Power assembly and electric vehicle

Abstract

The utility model provides a power assembly and an electric vehicle. A shell of the power assembly comprises a speed reducer cavity, and the speed reducer cavity is used for containing an output wheel of a speed reducer in the power assembly. The outer ring of the output wheel is in transmission connection with a middle driving wheel of the reducer. The output wheel comprises an output shaft and an inner ring, the output shaft protrudes out of the output wheel in the axial direction of the output wheel, and the inner surface of the output shaft is used for fixing a driving half shaft of the power assembly. The cavity wall of the speed reducer cavity comprises an output bearing groove which is used for containing one end of the output shaft and an output bearing of the speed reducer. One end of the output shaft is used for receiving oil conveyed by the output bearing groove. Under the condition that the output wheel is used for directly fixing the driving half shaft, the output bearing groove is matched with one end of the output shaft to lubricate the fixedly connected part of the output shaft and the driving half shaft, so that the problem of insufficient lubrication can be relieved, the service lives of the speed reducer and the driving half shaft are prolonged, and the working efficiency of a power assembly is improved.

Description

TECHNICAL FIELD

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

[0002] The power assembly is the power source of a new energy vehicle. In the power assembly, the transmission structure of the speed reducer is used to transmit the power of the driving motor to the driving half shaft, so as to drive the wheels to rotate. In the working process of the power assembly, the transmission structure and the driving half shaft rotate at a high speed. If the lubrication of the position where the transmission structure and the driving half shaft cooperate with each other is insufficient, it may cause serious wear, which is not conducive to improving the service life of the speed reducer and the driving half shaft, and has a negative impact on the normal driving of the vehicle. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide a power assembly and an electric vehicle, which can improve the lubrication efficiency of the position where the speed reducer and the driving half shaft cooperate with each other.

[0004] In a first aspect, the embodiments of the present application provide a power assembly. The housing of the power assembly includes a speed reducer cavity, which is used to accommodate the output wheel of the speed reducer in the power assembly. The outer ring of the output wheel is used to be in transmission connection with the intermediate driving wheel of the speed reducer. The output wheel includes an output shaft, which protrudes from the inner ring of the output wheel along the axial direction of the output wheel. The inner surface of the output shaft is used to fix the driving half shaft of the power assembly. The cavity wall of the speed reducer cavity includes an output bearing groove, which is used to accommodate one end of the output shaft and the output bearing of the speed reducer. The one end of the output shaft is used to receive the oil liquid delivered by the output bearing groove.

[0005] In the existing power assembly, the output wheel and the output shaft are usually in a split structure. The output wheel is fixedly connected to the shell of the differential mechanism. The half shaft gear in the shell is fixedly connected to the driving half shaft. The half shaft gear of the differential mechanism is used to drive the driving half shaft to rotate. In this case, if the lubrication of the position where the half shaft gear and the driving half shaft cooperate with each other is to be realized, the oil can be delivered by the oil channel of the shell, and the oil can also be splashed by the gear shaft assembly in the shell.

[0006] In the embodiments of the present application, the output wheel is integrally formed on the output shaft. Compared with the existing scheme in which the output wheel and the output shaft are split, the embodiments of the present application are beneficial to improving the structural strength of the output wheel and the output shaft as a whole and simplifying the installation process. The inner surface of the output shaft is used to fix the driving half shaft, which is equivalent to that the output wheel can directly transmit the power to the driving half shaft without the help of the differential mechanism. Correspondingly, the embodiments of the present application cannot use the oil channel or the gear shaft assembly of the differential mechanism to lubricate the position where the output shaft and the driving half shaft cooperate with each other. If the holes are directly punched on the outer surface of the output shaft to guide the oil liquid to the inner surface of the output shaft, the structural strength of the output shaft and the output wheel will be damaged. The centrifugal force exerted by the high-speed rotating output shaft on the oil liquid also makes it difficult for the oil liquid to flow to the driving half shaft through the holes on the outer surface of the output shaft.

[0007] In this case, the end of the output shaft is distributed in the output bearing groove, and the oil is guided into the end of the output shaft by the output bearing groove. In the case that the output wheel is used to directly fix the drive half shaft, the lubrication of the output shaft and the drive half shaft can be realized, and the negative impact on the structural strength of the output wheel and the output shaft can be avoided. Since the end of the output shaft is located in the output bearing groove, the groove wall of the output bearing groove can receive the oil splashed due to the high-speed rotation of the output shaft. The oil is guided to the end of the output shaft by the output bearing groove, which is conducive to reducing the loss of oil.

[0008] In an embodiment, the groove wall of the output bearing groove comprises an oil passage hole, and the opening of the oil passage hole faces the groove bottom of the output bearing groove. The end of the output shaft adjacent to the groove bottom of the output bearing groove along the axial direction of the output wheel, and the oil passage hole is used to guide the oil into the end of the output shaft and the output bearing.

[0009] In the embodiment of the present application, the oil passage hole penetrates the groove wall of the output bearing groove along the extension direction of the oil passage hole, and the oil outside the output bearing groove can flow into the output bearing groove through the oil passage hole. Among them, the opening of the oil passage hole faces the groove bottom of the output bearing groove, which is conducive to reducing the difficulty of oil flowing into the inner surface of the output shaft.

[0010] In the embodiment of the present application, the oil passage hole is used to send oil, which can lubricate the output shaft and the output bearing, and is conducive to improving the lubrication efficiency. The oil passage hole can be suitable for active lubrication and passive lubrication, so that the lubrication method of the output shaft and the drive half shaft in the embodiment of the present application can be applied to different application scenarios.

[0011] In an embodiment, the opening direction of the oil passage hole intersects the radial direction of the output wheel, and the opening of the oil passage hole faces the groove bottom of the output bearing groove from the output wheel.

[0012] In the embodiment of the present application, since the opening of the oil passage hole close to the inner side of the output bearing groove faces the groove bottom of the output bearing groove, if the opening direction of the oil passage hole is parallel to the radial direction of the output wheel, the opening of the oil passage hole close to the outer side of the output bearing groove will be far away from the output wheel. Whether active lubrication or passive lubrication is used, it is not conducive to the oil passage hole receiving oil. The opening direction of the oil passage hole in the embodiment of the present application intersects the radial direction of the output shaft, which is conducive to reducing the difficulty of the oil passage hole receiving oil and improving the utilization rate of oil.

[0013] In an embodiment, the groove wall of the output bearing groove is protruded towards the output wheel along the axial direction of the output wheel, and the oil guiding rib of the cavity wall of the reducer cavity is connected to the groove wall of the output bearing groove to form an oil collecting groove. The opening of the oil passage hole faces the groove bottom of the output bearing groove from the groove opening of the oil collecting groove.

[0014] In the embodiments of the present application, the groove walls of the output bearing groove and the oil guide ribs protrude towards the output wheel from the cavity wall of the speed reducer cavity, facilitating the formation of the oil collecting groove by the groove walls of the output bearing groove and the oil guide ribs. The oil collecting groove can be applied to at least one lubrication mode of active lubrication or passive lubrication, and is used for collecting and guiding oil to the oil passage. The opening of the oil passage is from the groove opening of the oil collecting groove towards the groove bottom of the output bearing groove, which is beneficial to shorten the transmission path of the oil between the oil collecting groove and the oil passage, and reduce the power loss of the oil.

