Liquid-cooled hub motor with supporting shaft provided with groove and electric vehicle

Abstract

The utility model relates to the technical field of hub motors, and specifically discloses a liquid-cooled hub motor with a supporting shaft provided with a groove, 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 between the two end covers, the stator is located in the cavity, and cooling liquid is further arranged in the cavity; a groove is formed in the surface of the supporting shaft, the shaft hole in one end cover is opposite to the groove, and the two ends of the groove are communicated with the inner side and the outer side of the cavity respectively. One end of the air guide pipe extends into the cavity and is positioned at the stator, and the other end of the air guide pipe extends out of the cavity; a ventilation device is arranged outside the cavity and communicated with the air guide pipe outside the cavity. According to the hub motor, the groove is designed on the supporting shaft and the air guide pipe is installed on the supporting shaft, so that the risk that the ventilation device is blocked due to the pollution of cooling liquid is reduced, the operation reliability of the hub motor is improved, the process of forming the groove on the supporting shaft is simple and convenient, and the production and assembly efficiency 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 supporting shaft provided with grooves and an electric vehicle. Background Art

[0002] With the rapid development of new energy vehicles and high-speed motor applications, the performance requirements for motors are getting higher and higher. Traditional air cooling methods can no longer meet the heat dissipation requirements of high-power density and high-speed motors due to their limited cooling efficiency. Liquid cooling technology has gradually become the preferred solution for motor cooling due to its efficient thermal conductivity. Liquid-cooled motors quickly remove the heat generated between the stator and rotor inside the motor through the circulation of coolant, thereby effectively reducing the operating temperature of the motor and improving its performance and service life.

[0003] In addition, existing hub motors are usually equipped with ventilation devices to balance the air pressure inside and outside the chamber, and to avoid excessive pressure in the chamber through gas exchange. For example, patent CN210608830U discloses a new type of oil-injected motor with an efficient gas exchange system. The patent sets a first oil-proof ventilation valve and a second oil-proof ventilation valve. Under the action of the internal and external pressure difference, part of the air is discharged to the outside of the casing through the gas exchange component after the oil is removed by the first oil-proof ventilation valve, and part of the gas is discharged to the outside of the casing after the oil is removed by the second oil-proof ventilation valve, so that the air pressure inside and outside the casing is balanced.

[0004] The mechanism of the oil-proof breathable valve is to use hydrophobic materials to prevent water and oil from adhering and penetrating easily, so that the patent uses the oil-proof breathable valve to prevent oil from entering the gas exchange component and causing blockage, thereby maintaining its breathability. However, the reliability of this oil-proof performance relying on materials is poor, and the durability and cost-effectiveness of the materials also need to be considered. In order to solve the above-mentioned oil-proof problem, a liquid-cooled hub motor with a support shaft provided with a groove is proposed. 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 support shaft provided with grooves.

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

[0007] A liquid-cooled hub motor with a support shaft provided with a groove 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, the end covers being provided with an axial hole, the support shaft passing through the axial hole, a chamber being formed between the two end covers, the stator being located in the chamber, and a cooling liquid being also provided in the chamber; a groove is provided on the surface of the support shaft, the axial hole on one of the end covers is opposite to the groove, and the two ends of the groove are connected to the inside and outside of the chamber respectively; an air duct is also provided through the groove, one end of the air duct extends into the chamber and is located at the stator, and the other end of the air duct extends outside the chamber; a ventilation device is provided outside the chamber, and the ventilation device is connected to the air duct outside the chamber.

[0008] Preferably, the stator comprises a stator bracket fixed on a supporting 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 one end of the air guide tube is communicated with the stator inner cavity.

[0009] Preferably, one of the end covers is provided with an annular shaft outer cavity surrounding the support shaft, the air permeable device is arranged on the end cover, and the air permeable device is connected to the annular shaft outer cavity; the other end of the air guide tube is connected to the annular shaft outer cavity.

[0010] A liquid-cooled hub motor with a support shaft provided with a groove 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, the end covers being provided with an axial hole, the support shaft passing through the axial hole, a chamber being formed between the two end covers, the stator being located in the chamber, and a cooling liquid being also provided in the chamber; a groove is provided on the surface of the support shaft, the axial hole on one of the end covers being opposite to the groove, and the two ends of the groove are connected to the inside and outside of the chamber respectively; an air duct is provided in the chamber, one end of the air duct is located at the stator, and the other end of the air duct is connected to one end of the groove in the chamber; a ventilation device is provided outside the chamber, and the ventilation device is connected to one end of the groove outside the chamber.

