JP3500958B2 - Flywheel magnet generator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel magnet generator installed in an internal combustion engine.

[0002]

2. Description of the Related Art A flywheel magnet generator is often used as a generator mounted on an internal combustion engine.
The flywheel magnet generator includes a peripheral wall portion, a bottom wall portion provided to close one end side in the axial direction of the peripheral wall portion, and a central wall portion of the bottom wall portion so as to project to the other end side of the peripheral wall portion. A flywheel including a provided boss portion and a crankshaft fitting hole having a key groove formed inside the boss portion, and a magnet configured by attaching a ferrite magnet to an inner circumference of a peripheral wall portion of the flywheel. A field magnet and a stator formed by winding a generator coil around an armature core having a magnetic pole portion facing the magnet field inside the flywheel.
The output of this generator is an internal combustion engine ignition device, a lighting load, various control units for controlling the fuel injection device, and the like,
It is used to drive various loads such as a battery charging circuit.

In some cases, a generator for ignition is constructed on the outer peripheral side of the flywheel in order to obtain a voltage for driving the ignition device for an internal combustion engine. This ignition generator includes an ignition magnet field formed by mounting an ignition permanent magnet in a recess provided on the outer circumference of a peripheral wall of a flywheel, and a magnetic pole portion facing the ignition magnet field. And an ignition stator formed by winding an ignition power generation coil around an ignition armature core having an ignition armature core, and inducing a voltage for driving the ignition device in the ignition power generation coil in synchronization with the rotation of the engine. To do. The ignition power generation coil normally comprises an ignition coil having a primary coil and a secondary coil having a larger number of turns than the primary coil, and the internal combustion engine is constituted by the ignition coil and an ignition circuit for controlling the current of the primary coil. The ignition device is configured.

The ignition generator constructed on the outer peripheral side of the flywheel as described above is called a magneto.

A flywheel magnet generator mounted on an internal combustion engine is used to drive an electrical component attached to the internal combustion engine or an electrical component mounted on a vehicle driven by the internal combustion engine. With the increasing number of items, it is becoming necessary to increase the output of generators. Also, with the output of the flywheel magnet generator installed in the engine, not only the electrical components attached to the engine,
It may be desirable to be able to drive external loads as well.

In a flywheel magnet generator using a ferrite magnet as a permanent magnet constituting a magnet field,
In order to increase the output, it is conceivable to increase the volume of the magnet to increase the amount of magnetic flux interlinking with the generator coil, but if the magnet is made large, a flywheel with a large diameter is used. It is not preferable because the size of the generator becomes large. Especially when arranging the ignition stator on the outer peripheral side of the flywheel to configure the magneto, avoid increasing the diameter of the flywheel as much as possible to prevent the flywheel magnet generator from becoming large There is a need.

Therefore, it has been considered to use a rare earth magnet having a larger coercive force than a ferrite magnet as a permanent magnet forming a magnet field on the inner peripheral side of the peripheral wall of the flywheel.

[0008]

When attaching the flywheel magnet generator to the engine, first, after attaching the stator to be arranged inside the flywheel to the attachment portion provided in the case of the engine, The flywheel is attached to the engine by fitting the tapered portion provided at the tip of the crankshaft of the engine into the tapered hole inside the boss provided at the center of the peripheral wall of the flywheel.

In this type of generator, in order to make it possible to perform the ignition operation at a predetermined rotational angle position of the engine, the ignition device is installed at a position advanced by a predetermined angle with respect to the top dead center of the engine. It is necessary that the generator coil for driving induces a voltage. Therefore, the key groove and the key are provided in the tapered hole inside the boss portion of the flywheel and the tapered portion of the crank shaft of the engine so as to have a predetermined positional relationship, and the key groove and the key are fitted together. The flywheel is thereby positioned at a predetermined position.

