A wheel hub motor

Abstract

The application discloses a wheel hub motor and relates to the technical field of motors, which comprises a mounting seat, a stator connected with the mounting seat, and a rotor rotatably sleeved outside the stator, wherein the rotor is a semi-closed structure, the rotor and the mounting seat are in clearance fit at one end of the rotor, and a drainage flow channel extending in a radial direction is formed between the rotor and the mounting seat. In actual use, especially when driving on a wet or water-accumulating road, water entering the wheel hub can be discharged along the drainage flow channel, thereby avoiding the problem of water accumulation in the wheel hub motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a hub motor. Background Technology

[0002] A hub motor, also known as an electric wheel, is a type of motor that integrates power, transmission, and braking systems within the wheel hub. It's a drive system that combines the motor, reducer, and brake into a single unit. Its working principle is as follows: the motor's rotor is directly connected to the wheel hub, while the stator is installed inside the hub. When the motor is powered on, the magnetic field generated by the stator interacts with the magnetic field of the rotor, producing torque that drives the wheel hub to rotate, thus propelling the vehicle forward.

[0003] Chinese patent document CN208479361U discloses an external rotor hub motor with an external electromagnetic brake. The motor consists of a stator, an external rotor, a shaft, and an electromagnetic brake. The stator and electromagnetic brake are mounted on the shaft, and the external rotor is fitted over the stator. A tire is also fitted over the outside of the external rotor. In practical use, the external rotor is driven to rotate by energizing the coils on the stator. The electromagnetic brake works in conjunction with brake pads connected to the external rotor to brake it.

[0004] However, some problems arise when the above solution is applied to unmanned floor cleaning and sweeping equipment. As an intelligent floor cleaning device integrating washing, drying, dust removal, and stain removal, the unmanned floor cleaning robot operates in an environment with extensive water spraying. Although the stator and outer rotor are sealed in the above solution, the sealing effect gradually decreases over time, leading to incomplete sealing. This allows water to easily accumulate between the magnets and coils inside the outer rotor. Prolonged water accumulation can easily cause corrosion, thus affecting the lifespan of the equipment. Summary of the Invention

[0005] In view of this, the present invention provides a hub motor to solve the problem that when hub motors in the prior art are used in water-related equipment, the seal between the stator and rotor cannot completely prevent water from entering the hub motor, leading to water accumulation inside the hub motor.

[0006] In a first aspect, the present invention provides a hub motor, comprising:

[0007] Mounting base;

[0008] The stator is connected to the mounting base;

[0009] The rotor is rotatably mounted on the outside of the stator. The rotor has a semi-enclosed structure. The rotor and the mounting base are fitted with a clearance at one end of the rotor. At least a portion of the rotor and the mounting base form a drainage channel extending in the radial direction.

[0010] The technical solution of this invention has the following advantages:

[0011] In actual use, especially when driving on wet or flooded roads, water that enters the wheel hub can be discharged through the drainage channel, thus avoiding the problem of water accumulation inside the wheel hub motor.

[0012] Optionally, the drainage channel has a first section extending in a radial direction and a second section extending in an axial direction, the outlet of the second section facing towards the side close to the mounting base, a sealing ring is provided on the mounting base at the outlet of the second section, the sealing ring is spaced from the outlet of the second section, a labyrinth channel is formed between the sealing ring and the rotor, and the outlet of the labyrinth channel faces away from the mounting base.

[0013] The above-mentioned design creates a multi-layered waterproof defense. When external moisture attempts to enter the hub motor, the sealing rings effectively prevent large amounts of water from entering. The sealing ring design reduces the direct impact of moisture on components such as the mounting base and rotor. Without this design, prolonged operation in a humid environment could lead to material detachment and damage to the mounting base and rotor surfaces, affecting the motor's structural stability. This design effectively reduces such intrusion, extends component lifespan, and improves the overall reliability of the motor.

[0014] Optionally, the labyrinthine flow channel includes a third segment extending radially and a fourth segment extending axially. This configuration further increases the difficulty for moisture to enter the motor.

[0015] Optionally, the mounting base has a mounting sleeve extending in the axial direction, on which the stator is mounted. This arrangement allows for a more compact internal layout of the hub motor. The axially extending mounting sleeve provides a stable mounting base for the stator, effectively utilizing the axial space inside the hub motor.

