Power assembly and electric vehicle

Abstract

A power assembly and an electric vehicle relate to the technical field of electric vehicles, a shell of the power assembly comprises a groove along the outer wall surface of one axial end of the power assembly, the groove is used for accommodating a gear and a differential mechanism of a speed reducer and is used for enclosing the gear and the differential mechanism with an end cover, and the gear is used for connecting the differential mechanism; the bottom wall of one groove comprises the other groove, the end cover, the one groove and the other groove are used for being sequentially arranged in the axial direction of the power assembly, the inner diameter of the other groove is smaller than that of the one groove, and the differential mechanism is used for penetrating through the bottom wall of the one groove to stretch into the other groove. According to the power assembly, the gear and the differential mechanism rotate to carry lubricating oil to a high position, so that more lubricating oil can flow into the bearing from one groove to cool and lubricate the bearing, the oil amount of the lubricating oil used for cooling and lubricating the speed reducer bearing is increased, and the cooling and lubricating effects of the bearing are improved.

Description

TECHNICAL FIELD

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

[0002] The bearings of the speed reducer are usually cooled and lubricated by lubricating oil to reduce temperature and wear, so as to improve the working efficiency of the power assembly and ensure the safe operation of the power assembly. The rotation of the speed reducer can drive the lubricating oil into the oil groove of the bearing seat, thereby cooling and lubricating the bearings. However, this method can cause insufficient lubricating oil supply to the bearings, affecting the cooling and lubrication effect and reducing the efficiency of the power assembly. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a power assembly and an electric vehicle, which can improve the oil amount of the lubricating oil used for cooling and lubricating the bearings of the speed reducer, and improve the cooling and lubrication effect of the bearings.

[0004] In a first aspect, the present application provides a power assembly, the housing of the power assembly comprises a groove on the outer wall surface of one end of the power assembly in the axial direction of the power assembly, the groove is used for accommodating a gear and a differential of a speed reducer and is used for enclosing the gear and the differential with an end cover, the gear is used for connecting the differential, wherein: the bottom wall of the groove comprises another groove, the end cover, the groove and the other groove are arranged in sequence in the axial direction of the power assembly, the inner diameter of the other groove is smaller than the inner diameter of the groove, and the differential is used for extending into the other groove through the bottom wall of the groove.

[0005] In the power assembly provided by the present application, the groove is matched with the outer shape of the gear, and the other groove is matched with the outer shape of the differential, so that the spacing between the side wall of the groove and the side wall of the gear is reduced, and the spacing between the side wall of the other groove and the side wall of the differential is reduced. The design of the groove and the other groove is more suitable for the outer shape of the gear and the differential. The side wall of the groove and the side wall of the gear form a flow path for the lubricating oil, and the side wall of the other groove and the side wall of the differential form a flow path for the lubricating oil. The cooperation between the side wall of the groove and the side wall of the gear helps to concentrate and guide the lubricating oil thrown out from the gear, and the cooperation between the side wall of the other groove and the side wall of the differential helps to concentrate and guide the lubricating oil thrown out from the differential. The rotation of the gear and the differential carries the lubricating oil to a higher position, so that more lubricating oil can flow from the groove to the other groove along the flow path. The lubricating oil in the other groove continues to be thrown out of the other groove with the rotation of the differential, and finally enters the bearings to cool and lubricate the bearings. The oil amount of the lubricating oil used for cooling and lubricating the bearings of the speed reducer is improved, and the cooling and lubrication effect of the bearings is improved.

[0006] In one embodiment, the side wall of the other groove is inclined towards the axis of the other groove in the direction from the groove opening to the groove bottom. During the operation of the differential, the inclined side wall of the other groove can make the lubricating oil flow along the inclined side wall under the action of centrifugal force and the guiding of the inclined side wall, effectively deliver the lubricating oil out of the other groove, and avoid the problem of insufficient lubricating oil for cooling and lubricating the bearing due to the accumulation of lubricating oil between the side wall of the other groove and the side wall of the differential.

[0007] In one embodiment, the inner wall surface of the other groove is an arc surface, which is a smooth surface without protrusions or depressions, does not hinder the flow of lubricating oil, can reduce the resistance of lubricating oil during flow, and improve the flowability of lubricating oil. The smooth arc surface can avoid the lubricating oil remaining in the other groove, and ensure that more lubricating oil flows out of the other groove to the bearing for cooling and lubricating the bearing.

[0008] In one embodiment, the length of the other groove in the axial direction of the power assembly is greater than the length of the one groove, the differential has more internal gear assemblies, and requires more space for installation. The length of the other groove in the axial direction of the power assembly being greater than the length of the one groove enables the other groove to accommodate more differentials, and is conducive to better matching of the other groove and the differential.

[0009] In one embodiment, the distance between the side wall of the other groove and the side wall of the differential in the radial direction of the power assembly is within the range of 2-4 mm. The size of the other groove can be adaptively designed according to the size of the differential itself, to ensure that the size and shape of the other groove and the differential located in the other groove are more matched. At the same time, it is helpful to better constrain the lubricating oil between the side wall of the differential and the side wall of the other groove, so that the lubricating oil is more concentrated under the driving of the differential, and flows into the bearing along the flow path formed between the side wall of the differential and the side wall of the other groove, to cool and lubricate the bearing.

[0010] In one embodiment, the distance between the side wall of the one groove and the side wall of the gear in the radial direction of the gear is within the range of 2-4 mm, and the distance between the gear and the bottom wall of the one groove in the axial direction of the power assembly is within the range of 2-4 mm.

[0011] In the embodiment of the present application, the spacing between the side wall of the one groove and the side wall of the gear in the radial direction of the gear is in the range of 2-4 mm, and the radial dimension of the one groove can be adaptively designed according to the dimension of the gear itself, so as to ensure that the one groove and the gear located in the one groove are more matched in size and shape. At the same time, it is helpful to better constrain the lubricating oil between the side wall of the gear and the side wall of the one groove, so that the lubricating oil is more concentratedly splashed under the driving of the gear and flows into the bearing along the flow path formed between the side wall of the gear and the side wall of the one groove, thereby cooling and lubricating the bearing.

[0012] The spacing between the gear in the axial direction of the power assembly and the bottom wall of the one groove is in the range of 2-4 mm, and the axial dimension of the one groove can be adaptively designed according to the dimension of the gear itself, so as to ensure the normal work of the gear, and it is helpful to better constrain the lubricating oil between the side wall of the gear and the side wall of the one groove, so that the lubricating oil is more concentratedly splashed under the driving of the gear. At the same time, it is helpful to reduce the axial dimension of the power assembly.

[0013] In one embodiment, the bottom wall of the another groove comprises a third groove, the one groove, the another groove and the third groove are arranged in sequence in the axial direction of the power assembly, one end of the axle of the differential gear penetrates into the third groove through the bottom wall of the another groove, and the inner wall of the third groove is used for fixing the outer ring of the bearing of the reducer, and the inner ring of the bearing is used for fixing one end of the axle of the differential gear.

[0014] In the embodiment of the present application, the another groove and the third groove are arranged in sequence in the axial direction of the power assembly, and the one groove, the another groove and the third groove are coaxially arranged. The another groove and the third groove are connected through another through hole in the axial direction of the power assembly, so as to facilitate the penetration of one end of the axle of the differential gear into the third groove through the another through hole in the another groove, and facilitate the flow of the lubricating oil from the one groove into the another groove through the through hole, thereby saving the flow path of the lubricating oil.

[0015] In one embodiment, the side wall of the another groove comprises an oil groove, the length of the one oil groove in the axial direction of the power assembly is greater than or equal to the length of the another groove, and one end of the one oil groove in the axial direction of the power assembly penetrates through the bottom wall of the one groove. The one oil groove is used to connect the one groove and the third groove.

[0016] In the embodiments of the present application, one oil groove is used to contain and store lubricating oil. One oil groove is used to connect one groove and a third groove. When the gear rotates, due to the centrifugal force, the lubricating oil is thrown out of one groove and splashes into another groove. The splashed lubricating oil is collected and stored by one oil groove. The lubricating oil in one oil groove further flows into the third groove to cool and lubricate the bearing, thereby improving the cooling and lubricating effect of the bearing and improving the performance of the power assembly.

[0017] In one embodiment, the bottom wall of the other groove includes another oil groove. The sum of the length of the bottom wall of the one oil groove along the radial direction of the other groove and the length of the bottom wall of the other groove is greater than the length of the bottom wall of the other groove. One end of the other groove along the radial direction of the other groove penetrates the side wall of the third groove. The other groove is used to connect the one oil groove and the third groove.

[0018] In the embodiments of the present application, the other oil groove can increase the volume of the oil groove and contain more lubricating oil. The other oil groove is connected with the one oil groove and the third groove, respectively. The other oil groove allows the lubricating oil to flow smoothly from the one oil groove into the third groove, thereby avoiding the accumulation of lubricating oil in the one oil groove.

[0019] In one embodiment, the side wall of the third groove includes a third oil groove. The length of the third oil groove along the axial direction of the power assembly is greater than or equal to the length of the third groove. One end of the third oil groove along the axial direction of the power assembly penetrates the bottom wall of the other groove. The third oil groove is used to connect the third groove and the other groove.

[0020] In the embodiments of the present application, the third oil groove can increase the volume of the oil groove and contain more lubricating oil. The one oil groove and the third oil groove are connected through the other oil groove. The third oil groove can guide the lubricating oil in the one oil groove into the third groove, thereby avoiding the accumulation of lubricating oil in the other oil groove.

