JPH0789723B2 - Magnet generator rotor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotor for a magnet generator, and for example, for use in a rotor for a magnet generator mounted on a small or special vehicle such as a motorcycle or a buggy. Regarding valid ones.

[Conventional technology]

Conventionally, as a rotor used in a magnet generator, a plurality of magnets are arranged at intervals on the inner circumference of a substantially bowl-shaped yoke, and a thin plate having elasticity is used on the inner circumference of the magnet. Some of them have a cover formed in a shape attached thereto (see, for example, JP-A-52-156313).

In such a rotor of the magneto generator, the magnet is covered and protected by the cover and is fixed by being pressed onto the yoke.

[Problems to be solved by the invention]

However, in such a rotor of the magneto-generator, since the magnet is merely pressed against the inner peripheral surface of the yoke due to the spring property of the cover, there is a problem that the fixing force of the cover with respect to the magnet is insufficient. .

An object of the present invention is to solve the above problems and provide a rotor of a magnet generator capable of reliably fixing a magnet.

[Means for solving problems]

The rotor of the magneto-generator according to the present invention is formed into a bowl shape and is fitted into the yoke (11) and the yoke (11) in which the upper portion of the rotor has a crimping allowance portion (19). A plurality of partition walls (35) are provided on the upper surface of the ring (33) formed in a circular ring shape and are arranged at intervals in the circumferential direction so as to project at right angles, and adjacent partition walls (35), A magnet accommodating chamber (31) is formed in each of the spaces (35), and the recesses (3) fitted to each other are fitted in the yoke (11).
The case (13), which is prevented from rotating by the yoke (11) by the convex portion (6) and the convex portion (18), and the thickness (T) in the radial direction, which are respectively inserted into the magnet housing chambers (31). A plurality of magnets (12) formed to be thicker than the thickness (t) of the partition wall (35), and integrally formed in a thin-walled cylindrical shape by a plastically deformable metal material to form the case (13) and the magnets. The magnets (12) are press-fitted to the inner peripheral side of the group (12), and the cylindrical portion (37) is partly brought into close contact with the inner periphery of each magnet (12) and partly adjacent magnets (12), (12). Between the partition wall (35) and the wall of the partition wall (35) on the inner peripheral surface side of the magnet (12). A section S-shaped section (43) facing the case (13) is formed at the tip. A bar (14), and a pressing ring (15) abutting on the upper collar (39) of the cover (14) abutting on the upper end surfaces of the case (13) and the magnet (12) group. And the crimping margin (19) of the yoke (11) is crimped radially inward and pressed onto the pressing ring (15), and the tip of the cover (14) is provided. The S-shaped section (43) has a bent portion (38) which is bent outward in the direction parallel to the cylinder center at the inner peripheral side end.
b), and a flange portion (38a) formed by bending the tip end portion of the cylindrical portion (37) inward in the radial direction is expanded outward in the radial direction, and is formed.

[Action]

According to the above-mentioned means, the thickness T of the magnet 12 is determined by the partition wall portion.
Since it is formed thicker than the thickness t of 35, the magnet
By press-fitting a thin cylindrical cover 14 made of a metal material that plastically deforms inside the 12 groups,
A part of the cylindrical portion 37 of 14 is brought into close contact with the inner circumference of each magnet 12, and the other portion is formed on the inner peripheral surface side of the partition wall portion 35 between the adjacent magnets 12, 12. It can be swollen into the thickness difference space.

A part of the cylindrical portion 37 of the cover 14 is closely attached to the inner circumference of each magnet 12, and the other part is adjacent to the magnets 12, 12.
Since it is bulged and deformed in the wall thickness difference space on the inner peripheral surface side of the partition wall portion 35, the magnet 12 can be covered by the cover 14, and the magnet 12 is pressed against the yoke 11 and fixed. Can be strengthened.

A cover 14 having a brim 38a formed at the tip and a bent portion 38b formed at the inner end is press-fitted into the magnet 12, and the tip is expanded radially outward to cover the magnet 12. Since the S-shaped section 43 in cross section can be formed at the tip of the cover 14,
The rigidity of 14 can be increased, and the tip of the cover 14 can be prevented from protruding radially inward. Since the cover 14 can be made thinner by increasing the rigidity of the cover 14, the electrical characteristics of the magneto-generator can be improved by increasing the diameter of the electrons generated. In addition, by preventing the tip of the cover from overhanging, it is possible to avoid interference with the bolts that are inserted through the mounting holes, and, in addition to the fact that the cutting edge faces outward, the tip of the cover during assembly work It is possible to prevent accidents such as obstacles caused by parts and improve the handleability.

