Liquid-cooled hub motor capable of preventing oil by utilizing stator bracket and electric vehicle

Abstract

The utility model relates to the technical field of hub motors, and particularly discloses a liquid-cooled hub motor capable of preventing oil by using a stator bracket and an electric vehicle. The stator and the hub are arranged on the supporting shaft, a cavity is formed in the hub, the stator is located in the cavity, and cooling liquid is further arranged in the cavity; the stator comprises a stator support fixed on the supporting shaft and a stator iron core arranged on the periphery of the stator support, a stator inner cavity communicated with the cavity is formed in the stator support, the ventilation channel is communicated with the cavity and the outside, one end of the ventilation channel is located in the stator inner cavity, and the other end of the ventilation channel is located outside the cavity and connected with a ventilation device. According to the utility model, cooling liquid is not easy to flow into or splash into the stator inner cavity by utilizing the stator inner cavity of the existing stator bracket with the hollow structure, so that the ventilation device connected with the ventilation channel is better prevented from being polluted and blocked by the cooling liquid, and the service life of the motor is prolonged.

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 and an electric vehicle utilizing a stator bracket to prevent oil. Background Art

[0002] The hub motor is a drive method that integrates the motor directly into the wheel hub. It is widely used in electric vehicles, electric bicycles, electric motorcycles, and some special vehicles and equipment. Since the hub motor generates a certain amount of heat during operation, the heat generated inside will cause the gas to expand, forming an internal and external pressure difference. In order to prevent the wheel hub from being damaged due to excessive internal pressure, a breathable device such as a breathable valve is generally installed. The breathable valve not only balances the internal and external air pressure, but also the mechanism in the breathable valve is based on the pore structure of special materials. When the hub motor is wading outside, the water will be blocked and fill the pores to form a sealing layer, thereby preventing external moisture from corroding and damaging the internal parts of the motor.

[0003] Existing hub motors are generally cooled by air cooling, but the heat dissipation effect of air convection is poor. In order to improve the heat exchange efficiency, liquid-cooled hub motors use circulating cooling media (such as insulating cooling oil) to transfer the heat generated by the stator and rotor to the casing. However, once the cooling oil of the liquid-cooled hub motor enters the breathable valve, the oil may block the pore structure and affect its breathability. Therefore, existing liquid-cooled hub motors are generally equipped with a gas-liquid separation device to prevent the cooling oil from entering the breathable device.

[0004] For example, patent CN108880109B discloses an oil-cooled motor, which isolates the cooling insulating liquid in the casing by setting up a gas-liquid separation device, and allows the separated gas to be discharged from the vent pipe to the outside of the casing, which is conducive to discharging the hot gas in the casing and improving the heat dissipation effect. In addition, CN215120356U discloses a hub motor with a drying and ventilating device, which is provided with an oil-gas separator and a drying and ventilating device. When oil and gas enter the oil-gas separator, the oil is blocked by the oil-gas separator and is discharged from one end of the shaft hole after being dried by the drying and ventilating device, ultimately achieving the effect of balancing the internal air pressure of the hub motor with the external air pressure.

[0005] However, installing a gas-liquid separation device not only increases the manufacturing and maintenance costs of the hub motor, but also, since it is impossible to avoid oil droplets splashing onto the inlet of the device, oil stains are likely to accumulate over a long period of time, causing blockage or damage, which is not conducive to the operational reliability of the hub motor. Therefore, the ventilation and oil-proof effect of the hub motor needs to be improved. Utility Model Content

[0006] The utility model aims to overcome the deficiencies of the prior art and provide a liquid-cooled hub motor and an electric vehicle utilizing a stator bracket to prevent oil.

