Hub motor driving system and vehicle

Abstract

The invention discloses a hub motor driving system and a vehicle. The hub motor driving system comprises a driving module, a rim mounting flange and a brake mechanism. The driving module comprises a driving motor and a planetary reducing mechanism which are in transmission connection, and the driving motor is an axial motor; the planetary speed reducing mechanism is arranged on one side of the driving motor in the axial direction; the rim mounting flange is arranged on one side of the driving module in the axial direction and is in transmission connection with the output end of the planetary speed reducing mechanism, and the side, away from the driving module, of the rim mounting flange is used for being connected with a rim; the brake mechanism comprises a brake disc and brake calipers, the brake disc is arranged on the side, facing the rim, of the driving module in the axial direction and fixedly connected with the rim mounting flange, the brake calipers are fixedly connected with the driving module and used for clamping or loosening the brake disc, and the brake calipers and the driving module are at least partially overlapped in the axial direction. In this way, the structural layout is reasonable, the size of a driving system is small, and the braking performance of a braking system is guaranteed.

Description

Technical Field

[0001] The present application belongs to the technical field of hub motors, and specifically relates to a hub motor drive system and a vehicle. Background Art

[0002] More and more new energy vehicles such as electric vehicles are beginning to use in-wheel motor drive systems, which have the advantages of short torque transmission path, low power loss and high efficiency.

[0003] Existing in-wheel motor drive systems integrate the motor, reducer, and wheel brake mechanism. However, the existing in-wheel motor drive system architecture is not rationally designed, resulting in excessive size of the entire in-wheel electric drive system and poor brake system performance. This in turn has an adverse impact on the size of the wheels of the in-wheel electric drive system, the structural layout of the vehicle, and the braking performance of the brake system. Summary of the Invention

[0004] The present application provides a hub motor drive system and a vehicle with a reasonable structural layout, which reduces the size of the drive system while ensuring the braking performance of the brake system.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a hub motor drive system, including a drive module, a rim mounting flange and a braking mechanism, the drive module including a drive motor and a planetary reduction mechanism, the drive motor including a stator module and a rotor module distributed along the axial direction; the planetary reduction mechanism is arranged on one side of the drive motor along the axial direction, and the input end of the planetary reduction mechanism is transmission-connected to the rotor module; the rim mounting flange is arranged on one side of the drive module along the axial direction and is transmission-connected to the output end of the planetary reduction mechanism, and the side of the rim mounting flange away from the drive module is used for connection to the rim; the braking mechanism includes a brake disc and a brake caliper, the brake disc is arranged on the side of the drive module facing the rim along the axial direction and is fixedly connected to the rim mounting flange, the brake caliper is fixedly connected to the drive module for clamping or releasing the brake disc, and the brake caliper at least partially overlaps with the drive module in the axial direction.

[0006] Wherein, the planetary reduction mechanism is arranged between the drive motor and the rim mounting flange along the axial direction.

[0007] In which, the hub motor drive system also includes a central shaft, which is axially arranged in the drive module, and a hub bearing is provided outside the central shaft. The outer ring of the hub bearing is connected to the output end of the planetary reduction mechanism, and the outer ring of the hub bearing is fixedly connected to the rim mounting flange. A bearing mounting cavity is provided outside the central shaft, and the hub bearing is arranged in the bearing mounting cavity; the planetary reduction mechanism includes a shell, and a reduction cavity is provided in the shell. The reduction cavity is connected to the bearing mounting cavity and is sealed and isolated from the drive motor.

[0008] The motor comprises a casing, a motor shaft, two sealing plates, a stator module and two rotor modules, the casing comprises a side plate and two end covers respectively connected to both sides of the side plate along the axial direction, the side plate and the two end covers together form a accommodating cavity; the motor shaft rotatably passes through the casing along the axial direction; two sealing plates are distributed along the axial direction and arranged in the accommodating cavity, the two sealing plates and the side plates together form a closed stator accommodating cavity, the stator accommodating cavity is arranged around the motor shaft, one sealing plate and a corresponding end cover together form a rotor accommodating cavity; the stator module is arranged in the stator accommodating cavity, and the stator module comprises a plurality of stator assemblies arranged at intervals along the circumferential direction, The stator assembly includes a stator core and a stator coil arranged around the stator core. An outer cavity is formed between the outer periphery of the stator assembly and the side plate, and an inner cavity is formed between the inner periphery of the stator assembly and the sealing plate. The outer cavity is connected to the inner cavity. The stator assembly is fixedly connected to the side plate via a first partition plate. The first partition plate divides the outer cavity into two sub-cavities distributed along the circumferential direction. An oil inlet and an oil outlet are provided on the casing. The oil inlet and the oil outlet are respectively connected to the two sub-cavities; two rotor modules are respectively arranged on both sides of the stator module along the axial direction and are rotatably arranged in the rotor accommodating cavity. The rotor module is fixedly connected to the motor shaft.

