Vehicle and electric drive assembly

Abstract

Disclosed in the present invention are a vehicle and an electric drive assembly. The electric drive assembly comprises a housing, an electric motor shaft, an adapter shaft, and a sealing ring. The housing is provided with a housing oil hole; the electric motor shaft is rotatably arranged in the housing and is provided with an electric motor shaft hole extending in the axial direction thereof; the adapter shaft passes through the electric motor shaft hole, and an annular cavity is enclosed between the electric motor shaft hole and the adapter shaft; and the sealing ring is arranged in the housing and is in sealing fit with the housing, the sealing ring is sleeved on the adapter shaft and is arranged on one axial side of the electric motor shaft, the sealing ring is provided with an oil intake hole extending in the axial direction of the electric motor shaft, and the oil intake hole is in communication with the housing oil hole and the annular cavity. The electric drive assembly of the present invention can reduce the requirements for the assembly precision of the electric drive assembly and reduce the costs of the electric drive assembly.

Description

Vehicle and electric drive assembly

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese patent applications filed on May 29, 2024, with application number 202410683906.1 entitled "Vehicle and Electric Drive Assembly" and application number 202410686751.7 filed on May 29, 2024, entitled "Electric Drive Assembly and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of vehicle technology, and more specifically to a vehicle and an electric drive assembly. Background Technology

[0004] Currently, electric drive assemblies commonly use oil cooling. For example, the motor shaft is made hollow, and oil pipes are installed inside the shaft to supply cooling oil and dissipate heat from the rotor. However, for coaxial electric drive assemblies, a connecting shaft passes through the motor shaft, preventing cooling oil from entering the shaft itself. Related technologies use a method of spraying cooling oil onto the end face of the motor shaft to cool the rotor. This method, however, cannot adequately cool the internal components of the motor (such as the rotor core and magnets), leading to excessively high operating temperatures and poor reliability of the electric drive assembly.

[0005] Some electric drive assemblies have an oil inlet section on the housing, forming an annular gap between the oil inlet section and the adapter shaft. This annular gap communicates with the housing oil hole on the housing, and the annular cavity formed between the motor shaft and the adapter shaft communicates with the annular gap. Cooling oil is supplied to the annular cavity through the annular gap to cool the motor's internal components. Because the annular gap is formed by a part of the housing and the adapter shaft, the radial relative position of the housing and the adapter shaft must be strictly maintained during the assembly of the electric drive assembly to ensure the size of the annular gap. This results in high assembly precision requirements and a higher cost for the electric drive assembly. Summary of the Invention

[0006] This invention proposes an electric drive assembly to reduce the assembly precision requirements and lower the cost of the electric drive assembly.

[0007] The electric drive assembly of the present invention includes a housing, a motor shaft, a transition shaft, and a sealing ring. The housing has a housing oil hole. The motor shaft is rotatably disposed within the housing and has a motor shaft hole extending axially therefrom. The transition shaft passes through the motor shaft hole, and the motor shaft hole and the transition shaft form an annular cavity. The sealing ring is disposed within the housing and seals against the housing. The sealing ring is sleeved on the outside of the transition shaft and located on one axial side of the motor shaft. The sealing ring has an oil inlet hole extending axially along the motor shaft, and the oil inlet hole communicates with the housing oil hole and the annular cavity.

[0008] Optionally, the end of the oil inlet facing away from the motor shaft is connected to the oil hole in the housing, and the end of the oil inlet facing the motor shaft is connected to the annular cavity.

[0009] Optionally, the adapter shaft is provided with an adapter shaft hole extending axially along the motor shaft, and the adapter shaft hole communicates with the annular cavity;

[0010] The oil inlet hole connects the housing oil hole and the adapter shaft hole.

[0011] Optionally, the oil inlet hole is gradually inclined toward the inside of the motor shaft in a direction close to the motor shaft.

[0012] Optionally, the port of the annular cavity facing the sealing ring forms an oil cavity inlet, and the orthographic projection of the oil inlet hole in its extension direction covers a portion of the oil cavity inlet.

[0013] Optionally, the annular cavity includes a first segment and a second segment, the first segment being disposed axially between the second segment and the sealing ring on the motor shaft, the radial dimension of the first segment being smaller than the radial dimension of the second segment; and / or, the motor shaft hole includes an oil inlet segment, the oil inlet segment being disposed axially closer to the sealing ring relative to the rest of the motor shaft hole on the motor shaft, the oil inlet segment having a spiral groove extending axially along the motor shaft.

[0014] Optionally, the adapter shaft is provided with a first connecting hole and a second connecting hole extending radially along the motor shaft. The first connecting hole and the second connecting hole are spaced apart along the axial direction of the motor shaft. The first connecting hole connects the oil inlet hole and the adapter shaft hole, and the second connecting hole connects the adapter shaft hole and the annular cavity.

[0015] Optionally, the sealing ring is provided with a first oil groove, which is located inside the oil inlet and surrounds the adapter shaft. The inner end of the oil inlet penetrates the bottom wall of the first oil groove, and the opening of the first oil groove is located on the inner circumferential surface of the sealing ring and communicates with the first connecting hole.

[0016] Optionally, the number of oil inlets is multiple, and the multiple oil inlets are arranged at circumferential intervals along the motor shaft, and all of the multiple oil inlets are in communication with the first oil groove; and / or

[0017] There are multiple first connecting holes, which are arranged at intervals along the circumference of the motor shaft, and all of the multiple first connecting holes are connected to the first oil groove.

[0018] Optionally, the sealing ring is provided with a second oil groove, which is located outside the oil inlet and surrounds the adapter shaft. The outer end of the oil inlet penetrates the bottom wall of the second oil groove, and the opening of the second oil groove is located on the outer circumferential surface of the sealing ring and communicates with the oil hole of the housing.

[0019] Optionally, there are multiple oil inlet holes, which are arranged at circumferential intervals along the motor shaft, and all of the oil inlet holes are connected to the second oil groove.

[0020] Optionally, the housing has an annular sealing surface, one end of the housing oil hole penetrates the sealing surface, and the sealing ring is in sealing engagement with the sealing surface.

[0021] Optionally, the sealing ring is located on the inner side of the sealing surface, and the outer peripheral surface of the sealing ring is in sealing fit with the sealing surface; the sealing ring also includes an oil inlet groove, the groove opening of the oil inlet groove is located on the outer peripheral surface of the sealing ring and communicates with the oil hole of the housing, the oil inlet hole is located axially on the motor shaft between the oil inlet groove and the motor shaft, and the end of the oil inlet hole facing away from the motor shaft penetrates through the groove sidewall of the oil inlet groove.

