Electric drive assembly and vehicle

Abstract

NOT VISIBLE DUE TO STATUS OF PATENT

Description

Electric drive assembly and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202510236815.8, filed on February 28, 2025, entitled "Electric Drive Assembly and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of electric drive assembly technology, and particularly to an electric drive assembly and vehicle. Background Technology

[0003] The electric drive system integrates the drive motor and reducer of an electric vehicle, serving as the power source for the vehicle's propulsion. The heat dissipation performance of the drive motor has a direct impact on the overall vehicle's power performance.

[0004] The stator and rotor are the main heat sources during the operation of a drive motor. Currently, common cooling methods for drive motors include water cooling and oil cooling. Among them, oil cooling has higher cooling efficiency due to its reliable electrical insulation properties, direct contact with the stator and rotor, and ability to cool them. In addition, oil cooling can also lubricate the components in the electric drive assembly.

[0005] In order to achieve cooling of the stator and rotor and lubrication of the components in the electric drive assembly, the cooling and lubrication system in the oil-cooled electric drive assembly is mostly quite complex, which limits the improvement of the overall power density of the electric drive assembly and also increases the overall flow resistance of the cooling and lubrication oil circuit. Summary of the Invention

[0006] Therefore, this disclosure provides an electric drive assembly and vehicle that simplifies the cooling and lubrication oil circuit in the electric drive assembly. The technical solution is as follows:

[0007] In a first aspect, an electric drive assembly is provided, the electric drive assembly including a motor assembly, a reducer shaft and gear assembly, and a cooling and lubrication oil circuit;

[0008] The motor assembly is connected to the reducer shaft and gear assembly in a transmission connection, and both the motor assembly and the reducer shaft and gear assembly have matching bearing assemblies;

[0009] The cooling and lubrication circuit includes an oil pump assembly, a main oil circuit, branch oil circuits, an oil injection pipe, and multiple bearing lubrication circuits. The oil pump assembly is used to pump oil to the main oil circuit. The branch oil circuits and the oil injection pipes are all connected to the main oil circuit. The bearing lubrication circuits correspond one-to-one with the bearings in the bearing assembly.

[0010] The branch oil circuit is used to output oil to the motor assembly. The oil injection pipe has multiple first oil injection ports, which correspond to multiple bearings in the bearing assembly, so that oil can be sprayed from the first oil injection ports onto the corresponding bearings to form corresponding bearing lubrication oil circuits.

[0011] In one possible implementation, the electric drive assembly further includes an oil cooler having an oil inlet and an oil outlet. The oil inlet is connected to the main oil passage, and the oil outlet is connected to the branch oil passage, so that the oil in the main oil passage can pass through the oil cooler and be cooled before entering the branch oil passage.

[0012] In one possible implementation, the motor assembly includes a shaft, a rotor, a stator, and stator windings. The shaft is drively connected to the input shaft of the reducer gear assembly. The rotor is sleeved on the outer periphery of the shaft. The stator is arranged around the axis of the rotor on the outer periphery of the rotor. The stator windings are wound on the inner side of the stator.

[0013] The branch oil circuit includes a first sub-oil circuit and a second sub-oil circuit. The first sub-oil circuit is connected to the main oil circuit and is used to output oil to the rotating shaft, the rotor and the stator winding. The second sub-oil circuit is connected to the main oil circuit and is used to output oil to the stator.

[0014] In one possible implementation, the electric drive assembly further includes an oil cooler having an oil inlet and an oil outlet, the oil outlet including a first oil outlet and a second oil outlet;

[0015] The first oil outlet is connected to the first sub-oil circuit, so that the oil cooled by the oil cooler can enter the first sub-oil circuit from the first oil outlet.

[0016] The second oil outlet is connected to the second sub-oil circuit, so that the oil cooled by the oil cooler can enter the second sub-oil circuit from the second oil outlet.

[0017] In one possible implementation, the fuel injection pipe is connected to the portion of the main fuel line located between the fuel pump assembly and the oil cooler.

[0018] In one possible implementation, the rotating shaft has a hollow oil cavity extending along its own axial direction;

[0019] The rotor has multiple rotor oil passages extending along its own axial direction, and the multiple rotor oil passages are distributed at intervals around the axis of the rotor.

[0020] All of the rotor oil circuits are connected to the hollow oil cavity, and the first sub-oil circuit is connected to the hollow oil cavity.