[0009] The stator module further includes a second partition plate, which is radially connected between the side plate and the sealing plate. The second partition plate divides the stator accommodating cavity into two cavities distributed along the axial direction.

[0010] The sealing plate includes a sealing inner plate and a sealing side plate. The sealing inner plate is annular and surrounds the outside of the motor shaft. The inner periphery of the sealing side plate is connected to the outer periphery of the sealing inner plate. A sealing groove is provided on the outer periphery of the sealing side plate. A sealing ring is provided in the sealing groove. The sealing ring is pressed between the sealing groove and the side plate.

[0011] In which, the sealing side plate includes a first sealing side plate, a second sealing side plate and a connecting plate, the inner periphery of the first sealing side plate is connected to the outer periphery of the sealing inner plate, the second sealing side plate is arranged on the side of the first sealing side plate away from the stator module, the outer periphery of the second sealing side plate is provided with the sealing groove, the inner periphery of the second sealing side plate is connected to the outer periphery of the first sealing side plate through the connecting plate, the connecting plate is spaced apart from the side plate, and the connecting plate ring is arranged outside the rotor module.

[0012] Among them, the rotor module includes a rotor frame and a magnet. The rotor frame is fixedly connected to the motor shaft. The magnet is arranged on the side of the rotor frame facing the stator assembly. Multiple magnets are arranged at intervals along the circumferential direction. The side of the rotor frame facing away from the magnet is protruded with multiple fins.

[0013] The rotor frame is provided with a plurality of heat dissipation holes, which penetrate the rotor frame axially. The heat dissipation holes are arranged between two adjacent magnetic steels, and the plurality of heat dissipation holes between two adjacent magnetic steels are staggered in the radial direction.

[0014] In order to solve the above technical problems, another technical solution adopted in this application is: to provide a vehicle, including the hub motor drive system described in any technical solution.

[0015] Different from the existing technical situation, the beneficial effect of the present application is that the drive module of the hub motor drive system 1 of the present application is arranged close to the inner side of the vehicle, while the braking mechanism is arranged close to the outer side of the vehicle, that is, one side of the rim. The heat generated by the braking mechanism during braking can be quickly discharged from the vehicle from the side of the rim, thereby ensuring the braking performance and reliability of the braking mechanism. In addition, since part of the braking mechanism is radially arranged outside the drive module, the radial space of the drive module is utilized, thereby reducing the axial size of the hub motor drive system, freeing up the vehicle chassis space, and optimizing the vehicle layout. At the same time, the hub motor drive system of the present application uses an axial flux motor as a drive motor, which can generate greater power and torque in a smaller size and adapt to the narrow space inside the rim. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort, among which:

[0017] Figure 1 This is a structural diagram of an embodiment of the in-wheel motor drive system of the present application;

[0018] Figure 2 is a cross-sectional schematic diagram of an embodiment of the in-wheel motor drive system of the present application;

[0019] Figure 3 This application Figure 2 A partial enlarged schematic diagram;

[0020] Figure 4 This is a schematic structural diagram of an embodiment of a drive motor of the present application;

[0021] Figure 5 This is a schematic structural diagram of an embodiment of the interior of a housing of the present application;

[0022] Figure 6 is a cross-sectional schematic diagram of an embodiment of a stator accommodating cavity of the present application;

[0023] Figure 7 This is a structural diagram of an embodiment of a sealing plate of the present application;

[0024] Figure 8 This is a structural diagram of an embodiment of a rotor module of the present application.

