JPH09117121A - Generator for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost by simplifying the winding work of coil and decreasing the number of components. SOLUTION: A large number of magnets 9 are arranged in the circumferential direction on the outer circumferential surface of a magnetic brake rotor 6 and secured in place. The pole of magnet 9 is formed on the radial end face of brake rotor 6 while reversing the polarity between the adjacent poles. First and second yokes 13, 14 are disposed on the body frame side and an annular yoke 10 surrounding a brake rotor assembly is secured. Pole claws 13b, 14b are disposed at the inner circumferential part of first and second yokes 13, 14. A coil 11b to be applied to the yoke 10 is wound around the axle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle generator mounted on a hub of a bicycle wheel.

[0002]

2. Description of the Related Art Conventionally, as a bicycle generator mounted on a hub of a bicycle wheel, there is one disclosed in, for example, Japanese Unexamined Patent Publication No. 4-27681. In the generator shown in this publication, a magnet is fixed to a brake rotor of a band type rear wheel brake provided on a hub of a rear wheel, and a coil is attached to a brake band support member arranged adjacent to the brake rotor. There is.

The brake rotor is formed in a substantially cylindrical shape having a bottom opening to the side of the vehicle body, and a large number of magnets are fixed to the inner bottom portion in a line in the circumferential direction. The magnet has magnetic poles formed on the radially outer side and the inner side of the brake rotor, and the magnets are arranged so that the N pole and S pole of the adjacent magnets are opposite to each other. Also, the coil is
It is wound around a coil bobbin, and the winding axis is aligned with the radial direction of the brake rotor, and a large number of them are mounted side by side in the circumferential direction on the brake band support member.

[0004]

However, the conventional bicycle generator having the above-described structure has a structure in which the individually wound coils are attached to the brake band supporting members, which increases the manufacturing cost. There was a problem. That is, since the winding work for winding the coil around the coil bobbin, the mounting work for fixing the coil to the brake band support member, and the like must be performed for each coil, a lot of man-hours are required for assembling the coil into the brake, and the coil bobbin It is necessary to prepare the same number as the coil and the number of parts increases.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a bicycle generator in which the manufacturing cost is reduced by simplifying the coil winding work and reducing the number of parts. To do.

[0006]

In the bicycle generator according to the first aspect of the present invention, a magnet is fixed to the outer peripheral surface of a brake rotor made of a magnetic material fixed to a hub of a wheel, and the magnetic pole of this magnet is The brake rotor is formed on the radial end face of the brake rotor, is arranged at equal intervals along the circumferential direction of the brake rotor, and the polarities of adjacent magnetic poles are opposite to each other. The first yoke is fixed to the first yoke and the second yoke, which is formed in an annular shape surrounding the outer peripheral portion of the magnet fixed to the first yoke and is provided with a first yoke at one end in the axial direction and a second yoke at the other end. Magnetic pole claws facing the magnetic poles of the magnet are provided on the inner peripheral portion of the yoke,
Since the magnetic pole claw of the first yoke and the magnetic pole claw of the second yoke are opposed to the magnetic poles having different polarities, and the coil mounted on this yoke is wound around the axle of the wheel, the coil winding work only needs to be performed once. Only one coil bobbin is required. Further, since the coil is arranged outside the magnet in the radial direction of the brake rotor, when the number of turns of the coil is increased, there is no restriction by the brake rotor or the magnet.

In the bicycle generator according to the second aspect of the present invention, a magnet is fixed to the outer bottom surface of a brake rotor made of a magnetic material and having a cylindrical shape with a bottom fixed to a hub of a wheel, and the magnetic pole of this magnet is used as a brake in the magnet. It is formed on the end face in the axial direction of the rotor and arranged at equal intervals along the circumferential direction of the brake rotor, and the polarities of adjacent magnetic poles are opposite to each other. A yoke having a first yoke provided on the inner peripheral side and a second yoke provided on the outer peripheral side and formed in an annular shape facing the axial end surface of the fixed magnet is fixed, and the first yoke and the first yoke are fixed. Magnetic pole claws facing the magnetic poles of the magnets are respectively provided at the ends of the two yokes on the side of the magnet, and the magnetic pole claws of the first yoke and the second yoke are made to face magnetic poles of different polarities. Coil to be attached Since wound to the axle around the wheel, winding operation of the coil may once, coil bobbin may also be one.

