Anti-backlash chainring and bicycle

Abstract

This application discloses an anti-backlash chainring device and a bicycle, including a bottom bracket, an overrunning clutch, a bushing, a chainring, and a drive mechanism. The bottom bracket is rotatably mounted on the frame, the overrunning clutch is mounted on the outer peripheral wall of the bottom bracket, the bushing is sleeved on the outside of the bottom bracket and connected to the overrunning clutch, and the bushing can move axially along the bottom bracket. The chainring is mounted on the bushing, and the drive mechanism is mounted on the outside of the bottom bracket. The drive mechanism includes a lead screw, a nut, and a drive unit. The lead screw extends axially along the bottom bracket and can slide axially along the bottom bracket. The bushing and / or the chainring are rotatably connected to the lead screw. The nut can rotate around its own axis and is threadedly connected to the lead screw. The drive unit is drively connected to the nut to drive the nut to rotate. The anti-backlash chainring device and bicycle of this application can not only improve the rider's riding efficiency but also reduce chain slippage, asymmetrical wear of the teeth, and tooth deformation, thereby improving the rider's riding experience and extending the service life of the bicycle.

Description

Technical Field

[0001] This application relates to the field of bicycle technology, and in particular to an anti-backward chainring device and a bicycle. Background Technology

[0002] With the iterative upgrades of bicycle gear systems, the following drawbacks of traditional gear systems have been discovered: When riders shift gears, the chain moves between different levels on the sprocket. When the end of the chain that wraps around the sprocket is not parallel to the end that wraps around the chainring and forms an angle, it causes the chain to be pulled at an angle. This results in the chain's driving force being ineffectively dissipated in the axial direction of the bottom bracket, significantly weakening the chain's transmission efficiency and affecting the rider's riding efficiency. In addition, the chain being pulled at an angle can also easily lead to uneven shifting, chain slippage, asymmetrical wear of the teeth, and tooth deformation. This not only affects the rider's riding experience but also reduces the lifespan of the bicycle. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an anti-reverse chainring device, which not only improves the rider's riding efficiency but also reduces chain slippage, asymmetrical wear of the teeth, and tooth deformation, thereby improving the rider's riding experience and extending the bicycle's lifespan.

[0004] This application also proposes a bicycle having the aforementioned anti-backward crankset device.

[0005] According to an embodiment of the first aspect of this application, an anti-backlash crankset device includes a bottom bracket, an overrunning clutch, a bushing, a crankset, and a drive mechanism. The bottom bracket is rotatably mounted on the frame. The overrunning clutch is mounted on the outer peripheral wall of the bottom bracket. The bushing is sleeved on the outside of the bottom bracket and connected to the overrunning clutch. The bushing is axially movable along the bottom bracket. The crankset is disposed on the bushing. The drive mechanism is mounted on the outside of the bottom bracket. The drive mechanism includes a lead screw, a nut, and a drive unit. The lead screw extends axially along the bottom bracket and is slidable axially along the bottom bracket. The bushing and / or the crankset are rotatably connected to the lead screw. The nut is rotatable about its own axis and is threadedly connected to the lead screw. The drive unit is drively connected to the nut to drive the nut to rotate.

[0006] The anti-reverse crank plate device according to the embodiments of this application has at least the following beneficial effects:

