A riding platform single-speed freewheel structure and a riding platform
By integrating the connecting shaft and pulley into a single-speed freewheel structure, the problems of wear and noise between the bicycle freewheel and the trainer shaft are solved, achieving compatibility with different frames and convenient assembly, thus improving the user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO MAGENE INTELLIGENCE TECH CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-21
AI Technical Summary
The clearance fit between the bicycle freewheel structure and the trainer axle leads to axle wear after prolonged use, damage to the freewheel bearing, and frequent abnormal noises. Furthermore, different frames require freewheels with different numbers of sprockets, making production and user selection difficult.
Design a single-speed flywheel structure for a cycling trainer, with the connecting shaft and pulley integrally formed. The axial position of the flywheel assembly can be adjusted to accommodate different frames, and an adjusting component is used to provide preload to prevent wear and abnormal noise.
It reduces the difficulty of structural design, facilitates assembly, avoids wear and abnormal noise of connecting shafts, improves user experience, and simplifies production management and user selection.
Smart Images
Figure CN224528907U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cycling trainer technology, specifically to a single-speed flywheel structure for a cycling trainer and a cycling trainer. Background Technology
[0002] With the improvement of manufacturing capabilities and the increasing demand for cycling, bicycle freewheel structures have evolved from the 10-speed and 11-speed freewheels common a few years ago to the now prevalent 12-speed freewheels, with the upcoming 13-speed freewheel. While the increasing number of speeds on bicycle freewheels brings a better outdoor cycling experience, it also increases the structural design challenges for indoor direct-drive trainer products.
[0003] Because trainers need to be compatible with bicycle freewheels and use the freewheel base structure, this structure has a clearance fit with the trainer axle. After prolonged use, the axle will wear down, leading to damage to the freewheel base bearing. Furthermore, the freewheel base is difficult to remove and replace, causing abnormal noises from the freewheel base area during trainer use, resulting in a poor user experience.
[0004] Because bicycle freewheels and frames come in a wide variety of sizes on the market, different freewheels with different numbers of sprockets are required for different frames, which can cause unnecessary trouble for production management and assembly as well as for user selection. Summary of the Invention
[0005] The purpose of this utility model is to provide a single-speed flywheel structure for a cycling train and a cycling train, which can adjust the axial position of the flywheel assembly to be compatible with different frames; the connecting shaft and pulley are formed into one piece, which can reduce the difficulty of structural design and facilitate assembly.
[0006] Therefore, this utility model provides a single-speed flywheel structure for a cycling trainer, comprising: a pulley assembly including a pulley with a connecting shaft on the pulley; a flywheel assembly sleeved and connected to the connecting shaft; the flywheel assembly comprising: a flywheel with a first chain stop plate and a second chain stop plate respectively on both sides; the axial position of the flywheel can be adjusted by rotating the first chain stop plate and / or the second chain stop plate to move the flywheel closer to and / or further away from the pulley; an adjusting member sleeved on the connecting shaft and located at the end of the flywheel closer to the pulley; the adjusting member is used to provide preload to the flywheel and to adjust the axial position of the flywheel.
[0007] Preferably, the connecting shaft extends outward from the center of the pulley, and the axial direction of the connecting shaft coincides with the axial direction of the pulley.
[0008] Preferably, the connecting shaft is a hollow structure with an open end, and a locking nut is connected to the open end of the connecting shaft. The locking nut is used to lock and fix the flywheel assembly.
[0009] Preferably, the inner ring of the flywheel is provided with a first buckle groove, and the first chain retainer plate is provided with a first locking block that cooperates with the first buckle groove.
[0010] Preferably, the inner ring of the flywheel is provided with a second buckle groove, and the second chain retainer plate is provided with a second buckle block that cooperates with the second buckle groove.
[0011] Preferably, the corresponding surfaces of the first and second chain guide plates are respectively provided with chain guide surfaces.
[0012] Preferably, the adjusting element is a shim and / or a spring washer.
[0013] Preferably, the shim thickness for an 8-speed flywheel is defined as H8, and the shim thickness for other speed flywheels is defined as H. i Compared to the shim thickness H8 of an 8-speed cassette, the shim thickness H of other speed cassettes is... i The required increase (or decrease) in thickness is H, and the formula for calculating H is: ; M8 represents the thickness of the 8-speed flywheel; B8 represents the gear wall thickness of the 8-speed flywheel; δ8 represents the spacing between adjacent gears of the 8-speed flywheel; M i Indicates the thickness of the i-speed flywheel; B i Indicates the gear wall thickness of the i-speed flywheel; δ i This represents the spacing between adjacent teeth of the i-speed flywheel; i represents the flywheel speed, and i is a natural number ≥ 2.
