Liquid-cooled hub motor with ventilation device mounted on end cover and electric vehicle

Abstract

The utility model relates to the technical field of hub motors, and particularly discloses a liquid-cooled hub motor with a ventilation device mounted on an end cover and an electric vehicle. The motor comprises a supporting shaft, a stator and a hub, the stator and the hub are arranged on the supporting shaft, the hub comprises two end covers which are oppositely arranged, a cavity is formed in the hub, the stator is located in the cavity, and cooling liquid is further arranged in the cavity; wherein one end cover is provided with an annular air guide cavity surrounding the supporting shaft, the end cover is further provided with a ventilation device, a ventilation pipe is arranged in the cavity, one end of the ventilation pipe is communicated with the ventilation device, and the other end of the ventilation pipe is communicated with the annular air guide cavity. The annular air guide cavity communicates with the interior of the cavity. According to the liquid-cooled hub motor, the annular air guide cavity is combined with the ventilation pipe, and the annular air guide cavity serves as a connection channel between the cavity and the external environment, so that cooling liquid can be effectively prevented from invading the ventilation device, the service life of the ventilation device is effectively prolonged, and the operation stability of the liquid-cooled hub motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hub motors, and specifically discloses a liquid-cooled hub motor with a breathable device installed on an end cover and an electric vehicle. Background Art

[0002] Traditional hub motors usually use air cooling to dissipate heat. Their internal structure is relatively simple and they mainly rely on air flow to remove the heat generated by the motor when it is working. In order to maintain the air pressure balance inside and outside the motor, these air-cooled hub motors are equipped with a ventilator that allows air to circulate freely while preventing moisture and impurities from entering the motor, ensuring that the motor can operate stably under various environmental conditions.

[0003] As a highly efficient heat dissipation technology, liquid-cooled hub motors use coolant circulation to absorb and disperse heat. Compared with traditional air cooling, liquid cooling technology significantly improves heat dissipation efficiency, allowing the motor to operate at higher power and more stringent working conditions. However, due to the presence of coolant, liquid-cooled hub motors cannot simply use traditional ventilation devices. General ventilation valves cannot effectively isolate oil and other contaminants in the coolant. These substances may clog the ventilation valve, affect its normal operation, and even cause motor performance degradation or damage.

[0004] In order to meet the special requirements of liquid-cooled hub motors, existing technologies have proposed a solution of using an oil-proof breathable valve. As shown in patent CN210608830U, the setting of the oil-proof breathable valve is intended to achieve the breathable function while preventing the leakage of insulating cooling oil. However, the oil-proof breathable valve of the prior art mainly relies on special membrane materials to achieve the oil-proof function. This material-dependent method has certain limitations. The membrane material may gradually fail due to aging, wear or chemical corrosion, resulting in reduced durability and reliability. In addition, the performance of the membrane material may also be affected by environmental factors such as temperature and humidity, further limiting its application in liquid-cooled hub motors. Therefore, it is necessary to develop a new structural design to achieve an effective oil-proof breathable function through physical structure rather than material properties, so as to improve the long-term stability and ease of maintenance of liquid-cooled hub motors. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a liquid-cooled hub motor and an electric vehicle with a breathable device installed at the end cover.

[0006] On the one hand, the utility model discloses a liquid-cooled hub motor with a breathable device installed on the end cover, which adopts the following technical solution:

[0007] A liquid-cooled hub motor with a breathable device installed on an end cover comprises a support shaft, a stator and a hub arranged on the support shaft, the hub comprising two end covers arranged opposite to each other, a chamber is formed in the hub, the stator is located in the chamber, and a coolant is also provided in the chamber; one of the end covers is provided with an annular air guide cavity surrounding the support shaft, the end cover is also provided with a breathable device, a vent pipe is provided in the chamber, one end of the vent pipe is connected to the breathable device, and the other end of the vent pipe is connected to the annular air guide cavity; the annular air guide cavity is connected to the inside of the chamber.

