Bicycle driving device for reducing drive axle load

Abstract

The present invention provides a bicycle driving device for reducing a drive axle load, in which a bicycle wheel frame and a drive axle are integrally formed, main gears are integrally provided at both ends of the drive axle, and sub-gears are provided on both sides of the main gear. Thus, in a section driven by the power of a user pedaling, unlike the prior art, the wheel frame and the drive axle are integrated, and at the same time, the load concentrated onto the drive axle is distributed via the sub-gears, by providing the main gears at both ends of the drive axle and the sub-gears engaged with both sides of the main gear, so as to reduce the load applied to the bearing of the drive axle, thereby facilitating operation of the bicycle. In addition, the rotational force and durability of the wheel can be improved so as to increase the propulsion of the bicycle, and rollability can be improved so as to maintain the stability of the user's driving force, thereby enabling smoother bicycle riding.

Description

Bicycle drive system that reduces drive shaft load

[0001] The present invention relates to a bicycle drive system that reduces the load on the drive shaft, wherein the bicycle wheel frame and the drive shaft are integrally formed, and a main gear is integrally provided at each end of the drive shaft, and sub-gears are provided on both sides of the main gear. Unlike conventional systems, the load concentrated on the drive shaft is distributed through the sub-gears provided by the integration of the wheel frame and the drive shaft and the provision of main gears at both ends of the drive shaft and sub-gears meshing with the main gears on both sides, thereby reducing the load applied to the bearings of the drive shaft, making bicycle driving easier, improving the rotational force and durability of the wheel, enhancing the propulsion of the bicycle, and maintaining the stability of the user's driving force, resulting in improved rolling performance and enabling smoother bicycle operation.

[0002] Bicycles have long been a means of transportation. As energy resources gradually become depleted, there are signs that a bicycle boom is on the horizon. Furthermore, bicycles have long remained popular not only because they are eco-friendly and do not consume energy, but also because they offer health benefits through exercise.

[0003] In addition, various styles of bicycles, such as hiking bikes, mountain bikes, and racing bikes, have been developed to suit diverse uses.

[0004] In bicycles, the hub is a power transmission structure that functions to transmit chain power to the wheels and is composed of the most precise and complex structure. The hub assembly is largely composed of the frame, an adapter to which the chain sprocket is mounted, a racer to which this adapter is connected, and a hub axle. When a load is applied to the bicycle pedals, power is transmitted to the chain sprocket via the chain, and then transmitted to the frame where the wheels are mounted through the adapter and racer, which are connected via a one-way clutch system.

[0005] However, conventional bicycle hubs as described above had drawbacks, such as reduced rotational force and increased friction caused by the load and impact being concentrated on the surrounding ball bearings through the axle member fitted in the center of the hub, which required significant effort to drive the bicycle; additionally, prolonged use resulted in severe wear of internal parts due to contact rotation, reduced durability, and problems with power transmission.

[0006] Meanwhile, the wheel is structured such that the wheel frame rotates around the wheel center axis by means of the aforementioned power transmission structure to drive it, and the problems arising from such a structure are,

[0007] First, there was a problem with the relative decrease in the rotational force of the wheel; second, the inconvenience of replacing bearings due to long-term use; and third, the problem with the relative instability of the wheel's rotational force.

[0008] [Prior Art Literature]

[0009] [Patent Literature]

[0010] (Patent Document 0001) Republic of Korea Patent Registration No. 10-1794517

[0011] (Patent Document 0002) Republic of Korea Patent Registration No. 10-1812105

[0012] (Patent Document 0003) Republic of Korea Patent Publication No. 10-2015-0109299

[0013] (Patent Document 0004) Republic of Korea Patent Registration No. 10-1756475

[0014] Accordingly, the present invention is intended to solve the above-mentioned problems,

[0015] First, the purpose of the bicycle drive device for reducing drive shaft load according to the present invention is to integrate the bicycle wheel frame and the drive shaft so that the range driven by the power driving the user's pedals can be driven simultaneously, unlike conventional methods.

[0016] In addition, the purpose of the bicycle drive device for reducing drive shaft load according to the present invention is to make driving the bicycle easier by reducing the load applied to the bearings of the drive shaft through the sub-gear, by having a main gear integrally provided at each end of the drive shaft and sub-gears provided on both sides of the main gear, thereby distributing the load concentrated on the drive shaft when the user pedals by providing the sub-gears that mesh with the main gears integrally provided at both ends of the drive shaft.

