Chain-free bicycle transmission shaft and bicycle

Abstract

The utility model discloses a chainless bicycle transmission shaft which comprises a transmission shaft assembly which is installed in an integral free detachable mode, the transmission shaft assembly comprises an assembly shell, a front transmission gear assembly and a rear transmission gear assembly, the front transmission gear assembly and the rear transmission gear assembly are in transmission connection through the transmission shaft assembly, and a hollow cavity is formed in the front transmission gear assembly. And the hollow cavity is matched with a driving piece in the middle of the bicycle. According to the chainless bicycle transmission shaft, the transmission shaft assembly can be directly arranged on the middle driving piece of the bicycle in a sleeving mode, the rear transmission gear assembly is directly arranged on the axle of the rear wheel, and therefore the transmission shaft assembly can be rapidly installed and conveniently disassembled, and the transmission shaft assembly can be suitable for various types of bicycles; and the free integral disassembly and assembly of the transmission shaft assembly are realized. The problem that an existing transmission shaft cannot be freely detached and integrally installed on a middle shaft and a middle gearbox of a bicycle is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a chainless bicycle drive shaft and a bicycle. Background Technology

[0002] Existing chainless bicycles generally use bevel gears and drive shafts for transmission. However, the current bevel gear transmission method can only be installed and used on specific bicycles. Once installed, the bevel gears and drive shafts are not easy to disassemble, which brings great inconvenience to bicycle maintenance and greatly limits the application range of chainless drive shaft bicycles.

[0003] For example, Chinese patent document CN207208361U discloses a chainless drive system for electric bicycles and an electric bicycle equipped with this system. The chainless drive system includes: a bottom bracket, a rear wheel hub, a first bevel gear coaxially arranged and driven by the bottom bracket, a second bevel gear coaxially connected by the rear wheel hub, and a shaft drive device connecting the first and second bevel gears; it also includes a centrally mounted motor driven by the first bevel gear, and a first one-way clutch is provided on the transmission path between the centrally mounted motor and the first bevel gear. The first and second bevel gears in this design are extremely inconvenient to install and disassemble, and cannot be applied to different bicycle models.

[0004] To solve the problem that existing driveshafts cannot be freely disassembled and installed as a whole on the bicycle's bottom bracket and mid-mounted gearbox, a chainless bicycle driveshaft and bicycle were designed. Utility Model Content

[0005] The purpose of this invention is to solve the problem that existing chainless driveshafts cannot be freely disassembled and installed as a whole on the bicycle bottom bracket and mid-mounted gearbox, thus making them unsuitable for various types of bicycles. The invention provides a chainless bicycle driveshaft and bicycle that can be freely disassembled as a whole, can be connected to the bicycle bottom bracket and mid-mounted motor, has a wide range of applications, and is easy to assemble and disassemble.

[0006] The technical solution adopted by this utility model to achieve its first inventive objective is as follows: a chainless bicycle driveshaft, including a driveshaft assembly that can be freely disassembled as a whole. The driveshaft assembly includes an assembly housing, a front drive gear assembly and a rear drive gear assembly that are connected by a driveshaft assembly. The front drive gear assembly is provided with a hollow cavity, and the hollow cavity is configured to cooperate with the middle drive component of the bicycle. This chainless bicycle driveshaft, through an integrated design, connects the front and rear drive gear assemblies into a single unit, forming a driveshaft assembly. A hollow cavity is incorporated within the front drive gear assembly, which is fitted to the bicycle's central drive unit. This structure allows for quick and easy installation of the driveshaft assembly when a chainless installation is desired; simply slide the driveshaft assembly onto the central drive unit and lock it in place. The rear drive gear assembly is directly mounted on the rear wheel axle. This facilitates both quick installation and easy disassembly, making the driveshaft assembly suitable for various types of bicycles and enabling free, complete disassembly and installation of the entire driveshaft assembly.

[0007] Preferably, the front drive gear assembly includes a hollow front drive gear integrated inside the front end of the assembly housing and a front driven gear meshing with the hollow front drive gear, with the hollow cavity disposed inside the hollow front drive gear. The hollow front drive gear facilitates engagement with the bicycle's central drive component, making operation convenient and quick. Furthermore, the integrated design of the hollow front drive gear and front driven gear makes disassembly easier, and provides good sealing performance and transmission efficiency.

