Coaxial electric driving device and vehicle

Abstract

The utility model discloses a coaxial electric driving device and a vehicle. The coaxial electric driving device comprises a shell, a rotor shaft, an output half shaft and a first sealing piece. Wherein the shell is provided with a first cooling liquid channel; the rotor shaft is provided with a hollow cavity and at least one liquid inlet hole formed in the peripheral wall of the rotor shaft, and the liquid inlet hole is communicated with the hollow cavity; the output half shaft is arranged in the hollow cavity in a penetrating mode and is coaxial with the rotor shaft, a gap is formed between the output half shaft and the cavity wall of the hollow cavity, the gap forms a second cooling liquid channel, the second cooling liquid channel is used for containing cooling liquid, and the second cooling liquid channel is communicated with the first cooling liquid channel through the liquid inlet hole; the first sealing piece is arranged at the end of the second cooling liquid channel and used for preventing the cooling liquid from flowing out of the second cooling liquid channel. According to the coaxial electric driving device, the rotor shaft and the rotor can be cooled in the small-size electric driving device, and the path is simple and easy to implement.

Description

Technical Field

[0001] This application relates to the field of electric drive technology, and in particular to a coaxial electric drive device and vehicle. Background Technology

[0002] As the requirements for the range of new energy vehicles become increasingly demanding and the size of batteries increases, the longitudinal volume requirements for electric drive devices in the overall vehicle layout become smaller and smaller. Coaxial electric drive devices are becoming the future development direction of electric drive.

[0003] In related technologies, the output half-shaft of a coaxial electric drive device is coaxially disposed within the rotor shaft of a hollow motor, meaning the rotor shaft has a hollow cavity through which the output half-shaft passes, effectively reducing the size of the electric drive device. However, the output half-shaft occupies most of the space in the hollow cavity, making it somewhat difficult to implement a method of cooling the rotor shaft and rotor by laying coolant pipes within the hollow cavity. Utility Model Content

[0004] This application discloses a coaxial electric drive device and vehicle, which can cool the rotor shaft and rotor in a small electric drive device, and the path is simple and easy to implement.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application disclose a coaxial electric drive device, comprising:

[0006] A housing having a first coolant passage;

[0007] A rotor shaft having a hollow cavity and at least one liquid inlet hole disposed on the outer peripheral wall of the rotor shaft, the liquid inlet hole communicating with the hollow cavity;

[0008] An output half-shaft is inserted into the hollow cavity and coaxially arranged with the rotor shaft. There is a gap between the output half-shaft and the cavity wall of the hollow cavity, and the gap forms a second coolant channel. The second coolant channel is used to contain coolant and is connected to the first coolant channel through the inlet hole.

[0009] A first seal is disposed at the end of the second coolant passage to prevent the coolant from flowing out of the second coolant passage.

[0010] The rotor shaft has a hollow cavity and at least one liquid inlet hole on its outer peripheral wall, which communicates with the hollow cavity. An output half-shaft passes through the hollow cavity and is coaxially arranged with the rotor shaft. A gap exists between the output half-shaft and the cavity wall, forming a second coolant channel. This second coolant channel accommodates coolant and communicates with a first coolant channel through the liquid inlet hole. This allows coolant to flow through the first coolant channel on the housing and then into the second coolant channel through the liquid inlet hole. Firstly, this cools the rotor shaft, thereby cooling the rotor on its outer peripheral wall, preventing demagnetization due to high rotor temperature, and improving the performance of the device. The coaxial electric drive system offers several advantages: firstly, it improves vehicle safety; secondly, it cools and de-temperatures the rotor shaft and rotor without occupying additional space, facilitating miniaturization; thirdly, the coolant flow path is simple and easy to implement; and fourthly, the shorter flow path allows the coolant to flow into the second coolant channel, effectively reducing the temperature rise before entering the channel. This allows the coolant to cool and de-temperature the rotor shaft and rotor at a lower temperature, improving cooling efficiency and further preventing demagnetization due to high rotor temperature, thus enhancing vehicle safety.

[0011] Optionally, the liquid inlet hole is provided on the outer peripheral wall of the rotor shaft near the end of the rotor shaft.

[0012] Optionally, the liquid inlet hole is an elongated slot extending circumferentially around the rotor shaft.

