Outer rotor wheel hub motor and vehicle

Abstract

The application discloses an outer rotor wheel hub motor and a vehicle, and belongs to the technical field of wheel hub motors. The outer rotor wheel hub motor comprises a cooling water jacket, a first extension part and a second extension part which are respectively arranged at the two ends of a sleeve part in the axial direction, the first extension part and the second extension part extend along the radial direction of the sleeve part, and the sleeve part, the first extension part and the second extension part are all provided with communicated cooling flow channels for heat exchange medium circulation; a stator assembly is sleeved outside the sleeve part of the cooling water jacket and located between the first extension part and the second extension part; and a rotor assembly is sleeved outside the stator assembly. The sleeve part, the first extension part and the second extension part are arranged to dissipate heat from the inner ring of the stator assembly and the two ends of the winding, the heat dissipation effect of the stator assembly is better, the service life is prolonged, the energy consumption is reduced, and the cruising range of the vehicle is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hub motors, and particularly relates to an outer rotor hub motor and a vehicle. BACKGROUND

[0002] With the rapid development of the new energy vehicle industry in China, the hub motor system is one of the key technical directions of new energy vehicles due to the advantages of saving traditional transmission components and high efficiency. The heat dissipation design of a general hub motor is difficult to meet the heat dissipation requirements of the hub motor, thereby affecting the performance of the hub motor. SUMMARY

[0003] The application aims to at least solve one of the technical problems in the prior art. To this end, the application provides an outer rotor hub motor and a vehicle, which has better heat dissipation effect on the stator assembly, prolongs the service life, reduces the energy consumption, and helps improve the cruising range of the vehicle.

[0004] In a first aspect, the application provides an outer rotor hub motor, comprising:

[0005] A cooling jacket, comprising a sleeve portion and first and second extension portions respectively arranged at two ends in the axial direction of the sleeve portion, the first and second extension portions each extend in the radial direction of the sleeve portion, and the sleeve portion, the first extension portion and the second extension portion each have a cooling flow channel in communication for the flow of a heat exchange medium;

[0006] A stator assembly, which is sleeved outside the sleeve portion of the cooling jacket and located between the first and second extension portions;

[0007] A rotor assembly, which is sleeved outside the stator assembly.

[0008] According to the outer rotor hub motor of the application, the sleeve portion, the first extension portion and the second extension portion are arranged to dissipate heat from the inner ring of the stator assembly and the two ends of the winding, so that the heat dissipation effect on the stator assembly is better, the service life of the outer rotor hub motor is prolonged, the energy consumption is reduced, stable power output is provided, the maintenance cost is reduced, and the hub motor with higher power density can be adapted, the cruising range of the vehicle is improved, and the unsprung mass is reduced.

[0009] According to an embodiment of the application, the first and second extension portions are each arranged in a ring shape, the cooling flow channel in the interior includes a plurality of first flow channels distributed in the radial direction thereof, the first flow channels extend in the circumferential direction, and adjacent two first flow channels are connected by at least one communication port.

[0010] According to an embodiment of the application, the inner ring of the first extension portion is provided with a first inlet and a first outlet, and the inner ring of the second extension portion is provided with a second inlet and a second outlet.

[0011] The first inlet and the second inlet are in communication with the outermost first flow channels of the corresponding plurality of first flow channels, and the first outlet and the second outlet are in communication with the innermost first flow channels of the corresponding plurality of first flow channels;

[0012] The first inlet, the first outlet, the second inlet and the second outlet are in communication with the cooling flow channels in the sleeve portion.

[0013] According to an embodiment of the present application, one end of the sleeve portion in the axial direction is provided with a total inlet and a total outlet, the first inlet is in position correspondence and direct communication with the total inlet, and the first outlet is in position correspondence and direct communication with the total outlet.

[0014] According to an embodiment of the present application, the sleeve portion is provided with a main flow channel extending in the axial direction and a plurality of second flow channels extending in the circumferential direction of the sleeve portion, the plurality of second flow channels are distributed along the axial direction of the sleeve portion, and adjacent two second flow channels are in communication through at least one communication port.

