JPH0739095A - Method for manufacturing rotor of magnet generator - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the amount of protrusion of the magnet axial positioning part. [Structure] A plurality of magnets 20 are accommodated in a yoke 11, and a cover 30 is press-fitted inside the magnet group. The inner flange portion 33 of the cover tubular wall 31 has the yoke closing wall 14
Fixed to. The overhanging tool 62 is opposed to the yoke closing wall side portion of the cover tubular wall 31, and the overhanging tool 62 is mechanically moved radially outward by the stroke conversion means 63, 70, whereby the yoke of the cover tubular wall 31. The facing portion of the projecting tool 62 on the side of the closing wall 14 is projected outward in the radial direction, so that the axial positioning portion 38 causes the magnets 2 to move.
No. 0 is formed on the side of the end surface on the yoke closing wall side. [Effect] Since the amount of protrusion of the axial positioning portion that is formed to bulge on the cylindrical wall of the cover is mechanically determined by the axial stroke, even if the amount of protrusion is a large optimum value, it can be as simple and high as desired. The accuracy can be set, and the set overhang amount can be stably reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a magnet generator, and more particularly to improvement of a permanent magnet fixing structure, for example, rotation of a magnet generator mounted on a small or special vehicle such as a motorcycle or a buggy. Regarding what is effective for children.

[0002]

2. Description of the Related Art Generally, in a small or special vehicle such as a motorcycle or a buggy, a magnet generator using a permanent magnet (hereinafter referred to as a magnet) such as a ferrite magnet may be used.

In this type of magnet generator, a rotor is constructed by arranging and fixing a plurality of magnets at equal intervals on the inner circumference of a yoke, and coils are wound around a plurality of radial portions of a core. The rotor is driven by an engine to rotate around the electron emitter, so that an electromotive force is induced in each magnetic pole coil of the electron emitter. ing.

Conventionally, as a rotor used in such a magneto-generator, a case is formed in which a plurality of magnet accommodating chambers each having a shape corresponding to a magnet are formed by annularly connecting an upper open frame into a yoke. The magnet is inserted into each of the housing chambers of the case, and is clamped and fixed between the partition walls between the adjacent housing chambers,
Further, a tubular cover is fitted inside the case and the magnet, and a resin pressing ring is brought into contact with the outer flange portion of the cover, and then the winding and crimping margin portion formed on the outer periphery of the upper end portion of the yoke is removed. There is one in which a plurality of magnets are integrated with a yoke by winding and crimping on a pressing ring.

Further, as rotors of conventional magnet generators of this type, there are those disclosed in JP-A-60-187248 and JP-A-61-280747.

The rotor of the former magnet generator is composed of an iron bowl, a magnet mounted on the inner circumference of the iron bowl, a magnet protection cover arranged on the inner circumferential surface of the magnet, a bottom surface of the iron bowl, the magnet and the magnet. It is provided with an adhesive reservoir space formed by the protective cover, an adhesive injection hole provided on the bottom surface of the iron bowl between the inner peripheral surface of the iron bowl and the magnet protective cover.

In the rotor of the latter magnet generator, the cylindrical portion of the magnet protection member is pressed against the inner peripheral surface of a plurality of arc-shaped magnets arranged on the inner peripheral surface of the iron bowl, and the flange of this magnet protective member is pressed. Part of the magnet to abut the end face of the magnet on the opening end side to regulate the axial movement of each magnet, and to fix the fixed part of the magnet protection member to the bottom of the iron bowl, and to fix the iron bowl of the cylindrical part of the magnet protection member. The outer shape of the bottom side is tapered so that it is smaller than the inner diameter of each magnet array, and a bulging portion that bulges outward in the space between the magnets is formed in the cylindrical portion of the magnet protection member. By
The magnets are fixed to the iron bowl by fixing the magnet protection member to the iron bowl. In addition, the bulging portion absorbs the deformation of the magnet protection member when the magnet protection member is press-fitted, and the outer shape of the fixed portion side of the cylindrical portion of the magnet protection member is smaller than the inner diameter of each magnet array. With this configuration, the deformation of the magnet protection member on the side of the fixed portion is reduced, and the magnet protection member can be reliably fixed to the iron bowl by the fixed portion.

