Rack and chainring assembly and bicycle

Abstract

This application discloses a rack and pinion chain assembly and a bicycle, relating to the field of bicycle technology. The rack and pinion chain assembly includes a bottom bracket, a bushing, a chainring, and a drive mechanism. The bottom bracket is rotatably mounted on the frame. The bushing is fitted onto the bottom bracket and can slide along the axial direction of the bottom bracket. The bushing and the bottom bracket are relatively fixed circumferentially. The chainring is mounted on the bushing. The drive mechanism is mounted on the outside of the bottom bracket and includes a rack, a gear, and a drive unit. The rack extends along the axial direction of the bottom bracket and can slide along the axial direction of the bottom bracket. The bushing and / or the chainring are rotatably connected to the rack. The gear meshes with the rack. The drive unit drives the gear to rotate. The rack and pinion chain assembly and bicycle of this application not only improve the rider's riding efficiency but also reduce chain slippage, asymmetrical tooth wear, and tooth deformation, thereby improving the rider's riding experience and extending the bicycle's lifespan.

Description

Technical Field

[0001] This application relates to the field of bicycle technology, and in particular to a rack and pinion assembly and a bicycle. Background Technology

[0002] In recent years, with the iterative upgrades of bicycle gear systems, the following drawbacks of traditional gear systems have been discovered: When riders shift gears, the movement of the chain between different levels of the freewheel creates a non-linear traction trajectory, causing the chain to be pulled at an angle. This results in the chain's driving force being ineffectively dissipated along the central axis, 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, which 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 a chainring assembly with a rack and pinion, 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 lifespan of the bicycle.

[0004] This application also proposes a bicycle having the aforementioned rack and pinion assembly.

[0005] According to an embodiment of the first aspect of this application, a rack and pinion chain assembly includes a bottom bracket, a bushing, a chain, and a drive mechanism. The bottom bracket is rotatably mounted on a vehicle frame. The bushing is fitted onto the bottom bracket and can slide along the axial direction of the bottom bracket. The bushing and the bottom bracket are fixed relative to each other in the circumferential direction of the bottom bracket. The chain is disposed on the bushing. The drive mechanism is mounted on the outside of the bottom bracket. The drive mechanism includes a rack, a gear, and a drive unit. The rack extends along the axial direction of the bottom bracket and can slide along the axial direction of the bottom bracket. The bushing and / or the chain is rotatably connected to the rack. The gear meshes with the rack. The drive unit is used to drive the gear to rotate.

[0006] The rack and pinion assembly according to the embodiments of this application has at least the following beneficial effects:

[0007] In this application, by installing a sliding bushing on the bottom bracket and mounting a chainring on the bushing, when the bicycle's freewheel shifts gears, the drive unit rotates the gear, which in turn drives the rack to slide. The rack then drives the bushing to slide along the bottom bracket's axial direction, 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 angles between the chain and the chainring, and between the chain and the freewheel, thus improving the rider's riding efficiency. Furthermore, because the angles are 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 thus extends the service life. Furthermore, in this application, the drive unit actively drives the bushing to move through the cooperation of gears and racks. Compared with the chain-driven chainring movement when shifting gears on a flywheel, the chainring movement in this application is smoother and more precise, reducing the occurrence of jamming. Moreover, once it moves to the corresponding position, it will not move randomly, improving riding stability. Furthermore, even if the bushing is subjected to axial impact, it is not easy to affect or damage the drive unit.

[0008] According to some embodiments of this application, the rack and pinion assembly further includes an assembly base for mounting on the frame, the assembly base having mounting holes in which the central shaft is rotatably mounted.

[0009] According to some embodiments of this application, the rack and pinion chain assembly further includes a first bearing and a second bearing, the first bearing being mounted at the end of the mounting hole away from the chain, the second bearing being mounted at the end of the mounting hole near the chain, and the central shaft being rotatably mounted within the first bearing and the second bearing.

[0010] According to some embodiments of this application, the rack is slidably installed in the mounting hole, and the rack is annular and sleeved on the outside of the central shaft.

[0011] According to some embodiments of this application, the inner peripheral wall of the rack is attached 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 rack, the anti-rotation part being used to restrict the rack from rotating about its own axis.

[0013] According to some embodiments of this application, the gear is mounted on the assembly base or the vehicle frame, and the drive unit is mounted on the assembly base or the vehicle frame; and / or, the drive unit includes a drive motor and a reducer, the drive motor being drivenly connected to the reducer, and the reducer being drivenly connected to the gear.

[0014] According to some embodiments of this application, the rack and pinion assembly further includes a third bearing, which is disposed on the bushing and / or the rack and coaxial with the bushing. The third bearing is connected to the rack, and the bushing rotates relative to the rack through the third bearing.

