An axially position-adjustable cycling platform single-stage flywheel structure and cycling platform

Abstract

The application discloses an axially position-adjustable riding platform single-stage flywheel structure and a riding platform. The riding platform flywheel structure comprises a tower base connected to the riding platform, a gear sleeved on the tower base, a chain assembled on the gear and configured to drive the tower base to rotate, an adjusting assembly connected to the tower base, the adjusting assembly comprising an adjusting baffle sleeved on the tower base, one end of the adjusting baffle abutting against the gear, the adjusting baffle being configured to rotate to press the gear or rotate away from the gear to realize axial position adjustment of the gear, and a tower base nut connected to the end of the tower base and used for fixing the gear. The axial position of the riding platform flywheel structure is adjusted to be compatible with different frames and kits.

Description

Technical Field

[0001] This invention belongs to the field of sports training equipment technology, and particularly relates to a single-stage flywheel structure of an axially adjustable cycling train and a cycling train. Background Technology

[0002] With people placing increasing emphasis on health, cycling is becoming more and more common in sports, fitness, and daily commutes. Cycling enthusiasts are no longer limiting their activities to the outdoors; the demand for indoor cycling is also gradually increasing. Trainers can meet users' indoor cycling needs, and users can choose different sizes of trainers based on their body type or exercise requirements. However, because bicycle freewheels and frame sizes vary widely on the market, different trainers need to be equipped with different numbers of sprockets for different frames, which can cause unnecessary trouble for production management and assembly, as well as for user selection.

[0003] Therefore, the technical problem to be solved by this invention is how to design a technology that can adjust the axial position of the flywheel structure to improve the user experience. Summary of the Invention

[0004] This invention provides a single-stage sprocket structure and trainer with adjustable axial position, enabling adjustment of the axial position of the sprocket structure and making it compatible with different frames and components.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] In one aspect, the present invention provides an axially adjustable single-stage flywheel structure for a cycling trainer, comprising:

[0007] The base, which is connected to the riding platform;

[0008] A gear is fitted onto the tower base, and a chain is mounted on the gear, the chain being configured to drive the tower base to rotate;

[0009] An adjustment assembly connected to the tower base includes an adjustment baffle fitted onto the tower base, one end of the adjustment baffle abutting against the gear, and the adjustment baffle being configured to rotate to press against the gear or rotate away from the gear to achieve axial position adjustment of the gear.

[0010] A base nut is attached to the end of the base and is used to secure the gear.

[0011] In some embodiments of this application, the adjustment assembly further includes an adjustment base, which is sleeved on the tower base and located on the side of the adjustment baffle away from the gear. The adjustment base is provided with a first limiting structure, and the end of the adjustment baffle away from the gear is provided with a second limiting structure. The second limiting structure is adapted to the first limiting structure and is used to fix the axial position of the gear.

[0012] In some embodiments of this application, the axial positions of the first limiting structure and the second limiting structure from the reference line of the cycling platform are obtained by using the specifications of a multi-stage flywheel adapted to the cycling platform, and the calculation formula is:

[0013]

[0014] Where Z represents the axial position of the first limiting structure and the second limiting structure from the reference line of the riding platform; M represents the thickness of the multi-stage sprocket; k represents the gear of the multi-stage sprocket; B represents the tooth wall thickness of the multi-stage sprocket; and δ represents the distance between adjacent teeth of the multi-stage sprocket.

[0015] In some embodiments of this application, the first limiting structure includes several sets of elastic buckles, and the second limiting structure includes several sets of slot structures. Each set of slot structures includes multiple slots, and the elastic buckles are adapted to and correspondingly set with the slots.

[0016] In some embodiments of this application, there is a height difference between two adjacent slots in each set of slot structures. This height difference is the axial distance that the adjusting baffle needs to move when adjusting the axial position of the gear, and the calculation formula is as follows:

[0017]

[0018] Wherein, H represents the axial distance that the adjusting baffle needs to move; k represents the gear of the multi-stage flywheel; and M represents the speed of the multi-stage flywheel. i Indicates the thickness of the i-speed multi-stage flywheel; B i Indicates the gear wall thickness of the i-speed multi-stage flywheel; δ i The distance between adjacent teeth of the multi-stage flywheel is represented by ; i represents the speed of the multi-stage flywheel, which is a natural number ≥ 2.

[0019] In some embodiments of this application, chamfers are provided on both sides of the card slot, and the chamfers are less than 45°.

