Power assembly and electric vehicle

Abstract

The embodiment of the utility model provides a power assembly and an electric vehicle, relates to the technical field of vehicles, and aims to solve the problem that the power assembly occupies a large space. An oil outlet hole is formed in the outer side of a shell of the power assembly and used for conveying cooling oil to the heat exchanger. A valve mounting groove is formed in the inner side of the shell and used for mounting an electromagnetic valve. The inner wall of the valve mounting groove comprises a first communicating hole, a second communicating hole and a third communicating hole. The first communicating hole is used for receiving cooling oil output by the oil pump, the second communicating hole is used for communicating with the oil outlet hole, the third communicating hole is used for outputting the cooling oil, and the electromagnetic valve is used for adjusting the flow of the cooling oil received by the first communicating hole from the oil pump and entering at least one of the second communicating hole and the third communicating hole. The valve mounting groove and the electromagnetic valve are made to contain the inner side of the shell of the power assembly, connecting pieces between the electromagnetic valve and an oil pump, an oil outlet hole and a part receiving cooling oil from a third communication hole are omitted, and miniaturization and light weight of the power assembly are facilitated.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of vehicles, in particular to a power assembly and an electric vehicle. BACKGROUND

[0002] In a vehicle, the driving motor, the reducer and other components of the power assembly need to be cooled and lubricated by lubricating oil (such as engine oil). In actual application, an oil cooling circuit is usually provided for the driving motor and the reducer to enable the driving motor and the reducer to operate safely at a suitable temperature. However, at present, the oil cooling circuit of the electric motor and the reducer has defects such as complex pipeline connection, difficult arrangement, large number of parts, difficult assembly and large occupied space. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a power assembly and an electric vehicle, aiming to reduce the occupied space of the power assembly.

[0004] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0005] According to a first aspect, embodiments of the present application provide a power assembly. The inner side of the shell of the power assembly is used to accommodate the driving motor and the reducer of the power assembly, and the outer side of the shell is used to fix the heat exchanger and the oil pump of the power assembly. The heat exchanger is used to exchange heat with the cooling oil, and the oil pump is used to drive the flow of the cooling oil.

[0006] The outer side of the shell includes an oil outlet hole, and the inner side of the shell includes a valve mounting groove. The oil outlet hole is used to deliver the cooling oil to the heat exchanger, and the valve mounting groove is used to install the electromagnetic valve. The inner wall of the valve mounting groove includes a first communication hole, a second communication hole and a third communication hole. The first communication hole is used to receive the cooling oil output by the oil pump, the second communication hole is used to communicate with the oil outlet hole, and the third communication hole is used to output the cooling oil. The electromagnetic valve is used to adjust the flow of the cooling oil received by the first communication hole from the oil pump into at least one of the second communication hole and the third communication hole.

[0007] In the power assembly given in the present application, the cooling oil output by the oil pump enters the valve mounting groove through the first communication hole. The electromagnetic valve is used to adjust the flow of the cooling oil received by the first communication hole from the oil pump into at least one of the second communication hole and the third communication hole, so as to adjust the temperature of the cooling oil in the power assembly, thereby being suitable for different working conditions of the power assembly. Since the valve mounting groove is located on the inner side of the shell, and the electromagnetic valve is installed in the valve mounting groove, the electromagnetic valve is also accommodated in the shell of the power assembly. Compared with the electromagnetic valve being independent of the shell of the power assembly, the electromagnetic valve is accommodated in the shell of the power assembly, the structure of the power assembly is more compact, the size of the power assembly is smaller, and the occupied space of the power assembly is reduced.

[0008] In addition, since the first communication hole, the second communication hole and the third communication hole are arranged on the inner wall of the valve mounting groove, the first communication hole is used for receiving the cooling oil output by the oil pump, and at least part of the flow channel between the oil pump and the electromagnetic valve is also located in the housing of the power assembly. Similarly, the second communication hole is used for communicating with the oil outlet hole, and at least part of the flow channel between the electromagnetic valve and the oil outlet hole is also located in the housing of the power assembly. The third communication hole is used for outputting the cooling oil, and at least part of the flow channel between the third communication hole and the component receiving the cooling oil from the third communication hole is also located in the housing of the power assembly. At least part of the flow channel between the electromagnetic valve and the oil pump, the oil outlet hole, and the component receiving the cooling oil from the third communication hole is located in the housing of the power assembly, which further reduces the size and space occupation of the power assembly, and also reduces the weight of the power assembly, thereby facilitating the miniaturization and light weight of the power assembly.

[0009] In some embodiments, the third communication hole is used for outputting the cooling oil to the drive motor. The temperature of the cooling oil entering the drive motor is adjusted by the electromagnetic valve to adapt to different working conditions of the drive motor, which is beneficial to reduce the power consumption of the power assembly.

[0010] In the scenario that the drive motor is in a high-temperature environment or the heat generation of the drive motor is high, the flow of the cooling oil from the first communication hole into the second communication hole is increased by adjusting the electromagnetic valve. The heat exchanger is used for heat exchange of the cooling oil entering the heat exchanger, so as to reduce the temperature of the cooling oil entering the drive motor, and the heat exchange amount between the cooling oil and the drive motor is increased, so as to improve the cooling efficiency of the cooling oil on the drive motor.

[0011] In the scenario that the drive motor is in a low-temperature environment or the heat generation of the drive motor is low, the flow of the cooling oil from the first communication hole into the third communication hole is increased by adjusting the electromagnetic valve. Since the cooling oil is not subjected to heat exchange by the heat exchanger, the heat exchange amount between the cooling oil and the drive motor is reduced, the temperature of the cooling oil entering the drive motor is higher, and the cooling oil is ensured to be in a temperature range with good fluidity, so as to reduce the frictional resistance of the cooling oil.

[0012] In some embodiments, the third communication hole is used for outputting the cooling oil to the speed reducer to adapt to different working conditions of the speed reducer, which is beneficial to reduce the power consumption of the power assembly.

[0013] In the scenario that the speed reducer is in a high-temperature environment or the heat generation of the speed reducer is high, the flow of the cooling oil from the first communication hole into the second communication hole is increased by adjusting the electromagnetic valve. The heat exchanger is used for heat exchange of the cooling oil entering the heat exchanger, so as to reduce the temperature of the cooling oil entering the speed reducer, and the heat exchange amount between the cooling oil and the speed reducer is increased, so as to improve the cooling efficiency of the cooling oil on the speed reducer.

[0014] In the scenario that the reducer is in a low-temperature environment or the heat generated by the reducer is low, the flow of the cooling oil from the first communication hole into the third communication hole is increased by adjusting the electromagnetic valve. Since the cooling oil is not heated by the heat exchanger, the heat exchange between the cooling oil and the reducer is reduced, and the oil temperature of the cooling oil entering the reducer is higher, which ensures that the cooling oil remains within the temperature range with good fluidity to reduce the frictional resistance of the cooling oil.

[0015] In other embodiments, the third communication hole is used to output cooling oil to the driving motor and the reducer respectively, so as to be suitable for different working conditions of the driving motor and the reducer, and to reduce the power consumption of the power assembly. The principles and advantages of the third communication hole outputting cooling oil to the driving motor and the third communication hole outputting cooling oil to the reducer in different working conditions have been described above, and will not be repeated here.

[0016] In an embodiment, the housing of the power assembly includes an integrated housing, a reducer end cover and a motor end cover. The integrated housing includes a motor slot and a reducer slot. The reducer end cover is used to enclose the reducer slot to form a reducer cavity. The motor end cover is used to enclose the motor slot to form a motor cavity. The motor cavity is used to accommodate the driving motor. The reducer cavity is used to accommodate the reducer.

[0017] The valve mounting slot is distributed on the inner side of the reducer slot, and the oil outlet hole is distributed on the outer side of the reducer slot.

[0018] The reducer end cover encloses the reducer slot to form a reducer cavity. The reducer is accommodated in the reducer cavity, which not only plays a protective role such as dustproof and waterproof for the reducer, but also makes the installation, disassembly and maintenance of the reducer more convenient and convenient. Moreover, the setting of the reducer end cover provides more support positions and mounting positions for the reducer, ensuring the stability and safety of the reducer.

[0019] Similarly, the motor end cover encloses the motor slot to form a motor cavity. The driving motor is accommodated in the motor cavity, which not only plays a protective role such as dustproof and waterproof for the driving motor, but also makes the installation, disassembly and maintenance of the driving motor more convenient and convenient. Moreover, the setting of the motor end cover provides support and fixing functions for the rotor and bearing of the driving motor, ensuring that the stator and rotor of the driving motor maintain a certain gap, thereby ensuring the stable operation of the driving motor.

[0020] The valve mounting slot is distributed on the inner side of the reducer slot, which makes use of the inner side space of the reducer slot, so that the valve mounting slot and the electromagnetic valve mounted in the valve mounting slot are arranged more compactly with other parts of the power assembly. Therefore, the size and occupied space of the power assembly are further reduced.

[0021] Since the heat exchanger is fixed outside the housing of the power assembly, the oil outlet hole is distributed outside the reduction gear groove, which is convenient for the connection between the heat exchanger and the oil outlet hole, simplifies the connection structure between the heat exchanger and the oil outlet hole, reduces the number of parts, reduces the assembly process, saves space, and makes the power assembly more compact and integrated, so that the lightweight degree and miniaturization degree of the power assembly are further improved.

[0022] In an embodiment, the interior of the integrated housing includes a first housing interior flow channel for receiving the cooling oil output by the oil pump and for outputting the cooling oil through the first communication hole. The first housing interior flow channel is distributed outside the motor groove, and the inner diameter of the first housing interior flow channel is smaller than the inner diameter of the valve mounting groove.

[0023] The first housing interior flow channel is arranged to utilize the interior space of the integrated housing, save the external connection pipeline between the oil pump and the first communication hole, reduce the number of parts of the power assembly, make the structure of the power assembly more compact, occupy less space, and reduce the weight of the integrated housing, which is conducive to the miniaturization and lightweight of the power assembly.

[0024] The inner diameter of the first housing interior flow channel is smaller than the inner diameter of the valve mounting groove. The inner diameter of the first housing interior flow channel is small, so the flow rate of the cooling oil in the first housing interior flow channel is high, the flow rate is increased, the heat exchange amount between the cooling oil and the inner wall of the first housing interior flow channel is increased, the heat exchange efficiency of the cooling oil is increased, the temperature of the cooling oil is reduced, and the energy consumption of the power assembly is reduced. In addition, the increased flow rate reduces the accumulation amount of the deposits in the cooling oil in the first housing interior flow channel, preventing the formation and accumulation of the deposits in the cooling oil.

[0025] The first housing interior flow channel is distributed inside the motor groove, the cooling oil in the first housing interior flow channel exchanges heat with the motor groove, the heat exchange amount between the driving motor and the cooling oil is increased, so the heat dissipation efficiency of the driving motor located in the motor groove is further improved, which is conducive to reducing the energy consumption of the power assembly.