Therefore, in this kind of generator, when the flywheel is attached to the engine, the key groove provided inside the boss portion of the flywheel is located on the crankshaft side of the engine. It is necessary to fit the boss part to the tip of the crankshaft in accordance with the position of, but at this time the boss part is inside the flywheel and hidden from the operator's eyes by the bottom wall part. Since it is in the state, the work of aligning the position of the key groove on the inner side of the boss portion with the key on the side of the crankshaft is manually performed, and there is a problem that the work is extremely difficult to perform. In particular, when a rare earth magnet is used as a permanent magnet that constitutes the field of a magneto generator, the magnet has a very strong attracting force. When the flywheel is attached to the magnetic pole, the magnet may hit the iron core and be damaged during the process of attaching the flywheel. If the magnet is attracted to the iron core when installing the flywheel, it will be very difficult to align the key groove on the boss with the key on the crankshaft. The flywheel may be forcibly assembled without being properly aligned with the key, and the key and keyway may be damaged.
Due to damage to the key and the key groove, the attachment position of the flywheel may deviate from the proper position, and it may not be possible to obtain a predetermined ignition performance.

An object of the present invention is to provide a flywheel magnet which is small in size and capable of obtaining a high output, and which is capable of easily attaching a flywheel to an engine without damaging the magnet or the keyway. To provide a generator.

[0012]

A flywheel magnet generator to which the present invention is directed is directed to a peripheral wall portion, a bottom wall portion provided so as to close one end side in the axial direction of the peripheral wall portion, and the bottom wall portion. A flywheel having a boss portion provided so as to project from the central portion to the other end side of the peripheral wall portion, and a crankshaft fitting hole having a key groove formed inside the boss portion; and a rare earth magnet And a stator formed by winding a generator coil around an armature core having a magnetic pole portion facing the magnet field inside the flywheel. There is. The flywheel is constructed by fitting the crankshaft of the internal combustion engine into the crankshaft fitting hole provided in the boss and inserting the key provided on the crankshaft side into the key groove of the crankshaft fitting hole. It is attached to the crankshaft.

In the present invention, a mark indicating the position of the key groove is formed on the outer peripheral portion of the boss portion of the flywheel at a position corresponding to the key groove of the crankshaft fitting hole. Further, a window portion is formed for allowing the mark to be viewed from the outside of the flywheel in a state where a portion of the bottom wall portion of the flywheel located near the mark is penetrated.

The present invention also relates to an ignition armature iron core having an ignition magnet field formed on an outer peripheral portion of a peripheral wall portion of a flywheel and a magnetic pole portion facing the ignition magnet field, and an ignition generator coil. An ignition stator formed by winding a magnet, a magnet generator magnet field formed on the inner circumference of the peripheral wall of the flywheel using a rare earth magnet, and a magnet generator magnet field inside the flywheel. A stator for a magnet generator, which is formed by winding a generator coil for a magnet generator around an armature core for a magnet generator having opposing magnetic poles, and an internal combustion engine using an ignition magnet field and an ignition stator. A magnet for generating a voltage for driving an ignition device for a vehicle, and a generator for supplying electric power to a load other than the ignition device for an internal combustion engine by a magnet field for a magnet generator and a stator for a magnet generator. The integrated magneto flywheel It can be applied to magneto generator.

With the above construction, the boss is aligned by aligning the mark on the crankshaft side key while visually observing the mark provided on the boss through the window provided on the bottom wall of the flywheel. Since the key groove of can be aligned with the key position on the crankshaft side, the key groove position and the key position can be accurately aligned without the need to search for the position where the key groove and key match. The flywheel can be attached to the crankshaft with. Therefore, it takes time to align the key and the key groove, and the magnet is damaged, or the flywheel is forcibly attached and the key and the key groove are damaged when the key and the key groove are not aligned properly. Can be prevented.

Therefore, according to the present invention, in order to obtain a high output with a small size, a rare earth magnet is used as a permanent magnet constituting a magnet field, and a flywheel is used as an engine without damaging the magnet or the key groove. It is possible to obtain a flywheel magnet generator that can be easily attached to.

[0017]

1 to 4 show an example of the configuration of a flywheel magnet generator according to the present invention. FIG. 1 is a front view of the same generator, FIG. 2 is a rear view, and FIG. 2A
FIG. Further, FIG. 4 is a perspective view of a main part of the generator.

