Chain wheel moving mechanism and bicycle

Abstract

According to the crankset moving mechanism and the bicycle, a movable shaft sleeve is arranged on a middle shaft, a crankset is arranged on the shaft sleeve, then the shaft sleeve can be driven by an electric driving unit to move along the middle shaft, the crankset can move along the middle shaft, and finally when a flywheel of the bicycle is subjected to gear change, the crankset can move along the middle shaft. The electric driving unit can be used for driving the chain wheel to carry out adaptive adjustment along with the gear change of the bicycle, so that the included angle between the chain and the chain wheel is effectively reduced, and the riding efficiency of a bicycle user is improved. In addition, due to the fact that the included angle is decreased, the meshing cut-in range of the chain and the teeth is wider, chain falling caused by returning can be reduced, asymmetric abrasion of the tooth parts is reduced, axial stress of the tooth parts is reduced, tooth deformation can be reduced, and the service life can be prolonged.

Description

Technical Field

[0001] This application relates to the field of bicycles, and in particular to a chainring movement mechanism and a bicycle. Background Technology

[0002] When shifting gears on a multi-speed bicycle, the change in the height of the freewheel causes a change in the angle between the chain and the freewheel (or the chain and the chainring). When this angle is not zero degrees, the driving force of the chain will be axially separated due to the angle, thus failing to maximize its use in driving the freewheel to rotate, resulting in energy waste. The larger the angle, the more energy is wasted, thereby affecting the cycling efficiency of the cyclist. Utility Model Content

[0003] This application aims to provide a chainring movement mechanism and a bicycle that can improve the riding efficiency of cyclists.

[0004] The toothed disc moving mechanism according to a first aspect embodiment of this application includes:

[0005] Bearing system;

[0006] The central axle is rotatably mounted on the frame via the bearing system;

[0007] A bushing is movably sleeved on the central shaft and located on the side of the central shaft near the toothed disc; the toothed disc is disposed on the bushing.

[0008] An electric drive unit is used to drive the bushing to move axially along the central shaft.

[0009] The bicycle according to a second aspect embodiment of this application includes a chainring movement mechanism as described in the first aspect embodiment.

[0010] The chainring movement mechanism and bicycle of this application embodiment, by setting a movable bushing on the bottom bracket and mounting the chainring on the bushing, allow the bushing to move along the bottom bracket via an electric drive unit. This enables the chainring to move along the bottom bracket. Ultimately, when the bicycle freewheel changes gears, the electric drive unit can adaptively adjust the chainring to follow the gear changes, effectively reducing the angle between the chain and the chainring, thereby improving the cyclist's riding efficiency. Furthermore, the smaller angle allows for a wider engagement range between the chain and teeth, reducing chain slippage, asymmetrical wear on the teeth, and axial stress on the teeth, thus minimizing tooth deformation and extending service life.

[0011] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this application. Attached Figure Description

[0012] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0013] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.

[0014] Figure 2 A schematic diagram illustrating the fit between the chainring and the freewheel in an embodiment of this application;

[0015] Figure 3 This is a schematic diagram of the overall structure of the toothed disc moving mechanism provided in the embodiments of this application;

[0016] Figure 4 A partial cross-sectional view of the toothed disc moving mechanism provided in an embodiment of this application;

[0017] Figure 5 An electrical system diagram of the toothed disc moving mechanism provided in the embodiments of this application.

[0018] Figure label:

[0019] First bearing 110; Second bearing 120; Axial locking structure 130; First locking plug 140; First sealing ring 150; Second locking plug 160; Second sealing ring 170; Central shaft 200; Bushing 300; Electric drive mechanism 410; Drive motor 411; Reducer 412; Electronic control module 413; Wireless communication module 414; Energy storage module 415; Drive screw 420; Moving part 430; Assembly seat 500; Frame 600; Chainring 700; Crank connecting shaft 800; Flywheel 900. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0022] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] In the description of this application, it should be noted that, unless otherwise explicitly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0024] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this application, not all embodiments.