Further, since the magnet is fixed to the outer bottom surface of the bottomed cylindrical brake rotor and the magnet and the coil are arranged side by side in the axial direction of the brake rotor, the number of turns of the coil is limited by the brake rotor and the magnet. Never receive. Furthermore, since both the inner peripheral surface and the outer peripheral surface of the bottomed cylindrical brake rotor can be used as the friction surface, as a brake, the brake pad is pressed against the inner peripheral surface of the brake rotor, or the brake pad of the brake rotor is used. Any of the configurations of pressing the outer peripheral surface can be adopted.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment Hereinafter, a bicycle generator according to the first invention will be described in detail with reference to FIGS. 1 to 5. FIG. 1 is an enlarged vertical cross-sectional view showing an essential part of a bicycle generator according to the first invention, and FIG. 2 is a side view showing the bicycle generator according to the first invention as viewed from the left side of the vehicle body. 3 and 4 are side views showing a state where the bicycle generator is viewed from the right side of the vehicle body. In FIG. 3, FIG.
The breakage position of is indicated by the line I-I. 4 is an enlarged side view showing a part of FIG. 2, and FIG. 5 is an exploded perspective view of a yoke portion.

In these figures, reference numeral 1 shows a bicycle generator according to this embodiment. This bicycle generator 1
In this embodiment, is mounted on the rear wheel hub 2 of the bicycle together with the rear wheel brake 3. The hub 2 is rotatably supported by a rear axle 4 fixed to a vehicle body frame (not shown), and supports a rim (not shown) via spokes 5. 1 shows the upper half of the bicycle generator 1 as viewed from the front of the vehicle body, and the bearing portion of the hub 2 is omitted.

The rear wheel brake 3 is a so-called internal expansion type brake, and has a cylindrical bottomed brake rotor 6 attached to an end portion of the hub 2 on the left side of the vehicle body, and is arranged laterally of the brake rotor 6. And the disk-shaped back plate 7 fixed to the body frame, and the back plate 7
It is composed of the brake shoe 8 and the like attached to the. The brake rotor 6 is made of a magnetic material such as an iron material, and the shaft center portion is screwed onto the outer peripheral portion of the hub 2 with the opening of the bottomed cylinder oriented toward the left side (right side in FIG. 1) of the vehicle body. ing.

As shown in FIG. 2, the back plate 7 has an axle coupling member 7a screwed to the axial center thereof screwed onto the axle 4, and a rotation stop stay 7b screwed to the lower portion of the vehicle body frame. It is fixed to the body frame by rigidly connecting to. The brake shoe 8 is attached to the back plate 7 in a state where half parts having a substantially arcuate shape in a side view are arranged in a substantially circular shape, and a brake lever shaft that penetrates a brake shaft hole 7c of the back plate 7 (see FIG. It has a conventionally known structure in which the brake rotor 6 is pressed against the inner peripheral surface of the brake rotor 6 when the brake rotor 6 is rotated.

As shown in FIGS. 1 and 3, the bicycle generator 1 includes a magnet 9 fixed to the outer peripheral surface of the brake rotor 6, and an outer periphery of a brake rotor assembly including the brake rotor 6 and the magnet 9. Ring-shaped yoke 1 surrounding the part
0 and an annular coil assembly 11 arranged in the yoke 10. The magnets 9 are formed in a rectangular parallelepiped shape having a length substantially equal to the axial width dimension of the outer peripheral surface of the brake rotor 6, and a large number of magnets 9 are arranged on the outer peripheral surface of the brake rotor 6 at equal intervals along the circumferential direction. It is adhered by an adhesive. As shown in FIG. 4, the magnet 9 has magnetic poles formed on the radial end surface of the brake rotor 6, and the magnets 9 adjacent to each other are arranged such that the positions of the S pole and the N pole are opposite to each other. There is.