[0021] In one embodiment, the length of the one oil groove along the circumferential direction of the other groove is greater than the length of the third groove. The length of the third oil groove along the circumferential direction of the other groove is smaller than the length of the one oil groove along the circumferential direction of the other groove. This ensures that the third oil groove can guide the lubricating oil in the one oil groove into the third groove, while not affecting the installation of the bearing in the third groove, thereby facilitating the fixation of the bearing in the third groove.

[0022] In an embodiment, the differential is used to connect half shafts, the power assembly comprises a driving motor, a motor shaft of the driving motor is used to arrange with the half shafts along a radial direction of the motor shaft, and a side wall of the other groove comprises at least two one oil grooves, the two one oil grooves are arranged along a circumferential direction of the other groove and are respectively located on two sides of an axis of the other groove along a direction of the motor shaft towards the half shafts.

[0023] In the embodiment, the at least two one oil grooves can accommodate more lubricating oil, and ensure that more lubricating oil can enter the third groove to cool and lubricate the bearing, thereby improving the cooling and lubricating effect of the bearing. The two one oil grooves are arranged along the circumferential direction of the other groove and are respectively located on two sides of the axis of the other groove along the direction of the motor shaft towards the half shafts, so that the working conditions of the electric vehicle during forward driving and backward driving can be considered, and it is ensured that the lubricating oil can splash into the one oil groove to further provide lubricating oil for the bearing in the third groove during forward driving and backward driving of the electric vehicle, thereby enhancing the adaptability of the power assembly under different working conditions.

[0024] In an embodiment, the outer wall surface comprises an oil outlet, and the distances from the two one oil grooves to the oil outlet along a direction of the one groove towards the oil outlet are different. The electric vehicle has a forward driving working condition and a backward driving working condition. When the electric vehicle is in the forward driving and backward driving working conditions, the vehicle speed of the electric vehicle changes, the rotation speed of the gear and the differential output changes, and correspondingly, the direction and speed of the lubricating oil splashing also change. The distances from the two one oil grooves to the oil outlet along the direction of the one groove towards the oil outlet are different, so that the lubricating demand of the bearing of the electric vehicle under different working conditions can be met, and the lubricating and heat dissipation effects of the bearing are ensured.

[0025] In an embodiment, the lengths of the two one oil grooves along the circumferential direction of the other groove are different, and the two one oil grooves have different volumes. The two one oil grooves can store lubricating oil with different volumes, and the size of the one oil groove can be adaptively designed according to different working conditions of the electric vehicle, so as to adapt to the cooling and lubricating demand of the bearing of the electric vehicle under different working conditions.

[0026] In an embodiment, the end cover comprises a fourth groove, the fourth groove, the one groove and the other groove are arranged along an axial direction of the power assembly in sequence, and the other end of the differential in the axial direction is used to pass through a slot of the one groove and extend into the fourth groove.

[0027] In the embodiments of the present application, the fourth groove, the one groove and the another groove are arranged in sequence along the axial direction of the power assembly, the axes of the fourth groove, the one groove and the another groove are collinear, which facilitates the other end of the shaft of the differential gear to extend into the third groove from the another groove through the another through hole. Meanwhile, it is convenient for the lubricating oil to flow from the one groove into the fourth groove, thereby saving the flow path of the lubricating oil.

[0028] In one embodiment, the minimum distance between the groove opening of the fourth groove and the differential gear along the axial direction of the power assembly is in the range of 2mm to 4mm. The minimum distance between the groove opening of the fourth groove and the differential gear along the axial direction of the power assembly is in the range of 2mm to 4mm, which facilitates the fourth groove to better match the shape of the gears in the one groove and the differential gear, and facilitates more lubricating oil to flow from the one groove into the fourth groove to cool and lubricate the bearing in the fourth groove.

[0029] In one embodiment, the length of the one groove along the axial direction of the power assembly is greater than the distance between the groove opening of the fourth groove and the groove bottom of the one groove, the groove opening of the fourth groove can extend into the one groove, and the other end of the shaft of the differential gear can extend into the one groove. Meanwhile, the flow path of the lubricating oil from the one groove into the fourth groove can be shortened, and the lubricating oil can more easily enter the fourth groove to lubricate the bearing.

[0030] In one embodiment, the differential gear is used to connect half shafts, the power assembly includes a driving motor, a motor shaft of the driving motor is arranged along the radial direction of the motor shaft and the half shafts, the side wall of the fourth groove includes at least two fourth oil grooves, the length of the fourth oil groove along the axial direction of the power assembly is greater than or equal to the length of the fourth groove, the fourth oil groove is used to communicate the one groove and the fourth groove, and the two fourth oil grooves are arranged at intervals along the circumferential direction of the fourth groove and are respectively located on both sides of the axis of the fourth groove along the direction of the motor shaft towards the half shafts.

[0031] In the embodiments of the present application, the fourth oil groove is used to contain and store lubricating oil, when the gears and the differential gear rotate, the lubricating oil will be thrown out and splash into the fourth groove due to the centrifugal force, the splash lubricating oil is collected and stored by the fourth oil groove, and the lubricating oil in the fourth oil groove cools and lubricates the bearing in the fourth groove. The at least two fourth oil grooves can contain more lubricating oil, which ensures that more lubricating oil can cool and lubricate the bearing in the fourth groove, thereby improving the cooling and lubricating effect on the bearing.

[0032] Two fourth oil grooves are arranged along the circumference of the fourth groove, and the two fourth oil grooves are respectively located on both sides of the axis line of the fourth groove in the direction of the motor shaft towards the half shaft, so as to consider the working conditions when the electric vehicle moves forward and backward, and ensure that the lubricating oil can splash into the fourth oil groove along with the rotation of the gear and the differential, and then provide lubricating oil for the bearing in the third oil groove, thereby enhancing the adaptability of the power assembly under different working conditions.

[0033] In a second aspect, the application provides an electric vehicle comprising a plurality of wheels and the power assembly of any one of the first aspect, wherein the power assembly is used to drive the plurality of wheels. In the power assembly of the electric vehicle, the amount of lubricating oil used to cool and lubricate the bearing is more, the effect of cooling and lubricating the bearing is improved, the overall performance of the electric vehicle is better, and the service life of the electric vehicle is higher. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A schematic diagram of an electric vehicle provided by an embodiment of the application;

[0035] Figure 2 A schematic diagram of a power assembly provided by an embodiment of the application;

[0036] Figure 3 Another schematic diagram of a power assembly provided by an embodiment of the application;

[0037] Figure 4 A cross-sectional schematic diagram of a power assembly provided by an embodiment of the application;

[0038] Figure 5 A schematic diagram of part of the structure of a power assembly provided by an embodiment of the application;

[0039] Figure 6 A schematic diagram of a groove and another groove provided by an embodiment of the application;

[0040] Figure 7 Another schematic diagram of a power assembly provided by an embodiment of the application;

[0041] Figure 8 A schematic diagram of a gear, a differential, a groove and another groove provided by an embodiment of the application;

[0042] Figure 9 A schematic diagram of an oil groove provided by an embodiment of the application;

[0043] Figure 10 A schematic diagram of an oil groove, another oil groove and a third oil groove provided by an embodiment of the application;

[0044] Figure 11 A schematic diagram of an oil groove provided by an embodiment of the application;Figure 10 Enlarged view at A;

[0045] Figure 12 Schematic view of the relationship of one oil groove, another oil groove and a third oil groove provided for embodiments of the present application;

[0046] Figure 13 Schematic view of Figure 12 Enlarged view at B;

[0047] Figure 14 Another schematic view of a power assembly provided for embodiments of the present application;

[0048] Figure 15 Schematic view of Figure 14 Enlarged view at C;

[0049] Figure 16 Schematic view of an end cap and one recess provided for embodiments of the present application;

[0050] Figure 17 Schematic view of an end cap provided for embodiments of the present application;

[0051] Figure 18 Another schematic view of an end cap provided for embodiments of the present application. DETAILED DESCRIPTION

[0052] The embodiments of the present application will be described below in conjunction with the drawings of the embodiments of the present application.

[0053] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work, fall within the scope of protection of the present application.

[0054] During the working process of the power assembly, the driving motor and the reducer and other structures will rotate and generate a large amount of heat to increase the temperature inside the power assembly, and the reducer and the driving motor and other structures will be worn in the long-term rotating state. The power assembly uses lubricating oil to cool and lubricate the transmission shaft or bearing and other structures to reduce the temperature and reduce the wear, so as to ensure the safe operation of the power assembly and improve the working performance of the power assembly. The lubricating oil is stored at the bottom of the reducer accommodating cavity of the power assembly, and the lubricating oil will immerse part of the gears of the reducer. Part of the lubricating oil will pass through the internal oil channel of the shell to cool and lubricate the entire power assembly. Another part of the lubricating oil will splash with the centrifugal force when the reducer rotates and be driven to the bearing of the reducer to cool and lubricate the bearing, which is called passive lubrication. However, the passive lubrication mode is limited by the rotating speed of the reducer, and the rotating speed of the reducer is too low to cause the movement of the lubricating oil to lack enough power to flow into the bearing, so that the bearing is difficult to be cooled and lubricated by enough lubricating oil, which affects the cooling and lubrication effect.

[0055] To solve the above problems, the present application provides a power assembly, the shell of the power assembly includes a groove on the outer wall surface of one end of the power assembly in the axial direction of the power assembly, one groove is used to enclose the gear and the differential of the reducer with the end cover, the gear is used to connect the differential, wherein: the bottom wall of one groove includes another groove, the end cover, one groove and another groove are used to arrange in sequence along the axial direction of the power assembly, the inner diameter of another groove is smaller than the inner diameter of one groove, and the differential is used to extend into another groove through the bottom wall of one groove. In the power assembly provided by the present application, one groove is matched with the shape of the gear, another groove is matched with the shape of the differential, the spacing between the side wall of one groove and the side wall of the gear is reduced, the spacing between the side wall of another groove and the side wall of the differential is reduced, and the rotation of the gear and the differential carries the lubricating oil to a higher position, so that more lubricating oil can flow from one groove into the bearing for cooling and lubricating the bearing, the oil amount of the lubricating oil used for cooling and lubricating the bearing of the reducer is increased, and the cooling and lubrication effect of the bearing is improved.

