Electric drive assembly and vehicle

Abstract

The invention relates to an electric drive assembly and a vehicle, and belongs to the technical field of electric drive assemblies. The electric drive assembly comprises a motor assembly, a speed reducer shaft tooth assembly and a cooling lubricating oil way, the motor assembly is in transmission connection with the speed reducer shaft tooth assembly, the motor assembly and the speed reducer shaft tooth assembly are each provided with a matched bearing set, and the cooling lubricating oil way comprises an oil pumping assembly, a main oil way, a branch oil way, an oil spraying pipe and a plurality of bearing lubricating oil ways. The oil pumping assembly is used for pumping oil to the main oil way, the branch oil ways and the oil spraying pipe communicate with the main oil way, and the bearing lubricating oil ways correspond to bearings in the bearing pack one to one. Wherein the branch oil way is used for outputting oil liquid to the motor assembly, the oil spraying pipe is provided with a plurality of first oil spraying openings, and the first oil spraying openings correspond to a plurality of bearings in the bearing set, so that the oil liquid can be sprayed to the corresponding bearings from the first oil spraying openings to form corresponding bearing lubricating oil ways. According to the electric drive assembly, a cooling lubricating oil way in the electric drive assembly can be simplified.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric drive assemblies, and particularly to an electric drive assembly and a vehicle. Background Art

[0002] An electric drive assembly integrates a drive motor and a reducer of an electric vehicle and is the power source for vehicle driving. When the electric drive assembly operates, more heat is generated due to the current passing through the copper wire of the drive motor, which causes the temperature of the drive motor to rise. As the motor temperature increases, the winding resistance increases accordingly, and the generated heat loss also becomes larger, resulting in lower working efficiency and further leading to a decline in the power performance of the entire vehicle. Therefore, the heat dissipation performance of the drive motor has a direct impact on the power performance of the entire vehicle.

[0003] The stator and the rotor are the main heat sources during the operation of the drive motor. Currently, the commonly used cooling methods for drive motors include water cooling and oil cooling, etc. The water cooling method can only dissipate heat indirectly through the heat transfer between the drive motor housing and the stator and rotor, while the oil cooling method, due to its reliable electrical insulation performance, can directly contact the stator and rotor and cool the stator and rotor, thus having a higher cooling efficiency. Moreover, the oil cooling method can also lubricate the components in the electric drive assembly.

[0004] In order to achieve the cooling of the stator and rotor and the lubrication of the components in the electric drive assembly, most of the cooling and lubrication systems in oil-cooled electric drive assemblies are relatively complex, which limits the improvement of the power density of the electric drive assembly and also increases the overall flow resistance of the cooling lubricating oil circuit. Summary of the Invention

[0005] In view of this, the embodiments of the present disclosure provide an electric drive assembly and a vehicle, which can simplify the cooling lubricating oil circuit in the electric drive assembly. The technical solution is as follows:

[0006] In a first aspect, an electric drive assembly is provided. The electric drive assembly includes a motor assembly, a reducer shaft and gear assembly, and a cooling lubricating oil circuit;

[0007] The motor assembly is in transmission connection with the reducer shaft and gear assembly, and both the motor assembly and the reducer shaft and gear assembly are provided with a supporting bearing group;

[0008] The cooling lubricating oil circuit includes an oil pumping assembly, a main oil circuit, branch oil circuits, spray oil pipes, and a plurality of bearing lubricating oil circuits. The oil pumping assembly is used to pump oil for the main oil circuit. The branch oil circuits and the spray oil pipes are both communicated with the main oil circuit. The bearing lubricating oil circuits correspond to the bearings in the bearing group one by one;

[0009] Among them, the branch oil circuit is used to output oil to the motor assembly. The fuel injection pipe has a plurality of first fuel injection ports, and the plurality of first fuel injection ports correspond to the plurality of bearings in the bearing group, so that the oil can be sprayed from the first fuel injection port onto the corresponding bearing to form the corresponding bearing lubricating oil circuit.

[0010] In a possible implementation, the electric drive assembly further includes an engine oil cooler, the engine oil cooler has an oil inlet and an oil outlet, the oil inlet is communicated with the main oil circuit, and the oil outlet is communicated with the branch oil circuit, so that the oil in the main oil circuit can enter the branch oil circuit via the engine oil cooler and be cooled.