[0015] One end of the main flow channel is in communication with the total inlet and the first inlet, and the other end of the main flow channel is in communication with the second inlet and the second flow channel closest to the second extension portion of the plurality of second flow channels.

[0016] According to an embodiment of the present application, one end of the rotor assembly in the axial direction is connected with a brake shoe, and the first extension portion is close to the brake shoe.

[0017] According to an embodiment of the present application, the radial dimension of the first extension portion is smaller than that of the second extension portion.

[0018] The first extension portion is provided with a through-line passage and a gas permeable hole.

[0019] According to an embodiment of the present application, the radial dimension of the part of the first extension portion and the second extension portion located outside the periphery of the sleeve portion is greater than that of the stator assembly, so that the sleeve portion and the first extension portion and the second extension portion together define a potting space for potting the stator assembly.

[0020] The potting space is provided with potting glue wrapped outside the stator assembly.

[0021] According to an embodiment of the present application, the outer peripheral wall of the sleeve portion is provided with a plurality of key grooves distributed in the circumferential direction, and the inner side of the stator assembly is provided with a protrusion matched with the key grooves.

[0022] In a second aspect, the present application provides a vehicle comprising the outer rotor hub motor as any of the technical solutions in the first aspect.

[0023] The vehicle according to this application can improve driving stability, increase driving range, reduce unsprung mass, and improve overall vehicle performance.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is one of the cross-sectional structural schematic diagrams of the external rotor hub motor provided in the embodiments of this application;

[0027] Figure 2 This is a cross-sectional structural diagram of the first extension provided in an embodiment of this application;

[0028] Figure 3 This is a cross-sectional structural diagram of the second extension provided in an embodiment of this application;

[0029] Figure 4 This is one of the structural schematic diagrams of the sleeve portion provided in the embodiments of this application;

[0030] Figure 5 This is a second schematic diagram of the sleeve portion provided in the embodiments of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the cooling water jacket provided in the embodiments of this application;

[0032] Figure 7 This is an exploded structural diagram of the cooling water jacket provided in the embodiments of this application;

[0033] Figure 8 This is the second cross-sectional structural schematic diagram of the external rotor hub motor provided in the embodiments of this application;

[0034] Figure 9 This is a schematic diagram of the assembly structure of the stator assembly and rotor assembly provided in the embodiments of this application;

[0035] Figure 10 yes Figure 9 A magnified view of a portion of the image.

[0036] Figure label:

[0037] 1. External rotor hub motor; 11. Cooling water jacket; 111. Sleeve section; 1111. Inner ring; 1112. Outer ring; 1113. Keyway; 1114. Heat insulation component; 112. First extension; 1121. First inlet; 1122. First outlet; 1123. Wiring passage; 1124. Vent hole; 113. Second extension; 1131. Second inlet; 1132. Second outlet; 114. Main inlet; 115. Main outlet; 116. First flow channel; 117. Main flow channel; 118. Second flow channel; 12. Stator assembly; 13. Rotor assembly; 131. Rotor outer sleeve; 132. Rotor core; 133. Magnet; 14. Brake pad; 15. High-voltage junction box. Detailed Implementation

[0038] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0039] The following is for reference. Figures 1-10 This application describes an external rotor hub motor according to an embodiment of the present application.

[0040] Please see Figure 1 The external rotor hub motor 1 provided in this application embodiment includes a cooling water jacket 11, a stator assembly 12 and a rotor assembly 13.

[0041] The cooling water jacket 11 includes a sleeve portion 111 and a first extension portion 112 and a second extension portion 113 respectively disposed at both ends of the sleeve portion 111 along the axial direction. The first extension portion 112 and the second extension portion 113 both extend radially along the sleeve portion 111. The sleeve portion 111, the first extension portion 112 and the second extension portion 113 are all provided with communicating cooling channels for heat exchange medium to circulate.