[0014] Preferably, a protruding positioning ring is fitted onto the end of the connecting shaft near the pulley, and the adjusting member abuts against the positioning ring.
[0015] This utility model also provides a cycling trainer, including a cycling trainer body, on which the single-speed flywheel structure of the cycling trainer is provided.
[0016] Compared with the prior art, the advantages and positive effects of this utility model are: The connecting shaft of this application is equivalent to the base structure of the tower. The connecting shaft and the pulley are formed as one piece, which can reduce the structural design difficulty of the single-speed flywheel structure and facilitate the assembly of the single-speed flywheel structure. In addition, the connection shaft and the pulley are formed as one piece, which can avoid wear of the connecting shaft and avoid abnormal noise, thereby improving the user experience and extending the service life of the single-speed flywheel structure.
[0017] This application allows for adjustment of the axial position of the flywheel assembly, thereby adapting to frames of different speed ranges. This eliminates many unnecessary hassles for production management and assembly, as well as for user selection, improving the user experience and convenience.
[0018] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of one embodiment of the single-speed flywheel structure of the cycling train of this utility model; Figure 2 This is an exploded view of one embodiment of the single-speed flywheel structure of the cycling train of this utility model; Figure 3 This is one of the structural schematic diagrams of an embodiment of the pulley assembly of this utility model; Figure 4 This is an exploded structural diagram of one embodiment of the flywheel assembly of this utility model; Figure 5 This is a schematic diagram of an embodiment of the first guide chain plate of this utility model; Figure 6 This is a schematic diagram of one embodiment of the flywheel of this utility model; Figure 7 This is a second schematic diagram of an embodiment of the flywheel of this utility model; Figure 8 This is a schematic diagram of one embodiment of the second guide chain plate of this utility model; Figure 9 This is a second schematic diagram of an embodiment of the second chain plate of this utility model; Figure 10 This is the third schematic diagram of an embodiment of the second chain plate of this utility model; Figure 11 This is a second schematic diagram of the structure of one embodiment of the pulley assembly of this utility model; Figure 12 This is a cross-sectional schematic diagram of one embodiment of the single-speed flywheel structure of the cycling train of this utility model; Figure 13 This is a cross-sectional schematic diagram of another embodiment of the single-speed flywheel structure of the cycling platform of this utility model; Figure 14 This is a schematic diagram of the structure of one embodiment of the cycling platform of this utility model; Belt pulley assembly 100, belt pulley 101, connecting shaft 102, first bearing 103, second bearing 104, third bearing 105, fourth bearing 106, first spacer 107, second spacer 108, third spacer 109, belt pulley shaft 110, locking nut 111, positioning ring 112. Flywheel assembly 200, flywheel 201, first chain stop plate 202, second chain stop plate 203, plastic shell 2031, metal insert 2032, connecting groove 2033, positioning groove 2034, first buckle groove 204, first buckle block 205, second buckle groove 206, second buckle block 207. Adjustment component 300. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0021] like Figures 1-13 As shown, the single-speed flywheel structure of this utility model includes a pulley assembly 100 and a flywheel assembly 200. The pulley assembly 100 is a belt-driven drive wheel that connects the bicycle flywheel and the cycling train, used to transmit the rotation from the bicycle pedals to the bicycle flywheel to the cycling train. The flywheel assembly 200 rotates with the bicycle pedals and can transmit the rotation to the pulley assembly 100.
[0022] The pulley assembly 100 includes a pulley 101, on which a connecting shaft 102 is provided. The connecting shaft 102 extends outward from the center of the pulley 101, and the axial direction of the connecting shaft 102 coincides with the axial direction of the pulley 101. The pulley 101 and the connecting shaft 102 can be integrally formed by a processing technology, and no specific limitation is made here.
[0023] The connecting shaft 102 of this application is equivalent to the base structure of the tower. The connecting shaft 102 and the pulley 101 are formed as one piece, which can reduce the structural design difficulty of the single-speed flywheel structure and facilitate the assembly of the single-speed flywheel structure. In addition, the connecting shaft 102 and the pulley 101 are formed as one piece, which can avoid wear of the connecting shaft 102 and avoid abnormal noise, thereby improving the user experience and extending the service life of the single-speed flywheel structure.