[0017] In addition, the purpose of the bicycle drive device for reducing drive shaft load according to the present invention is to enable smoother bicycle operation by improving rolling performance, thereby enhancing the rotational force and durability of the wheel, increasing the propulsion of the bicycle, and maintaining the stability of the user's driving force, by integrally configuring the wheel frame and the drive shaft and simultaneously equipping it with a sub-gear.

[0018] Next, the purpose of the bicycle drive device for reducing drive shaft load according to the present invention is to improve the convenience and durability of replacing parts such as bearings due to long-term use of the bicycle.

[0019] Specific means for achieving the above-mentioned purpose are,

[0020] A wheel frame (H) having a tube detachably provided on its outer surface; a drive shaft (10) integrally fastened to the center of the wheel frame (H), having disc-shaped anti-slip plates (100) integrally provided on both sides at predetermined intervals in a rod shape, with fixing holes (101) drilled at predetermined intervals in the anti-slip plates (100) to allow a spot (S) to be fixedly coupled, having a main gear (110) integrally provided at both ends, and a screw portion (120) formed near the rear of the main gear (110); a main housing (20) provided on the outer side between the anti-slip plates (100) and the main gear (110), having a bearing portion (200) on its inner circumference, and fixed to the bicycle body by a main body connecting portion (C); and a member coupled to the screw portion (120) to fixly coupled the drive shaft (10) and the main housing (20). A bicycle drive device for reducing drive shaft load comprising: a fixed fastening member (30); a sub-housing (40) equipped with a sub-gear (400) capable of meshing with both sides of the main gear (110); and a finishing member (50) coupled to one side of the outer circumference of the main housing (20); and

[0021] The above main housing (20) is,

[0022] A first housing (210) having a first coupling hole (211) formed at a predetermined interval on the outer edge, a first through hole (212) drilled in the center through which the drive shaft (10) is coupled, a first seating groove (213) formed on the outer periphery of the first through hole (212) for which the bearing part (200) is seated and coupled, and fastening through tubes (215) formed on both sides of the first seating groove (213) with fastening screw parts (214) provided on the inner surface; a second housing (220) having a second coupling hole (221) formed at a predetermined interval on the outer edge, a second through hole (222) drilled in the center through which the drive shaft (10) is coupled, and a second seating groove (223) formed on the outer periphery of the second through hole (222) for which the bearing part (200) is seated and coupled; A bicycle drive device for reducing drive shaft load, comprising fastening the first coupling hole (211) and the second coupling hole (221) with a bolt (V), and

[0023] The above bearing part (200) is,

[0024] A bicycle drive device for reducing drive shaft load, comprising an outer ring body (202) and an inner ring body (203) integrally formed, wherein the outer ring body (202) and the inner ring body (203) are provided on the inner side of the first seating groove (213) and the second seating groove (223), and the outer ring body (202) has a bearing (B) on the inner side and a ring (201) is provided on the front and rear respectively.

[0025] The above sub-housing (40) is,

[0026] A bicycle drive device for reducing drive shaft load, comprising: a fixed shaft (410) having a connecting screw portion (411) formed on the outer surface of each end for a predetermined length; a fixing nut (420) connected to one of the connecting screw portions (411); and a sub-gear (400) connected to the rear of the fixing nut (410) and having a bearing (B) on the inside; and

[0027] The above objective can be achieved by having a bicycle drive device that reduces drive shaft load as a constituent feature, comprising applying a coating agent composed of a liquid mixture of 16% by weight ethanol, 8% by weight ethyl silicate, 11% by weight aluminum oxide, 15% by weight isopropyl alcohol, 15% by weight silica hydrate, 12% by weight mica, 14% by weight triethoxymethylsilane, and 9% by weight dihydrogen oxide to the outer surface of the main housing (20), the finishing part (50), and the drive shaft (10).

