Bicycle front transmission and speed-changing bicycle using the same

Abstract

The present invention discloses a bicycle front derailleur and a speed-changing bicycle using the same. The bicycle front derailleur includes a gearbox, which includes a speed-changing assembly. The speed-changing assembly includes a drive assembly, a gear set, a worm wheel assembly, a worm assembly, an output assembly, a fixed bracket, and a limit assembly. The drive assembly is connected to a battery assembly and the gear set, respectively. The gear set is coaxially connected to the worm assembly, the worm assembly is meshed with the worm wheel assembly, and the worm wheel assembly is transmission-connected to the output assembly. The drive assembly, the gear set, the worm wheel assembly, and the worm assembly are all arranged in the fixed bracket. The limit assembly is arranged on the side of the fixed bracket to axially limit the worm assembly and radially limit the worm wheel assembly. The present invention utilizes the limit assembly to simultaneously limit and fix the components assembled on the fixed bracket. When the components need to be replaced, the limit assembly can be removed to achieve rapid replacement of the components on the fixed bracket, thereby improving the assembly and disassembly efficiency of the motor unit.

Description

Technical Field

[0001] The present invention relates to the technical field of bicycles, in particular to a bicycle front transmission and a speed-changing bicycle using the same. Background Art

[0002] The motor unit in a conventional bicycle front derailleur is often complex and time-consuming to assemble, particularly the motor, gears, and other transmission components. Conventional motor unit assembly often involves multiple steps, requiring individual fixturing of each component within the motor unit. This increases labor intensity and hinders production efficiency. Furthermore, conventional motor units are not easily assembled or disassembled, making replacement of motor unit components extremely inconvenient. Summary of the Invention

[0003] The purpose of the present invention is to provide a bicycle front derailleur and a speed-changing bicycle using the same, aiming to solve the problem in the prior art that the motor unit assembly requires each component to be fixed in sequence and cannot be quickly assembled and disassembled.

[0004] An embodiment of the present invention provides a front derailleur of a bicycle, comprising a gearbox, a linkage assembly, a derailleur guide and a battery assembly, wherein one end of the linkage assembly is connected to the gearbox, and the other end of the linkage assembly is connected to the derailleur guide, and the battery assembly is arranged on the gearbox; the gearbox comprises a gearbox housing and a gear shift assembly arranged in the gearbox housing, the gear shift assembly comprises a drive assembly, a gear set, a worm wheel assembly, a worm assembly, an output assembly, a fixed bracket and a limit assembly, the input end of the drive assembly is connected to the battery assembly, the output end of the drive assembly is connected to the input end of the gear set, the output end of the gear set is coaxially connected to the worm assembly, the worm assembly is meshed with the worm wheel assembly, and the worm wheel assembly is transmission-connected to the output assembly, the drive assembly, gear set, worm wheel assembly and worm assembly are all arranged in the fixed bracket, and the limit assembly is arranged on the side of the fixed bracket for simultaneously limiting the worm assembly axially and limiting the worm wheel assembly radially.

[0005] Furthermore, one side of the fixed bracket has an opening, the limiting assembly includes at least a bearing limiting end and a center shaft limiting end, the worm assembly includes a center shaft and helical teeth arranged on the center shaft, the worm wheel assembly includes a worm wheel bearing, a worm wheel shaft sleeved in the worm wheel bearing, a worm wheel arranged on the worm wheel shaft and transmission teeth, the last-stage gear of the gear set is coaxially arranged on the center shaft, the helical teeth are meshed with the worm wheel, and the transmission teeth are transmission-connected with the output assembly, the bearing limiting end is adapted to the shape of the worm wheel bearing and is pressed onto the outside of the worm wheel bearing from the opening, and the center shaft limiting end is pressed onto one end of the center shaft.

[0006] Furthermore, the output assembly includes an output gear, an output shaft, and an output swing arm. The output gear is meshed and connected to the worm gear assembly. One end of the output shaft is a special-shaped end. The output swing arm is provided with a special-shaped hole whose shape is adapted to the special-shaped end. The special-shaped end is arranged in the special-shaped hole. The output swing arm is fixedly connected to one end of the linkage assembly.

[0007] Furthermore, the output end of the drive assembly is arranged parallel to the central axis, the worm gear shaft is arranged perpendicular to the central axis, and the output shaft is arranged parallel to the worm gear shaft.

[0008] Furthermore, the helical teeth are located in the middle of the central shaft; when viewed along the axial direction of the worm gear shaft, the worm gear shaft is arranged between the output end of the drive assembly and the output shaft; when viewed along the axial direction of the central shaft, the central shaft is arranged between the drive assembly and the output gear.

[0009] Furthermore, the speed shift assembly also includes a first PCB board and a second PCB board, the first PCB board is arranged at one end of the transmission housing close to the battery assembly, and the second PCB board is arranged on the side of the transmission housing, a signal module is provided on the first PCB board, and an indicator light and an angle sensor are provided on the second PCB board.

[0010] Furthermore, it also includes a snap assembly, which includes a snap body, a protrusion arranged on one side of the snap body, a snap assembly arranged at one end of the snap body and an elastic member with one end arranged on the protrusion. A holding member is provided on the battery assembly, a fixing member and a groove are provided on the gearbox, the other end of the elastic member is provided on the fixing member, the protrusion can be inserted into the groove, and the snap assembly is clamped on the holding member.

[0011] Furthermore, the derailleur guide includes an inner guide plate and an outer guide plate connected to the inner guide plate, the inner guide plate and the outer guide plate are spaced apart, the inner guide plate and the outer guide plate are respectively connected to the linkage assembly, the inner guide plate is provided with a first protrusion facing the outer guide plate on the side thereof for pushing the chain to a specified position when the chain is shifted from the small plate to the large plate, and the outer guide plate is concave on the side thereof facing the inner guide plate to form a second protrusion for preventing the chain from falling out.

