JP3281246B2 - Rotor of magnet generator, method of manufacturing the same, and boss member used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing a rotor of a magnet generator, and more particularly to a technique for manufacturing a combined body of a yoke and a boss member.
The present invention relates to a magnet generator used in an outboard motor, a portable generator, and the like, which is effective when used in a manufacturing technique of the rotor.

[0002]

2. Description of the Related Art In general, as a magnet generator, a rotor having a plurality of magnets arranged at equal intervals on an inner peripheral surface of a substantially bowl-shaped yoke, and a plurality of emission coils are provided inside a yoke of the rotor. , And the emitted electrons are radially arranged at
In some cases, the emitted light is fixed to the outer shell of the engine or the like, and the rotor is fitted to the rotating shaft of the engine. In this magnet generator, an electromotive force is generated in an electromotive coil by rotating a rotor around an electromotive force by rotation of a rotating shaft driven by an engine and relatively moving in a magnetic field of a magnet of the rotor. Is induced.

A rotor used in such a magnet generator is disclosed in Japanese Utility Model Publication No. Hei 6-13594. The rotor of this magnet generator has a boss member formed in a substantially cylindrical shape having a flange on the outer circumference and a male serration formed on a part of the outer circumference of the cylindrical shape, and a substantially bowl-shaped rotor formed on the bottom wall thereof. And a yoke in which a substantially cylindrical fitting portion is formed around the formed boss member insertion opening and a female serration is formed on the inner periphery of the fitting portion. The outer periphery of the boss member is buckled and fixed to the yoke in a state where the serrations are connected to each other and the inner main surface of the flange is in close contact with the outer surface of the bottom wall of the yoke.

[0004]

However, in a rotor of a magnet generator in which a boss member is fixed to a yoke in a state where an inner main surface of a flange is in close contact with an outer surface of a bottom wall of a yoke,
When a hardened surface is formed by high-frequency hardening on the tapered inner peripheral surface of the boss member to which the engine-side rotating shaft is tapered, the outer peripheral side of the flange is warped in a direction away from the cylindrical portion. Due to the deformation, the contact force on the outer peripheral side of the contact surface of the flange of the boss member with the bottom wall of the yoke is lower than the contact force on the center portion side, and the rotation is accompanied by the rotation of the rotor of the magnet generator. The stress due to the rotating bending load acts greatly, and the durability may decrease.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor for a magnet generator which can prevent a decrease in durability even when a quenched surface portion is formed on a tapered inner peripheral surface of a boss member by induction hardening. Is to provide.

[0006]

As a means for solving the above-mentioned problems, the present invention provides a flange by adding a design to a taper inner peripheral surface of a boss member in consideration of a warp caused by an induction hardening process. After the induction hardening process, the warp due to the induction hardening process is absorbed by the flange, and the outer peripheral side of the contact surface of the flange of the boss member with the bottom wall of the yoke is securely adhered to the bottom wall of the yoke. Things.

According to the above-mentioned means, since the rotating bending load accompanying the rotation of the rotor of the magnet generator acts on the outer peripheral portion of the flange, the stress of the rotating bending load on the flange is reduced, and the relative bending load is reduced. In addition, the durability against the bending load of the flange is improved, and the durability of the rotor of the magnet generator is improved.

[0008]

FIG. 1 shows a main part of a rotor of a magnet generator according to an embodiment of the present invention. FIG. 1A is a front sectional view of a boss member before induction hardening. b) is a front sectional view of the boss member after the induction hardening treatment, and (c).
FIG. 3 is a front sectional view after buckling and crimping. 2A and 2B show the entirety thereof. FIG. 2A is a partially cut plan view, and FIG. 2B is a front sectional view taken along line bb of FIG. 3A and 3B show the boss member after the induction hardening process, wherein FIG. 3A is a plan view, FIG. 3B is a partially cut front view, and FIG. 3C is an enlarged view of a part c of FIG. FIG. 3B is an enlarged view of a portion d in FIG. FIG.
7A and 7B show a comparative example for explaining the warp absorbing action of the flange, in which FIG. 7A is a front sectional view of a boss member before induction hardening, and FIG. 7B is a front sectional view of the boss member after induction hardening. FIG. 1C is a front sectional view after buckling and crimping.

