Hub motor and electric vehicle

Abstract

The utility model discloses a wheel hub motor and an electric vehicle, the wheel hub motor comprises a motor shaft, an end cover assembly, a rotor assembly, a stator assembly and a ventilation valve, and the motor shaft is provided with an exhaust channel; the motor shaft is sleeved with the end cover assembly, the oil seal assembly is arranged between the end cover assembly and the motor shaft, exhaust holes are formed in the end cover assembly, the rotor assembly is connected with the end cover assembly, the rotor assembly, the end cover assembly, the oil seal assembly and the motor shaft jointly form a cooling liquid containing cavity in a surrounding mode, and the end cover assembly, the oil seal assembly and the motor shaft jointly form a middle cavity in a surrounding mode. The exhaust channel is communicated with the cooling liquid containing cavity and the middle cavity, the exhaust hole is communicated with the middle cavity and the outside, the stator assembly is coaxially connected with the motor shaft and located in the cooling liquid containing cavity, and the ventilation valve is installed in the exhaust hole. The hub motor provided by the utility model has the advantages of high exhaust reliability and long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a hub motor and an electric vehicle. Background Art

[0002] The hub motors currently used in the two-wheel vehicle industry have a large speed span. In the low-speed and high-torque stage, the motor efficiency is low, the reactive loss is large, and the motor generates a lot of heat. The relevant technology usually uses built-in coolant to reduce the temperature rise of the motor and speed up the heat dissipation of the motor. However, due to the thermal expansion and contraction of the gas inside the motor, a pressure difference will be generated. The internal structure of the motor is closed, resulting in the inability to relieve pressure. When the pressure is large enough, it will impact the oil seal / motor lead wire / motor end cover, destroying the motor seal, causing oil leakage or water ingress to the motor, and reducing the service life of the motor.

[0003] In order to solve the above defects, one method is to add a gas-liquid separator to the motor shaft inside the motor, the gas-liquid separator is connected to the exhaust pipe, and passes through the motor shaft hole together with the motor lead wire to connect to the external environment to achieve air pressure balance. Another method is to install a breather valve on the motor shaft, and the center hole of the motor shaft is connected to the breather valve to lead to the external environment to achieve air pressure balance. However, the above two methods are limited by the size of the motor shaft and both have the defect of easy exhaust failure. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the utility model provides a hub motor, which has the advantages of high exhaust reliability and long service life.

[0006] The embodiment of the utility model further provides an electric vehicle.

[0007] The hub motor of the utility model embodiment comprises a motor shaft, an end cover assembly, a rotor assembly, a stator assembly and a breathable valve, wherein the motor shaft is provided with an exhaust passage; the end cover assembly is sleeved on the motor shaft, an oil seal assembly is provided between the end cover assembly and the motor shaft, and an exhaust hole is provided on the end cover assembly; the rotor assembly is connected to the end cover assembly, the rotor assembly, the end cover assembly, the oil seal assembly and the motor shaft together surround a molded coolant accommodating chamber, the end cover assembly, the oil seal assembly and the motor shaft together surround a molded intermediate chamber, the exhaust passage connects the coolant accommodating chamber and the intermediate chamber, and the exhaust hole connects the intermediate chamber and the outside; the stator assembly is coaxially connected to the motor shaft and is located in the coolant accommodating chamber; the breathable valve is installed in the exhaust hole.

[0008] According to the hub motor of the embodiment of the present utility model, the rotor assembly, the end cover assembly, the oil seal assembly and the motor shaft jointly surround and form a coolant accommodating cavity, and the end cover assembly, the oil seal assembly and the motor shaft jointly surround and form an intermediate cavity. The coolant accommodating cavity is communicated with the intermediate cavity through an exhaust passage on the motor shaft, and the intermediate cavity is communicated with the outside through an exhaust hole on the end cover assembly, thereby ensuring the air pressure balance in the coolant accommodating cavity. Wherein, a breather valve is arranged in the exhaust hole. While facilitating the passage of gas through the exhaust hole, it prevents external water vapor from entering the coolant accommodating cavity, ensuring the waterproof and sealing reliability of the hub motor. In addition, the setting of the intermediate cavity facilitates the arrangement of the exhaust hole on the end cover assembly, so that the exhaust hole is not limited by the size of the motor shaft. The sizes of the exhaust hole and the breather valve can be designed larger, so it is less likely to be blocked and cause exhaust failure. The exhaust reliability of the hub motor is higher and the service life is longer.