[0022] Optionally, the sealing ring is clearance-fitted with the adapter shaft.

[0023] Optionally, the electric drive assembly further includes an annular seal disposed between the adapter shaft and the sealing ring, wherein the outer peripheral surface of the seal is interference-fitted with the inner peripheral surface of the sealing ring, and the inner peripheral surface of the seal is clearance-fitted with the adapter shaft.

[0024] Optionally, the electric drive assembly further includes a rotor core, which is disposed within the housing and sleeved on the outside of the motor shaft. The rotor core has a rotor oil passage and a connecting hole. The rotor oil passage extends axially along the motor shaft, and the connecting hole extends radially along the motor shaft. The inner end of the connecting hole penetrates the wall of the motor shaft hole, and the outer end of the connecting hole communicates with the rotor oil passage.

[0025] The present invention also proposes a vehicle.

[0026] The vehicle of the present invention includes the electric drive assembly described in any of the preceding claims.

[0027] The electric drive assembly of this invention forms an annular cavity between the motor shaft hole and the adapter shaft. An oil hole is provided in the housing, and an oil inlet hole communicating with both the housing oil hole and the annular cavity is provided in the sealing ring. This allows cooling oil to enter the oil inlet hole through the housing oil hole and then into the annular cavity. The cooling oil in the annular cavity cools and dissipates heat from the inside of the motor shaft, thereby reducing the operating temperature of the electric drive assembly and improving its reliability. By sealing the sealing ring with the housing, cooling oil leakage is prevented from occurring through gaps between the sealing ring and the housing. Furthermore, by placing the oil inlet hole communicating with the housing oil hole and the annular cavity on the sealing ring, during assembly of the electric drive assembly, only the sealing ring and housing need to be sealed, and the housing oil hole and annular cavity need to communicate with the oil inlet hole. The radial relative position requirements between any two of the housing, motor shaft, adapter shaft, and sealing ring are lower, thus reducing the assembly precision requirements and cost of the electric drive assembly. Attached Figure Description

[0028] Figure 1 is a partial structural schematic diagram of an electric drive assembly according to an embodiment of the present invention.

[0029] Figure 2 is a schematic diagram of another partial structure of the electric drive assembly according to an embodiment of the present invention.

[0030] Figure 3 is a diagram of the cooling system of an electric drive assembly according to an embodiment of the present invention. Specific Implementation

[0031] Embodiments of the present invention are described in detail below, with examples of the embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] In one embodiment of this application, as shown in FIG1, the electric drive assembly of this embodiment includes a housing 1, a motor shaft 2, a transition shaft 3, and a sealing ring 4. The housing 1 has a housing oil hole. The motor shaft 2 is rotatably disposed within the housing 1. The sealing ring 4 is disposed within the housing 1 and seals against the housing 1. The sealing ring 4 is sleeved on the outside of the transition shaft 3 and is located on one axial side of the motor shaft 2. The motor shaft 2 has a motor shaft hole extending along its axial direction. The motor shaft hole and the transition shaft 3 form an annular cavity 21. The sealing ring 4 has an oil inlet hole 41 extending along the axial direction of the motor shaft 2. The end of the oil inlet hole 41 facing away from the motor shaft 2 communicates with the housing oil hole, and the end of the oil inlet hole 41 facing the motor shaft 2 communicates with the annular cavity 21. The internal and external directions are shown in FIG1.

[0033] The electric drive assembly of this invention forms an annular cavity 21 between the motor shaft hole and the adapter shaft 3. An oil hole is provided in the housing 1, and an oil inlet 41 communicating with both the housing oil hole and the annular cavity 21 is provided in the sealing ring 4. This allows cooling oil to enter the oil inlet 41 through the housing oil hole and then into the annular cavity 21. The cooling oil in the annular cavity 21 cools and dissipates heat from the inside of the motor shaft 2, thereby reducing the operating temperature of the electric drive assembly and improving its reliability. By sealing the sealing ring 4 with the housing, cooling oil leakage is prevented from flowing out through the gap between the sealing ring 4 and the housing. By setting the oil inlet 41, which communicates with the housing oil hole and the annular cavity 21, on the sealing ring 4, during the assembly of the electric drive assembly, it is only necessary to ensure that the sealing ring 4 seals with the housing and that the housing oil hole and the annular cavity 21 communicate with the oil inlet 41. The radial relative position requirements between any two of the housing 1, motor shaft 2, adapter shaft 3, and sealing ring 4 are lower, thereby reducing the assembly precision requirements and cost of the electric drive assembly. The cooling oil can be lubricating oil.

[0034] To make the technical solution of the present invention easier to understand, the following description takes the axial direction of the motor shaft 2 being consistent with the left-right direction as an example. The left-right direction is shown in Figure 1.

[0035] For example, as shown in Figure 1, the motor shaft 2, the adapter shaft 3, the motor shaft hole, and the annular cavity 21 all extend in the left-right direction. The sealing ring 4 is located on the left side of the motor shaft 2, and the oil inlet 41 extends in the left-right direction. The left end of the oil inlet 41 communicates with the oil hole in the housing, and the right end of the oil inlet 41 communicates with the left end of the annular cavity 21.

[0036] Optionally, as shown in Figure 1, the oil inlet hole 41 gradually tilts towards the inside of the motor shaft 2 along the direction close to the motor shaft 2.

[0037] For example, as shown in Figure 1, the oil inlet hole 41 is arranged to gradually tilt inward from left to right, so that the left end of the oil inlet hole 41 is located outside the right end.

[0038] The tilt angle of the oil inlet 41 can be designed as needed, so that the end of the oil inlet 41 facing the motor shaft 2 is set towards the annular cavity 21.

[0039] By arranging the oil inlet hole 41 in a gradually inwardly inclined manner along the direction close to the motor shaft 2, so that the end of the oil inlet hole 41 facing the motor shaft 2 is set inward and the end of the oil inlet hole 41 facing away from the motor shaft 2 is set outward, the structural strength of the sealing ring 4 can be improved, and the reliability of the electric drive assembly can be further improved.

[0040] Optionally, as shown in Figure 1, the port of the annular cavity 21 facing the sealing ring 4 forms an oil cavity inlet, and the orthographic projection of the oil inlet hole 41 in its extending direction covers a portion of the oil cavity inlet. In other words, a portion of the oil cavity inlet is arranged in the extending direction of the oil inlet hole 41.

