JPH0736559U - Flywheel magnet rotor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a flywheel magnet rotor capable of preventing the protective resin molding from falling off. [Arrangement] An arc-shaped magnet mounting surface 2a is provided on a part of the outer periphery of a cup-shaped flywheel, and this magnet mounting surface 2a
The one magnetic pole surface 3a of the arc-shaped permanent magnet 3 is brought into contact with.
The arc-shaped magnetic pole piece 4 is brought into contact with the other magnetic pole surface 3b of the permanent magnet 3. A protective resin molded body 6 is provided on the outer periphery of the laminated body 5 of the permanent magnet and the pole piece so as to surround the laminated body 5. The laminated body 5 is fixed to the magnet mounting surface 2a with a screw 8 at the center thereof. A retreat portion 14 is provided at the peripheral edge of one magnetic pole surface 3 a of the permanent magnet 3, and the retreat portion 1 of the one magnetic pole surface 3 a is provided on the protective resin molding 6.
The retaining projection 6a that locks with the No. 4 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flywheel magnet rotor used as a rotor of a magnet generator.

[0002]

[Prior art]

 As a generator mounted on an internal combustion engine, a magnet generator composed of a flywheel magnet rotor and a stator having a generator coil is often used.

As shown in FIGS. 3 and 4, a conventional flywheel magnet rotor 1 has a cup-shaped flywheel 2, and an outer periphery of the flywheel 2 is partially recessed into an arc shape. The magnet mounting surface 2a is provided. One magnetic pole surface 3a of the arc-shaped permanent magnet 3 is in contact with the magnet mounting surface 2a, and an arc-shaped magnetic pole piece 4 is in contact with the other magnetic pole surface 3b of the permanent magnet 3. A protective resin molding 6 is provided around the outer periphery of the laminated body 5 of the permanent magnet 3 and the pole piece 4 so as to surround the laminated body 5. A locking projection 4a is provided on the outer periphery of the magnetic pole piece 4, and the locking projection 4a is cut into the protective resin molding 6. In the laminated body 5, a screw 8 as a fastening means, which is passed through a hole 7 provided at the center of the laminated body 5, is screwed into a screw hole 9 of the magnet mounting surface 2a of the flywheel 1 so that the magnet mounting surface is It is fixed to 2a.

On the outer periphery of the flywheel magnet rotor 1 having such a structure, a stator 12 in which a magneto coil 11 is wound around a U-shaped stator iron core 10 is provided, and an end portion of the stator iron core 10 has a magnetic pole. It is arranged so as to face the surface 3b via the gap 13, and is fixed to a fixing system (not shown).

In the flywheel magnet rotor 1 described above, the protective resin molding 6 is provided on the outer periphery of the laminated body 5 of the permanent magnet 3 and the pole piece 4 because the permanent magnet 3 is usually a ferrite magnet. This is to protect the magnets of this type because they are fragile.

The protective resin molded body 6 is formed by injection molding in which the laminated body 5 of the permanent magnet 3 and the pole piece 4 is used as a core in a molding die, and the protective resin is injected into the molding die. . In this case, the one magnetic pole surface 3a of the permanent magnet 3 cannot be covered with the protective resin molding 6 because it is brought into contact with the magnet mounting surface 2a of the flywheel 1.

[0007]

[Problems to be solved by the device]

 However, in such a conventional flywheel magnet rotor 1, since the protective resin molded body 6 covers only the outer periphery of the laminated body 5 of the permanent magnets 3 and the pole pieces 4, centrifugal force is generated during use. There was a problem of getting out.

An object of the present invention is to provide a flywheel magnet rotor capable of preventing the protective resin molding from falling off.

[0009]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described. In the present invention, one magnetic pole surface of a permanent magnet is brought into contact with a magnet mounting surface provided on a part of the outer circumference of a cup-shaped flywheel. A magnetic pole piece is brought into contact with the other magnetic pole surface of the magnetic pole piece, and a protective resin molding is provided around the laminated body of the permanent magnet and the magnetic pole piece so as to surround the permanent magnet and the magnetic pole piece. In the flywheel magnet rotor, the body is fixed to the magnet mounting surface of the flywheel at its central portion by fastening means, and a retreat portion is provided at a peripheral edge portion of one magnetic pole surface of the permanent magnet, and the protective resin is provided. It is characterized in that the molded body is provided with a retaining projection which is engaged with the retracted portion of one magnetic pole surface of the permanent magnet.

[0010]

[Action]

 In this manner, when the recessed portion is provided on the peripheral edge portion of one magnetic pole surface of the permanent magnet, and the protection resin molded body is provided with the retaining projection that is locked to the retracted portion of one magnetic pole surface of the permanent magnet, The protective resin molded body is locked to the retracted portion of one of the magnetic pole surfaces of the permanent magnet by the retaining protrusion, and is prevented from falling off due to centrifugal force.