In FIGS. 1 to 3, reference numeral 1 denotes a cast iron flywheel formed to have a substantially cup shape.
This flywheel 1 includes a bottom wall portion 1 provided so as to close a peripheral wall portion 1a and one end side of the peripheral wall portion 1a in the axial direction.
b and a boss portion 1c provided so as to project from the central portion of the bottom wall portion 1b to the other end side of the peripheral wall portion 1a. A crankshaft fitting hole 1d is formed inside the boss portion 1c in such a manner that the diameter gradually decreases toward the bottom wall portion 1b side, with the central wall line shared with the peripheral wall portion 1a. A key groove 1d1 extending in the axial direction is formed in a part of the shaft fitting hole 1d. Flywheel 1
On the outer surface of the bottom wall portion 1b, a large number of blower blades 1e arranged integrally at a constant interval in the circumferential direction of the flywheel are integrally formed.

As shown in FIGS. 1 and 3, a projection 1f is formed on a portion of the outer surface of the bottom wall 1b of the flywheel 1 corresponding to the boss 1c.
One screw hole 1g is formed at 120 degree intervals. These screw holes are used for attaching a punching tool used when pulling out the flywheel from the crankshaft of the engine.

Bottom wall 1 of peripheral wall 1a of flywheel 1
A thick portion 1a1 extending over the entire circumferential direction of the flywheel is formed at a portion near b, and a magnet mounting recess 1h is formed at a part of the thick portion 1a1. One magnetic pole surface of the ignition permanent magnet (ferrite magnet) 2 is brought into contact with the bottom of the magnet mounting recess 1h via an adhesive, and the other magnetic pole surface of the permanent magnet 2 is adhered via an adhesive to the magnetic pole piece. 3 is abutted. A bolt 4 that penetrates the pole piece 3 and the permanent magnet 2.
(See FIG. 3) is screwed into the peripheral wall portion 1a, and the bolts 4 are tightened and bonded between the permanent magnet 2 and the bottom surface of the magnet mounting recess 1h and between the permanent magnet 2 and the pole piece 3. The permanent magnet 2 and the pole piece 3 are fixed to the flywheel 1 by the agent. One magnetic pole (N pole in the illustrated example) of the permanent magnet 2 facing outward in the radial direction of the flywheel 1 and the other magnetic pole of the magnet 2 led to the outer peripheral portions on both sides of the recess 1h of the flywheel (illustrated). In the example, S
Poles), a three-pole ignition magnet field is formed on the outer peripheral portion of the flywheel 1. An ignition stator 5 is arranged on the outer peripheral side of the flywheel. The ignition stator 5 is
It is provided with a U-shaped ignition armature iron core 6 having magnetic pole portions 6a, 6a at both ends, and an ignition power generation coil wound around the iron core 6. In the illustrated example, this ignition power generation coil is composed of an ignition coil having a primary coil and a secondary coil, and the whole thereof is covered with a resin mold portion 7. A high-voltage cord connecting portion 7a is provided in a portion near the outer periphery of the resin mold portion 7, and a high-voltage cord 8 in which the end portion of the secondary coil of the ignition coil is connected to the high-voltage cord connecting portion 7a.
Through a spark plug attached to a cylinder of an engine (not shown). The primary coil of the ignition coil is connected to the ignition unit through a lead wire (not shown) drawn from the resin mold portion 7.

The ignition stator 5 is fixed to mounting portions provided on the cylinder of the internal combustion engine by screws inserted into mounting holes 6b, 6b formed at both ends of the iron core 6, and magnetic pole portions at both ends of the iron core 6 are secured. 6a and 6a are opposed to the ignition magnet field formed on the outer periphery of the hula wheel.

The 3-pole ignition magnet field formed by the permanent magnet 2 and the ignition stator 5 constitute a magnet for generating a voltage for driving the ignition device for an internal combustion engine.

In this example, the primary coil of the ignition coil wound around the armature core 6 also serves as the ignition power generation coil, and an AC voltage is induced in the primary coil in synchronization with the rotation of the engine. The ignition unit controls the current flowing through the primary coil of the ignition coil to cause a rapid change in the current at the ignition timing of the engine, thereby generating a high voltage for ignition in the secondary coil of the ignition coil. The high voltage for ignition obtained from the ignition coil is applied to the spark plug through the high voltage cord 8.

