Rear fork shaft hole strengthening structure of electric power-assisted bicycle

Abstract

The utility model discloses a rear fork shaft hole strengthening structure of an electric power-assisted bicycle, which is characterized in that the inner sides of rear fork shaft holes on the two sides of a frame of the electric power-assisted bicycle are respectively provided with a containing groove, a motor rotation stopping sheet is arranged in the containing groove of the left rear fork shaft hole, a right rear fork containing groove is connected with a hook claw, the motor rotation stopping sheet is provided with a first through hole for a shaft rod to penetrate through, and the hook claw is provided with a second through hole for a shaft rod to penetrate through. The first through hole is coaxial with the left rear fork shaft hole. Compared with the prior art, the rear fork shaft hole has the advantages that the strength and durability of the rear fork shaft hole of the electric power-assisted bicycle frame can be improved, and maintenance and replacement are convenient.

Description

Technical Field

[0001] This utility model relates to the field of electric-assisted bicycle technology, and in particular to a reinforced structure for the rear fork shaft hole of an electric-assisted bicycle. Background Technology

[0002] In traditional e-bike manufacturing, frames are typically made of alloy materials to meet basic requirements for strength and durability. However, with the increasing trend towards lightweight e-bikes, high-end e-bikes are increasingly using carbon fiber frames. Carbon fiber frames are widely favored for their light weight and high strength, but they also have some structural shortcomings.

[0003] For example, in the rear fork axle hole area of ​​a carbon fiber frame e-bike, the axle hole is crucial for securing the wheel axle, especially in e-bikes with thru-axle motors. During riding, the weight of the thru-axle motor and the torque generated during its rotation act directly on the rear fork axle hole through the axle shaft, making it highly susceptible to damage or cracking. This damage not only affects the frame's lifespan but can also jeopardize riding safety. Furthermore, because carbon fiber cannot be effectively repaired using traditional welding or other methods, once the axle hole is damaged, the entire frame usually needs to be replaced, resulting in significant financial losses and resource waste for the user.

[0004] Therefore, regarding the strength issue of the rear fork axle hole in the carbon fiber frame of electric-assist bicycles, there is an urgent need for an effective reinforcement structure to improve the durability of this part, extend the service life of the frame, and reduce maintenance costs. Solving this problem will significantly improve the reliability and user experience of carbon fiber electric-assist bicycles. Utility Model Content

[0005] To address this problem, this utility model proposes a reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle, including an electric-assisted bicycle frame with a rear fork. The structure is characterized by: an accommodating groove provided on the inner side of the left rear fork shaft hole of the electric-assisted bicycle frame; a motor anti-rotation plate provided within the accommodating groove; and a first through hole for the axle to pass through the motor anti-rotation plate, the first through hole being coaxial with the left rear fork shaft hole.

[0006] Furthermore, the receiving groove has a first locking hole, and the motor anti-rotation plate has a second locking hole, with the first locking hole and the second locking hole corresponding to each other; it also includes a locking member, which locks into the second locking hole and the first locking hole, thereby locking and fixing the motor anti-rotation plate in the receiving groove.

[0007] Furthermore, the receiving groove is further provided with a positioning notch, and the motor anti-rotation plate is provided with a positioning boss, with the positioning notch and the positioning boss matching and corresponding.

[0008] Furthermore, the motor anti-rotation plate includes a locking boss, a first through hole passing through the locking boss, a first internal thread provided in the first through hole, and the locking boss being inserted into the left rear fork shaft hole; it also includes a first fixing screw, the first fixing screw being provided with a first external thread and the center of the first fixing screw having a first screw through hole, the first fixing screw passing through the rear fork shaft hole from the outside of the rear fork shaft hole and the first external thread of the first fixing screw locking and fixing with the first internal thread of the first through hole.

[0009] Furthermore, a receiving groove is also provided inside the right rear fork axle hole of the electric bicycle frame, and a hook is connected to the right rear fork receiving groove.

[0010] Furthermore, the hook includes a connecting boss with a connecting through hole in the center of the connecting boss and a second internal thread thereon. The connecting boss is inserted into the right rear fork shaft hole. It also includes a second fixing screw with a second screw through hole and a second external thread. The second fixing screw passes through the right rear fork shaft hole from the outside of the right rear fork and the second external thread of the second fixing screw is locked and fixed with the second internal thread.

[0011] Furthermore, the frame of the electric-assist bicycle is made of carbon fiber.

[0012] Furthermore, the motor anti-rotation plate is made of aluminum alloy.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] (1) Improve strength and durability: By setting an aluminum alloy motor anti-rotation plate at the rear fork shaft hole of the electric-assist bicycle frame, the strength of the shaft hole is effectively enhanced, avoiding damage or cracking caused by the wheel axle force, thereby improving the durability of the frame.