[0025] Reference numerals: 1. in-wheel motor drive system; 10. drive motor; 11. housing; 110. accommodating chamber; 1101. outer chamber; 11011. sub-chamber; 1102. spacing channel; 1103. inner chamber; 111. side plate; 1111. mounting groove; 112. end cover; 1121. center hole; 11a. oil inlet; 11b. oil outlet; 12. motor shaft; 13. sealing plate; 13a. stator accommodating chamber; 13b. rotor accommodating chamber; 131. sealing inner plate; 132. sealing side plate; 1321. first sealing side plate; 1322. second sealing side plate; 1323. connecting plate; 133. sealing groove; 134. sealing ring; 14. stator module; 141. Stator assembly; 1411. Stator core; 1412. Stator coil; 142. First partition; 143. Second partition; 15. Rotor module; 151. Rotor frame; 1511. Heat dissipation holes; 152. Magnet; 153. Fins; 20. Planetary reduction mechanism; 21. Sun gear; 22. Planetary gear; 23. Planetary frame; 24. Housing; 240. Reduction chamber; 30. Rim mounting flange; 31. Hub bearing; 310. Bearing mounting chamber; 40. Braking mechanism; 41. Brake disc; 42. Brake caliper; 50. Center shaft; 51. First seal; 52. Second seal; 53. Third seal; 54. Fourth seal; 60. Steering knuckle bracket. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] See also Figure 1 , Figure 1 This is a structural diagram of an embodiment of the wheel hub motor drive system of the present application. Figure 2 The figure is a cross-sectional schematic diagram of an embodiment of the in-wheel motor drive system of the present application. The in-wheel motor drive system 1 includes a drive module (not shown), a rim mounting flange 30, and a brake mechanism 40. The drive module includes a drive motor 10 and a planetary reduction mechanism 20. The drive motor 10 includes an axially distributed stator module 14 and a rotor module 15. That is, the drive motor 10 of the present application is an axial flux motor. The rotor module 15 of the drive motor 10 is connected to the motor shaft 12, which serves as the output end of the drive motor 10.

[0028] The planetary reduction mechanism 20 is axially arranged on one side of the drive motor 10, and the input end of the planetary reduction mechanism 20 is transmission-connected to the rotor module. Specifically, the planetary reduction mechanism 20 includes a housing 24, and a reduction chamber 240 is provided in the housing 24. The planetary reduction mechanism 20 also includes a sun gear 21 provided in the reduction chamber 240 and a plurality of planetary gears 22 surrounding the sun gear 21. The plurality of planetary gears 22 are rotatably provided on the planetary carrier 23. The sun gear 21 is connected to the motor shaft as the input end of the planetary reduction mechanism 20, and the planetary carrier 23 is the output end of the planetary reduction mechanism 20, which reduces speed relative to the sun gear 21 and increases torque. It should be noted that when the drive system is used as the main drive, the planetary reduction mechanism 20 is always connected to the drive motor 10, and in the auxiliary drive case, there is a mechanism for disengaging and combining the planetary reduction mechanism 20 with the drive motor 10 as needed.

[0029] The rim mounting flange 30 is axially arranged on one side of the driving module and is transmission-connected to the output end of the planetary reduction mechanism 20. The side of the rim mounting flange 30 facing away from the driving module is used to connect to the rim (not shown). The rim mounting flange 30 is used to drive the rim to rotate.

[0030] The brake mechanism 40 includes a brake disc 41 and a brake caliper. The brake disc 41 is axially mounted on the side of the drive module facing the wheel rim and is fixedly connected to the wheel rim mounting flange 30. The brake caliper is fixedly connected to the drive module and is used to clamp or release the brake disc 41. The brake caliper 42 at least partially overlaps the drive module in the axial direction. Specifically, the brake mechanism 40 can be an electrically controlled hydraulic brake. The brake disc 41 is mounted outside the wheel rim mounting flange 30, and the brake caliper 42 is fixed outside the drive module and clamped to the edge of the brake disc 41.

[0031] like Figure 2 As shown, the drive module of the hub motor drive system 1 of the present application is arranged close to the inside of the vehicle (the left side in the figure), while the brake mechanism 40 is arranged close to the outside of the vehicle, that is, the side of the rim (the right side in the figure). The heat generated by the brake mechanism 40 during braking can be quickly discharged from the vehicle from the side of the rim, thereby ensuring the braking performance and reliability of the brake mechanism 40. In addition, since part of the brake mechanism 40 is radially arranged outside the drive module, the radial space of the drive module is utilized, thereby reducing the axial size of the hub motor drive system 1, freeing up the vehicle chassis space, and optimizing the vehicle layout. At the same time, the hub motor drive system 1 of the present application uses an axial flux motor as the drive motor 10, which can generate greater power and torque in a smaller size and adapt to the narrow space inside the rim.

[0032] In one embodiment, the planetary reduction mechanism 20 is axially arranged between the drive motor 10 and the rim mounting flange 30. That is, in the direction from the inside of the vehicle to the outside of the vehicle, the drive motor 10, the planetary reduction mechanism 20, and the brake disc 41 are arranged in sequence. Since the radial size of the planetary reduction mechanism 20 is generally smaller than that of the drive motor 10, the space outside the planetary reduction mechanism 20 can be used to install other structures of the brake mechanism 40 in addition to the brake disc 41, which can further improve space utilization. In other embodiments, the axial positions of the drive motor 10 and the planetary reduction mechanism 20 can also be exchanged, that is, in the direction from the inside of the vehicle to the outside of the vehicle, the planetary reduction mechanism 20, the drive motor 10, and the brake disc 41 are arranged in sequence.