[0013] Optionally, there are multiple liquid inlet holes, which are spaced apart on the outer peripheral wall of the rotor shaft along the circumference of the rotor shaft.

[0014] Optionally, a second seal and a third seal are fitted on the outer peripheral wall of the rotor shaft. Along the axial direction of the rotor shaft, the second seal and the third seal are respectively located on both sides of the liquid inlet hole. Both the second seal and the third seal are used to seal the gap between the housing and the rotor shaft.

[0015] Optionally, the second seal includes at least one of an oil seal, an O-ring, and a bushing, and / or the third seal includes at least one of an oil seal, an O-ring, and a bushing.

[0016] Optionally, the first seal is in sealing contact with one of the rotor shaft and the output half-shaft, and in clearance fit with the other of the rotor shaft and the output half-shaft.

[0017] Optionally, the first seal includes any one of an oil baffle ring, an oil baffle plate, and a sealing ring.

[0018] Optionally, the two ends of the rotor shaft are rotatably mounted on the housing via a first bearing and a second bearing, respectively. The outer peripheral wall of the rotor shaft, located between the first bearing and the second bearing, is provided with a first liquid outlet and a second liquid outlet. Both the first and second liquid outlets are connected to the second coolant channel, with the outlet end of the first liquid outlet facing the first bearing and the outlet end of the second liquid outlet facing the second bearing; and / or,

[0019] A third liquid outlet is provided on the outer peripheral wall of the rotor shaft in the region corresponding to the rotor, and the third liquid outlet is connected to the second coolant channel.

[0020] Secondly, this application discloses a vehicle, including a vehicle body and a coaxial electric drive device as described in any one of the first aspects, wherein the coaxial electric drive device is disposed within the vehicle body.

[0021] Compared with the prior art, the beneficial effects of this application are as follows:

[0022] The rotor shaft has a hollow cavity and at least one liquid inlet hole on its outer peripheral wall, which communicates with the hollow cavity. An output half-shaft passes through the hollow cavity and is coaxially arranged with the rotor shaft. A gap exists between the output half-shaft and the cavity wall, forming a second coolant channel. This second coolant channel accommodates coolant and communicates with a first coolant channel through the liquid inlet hole. This allows coolant to flow through the first coolant channel on the housing and then into the second coolant channel through the liquid inlet hole. Firstly, this cools the rotor shaft, thereby cooling the rotor on its outer peripheral wall, preventing demagnetization due to high rotor temperature, and improving the performance of the device. The coaxial electric drive system offers several advantages: firstly, it improves vehicle safety; secondly, it cools and de-temperatures the rotor shaft and rotor without occupying additional space, facilitating miniaturization; thirdly, the coolant flow path is simple and easy to implement; and fourthly, the shorter flow path allows the coolant to flow into the second coolant channel, effectively reducing the temperature rise before entering the channel. This allows the coolant to cool and de-temperature the rotor shaft and rotor at a lower temperature, improving cooling efficiency and further preventing demagnetization due to high rotor temperature, thus enhancing vehicle safety. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A cross-sectional view of a coaxial electric drive device provided in an embodiment of this application;

[0025] Figure 2 for Figure 1 Enlarged view of position A in the middle;

[0026] Figure 3 A perspective view of a rotor shaft provided in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Housing; 11-First coolant passage; 2-Rotor shaft; 21-Inlet hole; 22-Second coolant passage; 23-First outlet; 24-Third outlet; 3-Output half-shaft; 4-First seal; 5-Second seal; 6-Third seal; 7-First bearing; 8-Second bearing; 9-Rotor;

[0030] 10-Coaxial electric drive unit;

[0031] 100 - Vehicles. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0035] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0036] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0037] In view of the problems described in the background art, the present invention provides a coaxial electric drive device and vehicle that can cool the rotor shaft and rotor in a small electric drive device, and the path is simple and easy to implement.

[0038] The battery will be described in detail below through specific embodiments:

[0039] This application provides a coaxial electric drive device, such as... Figures 1-3 As shown, the device includes a housing 1, a rotor shaft 2, an output half-shaft 3, and a first seal 4. The housing 1 has a first coolant channel 11; the rotor shaft 2 has a hollow cavity and at least one inlet hole 21 disposed on the outer peripheral wall of the rotor shaft 2, the inlet hole 21 communicating with the hollow cavity; the output half-shaft 3 passes through the hollow cavity and is coaxially arranged with the rotor shaft 2, with a gap between the output half-shaft 3 and the cavity wall, forming a second coolant channel 22, which is used to contain coolant and communicates with the first coolant channel 11 through the inlet hole 21; the first seal 4 is disposed at the end of the second coolant channel 22 to prevent coolant from flowing out of the second coolant channel 22.