[0015] (2) Easy to maintain and replace: The motor anti-rotation plate is fixed to the rear fork shaft hole through the receiving groove and locking part or through the first fixing screw. If it is damaged, only the motor anti-rotation plate needs to be replaced, without replacing the entire frame, which greatly reduces maintenance costs and reduces resource waste.

[0016] (3) Adapting to the needs of the high-end market: This design fully solves the pain points of carbon fiber frames in actual use, improves the reliability and user experience of the frames, and meets the comprehensive needs of the high-end electric bicycle market for lightweight and high performance.

[0017] Therefore, this invention has significant advantages in improving the reliability of carbon fiber frames for electric bicycles, extending their service life, reducing maintenance costs, and optimizing user experience. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the frame structure of an electric-assisted bicycle according to Embodiment 1 of this utility model.

[0019] Figure 2 This is a structural diagram of the rear fork position of the electric-assisted bicycle frame in Embodiment 1 of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure at the rear fork shaft hole in Embodiment 1 of this utility model.

[0021] Figure 4 This is a schematic diagram of the rear fork shaft hole at another angle in Embodiment 1 of this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of Embodiments 2 and 3 of this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of Embodiments 2 and 3 of this utility model from another angle.

[0024] Figure 7 This is a schematic diagram of the motor anti-rotation plate structure in Embodiment 2 of this utility model.

[0025] Figure 8 This is a schematic diagram of the hook structure in Embodiment 2 of this utility model.

[0026] Figure Labels

[0027] 100 Electric bicycle frame 113 First locking hole

[0028] 110 Left rear fork 114 Positioning notch

[0029] 120 Right Rear Fork 13 Motor Anti-Rotation Plate

[0030] 111 Left rear fork shaft hole 130 First through hole

[0031] 112 Receiving groove 131 Second locking hole

[0032] 132 Positioning boss 24 First fixing screw

[0033] 14 Locking component 240 First screw through hole

[0034] 210 Left rear fork 241 First external thread

[0035] 211 Left rear fork shaft hole 25 shaft

[0036] 212 Receiving slot 26 Hook claw

[0037] 220 Right Rear Fork 260 Connecting Through Hole

[0038] 221 Right rear fork shaft hole 261 Second internal thread

[0039] 222 Receiving slot 262 Connecting boss

[0040] 23 Motor anti-rotation plate 27 Second fixing screw

[0041] 230 First through hole; 270 Second screw through hole

[0042] 231 Locking boss 271 Second external thread

[0043] 232 First internal thread Detailed Implementation

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] Example 1

[0048] Please refer to Figures 1-4This is the first embodiment of the present invention, a reinforced structure for the rear fork shaft hole of an electric-assisted bicycle, including an electric-assisted bicycle frame 100, which includes a left rear fork 110 and a right rear fork 120. In this embodiment, the electric-assisted bicycle frame is made of carbon fiber. A receiving groove 112 is provided at the left rear fork shaft hole 111 of the electric-assisted bicycle frame 100. A motor anti-rotation plate 13 is provided in the receiving groove 112. The motor anti-rotation plate 13 has a first through hole 130 for the wheel axle to pass through. In addition, a first locking hole 113 is also provided in the receiving groove 112, and a second locking hole 131 is provided in the motor anti-rotation plate 13. The locking member 14 can lock and fix the motor anti-rotation plate 13 in the receiving groove 112 through the second locking hole 131 and the first locking hole 113. Through this locking method, not only can the motor anti-rotation plate 13 be stably installed, but it also provides convenience for subsequent disassembly and replacement, reducing maintenance costs and resource waste. In this embodiment, the motor anti-rotation plate 13 is made of aluminum alloy. Aluminum alloy has excellent strength and processing performance. As a reinforcing structural material, it can greatly improve the durability of the left rear fork shaft hole 111 and effectively solve the problem that carbon fiber material is easily damaged at this position.

[0049] To ensure the motor anti-rotation plate 13 can be quickly and stably placed in the receiving groove 112, the receiving groove 112 is further provided with a positioning recess 114, and the motor anti-rotation plate 13 is provided with a positioning boss 132, with the positioning recess 114 and the positioning boss 132 matching and corresponding. This structural design ensures the precise positioning of the motor anti-rotation plate 13, avoids offset during installation, and further improves the installation firmness of the motor anti-rotation plate 13, ensuring that it will not loosen during use.