[0008] Preferably, the included angle between the axis of the hollow front driving gear and the axis of the front driven gear is less than or equal to 90 degrees. This angled arrangement facilitates power transmission and allows the drive shaft assembly to rotate and fold around the hollow front driving gear.

[0009] Preferably, the hollow front drive gear includes a front drive gear and a transmission connector. The transmission connector is integrally or separately configured with the front drive gear. The hollow cavity is disposed inside the transmission connector and mates with the bicycle's central drive component. To broaden the application range of the driveshaft assembly, the hollow front drive gear can be configured with an integral or separate transmission connector combined with the front drive gear. By replacing or using different transmission connectors, different sizes of the hollow cavity structure can be achieved to meet the assembly requirements of different bottom brackets, mid-mounted motor shafts, or mid-mounted output ends.

[0010] Preferably, the rear drive gear assembly includes a rear drive gear integrated inside the rear end of the assembly housing and a rear driven gear meshing with the rear drive gear. The rear drive gear and the rear driven gear are also integrated, facilitating overall assembly and disassembly with the rear wheel axle.

[0011] Preferably, the rear axle angle between the axis of the rear driving gear and the axis of the rear driven gear is less than or equal to 90 degrees. The axle angle between the axis of the rear driving gear and the axis of the rear driven gear corresponds to the change in the axle angle between the hollow front driving gear and the front driven gear, thereby achieving effective transmission.

[0012] Preferably, the rear driven gear is mounted directly on the rear wheel or integrated into the assembly housing.

[0013] Preferably, the driveshaft assembly is rotated and folded together with the rear wheel, with the front drive gear assembly connected to the middle drive component of the bicycle as the rotation center.

[0014] Preferably, the bicycle center drive component is a bicycle bottom bracket; or a center-mounted motor shaft; or a center-mounted output terminal. The bicycle center drive component can be a bicycle bottom bracket, a center-mounted motor shaft located in the middle of the bicycle, or a center-mounted output terminal located in the middle of the bicycle.

[0015] Preferably, the driveshaft assembly includes an internal transmission component, and both ends of the internal transmission connector are respectively connected to the front transmission gear assembly and the rear transmission gear assembly. The driveshaft assembly can be a one-piece structure or a split structure, thereby achieving an integrated design of the driveshaft assembly.

[0016] Preferably, the internal transmission component is directly connected to the rear transmission gear assembly or is connected via a one-way ratchet assembly.

[0017] Preferably, the assembly housing includes a front driveshaft housing, a housing body, and a rear driveshaft housing, which may be integrally or separately configured. The assembly housing can be a separate unit comprising the front driveshaft housing, the housing body, and the rear driveshaft housing, which can be connected by threads or snap-fit ​​connections. The front driveshaft housing can also be integrally or separately configured, as can the rear driveshaft housing. The housing body can have a sleeve-like structure or a split-locking structure. Alternatively, the assembly housing can be an integral structure with a split-locking configuration. When the assembly housing is an integral structure, the front and rear driveshaft housings are integrated into the front and rear ends of the housing body, respectively.

[0018] The technical solution adopted by this utility model to achieve its second inventive objective is: a bicycle, which adopts the aforementioned chainless bicycle drive shaft, wherein the bicycle is a folding or non-folding bicycle or an electric bicycle with a central drive component.

[0019] The beneficial effects of this utility model are: the chainless bicycle driveshaft assembly can be directly mounted on the bicycle's bottom bracket, mid-mounted motor shaft, or mid-mounted output end, while the rear transmission gear assembly is directly mounted on the rear wheel axle. This achieves quick installation and easy disassembly of the driveshaft assembly, making it suitable for various types of bicycles and allowing for free overall disassembly and installation. It effectively solves the problem that existing driveshafts cannot be freely disassembled and installed as a whole on the bicycle's bottom bracket and mid-mounted gearbox. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a chainless bicycle drive shaft according to this utility model.

[0021] Figure 2 is an exploded structural diagram of a chainless bicycle drive shaft in Embodiment 1 of this utility model.

[0022] Figure 3 is a schematic diagram of the application structure of the chainless bicycle drive shaft in Embodiment 1 of this utility model.

[0023] Figure 4 is an exploded structural diagram of the chainless bicycle drive shaft in Embodiment 2.

