JP2004194480A - Flywheel magnet rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flywheel magnet rotor wherein with the length of protrusion from the leading end face of the cylindrical portion of a flywheel reduced, a magnet case can be fixed on the flywheel at low cost with ease and the leakage of magnetic flux can be prevented. <P>SOLUTION: A flywheel magnet rotor comprises the flywheel 1 and permanent magnets 3 whose surfaces are covered with the magnet case 2 and which are fixed on the inner circumferential surface of the cylindrical portion 1a of the flywheel 1. The magnet case 2 covers the leading end of the cylindrical portion 1a of the flywheel 1 and is placed along the outer circumferential surface of the cylindrical portion 1a. The portion of the magnet case 2 positioned on the outer circumferential surface of the cylindrical portion 1a is fastened to the cylindrical portion 1a by fastening portions 5 constituted of welding portions 6. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flywheel magnet rotor used for a magnet generator.
[0002]
[Prior art]
As shown in FIGS. 6 and 7, a conventional flywheel magnet rotor has a cylindrical portion 1a, a bottom portion 1b closing one end of the cylindrical portion 1a, and a cylindrical portion 1a from the center of the bottom portion 1b. A flywheel 1 having a protruding boss 1c, a permanent magnet 3 whose surface is covered with a magnet case 2 and arranged on the inner periphery of a cylindrical portion 1a of the flywheel 1, and a cylinder of the flywheel 1. The structure has a gripping piece 4 that is provided by processing a part of the portion 1a and holds the magnet case 2 to fix the permanent magnet 3 to the cylindrical portion 1a. In this case, the gripping piece 4 is connected to the distal end surface of the cylindrical portion 1a so as to protrude toward the front end thereof, is bent so as to be bent inside the cylindrical portion 1a, and the distal end of the gripping piece 4 is interposed through the magnet case 2. The structure is such that the permanent magnet 3 is gripped (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-145995 (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in such a flywheel magnet rotor, the gripping piece 4 is connected to the distal end surface of the cylindrical portion 1a of the flywheel 1 so as to protrude forward, and is bent so as to be bent inside the cylindrical portion 1a. With such a structure, the axial size of the flywheel magnet rotor is increased, and the amount of material used to form the flywheel 1 is increased. Further, since the gripping piece 4 is protruded from the distal end surface of the cylindrical portion 1a of the flywheel 1, there is a problem that it takes a long time to process and the cost increases. Further, since the magnet case 2 on the permanent magnet 3 is directly pressed by the tip of the gripping piece 4, there is a problem that magnetic flux leaks due to the influence of the magnet case 2 and lowers the power generation output.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a flywheel magnet rotating device that can easily fix a magnet case to a flywheel at a low cost while preventing the leakage of magnetic flux in a state in which the protruding length of the flywheel from the tip end surface is shortened. Is to provide a child.
[0006]
[Means for Solving the Problems]
The present invention provides a flywheel including a tubular portion, a bottom portion closing one end of the tubular portion, and a boss projecting from the center of the bottom portion into the tubular portion, and a surface covered with a magnet case. The present invention is directed to a flywheel magnet rotor having a permanent magnet fixed to an inner periphery of a cylindrical portion of a flywheel.
[0007]
In the flywheel magnet rotor according to the present invention, the magnet case covers the tip of the cylindrical portion of the flywheel and is attached to the outer periphery of the cylindrical portion, and the magnet case on the outer periphery of the cylindrical portion is fixed to the cylindrical portion by the stopper. It is characterized by having.
[0008]
When the magnet case is attached to the outer periphery of the cylindrical portion of the flywheel so as to cover the distal end of the cylindrical portion, the length of the flywheel projecting from the distal end surface of the cylindrical portion can be reduced. Further, since the magnet case on the outer periphery of the cylindrical portion is fixed to the cylindrical portion by the stopper, the fixing of the magnet case to the flywheel can be easily performed at low cost, and the leakage of magnetic flux can be prevented.
[0009]
In this case, even if the stop portion is formed by a welded portion, it is formed by a concave portion provided on the outer periphery of the cylindrical portion and a convex portion provided on the magnet case and locked by the concave portion, Even if it is formed by a falling step portion provided on the outer periphery of the portion and a locking portion provided on the magnet case and bent and locked along the falling step portion, the cylindrical portion and the cylindrical portion May be formed by rivets that are stopped by penetrating through the magnet case on the outer periphery of the rivet. Regardless of the type of stop, the fixing of the magnet case to the flywheel can be performed easily and at low cost.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a first example of an embodiment of a flywheel magnet rotor according to the present invention, and is an enlarged view of a main part corresponding to a portion A in FIG.