By the way, as a manufacturing method of a permanent magnet excitation type starter, there is one described in Japanese Patent Publication No. 62-36458. That is, according to this manufacturing method, the magnet is inserted from one end of the yoke until it engages with the protrusion of the yoke, and at the same time, the magnet cover having the bottom cylindrical portion connecting portion skirt portion is press-fitted from the other end of the yoke to form the first joining portion. After forming the second joining portion, the third joining portion, and the first overhanging portion, the elastic body disposed on the inner circumference of the bottom side of the magnet cover is compressed to form a U-shaped It is characterized in that two projecting portions are formed.

[0009]

However, in the rotor of the conventional magnet generator in which the magnet case is used, not only the number of parts and the number of assembling steps are increased due to the magnet case, but the magnet is magnetized. Since it is press-fitted into the case, strict control of the magnet dimensions is required.Also, the allowance for absorbing the dimensional variation of the magnet, the holding ring and the crimping allowance, and the axial direction of the rotor of the magnet generator The dimension of becomes longer.

Further, in the rotor of the magnet generator and the method of manufacturing the same, which is proposed in Japanese Patent Laid-Open No. 60-187248, an adhesive is used, so that workability is deteriorated.

Further, in both of the rotors of the magnet generator proposed in Japanese Patent Laid-Open No. 60-187248 and Japanese Patent Laid-Open No. 61-280747, the axial positioning of each magnet is the bottom of the iron bowl. Since it is performed on the wall side, variations in the axial dimension of each magnet are absorbed on the opening side of the iron bowl, and as a result, the axial dimension of the rotor of the magnet generator becomes long.

A first object of the present invention is to fix a magnet without using a magnet case and an adhesive and to reduce the axial dimension as much as possible. It is to provide a manufacturing method of.

By the way, as a method of manufacturing this magnet generator, the present inventor has considered applying a manufacturing method of a permanent magnet excitation type starter described in Japanese Patent Publication No. 62-36458. However, when the method is simply applied to the manufacturing method of the rotor of the magnet generator, the present inventor has revealed that the following problems occur.

(1) The amount of protrusion of the magnet in the radial direction of the cover cylinder wall with respect to the axial stroke becomes unstable due to the variation and deterioration of the elastic body, and the variation in the thickness and hardness of the cover, so that Fixed force becomes unstable. (2) Since the shape of the projecting portion that secures the axial positioning of the magnet has a gentle angle, the fixing force of the magnet by the projecting portion is small. (3) It is difficult to set a large radial projection amount of the cover cylinder wall with respect to the axial stroke.

A second object of the present invention is to provide a method of manufacturing a rotor of a magneto generator capable of solving the above-mentioned problems.

[0016]

According to the method of manufacturing a rotor of a magnet generator according to the present invention, a plurality of magnets are arranged at intervals on the inner circumference of a substantially bowl-shaped yoke, and the inside of the magnet is In a method of manufacturing a rotor for a magnet generator in which a tubular cover is fitted in, a step of temporarily placing the magnets in the yoke while accommodating a plurality of magnets in the yoke, and pressing the cover inside the magnet group A step of fixing an inner collar portion projecting radially inward at an end of the cover cylindrical wall on the side of the yoke closing wall to the closing wall of the yoke; An overhanging tool is opposed to a portion of a space between the yoke closing wall side end surface, and the overhanging tool uses a stroke converting means for mechanically converting an axial stroke into a radial stroke. By being moved in the direction outwards,
A portion of the cylindrical wall of the cover facing the yoke closing wall on the side of the yoke closing wall, the portion facing outwardly in the radial direction, and the axial positioning portion is formed on the yoke closing wall side end surface side of each magnet. It is characterized by

[0017]

According to the above-mentioned means, the amount of protrusion of the axial positioning portion of the magnet bulgingly formed on the cylindrical wall of the cover is determined by the axial stroke. Therefore, even if the amount of protrusion is a large optimum value, it is desirable. Accordingly, it is possible to set easily and highly accurately, and it is possible to stably reproduce the set overhang amount.

Moreover, since the axial positioning portion of the magnet is bulged in the horizontal direction, the amount of overhang can be set to a large optimum value, and the fixing force of the axial positioning portion with respect to the magnet is increased. Can be set.

With the outer flange portion of the cover in contact with the upper surface of each magnet, the portion of the space between the yoke closing wall of the cylindrical wall of the cover and the end surface of the magnet on the yoke closing wall side is directed radially outward. By bulging, each magnet can be fixed in a state of being sandwiched by the outer flange portion of the cover and the axial positioning portion bulging on the yoke closing wall side portion of the cover cylinder wall. The height positions of the magnets are aligned on the outer flange of the cover, and the dimensional variations of the magnets in the height direction are absorbed by the overhanging parts of the cover on the yoke closing wall side. The axial length of the rotor can be shortened.