[0056] The embodiment of the present application provides an electric vehicle. Figure 1 The schematic diagram of the electric vehicle provided by the embodiment of the present application is shown in Figure 1As shown, the electric vehicle 1 includes a powertrain 10 and multiple wheels 20. The powertrain 10 is the power source of the electric vehicle 1, and the powertrain 10 and wheels 20 are connected in a transmission manner. The powertrain 10 drives the multiple wheels 20 to propel the electric vehicle 1. In one embodiment, the electric vehicle 1 is a front-wheel drive vehicle or a rear-wheel drive vehicle, and the powertrain 10 drives the front wheels or rear wheels of the electric vehicle 1. In one embodiment, the electric vehicle 1 is a four-wheel drive vehicle, and the powertrain 10 drives all four wheels 20 of the electric vehicle 1. In one embodiment, the electric vehicle 1 further includes a power battery 30, and the powertrain 10 receives power from the power battery 30 and drives the wheels 20 to rotate.

[0057] In this embodiment, the electric vehicle 1 includes a two-wheeled, three-wheeled, or four-wheeled vehicle. In this embodiment, the electric vehicle 1 includes a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), and a range-extended electric vehicle (REEV). In one embodiment, the electric vehicle 1 is a means of transportation, such as a commercial vehicle, passenger car, motorcycle, or flying car.

[0058] This application provides a powertrain embodiment. Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application. (See attached diagram.) Figure 2 As shown, the powertrain 10 includes a drive motor 100 and a reducer 200. The drive motor 100 is used to drive the reducer 200. The drive motor 100 drives the wheels 20 of the electric vehicle 1 through the reducer 200.

[0059] In one embodiment, the reducer 200 includes a drive shaft 210, a gear 220, and a differential 230, which is drively connected between the reducer 200 and the wheel 20. When the electric vehicle 1 turns or travels on uneven roads, the differential 230 enables the left and right wheels 20 of the electric vehicle 1 to roll at different speeds, ensuring that the wheels 20 always maintain a rolling motion, thereby improving the driving performance of the electric vehicle 1.

[0060] The transmission shaft 210 of the speed reducer 200 is in transmission connection with the differential 230 through the gear 220. The transmission shaft 210 comprises an input shaft 211 and an intermediate shaft 212, wherein the input shaft 211 receives the power transmitted by the motor shaft 110 of the driving motor 100 and transmits the power to the intermediate shaft 212 through the gear 220, the intermediate shaft 212 transmits the power to the differential 230 through the gear 220, the differential 230 is in transmission connection with the half shaft 40, the half shaft 40 is in transmission connection with the wheel 20, the speed reducer 200 receives the power transmitted by the motor shaft, transmits the power to the differential 230 through the gear, and the differential 230 transmits the power to the half shaft 40 to drive the wheel 20 to rotate.

[0061] In an embodiment, Figure 3 Another schematic view of the power assembly provided by the embodiment of the application is shown in FIG. 2. Figure 3 As shown in the figure, the power assembly 10 comprises a driving motor 100, a speed reducer 200 and a motor controller 300. The motor controller 300 is configured to receive power supply from the power battery 30, the motor controller 300 is configured to convert the direct current into alternating current and transmit the alternating current to the driving motor 100, the driving motor 100 converts the electric energy into mechanical energy, and the driving motor 100 is configured to be in transmission connection with the speed reducer 200. The power output by the driving motor 100 can be transmitted to the speed reducer 200, and then transmitted to the driving wheel 20 after the speed reduction and torque increase of the speed reducer 200, so as to drive the electric vehicle 1 to travel.

[0062] The power assembly 10 provided by the embodiment of the application will be described in detail below. For the convenience of description, in the description of the embodiment of the application, Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 、 Figure 9 、 Figure 12 、 Figure 14 、 Figure 16 and Figure 17 , the axial direction of the power assembly 10 is the X direction or a direction parallel to the X direction, the driving motor 100 is located at one end of the power assembly 10 in the negative X direction, the speed reducer 200 is located at one end of the power assembly in the positive X direction, the radial direction of the power assembly 10 is perpendicular to the axial direction of the power assembly 10, and the following description is the same as this.

[0063] Figure 4 A cross-sectional view of the power assembly provided by the embodiment of the application is shown in FIG. 3. Figure 5 A schematic view of part of the structure of the power assembly provided by the embodiment of the application is shown in FIG. 4. Figure 4 and Figure 5As shown, the housing 400 of the power assembly 10 includes a recess 410 on the wall surface of the power assembly 10 along the axial direction of the power assembly 10. The recess 410 is used to enclose the gear 220 of the reducer 200 and the differential 230. The gear 220 is used to connect with the transmission shaft of the reducer 200 to receive the power transmitted by the transmission shaft. The gear 220 is used to connect with the differential 230. The differential 230 is fixedly connected with the gear 220. The differential 230 receives the power transmitted by the gear 220 and rotates synchronously with the gear 220. In an embodiment, the gear 220 is fixedly connected with the housing of the differential 230. The recess 410 is used to accommodate the gear 220 and the part of the differential 230 fixedly connected with the gear 220.

[0064] The recess 410 is also used to store lubricating oil. The lubricating oil can form a lubricating film between the relatively moving parts to reduce the friction between the parts and prolong the service life. At the same time, the lubricating oil can also cool and dissipate heat between the parts of the power assembly 10. The part of the gear 220 in the recess 410 is partially immersed in the lubricating oil. When the gear 220 rotates, it can stir the lubricating oil in the recess 410. The lubricating oil splashes and is thrown out of the recess 410 under the centrifugal force of the gear 220.

[0065] Continuing to refer to Figure 4 As shown, the bottom wall of the recess 410 includes another recess 420. The bottom wall of the recess 410 is the wall arranged opposite to the slot of the recess 410. In the embodiment of the application, the slot of the recess 410 faces the negative direction of X. The wall of the recess 410 in the positive direction of X is the wall of the recess 410 in the circumferential direction, which is the side wall of the recess 410, and the same below. The end cover 500, the recess 410 and the other recess 420 are arranged along the axial direction of the power assembly 10 in sequence. The recess 410 and the other recess 420 are coaxially arranged. The axis of the recess 410 and the other recess 420 are collinear. The direction of the axis of the recess 410 and the other recess 420 is parallel to the axial direction of the power assembly 10.

[0066] Figure 6 A schematic view of the recess and the other recess provided in the embodiment of the application is shown in Figure 5 and Figure 6As shown, the bottom wall of the one recess 410 includes a through hole 411, the through hole 411 penetrates the bottom wall of the one recess 410 along the axial direction of the power assembly 10, and the through hole 411 communicates the two sides of the one recess 410 along the axial direction of the power assembly 10. The one recess 410 and the other recess 420 along the axial direction of the power assembly 10 are communicated by the through hole 411. The axes of the one recess 410, the through hole 411 and the other recess 420 are collinear, which facilitates the differential 230 to pass through the through hole 411 from the one recess 410 to the other recess 420, and at the same time, the lubricating oil flows from the one recess 410 to the other recess 420 through the through hole 411, thereby saving the flow path of the lubricating oil.

[0067] It should be understood that "one", "another" and "third" and the like used in the present application are only used for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance, nor indicating or implying sequence.

[0068] The opening of the other recess 420 along the axial direction of the power assembly 10 and the opening of the one recess 410 are oriented in the same direction. The inner diameter of the one recess 410 is R1, and the inner diameter of the other recess 420 is R2, and the inner diameter R2 of the other recess 420 is smaller than the inner diameter R1 of the one recess 410, and the differential 230 is used to pass through the bottom wall of the one recess 410 to extend into the other recess 420, and the other recess 420 is used to accommodate part of the differential 230. In the embodiment of the present application, the gear 220 is sleeved on the outside of the differential 230, the radial length of the gear 220 is greater than the radial length of the differential 230, the opening of the other recess 420 along the axial direction of the power assembly 10 and the opening of the one recess 410 are oriented in the same direction, and the inner diameter R2 of the other recess 420 is smaller than the inner diameter R1 of the one recess 410, which can ensure that the differential 230 passes through the bottom wall of the one recess 410 to extend into the other recess 420 when installed. The inner diameter R1 of the one recess 410 is larger, and the larger one recess 410 provides sufficient space to accommodate the gear 220. The inner diameter R2 of the other recess 420 is smaller, which is used to accommodate the differential 230 with a radial length smaller than the gear 220. The one recess 410 and the other recess 420 present a stepped recess design, which can utilize recesses with different inner diameters to adapt to the different sizes of the gear 220 and the differential 230, both meeting the large size installation requirements of the gear 220 and the small size installation requirements of the differential 230.

[0069] The power assembly 10 provided in the present application, one recess 410 is adapted to the shape of the gear 220, and the other recess 420 is adapted to the shape of the differential 230, so that the distance between the side wall of the one recess 410 and the side wall of the gear 220 is reduced, and the distance between the side wall of the other recess 420 and the side wall of the differential 230 is reduced. The design of the one recess 410 and the other recess 420 is more suitable for the shape of the gear 220 and the differential 230. The side wall of the one recess 410 and the side wall of the gear 220, and the side wall of the other recess 420 and the side wall of the differential 230 form the flow path of the lubricating oil. The cooperation between the side wall of the one recess 410 and the side wall of the gear 220 helps to concentrate and guide the lubricating oil thrown out from the gear 220, and the cooperation between the side wall of the other recess 420 and the side wall of the differential 230 helps to concentrate and guide the lubricating oil thrown out from the differential 230. The rotation of the gear 220 and the differential 230 carries the lubricating oil to a higher position, so that more lubricating oil can flow from the one recess 410 to the other recess 420 along the flow path. The lubricating oil in the other recess 420 continues to be thrown out of the other recess 420 with the rotation of the differential 230, and finally enters the bearing 240 to cool and lubricate the bearing 240.