On the inner peripheral side of the flywheel 1, a magnet field 10 for a magnet generator is constructed. A magnet field 10 for a magneto-generator includes a yoke 11 fixed to the inner circumference of a peripheral wall portion 1a of a flywheel, the yoke 11 being formed in an annular shape by a magnetic material having better magnetic characteristics than cast iron forming the flywheel 1.
A rectangular shape (rectangular shape) having the same size and shape of n pieces (n is an even number of 2 or more, n = 16 in the illustrated example) arranged side by side on the inner circumference of the yoke 11 at equal angular intervals and fixed to the yoke by adhesion. ) It is composed of a plate-shaped rare earth magnet 12. In the portion of the inner peripheral portion of the yoke 11 located between the rare earth magnets 12, 12, ... Extends in the axial direction of the yoke, and the width dimension of the openings is the distance between the magnets (adjacent rare earth magnets 12, 12, Grooves 13, 13, ... Which are substantially equal to the distance W between adjacent ends of 12) (see FIG. 2) are formed.

A magnetic material having magnetic properties superior to that of cast iron is a material capable of flowing a larger amount of magnetic flux than cast iron and having less iron loss, that is, a saturated magnetic flux density and magnetic permeability higher than that of cast iron. It means a magnetic material having a high holding power and a small holding power.

The yoke 11 shown in the drawing is formed by laminating a predetermined number of silicon steel plates punched into an annular shape that fits around the inner periphery of the peripheral wall portion of the flywheel 1 with almost no gap. It is press-fitted onto the inner circumference of the peripheral wall portion 1a and is fixed to the flywheel.

Inside the flywheel 1, a stator 15 for a magneto generator is arranged. The stator 15 is an annular star-shaped iron core (annular joint) having m (m is an even number of 2 or more, m = 24 in the illustrated example) magnetic pole portions facing the magnet field 10 formed of a rare earth magnet. An armature core 16 for a magnet generator, which is composed of iron cores formed by radially projecting m salient pole portions from the outer peripheral portion of the iron portion, and a three-phase connected winding coil 17 wound around the armature core 16. The armature core 16 is fastened to a mounting portion provided in the crankcase of the internal combustion engine by a bolt (not shown). A magnet generator for generating a voltage for driving a load other than the ignition device is constituted by the magnet field 10 for the magnet generator and the stator 15.

The flywheel 1 is attached to the crankshaft of the internal combustion engine after the stator 15 for the magnet generator is attached to the engine. In order to facilitate the work of attaching the flywheel 1 to the crankshaft, in the present invention, a key groove is provided at a position corresponding to the key groove 1d1 of the crankshaft fitting hole 1d on the outer peripheral portion of the boss portion 1c of the flywheel 1. A mark 20 indicating the position of is formed. In the illustrated example, the mark 20 is a protrusion formed on the outer periphery of the boss 1c. Further, the mark 2 on the bottom wall portion 1b of the flywheel 1
A window portion 21 is formed so that the mark 20 can be seen from the outside of the flywheel in a state where a portion located near 0 is penetrated. In the illustrated example, the bottom wall portion 1b of the flywheel
Further, two window portions 22 and 23 are provided outside the window portion 21. The three windows 21 to 23 are provided at intervals of 120 degrees, and outside air is introduced into the inside of the flywheel through these windows 21 to 23. The window portion 21 also serves as a sight window for the mark 20 and an inlet for cooling air.

Since the rare earth magnet has a very large holding force,
A large amount of magnetic flux can be generated with a small plate magnet having a small thickness. Therefore, when the magnet field of the magneto-generator is configured by using the rare earth magnet as described above, the flywheel 1 having the same size as that conventionally used and the armature for the magneto-generator are used. It is possible to obtain an output that is at least twice the output obtained from a conventional magneto-generator that uses a ferrite magnet without increasing the size.

