An electric derailleur for a bicycle

Abstract

The utility model discloses a kind of electric derailleur for bicycle, including four-bar linkage mechanism, chain tensioning assembly, motor module and power supply;Four-bar linkage mechanism includes base member, movable component and connecting rod mechanism;Chain tensioning assembly includes chain guide wheel, tensioner and tensioning arm;The first end of tensioning arm is rotatably connected on movable component;Tensioner is rotatably arranged at the second end of tensioning arm;Chain guide wheel is rotatably arranged on movable component;Tensioning arm and the rotatable connection of movable component are equipped with reset component;Motor module is arranged on four-bar linkage mechanism, for driving movable component to move relative to base member;Power supply is arranged on four-bar linkage mechanism or chain tensioning assembly, for power supply to motor module.The electric derailleur is large to the tensioning range of chain, not only can make chain keep tension when switching and moving between different chain wheels, but also can keep tension when bicycle is folded;Solved the problem that wiring is difficult, disassembly and maintenance are difficult.

Description

Technical Field

[0001] This utility model relates to bicycle derailleurs, specifically to an electric derailleur for bicycles. Background Technology

[0002] In a bicycle, power is transmitted from the crankset to the freewheel, which contains at least one sprocket, via a chain, thus transferring power to the rear wheel. The chain interacts with the teeth on the sprockets in the crankset and also with the sprockets on the freewheel arranged around the rear wheel hub, enabling power transmission. In a single-speed bicycle, the freewheel uses a single sprocket. When the user pedals, the crankset rotates, moving the chain, which in turn causes the sprocket on the freewheel to rotate, ultimately rotating the rear wheel. In a multi-speed bicycle, the freewheel uses multiple sprockets. To allow the chain to switch between sprockets of different diameters, a derailleur is typically used for shifting gears.

[0003] With the development of the bicycle industry, the gear shifting system evolved from the traditional mechanical shifting system to the electronic shifting system. In the electronic shifting system, the derailleur is an electric derailleur, and the shift controller is an electronic shift controller. During shifting, the electronic shift controller sends corresponding control signals to the electric derailleur. Upon receiving the control signals, the electric derailleur controls its drive unit to drive the chain to switch between sprockets of different diameters, thereby achieving gear shifting control of the bicycle.

[0004] Existing electric derailleurs typically include a base component, a moving component, a chain guide, and a motor. The chain guide usually includes a chain guide plate, a tension wheel, and a guide wheel mounted on the chain guide plate. The moving component is movably connected to the base component via a linkage mechanism. The movement of the moving component is achieved by a motor mounted on either the base component or the moving component. The moving component drives the chain guide to move, achieving gear shifting by moving laterally relative to the base component. However, existing electric derailleurs have the following shortcomings:

[0005] 1. Existing electric derailleurs have the tension wheel and guide wheel located on the chain guide plate, resulting in a small tension range for the chain. When the bicycle is folded, the existing electric derailleurs cannot absorb the extra slack in the chain, making it impossible to keep the chain under tension when the bicycle is folded.

[0006] 2. The motor of the electric derailleur needs to be powered by a power source. Currently, the power source is installed inside the bicycle seat post. The cable needs to pass through the frame and then connect to the motor on the electric derailleur, which presents problems such as difficult cable routing and difficult disassembly and maintenance. Utility Model Content

[0007] The purpose of this invention is to overcome the aforementioned problems and provide an electric derailleur for bicycles. This electric derailleur has a wide chain tension range and can absorb additional chain slack. It can maintain tension not only when the chain moves between different sprockets, but also when the bicycle is folded. In addition, this electric derailleur solves the problems of difficult cable routing and difficult disassembly and maintenance.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] An electric derailleur for bicycles includes a four-bar linkage, a chain tensioning assembly, and a motor module; wherein,

[0010] The four-bar linkage includes a base component, a movable component, and a linkage mechanism; the linkage mechanism is hinged between the base component and the movable component.