[0024] Figure 5 This is a cross-sectional view of the chainless bicycle drive shaft in Example 2.

[0025] Figure 6 This is an exploded structural diagram of the chainless bicycle drive shaft in Embodiment 3.

[0026] Figure 7 This is a cross-sectional view of the chainless bicycle drive shaft in Embodiment 3.

[0027] Figure 8 This is a schematic diagram of a bicycle structure in this utility model.

[0028] Figure 9 yes Figure 8 A schematic diagram of a folding structure for a bicycle.

[0029] Figure 10 This is a schematic diagram of a chainless bicycle drive shaft in Example 5.

[0030] In the diagram: 100, front drive gear assembly; 200, rear drive gear assembly; 300, drive shaft assembly; 400, one-way ratchet assembly; 500, assembly housing.

[0031] 1. Hollow front drive gear; 1-1. Front drive gear;

[0032] 2. Front driven gear, 201, gear section, 202, connecting section;

[0033] 3. Rear drive gear; 4. Rear driven gear;

[0034] 5. Transmission connecting parts; 51. Connecting part bearing housing; 52. Transmission support part;

[0035] 6. Claw seat; 7. Claw; 8. Claw sheath;

[0036] 9. Main body of the casing; 91. External thread;

[0037] 10. Locking nut; 11. Oil seal; 12. Connecting bolt; 13. Fastening bolt; 14. Connecting hole; 15. Front connecting shaft; 16. Rear connecting shaft; 16a. Pawl sleeve connecting shaft; 17. Gear connecting hole; 18. Connecting screw hole; 18a. Connecting thread; 19. Shaft drive bearing; 20. Transmission support bearing one; 21. Transmission support bearing two; 22. Transmission component;

[0038] 23. Support cover; 231. Cover body support bearing seat; 232. Shaft through hole;

[0039] 24. Front drive gear housing; 241. Drive gear mounting part; 242. Driven gear mounting part; 243. Housing cavity; 244. Driven gear mounting cavity.

[0040] 25. Front passive housing; 251. Passive housing cavity; 252. Internal thread;

[0041] 26. Driven gear bearing;

[0042] 27. Rear drive gear housing; 271. Rear drive gear cavity; 272. Rear drive gear bearing housing 1; 273. Tapered connector; 274. Connecting pipe mounting cavity.

[0043] 28. Rear passive gear housing; 281. Rear passive gear mounting part; 282. Rear drive gear cover part;

[0044] 29. Rear support bearing one; 30. Rear support bearing two; 31. Pawl spring; 32. Pawl connecting hole;

[0045] 33. Gasket; 34. Cover plate;

[0046] A. Front driveshaft housing, B. Rear driveshaft housing, C. Driveshaft assembly, D. Bottom bracket, D1. Mid-mounted output end, D2. Mid-mounted motor shaft, E. Mid-mounted gearbox, F. Electric mid-mounted gearbox, ZK. Hollow cavity, QC. Front fork, BL. Stem, BW. Handlebar, ZDK1. Folding buckle one, ZDK2. Folding buckle two, LZ. Folding wheel, QL. Front wheel, HL. Rear wheel;

[0047] M, front axle angle; N, rear axle angle. Detailed Implementation

[0048] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0049] Example 1:

[0050] exist Figure 1 , Figure 2 In the illustrated embodiment, a chainless bicycle driveshaft includes a driveshaft assembly C that can be detached and installed as a whole. The driveshaft assembly C includes an assembly housing 500, a front drive gear assembly 100 and a rear drive gear assembly 200 that are connected by a driveshaft assembly 300. The front drive gear assembly 100 is provided with a hollow cavity ZK, which is configured to cooperate with the bicycle's central drive component.

[0051] The aforementioned bicycle center drive unit includes a bicycle bottom bracket D, a mid-mounted motor shaft D2, or a mid-mounted motor output terminal D1. The bicycle center drive unit can be a bicycle bottom bracket, a mid-mounted motor shaft located in the middle of the bicycle, or a mid-mounted output terminal located in the middle of the bicycle.

[0052] The mid-mounted output terminal D1 is the output terminal of the mid-mounted transmission E or the electric mid-mounted transmission F.