[0070] In one embodiment, referring to FIG. 1, Figure 6 In one embodiment, referring to FIG. 1, In one embodiment, the side wall of the other recess 420 is inclined towards the axis of the other recess 420 in the direction from the opening to the bottom of the other recess 420. In the embodiment of the present application, the direction of the opening of the other recess 420 is the X negative direction, the direction of the bottom of the other recess 420 is the X positive direction, the axis of the other recess 420 is parallel to the X direction, and the other recess 420 is symmetrical along the axis of the other recess 420. The bottom of the one recess 410 is communicated with the other recess 420, the side wall of the one recess 410 is inclined towards the axis of the other recess 420 in the X positive direction, and the inner diameter of the other recess 420 gradually decreases from the opening to the bottom. In one embodiment, the inner diameter of the other recess 420 decreases linearly from the opening to the bottom. The side wall of the other recess 420 is inclined towards the axis of the other recess 420 in the direction from the opening to the bottom of the other recess 420, so that the other recess 420 can be matched with the shape of the differential 230 and the flow path of the lubricating oil is optimized. Specifically, when the lubricating oil enters the other recess 420, the side wall of the other recess 420 is inclined, so that the lubricating oil is guided by the centrifugal force and the inclined side wall during the operation of the differential 230, the lubricating oil flows along the inclined side wall, and the lubricating oil is effectively transported out of the other recess 420, thereby avoiding the problem of insufficient lubricating oil for cooling and lubricating the bearing 240 caused by the accumulation of the lubricating oil between the side wall of the other recess 420 and the side wall of the differential 230.

[0071] The inclined side wall of the other recess 420 can form a guide slope when the differential 230 is installed, guiding the installation of the differential 230 and making it easier for the differential 230 to enter the other recess 420 during installation, avoiding friction between the differential 230 and the side wall of the other recess 420 during installation.

[0072] In an embodiment, Figure 7 Another schematic diagram of the power assembly is provided in the embodiment of the present application, as shown in Figure 7 As shown, the inner wall surface of the other recess 420 is arc-shaped. The inner wall surface of the other recess 420 refers to the surface of at least one of the side wall and the bottom wall of the other recess 420. The side wall of the other recess 420 refers to the wall of the other recess 420 in the circumferential direction. The bottom wall of the other recess 420 refers to the wall opposite to the slot of the other recess 420. In the embodiment of the present application, the bottom wall of the other recess 420 is the wall of the other recess 420 in the positive X direction, which is the same below. The arc-shaped surface is smooth and has no protrusions or depressions, which will not hinder the flow of lubricating oil. The cross section of the other recess 420 perpendicular to the axial direction of the other recess 420 is circular, and the distance from any point on the outer edge of the cross section to the center of the cross section is equal. The distance from any point on the surface of the bottom wall of the other recess 420 to the slot of the other recess 420 is equal, and the inner wall surface of the other recess 420 is smooth. The inner wall surface of the other recess 420 is arc-shaped, and the inner wall surface is smooth, which can reduce the resistance of the lubricating oil during flow and improve the flowability of the lubricating oil. At the same time, the smooth arc-shaped surface can avoid the lubricating oil remaining in the other recess 420, ensuring that more lubricating oil flows out of the other recess 420 to the bearing 240 for cooling and lubrication of the bearing 240.

[0073] In an embodiment, as shown in Figure 6 As shown, the length of the one recess 410 in the axial direction of the power assembly 10 is D1, which is the distance from the slot to the bottom of the one recess 410, and is the depth of the one recess 410. The length of the other recess 420 in the axial direction of the power assembly 10 is D2, which is the distance from the slot to the bottom of the other recess 420, and is the depth of the other recess 420. The length D2 of the other recess 420 in the axial direction of the power assembly 10 is greater than the length D1 of the one recess 410. In the embodiment of the present application, the differential 230 has more internal gear assemblies, which requires more space for installation of the differential 230. The length D2 of the other recess 420 in the axial direction of the power assembly 10 is greater than the length D1 of the one recess 410, so that the other recess 420 can accommodate more differentials 230, which is conducive to better matching of the other recess 420 and the differential 230. In an embodiment, the internal gear assemblies of the differential 230 include planetary gears and half shaft gears, etc.

[0074] In one embodiment, Figure 8 A schematic diagram of the gear, differential, one groove, and another groove provided in the embodiments of this application is shown in the attached diagram. Figure 8 As shown, the differential 230 is located within another recess 420. The distance between the sidewall of the other recess 420 and the sidewall of the differential 230 along the radial direction of the powertrain 10 is L1. Along the axial direction of the powertrain 10, the radial dimension of the differential 230 gradually decreases, while the distance between the sidewall of the other recess 420 and the sidewall of the differential 230 gradually increases along the axial direction of the powertrain 10. The distance L1 between the sidewall of the other recess 420 and the sidewall of the differential 230 along the radial direction of the powertrain 10 can be the average distance between the sidewall of the other recess 420 and the sidewall of the differential 230. The distance L1 between the sidewall of the other recess 420 and the sidewall of the differential 230 along the radial direction of the powertrain 10 is in the range of 2 mm to 4 mm. L1 can be 2 mm, 3 mm, or 4 mm, etc.

[0075] If the distance between the sidewall of the other groove 420 and the sidewall of the differential 230 is too small, the flow path of the lubricating oil between the sidewall of the other groove 420 and the sidewall of the differential 230 will be too narrow, increasing the resistance to the flow of lubricating oil and hindering its flow. If the distance between the sidewall of the other groove 420 and the sidewall of the differential 230 is too large, the lubricating oil will splash and disperse, failing to maintain a concentrated flow path. The lubricating oil will not easily flow to the bearing 240, resulting in less lubricating oil at the bearing 240 and affecting the cooling and lubrication effect of the bearing 240.

[0076] In this embodiment, the distance L1 between the sidewall of the other groove 420 along the radial direction of the powertrain 10 and the sidewall of the differential 230 is in the range of 2 mm to 4 mm. The size of the other groove 420 can be adaptively designed according to the size of the differential 230 itself to ensure that the size and shape of the other groove 420 are more matched with the size and shape of the differential 230 located in the other groove 420. At the same time, it helps to better constrain the lubricating oil between the sidewall of the differential 230 and the sidewall of the other groove 420, so that the lubricating oil splashes more concentratedly under the action of the differential 230, and flows into the bearing 240 along the flow path formed between the sidewall of the differential 230 and the sidewall of the other groove 420, so as to cool and lubricate the bearing 240.

[0077] In one embodiment, see Figure 8As shown, the axial direction of the gear 220 is parallel to the axial direction of the power assembly 10, and the radial direction of the gear 220 is perpendicular to the axial direction of the gear 220. The spacing between the side wall of the one groove 410 and the side wall of the gear 220 along the radial direction of the gear 220 is L2, and when the spacing between the side wall of the one groove 410 and the side wall of the gear 220 along the radial direction of the power assembly 10 is not equal along the axial direction of the power assembly 10, the spacing L2 between the side wall of the one groove 410 and the side wall of the gear 220 along the radial direction of the power assembly 10 can be the average spacing between the side wall of the one groove 410 and the side wall of the gear 220 along the radial direction of the power assembly 10. The spacing L2 between the side wall of the one groove 410 and the side wall of the gear 220 along the radial direction of the gear 220 is in the range of 2 mm to 4 mm. L2 can be 2 mm, 3 mm, or 4 mm, etc.

[0078] If the spacing between the side wall of the one groove 410 and the side wall of the gear 220 along the radial direction of the gear 220 is too small, the flow path of the lubricating oil between the side wall of the one groove 410 and the side wall of the gear 220 is too narrow, the resistance of the lubricating oil flow is increased, and the flow of the lubricating oil is hindered. If the spacing between the side wall of the one groove 410 and the side wall of the gear 220 is too large, the lubricating oil is splashed and dispersed, the concentrated flow path cannot be maintained, the lubricating oil is not easy to flow into another groove 420, the amount of lubricating oil at the bearing 240 is reduced, and the cooling and lubrication effect of the bearing 240 is affected.

[0079] In the embodiment of the present application, the spacing L2 between the side wall of the one groove 410 and the side wall of the gear 220 along the radial direction of the gear 220 is in the range of 2 mm to 4 mm, and the radial dimension of the one groove 410 can be adaptively designed according to the size of the gear 220 itself, to ensure that the size and shape of the one groove 410 and the gear 220 located in the one groove 410 are more matched. At the same time, it is helpful to better constrain the lubricating oil between the side wall of the gear 220 and the side wall of the one groove 410, so that the lubricating oil is more concentrated under the driving of the gear 220, and flows along the flow path formed between the side wall of the gear 220 and the side wall of the one groove 410 to the bearing 240, to cool and lubricate the bearing 240.

[0080] The distance between the axial gear 220 of the power assembly 10 and the bottom wall of the groove 410 is L3, which is the distance between the side of the gear 220 away from the end cover 500 and the bottom wall of the groove 410. The distance L3 between the axial gear 220 of the power assembly 10 and the bottom wall of the groove 410 is in the range of 2-4 mm. L3 can be 2 mm, 3 mm, or 4 mm, etc. If the distance between the axial gear 220 of the power assembly 10 and the bottom wall of the groove 410 is too small, the flow path between the side wall of the groove 410 and the side wall of the gear 220 is too narrow, the resistance of the lubricating oil flow is increased, which will hinder the flow of the lubricating oil. If the distance between the axial gear 220 of the power assembly 10 and the bottom wall of the groove 410 is too large, the large axial distance may cause the gear to be offset in the axial direction, and also increase the axial size of the power assembly 10.

