Hub motor with dual cooling function

Abstract

The utility model relates to a wheel hub motor with a dual cooling function. The wheel hub motor comprises a liquid-gas separation device arranged outside the wheel hub motor. The liquid-gas separation device comprises a gas inlet and a gas outlet, and the gas outlet is located above the gas inlet; an opening in one end of the ventilation pipe is formed in a cavity formed by the machine shell and the end cover, and the other end of the ventilation pipe is connected with a gas inlet of the liquid-gas separation device. The stator support is provided with a cooling pipeline, a liquid storage device for cooling liquid is arranged outside the hub motor, a liquid inlet pipe and a liquid outlet pipe are arranged, and the liquid storage device, the liquid inlet pipe, the cooling pipeline and the liquid outlet pipe form a closed passage of the circulating cooling mechanism; the hub motor can rapidly dissipate heat, rapidly enables internal and external pressure of the hub motor to be balanced, and is convenient to install and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of in-wheel motors, and specifically relates to an in-wheel motor with a dual cooling function. Background Art

[0002] In the existing outer-rotor in-wheel motor, the stator is installed on the stator bracket. The stator bracket is designed with a relatively small inner hole to be fixed on the motor shaft. The left and right end covers are connected to the rim to form a rotor assembly and installed on the motor shaft. During the operation of the electric vehicle in-wheel motor, the current passing through the coils on the stator will generate heat. The heat generated by the coils on the stator is transferred out through two ways at the same time. One is to transfer from the stator to the stator bracket, then the stator bracket transfers it to the motor shaft, and the motor shaft dissipates the heat into the air of the motor housing. The other is to use the air in the motor cavity as a heat conduction medium, and the air in the cavity then transfers the heat to the left and right end covers. After the left and right end covers absorb the heat in the cavity, they dissipate it into the external air. This heat dissipation method has poor overall heat dissipation effect of the motor due to the low thermal conductivity of air and the small contact area between the stator bracket and the motor shaft. The high temperature of the motor coils will also increase the coil resistance, reduce the motor efficiency, and shorten the cruising range of the whole vehicle. In order to dissipate heat quickly, the prior art injects insulating cooling liquid into the motor to achieve the purpose of rapid heat dissipation of the motor. However, inside the liquid-cooled motor, due to the action of high temperature and high-speed rotating rotor, part of the coolant inside the motor housing will be atomized, resulting in too high pressure inside the motor housing, which poses a great challenge to the motor seal. At this time, the motor with poor sealing will leak oil outward. Therefore, it is necessary to relieve the pressure inside the oil-cooled motor housing.

[0003] The commonly used method in the prior art is to install a breather valve on the motor housing and use the breather membrane on the breather valve for gas exchange inside and outside the motor. However, the high temperature during the operation of the motor atomizes the coolant, and the formed gaseous liquid-gas mixture will also diffuse to the breather valve. When the atomized coolant in the liquid-gas mixture cools into liquid droplets, it will adhere to the breather membrane, ultimately causing the breather membrane to lose its gas permeation function. Therefore, how to prevent the liquid-gas mixture from diffusing to the breather valve is a problem to be solved by the current liquid-cooled motor.

[0004] Chinese Invention Application CN117639352A discloses a liquid-cooled motor liquid-blocking labyrinth structure, including a mounting plate. A central hole is provided on the mounting plate. The structure further includes a labyrinth liquid-blocking member mounted on the mounting plate. The labyrinth liquid-blocking member is of an annular structure and is distributed around the central hole. An air-permeable channel is provided inside the labyrinth liquid-blocking member. A first air-permeable port and a second air-permeable port communicating with the air-permeable channel are provided on the labyrinth liquid-blocking member. A main liquid-blocking plate is provided at each air-permeable port. The structure further includes an air-permeable valve mounting hole for mounting an air-permeable valve provided on the labyrinth liquid-blocking member and / or the mounting plate. The gas entering the air-permeable channel from the air-permeable port can be discharged through the air-permeable valve mounted on the air-permeable valve mounting hole, ensuring the air pressure balance inside and outside the motor at all times.