[0021] In one possible implementation, the electric drive assembly further includes two rotor end plates, which are sleeved on the outer periphery of the shaft and located at the two axial ends of the rotor, respectively.

[0022] The rotor end plate has multiple end plate oil inlet holes and multiple end plate oil outlet holes. The multiple end plate oil outlet holes all penetrate the corresponding rotor end plate along the axial direction, and the multiple end plate oil inlet holes and multiple end plate oil outlet holes are distributed at intervals around the axis of the rotor.

[0023] Each of the end plate oil inlets is connected to the hollow oil cavity, and each of the rotor oil passages is connected at one end to the end plate oil inlet of one rotor end plate and at the other end to the end plate oil outlet of another rotor end plate.

[0024] In one possible implementation, the cooling and lubricating oil passage further includes two annular oil passages, which are located at the two axial ends of the stator, and one of the two annular oil passages is connected to the second sub-oil passage.

[0025] The stator has multiple stator oil passages extending along its own axial direction. The stator oil passages are distributed at intervals around the axis of the stator, and the two ends of the stator are respectively connected to two of the annular oil passages.

[0026] In one possible implementation, both of the annular oil passages have a plurality of second oil injection ports, which are spaced apart along the corresponding annular oil passages and all face the stator winding, so that oil can be sprayed from the second oil injection ports onto the stator winding.

[0027] In a second aspect, a vehicle is provided, the vehicle including an electric drive assembly as described in any of the first aspects.

[0028] In the scheme disclosed herein, the oil pump assembly pumps the oil from the main oil circuit into the branch oil circuit and the injection pipe, thus enabling the oil to be output to the motor assembly through the branch oil circuit to cool the motor assembly. The oil is then sprayed onto multiple bearings through the first injection port of the injection pipe to form corresponding bearing lubrication oil circuits, thereby lubricating the corresponding bearings.

[0029] Thus, not only is cooling of the motor components achieved, but lubrication of multiple bearings is also achieved through the setting of a single oil injection pipe, which greatly simplifies the cooling and lubrication oil circuit in the electric drive assembly, which is conducive to improving the overall power density of the electric drive, and at the same time, it also helps to reduce the overall flow resistance of the cooling and lubrication oil circuit. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 is a schematic diagram of the cooling and lubrication oil circuit structure of an electric drive assembly provided in an embodiment of this disclosure;

[0032] Figure 2 is a schematic diagram of the cooling and lubrication oil circuit structure of an electric drive assembly from another angle according to an embodiment of this disclosure;

[0033] Figure 3 is a schematic diagram of the structure of a fuel injection pipe provided in an embodiment of this disclosure;

[0034] Figure 4 is a cross-sectional schematic diagram of a partial structure of an electric drive assembly provided in an embodiment of this disclosure;

[0035] Figure 5 is a schematic diagram of the structure of a rotor end plate provided in an embodiment of this disclosure;

[0036] Figure 6 is a schematic diagram of the structure of a stator end sealing oil ring provided in an embodiment of this disclosure.

[0037] Explanation of reference numerals in the attached diagram: 1. Oil pump assembly; 11. Electric oil pump; 12. Filter press chamber; 2. Main oil circuit; 21. First sub-oil circuit; 22. Second sub-oil circuit; 221. Oil inlet circuit for rear bearing of shaft; 222. Lubricating oil circuit for rear bearing of shaft; 3. Injection pipe; 31. First injection port; 311. Lubricating oil circuit for rear bearing of output shaft; 312. Lubricating oil circuit for front bearing of differential; 313. Lubricating oil circuit for rear bearing of differential; 32. Mounting hole; 33. Oil inlet end; 41. Shaft; 411. Hollow oil chamber; 412. Oil slinger hole of shaft; 42. Rotor; 421. Rotor oil circuit; 43. Stator; 431. Stator oil circuit; 44. Stator winding; 5. Oil cooler; 51. Oil inlet; 52. First oil outlet; 53. Second oil outlet; 54. Water inlet; 55. Water outlet; 6. Rotor end plate; 61. End plate oil inlet hole; 611. End plate oil inlet groove; 62. End plate oil outlet hole; 63. End plate mounting hole; 7. Annular oil passage; 70. Stator end sealing oil ring; 71. Second oil spray port; 8. Housing; 81. Input shaft front bearing lubrication oil passage; 82. Output shaft front bearing lubrication oil passage; 83. Bearing intermediate oil passage; 84. Input shaft rear bearing lubrication oil passage; 9. Input shaft; 91. Input shaft oil pipe; 911. Input shaft oil passage; 92. Rotor oil inlet pipe; 921. Rotor oil inlet passage. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0039] This embodiment relates to an electric drive assembly that integrates a drive motor and a reducer for an electric vehicle. Therefore, the electric drive assembly includes a motor assembly, a reducer gear assembly, and a housing for mounting the motor assembly and the reducer gear assembly. Both the motor assembly and the reducer gear assembly can be mounted inside the housing via bearings from corresponding bearing sets. For example, the housing may include a reducer housing, a main housing 8, and a motor rear cover connected in sequence. These components can be fixed together by bolts, allowing the motor assembly and the reducer gear assembly to be stably mounted inside the cavity formed by the reducer housing, the main housing 8, and the motor rear cover.