[0028] The present invention configured as described above is,

[0029] By integrating the bicycle wheel frame and drive shaft, the range driven by the power of the user's pedals can be driven simultaneously, unlike conventional designs. Main gears are integrally provided at both ends of the drive shaft, and sub-gears are provided on both sides of the main gears. This distributes the load concentrated on the drive shaft when the user pedals through the sub-gears, thereby reducing the load applied to the drive shaft's bearings and making bicycle operation easier. Furthermore, by integrating the wheel frame and drive shaft and providing sub-gears, the bicycle is driven more smoothly through improved rolling performance, which enhances wheel rotation and durability, increases propulsion, and maintains the stability of the user's driving force, thereby enabling smoother bicycle operation. Additionally, it improves the convenience and durability of parts such as bearings for long-term use.

[0030] Although the present invention has been illustrated and described above with reference to specific preferred embodiments, the present invention is not limited to the above-mentioned embodiments, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the invention.

[0031] FIG. 1 is an overall schematic diagram of a bicycle drive system that reduces drive shaft load according to the present invention.

[0032] FIG. 2 is an exploded perspective view of a bicycle drive device that reduces the drive shaft load according to the present invention.

[0033] FIG. 3 is an exploded perspective view of a key part of a bicycle drive device for reducing drive shaft load according to the present invention.

[0034] FIG. 4 is an exploded perspective view of a key part of a bicycle drive device for reducing drive shaft load according to the present invention.

[0035] FIG. 5 is an exploded perspective view of the main housing in a bicycle drive device that reduces the drive shaft load according to the present invention.

[0036] FIG. 6 is a cross-sectional view of the connection of the main housing in a bicycle drive device that reduces the drive shaft load according to the present invention.

[0037] FIG. 7 is an exploded perspective view of a sub-housing in a bicycle drive device that reduces drive shaft load according to the present invention.

[0038] FIG. 8 is a cross-sectional view of the connection of a sub-housing in a bicycle drive device that reduces the drive shaft load according to the present invention.

[0039] FIG. 9 is an overall cross-sectional view of a bicycle drive device that reduces the drive shaft load according to the present invention,

[0040] FIG. 10 is a summary diagram of the state in which a sub-gear is engaged with a main gear in a bicycle drive device that reduces the drive shaft load according to the present invention.

[0041] Explanation of the main symbols in the drawing

[0042] 10 : Drive shaft 20 : Main housing

[0043] 30 : Fixed fastener 40 : Sub-housing

[0044] 50 : Finishing part 100 : Anti-slip plate

[0045] 101 : Fixed hole 110 : Main gear

[0046] 120 : Screw section 200 : Bearing section

[0047] 201 : Ring 202 : Outer ring body

[0048] 203 : Inner ring body 210 : First housing

[0049] 211: First connecting hole 212: First through hole

[0050] 213: First seating groove 214: Fastening screw part

[0051] 215 : Fastening penetration pipe 220 : Second housing

[0052] 221 : Second connecting hole 222 : Second through hole

[0053] 223 : Second mounting groove 400 : Subgear

[0054] 410 : Fixed shaft 411 : Connecting screw part

[0055] 420 : Fixing nut B : Bearing

[0056] C: Main body connection H: Wheel frame

[0057] S : Spoke V : Bolt

[0058] A bicycle drive device that reduces the drive shaft load according to the present invention is,

[0059] A wheel frame (H) having a tube detachably provided on its outer surface; a drive shaft (10) integrally fastened to the center of the wheel frame (H), having disc-shaped anti-slip plates (100) integrally provided on both sides at predetermined intervals in a rod shape, with fixing holes (101) drilled at predetermined intervals in the anti-slip plates (100) to allow a spot (S) to be fixedly coupled, having a main gear (110) integrally provided at both ends, and a screw portion (120) formed near the rear of the main gear (110); a main housing (20) provided on the outer side between the anti-slip plates (100) and the main gear (110), having a bearing portion (200) on its inner circumference, and fixed to the bicycle body by a main body connecting portion (C); and a fixing fastener (30) coupled to the screw portion (120) to fixly coupled the drive shaft (10) and the main housing (20). The invention is characterized by comprising: a sub-housing (40) having a sub-gear (400) provided to be meshable with both sides of the main gear (110); and a finishing part (50) coupled to one side of the outer circumference of the main housing (20).

[0060] Hereinafter, the bicycle drive device for reducing the drive shaft load according to the present invention will be described in detail with reference to the drawings.

