KR101550172B1 - A Generator for a Bike - Google Patents

Abstract

The present invention relates to a generator for a bicycle and, more specifically, relates to a generator for a bicycle, which can be applied to a rim of all types of bicycle wheels. According to the present invention, a generator (20) installed in a relatively fixated position with respect to a rim (10) of a bicycle which is rotated comprises: a rotating body (30) arranged to be adjacent or in contact with the rim (10), wherein a magnet (35) to induce eddy currents along an outer circumferential surface; a rotating shaft (62) of which an end portion of one side is fixated on a center of the rotating body (30); and a generating unit (60) arranged on an end portion of an other side of the rotating shaft (62). At least a portion of an outer circumferential surface of the rotating body (30) is arranged in a more outer side than the outer circumferential surface of the magnet (35) for inducement.

Description

A Generator for a Bike}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bicycle generator, and more particularly, to a bicycle generator that can be applied to rims of all kinds of bicycle wheels.

Eddy current refers to a swirl current flowing on a metal conductor due to an electromotive force generated when the magnetic flux changes in the metal conductor. The power loss due to the eddy current is called an eddy current, and the temperature of the metal conductor is raised by heat loss. The force generated by this eddy current is used in electric brakes in electric power meters and electric trains.

A ferromagnetic substance (ferromagnetic substance) refers to a substance that is strongly magnetized in the direction of its magnetic field when a strong magnetic field is applied from the outside, and remains magnetized even when the external magnetic field disappears. In this case, each atom of matter is like a magnet. Iron (Fe) is a typical ferromagnetic substance.

Non-magnetic material (non-magnetic substance) refers to a substance with a weak magnetic property or a material with no magnetic property at all. And includes a paramagnetic material to be described later. The relative magnetic permeability is close to 1 and is hardly affected by the magnetic field.

A paramagnetic substance is a substance that magnetizes in the direction of a magnetic field when it is placed in a magnetic field and does not magnetize when the magnetic field is removed. These include aluminum, tin, platinum, and iridium. The magnitude of magnetization is proportional to the magnitude of the surrounding magnetic field, and the degree of magnetization is expressed by the magnetic susceptibility. The magnetic susceptibility is inversely proportional to temperature, which is called Curie's Law.

Conventionally, a rotor is installed near a bicycle rim of an aluminum material, and magnets are attached to the periphery of the rotor so that the N pole and the S pole are arranged alternately. By rotating the bicycle rim, The rotor is rotated in a non-contact manner as the rim is rotated by allowing the magnet around the rotor to be attracted by the magnetic action generated by the eddy current, and the rotor around the rotor used to generate the eddy current A generator that induces a current in the coil winding is developed by using a point at which the magnet of the rotor is rotated to place a coil winding around the magnet.

However, such conventional non-contact type generators have the following problems.

First, the aluminum bicycle rim is formed by joining the elongated rim members by bending the circular rim members, so that the joints in the rim making process are made of ferromagnetic iron, There is a problem that the phenomenon of sticking and dropping on the draw is repeated. This damages both the magnet and the rim, disrupts the uniform rotation speed of the rotor, sharply reduces the power generation efficiency, and causes a problem such as a large noise.

Second, such conventional non-contact type generators can not be used for rims made of ferromagnetic material. This is because the magnets installed around the rotor are attracted to the rim in order to induce eddy currents.

Third, such conventional non-contact type generators can not be used for rims made of non-metallic carbon. This is because there is no eddy current in the carbon rim.

Fourth, in order to induce an eddy current, an electromotive force is induced through a magnet attached to a rotor, and a braking force due to a load current is applied by driving a load. Thus, a slip phenomenon The speed of the rim can not keep up with the speed of the rim).

Fifth, since a current is induced by using a magnet attached to the rotor in order to induce an eddy current, a magnet attached to the rotor must be disposed close to the rim, and this acts as a spatial limitation, The cores used to do so will not be available. In other words, the core can not be installed due to the spatial restriction around the rotor, and therefore, the magnet formed by the magnet attached to the rotor does not have a core, and thus is largely lost in the air. Further, according to the eddy current principle, almost no eddy current is generated when the rim rotates at a low speed, and the rotational speed of the rotor itself is greatly reduced. If the power generation efficiency is extremely low, the electromotive force can not be induced at low speed.

