JP3030375U - Flywheel flywheel for magnet generator - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To obtain a flywheel capable of preventing thermal deterioration of a magneto coil. SOLUTION: A plurality of projecting pieces 7 are provided on an outer surface of a bottom portion 3b of a flywheel main body 3 at intervals in the circumferential direction. Each protrusion 7 is provided so as to be inclined with respect to the circumferential direction. The bottom portion 3b of the flywheel body 3 has a surface 7 of a projecting piece 7 that receives wind pressure when the flywheel body 3 rotates.
A hole 11 penetrating the bottom portion 3b of the flywheel body 3 is provided adjacent to the surface 7b on the opposite side of a. [Effect] When the flywheel body 3 rotates, one surface 7a of each projecting piece 7 receives wind pressure, and the opposite surface 7b side becomes negative pressure. Due to this negative pressure, the hot air in the flywheel body 3 is sucked out from the hole 11 adjacent to the surface 7b on the opposite side of the surface 7a of the projecting piece 7 that receives the wind pressure.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a flywheel for a flywheel magnet generator mounted on an engine shaft.

[0002]

[Prior art]

 Generally, a flywheel magnet generator is composed of a flywheel 1 attached to an engine shaft of an engine and a stator 2 attached to an engine case in the flywheel 1, as shown in FIGS. 4 and 5. . The flywheel 1 has a structure in which a magnet 4 is attached to the inner surface of the tubular portion 3a of the flywheel body 3. The stator 2 has a structure in which a generator coil 6 is wound around a stator iron core 5. Examples of the power generation coil 6 include a lamp lighting power generation coil, a battery charging power generation coil, and an ignition coil.

On the outer surface of the bottom portion 3b of the flywheel body 3, a plurality of projecting pieces 7 are provided so as to be circumferentially spaced apart. These protrusions 7 are provided with their surfaces oriented in a direction orthogonal to the radial direction. These projecting pieces 7 are used as recoil starter claws or as a winding cylinder around which an engine starting rope is wound. When used as a winding body for winding a rope for starting an engine, a plurality of projecting pieces 7 are provided with rope hooks 8 formed of concave portions.

A boss portion 3c is provided at the center of the bottom portion 3b of the flywheel body 3, and an engine shaft fitting hole 9 is provided in the boss portion 3c.

Further, the bottom portion 3b of the flywheel main body 3 is provided with a plurality of removal jig holes 10 for removing the flywheel 1.

[0006] Recently, with the progress of miniaturization and higher output of engines, there has been a demand for higher output of flywheel magnet generators.

[0007]

[Problems to be solved by the device]

 However, when the output of the flywheel magnet generator is increased, the temperature rise of the magneto coils 6 becomes large, and there is a concern that the thermo coils of the magneto coils 6 are deteriorated by heat.

An object of the present invention is to provide a flywheel capable of preventing heat deterioration of a magneto coil.

[0009]

[Means for Solving the Problems]

 The present invention has a structure in which an engine shaft fitting hole is provided in a boss portion at the center of the bottom of a flywheel body, and a plurality of protrusions are provided on the outer surface of the bottom of the flywheel body at circumferential intervals. Flywheel An improved flywheel for a magnet generator.

In the flywheel for a flywheel magnet generator according to claim 1, each protrusion is provided so as to be inclined with respect to the circumferential direction, and at the bottom of the flywheel main body when the flywheel main body rotates. A hole penetrating the bottom of the flywheel body is provided adjacent to the surface opposite to the surface of the projecting piece that receives wind pressure.

In this way, when each protrusion on the outer surface of the bottom of the flywheel body is inclined with respect to the circumferential direction, one surface of each protrusion receives the wind pressure when the flywheel body rotates, and the other side of the opposite side receives the wind pressure. The surface side becomes negative pressure. Due to this negative pressure, the hot air in the flywheel body is sucked out from the hole provided through the bottom of the flywheel main body adjacent to the surface of the protrusion opposite to the surface receiving the wind pressure. Will be done. As a result, the generator coil in the flywheel body is cooled by air, and thermal deterioration can be prevented.

The flywheel for a flywheel magnet generator according to a second aspect is characterized in that a hole penetrating the bottom of the flywheel body is provided for each of the projecting pieces.

When the holes are provided in each of the projecting pieces in this manner, the power generating coil can be more efficiently air-cooled.

