Planetary coaxial power assembly and electric vehicle

Abstract

The invention provides a planet coaxial type power assembly and an electric vehicle, and relates to the technical field of electric vehicles, the two sides of a middle partition plate of a shell of the planet coaxial type power assembly are used for enclosing a motor shell and a speed reducer shell to form a motor cavity and a speed reducer cavity respectively, and the motor cavity is used for containing a stator and a rotor of a driving motor; the reducer cavity is used for containing the planetary reducer and the differential. The first oil outlet holes of the motor shell are distributed in the inner wall, facing the middle partition plate, of the motor shell. The first oil outlet holes receive oil output by the heat exchanger through a first internal flow channel of the motor shell and output the oil to cool one side of a rotor of the driving motor. Second oil outlet holes of the middle partition plate are distributed in the side, facing the motor shell, of the middle partition plate, receive oil liquid output by the heat exchanger through a second internal flow channel of the motor shell and output the oil liquid to cool the other side of the rotor of the driving motor, and therefore the shell oil way can be directly used for directionally feeding oil to the rotor. And the cooling effect of the driving motor is improved.

Description

Technical Field

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

[0002] The powertrain is the primary power source for electric vehicles. A planetary coaxial powertrain consists of a drive motor and a planetary reducer. The drive motor provides high-speed kinetic energy, while the planetary reducer converts this energy into greater torque output. To ensure proper operation of the drive motor and planetary reducer, oil is typically introduced for cooling and lubrication. However, due to the compact structure of the drive motor and planetary reducer in a planetary coaxial powertrain, introducing oil into the powertrain is difficult. This makes targeted active cooling and lubrication of the drive motor and planetary reducer challenging, resulting in insufficient cooling and lubrication efficiency and hindering the normal operation of the powertrain. Summary of the Invention

[0003] This application provides a planetary coaxial powertrain and an electric vehicle, which can directly achieve active cooling and lubrication of the rotor of the drive motor through the oil circuit of the housing of the planetary coaxial powertrain, thereby improving the cooling and lubrication effect of the planetary coaxial powertrain.

[0004] In a first aspect, this application provides a planetary coaxial powertrain. The planetary coaxial powertrain housing includes a motor housing, a partition plate, and a reducer housing. The two sides of the partition plate respectively enclose the motor housing and the reducer housing to form a motor cavity and a reducer cavity. The motor cavity houses the stator and rotor of the drive motor, and the reducer cavity houses the planetary reducer and the differential. The drive motor drives the planetary reducer to drive the differential. The differential drives the wheels of the electric vehicle via a drive shaft, which passes through the shaft cavity of the drive motor's shaft to drive the differential. The motor housing includes a first oil outlet, distributed on the inner wall of the motor housing facing the partition plate. The first oil outlet receives oil output from the heat exchanger of the planetary coaxial powertrain through a first internal flow channel of the motor housing. The oil output from the first oil outlet cools one side of the rotor of the drive motor. The partition plate includes a second oil outlet, which is located on the side of the partition plate facing the motor housing. The second oil outlet is used to receive oil output from the heat exchanger of the planetary coaxial powertrain through the second internal flow channel of the motor housing. The oil output from the second oil outlet is used to cool the other side of the rotor of the drive motor.

[0005] In this embodiment, the first internal flow channel of the motor housing receives the oil output from the heat exchanger and delivers it to the first oil outlet to cool one side of the rotor of the drive motor. The second internal flow channel of the motor housing receives the oil output from the heat exchanger and delivers it to the second oil outlet of the partition plate to cool the other side of the rotor of the drive motor. This allows for directional oil delivery to the rotor of the drive motor directly through the oil circuit of the planetary coaxial powertrain housing, enabling direct and effective cooling of the rotor. This results in better cooling of the rotor and improves the overall cooling effect of the drive motor, thereby enhancing the cooling performance of the planetary coaxial powertrain.

[0006] In this embodiment, the oil circuit of the planetary coaxial powertrain housing directly cools the rotor of the drive motor. Compared to cooling the rotor by supplying oil through the shaft cavity of the motor shaft and then through the oil holes of the motor shaft, this solution directly supplies oil to the rotor through the housing's oil circuit, reducing the manufacturing cost of the oil circuit. Furthermore, compared to supplying oil to the rotor through the shaft cavity of the motor shaft, it also reduces drag losses.

[0007] In one embodiment, the distance between the first oil outlet hole along the radial direction of the drive motor and the axis of the drive motor is greater than half the inner diameter of the end ring on one side of the rotor, and the distance between the first oil outlet hole along the radial direction of the drive motor and the axis of the drive motor is less than half the outer diameter of the end ring on one side of the rotor.

[0008] In this embodiment, the oil output from the first oil outlet can be delivered to the end ring on one side of the rotor, thereby cooling one side of the rotor. When the rotor rotates, the oil delivered to the end ring can be thrown to the end windings of the stator, thereby cooling the stator, improving the oil utilization efficiency, enhancing the cooling effect of the drive motor, and ultimately improving the cooling effect of the planetary coaxial powertrain.

[0009] In one embodiment, the distance between the second oil outlet hole along the radial direction of the drive motor and the axis of the drive motor is greater than half the inner diameter of the end ring on the other side of the rotor, and the distance between the second oil outlet hole along the radial direction of the drive motor and the axis of the drive motor is less than half the outer diameter of the end ring on the other side of the rotor.

[0010] In this embodiment, the oil output from the second oil outlet can be delivered to the end ring on the other side of the rotor, thereby cooling the other side of the rotor. When the rotor rotates, the oil delivered to the end ring can be thrown to the end windings of the stator, thereby cooling the stator, improving the oil utilization efficiency, enhancing the cooling effect of the drive motor, and ultimately improving the cooling effect of the planetary coaxial powertrain.

[0011] In one embodiment, the extension direction of the first internal flow channel of the motor housing is parallel to the radial direction of the drive motor, the extension direction of the second internal flow channel of the motor housing is parallel to the axial direction of the drive motor, the extension direction of the first oil outlet is parallel to the axial direction of the drive motor, the extension direction of the second oil outlet is parallel to the axial direction of the drive motor, the flow direction of the oil in the first oil outlet is opposite to the flow direction of the oil in the second oil outlet, and the flow direction of the oil in the first oil outlet is the same as the flow direction of the oil in the second internal flow channel of the motor housing.

[0012] In this embodiment, the first oil outlet is distributed on the inner wall of the motor housing facing the partition plate. The extension direction of the first internal flow channel of the motor housing is parallel to the radial direction of the drive motor, which makes the length of the first internal flow channel of the motor housing shorter. This allows the first internal flow channel of the motor housing to deliver the oil output from the heat exchanger to the first oil outlet more quickly, thereby improving the efficiency of the oil output from the first oil outlet to cool one side of the rotor of the drive motor.

[0013] In this embodiment, the extension direction of the second internal flow channel of the motor housing is parallel to the axial direction of the drive motor, which makes the length of the second internal flow channel of the motor housing shorter. This allows the second internal flow channel of the motor housing to deliver the oil output from the heat exchanger to the second oil outlet more quickly, thereby improving the efficiency of the oil output from the second oil outlet to cool the other side of the rotor of the drive motor.

[0014] In this embodiment, the first oil outlet extends parallel to the axial direction of the drive motor. This facilitates the delivery of oil from the first oil outlet to a position further away from its opening along the axial direction of the drive motor, thus enabling the first oil outlet to deliver oil to one side of the rotor of the drive motor. Similarly, the second oil outlet extends parallel to the axial direction of the drive motor. This facilitates the delivery of oil from the second oil outlet to a position further away from its opening along the axial direction of the drive motor, thus enabling the second oil outlet to deliver oil to the other side of the rotor of the drive motor.

[0015] In this embodiment, the flow direction of the oil in the first oil outlet is opposite to that in the second oil outlet, so that the oil output from the first oil outlet can be delivered to one side of the rotor of the drive motor, while the oil output from the second oil outlet can be delivered to the other side of the rotor of the drive motor, thereby achieving cooling on both sides of the rotor and making the oil cooling the rotor more uniform and effective.

[0016] In one embodiment, the motor housing includes a heat exchanger oil inlet for receiving oil output from the heat exchanger. The extension direction of the heat exchanger oil inlet is parallel to the extension direction of the first internal flow channel and perpendicular to the extension direction of the second internal flow channel.

[0017] In this embodiment, the motor housing includes a heat exchanger oil inlet, which is used to receive oil output from the heat exchanger. This allows the first and second internal flow channels of the motor housing to receive oil output from the heat exchanger through the heat exchanger oil inlet, thereby enabling the oil to be supplied to the rotor of the drive motor for cooling through the housing oil circuit of the planetary coaxial powertrain.

[0018] In this embodiment, the extension direction of the heat exchanger oil inlet is parallel to the radial direction of the drive motor, so that the oil output from the heat exchanger received by the heat exchanger oil inlet can be more smoothly input into the first oil outlet distributed on the inner wall of the motor housing facing the middle partition along the radial direction of the drive motor, which facilitates the faster output of oil from the first oil outlet to cool one side of the rotor of the drive motor.

[0019] In this embodiment, since the second internal flow channel needs to transport oil to the second oil outlet of the partition plate, the extension direction of the heat exchanger oil inlet is perpendicular to the extension direction of the second internal flow channel. This makes it easier to make the length of the heat exchanger oil inlet and the length of the second internal flow channel shorter, which is beneficial for the oil input from the heat exchanger oil inlet to reach the second oil outlet of the partition plate more quickly, so as to cool the other side of the rotor of the drive motor and improve the cooling efficiency of the drive motor.

[0020] In one embodiment, the motor housing includes a first bearing groove distributed on the inner wall of the motor housing facing the partition plate. The partition plate includes a second bearing groove distributed on the side of the partition plate facing the motor housing. The first bearing groove and the second bearing groove are respectively used to fix two bearings of the motor shaft of the drive motor. A first oil outlet is distributed on the groove wall of the first bearing groove, and a second oil outlet is distributed on the groove wall of the second bearing groove.

[0021] In this embodiment, the first bearing groove is distributed on the inner wall of the motor housing facing the partition plate, and the first oil outlet is distributed on the groove wall of the first bearing groove, so that the first oil outlet can deliver oil into the motor cavity. The first oil outlet is distributed on the groove wall of the first bearing groove, so that the first oil outlet can be arranged using the groove wall of the first bearing groove. Since the first bearing groove is used to fix the bearing of the motor shaft of the drive motor, the first bearing groove can be arranged opposite to the rotor along the axial direction of the drive motor. The first oil outlet is distributed on the groove wall of the first bearing groove, so that the first oil outlet can be arranged opposite to one side of the rotor of the drive motor along the axial direction of the drive motor. Thus, the oil output from the first oil outlet can be delivered to one side of the rotor of the drive motor to cool the rotor of the drive motor.

[0022] In this embodiment, the second bearing groove is located on the side of the partition plate facing the motor housing, and the second oil outlet is located on the groove wall of the second bearing groove, allowing the second oil outlet to deliver oil into the motor cavity. The second oil outlet is located on the groove wall of the second bearing groove, allowing it to be arranged using the groove wall. Since the second bearing groove is used to fix the bearing of the motor shaft of the drive motor, it can be arranged opposite to the rotor along the axial direction of the drive motor. The second oil outlet, located on the groove wall of the second bearing groove, can be arranged opposite to the other side of the rotor along the axial direction of the drive motor, thus allowing the oil output from the second oil outlet to be delivered to the other side of the rotor to cool it.

[0023] In one embodiment, the stator core of the stator is used to fix the stator winding. The end winding of the stator protrudes from the rotor along the axial direction of the drive motor. At least one of the groove walls of the first bearing groove or the second bearing groove protrudes along the axial direction of the drive motor toward the inner region surrounding the end winding of the stator. The first oil outlet is distributed on the groove wall of the first bearing groove, and the second oil outlet is distributed on the groove wall of the second bearing groove. This makes the first and second oil outlets closer to the rotor along the axial direction of the drive motor, which is beneficial for the first and second oil outlets to deliver oil to the rotor. The oil path is shorter, the oil utilization rate is higher, and the cooling efficiency of the drive motor rotor is improved. Alternatively, the first and second bearing grooves can be arranged using the inner region surrounding the end winding of the stator, making the structure of the drive motor more compact. This helps to shorten the axial dimension of the planetary coaxial powertrain and facilitates the miniaturization of the planetary coaxial powertrain.

[0024] In one embodiment, the first oil outlet is used to directly connect to the first internal flow channel to receive the oil output by the heat exchanger through the first internal flow channel, the second oil outlet is used to directly connect to the internal flow channel of the middle partition to receive the oil, and the internal flow channel of the middle partition is used to receive the oil output by the heat exchanger through the second internal flow channel through the internal flow channel of the reducer housing.

[0025] In this embodiment of the application, the first oil outlet is used to directly connect to the first internal flow channel to receive the oil output from the heat exchanger through the first internal flow channel, so that the oil output from the heat exchanger can be transported to the first oil outlet more quickly through the first internal flow channel, and the first oil outlet can deliver the oil to one side of the rotor of the drive motor more quickly, thereby improving the cooling efficiency of the rotor of the drive motor and improving the cooling efficiency of the drive motor.

