Hub power assembly and automobile

Abstract

A kind of wheel hub power assembly and automobile.The wheel hub power assembly includes: wheel hub bearing, in wheel hub and be arranged in wheel hub central axis;The wheel hub bearing includes bearing inner ring and bearing outer ring;Shell, around the wheel hub bearing forms accommodating cavity;Wheel hub driver, in the accommodating cavity;Wherein, the first end of the bearing inner ring and first connecting piece are in contact;The second end of the bearing inner ring and the wheel hub driver are in contact;The first end of the bearing inner ring and the second end of the bearing inner ring are opposite in axial direction;The bearing outer ring is fixed on the shell.The above scheme can be used to improve the stability of wheel hub bearing, so as to improve the stability of the whole wheel hub assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a wheel hub power assembly and a vehicle. Background Art

[0002] In-wheel motor technology, also known as in-wheel motor technology, integrates the power, brake, and transmission into the wheel hub, greatly simplifying the vehicle's mechanical components. The power, brake, and transmission are integrated into the wheel hub to form the wheel hub assembly.

[0003] The wheel hub assembly's powertrain, referred to as the wheel hub powertrain, includes a wheel hub drive, which includes a motor and a reducer connected to the motor. The motor's drive torque is transmitted to the wheels via the reducer, thereby driving the wheels. The reducer reduces the motor's speed, increasing the output torque.

[0004] The wheel hub is equipped with a hub bearing, located on the hub's central axis. The inner or outer ring of the hub bearing is connected to the output of the wheel hub driver and then to the wheel hub. This allows the hub bearing to bear the dynamic load of the vehicle's rotation and also output drive torque to the wheels.

[0005] However, when existing vehicles are running, the stability of the wheel hub bearing is very poor, resulting in poor stability of the entire wheel hub assembly. Summary of the Invention

[0006] The problem to be solved by the present invention is: How to improve the stability of the wheel hub bearing, thereby improving the stability of the entire wheel hub assembly?

[0007] To solve the above problems, an embodiment of the present invention provides a wheel hub powertrain, which includes:

[0008] A wheel hub bearing is located in the wheel hub and is arranged on the central axis of the wheel hub; the wheel hub bearing includes a bearing inner ring and a bearing outer ring; the wheel hub bearing is connected to the wheel hub through a first connecting member;

[0009] a housing, forming an accommodating cavity around the hub bearing;

[0010] A wheel hub driver is located in the accommodating cavity;

[0011] The first end of the bearing inner ring abuts against the first connecting member; the second end of the bearing inner ring abuts against the wheel hub driver; the first end of the bearing inner ring and the second end of the bearing inner ring are axially opposite to each other; and the bearing outer ring is fixed to the housing.

[0012] Optionally, the first connecting member is located on the output shaft of the wheel hub driver;

[0013] The wheel hub powertrain further comprises an axial locking structure located on the output shaft of the wheel hub driver for locking the first connecting member in the axial direction.

[0014] Optionally, the first connecting member includes a first connecting portion and a second connecting portion; the first connecting portion is used to be fixedly connected to the wheel hub driver; and the second connecting portion is used to transmit the exciting force to the wheel hub bearing.

[0015] Optionally, the first connection portion is spline-connected to the wheel hub driver.

[0016] Optionally, the inner surface of the second connecting portion is a cylindrical surface.

[0017] Optionally, the wheel hub power assembly further comprises: a wheel hub bearing pressure plate, located in the gap between the wheel hub driver and the wheel hub bearing, for axially pressing the bearing outer ring.

[0018] Optionally, the wheel hub bearing pressure plate includes: a pressure plate body, and at least one notched tooth groove located on the outer periphery of the pressure plate body, adjacent notched tooth grooves are connected by a tooth groove connecting portion; a breathable groove is formed between the wheel hub bearing pressure plate and the shell; the tooth groove connecting portion is aligned with the air release valve of the wheel hub driver, and a gas channel is formed between the air release valve and the breathable groove.

[0019] Optionally, the tooth groove connection part includes: a first tooth groove connection part and a second tooth groove connection part, the outer arc length of the first tooth groove connection part is greater than the outer arc length of the second tooth groove connection part; the tooth groove connection part aligned with the air release valve is the first tooth groove connection part.

[0020] Optionally, the wheel hub driver includes: a motor, and a reducer connected to the motor; the second end of the bearing inner ring abuts against the reducer.