[0053] In this embodiment, the driveshaft assembly C is mounted on the bicycle's bottom bracket D. Specifically, the driveshaft assembly C can be directly fitted onto the bicycle's bottom bracket D through a hollow cavity. The driveshaft assembly C can be mounted on the bicycle regardless of left or right; the specific gear rotation direction can be adjusted by changing the gear position.

[0054] In another embodiment, the driveshaft assembly C can also be mounted on the mid-mounted output end D1 of the mid-mounted gearbox E or the electric mid-mounted gearbox F, which is mounted at the bottom bracket D position on the bicycle. That is, the driveshaft assembly C can be separately mounted and fixed to the mid-mounted output end D1 of the mid-mounted gearbox E or the electric mid-mounted gearbox F, and can be disassembled.

[0055] The drive shaft assembly C rotates and folds together with the rear wheel, with the front drive gear assembly connected to the central shaft, the central motor shaft, or the central output end as the rotation center.

[0056] The assembly housing 500 includes a front drive shaft housing A, a housing body 9, and a rear drive shaft housing B, which are either integrally or separately configured.

[0057] In this embodiment, the assembly housing 500 includes a front driveshaft housing A, a housing body 9, and a rear driveshaft housing B, which are arranged separately. The housing body 9 adopts a connecting pipe structure and is separately arranged from the front driveshaft housing A and the rear driveshaft housing B. The front driveshaft housing, housing body, and rear driveshaft housing, which are arranged separately, can be connected by threads or by snap-fit. The front driveshaft housing can also be arranged as a single piece or separately, and the rear driveshaft housing can also be arranged as a single piece or separately. The housing body can adopt a sleeve structure or a half-and-half snap-fit ​​structure.

[0058] The front drive gear assembly includes a front drive shaft housing A, a hollow front drive gear 1 integrated inside the front drive shaft housing A, and a front driven gear 2 meshing with the hollow front drive gear 1. The hollow cavity ZK is disposed inside the hollow front drive gear 1.

[0059] The hollow front drive gear 1 includes a front drive gear 1-1 and a transmission connector 5. The transmission connector 5 is integrally or separately configured with the front drive gear. The central cavity ZK is disposed inside the transmission connector 5 and is configured to cooperate with the central shaft D, the central motor shaft, or the central motor output end D1.

[0060] The included angle M between the axis of the hollow front driving gear 1 and the axis of the front driven gear 2 is less than or equal to 90 degrees.

[0061] The rear drive gear assembly includes a rear drive shaft housing B, a rear drive gear 3 integrated inside the rear drive shaft housing B, and a rear driven gear 4 meshing with the rear drive gear 3.

[0062] The rear axle angle N between the axis of the rear driving gear 3 and the axis of the rear driven gear 4 is less than or equal to 90 degrees. The rear axle angle N varies with the front axle angle M, that is, the rear axle angle N is consistent with the front axle angle M.

[0063] The drive shaft assembly 300 includes a housing body 9 that is integrally or separately configured, and an internal transmission component 22.

[0064] The hollow front drive gear 1 is supported and rotated by a transmission support bearing 20 and a transmission support bearing 21 mounted on the central shaft D, the central motor shaft, or the central output end D1.

[0065] In use, the hollow front drive gear 1 is installed inside the front drive shaft housing A, and can be connected to the bottom bracket D (without bearing 19) mounted on the bicycle along with the drive shaft assembly C (see...). Figure 3 ), or a centrally located motor shaft, or a centrally located output terminal D1 (see Figure 7 It can be installed and fixed in separate parts and can be disassembled as a whole.

[0066] The front drive gear 1-1 and the transmission connector 5 can be configured separately or as a single unit. The inner hole of the transmission connector 5 forms a hollow cavity and is compatible with the shape of the central shaft D, the central motor shaft, or the central output end D1, and is detachably fixedly connected. The compatibility can be a hexagonal, flat, square, spline, threaded, or other fixed connection method.

[0067] The rear drive gear 3 inside the rear drive shaft housing B can be connected to the internal transmission component 22 via a one-way ratchet assembly; the one-way ratchet assembly includes a pawl seat 6, a pawl 7, and a pawl sleeve 8. Alternatively, the internal transmission component 22 can be directly connected to the rear driven gear 4.

[0068] The rear driven gear 4 is coaxially fixed to the rear wheel HL, meaning that in use, the rear driven gear 4 is mounted on the rear wheel axle. Alternatively, it can be fixed to a rear driven gear 4 installed inside the rear driven housing 28.

