JPS5953782B2 - Magnetic fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnet fixing structure, and in particular, a plurality of magnets are fixed to the inner peripheral surface of a case to function as a flywheel, and is used in an epidermal magnet generator. This invention relates to a suitable magnet fixing structure.

Conventionally, a magnet is placed on the inner circumferential surface of a bowl-shaped case, the end surface of the magnet is held by a ring-shaped thin plate, and a cylindrical elastic member is arranged on the inner circumferential surface of the magnet to press the magnet against the inner circumferential surface of the case. At the same time, a structure has been considered in which an adhesive is allowed to flow into the gaps between the respective members, particularly the gap between the case and the magnet, to fix the components.

Such a conventional magnet fixing structure will be explained based on FIGS. 1 and 2.

1 and 2 show a flywheel portion used in an epidermal magnet generator.

The flywheel 1 has a bowl-shaped case 2 and a center piece 3 provided at the center thereof.

The center piece 3 is fixed to the bottom of the case 2 with rivets 4.

A plurality of magnets 5 are provided on the inner peripheral surface of the bowl-shaped case 2.
are arranged at equal intervals.

Ring-shaped thin plates 6 and 7 are provided on both end faces of these magnets 5 so that the magnets 5 can be held on the same plane.

The outer circumferential end surfaces of the annular thin plates 6 and 7 are in contact with the inner circumferential surface of the case 2, and the inner circumferential end surfaces are substantially on the same plane as the inner circumferential surface of the magnet 5.

Further, a cylindrical elastic member 8 is provided on the inner peripheral surface of the magnet 5 so as to press the magnet 5 against the inner peripheral surface of the case 2 .

Since the axial dimension of this cylindrical elastic member 8 is slightly shorter than the width of the magnet 5, a gap 9 is formed at the joint between the annular thin plate member 6.7 and the cylindrical elastic member 8.

In such a magnet fixing structure, when an adhesive is poured to fix the magnet 5 to the case 2, there is a drawback that the adhesive flows out through the gap 9 to the bottom of the case 2 before it hardens.

Adhesive leakage wastes the adhesive and is also very unfavorable in terms of appearance.

In order to prevent the adhesive from flowing out, it is conceivable to control the amount of adhesive to be injected or applied and inject or apply it little by little, but this is not preferable because it greatly impedes workability.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a magnet fixing structure that does not cause adhesive to leak out.

The present invention has a structure in which a ring-shaped thin plate provided at the end face of the magnet and a cylindrical elastic member are butted against each other to form a pocket portion, and a magnet and an adhesive for fixing the magnet are placed in the pocket portion. This is an attempt to prevent leaks.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 8.

Note that here, the same components as those in the conventional example described above are designated by the same reference numerals to simplify the explanation.

The flywheel 11 is a bowl-shaped case 2 made of magnetic material.
have.

A stepped portion 12 is formed near the bottom of the inner peripheral surface of the case 2, and a ring-shaped thin plate member 13 is disposed with the outer peripheral end surface of the stepped portion 12 in contact with the stepped portion 12.

A plurality of arc-shaped magnets 5 whose end faces are held by the flat surface of the ring-shaped thin plate material 13 are provided in contact with the inner circumferential surface of the case 2.

A cylindrical elastic member 14 is provided on the inner peripheral surface of these magnets 5.
is provided, and the magnet 5 is pressed against the inner peripheral surface of the case 2 by this cylindrical elastic member 14.

The inner circumferential surface of the annular thin plate material 13 protrudes slightly inward from the inner circumferential surface of the magnet 5 over the entire circumference, and the end surface of the cylindrical elastic member 14 abuts against this protrusion 15 to form an abutting portion 20. are doing.

That is, a pocket portion 16 is formed by the inner circumferential surface of the case 2, the magnet 5, the annular thin plate member 13, and the cylindrical elastic member 14.

After each part is assembled in this way, the joint surfaces of the outer circumferential surface of the magnet 5 and the inner circumferential surface of the case 2, the inner circumferential surface of the magnet 5 and the cylindrical elastic member 14, and the end surface of the magnet 5 and the annular thin plate material 13, respectively. Adhesive is injected into.

Usually, each part, especially the case 2, is preheated to a temperature determined by the characteristics of the adhesive used, and then the adhesive is injected.

When the adhesive is injected into the upper surface 18 of the magnet 5, the adhesive accumulated on the upper surface 18 of the magnet is transferred by capillary action to the outer peripheral surface of the magnet 5, the inner peripheral surface of the case 2, the inner peripheral surface of the magnet 5, and the cylindrical elastic member. It flows between 14 and 14.

Further, the excess adhesive 19 flows into the gap between the end face of the magnet 5 and the annular thin plate 13, accumulates in the pocket portion 16, and does not flow out to the outside.

Further, the accumulated adhesive 19 is further sucked up into each gap by capillary action and can greatly contribute to the adhesive effect.

According to this embodiment, the adhesive can be effectively supplied to the bonding surface, and the injection work can be performed without worrying about excess adhesive flowing out, and an improvement in workability can be expected.

Furthermore, the fact that there is no excess adhesive flowing out produces extremely good results in terms of appearance.

A related effect is that the reliability of adhesive strength can be improved.

The present invention provides a magnet fixing structure in which the annular thin plate material and the cylindrical elastic member are closely attached to each other over the entire circumference, so that the adhesive does not flow out to unnecessary locations within the case during magnet bonding. It has the effect of being able to.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the flywheel part of an outer rotor magnet generator with a conventional magnet fixing structure, and Figure 2 is a
3 is a plan view showing a flywheel having a magnetic fixing structure according to the present invention; FIG. 4 is a longitudinal sectional view taken along line IV-IV in FIG. 3; FIG. 5 is a perspective view showing the cylindrical elastic member of FIGS. 3 and 4, and FIGS. 6 to 8 are perspective views showing the magnet, ring-shaped thin plate material, and case, respectively. The figures up to Figure 8 are also component configuration diagrams arranged in the order of configuration. 2...Case, 5...Magnet, 1
DESCRIPTION OF SYMBOLS 1... Flywheel, 13... Annular thin plate material, 14... Cylindrical elastic member, 15...
...Protrusion part, 16...Pocket part, 19...
... Adhesive, 20 ... Butt part.

Claims (1)

[Claims] 1 A cylindrical case, a plurality of magnets arranged on the inner circumferential surface of the case, the end surfaces of the magnets are held in a flat part, the outer circumferential part is in contact with the inner circumferential surface of the case, and the inner circumferential part is held inside the magnet. a ring-shaped thin plate member that protrudes inward from the circumferential surface; a cylindrical elastic member that contacts the inner circumferential surface of the plurality of magnets and presses the magnets toward the inner circumferential surface of the case; A magnet fixing structure comprising an adhesive interposed between each member, wherein an end surface of the cylindrical elastic member is butt-jointed to a flat surface of the annular thin plate material.