Circuit board mounting structure

Abstract

The utility model relates to power motor technical field, especially a circuit board mounting structure, including shell, fixed base, drive motor and circuit board, the shell is provided with the accommodation cavity, drive motor and fixed base are arranged in the accommodation cavity from inside to outside in proper order, the outer periphery of fixed base is provided with rotary connecting element, and is installed in the accommodation cavity through rotary connecting element, one side of fixed base towards drive motor is provided with extension platform, installation support is provided on extension platform, circuit board sets up on installation support, and circuit board is located between fixed base and drive motor, the utility model discloses guarantee the high performance output of wheel hub motor at the same time, realized the high reliability built -in integration of circuit system, especially suitable for the wheel hub motor of strict requirement to space layout, environmental tolerance and durability.

Description

Technical Field

[0001] This utility model relates to the field of power motor technology, and in particular to a circuit board mounting structure. Background Technology

[0002] With the development of electric vehicles, electric bicycles, and various intelligent mobile platforms, hub motors have been widely used due to their compact structure and high transmission efficiency. However, the limited internal space of hub motors makes it crucial to integrate the motor drive circuit, control circuit, and other electronic components reliably and reasonably within the motor itself a key challenge for improving overall performance and reliability. In traditional designs, circuit boards are typically mounted externally to the motor or on the end cover, connected to the internal motor unit via wires. This layout not only occupies extra space, increasing the overall size and weight of the structure, but is also susceptible to external vibrations, humidity, dust, and other environmental factors, leading to problems such as loose connectors, aging wiring, and even short circuits, thus affecting the long-term stability of the motor.

[0003] Furthermore, the long connecting cables between the externally mounted circuit board and the motor body not only increase line impedance and transmission loss but may also introduce electromagnetic interference, reducing control accuracy and system response speed. Therefore, a novel circuit board mounting structure is urgently needed that can achieve stable installation, effective heat dissipation, and high-level sealing within a limited space, while also considering ease of assembly and maintenance, to meet the development needs of modern hub motors for high integration, high reliability, and lightweight design. Utility Model Content

[0004] To solve the above problems, this utility model achieves high-reliability built-in integration of the circuit system while ensuring the high-performance output of the hub motor. It is especially suitable for the circuit board mounting structure of hub motors with strict requirements for space layout, environmental tolerance and durability.

[0005] The technical solution adopted by this utility model is: a circuit board mounting structure, including a shell, a fixed base, a drive motor, and a circuit board. The shell is provided with a mounting cavity. The drive motor and the fixed base are arranged sequentially from the inside to the outside in the mounting cavity. The outer periphery of the fixed base is provided with a rotating connecting element, and the fixed base is mounted in the mounting cavity through the rotating connecting element. The side of the fixed base facing the drive motor is provided with an extension platform. The extension platform is provided with a mounting bracket. The circuit board is mounted on the mounting bracket and is located between the fixed base and the drive motor.

[0006] A further improvement to the above scheme is that the placement cavity is provided with an upper step and a lower step, and two rotating connecting elements are provided, which are respectively located on the upper step and the lower step.

[0007] A further improvement to the above solution is that a fixed connection end is provided on the fixed base, and a connecting base is provided on the drive motor, wherein the connecting base is fixedly connected to the fixed connection end.

[0008] A further improvement to the above solution is that a transmission cavity is provided inside the fixed base, a transmission component is provided inside the transmission cavity, the drive motor is provided with a drive spindle, and the drive spindle is drivenly connected to the transmission component.

[0009] A further improvement to the above solution is that a transmission gear ring is provided in the mounting cavity, the transmission gear ring is connected to the transmission assembly, and the drive motor drives the transmission assembly to rotate through the drive spindle, so that the outer shell rotates accordingly.

[0010] A further improvement to the above scheme is that the extension platform is provided with a heat dissipation contact platform, the heat dissipation contact platform extends toward the stator winding of the drive motor, and heat dissipation grease is provided between the stator winding and the heat dissipation contact platform for bonding.

[0011] A further improvement to the above solution is that an installation platform is provided on the outer periphery of the extension platform located on the heat dissipation contact platform, and the installation bracket is set on the installation platform.

[0012] A further improvement to the above solution is that the axial view shape of the heat dissipation contact platform is fan-shaped, and the circuit board is provided with a fan-shaped groove, which is used to fit on the heat dissipation contact platform.

[0013] A further improvement to the above solution is that the extension platform is provided with a threaded hole, the mounting bracket is provided with a through hole, and the circuit board is provided with a mounting hole, so that screws can be connected to the threaded hole by passing through the mounting hole and the through hole in sequence.