[0011] In a possible implementation, the motor assembly includes a rotating shaft, a rotor, a stator, and a stator winding. The rotating shaft is in transmission connection with the input shaft of the speed reducer shaft and gear assembly. The rotor is sleeved on the outer periphery of the rotating shaft. The stator is arranged around the axis of the rotor and surrounds the rotor. The stator winding is wound on the inner side of the stator.

[0012] The branch oil circuit includes a first sub-oil circuit and a second sub-oil circuit. The first sub-oil circuit is communicated with 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 communicated with the main oil circuit and is used to output oil to the stator.

[0013] In a possible implementation, the electric drive assembly further includes an engine oil cooler, the engine oil cooler has an oil inlet and an oil outlet, and the oil outlet includes a first oil outlet and a second oil outlet.

[0014] The first oil outlet is communicated with the first sub-oil circuit, so that the oil cooled by the engine oil cooler can enter the first sub-oil circuit from the first oil outlet.

[0015] The second oil outlet is communicated with the second sub-oil circuit, so that the oil cooled by the engine oil cooler can enter the second sub-oil circuit from the second oil outlet.

[0016] In a possible implementation, the fuel injection pipe is communicated with the part of the main oil circuit between the oil pumping assembly and the engine oil cooler.

[0017] In a possible implementation, the rotating shaft has a hollow oil cavity extending along its own axial direction.

[0018] The rotor has a plurality of rotor oil circuits extending along its own axial direction, and the plurality of rotor oil circuits are distributed at intervals around the axis of the rotor.

[0019] All the plurality of rotor oil circuits are communicated with the hollow oil cavity, and the first sub-oil circuit is communicated with the hollow oil cavity.

[0020] In a possible implementation, the electric drive assembly further includes two rotor end plates, the two rotor end plates are sleeved on the outer periphery of the rotating shaft, and are respectively located at two axial ends of the rotor;

[0021] The rotor end plate has a plurality of end plate oil inlet holes and a plurality of end plate oil outlet holes, the plurality of end plate oil outlet holes all penetrate through the corresponding rotor end plate along the axial direction, and the plurality of end plate oil inlet holes and the plurality of end plate oil outlet holes are all distributed at intervals around the axis of the rotor;

[0022] Each end plate oil inlet hole communicates with the hollow oil cavity, and each rotor oil passage communicates with the end plate oil inlet hole of one rotor end plate at one end and communicates with the end plate oil outlet hole of the other rotor end plate at the other end.

[0023] In a possible implementation, the cooling lubricating oil passage further includes two annular oil passages, the two annular oil passages are respectively located at two axial ends of the stator, and one of the two annular oil passages communicates with the second sub-oil passage;

[0024] The stator has a plurality of stator oil passages extending along its own axial direction, the stator oil passages are distributed at intervals around the axis of the stator, and both ends of the stator communicate with the two annular oil passages respectively.

[0025] In a possible implementation, both of the two annular oil passages have a plurality of second oil injection ports, the plurality of second oil injection ports are distributed at intervals along the corresponding annular oil passage, and the plurality of second oil injection ports all face the stator winding, so that the oil can be sprayed from the second oil injection port onto the stator winding.

[0026] In a second aspect, a vehicle is provided, and the vehicle includes the electric drive assembly according to any one of the first aspect.

[0027] In the solution shown in the present disclosure, the oil pumped by the oil pumping assembly for the main oil passage can enter the branch oil passage and the spray pipe, so that the oil can be output to the motor assembly through the branch oil passage to cool the motor assembly, and the oil is sprayed onto a plurality of bearings through the first oil injection port of the spray pipe to form a corresponding bearing lubricating oil passage, so as to lubricate the corresponding bearings.

[0028] Thus, not only the cooling of the motor assembly is realized, but also the lubrication of a plurality of bearings is realized through the setting of one spray pipe, which greatly simplifies the cooling lubricating oil passage in the electric drive assembly, is beneficial to the improvement of the power density of the electric drive assembly, and at the same time, is beneficial to reducing the overall flow resistance of the cooling lubricating oil passage. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0030] Figure 1 is a schematic structural diagram of a cooling lubricating oil path of an electric drive assembly provided by an embodiment of the present disclosure;

[0031] Figure 2 is a schematic structural diagram of a cooling lubricating oil path of an electric drive assembly from another angle provided by an embodiment of the present disclosure;

[0032] Figure 3 is a schematic structural diagram of an injection pipe provided by an embodiment of the present disclosure;

[0033] Figure 4 is a schematic cross-sectional diagram of a partial structure of an electric drive assembly provided by an embodiment of the present disclosure;

[0034] Figure 5 is a schematic structural diagram of a rotor end plate provided by an embodiment of the present disclosure;

[0035] Figure 6 is a schematic structural diagram of a stator end sealing oil ring provided by an embodiment of the present disclosure.