[0011] The chain tensioning assembly includes a sprocket, a tensioning wheel, and a tensioning arm; the first end of the tensioning arm is rotatably connected to the movable component; the tensioning wheel is rotatably disposed at the second end of the tensioning arm; the sprocket is rotatably disposed on the movable component, and the axis of rotation of the tensioning arm does not coincide with the axis of rotation of the sprocket; a reset component is provided at the rotatable connection between the tensioning arm and the movable component; when the chain switches between different sprockets or when the bicycle is folded, the chain tensioning assembly keeps the chain under tension;

[0012] The motor module is mounted on a four-bar linkage and is used to drive the movable component to move relative to the base component.

[0013] The working principle of the electric derailleur used in bicycles described above is as follows:

[0014] During gear shifting, the motor module operates, driving the movable component to move relative to the base component. This movement causes the chain tensioning assembly to move, allowing it to achieve various sprocket positions. The movable component and the chain tensioning assembly move together to actuate the chain, switching the chain between different sprockets and realizing the gear shifting process. Specifically, the movable component is a moving component, and the guide sprocket moves with the movable component, thereby actuating the chain. The tensioning wheel and tensioning arm tension the chain. Because the guide sprocket is located on the movable component, and the tensioning wheel is located on the tensioning arm, and the axis of rotation of the tensioning arm does not coincide with the axis of rotation of the guide sprocket, the chain tensioning assembly has a large tension range, absorbing any excess slack in the chain. When the bicycle is folded, the chain tensioning assembly maintains tension on the chain.

[0015] In a preferred embodiment of this invention, the motor module is mounted on a base component, a movable component, or a linkage mechanism. With the linkage mechanism in place, the power output from the motor module can drive the movable component to move relative to the base component, thereby achieving gear shifting.

[0016] Preferably, the motor module is mounted on the base component, and the linkage mechanism includes a first link and a second link, with the second link located below the first link. One end of the first link is hinged to the base component, and the other end is hinged to the movable component. One end of the second link is hinged to the base component, and the other end is hinged to the movable component. The output end of the motor module is connected to the second link. During gear shifting, the motor module drives the second link to swing. Under the synchronous action of the first and second links, the movable component moves relative to the base component, thereby achieving gear shifting. The base component facilitates the installation of the motor module, and the location of the second link below the first link allows for better connection between the motor module and the second link, ensuring structural compactness.

[0017] Preferably, the motor module includes a housing fixed to a base member, a drive shaft rotatably mounted on the housing, a motor disposed inside the housing, and a transmission mechanism for transferring power from the motor to the drive shaft; the second connecting rod is connected to the drive shaft. In the above structure, the motor drives the transmission mechanism to move, causing the drive shaft to rotate, thereby causing the second connecting rod to swing, realizing the movement of the movable component.

[0018] Preferably, the axis of the motor is perpendicular to the axis of the drive shaft. This is to facilitate the placement of the motor module inside the base component, simplifying motor layout, saving space, and making the structure more compact.

[0019] Preferably, the base component includes an L-shaped housing and a mounting portion disposed on the L-shaped housing. The mounting portion is used to connect to the bicycle frame, and the motor module is installed in the space enclosed by the L-shaped housing. The motor module being housed within the L-shaped housing allows for a very compact structure and a more rational layout.

[0020] Preferably, the movable component includes an inner guide plate and an outer guide plate, the outer guide plate being fixed to the side of the inner guide plate, and the guide sprocket being rotatably disposed between the inner and outer guide plates; the first connecting rod and the second connecting rod are both hinged to the outer guide plate of the movable component; the tensioning arm is rotatably connected to the end of the inner guide plate. In the above structure, the movable component is composed of an inner guide plate and an outer guide plate, which simplifies the structure; and the guide sprocket is disposed at the end of the movable component closer to the linkage mechanism, while the tensioning arm is rotatably connected to the end of the movable component further away from the linkage mechanism.