[0033] See Figure 2 and Figure 3 , Figure 3 This application Figure 2A partially enlarged schematic diagram. The hub motor drive system 1 also includes a central shaft 50, which is axially inserted into the drive module. Specifically, the central shaft 50 is inserted into the motor shaft 12, and the end of the central shaft 50 away from the rim is fixedly connected to the steering knuckle bracket 60. A hub bearing 31 is provided on the outer sleeve of the central shaft 50, and the outer ring of the hub bearing 31 is connected to the planetary carrier 23 of the planetary reduction mechanism 20, and the outer ring of the hub bearing 31 is fixedly connected to the rim mounting flange 30. A bearing mounting cavity 310 is provided on the outside of the central shaft 50, and the hub bearing 31 is arranged in the bearing mounting cavity 310. The planetary reduction mechanism 20 includes a housing 24, and a reduction cavity 240 is provided in the housing 24. The reduction cavity 240 is connected to the bearing mounting cavity 310 and is sealed and isolated from the drive motor 10. Specifically, the drive motor 10 includes a housing 11 having an accommodating chamber 110 therein. The housing 11 is integrally formed with the outer shell 24 of the planetary reduction mechanism 20. A first seal 51 seals the accommodating chamber 110 from the reduction chamber 240. A second seal 52 is disposed on the side of the hub bearing 31 away from the rim mounting flange 30 and between the central axis 50 and the motor shaft 12. A third seal 53 is disposed between the outer shell 24 and the outer ring of the hub bearing 31. A fourth seal 54 is disposed on the rim mounting flange 30. The first, second, third, and fourth seals 51, 52, 53, and 54 seal the cavity between the drive motor 10 and the planetary reduction mechanism 20, while connecting the reduction chamber 240 to the bearing mounting cavity 310 to form a single, closed cavity. This allows the reduction mechanism and the hub bearing 31 to share lubricating oil cooling.

[0034] The torque transmission order of this embodiment is as follows: the motor shaft 12 is output to the sun gear 21 of the planetary reduction mechanism 20, and after being decelerated and torque-increased by the planetary reduction mechanism 20, it is output to the outer ring of the hub bearing 31. The outer ring of the hub bearing 31 is fixed to the rim mounting flange 30, and the brake disc 41, the rim, and the tire (not shown) are driven to rotate by the bolts on the rim mounting flange 30.

[0035] In other embodiments, the outer ring of the hub bearing 31 can be fixed to the housing 11 and the steering knuckle bracket 60, while the central shaft 50 is fixed to the rim mounting flange 30, driving the brake disc 41 and the rim to rotate. The torque transmission sequence is as follows: the motor shaft 12 outputs torque to the sun gear 21 of the planetary reducer. After torque is reduced and increased by the planetary reduction mechanism 20, it is output to the central shaft 50. The central shaft 50 is fixed to the rim mounting flange 30, and the bolts on the rim mounting flange 30 drive the rotation of the brake disc 41, the rim, and the tire (not shown).

[0036] In one embodiment, the drive motor 10 can be a motor with two rotors and a single stator, or a motor with a single rotor and a single stator. This application takes the motor with two rotors and a single stator as an example, which includes a housing 11, a motor shaft 12, two sealing plates 13, a stator module 14 and two rotor modules 15. The housing 11 includes a side plate 111 and two end covers 112 axially connected to both sides of the side plate 111. The side plate 111 and the two end covers 112 together form a receiving cavity 110; the motor shaft 12 can rotatably pass through the housing 11 along the axial direction. Specifically, the side plate 111 is cylindrical, and the two end covers 112 are circular and detachably connected to the two ends of the side plate 111 by bolts, thereby forming a hollow cylindrical housing 11. The end cover 112 on the side close to the planetary reduction mechanism 20 extends outward to form a part of the outer shell 24. A center hole 1121 is axially provided at the center of the end cover 112, and the center hole 1121 passes through the inner and outer sides of the casing 11. The motor shaft 12 is axially arranged in the center hole 1121, and the motor shaft 12 extends axially into the deceleration chamber 240. The motor shaft 12 is rotatably connected to the center hole 1121 through a bearing.

[0037] See Figure 4 Two sealing plates 13 are provided, and the two sealing plates 13 are axially symmetrically arranged within the accommodating chamber 110. The two sealing plates 13 and the side plates 111 together form a closed stator accommodating chamber 13a, which surrounds the motor shaft 12. The two sealing plates 13 and the two end covers 112 respectively form two rotor accommodating chambers 13b. Specifically, the stator accommodating chamber 13a is axially located in the middle of the accommodating chamber 110, and the two rotor accommodating chambers 13b are axially symmetrically arranged on both sides of the stator accommodating chamber 13a.