Published Japanese Patent Application No. 10-2014-0062463

SUMMARY OF THE INVENTION It is an object of the present invention to provide a generator for a bicycle which can be used for all kinds of rims and has a sufficient power generation efficiency.

In order to achieve the above object, the present invention provides a generator for a bicycle which is provided with a rotatable body usable in all types of rims, and which has a magnet for induction induction and a magnet for power generation separately.

More specifically, the present invention relates to a rotating body for use in a generator (20) installed at a relatively fixed position relative to a rim (10) of a rotating bicycle, the rotating body being disposed adjacent to or in contact with the rim And an eddy current induction magnet 35 is provided along the outer circumferential surface and one end of the rotary shaft 62 of the generator 60 is fixed to the center of the rotary body 30. [

At least a part of the outer circumferential surface of the rotating body 30 may be disposed on the outer side of the outer circumferential surface of the induction magnet 35. [

The side surface of the rotating body 30 may be inclined corresponding to the inclined surface of the rim 10.

A plurality of eddy current induction magnets 35 accommodated in the rotating body 30 may be provided so that the polarities toward the outer peripheral surface of the rotating body 30 are alternately arranged.

The eddy current induction magnet 35 accommodated in the rotating body 30 is inserted into the rotating body 30 from the outside of the rotating body 30 or embedded in the rotating body 30, (30) may cover the outer surface of the eddy current induction magnet (35).

The shape of the magnet accommodating portion 33 formed on the outer periphery of the rotating body 30 to accommodate the eddy current induction magnet 35 and the eddy current induction magnet 35 is angular, It is possible to prevent the magnet from rotating and flowing.

A central body 37 having a relatively high rigidity is provided at the center of the rotating body 30 and a rotating shaft receiving portion A plurality of concave and convex structures are formed on the outer circumferential surface of the central body 37. The central body accommodating portion 31 formed in the center of the rotary body 30 has a shape corresponding to the central body, The corresponding concave-convex structures of the center body and the center body accommodating portion are engaged with each other, so that the center body and the rotating body can be rotated integrally.

The present invention also relates to a generator (20) installed at a relatively fixed position relative to a rim (10) of a rotating bicycle, wherein the generator (20) is disposed adjacent to or in contact with the rim (10) A rotating body (30) provided with the rotor; A rotating shaft (62) having one end fixed to the center of the rotating body (30); And a power generating unit (60) disposed at the other end of the rotating shaft (62).

The power generating unit (60) includes a case (70) installed at a position relatively fixed with respect to the rim (10); A core 66 fixed inside the case 70; A coil 68 wound around the core 66; And a power generating magnet 64 mounted on a rotating shaft disposed in the space surrounded by the core and the coil.

According to another aspect of the present invention, there is provided a method of installing a generator according to the type of a rim of a bicycle, the method comprising the steps of: arranging a generator such that an axis of the rotor and a shaft of the wheel are substantially perpendicular to each other; Disposing the generator so as to face the hub direction, and fixing the generator such that the side surface of the rotor is adjacent to or in contact with the side surface of the rim.

When installed on a bicycle comprising a wheel made of a ferromagnetic material or a rim of a paramagnetic material, the distance between the side surface of the rotating body and the rim may be 1 to 10 mm.

When the bicycle is mounted on a bicycle including a wheel made of a non-metallic rim that does not generate an eddy current, the generator can be fixed such that the upper side of the rotating body and the lower side of the rim are in contact with each other.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to efficiently generate power even when installed on a bicycle using any kind of rim.

That is, in the case of the rim made of the ferromagnetic material, the rotating body can be rotated by the attractive force of the magnet. In the case of the rim made of the paramagnetic body, the rotating body can be rotated using eddy currents generated in the paramagnetic body. In the case of a rim of a material which is not electrically energized, the rotating body can be rotated in a semi-contact manner, so that it is possible to install all of the iron rims, aluminum rims and carbon rims circulating in the market.

Further, according to the present invention, it is possible to solve the problem caused by the rim desorption phenomenon of the magnet generated when the aluminum rim is used.

