Electric drive lubricating and cooling system and vehicle

Abstract

The invention discloses an electric drive lubricating and cooling system and a vehicle. The electrically-driven lubricating and cooling system comprises a shell assembly, a controller, a motor, a speed reducer, an oil pump and an oil cooler, the shell assembly is provided with a motor installation cavity, a controller installation cavity, a water cooling cavity, a speed reducer installation cavity and an oil storage cavity, the speed reducer installation cavity and the oil storage cavity are communicated, and a plurality of oil channels and a plurality of water channels are arranged in the box wall of the shell assembly. The oil pump, the oil cooler, the stator mounting cavity and the speed reducer mounting cavity are sequentially communicated through oil ducts to form an electric drive lubricating and cooling loop; the oil cooler communicates with the water cooling cavity through a water channel. And the stator core and the stator winding are immersed in the circulating oil liquid for heat dissipation, so that the cooling efficiency is high. Lubricating oil and cooling liquid for cooling the controller circulate in the box wall of the shell assembly, an oil pipe and a water pipe do not need to be additionally arranged in the whole electrically-driven lubricating and cooling system, and the structure of the electrically-driven lubricating and cooling system is more compact.

Description

Technical Field

[0001] The present application belongs to the technical field of electric drive systems, and in particular, relates to an electric drive lubrication and cooling system and a vehicle. Background Art

[0002] In current electric drive systems, the cooling method for motors is generally water cooling or air cooling. The water cooling solution generally sets a cooling water jacket on the outside of the stator or sets a cooling water channel on the inner wall of the motor housing to cool the stator through heat exchange with the air. Air cooling also cools the stator through heat exchange with the air. The cooling efficiency of these two cooling methods is relatively low.

[0003] In addition, the water cooling solution requires the use of a cooling water jacket, which will significantly increase the size of the motor, resulting in a larger electric drive system. Therefore, a more efficient and compact electric drive lubrication cooling system is needed. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an electric drive lubrication and cooling system and a vehicle, wherein the reducer and the stator of the motor are actively lubricated and cooled by oil, with high cooling efficiency and compact overall structure.

[0005] In a first aspect of the present application, there is provided an electric drive lubrication and cooling system, comprising:

[0006] The housing assembly is provided with a motor installation cavity, a controller installation cavity, a water cooling cavity, and a connected reducer installation cavity and an oil storage cavity, and a plurality of oil channels and a plurality of water channels are provided in the box wall of the housing assembly;

[0007] A controller, located in the controller installation cavity and heat-exchanging with the water-cooling cavity;

[0008] A motor is located in the motor installation cavity, wherein the stator assembly of the motor comprises a stator housing, and the stator winding and the stator core of the stator assembly are both located in the stator installation cavity of the stator housing;

[0009] A reducer, located in the reducer installation cavity and assembled with the rotor of the motor;

[0010] The oil pump and the oil cooler are respectively installed at different positions of the housing assembly;

[0011] Among them, the oil pump, the oil cooler, the stator mounting cavity and the reducer mounting cavity are connected in sequence through the oil channel to form an electric drive lubrication cooling circuit; the oil cooler is connected to the water cooling cavity through the water channel.

[0012] In some embodiments, the motors are two axial flux motors arranged side by side along the axial direction, and both of the two axial flux motors are electrically connected to the controller.

[0013] In some embodiments, the reducer is two planetary gears, and the two planetary gears are symmetrically distributed on the outsides of the two axial flux motors.

[0014] In some embodiments, the planetary gear shaft of the planetary gear row is provided with a connected oil guide cavity and an oil guide hole; the planetary gear of the planetary gear row is mounted on the planetary gear shaft through a second bearing, and the second bearing corresponds to the position of the oil guide hole.

[0015] In some embodiments, the reducer is provided with an oil collecting pan, which is connected to the planetary carrier of the planetary gear; the oil collecting pan is provided with oil outlet nozzles having the same number as the planetary gear axles, and the oil outlet nozzles extend into the corresponding oil guide chambers to connect the oil guide chambers and the oil collecting chamber of the oil collecting pan.

[0016] In some embodiments, the oil passage includes a first oil passage and a second oil passage, the oil pump is connected to the oil storage chamber through the first oil passage, and the oil collecting chamber is connected to the second oil passage.

[0017] In some embodiments, a first bearing is provided between the planetary gearbox and the reduction gearbox; the oil passage also includes a third oil passage, a fourth oil passage, a fifth oil passage and a sixth oil passage, and the third oil passage is connected to the installation space of the first bearing; the oil cooler is connected to the oil pump through the fourth oil passage.

[0018] In some embodiments, the stator housing is provided with an oil inlet hole and an oil outlet hole connected to the stator mounting cavity, the oil cooler is connected to the oil inlet hole through the fifth oil passage, and the oil outlet hole is connected to both the second oil passage and the third oil passage through the sixth oil passage.

[0019] In some embodiments, the housing assembly includes a motor housing, a reduction gearbox and a controller housing, the reduction gearbox includes a connected reducer housing and an end cover; the reduction gearbox is connected to the end opening of the motor housing and is close to the rotor assembly; an oil seal is provided between the reduction gearbox and the turntable of the rotor assembly.

[0020] In some embodiments, the first oil channel and the third oil channel are both disposed in the end cover, the second oil channel is disposed in the reducer housing, the fourth oil channel, the fifth oil channel and the sixth oil channel are all disposed in the motor housing; and the water channel is disposed in the motor housing.

[0021] In some embodiments, the oil storage chamber is disposed at the bottom of the reduction gearbox, an oil filter and a magnet are disposed in the wall of the reduction gearbox, and the oil filter and the magnet are both disposed in the first oil channel; the first oil channel has two openings connected to the outside, and plugs are disposed in both openings, and the oil filter and the magnet are respectively close to the two openings.