[0008] Preferably, the end cover is provided with a mounting groove, the mounting groove is provided with a vent hole, the ventilation device is arranged in the mounting groove, and one end of the ventilation pipe is connected to the vent hole.

[0009] Preferably, the end cover is provided with a mounting hole, the ventilation device is installed in the mounting hole, a connecting cover is provided at one end of the mounting hole in the chamber, and one end of the ventilation pipe is connected to the ventilation device through the connecting cover.

[0010] Preferably, an air guide channel communicating with the annular air guide cavity is provided on the end cover, and the other end of the ventilation pipe is communicated with the air guide channel.

[0011] Preferably, the end cover comprises a cover body, an axial hole is provided in the middle of the cover body, a bearing and a first oil seal are provided in the axial hole, the bearing and the oil seal are sleeved on the support shaft, and the annular air guide cavity is located between the bearing and the first oil seal.

[0012] Preferably, a second oil seal is further provided in the shaft hole, and the second oil seal is arranged on a side of the bearing away from the chamber, and the annular air guide cavity is located between the first oil seal and the second oil seal.

[0013] Preferably, an oil-repellent component is provided on a side of the bearing close to the annular air guide cavity.

[0014] Preferably, an oil absorbing material is provided in the annular air guiding cavity.

[0015] Preferably, the ventilation device is a ventilation valve.

[0016] On the other hand, the utility model discloses an electric vehicle, which adopts the following technical solution:

[0017] An electric vehicle comprises a frame, a hub motor arranged on the frame, a tire arranged on the hub motor, and a battery and a controller arranged on the frame. The hub motor is a liquid-cooled hub motor with a breathable device installed on the end cover.

[0018] Compared with the prior art, the utility model has at least the following beneficial effects:

[0019] The utility model combines the annular air guide cavity with the vent pipe, and the annular air guide cavity serves as a connecting channel between the chamber and the external environment. The air guide port of the air permeable device is guided into the annular air guide cavity through the vent pipe. Compared with the traditional air permeable device that directly places the air guide port in the chamber, this design method can more effectively prevent the coolant from invading the air permeable device, thereby avoiding the problem of affecting the normal operation of the equipment, effectively extending the service life of the air permeable device, and significantly improving the operating stability of the liquid-cooled hub motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of the liquid-cooled hub motor of Embodiment 1;

[0021] Figure 2 for Figure 1 A enlarged view of .

[0022] Description of Figure Numbers:

[0023] 1. Support shaft; 11. Bearing; 12. Annular air guide cavity; 13. First oil seal; 2. Stator; 21. Stator bracket; 211. Stator inner cavity; 212. Hole position; 22. Stator core; 3. Wheel hub; 31. End cover; 311. Mounting groove; 312. Air vent; 313. Air guide duct; 4. Chamber; 5. Coolant; 6. Inner channel of shaft; 7. Outer pipe of shaft; 8. Ventilation pipe; 9. Breathing device. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example 1

[0026] This embodiment discloses a liquid-cooled hub motor with a breathable device installed at the end cover, referring to Figure 1-2 , which comprises a support shaft 1, a stator 2 and a hub 3 arranged on the support shaft 1, wherein the hub 3 comprises a rim and end covers 31 on both sides of the rim, a chamber 4 is formed in the hub 3, the stator 2 is located in the chamber 4, and a coolant 5 is also arranged in the chamber 4. An annular air guide cavity 12 surrounding the support shaft 1 is arranged on one of the end covers 31, and a ventilating device 9 is also arranged on the end cover 31, and a ventilating pipe 8 is arranged in the chamber 4, one end of the ventilating pipe 8 is connected to the ventilating device 9, and the other end of the ventilating pipe 8 is connected to the annular air guide cavity 12; the annular air guide cavity 12 is connected to the inside of the chamber 4.

