Detachable hub motor and vehicle

Abstract

The invention provides a detachable hub motor and a vehicle. A main shaft of a hub motor body is provided with a through hole; the connecting rod penetrates through the through hole and is detachably connected with the frame; the hub motor body comprises a motor shell, and a sun gear, a stator assembly, a rotor assembly and a planetary gear assembly which are arranged on the periphery of the main shaft in a sleeving mode are arranged in the motor shell. The sun gear is tightly attached to the outer side wall of the main shaft, a bearing sleeve is arranged on the stator assembly and connected with the outer side wall of the sun gear through a first bearing, and the planetary gear assembly is connected with the outer side wall of the sun gear through a second bearing. The penetrating through hole is formed in the motor spindle, the threaded rod penetrates through the penetrating through hole to achieve installation of the motor and a vehicle, it is guaranteed that the motor is installed in the center of a vehicle frame, meanwhile, in order to guarantee that the output torque of the motor cannot be reduced after the motor is arranged, the installation mode of the sun gear and the bearing is adjusted, and the reduction ratio is increased; and the output torque is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor drive, and specifically, to a detachable hub motor and a vehicle, especially a quick-detachable hub motor. Background Art

[0002] The connection between a traditional hub motor and a vehicle frame requires nuts to connect the two shafts on both sides of the hub motor to the vehicle frame, and the wire harness connection is achieved by inserting an interference-type connector. This connection method has the following disadvantages: a. Connecting to the vehicle frame requires tightening nuts on both sides, and good technology is needed to ensure that the hub motor is installed in the center of the vehicle frame; b. The locking nuts on both sides protrude outside the vehicle, affecting the overall aesthetics; c. In order to achieve good waterproofing effect, the interference amount of the wire harness connector is large, resulting in a relatively large insertion force and being laborious to disassemble and assemble; d. The torque density is small, where torque density refers to the torque that an object of unit volume or mass can generate. Therefore, it is necessary to adjust the structure of the hub motor to solve the above problems and ensure that the output torque of the hub motor is not affected too much.

[0003] The patent document with the publication number CN115811172A discloses an integrated hub motor, including a hub housing and a rotating shaft passing through the hub housing. Inside the hub housing, there are integrally installed: a disc motor, including a stator and a rotor that cooperate with each other, with the rotor sleeved on the rotating shaft; a speed reducer, including several gears that mesh and link with each other, sleeved on the rotating shaft and linked with the disc motor; an overrunning clutch, connected to the speed reducer and sleeved on the rotating shaft; and an oil injection hole is provided on the hub housing. However, this patent document still has the defect that the locking nuts on both sides protrude outside the vehicle, affecting the overall aesthetics. Summary of the Invention

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a detachable hub motor and a vehicle.

[0005] According to a detachable hub motor provided by the present invention, it includes: a hub motor body and a connecting rod. A through hole is provided on the main shaft of the hub motor body;

[0006] The connecting rod passes through the through hole and is detachably connected to the vehicle frame;

[0007] The hub motor body includes a motor housing. Inside the motor housing, there are a sun gear sleeved around the main shaft, a stator assembly, a rotor assembly, and a planetary gear assembly;

[0008] The sun gear is tightly attached to the outer side wall of the main shaft. A bearing sleeve is provided on the stator assembly, and the bearing sleeve is connected to the outer side wall of the sun gear through a first bearing. The planetary gear assembly is connected to the outer side wall of the sun gear through a second bearing.

[0009] Preferably, the stator assembly includes: a stator sheath sleeved around the outer periphery of the main shaft and a stator;

[0010] The stator sheath is fixedly arranged in the motor housing, and the stator and the planetary gear assembly are fixedly installed on the stator sheath;

[0011] The rotor assembly is arranged between the stator and the main shaft, and the rotor assembly is fixedly connected to the sun gear;

[0012] The bearing sleeve is arranged on the stator sheath.

[0013] Preferably, the planetary gear assembly includes: a planetary carrier sleeved around the outer periphery of the main shaft and a planetary carrier cover plate;

[0014] The planetary carrier is fixedly installed on the stator sheath, and the planetary carrier cover plate is fixedly installed on the planetary carrier;

[0015] A first-stage planetary gear, a second-stage planetary gear and a planetary pin are arranged on the planetary carrier; the second-stage planetary gear is fixedly embedded in the central position of the first-stage planetary gear through a connecting structure, and the second-stage planetary gear is installed on the planetary pin through a roller bearing;

[0016] An end face bearing is arranged between the first-stage planetary gear and the planetary carrier, and the end face bearing is used for bearing the axial force generated by the sun gear and the first-stage planetary gear;

[0017] A bearing installation groove is arranged on one end face of the first-stage planetary gear close to the planetary carrier, and the roller bearing is installed in the bearing installation groove.