[0036] Description of the reference numerals

[0037] 1. Pump oil assembly; 11. Electric oil pump; 12. Pressure filter chamber; 2. Main oil circuit; 21. First sub-oil circuit; 22. Second sub-oil circuit; 221. Oil inlet circuit for the rear bearing of the rotating shaft; 222. Lubricating oil circuit for the rear bearing of the rotating shaft; 3. Fuel injection pipe; 31. First fuel injection port; 311. Lubricating oil circuit for the rear bearing of the output shaft; 312. Lubricating oil circuit for the front bearing of the differential; 313. Lubricating oil circuit for the rear bearing of the differential; 32. Mounting hole; 33. Oil inlet end; 41. Rotating shaft; 411. Hollow oil chamber; 412. Oil slinging hole of the rotating shaft; 42. Rotor; 421. Rotor oil circuit; 43. Stator; 431. Stator oil circuit; 44. Stator winding; 5. Engine 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 circuit; 70. Stator end sealing oil ring; 71. Second fuel injection port; 8. Housing; 81. Lubricating oil circuit for the front bearing of the input shaft; 82. Lubricating oil circuit for the front bearing of the output shaft; 83. Intermediate oil circuit for bearings; 84. Lubricating oil circuit for the rear bearing of the input shaft; 9. Input shaft; 91. Input shaft oil pipe; 911. Input shaft oil circuit; 92. Rotor inlet oil pipe; 921. Rotor inlet oil circuit. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the present disclosure clearer, the following will further describe the implementation manners of the present disclosure in detail with reference to the accompanying drawings.

[0039] This embodiment relates to an electric drive assembly, which is integrated by a drive motor and a speed reducer of an electric vehicle. Thus, the electric drive assembly includes a motor assembly, a speed reducer shaft and gear assembly, and a housing for mounting the motor assembly and the speed reducer shaft and gear assembly. Moreover, both the motor assembly and the speed reducer shaft and gear assembly can be mounted inside the housing through bearings of corresponding bearing groups. For example, the housing may include a speed reducer housing, a main housing 8 and a motor rear cover connected in sequence, and the speed reducer housing, the main housing 8 and the motor rear cover can be fixed in a bolt connection manner, so that the motor assembly and the speed reducer shaft and gear assembly can be stably mounted inside the cavity formed by enclosing the speed reducer housing, the main housing 8 and the motor rear cover.

[0040] Among them, the speed reducer shaft and 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 is in transmission connection with the motor assembly through the input shaft gear. An output shaft gear may be fixedly mounted on the output shaft and is in meshing transmission connection with the input shaft 9 through the output shaft gear and the input shaft gear. The differential may have differential half shaft gears and is in meshing transmission connection with the output shaft through the differential half shaft gears of the differential and the input shaft gear.

[0041] Moreover, the bearing set 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. Both ends of the input shaft 9 may be respectively mounted in the housing through the front input shaft bearing and the rear input shaft bearing, both ends of the output shaft may be respectively mounted in the housing through the front output shaft bearing and the rear output shaft bearing, and both ends of the differential may be respectively mounted in the housing through the front differential bearing and the rear differential bearing.

[0042] To achieve the cooling and lubrication of the motor assembly and the reducer shaft and gear assembly, correspondingly, the electric drive assembly further includes a cooling and lubricating oil circuit. Refer to Figure 1 which shows a schematic structural diagram of the cooling and lubricating oil circuit of the electric drive assembly. Figure 2 which shows a schematic structural diagram of the cooling and lubricating oil circuit of the electric drive assembly from another angle. The cooling and lubricating oil circuit includes an oil pumping assembly 1, a main oil circuit 2, a branch oil circuit, an oil injection pipe 3, and a plurality of bearing lubricating oil circuits. Among them, both the main oil circuit 2 and the branch oil circuit can be formed by enclosing pipes, or can be in the form of holes, grooves, etc. provided on the housing or components, as long as a definite oil flow path can be formed. In this embodiment, both the main oil circuit 2 and the branch oil circuit can be integrated in the reducer housing, the main housing 8, and the motor rear cover, thereby avoiding complex pipeline components and being beneficial to improving the power density of the electric drive assembly.

