JPS645978Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flywheel magnet generator attached to an internal combustion engine.

[Prior Art] A flywheel magnet generator attached to an internal combustion engine that drives a vehicle such as a motorcycle consists of a flywheel magnet rotor attached to the rotating shaft of the engine, and a flywheel magnet rotor attached to the engine case or cover. Consisting of a stator fixed to the stator mounting part,
The rotor and stator are often located within the case or cover of the internal combustion engine. In this case, the space inside the flywheel where the generating coil is placed has poor heat dissipation and heat tends to accumulate, which increases the temperature of the generating coil, making it difficult to design its insulation, and causing the generator to become larger. There were some drawbacks. Therefore, the stator is attached to the engine cover side to dissipate heat, or the stator is immersed in oil to cool the coil, but in this case too, each part of the generating coil is Heat dissipation was particularly poor in the inner part of the flywheel (near the bottom wall), making it unavoidable that the temperature of the generating coil would rise.

[Object of the invention] An object of the invention is to provide a flywheel magnet generator that eliminates the above-mentioned drawbacks by preventing heat from accumulating inside the flywheel.

[Structure of the invention] The present invention has a flywheel formed in a substantially cup shape and a flange part integrally formed at one end of a boss part for attaching a rotary shaft, and the flange part comes into contact with the outer surface of the bottom wall of the flywheel. a flywheel magnet rotor comprising a boss member attached to the flywheel in a state of being in contact with the permanent magnet and a permanent magnet attached to the inner surface of the peripheral wall of the flywheel; A flywheel magnet generator for an internal combustion engine includes an iron core having a magnetic pole part and a stator having a power generating coil wound around the iron core and disposed inside the flywheel. A plurality of grooves extending in the radial direction of the flywheel and opening toward the outer circumferential side of the flywheel are provided in the flange portion of the boss member, and holes penetrating the bottom wall portion of the flywheel and communicating with the grooves are provided. It is provided.

[Operation of the invention] In the above-mentioned configuration, the grooves in the flange of the boss member are arranged in the radial direction (in the radial direction of the flywheel) and open to the outer periphery of the flywheel, so that the cooling medium (air or oil) located in the grooves in the flange of the boss member is blown outward in the radial direction by centrifugal force as the flywheel rotates. Therefore, a flow of cooling medium toward the outside in the radial direction is generated in each groove in the flange of the boss member, which generates a suction force that sucks the cooling medium inside the flywheel to the outside of the flywheel through the grooves and the holes in the bottom wall of the flywheel. Therefore, the cooling medium located deep inside the flywheel is continuously discharged to the outside of the flywheel through the holes in the bottom wall of the flywheel and the grooves in the flange of the boss member, improving the circulation (circulation) of the cooling medium inside and outside the flywheel and preventing heat from accumulating inside the flywheel. Therefore, heat dissipation from the generating coil can be improved, and the risk of the temperature of the generating coil increasing and deteriorating the insulation can be eliminated. In addition, in the present invention, since there are no protruding parts such as fan blades on the flywheel or boss member, the coil can be cooled well without making the generator larger. Therefore, for the same generator rating, the generator can be made smaller than before. Moreover, since the grooves in the boss member can be easily formed when the boss member is manufactured by pressing or the like, a generator with good heat dissipation can be obtained without any manufacturing difficulties.

[Embodiments] Examples of the present invention will be described below with reference to the accompanying drawings.

1 to 6 show an embodiment of the present invention. In FIGS. 1 and 2, 1 is a flywheel magnet rotor, 2 is a stator, and these are used to form a flywheel for an internal combustion engine. A magnet generator is configured.