[0042] The cooling water jacket 11 serves to support and fix the stator assembly 12. The cooling water jacket 11 includes a sleeve portion 111, a first extension portion 112, and a second extension portion 113. The sleeve portion 111 is cylindrical to facilitate support on the inner side of the stator assembly 12 and provide sufficient support force. The first extension portion 112 and the second extension portion 113 are respectively located at both axial ends of the sleeve portion 111 and extend radially outward from the outer side of the sleeve portion 111, so that the first extension portion 112 and the second extension portion 113 correspond to the stator assembly 12 fitted outside the sleeve portion 111. The sleeve portion 111, the first extension portion 112, and the second extension portion 113 are all provided with cooling channels for the flow of heat exchange medium, and the cooling channels inside the three are interconnected, allowing the cooling medium to flow and exchange heat within the sleeve portion 111, the first extension portion 112, and the second extension portion 113.

[0043] The stator assembly 12 is sleeved outside the sleeve portion 111 of the cooling water jacket 11 and located between the first extension portion 112 and the second extension portion 113; the rotor assembly 13 is sleeved outside the stator assembly 12.

[0044] The stator assembly 12 is mainly responsible for generating a rotating magnetic field, which drives the rotor assembly 13 to rotate through electromagnetic induction, thereby realizing the conversion of electrical energy into mechanical energy. The rotor assembly 13 is mounted on the stator assembly 12 and is rotatable relative to the stator assembly 12, thereby realizing the conversion of electrical energy into mechanical energy. The rotor assembly 13 is used to fix and connect to the wheel to drive the wheel to rotate.

[0045] By sleeved around the sleeve portion 111 and positioned between the first extension portion 112 and the second extension portion 113, the inner ring 1111 of the stator assembly 12 dissipates heat through the cooling channels within the sleeve portion 111, while the axial ends of the stator assembly 12 dissipate heat through the cooling channels within the first extension portion 112 and the second extension portion 113. This helps to evenly distribute and absorb the heat generated by the stator assembly 12, preventing localized overheating, increasing the heat dissipation area, significantly improving the heat dissipation efficiency of the stator assembly 12, effectively controlling the heat generated by the motor during operation, and improving the stability of motor operation. Furthermore, the compact design not only reduces the overall size of the motor but also simplifies the installation process, allowing for flexible placement of the motor even in space-constrained applications.

[0046] Furthermore, due to the enhanced heat exchange capacity, it can be applied to hub motors with higher power density, and the temperature of the outer rotor hub motor 1 can also be effectively controlled. The power of the outer rotor hub motor 1 can be increased while maintaining the same volume; or the volume of the stator assembly 12 can be reduced while keeping the total power of the outer rotor hub motor 1 constant, facilitating the installation of the cooling water jacket 11 and reducing the overall mass of the outer rotor hub motor 1, thereby helping to reduce the unsprung mass of the vehicle and further improving the vehicle's driving range.

[0047] According to the embodiments of this application, the external rotor hub motor 1 is provided with a sleeve portion 111, a first extension portion 112 and a second extension portion 113 to dissipate heat from the inner ring 1111 of the stator assembly 12 and both ends of the winding. This results in better heat dissipation of the stator assembly 12, extends the service life of the external rotor hub motor 1, reduces energy consumption, provides stable power output, reduces maintenance costs, and can be adapted to hub motors with higher power density, thereby helping to improve the vehicle's driving range and reduce unsprung mass.

[0048] Please see Figure 2 and Figure 3 According to some embodiments of this application, the first extension 112 and the second extension 113 are both arranged in a ring shape, and the internal cooling channels can each include a plurality of first channels 116 distributed radially thereon. The first channels 116 extend in a circumferential direction, and two adjacent first channels 116 can have at least one connecting port.

[0049] Both the first extension 112 and the second extension 113 can be arranged around the sleeve portion 111. By setting the first extension 112 and the second extension 113 as annular, the cooling area at the end of the stator assembly 12 is increased, thereby improving the cooling effect. The cold zone flow channels inside the first extension 112 and the second extension 113 each include multiple first flow channels 116. It is understood that adjacent first flow channels 116 are spaced apart. By providing multiple first flow channels 116 distributed radially, after the heat exchange medium enters the first extension 112 or the second extension 113, it can be evenly distributed within the multiple first flow channels 116, allowing the heat exchange medium to fill the first extension 112 and the second extension 113 as much as possible, ensuring the heat exchange effect.