As shown in FIG. 5, the yoke 10 has a cylindrical body 12 in which the outer peripheral portion of the coil assembly 11 is fitted to the inner peripheral surface.
And the first and second yokes 13 and 14 screwed to both ends of the cylindrical body 12 in the axial direction, and the second yoke 14 is arranged on the left side of the vehicle body in a state where these are combined. As shown in FIGS. 1 and 2, the back plate 7 is joined to the outer periphery by fixing screws 15. That is, the yoke 10 is rigidly supported by the vehicle body frame via the back plate 7.

The coil assembly 11 has a structure in which a coil 11b is wound around an annular coil bobbin 11a. As shown in FIG. 1, the coil bobbin 11a has a U-shaped cross section in which a coil winding portion is opened outward in the radial direction.

The cylindrical body 12 and the first and second yokes 13 and 14 are made of a magnetic material, and the first and second yokes are formed.
The yokes 13 and 14 are formed by bending a plate material punched into a predetermined shape by press working.

The first yoke 13 has a large number of magnetic pole claws 13b projecting from the inner peripheral portion of a base 13a formed in the shape of an annular plate at equal intervals in the circumferential direction. As shown in FIG. 1, each magnetic pole claw 13b is formed in an L-shaped cross section so as to extend radially inward from the base 13a and extend axially from the extending end. The extension dimension of the portion extending in the axial direction is set to be substantially equal to the dimension of the magnet 9 in the axial direction of the brake rotor 6. In addition, the width of the portion extending in the axial direction, that is, the dimension of the base portion 13a in the circumferential direction, is as shown in FIGS.
It is set to be shorter than the dimension in the same direction.

Further, as shown in FIG. 3, the number of the magnetic pole claws 13b formed is half of the total number of the magnets 9 arranged in parallel on the outer peripheral surface of the brake rotor 6. In this embodiment, 30 magnets 9 are used and magnetic pole claws 13b are formed at 15 positions. Therefore, since the magnetic pole claws 13b are arranged in parallel in the circumferential direction at equal intervals, the magnetic pole claws 13b face the magnets 9 having the same polarity as shown in FIG. The portion of the inner peripheral portion of the base portion 13a between the magnetic pole claws 13b is recessed in an arc shape in order to guide the magnetic force lines to the cylindrical body 12 side. This concave portion is shown by reference numeral 13c.

The second yoke 14 is the first yoke 1
It has the same structure as 3. That is, in this embodiment, two pieces having the same shape as the first yoke 13 are formed, one is used as the first yoke 13, and the other is turned over and used as the second yoke 14. Reference numeral 14a indicates a base portion of the second yoke 14, 14b indicates a magnetic pole claw, and 14c indicates a concave portion. Further, the first and second yokes 13 and 14 also have through-holes through which fixing screws 16 (FIGS. 1 to 3) for fixing the first and second yokes 13 and 14 are inserted at the same position that divides the outer circumference into 10 equal parts. Has been drilled. That is,
The difference in configuration between the first and second yokes 13 and 14 is that
It is only that a screw hole (not shown) for screwing the fixing screw 15 is provided in the second yoke 14.

To assemble the yoke 10, first, the first yoke 13 is fixed to one end of the cylindrical body 12 in the axial direction, and the coil assembly 11 is attached to the inner peripheral surface of the cylindrical body 12 to form the first yoke 13. Mate from the opposite side. Next, the cylinder 12
The second yoke 14 is fixed to the other end portion in the axial direction of. At this time, the magnetic pole pawl 14b is replaced with the magnetic pole pawl 13b of the first yoke 13.
Face between them. The screw holes for the fixing screw 16 formed in the cylindrical body 12 are arranged at the same position on both sides of the cylindrical body 12. That is, by fixing the first and second yokes 13 and 14 to the cylindrical body 12 with the fixing screw 16, as shown in FIGS. 3 and 4, the magnetic pole claw 14b of the second yoke 14 is also fixed to the first yoke. Like the magnet 13, the magnet 9 faces the magnet 9 having the same polarity. In FIG. 4, the magnetic pole claw 13b faces the N pole and the magnetic pole claw 14b faces the S pole.