[0009] In some embodiments, the hub motor further includes a gas guide pipe, the gas guide pipe is located in the coolant accommodating cavity, a first end of the gas guide pipe is communicated with the exhaust passage, and a second end of the gas guide pipe is located above the motor shaft and is connected to the stator assembly.

[0010] In some embodiments, an opening of the exhaust passage located in the coolant accommodating cavity is arranged upward, and the first end of the gas guide pipe is inserted into the exhaust passage;

[0011] And / or, the stator assembly includes a stator bracket, the stator bracket includes a first enclosure and a second enclosure arranged at intervals along the axial direction of the motor shaft, an installation hole is arranged on the first enclosure, and the second end of the gas guide pipe passes through the installation hole and is located between the first enclosure and the second enclosure.

[0012] In some embodiments, the end cover assembly includes a first end cover and a second end cover, the first end cover and the second end cover are respectively connected to two opposite sides of the rotor assembly in the axial direction of the motor shaft, the exhaust hole is arranged on the first end cover, and the first end cover, the motor shaft and the oil seal assembly jointly surround and form the intermediate cavity.

[0013] In some embodiments, the oil seal assembly includes a first oil seal and a second oil seal, both the first oil seal and the second oil seal are arranged between the motor shaft and the first end cover, the first oil seal and the second oil seal are arranged at intervals along the axial direction of the motor shaft, and the first oil seal, the second oil seal, the motor shaft and the first end cover jointly surround and form the intermediate cavity.

[0014] In some embodiments, an observation hole communicated with the coolant accommodating cavity is arranged on the first end cover or the second end cover, the observation hole is lower than the liquid level of the coolant in the coolant accommodating cavity, and the hub motor further includes a light-transmitting member that closes the observation hole.

[0015] In some embodiments, a liquid injection hole communicating with the coolant accommodation cavity is provided on the second end cap or the second end cap, and the in-wheel motor further includes a threaded member threadedly engaged in the liquid injection hole.

[0016] In some embodiments, a part of the air vent valve is threadedly engaged in the exhaust hole; a receiving groove is provided on a side of the first end cap facing away from the second end cap, and the rest of the air vent valve is located in the receiving groove.

[0017] In some embodiments, a wire outlet channel is provided on the motor shaft, the wire outlet hole is located on a side of the stator assembly facing away from the exhaust channel, and the in-wheel motor further includes a motor lead wire electrically connected to the stator assembly, and the motor lead wire is exposed from the wire outlet channel to a side of the second end cap facing away from the first end cap.

[0018] An electric vehicle according to an embodiment of the present invention includes an in-wheel motor as described in any one of the above embodiments.

[0019] The technical advantages of the electric vehicle according to the embodiment of the present invention are the same as those of the in-wheel motor in the above embodiments, and will not be elaborated here. Description of the Drawings

[0020] Figure 1 is a front view of an in-wheel motor according to an embodiment of the present invention.

[0021] Figure 2 is a left view of an in-wheel motor according to an embodiment of the present invention.

[0022] Figure 3 is a right view of an in-wheel motor according to an embodiment of the present invention.

[0023] Figure 4 is a sectional view of an in-wheel motor according to an embodiment of the present invention.

[0024] Figure 5 is an exploded view of an in-wheel motor according to an embodiment of the present invention.

