Liquid-cooled hub motor with shaft sleeve 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 shaft sleeve and an electric vehicle. The motor comprises a shaft rod, a stator and a hub, 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 shaft rod, the end cover is further provided with a ventilation device, and the ventilation device is communicated with the annular air guide cavity. A shaft sleeve is further arranged between the shaft rod and the end cover and provided with a ventilation channel, one end, outside the cavity, of the ventilation channel is communicated with the annular air guide cavity, one end, inside the cavity, of the ventilation channel is connected with an air guide pipe, and one end of the air guide pipe is located at the stator. According to the hub motor, the annular air guide cavity serves as an intermediary for air circulation between the cavity and the outside, so that air pressure inside and outside the hub cavity can be balanced through the ventilation channel of the shaft sleeve and the air guide pipe, the structural integrity of the shaft rod is reserved, and the operation reliability of the hub motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel hub motors, and specifically discloses a liquid-cooled wheel hub motor with a shaft sleeve and an electric vehicle. Background Art

[0002] Liquid-cooled hub motors are a highly efficient motor heat dissipation technology that is widely used in the field of electric vehicles. The core principle is to circulate cooling liquid inside the motor to quickly transfer the heat generated during the operation of the motor to the external environment, thereby reducing the temperature of the motor and improving its working efficiency and service life. In this motor design, the breather is an indispensable component, which can effectively balance the air pressure inside and outside the motor to prevent motor failure caused by excessive pressure difference. Traditional liquid-cooled hub motors usually arrange a vent pipe through the shaft hole in the shaft, and then connect the breather to achieve air pressure balance and heat dissipation.

[0003] At present, the liquid-cooled hub motors on the market generally adopt the method of arranging a vent pipe inside the rotating shaft to connect a breathable device, such as the one disclosed in patent CN108880109B. Although such a layout helps to discharge heat, in actual operation, it requires that the inner diameter of the shaft hole of the rotating shaft must be large enough to accommodate the vent pipe and other cables, which requires increasing the diameter of the shaft hole or adjusting the size ratio of the rotating shaft. Although this adjustment meets the installation requirements of the vent pipe, it also has an adverse effect on the structural strength of the rotating shaft. The rotating shaft is the key to supporting the motor, and any reduction in its strength may increase the risk of motor failure. In addition, increasing the size of the rotating shaft runs counter to the current market demand for miniaturization.

[0004] In view of the limitations of the existing technology in the installation of breathable devices, as well as the dual demands for motor miniaturization and heat dissipation efficiency, the market urgently needs a new hub motor structure that can effectively achieve the installation of the breathable device without sacrificing the strength of the shaft. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a liquid-cooled hub motor with a shaft sleeve and an electric vehicle.

[0006] On the one hand, the utility model discloses a liquid-cooled hub motor with a shaft sleeve, which adopts the following technical solution:

[0007] A liquid-cooled hub motor with a shaft sleeve comprises a shaft, a stator and a hub arranged on the 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 arranged in the chamber; one of the end covers is provided with an annular air guide cavity surrounding the shaft, and the end cover is also provided with a breathable device, and the breathable device is communicated with the annular air guide cavity; a shaft sleeve is also provided between the shaft and the end cover, and the shaft sleeve is provided with an air permeable channel, and the air permeable channel is communicated with the annular air guide cavity at one end outside the chamber, and the air permeable channel is connected to an air guide pipe at one end inside the chamber, and one end of the air guide pipe is located at the stator.

[0008] Preferably, the stator comprises a stator bracket fixed on the shaft and a stator core arranged on the outer periphery of the stator bracket, a stator inner cavity communicating with the chamber is arranged in the stator bracket, and the other end of the air guide tube is communicated with the stator inner cavity.

[0009] Preferably, the air permeable channel is arranged in the shaft sleeve in an inclined downward direction from outside the chamber to inside the chamber.

[0010] Preferably, the end cover comprises a cover body, the middle part of the cover body has an axial hole, a bearing and an outer oil seal are arranged in the axial hole, the bearing and the outer oil seal are sleeved on the shaft, and the annular air guide cavity is located between the bearing and the outer oil seal.

[0011] Preferably, an inner oil seal is provided between the shaft sleeve and the bearing in the annular air guide cavity.

[0012] Preferably, an oil absorbing material is provided in the annular air guiding cavity.

[0013] Preferably, the end of the air guide tube located in the inner cavity of the stator is located between the axis and the outer edge of the stator.

[0014] Preferably, an oleophobic component is provided inside or at the end of the air permeable channel.

