Wheel hub motor and wheeled device

Abstract

This invention relates to a hub motor and a wheeled device, comprising a support shaft, a housing, a stator assembly, a composite magnetic ring, and a planetary assembly. Because permanent magnets are mounted on the inner circumferential wall of the composite magnetic ring, it functions as a traditional rotor assembly. When the stator assembly is energized and generates a rotating magnetic field, it drives the composite magnetic ring to rotate around it. Simultaneously, because the outer circumferential wall of the composite magnetic ring forms an external gear ring that directly meshes with the planetary gears, it also functions as a traditional sun gear, driving the planetary gears to rotate along the internal gear ring via the external gear ring, ultimately achieving high torque output through the planetary carrier. In other words, the composite magnetic ring achieves a high degree of integration between the rotor assembly and the sun gear in terms of physical structure and function. Thus, the aforementioned hub motor, while ensuring high torque output, can significantly reduce the total number of parts, thereby simplifying the structure and improving integration.

Description

Technical Field

[0001] This invention relates to the field of drive motor technology, and in particular to a hub motor and wheeled device. Background Technology

[0002] Hub motors, with their compact structure and high transmission efficiency, are widely used in electric bicycles, electric motorcycles, and automated guided vehicles (AGVs). In practical applications, to meet the high torque output requirements during vehicle start-up and hill climbing, a common approach is to integrate a planetary reducer within the hub motor. However, planetary reducers mainly consist of a sun gear, planetary gears, and a planet carrier, resulting in a large number of components. This significantly increases the number of parts inside the hub motor, leading to a series of problems such as complex assembly processes and high overall structural redundancy. Moreover, when the hub motor outputs high torque under heavy load conditions, the internal structure of the planetary reducer will be subjected to large tangential and radial forces, causing significant yaw and vibration at the output end of the planetary reducer, thus affecting its long-term reliability. Summary of the Invention

[0003] Therefore, it is necessary to provide a hub motor and wheeled device that has a simpler structure, higher integration, and higher long-term reliability to address the above problems.

[0004] A hub motor, comprising: Support shaft; The outer casing is mounted on the support shaft, and an internal gear ring is formed on the inner wall of the outer casing. The stator assembly is housed in the housing and fixed to the support shaft; A composite magnetic ring, having a permanent magnet on its inner peripheral wall and an external toothed ring formed on its outer peripheral wall, is rotatably fitted onto the outer periphery of the stator assembly; and The planetary assembly includes a planet carrier and a plurality of planetary gears mounted on the planet carrier. The planetary gears are located between the composite magnetic ring and the inner wall of the housing and mesh with the internal gear ring and the external gear ring. The output end of the planet carrier rotatably passes through the housing. The output end of the planetary carrier is provided with a support sleeve. The support sleeve passes through a hole in the side wall of the outer shell and is rotatably fitted onto the support shaft. The outer wall of the support sleeve is rotatably fitted with the wall of the hole through a first bearing, and the inner wall of the support sleeve is rotatably fitted with the support shaft through a second bearing.

[0005] In one embodiment, the support shaft has a wire-passing groove inside, one end of which extends to the outside of the housing and the other end extends to the inside of the stator assembly.

[0006] In one embodiment, the internal gear ring is interference-fitted to the inner wall of the housing.

[0007] In one embodiment, the system further includes an inner motor housing, which is housed within the outer housing and rotatably mounted on the support shaft. The stator assembly is housed within the inner motor housing, and the composite magnetic ring is fixedly mounted on the outer periphery of the inner motor housing.

[0008] In one embodiment, the motor housing includes two inner side covers disposed opposite to each other. Both inner side covers are rotatably fitted onto the support shaft and are respectively fixedly connected to opposite sides of the composite magnetic ring. The stator assembly is located between the two inner side covers.

[0009] In one embodiment, a limiting member is also included, which is fixed to the support shaft and abuts against the planetary carrier.

[0010] In one embodiment, a first oil seal is provided between the outer wall of the support sleeve and the wall of the through hole, and a second oil seal is provided between the inner wall of the support sleeve and the support shaft.

[0011] In one embodiment, the first oil seal is disposed on the outside of the first bearing, and the second oil seal is disposed on the outside of the second bearing.

