Circuit board mounting structure of electric power-assisted bicycle control box

Abstract

The utility model provides a circuit board mounting structure of an electric power-assisted bicycle control box, the circuit board mounting structure is connected between a fluted disc and a crank and comprises an axial heat dissipation assembly and circuit assemblies arranged in parallel, and the heat dissipation assembly adopts a radial heat dissipation structure to form an airflow channel; the circuit assembly comprises a main heating area and a secondary heating area group, the main heating area directly faces the heat dissipation structure, heat exchange is conducted through airflow, when the bicycle runs, air makes direct contact with the heating area through an airflow channel, heat dissipation is accelerated, the fluted disc and the pedals move to drive the air to flow through the heat dissipation structure, and the heat dissipation efficiency is further improved. The design makes full use of natural airflow during driving, the forced heat dissipation requirement is reduced, the heat dissipation performance of the control box is improved, and the service life of elements is prolonged.

Description

Technical Field

[0001] This application relates to the field of control boxes, and more particularly to a circuit board mounting structure for an electric-assist bicycle control box. Background Technology

[0002] As an important component of modern transportation, the control box of an electric-assist bicycle plays a crucial role in regulating motor power, managing battery charge, and monitoring system operation. However, the circuit boards of traditional electric-assist bicycle control boxes are typically installed in a relatively enclosed space, causing electronic components to easily accumulate heat under high loads, affecting the device's performance and lifespan. Especially when the control box's heat dissipation performance is poor, electronic components such as power transistors and chip modules can age prematurely or even fail due to high temperatures, thus shortening the control box's lifespan. To address the heat dissipation problem of electric-assist bicycle control boxes, existing technologies have proposed various heat dissipation optimization schemes. Common solutions include installing heat sinks or adding ventilation holes on the aluminum shell of the control box, guiding heat dissipation through natural convection or forced airflow. In addition, some solutions use aluminum alloys, a metal with good thermal conductivity, to construct the aluminum shell, improving the efficiency of heat conduction from internal components to the outside. Other designs increase the surface area by increasing the volume of the control box or modifying the aluminum shell structure, thereby enhancing heat dissipation. These technical solutions alleviate the problem of heat accumulation inside the control box to some extent, but still fail to completely solve the problem of insufficient heat dissipation efficiency. While existing heat dissipation optimization technologies have improved the heat dissipation capabilities of e-bike control boxes to some extent, shortcomings remain. First, most of these solutions are limited to improvements in the aluminum casing, failing to fully utilize airflow or convection to improve the heat dissipation efficiency of components inside the circuit board. Second, existing technologies typically lack designs for zoned heat dissipation for different heat-generating areas on the circuit board, such as high-power and low-power components, resulting in uneven overall heat dissipation. Furthermore, the circuit board's mounting structure is complex, and space between components is limited, especially in compact e-bike designs where heat dissipation design is constrained by space limitations.

[0003] Therefore, it is necessary to provide a circuit board mounting structure for an electric-assist bicycle control box that can improve heat dissipation efficiency in component integration and heat dissipation path, in order to solve the problem of redundant components obstructing airflow circulation and causing uneven heat dissipation caused by component stacking in the circuit board mounting structure of the electric-assist bicycle control box in the prior art, as well as the problem of heat dissipation difficulties and excessive local heat in the control box caused by the circuit board and battery box being installed together in the traditional electric-assist bicycle control box. Utility Model Content

[0004] In view of this, it is necessary to provide a circuit board mounting structure for a power-assisted bicycle control box with optimized heat dissipation to solve the above problems.

[0005] Embodiments of this application provide a circuit board mounting structure for an electric-assist bicycle control box, connected between the chainring and the crank, including an axially arranged heat dissipation assembly and a circuit assembly arranged parallel to the heat dissipation assembly. The heat dissipation assembly includes:

[0006] The radial heat dissipation structure forms an airflow channel in the direction of bicycle travel;

[0007] Viewed along the axial direction, the circuit assembly includes a main heat-generating area positioned opposite the radial heat dissipation structure and a group of secondary heat-generating areas adjacent to the main heat-generating area. The main heat-generating area is capable of exchanging heat with the radial heat dissipation structure through air.

[0008] In at least one embodiment of this application, the radial heat dissipation structure includes a plurality of fins;

[0009] The bicycle travels in a first direction, and in the first direction, a plurality of the fins are arranged in a ring to form the airflow channel;

[0010] When the bicycle is moving, air flows along the length of the airflow channel.