[0011] Preferably, the stator comprises a stator bracket fixed on a support 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 end of the air duct connected to the stator is located in the stator inner cavity.

[0012] Preferably, one of the end covers is provided with an annular shaft outer cavity surrounding the support shaft, the air permeable device is arranged on the end cover, and the air permeable device is connected with the annular shaft outer cavity; one end of the groove located outside the cavity is connected with the annular shaft outer cavity.

[0013] Preferably, it further comprises an external air duct arranged outside the chamber, one end of the external air duct is connected to one end of the groove outside the chamber, and the other end of the external air duct is connected to the ventilation device.

[0014] Preferably, a mounting hole is provided on the stator bracket, and one end of the air guide pipe extends into the mounting hole.

[0015] Preferably, a second oil seal is provided on a side of the annular shaft outer cavity close to the chamber, and a first oil seal is provided on a side away from the chamber.

[0016] Preferably, the end cover comprises a cover body, a shaft hole is provided in the middle of the cover body, a bearing and an oil seal are provided in the shaft hole, the bearing and the oil seal are sleeved on the supporting shaft, and the annular shaft outer cavity is located between the bearing and the oil seal.

[0017] 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.

[0018] Preferably, the ventilation device is a ventilation valve.

[0019] On the other hand, the utility model also discloses an electric vehicle, which adopts the following technical solution:

[0020] 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 groove on its supporting shaft.

[0021] Compared with the prior art, the utility model has at least the following beneficial effects:

[0022] The utility model designs a groove on the support shaft and installs an air guide tube, so that the air port of the air permeable device in the chamber is located on the stator. Compared with the air permeable device installed on the side wall of the wheel hub chamber in the prior art, the stator is located in the middle of the wheel hub, so it is not easy to be splashed by the coolant, which reduces the risk of the air permeable device being blocked due to coolant contamination, thereby improving the operating reliability of the wheel hub motor. In addition, the process of opening the groove on the support shaft is relatively simple, which not only improves the efficiency of production and assembly, but also facilitates the wide promotion and application of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the liquid-cooled hub motor of Embodiment 1 of the present utility model;

[0024] Figure 2 for Figure 1 A enlarged view of .

[0025] Description of Figure Numbers:

[0026] 1. Support shaft; 11. Bearing; 12. Annular shaft outer cavity; 13. Oil seal; 2. Stator; 21. Stator bracket; 211. Stator inner cavity; 212. Mounting hole; 22. Stator core; 3. Wheel hub; 4. Chamber; 5. Coolant; 6. Groove; 7. Air duct; 8. Breathing device. DETAILED DESCRIPTION

[0027] 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.

[0028] Example 1

[0029] This embodiment discloses a liquid-cooled hub motor with a support shaft having a groove, 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 two end caps arranged opposite to each other, wherein the end caps are provided with shaft holes, through which the support shaft 1 passes, and a chamber 4 is formed between the two end caps, wherein the stator 2 is located in the chamber 4, and a coolant 5 is also arranged in the chamber 4. Among them, a groove 6 is opened on the surface of the support shaft 1, wherein the shaft hole on one of the end caps is opposite to the groove 6, and the two ends of the groove 6 are connected to the inner and outer sides of the chamber 4 respectively; an air guide tube 7 is also arranged in the groove 6, wherein one end of the air guide tube 7 extends into the chamber 4 and is located at the stator 2, and the other end of the air guide tube 7 extends out and is located outside the chamber 4; an air permeable device 8 is arranged outside the chamber 4, and the air permeable device 8 is connected to the air guide tube 7 outside the chamber 4.

[0030] By providing a groove 6 on the support shaft 1 and passing an air duct 7 through the groove 6, since one end of the air duct 7 is connected to the air permeable device 8 outside the chamber 4, and the other end is provided on the stator 2, compared with the existing air valve directly installed on the side wall of the hub chamber 4, the stator 2 located in the middle of the hub is not easily splashed by the coolant 5, so that the air permeable device 8 connected to the air duct 7 is not easily contaminated by the coolant 5 and blocked, thereby improving the operational reliability. In addition, the process of providing the groove 6 on the support shaft 1 is simple, the production and assembly efficiency is high, and it is conducive to promotion and application.

