JP3281245B2 - Magnet generator rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a magnet generator, and more particularly to an improvement in a coupling structure between a yoke and a boss member, for example, a small vehicle such as a motorcycle, an outboard motor, a portable generator, and the like. The present invention relates to a magnet generator which is effective when used as a rotor in a magnet generator.

[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 serrations are connected to each other and fitted together, and the outer peripheral portion of the boss member is buckled and fixed to the yoke.

[0004]

However, in a rotor of a magnet generator in which a boss member and a yoke are serrated and fixed by buckling and crimping, if the thickness of the yoke is thin, the buckling occurs. At the time of caulking, the bottom wall of the yoke may be deformed to be warped, and the close contact between the bottom wall of the yoke and the flange of the boss member may be reduced in the outer peripheral portion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor of a magnet generator which can secure the whole contact between the bottom wall of the yoke and the flange of the boss member even when the thickness of the yoke is thin. It is in.

[0006]

In a rotor of a magnet generator according to the present invention, a deformation absorbing groove is formed in a ring shape on a contact surface of a flange of a boss member with a bottom wall of a yoke. The inner diameter of the groove is set to be larger than the outer diameter of the buckled caulked portion.

According to the above-described means, when the outer peripheral portion of the boss member is buckled and fixed to the yoke after the boss member is fitted into the boss member insertion opening of the yoke,
The deformation of the yoke bottom wall generated by buckling and caulking is absorbed by the deformation absorbing groove, so even if stress is applied to the yoke bottom wall, the close contact between the yoke bottom wall and the boss member flange is on the outer periphery There is no drop in the part.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main part of a rotor for generating magnets according to an embodiment of the present invention, wherein (a) is an exploded front sectional view before serration coupling, and (b) is serration. FIG. 7C is an enlarged partial cross-sectional view after the coupling, and FIG. 2A and 2B show the entire structure, in which FIG. 2A is a partially cut-away plan view, and FIG.
It is a front sectional view along a line. 3A and 3B show a boss member, wherein FIG. 3A is a plan view, FIG. 3B is a front sectional view, FIG. 3C is an enlarged view of a portion c of FIG. 3A, and FIG. It is an enlarged view. 4A and 4B show a comparative example for explaining the deformation absorbing effect of the yoke bottom wall, wherein FIG. 4A is an exploded front sectional view before serration coupling, FIG. 4B is an enlarged partial sectional view after serration coupling, and FIG. () Is an enlarged partial 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. The key groove 2 is provided in a part of the tapered inner peripheral surface 20.
1 is cut out over the entire length in the axial direction.

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. 1A, a female serration 22 a is formed on the inner periphery of the fitting portion 15 protruding from the boss member insertion opening 14 of the yoke 11. As shown in FIG. 1B, the boss member 18 is inserted into the fitting portion 15 of the boss member insertion opening 14 from the outer surface side of the yoke bottom wall 13 with the side opposite to the flange 19 being the front, and the male serration is provided. The serrations 22b are press-fitted into the female serrations 22a and serrated and joined to form the serrated joints 22. By the serration connecting portion 22, the inner periphery of the fitting portion 15 of the boss member insertion opening 14 and the outer periphery of the boss member 18 are firmly prevented 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 sandwiched between the buckling caulking portion 23 and the flange 19. As a result, it becomes a state in which axial play is firmly prevented.

As shown in FIG. 1, a deformation absorbing groove 24 having a constant width and a constant depth is formed annularly on a contact surface of the flange 19 of the boss member 18 with the yoke bottom wall 13. I have. The inner diameter D ₂₄ of the deformation absorbing groove 24 is set larger than the outer diameter of the buckling caulking portion 23. That is, the inner diameter D ₂₄ of the deformation absorbing groove 24, the sum of the thickness t of the inner diameter D ₁₄ and the fitting portion 15 of the boss member insertion hole 14 of the yoke 11 (D ₁₄ +
It is set larger than t). Incidentally, the outer diameter of the deformation absorbing groove 24 is set so that the outer peripheral edge thereof is outside the starting point of bending of the yoke bottom wall at the time of buckling described below, and furthermore, the mechanical strength of the boss member 18 is not impaired. Is set as small as possible. The depth of the deformation absorbing groove 24 is set to be as shallow as possible so that the groove bottom is below the lowest point of the bending starting point and the mechanical strength of the boss member 18 is not impaired. .

As shown in FIGS. 1C and 4C, a buckling caulking portion 23 is formed on the outer periphery of the boss member 18 at a position opposite to the flange 19 of the serration coupling portion 22. At this time, it has been found by the present inventors that a deformation occurs in the vicinity of the fitting portion 15 on the yoke bottom wall 13 with the bending starting point P. The reason why this deformation occurs is as shown by the arrow in FIG.
It is considered that the vertical stress due to the buckling and crimping process is changed obliquely downward at the curved portion R formed at the intersection between the outer peripheral surface of the boss member 18 and the flange 19.
Then, as shown in FIG.
When the deformation absorbing groove 24 is not laid in the groove 9, the stress whose direction has been changed obliquely downwardly hits the flange 19 and is changed (reflected) obliquely upward, so that the yoke bottom wall is formed. 13 warps such that the outer peripheral side is separated from the flange 19.