[0061] FIG. 1 is an overall schematic diagram of a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 2 is an exploded perspective view of a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 3 is an exploded perspective view of a key part of a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 4 is an exploded perspective view of a key part of a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 5 is an exploded perspective view of a main housing in a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 6 is an assembled cross-sectional view of a main housing in a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 7 is an exploded perspective view of a sub-housing in a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 8 is an assembled cross-sectional view of a sub-housing in a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 9 is an overall cross-sectional view of a bicycle drive system for reducing drive shaft load according to the present invention; FIG. 10 is a bicycle for reducing drive shaft load according to the present invention This is a summary diagram of the state in which the sub-gear is engaged with the main gear in the drive unit.

[0062] As shown in the drawings, the core of the present invention consists of two main parts:

[0063] First, unlike conventional technology, the drive shaft (10) connected to the center of the wheel frame (H) is driven as a single unit with respect to the drive shaft (10) and the wheel frame (H) when the bicycle is driven. A main housing (20) is provided on each side relative to the drive shaft (10), and other components are configured identically on both sides relative to the drive shaft (10). By maintaining a simultaneous driving operation relationship between the drive shaft (10) and the wheel frame (H), the rotational force of the wheel is enhanced, thereby increasing the propulsion force of the bicycle and maintaining the stability of the user's driving force, allowing the bicycle to be ridden for a long time. Furthermore, the convenience of replacing parts such as bearings due to long-term use of the bicycle and durability are improved, and the wheel frame has relative stability and improved durability.

[0064] Secondly, a main gear (110) is integrally provided at each end of the drive shaft (10), and sub-gears (400) are provided on both sides of the main gear (110). This allows the load concentrated on the drive shaft (10) to be distributed through the sub-gears (400) that mesh with the main gear (110), thereby reducing the load applied to the bearings of the drive shaft (10) and making it easier to drive the bicycle. It also improves the rotational force and durability of the wheels, thereby increasing the propulsion force of the bicycle and maintaining the stability of the user's driving force, and thus enables smoother bicycle operation.

[0065] To explain in detail,

[0066] First, in a bicycle equipped with a wheel frame (H) having a tube detachably provided on its outer surface as shown in FIG. 1, the reference numeral 10 indicates a drive shaft, and as shown in FIG. 2 and FIG. 3, the drive shaft (10) is integrally fastened to the center of the wheel frame (H) and has a rod shape with disc-shaped anti-slip plates (100) integrally provided on both sides at a predetermined interval, and fixing holes (101) are drilled at a certain interval in the anti-slip plates (100) so that a spot (S) can be fixedly coupled, and a main gear (110) is integrally provided at both ends, and a screw portion (120) is formed near the rear of the main gear (110).

[0067] Reference numeral 20 indicates a main housing, and as shown in FIGS. 5 and 6, the main housing (20) is provided on the outer side between the anti-slip plate (100) and the main gear (110), has a bearing part (200) on its inner circumference, and is fixed to the bicycle body by a main body connecting part (C). Specifically, the main housing (20) has a first coupling hole (211) formed at a predetermined interval on the outer circumference of the main housing (20), a first through hole (212) through which the drive shaft (10) passes and is coupled is drilled in the center, a first seating groove (213) into which the bearing part (200) is seated and coupled is formed on the outer circumference of the first through hole (212), and a fastening through tube (215) having a fastening screw part (214) on its inner circumference is formed on both sides of the first seating groove (213). A first housing (210); a second housing (220) having a second coupling hole (221) formed at a predetermined interval on the outer edge, a second through hole (222) drilled in the center through which the drive shaft (10) is connected, and a second seating groove (223) formed on the outer periphery of the second through hole (222) through which the bearing part (200) is seated and connected; and the first coupling hole (211) and the second coupling hole (221) are fastened together with a bolt (V).

[0068] Meanwhile, the bolt (V) is joined by the bolt (V) such that the fastening hole (500) of the finishing part (50) shown in FIG. 2 and the first coupling hole (211) and the second coupling hole (221) shown in FIG. 8 are aligned.

[0069] In addition, as shown in FIGS. 5 and 6, the bearing portion (200) is,

[0070] An outer ring body (202) and an inner ring body (203) are integrally formed, wherein the outer ring body (202) is provided on the inner side of the first seating groove (213) and the second seating groove (223), and a bearing (B) is provided on the inner side and a ring (201) is provided on the front and rear sides, respectively.