[0021] Preferably, the inner guide plate is a flat plate structure, and its sides are divided into an inner side and an outer side. The side closer to the bicycle frame is the inner side, and the side closer to the outer guide plate is the outer side. The outer guide plate and the outer side of the inner guide plate are fixedly connected by screws. The tensioning arm is rotatably connected to the outer side of the inner guide plate. In the above structure, the inner guide plate is a flat plate structure, which is easy to process and has a simple structure. The inner guide plate and the outer guide plate are connected by screws, which facilitates installation and disassembly. Furthermore, both the outer guide plate and the tensioning arm are located on one side of the outer side of the inner guide plate, making the electric derailleur structure very compact.

[0022] An electric derailleur for bicycles includes a four-bar linkage, a chain tensioning assembly, a motor module, and a power supply; wherein,

[0023] The four-bar linkage includes a base component, a movable component, and a linkage mechanism; the linkage mechanism is hinged between the base component and the movable component.

[0024] The chain tensioning assembly includes a sprocket, a tensioning wheel, and a tensioning arm; the first end of the tensioning arm is rotatably connected to the movable component; the tensioning wheel is rotatably disposed at the second end of the tensioning arm; the sprocket is rotatably disposed on the movable component, and the axis of rotation of the tensioning arm does not coincide with the axis of rotation of the sprocket; a reset component is provided at the rotatable connection between the tensioning arm and the movable component; when the chain switches between different sprockets or when the bicycle is folded, the chain tensioning assembly keeps the chain under tension;

[0025] The motor module is mounted on the four-bar linkage and is used to drive the movable component to move relative to the base component.

[0026] The power supply is located on the four-bar linkage or chain tensioning assembly, and is used to power the motor module.

[0027] Preferably, the power supply is located on the base component, movable component, or linkage mechanism. This placement brings the power supply closer to the motor module, facilitating wire routing.

[0028] Preferably, the movable component is provided with a mounting groove, the power supply is disposed on the mounting groove, one end of the mounting groove and one end of the power supply are provided with a plug-in structure, and the other end of the mounting groove and the other end of the power supply are provided with a fastening structure; wherein,

[0029] The plug-in structure includes a slot at one end of the mounting groove and a tongue at one end of the power supply; the slot and the tongue are connected in a mating manner.

[0030] The fastening mechanism includes a fastening member hinged to the other end of the mounting slot and a fastening groove located at the other end of the power supply. The fastening member has a fastening hook in its center; when fastened, the hook engages in the fastening groove. The mounting slot facilitates the positioning and installation of the power supply. The fastening and plug-in structures secure both ends of the power supply. Specifically, after inserting the plug into the slot, the hook engages in the fastening groove to secure the power supply. For disassembly, the fastening member is pushed outwards, the hook disengages from the fastening groove, the plug separates from the slot, and the power supply can be removed. The operation is very convenient.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The electric chain derailleur of this utility model has a large tension range for the chain tensioning assembly because the guide wheel is set on the movable component and the tension wheel is set on the tensioning arm. This allows the chain tensioning assembly to absorb additional slack in the chain. It can not only maintain tension when the chain moves between different sprockets, but also maintain tension when the bicycle is folded. Even after the rear wheel is folded, the chain remains taut and does not fall off.

[0033] 2. The electric derailleur in this utility model absorbs slack through the chain tensioning assembly when the bicycle is folded, eliminating the need for an additional chain tensioner; this avoids unnecessary weight increase to the bicycle due to an additional chain tensioner.

[0034] 3. In the electric chain derailleur of this utility model, the guide wheel and tension wheel move simultaneously with the moving components, which makes the speed change more precise.

[0035] 4. The electric chain derailleur in this utility model eliminates the traditional mechanical speed change system. It uses a motor module to drive the moving component to move relative to the base component, thereby enabling the chain to switch between sprockets of different diameters.