[0007] In this application, the bushing is mounted on the bottom bracket via an overrunning clutch. The bushing can move axially along the bottom bracket. A chainring is mounted on the bushing. When the bicycle freewheel shifts gears, the drive unit rotates the nut. The nut, through a threaded connection with a lead screw, drives the lead screw to slide axially along the bottom bracket. The lead screw then drives the bushing to slide axially along the bottom bracket, thereby causing the chainring to move axially along the bottom bracket. This allows the chainring to adaptively adjust its position according to the bicycle's gear changes, effectively reducing the angle between the chain and the chainring, and between the chain and the freewheel, thus improving the rider's riding efficiency. Furthermore, because the angle is smaller, the meshing range between the chain and the chainring or freewheel teeth is wider, reducing chain slippage, asymmetrical wear on the teeth, and axial stress on the teeth, which helps reduce tooth deformation and extends service life. Furthermore, in this application, the drive unit actively drives the bushing to move through the cooperation of the nut and the lead screw. Compared to shifting gears via the chain driving the chainring, the chainring movement in this application is smoother and more precise, reducing the occurrence of jamming. Moreover, once it reaches the corresponding position, it will not move randomly, improving riding stability. At the same time, even if the bushing is subjected to axial impact, it is less likely to affect or damage the drive unit. In addition, the bushing is installed on the bottom bracket via an overrunning clutch. The overrunning clutch has a one-way transmission function. When the rider pedals forward, driving the bottom bracket to rotate in one direction, the overrunning clutch is engaged, and the bottom bracket can drive the bushing and chainring to rotate through the overrunning clutch, which in turn drives the chain to move. When the rider pedals backward, driving the bottom bracket to rotate in the opposite direction, the overrunning clutch is disengaged, and the bottom bracket cannot drive the bushing and chainring to rotate through the overrunning clutch, thus avoiding the problem of chain slippage.

[0008] According to some embodiments of this application, the anti-backward crankset device further includes an assembly base for mounting on the frame, the assembly base having mounting holes in which the bottom bracket is rotatably mounted.

[0009] According to some embodiments of this application, the anti-reverse crankset device further includes a first bearing and a second bearing, the first bearing being installed at the end of the mounting hole away from the crankset, the second bearing being installed at the end of the mounting hole near the crankset, and the central shaft being rotatably installed within the first bearing and the second bearing.

[0010] According to some embodiments of this application, the lead screw is slidably installed in the mounting hole, the lead screw is provided with a sleeve hole that extends axially, and is sleeved on the outside of the central shaft through the sleeve hole.

[0011] According to some embodiments of this application, the wall of the sleeve hole is fitted to the outer peripheral wall of the second bearing.

[0012] According to some embodiments of this application, an anti-rotation part is provided between the assembly seat and the lead screw, the anti-rotation part being used to restrict the lead screw from rotating about its own axis.

[0013] According to some embodiments of this application, the nut is configured as a worm gear nut, the drive unit includes a worm and a drive motor, the worm meshes with the worm gear nut, and the drive motor is drivenly connected to the worm to drive the worm to rotate; and / or, the nut is rotatably mounted on the assembly seat or the frame, and the drive unit is mounted on the assembly seat or the frame.

[0014] According to some embodiments of this application, the anti-reverse crank plate device further includes a third bearing, which is disposed on the bushing and / or the crank plate and coaxial with the bushing. The third bearing is connected to the lead screw, and the bushing rotates relative to the lead screw through the third bearing.

[0015] According to some embodiments of this application, the overrunning clutch is axially slidable along the central shaft.

[0016] The bicycle according to a second aspect of this application includes the anti-backward chainring device described in the first aspect of the embodiment.

[0017] The bicycle according to the embodiments of this application has at least the following beneficial effects:

[0018] The anti-backlash chainring device according to the first aspect of this application not only improves the rider's riding efficiency but also reduces chain slippage, asymmetrical tooth wear, and tooth deformation, thereby enhancing the rider's riding experience and extending the bicycle's lifespan. Furthermore, in this application, the drive unit actively drives the bushing to move via the cooperation of a nut and a lead screw. Compared to shifting gears via a chain-driven chainring, the chainring movement in this application is smoother and more precise, reducing the occurrence of jamming. Moreover, once it reaches the corresponding position, it will not move arbitrarily, improving riding stability. Additionally, even if the bushing is subjected to axial impact, it is less likely to damage the drive unit. In addition, the bushing is mounted on the bottom bracket via an overrunning clutch. The overrunning clutch has a one-way transmission function. When the rider pedals forward and drives the bottom bracket to rotate in one direction, the overrunning clutch is engaged, and the bottom bracket can drive the bushing and chainring to rotate through the overrunning clutch. In turn, the chainring can drive the chain to move. When the rider pedals backward and drives the bottom bracket to rotate in the opposite direction, the overrunning clutch is disengaged, and the bottom bracket cannot drive the bushing and chainring to rotate through the overrunning clutch. This can prevent the chain from falling off due to backlash.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.