〔Example〕

FIG. 1 is an exploded perspective view showing a rotor of a magneto-generator which is an embodiment of the present invention, FIG. 2 is a vertical sectional view showing its assembled state, and FIG. 3 is a vertical sectional view showing its assembly process. FIG. 4 is a partially cutaway plan view, FIG. 5 is also a longitudinal sectional view, FIG. 6 is a partial transverse sectional view for explaining the operation, and FIGS. 7 and 8 are enlarged partial sectional views. Is.

In this embodiment, the rotor as a magnet unit includes a yoke 11, a plurality of magnets 12, a case 13, a cover 14, and a holding ring 15.

The yoke 11 is integrally formed in a substantially bowl shape with an upper surface opened and a lower surface closed by a magnetic material, and a shaft hole 16 for inserting a boss (not shown) directly connected to the engine is formed in the lower surface closing wall. In addition, a plurality of mounting holes 17 for connecting the rotor to the boss are provided at positions outside the shaft hole 16, respectively. A plurality of convex portions 18 for preventing the case 13 from rotating are provided at the outer position of the mounting hole 17 by protruding the lower surface blocking wall from the outer surface.
And the convex portion 18 are arranged in the circumferential direction at an arbitrary angle. On the upper end of the yoke 11, a crimping margin portion 19 is formed by cutting the outer periphery.

The magnet 12 has a height H that is less than or equal to the depth of the yoke 11, and is integrally formed into a substantially rectangular parallelepiped having an arc shape curved along the inner circumference of the yoke 11 in the width W direction. At both ends of the arc-shaped inward surface (hereinafter referred to as the abdominal surface) 20 of the magnet 12, the inclined portions 22 are formed so as to approach the arc-shaped outward surface (hereinafter referred to as the rear surface) 21 as going outward. Has been done. Rising sides 23 and 23 on both sides, top
The lower surface 24 and the lower surface 25 are formed parallel to each other.

The case 13 is integrally formed by die casting or the like using a non-magnetic metal material such as aluminum, and is formed into a substantially cylindrical shape that fits in the yoke 11 as a whole. A plurality of storage chambers 31 are formed in the cylindrical wall 30 of the case 13 so as to be arranged in the circumferential direction with substantially the same phase difference. The accommodating chamber 31 is formed in a hollow chamber having a height h equal to or lower than the height H of the magnet 12 and a width w slightly larger than the width W of the magnet 12, and the center of the ceiling wall, back wall and abdominal wall thereof. The departments are open to each other. Therefore, the case
Reference numeral 13 is formed in a shape in which a plurality of frames whose upper parts are open are connected in an annular shape.

The floor wall portion 32 of each accommodation chamber 31, that is, the lateral piece of each upper opening frame is adjacent to each other to form a series of rings 33, the inner edge of the floor surface wall portion 32 in each accommodation chamber 31 The protrusion 34 is formed in an arc shape.

Each partition wall 35 corresponding to each vertical piece of the upper open frame is formed so as to stand up in a column shape between the adjacent storage chambers 31, 31, and the wall thickness t of each partition wall 35 is a magnet. 12
Is formed to be slightly thinner than the wall thickness T of. On the lower surface of the ring 33, a plurality of recesses 36 are arranged so as to be located directly below the partition wall 35 between the storage chambers 31, 31, and are recessed.
Is formed so as to fit into the convex portion 18 of the yoke 11.

The cover 14 is integrally formed by drawing press processing using a magnetic metal material that plastically deforms such as a thin iron plate,
It is formed into a substantially cylindrical shape that fits inside the case 13 as a whole. Before assembly, the lower flange 38a is bent inward in the radial direction to form a circular annular band at the lower end of the cylindrical portion 37 of the cover 14, and at the inner peripheral end of the flange 38a. The bent portion 38b is bent downward in the direction parallel to the cylinder center, and is formed in a short cylindrical shape in series with the lower collar portion. On the other hand, on the upper end of the cylindrical portion 37 of the cover 14, an upper flange portion 39 is formed in a circular annular band shape protruding radially outward.

The pressing ring 15 is integrally formed by punching and pressing using a non-magnetic metal material, and is formed in a substantially annular shape having a notch 41 in a part thereof.

