Electric wheel hub

Abstract

The present invention relates to an electric wheel hub. The electric wheel hub comprises a driving wheel shell, a driven wheel shell connected to the driving wheel shell, a hub shaft penetrating through the driving wheel shell and the driven wheel shell, an accommodation space surrounded and defined by inner walls of the driving wheel shell and the driven wheel shell, a driving assembly disposed within the accommodation space, and a heat dissipation mechanism used for dissipating heat from the accommodation space. The driving assembly comprises a driving motor mounted on one side of the hub shaft and a transmission assembly disposed within the accommodation space. The driving motor drives, via the transmission assembly, the driving wheel shell to rotate about the hub shaft. According to the present invention, electric rotation of the wheel hub about the hub shaft is achieved by means of an internal driving motor that drives the wheel hub via the transmission assembly. This structural design effectively enables stable and reliable assembly of the wheel hub with external components and ensures coaxiality between the wheel hub and the hub shaft, thereby improving the balance and stability of rotation of the wheel hub. In addition, a heat dissipation function is further provided.

Description

An electric wheel hub TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric wheel hub. BACKGROUND

[0002] Wheel hub motor technology is also known as in-wheel motor technology, and its greatest feature is that the power device, transmission device and brake device are integrated together into the wheel hub, thereby greatly simplifying the mechanical part of the electric vehicle. In the patent with the patent application number 201810099024.5 and the patent name of a servo wheel hub motor, the rotor and stator components of the motor are installed in the wheel hub, and the output shaft of the motor only extends on one side of the wheel hub and is connected with the outside. The patent has the following defects: 1. Only one end of the main shaft of the wheel hub is connected with the outside, which causes the wheel hub to be subjected to force on only one side during rotation, resulting in uneven force on the wheel hub and easy occurrence of wheel hub shaking during rotation, and the balance and stability of the wheel hub are poor. 2. The rotor and stator of the motor are likely to heat up during long-time operation in the wheel hub, which may cause the wheel hub electronics to catch fire and pose a safety hazard. Therefore, the defects are obvious, and a solution is urgently needed. SUMMARY

[0003] In order to solve the above technical problems, the purpose of the present application is to provide an electric wheel hub in which the motor is built into the wheel hub, the wheel hub shaft can penetrate through both sides of the wheel hub, and the wheel hub has a heat dissipation function.

[0004] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0005] An electric wheel hub comprises a driving wheel shell, a driven wheel shell connected to the driving wheel shell, a wheel hub shaft penetrating through the driving wheel shell and the driven wheel shell, a containing space surrounded by the inner walls of the driving wheel shell and the driven wheel shell, a driving assembly arranged in the containing space, and a heat dissipation mechanism for dissipating heat from the containing space. The driving assembly comprises a driving motor arranged on one side of the wheel hub shaft and a transmission assembly arranged in the containing space. The driving motor drives the driving wheel shell to rotate around the wheel hub shaft through the transmission assembly.

[0006] Further, the heat dissipation structure comprises exhaust holes and air inlet holes arranged on the driving wheel shell and / or the driven wheel shell, and the exhaust holes and the air inlet holes are in communication with the containing space.

[0007] Still further, the exhaust holes and the air inlet holes are arranged on the side wall of the driven wheel shell, one side of the exhaust hole is provided with a wind guide block, one side of the wind guide block is connected with the side wall of the exhaust hole, and the other side of the wind guide block protrudes into the containing space and is arranged obliquely.

[0008] Further, the distance between the center of the exhaust hole and the center of the hub shaft is greater than the distance between the center of the intake hole and the center of the hub shaft.

[0009] Further, the transmission assembly comprises a gear ring connected with the driving wheel shell, a first transmission gear arranged on the output shaft of the driving motor, a gear shaft arranged in the accommodating space, a second transmission gear arranged on the gear shaft, and a third transmission gear arranged on the gear shaft, the first transmission gear is engaged with the second transmission gear, and the third transmission gear is engaged with the gear ring.