As shown in FIGS. 3 and 4, the flywheel magnet rotor 1 includes a flywheel 3 formed of a magnetic material such as iron into a substantially cup shape, and a flywheel magnet rotor 1 attached to a bottom wall 301 of the flywheel 3. It consists of a boss member 4, which is attached to the inner periphery of the peripheral wall 302 of the flywheel 3, and permanent magnets 5a to 5f installed at equal angular intervals on the inner periphery of the peripheral wall 302 of the flywheel 3, and the permanent magnets 5a, 5b, . . . The flywheel is magnetized in the radial direction so that different magnetic poles are aligned.
The boss member 4 has a structure in which a flange portion 402 is integrally provided at one end of a rotary shaft mounting boss portion 401,
The boss portion 401 has a tapered hole 403 for fitting a rotating shaft. A boss attachment hole 303 is provided in the center of the bottom wall portion 301 of the flywheel 3, and the boss portion 401 of the boss member 4 is inserted into the flywheel 3 through this attachment hole 303, and the flange portion of the boss member is inserted into the flywheel 3. 402 is in contact with the outer surface of the bottom wall 301 of the flywheel 3 and is fixed to the bottom wall 301 with rivets 6. Figure 5 shows the boss member 4
This figure shows the surface of the flange portion 402 that contacts the bottom wall portion 301 of the flywheel 3. As is clear from the figure, the surface of the flange portion 402 that contacts the bottom wall portion 301 of the flywheel 3 has a plurality of Grooves 404, 404, . . . extending in the radial direction are provided, and these grooves are provided so as to open at the outer peripheral portion of the flange portion 402 (the outer peripheral side of the flywheel). In addition, in FIG. 5, the small hole 405 is the rivet 6.
This is a hole for inserting.

On the other hand, each groove 4 of the flange portion 402 of the boss member is inserted through the bottom wall portion 301 of the flywheel 3.
A hole 304 communicating with 04 is provided. Each hole 304 and groove 404 form a fluid passage 7 that communicates between the inside and outside of the flywheel 3, and as shown in FIG. (on the outer circumferential side of the flywheel 3). Therefore, when the flywheel 3 rotates, the cooling medium (air or oil) in the grooves 404 is blown outward in the radial direction by centrifugal force, causing a flow of cooling medium toward the outside in the radial direction within each groove 404. This causes the hole 304
A suction force is generated through which the cooling medium inside the flywheel 3 is sucked out.

The stator 2 combined with the flywheel magnet rotor generates electricity in each salient pole portion of the annular star-shaped iron core 8, which has a large number of salient pole portions 802, 802, . . . radially protruding from an annular yoke portion 801. This stator consists of a coil 9 wound around the yoke part 80 of the iron core 8.
The spigot part 801a is positioned on the rotor by fitting the spigot part 801a into the spigot part 10a of the stator mounting part 10 provided in the case of the engine, etc., and the yoke part 80
The bolt 11 inserted into the bolt insertion hole 803 provided in 1 is screwed into the mounting portion 10 to be attached to the engine. Then, with the stator 2 positioned and fixed in this manner, each salient pole portion 80 of the stator
The tip portion (magnetic pole portion) of the flywheel magnet rotor 1 faces the magnetic pole portion of the flywheel magnet rotor 1 through a predetermined gap,
As the flywheel magnet rotor 1 rotates, a voltage is induced in the generator coil 9.

The power generation coil 9 of the stator 2 is connected to a predetermined number of phases, and the lead wires 9a to 9 drawn out from the power generation coil
9c and the like are covered with an insulating tube 12 and led out all at once. The lead wires gathered together by the insulating tube 12 are clamped by a clamp fitting 13 and fixed to the iron core 8.

In the above embodiment, when the flywheel magnet rotor 1 rotates, a flow of cooling medium (air or oil) radially outward occurs in each groove 401 of the flange portion 402 of the boss member 4 as described above.
This generates a suction force that sucks out the cooling medium inside the flywheel to the outside of the flywheel through the groove 404 and the hole 304 provided in the bottom wall of the flywheel. Therefore, the cooling medium located deep inside the flywheel 3 flows through the holes in the bottom wall of the flywheel and the grooves in the flange of the boss member, as shown by arrow A in FIGS. 2 and 4. The heat is continuously discharged to the outside of the flywheel through the heat exchanger, which improves the flow (circulation) of the cooling medium inside and outside the flywheel and prevents heat from accumulating inside the flywheel. Therefore, heat dissipation from the power generation coil 9 can be improved, and the risk of the temperature of the power generation coil 9 becoming high and deteriorating the insulator can be eliminated. In this case, the flywheel 3 and the boss member 4 are not provided with protruding parts such as blower blades, so the coil 9 can be cooled well without increasing the size of the generator. Therefore, if the ratings of the generators are the same, the generators can be made smaller than before. Moreover, each groove 404 of the boss member 4 is
Since the boss member 4 can be easily formed when manufactured by press working or the like, a generator with good heat dissipation can be obtained without any difficulty in manufacturing.