[0050] The first flow channel 116 extends circumferentially to prolong its length. Adjacent first flow channels 116 are connected by at least one connecting port to facilitate the flow of heat exchange medium among the multiple first flow channels 116. It should be noted that the number of first flow channels 116 is not limited, and the number of first flow channels 116 in the first extension 112 and the second extension 113 may be the same or different, depending on factors such as the stator size and heat exchange requirements. For example, the first extension 112 has two first flow channels 116, and the second extension 113 has three first flow channels 116.

[0051] Please see Figure 2 and Figure 3 According to some embodiments of this application, the inner ring 1111 of the first extension 112 may be provided with a first inlet 1121 and a first outlet 1122, and the inner ring 1111 of the second extension 113 may be provided with a second inlet 1131 and a second outlet 1132; the first inlet 1121, the first outlet 1122, the second inlet 1131 and the second outlet 1132 are all connected to the cooling channel in the sleeve portion 111.

[0052] Because the first extension 112 and the second extension 113 are sleeved outside the sleeve portion 111, the first inlet 1121 and the first outlet 1122 are provided in the inner ring 1111 of the first extension 112 so that the first flow channel 116 in the first extension 112 is connected to the cooling flow channel in the sleeve portion 111 through the first inlet 1121 and the first outlet 1122. The second inlet 1131 and the second outlet 1132 are provided in the inner ring 1111 of the second extension 113 so that the second flow channel 118 in the second extension 113 is connected to the cooling flow channel in the sleeve portion 111 through the second inlet 1131 and the second outlet 1132.

[0053] Both the first inlet 1121 and the second inlet 1131 can be connected to the outermost first flow channel 116 among the corresponding plurality of first flow channels 116, and both the first outlet 1122 and the second outlet 1132 can be connected to the innermost first flow channel 116 among the corresponding plurality of first flow channels 116.

[0054] like Figure 2 and Figure 3As shown, by connecting the outermost first flow channel 116 among the multiple first flow channels 116 corresponding to the first inlet 1121 and the second inlet 1131, and connecting the first outlet 1122 and the second outlet 1132 with the innermost first flow channel 116 among the multiple first flow channels 116, the heat exchange medium, after entering the first extension 112 or the second extension 113, first flows to the outermost first flow channel 116, then flows to the innermost first flow channel 116, and finally flows out from the innermost first flow channel 116. This allows the heat exchange medium to fill each first flow channel 116, improving the filling rate of the heat exchange medium in the first extension 112 and the second extension 113, avoiding the influence of factors such as gravity and inertia, which would prevent the heat exchange medium from failing to fill the first extension 112 and the second extension 113, thus improving the heat exchange effect.

[0055] In order to improve the filling rate of the multiple first flow channels 116, the outermost first flow channel 116 is in a ring shape with its ends connected, and the beginning and end of the outermost first flow channel 116 are spaced apart. The first inlet 1121 or the second inlet 1131 is connected to the beginning of the corresponding outermost first flow channel 116. The communication port between the outermost first flow channel 116 and the adjacent first flow channel 116 is located at the end of the outermost first flow channel 116, so that the liquid cooling medium can fill the outermost first flow channel 116.

[0056] Please see Figure 4 , Figure 5 and Figure 6 According to some embodiments of this application, one axial end of the sleeve portion 111 may be provided with a total inlet 114 and a total outlet 115. The first inlet 1121 may correspond to and be directly connected to the total inlet 114, and the first outlet 1122 may correspond to and be directly connected to the total outlet 115.

[0057] Because the sleeve portion 111 plays a major supporting role and is also used for connection with the vehicle body, the stability of the pipeline connection is improved by setting the total inlet 114 and the total outlet 115 on the sleeve portion 111. The total inlet 114 and the total outlet 115 serve as the total inlet 114 and the total outlet 115 of the heat exchange medium in the entire cooling water jacket 11.