[0025] To better describe the chainring movement mechanism and bicycle of the embodiments of this application, a brief description is given here of the change in the 70° angle between the chain and the chainring during the conventional bicycle gear shifting process. (Reference) Figure 1 , Figure 2 In traditional chainring structures, there is a large angle θ between the chain and the chainring 700. Because of this angle θ, an axial component of the chain's driving force cannot be used to drive the freewheel 900, resulting in energy waste. Understandably, the larger the angle θ, the more energy is wasted. This embodiment reduces energy waste by lowering the angle θ, thereby improving riding efficiency. Figure 2 As shown, Figure 2 The dashed rectangle can be understood as the position of the crankset before it moves, and the solid rectangle can be understood as the position of the crankset after it moves. The included angle after the movement is β, which is significantly smaller than the angle θ, thus effectively reducing the axial force component.

[0026] Based on the above scenario, the chainring movement mechanism and bicycle of the present application embodiment are described below.

[0027] See Figures 3 to 5 As shown, one embodiment of this application provides a toothed disc moving mechanism, which includes:

[0028] Bearing system;

[0029] The central axle 200 is rotatably mounted on the frame 600 via a bearing system;

[0030] The bushing 300 is movably sleeved on the central shaft 200 and located on the side of the central shaft 200 near the toothed plate 700; the toothed plate 700 is mounted on the bushing 300.

[0031] An electric drive unit is used to drive the bushing 300 to move axially along the central shaft 200.

[0032] In this embodiment, a movable bushing 300 is provided on the bottom bracket 200, and a chainring 700 is provided on the bushing 300. An electric drive unit can then drive the bushing 300 to move along the bottom bracket 200, thereby allowing the chainring 700 to move along the bottom bracket 200. Finally, when the bicycle freewheel 900 changes gears, the electric drive unit can drive the chainring 700 to adaptively adjust to the gear changes, effectively reducing the angle between the chain and the chainring 700, thus improving the cyclist's riding efficiency. Furthermore, the smaller angle allows for a wider engagement range between the chain and teeth, reducing chain slippage, asymmetrical wear on the teeth, and axial stress on the teeth, which helps reduce tooth deformation and extends service life.

[0033] The aforementioned bushing 300 is fitted onto the central shaft 200 and can move along the central shaft 200. After the crankcase 700 is fixed on the bushing 300, the crankcase 700 can be moved along the central shaft 200, thereby adjusting the relative position of the crankcase 700 and the central shaft 200.

[0034] The aforementioned central axle 200 is mounted on the frame 600 via a bearing system, allowing the bushing 300 to rotate along with the central axle 200.

[0035] The bottom bracket 200 can be equipped with crank connecting shafts 800 at both ends for connecting cranks. The bicycle user can rotate the bottom bracket 200 by rotating the crank, which in turn drives the bushing 300 to rotate.

[0036] The maximum range of movement of the aforementioned bushing 300 along the axial direction of the central shaft 200 can be adaptively adjusted according to the length of the central shaft 200. For details, please refer to... Figure 3 , Figure 4 The maximum travel distance can be constrained by the length of the central axle 200 and the position of the frame 600, or a separate limiting mechanism can be set to limit the travel range of the bushing 300.

[0037] The length of the aforementioned bushing 300 can be flexibly adjusted according to actual needs, for example, as... Figure 4 As shown, when the design length is long, the bushing 300 can be extended between the bearing system and the central shaft 200; when the design length is short, it does not need to extend between the bearing system and the central shaft 200, and the entire bushing remains outside the bearing system. It should be noted that both the length and the length of the bushing 300 have their advantages. When the demand for the movement drive of the sprocket 700 is relatively small, a shorter bushing 300 can be considered.

[0038] In some scenarios, the length of the aforementioned bushing 300 can be set to 1.2 to 3 times the travel of the chainring 700.

[0039] The aforementioned electric drive unit can drive the bushing 300 to move, thereby adjusting the relative position of the chainring 700 and the bottom bracket 200, thereby adjusting the relative position between the chainring 700 and the freewheel 900, and thus adjusting the angle between the chain and the chainring 700.

[0040] The aforementioned electric drive unit can be installed inside or outside the central shaft 200. The specific installation position can be flexibly adjusted according to actual needs, so as to enable the drive shaft sleeve 300 to move.

[0041] The electric drive unit can be connected to an external manual operation device to enable direct manual control of its operation. The position of the drive bushing 300 can be adjusted by the user based on their riding experience. Alternatively, an electronic control module 413 can be installed in the electric drive unit to automatically adjust the position of the bushing 300 so that the chainring 700 and the freewheel 900 are always in a better relative position.

[0042] Because the aforementioned electric drive unit is an actively adjusting mechanism, it can also restrict the movement of the bushing 300. That is, the bushing 300 will not move passively due to the traction of the chain, thus improving the stability of riding.

