Wheel hub motor and electric vehicle

Abstract

The utility model discloses a kind of hub motor and electric vehicle, hub motor includes motor shaft, rotor assembly, stator assembly and air bag, motor shaft is equipped with exhaust passage, rotor assembly is set on motor shaft by bearing assembly, rotor assembly defines installation cavity, stator assembly is located in installation cavity and is connected with motor shaft, air bag is set in installation cavity, inner chamber of air bag is communicated with outside by exhaust passage, air bag can contract and expand to facilitate the air in air bag and inhale outside air is discharged.The hub motor provided by the utility model has the advantages of good heat dissipation effect and high sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, specifically to a hub motor and an electric vehicle. Background Technology

[0002] In related electric vehicle technologies, the cooling solution for the hub motor involves embedding coolant within the motor. During motor rotation, the coolant is agitated and dispersed across the motor's inner surface, transferring heat to this surface and dissipating it to the outside through components such as end caps. However, because the motor's internal cavity is a sealed space, changes in temperature can cause pressure variations in the internal gas. These pressure changes, applied to the weakest point—the oil seal—can cause the oil seal lip to flip, leading to motor seal failure. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a hub motor, which has the advantages of good heat dissipation and high sealing reliability.

[0005] An embodiment of this utility model also proposes an electric vehicle.

[0006] The hub motor of this utility model embodiment includes a motor shaft, a rotor assembly, a stator assembly, and an airbag. The motor shaft is provided with an exhaust channel. The rotor assembly is sleeved on the motor shaft through a bearing assembly, and the rotor assembly defines a mounting cavity. The stator assembly is located in the mounting cavity and is connected to the motor shaft. The airbag is disposed in the mounting cavity, and the inner cavity of the airbag is connected to the outside through the exhaust channel. The airbag can contract and expand to expel the air inside the airbag and draw in outside air.

[0007] According to an embodiment of the present invention, the hub motor incorporates an air bladder within the mounting cavity of the rotor assembly. The air bladder's inner cavity is connected to the outside via an exhaust channel on the motor shaft. When the hub motor operates and its internal temperature rises, the repeated contraction and expansion of the air bladder allows hot air to be expelled to the outside and cool air to be drawn in, effectively dissipating heat from the hub motor. This also ensures that the space enclosed by the outer surface of the air bladder and the inner surface of the mounting cavity does not experience excessive pressure due to temperature increases, thus effectively preventing excessive pressure from being applied to the oil seal and causing seal failure in the hub motor. This results in high sealing reliability for the hub motor.

[0008] In some embodiments, the hub motor further includes a bracket that is radially connected between the motor shaft and the stator assembly along the motor shaft, and the airbag is connected to the bracket.

[0009] In some embodiments, the bracket is a hollow structure that divides the mounting cavity into an outer cavity and an inner cavity. The bracket is provided with heat exchange holes that connect the outer cavity and the inner cavity, and the airbag is disposed in the inner cavity.

[0010] In some embodiments, the inner cavity is an annular cavity, and the inner surface of the annular cavity includes a first wall and a second wall that are axially opposite to each other along the motor shaft. The first wall or the second wall is in contact with and connected to the outer wall of the airbag.

[0011] In some embodiments, the airbag includes a connected body and a tube, the body being disposed within the mounting cavity and the tube being disposed within the exhaust channel.

[0012] In some embodiments, the hub motor further includes a seal disposed between the outer wall surface of the bladder tube and the inner wall surface of the exhaust channel, for sealing the gap between the outer wall surface of the bladder tube and the inner wall surface of the exhaust channel.

[0013] In some embodiments, the outer peripheral surface of the motor shaft is provided with an injection hole communicating with the exhaust channel. The injection hole is located outside the rotor assembly. The sealant includes sealant, which is adapted to be injected into the exhaust channel through the injection hole.

[0014] In some embodiments, the seal includes a sealing ring or sealant disposed at one end of the bladder tube adjacent to the bladder body.

[0015] In some embodiments, the hub motor further includes a vent valve connected to the motor shaft to prevent external dust and water from entering the exhaust channel.

[0016] In some embodiments, the exhaust passage is open at the end face of the first end of the motor shaft, and the vent valve is connected to the first end of the motor shaft;

[0017] The free end of the bladder tube is spaced apart from the ventilator valve, or the free end of the bladder tube is connected to the ventilator valve.

[0018] In some embodiments, a coolant is provided in the cavity formed by the inner wall of the mounting cavity and the outer wall of the airbag.