[0038] See Figure 5The stator module 14 is disposed within the stator accommodating cavity 13a. The stator module 14 includes a plurality of stator assemblies 141 spaced apart along the circumferential direction. The stator assemblies 141 include a stator core 1411 and a stator coil 1412 disposed around the stator core 1411. Specifically, the stator core 1411 and the stator coil 1412 in each stator assembly 141 are fixed by potting compound, and the plurality of stator assemblies 141 are uniformly spaced along the circumferential direction. An outer cavity 1101 is formed between the outer periphery of the stator assembly 141 and the side plate 111, and an inner cavity 1103 is formed between the inner periphery of the stator assembly 141 and the sealing plate 13. The outer cavity 1101 is in communication with the inner cavity 1103. Specifically, the stator assembly 141 is radially disposed in the middle of the stator accommodating cavity 13a, resulting in a cavity surrounding the outer side of the stator assembly 141. An inner cavity 1103 is provided around the inner side of the stator assembly 141. The outer cavity 1101 communicates with the inner cavity 1103 via a spacing channel 1102 between two adjacent stator assemblies 141. Since there are multiple stator assemblies 141, the outer cavity 1101 communicates with the inner cavity 1103 via multiple spacing channels 1102. The stator assembly 141 is fixedly connected to the side plate 111 via a first partition 142. The first partition 142 divides the outer cavity 1101 into two circumferentially distributed sub-cavities 11011. The housing 11 is provided with an oil inlet 11a and an oil outlet 11b, which respectively communicate with the two sub-cavities 11011. Specifically, there are two first partitions 142, both of which are arranged radially and spaced apart along the circumferential direction. The outer end of each first partition 142 is connected to the inner wall of the side plate 111, and the inner end of the first partition 142 is connected to the stator assembly 141.

[0039] The rotor module 15 is rotatably mounted within the rotor accommodating cavity 13b. The rotor module 15 is axially positioned on one side of the stator module 14 and is fixedly connected to the motor shaft 12. Two sets of rotor modules 15 are provided, one in each rotor accommodating cavity 13b and symmetrically positioned on either side of the stator module 14 along the axial direction.

[0040] The driving motor 10 of the present application is provided with a sealing plate 13 between the stator module 14 and the rotor module 15, which is used to separate the accommodating chamber 110 in the driving motor 10 into a stator accommodating chamber 13a and a rotor accommodating chamber 13b, wherein the stator accommodating chamber 13a is a sealed chamber. The sealed chamber is used to accommodate the stator module 14. At the same time, the area of ​​the sealed chamber other than the stator module 14 can be used to form a cooling oil channel, which can cool the stator module 14. The cooling oil channel of the present application includes an outer cavity 1101, an inner cavity 1103, and a spacing channel 1102 connecting the outer cavity 1101 and the inner cavity 1103, and the present application provides a first partition plate 142 to separate the outer cavity 1101 into two sub-cavities 11011, and connect the oil inlet 11a and the oil outlet 11b to the two sub-cavities 11011 respectively. Specifically, refer to Figure 4 In the direction indicated by the arrow, the coolant can enter a sub-cavity 11011 above the outer cavity 1101 from the oil inlet 11a on the side of the casing 11, and the coolant can flow circumferentially in the sub-cavity 11011, and then flow into the inner cavity 1103 from the multiple spacing channels 1102 (connected to the upper sub-cavity 11011) between the two adjacent stator assemblies 141 under the action of gravity. The coolant can flow circumferentially in the inner cavity 1103, and under the action of gravity, the coolant flows from the multiple spacing channels 1102 (connected to the lower sub-cavity 11011) into the lower sub-cavity 11011, and flows circumferentially in the sub-cavity 11011, and finally flows out of the casing 11 from the bottom oil outlet 11b. Since the present application separates the cooling channels in the drive motor 10, it can balance the pressure in the stator accommodating cavity 13a and allow the coolant to flow through more positions in the stator accommodating cavity 13a, so that more coolant can participate in the circulation, reducing the amount of dead oil, and achieving cooling of multiple stator coils 1412, thereby making the temperature distribution of multiple stator coils 1412 uniform, ensuring the cooling effect while improving the reliability of the drive motor 10.

[0041] Optionally, the first partition 142 can be made of potting compound, allowing it to be prepared and formed simultaneously with the potting of the stator assembly 141. The potting compound can include a thermally conductive material, which can quickly dissipate the temperature of the coil while securing the stator assembly 141 to the housing 11. Specifically, the potting compound can be a high-performance epoxy impregnating resin, comprising two components, A and B. Component A is an epoxy resin component, formulated from high-purity epoxy resin, thermally conductive fillers, and other materials; Component B is a curing agent, thermally conductive fillers, and other materials.