[0043] Continue to refer to Figure 1 and Figure 2 which shows that the oil pumping assembly 1 is used to pump engine oil into the main oil circuit 2. The oil pumping assembly 1 may include an electric oil pump 11 and a pressure filter chamber 12 as shown in Figure 1 which shows. The electric oil pump 11 can pump the oil at the bottom of the housing into the pressure filter chamber 12, and after filtering the impurities in the oil through the pressure filter chamber 12, it is transported into the main oil circuit 2. Both the branch oil circuit and the oil injection pipe 3 are communicated with the main oil circuit 2. The bearing lubricating oil circuits correspond to the bearings in the bearing set one by one and are used to achieve the lubrication of the corresponding bearings.

[0044] Among them, 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 the plurality of bearings in the bearing set, so that the oil can be sprayed from the first oil injection ports 31 onto the corresponding bearings to form corresponding bearing lubricating oil circuits.

[0045] For example Figure 3 which shows a schematic structural diagram of the oil injection pipe 3. The oil injection pipe 3 has an oil inlet end 33. The oil injection pipe 3 can be communicated with the main oil circuit 2 through the oil inlet end 33. And, in Figure 3 the number of the first oil injection ports 31 of the oil injection pipe 3 can be five, but the number of the first oil injection ports 31 of the oil injection pipe 3 can also be four, three, two, etc.

[0046] In this embodiment, asFigure 3 Take the number of the first fuel injection ports 31 of the fuel injection pipe 3 shown as five for example. Among them, three first fuel injection ports 31 can respectively correspond to the rear bearing of the output shaft, the front bearing of the differential, and the rear bearing of the differential one by one. These three first fuel injection ports 31 can spray the oil entering the fuel injection pipe 3 to the rear bearing of the output shaft, the front bearing of the differential, and the rear bearing of the differential respectively, so as to form a lubricating oil path 311 for the rear bearing of the output shaft, a lubricating oil path 312 for the front bearing of the differential, and a lubricating oil path 313 for the rear bearing of the differential. At the same time, the other two first fuel injection ports 31 can spray to the meshing part between the input shaft gear and the output shaft gear and the differential half shaft gear respectively, so as to realize the lubrication of the input shaft gear, the output shaft gear, and the differential half shaft gear.

[0047] Specifically, the number and orientation of the first fuel injection ports 31 can be adjusted according to the installation positions of the bearings and the gears of the reducer shaft and gear assembly in the electric drive assembly, as long as the oil can be sprayed to the parts that need to be lubricated in the electric drive assembly.

[0048] As can be seen from the above, the oil pumped by the oil pumping assembly 1 for the main oil path 2 can enter the branch oil path and the fuel injection pipe 3. Therefore, the oil can be output to the motor assembly through the branch oil path to realize the cooling of the motor assembly, and the oil can be sprayed to multiple bearings through the first fuel injection ports 31 of the fuel injection pipe 3 to form corresponding bearing lubricating oil paths, so as to realize the lubrication of the corresponding bearings. At the same time, the oil can also be sprayed to the gears of the reducer shaft and gear assembly through the first fuel injection ports 31 to realize the lubrication of the corresponding gears.

[0049] Thus, not only the cooling of the motor assembly is realized, but also the lubrication of multiple bearings and gears is realized through the setting of one fuel injection pipe 3. This not only greatly simplifies the cooling and lubricating oil path in the electric drive assembly, is beneficial to the improvement of the power density of the electric drive assembly, but also is beneficial to reducing the overall flow resistance of the cooling and lubricating oil path.

[0050] In one example, since the oil circulates inside the housing of the electric drive assembly and cools the motor assembly through the branch oil path, therefore, after the oil completes the cooling of the motor assembly and falls back to the bottom of the housing, it may have a relatively high temperature, which may lead to the oil pumped back to the main oil path 2 by the oil pumping assembly 1 may have a relatively high temperature.

[0051] Correspondingly, continue to refer to Figure 1 and Figure 2 As shown, the electric drive assembly further includes an engine oil cooler 5. The engine oil cooler 5 has an oil inlet 51 and an oil outlet. The oil inlet 51 is communicated with the main oil path 2, and the oil outlet is communicated with the branch oil path, so that the oil in the main oil path 2 can pass through the engine oil cooler 5 and be cooled and then enter the branch oil path.

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

[0053] Thus, the engine oil cooler 5 can cool the oil before the oil re-enters the branch oil circuit, which is beneficial to improving the cooling efficiency of the motor assembly.