[0040] The reducer gear assembly may include an input shaft 9, an output shaft, and a differential. An input shaft gear may be fixedly mounted on the input shaft 9, and this input shaft gear is connected to the motor assembly via a transmission connection. An output shaft gear may be fixedly mounted on the output shaft, and this output shaft gear is connected to the input shaft 9 via a meshing transmission connection with the input shaft gear. The differential may have differential half-shaft gears, and these gears are connected to the output shaft via a meshing transmission connection with the input shaft gear.

[0041] Furthermore, the bearing assembly may include a front input shaft bearing, a rear input shaft bearing, a front output shaft bearing, a rear output shaft bearing, a front differential bearing, and a rear differential bearing. The two ends of the input shaft 9 can be mounted in the housing via the front and rear input shaft bearings, respectively; the two ends of the output shaft can be mounted in the housing via the front and rear output shaft bearings, respectively; and the two ends of the differential can be mounted in the housing via the front and rear differential bearings, respectively.

[0042] To achieve cooling and lubrication of the motor assembly and the reducer gear assembly, the electric drive assembly also includes a cooling and lubrication oil circuit. Figure 1 shows a schematic diagram of the cooling and lubrication oil circuit structure of the electric drive assembly, and Figure 2 shows another angle of the cooling and lubrication oil circuit structure. The cooling and lubrication oil circuit includes an oil pump assembly 1, a main oil circuit 2, branch oil circuits, an oil injection pipe 3, and multiple bearing lubrication oil circuits. The main oil circuit 2 and branch oil circuits can be formed by pipes, or by holes, grooves, or other forms on the housing or components, as long as a defined oil flow path is formed. In this embodiment, the main oil circuit 2 and branch oil circuits can be integrated into the reducer housing, the main housing 8, and the motor rear cover, thereby avoiding complex piping components and improving the overall power density of the electric drive assembly.

[0043] Referring again to Figures 1 and 2, the oil pump assembly 1 is used to pump engine oil into the main oil circuit 2. The oil pump assembly 1 may include an electric oil pump 11 and a filter press chamber 12, as shown in Figure 1. The electric oil pump 11 draws oil from the bottom of the housing into the filter press chamber 12, where impurities are filtered out before being delivered to the main oil circuit 2. Branch oil circuits and injection pipes 3 are connected to the main oil circuit 2. The bearing lubrication oil circuit corresponds one-to-one with the bearings in the bearing assembly, used to lubricate the corresponding bearings.

[0044] The branch oil circuit is used to output oil to the motor assembly, and the oil injection pipe 3 has multiple first oil injection ports 31. The multiple first oil injection ports 31 correspond to multiple bearings in the bearing assembly, so that oil can be sprayed from the first oil injection ports 31 onto the corresponding bearings to form corresponding bearing lubrication oil circuits.

[0045] Figure 3 shows a schematic diagram of the structure of the fuel injection pipe 3. The fuel injection pipe 3 has an inlet end 33. The fuel injection pipe 3 can be connected to the main fuel line 2 through the inlet end 33. In Figure 3, the number of first fuel injection ports 31 of the fuel injection pipe 3 can be five, but the number of first fuel injection ports 31 of the fuel injection pipe 3 can also be four, three or two, etc.

[0046] In this embodiment, taking the example of five first oil injection ports 31 in the oil injection pipe 3 as shown in Figure 3, three of the first oil injection ports 31 can correspond one-to-one with the output shaft rear bearing, the differential front bearing, and the differential rear bearing, respectively. These three first oil injection ports 31 can spray the oil entering the oil injection pipe 3 to the output shaft rear bearing, the differential front bearing, and the differential rear bearing, respectively, thereby forming the output shaft rear bearing lubrication oil passage 311, the differential front bearing lubrication oil passage 312, and the differential rear bearing lubrication oil passage 313. At the same time, the other two first oil injection ports 31 can spray the oil onto the meshing point between the input shaft gear and the output shaft gear, as well as the differential half-shaft gear, respectively, to achieve lubrication of the input shaft gear, the output shaft gear, and the differential half-shaft gear.