[0026] In an embodiment, the inner side of the reduction gear groove includes one or more lubrication holes, each of which is used to receive the cooling oil delivered by the first housing interior flow channel and to deliver the cooling oil to the reduction gear. The opening direction of the lubrication hole is the same as the opening direction of the valve mounting groove and the opening direction of the reduction gear groove.

[0027] The cooling oil flows from the first housing interior flow channel to the lubrication hole. Since the lubrication hole is located inside the reduction gear groove, and the opening direction of the lubrication hole is the same as the opening direction of the valve mounting groove and the opening direction of the reduction gear groove, the cooling oil is more directly and quickly delivered to the position that needs to be lubricated, reducing the loss of the cooling oil during the delivery process, improving the lubrication efficiency, and reducing the lubrication cost.

[0028] In addition, the communication between the lubricating hole and the first housing internal flow channel saves additional pipelines and connectors, reduces the complexity of the oil cooling circuit inside the power assembly, and helps to achieve a more compact structure design of the power assembly.

[0029] In one embodiment, each lubricating hole is configured to accommodate an oil nozzle, the oil nozzle comprising an oil inlet and an oil outlet, the oil inlet of the oil nozzle being configured to receive the cooling oil delivered by the lubricating hole and to deliver the cooling oil to the oil outlet, the oil outlet being configured to spray the cooling oil to the reducer.

[0030] In this embodiment, the angle between the opening direction of the oil outlet and the opening direction of the lubricating hole is directed towards the reducer, the inner diameter of the oil outlet is smaller than the inner diameter of the lubricating hole, and the inner diameter of the lubricating hole is smaller than the inner diameter of the first housing internal flow channel.

[0031] The cooling oil enters the oil inlet of the oil nozzle from the lubricating hole, and the oil outlet of the oil nozzle sprays the cooling oil to the reducer to lubricate and cool the components such as bearings and gears of the reducer. The active oil spraying mode of the oil nozzle to the reducer is used to cool and lubricate the reducer, so as to achieve more uniform cooling and lubrication effect, prevent local overheating or local lubrication, and improve the reliability of the reducer cooling oil circuit.

[0032] In addition, the active oil spraying mode of the oil nozzle has high flexibility and is suitable for different working environments and requirements. In high temperature working conditions, the temperature of the reducer can be effectively reduced by increasing the spraying amount of the cooling oil. In low temperature working conditions, the reducer can be kept within a stable working temperature range by reducing the spraying amount of the cooling oil.

[0033] In this embodiment, the angle between the opening direction of the oil outlet and the opening direction of the lubricating hole is directed towards the reducer, so as to ensure that the oil outlet is directed towards the reducer and that the cooling oil is sprayed onto the reducer, thereby achieving cooling and lubrication of the reducer.

[0034] The inner diameter of the lubricating hole is smaller than the inner diameter of the first housing internal flow channel, and the inner diameter of the oil outlet is smaller than the inner diameter of the lubricating hole, so as to increase the flow rate of the cooling oil in the lubricating hole, make the flow rate of the cooling oil sprayed from the oil outlet higher, the spraying area larger, and the spraying distance farther, thereby making the cooling oil more uniformly sprayed onto the reducer, further preventing local overheating or local lubrication, and effectively improving the reliability of the reducer cooling oil circuit.

[0035] In one embodiment, the interior of the integrated housing comprises one or more branch flow channels, each branch flow channel being configured to receive the cooling oil delivered by the first housing internal flow channel and to deliver the cooling oil to the lubricating hole.

[0036] The length of the branch flow channel is less than the length of the first shell internal flow channel, and the inner diameter of the branch flow channel is less than the inner diameter of the first shell internal flow channel

[0037] The branch flow channel guides the cooling oil delivered by the first shell internal flow channel to the lubricating hole, so as to cool and lubricate the speed reducer, ensure that the temperature of the cooling oil entering the speed reducer groove is not too low, ensure that the cooling oil has good fluidity, reduce the friction loss between the cooling oil and the gear, transmission shaft and other components, and the power consumption of the power assembly, and prevent the cooling oil temperature from being too low to cause the friction loss between the cooling oil and the gear, transmission shaft and other components to increase.

[0038] In this embodiment, the length of the branch flow channel is less than the length of the first shell internal flow channel, so that the pressure loss of the cooling oil flowing in the branch flow channel is small, the energy consumption of the power assembly is reduced, and the shorter branch flow channel is more convenient for processing and manufacturing.

[0039] The inner diameter of the branch flow channel is less than the inner diameter of the first shell internal flow channel, so that the flow rate of the cooling oil in the branch flow channel is greater than the flow rate of the cooling oil in the first shell internal flow channel, which is beneficial to increase the flow rate, spraying distance and spraying area of the cooling oil sprayed by the oil injection port, and is beneficial to improve the heat dissipation efficiency of the speed reducer.

[0040] In one embodiment, the interior of the integrated shell includes a second shell internal flow channel, the heat exchanger is provided with an oil inlet on the surface of the integrated shell, the second shell internal flow channel is used to receive cooling oil from the second communication hole and output cooling oil through the oil outlet, and the oil inlet of the heat exchanger is used to receive cooling oil from the oil outlet, wherein:

[0041] The second shell internal flow channel is perpendicular to the surface of the valve installation groove and the surface of the heat exchanger, respectively, and the inner diameter of the second shell internal flow channel is less than the inner diameter of the valve installation groove and the inner diameter of the oil inlet of the heat exchanger, respectively.

[0042] The cooling oil enters the second shell internal flow channel from the second communication hole and is delivered to the oil inlet of the heat exchanger through the oil outlet, and the heat exchanger is used to exchange heat with the cooling oil entering the heat exchanger to reduce the temperature of the cooling oil. The second shell internal flow channel makes use of the internal space of the integrated shell, saves the external connecting pipeline between the heat exchanger and the second communication hole, reduces the number of parts of the power assembly, is beneficial to make the structure of the power assembly more compact and occupy less space, and on the other hand, reduces the weight of the integrated shell, which is beneficial to the miniaturization and light weight of the power assembly.

[0043] In this embodiment, the second shell internal flow channel is perpendicular to the slot opening of the valve mounting slot and the surface of the integrated shell towards the heat exchanger, so that the distance between the second shell internal flow channel and the heat exchanger is the shortest, and the distance between the second shell internal flow channel and the valve mounting slot is the shortest, the shortest flow path is used to transport the cooling oil, the pressure loss of the cooling oil is reduced, the energy consumption is reduced, and the machining and manufacturing of the second shell internal flow channel on the integrated shell are facilitated.

[0044] The inner diameter of the second shell internal flow channel is smaller than the inner diameter of the valve mounting slot, which increases the flow rate of the cooling oil entering the second shell internal flow channel, so that the cooling oil enters the second shell internal flow channel quickly and enters the heat exchanger along the second shell internal flow channel for cooling, which is beneficial to shorten the heat exchange time and improve the heat exchange efficiency. The inner diameter of the second shell internal flow channel is smaller than the inner diameter of the oil inlet of the heat exchanger, so that the flow rate of the cooling oil entering the heat exchanger is reduced, thereby ensuring that the cooling oil is more effectively cooled in the heat exchanger, and ensuring that the cooling oil output from the heat exchanger is in a low-temperature state.

[0045] In some embodiments, the flow of the cooling oil entering the heat exchanger is controlled by adjusting the electromagnetic valve, so as to change the temperature of the cooling oil output from the heat exchanger (the temperature of the cooling oil entering the power assembly) to adapt to different working conditions.

[0046] In an embodiment, the interior of the integrated shell includes a third shell internal flow channel, the third shell internal flow channel is used to receive the cooling oil output from at least one of the heat exchanger and the third communication hole and to deliver the cooling oil to the drive motor. The third shell internal flow channel is perpendicular to the slot opening of the valve mounting slot, and the inner diameter of the third shell internal flow channel is smaller than the inner diameter of the valve mounting slot.

[0047] In the scenario where the power assembly is in a high-temperature environment or the drive motor generates a high amount of heat, the third shell internal flow channel is used to receive the cooling oil output from the heat exchanger, so that the cooling oil entering the third shell internal flow channel is all the cooling oil cooled by the heat exchanger. The lower the temperature of the cooling oil, the greater the heat exchange between the cooling oil and the drive motor, and the higher the heat dissipation efficiency of the drive motor.

[0048] In the scenario where the power assembly is in a low-temperature environment or the drive motor generates a low amount of heat, the third shell internal flow channel is used to receive the cooling oil output from the third communication hole, so that the cooling oil entering the third shell internal flow channel is not cooled by the heat exchanger, the temperature of the cooling oil is relatively high, the heat exchange between the cooling oil and the drive motor is relatively small, the cooling efficiency of the drive motor is reduced, and the working temperature of the drive motor is ensured.

[0049] In other embodiments, the third shell internal flow channel is used to receive the cooling oil output from the heat exchanger and the cooling oil output from the third communication hole, for use in other different scenarios.

[0050] In this embodiment, the third internal flow channel of the third shell is perpendicular to the slot of the valve installation slot, so that the distance between the third internal flow channel of the third shell and the valve installation slot is the shortest, the shortest flow path is used to transport the cooling oil, the pressure loss of the cooling oil is reduced, the energy consumption is reduced, and the machining and manufacturing of the third internal flow channel of the third shell on the integrated shell are facilitated.

[0051] The inner diameter of the third internal flow channel of the third shell is smaller than the inner diameter of the valve installation slot, so that the flow rate of the cooling oil entering the third internal flow channel of the third shell is increased, the cooling oil quickly enters the third internal flow channel of the third shell, and flows out along the third internal flow channel of the third shell, so as to ensure the flow rate of the cooling oil and the heat exchange efficiency of the cooling oil to the driving motor.

[0052] In one embodiment, the outer side of the integrated shell further comprises an oil inlet hole for receiving the cooling oil after heat exchange in the heat exchanger, and the third internal flow channel is used to receive the cooling oil after heat exchange in the heat exchanger from the oil inlet hole through the fourth internal flow channel of the fourth shell, wherein:

[0053] The fourth internal flow channel of the fourth shell is perpendicular to the third internal flow channel of the third shell and the heat exchanger respectively, and the inner diameter of the fourth internal flow channel is greater than the inner diameter of the oil outlet of the heat exchanger.

[0054] The cooling oil enters the oil inlet hole from the oil outlet of the heat exchanger and enters the third internal flow channel of the third shell through the fourth internal flow channel of the fourth shell. The fourth internal flow channel of the fourth shell utilizes the internal space of the integrated shell on the one hand, saves the external connecting pipeline between the heat exchanger and the oil inlet hole, reduces the number of parts of the power assembly, and is conducive to making the structure of the power assembly more compact and occupying less space. On the other hand, the weight of the integrated shell is reduced, which is conducive to the miniaturization and light weight of the power assembly.

