Hub motor cooling structure and hub motor

Abstract

The application relates to the technical field of motor cooling systems, and particularly discloses a hub motor cooling structure and a hub motor, wherein the hub motor cooling structure comprises a Venturi tube and no less than two oil liquid guide pipes; cooling liquid is added into a motor shell of the hub motor; the motor shell rotates to form a continuous annular liquid layer on the circumferential wall surface in the inner cavity of the motor shell or to accumulate on the low side of the inner cavity of the motor shell; one end of the oil liquid guide pipe is communicated with a negative pressure suction port of the Venturi tube; the other end of the oil liquid guide pipe passes through the stator along the fixed shaft in the radial direction and faces the rotating direction of the annular liquid layer; the hub motor cooling structure breaks the cooling liquid into cooling liquid droplets; the cooling liquid droplets can absorb a large amount of heat when contacting the stator, the heat exchange efficiency is improved, the winding power loss is reduced, and the working efficiency of the hub motor is improved; the stator winding of the hub motor can pass through a larger current, and a larger torque can be output under the premise that the size of the hub motor is unchanged.

Description

Technical Field

[0001] This invention relates to energy-saving electric motors, and more particularly to the field of motor cooling system technology, specifically a hub motor cooling structure and a hub motor. Background Technology

[0002] In-wheel motors integrate the power system and transmission system, offering advantages such as compact structure, high transmission efficiency, and cost reduction. However, under conditions of high ambient temperature, low speed and high load, or high speed, the stator windings and core of an in-wheel motor will generate a large amount of heat due to eddy current losses and hysteresis losses. If the heat is not dissipated in time, the temperature of the in-wheel motor will continue to rise. Excessive temperature will directly reduce the efficiency of the in-wheel motor in converting electrical energy into mechanical energy, leading to increased vehicle energy consumption, shortened driving range, accelerated aging of internal components, and demagnetization of permanent magnets.

[0003] In existing technologies, hub motors mostly use air cooling and liquid cooling: air cooling involves installing blades or heat sinks on the motor housing and using the airflow generated during the rotation of the motor housing to dissipate heat. However, the internal space of a hub motor is small and enclosed, resulting in poor air convection conditions, and air cooling relying on the motor housing is ineffective. Liquid cooling involves setting up cooling channels on the stator and using the circulation of coolant to remove heat. This requires the configuration of a liquid pump, liquid tank, and heat exchanger, which is heavy and inconvenient to maintain. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a hub motor cooling structure and hub motor. The hub motor cooling structure breaks the coolant into coolant droplets. The coolant droplets can absorb a large amount of heat when they come into contact with the stator, thereby improving the heat exchange efficiency, reducing the winding power loss, and improving the working efficiency of the hub motor. The stator winding of the hub motor can carry a larger current and output a larger torque without changing the size of the hub motor.

[0005] The technical solution adopted by this invention to solve its technical problem includes: On the one hand, a hub motor cooling structure is provided, which is installed on the hub motor and includes a fan, a first connecting pipe, a second connecting pipe, a venturi tube, and no fewer than two oil inlet pipes.

[0006] The hub motor includes a fixed shaft, a motor housing, a rotor, and a stator. Insulating coolant is added into the motor housing. The rotation of the motor housing can cause the coolant to form a continuous annular liquid layer on the circumferential wall surface of the inner cavity of the motor housing or to accumulate on one side of the lower part of the inner cavity of the motor housing.

[0007] The fixed shaft is provided with an air inlet channel and an air outlet channel connecting the inside and outside of the motor housing. The air outlet channel, the first connecting pipe, the fan, the second connecting pipe, the air inlet channel, and the inner cavity of the motor housing are connected end to end in sequence to form a unidirectional gas circulation path. The gas enters the inner cavity of the motor housing through the air inlet channel in the flow path. The connection port of the air inlet channel located inside the motor housing is connected to the driving gas inlet of the Venturi tube. The oil inlet pipe is fixedly installed on the stator. One end of the oil inlet pipe is connected to the negative pressure port of the Venturi tube, and the other end of the oil inlet pipe passes radially over the stator along the fixed shaft and faces the rotation direction of the annular liquid layer.