[0007] On the one hand, the utility model discloses a liquid-cooled hub motor using a stator bracket to prevent oil, which adopts the following technical solutions:

[0008] A liquid-cooled hub motor utilizing a stator support for oil protection comprises a support shaft, a stator and a hub arranged on the support shaft, a chamber is formed in the hub, the stator is located in the chamber, and a coolant is also provided in the chamber; the stator comprises a stator support fixed on the support shaft and a stator core arranged on the outer periphery of the stator support, a stator inner cavity connected to the chamber is provided in the stator support, and the stator support further comprises an air permeable channel connecting the chamber with the outside, one end of the air permeable channel is located in the stator inner cavity, and the other end of the air permeable channel is located outside the chamber and connected to a ventilation device.

[0009] Preferably, the air permeable channel is an intra-shaft channel located inside the support shaft.

[0010] Preferably, the stator further comprises a stator sleeve arranged between the stator bracket and the supporting shaft, and the stator sleeve is provided with an air guide port, which connects the stator inner cavity with the inner channel of the shaft.

[0011] Preferably, one end opening of the intra-shaft channel is located at the upper end of the support shaft, and the other end opening of the intra-shaft channel is located at the lower end of the support shaft.

[0012] Preferably, the air-permeable channel includes an intra-axial channel arranged inside the support shaft and an extra-axial pipe arranged in the chamber, one end of the extra-axial pipe is located in the stator inner cavity, the other end of the extra-axial pipe is connected to the intra-axial channel, and the other end of the intra-axial channel is located outside the chamber.

[0013] Preferably, the in-shaft channel comprises a first in-shaft channel and a second in-shaft channel that are connected, and the axes of the first in-shaft channel and the second in-shaft channel are not on the same straight line.

[0014] Preferably, the end of the off-axis pipe connected to the inner cavity of the stator is located between the axis and the outer peripheral edge of the stator.

[0015] Preferably, the opening of the end of the off-axis pipe connected to the stator inner cavity faces downward.

[0016] Preferably, an insertion hole communicating with the stator inner cavity is provided on the stator bracket, and the end of the off-axis pipe is arranged in the stator inner cavity by extending into the insertion hole.

[0017] Preferably, a process hole is provided on the stator bracket, the process hole connects the stator inner cavity with the chamber, and the insertion hole is arranged away from the process hole.

[0018] Preferably, a shaft bushing is sleeved on the support shaft, and the air permeable channel includes a shaft sleeve channel arranged in the shaft bushing and an off-shaft pipe arranged in the chamber, one end of the off-shaft pipe is located in the stator inner cavity, the other end of the off-shaft pipe is communicated with the shaft sleeve channel, and the other end of the shaft sleeve channel is located outside the chamber.

[0019] Preferably, the air permeable channel is arranged obliquely downward from the outside of the chamber to the inner cavity of the stator.

[0020] Preferably, the stator bracket comprises a first bracket single piece and a second bracket single piece which are interlocked with each other, and the stator inner cavity is formed between the first bracket single piece and the second bracket single piece.

[0021] Preferably, an oleophobic component is provided inside or at the end of the air permeable channel.

[0022] On the other hand, the utility model also discloses an electric vehicle, which adopts the following technical solution:

[0023] 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 that uses a stator bracket to prevent oil.

[0024] Compared with the prior art, the utility model has at least the following beneficial effects:

[0025] The utility model utilizes the stator inner cavity of the existing hollow structure stator bracket, arranges the breathable device outside the cavity, and arranges the other end of the breathable channel connected with the breathable device in the stator inner cavity. Compared with the existing breathable valve port exposed in the cavity, the coolant of the present solution is not easy to flow into or splash into the stator inner cavity, and the breathable device connected with the breathable channel is better prevented from being contaminated by the coolant and blocked, so that the breathable function and water sealing function of the breathable device are guaranteed to be stable and reliable, thereby improving the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the hub motor of Embodiment 1 of the utility model;

[0027] Figure 2 It is a cross-sectional view of the hub motor of Embodiment 2 of the present utility model;

[0028] Figure 3 This is a cross-sectional view of the hub motor of Example 3 of the utility model.