In the state shown in FIG. 4, the magnetic flux Φ of the magnet 9 passes through the yoke 10 and the brake rotor 6. That is, the magnetic flux Φ is from the N pole of the magnet 9 shown in the figure to the magnetic pole claw 13b of the first yoke 13 → the base 13a → the cylindrical portion 12 → the base 14a of the second yoke 14 → the magnetic pole claw 14b → It passes through a magnetic circuit of the S pole of the adjacent magnet 9 (denoted by the symbol B) → the N pole of this magnet 9 → the brake rotor 6 → the S pole of the magnet 9 denoted by the symbol A. For this reason, in the bicycle generator 1, when the bicycle travels and the brake rotor 6 rotates together with the rear wheel hub 2, the magnetic flux Φ crosses the coil 11b to generate electric power.

Therefore, in this bicycle generator 1, a large number of magnets 9 are fixed to the outer peripheral surface of the brake rotor 6, and an annular yoke 10 surrounds the outer peripheral portion of the brake rotor assembly.
Is fixed to the body frame side, and the coil 11b to be mounted on the yoke 10 is wound around the axle.
The winding work may be performed once, and the number of coil bobbins 11a may be one. Further, since the coil 11b is arranged outward of the magnet 9 in the radial direction of the brake rotor 6, there is no restriction by the brake rotor 6 and the magnet 9 in increasing the number of turns of the coil 11b.

Second Embodiment The yoke can also be constructed as shown in FIG. FIG. 6 is a sectional view showing another embodiment of the yoke. In the figure, the same or equivalent members as those described in FIGS. 1 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

The yoke 10 shown in FIG. 6 is composed of only two members, a first yoke 13 and a second yoke 14. When connecting the two so that they are not separated from each other, the outer peripheral edge portions of the base portions 13a and 14a are
The cylindrical portions 13d and 14d extending in the opposite direction along the axial direction are integrally formed, and the cylindrical portion 14 of the second yoke 14 is formed.
The outer peripheral portion of the cylindrical portion 13d of the first yoke 13 is press-fitted into the inner peripheral surface of d.

When the yoke 10 is constructed as described above, the number of parts of the yoke 10 is reduced in addition to the number of the coil bobbins 11b being one, so that the cost can be further reduced.

Third Embodiment A bicycle generator according to the second invention will be described in detail with reference to FIGS. 7 and 8. FIG. 7 is an enlarged vertical sectional view showing an essential part of the bicycle generator according to the second invention, and FIG. 8 is an exploded perspective view of the yoke. In these drawings, the same or equivalent members as those described in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description is omitted.

A large number of magnets 9 shown in FIGS. 7 and 8 are formed in a rectangular parallelepiped shape and are bonded to the outer bottom surface of the brake rotor 6 at equal intervals along the circumferential direction. The magnetic poles of the magnets 9 are formed on the end faces of the brake rotor 6 at both ends in the axial direction, and the S poles and the N positions of the adjacent magnets 9 are arranged to be opposite to each other.

The yoke 10 is a first yoke 13 on the inner peripheral side.
And the second yoke 14 on the outer peripheral side, the magnetic pole pawls 13b and 14 of the first and second yokes 13 and 14 are formed.
b has a structure facing the magnet 9 from the right side of the vehicle body. More specifically, in the first yoke 13, the base portion 13a is formed in a cylindrical shape whose axis coincides with that of the brake rotor 6, and the magnetic pole claw 13b is directed radially outward at the end portion of the base portion 13a on the magnet 9 side. It projects so as to extend. Also,
An annular flange 21 extending in parallel with the magnetic pole pawl 13b is integrally formed at the other end of the base portion 13a in the axial direction.

The second yoke 14 has a base portion 14a formed into a cylindrical shape into which the flange 21 of the first yoke 13 can be fitted, and a magnetic pole claw 14b is directed inward in the radial direction at an end portion on the magnet 9 side. It projects so as to extend. In addition, the base 14
A plurality of claw pieces 22 are integrally formed at the other end of a at intervals in the circumferential direction. This claw piece 22 is, as shown in FIG.
When the second yoke 14 is formed, the second yoke 14 is formed so as to project from the base portion 14a along the axial direction, and when the first yoke 13 and the second yoke 14 are combined, the second yoke 14 is directed toward the axial center side as shown in FIG. And fold.