[0012] In one embodiment, a rim is also included, which is rotatably fitted onto the support shaft and drivenly connected to the planetary carrier.

[0013] In one embodiment, the rim and the planetary carrier are connected by a drive mechanism through a boss and a mating groove.

[0014] In one embodiment, the boss is disposed on the rim, and a plurality of the bosses are equally spaced along the circumference of the support shaft; the mating groove is disposed on the output end of the planetary carrier, and a plurality of the mating grooves are equally spaced along the circumference of the support shaft.

[0015] A wheeled device includes a hub motor as described in any of the preferred embodiments above, and the hub motor provides driving force.

[0016] The aforementioned hub motor and wheeled equipment, due to the permanent magnets mounted on the inner circumferential wall of the composite magnetic ring, can function as a traditional rotor assembly. When the stator assembly is energized and generates a rotating magnetic field, it drives the composite magnetic ring to rotate. Simultaneously, because the outer circumferential wall of the composite magnetic ring forms an external gear ring that directly meshes with the planetary gears, the composite magnetic ring can also function as a traditional sun gear. It can drive the planetary gears to rotate along the internal gear ring via the external gear ring, ultimately achieving high torque output through the planetary carrier. In other words, the composite magnetic ring achieves a high degree of integration between the rotor assembly and the sun gear in terms of physical structure and function. Thus, the aforementioned hub motor, while ensuring high torque output, can significantly reduce the total number of parts, thereby simplifying the structure and improving integration.

[0017] Furthermore, the cooperation between the support sleeve and the support shaft provides additional support points for the planetary carrier, resulting in a more balanced force distribution during torque output and effectively suppressing radial sway and axial misalignment. Moreover, the first and second bearings are located on opposite radial sides of the support sleeve, forming a double-sided rotary support structure. This allows the output end of the planetary carrier to receive support from both the outer casing sidewall and the support shaft, thus providing double-sided constraint on the support sleeve in the radial direction, making it less prone to radial sway or axial movement at the output end. Therefore, the long-term reliability of the aforementioned hub motor is significantly improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the hub motor in a preferred embodiment of the present invention; Figure 2 for Figure 1 The diagram shown is an exploded view of the hub motor. Figure 3 for Figure 1 The cross-sectional view of the hub motor shown; Figure 4 for Figure 1 The diagram shows the structure of the composite magnetic ring in the hub motor. Figure 5 for Figure 1 The diagram shows the structure of the planetary carrier in the hub motor. Figure 6 for Figure 1 The diagram shows the structure of the wheel rim in the hub motor.

[0020] Explanation of reference numerals in the attached figures: Hub motor - 100; Support shaft - 110; Cable groove - 111; Housing - 120; Internal gear ring - 121; Outer cover - 122; Half-shell - 123; Stator assembly - 130; Composite magnetic ring - 140; Permanent magnet - 141; External gear ring - 142; Planetary assembly - 150; Planetary carrier - 151; Support sleeve - 1511; Connecting groove - 1512; Planetary gear - 152; Motor inner housing - 160; Inner side cover - 161; Limiting component - 170; First bearing - 181; Second bearing - 182; First oil seal - 191; Second oil seal - 192; Wheel rim - 1100; Boss - 1110. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 this invention and 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 this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Please see Figure 1 The present invention provides a hub motor 100. Furthermore, the present invention also provides a wheeled device, wherein the wheeled device includes the hub motor 100.

[0028] The aforementioned wheeled equipment is driven by a hub motor 100 to achieve movement. The hub motor 100 has wide adaptability and can therefore be integrated as a drive element into various types of wheeled equipment. The specific form of the wheeled equipment can be flexibly configured according to the power level of the hub motor 100. For example, the wheeled equipment can be a two-wheeled vehicle such as an electric bicycle, electric motorcycle, or electric scooter; it can also be an automated guided vehicle (AGV) with multiple wheels; or it can be a new energy vehicle. For different application scenarios, the hub motor 100 can be adjusted by changing its electromagnetic parameters, reduction ratio, and other parameters to meet the requirements of traction, speed, and torque.

