JPH0746781A - Rotor of permanent-magnet generator - Google Patents

Abstract

PURPOSE:To fix magnets over a whole axial length and fix a cover to the bottom of a yoke properly. CONSTITUTION:Swollen parts 47 which are formed by swelling the parts of a cylindrical cover wall 41 radially outward are formed over a whole axial length in the spaces between magnets 20 and 20. An outside flange part 42 which protrudes radially outward on the yoke opening side of the cover is pressed against the end planes of the yoke opening sides of the respective magnets. An elasticity applying part 43 is formed on the outside flange part 42 so as to actuate the magnets 20 in the direction of a yoke blocking wall. An inside flange part 44 protruding radially inward from the yoke blocking wall side of the cover 40 is fixed to the yoke blocking wall. A rigidity applying part 46 is formed on the inner circumference of the inside flange part annularly and into a form bending toward an axial opening side. With this constitution, the rigidity applying part prevents the inside flange part from waving which may be produced against a stress when the cover is pushed into the position, so that the inside flange can be fixed to the yoke blocking wall properly.

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 magnet generator, as described in JP-A-61-280747, a plurality of arc-shaped rotors arranged on the inner peripheral surface of an iron bowl are used. The cylindrical portion of the magnet protection member is pressed against the inner peripheral surface of the magnet, and the flange portion of the magnet protection member is brought into contact with the end surface of each magnet on the opening end side to restrict the axial movement of each magnet, and at the same time, the magnet protection member. Fixing the fixed part to the bottom of the iron bowl, and making the outer shape of the iron bowl bottom side of the cylinder part of the magnet protection member into a taper shape smaller than the inner diameter dimension of each magnet array, and the cylinder part of the magnet protection member. By forming a bulge portion that bulges outward in the radial direction toward the space between the magnets, each magnet is fixed to the iron bowl inner peripheral surface by fixing the magnet protection member to the iron bowl. There are some Further, the bulging portion absorbs the deformation of the magnet protection member during press fitting of the magnet protection member,
The outer shape of the cylindrical portion of the magnet protection member on the fixed portion side is tapered so as to be smaller than the inner diameter of each magnet array, so that the deformation of the magnet protection member on the fixed portion side is reduced and the magnet protection member is reduced. It is configured so that the fixing part can be securely fixed to the iron bowl.

[0005]

However, in the rotor of such a magnet generator, the outer shape of the cylindrical portion of the magnet protection member on the bottom side of the iron bowl is smaller than the inner diameter of each magnet array. Since the bulging portion cannot be formed over the entire axial length of the magnet, the magnet cannot be fixed with a uniform force over the entire axial length, and the internal space on the iron bowl bottom side becomes narrower. There is a problem.

An object of the present invention is to provide a rotor for a magnet generator capable of firmly fixing the magnet to the inner circumference of the yoke and properly fixing the cover to the bottom of the yoke.

[0007]

In the rotor of a magneto-generator according to the present invention, a plurality of magnets are arranged at circumferentially spaced intervals on the inner circumference of a substantially bowl-shaped yoke. In a rotor of a magneto generator in which a tubular cover is press-fitted and fixed to a rotor, a bulge formed by radially bulging a tubular wall of the cover is an axis of a space between adjacent magnets. Is formed over the entire length in the direction, and the outer flange portion that projects radially outward on the yoke opening side of the cover is in contact with the yoke opening side end surface of each magnet,
Further, an inner flange portion, which is provided radially inward on the yoke closing wall side of the cover, is fixed to the yoke closing wall, and a rigidity imparting portion is formed in an annular shape on the inner flange portion. It is characterized by

[0008]

According to the above-mentioned means, since the rigidity imparting portion is formed on the inner peripheral portion of the inner flange portion of the cover, when the cover is press-fitted inside the magnet, the inner flange portion is wavy. Even if the stress to deform is applied, the rigidity imparting portion sufficiently resists this stress, so that the inner collar portion is prevented from being deformed in an undulating state. Therefore, the inner collar portion of the cover can be properly fixed to the yoke blocking wall.

Further, since the bulging portion formed by the cylindrical wall of the cover bulging outward in the radial direction is formed over the entire axial length of the space between the adjacent magnets, the magnets can be reliably positioned and fixed. it can.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a rotor of a magneto-generator which is an embodiment of the present invention, (a) is a partially cut plan view, (b).
FIG. 4A is a front sectional view taken along line bb in (a). FIG. 2 is an exploded perspective view thereof.