Next, the structure of the rotor of the magneto-generator according to the present invention will be described by explaining the assembling work of the rotor of the magneto-generator by the respective components according to the above-described structure.

First, the case 13 is fitted into the yoke 11, and the respective concave portions 36 on the lower surface of the case 13 are fitted into the respective convex portions 18 raised on the bottom wall of the yoke 11. By fitting the convex portion 18 and the concave portion 36, the case 13 is prevented from rotating so as to rotate integrally with the yoke 11.

Subsequently, the magnet 12 is inserted into each of the housing chambers 31 of the case 13 from above. At this time, since the width w of the storage chamber 31 is formed to be slightly larger than the width W of the magnet 12, each magnet 12 can be easily inserted into each storage chamber 31.

After the magnets 12 are inserted into all the accommodation chambers 31 until they are pressed against the protrusions 34 of the floor surface wall portion 32, the magnets 12 shown in FIGS.
As shown in the drawing, a concave plastic deformation portion 42 is stamped on the upper end portion of each partition wall portion 35 at the same time or specially by using a pressing die (not shown) such as a wedge-shaped punch. .

With the depression formation of the concave plastic deformation portion 42, the wall at the upper end of the partition wall portion 35 expands and plastically deforms outward in the circumferential direction, so that the partition wall portions 35 and 35 on both sides of the magnet 12 are accommodated in the accommodation chamber 31. By pressing the inserted magnet 12 from both sides, it is firmly fixed.

After that, inside the magnet 12 group that is housed and fixed in each housing chamber 31 of the case 13 and aligned in a ring shape, it is formed into a cylindrical shape having an outer diameter larger than the diameter of the circular inner peripheral surface formed by the magnet 12 group. The cover 14 is press-fitted using a press-fitting device 50 as shown in FIG.
The tip portion thereof can be pushed and spread toward the yoke 11 side.

Here, the configuration of the press-fitting device shown in FIG. 5, and the press-fitting operation of the cover and the spreading operation of the tip end portion using the press-fitting device will be described in detail.

The press-fitting device 50 includes a main body 52 that is moved up and down by a piston rod 51 of a cylinder device (not shown) and a guide cylinder 53 that is externally mounted on the main body. An upper pressing member 54 is fixed to the lower end of the main body 51, and the upper pressing member 54 is a cover.
It is formed in a ring shape with an inverted L-shaped cross section so that it can be fitted into the upper part of 14 and press the upper collar part 39. Also, the main body 52
A plurality of levers 55 are arranged at substantially equal intervals in the circumferential direction, and the lever 55 is rotatably supported by a pin 56 at a substantially central portion so as to rotate in the radial direction. A lower pressing member 57 is integrally projectingly provided at the lower end of the lever 55, and the lower pressing member 57 is fitted into the lower portion of the cover 14 and is fitted to the lower flange 38a.
Is formed in an arc shape that is in contact with. A cam hollow 58 is provided on the upper end portion of the lever 55 so as to project in the radial direction. The hollow 57 is formed on the inner peripheral surface of the guide cylinder 53 as the main body 52 descends relative to the guide cylinder 53. Being cam 59
Is configured to slide.

When the cover is press-fitted to the inner peripheral surface of the magnet by this press-fitting device, as shown in FIG. 5, in the cover 14, the lower flange portion 38a is on the lower pressing member 57 and the upper flange portion 39 is on the upper side. The pressing members 54 are set so as to be in contact with each other. cover
When 14 is set, the main body 52 and the guide tube 53
The cover 14 is lowered relative to the upper and lower edges 11 and
And 38a are simultaneously pressed by the pressing members 54 and 57, the upper flange portion 39 is provided on the inner peripheral surface of the magnet 12 group housed and fixed on the inner peripheral surface of the yoke 11 and the upper surface 24 of the magnet 12.
It is press-fitted until it is pressed against.

At the time of this press-fitting, the cover 14 is formed into a cylindrical shape whose outer diameter is larger than the inner diameter of the magnet 12 group by using a thin plate which is plastically deformed, and the wall thickness t of the partition wall portion 35 of the case 13 is the wall thickness of the magnet 12. Since it is formed slightly thinner than the thickness T,
As shown in FIG. 6, the cover 14 is plastically deformed into a corrugated cross-sectional shape, so that it is strongly adhered to the inner peripheral surface of the partition wall 31 of the magnet 12 and the case 13.