[0016] Optionally, the mounting base has a central hole in which a central shaft is rotatably mounted. One end of the central shaft is fixedly connected to the rotor, and the other end is connected to a braking device. Under normal conditions, the braking device maintains a brake on the central shaft; upon energization, the braking device releases the brake. By mounting the central shaft within the central hole of the mounting base, the central hole provides stable support for the central shaft, limiting its radial and axial displacement during rotation. The other end of the central shaft is connected to the braking device, achieving a compact integration of motor drive and braking functions on the same shaft system. This integrated design reduces the space occupied by the vehicle chassis and simplifies the connection structure between the vehicle's braking and drive systems. Compared to the traditional approach of separating the braking device and motor, this design makes the overall vehicle structure more compact, which is beneficial for lightweight vehicle design and space optimization.

[0017] Furthermore, the braking system is directly connected to the central shaft, enabling rapid and effective braking. Specifically, the braking system employs a power-off braking mechanism. Once the vehicle stops, the braking force is immediately transferred to the central shaft, ensuring it remains stationary and preventing the wheels from rotating unnecessarily. This direct connection significantly shortens the response time during braking, effectively improving braking efficiency and providing a strong guarantee for safe vehicle stopping.

[0018] Optionally, the braking device includes an electromagnetic brake body and a bushing. The electromagnetic brake body is connected to the mounting base, and the bushing is connected to the central shaft. The electromagnetic brake body has a brake disc and a pressure disc. The brake disc is circumferentially limited in fit with the bushing, and the pressure disc is used to axially press the brake disc. Specifically, the electromagnetic brake body can be connected to the mounting base via fasteners, and the bushing can be fixedly connected to the central shaft via a tight fit. This layout makes full use of the internal space structure of the hub motor. The mounting base serves as the basic support component of the hub motor, and the electromagnetic brake body is connected to it without occupying excessive additional space, allowing the entire braking device to be tightly integrated with the motor structure. Simultaneously, the bushing is directly connected to the central shaft, avoiding a complex transmission mechanism and further optimizing the spatial layout, making the overall structure of the hub motor more compact.

[0019] When the electromagnetic brake loses power, the pressure plate in the electromagnetic brake body presses the brake disc under the action of the spring. The brake disc transmits the braking force to the central shaft through the bushing, thereby performing a braking operation on the central shaft and ultimately limiting the rotation of the rotor.

[0020] When the electromagnetic brake body is energized, it quickly generates electromagnetic force to overcome the elastic force and release the clamping force on the brake disc. The brake disc, along with the bushing, can then rotate with the rotation of the central shaft. Because the electromagnetic brake body is directly connected to the mounting base, which provides a stable support structure, the electromagnetic force can be transmitted quickly and efficiently.

[0021] Optionally, an encoder is also connected to the mounting base. The encoder is located on the side of the braking device closer to the rotor, and the encoder's code disk is connected to the central shaft. Because the encoder is installed on the side of the braking device closer to the rotor, it can acquire the position information of the central shaft and the rotor connected to it in real time and accurately. For example, during motor start-up, stopping, and operation, the encoder can accurately record the angle rotated by the rotor and feed this position data back to the motor control system.

[0022] With the above settings, real-time speed monitoring can be achieved. By detecting the number of pulses on the code disk per unit time, the encoder can calculate the rotational speed of the central shaft, which is the rotor's rotational speed, in real time. This speed information is extremely crucial for the speed control of the motor.

[0023] Optionally, the mounting base has a cylindrical boss extending toward the end away from the rotor on the side away from the rotor. The circumferential arc surface of the cylindrical boss is used to fit the sealing ring. The circumferential arc surface of the cylindrical boss provides a convenient positioning and fitting surface for the installation of the sealing ring. During installation, the sealing ring is simply fitted along the arc surface.

[0024] Optionally, the cylindrical boss has a mounting platform extending towards the end away from the rotor. The mounting platform has a second mounting hole for connecting to the braking device, and a third mounting hole for connecting to other equipment. This arrangement allows the braking device to be directly mounted close to the motor rotor, shortening the power transmission path and improving braking response speed. Simultaneously, the connection to other equipment via the third mounting hole further expands the application range of the motor within the system, making the layout of the motor, braking device, and other equipment more compact and rational.

[0025] Optionally, the central shaft and the rotor are an integral structure, and the central shaft is rotatably connected to the mounting base on both sides of the mounting base through bearings.