[0024] The connecting shaft 102 is a hollow structure with openings at both ends. Inside the connecting shaft 102, a first bearing 103, a second bearing 104, a third bearing 105, and a fourth bearing 106 are arranged in sequence. A first spacer 107 is tightly abutting between the first bearing 103 and the second bearing 104. A second spacer 108 is tightly abutting between the second bearing 104 and the third bearing 105. A third spacer 109 is tightly abutting between the third bearing 105 and the fourth bearing 106.
[0025] The first bearing 103, the second bearing 104, the third bearing 105 and the fourth bearing 106 are sequentially press-fitted into the connecting shaft 102. The spacers between adjacent bearings can protect the bearings and prevent them from being crushed during the press-fitting process.
[0026] The inner diameters of the first bearing 103, the second bearing 104, the third bearing 105, and the fourth bearing 106 are equal, and they are interconnected. The outer diameters of the first bearing 103, the second bearing 104, and the third bearing 105 decrease sequentially, while the outer diameters of the third bearing 105 and the fourth bearing 106 are equal, allowing the four bearings to be press-fitted into place in one operation.
[0027] The pulley assembly 100 also includes a pulley shaft 110, which is inserted through the connecting shaft 102. Specifically, the pulley shaft 110 is interference-fitted with the inner rings of the first bearing 103, the second bearing 104, the third bearing 105, and the fourth bearing 106, and the pulley 101 is interference-fitted with the outer rings of the first bearing 103, the second bearing 104, the third bearing 105, and the fourth bearing 106. The pulley 101 and the connecting shaft 102 can rotate around the pulley shaft 110.
[0028] The pulley shaft 110 can be connected to the frame of the cycling trainer, thereby allowing the single-speed flywheel structure of this application to be installed on the cycling trainer.
[0029] By sequentially pressing multiple bearings into the connecting shaft 102, the pulley 101 and the connecting shaft 102 can achieve smooth and efficient rotation.
[0030] The end opening of the connecting shaft 102 away from the pulley 101 is connected to a locking nut 111. The locking nut 111 is used to lock and fix the flywheel assembly 200, which can lock the flywheel assembly 200 onto the connecting shaft 102.
[0031] In one embodiment of this application, the inner wall of the end of the connecting shaft 102 away from the pulley 101 is provided with an internal thread (not shown in the figure), so that the locking nut 111 can be threaded into the connecting shaft 102, and the locking nut 111 can prevent the flywheel assembly 200 from axially moving.
[0032] The flywheel assembly 200 is sleeved and connected to the connecting shaft 102. In one embodiment of this application, the outer wall of the connecting shaft 102 is provided with an external thread, and the inner ring of the flywheel assembly 200 is provided with an internal thread, so that the flywheel assembly 200 can be threadedly connected to the connecting shaft 102 and the flywheel assembly 200 can rotate along the connecting shaft 102.
[0033] The flywheel assembly 200 includes a flywheel 201, with a first chain retainer 202 and a second chain retainer 203 on each side. Since the flywheel assembly 200 is threaded onto the connecting shaft 102, the flywheel assembly 200 can rotate around the connecting shaft 102 as a whole. By rotating the first chain retainer 202 and / or the second chain retainer 203, the flywheel 201 can be moved closer to and / or further away from the pulley 101, thereby achieving axial position adjustment of the flywheel assembly 200.
[0034] The flywheel 201, the first chain retainer 202, and the second chain retainer 203 are provided with corresponding through-holes, all with the same diameter. The inner holes are provided with identical internal threads, allowing the flywheel assembly 200 to be threadedly connected to the connecting shaft 102. The thread tightening direction is the same as the rotation direction of the pulley 101 during operation.
[0035] The inner ring of the flywheel 201 is equipped with a one-way bearing. When the bicycle pedals stop rotating, the trainer continues to rotate due to inertia. The rotation of the trainer will drive the one-way bearing of the flywheel 201 to rotate, while the flywheel 201 will not rotate, thus preventing it from stopping directly.
[0036] In one embodiment of this application, the inner ring of the flywheel 201 is provided with a first latching groove 204, and the first chain stop plate 202 is provided with a first latching block 205 that cooperates with the first latching groove 204. Specifically, the flywheel 201 has a plurality of recessed first latching grooves 204 on the side corresponding to the first chain stop plate 202, and the plurality of first latching grooves 204 are equally spaced around the inner ring of the flywheel 201; correspondingly, the first chain stop plate 202 has a plurality of protruding first latching blocks 205, and the plurality of first latching blocks 205 respectively engage with the plurality of first latching grooves 204, thereby enabling the first chain stop plate 202 to be engaged and fixed on the flywheel 201.