[0025] Reference Signs:

[0026] 1. Motor shaft; 11. Exhaust passage; 12. Lead-out passage; 2. End cover assembly; 21. First end cover; 211. Exhaust hole; 22. Second end cover; 221. Accommodating groove; 3. Stator assembly; 31. Stator bracket; 311. First enclosure; 3111. Mounting hole; 312. Second enclosure; 4. Air duct; 5. Rotor assembly; 6. Breather valve; 7. Threaded part; 8. Translucent part; 9. First oil seal; 10. Second oil seal; 110. Third oil seal; 120. Bearing; 130. Motor lead; 140. Coolant accommodation cavity; 150. Intermediate cavity. Detailed implementation manners

[0027] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following will be combined with Figures 1 - 5 to describe the in-wheel motor according to the embodiments of the present invention.

[0029] The in-wheel motor according to the embodiments of the present invention includes a motor shaft 1, an end cover assembly 2, a rotor assembly 5, a stator assembly 3, and a breather valve 6. An exhaust passage 11 is provided on the motor shaft 1. The end cover assembly 2 is sleeved on the motor shaft 1. An oil seal assembly is provided between the end cover assembly 2 and the motor shaft 1. An exhaust hole 211 is provided on the end cover assembly 2. The rotor assembly 5 is connected to the end cover assembly 2. The rotor assembly 5, the end cover assembly 2, the oil seal assembly, and the motor shaft 1 jointly enclose and form a coolant accommodation cavity 140. The end cover assembly 2, the oil seal assembly, and the motor shaft 1 jointly enclose and form an intermediate cavity 150. The exhaust passage 11 communicates the coolant accommodation cavity 140 and the intermediate cavity 150. The exhaust hole 211 communicates the intermediate cavity 150 and the outside. The stator assembly 3 is coaxially connected to the motor shaft 1 and is located in the coolant accommodation cavity 140. The breather valve 6 is installed in the exhaust hole 211.

[0030] According to the hub motor of the embodiment of the present utility model, the rotor assembly 5, the end cover assembly 2, the oil seal assembly and the motor shaft 1 jointly surround and form a coolant accommodating cavity 140, and the end cover assembly 2, the oil seal assembly and the motor shaft 1 jointly surround and form an intermediate cavity 150. The coolant accommodating cavity 140 is communicated with the intermediate cavity 150 through an exhaust passage 11 on the motor shaft 1, and the intermediate cavity 150 is communicated with the outside through an exhaust hole 211 on the end cover assembly 2, thereby ensuring the air pressure balance in the coolant accommodating cavity 140. Among them, a breather valve 6 is arranged in the exhaust hole 211. While facilitating the passage of gas through the exhaust hole 211, it prevents external water vapor from entering the coolant accommodating cavity 140, ensuring the waterproof and sealing reliability of the hub motor. In addition, the setting of the intermediate cavity 150 facilitates the arrangement of the exhaust hole 211 on the end cover assembly 2. Furthermore, the exhaust hole 211 is not limited by the size of the motor shaft 1, and the sizes of the exhaust hole 211 and the breather valve 6 can be designed larger, so it is less likely to be blocked and cause exhaust failure, and the exhaust reliability of the hub motor is higher and the service life is longer.

[0031] It should be noted that the end cover assembly 2 is sleeved on the motor shaft 1 through a bearing 120. The coolant accommodating cavity 140 and the intermediate cavity 150 are arranged at intervals along the axial direction of the motor shaft 1, and the exhaust hole 211 and the intermediate cavity 150 are arranged along the radial direction of the motor shaft 1.

[0032] In some embodiments, such as Figure 4 and Figure 5 shown, the hub motor further includes a gas guide pipe 4. The gas guide pipe 4 is located in the coolant accommodating cavity 140. The first end of the gas guide pipe 4 is communicated with the exhaust passage 11, and the second end of the gas guide pipe 4 is located above the motor shaft 1 and is connected to the stator assembly 3.

[0033] When the hub motor works, the coolant in the coolant accommodating cavity 140 will be scattered on the surfaces of the motor shaft 1 and the stator assembly 3. At this time, due to the setting of the gas guide pipe 4, the coolant is less likely to adhere to the second end face of the gas guide pipe 4, and further less likely to enter the gas guide pipe 4 from the opening of the second end of the gas guide pipe 4. The probability of the coolant blocking the exhaust pipe is lower, and the exhaust reliability of the hub motor is higher.