[0036] 5. The electric chain derailleur of this utility model sets the power supply on the four-bar linkage or chain tensioning assembly, which can power the motor module and is very convenient for wiring, solving the problems of difficult wiring and difficult disassembly and maintenance. Attached Figure Description

[0037] Figure 1 This is a front view of the electric derailleur of this utility model.

[0038] Figure 2 This is a three-dimensional structural diagram of the electric derailleur in this utility model.

[0039] Figure 3 This is a side view of the electric derailleur of this utility model.

[0040] Figure 4 This is a schematic diagram of the installation structure of the motor module and part of the four-bar linkage in this utility model.

[0041] Figure 5 for Figure 4 An exploded view.

[0042] Figure 6 This is a three-dimensional structural diagram of the base component in this utility model.

[0043] Figure 7 This is a three-dimensional structural diagram of the motor module in this utility model, omitting part of the housing.

[0044] Figure 8 This is a schematic diagram of the installation structure of the chain tensioning assembly and part of the four-bar linkage in this utility model.

[0045] Figure 9 This is an exploded view of the inner guide plate and part of the chain tensioning assembly in this utility model.

[0046] Figure 10 This is an exploded view of the power supply, guide sprocket, and moving components in this utility model.

[0047] Figure 11 This is a cross-sectional view of the power supply and the outer side plate in this utility model. Detailed Implementation

[0048] To enable those skilled in the art to fully understand the technical solution of this utility model, the present utility model will be further described below in conjunction with the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0049] Example 1

[0050] See Figures 1-3 This embodiment discloses an electric derailleur for bicycles, including a four-bar linkage, a chain tensioning assembly, and a motor module 1.

[0051] See Figures 1-3 The four-bar linkage includes a base component 2, a movable component 3, and a linkage mechanism 4; the linkage mechanism 4 is hinged between the base component 2 and the movable component 3; the base component 2 is mounted on the bicycle frame, specifically, the first end of the linkage mechanism 4 is connected to the base component 2, and the second end of the linkage mechanism 4 is connected to the first end of the movable component 3.

[0052] See Figures 1-3 and Figure 8The chain tensioning assembly includes a sprocket 5, a tensioning wheel 6, and a tensioning arm 7. The first end of the tensioning arm 7 is rotatably connected to the movable member 3. The tensioning wheel 6 is rotatably disposed at the second end of the tensioning arm 7. The sprocket 5 is rotatably disposed on the movable member 3, and the axis of rotation of the tensioning arm 7 does not coincide with the axis of rotation of the sprocket 5. A reset assembly is provided at the rotatable connection between the tensioning arm 7 and the movable member 3. When the bicycle is shifting gears or folded, the elastic force of the reset assembly causes the tensioning arm 7 to swing backward, tensioning the chain. That is, when the chain moves between different sprockets or when the bicycle is folded, the chain tensioning assembly maintains tension on the chain.

[0053] See Figures 1-5 The motor module 1 is mounted on a four-bar linkage and is used to drive the movable component 3 to move relative to the base component 2. When the electric derailleur receives a control signal, it controls the motor module 1 to drive the linkage mechanism 4 to move, thereby driving the movable component 3 to move relative to the base component 2 and switching the chain between sprockets of different diameters.

[0054] See Figures 1-6 The motor module 1 is mounted on the base component 2. Connected by the linkage mechanism 4, the power output from the motor module 1 can drive the movable component 3 to move relative to the base component 2, thereby achieving gear shifting.