[0041] For example, as shown in Figure 1, the right port of the annular cavity 21 forms an oil cavity inlet.

[0042] By covering a portion of the oil cavity inlet with the orthographic projection of the oil inlet hole 41 in its extending direction, the cooling oil flowing out of the oil inlet hole 41 directly enters the annular cavity 21 through the oil cavity inlet under inertial action, reducing the leakage of cooling oil during the process of entering the annular cavity 21 from the oil inlet hole 41, and further improving the reliability of the electric drive assembly.

[0043] In some embodiments, as shown in FIG1, the annular cavity 21 includes a first segment 211 and a second segment 212. The first segment 211 is disposed axially between the second segment 212 and the sealing ring 4 on the motor shaft 2. The radial dimension of the first segment 211 is smaller than the radial dimension of the second segment 212. That is, the first segment 211 is disposed closer to the oil inlet 41 on the motor shaft 2 relative to the second segment 212.

[0044] For example, as shown in Figure 1, the oil inlet 41 is located on the left side of the first section 211, and the first section 211 is located on the left side of the second section 212. Thus, the cooling oil flowing out of the oil inlet 41 first flows into the first section 211 of the annular cavity 21, and then flows into the second section 212 of the annular cavity 21 through the first section 211.

[0045] Understandably, in order to ensure the cooling effect inside the motor shaft 2, it is necessary to ensure that there is cooling oil in all parts of the annular cavity 21. In addition, the cooling oil near the oil inlet 41 in the annular cavity 21 needs to have a large flow rate to ensure that the cooling oil can flow to the part of the annular cavity 21 away from the oil inlet 41, thereby ensuring that there is cooling oil in all parts of the annular cavity 21.

[0046] By setting the radial dimension of the first section 211 near the oil inlet 41 to be smaller than the radial dimension of the second section 212 away from the oil inlet 41, the flow rate of the cooling oil in the first section 211 is larger, so as to ensure that the cooling oil can flow into the second section 212, thereby ensuring that there is cooling oil in all parts of the annular cavity 21, improving the cooling and heat dissipation effect on the motor shaft 2, and further improving the reliability of the electric drive assembly.

[0047] Optionally, as shown in Figure 1, the motor shaft hole includes an oil inlet section 213, which is located closer to the sealing ring 4 in the axial direction of the motor shaft 2 relative to the rest of the motor shaft hole. The oil inlet section 213 is provided with a spiral groove extending along the axial direction of the motor shaft 2.

[0048] For example, as shown in Figure 1, the oil inlet section 213 is located to the left of the first section 211, and the first section 211 is located to the left of the second section 212. Thus, the cooling oil flowing out of the oil inlet hole 41 first enters the oil inlet section 213, then flows through the oil inlet section 213 into the first section 211 of the annular cavity 21, and then flows through the first section 211 of the annular cavity 21 into the second section 212 of the annular cavity 21.

[0049] By providing a spiral groove extending axially along the motor shaft 2 in the oil inlet section 213, the cooling oil in the oil inlet section 213 is introduced into the interior of the annular cavity 21 through the spiral groove, thereby reducing the drag loss on the rotation of the adapter shaft 3 and improving the efficiency of the electric drive assembly.

[0050] In some embodiments, as shown in FIG1, the housing 1 has an annular sealing surface 11, one end of the housing oil hole penetrates the sealing surface 11, and the sealing ring 4 is sealed to the sealing surface 11.

[0051] By sealing the sealing ring 4 with the sealing surface 11 and extending one end of the housing oil hole through the sealing surface 11, the sealing ring 4 and the sealing surface 11 can also seal the connection between the housing oil hole and the oil inlet 41, preventing leakage of cooling oil as it enters the oil inlet 41 from the housing oil hole. Thus, both the sealing ring 4 and the housing 1, and the connection between the housing oil hole and the oil inlet 41 can be sealed simultaneously, simplifying the structure of the electric drive assembly and reducing its cost.

[0052] Optionally, the outer circumferential surface of the sealing ring 4 is interference-fitted with the sealing surface 11.

[0053] By interfering with the outer circumferential surface of the sealing ring 4 and the sealing surface 11, a sealing fit between the outer circumferential surface of the sealing ring 4 and the sealing surface 11 can be achieved without adding any other components. This further simplifies the structure of the electric drive assembly and reduces its cost.

[0054] Optionally, as shown in Figure 1, the sealing ring 4 is located inside the sealing surface 11, and the outer circumferential surface of the sealing ring 4 is in sealing fit with the sealing surface 11. The sealing ring 4 also includes an oil inlet groove 42, the groove opening of which is located on the outer circumferential surface of the sealing ring 4 and communicates with the oil hole of the housing. An oil inlet hole 41 is located axially between the oil inlet groove 42 and the motor shaft 2, and the end of the oil inlet hole 41 facing away from the motor shaft 2 penetrates the sidewall of the oil inlet groove 42.

[0055] The oil inlet hole 41 is connected to the oil inlet groove 42 by passing the end of the oil inlet hole 41 facing away from the motor shaft 2 through the groove side wall of the oil inlet groove 42.

[0056] Understandably, to ensure a high flow velocity of the cooling oil in the oil inlet 41 within the annular cavity 21, the cross-sectional dimensions of the oil inlet 41 typically need to be relatively small. Furthermore, to ensure the structural strength of the housing 1, the cross-sectional dimensions of the housing oil holes are also typically small. This makes it difficult for the oil inlet 41 to directly connect with the housing oil holes. However, the cross-sectional dimensions of the oil inlet groove 42 on the sealing ring 4 are not subject to these limitations and can be set larger to facilitate communication between the housing oil holes and the oil inlet groove 42. During the assembly of the electric drive assembly, it is only necessary to ensure that the oil inlet groove 42 connects with the housing oil holes and that the oil inlet 41 connects with the annular cavity 21, further reducing the assembly precision requirements and cost of the electric drive assembly.

[0057] The cross-sectional dimensions of the oil inlet hole 41 can be understood as the cross-sectional dimensions of the oil inlet hole 41 cut by a section perpendicular to its extension direction; the cross-sectional dimensions of the housing oil hole can be understood as the cross-sectional dimensions of the housing oil hole cut by a section perpendicular to its extension direction; and the cross-sectional dimensions of the oil inlet groove 42 can be understood as the cross-sectional dimensions of the oil inlet groove 42 cut by a section perpendicular to the extension direction of the housing oil hole.