Since the rare earth magnet 12 requires a large amount of magnetizing energy when it is magnetized, and requires a large magnetizer to magnetize it, after attaching the rare earth magnet to the inner circumference of the yoke 11. It is often difficult to magnetize. Therefore, the rare earth magnet 12 is preferably magnetized in advance before being attached to the inner circumference of the yoke.

When assembling the above generator, first, the stator of the magnet generator was provided in the case of the engine or the like with the axis of the stator 15 aligned with the central axis of the crankshaft of the engine. Fix to the mounting part.

Next, as shown in FIG. 4, while visually observing the mark 20 on the outer periphery of the boss 1c through the window 21 of the flywheel 1, bring the boss 1c close to the crankshaft 30 of the internal combustion engine, and position the mark 20. It is aligned with the position of the key 31 provided on the tapered portion 30a at the tip of the crankshaft 30. Then, while keeping the position of the mark 20 aligned with the position of the key 31, the tapered portion 30a at the tip of the crankshaft 30 is fitted into the tapered hole 1d inside the boss portion 1c, and the key 31 is inserted.
Is fitted into the keyway 1d1 of the tapered hole 1d, and the crankshaft 3
A nut (not shown) is screwed into a threaded portion 30b (see FIG. 3) provided at the tip of the flywheel 0 to fasten the flywheel 1 to the crankshaft 30.

Instead of providing the screw portion 30b at the tip of the crankshaft 30 as described above, a screw hole opened at the tip of the crankshaft 30 is provided at the shaft core portion of the crankshaft 30, and a bolt is inserted in the screw hole. The flywheel 1 may be fastened to the crankshaft 30 by screwing.

As described above, the mark 20 is provided at a position corresponding to the key groove 1d1 of the boss portion 1c of the flywheel 1, and the window portion 21 for visually observing the mark 20 is provided on the bottom wall portion 1b of the flywheel. That is, the mark 2 provided on the boss 1b from the window 21 provided on the bottom wall of the flywheel.
While visually observing 1, check the mark on the key 3 on the crankshaft 30 side.
The key groove 1 of the boss portion 1c
It is possible to match d1 with the position of the key 31 on the crankshaft side. Therefore, the flywheel 1 can be attached to the crankshaft 30 in a state where the position of the key groove and the position of the key are accurately aligned without performing a work for finding a position where the key groove 1d1 and the key 31 are aligned with each other. Therefore, it takes time to align the key and the key groove, and the magnet is damaged,
It is possible to prevent the flywheel from being forcibly attached to the key and the keyway in a state where the key and the keyway are not properly aligned with each other.

As in the above example, the rare earth magnets 12, 12, are provided on the inner circumference of the annular yoke 11 made of a laminated body of steel plates having magnetic properties superior to those of the material forming the flywheel (cast iron in the above example). Is attached, and the yoke 11 is fitted and fixed to the inner circumference of the peripheral wall portion of the flywheel 1 to form the magnet field 10 on the inner circumference of the flywheel. The magnetic resistance of the passage (yoke) of the magnetic flux generated from the rare-earth magnet 12 can be reduced as compared with the case of directly fixing to the inner circumference of the wheel, so that the power generation performance can be improved.

Since the rare earth magnet 12 has a small thickness, the leakage magnetic flux easily flows from the N pole to the S pole at both widthwise ends thereof. When this leakage magnetic flux increases, the amount of magnetic flux interlinking with the power generation coil decreases, so that the power generation performance deteriorates. In the above example, the groove 13 having a width dimension substantially equal to the width dimension of the gap formed between the rare earth magnets is formed in a portion located between the rare earth magnets on the inner circumference of the yoke 11 to form a groove of each rare earth magnet. By increasing the magnetic resistance of the leakage magnetic paths formed at both ends in the width direction, the amount of leakage magnetic flux is reduced and the power generation performance is improved.

In the above example, the ignition coil composed of the primary coil and the secondary coil is wound around the ignition armature core 6,
Although the primary coil of the ignition coil also serves as the ignition power supply coil, the ignition stator 5 may be any one that has an ignition power supply coil that induces a voltage for driving the ignition device. The ignition coil may be provided outside the magnet so that only the ignition power supply coil is wound around the ignition armature core 6. In the above example, the yoke 11 is pressure-fitted to the inner circumference of the peripheral wall portion of the flywheel 1, but the yoke 11 may be fitted and fixed to the inner circumference of the peripheral wall portion of the flywheel. You may make it fit in the inner periphery of the peripheral wall part of a wheel, and may be fixed to this flywheel by adhesion.