[0047] In detail, the number and orientation of the first oil injection port 31 can be adjusted according to the gear mounting positions of the bearings and reducer shaft gear assembly in the electric drive assembly, so that the oil can be sprayed to the parts in the electric drive assembly that need lubrication.

[0048] As described above, the oil pump assembly 1 can pump the oil from the main oil circuit 2 into the branch oil circuit and the oil injection pipe 3. Therefore, it can output oil to the motor assembly through the branch oil circuit to cool the motor assembly. The oil is also sprayed onto multiple bearings through the first oil injection port 31 of the oil injection pipe 3 to form corresponding bearing lubrication oil circuits, thereby lubricating the corresponding bearings. At the same time, the oil can also be sprayed onto the gears of the reducer shaft gear assembly through the first oil injection port 31 to lubricate the corresponding gears.

[0049] Thus, not only is cooling of the motor components achieved, but lubrication of multiple bearings and gears is also achieved through the setting of one oil injection pipe 3. This not only greatly simplifies the cooling and lubrication oil circuit in the electric drive assembly, which is conducive to improving the overall power density of the electric drive assembly, but also helps to reduce the overall flow resistance of the cooling and lubrication oil circuit.

[0050] In one example, since the oil circulates inside the housing of the electric drive assembly and cools the motor assembly through branch oil lines, the oil may have a high temperature after it has finished cooling the motor assembly and fallen back to the bottom of the housing. Consequently, the oil that is pumped back to the main oil line 2 by the oil pump assembly 1 may have a high temperature.

[0051] Accordingly, continuing to refer to Figures 1 and 2, the electric drive assembly also includes an oil cooler 5, which has an oil inlet 51 and an oil outlet. The oil inlet 51 is connected to the main oil passage 2, and the oil outlet is connected to the branch oil passage, so that the oil in the main oil passage 2 can pass through the oil cooler 5 and be cooled before entering the branch oil passage.

[0052] For example, the oil cooler 5 can be fixedly installed on the side of the main housing 8 by bolts, screws, etc. The oil cooler 5 also has an inlet 54 and an outlet 55, so that water can enter the oil cooler 5 from the inlet 54 and leave the oil cooler 5 from the outlet 55. The interior of the oil cooler 5 has an oil-water separated heat dissipation layer, which allows the oil and water entering the oil cooler 5 to exchange heat, thereby achieving the purpose of cooling the oil.

[0053] Therefore, the oil cooler 5 can cool the oil before it re-enters the branch oil circuit, which helps to improve the cooling efficiency of the motor components.

[0054] In one example, Figure 4 shows a cross-sectional view of the electric drive assembly. The motor assembly includes a shaft 41, a rotor 42, a stator 43, and a stator winding 44. The shaft 41 is connected to the input shaft 9 of the reducer gear assembly. For example, one end of the shaft 41 can have an external spline structure, and one end of the input shaft 9 has an internal spline structure. One end of the shaft 41 and the input shaft 9 can be connected by the fit of the external and internal spline structures, and the other end can be mounted on the rear cover of the motor through a rear bearing.

[0055] Referring to Figure 4, the rotor 42 is sleeved on the outer periphery of the shaft 41, the stator 43 is arranged around the axis of the rotor 42 on the outer periphery of the rotor 42, the stator winding 44 is wound on the inner side of the stator 43, and the stator winding 44 can extend from both ends of the stator 43 in the axial direction.

[0056] For example, the stator 43 can be fixedly installed inside the main housing 8. For example, the stator 43 and the main housing 8 can be an interference fit. During assembly, the main housing 8 is heated first, and then the stator 43 is pressed into the main housing 8. After the main housing 8 cools down, the stator 43 and the main housing 8 are fixed together.

[0057] Referring again to Figures 1 and 2, the branch oil circuit includes a first sub-oil circuit 21 and a second sub-oil circuit 22. The first sub-oil circuit 21 is connected to the main oil circuit 2 and is used to output oil to the shaft 41, rotor 42, and stator winding 44. The second sub-oil circuit 22 is connected to the main oil circuit 2 and is used to output oil to the stator 43. Thus, through the first sub-oil circuit 21 and the second sub-oil circuit 22, oil can be output to the shaft 41, rotor 42, stator 43, and stator winding 44 respectively, and each can be cooled separately, thereby achieving high cooling efficiency.

