Low profile electromechanical rear derailleur

Abstract

The utility model discloses a low profile electromechanical rear derailleur, including base member, movable component, connecting rod mechanism, chain guide, motor module and power supply, the motor module sets up on base member for driving movable component moves relative to base member, the power supply sets up on movable component for giving motor module power supply, the base member is equipped with the installation position, chain guide includes chain guide wheel and tension pulley, the chain guide wheel has the wheel plane, and the installation position has the reference point, and the reference point is the reference point closest to the radial center plane of bicycle rear wheel, when the chain is located the minimum freewheel piece, the distance between reference point and wheel plane is greater than or equal to 0. The rear derailleur outwardly stretches the distance smaller, makes the rear derailleur whole almost hide in the inside of frame, can improve the safety of riding, when falling the car, effectively avoided the damage of rear derailleur, also solved the problem that the wiring is difficult, and the dismounting maintenance is difficult.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, specifically to a low-profile electromechanical rear derailleur. Background Technology

[0002] The rear wheel of a bicycle rotates along with the freewheel. In a multi-speed bicycle, the freewheel typically contains multiple sprockets. The rear derailleur is used to selectively engage the chain with one of these sprockets. With the development of the bicycle industry, the shifting system evolved from the traditional mechanical shifting system to the electronic shifting system. In an electronic shifting system, the rear derailleur is an electromechanical type, and the shift controller is an electronic shift controller. During shifting, the electronic shift controller sends a corresponding control signal to the electromechanical rear derailleur. Upon receiving the control signal, the electromechanical rear derailleur controls its drive mechanism to drive the derailleur unit to switch the chain between sprockets of different diameters, thus achieving gear control on the bicycle.

[0003] Existing electromechanical rear derailleurs typically include a base component, a movable component supporting a chain guide, a motor, and a linkage mechanism connecting the base component and the movable component to allow lateral movement of the chain guide relative to the base component. The movement of the movable component is achieved by a motor mounted on either the base component or the movable component, which in turn moves the chain guide to achieve gear shifting. The base component is usually mounted to the rear of the bicycle frame using mounting bolts screwed into threaded holes in the frame. However, existing electromechanical rear derailleurs have the following drawbacks:

[0004] 1. During gear shifting, due to the lateral movement of the chain guide required for switching the chain between multiple sprockets, the linkage mechanism, moving parts, and chain guide all extend a considerable distance outward along the outer edge of the bicycle, especially when the chain engages with the outermost sprocket. Therefore, the chain guide, with its large outward extension, is more susceptible to impacts or tangling with nearby objects during riding, particularly in mountainous terrain. This consequence worsens with the number of sprockets, increasing the lateral distance the chain guide must travel and posing a safety hazard.

[0005] 2. The motor of the electromechanical rear derailleur requires a power supply. Currently, the power supply is installed inside the bicycle seat post. The cable needs to pass through the frame and then connect to the motor on the electromechanical rear derailleur, which presents problems such as difficult cable routing and difficult disassembly and maintenance. Utility Model Content

[0006] The purpose of this invention is to overcome the aforementioned problems and provide a low-profile electromechanical rear derailleur. This electromechanical rear derailleur extends outward by a small distance, allowing it to be almost entirely hidden inside the frame, which improves riding safety and effectively prevents damage to the rear derailleur in the event of a crash. In addition, this electromechanical rear derailleur solves the problems of difficult cable routing and difficult disassembly and maintenance.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A low-profile electromechanical rear derailleur includes a base component, a movable component, a linkage mechanism, a chain guide, and a motor module; wherein...

[0009] The motor module is mounted on the base component, the movable component, or the linkage mechanism, and is used to drive the movable component to move relative to the base component.