[0055] See Figures 1-6 The linkage mechanism 4 includes a first link 4-1 and a second link 4-2, with the second link 4-2 located below the first link 4-1. One end (first end) of the first link 4-1 is hinged to the base member 2, and the other end (second end) of the first link 4-1 is hinged to the movable member 3. One end (first end) of the second link 4-2 is hinged to the base member 2, and the other end (second end) of the second link 4-2 is hinged to the movable member 3 (first end). The output end of the motor module 1 is connected to the second link 4-2. The specific hinge positions of the first link 4-1 and the second link 4-2 with the movable component 3 are different. During speed change, the motor module 1 drives the second link 4-2 to swing. Under the synchronous action of the first link 4-1 and the second link 4-2, the movable component 3 moves relative to the base component 2, thereby realizing gear shifting. The base component 2 facilitates the installation of the motor module 1. The second link 4-2 is located below the first link 4-1, which makes it easier for the motor module 1 to connect with the second link 4-2, ensuring the compactness of the structure.

[0056] See Figures 1-6 The number of the second link 4-2 is two.

[0057] See Figures 1-7The motor module 1 includes a housing 1-1 fixed on a base component 2, a drive shaft 1-2 rotatably mounted on the housing 1-1 and the base component 2, a motor 1-3 disposed inside the housing 1-1, and a transmission mechanism 1-4 for transmitting power from the motor 1-3 to the drive shaft 1-2; the second connecting rod 4-2 is connected to the drive shaft 1-2. In the above structure, the output end of the motor module 1 is the main shaft of the motor 1-3. The motor 1-3 drives the transmission mechanism 1-4 to move, causing the drive shaft 1-2 to rotate, thereby causing the second connecting rod 4-2 to swing, realizing the movement of the movable component 3.

[0058] See Figures 1-7 The transmission mechanism 1-4 includes a worm gear transmission assembly and a gear transmission assembly. The motor 1-3 is driven by the worm gear transmission assembly and then by the gear transmission assembly to transmit power to the drive shaft 1-2.

[0059] See Figures 1-7 The axis of the motor 1-3 is perpendicular to the axis of the drive shaft 1-2. This is to facilitate the placement of the motor module 1 inside the base component 2, simplify the layout of the motor 1-3, save space, and make the structure more compact.

[0060] See Figures 1-7 The base component 2 includes an L-shaped housing 2-1 and a mounting part 2-2 disposed on the L-shaped housing 2-1. The mounting part 2-2 is used to connect the bicycle frame, and the motor module 1 is installed in the space enclosed by the L-shaped housing 2-1. The motor module 1 is disposed in the L-shaped housing 2-1, which makes the structure very compact and the layout more reasonable.

[0061] See Figures 1-3 and Figures 8-10 The movable component 3 includes an inner guide plate 3-1 and an outer guide plate 3-2. The outer guide plate 3-2 is fixed to the side of the inner guide plate 3-1. The guide sprocket 5 is rotatably disposed between the inner guide plate 3-1 and the outer guide plate 3-2. The first connecting rod 4-1 and the second connecting rod 4-2 are both hinged to the outer guide plate 3-2 of the movable component 3. The tensioning arm 7 is rotatably connected to the end of the inner guide plate 3-1. In the above structure, the movable component 3 is composed of an inner guide plate 3-1 and an outer guide plate 3-2, which makes the structure simpler. Furthermore, the guide sprocket 5 is disposed at the end of the movable component 3 that is closer to the linkage mechanism 4, and the tensioning arm 7 is rotatably connected at the end of the movable component 3 that is further away from the linkage mechanism 4.

[0062] See Figures 1-3 and Figures 8-10The first end of the tensioning arm 7 is rotatably connected to the second end of the movable component 3. The first end of the movable component 3 is located on the outer guide plate 3-2, and the second end of the movable component 3 is located on the inner guide plate 3-1.

[0063] See Figures 1-3 and Figures 8-10 The inner guide plate 3-1 is a flat plate structure. The sides of the inner guide plate 3-1 are divided into inner and outer sides. The side closer to the bicycle frame is the inner side, and the side closer to the outer guide plate 3-2 is the outer side. The outer guide plate 3-2 and the outer side of the inner guide plate 3-1 are fixedly connected by screws 8. The tensioning arm 7 is rotatably connected to the outer side of the inner guide plate 3-1. In this structure, the inner guide plate 3-1 is a flat plate structure, which is easy to process and has a simple structure. The inner guide plate 3-1 and the outer guide plate 3-2 are connected by screws 8, facilitating installation and disassembly. Furthermore, both the outer guide plate 3-2 and the tensioning arm 7 are located on one side of the outer side of the inner guide plate 3-1, making the electric derailleur structure very compact.