[0058] In one example, continuing to refer to Figures 1 and 2, the electric drive assembly further includes an oil cooler 5, which has an oil inlet 51 and an oil outlet. The oil outlet includes a first oil outlet 52 and a second oil outlet 53. The first oil outlet 52 is connected to a first sub-oil passage 21, allowing oil cooled by the oil cooler 5 to enter the first sub-oil passage 21 from the first oil outlet 52. The second oil outlet 53 is connected to a second sub-oil passage 22, allowing oil cooled by the oil cooler 5 to enter the second sub-oil passage 22 from the second oil outlet 53.

[0059] Therefore, since the oil cooler 5 has a first oil outlet 52 and a second oil outlet 53, the oil entering the oil cooler 5 can be respectively directed into the first sub-oil passage 21 and the second sub-oil passage 22. Thus, the oil can be separated into two streams in the oil cooler 5, entering the first sub-oil passage 21 and the second sub-oil passage 22 respectively, thereby allowing the oil to have a larger cooling area in the oil cooler 5, which is beneficial to improving the oil cooling efficiency.

[0060] In one example, continuing to refer to Figure 1, the fuel injection pipe 3 is connected to the main fuel line 2 in the section between the oil pump assembly 1 and the oil cooler 5.

[0061] Therefore, since the oil injection pipe 3 is connected between the oil cooler 5 and the oil pump assembly 1, the oil entering the oil injection pipe 3 still has a high temperature, and thus the oil sprayed from the first oil injection port 31 still has a high pressure, thereby preventing the oil from not being able to fully enter the corresponding bearing lubrication circuit to lubricate the corresponding bearing.

[0062] In one example, referring to Figure 4, the shaft 41 has a hollow oil cavity 411 extending along its own axial direction. The rotor 42 has a plurality of rotor oil passages 421 extending along its own axial direction, the plurality of rotor oil passages 421 being distributed at intervals around the axis of the rotor 42.

[0063] In this configuration, multiple rotor oil passages 421 are connected to the hollow oil cavity 411. For example, sub-oil passages are provided in the rotor 42, which are respectively connected to the rotor oil passages 421 and the hollow oil cavity 411, thereby connecting the hollow oil cavity 231 and the rotor oil passages 221; or, sub-oil passages are provided in other components of the motor assembly to connect the hollow oil cavity 231 and the rotor oil passages 221.

[0064] The first sub-oil passage 21 is connected to the hollow oil cavity 411. For example, as shown in Figure 4, the input shaft 9 can be a hollow structure. The electric drive assembly may also include an input shaft oil pipe 91 and a rotor inlet oil pipe 92. The input shaft oil pipe 91 can be located inside the hollow structure of the input shaft 9 and is interference-fitted with the input shaft 9. The rotor inlet oil pipe 92 can be interference-fitted with the reducer housing and is connected to the first sub-oil passage 21 extending to the reducer housing via the rotor inlet oil passage 921. The first end of the input shaft oil pipe 91 can be clearance-fitted with the rotor inlet oil pipe 92 and is connected to the rotor inlet oil passage 921 via the input shaft oil passage 911. The second end of the input shaft oil pipe 91 can be connected to the hollow oil cavity 411 via the input shaft oil passage 911.

[0065] As described above, the oil can flow from the first sub-oil passage 21 through the rotor oil inlet passage 921 and the input shaft oil pipe 91 into the hollow oil cavity 411 and the rotor oil passage 421, thereby cooling the shaft 41 and the rotor 42. Therefore, by providing a hollow oil cavity 411 in the shaft 41 and a rotor oil passage 421 in the rotor 42, space is saved from additional oil piping arrangements, improving the space utilization of the electric drive assembly and making its structure more compact. Furthermore, it achieves higher cooling efficiency for the shaft 41 and the rotor 42.

[0066] In one example, multiple rotor oil passages 421 are evenly distributed around the axis of rotor 42, thereby improving the uniformity of cooling of rotor 42.

[0067] In one example, as shown in Figure 5, which is a schematic diagram of the rotor end plate 6, and in conjunction with Figure 4, the electric drive assembly also includes two rotor end plates 6. The two rotor end plates 6 are sleeved on the outer periphery of the rotating shaft 41 and are located at opposite axial ends of the rotor 42. For example, the rotor end plate 6 may have an end mounting hole 63 in its middle portion, allowing it to be fixedly sleeved on the outer periphery of the rotating shaft 41.

