JPS61124246A - Magnet generator - Google Patents

Abstract

PURPOSE:To efficiently cool the generating coil of a stator by arranging a plurality of vent holes on the bottom of a cup-shaped flywheel, and providing a plurality of cooling fans oppositely to the window. CONSTITUTION:In a magnet motor in which a magnet 6 is mounted inside a cup-shaped flywheel 5 mounted on a drive shaft 4 to form a rotor 1 and a stator 2 is opposed, a plurality of vent windows 17 are arranged circumferentially on the bottom of the flywheel 5. A nonmagnetic plate 7 is inserted to between a seat 51 for mounting the flywheel 5 on the magnet 6 and the magnet 6. A plurality of cooling fans 18 are connected to the position corresponding to the window 17 of the flywheel 5 from the plate 7. Thus, the parts in the case are efficiently cooled to enhance the durability and the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnet generator installed in an internal combustion engine mounted on a vehicle.

[Background of the invention]

As a magnet generator mounted on an internal combustion engine, a magnet is provided on the inner circumferential surface of a bowl-shaped 72-wheel, and the magnet is fixed to the bowl-shaped flywheel by a member that clamps both end surfaces of the magnet in the axial direction. The rotor is fixed to a generator drive shaft of an internal combustion engine, a stator fixedly attached to the internal combustion engine is opposed to the rotor, and a cover covering the above components is attached to the internal combustion engine. A structure fixed to the engine is used.

The magnet generator in this paper is sealed with a cover, so cooling it efficiently is an important issue.

The cooling structure of the conventional magnet generator is based on Utility Model Publication No. 59-1092.
As described in No. 9, it is possible to install multiple blade-like protrusions toward the center on the inner periphery of an annular spacer made of non-magnetic material, but if the spacer is made of synthetic resin, As the temperature increases, thermal deformation of the synthetic resin occurs, and the retention of the magnet becomes unstable, leaving concerns about mechanical reliability.

In addition, when non-magnetic metal is used, manufacturing costs increase,
Therefore, it is necessary to take this into consideration.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and includes a magnet provided on the inner peripheral surface of a bowl-shaped flywheel, and a member that clamps both end surfaces of the magnet in the axial direction to attach the magnet to the bowl-shaped flywheel. The J4. Provided is a magnet generator in which a stator attached with screws is opposed to the rotor, and a cover covering the above-mentioned components is fixed to an internal combustion engine, in which a generating coil of the stator can be efficiently cooled. This is what I am trying to do.

If efficient cooling is performed, it is safe to construct cooling fans and other parts using synthetic resin, and the life of the insulator can be extended, and burnout accidents caused by poor insulation can be prevented.

In addition, if efficient cooling can be achieved, overheating can be prevented even if the amount of heat generated by the generator is large, eliminating the need for thicker conductors or the use of high-grade insulating materials.
Naturally, it can be expected that the generator will be made smaller, lighter, and lower in cost.

[Summary of the invention]

In order to achieve the above object (improvement of cooling efficiency), the magnet generator of the present invention has a plurality of ventilation windows arranged in a row in the circumferential direction on the bottom surface of the bowl-shaped flywheel of the magnet generator of the above type. ,
A plurality of cooling holes are provided facing the plurality of ventilation windows, and a non-magnetic ring-shaped plate member is interposed and fixed between the magnet holding member and the magnet, and the plurality of cooling holes are provided. The cooling fan is characterized in that it is integrally connected to one side of the ring-shaped plate member.

[Embodiments of the invention]

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

FIG. 1 is a longitudinal sectional view showing the structure of the magnet generator of the present invention, in which 1 is a rotor, 2 is a stator, and 3 is a cover that seals the rotor 1 and stator 2.

The rotor 1 includes a bowl-shaped flywheel 5 fixed to a generator drive shaft 4 of an internal combustion engine, and a plurality of magnets 6 attached to the inner peripheral surface of a cylindrical portion 5a of the flywheel 5.
It consists of a non-magnetic plate 7.8 which clamps and fixes both end surfaces of the magnet 6 in the axial direction on the inner peripheral surface of the flywheel 5. The stator 2 has the magnet 6 provided on the rotor l.
A power generation core 10 fixed to the engine case 9 inside the
and a power generating coil 11 in which a conducting wire is wound around the power generating core 10.
It consists of. The cover 3 is attached to the engine case 9.

A tapered portion 4a is formed at one end of the generator drive shaft 4, and a cylindrical boss 12 is fitted into the tapered portion 4a. Further, on the end face of the generator drive shaft 4, there is a nut 1 which is crimped onto the boss 121r: the tapered portion 4a via the washer 13.
Screw 4 together and tighten.

The flywheel 5 is integrally connected to the boss 12.

On the inner periphery of the cylindrical portion 5a of the flywheel 5, an inner flange-shaped seat 51 is formed near the bottom thereof. An enlarged cross section of the catch seat 51 is shown in FIG.

The magnet 6 and the non-magnetic plates 7 and 8 are attached to the flywheel 5 by arranging the non-magnetic plates 788 on both sides of the magnet 6, applying pressure to the open end A of the flywheel 5, bending it into an L-shape, and tightening it. It is being

On the bottom surface of the flywheel 5, as shown in FIG. 3, a plurality of ventilation windows 17 are opened at appropriate intervals in the circumferential direction, and the ventilation windows 17 are located at positions approximately corresponding to the generating coils 11 of the stator 2. It is set in. Further, cooling fins 18 are arranged radially between a portion of the non-magnetic plate 7 located on the bottom side of the flywheel 5 facing the ventilation window 17 and between the ventilation windows 17.