[0043] In some embodiments, a mounting cavity is provided axially inside the central shaft 200, and a first keyway communicating with the mounting cavity is provided on the outer peripheral wall of the central shaft 200.

[0044] The electric drive unit includes components all housed within the mounting cavity:

[0045] The electric drive mechanism 410 is located on the side of the mounting cavity away from the gear plate 700;

[0046] The drive screw 420 is located in the mounting cavity on the side near the gear plate 700, and one end of the drive screw 420 is connected to the electric drive mechanism 410.

[0047] The movable part 430 is threadedly connected to the drive screw 420, and the movable part 430 is connected to the bushing 300 and / or the gear plate 700 through the first keyway; the electric drive mechanism 410 is used to drive the drive screw 420 to rotate so as to drive the movable part 430 to move axially along the central shaft 200, so as to move the bushing 300 along the central shaft 200.

[0048] The aforementioned central shaft 200 has an axially arranged mounting cavity, which can be used to house an electric drive unit.

[0049] The aforementioned central shaft 200 is provided with crank connecting shafts 800 at both ends. A through hole is provided on the crank connecting shaft 800 on the side away from the bushing 300 along the axial direction of the central shaft 200 to communicate with the mounting cavity. A terminal block electrically connected to the electric drive unit can be provided in the through hole to facilitate subsequent charging and / or data transmission operations of the electric drive unit.

[0050] The aforementioned mounting cavity can be divided into two chambers. The first chamber is located away from the bushing 300, and the second chamber is located close to the bushing 300. An electric drive mechanism 410 can be installed in the first chamber, and a drive screw 420 and a moving part 430 can be installed in the second chamber, thereby achieving the separation of the electrical components and reducing the possibility of external damage to the electrical components during use.

[0051] A first keyway is provided on the outer peripheral wall of the central shaft 200 near the bushing 300. The first keyway connects to the mounting cavity. The first keyway can be elongated, with its length aligned with the axial direction of the central shaft 200, to facilitate the connection between the movable component 430 and the bushing 300, and also to allow the movable component 430 to slide along the first keyway. Simultaneously, the first keyway effectively prevents relative rotation between the bushing 300 and the central shaft 200.

[0052] Multiple first keyways can be formed on the outer peripheral wall of the central shaft 200 near the bushing 300. Providing multiple first keyways increases the stability between the moving part 430 and the bushing 300. For example... Figure 4 As shown, the central shaft 200 has two first keyways, and the upper and lower parts of the inner wall of the bushing 300 are connected to the moving part 430 through the first keyways.

[0053] The electric drive mechanism 410 is located on one side of the mounting cavity, and the moving part 430 is located on the other side of the mounting cavity. The electric drive mechanism 410 and the moving part 430 are connected by a drive screw 420, so that the electric drive mechanism 410 can drive the moving part 430 to move axially along the central shaft 200 through the drive screw 420, and then drive the bushing 300 and / or the gear plate 700 to move through the moving part 430.

[0054] The aforementioned movable component 430 can be a nut or other base with a screw hole structure.

[0055] In this embodiment, the electric drive mechanism 410 drives the lead screw 420 to rotate, which in turn drives the moving part 430 to move axially along the central shaft 200, thereby adjusting the position of the bushing 300 and achieving the purpose of adjusting the relative position of the chainring 700 and the freewheel 900. Furthermore, the electric drive mechanism 410 allows for precise control of the movement of the bushing 300, and also restricts its movement, preventing it from moving passively under the traction of the chain, thus improving riding stability.

[0056] In some implementations, reference Figure 4 , Figure 5 The electric drive mechanism 410 includes:

[0057] The drive motor 411 is located inside the mounting cavity;

[0058] The reducer 412 is installed in the mounting cavity and located between the drive motor 411 and the gear sprocket 700. The reducer 412 is used to drive the drive screw 420 to rotate.

[0059] The aforementioned drive motor 411, reducer 412, and drive screw 420 are sequentially arranged inside the mounting cavity.

[0060] The aforementioned drive motor 411 can be connected to an external control device via a through hole on the crank connecting shaft 800, allowing the external control device to control the drive motor 411. Alternatively, the drive motor 411 can be controlled via an electronic control module 413 located within the mounting cavity. The specific control method chosen depends on the actual application requirements.

[0061] The aforementioned reducer 412 can provide a larger torque to improve the driving capability of the drive screw 420.