[0008] In a preferred embodiment of the present invention, during the process of coolant accumulating on one side of the low position inside the motor housing cavity, at least one end of an oil inlet pipe is inserted into the coolant.

[0009] As a preferred embodiment of the present invention, the air intake channel is connected to one end of the connection port inside the motor housing and the conduit, and a spiral flow channel is provided inside the conduit.

[0010] As a preferred embodiment of the present invention, a deformable container is installed on the first connecting pipe, and an oil-gas separation component is provided inside the container.

[0011] On the other hand, a hub motor is also provided, including any of the aforementioned hub motor cooling structures.

[0012] As a preferred embodiment of the present invention, the motor housing includes two end caps rotatably mounted on a fixed shaft, an annular shell is fixedly installed between the two end caps, and at least one end cap has a plurality of accommodating grooves with openings facing the rotation direction of the annular liquid layer installed on its inner side.

[0013] As a preferred embodiment of the present invention, the outer side of the receiving groove is provided with a micropore that connects to the bottom side of the inner cavity of the receiving groove.

[0014] As a preferred embodiment of the present invention, the angle between the orientation of each receiving groove opening and the radial direction of the fixed shaft is different.

[0015] On the other hand, a hub motor cooling structure is also provided, which is installed on the hub motor and includes no fewer than two drain elements.

[0016] The hub motor includes a fixed shaft, a motor housing, a rotor, and a stator. Insulating coolant is added into the motor housing. The rotation of the motor housing can cause the coolant to form an annular liquid layer on the circumferential wall surface of the inner cavity of the motor housing or to accumulate on one side of the lower part of the inner cavity of the motor housing.

[0017] The drainage component is either an arc-shaped blade with its concave surface facing the direction of rotation of the annular liquid layer or a rigid tube with one end facing the direction of rotation of the annular liquid layer, and the drainage component is fixedly installed on the stator.

[0018] The guide member causes a portion of the coolant within the annular liquid layer to change its direction of movement and collide with the stator and / or fixed shaft.

[0019] As a preferred embodiment of the present invention, the motor housing includes two end caps rotatably mounted on a fixed shaft, an annular shell is fixedly installed between the two end caps, an annular component is installed on the inner side of at least one end cap, an annular groove is provided on the inner circumference of the annular component, and a plurality of through holes communicating with the bottom side of the annular groove are provided on the annular component.

[0020] During the process of the motor housing rotating and the coolant inside the motor housing forming an annular liquid layer, a portion of the guide component causes the coolant in the annular liquid layer to change its direction of movement and enter the annular groove of the annular component. The coolant in the annular groove falls onto the stator through the through hole.

[0021] Compared with the prior art, the beneficial effects of the present invention are: 1. The hub motor cooling structure of the present invention breaks the coolant into coolant droplets. The coolant droplets can absorb a large amount of heat when they come into contact with the stator core and stator windings, which improves the heat exchange efficiency. The same stator windings can carry a larger current, and output a larger torque without changing the size of the hub motor.

[0022] 2. In the hub motor cooling structure of the present invention, after the motor housing rotates and the coolant inside the motor housing forms an annular liquid layer, the guide component causes the coolant in the annular liquid layer to change its movement direction and enter the annular groove of the annular component. The coolant in the annular groove falls onto the stator through the through hole, so that the coolant can directly contact the stator core and stator winding of the stator, thereby improving the heat exchange efficiency.

[0023] 3. In the hub motor of this invention, during the process of coolant accumulating on one side of the low position inside the motor housing cavity, at least one end of the oil inlet pipe is inserted into the coolant. A negative pressure is generated at the negative pressure outlet of the venturi tube, causing the coolant accumulated on one side of the low position inside the motor housing cavity to be drawn into the venturi tube. The gas jet inside the venturi tube breaks the drawn-in coolant into coolant droplets, thereby achieving stator heat dissipation of this hub motor under low-speed, high-load conditions.

