Power generation system

Abstract

Provided is a power generation system that can generate electricity from a dynamo provided on a bicycle without pedaling. 【Solution means】The power generation system S is a power generation system of a bicycle 1 having a rear wheel 11, left and right cranks 15 for rotating the rear wheel 11, and a dynamo that is adjacent to the rear wheel 11 and generates electricity by the rotation of the rear wheel 11, and includes a blade 4. The blade 4 has a peripheral wall 41, a fixing portion that is fixed to the crank 15 together with the peripheral wall 41 inside the peripheral wall 41 with the center of the peripheral wall and the crankshaft arranged on the same axis, and a plurality of blades 42 extending outward from the peripheral wall 41. In the power generation system S, when the blade 42 receives water flow or wind and the peripheral wall 41 rotates together with the crank 15, the rear wheel 11 is rotated to generate electricity from the dynamo.

Description

Technical Field

[0001] The present invention relates to a power generation system using a bicycle.

Background Art

[0002] Conventionally, a bicycle is equipped with a dynamo (generator) provided on the front wheel, and a front light is lit by the electric power generated by this dynamo. The types of dynamos are roughly divided into rim dynamos and hub dynamos. A rim dynamo is an existing power generation device that has a main body and a shaft extending from the main body. This shaft contacts the rim or the side surface of the tire of the front wheel of the bicycle and rotates when the bicycle travels. The rim dynamo generates electricity by this rotational motion. Also, different from such an old rim dynamo, in recent years, a rim dynamo using overcurrent has also been put on the market. On the other hand, a hub dynamo is a generator incorporated in the axle (hub) of the front wheel. Similar to the rim dynamo, the hub dynamo also generates electric power when the hub rotates during the running of the bicycle. Since the hub dynamo has less resistance compared to the contact-type rim dynamo, it is capable of generating electric power efficiently.

[0003] Also, a non-contact power generation device for a bicycle disclosed in Patent Document 1 is also known. This device is provided with a permanent magnet in which S poles and N poles are arranged by being joined to the core of a power generation coil, and by arranging the S poles and N poles so as to face the spokes of the front wheel or the rear wheel of the bicycle, electricity is generated when the wheel rotates.

[0004] And, devices that utilize the electric power generated by such a dynamo of a bicycle have been developed. For example, the power supply system disclosed in Patent Document 2 includes a charging module electrically connected to a dynamo and the like, and supplies electric power to a mobile phone or a storage battery via a USB connector. Thereby, this power supply system effectively utilizes the electric power generated by the dynamo of the bicycle. Also, such a power supply system can be effectively utilized as a temporary power supply device when a power outage occurs due to a disaster.

[0005] Incidentally, since the power supply system disclosed in Patent Document 2 is a system that generates electricity during running, it is natural that electricity cannot be generated without pedaling. Therefore, although it can be effectively utilized as a short-term power generation system for power outages during disasters, it is insufficient as a power source until restoration when the power outage lasts for a long time.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, the problem to be solved by the present invention is to provide a power generation system that can generate electricity for a dynamo provided on a bicycle without pedaling.

Means for Solving the Problems

[0008] To solve the above problems, the power generation system according to the present invention is a power generation system for a bicycle having a rear wheel, left and right cranks for rotating the rear wheel, and a dynamo that is adjacent to the rear wheel and generates electricity by the rotation of the rear wheel, and includes blades. The blades have a peripheral wall, a fixing portion that is fixed to the crank together with the peripheral wall inside the peripheral wall with the center of the peripheral wall and the crankshaft arranged on the same axis, and a plurality of blades extending outward from the peripheral wall. When the blades receive water flow or wind and the peripheral wall rotates together with the crank, the rear wheel is rotated to generate electricity for the dynamo.

[0009] The above power generation system preferably has a plurality of spoke blades connected to each spoke of the rear wheel, A stand is further provided, which exposes the upper half of the rear wheel above the water surface and positions the lower part of the rear wheel at a height where it is subject to water resistance, and also exposes the upper half of the peripheral wall above the water surface and positions the lower part of the peripheral wall at a height where it is subject to water resistance.