[0018] Preferably, the connecting rod is a bolt rod with a threaded portion at one end, and the bolt rod is threadedly connected to the vehicle frame through the threaded portion.

[0019] Preferably, the sun gear includes: a gear portion and an installation portion integrally arranged;

[0020] The outer side wall of one end of the installation portion far from the gear portion is connected to the bearing sleeve through the first bearing, and the outer side wall of one end of the installation portion close to the gear portion is connected to the planetary gear assembly through the second bearing;

[0021] The dimension of the gear portion in the diameter direction is larger than that of the installation portion.

[0022] Preferably, the in-wheel motor further includes a wire harness connector and a wire harness;

[0023] The stator sheath is provided with threading holes for the routing of the wire harness. One end of the wire harness is electrically connected to the wire harness connector, and the other end of the wire harness passes through the threading holes and is electrically connected to the rotor of the rotor assembly.

[0024] The wire harness connector is provided with a first magnetic attraction member, and the first magnetic attraction member is used for attracting and fixing with a second magnetic attraction member on the female connector on the vehicle frame.

[0025] Preferably, the hub motor body is provided with an anti-rotation boss, and the vehicle frame is provided with a vehicle frame groove adapted to be snap-fitted with the anti-rotation boss.

[0026] Preferably, the first magnetic attraction member and the second magnetic attraction member are magnetic steels, and the magnetic steels are arranged on the connection end faces of the wire harness connector and the female connector.

[0027] Preferably, signal line connection terminals are arranged on the connection end face of the wire harness connector, and phase line connection terminals are arranged on the connection end face of the wire harness connector;

[0028] A sealing ring is arranged on the connection end face of the wire harness connector; a friction boss is arranged on the wire harness connector.

[0029] The present invention also provides a vehicle, including the above-mentioned detachable hub motor.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. By arranging a through hole in the main shaft of the hub motor and installing the hub motor on the vehicle by passing a threaded rod through the through hole, the installation of the hub motor at the center of the vehicle frame is ensured. However, this setting method will increase the occupied space of the main shaft, and then reduce the internal effective space between the main shaft and the motor housing, and the motor output torque will be correspondingly reduced. Therefore, in order to ensure that the output torque of the hub motor will not decrease, the installation methods of the sun gear and the bearing are adjusted. The inner ring side wall of the sun gear is tightly connected to the main shaft, and the outer ring side wall of the sun gear is installed in cooperation with the stator sheath through a bearing, so that the pitch circle of the sun gear is reduced and the number of teeth is reduced, thereby increasing the reduction ratio of the motor and then increasing the output torque of the motor.

[0032] 2. In the present invention, the secondary planetary gear is connected to the planetary pin through a needle roller bearing, which reduces the internal bearing, thereby reducing the diameter size of the secondary planetary gear, reducing the pitch circle of the secondary planetary gear, and reducing the number of teeth of the secondary planetary gear, improving the reduction ratio of the motor, and thus increasing the output torque of the motor. However, after the internal bearing is reduced, the force on the secondary planetary gear will increase. Therefore, the secondary gear is made of metal material to meet the strength requirements. Since the needle roller bearing cannot bear axial force, the present invention further provides a thrust bearing between the primary planetary gear and the planetary bracket to bear the axial force generated by the primary planetary gear and the sun gear.

[0033] 3. In the present invention, the stator and the planetary bracket are installed on the stator sheath, the planetary bracket cover is installed on the planetary bracket, and the bearing sleeve is arranged on the stator sheath to ensure the coaxiality among the stator sheath, the stator core, the planetary bracket, the planetary bracket cover and the bearing sleeve.

[0034] 4. The stator sheath of the present invention is provided with wire-passing holes for wiring, making it convenient to route wires inside the stator sheath. The wire-passing holes can be processed into through holes for easy processing and wire passing.

[0035] 5. In the present invention, the hub motor body is fixed to the vehicle frame through threaded rods. The two ends of the threaded rods are directly thread-connected inside the vehicle frame, avoiding protruding structures outside the vehicle. The wire harness connector adopts magnetic attraction connection, with small insertion and extraction resistance, saving time and effort in installation and disassembly, and greatly improving convenience.