In the present embodiment, the rotor of the magneto-generator according to the present invention comprises a yoke, a plurality of magnets, a case 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 cylindrical wall 12 having a predetermined width in the circumferential direction and the axial direction. It is projected outward. A shaft hole 15 for inserting a boss (not shown) directly connected to the engine is opened in the lower surface blocking wall 14 of the yoke 11 at the center. A plurality of case fixing projections 16 (four in this embodiment) for fixing the case so as to prevent rotation of the case are provided outside the shaft hole 15, and the closing wall is concentric with the shaft hole 15. A part of 14 is projected by being pushed up from the lower surface side.

A plurality of cover fixing projections 17 (8 in this embodiment) for fixing the cover are provided on the bottom surface of the closing wall 14 of the yoke 11, and a case fixing projection 16 is provided.
At a position closer to the inner side than the group, they are arranged at equal intervals in the circumferential direction on a concentric circle with the shaft hole 15, and a part of the closing wall 14 is pushed up from the outer surface so as to project inward in the axial direction. The convex portion 18 is configured so that it can be caulked by being inserted into a fixing hole provided in the cover so as to be described later.

In this embodiment, no winding and caulking 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 formed into a substantially rectangular parallelepiped having an 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 an abdomen surface) 21 of the magnet 20 so as to approach the outer peripheral surface 22 toward the left and right end portions. 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 case 30 is integrally molded using a non-magnetic material such as resin having an appropriate elasticity, and is formed into a substantially circular bowl shape which is fitted into the yoke 11 as a whole. . The case 30 includes a ring 31 having a circular ring shape having an inner diameter substantially equal to the inner diameter of the yoke 11. The radial thickness of the ring 31 is slightly smaller than the radial thickness of the magnet 20. On one end surface (hereinafter, referred to as an upper surface) of the ring 31, the same number of partition walls 32 as the magnets 20 (four in this embodiment) are arranged at equal intervals in the circumferential direction and on one side in the axial direction. They are projected in parallel with each other.

The height of each partition wall 32 is the same as that of the magnet 20.
The height of the magnet 20 in the radial direction is slightly smaller than the thickness of the magnet 20 in the radial direction. The magnet accommodating chamber 3 is provided between the adjacent partition walls 32.
3 are formed substantially. The magnet accommodating chamber 33 has an arc-shaped hollow having a height equal to or less than the height of the magnet 20, a width slightly larger than the circumferential width of the magnet 20, and a width slightly smaller than the radial width of the magnet 20. Formed in the chamber. Further, the magnet housing chamber 33 is open at the ceiling surface, the back surface, and the abdominal surface.

Partition wall 3 in ring 31 of case 30
A plurality of fixing recesses 34 (four in this embodiment) for preventing the case itself from rotating around the yoke 11 are provided on the lower surface, which is the end surface on the side opposite to 2, at positions corresponding to the respective partition walls 32. They are arranged respectively and are buried at a certain depth and a certain width. The concave portion 34 is formed so as to fit into the fixing convex portion 16 provided on the yoke 11.

The cover 40 is made of a metal material such as a thin iron plate and is integrally formed by drawing and pressing. The cover 40 is formed into a substantially cylindrical shape which is press-fitted into a cylinder formed by a group of magnets 20 described later. That is, the cover 40 has a circular cylindrical wall 41, and the outer diameter of the cylindrical wall 41 is formed to be slightly larger than the inner diameter of the cylinder formed by the magnet 20 group.

An outer flange portion 42 is formed at one end (hereinafter, referred to as an upper end) of a cylindrical wall 41 of the cover 40 in a circular donut shape protruding radially outward. An elasticity imparting portion 43 is integrally fold-formed at a connection portion of the outer flange portion 42 with the cylindrical wall 41. That is, the elasticity imparting portion 43 is formed in a circular donut shape having a substantially semicircular cross section and a gutter shape with the opening side facing downward. Then, the elasticity imparting section 4
In the state where the outer peripheral portion of the outer collar portion 42 is pressed against the upper end surface of the magnet 20, the outer peripheral portion 3 is appropriately bent to bias the magnet 20 with an elastic force corresponding to the bending.

Before assembling, an inner flange portion 44 is integrally formed in a circular donut shape at the lower end of the cylindrical wall 41 of the cover 40. The inner diameter of the inner flange portion 44 is smaller than the arrangement diameter of the convex portion 17 group arranged on the yoke 11, and is set to be slightly larger than the inner diameters of the shaft holes 15 and 15.
Fixing holes 45 are provided in the radial middle portion of the inner flange portion 44 in the same number as the convex portions 17 group of the yoke 11 (8 in this embodiment), and each of them is aligned with the convex portion 17 group of the yoke 11. Each fixing hole 45 is provided in each convex portion 17
Are formed so that they can be inserted respectively.