[0054] In one example, as Figure 4 shown in the schematic cross-sectional view of a partial structure of the electric drive assembly, the motor assembly includes a rotating shaft 41, a rotor 42, a stator 43, and a stator winding 44. The rotating shaft 41 is drivingly connected to the input shaft 9 of the reducer shaft gear assembly. For example, one end of the rotating shaft 41 can be an external spline structure, and one end of the input shaft 9 has an internal spline structure. One end of the rotating shaft 41 and the input shaft 9 can be connected through the cooperation of the external spline structure and the internal spline structure, and the other end can be installed on the motor rear cover through the rear bearing of the rotating shaft.

[0055] Continuing to refer to Figure 4 shown, the rotor 42 is sleeved on the outer periphery of the rotating shaft 41, the stator 43 is arranged around the axis of the rotor 42 and surrounds 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 axial ends of the stator 43.

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

[0057] Continuing to refer to Figure 1 and Figure 2 shown, 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. Thus, through the first sub-oil circuit 21 and the second sub-oil circuit 22, oil can be output to the rotating shaft 41, the rotor 42, the stator 43, and the stator winding 44 respectively and cooled separately, so that a relatively high cooling efficiency can be achieved.

[0058] In one example, continuing to refer to Figure 1 and Figure 2As shown, the electric drive assembly further includes an engine oil cooler 5. The engine oil cooler 5 has an oil inlet 51 and an oil outlet. The oil outlet includes a first oil outlet 52 and a second oil outlet 53. Among them, the first oil outlet 52 is communicated with the first sub-oil passage 21, so that the oil cooled by the engine oil cooler 5 can enter the first sub-oil passage 21 from the first oil outlet 52. The second oil outlet 53 is communicated with the second sub-oil passage 22, so that the oil cooled by the engine oil cooler 5 can enter the second sub-oil passage 22 from the second oil outlet 53.

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

[0060] In one example, continue to refer to Figure 1 As shown, the fuel injection pipe 3 is communicated with the part of the main oil passage 2 between the fuel pump assembly 1 and the engine oil cooler 5.

[0061] Thus, since the fuel injection pipe 3 is communicated between the engine oil cooler 5 and the fuel pump assembly 1, the oil entering the fuel injection pipe 3 still has a relatively high temperature. Therefore, the oil ejected from the first fuel injection port 31 still has a relatively high pressure, so that it can be avoided that the oil cannot fully enter the corresponding bearing lubricating oil passage to lubricate the corresponding bearing.

[0062] In one example, refer to Figure 4 As shown, 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 are spaced apart around the axis of the rotor 42.

[0063] Among them, the plurality of rotor oil passages 421 are all communicated with the hollow oil cavity 411. For example, sub-oil passages respectively communicated with the rotor oil passages 421 and the hollow oil cavity 411 are provided in the rotor 42 to realize the communication between the hollow oil cavity 231 and the rotor oil passages 221; or sub-oil passages are provided in other components in the motor assembly to make the hollow oil cavity 231 and the rotor oil passages 221 communicate.

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

[0065] As described above, the oil can enter the hollow oil cavity 411 and the rotor oil passage 421 from the first sub-oil passage 21 successively through the rotor inlet oil passage 921 and the input shaft oil pipe 91 to cool the rotating shaft 41 and the rotor 42. Thus, by providing the hollow oil cavity 411 in the rotating shaft 41 and the rotor oil passage 421 in the rotor 42, on the one hand, the space occupied by arranging additional oil pipelines is saved, which is beneficial to improving the space utilization rate of the internal space of the electric drive assembly and making the structure of the electric drive assembly more compact. On the other hand, it can have a higher cooling efficiency for the rotating shaft 41 and the rotor 42.

[0066] In one example, a plurality of rotor oil passages 421 are evenly distributed at intervals around the axis of the rotor 42, so that the cooling uniformity of the rotor 42 can be improved.

[0067] In one example, as Figure 5 shown is a schematic structural diagram of the rotor end plate 6, and in combination with Figure 4 shown, the electric drive assembly further 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 respectively located at the two axial ends of the rotor 42. For example, the middle part of the rotor end plate 6 may have an end mounting hole 63, and the rotor end plate 6 may be fixedly sleeved on the outer periphery of the rotating shaft 41 through the end mounting hole 63.