However, in the present embodiment, the deformation absorbing groove 24 is recessed in the contact surface of the flange 19 of the boss member 18 with the yoke bottom wall 13, so that the structure shown in FIG.
As shown in (c), the deformation of the yoke bottom wall 13 near the fitting portion 15 as the bending starting point P is absorbed by the deformation absorbing groove 24, so that the outer peripheral side of the yoke bottom wall 13 is flanged. The phenomenon of warping away from the end face of the 19 is prevented. That is, since the deformation absorbing groove 24 is laid down in the portion where the stress whose direction has been changed obliquely downwards advances, the stress whose direction has been changed obliquely downward is not applied to the flange 1.
As a result, the outer peripheral side of the yoke bottom wall 13 acts as an elastic force for constantly pressing against the end face of the flange 19 without being changed upward so as to be reflected by the end face of the flange 9. By this resilient force, the yoke bottom wall 13 and the flange 19
Between the contact surfaces is always strongly pressed. In other words, since the yoke bottom wall 13 and the flange 19 come into tight contact with each other in a strong and uniform manner over the whole, a state in which the yoke 11 and the boss member 18 are extremely firmly fixed is secured.

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 above 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.
A ring 26 having a circular ring shape with an outer diameter inserted into the inner periphery of the side wall 12 of the yoke 11 is provided. Ring 2
A plurality of partition walls 27 (six in the present embodiment) are provided at one end face of 6, and are arranged at equal intervals in the circumferential direction and project at a right angle in the axial direction. Each magnet accommodating chamber 28 is formed by the section of. 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.

FIGS. 5A and 5B show a rotor of a magnet generator according to another embodiment of the present invention. FIG. 5A is a plan view, and FIG. 5B is a front sectional view taken along line bb of FIG. It is.

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.

It is needless to say that the present invention is not limited to the above embodiment, but can be variously modified without departing from the gist thereof.

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.

[0028]

As described above, according to the present invention,
Even when the thickness of the yoke is thin, it is possible to secure the close contact between the bottom wall of the yoke and the flange of the boss member over the whole. Therefore, even if an axial force acts on the outer periphery of the yoke during rotation of the engine, the force can be effectively received by the flange of the boss member, and a durable magnet generator can be obtained.

[Brief description of the drawings]

FIG. 1 shows a main part of a rotor for generating magnets according to an embodiment of the present invention, in which (a) is an exploded front sectional view before serration coupling, and (b) is an enlarged partial cross section after serration coupling. FIG. 3C is an enlarged partial 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.

FIG. 3 shows a boss member, wherein (a) is a plan view,
(B) is a front sectional view, (c) is an enlarged view of a part c of (a),
(D) is an enlarged view of a d part of (b).

4A and 4B show a comparative example for explaining the deformation absorbing effect of the yoke bottom wall, wherein FIG. 4A is an exploded front sectional view before serration coupling, FIG. 4B is an enlarged partial sectional view after serration coupling, and FIG. (c) is an enlarged partial sectional view after buckling and crimping.

5A and 5B show a rotor of a magnet generator according to another embodiment of the present invention, wherein FIG. 5A is a plan view and FIG.
It is front sectional drawing which follows the -b line.

[Description of Signs] 11 ... Yoke, 12 ... side wall, 13 ... Yoke bottom wall, 14 ...
Boss member insertion opening, 15 ... fitting part, 16 ... circular hole, 17 ...
Convex portion, 18 boss member, 19 flange, 19A large-diameter flange, 20 tapered inner peripheral surface, 21 key groove, 22
... serration joint, 22a ... female serration, 22
b: male serration, 23: buckling portion, 24: deformation absorbing groove, 25: case (magnet case), 26: ring, 27: partition, 28: magnet storage chamber, 31 ...
Non-rotating projection, 32: non-rotating hole, 33: magnet,
34 ... Cover, 35 ... Cylinder wall, 36 ... Outer flange, 37 ... Inner flange, 38 ... Fixed hole, 39 ... Notch, 40 ... Stiffness imparting part, 41 ... Stepped part, 42 ... Power storage part, 43 ... Push nut ring, 44 ... Main body, 45 ... Notch part, 46 ... Push nut part, 47 ... Cut-up hole, 48 ... Cut hole, 4
9 ... locking claw.

Claims (1)

(57) [Claims] And a boss member which is formed in a substantially cylindrical shape having a flange to 1. A periphery, and a yoke boss member insertion opening in the bottom wall thereof is formed in a Ryakuwan shape is opened, the boss with member is fitted to said boss member insertion hole of the yoke, the generally cylindrical of the boss member
In the rotor of the magneto generator which outer periphery of the Jo portion is fixed to the yoke is buckling crimping, deformation absorbing groove to the contact surface of the bottom wall of the yoke in the flange of the boss member is annularly The rotor of the magnet generator, wherein the inner diameter of the deformation absorbing groove is set to be larger than the outer diameter of the buckling caulked portion.