[0024] 4. In the hub motor of this invention, coolant droplets inside the motor housing fall onto the inner wall of the motor housing, and the heat of the coolant droplets is transferred to the motor housing, shortening the heat transfer path, reducing the temperature difference between the motor housing and the coolant, and increasing the temperature difference between the motor housing and the outside air, thereby improving the heat dissipation efficiency of this hub motor.

[0025] 5. In the hub motor of this invention, the fan draws gas from the motor housing through the first connecting pipe, the air outlet channel on the fixed shaft, and the spiral flow channel in the duct. As the coolant droplets in the gas move within the spiral flow channel, they gather on the outermost side of the inner wall of the spiral flow channel under the action of centrifugal force and flow downward, thereby achieving the separation of gas and coolant droplets. This avoids coolant droplets accumulating in the fan and causing damage to the fan, thus improving the reliability of this hub motor. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 Another perspective structural diagram; Figure 3 for Figure 1 A partial sectional view of the structure; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A; Figure 5 This is a schematic diagram of the catheter structure of the present invention; Figure 6 for Figure 1 A schematic diagram of the end cap structure; Figure 7 This is a partial cross-sectional view of another embodiment of the present invention; Figure 8 for Figure 7 A schematic diagram of the end cap structure.

[0027] In the figure: 1 fan, 2 first connecting pipe, 3 container, 4 second connecting pipe, 5 fixed shaft, 6 annular shell, 7 end cap, 8 oil inlet pipe, 9 venturi tube, 10 conduit, 11 stator, 12 rotor, 13 drainage component, 14 spiral flow channel, 15 receiving groove, 16 annular component. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] Example 1: Please see Figures 1-4This embodiment discloses a hub motor, including a fixed shaft 5, on which a rotating motor housing is mounted. A rotor 12 is mounted on the periphery of the inner cavity of the motor housing. A stator 11 is mounted on the fixed shaft 5 at a position inside the motor housing. The stator 11 includes a stator core and a stator winding wound on the stator core. Both ends of the fixed shaft 5 are located outside the motor housing, and the inner cavity of the motor housing is closed.

[0030] It also includes a hub motor cooling structure, which includes a fan 1, a first connecting pipe 2, a second connecting pipe 4, a venturi tube 9, and at least two rigid oil inlet pipes 8.

[0031] An insulating coolant, which can be mineral oil, silicone oil, or fluorinated liquid, is added into the motor housing. The rotation of the motor housing causes the coolant to form a continuous annular liquid layer on the circumferential wall of the inner cavity of the motor housing or to accumulate on one side of the lower part of the inner cavity of the motor housing.

[0032] The fixed shaft 5 has an air inlet channel and an air outlet channel that connect the inside and outside of the motor housing. The air outlet channel is connected to the inlet of the fan 1 through the first connecting pipe 2 at the connection port outside the motor housing. The air inlet channel is connected to the outlet of the fan 1 through the second connecting pipe 4 at the connection port outside the motor housing. The air inlet channel is connected to the driving gas inlet of the venturi tube 9 at the connection port inside the motor housing. The oil inlet pipe 8 is fixed at equal angles around the fixed shaft 5 on the stator 11. One end of the oil inlet pipe 8 is connected to the negative pressure extraction port of the venturi tube 9. The other end of the oil inlet pipe 8 passes radially over the stator 11 along the fixed shaft 5 and faces the rotation direction of the annular liquid layer.

[0033] The venturi tube 9 used in this invention is a commonly used component in the prior art. Its working method and structure are well-known technologies and will not be described in detail here.

[0034] Furthermore, the fan 1, the external control switch, and the external power supply are connected in series, and the operator powers on the fan 1 by controlling the switch; or the fan 1 is connected to the vehicle's power supply circuit, and the operator powers on the vehicle and then powers on the fan 1.

[0035] The working process and principle of this embodiment are as follows: The operator powers on the blower 1, which draws gas from the motor housing through the outlet channel on the first connecting pipe 2 and the fixed shaft 5. The blower 1 pressurizes the drawn air and then delivers it to the venturi tube 9 through the inlet channel on the second connecting pipe 4 and the fixed shaft 5. A negative pressure is generated at the negative pressure outlet of the venturi tube 9.