[0014] A further improvement to the above solution is that the mounting bracket is provided with a positioning pin, and the circuit board is provided with a positioning pin hole. The positioning pin cooperates with the positioning pin hole to fix the position of the circuit board.

[0015] The beneficial effects of this utility model are: Compared to existing hub motor circuit board mounting, this invention integrates the circuit board onto an extension platform between the fixed base and the drive motor, achieving a compact and stable arrangement of the electrical control unit within the hub motor. This effectively improves the system's integration, vibration resistance, and environmental adaptability. Specifically, the combined design of the extension platform and mounting bracket provides stable support for the circuit board within a limited space, fully utilizing the axial clearance between the fixed base and the drive motor, avoiding additional occupation of the hub's radial dimensions, and facilitating motor miniaturization and lightweight design. Placing the circuit board between the fixed base and the drive motor creates a relatively enclosed internal environment protected by the mechanical structure, effectively isolating it from external moisture, dust, and electromagnetic interference, thus improving the reliability of the circuit operation. Simultaneously, the close proximity of the circuit board to the drive motor shortens the connection distance of power and signal lines, reducing line impedance and transmission loss, suppressing high-frequency noise, and improving control response speed and energy efficiency. This invention achieves high-reliability integrated circuitry while ensuring high-performance output from the hub motor, making it particularly suitable for hub motors with stringent requirements for space layout, environmental tolerance, and durability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the circuit board mounting structure of this utility model; Figure 2 for Figure 1 Exploded view of the circuit board mounting structure; Figure 3 for Figure 1 Front view of the circuit board mounting structure; Figure 4 for Figure 3 Sectional view of AA.

[0017] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Resettling cavity; 111. Upper step; 112. Lower step; 113. Transmission gear ring; 2. Fixed base; 21. Rotary connecting element; 22. Extension platform; 221. Heat dissipation contact platform; 222. Mounting platform; 23. Mounting bracket; 231. Positioning pin; 24. Fixed connecting end; 25. Transmission cavity; 26. Transmission assembly; 3. Drive motor; 31. Connecting base; 32. Drive spindle; 4. Circuit board; 41. Sector groove; 42. Mounting hole; 43. Positioning pin hole. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Figures 1-4 As shown, in one embodiment of this utility model, a circuit board mounting structure is provided, including a housing 1, a fixed base 2, a drive motor 3, and a circuit board 4. The housing 1 is provided with a mounting cavity 11. The drive motor 3 and the fixed base 2 are sequentially arranged in the mounting cavity 11 from the inside to the outside. A rotating connecting element 21 is provided on the outer periphery of the fixed base 2, and the fixed base 2 is mounted in the mounting cavity 11 through the rotating connecting element 21. An extension platform 22 is provided on the side of the fixed base 2 facing the drive motor 3. A mounting bracket 23 is provided on the extension platform 22. The circuit board 4 is mounted on the mounting bracket 23 and is located between the fixed base 2 and the drive motor 3. This embodiment achieves a compact and stable arrangement of the electrical control unit inside the hub motor by integrating the circuit board 4 on the extension platform 22 between the fixed base 2 and the drive motor 3, effectively improving the system's integration, vibration resistance, and environmental adaptability. Specifically, the combined design of the extension platform 22 and the mounting bracket 23 allows the circuit board 4 to achieve stable support within a limited space, and makes full use of the axial clearance between the fixed base 2 and the drive motor 3, avoiding additional occupation of the hub's radial dimensions, which is beneficial for the miniaturization and lightweight design of the motor. Placing the circuit board 4 between the fixed base 2 and the drive motor 3, placing it in a relatively enclosed internal environment protected by the mechanical structure, effectively isolates it from external moisture, dust, and electromagnetic interference, improving the reliability of the circuit operation. At the same time, since the circuit board 4 is arranged close to the drive motor 3, the connection distance of the power lines and signal lines is shortened, which not only reduces line impedance and transmission loss, but also helps to suppress high-frequency noise and improve control response speed and energy efficiency. This embodiment achieves high-reliability built-in integration of the circuit system while ensuring the high-performance output of the hub motor, and is especially suitable for hub motors with stringent requirements for space layout, environmental tolerance, and durability.

[0021] The mounting cavity 11 is provided with an upper step 111 and a lower step 112. Two rotating connecting elements 21 are provided, one on the upper step 111 and the other on the lower step 112. In this embodiment, the mounting cavity 11 is further provided with an upper step 111 and a lower step 112, with the two rotating connecting elements 21 respectively positioned at the upper step 111 and the lower step 112. The double-step design, combined with the double rotating connecting elements 21, achieves a more balanced radial force distribution on the fixed base 2, enhancing the structural rigidity and stability of the entire transmission system during high-speed rotation. The upper and lower steps 112 form a layered axial positioning reference, enabling the fixed base 2 to be quickly aligned during assembly, effectively avoiding misalignment or assembly errors and improving installation accuracy. The double-step design disperses vibrations and impacts from the drive motor 3 and external loads, reducing the risk of stress concentration and helping to extend the service life of the motor under complex operating conditions. It also indirectly improves the vibration resistance and operational reliability of precision components such as the internal circuit board 4.