[0081] In the embodiment of the present application, the distance L3 between the axial gear 220 of the power assembly 10 and the bottom wall of the groove 410 is in the range of 2-4 mm, and the axial size of the groove 410 can be adaptively designed according to the size of the gear 220 itself to ensure the normal operation of the gear 220, which helps to better constrain the lubricating oil between the side wall of the gear 220 and the side wall of the groove 410, and make the lubricating oil more concentrated under the driving of the gear 220. At the same time, it helps to reduce the axial size of the power assembly 10.

[0082] In one embodiment, as shown in Figure 5 , Figure 6 and Figure 7 , the bottom wall of the other groove 420 includes a third groove 430, and the bottom wall of the other groove 420 is the wall of the other groove 420 in the positive direction of X. The groove 410, the other groove 420 and the third groove 430 are arranged in the axial direction of the power assembly in sequence, and the groove 410, the other groove 420 and the third groove 430 are coaxially arranged, the axes of the groove 410, the other groove 420 and the third groove 430 are collinear, and the direction of the axes of the groove 410, the other groove 420 and the third groove 430 is parallel to the axial direction of the power assembly 10.

[0083] The bottom wall of another groove 420 includes another through hole 421, which penetrates the bottom wall of the other groove along the axial direction of the drive motor 100. The other through hole 421 connects the other groove 420 on both sides along the axial direction of the powertrain 10. Along the axial direction of the powertrain 10, the other groove 420 and the third groove 430 are connected by the other through hole 421. The axes of the other groove 420, the other through hole 421, and the third groove 430 are collinear, which facilitates the flow of lubricating oil from one groove 410 through a through hole 411 into another groove 420, saving the flow path of the lubricating oil.

[0084] Along the axial direction of the powertrain 10, the opening of the third groove 430 and the opening of the other groove 420 face the same direction. The inner diameter of the third groove 430 is R3, which is smaller than the inner diameter R2 of the other groove 420, matching the shape of the differential 230. One axial end of the differential 230 is used to extend into the third groove 430 through the bottom wall of the other groove 420. The differential 230 has two ends along the axial direction of the powertrain 10. In this embodiment, the axial end of the differential 230 refers to the end of the differential 230 along the positive X direction. The third groove 430 is located on the side of the other groove 420 in the positive X direction, and the end of the differential 230 in the positive X direction extends into the third groove 430 through the bottom wall of the other groove 420 along the positive X direction. The opening of the third groove 430 and the opening of the other groove 420 face the same direction. The axes of the other groove 420, the other through hole 421 and the third groove 430 are collinear, which makes it easy for one axial end of the differential 230 to pass through the other through hole 421 from the other groove 420 and extend into the third groove 430.

[0085] See Figure 8As shown, the inner wall of the third recess 430 is used to fix the outer ring 241 of the bearing 240 of the decelerator 200, and the inner ring 242 of the bearing 240 is used to fix the differential 230. The inner wall of the third recess 430 refers to at least one of the side wall and the bottom wall of the third recess 430, the side wall of the third recess 430 refers to the wall of the third recess 430 in the circumferential direction, and the bottom wall of the third recess 430 refers to the wall opposite to the slot of the third recess 430, and in the embodiment of the present application, the bottom wall of the third recess 430 is the wall of the third recess 430 in the X positive direction, which is the same below. The bearing 240 comprises the coaxially arranged outer ring 241 and the inner ring 242, and the outer ring 241 surrounds the outer side of the inner ring 242. The bearing 240 is installed in the third recess 430, the third recess 430 is used to fix the outer ring 241 of the bearing 240, and the outer ring 241 of the bearing 240 is fixed with the inner wall of the third recess 430. The inner ring 242 of the bearing 240 is used to be sleeved on the axial one end of the differential 230, and the inner ring 242 of the bearing 240 is fixed with the axial one end of the differential 230, so as to realize the position fixing between the axial one end of the differential 230 and the housing 400, and ensure the stable installation of the axial one end of the differential 230 in the power assembly 10.

[0086] In an embodiment, the inner ring 242 and the outer ring 241 of the bearing 240 have a gap therebetween, and a rolling element is arranged in the gap between the inner ring 242 and the outer ring 241, so that the inner ring 242 and the outer ring 241 of the bearing 240 can relatively rotate with the central axis of the inner ring 242 and the outer ring 241 as the rotation axis, so that the axial one end of the differential 230 can relatively rotate with the housing 400 to output power.

[0087] In an embodiment, the decelerator 200 comprises at least two bearings 240, and the at least two bearings 240 are respectively sleeved on the axial two ends of the differential 230 along the axial direction of the power assembly 10.

[0088] In the embodiment of the present application, the one recess 410, the other recess 420 and the third recess 430 are sequentially communicated along the axial direction of the power assembly 10, the lubricating oil splashes under the stirring of the gear 220 and the differential 230, sequentially flows into the third recess 430 along the inner walls of the one recess 410 and the other recess 420, and cools and lubricates the bearing 240 in the third recess 430.

[0089] In an embodiment, Figure 9 A schematic view of an oil groove provided in the embodiment of the present application is shown in FIG. 6. Figure 7 and Figure 9As shown, the side wall of the other recess 420 comprises an oil groove 422, which is at least partially located on the side wall of the other recess 420. In the embodiment of the present application, the oil groove 422 is used to contain and store lubricating oil. The length of the oil groove 422 in the axial direction of the power assembly 10 is the distance between the two ends of the oil groove 422 in the axial direction of the power assembly 10, the length of the other recess 420 in the axial direction of the power assembly 10 is the distance between the groove bottom and the groove opening of the other recess 420 in the axial direction of the power assembly 10, the length of the oil groove 422 in the axial direction of the power assembly 10 is greater than or equal to the length of the other recess 420, and one end of the oil groove 422 in the axial direction of the power assembly 10 penetrates the bottom wall of the recess 410, and the oil groove 422 is used to communicate the recess 410 and the third recess 430. When the gear 220 rotates, the lubricating oil will be thrown out of the recess 410 and splashed into the other recess 420 due to the centrifugal force, and the splashed lubricating oil is collected and stored in the oil groove 422, and the lubricating oil in the oil groove 422 further flows into the third recess 430 to cool and lubricate the bearing 240.

[0090] It can be understood that the other recess 420 is designed according to the shape of the differential 230, so that the distance between the side wall of the differential 230 and the side wall of the other recess 420 is reduced, the space between the side wall of the differential 230 and the side wall of the other recess 420 that can contain lubricating oil is reduced, and the oil groove 422 is provided on the side wall of the other recess 420. The oil groove 422 can increase the space between the side wall of the differential 230 and the side wall of the other recess 420. The oil groove 422 can collect the lubricating oil thrown out by the gear 220 when rotating, and the lubricating oil collected through the oil groove 422 flows from the oil groove 422 to the third recess 430, thereby cooling and lubricating the bearing 240 in the third recess 430, improving the cooling and lubricating effect of the bearing 240, and improving the performance of the power assembly 10.

[0091] In one embodiment, one oil groove 422 has two ends along the axial direction of the power assembly 10. In the embodiment of the present application, one end of the oil groove 422 penetrates the bottom wall of the recess 410 in the negative X direction, so that the oil groove 422 communicates with the recess 410. The other end of the oil groove 422 extends to the bottom wall of the other recess 420 in the positive X direction. The oil groove 422 is partially located on the side wall of the recess 410 and partially located on the bottom wall of the other recess 420. The length of the oil groove 422 along the axial direction of the power assembly 10 is greater than the length of the other recess 420. The two ends of the oil groove 422 along the axial direction of the power assembly 10 are used to communicate with the recess 410 and the third recess 430, respectively. The lubricating oil in the recess 410 splashes into the other recess 420 with the rotation of the gear 220 and is contained in the oil groove 422, and then flows into the third recess 430 to cool and lubricate the bearing 240. The length of the oil groove 422 along the axial direction of the power assembly 10 is greater than the length of the other recess 420, so that the oil groove 422 can contain more lubricating oil.

[0092] In one embodiment, one oil groove 422 has two ends along the axial direction of the power assembly 10. In the embodiment of the present application, one end of the oil groove 422 penetrates the bottom wall of the recess 410 in the negative X direction, so that the oil groove 422 communicates with the recess 410. The other end of the oil groove 422 extends to the bottom wall of the other recess 420 in the positive X direction. The oil groove 422 is partially located on the side wall of the recess 410 and partially located on the bottom wall of the other recess 420. The length of the oil groove 422 along the axial direction of the power assembly 10 is greater than the length of the other recess 420. The two ends of the oil groove 422 along the axial direction of the power assembly 10 are used to communicate with the recess 410 and the third recess 430, respectively. The lubricating oil in the recess 410 splashes into the other recess 420 with the rotation of the gear 220 and is contained in the oil groove 422, and then flows into the third recess 430 to cool and lubricate the bearing 240. The length of the oil groove 422 along the axial direction of the power assembly 10 is greater than the length of the other recess 420, so that the oil groove 422 can contain more lubricating oil.