[0005] Although the above technical solution can achieve the air pressure balance inside and outside the motor, the labyrinth structure of the cover is too complex, and the air-permeable membrane cannot ensure long-term undamaged state, and it is not convenient to replace. The effectiveness of maintaining the internal and external pressure balance during the operation of the motor is not high, and the molds for manufacturing the entire motor also need to be correspondingly modified, increasing the production cost. Utility Model Content

[0006] The purpose of the present utility model is to provide a hub motor with a dual cooling function, which solves the problems of complex structure of the existing motor, poor heat dissipation efficiency during the operation of the motor, low effectiveness of maintaining the internal and external pressure balance of the motor, and inconvenience in maintenance and installation.

[0007] To achieve the above purpose, the technical solution of the present utility model is as follows:

[0008] A hub motor with a dual cooling function includes a motor housing, a rotor, a stator, a stator bracket, and two end covers respectively covering the left and right ports of the motor housing;

[0009] The stator bracket includes a stator mounting portion, a connecting portion, a shaft hole for arranging the motor shaft, and cooling pipelines. A total liquid inlet and a total liquid outlet of the cooling pipelines are arranged on the connecting portion; A liquid storage device for coolant is arranged outside the hub motor, and an inlet pipe and an outlet pipe are provided. One end of the inlet pipe is connected to the total liquid inlet, and the other end is connected to the liquid storage device; One end of the outlet pipe is connected to the total liquid outlet, and the other end is connected to the liquid storage device; The liquid storage device, the inlet pipe, the cooling pipelines, and the outlet pipe form the passage of a closed circulating cooling mechanism;

[0010] The motor housing, the stator bracket, and the end covers form a motor cavity, and a cooling insulating liquid is arranged inside the motor cavity;

[0011] The hub motor further includes a liquid-gas separation device arranged outside the hub motor. The liquid-gas separation device includes an air inlet and an air outlet, and the air outlet is located above the air inlet;

[0012] A ventilation pipe is provided. One end of the ventilation pipe opens into the motor cavity, and the other end of the ventilation pipe is connected to the air inlet of the liquid-gas separation device.

[0013] The connecting part is provided with a through hole, and one end of the ventilation pipe enters the motor cavity from the through hole.

[0014] The stator mounting part is arranged on the circumferential surface centered on the shaft hole, and a connecting part is arranged in the space between the shaft hole and the stator mounting part; the total liquid inlet and the total liquid outlet of the cooling pipeline are arranged on the same side of the connecting part;

[0015] The cooling pipeline is arranged in the stator mounting part; the cooling pipeline is composed of pipeline units that are interconnected between the total liquid inlet and the total liquid outlet, and the pipeline unit is a pipeline that penetrates through the left and right ends of the stator mounting part; the cooling pipeline starts from the total liquid inlet as the starting end and ends at the total liquid outlet, and is arranged in a snake shape on the circumferential surface centered on the shaft hole according to the left and right ends of the stator mounting part.

[0016] Each pipeline unit includes a sub-liquid inlet and a sub-liquid outlet; the sub-liquid outlet of any one pipeline unit and the sub-liquid inlet of the previous pipeline unit that is connected and communicated are respectively arranged at both ends of the stator bracket and are interconnected; the sub-liquid inlet of any one pipeline unit and the sub-liquid outlet of the next pipeline unit that is connected and communicated are respectively arranged at both ends of the stator bracket and are interconnected.

[0017] A sink is arranged between the sub-liquid inlet and the sub-liquid outlet of each pipeline unit and is recessed from the end face of the stator mounting part; a water channel cover plate covering the sink is provided.

[0018] The connecting part is provided with a terminal; the stator lead wire is connected to the terminal.