[0055] In this embodiment, the fourth internal flow channel of the fourth shell is perpendicular to the third internal flow channel of the third shell and the heat exchanger respectively, so that the distance between the third internal flow channel of the third shell and the heat exchanger is the shortest, the distance between the fourth internal flow channel of the fourth shell and the third internal flow channel of the third shell is the shortest, the shortest flow path is used to transport the cooling oil, the pressure loss of the cooling oil is reduced, the energy consumption is reduced, and the machining and manufacturing of the fourth internal flow channel of the fourth shell on the integrated shell are facilitated.

[0056] The inner diameter of the fourth internal flow channel of the fourth shell is greater than the inner diameter of the oil outlet of the heat exchanger, so that the flow rate of the cooling oil entering the fourth internal flow channel of the fourth shell is reduced, the impact force of the cooling oil on the integrated shell is reduced, and the heat exchange time of the cooling oil is increased, thereby improving the heat exchange efficiency. The length of the fourth internal flow channel of the fourth shell is smaller than the length of the third internal flow channel of the third shell, so that the pressure loss of the cooling oil flowing in the fourth internal flow channel of the fourth shell is smaller, the energy consumption of the power assembly is reduced, and the shorter fourth internal flow channel is more convenient for machining and manufacturing.

[0057] In one embodiment, the inner side of the motor slot comprises one or more first cooling holes, each of which is configured to receive the cooling oil delivered by the third inner flow channel of the shell and to deliver the cooling oil to the stator of the driving motor. The opening of the first cooling hole is directed towards the axial direction perpendicular to the driving motor, and the inner diameter of the first cooling hole is smaller than the inner diameter of the third inner flow channel of the shell.

[0058] The cooling oil delivered by the third inner flow channel of the shell is delivered to the first cooling hole, and the first cooling hole delivers the cooling oil to the stator of the driving motor to cool the stator of the driving motor.

[0059] In this embodiment, the opening of the first cooling hole is directed towards the axial direction perpendicular to the driving motor, so that the cooling oil enters the stator of the driving motor in a direction perpendicular to the axial direction of the driving motor, ensuring the cooling efficiency of the stator. The inner diameter of the first cooling hole is smaller than the inner diameter of the third inner flow channel of the shell, which on the one hand facilitates the smooth entry of the cooling oil in the first cooling hole into the stator of the driving motor, and on the other hand increases the flow rate of the cooling oil entering the driving motor, thereby improving the cooling efficiency of the cooling oil on the stator of the driving motor.

[0060] In some embodiments, the integrated shell further comprises a fifth inner flow channel of the shell, which is configured to receive the cooling oil delivered by the third inner flow channel of the shell and to deliver the cooling oil to the first cooling hole.

[0061] The provision of the fifth inner flow channel of the shell on the one hand makes use of the internal space of the integrated shell, saves the external connecting pipeline between the first cooling hole and the third inner flow channel of the shell, reduces the number of parts of the power assembly, and is conducive to making the structure of the power assembly more compact and occupying less space, and on the other hand reduces the weight of the integrated shell, which is conducive to the miniaturization and light weight of the power assembly.

[0062] In one embodiment, the reducer end cover comprises one or more second cooling holes, each of which is configured to receive the cooling oil delivered by the third inner flow channel of the shell and to deliver the cooling oil to the rotor of the driving motor. The opening of the second cooling hole is directed towards the axial direction perpendicular to the driving motor, and the inner diameter of the second cooling hole is smaller than the inner diameter of the third inner flow channel of the shell.

[0063] The cooling oil delivered by the third inner flow channel of the shell is delivered to the second cooling hole, and the second cooling hole delivers the cooling oil to the rotor of the driving motor to cool the rotor of the driving motor.

[0064] In this embodiment, the opening of the second cooling hole is oriented towards the axial direction perpendicular to the drive motor, so that the cooling oil enters the rotor of the drive motor in a direction perpendicular to the axial direction of the drive motor, ensuring the cooling efficiency of the rotor. The inner diameter of the second cooling hole is smaller than the inner diameter of the third housing internal flow channel, on the one hand facilitating the smooth entry of the cooling oil of the second cooling hole into the rotor of the drive motor, and on the other hand improving the flow rate of the cooling oil entering the drive motor, so as to improve the cooling efficiency of the cooling oil on the rotor of the drive motor.

[0065] In an embodiment, the inside of the reducer end cover comprises an end cover internal flow channel, which is used to receive the cooling oil delivered by the third housing internal flow channel and to deliver the cooling oil to the second cooling hole.

[0066] The provision of the end cover internal flow channel, on the one hand, utilizes the internal space of the integrated housing, saves the external connecting pipeline between the second cooling hole and the third housing internal flow channel, reduces the number of parts of the power assembly, and is conducive to making the structure of the power assembly more compact and occupying less space, and on the other hand, reduces the weight of the integrated housing, which is conducive to the miniaturization and light weight of the power assembly.

[0067] In some embodiments, the integrated housing further comprises a sixth housing internal flow channel, which is used to receive the cooling oil delivered by the third housing internal flow channel and to deliver the cooling oil to the end cover internal flow channel.

[0068] The provision of the sixth housing internal flow channel, on the one hand, utilizes the internal space of the integrated housing, saves the external connecting pipeline between the end cover internal flow channel and the third housing internal flow channel, reduces the number of parts of the power assembly, and is conducive to making the structure of the power assembly more compact and occupying less space, and on the other hand, reduces the weight of the integrated housing, which is conducive to the miniaturization and light weight of the power assembly.

[0069] In an embodiment, the integrated housing further comprises an oil pump groove and a fine filter groove, the oil pump groove is used to install an oil pump, and the fine filter groove is used to install a fine filter, to

[0070] receive the cooling oil output by the oil pump and deliver the cooling oil to the fine filter, and the fine filter is used to filter the cooling oil.

[0071] Among them, the slot opening direction of the motor slot and the slot opening direction of the reducer slot are opposite along the axial direction of the drive motor, the slot opening direction of the valve mounting slot is the same as the slot opening direction of the reducer slot, the slot opening direction of the oil pump groove is the same as the slot opening direction of the motor slot, and the slot opening direction of the fine filter groove is perpendicular to the slot opening direction of the oil pump groove.

[0072] The fine filter tank is used for receiving the cooling oil output by the oil pump and for delivering the cooling oil to the fine filter, which is used for filtering the cooling oil. Therefore, the fine filter is used for filtering the cooling oil flowing out of the oil pump to filter the fine metal particles, oil sludge and other impurities in the cooling oil, to ensure the cleanliness of the cooling oil, to prevent the impurities from entering the drive motor, the speed reducer and other components or pipelines to cause abrasion, jamming or failure, and to improve the reliability and durability of the oil cooling circuit inside the power assembly.

[0073] In this embodiment, the slot opening direction of the motor slot and the slot opening direction of the speed reducer slot are opposite along the axial direction of the drive motor. When being installed, the drive motor is installed in the motor slot along one end of the axial direction of the drive motor, and the speed reducer is installed in the speed reducer slot along the other end of the axial direction of the drive motor. When being disassembled, the drive motor and the speed reducer are respectively dismounted along the two ends of the axial direction of the drive motor, which is convenient and does not interfere with each other, and is easy to operate.

[0074] The slot opening direction of the valve mounting slot is the same as the slot opening direction of the speed reducer slot, which is convenient for installing the electromagnetic valve. Moreover, since the speed reducer slot has a large size along the axial direction of the drive motor, the slot opening direction of the valve mounting slot is the same as the slot opening direction of the speed reducer slot, which utilizes the size of the speed reducer slot along the axial direction of the drive motor, and improves the space utilization rate of the speed reducer slot.

[0075] The slot opening direction of the oil pump slot is the same as the slot opening direction of the motor slot, which is convenient for installing the oil pump on one hand, and utilizes the space between the motor slot and the speed reducer slot on the other hand, so that the structure of the power assembly is more compact and integrated.

[0076] The slot opening direction of the fine filter tank is perpendicular to the slot opening direction of the oil pump slot, which more effectively utilizes the size in the direction perpendicular to the slot opening direction of the oil pump slot, so that the power assembly is more compact and occupies less space. In addition, since the fine filter needs to be replaced and maintained regularly, and the oil pump needs to be electrically connected to the controller and other components to ensure the reliability and stability of the oil cooling circuit inside the power assembly, the slot opening direction of the fine filter tank is perpendicular to the slot opening direction of the oil pump slot, which helps to dismount the oil pump and the fine filter respectively, and makes it easier to troubleshoot and repair.

[0077] In one embodiment, the integrated housing further comprises an oil discharge hole and a coarse filter tank. The oil discharge hole is used for receiving the cooling oil of at least one of the speed reducer slot and the motor slot and for delivering the cooling oil to the coarse filter tank. The coarse filter tank is used for installing a coarse filter, for receiving the cooling oil delivered by the oil discharge hole and for delivering the cooling oil to the coarse filter. The coarse filter is used for filtering the cooling oil and for delivering the cooling oil to the oil pump slot.

[0078] In this embodiment, the oil discharge hole is distributed on the inner side of the speed reducer slot. The opening direction of the oil discharge hole and the slot opening direction of the speed reducer slot are opposite along the axial direction of the drive motor. The opening direction of the oil discharge hole, the slot opening direction of the coarse filter tank and the slot opening direction of the oil pump slot are the same.

[0079] The cooling oil in the reducer groove flows to the oil discharge hole, and is transported to the coarse filter groove through the oil discharge hole. The coarse filter in the coarse filter groove is used to filter the cooling oil to filter out impurities such as large particles of dust, metal chips and the like in the cooling oil, to protect the oil pump from damage by large particles of impurities, to prevent the oil pump from being blocked or worn, thereby prolonging the service life of the oil pump. The cooling oil filtered by the coarse filter is transported to the oil pump groove to pump the cooling oil into the corresponding components or flow channels through the oil pump groove.

[0080] In this embodiment, the oil discharge holes are distributed on the inner side of the reducer groove, facilitating the discharge of the cooling oil in the reducer groove. The opening direction of the oil discharge hole and the direction of the slot opening of the reducer groove are opposite along the axial direction of the drive motor. By setting the installation position of the power assembly, the cooling oil in the reducer groove is collected at the oil discharge hole and discharged from the reducer groove. The opening direction of the oil discharge hole, the direction of the slot opening of the coarse filter groove and the direction of the slot opening of the oil pump groove are the same, so the direction of the slot opening of the coarse filter groove and the direction of the slot opening of the oil pump groove are opposite to the direction of the slot opening of the reducer groove. Since the direction of the slot opening of the motor groove and the direction of the slot opening of the reducer groove are opposite, the opening direction of the oil discharge hole, the direction of the slot opening of the coarse filter groove and the direction of the slot opening of the oil pump groove are the same. The space between the reducer groove and the motor groove is utilized to make the structure of the power assembly more compact and integrated, so that the degree of lightweight and miniaturization of the power assembly is further improved.

[0081] In some embodiments, the coarse filter groove and the oil pump groove are coaxially arranged and communicated, saving the connection structure between the coarse filter groove and the oil pump groove, reducing the number, size and occupied space of parts, and reducing the assembly process of the power assembly, which is conducive to the lightweight and miniaturization of the power assembly.