[0022] In some embodiments, the stator core includes a plurality of soft magnetic blocks distributed in a circumferential array, the stator winding includes a plurality of coil windings spaced apart and evenly distributed along the circumferential direction, and the plurality of coil windings are wound on the plurality of soft magnetic blocks in a one-to-one correspondence.

[0023] In some embodiments, a blocking member is provided in the stator housing, and the blocking member is located between the coil winding and the stator housing, so that the blocking member, the coil winding and the stator housing together form a cooling oil channel.

[0024] In some embodiments, the stator housing is annular; the coil winding is spaced apart from both the outer ring portion and the inner ring portion of the stator housing; the circumferential spacing between adjacent coil windings is connected through the spacing between the coil winding and the inner ring portion; and the blocking member is located in the spacing between the coil winding and the outer ring portion.

[0025] In some embodiments, the electrically driven lubrication and cooling system further comprises:

[0026] A resolver, mounted on the motor;

[0027] A first oil temperature detection member, provided on the oil pump or the housing assembly, for detecting the oil temperature of the oil storage chamber;

[0028] A second oil temperature detection member is provided at the oil outlet of the stator assembly and is used to detect the outlet oil temperature of the stator assembly;

[0029] Wherein, the resolver, the first oil temperature detection component and the second oil temperature detection component are all electrically connected to the controller.

[0030] In a second aspect of the present application, a vehicle is provided, comprising the above-mentioned electric drive lubrication and cooling system.

[0031] According to one or more embodiments of the present application, an electric drive lubrication and cooling system is provided, including a housing assembly, a controller, a motor, a reducer, an oil pump and an oil cooler. The housing assembly is provided with a motor mounting cavity, a controller mounting cavity, a water cooling cavity and a connected reducer mounting cavity and an oil storage cavity. A plurality of oil channels and a plurality of water channels are provided in the box wall of the housing assembly. The controller is located in the controller mounting cavity and is heat exchanged with the water cooling cavity. The motor is located in the motor mounting cavity. The stator assembly of the motor includes a stator housing. The stator winding and the stator core of the stator assembly are both located in the stator mounting cavity of the stator housing. The reducer is located in the reducer mounting cavity, and the reducer is transmission-connected to the rotor assembly of the motor. The oil pump and the oil cooler are respectively installed at different positions of the housing assembly. The oil pump, the oil cooler, the stator mounting cavity and the reducer mounting cavity are sequentially connected through the oil channel to form an electric drive lubrication and cooling circuit; the oil cooler is connected to the water cooling cavity through the water channel.

[0032] It can be seen from the above technical solution that the electric drive lubrication and cooling system provided by the present application connects the stator installation cavity and the reducer installation cavity in sequence through the oil channel, pumps the oil in the reducer installation cavity for cooling and lubricating the reducer into the stator installation cavity, and the stator winding and stator core of the stator assembly are both located in the stator installation cavity of the stator housing, and the stator core and stator winding are immersed in the circulating oil to dissipate heat. Since the stator core and stator winding are in direct contact with the circulating oil, the heat dissipation efficiency is high. When 10L / min of cooling oil is passed through the stator housing, the average temperature inside the stator can be kept at around 85°C, and the maximum temperature is less than 150°C.

[0033] In addition, the lubricating oil and the coolant for cooling the controller flow through the box wall of the housing assembly. The entire electric drive lubrication and cooling system does not require additional oil pipes and water pipes, and the electric drive lubrication and cooling system has a more compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of an electric drive lubrication and cooling system in one or more embodiments of the present application is shown.

[0036] Figure 2 Shows Figure 1 A full cutaway view of the electric drive lubrication and cooling system.

[0037] Figure 3 Shows Figure 1Schematic diagram of the assembly structure of the planetary gearbox and the reduction gearbox in the electric drive lubrication and cooling system.

[0038] Figure 4 Shows Figure 1 Schematic diagram of the structure of the oil collecting pan in the electric drive lubrication and cooling system Figure 1 .

[0039] Figure 5 Shows Figure 1 Schematic diagram of the structure of the oil collecting pan in the electric drive lubrication and cooling system Figure 2 .

[0040] Figure 6 Shows Figure 1 Full cutaway of the oil pan in the electric drive lubrication and cooling system Figure 1 .

[0041] Figure 7 Shows Figure 1 Full cutaway of the oil pan in the electric drive lubrication and cooling system Figure 2 .

[0042] Figure 8 Shows Figure 1 Schematic diagram of the oil circuit structure of the electric drive lubrication and cooling system Figure 1 .

[0043] Fig. 9 Shows Figure 1 Schematic diagram of the oil circuit structure of the electric drive lubrication and cooling system Figure 2 .

[0044] Fig.10 Shows Figure 1 Schematic diagram of the oil circuit structure of the electric drive lubrication and cooling system Figure 3 .

[0045] Fig.11 Shows Figure 1 Schematic diagram of the oil circuit structure of the electric drive lubrication and cooling system Figure 4 .

[0046] Fig.12 Shows Figure 1 Schematic diagram of the oil circuit structure of the electric drive lubrication and cooling system Figure 5 .

[0047] Fig.13 Shows Figure 1 Structural block diagram of the cooling and lubrication circuit of the electric drive lubrication and cooling system.

[0048] Fig.14 Shows Figure 1 Schematic diagram of the structure of the stator assembly of the electric drive lubrication and cooling system. In order to conveniently display the internal structure of the stator sleeve, the first rotor bearing and the second rotor bearing are hidden.

[0049] Fig.15 Shows Fig.14 Exploded view of the stator assembly.