[0058] The first extension 112 is located at one end of the sleeve portion 111 near the main inlet 114, and the first inlet 1121 corresponds to the main inlet 114 radially in the sleeve portion 111, so that the first inlet 1121 can be directly connected to the main inlet 114. After the heat exchange medium enters the main inlet 114, it is directly split, with one part entering the first extension 112 and the other part entering the cooling channel of the sleeve portion 111. Furthermore, the first outlet 1122 can also correspond to the main outlet 115 radially in the sleeve portion 111, so that the first outlet 1122 can be directly connected to the main outlet 115. This results in a shorter distance between the first channel 116 in the first extension 112 and the main inlet 114 and main outlet 115, leading to a lower temperature and better heat exchange effect in the first extension 112.

[0059] It is understandable that the heat exchange medium of the outer rotor hub motor 1 is generally transported by a pipeline connected to the heat exchanger on the vehicle body. Therefore, the total outlet 115 and the total inlet 114 of the sleeve portion 111 are generally located on the side close to the vehicle body, and the temperature on this side is generally higher. By setting the length of the first flow channel 116 in the first extension portion 112 to be the shortest, the heat exchange effect of the first extension portion 112 is improved.

[0060] Please see Figure 4 and Figure 5 According to some embodiments of this application, the sleeve portion 111 is provided with a main flow channel 117 extending axially and a plurality of second flow channels 118 extending circumferentially around the sleeve portion 111. The plurality of second flow channels 118 are distributed along the axial direction of the sleeve portion 111, and two adjacent second flow channels 118 are connected through at least one communication port. One end of the main flow channel 117 is connected to both the main inlet 114 and the first inlet 1121, and the other end of the main flow channel 117 is connected to the second inlet 1131 and the second flow channel 118 closest to the second extension portion 113 among the plurality of second flow channels 118.

[0061] The cooling channels within the sleeve portion 111 include a main channel 117 and a plurality of second channels 118. The plurality of second channels 118 can be distributed along the axial direction of the sleeve portion 111. By providing a plurality of second channels 118, the heat exchange area to the stator assembly 12 is increased, thereby improving the heat exchange effect. A communication port is provided between two adjacent second channels 118 to facilitate the communication of the heat exchange medium between the plurality of second channels 118.

[0062] The main channel 117 extends axially along the sleeve portion 111. One end of the main channel 117 is connected to the total inlet 114 and the first inlet 1121. After the heat exchange medium enters the total inlet 114, part of it enters the first inlet 1121, and the other part flows along the main channel 117 to the other end of the main channel 117. The other end of the main channel 117 is connected to the second channel 118 closest to the second extension portion 113 and the second inlet 1131 among a plurality of second channels 118, so that the heat exchange medium is split at the other end of the main channel 117. Part of it enters the second extension portion 113 through the second inlet 1131, and the other part enters the second channel 118 closest to the second extension portion 113, and flows through a plurality of second channels 118 in sequence and flows out through the total outlet 115.

[0063] Please see Figure 7 and Figure 8 According to some embodiments of this application, one axial end of the rotor assembly 13 is connected to a brake pad 14, and the first extension 112 is close to the brake pad 14.

[0064] Brake pads 14 are integrated on the rotor assembly 13 to facilitate wheel braking. However, brake pads 14 generate a lot of heat during operation. By setting a first extension 112 close to the brake pads 14, the heat exchange medium has the shortest flow path in the first extension 112, resulting in a lower temperature of the heat exchange medium. This serves to insulate the brake pads from heat and improve the heat exchange effect on the stator assembly 12.

[0065] Please see Figure 7 According to some embodiments of this application, the radial dimension of the first extension 112 is smaller than that of the second extension 113; the first extension 112 is provided with a through wire passage 1123 and a vent hole 1124.