[0082] In some embodiments, the coarse filter groove and the oil discharge hole are communicated, saving the connection structure between the oil discharge hole and the coarse filter groove, reducing the number, size and occupied space of parts, and reducing the assembly process of the power assembly, which is conducive to the lightweight and miniaturization of the power assembly.

[0083] According to a second aspect, the embodiments of the present application provide an electric vehicle, which comprises a wheel and the power assembly described above, and the power assembly is used to drive the wheel.

[0084] The power assembly drives the wheel to rotate, and further makes the electric vehicle travel. In addition, the electric vehicle provided by the present application comprises the power assembly described above, so the electric vehicle provided by the present application solves the same technical problems and has the same technical effects as the power assembly described above, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0085] In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in some embodiments of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some drawings of the embodiments of the present application, and other drawings can be obtained by those skilled in the art according to these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limited to the actual size, actual process, actual timing of signals, etc. of the products involved in the embodiments of the present application.

[0086] Figure 1 A structural schematic diagram of an electric vehicle provided by an embodiment of the present application;

[0087] Figure 2 A structural schematic diagram of a power assembly provided by an embodiment of the present application;

[0088] Figure 3 An exploded view of a housing of the power assembly in Figure 2 , showing a reducer, a drive motor and a heat exchanger;

[0089] Figure 4 An oil cooling circuit schematic diagram of a power assembly provided by an embodiment of the present application;

[0090] Figure 5 A partial structural schematic diagram of an integrated housing provided by an embodiment of the present application;

[0091] Figure 6 A partial structural schematic diagram of an integrated housing provided by an embodiment of the present application;

[0092] Figure 7 A partial sectional view of an integrated housing provided by an embodiment of the present application;

[0093] Figure 8 A partial sectional view of an integrated housing provided by an embodiment of the present application;

[0094] Figure 9 A partial sectional view of an integrated housing provided by an embodiment of the present application;

[0095] Figure 10 A partial sectional view of an integrated housing provided by an embodiment of the present application;

[0096] Figure 11 A partial sectional view of a reducer end cover provided by an embodiment of the present application, showing an integrated housing.

[0097] Explanation of reference signs:

[0098] 1000 - electric vehicle; 100 - power assembly; 200 - wheel; 300 - power battery; 400 - vehicle body;

[0099] 10 - motor; 101 - stator; 102 - rotor;

[0100] 20 - reducer; 201 - input shaft; 202 - intermediate shaft; 203 - output shaft;

[0101] 30 - heat exchanger; 301 - cooling water inlet; 302 - cooling water outlet; 303 - first oil inlet; 304 - first oil outlet;

[0102] 40 - housing; 50 - electromagnetic valve; 60 - oil nozzle; 601 - second oil inlet; 602 - oil injection port; 70 - oil pump; 80 - coarse filter; 90 - fine filter;

[0103] 1 - integrated housing; 11 - motor slot; 12 - reducer slot; 13 - valve mounting slot; 131 - first communication hole; 132 - second communication hole; 133 - third communication hole; 141 - oil outlet hole; 142 - oil inlet hole; 143 - oil discharge hole; 151 - first bearing cavity; 152 - second bearing cavity; 153 - third bearing cavity; 16 - lubrication hole; 171 - first cooling hole; 172 - second cooling hole; 181 - coarse filter groove; 182 - fine filter groove; 183 - oil pump groove;

[0104] 01 - first housing internal flow passage; 02 - second housing internal flow passage; 03 - third housing internal flow passage; 04 - fourth housing internal flow passage; 05 - communication flow passage; 06 - branch flow passage; 07 - fifth housing internal flow passage; 08 - sixth housing internal flow passage; 09 - end cover internal flow passage;

[0105] 2 - reducer end cover; 3 - motor end cover; 4 - reducer cavity; 5 - motor cavity. DETAILED DESCRIPTION

[0106] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0107] In the present application, the terms "first", "second", etc. are only for the purpose of description, in order to distinguish one element from another element, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second", etc. explicitly or implicitly include one or more of the features.

[0108] In the present application, unless otherwise explicitly specified and limited, the meaning of "multiple" is two or more.

[0109] In the drawings of the embodiments of the present application, the entity structures of components, assemblies, etc. are represented by guide lines; the hollow structures of openings, holes, spaces, cavities, etc. are represented by guide lines with arrows.

[0110] The electric vehicle provided by the embodiments of the present application is a wheeled device driven or towed by a power device. In some embodiments, the electric vehicle is a battery electric vehicle (BEV). In other embodiments, the electric vehicle is a hybrid electric vehicle (HEV). The specific form of the electric vehicle is not limited in the present application.

[0111] Figure 1 A structural schematic diagram of an electric vehicle is shown. Referring to Figure 1 , the electric vehicle 1000 includes a vehicle body 400, vehicle wheels 200, a power battery 300, and a power assembly 100. The power assembly 100 and the power battery 300 are fixed to the vehicle body 400. The power battery 300 supplies power to the power assembly 100, and the power assembly 100 drives the vehicle wheels 200 to rotate, thereby enabling the electric vehicle 1000 to travel.

[0112] Referring to Figure 1 , the power assembly 100 drives the rear wheels (the wheels close to the tail side) of the electric vehicle 1000 to rotate, so as to drive the electric vehicle 1000 to travel.

[0113] In other embodiments, the power assembly 100 drives the front wheels (the wheels close to the head side) of the electric vehicle 1000 to rotate, so as to drive the electric vehicle 1000 to travel. The embodiments of the present application do not have special restrictions on this.

[0114] Figure 2 A structural schematic diagram of a power assembly applied to the above electric vehicle is shown. Figure 3 An exploded view of the housing of the power assembly in Figure 2 is shown. Referring to Figure 2 and Figure 3 , the power assembly 100 includes a housing 40, a driving motor 10, and a speed reducer 20. The driving motor 10 and the speed reducer 20 are accommodated inside the housing 40.

[0115] Among them, referring to Figure 2 and Figure 3 , the housing 40 of the power assembly 100 includes an integrated housing 1, a speed reducer end cover 2, and a motor end cover 3. The integrated housing 1 includes a speed reducer groove 12 and a motor groove 11 (as shown in Figure 2The reducer end cover 2 encloses the reducer slot 12 to form a reducer cavity 4, and the reducer 20 is accommodated in the reducer cavity 4. The motor end cover 3 encloses the motor slot 11 to form a motor cavity 5, and the driving motor 10 is accommodated in the motor cavity 5.

[0116] The reducer end cover 2 encloses the reducer slot 12 to form a reducer cavity 4, and the reducer 20 is accommodated in the reducer cavity 4. The motor end cover 3 encloses the motor slot 11 to form a motor cavity 5, and the driving motor 10 is accommodated in the motor cavity 5.

[0117] The motor end cover 3 encloses the motor slot 11 to form a motor cavity 5, and the driving motor 10 is accommodated in the motor cavity 5. At the same time, the motor end cover 3 plays a protective role of dustproof, waterproof and the like for the driving motor 10, and makes the installation, disassembly and maintenance of the driving motor 10 more convenient and convenient. And the setting of the motor end cover 3 provides support and fixing effect for the rotor and bearing of the driving motor 10, ensures that the stator and rotor of the driving motor 10 maintain a certain gap, thereby ensuring the stable operation of the driving motor 10.

[0118] In some embodiments, the slot opening direction of the motor slot 11 and the slot opening direction of the reducer slot 12 are opposite along the axial direction of the driving motor 10. When installing, the driving motor 10 is installed in the motor slot 11 along one end of the axial direction of the driving motor 10, and the reducer 20 is installed in the reducer slot 12 along the other end of the axial direction of the driving motor 10. When disassembling, the driving motor 10 and the reducer 20 are respectively removed along the two ends of the axial direction of the driving motor 10, which is convenient to disassemble and does not interfere with each other, and is convenient to operate.

[0119] The driving motor 10 drives the wheels of the vehicle through the reducer 20. Referring to Figure 3 The reducer 20 includes an input shaft 201, an intermediate shaft 202 and an output shaft 203. The motor shaft of the driving motor 10 is in transmission connection with the input shaft 201 of the reducer 20, and the output shaft 203 of the reducer 20 is used for transmission connection with the wheel 200. The input shaft 201, the intermediate shaft 202 and the output shaft 203 are all provided with gears, and the gears of the input shaft 201, the gears of the intermediate shaft 202 and the gears of the output shaft 203 are in transmission connection in sequence. The driving motor 10 is used for generating power, and the power output by the driving motor 10 is transmitted along the input shaft 201, the intermediate shaft 202 and the output shaft 203 of the reducer 20, and is transmitted to the wheel through the output shaft 203 to drive the wheel to rotate.

[0120] Figure 4 A schematic diagram of an oil cooling circuit structure of a power assembly is shown. Referring to Figure 4The power assembly 100 comprises an oil pump 70 for providing kinetic energy to the cooling oil in the reducer groove 12, and delivering the cooling oil to the heat exchanger 30, the drive motor 10 and the reducer 20. The cooling oil is delivered to the drive motor 10 and the reducer 20 for cooling and lubricating the drive motor 10 and the reducer 20. The cooling oil is delivered to the heat exchanger 30 for heat exchange with the cooling oil to reduce the temperature of the cooling oil.

[0121] In some embodiments, referring to Figure 4 The motor groove 11 and the reducer groove 12 are communicated through a communication flow channel 05. The cooling oil in the motor groove 11 flows into the communication flow channel 05, and flows along the communication flow channel 05 to the reducer groove 12. The inlet of the communication flow channel 05 is communicated with the motor groove 11 for receiving the cooling oil in the motor groove 11, and the outlet of the communication flow channel 05 is communicated with the reducer groove 12 for delivering the cooling oil to the reducer groove 12.

[0122] Referring to Figure 4 The reducer groove 12 comprises a drain hole 143, and the cooling oil in the reducer groove 12 (including the cooling oil flowing from the motor groove 11 to the reducer groove 12) is drained from the reducer groove 12 through the drain hole 143.

[0123] In the embodiment shown in Figure 4 The power assembly 100 further comprises an oil pump 70 for pumping the cooling oil in the reducer groove 12 into the first housing internal flow channel 01 to drive the cooling oil to flow. The provision of the oil pump 70 increases the pressure and flow rate of the cooling oil, ensures the stability of the pressure of the cooling oil, and delivers the cooling oil to the heat exchanger 30, the drive motor 10 and the reducer 20 through the first housing internal flow channel 01. In some embodiments, the flow rate and pressure of the output cooling oil are adjusted by the oil pump 70 to meet the requirements under different working conditions.

[0124] Referring to Figure 4 The power assembly 100 further comprises a coarse filter 80 for filtering the cooling oil flowing into the oil pump 70 to filter the large-particle dust, metal debris and other impurities in the cooling oil, protecting the oil pump 70 from damage by large-particle impurities, preventing the oil pump 70 from being clogged or worn, thereby prolonging the service life of the oil pump 70.