[0069] like Figure 2 As shown, in this embodiment, the front drive shaft housing A includes a front active housing 24, a front passive housing 25, and a support cover 23.

[0070] The front active housing 24 includes an active gear mounting part 241 and a passive gear mounting part 242. The active gear mounting part 241 is provided with a housing cavity 243 that passes through the active gear mounting part, and the passive gear mounting part 242 is provided with a passive gear mounting cavity 244. The housing cavity 243 and the passive gear mounting cavity 244 are connected at the gear meshing point.

[0071] The axes of the housing cavity 243 and the driven gear mounting cavity 244 are set at a certain angle. This angle is the front axle angle M formed by the axis of the front driving gear 1-1 and the axis of the front driven gear 2. The front axle angle M can be a right angle of 90 degrees or less than 90 degrees.

[0072] The front passive housing 25 has a passive housing cavity 251 inside, and the front passive housing 25 and the front active housing 24 are connected as one unit by connecting bolts 12. The passive housing cavity 251 can be used to install support bearings and also facilitates the installation of the front passive gear.

[0073] The support cover 23 has a cover support bearing seat 231 and a shaft through hole 232 inside. The support cover 23 covers one end of the housing cavity 243 of the drive gear mounting part to achieve a cover seal for the front drive gear 1-1.

[0074] The aforementioned housing cavity 243 includes a gear receiving cavity and a bearing support seat.

[0075] The front drive gear 1-1 is integrated inside the gear housing cavity. Specifically, the front drive gear 1-1 is provided with a central connecting screw hole 18, and a transmission connector 5 is threadedly connected inside the central connecting screw hole 18. Inside the transmission connector 5, there is a hollow cavity ZK adapted to the central shaft D and a connector bearing seat 51. A gasket 33 is provided inside the connector bearing seat 51. After installation, a locking connection with the central shaft D is achieved through the shaft through hole 232 on the support cover 23 by an oil seal 11 and a locking nut 10.

[0076] On the outer wall of the transmission connector 5, on both sides of the front drive gear 1-1, there are transmission support parts 52 respectively. The transmission support parts 52 are provided with a first transmission support bearing 20 and a second transmission support bearing 21. The outer ring of the first transmission support bearing 20 is engaged with the inner wall of the bearing support seat in the housing cavity. The outer ring of the second transmission support bearing is engaged with the inner wall of the cover support bearing seat 231 inside the support cover.

[0077] The front driven gear 2 includes a gear part 201 and a connecting part 202. A connecting hole 14 is provided inside the connecting part 202. The gear part 201 of the front driven gear 2 is disposed in the driven gear mounting cavity 244 and meshes with the front driving gear 1-1.

[0078] The connecting part 202 of the front passive gear 2 is disposed inside the passive housing cavity 251 and is connected to the front passive housing 25 via a passive gear bearing 26.

[0079] An internal thread 252 is provided at the rear of the front passive housing 25, and an external thread 91 is provided at the front end of the housing body 9. The housing body 9 is threadedly connected to the front passive housing 25.

[0080] The internal transmission component 22 is provided with a front connecting shaft 15 and a rear connecting shaft 16 at both ends. The internal transmission component 22 passes through the housing body 9. The front connecting shaft 15 is connected to the connecting hole of the front driven gear 2.

[0081] The rear drive shaft housing B includes a rear active housing 27 and a rear passive housing 28. In this embodiment, the rear active housing 27 and the rear passive housing 28 are connected as one unit by fastening bolts 13.

[0082] The rear drive housing 27 contains a rear drive gear cavity 271 and a rear drive gear bearing housing 272. A rear support bearing 29 is housed within the rear drive gear bearing housing 272. The rear drive gear 3 is disposed within the rear drive gear cavity 271. The rear driven gear 4 and the rear driven housing 28 can be integrated or installed separately.

[0083] The rear passive gear housing 28 includes a rear passive gear mounting part 281 and a rear active gear cover part 282. The axes of the rear passive gear mounting part 281 and the rear active gear cover part 282 are set at a certain angle. This angle is the rear axle angle N of the axes of the rear active gear 3 and the rear passive gear 4. The rear axle angle N is consistent with the front axle angle M.