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

[0069] For example, both of the two rotor end plates 6 may each have a plurality of end plate oil inlet grooves 611, the rotating shaft 41 may have a plurality of rotating shaft oil slinging holes 412, and the rotating shaft oil slinging holes 412 are in one-to-one correspondence with the end plate oil inlet grooves 611 and the end plate oil inlet holes 61 of the two rotor end plates 6 respectively. Both ends of the end plate oil inlet groove 611 may be respectively communicated with the corresponding end mounting holes 63 and the end plate oil inlet holes 61, so that when the rotor end plate 6 is assembled on the rotating shaft 41, both ends of the rotating shaft oil slinging holes 412 may be respectively communicated with the corresponding end plate oil inlet grooves 611 and the hollow oil cavity 411.

[0070] Moreover, each rotor oil passage 421 is communicated with the end plate oil inlet hole 61 of one rotor end plate 6 at one end and the end plate oil outlet hole 62 of the other rotor end plate 6 at the other end.

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

[0072] Thus, on the one hand, the uniformity of cooling the rotor 42 can be improved. On the other hand, the oil flowing out from the end plate oil outlet hole 62 can also be slung to the inner side of the stator winding 44 to cool the stator winding 44, and then fall to the bottom of the housing and wait to be pumped again by the electric oil pump 11.

[0073] In one example, with continued reference to Figure 4 and in combination with Figure 1 and Figure 2 as shown, the cooling lubricating oil passage further includes two annular oil passages 7, the two annular oil passages 7 are respectively located at the axial two ends of the stator 43, and one of the two annular oil passages 7 is communicated with the second sub-oil passage 22.

[0074] For example, the motor assembly may further include two stator end sealing oil rings 70. As Figure 6 shown in the structural schematic diagram of the stator end sealing oil ring 70, the two stator end sealing oil rings 70 may be respectively located at the axial two ends of the stator 41, and the two stator end sealing oil rings 70 may respectively enclose with the inner wall of the main housing 8 and the end face of the stator 43, so as to form two annular oil passages 7. And one end of the second sub-oil passage 22 may extend into the interior of the main housing 8 and be communicated with one annular oil passage 7.

[0075] Wherein, the stator 43 has a plurality of stator oil passages 431 extending along its own axis, the stator oil passages 431 are spaced apart around the axis of the stator 43, and both ends of the stator 43 are respectively communicated with the two annular oil passages 7.

[0076] As described above, the oil can enter the first annular oil passage 7, the stator oil passage 431, and the second annular oil passage 7 in sequence from the second sub-oil passage 22 to cool the stator 41. Thus, by providing the stator oil passage 431 in the stator 43 and providing the annular oil passages 7 at both axial ends of the stator 43, on the one hand, the space occupied by the additional arrangement of oil pipelines is saved, which is beneficial to improving the space utilization rate of the internal space of the electric drive assembly and making the structure of the electric drive assembly more compact. On the other hand, a higher cooling efficiency for the stator 43 can be achieved.

[0077] In one example, both of the two annular oil passages 7 have a plurality of second oil injection ports 71. The plurality of second oil injection ports 71 are spaced along the corresponding annular oil passage 7, and the plurality of second oil injection ports 71 all face the stator winding 44, so that the oil can be sprayed from the second oil injection ports 71 onto the stator winding 44.

[0078] For example Figure 4 As shown, two stator end sealing oil rings 70 can respectively surround the peripheries of the parts of the stator winding 44 extending from both axial ends of the stator 41. The plurality of second oil injection ports 71 can be spaced along the stator end sealing oil ring 70 as Figure 6 shown, so that the second oil injection ports 71 all face the stator winding 44 located inside the stator end sealing oil ring 70.

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

[0080] At the same time, since both the inner and outer sides of the stator winding 44 can be cooled by the oil, 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. Thus, 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. As a result, the cooling effects of the oil sprayed from the second oil injection ports 71 of the two second annular oil passages 7 on the stator winding 44 are consistent, and further, the uniformity of the cooling of the stator winding 44 can be improved.

[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. Wherein, the first position is the position where the oil sprayed from the second oil injection port 71 of the second annular oil passage 7 lands on the stator winding 44 and falls within the main housing 8, the second position is the position where the oil sprayed from the second oil injection port 71 of the first annular oil passage 7 lands on the stator winding 44 and falls within the main housing 8, and the third position is the position where the oil pumping assembly 1 extracts oil from within the housing.

[0083] In this way, since the oil flow rate at the first position is greater than that at the second position, and when the distance between the first position and the third position is less than the distance between the second position and the third position, more oil has a shorter oil return path. Thus, the oil return speed of the oil can be increased, making the oil circuit circulation faster, which is beneficial to reducing the oil filling amount and lowering the cost.