In the above example, the flywheel is made of cast iron, but the present invention can also be applied to the case of using a flywheel manufactured by drawing an iron plate. When a flywheel formed by drawing is used, if an iron plate having good magnetic characteristics is used as the material of the flywheel, the flywheel can be formed without fitting a yoke to the inner circumference of the peripheral wall portion of the flywheel. Even with the structure in which the rare earth magnet is directly adhered to the inner circumference of the peripheral wall portion, it is possible to obtain the same power generation performance as when the yoke 11 is provided as in the above example. Even when using a flywheel drawn using an iron plate with good magnetic properties, if the thickness of the peripheral wall of the flywheel is small, an annular yoke is fitted and fixed to the inner periphery of the peripheral wall of the flywheel. Therefore, it is preferable to adopt a structure in which a rare earth magnet is bonded to the inner circumference of the yoke.

Even when a flywheel made of an iron plate having good magnetic characteristics is used, an annular yoke is fitted and fixed to the inner circumference of the peripheral wall of the flywheel, and the rare earth magnet 12 is bonded to the inner circumference of the yoke. In addition, when the groove 13 having a width dimension substantially equal to the width dimension W of the gap formed between the rare earth magnets 12 is formed, the amount of leakage magnetic flux generated from the magnet 12 is reduced and the power generation performance is further enhanced. be able to.

The "voltage for driving the ignition device for the internal combustion engine" means a voltage used in some form for operating the ignition device for the internal combustion engine, and is directly applied to the ignition device for the internal combustion engine as a power supply voltage. It is not limited to the applied voltage. For example, when an internal combustion engine ignition device that operates using a battery as a power source is used, the voltage used to charge the battery is the “voltage for operating the internal combustion engine ignition device”.

In the above example, the groove 13 extending in the axial direction of the flywheel is formed in the inner peripheral portion of the yoke 11 located between the rare earth magnets 12, 12, ... It may be provided in a state of being extended (skewed) in a direction inclined with respect to the axis direction of. When the groove 13 is skewed, a rare earth magnet 12 having a shape in which a plate having an outline parallelogram is curved so as to form a part of a cylinder along the inner circumference of the peripheral wall portion of the flywheel is provided in the yoke 11. The magnetic field 10 for the magneto generator is formed by sticking the magnetic field to the circumference.

In the above example, the ignition magnet field is constructed by mounting the ignition permanent magnet 2 in the recess provided in the outer peripheral portion of the flywheel 1, and the ignition magnet field opposed to the ignition magnet field is formed. The stator 5 is provided so as to form a magnet for generating a voltage for driving the ignition device for the internal combustion engine. However, a coil for generating a voltage for driving the ignition device is provided for the stator 15 for the magneto generator. When winding, the magneto can be omitted.

[0043]

As described above, according to the present invention, while visually checking the mark provided on the boss through the window provided on the bottom wall of the flywheel, the mark is positioned at the key position on the crankshaft side. By aligning, the key groove on the boss can be aligned with the key position on the crankshaft side, so the key groove position and the key position can be determined without the need to search for a position where the key groove and key match. The flywheel can be attached to the crankshaft in the state where it is accurately aligned. Therefore, it takes time to align the key and the key groove, and the magnet is damaged, or the flywheel is forcibly attached and the key and the key groove are damaged when the key and the key groove are not aligned properly. Can be prevented. Therefore, according to the present invention, in order to obtain a high output with a small size, a rare earth magnet is used as a permanent magnet constituting a magnet field,
Moreover, it is possible to obtain a flywheel magnet generator capable of easily performing the work of attaching the flywheel to the engine without damaging the magnet or the key groove.

[Brief description of drawings]

FIG. 1 is a front view showing a configuration example of a flywheel magnet generator according to the present invention.