[0026] In this embodiment, the second oil outlet is used to directly connect to the internal flow channel of the partition plate to receive oil. The internal flow channel of the partition plate is used to receive the oil output from the heat exchanger through the second internal flow channel via the internal flow channel of the reducer housing. This allows the second oil outlet to receive oil from the second internal flow channel of the motor housing through the internal flow channel of the reducer housing and the internal flow channel of the partition plate. This eliminates the need for the internal flow channel of the partition plate to directly connect to the second internal flow channel of the motor housing. Consequently, the partition plate between the mounting surface of the motor housing and the mounting surface of the reducer housing does not need to be equipped with an internal flow channel for directly supplying oil to the second oil outlet. This also reduces the axial dimension of the partition plate exposed in the planetary coaxial powertrain housing, thereby reducing the axial dimension of the planetary coaxial powertrain housing occupied by the partition plate. This allows for the supply of oil to the internal flow channel of the partition plate while reducing the axial length of the planetary coaxial powertrain. Oil is then supplied to the other side of the rotor of the drive motor through the internal flow channel of the partition plate and the second oil outlet, achieving directional active cooling and lubrication of the rotor of the drive motor.

[0027] In one embodiment, the first part of the partition plate is embedded in the slot of the reducer housing, and the inlet of the internal flow channel of the partition plate is distributed on the outer peripheral surface of the first part. The inlet of the internal flow channel of the partition plate is used to receive the oil transmitted by the internal flow channel of the reducer housing directly from the oil outlet hole on the inner wall of the reducer housing. The internal flow channel of the partition plate is used to deliver oil to the second oil outlet hole.

[0028] In this embodiment, the first part of the partition plate is embedded in the slot of the reducer housing. The inlet of the internal flow channel of the partition plate is distributed on the outer peripheral surface of the first part. The inlet of the internal flow channel of the partition plate is used to directly receive the oil transmitted by the internal flow channel of the reducer housing from the oil outlet hole on the inner wall of the reducer housing. This allows the internal flow channel of the reducer housing and the internal flow channel of the partition plate to be directly connected when the partition plate is assembled with the reducer housing, so that no additional seals are needed, which is beneficial to saving materials and also to simplifying the oil circuit structure of the housing.

[0029] In this embodiment, the oil outlet of the internal flow channel of the reducer housing is located on the inner wall of the reducer housing. This allows the oil outlet to not occupy additional space in the reducer cavity, saving space and simplifying the structure. It also results in a shorter path for the oil outlet, enabling faster delivery of oil from the internal flow channel of the reducer housing to the internal flow channel of the partition plate. This, in turn, allows the internal flow channel of the partition plate to deliver oil to the second oil outlet more quickly. The second oil outlet then delivers oil more rapidly to the other side of the drive motor rotor for cooling, thereby improving the cooling efficiency of the drive motor rotor.

[0030] In one embodiment, a second portion of the partition plate is arranged between the mounting surface of the motor housing and the mounting surface of the reducer housing. The side of the partition plate facing the motor housing is used to fit the mounting surface of the motor housing, and the side of the partition plate facing the reducer housing is used to fit the mounting surface of the reducer housing. The second portion includes a connecting hole for connecting the two sides of the second portion. The internal flow channel of the reducer housing is used to receive the oil output by the heat exchanger through the second internal flow channel through the connecting hole.

[0031] In this embodiment, the second part of the partition plate is arranged between the mounting surface of the motor housing and the mounting surface of the reducer housing. The second part includes a connecting hole for connecting the two sides of the second part, so that the second internal flow channel in the motor housing and the internal flow channel in the reducer housing can be connected through the connecting hole of the second part. This allows the oil in the second internal flow channel to enter the internal flow channel of the reducer housing, thereby enabling the internal flow channel of the reducer housing to deliver oil to the internal flow channel of the partition plate. The oil is then delivered to the second oil outlet through the internal flow channel of the partition plate, so that the oil received by the heat exchanger in the second internal flow channel can be delivered to the internal flow channel of the partition plate through the internal flow channel of the reducer housing.

[0032] In this embodiment, the connecting hole in the second part only needs to enable the connection between the second internal flow channel and the internal flow channel of the reducer housing, so that the axial dimension of the second part of the partition plate can be smaller, thereby making the axial dimension occupied by the partition plate smaller. This is beneficial to achieve the cooling of the rotor by delivering oil to the internal flow channel of the reducer housing and the internal flow channel of the partition plate when the axial dimension of the partition plate is smaller.

[0033] In one embodiment, the connecting hole extends through the second part of the partition plate along the axial direction of the drive motor, minimizing the oil passage length of the connecting hole. This allows the oil output from the second internal flow channel to enter the internal flow channel of the reducer housing more quickly, and thus reach the internal flow channel of the partition plate and the second oil outlet more quickly. This improves the efficiency of the oil output from the second oil outlet in cooling the other side of the drive motor rotor, thereby enhancing the cooling efficiency of the drive motor. It also allows for a smaller axial dimension of the second part of the partition plate, which is beneficial for reducing the axial dimension of the planetary coaxial powertrain housing and promoting the miniaturization of the planetary coaxial powertrain.

[0034] In one embodiment, the outlet of the second internal flow channel is distributed on the mounting surface of the motor housing, and the outlet of the second internal flow channel is used to output the oil received from the heat exchanger. The inlet of the internal flow channel of the reducer housing is distributed on the mounting surface of the reducer housing, and the inlet of the internal flow channel of the reducer housing is used to receive the oil output from the outlet of the second internal flow channel. The extension direction of the second internal flow channel is parallel to the axial direction of the drive motor, and the distance between the internal flow channel of the reducer housing and the axis of the drive motor gradually decreases in the direction away from the drive motor.

[0035] In this embodiment, the outlet of the second internal flow channel is located on the mounting surface of the motor housing. This allows the oil in the second internal flow channel of the motor housing to exit through the outlet, eliminating the need for the outlet to be located on the outer periphery of the motor housing and saving on external connecting pipes that communicate with the internal flow channel of the reducer housing. The inlet of the internal flow channel of the reducer housing is located on the mounting surface of the reducer housing. The inlet of the internal flow channel of the reducer housing receives the oil output from the outlet of the second internal flow channel. This eliminates the need for the inlet to be located on the outer periphery of the reducer housing, further saving on external connecting pipes that communicate with the outlet of the second internal flow channel of the motor housing.

[0036] In this embodiment, the outlet of the second internal flow channel is located on the mounting surface of the motor housing, and the inlet of the internal flow channel of the reducer housing is located on the mounting surface of the reducer housing. This allows the connection between the second internal flow channel and the internal flow channel of the reducer housing to be directly achieved through the oil circuit of the planetary coaxial powertrain housing, eliminating the need for additional external pipes and saving space.

[0037] In this embodiment, the extension direction of the second internal flow channel is parallel to the axial direction of the drive motor, making the length of the second internal flow channel of the motor housing shorter. This allows the second internal flow channel of the motor housing to transport the oil output from the heat exchanger to the outlet of the second internal flow channel more quickly, thereby accelerating the speed at which the oil is output from the outlet of the second internal flow channel to the internal flow channel of the reducer housing. Consequently, the internal flow channel of the reducer housing can transport the oil to the second oil outlet more quickly through the internal flow channel of the partition plate, improving the efficiency of the oil output from the second oil outlet for cooling the other side of the rotor of the drive motor.

[0038] In this embodiment, the distance between the internal flow channel of the reducer housing and the axis of the drive motor gradually decreases in the direction away from the drive motor, so that the oil entering the internal flow channel of the reducer housing from the inlet of the internal flow channel can flow under the action of gravity, which helps to reduce oil resistance and reduce oil power loss.

[0039] In one embodiment, the two openings of the connecting hole in the second part are respectively connected to the outlet of the second internal flow channel and the inlet of the internal flow channel of the reducer housing. This allows the oil output from the heat exchanger to flow sequentially through the heat exchanger oil inlet, the second internal flow channel, the outlet of the second internal flow channel, the connecting hole, and the inlet of the internal flow channel of the reducer housing before entering the internal flow channel of the reducer housing.

[0040] In one embodiment, the internal flow channels of the reducer housing include a third internal flow channel and a fourth internal flow channel. The distance between the third internal flow channel and the axis of the drive motor is greater than the distance between the fourth internal flow channel and the axis of the drive motor. The inlet of the third internal flow channel is distributed on the mounting surface of the reducer housing. The fourth internal flow channel and the internal flow channel of the partition plate are used to receive oil from the third internal flow channel.

[0041] In this embodiment, the internal flow channel of the reducer housing includes a third internal flow channel and a fourth internal flow channel. The distance between the third internal flow channel and the axis of the drive motor is greater than the distance between the fourth internal flow channel and the axis of the drive motor. This allows the internal flow channel of the reducer housing to be divided into two segments, the third internal flow channel and the fourth internal flow channel, which are located at different positions. This allows the third internal flow channel and the fourth internal flow channel of the reducer housing to be formed by segmented machining or draft molding. Compared with the entire internal flow channel of the reducer housing, the oil passage of the third internal flow channel and the fourth internal flow channel is shorter, which is beneficial to simplify the machining process, reduce the difficulty of oil passage manufacturing, and reduce the oil passage manufacturing cost.

[0042] In this embodiment, the inlet of the third internal flow channel is located on the mounting surface of the reducer housing, allowing the third internal flow channel to be formed by drafting from the mounting surface of the reducer housing. This also allows the third internal flow channel to receive oil from the second internal flow channel of the motor housing. The fourth internal flow channel and the internal flow channel of the partition plate are used to receive oil from the third internal flow channel, allowing the oil entering the internal flow channel of the reducer housing from the third internal flow channel to be diverted into the fourth internal flow channel and the internal flow channel of the partition plate, respectively. This allows the oil in the internal flow channel of the reducer housing to be delivered to the second oil outlet through the internal flow channel of the partition plate, thereby being output through the second oil outlet to the other side of the rotor of the drive motor in the motor cavity for cooling. It can also be input into the reducer cavity through the fourth internal flow channel for cooling and lubrication of the planetary reducer or differential. This allows for direct active lubrication of the planetary reducer or differential using the internal flow channels of the reducer housing, which is beneficial for improving the lubrication efficiency of the planetary reducer and differential.

[0043] In one embodiment, the reducer housing further includes a first opening for connecting to a fourth internal flow channel and for accommodating a sealing component. The opening of the first opening is away from the reducer cavity, so that the fourth internal flow channel can be directly formed from the first opening to the outside of the reducer housing by draft molding, thereby reducing the difficulty of forming the internal flow channel of the reducer housing and reducing the manufacturing cost of the oil circuit.

[0044] In one embodiment, the side of the partition plate facing the reducer housing includes a third bearing groove and a third oil outlet. The inner wall of the reducer housing facing the partition plate includes a fourth bearing groove and a fourth oil outlet. The third oil outlet is located at the bottom of the third bearing groove, and the fourth oil outlet is located at the bottom of the fourth bearing groove. The third and fourth bearing grooves are used to fix two bearings of the planetary carrier in the planetary reducer, respectively. The third and fourth oil outlets are used to output oil to lubricate the bearings of the planetary carrier in the planetary reducer. Specifically, the third oil outlet receives oil transmitted through the third internal flow channel via the internal flow channel of the partition plate, and the fourth oil outlet receives oil transmitted through the third internal flow channel via the fourth internal flow channel.

[0045] In this embodiment, the side of the partition plate facing the reducer housing includes a third bearing groove and a third oil outlet. The third oil outlet is located at the bottom of the third bearing groove. The third bearing groove is used to fix the bearing of the planetary carrier in the planetary reducer. The third oil outlet is used to receive the oil transmitted by the internal flow channel of the partition plate through the internal flow channel of the partition plate. This allows the third oil outlet to receive the oil from the internal flow channel of the partition plate and output it to the bearing of the planetary carrier, thereby directly lubricating the bearing of the planetary carrier. This is beneficial to improving the lubrication efficiency of the planetary reducer and thus improving the lubrication efficiency of the planetary coaxial powertrain.

[0046] In this embodiment, the inner wall of the reducer housing facing the partition plate includes a fourth bearing groove and a fourth oil outlet. The fourth oil outlet is located at the bottom of the fourth bearing groove and is used to receive oil transmitted through the third internal flow channel through the fourth internal flow channel. This allows the fourth oil outlet to receive oil from the fourth internal flow channel and output it to the bearing of the planetary carrier, thereby directly lubricating the bearing of the planetary carrier. This is beneficial to improving the lubrication efficiency of the planetary reducer and thus improving the lubrication efficiency of the planetary coaxial powertrain.

[0047] In one embodiment, the distance between the position where the internal flow channel of the partition plate connects with the third internal flow channel and the axis of the drive motor is greater than the distance between the position where the fourth internal flow channel connects with the third internal flow channel and the axis of the drive motor.

[0048] In this embodiment, the distance between the position where the internal flow channel of the partition plate connects to the third internal flow channel and the axis of the drive motor is greater than the distance between the position where the fourth internal flow channel connects to the third internal flow channel and the axis of the drive motor. This larger distance allows the position where the internal flow channel of the partition plate connects to the third internal flow channel to be closer to the mounting surface of the reducer housing. This facilitates faster oil flow into the internal flow channel of the partition plate, allowing the oil in the internal flow channel of the partition plate to be output more quickly from the second oil outlet to the other side of the drive motor rotor for cooling, thereby improving the cooling efficiency of the planetary coaxial powertrain. The smaller distance between the position where the fourth internal flow channel connects to the third internal flow channel and the axis of the drive motor allows the oil in the third internal flow channel to be transported to the fourth internal flow channel by gravity, reducing oil resistance and power loss.