[0050] Fig.16 Shows Fig.14 Full cross-section of the stator assembly.

[0051] Fig.17 Shows Fig.14 Schematic diagram of the structure of the housing components of the stator assembly.

[0052] Fig.18 Shows Fig.14 Schematic diagram of the assembly structure of the stator winding and stator core of the stator assembly.

[0053] Fig.19 Shows Fig.14 Schematic diagram of the structure of the flow path of the cooling oil of the stator assembly.

[0054] Fig. 20 Shows Fig.19 Schematic diagram of the structure of the cooling oil channel of the stator assembly.

[0055] Fig.21 Shows Fig.14 Schematic diagram of the connection structure of winding coils, connecting wires and blocking members in the stator winding.

[0056] Fig. 22 Shows Fig.14 Schematic diagram of the structure of the sealing insert of the stator assembly.

[0057] Fig.23 Shows Fig.14 Schematic diagram of the structure of the stator sleeve of the stator assembly.

[0058] Explanation of the reference numerals: 1000 - electric drive lubrication and cooling system; 100 - axial flux motor; 200 - housing assembly, 201 - water channel; 210 - motor housing, 210a - motor mounting cavity, 211 - mounting plate, 212 - fourth oil channel, 213 - fifth oil channel, 214 - sixth oil channel; 220 - reduction gear box, 220a - reduction gear mounting cavity; 221 - reduction gear box body, 2211 - second oil channel; 222 - end cover, 2221 - first oil channel, 2222 - third oil channel, 2223 - opening, 2224 - plug, 2225 - oil filter, 2226 - magnet; 230 - controller housing, 230a - controller mounting cavity, 230b - water cooling cavity, 231 - main body, 232 - cover plate. 300-controller; 400-reducer; 410-planetary row, 411-sun gear, 4111-input shaft, 4112-support block; 412-planet carrier, 4121-output shaft, 4122-convex edge; 413-planetary gear; 414-planetary gear shaft, 414a-oil guide chamber, 414b-oil guide hole; 415-gear ring; 420-first bearing; 430-second bearing; 440-third bearing; 450-oil collecting pan, 450a-oil collecting chamber, 451-oil outlet nozzle, 452-oil baffle plate, 453-avoidance area, 454-installation hole. 500-oil pump; 600-oil cooler; 700-rotor; 801-first oil seal; 802-second oil seal.

[0059] 100 - Axial - flux motor: 110 - Stator assembly; 111 - Stator housing, 111a - Stator mounting cavity, 111b - Oil inlet hole, 111c - Oil outlet hole, 111d - Copper - bar outlet, 111e - Cooling oil channel, 111f - Annular hole, 111g - First sealing groove, 111h - Clamping groove, 111i - Core fixing groove, 1111 - Housing sub - part, 1112 - Support block, 1113 - Inner ring part, 1114 - Outer ring part; 112 - Stator winding, 1121 - Coil winding, 1122 - Connecting wire, 11221 - Main body section, 11222 - Joint section, 1123 - Blocking part, 1124 - Three - phase copper bar; 113 - Stator core, 1131 - Soft magnetic block; 114 - Stator bushing, 1141 - Stopper step, 1142 - Shaft hole, 1143 - Ring plate, 1144 - Bushing bolt; 115a - First rotor bearing; 115b - Second rotor bearing; 116 - Sealing insert, 1161 - Insert main body, 1162 - Sealing sleeve; 117 - First seal; 118 - Second seal; 119 - Pressure plate. 120a - First rotor assembly; 120b - Second rotor assembly; 121 - Rotor shaft, 1211 - First shaft section, 1212 - Spline shaft, 1213 - Third shaft section; 122a - First turntable; 122b - Second turntable, 1221 - Internal spline; 123 - Rotor magnet, 1231 - Magnet unit; 124 - Rotor core, 1241 - Soft magnetic sheet; 125 - Rotor skeleton; 126 - Rotor bolt; 130 - Pressure ring. Detailed implementation manners

[0060] In order to enable those skilled in the art in the technical field to which the present application belongs to more clearly understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0061] In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0062] The specific technical solutions of the present application are described in detail below in conjunction with the accompanying drawings that are not necessarily drawn to scale. Among them, similar or identical reference numerals may be used to designate the same or similar parts in different figures. The use of similar or identical reference numerals in different figures does not mean that all figures including similar or identical reference numerals constitute a single or the same embodiment. The accompanying drawings generally illustrate various embodiments discussed in the present application by way of example and not limitation.

[0063] See also Figure 1 and Figure 2 In the first aspect of the present application, an electric drive lubrication and cooling system 1000 is provided, comprising a housing assembly 200, a controller 300 and at least one motor. The controller 300 is electrically connected to the motor, and on the one hand, provides three-phase current to the stator assembly of the motor, and on the other hand, communicates data with the vehicle controller 300 to control the working condition of the motor and feedback the working parameters of the motor.

[0064] The controller 300 is connected to the housing assembly 200. The controller 300 may be an independent part connected to the housing assembly 200. The controller 300 may also be installed inside the housing assembly 200. The motor is installed in the housing assembly 200, and the housing assembly 200 serves as the motor housing of the motor.

[0065] In order to meet the cooling requirements of the stator assembly 110 in the motor, in some embodiments, the electric drive lubrication and cooling system 1000 also includes an oil pump 500 and an oil cooler 600. The oil pump 500 and the oil cooler 600 are respectively installed at different positions of the housing assembly 200, and the oil pump 500, the oil cooler 600 and the stator housing 111 are respectively connected. The oil pump pumps the oil into the oil cooler 600, and the oil cooler 600 is used to cool the oil. The oil cooler 600 can cool the oil by air cooling or water cooling, which is not limited in this application. The oil inlet of the oil cooler 600 is connected to the oil pump 500, and the oil outlet of the oil cooler 600 is connected to the oil inlet hole 111b of the stator assembly 110.