[0084] In one example, the main oil circuit 2 can be located on the main housing 8. The injection oil pipe 3 and the main housing 8 can both have corresponding mounting holes 32. A rod-shaped fixing member such as a bolt or a screw can pass through the mounting hole 32 of the injection oil pipe 3 and be screwed into the mounting hole 32 of the main housing 8 to achieve the mounting of the injection oil pipe 3 on the main housing 8, so that the oil inlet end 33 of the injection oil pipe 3 can be communicated with the main oil circuit 2.

[0085] In one example, the cooling lubricating oil circuit can further include a rear bearing oil inlet oil circuit 221 for the rotating shaft. One end of the rear bearing oil inlet oil circuit 221 for the rotating shaft is communicated with the second sub-oil circuit 22, and the other end extends to the rear bearing of the rotating shaft. Thus, the oil in the main oil circuit 2 can be transported to the rear bearing of the rotating shaft to form a lubricating oil circuit 222 for the rear bearing of the rotating shaft, realizing the lubrication of the rear bearing of the rotating shaft.

[0086] In one example, the first sub-oil circuit 21 can further extend to the front bearing of the input shaft. Thus, the oil in the main oil circuit 2 can be transported to the front bearing of the input shaft to form a lubricating oil circuit 81 for the front bearing of the input shaft, realizing the lubrication of the front bearing of the input shaft.

[0087] In one example, the cooling lubricating oil circuit further includes an intermediate bearing oil circuit 83. Both ends of the intermediate bearing oil circuit 83 can extend to the front bearing of the input shaft and the front bearing of the output shaft respectively. Thus, the oil in the lubricating oil circuit 81 for the front bearing of the input shaft can be transported to the front bearing of the output shaft to form a lubricating oil circuit 82 for the front bearing of the output shaft, realizing the lubrication of the front bearing of the input shaft.

[0088] In one example, the cooling lubricating oil circuit can further include a third sub-oil circuit 23. The third sub-oil circuit 23 can be communicated with the main oil circuit 2 and can extend to the rear bearing of the input shaft. Thus, the oil in the main oil circuit 2 can be transported to the rear bearing of the input shaft to form a lubricating oil circuit 84 for the rear bearing of the input shaft, realizing the lubrication of the rear bearing of the input shaft.

[0089] In the embodiment of the present disclosure, the oil energy of the pump oil assembly 1 pumping oil for the main oil circuit 2 can enter the branch oil circuit and the injection oil pipe 3. Thus, the oil can be output to the motor assembly through the branch oil circuit to realize the cooling of the motor assembly, and the oil can be sprayed onto multiple bearings through the first injection port 31 of the injection oil pipe 3 to form corresponding bearing lubricating oil circuits, realizing the lubrication of the corresponding bearings. At the same time, the oil can also be sprayed onto the gears of the reducer shaft and gear assembly through the first injection port 31 to realize the lubrication of the corresponding gears.

[0090] Thus, not only the cooling of the motor assembly is achieved, but also the lubrication of multiple bearings and gears is realized through the provision of a single oil injection pipe 3. This not only greatly simplifies the cooling and lubricating oil circuit in the electric drive assembly, which is beneficial to the improvement of the power density of the electric drive assembly, but also helps to reduce the overall flow resistance of the cooling and lubricating oil circuit.

[0091] This embodiment also provides a vehicle, which includes the electric drive assembly as described in any one of the first aspects.

[0092] In the embodiment of the present disclosure, the hydraulic energy of the oil pumped by the oil pumping assembly 1 into the main oil path 2 can enter the branch oil path and the oil injection pipe 3. Therefore, the oil can be output to the motor assembly through the branch oil path to achieve the cooling of the motor assembly, and the oil can be sprayed onto multiple bearings through the first oil injection port 31 of the oil injection pipe 3 to form a corresponding bearing lubricating oil path, thereby realizing the lubrication of the corresponding bearings. At the same time, the oil can also be sprayed onto the gears of the reducer shaft and gear assembly through the first oil injection port 31 to realize the lubrication of the corresponding gears.

[0093] Thus, not only the cooling of the motor assembly is achieved, but also the lubrication of multiple bearings and gears is realized through the provision of a single oil injection pipe 3. This not only greatly simplifies the cooling and lubricating oil circuit in the electric drive assembly, which is beneficial to the improvement of the power density of the electric drive assembly, but also helps to reduce the overall flow resistance of the cooling and lubricating oil circuit.