[0029] Description of Figure Numbers:

[0030] 1. Support shaft; 11. Shaft bushing; 2. Stator; 21. Stator bracket; 211. Stator inner cavity; 212. Insertion hole; 22. Stator core; 23. Stator bushing; 231. Air guide port; 3. Wheel hub; 4. Chamber; 5. Coolant; 6. Inner shaft channel; 61. First inner shaft channel; 62. Second inner shaft channel; 7. Outer shaft pipeline; 8. Bushing channel; 9. Breathing device. DETAILED DESCRIPTION

[0031] 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.

[0032] Example 1

[0033] This embodiment discloses a liquid-cooled hub motor using a stator bracket to prevent oil. Figure 1 As shown, it includes a support shaft 1, a stator 2 and a hub 3 arranged on the support shaft 1. Among them, the hub 3 includes a rim and end covers 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 provided in the chamber 4; 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 sheet and a second bracket monolithic sheet that are interlocked, and a stator inner cavity 211 is formed between the first bracket monolithic sheet and the second bracket monolithic sheet, and 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. In addition, it also includes a venting channel connecting the chamber 4 with the outside, one end of the venting channel is located in the stator inner cavity 211, and the other end of the venting channel is located outside the chamber 4 and connected to a venting device 9.

[0034] By arranging the breathable device 9 outside the chamber 4 and utilizing the stator inner cavity 211 of the existing hollow structure stator bracket 21, the breathable channel port originally exposed in the chamber 4 is transferred to the stator inner cavity 211. In this way, the coolant 5 in the chamber 4 is not easy to flow into or splash into the stator inner cavity 211, and the breathable device 9 connected to the breathable channel is better prevented from contacting the oil, thereby ensuring the stability and reliability of the breathable function and water sealing function of the breathable device 9, thereby improving the service life of the motor.

[0035] In this embodiment, see Figure 1, the air-permeable channel is the intra-axial channel 6 located inside the support shaft 1. The stator 2 also includes a stator sleeve 23 disposed between the stator bracket 21 and the support shaft 1, and an air guide port 231 is disposed on the stator sleeve 23, and the air guide port 231 connects the stator inner cavity 211 with the intra-axial channel 6. The air guide port 231 may be one or more, or the projection of the air guide port 231 is a waist-shaped hole, which plays a role in avoiding the connection failure caused by the installation error, thereby improving the reliability and stability of the product. As a preferred embodiment, one end opening of the intra-axial channel 6 is located at the upper end of the support shaft 1, and the other end opening of the intra-axial channel 6 is located at the lower end of the support shaft 1. The air guide port 231 is correspondingly opened at the lower end of the stator sleeve 23. By locating the two end openings of the intra-axial channel 6 at the upper and lower sides of the support shaft 1, respectively, it is avoided that the coolant 5 enters through the opening and accumulates in the intra-axial channel 6, thereby improving the reliability of the product. As a preferred solution, the shaft channel 6 includes a first shaft channel 61 and a second shaft channel 62 that are connected to each other. The second shaft channel 62 is tilted and arranged in the support shaft 1. The axes of the first shaft channel 61 and the second shaft channel 62 are not in the same straight line. The shaft channel 6 adopts a two-stage structure, which is more convenient to process and reduces the difficulty of drilling. In order to further reduce the risk of the coolant 5 entering the air permeable channel and contaminating the air permeable device 9, an air permeable and oleophobic component, such as an oleophobic air permeable membrane, is encapsulated in the air permeable channel or at its end.

[0036] The ventilation channel of this embodiment is completely arranged on the supporting shaft 1, which has a simple structure, reduces the number of sealing steps, has high reliability and good ventilation effect.

[0037] Example 2

[0038] The difference between this embodiment and embodiment 1 is that, referring to Figure 2 The air permeable channel includes an intra-axial channel 6 arranged inside the support shaft 1 and an extra-axial pipe 7 arranged in the chamber 4, one end of the extra-axial pipe 7 is located in the stator inner cavity 211, and the other end of the extra-axial pipe 7 is connected to the intra-axial channel 6, and the other end of the intra-axial channel 6 is located outside the chamber 4.