[0010] Further, the electric hub further comprises a dustproof mechanism for dustproofing the transmission assembly; the dustproof mechanism comprises a first dustproof cover and a second dustproof cover arranged in the accommodating space, the first dustproof cover is used for covering the upper part of the output shaft of the driving motor, the first transmission gear, the second transmission gear, the third transmission gear and the gear ring, and the second dustproof cover is used for covering the lower part of the gear ring.

[0011] Further, the first dustproof cover, the second dustproof cover and the driving wheel shell surround a dustproof space, the driving motor is located outside the dustproof space, and the output end of the driving motor and the transmission assembly are located in the dustproof space; a sealing element is arranged between the side edge of the first dustproof cover, the side edge of the second dustproof cover and the inner wall of the driving wheel shell.

[0012] Further, the electric hub further comprises a fixing seat arranged in the accommodating space and connected with the hub shaft, the fixing seat is provided with a shaft sleeve matched with the hub shaft, the fixing seat is provided with a motor mounting cavity for mounting and fixing the driving motor, and the fixing seat is provided with an axle hole for mounting and fixing the gear shaft; a ventilation hole is arranged at the top of the motor mounting cavity; the first dustproof cover is connected to the top of the fixing seat, and the first dustproof cover is provided with a gear accommodating cavity for accommodating the first transmission gear, the second transmission gear, the third transmission gear and the gear shaft; the second dustproof cover is connected with the fixing seat and located below the first dustproof cover.

[0013] Further, the electric hub further comprises a light emitting assembly, the light emitting assembly comprises a light emitting element, a circuit board, a coil and a circular ring-shaped magnetic core, the circuit board and the coil are annular; the circular ring-shaped magnetic core is fixedly arranged on the hub shaft, the circuit board and the coil are arranged on the driving wheel shell, the circular ring-shaped magnetic core is located on the inner side of the circuit board, the coil is arranged on the inner side of the circuit board and located between the circuit board and the circular ring-shaped magnetic core; the light emitting element is arranged on the driving wheel shell and electrically connected with the circuit board.

[0014] The hub shaft of the present application is through the two sides of the driving wheel shell and the driven wheel shell, the driving motor is arranged on one side of the hub shaft, and the output shaft of the driving motor drives the driving wheel shell and the driven wheel shell to rotate around the hub shaft through the transmission assembly, so that the function of the electric hub is realized. The design of the structure is different from the traditional hub motor structure in that the hub shaft can penetrate the two sides of the hub, and the hub shaft is a fixed shaft connected with the outside, not a driving shaft. The design of the structure can solve the defect that the existing hub motor can only be connected with the outside on one side, on the other hand, the penetration design of the hub shaft can effectively make the assembly of the hub and the external parts more stable and reliable, and ensure the coaxiality between the hub and the hub shaft, thereby improving the balance and stability of the hub rotation. At the same time, the electric hub also has a heat dissipation mechanism which can discharge the heat in the hub, so that the temperature in the hub will not be too high, thereby improving the use stability of the electric hub. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a schematic view of the structure of the present application.

[0016] Fig. 2 is a schematic view of the exploded structure of the present application.

[0017] Fig. 3 is a full sectional view of the present application.

[0018] Fig. 4 is a front view of the driven wheel shell of the present application.

[0019] Fig. 5 is a sectional view along the direction A-A in Fig. 4.

[0020] Fig. 6 is a schematic view of the structure of the present application hidden from the driven wheel shell.

[0021] Fig. 7 is a schematic view of the structure of the transmission assembly of the present application.

[0022] Fig. 8 is a schematic view of the structure of the present application hidden from the driving wheel shell.

[0023] Fig. 9 is a schematic view of the structure of the fixing seat of the present application.

[0024] Fig. 10 is a schematic view of the structure of the second dust cover of the present application.

[0025] Fig. 11 is a schematic view of the structure of the light emitting assembly and the driving wheel shell of the present application.

[0026] Fig. 12 is a schematic view of the structure of the first dust cover and the fixing seat of the present application.