[0029] It is understood that, given the high adaptability of the aforementioned hub motor 100, it is not only applicable to the civilian and industrial vehicles listed above, but can also be extended to special equipment fields such as military robots and electric wheelchairs. Any technical solution that uses the aforementioned hub motor 100 as a drive source should be understood to fall within the protection scope of this invention.

[0030] Please refer to the following: Figure 2 and Figure 3 In a preferred embodiment of the present invention, the hub motor 100 includes a support shaft 110, a housing 120, a stator assembly 130, a composite magnetic ring 140, and a planetary assembly 150.

[0031] The support shaft 110, serving as a supporting component for the hub motor 100, is typically made of high-carbon steel, possessing high bending strength and good toughness. It maintains structural stability under complex load conditions and is not prone to bending deformation or breakage. The support shaft 110 remains stationary during the operation of the hub motor 100. In specific applications, both ends of the support shaft 110 can be fixedly connected to the frame or suspension system, such as mounting it on the front fork or rear swingarm of an electric two-wheeler, thus providing a stable mounting base for the entire hub motor 100.

[0032] The housing 120 is fixedly mounted on the support shaft 110, with both ends of the support shaft 110 extending beyond the housing 120 for connection and fixation to the external frame or suspension system. The support shaft 110 remains stationary during the operation of the hub motor 100, and the housing 120 remains fixed together with the support shaft 110, with no relative rotation between them. Specifically, the housing 120 and the support shaft 110 are fixedly connected via a keyway fit. A sealing ring (not shown in the figure) is generally also provided at the connection point between the support shaft 110 and the housing 120. The sealing ring is used to seal the contact area, preventing external moisture, dust, and other impurities from entering the housing 120, and also preventing leakage of internal lubricating media.

[0033] Specifically, in this embodiment, the outer shell 120 adopts a split structure, including a half-shell 123 and an outer cover 122. The half-shell 123 is a shell structure with one open end, and the outer cover 122 is placed on the open end of the half-shell 123. The two are generally locked together by threaded fasteners arranged at intervals along the circumference, thereby jointly assembling to form a complete outer shell 120. The above-mentioned split structure facilitates the installation and disassembly of its internal components, reducing the assembly difficulty.

[0034] Furthermore, an internal gear ring 121 is formed on the inner wall of the outer casing 120. The internal gear ring 121 extends continuously along the circumference of the outer casing 120, forming an overall annular structure, and its central axis preferably coincides with the central axis of the support shaft 110. The internal gear ring 121 is fixedly connected to the main body of the outer casing 120, and the two remain relatively stationary. During the operation of the hub motor 100, since the outer casing 120 is fixed on the support shaft 110 and remains stationary, the internal gear ring 121 also remains stationary.

[0035] Specifically, in this embodiment, the internal gear ring 121 is interference-fitted to the inner wall of the housing 120. The interference fit process is simple to operate, requiring no additional connecting structures on the housing 120, effectively maintaining the overall structural integrity of the housing 120, and avoiding adverse effects on the housing strength caused by operations such as creating threaded holes or keyways. Simultaneously, the interference fit generates a large contact clamping force between the internal gear ring 121 and the inner wall of the housing 120, forming a reliable axial positioning and resisting axial movement caused by vibration and impact loads during the operation of the hub motor 100.

[0036] It is understood that in other embodiments, the internal gear ring 121 may also be fixed to the inner wall of the housing 120 by welding. Alternatively, the internal gear ring 121 may also be integrally formed by machining teeth into the inner wall of the housing 120 to form the internal gear ring 121.

[0037] The stator assembly 130 is housed inside the housing 120 and fixedly mounted on the support shaft 110. During operation, the stator assembly 130 remains relatively fixed to the support shaft 110 and does not rotate with the composite magnetic ring 140. Specifically, the stator assembly 130 and the support shaft 110 can be fixedly connected by a keyway fit, an interference fit, or by locking with set screws to ensure that there is no relative rotation between them.