[0049] In one embodiment, the inner wall of the reducer housing includes a mounting groove, a fifth oil outlet, and a sixth oil outlet. The mounting groove is used to mount the gear ring of the planetary reducer. The fifth and sixth oil outlets are arranged on both sides of the mounting groove along the axial direction of the drive motor. The fifth oil outlet is located on the side of the mounting groove facing the drive motor and is used to directly connect to a third internal flow channel to receive oil. The inlet of the internal flow channel of the partition plate is used to receive oil output from the fifth oil outlet. The sixth oil outlet is located on the side of the mounting groove away from the drive motor and is used to directly connect to a fourth internal flow channel to receive oil. The oil output from the sixth oil outlet is used to lubricate at least one of the planetary reducer or the differential. The distance between the fifth oil outlet and the motor axis along the radial direction of the drive motor is greater than the distance between the sixth oil outlet and the motor axis.

[0050] In this embodiment, the fifth oil outlet is located on the side of the mounting groove facing the drive motor. The fifth oil outlet is used to directly connect to the third internal flow channel to receive oil. The inlet of the internal flow channel of the partition plate is used to receive the oil output from the fifth oil outlet, making the fifth oil outlet closer to the slot of the reducer housing. This allows the oil input into the third internal flow channel to be transported to the fifth oil outlet more quickly via a short path. It also allows the inlet of the internal flow channel of the partition plate to receive the oil output from the fifth oil outlet more quickly. This facilitates the internal flow channel of the partition plate to transport the oil to the second oil outlet more quickly. The oil is then output from the second oil outlet to the other side of the rotor of the drive motor more quickly to cool the rotor of the drive motor, thereby improving the cooling efficiency of the rotor of the drive motor and thus improving the cooling efficiency of the planetary coaxial powertrain.

[0051] In this embodiment, the sixth oil outlet is located on the side of the mounting groove away from the drive motor. The sixth oil outlet is used to directly connect to the fourth internal flow channel to receive oil. The oil output from the sixth oil outlet is used to lubricate at least one of the planetary reducer or differential. This allows oil to be directly delivered through the fourth internal flow channel and the sixth oil outlet of the reducer housing to lubricate the planetary reducer and differential, achieving active lubrication of the planetary reducer and differential. This is beneficial to improving the lubrication efficiency of the planetary reducer and differential, thereby improving the cooling and lubrication efficiency of the planetary coaxial powertrain.

[0052] In this embodiment, the distance between the fifth oil outlet and the axis of the drive motor along the radial direction is greater than the distance between the sixth oil outlet and the axis of the drive motor. The larger distance between the fifth oil outlet and the axis of the drive motor allows the fifth oil outlet to connect to the third internal flow channel, which is farther away from the axis of the drive motor along the radial direction. The smaller distance between the sixth oil outlet and the axis of the drive motor facilitates the connection of the sixth oil outlet to the fourth internal flow channel, which is closer to the axis of the drive motor along the radial direction.

[0053] In one embodiment, the planetary carrier of the planetary reducer is used to fix the oil collection plate. The oil collection plate is arranged between the planetary carrier and the sixth oil outlet along the axial direction of the drive motor. The oil collection plate is used to receive the oil output from the sixth oil outlet. The oil collection plate includes multiple protrusions, which are used to fix the planetary shaft fixed by the planetary carrier. The internal flow channels of the multiple protrusions are used to input the oil received by the oil collection plate into the shaft hole of the planetary shaft. The oil is output to the planetary gear bearing fixed by the planetary shaft through the radial hole of the planetary shaft, which is connected to the shaft hole of the planetary shaft, to lubricate the planetary gear bearing. This achieves active lubrication of the planetary gear bearing, which is beneficial to improving the cooling and lubrication effect of the planetary reducer, and thus improving the cooling and lubrication efficiency of the planetary coaxial powertrain.

[0054] In one embodiment, the reducer housing further includes a second opening for communicating with a fourth internal flow channel and for accommodating a sealing element. The opening of the second opening faces away from the reducer cavity. The second opening is also for communicating with a sixth oil outlet, which receives oil output from the fourth internal flow channel and outputs oil to cool the differential. The diameter of the second opening is larger than the diameter of the fourth internal flow channel and the diameter of the sixth oil outlet is also larger than the diameter of the sixth oil outlet.

[0055] In this embodiment, the diameter of the second opening is larger than the diameter of the sixth oil outlet and the diameter of the fourth internal flow channel, so that the oil in the fourth internal flow channel of the reducer housing can be temporarily stored at the second opening. When the oil passes through the smaller diameter sixth oil outlet, the oil can be sprayed out faster, so that the oil output from the sixth oil outlet has more power and is more convenient to be sprayed onto the differential.

[0056] In one embodiment, the motor housing includes a filter tank, an oil pump tank, and a heat exchanger oil outlet. The filter tank is used to install the oil filter of the planetary coaxial powertrain, the oil pump tank is used to install the oil pump of the planetary coaxial powertrain, the oil filter is used to filter the oil output by the oil pump of the planetary coaxial powertrain, and the heat exchanger oil outlet is used to supply the oil output by the oil filter to the heat exchanger. The opening of the filter tank faces the partition plate, and the partition plate is used to enclose the opening of the filter tank. The connecting pipe between the filter tank and the heat exchanger oil outlet is distributed along the axial direction of the drive motor. The extension direction of the connecting pipe between the oil pump tank and the filter tank is perpendicular to the extension direction of the connecting pipe between the filter tank and the heat exchanger oil outlet, and the extension direction of the heat exchanger oil outlet is perpendicular to the extension direction of the connecting pipe between the filter tank and the heat exchanger oil outlet.

[0057] In this embodiment, the filter tank is used to install the oil filter of the planetary coaxial powertrain. The opening of the filter tank faces the partition plate, which is used to enclose the opening of the filter tank. This allows the partition plate to be used directly as the cover plate of the filter tank, which helps to simplify the housing structure of the planetary coaxial powertrain and also helps to save materials and reduce weight.

[0058] In this embodiment, the connecting pipe between the filter tank and the oil outlet of the heat exchanger is distributed along the axial direction of the drive motor. The extension direction of the connecting pipe between the oil pump tank and the filter tank is perpendicular to the extension direction of the connecting pipe between the filter tank and the oil outlet of the heat exchanger. This shortens the oil path from the oil pump tank and the filter tank into the oil outlet of the heat exchanger, thus shortening the path for the oil to enter the heat exchanger. This allows the heat exchanger to output the oil to the first and second internal flow channels of the motor housing more quickly, thereby delivering oil to the first and second oil outlets more quickly. The first and second oil outlets respectively deliver oil to cool one side and the other side of the rotor of the drive motor, which is beneficial to improving the cooling efficiency of the rotor of the drive motor.

[0059] In this embodiment, the connecting pipe between the filter tank and the oil outlet of the heat exchanger is distributed along the axial direction of the drive motor, and the extension direction of the oil outlet of the heat exchanger is perpendicular to the extension direction of the connecting pipe between the filter tank and the oil outlet of the heat exchanger, so that the oil outlet of the heat exchanger can protrude from the motor housing away from the motor cavity, thereby facilitating the fixed connection of the oil outlet of the heat exchanger to the heat exchanger distributed on the outer peripheral wall of the motor housing.

[0060] In one embodiment, the motor housing includes a fifth bearing groove and a seventh oil outlet. The fifth bearing groove is located on the outer wall of the motor housing away from the middle partition. The fifth bearing groove is used to fix the outer ring of the bearing of the drive shaft. The inner ring of the bearing of the drive shaft is used to fix one end of the drive shaft. The other end of the drive shaft passes through the shaft cavity of the motor shaft and extends into the reducer cavity to drive and connect to the differential. The seventh oil outlet is located at the bottom of the fifth bearing groove. The seventh oil outlet is used to directly connect to the first internal flow channel. The seventh oil outlet is used to output oil to lubricate the bearing of the fixed drive shaft. The extension direction of the seventh oil outlet is perpendicular to the first internal flow channel.

[0061] In this embodiment, the inner ring of the bearing of the drive shaft is used to fix one end of the drive shaft, and the other end of the drive shaft passes through the shaft cavity of the motor shaft and extends into the reducer cavity to drive and connect the differential, so that the power received by the differential from the planetary reducer can be transmitted to the wheels on both sides of the electric vehicle through the drive shaft.

[0062] In this embodiment, the seventh oil outlet is located at the bottom of the fifth bearing groove. The seventh oil outlet is directly connected to the first internal flow channel and outputs oil to lubricate the bearings of the fixed drive shaft. This allows the drive shaft bearings to be directly lubricated through the oil passages of the planetary coaxial powertrain housing, improving the lubrication efficiency of the drive shaft bearings. Furthermore, the oil in the first internal flow channel can not only be supplied to the first oil outlet for cooling the rotor of the drive motor, but also output through the seventh oil outlet to lubricate the drive shaft bearings. The first and seventh oil outlets share the same first internal flow channel, simplifying the oil passages of the planetary coaxial powertrain housing.

[0063] In this embodiment, the extension direction of the seventh oil outlet is perpendicular to the first internal flow channel. The seventh oil outlet is distributed at the bottom of the fifth bearing groove. The fifth bearing groove is used to fix the outer ring of the bearing of the drive shaft, which makes it easier for the seventh oil outlet to lubricate the bearing of the drive shaft.

[0064] Secondly, this application provides an electric vehicle, which includes wheels and a planetary coaxial powertrain as described in the first aspect, the planetary coaxial powertrain being used to drive the wheels.

[0065] In the planetary coaxial powertrain of this application embodiment, oil output from the heat exchanger is received through the first internal flow channel of the motor housing and delivered to the first oil outlet to cool one side of the rotor of the drive motor. Oil output from the heat exchanger is received through the second internal flow channel of the motor housing and delivered to the second oil outlet of the partition plate to cool the other side of the rotor of the drive motor. This allows oil to be delivered directly to both sides of the rotor of the drive motor through the oil circuit of the planetary coaxial powertrain housing, enabling direct and effective cooling of the rotor of the drive motor. This results in better cooling of the rotor of the drive motor, which in turn improves the cooling effect of the drive motor and thus the overall cooling effect of the planetary coaxial powertrain. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0067] Figure 1 This is a schematic diagram of an electric vehicle provided in an embodiment of this application; Figure 2 This is a schematic diagram of a planetary coaxial powertrain provided in an embodiment of this application; Figure 3 This is another schematic diagram of the planetary coaxial powertrain provided in the embodiments of this application; Figure 4 This is a cross-sectional view of a planetary coaxial powertrain provided in an embodiment of this application; Figure 5 This is another cross-sectional view of the planetary coaxial powertrain provided in the embodiments of this application; Figure 6 This is an exploded view of the housing of the planetary coaxial powertrain provided in an embodiment of this application; Figure 7 This is a schematic diagram of a motor housing provided in an embodiment of this application; Figure 8 yes Figure 4 A partial enlarged view of the M1 section of the planetary coaxial powertrain; Figure 9 yes Figure 5 A partial enlarged view of the M2 section of the planetary coaxial powertrain; Figure 10 This is a cross-sectional view of the reducer housing provided in an embodiment of this application; Figure 11 yes Figure 4 A partial enlarged view of the M3 section of the planetary coaxial powertrain; Figure 12 This is a cross-sectional view of a planetary reducer provided in an embodiment of this application. Detailed Implementation

[0068] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0069] This application provides a planetary coaxial powertrain. The planetary coaxial powertrain housing includes a motor housing, a partition plate, and a reducer housing. The two sides of the partition plate enclose the motor housing and the reducer housing to form a motor cavity and a reducer cavity, respectively. The motor cavity houses the stator and rotor of the drive motor, and the reducer cavity houses the planetary reducer and the differential. The drive motor drives the planetary reducer to drive the differential. The differential drives the wheels of the electric vehicle via a drive shaft, which passes through the shaft cavity of the drive motor's shaft to drive the differential. The motor housing includes a first oil outlet located on the inner wall of the motor housing facing the partition plate. The first oil outlet receives oil output from the heat exchanger of the planetary coaxial powertrain through a first internal flow channel in the motor housing. The oil output from the first oil outlet cools one side of the rotor of the drive motor. The partition plate includes a second oil outlet, which is located on the side of the partition plate facing the motor housing. The second oil outlet is used to receive oil output from the heat exchanger of the planetary coaxial powertrain through the second internal flow channel of the motor housing. The oil output from the second oil outlet is used to cool the other side of the rotor of the drive motor.

[0070] The first internal flow channel of the motor housing receives oil output from the heat exchanger and delivers it to the first oil outlet to cool one side of the drive motor rotor. The second internal flow channel of the motor housing receives oil output from the heat exchanger and delivers it to the second oil outlet of the partition plate to cool the other side of the drive motor rotor. This allows oil to be directly supplied to both sides of the drive motor rotor through the oil circuit of the planetary coaxial powertrain housing, enabling direct and effective cooling of the drive motor rotor. This results in better cooling of the drive motor rotor, which in turn improves the cooling effect of the drive motor and, consequently, the overall cooling effect of the planetary coaxial powertrain.

[0071] This application provides a planetary coaxial powertrain, which is applied to electric vehicles to improve their performance.

[0072] Figure 1 This is a schematic diagram of an electric vehicle 1 provided in an embodiment of this application.