Then, these first and second yokes 1
Similar to the first embodiment, the magnetic pole claws 13a and 14a of the magnetic pole claws 13a and 14a face the S pole of the magnet 9 when the magnetic pole claw 13a faces the N pole of the magnet 9, for example. It is configured to do.

The first and second yokes 1 thus configured
In order to assemble the coils 3 and 14, first, the coil assembly 11 and the first coil assembly 11 and the first coil 14 are formed on the inner peripheral surface of the cylindrical base portion 14a of the second yoke 14.
The flange 21 of the yoke 13 is fitted in this order. Then, the claw piece 22 of the base portion 14a is bent as shown in FIG. As a result, the first and second yokes 13,
The yoke 10 is formed by coupling 14 together.

In this embodiment, the first yoke 1
3 is prevented from coming off the second yoke 14 only by the claw piece 22, so that the claw piece 22 and the first
The flange 21 of the yoke 13 may be welded. In connecting the first yoke 13 and the second yoke 14 to each other, the flange 2 is used without using the claw piece 22.
The outer peripheral surface of No. 1 may be welded to the inner peripheral surface of the base portion 14a.

Therefore, in this bicycle generator, a large number of magnets 9 are fixed to the outer bottom surface of the brake rotor 6, and an annular yoke 10 whose axial end faces oppose the brake rotor assembly is fixed to the vehicle body frame side. Then this york 10
Since the coil 11b to be mounted on the coil is wound around the axle, the coil 11b need only be wound once.
The number of a may be one.

Further, when the configuration of the third embodiment is adopted, the number of turns of the coil 11b is not limited by the brake rotor 6 and the magnet 9.
Further, since both the inner peripheral surface and the outer peripheral surface of the bottomed cylindrical brake rotor 6 can be used as friction surfaces, the pad 8a (FIG. 7) of the brake shoe 8 is used as the rear wheel brake 3 inside the brake rotor 6. In addition to the configuration of pressing on the peripheral surface, a configuration of pressing on the outer peripheral surface of the brake rotor 6 may be adopted.

Further, in each of the above-mentioned embodiments, a large number of magnets 9 are fixed to the brake rotor 6 so as to form an annular shape. However, as the magnets, those integrally formed in an annular shape are used. You can also do it. In this case,
A large number of magnetic poles are formed in the circumferential direction at equal intervals, and adjacent magnetic poles are formed so that the polarities are opposite to each other.

[0036]

As described above, in the bicycle generator according to the first aspect of the present invention, the magnet is fixed to the outer peripheral surface of the brake rotor made of a magnetic material fixed to the hub of the wheel, and the magnetic pole of the magnet is Is formed on the radial end surface of the brake rotor, and is arranged at equal intervals along the circumferential direction of the brake rotor, and the polarities of adjacent magnetic poles are opposite to each other. The first yoke is fixed to the first yoke and the second yoke is fixed to the first yoke and the second yoke is fixed to the surface of the magnet. Magnetic pole claws facing the magnetic poles of the magnets are provided on the inner peripheral portion of the second yoke, respectively, and the magnetic pole claws of the first yoke and the second yoke are opposed to the magnetic poles having different polarities and mounted on this yoke. Coil around wheel axle Since wound wound, winding operation of the coil may once, coil bobbin may also be one.

Therefore, the coil winding work can be simplified and the number of coil bobbins can be reduced, so that a bicycle generator with low manufacturing cost can be obtained.
Also, since the coil is arranged outside the magnet in the radial direction of the brake rotor, when increasing the number of turns of the coil,
There is also an advantage that the structure is not restricted by the brake rotor and the magnet, and the structure of the brake rotor and the magnet can be largely changed.

In the bicycle generator according to the second aspect of the invention, the magnet is fixed to the outer bottom surface of the bottomed cylindrical brake rotor made of a magnetic material fixed to the hub of the wheel, and the magnetic pole of this magnet is used as a brake in the magnet. It is formed on the end face in the axial direction of the rotor and arranged at equal intervals along the circumferential direction of the brake rotor, and the polarities of adjacent magnetic poles are opposite to each other. A yoke having a first yoke provided on the inner peripheral side and a second yoke provided on the outer peripheral side and formed in an annular shape facing the axial end surface of the fixed magnet is fixed, and the first yoke and the first yoke are fixed. Magnetic pole claws facing the magnetic poles of the magnets are respectively provided at the ends of the two yokes on the side of the magnet, and the magnetic pole claws of the first yoke and the second yoke are made to face magnetic poles of different polarities. Coil to be attached Since wound to the axle around the wheel, winding operation of the coil may once, coil bobbin may also be one.