[0015] In an embodiment, the output shaft is used for driving connection of the intermediate shaft of the speed reducer, the intermediate shaft is used for fixing the intermediate driving wheel and the intermediate driven wheel of the speed reducer, and the oil passage is distributed between the output shaft and the intermediate shaft.

[0016] In the embodiments of the present application, by adjusting the positional relationship between the oil passage and the output shaft and the intermediate shaft, the oil passage can receive the oil thrown out from the intermediate driven wheel, the intermediate driving wheel and the output wheel, the amount of oil used for lubricating the inner surface of the output shaft can be increased, and the wear between the output shaft and the driving half shaft can be reduced. If the oil passage is distributed on the side of the output shaft away from the intermediate shaft, the difficulty of throwing oil from the intermediate driving wheel and the intermediate driven wheel to the oil passage will be increased due to the long distance.

[0017] In an embodiment, the spline on the inner surface of the output shaft is used for fixing the driving half shaft, and the spline is spaced from one end of the output shaft along the axial direction of the output wheel. The inner surface of the output shaft comprises a plurality of oil guide grooves distributed between the one end of the output shaft and the spline.

[0018] In the embodiments of the present application, the output shaft is fixedly connected with the driving half shaft through the spline on the inner surface, and stress may be generated inside the spline during the process of transmitting torque. If the spline is adjacent to the one end of the output shaft, the stress is easily concentrated on the end of the output shaft, causing fatigue damage of the output shaft. In addition, the driving half shaft extends into the output shaft from the one end of the output shaft, and if the spline is adjacent to the one end of the output shaft, there is no transition stage in the process of mounting the driving half shaft to the output shaft, and it is difficult to adjust the position of the driving half shaft during the mounting process. In order to avoid the above problems caused by the spline adjacent to the one end of the output shaft, the positional relationship between the spline and the one end of the output shaft is adjusted in the embodiments of the present application. In this case, in order to realize the flow of oil from the one end of the output shaft to the spline, a plurality of oil guide grooves on the inner surface of the output shaft are used to guide the flow direction of the oil, and the distance between the one end of the output shaft and the spline is compensated.

[0019] In an embodiment, the plurality of oil guide grooves comprises a first oil guide groove, the first oil guide groove is recessed away from the axis of the output wheel along the radial direction of the output wheel. The first oil guide groove extends spirally from the one end of the output shaft to the spline along the axial direction of the output wheel.

[0020] In the embodiment of the present application, the first oil guide groove is distributed between one end of the output shaft and the spline, the output shaft is in a high-speed rotating state during operation, the first oil guide groove is spiral-shaped, and the oil liquid can flow to the spline in a spiral direction under the action of centrifugal force, thereby reducing the power loss of the oil liquid in the transmission path. If the first oil guide groove extends along the axial direction of the output wheel, the centrifugal force exerted by the rotation of the output shaft on the oil liquid will make it difficult for the oil liquid to flow in the axial direction of the output wheel, which is not conducive to the first oil guide groove to guide the flow direction.

[0021] In an embodiment, the inner surface of the output shaft comprises a plurality of first oil guide grooves, and the outlets of the plurality of first oil guide grooves are spaced apart along the circumferential direction of the output wheel.

[0022] In the embodiment of the present application, the outlets of the plurality of first oil guide grooves are used to transmit oil liquid to the spline. The outlets of the plurality of first oil guide grooves are arranged in a spaced-apart manner along the circumferential direction of the output shaft, so that the oil liquid flowing out of the outlets of different first oil guide grooves can be used to lubricate different parts of the spline, thereby improving the coverage of the oil liquid on the spline and reducing the risk of local insufficient lubrication of the spline.

[0023] In an embodiment, the plurality of first oil guide grooves intersect. In the embodiment of the present application, the plurality of intersecting first oil guide grooves form parallel flow channels, which are conducive to reducing the flow resistance of the oil liquid. In addition, compared with the plurality of first oil guide grooves being arranged in a spaced-apart manner along the axial direction of the output wheel, the plurality of first oil guide grooves in the embodiment of the present application are arranged compactly, which can avoid occupying too much space on the inner surface of the output shaft.

[0024] In an embodiment, the inner surface of the output shaft comprises two first oil guide grooves, and the spiral directions of the two first oil guide grooves are opposite.

[0025] In the embodiment of the present application, two first oil guide grooves with opposite spiral directions are used, so that the first oil guide groove is suitable for oil guiding and lubrication in both forward and reverse rotation conditions of the reducer, which is conducive to enhancing the flow direction guiding effect of the first oil guide groove and avoiding the problem of insufficient lubrication of the spline in special scenarios.

[0026] In an embodiment, the power assembly comprises two reducers, and the two reducers are arranged along the axial direction of the output wheel. The spiral direction of one first oil guide groove of one reducer is the same as the spiral direction of one first oil guide groove of the other reducer. The spiral direction of the other first oil guide groove of one reducer is the same as the spiral direction of the other first oil guide groove of the other reducer.

[0027] In the embodiment of the present application, the power assembly comprises two reducers, and the output shaft of each reducer is integrally formed on the output wheel. The inner surface of the output shaft of each reducer can be used to fix a drive half shaft to drive the wheels on both sides to rotate.

[0028] In the case that the two reducers each include only one first oil guide groove, and the direction from the inlet to the outlet of the first oil guide groove of one reducer is opposite to the direction from the inlet to the outlet of the first oil guide groove of the other reducer, in order to make the first oil guide grooves of the two reducers simultaneously meet the oil guiding and lubricating requirement of the forward rotation of the reducers, the helical direction of the first oil guide groove of one reducer needs to be opposite to the helical direction of the first oil guide groove of the other reducer. In this case, the output shaft of one reducer and the output shaft of the other reducer are actually different structures, and the first oil guide groove of one reducer and the first oil guide groove of the other reducer need to be machined respectively, which is not conducive to improving the machining difficulty.

[0029] In the embodiments of the present application, since the two reducers each include two first oil guide grooves with opposite helical directions, the oil guiding requirements of the forward and reverse rotations are taken into account, the machining of the first oil guide groove of one reducer and the machining of the first oil guide groove of the other reducer can share the blank, and it is not necessary to consider the problem that the helical direction of the first oil guide groove of one reducer is opposite to the helical direction of the first oil guide groove of the other reducer, so that the machining difficulty and cost can be reduced while improving the spline lubricating efficiency.

[0030] In one embodiment, the bottom of the output bearing groove includes a shaft hole, and the blocking member of the reducer along the axial direction of the output wheel is used to connect the end surface of one end of the output shaft through the shaft hole. The end surface of one end of the output shaft includes a notch, and the notch is spaced apart from the blocking member along the axial direction of the output wheel. The notch is used to guide the oil from the oil hole to the first oil guide groove.

