JPH0688547B2 - Bicycle generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a power generator for a bicycle, in which a stator is fixed to a wheel shaft and a rotor is rotated by the rotation of the wheel to generate an electromotive force in a coil in the stator. Regarding the device.

(Prior Art) As previously shown in FIGS. 4 to 7, the present applicant has formed the projecting pieces 11a at equal intervals so as to face the magnetic poles of the magnet ring body 10 having the magnetic poles alternately polarized in the radial direction. The yoke ring body 11 is concentrically arranged in the magnet ring body 10, and the magnet ring body 10 is rotated as the wheel rotates, and the magnetic flux from the S pole of the magnet ring body 10 is opposed to the protrusion of the yoke ring body 11. Returning to the N pole of the magnet ring body 10 through 11a, the south pole and the N pole of the magnet ring body 10 rotating with each projecting piece 11a are alternately opposed to each other regularly, and attraction and repulsion are regularly repeated. Coil in ring 11
We invented a bicycle generator that generated electromotive force.

(Problems to be Solved by the Invention) In the above-mentioned prior art, since each polarized magnetic pole of the magnet ring body and each protrusion of the yoke ring body face each other in the same state, Since the attraction force and the repulsion force between the magnetic pole and each of the projecting pieces facing this are simultaneously generated with the same force,
When the wheels are rotated, there is a problem that cocking occurs regularly and the user feels uncomfortable.

(Means for Solving the Problems) An object of the present invention is to solve the above problems, and a magnet ring body having magnetic poles that are alternately polarized and magnetized is rotatably attached to a wheel shaft hub and a wheel spoke. , A bicycle power generation in which a yoke ring having projecting pieces facing the magnetic poles of the magnet ring is disposed inside the magnet ring and fixed to a wheel shaft, and an electromotive force is generated in a coil inside the yoke ring. In the device, the intervals between the protrusions of the yoke ring are made unequal,
It is characterized in that the attraction force and the repulsion force of the magnetic poles and the protrusions when the magnet ring is rotated are irregular in time so as to reduce cocking.

Hereinafter, a specific description will be given based on the embodiment shown in FIGS. 1 to 3. Reference numeral 1 is a magnet ring body, in which N poles and S poles are alternately polarized and magnetized in the radial direction. Reference numeral 2 denotes a yoke ring body, and a large number of projecting pieces 2a ′, 2b ′ are integrally formed on the outer circumference of the two yoke discs 2a, 2b and bent at a right angle to project the central portions of the yoke discs 2a, 2b. Circular recess 2 by deep drawing to half the length of the pieces 2a ', 2b'
a "and 2b" are formed, the circular recesses 2a "and 2b" are superposed and integrated with the pin 4, and the protruding pieces 2b 'are alternately inserted between the protruding pieces 2a'. The interval between the piece 2a 'and the piece 2b' is alternately set to a ratio of 1: 3 as shown in FIG.
The coil 3 is arranged in the annular space formed by. Protrusion
The width of 2a 'and 2b' is about 74% of the pole surface of the magnet.

Next, the operation will be described. When the wheel is rotated, the magnet ring 1 integrated with the spoke rotates together with the hub rotatably attached to the wheel shaft. Since the yoke ring body 2 is fixed to the wheel shaft, the projecting piece 2a 'of the yoke ring body 2 facing the magnetic flux from the S pole of the magnet ring body 1 faces the projecting piece 2a'.
It returns to the N pole of the magnet ring body 1 through b '. The projecting pieces 2a ', 2 of the yoke ring body 2 on which the magnet ring body 1 rotates and is fixed.
The S pole and the N pole are alternately opposed to b ', the magnetic flux path is alternately changed, and an electromotive force is generated in the coil 4.
Since the intervals of a ', 2b' are not constant and are in a ratio of 1: 3, the attraction and repulsion force of each protruding piece 2a ', 2b' do not occur at the same time and become irregular. Cocking is reduced compared to the conventional device in which the pieces are arranged at equal intervals, and the rotation of the wheels is smooth and light.

(Effect) According to the present invention, a magnet ring having magnetic poles that are alternately polarized and magnetized is rotatably attached to a hub of a wheel shaft and spokes of a wheel, and a yoke having a projecting piece facing the magnetic pole of the magnet ring. In a bicycle generator in which an annulus is disposed in a magnet annulus and is fixed to a wheel shaft to generate an electromotive force in a coil in the yoke annulus, the intervals between the protrusions of the yoke annulus are not varied. In addition, since the attraction force and repulsion force of the magnetic poles and the projecting pieces during rotation of the magnet ring are made irregular in time to reduce cocking, the stator of the generator installed on the wheel shaft when the wheel rotates. , Rotor suction,
There is little cocking due to repulsion and the wheel can be smoothly and lightly rotated.

[Brief description of drawings]

FIG. 1 is a front view of an essential part of the present invention, and FIG. 2 is AA of FIG.
FIG. 3 is a side sectional view, FIG. 3 is a developed partial view of the magnetic poles of the magnet ring body and the protruding pieces of the yoke ring body of FIG. 1, FIG. 4 is a front view of the main part of the bicycle to which the conventional device is attached, and FIG. 4 is a perspective view of the yoke ring body of FIG. 4, FIG. 6 is a front view of the magnet ring body and the yoke ring body of FIG. 4, and FIG. 7 is a development of the magnetic poles of the magnet ring body of FIG. FIG. 1 ... Magnet ring 2 ... Yoke ring 2a, 2b ... Yoke disk 2a ', 2b' ... Projection piece

Claims (1)

[Claims] 1. A yoke ring body having magnet poles which are alternately polarized and magnetized is rotatably attached to a hub of a wheel shaft and spokes of a wheel, and a yoke ring body having a projecting piece facing the magnetic poles of the magnet ring body. In a bicycle generator in which a magnet ring is arranged and fixed to a wheel shaft to generate an electromotive force in a coil in the yoke ring, the intervals between the protrusions of the yoke ring are made unequal, A power generator for a bicycle, characterized in that the attraction force and repulsion force of the magnetic poles and the projecting pieces when the magnet ring is rotated are irregular in time so as to reduce cocking.