Electric power-assisted bicycle gear shifting system

Abstract

The invention discloses an electric power-assisted bicycle gear shifting system, and belongs to the technical field of electric power-assisted bicycles, the electric power-assisted bicycle gear shifting system comprises a controller, the controller is respectively connected with a front gear shifting assembly and a rear gear shifting assembly, the front gear shifting assembly comprises a fixed lantern ring, a front driving structure is mounted on one side of the fixed lantern ring, and the front driving structure is connected with a front chain shifting structure; the rear gear shifting assembly comprises a rear driving structure, and the rear driving structure is connected with the rear chain shifting structure. According to the electric power-assisted bicycle gear shifting system, the front driving structure and the rear driving structure are arranged, so that the action is more accurate and reliable, the efficiency and precision of the front gear shifting assembly and the rear gear shifting assembly are improved, manpower can be saved, inaccurate speed change caused by line lengthening can be avoided, and the service life of the electric power-assisted bicycle is prolonged. The controller is arranged on the handlebar and can control the front gear shifting assembly and the rear gear shifting assembly to conduct gear shifting operation, the button is arranged on the controller, control is convenient, and manpower is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric-assisted bicycles, and in particular to a gear shifting system for electric-assisted bicycles. Background Art

[0002] As a means of transportation that combines human-powered cycling with electric power, the core technological iterations of electric-assisted bicycles have consistently revolved around "riding efficiency" and "user experience." While traditional mechanical shifting systems (such as Shimano and SRAM's finger-shifting shifters) are well-established in human-powered bicycles, they exhibit significant drawbacks in electric-assisted scenarios. With electric power involved, riders must frequently shift gears based on the actual power output and road gradient. Traditional mechanical shifting mechanisms require manual shifting, which is cumbersome and prone to inaccurate shifting due to cable stretch. This can be especially detrimental in complex road conditions (such as hills and bumpy roads), forcing riders to focus on shifting, posing a safety hazard.

[0003] Traditional mechanical gear shifting relies on the shift cable to transmit operating force. After long-term use, the cable is prone to loosening and wear, resulting in shifting delays or reduced accuracy. Especially in the high-torque output scenario of electric-assisted bicycles, cable deformation may cause gear skipping or chain falling off. Summary of the Invention

[0004] The object of the present invention is to provide an electric-assisted bicycle shifting system, which is provided with a front drive structure and a rear drive structure, so that the actions of the front derailleur structure and the rear derailleur structure are more accurate and reliable, the efficiency and precision of the front shift assembly and the rear shift assembly are improved, the shifting is convenient, manpower is saved, and inaccurate speed change caused by a lengthened cable is avoided. A controller is provided on the handlebar to control the front shift assembly and the rear shift assembly to perform the shifting operation, and buttons are provided on the controller to facilitate control and save manpower.

[0005] To achieve the above-mentioned objectives, the present invention provides an electric-assisted bicycle shifting system, including a controller, which is respectively connected to a front shifting assembly and a rear shifting assembly. The front shifting assembly includes a fixed collar, and a front drive structure is installed on one side of the fixed collar, and the front drive structure is connected to a front derailleur structure; the rear shifting assembly includes a rear drive structure, and the rear drive structure is connected to a rear derailleur structure.

[0006] Preferably, the front drive structure includes an electric push rod, the bottom of the electric push rod is fixedly mounted on a fixed collar, the top of the electric push rod is fixedly connected to a slider, the slider is hinged to a first connecting rod, and the first connecting rod is hinged to the front derailleur structure.

[0007] Preferably, the front derailleur structure includes a second connecting rod, which is fixedly connected to the first derailleur plate and the second derailleur plate. The first derailleur plate and the second derailleur plate are connected by a guide plate, and the surfaces of the first derailleur plate, the second derailleur plate and the guide plate are all coated with a wear-resistant coating.

[0008] Preferably, the rear drive structure includes a rear drive housing, a motor is installed inside the rear drive housing, the motor is connected to the first gear through a first transmission shaft, the first gear is meshed with the second gear, and the diameter of the first gear is smaller than the diameter of the second gear.

[0009] Preferably, the rear derailleur structure includes a first rotating rod, the first rotating rod is connected to the second gear through the second transmission shaft, a second rotating rod is installed below the first rotating rod, one end of the second rotating rod is hinged to the rear drive housing, the first rotating rod and the second rotating rod are both hinged to the rotating block, a first sprocket is installed on one side of the rotating block, a mounting plate is installed between the rotating block and the first sprocket, and a second sprocket is installed on the end of the mounting plate close to the first sprocket.

[0010] Preferably, the rear drive housing is fixedly connected to the mounting rod, and a mounting hole is provided at the end of the mounting rod.

[0011] Therefore, the present invention adopts the above-mentioned electric power-assisted bicycle shifting system, which has the following beneficial effects: (1) Setting up the front drive structure and the rear drive structure makes the action of the front derailleur structure and the rear derailleur structure more accurate and reliable, improves the efficiency and precision of the front shift assembly and the rear shift assembly, facilitates shifting, saves manpower, and avoids inaccurate shifting due to lengthening of the cable; (2) A controller is provided on the handlebar to control the front shift assembly and the rear shift assembly to perform shifting operations. Buttons are provided on the controller to facilitate control and save manpower.

