JP3873687B2 - Ignition device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine ignition device.
[0002]
[Prior art]
In a conventional ignition device for an internal combustion engine of this type, as shown in Japanese Patent Laid-Open No. 10-210723, a plurality of permanent magnets are provided in the circumferential direction on the inner periphery of a cylindrical portion of a flywheel that is rotationally driven by the internal combustion engine. Using an abduction type internal combustion engine drive power generator having a fixed rotor and a stator in which a power generation coil is wound around a plurality of convex poles of a stator core disposed in an internal space facing these permanent magnets, A structure in which a power generation part for an internal combustion engine ignition device is arranged outside the cylinder part, and power is generated using the magnetic force of some of the permanent magnets arranged on the inner periphery of the cylinder part of the flywheel. Met.
[0003]
[Problems to be solved by the invention]
However, in the conventional ignition device for an internal combustion engine having such a structure, since the magnetic force of some of the plurality of permanent magnets arranged on the inner periphery of the cylinder portion of the flywheel is used, Since a plurality of slit holes (transparent windows) that open a part of the cylinder part are provided in the cylinder part, there is a problem that wind noise is generated from the slit hole when the flywheel rotates as the internal combustion engine rotates. there were.
[0004]
In addition, this structure requires a high accuracy in the positional relationship between the slit hole provided in the cylinder portion of the flywheel and the permanent magnet provided in the inner periphery of the cylinder portion of the flywheel, which makes manufacturing difficult. was there.
[0005]
An object of the present invention is to provide an internal combustion engine ignition device that can suppress the generation of wind noise and can easily position a permanent magnet.
[0006]
[Means for Solving the Problems]
The present invention relates to a rotor in which a plurality of permanent magnets (3) are fixed in the circumferential direction on the inner periphery of a cylindrical portion (2a) of a flywheel (2) that is rotationally driven by an internal combustion engine, and an internal space facing these permanent magnets. utilizing external rotor type internal combustion engine driven power generator having a stator (7) which is wound around the power generation coil to a plurality of salient pole of arranged stator iron core (16), the opposite to the outer periphery of the cylindrical portion of the flywheel An internal combustion engine ignition device provided with an internal combustion engine ignition device power generation section (15) that is arranged every time facing a part of the permanent magnets (3) of the plurality of permanent magnets. To do.
[0007]
In the ignition device for an internal combustion engine according to the present invention, the magnetic force of a part of the permanent magnets (3) among the plurality of permanent magnets fixed to the inner periphery of the cylinder portion of the flywheel is used as the power generation unit (15 for the internal combustion engine ignition device). In order to act on the cylindrical portion (2a) of the flywheel, the concave and convex portions (18, 20) arranged on both sides in the circumferential direction of the partial permanent magnet (3) and the partial permanent magnet A plurality of concavo-convex portions including concavo-convex portions (19) provided so as to connect between the concavo-convex portions 18 and 20 on the end portion in the longitudinal direction are formed. Each of the plurality of concave and convex portions (18, 19, 20) includes a recess (18a, 19a, 20a) formed by recessing the outer surface of the cylindrical portion (2a) of the flywheel, and an inner portion of the cylindrical portion (2a). It consists of convex portions (18b, 19b, 20b) protruding from the circumference, and all the concave and convex portions (18, 19, 20) are provided in an unpenetrated state from the outer surface to the inner surface of the cylindrical portion of the flywheel. It has been.
[0008]
In such an internal combustion engine ignition device, the magnetic force of the permanent magnet fixed to the inner periphery of the cylinder portion of the flywheel is applied to the power generation unit for the internal combustion engine ignition device that is disposed opposite to the outer periphery of the cylinder portion. Is an uneven part provided on the cylinder part of the flywheel, and this uneven part is provided with the concave part recessed on the outer surface of the cylindrical part and the convex part protruding from the inner surface of the cylindrical part. For this reason, it is possible to suppress the generation of wind noise when the flywheel is rotated instead of the conventional slit hole (transparent window). Moreover, since the convex part of the inner periphery of the cylinder part of a flywheel is provided between the some permanent magnets of the inner periphery of the cylinder part of a flywheel, positioning of a permanent magnet can also be performed easily.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 to 7 show an example of an embodiment of an ignition device for an internal combustion engine according to the present invention. FIGS. 1 and 2 show an internal combustion engine of this example assembled in an abduction type internal combustion engine drive power generator. FIG. 3 is a plan view of an abduction type internal combustion engine drive power generator, FIG. 4 is an enlarged view of the main part of FIG. 1, and FIG. 5 is a diagram of the main part. FIG. 6 is a circuit diagram of the power generation circuit of the abduction type internal combustion engine drive power generation device shown in FIG. 1, and FIG. 7 is a circuit diagram of the ignition device for the internal combustion engine of this example.