[0042] Furthermore, the two sub-cavities 11011 are arranged symmetrically along the radial direction. This arrangement makes the two sub-cavities 11011 have the same volume and shape, further balancing the pressure in the stator accommodating cavity 13a, thereby making the temperature distribution of the multiple stator coils 1412 more uniform.

[0043] Further, see Figure 6 and combined Figure 5 , Figure 6 It is a cross-sectional schematic diagram of an embodiment of the stator accommodating cavity of the present application. In some embodiments, the stator module 14 also includes a second partition 143, which is radially connected between the side plate 111 and the sealing plate 13, and the second partition 143 divides the stator accommodating cavity 13a into two cavities distributed along the axial direction. Specifically, the second partition 143 radially fills the outer cavity 1101, the inner cavity 1103 and the spacing channel 1102. The cavities on the left and right sides correspond to the two rotor accommodating cavities 13b respectively. The second partition 143 further separates the two sub-cavities 11011 of the outer cavity 1101 axially to form four smaller cavities, and the inner cavity 1103 is axially separated to form two small cavities. The provision of the second partition 143 further increases the fixing strength between the stator module 14 and the casing 11, while further dividing the stator accommodating cavity 13a into more cavities, further balancing the pressure in the stator accommodating cavity 13a, and making the cooling oil channel more unobstructed, reducing dead oil that does not participate in the circulation, thereby making the temperature distribution of the multiple stator coils 1412 more uniform, ensuring the cooling effect while improving the reliability of the drive motor 10.

[0044] Optionally, the second partition 143 can be made of potting compound, allowing it to be prepared and formed simultaneously with the potting of the stator assembly 141. Specifically, the stator core 1411 can be positioned using a mold before potting. The mold clamping pressure aligns the planes of the stator core 1411, thereby improving the positioning accuracy of the stator core 1411 in the drive motor 10. The second partition 143 can be made of the same material as the first partition 142. While securing the stator assembly 141 to the housing 11, it can also quickly dissipate the temperature of the coil.

[0045] Furthermore, the cavities on both sides of the second partition 143 are symmetrically arranged along the axial direction. The above arrangement makes the two cavities in the axial direction identical, further balancing the pressure in the stator accommodating cavity 13a, thereby making the temperature distribution of the multiple stator coils 1412 more uniform.

[0046] See Figure 6 and combined Figure 7 , Figure 7It is a structural diagram of an embodiment of a sealing plate of the present application. The sealing plate 13 includes a sealing inner plate 131 and a sealing side plate 132. The sealing inner plate 131 is annular and surrounds the outside of the motor shaft 12. Specifically, in this embodiment, after the two sealing inner plates 131 are aligned, a through hole is formed in the center of the sealing plate 13 for passing the motor shaft 12. Specifically, after the end faces of the two sealing inner plates 131 are aligned, they can be fixed together by bonding or welding. The inner periphery of the sealing side plate 132 is connected to the outer periphery of the sealing inner plate 131, and the outer periphery of the sealing side plate 132 is provided with a sealing groove 133, the opening of the sealing groove 133 faces the side plate 111, and a sealing ring 134 is provided in the sealing groove 133, and the sealing ring 134 is pressed between the sealing groove 133 and the side plate 111. The sealing side plates 132 serve to axially separate the stator accommodating chamber 13a from the rotor accommodating chamber 13b. The two sealing side plates 132, the two sealing inner plates 131, and the side plate 111 together enclose the stator accommodating chamber 13a. The sealing side plates 132 also provide a radial seal with the side plate 111. Specifically, mounting grooves 1111 are provided at both ends of the inner wall of the side plate 111. Sealing rings 134 and sealing grooves 133 are positioned within these grooves. After the end cap 112 is secured to the side plate 111, the sealing rings 134 and sealing grooves 133 are compressed within these grooves.

[0047] Optionally, the inner side of the sealing side plate 132 can be fixedly connected to the stator module 14, specifically by bonding or the like. The above arrangement, on the one hand, enables the stator module 14 to be further fixed in the casing 11. On the other hand, since the sealing side plate 132 is fixed, it can prevent the sealing side plate 132 from bulging toward the rotor module 15 due to excessive pressure in the stator accommodating cavity 13a, thereby avoiding interference with the rotor module 15.