In this case, a retreat portion is provided on one magnetic pole surface of the permanent magnet, and when the retaining projection of the protective resin molded body is locked to the retreat portion, the one pole surface of the permanent magnet is formed. Even if the retaining projection of the protective resin molded body is locked, it is possible to avoid that one magnetic pole surface of the permanent magnet is lifted and fixed from the magnet mounting surface of the flywheel.

[0012]

【Example】

 1 and 2 show an embodiment of a flywheel magnet rotor according to the present invention. The parts corresponding to those in FIGS. 3 and 4 described above are designated by the same reference numerals.

In the flywheel magnet rotor 1 of the present embodiment, by providing a flat portion along the peripheral edge portion of the one magnetic pole surface 3a forming the arc shape of the permanent magnet 3, the peripheral edge of the one magnetic pole surface 3a is formed. The protection resin molded body 6 is provided with a retaining projection 6a which is engaged with the retreat portion 14 of one magnetic pole surface 3a of the permanent magnet 3 on the entire periphery thereof. ing. Such a retaining protrusion 6a is formed together with the protective resin molded body 6 during molding.

In this way, the retreat portion 14 is provided at the peripheral edge portion of the one magnetic pole surface 3 a of the permanent magnet 3, and the protective resin molding 6 is locked to the retreat portion 14 of the one magnetic pole surface 3 a of the permanent magnet 3. When the retaining protrusion 6a is provided, the protective resin molded body 6 is locked by the retaining protrusion 6a to the retreat portion 14 of the one magnetic pole surface 3a of the permanent magnet 3 and is prevented from dropping due to centrifugal force. R.

In this case, since the receding portion 14 is particularly provided on the one magnetic pole surface 3a of the permanent magnet 3, the retaining projection 6a of the protective resin molding 6 is locked to the receding portion 14. Also, it is possible to avoid that one magnetic pole surface 3a of the permanent magnet 3 is lifted from the magnet mounting surface 2a of the flywheel 2 and fixed.

It should be noted that the receding portions 14 provided on the peripheral portion of the one magnetic pole surface 3 a of the permanent magnet 3 are provided at intervals in a part of the circumferential direction, and the retaining projections 6 a of the protective resin molding 6 are also these receding portions. It can also be provided corresponding to 14.

[0017]

[Effect of device]

 As described above, in the flywheel magnet rotor according to the present invention, the permanent magnet is provided with a retreating portion at the peripheral edge of one magnetic pole surface, and the protective resin molded body is provided with the retreating portion of one magnetic pole surface of the permanent magnet. Since the retaining projection is provided to be locked to the protection resin molding, the protection resin molding is retained by the retaining projection at the retreat portion of one magnetic pole surface of the permanent magnet. Can be prevented from falling off by centrifugal force.

In the present invention, since the recessed portion is provided on one of the magnetic pole surfaces of the permanent magnet, even if the retaining projection of the protective resin molding is locked in the recessed portion, It is possible to avoid that the magnetic pole surface of the is lifted from the magnet mounting surface of the flywheel and fixed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state before assembling a main part in an embodiment of a flywheel magnet rotor according to the present invention.

FIG. 2 is a cross-sectional view showing a state after assembly of FIG.

FIG. 3 is a front view of a conventional magnet generator having a flywheel magnet rotor.

FIG. 4 is a cross-sectional view showing a state of a main part of a conventional flywheel magnet rotor before assembly.

[Explanation of symbols]

 1 flywheel magnet rotor 2 cup-shaped flywheel 2a magnet mounting surface 3 permanent magnet 3a one magnetic pole surface 3b the other magnetic pole surface 4 magnetic pole piece 5 laminated body 6 protective resin molded body 7 hole 8 screw 9 screw hole 10 fixed iron core 11 Generator coil 12 Stator 13 Gap 14 Retreat part

Claims (1)

[Scope of utility model registration request] 1. A magnetic pole surface of one of the permanent magnets is brought into contact with a magnet mounting surface provided on a part of the outer circumference of a cup-shaped flywheel, and a magnetic pole piece is brought into contact with the other magnetic pole surface of the permanent magnet. A protective resin molding is provided around the outer periphery of the laminated body of the permanent magnets and the magnetic pole pieces, and the laminated body of the permanent magnets and the magnetic pole pieces is attached to the flywheel at the central portion by fastening means. In the flywheel magnet rotor fixed to the magnet mounting surface of the permanent magnet, a retreat portion is provided at a peripheral edge portion of one magnetic pole surface of the permanent magnet, and the protective resin molded body has one magnetic pole surface of the permanent magnet. A flywheel magnet rotor, characterized in that it is provided with a retaining projection that is locked to the retreat portion.