Further, a rigidity imparting portion 46 is formed by bending over the entire circumference on the inner peripheral edge of the inner flange portion 44.
The rigidity-imparting portion 46 is formed by drawing the inner collar portion 44.
The inner peripheral edge portion is bent and formed inward in the axial direction at a constant height over the entire circumference, and is provided with sufficient rigidity when the cover 40 described later is press-fitted.

Next, the structure of the rotor of the magneto generator will be described by explaining the assembling work of the rotor of the magneto generator by the components having the above-mentioned structure.

First, the case 30 is fitted in the yoke 11, and each fixing projection 1 is raised on the bottom wall of the yoke 11.
The fixing recesses 34 on the lower surface of the case 30 are fitted in the case 6, respectively. By fitting the convex portion 16 and the concave portion 34, the case 30 is prevented from rotating so as to rotate integrally with the yoke 11.

Subsequently, the magnets 20 are inserted into the respective accommodation chambers 33 of the case 30 from above. When the magnet 20 is inserted into the accommodation chamber 33, the magnet 20
Side surfaces 24, 24 of the partition wall 3 are substantially parallel to the normal line, that is, the partition wall portion 3
Since it is formed substantially parallel to the side surface of the magnet 2,
0 will be accurately positioned in the circumferential direction. In this state, the magnets 20 that are alternately arranged in a ring shape
The partition wall 32 and the partition wall 32 are pressed against each other along the inner peripheral surface of the yoke 11.

Next, inside the group of magnets 20 housed in the respective housing chambers 33 of the case 30 and arranged in an annular shape, an outer diameter slightly larger than the diameter of the circular inner peripheral surface of the group of magnets 20 is formed. The cover 14 having a cylindrical shape is press-fitted. With this press fitting, the cover 40
The portions of the cylindrical wall 41 facing each other between the adjacent magnets 20, 20 are bulged into the respective spaces to form the bulged portions 47, respectively.

When the bulging portions 47 of the cylindrical wall 41 are bulged by press-fitting the cover 40 into the group of magnets 20, secondary stress due to bulging deformation is applied to the inner flange portion 44 of the cover 40. Is applied, the inner collar portion 44 tries to deform into a wavy state.

However, in the present embodiment, the inner collar portion 4
Since the rigidity-imparting portion 46 is formed by bending in the inner peripheral portion of 4, the rigidity-imparting portion 46 resists this stress even if a stress that deforms the inner flange portion 44 into a wavy state is applied. By doing so, it is possible to prevent the inner flange portion 44 from being deformed into a wavy state. Therefore, as will be described later, the fixing convex portion 17 is fitted into the fixing hole 45 and the fixing convex portion 17 is caulked, so that the inner flange portion 44 of the cover 40 is fixed to the closing wall 14 of the yoke 11. In doing so, the inner flange portion 44 is properly fixed without being adversely affected by the deformation.

When the cover 40 is press-fitted into the group of magnets 20, the cover 1 is attached to the outer flange 42 and the inner flange 44.
Since a jig for urging the pushing force or the reaction force opposite thereto can be engaged with the pressing member 4, the pressing force can be uniformly urged over the entire cover 14. By uniformly urging the pressure input, the cover 40
Axial folds (horizontal stripes) on the cylinder wall 41 as the
It is possible to prevent the occurrence of cracks and irregular deformation of the cylindrical wall 41, the outer flange portion 42, and the inner flange portion 44, and it is possible to realize more precise press fitting.

The outer flange 4 is provided on the upper edge of the cover 40.
2, since the inner flange portions 44 are formed on the lower end sides, respectively, even if the cover 40 is formed of a thin iron plate,
The cylinder wall 41 has sufficient rigidity. Therefore, the cover 40 can be smoothly press-fitted into the magnet 20 group, and adjacent to the cylinder wall 41 so that the outer peripheral surface of the cylinder wall 41 of the cover 40 uniformly and uniformly adheres to the inner peripheral surface of the magnet 20 group. The bulging portion 47 is appropriately formed over the entire length in the axial direction in each portion of the matching magnets 20, 20 facing the space.

