Power assembly and vehicle

Abstract

The invention provides a power assembly and a vehicle. The power assembly comprises a shell, a partition plate, a motor, a first liquid return channel and a second liquid return channel, and the partition plate divides the interior of the shell into a first cavity and a second cavity; the motor is located in the first cavity and comprises a motor shaft, and the motor shaft penetrates through the partition plate and extends into the second cavity; the first liquid return channel is located on the outer side of the shell, communicates with the first cavity and the second cavity and is used for conveying liquid in the first cavity into the second cavity. The second liquid return channel is located on the outer side of the shell, communicates with the first cavity and the second cavity and is used for conveying liquid in the first cavity into the second cavity, and the second liquid return channel and the first liquid return channel are overlapped at most in the circumferential direction of the motor shaft. According to the power assembly, the two liquid return channels are arranged, the liquid return requirement can be met when the power assembly is installed and arranged at any angle or used on a slope, and the adaptability and safety of the power assembly are improved.

Description

[0001] This application is a divisional application. The application number of the original application is 202210995005.7, and the original application date is August 18, 2022. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of motor technology, and in particular to a powertrain and a vehicle. Background Art

[0003] The motor in the electric drive assembly is a key component of electromechanical energy conversion. In the process of electromechanical energy conversion, there are various losses. Most of these losses are dissipated in the form of heat, causing the temperature of the motor body to rise. When the temperature rises to a certain level, the key components such as the winding, insulation, and bearings inside the motor will be burned by high temperature. In the prior art, a cooling oil channel is set on the outside or inside of the motor housing to dissipate the heat of the motor, but the cooling oil in the oil channel on the inside will enter the air gap of the motor and affect the performance of the motor; the oil channel on the outside, when the electric drive assembly is completed, the position of the oil channel is determined. In order to meet the oil channel circulation requirements and not immerse in the air gap, the installation angle of the electric drive assembly on the vehicle can only be changed within a very small range, which cannot meet the requirements of adapting to different models and flexible layout. Summary of the invention

[0004] The present application provides a powertrain that can be flexibly adapted to different vehicle models by setting two liquid return passages, and a vehicle including the powertrain.

[0005] In a first aspect, the present application provides a power assembly, which includes a shell, a partition, a motor, a first liquid return channel and a second liquid return channel, wherein the partition divides the interior of the shell into a first cavity and a second cavity; the motor is located in the first cavity, and the motor includes a motor shaft, and the motor shaft passes through the partition and extends into the second cavity; the first liquid return channel is located on the outside of the shell and is connected to the first cavity and the second cavity, and is used to transport the liquid in the first cavity to the second cavity; the second liquid return channel is located on the outside of the shell and is connected to the first cavity and the second cavity, and is used to transport the liquid in the first cavity to the second cavity, and the second liquid return channel overlaps with the first liquid return channel at most partially in the circumferential direction of the motor shaft.

[0006] In the present application, a first liquid return channel and a second liquid return channel are provided, and the first liquid return channel and the second liquid return channel are located at different positions of the shell, and the two liquid return channels are used together to transport the liquid in the first cavity to the second cavity. On the one hand, after the powertrain is installed in the vehicle, when the environment of the vehicle changes, for example, when the tilt angle of the vehicle increases, the two liquid return channels can ensure that the liquid in the first cavity is smoothly discharged into the second cavity, and the liquid level in the first cavity is maintained below the preset liquid level, so that the efficiency of the motor is improved; on the other hand, when the powertrain is installed in different vehicles, the installation position or installation angle of the powertrain changes, and the provision of the two liquid return channels can enhance the adaptability of the powertrain, so that the powertrain can be flexibly arranged on the vehicle; on the third hand, the production line test process corresponding to the powertrain is carried out according to the powertrain on the vehicle The design is based on the layout of the vehicle. The two return liquid channels are set to meet the drainage requirements of the first cavity, so that one production line can be compatible with multiple models of vehicles and reduce the cost of the test production line. Fourthly, the liquid level in the first cavity is relatively high. When the first return liquid channel and the second return liquid channel are both below the liquid level, the liquid in the first cavity is discharged through the two return liquid channels at the same time, so that the liquid in the first cavity can be discharged faster. When one of the return liquid channels is blocked, the other return liquid channel can continue to work to prevent liquid from accumulating in the first cavity, thereby improving the cooling effect and ensuring the heat dissipation performance of the powertrain.

[0007] After the powertrain is installed, if the vehicle is on a smooth road, if the first liquid return channel is located at the lower point of the first cavity along the direction of gravity, the liquid in the first cavity is transported to the second cavity through the first liquid return channel. When the vehicle travels to a relatively extreme slope, after the powertrain reaches a certain inclination angle, the height of the first liquid return channel in the direction of gravity increases, and the second liquid return channel is located at the lower point of the first cavity along the direction of gravity. The liquid in the first cavity is transported to the second cavity through the second liquid return channel. When the position of the powertrain changes, the two liquid return channels can ensure that the liquid in the first cavity is smoothly transported to the second cavity. At the same time, when the powertrain is installed on different models, the installation angle changes. The setting of the two liquid return channels can also enable the first cavity to meet the discharge requirements, so that the powertrain can be adapted to different models and meet the requirements of flexible layout of the powertrain. Correspondingly, the vehicle production line can also be compatible with a variety of models, reducing the cost of the test production line.

[0008] In this application, the housing isolates the motor and reducer from the external environment. On the one hand, the housing can be used to protect the powertrain and prevent the motor and reducer from colliding with the external environment and being damaged. On the other hand, the powertrain will vibrate during use. The setting of the housing can reduce the vibration generated by the powertrain during use, prevent the powertrain from causing damage to other parts of the vehicle, and reduce the noise generated by the powertrain. The partition separates the first cavity and the second cavity. The partition and the housing limit the motor to the first cavity. The motor can generate driving torque and serve as the power source of the powertrain.

[0009] In one possible implementation, the liquid in the first cavity and the second cavity is cooling lubricant, which is used to cool the motor to prevent the motor from being damaged due to excessive temperature, thereby causing failure of the powertrain. At the same time, the cooling lubricant can be used to lubricate the motor shaft to prevent wear between the motor shaft and other components. In other embodiments, the liquid in the first cavity and the second cavity can also be water, a water-oil mixture, or other media, which is not specifically limited in this application. In one embodiment, the powertrain also includes an oil pump and an oil cooler, and the oil pump is used to drive the cooling lubricant to circulate between the first cavity and the second cavity. When the cooling lubricant flows through the motor, it can take away the heat generated by the motor when it is working. The higher temperature cooling lubricant is cooled when passing through the oil cooler and continues to be used to cool the motor.

[0010] The first liquid return channel and the second liquid return channel are both fixedly connected to the shell and are located outside the first cavity and the second cavity. The first liquid return channel and the second liquid return channel have a receiving space inside for liquid to pass through. The liquid in the first cavity flows into the second cavity through the first liquid return channel, or the liquid in the first cavity flows into the second cavity through the second liquid return channel, or the liquid in the first cavity flows into the second cavity through the first liquid return channel and the second liquid return channel at the same time. When the powertrain is in use or the powertrain is installed in different vehicles, the relative positions of the first liquid return channel and the second liquid return channel and the motor in the direction of gravity will change. The direction of gravity is the vertical downward direction, and the direction of gravity is perpendicular to the horizontal direction.

[0011] In one possible implementation, in the initial state, when the power assembly is placed vertically, the first liquid return channel is located below the liquid surface of the first cavity in the direction of gravity, and the second liquid return channel is located above the liquid surface of the first cavity in the direction of gravity. The liquid in the first cavity flows to the second cavity through the first liquid return channel. At a certain moment, the relative positions of the first liquid return channel, the second liquid return channel and the motor in the direction of gravity will change. For example, when the power assembly is placed horizontally, the first liquid return channel is located above the liquid surface of the first cavity in the direction of gravity, and the second liquid return channel is located below the liquid surface of the first cavity in the direction of gravity. At this time, the liquid in the first cavity flows to the second cavity through the second liquid return channel.

[0012] In one possible implementation, the power assembly is installed on a vehicle. When the vehicle is on horizontal ground, at least parts of the first liquid return channel and the second liquid return channel are both located below the liquid level of the first cavity. At this time, the liquid in the first cavity is discharged into the second cavity through the first liquid return channel and the second liquid return channel at the same time; when the vehicle goes uphill so that the height of the second liquid return channel increases to above the liquid level of the first cavity and the first liquid return channel is still located below the liquid level, the liquid in the first cavity is discharged into the second cavity through the first liquid return channel at the same time; when the vehicle goes downhill so that the height of the first liquid return channel increases to above the liquid level of the first cavity and the second liquid return channel is located below the liquid level, the liquid in the first cavity is discharged into the second cavity through the second liquid return channel at the same time.

[0013] In one possible implementation, the oil pump drives the liquid in the first cavity into the return channel, and then drives the liquid in the return channel to the second cavity. After cooling by the oil cooler, the liquid is transported to a higher point in the first cavity in the direction of gravity. Under the action of gravity, the liquid flows through the motor and flows down to the return channel located at a lower point in the first cavity in the direction of gravity, and then continues to circulate. In other embodiments, if the flow direction of the liquid driven by the oil pump changes, the first return channel and the second return channel are used to transport the liquid in the second cavity to the first cavity, and the oil pump drives the liquid in the second cavity to flow into the return channel, and then drives the liquid in the return channel into the first cavity.

[0014] In one possible implementation, the power assembly includes more than two liquid return channels, which are all located on the outside of the shell and connected to the first cavity and the second cavity, and are used to transport the liquid in the first cavity to the second cavity. The two or more liquid return channels overlap at most partially in the circumferential direction of the motor shaft.