[0031] In the embodiments of the present application, the driving half shaft penetrates into the output shaft through the shaft hole in the bottom of the output bearing groove. In order to avoid the leakage of the oil flowing from the oil hole into the output bearing groove at the shaft hole, the blocking member can be used to connect the end surface of one end of the output shaft through the shaft hole. Since the oil needs to flow from one end of the output shaft into the first oil guide groove, in the embodiments of the present application, the end surface of one end of the output shaft includes a notch, the notch is spaced apart from the blocking member, and the part of the end surface of one end of the output shaft except the notch is connected with the blocking member, so that the communication between the oil hole and the first oil guide groove can be realized while avoiding the leakage of the oil.

[0032] In one embodiment, the inlet of the first oil guide groove is distributed on the inner surface of the notch, and the distance between the notch and the oil hole along the radial direction of the output wheel is less than the inner diameter of the output bearing groove.

[0033] In the embodiments of the present application, the inlet of the first oil guide groove is distributed on the inner surface of the notch, so that the flow of the oil between the notch and the first oil guide groove is smoother. The notch is closer to the oil hole, which is conducive to shortening the transmission path of the oil and reducing the power loss of the oil.

[0034] In an embodiment, the end surface of one end of the output shaft comprises a plurality of notches, the number of the notches being equal to the number of the first oil guide grooves, and each notch is used to communicate one first oil guide groove. In the embodiment, the plurality of notches can reduce the difficulty of the oil flowing into the output shaft from the oil passage hole, and improve the efficiency of the notches in collecting oil. Each first oil guide groove communicates with one notch, which is conducive to optimizing the oil distribution of different first oil guide grooves in the same reducer and improving the uniformity of lubrication.

[0035] In an embodiment, the plurality of oil guide grooves comprises a second oil guide groove, which is distributed between the first oil guide grooves and the spline along the axial direction of the output wheel, and the inner diameter of the output shaft at the second oil guide groove is greater than the inner diameter of the output shaft at the spline. The outlets of the first oil guide grooves are distributed on the groove bottom of the second oil guide groove, and the second oil guide groove extends along the circumferential direction of the output shaft.

[0036] In the embodiment, the drive half shaft is sequentially installed to the spline of the output shaft through the first oil guide groove and the second oil guide groove. The inner diameter of the output shaft at the second oil guide groove is greater than the inner diameter of the output shaft at the spline, and the second oil guide groove itself can avoid the collision and wear between the drive half shaft and the output shaft during the installation process. The embodiment can realize the reuse of the second oil guide groove: the outlets of the first oil guide grooves are distributed on the groove bottom of the second oil guide groove, the second oil guide groove communicates with the first oil guide grooves, and the oil moves along the circumferential direction of the output shaft under the guidance of the second oil guide groove, which is conducive to increasing the contact area between the oil and the spline and improving the uniformity of lubricating the spline.

[0037] In an embodiment, the output wheel comprises a reinforcing rib, which is connected to the outer surface of the output shaft along the radial direction of the output wheel, and the thickness of the reinforcing rib along the axial direction of the output wheel increases from the outer ring of the output wheel towards the output shaft.

[0038] In the embodiment, the output shaft is integrally formed with the output wheel. The axial thickness of the reinforcing rib near one end of the output shaft is greater than the axial thickness of the reinforcing rib away from the other end of the output shaft. The reinforcing rib can enhance the stiffness of the output wheel and the output shaft, improve the modal frequency, and reduce the negative impact of vibration on the oil transportation in the output shaft. The vibration damping performance of the output wheel and the output shaft is enhanced, which helps to improve the NVH performance of the electric vehicle.

[0039] In a second aspect, the embodiment provides an electric vehicle, which comprises a power battery and a power assembly as described in any one of the embodiments of the first aspect. The power assembly is used to receive power supply from the power battery and drive the wheels of the electric vehicle.

[0040] In the embodiment, the power assembly of the first aspect is applied to the electric vehicle. Since the lubrication effect of the power assembly at the matching position of the output shaft and the drive half shaft is enhanced, the normal driving of the electric vehicle can be ensured, and the safety performance of the electric vehicle is improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be described below.

[0042] Figure 1 is a schematic diagram of an electric vehicle provided by the embodiments of the present application;

[0043] Figure 2 is a schematic diagram of a power assembly provided by the embodiments of the present application;

[0044] Figure 3 is a partial schematic diagram of a reducer provided by the embodiments of the present application;

[0045] Figure 4 is a partial exploded view of a power assembly provided by the embodiments of the present application;

[0046] Figure 5 is a partial exploded view of a power assembly provided by the embodiments of the present application;

[0047] Figure 6 is a cross-sectional view of a housing of a power assembly provided by the embodiments of the present application;

[0048] Figure 7 is a schematic diagram of an output wheel provided by the embodiments of the present application;

[0049] Figure 8 is a cross-sectional view of the output wheel shown in Figure 7 along AA;

[0050] Figure 9 is another cross-sectional view of the output wheel shown in Figure 7 along AA;

[0051] Figure 10 is a schematic diagram of a power assembly provided by the embodiments of the present application;

[0052] Figure 11 is a cross-sectional view of two output wheels provided by the embodiments of the present application;

[0053] Figure 12 is a partial schematic diagram of a power assembly provided by the embodiments of the present application. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments.

[0055] For the convenience of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application will be explained and described below.

[0056] NVH: Noise, Vibration, Harshness, is an English abbreviation for noise, vibration and harshness, used to measure the quality of car design and manufacturing.

[0057] Parallel: The parallel defined in the embodiments of the present application is not limited to absolute parallel. The definition of the parallel can be understood as substantially parallel, allowing for a situation that is not absolutely parallel due to factors such as assembly tolerance, design tolerance, and structure flatness.

[0058] At present, there is a problem of insufficient lubrication at the part where the reduction gear and the drive half shaft are fixedly connected in the power assembly. The embodiments of the present application provide a power assembly. The housing of the power assembly includes a reduction gear cavity, and the reduction gear cavity is used to accommodate an output wheel and an intermediate driving wheel of a reduction gear in the power assembly. The outer ring of the output wheel is used to drivingly connect the intermediate driving wheel. The output wheel includes an output shaft, and the output shaft protrudes from the inner ring of the output wheel along the axial direction of the output wheel. The output shaft is integrally formed with the output wheel. The inner surface of the output shaft is used to fix a drive half shaft of the power assembly. The cavity wall of the reduction gear cavity includes an output bearing groove, and the output bearing groove is used to accommodate one end of the output shaft and an output bearing of the reduction gear. The outer ring of the output bearing is fixed to the output bearing groove, and the inner ring of the output bearing is fixed to the output shaft. The one end of the output shaft is used to receive oil liquid delivered by the output bearing groove.