When the cover 40 is press-fitted into the magnet group 20 up to the final stroke, the inner flange portion 44 comes into contact with the bottom surface of the closing wall 14 of the yoke 11. In this state, the respective fixing holes 45 formed in the inner collar portion 44 are connected to the yoke 1
The fixed convex portions 17 projectingly provided on the bottom surface of the first closing wall 14 are fitted to each other.

After the press-fitting tool is pulled out from the inside of the cover 40, or at the fixing hole 4 of the cover 40 of the press-fitting tool.
By inserting the caulking pin into the through hole provided in the portion that abuts on 5, the protruding end portion of the fixing projection 17 of the yoke 11 inserted into the fixing hole 45 of the cover 40 is caulked. Then, the cover 40 is formed on the entire circumference of the inner flange portion 44 of the yoke 11 by the convex portion 17 group after the caulking process.
It is in a state of being fixed in a circular ring shape to the closing wall 14 of.

Thus, in the state where the cover 40 is fixed to the yoke 11, the outer flange portion 42 formed on the upper end side of the cover 40 is pressed against the upper end surface of the magnet 20 group to move the magnet 20 downward in the axial direction. It will be pushed. When the outer collar portion 42 pushes the upper end surface of the magnet 20 downward in the axial direction, a reaction force acts on the outer collar portion 42 from the magnet 20 side, so that the elasticity imparting portion 43 formed on the outer collar portion 42.
Accumulates elastic force by elastically deforming upward. The elastic force of the elasticity imparting portion 43 causes the outer collar portion 42 to push the magnets 20 downward in the axial direction.

The magnet 20 group is pushed downward in the axial direction by the pressing force of the outer flange portion 43 of the cover 40, and the magnet 20 is pulled out from the space between the yoke 11, the cover 40 and the housing portion 33 of the case 30. Is reliably prevented, and axial positioning is ensured.

According to the above-mentioned embodiment, the following effects can be obtained. (1) Since the rigidity imparting portion 46 is formed on the inner peripheral portion of the inner flange portion 44 of the cover 40, when the cover 40 is press-fitted into the inside of the magnet 20, the inner flange portion 44 is undulated. Even if the stress for deforming is applied, the rigidity imparting portion 46 sufficiently resists this stress, so that the inner flange portion 44 is prevented from being deformed in a wavy state. Therefore, the inner flange portion 44 of the cover can be properly fixed to the closing wall 14 of the yoke 11.

(2) The bulging portion 47 formed by bulging the cylindrical wall 41 of the cover 40 outward in the radial direction is formed over the entire axial length of the space between the adjacent magnets 20, 20. The magnet 20 is reliably positioned and fixed in the circumferential direction and the radial direction, and the outer flange portion 4 is provided on the upper end side of the cover 40 so as to project outward in the radial direction.
By pressing 2 onto the upper end surface of each magnet 20, the magnets are reliably positioned in the axial direction, so that fixing with an adhesive can be omitted.

FIG. 3 shows a rotor of a magneto-generator according to a second embodiment of the present invention, (a) is a plan view and (b) is a front sectional view taken along the line bb of (a). is there.

The second embodiment differs from the first embodiment in that
Instead of omitting the case and omitting the elasticity imparting portion on the inner peripheral edge portion of the outer collar portion 42A of the cover 40A, the axial positioning portion 48 is radially provided on the bottom portion of the cylindrical wall 41 of the cover 40A. The point is that it is bulged inward and formed into a ring shape.

According to the second embodiment, the following effects can be obtained in addition to the effects of the first embodiment. (1) With the outer flange portion 42A of the cover 40A in contact with the upper surface of each magnet 20, the cylindrical wall 4 of the cover 40A.
By swelling the yoke closing wall side portion of No. 1 outward in the radial direction, the respective magnets 20 are axially bulged to the outer flange portion 42A of the cover 40A and the yoke closing wall side portion of the cover cylinder wall 41. It can be fixed while being sandwiched by the positioning portion 48.

(2) According to the above (1), the height positions of the magnets 20 are aligned on the outer flange portion 42A of the cover 40A, and the dimensional variation of the magnets 20 in the height direction is on the closed wall side of the yoke 11. Since they are absorbed respectively, the axial length of the rotor of the magneto generator can be shortened.

(3) According to the above (1), since the magnet case can be eliminated, the number of parts and work steps can be reduced, and the step of press-fitting the magnet 20 into the magnet case is eliminated. As a result, damage to the magnet can be avoided and the strictness of dimensional control of the magnet 20 can be eased.