[0021] An embodiment of the present invention further provides an automobile, comprising the above-mentioned wheel hub powertrain.

[0022] Compared with the prior art, the technical solution of the embodiment of the present invention has the following advantages:

[0023] With the solution of the present invention, the inner ring of the wheel hub bearing abuts the first connector at its first end and the wheel hub driver at its second end. This allows the inner ring to be axially clamped by the first connector and the wheel hub driver, thereby reducing axial movement of the wheel hub bearing. Furthermore, the outer ring of the wheel hub bearing is directly fixed to the housing, securing the wheel hub bearing radially to the housing and preventing radial movement of the wheel hub bearing. Therefore, with the solution of the present invention, the wheel hub bearing is fixed both axially and radially, resulting in greater stability, thereby improving the stability of the entire wheel hub assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the position of a wheel hub powertrain;

[0025] Figure 2 is a partial structural diagram of a wheel hub power assembly according to an embodiment of the present invention;

[0026] Figure 3 1 is a right side view of a hub bearing pressure plate according to an embodiment of the present invention, wherein portion C is a radial cross-sectional view of the portion;

[0027] Figure 4 1 is a left side view of a hub bearing pressure plate according to an embodiment of the present invention;

[0028] Figure 5 yes Figure 3 Cross-sectional view along the CC direction after the middle hub bearing pressure plate is assembled. DETAILED DESCRIPTION

[0029] In existing wheel hubs, the stability of the wheel hub bearing is very poor, resulting in poor stability of the entire wheel hub assembly.

[0030] To address the above issues, embodiments of the present invention provide a wheel hub powertrain in which the inner ring of the wheel hub bearing is axially clamped by a first connector and the wheel hub driver, thereby reducing axial movement of the wheel hub bearing. Furthermore, the outer ring of the wheel hub bearing is directly fixed to the housing, thereby securing the wheel hub bearing radially and preventing radial movement of the wheel hub bearing. Therefore, the solution of the present invention secures the wheel hub bearing both axially and radially, resulting in greater stability, thereby improving the stability of the entire wheel hub assembly.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1 The embodiment of the present invention provides a wheel hub powertrain 10. One end of the wheel hub powertrain 10 is connected to a steering drive device 30 via a fork arm structure 20, and the other end is connected to the wheel hub of a wheel 40.

[0033] In actual use, when the vehicle is traveling in a straight line, the steering drive device 30 may not be activated, that is, no steering control signal is sent to the steering drive device 30. Instead, the hub powertrain 10 on the wheel 40 directly drives the motor shaft to rotate the wheel, thereby achieving straight-line travel. When the vehicle needs to turn, a steering control signal is sent to the steering drive device 30, which causes the fork arm structure 20 to rotate. The rotation of the fork arm structure 20 also causes the connected wheel 40 to rotate, thereby controlling the vehicle to rotate in different directions.

[0034] In an embodiment of the present invention, the wheel hub powertrain comprises: a wheel hub bearing, a housing and a wheel hub driver.

[0035] A wheel hub bearing is located in the wheel hub and is arranged on the central axis of the wheel hub; the wheel hub bearing includes a bearing inner ring and a bearing outer ring; the wheel hub bearing is connected to the wheel hub through a first connecting member;

[0036] a housing, forming an accommodating cavity around the hub bearing;

[0037] A wheel hub driver is located in the accommodating cavity;

[0038] The first end of the bearing inner ring abuts against the first connecting member; the second end of the bearing inner ring abuts against the wheel hub driver; the first end of the bearing inner ring and the second end of the bearing inner ring are axially opposite to each other; and the bearing outer ring is fixed to the housing.

[0039] In a specific implementation, the wheel hub driver may include: a motor and a reducer.

[0040] Wherein, the motor may include: a rotor assembly, a stator assembly and a rotor bracket. The rotor assembly is fixed to the housing. When the rotor assembly receives a driving control signal, it rotates around the stator assembly, thereby generating a driving torque. The rotor bracket supports the rotor assembly, and one end is fixedly connected to the rotor assembly, and the other end is connected to the power input end of the reducer. Thus, when the rotor assembly rotates, the rotor bracket supports the rotor assembly for synchronous rotation, thereby transmitting the driving torque to the power input end of the reducer. The power output end of the reducer is connected to the wheel hub through the outer ring of the wheel hub bearing. The reducer can amplify the drive torque generated by the motor and transmit the amplified driving torque to the wheel hub, thereby driving the wheel to rotate.