[0019] In some embodiments, the hub motor further includes a drive member disposed within the mounting cavity for driving the airbag to contract and inflate.

[0020] In some embodiments, the hub motor further includes a follower disposed within the mounting cavity and movably connected to the rotor assembly, the follower being moved by inertia when the rotor assembly rotates to compress the airbag to contract.

[0021] In some embodiments, the hub motor further includes an adjusting element whose volume can change with temperature, the adjusting element being connected to the airbag for controlling the contraction and expansion of the airbag.

[0022] The electric vehicle according to the present invention includes a hub motor as described in any of the above embodiments.

[0023] The technical advantages of the electric vehicle according to the present invention are the same as those of the hub motor in the above embodiments, and will not be repeated here. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of a hub motor according to an embodiment of the present utility model.

[0025] Figure 2 This is a schematic diagram of a hub motor according to an embodiment of the present utility model.

[0026] Figure 3 This is a cross-sectional view of the bracket and airbag in the hub motor according to an embodiment of the present utility model.

[0027] Figure 4 This is a schematic diagram of the bracket and airbag in the hub motor according to an embodiment of the present utility model.

[0028] Figure 5 This is another cross-sectional view of the hub motor according to an embodiment of the present utility model.

[0029] Figure label:

[0030] 1. Motor shaft; 11. Exhaust passage; 12. Glue injection hole; 2. Rotor assembly; 21. Inner cavity; 22. Outer cavity; 3. Bearing assembly; 4. Stator assembly; 5. Airbag; 51. Airbag body; 52. Airbag tube; 6. Bracket; 7. Vent valve; 8. Sealant; 9. Sealing ring. Detailed Implementation

[0031] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following is combined with Figures 1-5 A hub motor according to an embodiment of the present invention is described.

[0033] The hub motor of this utility model embodiment includes a motor shaft 1, a rotor assembly 2, a stator assembly 4, and an airbag 5. The motor shaft 1 is provided with an exhaust channel 11. The rotor assembly 2 is sleeved on the motor shaft 1 via a bearing assembly 3, and the rotor assembly 2 defines a mounting cavity. The stator assembly 4 is located within the mounting cavity and connected to the motor shaft 1. The airbag 5 is disposed within the mounting cavity, and its inner cavity 21 communicates with the outside through the exhaust channel 11. The airbag 5 can contract and expand to expel air from within the airbag 5 and draw in outside air.

[0034] According to the embodiment of the present invention, the hub motor has an airbag 5 installed in the mounting cavity of the rotor assembly 2, and the inner cavity 21 of the airbag 5 is connected to the outside through the exhaust channel 11 on the motor shaft 1. When the hub motor operates and the internal temperature rises, the repeated contraction and expansion of the airbag 5 allows the hot air inside the airbag 5 to be discharged to the outside and the cold air from the outside to be drawn in, thus achieving effective heat dissipation for the hub motor. This also ensures that the space enclosed by the outer surface of the airbag 5 and the inner surface of the mounting cavity does not become too high due to excessive temperature rise, thereby effectively preventing excessive pressure from being applied to the oil seal position and causing the hub motor's seal to fail. The hub motor has high sealing reliability.

[0035] It should be noted that the mounting cavity is connected to the exhaust channel 11, so that the airbag 5 located in the mounting cavity can communicate with the outside through the exhaust channel 11. The airbag 5 is in an inflated and deployed state when it is not subjected to external force and when the pressure inside and outside the airbag 5 is the same. It only undergoes elastic contraction under the action of external force, and can automatically return to the inflated state after the external force is removed. The "expansion" in the above-mentioned airbag 5's contraction and expansion refers to the airbag 5 rebounding back to its original deployed state after contraction.

[0036] In some embodiments, the hub motor further includes a bracket 6, which is radially connected between the motor shaft 1 and the stator assembly 4, and the airbag 5 is connected to the bracket 6.

[0037] At this time, the airbag 5 is confined between the stator assembly 4 and the motor shaft 1, thereby effectively preventing the airbag 5 from interfering with the rotation of the rotor assembly 2 relative to the motor shaft 1 and the stator assembly 4 in any state, and making the hub motor more reliable in operation.

[0038] Optionally, the bracket 6 is a hollow structure and the mounting cavity is divided into an outer cavity 22 and an inner cavity 21. The bracket 6 is provided with heat exchange holes that connect the outer cavity 22 and the inner cavity 21, and the airbag 5 is located in the inner cavity 21.