[0010] The base component has an installation position, which is the location where the base component connects to the bicycle frame. The linkage mechanism is hinged between the base component and the movable component. The chain guide is disposed on the movable component and includes a guide wheel and a tension wheel. The guide wheel has a wheel plane, and the installation position has a reference point, which is a reference point closest to the radial center plane of the bicycle's rear wheel. When the chain is at the smallest freewheel, the distance between the reference point and the wheel plane is greater than or equal to 0. When the distance between the reference point and the wheel plane is greater than 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches the reference point and then moves away from it. When the distance between the reference point and the wheel plane is equal to 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually moves away from the reference point.

[0011] The working principle of the aforementioned low-profile electromechanical rear derailleur is as follows:

[0012] During gear shifting, the motor module operates, driving the movable component to move relative to the base component. This movement causes the chain guide to move, allowing it to access various freewheel positions. The movable component and the chain guide move together to actuate the chain, switching it between different freewheels and achieving the gear shifting process. When the distance between the reference point and the wheel plane is greater than 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches and then moves away from the reference point. When the distance between the reference point and the wheel plane is equal to 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually moves away from the reference point. This indicates that the reference point is closer to the freewheel, meaning the installation position is near the smallest freewheel or between the largest and smallest freewheels. When the chain is at the smallest freewheel position, the axial profile of the rear derailleur does not extend too far beyond the frame, making the entire rear derailleur almost hidden inside the frame. This results in a more compact and lower profile, improving riding safety.

[0013] In a preferred embodiment of this utility model, the motor module is mounted on a 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 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.

[0014] 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.

[0015] 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.

[0016] 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 mounting position is located on the mounting portion. 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.

[0017] Preferably, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches the mounting position, then intersects with the mounting position, and finally moves away from the mounting position. In the above structure, when the chain is at the smallest freewheel position, the mounting position is located between the largest and smallest freewheel positions. When the chain is at the smallest freewheel position, the axial profile of the rear derailleur will not extend too far beyond the outer side of the frame.

[0018] Preferably, when the chain is at the smallest freewheel position, the mounting position intersects with the wheel plane; as the chain moves from the smallest freewheel position towards the largest freewheel position, the wheel plane gradually moves away from the mounting position. In the above structure, when the chain is at the smallest freewheel position, the axial profile of the rear derailleur will not extend too far beyond the outer side of the frame.

[0019] Preferably, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches the base member, then intersects with the base member, and finally moves away from the base member. The purpose is to position the base member between the largest and smallest freewheels, further improving the compactness of the base member and allowing the rear derailleur to be almost entirely hidden inside the frame.

[0020] A low-profile electromechanical rear derailleur includes a base component, a movable component, a linkage mechanism, a chain guide, a motor module, and a power supply; wherein...

[0021] The motor module is mounted on the base component, the movable component, or the linkage mechanism, and is used to drive the movable component to move relative to the base component.

[0022] The power supply is located on the base component, movable component, linkage mechanism, or chain guide, and is used to supply power to the motor module.

[0023] The base component has an installation position, which is the location where the base component connects to the bicycle frame. The linkage mechanism is hinged between the base component and the movable component. The chain guide is disposed on the movable component and includes a guide wheel and a tension wheel. The guide wheel has a wheel plane, and the installation position has a reference point, which is a reference point closest to the radial center plane of the bicycle's rear wheel. When the chain is at the smallest freewheel, the distance between the reference point and the wheel plane is greater than or equal to 0. When the distance between the reference point and the wheel plane is greater than 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches the reference point and then moves away from it. When the distance between the reference point and the wheel plane is equal to 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually moves away from the reference point.

[0024] Preferably, the movable component is provided with a power supply mounting slot, the power supply is disposed in the power supply mounting slot, one end of the power supply mounting slot is provided with a plug-in structure to one end of the power supply, and the other end of the power supply mounting slot is provided with a fastening structure to the other end of the power supply; wherein,

[0025] The plug-in structure includes a slot at one end of the power mounting groove and a tongue at one end of the power supply; the slot and the tongue are connected in a mating manner.