[0027] By setting up an annular air guide cavity 12 and a vent pipe 8 to cooperate with each other, and using the annular air guide cavity 12 as a channel connecting the inside and outside of the chamber 4, the air guide port of the air permeable device 9 is transferred to the annular air guide cavity 12 through the vent pipe 8. In this way, compared with the air guide port of the existing air permeable device set in the chamber 4, the oil protection effect is better, which not only greatly avoids the problem of coolant 5 contaminating the air permeable device 9 and affecting normal operation or oil leakage, but also improves the operation reliability of the liquid-cooled hub motor. Moreover, the end cover 31 provided with the annular air guide cavity 12 and the vent pipe 8 can be improved on the traditional air-cooled hub motor, that is, it can be applied to liquid-cooled hub electronics. This solution provides a feasible solution for the upgrade of hub electronics.

[0028] Specifically, the end cover 31 includes a cover body, a shaft hole is provided in the middle of the cover body, a bearing 11 and a first oil seal 13 are provided in the shaft hole, the bearing 11 and the first oil seal 13 are sleeved on the support shaft 1, and the annular air guide cavity 12 is located between the bearing 11 and the first oil seal 13. In this way, not only the air permeability function and oil-proof function of the air permeable device 9 are satisfied, but also the space between the existing wheel hub electronic bearing 11 and the first oil seal 13 is cleverly utilized, so that the structure of the wheel hub motor itself is beneficially applied. As a preferred solution, a second oil seal (not shown in the figure) is also provided in the shaft hole, and the second oil seal is provided on the side of the bearing 11 away from the chamber 4, and the annular air guide cavity 12 is located between the first oil seal 13 and the second oil seal. In addition, an oil-repellent component, such as an oil-repellent film, is provided on the side of the bearing 11 close to the annular air guide cavity 12, so that the situation of axial oil leakage to the annular air guide cavity 12 can be further avoided.

[0029] In this embodiment, the breathable device 9 can be a breathable valve, the end cover 31 is provided with a mounting groove 311, the mounting groove 311 is provided with a vent hole 312, the breathable device 9 is arranged in the mounting groove 311, and one end of the vent pipe 8 is connected to the vent hole 312. The end cover 31 is provided with an air guide 313 connected to the annular air guide cavity 12, and the other end of the vent pipe 8 is connected to the air guide 313. Of course, in other embodiments, the conventional breathable valve installation method of the air-cooled hub motor can also be adopted, that is, the end cover 31 is provided with a mounting hole, the breathable device is installed in the mounting hole, and a connecting cover is provided at one end of the mounting hole located in the chamber 4, and one end of the vent pipe 8 is connected to the breathable device 9 through the connecting cover, and the end cover 31 of the air-cooled hub motor can also be upgraded to be applied to the liquid-cooled hub motor. As a preferred solution, the outer periphery of the ports at both ends of the vent pipe 8 is provided with sealant for sealing connection, so as to further improve the oil-proof effect.

[0030] In this embodiment, the stator 2 includes a stator bracket 21 fixed on the support shaft and a stator core 22 arranged on the outer periphery of the stator bracket 21. The stator bracket 21 includes a first bracket monolithic sheet and a second bracket monolithic sheet that are interlocked with each other, and a stator inner cavity 211 is formed between the first bracket monolithic sheet and the second bracket monolithic sheet. The stator bracket 21 has some holes 212 such as positioning holes, and the holes 212 connect the stator inner cavity 211 with the chamber 4. The support shaft 1 is provided with an inner shaft channel 6 connected to the annular air guide cavity 12, and the chamber 4 is provided with an outer shaft pipe 7 connected to the inner shaft channel 6. The port of the outer shaft pipe 7 extends into the stator inner cavity 211 through the hole 212. The inner shaft channel 6 and the outer shaft pipe 7 constitute a permeable channel, which can realize the communication between the annular air guide cavity 12 and the chamber 4. Of course, in other embodiments, the permeable channels can also be all set as inner shaft channels, or a sleeve with a permeable channel can be set on the support shaft 1, and the annular air guide cavity can be connected with the chamber. As a preferred solution, an oil-absorbing material is provided in the annular air guide cavity 12. The oil-absorbing material does not cause blockage to the annular air guide cavity 12. Even if a small amount of coolant enters the annular air guide cavity 12, the oil-absorbing material can absorb the coolant that cannot return to the chamber 4, thereby preventing the coolant from contaminating and damaging the breathable device 9, thereby extending the service life and reliability of the breathable device.