[0022] Figure 2 This is a schematic diagram illustrating the fit between the chainring and the freewheel in this application;

[0023] Figure 3 This is a schematic diagram of the overall structure of the anti-reverse tooth plate device of this application;

[0024] Figure 4 This is a partial cross-sectional view of the anti-reverse toothed disc device of this application.

[0025] Icon labels:

[0026] Central axis 100; Keyway 101;

[0027] Bushing 200;

[0028] Crankset 300;

[0029] Drive mechanism 400; lead screw 401; nut 402; drive unit 403; drive motor 404; reducer 405; guide groove 406; worm gear 407; fourth bearing 408;

[0030] Assembly base 500; mounting hole 501; anti-rotation part 502;

[0031] First bearing 600;

[0032] Second bearing 700;

[0033] Third bearing 800;

[0034] Overrunning clutch 900; key structure 901;

[0035] Frame 1000;

[0036] Flywheel 1100. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these 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.

[0038] 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.

[0039] In the description of this application, "multiple" refers to two or more. The use of "first" and "second" 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 in which the technical features are indicated.

[0040] In the description of this application, unless otherwise expressly 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.

[0041] To better describe the anti-backward chainring device and bicycle of the embodiments of this application, a brief description is given here of the change in the 300° angle between the chain and the chainring during conventional bicycle gear shifting. (Reference) Figure 1 When the chain is in the highest gear position on the cassette 1100, i.e., the highest gear ratio, there is a large angle θ between the chain and the chainring 300. Because of this angle θ, a large axial component of the chain's driving force cannot be used to drive the cassette 1100 to rotate, 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. (Refer to...) Figure 2 , Figure 2 The dashed rectangle can be understood as the position of the crankset 300 before it moves, and the solid rectangle can be understood as the position of the crankset 300 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.

[0042] The following is for reference. Figure 3 and Figure 4 This application describes an anti-backward crankset device and a bicycle according to embodiments thereof.

[0043] like Figure 3 and Figure 4 As shown, the anti-reverse crankset device according to the first aspect of this application includes a central shaft 100, a bushing 200, a crankset 300, a drive mechanism 400, and an overrunning clutch 900.

[0044] The central axle 100 is rotatably mounted on the frame 1000. The overrunning clutch 900 is mounted on the central axle 100. The bushing 200 is sleeved on the central axle 100 and connected to the overrunning clutch 900. The bushing 200 can move along the axial direction of the central axle 100. The sprocket 300 is disposed on the bushing 200. The drive mechanism 400 is mounted on the outside of the central axle 100. The drive mechanism 400 includes a lead screw 401, a nut 402 and a drive unit 403. The lead screw 401 extends along the axial direction of the central axle 100 and can slide along the axial direction of the central axle 100. The bushing 200 and / or the sprocket 300 are rotatably connected to the lead screw 401. The nut 402 can rotate around its own axis. The nut 402 is threadedly connected to the lead screw 401. The drive unit 403 is drively connected to the nut 402 to drive the nut 402 to rotate.

[0045] For example, the bottom bracket 100 can be mounted on the frame 1000 via the assembly mount 500. Specifically, the assembly mount 500 can be equipped with a bearing system, and the bottom bracket 100 is mounted on the bearing system to enable the bottom bracket 100 to rotate. In addition, crank connecting shafts can be provided at both ends of the bottom bracket 100 for connecting cranks. The cranks are used to mount pedals, and the rider rotates the cranks by pedaling, thereby driving the bottom bracket 100 to rotate.