[0012] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of a front shift assembly of a shift system for an electric power-assisted bicycle according to the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of a rear shift assembly of a shift system for an electric-assisted bicycle according to the present invention; Figure 3 The present invention is a schematic structural diagram of a rear drive structure of a gear shifting system for an electric power-assisted bicycle. Attached photos

[0014] 21. Fixed collar; 22. Electric push rod; 23. Slider; 24. First connecting rod; 25. Second connecting rod; 26. First derailleur plate; 27. Second derailleur plate; 28. Guide plate; 31. Rear drive housing; 32. Motor; 33. First transmission shaft; 34. First gear; 35. Second gear; 36. Second transmission shaft; 37. First rotating rod; 38. Second rotating rod; 39. Rotating block; 310. First sprocket; 311. Mounting plate; 312. Second sprocket; 313. Mounting rod. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0016] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0017] Example 1 like Figures 1 to 3 As shown, the present invention provides an electric-assisted bicycle shifting system, including a controller mounted on the handlebars and provided with control buttons. Pressing the control buttons controls the front and rear shift assemblies to shift gears. The controller is connected to the front and rear shift assemblies, respectively. As the core control component of the system, the controller is connected to the front and rear shift assemblies, controlling the movements of the front and rear shift assemblies to achieve the shifting function.

[0018] The front shift assembly includes a fixed collar 21, which serves as the mounting base for the front drive assembly, providing a fixed support structure and ensuring stable installation. The front drive structure is mounted on one side of the fixed collar 21 and connects to the front derailleur. This structure provides precise power output to the front derailleur, making its operation more accurate and reliable, and improving the efficiency and precision of front sprocket shifting.

[0019] The front drive structure includes an electric push rod 22, the bottom of which is fixedly mounted on a fixed collar 21. The top of the push rod 22 is fixedly connected to a slider 23. The frame of the electric-assisted bicycle is provided with a slot corresponding to the slider 23. The slider 23 is hinged to a first connecting rod 24, which is hinged to the front derailleur structure. The electric push rod 22 acts as a power source, driving the slider 23 through a telescopic movement. The slider 23 transmits power to the front derailleur structure through the first connecting rod 24, realizing the movement of the front derailleur and completing the shifting operation of the front sprocket.

[0020] The front derailleur structure includes a second link 25, which is hingedly connected to a fixed collar 21. A first link 24 drives the second link 25 to rotate about its hinged connection with the fixed collar 21. The second link 25 is fixedly connected to a first derailleur plate 26 and a second derailleur plate 27. Rotation of the second link 25 moves the first and second derailleur plates 26, 27, thereby shifting the chain and enabling front sprocket shifting. This allows the electric-assisted bicycle to select the appropriate front sprocket for different riding needs. The first and second derailleur plates 26, 27 are connected by a guide plate 28, which guides the chain and ensures smooth movement between the sprockets. The surfaces of the first and second derailleur plates 26, 27, and the guide plate 28 are all coated with a wear-resistant coating, which improves the wear resistance of the first and second derailleur plates 26, 27, and the guide plate 28, extending their service life.

[0021] The rear shift assembly includes a rear drive structure connected to the rear derailleur structure. This structure provides a more precise power output to the rear derailleur structure, making the rear derailleur's operation more accurate and reliable, and improving the efficiency and precision of rear sprocket shifting. The rear drive structure includes a rear drive housing 31, which provides protection and mounting space for components such as the motor 32 and gears. The rear drive housing 31 is fixedly connected to a mounting rod 313, the distal end of which is defined by a mounting hole. The rear drive housing 31 is connected to other bicycle components via the mounting rod 313. The mounting hole is used to install fixtures to ensure the secure installation of the rear drive assembly, enabling proper operation.

[0022] A motor 32 is mounted within the rear drive housing 31. The motor 32 is connected to a first gear 34 via a first transmission shaft 33. The first gear 34 meshes with a second gear 35. The power provided by the motor 32 is transmitted to the second gear 35 via the first transmission shaft 33 and the first gear 34. The diameter of the first gear 34 is smaller than that of the second gear 35, enabling a reduction in speed.

[0023] The rear derailleur structure includes a first rotating rod 37, which is connected to the second gear 35 via a second transmission shaft 36. The rotation of the second gear 35 can drive the rotation of the first rotating rod 37 via the second transmission shaft 36. A second rotating rod 38 is mounted below the first rotating rod 37. One end of the second rotating rod 38 is hinged to the rear drive housing 31. The first and second rotating rods 37, 38 are both hinged to a rotating block 39. The second rotating rod 38 is hinged to the first rotating rod 37 and the rear drive housing 31, supporting and guiding the rotating block 39. The rotating block 39 moves under the drive of the first and second rotating rods 37, 38. A first sprocket 310 is installed on one side of the rotating block 39, and a mounting plate 311 is installed between the rotating block 39 and the first sprocket 310. The rotating block 39 and the mounting plate 311 are connected through the structure of the existing technology. A second sprocket 312 is installed on the end of the mounting plate 311 near the first sprocket 310. The first sprocket 310 is in direct contact with the chain, and its main function is to guide the chain to accurately enter and leave different flywheels. The second sprocket 312 can compensate for the length change of the chain when switching on different flywheels.