[0011]
In the flywheel magnet rotor of this embodiment, the magnet case 2 covers the tip of the cylindrical portion 1a of the flywheel 1 and is attached to the outer periphery of the cylindrical portion 1a. The magnet case 2 on the outer periphery of the cylindrical portion 1a is fixed to the cylindrical portion 1a by a stopper 5. In this example, the stopper 5 is formed by a welded portion 6 obtained by welding the magnet case 2 to the cylindrical portion 1a. The welded portion 6 may be provided continuously or intermittently on the outer periphery of the cylindrical portion 1a, and may be provided either. Other configurations are the same as those in FIG.
[0012]
When the magnet case 2 is attached to the outer periphery of the cylindrical portion 1a while covering the distal end of the cylindrical portion 1a of the flywheel 1, it is possible to shorten the protruding length of the cylindrical portion 1a of the flywheel 1 from the distal end surface. it can. Further, since the magnet case 2 on the outer periphery of the cylindrical portion 1a is fixed to the cylindrical portion 1a by the stopper 5 formed of the welded portion 6, the fixing of the magnet case 2 to the flywheel 1 can be performed easily at low cost and the magnetic flux can be reduced. Leakage can be prevented.
[0013]
FIG. 2 is a second example of the embodiment of the flywheel magnet rotor according to the present invention, and is an enlarged view of a main part corresponding to a portion A in FIG.
[0014]
In the flywheel magnet rotor of this example, the magnet case 2 covers the tip of the cylindrical portion 1a of the flywheel 1 and is attached to the outer periphery of the cylindrical portion 1a. Is similar to the first example. In this example, the stopper 5 includes a V-shaped concave portion 7a provided on the outer periphery of the cylindrical portion 1a and a V-shaped convex portion 8a provided on the magnet case 2 and locked in the V-shaped concave portion 7a. Is formed. The V-shaped concave portion 7a and the V-shaped convex portion 8a may be provided continuously or intermittently on the outer periphery of the cylindrical portion 1a. Other configurations are the same as those in FIG.
[0015]
Even with such a structure, the same effect as in the first example can be obtained.
[0016]
FIG. 3 is a third example of the embodiment of the flywheel magnet rotor according to the present invention, and is an enlarged view of a main part corresponding to the portion A in FIG.
[0017]
In the flywheel magnet rotor of this example, the magnet case 2 covers the tip of the cylindrical portion 1a of the flywheel 1 and is attached to the outer periphery of the cylindrical portion 1a. Is similar to the first example. In the present embodiment, the stopper 5 has a rectangular cross section concave portion 7b provided on the outer periphery of the cylindrical portion 1a and a rectangular cross section convex portion provided on the magnet case 2 and fixed to the rectangular cross section concave portion 7b. 8b. The concave portion 7b having a rectangular cross section and the convex portion 8b having a rectangular cross section may be provided continuously or intermittently on the outer periphery of the cylindrical portion 1a. Other configurations are the same as those in FIG.
[0018]
Even with such a structure, the same effect as in the first example can be obtained.
[0019]
FIG. 4 is a fourth embodiment of the flywheel magnet rotor according to the present invention, and is an enlarged view of a main part corresponding to the portion A in FIG.
[0020]
In the flywheel magnet rotor of this example, the magnet case 2 covers the tip of the cylindrical portion 1a of the flywheel 1 and is attached to the outer periphery of the cylindrical portion 1a. Is similar to the first example. In this example, the stopper 5 is provided on the outer periphery of the cylindrical portion 1 a of the flywheel 1 and falls along the falling step 9 in the diameter reducing direction, and is provided on the magnet case 2 along the falling step 9. And a locking portion 10 bent and locked. The falling step portion 9 and the locking portion 10 may be provided continuously or intermittently on the outer periphery of the cylindrical portion 1a, and may be either. Other configurations are the same as those in FIG.
[0021]
Even with such a structure, the same effect as in the first example can be obtained.