[0027] Explanation of reference signs:

[0028] 1, active wheel shell; 2, driven wheel shell; 3, containing space; 4, exhaust hole; 401, air guide block; 5, air inlet; 6, drive motor; 7, hub shaft; 8, fixed seat; 801, shaft sleeve; 802, motor mounting cavity; 803, shaft hole; 804, air hole; 9, gear containing cavity; 10, dustproof space; 11, gear ring; 12, third transmission gear; 13, gear shaft; 14, first transmission gear; 15, second transmission gear; 17, first dustproof cover; 18, second dustproof cover; 181, containing groove; 19, light emitting element; 20, circuit board; 21, containing cavity; 22, tire; 23, circular ring magnetic core; 24, wire. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of those skilled in the art, the present application is further illustrated below in conjunction with the embodiments and the accompanying drawings, and the content mentioned in the embodiments is not a limitation of the present application.

[0030] As shown in FIGS. 1-11, the electric hub provided by the present application comprises an active wheel shell 1, a driven wheel shell 2 connected to the active wheel shell 1, a hub shaft 7 penetrating through the active wheel shell 1 and the driven wheel shell 2, a containing space 3 surrounded by the inner walls of the active wheel shell 1 and the driven wheel shell 2, a drive assembly arranged in the containing space 3, and a heat dissipation mechanism for dissipating heat from the containing space 3. The drive assembly comprises a drive motor 6 arranged on one side of the hub shaft 7 and a transmission assembly arranged in the containing space 3. The drive motor 6 drives the active wheel shell 1 to rotate around the hub shaft 7 through the transmission assembly. The active wheel shell 1 and the driven wheel shell 2 are combined together to form a hub rotating around the hub shaft 7. The outer circumferences of the active wheel shell 1 and the driven wheel shell 2 are provided with tires 22.

[0031] In the technical solution, the hub shaft 7 penetrates through both sides of the active wheel shell 1 and the driven wheel shell 2. The drive motor 6 is arranged on one side of the hub shaft 7. The output shaft of the drive motor 6 drives the active wheel shell 1 and the driven wheel shell 2 to rotate around the hub shaft 7 through the transmission assembly, thereby realizing the function of the electric hub. Preferably, the hub shaft 7 is coaxially arranged with the active wheel shell 1 and the driven wheel shell 2. The difference between the structure of the present application and the conventional electric hub structure lies in that the hub shaft 7 can penetrate through both sides of the hub, and the hub shaft 7 is a fixed shaft connected to the outside, rather than a driving shaft. In actual application, only the two ends of the hub shaft 7 are fixedly connected to external parts. The rotation of the active wheel shell 1 and the driven wheel shell 2 driven by the drive motor 6 and the transmission assembly can drive the movement of the external parts. The design of the structure can solve the defect that the existing hub motor can only be connected to the outside on one side. On the other hand, the penetration design of the hub shaft 7 can effectively make the assembly of the hub and the external parts more stable and reliable, and also ensure the coaxiality between the hub and the hub shaft 7, thereby improving the balance and stability of the hub rotation.

[0032] Meanwhile, the electric wheel hub is also provided with a heat dissipation mechanism. Since the driving motor 6 is built in the wheel hub, the driving motor 6 will heat up when working, and the heat in the wheel hub will be too high to cause the driving motor 6 to burn out or even cause the wheel hub to catch fire. Therefore, the heat dissipation mechanism of the electric wheel hub can discharge the heat in the wheel hub, so that the temperature in the wheel hub will not be too high, thereby improving the use stability of the electric wheel hub.

[0033] In this embodiment, as shown in FIGS. 1-3, the heat dissipation structure includes exhaust holes 4 and air inlet holes 5 arranged on the driving wheel shell 1 and / or the driven wheel shell 2, which are in communication with the accommodation space 3. In actual application, when the driving motor 6 works, a large amount of heat will be accumulated in the accommodation space 3. When the driving wheel shell 1 and the driven wheel shell 2 work, the exhaust holes 4 and the air inlet holes 5 in communication with the outside allow the accommodation space 3 to continuously intake and exhaust air from the outside, thereby forming a circulating air flow to take the heat in the accommodation space 3 out of the wheel hub, so as to achieve the effect of heat dissipation in the wheel hub, avoiding the problem of motor burnout or wheel hub fire caused by excessive heat in the wheel hub.