[0036] 6. In the present invention, an anti-rotation boss is provided on the hub motor body. When the threaded rod is locked, the anti-rotation boss is stuck in the groove of the vehicle frame, and the hub motor body is completely fixed relative to the vehicle frame, which can transmit torque and achieve the function of assisting.

[0037] 7. In the present invention, a rubber ring and a friction boss are provided on the hub motor body. The rubber ring can ensure good waterproof performance inside the wire harness connector, making it safer to use; the friction boss provides effective friction when disassembling the wire harness connector, facilitating disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0039] Figure 1 It is a schematic three-dimensional structure diagram of a detachable hub motor.

[0040] Figure 2 It is a schematic cross-sectional view of a detachable hub motor;

[0041] Figure 3 It is an assembly schematic diagram of a detachable hub motor and a vehicle frameFigure 1 ;

[0042] Figure 4 Schematic diagram of the assembly of a detachable wheel hub motor and a vehicle frame Figure 2 ;

[0043] Figure 5 Schematic diagram of the structure of a sun gear

[0044] As shown in the figure:

[0045] Wheel hub motor body 1, Rotor 19

[0046] Signal line connection terminal 2, Second bearing 20

[0047] First magnetic attraction part 3, Sun gear 21

[0048] Wire harness connector 4, Gear part 211

[0049] Phase line connection terminal 5, Mounting part 212

[0050] Friction boss 6, First-stage planetary gear 22

[0051] Sealing ring 7, Second-stage planetary gear 23

[0052] Wire harness 8, Roller bearing 24

[0053] Anti-rotation boss 9, Planetary support cover plate 25

[0054] Through hole 10, Internal gear ring 26

[0055] Female connector 11, Planetary pin 27

[0056] Connecting rod 12, Stator 28

[0057] Vehicle frame groove 13, Wire threading hole 29

[0058] Spindle 14, End face bearing 30

[0059] Stator sheath 15, Vehicle frame 31

[0060] Planetary support 16, Motor housing 32

[0061] Bearing sleeve 17, Bearing mounting groove 33

[0062] First bearing 18 Specific implementation method

[0063] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0064] Example 1:

[0065] As Figures 1 - 5 shown, this embodiment provides a detachable hub motor, including: a hub motor body 1 and a connecting rod 12. A through hole 10 is provided on the main shaft 14 of the hub motor body 1; the connecting rod 12 passes through the through hole 10 and is detachably connected to the vehicle frame 31; the hub motor body 1 includes a motor housing 32. Inside the motor housing 32, a sun gear 21 sleeved around the main shaft 14, a stator assembly, a rotor assembly, and a planetary gear assembly are provided; the sun gear 21 is tightly arranged against the outer side wall of the main shaft 14. A bearing sleeve 17 is provided on the stator assembly. The bearing sleeve 17 is connected to the outer side wall of the sun gear 21 through a first bearing 18, and the planetary gear assembly is connected to the outer side wall of the sun gear 21 through a second bearing 20. The connecting rod 12 is a bolt rod with a threaded part at one end. The bolt rod is threadedly connected to the vehicle frame 31 through the threaded part.

[0066] The sun gear 21 includes: a gear part 211 and a mounting part 212 integrally provided; the outer side wall of the end of the mounting part 212 away from the gear part 211 is connected to the bearing sleeve 17 through a first bearing 18, and the outer side wall of the end of the mounting part 212 close to the gear part 211 is connected to the planetary gear assembly through a second bearing 20; the dimension of the gear part 211 in the diameter direction is larger than that of the mounting part 212.

[0067] The stator assembly includes: a stator sheath 15 sleeved around the main shaft 14 and a stator 28; the stator sheath 15 is fixedly arranged inside the motor housing 32, and the stator 28 and the planetary gear assembly are fixedly mounted on the stator sheath 15; the rotor assembly is arranged between the stator 28 and the main shaft 14, and the rotor assembly is fixedly connected to the sun gear 21; the bearing sleeve 17 is arranged on the stator sheath 15.