[0026] The fastening mechanism includes a fastening member hinged to the other end of the power supply mounting slot and a fastening groove disposed at the other end of the power supply. The fastening member has a fastening hook in the middle; when fastened, the fastening hook engages with the fastening groove. The power supply mounting slot facilitates positioning and installation of the power supply. The fastening and insertion structures secure both ends of the power supply. Specifically, after inserting the tongue into the slot, the fastening hook engages with the fastening groove to secure the power supply. For disassembly, the fastening member is pushed outwards, the fastening hook disengages from the fastening groove, the tongue separates from the slot, and the power supply can be removed. The operation is very convenient.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The low-profile electromechanical rear derailleur of this utility model eliminates the traditional mechanical gear shifting system. It uses a motor module to drive the moving component to move relative to the base component, thereby realizing the switching of the chain between flywheels of different diameters.

[0029] 2. The low-profile electromechanical rear derailleur of this utility model sets the power supply on the base component, movable component, linkage mechanism or chain guide component, which can power the motor module and is very convenient for wiring, solving the problems of difficult wiring and difficult disassembly and maintenance.

[0030] 3. In the low-profile electromechanical rear derailleur of this utility model, when the distance between the reference point and the wheel plane is greater than 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches the reference point and then moves away from it. When the distance between the reference point and the wheel plane is equal to 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually moves away from the reference point. This indicates that the reference point is closer to the freewheel, meaning the installation position is near the smallest freewheel or between the largest and smallest freewheels. When the chain is at the smallest freewheel position, the axial profile of the electromechanical rear derailleur does not extend too far beyond the outer side of the frame, making the entire electromechanical rear derailleur almost hidden inside the frame. The entire electromechanical rear derailleur structure is more compact and has a lower profile, which improves riding safety. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a low-profile electromechanical rear derailleur in use according to this utility model.

[0032] Figure 2 This is a partially exploded view of the electromechanical rear derailleur of this utility model in use.

[0033] Figure 3 This is a side view of the electromechanical rear derailleur and freewheel in this utility model.

[0034] Figure 4 This is a front view of the electromechanical rear derailleur of this utility model.

[0035] Figure 5 This is a three-dimensional structural diagram of the electromechanical rear derailleur of this utility model.

[0036] Figure 6 This is a side view of the electromechanical rear derailleur of this utility model.

[0037] Figure 7 This is a schematic diagram of the installation structure of the motor module, base component and part of the linkage mechanism in this utility model.

[0038] Figure 8 for Figure 7 An exploded view.

[0039] Figure 9 This is a three-dimensional structural diagram of the base component in this utility model.

[0040] Figure 10 This is a three-dimensional structural diagram of the motor module in this utility model, omitting part of the housing.

[0041] Figure 11 This is a schematic diagram of the installation structure of the chain guide and the movable component in this utility model.

[0042] Figure 12 This is an exploded view of the inner guide plate and part of the chain guide components in this utility model.

[0043] Figure 13 This is an exploded view of the power supply, guide sprocket, and moving components in this utility model.

[0044] Figure 14 This is a cross-sectional view of the power supply and the outer side plate in this utility model. Detailed Implementation

[0045] 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.

[0046] Example 1

[0047] See Figures 1-8 This embodiment discloses a low-profile electromechanical rear derailleur, including a base component 2, a movable component 3, a linkage mechanism 4, a chain guide, and a motor module 1; wherein, the motor module 1 is disposed on the base component 2, and the motor module 1 is used to drive the movable component 3 to move relative to the base component 2.