[0034] In this embodiment, as shown in FIGS. 3-5, the exhaust holes 4 and the air inlet holes 5 are arranged on the side wall of the driven wheel shell 2, and one side of the exhaust hole 4 is provided with a wind guide block 401, one side of which is connected with the side wall of the exhaust hole 4, and the other side of which protrudes into the accommodation space 3 and is arranged obliquely. The design of the wind guide block 401, on the one hand, when the driven wheel shell 2 rotates, the wind guide block 401 forms a wind scraping plate in the accommodation space 3, which takes the hot air in the accommodation space 3 out of the wheel hub through the exhaust hole 4; on the other hand, it also increases the exhaust capacity and exhaust speed of the exhaust hole 4, thereby improving the heat dissipation efficiency. Its structure design is simple and compact, and the heat dissipation effect is good. In actual application, when the driven wheel shell 2 rotates, the air flow outside the driven wheel shell 2 will quickly flow out of the accommodation space 3 along the wind guide block 401 of the exhaust hole 4, so that the heat in the accommodation space 3 is taken out synchronously, and the air pressure in the accommodation space 3 is lower than the external atmospheric pressure. Under the action of atmospheric pressure, air can also quickly flow into the accommodation space 3 from the air inlet hole 5, thereby forming a circulating air flow in the wheel hub.

[0035] Since the driving motor 6 itself has a mechanism for exhausting and dissipating heat, the hot air flow discharged by the driving motor 6 into the accommodation space 3 will cause the air in the accommodation space 3 to form a turbulent air flow. The design of the exhaust hole 4 and the air inlet hole 5 of the driven wheel shell 2 forms a circulating outward air flow in the accommodation space 3, so that the heat in the accommodation space 3 is continuously discharged outward, thereby efficiently dissipating heat.

[0036] As preferred, as shown in FIG. 1 and FIG. 4, the distance between the center of the exhaust hole 4 and the center of the wheel hub shaft 7 is greater than the distance between the center of the intake hole 5 and the center of the wheel hub shaft 7. There are multiple intake holes 5, and multiple exhaust holes 4 are arranged in a circumferential array around the center of the driven wheel shell 2. The farther the position is from the center of the wheel hub shaft 7, the faster the linear speed of the wheel hub when rotating, so that arranging the exhaust hole 4 at a position farther from the center of the wheel hub shaft 7 can make the air in the accommodation space 3 be able to be quickly exhausted, so that a pressure difference is formed between the accommodation space 3 and the atmospheric pressure, facilitating the external gas to enter the accommodation space 3 through the intake hole 5, and forming a circulating air flow in the accommodation space 3, which continuously brings low-temperature gas and takes away high-temperature gas, achieving the effect of heat dissipation.

[0037] In actual application, since the upper end and the lower end of the driving motor 6 are provided with air inlets, the upper end and the lower end of the driving motor 6 are provided with air outlets, and the air outlet is provided with an exhaust fan for heat dissipation of the driving motor 6; the hot air exhausted by the driving motor 6 can cause the formation of turbulent air flow in the accommodation space 3. Therefore, the heat dissipation structure can form a stable circulating air flow from the turbulent air flow in the accommodation space 3, and take out the heat to the outside of the wheel hub, so as to avoid the heat in the accommodation space 3 being too high.

[0038] In the technical solution, as shown in FIG. 2 and FIG. 3, the transmission assembly includes a gear ring 11 connected with the driving wheel shell 1, a first transmission gear 14 arranged on the output shaft of the driving motor 6, a gear shaft 13 arranged in the accommodation space 3, a second transmission gear 15 rotatably arranged on the gear shaft 13, and a third transmission gear 12 rotatably arranged on the gear shaft 13, the second transmission gear 15 is connected with the third transmission gear 12, the first transmission gear 14 is engaged with the second transmission gear 15, and the third transmission gear 12 is engaged with the gear ring 11. As preferred, the axis of the gear ring 11 is parallel to the axis of the wheel hub shaft 7, and the axis of the gear shaft 13 is parallel to the axis of the output shaft of the driving motor 6. The first transmission gear 14 and the second transmission gear 15 adopt external gear transmission, and the third transmission gear 12 and the gear ring 11 adopt bevel gear transmission. In actual application, the driving motor 6 drives the first transmission gear 14 to rotate, the rotating first transmission gear 14 drives the second transmission gear 15 to rotate, the rotating second transmission gear 15 drives the third transmission gear 12 to rotate, the rotating gear shaft 13 drives the third transmission gear 12 to rotate, and the rotating third transmission gear 12 drives the gear ring 11 to rotate, and further drives the driving wheel shell 1 to rotate. The structure is simple and compact, and stable and reliable in operation.