[0068] The planetary gear assembly includes: a planetary carrier 16 and a planetary carrier cover plate 25 sleeved around the outer periphery of the main shaft 14; the planetary carrier 16 is fixedly installed on the stator sheath 15, and the planetary carrier cover plate 25 is fixedly installed on the planetary carrier 16; the planetary carrier 16 is provided with a first-stage planetary gear 22, a second-stage planetary gear 23 and a planetary pin 27; the second-stage planetary gear 23 is fixedly embedded in the central position of the first-stage planetary gear 22 through a connecting structure, and the second-stage planetary gear 23 is installed on the planetary pin 27 through a roller bearing 24; an end face bearing 30 is arranged between the first-stage planetary gear 22 and the planetary carrier 16, and the end face bearing 30 is used to bear the axial force generated by the sun gear 21 and the first-stage planetary gear 22; a bearing installation groove 33 is arranged on one end face of the first-stage planetary gear 22 close to the planetary carrier 16, and the roller bearing 24 is installed in the bearing installation groove 33.

[0069] The in-wheel motor further includes: a wire harness connector 4 and a wire harness 8; a wire passing hole 29 for the wire harness 8 to pass through is arranged on the stator sheath 15, one end of the wire harness 8 is electrically connected to the wire harness connector 4, and the other end of the wire harness 8 passes through the wire passing hole 29 and is electrically connected to the rotor 19 of the rotor assembly; a first magnetic attracting member 3 is arranged on the wire harness connector 4, and the first magnetic attracting member 3 is used to attract and fix with a second magnetic attracting member on the female connector 11 on the vehicle frame 31. The first magnetic attracting member 3 and the second magnetic attracting member are magnetic steels, and the magnetic steels are arranged on the connecting end faces of the wire harness connector 4 and the female connector 11.

[0070] An anti-rotation boss 9 is arranged on the in-wheel motor body 1, and a vehicle frame groove 13 adapted to be clamped with the anti-rotation boss 9 is arranged on the vehicle frame 31. A signal line connection terminal 2 is arranged on the connecting end face of the wire harness connector 4, and a phase line connection terminal 5 is arranged on the connecting end face of the wire harness connector 4; a sealing ring 7 is arranged on the connecting end face of the wire harness connector 4; a friction boss 6 is arranged on the wire harness connector 4.

[0071] The magnetic steels are arranged in two, and the two magnetic steels are respectively arranged at both ends of the wire harness connector 4. The sealing ring 7 is a rubber ring. Through the magnetic attracting structure composed of the first magnetic attracting member 3 and the second magnetic attracting member, the wire harness connector on the in-wheel motor and the female connector on the vehicle frame can be quickly disassembled and assembled.

[0072] After the first bearing 18 is installed on the outer diameter of the sun gear 21, the structure of the sun gear 21 changes, the gear part 211 is larger than the rear mounting part 212, the processing technology is simple, that is, the gear can be directly rolled out, the whole becomes smaller, and the cost is reduced.

[0073] In order to increase the reduction ratio, the number of teeth of the second-stage planetary gear 23 becomes smaller, the internal bearing is reduced, and a needle roller bearing 24 is adopted. However, after the internal bearing is reduced, the force will increase, so a section bearing is adopted for support. The second-stage planetary gear 23 is press-fitted into the first-stage planetary gear 22.

[0074] To maintain coaxiality, the connection methods and positional relationships of the surrounding components change in sequence as follows: stator sheath 15, stator 28, planetary carrier 16, planetary carrier cover plate 25, bearing sleeve 17.

[0075] In the hub motor body 1 of this embodiment, a through hole 10 is provided in the center of the main shaft 14. When connecting to the vehicle frame, a single threaded rod can be inserted and locked for axial fixation. An anti-rotation boss 9 is provided at the left end of the hub motor body 1 of this embodiment, which can transmit torque and realize the main functions of the hub motor. The wiring harness connection joint 3 is provided with a magnet or a magnet, which can be quickly connected in place during installation, and is provided with a rubber ring for sealing. It can not only ensure that the insertion and extraction force is less than that of a conventional connector, allowing for quick disassembly and assembly, but also has effective waterproof performance.

[0076] In this embodiment, the through hole 10 is provided in the main shaft 14, which will make the volume of the main shaft 14 larger and occupy more space. Compared with traditional motors, the occupied space is relatively large, resulting in a smaller effective space between the main shaft 14 and the motor housing 32. As a result, the motor output torque will be correspondingly reduced. Moreover, in a traditional motor, a hole can be drilled in the axis for threading, while in this embodiment, the axis of the motor is a through shaft, and the threading space is also reduced, so flat wires are used.

[0077] Reduction ratio = number of first-stage planetary gears × number of internal gear rings / (number of sun gear teeth × number of second-stage planetary gear teeth). By reducing the number of sun gear teeth and second-stage planetary gear teeth, the reduction ratio can be effectively increased, thereby increasing the output torque.