[0038] Specifically, the stator assembly 130 includes a stator core and stator windings wound on the stator core. The stator core is formed by stacking multiple silicon steel sheets along the axial direction of the support shaft 110. Its inner peripheral wall generally matches the outer peripheral wall of the support shaft 110, and the two are circumferentially fixedly connected by a keyway. This prevents the stator assembly 130 from rotating circumferentially relative to the support shaft 110, thus ensuring that the stator assembly 130 remains stationary during operation. The stator windings generate a magnetic field when energized. The stator windings are embedded in slots in the stator core and electrically connected to an external power source via wires (not shown). When the power is turned on, the stator windings generate a rotating magnetic field.

[0039] In this embodiment, a wire-passing groove 111 is provided inside the support shaft 110. One end of the wire-passing groove 111 extends to the outside of the housing 120, and the other end extends to the inside of the stator assembly 130.

[0040] The conductors of the stator assembly 130 are arranged through the wiring groove 111, and after being led out from the stator winding, they run along the wiring groove 111 and finally emerge from the end of the support shaft 110 to the outside, thereby achieving electrical connection with an external power supply or controller. In this way, the conductors of the stator assembly 130 run entirely inside the support shaft 110, and the conductors do not need to pass through the rotating parts between the stator assembly 130 and the housing 120. Therefore, there is no need to set up a dynamic sealing structure, effectively reducing the sealing difficulty.

[0041] Please refer to the following: Figure 4 The composite magnetic ring 140 has a permanent magnet 141 on its inner peripheral wall and an outer toothed ring 142 on its outer peripheral wall. Moreover, the composite magnetic ring 140 is rotatably fitted onto the outer periphery of the stator assembly 130.

[0042] The composite magnetic ring 140 has an overall annular structure and is rotatably fitted around the outer periphery of the stator assembly 130, preferably coaxially arranged with the stator assembly 130. The composite magnetic ring 140 is made of a material with good magnetic permeability, such as laminated silicon steel sheets or machined carbon steel, to ensure unobstructed magnetic circuitry and reduce eddy current losses. The permanent magnets 141 are preferably made of high-performance permanent magnet materials, such as neodymium iron boron magnets, and are spaced apart along the inner peripheral wall of the composite magnetic ring 140, arranged according to a predetermined number of pole pairs. The magnetic poles of adjacent permanent magnets 141 are opposite in direction, forming alternating N and S poles. A uniform air gap is maintained between the permanent magnets 141 and the outer peripheral wall of the stator assembly 130. When the stator assembly 130 is energized, it generates a rotating magnetic field. This rotating magnetic field interacts with the permanent magnets 141 to generate electromagnetic torque, thereby driving the composite magnetic ring 140 to rotate around the stator assembly 130. It is evident that the composite magnetic ring 140 can function as a traditional rotor assembly.

[0043] Please refer to it again. Figure 2 and Figure 3 Specifically, in this embodiment, the hub motor 100 also includes a motor inner housing 160, which is housed in the outer housing 120 and rotatably mounted on the support shaft 110. The stator assembly 130 is housed inside the motor inner housing 160, and the composite magnetic ring 140 is fixedly mounted on the outer periphery of the motor inner housing 160.

[0044] The motor inner housing 160 serves as the mounting base for the composite magnetic ring 140, providing load-bearing and support. The composite magnetic ring 140 can be fixed to the outer circumference of the motor inner housing 160 via interference fit, key connection, or threaded fasteners. When the composite magnetic ring 140 rotates under electromagnetic torque, the motor inner housing 160 rotates together with it. That is, the motor inner housing 160 and the composite magnetic ring 140 constitute an integral rotating assembly, rotating together relative to the stator assembly 130 and the support shaft 110. Simultaneously, the motor inner housing 160 also provides physical isolation for the stator assembly 130, ensuring a uniform and stable air gap between the stator assembly 130 and the composite magnetic ring 140, which helps improve the operational reliability of the hub motor 100.

[0045] Furthermore, in this embodiment, the motor inner housing 160 includes two inner side covers 161 arranged opposite to each other. Both inner side covers 161 are rotatably sleeved on the support shaft 110 and are fixedly connected to the opposite sides of the composite magnetic ring 140, respectively. The stator assembly 130 is located between the two inner side covers 161.