[0011] In at least one embodiment of this application, the heat dissipation assembly includes an aluminum shell, and the circuit assembly includes a circuit board, wherein the aluminum shell and the circuit board are arranged side by side in an axial direction;

[0012] Viewed along the axis perpendicular to the circuit, the circuit board is connected between the toothed disc and the aluminum shell, and the aluminum shell is recessed in a direction away from the circuit board to form a convection cavity;

[0013] Viewed along the axial direction, the radial heat dissipation structure is disposed on the aluminum shell, the main heat-generating area and the secondary heat-generating area of ​​the circuit assembly are both located on the circuit board, the circuit board is provided with a heat dissipation hole group, and the heat dissipation hole group is directly opposite the convection cavity;

[0014] When the bicycle is moving, air convects along the height direction between the convection cavity and the circuit board.

[0015] In at least one embodiment of this application, the secondary heating area group includes a primary heating area. When viewed along the axial direction, the primary heating area is disposed adjacent to the primary heating area, and the circuit assembly includes a resistor module disposed on the primary heating area and a chip module disposed on the primary heating area.

[0016] Viewed along the axial direction, the heat dissipation hole group includes a first heat dissipation hole, which is located on the main heat-generating area and faces the convection cavity.

[0017] When the bicycle is moving, air flows along the first heat dissipation hole to the convection cavity to exchange heat.

[0018] In at least one embodiment of this application, the circuit assembly further includes a capacitor module disposed adjacent to the chip, and the secondary heat-generating area group further includes a secondary heat-generating area.

[0019] Viewed along the axial direction, the second heat-generating area is located at the end of the main heat-generating area away from the first heat-generating area, and a heat dissipation groove is provided in the second heat-generating area directly opposite the capacitor module. The capacitor module is disposed on the heat dissipation groove, and the heat dissipation groove is directly opposite the convection cavity.

[0020] When the bicycle is moving, air flows along the heat dissipation groove to the convection cavity to exchange heat.

[0021] In at least one embodiment of this application, in the height direction of the capacitor module, the aluminum shell is recessed in a direction away from the capacitor module to form a convection groove;

[0022] Viewed along the axial direction, the convection channel is positioned directly opposite the capacitor module;

[0023] When the bicycle is moving, air flows along the heat dissipation slots into the convection slots, so that the air forms natural convection in the height direction of the capacitor module, and then heat exchange occurs.

[0024] In at least one embodiment of this application, in the first direction, the surface formed by two adjacently arranged fins and the outer peripheral surface of the aluminum shell is a heat dissipation curved surface, and air flows on the multiple heat dissipation curved surfaces to form the heat dissipation channel.

[0025] In at least one embodiment of this application, the circuit assembly further includes a power supply module disposed between the chip module and the capacitor module, and the secondary heat-generating area group further includes a tertiary heat-generating area;

[0026] Viewed along the axial direction, the power module is located on the third heat-generating area, and the heat dissipation hole group includes a third heat dissipation hole arranged adjacent to the power module, the third heat dissipation hole being directly opposite the convection groove;

[0027] When the bicycle is moving, air flows along the third heat dissipation hole to the convection groove to exchange heat.

[0028] In at least one embodiment of this application, the heat dissipation hole group includes a second heat dissipation hole;

[0029] Viewed along the axial direction, the second heat dissipation hole is located on the second area to be heated and is adjacent to the heat dissipation groove, and the second heat dissipation hole is directly opposite the convection groove;

[0030] When the bicycle is moving, air flows along the second heat dissipation hole to the convection groove to exchange heat.

[0031] In at least one embodiment of this application, the power module is electrically connected to the capacitor module, the chip module, and the resistor module, and the power module includes an integrated copper tube, a copper tube base, and an electrical socket.

[0032] Viewed along the axial direction, the copper tube is embedded in the copper tube base, and the copper tube base is embedded in the electrical socket;

[0033] Viewed along the axis perpendicular to the stated axis, the copper tube portion extends out of the copper tube base, and the copper tube passes through the circuit board along the stated axis and is soldered onto the circuit board.