[0066] It should be noted that, in order to facilitate the assembly of the stator assembly 12 and the cooling water jacket 11, the first extension 112 and the second extension 113 are welded to the sleeve portion 111 respectively. First, the stator assembly 12 is sleeved on the sleeve portion 111, and then the first extension 112 and the second extension 113 are welded and fixed. In order to facilitate the positioning of the axial installation position of the stator assembly 12, a boss can be provided at one end of the sleeve portion 111 near the first extension 112. The boss can abut and limit the stator assembly 12. The first extension 112 is sleeved on the boss, so that the inner diameter of the first extension 112 is larger than the outer diameter of the second extension 113, and the radial dimension of the first extension 112 is smaller than the radial dimension of the second extension 113.

[0067] Furthermore, since the first extension 112 is located on the side close to the vehicle body, in order to facilitate the wiring of the stator assembly 12 and to remove the heat generated during operation, the first extension 112 is provided with a wire passage 1123 and a vent 1124. The wire passage 1123 allows the high-voltage wire harness of the stator assembly 12 to pass through, and the vent 1124 is used to discharge the gas generated during the operation of the stator assembly 12.

[0068] For example, the wire passage 1123 can be fan-shaped. Due to the limitation of the wire passage 1123, the first extension 112 can only have one first flow channel 116 at the position where the wire passage 1123 is provided. The vent hole 1124 can be a circular hole. The circular hole can be connected to the inner ring 1111 of the first extension 112 to leave space for the first flow channel 116. The flow size of the first flow channel 116 in the first extension 112 corresponding to the position where the vent hole 1124 is provided can be locally reduced to ensure the connectivity of the first flow channel 116.

[0069] The outer rotor hub motor 1 may also include a high-voltage junction box 15 for connecting the high-voltage wiring harness led out from the nail assembly. The high-voltage junction box 15 can be fixedly installed on the cold zone water jacket by screws.

[0070] Please see Figures 4-7 In some embodiments, a heat insulation member 1114 may be provided between the brake pad 14 and the first extension 112 to reduce the impact of the heat of the brake pad 14 on the first extension 112, thereby improving the heat exchange effect of the first extension 112 and the entire cooling water jacket 11.

[0071] For example, the heat insulation component 1114 can be integrally formed with the end of the sleeve portion 111 near the brake pad 14 to improve the overall structural strength and provide heat insulation. The heat insulation component 1114 may be provided with openings corresponding to the wire passage 1123 and the vent hole 1124.

[0072] Please see Figure 8 According to some embodiments of this application, the radial dimensions of the portions of the first extension 112 and the second extension 113 located on the outer periphery of the sleeve portion 111 can both be larger than the stator assembly 12, so that the sleeve portion 111, the first extension 112, and the second extension 113 can jointly define a potting space for potting the stator assembly 12; the potting space is provided with potting adhesive wrapped around the stator assembly 12.

[0073] The potting compound can be made of a thermally conductive material with good thermal conductivity. By setting the potting compound, the contact area between the stator assembly 12 and the sleeve portion 111, the first extension portion 112 and the second extension portion 113 can be increased, thereby improving the overall heat exchange effect. It can also serve to insulate and protect the windings on the stator assembly 12.

[0074] In related technologies, after the stator assembly 12 is installed on the bracket, a special potting fixture is required to pot the stator assembly 12. In this application, because the radial dimensions of the first extension 112 and the second extension 113 are larger than those of the stator assembly 12, after the stator assembly 12 is installed outside the sleeve portion 111, the stator assembly 12 is completely contained within the potting space formed by the first extension 112, the second extension 113 and the sleeve portion 111. Thus, the first extension 112 and the second extension 113 serve as part of the potting fixture, thereby simplifying the structure and cost of the potting fixture, and improving the potting efficiency and potting effect.

[0075] Please see Figure 7 and Figure 8 In some embodiments, the sleeve portion 111 may include an inner sleeve and an outer sleeve. The outer circumferential surface of the inner sleeve is machined with multiple grooves, and the outer sleeve is fitted over the inner sleeve to define the main flow channel 117 and multiple second flow channels 118 together with the multiple grooves. The inner sleeve and the outer sleeve can be fixedly connected and sealed by welding. By setting the inner sleeve and the outer sleeve, the machining difficulty of the cooling flow channels in the sleeve portion 111 is reduced, and the production cost is reduced.