[0125] In addition, the power assembly 100 further comprises a fine filter 90 for filtering the cooling oil flowing out of the oil pump 70 to filter the small-particle metal particles, oil sludge and other impurities in the cooling oil, ensuring the cleanliness of the cooling oil, preventing impurities from entering the drive motor 10, the reducer 20 and other components or pipelines, causing wear, jamming or failure, thereby improving the reliability and durability of the oil cooling circuit.

[0126] The forms of the coarse filter 80 and the fine filter 90 are various, and in some embodiments, the coarse filter 80 is a centrifugal coarse filter or an inertial coarse filter, and the fine filter 90 is a surface filtration fine filter or a deep filtration fine filter. The specific form of the coarse filter 80 and the fine filter 90 is not limited in the present application.

[0127] Referring to Figure 4 The cooling oil transported by the first housing internal flow channel 01 flows into the branch flow channel 06 and the valve mounting groove 13. The cooling oil flowing into the branch flow channel 06 is transported along the branch flow channel 06 to the lubrication hole 16 of the reducer groove 12. The lubrication hole 16 is used to transport cooling oil to the oil injection nozzle 60. The oil injection nozzle 60 receives the cooling oil of the lubrication hole 16 and sprays the cooling oil to the reducer 20 to lubricate and cool the bearings, gears and other components of the reducer 20.

[0128] The oil injection nozzle 60 is used to actively spray oil to the reducer 20 to cool and lubricate the reducer 20, so that more uniform cooling and lubrication effects can be achieved, and local overheating or local lubrication can be prevented. The reliability of the cooling oil circuit of the reducer 20 is improved. In addition, the active spraying of the oil injection nozzle 60 has high flexibility and is suitable for different working environments and requirements. In high-temperature working conditions, the temperature of the reducer 20 can be effectively reduced by increasing the amount of sprayed cooling oil. In low-temperature working conditions, the reducer 20 can be kept within a stable working temperature range by reducing the amount of sprayed cooling oil.

[0129] The branch flow channel 06 guides the cooling oil transported by the first housing internal flow channel 01 to the lubrication hole 16, so that the reducer 20 can be cooled and lubricated, and the temperature of the cooling oil entering the reducer groove 12 is ensured not to be too low, so that the cooling oil has good fluidity, the friction loss between the cooling oil and the gear, the input shaft 201, the output shaft 203, the intermediate shaft 202 and other components is reduced, and the power consumption of the power assembly 100 is reduced. The situation that the friction loss between the cooling oil and the gear, the input shaft 201, the output shaft 203, the intermediate shaft 202 and other components is increased due to the too low temperature of the cooling oil is prevented.

[0130] Referring to Figure 4 The inner wall of the valve mounting groove 13 includes a first communication hole 131, a second communication hole 132 and a third communication hole 133. The first communication hole 131 is used to receive the cooling oil output by the oil pump 70. The second communication hole 132 is used to transport the cooling oil to the heat exchanger 30. The third communication hole 133 is used to output the cooling oil. The electromagnetic valve 50 is mounted in the valve mounting groove 13. The electromagnetic valve 50 is used to adjust the flow of the cooling oil received by the first communication hole 131 from the oil pump 70 into at least one of the second communication hole 132 and the third communication hole 133.

[0131] Since the first communication hole 131, the second communication hole 132 and the third communication hole 133 are arranged on the inner wall of the valve mounting groove 13, the first communication hole 131 is used to receive the cooling oil output by the oil pump 70, so at least part of the flow channel between the oil pump 70 and the electromagnetic valve 50 is also located in the housing of the power assembly. Similarly, the second communication hole 132 is used to deliver the cooling oil to the heat exchanger 30, so at least part of the flow channel between the electromagnetic valve 50 and the heat exchanger 30 is also located in the housing of the power assembly. The third communication hole 133 is used to output the cooling oil to the drive motor 10, so at least part of the flow channel between the third communication hole 133 and the drive motor 10 is also located in the housing of the power assembly. By locating at least part of the flow channel between the electromagnetic valve 50 and the oil pump 70, the heat exchanger 30 and the drive motor 10 in the housing of the power assembly, the size and space occupied by the power assembly 100 are further reduced, and the weight of the power assembly 100 is also reduced, thereby facilitating the miniaturization and light weight of the power assembly 100.

[0132] In the scenario where the drive motor 10 is in a high-temperature environment or the heat generation of the drive motor 10 is high, the electromagnetic valve 50 is adjusted to increase the flow of cooling oil from the first communication hole 131 into the second communication hole 132. The heat exchanger 30 is used to exchange heat with the cooling oil entering the heat exchanger 30 to reduce the temperature of the cooling oil, and the cooling oil after heat exchange in the heat exchanger 30 is used to output the cooling oil to the drive motor 10. Since the temperature of the cooling oil is reduced after heat exchange in the heat exchanger 30, the heat exchange amount between the cooling oil and the drive motor 10 is increased, thereby improving the cooling efficiency of the cooling oil on the drive motor 10.

[0133] In the scenario where the drive motor 10 is in a low-temperature environment or the heat generation of the drive motor 10 is low, the electromagnetic valve 50 is adjusted to increase the flow of cooling oil from the first communication hole 131 into the third communication hole 133. The third communication hole 133 is used to output the cooling oil to the drive motor 10. Since the cooling oil is not heat-exchanged in the heat exchanger 30, the heat exchange amount between the cooling oil and the drive motor 10 is reduced, the oil temperature of the cooling oil is increased, and the cooling oil is ensured to be kept in a temperature range with good fluidity, so as to reduce the frictional resistance of the cooling oil and the power consumption of the power assembly 100.

[0134] In some embodiments, referring to Figure 4 , the drive motor 10 includes a stator 101 and a rotor 102, a part of the cooling oil flowing out of the third communication hole 133 is delivered to the stator 101 of the drive motor 10 for cooling and lubricating the stator 101 of the drive motor 10, and another part of the cooling oil flowing out of the third communication hole 133 is delivered to the rotor 102 of the drive motor 10 for cooling and lubricating the rotor 102 of the drive motor 10. By cooling the stator 101 and the rotor 102 of the drive motor 10 respectively, the heat dissipation efficiency of the drive motor 10 is improved.

[0135] In Figure 4 In the embodiment shown, the power assembly 100 further comprises a controller, which is electrically connected with the electromagnetic valve 50 and the oil pump 70 respectively, so as to control the on-off and operation of the electromagnetic valve 50 and the oil pump 70.

[0136] In the above embodiment, the working principle, structure and connection mode of the drive motor 10, the heat exchanger 30, the speed reducer 20, the controller, the electromagnetic valve 50, the oil pump 70, the fine filter 90 and the coarse filter 80 are well known to those skilled in the art, and will not be described here.

[0137] Figure 5 A partial structure schematic diagram of an integrated housing is shown. Referring to Figure 5 , the oil pump 70 and the heat exchanger 30 are fixed to the outside of the integrated housing 1. The valve mounting groove 13 is distributed on the inside of the speed reducer groove 12, and the electromagnetic valve 50 is mounted in the valve mounting groove 13. Since the valve mounting groove 13 is distributed on the inside of the speed reducer groove 12, and the electromagnetic valve 50 is mounted in the valve mounting groove 13, the electromagnetic valve 50 is also accommodated on the inside of the speed reducer groove 12. By utilizing the inside space of the speed reducer groove 12, the valve mounting groove 13 and the electromagnetic valve 50 mounted in the valve mounting groove 13 are arranged more compactly between the other components of the power assembly 100, so that the size and space occupation of the power assembly 100 are further reduced.

[0138] In some embodiments, the opening direction of the valve mounting groove 13 is the same as the opening direction of the speed reducer groove 12, which facilitates the installation of the electromagnetic valve 50. Moreover, since the speed reducer groove 12 has a large size in the axial direction of the drive motor 10, the opening direction of the valve mounting groove 13 is the same as the opening direction of the speed reducer groove 12, which utilizes the size of the speed reducer groove 12 in the axial direction of the drive motor 10, and improves the space utilization rate of the speed reducer groove 12.

[0139] Referring to Figure 5 , the inside of the speed reducer groove 12 includes two lubrication holes 16 for delivering cooling oil to the speed reducer 20. The opening direction of the lubrication hole 16, the opening direction of the valve mounting groove 13 and the opening direction of the speed reducer groove 12 are the same, all extending along the axial direction of the drive motor 10, so that the cooling oil is delivered more directly and quickly to the position requiring lubrication, reducing the loss of cooling oil during delivery, improving the lubrication efficiency and reducing the lubrication cost. In addition, the communication between the lubrication hole 16 and the first housing internal flow passage 01 saves additional pipelines and connecting parts, reduces the complexity of the oil cooling circuit inside the power assembly 100, and helps to realize a more compact structure design of the power assembly 100.

[0140] Referring to Figure 5The inner side of the reducer groove 12 further comprises a first bearing cavity 151, a second bearing cavity 152 and a third bearing cavity 153. The first bearing cavity 151 is used to fix the bearing of the input shaft 201 of the reducer 20, the second bearing cavity 152 is used to fix the bearing of the intermediate shaft 202 of the reducer 20, and the third bearing cavity 153 is used to fix the bearing of the output shaft 203 of the reducer 20. The two lubrication holes 16 are located between the first bearing cavity 151, the second bearing cavity 152 and the third bearing cavity 153. Among the two lubrication holes 16, one lubrication hole 16 is closer to the first bearing cavity 151 and the second bearing cavity 152, and is used to lubricate and cool the first bearing cavity 151, the second bearing cavity 152 and the bearings, shafts, gears and other components installed at the first bearing cavity 151 and the second bearing cavity 152. The other lubrication hole 16 is close to the third bearing cavity 153, and is used to lubricate and cool the third bearing cavity 153 and the bearings, shafts, gears and other components installed at the third bearing cavity 153.

[0141] In other embodiments, the number of lubrication holes 16 is set to one, or the number of lubrication holes 16 is set to three or more, and the number and specific arrangement of the lubrication holes 16 are not limited in the present application. The skilled person can select the number and specific arrangement of the lubrication holes 16 according to actual needs.

[0142] Figure 6 A partial structure diagram of an integrated housing is shown. Referring to Figure 5 and Figure 6 The lubrication hole 16 contains an oil nozzle 60, which is used to receive the cooling oil output by the lubrication hole 16 and to spray the cooling oil to the reducer 20. The oil nozzle 60 is contained in the lubrication hole 16, eliminating the connection structure between the oil nozzle 60 and the lubrication hole 16, and the flow channel between the lubrication hole 16 and the oil pump 70 for supplying oil to the lubrication hole 16 is at least partially located in the integrated housing 1, further reducing the size and space occupied by the power assembly 100, and also reducing the weight of the power assembly 100, thereby facilitating the miniaturization and light weight of the power assembly 100.

[0143] Referring to Figure 5 and Figure 6 The oil nozzle 60 includes two, one of which is used to spray cooling oil to the first bearing cavity 151, the second bearing cavity 152 and the bearings, shafts, gears and other components installed at the first bearing cavity 151 and the second bearing cavity 152, to achieve lubrication and cooling of the components. The other oil nozzle 60 is used to spray cooling oil to the third bearing cavity 153 and the bearings, shafts, gears and other components installed at the third bearing cavity 153, to achieve lubrication and cooling of the components.