[0024] When using the electric-assisted bicycle shifting system provided by the present invention, the front derailleur structure is mounted on the frame using a fixed collar 21, and the rear derailleur structure is mounted on the frame using a fixed rod. When the front sprocket needs to be shifted, the controller is pressed, and the controller sends a command to the electric push rod 22 in the forward drive assembly. After the bottom of the electric push rod 22 receives the command, the slider 23 at the top of the electric push rod 22 moves as the electric push rod 22 expands and contracts. The slider 23 transmits power to the second link 25 of the front derailleur structure through the hinged first link 24. The second link 25 drives the first derailleur plate 26 and the second derailleur plate 27 fixedly connected thereto to move. The first derailleur plate 26 and the second derailleur plate 27 are connected by a guide plate 28. They work together to guide the chain to different front sprockets, thereby achieving the shifting of the front sprockets.

[0025] When the rear sprocket needs to shift gears, the controller is pressed, sending a command to the motor 32 mounted inside the rear drive housing 31. The motor 32 starts, driving the first gear 34 to rotate via the first transmission shaft 33. The first gear 34 meshes with the second gear 35. Because the diameter of the first gear 34 is smaller than that of the second gear 35, this achieves a torque-increasing effect, allowing the second gear 35 to rotate at an appropriate torque and speed. The second gear 35 is connected to the first rotating rod 37 via the second transmission shaft 36, driving the first rotating rod 37 to rotate. A second rotating rod 38, below the first rotating rod 37, is hinged at one end to the rear drive housing 31. The first and second rotating rods 37 and 38 work together to move the rotating block 39. A first sprocket 310 is installed on one side of the rotating block 39, and a second sprocket 312 is installed at the end of the mounting plate 311 between the rotating block 39 and the first sprocket 310, close to the side of the first sprocket 310. The movement of the rotating block 39 changes the meshing position of the first sprocket 310 and the second sprocket 312 with the chain, thereby guiding the chain to different rear sprockets, completing the rear sprocket shifting operation.

[0026] Therefore, the present invention adopts the above-mentioned electric-assisted bicycle shifting system, and sets a front drive structure and a rear drive structure, so that the actions of the front derailleur structure and the rear derailleur structure are more accurate and reliable, the efficiency and precision of the front shift assembly and the rear shift assembly are improved, the shifting is convenient, manpower is saved, and inaccurate speed shifting due to the lengthening of the cable is avoided. A controller is set on the handlebar to control the front shift assembly and the rear shift assembly to perform shifting operations, and buttons are set on the controller for convenient control and saving manpower.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A gear shifting system for an electric power-assisted bicycle, characterized in that: It includes a controller, which is respectively connected to the front shift assembly and the rear shift assembly. The front shift assembly includes a fixed collar, and a front drive structure is installed on one side of the fixed collar. The front drive structure is connected to the front derailleur structure; the rear shift assembly includes a rear drive structure, and the rear drive structure is connected to the rear derailleur structure.

2. The electric-assisted bicycle shifting system according to claim 1, characterized in that: The front drive structure includes an electric push rod, the bottom of which is fixedly mounted on a fixed collar, the top of which is fixedly connected to a slider, the slider is hinged to a first connecting rod, and the first connecting rod is hinged to a front derailleur structure.

3. The electric-assisted bicycle shifting system according to claim 1, characterized in that: The front derailleur structure includes a second connecting rod, which is fixedly connected to the first derailleur plate and the second derailleur plate. The first derailleur plate and the second derailleur plate are connected by a guide plate. The surfaces of the first derailleur plate, the second derailleur plate and the guide plate are all coated with a wear-resistant coating.

4. The electric-assisted bicycle shifting system according to claim 1, characterized in that: The rear drive structure includes a rear drive housing, a motor is installed inside the rear drive housing, the motor is connected to the first gear through a first transmission shaft, the first gear is meshed with the second gear, and the diameter of the first gear is smaller than the diameter of the second gear.

5. The electric-assisted bicycle shifting system according to claim 1, characterized in that: The rear derailleur structure includes a first rotating rod, which is connected to the second gear through a second transmission shaft, a second rotating rod is installed under the first rotating rod, one end of the second rotating rod is hinged to the rear drive housing, the first rotating rod and the second rotating rod are both hinged to the rotating block, a first sprocket is installed on one side of the rotating block, a mounting plate is installed between the rotating block and the first sprocket, and a second sprocket is installed on the end of the mounting plate close to the first sprocket.

6. The electric-assisted bicycle shifting system according to claim 1, characterized in that: The rear drive housing is fixedly connected to the mounting rod, and a mounting hole is provided at the end of the mounting rod.

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