[0020]

1 (a), 1 (b) and 1 (c) are partially cut perspective views showing a method of manufacturing a rotor of a magneto generator according to an embodiment of the present invention. FIG. 2 shows a yoke, (a)
Is a partially omitted plan view, (b) is a front sectional view taken along line bb of (a), and (c) is a partially omitted bottom view. FIG. 3 shows a cover, (a) is a partially omitted plan view, (b) is a front sectional view, and (c) is a partially omitted bottom view. FIG. 4 shows a rotor of a magneto-generator manufactured by a method of manufacturing a magneto-generator according to an embodiment of the present invention, (a) is a plan view, (b) is (b) -b of (a). It is a front sectional view which follows a line. FIG. 5 and subsequent drawings are explanatory views showing each step in the method for manufacturing the rotor of the magneto-generator which is an embodiment of the present invention.

In the present embodiment, the rotor of the magnet generator manufactured by the method for manufacturing the rotor of the magnet generator according to the present invention comprises a yoke, a plurality of magnets, and a cover.

The yoke 11 is integrally formed in a substantially bowl shape whose upper surface is opened and whose lower surface is closed by a magnetic material, and the reluctor 13 has a predetermined width in the circumferential direction and the axial direction on the cylindrical cylindrical wall 12. Projected outward in the direction. A shaft hole 1 for inserting a boss (not shown) for directly connecting the rotor to the engine is formed in the lower surface closing wall 14 of the yoke 11.
5 are mainly opened. Bottom wall 1 of yoke 11
A pair of circular holes 16 used for mounting a yoke positioning jig, which will be described later, are formed at the outer positions of the shaft holes 15 of No. 4 on the concentric circles with a phase difference of 180 degrees. Further, a plurality of elliptical holes 17 for inserting a magnet axial direction setting jig, which will be described later, are provided in the outer peripheral portion of the closing wall 14 of the yoke 11 (in the present embodiment,
12 pieces), and are provided at equal intervals in the circumferential direction on a concentric circle.

Further, the bottom surface of the closing wall 14 of the yoke 11 is provided with a plurality of convex portions 18 (8 in the present embodiment) for fixing the cover, a group of circular holes 16 and a group of elliptical holes 17. They are arranged at equal intervals in the circumferential direction on concentric circles between them, and a part of the closing wall 14 is pushed up from the outer surface so as to project inward in the axial direction. This convex portion 18 covers the cover as will be described later. It is configured so that it can be caulked by being inserted into a fixing hole formed in the.

The closed wall 14 of the yoke 11 is provided with a plurality of female screw holes 19 for attaching a cooling fan, which are provided at equal intervals in the circumferential direction on a concentric circle near the group of circular holes 16. Further, no winding and crimping margin is provided on the opening edge of the cylindrical wall 12 of the yoke 11.

The magnet 20 has a height equal to or less than the depth of the yoke 11, and is integrally molded into a substantially rectangular parallelepiped having a circular arc shape curved along the inner circumference of the yoke 11 in the width direction. Inclined surface portions 23 are formed at both left and right ends of an arc-shaped inner peripheral surface (hereinafter referred to as abdominal surface) 21 of the magnet 20 so as to come closer to an outer peripheral surface (hereinafter referred to as a rear surface) 22 toward both left and right ends. ing. The rising side surfaces 24 and 24 on both sides are formed so as to be at right angles to the tangent to the normal line passing through the center of the yoke 11, and the upper surface 25 and the lower surface 26 are formed parallel to each other.

The cover 30 is made of a metal material such as a thin iron plate and is integrally formed by drawing and pressing. The cover 30 is formed into a substantially cylindrical shape that is press-fitted into a cylinder formed by a group of magnets 20 described later. That is, the cover 30 has a circular cylindrical wall 31, and the outer diameter of the cylindrical wall 31 is slightly larger than the inner diameter of the cylinder formed by the magnets 20. An outer flange portion 32 is formed at one end (hereinafter, referred to as an upper end) of the cylindrical wall 31 of the cover 30 in a circular donut shape protruding outward in the radial direction.