[0012] Furthermore, the distance between the first protrusion and the front end tangent of the linkage assembly is 6-7.5 mm; when the chain is on the small plate, the distance between the highest point of the first protrusion and the installation axis is 25-26 mm, and when the chain is on the large plate, the distance between the highest point of the first protrusion and the installation axis is 22.5-23.5 mm.

[0013] An embodiment of the present invention further provides a speed-changing bicycle, comprising the bicycle front derailleur as described above.

[0014] An embodiment of the present invention provides a front derailleur of a bicycle, comprising a gearbox, a linkage assembly, a derailleur guide and a battery assembly, wherein one end of the linkage assembly is connected to the gearbox, and the other end of the linkage assembly is connected to the derailleur guide, and the battery assembly is arranged on the gearbox; the gearbox comprises a gearbox housing and a gear shift assembly arranged in the gearbox housing, the gear shift assembly comprises a drive assembly, a gear set, a worm wheel assembly, a worm assembly, an output assembly, a fixed bracket and a limit assembly, the input end of the drive assembly is connected to the battery assembly, the output end of the drive assembly is connected to the input end of the gear set, the output end of the gear set is coaxially connected to the worm assembly, the worm assembly is meshed with the worm wheel assembly, and the worm wheel assembly is transmission-connected to the output assembly, the drive assembly, gear set, worm wheel assembly and worm assembly are all arranged in the fixed bracket, and the limit assembly is arranged on the side of the fixed bracket for simultaneously limiting the worm assembly axially and limiting the worm wheel assembly radially. The present invention utilizes a limiting assembly to simultaneously limit and fix the components assembled on the fixed bracket, and when the components need to be replaced, the limiting assembly can be removed to quickly replace the components on the fixed bracket, thereby greatly improving the assembly and disassembly efficiency of the motor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1A schematic structural diagram of a bicycle front derailleur provided by an embodiment of the present invention;

[0017] Figure 2 An exploded view of a bicycle front derailleur provided by an embodiment of the present invention;

[0018] Figure 3 An exploded view of a gearbox provided in an embodiment of the present invention;

[0019] Figure 4 An exploded view of a speed change assembly provided by an embodiment of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of part A;

[0021] Figure 6 A schematic structural diagram of an output assembly and an outer connecting rod provided in an embodiment of the present invention;

[0022] Figure 7 An exploded view of the output assembly and the outer connecting rod provided in an embodiment of the present invention;

[0023] Figure 8 Schematic diagram of the structure of the speed change assembly provided in an embodiment of the present invention Figure 1 ;

[0024] Figure 9 Schematic diagram of the structure of the speed change assembly provided in an embodiment of the present invention Figure 2 ;

[0025] Figure 10 A schematic diagram of the structure of the linkage component provided in an embodiment of the present invention;

[0026] Figure 11 A schematic structural diagram of an outer body provided in an embodiment of the present invention;

[0027] Figure 12 Schematic diagram of the structure of the buckle assembly provided in an embodiment of the present invention Figure 1 ;

[0028] Figure 13 The explosion of the buckle assembly provided by the embodiment of the present invention Figure 1 ;

[0029] Figure 14 The explosion of the buckle assembly provided by the embodiment of the present invention Figure 2 ;

[0030] Figure 15 Schematic diagram of the structure of the buckle assembly provided in an embodiment of the present invention Figure 2 ;

[0031] Figure 16 for Figure 15 Cross-sectional view of the middle BB;

[0032] Figure 17 for Figure 16 Enlarged view of part C;

[0033] Figure 18 for Figure 16 Enlarged view of part D in the middle;

[0034] Figure 19 Schematic diagram of the structure of the buckle assembly provided in an embodiment of the present invention Figure 3 ;

[0035] Figure 20 for Figure 19 Cross-sectional view of EE;

[0036] Figure 21 Schematic diagram of the structure of the buckle assembly provided in an embodiment of the present invention Figure 4 ;

[0037] Figure 22 for Figure 21 Cross-sectional view of the FF;

[0038] Figure 23 Schematic diagram of the structure of the buckle assembly provided in an embodiment of the present invention Figure 5 ;

[0039] Figure 24 A schematic structural diagram of an elastic member provided in an embodiment of the present invention;

[0040] Figure 25 A schematic diagram of the structure of the derailleur guide provided in an embodiment of the present invention Figure 1 ;

[0041] Figure 26 A schematic diagram of the structure of the derailleur guide provided in an embodiment of the present invention Figure 2 ;

[0042] Figure 27 A schematic diagram of the structure of the derailleur guide provided in an embodiment of the present invention Figure 3 ;

[0043] Figure 28 An exploded view of a battery assembly according to an embodiment of the present invention.

[0044] Description of the symbols in the figure:

[0045] 10. Gearbox; 11. Gearbox housing; 111. Bushing; 12. Speed ​​change assembly; 121. Drive assembly; 122. Gear set; 123. Worm gear assembly; 1231. Worm gear bearing; 1232. Worm gear shaft; 12321. Worm gear; 12322. Drive gear; 124. Worm assembly; 1241. Center shaft; 1242. Helical gear; 125. Output assembly; 1251. Output gear; 1252. Output shaft; 12521. Output bearing; 12522. Special-shaped end; 1253. Output swing arm; 12531. Special-shaped hole; 126. Fixing bracket; 127. Stop assembly; 1271. Bearing stop end; 1272. Center shaft stop end; 128. First PCB board; 129. Second PCB board; 13. Fixing piece; 14. Groove;

[0046] 20. Linkage assembly; 21. Outer body; 211. Screw hole; 22. Outer connecting rod; 23. Inner connecting rod; 24. Pin; 241. Special-shaped portion;

[0047] 30. Derailleur guide; 31. Inner guide; 311. First protrusion; 32. Outer guide; 321. Second protrusion;

[0048] 40. Battery assembly; 41. Clamping member; 411. Arc portion; 42. Battery housing; 43. Battery cell; 44. Battery bottom shell; 45. Third PCB board; 451. Charging port; 452. Light-transmitting column;