[0058] Optionally, there are multiple oil inlet holes 41, which are arranged at intervals along the circumference of the motor shaft 2, and the oil inlet groove 42 is an annular groove.

[0059] For example, multiple oil inlet holes 41 are evenly spaced along the circumferential direction of the motor shaft 2.

[0060] By setting multiple oil inlets 41 and arranging them at intervals along the circumference of the motor shaft 2, the cooling oil from the oil inlet groove 42 can simultaneously enter the annular cavity 21 through the multiple oil inlets 41, thereby increasing the flow rate of the cooling oil in the annular cavity 21 and improving the cooling and heat dissipation effect of the electric drive assembly.

[0061] Optionally, the sealing ring 4 and the adapter shaft 3 are clearance-fitted.

[0062] It is understandable that the adapter shaft 3 is connected to the reducer. After the reducer decelerates the speed, the speed of the adapter shaft 3 is relatively low. By fitting the sealing ring 4 with the adapter shaft 3 with a clearance, the requirement for micro-leakage of cooling oil can be met, and the drag loss of the sealing ring 4 on the rotation of the adapter shaft 3 can be reduced, thereby improving the efficiency of the electric drive assembly.

[0063] Optionally, as shown in Figure 1, the electric drive assembly further includes an annular seal 8, which is disposed between the sealing ring 4 and the adapter shaft 3. The outer circumferential surface of the seal 8 is interference-fitted with the inner circumferential surface of the sealing ring 4, and the inner circumferential surface of the seal 8 is clearance-fitted with the adapter shaft 3.

[0064] It is understandable that the adapter shaft 3 is connected to the reducer. After the reducer speeds up, the speed of the adapter shaft 3 is relatively low. By fitting the seal 8 with the adapter shaft 3 with a clearance, the requirement for micro-leakage of cooling oil can be met, and the drag loss of the seal 8 on the rotation of the adapter shaft 3 can be reduced, thereby improving the efficiency of the electric drive assembly.

[0065] Optionally, seal 8 is a plastic ring.

[0066] For example, seal 8 is made of PTFE (polytetrafluoroethylene).

[0067] By making the seal 8 a plastic ring, the seal 8 can deform and press against the sealing ring 4 under the pressure of cooling oil, thereby increasing the sealing performance between the seal 8 and the sealing ring 4.

[0068] Optionally, as shown in Figure 1, there are multiple seals 8, which are arranged at intervals along the axial direction of the motor shaft 2.

[0069] For example, as shown in Figure 1, there are two seals 8, and both seals 8 are sealed together with the sealing ring 4 to improve the sealing performance between the seals 8 and the sealing ring 4.

[0070] Optionally, the adapter shaft 3 is provided with an annular mounting groove, which is arranged around the circumference of the motor shaft 2, and the seal 8 is disposed in the mounting groove.

[0071] By setting an installation groove on the adapter shaft 3, when installing the seal 8, the seal 8 can be first placed in the installation groove, and the axial positioning of the seal 8 can be achieved by using the installation groove. Then, the sealing ring 4 is placed on the outside of the adapter shaft 3, which facilitates the installation and fixing of the seal 8.

[0072] In some embodiments, as shown in FIG1, the electric drive assembly further includes a rotor core 5, which is disposed within the housing 1 and sleeved on the motor shaft 2. The rotor core 5 is provided with a rotor oil passage 51 and a connecting hole 52. The rotor oil passage 51 extends axially along the motor shaft 2, and the connecting hole 52 extends radially along the motor shaft 2. The inner end of the connecting hole 52 penetrates the wall of the motor shaft hole, and the outer end of the connecting hole 52 communicates with the rotor oil passage 51.

[0073] Therefore, the cooling oil in the annular cavity 21 can enter the rotor oil passage 51 through the connecting hole 52 to cool and dissipate heat from the rotor core 5, thereby reducing the temperature of the rotor core 5 during the operation of the electric drive assembly and further improving the reliability of the electric drive assembly.

[0074] Optionally, as shown in Figure 1, the electric drive assembly further includes a cover plate 6 and a stator winding 7. The cover plate 6 is located at both axial ends of the rotor core 5. The cover plate 6 has oil injection holes that communicate with the rotor oil passage 51 and are gradually inclined outwards in a direction away from the rotor core 5, so that the cooling oil in the oil injection holes can be sprayed onto the winding ends of the stator winding 7. The cover plate 6 is connected to the rotor core 5, and the rotor oil passage 51 passes through both ends of the motor shaft 2 along its axial direction.

[0075] Therefore, the cooling oil in the rotor oil passage 51 can enter the oil spray hole of the cover plate 6 and be sprayed to the winding end of the stator winding 7 through the oil spray hole, thereby achieving cooling and heat dissipation of the winding end of the stator winding 7 and further improving the reliability of the electric drive assembly.

[0076] As shown in Figure 3, the electric drive assembly includes an oil tank 10, a coarse filter 20, an oil pump 30, a fine filter 40, a heat exchanger 50, a solenoid valve 60, a reducer gear 70, and a reducer bearing 80. The oil pump 30's suction port is connected to the coarse filter 20, and its outlet port is connected to the fine filter 40. Under the drive of the oil pump 30, the cooling oil at the bottom of the oil tank 10 first enters the coarse filter 20. The cooling oil filtered by the coarse filter 20 then enters the oil pump 30. The cooling oil flowing out of the oil pump 30 flows through the fine filter 40, and the filtered oil enters different oil paths. One path of cooling oil, after heat exchange in the heat exchanger 50, enters the motor's interior to cool it. Specifically, one path of cooling oil enters the annular cavity 21 through the housing oil holes and the oil inlet 41 to cool the rotor; the other path of cooling oil enters the stator core and flows out through the oil spray ring to cool the stator. Another cooling oil enters the reducer and then splits into a gear lubrication circuit and a bearing lubrication circuit, respectively lubricating and cooling the reducer gears 70 and the reducer bearings 80. The oil circuit between the heat exchanger 50 and the oil inlet is equipped with a solenoid valve 60, and the oil circuit between the heat exchanger 50 and the stator, the gear lubrication circuit, and the bearing lubrication circuit are all equipped with throttling orifices 90.

[0077] The electric drive assembly of this invention can lubricate and cool the stator, rotor, and reducer of the motor, keeping both the motor and reducer within an optimal operating temperature range and improving the power of the electric drive assembly. Unlike conventional oil injection pipe designs, the electric drive assembly of this invention uses a sealing ring 4 inside the housing 1. Cooling oil enters directly into the annular cavity 21 formed by the motor shaft 2 and the adapter shaft 3 through the oil inlet 41 of the sealing ring 4, thereby cooling the rotor core 5, magnets, etc. The cooling oil thrown out from the rotor of the motor can further cool the winding ends of the stator.