Before assembly, an inner flange 33 is integrally formed in a circular donut shape at the lower end of the cylindrical wall 31 of the cover 30. The inner diameter of the inner flange portion 33 is smaller than the arrangement diameter of the group of convex portions 18 arranged on the yoke 11, and is set to be equal to or slightly larger than the arrangement diameter of the circular holes 16, 16. In the radial middle portion of the inner flange portion 33, the same number of fixing holes 34 as the convex portions 18 group of the yoke 11 (8 in this embodiment) are arranged so that each of them is aligned with the convex portion 18 group of the yoke 11. It is opened in each of the fixing holes 34
Are formed so that the respective convex portions 18 can be inserted respectively.

A notch 3 is formed on the inner peripheral edge of the inner flange 33.
A plurality of (5 in this embodiment) 5 are formed in a substantially semi-circular shape, and the yoke 1 is formed by the group of the notches 35.
The group of 16 circular holes and the group of 19 female screw holes can be appropriately escaped. Further, a rigidity-imparting portion 36 is formed by bending and bending over the entire circumference including the cutout portion 35 at the inner peripheral edge of the inner flange portion 33. The rigidity imparting portion 36 is formed by bending the inner peripheral edge portion of the inner collar portion 33 inward in the axial direction to a constant height over the entire circumference by drawing or the like, and imparts sufficient rigidity when the cover 30 described later is press-fitted. It is like this.

Next, a method of manufacturing the rotor of the magneto-generator, which is an embodiment of the present invention, will be described for the case where each component having the above-mentioned configuration is used.

First, as shown in FIGS. 1A and 5, the yoke 11 is set on the base 41 of the manufacturing apparatus 40 for the rotor of the magnet generator. At this time, the yoke 1
A pair of yoke positioning jigs 42, 42 are respectively inserted into the pair of circular holes 16, 16 in FIG. Also,
A magnet circumferential direction positioning jig (hereinafter, referred to as a magnet first jig) 43 and a magnet axial direction setting jig (hereinafter, referred to as a magnet second jig) 44 are inserted into the oval holes 17 group. It

The magnet first jig 43 group and the magnet second jig 44 group are floatingly supported on the base 41 by springs 45, respectively, and are movable in the vertical direction. The same number of magnets as the first jig 43 group (four magnets in this embodiment) as the magnets 20 are arranged at equal intervals in the circumferential direction on a circle concentric with the array diameter of the oblong holes 17 group. Also,
Shoulders 43a and 43a are formed on both side edges in the circumferential direction of each magnet first jig 43, respectively. The other magnet second jig 44 group is the number obtained by subtracting the number of the magnets 20 from the number of the oblong hole 17 groups (in the present embodiment,
8) are arranged on both sides of each first jig 43 on a circle concentric with the array diameter of the group of elliptical holes 17.

Subsequently, as shown in FIGS. 1A and 5, a plurality (four in this embodiment) of magnets 20 are arranged in a circular ring shape in the yoke 11. At this time, the bottom surface 26 of the magnet 20 is placed on each of the two second jigs 44 with the back surface 22 being in contact with the inner peripheral surface of the yoke 11, and both side surfaces 2 are
4, 24 are on the side surfaces of the first jigs 43, 43 on both sides, and the end portions of the lower surface 26 are shoulder portions 43a, 43 of the first jigs 43, 43.
a respectively engaged. In this state, the magnet 20 is positioned in the circumferential direction by the first jig 43. Further, the magnet 20 is positioned at the upper limit by the second jigs 44, 44 and is in a state of being floatingly supported in the vertical direction.

Next, as shown in FIGS. 1A and 6, inside the group of magnets 20 annularly aligned with the inner circumference of the yoke 11, a circular inner peripheral surface of the group of magnets 20 is formed. The cover 30 formed in a cylindrical shape having an outer diameter slightly larger than the diameter of is inserted by the fitting tool 50. Along with this press-fitting, portions of the cylindrical wall 31 of the cover 30 that face each other between the adjacent magnets 20, 20 are bulged into the respective spaces to form the circumferential positioning portions 37 of the respective magnets. It

Here, the outer diameter of the fitting tool 50 is formed in a two-step cylindrical shape having a small diameter on the lower side and a large diameter on the upper side, and the small diameter portion 51 on the lower side is slightly smaller than the inner diameter of the cylindrical wall 31 of the cover 30. The small diameter and the large diameter portion 52 on the upper side are formed to have substantially the same diameter as the outer diameter of the outer flange portion 32 of the cover 30.