[0039] The stator bracket 21 is provided with an insertion hole 212 connected to the stator inner cavity 211. The end of the off-axis pipe 7 is arranged in the stator inner cavity 211 by extending into the insertion hole 212. The insertion 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 off-axis pipe 7 can also enter the stator inner cavity 211 through one of the process holes away from other holes. As an optional solution, the off-axis pipe 7 can be connected to the upper part of the stator bracket 21, or it can be connected to the lower part of the stator bracket 21. Figure 1As shown, the outer pipe 7 is connected to the upper part of the stator bracket 21, so that the mouth of the outer pipe 7 can be kept away from the coolant 5 at the bottom; of course, the outer pipe 7 can also be connected to the lower part of the stator bracket 21, and the other end opening of the inner channel 6 is correspondingly arranged above the support seat (not shown in the figure), so that the air permeable channel is arranged downwardly from the outside of the chamber 4 to the stator inner cavity 211. In this way, even if part of the coolant 5 enters the air permeable channel, due to the inclination of the air permeable channel, the coolant 5 slides out under the action of gravity, further reducing the possibility of the coolant 5 contaminating the air permeable device 9. In addition, as a preferred solution, the end of the outer pipe 7 connected to the stator inner cavity 211 is located between the stator axis and the outer peripheral edge, which can maximally avoid the coolant 5 in the chamber 4 from contacting the mouth of the outer pipe 7, thereby ensuring the reliability of the product. The end opening of the outer pipe 7 located in the stator inner cavity 211 is arranged downward, which can also better prevent the coolant 5 from splashing into the inner channel 6.

[0040] The air permeable channel of this embodiment adopts the method of connecting the inner-shaft channel 6 with the outer-shaft pipe 7, which reduces the length of the inner-shaft channel 6, reduces the drilling process of the inner-shaft channel 6, and improves production efficiency.

[0041] Example 3

[0042] The difference between this embodiment and embodiment 1 is that, referring to Figure 3 A shaft sleeve 11 is sleeved on the support shaft 1, and the air permeable channel includes a shaft sleeve channel 8 arranged in the shaft sleeve 11 and an outer shaft pipe 7 arranged in the chamber 4, one end of the outer shaft pipe 7 is located in the stator inner cavity 211, and the other end of the outer shaft pipe 7 is connected to the shaft sleeve channel 8, and the other end of the shaft sleeve channel 8 is located outside the chamber 4.

[0043] As a preferred solution, the sleeve channel 8 is located below the support shaft 1 and is arranged to be inclined downward from outside the chamber 4 to inside the chamber 4. The external shaft pipe 7 is connected to the lower part of the stator bracket 21, so that the air permeable channel is arranged to be inclined downward from outside the chamber 4 to the stator inner cavity 211, so that after the coolant 5 splashes into the opening of the external shaft pipe 7, it can be discharged downward under the action of gravity, further reducing the possibility of the coolant 5 contaminating the breathable device 9.

[0044] Compared with setting the inner shaft channel 6 in the support shaft 1, this embodiment can also achieve the effect of conducting the air path by sleeved the shaft bushing 11 with the shaft sleeve channel 8 on the support shaft 1, and there is no need to drill holes in the support shaft 1, thereby ensuring the structural strength of the support shaft 1.

[0045] Example 4

[0046] 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. The hub motor can be any of the above embodiments of a liquid-cooled hub motor that uses a stator bracket to prevent oil. This electric vehicle adopts the above liquid-cooled hub motor, has good operating stability, low maintenance cost, better heat dissipation performance, and higher reliability.