[0034] Specifically, the second end of the gas guide pipe 4 is higher than the motor shaft 1, and thus the distance from the coolant liquid level is greater, and the probability of the coolant entering the gas guide pipe 4 is lower. The second end of the gas guide pipe 4 can be fixed to the stator assembly 3 by clamping or screwing.

[0035] In some embodiments, such as Figure 4As shown, the opening of the exhaust passage 11 in the coolant accommodating chamber 140 is arranged upward, and the first end of the air duct 4 is inserted in the exhaust passage 11. And / or, the stator assembly 3 includes a stator bracket 31, and the stator bracket 31 includes a first enclosure 311 and a second enclosure 312 arranged at intervals along the axial direction of the motor shaft 1, and the first enclosure 311 is provided with a mounting hole 3111, and the second end of the air duct 4 passes through the mounting hole 3111 and is located between the first enclosure 311 and the second enclosure 312.

[0036] That is, the lower end of the air duct 4 is inserted obliquely downward into the exhaust passage 11, so that the reliability of the connection between the air duct 4 and the exhaust passage 11 is high. In addition, the second end of the air duct 4 is arranged between the first enclosure 311 and the second enclosure 312 in the stator bracket 31. Under the shielding of the first enclosure 311 and the second enclosure 312, the coolant is less likely to adhere to the second end surface of the air duct 4 and enter the air duct 4, and the exhaust failure probability of the hub motor is lower.

[0037] Specifically, the lower end of the air duct 4 is interference fit in the exhaust channel 11 to achieve the sealing connection between the air duct 4 and the motor shaft 1, the upper end of the air duct 4 is interference fit in the mounting hole 3111, and / or the upper end of the air duct 4 is clamped on the first enclosure 311, so that the upper end of the air duct 4 is reliably fixed between the first enclosure 311 and the second enclosure 312.

[0038] In some embodiments, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the end cover assembly 2 includes a first end cover 21 and a second end cover 22. The first end cover 21 and the second end cover 22 are respectively connected to the rotor assembly 5 on both sides of the motor shaft 1 that are axially opposite to each other. The first end cover 21 is provided with an exhaust hole 211. The first end cover 21, the motor shaft 1 and the oil seal assembly together surround and form an intermediate cavity 150.

[0039] That is, the exhaust hole 211 is only provided on the first end cover 21, and the first end cover 21 is more convenient to surround the motor shaft 1 and the oil seal assembly to form the intermediate cavity 150 connecting the coolant accommodating cavity 140 and the exhaust hole 211. In this case, only one breathable valve 6 is required to realize the connection between the coolant accommodating cavity 140 and the outside, and the exhaust cost of the hub assembly is lower.

[0040] Specifically, the first end cover 21 is fixed to the first side of the rotor assembly 5 by a plurality of bolts, and the second end cover 22 is fixed to the second side of the rotor assembly 5 by a plurality of bolts.

[0041] In some embodiments, Figure 4As shown, the oil seal assembly includes a first oil seal 9 and a second oil seal 10, and the first oil seal 9 and the second oil seal 10 are both arranged between the motor shaft 1 and the first end cover 21, and the first oil seal 9 and the second oil seal 10 are arranged at intervals along the axial direction of the motor shaft 1, and the first oil seal 9, the second oil seal 10, the motor shaft 1 and the first end cover 21 together surround the molded intermediate cavity 150.

[0042] The arrangement of the first oil seal 9 and the second oil seal 10 makes the sealing of the intermediate cavity 150 better, and the external water vapor and dust are less likely to enter the intermediate cavity 150, and the exhaust reliability of the hub motor is higher. In addition, the second oil seal 10 can be arranged on the side of the first oil seal 9 away from the coolant accommodating cavity 140 to facilitate the removal of the second oil seal 10, and then when the exhaust abnormality occurs, it is convenient to realize the maintenance and maintenance of the entire exhaust system through the intermediate cavity 150.