The fitting tool 50 has the same number of yoke positioning holes 53 as the circular holes 16 (two holes in this embodiment), which are provided in the axial direction. The yoke positioning jigs 42 are relatively inserted into the respective yoke positioning holes 53, so that the fitting tool 50, the yoke 11 and the magnet 20 group are circumferentially positioned.

On the lower surface of the small-diameter portion 51 of the fitting 50, the same number of insertion holes 54 as the convex portions 18 of the yoke 11 (8 in this embodiment) are provided in the axial direction. Further, an annular groove 55 is recessed in the lower surface of the small diameter portion 51 of the fitting tool 50 so as to accommodate the rigidity imparting portion 36 of the cover 30. Due to the above-described positioning state, each protrusion 1 is inserted into each insertion hole 54.
8 and the rigidity imparting portion 36 is inserted into the annular groove 55 in alignment with each other, and interference of the fitting tool 50 with the convex portion 18 and the rigidity imparting portion 35 is avoided.

By the way, the magnet 2 of the cover 30
When the circumferential positioning portions 37 of the cylindrical wall 31 are bulged by press-fitting into the group 0, the inner flange portion 3 of the cover 30
Since a secondary stress due to the bulging deformation acts on 3, the inner collar portion 33 tries to deform irregularly (irregularly) in a wavy state.

However, in this embodiment, the inner collar portion 3
Since the rigidity-imparting portion 36 is formed by bending on the inner peripheral portion of 3, the rigidity-imparting portion 36 resists this stress even when a stress that deforms the inner flange 33 into a wavy state is applied. By doing so, it is possible to prevent the inner collar portion 33 from being irregularly deformed into a wavy state. Therefore, as will be described later, when the fixing convex portion 18 is fitted into the fixing hole 34 and the fixing convex portion 18 is caulked, the inner flange portion 33 of the cover 30 causes the inner wall portion 33 of the yoke 11 to close.
When fixed to No. 4, the inner flange portion 33 is properly fixed without being adversely affected by irregular deformation.

When the cover 30 is press-fitted into the group of magnets 20, the cover 3 is attached to the outer flange portion 32 and the inner flange portion 33.
Since the large-diameter portion 52 and the small-diameter portion 51 of the fitting 50 for urging the pushing force to 0 or the reaction force opposite thereto can be engaged with each other, the pressing force is uniformly applied to the entire cover 30. Can be energized. By uniformly urging the press-fitting force, axial folds (horizontal stripes) are generated on the cylinder wall 31 as the cover 30 is press-fitted, and the cylinder wall 31, the outer flange portion 32, and the inner flange portion 33 are formed. Can be prevented from irregularly deforming, and more precise press-fitting can be realized.

The outer flange 3 is provided on the upper edge of the cover 30.
2, since the inner flange portions 33 are formed on the lower end sides, respectively, even if the cover 30 is formed of a thin iron plate,
The cylinder wall 31 has sufficient rigidity. Therefore, the cover 30 can be smoothly press-fitted into the magnet 20 group, and adjacent to the cylinder wall 31 so that the outer peripheral surface of the cylinder wall 31 of the cover 30 uniformly and uniformly adheres to the inner peripheral surface of the magnet 20 group. The circumferential direction positioning portion 37 is appropriately formed in each portion of the matching magnets 20, 20 facing the space.

When the cover 30 is press-fitted into the magnet group 20 up to the final stroke, the inner flange portion 33 is in contact with the bottom surface of the closing wall 14 of the yoke 11. In this state, the respective fixing holes 34 formed in the inner collar portion 33 are connected to the yoke 1
The fixing projections 18 provided on the bottom surface of the first closing wall 14 are fitted into each other.

In this state, as shown in FIGS. 1B and 7, the caulking tool 5 is inserted into the insertion hole 54 of the fitting tool 50.
When 6 is inserted, the protruding end portion of the convex portion 18 of the yoke 11 inserted into the fixing hole 34 of the cover 30 is caulked. The cover 30 is fixed to the closing wall 14 of the yoke 11 in a circular ring shape along the entire circumference of the inner flange portion 33 by the group of the convex portions 18 after the caulking process.

Next, after the fitting tool 50 is removed, FIG.
As shown in (c) and FIG. 8, the plastic device 60 is inserted inside the cover 30. By this plastic device 60, the magnet axial direction positioning portion 38 is provided on the inner flange portion 33 side of the cylindrical wall 31 of the cover 30 and the magnet 20.
In the space between the lower surface 26 of the group and the yoke closing wall 14, a circular annular shape is formed along the lower surface 26 of the magnet, or at least the lower surface of the magnet is also bulged.