[0078] Number of teeth = pitch circle / module. When the module is fixed, reducing the pitch circle can reduce the number of teeth. The larger the bearing diameter, the larger the pitch circle will be.

[0079] In this embodiment, the outer diameter of the sun gear is matched with the bearing, which can increase the reduction ratio and thus increase the output torque. The matching of the outer diameter of the sun gear with the bearing can reduce the pitch circle of the sun gear, thereby reducing the number of teeth of the sun gear, increasing the reduction ratio, and increasing the output torque.

[0080] In this embodiment, the second-stage planetary gear is connected to the planetary pin through a needle bearing, which reduces the internal bearing, thereby reducing the pitch circle of the second-stage planetary gear, reducing the number of teeth of the second-stage planetary gear, increasing the reduction ratio, and increasing the output torque. In fact, while the number of second-stage planetary gears decreases, the number of internal gear rings may also decrease to a certain extent, but the effective tooth ratio of the two can be increased, which can increase the reduction ratio.

[0081] The purpose of this embodiment is to optimize the connection method of the hub motor and the vehicle frame and the connection method of the wiring harness, which can be quickly and effectively completed during actual disassembly and assembly. This embodiment mainly solves the following technical problems:

[0082] a. Optimize the mechanical structure and wiring harness connection between the hub motor and the vehicle, ensuring convenient maintenance, disassembly, and assembly of the motor and the vehicle, with a comfortable and tidy appearance.

[0083] b. Ensure sufficient output torque. Since the mechanical connection of this motor is achieved by a threaded rod passing through the entire motor, the effective internal space will be reduced, and the motor output torque will correspondingly decrease. Compared with conventional motors, in order to ensure that the motor output torque does not decrease under the condition of the same-sized housing, innovative improvements have been made to the overall structural layout inside. The assembly methods of the sun gear and bearings have been adjusted, the installation method of the planetary gear has been adjusted, and the connection methods between various modules have been adjusted, thereby increasing the gear reduction ratio and improving the output torque.

[0084] In this embodiment, the mechanical connection of the hub motor uses a threaded rod passing through the motor and locked on the vehicle frame, and the wiring harness part adopts a magnetic attraction structure. The male plug on the motor is adsorbed on the female plug on the vehicle, optimizing the connection method, enabling quick and effective assembly of the entire hub motor, and at the same time ensuring sufficient output torque of the motor.

[0085] Example 2:

[0086] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0087] This embodiment provides a quickly disassemblable and assemblable hub motor. By optimizing the connection between the hub motor and the vehicle frame and the wiring harness connection method, the efficiency of the hub motor during disassembly and assembly is improved, thereby achieving the purpose of reducing disassembly and assembly costs and being convenient to use. At the same time, the internal structure layout has been innovated to ensure sufficient output torque and abundant power.

[0088] As Figures 1 - 5 shown, the hub motor of this embodiment includes a hub motor body 1, a wiring harness connector 4, and a wiring harness 8; the external features of the hub motor body 1 are a through hole 10 and an anti-rotation boss 9. A threaded rod can be passed through the through hole 10 to fix the hub motor body 1 on the vehicle frame, and the anti-rotation boss 9 can be stuck in the groove of the vehicle frame to transmit torque.

[0089] The wiring harness connector 4 is provided with a signal line connection terminal 2, a magnet, a phase line connection terminal 5, a rubber ring, and a friction boss 6. The signal line connection terminal 2 is used for the signal transmission connection to control the motor; the magnet plays a positioning and adsorption role when the wiring harness connector 4 is connected, enabling quick connection in place; the phase line connection terminal 5 is used to transmit the electrical energy used by the motor; the rubber ring can ensure good waterproofness inside the wiring harness connector 4 and safer use; the friction boss 6 provides effective friction when disassembling the wiring harness connector 4, facilitating disassembly.

[0090] The wire harness 8 belongs to a flexible connection, which can ensure that the wire harness connector 4 has more fixed positions, facilitating the overall vehicle layout.

[0091] During installation, the in-wheel motor body 1 can be directly inserted into the vehicle frame 31 in a certain radial direction. Then, the threaded rod is passed through the through-hole 10 and locked by threads. In the axial direction, the in-wheel motor body 1 is fixed to the vehicle frame 31. At the same time, the anti-rotation boss 9 on the in-wheel motor body 1 is stuck in the vehicle frame groove 13. Therefore, the in-wheel motor body 1 is completely fixed relative to the vehicle frame 31, which can transmit torque and achieve the function of assisting. In addition, since there are magnets on the wire harness connector 4, and there are also magnets on the female connector 11 during connection. The two magnetic poles are opposite, which can not only play a positioning role but also have a large suction force to connect the two connectors together without the need to specifically align them, saving time and effort. After the connection is in place, the signal wire connection terminal 2 and the phase wire connection terminal 5 will also be correspondingly connected, which can achieve signal transmission and electrical energy transmission. The rubber ring on the wire harness connector 4 can ensure good waterproofness inside the wire harness connector 4, making it safer to use.