In this embodiment, the rotor of the magnet generator according to the present invention includes a yoke to which a boss member is fixed. The yoke 11 is integrally formed in a substantially bowl shape having one end face (hereinafter, referred to as an upper face) opened and a lower face closed by a magnetic material, and a bottom wall (hereinafter, referred to as a bottom face) closing a lower face of the cylindrical side wall 12 of the yoke 11. , Sometimes referred to as the yoke bottom wall.)
At 13, a boss member insertion opening 14 is opened concentrically. A fitting portion 15 is provided on the yoke bottom wall 13 around the boss member insertion opening 14 to project into a short cylindrical shape by bending the yoke bottom wall 13 by burring. A plurality of large-diameter circular holes 16 (six in this embodiment) are provided at an intermediate portion of the yoke bottom wall 13 at equal intervals in the circumferential direction on a concentric circle of the boss member insertion opening 14. Further, on the bottom surface of the yoke bottom wall 13, a plurality of convex portions 17 (six in this embodiment) for fixing the cover are arranged between the circular holes 16 on the concentric circle of the boss member insertion opening 14. Then, a part of the yoke bottom wall 13 is protruded inward in the axial direction (upward) by being pushed up from the outer surface. Each projection 17 is formed in a small-diameter and short cylindrical shape to be fitted with a fixing hole and a push nut portion of a cover described later.

A boss member 18 is inserted into the boss member insertion opening 14 of the yoke 11 from the outer surface side of the yoke bottom wall 13 and is serrated and is firmly fixed by buckling and crimping. That is, the boss member 18 is made of a structural material having high mechanical strength such as steel, and has a substantially cylindrical shape having a circular ring-shaped flange 19 on the outer periphery of one end as shown in FIG. Is formed. In the hollow portion of the boss member 18, a tapered inner peripheral surface 20 is formed halfway so as to gradually increase in diameter toward the flange 19 side, and the tapered inner peripheral surface 20 is a rotating shaft (not shown) of the engine. Are set so as to be taper-coupled to the tapered outer peripheral surface. Further, a hardened surface portion 21 is uniformly formed at a constant depth on the tapered inner peripheral surface 20 by induction hardening.

A male serration 2 is provided on the outer periphery of the boss member 18.
2b is formed. On the other hand, as shown in FIG. 1C and FIG.
A female serration 22 is provided on the inner periphery of the fitting portion 15 projecting from
a is formed. As shown in FIG. 1C, the outer surface of the yoke bottom wall 13 (hereinafter, referred to as the lower surface) is fitted to the fitting portion 15 of the boss member insertion port 14 with the side opposite to the flange 19 facing forward. ) Is inserted from the side, and the male serrations 22b are pressed into the female serrations 22a and are serrated and connected to the yoke bottom wall 13. The inner periphery of the fitting portion 15 of the boss member insertion port 14 and the boss member 1
8 is firmly stopped from rotating and joined. Thereafter, a buckling caulking portion 23 is formed at a position on the outer periphery of the boss member 18 opposite to the flange 19 of the serration coupling portion 22, and the yoke bottom wall 13 is attached to the buckling caulking portion 2.
By being sandwiched between the flange 3 and the flange 19, a play in the axial direction is firmly prevented.

Here, as shown in FIG. 1A, before the induction hardening process on the tapered inner peripheral surface 20 of the boss member 18, the flange 19 of the boss member 18 is brought into contact with the yoke bottom wall 13. On the contact surface (hereinafter referred to as the upper surface), a deformation absorbing inclined surface portion 24 having an inclination gradually protruding upward toward the outer peripheral portion is formed in advance in an extremely shallow mortar shape. The inclination angle θ of the deformation absorbing inclined surface portion 24 is set so as to absorb the warp of the flange 19 due to the induction hardening process described later and to strongly adhere the upper surface of the flange 19 to the lower surface of the yoke bottom wall 13. , 1
It is set to about 0 'to 20'. That is, when the flange 19 is warped by the induction hardening process, the deformation absorbing inclined surface portion 24 is set so that the inclined surface is eliminated and becomes a plane orthogonal to the axis of the boss member 18.