[0046] The two inner covers 161 are fixedly connected to the two axial ends of the composite magnetic ring 140, and the three together form an integral rotating assembly, thereby driving the two inner covers 161 to rotate synchronously when the composite magnetic ring 140 rotates. The inner covers 161 and the support shaft 110 can be rotatably connected through bearings, thereby ensuring that the motor inner housing 160 and the composite magnetic ring 140 can rotate smoothly relative to the support shaft 110, while bearing the radial and axial loads generated during rotation.

[0047] The external gear ring 142 has an overall annular structure, and its central axis is preferably collinear with the central axis of the support shaft 110 to ensure good coaxiality of the external gear ring 142 when the composite magnetic ring 140 rotates. The planetary assembly 150 includes a planet carrier 151 and multiple planetary gears 152 mounted on the planet carrier 151. The planet carrier 151 is generally disc-shaped or spoke-shaped, and the multiple planetary gears 152 are circumferentially spaced on the planet carrier 151. Each planetary gear 152 is rotatably supported on a planetary gear shaft of the planet carrier 151. The planetary gears 152 are located between the composite magnetic ring 140 and the inner wall of the outer casing 120, and mesh with the internal gear ring 121 on the inner wall of the outer casing 120 and the external gear ring 142 on the outer peripheral wall of the composite magnetic ring 140, respectively. The output end of the planet carrier 151 passes through one side of the outer casing 120 to output power.

[0048] Since the outer peripheral wall of the composite magnetic ring 140 is directly formed with an external gear ring 142, and the external gear ring 142 maintains constant meshing with the planetary gears 152, the composite magnetic ring 140 simultaneously assumes the role of the sun gear in a traditional planetary reduction mechanism. When the composite magnetic ring 140 rotates under the action of electromagnetic torque, the external gear ring 142 on its outer peripheral wall drives multiple planetary gears 152 to rotate. Under the constraint of the internal gear ring 121, the planetary gears 152 both rotate around their own axis and revolve along the inner wall of the internal gear ring 121, thereby driving the planet carrier 151 to output a large torque at a relatively low speed. In this way, the composite magnetic ring 140 integrates the dual functions of a rotor and a sun gear in its physical structure, eliminating the need for a separate rotor assembly and sun gear, significantly reducing the number of parts and improving integration.

[0049] Based on the aforementioned highly integrated design, the separate rotor assembly and sun gear avoid occupying additional installation space in the axial and radial directions, making the layout between the composite magnetic ring 140, stator assembly 130, and planetary assembly 150 more compact and significantly reducing the axial and radial dimensions of the hub motor 100. Simultaneously, due to the reduction in the number of parts, the mating hierarchy between components is simplified, and the transmission chain is shorter, which not only helps to reduce the size of the hub motor 100 but also reduces its weight, making the hub motor 100 more suitable for applications with strict limitations on installation space.

[0050] Specifically, in this embodiment, the hub motor 100 further includes a limiting member 170, which is fixed to the support shaft 110 and abuts against the planetary carrier 151. The limiting member 170 can be a bushing structure sleeved on the support shaft 110, with its inner hole adapted to the outer peripheral wall of the support shaft 110, and can be fixedly connected to the support shaft 110 by means of interference fit, key connection or set screw, so as to ensure that the limiting member 170 remains stationary relative to the support shaft 110 during operation.

[0051] The limiting member 170 can axially limit the planet carrier 151, restricting the planet carrier 151 from moving axially along the support shaft 110, thereby ensuring that the meshing position between the planet gear 152 and the internal gear ring 121 and the external gear ring 142 is stable, so that the meshing of each gear pair is always kept within the pre-designed tooth width range, thereby ensuring the smoothness and reliability of power transmission and helping to extend the service life of the planetary assembly 150.

[0052] Please refer to the following: Figure 5 And refer again Figure 3In this embodiment, a support sleeve 1511 is formed at the output end of the planetary carrier 151. The support sleeve 1511 passes through a through hole (not shown) in the side wall of the housing 120 and is rotatably sleeved on the support shaft 110. The support sleeve 1511 is generally integrally formed with the main body of the planetary carrier 151 and extends outward along the axial direction of the support shaft 110 toward the outside of the housing 120.