2 is a rear view of the generator of FIG. 1. FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view of a main part for explaining a state when the flywheel of the generator shown in FIGS. 1 to 3 is attached to a crankshaft of an engine.

[Explanation of symbols]

1 ... Flywheel, 1a ... Peripheral wall part, 1b ... Bottom wall part, 1
c ... Boss portion, 1h ... Recessed portion formed on outer periphery of flywheel, 2 ... Ignition permanent magnet, 3 ... Magnetic pole piece, 5 ... Ignition stator, 6 ... Ignition armature core, 7 ... Mold portion, 10 …
Magnet field for magnet generator, 11 ... Yoke, 12 ... Rare earth magnet, 13 ... Groove, 15 ... Magnet generator stator, 16 ... Magnet generator armature core, 17 ... Generator coil, 20 ... Mark,
21 ... Window.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-60-223455 (JP, A) JP-A-8-93497 (JP, A) JP-A-7-264826 (JP, A) JP-A-1- 142265 (JP, A) Actually open 61-22171 (JP, U) Actually open 54-22111 (JP, U) Actually open 3-74157 (JP, U) Actually open 1-157756 (JP, U) Jitsukaihei 1-105366 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 21/22

Claims (2)

(57) [Claims] 1. A peripheral wall part, a bottom wall part provided so as to close one end side of the peripheral wall part in the axial direction, and a bottom wall part provided so as to project from the central part of the bottom wall part to the other end side of the peripheral wall part. A flywheel in which a crankshaft fitting hole having a key groove is formed inside the boss portion, and a magnet formed on the inner circumference of the peripheral wall portion of the flywheel using a rare earth magnet. A crankshaft provided with a field and a stator formed by winding a magneto coil on an armature core having a magnetic pole portion facing the magnet field inside the flywheel, and provided on a boss portion of the flywheel. A flywheel magnet in which a crankshaft of an internal combustion engine is fitted in the fitting hole, and a key provided on the crankshaft side is inserted into a key groove of the crankshaft fitting hole to attach the flywheel to the crankshaft. To the generator In the outer peripheral portion of the boss portion of the flywheel, a mark indicating the position of the key groove is formed at a position corresponding to the key groove of the crankshaft fitting hole, and the mark of the bottom wall portion of the flywheel is formed. A flywheel magnet generator, wherein a window portion for visually observing the mark from the outside of the flywheel is formed in a state where a portion located in the vicinity of is penetrated. 2. A peripheral wall part, a bottom wall part provided so as to close one end side of the peripheral wall part in the axial direction, and a bottom wall part provided so as to project from the central part of the bottom wall part to the other end side of the peripheral wall part. And a flywheel in which a crankshaft fitting hole having a key groove is formed inside the boss portion, and an ignition magnet field formed in an outer peripheral portion of a peripheral wall portion of the flywheel. An ignition stator having an ignition armature core wound around an ignition armature core having a magnetic pole portion facing the ignition magnet field, and a rare earth magnet on the inner circumference of a peripheral wall portion of the flywheel. A formed magnet field for a magnet generator and a magnet generator armature core having a magnetic pole portion facing the magnet field for the magnet generator inside the flywheel, and winding a magnet generator generator coil around the armature core. And a stator for a magnet generator, A magnet for generating a voltage for driving an ignition device for an internal combustion engine by a magnet field and an ignition stator, and for the internal combustion engine by the magnet generator magnet field and the magnet generator stator. Magnet generators for supplying electric power to loads other than the ignition device are respectively configured, and the crankshaft of the internal combustion engine is fitted in the crankshaft fitting hole provided in the boss portion of the flywheel, and the crankshaft fitting is performed. A flywheel magnet generator in which a key provided on the crankshaft side is inserted into a keyway of a dowel hole, and the flywheel is attached to the crankshaft, wherein the crankshaft is fitted on an outer peripheral portion of a boss portion of the flywheel. A mark indicating the position of the key groove is formed at a position corresponding to the key groove of the hole, and a portion of the bottom wall portion of the flywheel located near the mark is penetrated. In state, the flywheel magneto generator, wherein a window for viewing said mark from the outside of the flywheel is formed.