[0068] The rotor end plate 6 has multiple end plate oil inlet holes 61 and multiple end plate oil outlet holes 62. The multiple end plate oil outlet holes 62 all penetrate the corresponding rotor end plate 6 axially, and the multiple end plate oil inlet holes 61 and multiple end plate oil outlet holes 62 are distributed at intervals around the axis of the rotor 42. Each end plate oil inlet hole 61 is connected to the hollow oil cavity 411.

[0069] For example, both rotor end plates 6 may each have multiple end plate oil inlet grooves 611, and the rotating shaft 41 may have multiple rotating shaft oil throwing holes 412. The rotating shaft oil throwing holes 412 correspond one-to-one with the end plate oil inlet grooves 611 and end plate oil inlet holes 61 of the two rotor end plates 6. The two ends of the end plate oil inlet grooves 611 can be connected to the corresponding end mounting holes 63 and end plate oil inlet holes 61 respectively, so that when the rotor end plates 6 are assembled on the rotating shaft 41, the two ends of the rotating shaft oil throwing holes 412 can be connected to the corresponding end plate oil inlet grooves 611 and hollow oil cavities 411 respectively.

[0070] Furthermore, each rotor oil passage 421 is connected at one end to the oil inlet hole 61 of one rotor end plate 6, and at the other end to the oil outlet hole 62 of another rotor end plate 6.

[0071] As described above, the oil in the hollow oil cavity 411 can enter from one end of the rotor oil passage 421 through the rotating shaft oil throwing hole 412, the end plate oil inlet groove 611 and the end plate oil inlet hole 61 in sequence, and flow to the other end of the rotor oil passage 421 and flow out from the end plate oil outlet hole 62 of another rotor end plate 6.

[0072] Thus, on the one hand, the uniformity of cooling of rotor 42 can be improved, and on the other hand, the oil flowing out from the oil outlet 62 of the end plate can be thrown to the inside of stator winding 44 to cool stator winding 44, and then fall into the bottom of the housing to wait to be drawn by electric oil pump 11 again.

[0073] In one example, continuing to refer to Figure 4 and in conjunction with Figures 1 and 2, the cooling lubrication circuit also includes two annular oil passages 7, which are located at the two axial ends of the stator 43, and one of the two annular oil passages 7 is connected to the second sub-oil passage 22.

[0074] For example, the motor assembly may also include two stator end sealing oil rings 70, as shown in Figure 6, which is a schematic diagram of the stator end sealing oil rings 70. The two stator end sealing oil rings 70 may be located at the two axial ends of the stator 41, respectively. The two stator end sealing oil rings 70 may respectively enclose the inner wall of the main housing 8 and the end face of the stator 43, thereby forming two annular oil passages 7. Furthermore, one end of the second sub-oil passage 22 may extend into the interior of the main housing 8 and communicate with one annular oil passage 7.

[0075] The stator 43 has multiple stator oil passages 431 extending along its own axial direction. The stator oil passages 431 are distributed at intervals around the axis of the stator 43, and the two ends of the stator 43 are respectively connected to two annular oil passages 7.

[0076] As described above, the oil can sequentially enter the first annular oil passage 7, the stator oil passage 431, and the second annular oil passage 7 from the second sub-oil passage 22 to cool the stator 41. Therefore, by providing the stator oil passage 431 in the stator 43 and the annular oil passages 7 at both axial ends of the stator 43, space is saved from the additional oil piping, improving the space utilization of the electric drive assembly and making its structure more compact. Furthermore, it achieves higher cooling efficiency for the stator 43.

[0077] In one example, both annular oil passages 7 have multiple second oil injection ports 71, which are distributed at intervals along the corresponding annular oil passages 7, and all the multiple second oil injection ports 71 face the stator winding 44, so that oil can be sprayed from the second oil injection ports 71 onto the stator winding 44.

[0078] For example, as shown in Figure 4, the two stator end sealing oil rings 70 can respectively surround the periphery of the stator winding 44 extending from both ends of the stator 41 axially. The multiple second oil injection ports 71 can be distributed at intervals along the stator end sealing oil rings 70 as shown in Figure 6, so that the second oil injection ports 71 are all facing the stator winding 44 located inside the stator end sealing oil rings 70.