[0064] See Figures 1-3 and Figures 8-10 The outer guide plate 3-2 and the tensioning arm 7 are separately configured. That is, the tensioning arm 7 is only connected to the inner guide plate 3-1 and does not directly contact or connect with the outer guide plate 3-2. The outer guide plate 3-2 and the tensioning arm 7 are separate, and the outer guide plate 3-2 is indirectly connected to the tensioning arm 7 through the inner guide plate 3-1. The purpose of this is to simplify the structure of the electric derailleur, prevent the tensioning arm 7 from interfering with the outer guide plate 3-2, and allow the tensioning arm 7 to have a larger range of rotation on the inner guide plate 3-1, thereby improving the tensioning range of the chain.

[0065] See Figures 1-3 and Figures 8-10 The tensioning arm 7 has a column 9 at its first end, the column 9 having an inner cavity, and the column 9 is hinged to the inner guide plate 3-1. The second end of the tensioning arm 7 is inclined towards the outer side of the inner guide plate 3-1. This is to ensure that the tensioning wheel 6 can be close to the guide sprocket 5, allowing the chain to be smoothly guided and tensioned on the tensioning wheel 6 and the guide sprocket 5, preventing the chain from slipping off, and improving the stability of the chain operation.

[0066] See Figures 1-3 and Figures 8-10 The second end of the tensioning arm 7 is provided with two parallel guide discs 10, and the tensioning wheel 6 is disposed between the two guide discs 10. The two guide discs 10 can guide the chain and prevent the chain from falling off the tensioning wheel 6.

[0067] See Figures 1-3 and Figures 8-10The column 9 is hinged to the inner guide plate 3-1 via a hinge shaft 11. The hinge shaft 11 has an annular groove 12 at its end away from the inner guide plate 3-1. The column 9 has a mounting post 13 that passes through the annular groove 12 and is threadedly connected to the column 9. In this structure, the mounting post 13 allows the column 9 to be mounted on the hinge shaft 11. When the tension arm 7 rotates, the mounting post 13 can rotate within the annular groove 12, which axially limits the mounting post 13 and prevents the column 9 from dislodging.

[0068] See Figures 1-3 and Figures 8-10 The reset assembly is a torsion spring 18, which is sleeved on the hinge shaft 11 and located in the inner cavity. One end of the torsion spring 18 acts on the inner guide plate 3-1, and the other end acts on the column 9. The elastic force of the torsion spring 18 causes the tension arm 7 to rotate, thereby causing the tension wheel 6 to tension the chain.

[0069] See Figures 1-3 and Figures 8-10 The side of the column 9 is provided with a limiting protrusion 19, and the outer side of the inner guide plate 3-1 is provided with a limiting post 20. The limiting protrusion 19 and the limiting post 20 can prevent the tension arm 7 from colliding with the four-bar linkage due to the excessive elastic force of the torsion spring 18, thus playing a safety limiting role.

[0070] See Figures 1-3 and Figures 8-11 The electric derailleur also includes a power supply 21; the power supply 21 is mounted on the four-bar linkage and is used to supply power to the motor module 1. The power supply is a battery.

[0071] See Figures 1-3 and Figures 8-11 The power supply 21 is mounted on the movable component 3. Mounting the power supply 21 on the movable component 3 brings it closer to the motor module 1, facilitating wire routing.

[0072] See Figures 1-3 and Figures 8-11 The movable component 3 is provided with a mounting groove 22, and the power supply 21 is provided on the mounting groove 22. One end of the mounting groove 22 and one end of the power supply 21 are provided with a plug-in structure, and the other end of the mounting groove 22 and the other end of the power supply 21 are provided with a fastening structure.