[0026] In the above design, the central shaft and rotor are integrated into a single structure, eliminating the connecting links between the shaft and rotor and making the entire rotating component a unified whole. Compared to a separate structure that connects the shaft and rotor via keys, splines, or other methods, the integrated structure reduces the risk of malfunctions caused by loose connections or wear. During motor operation, the integrated structure can better withstand the torque and axial forces from the motor's internal electromagnetic forces and external loads, reducing the likelihood of localized stress concentration and thus significantly improving the overall structural strength and stability of the motor.

[0027] In the above design, the central shaft is rotatably connected to the mounting base on both sides via bearings. This double-sided support provides stable support for the central shaft, effectively reducing radial runout and axial movement during rotation. Stable rotation helps extend the service life of internal motor components, especially critical components such as the stator windings and bearings that are tightly fitted to the central shaft. Simultaneously, the integrated structure of the central shaft and rotor reduces wear caused by relative movement between components, further improving the long-term reliability of the motor.

[0028] Optionally, the rotor has a first annular flange circumferentially located on the side near the mounting base, and the mounting base has a second annular flange circumferentially located inside the first annular flange, forming the drainage channel between the second annular flange and the first annular flange. The drainage channel formed by the annular flange structure has a large circumferential drainage space, enabling rapid drainage of accumulated liquid. Under the influence of gravity and the centrifugal force generated during motor operation, the liquid flows circumferentially along the drainage channel and eventually finds a suitable drain outlet to exit the motor. This efficient drainage design ensures that even in the event of a large influx of liquid in a short period, the liquid can be drained promptly, maintaining a dry environment inside the motor and sustaining normal operation.

[0029] Optionally, a tire is fitted around the outer periphery of the rotor, and a first mounting hole for connecting fasteners is provided on the end face of the rotor away from the mounting base. The tire is fixedly connected to the rotor by the cooperation of the fasteners with the first mounting hole.

[0030] The tire is secured to the rotor by fasteners that fit into the first mounting holes on the rotor end face. This connection method simplifies tire installation. During installation, the operator simply places the tire onto the rotor, aligning the first mounting holes on the tire with those on the rotor end face, and then screws in the appropriate fasteners to secure the tire to the rotor. When the tire becomes worn or damaged and needs replacement, the old tire can be easily removed by unfastening the fasteners, and a new tire can be installed. This easy-to-replace design reduces downtime caused by tire damage, improving equipment efficiency. It also lowers maintenance costs, as only the tire needs to be replaced, without replacing the entire motor drive system. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 A front half-sectional view of a hub motor provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0034] Figure 3 for Figure 1 A three-dimensional view of the mounting base;

[0035] Figure 4 for Figure 1 A three-dimensional view of the central rotor;

[0036] Figure 5 for Figure 3 A second-angle perspective view of the mounting base;

[0037] Figure 6 for Figure 4 A two-dimensional view of the central rotor from the second angle.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Mounting base; 2. Stator; 3. Rotor; 4. Drainage channel; 5. First section; 6. Second section; 7. Third section; 8. Fourth section; 9. Sealing ring; 10. Mounting cylinder; 11. Central shaft; 12. Braking device; 13. Fourth mounting hole; 14. First bearing; 15. Second bearing; 16. First annular flange; 17. Second annular flange; 18. First mounting hole; 19. Tire; 20. Arc surface; 21. Cylindrical boss; 22. Mounting platform; 23. Second mounting hole; 24. Third mounting hole. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] like Figure 1As shown, this is a specific embodiment of the hub motor provided in this example, including: a mounting base 1, a stator 2, and a rotor 3. The stator 2 is connected to the mounting base 1, and the rotor 3 is rotatably sleeved on the outside of the stator 2. The rotor 3 has a semi-enclosed structure, and there is a clearance fit between the rotor 3 and the mounting base 1 at one end of the rotor 3. A drainage channel 4 extending radially in at least a portion is formed between the rotor 3 and the mounting base 1.

[0045] In other words, in this embodiment, the rotor 3 has a semi-enclosed structure. At one end of the rotor 3, it is fitted with the mounting base 1 with a clearance, and a drainage channel 4 is formed between the rotor 3 and the mounting base 1. At least a portion of the drainage channel 4 extends radially. With this arrangement, during actual use of the hub motor, especially when driving on wet or flooded roads, water entering the hub can be discharged along the drainage channel 4, thereby avoiding the problem of water accumulation inside the hub motor.