[0094] The above are only the preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. An electric drive assembly, characterized in that: The electric drive assembly includes a motor assembly, a reducer shaft gear assembly and a cooling and lubricating oil circuit; The motor assembly is drivingly connected to the reducer shaft-gear assembly, and both the motor assembly and the reducer shaft-gear assembly have matching bearing groups; The cooling lubricating oil circuit comprises an oil pump assembly (1), a main oil circuit (2), a branch oil circuit, an oil injection pipe (3) and a plurality of bearing lubricating oil circuits, the oil pump assembly (1) being used to pump oil to the main oil circuit (2), the branch oil circuit and the oil injection pipe (3) being both connected to the main oil circuit (2), and the bearing lubricating oil circuits corresponding one to one to the bearings in the bearing group; The branch oil circuit is used to output oil to the motor assembly, and the oil injection pipe (3) has a plurality of first oil injection ports (31), and the plurality of first oil injection ports (31) correspond to the plurality of bearings in the bearing group, so that oil can be sprayed from the first oil injection ports (31) onto the corresponding bearings to form the corresponding bearing lubricating oil circuit.

2. The electric drive assembly according to claim 1, characterized in that: The electric drive assembly further comprises an oil cooler (5), the oil cooler (5) having an oil inlet (51) and an oil outlet, the oil inlet (51) being in communication with the main oil circuit (2), and the oil outlet being in communication with the branch oil circuit, so that the oil in the main oil circuit (2) can enter the branch oil circuit after being cooled by the oil cooler (5).

3. The electric drive assembly according to claim 1, characterized in that: The motor assembly comprises a rotating shaft (41), a rotor (42), a stator (43) and a stator winding (44); the rotating shaft (41) is drivingly connected to the input shaft (9) of the reducer shaft-tooth assembly; the rotor (42) is sleeved on the outer periphery of the rotating shaft (41); the stator (43) is arranged around the axis of the rotor (42) and on the outer periphery of the rotor (42); and the stator winding (44) is wound on the inner side of the stator (43); The branch oil circuit comprises 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, characterized in that: The electric drive assembly further comprises an oil cooler (5), wherein the oil cooler (5) comprises an oil inlet (51) and an oil outlet, wherein the oil outlet comprises a first oil outlet (52) and a second oil outlet (53); The first oil outlet (52) is in communication with the first sub-oil passage (21), so that the oil cooled by the engine oil cooler (5) can enter the first sub-oil passage (21) from the first oil outlet (52); The second oil outlet (53) is in communication with the second sub-oil passage (22), so that the oil cooled by the engine 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, characterized in that: The oil injection pipe (3) is in communication with a portion of the main oil circuit (2) located between the oil pump assembly (1) and the oil cooler (5).

6. The electric drive assembly according to claim 3, characterized in that: The rotating shaft (41) has a hollow oil chamber (411) extending along its axial direction; The rotor (42) has a plurality of rotor oil passages (421) extending along its axial direction, and the plurality of rotor oil passages (421) are distributed at intervals around the axis of the rotor (42); The plurality of rotor oil passages (421) are all in communication with the hollow oil chamber (411), and the first sub-oil passage (21) is in communication with the hollow oil chamber (411).

7. The electric drive assembly according to claim 6, characterized in that: The electric drive assembly further comprises two rotor end plates (6), the two rotor end plates (6) being sleeved on the outer periphery of the rotating shaft (41) and respectively located at two axial ends of the rotor (42); The rotor end plate (6) has a plurality of end plate oil inlet holes (61) and a plurality of end plate oil outlet holes (62), the plurality of end plate oil outlet holes (62) all penetrate the corresponding rotor end plate (6) in the axial direction, and the plurality of end plate oil inlet holes (61) and the plurality of 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 in communication with the hollow oil chamber (411), and each of the rotor oil passages (421) is in communication with the end plate oil inlet hole (61) of one of the rotor end plates (6) at one end, and is in communication with the end plate oil outlet hole (62) of another of the rotor end plates (6) at the other end.

8. The electric drive assembly according to claim 3, characterized in that: The cooling lubricating oil circuit further comprises two annular oil circuits (7), the two annular oil circuits (7) are respectively located at two axial ends of the stator (43), 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 the two annular oil passages (7).

9. The electric drive assembly according to claim 8, characterized in that: The two annular oil passages (7) each have a plurality of second oil injection ports (71), the plurality of second oil injection ports (71) being distributed at intervals along the corresponding annular oil passage (7), and the plurality of second oil injection ports (71) are all directed 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, characterized in that: The vehicle comprises the electric drive assembly as claimed in any one of claims 1 to 9.

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