[0041] In a specific implementation, the reducer may be a planetary reducer or a reducer with other structures.

[0042] Figure 2 Schematic diagram of the partial structure of the wheel hub powertrain in an embodiment of the present invention, wherein part A is a schematic diagram of the cross-sectional structure of the part.

[0043] Taking a planetary reducer as an example, the planetary reducer may include:

[0044] The sun gear 201 serves as the input end of the planetary reducer;

[0045] A ring gear, centered on the sun gear 201;

[0046] A plurality of planetary gears 202 are arranged around the sun gear 201 and mesh with the sun gear 201 and the ring gear;

[0047] The planet carrier 203 is connected to the plurality of planetary gears 202 and serves as an output end of the planetary reducer and is connected to the hub.

[0048] In a specific implementation, sun gear 201 is fixedly connected to the motor's rotor support. Rotation of the rotor support drives the sun gear. Sun gear 201 meshes with the planetary gears within the ring gear. Therefore, rotation of sun gear 201 drives rotation of planetary gears 202. Planetary gears 202 are fixedly connected to planet carrier 203. Rotation of planetary gears 202 also drives planet carrier 203. Planet carrier 203 is connected to the wheel hub via a first connector 23. Rotation of planet carrier 203 transmits drive torque to the wheel hub, thereby driving the wheels.

[0049] In the specific implementation, refer to Figure 2 The housing 21 may be integrated with the fork arm structure. The housing 21 may form a receiving cavity with the inner housing of the motor controller, the wheel hub, and the wheel hub bearing 22. The motor and the reducer are disposed in the receiving cavity.

[0050] In a specific implementation, the hub bearing 22 includes an inner ring and an outer ring, with rolling elements disposed between the inner ring and the outer ring. The outer ring is connected to the wheel hub, and the inner ring is connected to the output end of the reducer.

[0051] Taking the reducer as a planetary reducer as an example, refer to Figure 2 The first end of the inner ring of the hub bearing 22 is connected to the wheel hub via the first connector 23, and the second end abuts against the planet carrier 203. On the inner ring of the hub bearing 21, the first end and the second end are axially opposed. The outer ring of the hub bearing 22 is fixed to the housing 21.

[0052] In a specific implementation, the outer ring of the hub bearing 22 is a non-rotating ring, while the inner ring of the hub bearing 22 is a rotating ring. The outer ring of the hub bearing 22 can be interference-fitted with the housing 21 and directly fixed to the housing 21, with the housing 21 radially clamping the outer ring of the hub bearing 22. When the first connecting member 23 is subjected to impact and vibration from the ground, the excitation force is directly transmitted to the hub bearing 22, which then transmits the excitation force to the housing 21.

[0053] At this time, on the one hand, the housing 21 can clamp the outer ring of the hub bearing 21 in the radial direction, reducing the radial runout of the hub bearing 22 and improving the stability of the hub bearing. On the other hand, the housing 21 can disperse and bear the exciting force, thereby improving the strength of the housing 21 itself. Ultimately, the stability of the entire hub assembly is improved.

[0054] In the specific implementation, refer to Figure 2 , the first connecting member 23 can be located on the output shaft of the wheel hub driver.

[0055] In one embodiment, to better transmit the exciting force, the first connecting member 23 can be sleeved outside the planet carrier 203 and fixedly connected to the planet carrier 203. In this case, the first connecting member 23 can include two parts along the axial direction: a first connecting portion 231 and a second connecting portion 232. The first connecting portion 231 is used for fixed connection to the wheel hub driver; the second connecting portion 232 is used to transmit the exciting force to the wheel hub bearing 22.

[0056] In one embodiment, the first connecting portion 231 and the planet carrier 203 can be splined to secure the first connecting member 23 to the planet carrier 203 and achieve synchronous rotation. For example, the outer circumference of the planet carrier 203 can be provided with a plurality of external teeth at positions corresponding to the first connecting portion 231. The inner circumference of the first connecting portion 231 can be provided with a groove, and the inner circumference of the groove can be provided with internal teeth. During connection, the external teeth on the outer circumference of the planet carrier 203 can penetrate into the groove to form a spline connection with the internal teeth.

[0057] In one embodiment, the inner surface of the second connecting portion 232 may be a smooth cylindrical surface, and the cylindrical surface may fit with the first connecting member, thereby making it easier to transmit the exciting force.