[0046] like Figure 2 As shown, in this embodiment, the drainage channel 4 has a first section 5 extending in the radial direction and a second section 6 extending in the axial direction. The outlet of the second section 6 faces the side close to the mounting base 1. A sealing ring 9 is provided on the mounting base 1 at the outlet of the second section 6. There is a gap between the sealing ring 9 and the outlet of the second section 6. A labyrinth channel is formed between the sealing ring 9 and the rotor 3. The outlet of the labyrinth channel faces the side away from the mounting base 1.

[0047] In other words, in this embodiment, the drainage channel 4 is composed of a first section 5 extending radially and a second section 6 extending axially. The outlet of the second section 6 faces the side closer to the mounting base 1, and a sealing ring 9 is provided on the mounting base 1 at the position corresponding to the outlet of the second section 6. There is a certain gap between this sealing ring 9 and the outlet of the second section 6, and a labyrinth channel is formed between the sealing ring 9 and the rotor 3, the outlet of which faces the side away from the mounting base 1.

[0048] The above-described design creates a multi-layered waterproof defense. When external moisture attempts to enter the hub motor, the sealing ring 9 effectively prevents the intrusion of large amounts of water. The design of the sealing ring 9 reduces the direct impact of moisture on components such as the mounting base 1 and rotor 3. Without this design, prolonged operation in a humid environment could lead to the detachment and damage of the surface materials of the mounting base 1 and rotor 3, affecting the structural stability of the motor. This design effectively reduces such intrusion, extends the service life of components, and improves the overall reliability of the motor.

[0049] Of course, the above description is not limiting. In some alternative embodiments, the drainage channel 4 may have only a first segment 5 extending in the radial direction; or it may have other segments, etc.

[0050] like Figure 2 As shown, in this embodiment, the labyrinth flow channel includes a third segment 7 extending radially and a fourth segment 8 extending axially. That is, in this embodiment, the labyrinth flow channel specifically includes a third segment 7 extending radially and a fourth segment 8 extending axially, with the outlet of the fourth segment 8 facing away from the mounting base 1. This design increases the difficulty of water being directly sprayed into the motor from the mounting base 1.

[0051] Of course, the above description is not limiting. In some alternative embodiments, the labyrinth channel may have a third segment 7 extending in the radial direction; or it may have other segments, etc.

[0052] like Figure 3 , Figure 4 As shown, in this embodiment, the mounting base 1 has a mounting cylinder 10 extending in the axial direction, and the stator 2 is mounted on the mounting cylinder 10. This arrangement makes the internal layout of the hub motor more compact. The axially extending mounting cylinder 10 provides a stable mounting base for the stator 2, effectively utilizing the axial space inside the hub motor.

[0053] Of course, the above description is not limiting. In some alternative embodiments, the mounting cylinder 10 may be omitted, and the stator 2 may be mounted on other structures of the mounting base 1.

[0054] like Figure 5 As shown, the mounting base 1 has a central hole, within which a central shaft 11 is rotatably mounted. One end of the central shaft 11 is fixedly connected to the rotor 3. Specifically, the central shaft 11 and the rotor 3 can be connected by a threaded connection, a snap-fit ​​connection, or an integral molding connection. By rotatably mounting the central shaft 11 within the central hole of the mounting base 1 and fixing one end of the central shaft 11 to the rotor 3, a stable rotational support point is provided for the rotor 3. The fit between the central shaft 11 and the central hole can constrain the radial and axial displacement of the rotor 3, ensuring that the rotor 3 maintains a stable axis of rotation during motor operation.

[0055] like Figure 1As shown, the other end of the central shaft 11 is connected to the brake device 12. By mounting the central shaft 11 in the central hole of the mounting base 1, the central hole provides stable support for the central shaft 11, limiting the radial and axial displacement of the central shaft 11 during rotation. The connection of the other end of the central shaft 11 to the brake device 12 achieves a compact integration of motor drive and braking functions on the same shaft system. This integrated design reduces the space occupied by the vehicle chassis and simplifies the connection structure between the vehicle braking system and the drive system. Compared with the traditional approach of separating the brake device 12 from the motor, this design makes the overall vehicle structure more compact, which is beneficial for lightweight vehicle design and space optimization.