[0066] In some embodiments, the electric drive lubrication cooling system 1000 further includes a reducer 400, which is connected to the motor for reducing the power output by the motor and outputting it to the outside. The reducer 400 can be an independent reducer 400 connected to the housing assembly 200. The reducer 400 can also be installed inside the housing assembly 200. The reducer 400 can adopt a planetary gear 410, a gear reduction mechanism, etc., which is not limited in this application.

[0067] The motor can be a radial motor or an axial flux motor, which is not limited in this application. In some embodiments, the motor is an axial flux motor. The electric drive lubrication cooling system 1000 can be a single motor system or a dual motor system. Figure 2In some embodiments, the electric drive lubrication cooling system 1000 adopts a dual motor system, and both motors are axial flux motors 100. The two axial flux motors 100 are arranged side by side along the axial direction. Then the electric drive lubrication cooling system 1000 includes two reducers 400, which are respectively connected to the two axial flux motors 100 for transmitting the power output by the two axial flux motors 100 to the outside after deceleration.

[0068] See also Figure 1 and Figure 2 , shows a schematic diagram and a full cross-sectional view of the structure of an electrically driven lubricating and cooling system 1000 in certain embodiments, wherein the electrically driven lubricating and cooling system 1000 is configured with two axial flux motors 100 and two single planetary gear reducers. The housing assembly 200 is provided with a controller mounting cavity 230a, a motor mounting cavity 210a and a reducer mounting cavity 220a. The controller 300 is located in the controller mounting cavity 230a, and the two axial flux motors 100 are arranged side by side in the motor mounting cavity 210a along the axial direction of the axial flux motors 100. The two planetary gears 410 are located in the reducer mounting cavity 220a and are symmetrically distributed on the outside of the two axial flux motors 100, so that the electrically driven lubricating and cooling system 1000 is generally symmetrical in structure. The two planetary gears 410 are respectively connected to the rotor assemblies of the two axial flux motors 100 in a transmission manner, and are used to output the power output by the two axial flux motors 100 to the outside after deceleration and torque increase.

[0069] In some embodiments, the housing assembly 200 includes a motor housing 210, a controller housing 230 and two reduction boxes 220, and the two reduction boxes 220 are respectively connected to the openings at both ends of the motor housing 210 and are close to the rotor assembly. The reduction box 220 and the motor housing 210 are enclosed to form a motor installation cavity 210a, the inner cavity of the controller housing 230 forms a controller installation cavity 230a, and the inner cavity of the reduction box 220 forms a reducer installation cavity 220a. Along the axial direction of the axial flux motor 100, the motor housing 210 and the two reduction boxes 220 share the same box wall, which can significantly reduce the axial size of the electric drive lubrication and cooling system 1000.

[0070] The reducer box 220 is provided with an oil storage chamber (not shown in the figure) inside, which is communicated with the reducer installation chamber 220a, and the oil dripped by the components installed in the reducer installation chamber 220a is gathered in the oil storage chamber. The oil storage chamber can be formed by the bottom part of the reducer installation chamber 220a, or it can be an oil pan additionally arranged at the bottom of the reducer installation chamber 220a, and this application does not limit it.

[0071] In some embodiments, the motor housing 210 and the main body 231 of the controller housing 230 are an integrated structure, that is, one of the chambers of the motor housing 210 is used as the motor installation chamber 210a, and the other chamber is used as the controller installation chamber 230a. The cover plate 232 of the controller housing 230 is connected to the motor housing 210 to seal the controller installation chamber 230a. The integration of the motor housing 210 and the controller housing 230 can significantly reduce the size of the electric drive lubrication cooling system 1000 in a direction perpendicular to the axial direction.

[0072] In order to further reduce the axial size of the electric drive lubrication cooling system 1000 and improve the power density of the electric drive lubrication cooling system 1000, please refer to Figure 2 In some embodiments, a spline groove 1214 is provided in the rotor shaft 121 of the axial flux motor 100, and an input shaft 4111 is provided in the sun gear 411 of the planetary row 410, and the input shaft 4111 is key-connected with the spline groove 1214. The torque output by the rotor shaft 121 is transmitted to the planetary row 410 through the sun gear 411. In some embodiments, the first shaft section 1211 of the rotor shaft 121 is hollow inside, and a spline groove 1214 is provided on the inner wall thereof.

[0073] Since the spline fitting of the input shaft 4111 and the rotor shaft 121 is not visible, the input shaft 4111 and the rotor shaft 121 can only be assembled blindly. To avoid interference between the two during assembly, please refer to Figure 2 In some embodiments, a shoulder is provided on the inner wall of the rotor shaft 121, and a support stopper 4112 is provided on the input shaft 4111. When the input shaft 4111 moves axially until the support stopper 4112 abuts against the shoulder and is axially limited, the spline groove 1214 of the rotor shaft 121 is stably engaged with the external spline of the input shaft 4111, and the end of the input shaft 4111 will not interfere with the cavity wall of the rotor shaft 121. In addition, the support stopper 4112 is slidably matched with the inner wall of the rotor shaft 121, and can also play a role in guiding and ensuring the coaxiality of the sun gear 411 and the rotor shaft 121.

[0074] Taking the electric drive lubrication cooling system 1000 configured with two axial flux motors 100 with an overall outer diameter of 310 mm as an example, the outer envelope size of the electric drive lubrication cooling system 1000 is 380*420*290 mm, of which the axial size is 420 mm and the height is 290 mm. The smaller axial size allows the electric drive lubrication cooling system 1000 to be directly installed between the two wheels along the Y direction (the width direction of the vehicle), and the torque output by the two planetary gears 410 drives the two wheels respectively.