[0053] A bearing can be installed between the support sleeve 1511 and the support shaft 110 to allow the support sleeve 1511 to rotate smoothly relative to the support shaft 110 while bearing the load from the planetary carrier 151. The inner wall of the support sleeve 1511 maintains a high degree of coaxiality with the outer peripheral wall of the support shaft 110, reducing vibration and noise caused by eccentricity. The sleeve-fitting arrangement of the support sleeve 1511 and the support shaft 110 provides an additional support point for the planetary carrier 151, resulting in a more balanced force distribution during torque output. This effectively suppresses radial sway and axial misalignment, thereby improving the smoothness and reliability of power transmission. Simultaneously, the sleeve-fitting arrangement of the support sleeve 1511 and the support shaft 110 also constrains the radial movement of the planetary carrier 151, further ensuring the meshing accuracy between the planetary gear 152 and the internal gear ring 121 and external gear ring 142.

[0054] More specifically, in this embodiment, the outer wall of the support sleeve 1511 is rotatably engaged with the wall of the through hole of the outer casing 120 through a first bearing 181, and the inner wall of the support sleeve 1511 is rotatably engaged with the support shaft 110 through a second bearing 182.

[0055] Both the first bearing 181 and the second bearing 182 can be provided in two or more, depending on the load-bearing requirements, and are arranged at intervals along the axial direction of the support sleeve 1511. Since the first bearing 181 is located between the outer wall of the support sleeve 1511 and the outer shell 120, and the second bearing 182 is located between the inner wall of the support sleeve 1511 and the support shaft 110, the first bearing 181 and the second bearing 182 are respectively located on the radial sides of the support sleeve 1511, thus forming a double-sided rotary support structure on the support sleeve 1511. In this way, the output end of the planetary carrier 151 can simultaneously receive support from the through hole in the side wall of the outer shell 120 (through the first bearing 181) and support from the support shaft 110 (through the second bearing 182). These two supports cooperate to form a double-sided constraint on the support sleeve 1511 in the radial direction.

[0056] The aforementioned double-sided rotating support structure significantly improves the support stiffness and bending resistance of the planetary carrier 151 during rotation. Specifically, when the hub motor 100 outputs high torque under heavy load conditions, the planetary carrier 151 will bear large tangential and radial forces. If only a single-sided support method is used, the output end of the planetary carrier 151 is prone to radial sway or axial movement, which leads to a deterioration of the gear meshing state. However, by having the first bearing 181 and the second bearing 182 simultaneously provide support reaction forces from the outer and inner sides of the support sleeve 1511, respectively, the force on the support sleeve 1511 is more balanced, which can effectively resist bending deformation caused by heavy load torque, maintain the coaxiality between the planetary carrier 151 and the support shaft 110, and thus ensure the precise meshing position of each gear, improving the reliability of the hub motor 100 under long-term heavy load service conditions.

[0057] Furthermore, in this embodiment, a first oil seal 191 is provided between the outer wall of the support sleeve 1511 and the wall of the through hole in the outer casing 120, and a second oil seal 192 is provided between the inner wall of the support sleeve 1511 and the support shaft 110. Both the first oil seal 191 and the second oil seal 192 can be rotary shaft lip seals, with their lips elastically abutting against the outer and inner walls of the support sleeve 1511 respectively to achieve dynamic sealing. The first oil seal 191 and the second oil seal 192 can effectively prevent the lubricating medium in the hub motor 100 from leaking from the rotating connection.

[0058] Furthermore, in this embodiment, the first oil seal 191 is disposed on the outer side of the first bearing 181, and the second oil seal 192 is disposed on the outer side of the second bearing 182. Here, "outer side" refers to the side away from the internal cavity of the hub motor 100 along the axial direction of the support shaft 110.

[0059] By arranging the first oil seal 191 and the second oil seal 192 on the outer side of each bearing, a sealing barrier can be formed between the bearing and the external environment, effectively preventing dust, moisture, and impurities from entering the bearing and motor interior through the gap between the support sleeve 1511 and the outer casing 120 or between the support sleeve 1511 and the support shaft 110. The first oil seal 191 and the second oil seal 192, in conjunction with the arrangement of the first bearing 181 and the second bearing 182, form a sealing support combination on the inner and outer sides of the support sleeve 1511, ensuring both smooth rotational support and reliable sealing. This helps extend the service life of the first bearing 181 and the second bearing 182 and maintains a clean lubrication environment inside the hub motor 100.