[0073] In one embodiment, the electric vehicle 1 includes a planetary coaxial powertrain 10, a frame 20, and a power battery 30, such as Figure 1As shown, the frame 20 is used to mount the planetary coaxial powertrain 10 and the power battery 30. In this embodiment, the electric vehicle 1 refers to a wheeled device driven or towed by a power unit. In this embodiment, the planetary coaxial powertrain 10 is used to drive the wheels 40.

[0074] Figure 2 This is a schematic diagram of a planetary coaxial powertrain 10 provided in an embodiment of this application. Figure 3 This is another schematic diagram of the planetary coaxial powertrain 10 provided in the embodiments of this application. Figure 4 This is a cross-sectional view of the planetary coaxial powertrain 10 provided in an embodiment of this application.

[0075] In one embodiment, such as Figure 2 and Figure 3 As shown, the planetary coaxial powertrain 10 includes a drive motor 100, a planetary reducer 200, and a motor controller 300.

[0076] In the embodiments of this application, such as Figures 2 to 4 As shown, the drive motor 100 includes a stator 101, a rotor 102, and a motor shaft 103, while the planetary reducer 200 includes a gear set. The motor controller 300 receives power from the power battery 30. The rotor 102 of the drive motor 100 is fixedly mounted on the motor shaft 103. After receiving current from the motor controller 300, the stator 101 drives the rotor 102 to rotate, thereby causing the motor shaft 103 to rotate. The motor shaft 103 of the drive motor 100 transmits kinetic energy to the gear set of the planetary reducer 200, which in turn transmits power to the wheel 40 via the half-shaft, driving the wheel 40 to move.

[0077] In one embodiment, such as Figure 4 As shown, the planetary reducer 200 includes a planetary gear set 200a, which comprises a sun gear (not shown), multiple planet gears (not shown), a planet carrier 201, a ring gear 202, and multiple planet shafts 203. The sun gear of the planetary gear set receives power, the planet carrier 201 outputs power, and the multiple planet gears mesh between the sun gear and the ring gear 202. In one embodiment, the sun gear of the planetary gear set is used to drive the motor shaft 103 of the drive motor 100, and the planet carrier 201 is used to drive the half-shaft of the wheel 40. The half-shaft of the wheel 40 is coaxially arranged with the motor shaft 103 of the drive motor 100.

[0078] In one embodiment, such as Figure 4 As shown, the planetary coaxial powertrain 10 also includes a differential 400, the planet carrier 201 of the planetary reducer 200 is used for transmission connection of the differential 400, and the differential 400 is used for transmission connection of the half shaft of the wheel 40.

[0079] To ensure the proper functioning of the drive motor and reducer in a planetary coaxial powertrain, oil is typically circulated to cool and lubricate the drive motor and the planetary reducer. However, due to the compact structure of the drive motor and planetary reducer in the powertrain, it is difficult to circulate oil into the powertrain, resulting in insufficient cooling and lubrication efficiency.

[0080] This application utilizes the first internal flow channel of the motor housing to receive oil output from the heat exchanger and deliver oil to the first oil outlet to cool one side of the drive motor rotor. It also utilizes the second internal flow channel of the motor housing to receive oil output from the heat exchanger and deliver oil to the second oil outlet of the partition plate to cool the other side of the drive motor rotor. This allows oil to be directly delivered to both sides of the drive motor rotor through the oil circuit of the planetary coaxial powertrain housing, achieving direct and effective cooling of the drive motor rotor. This results in better cooling of the drive motor rotor, improving the overall cooling effect of the drive motor and, consequently, the cooling effect of the planetary coaxial powertrain.

[0081] The planetary coaxial powertrain 10 provided in the embodiments of this application will be described in detail below.

[0082] Figure 5 This is another cross-sectional view of the planetary coaxial powertrain 10 provided in the embodiments of this application. Figure 6 This is an exploded view of the housing 500 of the planetary coaxial powertrain 10 provided in the embodiments of this application.

[0083] In one embodiment, such as Figure 4 and Figure 6 As shown, the housing 500 of the planetary coaxial powertrain 10 includes a motor housing 510, a partition 520, and a reducer housing 530. The two sides 5201 and 5202 of the partition 520 are used to enclose the motor housing 510 and the reducer housing 530 to form a motor cavity 510a and a reducer cavity 530a, respectively. The motor cavity 510a is used to accommodate the stator 101 and rotor 102 of the drive motor 100. The reducer cavity 530a is used to accommodate the planetary reducer 200 and the differential 400. The drive motor 100 is used to drive the planetary reducer 200 to drive the differential 400. The differential 400 is used to drive the wheels 40 of the electric vehicle 1 through the drive shaft 204. The drive shaft 204 is used to drive the differential 400 through the shaft cavity 1030 of the motor shaft 103 of the drive motor 100.

[0084] In the embodiments of this application, such as Figure 6As shown, the motor housing 510, the partition plate 520, and the reducer housing 530 of the planetary coaxial powertrain 10 are detachable, separate structures. In one embodiment, fasteners pass sequentially along the axial direction O of the drive motor 100 through the mounting surface 5301 of the reducer housing 530, the partition plate 520, and the mounting surface 5101 of the motor housing 510, thereby assembling and fixing the motor housing 510, the partition plate 520, and the reducer housing 530 together.

[0085] In one embodiment, such as Figure 3 As shown, the planetary coaxial powertrain 10 also includes a heat exchanger 600, an oil pump 700, and an oil filter 800. The oil filter 800 is used to filter the oil output by the oil pump 700, and the heat exchanger 600 is used to exchange heat with the oil output by the oil filter 800 and to cool down the oil input into the heat exchanger 600.

[0086] Figure 7 This is a schematic diagram of a motor housing 510 provided in an embodiment of this application. Figure 8 yes Figure 4 A partially enlarged view of the M1 section of the planetary coaxial powertrain 10. Figure 9 yes Figure 5 A partial enlarged view of the M2 section of the planetary coaxial powertrain 10. Figure 10 This is a cross-sectional view of the reducer housing 530 provided in an embodiment of this application.

[0087] In one embodiment, such as Figures 4 to 9 As shown, the motor housing 510 includes a first internal flow channel 5102, a second internal flow channel 5103, a first oil outlet 5104, and a heat exchanger oil inlet 5105. The partition plate 520 includes a second oil outlet 5203, a third oil outlet 5204, and a connecting hole 5205. The heat exchanger oil inlet 5105 is used to receive the oil output from the heat exchanger 600. The oil entering the motor housing 5100 from the heat exchanger oil inlet 5105 is split into two streams that flow into the first internal flow channel 5102 and the second internal flow channel 5103 respectively. Figure 9 As shown, one path of oil is directly supplied from the first internal flow channel 5102 of the motor housing 510 to the first oil outlet 5104, and output from the first oil outlet 5104 to cool one side 1021 of the rotor 102 of the drive motor 100. Another path of oil is supplied from the second internal flow channel 5103 of the motor housing 510 through the connecting hole 5205 of the partition plate 520 into the internal flow channel 5302 of the reducer housing 530, and then into the internal flow channel 5206 of the partition plate 520, as shown. Figure 8As shown, oil is output from the second oil outlet 5203 through the internal flow channel 5206 of the partition 520 to cool the rotor 102 of the drive motor 100 on the other side 1022. Oil can also be transported through the internal flow channel 5206 of the partition 520 to the third oil outlet 5204 for lubrication of the bearing 205a of the planetary carrier 201 of the planetary reducer 200. This allows for direct cooling of the drive motor 100 and lubrication of the planetary reducer 200 through the oil circuit of the housing 500 of the planetary coaxial powertrain 10, facilitating fully active cooling and lubrication of the planetary coaxial powertrain 10 and improving its cooling and lubrication efficiency. In this design, the flow and distribution of oil can be precisely controlled through the oil circuit design of the housing 500, ensuring efficient operation of the oil cooling system of the planetary coaxial powertrain 10 under high speed and heavy load conditions.

[0088] In one embodiment, such as Figure 10 As shown, the reducer housing 530 includes a third internal flow channel 5303, a fourth internal flow channel 5304, a fourth oil outlet 5305, a fifth oil outlet 5306, and a sixth oil outlet 5307, as follows. Figure 4 and Figure 10 As shown, the oil in the second internal flow channel 5103 of the motor housing 510 enters the third internal flow channel 5303 in the internal flow channel 5302 of the reducer housing 530 through the connecting hole 5205 of the partition plate 520. The oil in the third internal flow channel 5303 flows into the internal flow channel 5206 of the partition plate 520 through the fifth oil outlet 5306. The oil in the third internal flow channel 5303 can also flow into the fourth internal flow channel 5304, through which the oil is transported to the fourth oil outlet 5305 and the sixth oil outlet 5307. The fourth oil outlet 5305 is used to output oil to cool another bearing 205b of the planetary carrier 201 of the planetary reducer 200, and the sixth oil outlet 5307 is used to output oil to cool at least one of the planetary reducer 200 or the differential 400. This allows the drive motor 100 to be cooled and the planetary reducer 200 and differential 400 to be lubricated directly through the oil circuit of the housing 500 of the planetary coaxial powertrain 10. This is beneficial for the planetary coaxial powertrain 10 to achieve fully active cooling and lubrication, and for improving the cooling and lubrication efficiency of the planetary coaxial powertrain 10.

[0089] In one embodiment, such as Figure 5 and Figure 9As shown, the motor housing 510 includes a first oil outlet 5104, which is distributed on the inner wall 5106 of the motor housing 510 facing the partition plate 520. The first oil outlet 5104 is used to receive oil output from the heat exchanger 600 of the planetary coaxial powertrain 10 through the first internal flow channel 5102 of the motor housing 510. The oil output from the first oil outlet 5104 is used to cool one side 1021 of the rotor 102 of the drive motor 100. Figure 4 and Figure 8 As shown, the partition plate 520 includes a second oil outlet 5203, which is distributed on one side 5201 of the partition plate 520 facing the motor housing 510. The second oil outlet 5203 is used to receive oil output from the heat exchanger 600 of the planetary coaxial powertrain 10 through the second internal flow channel 5103 of the motor housing 510. The oil output from the second oil outlet 5203 is used to cool the other side 1022 of the rotor 102 of the drive motor 100.

[0090] In this embodiment, the first oil outlet 5104 is distributed on the inner wall 5106 of the motor housing 510 facing the partition plate 520. The first oil outlet 5104 is used to receive the oil output from the heat exchanger 600 of the planetary coaxial powertrain 10 through the first internal flow channel 5102 of the motor housing 510. The oil output from the first oil outlet 5104 is used to cool one side 1021 of the rotor 102 of the drive motor 100. This allows the oil output from the heat exchanger 600 to be transported to the first oil outlet 5104 through the first internal flow channel 5102 of the motor housing 510. The oil is then directed to one side 1021 of the rotor 102 of the drive motor 100 through the first oil outlet 5104, thereby achieving direct and effective cooling of the rotor 102 of the drive motor 100, improving the cooling effect of the drive motor 100, and thus improving the cooling effect of the planetary coaxial powertrain 10.

[0091] In this embodiment, the second oil outlet 5203 is distributed on the side 5201 of the partition plate 520 facing the motor housing 510. The second oil outlet 5203 is used to receive the oil output from the heat exchanger 600 of the planetary coaxial powertrain 10 through the second internal flow channel 5103 of the motor housing 510. The oil output from the second oil outlet 5203 is used to cool the other side 1022 of the rotor 102 of the drive motor 100, so that the oil can be transported to the second oil outlet 5203 of the partition plate 520 through the second internal flow channel 5103 of the motor housing 510, and the oil is directionally transported to the other side 1022 of the rotor 102 of the drive motor 100 by the second oil outlet 5203, thereby achieving direct and effective cooling of the rotor 102 of the drive motor 100. In one embodiment, the second internal flow channel 5103 of the motor housing 510 delivers oil to the internal flow channel 5206 of the partition plate 520 through the internal flow channel 5302 of the reducer housing 530, and then delivers the oil to the second oil outlet 5203 through the internal flow channel 5206 of the partition plate 520. In another embodiment, the second internal flow channel 5103 of the motor housing 510 directly inputs oil into the internal flow channel 5206 of the partition plate 520, and the internal flow channel 5206 of the partition plate 520 delivers the oil to the second oil outlet 5203.

[0092] In this embodiment, the first internal flow channel 5102 of the motor housing 510 receives the oil output from the heat exchanger 600 and delivers the oil to the first oil outlet 5104 to cool one side 1021 of the rotor 102 of the drive motor 100. The second internal flow channel 5103 of the motor housing 510 receives the oil output from the heat exchanger 600 and delivers the oil to the second oil outlet 5203 of the partition plate 520 to cool the other side 1022 of the rotor 102 of the drive motor 100. This allows oil to be directly and directionally delivered to the rotor 102 of the drive motor 100 through the oil circuit of the housing 500 of the planetary coaxial powertrain 10, enabling direct and effective cooling of the rotor 102 of the drive motor 100. This results in better cooling of the rotor 102 of the drive motor 100, which in turn improves the cooling effect of the drive motor 100 and, consequently, the cooling effect of the planetary coaxial powertrain 10.