[0046] The overrunning clutch 900 can have its inner ring fitted onto the outside of the bottom bracket 100, or it can be installed on the bottom bracket 100 in other ways. The inner ring of the overrunning clutch 900 can be fixed relative to the bottom bracket 100 in the circumferential direction. The overrunning clutch 900 is used for unidirectional transmission, that is, for transmitting torque in one direction. The overrunning clutch 900 is a common component in bicycle gear systems, and its structure and working principle will not be described in detail here.

[0047] The bushing 200 is fitted on the outside of the central shaft 100 and connected to the overrunning clutch 900. The bushing 200 can move along the axial direction of the central shaft 100. After the sprocket 300 is fixed on the bushing 200, the sprocket 300 can be moved along the axial direction of the central shaft 100, thereby adjusting the relative position of the sprocket 300 and the central shaft 100.

[0048] Because the overrunning clutch 900 is a one-way drive, when the rider is pedaling and driving the bottom bracket 100 to rotate in one direction, the overrunning clutch 900 is engaged, and the bottom bracket 100 can drive the bushing 200 and the chainring 300 to rotate through the overrunning clutch 900, which in turn can drive the chain to move. However, when the rider is pedaling in the opposite direction and driving the bottom bracket 100 to rotate in the opposite direction, the overrunning clutch 900 is disengaged, and the bottom bracket 100 cannot drive the bushing 200 and the chainring 300 to rotate through the overrunning clutch 900.

[0049] The drive mechanism 400 is mounted on the outside of the bottom bracket 100. The drive mechanism 400 includes a lead screw 401, a nut 402, and a drive unit 403. The lead screw 401 can be mounted on the assembly seat 500 or on the frame 1000. The lead screw 401 can extend along the axial direction of the bottom bracket 100 and slide along the axial direction of the bottom bracket 100. The lead screw 401 cannot rotate around its own axis. It can be that the bushing 200 is rotatably connected to the end of the lead screw 401 near the chainring 300, or the chainring 300 is rotatably connected to the end of the lead screw 401 near the chainring 300, or both the bushing 200 and the chainring 300 are rotatably connected to the end of the lead screw 401 near the chainring 300. Nut 402 can be rotatably mounted on assembly seat 500 or frame 1000. Nut 402 has a threaded hole and is threadedly connected to lead screw 401 through the threaded hole. Drive unit 403 can be mounted on assembly seat 500 or frame 1000. Drive unit 403 is drively connected to nut 402 to drive nut 402 to rotate. Drive unit 403 drives nut 402 to rotate. Since lead screw 401 cannot rotate around its own axis, nut 402, through its threaded connection with lead screw 401, can drive lead screw 401 to move. Lead screw 401 then drives bushing 200 to move axially along central shaft 100, thereby driving chainring 300 to move axially along central shaft 100.

[0050] In this application, the bushing 200 is mounted on the bottom bracket 100 via an overrunning clutch 900. The bushing 200 can move axially along the bottom bracket 100. A chainring 300 is provided on the bushing 200. When the bicycle freewheel 1100 shifts gears, the drive unit 403 drives the nut 402 to rotate. The nut 402 is threadedly connected to the lead screw 401, which in turn drives the lead screw 401 to move. The lead screw 401 then drives the bushing 200 to move axially along the bottom bracket 100, thereby driving the chainring 300 to move axially along the bottom bracket 100. This allows the chainring 300 to adaptively adjust its position according to the changes in bicycle gears, effectively reducing the angle between the chain and the chainring 300 and the angle between the chain and the freewheel 1100, thereby improving the rider's riding efficiency. In addition, because the included angle is smaller, the meshing range between the chain and the teeth of the chainring 300 or freewheel 1100 is wider, which can reduce chain slippage, reduce asymmetrical wear of the teeth, reduce axial force on the teeth, and help reduce tooth deformation, thereby extending service life.