[0048] See Figures 1-8 The base component 2 is provided with an installation position 14 (installation position 14 can also be called an installation area), which is the location (area) where the base component 2 is connected to the bicycle frame 17; the linkage mechanism 4 is hinged between the base component 2 and the movable component 3, and the chain guide is provided on the movable component 3. The chain guide includes a guide wheel 5 and a tension wheel 6; wherein, the guide wheel 5 has a wheel plane 15, and the installation position 14 has a reference point 16, which is a reference point 16 closest to the radial center plane of the bicycle's rear wheel; when When the chain is at the smallest flywheel sprocket 28, the distance L between the reference point 16 and the wheel plane 15 is greater than or equal to 0. When the distance L between the reference point 16 and the wheel plane 15 is greater than 0, as the chain moves from the smallest flywheel sprocket 28 to the largest flywheel sprocket 28, the wheel plane 15 will gradually move closer to the reference point 16 and then away from the reference point 16. When the distance L between the reference point 16 and the wheel plane 15 is equal to 0 (i.e., the reference point 16 coincides with the wheel plane 15), as the chain moves from the smallest flywheel sprocket 28 to the largest flywheel sprocket 28, the wheel plane 15 will gradually move away from the reference point 16.

[0049] See Figures 1-10The motor module 1 is mounted on the base component 2. 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 of the first link 4-1 is hinged to the base component 2, and the other end is hinged to the movable component 3. One end of the second link 4-2 is hinged to the base component 2, and the other end is hinged to the movable component 3. The output end of the motor module 1 is connected to the second link 4-2. During gear shifting, 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 achieving gear shifting. The base component 2 facilitates the installation of the motor module 1, and the location of the second link 4-2 below the first link 4-1 allows for better connection between the motor module 1 and the second link 4-2, ensuring the compactness of the structure.

[0050] See Figures 7-8 The number of the second link 4-2 is two.

[0051] See Figures 1-10 The motor module 1 includes a housing 1-1 fixed on the base component 2, a drive shaft 1-2 rotatably mounted on the housing 1-1, 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.

[0052] See Figures 1-10 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.

[0053] See Figures 1-10 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.

[0054] See Figures 1-10The base component 2 includes an L-shaped housing 2-1 and a mounting portion 2-2 disposed on the L-shaped housing 2-1. The mounting portion 2-2 is used to connect the bicycle frame 17. The mounting position 14 is located on the mounting portion 2-2. 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.

[0055] See Figures 1-10 The distance L between reference point 16 and the wheel plane 15 refers to the distance L when reference point 16 is perpendicular to the wheel plane 15. The bicycle freewheel includes multiple freewheel plates 28 with different diameters, corresponding to different gears. The freewheel is coaxially arranged with the bicycle rear wheel. The radial center plane is a plane perpendicular to the axis of the bicycle rear wheel and parallel to the radial direction of the bicycle rear wheel.

[0056] See Figures 1-10 When the distance L between reference point 16 and the wheel plane 15 is greater than 0, and when the chain moves from the smallest freewheel sprocket 28 towards the largest freewheel sprocket 28, the wheel plane 15 will gradually approach the mounting position 14, then intersect with the mounting position 14, and finally move away from the mounting position 14. In this structure, when the chain moves from the smallest freewheel sprocket 28 towards the largest freewheel sprocket 28, the wheel plane 15 will gradually approach the mounting position 14, then intersect with the mounting position 14, and finally move away from the mounting position 14. This indicates that the mounting position 14 is located between the largest and smallest freewheel sprockets. When the chain is at the smallest freewheel sprocket position, the axial profile of the electromechanical rear derailleur will not extend too far beyond the outer side of the frame 17, making the entire electromechanical rear derailleur almost hidden inside the frame 17. The entire electromechanical rear derailleur structure is more compact and has a lower profile, which improves riding safety. The axial profile refers to the axial profile of the bicycle's rear wheel.