[0093] In one embodiment, Figure 10 a schematic view of the relationship between the oil groove, the other oil groove and the third oil groove, Figure 11 a schematic view of the relationship between the oil groove, the other oil groove and the third oil groove, Figure 10 an enlarged view of A in FIG. 8, which is shown in FIGS. 9 and 10, Figure 9 , Figure 10 and Figure 11 the axial direction of the other recess 420 is parallel to the axial direction of the power assembly 10, and the radial direction of the other recess 420 is perpendicular to the axial direction of the other recess 420. The bottom wall of the other recess 420 includes the other oil groove 423, which can increase the volume of the oil groove and contain more lubricating oil. The two ends of the other oil groove 423 along the radial direction of the other recess 420 communicate with the bottom wall of the oil groove 422 and the side wall of the third recess 430, respectively. Figure 12 a schematic view of the relationship between the oil groove, the other oil groove and the third oil groove, Figure 13 a schematic view of the relationship between the oil groove, the other oil groove and the third oil groove,Figure 12 Enlarged view of the middle B, refer to Figure 12 and Figure 13 As shown in the figure, one oil groove 422 partially locates in the side wall of the other groove 420, partially extends to the bottom wall of the other groove 420, and the bottom wall 4221 of one oil groove 422 extends from the side wall of the other groove 420 to the bottom wall of the other groove 420. The bottom wall of the other groove 422 includes a wall of one oil groove 422 facing the center of the other groove 420 in the radial direction of the other groove 420 and a wall of one oil groove 422 facing away from the opening of the other groove 420 in the axial direction of the other groove 420. The side wall 4222 of one oil groove 422 is a wall of one oil groove 422 in the circumferential direction of the other groove 420. The length of the bottom wall of one oil groove 422 in the radial direction of the other groove 420 is L4. The length of the bottom wall of the other groove 423 in the radial direction of the other groove 420 is L5, the length of the bottom wall of the other groove 420 in the radial direction of the other groove 420 is L6, and the sum of the length L4 of the bottom wall of one oil groove 422 and the length L5 of the bottom wall of the other groove 423 in the radial direction of the other groove 420 is greater than the length L6 of the bottom wall of the other groove 420. One end of the other groove 423 in the radial direction of the other groove 420 penetrates the side wall of the third groove 430, and the other groove 423 is used to communicate one oil groove 422 and the third groove 430. The other groove 423 communicates with one oil groove 422 and the third groove 430 respectively, and the other groove 423 allows lubricating oil to flow smoothly from one oil groove 422 into the third groove 430, avoiding the accumulation of lubricating oil in one oil groove 422.

[0094] In one embodiment, as shown in the figures, Figure 9 , Figure 10 and Figure 11 The side wall of the third groove 430 includes a third oil groove 431, which can increase the volume of the oil groove and accommodate more lubricating oil. The length of the third oil groove 431 in the axial direction of the power assembly 10 is the distance between the two ends of the third oil groove 431 in the axial direction of the power assembly 10, and the length of the third groove 430 in the axial direction of the power assembly is the distance between the opening and the bottom of the third groove 430 in the axial direction of the power assembly 10. The length of the third oil groove 431 in the axial direction of the power assembly 10 is greater than or equal to the length of the third groove 430, and one end of the third oil groove 431 in the axial direction of the power assembly 10 penetrates the bottom wall of the other groove 423. The third oil groove 431 is used to communicate the third groove 430 and the other groove 423. One oil groove 422 and the third oil groove 431 are connected through the other groove 423, and the third oil groove 431 can guide the lubricating oil in one oil groove 422 into the third groove 430, avoiding the accumulation of lubricating oil in the other groove 423.

[0095] In one embodiment, the third oil groove 431 has two ends along the axial direction of the power assembly 10. In the embodiment of the present application, the third oil groove 431 penetrates the bottom wall of the other recess 420 at the end in the negative X direction, so that the third oil groove 431 communicates with the other recess 420. The third oil groove 431 extends to the bottom wall of the third recess 430 at the end in the positive X direction, and partially locates on the side wall of the one recess 410 and partially locates on the bottom wall of the third recess 430. The length of the third oil groove 431 along the axial direction of the power assembly 10 is greater than the length of the third recess 430. The two ends of the third oil groove 431 along the axial direction of the power assembly 10 are respectively used to communicate with the other oil groove 423 and the third recess 430. The lubricating oil in the one recess 410 splashes into the other recess 420 with the rotation of the gear 220, is contained in the one oil groove 422, and then flows into the third recess 430 along the other oil groove 423 to cool and lubricate the bearing 240. The length of the one oil groove 422 along the axial direction of the power assembly 10 is greater than the length of the other recess 420, and the one oil groove 422 can contain more lubricating oil.

[0096] In one embodiment, the third oil groove 431 has two ends along the axial direction of the power assembly 10. In the embodiment of the present application, the third oil groove 431 penetrates the bottom wall of the other recess 420 at the end in the negative X direction, so that the third oil groove 431 communicates with the other recess 420. The third oil groove 431 extends to the bottom wall of the third recess 430 at the end in the positive X direction, and partially locates on the side wall of the one recess 410 and partially locates on the bottom wall of the third recess 430. The length of the third oil groove 431 along the axial direction of the power assembly 10 is greater than the length of the third recess 430. The two ends of the third oil groove 431 along the axial direction of the power assembly 10 are respectively used to communicate with the other oil groove 423 and the third recess 430. The lubricating oil in the one recess 410 splashes into the other recess 420 with the rotation of the gear 220, is contained in the one oil groove 422, and then flows into the third recess 430 along the other oil groove 423 to cool and lubricate the bearing 240.

[0097] In one embodiment, refer to Figure 10 and Figure 11As shown, the circumferential direction of the other groove 420 is O direction, the length of one oil groove 422 along the circumferential direction of the other groove 420 is A1, the length of the third oil groove 431 along the circumferential direction of the other groove 420 is A2, and the length A1 of one oil groove 422 along the circumferential direction of the other groove 420 is greater than the length A2 of the third oil groove 431. In the embodiment of the present application, one oil groove 422 is located on the side wall of the other groove 420, the third oil groove 431 is located on the side wall of the third groove 430, the inner diameter of the other groove 420 is greater than the inner diameter of the third groove 430, and the length of the third oil groove 431 along the circumferential direction of the other groove 420 is smaller than the length of one oil groove 422 along the circumferential direction of the other groove 420, which ensures that the third oil groove 431 can guide the lubricating oil in one oil groove 422 into the third groove 430, and at the same time does not affect the installation of the bearing 240 in the third groove 430, facilitating the fixation of the bearing 240 in the third groove 430.

[0098] In one embodiment, referring to Figure 2 and Figure 10 As shown, the differential 230 is used to connect the half shaft 40, and the differential 230 has two ends along the axial direction of the power assembly 10. The two ends of the differential 230 are respectively in driving connection with the half shaft 40, and the half shaft 40 receives power transmitted by the differential 230. The half shaft 40 is used to connect the wheel 20 and transmit power to the wheel 20. The differential 230 can ensure that the left and right wheels of the electric vehicle can rotate at different speeds when the electric vehicle turns. The power assembly 10 includes a driving motor 100, and the driving motor 100 is in driving connection with the reducer 200. The motor shaft of the driving motor 100 is in driving connection with the reducer 200 and drives the wheel 20 of the electric vehicle 1 through the reducer 200. The motor shaft 110 of the driving motor 100 is arranged in parallel with the half shaft 40 along the radial direction of the motor shaft 110.

[0099] The side wall of the other groove 420 includes at least two one oil grooves 422, and the number of one oil grooves 422 is at least two, which can be two, three, or four, etc. The side wall of the other groove 420 includes at least two one oil grooves 422, which can accommodate more lubricating oil, ensuring that more lubricating oil can enter the third groove 430 to cool and lubricate the bearing 240, improving the cooling and lubrication effect of the bearing 240. In the embodiment of the present application, the number of one oil grooves 422 is taken as two for illustration.

[0100] Two one-groove oil tanks 422 are arranged along the circumferential direction of the other groove 420 and are located on both sides of the axis of the other groove 420 in the direction of the motor shaft 110 towards the half shaft 40. In the embodiment of the present application, the direction of the motor shaft 110 towards the half shaft 40 is the Y reverse direction, the axis of the other groove 420 is in the X direction, and the two one-groove oil tanks 422 are located on the Y positive side and the Y reverse side of the axis of the other groove 420 respectively with the axis of the other groove 420 as the boundary.

[0101] The electric vehicle 1 has a forward working condition and a reverse working condition. When the electric vehicle 1 is in the forward and reverse working conditions, the rotating directions of the wheels 20 of the electric vehicle 1 are different, the rotating directions of the gear 220 and the differential 230 are also different, and the directions of the splashing of the lubricating oil are also different. In the embodiment of the present application, the two one-groove oil tanks 422 are located on both sides of the axis of the other groove 420 in the direction of the motor shaft 110 towards the half shaft 40, which can take into account the working conditions of the electric vehicle 1 in the forward and reverse directions, and ensure that the lubricating oil can splash into the one-groove oil tank 422 and then enter the third groove 430 to provide lubricating oil for the bearing 240 in the third groove 430 when the electric vehicle 1 is in the forward and reverse directions, thereby enhancing the adaptability of the power assembly 10 in different working conditions. For example, when the electric vehicle 1 is in the forward direction, the lubricating oil splashes into the one-groove oil tank 422 located on the Y reverse side of the axis of the other groove 420, and when the electric vehicle 1 is in the reverse direction, the lubricating oil splashes into the one-groove oil tank 422 located on the Y positive side of the axis of the other groove 420.