[0051] Furthermore, compared to the chain-driven movement of the chainring 300 during gear shifting in the 1100 freewheel, in this application, the drive unit 403 actively drives the bushing 200 to move through the cooperation of the nut 402 and the lead screw 401. This not only makes the movement of the chainring 300 smoother and more precise, reducing the occurrence of jamming, but also allows the drive mechanism 400 to restrict the movement of the bushing 200 after it moves to the corresponding position. That is, the bushing 200 will not move passively due to the traction of the chain, thus improving the stability of riding.

[0052] Furthermore, since the drive unit 403 indirectly drives the bushing 200 to move through the cooperation of the nut 402 and the lead screw 401, even if the bushing 200 is subjected to an axial collision, such as a fall causing the chainring 300 to collide with a stone, when the stone exerts an axial force on the chainring 300, the axial force is not easily transmitted to the drive unit 403 and thus does not affect or even damage the drive unit 403.

[0053] Furthermore, because the overrunning clutch 900 has a one-way transmission function, when the rider pedals forward and drives the bottom bracket 100 to rotate in one direction, the overrunning clutch 900 is engaged, and the bottom bracket 100 can drive the bushing 200 and the chainring 300 to rotate through the overrunning clutch 900. In turn, the chainring 300 can drive the chain to move. When the rider pedals backward and drives the bottom bracket 100 to rotate in the opposite direction, the overrunning clutch 900 is disengaged, and the bottom bracket 100 cannot drive the bushing 200 and the chainring 300 to rotate through the overrunning clutch 900. This can avoid the problem of backtracking and chain drop, making it more practical.

[0054] It should be noted that the chainring 300 can stop at multiple gears when it moves along the axial direction of the central shaft 100, for example, it can be three. The gears of the chainrings on both sides can correspond to multiple gears on both sides of the freewheel 1100, and the gears of the chainring in the middle can correspond to multiple gears in the middle of the freewheel 1100.

[0055] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the anti-backward crankset device also includes an assembly seat 500, which is used to mount the frame 1000. The assembly seat 500 is provided with a mounting hole 501, and the central shaft 100 is rotatably mounted in the mounting hole 501.

[0056] For example, the assembly base 500 may be detachably mounted on the frame 1000, such as by snapping onto the frame 1000 or by fasteners. The assembly base 500 has a horizontally extending mounting hole 501, with both ends of the mounting hole 501 extending through it. The central shaft 100 may be mounted within the mounting hole 501 via a bearing system, allowing the central shaft 100 to rotate.

[0057] In this embodiment, the central shaft 100 is installed in the assembly seat 500 to form an assembly structure, which makes installation and replacement more convenient and provides users with a better user experience.

[0058] In some embodiments of this application, such as Figure 4 As shown, the anti-reverse crankset device also includes a first bearing 600 and a second bearing 700. The first bearing 600 is installed at the end of the mounting hole 501 away from the crankset 300, and the second bearing 700 is installed at the end of the mounting hole 501 close to the crankset 300. The central shaft 100 is rotatably installed in the first bearing 600 and the second bearing 700.

[0059] In this embodiment, the rotation setting of the central shaft 100 can be achieved by using the first bearing 600 and the second bearing 700, which satisfies the rotation requirements of the central shaft 100 and makes the rotation of the central shaft 100 smoother.

[0060] In some embodiments of this application, such as Figure 4 As shown, the lead screw 401 is slidably installed in the mounting hole 501. The lead screw 401 has a sleeve hole that extends axially and is sleeved on the outside of the central shaft 100 through the sleeve hole. That is, the lead screw 401 is sleeve-shaped and sleeved on the outside of the central shaft 100. In this embodiment, this arrangement not only makes assembly more convenient, but also makes the force more even and improves its practicality.

[0061] It should be noted that in some embodiments of this application, the lead screw 401 may not be a sleeve, but a solid rod. The lead screw 401 can be located on one side of the central shaft 100, which will not be elaborated here.