[0144] The oil nozzle 60 is used to actively spray oil to the reducer 20 to cool and lubricate the reducer 20, so as to achieve more uniform cooling and lubrication effects, prevent local overheating or local lubrication, and improve the reliability of the cooling oil circuit of the reducer 20. In addition, the oil nozzle 60 actively sprays cooling oil, which has high flexibility and is suitable for different working environments and needs. In high-temperature working conditions, the temperature of the reducer 20 can be effectively reduced by increasing the amount of cooling oil sprayed. In low-temperature working conditions, the reducer 20 can be kept within a stable working temperature range by reducing the amount of cooling oil sprayed.

[0145] Referring to Figure 5 and Figure 6 The outer side of the integrated housing 1 includes an oil outlet hole 141 and an oil inlet hole 142, both of which are distributed on the outer side of the reducer groove 12. The oil outlet hole 141 is used to deliver cooling oil to the heat exchanger 30, and the oil inlet hole 142 is used to receive cooling oil after heat exchange in the heat exchanger 30. The cooling oil flows from the oil outlet hole 141 to the oil inlet of the heat exchanger 30, and the cooling oil exchanges heat with the cooling water in the heat exchanger 30. The cooling oil after heat exchange in the heat exchanger 30 flows out of the oil outlet of the heat exchanger 30 and flows to the oil inlet hole 142 to enter the inside of the integrated housing 1 to lubricate and cool the structure inside the integrated housing 1.

[0146] Since the heat exchanger 30 is fixed to the outer side of the integrated housing 1, and the oil outlet hole 141 and the oil inlet hole 142 are distributed on the outer side of the reducer groove 12, on the one hand, it is convenient for the heat exchanger 30 to be connected to the oil outlet hole 141 and the oil inlet hole 142 respectively, and on the other hand, it simplifies the connection structure between the heat exchanger 30 and the oil outlet hole 141 and the connection structure between the heat exchanger 30 and the oil inlet hole 142, which is beneficial to reduce the number of parts, reduce the assembly process and save space, and the power assembly 100 is more compact and integrated, so the lightweight degree and miniaturization degree of the power assembly 100 are further improved.

[0147] In the above embodiment, the flow channel between the oil pump 70 and the first communication hole 131, the flow channel between the oil pump 70 and the lubrication hole 16, the flow channel between the second communication hole 132 and the oil outlet hole 141, the flow channel between the third communication hole 133 and the stator 101 of the drive motor 10, the flow channel between the third communication hole 133 and the rotor 102 of the drive motor 10, the flow channel between the oil inlet hole 142 and the stator 101 of the drive motor 10, and the flow channel between the oil inlet hole 142 and the rotor 102 of the drive motor 10 are all located inside the housing 40 of the power battery 300. The flow channels inside the housing 40 of the power assembly 100 will be described below with reference to the drawings.

[0148] Figure 7 A partial cross-sectional view of an integrated housing is shown. Referring to Figure 7, the integrated housing 1 includes an oil drain hole 143, an oil pump 70 groove, a fine filter groove 182 and a coarse filter groove 181. The oil drain hole 143 is distributed on the inner side of the reducer groove 12. The oil pump 70 groove is used to install the oil pump 70, the fine filter groove 182 is used to install the fine filter 90 (as shown in Figure 4 ), and the coarse filter groove 181 is used to install the coarse filter 80 (as shown in Figure 4 ). The oil drain hole 143 is used to drain cooling oil received by at least one of the reducer groove 12 and the motor groove 11, and is used to deliver cooling oil to the coarse filter groove 181. The coarse filter groove 181 is used to receive cooling oil delivered by the oil drain hole 143 and is used to deliver cooling oil to the oil pump 70 groove. The oil pump 70 groove is used to receive cooling oil from the coarse filter groove 181 and is used to deliver cooling oil to the oil pump 70. The fine filter groove 182 is used to receive cooling oil output by the oil pump 70 and is used to deliver cooling oil to the first housing internal flow passage 01. The functions of the fine filter 90 and the coarse filter 80 have been described above and will not be repeated here.

[0149] The oil drain hole 143 is distributed on the inner side of the reducer groove 12, which facilitates the discharge of cooling oil in the reducer groove 12. The opening direction of the oil drain hole 143 is opposite to the opening direction of the reducer groove 12 along the axial direction of the drive motor 10. By setting the installation position of the power assembly 100, the cooling oil in the reducer groove 12 is collected at the oil drain hole 143 and discharged from the reducer groove 12.

[0150] Referring to Figure 7 , the opening direction of the oil drain hole 143, the opening direction of the coarse filter groove 181 and the opening direction of the oil pump 70 groove are the same, so the opening direction of the coarse filter groove 181 and the opening direction of the oil pump 70 groove are opposite to the opening direction of the reducer groove 12. Since the opening direction of the motor groove 11 is opposite to the opening direction of the reducer groove 12, the opening direction of the oil drain hole 143, the opening direction of the coarse filter groove 181, the opening direction of the oil pump 70 groove and the opening direction of the motor groove 11 are the same. By utilizing the space between the reducer groove 12 and the motor groove 11, the structure of the power assembly 100 is more compact and integrated, so the lightweight degree and the miniaturization degree of the power assembly 100 are further improved.

[0151] In some embodiments, the coarse filter groove 181 and the oil pump 70 groove are coaxially arranged and communicated, which saves the connecting structure between the coarse filter groove 181 and the oil pump 70 groove, reduces the number of parts, size and occupied space, and reduces the assembly process of the power assembly 100, which is beneficial to the lightweight and miniaturization of the power assembly 100.

[0152] In some embodiments, the coarse filter tank 181 and the oil drain hole 143 are communicated, the connecting structure between the oil drain hole 143 and the coarse filter tank 181 is saved, the number of parts, the size and the occupied space are reduced, the assembly process of the power assembly 100 is reduced, and the power assembly 100 is lightened and miniaturized.

[0153] With reference to Figure 7 , the slot opening direction of the fine filter tank 182 is perpendicular to the slot opening direction of the oil pump 70 tank, the size in the direction perpendicular to the slot opening direction of the oil pump 70 tank is more effectively utilized, the power assembly 100 is more compact, and the occupied space is smaller. In addition, since the fine filter 90 needs to be replaced and maintained regularly, and the oil pump 70 needs to be electrically connected to the controller and the like to ensure the reliability and stability of the oil cooling circuit inside the power assembly 100, the slot opening direction of the fine filter tank 182 is perpendicular to the slot opening direction of the oil pump 70 tank, which helps to disassemble the oil pump 70 and the fine filter 90 respectively, and makes it easier to troubleshoot and repair.

[0154] In Figure 7 the embodiments shown, the inside of the integrated housing 1 further comprises a first housing internal flow channel 01, which is used to receive the cooling oil output by the oil pump 70 and to output the cooling oil through the first communication hole 131 (as shown in Figure 4 ). The first housing internal flow channel 01 is provided, on the one hand, to utilize the internal space of the integrated housing 1, save the external connecting pipeline between the oil pump 70 and the first communication hole 131, reduce the number of parts of the power assembly 100, and make the structure of the power assembly 100 more compact and the occupied space smaller, and on the other hand, to reduce the weight of the integrated housing 1, and facilitate the miniaturization and lightening of the power assembly 100.

[0155] In some embodiments, the inner diameter of the first housing internal flow channel 01 is smaller than the inner diameter of the valve mounting groove 13 (as shown in Figure 4 ). The inner diameter of the first housing internal flow channel 01 is small, so the flow rate of the cooling oil in the first housing internal flow channel 01 is high, the flow rate is increased, the heat exchange amount between the cooling oil and the inner wall of the first housing internal flow channel 01 is increased, and the heat exchange efficiency of the cooling oil is increased, so as to reduce the temperature of the cooling oil, and facilitate the reduction of the energy consumption of the power assembly 100. In addition, the increase of the flow rate reduces the accumulation amount of the deposits in the cooling oil in the first housing internal flow channel 01, and prevents the formation and accumulation of the deposits in the cooling oil.

[0156] In some embodiments, the first housing internal flow channel 01 is distributed on the inner side of the motor tank 11, the cooling oil in the first housing internal flow channel 01 exchanges heat with the motor tank 11, the heat exchange amount between the driving motor 10 and the cooling oil is increased, and therefore the heat dissipation efficiency of the driving motor 10 located in the motor tank 11 is further improved, thereby facilitating the reduction of the energy consumption of the power assembly 100.

[0157] Figure 8 Figure 2 shows a partial cross-sectional view of the integrated housing. Referring to Figure 4 、 Figure 8 The lubrication hole 16 is used to receive the cooling oil delivered by the first housing internal flow passage 01 and to deliver the cooling oil to the reducer 20. The lubrication hole 16 is in communication with the first housing internal flow passage 01, which saves additional piping and connections, reduces the complexity of the oil cooling circuit inside the power assembly 100, and helps to achieve a more compact structural design of the power assembly 100.

[0158] Referring to Figure 8 The lubrication hole 16 contains an oil nozzle 60, which includes a second oil inlet 601 and an oil injection port 602. The second oil inlet 601 is used to receive the cooling oil output by the lubrication hole 16 and to deliver the cooling oil to the oil injection port 602, and the oil injection port 602 is used to spray the cooling oil to the reducer 20. The working principle, advantages, and arrangement of the oil nozzle 60 for cooling and lubricating the reducer 20 have been described above and will not be repeated here.

[0159] In some embodiments, referring to Figure 5 、 Figure 6 and Figure 8 The included angle between the opening direction of the oil injection port 602 and the opening direction of the lubrication hole 16 is arranged towards the reducer 20 to ensure that the oil injection port 602 is arranged towards the reducer 20 to ensure that the oil injection port 602 is arranged towards the reducer 20 to ensure that the cooling oil is sprayed onto the reducer 20 to achieve cooling and lubrication of the reducer 20.

[0160] The inner diameter of the lubrication hole 16 is smaller than the inner diameter of the first housing internal flow passage 01, and the inner diameter of the oil injection port 602 is smaller than the inner diameter of the lubrication hole 16, to increase the flow rate of the cooling oil in the lubrication hole 16, so that the cooling oil sprayed from the oil injection port 602 has a higher flow rate, a larger spraying area, and a longer spraying distance, so that the cooling oil is more uniformly sprayed onto the reducer 20, further preventing local overheating or local lubrication, and effectively improving the reliability of the cooling oil circuit of the reducer 20.

[0161] Referring to Figure 8 The interior of the integrated housing 1 includes branch flow passages 06, each of which is used to receive the cooling oil delivered by the first housing internal flow passage 01 and to deliver the cooling oil to the lubrication hole 16.