[0057] See Figures 1-10 When the chain is at the smallest freewheel sprocket 28, the mounting position 14 intersects with the wheel plane 15. As the chain moves from the smallest freewheel sprocket 28 towards the largest freewheel sprocket 28, the wheel plane 15 gradually moves away from the mounting position 14. In this structure, when the chain is at the smallest freewheel sprocket 28, the axial profile of the electromechanical rear derailleur will not extend too far beyond the outer side of the frame 17. If the distance L between the reference point 16 and the wheel plane 15 is greater than 0, the mounting position 14 may intersect with the wheel plane 15. If the distance L between the reference point 16 and the wheel plane 15 is equal to 0, it indicates that the reference point 16 is located on the wheel plane 15, and therefore the mounting position 14 intersects with the wheel plane 15.

[0058] See Figures 1-10As the chain moves from the smallest freewheel sprocket 28 towards the largest freewheel sprocket 28, the wheel plane 15 gradually approaches the base member 2, then intersects with the base member 2, and finally moves away from the base member 2. The purpose is that the mounting position 14 is one area on the base member 2, and the above structure places the base member 2 between the largest and smallest freewheel sprockets 28. Therefore, the mounting position 14 is also located between the largest and smallest freewheel sprockets 28, further improving the compactness of the base member 2, allowing the electromechanical rear derailleur to be almost entirely hidden inside the frame 17.

[0059] See Figures 1-10 The mounting part 2-2 is provided with a mounting groove 2-21, and the frame 17 is provided with a downwardly protruding mounting protrusion 17-1. The mounting groove 2-21 and the mounting protrusion 17-1 are connected in a mating manner. The mounting groove 2-21 is located at mounting position 14, and the side and bottom positions of the mounting groove 2-21 constitute mounting position 14. In this embodiment, reference point 16 is located at the side position. In the above structure, by setting the mounting groove 2-21 and the mounting protrusion 17-1, the two cooperate with each other to achieve quick installation.

[0060] See Figures 1-10 The mounting protrusion 17-1 is disposed on the lower end face of the frame 17 and located at the front end of the bicycle rear axle. Its purpose is that, by being disposed on the lower end face of the frame 17 at the front end of the bicycle rear axle, the electromechanical rear derailleur, after installation, is closer to the inner side of the frame 17 and extends outward by a smaller distance L.

[0061] See Figures 1-2 The base component 2 is connected to the mounting protrusion 17-1 by mounting bolts. The mounting bolts facilitate installation and disassembly.

[0062] See Figures 1-7 The mounting groove 2-21 and the mounting protrusion 17-1 both have rectangular cross-sections. This is to facilitate installation and positioning.

[0063] See Figures 1-7 The wheel plane 15 is perpendicular to the axis of the guide sprocket 5, and the wheel plane 15 is located at the center of the guide sprocket 5. The wheel plane 15 can also be a plane formed by the guide sprocket 5 and the tensioning wheel 6.

[0064] See Figures 1-7 The mounting protrusion 17-1 is provided with a mounting through hole for the mounting bolt to pass through. The purpose of this is that the mounting bolt passing through the mounting through hole can better connect the mounting protrusion 17-1 to the base component 2.

[0065] See Figures 1-7There are multiple flywheel blades 28, and different flywheel blades 28 correspond to different gears. The smallest flywheel blade 28 is located outside the largest flywheel blade 28.

[0066] See Figures 1-14 The electromechanical rear derailleur in this embodiment also includes a power supply 21; the power supply 21 is disposed on the movable component 3 and is used to supply power to the motor module 1.

[0067] See Figures 1-14 The movable component 3 is provided with a power supply mounting slot 22, and the power supply 21 is disposed on the power supply mounting slot 22. One end of the power supply mounting slot 22 and one end of the power supply 21 are provided with a plug-in structure, and the other end of the power supply mounting slot 22 and the other end of the power supply 21 are provided with a fastening structure.

[0068] See Figures 13-14 The plug-in structure includes a slot 23 disposed at one end of the power 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.

[0069] See Figures 13-14 The fastening mechanism includes a fastening member 25 hinged to the other end of the power supply mounting slot 22 and a fastening slot 26 provided 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 slot 26. The power supply mounting slot 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 slot 26 to fix the power supply 21. For disassembly, the fastening member 25 is pushed outwards, the fastening hook 27 disengages from the fastening slot 26, the tongue 24 separates from the slot 23, and the power supply 21 can be removed. The operation is very convenient.