(4) When the bottom portion of the cylindrical wall 41 of the cover 40A is bulged outward in the radial direction, the cover 40A is pushed down and the bulging margin is supplied from above.
Since it is possible to prevent an excessive tensile stress from acting on the inner flange portion 44 of the cover 40A fixed to the yoke 11, it is possible to prevent the inner flange portion 44 of the cover 40A from being damaged.

FIG. 4 shows a rotor of a magneto-generator which is Embodiment 3 of the present invention, (a) is a partially cutaway plan view,
(B) is a front sectional view taken along the line bb of (a).

The third embodiment is different from the first embodiment in that
Instead of omitting the case, a magnet supporting portion 18 is bulged radially inward at the bottom of the side wall 12B of the yoke 11B to form an annular shape.
The bottom surface of each magnet 20 is pressed and positioned.

According to the third embodiment, in addition to the effect of the first embodiment, the effect that the magnet case can be omitted can be obtained.

FIG. 5 shows a rotor of a magneto-generator according to a fourth embodiment of the present invention, (a) is a partially cutaway plan view,
(B) is a front sectional view taken along the line bb of (a).

The difference of the fourth embodiment from the first embodiment is that
The rigidity imparting portion 46C is the fixing hole 45 in the inner collar portion 44C.
It is located at an intermediate position closer to the outer side than the gutter shape having a substantially semicircular cross section, and is curved and formed into a circular ring shape.

According to the third embodiment, in addition to the effect of the first embodiment, since the rigidity imparting portion 46C is formed in the gutter shape, the rigidity of the inner flange portion 44C is further enhanced. can get.

[0049]

As described above, according to the present invention,
The magnet can be firmly fixed over the entire length in the axial direction, and the cover can be properly fixed to the bottom of the yoke.

[Brief description of drawings]

1A and 1B show a rotor of a magneto-generator according to an embodiment of the present invention, in which FIG. 1A is a partially cutaway plan view and FIG. 1B is FIG. 1A.
3 is a front cross-sectional view taken along line bb of FIG.

FIG. 2 is an exploded perspective view thereof.

FIG. 3 shows a rotor of a magneto-generator that is Embodiment 2 of the present invention, (a) is a plan view, (b) is bb of (a).
It is a front sectional view which follows a line.

[Fig. 4] Fig. 4 shows a rotor of a magneto-generator that is Embodiment 3 of the present invention, (a) is a partially cutaway plan view, and (b) is (a).
3 is a front cross-sectional view taken along line bb of FIG.

[Fig. 5] Fig. 5 shows a rotor of a magneto-generator that is Embodiment 4 of the present invention, in which (a) is a partially cut plan view and (b) is (a).
3 is a front cross-sectional view taken along line bb of FIG.

[Explanation of sign]

11, 11B ... Yoke, 12, 12B ... Cylindrical wall, 13 ... Reactor, 14 ... Closure wall, 15 ... Shaft hole, 16 ... Case fixing convex portion, 17 ... Cover fixing convex portion, 18 ... Magnet supporting portion, 20 ... magnet, 21 ... arc-shaped inner peripheral surface (abdominal surface), 22 ... outer peripheral surface, 23 ... inclined surface portion, 24 ... rising side surface, 25 ... upper surface, 26 ... lower surface, 30 ... case, 31
… Rings, 32… Partitions, 33… Magnet storage chambers, 3
4 ... Fixing recess, 40, 40A ... Cover, 41 ... Cylindrical wall,
42, 42A ... Outer collar portion, 43 ... Elasticity imparting portion, 44 ... Inner collar portion, 45 ... Fixing hole, 46 ... Stiffness imparting portion, 47 ... Circumferential positioning portion, 48 ... Axial positioning portion.

Claims (1)

[Claims] 1. A magnet generator in which a plurality of magnets are arranged at intervals in the circumferential direction on the inner circumference of a substantially bowl-shaped yoke, and a cylindrical cover is press-fitted and fixed inside the magnet. In the rotor, a bulging portion formed by bulging the cylindrical wall of the cover outward in the radial direction is formed over the entire axial length of the space between the adjacent magnets, and the bulging portion is formed on the yoke opening side of the cover. The outer flange portion projecting outward in the direction is in contact with the yoke opening side end surface of each magnet, and the inner flange portion radially inwardly projecting toward the yoke closing wall side of the cover. However, the rotor of the magneto-generator is characterized in that it is fixed to the yoke closing wall, and a rigidity imparting portion is formed in an annular shape in the inner flange portion.