JPS61236350A - Magnet generator - Google Patents

Abstract

PURPOSE:To enhance the cooling efficiency of a stator by forcibly cooling and to increase the productivity and the mechanical reliability by forming a plurality of ribs extending in a radial direction on the inside of the bottom of a cup-shaped flywheel which forms a rotor. CONSTITUTION:In a magnet generator in which a cup-shaped flywheel 5 is supported to enclose a stator 2 mounted with a generating coil 11 and a magnet 6 is mounted on the inner surface of the flywheel 5 to form a rotor 1, ribs 5b extending in radial direction or in the direction at an arbitrary angle to the radial direction are formed inside the bottom of the flywheel 5. A vent window 5c may be formed at the intermediate of the ribs 5b. The entire flywheel 5 may be integrally formed by drawing a thin plate. Thus, as compared with the case that the flywheel is formed by cast iron, the productivity and the mechanical strength can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnet generator for use in vehicles and the like, and more particularly to a magnet generator having a cooling structure for a generator coil of a stator.

[Background of the invention]

The cooling structure of the conventional magnet generator is based on Utility Model Application No. 56-2037.
As described in Publication No. 6, the flywheel is made of cast iron and blade-like protrusions are formed on the inside of the bottom surface, but manufacturing with cast iron results in thick walls and increased weight;
There were many problems that needed to be resolved in practical use, such as poor productivity and concerns about mechanical reliability.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to provide a magnet generator having a forced cooling structure that is small and lightweight and has excellent productivity and mechanical reliability.

[Summary of the invention]

In the present invention, as blades for forced cooling, ribs are formed on the inside of the bottom surface of a flywheel made by drawing a thin plate so as to extend to the outer periphery in a plurality of radial directions or in a direction having an arbitrary angle thereto. It is a magnetic generator with multiple ventilation windows in the middle of the book's ribs.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a longitudinal sectional view and a front view of an embodiment of the magnet generator of the present invention, in which 1 is a rotor, 2 is a stator, and 3 is a state in which the rotor 1 and stator 2 are in a sealed state. It is a cover that covers it with. The rotor 1 includes a bowl-shaped flywheel 5 fixed to a drive shaft 4 of an internal combustion engine, and a cylindrical portion 5a of the flywheel 5.
It consists of a plurality of magnets 6 attached to the inner circumferential surface of the magnet 6, and a retaining ring 7 that holds the magnets 6.

The stator 2 includes a power generation core 10 fixed to the engine case 8 inside the magnets 6 of the rotor 1, and a power generation coil 11 around which a conductive wire of the power generation core 10 is wound. The cover 3 is.

It is attached to the engine case 8.

A tapered portion 4a is formed at one end of the drive shaft 4, and a cylindrical boss 9 is fitted into the tapered portion 4a. Further, a nut 13 is screwed onto the end surface of the drive shaft 4 through a washer 12 to press the boss 9 onto the tapered portion 4a.

The flywheel 5 of the rotor 1 is formed on the outer periphery of the boss 9 by drawing a material made of, for example, an iron plate with a thickness of 3.2 mm or less into a bowl shape,
A three-step portion for holding the magnet 6 is formed near the bottom surface. Furthermore, on the bottom surface, a plurality of ribs 5b are provided inwardly in a shape shown in detail in FIGS. It is formed in a stretched state.

In addition, a plurality of ventilation windows 5 are provided in the middle of the plurality of ribs 5b.
C are provided at appropriate intervals in the circumferential direction. The ribs 5b not only improve the rigidity and mechanical strength of the bottom surface of the flywheel 5, but also function as cooling blades, so they have the following effect.

When the ribs 5b rotate together with the rotor 1, cooling air is circulated in the direction of the solid arrow in FIG. In other words, after the cooling air can be circulated between the ventilation window 5c of the flywheel 5, the gap between the rotor 1 and the cover 3, and the gap of the generator coil 11 of the stator 2, the rotor 1 starts to rotate. By 5b
The cooling air generated by the cooling air passes through the gaps of the various power generation coils 11 as shown by the arrows in FIG.
c flows into the cover 3. The outflowing cooling air hits the end surface 3a of the cover 3, passes through the gap between the cylindrical portion 5a of the flywheel 5 and the cover 3, and radiates the heat taken there to the outside via the cover 3. Then, the cooled cooling air is again supplied to the generating coil 11 from the opening side of the flywheel 5.
circulates to the voids of the By circulating the cooling air in this manner, the power generation coil 11 is efficiently cooled, so that the life of the insulator of each power generation coil 11 is not shortened and burnout does not occur.

Further, since there is no need to thicken the conductor of the generating coil 11 or use high-grade insulating material, it is possible to reduce the size, weight, and cost. In particular, the cooling blades are flywheel 5
As explained above, according to the present invention, the power generation coil of the stator can be efficiently cooled, thereby extending the life of the insulator and preventing burnout.

In addition, there is no need to thicken the conductor wire of the generating coil or use high-grade insulating materials, resulting in excellent productivity and mechanical reliability.
It is possible to create a magnet generator that is small, lightweight, and low cost.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the magnet generator of the present invention, FIG. 2 is a front view of FIG. 1, and FIGS. 3, 4, and 5 are ribs shown in FIGS. 1 and 2. They are an enlarged front view, a longitudinal cross-sectional view, and a rib cross-sectional view showing important parts, respectively. 1... Rotor, 2... Stator, 3... Cover, 4
... Drive shaft, 5... Bowl-shaped flywheel, 6...
・Magnet, 7... Retaining ring, 8... Engine case, 9.
...Boss, 10...Generating core, 11...Generating coil, 12...Washer, 13...Semi-1 diagram

Claims (1)

[Claims] 1. A rotor attached to a drive shaft of an internal combustion engine, a stator attached to an engine case or a cover, and a cover attached to the engine case to seal the rotor and stator. The rotor comprises a bowl-shaped flywheel fixed to the drive shaft, a magnet attached to the inner peripheral surface of the flywheel, and a member holding the magnet, and the stator is attached to the inner side of the rotor and the magnet. In a magnet generator consisting of a power generation core fixed to an engine case and a power generation coil in which a conductive wire is wound around the power generation core, a plurality of wires are arranged in the radial direction or in a predetermined direction on the inside of the bottom surface of the flywheel of the rotor. A magnet generator characterized in that a rib is formed extending toward the outer circumference in an angular direction. 2. The magnet generator according to claim 1, wherein a plurality of ventilation windows are provided between the plurality of ribs. 3. The magnet generator according to claim 1, wherein the bowl-shaped flywheel and the ribs are integrally formed by drawing a thin plate.