[0076] Please see Figure 6 , Figure 7 and Figure 8 According to some embodiments of this application, the outer peripheral wall of the sleeve portion 111 may be provided with a plurality of keyways 1113 distributed circumferentially, and the inner side of the stator assembly 12 may be provided with a protrusion that cooperates with the keyways 1113.

[0077] Understandably, both the keyway 1113 and the protrusion extend axially along the sleeve portion 111. By providing the keyway 1113 and the protrusion, the stator assembly 12 is circumferentially positioned when installed on the sleeve portion 111, thereby improving the installation accuracy of the stator assembly 12. To reduce assembly difficulty and improve assembly efficiency, the number of protrusions on the stator assembly 12 can be less than the number of keyways 1113. Furthermore, grooves corresponding to the keyways 1113 are provided in positions where no protrusions are provided. During assembly, the protrusions are first matched with a portion of the keyways 1113 to fit the stator assembly 12 onto the sleeve portion 111. Then, a limiting key is inserted in the keyway 1113 position where no protrusion is provided to further position the stator assembly 12 and improve the stability of the installation.

[0078] According to the external rotor hub motor 1 provided in the embodiments of this application, during the assembly process of the stator assembly 12 and the cooling water jacket 11, the inner ring 1111 of the sleeve portion 111 is welded and fixed to the outer ring 1112 to ensure sealing. Then, the protrusion on the stator assembly 12 is aligned with the keyway 1113, so that the stator assembly 12 is axially assembled to the outside of the sleeve portion 111 until it abuts and limits the engagement with the boss outside the sleeve portion 111. Then, the first extension portion 112 and the second extension portion 113 are welded to the sleeve portion 111 to ensure a fixed connection and a sealed flow channel. Then, the stator assembly 12 is potted so that the potting compound wraps around the outside of the stator assembly 12 and fully contacts the first extension portion 112, the second extension portion 113 and the sleeve portion 111.

[0079] Please see Figure 9 and Figure 10 In some embodiments, the external rotor hub motor 1 provided in this application can adopt a 48-pole, 54-slot scheme. The permanent magnet can be made of high-energy-product neodymium iron boron permanent magnet material, and the magnet 133 is surface-mounted. The number of poles of the magnet 133 is increased from 16 to 48. Both methods reduce the requirements for the thickness of the yoke and the thickness of the magnet 133. The thickness of the yoke is reduced from 7.28 mm to 5 mm, and the thickness of the magnet 133 is reduced from 6 mm to 4 mm. Ultimately, the rotor weight is reduced from 6.98 kg to 3.54 kg, which helps to achieve a lightweight rotor design.

[0080] The rotor assembly 13 may include a rotor core 132 and a rotor outer sleeve 131. Magnets 133 are glued to the grooves of the rotor core 132. The alternating design of slots and protrusions prevents the magnets 133 from slipping from the rotor when under force, ensuring that the torque on the magnets 133 is transmitted to the rotor core 132. The rotor core 132 is press-fitted into the inner cavity of the rotor outer sleeve 131. The outer side of the rotor core 132 is designed with protrusions that fit with the grooves on the inner side of the rotor outer sleeve 131. The interference fit ensures the transmission of torque. The rotor outer sleeve 131 is mounted on the inner ring 1111 of the hub bearing through a stop and bolts.

[0081] With the rotor yoke thickness reduced, the electromagnetic air gap remains unchanged at 0.75mm, allowing for an increase in the inner and outer diameters of the stator assembly 12. The stator core of the stator assembly 12 uses thin silicon steel sheets to reduce losses. The number of stator slots increases from 18 to 54, reducing slot width and depth, which can reduce the stator yoke height and thus increase the inner diameter of the stator assembly 12, thereby increasing the contact area between the stator assembly 12 and the sleeve section 111 and improving heat exchange efficiency. The stator windings are made of high conductivity, high temperature resistant copper enameled wire, with multiple sets wound in pairs in each slot of the stator core, increasing the slot fill factor, reducing the winding end length, and reducing the stator weight. This results in a reduction in stator weight from 15.92kg to 9.94kg, contributing to the lightweight stator design.