That is, with press fitting, the diameter of the portion of the cover 14 facing the magnets 12 is reduced, and the diameter of the portions of the cover 13 facing the partition walls 35 of the case 13 is increased so as to absorb the reduced pressure. Is forced to be plastically deformed.

Further, in this press-fitting plastic deformation action, even if the cover 14 is plastically deformed, the collar portions 3 are formed on the upper and lower ends of the cover 14.
Since each of 9 and 38a is formed, the cylindrical portion 37 has sufficient rigidity against a radial force. Further, since the pressing force is applied to the upper and lower collar portions 38a and 39 by the upper and lower pressing members 54 and 57, respectively, the buckling force applied to the cylindrical portion 37 is appropriately suppressed. Therefore,
The cover 14 press-fits smoothly into the case 11, and
The outer peripheral surface of the cylindrical portion 37 of 14 uniformly and strongly adheres to the inner peripheral surface of the magnet 12 and the partition wall portion 35 of the case.

When the upper flange portion 39 of the cover 14 is pressed against the upper surface of the magnet 12, the guide cylinder 53 is raised relative to the main body 52.
As a result, the cam hollow 58 relatively slides on the cam 59, so that the lever 55 is rotated in the radial direction. As the lever rotates, the lower pressing member 57 spreads radially outward, so that the tip of the cover 14 is spread.

Since the lower brim portion 38a and the bent portion 38b are formed in series on the inner end portion of the lower brim portion 38a at the tip end portion of the cover 14 to be spread out, the cross-sectional shape of the tip end portion of the cover 14 after being spread out is As shown in FIG. 7, both the portion adjacent to the lower end of the magnet 12 and the cut end are the yoke 11
It becomes a substantially S shape that faces the side. That is, the tip of the cover 14 is bent 90 degrees or more from the vicinity of the root of the lower brim 38a, and that portion follows the lower end of the magnet 12.

The reason why the S-shaped portion 43 having a meandering cross-section is formed at the tip portion of the cover 14 after being expanded is that the lower collar portion is formed.
Since a substantially Z-shaped steel shape is formed from the bending portion 38a to the bending portion 38b so that the bending rigidity is large, even if the pushing and spreading force is applied, the bending is warped so as to retain the shape and elastically warp. Since the vicinity of the root of the portion 38a is easily plastically deformed, it is considered that the portion 38a is plastically bent by the urging force of the spreading.

By the way, when the lower brim portion which does not have the bent portion 38b at the inner peripheral side end portion is pushed outward in the radial direction while being pushed down, as shown in FIG. 8, the lower end portion of the cover 14 has a circular arc cross section. The shape is changed, and a gap 44 is formed between the lower end of the abdominal surface 20 of the magnet 12 and the lower end of the cover 14. It is considered that this is because the lower end portion of the cover having the lower brim portion is increased in bending rigidity and is pulled inward in the radial direction during the spreading process.

Thus, when the gap 44 is formed between the magnet and the cover, the cover is incompletely attached to the magnet, the fixing force is reduced, and the cut edge of the cover easily injures a finger or the like. Danger occurs.

After that, the pressing ring 15 is applied on the upper flange portion 39 of the cover 14 that covers the upper end surface of the case 11, and the winding crimping process is performed by pushing it inwardly on the winding crimping margin portion 19 at the upper end portion of the yoke 11. Is given. As a result, the yoke 11, the magnet 12, the case 13, the cover 14, and the pressing ring 15 are caulked and integrated.

In this way, the rotor of the magneto generator shown in FIG. 2 is manufactured.

That is, in this rotor, each magnet 12 is housed in each housing chamber 31 of the case 13 fitted in the yoke 11 and is pinched and fixed between the partition walls 35, 35, and the belly surface 20 thereof is covered by the cover 14. It is plastically deformed and strongly adhered, and the magnet 12 is attached to the tip of the cover 14.
An S-shaped section 43 having a cross section facing the yoke side is formed at both the portion adjacent to and the cutting edge.

According to the present embodiment, by pressing the cover formed of the plastically deformable thin plate into the inner circumference of the magnet group, the cover can be plastically deformed along the inner surface shape of the magnet. The magnet can be strongly adhered to the magnet, and the cover can press the magnet against the yoke to strengthen the fixation.

The end of the cover that covers the magnet is formed by pressing the cover, which has a flange at the tip and a bent portion at the inner end thereof, into the magnet and pushes the tip outward in the radial direction. Since the S-shaped section can be formed in the section, the rigidity of the cover can be increased and the tip of the cover can be prevented from protruding radially inward.