[0010] To solve the above problems, the blade according to the present invention is a blade used in a power generation system of a bicycle having a rear wheel, left and right cranks for rotating the rear wheel, and a dynamo adjacent to the rear wheel and generating electricity by the rotation of the rear wheel, a peripheral wall, a fixing portion fixed to the crank together with the peripheral wall inside the peripheral wall with the center of the peripheral wall and the crankshaft arranged on the same axis, and a plurality of blades extending outward from the peripheral wall. When the blades receive water flow or wind and the peripheral wall rotates together with the crank, the rear wheel is rotated to generate electricity in the dynamo.

[0011] The above blade preferably has a fixing portion including a first holding portion that holds the upper or lower part of the crank from the left - right direction, and a second holding portion that holds the upper or lower part of the crank from the front - rear direction.

[0012] The above blade preferably further includes a crank and a side wall provided with a hole through which a bicycle pedal passes, the peripheral wall protrudes from the side wall, and the fixing portion is fixed to the side wall.

[0013] The above blade preferably has a fixing portion including a vertical plate provided with a plurality of screw holes and surrounding the crank, and a first screw, and the crank is fixed by surrounding the crank with a plurality of vertical plates and pressing the tip of the first screw arranged in the screw holes of the vertical plates.

[0014] The above blade is preferably The fixing part is a support part extending outward in the left - right direction from the vertical plate, a first horizontal plate provided with a plurality of screw holes and fixed to the support part and extending in the horizontal direction, a second horizontal plate provided with a plurality of screw holes, a second screw, and further has The bicycle pedal is fixed by connecting the first horizontal plate and the second horizontal plate with the second screw while sandwiching the pedal between the first horizontal plate and the second horizontal plate.

[0015] In order to solve the above problems, a power generation method according to the present invention is a power generation method for a bicycle having a rear wheel, left and right cranks for rotating the rear wheel, and a dynamo adjacent to the rear wheel and generating power by the rotation of the rear wheel, fixing a blade having a peripheral wall, a fixing part disposed inside the peripheral wall, and a plurality of blades extending outward from the peripheral wall to the crank by the fixing part with the center of the peripheral wall and the crankshaft arranged on the same axis line, including causing the blade to receive water flow or wind and rotate together with the crank to rotate the rear wheel and generate power for the dynamo.

Advantages of the Invention

[0016] The power generation system according to the present invention can generate power for the dynamo provided on the bicycle without pedaling by utilizing water power.

Brief Description of the Drawings

[0017]

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Embodiments for Carrying Out the Invention

[0018] Hereinafter, an embodiment of the power generation system of the present invention and a power generation blade (hereinafter simply referred to as "blade") used in the system will be described with reference to the attached drawings. In the figures, the X-axis indicates the front-rear direction, the Y-axis indicates the left-right direction, and the Z-axis indicates the up-down direction.

[0019] FIG. 1 is a schematic side view showing a power generation system S according to the present embodiment. As shown in FIG. 1, the power generation system S includes a bicycle 1, a blade 4, a first stand 2, and a second stand 3. The first stand 2 and the second stand 3 correspond to the "stand" of the present invention. The power generation system S is configured to function as a power generation system S using a so-called undershot waterwheel. Although only one blade 4 is shown in the attached drawings, it may be composed of two blades and may be arranged on the left and right sides of the bicycle 1.

[0020] <bicycle> The bicycle 1 is a conventional bicycle 1 and includes a front wheel 10, a rear wheel 11, a saddle 12, left and right pedals 13, a handlebar 14, a crank 15, a front gear 16, a rear gear 17, a chain 18, and a dynamo (not shown).

[0021] The crank 15 is connected to the front gear 16, and the rear wheel 11 is connected to the rear gear 17. The front gear 16 and the rear gear 17 are connected by a chain 18. Thus, when the crank 15 rotates, the front gear 16 rotates, and as a result, the rear wheel 11 rotates.