In addition, according to the present invention, it is possible to prevent the generator from interfering with the wire spoke of the wheel due to the shape of the inclined surface of the rotating body.

Further, according to the present invention, since the rotating body has high impact absorption rate, abrasion resistance and rolling friction coefficient, it can be used both in noncontact type, semi-contact type and contact type, and has a high rigidity center body, There is an advantage.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a perspective view showing a state where a generator of the present invention is installed close to or in contact with a rim of a bicycle,
2 is an exploded perspective view of a rotating body used in the generator of the present invention,
3 is a perspective view of a power generating portion of a generator according to the present invention,
4 is a side view of the generator of the present invention, and
5 is a cross-sectional view taken along the line AA of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to inform.

FIG. 1 is a perspective view showing a state where a generator of the present invention is installed close to or in contact with a rim of a bicycle, FIG. 2 is an exploded perspective view of a rotating body used in the generator of the present invention, Fig. 4 is a side view of the generator of the present invention, and Fig. 5 is a cross-sectional view taken along the line AA of Fig.

[Generator installation type and location]

The generator 20 of the present invention is mounted on the bicycle frame so as to be close to or in contact with the rim 10 of the bicycle wheel as shown in Fig. That is, the generator is fixed on the bicycle frame, and the rim 10 of the bicycle wheel rotates in a state of being adjacent to the generator 20 or in contact with the generator when the bicycle wheel rotates. The generator 20 has a rotating body 30, which will be described later, and a power generating unit 60, which will be described later, disposed at the lower portion of the generator 20.

The rotational axis of the rotating body 30 is substantially perpendicular to the axis of the bicycle wheel. That is, the circumferential direction of rotation of the side surface of the rotating body and the circumferential direction of rotation of the side surface of the rim facing the rotating body coincide with each other.

[Structure and rotation principle of rotating body]

It is the portion of the rotating body 30 of the generator 20 that abuts or contacts the rim 10 of the bicycle wheel. Referring to Fig. 2, the rotating body 30 of the bicycle has a substantially truncated conical shape. That is, the sectional view of the rotating body becomes a trapezoid. However, the side surface of the rotating body does not necessarily have to be the same as the side surface shape of the truncated cone. That is, the present invention does not exclude the formation of irregularities in the circumferential direction or the up-and-down direction on the side surface.

This is because the rim of the bicycle wheel becomes gradually narrower toward the hub, which is the center of the wheel, because the truncated cone is formed to have a trapezoidal cross-sectional shape. That is, as the rim of the wheel is inclined, the side surface of the rotating body facing the rim is inclined so as to correspond to the inclination of the rim, so that the power generation portion 60 provided at the lower portion of the rotating body is installed away from the wire spokes of the bicycle wheel (See FIG. 4).

However, the shape of the rotating body is not necessarily limited thereto, and it may have a cylindrical shape, a polygonal columnar shape, or a polygonal prism shape depending on the shape of the rim and the method of storing the magnet.

It is preferable that the rotating body 30 is made of a synthetic resin material, particularly, it is made of a material having a good impact absorption ratio and a high abrasion resistance and a high rolling friction coefficient. Materials such as tires may be applicable. Silicon series may also be used, although the hardness is weak.

As shown in the figure, an equal-interval magnet accommodating portion 33 is formed radially around the rotating body, and the eddy current induction magnet 35 is accommodated in the magnet accommodating portion 33, respectively. A plurality of eddy current induction magnets 35 are accommodated in the magnet accommodating portion 33 so that N and S poles are alternately arranged in the direction in which each magnet faces the side of the rotator. When the N pole and S pole are arranged alternately, the eddy current is generated in the rim so that the rotating body can rotate well. The magnet may be a neodymium magnet, and it may be constituted of about six to twenty in consideration of various factors such as an installation environment. The eddy current induction magnet 35 may be inserted into the magnet accommodating portion 33 after the rotation body is manufactured or may be integrally inserted into the magnet accommodating portion 33 by an insert injection method. The magnet accommodating portion 33 and the eddy current induction magnet 35 have an angular structure as shown in FIG. 2, so that they are not rotated when they are inserted once and their positions are maintained. In particular, when the magnet accommodating portion 33 and the eddy current induction magnet 35 are formed asymmetrically as shown in the trapezoidal column shape as shown in the drawing, the eddy current induction magnet 35 is hollow in the magnet accommodating portion 33 The phenomenon can be prevented.