[0015] In a possible implementation, the second liquid return channel and the first liquid return channel are spaced apart in the circumferential direction of the motor shaft. The liquid in the first cavity can choose to flow into the lower liquid return channel according to the height of the second liquid return channel and the first liquid return channel in the direction of gravity. When the powertrain changes an angle and reaches a certain inclination angle, so that the height of the second liquid return channel and the first liquid return channel in the direction of gravity changes, the liquid in the first cavity can flow into another liquid return channel that is lower to the ground. When the powertrain is used in a vehicle, the second liquid return channel is spaced apart from the first liquid return channel. When the vehicle travels to a larger slope, the liquid in the first cavity can still be discharged smoothly, so that the vehicle can adapt to a larger slope.

[0016] In a possible implementation, in the axial direction of the motor shaft, at least part of the first liquid return channel and at least part of the second liquid return channel are located on the side of the partition facing the first cavity. In one embodiment, the first liquid return channel and the second liquid return channel are located on the side of the partition facing the first cavity, so that the liquid at one end of the first cavity away from the partition along the axial direction can flow into the second cavity through the first liquid return channel and the second liquid return channel. In one embodiment, one of the first liquid return channel and the second liquid return channel is located on the side of the partition facing the first cavity, and part of the other of the first liquid return channel and the second liquid return channel is located on the side of the partition facing the first cavity, and part of it is located on the side of the partition facing the second cavity. In one embodiment, part of the first liquid return channel and the second liquid return channel are located on the side of the partition facing the first cavity, and the other part is located on the side of the partition facing the second cavity. The positions of the first liquid return channel and the second liquid return channel can be determined according to the shape of the shell and the setting of the flow channel in the shell, and it can be ensured that the liquid in the first cavity is smoothly discharged into the second cavity.

[0017] In a possible implementation, the first liquid return channel and / or the second liquid return channel extend along the axial direction of the motor shaft. In one embodiment, both the first liquid return channel and the second liquid return channel extend along the axial direction of the motor shaft, and the lengths of the first liquid return channel and the second liquid return channel are relatively small, so that the liquid in the first cavity can flow into the second cavity after a relatively short distance, and the liquid discharge efficiency in the first cavity is high. In one embodiment, one of the first liquid return channel and the second liquid return channel extends along the axial direction of the motor shaft, and the extension direction of the other of the first liquid return channel and the second liquid return channel intersects with the axial direction of the motor shaft. In one embodiment, the extension direction of the first liquid return channel and the second liquid return channel intersects with the axial direction of the motor shaft.

[0018] In a possible implementation, in the circumferential direction of the motor shaft, the angle between the first connecting line between the first liquid return channel and the motor shaft and the second connecting line between the second liquid return channel and the motor shaft is less than or equal to 90°; the first connecting line is the connecting line between the midpoint of the first liquid return channel in the circumferential direction of the motor shaft and the motor shaft along the radial direction of the motor shaft, and the second connecting line is the connecting line between the midpoint of the second liquid return channel in the circumferential direction of the motor shaft and the motor shaft along the radial direction of the motor shaft. The angle between the first connecting line and the second connecting line is less than or equal to 90°, so that the first cavity can meet the requirement of smooth drainage when the power assembly is placed horizontally or vertically.

[0019] In a possible implementation, the motor includes a rotor, and the highest point of the internal receiving space of at least one of the first liquid return channel and the second liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor, and the lowest point of the outer surface of the rotor is the lowest point of the rotor in the direction of gravity when the power assembly is in use. When the highest point of the internal receiving space of at least one of the first liquid return channel and the second liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor, the highest position of the liquid level in the first cavity is equal to the highest point of the lower one of the first liquid return channel and the second liquid return channel, and when the lower one of the first liquid return channel and the second liquid return channel is filled with liquid, the liquid flows into the second cavity, thereby preventing the cooling liquid from soaking the air gap for a long time.

[0020] When the layout angle of the power assembly changes during use, the power assembly, at various layout angles, satisfies the requirement that the highest point of the internal containing space of at least one of the first liquid return channel and the second liquid return channel in the gravity direction is lower than the lowest point of the outer surface of the rotor, so that the liquid in the first cavity cannot fill the air gap, that is, the liquid in the first cavity cannot fill the partial air gap between the lowest point of the outer surface of the rotor and the lowest point of the inner surface of the stator, so as to ensure the working efficiency and reliability of the motor.

[0021] In a possible implementation, the highest point of the internal accommodation space of the first liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor. That is, at any time during the use of the power assembly, the highest point of the internal accommodation space of the first liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor. When the first liquid return channel is completely filled with liquid or partially filled, the liquid level of the liquid in the first liquid return channel is lower than the lowest point of the outer surface of the rotor. Even if only one first liquid return channel is used, the discharge requirements of the first cavity can be met, and it can also be ensured that the liquid in the first cavity does not fill the air gap.

[0022] In a possible implementation, the highest point of the internal accommodation space of the second liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor. That is, at any time during the use of the power assembly, the highest point of the internal accommodation space of the second liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor. When the second liquid return channel is completely filled with liquid or partially filled, the liquid level of the liquid in the second liquid return channel is lower than the lowest point of the outer surface of the rotor. Even if only one second liquid return channel is used, the discharge requirements of the first cavity can be met, and it can also be ensured that the liquid accumulated in the first cavity cannot fill the air gap, so as to ensure the working efficiency and reliability of the motor.

[0023] In a possible implementation, when the power assembly is placed vertically, the highest point of the internal accommodation space of the first liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor. When the power assembly is in use, the layout angle changes. For example, when the power assembly changes from vertical placement to horizontal placement, the highest point of the internal accommodation space of the second liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor. Both of the above embodiments can meet the requirements of cooling liquid return and ensure the cooling and heat dissipation effect of the power assembly.

[0024] In one possible implementation, the highest point of the internal containing space of at least one of the first liquid return channel and the second liquid return channel in the direction of gravity is lower than the lowest point of the air gap, that is, the highest point of the internal containing space of at least one of the first liquid return channel and the second liquid return channel in the direction of gravity is lower than the lowest point of the inner surface of the stator, so that liquid does not accumulate in the air gap, which can better ensure the working efficiency and reliability of the motor.

[0025] In one embodiment, the power assembly is applied to a vehicle. When the vehicle is placed horizontally, the power assembly is placed at an angle to the horizontal direction. At this time, the lowest points of the internal containing spaces of the first liquid return channel and the second liquid return channel in the direction of gravity are both lower than the lowest point of the outer surface of the rotor, and the highest points of the internal containing spaces of the first liquid return channel and the second liquid return channel in the direction of gravity may be higher than the lowest point of the outer surface of the rotor, and the liquid in the first cavity enters the second cavity through the first liquid return channel and the second liquid return channel at the same time; when the vehicle travels to a slope, when the height of the second liquid return channel in the direction of gravity increases, so that the highest point of the internal containing space of the first liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor, the liquid in the first cavity can enter the second cavity through the first liquid return channel; when the height of the first liquid return channel in the direction of gravity increases, so that the highest point of the internal containing space of the second liquid return channel in the direction of gravity is lower than the lowest point of the outer surface of the rotor, the liquid in the first cavity can enter the second cavity through the second liquid return channel.

[0026] When the powertrain is arranged at any angle on the vehicle, such as 0 to 90 degrees, the vehicle returns oil through the combination of the first and second return channels on a flat road; when going uphill or downhill, the vehicle returns oil through the combination of the two return channels or a single return channel. This arrangement allows the powertrain to fully utilize the first and second return channels for discharge, and the powertrain can be arranged at a wider angle on the vehicle to enhance the adaptability of the powertrain.

[0027] In one embodiment, when the amount of liquid discharged in the first cavity is large and two liquid return channels are required to work simultaneously for discharge, the highest points of the internal receiving spaces of the first liquid return channel and the second liquid return channel in the gravity direction can be set lower than the lowest point of the outer surface of the rotor.

[0028] In one possible implementation, the motor includes a rotor, and a first liquid level in the first liquid return channel and a second liquid level in the second liquid return channel are lower than a lowest point on an outer surface of the rotor, and the lowest point on the outer surface of the rotor is the lowest point in the direction of gravity when the powertrain is in use.

[0029] After the discharge volumes of the first and second return liquid channels are designed according to the required discharge volume of the first cavity, when the first and second return liquid channels are used together for discharge, the liquid volume does not fill the entire first and second return liquid channels. At this time, although the highest points of the first and second return liquid channels are higher than the lowest point of the outer surface of the rotor, the first liquid level in the first return liquid channel and the second liquid level in the second return liquid channel are lower than the lowest point of the outer surface of the rotor, so that the liquid in the first cavity cannot fill the air gap, so as to ensure the working efficiency and reliability of the motor; when the positional relationship between the first and second return liquid channels changes and only one return liquid channel is involved in the discharge, it is only necessary to ensure that the liquid level of the return liquid channel in use is lower than the lowest point of the outer surface of the rotor, so that the liquid in the first cavity cannot fill the air gap.

[0030] In a possible implementation, the power assembly also includes a reducer, which is located in the second cavity. The reducer includes an output shaft, and the output shaft is coupled to the motor shaft at one end of the second cavity; the output shaft and the motor shaft are arranged side by side along a first direction, and in the first direction, the first liquid return channel is located between the output shaft and the motor shaft, and the first direction intersects with the axial direction of the motor shaft.

[0031] In one embodiment, the output shaft is arranged in parallel with the motor shaft. In one embodiment, when the first direction is parallel to the direction of gravity, the power assembly is placed vertically, and when the first direction is perpendicular to the direction of gravity, the power assembly is placed horizontally. In one embodiment, when the power assembly is installed on a vehicle, the output shaft is located on the side of the motor shaft close to the ground along the direction of gravity, and the height of the first liquid return channel in the direction of gravity is lower than the height of the second liquid return channel in the direction of gravity.

[0032] In a possible implementation, the motor includes a first end face and a second end face arranged in the axial direction, the first end face is arranged farther away from the partition than the second end face, a first liquid collecting chamber is formed between the first end face and the shell, and the first liquid return channel and the second liquid return channel are connected to the first liquid collecting chamber, and are used to transport the liquid in the first liquid collecting chamber to the second cavity. Part of the liquid in the first cavity is concentrated in the first liquid collecting chamber, and the liquid in the first liquid collecting chamber is discharged by providing the first liquid return channel and the second liquid return channel, so that the liquid in the first cavity can be discharged in a concentrated manner, thereby increasing the drainage efficiency of the first cavity.