[0022] The dynamo is configured to generate electricity by the rotation of the rear wheel 11 adjacent to the rear wheel 11. The type of the dynamo is not particularly limited. For example, it may be a hub dynamo arranged on the hub of the rear wheel 11, or a rim dynamo arranged adjacent to the rim of the rear wheel 11. In the case of a rim dynamo, it is preferably a dynamo configured to be able to generate electricity in a non-contact manner with respect to the rim so that the power generation efficiency does not decrease even if the rim is wet with water. Also, the dynamo may be of a type that generates electricity by contacting the tire of the rear wheel 11. The bicycle 1 according to the present embodiment only needs to be provided with a dynamo that generates electricity when the rear wheel 11 rotates, and no particular modification for power generation is required.

[0023] <blade> As shown in Fig. 1, the blade 4 includes a side wall 40, a peripheral wall 41, and a plurality of blades 42, and is fixed to the crank 15. The number of the blades 42 is not particularly limited. The material of the blade 4 may be plastic or a rust-proof metal such as aluminum or stainless steel.

[0024] Fig. 2 is a schematic perspective view showing an image of the attachment of the blade 4, and Fig. 3 is a schematic side view showing the blade 4. As shown in Figs. 2 and 3, the peripheral wall 41 protrudes from the side wall 40, and each blade 42 extends outward from the peripheral wall 41. As shown in Fig. 3, a crank hole 40a for passing the crank 15 is provided in the side wall 40. A mark 40b is provided on the side wall 40 to facilitate aligning the crankshaft 150 and the center of the peripheral wall 41 on the same axis. As shown in Fig. 2, the blade 4 is fixed to the crank 15 with the center of the peripheral wall 41 and the crankshaft 150 arranged on the same axis.

[0025] As shown in Figs. 3 to 5, the blade 4 further includes a first holding portion 43 and a second holding portion 44. In the present embodiment, the "fixing portion" of the present invention is constituted by the first holding portion 43 and the second holding portion 44.

[0026] As shown in Fig. 4, the first holding portion 43 has a first support plate 430, two first bolts 431, and two first pressing plates 432.

[0027] The first support plate 430 is fixed to the side wall 40 and is formed in a U shape in plan view. However, the shape of the first support plate 430 is merely an example and is not limited thereto. Also, the first support plate 430 may be fixed to the peripheral wall 41. Female threads for the first bolts 431 are provided before and after the first support plate 430, respectively.

[0028] The two first bolts 431 are respectively arranged before and after the first support plate 430. The first bolt 431 is composed of a so-called adjustment bolt and has a pivoting mechanism, and the first pressing plate 432 is connected to the first bolt 431 in an angle-changeable manner. The first pressing plate 432 is formed in an arc-shaped cross section so as to easily hold the crank 15, but this is merely an example and it may be formed in a flat plate shape. Also, on the pressing side of the first pressing plate 432, an elastic material such as rubber (not shown) is arranged so as to easily hold the crank 15.

[0029] As shown in FIG. 6, the first holding portion 43 presses the first pressing plate 432 against the crank 15 from the front and back of the crank 15 and holds the crank 15 by adjusting the distance between the front and back first pressing plates 432 by the front and back first bolts 431.

[0030] As shown in FIG. 5, the second holding portion 44 includes a second support plate 440, three second bolts 441, and left and right second pressing plates 442.

[0031] The second support plate 440 is fixed to the side wall 40 and is formed in a U shape in plan view. However, the shape of the second support plate 440 is also merely an example and is not limited thereto. Also, the second support plate 440 may be fixed to the peripheral wall 41. Three female threads for the second bolts 441 are provided on the outer wall of the second support plate 440.