[0078] In another embodiment of this application, as shown in FIG2, the electric drive assembly of this embodiment includes a housing 1, a motor shaft 2, a transition shaft 3, and a sealing ring 4. The motor shaft 2 is rotatably disposed within the housing 1, and the sealing ring 4 is disposed within the housing 1 and sealably fitted with the housing 1. The sealing ring 4 is sleeved on the outside of the transition shaft 3 and is located on one axial side of the motor shaft 2. The motor shaft 2 has a motor shaft hole extending axially therefrom, and the transition shaft 3 passes through the motor shaft hole and forms an annular cavity 21 with the motor shaft hole. The transition shaft 3 has a transition shaft hole 31 extending axially along the motor shaft 2, and the transition shaft hole 31 communicates with the annular cavity 21. The housing 1 has a housing oil hole, and the sealing ring 4 has an oil inlet hole 41 extending radially along the motor shaft 2, and the oil inlet hole 41 communicates with the housing oil hole and the transition shaft hole 31. The inward and outward directions are shown in FIG2.

[0079] The electric drive assembly of this invention, by providing a housing oil hole in the housing 1, forms an annular cavity 21 between the motor shaft hole and the adapter shaft 3. A first connecting hole 32, connecting the adapter shaft hole 31 to the annular cavity 21, is provided in the adapter shaft 3. An oil inlet hole 41, connecting the housing oil hole and the adapter shaft hole 31, is provided in the sealing ring 4. This allows cooling oil to sequentially enter the annular cavity 21 through the housing oil hole, the oil inlet hole 41, and the adapter shaft hole 31, thereby achieving cooling and heat dissipation of the motor shaft 2. By placing the sealing ring 4 inside the housing 1 and sealing it in a sealed fit, and by placing the oil inlet hole 41 connecting the housing oil hole and the adapter shaft hole 31 on the sealing ring 4, leakage of cooling oil directly between the housing 1 and the adapter shaft 3, and between the housing 1 and the sealing ring 4, can be prevented, reducing the amount of cooling oil leakage inside the electric drive assembly. This improves the cooling effect and reliability of the electric drive assembly. The cooling oil can be lubricating oil.

[0080] To make the technical solution of the present invention easier to understand, the following description takes the axial direction of the motor shaft 2 being consistent with the left-right direction as an example. The left-right direction is shown in Figure 2.

[0081] For example, as shown in Figure 2, the motor shaft 2, the adapter shaft 3, the motor shaft hole, and the adapter shaft hole 31 all extend in the left-right direction. The oil inlet hole 41 extends in the inward-outward direction. The sealing ring 4 is located on the left side of the motor shaft 2.

[0082] When cooling the electric drive assembly, the cooling oil first enters through the housing oil hole, then enters the adapter shaft hole 31 through the oil inlet hole 41 in the direction from the outside to the inside, then flows along the adapter shaft hole 31 in the direction from left to right, and then enters the annular cavity 21.

[0083] Optionally, as shown in Figure 2, the adapter shaft 3 is provided with a first connecting hole 32 and a second connecting hole 33 extending radially along the motor shaft 2. The second connecting hole 33 is located on the side of the first connecting hole 32 facing away from the sealing ring 4 in the axial direction of the motor shaft 2. The first connecting hole 32 connects the oil inlet hole 41 and the adapter shaft hole 31, and the second connecting hole 33 connects the adapter shaft hole 31 and the annular cavity 21.

[0084] For example, as shown in Figure 2, both the first connecting hole 32 and the second connecting hole 33 extend in the inward and outward directions, with the first connecting hole 32 located to the left of the second connecting hole 33. Cooling oil in the housing oil hole first enters the first connecting hole 32 through the oil inlet hole 41 in the inward direction, then enters the adapter shaft hole 31 through the first connecting hole 32 in the inward direction, then flows along the adapter shaft hole 31 in the left-to-right direction, and finally enters the annular cavity 21 through the second connecting hole 33 in the inward-to-outward direction. Specifically, the cooling oil in the housing oil hole enters the adapter shaft hole 31 through the oil inlet hole 41 and the first connecting hole 32 under oil pressure; the cooling oil in the adapter shaft hole 31 enters the annular cavity 21 through the second connecting hole 33 under centrifugal force.

[0085] By providing a first connecting hole 32 and a second connecting hole 33 extending radially along the motor shaft 2 on the adapter shaft 3, the first connecting hole 32 connects the oil inlet hole 41 and the adapter shaft hole 31, and the second connecting hole 33 connects the adapter shaft hole 31 and the annular cavity 21, so that the centerline of the adapter shaft hole 31 can be collinear with the axis of the adapter shaft 3, that is, the adapter shaft hole 31 and the adapter shaft 3 are coaxially arranged. This not only facilitates the machining and manufacturing of the adapter shaft hole 31 and reduces the manufacturing cost of the electric drive assembly, but also avoids the eccentricity problem of the adapter shaft 3 and improves the operational reliability of the electric drive assembly.

[0086] Optionally, there are multiple first connecting holes 32, which are arranged at intervals along the circumference of the motor shaft 2, and all of the multiple first connecting holes 32 are connected to the adapter shaft hole 31.

[0087] By setting the number of first connecting holes 32 to multiple and arranging the multiple first connecting holes 32 at intervals along the circumference of the motor shaft 2, not only can the eccentricity problem of the adapter shaft 3 be avoided and the operational reliability of the electric drive assembly be improved, but also the cooling oil can simultaneously enter the adapter shaft hole 31 through multiple first connecting holes 32 and finally enter the annular cavity 21, thereby increasing the flow rate of cooling oil in the annular cavity 21 and improving the cooling and heat dissipation effect of the electric drive assembly.

[0088] Optionally, there are multiple second connecting holes 33, which are arranged at intervals along the circumference of the motor shaft 2, and all of the multiple second connecting holes 33 are connected to the adapter shaft hole 31 and the annular cavity 21.

[0089] By setting the number of second connecting holes 33 to multiple and arranging the multiple second connecting holes 33 at intervals along the circumference of the motor shaft 2, not only can the eccentricity problem of the adapter shaft 3 be avoided and the operational reliability of the electric drive assembly be improved, but also the cooling oil in the adapter shaft hole 31 can simultaneously enter the annular cavity 21 through multiple second connecting holes 33, thereby increasing the flow rate of the cooling oil in the annular cavity 21 and improving the cooling and heat dissipation effect of the electric drive assembly.