[0162] In some embodiments, the length of the branch flow channel 06 is less than the length of the first housing internal flow channel 01, so that the pressure loss of the cooling oil flowing in the branch flow channel 06 is small, the energy consumption of the power assembly 100 is reduced, and the shorter branch flow channel 06 is more convenient for processing and manufacturing. The inner diameter of the branch flow channel 06 is smaller than the inner diameter of the first housing internal flow channel 01, so that the flow rate of the cooling oil in the branch flow channel 06 is greater than the flow rate of the cooling oil in the first housing internal flow channel 01, which is beneficial to increase the flow rate, spray distance and spray area of the cooling oil sprayed by the oil injection port 602, and is beneficial to improve the heat dissipation efficiency of the reducer 20.

[0163] In the embodiments given in the present application, the structures of the two oil injection nozzles 60 are not the same, one of the oil injection nozzles 60 includes three oil injection ports 602, and the other oil injection nozzle 60 includes two oil injection ports 602. In other embodiments, the structures of the two oil injection nozzles 60 are the same, which is not specially limited in the present application, and can be selectively designed by those skilled in the art according to actual needs.

[0164] Figure 9 A partial cross-sectional view of an integrated housing is shown. Referring to Figure 9 , the integrated housing 1 internally includes a second housing internal flow channel 02, and the heat exchanger 30 is provided with a first oil inlet 303 facing the surface of the integrated housing 1. The second housing internal flow channel 02 is used to receive cooling oil from the second communication hole 132 and to output the cooling oil through the oil outlet hole 141, and the first oil inlet 303 of the heat exchanger 30 is used to receive the cooling oil of the oil outlet hole 141.

[0165] The cooling oil enters the second housing internal flow channel 02 from the second communication hole 132 and is delivered to the first oil inlet 303 through the oil outlet hole 141, and the heat exchanger 30 is used to exchange heat with the cooling oil entering the heat exchanger 30 to reduce the temperature of the cooling oil. The second housing internal flow channel 02 is provided, on the one hand, to utilize the internal space of the integrated housing 1, save the external connecting pipeline between the heat exchanger 30 and the second communication hole 132, reduce the number of parts of the power assembly 100, and facilitate the power assembly 100 to be more compact in structure and occupy less space, and on the other hand, to reduce the weight of the integrated housing 1, and facilitate the miniaturization and light weight of the power assembly 100.

[0166] In some embodiments, the heat exchanger 30 includes a cooling water inlet 301 and a cooling water outlet 302, and cooling water enters the heat exchanger 30 from the cooling water inlet 301 and exchanges heat with the cooling oil in the heat exchanger 30. The heat-exchanged cooling water is discharged from the heat exchanger 30 through the cooling water outlet 302. In other embodiments, the heat exchange medium of the heat exchanger 30 is air or refrigerant, which can be selectively designed by those skilled in the art according to actual needs.

[0167] In some embodiments, the second shell internal flow channel 02 is perpendicular to the groove of the valve mounting groove 13 and the surface of the integrated shell 1 towards the heat exchanger 30 respectively, so that the distance between the second shell internal flow channel 02 and the heat exchanger 30 is the shortest, and the distance between the second shell internal flow channel 02 and the valve mounting groove 13 is the shortest, the cooling oil is transported by the shortest flow path, the pressure loss of the cooling oil is reduced, the energy consumption is reduced, and the machining and manufacturing of the second shell internal flow channel 02 on the integrated shell 1 are facilitated.

[0168] The inner diameter of the second shell internal flow channel 02 is smaller than the inner diameter of the valve mounting groove 13, which increases the flow rate of the cooling oil entering the second shell internal flow channel 02, so that the cooling oil quickly enters the second shell internal flow channel 02 and enters the heat exchanger 30 for cooling, which is beneficial to shorten the heat exchange time and improve the heat exchange efficiency. The inner diameter of the second shell internal flow channel 02 is smaller than the inner diameter of the first oil inlet 303, so that the flow rate of the cooling oil entering the heat exchanger 30 is reduced, thereby ensuring that the cooling oil is more effectively cooled in the heat exchanger 30, and ensuring that the cooling oil output by the heat exchanger 30 is in a low-temperature state.

[0169] In some embodiments, by adjusting the electromagnetic valve 50, the flow of the cooling oil entering the heat exchanger 30 is controlled to change the temperature of the cooling oil output from the heat exchanger 30 (the temperature of the cooling oil entering the power assembly 100) to adapt to different working conditions.

[0170] Referring to Figure 9 , the interior of the integrated shell 1 further comprises a third shell internal flow channel 03, and the third shell internal flow channel 03 is used for receiving the cooling oil output by at least one of the heat exchanger 30 and the third communication hole 133.

[0171] In the scenario that the power assembly 100 is in a high-temperature environment or the heat generation of the driving motor 10 is high, the third shell internal flow channel 03 is used for receiving the cooling oil output by the heat exchanger 30, so that the cooling oil entering the third shell internal flow channel 03 is all the cooling oil cooled by the heat exchanger 30, the lower the temperature of the cooling oil, the greater the heat exchange amount between the cooling oil and the driving motor 10, and the higher the heat dissipation efficiency of the driving motor 10.

[0172] In the scenario that the power assembly 100 is in a low-temperature environment or the heat generation of the driving motor 10 is low, the third shell internal flow channel 03 is used for receiving the cooling oil output by the third communication hole 133, so that the cooling oil entering the third shell internal flow channel 03 is not cooled by the heat exchanger 30, the temperature of the cooling oil is high, the heat exchange amount between the cooling oil and the driving motor 10 is small, the cooling efficiency of the driving motor 10 is reduced, and the working temperature of the driving motor 10 is ensured.

[0173] In other embodiments, the internal flow channel 03 of the third housing is used to receive cooling oil output from the heat exchanger 30 and cooling oil output from the third connecting hole 133 for use in other different scenarios.

[0174] In some embodiments, the internal flow channel 03 of the third housing is perpendicular to the opening orientation of the valve mounting groove 13, so that the distance between the internal flow channel 03 of the third housing and the valve mounting groove 13 is minimized, the cooling oil is transported using the shortest flow path, the pressure loss of the cooling oil is reduced, energy consumption is reduced, and the internal flow channel 03 of the third housing is facilitated to be processed and manufactured on the integrated housing 1.

[0175] The inner diameter of the internal flow channel 03 of the third housing is smaller than the inner diameter of the valve mounting groove 13, which increases the flow rate of the cooling oil entering the internal flow channel 03 of the third housing, so that the cooling oil can quickly enter the internal flow channel 03 of the third housing and flow out along the internal flow channel 03 of the third housing, ensuring the flow rate of the cooling oil and the heat exchange efficiency of the cooling oil to the drive motor 10.

[0176] Reference Figure 9 The outer side of the integrated housing 1 also includes an oil inlet 142, which is used to receive cooling oil after heat exchange by the heat exchanger 30. The internal flow channel 03 of the third housing is used to receive cooling oil after heat exchange by the heat exchanger 30 through the oil inlet 142 via the internal flow channel 04 of the fourth housing.

[0177] Cooling oil enters the oil inlet 142 from the oil outlet of the heat exchanger 30, and then enters the internal flow channel 03 of the third housing through the internal flow channel 04 of the fourth housing. The design of the internal flow channel 04 of the fourth housing utilizes the internal space of the integrated housing 1, saving the external connecting pipe between the heat exchanger 30 and the oil inlet 142, reducing the number of parts in the powertrain 100, which helps to make the structure of the powertrain 100 more compact and occupy less space. On the other hand, it reduces the weight of the integrated housing 1, which is conducive to the miniaturization and weight reduction of the powertrain 100.

[0178] In this embodiment, the internal flow channel 04 of the fourth housing is perpendicular to the internal flow channel 03 of the third housing and the surface of the heat exchanger 30 facing the integrated housing 1, so that the distance between the internal flow channel 03 of the third housing and the heat exchanger 30 is minimized, and the distance between the internal flow channel 04 of the fourth housing and the internal flow channel 03 of the third housing is minimized. The cooling oil is transported using the shortest flow path, which reduces the pressure loss of the cooling oil, reduces energy consumption, and facilitates the processing and manufacturing of the internal flow channel 04 of the fourth housing on the integrated housing 1.

[0179] The inner diameter of the internal flow channel 04 of the fourth housing is larger than the inner diameter of the oil outlet of the heat exchanger 30, which reduces the flow rate of the cooling oil entering the internal flow channel 04 of the fourth housing, reduces the impact force of the cooling oil on the integrated housing 1, and increases the heat exchange time of the cooling oil, thereby improving the heat exchange efficiency.

[0180] The length of the fourth inner flow passage 04 is less than the length of the third inner flow passage 03, so the pressure loss of the cooling oil flowing in the fourth inner flow passage 04 is smaller, the energy consumption of the power assembly is reduced, and the shorter fourth inner flow passage 04 is more convenient for processing and manufacturing.

[0181] Referring to Figure 4 and Figure 9 , the integrated housing 1 further comprises a fifth inner flow passage 07 and a sixth inner flow passage 08, the fifth inner flow passage 07 and the sixth inner flow passage 08 are respectively in communication with the third inner flow passage 03, the fifth inner flow passage 07 is used for receiving the cooling oil delivered by the third inner flow passage 03 and is used for delivering the cooling oil to the stator 101 of the drive motor 10 to cool the stator 101 of the drive motor 10, and the sixth inner flow passage 08 is used for receiving the cooling oil delivered by the third inner flow passage 03 and is used for delivering the cooling oil to the rotor 102 of the drive motor 10 to cool the rotor 102 of the drive motor 10.

[0182] Figure 10 A partial cross-sectional view of an integrated housing is shown. Referring to Figure 4 and Figure 10 , the inner side of the motor slot 11 comprises a first cooling hole 171, the first cooling hole 171 is used for receiving the cooling oil delivered by the third inner flow passage 03 and is used for delivering the cooling oil to the stator 101 of the drive motor 10.

[0183] The cooling oil delivered by the third inner flow passage 03 is delivered to the first cooling hole 171, and the first cooling hole 171 delivers the cooling oil to the stator 101 of the drive motor 10 to cool the stator 101 of the drive motor 10.

[0184] In this embodiment, the opening of the first cooling hole 171 is oriented perpendicular to the axial direction of the drive motor 10, so that the cooling oil enters the stator 101 of the drive motor 10 in a direction perpendicular to the axial direction of the drive motor 10, ensuring the cooling efficiency of the stator 101. The inner diameter of the first cooling hole 171 is smaller than the inner diameter of the third inner flow passage 03, on the one hand, it is convenient for the cooling oil of the first cooling hole 171 to smoothly enter the stator 101 of the drive motor 10, and on the other hand, it improves the flow rate of the cooling oil entering the drive motor 10, so as to improve the cooling efficiency of the cooling oil on the stator 101 of the drive motor 10.

[0185] In some embodiments, referring to Figure 9 and Figure 10The integrated housing 1 further comprises a fifth housing internal flow channel 07 which is perpendicular to the third housing internal flow channel 03. The fifth housing internal flow channel 07 extends in part along the axial direction of the drive motor 10 and in part perpendicular to the axial direction of the drive motor 10, and is used to receive the cooling oil delivered by the third housing internal flow channel 03 and to deliver the cooling oil to the first cooling hole 171.