[0022]
5 is a fifth example of the embodiment of the flywheel magnet rotor according to the present invention, and is an enlarged view of a main part corresponding to the portion A in FIG.
[0023]
In the flywheel magnet rotor of this example, the magnet case 2 covers the tip of the cylindrical portion 1a of the flywheel 1 and is attached to the outer periphery of the cylindrical portion 1a. Is similar to the first example. In the present embodiment, the stopper 5 is formed by a rivet 11 that is stopped by penetrating the cylindrical portion 1a of the flywheel 1 and the magnet case 2 on the outer periphery of the cylindrical portion 1a. The rivet 11 is provided intermittently on the outer periphery of the cylindrical portion 1a. Other configurations are the same as those in FIG.
[0024]
Even with such a structure, the same effect as in the first example can be obtained.
[0025]
【The invention's effect】
In the flywheel magnet rotor according to the present invention, since the magnet case is attached to the outer periphery of the cylindrical portion of the flywheel so as to cover the distal end of the cylindrical portion of the flywheel, the projecting length of the cylindrical portion of the flywheel from the distal end surface is reduced. Can be shorter. Further, since the magnet case on the outer periphery of the cylindrical portion is fixed to the cylindrical portion by the stopper, the fixing of the magnet case to the flywheel can be easily performed at low cost, and the leakage of magnetic flux can be prevented.
[0026]
In this case, even if the stop portion is formed by a welded portion, it is formed by a concave portion provided on the outer periphery of the cylindrical portion and a convex portion provided on the magnet case and locked by the concave portion, Even if it is formed by a falling step portion provided on the outer periphery of the portion and a locking portion provided on the magnet case and bent and locked along the falling step portion, the cylindrical portion and the cylindrical portion May be formed by rivets that are stopped by penetrating through the magnet case on the outer periphery of the rivet. Regardless of the type of stop, the fixing of the magnet case to the flywheel can be performed easily and at low cost.
[Brief description of the drawings]
FIG. 1 is an enlarged view of a main part of a first example of an embodiment of a flywheel magnet rotor according to the present invention.
FIG. 2 is an enlarged view of a main part of a second example of the embodiment of the flywheel magnet rotor according to the present invention.
FIG. 3 is an enlarged view of a main part of a third example of the embodiment of the flywheel magnet rotor according to the present invention.
FIG. 4 is a main part enlarged view of a fourth example of the embodiment of the flywheel magnet rotor according to the present invention.
FIG. 5 is an enlarged view of a main part of a fifth example of the embodiment of the flywheel magnet rotor according to the present invention.
FIG. 6 is a longitudinal sectional view of a conventional flywheel magnet rotor.
FIG. 7 is an enlarged view of a portion A in FIG. 6;
[Explanation of symbols]
REFERENCE SIGNS LIST 1 flywheel 1a cylindrical portion 1b bottom portion 1c boss portion 2 magnet case 3 permanent magnet 4 gripping piece 5 stop portion 6 welded portion 7a V-shaped concave portion 7b rectangular-shaped concave portion 8a V-shaped convex portion 8b rectangular-shaped convex portion 9 Falling step 10 Locking part 11 Rivet

Claims (5)

A flywheel having a tubular portion, a bottom portion closing one end of the tubular portion, and a boss protruding from the center of the bottom portion into the tubular portion; and a surface covered with a magnet case. A flywheel magnet rotor having a permanent magnet fixed to the inner periphery of the cylindrical portion of the flywheel,
The magnet case is attached to the outer periphery of the cylindrical portion covering the tip of the cylindrical portion of the flywheel, and the magnet case on the outer periphery of the cylindrical portion is fixed to the cylindrical portion by a stopper. Flywheel magnet rotor. The flywheel magnet rotor according to claim 1, wherein the stop is formed by a weld. The said stop part is formed with the recessed part provided in the outer periphery of the said cylindrical part, and the convex part provided in the said magnet case and latched by the said recessed part, The claim 1 characterized by the above-mentioned. Flywheel magnet rotor. The stop portion is formed by a falling step provided on the outer periphery of the cylindrical portion, and a locking portion provided on the magnet case and bent and locked along the falling step. The flywheel magnet rotor according to claim 1, wherein: 2. The flywheel magnet rotor according to claim 1, wherein the stop portion is formed by a rivet that is stopped through the cylindrical portion and the magnet case on the outer periphery of the cylindrical portion. 3.

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