[0079] Thus, the oil in the annular oil circuit 7 can be sprayed onto the outside of the stator winding 44 through the second oil injection port 71 to cool the stator winding 44.

[0080] Meanwhile, since the stator winding 44 can be cooled by oil on both the inner and outer sides, the heat dissipation efficiency of the stator winding 44 can be improved and the heat dissipation is more uniform.

[0081] In one example, the diameter of the second oil injection port 71 of the second annular oil passage 7 can be larger than the diameter of the second oil injection port 71 of the first annular oil passage 7. Therefore, the oil flow rate from the second oil injection port 71 of the second annular oil passage 7 is greater than the oil flow rate from the second oil injection port 71 of the first annular oil passage 7. This ensures that the oil injected from the second oil injection ports 71 of the two second annular oil passages 7 has a consistent cooling effect on the stator winding 44, thereby improving the uniformity of cooling of the stator winding 44.

[0082] In one example, the distance between the first position and the third position is less than the distance between the second position and the third position. The first position is where the oil is sprayed from the second nozzle 71 of the second annular oil passage 7 onto the stator winding 44 and falls into the main housing 8; the second position is where the oil is sprayed from the second nozzle 71 of the first annular oil passage 7 onto the stator winding 44 and falls into the main housing 8; and the third position is where the oil pump assembly 1 draws oil from the housing.

[0083] In this way, since the oil flow rate at the first position is greater than that at the second position, and the distance between the first and third positions is less than the distance between the second and third positions, more oil has a shorter return path. This increases the oil return speed, resulting in faster oil circulation, which helps reduce the amount of oil added and lowers costs.

[0084] In one example, the main oil passage 2 can be located on the main housing 8. The fuel injection pipe 3 and the main housing 8 can both have corresponding mounting holes 32. The fuel injection pipe 3 can be installed on the main housing 8 by passing through the mounting holes 32 of the fuel injection pipe 3 and screwing it into the mounting holes 32 of the main housing 8 with rod-shaped fasteners such as bolts and screws, thereby enabling the fuel inlet end 33 of the fuel injection pipe 3 to be connected to the main oil passage 2.

[0085] In one example, the cooling and lubrication circuit may further include a rear bearing inlet oil circuit 221, one end of which is connected to the second sub-oil circuit 22, and the other end extends to the rear bearing. Thus, oil in the main oil circuit 2 can be delivered to the rear bearing, forming the rear bearing lubrication circuit 222, thereby achieving lubrication of the rear bearing.

[0086] In one example, the first sub-oil passage 21 can also extend to the input shaft front bearing, thereby enabling the oil in the main oil passage 2 to be delivered to the input shaft front bearing, forming the input shaft front bearing lubrication oil passage 81, and realizing the lubrication of the input shaft front bearing.

[0087] In one example, the cooling and lubrication circuit also includes a bearing intermediate oil passage 83, the two ends of which can extend to the input shaft front bearing and the output shaft front bearing, respectively. Thus, the oil in the input shaft front bearing lubrication circuit 81 can be delivered to the output shaft front bearing, forming the output shaft front bearing lubrication circuit 82, thereby achieving lubrication of the input shaft front bearing.

[0088] In one example, the cooling and lubrication circuit may further include a third sub-circuit 23, which may be connected to the main circuit 2 and extend to the input shaft rear bearing. This allows the oil in the main circuit 2 to be delivered to the input shaft rear bearing, forming an input shaft rear bearing lubrication circuit 84, thereby achieving lubrication of the input shaft rear bearing.

[0089] This embodiment also provides a vehicle that includes an electric drive assembly as described in any of the first aspects.

[0090] The vehicle in this embodiment uses the electric drive assembly disclosed herein and has all the beneficial technical effects of the embodiments disclosed herein.

[0091] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. An electric drive assembly, wherein, The electric drive assembly includes a motor assembly, a reducer shaft gear assembly, and a cooling and lubrication oil circuit. The motor assembly is connected to the reducer shaft and gear assembly in a transmission connection, and both the motor assembly and the reducer shaft and gear assembly have matching bearing assemblies; The cooling and lubrication circuit includes an oil pump assembly (1), a main oil circuit (2), a branch oil circuit, an oil injection pipe (3), and multiple bearing lubrication circuits. The oil pump assembly (1) is used to pump oil to the main oil circuit (2). The branch oil circuit and the oil injection pipe (3) are connected to the main oil circuit (2). The bearing lubrication circuits correspond one-to-one with the bearings in the bearing assembly. The branch oil circuit is used to output oil to the motor assembly. The oil injection pipe (3) has a plurality of first oil injection ports (31). The plurality of first oil injection ports (31) correspond to a plurality of bearings in the bearing assembly, so that oil can be sprayed from the first oil injection port (31) onto the corresponding bearing to form the corresponding bearing lubrication oil circuit.