[0015] According to some embodiments of this application, a key structure is installed between the bushing and the central shaft, and the bushing can slide along the axial direction of the central shaft through the key structure and be relatively fixed to the central shaft in the circumferential direction.

[0016] The bicycle according to a second aspect of this application includes the rack and pinion chain assembly described in the first aspect of the present application.

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

[0018] The rack and pinion chain assembly of 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 shaft sleeve to move through the cooperation of gears and a rack. Compared to shifting gears via a chain, the chain sleeve 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. Even if the shaft sleeve is subjected to axial impact, it is less likely to damage the drive unit.

[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 rack and pinion gear assembly of this application;

[0024] Figure 4 This is a partial cross-sectional view of the rack and pinion assembly of this application.

[0025] Icon labels:

[0026] Central axis 100; Keyway 101;

[0027] Bushing 200; Key structure 201;

[0028] Crankset 300;

[0029] Drive mechanism 400; rack 401; gear 402; drive unit 403; drive motor 404; reducer 405; guide groove 406;

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

[0031] First bearing 600;

[0032] Second bearing 700;

[0033] Third bearing 800;

[0034] Frame 900;

[0035] Flywheel 1000. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] To better describe the rack and pinion chain assembly and bicycle of this application, a brief description is given here of the 300° angle change between the chain and chainring during conventional bicycle gear shifting. (Reference) Figure 1When the chain is in the highest gear (1000) on the cassette, there is a large angle θ between the chain and the chainring 300. Because of this angle θ, a significant axial component of the chain's driving force cannot be used to drive the cassette 1000, resulting in energy waste. Understandably, the larger the angle θ, the more energy is wasted. This embodiment reduces energy waste by decreasing the angle θ, thereby improving riding efficiency. (Reference) 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.

[0041] The following is for reference. Figure 3 and Figure 4 This application describes a rack and pinion chain assembly and a bicycle according to embodiments thereof.

[0042] like Figure 3 and Figure 4 As shown, the rack and pinion assembly according to the first aspect of this application includes a central shaft 100, a bushing 200, a rack 300, and a drive mechanism 400.

[0043] The central axle 100 is rotatably mounted on the frame 900. The bushing 200 is sleeved on the outside of the central axle 100 and can slide along the axial direction of the central axle 100. The bushing 200 and the central axle 100 are relatively fixed in the circumferential direction. The chainring 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 rack 401, a gear 402 and a drive unit 403. The rack 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 chainring 300 are rotatably connected to the rack 401. The gear 402 meshes with the rack 401. The drive unit 403 is used to drive the gear 402 to rotate.

[0044] For example, the bottom bracket 100 can be mounted on the frame 900 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.

[0045] The bushing 200 is fitted onto the outer side of the central shaft 100 and can slide along the axial direction of the central shaft 100. After the chainring 300 is fixed on the bushing 200, the chainring 300 can move along the axial direction of the central shaft 100, thereby adjusting the relative position of the chainring 300 and the central shaft 100. The bushing 200 and the central shaft 100 are relatively fixed in the circumferential direction so that when the central shaft 100 rotates, it can drive the bushing 200 to rotate, thereby driving the chainring 300 to rotate.

[0046] The drive mechanism 400 is mounted on the outside of the central shaft 100. The drive mechanism 400 includes a rack 401, a gear 402, and a drive unit 403. The rack 401 can be mounted on the assembly seat 500 or on the frame 900. The rack 401 can extend along the axial direction of the central shaft 100 and slide along the axial direction of the central shaft 100. The rack 401 can have multiple teeth, which are arranged along the axial direction of the central shaft 100. The rack 401 can be rotatably connected to the end of the rack 401 near the chainring 300 by the bushing 200, or the chainring 300 can be rotatably connected to the end of the rack 401 near the chainring 300, or both the bushing 200 and the chainring 300 can be rotatably connected to the end of the rack 401 near the chainring 300. Gear 402 can be rotatably mounted on assembly 500 or frame 900. Gear 402 meshes with rack 401. Drive unit 403 can be mounted on assembly 500 or frame 900. Drive unit 403 is connected to gear 402 to drive gear 402 to rotate. Drive unit 403 can be a direct drive motor 404 or a combination of drive motor 404 and reducer 405. Drive unit 403 drives gear 402 to rotate, gear 402 in turn drives rack 401 to move, rack 401 in turn drives bushing 200 to slide axially along central shaft 100, thereby driving chainring 300 to move axially along central shaft 100.

