JPH083181Y2 - Magnet generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a magnet generator, particularly a flywheel type magnet generator.

[Conventional technology]

A conventionally known rotor of this type of magnet generator will be described with reference to FIGS. 5 to 7. In the figure,
(1) is a bowl-shaped flywheel made of magnetic material, (1a)
Is a protrusion formed by extrusion molding on the inner peripheral side of the flywheel (1), and is provided in a portion where the magnet (2) described later is not located. (1b) is a step portion extruded on the inner circumference side at all the circumferences of the flywheel (1), and is provided corresponding to a magnet (2) described later. (2) is provided along the inner circumferential surface of the flywheel (1), and the step (1
a set of magnets positioned axially by b),
(3) is a tubular member fitted inside the pair of magnets (2) and is formed by drawing an iron plate or a stainless plate. By the way, since the iron plate is a magnetic material, it seems that the magnetic flux from the magnet (2) is short-circuited via the tubular member (3), and as a result, the magnetic flux from the magnet (2) does not reach the magneto coils. May be done. However, since the tubular member (3) is made of a thin plate material, even if a magnetic material is used, the magnetic flux is magnetically saturated with a small amount of magnetic flux and the magnetic flux does not flow. Therefore, most of the magnetic flux from the magnet (2) reaches the magneto coil, so that no problem occurs.
(3a) is a collar portion formed by bending one end of the tubular member (3), and axially positions the tubular member (3) with respect to the magnet (2). (4) is a molding material in which the magnet (2) and the tubular member (3) are fixed to the flywheel (1).

In the one configured as described above, the step (1b)
The flywheel (1), the magnet (2), and the tubular member (3) are axially positioned relative to each other by the collar portion (3a), and are integrally fixed by the molding material (4). . Here, the protrusion (1a) is the flywheel (1)
It goes without saying that the fixing between the mold material and the molding material (4) is made stronger.

[Problems to be solved by the invention]

However, since the tubular member (3) is formed by drawing a disk-shaped plate material, the material removal is poor, the material cost is high, and magnetic strain is generated by the drawing process. It had the drawback of poor magnetic properties. In addition,
Flywheel (1) and magnet (2) by step (1b)
Since it is axially positioned with, the step portion (1b) must be extruded on the thick flywheel (1), which is difficult to process and requires large-scale equipment. It has the drawback of low efficiency and high cost.

The present invention has been made to solve the above problems, and an object thereof is to obtain an inexpensive magnet generator having excellent magnetic characteristics.

[Means for solving problems]

In the magneto-generator according to the present invention, the first and second positioning parts are provided on one end side in the axial direction of the bent and formed tubular member.

[Action]

In this invention, since the tubular member is formed by simple bending, magnetic distortion does not occur. Further, since the magnet is axially positioned with respect to the flywheel via the tubular member, there is no need to provide a step portion for positioning on the flywheel.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In the figure, (3) is a tubular member formed by bending a thin plate material in the circumferential direction into an annular shape as shown in FIG. 4, and the joint portion is fixed by welding. (3b) is a first positioning portion that is in contact with the bottom of the flywheel (1),
(3c) is partially bent outward in the radial direction, and the magnet (2)
Is a second positioning portion with which is abutted. The other structure is similar to that of the conventional device, and the description thereof is omitted.

In the one configured as described above, the tubular member (3) is axially positioned with respect to the flywheel (1) by the first positioning portion (3b) provided on the tubular member (3), The second positioning portion (3c) provided on the tubular member (3) axially positions the magnet (2) with respect to the tubular member (3). Therefore, since the magnet (2) is also axially positioned with respect to the flywheel (1) via the tubular member (3), the flywheel (1) does not need a step for axial positioning. Further, here, since the tubular member (3) is a thin plate, the tubular member (3) and the first and second positioning portions (3
It goes without saying that the molding of b) and (3c) is very easy. Furthermore, since the tubular member (3) is formed by simply bending the plate material, the yield is good and no magnetic strain occurs.

[Effect of device]

As described above, according to the present invention, the flywheel, the magnet, and the tubular member can be axially positioned relative to each other with a simple structure in which the tubular member is provided with the first and second positioning portions, and the tubular member and the magnet can be positioned. By fixing and with a molding material, the tubular member can be thinned and the magnetic gap between the magnet and the generator coil can be reduced to obtain a high-output magneto-generator. Further, by bending the plate material to obtain a tubular member, magnetic distortion can be eliminated. Further, the magneto-generator of the present invention can be assembled by inserting each component only from the axial direction, and the assembly process can be easily automated.

[Brief description of drawings]

1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a perspective view showing a tubular member used in FIG. 1, and FIG. 4 shows a molding process thereof. FIG. 5 is a plan view showing the conventional device, FIG. 6 is a sectional view thereof, and FIG. 7 is a perspective view showing the tubular member used in FIG. In the figure, (1) is a flywheel, (2) is a magnet,
(3) is a tubular member, (3b) is the first positioning portion, (3c)
Is a second positioning unit. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic data Sho 56-156374 (JP, U) Real development Sho 56-83989 (JP, U) Real development Sho 58-156375 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A flywheel having a tubular portion and a side surface portion provided on the tubular portion, a plurality of magnets inserted from an axial direction of the flywheel and provided on an inner peripheral surface of the flywheel, and a circumference of the flywheel. A tubular member fitted inside the plurality of magnets, which is made of a plate material bent in the direction
A first positioning portion provided on one end side in the axial direction of the tubular member, the end surface on the one end side abutting the side surface of the flywheel for axially positioning the tubular member with respect to the flywheel, A second bent portion is provided at one end in the axial direction so as to be bent toward the outer peripheral side in the radial direction, and the plurality of magnets are brought into contact with respective end surface portions to axially position the plurality of magnets with respect to the tubular member. A magnet power generator comprising a positioning part and a molding material that integrally fixes the plurality of magnets and the tubular member, and axially positions the plurality of magnets with respect to the flywheel via the tubular member. Machine.