[0059] In the case where the output wheel directly fixes the drive half shaft, the embodiments of the present application guide the oil liquid to the inner surface of the input shaft through the cooperation of the output bearing groove and the one end of the output shaft, lubricate the part where the output shaft and the drive half shaft are fixedly connected, and can alleviate the problem of insufficient lubrication. The embodiments of the present application are beneficial to prolong the service life of the reduction gear and the drive half shaft and improve the working efficiency of the power assembly. The power assembly provided by the embodiments of the present application can be applied to an electric vehicle.

[0060] Please refer to Figure 1 , Figure 1 The embodiments of the present application provide a schematic diagram of an electric vehicle 1. In an embodiment, the electric vehicle 1 includes a power assembly 10 and a power battery 20. In an embodiment, the electric vehicle 1 further includes a vehicle frame 30, and the vehicle frame 30 is used to mount the power assembly 10 and the power battery 20. The vehicle frame 30 is the structural framework of the electric vehicle 1 and can bear the load of the internal and external environment of the electric vehicle 1. In the embodiments of the present application, the electric vehicle 1 refers to a wheeled device driven or pulled by a power device. The power battery 20 is used to supply power to the power assembly 10, and the power battery 20 can also be referred to as a battery pack. The power assembly 10 is the power source of the electric vehicle 1, and the power assembly 10 is used to drive the wheels 40 of the electric vehicle 1.

[0061] Please refer to Figure 2 , Figure 2A schematic diagram of a power assembly 10 is provided in the embodiments of the present application. It should be noted that Figure 2 The matching relationship of the components of the power assembly 10 is only schematically shown, and does not represent the specific structure, size and position relationship.

[0062] In an embodiment, the power assembly 10 comprises a reducer 100, a drive motor 200 and a motor controller 300. A power battery is configured to supply power to the drive motor 200 through the motor controller 300. The drive motor 200 is configured to convert the power transmitted by the power battery into mechanical energy, and then transmit the mechanical energy to the reducer 100 to drive the rotation of the wheels.

[0063] In an embodiment, the motor controller 300 is configured to convert the direct current transmitted by the power battery into alternating current. In an embodiment, the motor controller 300 is configured to control the drive motor 200 and the reducer 100.

[0064] In an embodiment, the drive motor 200 comprises a stator 210, a rotor 220 and a motor shaft 230. The winding of the stator 210 is connected to the alternating current converted by the motor controller 300 to generate alternating magnetic flux. The alternating magnetic flux generated by the winding interacts with the permanent magnetic flux generated by the rotor 220, so that the rotor 220 rotates relative to the stator 210. The rotor 220 is fixedly connected to the motor shaft 230, so that the motor shaft 230 rotates with the rotor 220. The stator 210 is rotationally connected to the motor shaft 230, so that the motor shaft 230 can rotate relative to the stator 210 to convert the electrical energy into mechanical energy. The output end of the motor shaft 230 is configured to transmit the mechanical energy.

[0065] Please refer to Figure 2 and Figure 3 , Figure 3 A partial schematic diagram of the reducer 100 is provided in the embodiments of the present application. In an embodiment, the rotating shaft and the gear of the reducer 100 are configured to change the transmission ratio between the drive motor 200 and the wheels 40. In an embodiment, the inner ring of the bearing of the reducer 100 is fixed to the rotating shaft of the reducer 100, and the bearing of the reducer 100 is configured to position and support the rotating shaft of the reducer 100. The rotating shaft of the reducer 100 comprises an input shaft 120, an intermediate shaft 130 and an output shaft 111, and the gear of the reducer 100 comprises an input gear 140, an intermediate driven gear 160, an intermediate driving gear 150 and an output gear 110. The input shaft 120 is configured to be transmissionally connected to the motor shaft 230 of the drive motor 200, the intermediate shaft 130 is configured to be transmissionally connected to the input shaft 120 and the output shaft 111, and the output shaft 111 is configured to be transmissionally connected to the drive half shaft 500. The input gear 140 is fixed to the input shaft 120, and the intermediate driven gear 160 and the intermediate driving gear 150 are fixed to the intermediate shaft 130. The input gear 140 is configured to mesh with the intermediate driven gear 160, and the intermediate driving gear 150 is configured to mesh with the output gear 110.

[0066] In the working process of the power assembly, the reducer and the drive half shaft rotate at high speed. If there is a problem of insufficient lubrication at the part where the reducer and the drive half shaft are fixedly connected, it may cause serious wear problem, interfere with the normal work of the reducer and the drive half shaft, and is not conducive to improving the working efficiency and safety performance of the power assembly and the electric vehicle.

[0067] The embodiment of the present application can alleviate the wear problem of the reducer and the drive half shaft by improving the lubrication mode of the reducer and the drive half shaft, and prolong the service life of the reducer and the drive half shaft.

[0068] The power assembly 10 provided by the embodiment of the present application will be described in detail below.

[0069] Please refer to Figures 3 to 6 , Figure 4 the partial exploded view of the power assembly 10 provided by the embodiment of the present application, Figure 5 the partial exploded view of the power assembly 10 provided by the embodiment of the present application, Figure 6 the cross-sectional view of the housing 11 of the power assembly 10 provided by the embodiment of the present application. It should be noted that Figure 4 the drive half shaft 500 in the above figure is only used to schematically show the cooperation relationship between the drive half shaft 500 and the output shaft 111, and does not represent the specific structure and size thereof.

[0070] In an embodiment, the housing 11 of the power assembly 10 includes a reducer cavity 400 for accommodating the output wheel 110 of the reducer 100 in the power assembly 10. The outer ring of the output wheel 110 is used for transmission connection with the intermediate driving wheel 150. The output wheel 110 includes an output shaft 111, which protrudes from the inner ring of the output wheel 110 along the axial direction O of the output wheel 110, and the inner surface of the output shaft 111 is used for fixing the drive half shaft 500. The cavity wall of the reducer cavity 400 includes an output bearing groove 410 for accommodating one end of the output shaft 111 and the output bearing 170 of the reducer 100. The one end of the output shaft 111 is used for receiving the oil liquid delivered by the output bearing groove 410.

[0071] In the existing power assembly, the output wheel and the output shaft are usually a split structure, the output wheel is fixedly connected with the shell of the differential, the half shaft gear in the shell is fixedly connected with the drive half shaft, and the half shaft gear of the differential is used to drive the drive half shaft to rotate. In this case, if the lubrication at the cooperation part of the half shaft gear and the drive half shaft is to be realized, the oil channel of the shell can be used to deliver oil, and the tooth shaft assembly in the shell can also be used to splash oil.

[0072] In the embodiment of the present application, the output wheel 110 is integrally formed with the output shaft 111. Compared with the prior art in which the output wheel and the output shaft are separate, the embodiment of the present application is advantageous in improving the structural strength of the output wheel 110 and the output shaft 111 as a whole and simplifying the mounting process. The inner surface of the output shaft 111 is used to fix the drive half shaft 500. The output wheel 110 can directly transmit power to the drive half shaft 500 without the need of a differential mechanism. Correspondingly, the embodiment of the present application cannot use the oil passage of the differential mechanism or the lubrication of the gear shaft assembly for the joint between the output shaft 111 and the drive half shaft 500. If a hole is directly punched on the outer surface of the output shaft 111 to guide the oil to the inner surface of the output shaft 111, the structural strength of the output shaft 111 and the output wheel 110 will be damaged. The centrifugal force exerted by the high-speed rotating output shaft 111 on the oil also makes it difficult for the oil to flow to the drive half shaft through the hole on the outer surface of the output shaft 111.