By the way, as shown in FIGS. 1B and 4B, the tapered inner peripheral surface 20 of the boss member 18 is formed.
It has been found by the present inventors that when the quenched surface portion 21 is formed by the induction hardening process, the flange 19 is gradually deformed downwardly toward the outer peripheral portion. This deformation occurs because, as indicated by arrows in FIGS. 1B and 4B, a tensile stress toward the quenching surface portion 21 is generated in the boss member 18 by the induction hardening process, It is considered that the flange 19 is pulled so as to warp. Then, FIG.
When the deformation absorbing inclined surface portion 24 is not formed on the flange 19, the upper surface of the flange 19 gradually lowers toward the outer periphery as shown in FIG.
Of the outer peripheral portion having the inclination angle of the lower surface. When the inclined surface portion S descending from the outer peripheral portion is formed on the upper surface of the flange 19, the flange 19 and the flange 19 are fixed in a state where the boss member 18 is fixed to the yoke bottom wall 13, as shown in FIG. A gap G that gradually widens toward the outer peripheral portion is formed between the contact surfaces with the yoke bottom wall 13. As a result, the rotational bending load accompanying the rotation of the rotor of the magnet generator acts on the base end of the flange 19 to increase the stress of the rotational bending load on the flange 19, so that the flange 19 is relatively durable against the bending load. And the durability of the rotor of the magnet generator is reduced.

In the present embodiment, since the deformation absorbing inclined surface portion 24 is formed in advance on the surface of the flange 19 of the boss member 18 abutting on the yoke bottom wall 13, the boss member 1
When the quenched surface portion 21 is formed on the inner peripheral surface 20 of the taper 8 by high-frequency quenching, as shown in FIG. 1B, it gradually curves downward toward the outer peripheral portion of the flange 19. Due to the deformation, the upper surface of the flange 19 is relatively free of the inclined surface of the deformation absorbing inclined surface 24 and forms a plane perpendicular to the axis of the boss member 18. That is, as shown by the arrow in FIG.
When a tensile stress toward the quenching surface portion 21 is generated in the boss member 18 by the induction hardening process and the flange 19 is deformed so as to be warped, the upper surface of the flange 19 is deformed so that the outer peripheral side is gradually lowered. Since the inclination angle θ of the deformation absorbing inclined surface portion 24 is offset, the upper surface of the flange 19 is just horizontal. In other words, the value of the inclination angle θ of the deformation absorbing inclined surface portion 24 is set in advance so that the upper surface of the flange 19 just forms a horizontal plane after the induction hardening process. When the upper surface of the flange 19 forms a horizontal plane, as shown in FIG. 1C, the boss member 18 is fixed to the yoke bottom wall 13 so that the contact between the flange 19 and the yoke bottom wall 13 occurs. A gap G that gradually widens as the outer peripheral portion is formed between the contact surfaces is not tightly formed, and the entire surface is in strong contact with the whole. As a result, the rotational bending load caused by the rotation of the rotor of the magnet generator acts on the outer peripheral portion of the flange 19, and the stress of the rotational bending load on the flange 19 is reduced. Thus, the durability of the rotor of the magnet generator is improved.