[0073] See Figures 1-3 and Figures 8-11 The plug-in structure includes a slot 23 disposed at one end of the mounting groove 22 and a tongue 24 disposed at one end of the power supply 21; the slot 23 and the tongue 24 are connected in a mating manner.

[0074] See Figures 1-3 and Figures 8-11 The fastening mechanism includes a fastening member 25 hinged to the other end of the mounting groove 22 and a fastening groove 26 located at the other end of the power supply 21. A fastening hook 27 is provided in the middle of the fastening member 25. When fastened, the fastening hook 27 engages in the fastening groove 26. The mounting groove 22 facilitates the positioning and installation of the power supply 21. The fastening and insertion structures allow for the fixation of both ends of the power supply 21. Specifically, after inserting the tongue 24 into the slot 23, the fastening hook 27 is engaged in the fastening groove 26 to fix the power supply 21. For disassembly, the fastening member 25 is pushed outwards, the fastening hook 27 disengages from the fastening groove 26, the tongue 24 separates from the slot 23, and the power supply 21 can be removed. The operation is very convenient.

[0075] See Figures 1-3 and Figures 8-11 The mounting groove 22 is located on the outer side of the outer guide plate 3-2.

[0076] The bicycle in this embodiment includes a bicycle frame, a crank assembly, a freewheel, a chain, and a derailleur. The crank assembly, freewheel, and derailleur are all mounted on the bicycle frame, and the chain is connected to each of these components. When the bicycle is folded, the distance between the axis of the crank assembly and the axis of the freewheel decreases; that is, the distance between the axis of the crank assembly and the axis of the freewheel when the bicycle is folded is greater than the distance when the bicycle is folded. The derailleur is used to tension the chain. The axis of the crank assembly is the axis of the sprocket on the crank assembly, and the freewheel can consist of one or more sprockets.

[0077] See Figures 1-5 The working principle of the electric derailleur used in bicycles is as follows:

[0078] During gear shifting, motor module 1 operates, driving movable component 3 to move relative to base component 2, which in turn moves the chain tensioning assembly. This allows the chain tensioning assembly to obtain various sprocket positions. The chain is then actuated by the movement of movable component 3 and the chain tensioning assembly, switching between different sprockets and achieving the gear shifting process. Specifically, movable component 3 is a moving component; guide sprocket 5 moves with movable component 3, thereby actuating the chain; tensioning wheel 6 and tensioning arm 7 tension the chain. Because guide sprocket 5 is mounted on movable component 3, and tensioning wheel 6 is mounted on tensioning arm 7, and the axis of rotation of tensioning arm 7 does not coincide with the axis of rotation of guide sprocket 5, the chain tensioning assembly has a large tension range, absorbing any excess slack in the chain. When the bicycle is folded, the chain tensioning assembly maintains tension on the chain.

[0079] Example 2

[0080] The other structures in this embodiment are the same as in Embodiment 1, except that the motor module 1 is mounted on the movable component 3 or the linkage mechanism 4. The power supply 21 is mounted on the chain tensioning assembly, the base component 2, or the linkage mechanism 4.

[0081] The above are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. An electric derailleur for bicycles, characterized in that, It includes a four-bar linkage, a chain tensioning assembly, and a motor module; among which, The four-bar linkage includes a base component, a movable component, and a linkage mechanism; the linkage mechanism is hinged between the base component and the movable component. The chain tensioning assembly includes a sprocket, a tensioning wheel, and a tensioning arm; the first end of the tensioning arm is rotatably connected to the movable component; the tensioning wheel is rotatably disposed at the second end of the tensioning arm; the sprocket is rotatably disposed on the movable component, and the axis of rotation of the tensioning arm does not coincide with the axis of rotation of the sprocket; a reset component is provided at the rotatable connection between the tensioning arm and the movable component; when the chain switches between different sprockets or when the bicycle is folded, the chain tensioning assembly keeps the chain under tension; The motor module is mounted on a four-bar linkage and is used to drive the movable component to move relative to the base component.