[0047] 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 using a stator bracket to prevent oil, comprising a support shaft, a stator and a hub arranged on the support shaft, a chamber is formed in the hub, the stator is located in the chamber, and a coolant is also arranged in the chamber; the stator comprises a stator bracket fixed on the support shaft and a stator core arranged on the outer periphery of the stator bracket, the stator bracket is provided with a stator inner cavity connected to the chamber, characterized in that: It also includes a ventilation channel connecting the chamber with the outside, one end of the ventilation channel is located in the stator inner cavity, and the other end of the ventilation channel is located outside the chamber and connected to a ventilation device.

2. The liquid-cooled hub motor with oil-proof stator bracket according to claim 1, characterized in that: The air-permeable channel is an intra-shaft channel located inside the supporting shaft.

3. The liquid-cooled hub motor with oil-proof stator bracket according to claim 2, characterized in that: The stator also includes a stator sleeve arranged between the stator bracket and the supporting shaft. The stator sleeve is provided with an air guide port, which communicates the stator inner cavity with the shaft inner channel.

4. The liquid-cooled hub motor with oil-proof stator bracket according to claim 2, characterized in that: One end opening of the inner shaft channel is located at the upper end of the support shaft, and the other end opening of the inner shaft channel is located at the lower end of the support shaft.

5. The liquid-cooled hub motor with oil-proof stator bracket according to claim 1, characterized in that: The air-permeable channel includes an intra-axial channel arranged inside the support shaft and an extra-axial pipe arranged in the chamber, one end of the extra-axial pipe is located in the stator inner cavity, the other end of the extra-axial pipe is connected to the intra-axial channel, and the other end of the intra-axial channel is located outside the chamber.

6. The liquid-cooled hub motor with oil-proof stator bracket according to claim 2 or 5, characterized in that: The in-shaft channel comprises a first in-shaft channel and a second in-shaft channel that are connected to each other, and the axes of the first in-shaft channel and the second in-shaft channel are not on the same straight line.

7. The liquid-cooled hub motor with oil-proof stator bracket according to claim 5, characterized in that: The end portion of the off-axis pipe connected to the inner cavity of the stator is located between the axis of the stator and the outer peripheral edge.

8. The liquid-cooled hub motor with oil-proof stator bracket according to claim 5, characterized in that: The end of the off-axis pipe connected to the stator inner cavity has its opening facing downward.

9. The liquid-cooled hub motor with oil-proof stator support according to claim 5, characterized in that: The stator bracket is provided with an insertion hole communicated with the stator inner cavity, and the end of the off-axis pipe is arranged in the stator inner cavity by extending into the insertion hole.

10. The liquid-cooled hub motor with oil-proof stator bracket according to claim 9, characterized in that: The stator bracket is provided with a process hole, the process hole connects the stator inner cavity with the chamber, and the insertion hole is arranged away from the process hole.

11. The liquid-cooled hub motor with oil-proof stator bracket according to claim 1, characterized in that: A shaft sleeve is sleeved on the support shaft, and the air permeable channel includes a shaft sleeve channel arranged in the shaft sleeve and an off-shaft pipe arranged in the chamber, one end of the off-shaft pipe is located in the stator inner cavity, the other end of the off-shaft pipe is communicated with the shaft sleeve channel, and the other end of the shaft sleeve channel is located outside the chamber.

12. The liquid-cooled hub motor with oil-proof stator bracket according to claim 1, characterized in that: The air permeable channel is arranged obliquely downward from the outside of the chamber to the inner cavity of the stator.

13. The liquid-cooled hub motor with oil-proof stator bracket according to claim 1, characterized in that: The stator support comprises a first support single piece and a second support single piece which are interlocked with each other, and the stator inner cavity is formed between the first support single piece and the second support single piece.

14. The liquid-cooled hub motor with oil-proof stator bracket according to claim 1, characterized in that: An oleophobic component is provided inside or at the end of the air permeable channel.

15. 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 utilizing oil-proof stator bracket as described in any one of claims 1 to 14 above.

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