[0093] In this embodiment, the oil passage of the housing 500 of the planetary coaxial powertrain 10 directly cools the rotor 102 of the drive motor 100. Compared to cooling the rotor 102 by supplying oil through the shaft cavity 1030 of the motor shaft 103 and then through the oil hole of the motor shaft 103, the direct supply of oil to the rotor 102 through the housing 500 reduces the manufacturing cost of the oil passage. Furthermore, supplying oil to the rotor 102 through the shaft cavity 1030 of the motor shaft 103 can easily lead to drag losses.

[0094] In one embodiment, such as Figure 4 and Figure 5 As shown, the distance between the first oil outlet hole 5104 along the radial direction R of the drive motor 100 and the axis N of the drive motor 100 is greater than half the inner diameter of the end ring 1023 on one side 1021 of the rotor 102, and the distance between the first oil outlet hole 5104 along the radial direction R of the drive motor 100 and the axis N of the drive motor 100 is less than half the outer diameter of the end ring 1023 on one side 1021 of the rotor 102.

[0095] In this embodiment, the oil output from the first oil outlet 5104 can be delivered to the end ring 1023 on one side 1021 of the rotor 102, thereby cooling one side 1021 of the rotor 102. When the rotor 102 rotates, the oil delivered to the end ring 1023 can be thrown onto the end winding 1011 of the stator 101, thereby cooling the stator 101, improving the utilization efficiency of the oil, enhancing the cooling effect of the drive motor 100, and further enhancing the cooling effect of the planetary coaxial powertrain 10.

[0096] In one embodiment, such as Figure 4 and Figure 5 As shown, the distance between the second oil outlet 5203 along the radial direction R of the drive motor 100 and the axis N of the drive motor 100 is greater than half the inner diameter of the end ring 1024 on the other side 1022 of the rotor 102, and the distance between the second oil outlet 5203 along the radial direction R of the drive motor 100 and the axis N of the drive motor 100 is less than half the outer diameter of the end ring 1024 on the other side 1022 of the rotor 102.

[0097] In this embodiment, the oil output from the second oil outlet 5203 can be delivered to the end ring 1024 on the other side 1022 of the rotor 102, thereby cooling the other side 1022 of the rotor 102. When the rotor 102 rotates, the oil delivered to the end ring 1024 can be thrown onto the end winding 1011 of the stator 101, thereby cooling the stator 101, improving the utilization efficiency of the oil, enhancing the cooling effect of the drive motor 100, and further enhancing the cooling effect of the planetary coaxial powertrain 10.

[0098] In one embodiment, such as Figure 5 As shown, the first internal flow channel 5102 of the motor housing 510 extends parallel to the radial direction R of the drive motor 100, the second internal flow channel 5103 of the motor housing 510 extends parallel to the axial direction O of the drive motor 100, and the first oil outlet 5104 extends parallel to the axial direction O of the drive motor 100, as shown. Figure 4 and Figure 8As shown, the extension direction of the second oil outlet 5203 is parallel to the axial direction O of the drive motor 100. The flow direction of the oil in the first oil outlet 5104 is opposite to the flow direction of the oil in the second oil outlet 5203. The flow direction of the oil in the first oil outlet 5104 is the same as the flow direction of the oil in the second internal flow channel 5103 of the motor housing 510.

[0099] In this embodiment, the extension direction of the first internal flow channel 5102 of the motor housing 510 is parallel to the radial direction R of the drive motor 100, which makes the length of the first internal flow channel 5102 of the motor housing 510 shorter. This allows the first internal flow channel 5102 of the motor housing 510 to deliver the oil output from the heat exchanger 600 to the first oil outlet 5104 more quickly, thereby improving the efficiency of the oil output from the first oil outlet 5104 to cool one side 1021 of the rotor 102 of the drive motor 100.

[0100] In this embodiment, the extension direction of the second internal flow channel 5103 of the motor housing 510 is parallel to the axial direction O of the drive motor 100, which makes the length of the second internal flow channel 5103 of the motor housing 510 shorter. This allows the second internal flow channel 5103 of the motor housing 510 to deliver the oil output from the heat exchanger 600 to the second oil outlet 5203 more quickly, thereby improving the efficiency of the oil output from the second oil outlet 5203 for cooling the other side 1022 of the rotor 102 of the drive motor 100.

[0101] In this embodiment, the first oil outlet 5104 extends parallel to the axial direction O of the drive motor 100, which facilitates the first oil outlet 5104 in delivering oil to a position farther along the axial direction O of the drive motor 100, thus facilitating the delivery of oil from the first oil outlet 5104 to one side 1021 of the rotor 102 of the drive motor 100. Similarly, the second oil outlet 5203 extends parallel to the axial direction O of the drive motor 100, which facilitates the second oil outlet 5203 in delivering oil to a position farther along the axial direction O of the drive motor 100, thus facilitating the delivery of oil from the second oil outlet 5203 to the other side 1022 of the rotor 102 of the drive motor 100.

[0102] In this embodiment, the flow direction of the oil in the first oil outlet 5104 is opposite to that in the second oil outlet 5203, so that the oil output from the first oil outlet 5104 can be delivered to one side 1021 of the rotor 102 of the drive motor 100, while the oil output from the second oil outlet 5203 can be delivered to the other side 1022 of the rotor 102 of the drive motor 100, thereby achieving cooling of both sides 1021 and 1022 of the rotor 102, making the cooling of the rotor 102 by the oil more uniform and effective.

[0103] In one embodiment, such as Figure 6 and Figure 7 As shown, the motor housing 510 includes a heat exchanger oil inlet 5105, which is used to receive the oil output from the heat exchanger 600. The extension direction of the heat exchanger oil inlet 5105 is parallel to the radial direction R of the drive motor 100, and the extension direction of the heat exchanger oil inlet 5105 is perpendicular to the extension direction of the second internal flow channel 5103.

[0104] In this embodiment, the motor housing 510 includes a heat exchanger oil inlet 5105, which is used to receive the oil output from the heat exchanger 600. This allows the first internal flow channel 5102 and the second internal flow channel 5103 of the motor housing 510 to receive the oil output from the heat exchanger 600 through the heat exchanger oil inlet 5105. As a result, the oil can be transported through the oil circuit of the housing 500 of the planetary coaxial powertrain 10 to cool the rotor 102 of the drive motor 100.

[0105] In the embodiments of this application, such as Figures 5 to 7 As shown, the extension direction of the heat exchanger oil inlet 5105 is parallel to the radial direction R of the drive motor 100, so that the oil output from the heat exchanger 600 received by the heat exchanger oil inlet 5105 can be more smoothly input into the first oil outlet 5104 distributed on the inner wall 5106 of the motor housing 510 facing the middle partition 520 along the radial direction R of the drive motor 100. This facilitates the faster output of oil from the first oil outlet 5104 to cool one side 1021 of the rotor 102 of the drive motor 100.

[0106] In the embodiments of this application, such as Figure 4 As shown, since the second internal flow channel 5103 needs to transport oil to the second oil outlet 5203 of the partition plate 520, as Figure 6 As shown, the extension direction of the heat exchanger oil inlet 5105 is perpendicular to the extension direction of the second internal flow channel 5103. This makes it easier to make the length of the heat exchanger oil inlet 5105 and the length of the second internal flow channel 5103 shorter. This is beneficial for the oil input from the heat exchanger oil inlet 5105 to reach the second oil outlet 5203 of the partition plate 520 more quickly, so as to cool down the other side 1022 of the rotor 102 of the drive motor 100 and improve the cooling efficiency of the drive motor 100.

[0107] in, Figure 7 Heat exchanger 600 in the diagram represents only a schematic location and does not indicate its specific structure. For the specific structure of heat exchanger 600, please refer to [link / reference needed]. Figure 3 .

[0108] In one embodiment, such as Figure 7As shown, the extending direction of the heat exchanger oil inlet 5105 intersects the extending direction of the first internal flow channel 5102, and the angle between the extending direction of the heat exchanger oil inlet 5105 and the extending direction of the first internal flow channel 5102 is greater than 90°. This simplifies the design requirements for the first internal flow channel 5102 and the heat exchanger oil inlet 5105, helps reduce the manufacturing difficulty of the oil passages in the shell 500, simplifies the process, and reduces manufacturing costs.

[0109] In one embodiment, such as Figure 4 and Figure 5 As shown, the motor housing 510 includes a first bearing groove 5107, which is distributed on the inner wall 5106 of the motor housing 510 facing the central partition 520, as shown. Figure 4 and Figure 8 As shown, the partition 520 includes a second bearing groove 5207, which is distributed on one side 5201 of the partition 520 facing the motor housing 510. The first bearing groove 5107 and the second bearing groove 5207 are respectively used to fix the two bearings 104 of the motor shaft 103 of the drive motor 100, as shown. Figure 5 As shown, the first oil outlet 5104 is distributed on the groove wall 5108 of the first bearing groove 5107, as... Figure 8 As shown, the second oil outlet 5203 is distributed on the groove wall 5208 of the second bearing groove 5207.

[0110] In this embodiment, the first bearing groove 5107 is distributed on the inner wall 5106 of the motor housing 510 facing the partition plate 520, and the first oil outlet 5104 is distributed on the groove wall 5108 of the first bearing groove 5107, so that the first oil outlet 5104 can deliver oil into the motor cavity 510a. The first oil outlet 5104 is distributed on the groove wall 5108 of the first bearing groove 5107, so that the first oil outlet 5104 can be arranged using the groove wall 5108 of the first bearing groove 5107. Since the first bearing groove 5107 is used to fix the bearing 104a of the motor shaft 103 of the drive motor 100, the first bearing groove 5107 and the rotor 102 are arranged opposite to each other along the axial direction O of the drive motor 100, so that the first oil outlet 5104 can be arranged opposite to one side 1021 of the rotor 102 of the drive motor 100 along the axial direction O of the drive motor 100, thereby allowing the oil output from the first oil outlet 5104 to be transported to one side 1021 of the rotor 102 of the drive motor 100 to cool down the rotor 102 of the drive motor 100.

[0111] In this embodiment, the second bearing groove 5207 is distributed on the side 5201 of the partition plate 520 facing the motor housing 510, and the second oil outlet 5203 is distributed on the groove wall 5208 of the second bearing groove 5207, so that the second oil outlet 5203 can deliver oil into the motor cavity 510a. The second oil outlet 5203 is distributed on the groove wall 5208 of the second bearing groove 5207, so that the second oil outlet 5203 can be arranged using the groove wall 5208 of the second bearing groove 5207. Since the second bearing groove 5207 is used to fix the bearing 104b of the motor shaft 103 of the drive motor 100, the second bearing groove 5207 and the rotor 102 are arranged opposite to each other along the axial direction O of the drive motor 100, so that the second oil outlet 5203 can be arranged opposite to the other side 1022 of the rotor 102 of the drive motor 100 along the axial direction O of the drive motor 100. Thus, the oil output from the second oil outlet 5203 can be transported to the other side 1022 of the rotor 102 of the drive motor 100 to cool down the rotor 102 of the drive motor 100.

[0112] In one embodiment, such as Figure 4 and Figure 5 As shown, the stator core 1012 of the stator 101 is used to fix the stator winding 1013. The end winding 1011 of the stator 101 protrudes from the rotor 102 along the axial direction O of the drive motor 100. At least one of the groove wall 5108 of the first bearing groove 5107 or the groove wall 5208 of the second bearing groove 5207 protrudes along the axial direction O of the drive motor 100 toward the inner region surrounding the end winding 1011 of the stator 101. The first oil outlet 5104 is distributed in the first bearing groove 5107. The second oil outlet 5203 is distributed on the groove wall 5108 of the second bearing groove 5207, making the first oil outlet 5104 and the second oil outlet 5203 closer to the rotor 102 along the axial direction O of the drive motor 100. This facilitates the delivery of oil from the first oil outlet 5104 and the second oil outlet 5203 to the rotor 102, resulting in a shorter oil path and higher oil utilization, which is beneficial to improving the cooling efficiency of the rotor 102 of the drive motor 100. Furthermore, the first bearing groove 5107 and the second bearing groove 5207 can be arranged within the inner area surrounded by the end winding 1011 of the stator 101, making the structure of the drive motor 100 more compact. This helps to shorten the axial dimension of the planetary coaxial powertrain 10, facilitating the miniaturization of the planetary coaxial powertrain 10.

[0113] In one embodiment, such as Figure 5 and Figure 7 As shown, the first oil outlet 5104 is used to directly connect to the first internal flow channel 5102 to receive the oil output from the heat exchanger 600 through the first internal flow channel 5102, such as... Figure 4As shown, the second oil outlet 5203 is used to directly connect to the internal flow channel 5206 of the partition plate 520 to receive oil. The internal flow channel 5206 of the partition plate 520 is used to receive the oil output by the heat exchanger 600 through the second internal flow channel 5103 through the internal flow channel 5302 of the reducer housing 530.

[0114] In this embodiment, the first oil outlet 5104 is used to directly connect to the first internal flow channel 5102 to receive the oil output from the heat exchanger 600 through the first internal flow channel 5102. This allows the oil output from the heat exchanger 600 to be transported to the first oil outlet 5104 more quickly through the first internal flow channel 5102. This allows the first oil outlet 5104 to transport the oil to one side 1021 of the rotor 102 of the drive motor 100 more quickly, thereby improving the cooling efficiency of the rotor 102 of the drive motor 100 and improving the cooling efficiency of the drive motor 100.