Here, the plastic device 60 has a main body arranged on the lower side and an operating tool arranged on the upper side. When the plastic device 60 is inserted inside the cover 30, the main body 61 is pressed against the bottom wall 14 of the yoke 11, and a plurality of overhanging tools 62 (main In the embodiment, four units are arranged in a radial pattern (in the present embodiment, in a cross shape) and are slidably mounted inside and outside in the radial direction. The radially outer end surface of each projecting tool 62 faces the cylindrical wall 31 of the cover 30 from the inside in a normal line.

At the radially inner end of each overhang 62,
The driven-side inclined surface portions 63, which are one of the stroke conversion means, are provided so as to project vertically upward, and the inclined surfaces are formed at the upper ends of the inclined surface portions 63 so as to rise outward. A compression spring 64 is interposed between the radially outer side surface of each inclined surface portion 63 and the radially inner side surface of the main body 61 in a force-accumulating state. Therefore, each of the projecting tools 62 is always urged inward in the radial direction by the spring 64 and is in a standby state at the retracted position. Also,
Directly above each inclined surface portion 63 of the main body 61, each guide hole 65 is formed in the vertical direction.

On the other hand, the operating tool 66 is slidably fitted in the main body 61 in the vertical direction. The outer diameter of the operation tool 66 is formed in a two-step cylindrical shape with a small diameter on the lower side and a large diameter on the upper side
The outer diameter of the lower small diameter portion 67 is slightly smaller than the inner diameter of the cylindrical wall 31 of the cover 30, and the outer diameter of the upper large diameter portion 68 is the cover 3
The outer diameter of the outer flange portion 32 is zero and the outer diameter of the outer collar portion 32 is substantially the same.

A guide recess 69 is concentrically arranged on the lower surface of the small-diameter portion 67 of the operation tool 66 and is recessed. The outer peripheral surface of the main body 61 is slidably fitted into the inner peripheral surface of the guide recess 69. Has been done. On the lower surface in the guide concave portion 69, each driving side inclined surface portion 70 which is the other of the stroke converting means is arranged so as to face the driven side inclined surface portion 63, and is projected downward in the vertical direction. An inclined surface is formed at the lower end of the side inclined surface portion 70 so as to rise outward. The driving-side inclined surface portions 70 are slidably fitted in the guide holes 65 of the main body 61, and the downward-facing inclined surfaces of the driving-side inclined surface portions 70 are the driven-side inclined surface portions 63.
Are slidably abutted on the upward inclined surfaces.

Each of the overhanging tools 62 corresponds to the cylindrical wall 31 of the cover 30.
When the operating tool 66 is lowered in a state of being opposed to the bottom of the driving tool, the driven-side tilted surface portion 63 relatively slides on the driving-side tilted surface portion 70, so that each of the overhanging tools 62 is pushed outward in the radial direction. . By the outward movement of each of the projecting tools 62, the inner flange portion side of the cylindrical wall 31 of the cover 30 bulges outward in the radial direction, so that the axial positioning portion 38 of the magnet is formed in an annular shape.

Simultaneously with the bulging of the axial positioning portion 38 of the cover 30, the lower surface of the large-diameter portion 68 of the operating tool 66 pushes down the outer flange portion 32 of the cover 30, so the axial positioning portion 38 of the cover 30 is formed. It does not have to be formed by pulling only the portion between the magnet end surface 26 and the inner flange portion 33, but is formed with the extra thickness of the cylinder wall 31 that is pushed down. Therefore, due to the bulging molding of the axial positioning portion 38, the inner flange portion 33 of the cover 30 is torn off, or the axial positioning portion 38 becomes an extremely thin portion, and the magnet fixing strength decreases. There is no such thing.

On the other hand, when the lower surface of the outer collar portion 32 of the cover 30 which is pushed down contacts the upper surface 25 of each magnet 20, each magnet 20 is pushed upward by each second magnet jig 44. Since the magnets 20 are supported in a floating manner, the heights of the magnets 20 are aligned on the lower surface of the outer flange portion 32 of the cover 30, that is, the lower surface of the large diameter portion 62 of the operating tool 66.

Further, the overhang amount A of the axial positioning portion 38 is mechanically determined by the inclination angle B between the two inclined surface portions 63 and 70, which are stroke conversion means, and the axial stroke C of the driving side inclined surface portion 70. Since it is determined, the optimum value can be set as desired, and the set overhang amount can be stably reproduced.