[0070] See Figures 1-13The 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 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 chain guide also includes a tension arm 7. The first end of the tension arm 7 is rotatably connected to the end of the inner guide plate 3-1. The tension wheel 6 is rotatably disposed at the second end of the tension arm 7. The axis of rotation of the tension arm 7 does not coincide with the axis of rotation of the sprocket 5. A reset component is provided at the rotatable connection between the tension arm 7 and the inner guide plate 3-1. When the chain switches between different flywheel plates 28 or when the bicycle is folded, the chain guide keeps the chain under tension. Because the chain guide wheel 5 is mounted on the movable component 3 and the tension wheel 6 is mounted on the tension arm 7, and the axis of rotation of the tension arm 7 does not coincide with the axis of rotation of the chain guide wheel 5, the chain guide has a large tension range on the chain, which can absorb additional slack in the chain. When the bicycle is folded, the chain guide maintains tension on the chain.

[0071] See Figures 1-13 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 17 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 electromechanical rear derailleur structure very compact.

[0072] See Figures 1-13 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 electromechanical rear derailleur, and the tensioning arm 7 will not interfere with the outer guide plate 3-2, so that the tensioning arm 7 has a larger range of rotation on the inner guide plate 3-1, thereby improving the tensioning range of the chain.

[0073] See Figures 1-13The 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.

[0074] See Figures 1-13 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.

[0075] See Figures 1-13 The 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.

[0076] See Figures 1-13 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.

[0077] See Figures 1-13 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 tensioning arm 7 from colliding with other components due to the excessive elasticity of the torsion spring 18, and play a role in safety limiting.

[0078] See Figures 1-13The bicycle in this embodiment includes a frame 17, a crank assembly, a freewheel, a chain, and an electromechanical rear derailleur. The crank assembly, freewheel, and electromechanical rear derailleur are all mounted on the frame 17. The chain is connected to the crank assembly, freewheel, and electromechanical rear derailleur. When the bicycle is folded, the distance between the axis of the crank assembly and the axis of the freewheel decreases. That is, when the bicycle is folded, the distance between the axis of the crank assembly and the axis of the freewheel is greater than the distance between the axis of the crank assembly and the axis of the freewheel when the bicycle is folded. The bicycle derailleur is used to tension the chain. The axis of the crank assembly is the axis of the freewheel sprocket 28 on the crank assembly. The freewheel can consist of one or more freewheel sprockets 28.

[0079] See Figures 1-13 The working principle of the aforementioned low-profile electromechanical rear derailleur is as follows:

[0080] During gear shifting, motor module 1 operates, driving movable component 3 to move relative to base component 2, which in turn moves chain guide component. This allows the chain guide component to obtain the positions of various flywheel segments 28. The chain is then actuated by the movement of movable component 3 and chain guide component, switching between different flywheel segments 28 to achieve gear shifting. When the distance L between reference point 16 and wheel plane 15 is greater than 0, as the chain moves from the smallest flywheel segment 28 to the largest flywheel segment 28, wheel plane 15 gradually approaches and then moves away from reference point 16. When the distance L between reference point 16 and wheel plane 15 is equal to 0, as the chain moves from the smallest flywheel segment 28 to the largest flywheel segment 28, wheel plane 15 gradually moves away from reference point 16. The reference point 16 is closer to the freewheel 28, meaning that the mounting position 14 is either next to the smallest freewheel 28 or located between the largest and smallest freewheel 28. When the chain is located at the smallest freewheel 28, the axial profile of the rear derailleur will not extend too far beyond the outside of the frame 17, making the entire rear derailleur almost hidden inside the frame 17. The entire rear derailleur structure is more compact and has a lower profile, which can improve riding safety.