[0058] In a specific implementation, a corresponding groove can be provided on the housing 21 at a position corresponding to the outer ring of the hub bearing 22 , so as to cover the outer ring of the hub bearing 22 and fix the hub bearing 22 in the radial direction.

[0059] In a specific implementation, the first connecting member 23 can be an annular member, specifically a hub flange shaft, which has the above-mentioned first connecting portion and second connecting portion. The hub flange shaft can be fixed to the hub by bolts.

[0060] In a specific implementation, the diameter of the first connecting portion 231 can be larger than that of the second connecting portion 232, so that the first connecting portion 231 and the second connecting portion 232 have a radial step, the first end of the hub bearing 22 abuts against the step, and the second end abuts against the planetary carrier, thereby achieving axial fixation of the hub bearing 22.

[0061] In one embodiment of the present invention, in order to further improve the axial stability of the wheel hub bearing 22, the wheel hub power assembly may further include: an axial locking structure 24, located on the output shaft of the wheel hub driver, axially locking the first connecting member 23, thereby further fixing the wheel hub bearing 22 in the axial direction.

[0062] In a specific implementation, the axial locking structure 24 can be a locking nut. Correspondingly, a thread is provided at a corresponding position of the planet carrier 203 , and the first connecting member 23 is locked by the locking nut and the thread.

[0063] In one embodiment of the present invention, in order to further improve the axial stability of the hub bearing 22, the hub power assembly may further include: a hub bearing pressure plate 25, located in the gap between the hub driver and the hub bearing 22, for axially pressing the bearing outer ring.

[0064] Specifically, the hub bearing 22 is located in the gap between the planet carrier 203 and the outer ring of the hub bearing 22. The hub bearing pressure plate 25 can be fixed on the housing 21 to axially press the outer ring of the hub bearing 22.

[0065] In one embodiment of the present invention, the wheel hub bearing pressure plate 25 includes: a pressure plate body, and at least one notched tooth groove located on the outer periphery of the pressure plate body, adjacent notched tooth grooves are connected by a tooth groove connecting portion; a breathable groove is formed between the wheel hub bearing pressure plate and the shell; the tooth groove connecting portion is aligned with the air release valve of the wheel hub driver, and a gas channel is formed between the air release valve and the breathable groove.

[0066] Because the bleed valve is aligned with the tooth-groove connection and forms a gas passage between the vent groove, when oil is present at the bleed valve, the tooth-groove connection can block the oil, preventing it from rushing into the reducer. Even if oil enters the gas passage, it will slide down within the gas passage under the action of gravity. At the same time, when the air pressure in the reducer increases, the gas can enter the gas passage through the notched tooth groove and then be discharged through the bleed valve, maintaining the air pressure balance inside and outside the reducer, ensuring air permeability while preventing oil leakage.

[0067] That is to say, the hub bearing pressure plate 25 in the present invention can, on the one hand, axially compress the hub bearing 22, and on the other hand, simultaneously serve as a degassing structure of the reducer, thereby saving layout space and cost.

[0068] Figure 3 It is a right side view of the hub bearing pressure plate, wherein part B is a cross-sectional view of the hub bearing pressure plate along the radial direction. Figure 4 It is a left side view of the wheel hub bearing pressure plate. Figure 5 for Figure 3 Cross-sectional view along CC direction after the middle hub bearing pressure plate is assembled. Figure 5 In the figure, the motor, hub bearing and other structures on both sides of the reducer ventilation device are omitted.

[0069] The following combination Figures 3 to 5 , the hub bearing pressure plate is described in detail:

[0070] Reference Figure 3 and Figure 4 The hub bearing pressure plate 25 includes a pressure plate body 251 and at least one notched tooth groove 252 located on the outer periphery of the pressure plate body 251. Adjacent notched tooth grooves 252 are connected by tooth groove connecting portions 253. There is no notched tooth groove on the tooth groove connecting portion 253.

[0071] Reference Figure 3 and Figure 5 A breathable groove 254 is formed between the hub bearing pressure plate 25 and the housing 21 ; the air release valve 255 is aligned with the tooth groove connecting portion 253 , and a gas channel is formed between the air release valve 255 and the breathable groove 254 .

[0072] In a specific embodiment, the shape of the hub bearing pressure plate 25 matches the shape of the accommodating cavity. The edge of the hub bearing pressure plate 25, namely the sidewall of the tooth-groove connecting portion 253, can abut against the housing 21 and form an interference fit with the housing 21, thereby fixing the hub bearing pressure plate 25 in the accommodating cavity.