[0102] In one embodiment, referring to Figure 10 As shown in the figure, the outer wall surface 440 includes an oil outlet 441, which is connected with the oil inlet on the end cover 500 and is used to deliver lubricating oil to the end cover 500. The distances of the two one-groove oil tanks 422 to the oil outlet 441 are different in the direction of the one groove 410 towards the oil outlet 441, which can meet the lubricating requirements of the bearing 240 in different working conditions of the electric vehicle 1. In the embodiment of the present application, the one groove 410 and the oil outlet 441 are arranged in the Z direction, and the direction of the one groove 410 towards the oil outlet 441 is the Z reverse direction. The Z direction is the height direction of the power assembly 10, and the oil outlet 441 is located at the bottom of the power assembly 10. In the Z reverse direction, the distances of the two one-groove oil tanks 422 to the oil outlet 441 are different, and the positions of the two one-groove oil tanks 422 in the Z direction are different.

[0103] In an embodiment, two one-oil-grooves 422 are located on the Y positive direction side and the Y negative direction side of the axis of the other groove 420 respectively. The height of the one-oil-groove 422 located on the Y negative direction side of the axis of the other groove 420 in the Z direction is A3, the height of the one-oil-groove 422 located on the Y positive direction side of the axis of the other groove 420 in the Z direction is A4, and the height A3 of the one-oil-groove 422 located on the Y negative direction side of the axis of the other groove 420 in the Z direction is higher than the height A4 of the one-oil-groove 422 located on the Y positive direction side of the axis of the other groove 420 in the Z direction.

[0104] The electric vehicle 1 has a forward working condition and a backward working condition. When the electric vehicle 1 is in the forward and backward working conditions, the speed of the electric vehicle changes, the rotation speed of the gear 220 and the differential 230 changes, and the direction and speed of the splash of the lubricating oil also change accordingly.

[0105] When the electric vehicle 1 is in the forward working condition, the differential 230 has a high rotation speed, and the centrifugal force generated by the differential 230 is large. At this time, the differential 230 with a high rotation speed can bring the lubricating oil to a higher height, and then the lubricating oil falls back into the one-oil-groove 422 located on the Y negative direction side of the axis of the other groove 420 under the action of gravity, and then flows into the third groove 430 to lubricate the bearing 240 in the third groove 430, ensuring the lubrication and heat dissipation effect of the bearing 240 and meeting the lubrication requirement of the bearing 240 when the electric vehicle 1 is in the forward working condition.

[0106] When the electric vehicle 1 is in the backward working condition, the differential 230 has a low rotation speed, and the centrifugal force generated by the differential 230 is small. At this time, the differential 230 with a low rotation speed brings the lubricating oil to a lower height than the differential 230 with a high rotation speed, and then the lubricating oil falls back into the one-oil-groove 422 located on the Y positive direction side of the axis of the other groove 420 under the action of gravity, and then flows into the third groove 430 to lubricate the bearing 240 in the third groove 430, ensuring the lubrication and heat dissipation effect of the bearing and meeting the lubrication requirement of the bearing 240 when the electric vehicle 1 is in the backward working condition.

[0107] In an embodiment, as shown in Figure 10 and Figure 11 two one-oil-grooves 422 have different lengths along the circumference of the other groove 420. Two one-oil-grooves 422 have different lengths along the circumference of the other groove 420, two one-oil-grooves 422 have different volumes, two one-oil-grooves 422 can store lubricating oil with different volumes, and the size of one-oil-groove 422 can be adaptively designed according to different working conditions of the electric vehicle 1 to adapt to the cooling and lubrication requirements of the bearing 240 under different working conditions of the electric vehicle 1.

[0108] In one embodiment, the length of the oil groove 422 located on the Y-negative side of the axis of the other groove 420 along the circumference of the other groove 420 is greater than the length of the oil groove 422 located on the Y-positive side of the axis of the other groove 420 along the circumference of the other groove 420.

[0109] The electric vehicle 1 has a forward working condition and a reverse working condition. The rotating speeds of the wheels of the electric vehicle 1 are different when the electric vehicle 1 is in the forward and reverse working conditions, and the rotating speeds of the gear 220 and the differential 230 are also different, and the splashing speed of the lubricating oil is also different. When the electric vehicle 1 is in the forward working condition, the differential 230 has a relatively high rotating speed, the power assembly 10 generates relatively high heat, and the demand for the lubricating oil is relatively large. The length of the oil groove 422 located on the Y-negative side of the axis of the other groove 420 along the circumference of the other groove 420 is greater, and the oil groove 422 can store more lubricating oil. The lubricating oil flows into the third groove 430, and the cooling and lubricating effects of the bearing 240 in the third groove 430 are improved. When the electric vehicle 1 is in the reverse working condition, the differential 230 has a relatively low rotating speed, the power assembly 10 generates relatively low heat, and the demand for the lubricating oil is relatively small. The length of the oil groove 422 located on the Y-positive side of the axis of the other groove 420 along the circumference of the other groove 420 is small, and the lubricating oil stored in the oil groove 422 can meet the cooling and lubricating demands of the bearing 240 when the electric vehicle 1 is in the reverse working condition.

[0110] In one embodiment, Figure 14 Another schematic view of the power assembly is provided for the embodiments of the present application. Referring to FIG. 6, the power assembly 10 includes a differential 230, a gear 220, a bearing 240, and an oil groove 422. Figure 4 and Figure 14As shown, the end cover 500 and the recess 410 enclose the gear 220 and part of the differential 230 of the reduction gear 200, for protecting the gear 220 and the differential 230. The end cover 500 comprises a fourth recess 510, the fourth recess 510, the recess 410 and the other recess 420 are arranged in sequence along the axial direction of the power assembly 10, the fourth recess 510, the recess 410 and the other recess 420 are coaxially arranged, the axes of the fourth recess 510, the recess 410 and the other recess 420 are collinear, and the direction in which the axes of the fourth recess 510, the recess 410 and the other recess 420 are located is parallel to the axial direction of the power assembly 10. The opening of the fourth recess 510 faces away from the direction in which the opening of the recess 410 faces, and the opening of the fourth recess 510 faces the X positive direction. The opening of the fourth recess 510 faces the opening of the recess 410, the inner diameter of the fourth recess 510 is R4, the inner diameter of the recess 410 is R1, and the inner diameter R4 of the fourth recess 510 is smaller than the inner diameter R1 of the recess 410, which matches the shape of the differential 230. The other end of the differential 230 is used to extend into the fourth recess 510 through the opening of the recess 410. The differential 230 has two ends in the axial direction, and in the embodiment, the other end of the differential 230 refers to the end of the differential 230 in the X negative direction, and the end of the differential 230 in the X negative direction extends into the fourth recess 510 through the opening of the recess 410 in the X negative direction. The opening of the fourth recess 510 faces away from the direction in which the opening of the recess 410 faces, and the axes of the fourth recess 510, the recess 410 and the other recess 420 are collinear, which facilitates the other end of the differential 230 to extend into the third recess 430 from the other recess 420 through the other through hole 421. At the same time, it is convenient for the lubricating oil to flow from the recess 410 into the fourth recess 510, saving the flow path of the lubricating oil.

[0111] The inner wall of the fourth recess 510 bearing 240 is used to fix the outer ring 241 of the bearing 240 of the reduction gear 200, and the inner ring 242 of the bearing 240 is used to fix the differential 230. The bearing 240 comprises the coaxially arranged outer ring 241 and inner ring 242, and the outer ring 241 surrounds the outer side of the inner ring 242. The bearing 240 is installed in the fourth recess 510, the fourth recess 510 is used to fix the outer ring 241 of the bearing 240, and the outer ring 241 of the bearing 240 is fixed with the inner wall of the fourth recess 510. The inner ring 242 of the bearing 240 is used to be sleeved on the other end of the differential 230, and the inner ring 242 of the bearing 240 is fixed with the other end of the differential 230, so as to fix the position between the other end of the differential 230 and the end cover 500, and ensure the stable installation of the other end of the differential 230 in the power assembly 10.

[0112] Figure 15 For Figure 14 Enlarged view at C, continue to refer to Figure 14 And Figure 15 As shown in the fourth groove 510, the other end of the differential 230 is located in the fourth groove 510, and the part of the differential 230 connected with the gear 220 is located in the one groove 410. The minimum distance between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is L7, and the minimum distance between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is the distance between the fourth groove 510 and the differential 230 located in the one groove 410. The minimum distance L7 between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is in the range of 2mm to 4mm, and L7 can be 2mm, 3mm or 4mm, etc. The minimum distance L7 between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is in the range of 2mm to 4mm, which helps to better match the shape of the fourth groove 510 with the gear 220 and the differential 230 in the one groove 410, and facilitates more lubricating oil to flow from the one groove 410 into the fourth groove 510 to cool and lubricate the bearing 240 in the fourth groove 510.

[0113] In one embodiment, Figure 16 The schematic view of the end cover and the one groove provided by the embodiment of the application, refer to Figure 16 As shown in the fourth groove 510, the other end of the differential 230 is located in the fourth groove 510, and the part of the differential 230 connected with the gear 220 is located in the one groove 410. The minimum distance between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is L7, and the minimum distance between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is the distance between the fourth groove 510 and the differential 230 located in the one groove 410. The minimum distance L7 between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is in the range of 2mm to 4mm, and L7 can be 2mm, 3mm or 4mm, etc. The minimum distance L7 between the fourth groove 510 and the differential 230 along the axial direction of the power assembly 10 is in the range of 2mm to 4mm, which helps to better match the shape of the fourth groove 510 with the gear 220 and the differential 230 in the one groove 410, and facilitates more lubricating oil to flow from the one groove 410 into the fourth groove 510 to cool and lubricate the bearing 240 in the fourth groove 510.