[0010]
The external rotation internal combustion engine drive power generator 1 has a cylindrical portion 2a closed at one end with a bottom plate 2b, and a rotating shaft is fixed to a central boss portion 2c of the bottom plate 2b. A rotor 4 in which a plurality (18) of permanent magnets 3 are fixed in the circumferential direction on the inner periphery of the cylindrical portion 2a, and a plurality of convex poles 5a of a stator iron core 5 disposed in an internal space facing the permanent magnets 3 It has a structure having a stator 7 around which a generator coil 6 is wound. The permanent magnets 3 are polarized so that there are N poles and S poles in the radial direction of the flywheel 2, and the adjacent permanent magnets 3 are arranged so that the polarities facing each other are different.
[0011]
FIG. 6 shows the configuration of the power generation circuit of the abduction type internal combustion engine drive power generator 1. There are three types of power generating coils 6, and one type of power generating coil 6 a is connected to a regulator 10 via a three-phase full-wave rectifier circuit 9 composed of six diodes 8, and the regulator 10 is connected to an inverter 11. The inverter 11 obtains an AC output at a commercial frequency.
[0012]
Another type of single-phase power generation coil 6 b is connected to the power supply circuit 12 that drives the regulator 10 and the inverter 11.
[0013]
The remaining types of the generating coil 6c, the three-phase half-wave rectifier circuit 13 consisting of three diodes is connected, so as to obtain a DC output such as a battery charged by the output of the 3-phase half-wave rectifier circuit 13 ing.
[0014]
The ignition device 14 for the internal combustion engine of this example uses the abduction-type internal combustion engine drive power generation device 1, and also uses a part of the permanent magnets 3 in each permanent magnet 3 to form the cylindrical portion 2 a of the flywheel 2. An internal combustion engine ignition device power generation unit 15 is provided that is disposed to face the outer periphery and generates power each time it faces a part of the permanent magnets 3. The internal combustion engine ignition device power generation unit 15 includes a coil 17 including a primary coil 17a and a secondary coil 17b wound around a connecting portion between a pair of leg portions 16a and 16b of a C-shaped iron core 16. It is configured. The dimension between the inside of the pair of leg portions 16a, 16b is smaller than the dimension in the circumferential direction of the permanent magnet 3 (the direction along the circumferential direction of the flywheel) , and the dimension between the outside of the pair of leg portions 16a, 16b is The permanent magnet 3 is formed larger than the circumferential dimension.
[0015]
In order to transmit magnetic force from the specific permanent magnet 3 on the inner periphery of the cylindrical portion 2a of the flywheel 2 to the pair of leg portions 16a and 16b of the iron core 16, a part (specific ) Three concave and convex portions 18, 19, 20 for applying the magnetic force of the permanent magnet 3, the concave portions 18 a, 19 a, 20 a are recessed in the outer surface of the cylindrical portion 2 a, and the convex portions 18 b, 19 b, 20 b are It protrudes from the inner surface of the cylinder part 2a. In other words, the concavo-convex portions 18, 19, and 20 are provided in an unpenetrated state from the outer surface to the inner surface of the cylindrical portion 2 a of the flywheel 2. Further, among the concavo-convex portions 18, 19, and 20, the concavo-convex portions 18 and 20 are disposed on both sides in the circumferential direction of some of the permanent magnets 3, and a plurality of convex portions 18b and 20b that protrude to the inner periphery of the cylindrical portion 2a are These are provided between a plurality of permanent magnets 3 fixed to the inner periphery of the cylindrical portion 2a of the flywheel 2. The central concavo-convex portion 19 is provided on the end side in the longitudinal direction of the permanent magnet 3 (the direction along the axis of the flywheel) so as to connect one end of the concavo-convex portions 18 and 20. The other ends of the concave portions 18a and 20a of the concave and convex portions 18 and 20 are opened at the opening end of the cylindrical portion 2a.