[0060] In addition, in this embodiment, the hub motor 100 also includes a rim 1100, which is rotatably fitted onto the support shaft 110 and is connected to the planetary carrier 151 for transmission.

[0061] The rim 1100, used to mount the tire, is the final actuator for the hub motor 100 to output power. The high torque output from the planetary carrier 151 is transmitted to the rim 1100 via its output end, specifically the support sleeve 1511, driving the rim 1100 and the tire mounted on it to rotate, thereby achieving vehicle propulsion. The rim 1100 and the support shaft 110 can also be rotatably connected via bearings to ensure smooth rotation of the rim 1100 relative to the support shaft 110. Simultaneously, an oil seal can be installed at the mating surface between the rim 1100 and the support shaft 110 to prevent external moisture, dust, and other contaminants from entering the bearing and to prevent bearing grease leakage, ensuring long-term reliable operation of the bearing under good lubrication conditions.

[0062] Furthermore, please refer to the following: Figure 5 and Figure 6 In this embodiment, the rim 1100 and the planetary carrier 151 are connected by a drive mechanism through the insertion and engagement of the boss 1110 and the mating groove 1512.

[0063] The sidewall of the boss 1110 abuts against the sidewall of the mating groove 1512, transmitting driving torque through the contact surface between the sidewalls of the concave and convex structures. Since the power transmission between the rim 1100 and the planetary carrier 151 can be achieved solely through the cooperation of the boss 1110 and the mating groove 1512, no additional fastening methods such as spline connection, bolt locking, or welding are required. The assembly process is simple and quick; the transmission connection between the two can be completed simply by inserting the boss 1110 axially into the mating groove 1512, which significantly simplifies the assembly process and improves assembly efficiency.

[0064] Furthermore, the aforementioned structure eliminates the transmission jerking problem caused by the fit clearance in traditional spline connections. In spline transmissions, due to the necessary assembly clearance between the spline teeth and the additional clearance generated after long-term wear, the alternating contact of the tooth surfaces on both sides of the spline pair during starting, reversing, or sudden load changes can easily generate impacts and jerking sensations, affecting the smoothness of the ride. In contrast, the boss 1110 and the mating groove 1512 employ a zero-clearance or minimal-clearance fit in the circumferential direction. When the rim 1100 rotates, the sidewall of the boss 1110 directly pushes the sidewall of the mating groove 1512, with no relative movement clearance between them. Power transmission is direct, effectively eliminating the transmission jerking phenomenon.

[0065] More specifically, in this embodiment, the boss 1110 is disposed on the rim 1100, and the mating groove 1512 is disposed on the output end of the planetary carrier 151 (specifically, the end face of the support sleeve 1511). Of course, in other embodiments, the positions of the boss 1110 and the mating groove 1512 can also be interchanged.

[0066] Furthermore, multiple bosses 1110 are evenly spaced along the circumference of the support shaft 110, and multiple mating grooves 1512 are also evenly spaced along the circumference of the support shaft 110. The cooperation of these multiple circumferentially spaced bosses 1110 and mating grooves 1512 ensures that the output torque is shared by multiple contact surfaces, avoiding excessive stress or localized wear problems caused by concentrated force in a single plug-in structure. Simultaneously, the evenly spaced distribution ensures that each boss 1110 is uniformly stressed in the circumferential direction, which helps maintain the coaxiality and dynamic balance between the rim 1100 and the planetary carrier 151, further improving the smoothness of power transmission.