[0039] In the technical solution, as shown in FIG. 2 and FIG. 6, the electric wheel hub further comprises a dustproof mechanism for dustproofing the transmission assembly; the dustproof mechanism comprises a first dustproof cover 17 and a second dustproof cover 18 arranged in the accommodation space 3, the first dustproof cover 17 is used for covering the upper part of the output shaft of the driving motor 6, the first transmission gear 14, the second transmission gear 15, the third transmission gear 12 and the ring gear 11, and the second dustproof cover 18 is used for covering the lower part of the ring gear 11. The first dustproof cover 17 and the second dustproof cover 18 can block the external dust brought by the airflow in the accommodation space 3 and the dust discharged by the carbon brush in the driving motor 6, effectively protecting the efficient operation of the transmission assembly and improving the operation stability of the wheel hub.

[0040] As a preferred, as shown in FIG. 10, the second dustproof cover 18 is provided with an accommodation groove 181 for accommodating the ring gear 11. When the second dustproof cover 18 is installed with the driving wheel shell 1, the accommodation groove 181 can fully surround the lower part of the ring gear 11 to protect it from dust.

[0041] In the technical solution, as shown in FIG. 2, FIG. 6 and FIG. 9, the electric wheel hub further comprises a fixing seat 8 arranged in the accommodation space 3 and connected with the wheel hub shaft 7, and the first dustproof cover 17 and the second dustproof cover 18 are respectively arranged on the fixing seat 8; the fixing seat 8 is provided with a shaft sleeve 801 matched with the wheel hub shaft 7, the fixing seat 8 is provided with a motor mounting cavity 802 for mounting and fixing the driving motor 6, and the fixing seat 8 is provided with an axle hole 803 for mounting and fixing the gear shaft 13; the top of the motor mounting cavity 802 is provided with a ventilation hole 804. The fixing seat 8 is fixedly installed on the wheel hub shaft 7 through the shaft sleeve 801, the driving motor 6 is fixedly installed on the wheel hub shaft 7 through the motor mounting cavity 802, and the gear shaft 13 is fixedly installed on the wheel hub shaft 7 through the axle hole 803, so that the driving motor 6 and the transmission assembly can be stably fixed in the accommodation space 3. The ventilation hole 804 at the top of the motor mounting cavity 802 is used for air inlet of the upper end of the driving motor 6.

[0042] In the technical solution, the first dustproof cover 17 is connected to the top of the fixing seat 8, the first dustproof cover 17 is provided with a gear accommodating cavity 9 for accommodating the first transmission gear 14, the second transmission gear 15, the third transmission gear 12 and the gear shaft 13, and the second dustproof cover 18 is connected with the fixing seat 7 and located below the first dustproof cover 17. Specifically, the output shaft of the driving motor 6 is connected with the first transmission gear 14 in the gear accommodating cavity. The inner wall of the driving wheel shell 1 encloses the gear accommodating cavity 9 to form a gear box, so that the first dustproof cover also functions as a gear box.

[0043] In the technical solution, as shown in Fig. 3, the first dust cover 17 and the second dust cover 18 and the inner wall of the driving wheel shell 1 form a dustproof space 10, the driving motor 6 is located outside the dustproof space 10, and the output shaft of the driving motor 6, the first transmission gear 14, the second transmission gear 15, the third transmission gear 12 and the upper part of the ring gear 11 are all located in the dustproof space 10. Specifically, the first dust cover 17 and the second dust cover 18 are combined into a dust cover, as shown in Fig. 3, the driving wheel shell 1, the ring gear 11, the dust cover and the driving motor 6 are sequentially arranged along the wheel hub shaft 7 from right to left. The dust cover is connected with the fixed seat, and the ring gear 11 is arranged on the inner side wall of the driving wheel shell 1. The driving motor 1 is arranged on the fixed seat 8, the body of the driving motor 1 is located outside the dust cover, and the output shaft of the driving motor 1 and the first transmission gear 14 protrude into the dust cover. The design of the first dust cover 17 and the second dust cover 18 can effectively prevent the turbulent gas and pollutants discharged from the body of the driving motor 1 from entering the dustproof space 10, prevent the transmission assembly from being polluted by the pollutants from the outside to affect the transmission precision and efficiency, thereby reducing the wear of the transmission assembly and improving the use quality of the electric wheel hub.