[0033] In a possible implementation, a first liquid outlet penetrating the shell is provided on the shell portion constituting the first liquid collecting chamber, a first liquid inlet is provided at one end of the first liquid return channel close to the first liquid collecting chamber, the first liquid outlet is connected to the first liquid inlet, the liquid in the first liquid collecting chamber enters the first liquid return channel through the first liquid outlet and the first liquid inlet in sequence, and in the circumferential direction of the motor shaft, the size of the first liquid outlet is greater than or equal to the size of the first liquid inlet. Setting the size of the first liquid outlet to be greater than or equal to the size of the first liquid inlet can better discharge the liquid in the first liquid collecting chamber into the first liquid return channel to prevent the liquid from accumulating in the first liquid collecting chamber.

[0034] In one possible implementation, a second liquid outlet penetrating the shell is provided on the shell portion constituting the first liquid collecting chamber, and a second liquid inlet is provided at one end of the second liquid return channel close to the first liquid collecting chamber, and the second liquid outlet is connected to the second liquid inlet. The liquid in the first liquid collecting chamber enters the second liquid return channel through the second liquid outlet and the second liquid inlet in sequence, and in the circumferential direction of the motor shaft, the size of the second liquid outlet is greater than or equal to the size of the second liquid inlet. Setting the size of the second liquid outlet to be greater than or equal to the size of the second liquid inlet can better discharge the liquid in the first liquid collecting chamber into the second liquid return channel to prevent the liquid from accumulating in the first liquid collecting chamber. In one embodiment, the size of the second liquid outlet may also be smaller than the size of the second liquid inlet.

[0035] In one possible implementation, a second liquid collecting chamber is formed between the second end surface and the partition, and a third liquid outlet is provided on the partition and passes through the partition. The third liquid outlet connects the second liquid collecting chamber and the second cavity, and is used to transport the liquid in the second liquid collecting chamber to the second cavity.

[0036] Part of the liquid in the first cavity is concentrated in the first liquid collecting chamber. By setting the third liquid outlet, the liquid in the second liquid collecting chamber is directly discharged to the second cavity. The liquid in the first cavity can be discharged in a concentrated manner, thereby increasing the drainage efficiency of the first cavity.

[0037] In a possible implementation, a fourth liquid inlet that penetrates the shell is provided on the shell located outside the second cavity, and a fourth liquid outlet is provided at one end of the first liquid return channel and the second liquid return channel axially close to the second cavity, and the fourth liquid inlet is connected to the fourth liquid outlet, and the liquid in the first liquid return channel and the second liquid return channel enters the second cavity through the fourth liquid outlet and the fourth liquid inlet in turn.

[0038] In a possible implementation, a fifth liquid inlet is further provided on the partition, and the fifth liquid inlet connects the first cavity and the second cavity. The fifth liquid inlet is located at a higher point of the partition along the gravity direction. After the liquid in the second cavity is cooled, it enters the first cavity through the fifth liquid inlet, and enters the air gap between the stator and the rotor from the holes on the peripheral wall of the motor shaft. The liquid flows from a higher point in the gravity direction to a lower point in the gravity direction to cool and lubricate the stator and rotor in the first cavity. The liquid in the first cavity continues to flow into the second cavity through the return liquid channel at a lower point in the gravity direction.

[0039] In a possible implementation, the motor shaft has a hollow structure. After being cooled, the liquid in the second cavity enters the first cavity from the motor shaft to cool and lubricate the stator and rotor in the first cavity.

[0040] In a possible implementation, in the circumferential direction of the motor shaft, at least part of the third liquid outlet overlaps with the first liquid return channel, and at least part of the third liquid outlet overlaps with the second liquid return channel; the highest point of the third liquid outlet is lower than the lowest point of the outer surface of the rotor, and the lowest point of the outer surface of the rotor is the lowest point of the rotor in the direction of gravity when the power assembly is in use.

[0041] A plurality of third liquid outlets are provided on the partition, some of the third liquid outlets are arranged close to the first liquid return channel, and the projection of the third liquid outlets when projected to the circumferential direction at least partially overlaps with the projection of the first liquid return channel when projected to the circumferential direction, and when the first liquid return channel is used to discharge the liquid in the first liquid collecting chamber, the third liquid outlets are used to discharge the liquid in the second liquid collecting chamber; some of the third liquid outlets are arranged close to the second liquid return channel, and the projection of the third liquid outlets when projected to the circumferential direction at least partially overlaps with the projection of the second liquid return channel when projected to the circumferential direction, and when the second liquid return channel is used to discharge the liquid in the first liquid collecting chamber, the third liquid outlets are used to discharge the liquid in the second liquid collecting chamber.

[0042] The highest point of the third liquid outlet is lower than the lowest point of the outer surface of the rotor, so that the liquid in the second liquid collecting chamber cannot fill the air gap, that is, the liquid in the second liquid collecting chamber cannot fill the partial air gap between the lowest point of the outer surface of the rotor and the lowest point of the inner surface of the stator, so as to ensure the working efficiency and reliability of the motor.

[0043] In a possible implementation, the third liquid outlet is in the shape of an elongated strip, and the third liquid outlet extends in the circumferential direction. This arrangement increases the area of ​​the third liquid outlet and facilitates liquid discharge. In other embodiments, the third liquid outlet may also be in the shape of a circle, an ellipse, a square, or an irregular shape.

[0044] In a second aspect, the present application provides a vehicle, comprising a vehicle body and a powertrain as described in any one of the above items, wherein the powertrain is mounted on the vehicle body.

[0045] In a possible implementation, the power assembly also includes a reducer, which is located in the second cavity, and the output shaft of the reducer and the motor shaft are arranged along a first direction, the angle between the first direction and the horizontal direction is a first angle, and the highest point of the internal accommodation space of the first liquid return channel and the second liquid return channel is determined according to the first angle, so that the liquid level of one or both of the liquids in the first liquid return channel and the second liquid return channel is lower than the lowest point of the outer surface of the rotor of the motor.

[0046] In one possible implementation, the highest climbing angle of the vehicle is the second angle, and the highest point of the internal containing space of the first liquid return channel and the second liquid return channel is determined according to the first angle and the second angle, so that the liquid level of one or both of the liquids in the first liquid return channel and the second liquid return channel is lower than the lowest point of the outer surface of the rotor of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0048] Figure 1 is a schematic diagram of a vehicle provided by the present application;

[0049] Figure 2 It is a structural schematic diagram of a powertrain provided by the present application;

[0050] Figure 3 is a three-dimensional diagram of a powertrain provided by the present application;

[0051] Figure 4 is a schematic diagram of a powertrain provided by the present application;

[0052] Figure 5 is a schematic diagram of a powertrain provided by the present application;

[0053] Figure 6 is a three-dimensional diagram of a powertrain provided by the present application;

[0054] Figure 7 is a schematic diagram of a powertrain provided by the present application;

[0055] Figure 8 is a schematic diagram of a powertrain provided by the present application;

[0056] Fig. 9 is a schematic diagram of a powertrain provided by the present application;

[0057] Fig.10 is a schematic diagram of a powertrain provided by the present application;

[0058] Fig.11 is a schematic diagram of a powertrain provided by the present application;

[0059] Fig.12 is a schematic diagram of a powertrain provided by the present application;

[0060] Fig.13 is a schematic diagram of a powertrain provided by the present application;

[0061] Fig.14 is a schematic diagram of a powertrain provided by the present application;

[0062] Fig.15 is a schematic diagram of a powertrain provided by the present application;

[0063] Fig.16 is a schematic diagram of a powertrain provided by the present application;

[0064] Fig.17 It is a schematic diagram of the partition and liquid return channel provided in this application. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0066] In this document, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0067] In addition, in this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the change of the orientation of the structure.

[0068] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0069] MCU: It is the abbreviation of Motor Control Unit, which refers to the motor controller.

[0070] The present application provides a powertrain, which includes a housing, a partition, a motor, a first liquid return channel and a second liquid return channel, wherein the partition divides the interior of the housing into a first cavity and a second cavity; the motor is located in the first cavity, and the motor includes a motor shaft, which extends into the second cavity through the partition; the first liquid return channel is located on the outside of the housing and is connected to the first cavity and the second cavity, and is used to transport the liquid in the first cavity to the second cavity; the second liquid return channel is located on the outside of the housing and is connected to the first cavity and the second cavity, and is used to transport the liquid in the first cavity to the second cavity, and the second liquid return channel overlaps with the first liquid return channel at most in the circumferential direction of the motor shaft. In the present application, by setting two liquid return channels, the liquid return requirements can be met when the powertrain is installed and arranged at any angle or used on a slope, thereby improving the adaptability and safety of the powertrain.

[0071] See also Figure 1 The present application provides a vehicle 1, and the powertrain 10 provided in the present application is applied to the vehicle 1. The vehicle 1 includes a vehicle body, and the powertrain 10 is installed on the vehicle body. The powertrain 10 is used to drive the vehicle body to travel. The powertrain 10, whose English name is Powertrain or Powerp l ant, generates power to provide power for the vehicle 1. The powertrain 10 includes a motor 300 and a reducer 600, wherein the motor 300 is used to generate power, and the reducer 600 is transmission-connected with the motor 300, and the reducer 600 is used to reduce the rotation speed and increase the torque.

[0072] In some embodiments, the motor 300 includes an asynchronous motor and a synchronous motor. The synchronous motor includes a permanent magnet synchronous motor, a reluctance synchronous motor, and a hysteresis synchronous motor; the asynchronous motor includes an induction motor and an AC commutator motor. In some embodiments, the induction motor can be divided into: a three-phase asynchronous motor, a single-phase asynchronous motor, and a shaded pole asynchronous motor. In some embodiments, the AC commutator motor can be divided into: a single-phase series motor, an AC / DC dual-purpose motor, and a repulsion motor.