[0115] In the embodiments of this application, such as Figure 4 and Figure 6 As shown, the second oil outlet 5203 is used to directly connect to the internal flow channel 5206 of the partition plate 520 to receive oil. The internal flow channel 5206 of the partition plate 520 is used to receive the oil output from the heat exchanger 600 through the second internal flow channel 5103 via the internal flow channel 5302 of the reducer housing 530. This allows the second oil outlet 5203 to receive oil from the second internal flow channel 5103 of the motor housing 510 through the internal flow channel 5302 of the reducer housing 530 and the internal flow channel 5206 of the partition plate 520. This eliminates the need for the internal flow channel 5206 of the partition plate 520 to directly connect to the second internal flow channel 5103 of the motor housing 510, thereby facilitating the connection between the mounting surface 5101 of the motor housing 510 and the mounting surface 5103 of the reducer housing 530. The partition 520 between 301 does not need to be equipped with an internal flow channel 5206 for directly supplying oil to the second oil outlet 5203. This is beneficial to reduce the axial dimension of the partition 520 exposed in the housing 500 of the planetary coaxial powertrain 10, thereby reducing the axial dimension of the housing 500 occupied by the partition 520. This allows for the delivery of oil to the internal flow channel 5206 of the partition 520 while reducing the axial length of the planetary coaxial powertrain 10. Oil is then delivered to the other side 1022 of the rotor 102 of the drive motor 100 through the internal flow channel 5206 and the second oil outlet 5203, achieving directional active cooling and lubrication of the rotor 102 of the drive motor 100.

[0116] Figure 11 yes Figure 4 A partial enlarged view of the M3 section of the planetary coaxial powertrain 10.

[0117] In one embodiment, such as Figure 6 , Figure 10 and Figure 11 As shown, the first part 5209 of the partition plate 520 is embedded in the slot 5308 of the reducer housing 530. The inlet 5211 of the internal flow channel 5206 of the partition plate 520 is distributed on the outer peripheral surface 5210 of the first part 5209. The inlet 5211 of the internal flow channel 5206 of the partition plate 520 is used to directly receive the oil transmitted from the internal flow channel 5302 of the reducer housing 530 from the oil outlet 5309 on the inner wall of the reducer housing 530. Figure 8 As shown, the internal flow channel 5206 of the partition plate 520 is used to deliver oil to the second oil outlet 5203.

[0118] In this embodiment, the first part 5209 of the partition plate 520 is embedded in the slot 5308 of the reducer housing 530. The inlet 5211 of the internal flow channel 5206 of the partition plate 520 is distributed on the outer peripheral surface 5210 of the first part 5209. The inlet 5211 of the internal flow channel 5206 of the partition plate 520 is used to directly receive the oil transmitted from the internal flow channel 5302 of the reducer housing 530 from the oil outlet hole 5309 on the inner wall of the reducer housing 530. This allows the internal flow channel 5302 of the reducer housing 530 and the internal flow channel 5206 of the partition plate 520 to be directly connected when the partition plate 520 is assembled with the reducer housing 530. This eliminates the need for additional seals, saves materials, and simplifies the oil circuit structure of the housing 500.

[0119] In the embodiments of this application, such as Figure 8 , Figure 10 and Figure 11 As shown, the oil outlet 5309 of the internal flow channel 5302 of the reducer housing 530 is located on the inner wall of the reducer housing 530. This allows the oil outlet 5309 to not occupy additional space in the reducer cavity 530a, which is beneficial for saving space and simplifying the structure. It also makes the path of the oil outlet 5309 shorter, which can more quickly transport the oil in the internal flow channel 5302 of the reducer housing 530 to the internal flow channel 5206 of the partition plate 520. This allows the internal flow channel 5206 of the partition plate 520 to transport the oil to the second oil outlet 5203 more quickly. The second oil outlet 5203 then transports the oil to the other side 1022 of the rotor 102 of the drive motor 100 more quickly to cool the rotor 102 of the drive motor 100, thereby improving the cooling efficiency of the rotor 102 of the drive motor 100.

[0120] In one embodiment, such as Figure 6 and Figure 11As shown, the second part 5212 of the partition plate 520 is arranged between the mounting surface 5101 of the motor housing 510 and the mounting surface 5301 of the reducer housing 530. The side 5201 of the partition plate 520 facing the motor housing 510 is used to fit the mounting surface 5101 of the motor housing 510, and the side 5202 of the partition plate 520 facing the reducer housing 530 is used to fit the mounting surface 5301 of the reducer housing 530. The second part 5212 includes a connecting hole 5205, which is used to connect the two sides of the second part 5212. The internal flow channel 5302 of the reducer housing 530 is used to receive the oil output by the heat exchanger 600 through the second internal flow channel 5103 through the connecting hole 5205.

[0121] In the embodiments of this application, such as Figure 4 , Figure 6 and Figure 11 As shown, the second portion 5212 of the partition plate 520 is arranged between the mounting surface 5101 of the motor housing 510 and the mounting surface 5301 of the reducer housing 530. The second portion 5212 includes a connecting hole 5205, which is used to connect the two sides of the second portion 5212, so that the second internal flow channel 5103 located in the motor housing 510 and the internal flow channel 5302 of the reducer housing 530 can be connected through the connecting hole 5205 of the second portion 5212, so that the second internal flow channel 5103 can be connected through the connecting hole 5205 of the second portion 5212. The oil in 03 can be fed into the internal flow channel 5302 of the reducer housing 530, thereby enabling the internal flow channel 5302 of the reducer housing 530 to deliver oil to the internal flow channel 5206 of the partition plate 520. The oil is then delivered to the second oil outlet 5203 through the internal flow channel 5206 of the partition plate 520, so that the oil received by the heat exchanger 600 in the second internal flow channel 5103 can be delivered to the internal flow channel 5206 of the partition plate 520 through the internal flow channel 5302 of the reducer housing 530.

[0122] In this embodiment, the connecting hole 5205 located in the second part 5212 only needs to enable communication between the second internal flow channel 5103 and the internal flow channel 5302 of the reducer housing 530. This allows the axial dimension of the second part 5212 of the partition plate 520 to be smaller, thereby reducing the axial dimension of the housing 500 occupied by the partition plate 520. This facilitates the delivery of oil to the internal flow channel 5206 of the partition plate 520 to cool the rotor 102 when the axial dimension of the partition plate 520 is smaller.

[0123] In one embodiment, such as Figure 4 and Figure 11As shown, the connecting hole 5205 penetrates the second part 5212 of the partition plate 520 along the axial direction O of the drive motor 100, minimizing the oil passage length of the connecting hole 5205. This allows the oil output from the second internal flow channel 5103 to enter the internal flow channel 5302 of the reducer housing 530 more quickly, and thus reach the internal flow channel 5206 and the second oil outlet 5203 of the partition plate 520 more quickly. This improves the efficiency of the oil output from the second oil outlet 5203 in cooling the other side 1022 of the rotor 102 of the drive motor 100, thereby improving the cooling efficiency of the drive motor 100. It also allows for a smaller axial dimension of the second part 5212 of the partition plate 520, which in turn reduces the axial dimension of the housing 500 of the planetary coaxial powertrain 10, contributing to the miniaturization of the planetary coaxial powertrain 10.

[0124] In one embodiment, such as Figure 6 As shown, the outlet 5109 of the second internal flow channel 5103 is located on the mounting surface 5101 of the motor housing 510. The outlet 5109 of the second internal flow channel 5103 is used to output the oil received from the heat exchanger 600, such as... Figure 10 As shown, the inlet 5310 of the internal flow channel 5302 of the reducer housing 530 is distributed on the mounting surface 5301 of the reducer housing 530, as... Figure 11 As shown, the inlet 5310 of the internal flow channel 5302 of the reducer housing 530 is used to receive the oil output from the outlet 5109 of the second internal flow channel 5103, such as... Figure 4 As shown, the extension direction of the second internal flow channel 5103 is parallel to the axial direction O of the drive motor 100, and the distance between the internal flow channel 5302 of the reducer housing 530 and the axis N of the drive motor 100 gradually decreases in the direction away from the drive motor 100.

[0125] In the embodiments of this application, such as Figure 11 As shown, the outlet 5109 of the second internal flow channel 5103 is located on the mounting surface 5101 of the motor housing 510, allowing the oil in the second internal flow channel 5103 of the motor housing 510 to be discharged from the motor housing 510 through the outlet 5109. The inlet 5310 of the internal flow channel 5302 of the reducer housing 530 is located on the mounting surface 5301 of the reducer housing 530. The inlet 5310 of the internal flow channel 5302 of the reducer housing 530 is used to receive the oil discharged from the outlet 5109 of the second internal flow channel 5103, so that the inlet of the internal flow channel 5302 of the reducer housing 530 does not need to be arranged on the outside of the reducer housing 530, which helps to save external connection pipes.

[0126] In this embodiment, the outlet 5109 of the second internal flow channel 5103 is distributed on the mounting surface 5101 of the motor housing 510, and the inlet 5310 of the internal flow channel 5302 of the reducer housing 530 is distributed on the mounting surface 5301 of the reducer housing 530. This allows the connection between the second internal flow channel 5103 and the internal flow channel 5302 of the reducer housing 530 to be directly achieved through the oil circuit of the housing 500 of the planetary coaxial power assembly 10, without the need for additional external pipes, which helps to save space.

[0127] In the embodiments of this application, such as Figure 4 As shown, the extension direction of the second internal flow channel 5103 is parallel to the axial direction O of the drive motor 100, which makes the length of the second internal flow channel 5103 of the motor housing 510 shorter. This allows the second internal flow channel 5103 of the motor housing 510 to deliver the oil output from the heat exchanger 600 to the outlet 5109 of the second internal flow channel 5103 more quickly. This increases the speed at which the oil output from the outlet 5109 of the second internal flow channel 5103 to the internal flow channel 5302 of the reducer housing 530. Consequently, the internal flow channel 5302 of the reducer housing 530 can deliver the oil to the second oil outlet 5203 more quickly through the internal flow channel 5206 of the partition plate 520. This improves the efficiency of the oil output from the second oil outlet 5203 for cooling the other side 1022 of the rotor 102 of the drive motor 100.

[0128] In this embodiment, the distance between the internal flow channel 5302 of the reducer housing 530 and the axis N of the drive motor 100 gradually decreases in the direction away from the drive motor 100, so that the oil entering the internal flow channel 5302 of the reducer housing 530 from the inlet 5310 can flow under the action of gravity, which helps to reduce oil resistance and reduce oil power loss.

[0129] In one embodiment, such as Figure 11 As shown, the two openings of the connecting hole 5205 in the second part 5212 are respectively connected to the outlet 5109 of the second internal flow channel 5103 and the inlet 5310 of the internal flow channel 5302 of the reducer housing 530. This allows the oil output from the heat exchanger 600 to flow sequentially through the heat exchanger oil inlet hole 5105, the second internal flow channel 5103, the outlet 5109 of the second internal flow channel 5103, the connecting hole 5205, and the inlet 5310 of the internal flow channel 5302 of the reducer housing 530 before entering the internal flow channel 5302 of the reducer housing 530.

[0130] In one embodiment, such as Figure 10As shown, the internal flow channels 5302 of the reducer housing 530 include a third internal flow channel 5303 and a fourth internal flow channel 5304. The distance between the third internal flow channel 5303 and the axis N of the drive motor 100 is greater than the distance between the fourth internal flow channel 5304 and the axis N of the drive motor 100. The inlet 5311 of the third internal flow channel 5303 is distributed on the mounting surface 5301 of the reducer housing 530, as shown. Figure 10 and Figure 11 As shown, the fourth internal flow channel 5304 and the internal flow channel 5206 of the partition plate 520 are used to receive oil from the third internal flow channel 5303.

[0131] In this embodiment, the internal flow channel 5302 of the reducer housing 530 includes a third internal flow channel 5303 and a fourth internal flow channel 5304. The distance between the third internal flow channel 5303 and the axis N of the drive motor 100 is greater than the distance between the fourth internal flow channel 5304 and the axis N of the drive motor 100. This allows the internal flow channel 5302 of the reducer housing 530 to be divided into two segments, the third internal flow channel 5303 and the fourth internal flow channel 5304, which are located at different positions. This allows the third internal flow channel 5303 and the fourth internal flow channel 5304 of the reducer housing 530 to be processed or molded separately. Compared with the entire internal flow channel 5302 of the reducer housing 530, the third internal flow channel 5303 and the fourth internal flow channel 5304 are shorter, which is beneficial to simplify the processing technology, reduce the difficulty of oil circuit manufacturing, and reduce the oil circuit manufacturing cost.

[0132] In the embodiments of this application, such as Figure 10 and Figure 11 As shown, the inlet 5311 of the third internal flow channel 5303 is located on the mounting surface 5301 of the reducer housing 530, allowing the third internal flow channel 5303 to be formed by drafting from the mounting surface 5301 of the reducer housing 530. This also allows the third internal flow channel 5303 to receive oil from the second internal flow channel 5103 of the motor housing 510. The fourth internal flow channel 5304 and the internal flow channel 5206 of the partition plate 520 are used to receive oil from the third internal flow channel 5303, allowing the oil entering the internal flow channel 5302 of the reducer housing 5303 from the third internal flow channel 5303 to be diverted into the fourth internal flow channel 5304 and the internal flow channel 5206 of the partition plate 520, respectively. Figure 4As shown, the oil in the internal flow channel 5302 of the reducer housing 530 can be delivered to the second oil outlet 5203 through the internal flow channel 5206 of the partition plate 520. The oil is then output through the second oil outlet 5203 to the other side 1022 of the rotor 102 of the drive motor 100 in the motor cavity 510a to cool the rotor 102 of the drive motor 100. The oil can also be input into the reducer cavity 530a through the fourth internal flow channel 5304 to cool and lubricate the planetary reducer 200 or the differential 400. This allows the planetary reducer 200 or the differential 400 to be actively lubricated directly through the internal flow channel 5302 of the reducer housing 530, which is beneficial to improving the lubrication efficiency of the planetary reducer 200 and the differential 400.