4 is a front view of the radial cooling fins 18, FIG. 5 is a side view of the same, and FIG. 6 is an enlarged view of section B in FIG.

The height of the catch seat 51 is set to be greater than the height of the fin 18 so that a gap is created between the fin 18 and the bottom surface of the flywheel 5.

The non-magnetic plate 7 is constructed as shown in FIGS. 4 to 6. The outer periphery held between the flywheel 5, the catch 51, and the magnet 6 is made thinner than the inner periphery. 52, a companion convex portion 71 for locking its rotation, and a convex portion 72 for locking the magnet 6 on the opposite side are integrally molded of synthetic resin.

As shown in FIGS. 2 and 7, the seat 51 of the flywheel 5 is formed so that the surface that receives the magnet 6 and the surface that receives the non-magnetic plate 7 have a step, so that the flywheel Exemption from bending into an L shape by applying pressure to the opening side end of 5.
The magnet 6 is pressed against the seat 51 and, at the same time, also clamps the non-magnetic plate 7 to fix the non-magnetic plate 7.

When the fins 18 rotate together with the rotor l, they circulate the cooling air in the direction of the arrow in FIG.
Cooling air can be circulated between the voids of the 200 stator coils 1. At this time, the cooling air pushed out by the fins 18 that do not face the ventilation window 17 passes through the gap between the fins 18 and the bottom surface of the flywheel 5, and passes through the ventilation window 17.
flows out and circulates.

In the magnet generator of this embodiment configured as described above, cooling air is generated by the rotation of the fins 18 that bleed through the rotation of the rotor 1. As such, the heat passes through the gap between the generating coils 11 of each magnetic pole while taking away the heat generated by the generating coils 11, and flows out into the cover 3 through the ventilation window 17 of the two-wheel 5. After the cooling air that flows out hits the end surface 3a of the cover 3, it passes through the gap between the cylindrical part 5a of the flywheel 5 and the cover 3,
Here, it is dissipated to the outside via the Me cover 3. The cooled cooling air then circulates again from the open side of the flywheel 5 to the gap of the power generation coil 11. Due to this circulation of cooling air, the power generation coil 1
1 is efficiently cooled, and the life of the insulator of the generating coil 11 is not shortened or burnout occurs. In addition, it is possible to maintain a safe heat balance during operation without increasing the thickness of the conductor wire of the generating coil 11 or using high-grade insulating materials, making it possible to reduce manufacturing costs. The fin is held between the seat 51 of the flywheel 5 and the magnet 6, and rotation (relative displacement with respect to the flywheel) is stopped by the retaining portion 71, so there is no need to provide a special fin fixing means. , it is possible to easily and firmly fix it, and the processing and assembly are extremely simple. In addition, since there is a gap between the fins and the bottom of the flywheel, the shape of the fins is not affected by the shape of the bottom of the flywheel, and since the fins are arranged in the radial direction, rotation in either the left or right direction This eliminates the hassle of setting the fin shape for each model.

Furthermore, the fins are integrally molded as non-extrusive plates made of synthetic resin, which improves productivity, and because almost the entire circumference is fixed by the catch and magnets, there is no reduction in holding force due to thermal deformation. It has excellent mechanical reliability.

〔Effect of the invention〕

As described in detail above, the magnet generator of the present invention has a simple configuration and has an excellent practical effect of being able to efficiently cool the components inside the sealed case. This greatly contributes to improving the reliability, durability, and performance of generators, as well as reducing costs.

[Brief explanation of the drawing]

Figure 1 is a sectional view of one embodiment of the magnet generator of the present invention, Figure 2 is a cross-sectional view of an embodiment of the magnet generator of the present invention;
The figure is an enlarged sectional view of a part of the flywheel in the above embodiment, and FIG. 3 is a front view of the flywheel shown for explaining the arrangement of the fins in the above embodiment. 4 to 6 show the cooling fan of the above embodiment, FIG. 4 is a front view, FIG. 5 is a side view, and FIG. 6 is an enlarged view of section B in FIG. 5. FIG. 7 is an external view of the component shown in FIG. 2, viewed in the direction of the arrow ■. l...Rotor, 2...Stator, 3...Cover, 4
... Generator drive shaft, 5...-bowl-shaped flywheel,
6... Magnet, 7.8... Non-magnetic plate, 9... Engine case, 10... Power generation core, 11... Power generation coil,
17... Ventilation window, 18... Cooling fan fin.

Claims (1)

[Claims] 1. A rotor is constructed by providing a magnet on the inner circumferential surface of a bowl-shaped flywheel, and fixing the magnet to the bowl-shaped flywheel using members that clamp both end surfaces of the magnet in the axial direction. This rotor is fixed to the generator drive shaft of the internal combustion engine, a stator fixedly attached to the internal combustion engine is opposed to the rotor, and a cover covering the above components is attached to the internal combustion engine. In the magnet generator fixed to the base of the bowl-shaped flywheel, a plurality of ventilation windows are arranged in a row in the circumferential direction on the bottom surface of the bowl-shaped flywheel, and a plurality of cooling fans are provided opposite to the plurality of ventilation windows, and, A non-magnetic ring-shaped plate member is interposed and fixed between the magnet holding member and the magnet, and the plurality of cooling fans are integrally connected to one side of the ring-shaped plate member. A magnet generator characterized by: 2. The magnet generator according to claim 1, wherein the plurality of cooling fans are supported through a gap between them and the bottom surface of a bowl-shaped flywheel. 3. The magnet power generator according to claim 1, wherein the ring-shaped plate member integrally connected with the cooling fan has a convex portion that engages with a flywheel. Machine.