[0031] Specifically, refer to Figure 2The end cover includes a cover body, a shaft hole is provided in the middle of the cover body, a bearing 11 and an oil seal 13 are provided in the shaft hole, and the bearing 11 and the oil seal 13 are sleeved on the support shaft 1. An annular shaft outer cavity 12 surrounding the support shaft 1 is formed on one of the end covers, and the annular shaft outer cavity 12 is located between the bearing 11 and the oil seal 13, that is, the annular shaft outer cavity 12 is located outside the chamber 4 of the hub 3. The other end of the air guide pipe 7 away from the stator 2 is connected to the annular shaft outer cavity 12, and the air permeable device 8 is provided on the end cover. The air permeable device 8 can be a breathable valve, and the air permeable device 8 is connected to the annular shaft outer cavity 12. In this way, the annular shaft outer cavity 12 on the end cover is used as a channel for air permeation between the inside and outside of the chamber 4, and the breathable valve can be provided on the end cover without using an external pipeline to communicate with the breathable device 8. Of course, other pipeline-type breathable devices can also be used to directly connect the air guide pipe 7 with the breathable device 8 without using the annular shaft outer cavity 12.

[0032] In addition to adopting the method of inserting the air guide tube 7 into the groove 6 and directly connecting the air guide tube 7 with the air permeable device 8 outside the chamber 4, the method of connecting the ends of the air guide tube 7 can also be adopted, specifically, the air guide tube 7 is arranged in the chamber 4, one end of the air guide tube 7 is located at the stator 2, the other end of the air guide tube 7 is connected to one end of the groove 6 in the chamber 4, the end of the groove 6 located outside the chamber 4 is connected to the annular shaft outer cavity 12, and the air permeable device 8 is connected to the annular shaft outer cavity 12. Indirect connection between the air permeable device 8 and the air guide tube 7 can also be achieved, and the same oil-proof effect can be achieved. Of course, the conventional external pipe can also be used to directly connect the air permeable device 8 with the groove 6 without using the annular shaft outer cavity 12. In addition, the air permeable device 8 can also be arranged not directly on the end cover, but an external air guide tube is arranged, one end of the external air guide tube is connected to one end of the groove 6 outside the chamber 4, and the other end of the external air guide tube is connected to the air permeable device 8.

[0033] As a preferred solution, the stator 2 includes a stator bracket 21 fixed on the support 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 such as a positioning hole, and the process hole connects the stator inner cavity 211 with the chamber 4, and one end of the air guide pipe 7 is connected with the stator inner cavity 211. By extending the air guide pipe 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 guide pipe 7, and better prevent the coolant 5 from contaminating and blocking the ventilation device 8.

[0034] See also Figure 1, a mounting hole 212 connected to the stator inner cavity 211 is provided on the stator bracket 21, and the end of the air duct 7 is arranged in the stator inner cavity 211 by extending into the mounting hole 212, and the mounting hole 212 is arranged away from other process holes to reduce the small probability of the coolant 5 splashing from the process hole into the air permeable channel. Of course, the air duct 7 can also select one of the process holes away from other holes to enter the stator inner cavity 211. In addition, as a preferred embodiment, the end of the air duct 7 located in the stator inner cavity 211 is located between the stator axis and the outer edge, which can minimize the contact between the coolant 5 in the chamber 4 and the mouth of the air duct 7, thereby ensuring the reliability of the product. In addition, in order to further reduce the risk of the coolant 5 entering the air permeable channel and contaminating the air permeable device 8, a breathable and oleophobic component, such as an oleophobic breathable membrane, is encapsulated in the groove 6 or the air duct 7.

[0035] Example 2

[0036] The difference between this embodiment and embodiment 1 is that double oil seals are provided on both sides of the annular shaft outer cavity 12 at the shaft hole of the end cover. A second oil seal is provided on the side of the annular shaft outer cavity 12 close to the chamber 4 (that is, the side of the bearing 11 away from the chamber 4), and a first oil seal is provided on the side of the annular shaft outer cavity 12 away from the chamber 4, so that the annular shaft outer cavity 12 is located between the first oil seal and the second oil seal. By providing oil seals on both sides of the annular shaft outer cavity 12, the risk of axial oil and air inflow into the annular shaft outer cavity 12 is greatly reduced, the risk of internal coolant 5 entering the annular shaft outer cavity 12 is reduced, and the reliability and stability of the breathable device 8 are improved.