[0084] A rear drive gear bearing housing 283 is provided inside the rear drive gear cover 282, and a rear support bearing 30 is provided inside the rear drive gear bearing housing 283.

[0085] The rear driven gear 4 is disposed in the rear driven gear mounting part 281 and meshes with the rear driving gear 3.

[0086] It also includes a one-way ratchet assembly 400, which includes a pawl seat 6, a pawl 7, and a pawl sleeve 8.

[0087] The ratchet sleeve 8 has a ratchet cavity at one end and a ratchet sleeve connecting shaft 16a at the other end. Correspondingly, a gear shaft is provided on the rear drive gear 3, and a gear connecting hole 17 is provided inside the gear shaft. The ratchet sleeve connecting shaft 16a passes through the gear connecting hole 17 and is connected to the gear connecting hole 17.

[0088] The rear support bearing 29 is sleeved on the outer diameter of the gear shaft. The pawl 7 is mounted on the pawl seat 6 and installed inside the pawl cavity. The pawl 7 is equipped with a pawl spring 31, and the pawl seat 6 has a pawl connecting hole 32 inside.

[0089] A tapered connector 273 is provided at the end of the rear active housing 27 facing the connecting pipe. A connecting pipe mounting cavity 274 is provided inside the tapered connector 273. The rear connecting shaft 16 of the transmission component passes through the housing body 9 and the connecting pipe mounting cavity 274 to connect with the one-way ratchet assembly 400. Specifically, the rear connecting shaft 16 of the transmission component is engaged with the ratchet pawl connecting hole 32.

[0090] The front drive shaft housing A, the rear drive shaft housing B, and the main housing 9 can be either separate or integrated, as long as it facilitates the installation of internal components. The design can be tailored to specific design requirements and overall aesthetic needs.

[0091] Example 2:

[0092] exist Figure 4 , Figure 5 In the embodiment shown, a chainless bicycle driveshaft has a technical solution that is basically the same as that in Embodiment 1, except that:

[0093] The drive shaft assembly C can be separately installed and fixed to the mid-mounted gearbox E or the mid-mounted output end D1 of the electric mid-mounted gearbox F, which is mounted at the bottom bracket D of a bicycle, and can be freely disassembled as a whole.

[0094] The mid-mounted gearbox E and the electric mid-mounted gearbox F are mounted on the bottom bracket D of the bicycle. The gearbox output drives the front drive gear 1-1 in the front drive gear assembly, which in turn drives the rear wheel HL through the drive shaft assembly C.

[0095] In use, the hollow front drive gear 1 is installed in the front drive shaft housing A, and can be separately installed and fixed with the drive shaft assembly C and the mid-mounted output end D1 of the mid-mounted gearbox E and electric mid-mounted gearbox F mounted on the bicycle, and can be freely disassembled as a whole.

[0096] In this embodiment, the front drive gear 1-1 is integrated inside the gear receiving cavity. Specifically, the front drive gear 1-1 is provided with a central connecting screw hole 18, and a transmission connector 5 is threadedly connected inside the central connecting screw hole 18. Inside the transmission connector 5, a hollow cavity ZK adapted to the central output terminal D1 and a connector bearing seat 51 are provided. A shaft drive bearing 19 is provided inside the connector bearing seat 51. After installation, a locking connection with the central output terminal D1 is achieved inside the shaft through hole 232 on the support cover 23 through an oil seal 11 and a locking nut 10.

[0097] The chainless bicycle driveshaft in the above embodiments allows the driveshaft assembly to be directly mounted on the bicycle's bottom bracket, mid-mounted motor shaft, or mid-mounted output end. The rear transmission gear assembly is coaxially fixed to the rear wheel, enabling quick installation and easy disassembly of the driveshaft assembly. This makes the driveshaft assembly suitable for various types of bicycles and allows for free, complete disassembly and installation. This effectively solves the problem of existing driveshafts not being able to be freely disassembled and installed as a whole on the bicycle's bottom bracket and mid-mounted gearbox.

[0098] Meanwhile, in this embodiment, the one-way ratchet assembly 400 is not installed inside the rear drive shaft housing B, but is instead installed on the rear wheel.