[0034] The circuit board mounting structure of the electric-assist bicycle control box described above optimizes heat dissipation performance by designing the control box's circuit board mounting structure as a radial heat dissipation structure arranged side-by-side with the circuit components and utilizing the resulting airflow channels. This design specifically leverages the unique position of the control box, located between the chainring and crank, to fully utilize the bicycle's riding state to improve the heat dissipation environment. First, the main heat-generating areas in the circuit components are positioned directly opposite the radial heat dissipation structure, allowing air to directly exchange heat with these areas through the airflow channels during bicycle operation, thus accelerating heat dissipation. Because the control box is located on the outside of the bicycle, close to the drivetrain, airflow is more free, especially during high-speed riding or pedal rotation. The movement of the pedals and chainring drives external airflow through the heat dissipation structure, further promoting air circulation and improving heat dissipation efficiency. Simultaneously, the heat-generating areas on the circuit board are rationally divided into primary and secondary heat-generating areas. The primary heat-generating areas focus on dissipating heat from higher-power components, while the secondary heat-generating areas handle the heat dissipation from relatively low-power components. This partitioned design ensures uniform and efficient heat dissipation. The airflow channel design, combined with the guidance of natural wind, ensures effective heat dissipation by optimizing natural airflow without the need for additional cooling equipment. This solution not only optimizes the heat exchange process but also fully utilizes the dynamic airflow generated during bicycle riding, thereby effectively improving heat dissipation efficiency, extending the lifespan of the control box and electronic components, and enhancing the overall stability and reliability of the device. In summary, this solution further enhances the heat dissipation effect brought about by airflow by integrating the layout of circuit components and heat dissipation structures with the bicycle's motion state, especially by utilizing natural airflow during riding, reducing reliance on forced cooling methods, and comprehensively improving the heat dissipation performance of e-bikes. Attached Figure Description

[0035] Figure 1 An axial disassembled view of the circuit board mounting structure of a power-assisted bicycle control box;

[0036] Figure 2 Front view of the aluminum casing;

[0037] Figure 3 This is a disassembled view of the aluminum casing;

[0038] Figure 4 This is a top view of the circuit components;

[0039] Figure 5 This is a top view of the circuit board;

[0040] Figure 6 This is a bottom view of the circuit board;

[0041] Figure 7 This is an exploded view of the power module along its axis.

[0042] Figure 8 This is a top view of the aluminum shell;

[0043] Figure 9 AA is a cross-sectional view of the top view of the aluminum shell.

[0044] Explanation of main component symbols

[0045] 3. Heat dissipation component; 4. Circuit component; 5. Radial heat dissipation structure; 6. Airflow channel; 7. Main heat-generating area; 8. Secondary heat-generating area group; 9. First heat-generating area; 10. Second heat-generating area; 11. Fin; 12. Aluminum shell; 13. Circuit board; 14. Heat dissipation hole group; 16. Resistor module; 17. Chip module; 18. First heat dissipation hole; 19. Capacitor module; 20. Heat dissipation groove; 21. Convection groove; 22. Heat dissipation curved surface; 23. Second heat dissipation hole; 24. Power supply module; 25. Third heat-generating area; 26. Third heat dissipation hole; 27. Copper pipe; 28. Copper pipe base; 29. ​​Electrical plug; 30. Convection cavity; 100. A circuit board mounting structure for a power-assisted bicycle control box. Detailed Implementation

[0046] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0047] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0048] Embodiments of this application provide a circuit board mounting structure for an electric-assist bicycle control box, connected between the chainring and the crank, including an axially arranged heat dissipation assembly and a circuit assembly arranged parallel to the heat dissipation assembly. The heat dissipation assembly includes:

[0049] The radial heat dissipation structure forms an airflow channel in the direction of bicycle travel;

[0050] Viewed along the axial direction, the circuit assembly includes a main heat-generating area positioned opposite the radial heat dissipation structure and a group of secondary heat-generating areas adjacent to the main heat-generating area. The main heat-generating area is capable of exchanging heat with the radial heat dissipation structure through air.

[0051] The circuit board mounting structure of the electric-assist bicycle control box described above optimizes heat dissipation performance by designing the control box's circuit board mounting structure as a radial heat dissipation structure arranged side-by-side with the circuit components and utilizing the resulting airflow channels. This design specifically leverages the unique position of the control box, located between the chainring and crank, to fully utilize the bicycle's riding state to improve the heat dissipation environment. First, the main heat-generating areas in the circuit components are positioned directly opposite the radial heat dissipation structure, allowing air to directly exchange heat with these areas through the airflow channels during bicycle operation, thus accelerating heat dissipation. Because the control box is located on the outside of the bicycle, close to the drivetrain, airflow is more free, especially during high-speed riding or pedal rotation. The movement of the pedals and chainring drives external airflow through the heat dissipation structure, further promoting air circulation and improving heat dissipation efficiency. Simultaneously, the heat-generating areas on the circuit board are rationally divided into primary and secondary heat-generating areas. The primary heat-generating areas focus on dissipating heat from higher-power components, while the secondary heat-generating areas handle the heat dissipation from relatively low-power components. This partitioned design ensures uniform and efficient heat dissipation. The airflow channel design, combined with the guidance of natural wind, ensures effective heat dissipation by optimizing natural airflow without the need for additional cooling equipment. This solution not only optimizes the heat exchange process but also fully utilizes the dynamic airflow generated during bicycle riding, thereby effectively improving heat dissipation efficiency, extending the lifespan of the control box and electronic components, and enhancing the overall stability and reliability of the device. In summary, this solution further enhances the heat dissipation effect brought about by airflow by integrating the layout of circuit components and heat dissipation structures with the bicycle's motion state, especially by utilizing natural airflow during riding, reducing reliance on forced cooling methods, and comprehensively improving the heat dissipation performance of e-bikes.