[0090] Optionally, as shown in Figure 2, the sealing ring 4 is provided with a first oil groove 421, which is located inside the oil inlet hole 41 and surrounds the adapter shaft 3. The inner end of the oil inlet hole 41 penetrates the bottom wall of the first oil groove 421, and the opening of the first oil groove 421 is located on the inner circumferential surface of the sealing ring 4 and communicates with the first connecting hole 32.

[0091] The inner end of the oil inlet hole 41 penetrates the bottom wall of the first oil groove 421, thus connecting the inner end of the oil inlet hole 41 with the first oil groove 421. The opening of the first oil groove 421 is located on the inner circumferential surface of the sealing ring 4, thus connecting the opening of the first oil groove 421 with the first connecting hole 32. Therefore, the oil inlet hole 41 is connected to the first connecting hole 32 through the first oil groove 421.

[0092] By providing a first oil groove 421 surrounding the adapter shaft 3 in the sealing ring 4, the oil inlet hole 41 and the first connecting hole 32 are connected via the first oil groove 421. This means that only the relative positions of the oil inlet hole 41, the first connecting hole 32, and the first oil groove 421 in the axial direction of the motor shaft 2 are required to ensure communication between the oil inlet hole 41 and the first connecting hole 32, without needing to consider their relative positions in the circumferential direction of the motor shaft 2. This facilitates the assembly of the motor shaft 2, the adapter shaft 3, and the sealing ring 4, improves the assembly efficiency of the electric drive assembly, and further reduces the cost of the electric drive assembly.

[0093] Optionally, there are multiple oil inlet holes 41, which are arranged at intervals along the circumference of the motor shaft 2, and all of the multiple oil inlet holes 41 are connected to the first oil groove 421.

[0094] For example, there are four oil inlet holes 41, which are arranged at intervals along the circumference of the motor shaft 2.

[0095] By setting the number of oil inlet holes 41 to multiple and arranging the multiple oil inlet holes 41 at intervals along the circumference of the motor shaft 2, the cooling oil in the housing oil hole can enter the multiple oil inlet holes 41 at the same time, thereby increasing the flow rate of cooling oil in the annular cavity 21 and improving the cooling and heat dissipation effect of the electric drive assembly.

[0096] Optionally, there are multiple first connecting holes 32, and the multiple first connecting holes 32 are not evenly spaced along the circumferential direction of the motor shaft 2. All of the multiple first connecting holes 32 are connected to the first oil groove 421.

[0097] For example, there are four first connecting holes 32, and the four first connecting holes 32 are arranged at intervals along the circumference of the motor shaft 2.

[0098] This allows the cooling oil in the first oil tank 421 to simultaneously enter multiple first connecting holes 32, increasing the flow rate of the cooling oil in the annular cavity 21, thereby improving the cooling and heat dissipation effect of the electric drive assembly.

[0099] Optionally, as shown in Figure 2, the sealing ring 4 is provided with a second oil groove 43, which is located outside the oil inlet hole 41 and surrounds the adapter shaft 3. The outer end of the oil inlet hole 41 penetrates the bottom wall of the second oil groove 43, and the opening of the second oil groove 43 is located on the outer peripheral surface of the sealing ring 4 and communicates with the oil hole of the housing.

[0100] The outer end of the oil inlet hole 41 penetrates the bottom wall of the second oil groove 43, thus connecting the outer end of the oil inlet hole 41 with the second oil groove 43. The opening of the second oil groove 43 is located on the inner circumferential surface of the sealing ring 4, thus connecting the opening of the second oil groove 43 with the oil hole in the housing. Therefore, the oil inlet hole 41 is connected to the oil hole in the housing via the second oil groove 43.

[0101] By providing a second oil groove 43 around the adapter shaft 3 in the sealing ring 4, the oil inlet 41 is connected to the housing oil hole. This allows the oil inlet 41 to be connected to the housing oil hole simply by ensuring the relative positions of the oil inlet 41, the housing oil hole, and the second oil groove 43 along the axial direction of the motor shaft 2, without needing to consider their relative positions along the circumferential direction of the motor shaft 2. This facilitates the assembly of the housing 1, the motor shaft 2, and the sealing ring 4, improves the assembly efficiency of the electric drive assembly, and further reduces the cost of the electric drive assembly.

[0102] Optionally, there are multiple oil inlet holes 41, which are arranged at intervals along the circumference of the motor shaft 2, and all of the multiple oil inlet holes 41 are connected to the second oil groove 43.

[0103] For example, there are four oil inlet holes 41, which are arranged at intervals along the circumference of the motor shaft 2.

[0104] By setting the number of oil inlet holes 41 to multiple and arranging the multiple oil inlet holes 41 at intervals along the circumference of the motor shaft 2, the cooling oil in the second oil groove 43 can enter the multiple oil inlet holes 41 at the same time, thereby increasing the flow rate of cooling oil in the annular cavity 21 and improving the cooling and heat dissipation effect of the electric drive assembly.

[0105] Optionally, as shown in Figure 2, the housing 1 has an annular sealing surface 11, with one end of the housing oil hole penetrating through the sealing surface 11. A sealing ring 4 is disposed on the inner side of the sealing surface 11, and the outer peripheral surface of the sealing ring 4 is in sealing engagement with the sealing surface 11.

[0106] By sealing the sealing ring 4 with the sealing surface 11 and passing one end of the housing oil hole through the sealing surface 11, the sealing ring 4 and the sealing surface 11 can seal the connection between the housing oil hole and the oil inlet hole 41, preventing leakage of cooling oil during the process of entering the oil inlet hole 41 from the housing oil hole. This further reduces the leakage of cooling oil inside the electric drive assembly and further improves the reliability of the electric drive assembly.

[0107] Therefore, the sealing between the sealing ring 4 and the housing 1, as well as the sealing at the connection between the housing oil hole and the oil inlet hole 41, can be achieved simultaneously, which helps to simplify the structure of the electric drive assembly and reduce the cost of the electric drive assembly.

[0108] Optionally, the outer circumferential surface of the sealing ring 4 is interference-fitted with the sealing surface 11.

[0109] By interfering with the outer circumferential surface of the sealing ring 4 and the sealing surface 11, a sealing fit between the outer circumferential surface of the sealing ring 4 and the sealing surface 11 can be achieved without adding any other components. This further simplifies the structure of the electric drive assembly and reduces its cost.