Since the cover can be made thinner by increasing the rigidity of the cover, the electrical characteristics of the magneto-generator can be improved by increasing the diameter of the generated electrons. In addition, by preventing the tip of the cover from overhanging, it is possible to avoid interference with the bolts that are inserted through the mounting holes, and, in addition to the fact that the cutting edge faces outward, the tip of the cover during assembly work It is possible to prevent injury accidents due to parts and improve the handleability.

By using the press-fitting device according to the above configuration, it is possible to continuously perform press-fitting work on the inner circumference of the magnet group of the cover and spreading work of the cover tip portion,
It is possible to suppress a decrease in productivity.

A magnet is inserted into each of the storage chambers formed in the case, and a concave plastic deformation part is stamped on the partition wall of the case to hold the magnet from both sides, so the number of parts and the number of assembly steps are reduced. Can be reduced,
The work of screwing or riveting can be eliminated and the workability can be improved, and since each magnet is independent, there is no wasteful part such as the neutral part, which is economically advantageous.

In addition, the case is inserted into the yoke, the magnet is inserted into the housing chamber of the case, the cover is press-fitted onto the inner peripheral surface of the magnet group, the cover tip is pushed open, and the pressing ring is set in a unidirectional manner. Since it is an attached work, it is extremely workable and can be fully automated easily.

In the state of being fixed with the yoke, the magnet is completely surrounded by the case and the cover, so even if the magnet should be damaged, the fragments will not scatter, and the fragments due to the rotation of the rotor will scatter. It is possible to prevent the occurrence of secondary failure.

Since the magnet is pinched and fixed in the housing chamber of the case and is closely covered by the cover, the magnet does not fluctuate (rattle) due to the inertial force applied by the angular acceleration in the use state, and each part is prevented from moving due to the motion. It is possible to suppress wear, deterioration, breakage and the like.

By the way, in an air-cooled engine, etc. where the vehicle speed does not increase even at high revolutions such as a buggy car, the generator room and oil temperature rise very much, and a severe heat shock is applied to the rotor of the magnet generator. If a resin or an adhesive is used for fixing to the yoke, the resin may be melted or the adhesive strength may be lowered. In such a case, when inertial force is applied to the rotor, there is a fear that the magnet may move in the yoke and the function of the magnet generator may be deteriorated.

However, in this embodiment, since the magnet is housed and fixed in the housing chamber of the case made of a non-magnetic metal material, and is covered by the cover made of a magnetic metal material, the melting or fixing force There is no danger of a decrease in Therefore, it is possible to avoid an unexpected situation such as the functional deterioration of the magnet generator due to the movement of the magnet caused by the melting or the decrease in the fixing force, and the scattering of the magnet.

The present invention is not limited to the above embodiment,
It goes without saying that various modifications can be made without departing from the spirit of the invention.

The press-fitting work of the cover and the spreading work of its tip are
Not only the press-fitting device in the above-described embodiment is used for continuous execution, but after the press-fitting work, another device may be used to perform the spreading operation.

The case is not limited to being formed by aluminum die casting, but may be formed by forging using an aluminum or other non-magnetic metal material, combustion molding, or the like.

In addition, in the case where the heat resistance requirement is relaxed, the case may be made of synthetic resin. In this case, ultrasonic caulking or high frequency heating may be used as the plastic deformation means.

An adhesive may be used supplementarily for fixing the case and the magnet, the cover and the magnet, and the case.
In this case, since the meandering portion of the tip of the cover acts as a flow stop for the adhesive, it is possible to prevent adverse effects such as contamination due to the adhesive flowing out into the yoke.

The anti-rotation structure between the yoke and the case is not limited to the structure in which the convex portion raised on the yoke and the concave portion recessed in the case are fitted together, and the anti-rotation hole formed in the yoke is projected into the case. A structure or the like formed by fitting the provided protrusions may be used.

〔The invention's effect〕

As described above, according to the present invention, since the thickness T of the magnet 12 is formed to be thicker than the thickness t of the partition wall portion 35, the thin-walled cylindrical shape is formed inside the magnet 12 group by the plastic material that is plastically deformed. By press-fitting the cover 14 formed in the
The inner periphery of 12 can be brought into close contact, and the other part can be bulged into the wall thickness difference space formed on the inner peripheral surface side of the partition wall portion 35 between the adjacent magnets 12, 12.