[0037] In one embodiment of this application, the inner ring of the flywheel 201 is provided with a second latching groove 206, and the second chain stop plate 203 is provided with a second latching block 207 that cooperates with the second latching groove 206. Specifically, the flywheel 201 has a plurality of recessed second latching grooves 206 on the side corresponding to the second chain stop plate 203, and the plurality of second latching grooves 206 are equally spaced around the inner ring of the flywheel 201; correspondingly, the second chain stop plate 203 has a plurality of protruding second latching blocks 207, and the plurality of second latching blocks 207 respectively engage with the plurality of second latching grooves 206, thereby allowing the second chain stop plate 203 to be engaged and fixed on the flywheel 201.
[0038] In one embodiment of this application, the first stop chain plate 202 is disposed near the pulley 101. When assembling the flywheel assembly 200, it is recommended to use a tooling guide. Rotating the second stop chain plate 203 clockwise will cause the flywheel 201 and the first stop chain plate 202 to rotate synchronously clockwise, thereby screwing the entire flywheel assembly 200 onto the connecting shaft 102. When disassembling the flywheel assembly 200, rotating the second stop chain plate 203 counterclockwise will cause the flywheel 201 and the first stop chain plate 202 to rotate synchronously counterclockwise until the flywheel assembly 200 is rotated off the connecting shaft 201, completing the disassembly of the flywheel assembly 200.
[0039] Since the second chain plate 203 is designed for disassembly and assembly, and considering the large torque required for threaded disassembly and assembly, the second chain plate 203 adopts a design with a plastic shell 2031 and a metal insert 2032. The plastic shell 2031 has a connecting groove 2033 with a hexagonal cross-sectional shape. The corresponding metal insert 2032 is hexagonal prism-shaped and is embedded and fixed in the connecting groove 2033. This increases the circumferential contact area between the metal insert 2032 and the plastic shell 2031, making the fit between the plastic shell 2031 and the metal insert 2032 more secure. This ensures that the plastic shell 2031 does not detach from the metal insert 2032 when screwing into or out of the second chain plate 203. The metal insert 2032 has an inner hole with internal threads on its inner wall. Multiple protruding second locking blocks 207 are arranged at equal intervals around the inner hole, and the plastic shell 2031 is provided with a positioning groove 2034 that cooperates with the second locking blocks 207 to facilitate the positioning of the second locking blocks 207.
[0040] The freewheel 201 is equipped with meshing teeth that can engage with the chain. The rotation of the freewheel 201 drives the chain to rotate. The tooth shape of the meshing teeth is the same as that of the rear freewheel of a bicycle, making it compatible with all bicycle chain structures. The number of teeth on the meshing teeth can be 14, 16, etc., depending on the product development needs.
[0041] By setting a first chain stop plate 202 and a second chain stop plate 203 on both sides of the flywheel 201, the chain can be limited to prevent it from falling off the flywheel 201.
[0042] The first chain plate 202 and the second chain plate 203 have corresponding chain guide surfaces. The chain guide surfaces can guide the chain, making it easy for the chain to be installed into the flywheel 201 during assembly. The chain guide surfaces can also limit the chain and effectively prevent the chain from detaching from the flywheel 201.
[0043] Adjusting element 300 is sleeved on connecting shaft 102 and located at one end of flywheel 201 near pulley 101. Adjusting element 300 is used to provide preload to flywheel 201 so that it does not move axially during operation.
[0044] In one embodiment of this application, a protruding positioning ring 112 is provided on the end of the connecting shaft 102 near the pulley 102. The adjusting member 300 abuts against the positioning ring 112, and the positioning ring 112 can play a positioning and limiting role in the installation of the adjusting member 300.
[0045] The adjusting member 300 abuts between the positioning ring 112 and the first chain retainer 202. The adjusting member 300 can provide preload to the freewheel assembly 200 to prevent the freewheel assembly 200 from loosening during riding. In addition, the adjusting member 300 can also be used to adjust the axial distance of the freewheel assembly 200.
[0046] like Figure 12 As shown, in one embodiment of this application, the adjusting member 300 can be a shim.
[0047] like Figure 13 As shown, in another embodiment of this application, the adjusting member 300 can be a spring washer.