[0052] The following is in conjunction with the appendix Figure 1 - Figure 9 The following describes some embodiments of this application in detail. Unless otherwise specified, the embodiments and features described below can be combined with each other.

[0053] Embodiments of this application provide a circuit board mounting structure 100 for an electric-assisted bicycle control box, connected between a chainring (not shown) and a crank (not shown), including an axially arranged heat dissipation assembly 3 and a circuit assembly 4 arranged parallel to the heat dissipation assembly 3. The heat dissipation assembly 3 includes:

[0054] The radial heat dissipation structure 5 has an airflow channel 6 in the direction of bicycle travel;

[0055] Viewed along the axial direction, the circuit assembly 4 includes a main heat-generating area 7 positioned opposite the radial heat dissipation structure 5 and a secondary heat-generating area group 8 positioned adjacent to the main heat-generating area 7. The main heat-generating area 7 is capable of exchanging heat with the radial heat dissipation structure 5 through air.

[0056] Specifically, by arranging the heat dissipation component 3 and the circuit component 4 side-by-side in a radial heat dissipation structure 5, an effective airflow channel 6 is formed, optimizing heat dissipation performance. Especially in the context of electric-assist bicycle applications, the control box is typically installed in the space between the chainring and the crank. This unique position allows the design to fully utilize the airflow during bicycle operation, further improving heat dissipation efficiency. First, the main heat-generating area 7 of the circuit component 4 is strategically positioned directly opposite the radial heat dissipation structure 5. This allows air to smoothly exchange heat with the heat-generating area through the airflow channel 6 during bicycle operation, effectively accelerating heat dissipation. This design not only improves heat dissipation efficiency but also reduces the operating temperature of the circuit component, ensuring stable operation under high load conditions. Since the control box is installed outside the bicycle, close to a specific location on the drivetrain, especially during high-speed riding, the movement of the pedals and chainring pushes external air through the heat dissipation structure, creating natural airflow and enhancing the heat dissipation effect. To better manage heat dissipation, the heat-generating areas on the circuit board 13 are divided into a main heat-generating area 7 and a secondary heat-generating area group 8. The primary heat-generating zone 7 handles high-power components, such as the power supply module 24 and high-power resistors; while the secondary heat-generating zone handles relatively low-power components, such as the capacitor module 19 and the chip module 17. This zoned design ensures uniform heat dissipation, allowing heat from different heat sources to be efficiently dissipated, preventing malfunctions caused by localized overheating. Furthermore, the airflow channel 6, designed to guide natural wind, further enhances heat dissipation by optimizing natural airflow, even without additional cooling equipment. This solution not only optimizes the heat exchange process but also fully utilizes the dynamic airflow generated during bicycle movement, effectively improving heat dissipation efficiency, thereby extending the lifespan of the control box and its electronic components, and enhancing the overall stability and reliability of the equipment.

[0057] Furthermore, the radial heat dissipation structure 5 includes a plurality of fins 11;

[0058] The bicycle travels in a first direction, and in the first direction, a plurality of the fins 11 are arranged in a ring to form the airflow channel 6;

[0059] When the bicycle is moving, air flows along the length of the airflow channel 6.

[0060] Specifically, multiple fins 11 are added to enhance heat dissipation. These fins 11 are arranged in a ring along the direction of travel, forming an airflow channel 6, which further promotes airflow. The arrangement of the fins 11 not only increases the heat dissipation surface area but also effectively guides the airflow, allowing it to carry away heat more quickly. This design is particularly suitable for high-speed environments, where air flows along the airflow channel 6 as the bicycle moves forward at high speed, thereby enhancing heat dissipation efficiency. By strategically placing the fins 11 near key heat-generating areas, a more effective airflow circulation can be formed around the heat source, allowing the temperature of the main heat-generating area 7 to drop to a safe range more quickly. This enhanced heat dissipation capability significantly improves the reliability of electric-assist bicycles, preventing performance degradation and potential malfunctions caused by heat buildup.