[0036] During the rotation of the hub motor, when the coolant forms a continuous annular liquid layer on the circumferential wall of the motor housing, one end of the oil inlet pipe 8 enters the annular liquid layer. The oil inlet pipe 8 causes a portion of the coolant in the annular liquid layer to enter the negative pressure port of the Venturi tube 9. The gas jet inside the Venturi tube 9 breaks the coolant flowing into the negative pressure port of the Venturi tube 9 into coolant droplets. The rotating motor housing causes the gas inside the motor housing to flow. The flowing gas inside the motor housing causes the coolant droplets to continuously fall on various parts of the stator 11, avoiding the generation of local overheating points on the stator 11. The heat on the stator 11 is transferred to the coolant droplets, achieving the cooling of the stator 11. Under the action of gravity, the coolant droplets on the stator 11 fall into the annular liquid layer, and the heat of the annular liquid layer is transferred to the motor housing. The heat on the motor housing is transferred to the air outside the motor housing to achieve heat dissipation.

[0037] The hub motor cooling structure allows coolant droplets to directly contact the stator core and stator windings of stator 11. The coolant droplets are small with a large surface area to volume ratio. The coolant droplets can absorb a large amount of heat when in contact with the stator core and stator windings, improving heat exchange efficiency. The temperature distribution of the stator core and stator windings is uniform, and the same stator windings can carry a larger current, outputting greater torque without changing the size of the hub motor.

[0038] In this hub motor, the coolant droplets come into direct contact with the stator core and stator windings, resulting in a shorter heat transfer path. Furthermore, when the coolant is oil, the coolant droplets can act on the bearings of the hub motor, thus lubricating the bearings.

[0039] Furthermore, during the process of the motor housing rotating and causing the coolant to form a continuous annular liquid layer on the circumferential wall of the motor housing cavity, the stator 11 does not come into contact with the annular liquid layer, thereby reducing the oil hysteresis resistance during the rotation of the rotor 12.

[0040] Preferably, this hub motor is suitable for electric vehicles.

[0041] Preferably, after the hub motor is installed, the venturi tube 9 is located above the fixed shaft 5, and the oil inlet pipe 8 is made of hard metal.

[0042] Preferably, the Venturi tube 9 is provided with the same number of negative pressure ports as the oil inlet pipe 8, and the negative pressure of the negative pressure ports of the Venturi tube 9 increases the flow rate of coolant in the oil inlet pipe 8.

[0043] Preferably, the gas inside the motor housing is nitrogen. At the same temperature, nitrogen expands and contracts less than air, resulting in a lower increase in gas pressure inside the motor housing and thus reducing coolant leakage.

[0044] Preferably, the air intake channel and the air outlet channel within the fixed shaft 5 are two circumferential through holes on the fixed shaft 5; or the air intake channel and the air outlet channel within the fixed shaft 5 are two connecting pipes passing through the wire hole.

[0045] Example 2: like Figure 3 As shown, this embodiment discloses a hub motor, whose structure is roughly the same as that of Embodiment 1. The difference is that, during the process of coolant accumulating on one side of the low position inside the motor housing cavity, at least one end of the oil inlet pipe 8 is inserted into the coolant.

[0046] The working process and principle of this embodiment are as follows: When the hub motor operates at low speed, the coolant accumulates on one side of the lower part of the motor housing cavity. The operator powers on the fan 1, which draws air from the motor housing through the exhaust channel on the first connecting pipe 2 and the fixed shaft 5. The fan 1 pressurizes the drawn air and delivers it to the venturi tube 9 through the intake channel on the second connecting pipe 4 and the fixed shaft 5. A negative pressure is generated at the negative pressure port of the venturi tube 9, causing the coolant accumulated on one side of the lower part of the motor housing cavity to be drawn into the venturi tube 9. The gas jet in the venturi tube 9 breaks the drawn-in coolant into coolant droplets. The rotating motor housing generates airflow inside the motor housing, and the coolant droplets cover all parts of the stator 11, thus achieving heat dissipation of the stator 11 of this hub motor under low-speed, high-load conditions.