[0062] In some embodiments of this application, such as Figure 4 As shown, the inner peripheral wall of the lead screw 401 is fitted to the outer peripheral wall of the second bearing 700. In this embodiment, this arrangement not only makes the lead screw 401 more securely installed, but also reduces the resistance encountered when the lead screw 401 slides, and further makes the central shaft 100 more securely installed.

[0063] In some embodiments of this application, the first bearing 600 may be a ball bearing. In this embodiment, the ball bearing's strong axial bearing capacity can better withstand the axial force when the crankset 300 moves, and the ball bearing can also better fix the central shaft 100.

[0064] It should be noted that the first bearing 600 can also be other suitable types of bearings, which will not be elaborated here.

[0065] In some embodiments of this application, such as Figure 4 As shown, the second bearing 700 is configured as a needle roller bearing. For example, the second bearing 700 may be a needle roller bearing without an inner ring.

[0066] In this embodiment, the second bearing 700 is configured as a needle roller bearing. The inner and outer rings of the needle roller bearing can move relative to each other along the axial direction. Even if the inner peripheral wall of the lead screw 401 is pressed against the outer peripheral wall of the second bearing 700, the lead screw 401 can still move along the axial direction of the central shaft 100. Moreover, it can reduce the axial friction force on the lead screw 401, making the axial movement of the lead screw 401 along the central shaft 100 smoother, and the gear shifting of the gear sprocket 300 smoother.

[0067] It should be noted that the second bearing 700 can also be other suitable types of bearings, such as roller bearings, which will not be elaborated here.

[0068] In some embodiments of this application, such as Figure 4 As shown, an anti-rotation part 502 is provided between the assembly seat 500 and the lead screw 401. The anti-rotation part 502 is used to restrict the lead screw 401 from rotating around its own axis. For example, the outer peripheral wall of the lead screw 401 may be provided with a guide groove 406, which extends along the axial direction of the lead screw 401. The anti-rotation part 502 can be inserted into the guide groove 406 and slide relative to the guide groove 406.

[0069] In this embodiment, an anti-rotation part 502 is provided to prevent the lead screw 401 from rotating arbitrarily and affecting the effect of the nut 402 driving the lead screw 401 to move axially along the central shaft 100.

[0070] It is understandable that the lead screw 401 may only have external threads in some positions. For example, the position where the guide groove 406 is provided may not have external threads.

[0071] In some embodiments of this application, such as Figure 4 As shown, nut 402 is mounted on assembly base 500 or frame 1000, and drive unit 403 is mounted on assembly base 500 or frame 1000. In this embodiment, nut 402 and drive unit 403 can be mounted on assembly base 500, thereby making the chainring assembly more of a unified assembly structure, which is more convenient for assembly. Of course, nut 402 and drive unit 403 can also be mounted on frame 1000, which is more convenient for installation and wiring.

[0072] It should be noted that nut 402 can be mounted on assembly seat 500 or frame 1000 via fourth bearing 408 to make nut 402 rotate more smoothly.

[0073] In some embodiments of this application, such as Figure 4 As shown, nut 402 is configured as a worm gear nut, and drive unit 403 includes worm 407 and drive motor 404. Worm 407 meshes with worm gear nut, and drive motor 404 is connected to worm 407 to drive worm 407 to rotate.

[0074] For example, a worm gear nut is formed by creating an internal thread on the inner circumferential wall of a common worm gear. The drive unit 403 may also include a reducer 405. Both the drive motor 404 and the reducer 405 can be mounted on the assembly base 500 or the frame 1000. The worm 407 can be rotatably mounted on the assembly base 500 or the frame 1000. The output end of the drive motor 404 is connected to the input end of the reducer 405, and the output end of the reducer 405 is connected to the worm 407. The drive motor 404 drives the worm 407 to rotate via the reducer 405. The worm 407 drives the worm gear nut to rotate through meshing with it, thereby driving the lead screw 401 to move axially along the central shaft 100.