[0110] Optionally, as shown in Figure 2, the sealing ring 4 and the adapter shaft 3 are clearance-fitted.

[0111] It is understandable that the adapter shaft 3 is connected to the reducer. After the reducer speeds up, the speed of the adapter shaft 3 is relatively low. By fitting the sealing ring 4 with the adapter shaft 3 with a clearance, the requirements for micro-leakage of cooling oil can be met, and the drag loss of the sealing ring 4 on the rotation of the adapter shaft 3 can be reduced, thereby improving the efficiency of the electric drive assembly.

[0112] Optionally, as shown in Figure 2, the electric drive assembly further includes an annular seal 8, which is disposed between the adapter shaft 3 and the sealing ring 4. The outer circumferential surface of the seal 8 is interference-fitted with the inner circumferential surface of the sealing ring 4, and the inner circumferential surface of the seal 8 is clearance-fitted with the adapter shaft 3.

[0113] By setting a seal 8, with the outer circumferential surface of the seal 8 and the inner circumferential surface of the sealing ring 4 being press-fitted, and the inner circumferential surface of the seal 8 and the adapter shaft 3 being clearance-fitted, the sealing performance between the sealing ring 4 and the adapter shaft 3 can be improved, the leakage of cooling oil between the sealing ring 4 and the adapter shaft 3 can be reduced, thereby further reducing the leakage of cooling oil in the electric drive assembly and further improving the reliability of the electric drive assembly.

[0114] Optionally, seal 8 is a plastic ring.

[0115] For example, seal 8 is made of PTFE (polytetrafluoroethylene).

[0116] By making the seal 8 a plastic ring, the seal 8 can deform and press against the sealing ring 4 under the pressure of the cooling oil, thereby improving the sealing performance between the seal 8 and the sealing ring 4, reducing the amount of cooling oil leakage between the sealing ring 4 and the adapter shaft 3, and further reducing the amount of cooling oil leakage inside the electric drive assembly, thereby further improving the reliability of the electric drive assembly.

[0117] Optionally, as shown in Figure 2, there are multiple seals 8, which are arranged at intervals along the axial direction of the motor shaft 2.

[0118] For example, as shown in Figure 2, there are two seals 8, which are respectively located on the left and right sides of the second oil groove 43 and are both sealed to the sealing ring 4.

[0119] By setting multiple seals 8, the sealing performance between the seal 8 and the sealing ring 4 can be further improved, the leakage of cooling oil between the sealing ring 4 and the adapter shaft 3 can be reduced, thereby further reducing the leakage of cooling oil in the electric drive assembly and further improving the reliability of the electric drive assembly.

[0120] Optionally, the adapter shaft 3 is provided with an annular mounting groove, which is arranged around the circumference of the motor shaft 2, and the seal 8 is disposed in the mounting groove.

[0121] By setting an installation groove on the adapter shaft 3, when installing the seal 8, the seal 8 can be first placed in the installation groove, and the axial positioning of the seal 8 can be achieved by using the installation groove. Then, the sealing ring 4 is placed on the outside of the adapter shaft 3, which facilitates the installation and fixing of the seal 8.

[0122] In some embodiments, as shown in FIG2, the electric drive assembly further includes a rotor core 5, which is disposed within the housing 1 and sleeved on the motor shaft 2. The rotor core 5 is provided with a rotor oil passage 51, and the motor shaft 2 is provided with a transition hole 22. The rotor oil passage 51 extends axially along the motor shaft 2, and the transition hole 22 extends radially along the motor shaft 2. The inner end of the transition hole 22 communicates with the annular cavity 21, and the outer end of the transition hole 22 communicates with the rotor oil passage 51.

[0123] Therefore, the cooling oil in the annular cavity 21 can enter the rotor oil passage 51 through the transition hole 22 to cool and dissipate heat from the rotor core 5, thereby reducing the temperature of the rotor core 5 during the operation of the electric drive assembly and further improving the reliability of the electric drive assembly.

[0124] Optionally, as shown in Figure 2, the electric drive assembly also includes a cover plate 6 and a stator winding 7. The cover plate 6 is located at both axial ends of the rotor core 5, and the cover plate 6 has oil injection holes that communicate with the rotor oil passage 51. The cooling oil in the oil injection holes can be sprayed towards the winding ends of the stator winding 7 under the action of centrifugal force. The cover plate 6 is connected to the rotor core 5, and the rotor oil passage 51 extends axially through both ends of the motor shaft 2.

[0125] Therefore, the cooling oil in the rotor oil passage 51 can enter the oil spray hole of the cover plate 6 and be sprayed to the winding end of the stator winding 7 through the oil spray hole, thereby achieving cooling and heat dissipation of the winding end of the stator winding 7 and further improving the reliability of the electric drive assembly.

[0126] Optionally, as shown in Figure 2, one axial end of the adapter shaft hole 31 penetrates the end face of the adapter shaft 3, forming an opening on the end face of the adapter shaft 3. The electric drive assembly also includes a plug 9, which seals the opening.

[0127] One axial end of the adapter shaft hole 31 passes through the end face of the adapter shaft 3, which facilitates the machining and manufacturing of the adapter shaft hole 31, thereby facilitating the machining and manufacturing of the electric drive assembly and helping to reduce the cost of the electric drive assembly.

[0128] As shown in Figure 3, the electric drive assembly includes an oil tank 10, a coarse filter 20, an oil pump 30, a fine filter 40, a heat exchanger 50, a solenoid valve 60, a reducer gear 70, and a reducer bearing 80. The oil pump 30's suction port is connected to the coarse filter 20, and its outlet port is connected to the fine filter 40. The cooling oil at the bottom of the oil tank 10, driven by the oil pump 30, first enters the coarse filter 20. The cooling oil filtered by the coarse filter 20 then enters the oil pump 30. The cooling oil flowing out of the oil pump 30 flows through the fine filter 40, and the filtered cooling oil then enters different oil passages. One stream of cooling oil enters the motor after heat exchange in heat exchanger 50, achieving cooling and heat dissipation. Specifically, one stream of cooling oil enters the annular cavity 21 through the housing oil hole, oil inlet 41, and adapter shaft hole 31 to cool the rotor 101. Another stream of cooling oil enters the stator core and flows out through the oil spray ring to cool the stator 102. A third stream of cooling oil enters the reducer, where it splits into gear lubrication and bearing lubrication circuits to lubricate and cool the reducer gears 70 and bearings 80, respectively. A solenoid valve 60 is installed in the oil circuit between heat exchanger 50 and the oil inlet, and throttling orifices 90 are installed in the oil circuit between heat exchanger 50 and the stator, as well as in the gear lubrication and bearing lubrication circuits.