[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 the above-mentioned liquid-cooled hub motor with a shaft sleeve.

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

[0019] The utility model designs an annular air guide cavity around the shaft rod, and installs a sleeve with an air permeable channel on one side of the shaft rod. The annular air guide cavity acts as an intermediary for the air circulation between the chamber and the outside, so that the internal and external air pressures of the hub chamber can be balanced through the air permeable channel of the sleeve and the air guide tube. Compared with the prior art, this design retains the structural integrity of the shaft rod and improves the operating reliability of the liquid-cooled hub motor. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Description of Figure Numbers:

[0023] 1. Shaft; 11. Bearing; 12. Annular air duct; 13. External oil seal; 14. Sealing ring; 2. Stator; 21. Stator bracket; 211. Stator inner cavity; 212. Process hole; 22. Stator core; 3. Hub; 31. End cover; 4. Chamber; 5. Coolant; 6. Bushing; 61. Air passage; 7. Air duct; 8. Air permeability device. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, 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 shaft sleeve, such as Figure 1-2 As shown, it includes a shaft 1, a stator 2 and a hub 3 arranged on the shaft 1, wherein the hub 3 includes 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 shaft 1 is arranged on one of the end covers 31. A breathable device 8 is also arranged on the end cover 31, and the breathable device 8 is connected to the annular air guide cavity 12. A sleeve 6 is also arranged between the shaft 1 and the end cover 31, and a breathable channel 61 is arranged on the sleeve 6, and the breathable channel 61 is connected to the annular air guide cavity 12, and one end of the breathable channel 61 outside the chamber 4 is connected to the annular air guide cavity 12, and one end of the breathable channel 61 inside the chamber 4 is connected to an air guide pipe 7, and one end of the air guide pipe 7 is located at the stator 2.

[0027] An annular air guide cavity 12 is arranged around the shaft 1, and a sleeve 6 with an air permeable channel 61 is sleeved on the side of the shaft 1 close to the annular air guide cavity 12, so that the annular air guide cavity 12 serves as an intermediate cavity for air circulation inside and outside the connecting chamber 4. The air pressure inside and outside the hub chamber 4 can be balanced through the air permeable channel 61 of the sleeve 6 and the air guide pipe 7. Compared with the existing structure in which the air pipe is arranged through the axial hole of the shaft 1, the sleeve 6 of this scheme has the air permeable channel 61 which will not affect the structural strength of the shaft 1, thereby realizing the installation of the air permeable device 8 of the hub motor while taking into account the operating reliability of the hub motor.

[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 an outer oil seal 13 are provided in the shaft hole, the bearing 11 and the outer oil seal 13 are sleeved on the shaft 1, and an annular air guide cavity 12 surrounding the shaft 1 is formed on one of the end covers 31, the annular air guide cavity 12 is located between the bearing 11 and the outer oil seal 13, and the air permeability device 8 can be an air permeability valve. By cleverly utilizing the space between the existing hub electronic bearing 11 and the outer oil seal 13, the air permeability device 8 provided on the end cover 31 can continue to remain on the end cover 31, and even if it is in a rotating state, it does not affect the air permeability requirements of the hub motor. An oil-absorbing material can be provided in the annular air guide cavity 12, and the oil-absorbing material does not cause blockage to the annular air guide cavity 12. Even if a small amount of coolant 5 enters the annular air guide cavity 12, the oil-absorbing material can absorb the coolant 5 that cannot return to the chamber 4, thereby avoiding the coolant 5 from polluting and damaging the air permeability device 8, and extending the service life and reliability of the air permeability device 8.

[0029] As a preferred solution, the stator 2 includes a stator bracket 21 fixed on the shaft 1 and a stator core 22 arranged on the outer periphery of the stator bracket 21. The stator bracket 21 includes a first bracket monolithic piece and a second bracket monolithic piece that are interlocked with each other, and a stator inner cavity 211 is formed between the first bracket monolithic piece and the second bracket monolithic piece. The stator bracket 21 has a process hole 212 such as a positioning hole, and the process hole 212 connects the stator inner cavity 211 with the chamber 4. The other end of the air duct 7 away from the air permeable channel 61 is connected to the stator inner cavity 211 through the process hole 212. By extending the air duct 7 into the stator inner cavity 211, since the coolant 5 in the chamber 4 is not easy to flow into or splash into the stator inner cavity 211, it is better to prevent the coolant 5 from entering the air duct 7, and better prevent the coolant 5 from contaminating and clogging the air permeable device 8. In addition, the end of the air duct 7 in the stator inner cavity 211 is preferably arranged between the stator axis and the outer edge, which can avoid the coolant 5 in the chamber 4 from contacting the mouth of the air duct 7 to the greatest extent, thereby ensuring the reliability of the product.