[0032] The three second bolts 441 are both arranged on the outer wall of the second support plate 440. The second bolts 441 are composed of so-called adjustment bolts and have a swing mechanism, and the left and right second pressing plates 442 are respectively connected to the second bolts 441 in an angle-changeable manner. Note that at least the inner second pressing plate 442 is configured to be removable so that the pedal 13 and the crank 15 can pass through. The left and right second pressing plates 442 are formed in an arcuate cross-section to easily hold the crank 15, but this is merely an example and they may be formed in a flat plate shape. Also, an elastic material such as rubber (not shown) is arranged on the pressing side of the second pressing plate 442 to easily hold the crank 15.

[0033] As shown in FIG. 6, the second holding portion 44 adjusts the distance between the left and right second pressing plates 442 by the second bolts 441, presses the second pressing plates 442 against the crank 15 from the left and right of the crank 15, and holds the crank 15.

[0034] As shown in FIG. 7, the blade 4 is formed in a barrel shape by the side wall 40 and the peripheral wall 41, and the first holding portion 43 and the second holding portion 44 are arranged inside thereof. With the above configuration, the blade 4 enables the rotation of the crank 15 and is firmly fixed to the crank 15.

[0035] <Fixing method> Once again, the fixing method of the blade 4 will be described. First, the blade 4 is passed through the crank 15 from the crank hole 40a of the peripheral wall 41, and the crank 15 is arranged inside the peripheral wall 41. Next, with the center of the peripheral wall 41 and the crank axis 150 arranged on the same axis, the blade 4 is fixed to the crank 15 by the first holding portion 43 and the second holding portion 44.

[0036] <Stand> As shown in FIG. 1, the first stand 2 and the second stand 3 are respectively arranged on the front wheel 10 and the rear wheel 11, and separate the bicycle 1 from the ground. Thereby, the attachment of the blade 4 can be facilitated.

[0037] <Power generation method> As shown in FIG. 8, the first and second stands 2 and 3 expose the upper half of the blade 4 above the water surface and set the height of the lower blades 42 of the blade 4 to receive the resistance of the water. As a result, the blade 4 rotates together with the crank 15 under the resistance of the water flowing from the front to the rear. As a result, the rear wheel 11 can be rotated to generate electricity in the dynamo. Further, when the bicycle 1 is a bicycle with a gear shift, by changing the gear, the weight for rotating the rear wheel 11 can be changed to an appropriate weight according to the strength of the water flow.

[0038] As described above, in the power generation system S, the rear wheel 11 rotates due to the water flow, so that the dynamo can generate electricity. Therefore, the power generation system S can be effectively utilized as a temporary power supply for a long time even when a power outage occurs due to a disaster.

[0039] As described above, the power generation system S and the blade 4 according to an embodiment of the present invention have been described. However, the present invention is not limited to the above embodiment. For example, the present invention may be implemented by the following modification examples, or may be implemented by appropriately combining the following modification examples.

[0040] <Modification example> · FIGS. 9 to 11 are schematic views showing a bracket 45 according to a modification example of the blade 4. As shown in FIGS. 9 to 11, the blade 4 may have a fixing portion constituted by a bracket 45. In this case, the fixing portion includes a first vertical plate 451, a second vertical plate 452, a shaft rod 453, a first screw 454, a first horizontal plate 455, a second horizontal plate 456, and a second screw 457. The first vertical plate 451 and the second vertical plate 452 correspond to the "vertical plates" of the present invention.

[0041] The first and second vertical plates 451 and 452 have a plurality of screw holes (female threads) for the first screw 454. The first screw 454 is disposed in the screw holes of the first and second vertical plates 451 and 452. The first screw 454 may be, for example, an adjustment bolt having a pressing portion at its tip, or the tip may be configured to be swingable. The first vertical plate 451 and the second vertical plate 452 are connected to or integrally formed with each other, and form a U shape in plan view as shown in FIGS. 9 and 10C. And the bracket 45 surrounds the crank 15 by the first and second vertical plates 451 and 452, and fixes the crank 15 by pressing the tip of each first screw 454 against the crank 15. The first and second vertical plates 451 and 452 can correspond to the difference in the length of the crank 15 for each bicycle 1 by having a plurality of screw holes vertically. The number of upper and lower screw holes of the first and second vertical plates 451 and 452 is not particularly limited.