[0071] Next, the reference numeral 30 indicates a fixed fastener, and as shown in FIGS. 3 and 6, the fixed fastener (30) is coupled to the screw portion (120) to securely connect the drive shaft (10) and the main housing (20).

[0072] Reference numeral 40 indicates a sub-housing, wherein the sub-housing (40) is configured to have a sub-gear (400) provided to be meshable on both sides of the main gear (110) as shown in FIGS. 6 and 7,

[0073] Specifically, the sub-housing (40) is composed of: a fixed shaft (410) having a connecting screw portion (411) formed on the outer circumference of each end for a predetermined length; a fixing nut (420) connected to one of the connecting screw portions (411); and a sub-gear (400) connected to the rear of the fixing nut (410) and having a bearing (B) on the inside.

[0074] In addition, the reference numeral 50 indicates a finishing portion, and as shown in FIGS. 1, 2, and 9, the finishing portion (50) is coupled to one side of the outer periphery of the main housing (20).

[0075] Particularly preferably, the outer surface of the main housing (20), the finishing part (50), and the drive shaft (10) is coated with a liquid mixture comprising 16% by weight of ethanol, 8% by weight of ethyl silicate, 11% by weight of aluminum oxide, 15% by weight of isopropyl alcohol, 15% by weight of silica hydrate, 12% by weight of mica, 14% by weight of triethoxymethylsilane, and 9% by weight of dihydrogen oxide.

[0076] By applying a coating agent in this manner, it is intended to prevent corrosion, deformation, or other chemical changes caused by harmful substances in the external environment during operation, thereby protecting the human body and preventing the spraying and emission of pollutants, as well as to resolve environmental pollution issues arising from fusion with ultraviolet rays or other chemical bonding.

[0077] The assembly and operation relationship of the present invention will be described below.

[0078] First, the drive shaft (10) is connected to the wheel frame (H), and then the spoke (S) is fixedly fastened to the fixing hole (101) to fix the drive shaft (10) and the wheel frame (H).

[0079] In the above state, a bearing part (200) is accommodated in the main housing (20), that is, the first housing (210) and the second housing (220), with a bearing (B) provided in the first seating groove (213) and the second seating groove (223) as shown in FIGS. 5 and 6, and the bearing part (200) is fastened with a ring (201) attached to the front and rear of the bearing part (200), and then the first coupling hole (211) and the second coupling hole (221) are joined using a bolt (V).

[0080] At this time, the reason for fastening the ring (201) is that the bearing (B) is provided on both sides based on the drive shaft (10) in the present invention, so that only the inner ring body (203) and the ring (201) of the bearing part (200) rotate, and the outer ring body (202) is fixed to the main housing (20), and at the same time, the main housing (20) is fixed by the main body connecting part (C) connected to the main body of the bicycle as shown in FIG. 8.

[0081] As described above, the bearing part (200) and the ring part (201) are fastened and combined to the main housing (20), and the fixed shaft (410), having one side connecting screw part (411) formed on the fastening screw part (214) of the fastening through-hole (215), is fastened and fixed as shown in FIG. 8, and a fixing nut (420) is fastened to the other side connecting screw part (411).

[0082] When a user drives the drive shaft (10) in the assembled state as described above, the wheel frame (H) is driven simultaneously, and at the same time, the main gear (110) and sub-gear (400) provided at both ends of the drive shaft (10) are engaged and driven as shown in FIG. 9, thereby distributing the load through the sub-gear (400) and reducing the load applied to the bearing (B) of the drive shaft (10), making it easier to drive the bicycle.

[0083] The present invention, configured as described above, integrates the bicycle wheel frame and the drive shaft to enable simultaneous operation of the range driven by the power of the user's pedals, unlike conventional methods. By integrating the wheel frame and the drive shaft, a main gear is integrally provided at each end of the drive shaft, and sub-gears are provided on both sides of the main gear. This allows the load concentrated on the drive shaft when the user pedals to be distributed through the sub-gears, thereby reducing the load applied to the bearings of the drive shaft and making bicycle operation easier. Furthermore, by integrating the wheel frame and the drive shaft and simultaneously providing sub-gears, the invention facilitates bicycle operation and improves the rotational force and durability of the wheel. This enhances the propulsion of the bicycle and maintains the stability of the user's driving force, thereby improving rolling performance and enabling smoother bicycle operation. Additionally, it improves the convenience and durability of replacing parts such as bearings after long-term use of the bicycle.