By the way, as shown in FIG. 1B, when the flange 19 is deformed so as to be warped by the induction hardening process, the upper surface of the flange 19 becomes a horizontal plane. On the lower surface of 19, an inclined surface portion 24 'having an inclination angle -.theta. However, even if the inclined surface portion 24 'whose outer peripheral portion is gradually lowered is formed on the lower surface of the flange 19, the durability against the bending load of the flange 19 and the durability of the rotor of the magnet generator are not reduced. That is, on the lower surface of the flange 19, the inclined surface portion 2 whose outer peripheral portion is gradually lowered.
Even if 4 'is formed, the lower surface of the flange 19 does not abut on the yoke bottom wall 13, so that there is no influence on the rotational bending load accompanying rotation of the rotor of the magnet generator.

A plurality of magnets are assembled and fixed in the yoke 11 to which the boss member 18 is firmly fixed as described above, so that the rotor of the magnet generator shown in FIG. 2 is assembled. Can be That is, as shown in FIG. 2, a magnet case (hereinafter, referred to as a case) 25 is inserted on the bottom surface in the yoke 11 and is prevented from rotating. The case 25 is made of a non-magnetic material having appropriate strength and heat resistance, such as nylon resin, and is integrally formed. The case 25 is formed in a circular ring shape having an outer diameter inserted into the inner periphery of the side wall 12 of the yoke 11. 26. A plurality of partition walls 27 (six in the present embodiment) are provided at one end surface of the ring 26, are arranged at equal intervals in the circumferential direction, and project at right angles in the axial direction.
Each magnet accommodating chamber 28 is formed by a section between 7 and 27. On the lower surface of the ring 26, a plurality of detent protrusions 31 are arranged at equal intervals in the circumferential direction and project at a right angle in the axial direction. Each detent protrusion 31 is formed on the bottom wall 13 of the yoke. Each of them is fitted into the detent hole 32.

Each magnet 33 is accommodated in each magnet accommodating chamber 28 of the case 25, and the outer peripheral surface of each magnet 33 is in contact with the inner peripheral surface of the side wall 12 of the yoke 11. That is, the magnet 33
Is integrally formed into a hexahedron having a height equal to or less than the depth of the yoke 11 and having an arc shape curved along the inner periphery of the yoke 11 in the width direction. In the state of being housed in the magnet housing chamber 28, both side surfaces of the magnet 33
7 are in contact with each other, and the magnet 3
Reference numeral 3 denotes a state in which the circumferential direction is determined by the partition walls 27 and 27.

A magnet cover (hereinafter referred to as a cover) is fitted inside the case 25 and the group of magnets 33 arranged along the inner peripheral surface of the side wall 12 of the yoke 11. The cover 34 is made of a metal material such as a thin iron plate, and is integrally formed into a cylindrical shape that is press-fitted into the circumference formed by the group of magnets 33 by drawing press working. At the upper end of the cylindrical wall 35 of the cover 34, a circular ring-shaped outer flange portion 36 is provided so as to protrude outward in the radial direction, and at the lower end of the cylindrical wall 35 of the cover 34, a circular ring-shaped inner flange portion 37 is provided. It protrudes inward in the radial direction. At the radially intermediate portion of the inner flange portion 37, fixing holes 38 are formed so as to be the same number as the projections 17 of the yoke 11 (six in this embodiment), and to be aligned with the projections 17 of the yoke 11. Has been
The fixing hole 38 is formed so as to be able to fit with the projection 17. In addition, a plurality of cutouts 39 (six in this embodiment) are formed in the inner peripheral edge of the inner flange 37 in a substantially semicircular shape, and each of the cutouts 39 appropriately fits the circular hole 16 of the yoke 11. It is set so that you can escape. Furthermore, the inner collar 3
A rigidity imparting portion 40 is formed on the inner peripheral edge of 7 by bending and raising over the entire periphery including the cutout portions 39.