[0048] In other embodiments of this application, the adjusting member 300 may be a combination of a shim and a spring washer, and no specific limitation is made here.
[0049] Because the chainline positions differ for different speed frames, the axial position of the cassette 201 needs to be different. To be compatible with different speed frames, the axial position of the cassette 201 needs to be adjusted; the cassette assembly 200 itself has threads that allow for axial movement, and the only problem to solve is how to accurately position the axial position to meet the positional requirements of the chainline for different speeds.
[0050] This application uses shims and / or spring washers to adjust the axial position of the flywheel 201. The shim thickness for the 8-speed flywheel is defined as H8, and the shim thickness for other speed flywheels is defined as H. i Compared to the shim thickness H8 of an 8-speed cassette, the shim thickness H of other speed cassettes is... i The required increase (or decrease) in thickness is H, and the formula for calculating H is: ; The position of the flywheel in this application corresponds to the fifth gear position. Taking the fifth gear position of an 8-speed multi-speed flywheel as the initial position, the corresponding H positions for the fifth gear positions of 9-speed, 10-speed, and 11-speed flywheels are shown in Table 1 below:
[0051] like Figure 14 As shown, this application also provides a cycling trainer, including a cycling trainer body, on which a single-speed flywheel structure as described above is provided.
[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 this utility model.
Claims
1. A single-speed flywheel structure for a cycling trainer, characterized in that, include: A pulley assembly includes pulleys, and a connecting shaft is provided on the pulleys; The flywheel assembly is sleeved and connected to the connecting shaft; The flywheel assembly includes: A flywheel, wherein a first chain retainer plate and a second chain retainer plate are respectively provided on both sides of the flywheel; by rotating the first chain retainer plate and / or the second chain retainer plate to make the flywheel move closer to and / or away from the pulley, the axial position of the flywheel can be adjusted. An adjusting member is sleeved on the connecting shaft and located at the end of the flywheel near the pulley; the adjusting member is used to provide preload to the flywheel and to adjust the axial position of the flywheel.
2. The single-speed flywheel structure of the cycling train as described in claim 1, characterized in that, The connecting shaft extends outward from the center of the pulley, and the axial direction of the connecting shaft coincides with the axial direction of the pulley.
3. The single-speed flywheel structure of the cycling train as described in claim 2, characterized in that, The connecting shaft is a hollow structure with an open end. A locking nut is connected to the open end of the connecting shaft. The locking nut is used to lock and fix the flywheel assembly.
4. The single-speed flywheel structure of the cycling train as described in claim 1, characterized in that, The flywheel inner ring is provided with a first buckle groove, and the first chain retainer plate is provided with a first locking block that cooperates with the first buckle groove.
5. The single-speed flywheel structure of the cycling train as described in claim 1, characterized in that, The flywheel inner ring is provided with a second buckle groove, and the second chain retainer plate is provided with a second buckle block that cooperates with the second buckle groove.
6. The single-speed flywheel structure of the cycling train as described in claim 1, characterized in that, The corresponding surfaces of the first and second chain guide plates are respectively provided with chain guide surfaces.
7. The single-speed flywheel structure of the cycling train as described in claim 1, characterized in that, The adjusting element is a shim and / or a spring washer.
8. The single-speed flywheel structure of the cycling train as described in claim 7, characterized in that, The shim thickness for an 8-speed flywheel is defined as H8, and the shim thickness for other speed flywheels is defined as H. i Compared to the shim thickness H8 of an 8-speed cassette, the shim thickness H of other speed cassettes is... i The required increase (or decrease) in thickness is H, and the formula for calculating H is: ； M8 represents the thickness of the 8-speed flywheel; B8 represents the gear wall thickness of the 8-speed flywheel; δ8 represents the spacing between adjacent gears of the 8-speed flywheel; M i Indicates the thickness of the i-speed flywheel; B i Indicates the gear wall thickness of the i-speed flywheel; δ i This represents the spacing between adjacent teeth of the i-speed flywheel; i represents the flywheel speed, and i is a natural number ≥ 2.
9. The single-speed flywheel structure of the cycling train as described in claim 7, characterized in that, The end of the connecting shaft near the pulley is fitted with a protruding positioning ring, and the adjusting member abuts against the positioning ring.
10. A cycling trainer, comprising a cycling trainer body, characterized in that, The cycling train body is provided with a single-speed flywheel structure as described in any one of claims 1-9.