[0073] In this case, the embodiment of the present application guides the oil to flow into one end of the output shaft 111 by using the output bearing groove 410. In the case where the output wheel 110 is used to directly fix the drive half shaft 500, the embodiment of the present application can realize the lubrication of the output shaft 111 and the drive half shaft 500 and can also avoid the negative impact on the structural strength of the output wheel 110 and the output shaft 111. Since one end of the output shaft 111 is located in the output bearing groove 410, the groove wall of the output bearing groove 410 can receive the oil splashed due to the high-speed rotation of the output shaft 111. The use of the output bearing groove 410 to guide the oil to one end of the output shaft 111 is advantageous in reducing the loss of oil. In one embodiment, the oil can be any one of ethylene glycol cooling oil, synthetic oil and mineral oil.

[0074] In one embodiment, the housing 11 of the power assembly 10 further includes a motor cavity 600 and an electronic control cavity 700. The motor cavity is used to accommodate a drive motor, and the electronic control cavity is used to accommodate a motor controller. Among them, the reducer cavity 400 and the motor cavity 600 are adjacent along the axial direction O of the output wheel 110, and the electronic control cavity 700 is stacked on the reducer cavity 400 and the motor cavity 600 along the radial direction R of the output wheel 110.

[0075] Please continue to refer to Figure 5 and Figure 6 In one embodiment, the groove wall of the output bearing groove 410 includes an oil passage hole 411, and the opening of the oil passage hole 411 faces the groove bottom of the output bearing groove 410. One end of the output shaft 111 is adjacent to the groove bottom of the output bearing groove 410 along the axial direction O of the output wheel 110, and the oil passage hole 411 is used to guide the oil to the one end of the output shaft 111 and the output bearing 170.

[0076] In the embodiment of the present application, the oil passage hole 411 penetrates the groove wall of the output bearing groove 410 along the extension direction of the oil passage hole 411, and the oil outside the output bearing groove 410 can flow into the output bearing groove 410 through the oil passage hole 411. The opening of the oil passage hole 411 is directed towards the groove bottom of the output bearing groove 410, which is conducive to reducing the difficulty of the oil flowing to the inner surface of the output shaft 111.

[0077] In the embodiment of the present application, the oil passage hole 411 is used to send oil, which can take into account the lubrication of the output shaft 111 and the output bearing 170, and is conducive to improving the lubrication efficiency. In addition, the oil passage hole 411 can be suitable for active lubrication and passive lubrication. For example, in an embodiment, the oil nozzle can be used to spray oil to the oil passage hole 411 to achieve active lubrication of the inner surface of the output shaft 111 and the output bearing 170. In an embodiment, the oil collected by the gear and the rotating shaft can be guided to the oil passage hole 411 to achieve passive lubrication of the inner surface of the output shaft 111 and the output bearing 170. In actual application scenarios, at least one of the active lubrication or passive lubrication can be selected according to the lubrication requirement or the layout requirement of the internal components of the speed reducer 100. The embodiment of the present application can be suitable for different scenarios for the lubrication mode of the cooperation part of the output shaft 111 and the drive half shaft 500, which is conducive to improving the practicability.

[0078] Please continue to refer to Figure 5 and Figure 6 In an embodiment, the opening direction of the oil passage hole 411 intersects the radial direction R of the output wheel 110, and the opening of the oil passage hole 411 is directed from the output wheel 110 to the groove bottom of the output bearing groove 410.

[0079] In the embodiment of the present application, the opening of the oil passage hole 411 close to the inner side of the output bearing groove 410 is directed towards the groove bottom of the output bearing groove 410. If the opening direction of the oil passage hole 411 is parallel to the radial direction R of the output wheel 110, the opening of the oil passage hole 411 close to the outer side of the output bearing groove 410 will be far away from the output wheel 110. Whether active lubrication or passive lubrication is used, it is not conducive to the oil passage hole 411 receiving oil. The opening direction of the oil passage hole 411 of the embodiment of the present application intersects the radial direction of the output shaft 111, which is conducive to reducing the difficulty of the oil passage hole 411 receiving oil and improving the utilization rate of the oil.

[0080] Please continue to refer to Figure 5 and Figure 6 In an embodiment, the groove wall of the output bearing groove 410 protrudes towards the output wheel 110 along the axial direction O of the output wheel 110, and the oil guide rib 420 of the cavity wall of the speed reducer cavity 400 is connected to the groove wall of the output bearing groove 410 to form an oil collecting groove 430. The opening of the oil passage hole 411 is directed from the groove opening of the oil collecting groove 430 to the groove bottom of the output bearing groove 410.

[0081] In the embodiment of the present application, the groove wall of the output bearing groove 410 and the oil guide rib 420 protrude from the cavity wall of the speed reducer cavity 400 towards the output wheel 110, so as to facilitate the formation of the oil collecting groove 430 by the groove wall of the output bearing groove 410 and the oil guide rib 420. The oil collecting groove 430 can be applied to at least one lubrication mode of active lubrication or passive lubrication, and the oil collecting groove 430 is used to collect oil and guide the oil to the oil hole 411. The opening of the oil hole 411 is from the groove opening of the oil collecting groove 430 towards the groove bottom of the output bearing groove 410, which is beneficial to shorten the transmission path of the oil between the oil collecting groove 430 and the oil hole 411 and reduce the power loss of the oil.

[0082] Please continue to refer to Figure 5 and Figure 6 . In an embodiment, the output shaft 111 is used to drive the intermediate shaft 130 of the speed reducer 100, and the intermediate shaft 130 is used to fix the intermediate driving wheel 150 and the intermediate driven wheel 160. The oil hole 411 is distributed between the output shaft 111 and the intermediate shaft 130.

[0083] In the embodiment of the present application, by adjusting the positional relationship between the oil hole 411 and the output shaft 111 and the intermediate shaft 130, the oil hole 411 can receive the oil thrown out from the intermediate driven wheel 160, the intermediate driving wheel 150 and the output wheel 110, which can increase the amount of oil used to lubricate the inner surface of the output shaft 111 and reduce the wear between the output shaft 111 and the drive half shaft 500. If the oil hole 411 is distributed on the side of the output shaft 111 away from the intermediate shaft 130, it will be difficult to throw the oil from the intermediate driving wheel 150 and the intermediate driven wheel 160 to the oil hole 411 due to the long distance. In an embodiment, the oil guide rib 420 and the oil collecting groove 430 are distributed between the output shaft 111 and the intermediate shaft 130, which is beneficial to improve the efficiency of the oil guide rib 420 and the oil collecting groove 430 in collecting oil.