[0073] In the present application, the motor 300 includes a motor shaft 310, a rotor 320 and a stator 330 (eg, Figure 2 As shown), the rotor 320 is sleeved on the motor shaft 310 and fixed relatively to the motor shaft 310, and the stator 330 is sleeved on the outer peripheral side of the rotor 320. There is an air gap between the stator 330 and the rotor 320, and the rotor 320 and the motor shaft 310 can rotate relative to the stator 330.

[0074] In some embodiments, the reducer 600 includes a gear reducer, a worm reducer, a worm gear reducer, a gear-worm reducer, a planetary gear reducer, a cycloid reducer, a harmonic gear reducer, and the like.

[0075] In some embodiments, the powertrain 10 further includes a motor controller (MCU). The motor controller, the motor 300 and the reducer 600 are integrated to reduce the volume. The motor controller is used to control at least one of the reducer 600, the vehicle power system and the battery management system.

[0076] In one embodiment, the vehicle 1 includes a plurality of powertrains 10 (eg Figure 1 As shown), the placement positions of the multiple power assemblies 10 on the vehicle 1 can be the same or different.

[0077] The vehicle 1 includes a car, a robot or other forms of driving equipment, wherein the car includes an electric vehicle / electric vehicle (EV), a pure electric vehicle / battery electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, etc. In some embodiments, the vehicle 1 includes a passenger car, various special operation vehicles with specific functions, such as an engineering rescue vehicle, a watering truck, a sewage suction truck, a cement mixer truck, a crane truck, a medical vehicle, etc.

[0078] For example, Figure 1 As shown, the vehicle 1 is a car, which includes a vehicle body 11 and a powertrain 10 installed on the vehicle body 11. The vehicle 1 also includes wheels. The output end of the reducer in the powertrain 10 is connected to the wheel drivingly for driving the wheel to rotate, so as to drive the vehicle 1 to travel.

[0079] The powertrain of the present application is described in detail below.

[0080] See also Figure 2 and Figure 3 , Figure 2 is a structural schematic diagram of a powertrain 10 provided in this application, Figure 3 1 is a three-dimensional schematic diagram of a power assembly 10 provided in the present application. The power assembly 10 includes a housing 100, a partition 200, a motor 300, a first liquid return channel 400 and a second liquid return channel 500. The partition 200 divides the interior of the housing 100 into a first cavity 110 and a second cavity 120 (such as Figure 2 The motor 300 is located in the first cavity 110, and the motor 300 includes a motor shaft 310, which extends into the second cavity 120 through the partition 200; the first liquid return channel 400 is located outside the shell 100 and communicates with the first cavity 110 and the second cavity 120, and is used to transport the liquid in the first cavity 110 to the second cavity 120; the second liquid return channel 500 is located outside the shell 100 and communicates with the first cavity 110 and the second cavity 120, and is used to transport the liquid in the first cavity 110 to the second cavity 120, and the second liquid return channel 500 and the first liquid return channel 400 overlap at most in the circumferential direction C of the motor shaft 310.

[0081] Among them, the shell 100 isolates the motor 300 and the reducer 600 from the external environment. On the one hand, the shell 100 can be used to protect the powertrain 10 and prevent the motor 300 and the reducer 600 from colliding with the external environment and being damaged; on the other hand, the powertrain 10 will generate vibrations during use. The setting of the shell 100 can reduce the vibrations generated by the powertrain 10 during use, prevent the powertrain 10 from causing damage to other components of the vehicle 1, and reduce the noise generated by the powertrain 10.

[0082] The partition 200 separates the first cavity 110 and the second cavity 120. The partition 200 and the shell 100 limit the motor 300 to the first cavity 110. The motor 300 is an electromagnetic device that realizes electric energy conversion or transmission based on the law of electromagnetic induction. The motor can generate driving torque and serve as the power source of the power assembly 10. When the power assembly 10 is applied to an electric vehicle, the motor 300 converts electric energy into kinetic energy during operation, thereby driving the wheels of the electric vehicle to rotate so that the electric vehicle can travel.

[0083] When the motor 300 is working, heat is generated, causing the temperature of the motor 300 to rise. High temperature will affect the performance of the motor 300. If the motor 300 is not cooled in time, the motor 300 will be damaged due to excessive temperature, thereby reducing the working efficiency of the power assembly 10. At the same time, when the motor 300 is working, the motor shaft 310 rotates, and wear will occur between the motor shaft 310 and the parts coupled to the motor shaft 310. For example, if the bearings and gears in the power assembly 10 are severely worn, it is easy to cause the motor 300 to fail to work normally.

[0084] In one embodiment, the liquid in the first cavity 110 and the second cavity 120 is a cooling lubricant, which is used to cool the motor 300 to prevent the motor 300 from being damaged due to excessive temperature, thereby causing the powertrain 10 to fail. At the same time, the cooling lubricant can be used to lubricate the motor shaft 310 to prevent the wear between the motor shaft 310 and other components. In other embodiments, the liquid in the first cavity 110 and the second cavity 120 can also be water, a water-oil mixture or other media, which is not specifically limited in this application. In one embodiment, the powertrain 10 also includes an oil pump and an oil cooler (not shown in the figure), and the oil pump is used to drive the cooling lubricant to circulate between the first cavity 110 and the second cavity 120. When the cooling lubricant flows through the motor 300, it can take away the heat generated by the motor 300 when it is working. The higher temperature cooling lubricant is cooled when passing through the oil cooler and continues to be used to cool the motor 300.

[0085] The first liquid return channel 400 and the second liquid return channel 500 are both fixedly connected to the housing 100 and are located outside the first cavity 110 and the second cavity 120. The first liquid return channel 400 and the second liquid return channel 500 have a receiving space inside for liquid to pass through. The liquid in the first cavity 110 flows into the second cavity 120 through the first liquid return channel 400, or the liquid in the first cavity 110 flows into the second cavity 120 through the second liquid return channel 500, or the liquid in the first cavity 110 flows into the second cavity 120 through the first liquid return channel 400 and the second liquid return channel 500 at the same time. When the power assembly 10 is in use or when the power assembly 10 is installed in different vehicles 1, the relative positions of the first liquid return channel 400, the second liquid return channel 500 and the motor 300 in the gravity direction G will change. The gravity direction G is a vertical downward direction, and the gravity direction G is perpendicular to the horizontal direction.

[0086] In one embodiment, in the initial state, the power assembly 10 is placed vertically (eg Figure 8As shown in FIG. 1 ), the first liquid return channel 400 is located below the liquid surface of the first cavity 110 in the gravity direction G, and the second liquid return channel 500 is located above the liquid surface of the first cavity 110 in the gravity direction G. The liquid in the first cavity 110 flows to the second cavity 120 through the first liquid return channel 400. At a certain moment, the relative positions of the first liquid return channel 400, the second liquid return channel 500 and the motor 300 in the gravity direction G will change, such as when the power assembly 10 is placed horizontally (such as Fig.11 As shown), the first liquid return channel 400 is located above the liquid surface of the first cavity 110 in the gravity direction G, and the second liquid return channel 500 is located below the liquid surface of the first cavity 110 in the gravity direction G. At this time, the liquid in the first cavity 110 flows to the second cavity 120 through the second liquid return channel 500.

[0087] In one embodiment, the power assembly 10 is installed on the vehicle 1. When the vehicle 1 is on a horizontal ground, at least a portion of the first liquid return passage 400 and the second liquid return passage 500 are located below the liquid surface of the first cavity 110 (e.g., Fig.14 As shown), at this time, the liquid in the first cavity 110 is discharged into the second cavity 120 through the first liquid return channel 400 and the second liquid return channel 500 at the same time; when the vehicle 1 goes uphill, the height of the second liquid return channel 500 increases to above the liquid level of the first cavity 110 and the first liquid return channel 400 is still below the liquid level (as shown in FIG. Fig. 9 As shown), the liquid in the first cavity 110 is discharged into the second cavity 120 through the first liquid return channel 400 at the same time; when the vehicle 1 goes downhill, the height of the first liquid return channel 400 increases to above the liquid level of the first cavity 110 and the second liquid return channel 500 is below the liquid level (as shown Fig.13 As shown in FIG. 1 , the liquid in the first cavity 110 is simultaneously discharged into the second cavity 120 through the second liquid return channel 500 .

[0088] In this embodiment, the flow direction of the liquid is as follows: Figure 2 As shown by the dotted arrow in , the oil pump drives the liquid in the first cavity 110 into the return liquid channel, and then drives the liquid in the return liquid channel to the second cavity 120. After being cooled by the oil cooler, the liquid is transported to a higher point of the first cavity 110 in the gravity direction G. Under the action of gravity, the liquid flows through the motor 300 and flows down to the return liquid channel located at a lower point of the first cavity 110 in the gravity direction G, and then continues to circulate. In other embodiments, if the flow direction of the liquid driven by the oil pump changes, the first return liquid channel 400 and the second return liquid channel 500 are used to transport the liquid in the second cavity 120 to the first cavity 110, and the oil pump drives the liquid in the second cavity 120 to flow into the return liquid channel, and then drives the liquid in the return liquid channel to the first cavity 110.

[0089] In one embodiment, the power assembly 10 includes more than two liquid return channels, which are located on the outside of the shell 100 and are connected to the first cavity 110 and the second cavity 120, and are used to transport the liquid in the first cavity 110 to the second cavity 120. The two or more liquid return channels overlap at most partially in the circumferential direction C of the motor shaft 310.