[0061] Furthermore, the heat dissipation assembly 3 includes an aluminum shell 12, and the circuit assembly 4 includes a circuit board 13. Along the axial direction, the aluminum shell 12 and the circuit board 13 are arranged side-by-side.

[0062] Viewed along the axis perpendicular to the axis, the circuit board 13 is connected between the gear disk and the aluminum shell 12, and the aluminum shell 12 is recessed in the direction away from the circuit board 13 to form a convection cavity 30;

[0063] Viewed along the axial direction, the radial heat dissipation structure 5 is disposed on the aluminum shell 12, the main heat-generating area 7 and the secondary heat-generating area group 8 of the circuit assembly 4 are both located on the circuit board 13, the circuit board 13 is provided with a heat dissipation hole group 14, and the heat dissipation hole group 14 is directly opposite the convection cavity 30.

[0064] When the bicycle is moving, air convects along the height direction between the convection cavity 30 and the circuit board 13.

[0065] Specifically, the aluminum casing 12 and the circuit board 13 are arranged side-by-side, forming a more compact and efficient heat dissipation system. The aluminum casing 12 of the heat dissipation assembly 3 not only provides necessary protection for the circuit board 13, but also provides structural support for the arrangement of the heat dissipation hole group 14 and the convection cavity 30. The connection design between the circuit board 13 and the aluminum casing 12 allows airflow to effectively flow through the heat dissipation hole group 14 to the convection cavity 30 and form thermal convection, enhancing the connectivity of the heat dissipation path and further improving the heat exchange efficiency.

[0066] Furthermore, the secondary heating zone group 8 includes a primary heating zone 9. When viewed along the axial direction, the primary heating zone 9 is arranged adjacent to the primary heating zone 7, and the circuit assembly includes a resistor module 16 disposed on the primary heating zone 7 and a chip module 17 disposed on the primary heating zone.

[0067] Viewed along the axial direction, the heat dissipation hole group 14 includes a first heat dissipation hole 18, which is disposed on the main heat-generating area 7 and faces the convection cavity 15.

[0068] When the bicycle is moving, air flows along the first heat dissipation hole 18 to the convection cavity 30 to exchange heat.

[0069] Specifically, the secondary heat-generating area group 8 is further subdivided into the primary heat-generating area 9, and its adjacency with the primary heat-generating area 7 is emphasized. This layout design makes heat dissipation more efficient. By placing circuit components such as the resistor module 16 and the chip module 17 in the primary heat-generating area 7 and the primary heat-generating area 9 respectively, corresponding heat dissipation measures can be taken for different heat-generating components. The close proximity design of the primary heat-generating area 7 and the primary heat-generating area 9 allows for smoother airflow, enabling timely removal of heat generated by the heat-generating components and reducing the negative impact of heat on the circuit board 13. This ensures that the circuit components can operate stably under different operating conditions and avoids circuit component failure due to excessive temperature.

[0070] Furthermore, the circuit assembly also includes a capacitor module 19 disposed adjacent to the chip, and the secondary heat-generating area group 8 also includes a secondary heat-generating area 10;

[0071] Viewed along the axial direction, the second heating area 10 is located at the end of the main heating area 7 away from the first heating area 9, and the second heating area 10 is provided with a heat dissipation groove 20 facing the capacitor module 19. The capacitor module 19 is disposed on the heat dissipation groove 20, and the heat dissipation groove 20 is facing the convection cavity 30.

[0072] When the bicycle is moving, air flows along the heat dissipation groove 20 to the convection cavity 30 to exchange heat.

[0073] Specifically, a capacitor module 19 was added to the circuit components, and the location of the secondary heat-generating area 10 was clearly defined. This layout optimizes the heat dissipation channel and heat exchange efficiency. A heat dissipation slot 20 is provided directly opposite the capacitor module 19 in the secondary heat-generating area 10. This design enhances airflow, allowing it to effectively dissipate the heat generated by the capacitor module 19. The reasonable distance between the capacitor module 19 and other components of the circuit allows the air to cool down rapidly as it passes through the heat dissipation slot 20, thus preventing overheating from affecting the electric-assist bicycle control system. The advantage of this heat dissipation design is that the heat dissipation capacity of the capacitor module 19 is significantly improved, ensuring stability under high-load operating conditions.