[0020] In some embodiments of this application, the adjustment assembly further includes a thrust elastic element, which is sleeved on the base and located at one end of the gear near the riding platform. The thrust elastic element is used to provide thrust to the gear so that it does not move axially during operation.

[0021] In some embodiments of this application, the bike train flywheel device further includes a chain baffle, which is fitted onto the freewheel base and located at one end of the gear near the bike train.

[0022] In some embodiments of this application, the distance between the chain baffle and the adjusting baffle is greater than or equal to the width of the chain, and the distance between the gear and the adjusting baffle is greater than the width of the narrowest chain.

[0023] In another aspect, the present invention also provides a cycling trainer, including a cycling trainer body, wherein the cycling trainer body is provided with a single-stage flywheel structure that is axially adjustable as described in any of the above claims.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are: by setting the adjustment component, the axial position of the single-stage flywheel can be adjusted, thereby adapting to frames and gearboxes of different speeds, saving a lot of unnecessary trouble for production management and assembly as well as for user selection, and improving the user experience and convenience. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of an embodiment of the single-stage flywheel structure of the axially adjustable cycling platform of the present invention.

[0027] Figure 2 for Figure 1 A sectional view;

[0028] Figure 3 This is an exploded view of an embodiment of the single-stage flywheel structure of the axially adjustable riding platform of the present invention;

[0029] Figure 4 This is a schematic diagram of the adjusting baffle in one embodiment of the axially adjustable single-stage flywheel structure of the cycling train of the present invention. Figure 1 ;

[0030] Figure 5 This is a schematic diagram of the adjusting baffle in one embodiment of the axially adjustable single-stage flywheel structure of the cycling train of the present invention. Figure 2 ;

[0031] Figure 6 for Figure 4 Top view;

[0032] Figure 7 for Figure 4 Side view;

[0033] Figure 8 This is a dimensional definition diagram of a multi-stage flywheel structure adapted to a cycling train in one embodiment of the single-stage flywheel structure of the axially adjustable cycling train of the present invention.

[0034] Figure 9 This is a schematic diagram of the structure of the adjusting base in one embodiment of the axially adjustable single-stage flywheel structure of the cycling train of the present invention. Figure 1 ;

[0035] Figure 10 for Figure 9 A partially enlarged schematic diagram of the card slot structure;

[0036] Figure 11 for Figure 9 Schematic diagram of the chamfered center;

[0037] Figure 12 This is a schematic diagram of the chain baffle structure in one embodiment of the axially adjustable single-stage flywheel structure of the present invention. Figure 1 ;

[0038] Figure 13 This is a schematic diagram of the chain baffle structure in one embodiment of the axially adjustable single-stage flywheel structure of the present invention. Figure 2 ;

[0039] Figure 14 This is a schematic diagram of the trainer frame and chain.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100. Base; 101. Keyway; 102. Divider section;

[0042] 200. Gear;

[0043] 300. Adjustment component; 301. Adjustment baffle; 3011. Abutment part; 3012. Elastic buckle; 30121. Elastic sheet; 30122. Limiting protrusion; 302. Adjustment base; 3021. Second spline; 3022. Slot structure; 30221. Slot; 30222. Rotary slide; 30223. Spacer; 30224. Chamfer; 3023. Marking; 303. Thrust elastic element; 304. Chain baffle; 3041. Limiting boss; 3042. Third spline; 3043. Baffle wall;

[0044] 400. Tower base nut. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0050] like Figures 1 to 14 As shown, this embodiment discloses a single-stage freewheel structure for a cycling train with adjustable axial position, including a freehub base 100, a gear 200, an adjustment component 300, and a freehub base nut 400. The gear 200 can be adjusted axially, so that the same freewheel structure can be compatible with different frames and components.

[0051] The freewheel base 100 is a platform for mounting the flywheel structure. The freewheel base 100 is a columnar body and is a common structure for cycling devices such as bicycles and trainers. The freewheel base 100 is rotatably connected to the hub of the trainer. The flywheel structure is mounted on the freewheel base 100 and is used to transmit the rotation of the flywheel structure to the trainer to drive the trainer. The column of the freewheel base 100 has keyways 101 on its periphery. The keyways 101 are grooves formed between two adjacent rectangular partitions 102 on the column of the freewheel base 100. The keyways 101 are evenly distributed on the periphery of the column and are used to mount gears 200 and other structures.

