Bicycle flywheel made of carbon fibers

Abstract

The utility model belongs to the technical field of bicycle flywheel manufacturing, and particularly relates to a bicycle flywheel made of carbon fibers, which comprises a ratchet part, a crankset is fixedly mounted on the outer side of the ratchet part, a heat dissipation part is fixedly connected to the front side of the ratchet part, a plurality of groups of positioning blocks are uniformly and fixedly connected to the outer surface of the ratchet part, and clamping grooves are formed in the rear parts of the positioning blocks. The inner wall of the chain wheel is rotatably connected with a rotating ring, the rotating ring is slidably connected to the inner wall of the clamping groove, the inner side of the rotating ring is provided with a groove matched with the positioning block in shape, the rear side of the rotating ring is fixedly connected with a pull rod slidably arranged on the inner wall of the chain wheel, the inner wall of the chain wheel is provided with an inserting groove, and the positioning block is matched with the inserting groove in an inserted mode. According to the flywheel, the rotating ring is fixed to the inner wall of the crankset through the fastening bolt, the crankset and the ratchet wheel part can be separated through the rotating ring only by unscrewing the bolt during disassembly, the maintenance time is saved compared with an overall disassembly mode of a traditional flywheel, and abrasion parts can be conveniently and independently replaced.

Description

Technical Field

[0001] This application belongs to the field of bicycle flywheel manufacturing technology, specifically a bicycle flywheel made of carbon fiber. Background Technology

[0002] In the field of bicycles, the freewheel is a key component of the transmission system. Through the ratchet mechanism, it achieves unidirectional transmission. When pedaling, it drives the rear wheel. When pedaling stops, the freewheel spins freely. It consists of a ratchet pawl and a ratchet ring. When pedaling the chainring, the chain drives the freewheel to rotate, the ratchet mechanism locks, and the rear wheel is driven forward. When pedaling stops, the ratchet pawl slips, the freewheel spins freely, and the rear wheel rotates due to inertia without dragging the chain backward.

[0003] With the popularization and professional development of cycling, users have placed higher demands on the lightweight, corrosion resistance and maintainability of freewheels. The rotational inertia caused by the heavy weight of traditional metal freewheels increases the rider's energy consumption. In addition, traditional freewheels mostly adopt a one-piece structure. When a component such as the chainring or ratchet wears out, the entire freewheel needs to be replaced. This not only results in high maintenance costs, but also a cumbersome disassembly process that requires special tools and consumes a lot of time. Therefore, it is necessary to design a bicycle freewheel made of carbon fiber to solve the above problems. Utility Model Content

[0004] The purpose of this application is to address the shortcomings of existing technologies by designing a carbon fiber bicycle flywheel using a combination of carbon fiber material, an innovative detachable chainring structure, and a convection cooling design. This solves the problems of traditional metal flywheels in existing technologies, such as high weight, high moment of inertia leading to increased energy loss for riders, and high maintenance costs and cumbersome disassembly due to their integral structure.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] A carbon fiber bicycle freewheel includes a ratchet assembly, a chainring fixedly mounted on the outer side of the ratchet assembly, a heat sink fixedly connected to the front side of the ratchet assembly, multiple sets of positioning blocks evenly fixedly connected to the outer surface of the ratchet assembly, a slot formed at the rear of each positioning block, a rotating ring rotatably connected to the inner wall of the chainring, the rotating ring slidably connected to the inner wall of the slot, a groove matching the shape of the positioning blocks formed on the inner side of the rotating ring, a pull rod fixedly connected to the rear side of the rotating ring and sliding on the inner wall of the chainring, a slot formed on the inner wall of the chainring, the positioning blocks engaging with the slot, and the rotating ring fixedly mounted on the inner wall of the chainring by a fastening bolt, the rear side of which is threaded to the inner wall of the chainring.

[0007] Preferably, the head of the fastening bolt is fixedly connected to a sleeve, and a rubber component is fixedly connected to the inner wall of the gear plate, the rubber component being inserted into the inner wall of the sleeve.

[0008] Preferably, the outer side of the rubber component is provided with an annular protrusion, and the inner wall of the sleeve is provided with an arc groove, wherein the annular protrusion of the rubber component and the arc groove of the sleeve are engaged and matched.

[0009] Preferably, the heat sink includes a heat sink ring a, which is fixedly connected to the front side of the ratchet component. The inner wall of the heat sink ring a has multiple sets of heat sink holes a radially formed, and the heat sink holes a are inclined.

[0010] Preferably, a heat dissipation ring b is fixedly connected to the front side of the ratchet component near the inner side of the heat dissipation ring a, and multiple sets of heat dissipation holes b are radially opened on the inner wall of the heat dissipation ring b, and the heat dissipation holes b are opened at an angle.

[0011] Preferably, the inclination direction of the heat dissipation hole b is opposite to that of the heat dissipation hole a.

[0012] Preferably, the ratchet, gear, and heat sink are made of carbon fiber.