[0030] As a preferred solution, the air permeable channel 61 is arranged in the shaft sleeve 6 in a direction from the outside of the chamber 4 to the inside of the chamber 4, that is, the end of the air permeable channel 61 close to the chamber 4 is lower than the end of the air permeable channel 61 away from the chamber 4, so that even if part of the coolant 5 enters the air permeable channel 61, due to the inclination of the air permeable channel 61, the coolant 5 slides out under the action of gravity, further reducing the possibility of the coolant 5 contaminating the air permeable device 8. In addition, in order to further reduce the risk of the coolant 5 entering the air permeable channel 61 and contaminating the air permeable device 8, a breathable and oleophobic component, such as an oleophobic breathable membrane, is encapsulated in the groove or the air guide 7.

[0031] As a preferred solution, double oil seals can be provided on both sides of the annular air guide cavity 12 at the shaft hole of the end cover 31. That is, an outer oil seal 13 is provided on the side of the annular air guide cavity 12 away from the chamber 4, and an inner oil seal is provided on the side of the annular air guide cavity 12 close to the chamber 4. The inner oil seal is located between the shaft sleeve 6 and the bearing 11, that is, the inner diameter of the inner oil seal is equal to the outer diameter of the shaft sleeve 6, thereby further sealing the bearing 11 and the shaft sleeve 6, so that the sealing between the shaft sleeve 6 and the bearing 11 is better, thereby greatly reducing the risk of axial oil and air inflow into the annular air guide cavity 12, and reducing the risk of internal coolant 5 entering the annular air guide cavity 12, thereby improving the reliability and stability of the breathable device 8. In addition, referring to Figure 2 A sealing ring 14 may also be provided between the shaft sleeve 6 and the bearing 11 in the chamber 4 , which can also better prevent the coolant 5 from penetrating into the annular air guide cavity 12 .

[0032] Example 2

[0033] 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 sleeve according to Embodiment 1. This electric vehicle adopts the above liquid-cooled hub motor, has good operating stability, low maintenance cost, better heat dissipation performance, and higher reliability.

[0034] 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 a shaft sleeve, comprising a shaft, a stator and a hub arranged on the shaft, wherein the hub comprises 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 arranged in the chamber; characterized in that: One of the end covers is provided with an annular air guide cavity surrounding the shaft rod, and the end cover is also provided with a ventilation device, and the ventilation device is connected to the annular air guide cavity; a sleeve is also provided between the shaft rod and the end cover, and the sleeve is provided with an air permeable channel, and the air permeable channel is connected to the annular air guide cavity at one end outside the cavity, and the air permeable channel is connected to an air guide pipe at one end inside the cavity, and one end of the air guide pipe is located at the stator.

2. The liquid-cooled hub motor with a sleeve according to claim 1, characterized in that: The stator comprises a stator bracket fixed on the shaft and a stator core arranged on the outer periphery of the stator bracket. A stator inner cavity communicating with the chamber is arranged in the stator bracket, and the other end of the air guide tube is communicated with the stator inner cavity.

3. The liquid-cooled hub motor with a sleeve according to claim 1, characterized in that: The air permeable channel is arranged in the shaft sleeve in an inclined downward direction from outside the chamber to inside the chamber.

4. The liquid-cooled hub motor with a sleeve 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 an outer oil seal are arranged in the shaft hole, the bearing and the outer oil seal are sleeved on the shaft, and the annular air guide cavity is located between the bearing and the outer oil seal.

5. The liquid-cooled hub motor with a sleeve according to claim 4, characterized in that: An inner oil seal is arranged between the shaft sleeve and the bearing in the annular air guide cavity.

6. The liquid-cooled hub motor with a sleeve according to any one of claims 1 to 3, characterized in that: An oil absorbing material is arranged in the annular air guiding cavity.

7. The liquid-cooled hub motor with a sleeve according to any one of claims 1 to 3, characterized in that: The end of the air guide tube located in the inner cavity of the stator is located between the axis and the outer edge of the stator.

8. The liquid-cooled hub motor with a sleeve according to any one of claims 1 to 3, characterized in that: An oleophobic component is provided inside or at the end of the air permeable channel.

9. The liquid-cooled hub motor with a sleeve 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 a shaft sleeve as described in any one of claims 1 to 9.

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