[0042] As shown in FIGS. 9 and 10A, the first vertical plate 451 is formed in a trapezoidal shape and extends outward in the left - right direction toward the lower part. Among the portions of the first vertical plate 451, the portion protruding from the second vertical plate 452 corresponds to the "support portion" of the present invention.

[0043] The first and second horizontal plates 455 and 456 have a plurality of screw holes (female threads) for the second screw 457. The second screw 457 is disposed in the screw holes of the first and second horizontal plates 455 and 456. The first horizontal plate 455 is connected to or integrally formed with the support portion of the first vertical plate 451 and extends horizontally in the front - rear direction from the lower surface of the support portion. The bracket 45 fixes the pedal 13 by tightening the second screw 457 while sandwiching the pedal 13 between the first horizontal plate 455 and the second horizontal plate 456.

[0044] The shaft bar 453 extends outward in the left - right direction from the second vertical plate 452. The bracket 45 may have, for example, a plurality of shaft bars 453 vertically.

[0045] As shown in FIG. 11, when the fixing portion is constituted by the bracket 45, the side wall 40 has a bracket hole 40c and a shaft hole 40d instead of the crank hole 40a. The bracket hole 40c is composed of a slit extending vertically with a width slightly wider than that of the support portion (the first vertical plate 451) so that the support portion can be inserted, and a rectangular hole through which the pedal 13 and the support portion pass. The shaft hole 40d is composed of a slit extending vertically with a width slightly wider than that of the shaft 453. Thereby, the front and rear support portions, the first and second horizontal plates 455 and 456, and the pedal 13 are passed through the bracket hole 40c, and the shaft 453 is passed through the shaft hole 40d.

[0046] <Fixing method> Next, the fixing method of the blade 4 of the above modification will be described. (1) Place the first horizontal plate 455 on the upper surface of the pedal 13, and then tighten the second screw 457 with the second horizontal plate 456 placed on the lower surface of the pedal 13 to fix the pedal 13.

[0047] (2) Next, by pressing the tip of each first screw 454 against the crank 15 inside the first and second vertical plates 451 and 452, the crank 15 is fixed to the first and second vertical plates 451 and 452.

[0048] (3) Next, insert the front and rear support portions and the pedal 13 into the bracket hole 40c of the side wall 40, and insert the shaft 453 into the shaft hole 40d. Thereby, the center in the front-rear direction (X-axis direction) of the side wall 40 and the center in the front-rear direction of the crankshaft 150 are positioned. Further, since the upper surface of the support portion is inclined and the shaft hole 40d extends vertically, by sliding the side wall 40 in the left-right direction (Y-axis direction), the vertical center position of the bracket 45, that is, the crankshaft 150 and the side wall 40 can be adjusted.

[0049] In the power generation system S, also in the above-described modification, similar to the above-described embodiment, the blade 4 receives the resistance of the water flowing from the front to the rear and rotates together with the crank 15. As a result, the rear wheel 11 can be rotated to generate electricity in the dynamo. Further, the blade 4 can strengthen the connection between the bracket 45 and the side wall 40 by having a plurality of shaft rods 453 in the bracket 45.

[0050] · FIG. 12 is a schematic side view showing the blade 4 of the power generation system S according to another modification. As shown in FIG. 12, the blade 42 may be composed of a blade 42 for a windmill. In this case, the power generation system S functions as a wind power generation system. Specifically, the power generation system S installs the bicycle 1 with the blade 4 fixed so that the blade 4 faces the wind. Then, the wind causes the crank 15 to rotate together with the blade 4, thereby rotating the rear wheel 11 and generating electricity in the dynamo. In this case, the bases of the first and second stands 2 and 3 may be configured to be wide in the left-right direction so that the bicycle 1 does not fall over.