[0048] Optionally, continue to Figure 6 and Figure 7In some embodiments, the sealing side plate 132 includes a first sealing side plate 1321, a second sealing side plate 1322 and a connecting plate 1323. The inner periphery of the first sealing side plate 1321 is connected to the outer periphery of the sealing inner plate 131. The second sealing side plate 1322 is arranged on the side of the first sealing side plate 1321 away from the stator module 14. The outer periphery of the second sealing side plate 1322 is provided with a sealing groove 133. The inner periphery of the second sealing side plate 1322 is connected to the outer periphery of the first sealing side plate 1321 through the connecting plate 1323. The connecting plate 1323 is spaced apart from the side plate 111 and is arranged outside the rotor module 15. In this embodiment, the first sealing side plate 1321, the connecting plate 1323 and the second sealing side plate 1322 form a step structure, so that the space between the second sealing side plate 1322 and the side plate 111 also becomes part of the outer cavity 1101, thereby increasing the storage space for the coolant. Since the drive motor 10 can store more coolant, the specific heat capacity of the drive motor 10 in a limited space is increased, thereby improving the cooling effect.

[0049] In other embodiments, the sealing side plate 132 may also only include the second sealing side plate 1322 , and the second sealing side plate 1322 directly extends toward the side plate 111 and seals therewith.

[0050] See Figure 8 and combined Figure 4 , Figure 8It is a structural schematic diagram of an embodiment of the rotor module of the present application. The rotor module 15 includes a rotor frame 151 and a magnet 152. The rotor frame 151 is fixedly connected to the motor shaft 12. The rotor frame 151 is disc-shaped, and a through hole is provided in the center of the rotor frame 151. The motor shaft 12 is passed through the through hole and fixed to the through hole, so that the rotor frame 151 can drive the motor shaft 12 to rotate synchronously. The magnet 152 is arranged on the side of the rotor frame 151 facing the stator assembly 141. A plurality of magnets 152 are arranged at intervals along the circumferential direction, and a plurality of fins 153 are protruding from the side of the rotor frame 151 away from the magnet 152. The magnet 152 is arranged relative to the stator core 1411. It should be noted that since a sealing plate 13 is provided between the magnet 152 and the stator core 1411, in order to ensure the normal operation of the drive motor 10, the sealing plate 13 should be made of a non-magnetic material, such as plastic. The fins 153 are arranged on the back side of the rotor frame 151, that is, the fins 153 and the magnets 152 are respectively arranged on opposite sides of the rotor frame 151. Specifically, in this embodiment, a plurality of fins 153 are arranged corresponding to each magnet 152, and the fins 153 extend radially. The rotor frame 151 of the present application is provided with a plurality of fins 153 on one side. The provision of the fins 153 increases the surface area of ​​the rotor frame 151 and the heat dissipation area, thereby improving the heat dissipation effect of the rotor module 15. At the same time, when the rotor frame 151 rotates, the fins 153 can stir the air in the rotor accommodating cavity 13b, thereby generating a pressure difference on both sides of the rotor frame 151 according to the Bernoulli principle, so as to realize the circulation of hot and cold air in the cavity and improve the heat dissipation effect. The shape and number of the fins 153 can be other, and the present application does not make specific restrictions on them.

[0051] Further, see Figure 8 The rotor frame 151 is provided with a plurality of heat dissipation holes 1511. The plurality of heat dissipation holes 1511 axially penetrate the rotor frame 151. The heat dissipation holes 1511 are arranged between two adjacent magnets 152. The plurality of heat dissipation holes 1511 are radially staggered between two adjacent magnets 152. When the rotor frame 151 rotates, a pressure difference is formed on both sides thereof. Under the action of the pressure difference, hot air can be discharged through the heat dissipation holes 1511, thereby cooling the magnets 152. The staggered arrangement of the heat dissipation holes 1511 can fully utilize the space in the rotor frame 151 between adjacent magnets 152 to ensure effective heat dissipation. In other embodiments, the heat dissipation holes 1511 can also be arranged radially. This application does not specifically limit the number and arrangement of the heat dissipation holes 1511.

[0052] The present application cools the drive motor 10 by oil cooling the stator module 14 and air cooling the rotor module 15, resulting in good cooling effect, high cooling efficiency, and high reliability of the drive motor 10. Furthermore, the present application provides a seal to seal and isolate the deceleration chamber 240 from the drive motor 10, preventing the lubricating oil in the deceleration chamber 240 from flowing into the rotor accommodating chamber 13b.

[0053] The present application also provides a vehicle, comprising the wheel hub motor drive system 1 of any embodiment. The wheel hub motor drive system 1 can be integrated on a wheel hub.

[0054] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A hub motor drive system, characterized in that: include: A drive module, the drive module comprising a drive motor and a planetary reduction mechanism, the drive motor comprising a stator module and a rotor module distributed along the axial direction; the planetary reduction mechanism is arranged on one side of the drive motor along the axial direction, and the input end of the planetary reduction mechanism is drivingly connected to the rotor module; A rim mounting flange is provided on one side of the drive module along the axial direction and is transmission-connected to the output end of the planetary reduction mechanism, and a side of the rim mounting flange facing away from the drive module is used for connection with the rim; The braking mechanism includes a brake disc and a brake caliper. The brake disc is arranged along the axial direction on the side of the drive module facing the rim and is fixedly connected to the rim mounting flange. The brake caliper is fixedly connected to the drive module and is used to clamp or release the brake disc. The brake caliper at least partially overlaps with the drive module in the axial direction.