[0075] In this embodiment, the nut 402 is configured as a worm gear nut, and the drive unit 403 drives the nut 402 to rotate via the worm 407, making the drive more convenient and the rotation smoother. The drive unit 403 may also be equipped with a reducer 405, which can control the rotation speed of the nut 402 according to actual needs, thereby controlling the movement speed of the lead screw 401, and thus controlling the movement speed of the gear sprocket 300, making it more convenient to use and more practical.

[0076] It should be noted that the outer peripheral wall of the nut 402 may also be provided with an external gear ring, and the drive part 403 may be provided with a drive gear. The drive gear meshes with the external gear ring, thereby driving the nut 402 to rotate.

[0077] In some embodiments of this application, such as Figure 4 As shown, the screw-driven gear clasp device also includes a third bearing 800, which is disposed on the bushing 200 and / or the gear clasp 300 and is coaxial with the bushing 200. The third bearing 800 is connected to the screw 401, and the bushing 200 rotates relative to the screw 401 through the third bearing 800.

[0078] For example, the third bearing 800 may include an inner ring and an outer ring that rotate relative to each other. One of the inner ring and the outer ring is fixedly connected to the bushing 200 and / or the toothed sprocket 300, and the other is fixedly connected to one end of the lead screw 401. The bushing 200 can rotate relative to the lead screw 401 by the relative rotation of the inner ring and the outer ring. The structure is simple, and the bushing 200 can rotate relative to the lead screw 401 when it rotates to any angle, which makes it more practical.

[0079] It should be noted that one of the inner and outer rings of the third bearing 800 can be fixedly connected to the bushing 200, fixedly connected to the gear sprocket 300, or fixedly connected to both the bushing 200 and the gear sprocket 300.

[0080] In some embodiments of this application, such as Figure 4 As shown, the overrunning clutch 900 can slide along the axial direction of the central shaft 100.

[0081] For example, a key structure 901 can be installed between the inner ring of the overrunning clutch 900 and the central shaft 100. The inner ring of the overrunning clutch 900 can slide along the axial direction of the central shaft 100 via the key structure 901 and is relatively fixed to the central shaft 100 in the circumferential direction. Specifically, the outer peripheral wall of the central shaft 100 may be provided with a keyway 101, which extends along the axial direction of the central shaft 100. The key structure 901 is installed in the overrunning clutch 900 and located within the keyway 101, and the key structure 901 can slide relative to the keyway 101 along the axial direction of the central shaft 100.

[0082] In this embodiment, the overrunning clutch 900 can slide along the axial direction of the central shaft 100, thereby enabling the bushing 200 connected to the overrunning clutch 900 to move along the axial direction of the central shaft 100.

[0083] It should be noted that in some other embodiments of this application, the inner ring of the overrunning clutch 900 may be fixedly connected to the central shaft, while the bushing 200 may be slidably connected to the outer ring of the overrunning clutch 900 along the axial direction of the central shaft 100.

[0084] The bicycle according to a second aspect of this application includes the anti-backward chainring device of the first aspect of the present application.

[0085] The bicycle according to the embodiments of this application, by employing the anti-backward chainring device of the first aspect of this application, can not only improve the rider's riding efficiency, but also reduce chain slippage, asymmetrical wear of the teeth, and tooth deformation, thereby improving the rider's riding experience and extending the service life of the bicycle. Furthermore, compared to the chainring 300 being moved by the chain during gear shifting on the freewheel 1100, in this application, the drive mechanism 400 actively drives the bushing 200, making the chainring 300 move more smoothly and precisely, reducing the occurrence of jamming. Moreover, after moving to the corresponding position, the drive mechanism 400 can restrict the movement of the bushing 200; that is, the bushing 200 will not move passively due to chain traction, improving riding stability. Furthermore, since the drive unit 403 indirectly drives the bushing 200 through the engagement of the nut 402 and the lead screw 401, even if the bushing 200 is subjected to an axial impact, such as a fall causing the chainring 300 to collide with a stone, the axial force exerted by the stone on the chainring 300 is not easily transmitted to the drive unit 403, thus preventing damage to the drive unit 403. In addition, because the overrunning clutch 900 has a one-way transmission function, when the rider pedals and drives the bottom bracket 100 to rotate in one direction, the overrunning clutch 900 is engaged, allowing the bottom bracket 100 to drive the bushing 200 and chainring 300 to rotate, which in turn allows the chainring 300 to move the chain. Conversely, when the rider pedals in the opposite direction, the overrunning clutch 900 is disengaged, preventing the bottom bracket 100 from driving the bushing 200 and chainring 300 to rotate, thus avoiding chain slippage and improving practicality.