[0075] In the planetary gear 410, the sun gear 411 and the input shaft 4111 may be an integrated structure, and the sun gear 411 and the input shaft 4111 may also be connected by a key, bolt, etc., which is not limited in the present application. In some embodiments, the input shaft 4111 and the sun gear 411 are integrally formed to form a gear shaft, and the gear shaft is a hollow shaft to reduce the weight of the gear shaft, and the hollow shaft can also allow lubricating oil to enter, thereby lubricating the meshing portion between the spline groove 1214 of the rotor shaft 121 and the external spline of the input shaft 4111, and the matching portion between the support stop 4112 of the input shaft 4111 and the inner wall of the rotor shaft 121.

[0076] To prevent oil leakage, several oil seals are provided at the connection between the planetary gear 410 and the reduction gearbox 220. Figure 2 and Figure 3 In some embodiments, the sun gear 411 of the planetary gear row 410 is provided with an input shaft 4111, the planetary carrier 412 of the planetary gear row 410 is provided with an output shaft 4121, and a first bearing 420 is provided between the output shaft 4121 and the reduction box 220. In other words, the planetary gear row 410 adopts a structural form in which the sun gear 411 is input and the planetary carrier 412 is output. Accordingly, a first oil seal 801 is provided between the input shaft 4111 and the reduction box 220. A second oil seal 802 is provided between the output shaft 4121 and the reduction box 220, and the second oil seal 802 is located on the outside of the first bearing 420. In order to prevent lubricating oil from entering the motor installation cavity 210a, a first oil seal 801 is provided between the reduction box 220 and the rotating disk of the rotor assembly close to it. In some embodiments, the reduction gearbox 220 includes a reduction gear housing 221 and an end cover 222 connected to each other, the first oil seal 801 is installed between the reduction gear housing 221 and the input shaft 4111 , and the second oil seal 802 is installed between the end cover 222 and the output shaft 4121 .

[0077] See also Figure 2 In some embodiments, two axial flux motors 100 are arranged side by side in the axial direction with the second rotor assemblies 120b close to each other, the stators of the two resolvers 700 are respectively connected to the motor housing 210, and the rotors of the two resolvers 700 are respectively connected to the two second rotating disks 122b. Specifically, a mounting plate 211 is provided inside the motor housing 210, and the stators of the two resolvers 700 are symmetrically mounted on both sides of the mounting plate 211 by bolts. The second rotating disks 122b of the two axial flux motors 100 are both provided with a second mounting portion 1223, and the rotors of the resolvers 700 are sleeved on the second mounting portion 1223 in the form of interference fit. The first rotating disks 122a of the two axial flux motors 100 are both provided with a first mounting portion 1222, and the first mounting portion 1222 is an annular protrusion. The reduction box 220 is sleeved on the first mounting portion 1222, and the first oil seal 801 is installed between the reduction box 220 and the first mounting portion 1222.

[0078] See also Figure 2 In some embodiments, the reduction box 220 includes a reduction box body 221 and an end cover 222 connected to each other, the reduction box body 221 is connected to the motor housing 210, and an oil seal is installed between the reduction box body 221 and the first mounting portion 1222. The planetary carrier 412 of the planetary row 410 is provided with an output shaft 4121, and a first bearing 420 is provided between the output shaft 4121 and the end cover 222. To prevent leakage of lubricating oil, a second oil seal 802 is provided between the output shaft 4121 and the end cover 222.

[0079] In the related art, the gearbox part of the distributed dual-motor electric drive lubrication and cooling system mostly adopts the passive lubrication and cooling method of gear oil stirring, which leads to large oil stirring loss and low efficiency. However, compared with the parallel shaft gear reduction mechanism, the planetary gear 410 has a more compact structure, and the ring gear 415 is not easy to stir the oil, so the oil stirring lubrication method cannot well meet the lubrication requirements of the planetary gear 410. For this reason, the electric drive lubrication and cooling system 1000 provided in the present application actively sprays oil to lubricate the planetary gear 410 by setting an oil collecting pan 450.

[0080] See also Figure 2 and Figure 3 In some embodiments, the planet carrier 412 is provided with an oil collecting pan 450, which is annular and sleeved at one end of the planet carrier 412 away from the output shaft 4121, and rotates together with the planet carrier 412. The oil collecting pan 450 is provided with the same number of oil outlet nozzles 451 as the number of the planetary gear shafts 414 of the planetary row 410, and the lubricating oil is input into the oil collecting pan 450, and the lubricating oil can flow out through each oil outlet nozzle 451 to each planetary gear 413 and the corresponding bearing.

[0081] See also Figure 4 and Figure 5 , shows a schematic diagram of the structure of an oil collecting pan 450 in some embodiments, wherein a plurality of oil baffles 452 are provided in the oil collecting pan 450, the number of the oil baffles 452 being the same as the number of the oil outlet nozzles 451, and the root position of each oil baffle 452 is respectively close to the corresponding oil outlet nozzle 451. By providing the oil baffles 452, the oil can be gathered at the root of the oil baffles 452 in the rotating oil collecting pan 450, so that the oil can enter the oil outlet nozzle 451.