[0067] In the aforementioned hub motor 100 and wheeled device, because a permanent magnet 141 is installed on the inner peripheral wall of the composite magnetic ring 140, the composite magnetic ring 140 can function as a traditional rotor assembly. When the stator assembly 130 is energized and generates a rotating magnetic field, it can drive the composite magnetic ring 140 to rotate around it. Simultaneously, because the outer peripheral wall of the composite magnetic ring 140 has an external gear ring 142 that directly meshes with the planetary gear 152, the composite magnetic ring 140 can also function as a traditional sun gear. It can drive the planetary gear 152 to rotate along the internal gear ring 121 via the external gear ring 142, and ultimately achieve high torque output through the planet carrier 151. In other words, the composite magnetic ring 140 achieves a high degree of integration between the rotor assembly and the sun gear in terms of physical structure and function. Thus, the aforementioned hub motor 100, while ensuring high torque output, can also significantly reduce the total number of parts, thereby simplifying the structure and improving integration.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A wheel hub motor (100), characterized in that, include: Support shaft (110); The housing (120) is mounted on the support shaft (110), and an internal gear ring (121) is formed on the inner wall of the housing (120). The stator assembly (130) is housed in the housing (120) and fixed to the support shaft (110); A composite magnetic ring (140) has a permanent magnet (141) on its inner peripheral wall and an outer toothed ring (142) formed on its outer peripheral wall. The composite magnetic ring (140) is rotatably sleeved on the outer periphery of the stator assembly (130). and The planetary assembly (150) includes a planet carrier (151) and a plurality of planetary gears (152) mounted on the planet carrier (151). The planetary gears (152) are located between the composite magnetic ring (140) and the inner wall of the housing (120) and mesh with the internal gear ring (121) and the external gear ring (142). The output end of the planet carrier (151) rotatably passes through the housing (120). The output end of the planetary carrier (151) is formed with a support sleeve (1511). The support sleeve (1511) passes through a hole in the side wall of the outer shell (120) and is rotatably sleeved on the support shaft (110). The outer wall of the support sleeve (1511) and the hole wall of the hole are rotatably engaged by a first bearing (181). The inner wall of the support sleeve (1511) and the support shaft (110) are rotatably engaged by a second bearing (182).

2. The hub motor (100) according to claim 1, characterized in that, The support shaft (110) has a wire groove (111) inside, one end of which extends to the outside of the housing (120) and the other end extends to the inside of the stator assembly (130).

3. The hub motor (100) according to claim 1, characterized in that, The internal gear ring (121) is interference-fitted to the inner wall of the outer shell (120).

4. The hub motor (100) according to claim 1, characterized in that, It also includes a motor inner housing (160), which is housed in the outer housing (120) and rotatably mounted on the support shaft (110), the stator assembly (130) is housed in the motor inner housing (160), and the composite magnetic ring (140) is fixedly mounted on the outer periphery of the motor inner housing (160).

5. The hub motor (100) according to claim 4, characterized in that, The motor housing (160) includes two inner side covers (161) arranged opposite to each other. Both inner side covers (161) are rotatably sleeved on the support shaft (110) and fixedly connected to the opposite sides of the composite magnetic ring (140). The stator assembly (130) is located between the two inner side covers (161).

6. The hub motor (100) according to claim 1, characterized in that, It also includes a limiting member (170), which is fixed to the support shaft (110) and abuts against the planetary carrier (151).

7. The hub motor (100) according to claim 1, characterized in that, A first oil seal (191) is provided between the outer wall of the support sleeve (1511) and the hole wall of the through hole, and a second oil seal (192) is provided between the inner wall of the support sleeve (1511) and the support shaft (110).

8. The hub motor (100) according to claim 7, characterized in that, The first oil seal (191) is disposed on the outside of the first bearing (181), and the second oil seal (192) is disposed on the outside of the second bearing (182).

9. The hub motor (100) according to claim 1, characterized in that, It also includes a rim (1100), which is rotatably fitted onto the support shaft (110) and is connected in a transmission manner to the planetary carrier (151).

10. The hub motor (100) according to claim 9, characterized in that, The rim (1100) and the planetary carrier (151) are connected by a drive mechanism through a boss (1110) and a mating groove (1512).

11. The hub motor (100) according to claim 10, characterized in that, The boss (1110) is disposed on the rim (1100), and the plurality of bosses (1110) are equally spaced along the circumference of the support shaft (110). The mating groove (1512) is disposed on the output end of the planetary carrier (151), and the plurality of mating grooves (1512) are equally spaced along the circumference of the support shaft (110).

12. A wheeled device, characterized in that, Includes a hub motor (100) as described in any one of claims 1 to 11 above, and the hub motor (100) provides driving force.

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