[0086] It should be noted that since the bicycle can adopt all the technical solutions of the anti-backward chainring device of the first aspect embodiment, it has at least all the beneficial effects brought about by the technical solutions of the first aspect embodiment. These additional beneficial effects will not be elaborated here.

[0087] It is understood that other components and operations of the bicycle according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0088] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A toothed disc anti-reverse device, characterized in that, include: The center axle is used for rotatable mounting to the chassis; An overrunning clutch is mounted on the outer peripheral wall of the central shaft; A bushing is fitted onto the outside of the central shaft and connected to the overrunning clutch; the bushing is movable along the axial direction of the central shaft. The toothed disc is disposed on the bushing; A drive mechanism is installed on the outside of the central shaft. The drive mechanism includes a lead screw, a nut, and a drive unit. The lead screw extends along the axial direction of the central shaft and can slide along the axial direction of the central shaft. The bushing and / or the toothed sprocket are rotatably connected to the lead screw. The nut can rotate about its own axis. The nut is threadedly connected to the lead screw. The drive unit is drively connected to the nut to drive the nut to rotate.

2. The anti-reverse crankset device according to claim 1, characterized in that, The anti-reverse crank plate device also includes: An assembly mount is provided for mounting on the vehicle frame, and the assembly mount is provided with mounting holes in which the central shaft is rotatably mounted.

3. The anti-reverse crankset device according to claim 2, characterized in that, The anti-reverse crank plate device also includes: A first bearing is installed at the end of the mounting hole away from the toothed disc; The second bearing is installed at one end of the mounting hole near the toothed disc; The central shaft is rotatably mounted within the first bearing and the second bearing.

4. The anti-reverse crankset device according to claim 3, characterized in that, The lead screw is slidably installed in the mounting hole. The lead screw has a sleeve hole that extends axially and is sleeved on the outside of the central shaft through the sleeve hole.

5. The anti-reverse crankset device according to claim 4, characterized in that, The wall of the sleeve hole fits against the outer peripheral wall of the second bearing.

6. The anti-reverse crankset device according to claim 4, characterized in that, An anti-rotation part is provided between the assembly seat and the lead screw, which is used to restrict the lead screw from rotating around its own axis.

7. The anti-reverse crankset device according to claim 2, characterized in that, The nut is configured as a worm gear nut, and the driving unit includes a worm and a drive motor. The worm meshes with the worm gear nut, and the drive motor is driven by the worm to drive the worm to rotate; and / or, The nut is rotatably mounted on the assembly base or the vehicle frame, and the drive unit is mounted on the assembly base or the vehicle frame.

8. The anti-reverse crankset device according to claim 1, characterized in that, The anti-reverse crank plate device also includes: A third bearing is disposed on the bushing and / or the toothed disc and is coaxial with the bushing. The third bearing is connected to the lead screw, and the bushing rotates relative to the lead screw through the third bearing.

9. The anti-reverse crankset device according to claim 1, characterized in that, The overrunning clutch can slide along the axial direction of the central shaft.

10. A bicycle, characterized in that, Includes the anti-reverse gear plate device as described in any one of claims 1 to 9.

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