[0043] Specifically, the middle cavity 150 is an annular cavity, the first oil seal 9 and the second oil seal 10 are sandwiched between the first end cover 21 and the motor shaft 1 bracket, and a bearing 120 is also provided between the first end cover 21 and the motor shaft 1. The bearing 120 is located on the side of the first oil seal 9 away from the second oil seal 10.

[0044] In some embodiments, Figure 3 As shown, the first end cover 21 or the second end cover 22 is provided with an observation hole connected to the coolant accommodating chamber 140, and the observation hole is lower than the liquid level of the coolant in the coolant accommodating chamber 140. The hub motor also includes a light-transmitting member 8, which closes the observation hole.

[0045] The light-transmitting member 8 of the observation hole can be used to observe the coolant content in the coolant containing chamber 140 in real time. When no coolant is observed, it means that the coolant is insufficient, and the user can be reminded to inject coolant into the coolant containing chamber 140 in time to better ensure the heat dissipation reliability of the coolant to the hub motor.

[0046] Specifically, an observation hole is provided on the second end cover 22, and the light-transmitting member 8 can be made of transparent glass or plastic. The light-transmitting member 8 can be connected to the second end cover 22 by at least one of bonding, clamping and screwing.

[0047] In some embodiments, Figure 4 As shown, the second end cover 22 or the second end cover 22 is provided with a liquid injection hole connected to the coolant accommodating chamber 140, and the hub motor also includes a threaded member 7, and the threaded member 7 is threadedly fitted in the liquid injection hole.

[0048] That is, when it is found that the coolant in the coolant accommodating chamber 140 is insufficient, the threaded member 7 can be removed to inject the coolant into the coolant accommodating chamber 140 through the injection hole, and the injection is convenient and quick. Moreover, the threaded member 7 is threadedly engaged in the injection hole to achieve the blocking of the injection hole, the blocking reliability of the injection hole is high, and the threaded member 7 is easy to disassemble and assemble.

[0049] Specifically, the liquid injection hole and the observation hole are arranged at intervals along the radial direction of the motor shaft 1. The liquid injection hole is located directly above the motor shaft 1, and the observation hole is located directly below the motor shaft 1.

[0050] In some embodiments, as Figure 4 and Figure 5 shown, part of the air vent valve 6 is threadedly engaged in the exhaust hole 211. A receiving groove 221 is provided on the side of the first end cover 21 facing away from the second end cover 22, and the remaining part of the air vent valve 6 is located in the receiving groove 221.

[0051] The provision of the receiving groove 221 realizes the concealment of the exposed air vent valve 6, effectively preventing the air vent valve 6 from being disturbed by the external environment and loosening or even falling off, and thus effectively ensuring the waterproof sealing reliability of the coolant accommodation cavity 140.

[0052] Specifically, the air vent valve 6 is a two-way air vent valve, that is, the gas in the coolant accommodation cavity 140 can be discharged to the outside through the air vent valve 6, and the gas outside can also enter the coolant accommodation cavity 140 through the air vent valve 6, thereby better ensuring that the air pressure in the coolant accommodation cavity 140 is consistent with the outside air pressure.

[0053] In some embodiments, as Figure 4 shown, a wire outlet channel 12 is provided on the motor shaft 1. The wire outlet hole is located on the side of the stator assembly 3 facing away from the exhaust channel 11. The hub motor further includes a motor lead wire 130 electrically connected to the stator assembly 3, and the motor lead wire 130 is exposed from the wire outlet channel 12 to the side of the second end cover 22 facing away from the first end cover 21.

[0054] That is, the exhaust channel 11 and the wire outlet channel 12 are located at different positions on the motor shaft 1. Furthermore, the size design of the exhaust channel 11 is not affected by the wire outlet channel 12, and the size of the exhaust channel 11 can be designed to be larger. As a result, the probability of exhaust failure of the hub motor is lower, and the hub motor is less likely to have its service life reduced due to the occurrence of air pressure difference.