[0062] In some implementations, reference Figure 4 , Figure 5 The electric drive mechanism 410 also includes:

[0063] The electronic control module 413 is located inside the mounting cavity and is electrically connected to the drive motor 411;

[0064] The wireless communication module 414 is disposed in the mounting cavity and is electrically connected to the electronic control module 413;

[0065] The energy storage module 415 is located inside the mounting cavity and is used to supply power to the electronic control module 413, the wireless communication module 414 and the drive motor 411.

[0066] The aforementioned wireless communication module 414 can achieve wireless communication with the outside world, and thus obtain the current gear information of the bicycle flywheel 900 through wireless communication, and can also transmit the current relative position of the chainring 700 to the outside world through the wireless communication module 414.

[0067] The wireless communication module 414 mentioned above can be a Bluetooth, WIFI or other wireless communication module 414. The specific choice can be made according to the actual needs.

[0068] The aforementioned electronic control module 413 can achieve local control. When it obtains the current gear information of the bicycle freewheel 900, it can automatically control the drive motor 411 to operate according to the change of gear information, so as to adjust the relative position of the chainring 700 and minimize the angle between the chainring 700 and the chain.

[0069] The aforementioned energy storage module 415 can directly use a lithium battery. By using the energy storage module 415, the operation of the electronic control module 413, wireless communication module 414, and drive motor 411 no longer needs to rely on an external power source, thereby reducing or even eliminating fixed wiring, improving the applicability of the crankset movement mechanism, and reducing the installation difficulty of the crankset movement mechanism.

[0070] In some implementations, the speed reducer 412, drive motor 411, electronic control module 413, wireless communication module 414, and energy storage module 415 can be configured as a single motor assembly. This assembly-type structure allows for quick installation and subsequent maintenance.

[0071] In some embodiments, the electric drive mechanism 410 further includes a display unit connected to the electronic control module 413, the display unit being mounted on the frame 600.

[0072] In this embodiment, the display unit facilitates the rider's adjustment of the chainring position and allows the rider to understand the current position of the chainring.

[0073] In some embodiments, the bearing system includes:

[0074] The first bearing 110 is used to rotatably set the central shaft 200 and is located on the side of the central shaft 200 away from the chainring 700; the first bearing 110 is also used to restrict the axial movement of the central shaft 200.

[0075] In this embodiment, the rotation setting of the central shaft 200 can be achieved using the first bearing 110, thus satisfying the rotation requirements of the central shaft 200. Simultaneously, in this embodiment, the first bearing 110 has a limiting capability, ensuring that the central shaft 200 does not move when the drive bushing 300 moves.

[0076] When the aforementioned first bearing 110 is used to restrict the axial movement of the central shaft 200, it can be engaged by setting a limiting protrusion on the central shaft 200, such as... Figure 4 As shown, a limiting protrusion is provided on the outer peripheral wall of the central shaft 200 near the bushing 300 of the first bearing 110 to provide directional restriction. Simultaneously, an axial locking structure 130 is provided on the first bearing 110 away from the bushing 300 to restrict the first bearing 110 in another direction. This completes the restriction on the axial movement of the central shaft 200. A first locking plug 140 is provided on the frame 600 or assembly seat 500 at the location of the first bearing 110 away from the bushing 300 to fix the first bearing 110.

[0077] The aforementioned axial locking structure 130 can be directly fitted with an axial locking nut.

[0078] After the axial locking structure 130 is installed, if there is a gap between it and the frame 600, a first sealing ring 150 can be added for sealing.

[0079] In some embodiments, the first bearing 110 may be a ball bearing.

[0080] In this embodiment, the ball bearing's strong axial bearing capacity can better withstand the axial force of the movement of the crank 700, and the ball bearing can better fix the central shaft 200.

[0081] In some embodiments, the bearing system further includes:

[0082] The second bearing 120 is located near the gear sprocket 700 and is used to rotate the bushing 300.

[0083] In this embodiment, the bushing 300 is designed to extend between the central axle 200 and the frame 600. In order to reduce the friction between the bushing 300 and the frame 600, a second bearing 120 is provided so that the bushing 300 can rotate more smoothly.

[0084] In some embodiments, the second bearing 120 is a needle roller bearing.

[0085] In this embodiment, the second bearing 120 is selected as a needle roller bearing, which can better improve the rotation and movement of the bushing 300.