[0099] Specifically, a tapered connector 273 is provided at the end of the rear active housing 27 facing the connecting pipe. A connecting pipe mounting cavity 274 is provided inside the tapered connector 273. The rear connecting shaft 16 of the transmission component passes through the connecting pipe and the connecting pipe mounting cavity 274 to connect with the rear active gear 3. Specifically, the rear connecting shaft 16 of the transmission component is engaged with the gear connecting hole 17 inside the rear active gear 3. This achieves a direct and fixed connection between the rear connecting shaft 16 of the transmission component and the gear connecting hole 17 of the rear active gear.

[0100] The difference between this embodiment and embodiment 1 is that the front drive shaft housing A is connected to the central output end D1, and the rear connecting shaft 16 of the transmission component is directly connected to the gear connecting hole 17 of the rear drive gear.

[0101] Example 3:

[0102] like Figure 6 , Figure 7 As shown, the chainless bicycle driveshaft in this embodiment is basically the same as the technical solutions in embodiments 1 and 2, except that:

[0103] The rear driven gear 4 is disposed in the rear driven gear mounting part 281 and meshes with the rear driving gear 3.

[0104] It also includes a one-way ratchet assembly 400, which includes a pawl seat 6, a pawl 7, and a pawl sleeve 8.

[0105] The ratchet sleeve 8 has a ratchet cavity at one end and a ratchet sleeve connecting shaft 16a at the other end. Correspondingly, a gear shaft is provided on the rear drive gear 3, and a gear connecting hole 17 is provided inside the gear shaft. The ratchet sleeve connecting shaft 16a passes through the gear connecting hole 17 and is connected to the gear connecting hole 17.

[0106] The rear support bearing 29 is sleeved on the outer diameter of the gear shaft. The pawl 7 is mounted on the pawl seat 6 and installed inside the pawl cavity. The pawl 7 is equipped with a pawl spring 31, and the pawl seat 6 has a pawl connecting hole 32 inside.

[0107] A tapered connector 273 is provided at the end of the rear active housing 27 facing the connecting pipe. A connecting pipe mounting cavity 274 is provided inside the tapered connector 273. The rear connecting shaft 16 of the transmission component passes through the housing body 9 and the connecting pipe mounting cavity 274 to connect with the one-way ratchet assembly 400. Specifically, the rear connecting shaft 16 of the transmission component is engaged with the ratchet pawl connecting hole 32.

[0108] The difference between Example 3 and Example 2 is that a one-way ratchet assembly 400 is provided in the rear drive shaft housing B.

[0109] Example 4:

[0110] exist Figure 8 , Figure 9 In the illustrated embodiment, a three-folding bicycle employs the driveshaft assembly C from Embodiment 1, Embodiment 2, or Embodiment 3. It also includes a front wheel QL, a rear wheel HL, and a mid-mounted gearbox E.

[0111] In another embodiment, the three-fold bicycle employs the driveshaft assembly C as described in Embodiment 1, 2, or 3. It also includes a front wheel QL, a rear wheel HL, and an electric mid-mounted gearbox F.

[0112] The front wheel is connected to the frame via a front fork QC.

[0113] The front wheel QL is folded to the frame via a folding buckle ZDK1.

[0114] The aforementioned three-fold bicycle also includes a handlebar (BW) and a stem (BL). The stem (BL) is foldably connected to the front fork (QC) via a folding buckle (ZDK2).

[0115] A folding push-pull structure is also provided above the rear wheel, which includes a folding frame and a folding wheel LZ.

[0116] like Figure 9 As shown, the drive shaft assembly C can rotate and fold together with the rear wheel HL around the front drive gear 1 connected to the central shaft D, the central motor shaft, or the central output end D1 as the rotation center. The folding direction of the front wheel QL is coordinated with the folding buckles ZDK1 and ZDK2 to fold regardless of left or right. In this embodiment, the front wheel QL is folded to the right.

[0117] When the central shaft D or the centrally mounted motor shaft is in operation, the gear shift can be achieved by using a commercially available gearbox installed on the rear wheel and connected to the rear driven wheel 4, thereby driving the rear wheel HL to rotate.

[0118] Example 5:

[0119] exist Figure 10 In the embodiment shown, a chainless bicycle driveshaft has a technical solution that is basically the same as that in Embodiment 1, except that:

[0120] The assembly housing 500 includes a front driveshaft housing A, a housing body 9, and a rear driveshaft housing B, all integrally formed. The assembly housing 500 has a cavity-like structure, with the front driveshaft housing A and the rear driveshaft housing B integrally formed at both ends of the assembly housing 500. The exterior of the assembly housing is sealed by a cover plate.