2. The wheel hub motor drive system according to claim 1, characterized in that: The planetary reduction mechanism is arranged between the drive motor and the rim mounting flange along the axial direction.

3. The wheel hub motor drive system according to claim 2, characterized in that: The hub motor drive system further includes: A central shaft, the central shaft is axially arranged in the driving module, a hub bearing is provided on the outer sleeve of the central shaft, the outer ring of the hub bearing is connected to the output end of the planetary reduction mechanism, and the outer ring of the hub bearing is fixedly connected to the rim mounting flange, a bearing mounting cavity is provided on the outside of the central shaft, and the hub bearing is arranged in the bearing mounting cavity; The planetary reduction mechanism includes a housing having a reduction chamber therein. The reduction chamber is communicated with the bearing mounting chamber and is sealed and isolated from the drive motor.

4. The in-wheel motor drive system according to any one of claims 1 to 3, characterized in that: The drive motor includes: A housing, the housing comprising a side plate and two end covers axially connected to both sides of the side plate, the side plate and the two end covers together forming a receiving cavity; a motor shaft, the motor shaft rotatably passing through the housing along the axial direction; Two sealing plates are distributed along the axial direction and are arranged in the accommodating cavity. The two sealing plates and the side plates together form a closed stator accommodating cavity. The stator accommodating cavity is arranged around the motor shaft. One sealing plate and a corresponding end cover together form a rotor accommodating cavity. A stator module is fixedly arranged in the stator accommodating cavity, the stator module includes a plurality of stator assemblies arranged at intervals along the circumferential direction, the stator assembly includes a stator core and a stator coil arranged around the stator core, an outer cavity is formed between the outer periphery of the stator assembly and the side plate, an inner cavity is formed between the inner periphery of the stator assembly and the sealing plate, the outer cavity is connected to the inner cavity, the stator assembly is fixedly connected to the side plate via a first partition plate, the first partition plate divides the outer cavity into two sub-cavities distributed along the circumferential direction, and an oil inlet and an oil outlet are provided on the casing, the oil inlet and the oil outlet are respectively connected to the two sub-cavities; Two rotor modules are respectively arranged on both sides of the stator module along the axial direction and rotatably arranged in the rotor accommodating cavity. The rotor module is fixedly connected to the motor shaft.

5. The wheel hub motor drive system according to claim 4, characterized in that: The stator module further includes a second partition plate, which is radially connected between the side plate and the sealing plate. The second partition plate divides the stator accommodating cavity into two cavities distributed along the axial direction.

6. The wheel hub motor drive system according to claim 4, characterized in that: The sealing plate includes a sealing inner plate and a sealing side plate. The sealing inner plate is annular and surrounds the outside of the motor shaft. The inner periphery of the sealing side plate is connected to the outer periphery of the sealing inner plate. A sealing groove is provided on the outer periphery of the sealing side plate. A sealing ring is provided in the sealing groove. The sealing ring is pressed between the sealing groove and the side plate.

7. The wheel hub motor drive system according to claim 6, characterized in that: The sealing side plate includes a first sealing side plate, a second sealing side plate and a connecting plate. The inner periphery of the first sealing side plate is connected to the outer periphery of the sealing inner plate. The second sealing side plate is arranged on the side of the first sealing side plate away from the stator module. The outer periphery of the second sealing side plate is provided with the sealing groove. The inner periphery of the second sealing side plate is connected to the outer periphery of the first sealing side plate through the connecting plate. The connecting plate is spaced apart from the side plate, and the connecting plate ring is arranged outside the rotor module.

8. The wheel hub motor drive system according to claim 4, characterized in that: The rotor module includes a rotor frame and a magnet. The rotor frame is fixedly connected to the motor shaft. The magnet is arranged on the side of the rotor frame facing the stator assembly. Multiple magnets are arranged at intervals along the circumferential direction. A plurality of fins are protruding from the side of the rotor frame away from the magnet.

9. The wheel hub motor drive system according to claim 8, characterized in that: The rotor frame is provided with a plurality of heat dissipation holes, which penetrate the rotor frame axially. The heat dissipation holes are arranged between two adjacent magnetic steels, and the plurality of heat dissipation holes between two adjacent magnetic steels are staggered in the radial direction.

10. A vehicle, characterized in that: The invention comprises a hub motor drive system according to any one of claims 1 to 9.

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