[0092] During disassembly, the wire harness connector 4 can be unplugged first. Since the main insertion and extraction force depends on the magnetic attraction of the magnets, compared with the traditional interference connection method, this extraction force is much smaller. At the same time, a friction boss 6 is provided on the wire harness connector 4 to provide effective friction, and the wire harness connector 4 can be easily removed. Then, the threaded rod is unscrewed and pulled out, and the in-wheel motor body 1 can be directly separated from the vehicle frame, and the disassembly process can be quickly completed.

[0093] The main components inside the in-wheel motor body 1 include a main shaft 14, a stator sheath 15, a planetary carrier 16, a bearing sleeve 17, a first bearing 18, a rotor 19, a second bearing 20, a sun gear 21, a first-stage planetary gear 22, a second-stage planetary gear 23, a roller bearing 24, a planetary carrier cover plate 25, an internal gear ring 26, a planetary pin 27, a stator 28, a wire passing hole 29, and an end face bearing 30.

[0094] The stator sheath 15 is installed on one side of the main shaft 14 by a key and can transmit the reaction torque of the stator 28 and the gears. The stator 28 and the planetary carrier 16 are locked to the stator sheath 15 by screws. The planetary carrier cover plate 25 is locked to the planetary carrier 16 by screws. At the same time, there are mating relationships between the planetary pin 27 on the planetary carrier cover plate 25 and the planetary carrier 16 and the main shaft 14. With such a setting, the stator sheath 15, the stator 28, the planetary carrier 16, and the planetary carrier cover plate 25 have a fixed positional relationship and coaxiality relative to the main shaft 14, which can meet the operation of the rotor 19 and the gear system.

[0095] As Figure 2As shown, the left end of the sun gear 21 is connected to the bearing sleeve 17 through the first bearing 18. The bearing sleeve 17 is then pressed tightly on the shaft 14. There are two advantages of transferring through the bearing sleeve 17 on the shaft 14: a. It is convenient for wiring inside the stator sheath 15; b. The main shaft 14 does not need to be made very complex, reducing costs. At the same time, the wire passing hole 29 can be processed into a through hole, which is convenient for processing and threading.

[0096] As Figure 2 shown, the right end of the sun gear 21 is connected to the planetary carrier 16 through the second bearing 20. The rotor 19 is pressed tightly in the middle of the sun gear 21, which can effectively transmit power to the sun gear 21. The advantage of connecting the sun gear 21 through the outer diameter to the bearing is that the overall diameter of the sun gear 21 can be made smaller, which is convenient for processing and forming, and reduces costs.

[0097] The planetary gears are composed of a first-stage planetary gear 22 and a second-stage planetary gear 23 pressed together. In this way, the material of the first-stage planetary gear 22 can be plastic, and the material of the second-stage planetary gear 23 can be metal. Because the rotational speed of the first-stage planetary gear 22 is relatively high, using plastic can effectively reduce noise. The second-stage planetary gear 23 bears a greater force, and using metal can effectively meet the strength requirements.

[0098] The inner diameter of the planetary gears is connected to the planetary pin 27 on the planetary carrier 16 through two needle roller bearings 24. Because the diameter of the needle roller bearings is relatively small, the number of teeth of the second-stage planetary gear 23 can be less, so that the overall reduction ratio can be increased. To ensure that under the same volume, the rated power of this motor can still be the same as that of a conventional motor. Using two needle roller bearings 24 can better ensure the coaxiality between the planetary gears and the planetary pin 27, the working noise of the gears will be smaller, and the service life will also be improved. However, since the needle roller bearings 24 cannot bear axial forces, a thrust bearing 30 is provided at the end of the planetary gears to bear the axial forces generated by the sun gear 21 and the first-stage planetary gear 22.

[0099] The tooth part of the internal gear ring 26 meshes with the second-stage planetary gear 23, and the end is connected to the housing, finally transmitting the power to the housing. The tooth part material of the internal gear ring 26 is plastic, which can reduce the noise generated when meshing with the second-stage planetary gear 23. But at the same time, in order to connect the internal gear ring 26 to the housing more effectively, the outside of the internal gear ring 26 is wrapped with metal.