[0074] Furthermore, in the height direction of the capacitor module 19, the aluminum shell 12 is recessed in a direction away from the capacitor module 19 to form a convection groove 21;

[0075] Viewed along the axial direction, the convection channel 21 is positioned directly opposite the capacitor module 19;

[0076] When the bicycle is moving, air flows along the heat dissipation groove 20 into the convection groove 21 so that the air forms natural convection in the height direction of the capacitor module 19, and then heat exchange occurs.

[0077] Specifically, in this design, the recess in the height direction of the capacitor module 19 forms a convection channel 21, positioned directly opposite the capacitor module 19. This structure optimizes airflow. Specifically, when the bicycle is in motion, external air passes through the control box and enters the convection channel 21. As the air heats up, the increased temperature causes it to rise due to its decreased density, creating natural convection. This natural convection occurs because the rising hot air draws cooler surrounding air into the convection channel 21, creating a circulating flow. In this way, the air around the capacitor module 19 is continuously replaced, ensuring effective heat dissipation. The advantage of natural convection lies in its passivity and self-regulation. Under different riding conditions and environmental conditions, airflow and temperature changes automatically affect the intensity of convection without the need for additional mechanical equipment. This design is particularly suitable for electric-assist bicycles because, during actual riding, the effect of natural convection can continuously function under different speeds and weather conditions, ensuring that the temperature of the circuit components remains within a safe range.

[0078] Furthermore, in the first direction, the surface formed by two adjacent fins 11 and the outer peripheral surface of the aluminum shell 12 is a heat dissipation curved surface 22, and air flows on the multiple heat dissipation curved surfaces 22 to form the heat dissipation channel.

[0079] Specifically, the formation of the heat dissipation surface 22 is emphasized. The heat dissipation surface 22, formed by two adjacent fins 11 and the outer peripheral surface of the aluminum shell 12, allows air to circulate over it. This design effectively increases the airflow area and improves airflow efficiency, thereby promoting heat dissipation. When the electric-assisted bicycle is traveling at high speed, the airflow over the heat dissipation surface 22 can quickly remove excess heat, preventing performance degradation of electronic components due to overheating.

[0080] Furthermore, the circuit assembly 4 also includes a power module 24 disposed between the chip module 17 and the capacitor module 19, and the secondary heat-generating area group 8 also includes a tertiary heat-generating area 25.

[0081] Viewed along the axial direction, the power module 24 is located on the third heat-generating area 25, and the heat dissipation hole group 14 includes a third heat dissipation hole 26 disposed adjacent to the power module 24, the third heat dissipation hole 26 being directly opposite the convection cavity 30;

[0082] When the bicycle is moving, air exchanges heat with the convection cavity 30 along the third heat dissipation hole 26.

[0083] Specifically, a power module 24 was added to circuit component 4, and its heat dissipation design was optimized. The newly added third heat-generating area 25 is adjacent to the power module 24. The core of this layout design is to ensure that heat can be quickly dissipated through reasonable heat dissipation hole placement, preventing overheating from affecting the performance of the entire system. The power module 24 plays an important energy management role in the electric-assist bicycle, so its enhanced heat dissipation capacity is directly related to the reliability and performance of the entire vehicle. The placement of the third heat dissipation hole 26 not only effectively reduces the operating temperature of the power module 24, but also provides a more stable operating environment for the entire control system.

[0084] Furthermore, the heat dissipation hole group 14 includes a second heat dissipation hole 23;

[0085] Viewed along the axial direction, the second heat dissipation hole 23 is disposed on the second heat-generating area 10 and is adjacent to the heat dissipation groove 20, and the second heat dissipation hole 23 is directly opposite the convection cavity 30;

[0086] When the bicycle is moving, air flows along the second heat dissipation hole 23 to the convection cavity 30 to exchange heat.

[0087] Specifically, a second heat dissipation hole 23 is introduced into the heat dissipation hole group 14. This design adds an extra heat dissipation channel to the heat dissipation system, further improving heat exchange efficiency. The second heat dissipation hole 23 is located on the secondary heat-generating area 10 and is adjacent to the heat dissipation slot 20. This layout ensures rapid heat dissipation while enhancing the overall heat dissipation capacity. By setting heat dissipation holes near the heat-generating components, the generated heat can be carried away more effectively, reducing the temperature inside the control box and thus avoiding performance degradation due to excessive temperature.

[0088] Furthermore, the power module 24 is electrically connected to the capacitor module 19, the chip module 17, and the resistor module 16. The power module 24 includes an integrated copper tube 27, a copper tube base 28, and an electrical socket.