[0051] · FIG. 13 is a schematic view showing still another modification. The power generation system S may further include a plurality of spoke blades 6 disposed on the spokes 112 of the rear wheel 11 to receive the water flow and rotate the rear wheel 11. In this case, for example, as shown in FIG. 13A, the spoke blade 6 has a holding portion 60, a first plate member 61, a second plate member 62, and a fixing portion (not shown). The materials of the holding portion 60, the first plate member 61, and the second plate member 62 may be, for example, plastic or a rust-resistant metal such as aluminum or stainless steel. Also, although the holding portion 60, the first plate member 61, and the second plate member 62 are integrally formed, this is merely an example, and they may be formed separately.

[0052] The holding portion 60 is formed with a slit in the cylinder and is formed in a substantially C-shaped cross-section. The length of the holding portion 60 in the longitudinal direction is configured to be shorter than the length of the spoke 112. The slit is passed through the spoke 112, and the hollow portion of the cylinder is arranged with the spoke 112. The slit of the holding portion 60 is configured to be able to be reduced or closed when the holding portion 60 bends. Thereby, the holding portion 60 can hold the spoke blade 6 on the spoke 112.

[0053] The first plate member 61 extends radially outward from the longitudinal direction of the holding portion 60. In the present embodiment, the first plate member 61 is composed of three, but this is merely an example and is not limited thereto. For example, the first plate member 61 may be composed of four or more.

[0054] The length of the first plate member 61 in the short direction is configured to be a length that does not contact the front fork, fender parts, etc. of the bicycle 1 when the rear wheel 11 rotates. The length of the first plate member 61 in the short direction does not have to be uniform along the longitudinal direction. For example, the length of the first plate member 61 in the short direction may be configured to be shorter the closer it is to the hub of the rear wheel 11 and longer the closer it is to the tire of the rear wheel 11. Further, the length of the first plate member 61 in the longitudinal direction may be, for example, 1 / 5 or more and 1 / 2 or less of the length of the spoke 112.

[0055] The two second plate members 62 extend outward from the longitudinal ends of the slit respectively. And the two second plate members 62 constitute a guide portion that guides the spoke 112 to the hollow portion by their inner surfaces. As shown in FIG. 13A, when the two second plate members 62 pass the spoke 112 to the holding portion 60 through the guide portion in the direction of the arrow, they are fixed to each other by the fixing portion in a superposed state.

[0056] The fixing part is constituted by, for example, a hook-and-loop fastener, a screw, a clip, or a rubber ring. When the fixing part is constituted by a hook-and-loop fastener, it is constituted by a male hook-and-loop fastener provided on the inner surface of one of the second plate members 62 and a female hook-and-loop fastener provided on the inner surface of the other second plate member. In this case, the sizes and numbers of the male hook-and-loop fastener and the female hook-and-loop fastener are not particularly limited.

[0057] When the fixing part is constituted by a plurality of screws, the two second plate members 62 have a plurality of screw holes and are fixed by the plurality of screws in a superposed state. When the fixing part is constituted by a clip, the two second plate members 62 are fixed by one or a plurality of clips in a superposed state. When the fixing part is constituted by a rubber ring, the two second plate members 62 are fixed by winding one or a plurality of rubber rings in a superposed state.

[0058] FIG. 13B shows an example where the spoke blades 6 are held by all the spokes 112, but it is merely an example. The number of blades 4 may be, for example, 6 to 12, etc., and it is not necessary for the spoke blades 6 to be arranged on all the spokes 112.

[0059] As shown in FIG. 14, the power generation system S uses the first and second stands 2 and 3 to expose the upper half of the rear wheel 11 of the bicycle 1 on which the spoke blades 6 are held above the water surface and to set the height of the spoke blades 6 at the lower part of the rear wheel 11 to receive the resistance of the water. Thereby, since the spoke blades 6 receive the resistance of the water flowing from the front to the rear and rotate the rear wheel 11, the power generation system S can rotate the rear wheel 11 more appropriately not only by the rotational force of the blades 4 but also by the rotational force of the spoke blades 6 and can generate electricity efficiently.