[0084] Please continue to refer to Figure 3 , Figures 7 to 9 , Figure 7 the schematic diagram of the output wheel 110 provided in the embodiment of the present application, Figure 8 is Figure 7 the left half of the output wheel 110 along the AA section, Figure 9 is Figure 7 the other section of the output wheel 110 along the AA section. It can be understood that Figure 8 is Figure 7 the left half of the output wheel 110 along the AA section, Figure 9 is Figure 7 the right half of the output wheel 110 along the AA section.

[0085] In an embodiment, the inner surface of the output shaft 111 is provided with splines 1111 for fixing the drive half shaft 500, and the splines 1111 are spaced from one end of the output shaft 111 along the axial direction O of the output wheel 110. The inner surface of the output shaft 111 includes a plurality of oil guide grooves 1112 distributed between the one end of the output shaft 111 and the splines 1111.

[0086] In the embodiment, the output shaft 111 is fixedly connected with the drive half shaft 500 through the splines 1111 on the inner surface, and stress may be generated inside the splines 1111 during torque transmission. If the splines 1111 are adjacent to the one end of the output shaft 111, stress is likely to concentrate on the end of the output shaft 111, causing fatigue damage of the output shaft 111. In addition, the drive half shaft 500 extends into the output shaft 111 from the one end of the output shaft 111, and if the splines 1111 are adjacent to the one end of the output shaft 111, there is no transition stage in the process of mounting the drive half shaft 500 to the output shaft 111, and it is difficult to adjust the position of the drive half shaft 500 during the mounting process. To avoid the above problems caused by the splines 1111 being adjacent to the one end of the output shaft 111, the embodiment adjusts the positional relationship between the splines 1111 and the one end of the output shaft 111. In this case, in order to realize the flow of oil from the one end of the output shaft 111 to the splines 1111, the plurality of oil guide grooves 1112 on the inner surface of the output shaft 111 are used to guide the flow direction of the oil, making up for the distance between the one end of the output shaft 111 and the splines 1111.

[0087] Please refer to Figure 3 , Figure 8 and Figure 9 for more information. In an embodiment, the plurality of oil guide grooves 1112 includes a first oil guide groove 1113 recessed away from the axis of the output wheel 110 along the radial direction R of the output wheel 110. The first oil guide groove 1113 extends helically from the one end of the output shaft 111 to the splines 1111 along the axial direction O of the output wheel 110.

[0088] In the embodiment, the first oil guide groove 1113 is distributed between the one end of the output shaft 111 and the splines 1111, and the output shaft 111 is in a high-speed rotating state during operation. The first oil guide groove 1113 is helical, which facilitates the flow of oil in the helical direction to the splines 1111 under the action of centrifugal force, reducing the dynamic loss of oil in the transmission path. If the first oil guide groove 1113 extends along the axial direction O of the output wheel 110, the centrifugal force exerted by the rotation of the output shaft 111 on the oil will make it difficult for the oil to flow along the axial direction O of the output wheel 110, which is not conducive to the function of the first oil guide groove 1113 in guiding the flow direction.

[0089] Please refer to Figure 8 and Figure 9In an embodiment, the inner surface of the output shaft 111 comprises a plurality of first oil guiding grooves 1113, and outlets of the plurality of first oil guiding grooves 1113 are spaced along the circumferential direction C of the output wheel 110.

[0090] In the embodiment of the present application, the outlets of the plurality of first oil guiding grooves 1113 are configured to deliver oil to the splines 1111. In the embodiment of the present application, the outlets of the plurality of first oil guiding grooves 1113 are arranged along the circumferential direction of the output shaft 111, so that the oil delivered from the outlets of different first oil guiding grooves 1113 can be used to lubricate different parts of the splines 1111, which can improve the coverage of the oil on the splines 1111 and reduce the risk of insufficient lubrication of the splines 1111.

[0091] In an embodiment, the plurality of first oil guiding grooves 1113 intersect. In the embodiment of the present application, the plurality of intersecting first oil guiding grooves 1113 form parallel flow channels, which can help to reduce the flow resistance of the oil. In addition, compared with the plurality of first oil guiding grooves 1113 arranged along the axial direction O of the output wheel 110, the plurality of first oil guiding grooves 1113 in the embodiment of the present application are arranged compactly, which can avoid occupying too much space on the inner surface of the output shaft 111.

[0092] Please refer to Figure 8 and Figure 9 In an embodiment, the inner surface of the output shaft 111 comprises two first oil guiding grooves 1113, and the helical directions of the two first oil guiding grooves 1113 are opposite.

[0093] In the embodiment of the present application, for the convenience of description, the two first oil guiding grooves 1113 with opposite helical directions are respectively denoted as 1113a and 1113b. Figure 8 The first oil guiding groove 1113a in Figure 9 The first oil guiding groove 1113a in Figure 8 The first oil guiding groove 1113b in Figure 9 The first oil guiding groove 1113b in

[0094] In the embodiment of the present application, the first oil guiding groove 1113a and the first oil guiding groove 1113b with opposite helical directions are used, so that the inner surface of the output shaft 111 is suitable for oil guiding and lubrication in both forward and reverse rotation of the speed reducer 100, which can help to enhance the guiding effect of the first oil guiding groove 1113a and the first oil guiding groove 1113b, and avoid the problem of insufficient lubrication of the splines 1111 in special scenarios. In an embodiment, if the inner surface of the output shaft 111 only comprises one first oil guiding groove 1113, the helical direction of the first oil guiding groove 1113 is the same as the rotation direction of the output shaft 111 when the speed reducer 100 rotates forward.

[0095] Please refer to Figure 10and Figure 11 , Figure 10 a schematic view of a power assembly 10 provided by an embodiment of the present application, Figure 11 a cross-sectional view of two output wheels 110 provided by an embodiment of the present application. It should be noted that, Figure 10 only the matching relationship of the components of the power assembly 10 is schematically shown, and does not represent the specific structure, size and positional relationship thereof.

[0096] In an embodiment, the power assembly 10 includes two reducers 100, which are arranged along the axial direction O of the output wheel 110. The spiral direction of a first oil guide groove 1113 of one reducer 100 is the same as that of a first oil guide groove 1113 of the other reducer 100. The spiral direction of another first oil guide groove 1113 of one reducer 100 is the same as that of another first oil guide groove 1113 of the other reducer 100.

[0097] In the embodiment of the present application, for the convenience of description, one reducer 100 is referred to as reducer 100a, and the other reducer 100 is referred to as reducer 100c. One first oil guide groove 1113 and another first oil guide groove 1113 of the reducer 100a are referred to as first oil guide groove 1113a and first oil guide groove 1113b, respectively, and one first oil guide groove 1113 and another first oil guide groove 1113 of the reducer 100c are referred to as first oil guide groove 1113c and first oil guide groove 1113d. The output wheel 110 of the reducer 100a is referred to as 110a, and the output wheel 110 of the reducer 100c is referred to as 110c. The output shaft 111 of the output wheel 110a is referred to as output shaft 111a, and the output shaft 111 of the output wheel 110c is referred to as output shaft 111c.