[0089] Viewed along the axial direction, the copper tube 27 is embedded in the copper tube base 28, and the copper tube base 28 is embedded in the electrical socket;

[0090] Viewed along the axis perpendicular to the stated axis, the electric copper tube 27 extends out of the copper tube base 28, and the flashlight tube passes through the circuit board 13 along the stated axis and is soldered to the circuit board 13.

[0091] Specifically, the copper tube 27 is embedded within the copper tube base 28, which is embedded within the electrical socket. This integrated design not only simplifies the structure of the power module 24 and reduces assembly complexity but also improves system reliability, reduces contact issues between components, and enhances system heat dissipation through the heat dissipation function of the copper base, extending its service life. The combination of the copper tube 27 and the copper tube base 28 provides a good mechanical connection structure, ensuring stable fixation between the copper tube 27 and the copper tube base 28, preventing loosening under vibration or external force, thereby ensuring the long-term stability of the circuit operation. Viewed along the axial direction perpendicular to the power supply, the copper tube 27 extends beyond the copper tube base 28 and penetrates the circuit board 13 axially, whereby it is soldered to the circuit board 13. This extension of the copper tube 27 beyond the copper tube base 28 and penetration of the circuit board 13 facilitates direct electrical connection between the power module and the circuit board 13. Furthermore, the soldering process ensures a stable connection between the copper tube 27 and the circuit board 13. The circuits on the circuit board 13 are connected to ensure the stability of power transmission. This design allows the copper tube 27 to be tightly connected to the circuit board 13, which not only ensures efficient current transmission between the power module and the circuit board 13, but also effectively conducts the heat generated by the power module to the outside of the circuit board 13 through the thermal conductivity of the copper tube, which helps to improve heat dissipation efficiency. The design of the copper tube 27 penetrating the circuit board 13 can reduce additional wire connections, simplify the layout of the circuit board 13, and improve the overall heat dissipation effect of the circuit board 13, avoiding overheating that could affect the lifespan of electronic components.

[0092] The aforementioned mounting structure of the circuit board 13 in the electric-assist bicycle control box optimizes heat dissipation performance by designing the radial heat dissipation structure 5 and the circuit assembly 4 side-by-side, utilizing the airflow channel 6 formed by them. This design specifically leverages the unique position of the control box, located between the chainring and crank, to improve the heat dissipation environment during bicycle operation. First, the main heat-generating area 7 in the circuit assembly 4 is positioned directly opposite the radial heat dissipation structure 5, allowing air to directly exchange heat with the heat-generating area through the airflow channel 6 during bicycle operation, thus accelerating heat dissipation. Since the control box is located on the outside of the bicycle near the drivetrain, airflow is more free, especially during high-speed cycling or pedal rotation. The movement of the pedals and chainring drives external airflow through the heat dissipation structure, further promoting air circulation and improving heat dissipation efficiency. Simultaneously, the heat-generating areas on the circuit board 13 are rationally divided into a main heat-generating area 7 and a secondary heat-generating area group 8. The main heat-generating area focuses on dissipating heat from high-power components, while the secondary heat-generating area handles heat dissipation from relatively low-power components. This partitioned design ensures uniform and efficient heat dissipation. The airflow channel 6, combined with the guidance of natural wind, ensures effective heat dissipation by optimizing natural airflow without the need for additional cooling equipment. This solution not only optimizes the heat exchange process but also fully utilizes the dynamic airflow generated during bicycle movement, thereby effectively improving heat dissipation efficiency, extending the lifespan of the control box and electronic components, and enhancing the overall stability and reliability of the device. In summary, this solution further enhances the heat dissipation effect brought about by airflow by combining the layout of the circuit components 4 and the heat dissipation structure with the bicycle's movement state, especially by utilizing natural airflow during riding, reducing reliance on forced cooling methods, and comprehensively improving the heat dissipation performance of electric-assist bicycles.

[0093] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A circuit board mounting structure for a control box of an electric-assisted bicycle, connected between a chainring and a crank, comprising an axially arranged heat dissipation assembly and a circuit assembly arranged parallel to the heat dissipation assembly, characterized in that, The heat dissipation component includes: The radial heat dissipation structure forms an airflow channel in the direction of bicycle travel; Viewed along the axial direction, the circuit assembly includes a main heat-generating area positioned opposite the radial heat dissipation structure and a group of secondary heat-generating areas adjacent to the main heat-generating area. The main heat-generating area is capable of exchanging heat with the radial heat dissipation structure through air.