[0114] In one embodiment, refer to Figure 2As shown, the differential 230 is used to connect the half shaft 40, and the differential 230 has two ends along the axial direction of the power assembly 10, and the two ends of the differential 230 are respectively in driving connection with the half shaft 40, the half shaft 40 receives the power transmitted by the differential 230, and the half shaft 40 is used to connect the wheels 20 and transmit power to the wheels 20, and the differential 230 can ensure that the left and right wheels of the electric vehicle can rotate at different speeds when the electric vehicle turns. The power assembly 10 comprises a driving motor 100, and the driving motor 100 is in driving connection with the speed reducer 200. The motor shaft of the driving motor 100 is in driving connection with the speed reducer 200 and drives the wheels 20 of the electric vehicle 1 through the speed reducer 200. The motor shaft 110 of the driving motor 100 is arranged in the radial direction of the motor shaft 110 and parallel to the half shaft 40.

[0115] Figure 17 A schematic view of an end cover provided for an embodiment of the present application, Figure 18 Another schematic view of an end cover provided for an embodiment of the present application, referring to Figure 17 and Figure 18 As shown, the side wall of the fourth groove 510 comprises at least two fourth oil grooves 511. In the embodiment of the present application, the fourth oil grooves 511 are used to contain and store lubricating oil. When the gear 220 and the differential 230 rotate, the lubricating oil will be thrown out and splashed into the fourth groove 510 due to the centrifugal force. The splashed lubricating oil is collected and stored in the fourth oil grooves 511, and the lubricating oil in the fourth oil grooves 511 cools and lubricates the bearings 240 in the fourth groove 510.

[0116] The number of the fourth oil grooves 511 is at least two, and the number of the fourth oil grooves 511 can be two, three or four, etc. In the embodiment of the present application, the number of the fourth oil grooves 511 is taken as two for illustration. The side wall of the fourth groove 510 comprises at least two fourth oil grooves 511, and the at least two fourth oil grooves 511 can contain more lubricating oil, so that more lubricating oil can cool and lubricate the bearings 240 in the fourth groove 510, and the cooling and lubricating effect of the bearings 240 is improved.

[0117] The two fourth oil grooves 511 are arranged in the circumferential direction of the fourth groove 510 and are respectively located on the two sides of the axis of the fourth groove 510 in the direction of the motor shaft 110 towards the half shaft 40. In the embodiment of the present application, the direction of the motor shaft 110 towards the half shaft 40 is the Y negative direction, the direction of the axis of the fourth groove 510 is the X direction, and the two fourth oil grooves 511 are respectively located on the Y positive direction side and the Y negative direction side of the axis of the fourth groove 510 with the axis of the fourth groove 510 as a boundary.

[0118] The electric vehicle 1 has a forward working condition and a backward working condition. When the electric vehicle 1 is in the forward and backward working conditions, the rotating directions of the wheels of the electric vehicle 1 are different, the rotating directions of the gear 220 and the differential 230 are different, and the directions of the splashing of the lubricating oil are different. In the embodiment of the present application, the two fourth oil grooves 511 are respectively located on the two sides of the axis of the fourth groove 510 in the direction of the motor shaft 110 towards the half shaft 40, which can take into account the working conditions of the electric vehicle 1 in the forward and backward conditions, and ensure that the lubricating oil can splash into the fourth oil groove 511 with the rotation of the gear 220 and the differential 230 when the electric vehicle 1 is in the forward and backward conditions, so as to further provide the bearing 240 in the third groove 430 with lubricating oil and enhance the adaptability of the power assembly 10 in different working conditions. For example, when the electric vehicle 1 is in the forward condition, the lubricating oil splashes into the fourth oil groove 511 located on the Y negative side of the axis of the fourth groove 510, and when the electric vehicle 1 is in the backward condition, the lubricating oil splashes into the fourth oil groove 511 located on the Y positive side of the axis of the fourth groove 510.

[0119] The side wall of the fourth groove 510 comprises the fourth oil groove 511, and the fourth oil groove 511 is at least partially located on the side wall of the fourth groove 510. The length of the fourth oil groove 511 in the axial direction of the power assembly 10 is greater than or equal to the length of the fourth groove 510, and the fourth oil groove 511 is used to communicate one groove 410 and the fourth groove 510.

[0120] In one embodiment, the fourth oil groove 511 has two ends in the axial direction of the power assembly 10, wherein, in the embodiment of the present application, the end of the fourth oil groove 511 in the X positive direction is in communication with the opening of the fourth groove 510, and the end of the fourth oil groove 511 in the X negative direction extends to the bottom wall of the fourth oil groove 511. The fourth oil groove 511 is partially located on the side wall of one groove 410 and partially located on the bottom wall of the fourth groove 510. The length of the fourth oil groove 511 in the axial direction of the power assembly 10 is greater than the length of the fourth groove 510. The lubricating oil in one groove 410 splashes into the fourth groove 510 with the rotation of the gear 220 and is contained in the fourth oil groove 511, and the lubricating oil in the fourth oil groove 511 cools and lubricates the bearing 240 in the fourth groove 510. The length of the fourth oil groove 511 in the axial direction of the power assembly 10 is greater than the length of the fourth groove 510, and the fourth oil groove 511 can contain more lubricating oil.

[0121] In one embodiment, the fourth oil groove 511 has two ends along the axial direction of the power assembly 10, and in this embodiment, the end of the fourth oil groove 511 in the positive direction of the X axis is connected with the opening of the fourth groove 510, and the fourth oil groove 511 is located in the side wall of the fourth groove 510. The length of the fourth oil groove 511 along the axial direction of the power assembly 10 is equal to the length of the fourth groove 510. The lubricating oil in the fourth groove 510 is splashed into the fourth groove 510 by the rotation of the gear 220, and is contained in the fourth oil groove 511, and the lubricating oil in the fourth oil groove 511 cools and lubricates the bearing 240 in the fourth groove 510.

[0122] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A powertrain, characterized by, The housing of the power assembly comprises a groove along the axial end of the power assembly, the groove is used to accommodate the gear of the speed reducer and the differential and to enclose the gear and the differential with the end cover, the gear is used to connect the differential, wherein: The bottom wall of the groove comprises another groove, the end cover, the groove and the another groove are arranged along the axial direction of the power assembly in sequence, the inner diameter of the another groove is smaller than the inner diameter of the groove, the differential is used to extend into the another groove through the bottom wall of the groove.

2. The powertrain of claim 1, wherein, The side wall of the another groove is inclined towards the axis of the another groove along the direction from the slot to the bottom of the another groove.

3. The powertrain of claim 1 or 2, wherein, The inner wall of the another groove is arc-shaped.

4. The powertrain of any one of claims 1-3, wherein, The length of the another groove along the axial direction of the power assembly is greater than the length of the groove.

5. The powertrain of any one of claims 1-4, wherein, The bottom wall of the another groove comprises a third groove, the groove, the another groove and the third groove are arranged along the axial direction of the power assembly in sequence, the axial end of the differential is used to extend into the third groove through the bottom wall of the another groove, the inner wall of the third groove is used to fix the outer ring of the bearing of the speed reducer, the inner ring of the bearing is used to fix the axial end of the differential.

6. The powertrain of claim 5, wherein, The side wall of the another groove comprises an oil groove, the length of the oil groove along the axial direction of the power assembly is greater than or equal to the length of the another groove, the oil groove penetrates the bottom wall of the groove along the axial end of the power assembly, the oil groove is used to communicate the groove and the third groove.

7. The powertrain of claim 6, wherein, The bottom wall of the another groove comprises another oil groove, the sum of the length of the bottom wall of the oil groove along the radial direction of the another groove and the length of the bottom wall of the another groove is greater than the length of the bottom wall of the another groove, the another oil groove penetrates the side wall of the third groove along the radial end of the another groove, the another oil groove is used to communicate the oil groove and the third groove.

8. The powertrain of claim 7, wherein, The side wall of the third groove comprises a third oil groove, the length of the third oil groove along the axial direction of the power assembly is greater than or equal to the length of the third groove, the third oil groove penetrates the bottom wall of the another oil groove along the axial end of the power assembly, the third oil groove is used to communicate the third groove and the another oil groove.

9. The powertrain of claim 8, wherein, The length of the oil groove along the circumferential direction of the another groove is greater than the length of the third oil groove.

10. The powertrain of any one of claims 6-9, wherein, The differential is used to connect half shafts, the power assembly comprises a driving motor, the motor shaft of the driving motor is arranged along the radial direction of the motor shaft with the half shafts, the side wall of the another groove comprises at least two oil grooves, the two oil grooves are arranged at intervals along the circumferential direction of the another groove and respectively located on both sides of the axis of the another groove along the direction of the motor shaft towards the half shafts.

11. The powertrain of claim 10, wherein, The outer wall surface comprises an oil outlet, the distances from the two oil grooves to the oil outlet along the direction of the groove towards the oil outlet are different.

12. The powertrain of claim 10 or 11, characterized in that, The two oil grooves are different in length along the circumference of the other groove.

13. The powertrain of any one of claims 1-12, wherein, The end cover comprises a fourth groove, the fourth groove, the one groove and the other groove are arranged along the axial direction of the power assembly in sequence, and the other end of the axle of the differential mechanism is used for extending into the fourth groove through the slot of the one groove.

14. The powertrain of claim 13, wherein, The differential mechanism is used for connecting half shafts, the power assembly comprises a driving motor, the motor shaft of the driving motor is used for being arranged along the radial direction of the motor shaft and the half shafts, the side wall of the fourth groove comprises at least two fourth oil grooves, the length of the fourth oil grooves along the axial direction of the power assembly is greater than or equal to the length of the fourth groove, the fourth oil grooves are used for connecting the one groove and the fourth groove, and the two fourth oil grooves are arranged at intervals along the circumference of the fourth groove and are respectively located on the two sides of the axis of the fourth groove along the direction of the motor shaft towards the half shafts.

15. An electric vehicle characterized by comprising: The power assembly comprises a plurality of wheels and the power assembly of any one of claims 1-14, and the power assembly is used for driving the plurality of wheels.

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