[0013] Compared with the prior art, the beneficial effects of this application are:

[0014] 1. This application uses a rotating ring fixed to the inner wall of the chainring by fastening bolts. During disassembly, simply loosening the bolts allows the rotating ring to separate the chainring from the ratchet assembly. This saves maintenance time compared to the traditional method of disassembling the entire freewheel and facilitates the individual replacement of worn parts. Bicycle freewheels made of carbon fiber are lighter and more wear-resistant than traditional resin-based carbon fiber composite materials.

[0015] 2. In this application, the heat dissipation holes a of the heat sink and the heat dissipation holes b of the heat dissipation ring a are inclined in opposite directions to form a convection heat dissipation channel. When riding, the air generates a turbulence effect through the inclined channel, which improves the heat dissipation efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall device in this application;

[0017] Figure 2 This is a schematic diagram showing the disassembled overall device in this application;

[0018] Figure 3 This is a schematic diagram of the structure of the sleeve and rubber parts in this application;

[0019] Figure 4 This is a schematic diagram of the structural slope of the heat dissipation ring a in this application.

[0020] Among them, 1. ratchet; 2. toothed sprocket; 3. rubber parts; 4. heat sink; 41. heat sink ring a; 42. heat sink hole a; 43. heat sink ring b; 44. heat sink hole b; 5. positioning block; 6. slot; 7. rotating ring; 8. slot; 9. groove; 10. fastening bolt; 11. pull rod; 12. sleeve. Detailed Implementation

[0021] Reference Figures 1-4 A carbon fiber bicycle freewheel includes a ratchet assembly 1, which forms the main frame of the freewheel and connects to the bicycle hub. It provides mounting support for other components such as the chainring 2 and a heat sink 4. The inner wall of the ratchet assembly is a ratchet mechanism, a current technology in existing bicycle freewheels. The chainring 2 is fixedly mounted on the outer side of the ratchet assembly 1. The outer side of the chainring 2 can be driven by the chain, receiving power from the chain and transmitting it to the ratchet assembly 1, thereby driving the bicycle wheel to rotate. A heat sink 4 is fixedly connected to the front of the ratchet assembly 1 to improve its heat dissipation efficiency. Multiple sets of positioning blocks 5 are uniformly fixedly connected to the outer surface of the ratchet component 1. A slot 6 is provided at the rear of each positioning block 5. The positioning block 5 engages with a slot 8 on the inner wall of the crankset 2 to achieve initial positioning of the ratchet component 1 and the crankset 2. Simultaneously, the rear slot 6 is used for sliding connection with a rotating ring 7, providing a track for the rotating ring 7. The rotating ring 7 is rotatably connected to the inner wall of the crankset 2 and slidably connected to the inner wall of the slot 6. The rotating ring 7 is made of lightweight steel with high strength. By rotating the rotating ring 7 to the inner wall of the slot 6, the crankset 2 is... Axial locking is achieved by providing a groove 9 on the inner side of the rotating ring 7 that matches the shape of the positioning block 5. Since the groove 9 and the positioning block 5 have the same cross-sectional shape, and the slot 6 aligns with the groove 9, the locking of the positioning block 5 is released. A pull rod 11, which slides on the inner wall of the crankcase 2, is fixedly connected to the rear side of the rotating ring 7. The pull rod 11 slides in a metering groove on the rear side of the crankcase 2. The length by which the pull rod 11 moves within the groove allows the slot 6 to align with the groove 9. After releasing the locking of the rotating ring 7, pulling the pull rod 11 releases the restriction on the positioning block 5, and the crankcase... The inner wall of the chainring 2 has a slot 8 for accommodating the positioning block 5. The positioning block 5 is inserted into the slot 8. The rotating ring 7 is fixedly installed on the inner wall of the chainring 2 by a fastening bolt 10. The fastening bolt 10 is threaded on the rear side of the inner wall of the chainring 2, which firmly fixes the rotating ring 7 to the inner wall of the chainring 2, thereby making the ratchet part 1 tightly connected to the chainring 2. When disassembling, only the fastening bolt 10 needs to be loosened to separate the chainring 2 from the ratchet part 1. Compared with the disassembly method of replacing the entire freewheel using working tools, it saves maintenance time and facilitates the individual replacement of worn parts.

[0022] In this embodiment, during use, the positioning block 5 of the ratchet 1 is first inserted into the slot 8 of the gear 2 for positioning. Then, the rotating ring 7 is slid along the slot 6 by the pull rod 11 on the rear side of the rotating ring 7, so that the positioning block 5 of the rotating ring 7 is engaged. Finally, the rotating ring 7 is fixed to the inner wall of the gear 2 by the fastening bolt 10 to complete the connection.

[0023] During disassembly, loosen the fastening bolt 10 and pull the pull rod 11. Since the pull rod 11 slides in the groove on the back side of the chainring 2, it is used to assist in adjusting the position of the rotating ring 7, ensuring that the groove 9 is aligned with the slot 6 on the positioning block 5. Release the locking of the rotating ring 7 to the positioning block 5, and the chainring 2 and ratchet 1 can be separated. This design avoids the cumbersome steps of traditional flywheel disassembly and allows for the replacement of worn chainrings or ratchet components separately, shortening maintenance time and reducing maintenance costs.