[0049] 50. Buckle assembly; 51. Buckle body; 511. Buckling notch; 52. Protruding piece; 53. Buckle piece; 54. Elastic piece; 541. Elastic part; 55. Arc groove; 56. Buckle groove. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0052] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0053] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0054] Combine Figures 1 to 5 As shown, an embodiment of the present invention provides a bicycle front derailleur, comprising a gearbox 10, a linkage assembly 20, a derailleur guide 30, and a battery assembly 40. One end of the linkage assembly 20 is connected to the gearbox 10, and the other end of the linkage assembly 20 is connected to the derailleur guide 30. The battery assembly 40 is arranged on the gearbox 10; the gearbox 10 comprises a gearbox housing 11 and a shift assembly 12 arranged in the gearbox housing 11. The shift assembly 12 comprises a drive assembly 121, a gear set 122, a worm gear assembly 123, a worm assembly 124, an output assembly 125, a fixing bracket 126, and a limit assembly 127. The drive assembly The input end of the component 121 is connected to the battery component 40, the output end of the driving component 121 is connected to the input end of the gear group 122, the output end of the gear group 122 is coaxially connected to the worm assembly 124, the worm assembly 124 is meshed with the worm wheel assembly 123, and the worm wheel assembly 123 is transmission-connected to the output assembly 125. The driving component 121, the gear group 122, the worm wheel assembly 123, and the worm assembly 124 are all arranged in a fixed bracket 126, and the limiting component 127 is arranged on the side of the fixed bracket 126, for simultaneously limiting the axial position of the worm assembly 124 and the radial position of the worm wheel assembly 123.

[0055] In this embodiment, first, the drive assembly 121 is the power input point. The drive assembly 121 is typically a motor. The input end of the drive assembly 121 is connected to the battery assembly 40, receiving electrical energy from the battery assembly 40 and converting the electrical energy into mechanical power. The output end of the drive assembly 121 is connected to the input end of the gear set 122, transmitting the mechanical power to the gear set 122. The gear set 122 further transmits the mechanical power. The output end of the gear set 122 is coaxially connected to the worm assembly 124. This coaxial connection ensures that the output end of the gear set 122 can convert the mechanical power into driving force and provide it to the worm assembly 124. The worm assembly 124 is meshedly connected with the worm gear assembly 123, which receives the driving force of the worm gear assembly 124 to achieve torque conversion. Finally, the output assembly 125 is transmission-connected to the worm gear assembly 123, receiving the driving force adjusted by the worm gear assembly 123, and ultimately outputting power, realizing the speed shifting function of the bicycle front derailleur.

[0056] In addition, the fixed bracket 126 is provided with a relatively obvious installation position, which is convenient for identifying and quickly installing the drive component 121, the gear group 122, the worm wheel assembly 123 and the worm assembly 124. The limiting assembly 127 is installed on the side of the fixed bracket 126 and has a dual limiting function: axial limiting of the worm assembly 124 and radial limiting of the worm wheel assembly 123. Specifically, the drive component 121, the gear group 122, the worm wheel assembly 123 and the worm assembly 124 are first assembled on the fixed bracket 126, and then fixed with the limiting assembly 127, which is quick and convenient; when any component of the drive component 121, the gear group 122, the worm wheel assembly 123 and the worm assembly 124 needs to be replaced or repaired, it is only necessary to disassemble the limiting assembly 127 for quick replacement without disassembling each component one by one. For the fixation between the fixed bracket 126 and the limiting assembly 127, screws are usually used for locking and fixing.

[0057] Furthermore, the linkage assembly 20 serves as an intermediate component connecting the transmission 10 and the derailleur guide 30. One end of the linkage assembly 20 is connected to the transmission 10, and the other end is connected to the derailleur guide 30. Through the linkage assembly 20, driving force can be effectively transmitted from the transmission 10 through the linkage assembly 20 to the derailleur guide 30, thereby shifting the chain. A battery assembly 40 is typically mounted on the transmission 10 to provide power to the transmission 10.

[0058] In one embodiment, one side of the fixed bracket 126 has an opening, the limiting assembly 127 includes at least a bearing limiting end 1271 and a center shaft limiting end 1272, the worm assembly 124 includes a center shaft 1241 and a helical tooth 1242 arranged on the center shaft 1241, the worm wheel assembly 123 includes a worm wheel bearing 1231, a worm wheel shaft 1232 sleeved in the worm wheel bearing 1231, a worm wheel 12321 and a transmission tooth 12322 arranged on the worm wheel shaft 1232, the last stage gear of the gear set 122 is coaxially arranged on the center shaft 1241, the helical tooth 1242 is meshed with the worm wheel 12321, the transmission tooth 12322 is transmission-connected with the output assembly 125, the bearing limiting end 1271 is adapted to the shape of the worm wheel bearing 1231 and is pressed onto the outside of the worm wheel bearing 1231 from the opening, and the center shaft limiting end 1272 is pressed onto one end of the center shaft 1241.

[0059] In this embodiment, one side of the fixed bracket 126 has an opening to facilitate the installation of some components from the opening. The limiting assembly 127 includes at least a bearing limiting end 1271 and a center shaft limiting end 1272. These two limiting ends correspond to different functions and installation positions: the bearing limiting end 1271 is adapted to the outer shape of the worm gear bearing 1231 (for example, an arc shape). By pressing the outer side of the worm gear bearing 1231 from the open side of the fixed bracket 126, it is ensured that the worm gear bearing 1231 remains stable during operation and prevents the worm gear bearing 1231 from shifting or loosening. The center shaft limiting end 1272 is used to press and stabilize one end of the center shaft 1241 to prevent axial displacement of the center shaft 1241 during movement.