[0039] The bracket 6 limits the position of the airbag 5 through the inner cavity 21, effectively preventing the airbag 5 from moving too far relative to the bracket 6 and interfering with the rotor assembly 2 or bearing assembly 3, thereby effectively ensuring the reliability of the airbag 5. At the same time, the heat exchange holes on the bracket 6 also effectively improve the heat exchange efficiency between the air inside the airbag 5 and the stator assembly 4 and rotor assembly 2, thereby effectively improving the heat dissipation efficiency of the hub motor.

[0040] For example, such as Figure 1 , Figure 3 and Figure 4 As shown, the bracket 6 is riveted or snapped to the stator and is interference-fitted onto the motor shaft 1. The bracket 6 has multiple heat exchange holes on at least one side wall opposite to the motor shaft 1 along the axial direction, so as to facilitate better heat exchange between the air inside the airbag 5 and the air in the outer cavity 22.

[0041] In some embodiments, the inner cavity 21 is an annular cavity, and the inner surface of the annular cavity includes a first wall surface and a second wall surface that are axially opposite to each other along the motor shaft 1. The first wall surface or the second wall surface is in contact with and connected to the outer wall surface of the airbag 5.

[0042] This allows the airbag 5 to be relatively fixed to the bracket 6 on any side wall along the axial direction of the motor shaft 1. Under the limitation of this side wall, the remaining parts of the airbag 5 are less likely to fail to rebound and reset during the contraction process, and the airbag 5 provides higher reliability for the breathing and heat dissipation of the hub motor.

[0043] For example, the first wall of the annular cavity is bonded to the outer wall of the airbag 5, and the second wall of the annular cavity is provided with multiple heat exchange holes.

[0044] In some embodiments, the airbag 5 includes a connected body 51 and a tube 52, with the body 51 disposed in the mounting cavity and the tube 52 disposed in the exhaust channel 11.

[0045] This makes it easier for the inner cavity 21 of the capsule 51 to connect with the outside through the exhaust channel 11, and the reliability and convenience of the connection between the inner cavity 21 of the capsule 51 and the exhaust channel 11 / outside are higher.

[0046] For example, such as Figure 1 and Figure 2 As shown, the main body of the exhaust channel 11 extends along the axial direction of the motor shaft 1, and another part extends to the outer peripheral surface of the motor shaft 1 and is open on the outer peripheral surface. The opening is located on the inner side of the inner peripheral wall of the bracket 6. The inner peripheral wall of the bracket 6 is provided with a through hole communicating with the opening. The bladder tube 52 passes through the through hole and is inserted into the exhaust channel 11 through the opening.

[0047] In some embodiments, the hub motor further includes a seal disposed between the outer wall surface of the bladder tube 52 and the inner wall surface of the exhaust channel 11 to seal the gap between the outer wall surface of the bladder tube 52 and the inner wall surface of the exhaust channel 11.

[0048] This effectively prevents external dust and water from entering the outer cavity 22 through the exhaust channel 11, resulting in a good waterproof seal for the hub motor. Furthermore, when the hub motor heats up, the expansion of the air inside the outer cavity 22 compresses the airbag 5, expelling the hot air from the airbag 5 to the outside. Conversely, as the pressure inside the outer cavity 22 decreases, the airbag 5 automatically rebounds to draw in cool outside air, thus cooling the air inside the outer cavity 22. By repeating these actions, the airbag 5 automatically and repeatedly contracts and expands, achieving rapid heat dissipation for the hub motor while also effectively reducing the heat dissipation cost.

[0049] For example, an oil seal assembly is provided between the rotor assembly 2 and the bearing assembly 3, and an oil seal assembly is provided between the bearing assembly 3 and the motor shaft 1, thereby ensuring the waterproof sealing of the outer cavity 22.

[0050] In some embodiments, such as Figure 5 As shown, the outer circumferential surface of the motor shaft 1 is provided with an injection hole 12 that communicates with the exhaust channel 11. The injection hole 12 is located outside the rotor assembly 2. The sealant includes sealant 8, which is suitable for being injected into the exhaust channel 11 through the injection hole 12.

[0051] That is, the sealant 8 is injected into the exhaust channel 11 through the injection hole 12 to fill the gap between the outer wall of the tube 52 and the outer wall of the exhaust channel 11. After solidification, the sealant 8 is tightly connected to the outer wall of the tube 52 and the inner wall of the exhaust channel 11, resulting in a highly reliable waterproof seal between the tube 52 and the motor shaft 1. Moreover, since the injection hole 12 is located outside the rotor assembly 2, the sealant injection operation can be completed after the assembly of each component of the hub motor is finished, resulting in high assembly efficiency of the hub motor.