[0086] In some embodiments, the second bearing 120 may also be a ball bearing or a combination of multiple ball bearings.

[0087] In some embodiments, a second locking plug 160 can be provided on the frame 600 or assembly seat 500 near the chainring 700 to secure the needle roller bearing. Furthermore, if there is a gap between the second bearing 120 and the frame 600 after installation, a second sealing ring 170 can be added to seal it.

[0088] In some embodiments, a second keyway is provided on the outer peripheral wall of the central shaft 200, which is arranged axially along the central shaft 200, and a sliding key is provided on the inner peripheral wall of the bushing 300, which can slide along the second keyway.

[0089] The aforementioned second keyway can restrict the sliding direction of the sliding key, making the movement of the bushing 300 smoother, and at the same time, it can also provide a certain degree of restriction on the bushing 300's circumferential rotation along the central axis 200.

[0090] In some implementations, the second keyway and the first keyway can be the same keyway, and the usage requirements can be met by setting the keyway to an appropriate length.

[0091] In some embodiments, the above-mentioned toothed disc moving mechanism further includes:

[0092] Assembly seat 500 is detachably mounted in the frame 600, and the bearing system is mounted in the assembly seat 500.

[0093] In this embodiment, by setting the bearing system in the assembly base 500, the entire chainring movement mechanism can be set as an assembly structure. This allows for quick installation and replacement of the entire chainring movement mechanism through the assembly base 500, providing users with a better user experience.

[0094] This application also provides a bicycle that includes the chainring movement mechanism as described above. Because the bicycle has the chainring movement mechanism, it possesses all the beneficial effects of such a mechanism.

[0095] The above are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A toothed disc moving mechanism, characterized in that, include: Bearing system; The central axle is rotatably mounted on the frame via the bearing system; A bushing is movably sleeved on the central shaft and located on the side of the central shaft near the toothed disc; the toothed disc is disposed on the bushing. An electric drive unit is used to drive the bushing to move axially along the central shaft.

2. The toothed disc moving mechanism according to claim 1, characterized in that, The central shaft has an axially arranged mounting cavity, and the outer peripheral wall of the central shaft has a first keyway communicating with the mounting cavity. The electric drive unit comprises components all disposed within the mounting cavity: An electric drive mechanism is located on the side of the mounting cavity away from the dental disc; A drive screw is located inside the mounting cavity on the side near the gear plate, and one end of the drive screw is connected to the electric drive mechanism; A movable component is threadedly connected to the drive screw, and the movable component is connected to the bushing and / or the gear sprocket via the first keyway; the electric drive mechanism is used to drive the drive screw to rotate so as to move the movable component axially along the central axis, so as to move the bushing along the central axis.

3. The toothed disc moving mechanism according to claim 2, characterized in that, The electric drive mechanism includes: A drive motor is disposed within the mounting cavity; A speed reducer is disposed within the mounting cavity and located between the drive motor and the gear sprocket. The speed reducer is used to drive the drive screw to rotate.

4. The toothed disc moving mechanism according to claim 3, characterized in that, The electric drive mechanism further includes: An electronic control module is disposed within the mounting cavity and is electrically connected to the drive motor; A wireless communication module is disposed within the mounting cavity and is electrically connected to the electronic control module; An energy storage module is disposed within the mounting cavity and is used to supply power to the electronic control module, the wireless communication module, and the drive motor.

5. The toothed disc moving mechanism according to claim 1, characterized in that, The bearing system includes: A first bearing is used to rotatably set the central shaft and is located on the side of the central shaft away from the chainring; the first bearing is also used to restrict axial movement of the central shaft.

6. The toothed disc moving mechanism according to claim 5, characterized in that, The bearing system also includes: The second bearing, located near the toothed disc, is used to rotate the bushing.

7. The toothed disc moving mechanism according to claim 6, characterized in that, The second bearing is a needle roller bearing.

8. The toothed disc moving mechanism according to claim 1, characterized in that, A second keyway is provided on the outer peripheral wall of the central shaft along the central shaft axis, and a sliding key is provided on the inner peripheral wall of the bushing, the sliding key being able to slide along the second keyway.

9. The toothed disc moving mechanism according to claim 1, characterized in that, Also includes: An assembly mount for detachable installation in the vehicle frame, wherein the bearing system is disposed in the assembly mount.

10. A bicycle, characterized in that, Includes the toothed disc moving mechanism as described in any one of claims 1 to 9.

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