[0050] Example 2

[0051] Please refer to Figures 5-8 This is the second embodiment of the present invention. Structures not mentioned in this embodiment are the same as in Embodiment 1 and will not be described again here. In this embodiment, the motor anti-rotation plate 23 includes a locking boss 231, a first through hole 230 passing through the locking boss 231, and a first internal thread 232 provided in the first through hole 230. The locking boss 231 is inserted into the left rear fork shaft hole 211. It further includes a first fixing screw 24, which has a first external thread 241 and a first screw through hole 240 passing through its center. The first fixing screw 24 passes through the left rear fork shaft hole 211 from the outside, and the first external thread 241 of the first fixing screw 24 locks and fixes with the first internal thread 232 of the first through hole 230. Thus, the motor anti-rotation plate 23 can be fixed in the receiving groove 212 of the left rear fork shaft hole 211 by the first fixing screw 24. The first through hole 230 and the first screw through hole 240 are used to allow the shaft 25 to pass through.

[0052] When in use, when the rear wheel with the motor is installed between the left and right rear forks 210 and 220 of the frame, the axle 25 can pass through the first screw through hole 240 of the first fixing screw 24 from the outside of the left rear fork 210, then through the first through hole 230 of the motor anti-rotation plate 23, and then through the motor bottom shaft and the right rear fork shaft hole, so that the rear wheel with the motor can be fixed between the two rear forks 210 and 220.

[0053] Example 3

[0054] Please continue to refer to this. Figures 5-8 An accommodating groove 222 is also provided inside the right rear fork shaft hole 221 of the electric bicycle frame, and a hook 26 is connected to the accommodating groove 222 of the right rear fork 220. The hook 26 includes a connecting boss 262, a connecting through hole 260 passing through the center of the connecting boss 262, and a second internal thread 261 provided in the connecting through hole 260. The connecting boss 262 is inserted into the right rear fork shaft hole 221, and further includes a second fixing screw 27. The second fixing screw 27 passes through a second screw through hole 270 and is provided with a second external thread 271. The second fixing screw 27 passes through the right rear fork shaft hole 221 from the outside of the right rear fork 220, and the second external thread 271 of the second fixing screw 27 is locked and fixed with the second internal thread 261.

[0055] This utility model relates to a reinforced structure for the rear fork shaft holes of an electric-assisted bicycle. The frame 100 of the electric-assisted bicycle is made of carbon fiber. Utilizing the lightweight and high strength characteristics of carbon fiber, the overall weight of the electric-assisted bicycle can be reduced. By combining the carbon fiber frame with aluminum alloy motor anti-rotation plates 13 and 23, both lightweight and strength requirements are taken into account. In particular, it provides an effective solution to the problem of easy damage to the left and right rear fork shaft holes, which significantly improves the reliability of the frame and the user experience.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle, comprising an electric-assisted bicycle frame, the electric-assisted bicycle frame having a rear fork, characterized in that: The electric bicycle frame has a receiving groove inside the left rear fork shaft hole, and a motor anti-rotation plate is provided in the receiving groove. The motor anti-rotation plate has a first through hole for the shaft rod to pass through, and the first through hole is coaxial with the left rear fork shaft hole.

2. The reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle according to claim 1, characterized in that, The receiving groove has a first locking hole, and the motor anti-rotation plate has a second locking hole, with the first locking hole and the second locking hole corresponding to each other; it further includes a locking member, which locks into the second locking hole and the first locking hole, thereby locking and fixing the motor anti-rotation plate in the receiving groove.

3. The reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle according to claim 2, characterized in that, The receiving groove is further provided with a positioning notch, and the motor anti-rotation plate is provided with a positioning boss. The positioning notch matches and corresponds to the positioning boss.

4. The reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle according to claim 1, characterized in that, The motor anti-rotation plate includes a locking boss, a first through hole passing through the locking boss, a first internal thread being provided in the first through hole, and the locking boss being inserted into the left rear fork shaft hole; it further includes a first fixing screw, the first fixing screw being provided with a first external thread and the center of the first fixing screw passing through a first screw through hole, the first fixing screw passing through the rear fork shaft hole from the outside of the rear fork shaft hole and the first external thread of the first fixing screw locking and fixing with the first internal thread of the first through hole.

5. The reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle according to claim 1, characterized in that, Furthermore, a receiving groove is also provided inside the right rear fork shaft hole of the electric bicycle frame, and the right rear fork receiving groove is connected to a hook.

6. The reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle according to claim 5, characterized in that, The hook includes a connecting boss with a connecting through hole at its center. The connecting through hole has a second internal thread, and the connecting boss is inserted into the right rear fork shaft hole. It further includes a second fixing screw with a second screw through hole and a second external thread. The second fixing screw passes through the right rear fork shaft hole from the outside of the right rear fork, and the second external thread of the second fixing screw is locked and fixed with the second internal thread.

7. A reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle according to any one of claims 2 to 6, characterized in that, The frame of the electric-assist bicycle is made of carbon fiber.

8. A reinforcing structure for the rear fork shaft hole of an electric-assisted bicycle according to any one of claims 2 to 6, characterized in that, The motor anti-rotation plate is made of aluminum alloy.

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