[0040] The rotor shaft 2 has a hollow cavity and at least one liquid inlet hole 21 disposed on the outer peripheral wall of the rotor shaft 2. The liquid inlet hole 21 communicates with the hollow cavity. The output half-shaft 3 passes through the hollow cavity and is coaxially arranged with the rotor shaft 2. There is a gap between the output half-shaft 3 and the cavity wall of the hollow cavity, and the gap forms a second coolant channel 22. The second coolant channel 22 is used to contain coolant. The second coolant channel 22 communicates with the first coolant channel 11 through the liquid inlet hole 21, so that the coolant can flow into the second coolant channel 22 through the liquid inlet hole 21 after flowing through the first coolant channel 11 on the housing 1. Figure 1 (The arrows shown indicate the flow direction of the coolant.) Firstly, the rotor shaft 2 can be cooled, thereby cooling the rotor 9 mounted on the outer peripheral wall of the rotor shaft 2, preventing demagnetization due to high rotor 9 temperature, and improving the safety of vehicles equipped with the coaxial electric drive device 10. Secondly, while achieving cooling and temperature reduction of the rotor shaft 2 and rotor 9, it does not occupy additional space of the coaxial electric drive device 10, which is conducive to the miniaturization of the coaxial electric drive device 10. Thirdly, the coolant flow path is relatively simple and easy to implement. Fourthly, the coolant can flow into the second coolant channel 22 through a shorter flow path, effectively reducing the temperature rise of the coolant before flowing into the second coolant channel 22, allowing the coolant to cool and reduce the temperature of the rotor shaft 2 and rotor 9 at a lower temperature, effectively improving the cooling effect, further preventing demagnetization due to high rotor 9 temperature, and making the safety of vehicles equipped with the coaxial electric drive device 10 better.

[0041] The first sealing element 4 is provided at the end of the second coolant passage 22 to block the coolant from flowing out of the second coolant passage 22, which can effectively prevent the coolant from flowing out of the second coolant passage 22 from affecting the cooling of the rotor shaft 2 and the rotor 9.

[0042] It should be explained that the first seal 4 used to block coolant from flowing out of the second coolant passage 22 means that the first seal 4 can be used to block most of the coolant in the second coolant passage 22 from flowing out of the second coolant passage 22, or to block all of the coolant in the second coolant passage 22 from flowing out of the second coolant passage 22.

[0043] The coolant can be either cooling oil or cooling water; there is no limitation on this.

[0044] The housing 1 can be any of the following: the housing of the motor, the housing of the transmission device, or the housing of other components in the coaxial electric drive device 10; there is no limitation thereof. Preferably, the housing 1 can be the housing of the motor.

[0045] Optionally, such as Figure 2 and Figure 3 As shown, the liquid inlet 21 is provided on the outer peripheral wall of the rotor shaft 2 near the end of the rotor shaft 2.

[0046] This allows the coolant to flow from one end of the second coolant channel 22 to the other end, enabling the coolant to cool the rotor shaft 2 and rotor 9 more effectively. Furthermore, the design of the inlet hole 21 does not need to consider the impact on other components such as rotor 9, making the design of the inlet hole 21 simple and easy to implement.

[0047] Optionally, the liquid inlet hole 21 is an elongated slot extending circumferentially around the rotor shaft 2.

[0048] Therefore, during the rotation of the rotor shaft 2, the first coolant channel 11 can be connected to the second coolant channel 22 through the inlet hole 21 for a longer period of time, allowing more coolant to flow into the second coolant channel 22, thus improving the cooling effect on the rotor shaft 2 and the rotor 9.

[0049] Of course, in other embodiments, the liquid inlet hole 21 can also be a circular hole, an elliptical hole, etc., and is not limited here.

[0050] Optionally, there may be multiple liquid inlet holes 21, which are spaced apart on the outer peripheral wall of the rotor shaft 2 along the circumference of the rotor shaft 2.