[0098] In the embodiment of the present application, the power assembly 10 includes the reducer 100a and the reducer 100c, the output shaft 111a is integrally formed on the output wheel 110a, and the output shaft 111c is integrally formed on the output wheel 110c. One drive half shaft 500 can be fixed by using the inner surface of the output shaft 111 of each reducer 100, so as to drive the wheels on both sides to rotate.

[0099] wherein it is assumed that the reducer 100a only includes one of the first oil guide groove 1113a and the first oil guide groove 1113b, and the reducer 100c only includes one of the first oil guide groove 1113c and the first oil guide groove 1113d. For example, Figure 11As shown in the structure, since the first oil guide groove 1113a and the first oil guide groove 1113b are both spirally extended from left to right, and the first oil guide groove 1113c and the first oil guide groove 1113d are both spirally extended from right to left, in order to make the speed reducer 100a and the speed reducer 100c simultaneously meet the oil guide lubrication requirement of the forward rotation of the speed reducer 100, the spiral direction of the first oil guide groove 1113 of the speed reducer 100a needs to be opposite to the spiral direction of the first oil guide groove 1113 of the speed reducer 100c. That is, the speed reducer 100a only contains the first oil guide groove 1113a, and the speed reducer 100c only contains the first oil guide groove 1113d, or the speed reducer 100a only contains the first oil guide groove 1113b, and the speed reducer 100c only contains the first oil guide groove 1113c. In this case, the output shaft 111a of the speed reducer 100a and the output shaft 111c of the speed reducer 100c are actually different structures, and the first oil guide groove 1113 of the speed reducer 100a and the first oil guide groove 1113 of the speed reducer 100c need to be machined respectively, which is not conducive to improving the machining difficulty.

[0100] In the embodiment of the application, since the speed reducer 100a and the speed reducer 100c both contain two first oil guide grooves 1113 with opposite spiral directions, the oil guide requirements of forward and reverse rotation are taken into account, so that the machining of the first oil guide groove 1113 of the speed reducer 100a and the first oil guide groove 1113 of the speed reducer 100c can share the same blank, and it is not necessary to consider the problem that the spiral directions of the first oil guide groove 1113 of the speed reducer 100a and the first oil guide groove 1113 of the speed reducer 100c are opposite, which can reduce the machining difficulty and cost while improving the lubrication efficiency of the spline 1111.

[0101] In the embodiment of the application, the speed reducer 100a and the speed reducer 100c belong to the same power assembly 10, the power assembly 10 drives one wheel through the speed reducer 100a and the speed reducer 100c respectively, and the housing of the power assembly 10 includes two speed reducer cavities for accommodating the speed reducer 100a and the speed reducer 100c respectively. It can be understood that the embodiment of the application is also applicable to the scenario that the speed reducer 100a and the speed reducer 100c belong to two power assemblies 10 respectively, and the two power assemblies 10 are used to drive one wheel respectively, and the machining of the first oil guide groove 1113 of the output shaft 111 in the speed reducer 100 of the two power assemblies 10 can also share the same blank.

[0102] Please refer to Figure 4 , Figure 8 and Figure 12 , Figure 12 for the partial schematic view of the power assembly 10 provided in the embodiment of the application. It should be noted that Figure 12 the drive half shaft 500 is only used to show the cooperation relationship between the drive half shaft 500 and the output shaft 111, and does not represent the specific structure and size.

[0103] In an embodiment, the bottom of the output bearing groove 410 comprises a shaft hole 412 through which the end face of one end of the output shaft 111 is connected to the blocking member 180 along the axial direction O of the output gear 110. The end face of one end of the output shaft 111 comprises a gap 1114 which is spaced apart from the blocking member 180 along the axial direction O of the output gear 110. The gap 1114 is used to guide the oil from the oil passage hole 411 to the first oil guide groove 1113.

[0104] In an embodiment of the present application, the drive half shaft 500 extends into the output shaft 111 through the shaft hole 412 in the bottom of the output bearing groove 410. In order to avoid the oil flowing from the oil passage hole 411 into the output bearing groove 410 from leaking at the shaft hole 412, the end face of one end of the output shaft 111 is connected to the blocking member 180 through the shaft hole 412. Since the oil needs to flow from one end of the output shaft 111 into the first oil guide groove 1113, in an embodiment of the present application, the end face of one end of the output shaft 111 comprises a gap 1114 which is spaced apart from the blocking member 180, and the part of the end face of one end of the output shaft 111 other than the gap 1114 is connected to the blocking member 180, so that the oil passage hole 411 and the first oil guide groove 1113 are connected while avoiding oil leakage.

[0105] Please refer to Figures 4 to 6 and Figure 8 In an embodiment, the entrances of the first oil guide grooves 1113 are distributed on the inner surface of the gap 1114, and the distance between the gap 1114 and the oil passage hole 411 along the radial direction R of the output gear 110 is less than the inner diameter of the output bearing groove 410.

[0106] In an embodiment of the present application, the entrances of the first oil guide grooves 1113 are distributed on the inner surface of the gap 1114, so that the oil flows more smoothly between the gap 1114 and the first oil guide groove 1113. The close distance between the gap 1114 and the oil passage hole 411 is conducive to shortening the transmission path of the oil and reducing the power loss of the oil.

[0107] In an embodiment, the end face of one end of the output shaft 111 comprises a plurality of gaps 1114, and the number of the gaps 1114 is equal to the number of the first oil guide grooves 1113, and each gap 1114 is used to connect one first oil guide groove 1113. In an embodiment of the present application, the plurality of gaps 1114 can reduce the difficulty of the oil flowing from the oil passage hole 411 into the output shaft 111 and improve the efficiency of the gap 1114 in collecting oil. Each first oil guide groove 1113 is connected to one gap 1114, which is conducive to optimizing the oil distribution of different first oil guide grooves 1113 in the same reducer 100 and improving the uniformity of lubrication.

[0108] Please refer to Figure 8 andFigure 9 In an embodiment, the plurality of oil guide grooves 1112 includes a second oil guide groove 1115, the second oil guide groove 1115 is distributed between the first oil guide groove 1113 and the spline 1111 along the axial direction O of the output shaft 110, the inner diameter of the output shaft 111 at the second oil guide groove 1115 is greater than the inner diameter of the output shaft 111 at the spline 1111. The outlet of the first oil guide groove 1113 is distributed at the groove bottom of the second oil guide groove 1115, and the second oil guide groove 1115 extends along the circumferential direction of the output shaft 111.

[0109] In the embodiment of the present application, the drive half shaft 500 is installed to the spline 1111 of the output shaft 111 through the first oil guide groove 1113 and the second oil guide groove 1115 in sequence. The inner diameter of the output shaft 111 at the second oil guide groove 1115 is greater than the inner diameter of the output shaft 111 at the spline 1111, and the second oil guide groove 1115 itself functions to avoid collision and wear between the drive half shaft 500 and the output shaft 111 during installation. The embodiment of the present application can realize the reuse of the second oil guide groove 1115: the outlet of the first oil guide groove 1113 is distributed at the groove bottom of the second oil guide groove 1115, the second oil guide groove 1115 is in communication with the first oil guide groove 1113, and the oil liquid moves along the circumferential direction of the output shaft 111 under the guidance of the second oil guide groove 1115, which is conducive to increasing the contact area of the oil liquid with the spline 1111 and improving the uniformity of lubricating the spline 1111.