[0044] In the technical solution, as shown in Fig. 12, a sealing element 25 is arranged between the side edge of the first dust cover 17 and the side edge of the second dust cover 18 and the inner wall of the driving wheel shell 1. Specifically, due to the assembly relationship, there is a small gap between the side edge of the dust cover and the inner wall of the driving wheel shell 1, but the gap is very small, and basically the pollutants cannot pass through the gap to enter the dustproof space 10. If necessary, a sealing element 25 can also be arranged in the gap between the first dust cover 17, the second dust cover 18 and the inner wall of the driving wheel shell 1. The sealing element 25 can be a sealing paste, a dustproof brush, a sealing gasket and a liquid sealant. The design of the structure can further provide the sealing performance of the dustproof space 10.

[0045] In the technical solution, as shown in Fig. 11, the electric wheel hub further comprises a light emitting assembly, the light emitting assembly comprises a light emitting element 19, a circuit board 20, a coil (not shown in the figure) and a circular ring-shaped magnetic core 23, the circuit board 20 and the coil are annular; the circular ring-shaped magnetic core 23 is fixedly arranged on the wheel hub shaft 7, the circuit board 20 and the coil are arranged on the driving wheel shell 1, the circular ring-shaped magnetic core 23 is located on the inner side of the circuit board 20, the coil is arranged on the inner side of the circuit board 20 and located between the circuit board 20 and the circular ring-shaped magnetic core 23; the light emitting element 19 is arranged on the driving wheel shell 1 and electrically connected with the circuit board 20. In actual application, the rotating driving wheel shell 1 drives the circuit board 20 to rotate, the rotating circuit board 20 drives the coil to rotate around the circular ring-shaped magnetic core 23, the circular ring-shaped magnetic core 23 moves to cut the magnetic induction lines, the circuit board 20 is electrified, and then the light emitting element 19 is electrified to emit light, so that the outer circular edge of the wheel hub can emit a dazzling light effect.

[0046] Specifically, the number of the light emitting pieces 19 is multiple, and the multiple light emitting pieces 19 are respectively connected with the circuit board 20 through the electric wires 24; the electric wires 24 are attached on the inner wall of the driving wheel shell 1 to prevent the electric wires 24 from interfering with the gear ring 11. The outer circular edge of the driving wheel shell 1 is provided with accommodating cavities 21, the number of the accommodating cavities 21 is multiple, and the multiple accommodating cavities 21 are arranged in an array around the outer circular edge of the driving wheel shell 1. The light emitting pieces 19 are installed in the accommodating cavities 21.

[0047] All the technical features in the embodiment can be freely combined according to actual needs.

[0048] The above embodiment is a preferred implementation scheme of the present application, and the present application can also be implemented in other manners, and any obvious replacement without departing from the technical scheme concept is within the protection scope of the present application.

Claims

1. An electric wheel hub, characterized by: The electric wheel hub comprises a driving wheel shell (1), a driven wheel shell (2) connected to the driving wheel shell (1), a wheel hub shaft (7) penetrating through the driving wheel shell (1) and the driven wheel shell (2), a containing space (3) surrounded by inner walls of the driving wheel shell (1) and the driven wheel shell (2), a driving assembly arranged in the containing space (3), and a heat dissipation mechanism for dissipating heat of the containing space (3), wherein the driving assembly comprises a driving motor (6) arranged on one side of the wheel hub shaft (7) and a transmission assembly arranged in the containing space (3), and the driving motor (6) drives the driving wheel shell (1) to rotate around the wheel hub shaft (7) through the transmission assembly.