Even when the overhang amount A is set to be large, the lower surface of the large diameter portion 68 of the operating tool 66 is covered by the cover 30 when the axial positioning portion 38 of the cover 30 is bulged.
By pushing down the outer flange portion 32 of the cover 30, the axial positioning portion 38 is formed with the extra thickness of the cylindrical wall 31 of the cover 30, so that the cover 30 is bulged due to the axial molding of the axial positioning portion 38. The cylindrical wall 31 is not torn off, and the axial positioning portion 38 does not become an extremely thin portion, and the magnet fixing strength does not decrease.

After the axial positioning portion 38 is formed, the operating tool 66 is raised. When the operating tool 66 is raised, the respective overhanging tools 62 are retracted radially inward by the respective springs 64. Then, the operating tool 66 and the plastic device 60 of the main body 61 are pulled out upward from the inside of the cover 30. Next, the yoke 11 is reset from above the base 41.

Through the above steps, the rotor of the magneto generator shown in FIG. 4 is manufactured. That is, the magnets 20 are sandwiched and fixed between the outer flange portion 32 and the axial positioning portion 38 in a state where the heights of the magnets 20 are aligned with the lower surface of the outer flange portion 32 of the cover 30.

According to the above described embodiment, the following effects can be obtained. (1) The overhang amount A of the axial positioning portion 38 is mechanically determined by the inclination angle B between the two inclined surface portions 63 and 70, which are stroke conversion means, and the axial stroke C of the driving side inclined surface portion 70. Even if the amount is a large optimum value, it can be easily and accurately set as desired, and the set overhang amount can be stably reproduced.

(2) Since the axial positioning portion 38 is bulged in the horizontal direction by the overhanging tool 62, the fixing force of the axial positioning portion 38 to the magnet 20 should be set to be large together with the above (1). You can

(3) Since the rigidity imparting portion 36 is formed on the inner peripheral portion of the inner collar portion 33 of the cover 30, when the cover 30 is press-fitted inside the magnet 20, the rigidity imparting portion 36 is formed on the inner collar portion 33. Even if a stress for deforming into a wavy state acts, the rigidity imparting portion 36 sufficiently resists this stress, so that the inner brim portion 33 is prevented from being irregularly deformed into a wavy state. . Therefore, the inner flange portion 33 of the cover can be properly fixed to the closing wall 14 of the yoke 11.

(4) The radial positioning portion 37 formed by the cylindrical wall 31 of the cover 30 bulging outward in the radial direction is uniformly pushed into the space between the adjacent magnets 20, 20 over the entire axial length of the magnet. As a result, the magnets 20 are reliably positioned in the circumferential direction, and the outer flange 32 and the inner flange 33 of the cover tubular wall 31 are provided on the upper end of the cover 30 so as to project radially outward. Since the magnet is reliably positioned in the axial direction by the magnet axial positioning portion 38 formed on the side, fixing with an adhesive can be omitted.

(5) By the above (4), since the winding crimping margin and the pressing ring at the opening end side of the yoke 11 can be eliminated, the variation in the axial height of the magnet is absorbed on the lower surface side of the magnet. Therefore, it is possible to eliminate the variation in the axial height of the magnet on the yoke opening side, and as a result, it is possible to reduce the axial length of the rotor of the magnet generator.

(6) Because of the above (5), the positions of the stator core and the magnet can be kept constant on the open end side of the rotor of the magneto generator, so that variations in the output of the magneto generator can be suppressed. it can.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, when it is difficult to form an elliptical hole for inserting a jig for setting a magnet in the closing wall near the yoke cylinder wall due to the construction of the magnet generator, the magnet case is used. Then, the same magnet fixing can be performed.

[0063]

As described above, according to the present invention,
Since the amount of protrusion of the axial positioning portion that is bulged on the cylindrical wall of the cover is mechanically determined by the axial stroke, even if the amount of protrusion is a large optimum value, it can be set easily and with high accuracy as desired. As well as
The set overhang amount can be stably reproduced.

Moreover, since the axial positioning portion is bulged in the horizontal direction, the amount of overhang can be set to a large optimum value, and the fixing force of the axial positioning portion with respect to the magnet should be increased. And the adhesion can be abolished.