[0133] In one embodiment, such as Figure 10 As shown, the reducer housing 530 also includes a first opening 5312, which is used to connect to the fourth internal flow channel 5304, such as... Figure 6 As shown, the first opening 5312 is used to accommodate the sealing component 5313. The opening of the first opening 5312 is away from the reducer cavity 530a, so that the fourth internal flow channel 5304 can be directly formed from the first opening 5312 to the outside of the reducer housing 530, reducing the difficulty of forming the internal flow channel 5302 of the reducer housing 530 and reducing the manufacturing cost of the oil circuit.

[0134] In one embodiment, such as Figure 6 and Figure 8 As shown, the side 5202 of the partition plate 520 facing the reducer housing 530 includes a third bearing groove 5213 and a third oil outlet 5204, as... Figure 10 As shown, the inner wall of the reducer housing 530 facing the partition plate 520 includes a fourth bearing groove 5314 and a fourth oil outlet 5305. A third oil outlet 5204 is located at the bottom 5214 of the third bearing groove 5213, and a fourth oil outlet 5305 is located at the bottom 5315 of the fourth bearing groove 5314. The third bearing groove 5213 and the fourth bearing groove 5314 are respectively used to fix the two bearings 205 of the planetary carrier 201 in the planetary reducer 200. Figure 4 and Figure 8 As shown, the third oil outlet 5204 and the fourth oil outlet 5305 are used to output oil lubrication for the bearings 205 of the planetary carrier 201 in the planetary reducer 200. Specifically, the third oil outlet 5204 receives oil transmitted through the third internal flow channel 5303 via the internal flow channel 5206 of the partition plate 520, and the fourth oil outlet 5305 receives oil transmitted through the third internal flow channel 5303 via the fourth internal flow channel 5304.

[0135] In the embodiments of this application, such as Figure 8As shown, the side 5202 of the partition plate 520 facing the reducer housing 530 includes a third bearing groove 5213 and a third oil outlet 5204. The third oil outlet 5204 is distributed at the bottom 5214 of the third bearing groove 5213. The third bearing groove 5213 is used to fix the bearing 205a of the planetary carrier 201 in the planetary reducer 200. The third oil outlet 5204 is used to receive the oil transmitted by the third internal flow channel 5303 through the internal flow channel 5206 of the partition plate 520, so that the third oil outlet 5204 can receive the oil from the internal flow channel 5206 of the partition plate 520 and output it to the bearing 205a of the planetary carrier 201, thereby directly lubricating the bearing 205a of the planetary carrier 201, which is beneficial to improving the lubrication efficiency of the planetary reducer 200.

[0136] In the embodiments of this application, such as Figure 4 and Figure 10 As shown, the inner wall of the reducer housing 530 facing the partition plate 520 includes a fourth bearing groove 5314 and a fourth oil outlet 5305. The fourth oil outlet 5305 is distributed at the bottom 5315 of the fourth bearing groove 5314. The fourth oil outlet 5305 is used to receive oil transmitted from the third internal flow channel 5303 through the fourth internal flow channel 5304, so that the fourth oil outlet 5305 can receive oil from the fourth internal flow channel 5304 and output it to the bearing 205b of the planetary carrier 201, thereby directly lubricating the bearing 205b of the planetary carrier 201, which is beneficial to improving the lubrication efficiency of the planetary reducer 200.

[0137] In one embodiment, such as Figure 4 and Figure 10 As shown, the distance between the position where the internal flow channel 5206 of the partition plate 520 connects with the third internal flow channel 5303 and the axis N of the drive motor 100 is greater than the distance between the position where the fourth internal flow channel 5304 connects with the third internal flow channel 5303 and the axis N of the drive motor 100.

[0138] In the embodiments of this application, such as Figure 4 and Figure 10As shown, the distance between the position where the internal flow channel 5206 of the partition plate 520 connects with the third internal flow channel 5303 and the axis N of the drive motor 100 is denoted as L1. The distance between the position where the fourth internal flow channel 5304 connects with the third internal flow channel 5303 and the axis N of the drive motor 100 is denoted as L2. L1 > L2. The larger L1 allows the position where the internal flow channel 5206 of the partition plate 520 connects with the third internal flow channel 5303 to be closer to the mounting surface 5301 of the reducer housing 530. This facilitates the faster input of oil entering the third internal flow channel 5303 into the internal flow channel 5206 of the partition plate 520. As a result, the oil in the internal flow channel 5206 of the partition plate 520 can be output more quickly from the second oil outlet 5203 to the other side 1022 of the rotor 102 of the drive motor 100 to cool down the rotor 102 of the drive motor 100. The smaller L2 allows the oil in the third internal flow channel 5303 to be transported to the fourth internal flow channel 5304 by gravity, which helps to reduce oil resistance and reduce oil power loss.

[0139] In one embodiment, such as Figure 10 As shown, the inner wall of the reducer housing 530 includes a mounting groove 5316, a fifth oil outlet 5306, and a sixth oil outlet 5307. The mounting groove 5316 is used to mount the gear ring 202 of the planetary reducer 200. The fifth oil outlet 5306 and the sixth oil outlet 5307 are arranged on both sides of the mounting groove 5316 along the axial direction O of the drive motor 100. The fifth oil outlet 5306 is located on the side of the mounting groove 5316 facing the drive motor 100. The fifth oil outlet 5306 is used to directly connect to the third internal flow channel 5303 to receive oil, such as... Figure 10 and Figure 11 As shown, the inlet 5211 of the internal flow channel 5206 of the partition plate 520 is used to receive oil output from the fifth oil outlet 5306. The sixth oil outlet 5307 is located on the side of the mounting groove 5316 opposite to the drive motor 100. The sixth oil outlet 5307 is used to directly connect to the fourth internal flow channel 5304 to receive oil, as shown... Figure 4 As shown, the oil output from the sixth oil outlet 5307 is used to lubricate at least one of the planetary reducer 200 or the differential 400. The distance between the fifth oil outlet 5306 and the axis N of the drive motor 100 along the radial direction R of the drive motor 100 is greater than the distance between the sixth oil outlet 5307 and the axis N of the drive motor 100.

[0140] In this embodiment, the fifth oil outlet 5306 is located on the side of the mounting groove 5316 facing the drive motor 100. The fifth oil outlet 5306 is used to directly connect to the third internal flow channel 5303 to receive oil. The inlet 5211 of the internal flow channel 5206 of the partition plate 520 is used to receive the oil output from the fifth oil outlet 5306, making the fifth oil outlet 5306 closer to the slot 5308 of the reducer housing 530, so that the oil input into the third internal flow channel 5303 can be... The oil is delivered to the fifth oil outlet 5306 more quickly via a shorter path, allowing the inlet 5211 of the internal flow channel 5206 of the partition plate 520 to receive the oil output from the fifth oil outlet 5306 more quickly. This facilitates the internal flow channel 5206 of the partition plate 520 to deliver the oil to the second oil outlet 5203 more quickly, and from the second oil outlet 5203, the oil is output to the other side 1022 of the rotor 102 of the drive motor 100 to cool down the rotor 102 of the drive motor 100.

[0141] In this embodiment, the sixth oil outlet 5307 is distributed on the side of the mounting groove 5316 away from the drive motor 100. The sixth oil outlet 5307 is used to directly connect to the fourth internal flow channel 5304 to receive oil. The oil output from the sixth oil outlet 5307 is used to lubricate at least one of the planetary reducer 200 or the differential 400, so that oil can be directly delivered to lubricate the planetary reducer 200 and the differential 400 through the fourth internal flow channel 5304 and the sixth oil outlet 5307 of the reducer housing 530, thereby realizing active lubrication of the planetary reducer 200 and the differential 400 and improving the lubrication efficiency of the planetary reducer 200 and the differential 400.

[0142] In the embodiments of this application, such as Figure 10 As shown, the distance between the fifth oil outlet 5306 along the radial direction R of the drive motor 100 and the axis N of the drive motor 100 is greater than the distance between the sixth oil outlet 5307 and the axis N of the drive motor 100. The larger distance between the fifth oil outlet 5306 and the axis N of the drive motor 100 allows the fifth oil outlet 5306 to connect to the third internal flow channel 5303, which is farther away along the radial direction R of the drive motor 100 and the axis N of the drive motor 100. The smaller distance between the sixth oil outlet 5307 and the axis N of the drive motor 100 allows the sixth oil outlet 5307 to connect to the fourth internal flow channel 5304, which is closer along the radial direction R of the drive motor 100 and the axis N of the drive motor 100.

[0143] Figure 12 This is a cross-sectional view of the planetary reducer 200 provided in an embodiment of this application.

[0144] In one embodiment, such as Figure 4 , Figure 10 and Figure 12As shown, the planetary carrier 201 of the planetary reducer 200 is used to fix the oil collection tray 206. Along the axial direction of the drive motor 100, the oil collection tray 206 is arranged between the planetary carrier 201 and the sixth oil outlet 5307. The oil collection tray 206 is used to receive the oil output from the sixth oil outlet 5307. The oil collection tray 206 includes multiple protrusions 2060. The multiple protrusions 2060 are used to fix the planetary shaft 203 fixed by the planetary carrier 201 in the shaft hole 2030. The internal flow channels of the multiple protrusions 2060 are used to input the oil received by the oil collection tray 206 into the shaft hole 2030 of the planetary shaft 203. The oil is output to the planetary gear bearing 207 fixed by the planetary shaft 203 through the radial hole 2031 of the planetary shaft 203, which is connected to the shaft hole 2030 of the planetary shaft 203, to lubricate the planetary gear bearing, thereby realizing active lubrication of the planetary gear bearing, which is beneficial to improving the cooling and lubrication effect of the planetary reducer 200.

[0145] In one embodiment, such as Figure 4 and Figure 10 As shown, the reducer housing 530 also includes a second opening 5317. The second opening 5317 is used to connect to the fourth internal flow channel 5304 and to accommodate a sealing member 5318. The opening of the second opening 5317 faces away from the reducer cavity 530a. The second opening 5317 is used to connect to the sixth oil outlet 5307a. The sixth oil outlet 5307a is used to receive oil output from the fourth internal flow channel 5304 through the second opening 5317 and to output oil to cool the differential 400. The diameter of the second opening 5317 is larger than the diameter of the fourth internal flow channel 5304, and the diameter of the second opening 5317 is larger than the diameter of the sixth oil outlet 5307a.

[0146] In this embodiment, the diameter of the second opening 5317 is larger than the diameter of the sixth oil outlet 5307a and the diameter of the fourth internal flow channel 5304, so that the oil in the fourth internal flow channel 5304 of the reducer housing 530 can be temporarily stored at the second opening 5317. When the oil passes through the smaller diameter sixth oil outlet 5307a, the oil can be sprayed out faster, so that the oil output from the sixth oil outlet 5307a has more power and is more convenient to be sprayed onto the differential 400.

[0147] In one embodiment, such as Figure 3 and Figure 6As shown, the motor housing 510 includes a filter tank 5110, an oil pump tank 5111, and a heat exchanger oil outlet 5112. The filter tank 5110 is used to install the oil filter 800 of the planetary coaxial powertrain 10. The oil pump tank 5111 is used to install the oil pump 700 of the planetary coaxial powertrain 10. The oil filter 800 is used to filter the oil output by the oil pump 700 of the planetary coaxial powertrain 10. The heat exchanger oil outlet 5112 is used to supply the oil output by the oil filter 800 to the heat exchanger 600. The slot opening 5113 of the filter tank 5110 faces the partition plate 520. The partition plate 520 is used to enclose the slot 5113 of the filter tank 5110. The connecting pipe 5114 between the filter tank 5110 and the oil outlet 5112 of the heat exchanger is distributed along the axial direction O of the drive motor 100. The extension direction of the connecting pipe 5115 between the oil pump tank 5111 and the filter tank 5110 is perpendicular to the extension direction of the connecting pipe 5114 between the filter tank 5110 and the oil outlet 5112 of the heat exchanger. The extension direction of the oil outlet 5112 of the heat exchanger is perpendicular to the extension direction of the connecting pipe 5114 between the filter tank 5110 and the oil outlet 5112 of the heat exchanger.

[0148] In this embodiment, the filter tank 5110 is used to install the oil filter 800 of the planetary coaxial powertrain 10. The opening 5113 of the filter tank 5110 faces the partition plate 520. The partition plate 520 is used to enclose the opening 5113 of the filter tank 5110, so that the partition plate 520 can be directly used as the cover plate of the filter tank 5110. This is beneficial to simplify the structure of the housing 500 of the planetary coaxial powertrain 10, and also to save materials and reduce weight.