[0186] The provision of the fifth housing internal flow channel 07, on the one hand, makes use of the internal space of the integrated housing 1, saves the external connecting pipeline between the first cooling hole 171 and the third housing internal flow channel 03, reduces the number of parts of the power assembly 100, and is conducive to making the structure of the power assembly 100 more compact and occupying less space. On the other hand, it reduces the weight of the integrated housing 1, which is conducive to the miniaturization and light weight of the power assembly 100.

[0187] Figure 11 A partial cross-sectional view of a reducer end cover is shown. Referring to Figure 4 and Figure 11 The reducer end cover 2 comprises one or more second cooling holes 172, each of which is used to receive the cooling oil delivered by the third housing internal flow channel 03 and to deliver the cooling oil to the rotor 102 of the drive motor 10.

[0188] The cooling oil delivered by the third housing internal flow channel 03 is delivered to the second cooling hole 172, and the second cooling hole 172 delivers the cooling oil to the rotor 102 of the drive motor 10 to cool the rotor 102 of the drive motor 10.

[0189] In this embodiment, the opening of the second cooling hole 172 is oriented perpendicular to the axial direction of the drive motor 10, so that the cooling oil enters the rotor 102 of the drive motor 10 in a direction perpendicular to the axial direction of the drive motor 10, ensuring the cooling efficiency of the rotor 102. The inner diameter of the second cooling hole 172 is smaller than the inner diameter of the third housing internal flow channel 03, which on the one hand facilitates the smooth entry of the cooling oil of the second cooling hole 172 into the rotor 102 of the drive motor 10, and on the other hand improves the flow rate of the cooling oil entering the drive motor 10, to improve the cooling efficiency of the cooling oil on the rotor 102 of the drive motor 10.

[0190] Referring to Figure 11 The reducer end cover 2 comprises an end cover internal flow channel 09 inside the end cover 2, which is used to receive the cooling oil delivered by the third housing internal flow channel 03 and to deliver the cooling oil to the second cooling hole 172.

[0191] The end cover internal flow passage 09 is arranged in the internal space of the integrated housing 1, saves the external connecting pipeline between the second cooling hole 172 and the third housing internal flow passage 03, reduces the number of parts of the power assembly 100, is conducive to making the structure of the power assembly 100 more compact and occupying less space, and on the other hand, reduces the weight of the integrated housing 1, which is conducive to the miniaturization and light weight of the power assembly 100.

[0192] In some embodiments, the integrated housing 1 further comprises a sixth housing internal flow passage 08, which is used to receive the cooling oil delivered by the third housing internal flow passage 03 and to deliver the cooling oil to the end cover internal flow passage 09.

[0193] The sixth housing internal flow passage 08 is arranged in the internal space of the integrated housing 1, saves the external connecting pipeline between the end cover internal flow passage 09 and the third housing 40 internal flow passage, reduces the number of parts of the power assembly 100, is conducive to making the structure of the power assembly 100 more compact and occupying less space, and on the other hand, reduces the weight of the integrated housing 1, which is conducive to the miniaturization and light weight of the power assembly 100.

[0194] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A powertrain, characterized by, An inner side of the housing of the power assembly is configured to accommodate a drive motor and a speed reducer of the power assembly, an outer side of the housing is configured to fix a heat exchanger and an oil pump of the power assembly, the heat exchanger is configured to exchange heat with cooling oil, and the oil pump is configured to drive flow of the cooling oil, wherein: The outer side of the housing comprises an oil outlet hole configured to deliver the cooling oil to the heat exchanger. The inner side of the housing comprises a valve mounting groove configured to mount an electromagnetic valve, an inner wall of the valve mounting groove comprises a first communication hole, a second communication hole and a third communication hole, the first communication hole is configured to receive the cooling oil output by the oil pump, the second communication hole is configured to communicate with the oil outlet hole, and the third communication hole is configured to output the cooling oil, and the electromagnetic valve is configured to adjust flow of the cooling oil received by the first communication hole from the oil pump into at least one of the second communication hole and the third communication hole.

2. The powertrain of claim 1, wherein, The housing of the power assembly comprises an integrated housing, a speed reducer end cover and a motor end cover, the integrated housing comprises a motor groove and a speed reducer groove, the speed reducer end cover is configured to enclose the speed reducer groove to form a speed reducer cavity, the motor end cover is configured to enclose the motor groove to form a motor cavity, the motor cavity is configured to accommodate the drive motor, and the speed reducer cavity is configured to accommodate the speed reducer, wherein: The valve mounting groove is distributed on an inner side of the speed reducer groove, and the oil outlet hole is distributed on an outer side of the speed reducer groove.

3. The powertrain of claim 2, wherein, An inner part of the integrated housing comprises a first housing inner flow channel, the first housing inner flow channel is configured to receive the cooling oil output by the oil pump and to output the cooling oil through the first communication hole, wherein: The first housing inner flow channel is distributed on an outer side of the motor groove, and an inner diameter of the first housing inner flow channel is smaller than an inner diameter of the valve mounting groove.

4. The powertrain of claim 3, wherein, An inner side of the speed reducer groove comprises one or more lubrication holes, each of the lubrication holes is configured to receive the cooling oil delivered by the first housing inner flow channel and to deliver the cooling oil to the speed reducer, wherein: An opening direction of the lubrication hole is the same as a slot direction of the valve mounting groove and a slot direction of the speed reducer groove.

5. The powertrain of claim 4, wherein, Each of the lubrication holes is configured to accommodate an oil jet nozzle, the oil jet nozzle comprises an oil inlet and an oil outlet, the oil inlet of the oil jet nozzle is configured to receive the cooling oil delivered by the lubrication hole and to deliver the cooling oil to the oil outlet, and the oil outlet is configured to jet the cooling oil to the speed reducer, wherein: An included angle between an opening direction of the oil outlet and an opening direction of the lubrication hole is arranged towards the speed reducer, an inner diameter of the oil outlet is smaller than an inner diameter of the lubrication hole, and the inner diameter of the lubrication hole is smaller than an inner diameter of the first housing inner flow channel.

6. The powertrain of claim 4 or 5, characterized in that, The inner part of the integrated housing comprises one or more branch flow channels, each of the branch flow channels is configured to receive the cooling oil delivered by the first housing inner flow channel and to deliver the cooling oil to the lubrication hole, wherein: A length of the branch flow channel is smaller than a length of the first housing inner flow channel, and an inner diameter of the branch flow channel is smaller than an inner diameter of the first housing inner flow channel.

7. The powertrain of claim 2, wherein, The inside of the integrated housing comprises a second housing internal flow channel, the heat exchanger is provided with an oil inlet port towards the surface of the integrated housing, the second housing internal flow channel is used for receiving cooling oil from the second communication hole and for outputting cooling oil through the oil outlet hole, the oil inlet port of the heat exchanger is used for receiving cooling oil of the oil outlet hole, wherein: The second housing internal flow channel is respectively perpendicular to the slot opening of the valve mounting slot and the surface of the heat exchanger towards the integrated housing, the inner diameter of the second housing internal flow channel is respectively smaller than the inner diameter of the valve mounting slot and the inner diameter of the oil inlet port of the heat exchanger.

8. The powertrain of claim 2, wherein, The inside of the integrated housing comprises a third housing internal flow channel, the third housing internal flow channel is used for receiving cooling oil outputted by at least one of the heat exchanger and the third communication hole and for delivering cooling oil to the driving motor, wherein: The third housing internal flow channel is perpendicular to the slot opening of the valve mounting slot, the inner diameter of the third housing internal flow channel is smaller than the inner diameter of the valve mounting slot.

9. The powertrain of claim 8, wherein, The outside of the integrated housing further comprises an oil inlet hole, the oil inlet hole is used for receiving cooling oil after heat exchange of the heat exchanger, the third housing internal flow channel is used for receiving cooling oil after heat exchange of the heat exchanger from the oil inlet hole through a fourth housing internal flow channel, wherein: The fourth housing internal flow channel is respectively perpendicular to the third housing internal flow channel and the surface of the heat exchanger towards the integrated housing, the length of the fourth housing internal flow channel is smaller than the length of the third housing internal flow channel, the inner diameter of the fourth housing internal flow channel is larger than the inner diameter of the oil outlet port of the heat exchanger.

10. The powertrain of claim 8 or 9, characterized in that, The inside of the motor slot comprises one or more first cooling holes, each of the first cooling holes is used for receiving cooling oil delivered by the third housing internal flow channel and for delivering cooling oil to the stator of the driving motor, wherein: The opening of the first cooling hole is perpendicular to the axial direction of the driving motor, the inner diameter of the first cooling hole is smaller than the inner diameter of the third housing internal flow channel.

11. The powertrain of claim 8 or 9, wherein, The reducer end cover comprises one or more second cooling holes, each of the second cooling holes is used for receiving cooling oil delivered by the third housing internal flow channel and for delivering cooling oil to the rotor of the driving motor, wherein: The opening of the second cooling hole is perpendicular to the axial direction of the driving motor, the inner diameter of the second cooling hole is smaller than the inner diameter of the third housing internal flow channel.

12. The powertrain of claim 11, wherein, The inside of the reducer end cover comprises an end cover internal flow channel, the end cover internal flow channel is used for receiving cooling oil delivered by the third housing internal flow channel and for delivering cooling oil to the second cooling hole.

13. The powertrain of claim 2, wherein, The integrated housing further comprises an oil pump slot and a fine filter slot, the oil pump slot is used for mounting the oil pump, the fine filter slot is used for mounting a fine filter, for receiving cooling oil outputted by the oil pump and for delivering cooling oil to the fine filter, the fine filter is used for filtering cooling oil, wherein: The slot opening direction of the motor slot is opposite to the slot opening direction of the reducer slot along the axial direction of the drive motor, the slot opening direction of the valve mounting slot is the same as the slot opening direction of the reducer slot, the slot opening direction of the oil pump slot is the same as the slot opening direction of the motor slot, and the slot opening direction of the fine filter slot is perpendicular to the slot opening direction of the oil pump slot.

14. The powertrain of claim 13, wherein, The integrated housing further comprises an oil drain hole and a coarse filter slot, the oil drain hole is used to receive the cooling oil of at least one of the reducer slot and the motor slot and to deliver the cooling oil to the coarse filter slot, the coarse filter slot is used to mount a coarse filter, to receive the cooling oil delivered by the oil drain hole and to deliver the cooling oil to the coarse filter, the coarse filter is used to filter the cooling oil and to deliver the cooling oil to the oil pump slot, and wherein: The oil drain hole is distributed on the inner side of the reducer slot, the opening direction of the oil drain hole is opposite to the slot opening direction of the reducer slot along the axial direction of the drive motor, and the opening direction of the oil drain hole, the slot opening direction of the coarse filter slot and the slot opening direction of the oil pump slot are the same.

15. An electric vehicle characterized by comprising: The electric vehicle comprises wheels and a power assembly according to any one of claims 1-14, the power assembly being used to drive the wheels.

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