[0056] Furthermore, the braking device 12 is directly connected to the central shaft 11, enabling rapid and effective braking. Specifically, the braking device 12 employs a power-off braking mechanism. When the vehicle stops, the braking device 12 immediately transmits braking force to the central shaft 11, ensuring that the central shaft 11 remains stationary, thereby preventing the wheels from rotating unnecessarily. This direct connection significantly shortens the response time during braking, effectively improves braking efficiency, and provides a strong guarantee for the safe stopping of the vehicle.

[0057] It should be noted that in this embodiment, the braking device 12 includes an electromagnetic brake body and a bushing. The electromagnetic brake body is connected to the mounting base 1, and the bushing is connected to the central shaft 11. The electromagnetic brake body has a brake disc and a pressure disc. The brake disc and the bushing are circumferentially limited, and the pressure disc is used to axially press the brake disc. Specifically, the electromagnetic brake body can be connected to the mounting base 1 via fasteners, the brake disc can be connected to the bushing via a spline structure, and the bushing and the central shaft 11 can be connected via a tight fit. This layout makes full use of the internal space structure of the hub motor. The mounting base 1 serves as the basic support component of the hub motor, and the electromagnetic brake body is connected to it without occupying too much additional space, allowing the entire braking device 12 to be tightly integrated with the motor structure. At the same time, the bushing is directly connected to the central shaft 11, avoiding a complex transmission mechanism, further optimizing the spatial layout, and making the overall structure of the hub motor more compact.

[0058] When the electromagnetic brake body loses power, the pressure plate in the electromagnetic brake body presses the brake disc under the action of the spring. The brake disc transmits the braking force to the central shaft 11 through the bushing, thereby performing a braking operation on the central shaft 11, and finally achieving the restriction of the rotation of the rotor 3.

[0059] When the electromagnetic brake body is energized, it quickly generates electromagnetic force to overcome the elastic force and release the clamping force on the brake disc. The brake disc, along with the bushing, can rotate with the rotation of the central shaft 11. Since the electromagnetic brake body is directly connected to the mounting base 1, the mounting base 1 provides a stable support structure for it, which allows the electromagnetic force to be transmitted quickly and efficiently.

[0060] like Figure 3 As shown, in this embodiment, an encoder is also connected to the mounting base 1. The encoder is located on the side of the braking device 12 closer to the rotor 3, and the encoder's code disk is connected to the central shaft 11. It should be noted that... Figure 3 The structure of the encoder is not shown. The encoder is a conventional product in the prior art and can be used in this embodiment.

[0061] Of course, the above description is not limiting. In some alternative embodiments, the encoder may be omitted and other methods may be used to monitor the rotational speed of the rotor 3.

[0062] like Figure 3 As shown, in this embodiment, the mounting base 1 has a fourth mounting hole 13 for mounting an encoder. The encoder can be mounted on the fourth mounting hole 13 by fasteners. The central shaft 11 on the rotor 3 passes through the encoder and is connected to its code disk.

[0063] Because the encoder is installed on the side of the brake device 12 close to the rotor 3, it can acquire the position information of the central shaft 11 and the rotor 3 connected to it in real time and accurately. For example, during motor start-up, stopping, and operation, the encoder can accurately record the angle rotated by the rotor 3 and feed this position data back to the motor control system.

[0064] With the above settings, real-time speed monitoring can be achieved. By detecting the number of pulses on the code disk per unit time, the encoder can calculate the rotational speed of the central shaft 11, which is the rotational speed of the rotor 3, in real time. This speed information is extremely critical for the speed control of the motor.

[0065] like Figure 4 As shown, in this embodiment, the central shaft 11 and the rotor 3 are an integral structure, and the central shaft 11 is rotatably connected to the mounting base 1 on both sides of the mounting base 1 through bearings.

[0066] In the above design, the central shaft 11 and rotor 3 are designed as a single unit, eliminating the connection between the shaft and rotor 3 and making the entire rotating component a whole. Compared to a separate structure that connects the shaft and rotor 3 via keys, splines, or other methods, the integrated structure reduces the risk of failure due to loose connections or wear. During motor operation, the integrated structure can better withstand the torque and axial force from the internal electromagnetic force of the motor and external loads, and is less prone to localized stress concentration, thus greatly improving the overall structural strength and stability of the motor.