[0022] A fixed connection end 24 is provided on the fixed base 2, and the drive motor 3 is provided with a connecting base 31, which is fixedly connected to the fixed connection end 24. In this embodiment, during the operation of the hub motor, the relative displacement or micro-movement between the drive motor 3 and the fixed base 2 caused by electromagnetic force or mechanical vibration can be significantly suppressed, thereby avoiding abnormal noise, wear, and damage to the precision electronic components on the circuit board 4. The overall assembly process is simplified. This pre-assembled module can be conveniently installed into the mounting cavity 11 of the housing 1 as a whole by rotating the connecting element 21, which improves production efficiency and assembly accuracy, and facilitates subsequent maintenance and replacement.

[0023] A transmission cavity 25 is provided within the fixed base 2, and a transmission assembly 26 is provided within the transmission cavity 25. The drive motor 3 is provided with a drive spindle 32, which is drivenly connected to the transmission assembly 26. Specifically, a transmission gear ring 113 is provided within the mounting cavity 11, and the transmission gear ring 113 is connected to the transmission assembly 26. The drive motor 3 drives the transmission assembly 26 via the drive spindle 32, causing the transmission gear ring 113 to rotate, so that the outer shell 1 rotates accordingly. In this embodiment, by integrating a reduction transmission mechanism including the transmission assembly 26 and the transmission gear ring 113 inside the fixed base 2, a compact and efficient power transmission path is constructed. The power of the drive motor 3 is input to the transmission assembly 26 via the drive spindle 32, which in turn drives the transmission gear ring 113 connected to the outer shell 1, ultimately achieving the rotation output of the outer shell 1. By embedding and accommodating the reduction mechanism within the transmission cavity 25 of the fixed base 2 itself, the space utilization inside the hub motor is greatly optimized, and the power density is improved. Since the transmission path is completed entirely within the enclosed space formed by the fixed base 2 and the outer casing 1, it effectively isolates the transmission components from external environmental pollution and interference, thereby improving transmission efficiency and long-term operational reliability. The fixed base 2, as the main support structure of the transmission system, ensures the meshing accuracy between the gears of the transmission assembly 26, helps reduce noise and vibration, and creates favorable conditions for the stable operation of the internal circuit board 4.

[0024] The extension platform 22 is provided with a heat dissipation contact platform 221, which extends toward the stator winding 32 of the drive motor 3. Thermal grease is applied between the stator winding 32 and the heat dissipation contact platform 221. Specifically, an installation platform 222 is provided on the outer periphery of the heat dissipation contact platform 221, and the installation bracket 23 is mounted on the installation platform 222. In this embodiment, by providing a heat dissipation contact platform 221 extending from the fixed base 2 toward the stator winding 32 of the drive motor 3, and filling the space between them with thermal grease, an efficient heat conduction path is constructed from the core heat source (stator winding 32) inside the motor to the external fixed base 2. This allows the large amount of heat generated by the stator winding 32 during operation to be rapidly conducted to the fixed base 2, which has a large heat capacity and heat dissipation area, effectively reducing the temperature rise of the motor body and improving the motor's continuous power capability and thermal stability. By placing the mounting bracket 23 on the mounting platform 222 on the outer periphery of the heat dissipation contact platform 221, the structural installation and heat dissipation functions are integrated. This saves internal space, making the structure more compact. Furthermore, the rigid fixation of the mounting bracket 23 further strengthens the contact pressure between the heat dissipation contact platform 221 and the stator winding 32, ensuring the long-term stability and reliability of the heat dissipation interface.

[0025] The heat dissipation contact platform 221 has a fan-shaped axial view. The circuit board 4 is provided with a fan-shaped slot 41, which is used to fit onto the heat dissipation contact platform 221. In this embodiment, the fan-shaped fitting structure achieves dual circumferential and radial positioning of the circuit board 4 on the heat dissipation contact platform 221, effectively preventing the circuit board 4 from shifting or rotating during operation vibration, ensuring the accuracy and long-term stability of the installation position. The shape-matching fitting method greatly increases the physical contact area between the circuit board 4 and the heat dissipation contact platform 221, providing a better path for the heat generated by the circuit board 4 during operation to be conducted to the heat dissipation contact platform 221, thereby improving the efficiency of the entire heat dissipation system and helping to maintain the electronic components on the circuit board 4 at a suitable temperature, ensuring their performance and reliability. The ingenious fan-shaped design avoids the space waste that may be caused by traditional rectangular or circular structures, making the internal layout more compact and reasonable, especially suitable for applications where the internal space of the hub motor is limited.