[0019] The liquid-gas separation device is in a box shape; the air inlet is arranged at the bottom of the liquid-gas separation device, and the air outlet is arranged at the top of the liquid-gas separation device;

[0020] A liquid-gas separation channel is arranged between the air inlet and the air outlet of the liquid-gas separation device;

[0021] The liquid-gas separation channel is composed of at least two partition plates arranged in the inner cavity of the liquid-gas separation device; the partition plates are arranged opposite to each other;

[0022] The right end of the first partition plate is connected to the right inner wall of the liquid-gas separation device, and a liquid-gas channel is arranged between the left end of the first partition plate and the left inner wall; the left end of the second partition plate is connected to the left inner wall of the liquid-gas separation device, and a liquid-gas channel is arranged between the right end of the second partition plate and the right inner wall; and so on, the partition plates are alternately arranged in the inner cavity of the liquid-gas separation device, and each partition plate and its liquid-gas channel form the liquid-gas separation channel.

[0023] The partition plate is arranged to incline towards the liquid-gas channel and towards the bottom.

[0024] A breather valve is arranged at the air outlet.

[0025] In the passage of a closed-loop cooling mechanism composed of a liquid storage device, a liquid inlet pipe, a cooling pipe, and a liquid outlet pipe, a booster pump is also provided; there is a height difference on both sides at the bottom of the liquid-gas separation device, and its bottom slopes towards the air inlet side; a filtering device is provided at the air outlet of the liquid-gas separation device.

[0026] The advantages of the present utility model are as follows: 1. Two-stage cooling systems can dissipate heat efficiently and quickly release the high pressure inside the hub motor, rapidly achieving pressure balance inside and outside the hub motor; 2. When the rotor rotates, the heat generated by the stator is transferred to the coolant, and the coolant brings the heat to the stator support. The closed-loop cooling mechanism including the cooling pipe inside the stator support can quickly take away the heat; 3. The stator is installed outside the stator installation part, increasing the contact area between the stator and the stator support, and the heat can be transferred to the coolant in the cooling pipe more quickly; 4. The cooling pipe is arranged on the stator support. After the stator is damaged, the cooling pipe does not prevent the disassembly and assembly of the stator, and the maintenance is convenient; 5. It is possible to achieve efficient and rapid internal and external air pressure balance without changing the original structure of the motor; 6. The external liquid-gas separation device is convenient to install and replace, and the maintenance is also very convenient; 7. The liquid-gas separation channel formed by the inner side wall of the liquid-gas separation device and the liquid-gas channel of the partition plate guides the liquid-gas mixture discharged from the motor entering from the air inlet to rise in a zigzag manner, enabling the liquid-gas mixture to be fully cooled and separated during the zigzag upward process; 8. The partition plate is inclined towards the bottom, allowing the coolant separated from the liquid-gas mixture during the upward process to flow along the partition plate to the bottom and return to the motor through the ventilation pipe after the motor stops running and cools down. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the present utility model.

[0028] Figure 2 is a sectional view of the structure of the present utility model.

[0029] Figure 3 is a schematic structural diagram of the liquid-gas separation device of the present utility model.

[0030] Figure 4 is a schematic structural diagram of the left end face of the stator support of the present utility model.

[0031] Figure 5 is a schematic structural diagram of the right end face of the stator support of the present utility model.

[0032] Figure 6 is a schematic plan view of the unfolded cooling pipe of the present utility model.

[0033] In the figure: 1 - housing; 2 - rotor; 3 - stator; 4 - stator support; 41 - stator mounting portion; 42 - connecting portion; 43 - shaft hole for the motor shaft 5; 44 - sunk groove; 45 - terminal; 5 - motor shaft; 6 - end cover; 7 - liquid-gas separation device; 71 - air inlet; 72 - air outlet; 73 - first partition plate; 74 - second partition plate; 75 - liquid-gas passage; 76 - breather valve; 77 - filtering device; 78 - ventilation pipe; 8 - motor cavity; 9 - cooling pipe; 91 - total liquid inlet; 911 - sub-liquid inlet; 92 - total liquid outlet; 921 - sub-liquid outlet; 93 - liquid inlet pipe; 94 - liquid outlet pipe; 95 - liquid storage device; 96 - pipe unit; 10 - booster pump. Detailed implementation manners

[0034] The following further describes the present utility model with reference to the accompanying drawings. The accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0035] For the sake of more concise description of this embodiment, some components that are well-known to those skilled in the art but not relevant to the main content of this creation will be omitted in the drawings or the description. Additionally, for ease of expression, some components in the drawings will be omitted, enlarged, or reduced, but this does not represent the size or entire structure of the actual product.

