Tr is turned off. When the transistor Tr is turned off, the energization currents of the primary coils L ₁₁ and L ₁₂ are suddenly cut off. By mutual induction induced voltage is generated in the secondary coil L _2, the spark plug 22 is applied, the spark plug 22 is ignited by dielectric breakdown.

In this embodiment, the primary coils L ₁₁ and L ₁₂ are configured in parallel, and the charging coil L _CH is configured in series with the primary coils L ₁₁ and L ₁₂ configured in parallel. Furthermore, a new method different from the conventional method is adopted as the winding method of each of the coil coils L ₁₁ , L ₁₂ , L _CH , and L ₂ . The winding method will be described in detail below.

Each coil _{L 11, L 12, L CH} , a method of winding _{L 2,} will be described with reference to FIGS. FIGS. 3A and 3B are views of an embodiment of the primary bobbin 57 and the coil portion L. FIG. 3A is a left side view thereof, FIG. 3B is a front sectional view, and FIG. It is the A section enlarged view of (b).

The primary bobbin 57 has a hollow quadrangular prism shape having flange portions on both the left and right sides, and the hollow portion 72 is fitted to the core 12. The one flange portion of the primary bobbin 57, upper and lower are substantially equal intervals in three terminals 63a~63c is formed, each coil L ₁₁ constituting the coil portion L as shown in FIG. _2, L _12, each end of the _{L CH} is connected.

Here, as a characteristic configuration of the present invention, the coil portion L including the primary coils L ₁₁ and L ₁₂ and the charging coil L _CH is configured by a single conductive wire. That is, one lead wire is supplied to the primary bobbin 57 from a coil winding machine (not shown). Then, the portion corresponding to the primary coil L _11, is wound from the terminal 63a of the circuit diagram shown in Figure 2A. At that time, the winding start is wound around the tab terminal 63a, and the set number of turns is wound on the primary bobbin 57 in a plurality of layers. The bottom layer of a white circle wound around the primary bobbin 57 in FIG. 3C corresponds to this. Thereafter, the conducting wire is bound to the tab terminal 63b.

A plurality of layers of the conductive wire wound around the tab terminal 63b are wound around the primary bobbin 57 by the number of turns set for reverse rotation. The hatched circle in FIG. 3C corresponds to this. This coil layer constitutes the primary coil L12. When the conducting wire is wound around the primary bobbin 57 by a predetermined number of turns, it is entangled with the tab terminal 63a again. Thus the primary coil _{L 1} comprising a winding direction of two different primary coil _{L 11, L 12} is formed.

In FIG. 3C, the number of layers of the primary coils L ₁₁ and L ₁₂ is two, but this figure is exemplary, and the number of layers is optimal as the primary coils L ₁₁ and L _{12 to the} last. Determined from the number of turns. Since the primary coil L ₁ is required to generate a predetermined induced voltage and induced current in the secondary coil L ₂ as described above, the coils L ₁₁ , L constituting the primary coil L ₁ are required. ₁₂ is connected in a two parallel coils, and to have the necessary inductance and impedance as the primary coil L _1, wire diameter and number of turns is determined in advance. That is, depending on the size of the conducting wire diameter, the winding method described above is repeated a plurality of times to adjust the inductance and impedance.

Next, conductive wires tied to the tab terminal A, to return the winding direction to form a charging coil L _CH outside of the primary coil L _1. In FIG. 3C, the white circle on the outside corresponds to this. Until inductance and impedance are required to charge the coil L _CH, turning only necessary turns winding, Karageru the terminal to the tab terminal 63c. In FIG. 3C, only one layer of the charging coil _LCH is wound, but this is also exemplarily shown. As described above, the power supply power required for the CPU 42 and the generated pulses of the rotation detection circuit 41 are used. Wind as many turns as you need to get the power you need. That is, the number of turns of the plurality of coils L ₁₁ and L _{12 and} the number of turns of the charging coil L _CH that form the primary coil L ₁ are determined so that the coil portion L has a high inductance during power generation and a low impedance during an ignition operation. Then, the conducting wire entangled with the tab terminals 63a to 63c is joined to a predetermined portion of the control board 55. Thus, each power generation characteristics of the coil _{L 11, L 12, L CH} , to optimize available.

FIG. 4 shows another winding mode of the coil portion L. 4A is a left side view of the primary bobbin 59 and the coil portion L, FIG. 4B is a front cross-sectional view, FIG. 4C is an enlarged view of a portion B in FIG. 4B, and FIG. ) Is an enlarged view of a portion C in FIG. The embodiment shown in FIG. 4 differs from the embodiment shown in FIG. 3 in the winding position of the charging coil _LCH . For this reason, the point that the coils L ₁₁ and L ₁₂ constituting the primary coil are concentric multilayers is the same as that of the embodiment of FIG. 3, but the axial position thereof is changed.