[0081] Example 2

[0082] 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 guide, the base component 2, or the linkage mechanism 4. The mounting part 2-2 can be a mounting plate, which is fixed to the frame 17 with screws. The mounting plate has a mounting surface on its inner side, which directly contacts the frame 17 and forms the mounting position. The reference point 16 is located on the mounting surface.

[0083] 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. A low-profile electromechanical rear derailleur, characterized in that, It includes a base component, moving components, linkage mechanism, chain guide, and motor module; among which, The motor module is mounted on the base component, the movable component, or the linkage mechanism, and is used to drive the movable component to move relative to the base component. The base component has an installation position, which is the location where the base component connects to the bicycle frame. The linkage mechanism is hinged between the base component and the movable component. The chain guide is disposed on the movable component and includes a guide wheel and a tension wheel. The guide wheel has a wheel plane, and the installation position has a reference point, which is a reference point closest to the radial center plane of the bicycle's rear wheel. When the chain is at the smallest freewheel, the distance between the reference point and the wheel plane is greater than or equal to 0. When the distance between the reference point and the wheel plane is greater than 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches the reference point and then moves away from it. When the distance between the reference point and the wheel plane is equal to 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually moves away from the reference point.

2. The low-profile electromechanical rear derailleur according to claim 1, 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.

3. A low-profile electromechanical rear derailleur according to claim 2, 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.

4. A low-profile electromechanical rear derailleur according to claim 3, characterized in that, The axis of the motor is perpendicular to the axis of the drive shaft.

5. A low-profile electromechanical rear 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. The mounting position is located on the mounting part. The motor module is installed in the space enclosed by the L-shaped housing.

6. A low-profile electromechanical rear derailleur according to claim 1, characterized in that, As the chain moves from the smallest sprocket to the largest sprocket, the wheel plane gradually approaches the mounting position, then intersects with the mounting position, and finally moves away from the mounting position.

7. A low-profile electromechanical rear derailleur according to claim 1, characterized in that, When the chain is at the smallest sprocket position, the mounting position intersects with the wheel plane; as the chain moves from the smallest sprocket to the largest sprocket, the wheel plane gradually moves away from the mounting position.

8. A low-profile electromechanical rear derailleur according to claim 6, characterized in that, As the chain moves from the smallest sprocket to the largest sprocket, the wheel plane gradually approaches the base component, then intersects with the base component, and finally moves away from the base component.

9. A low-profile electromechanical rear derailleur, comprising a base component, a movable component, a linkage mechanism, a chain guide, a motor module, and a power supply; wherein, The motor module is mounted on the base component, the movable component, or the linkage mechanism, and is used to drive the movable component to move relative to the base component. The power supply is located on the base component, movable component, linkage mechanism, or chain guide, and is used to supply power to the motor module. The base component has an installation position, which is the location where the base component connects to the bicycle frame. The linkage mechanism is hinged between the base component and the movable component. The chain guide is disposed on the movable component and includes a guide wheel and a tension wheel. The guide wheel has a wheel plane, and the installation position has a reference point, which is a reference point closest to the radial center plane of the bicycle's rear wheel. When the chain is at the smallest freewheel, the distance between the reference point and the wheel plane is greater than or equal to 0. When the distance between the reference point and the wheel plane is greater than 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually approaches the reference point and then moves away from it. When the distance between the reference point and the wheel plane is equal to 0, as the chain moves from the smallest freewheel to the largest freewheel, the wheel plane gradually moves away from the reference point.

10. A low-profile electromechanical rear derailleur according to claim 9, characterized in that, The movable component is provided with a power supply mounting slot, and the power supply is mounted on the power supply mounting slot. One end of the power supply mounting slot is connected to one end of the power supply via a plug-in structure, and the other end of the power supply mounting slot is connected to the other end of the power supply via a fastening structure. The plug-in structure includes a slot at one end of the power 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 power supply mounting slot 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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