Explanation of Reference Numerals

[0060] S Power generation system 1 Bicycle 10 Front wheel 11 Rear wheel 112 Spoke 12 Saddle 13 Pedal 14 Handle 15 Crank 150 Crankshaft 16 Front gear 17 Rear gear 18 Chain 2 First stand 3 Second stand 4 Blade 40 Side wall 40a Crank hole 40b Mark 40c Bracket hole 40d Shaft hole 41 Peripheral wall 42 Blade 43 First holding part 430 First support plate 431 First bolt 432 First pressing plate 44 Second holding part 440 Second support plate 441 Second bolt 442 Second pressing plate 45 Bracket (fixing part) 451 First vertical plate 452 Second vertical plate 453 Shaft 454 First screw 455 First horizontal plate 456 Second horizontal plate 457 Second screw 6 Spoke blade 60 Holding part 61 First plate member 62 Second plate member

Claims

1. A power generation system for a bicycle, comprising a rear wheel, left and right cranks for rotating the rear wheel, and a dynamo adjacent to the rear wheel and generating electricity by the rotation of the rear wheel, comprising blades, wherein the blades comprise a peripheral wall, a fixing part fixed to the crank together with the peripheral wall inside the peripheral wall with the center of the peripheral wall and the crankshaft arranged on the same axis, and a plurality of blades extending outward from the peripheral wall, and a power generation system in which the peripheral wall rotates together with the crank by the blades receiving water flow or wind, thereby rotating the rear wheel to generate electricity for the dynamo.

2. a plurality of spoke blades connected to each spoke of the rear wheel, and a stand that exposes the upper half of the rear wheel above the water surface and makes the lower part of the rear wheel receive water resistance, and also exposes the upper half of the peripheral wall above the water surface and makes the lower part of the peripheral wall receive water resistance, the power generation system according to claim 1.

3. A blade used in a power generation system for a bicycle, comprising a rear wheel, left and right cranks for rotating the rear wheel, and a dynamo adjacent to the rear wheel and generating electricity by the rotation of the rear wheel, comprising a peripheral wall, a fixing part fixed to the crank together with the peripheral wall inside the peripheral wall with the center of the peripheral wall and the crankshaft arranged on the same axis, and a plurality of blades extending outward from the peripheral wall, and a blade in which the peripheral wall rotates together with the crank by the blades receiving water flow or wind, thereby rotating the rear wheel to generate electricity for the dynamo.

4. The fixing part comprises a first holding part that holds the upper or lower part of the crank in the left - right direction, and a second holding part that holds the upper or lower part of the crank in the front - rear direction, the blade according to claim 3.

5. further comprising the crank and a side wall provided with a hole through which the pedal of the bicycle passes, wherein the peripheral wall protrudes from the side wall, and the fixing part is fixed to the side wall, the blade according to claim 3.

6. The fixing part comprises a vertical plate provided with a plurality of screw holes and surrounding the crank, and a first screw, and the blade according to claim 3, wherein the crank is surrounded by a plurality of the vertical plates and fixed by pressing the tip of the first screw arranged in the screw holes of the vertical plates against the crank.

7. The fixing part is a support part extending outward in the left - right direction from the vertical plate, a first horizontal plate provided with a plurality of screw holes and fixed to the support part and extending in the horizontal direction, a second horizontal plate provided with a plurality of screw holes, and a second screw, and further has fixing the pedal of the bicycle by connecting the first horizontal plate and the second horizontal plate with the second screw while sandwiching the pedal of the bicycle between the first horizontal plate and the second horizontal plate. The blade according to claim 6.

8. A power - generation method for a bicycle having a rear wheel, left and right cranks for rotating the rear wheel, and a dynamo adjacent to the rear wheel and generating electricity by the rotation of the rear wheel, fixing a blade having a peripheral wall, a fixing part disposed inside the peripheral wall, and a plurality of blades extending outward from the peripheral wall to the crank by the fixing part with the center of the peripheral wall and the crankshaft arranged on the same axis; including causing water flow or wind to act on the blade to rotate it together with the crank, thereby rotating the rear wheel to generate electricity by the dynamo.

Images