[0060] The limiting component 127 in this embodiment is a bearing pressing plate, which has a central axis limiting end 1272 and two bearing limiting ends 1271, and can also be adjusted according to actual conditions. For example, two bearing limiting ends 1271 are provided in the vertical direction, and one central axis limiting end 1272 is provided in the horizontal direction. One end of the two bearing limiting ends 1271 is vertically connected to one end of a central axis limiting end 1272, and the overall shape is similar to a bent "Y" shape (refer to FIG. Figure 4). The worm gear bearing 1231 is placed on the fixed bracket 126, and the bearing limiting end 1271 of the bearing pressing plate is used to press the worm gear bearing 1231. At the same time, the center shaft limiting end 1272 is against one end of the center shaft 1241. When the worm assembly 124 and the worm gear assembly 123 are transmitting, the combined force direction of the worm assembly 124 is axial movement. The center shaft limiting end 1272 of the bearing pressing plate can resist the axial movement of the worm assembly 124, so that the worm assembly 124 can only rotate in place without generating axial displacement. The worm gear assembly 123 includes a worm gear bearing 1231, a worm gear shaft 1232, and a worm gear 12321 and a transmission tooth 12322 arranged on the worm gear shaft 1232. Among them, the worm gear 12321 directly engages with the helical teeth 1242 to realize force transmission and speed conversion; the transmission tooth 12322 outputs the adjusted power to the output assembly 125 to complete the final speed conversion.

[0061] Furthermore, a fixing bracket 126 can be used to fix the drive assembly 121 and the gear set 122 in relative position. The fixing bracket 126 is fixed to the interior of the transmission housing 11 by engaging with a positioning shaft hole, so that the fixing bracket 126 is firmly fixed within the transmission housing 11. In this embodiment, the gear set 122 includes three gears connected in sequence. The gear closest to the drive assembly 121 is the first-stage gear, the middle gear is the second-stage gear, and the gear in contact with the worm assembly 124 is the third-stage gear (i.e., the final-stage gear). The final-stage gear of the gear set 122 is coaxial with the central axis 1241.

[0062] Combine Figure 6 and Figure 7 As shown, in one embodiment, the output assembly 125 includes an output gear 1251, an output shaft 1252, and an output swing arm 1253. The output gear 1251 is meshedly connected to the worm gear assembly 123. One end of the output shaft 1252 is a special-shaped end 12522. The output swing arm 1253 is provided with a special-shaped hole 12531 whose shape is adapted to the special-shaped end 12522. The special-shaped end 12522 is arranged in the special-shaped hole 12531. The output swing arm 1253 is fixedly connected to one end of the linkage assembly 20.

[0063] In this embodiment, the output gear 1251 is the main power output component of the output assembly 125 and is meshed with the worm gear assembly 123. The power transmitted from the worm gear assembly 123 can be transmitted to the output gear 1251. The output shaft 1252 is the support shaft of the output gear 1251, and the output shaft 1252 can transmit the rotational force of the output gear 1251 to the output swing arm 1253. The end of the output shaft 1252 close to the output swing arm 1253 is designed as a special-shaped end 12522 to match the special-shaped hole 12531 in the output swing arm 1253. The special-shaped end 12522 and the special-shaped hole 12531 are both non-circular hole designs. The special-shaped hole 12531 and the special-shaped end 12522 in this embodiment are designed to be rectangular, of course, they can also be other polygonal shapes. In addition, the output swing arm 1253 is fixedly connected to one end of the linkage assembly 20 (by means of screw fixation, etc.), so that the power of the output assembly 125 can be transmitted to the derailleur guide 30 through the linkage assembly 20.

[0064] Furthermore, a sleeve 111 is provided on the transmission housing 11, and the sleeve 111 is sleeved outside the output bearing 12521. The design of the sleeve 111 not only provides additional support for the output shaft 1252, but also protects the output bearing 12521 from external influences, thereby enhancing the durability of the entire output system.

[0065] Combine Figure 8 and Figure 9 As shown, in one embodiment, the output end of the driving assembly 121 is arranged parallel to the central axis 1241 , the worm gear shaft 1232 is arranged perpendicular to the central axis 1241 , and the output shaft 1252 is arranged parallel to the worm gear shaft 1232 .

[0066] In this embodiment, the output end of the drive assembly 121 is arranged in parallel with the central axis 1241, which means that the output end of the drive assembly 121 and the central axis 1241 are on the same horizontal plane, but not on the same straight line. This layout helps to achieve effective power transmission while reducing space occupancy, making the structure of the entire speed change assembly 12 more compact. The arrangement of the worm gear shaft 1232 perpendicular to the central axis 1241 allows the worm gear assembly 123 to engage with the worm assembly 124 on the central axis 1241. This vertical configuration optimizes the direction of force transmission while reducing noise and wear during operation. The output shaft 1252 is arranged in parallel with the worm gear shaft 1232, that is, the output shaft 1252 and the worm gear shaft 1232 are placed in parallel on the same horizontal plane, so that the power transmission from the worm gear assembly 123 to the output assembly 125 is more direct and stable.

[0067] In one embodiment, the helical teeth 1242 are located in the middle of the central shaft 1241; when viewed along the axial direction of the worm gear shaft 1232, the worm gear shaft 1232 is arranged between the output end of the drive assembly 121 and the output shaft 1252; when viewed along the axial direction of the central shaft 1241, the central shaft 1241 is arranged between the drive assembly 121 and the output gear 1251.

[0068] In this embodiment, the helical teeth 1242 are located in the middle of the central shaft 1241. This position allows the helical teeth 1242 to mesh with the worm gear of the worm gear assembly 123, providing uniform and continuous torque transmission. Figure 8 As shown): The worm gear shaft 1232 is arranged between the output end of the drive assembly 121 and the output shaft 1252. When viewed along the axial direction of the central axis 1241 (as shown in FIG. Figure 9 As shown in FIG1 , the central shaft 1241 is placed between the drive assembly 121 and the output gear 1251. In this way, the fixing bracket 126 can leave a corresponding gap or installation space, making the design of the fixing bracket 126 more reasonable, the structure of the speed change assembly 12 more compact, and accommodating more circuit boards and other structures.