The covers 34 are arranged along the inner peripheral surface of the side wall 12 of the yoke 11 and fitted into the inner periphery of the group of magnets 33 positioned by each partition 27 of the case 25. With this fitting, the cylindrical wall 35 of the cover 34
Is slightly swelled radially outward over the entire length, so that a detent swelling portion (not shown) is formed in a space between the adjacent magnets 33. In other words, the position of each magnet 33 in the circumferential direction is restricted by the rotation preventing bulging portion formed by bulging the entire length of the cylindrical wall 35 of the cover 34, and the magnet 33 is pressed and fixed to the inner circumference of the side wall 12 of the yoke 11. State. Cover 34 is magnet 3
When inserted into the third group, the outer flange portion 36 and the inner flange portion 37 are projected from the upper and lower ends of the cover 34, respectively. Improper deformation of 35 is also prevented. Further, since the rigidity imparting portion 40 is bent at the inner end side of the inner flange portion 37, the deformation of the inner flange portion 37 is also prevented.

The inner flange 37 of the cover 34 is the bottom wall 1 of the yoke.
3, the inner flange portion 37 of the cover 34
In this state, the respective convex portions 17 of the yoke 11 are inserted into the respective fixing holes 38 formed in the above. The outer flange 3 of the cover 34
6 comes into contact with the yoke opening side end surface of each magnet 33.

A push nut ring 43 is mounted on the inner flange 37 of the cover 34 fitted inside the magnet 33 group. The push nut ring 43 is made of a plate material having high elasticity such as a steel plate and is integrally formed by drawing press working, and has a main body 44 formed in a circular ring shape substantially equal to the shape of the inner flange portion 37 of the cover 34.
It has. A plurality of (six in the present embodiment) cutouts 45 having a substantially semicircular shape are cut in the inner peripheral edge of the main body 44 at equal intervals in the circumferential direction. A plurality of push nuts 46 (six in the present embodiment) are formed in the radially intermediate portion of the main body 44 between the notches 45. The push nut portion 46 is formed by cutting and raising a part of the main body 44, and has a cut-and-raised hole 47 cut and raised so that the diameter of the opening is slightly smaller than the convex portion 17 of the yoke 11. Four cut-out holes 48 arranged at equal intervals in the circumferential direction and cut inward in the radial direction on the opening edge of the raised hole 47, and four engaging members formed respectively by the cut-and-raised hole 47 and the cut-out hole 48. And a stop claw 49.

The push nut ring 43 constructed as described above is mounted on the inner flange 37 of the cover 34 inserted inside the group of magnets 33. That is, the cover 3
The respective push nut portions 46 of the push nut ring 43 are respectively aligned with the respective projecting portions 17 of the yoke 11 projecting upward from the fixing holes 38 of the inner flange portion 37 of the fourth. Subsequently, the push nut ring 43 is pushed down as a whole in the direction of the yoke bottom wall 13, and the respective push nut portions 46 are fitted into the respective convex portions 17. That is, the protrusion 17 is relatively press-fitted into the cut-and-raised hole 47 of the push nut portion 46 from below in the cut-and-raised direction. Due to this press-fitting, the respective locking claws 49 of the push nut portion 46 are locked obliquely upward on the outer periphery of the convex portion 17, so that the push nut portion 46 is prevented from moving upward from the convex portion 17. State. As a result, the push nut ring 43 is entirely fixed to the yoke bottom wall 13 by the push nut portions 46 and the protrusions 17, so that the cover 34
The inner flange 37 is fixed to the yoke bottom wall 13 by the push nut ring 43.

The stepped portion of the cover 34 is pushed down by the lower surface (the side surface of the inner flange portion 37) of the push nut ring 43 and is elastically linearly deformed. A storage part 42 is formed. Since the elasticity of the cover 34 itself is stored in the power storage portion 42, the cover 34 strongly presses down each magnet 33 via the outer flange 36. Therefore, the cover 34 can be fixed to the yoke 11 in a state where the magnets 33 are constantly pressed down and biased.

FIG. 5 shows a main part of a rotor of a magnet generator according to a second embodiment of the present invention. FIG. 5A is a front sectional view of a boss member before induction hardening, and FIG. FIG. 4 is a front cross-sectional view of the boss member after quenching, and FIG. 4C is a front cross-sectional view after buckling and crimping.