[0073] In one embodiment of the present invention, referring to Figure 2 and Figure 3 The hub bearing pressure plate 25 is an annular member, and its cross-sectional shape in the radial direction is circular, so that the hub bearing pressure plate 25 is provided with a side wall 256 (such as Figure 4 As shown in the figure, the cylindrical surface is interference fit with the housing 21, thereby preventing the oil at the air release valve 255 from entering the reducer through the gap between the cylindrical surface and the housing 21.

[0074] In a specific implementation, the outer periphery of the pressure plate body 251 may be provided with only one notched tooth groove 252, or may be provided with two or more notched tooth grooves 252. Adjacent notched tooth grooves 252 are connected by tooth groove connecting portions 253. For example, the number of notched tooth grooves 252 may be 9.

[0075] In a specific implementation, the notched tooth grooves 252 are distributed along the axial direction of the pressure plate body 25251 and penetrate the pressure plate body 251. When the number of notched tooth grooves 252 is two or more, the gas in the reducer can enter the gas channel through any one or more notched tooth grooves 252. The depth of the notched tooth grooves 252 can be set according to actual needs and is not limited here. The depths of the notched tooth grooves 252 can be the same or different and are not limited here.

[0076] In a specific implementation, when two or more notched tooth grooves 252 are provided on the outer circumference of the pressure plate body 251, the distances between adjacent notched tooth grooves 252 can be the same or different. For example, in the case of a hub bearing pressure plate 25 having a circular cross-section in the radial direction, the outer arc lengths of the tooth groove connecting portions 253 between adjacent notched tooth grooves 252 can be the same or different.

[0077] In one embodiment, in order to better block the oil at the air release valve 255, the tooth groove connection portion includes: a first tooth groove connection portion 253a and a second tooth groove connection portion 253b, the outer arc length of the first tooth groove connection portion 253a is greater than the outer arc length of the second tooth groove connection portion 253b; the tooth groove connection portion aligned with the air release valve 255 is the first tooth groove connection portion 253a.

[0078] In a specific implementation, the air release valve 255 can be installed on the housing 21 at the highest point corresponding to the hub bearing pressure plate 25. Specifically, the mounting hole of the air release valve 255 can be aligned with the middle position of the first tooth groove connecting portion 253a. In this way, the first tooth groove connecting portion 253a can symmetrically block the oil at the air release valve 255 from two directions to prevent the oil from entering the reducer.

[0079] In a specific implementation, the outer arc lengths of the second tooth groove connecting portions 253b can be set to be the same. The outer arc length of the first tooth groove connecting portion 253a is twice or more than the outer arc length of the second tooth groove connecting portion 253b. For example, the outer arc length of the first tooth groove connecting portion 253a is three times the outer arc length of the second tooth groove connecting portion 253b.

[0080] In a specific implementation, a breathable groove is formed between the hub bearing pressure plate 25 and the housing 21. The breathable groove includes two parts: one part is the first gap between the first tooth groove connecting portion 253a and the housing 21, and the other part is the second gap between the hub bearing pressure plate body 251 and the housing 21. The first gap is usually larger than the second gap. Figure 3 Even if the oil enters from the bleed valve 255, it can flow from the first gap into the second gap under the action of gravity and eventually slide down to the lowest point of the hub bearing pressure plate in the radial direction.

[0081] In a specific embodiment, the pressure plate body 251 has a central through-hole 256, giving the pressure plate body 251 a hollow, annular structure. The power output of the reducer is connected to the hub bearing via the central through-hole 256. The central through-hole 256 allows the power output of the reducer (e.g., the planetary carrier) to be out of the way. The shape of the central through-hole 256 can be customized according to actual needs.

[0082] In the specific implementation, refer to Figure 5 The peripheral structure formed by the notched tooth groove 252 and the tooth groove connecting portion 253 can protrude from the pressure plate body 251 in the axial direction toward the motor controller to better fit with the housing 21 and form a breathable groove 254. The entire hub bearing pressure plate 25 can be formed in one piece.

[0083] In one embodiment of the present invention, the pressure plate body 251 can be arranged to cover the outer ring of the hub bearing in the axial direction and expose the inner ring of the hub bearing. Specifically, the inner diameter of the pressure plate body 251 can be set according to the position of the hub bearing, so that the hub bearing pressure plate body 251 can axially press the outer ring of the hub bearing, acting as a hub bearing pressure plate. This eliminates the need for an additional hub bearing pressure plate, reduces costs, and simplifies the hub powertrain structure.