[0052] The gear 200 is fitted onto the freehub base 100. A rectangular first spline (not shown in the figure) is arranged on the inner ring of the gear 200, i.e., the inner wall facing the freehub base 100. This first spline mates with the keyway 101 on the freehub base 100. A chain is mounted on the teeth of the gear 200. When the user moves, the pedals of the bike trainer drive the chain, which in turn drives the gear 200 to rotate, thereby driving the freehub base 100 to rotate. The gear 200 is made of steel, is compatible with the chain, and is durable.

[0053] The adjustment assembly 300 is connected to the freehub base 100 and is used to adjust the axial position of the gear 200 on the freehub base 100 so that the same single-stage freewheel structure can be adapted to different sizes of frames and kits.

[0054] The base nut 400 is attached to the base 100 and is used to secure the gear 200.

[0055] During installation, assemble gear 200 and adjustment component 300 onto freehub base 100, and then assemble freehub base 100 onto the trainer. During use, the user adjusts adjustment component 300 according to the model of the trainer frame and components to adjust the axial position of gear 200 to adapt to different trainer models. Finally, screw freehub base nut 400 onto freehub base 100 to fix gear 200 and complete the axial position adjustment of the freewheel structure.

[0056] like Figures 4 to 7 As shown, in this embodiment, the adjustment component 300 includes an adjustment baffle 301, which is disc-shaped with a circular through hole in the center. The circular through hole of the adjustment baffle 301 is fitted onto the base 100 on the side of the gear 200 away from the riding platform. The side of the adjustment baffle 301 facing the gear 200 has an inner wall that extends upward to form an abutment portion 3011, which abuts against the gear 200.

[0057] When it is necessary to adjust the axial position of gear 200, the user rotates the adjustment baffle 301 toward the direction of the riding platform. The adjustment baffle 301 moves along the base 100 and pushes gear 200 to move axially. The user stops rotating the adjustment baffle 301 at the desired position, thus achieving the adjustment of the axial position of gear 200.

[0058] like Figures 9 to 11 As shown, the adjustment assembly 300 also includes an adjustment base 302, which is an annular component with a certain height. The adjustment base 302 is located on the side of the adjustment baffle 301 away from the gear 200. The adjustment base 302 is fitted onto the tower base 100. A rectangular second spline 3021 is provided on the inner wall of the adjustment base 302. The second spline 3021 is adapted to the keyway 101 on the tower base 100. When the tower base 100 rotates, it will drive the adjustment base 302 to rotate together.

[0059] The adjusting base 302 is provided with a first limiting structure, and the adjusting baffle 301 is provided with a second limiting structure at the end away from the gear 200. The second limiting structure is adapted to the first limiting structure, and the two work together to fix the axial position of the gear 200.

[0060] The first limiting structure includes several sets of slot structures 3022. Each set of slot structures 3022 includes multiple slots 30221. In this embodiment, the adjusting base 302 is provided with 3 sets of slot structures 3022, and each set of slot structures 3022 has 4 slots 30221. The slots 30221 are grooves formed by recessing inward on the outer surface of the side wall of the adjusting base 302.

[0061] like Figure 9 , Figure 10As shown, four slots 30221 are arranged sequentially at different heights. The ends of the four slots 30221 facing the adjustment baffle 301 are flush, while the ends facing away from the adjustment baffle 301 have a height difference. Adjacent slots 30221 are spaced apart by a partition 30223. The end of the partition 30223 facing away from the adjustment baffle 301 is provided with a rotating slide 30222. The rotating slide 30222 is a groove formed by indentation on the outer surface of the partition 30223, but the groove depth of the rotating slide 30222 is less than the groove depth of the slot 30221. The rotation angle of the rotating slide 30222 is obtained by connecting the different heights of the four slots 30221. For easy identification, the words "suitable for different cycling speeds" 3023 are marked below each slot 30221.

[0062] like Figure 5 As shown, the second limiting structure includes several sets of elastic buckles 3012. The number and position of the elastic buckles 3012 are adapted to the slot 30221. In this embodiment, the elastic buckles 3012 include 3 sets. Each set of elastic buckles 3012 includes an elastic piece 30121 and a limiting protrusion 30122. The elastic piece 30121 is a rectangular piece formed by opening two adjacent rectangular holes on the inner wall of the circular through hole of the adjusting baffle 301. One end of the elastic piece 30121 can move under the action of force. The limiting protrusion 30122 is provided at the movable end of the elastic piece 30121 and is adapted to the rotating slide 30222.