[0090] In one embodiment, the second liquid return channel 500 and the first liquid return channel 400 do not overlap in the circumferential direction C of the motor shaft 310 (eg, Figure 3 In one embodiment, the second liquid return channel 500 and the first liquid return channel 400 partially overlap in the circumferential direction C of the motor shaft 310 (as shown in FIG. Figure 4 As shown), that is, part of the second liquid return channel 500 is fixedly connected to the shell 100, and part of the second liquid return channel 500 is fixedly connected to the first liquid return channel 400, or part of the first liquid return channel 400 is fixedly connected to the shell 100, and part of the first liquid return channel 400 is fixedly connected to the second liquid return channel 500, and the first liquid return channel 400 is in direct contact with the second liquid return channel 500. However, in the present application, the first liquid return channel 400 and the second liquid return channel 500 overlap at most partially in the circumferential direction C of the motor shaft 310, and cannot overlap completely. If the first liquid return channel 400 and the second liquid return channel 500 completely overlap in the circumferential direction C of the motor shaft 310, the liquid levels in the first liquid return channel 400 and the second liquid return channel 500 will always remain the same at any angle between the power assembly 10 and the horizontal plane. The first liquid return channel 400 and the second liquid return channel 500 have the same liquid level, which is equivalent to one liquid return channel, and it is impossible to realize that the power assembly 10 uses different liquid return channels to transport cooling liquid at different angles.

[0091] If only one liquid return channel is provided, the position of the powertrain 10 changes during use or the installation angle of the powertrain 10 changes when it is installed in different vehicles 1, and the position of the liquid return channel in the gravity direction G changes. When the liquid return channel is higher than the liquid level of the first cavity 110, the liquid in the first cavity 110 cannot be discharged into the second cavity 120 through the liquid return channel and accumulates in the first cavity 110, so that the liquid participating in the cooling cycle is reduced, thereby reducing the cooling effect; or when the highest point of the liquid return channel is higher than the preset liquid level in the first cavity 110, the liquid level in the first cavity 110 will be higher than the preset liquid level, which cannot meet the performance requirements of the powertrain 10, affects the efficiency of the powertrain 10, and even damages the powertrain 10, wherein the preset liquid level refers to the liquid level of the cooling liquid in the first cavity 110 that can ensure the normal operation of the motor 300. Exemplarily, the preset liquid level is the same as the height of the lowest point of the air gap 340 in the gravity direction.

[0092] If only one liquid return channel is set, the production line test process of the powertrain 10 must also be designed according to the layout angle of the powertrain 10 in the whole vehicle. If the powertrain 10 is used to be installed on vehicles 1 of different models, in order to test the oil return requirements of the cooling liquid when installed on different vehicles 1, different production line test scenarios need to be set. When there are more application models, more corresponding production line test scenarios need to be set, which will increase the test cost and complicate the test process.

[0093] In the present application, a first liquid return channel 400 and a second liquid return channel 500 are provided, and the first liquid return channel 400 and the second liquid return channel 500 are located at different positions of the shell 100, and the two liquid return channels are used together to transport the liquid in the first cavity 110 to the second cavity 120. On the one hand, after the power assembly 10 is installed on the vehicle 1, when the environment of the vehicle 1 changes, for example, when the tilt angle of the placement becomes larger, the two liquid return channels can ensure that the liquid in the first cavity 110 is smoothly discharged into the second cavity 120, and the liquid level in the first cavity 110 is maintained below the preset liquid level, so that the efficiency of the motor 300 is improved; on the other hand, when the power assembly 10 is installed on different vehicles 1, the installation position or installation angle of the power assembly 10 changes, and the provision of the two liquid return channels can enhance the adaptability of the power assembly 10, so that the power assembly 10 can be flexibly arranged on the vehicle 1; on the third hand, the production line test process corresponding to the power assembly 10 is carried out according to the power assembly 1 0 is designed from the perspective of the layout of the vehicle 1. By setting up two liquid return channels, the drainage requirements of the first cavity 110 can be met, so that one production line can be compatible with various models of vehicles 1, reducing the cost of the test production line; fourthly, the liquid level in the first cavity 110 is relatively high. When the first liquid return channel 400 and the second liquid return channel 500 are both located below the liquid level, the liquid in the first cavity 110 is discharged through the two liquid return channels at the same time, so that the liquid in the first cavity 110 can be discharged faster. When one of the liquid return channels is blocked, the other liquid return channel can continue to work to prevent liquid from accumulating in the first cavity 110, thereby improving the cooling effect and ensuring the heat dissipation performance of the powertrain 10.

[0094] After the power assembly 10 is loaded on the vehicle, if the vehicle 1 is located on a smooth road, if the first liquid return channel 400 is located at the lower point of the first cavity 110 along the gravity direction G, the liquid in the first cavity 110 is transported to the second cavity 120 through the first liquid return channel 400. When the whole vehicle travels to a relatively extreme slope, after the power assembly 10 reaches a certain inclination angle, the height of the first liquid return channel 400 in the gravity direction G becomes larger, and the second liquid return channel 500 is located at the lower point of the first cavity 110 along the gravity direction G. The liquid in the first cavity 110 is transported to the second cavity 120 through the second liquid return channel 500. When the position of the power assembly 10 changes, the two liquid return channels can ensure that the liquid in the first cavity 110 is smoothly transported to the second cavity 120. At the same time, when the powertrain 10 is installed on different vehicle models, the installation angle changes. The setting of the two return liquid channels can also enable the first cavity 110 to meet the drainage requirements, so that the powertrain 10 can be adapted to different vehicle models and meet the requirements of flexible layout of the powertrain 10. Correspondingly, the production line of the vehicle 1 can also be compatible with a variety of models, reducing the cost of the test production line.

[0095] In a possible implementation, the second liquid return channel 500 and the first liquid return channel 400 are spaced apart in the circumferential direction C of the motor shaft 310 (eg, Figure 3 As shown). The second liquid return channel 500 does not contact the first liquid return channel 400, and both liquid return channels are connected to the first cavity 110. The liquid in the first cavity 110 can flow into the liquid return channel at a lower position according to the height of the second liquid return channel 500 and the first liquid return channel 400 in the gravity direction G. When the power assembly 10 changes an angle and the power assembly 10 reaches a certain inclination angle, so that the height of the second liquid return channel 500 and the first liquid return channel 400 in the gravity direction G changes, the liquid in the first cavity 110 can flow into another liquid return channel that is lower from the ground. When the power assembly 10 is applied to the vehicle 1, the second liquid return channel 500 and the first liquid return channel 400 are arranged at intervals. When the vehicle 1 travels to a larger slope, the liquid in the first cavity 110 can still be discharged smoothly, so that the vehicle 1 can adapt to a larger slope.

[0096] In a possible implementation, in the axial direction A of the motor shaft 310, at least part of the first liquid return channel 400 and at least part of the second liquid return channel 500 are located on the side of the partition 200 facing the first cavity 110. In one embodiment, the first liquid return channel 400 and the second liquid return channel 500 are located on the side of the partition 200 facing the first cavity 110 (e.g. Figure 3As shown in FIG. 1 ), the liquid at one end of the first cavity 110 away from the partition 200 along the axial direction A can flow into the second cavity 120 through the first liquid return channel 400 and the second liquid return channel 500. In one embodiment, one of the first liquid return channel 400 and the second liquid return channel 500 is located on the side of the partition 200 facing the first cavity 110, and the other of the first liquid return channel 400 and the second liquid return channel 500 is partially located on the side of the partition 200 facing the first cavity 110, and partially located on the side of the partition 200 facing the second cavity 120 (as shown in FIG. 1 ). Figure 5 In one embodiment, the first liquid return channel 400 and the second liquid return channel 500 are partially located on the side of the partition 200 facing the first cavity 110, and the other part is located on the side of the partition 200 facing the second cavity 120. The positions of the first liquid return channel 400 and the second liquid return channel 500 can be determined according to the shape of the housing 100 and the setting of the flow channel in the housing 100, and can ensure that the liquid in the first cavity 110 is smoothly discharged into the second cavity 120.

[0097] In a possible implementation, the first liquid return channel 400 and / or the second liquid return channel 500 extend along the axial direction A of the motor shaft 310. In one embodiment, the first liquid return channel 400 and the second liquid return channel 500 both extend along the axial direction A of the motor shaft 310 (eg, Figure 3 As shown in FIG. 1 ), the lengths of the first liquid return channel 400 and the second liquid return channel 500 are relatively short, and the liquid in the first cavity 110 can flow into the second cavity 120 after a relatively short distance, and the liquid discharge efficiency in the first cavity 110 is high. In one embodiment, one of the first liquid return channel 400 and the second liquid return channel 500 extends along the axial direction A of the motor shaft 310, and the extension direction of the other of the first liquid return channel 400 and the second liquid return channel 500 intersects with the axial direction A of the motor shaft 310 (as shown in FIG. 1 ). Figure 6 In one embodiment, the extension direction of the first liquid return channel 400 and the second liquid return channel 500 intersects with the axial direction A of the motor shaft 310. In some embodiments, the overall shape of at least one of the first liquid return channel 400 and the second liquid return channel 500 may be curved, arc-shaped, folded-line-shaped, etc.

[0098] In a possible implementation, in the circumferential direction C of the motor shaft 310, the angle between the first connecting line L1 between the first liquid return channel 400 and the motor shaft 310 and the second connecting line L2 between the second liquid return channel 500 and the motor shaft 310 is less than or equal to 90° (e.g. Figure 7The first connecting line L1 is a connecting line between the midpoint of the first liquid return channel 400 in the circumferential direction C of the motor shaft 310 and the motor shaft 310 along the radial direction of the motor shaft 310, and the second connecting line L2 is a connecting line between the midpoint of the second liquid return channel 500 in the circumferential direction C and the motor shaft 310 along the radial direction of the motor shaft 310. The angle between the first connecting line L1 and the second connecting line L2 is less than or equal to 90°, so that the first cavity 110 can meet the requirement of smooth liquid discharge when the power assembly 10 is placed horizontally or vertically.

[0099] In one embodiment, the included angle between the first connecting line L1 and the second connecting line L2 may also be greater than 90° and less than or equal to 180°.