[0082] See also Figure 6 In some embodiments, the oil baffle plate 452 is arranged to be inclined relative to the radial direction of the oil collecting pan 450. Along the rotation direction of the oil collecting pan 450, the root of the oil baffle plate 452 is located in front of the corresponding oil outlet nozzle 451, and the free end of the oil baffle plate 452 is located behind the corresponding oil outlet nozzle 451. Figure 6 When the oil pan 450 rotates in the direction indicated by the middle arrow, the oil will rotate relative to the oil pan 450 due to inertia. It can be understood that the oil pan 450 and the oil are both rotating along the Figure 6 When rotating in the direction indicated by the middle arrow, the rotation speed of the oil collecting pan 450 is faster than the oil, and the oil will gradually gather at the root of the oil baffle plate 452, flow along the oil baffle plate 452 to the free end of the oil baffle plate 452, and finally enter the oil outlet nozzle 451.

[0083] See also Figure 7 In some embodiments, the oil collecting pan 450 is mounted on the planetary carrier 412 by screws. In order to facilitate the installation of the screws, a plurality of avoidance areas 453 are provided on the side panel of the oil collecting pan 450 on the side away from the oil outlet nozzle 451, and a plurality of mounting holes 454 are provided on the side panel of the oil collecting pan 450 on the side where the oil outlet nozzle 451 is located. Each avoidance area 453 corresponds to each mounting hole 454 one by one. During installation, a sleeve can be set in the avoidance area 453, and the screws can be installed through the internal space of the sleeve to prevent the screws from accidentally falling into the oil collecting chamber 450a.

[0084] The lubricating oil can be input into the oil collecting pan 450 through an externally arranged oil pipe, or the lubricating oil can be transported by opening an oil passage in the box wall of the housing assembly 200. Furthermore, the cooling oil of the stator assembly 110 of the axial flux motor 100 can be mixed with the lubricating oil of the planetary gear 410, that is, the oil first enters the stator assembly 110 to cool the stator assembly 110, and then is transported to the oil collecting pan 450 through the oil passage 220c opened in the box wall of the housing assembly 200. The oil lubricates the planetary gear 410 and finally falls into the reducer installation cavity 220a. The oil pump 500 is connected to the reducer installation cavity 220a, and the oil falling into the reducer installation cavity 220a is pumped to the stator assembly 110.

[0085] The planetary gear shaft 414 of the planetary gear row 410 is provided with a connected oil guide cavity 414a and an oil guide hole 414b; the planetary gear 413 of the planetary gear row 410 is mounted on the planetary gear shaft 414 through a second bearing 430, and the second bearing 430 corresponds to the position of the oil guide hole 414b. The oil collecting plate 450 is connected to the planetary carrier 412 of the planetary gear row 410; the oil collecting plate 450 is provided with the same number of oil outlet nozzles 451 as the planetary gear shaft 414, and the oil outlet nozzles 451 extend into the corresponding oil guide cavity 414a to connect the oil guide cavity 414a and the oil collecting cavity 450a of the oil collecting plate 450.

[0086] See also Figures 8 to 12 The oil passages opened in the box wall of the housing assembly 200 include a first oil passage 2221 and a second oil passage 2211. The oil pump 500 is connected to the oil storage chamber through the first oil passage 2221, and the oil collecting chamber 450a of the oil collecting pan 450 is connected to the second oil passage 2211. Figures 8 to 12The oil passages opened in the casing wall of the housing assembly 200 further include a third oil passage 2222, a fourth oil passage 212, a fifth oil passage 213 and a sixth oil passage 214. The third oil passage 2222 is communicated with the installation space of the first bearing 420; the oil cooler 600 is communicated with the oil pump 500 through the fourth oil passage 212. The oil cooler 600 is communicated with the oil inlet hole 111b of the stator casing 111 through the fifth oil passage 213, and the oil outlet hole 111c of the stator casing 111 is communicated with both the second oil passage 2211 and the third oil passage 2222 through the sixth oil passage 214.

[0087] In some embodiments, the housing assembly 200 includes a motor housing 210, a reduction box 220, and a controller housing 230. The reduction box 220 includes a connected reducer housing 221 and an end cover 222. The reduction box 220 is connected to the end opening of the motor housing 210 and is close to the first rotor assembly 120a. The first oil passage 2221 and the third oil passage 2222 are both provided in the end cover 222, the second oil passage 2211 is provided in the reducer housing 221, the fourth oil passage 212 and the sixth oil passage 214 are both provided in the motor housing 210 and the reducer housing 221, and the fifth oil passage 213 is provided in the motor housing 210.

[0088] See also Figure 8 The oil storage chamber is arranged at the bottom of the reduction box 220, and an oil filter 2225 and a magnet 2226 are arranged in the wall of the reduction box 220, and the oil filter 2225 and the magnet 2226 are arranged in the first oil passage 2221; the first oil passage 2221 has two openings 2223 communicating with the outside, and plugs 2224 are arranged in the two openings 2223, and the oil filter 2225 and the magnet 2226 are respectively close to the two openings 2223. After the electric drive lubrication cooling system 1000 has been running for a period of time, the oil filter 2225 and the magnet 2226 need to be cleaned or replaced, and the corresponding opening 2223 can be opened through the plug 2224, and the oil filter 2225 or the magnet 2226 in the opening 2223 can be removed for cleaning or replacement.

[0089] See also Figure 1 In some embodiments, the housing assembly 200 is further provided with a water cooling chamber 230b, and a plurality of water channels 201 are provided in the box wall of the housing assembly 200, and the oil cooler 600 is connected with the water cooling chamber 230b through the water channels 201. The controller 300 is located in the controller installation chamber 230a and is heat exchanged with the water cooling chamber 230b. Specifically, the water cooling chamber 230b is provided on the controller housing 230, and can be a chamber provided inside the controller housing 230, or a groove provided inside the controller housing 230 is sealed by a cover plate to form the water cooling chamber 230b. The inlet and outlet of the water channel 201 are provided on the motor housing 210, and the water channel 201 is mainly provided in the box wall of the motor housing 210.