The second embodiment differs from the first embodiment in that a large-diameter flange 19A is formed on the boss member 18. A clutch outer of a one-way clutch for intermittently transmitting power between a starter motor (not shown) and a rotating shaft of the engine is attached to the flange 19A.

FIG. 6 shows a main part of a rotor of a magnet generator according to a third embodiment of the present invention. FIG. 6A is a front sectional view of a boss member before induction hardening, and FIG. FIG. 4 is a front cross-sectional view of the boss member after quenching, and FIG. 4C is a front cross-sectional view after buckling and crimping.

The third embodiment differs from the first embodiment in that, as shown in FIG. 6A, the boss member 18 is subjected to a high-frequency hardening process on the tapered inner peripheral surface 20 of the boss member 18. Instead of the deformation absorbing inclined surface portion, a deformation absorbing convex portion 24B is formed in a circular ring shape on the outer peripheral portion of the upper surface which is the contact surface with the yoke bottom wall 13 in the flange 19 of FIG. The inclination angle θ of a line connecting the top surface of the deformation absorbing convex portion 24B and the upper surface at the base end of the flange 19.
Is the inclination angle θ of the deformation absorbing inclined surface portion 24 of the first embodiment.
Is set to be equal to That is, the inclination angle θ of the deformation absorbing convex portion 24 is set so as to absorb the warp of the flange 19 due to the induction hardening process, and to strongly adhere the upper surface of the flange 19 to the lower surface of the yoke bottom wall 13. , About 10 'to 20'.

In the third embodiment, since the deformation absorbing convex portion 24B is previously provided on the outer peripheral portion on the upper surface of the flange 19, the tapered inner peripheral surface 20 of the boss member 18 is hardened by induction hardening. When the surface portion 21 is formed, as shown in FIG.
Of the flange 19, the deformation absorbing convex portion 24B of the flange 19 is relatively formed.
A plane connecting the top surface of the boss member and the upper surface at the base end of the flange 19 is in a state in which the inclination angle θ is eliminated and a plane perpendicular to the axis of the boss member 18 is formed. That is, when the flange 19 is deformed so as to be warped by the induction hardening process, the upper surface of the flange 19 is deformed so that the outer peripheral side is gradually lowered, so that the protrusion of the deformation absorbing convex portion 24B is offset. The plane connecting the top surface of the deformation absorbing projection 24B of the flange 19 and the top surface at the base end of the flange 19 is just a horizontal plane. In other words, the protrusion amount of the deformation absorbing convex portion 24B is set in advance so that the upper surface of the flange 19 just forms a horizontal plane after the induction hardening process.

The deformation absorbing projection 24 of the flange 19
If the plane connecting the top surface of B and the upper surface at the base end of the flange 19 forms a horizontal surface, the boss member 18 is fixed to the yoke bottom wall 13 as shown in FIG. In the outer peripheral portion of the flange 19, the top surface of the deformation absorbing convex portion 24B comes into close contact with the yoke bottom wall 13. As a result, the rotating bending load accompanying the rotation of the rotor of the magnet generator acts on the outer peripheral portion of the flange 19, and
9, since the stress of the rotating bending load on the bearing 9 is reduced, the durability of the flange 19 against the bending load is relatively improved,
As a result, the durability of the rotor of the magnet generator is improved.

FIG. 7 shows a main part of a rotor of a magnet generator according to a fourth embodiment of the present invention. FIG. 7A is a front sectional view of a boss member before an induction hardening process, and FIG. FIG. 4 is a front cross-sectional view of the boss member after quenching, and FIG. 4C is a front cross-sectional view after buckling and crimping.

The fourth embodiment differs from the first embodiment in that, as shown in FIG. 7A, the boss member 18 is subjected to a high frequency hardening process on the tapered inner peripheral surface 20 of the boss member 18. Is formed with a deformation-absorbing warpage portion 24C which rises toward the outer periphery as a whole. The inclination angle θ of the deformation absorbing warpage portion 24C is set to be equal to the inclination angle θ of the deformation absorbing inclined surface portion 24 of the first embodiment. That is, the inclination angle θ of the deformation-absorbing warpage portion 24C is set so as to absorb the warpage of the flange 19 due to the induction hardening process, and to strongly adhere the upper surface of the flange 19 to the lower surface of the yoke bottom wall 13. , About 10 'to 20'.