[0067] In the above scheme, the central shaft 11 is rotatably connected to the mounting base 1 on both sides via bearings. Specifically, as shown... Figure 1 As shown, a first bearing 14 is fitted onto one side of the mounting base 1 on the central shaft 11, and a second bearing 15 is fitted onto the other side. The outer sides of the first bearing 14 and the second bearing 15 are tightly fitted to the inner wall of the mounting base 1. This double-sided support provides stable support for the central shaft 11, effectively reducing radial runout and axial movement during rotation. Stable rotation helps extend the service life of internal components of the motor, especially critical components such as the stator 2 windings and bearings that are tightly fitted with the central shaft 11. Simultaneously, the integrated structure of the central shaft 11 and rotor 3 reduces wear caused by relative movement between components, further improving the long-term reliability of the motor.

[0068] like Figure 5 , Figure 6 As shown, the rotor 3 has a first annular flange 16 circumferentially located near the mounting base 1, and the mounting base 1 has a second annular flange 17 circumferentially located inside the first annular flange 16. The drainage channel 4 is formed between the second annular flange 17 and the first annular flange 16. The drainage channel 4 formed by the annular flange structure has a large circumferential drainage space, enabling rapid drainage of accumulated liquid. Under the action of gravity and the centrifugal force generated during motor operation, the liquid flows circumferentially along the drainage channel 4 and eventually finds a suitable drain outlet to exit outside the motor. This efficient drainage design ensures that even if a large amount of liquid rushes in for a short time, it can be drained promptly, maintaining a dry environment inside the motor and ensuring normal operation.

[0069] like Figure 3 As shown, in this embodiment, the mounting base 1 has a cylindrical boss 21 extending towards the end away from the rotor 3 on the side away from the rotor 3. The cylindrical boss 21 forms an arc surface 20 around its circumference for fitting the sealing ring 9. The arc surface 20 around the cylindrical boss 21 provides a convenient positioning and fitting surface for the installation of the sealing ring 9. During installation, the sealing ring 9 can simply be fitted onto the arc surface 20.

[0070] In this embodiment, the mounting base 1 has an arc surface 20 for fitting the sealing ring 9. The arc surface 20 is located on one side of the second annular flange 17, thereby using the second annular flange 17 to position the sealing ring 9.

[0071] like Figure 3 As shown, in this embodiment, the cylindrical boss 21 has a mounting platform 22 extending towards the end away from the rotor 3. The mounting platform 22 has a second mounting hole 23 for connecting to the brake device 12, and a third mounting hole 24 for connecting to other equipment. This arrangement allows the brake device 12 to be directly mounted close to the motor rotor 3, shortening the power transmission path and improving braking response speed. Simultaneously, the connection to other equipment via the third mounting hole 24 further expands the application range of the motor in the entire system, making the layout of the motor, brake device 12, and other equipment more compact and rational.

[0072] like Figure 1 , Figure 6 As shown, in this embodiment, a tire 19 is fitted around the outer periphery of the rotor 3, and a first mounting hole 18 for connecting fasteners is provided on the end face of the rotor 3 away from the mounting base 1. The tire 19 is fixedly connected to the rotor 3 by the cooperation of the fasteners with the first mounting hole 18.

[0073] The tire 19 is fixed to the rotor 3 by fasteners engaging with the first mounting hole 18 on the end face of the rotor 3. This connection method simplifies the installation process of the tire 19. During installation, the operator simply places the tire 19 onto the rotor 3, aligning the first mounting hole 18 on the tire 19 with the first mounting hole 18 on the end face of the rotor 3. Then, the corresponding fasteners are screwed into the first mounting holes 18 to secure the tire 19 to the rotor 3. When the tire 19 becomes worn or damaged and needs to be replaced, the old tire 19 can be easily removed by disassembling the fasteners, and a new tire 19 can be installed. This easy-to-replace design reduces downtime caused by tire 19 damage, improving equipment efficiency. It also reduces maintenance costs, as only the tire 19 needs to be replaced, without replacing the entire motor drive system.

[0074] Of course, the above description is not limiting. In some alternative embodiments, the tire 19 may be connected to the rotor 3 using other structures, such as an annular groove on the outer periphery of the rotor 3 for engaging the tire 19.