[0129] The electric drive assembly of this invention can lubricate and cool the stator, rotor, and reducer of the motor, keeping both the motor and reducer within an optimal operating temperature range and improving the power of the electric drive assembly. Unlike conventional oil injection pipe designs, the electric drive assembly of this invention uses a sealing ring 4 inside the housing 1. Cooling oil enters directly into the annular cavity 21 formed by the motor shaft 2 and the adapter shaft 3 through the oil inlet 41 of the sealing ring 4, thereby cooling the rotor core 5, magnets, etc. The cooling oil thrown out from the rotor of the motor can further cool the winding ends of the stator.

[0130] The vehicle in this embodiment of the invention includes the electric drive assembly described in any of the above embodiments.

[0131] Because the electric drive assembly of this invention has a low cost, the vehicle of this invention has advantages such as low cost.

[0132] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An electric drive assembly, comprising: a housing provided with a housing oil hole; a motor shaft rotatably arranged in the housing, the motor shaft being provided with a motor shaft hole extending in an axial direction of the motor shaft; an adapter shaft arranged in the motor shaft hole, the motor shaft hole and the adapter shaft defining an annular cavity therebetween; a sealing ring arranged in the housing in sealing engagement with the housing, the sealing ring being arranged around an outer side of the adapter shaft and on an axial side of the motor shaft, the sealing ring being provided with an oil inlet hole extending in the axial direction of the motor shaft, the oil inlet hole being in communication with the housing oil hole and the annular cavity.

2. The electric drive assembly of claim 1, wherein, an end of the oil inlet hole away from the motor shaft is in communication with the housing oil hole, and an end of the oil inlet hole towards the motor shaft is in communication with the annular cavity.

3. The electric drive assembly of claim 1, wherein, the adapter shaft is provided with an adapter shaft hole extending in the axial direction of the motor shaft, the adapter shaft hole being in communication with the annular cavity; the oil inlet hole is in communication with the housing oil hole and the adapter shaft hole.

4. The electric drive assembly of any of claims 1-3, wherein, the oil inlet hole gradually inclines towards an inner side of the motor shaft in a direction close to the motor shaft.

5. The electric drive assembly of any of claims 1-4, wherein, a port of the annular cavity towards the sealing ring forms an oil cavity inlet, and a projection of the oil inlet hole in the extending direction thereof covers a portion of the oil cavity inlet.

6. The electric drive assembly of any one of claims 1-5, wherein, the annular cavity comprises a first section and a second section, the first section being arranged between the second section and the sealing ring in the axial direction of the motor shaft, and a radial dimension of the first section being smaller than a radial dimension of the second section; and / or the motor shaft hole comprises an oil inlet section arranged closer to the sealing ring than a remaining portion of the motor shaft hole in the axial direction of the motor shaft, the oil inlet section being provided with a helical groove extending in the axial direction of the motor shaft.

7. The electric drive assembly according to any one of claims 1-6, wherein, the adapter shaft is provided with a first communication hole and a second communication hole extending in a radial direction of the motor shaft, the first communication hole and the second communication hole being arranged in the axial direction of the motor shaft, the first communication hole being in communication with the oil inlet hole and the adapter shaft hole, and the second communication hole being in communication with the adapter shaft hole and the annular cavity.

8. The electric drive assembly of claim 7, wherein, the sealing ring is provided with a first oil groove arranged around the adapter shaft on an inner side of the oil inlet hole, an inner end of the oil inlet hole penetrating a groove bottom wall of the first oil groove, and a groove opening of the first oil groove being arranged on an inner circumferential surface of the sealing ring and in communication with the first communication hole.

9. The electric drive assembly of claim 8, wherein, a plurality of the oil inlet holes are arranged in a circumferential direction of the motor shaft, and the plurality of the oil inlet holes are in communication with the first oil groove; and / or a plurality of the first communication holes are arranged in the circumferential direction of the motor shaft, and the plurality of the first communication holes are in communication with the first oil groove.

10. The electric drive assembly of any of claims 1-9, wherein, the sealing ring is provided with a second oil groove arranged around the adapter shaft on an outer side of the oil inlet hole, an outer end of the oil inlet hole penetrating a groove bottom wall of the second oil groove, and a groove opening of the second oil groove being arranged on an outer circumferential surface of the sealing ring and in communication with the housing oil hole.

11. The electric drive assembly of claim 10, wherein, a plurality of the oil inlet holes are arranged in the circumferential direction of the motor shaft, and the plurality of the oil inlet holes are in communication with the second oil groove.

12. The electric drive assembly of any one of claims 1-11, wherein, The shell has an annular sealing surface, one end of the shell oil hole penetrates the sealing surface, and the sealing ring is in sealing cooperation with the sealing surface.

13. The electric drive assembly of claim 12, wherein, The sealing ring is arranged on the inner side of the sealing surface, and the outer peripheral surface of the sealing ring is in sealing cooperation with the sealing surface. The sealing ring further comprises an oil inlet groove, the groove opening of the oil inlet groove is arranged on the outer peripheral surface of the sealing ring and communicates with the shell oil hole, the oil inlet hole is arranged between the oil inlet groove and the motor shaft in the axial direction of the motor shaft, and one end of the oil inlet hole away from the motor shaft penetrates the groove side wall of the oil inlet groove.

14. The electric drive assembly of any one of claims 1-13, wherein, The sealing ring is in clearance cooperation with the adapter shaft.

15. The electric drive assembly of claim 14, wherein, The electric drive assembly further comprises an annular sealing member arranged between the adapter shaft and the sealing ring, the outer peripheral surface of the sealing member is in interference cooperation with the inner peripheral surface of the sealing ring, and the inner peripheral surface of the sealing member is in clearance cooperation with the adapter shaft.

16. The electric drive assembly of any one of claims 1-15, wherein, The electric drive assembly further comprises a rotor core arranged in the shell and sleeved on the outer side of the motor shaft, the rotor core is provided with a rotor oil channel and a communication hole, the rotor oil channel extends along the axial direction of the motor shaft, the communication hole extends along the radial direction of the motor shaft, the inner end of the communication hole penetrates the hole wall of the motor shaft hole, and the outer end of the communication hole communicates with the rotor oil channel.

17. A vehicle comprising the electric drive assembly according to any one of claims 1-16.

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