In the fourth embodiment, since the deformation absorbing and warping portion 24C is formed on the flange 19 in advance, the quenched surface portion 21 is formed on the tapered inner peripheral surface 20 of the boss member 18 by induction hardening. As shown in FIG. 7 (b), the deformation of the flange 19 gradually lowers toward the outer peripheral portion of the flange 19, so that the inclination angle θ of the flange 19 is relatively eliminated and the boss member 18 Is orthogonal to the axis. In other words, when the flange 19 is deformed so as to be warped by the induction hardening process, the flange 19 is deformed so that the outer peripheral side is gradually lowered, thereby canceling out the warpage of the deformation absorbing warpage portion 24C.
The upper surface of the flange 19 is just horizontal. In other words,
The amount of warpage of the deformation absorbing warpage portion 24C is set in advance so that the upper surface of the flange 19 just forms a horizontal plane after the induction hardening process.

When the upper surface of the flange 19 forms a horizontal plane, the upper surface of the flange 19 is fixed to the yoke bottom wall 13 with the boss member 18 fixed to the yoke bottom wall 13, as shown in FIG. The entire wall 13 is strongly adhered. As a result, the rotational bending load caused by the rotation of the rotor of the magnet generator acts on the outer peripheral portion of the flange 19, and the stress of the rotational bending load on the flange 19 is reduced. Thus, the durability of the rotor of the magnet generator is improved.

Note that the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the gist of the present invention.

For example, the structure for fixing the magnet 33 to the yoke 11 is not limited to using the configuration of the above-described embodiment.
It is desirable to set appropriately according to the conditions.

[0036]

As described above, according to the present invention,
Even when a quenched surface portion is formed on the inner peripheral surface of the taper of the boss member by induction hardening, it is possible to prevent a decrease in durability.

[Brief description of the drawings]

1A and 1B show a main part of a rotor of a magnet generator according to an embodiment of the present invention, wherein FIG. 1A is a front sectional view of a boss member before induction hardening, and FIG. FIG. 7C is a front cross-sectional view of the boss member after processing, and FIG. 7C is a front cross-sectional view after buckling and crimping.

FIGS. 2A and 2B show the entirety, wherein FIG. 2A is a partially cut plan view, and FIG. 2B is a front sectional view taken along line bb of FIG.

3A and 3B show a boss member after induction hardening processing, wherein FIG. 3A is a plan view, FIG. 3B is a partially cut front view, and FIG.
FIG. 4A is an enlarged view of a portion c of FIG. 5A, and FIG.

4A and 4B show a comparative example for explaining a warp absorbing action of a flange, wherein FIG. 4A is a front sectional view of a boss member before induction hardening, and FIG. 4B is a boss member after induction hardening. FIG. 3C is a front sectional view after buckling and crimping.

5A and 5B show a main part of a rotor of a magnet generator according to a second embodiment of the present invention, wherein FIG. 5A is a front sectional view of a boss member before induction hardening, and FIG. FIG. 7C is a front cross-sectional view of the boss member after processing, and FIG. 7C is a front cross-sectional view after buckling and crimping.

6A and 6B show a main part of a rotor of a magnet generator according to a third embodiment of the present invention, wherein FIG. 6A is a front cross-sectional view of a boss member before induction hardening, and FIG. FIG. 7C is a front cross-sectional view of the boss member after processing, and FIG. 7C is a front cross-sectional view after buckling and crimping.

7A and 7B show a main part of a rotor of a magnet generator according to a fourth embodiment of the present invention, wherein FIG. 7A is a front sectional view of a boss member before induction hardening, and FIG. FIG. 7C is a front cross-sectional view of the boss member after processing, and FIG. 7C is a front cross-sectional view after buckling and crimping.