[0055] The electric vehicle according to an embodiment of the present invention includes the hub motor as described in any of the above embodiments.

[0056] The technical advantages of the electric vehicle according to an embodiment of the present invention are the same as those of the hub motor in the above embodiments, and will not be elaborated here.

[0057] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 utility model.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0059] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on the top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under the bottom of" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0061] In the present utility model, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0062] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Any changes, modifications, substitutions and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. A hub motor, characterized in that, include: A motor shaft, wherein an exhaust passage is provided on the motor shaft; An end cover assembly, wherein the end cover assembly is sleeved on the motor shaft, an oil seal assembly is provided between the end cover assembly and the motor shaft, and an exhaust hole is provided on the end cover assembly; A rotor assembly, wherein the rotor assembly is connected to the end cover assembly, the rotor assembly, the end cover assembly, the oil seal assembly and the motor shaft are together surrounding a molded coolant accommodating chamber, the end cover assembly, the oil seal assembly and the motor shaft are together surrounding a molded intermediate chamber, the exhaust passage is connected to the coolant accommodating chamber and the intermediate chamber, and the exhaust hole is connected to the intermediate chamber and the outside; a stator assembly, the stator assembly being coaxially connected to the motor shaft and being located in the coolant containing chamber; and A vent valve is installed in the exhaust hole.

2. The in-wheel motor according to claim 1, wherein, The hub motor further includes an air duct, which is located in the coolant containing chamber, wherein a first end of the air duct is communicated with the exhaust passage, and a second end of the air duct is located above the motor shaft and connected to the stator assembly.

3. The in-wheel motor according to claim 2, characterized in that The opening of the exhaust passage located in the coolant accommodating chamber is arranged upward, and the first end of the air guide pipe is inserted in the exhaust passage; And / or, the stator assembly includes a stator bracket, the stator bracket includes a first enclosure and a second enclosure arranged at intervals along the axial direction of the motor shaft, the first enclosure is provided with a mounting hole, the second end of the air duct passes through the mounting hole and is located between the first enclosure and the second enclosure.

4. The in-wheel motor according to claim 1, wherein The end cover assembly includes a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively connected to the rotor assembly on two opposite sides of the motor shaft in the axial direction, the first end cover is provided with the exhaust hole, and the first end cover, the motor shaft and the oil seal assembly together surround and form the intermediate cavity.

5. The in-wheel motor according to claim 4, wherein The oil seal assembly includes a first oil seal and a second oil seal, wherein the first oil seal and the second oil seal are both arranged between the motor shaft and the first end cover, the first oil seal and the second oil seal are arranged at intervals along the axial direction of the motor shaft, and the first oil seal, the second oil seal, the motor shaft and the first end cover jointly surround and form the intermediate cavity.

6. The in-wheel motor according to claim 4, wherein, The first end cover or the second end cover is provided with an observation hole connected to the coolant accommodating chamber, the observation hole is lower than the liquid level of the coolant in the coolant accommodating chamber, and the hub motor also includes a light-transmitting member, which closes the observation hole.

7. The in-wheel motor according to claim 4, wherein, The second end cover or the second end cover is provided with a liquid injection hole connected with the coolant accommodating chamber, and the hub motor also includes a threaded member, and the threaded member is threadedly engaged in the liquid injection hole.

8. The in-wheel motor according to claim 4, wherein Part of the vent valve is threadedly fitted into the vent hole; A receiving groove is provided on a side of the first end cover facing away from the second end cover, and the remaining part of the air-permeable valve is located in the receiving groove.

9. The in-wheel motor according to claim 4, characterized in that, The motor shaft is provided with an outlet channel, and the outlet channel is located on the side of the stator assembly away from the exhaust channel. The hub motor also includes a motor lead wire electrically connected to the stator assembly, and the motor lead wire is exposed from the outlet channel to the side of the second end cover away from the first end cover.

10. An electric vehicle, characterized in that, Comprising a wheel hub motor according to any one of claims 1-9.

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