With the outer flange portion of the cover in contact with the upper surface of each magnet, the yoke closing wall side portion of the cylindrical wall of the cover is bulged outward in the radial direction so that each magnet is outside the cover. Since it can be fixed in a state of being sandwiched by the collar portion and the axial positioning portion that is bulged and formed on the yoke closing wall side portion of the cover cylinder wall, the pressing ring winding and crimping portion can be eliminated, and the magnet power generation The axial length of the machine can be shortened. In addition, the height positions of the magnets are aligned on the outer flange of the cover, and the dimensional variations in the height direction of the magnets are absorbed on the blocking wall side of the yoke, and there is variation on the open end side. Since it does not appear, the axial length of the magneto generator can be further shortened.

[Brief description of drawings]

1A and 1B show a method of manufacturing a magneto-generator according to an embodiment of the present invention, in which FIG. 1A is a partially cutaway exploded perspective view showing a cover inserting step, and FIG. 1B shows a cover fixing step. Partially cut perspective view, (c) is a partially cut perspective view showing the cover bulging step.

FIG. 2 shows a yoke, (a) is a partially omitted plan view, (b) is a front sectional view taken along line bb of (a),
(C) is a partially omitted bottom view.

FIG. 3 shows a cover, (a) is a partially omitted plan view, (b) is a front sectional view, and (c) is a partially omitted bottom view.

FIG. 4 shows a rotor of a magnet generator manufactured by a method of manufacturing a magnet generator according to an embodiment of the present invention,
(A) is a plan view and (b) is a front sectional view taken along line bb of (a).

FIG. 5 is an enlarged partial front sectional view showing a magnet positioning step.

FIG. 6 is an enlarged partial front sectional view showing a cover press-fitting step.

FIG. 7 is a front sectional view showing a fixing step of the cover.

FIG. 8 is a front sectional view showing a step of forming a magnet axial direction positioning portion of the cover.

[Explanation of symbols]

11 ... Yoke, 12 ... Cylindrical wall, 13 ... Reactor, 14 ... Closure wall, 15 ... Shaft hole, 16 ... Circular hole, 17 ... Elliptical hole, 18
... convex portion, 19 ... female screw hole, 20 ... magnet, 21 ... arc-shaped inner peripheral surface (abdominal surface), 22 ... outer peripheral surface (rear surface), 23
... inclined surface portion, 24 ... rising side surface, 25 ... upper surface, 26
... Lower surface, 30 ... Cover, 31 ... Cylinder wall, 32 ... Outer collar part,
33 ... Inner collar part, 34 ... Fixing hole, 35 ... Notch part, 36 ...
Stiffness imparting part, 37 ... Circumferential positioning part, 38 ... Axial positioning part, 40 ... Rotor of magnet generator and manufacturing apparatus of its manufacturing method, 41 ... Base, 42 ... Yoke positioning jig, 43 ... Magnet circumferential direction Positioning jig (first jig for magnet), 43a ... Shoulder portion, 44 ... Magnet axial positioning jig (second jig for magnet), 45 ... Spring, 50 ... Fitting tool, 51 ... Small diameter portion, 52 ... Large diameter part, 5
3 ... Yoke positioning hole, 54 ... Insertion hole, 55 ... Annular groove,
60 ... Plastic device, 61 ... Main body, 62 ... Overhanging tool, 63
... driven side inclined surface portion (stroke conversion means), 64 ... compression spring, 65 ... guide hole, 66 ... operating tool, 67 ... small diameter portion, 68 ... large diameter portion, 69 ... guide concave portion, 70 ... driving side inclined surface (stroke Conversion means).

Claims (1)

[Claims] 1. A method of manufacturing a rotor of a magneto-generator, wherein a plurality of magnets are arranged at intervals on the inner circumference of a substantially bowl-shaped yoke, and a cylindrical cover is fitted inside the magnet. In the step of placing a plurality of magnets in the yoke and temporarily positioning the magnets, and pressing the cover inside the magnet group, and inward inward in the yoke closing wall side end of the cylindrical wall of the cover. A step of fixing the protruding inner flange portion to the closing wall of the yoke; and an overhanging member opposed to a portion of the space between the yoke closing wall of the cover and the yoke closing wall side end surface of the magnet, This overhang is moved radially outward by a stroke conversion means for mechanically converting an axial stroke into a radial stroke, so that the cylindrical wall of the cover is moved. And a step of forming an axial positioning portion on the side of the yoke closing wall side end of each magnet by radially outwardly projecting the facing portion of the overhanging tool on the yoke closing wall side. Method for manufacturing a rotor of a magnet generator.