[0052] For example, sealant 8 is adhered to a position of the bladder tube 52 away from the free end of the bladder tube 52 to prevent sealant 8 from accidentally blocking the free end opening of the bladder tube 52.

[0053] In some embodiments, the seal includes a sealing ring 9 or a sealant, which is disposed at one end of the bladder tube 52 adjacent to the bladder body 51.

[0054] The sealing ring 9 or sealant ensures the sealing of the connection between the bladder tube 52 and the motor shaft 1, so as to ensure the waterproof reliability of the outer cavity 22. At the same time, it also limits the position of the bladder 51 near the motor shaft 1, preventing the bladder 51 from shifting position during reciprocating contraction and expansion.

[0055] For example, such as Figure 1 , Figure 3 and Figure 4As shown, there are three sealing rings 9, which are arranged at intervals along the extension direction of the bladder tube 52. The bladder tube 52 can be a rigid tube, and the sealing rings 9 are fitted onto the bladder tube 52 by elastic deformation; or, the bladder tube 52 can be a flexible tube, and the sealing rings 9 are integrally formed with the bladder tube 52.

[0056] For example, one end of the bladder tube 52 adjacent to the bladder body 51 is sealed to the motor shaft 1 by sealant.

[0057] In some embodiments, the hub motor further includes a vent valve 7, which is connected to the motor shaft 1 and is used to prevent external dust and water from entering the exhaust channel 11.

[0058] The ventilation valve 7 effectively prevents external dust and water from entering the exhaust channel 11. On the one hand, it further reduces the chance of dust and water entering the outer cavity 22, and on the other hand, it prevents dust and water from entering the airbag 5 and affecting the performance and service life of the airbag 5.

[0059] For example, such as Figure 1 , Figure 2 and Figure 5 As shown, the exhaust channel 11 is open at the end face of the first end of the motor shaft 1, and the vent valve 7 is connected to the first end of the motor shaft 1, thus making the connection between the vent valve 7 and the motor shaft 1 convenient and reliable. The free end of the bladder tube 52 is spaced apart from the vent valve 7, thereby simplifying the connection operation between the bladder tube 52 and the vent valve 7 and improving the assembly efficiency of the hub motor. Alternatively, the free end of the bladder tube 52 can be connected to the vent valve 7. In this case, outside air only enters the bladder tube 52 through the vent valve 7 and does not enter the gap between the outer wall of the bladder tube 52 and the inner wall of the exhaust channel 11, further reducing the probability of dust and water entering the outer cavity 22, and improving the waterproof sealing of the hub motor.

[0060] It should be noted that the cavity formed by the inner wall of the mounting cavity and the outer wall of the airbag 5 is filled with coolant. That is, the outer cavity 22 is filled with coolant that exchanges heat with the rotor assembly 2 and the stator assembly 4. The hot and cold liquid can transfer the heat on it to the end cover of the rotor assembly 2 and then discharge it to the outside through the end cover. The heat dissipation of the coolant, combined with the heat dissipation of the airbag 5, further improves the heat dissipation efficiency of the hub motor.

[0061] In some embodiments, the hub motor further includes a drive member disposed within the mounting cavity for driving the airbag 5 to contract and inflate.

[0062] That is, the airbag 5 can be actively driven to contract and expand through the drive components to achieve active heat dissipation of the hub motor, and the heat dissipation of the hub motor is more controllable.

[0063] For example, the driving components include, but are not limited to, servo motors or fan-like mechanisms, such as servo motors mounted on bracket 6 and whose driving end is connected to the airbag 5.

[0064] In some embodiments, the hub motor further includes a follower disposed in the mounting cavity and movably connected to the rotor assembly 2. The follower is used to move by inertia when the rotor assembly 2 rotates to compress the airbag 5 to contract.

[0065] That is, as the tire connected to the rotor assembly 2 rotates, the follower moves relative to the rotor assembly 2 under the action of the constantly changing centrifugal force to compress the airbag 5 to contract and release, so as to achieve effective heat dissipation of the hub motor.

[0066] For example, the follower can be a toggle member that is pivotally connected to the rotor assembly 2, and the toggle member rotates relative to the rotor assembly 2 to compress the airbag 5 to contract and release.

[0067] In some embodiments, the hub motor further includes an adjusting element whose volume can change with temperature, the adjusting element being connected to the airbag 5 for controlling the contraction and expansion of the airbag 5.