[0024] As a preferred method, the head of the fastening bolt 10 is fixedly connected to a sleeve 12, and a rubber component 3 is fixedly connected to the inner wall of the toothed disc 2. The rubber component 3 is inserted into the inner wall of the sleeve 12. The snap-fit ​​between the rubber component 3 and the inner wall of the sleeve 12 can enhance the anti-loosening effect of the fastening bolt 10.

[0025] As a preferred method, the outer side of the rubber part 3 is provided with an annular protrusion, and the inner wall of the sleeve 12 is provided with an arc groove. The annular protrusion of the rubber part 3 and the arc groove of the sleeve 12 are engaged and matched. The engagement and matching can further enhance the anti-loosening effect of the fastening bolt 10, while absorbing some vibration energy and reducing the noise of the flywheel during operation.

[0026] As a preferred embodiment, the heat sink 4 includes a heat sink ring a41, which is fixedly connected to the front side of the ratchet component 1. The inner wall of the heat sink ring a41 has multiple sets of heat sink holes a42 radially opened. The heat sink holes a42 are inclined, and when the air flows through them during riding, a turbulence effect is generated, which increases the heat exchange between the air and the inside of the flywheel and improves the heat dissipation efficiency.

[0027] As a preferred embodiment, a heat dissipation ring b43 is fixedly connected to the front side of the ratchet component 1 near the inner side of the heat dissipation ring a41. Multiple sets of heat dissipation holes b44 are radially opened on the inner wall of the heat dissipation ring b43. The heat dissipation holes b44 are opened at an angle, forming a convection heat dissipation channel with the heat dissipation holes a42, further enhancing the heat dissipation effect and ensuring that the flywheel will not be affected by overheating when running at high speed.

[0028] As a preferred approach, the tilt direction of heat dissipation hole b44 is opposite to that of heat dissipation hole a42.

[0029] As a preferred embodiment, the ratchet 1, the chainring 2, and the heat sink 4 are made of carbon fiber, with a carbon fiber density of only 1.7–1.9 g / cm³. 3 It weighs about 1 / 4 of steel and 1 / 2 of aluminum alloy, which can significantly reduce the overall weight of the flywheel.

Claims

1. A bicycle flywheel made of carbon fiber, comprising a ratchet component (1), characterized in that: A toothed disc (2) is fixedly installed on the outside of the ratchet component (1). A heat sink (4) is fixedly connected to the front side of the ratchet component (1). Multiple sets of positioning blocks (5) are evenly fixedly connected to the outer surface of the ratchet component (1). A slot (6) is opened at the rear of the positioning block (5). A rotating ring (7) is rotatably connected to the inner wall of the toothed disc (2). The rotating ring (7) is slidably connected to the inner wall of the slot (6). A groove (9) matching the shape of the positioning block (5) is opened on the inner side of the rotating ring (7). A pull rod (11) sliding on the inner wall of the toothed disc (2) is fixedly connected to the rear side of the rotating ring (7). A slot (8) is opened on the inner wall of the toothed disc (2). The positioning block (5) is inserted into the slot (8). The rotating ring (7) is fixedly installed on the inner wall of the toothed disc (2) by a fastening bolt (10). The fastening bolt (10) is threadedly connected to the inner wall of the toothed disc (2).

2. A bicycle flywheel made of carbon fiber according to claim 1, characterized in that: The head of the fastening bolt (10) is fixedly connected to a sleeve (12), and a rubber part (3) is fixedly connected to the inner wall of the toothed disc (2). The rubber part (3) is inserted into the inner wall of the sleeve (12).

3. A bicycle flywheel made of carbon fiber according to claim 2, characterized in that: The rubber part (3) has an annular protrusion on its outer side, and the sleeve (12) has an arc groove on its inner wall. The annular protrusion of the rubber part (3) and the arc groove of the sleeve (12) are engaged and matched.

4. A bicycle flywheel made of carbon fiber according to claim 1, characterized in that: The heat sink (4) includes a heat sink ring a (41), which is fixedly connected to the front side of the ratchet (1). The inner wall of the heat sink ring a (41) has multiple sets of heat sink holes a (42) radially opened, and the heat sink holes a (42) are inclined.

5. A bicycle flywheel made of carbon fiber according to claim 4, characterized in that: The ratchet component (1) is fixedly connected to a heat dissipation ring b (43) near the inner side of the heat dissipation ring a (41). The inner wall of the heat dissipation ring b (43) has multiple sets of heat dissipation holes b (44) radially opened, and the heat dissipation holes b (44) are opened at an angle.

6. A bicycle flywheel made of carbon fiber according to claim 5, characterized in that: The tilt direction of the heat dissipation hole b (44) is opposite to that of the heat dissipation hole a (42).

7. A bicycle flywheel made of carbon fiber according to claim 5, characterized in that: The ratchet (1), gear plate (2) and heat sink (4) are made of carbon fiber.

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