[0121] The chainless bicycle driveshaft described in the above embodiments is widely applicable to bicycles, electric bicycles, or other sports equipment. The driveshaft assembly can be directly mounted on the bicycle's bottom bracket, mid-mounted motor shaft, or mid-mounted output end, while the rear transmission gear assembly is directly mounted on the rear wheel axle. This allows for quick installation and easy disassembly of the driveshaft assembly, making it suitable for various types of bicycles and enabling free overall disassembly and installation. Furthermore, it greatly facilitates the modification of existing chain-driven bicycles. After partially disassembling the original chain components, the chainless bicycle driveshaft can be quickly installed and replaced directly on the bicycle's bottom bracket, mid-mounted motor shaft, or mid-mounted output end. This solves the problems of chain slippage and oil contamination found in existing chain-driven bicycles, and also provides excellent transmission performance.

[0122] The above embodiments are only some embodiments of this utility model, and not all embodiments. Furthermore, based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort and based on the technical solutions of this application should fall within the protection scope of this utility model.

Claims

1. A chainless bicycle drive shaft, characterized by: The transmission shaft assembly (C) is integrally detachably mounted, and comprises an assembly shell (500), a front transmission gear assembly (100) and a rear transmission gear assembly (200) which are drivingly connected through a transmission shaft assembly (300), the front transmission gear assembly (100) is provided with a hollow cavity (ZK), and the hollow cavity (ZK) is matched with a bicycle middle driving part.

2. A chainless bicycle transmission shaft according to claim 1, characterized in that: The front transmission gear assembly comprises a hollow front driving gear (1) which is integrated in the front end of the assembly shell (500) and a front driven gear (2) which is engaged with the hollow front driving gear (1), and the hollow cavity (ZK) is arranged in the hollow front driving gear (1).

3. A chainless bicycle transmission shaft according to claim 2, characterized in that: The front shaft included angle (M) between the axis of the hollow front driving gear (1) and the axis of the front driven gear (2) is less than or equal to 90 degrees.

4. A chainless bicycle transmission shaft according to claim 2, characterized in that: The hollow front driving gear (1) comprises a front driving gear (1-1) and a transmission connecting piece (5), the transmission connecting piece (5) is integrally arranged or separately arranged with the front driving gear (1-1), the hollow cavity (ZK) is arranged in the transmission connecting piece (5) and matched with the bicycle middle driving part.

5. The chainless bicycle drive shaft of claim 1, wherein: The rear transmission gear assembly (200) comprises a rear driving gear (3) which is integrated in the rear end of the assembly shell (500) and a rear driven gear (4) which is engaged with the rear driving gear (3), the rear shaft included angle (N) between the axis of the rear driving gear (3) and the axis of the rear driven gear (4) is less than or equal to 90 degrees, and the rear driven gear (4) is directly mounted on the rear wheel or mounted in the assembly shell (500).

6. Chainless bicycle transmission shaft according to any one of claims 1 to 5, characterized in that: The transmission shaft assembly (C) rotates and folds together with the rear wheel with the front transmission gear assembly (100) of the bicycle middle driving part as the rotation center.

7. A chainless bicycle transmission shaft according to any one of claims 1 to 5, characterized in that: The bicycle middle driving part is a bicycle middle shaft, a middle motor shaft or a middle output end.

8. Chainless bicycle transmission shaft according to any one of claims 1 to 5, characterized in that: The transmission shaft assembly (300) comprises an internal transmission part (22), both ends of the internal transmission part are drivingly connected with the front transmission gear assembly (100) and the rear transmission gear assembly (200) respectively, and the internal transmission part (22) is directly drivingly connected with the rear transmission gear assembly (200) or drivingly connected through a one-way ratchet assembly (400).

9. Chainless bicycle transmission shaft according to any one of claims 1 to 5, characterized in that: The assembly shell (500) comprises a front transmission shaft box (A), a shell main body (9) and a rear transmission shaft box (B) which are integrally arranged or separately arranged.

10. Bicycle, characterized in that The chainless bicycle transmission shaft is used in the bicycle of any one of claims 1 to 9, and the bicycle is a folding or non-folding bicycle or an electric bicycle with a bicycle middle driving part.

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