[0047] Furthermore, coolant droplets inside the motor housing fall onto the inner wall of the motor housing, and the heat of the coolant droplets is transferred to the motor housing, shortening the heat transfer path, reducing the temperature difference between the motor housing and the coolant, and increasing the temperature difference between the motor housing and the outside air, thereby improving the heat dissipation efficiency of this hub motor.

[0048] Preferably, the inner wall of the motor housing has several protrusions to accelerate the airflow inside the motor housing.

[0049] Example 3: like Figure 5 As shown, this embodiment discloses a hub motor, whose structure is roughly the same as that of Embodiment 2. The difference is that in this embodiment, the air intake channel is connected to the connection port inside the motor housing and one end of the duct 10. The duct 10 is provided with a spiral flow channel 14 and is located below the fixed shaft 5.

[0050] The working process and principle of this embodiment are as follows: The fan 1 draws gas from the motor housing through the first connecting pipe 2, the air outlet channel on the fixed shaft 5, and the spiral flow channel 14 in the duct 10. As the coolant droplets in the gas move within the spiral flow channel 14, they gather on the outermost side of the inner wall of the spiral flow channel 14 under the action of centrifugal force and flow downward, thereby separating the gas and coolant droplets. This prevents coolant droplets from accumulating in the fan 1 and causing damage to the fan 1, thus improving the reliability of the hub motor.

[0051] Example 4: like Figure 1 , Figure 2 As shown, this embodiment discloses a hub motor. Based on Embodiment 1, Embodiment 2 or Embodiment 3, this embodiment has a deformable container 3 installed on the first connecting pipe 2. The container 3 is provided with an oil-gas separation component, which is a metal wire ball or several stacked bodies. The oil-gas separation component makes the container 3 form a tortuous gas flow channel.

[0052] Container 3 is made of elastic or soft material, and container 3 is set higher than fixed axis 5.

[0053] The working process and principle of this embodiment are as follows: When the temperature of the gas inside the motor housing increases, the volume of the gas inside the motor housing increases, and the gas inside the motor housing enters container 3, causing the volume of container 3 to increase; when the temperature of the gas inside the motor housing decreases, the volume of the gas inside the motor housing decreases, and the gas in container 3 flows into the motor housing, causing the volume of container 3 to decrease.

[0054] The container 3 minimizes the pressure difference between the inside and outside of the motor housing, reducing the risk of coolant leakage from the motor housing and preventing moisture from being drawn into the motor housing, which could cause aging of the stator 11 and rotor 12.

[0055] Example 5: like Figure 1 , Figure 6 As shown, this embodiment discloses a hub motor, whose structure is roughly the same as that of Embodiment 1. The difference is that the motor housing in this embodiment includes two end caps 7 mounted on a fixed shaft 5 by bearings, and an annular shell 6 is fixedly installed between the two end caps 7. At least one end cap 7 has a plurality of openings facing the rotation direction of the annular liquid layer in the inner side of the end cap 7, and the oil inlet pipe 8 does not restrict the rotation of the receiving groove 15 with the end cap 7.

[0056] Furthermore, the inner wall of the receiving tank 15 is arc-shaped or inclined near the opening, so that the coolant in the receiving tank 15 moves towards the stator 11.

[0057] The working process and principle of this embodiment are as follows: When the hub motor operates at low speed, the coolant accumulates on one side of the low position inside the motor housing cavity. After the accumulated coolant passes through the receiving tank 15, the receiving tank 15 is filled with coolant. After the accumulated coolant leaves the receiving tank 15, the coolant in the receiving tank 15 is poured onto the stator 11, thereby achieving heat dissipation of the stator 11 under low-speed and high-load conditions.

[0058] Example 6: like Figure 6 As shown, this embodiment discloses a hub motor, whose structure is roughly the same as that of embodiment five. The difference is that the outer side of the receiving groove 15 in this embodiment is provided with a microhole that connects to the bottom side of the inner cavity of the receiving groove 15. The diameter of the microhole is less than 1.0 mm.