2. The electric drive assembly according to claim 1, wherein, The electric drive assembly also includes an oil cooler (5), which has an oil inlet (51) and an oil outlet. The oil inlet (51) is connected to the main oil passage (2), and the oil outlet is connected to the branch oil passage, so that the oil in the main oil passage (2) can enter the branch oil passage after being cooled by the oil cooler (5).

3. The electric drive assembly according to claim 1, wherein, The motor assembly includes a shaft (41), a rotor (42), a stator (43), and a stator winding (44). The shaft (41) is connected to the input shaft (9) of the reducer gear assembly. The rotor (42) is sleeved on the outer periphery of the shaft (41). The stator (43) is arranged around the axis of the rotor (42) around the outer periphery of the rotor (42). The stator winding (44) is wound on the inner side of the stator (43). The branch oil circuit includes a first sub-oil circuit (21) and a second sub-oil circuit (22). The first sub-oil circuit (21) is connected to the main oil circuit (2) and is used to output oil to the rotating shaft (41), the rotor (42) and the stator winding (44). The second sub-oil circuit (22) is connected to the main oil circuit (2) and is used to output oil to the stator (43).

4. The electric drive assembly according to claim 3, wherein, The electric drive assembly also includes an oil cooler (5), which has an oil inlet (51) and an oil outlet, the oil outlet including a first oil outlet (52) and a second oil outlet (53). The first oil outlet (52) is connected to the first sub-oil passage (21), so that the oil cooled by the oil cooler (5) can enter the first sub-oil passage (21) from the first oil outlet (52); The second oil outlet (53) is connected to the second sub-oil passage (22), so that the oil cooled by the oil cooler (5) can enter the second sub-oil passage (22) from the second oil outlet (53).

5. The electric drive assembly according to claim 2 or 4, wherein, The fuel injection pipe (3) is connected to the main oil circuit (2) between the oil pump assembly (1) and the oil cooler (5).

6. The electric drive assembly according to claim 3, wherein, The rotating shaft (41) has a hollow oil cavity (411) extending along its own axial direction; The rotor (42) has a plurality of rotor oil passages (421) extending along its own axial direction, the plurality of rotor oil passages (421) being distributed at intervals around the axis of the rotor (42); Multiple rotor oil passages (421) are connected to the hollow oil cavity (411), and the first sub-oil passage (21) is connected to the hollow oil cavity (411).

7. The electric drive assembly according to claim 6, wherein, The electric drive assembly also includes two rotor end plates (6), which are sleeved on the outer periphery of the rotating shaft (41) and located at the two axial ends of the rotor (42), respectively. The rotor end plate (6) has multiple end plate oil inlet holes (61) and multiple end plate oil outlet holes (62). The multiple end plate oil outlet holes (62) all penetrate the corresponding rotor end plate (6) along the axial direction, and the multiple end plate oil inlet holes (61) and the multiple end plate oil outlet holes (62) are all distributed at intervals around the axis of the rotor (42). Each of the end plate oil inlet holes (61) is connected to the hollow oil cavity (411), and each of the rotor oil passages (421) is connected at one end to the end plate oil inlet hole (61) of one rotor end plate (6) and at the other end to the end plate oil outlet hole (62) of another rotor end plate (6).

8. The electric drive assembly according to claim 3, wherein, The cooling and lubricating oil circuit also includes two annular oil circuits (7), which are located at the two axial ends of the stator (43) respectively, and one of the two annular oil circuits (7) is connected to the second sub-oil circuit (22); The stator (43) has a plurality of stator oil passages (431) extending along its own axial direction. The stator oil passages (431) are distributed at intervals around the axis of the stator (43), and the two ends of the stator (43) are respectively connected to two of the annular oil passages (7).

9. The electric drive assembly according to claim 8, wherein, Both of the annular oil passages (7) have a plurality of second oil injection ports (71), which are spaced apart along the corresponding annular oil passages (7) and are all oriented toward the stator winding (44), so that oil can be sprayed from the second oil injection ports (71) onto the stator winding (44).

10. A vehicle, wherein, The vehicle includes the electric drive assembly as described in any one of claims 1 to 9.