[0016]
If the uneven portions 18, 19, 20 are provided in this way, the magnetic lines of force from the vicinity of the center of the N pole on the outer peripheral side of the central permanent magnet 3 in FIG. 4 come out from the concave portion 19 a of the central uneven portion 19. Thus, the concave portions 18a and 20a of the left and right concave and convex portions 18 and 20 reach the outer peripheral side S pole of the left and right permanent magnets 3 through the cylindrical portion 2a.
[0017]
When the flywheel 2 rotates, the magnetic lines of force that have come out of the cylindrical portion 2a also rotate together, and the primary coil 17a generates power each time it faces the pair of leg portions 16a, 16b of the iron core 16.
[0018]
As shown in FIG. 7, the internal combustion engine ignition device 14 has electric wires 21 and 22 connected to both ends of the primary coil 17 a of the internal combustion engine ignition device power generation unit 15, respectively, and the emitters of the transistors 23 and 24 are connected to the electric wire 21. The collector of the transistor 23 and the collector of the transistor 24 are connected to the connected and grounded wire 22 via the resistor 25. The base of the transistor 23 is connected to the collector of the transistor 24, and the base of the transistor 24 is connected to a connection point of resistors 26 and 27 connected in series between the wires 21 and 22. Both ends of the secondary coil 17 b of the power generation unit 15 for the internal combustion engine ignition device are connected to both ends of the spark plug 28.
[0019]
In such an internal combustion engine ignition device 14, the flywheel 2 rotates and the magnetic flux leakage portion formed by the uneven portions 18, 19, 20 is one leg portion 16 a of the iron core 16 of the internal combustion engine ignition device power generation portion 15. First, a voltage is generated in the primary coil 17a of the power generation unit 15 so that the emitter side of the transistor 23 becomes a positive potential, the transistors 23 and 24 do not operate, and then the magnetic flux leakage portion is the other leg of the iron core 16. When approaching the part 16b, the direction of the lines of magnetic force flowing through the C-shaped iron core 16 is reversed, a reverse voltage is generated, the collector side of the transistor 23 becomes a positive potential, the transistor 23 becomes conductive, and the primary coil 17a becomes primary. Current flows. Then, as the magnetic flux leakage part approaches the leg 16b, the collector-emitter potential of the transistor 23 gradually rises, and when the base voltage of the transistor 24 divided by the resistors 26 and 27 reaches the trigger voltage, the transistor 24 becomes conductive. Then, the transistor 23 is turned off, and the primary current flowing through the primary coil 17a of the power generation unit 15 is instantaneously interrupted. As a result, a high voltage pulse is induced in the secondary coil 17b of the power generation unit 15, and the spark plug 28 Generates a spark and the internal combustion engine is ignited.
[0020]
【The invention's effect】
In the ignition device for an internal combustion engine according to the present invention, the magnetic force of the permanent magnet fixed to the inner periphery of the cylinder portion of the flywheel is applied to the power generation portion for the internal combustion engine ignition device disposed opposite to the outer periphery of the cylinder portion. For this purpose, there is an uneven portion provided in the cylindrical portion of the flywheel, and this uneven portion is provided with the concave portion recessed on the outer surface of the cylindrical portion and the convex portion protruding from the inner surface of the cylindrical portion. Therefore, it is not a slit hole (transparent window) as in the prior art, and therefore the generation of wind noise when the flywheel is rotated can be suppressed. Moreover, since the convex part of the inner periphery of the cylinder part of a flywheel is provided between the some permanent magnets of the inner periphery of the cylinder part of a flywheel, positioning of a permanent magnet can also be performed easily.