[0084] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited to the above embodiments, and it is obvious that various modifications and variations from the description above may be possible by those skilled in the art to which the present invention belongs.

[0085] Therefore, the technical concept of the present invention should be understood by the claims set forth below, but it is obvious that all equivalent or analogous variations thereof fall within the scope of the technical concept of the present invention.

[0086] As described above, the bicycle drive device for reducing drive shaft load according to the present invention facilitates bicycle driving by reducing the load applied to the bearings of the drive shaft through the sub-gear, which is provided with a main gear integrally formed at both ends of the drive shaft and a sub-gear meshing with both sides of the main gear, thereby reducing the load concentrated on the drive shaft when the user pedals. Furthermore, it improves rolling performance to enhance the rotational force and durability of the wheels, thereby increasing the propulsion force of the bicycle and maintaining the stability of the user's driving force, enabling smoother bicycle operation. Additionally, it improves the convenience of replacing parts such as bearings due to long-term use of the bicycle and enhances durability, making it an invention with very high industrial applicability.

Claims

1. A wheel frame (H) having a tube detachably provided on its outer surface; A drive shaft (10) integrally fastened to the center of the wheel frame (H), having disc-shaped anti-slip plates (100) integrally provided on both sides at predetermined intervals in a rod shape, and fixing holes (101) are drilled at predetermined intervals in the anti-slip plates (100) so that a spot (S) can be fixedly coupled, and a main gear (110) integrally provided at both ends, and a screw portion (120) formed near the rear of the main gear (110); A main housing (20) provided on the outer side between the above anti-slip plate (100) and the above main gear (110), having a bearing part (200) on the inner circumference, and fixed to the bicycle body by a main body connecting part (C); A fixing fastener (30) coupled to the screw portion (120) to fix the drive shaft (10) and the main housing (20); A sub-housing (40) equipped with a sub-gear (400) configured to be meshable on both sides of the main gear (110); A bicycle drive device for reducing drive shaft load, comprising: a finishing part (50) coupled to one side outer periphery of the main housing (20).

2. In Paragraph 1, The above main housing (20) is, A first housing (210) having a first coupling hole (211) formed at a predetermined interval on the outer edge, a first through hole (212) drilled in the center through which the drive shaft (10) is connected, a first seating groove (213) formed on the outer periphery of the first through hole (212) to which the bearing part (200) is seated and connected, and a fastening through tube (215) having a fastening screw part (214) provided on the inner surface is formed on both sides of the first seating groove (213); A second housing (220) having a second coupling hole (221) formed at a predetermined interval on the outer edge, a second through hole (222) drilled in the center through which the drive shaft (10) is connected, and a second seating groove (223) formed on the outer periphery of the second through hole (222) through which the bearing part (200) is seated and connected; A bicycle drive device for reducing drive shaft load, comprising fastening the first coupling hole (211) and the second coupling hole (221) with a bolt (V).

3. In Paragraph 2, The above bearing part (200) is, A bicycle drive device for reducing drive shaft load, comprising an outer ring body (202) and an inner ring body (203) integrally formed, wherein the outer ring body (202) and the inner ring body (203) are provided on the inner side of the first seating groove (213) and the second seating groove (223), and the outer ring body (202) has a bearing (B) on the inner side and a ring (201) is provided on the front and rear respectively.

4. In Paragraph 1, The above sub-housing (40) is, A fixed shaft (410) having connecting screw portions (411) formed on the outer surface of each end for a predetermined length; A fixing nut (420) coupled to any one of the above coupling screw parts (411); A bicycle drive device for reducing drive shaft load, comprising: a sub-gear (400) coupled to the rear of the above-mentioned fixing nut (410) and having a bearing (B) on the inside.

5. In Paragraph 1, On the outer surface of the main housing (20), the finishing part (50), and the drive shaft (10), ethanol 16 A bicycle drive unit for reducing drive shaft load, comprising applying a coating agent composed of a liquid mixture of 8% by weight of ethyl silicate, 11% by weight of aluminum oxide, 15% by weight of isopropyl alcohol, 15% by weight of silica hydrate, 12% by weight of mica, 14% by weight of triethoxymethylsilane, and 9% by weight of dihydrogen oxide.

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