[0047] In this application, by mounting a slidable bushing 200 on the bottom bracket 100 and setting a chainring 300 on the bushing 200, when the bicycle freewheel 1000 shifts gears, the drive unit 403 drives the gear 402 to rotate. The gear 402 then drives the rack 401 to move, and the rack 401 then drives the bushing 200 to slide along the axial direction of the bottom bracket 100, thereby causing the chainring 300 to move along the axial direction of 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 1000, thus improving the rider's riding efficiency. Furthermore, because the angle is smaller, the meshing range between the chain and the teeth of the chainring 300 or the freewheel 1000 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. Furthermore, compared to the chain-driven movement of the chainring 300 during gear shifting in the cassette 1000, in this application, the drive unit 403 actively drives the bushing 200 through the engagement of gear 402 and rack 401. This not only makes the chainring 300 movement 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 reaches the corresponding position. That is, the bushing 200 will not move passively due to chain traction, improving riding stability. In addition, since the drive unit 403 indirectly drives the bushing 200 through the engagement of gear 402 and rack 401, even if the bushing 200 is subjected to 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 less likely to be transmitted to the drive unit 403, thus preventing damage to the drive unit 403.

[0048] It should be noted that the chainring 300 can stop at multiple gears when it moves along the axial direction of the central axis 100, for example, three. The gears of the chainrings on both sides can correspond to multiple gears on both sides of the freewheel 1000, and the gears of the chainring in the middle can correspond to multiple gears in the middle of the freewheel 1000.

[0049] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the rack and pinion chain assembly also includes an assembly base 500 for mounting on the frame 900. The assembly base 500 is provided with a mounting hole 501, and the bottom bracket 100 is rotatably mounted in the mounting hole 501.

[0050] For example, the assembly base 500 may be detachably mounted on the frame 900, such as by snapping onto the frame 900 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.

[0051] 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.

[0052] In some embodiments of this application, such as Figure 4 As shown, the rack and pinion chain assembly 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 chain 300, and the second bearing 700 is installed at the end of the mounting hole 501 close to the chain 300. The central shaft 100 is rotatably installed in the first bearing 600 and the second bearing 700.

[0053] 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.

[0054] In some embodiments of this application, such as Figure 4 As shown, the rack 401 is slidably installed in the mounting hole 501, and the rack 401 is annular and sleeved on the outside of the central shaft 100. In this embodiment, the rack 401 is annular, which not only makes assembly more convenient, but also makes the force more even and improves its practicality.

[0055] It should be noted that although the rack 401 is annular, the teeth on the rack 401 do not need to surround the rack 401. In addition, the rack 401 only needs to have teeth in some positions along the axial direction. For example, the end near the gear plate 300 does not need to have teeth.

[0056] It is understood that in some embodiments of this application, the rack 401 may not be annular but elongated, which will not be elaborated here.

[0057] In some embodiments of this application, such as Figure 4 As shown, the inner peripheral wall of the rack 401 is attached to the outer peripheral wall of the second bearing 700. In this embodiment, this arrangement not only makes the rack 401 more securely installed, but also reduces the resistance encountered when the rack 401 slides, and further makes the central shaft 100 more securely installed.

[0058] 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.

[0059] It should be noted that the first bearing 600 can also be other suitable types of bearings, which will not be elaborated here.

[0060] 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.

[0061] 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 rack 401 is pressed against the outer peripheral wall of the second bearing 700, the rack 401 can still move along the axial direction of the central shaft 100. Moreover, it can reduce the axial friction force on the rack 401, making the rack 401 move more smoothly along the axial direction of the central shaft 100, and the gear shifting of the chainring 300 is smoother.

[0062] 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.

[0063] 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 rack 401. The anti-rotation part 502 is used to restrict the rack 401 from rotating around its own axis. For example, the outer peripheral wall of the rack 401 may be provided with a guide groove 406, which extends along the axial direction of the rack 401. The anti-rotation part 502 can be inserted into the guide groove 406 and slide relative to the guide groove 406.

[0064] In this embodiment, an anti-rotation part 502 is provided to prevent the rack 401 from rotating arbitrarily, which would affect the meshing effect with the gear 402 and the movement effect of the drive shaft sleeve 200.

[0065] In some embodiments of this application, such as Figure 4 As shown, gear 402 is mounted on assembly base 500 or frame 900, and drive unit 403 is mounted on assembly base 500 or frame 900. In this embodiment, gear 402 and drive unit 403 can be mounted on assembly base 500, thereby enabling the chainring assembly to form a single assembly structure, making assembly more convenient. Of course, gear 402 and drive unit 403 can also be mounted on frame 900, which is more convenient for installation and wiring.

[0066] In some embodiments of this application, such as Figure 4As shown, the drive unit 403 includes a drive motor 404 and a reducer 405. The drive motor 404 is driven by the reducer 405, and the reducer 405 is driven by the gear 402. Specifically, both the drive motor 404 and the reducer 405 can be mounted on the assembly base 500 or the frame 900. 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 gear 402. In this embodiment, the drive unit 403 is equipped with a reducer 405, which can control the rotation speed of the gear 402 according to actual needs, thereby controlling the movement speed of the rack 401, and thus controlling the movement speed of the chainring 300, making it more convenient to use and more practical.