[0149] In the embodiments of this application, such as Figure 6 As shown, the connecting pipe 5114 between the filter tank 5110 and the oil outlet 5112 of the heat exchanger is distributed along the axial direction O of the drive motor 100. The extending direction of the connecting pipe 5115 between the oil pump tank 5111 and the filter tank 5110 is perpendicular to the extending direction of the connecting pipe 5114 between the filter tank 5110 and the oil outlet 5112 of the heat exchanger. This shortens the oil path from the oil pump tank 5111 and the filter tank 5110 into the oil outlet 5112 of the heat exchanger, thus shortening the path for the oil to enter the heat exchanger 600. Figure 4 and Figure 5 As shown, the heat exchanger 600 can output oil to the first internal flow channel 5102 and the second internal flow channel 5103 of the motor housing 510 more quickly, thereby delivering oil to the first oil outlet 5104 and the second oil outlet 5203 more quickly. The first oil outlet 5104 and the second oil outlet 5203 are used to cool one side 1021 and the other side of the rotor 102 of the drive motor 100, respectively, which is beneficial to improving the cooling efficiency of the rotor 102 of the drive motor 100.

[0150] In this embodiment, the connecting pipe 5114 between the filter tank 5110 and the oil outlet 5112 of the heat exchanger is distributed along the axial direction O of the drive motor 100. The extension direction of the oil outlet 5112 of the heat exchanger is perpendicular to the extension direction of the connecting pipe 5114 between the filter tank 5110 and the oil outlet 5112 of the heat exchanger, so that the oil outlet 5112 of the heat exchanger can protrude from the motor housing 510 away from the motor cavity 510a, thereby facilitating the fixed connection of the oil outlet 5112 of the heat exchanger 600 distributed on the outer peripheral wall of the motor housing 510.

[0151] In one embodiment, such as Figure 4 and Figure 7 As shown, the motor housing 510 includes a fifth bearing groove 5116 and a seventh oil outlet 5118. The fifth bearing groove 5116 is located on the outer wall 5119 of the motor housing 510 away from the partition plate 520. The fifth bearing groove 5116 is used to fix the outer ring of the bearing 204a of the drive shaft 204. The inner ring of the bearing 204a of the drive shaft 204 is used to fix one end 2041 of the drive shaft 204. The other end 2042 of the drive shaft 204 passes through the shaft cavity 1030 of the motor shaft 103 and extends into the reducer cavity 530a to drive and connect the differential 400. The seventh oil outlet 5118 is located at the bottom 5117 of the fifth bearing groove 5116. The seventh oil outlet 5118 is used to directly connect to the first internal flow channel 5102 and to output oil to lubricate the bearing 204a of the drive shaft 204. Figure 5 and Figure 9 As shown, the extension direction of the seventh oil outlet 5118 is perpendicular to the first internal flow channel 5102.

[0152] In this embodiment, the inner ring of the bearing 204a of the drive shaft 204 is used to fix one end 2041 of the drive shaft 204, and the other end 2042 of the drive shaft 204 passes through the shaft cavity 1030 of the motor shaft 103 and extends into the reducer cavity 530a to drive and connect the differential 400, so that the power received by the planetary reducer 200 by the differential 400 can be transmitted to the wheels 40 on both sides of the electric vehicle 1 through the drive shaft 204.

[0153] In this embodiment, the seventh oil outlet 5118 is located at the bottom 5117 of the fifth bearing groove 5116. The seventh oil outlet 5118 is used to directly connect to the first internal flow channel 5102. The seventh oil outlet 5118 is used to output oil to lubricate the bearing 204a of the fixed drive shaft 204, so that the bearing 204a of the drive shaft 204 can be directly lubricated through the oil passage of the housing 500 of the planetary coaxial power assembly 10, which is beneficial to improving the lubrication efficiency of the bearing 204a of the drive shaft 204. This also allows the oil in the first internal flow channel 5102 to not only be delivered to the first oil outlet 5104 for cooling the rotor 102 of the drive motor 100, but also to be output to the bearing 204a of the drive shaft 204 through the seventh oil outlet 5118 to lubricate the bearing 204a of the drive shaft 204. The first oil outlet 5104 and the seventh oil outlet 5118 share the same first internal flow channel 5102, which helps to simplify the oil circuit of the housing 500 of the planetary coaxial powertrain 10.

[0154] In this embodiment, the seventh oil outlet 5118 extends perpendicularly to the first internal flow channel 5102. The seventh oil outlet 5118 is distributed at the bottom 5117 of the fifth bearing groove 5116, which makes it easier for the seventh oil outlet 5118 to lubricate the bearing 204a of the drive shaft 204.

[0155] The planetary coaxial powertrain and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A planetary coaxial powertrain, characterized in that, The planetary coaxial powertrain housing includes a motor housing, a partition plate, and a reducer housing. The two sides of the partition plate respectively enclose the motor housing and the reducer housing to form a motor cavity and a reducer cavity. The motor cavity houses the stator and rotor of the drive motor, and the reducer cavity houses the planetary reducer and the differential. The drive motor drives the planetary reducer to drive the differential. The differential drives the wheels of the electric vehicle via a drive shaft. The drive shaft passes through the shaft cavity of the drive motor's motor shaft and is connected to the differential. Wherein: The motor housing includes a first oil outlet, which is distributed on the inner wall of the motor housing facing the partition plate. The first oil outlet is used to receive oil output from the heat exchanger of the planetary coaxial powertrain through the first internal flow channel of the motor housing. The oil output from the first oil outlet is used to cool one side of the rotor of the drive motor. The partition plate includes a second oil outlet, which is located on the side of the partition plate facing the motor housing. The second oil outlet is used to receive oil output from the heat exchanger of the planetary coaxial powertrain through the second internal flow channel of the motor housing. The oil output from the second oil outlet is used to cool the other side of the rotor of the drive motor.

2. The planetary coaxial powertrain according to claim 1, characterized in that, The first internal flow channel of the motor housing extends parallel to the radial direction of the drive motor, the second internal flow channel of the motor housing extends parallel to the axial direction of the drive motor, the first oil outlet extends parallel to the axial direction of the drive motor, the second oil outlet extends parallel to the axial direction of the drive motor, the flow direction of the oil in the first oil outlet is opposite to the flow direction of the oil in the second oil outlet, and the flow direction of the oil in the first oil outlet is the same as the flow direction of the oil in the second internal flow channel of the motor housing.

3. The planetary coaxial powertrain according to any one of claims 1-2, characterized in that, The motor housing includes a heat exchanger oil inlet for receiving oil output from the heat exchanger. The extension direction of the heat exchanger oil inlet is parallel to the radial direction of the drive motor and perpendicular to the extension direction of the second internal flow channel.

4. The planetary coaxial powertrain according to any one of claims 1-3, characterized in that, The motor housing includes a first bearing groove, which is distributed on the inner wall of the motor housing facing the partition plate. The partition plate includes a second bearing groove, which is distributed on the side of the partition plate facing the motor housing. The first bearing groove and the second bearing groove are used to fix two bearings of the motor shaft of the drive motor. The first oil outlet is distributed on the groove wall of the first bearing groove, and the second oil outlet is distributed on the groove wall of the second bearing groove.

5. The planetary coaxial powertrain according to any one of claims 1-4, characterized in that, The first oil outlet is used to directly connect to the first internal flow channel to receive the oil output by the heat exchanger through the first internal flow channel. The second oil outlet is used to directly connect to the internal flow channel of the middle partition to receive the oil. The internal flow channel of the middle partition is used to receive the oil output by the heat exchanger through the second internal flow channel through the internal flow channel of the reducer housing.

6. The planetary coaxial powertrain according to any one of claims 1-5, characterized in that, The first part of the partition plate is embedded in the slot of the reducer housing. The inlet of the internal flow channel of the partition plate is distributed on the outer peripheral surface of the first part. The inlet of the internal flow channel of the partition plate is used to receive the oil transmitted by the internal flow channel of the reducer housing directly from the oil outlet hole on the inner wall of the reducer housing. The internal flow channel of the partition plate is used to deliver oil to the second oil outlet hole.

7. The planetary coaxial powertrain according to any one of claims 1-6, characterized in that, The second part of the partition plate is arranged between the mounting surface of the motor housing and the mounting surface of the reducer housing. The side of the partition plate facing the motor housing is used to fit against the mounting surface of the motor housing, and the side of the partition plate facing the reducer housing is used to fit against the mounting surface of the reducer housing. The second part includes a connecting hole for connecting the two sides of the second part. The internal flow channel of the reducer housing is used to receive the oil output by the heat exchanger through the second internal flow channel through the connecting hole.

8. The planetary coaxial powertrain according to any one of claims 1-7, characterized in that, The outlet of the second internal flow channel is located on the mounting surface of the motor housing. The outlet of the second internal flow channel is used to output the oil received from the heat exchanger. The inlet of the internal flow channel of the reducer housing is located on the mounting surface of the reducer housing. The inlet of the internal flow channel of the reducer housing is used to receive the oil output from the outlet of the second internal flow channel. The extension direction of the second internal flow channel is parallel to the axial direction of the drive motor. The distance between the internal flow channel of the reducer housing and the axis of the drive motor gradually decreases in the direction away from the drive motor.

9. The planetary coaxial powertrain according to any one of claims 1-8, characterized in that, The internal flow channels of the reducer housing include a third internal flow channel and a fourth internal flow channel. The distance between the third internal flow channel and the axis of the drive motor is greater than the distance between the fourth internal flow channel and the axis of the drive motor. The inlet of the third internal flow channel is distributed on the mounting surface of the reducer housing. The fourth internal flow channel and the internal flow channel of the partition plate are used to receive oil from the third internal flow channel.

10. The planetary coaxial powertrain according to claim 9, characterized in that, The partition plate includes a third bearing groove and a third oil outlet on the side facing the reducer housing. The inner wall of the reducer housing facing the partition plate includes a fourth bearing groove and a fourth oil outlet. The third oil outlet is located at the bottom of the third bearing groove, and the fourth oil outlet is located at the bottom of the fourth bearing groove. The third and fourth bearing grooves are used to fix two bearings of the planetary carrier in the planetary reducer, respectively. The third and fourth oil outlets are used to output oil to lubricate the bearings of the planetary carrier in the planetary reducer, wherein: The third oil outlet is used to receive oil transmitted through the third internal flow channel through the internal flow channel of the partition plate, and the fourth oil outlet is used to receive oil transmitted through the third internal flow channel through the fourth internal flow channel.

11. The planetary coaxial powertrain according to any one of claims 9-10, characterized in that, The distance between the position where the internal flow channel of the partition plate connects to the third internal flow channel and the axis of the drive motor is greater than the distance between the position where the fourth internal flow channel connects to the third internal flow channel and the axis of the drive motor.

12. The planetary coaxial powertrain according to any one of claims 9-11, characterized in that, The inner wall of the reducer housing includes a mounting groove, a fifth oil outlet, and a sixth oil outlet. The mounting groove is used to mount the gear ring of the planetary reducer. The fifth and sixth oil outlets are arranged on both sides of the mounting groove along the axial direction of the drive motor. The fifth oil outlet is located on the side of the mounting groove facing the drive motor. The fifth oil outlet is used to directly connect to the third internal flow channel to receive oil. The inlet of the internal flow channel of the partition plate is used to receive oil output from the fifth oil outlet. The sixth oil outlet is located on the side of the mounting groove away from the drive motor. The sixth oil outlet is used to directly connect to the fourth internal flow channel to receive oil. The oil output from the sixth oil outlet is used to lubricate at least one of the planetary reducer or the differential. The distance between the fifth oil outlet and the axis of the drive motor along the radial direction of the drive motor is greater than the distance between the sixth oil outlet and the axis of the drive motor.

13. The planetary coaxial powertrain according to any one of claims 1-12, characterized in that, The motor housing includes a filter tank, an oil pump tank, and a heat exchanger oil outlet. The filter tank is used to install the oil filter of the planetary coaxial powertrain. The oil pump tank is used to install the oil pump of the planetary coaxial powertrain. The oil filter is used to filter the oil output by the oil pump of the planetary coaxial powertrain. The heat exchanger oil outlet is used to supply the oil output by the oil filter to the heat exchanger. The opening of the filter tank faces the partition plate, and the partition plate is used to enclose the opening of the filter tank. The connecting pipe between the filter tank and the heat exchanger oil outlet is distributed along the axial direction of the drive motor. The extension direction of the connecting pipe between the oil pump tank and the filter tank is perpendicular to the extension direction of the connecting pipe between the filter tank and the heat exchanger oil outlet. The extension direction of the heat exchanger oil outlet is perpendicular to the extension direction of the connecting pipe between the filter tank and the heat exchanger oil outlet.

14. The planetary coaxial powertrain according to any one of claims 1-13, characterized in that, The motor housing includes a fifth bearing groove and a seventh oil outlet. The fifth bearing groove is located on the outer wall of the motor housing away from the middle partition. The fifth bearing groove is used to fix the outer ring of the bearing of the drive shaft. The inner ring of the bearing of the drive shaft is used to fix one end of the drive shaft. The other end of the drive shaft passes through the shaft cavity of the motor shaft and extends into the reducer cavity to drive and connect to the differential. The seventh oil outlet is located at the bottom of the fifth bearing groove. The seventh oil outlet is used to directly connect to the first internal flow channel. The seventh oil outlet is used to output oil to lubricate and fix the bearing of the drive shaft. The extension direction of the seventh oil outlet is perpendicular to the first internal flow channel.

15. An electric vehicle, characterized in that, The electric vehicle includes wheels and a planetary coaxial powertrain as described in any one of claims 1-14, the planetary coaxial powertrain being used to drive the wheels.

Images