[0051] Therefore, during the rotation of the rotor shaft 2, the first coolant channel 11 can be connected to the second coolant channel 22 through the inlet hole 21 for a longer period of time, allowing more coolant to flow into the second coolant channel 22, thus achieving a better cooling effect on the rotor shaft 2 and the rotor 9.

[0052] The number of liquid inlet holes 21 can be two, three or more, and is not limited here.

[0053] In addition, multiple liquid inlet holes 21 can be evenly arranged on the outer peripheral wall of the rotor shaft 2 along the circumference of the rotor shaft 2, so that after the rotor shaft 2 rotates at a certain angle, the first coolant channel 11 can be connected to the second coolant channel 22 through another liquid inlet hole 21.

[0054] For example, when there are two inlet holes 21, the two inlet holes 21 can be located on both sides of the rotor shaft 2 along the radial direction of the rotor shaft 2, so that after the rotor shaft 2 rotates half a turn, the first coolant channel 11 can be connected to the second coolant channel 22 through the other inlet hole 21, so that the coolant can still flow into the second coolant channel 22.

[0055] In some embodiments, such as Figure 2As shown, a second sealing element 5 and a third sealing element 6 are sleeved on the outer peripheral wall of the rotor shaft 2. Along the axial direction of the rotor shaft 2, the second sealing element 5 and the third sealing element 6 are located on both sides of the liquid inlet hole 21. The second sealing element 5 and the third sealing element 6 are used to seal the gap between the housing 1 and the rotor shaft 2.

[0056] This effectively prevents coolant from flowing out of the gap between the housing 1 and the rotor shaft 2, allowing the coolant flowing out of the first coolant channel 11 to flow into the second coolant channel 22, thus improving the cooling effect of the coolant.

[0057] Furthermore, the second seal 5, the third seal 6, the housing 1, and the rotor shaft 2 can be arranged to form a relatively enclosed space, so that when the first coolant channel 11 is not connected to the second coolant channel 22 during the rotation of the rotor shaft 2, some coolant can be temporarily stored in the relatively enclosed space.

[0058] The second seal 5 can be at least one of an oil seal, an O-ring, or a bushing, thereby enabling the second seal 5 to have good sealing performance and be easy to implement, thus reducing costs.

[0059] The third seal 6 may also include at least one of an oil seal, an O-ring, or a bushing, so that the second seal 5 can have good sealing performance and is easy to implement, further reducing costs.

[0060] In addition, the structure of the third seal 6 can be roughly the same as that of the second seal 5. That is, the second seal 5 and the third seal 6 can be interchanged, so that when installing the second seal 5 and the third seal 6, there is no need to distinguish between the two, which facilitates the installation of the second seal 5 and the third seal 6.

[0061] A groove can be provided on the outer peripheral wall of the rotor shaft 2 at the position corresponding to the second seal 5 and the third seal 6. The second seal 5 and the third seal 6 can be respectively locked in the groove to prevent the second seal 5 and the third seal 6 from moving axially along the rotor shaft 2. This avoids poor sealing between the housing 1 and the rotor shaft 2 due to the axial movement of the second seal 5 and the third seal 6, and effectively improves the sealing performance of the second seal 5 and the third seal 6.

[0062] In some embodiments, the first seal 4 is sealed to one of the rotor shaft 2 and the output half-shaft 3, and clearance-fitted to the other of the rotor shaft 2 and the output half-shaft 3.

[0063] Therefore, the probability of frictional resistance between the first seal 4 and the rotor shaft 2 and the output half shaft 3 can be effectively reduced, thereby reducing the energy loss of the rotor shaft 2 and the output half shaft 3.

[0064] When the first seal 4 is in sealing contact with the rotor shaft 2 or the output half shaft 3, the first seal 4 is fixedly connected to the rotor shaft 2 or the output half shaft 3. That is, during the rotation of the rotor shaft 2 and the output half shaft 3, the first seal 4 can rotate with the rotor shaft 2 without contacting the output half shaft 3, or it can rotate with the output half shaft 3 without contacting the rotor shaft 2. This avoids frictional resistance between the first seal 4 and the rotor shaft 2 and the output half shaft 3, and further reduces the energy loss of the rotor shaft 2 and the output half shaft 3.