[0026] The extension platform 22 has threaded holes, the mounting bracket 23 has through holes, and the circuit board 4 has mounting holes 42, allowing screws to be sequentially passed through the mounting holes 42, through holes, and threaded holes for connection. In this embodiment, by using the threaded holes on the extension platform 22, the through holes on the mounting bracket 23, and the mounting holes 42 on the circuit board 4, and by sequentially connecting these three with screws, the circuit board 4 and the mounting bracket 23 are fixed together as a single module on the extension platform 22, achieving integrated installation of multiple components and effectively improving assembly efficiency. The screw connection method provides a stable and adjustable locking force, which not only effectively resists the vibration and impact generated during the operation of the hub motor and prevents components from loosening, but also ensures uniform and tight contact pressure between the circuit board 4 and the lower heat dissipation contact platform 221.

[0027] The mounting bracket 23 is provided with a positioning pin 231, and the circuit board 4 is provided with a positioning pin hole 43. The positioning pin 231 cooperates with the positioning pin hole 43 to fix the position of the circuit board 4. In this embodiment, by providing a positioning pin 231 on the mounting bracket 23 and opening a positioning pin hole 43 on the circuit board 4 to precisely cooperate with it, the circuit board 4 is quickly and accurately pre-positioned during the installation process. Before finally fixing it with screws, the cooperation between the pin and the pin hole effectively restricts the degree of freedom of movement and rotation of the circuit board 4 in the plane, ensuring that the relative positions of the components, interfaces and other parts of the motor on the circuit board 4 are accurate, and avoiding electrical connection problems or mechanical interference caused by assembly misalignment.

[0028] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A circuit board mounting structure, characterized in that: The device includes a housing, a fixed base, a drive motor, and a circuit board. The housing has a mounting cavity, and the drive motor and the fixed base are arranged sequentially from the inside to the outside within the mounting cavity. The outer periphery of the fixed base is provided with a rotating connecting element, which is used to mount the device within the mounting cavity. The side of the fixed base facing the drive motor has an extension platform, and a mounting bracket is provided on the extension platform. The circuit board is mounted on the mounting bracket and is located between the fixed base and the drive motor.

2. The circuit board mounting structure according to claim 1, characterized in that: The placement cavity is provided with an upper step and a lower step, and two rotating connecting elements are provided, which are respectively located on the upper step and the lower step.

3. The circuit board mounting structure according to claim 1, characterized in that: The fixed base is provided with a fixed connection end, and the drive motor is provided with a connecting base, and the connecting base is fixedly connected to the fixed connection end.

4. The circuit board mounting structure according to claim 1, characterized in that: The fixed base is provided with a transmission cavity, the transmission cavity is provided with a transmission component, the drive motor is provided with a drive spindle, and the drive spindle is drivenly connected to the transmission component.

5. The circuit board mounting structure according to claim 4, characterized in that: A transmission gear ring is provided inside the mounting cavity. The transmission gear ring is connected to the transmission assembly. The drive motor drives the transmission assembly through the drive spindle to rotate the transmission gear ring, so that the outer shell rotates accordingly.

6. The circuit board mounting structure according to claim 1, characterized in that: The extension platform is provided with a heat dissipation abutment platform, which extends toward the stator winding of the drive motor, and heat dissipation grease is provided between the stator winding and the heat dissipation abutment platform for bonding.

7. The circuit board mounting structure according to claim 6, characterized in that: The extension platform is provided with an installation platform on the outer periphery of the heat dissipation contact platform, and the installation bracket is set on the installation platform.

8. The circuit board mounting structure according to claim 6, characterized in that: The heat dissipation contact platform has a fan-shaped axial view, and the circuit board is provided with a fan-shaped groove, which is used to fit on the heat dissipation contact platform.

9. The circuit board mounting structure according to claim 1, characterized in that: The extension platform is provided with threaded holes, the mounting bracket is provided with through holes, and the circuit board is provided with mounting holes, so that screws can be connected to the threaded holes by passing through the mounting holes and through holes in sequence.

10. The circuit board mounting structure according to claim 1, characterized in that: The mounting bracket is provided with a positioning pin, and the circuit board is provided with a positioning pin hole. The positioning pin and the positioning pin hole cooperate to fix the position of the circuit board.

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