[0090] See also Fig.14 , Fig.15 and Fig.16 In some embodiments, the stator assembly 110 of the axial flux motor 100 includes a stator housing 111 having a stator mounting cavity 111a, and a stator winding 112 and a stator core 113 located in the stator mounting cavity 111a, and the stator winding 112 is wound on the stator core 113. The stator housing 111 is provided with an oil inlet hole 111b, an oil outlet hole 111c and a copper bar outlet 111d connected to the stator mounting cavity 111a, and the three-phase copper bar 1124 of the stator winding 112 extends outward through the copper bar outlet 111d. Cooling oil is circulated into the stator mounting cavity 111a through the oil inlet hole 111b and the oil outlet hole 111c, and the stator winding 112 and the stator core 113 are immersed in the circulating oil to dissipate heat.

[0091] The stator winding 112 and the stator core 113 may both be of an integral structure. For example, the stator core 113 is annular, and the stator winding 112 is wound on the annular stator core 113. In some embodiments, the stator winding 112 and the stator core 113 are both of a split structure. Fig.18 The stator core 113 includes a plurality of soft magnetic blocks 1131 distributed in a circumferential array, and the plurality of soft magnetic blocks 1131 are evenly and spacedly distributed along the circumferential direction. It is understood that the material of the stator core 113 is not limited to soft magnetic materials. Fig.18 and Fig.19 The stator winding 112 includes a plurality of coil windings 1121 spaced and evenly distributed along the circumferential direction and a connecting wire 1122 for connecting the windings. The plurality of coil windings 1121 are wound on the plurality of soft magnetic blocks 1131 in a one-to-one correspondence.

[0092] See also Fig.18 and Fig.19 , a plurality of blocking members 1123 are provided in the stator housing 111, and the blocking members 1123 are located between the coil winding 1121 and the stator housing 111, and the blocking members 1123 are distributed at intervals along the circumferential direction between the coil winding 1121 and the stator housing 111, so that the blocking members 1123, the coil winding 1121 and the stator housing 111 are surrounded to form a cooling oil channel 111e, and the oil flows into the cooling oil channel 111e from the oil inlet hole 111b, soaking the stator core 113 and the stator winding 112 in the stator installation cavity 111a, and the oil flows out from the oil outlet hole 111c after heat exchange with the stator core 113 and the stator winding 112. In order to avoid interference with the magnetic field, the blocking members 1123 are made of non-magnetic conductive materials, such as non-metals such as plastic, carbon fiber, rubber, ceramics, or non-magnetic conductive metals.

[0093] The stator housing 111 is annular, and its annular hole 111f is used for the rotor shaft 121 to pass through and install the rotor bearing. The two housing parts 1111 are connected and fixed by bolts on the outer ring part 1114 of the stator housing 111. To ensure the structural strength of the outer ring part 1114, the wall thickness of the outer ring part 1114 is 15mm to 25mm. The coil winding 1121 is spaced from the outer ring part 1114 and the inner ring part 1113 of the stator housing 111. The circumferential spacing between adjacent coil windings 1121 is connected through the spacing between the coil winding 1121 and the inner ring part 1113. Please refer to Figure 4 In some embodiments, a plurality of support blocks 1112 are provided on the inner ring portion 1113 of the stator housing 111 , and the shape of the end surface of the support block 1112 matches the end shape of the coil winding 1121 . The support block 1112 abuts against the corresponding end of the coil winding 1121 to limit the radial position of the coil winding 1121 .

[0094] In some embodiments, the number of support blocks 1112 is less than the number of coil windings 1121, so that the circumferential intervals between adjacent coil windings 1121 are connected through the area between the coil windings 1121 and the inner ring portion 1113 where no support blocks 1112 are provided. As an implementation scheme, a support block 1112 may be provided for every other coil winding 1121. By providing the support blocks 1112, on the one hand, the coil windings 1121 can be supported radially, and on the other hand, the oil can be prevented from forming a circulation along the interval between the coil windings 1121 and the inner ring portion 1113, forcing the oil to enter the circumferential intervals between adjacent coil windings 1121.

[0095] In some embodiments, the interval between the coil winding 1121 and the outer ring portion 1114 of the stator housing 111 is larger than the interval between the coil winding 1121 and the inner ring portion 1113 of the stator housing 111. In this case, the oil will mainly flow in the interval between the coil winding 1121 and the outer ring portion 1114, and it is difficult for the oil to actively enter the circumferential interval between adjacent coil windings 1121 and the interval between the coil winding 1121 and the inner ring portion 1113. By arranging the blocking member 1123 in the interval between the coil winding 1121 and the outer ring portion 1114, and staggering the blocking member 1123 with the circumferential interval between adjacent coil windings 1121, the oil is forced to flow to the circumferential interval between adjacent coil windings 1121 and the interval between the coil winding 1121 and the inner ring portion 1113, thereby forming Fig. 20 The S-shaped circulation cooling circuit shown has a larger heat dissipation area and a better cooling effect. When 10L / min of cooling oil flows inside the stator housing, the average temperature inside the stator can be maintained at around 85°C, and the maximum temperature is less than 150°C.

[0096] The blocking member 1123 is used not only to block the oil from flowing along the annular gap between the coil winding 1121 and the stator housing 111, but also to assist in fixing the connecting wire 1122. Fig.21 In some embodiments, the connection line 1122 passes through the blocking member 1123, and the connection line 1122 is fixed by the blocking member 1123. Fig.21 In some embodiments, the coil winding 1121 and the connecting wire 1122 are both flat wires. To facilitate the connection between the connecting wire 1122, the blocking member 1123 and the coil winding 1121, in some embodiments, the connecting wire 1122 includes a main section 11221 and a joint section 11222. The main section 11221 is straight or arc-shaped and passes through the blocking member 1123. The joint section 11222 is welded to the coil winding 1121, and the joint section 11222 is usually in a bent structure.