[0069] Combine Figure 10 and Figure 11 As shown, in one embodiment, the linkage assembly 20 includes an outer body 21, an outer link 22, and an inner link 23. One end of the outer body 21 is rotatably connected to one end of the outer link 22 through a pin 24. The pin 24 passes through the output shaft 1252 and the output swing arm 1253. The pin 24 is provided with a special-shaped portion 241. The special-shaped portion 241 is located in the special-shaped hole 12531 of the output swing arm 1253. The other end of the outer body 21 is rotatably connected to one end of the inner link 23. The other end of the outer link 22 and the other end of the inner link 23 are respectively rotatably connected to the two ends of the chain guide 30.

[0070] In this embodiment, one end of the outer body 21 is rotatably connected to one end of the outer link 22 via a pin 24. Specifically, the pin 24 passes through both the outer body 21 and the outer link 22, allowing the outer link 22 to rotate within a certain range to accommodate various speed shifting requirements. The pin 24 not only connects the outer body 21 and the outer link 22 but also passes through the output shaft 1252 and the output swing arm 1253. The pin 24 is designed with a shaped portion 241 that fits within the shaped hole 12531 of the output swing arm 1253. This allows the pin 24 and the output swing arm 1253 to rotate together when the output shaft 1252 rotates. The outer link 22 and the inner link 23 serve as transmission rods connecting the outer body 21 to the derailleur guide 30. The other ends of the outer link 22 and the inner link 23 are rotatably connected to the ends of the derailleur guide 30, respectively. This arrangement allows the derailleur guide 30 to rotate according to shifting requirements, enabling the chain to be shifted and adapting to different gear ratios. The other end of the outer body 21 is also connected to one end of the inner link 23 via a rotational connection. Thus, one end of the outer link 22 and one end of the inner link 23 are rotationally connected to the outer body 21, and the other end of the outer link 22 and the other end of the inner link 23 are also rotationally connected to the outer body 21, forming a four-bar linkage structure.

[0071] Specifically, the outer body 21 is a component that fixes the gearbox 10 to the inner link 23 and the outer link 22. The gearbox 10 is fixed to the outer body 21, and the outer link 22 is driven by the output swing arm 1253 and rotates around the axis of the output shaft 1252. When the outer link 22 rotates around the output shaft 1252, the entire four-bar linkage will produce a corresponding displacement, and the displacement to the required position can achieve the speed change effect. After the output torque of the output gear 1251 is converted, the torque is transmitted to the output swing arm 1253. Since the output swing arm 1253 and the outer link 22 are fixedly connected by other means, the outer link 22 also receives the torque from the output swing arm 1253 at this time. In addition, the output swing arm 1253 can also drive the pin 24 to rotate.

[0072] Furthermore, a screw hole 211 is provided on the side of the outer body 21, and the opening angle of the screw hole 211 is 80° (eg Figure 11 As shown in FIG. 1 , viewed from above, the design of this angle is conducive to the installation of the entire bicycle front derailleur. Of course, other angles, such as 78°, 85°, 90°, etc., are also possible.

[0073] In one embodiment, the speed shift assembly 12 further includes a first PCB board 128 and a second PCB board 129. The first PCB board 128 is disposed at one end of the transmission housing 11 close to the battery assembly 40, and the second PCB board 129 is disposed on a side of the transmission housing 11. A signal module is disposed on the first PCB board 128, and an indicator light and an angle sensor are disposed on the second PCB board 129.

[0074] In this embodiment, a first PCB 128 is mounted within the transmission housing 11, near one end of the battery assembly 40. This facilitates receiving power from the battery assembly 40 and processing signal transmissions. A signal module is mounted on the first PCB 128, which receives and processes user signals and other sensor input. Functions of the signal module include decoding operating instructions and controlling shifting. A second PCB 129 is mounted on a side edge of the transmission housing 11. This second PCB 129 primarily handles the user interface and sensor feedback. It includes an indicator light and an angle sensor. The indicator light provides visual feedback on the transmission status, such as low battery and shift warnings. The angle sensor is used to detect the relative position of the bicycle's front derailleur. In this embodiment, the first PCB 128 and the second PCB 129 are arranged perpendicular to each other.

[0075] Specifically, the first PCB board 128 serves as the main control PCB board. After the signal module on the main control PCB board receives the control demand, it can control the drive component 121 to rotate forward and reverse. The drive component 121 amplifies the torque by decelerating the gear set 122, and finally outputs a specific torque. An encoder (not shown in the figure) is provided on the gear set 122. The encoder is installed on the gear set 122 and rotates synchronously. When rotating, a sensor for identifying the rotation of the encoder is provided on the main control PCB board. The main control PCB board can identify the current required rotation position in real time. When the required rotation position is reached, the main control PCB board can control the drive component 121 to stop rotating. Since the gear set 122 contains a self-locking transmission system, after the drive component 121 stops, the entire speed change component 12 is self-locked in the current position. A button is provided on the gearbox 10, and the speed change can be controlled by pressing the button.

[0076] Combine Figures 12 to 14 As shown, in one embodiment, a snap assembly 50 is further included, which includes a snap body 51, a protruding piece 52 arranged on one side of the snap body 51, a snap member 53 arranged at one end of the snap body 51, and an elastic member 54 with one end arranged on the protruding piece 52. A holding member 41 is provided on the battery assembly 40, and a fixing member 13 and a groove 14 are provided on the gearbox 10. The other end of the elastic member 54 is provided on the fixing member 13, the protruding piece 52 can be inserted into the groove 14, and the snap member 53 is snapped onto the holding member 41.