A part of the cylindrical portion 37 of the cover 14 is closely attached to the inner circumference of each magnet 12, and the other part is adjacent to the magnets 12, 12.
Since it is bulged and deformed in the wall thickness difference space on the inner peripheral surface side of the partition wall portion 35, the magnet 12 can be covered by the cover 14, and the magnet 12 is pressed against the yoke 11 and fixed. Can be strengthened.

A cover 14 having a brim 38a formed at the tip and a bent portion 38b formed at the inner end is press-fitted into the magnet 12, and the tip is expanded radially outward to cover the magnet 12. Since the S-shaped section 43 in cross section can be formed at the tip of the cover 14,
The rigidity of 14 can be increased, and the tip of the cover 14 can be prevented from protruding radially inward. Since the cover 14 can be made thinner by increasing the rigidity of the cover 14, the electrical characteristics of the magneto-generator can be improved by increasing the diameter of the electrons generated. In addition, by preventing the tip of the cover from overhanging, it is possible to avoid interference with the bolts that are inserted through the mounting holes, and, in addition to the fact that the cutting edge faces outward, the tip of the cover during assembly work It is possible to prevent accidents such as obstacles caused by parts and improve the handleability.

[Brief description of drawings]

1 (a), (b), (c), (d), and (e) are exploded perspective views showing a rotor of a magnet generator according to an embodiment of the present invention, and FIG. 2 is its assembled state. FIG. 3 is a vertical cross-sectional view showing an assembling process thereof, FIG. 4 is a partially cut-away plan view of the same, FIG. 5 is a vertical cross-sectional view of the same, and FIG. Partial transverse sectional views, FIG. 7 and FIG. 8 are enlarged partial sectional views of the same. 11 …… Yoke, 12 …… Magnet, 13 …… Case, 14…
… Cover, 15 …… Pressing ring, 16 …… Shaft hole, 17 …… Mounting hole, 18 …… Convex part, 19 …… Crimping allowance part, 30 …… Cylinder wall, 31 …… Accommodation chamber, 35 …… Partition wall, 36 ... Recess, 37 ...
Cylindrical part, 38a …… Lower collar part, 38b …… Bending part, 39 ……
Upper collar part, 41 ... Notch part, 42 ... Concave plastic deformation part, 43 ...
… S-shaped part (meandering part), 44 …… gap, 50 …… press fitting device, 51 …… piston rod, 52 …… main body, 53 …… guide cylinder, 54 …… upper pressing member, 55 …… lever , 56 …… Pin, 57 …… Lower pressing member, 58 …… Cam hollow, 59 …… Cam.

Claims (1)

[Claims] 1. A yoke (11), which is formed in a bowl shape and has a crimping margin (19) formed on the upper end thereof, and a yoke (11) fitted into the yoke (11) to form a circular ring shape. A plurality of partition walls (35) are arranged on the upper surface of the ring (33) at intervals in the circumferential direction so as to project at right angles, and between the adjacent partition walls (35) and (35). A magnet accommodating chamber (31) is formed, and in the state of being fitted in the yoke (11), the recesses (3
The case (13), which is prevented from rotating by the yoke (11) by the convex portion (6) and the convex portion (18), and the thickness (T) in the radial direction, which are respectively inserted into the magnet housing chambers (31). A plurality of magnets (12) formed to be thicker than the thickness (t) of the partition wall (35), and integrally formed in a thin-walled cylindrical shape by a plastically deformable metal material to form the case (13) and the magnets. The cylindrical portion (37) is press-fitted to the inner peripheral side of the group (12), and a part of the cylindrical portion (37) is in close contact with the inner periphery of each magnet (12), and a part thereof is adjacent to the magnets (12), (12). Between the partition wall (35) and the wall of the partition wall (35) on the inner peripheral surface side of the magnet (12). A section S-shaped section (43) facing the case (13) is formed at the tip. A bar (14), and a pressing ring (15) abutting on the upper collar (39) of the cover (14) abutting on the upper end surfaces of the case (13) and the magnet (12) group. And the crimping margin (19) of the yoke (11) is crimped radially inward and pressed onto the pressing ring (15), and the tip of the cover (14) is provided. The S-shaped section (43) has a bent portion (38) which is bent outward in the direction parallel to the cylinder center at the inner peripheral side end.
a magnet having a b) and a flange portion (38a) formed by bending the tip of the cylindrical portion (37) inward in the radial direction and expanding the flange portion outward in the radial direction. Generator rotor.