[0084] In a specific implementation, the wheel hub drive assembly may further include an oil plug 257 located on the housing 21, corresponding to the lowest radial point of the wheel hub bearing pressure plate. After removing the oil plug 257, the reducer can be filled with oil. The oil that enters the first gap can then slide down to the oil filling position.

[0085] In a specific implementation, the pressure plate body 251 is provided with a plurality of mounting holes 258 for fixing the hub bearing pressure plate 25 to the housing 21. Specifically, the hub bearing pressure plate 25 can be fixed to the housing 21 by using countersunk screws through the mounting holes 258.

[0086] In the specific implementation, refer to Figure 3A plurality of gear ring mounting structures 259 can also be provided on the tooth groove connection portion. The gear ring of the planetary reducer can be connected to the hub bearing pressure plate 25 through the gear ring mounting structure 259, and the planetary carrier of the planetary reducer passes through the central through hole of the hub bearing pressure plate body 251 and is connected to the hub bearing.

[0087] During installation, the air release valve 255 and oil plug 257 can be first installed on the housing 21. Then, the first tooth groove connection portion of the hub bearing pressure plate 25 is aligned with the air release valve 255, and the hub bearing pressure plate is installed through the mounting hole 258. The installation process is convenient. In addition, the hub bearing pressure plate has a simple structure and is easy to manufacture, which not only maintains ventilation but also prevents oil leakage.

[0088] It can be seen from the above content that in the wheel hub power assembly in the embodiment of the present invention, the wheel hub bearing is not only fixed in the axial direction, but also fixed in the radial direction, so the wheel hub bearing has better stability, thereby improving the stability of the entire wheel hub assembly.

[0089] An embodiment of the present invention further provides a car, which may include any one of the above-mentioned wheel hub powertrains.

[0090] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A wheel hub powertrain, characterized in that: include: A wheel hub bearing is located in the wheel hub and is arranged on the central axis of the wheel hub; the wheel hub bearing includes a bearing inner ring and a bearing outer ring; the wheel hub bearing is connected to the wheel hub through a first connecting member; a housing, forming an accommodating cavity around the hub bearing; A wheel hub driver is located in the accommodating cavity; and a wheel hub bearing pressure plate, located in the gap between the wheel hub driver and the wheel hub bearing, for axially pressing the bearing outer ring; The first end of the bearing inner ring abuts against the first connecting member; the second end of the bearing inner ring abuts against the wheel hub driver; the first end of the bearing inner ring and the second end of the bearing inner ring are axially opposite; and the bearing outer ring is fixed to the housing; The wheel hub bearing pressure plate comprises: a pressure plate body, and at least one notched tooth groove located on the outer periphery of the pressure plate body, adjacent notched tooth grooves being connected by a tooth groove connecting portion; a breathable groove is formed between the wheel hub bearing pressure plate and the housing; the tooth groove connecting portion is aligned with the air release valve of the wheel hub driver, and a gas channel is formed between the air release valve and the breathable groove; The tooth groove connection part includes: a first tooth groove connection part and a second tooth groove connection part, the outer arc length of the first tooth groove connection part is greater than the outer arc length of the second tooth groove connection part; the tooth groove connection part aligned with the air release valve is the first tooth groove connection part.

2. The wheel hub powertrain according to claim 1, wherein: The first connecting member is located on the output shaft of the wheel hub driver; The wheel hub powertrain further comprises an axial locking structure located on the output shaft of the wheel hub driver for locking the first connecting member in the axial direction.

3. The wheel hub powertrain according to claim 2, wherein: The first connecting member includes a first connecting portion and a second connecting portion; the first connecting portion is used for fixed connection with the wheel hub driver; and the second connecting portion is used for transmitting exciting force to the wheel hub bearing.

4. The wheel hub powertrain according to claim 3, characterized in that: The first connection portion is spline-connected to the wheel hub driver.

5. The wheel hub powertrain according to claim 3, wherein: The inner surface of the second connecting portion is a cylindrical surface.

6. The wheel hub powertrain according to claim 1, wherein: The wheel hub driver includes: a motor and a reducer connected to the motor; the second end of the bearing inner ring abuts against the reducer.

7. An automobile, characterized in that: A wheel hub power assembly comprising any one of claims 1 to 6.

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