[0077] In this embodiment, a protrusion 52 is positioned on one side of the buckle body 51 and can be inserted into the groove 14 on the transmission 10. This insertion provides a physical lock, ensuring a stable connection. A latch 53 is located at one end of the buckle body 51 and is used to engage with the retaining member 41 on the battery assembly 40. This latching mechanism allows the user to quickly install and remove the battery assembly 40 with simple operation. An elastic member 54 is positioned at one end on the protrusion 52 and at the other end on the fixing member 13 on the transmission 10. The elastic member 54 provides the necessary elastic force to maintain the protrusion 52 securely in the groove 14, while also allowing a certain degree of movement to accommodate varying assembly pressures. The fixing member 13 provides a fixing point for the elastic member 54, while the groove 14 serves as a docking groove for the protrusion 52. Through this structure, the buckle assembly 50 secures the battery assembly 40 to the transmission 10, ensuring that the battery assembly 40 remains stable and prevents it from falling during operation. Furthermore, the user can quickly replace the battery assembly 40, facilitating routine maintenance and emergency procedures.

[0078] Combine Figures 15 to 18 As shown, in one embodiment, the latch 53 is bent downward and forms an arc-shaped groove 55 with the latch body 51, the outer side of the holding member 41 bulges upward to form an arc-shaped portion 411, and a latch groove 56 is formed between the arc-shaped portion 411 and the battery assembly 40, the arc-shaped groove 55 is latched to the outside of the arc-shaped portion 411 and can move relative to the arc-shaped portion 411, and the latch 53 is latched in the latch groove 56 and can move relative to the latch groove 56.

[0079] In this embodiment, the latch 53 is designed to be curved downward and form an arcuate groove 55 with the latch body 51. The outer side of the retaining member 41 is designed as an upwardly protruding arcuate portion 411, forming a snap groove 56 with the battery assembly 40. Specifically, the arcuate groove 55 is snapped onto the outer side of the arcuate portion 411 to form a snap structure, and the latch 53 is snapped into the snap groove 56 to form another snap structure. In this way, the upper end of the latch body 51 is snap-connected to the battery assembly 40 via two snap structures, improving the stability of the snap. At the same time, because the arcuate groove 55 can move relative to the arcuate portion 411, specifically, the arcuate groove 55 is set downward and the arcuate portion 411 is set upward, when the lower end of the latch body 51 is pulled apart, the arcuate groove 55 can move in a direction away from the arcuate portion 411. The latch 53 is arranged downward and the latch groove 56 is arranged upward, so when the lower end of the latch body 51 is pulled open, the latch 53 will rotate with the latch groove 56 as the rotation center. Therefore, when the lower end of the latch body 51 is pulled open, the entire latch body 51 will rotate with the latch groove 56 as the rotation center, thereby releasing the locked state between the battery assembly 40 and the transmission 10. At this time, the latch 41 of the battery assembly 40 is disengaged from the latch 53 to remove the battery assembly 40. When installing the battery assembly 40, the lower end of the latch body 51 can also be pulled open, and the latch 41 of the battery assembly 40 is then connected to the latch 53, and then the lower end of the latch body 51 is released, and the elastic restoring force of the elastic member 54 is used to automatically insert the lower end (protrusion 52) of the latch body 51 back into the groove 14.

[0080] The buckle structure of this embodiment effectively solves the shortcomings of traditional fixing methods in terms of operational convenience and connection stability, not only improving the overall assembly efficiency, but also enhancing the reliability and durability of the buckle structure in long-term use.

[0081] Combine Figures 19 to 22 As shown, in one embodiment, the battery assembly 40 is disposed above the gearbox 10 , and the clamping member 41 is located above the fixing member 13 .

[0082] In this embodiment, the battery assembly 40 is positioned above the transmission 10. This vertical arrangement helps better utilize the vertical space within the bicycle derailleur, thereby increasing safety during use. The retaining member 41 is positioned above the fixing member 13. This arrangement allows the retaining member 41 to directly engage the battery assembly 40 and, in conjunction with the fixing member 13, provide additional support.

[0083] In one embodiment, the fixing member 13 is located above the groove 14 , the fixing member 13 is tilted upward, and the other end of the elastic member 54 is disposed on the top of the fixing member 13 .

[0084] In this embodiment, the upward-tilted structural design of the fixing member 13 not only enhances the bonding strength between the fixing member 13 and the adjacent holding member 41, but also provides a relatively ideal support point for installing the elastic member 54, so that the elastic member 54 can function more effectively. The main function of the groove 14 is to cooperate with other structural members (such as the protrusion 52) to provide a stable engagement position, thereby enhancing the fixing effect of the entire snap structure. The groove 14 located below the fixing member 13 helps to form a tight and efficient locking position, ensuring that the snap body 51 and the fixing member 13 are not prone to loosening. One end of the elastic member 54 is arranged on the protrusion 52, and the other end is fixed to the top of the fixing member 13, which enables the elastic member 54 to provide tension between the snap body 51 and the gearbox 10, which is beneficial to absorb and alleviate the vibration and impact generated by the bicycle movement.

[0085] In one embodiment, after the protruding member 52 is inserted into the groove 14 , the connecting line of the two ends of the elastic member 54 is tilted relative to the vertical line.

[0086] In this embodiment, when the protrusion 52 is inserted into the groove 14 (i.e., in the self-locking state), the configuration angle of the elastic member 54 causes it to generate prestress, thereby maintaining a certain tension in the connected state. By setting it at an angle, the elastic member 54 can provide additional elastic force, which helps to reduce the impact force caused by movement and keep the buckle body 51 in the self-locking state. In addition, this design also allows the buckle structure to be unlocked or locked by adjusting the pressure during disassembly and assembly, making installation and maintenance easier and faster. Figure 8 From a perspective, with the vertical direction of the buckle body 51 as a reference vertical line, in the locked state, the line connecting the two ends of the elastic member 54 is shown as gradually tilted relative to the vertical line.

[0087] In one embodiment, one end of the elastic member 54 is fixedly mounted on the protruding member 52 , and the other end is rotatably mounted on the fixing member 13 .