[0031] Example 2

[0032] This embodiment discloses an electric vehicle, which includes a frame, a hub motor arranged on the frame, a tire arranged on the hub motor, and a battery and a controller arranged on the frame, wherein the hub motor is a liquid-cooled hub motor with a breathable device installed on the end cover of Example 1.

[0033] The technical solution provided by the utility model is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A liquid-cooled hub motor with an end cap mounted venting device, comprising a support shaft, a stator and a hub arranged on the support shaft, the hub comprising two end caps arranged opposite to each other, a chamber formed in the hub, the stator being located in the chamber, and a cooling liquid being arranged in the chamber; characterized in that: One of the end covers is provided with an annular air guide cavity surrounding the support shaft, and the end cover is also provided with a ventilation device. A ventilation pipe is provided in the chamber, one end of the ventilation pipe is connected to the ventilation device, and the other end of the ventilation pipe is connected to the annular air guide cavity; the annular air guide cavity is connected to the inside of the chamber.

2. The liquid-cooled hub motor with a breathable device mounted on the end cover according to claim 1, characterized in that: The end cover is provided with a mounting groove, the mounting groove is provided with a vent hole, the ventilation device is arranged in the mounting groove, and one end of the ventilation pipe is connected to the vent hole.

3. The liquid-cooled hub motor with a breathable device mounted on the end cover according to claim 1, characterized in that: The end cover is provided with a mounting hole, the ventilation device is installed in the mounting hole, one end of the mounting hole in the chamber is provided with a connecting cover, and one end of the ventilation pipe is connected with the ventilation device through the connecting cover.

4. The liquid-cooled hub motor with a breathable device mounted on the end cover according to any one of claims 1 to 3, characterized in that: An air guide channel connected to the annular air guide cavity is provided on the end cover, and the other end of the ventilation pipe is connected to the air guide channel.

5. The liquid-cooled hub motor with a breathable device mounted on the end cover according to any one of claims 1 to 3, characterized in that: The end cover comprises a cover body, a shaft hole is provided in the middle of the cover body, a bearing and a first oil seal are provided in the shaft hole, the bearing and the oil seal are sleeved on the supporting shaft, and the annular air guide cavity is located between the bearing and the first oil seal.

6. The liquid-cooled hub motor with a breathable device mounted on the end cover according to claim 5, characterized in that: A second oil seal is also provided in the shaft hole. The second oil seal is arranged on a side of the bearing away from the chamber. The annular air guide cavity is located between the first oil seal and the second oil seal.

7. The liquid-cooled hub motor with a breathable device mounted on the end cover according to claim 5, characterized in that: An oil-repellent component is provided on one side of the bearing close to the annular air guide cavity.

8. The liquid-cooled hub motor with a breathable device mounted on the end cover according to any one of claims 1 to 3, characterized in that: An oil absorbing material is arranged in the annular air guiding cavity.

9. The liquid-cooled hub motor with a breathable device mounted on the end cover according to any one of claims 1 to 3, characterized in that: The ventilation device is a ventilation valve.

10. An electric vehicle, comprising a frame, a hub motor mounted on the frame, a tire mounted on the hub motor, a battery mounted on the frame, and a controller, wherein: The hub motor is a liquid-cooled hub motor with an end cover mounted breathable device as described in any one of claims 1 to 9.

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