[0059] The working process and principle of this embodiment are as follows: After the hub motor rotates at high speed, the coolant forms a continuous annular liquid layer on the circumferential wall of the inner cavity of the motor housing. The receiving groove 15 does not coincide with the annular liquid layer. The coolant in the receiving groove 15 flows out through the micropores, so that the center of mass of the hub motor coincides with the axis of rotation, thus avoiding vibration caused by the high-speed operation of the hub motor.

[0060] Example 7: like Figure 6 As shown, this embodiment discloses a hub motor, whose structure is roughly the same as that of Embodiment 5. The difference is that the angle between the opening of each receiving slot 15 and the radial direction of the fixed shaft 5 is different in this embodiment.

[0061] The working process and principle of this embodiment are as follows: The coolant flowing out of each receiving tank 15 falls on various parts of the stator 11, ensuring that all parts of the stator 11 can come into contact with the coolant and guaranteeing the uniformity of heat dissipation of the stator 11.

[0062] Example 8: like Figure 7 As shown, this embodiment discloses a hub motor, including a fixed shaft 5, a rotating motor housing mounted on the fixed shaft 5, a rotor 12 mounted on the periphery of the inner cavity of the motor housing, and a stator 11 mounted on the fixed shaft 5 at a position inside the motor housing, the stator 11 and the motor housing not in contact.

[0063] It also includes a hub motor cooling structure, which includes at least two drain elements 13 arranged at equal angles on the stator 11.

[0064] In this process, an insulating coolant is added into the motor housing. The rotation of the motor housing causes the coolant to form an annular liquid layer on the circumferential wall surface of the inner cavity of the motor housing or to accumulate on one side at the lower position of the inner cavity of the motor housing.

[0065] The flow guide 13 is an arc-shaped blade with a concave surface facing the direction of rotation of the annular liquid layer or a rigid tube with one end facing the direction of rotation of the annular liquid layer. The flow guide 13 is fixedly installed on the stator 11.

[0066] The guide element 13 causes a portion of the coolant within the annular liquid layer to change its direction of movement and collide with the stator 11 and / or the fixed shaft 5.

[0067] The working process and principle of this embodiment are as follows: During the rotation of the hub motor, when the coolant forms a continuous annular liquid layer on the circumferential wall of the motor housing, one end of the guide 13 enters the annular liquid layer. The guide 13 causes a portion of the coolant in the annular liquid layer to change its direction of movement and collide with the stator 11 and / or the fixed shaft 5, forming coolant droplets. The coolant droplets continuously fall on various parts of the stator 11, preventing the generation of local hot spots on the stator 11. The heat on the stator 11 is transferred to the coolant droplets, achieving the cooling of the stator 11. The coolant droplets on the stator 11 fall into the annular liquid layer under the action of gravity, and the heat of the annular liquid layer is dissipated through the motor housing.

[0068] Example 9: like Figure 8 As shown, this embodiment discloses a hub motor cooling structure, which is roughly the same as the structure of embodiment eight. The difference is that the motor housing in this embodiment includes two end caps 7 mounted on a fixed shaft 5 by bearings. An annular shell 6 is fixedly installed between the two end caps 7. An annular member 16 coaxial with the fixed shaft 5 is installed on the inner side of at least one end cap 7. An annular groove is provided on the inner circumference of the annular member 16. Several through holes communicating with the bottom side of the annular groove are opened on the annular member 16.