2. An electric wheel hub according to claim 1, characterized in that: The heat dissipation mechanism comprises exhaust holes (4) and air inlet holes (5) arranged on the driving wheel shell (1) and / or the driven wheel shell (2), and the exhaust holes (4) and the air inlet holes (5) are in communication with the containing space (3).

3. An electric wheel hub according to claim 2, characterized in that: The exhaust holes (4) and the air inlet holes (5) are arranged on the side wall of the driven wheel shell (2), one side of the exhaust hole (4) is provided with a wind guide block (401), one side of the wind guide block (401) is connected with the side wall of the exhaust hole (4), and the other side of the wind guide block (401) protrudes into the containing space (3) and is arranged obliquely.

4. An electric hub as claimed in claim 3, characterized in that: The distance between the center of the exhaust hole (4) and the center of the wheel hub shaft (7) is greater than the distance between the center of the air inlet hole (5) and the center of the wheel hub shaft (7).

5. An electric wheel hub according to any one of claims 1 to 4, characterized in that: The transmission assembly comprises a gear ring (11) connected with the driving wheel shell (1), a first transmission gear (14) arranged on an output shaft of the driving motor (6), a gear shaft (13) arranged in the containing space (3), a second transmission gear (15) arranged on the gear shaft (13), and a third transmission gear (12) arranged on the gear shaft (13), the first transmission gear (14) is engaged with the second transmission gear (15), and the third transmission gear (12) is engaged with the gear ring (11).

6. An electric hub as claimed in claim 5, characterized in that: The electric wheel hub further comprises a dustproof mechanism for preventing dust from entering the transmission assembly, the dustproof mechanism comprises a first dustproof cover (17) and a second dustproof cover (18) arranged in the containing space (3), the first dustproof cover (17) is used for covering the output shaft of the driving motor (6), the first transmission gear (14), the second transmission gear (15), the third transmission gear (12), and the upper part of the gear ring (11), and the second dustproof cover (18) is used for covering the lower part of the gear ring (11).

7. An electric wheel hub according to claim 6, characterized in that: The first dustproof cover (17), the second dustproof cover (18), and the driving wheel shell (1) surround a dustproof space (10), the driving motor (6) is located outside the dustproof space (10), and the output end of the driving motor (6) and the transmission assembly are located in the dustproof space (10); a sealing element (25) is arranged between the side edge of the first dustproof cover (17), the side edge of the second dustproof cover (18), and the inner wall of the driving wheel shell (1).

8. An electric hub as claimed in claim 7, characterized in that: The second dustproof cover (18) is provided with a containing groove (181) for containing the gear ring (11).

9. An electric wheel hub as claimed in claim 5, characterized in that: The electric hub further comprises a fixing base (8) arranged in the accommodating space (3) and connected with the hub shaft (7), the fixing base (8) is provided with a shaft sleeve (801) matched with the hub shaft (7), the fixing base (8) is provided with a motor mounting cavity (802) for mounting and fixing the driving motor (6), the fixing base (8) is provided with an axle hole (803) for mounting and fixing the gear shaft (13); the top of the motor mounting cavity (802) is provided with a vent hole (804); the first dust cover (17) is connected to the top of the fixing base (8), the first dust cover (17) is provided with a gear accommodating cavity (9) for accommodating the first transmission gear (14), the second transmission gear (15), the third transmission gear (12) and the gear shaft (13); the second dust cover (18) is connected with the fixing base (7) and located below the first dust cover (17).

10. An electric wheel hub according to any one of claims 1 to 4, characterized in that: The electric hub further comprises a light emitting assembly, the light emitting assembly comprises a light emitting piece (19), a circuit board (20), a coil and a circular ring-shaped magnetic core (23), the circuit board (20) and the coil are annular; the circular ring-shaped magnetic core (23) is fixedly arranged on the hub shaft (7), the circuit board (20) and the coil are arranged on the driving wheel shell (1), the circular ring-shaped magnetic core (23) is located on the inner side of the circuit board (20), the coil is arranged on the inner side of the circuit board (20) and located between the circuit board (20) and the circular ring-shaped magnetic core (23); the light emitting piece (19) is arranged on the driving wheel shell (1) and electrically connected with the circuit board (20).

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