[0036] A hub motor with a dual cooling function according to the present utility model, as Figure 1 、 Figure 2 shown, includes a housing 1, a rotor 2, a stator 3, a stator support 4, a motor shaft 5, and two end covers 6 respectively covering the left and right ports of the housing 1;

[0037] As Figure 2 、 Figure 4 、 Figure 5 shown, the stator support 4 includes a stator mounting portion 41, a connecting portion 42, a shaft hole 43 for the motor shaft 5, and a cooling pipe 9. A total liquid inlet 91 and a total liquid outlet of the cooling pipe 9 are provided in the connecting portion 42; a liquid storage device 95 for the coolant is provided outside the hub motor, and a liquid inlet pipe 93 and a liquid outlet pipe 94 are provided. One end of the liquid inlet pipe 93 is connected to the total liquid inlet 91, and the other end is connected to the liquid storage device 95; one end of the liquid outlet pipe 94 is connected to the total liquid outlet 92, and the other end is connected to the liquid storage device 95; the liquid storage device 95, the liquid inlet pipe 93, the cooling pipe 9, and the liquid outlet pipe 94 form a passage of a closed circulating cooling mechanism to carry away the heat generated by the stator 3 through the closed circulating cooling mechanism.

[0038] As Figure 4 、 Figure 5 、 Figure 6As shown, the stator mounting portion 41 is provided on the circumferential surface centered on the shaft hole 43, and a connecting portion 42 is provided in the space between the shaft hole 43 and the stator mounting portion 41; the total liquid inlet 91 and the total liquid outlet 92 of the cooling pipe 9 are provided on the same side of the connecting portion 42.

[0039] The cooling pipe 9 is provided in the stator mounting portion 41; the cooling pipe 9 is composed of pipe units 96 that are interconnected between the total liquid inlet 91 and the total liquid outlet 92, and the pipe units 96 are pipes that penetrate through the left and right ends of the stator mounting portion 41; the cooling pipe 9 starts from the total liquid inlet 91 as the starting end and ends at the total liquid outlet 92, and is arranged in a serpentine manner on the circumferential surface centered on the shaft hole 43 along the left and right ends of the stator mounting portion 41. That is, taking the left and right ends of the stator mounting portion 41 as turning points, starting from the total liquid inlet 91 as the starting point, it is arranged in a serpentine manner from left to right to left to right in the stator mounting portion 41, and finally reaches the total liquid outlet 92, forming a complete serpentine arranged cooling pipe 9 within the stator mounting portion 41.

[0040] As Figure 6 shown in the planar development view of the cooling pipe 9, each pipe unit 96 includes a sub-liquid inlet 911 and a sub-liquid outlet 921; the sub-liquid outlet 921 of any one pipe unit 96 and the sub-liquid inlet 911 of the previous pipe unit 96 that is connected and communicated are respectively arranged at both ends of the stator bracket 41 and are interconnected; similarly, the sub-liquid inlet 911 of any one pipe unit 96 and the sub-liquid outlet 921 of the next pipe unit 96 that is connected and communicated are respectively arranged at both ends of the stator bracket 41 and are interconnected.