[0068] If the regulating component is made of shape memory metal, its volume will decrease or increase when the temperature rises, so as to pull the airbag 5 to contract or expand, thereby realizing the heat exchange between the outside air and the air inside the hub motor.

[0069] For example, the adjusting element may be a spoke-like structure disposed within the airbag 5, which elongates or shortens with temperature changes to control the expansion and contraction of the airbag 5.

[0070] The electric vehicle according to the present invention includes a hub motor as described in any of the above embodiments.

[0071] The technical advantages of the electric vehicle according to the present invention are the same as those of the hub motor in the above embodiments, and will not be repeated here.

[0072] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0075] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A hub motor, characterized in that, include: Motor shaft (1), on which an exhaust channel (11) is provided; Rotor assembly (2), which is sleeved on the motor shaft (1) via bearing assembly (3), and the rotor assembly (2) defines a mounting cavity; Stator assembly (4), the stator assembly (4) is located in the mounting cavity and connected to the motor shaft (1); An airbag (5) is disposed in the mounting cavity. The inner cavity (21) of the airbag (5) is connected to the outside through the exhaust channel (11). The airbag (5) can contract and expand to expel the air inside the airbag (5) and draw in outside air.

2. The hub motor according to claim 1, characterized in that, The hub motor also includes a bracket (6), which is radially connected between the motor shaft (1) and the stator assembly (4) along the motor shaft (1), and the airbag (5) is connected to the bracket (6).

3. The hub motor according to claim 2, characterized in that, The bracket (6) is a hollow structure and divides the mounting cavity into an outer cavity (22) and an inner cavity (21). The bracket (6) is provided with heat exchange holes that connect the outer cavity (22) and the inner cavity (21). The airbag (5) is located in the inner cavity (21).

4. The hub motor according to claim 3, characterized in that, The inner cavity (21) is an annular cavity. The inner surface of the annular cavity includes a first wall surface and a second wall surface that are axially opposite to each other along the motor shaft (1). The first wall surface or the second wall surface is in contact with and connected to the outer wall surface of the airbag (5).

5. The hub motor according to claim 1, characterized in that, The airbag (5) includes a connected body (51) and a tube (52), the body (51) being located in the mounting cavity and the tube (52) being located in the exhaust channel (11).

6. The hub motor according to claim 5, characterized in that, The hub motor also includes a seal, which is disposed between the outer wall of the bladder tube (52) and the inner wall of the exhaust channel (11) to seal the gap between the outer wall of the bladder tube (52) and the inner wall of the exhaust channel (11).

7. The hub motor according to claim 6, characterized in that, The outer circumferential surface of the motor shaft (1) is provided with an injection hole (12) communicating with the exhaust channel (11). The injection hole (12) is located outside the rotor assembly (2). The sealant includes sealant (8), which is adapted to be injected into the exhaust channel (11) through the injection hole (12).

8. The hub motor according to claim 6 or 7, characterized in that, The sealing element includes a sealing ring (9) or a sealant, which is disposed at one end of the bladder tube (52) adjacent to the bladder body (51).

9. The hub motor according to claim 6, characterized in that, The hub motor also includes a vent valve (7), which is connected to the motor shaft (1) and is used to prevent external dust and water from entering the exhaust channel (11).

10. The hub motor according to claim 9, characterized in that, The exhaust channel (11) is open at the end face of the first end of the motor shaft (1), and the vent valve (7) is connected to the first end of the motor shaft (1); The free end of the bladder tube (52) is spaced apart from the ventilator valve (7), or the free end of the bladder tube (52) is connected to the ventilator valve (7).

11. The hub motor according to claim 6, characterized in that, Coolant is provided in the cavity formed by the inner wall of the mounting cavity and the outer wall of the airbag (5).

12. The hub motor according to claim 1, characterized in that, The hub motor also includes a drive component, which is located in the mounting cavity and is used to drive the airbag (5) to contract and expand.

13. The hub motor according to claim 1, characterized in that, The hub motor also includes a follower, which is disposed in the mounting cavity and movably connected to the rotor assembly (2). The follower is used to move by inertia when the rotor assembly (2) rotates to compress the airbag (5) to contract.

14. The hub motor according to claim 1, characterized in that, The hub motor also includes an adjustment component whose volume can change with temperature. The adjustment component is connected to the airbag (5) and is used to control the contraction and expansion of the airbag (5).

15. An electric vehicle, characterized in that, Including the hub motor according to any one of claims 1-14.

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