[0063] When the axial position of the flywheel structure needs to be adjusted, the user rotates the adjusting baffle 301 clockwise or counterclockwise. The second limiting structure of the adjusting baffle 301, namely the elastic buckle 3012, rotates clockwise. The limiting protrusion 30122 of the elastic buckle 3012 falls into the slot 30221 through the rotating slide 30222. According to the specifications of the riding train and the matching speed markings 3023 below the slot 30221, the appropriate slot 30221 is selected, and the limiting protrusion 30122 falls into the corresponding slot 30221. The limiting protrusions 30122 of the three elastic buckles 3012 fall into the corresponding slots 30221 of the three sets of slot structures 3022 respectively. During this process, the gear 200 can move axially, thereby completing the axial position adjustment of the single-stage flywheel structure.

[0064] The first and second limiting structures are located in the same position during use. Therefore, the axial distance between the setting position of the first limiting structure on the adjusting base 302 and the setting position of the second limiting structure on the adjusting baffle 301 and the reference line of the cycling train is the same. The axial distance is calculated based on the size specifications of the multi-stage flywheel adapted to the cycling train, and the calculation formula is as follows:

[0065]

[0066] Where Z represents the axial position of the first and second limiting structures from the baseline of the riding platform; M represents the thickness of the multi-stage sprocket; k represents the gear of the multi-stage sprocket; B represents the tooth wall thickness of the multi-stage sprocket; and δ represents the distance between adjacent teeth of the multi-stage sprocket.

[0067] It should be noted that for the flywheels of trainers of different speeds, the highest speed gear is defined as the first gear, taking into account the compatibility of each speed.

[0068] In this embodiment, the single-stage cassette is positioned at the fifth gear of the cassette, with the chainline as the baseline (the chainline is the line parallel to the center line of the bike frame, passing through the center of the chainring to the center of the multi-stage cassette structure; see reference for details). Figure 14 The position information of the clip slot 30221 for the fifth gear position of 8-speed, 9-speed, 10-speed, and 11-speed cassettes is shown in Table 1 below:

[0069] Table 1. Location information of the buckle and slot of the single-stage flywheel structure of the axially adjustable cycling train.

[0070]

[0071] When designing the adjusting baffle 301, each set of slot structures 3022 includes 4 slots 30221. The height difference between the slots 30221 is the axial distance that the adjusting baffle 301 needs to move, which is also the axial distance that the gear 200 moves, thereby realizing the axial position adjustment of the flywheel structure.

[0072] The formula for calculating the axial distance that the adjusting baffle 301 needs to move is as follows:

[0073]

[0074] Where H represents the axial distance that the adjusting baffle needs to move; M i Indicates the thickness of the i-speed multi-stage flywheel; B i Indicates the gear wall thickness of the i-speed multi-stage flywheel; δ i The distance between adjacent teeth of the multi-stage flywheel is represented by ; i represents the speed of the multi-stage flywheel, which is a natural number ≥ 2.

[0075] In this embodiment, the position of the single-stage flywheel corresponds to the fifth gear of the multi-stage flywheel. Taking the fifth gear of the 9-speed multi-stage flywheel as the initial position of the adjustment baffle 301, the axial distance H that the adjustment baffle 301 needs to move to the fifth gear of the 9-speed, 10-speed, and 11-speed flywheels is shown in Table 2 below:

[0076] Table 2 Axial movement distance H of the adjusting baffle

[0077]

[0078] like Figure 10 As shown, to prevent the adjustment baffle 301 from spinning when the single-stage flywheel is working on the trainer, chamfers 30224 are provided on both sides of the slot 30221, and the chamfers 30224 need to be less than 45°. This ensures that the adjustment baffle 301 can only rotate under external force and is locked when not under external force, so that it will not spin.

[0079] like Figures 1 to 3 As shown, the adjustment assembly 300 also includes a thrust elastic element 303, which is fitted onto the base 100 and located at the end of the gear 200 near the trainer. The thrust elastic element 303 is used to provide thrust to the gear 200 so that it does not move axially during operation.

[0080] In this embodiment, the thrust elastic element 303 is a compression sleeve made of materials such as silicone or metal that have compression and rebound characteristics. One end of the thrust elastic element 303 abuts against the gear 200, and the other end abuts against the tower base 100.

[0081] The freewheel structure also includes a chain baffle 304, which is used to prevent the chain from falling off. The chain baffle 304 is a disc structure with a mounting hole in the center. The inner ring of the chain baffle 304 is provided with axially evenly arranged third splines 3042. The third splines 3042 can cooperate with the keyway 101 of the freehub base 100, so that the freehub base 100 rotates together with the chain baffle 304 when it rotates.