[0041] Furthermore, as Figure 4 、 Figure 5 shown, a sunk groove 44 that is recessed from the end face of the stator mounting portion 41 is provided between the sub-liquid inlet 911 and the sub-liquid outlet 921 of each pipe unit 96; in order to form a closed cooling pipe 9, water channel covers that cover the sunk groove 44 are provided on both end faces of the stator mounting portion 41. In this way, the external liquid storage device 95 of the in-wheel motor, the liquid inlet pipe 93, the cooling pipe 9, and the liquid outlet pipe 94 together constitute a closed-loop in-wheel motor cooling mechanism. Furthermore, a booster pump 10 is also provided in the passage of the closed-loop circulating cooling mechanism.

[0042] The housing 1, the stator support 41 and the end covers 6 form a motor cavity 8, and a cooling insulating liquid is provided in the motor cavity 8. During the rotation of the rotor 2, the cooling insulating liquid penetrates into the coils that make up the stator 3, and directly takes out the heat inside the coils and transfers it to the motor shaft 5, the stator support 4 and the left and right end covers 6, so that the heat is dissipated. The cooling pipes 9 are provided on the stator support 4. Through the externally connected booster pump 10, it can ensure that the coolant quickly circulates in the path of the closed circulating cooling mechanism composed of the liquid storage device 95, the liquid inlet pipe 93, the cooling pipes 9, and the liquid outlet pipe 94, and at the same time takes away the heat transferred from the stator 3 and the cooling insulating liquid to the stator support 4, so that the cooling insulating liquid in the motor cavity 8 is maintained in a lower temperature range.

[0043] It further includes a liquid-gas separation device 7 provided outside the in-wheel motor. The liquid-gas separation device 7 includes an air inlet 71 and an air outlet 72, and the air outlet 72 is located above the air inlet 71; a ventilation pipe 78 is provided, and one end of the ventilation pipe 78 opens into the motor cavity 8, and the other end of the ventilation pipe 78 is connected to the air inlet 71 of the liquid-gas separation device 7.

[0044] Preferably, a through hole is provided at the connecting portion 41, and one end of the ventilation pipe 78 enters the motor cavity 8 through the through hole.

[0045] The function of the liquid-gas separation device 7 is to smoothly discharge the high-temperature gas in the motor, so as to balance the pressure in the motor with the outside world. Therefore, as Figure 3 shown, a liquid-gas separation channel is provided between the air inlet 71 and the air outlet 72 of the liquid-gas separation device 7.

[0046] Preferably, the liquid-gas separation device 7 is designed in a box shape; the air inlet 71 is provided at the bottom of the liquid-gas separation device 7, and the air outlet 72 is provided at the top of the liquid-gas separation device 7.

[0047] The liquid-gas separation channel is composed of at least two partition plates provided in the inner cavity of the liquid-gas separation device 7; multiple partition plates can be provided, and the partition plates are arranged oppositely.

[0048] As Figure 3 shown, the right end of the first partition plate 73 is connected to the right inner wall of the liquid-gas separation device 7, and a liquid-gas channel 75 is provided between the left end of the first partition plate 73 and the left inner wall; the left end of the second partition plate 74 is connected to the left inner wall of the liquid-gas separation device 7, and a liquid-gas channel 75 is provided between the right end of the second partition plate 74 and the right inner wall; and so on. The partition plates are alternately arranged in the inner cavity of the liquid-gas separation device 7, and each partition plate and its liquid-gas channel 75 form a liquid-gas separation channel. By providing partition plates in the inner cavity of the liquid-gas separation device 7, the running distance of the liquid-gas mixture is artificially increased, so that the liquid-gas mixture can be fully cooled and separated.

[0049] Further, the isolation plate is arranged to incline towards the liquid-gas channel 75 and towards the bottom. In this way, the cooled coolant in the liquid-gas mixture can flow along the isolation plate towards the bottom, and finally flow to the air inlet 71, and return to the motor cavity 8 through the ventilation pipe 78.

[0050] There is a height difference on both sides of the bottom of the liquid-gas separation device 7, and its bottom inclines towards the air inlet 71 side, which makes it more convenient for the coolant to flow back.