[0069] The working process and principle of this embodiment are as follows: After the motor housing rotates and the coolant inside the motor housing forms an annular liquid layer, at least one guide element 13 causes the coolant in the annular liquid layer to change its direction of movement and enter the annular groove of the annular element 16. The coolant in the annular groove falls onto the stator 11 through the through hole, so that the coolant can directly contact the stator core and stator winding of the stator 11, thereby improving the heat exchange efficiency.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A hub motor cooling structure, mounted on a hub motor, characterized in that: Includes a blower (1), a first connecting pipe (2), a second connecting pipe (4), a venturi tube (9), and no fewer than two oil inlet pipes (8); The hub motor includes a fixed shaft (5), a motor housing, a rotor (12), and a stator (11). Insulating coolant is added into the motor housing. The rotation of the motor housing can cause the coolant to form a continuous annular liquid layer on the circumferential wall surface of the inner cavity of the motor housing or to accumulate on one side of the lower part of the inner cavity of the motor housing. The fixed shaft (5) is provided with an air inlet channel and an air outlet channel that connect the inside and outside of the motor housing. The air outlet channel, the first connecting pipe (2), the fan (1), the second connecting pipe (4), the air inlet channel, and the inner cavity of the motor housing are connected end to end in sequence to form a gas unidirectional circulation path. The gas enters the inner cavity of the motor housing through the air inlet channel in the flow path. The connection port of the air inlet channel located inside the motor housing is connected to the driving gas inlet of the venturi tube (9). The oil inlet pipe (8) is fixedly installed on the stator (11). One end of the oil inlet pipe (8) is connected to the negative pressure port of the venturi tube (9). The other end of the oil inlet pipe (8) passes the stator (11) radially along the fixed shaft (5) and faces the rotation direction of the annular liquid layer.

2. The hub motor cooling structure according to claim 1, characterized in that: in, During the process of coolant accumulating on one side of the low position inside the motor housing cavity, at least one end of the oil inlet pipe (8) is inserted into the coolant.

3. The hub motor cooling structure according to claim 2, characterized in that: The air intake channel is located in the connection port inside the motor housing and is connected to one end of the conduit (10). A spiral flow channel (14) is provided inside the conduit (10).

4. The hub motor cooling structure according to claim 1, characterized in that: A deformable container (3) is installed on the first connecting pipe (2), and an oil-gas separation component is provided inside the container (3).

5. A hub motor, characterized in that: Includes the hub motor cooling structure as described in any one of claims 1-4.

6. The hub motor according to claim 5, characterized in that: The motor housing includes two end caps (7) rotatably mounted on a fixed shaft (5), an annular shell (6) is fixedly installed between the two end caps (7), and at least one end cap (7) has a plurality of openings facing the rotation direction of the annular liquid layer in the inner side of the end cap (7).

7. The hub motor according to claim 6, characterized in that: The outer side of the receiving groove (15) is provided with a micropore that connects to the bottom side of the inner cavity of the receiving groove (15).

8. The hub motor according to claim 6, characterized in that: The angle between the opening of each receiving slot (15) and the radial direction of the fixed shaft (5) is different.

9. A hub motor cooling structure, mounted on a hub motor, characterized in that: Includes no fewer than two drainage components (13); The hub motor includes a fixed shaft (5), a motor housing, a rotor (12) and a stator (11). Insulating coolant is added into the motor housing. The rotation of the motor housing can cause the coolant to form an annular liquid layer on the circumferential wall surface of the inner cavity of the motor housing or to accumulate on one side of the lower part of the inner cavity of the motor housing. The drainage component (13) is an arc-shaped blade with a concave surface facing the rotation direction of the annular liquid layer or a rigid tube with one end facing the rotation direction of the annular liquid layer. The drainage component (13) is fixedly installed on the stator (11). The guide element (13) causes a portion of the coolant in the annular liquid layer to change its direction of movement and collide with the stator (11) and / or the fixed shaft (5).

10. The hub motor cooling structure according to claim 9, characterized in that: The motor housing includes two end caps (7) rotatably mounted on a fixed shaft (5), an annular shell (6) is fixedly installed between the two end caps (7), and an annular component (16) is installed on the inner side of at least one end cap (7). The annular component (16) has an annular groove on its inner circumference and several through holes communicating with the bottom side of the annular groove are opened on the annular component (16). During the process of the motor housing rotating to form an annular liquid layer of coolant inside the motor housing, a portion of the guide element (13) causes the coolant in the annular liquid layer to change its direction of movement and enter the annular groove of the annular element (16), and the coolant in the annular groove falls onto the stator (11) through the through hole.

Images