[0021]
In addition, the concavo-convex portion formed on the cylindrical portion of the flywheel is composed of a plurality of concavo-convex portions, and all the concavo-convex portions are provided in an unpenetrated state from the outer surface to the inner surface of the cylindrical portion of the flywheel. The generation of wind noise when the flywheel is rotated can be suppressed.
[0022]
Further, when the plurality of convex portions protruding to the inner periphery of the cylindrical portion are provided between the plurality of permanent magnets fixed to the inner periphery of the cylindrical portion of the flywheel, the convex portion is easily formed. be able to.
[Brief description of the drawings]
FIG. 1 is an example of an embodiment of an ignition device for an internal combustion engine according to the present invention, and is a cross-sectional view of an essential part showing the structure of the ignition device for an internal combustion engine of this example assembled to an external rotation internal combustion engine drive power generation device; FIG.
FIG. 2 is an example of an embodiment of an ignition device for an internal combustion engine according to the present invention, and is a longitudinal sectional view of a main part showing the structure of the ignition device for an internal combustion engine of this example assembled to an external rotation internal combustion engine drive power generation device; FIG.
FIG. 3 is a plan view of the external rotation internal combustion engine drive power generator.
FIG. 4 is an enlarged view of a main part of FIG.
FIG. 5 is an enlarged view of a main part of FIG. 3;
FIG. 6 is a circuit diagram of a power generation circuit of the abduction type internal combustion engine drive power generation device shown in FIG. 1;
FIG. 7 is a circuit diagram of an ignition device for an internal combustion engine of the present example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 External rotation type internal combustion engine drive power generator 2 Flywheel 2a Tube part 2b Bottom plate 2c Boss part 3 Permanent magnet 4 Rotor 5 Stator iron core 5a Convex pole 6 Generator coil 6a-6c Generator coil 7 Stator 8 Diode 9 Three-phase full-wave rectifier circuit DESCRIPTION OF SYMBOLS 10 Regulator 11 Inverter 12 Power supply circuit 13 Three-phase half-wave rectifier circuit 14 Internal combustion engine ignition device 15 Internal combustion engine ignition device power generation part 16 Iron core 16a, 16b Leg part 17 Coil 17a Primary coil 17b Secondary coil 18, 19, 20 Uneven portion 18a, 19a, 20a Recessed portion 18b, 19b, 20b Convex portion 21, 22 Electric wire 23, 24 Transistor 25-27 Resistance 28 Spark plug

Claims (1)

A rotor in which a plurality of permanent magnets (3) are fixed in the circumferential direction on the inner periphery of a cylindrical portion (2a) of a flywheel (2) that is rotationally driven by an internal combustion engine, and an internal space facing these permanent magnets. An abduction type internal combustion engine drive power generation device having a stator (7) in which a power generation coil is wound around a plurality of convex poles of a stator iron core (16) is used, and is disposed to face the outer periphery of the cylindrical portion of the flywheel. In the internal combustion engine ignition device including the internal combustion engine ignition device power generation section (15) that generates power every time it faces a part of the permanent magnets (3) of the plurality of permanent magnets ,
In order to apply the magnetic force of a part of the permanent magnets (3) among the plurality of permanent magnets fixed to the inner periphery of the cylinder portion of the flywheel to the internal combustion engine ignition device power generation unit (15), the flywheel On the cylindrical portion (2a) of the wheel, the concave and convex portions (18, 20) disposed on both sides in the circumferential direction of the partial permanent magnet (3) and the concave and convex portions on the longitudinal end side of the partial permanent magnet. A plurality of concavo-convex portions formed with the concavo-convex portions (19) provided so as to connect between the portions 18 and 20,
Each of the plurality of concave and convex portions (18, 19, 20) includes a recess (18a, 19a, 20a) formed by recessing an outer surface of the cylindrical portion (2a) of the flywheel, and the cylindrical portion (2a). ) Projecting from the inner periphery of the flywheel (18b, 19b, 20b), and all the uneven portions (18, 19, 20) are not directed from the outer surface to the inner surface of the cylindrical portion of the flywheel. Being provided in a penetrating state,
An ignition device for an internal combustion engine.

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