[Explanation of symbols]

11 ... yoke, 12 ... side wall, 13 ... yoke bottom wall, 14 ...
Boss member insertion opening, 15 ... fitting part, 16 ... circular hole, 17 ...
Projection, 18 boss member, 19 flange, 19A large diameter flange, 20 taper inner peripheral surface, 21 hardened surface portion, 22 serration coupling portion, 22a female serration, 22b male serration, 23 ... Buckling part, 2
4: Deformation absorbing inclined surface part, 24B: Deformation absorption convex part, 24C
... Deformation absorption warpage portion, 24 '... Slope surface portion with inclination angle -θ, 2
5. Case (magnet case), 26 ... Ring, 27
... partition wall part, 28 ... magnet storage chamber, 31 ... detent protrusion, 32 ... detent hole, 33 ... magnet, 34 ... cover, 35 ... cylinder wall, 36 ... outer flange part, 37 ... inner flange part, 3
8: fixing hole, 39: notch, 40: rigidity-imparting part, 42:
Energy storage unit, 43: push nut ring, 44: body, 4
5: Notch, 46: Push nut, 47: Cut-out hole, 48: Cut-out hole, 49: Locking claw.

Claims (5)

(57) [Claims] A boss member formed in a substantially cylindrical shape having a flange on the outer periphery, wherein a quenching surface portion is formed on a tapered inner peripheral surface formed in a hollow portion of the substantially cylindrical portion by high-frequency quenching processing; A yoke having a substantially bowl shape and having a boss member insertion opening formed in a bottom wall thereof, wherein the boss member is configured to move the substantially cylindrical portion in front of the yoke.
The boss member insertion hole is inserted from outside the bottom wall,
In the rotor of the magnet generator, the flange of which is fixed to the bottom wall of the yoke, the flange of the boss member before the induction hardening process is
The design considering the warpage due to induction hardening was added.
And the flange of the boss member after the induction hardening treatment
Characterized in that at least the outer peripheral side of the rotor contacts the bottom wall of the yoke . 2. A boss member which is formed in a substantially cylindrical shape having a flange on the outer periphery and has a hardened surface portion formed by a high frequency hardening process on an inner peripheral surface of a taper formed in a hollow portion of the substantially cylindrical shape portion ; A yoke having a substantially bowl shape and having a boss member insertion opening formed in a bottom wall thereof, wherein the boss member is configured to move the substantially cylindrical portion in front of the yoke.
The boss member insertion hole is inserted from outside the bottom wall,
The method of manufacturing a rotor of a magnet generator , wherein a flange is fixed to a bottom wall of the yoke , wherein the induction hardening treatment is performed.
The flange of the previous boss member is designed in consideration of the warpage due to the induction hardening process , and the induction hardening is performed.
At least the outer peripheral portion of the flange of the boss member after the treatment
A method for manufacturing a rotor of a magnet generator, wherein a side of the rotor contacts a bottom wall of the yoke . 3. A boss member used in the method for manufacturing a rotor of a magnet generator according to claim 2, wherein the flange of the boss member before the induction hardening treatment is substantially performed.
A boss member, wherein a deformation absorbing inclined surface portion for gradually increasing the thickness of the flange from the central portion side to the outer peripheral portion side is formed on the main surface on the cylindrical portion side . 4. A boss member used in the method for manufacturing a rotor of a magnet generator according to claim 2, wherein the flange of the boss member before the induction hardening treatment is substantially performed.
A boss member characterized in that a deformation absorbing projection is projected from an outer peripheral portion of a main surface on a cylindrical shape portion side . 5. A boss member used in the method for manufacturing a rotor of a magnet generator according to claim 2, wherein the whole of the flange of the boss member before the induction hardening is from a central portion side to an outer peripheral portion. A boss member, wherein a deformation-absorbing warp portion is formed which gradually inclines toward the substantially cylindrical portion as it goes toward the portion.