[0067] In some embodiments of this application, such as Figure 4 As shown, the rack and pinion assembly also includes a third bearing 800, which is disposed on the bushing 200 and / or the rack 300 and is coaxial with the bushing 200. The third bearing 800 is connected to the rack 401, and the bushing 200 rotates relative to the rack 401 through the third bearing 800.

[0068] 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 gear sprocket 300, and the other is fixedly connected to one end of the rack 401. The bushing 200 can rotate relative to the rack 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 rack 401 when it rotates to any angle, which makes it more practical.

[0069] 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.

[0070] In some embodiments of this application, such as Figure 4 As shown, a key structure 201 is installed between the bushing 200 and the central shaft 100. The bushing 200 can slide along the axial direction of the central shaft 100 through the key structure 201 and is relatively fixed to the central shaft 100 in the circumferential direction.

[0071] For example, both the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with keyways 101, the keyways 101 extending axially along the central shaft 100, and the key structure 201 installed within the two keyways 101 and capable of sliding relative to the keyways 101 along the axial direction of the central shaft 100. Alternatively, one of the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with a keyway 101, the keyway 101 extending axially along the central shaft 100, and the key structure 201 installed within the other and extending into the keyway 101, the key structure 201 capable of sliding relative to the keyway 101 along the axial direction of the central shaft 100.

[0072] In this embodiment, the key structure 201 can restrict the relative rotation between the central shaft 100 and the bushing 200, thereby enabling the central shaft 100 to drive the toothed disc 300 on the bushing 200 to rotate.

[0073] The bicycle according to a second aspect of this application includes the rack and pinion chain assembly described in the first aspect of this application.

[0074] The bicycle according to the embodiments of this application, by employing the rack and pinion chain assembly of the first aspect of this application, 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 service life. Furthermore, in this application, the drive unit 403 actively drives the shaft sleeve 200 to move through the cooperation of the gear 402 and the rack 401. Compared to the chain-driven movement of the chainring 300 during gear shifting on the freewheel 1000, the movement of the chainring 300 in this application is smoother and more precise, reducing the occurrence of jamming. Moreover, once moved to the corresponding position, it does not move arbitrarily, improving riding stability. Furthermore, even if the shaft sleeve 200 is subjected to axial impact, it is less likely to damage the drive unit 403.

[0075] It should be noted that since the bicycle can adopt all the technical solutions of the rack and pinion chain assembly of the first aspect embodiment described above, it has at least all the beneficial effects brought about by the technical solutions of the first aspect embodiment described above. These additional beneficial effects will not be elaborated here.

[0076] 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.

[0077] 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 rack and pinion gear assembly, characterized in that, include: The center axle is used for rotatable mounting to the chassis; A bushing is fitted onto the central shaft and can slide along the axial direction of the central shaft. The bushing and the central shaft are relatively fixed to each other in the circumferential 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 rack, a gear, and a drive unit. The rack extends axially along the central shaft and can slide axially along the central shaft. The bushing and / or the gear sprocket are rotatably connected to the rack. The gear meshes with the rack. The drive unit is connected to the gear to drive the gear to rotate.

2. The rack and pinion gear assembly according to claim 1, characterized in that, The rack and pinion assembly 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 rack and pinion gear assembly according to claim 2, characterized in that, The rack and pinion assembly 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 rack and pinion gear assembly according to claim 3, characterized in that, The rack is slidably installed in the mounting hole, and the rack is annular and sleeved on the outside of the central shaft.

5. The rack and pinion gear assembly according to claim 4, characterized in that, The inner peripheral wall of the rack is attached to the outer peripheral wall of the second bearing.

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

7. The rack and pinion gear assembly according to claim 2, characterized in that, The gear is mounted on the assembly base or the vehicle frame, and the drive unit is mounted on the assembly base or the vehicle frame; and / or, The drive unit includes a drive motor and a reducer, the drive motor being driven to the reducer, and the reducer being driven to the gear.

8. The rack and pinion gear assembly according to claim 1, characterized in that, The rack and pinion assembly also includes: A third bearing is disposed on the bushing and / or the gear plate and is coaxial with the bushing. The third bearing is connected to the rack, and the bushing rotates relative to the rack through the third bearing.

9. The rack and pinion gear assembly according to claim 1, characterized in that, A key structure is installed between the bushing and the central shaft. The bushing can slide along the axial direction of the central shaft through the key structure and is relatively fixed to the central shaft in the circumferential direction.

10. A bicycle, characterized in that, Includes the rack and pinion assembly as described in any one of claims 1 to 9.

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