A rigid central body 37 is fitted to the rotation center of the rotating body. A central body receiving portion 31 having a shape corresponding to that of the center body 37 is formed at the center of the rotating body 30. The outer surface of the central body 37 and the inner surface of the central body accommodating portion 31 are each provided with concavities and convexities to prevent the rotating body 30 and the center body 37 from loosening. A relatively rigid center body (37) is fitted in the center of rotation of the rotating body to support the rotation of the rotating body which is relatively soft. In the case of constructing a rigid core body at the center of the rotating body rather than when all of the rotating body is made of a soft material, it is possible to greatly reduce the factor of rotation of the rotating body even if the rotating body is elastically deformed.

The rotation center of the center body 37 is formed with a rotation shaft receiving portion 39 in which a rotation shaft 62 to be described later is formed. Therefore, when the rotating body rotates, the central body and the rotating shaft move integrally and rotate.

The rotating body 30 is rotated about the rotating shaft 62. [

According to the present invention, when the rim material of the bicycle wheel is made of iron having a ferromagnetic material, attraction is exerted between the eddy current induction magnet 35 of the rotating body 30 and the rim 10, The eddy current induction magnet is pulled by the attraction force and the rotating body 30 is also rotated to induce rotation of the rotating body. Although the rotating body may come into contact with the rim due to the attractive force of the eddy current induction magnet 35 in the rotating body 30, the surface of the rotating body is made of a material having high abrasion resistance and rolling frictional force It is possible to rotate well together with the rotation of the motor. Therefore, in the case of the generator and rotor structure of the present invention, the generator can be used in non-contact type and / or contact type in the rim made of iron. This is because the energy loss is small as a noncontact type due to the use of the attraction force of the magnet, and even when the surface of the rotating body touches the surface of the rim due to the attraction of the magnet, it is semi-contact type not strong contact, Much less. That is, the work force method can be applied in parallel with the semi-contact method. According to the attraction method, the distance between the rotating body and the rim can be 1 to 10 mm.

When the rim material of the bicycle wheel is made of aluminum, the magnetic flux of the eddy current induction magnet 35 of the rotating body 30 induces an eddy current on the surface of the rim 10 as the rim rotates, The rotating body 30 also rotates in a noncontact manner as the rim 10 rotates by pulling the magneto 35 for inducing eddy current by acting as a magnetic force again. At this time, there may occur a case where the eddy current induction magnet 35 in the rotating body 30 bumps against the rim because a ferromagnetic substance is present at one portion (joint portion) along the circumference of the rim 10, The side surface of the rotating body 30 having the rolling frictional force hits the rim and receives the rotational force of the rim, so that the rotational force of the rotating body is not lost. As a result, the problems occurring in the above-described conventional non-contact type generator are solved at once. Therefore, in the case of the generator and rotor structure of the present invention, the generator can be used in a non-contact manner to a rim made of a paramagnetic material such as aluminum. Since this is a non-contact type, energy loss is much less than conventional full contact generators. According to the eddy current method, the distance between the rotating body and the rim can be 1 to 10 mm.

Also, when the rim material of the bicycle wheel is made of a material such as carbon which is not induce eddy current, the side surface of the rotating body 30 is rotated in semi-contact with the side surface of the rim. At this time, the side surface of the rotating body is set so that the lower side of the rim is in contact with the surface. Therefore, in the generator and rotor structure of the present invention, since the generator can be used semi-contactly with a rim made of a material such as carbon which is not a ferromagnetic material or a paramagnetic material, It is possible to rotate the rotating body in a semi-contact or non-contact manner.

[Structure of Power Generation Section]

Next, the power generating unit 60 of the present invention will be described in detail with reference to FIGS. 3 to 5. FIG.