[0065] For example, when the motor in the coaxial electric drive device 10 is arranged horizontally, if the first seal 4 is sealed relative to the rotor shaft 2 and has a clearance fit with the output half shaft 3, during the rotation of the rotor shaft 2, due to centrifugal force, the coolant in the second coolant channel 22 will adhere to the cavity wall of the hollow cavity until the coolant level exceeds the first seal 4, at which point the coolant will flow out from the gap between the first seal 4 and the output half shaft 3. When the rotor shaft 2 is not rotating, i.e. when the motor is stationary, due to gravity, the coolant in the second coolant channel 22 will flow to the position below the first coolant channel 11, and the coolant will also adhere to the cavity wall of the hollow cavity until the coolant level exceeds the first seal 4, at which point the coolant will flow out from the gap between the first seal 4 and the output half shaft 3.

[0066] In addition, the gap between the first seal 4 and the rotor shaft 2 or the output half shaft 3 can be 0.3mm, 0.4mm, 0.6mm, etc., and is not limited here. Specifically, the gap between the first seal 4 and the rotor shaft 2 or the output half shaft 3 can be adjusted as needed, so as to prevent most of the coolant from flowing out of the second coolant channel 22, while also avoiding frictional resistance between the first seal 4 and the rotor shaft 2 and the output half shaft 3.

[0067] Optionally, the first seal 4 may include any one of an oil baffle ring, an oil baffle plate, and a sealing ring. Thus, the first seal 4 can be manufactured separately, and its dimensions can be adjusted according to the required clearance between the first seal 4 and the rotor shaft 2 or the output half-shaft 3, making the first seal 4 easy to manufacture.

[0068] Of course, in other embodiments, the first sealing element 4 may also be a convex ring disposed on the cavity wall of the hollow cavity, or a flange disposed on the output half shaft 3, and there is no limitation here.

[0069] In other embodiments, such as Figures 1-3As shown, the two ends of the rotor shaft 2 are rotatably mounted on the housing 1 via the first bearing 7 and the second bearing 8, respectively. The portion of the outer peripheral wall of the rotor shaft 2 located between the first bearing 7 and the second bearing 8 is provided with a first liquid outlet 23 and a second liquid outlet (not shown in the figure). Both the first liquid outlet 23 and the second liquid outlet are connected to the second coolant channel 22, and the outlet end of the first liquid outlet 23 faces the first bearing 7, while the outlet end of the second liquid outlet faces the second bearing 8. And / or, a third liquid outlet 24 is provided on the outer peripheral wall of the rotor shaft 2 in the area corresponding to the rotor 9, and the third liquid outlet 24 is connected to the second coolant channel 22.

[0070] Therefore, the coolant can also flow to the first bearing 7 through the first outlet 23 to cool and lower the temperature of the first bearing 7, flow to the second bearing 8 through the second outlet to cool and lower the temperature of the second bearing 8, and flow to the rotor 9 through the third outlet 24 to further cool the rotor 9, so that the first bearing 7, the second bearing 8 and the rotor 9 are not likely to have excessive temperature affecting the operation of the motor during operation.

[0071] The first outlet 23 can be inclinedly disposed on the rotor shaft 2, and the outlet end of the first outlet 23 can face the area between the inner and outer rings of the first bearing 7, so that the coolant can flow to the area between the inner and outer rings of the first bearing 7 after passing through the first outlet 23, so that both the inner and outer rings of the first bearing 7 can be cooled and cooled down relatively fully.

[0072] Similarly, the second outlet can also be inclinedly arranged on the rotor shaft 2, and the outlet end of the second outlet faces the area between the inner and outer rings of the second bearing 8.

[0073] In addition, there can be multiple first liquid outlets 23, which are spaced apart along the circumference of the rotor shaft 2 so that the coolant can flow to the first bearing 7 simultaneously through multiple first liquid outlets 23, thereby improving the cooling effect on the first bearing 7.

[0074] The number of second liquid outlets can also be multiple, with multiple second liquid outlets spaced apart along the circumference of the rotor shaft 2, so that the coolant can flow to the second bearing 8 simultaneously through multiple second liquid outlets, thereby improving the cooling effect on the second bearing 8.

[0075] The number of third outlets 24 can also be multiple. Multiple third outlets 24 are arranged at intervals along the circumference of the rotor shaft 2 so that the coolant can flow to the rotor 9 simultaneously through multiple third outlets 24, thereby improving the cooling effect on the rotor 9.