[0100] A through hole is provided in the center of the main shaft 14 of this embodiment. When connecting to the vehicle frame, a single threaded rod can be inserted and locked to achieve axial fixation; an anti-rotation structure is provided at the left end, which can transmit torque and realize the main functions of the hub motor; a magnet is provided on the wire harness connection joint, which can be quickly connected in place during installation, and a rubber ring is provided for sealing. It can not only ensure that the insertion and extraction force is less than that of a conventional connector, allowing for quick disassembly and assembly, but also has effective waterproof performance.

[0101] This embodiment makes innovative improvements to the arrangement of the internal structure, increases the reduction ratio, ensures sufficient output torque, and provides sufficient power, and has the following advantages:

[0102] 1. In this embodiment, a through hole is provided in the center of the hub motor for fixed connection to the vehicle frame, and a stop feature is provided on one side for transmitting torque. A magnet is provided on the wiring harness connector, which can be quickly positioned and connected with the connector at the other end.

[0103] 2. The anti-rotation feature on the hub motor can be an integral part of the body or a separate part, and can be quickly customized for different interfaces.

[0104] 3. The cross-section of the lead wire between the hub motor and the connector can be of any shape to meet various wiring harness requirements.

[0105] 4. A rubber ring can also be provided on the wiring harness connector for waterproof sealing and better protection level.

[0106] 5. The wiring harness directly used between the hub motor body and the wiring harness connector is a soft connection, which can ensure that the wiring harness connector has more fixed positions and facilitate the layout of the entire vehicle.

[0107] 6. The main shaft, stator sleeve, stator, planetary bracket, planetary bracket cover and main shaft are connected in sequence. The stator sleeve, stator, planetary bracket and planetary bracket cover have a fixed position relationship and coaxiality relative to the main shaft, so that a stable frame can be formed to meet the operation of the rotor and gear system in the middle.

[0108] 7. The left end of the sun gear is connected to the bearing sleeve through the first bearing, and the bearing sleeve is pressed onto the main shaft 14. This arrangement is convenient for wiring inside the stator sleeve, and the shaft does not need to be made very complicated. At the same time, the threading hole can be processed into a through hole, which is convenient for processing and threading.

[0109] 8. The outer diameter of the sun gear is connected by a bearing. The advantage is that the overall diameter of the sun gear can be made small, which is convenient for processing and molding, and reduces costs.

[0110] 9. The planetary gear is composed of a first-stage planetary gear and a second-stage planetary gear pressed together. At the same time, the first-stage planetary gear can be made of plastic, and the second-stage planetary gear can be made of metal. Because the first-stage planetary gear has a high speed, the use of plastic can effectively reduce noise. The first-stage planetary gear has a large bearing capacity, and the use of metal can effectively meet the strength requirements.

[0111] 10. The inner diameter of the planetary gear is connected to the planetary pin on the planetary carrier through two roller bearings. Since the diameter of the needle roller bearing is small, the number of teeth of the secondary planetary gear can be reduced, so that the overall reduction ratio can be increased, ensuring that the rated power of this motor relative to the conventional motor can remain the same under the same volume. Using two needle roller bearings can better ensure the coaxiality between the planetary gear and the planetary pin, with less gear working noise and increased lifespan.

[0112] 11. Since the needle roller bearing cannot bear axial force, a thrust bearing is provided at the end of the planetary gear to bear the axial force generated by the sun gear and the primary planetary gear. To save axial space, the thrust bearing is designed inside the primary planetary gear.

[0113] 12. The tooth part material of the internal gear ring is plastic, which can reduce the noise generated when meshing with the secondary planetary gear. But at the same time, in order to connect the internal gear ring and the housing more effectively, the outside of the internal gear ring is wrapped with metal.

[0114] In the present invention, by providing a through hole in the motor main shaft and installing the motor on the vehicle by passing a threaded rod through the through hole, it is ensured that the motor is installed at the center of the vehicle frame. At the same time, in order to ensure that the output torque of the motor will not decrease after such setting, the installation methods of the sun gear and the bearing are adjusted, increasing the reduction ratio and thus increasing the output torque.