[0051] Multiple staggered isolation plates that incline downwards. Adjacent two isolation plates form a narrow channel for the liquid-gas mixture. High-pressure areas and low-pressure areas are respectively formed at both ends of the narrow channel for the liquid-gas mixture. When the high-temperature liquid-gas mixture flows from the high-pressure area through the low-pressure area, the liquid-gas mixture will be compressed and condensed, and the small-molecule coolant mist will condense into large-molecule coolant droplets. If the isolation plate is made of metal material, when contacting the metal isolation plate, it will condense into coolant and flow down along the isolation plate to the air inlet 71. The liquid-gas separation device 7 forms an S-shaped operation path for the liquid-gas mixture by multiple isolation plates, so that the content of the coolant in the liquid-gas mixture becomes less and less when it is discharged upwards.

[0052] Further, the liquid-gas separation device 7 is designed to be in the shape of a cubic box, and the width of the isolation plate is the same as the inner cavity width of the liquid-gas separation device 7, so as to ensure that the liquid-gas mixture can only operate along the directions of the air inlet 71, the liquid-gas channel 75, and the air outlet 72.

[0053] A ventilation valve 76 is arranged at the air outlet 72, and a ventilation membrane can be installed at the ventilation valve 76 to ensure that only air in the external environment can enter the liquid-gas separation device 7.

[0054] A filtering device 77 is arranged at the air outlet 72. The uncondensed coolant molecules in the isolation plate will be blocked in the filtering device 77 to ensure that the air discharged to the ventilation valve 76 is pure air, avoid the coolant mist adsorbing on the surface of the ventilation valve 76 and reducing the exhaust effect, and further ensure that only the gas part in the liquid-gas mixture can reach the air outlet 72.

[0055] The connecting part 42 is provided with a terminal 45; the stator lead-out wire is connected to the terminal 45. In this way, the stator lead-out wire does not need to be led out through the wire outlet hole on the motor shaft 5 as in the prior art, but is connected to the terminal 45 and externally electrically connected to the in-wheel motor through the terminal 45. In this way, the motor shaft 5 does not need to be provided with a hollow wire outlet hole, and the strength is greatly enhanced.

[0056] The above is only the preferred embodiment of the present invention, and is not used to limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should fall within the technical scope of the present invention.

Claims

1. A hub motor with dual cooling function, comprising a housing (1), a rotor (2), a stator (3), a stator bracket (4), a motor shaft (5), and two end covers (6) respectively covering left and right ports of the housing (1); Features: The stator bracket (4) comprises a stator mounting portion (41), a connecting portion (42), an axial hole (43) for arranging a motor shaft (5), and a cooling pipeline (9); a total liquid inlet (91) and a total liquid outlet (92) of the cooling pipeline (9) are arranged at the connecting portion (42); a liquid storage device (95) for cooling liquid is arranged outside the wheel hub motor, and a liquid inlet pipe (93) and a liquid outlet pipe (94) are arranged; one end of the liquid inlet pipe (93) is connected to the total liquid inlet (91), and the other end is connected to the liquid storage device (95); one end of the liquid outlet pipe (94) is connected to the total liquid outlet (92), and the other end is connected to the liquid storage device (95); the liquid storage device (95), the liquid inlet pipe (93), the cooling pipeline (9), and the liquid outlet pipe (94) constitute a passage of a closed circulation cooling mechanism; The housing (1), the stator bracket (4) and the end cover (6) form a motor cavity (8), and a cooling insulating liquid is provided in the motor cavity (8); It also includes a liquid-gas separation device (7) arranged outside the wheel hub motor, the liquid-gas separation device (7) including an air inlet (71) and an air outlet (72), and the air outlet (72) is located above the air inlet (71); A ventilation pipe (78) is provided, one end of the ventilation pipe (78) opens into the motor cavity (8), and the other end of the ventilation pipe (78) is connected to the air inlet (71) of the liquid-gas separation device (7).

2. The hub motor with dual cooling function according to claim 1, characterized in that: The connecting portion (42) is provided with a through hole, and one end of the vent pipe (78) enters the motor cavity (8) through the through hole.