[0076] This application also provides a vehicle, such as Figure 4As shown, the vehicle includes a vehicle body and a coaxial electric drive device 10 of any of the above embodiments, wherein the coaxial electric drive device 10 is disposed within the vehicle body.

[0077] By placing the coaxial electric drive device 10 within the vehicle body, the space occupied by the coaxial electric drive device 10 within the vehicle body can be effectively reduced, providing more possibilities for installing other structural components within the vehicle body. Furthermore, since the coaxial electric drive device 10 is the same as the coaxial electric drive device 10 in the above embodiments, during operation, the rotor shaft 2 and rotor 9 in the motor of the coaxial electric drive device 10 can not only be effectively cooled, avoiding demagnetization due to high rotor 9 temperature, thus improving the safety of the vehicle 100 equipped with the coaxial electric drive device 10, but also the coolant flow path on the coaxial electric drive device 10 is simpler and easier to implement, reducing costs.

[0078] Furthermore, the coaxial electric drive device 10 in the vehicle 100 is any of the coaxial electric drive devices 10 in the above embodiments. Therefore, the vehicle 100 can produce the same or similar beneficial effects as the coaxial electric drive device 10 in any of the above embodiments, which will not be described in detail here.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coaxial electrical drive arrangement, characterized by include: A housing having a first coolant passage; A rotor shaft having a hollow cavity and at least one liquid inlet hole disposed on the outer peripheral wall of the rotor shaft, the liquid inlet hole communicating with the hollow cavity; An output half-shaft is inserted into the hollow cavity and coaxially arranged with the rotor shaft. There is a gap between the output half-shaft and the cavity wall of the hollow cavity, and the gap forms a second coolant channel. The second coolant channel is used to contain coolant and is connected to the first coolant channel through the inlet hole. A first seal is disposed at the end of the second coolant passage to prevent the coolant from flowing out of the second coolant passage.

2. The coaxial electro-kinetic drive of claim 1, wherein, The liquid inlet hole is provided on the outer peripheral wall of the rotor shaft near the end of the rotor shaft.

3. The coaxial electro-kinetic drive of claim 1, wherein, The liquid inlet hole is a long slot extending circumferentially around the rotor shaft.

4. The coaxial electro-kinetic drive of claim 1, wherein, The number of liquid inlet holes is multiple, and the multiple liquid inlet holes are spaced apart on the outer peripheral wall of the rotor shaft along the circumference of the rotor shaft.

5. The coaxial electro-kinetic drive of claim 1, wherein, A second seal and a third seal are fitted on the outer peripheral wall of the rotor shaft. Along the axial direction of the rotor shaft, the second seal and the third seal are located on both sides of the liquid inlet hole. Both the second seal and the third seal are used to seal the gap between the housing and the rotor shaft.

6. The coaxial electro-kinetic drive device of claim 5, wherein, The second seal includes at least one of an oil seal, an O-ring, and a bushing, and / or the third seal includes at least one of an oil seal, an O-ring, and a bushing.

7. The coaxial electrokinetic drive device according to any one of claims 1 to 6, wherein The first seal is in sealing contact with one of the rotor shaft and the output half-shaft, and in clearance fit with the other of the rotor shaft and the output half-shaft.

8. The coaxial electro-kinetic drive device according to any one of claims 1 to 6, wherein The first sealing element includes any one of an oil baffle ring, an oil baffle plate, and a sealing ring.

9. The coaxial electro-kinetic drive device according to any one of claims 1-6, wherein, The rotor shaft is rotatably mounted on the housing at both ends via a first bearing and a second bearing, respectively. A first liquid outlet and a second liquid outlet are provided on the outer peripheral wall of the rotor shaft between the first bearing and the second bearing. Both the first and second liquid outlets are connected to the second coolant channel, with the outlet end of the first liquid outlet facing the first bearing and the outlet end of the second liquid outlet facing the second bearing; and / or, A third liquid outlet is provided on the outer peripheral wall of the rotor shaft in the region corresponding to the rotor, and the third liquid outlet is connected to the second coolant channel.

10. A vehicle characterized by comprising: It includes a vehicle body and a coaxial electric drive device as described in any one of claims 1-9, wherein the coaxial electric drive device is disposed within the vehicle body.

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