2. The circuit board mounting structure of the electric-assist bicycle control box according to claim 1, characterized in that, The radial heat dissipation structure includes multiple fins; The bicycle travels in a first direction, and in the first direction, a plurality of the fins are arranged in a ring to form the airflow channel; When the bicycle is moving, air flows along the length of the airflow channel.

3. The circuit board mounting structure of the electric-assist bicycle control box according to claim 2, characterized in that, The heat dissipation component includes an aluminum shell, and the circuit component includes a circuit board. The aluminum shell and the circuit board are arranged side by side along the axial direction. Viewed along the axis perpendicular to the circuit, the circuit board is connected between the toothed disc and the aluminum shell, and the aluminum shell is recessed in a direction away from the circuit board to form a convection cavity; Viewed along the axial direction, the radial heat dissipation structure is disposed on the aluminum shell, the main heat-generating area and the secondary heat-generating area of ​​the circuit assembly are both located on the circuit board, the circuit board is provided with a heat dissipation hole group, and the heat dissipation hole group is directly opposite the convection cavity; When the bicycle is moving, air convects along the height direction between the convection cavity and the circuit board.

4. The circuit board mounting structure of the electric-assist bicycle control box according to claim 3, characterized in that, The secondary heating area group includes a primary heating area. When viewed along the axial direction, the primary heating area is arranged adjacent to the primary heating area, and the circuit assembly includes a resistor module disposed on the primary heating area and a chip module disposed on the primary heating area. Viewed along the axial direction, the heat dissipation hole group includes a first heat dissipation hole, which is located on the main heat-generating area and faces the convection cavity. When the bicycle is moving, air flows along the first heat dissipation hole to the convection cavity to exchange heat.

5. The circuit board mounting structure of the electric-assist bicycle control box according to claim 4, characterized in that, The circuit assembly also includes a capacitor module disposed adjacent to the chip, and the secondary heat-generating area group also includes a secondary heat-generating area; Viewed along the axial direction, the second heat-generating area is located at the end of the main heat-generating area away from the first heat-generating area, and a heat dissipation groove is provided in the second heat-generating area directly opposite the capacitor module. The capacitor module is disposed on the heat dissipation groove, and the heat dissipation groove is directly opposite the convection cavity. When the bicycle is moving, air flows along the heat dissipation groove to the convection cavity to exchange heat.

6. The circuit board mounting structure of the electric-assist bicycle control box according to claim 5, characterized in that, In the height direction of the capacitor module, the aluminum shell is recessed in a direction away from the capacitor module to form a convection groove; Viewed along the axial direction, the convection channel is positioned directly opposite the capacitor module; When the bicycle is moving, air flows along the heat dissipation slots into the convection slots, so that the air forms natural convection in the height direction of the capacitor module, and then heat exchange occurs.

7. The circuit board mounting structure of the electric-assist bicycle control box according to claim 3, characterized in that, In the first direction, the surface formed by two adjacent fins and the outer peripheral surface of the aluminum shell is a heat dissipation curved surface, and air flows on multiple heat dissipation curved surfaces to form the airflow channel.

8. The circuit board mounting structure of the electric-assist bicycle control box according to claim 6, characterized in that, The circuit assembly also includes a power module disposed between the chip module and the capacitor module, and the secondary heat-generating area group also includes a tertiary heat-generating area; Viewed along the axial direction, the power module is located on the third heat-generating area, and the heat dissipation hole group includes a third heat dissipation hole arranged adjacent to the power module, the third heat dissipation hole being directly opposite the convection groove; When the bicycle is moving, air flows along the third heat dissipation hole to the convection groove to exchange heat.

9. The circuit board mounting structure of the electric-assist bicycle control box according to claim 8, characterized in that, The heat dissipation hole group includes a second heat dissipation hole; Viewed along the axial direction, the second heat dissipation hole is located on the second area to be heated and is adjacent to the heat dissipation groove, and the second heat dissipation hole is directly opposite the convection groove; When the bicycle is moving, air flows along the second heat dissipation hole to the convection groove to exchange heat.

10. The circuit board mounting structure of the electric-assist bicycle control box according to claim 8, characterized in that, The power module is electrically connected to the capacitor module, chip module and resistor module. The power module includes an integrated copper tube, a copper tube base and an electrical socket. Viewed along the axial direction, the copper tube is embedded in the copper tube base, and the copper tube base is embedded in the electrical socket; Viewed along the axis perpendicular to the stated axis, the copper tube portion extends out of the copper tube base, and the copper tube passes through the circuit board along the stated axis and is soldered onto the circuit board.

Images