3. The hub motor with dual cooling function according to claim 1, characterized in that: The stator mounting portion (41) is arranged on a circumferential surface centered on the shaft hole (43), and a connecting portion (42) is arranged in the space between the shaft hole (43) and the stator mounting portion (41); the total liquid inlet (91) and the total liquid outlet (92) of the cooling pipe (9) are arranged on the same side of the connecting portion (42); The cooling pipeline (9) is arranged on the stator mounting portion (41); the cooling pipeline (9) is composed of a pipeline unit (96) interconnected from the total liquid inlet (91) to the total liquid outlet (92), and the pipeline unit (96) is a pipeline that passes through the left and right ends of the stator mounting portion (41); the cooling pipeline (9) has the total liquid inlet (91) as a starting end and the total liquid outlet (92) as an end, and is arranged in a serpentine shape on a circumferential surface centered on the shaft hole (43) and along the left and right ends of the stator mounting portion (41).

4. The hub motor with dual cooling function according to claim 3, characterized in that: Each pipeline unit (96) comprises a sub-liquid inlet (911) and a sub-liquid outlet (921); the sub-liquid outlet (921) of any pipeline unit (96) and the sub-liquid inlet (911) of the previous pipeline unit (96) connected thereto are respectively arranged at two ends of the stator support (4) and are interconnected; the sub-liquid inlet (911) of any pipeline unit (96) and the sub-liquid outlet (921) of the next pipeline unit (96) connected thereto are respectively arranged at two ends of the stator support (4) and are interconnected.

5. The hub motor with dual cooling function according to claim 4, characterized in that: A sink (44) recessed in the end surface of the stator mounting portion (41) is provided between the sub-liquid inlet (911) and the sub-liquid outlet (921) of each pipeline unit (96); and a waterway cover plate covering the sink (44) is provided.

6. The hub motor with dual cooling function according to claim 1, characterized in that: The connection portion (42) is provided with a terminal post (45); the stator lead wire is connected to the terminal post (45).

7. The hub motor with dual cooling function according to claim 1, characterized in that: The liquid-gas separation device (7) is box-shaped; the air inlet (71) is arranged at the bottom of the liquid-gas separation device (7), and the air outlet (72) is arranged at the top of the liquid-gas separation device (7); A liquid-gas separation channel is provided between the gas inlet (71) and the gas outlet (72) of the liquid-gas separation device (7); The liquid-gas separation channel is composed of at least two isolation plates arranged in the inner cavity of the liquid-gas separation device (7); the isolation plates are arranged opposite to each other; The right end of the first isolation plate (73) is connected to the right inner wall of the liquid-gas separation device (7), and a liquid-gas passage (75) is provided between the left end of the first isolation plate (73) and the left inner wall; the left end of the second isolation plate (74) is connected to the left inner wall of the liquid-gas separation device (7), and a liquid-gas passage (75) is provided between the right end of the second isolation plate (74) and the right inner wall; and so on, the isolation plates are alternately provided in the inner cavity of the liquid-gas separation device (7), and each isolation plate and its liquid-gas passage constitutes a liquid-gas separation passage.

8. The hub motor with dual cooling function according to claim 7, characterized in that: The isolation plate is arranged to be inclined toward the liquid-gas channel (75) and toward the bottom.

9. The hub motor with dual cooling function according to claim 1, characterized in that: A vent valve (76) is provided at the air outlet (72).

10. The hub motor with dual cooling function according to claim 1, characterized in that: A booster pump (10) is also provided in the passage of the closed circulation cooling mechanism formed by the liquid storage device (95), the liquid inlet pipe (93), the cooling pipe (9), and the liquid outlet pipe (94); A height difference is provided on both sides of the bottom of the liquid-gas separation device (7), and the bottom thereof is inclined toward the air inlet (71); A filtering device (77) is provided at the gas outlet (72) of the liquid-gas separation device (7).

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