[0115] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0116] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A detachable wheel hub motor, characterized in that: include: A wheel hub motor body (1) and a connecting rod (12), wherein a main shaft (14) of the wheel hub motor body (1) is provided with a through hole (10); The connecting rod (12) passes through the through hole (10) and is detachably connected to the vehicle frame (31); The wheel hub motor body (1) comprises a motor housing (32), wherein a sun gear (21) sleeved on the periphery of the main shaft (14), a stator assembly, a rotor assembly and a planetary gear assembly are arranged in the motor housing (32); The sun gear (21) is arranged closely against the outer wall of the main shaft (14); a bearing sleeve (17) is arranged on the stator assembly; the bearing sleeve (17) is connected to the outer wall of the sun gear (21) via a first bearing (18); and the planetary gear assembly is connected to the outer wall of the sun gear (21) via a second bearing (20).

2. The detachable hub motor according to claim 1, characterized in that: The stator assembly comprises: a stator sleeve (15) sleeved on the periphery of the main shaft (14) and a stator (28); The stator sleeve (15) is fixedly arranged in the motor housing (32), and the stator (28) and the planetary gear assembly are fixedly mounted on the stator sleeve (15); The rotor assembly is arranged between the stator (28) and the main shaft (14), and the rotor assembly is fixedly connected to the sun gear (21); The bearing sleeve (17) is arranged on the stator sleeve (15).

3. The detachable hub motor according to claim 2, characterized in that: The planetary gear assembly comprises: a planetary support (16) sleeved on the periphery of the main shaft (14) and a planetary support cover plate (25); The planetary support (16) is fixedly mounted on the stator sleeve (15), and the planetary support cover plate (25) is fixedly mounted on the planetary support (16); The planetary support (16) is provided with a primary planetary gear (22), a secondary planetary gear (23) and a planetary pin (27); the secondary planetary gear (23) is fixedly embedded in the center position of the primary planetary gear (22) through a connecting structure, and the secondary planetary gear (23) is mounted on the planetary pin (27) through a roller bearing (24); An end bearing (30) is provided between the first-stage planetary gear (22) and the planetary support (16), and the end bearing (30) is used to bear the axial force generated by the sun gear (21) and the first-stage planetary gear (22); A bearing mounting groove (33) is provided on an end surface of the first-stage planetary gear (22) close to the planetary bracket (16), and the roller bearing (24) is installed in the bearing mounting groove (33).

4. The detachable hub motor according to claim 3, characterized in that: The connecting rod (12) is a bolt rod with a threaded portion at one end, and the bolt rod is threadedly connected to the vehicle frame (31) via the threaded portion.

5. The detachable hub motor according to claim 1, characterized in that: The sun gear (21) comprises: a gear portion (211) and a mounting portion (212) which are integrally arranged; An outer wall of an end of the mounting portion (212) away from the gear portion (211) is connected to the bearing sleeve (17) via the first bearing (18), and an outer wall of an end of the mounting portion (212) close to the gear portion (211) is connected to the planetary gear assembly via the second bearing (20); The gear portion (211) has a larger diameter than the mounting portion (212).

6. The detachable hub motor according to claim 2, characterized in that: The wheel hub motor also includes: a wiring harness connector (4) and a wiring harness (8); The stator sheath (15) is provided with a threading hole (29) for routing the wiring harness (8); one end of the wiring harness (8) is electrically connected to the wiring harness connector (4); and the other end of the wiring harness (8) passes through the threading hole (29) and is electrically connected to the rotor (19) of the rotor assembly; The wiring harness connector (4) is provided with a first magnetic attraction component (3), and the first magnetic attraction component (3) is used to be attracted and fixed to a second magnetic attraction component on a female connector (11) on a vehicle frame (31).

7. The detachable hub motor according to claim 6, characterized in that: The wheel hub motor body (1) is provided with an anti-rotation boss (9), and the vehicle frame (31) is provided with a frame groove (13) adapted to be engaged with the anti-rotation boss (9).

8. The detachable hub motor according to claim 6, characterized in that: The first magnetic attraction member (3) and the second magnetic attraction member are magnetic steels, and the magnetic steels are arranged on the connecting end surfaces of the wiring harness connector (4) and the female connector (11).

9. The detachable hub motor according to claim 6, characterized in that: A signal line connection terminal (2) is provided on the connection end surface of the wiring harness connector (4), and a phase line connection terminal (5) is provided on the connection end surface of the wiring harness connector (4); A sealing ring (7) is provided on the connection end surface of the wiring harness connector (4); and a friction boss (6) is provided on the wiring harness connector (4).

10. A vehicle, characterized in that: It comprises the detachable hub motor as described in any one of claims 1 to 9.

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