[0088] In this embodiment, the other end of the elastic member 54 is rotatably set on the fixing member 13. This rotation setting allows the elastic member 54 to have a certain degree of freedom of movement outside the fixed point, so that during the installation and removal of the battery assembly 40, one end of the elastic member 54 is fixed in the protrusion 52 and does not move with the movement of the snap body 51, and the other end of the elastic member 54 is rotatably set on the fixing member 13 and rotates with the rotation of the snap body 51.

[0089] Combine Figure 23 and Figure 24 As shown, in one embodiment, the elastic member 54 includes two elastic portions 541 , one end of the two elastic portions 541 is fixedly disposed on two sides of the protruding member 52 , and the other end of the two elastic portions 541 is rotatably disposed on two sides of the fixing member 13 .

[0090] In this embodiment, the two elastic portions 541 are symmetrically arranged, with one end of each elastic portion 541 fixedly attached to either side of the protruding member 52. The protruding member 52 typically engages with the recess 14, providing a locking point and ensuring a secure connection. The other ends of the two elastic portions 541 are pivotally attached to either side of the fixing member 13. This structure improves the balance of the buckle body 51 during rotation, enhancing rotational stability.

[0091] In one embodiment, the other end of the buckle body 51 is disposed toward a side away from the gearbox 10 to form a buckling notch 511 .

[0092] In this embodiment, the provision of the buckle notch 511 facilitates the user to unlock or adjust the buckle structure, thereby quickly and safely opening or closing the buckle body 51. The user can quickly adjust or unlock the buckle body 51 in different usage scenarios.

[0093] Combine Figures 25 to 27 As shown, in one embodiment, the derailleur guide 30 includes an inner guide plate 31 and an outer guide plate 32 connected to the inner guide plate 31. The inner guide plate 31 and the outer guide plate 32 are spaced apart. The inner guide plate 31 and the outer guide plate 32 are respectively connected to the linkage assembly 20. The side of the inner guide plate 31 facing the outer guide plate 32 is provided with a first protrusion 311 for pushing the chain to a specified position when the chain is shifted from the small plate to the large plate. The side of the outer guide plate 32 facing the inner guide plate 31 is concave to form a second protrusion 321 for preventing the chain from falling out.

[0094] In this embodiment, the inner guide plate 31 and outer guide plate 32 are spaced apart to accommodate chains of varying widths and guide the chain during shifting. A first protrusion 311 is provided on the side of the inner guide plate 31 facing the outer guide plate 32. The primary function of the first protrusion 311 is to push the chain to a designated position when shifting from the small to large chainrings, ensuring a smooth transition to the large chainring, reducing chain skipping during shifting and improving riding stability. The outer guide plate 32 corresponds to the inner guide plate 31 and is recessed on the side facing the inner guide plate 31 to form a second protrusion 321. This second protrusion 321 is designed to prevent the chain from falling off or dropping out during movement. Both the inner and outer guide plates 31 and 32 are connected to the linkage assembly 20, which transmits shift commands and drives the derailleur guide 30 to adjust as needed, achieving shifting between the sprockets.

[0095] Specifically, the derailleur guide 30 functions to move the chain to the desired position. The first and second protrusions 311, 321 on the derailleur guide 30 facilitate chain position change. When the chain shifts from the small to the large disc, chain vibration can cause the chain to drop. The derailleur guide 30 suppresses this vibration, reducing the risk of chain drop. The structural features of the first and second protrusions 311, 321 minimize the pressure applied to the chain during chain loading, effectively achieving chain loading. Chain loading begins when the chain approaches the large disc and is then brought to the large disc via the loading point on the small disc. Before being pulled onto the disc, the chain compresses against the small disc, causing wear on both the small disc and the chain. Since the chain cannot move left or right during loading, the protrusions on the derailleur guide 30 (i.e., the first and second protrusions 311, 321) are needed to help propel the chain into the correct position.

[0096] In one embodiment, the distance between the first protrusion 311 and the front end tangent of the linkage assembly 20 is 6-7.5 mm; when the chain is on the small plate, the distance between the highest point of the first protrusion 311 and the installation axis is 25-26 mm; when the chain is on the large plate, the distance between the highest point of the first protrusion 311 and the installation axis is 22.5-23.5 mm.

[0097] In this embodiment, the distance between the first protrusion 311 and the front end tangent line of the linkage assembly 20 (the front end is the forward direction of the bicycle) is set to 6-7.5 mm ( Figure 25 Maintaining this distance ensures that the linkage assembly 20 does not come into contact with the first protrusion 311 during the shifting process. When the chain is on the small plate, the highest point of the first protrusion 311 is aligned with the mounting axis (e.g., Figure 26 The distance f) is set to 25-26mm (such as Figure 25 When the chain is on the small plate, this distance setting can ensure that the first protrusion 311 pushes the chain to the appropriate position on the small plate, optimizing the contact angle of the chain. When the chain is on the large plate, the distance between the highest point of the first protrusion 311 and the installation axis is set to 22.5-23.5mm (such as Figure 26 The distance c) is to adapt to the different position requirements of the chain on the large plate, ensuring the stable operation of the chain on the large plate and effective gear meshing. In addition, the horizontal width of the first protrusion 311 can be set to 5.2mm (such as Figure 26 The horizontal length of the first protrusion 311 can be set to 7.7 mm (e.g., Figure 26 The distance e).

[0098] Combine Figure 28As shown, in one embodiment, the battery assembly 40 includes a battery housing 42, a battery cell 43, a battery bottom shell 44 and a third PCB board 45. The battery bottom shell 44 covers the bottom of the battery housing 42 to form an accommodating cavity. The battery cell 43 and the third PCB board 45 are arranged in the accommodating cavity. The third PCB board 45 is provided with a downward-facing charging port 451, and the battery bottom shell 44 is provided with a through hole corresponding to the charging port 451. The battery assembly 40 is arranged on the top of the gearbox 10.