Therefore, the coil winding work can be simplified and the number of coil bobbins can be reduced, so that a bicycle generator with low manufacturing cost can be obtained.
Also, since the magnet is fixed to the outer bottom surface of the bottomed cylindrical brake rotor, and this magnet and the coil are arranged side by side in the axial direction of the brake rotor, there are restrictions on the brake rotor and the magnet when the number of turns of the coil is increased. There is also an advantage that it can be performed without significantly changing the configurations of the brake rotor and the magnet.

Furthermore, since both the inner and outer peripheral surfaces of the bottomed cylindrical brake rotor can be used as friction surfaces, the brake pad may be a structure in which the brake pad is pressed against the inner peripheral surface of the brake rotor, or a brake pad is used. Any of the configurations of pressing the brake rotor against the outer peripheral surface can be adopted. That is, the degree of freedom in designing the brake is high.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view showing a main part of a bicycle generator according to a first invention.

FIG. 2 is a side view showing a state in which the bicycle generator according to the first invention is viewed from the left side of the vehicle body.

FIG. 3 is a side view showing a state where the bicycle generator is viewed from the right side of the vehicle body.

FIG. 4 is a side view showing a part of FIG. 2 in an enlarged manner.

FIG. 5 is an exploded perspective view of a yoke portion.

FIG. 6 is a cross-sectional view showing another embodiment of the yoke.

FIG. 7 is an enlarged vertical sectional view showing a main part of a bicycle generator according to a second invention.

FIG. 8 is an exploded perspective view of a yoke.

[Explanation of symbols]

1 ... Bicycle generator, 2 ... Hub, 3 ... Rear wheel brake, 4
... rear axle, 6 ... brake rotor, 8 ... brake shoe,
9 ... Magnet, 10 ... Yoke, 11 ... Coil assembly, 12 ...
Cylindrical body, 13 ... First yoke, 13b ... Magnetic pole claw, 14 ...
2nd yoke, 14a ... Magnetic pole nail.

Claims (2)

[Claims] 1. A magnet is fixed to an outer peripheral surface of a magnetic material brake rotor fixed to a wheel hub, and a magnetic pole of the magnet is
The magnets are formed on the radial end surface of the brake rotor, are arranged at equal intervals along the circumferential direction of the brake rotor, and the polarities of adjacent magnetic poles are opposite to each other.
On the vehicle body frame side, there is provided a yoke having an annular shape surrounding the outer peripheral portion of the magnet fixed to the outer peripheral surface of the brake rotor, the first yoke being provided at one end in the axial direction and the second yoke being provided at the other end. The first yoke and the second yoke are provided with magnetic pole claws facing the magnetic poles of the magnets on the inner peripheral portions of the first and second yokes, respectively, and the magnetic pole claws of the first yoke and the second yoke have polarities. A bicycle generator characterized in that the coils attached to the yoke are wound around the axle of the wheel. 2. A magnet is fixed to the outer bottom surface of a bottomed cylindrical magnetic rotor made of a magnetic material fixed to a wheel hub, and the magnetic pole of the magnet is formed on the end face of the magnet in the axial direction of the brake rotor. The brake rotors are arranged at equal intervals along the circumferential direction of the brake rotor, and the polarities of adjacent magnetic poles are opposite to each other. The magnet poles fixed to the outer bottom surface of the brake rotor face the axial end faces of the magnets on the vehicle body frame side. A yoke having a first yoke on the inner peripheral side and a second yoke on the outer peripheral side formed in an annular shape is fixed, and end portions of the first yoke and the second yoke on the magnet side are fixed. Magnetic pole claws facing the magnetic poles of the magnets are respectively provided, and the magnetic pole claws of the first yoke and the second yoke are opposed to the magnetic poles having different polarities, and the coil mounted on this yoke is attached to the wheel axle. Winding around A bicycle generator characterized in that