[0082] This application also provides a vehicle including an external rotor hub motor 1 as described in any of the above technical solutions.

[0083] It should be noted that, since the vehicle in this application embodiment includes the external rotor hub motor 1 as described in any of the above technical solutions, it has the technical features and effects of the external rotor hub motor 1 as described in any of the above technical solutions, which will not be elaborated here.

[0084] The vehicle provided according to the embodiments of this application can improve the driving stability of the vehicle, increase the driving range, reduce the unsprung mass, and improve the overall performance of the vehicle.

[0085] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0086] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0087] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0088] In the description of this application, "multiple" means two or more.

[0089] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0090] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0092] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An external rotor hub motor, characterized in that, include: A cooling water jacket includes a sleeve portion and a first extension portion and a second extension portion respectively disposed at both ends of the sleeve portion along the axial direction. The first extension portion and the second extension portion both extend radially along the sleeve portion. The sleeve portion, the first extension portion and the second extension portion are all provided with communicating cooling channels for heat exchange medium to flow through. The stator assembly is sleeved outside the sleeve portion of the cooling water jacket and located between the first extension and the second extension; The rotor assembly is fitted outside the stator assembly; One axial end of the rotor assembly is connected to a brake pad, and the first extension is located at the end of the sleeve portion near the vehicle body, and the first extension is close to the brake pad. The heat exchange medium in the first extension has the shortest flow path, which serves to insulate the brake pads and improve the heat exchange effect on the stator assembly, thereby reducing the volume of the stator assembly.

2. The external rotor hub motor according to claim 1, characterized in that, Both the first extension and the second extension are arranged in a ring shape, and the cooling channels inside each include a plurality of first channels distributed radially thereon. The first channels extend in a circumferential direction, and two adjacent first channels are connected by at least one connecting port.

3. The external rotor hub motor according to claim 2, characterized in that, The inner ring of the first extension is provided with a first inlet and a first outlet, and the inner ring of the second extension is provided with a second inlet and a second outlet; Both the first inlet and the second inlet are connected to the outermost first flow channel among the corresponding plurality of first flow channels, and both the first outlet and the second outlet are connected to the innermost first flow channel among the corresponding plurality of first flow channels. The first inlet, the first outlet, the second inlet, and the second outlet are all connected to the cooling channel inside the sleeve.

4. The external rotor hub motor according to claim 3, characterized in that, The sleeve portion has a main inlet and a main outlet at one axial end. The first inlet corresponds to and is directly connected to the main inlet, and the first outlet corresponds to and is directly connected to the main outlet.

5. The external rotor hub motor according to claim 4, characterized in that, The sleeve portion is provided with a main flow channel extending along the axial direction and a plurality of second flow channels extending circumferentially around the sleeve portion. The plurality of second flow channels are distributed along the axial direction of the sleeve portion, and two adjacent second flow channels are connected through at least one communication port. One end of the main flow channel is connected to both the main inlet and the first inlet, and the other end of the main flow channel is connected to the second inlet and the second flow channel closest to the second extension among a plurality of second flow channels.

6. The external rotor hub motor according to claim 5, characterized in that, The radial dimension of the first extension is smaller than that of the second extension; The first extension is provided with a through-hole for wires and a ventilation hole.

7. The external rotor hub motor according to any one of claims 1-6, characterized in that, The radial dimensions of the portions of the first extension and the second extension located on the outer periphery of the sleeve portion are both larger than the stator assembly, so that the sleeve portion, together with the first extension and the second extension, defines a potting space for potting the stator assembly. The potting space contains potting compound that wraps around the stator assembly.

8. The external rotor hub motor according to any one of claims 1-6, characterized in that, The outer peripheral wall of the sleeve portion is provided with a plurality of keyways distributed circumferentially, and the inner side of the stator assembly is provided with a protrusion that mates with the keyways.

9. A vehicle, characterized in that, Including the external rotor hub motor as described in any one of claims 1-8.

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