Groove 40 provided in flange portion 402 of boss member 4
4 is not limited to the shape shown in FIG. 5; for example, as shown in FIGS. 7 and 8, the groove 404 has a shape wider than the rib 406 between the grooves.
It is also possible to provide

In each of the above embodiments, the groove 404 provided in the flange portion 402 of the boss member 4 is formed so as not to penetrate the flange portion in the axial direction.
As shown in FIGS. 9 and 10, the groove 404 provided in the flange portion 402 may be formed to penetrate in the axial direction. In this case as well, since the fluid inside the groove 404 is blown outward in the radial direction by centrifugal force, the same effect as described above can be obtained.

As shown in FIG. 10, in a flywheel magnet generator for an internal combustion engine, a pulley 15 around which a rope or the like for starting the engine is wound may be attached to the flange portion 402 of the boss member 4. In this case, the flange Even if a groove 404 is provided through the portion 402, the groove 404 is closed by the pulley 15 and opens only on the outer circumferential side of the flywheel. You can get the same effect as .

In the above embodiment, the flywheel magnet rotor is equipped with six permanent magnets, but the number of permanent magnets is arbitrary, and one ring-shaped magnet is attached to the inner circumference of the flywheel. A flywheel magnet rotor can also be constructed by magnetizing the magnets to form a predetermined number of magnetic poles.
Further, in each of the above-mentioned magnetic poles, the magnetic pole of the permanent magnet constitutes a magnetic pole directly facing the stator, but it is of course possible to attach a magnetic pole piece to each magnetic pole of the permanent magnet.

[Effects of the invention] As described above, according to the invention, a groove extending in the radial direction and opening toward the outer circumferential side of the flywheel is provided in the flange portion of the boss member attached to the flywheel, and Since a hole is provided that penetrates the bottom wall and communicates with the groove, the temperature of the generating coil can be adjusted by improving the circulation of the cooling medium inside and outside the flywheel without increasing the size of the generator or complicating its structure. It has the effect of suppressing the increase.

[Brief explanation of drawings]

Figure 1 is a front view showing an embodiment of the present invention, Figure 2 is a front view showing an embodiment of the present invention.
The figure is a sectional view taken along the - line in Fig. 1, Fig. 3 is a front view of the flywheel magnet rotor used in the same embodiment, Fig. 4 is a sectional view taken along the - line in Fig. 3, and Fig. 5 is a sectional view taken in the same embodiment. 6 is a front view of the boss member used, FIG. 6 is a side view of the main part showing the opening of the groove of the boss member in the same embodiment, FIG. 7 is a front view of a half part showing a modified example of the groove of the boss member, and FIG. 8 is a side view of the main part showing the opening of the groove when the boss member of FIG. 7 is used, FIG. 9 is a rear view of a flywheel magnet rotor used in another embodiment of the present invention, and FIG. The figure is a sectional view taken along the line -- in FIG. 1...Flywheel magnet rotor, 2...Stator, 3...Flywheel, 301...Bottom wall part,
302... Peripheral wall part, 304... Hole, 4... Boss member, 401... Boss part, 402... Flange part,
404...Groove, 5a to 5f...Permanent magnet, 7...
...Flow hole.

Claims (1)

[Scope of utility model registration request] A flywheel formed in a substantially cup shape and a flange part are integrally formed at one end of a boss part for attaching a rotating shaft, and the flywheel is attached with the flange part being in contact with the outer surface of the bottom wall part of the flywheel. A flywheel magnet rotor including a boss member attached thereto and a permanent magnet attached to an inner surface of a peripheral wall portion of the flywheel, an iron core having a magnetic pole portion facing a magnetic pole of the flywheel magnet rotor, and the iron core. A flywheel magnet generator for an internal combustion engine comprising a stator arranged inside the flywheel and a winding generating coil, and a stator arranged inside the flywheel. A flywheel magnet for an internal combustion engine, characterized in that a plurality of grooves are provided that open on the outer peripheral side of the flywheel, and a hole that penetrates a bottom wall of the flywheel and communicates with the grooves is provided. Generator.