2. The electric derailleur according to claim 1, characterized in that, The motor module is mounted on a base component, a movable component, or a linkage mechanism.

3. The electric derailleur according to claim 2, characterized in that, The motor module is mounted on the base component. The linkage mechanism includes a first link and a second link, with the second link located below the first link. One end of the first link is hinged to the base component, and the other end of the first link is hinged to the movable component. One end of the second link is hinged to the base component, and the other end of the second link is hinged to the movable component. The output end of the motor module is connected to the second link.

4. The electric derailleur according to claim 3, characterized in that, The motor module includes a housing fixed on a base component, a drive shaft rotatably mounted on the housing, a motor disposed inside the housing, and a transmission mechanism for transferring the power of the motor to the drive shaft; the second connecting rod is connected to the drive shaft.

5. The electric derailleur according to claim 4, characterized in that, The axis of the motor is perpendicular to the axis of the drive shaft.

6. The electric derailleur according to claim 2, characterized in that, The base component includes an L-shaped housing and a mounting part disposed on the L-shaped housing. The mounting part is used to connect the bicycle frame, and the motor module is installed in the space enclosed by the L-shaped housing.

7. The electric derailleur according to claim 3, characterized in that, The movable component includes an inner guide plate and an outer guide plate. The outer guide plate is fixed to the side of the inner guide plate. The guide sprocket is rotatably disposed between the inner guide plate and the outer guide plate. The first connecting rod and the second connecting rod are both hinged to the outer guide plate of the movable component. The tensioning arm is rotatably connected to the end of the inner guide plate. The inner guide plate is a flat plate structure. The sides of the inner guide plate are divided into inner and outer sides. The side closer to the bicycle frame is the inner side, and the side closer to the outer guide plate is the outer side. The outer guide plate and the outer side of the inner guide plate are fixedly connected by screws. The tensioning arm is rotatably connected to the outer side of the inner guide plate.

8. An electric derailleur for bicycles, characterized in that, It includes a four-bar linkage, a chain tensioning assembly, a motor module, and a power supply; among which, The four-bar linkage includes a base component, a movable component, and a linkage mechanism; the linkage mechanism is hinged between the base component and the movable component. The chain tensioning assembly includes a sprocket, a tensioning wheel, and a tensioning arm; the first end of the tensioning arm is rotatably connected to the movable component; the tensioning wheel is rotatably disposed at the second end of the tensioning arm; the sprocket is rotatably disposed on the movable component, and the axis of rotation of the tensioning arm does not coincide with the axis of rotation of the sprocket; a reset component is provided at the rotatable connection between the tensioning arm and the movable component; when the chain switches between different sprockets or when the bicycle is folded, the chain tensioning assembly keeps the chain under tension; The motor module is mounted on the four-bar linkage and is used to drive the movable component to move relative to the base component. The power supply is located on the four-bar linkage or chain tensioning assembly, and is used to power the motor module.

9. The electric derailleur according to claim 8, characterized in that, The power source is located on the base component, the movable component, or the linkage mechanism.

10. The electric derailleur according to claim 9, characterized in that, The movable component is provided with a mounting slot, the power supply is disposed in the mounting slot, one end of the mounting slot and one end of the power supply are provided with a plug-in structure, and the other end of the mounting slot and the other end of the power supply are provided with a fastening structure; wherein. The plug-in structure includes a slot at one end of the mounting groove and a tongue at one end of the power supply; the slot and the tongue are connected in a mating manner. The fastening structure includes a fastening member hinged to the other end of the mounting groove and a fastening groove provided at the other end of the power supply. The fastening member has a fastening hook in the middle. When fastened, the fastening hook is engaged in the fastening groove.

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