[0110] Please continue to refer to Figure 3 and Figure 5 In an embodiment, the output wheel 110 includes a reinforcing rib 112, the reinforcing rib 112 is connected to the outer surface of the output shaft 111 along the radial direction R of the output wheel 110, and the thickness of the reinforcing rib 112 along the axial direction O of the output wheel 110 increases from the outer ring of the output wheel 110 towards the output shaft 111.

[0111] In the embodiment of the present application, the output shaft 111 is integrally formed with the output wheel 110. The axial thickness of one end of the reinforcing rib 112 close to the output shaft 111 is greater than the axial thickness of the other end of the reinforcing rib 112 away from the output shaft 111, the reinforcing rib 112 enhances the rigidity of the output wheel 110 and the output shaft 111, improves the modal frequency, and reduces the negative impact of vibration on the oil liquid transportation in the output shaft 111. The damping performance of the output wheel 110 and the output shaft 111 is enhanced, which helps to improve the NVH performance of the electric vehicle.

[0112] In an embodiment, both surfaces of the output wheel 110 along the axial direction O include a plurality of reinforcing ribs 112, and the plurality of reinforcing ribs 112 surround the output shaft 111.

[0113] Please continue to refer to Figure 3 and Figure 5In an embodiment, the output wheel 110 further comprises a plurality of through holes 113, each of which is distributed between every two adjacent reinforcing ribs 112 along the circumference C of the output wheel 110 and is spaced from the output shaft 111. In the embodiment of the present application, the through holes 113 can reduce the overall weight of the output wheel 110, cooperate with the reinforcing ribs 112, and help achieve a balance between the weight and the damping performance of the output wheel 110. The through holes 113 can also avoid the accumulation of debris during processing, and the debris can be discharged in time by using the through holes 113, which is conducive to accelerating the processing rhythm and thus improving the processability of the output wheel 110.

[0114] The power assembly and the electric vehicle provided by the embodiments of the present application are described in detail above, and specific examples are applied in the description of the principles and embodiments of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific embodiments and application ranges can be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A powertrain, characterized by, The housing of the power assembly comprises a reducer cavity for accommodating an output wheel of a reducer in the power assembly, an outer ring of the output wheel is used for drivingly connecting an intermediate driving wheel of the reducer, the output wheel comprises an output shaft, the output shaft protrudes from an inner ring of the output wheel along an axial direction of the output wheel, an inner surface of the output shaft is used for fixing a drive half shaft of the power assembly, a cavity wall of the reducer cavity comprises an output bearing groove for accommodating one end of the output shaft and an output bearing of the reducer, the one end of the output shaft is used for receiving oil delivered by the output bearing groove.

2. The powertrain of claim 1, wherein, A through oil hole is formed in a groove wall of the output bearing groove, an opening of the through oil hole is directed towards a groove bottom of the output bearing groove, the one end of the output shaft is adjacent to the groove bottom of the output bearing groove along the axial direction of the output wheel, and the through oil hole is used for guiding oil to the one end of the output shaft and the output bearing.

3. The powertrain of claim 2, wherein, The opening of the through oil hole intersects a radial direction of the output wheel, and the opening of the through oil hole is directed from the output wheel towards the groove bottom of the output bearing groove.

4. The powertrain of claim 3, wherein, The groove wall of the output bearing groove protrudes towards the output wheel along the axial direction of the output wheel, and a guide rib of the cavity wall of the reducer cavity is connected to the groove wall of the output bearing groove to form a collecting groove, and the opening of the through oil hole is directed from a groove opening of the collecting groove towards the groove bottom of the output bearing groove.

5. The powertrain of claim 2, wherein, The output shaft is used for drivingly connecting an intermediate shaft of the reducer, the intermediate shaft is used for fixing the intermediate driving wheel and an intermediate driven wheel of the reducer, and the through oil holes are distributed between the output shaft and the intermediate shaft.

6. The powertrain of any one of claims 2-5, wherein, Spline teeth are formed on the inner surface of the output shaft for fixing the drive half shaft, the spline teeth are spaced apart from the one end of the output shaft along the axial direction of the output wheel, and the inner surface of the output shaft comprises a plurality of oil guiding grooves distributed between the one end of the output shaft and the spline teeth.

7. The powertrain of claim 6, wherein, The plurality of oil guiding grooves comprises a first oil guiding groove, the first oil guiding groove is recessed away from an axis of the output wheel along the radial direction of the output wheel, and the first oil guiding groove spirally extends from the one end of the output shaft towards the spline teeth along the axial direction of the output wheel.

8. The powertrain of claim 7, wherein, The inner surface of the output shaft comprises a plurality of the first oil guiding grooves, and outlets of the plurality of first oil guiding grooves are spaced apart along a circumferential direction of the output wheel.

9. The powertrain of claim 7, wherein, The inner surface of the output shaft comprises two first oil guiding grooves, and spiral directions of the two first oil guiding grooves are opposite.

10. The powertrain of claim 9, wherein, The power assembly comprises two reducers, the two reducers are arranged along the axial direction of the output wheel, a spiral direction of one first oil guiding groove of one reducer is the same as a spiral direction of one first oil guiding groove of another reducer, and a spiral direction of another first oil guiding groove of one reducer is the same as a spiral direction of another first oil guiding groove of another reducer.

11. The powertrain of any of claims 7-10, wherein, The bottom of the output bearing groove comprises a shaft hole, a blocking piece of the reducer along the axial direction of the output wheel is used to connect the end surface of the one end of the output shaft through the shaft hole, the end surface of the one end of the output shaft comprises a notch, the notch is spaced from the blocking piece along the axial direction of the output wheel, and the notch is used to guide the oil from the oil hole to the first oil guide groove.

12. The powertrain of claim 11, wherein, The inlet of the first oil guide groove is distributed on the inner surface of the notch, the distance between the notch and the oil hole along the radial direction of the output wheel is less than the inner diameter of the output bearing groove.

13. The powertrain of any of claims 7-10, wherein, The plurality of oil guide grooves comprises a second oil guide groove, the second oil guide groove is distributed between the first oil guide groove and the spline along the axial direction of the output wheel, the inner diameter of the output shaft at the second oil guide groove is greater than the inner diameter of the output shaft at the spline, the outlet of the first oil guide groove is distributed on the bottom of the second oil guide groove, and the second oil guide groove extends along the circumferential direction of the output shaft.

14. The powertrain of any of claims 1-5, 7-10, 12, wherein, The output wheel comprises a reinforcing rib, the reinforcing rib is connected to the outer surface of the output shaft along the radial direction of the output wheel, and the thickness of the reinforcing rib along the axial direction of the output wheel increases from the outer ring of the output wheel towards the output shaft.

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

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