[0037] Example 3

[0038] 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 groove on the support shaft of any one of Embodiments 1-2.

[0039] 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 groove on a support shaft, comprising a support shaft, a stator and a hub arranged on the support shaft, wherein the hub comprises two end covers arranged opposite to each other, an axial hole is arranged on the end cover, the support shaft passes through the axial hole, a chamber is formed between the two end covers, the stator is located in the chamber, and a coolant is also arranged in the chamber; characterized in that: The support shaft surface is provided with a groove, wherein the shaft hole on one end cover is opposite to the groove, and the two ends of the groove are connected to the inside and outside of the chamber respectively; and an air guide pipe is also provided through the groove, wherein one end of the air guide pipe extends into the chamber and is located at the stator, and the other end of the air guide pipe extends out of the chamber; A ventilation device is provided outside the chamber, and the ventilation device is communicated with an air duct outside the chamber.

2. The liquid-cooled hub motor with a grooved support shaft according to claim 1, characterized in that: The stator comprises a stator bracket fixed on a supporting 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 one end of the air guide pipe is communicated with the stator inner cavity.

3. The liquid-cooled hub motor with a grooved support shaft according to claim 1, characterized in that: One of the end covers is provided with an annular shaft outer cavity surrounding the support shaft, and the air permeable device is arranged on the end cover, and the air permeable device is connected with the annular shaft outer cavity; the other end of the air guide tube is connected with the annular shaft outer cavity.

4. A liquid-cooled hub motor with a support shaft having a groove, comprising a support shaft, a stator and a hub arranged on the support shaft, wherein the hub comprises two end covers arranged opposite to each other, an axial hole is arranged on the end cover, the support shaft passes through the axial hole, a chamber is formed between the two end covers, the stator is located in the chamber, and a coolant is also arranged in the chamber; characterized in that: A groove is provided on the surface of the support shaft, wherein the shaft hole on one of the end covers is opposite to the groove, and the two ends of the groove are respectively connected to the inside and outside of the chamber; an air duct is provided in the chamber, one end of the air duct is located at the stator, and the other end of the air duct is connected to one end of the groove in the chamber; a ventilation device is provided outside the chamber, and the ventilation device is connected to one end of the groove outside the chamber.

5. The liquid-cooled hub motor with a grooved support shaft according to claim 4, characterized in that: The stator comprises a stator bracket fixed on a supporting 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 end of the air guide pipe connected to the stator is located in the stator inner cavity.

6. The liquid-cooled hub motor with a grooved support shaft according to claim 4, characterized in that: One of the end covers is provided with an annular shaft outer cavity surrounding the support shaft, and the air permeable device is arranged on the end cover, and the air permeable device is connected with the annular shaft outer cavity; one end of the groove outside the cavity is connected with the annular shaft outer cavity.

7. The liquid-cooled hub motor with a grooved support shaft according to claim 4, characterized in that: It also includes an external air guide tube arranged outside the chamber, one end of the external air guide tube is connected to one end of the groove outside the chamber, and the other end of the external air guide tube is connected to the ventilation device.

8. The liquid-cooled hub motor with a grooved support shaft according to claim 2 or 5, characterized in that: The stator bracket is provided with a mounting hole, and one end of the air guide pipe extends into the mounting hole.

9. The liquid-cooled hub motor with a grooved support shaft according to claim 3 or 6, characterized in that: A second oil seal is arranged on a side of the annular shaft outer cavity close to the chamber, and a first oil seal is arranged on a side away from the chamber.

10. The liquid-cooled hub motor with a grooved support shaft according to claim 3 or 6, 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 oil seal are arranged in the shaft hole, the bearing and the oil seal are sleeved on the supporting shaft, and the annular shaft outer cavity is located between the bearing and the oil seal.

11. The liquid-cooled hub motor with a grooved support shaft according to claim 2 or 5, 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.

12. The liquid-cooled hub motor with a grooved support shaft according to any one of claims 1 to 7, characterized in that: The ventilation device is a ventilation valve.

13. 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 groove on the support shaft as described in any one of claims 1 to 12.

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