[0100] In a possible implementation, the motor 300 includes a rotor 320, and the highest point of the internal accommodation space of at least one of the first liquid return channel 400 and the second liquid return channel 500 in the gravity direction G is lower than the lowest point of the outer surface of the rotor 320, and the lowest point of the outer surface of the rotor 320 is the lowest point of the rotor 320 in the gravity direction G when the power assembly 10 is in use. In this embodiment, the motor 300 also includes a stator 330 (such as a stator 330) sleeved on the outside of the rotor 320. Figure 3 and Figure 8 As shown in FIG. 3 , the rotor 320 is fixed on the motor shaft 310, and the gap between the outer surface of the rotor 320 and the inner surface of the stator 330 is an air gap 340. If the cooling liquid, such as cooling oil, is immersed in the air gap 340 for a long time, the efficiency of the motor 300 will be reduced and damaged. Since the first liquid return channel 400 and the second liquid return channel 500 are both connected to the first cavity 110, the cooling liquid circulates in the first liquid return channel 400, the second liquid return channel 500 and the first cavity 110. When the highest point of the internal receiving space of at least one of the first liquid return channel 400 and the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320, the highest position of the liquid level in the first cavity 110 is equal to the highest point of the lower one of the first liquid return channel 400 and the second liquid return channel 500. When the lower one of the first liquid return channel 400 and the second liquid return channel 500 is filled with liquid, the liquid flows into the second cavity 120, thereby preventing the cooling liquid from soaking in the air gap 340 for a long time.

[0101] When the arrangement angle of the power assembly 10 changes during use, the power assembly 10, at various arrangement angles, satisfies that the highest point of the internal accommodation space of at least one of the first liquid return channel 400 and the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320, so that the liquid in the first cavity 110 cannot fill the air gap 340, that is, the liquid in the first cavity 110 cannot fill the partial air gap 340 between the lowest point of the outer surface of the rotor 320 and the lowest point of the inner surface of the stator 330, so as to ensure the working efficiency and reliability of the motor 300.

[0102] In one embodiment, the highest point of the internal accommodation space of the first liquid return channel 400 in the gravity direction G is lower than the lowest point of the outer surface of the rotor 320 (eg Figure 8 , Fig. 9 and Fig.10 That is, at any time during the use of the power assembly 10, the highest point of the internal accommodation space of the first liquid return channel 400 is lower than the lowest point of the outer surface of the rotor 320. When the first liquid return channel 400 is completely filled with liquid or partially filled with liquid, the liquid level of the first liquid return channel 400 is lower than the lowest point of the outer surface of the rotor 320. Even if only one first liquid return channel 400 is used, the discharge requirement of the first cavity 110 can be met, and it can also be ensured that the liquid in the first cavity 110 does not fill the air gap 340.

[0103] In one embodiment, the highest point of the internal accommodation space of the second liquid return channel 500 in the gravity direction G is lower than the lowest point of the outer surface of the rotor 320 (eg Fig.11 , Fig.12 and Fig.13 That is, at any time during the use of the power assembly 10, the highest point of the internal accommodation space of the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320. When the second liquid return channel 500 is completely filled with liquid or partially filled, the liquid level of the liquid in the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320. Even if only one second liquid return channel 500 is used, the discharge requirements of the first cavity 110 can be met, and it can also be ensured that the liquid accumulated in the first cavity 110 cannot fill the air gap 340, so as to ensure the working efficiency and reliability of the motor 300.

[0104] In one embodiment, the powertrain 10 is placed vertically (eg Figure 8 The highest point of the internal receiving space of the first return channel 400 in the gravity direction G is lower than the lowest point of the outer surface of the rotor 320. The arrangement angle of the power assembly 10 changes during use, such as when the power assembly 10 changes from vertical placement to horizontal placement (such as Fig.11 As shown in FIG. 5 , the highest point of the internal accommodation space of the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320. The above two embodiments can meet the cooling liquid return requirements and ensure the cooling and heat dissipation effect of the power assembly 10.

[0105] In one embodiment, the highest point of the internal accommodation space of at least one of the first liquid return channel 400 and the second liquid return channel 500 in the gravity direction G is lower than the lowest point of the air gap 340. That is, the highest point of the internal accommodation space of at least one of the first liquid return channel 400 and the second liquid return channel 500 is lower than the lowest point of the inner surface of the stator 330, so that liquid does not accumulate in the air gap 340, and the working efficiency and reliability of the motor 300 can be better guaranteed.

[0106] In one embodiment, the power assembly 10 is applied to the vehicle 1. When the vehicle 1 is placed horizontally, the power assembly 10 is placed vertically (eg, Figure 8 As shown), at this time, the height of the first liquid return channel 400 in the gravity direction G is lower than the height of the second liquid return channel 500 in the gravity direction G, the lowest point of the internal accommodation space of the second liquid return channel 500 in the gravity direction G is higher than the lowest point of the outer surface of the rotor 320, the liquid in the first cavity 110 enters the second cavity 120 through the first liquid return channel 400, the endpoints of the internal accommodation space of the first liquid return channel 400 at both ends along the circumferential direction C are A1 and A2 respectively, the horizontal straight line passing through the lowest point of the outer surface of the rotor 320 is the first straight line S1, A1 and A2 are both lower than the first straight line S1, the line connecting the center of the motor shaft 310 and A1 is the second straight line S2, the line connecting the center of the motor shaft 310 and A2 is the third straight line S3, the straight line passing through the center of the motor shaft 310 and perpendicular to the ground is the fourth straight line S4, the angle between the second straight line S2 and the fourth straight line S4 is α1, and the angle between the third straight line S3 and the fourth straight line S4 is α2;

[0107] When vehicle 1 is on a slope and A2 is higher than A1 (e.g. Fig. 9 As shown), the inclination angle of the slope, that is, the angle between the slope and the horizontal direction is γ1. At this time, the fourth straight line S4 is a straight line passing through the center of the motor shaft 310 and perpendicular to the slope. The straight line passing through the center of the motor shaft 310 and perpendicular to the horizontal direction is the fifth straight line S5. The angle between the fifth straight line S5 and the second straight line S2 is θ1. At this time, in order to make A2 lower than the lowest point of the outer surface of the rotor 320, that is, A2 is lower than or equal to the first straight line S1, it is necessary to meet the following conditions:

[0108] θ1+α1+α2≤arccos(r / R);

[0109] Wherein, R is the radius of the housing 100 outside the first cavity 110, r is the radius of the rotor 320, and the sum of θ1+α1+α2 is the angle between the fifth straight line S5 and the third straight line S3.

[0110] Since θ1+α1=γ1, then:

[0111] α2≤arccos(r / R)-γ1.

[0112] The sum of θ1+α1 is the angle between the fifth straight line S5 and the fourth straight line S4.

[0113] γ1 is the maximum uphill / downhill inclination angle of the vehicle 1, and α2 takes the maximum value arccos(r / R)-γ1, thereby determining the highest position of A2 on the housing 100. In some embodiments, the specific position of A2 can be selected according to the discharge volume of the first liquid return channel 400. If the return volume of point A2 is too large when α2 is at the maximum value, a lower position A2 with a smaller α2 can be selected.

[0114] Similarly, when vehicle 1 is on a slope and A1 is higher than A2 (e.g. Fig.10 As shown), the inclination angle of the slope, that is, the angle between the slope and the horizontal direction is γ1. At this time, the fourth straight line S4 is a straight line passing through the center of the motor shaft 310 and perpendicular to the slope. The straight line passing through the center of the motor shaft 310 and perpendicular to the horizontal direction is the fifth straight line S5. The angle between the fifth straight line S5 and the third straight line S3 is θ2. At this time, in order to make A1 lower than the lowest point of the outer surface of the rotor 320, that is, A1 is lower than the first straight line S1, it is necessary to satisfy:

[0115] θ2+α1+α2≤arccos(r / R);

[0116] Since θ2+α2=γ1, then:

[0117] α1≤arccos(r / R)-γ1.

[0118] γ1 is the maximum uphill / downhill inclination angle of the vehicle 1, and α1 takes the maximum value arccos(r / R)-γ1, thereby determining the highest position of A1 on the housing 100. In some embodiments, the specific position of A1 can be selected according to the discharge volume of the first liquid return channel 400.

[0119] When the maximum values ​​of α1 and α2 are determined, when designing the first liquid return channel 400, it is only necessary to satisfy that the designed α1 and α2 are less than or equal to the maximum values ​​of α1 and α2. The positions of A1 and A2 can be determined, and the radial size of the inner cavity of the first liquid return channel 400 along the motor shaft 310 is also determined accordingly. The vehicle 1 can travel on a slope with an angle of 0-γ1, and ensure that the highest point of the internal accommodation space of the first liquid return channel 400 in the gravity direction G is always lower than the lowest point of the outer surface of the rotor 320, and the liquid in the first cavity 110 can enter the second cavity 120 through the first liquid return channel 400.

[0120] In one embodiment, the power assembly 10 is applied to the vehicle 1. When the vehicle 1 is placed horizontally, the power assembly 10 is placed horizontally (eg Fig.11As shown), at this time, the height of the second liquid return channel 500 in the gravity direction G is lower than the height of the first liquid return channel 400 in the gravity direction G, the lowest point of the internal accommodation space of the first liquid return channel 400 in the gravity direction G is higher than the lowest point of the outer surface of the rotor 320, the liquid in the first cavity 110 enters the second cavity 120 through the second liquid return channel 500, the endpoints of the internal accommodation space of the second liquid return channel 500 along the circumferential direction C are B1 and B2 respectively, the horizontal straight line passing through the lowest point of the outer surface of the rotor 320 is the first straight line S1', B1 and B2 are both lower than the first straight line S1', the line connecting the center of the motor shaft 310 and B1 is the second straight line S2', the line connecting the center of the motor shaft 310 and B2 is the third straight line S3', the straight line passing through the center of the motor shaft 310 and perpendicular to the ground is the fourth straight line S4', the angle between the second straight line S2' and the fourth straight line S4' is β1, and the angle between the third straight line S3' and the fourth straight line S4' is β2;

[0121] When vehicle 1 is on a slope and B2 is higher than B1 (e.g. Fig.12 As shown), the inclination angle of the slope, that is, the angle between the slope and the horizontal direction is γ2. At this time, the fourth straight line S4' is a straight line passing through the center of the motor shaft 310 and perpendicular to the slope. The straight line passing through the center of the motor shaft 310 and perpendicular to the horizontal direction is the fifth straight line S5'. The angle between the fifth straight line S5' and the second straight line S2' is θ1. At this time, in order to make B2 lower than the lowest point of the outer surface of the rotor 320, that is, B2 is lower than the first straight line S1', it is necessary to satisfy:

[0122] θ1+β1+β2≤arccos(r / R);

[0123] Wherein, R is the radius of the housing 100 located outside the first cavity 110 , and r is the radius of the rotor 320 .