That is, in the primary bobbin 59, a yoke 12 has a partition is formed in the middle portion in the axial direction of inserted through the primary coil L ₁ on the right side of the partition the charging coil L _CH in Figure on the left side of the partition Forming. Tab terminals 63 a to 63 c are formed on the partition portion of the primary bobbin 59 or on either the left or right flange portion. The end portions of the conductive wires after winding the primary coils L ₁₁ and L ₁₂ and the charging coil L _CH a predetermined number of times are connected to any one of these tab terminals 63a to 63c on the same basis as the embodiment shown in FIG. It is tied.

Also in this embodiment, the primary coils L ₁₁ and L ₁₂ are wound around the primary bobbin 59 until the inductance and impedance required for the primary coil L ₁ are reached, and the impedance and inductance required for the supply coil L _CH are obtained. Is wound around the primary bobbin 59. Further, these coils L ₁₁ , L ₁₂ , and L _CH are formed without being cut halfway from the same conducting wire so as to have the above electric characteristics.

  As shown in the above embodiments, the primary coil is realized by a parallel configuration of a plurality of coils. Specifically, when the first primary coil is wound up to the end of the winding, the winding direction is switched to wind in the reverse winding, and the first primary coil is joined at a later time at the beginning of winding. At that time, the charging coil is wound in a predetermined winding direction without cutting the conductive wire of the coil. Thereby, the primary coil and charging coil from which an application differs can be comprised with one conducting wire and one bobbin. Furthermore, both the primary coil and the charging coil can have the optimum impedance and inductance required for each coil. As a result, not only the productivity of the ignition device for an internal combustion engine is improved, but also the ignition device can be reduced in size and cost.

DESCRIPTION OF SYMBOLS 2 ... Flywheel, 4 ... Permanent magnet, 5 ... Recess, 11 ... Case, 12 ... Core, 13, 14 ... Magnetic pole part, 15, 16 ... Yoke, 21 ... High voltage cord, 22 ... Spark plug, 41 ... Rotation detection circuit 42 ... CPU (microcomputer), 55 ... control board, 57 ... primary bobbin, 58 ... secondary bobbin, 59 ... primary bobbin, 63a to 63c ... terminal, 72 ... through hole, 100 ... ignition device, C _1- C 3 _{... capacitors, D} 1 ~D 6 _... diodes, L ... coil _{portion, L 1, L 11, L} 12 ... 1 primary coil, _{L 2} ... 2 coil, L _{CH ...} charging coil, R 1 _... resistor, Th ₁ ... thyristors, Tr ... power transistor, ZD 1 _... Zener diode, theta ... crank angle.

Claims (4)

Battery is an internal combustion engine for a point fire apparatus unnecessary contactless manner, the yoke constitutes the coil portion by winding a charging coil and the primary coil to the primary bobbins inserted through, by winding a secondary coil A secondary bobbin is disposed on the outer peripheral side of the coil portion, the primary coil is composed of a plurality of coils connected in parallel, the primary coil and the charging coil are connected in series, and the charging coil and the plurality of coils are connected. The primary coil composed of the coil of the first coil is configured by selectively tangling the intermediate portion of the conductive wire to a plurality of terminals formed on the primary bobbin without cutting a single conductive wire halfway. An internal combustion engine ignition device. A permanent magnet is attached to the outer periphery of a flywheel connected to the crankshaft of the engine, and an abrupt current change is applied to the primary coil of the ignition coil by using the output of the charging coil arranged opposite to the permanent magnet. of to generate a high voltage in the secondary coil, the ignition system of the contactless type which ignites by generating a spark discharge in the spark plug connected to the secondary coil, wherein the primary coil coaxially A charging coil is formed, the primary coil and the charging coil are configured by a single continuous wire, and the primary coil is configured by a plurality of parallel coils. Ignition device. 3. The internal combustion engine for an internal combustion engine according to claim 2, wherein at least two of the plurality of coils constituting the primary coil are connected to form a parallel coil without cutting the conducting wire in the middle. Ignition device. The primary coil and the charging coil constitute a coil portion, and this coil portion is wound around a primary bobbin so that the coil portion has the inductance and impedance required during power generation and ignition operation. The ignition device for an internal combustion engine according to claim 3, wherein the number of turns of a plurality of coils forming the next coil and the number of turns of the charging coil are determined.

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