[0014]

[Embodiment of device]

 1 and 2 show a first example of an embodiment of a flywheel for a flywheel magnet generator according to the present invention.

In the flywheel 1 for the flywheel magnet generator of this example, the protrusions 7 that are provided at the outer surface of the bottom portion 3b of the flywheel main body 3 at intervals in the circumferential direction are provided in the circumferential direction. On the other hand, they are provided so as to be inclined as illustrated.

Further, the bottom portion 3b of the flywheel body 3 is adjacent to the surface 7b opposite to the surface 7a of the projecting piece 7 that receives wind pressure when the flywheel body 3 rotates. A hole 11 that penetrates the bottom portion 3b is provided. These holes 11 can also be used as holes for a removal jig when the flywheel 1 is removed. Other configurations are similar to those in FIGS. 4 and 5 described above.

When the projections 7 on the outer surface of the bottom portion 3b of the flywheel main body 3 are inclined in this manner with respect to the circumferential direction, the one surface 7a of each projection 7 when the flywheel main body 3 rotates does not generate wind pressure. The negative pressure is received on the surface 7b side opposite to the receiving side. Due to this negative pressure, the hot air in the flywheel body 3 is provided so as to be adjacent to the surface 7b of the projection 7 that is opposite to the surface 7a that receives the wind pressure, and penetrate the bottom 3b of the flywheel body 3. It will be sucked out from each hole 11 as shown in FIG. As a result, the magneto coils 2 in the flywheel main body 3 are air-cooled, and thermal deterioration can be prevented.

FIG. 3 shows a second example of the embodiment of the flywheel for a flywheel magnet generator according to the present invention.

In the flywheel for the flywheel magnet generator of this example, the holes 11 are provided in each of the protrusions 7. Other configurations are the same as those in FIGS. 1 and 2 described above.

When the holes 11 are provided for each of the projecting pieces 7 in this manner, the power generating coil 2 can be more efficiently cooled by air.

[0021]

[Effect of device]

 In the flywheel for a flywheel magnet generator according to claim 1, since each projecting piece on the outer surface of the bottom of the flywheel body is inclined with respect to the circumferential direction, each projecting piece is rotated when the flywheel body rotates. One side receives wind pressure, and the other side receives negative pressure. Due to this negative pressure, the hot air inside the flywheel body is sucked out from the hole provided through the bottom of the flywheel body, adjacent to the surface of the projecting piece on the side opposite to the surface receiving the wind pressure. As a result, the generator coil in the flywheel body is cooled by air, and thermal deterioration can be prevented.

In particular, in the present invention, the flywheel main body can be implemented by only changing a part of the shape, which is advantageous in terms of cost.

In the flywheel for a flywheel magnet generator according to the second aspect, since the hole penetrating the bottom of the flywheel body is provided for each of the projecting pieces, the generator coil is more efficiently cooled by the air. can do.

[Brief description of drawings]

FIG. 1 is a bottom view showing a first example of an embodiment of a flywheel for a flywheel magnet generator according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a bottom view showing a second example of an embodiment of a flywheel for a flywheel magnet generator according to the present invention.

FIG. 4 is a bottom view of a conventional flywheel for a flywheel magnet generator.

5 is a vertical cross-sectional view of FIG.

[Explanation of symbols]

 1 Flywheel 2 Stator 3 Flywheel body 3a Cylinder part 3b Bottom part 3c Boss part 4 Magnet 5 Stator iron core 6 Generator coil 7 Projection piece 7a Face receiving wind pressure 7b Opposite face 8 Rope hook 9 Engine shaft fitting hole 10 Removal cure Tool hole 11 hole

Claims (2)

[Scope of utility model registration request] 1. A fly in which an engine shaft fitting hole is provided in a boss portion at the center of the bottom of a flywheel body, and a plurality of projecting pieces are projected on the outer surface of the bottom of the flywheel body at circumferential intervals. In a flywheel for a wheel magnet generator, each of the projecting pieces is provided so as to be inclined with respect to a circumferential direction, and a bottom surface of the flywheel body is provided with a surface of the projecting piece that receives wind pressure when the flywheel body rotates. A flywheel for a flywheel magnet generator, characterized in that a hole penetrating the bottom of the flywheel body is provided adjacent to the opposite surface. 2. The flywheel for a flywheel magnet generator according to claim 1, wherein a hole penetrating the bottom of the flywheel body is provided for each of the projecting pieces.