[0124] Since θ1+β1=γ2, then:

[0125] β2≤arccos(r / R)-γ2.

[0126] γ2 is the maximum uphill / downhill inclination angle of the vehicle 1, and β2 takes the maximum value arccos(r / R)-γ2, thereby determining the highest position of B2 on the housing 100. In one embodiment, the specific position of B2 can be selected according to the discharge volume of the second liquid return channel 500.

[0127] Similarly, when vehicle 1 is on a slope and B1 is higher than B2 (e.g. Fig.13As shown), the inclination angle of the slope, that is, the angle between the slope and the horizontal direction is γ2. At this time, the fourth straight line S4' is a straight line passing through the center of the motor shaft 310 and perpendicular to the slope. The straight line passing through the center of the motor shaft 310 and perpendicular to the horizontal direction is the fifth straight line S5'. The angle between the fifth straight line S5' and the third straight line S3' is θ2. At this time, in order to make B1 lower than the lowest point of the outer surface of the rotor 320, that is, B1 is lower than the first straight line S1', it is necessary to satisfy:

[0128] θ2+β1+β2≤arccos(r / R);

[0129] Since θ2+α2=γ2, then:

[0130] β1≤arccos(r / R)-γ2.

[0131] γ2 is the maximum uphill / downhill inclination angle of the vehicle 1, and β1 takes the maximum value arccos(r / R)-γ2, thereby determining the highest position of B1 on the housing 100. In one embodiment, the specific position of B1 can be selected according to the discharge volume of the second liquid return channel 500.

[0132] When the maximum values ​​of β1 and β2 are determined, when designing the second liquid return channel 500, it is only necessary to satisfy that the designed β1 and β2 are less than or equal to the maximum values ​​of β1 and β2. The positions of B1 and B2 can be determined, and the radial size of the inner cavity of the second liquid return channel 500 along the motor shaft 310 is also determined accordingly. The vehicle 1 can travel on a slope with an angle of 0-γ2, and ensure that the highest point of the internal accommodation space of the second liquid return channel 500 in the gravity direction G is always lower than the lowest point of the outer surface of the rotor 320, and the liquid in the first cavity 110 can enter the second cavity 120 through the second liquid return channel 500.

[0133] In one embodiment, the power assembly 10 is applied to the vehicle 1. When the vehicle 1 is placed horizontally, the power assembly 10 is placed at an angle to the horizontal direction (eg Fig.14 As shown), at this time, the lowest points of the internal containing spaces of the first liquid return channel 400 and the second liquid return channel 500 in the gravity direction G are both lower than the lowest point of the outer surface of the rotor 320, and the highest points of the internal containing spaces of the first liquid return channel 400 and the second liquid return channel 500 in the gravity direction G can be higher than the lowest point of the outer surface of the rotor 320, and the liquid in the first cavity 110 enters the second cavity 120 through the first liquid return channel 400 and the second liquid return channel 500 at the same time; when the vehicle 1 travels to the slope, when the height of the second liquid return channel 500 in the gravity direction G increases (as shown Fig.15As shown in FIG. 1 ), the highest point of the internal receiving space of the first liquid return channel 400 in the gravity direction G is lower than the lowest point of the outer surface of the rotor 320, and the liquid in the first cavity 110 can enter the second cavity 120 through the first liquid return channel 400; when the height of the first liquid return channel 400 in the gravity direction G increases (as shown in FIG. Fig.16 As shown), the highest point of the internal accommodation space of the second liquid return channel 500 in the gravity direction G is lower than the lowest point of the outer surface of the rotor 320, and the liquid in the first cavity 110 can enter the second cavity 120 through the second liquid return channel 500.

[0134] When the power assembly 10 is arranged at any angle on the vehicle, such as 0 to 90 degrees, the vehicle 1 returns oil through the combination of the first return channel 400 and the second return channel 500 on a flat road; when going uphill or downhill, the vehicle 1 returns oil through the combination of the two return channels or a single return channel. This arrangement allows the power assembly 10 to fully utilize the first return channel 400 and the second return channel 500 for discharge, and the arrangement angle of the power assembly 10 on the vehicle 1 is wider, so as to enhance the adaptability of the power assembly 10.

[0135] In one embodiment, when the amount of liquid discharged in the first cavity 110 is large and two liquid return channels are required to work simultaneously for discharge, the highest points of the internal receiving spaces of the first liquid return channel 400 and the second liquid return channel 500 can be set lower than the lowest point of the outer surface of the rotor 320.

[0136] The power assembly 10 described above may also be applied to other traveling equipment, such as ships and the like.

[0137] In a possible implementation, the motor 300 includes a rotor 320, and a first liquid level in the first liquid return channel 400 and a second liquid level in the second liquid return channel 500 are lower than the lowest point of the outer surface of the rotor 320 (eg, Fig.14As shown), the lowest point of the outer surface of the rotor 320 is the lowest point in the gravity direction G when the power assembly 10 is in use. After the discharge volumes of the first liquid return channel 400 and the second liquid return channel 500 are designed according to the required discharge volume of the first cavity 110, when the first liquid return channel 400 and the second liquid return channel 500 are used together for discharge, the liquid volume does not fill the entire first liquid return channel 400 and the second liquid return channel 500. At this time, although the highest points of the first liquid return channel 400 and the second liquid return channel 500 are higher than the lowest point of the outer surface of the rotor 320, the liquid level of one or two of the liquids in the first liquid return channel 400 and the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320, so that the liquid in the first cavity 110 cannot fill the air gap 340, so as to ensure the working efficiency and reliability of the motor 300; when the positional relationship between the first liquid return channel 400 and the second liquid return channel 500 changes, and only one liquid return channel is involved in the discharge, it is only necessary to ensure that the liquid level of the liquid return channel in use is lower than the lowest point of the outer surface of the rotor 320, so that the liquid in the first cavity 110 cannot fill the air gap 340.

[0138] In a possible implementation, the powertrain 10 further includes a reducer 600 (eg Figure 2 As shown), the reducer 600 is located in the second cavity 120, and the reducer 600 includes an output shaft 610, which is coupled to the motor shaft 310 at one end of the second cavity 120; the output shaft 610 and the motor shaft 310 are arranged side by side along a first direction X, and in the first direction X, the first liquid return channel 400 is located between the output shaft 610 and the motor shaft 310, and the first direction X intersects with the axial direction A of the motor shaft 310.

[0139] In one embodiment, the output shaft 610 and the motor shaft 310 are arranged in parallel. In one embodiment, when the first direction X is parallel to the gravity direction G, the power assembly 10 is placed vertically (eg Figure 8 As shown), when the first direction X is perpendicular to the gravity direction G, the power assembly 10 is placed horizontally (as shown Fig.11 In one embodiment, when the power assembly 10 is installed on the vehicle 1, the output shaft 610 is located on the side of the motor shaft 310 close to the ground along the gravity direction G, and the height of the first liquid return channel 400 in the gravity direction G is lower than the height of the second liquid return channel 500 in the gravity direction G.

[0140] In one embodiment, the powertrain 10 further includes an MCU, which can be used to control the operation of the motor 300 , the reducer 600 , the oil pump, and the oil cooler.

[0141] In a possible implementation, the motor 300 includes a first end surface 301 and a second end surface 302 arranged along the axial direction A (eg, Figure 2As shown in the figure, the first end face 301 is arranged farther away from the partition 200 than the second end face 302, and the first liquid collecting chamber 111 is formed between the first end face 301 and the shell 100, and the first liquid return channel 400 and the second liquid return channel 500 are connected with the first liquid collecting chamber 111, and are used to transport the liquid in the first liquid collecting chamber 111 to the second cavity 120. Part of the liquid in the first cavity 110 is concentrated in the first liquid collecting chamber 111, and the liquid in the first liquid collecting chamber 111 is discharged by providing the first liquid return channel 400 and the second liquid return channel 500, and the liquid in the first cavity 110 can be discharged in a concentrated manner, thereby increasing the drainage efficiency of the first cavity 110.

[0142] In a possible implementation, the portion of the housing 100 constituting the first liquid collecting chamber 111 is provided with a first liquid outlet 101 (eg, Figure 2 As shown in FIG. 1 , a first liquid inlet 410 is provided at one end of the first liquid return channel 400 close to the first liquid collecting chamber 111, and the first liquid outlet 101 is communicated with the first liquid inlet 410. The liquid in the first liquid collecting chamber 111 enters the first liquid return channel 400 through the first liquid outlet 101 and the first liquid inlet 410 in sequence, and in the circumferential direction C of the motor shaft 310, the size of the first liquid outlet 101 is greater than or equal to the size of the first liquid inlet 410. By setting the size of the first liquid outlet 101 to be greater than or equal to the size of the first liquid inlet 410, the liquid in the first liquid collecting chamber 111 can be better discharged into the first liquid return channel 400 to prevent the liquid from accumulating in the first liquid collecting chamber 111.

[0143] In one embodiment, the size of the first liquid outlet 101 may also be smaller than the size of the first liquid inlet 410 .

[0144] In a possible implementation, the portion of the shell 100 constituting the first liquid collecting chamber 111 is provided with a second liquid outlet (not shown in the figure) penetrating the shell 100, and the second liquid return channel 500 is provided with a second liquid inlet at one end close to the first liquid collecting chamber 111, the second liquid outlet is connected to the second liquid inlet, and the liquid in the first liquid collecting chamber 111 enters the second liquid return channel 500 through the second liquid outlet and the second liquid inlet in sequence, and in the circumferential direction C of the motor shaft 310, the size of the second liquid outlet is greater than or equal to the size of the second liquid inlet. By setting the size of the second liquid outlet to be greater than or equal to the size of the second liquid inlet, the liquid in the first liquid collecting chamber 111 can be better discharged into the second liquid return channel 500, so as to prevent the liquid from accumulating in the first liquid collecting chamber 111.