[0082] like Figure 12 , Figure 13 As shown, the chain baffle 304 is installed between the gear 200 and the thrust elastic member 303. The chain baffle 304 has a limiting boss 3041 on the side near the gear. The limiting boss 3041 can limit the gear 200. During installation, the limiting boss 3041 of the chain baffle 304 abuts against the gear 200. The side of the chain baffle 304 near the thrust elastic member 303 is flat and contacts the thrust elastic member 303 to ensure that the thrust elastic member 303 effectively provides thrust to the chain baffle 304.

[0083] like Figure 12 As shown, the chain baffle 304 is also provided with a baffle wall 3043, the diameter of which is not less than the maximum outer diameter of the gear 200, which can effectively prevent the chain from falling off. The distance between the chain baffle and the adjusting baffle is greater than or equal to the width of the chain, and the distance between the gear and the adjusting baffle is greater than the width of the narrowest chain.

[0084] This embodiment also provides a cycling trainer, including a cycling trainer body, on which a single-stage flywheel structure with axial position adjustable as described above is provided.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A single-stage flywheel structure for a cycling trainer with adjustable axial position, characterized in that, include: The base, which is connected to the riding platform; A gear is fitted onto the tower base, and a chain is mounted on the gear, the chain being configured to drive the tower base to rotate; An adjustment assembly, connected to the freehub base, includes an adjustment baffle fitted onto the freehub base, one end of which abuts against a gear. The adjustment baffle is configured to rotate and press against the gear, or rotate away from the gear to adjust the axial position of the gear. The adjustment assembly also includes an adjustment base fitted onto the freehub base and located on the side of the adjustment baffle away from the gear. The adjustment base has a first limiting structure, and the end of the adjustment baffle away from the gear has a second limiting structure. The second limiting structure is adapted to the first limiting structure and is used to fix the axial position of the gear. The axial positions of the first and second limiting structures from the reference line of the trainer are obtained through the specifications of a multi-stage freewheel adapted to the trainer, calculated using the following formula: ； in, This indicates the axial position of the first limiting structure and the second limiting structure relative to the reference line of the riding platform; Indicates the thickness of a multi-stage flywheel; Indicates the gear position of a multi-stage flywheel; Indicates the tooth plate wall thickness of a multi-stage flywheel; Indicates the distance between adjacent gears of a multi-stage flywheel; The first limiting structure includes several sets of elastic buckles, and the second limiting structure includes several sets of slot structures. Each set of slot structures includes multiple slots, and the elastic buckles are adapted to and correspondingly set with the slots. A base nut is attached to the end of the base and is used to secure the gear.

2. The single-stage flywheel structure and cycling train with adjustable axial position according to claim 1, characterized in that, There is a height difference between two adjacent slots in each set of slot structures. The height difference is the axial distance that the adjusting baffle needs to move when adjusting the axial position of the gear. The calculation formula is as follows: ； in, This indicates the axial distance that the adjusting baffle needs to move; k represents the gear of the multi-stage flywheel. Indicates the thickness of the i-speed multi-stage flywheel; This indicates the gear wall thickness of the i-speed multi-stage flywheel; represents the distance between adjacent gears of a multi-stage flywheel; i represents the speed of the multi-stage flywheel, which is a natural number ≥ 2.

3. The axially adjustable single-stage flywheel structure for a cycling train according to claim 2, characterized in that, The card slot has chamfers on both sides, and the chamfers are less than 45°.

4. The axially adjustable single-stage flywheel structure for a cycling train according to claim 1, characterized in that, The adjustment assembly also includes a thrust elastic element, which is sleeved on the base of the chainring and located at one end of the gear near the riding platform. The thrust elastic element is used to provide thrust to the gear so that it does not move axially during operation.

5. The axially adjustable single-stage flywheel structure for a cycling train according to claim 1, characterized in that, The bike train flywheel assembly also includes a chain baffle, which is fitted onto the freehub base and located at one end of the gear near the bike train.

6. The axially adjustable single-stage flywheel structure for a cycling train according to claim 5, characterized in that, The distance between the chain baffle and the adjusting baffle is greater than or equal to the width of the chain, and the distance between the gear and the adjusting baffle is greater than the narrowest width of the chain.

7. A cycling trainer, comprising a cycling trainer body, characterized in that, The cycling train body is provided with a single-stage flywheel structure with axial position adjustment as described in any one of claims 1-6.

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