[0099] In this embodiment, the battery housing 42 provides peripheral protection for the battery assembly 40 and serves as the structural foundation of the battery assembly 40. The battery bottom housing 44, in conjunction with the battery housing 42, covers the bottom of the battery housing 42, forming a closed housing chamber that houses and protects the battery cells 43 and the third PCB 45. The battery cells 43 store electrical energy and provide power to the transmission 10. The third PCB 45, mounted within the housing chamber, serves as part of the battery management system. The third PCB 45 is equipped with various circuits and components that control the charging and discharging of the battery cells 43, ensuring safe battery operation and improving energy efficiency. A downward-facing charging port 451 is provided on the third PCB 45, docking with the charging port 451 for easy access and connection. A light-transmitting column 452 is also provided on the third PCB 45 to indicate the charging status of the battery cells 43.

[0100] Specifically, the charging port 451 in this embodiment uses a Type-C interface. The battery bottom shell 44 is designed with positive and negative copper plates for output voltage, which can be connected to the third PCB board 45 and the battery cell 43 to form a power supply module. The power required for the forward and reverse rotation of the drive assembly 121 comes from the power supply module. The positive and negative copper plates of the battery cell 43 contact the retractable ejector pins on the transmission housing 11 to achieve real-time power supply. The retractable ejector pins are connected to the first PCB board. The Type-C interface is set downward to provide dust and water protection.

[0101] An embodiment of the present invention further provides a speed-changing bicycle, comprising the bicycle front derailleur as described above.

[0102] In this embodiment, the bicycle front derailleur is installed on a speed-changing bicycle. After receiving a speed-changing instruction, the bicycle front derailleur begins to adjust the speed and is applied to the speed-changing bicycle.

[0103] The various embodiments are described in a progressive manner throughout the specification. Each embodiment focuses on the differences from the other embodiments, and reference can be made to the common and similar parts between the various embodiments. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0104] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or article comprising a series of elements may include not only those elements, but also other elements not explicitly listed, or may also include elements inherent to such process, method, article or article. In the absence of further restrictions, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or article comprising the element.

Claims

1. A bicycle front derailleur, characterized in that: The transmission is connected to the transmission guide plate and the transmission housing is connected to the transmission housing, and the transmission housing is connected to the transmission housing by a toothed connection.

2. The bicycle front derailleur according to claim 1, wherein: One side of the fixed bracket has an opening, and the limiting assembly includes at least a bearing limiting end and a center shaft limiting end. The worm assembly includes a center shaft and helical teeth arranged on the center shaft. The worm wheel assembly includes a worm wheel bearing, a worm wheel shaft sleeved in the worm wheel bearing, a worm wheel arranged on the worm wheel shaft, and a transmission tooth. The last-stage gear of the gear set is coaxially arranged on the center shaft, the helical teeth are meshed with the worm wheel, and the transmission teeth are transmission-connected with the output assembly. The bearing limiting end is adapted to the shape of the worm wheel bearing and is pressed onto the outside of the worm wheel bearing from the opening, and the center shaft limiting end is pressed onto one end of the center shaft.

3. The bicycle front derailleur according to claim 2, wherein: The output assembly includes an output gear, an output shaft, and an output swing arm. The output gear is meshed with the worm gear assembly. One end of the output shaft is a special-shaped end. The output swing arm is provided with a special-shaped hole whose shape is adapted to the special-shaped end. The special-shaped end is arranged in the special-shaped hole. The output swing arm is fixedly connected to one end of the linkage assembly.

4. The bicycle front derailleur according to claim 3, wherein: The output end of the driving assembly is arranged parallel to the central axis, the worm gear shaft is arranged perpendicular to the central axis, and the output shaft is arranged parallel to the worm gear shaft.

5. The bicycle front derailleur according to claim 4, wherein: The helical teeth are located in the middle of the central axis; When viewed along the axial direction of the worm gear shaft, the worm gear shaft is arranged between the output end of the drive assembly and the output shaft; Viewed along the axial direction of the central shaft, the central shaft is disposed between the drive assembly and the output gear.

6. The bicycle front derailleur according to claim 1, wherein: The transmission assembly also includes a first PCB board and a second PCB board. The first PCB board is arranged at one end of the transmission housing close to the battery assembly, and the second PCB board is arranged on the side of the transmission housing. A signal module is arranged on the first PCB board, and an indicator light and an angle sensor are arranged on the second PCB board.

7. The bicycle front derailleur according to claim 1, wherein: It also includes a snap assembly, which includes a snap body, a protruding piece arranged on one side of the snap body, a snap piece arranged at one end of the snap body, and an elastic piece with one end arranged on the protruding piece. A holding piece is provided on the battery assembly, and a fixing piece and a groove are provided on the gearbox. The other end of the elastic piece is provided on the fixing piece, the protruding piece can be inserted into the groove, and the snap piece is snapped onto the holding piece.

8. The bicycle front derailleur according to claim 1, wherein: The derailleur guide includes an inner guide plate and an outer guide plate connected to the inner guide plate, the inner guide plate and the outer guide plate are spaced apart, the inner guide plate and the outer guide plate are respectively connected to the linkage assembly, the inner guide plate is provided with a first protrusion facing the outer guide plate on the side thereof for pushing the chain to a specified position when the chain is shifted from the small plate to the large plate, and the outer guide plate is concave on the side thereof facing the inner guide plate to form a second protrusion for preventing the chain from falling out.

9. The bicycle front derailleur according to claim 8, wherein: The distance between the first protrusion and the frontmost tangent line of the linkage assembly is 6-7.5 mm; When the chain is on the small plate, the distance between the highest point of the first protrusion and the installation axis is 25-26 mm. When the chain is on the large plate, the distance between the highest point of the first protrusion and the installation axis is 22.5-23.5 mm.

10. A speed-changing bicycle, characterized in that: The bicycle front derailleur comprises the bicycle front derailleur according to any one of claims 1 to 9.

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