[0145] In one embodiment, the size of the second liquid outlet may also be smaller than the size of the second liquid inlet.

[0146] In a possible implementation, a second liquid collecting chamber 112 is formed between the second end surface 302 and the partition plate 200, and a third liquid outlet 103 (such as Fig.17 As shown in the figure, the third liquid outlet 103 connects the second liquid collecting chamber 112 and the second cavity 120, and is used to transport the liquid in the second liquid collecting chamber 112 to the second cavity 120. Part of the liquid in the first cavity 110 is concentrated in the first liquid collecting chamber 111. By setting the third liquid outlet 103, the liquid in the second liquid collecting chamber 112 is directly discharged to the second cavity 120, and the liquid in the first cavity 110 can be discharged in a centralized manner, thereby increasing the liquid discharge efficiency of the first cavity 110.

[0147] In one embodiment, a fourth liquid inlet (not shown in the figure) penetrating the shell 100 is provided on the shell 100 located outside the second cavity 120, and a fourth liquid outlet is provided at one end of the first liquid return channel 400 and the second liquid return channel 500 close to the second cavity 120 along the axial direction A, and the fourth liquid inlet is connected to the fourth liquid outlet, and the liquid in the first liquid return channel 400 and the second liquid return channel 500 enters the second cavity 120 through the fourth liquid outlet and the fourth liquid inlet in turn.

[0148] In one embodiment, a fifth liquid inlet (not shown in the figure) is further provided on the partition 200, and the fifth liquid inlet connects the first cavity 110 and the second cavity 120. The fifth liquid inlet is located at a higher point of the partition 200 along the gravity direction G. After the liquid in the second cavity 120 is cooled, it enters the first cavity 110 through the fifth liquid inlet, and enters the air gap 340 between the stator 330 and the rotor 320 from the hole on the peripheral wall of the motor shaft 310. The liquid flows from the higher point in the gravity direction G to the lower point in the gravity direction G to cool and lubricate the stator 330 and the rotor 320 in the first cavity 110. The liquid in the first cavity 110 continues to flow into the second cavity 120 through the return liquid channel at the lower point in the gravity direction G.

[0149] In one embodiment, the motor shaft 310 is hollow inside, and the liquid in the second cavity 120 enters the first cavity 110 from the motor shaft 310 after being cooled, so as to cool and lubricate the stator 330 and the rotor 320 in the first cavity 110 .

[0150] In a possible implementation, in the circumferential direction C of the motor shaft 310, at least part of the third liquid outlet 103 overlaps with the first liquid return channel 400, and at least part of the third liquid outlet 103 overlaps with the second liquid return channel 500; the highest point of the third liquid outlet 103 is lower than the lowest point of the outer surface of the rotor, and the lowest point of the outer surface of the rotor is the lowest point of the rotor in the gravity direction G when the power assembly is in use. The partition 200 is provided with a plurality of third liquid outlets 103, such as Fig.17103a and 103b, part of the third liquid outlet 103a is arranged close to the first liquid return channel 400, and the projection of the third liquid outlet 103a when projected to the circumferential direction C at least partially overlaps with the projection of the first liquid return channel 400 when projected to the circumferential direction C, when the first liquid return channel 400 is used to discharge the liquid in the first liquid collecting chamber 111, the third liquid outlet 103a is used to discharge the liquid in the second liquid collecting chamber 112; part of the third liquid outlet 103b is arranged close to the second liquid return channel 500, and the projection of the third liquid outlet 103b when projected to the circumferential direction C at least partially overlaps with the projection of the second liquid return channel 500 when projected to the circumferential direction C, when the second liquid return channel 500 is used to discharge the liquid in the first liquid collecting chamber 111, the third liquid outlet 103b is used to discharge the liquid in the second liquid collecting chamber 112.

[0151] The highest point of the third liquid outlet 103 is lower than the lowest point of the outer surface of the rotor 320, so that the liquid in the second collecting chamber 112 cannot fill the air gap 340, that is, the liquid in the second collecting chamber 112 cannot fill the partial air gap 340 between the lowest point of the outer surface of the rotor 320 and the lowest point of the inner surface of the stator 330, so as to ensure the working efficiency and reliability of the motor 300.

[0152] In one embodiment, the third liquid outlet 103 is in the shape of a long strip (eg Fig.17 As shown in FIG. 1 , the third liquid outlet 103 extends along the circumferential direction C. This arrangement increases the area of ​​the third liquid outlet 103 and facilitates liquid discharge. In other embodiments, the third liquid outlet 103 may also be circular, elliptical, square or irregular in shape.

[0153] Please continue reading Figure 1 The present application provides a vehicle 1 , which includes a vehicle body 11 and a powertrain 10 as described in any one of the above items, and the powertrain 10 is installed on the vehicle body 11 .

[0154] In a possible implementation, the power assembly 10 further includes a reducer 600, the reducer 600 is located in the second cavity 120, the output shaft 610 of the reducer 600 and the motor shaft 310 are arranged along the first direction X, and the angle between the first direction X and the horizontal direction is a first angle φ1 (such as Fig.15 As shown), the highest point of the internal containing space of the first liquid return channel 400 and the second liquid return channel 500 is determined according to the first angle φ1, so that the liquid level of one or both of the liquids in the first liquid return channel 400 and the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320 of the motor 300.

[0155] In a possible implementation, the maximum climbing angle of the vehicle 1 is the second angle φ2 (eg Fig.16As shown), the highest point of the internal containing space of the first liquid return channel 400 and the second liquid return channel 500 is determined according to the first angle φ1 and the second angle φ2, so that the liquid level of one or both of the liquids in the first liquid return channel 400 and the second liquid return channel 500 is lower than the lowest point of the outer surface of the rotor 320 of the motor 300.

[0156] The powertrain and vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A powertrain, characterized in that: The power assembly includes a housing, a partition, a motor, a reducer and a motor controller. The motor controller, the motor and the reducer are arranged in an integrated manner. The partition is used to separate the interior of the housing into a first cavity and a second cavity. The motor is located in the first cavity, and the reducer is located in the second cavity. The motor includes a stator, a rotor and a motor shaft. The rotor is sleeved on the motor shaft, wherein: The motor shaft passes through the partition and extends into the second cavity and is drivingly connected to the reducer. A third liquid outlet penetrating the partition is provided on the partition, and the third liquid outlet communicates with the first cavity and the second cavity.

2. The powertrain according to claim 1, characterized in that: Along the gravity direction of the rotor, the highest point of the third liquid outlet is lower than the lowest point of the outer surface of the rotor.

3. The powertrain according to claim 1 or 2, characterized in that: The third liquid outlet extends along the circumferential direction of the partition plate, and the shape of the third liquid outlet is a long strip or an ellipse.

4. The powertrain according to any one of claims 1 to 3, characterized in that: The partition is also provided with a fifth liquid inlet, which is connected to the first cavity and the second cavity. Along the gravity direction of the partition, the height of the fifth liquid inlet is greater than the height of the third liquid outlet.

5. The powertrain according to any one of claims 1 to 4, characterized in that: The motor comprises a first end face and a second end face arranged in the axial direction, the first end face is arranged farther away from the partition than the second end face, and a first liquid collecting chamber is formed between the first end face and the shell; The power assembly further includes a first liquid return passage, and the first liquid return passage is used to connect the first liquid collecting chamber and the second cavity.

6. The powertrain according to claim 5, characterized in that: A first liquid inlet is provided at one end of the first liquid return channel close to the first liquid collecting chamber, a first liquid outlet penetrating through the shell body is provided on the shell body forming the first liquid collecting chamber, and the first liquid inlet is communicated with the first liquid outlet.

7. The powertrain according to claim 5 or 6, characterized in that: The first liquid return channel is located outside the housing and extends along the axial direction of the motor shaft.

8. The power assembly according to any one of claims 5 to 7, characterized in that: The highest point of the internal accommodation space of the first liquid return channel in the gravity direction is lower than the lowest point of the outer surface of the rotor.

9. The powertrain according to claim 6, characterized in that: In the circumferential direction of the motor shaft, a size of the first liquid outlet is greater than or equal to a size of the first liquid inlet.

10. The power assembly according to any one of claims 5 to 9, characterized in that: The power assembly further includes a second liquid return passage for connecting the first liquid collecting chamber and the second cavity, wherein the second liquid return passage is located outside the housing and extends along the axial direction of the motor shaft.

11. The powertrain according to claim 10, characterized in that: A second liquid outlet penetrating the shell is provided on the shell part constituting the first liquid collecting chamber, and a second liquid inlet is provided at one end of the second liquid return channel close to the first liquid collecting chamber, and the second liquid outlet is communicated with the second liquid inlet.

12. The powertrain according to claim 11, characterized in that: The second liquid return channel and the first liquid return channel are arranged at intervals in the circumferential direction of the motor shaft.

13. The powertrain according to claim 11 or 12, characterized in that: In the circumferential direction of the motor shaft, an angle between a first connecting line between the first liquid return channel and the motor shaft and a second connecting line between the second liquid return channel and the motor shaft is less than or equal to 90°; The first connecting line is a connecting line between the midpoint of the first liquid return channel in the circumferential direction of the motor shaft and the radial direction of the motor shaft, and the second connecting line is a connecting line between the midpoint of the second liquid return channel in the circumferential direction of the motor shaft and the motor shaft along the radial direction of the motor shaft.

14. The power assembly according to any one of claims 10 to 13, characterized in that: The height of the first liquid return channel in the gravity direction is lower than the height of the second liquid return channel in the gravity direction, and at least a portion of the third liquid outlet overlaps with the first liquid return channel and the second liquid return channel.

15. A vehicle, characterized in that: The vehicle comprises a vehicle body and a powertrain as claimed in any one of claims 1 to 14, wherein the powertrain is mounted on the vehicle body.

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