[0075] Working principle:

[0076] In this embodiment of the hub motor, during assembly, the stator 2 is installed on the mounting sleeve 10 of the mounting base 1 to ensure a secure fixation. After installing the first bearing 14 on the central shaft 11, the central shaft 11 is passed through the central hole of the mounting base 1 to fix the central shaft 11 to the rotor 3 (this connection step is not required if it is an integral structure). Then, the second bearing 15 is installed on the central shaft 11. The first bearing 14 and the second bearing 15 are respectively tightly fitted to the inner wall of the mounting base 1.

[0077] An encoder is installed inside the mounting base 1. The sealing ring 9 is fitted onto the second flange of the mounting base 1, and then the brake device 12 is installed on the mounting base 1. Finally, the tire 19 is fitted onto the outer periphery of the rotor 3, and the tire 19 is fastened to the end face of the rotor 3 using fasteners.

[0078] At this point, the hub motor assembly is complete.

[0079] When replacing tire 19, simply remove the fasteners on the end face of the shaft, replace tire 19, and then fasten the new tire 19 onto the rotor 3 with the fasteners.

[0080] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A hub motor, characterized in that, include: Mounting base (1); The stator (2) is connected to the mounting base (1); The rotor (3) is rotatably mounted on the outside of the stator (2). The rotor (3) is a semi-enclosed structure. The rotor (3) and the mounting base (1) are in clearance fit at one end of the rotor (3). At least a portion of the rotor (3) and the mounting base (1) form a drainage channel (4) extending radially. The drainage channel (4) has a first section (5) extending radially and a second section (6) extending axially. The outlet of the second section (6) faces the side close to the mounting base (1). A sealing ring (9) is provided on the mounting base (1) at the outlet of the second section (6). There is a gap between the sealing ring (9) and the outlet of the second section (6). A labyrinth channel is formed between the sealing ring (9) and the rotor (3). The outlet of the labyrinth channel faces the side away from the mounting base (1). The labyrinth channel includes a third section (7) extending radially and a fourth section (8) extending axially. The rotor (3) has a first annular flange (16) on the side near the mounting base (1) and a second annular flange (17) on the side of the mounting base (1). The second annular flange (17) is located inside the first annular flange (16) and the drainage channel (4) is formed between the second annular flange (17) and the first annular flange (16).

2. The hub motor according to claim 1, characterized in that, The mounting base (1) has a mounting cylinder (10) extending in the axial direction, and the stator (2) is mounted on the mounting cylinder (10).

3. The hub motor according to claim 1, characterized in that, The mounting base (1) has a central hole, in which a central shaft (11) is rotatably disposed. One end of the central shaft (11) is fixedly connected to the rotor (3), and the other end of the central shaft (11) is connected to a brake device (12). The brake device (12) maintains the brake on the central shaft (11) under normal conditions. When energized, the brake device (12) releases the brake on the central shaft (11).

4. The hub motor according to claim 3, characterized in that, The braking device (12) includes: an electromagnetic brake body and a bushing. The electromagnetic brake body is connected to the mounting base (1), and the bushing is connected to the central shaft (11). The electromagnetic brake body has a brake disc and a pressure disc. The brake disc is circumferentially limited to the bushing, and the pressure disc is used to axially press the brake disc.

5. The hub motor according to claim 4, characterized in that, An encoder is also connected to the mounting base (1). The encoder is located on the side of the braking device (12) near the rotor (3). The encoder's code disk is connected to the central shaft (11).

6. The hub motor according to claim 3, characterized in that, The mounting base (1) has a cylindrical boss (21) extending toward the end away from the rotor (3) on the side away from the rotor (3), and the cylindrical boss (21) forms an arc surface (20) around its circumference for fitting a sealing ring (9). The cylindrical boss (21) has a mounting platform (22) extending toward one end away from the rotor (3), the mounting platform (22) has a second mounting hole (23) for connecting to the brake device (12), and the mounting platform (22) also has a third mounting hole (24) for connecting to the equipment.

7. The hub motor according to any one of claims 3-6, characterized in that, The central shaft (11) and the rotor (3) are an integral structure. The central shaft (11) is rotatably connected to the mounting base (1) on both sides of the mounting base (1) through bearings.

8. The hub motor according to any one of claims 1-6, characterized in that, The rotor (3) is fitted with a tire (19) on its outer periphery. The end face of the rotor (3) away from the mounting base (1) is provided with a first mounting hole (18) for connecting fasteners. The tire (19) is fixedly connected to the rotor (3) by the cooperation of the fasteners with the first mounting hole (18).

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