The rotating shaft 62 fixed to the center of the rotating body 30 extends to the power generating portion 60. The power generation unit 60 includes a case 70 fixed to a frame or the like of a bicycle and a core 66 fixed inside the case 70. [ For example, the case 70 may have a cylindrical shape, and the core in the case may have a cylindrical shape on the outer surface as shown in FIG. A coil 68 is wound around the core 66.

Since the power generation section is driven based on the rotational kinetic energy interlocked by the bicycle, it is necessary to achieve a high output by reducing the size and weight.

The core 66 may have a diameter of about 20 to 50 mm, and the coil bundle may have about 2 to 12 coil bundles. The height of the core is about 20 to 50 mm.

The diameter of the coil 68 is about 0.15 to 0.4 mm. These cases, cores and coils are fixed.

A rotating shaft 62 is disposed in a space surrounded by the core 66 and the coil 68 and rotates. As shown in the figure, the power generating magnet 62 is formed on the rotary shaft 62 and rotates together with the rotation of the rotary shaft. The power generation magnet 62 can be a neodymium magnet, and the number of magnet poles can be set from 2 to 8 poles.

The shape of the generator can consist of single-phase or three-phase depending on the number of magnetic poles and the number of coil bundles.

According to the present invention, the magnet (35) provided in the rotating body and the magnet (64) provided in the rotating shaft (62) for inducing the electromotive force are separately formed in order to induce the eddy current. Since a coil can be installed, a magnetic path is formed, so that the power generation efficiency is superior to that of a conventional non-contact generator.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it can be done. Although the embodiments of the present invention have been described in detail above, the effects of the present invention are not explicitly described and described, but it is needless to say that the effects that can be predicted by the configurations should also be recognized.

10: rim
20: generator
30: rotating body
31:
33: Magnet accommodating portion
35: Eddy current induction magnet
37: centromere
39:
60:
62:
64: Power generating magnet
66: Core
68: Coil
70: Case

Claims (8)

A generator (20) installed at a relatively fixed position relative to a rim (10) of a rotating bicycle,
A rotating body 30 disposed adjacent to or in contact with the rim 10 and having an electromagnetism induction magnet 35 along an outer circumferential surface thereof;
A rotating shaft (62) having one end fixed to the center of the rotating body (30); And
And a power generating unit (60) disposed at the other end of the rotating shaft (62)
At least a part of the outer circumferential surface of the rotating body (30) is disposed on the outer side of the outer circumferential surface of the induction magnet (35)
At least the outer circumferential surface portion of the rotating body disposed on the outer side of the outer circumferential surface of the induction magnet (35)
When contact with the rim, kinetic energy of the rim can be transmitted to the rotating body by friction between the rim and the rim, and when the rim collides with the rim, the eddy current induction magnet 35 is prevented from directly colliding with the rim, And a material which is elastically deformed and absorbs impact energy.
The method according to claim 1,
Wherein a side surface of the rotating body (30) is inclined corresponding to an inclined surface of the rim (10).
The method according to claim 1,
Wherein a plurality of eddy current induction magnets (35) accommodated in the rotating body (30) are provided, and the polarity of the magnets facing the outer peripheral surface of the rotating body (30) is alternately arranged.
The method according to claim 1,
The eddy current induction magnet 35 accommodated in the rotating body 30 is inserted into the rotating body 30 from the outside of the rotating body 30 or embedded in the rotating body 30,
Wherein a side surface of the rotating body (30) is shaped to cover an outer surface of the eddy current induction magnet (35).
The method according to claim 1,
The shape of the magnet accommodating portion 33 formed on the outer periphery of the rotating body 30 to accommodate the eddy current induction magnet 35 and the eddy current induction magnet 35 is angular, Wherein the magnet is prevented from rotating.
The method according to claim 1,
Wherein a central body (37) having a relatively high rigidity is provided at the center of the rotating body (30) and the rotating shaft (62) is fixed to the center of the center body (37).
The method of claim 6,
A plurality of concavo-convex structures are formed on the outer circumferential surface of the central body 37. The central body accommodating portion 31 formed in the center of the rotary body 30 has a shape corresponding to the central body,
Wherein the central body and the rotating body are integrally rotated by engaging the corresponding concave-convex structures of the center body and the center body accommodating portion.
The method of claim 7,
Wherein the core body is made of a polycarbonate material.

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