[0097] In order to facilitate the installation of the three-phase copper bar 1124 and adapt to the thermal expansion and contraction of the three-phase copper bar 1124, the size of the copper bar outlet 111d must be larger than the size of the three-phase copper bar 1124, so there will be a slight gap between the copper bar outlet 111d and the three-phase copper bar 1124, forming a leakage point. Since the gap is too small, it is difficult to seal with conventional seals and can only be sealed with glue. However, the oil has a certain pressure, and the temperature of the oil is high, so the durability of the sealant is difficult to adapt to the environment where the three-phase copper bar 1124 is installed.

[0098] To solve the above problems, please refer to Fig.15 and Fig.19 In some embodiments, a sealing insert 116 is provided in the stator housing 111, and the sealing insert 116 is coated on the three-phase copper bar 1124 and embedded in the copper bar outlet 111d. The sealing insert 116 is made of an elastic material (such as rubber, silicone, etc.), which can be elastically deformed under pressure, so that the slight gap between the stator housing 111 and the three-phase copper bar 1124 can be sealed, so that the sealing reliability of the stator assembly 110 is higher.

[0099] To facilitate the installation of the stator core 113 and the stator winding 112, the stator housing 111 adopts a split structure. Fig.15 and Fig.16In some embodiments, the stator housing 111 includes two housing components 1111, and the two housing components 1111 together form a stator mounting cavity 111a. The oil inlet 111b, the oil outlet 111c and the copper drain port 111d can be respectively arranged on different housing components 1111, or can be formed by the two housing components 1111. The structures of the two housing components 1111 can be the same, which is equivalent to dividing the housing component 1111 in half; the structures of the two housing components 1111 can also be different, for example, one of them is an annular groove body and the other is an annular cover plate. More structural forms of the housing component 1111 are not exhaustively listed here.

[0100] See also Fig.16 The two housing parts 1111 are sealed by the first seal 117, and the first seal 117 realizes the outer ring sealing of the stator housing 111. The sealing insert 116 is located on the outside of the first seal 117. The first seal 117 forms the first seal at the copper discharge outlet 111d, and the sealing insert 116 forms the second seal at the copper discharge outlet 111d. The unique sealing design ensures that the stator cooling system has a leakage pressure drop of less than the industry requirement standard of 135Pa / min under the high air pressure of 2.5bar applied inside, and has higher reliability.

[0101] The copper bar outlet 111d can be an integral opening, and the U, V, and W three-phase copper bars 1124 are all located in the copper bar outlet 111d; the copper bar outlet 111d can also be three openings, and the U, V, and W three-phase copper bars 1124 are respectively located in the three openings. Fig.17 The copper outlet 111d is provided on one of the housing parts 1111, and the copper outlet 111d includes three openings. The other housing part 1111 is provided with a first sealing groove 111g for assembling the first sealing member 117, and the sealing insert 116 is clamped and fixed by the two housing parts 1111. It can be understood that the sealing insert 116 is made of elastic material, such as rubber, silicone, etc., and can be made of the same material as the first sealing member 117.

[0102] See also Fig. 22 , shows a schematic diagram of the structure of the sealing insert 116 in some embodiments, the sealing insert 116 includes a connected insert body 1161 and three sealing sleeves 1162, and the three-phase copper bar 1124 is respectively interference fit with the three sealing sleeves 1162. The insert body 1161 is respectively connected to the two shell parts 1111, and can be fixed by bonding or bolting. The two shell parts 1111 are each provided with three clamping grooves 111h, and the three sealing sleeves 1162 are respectively located in the three clamping grooves 111h and are clamped and fixed by the two shell parts 1111.

[0103] See also Fig.15Considering that the sealing insert 116 is made of soft rubber, if it is directly connected with bolts, the connection is prone to cracking. To this end, in some embodiments, a pressure plate 119 is provided on the outside of the sealing insert 116. The pressure plate 119 is made of metal material or a non-metal plate with high strength, such as resin. The insert body 1161 is clamped between the pressure plate 119 and the stator housing 111. The bolts pass through the insert body 1161 and are screwed to the pressure plate 119 and the two housing components 1111, thereby clamping and fixing the insert body 1161.

[0104] In some embodiments, the stator housing 111 is a non-magnetic material and does not hinder the magnetic circuit. The non-magnetic material can be a non-magnetic non-metallic material, such as carbon fiber, phenolic resin, Teflon, etc.; or a non-magnetic metal material, such as stainless steel, aluminum alloy, titanium alloy, etc. The stator housing 111 mainly protects the internal stator core 113 and the stator winding 112. The tensile strength of the stator housing 111 is required to be above 1500MPa and the stiffness is required to be above 20000N / mm. In addition, when the stator assembly 110 is applied to an axial flux motor, in order to make the air gap between the stator and the rotor smaller, the wall thickness of the thinnest part of the stator housing 111 should not exceed 1mm. In some embodiments, the material of the stator housing 111 is carbon fiber, and the wall thickness of the thinnest part of the stator housing 111 made of carbon fiber material (at the core fixing slot 111i) is only 0.5mm to 0.7mm. The high-strength carbon fiber material makes the stator housing 111 extremely rigid and strong, and can withstand a moment of more than 600 N·m and a compression force of more than 10,000 N without being damaged.

[0105] See also Fig.15 and Fig.16 In some embodiments, based on the fact that the stator housing 111 is made of non-metallic material, in order to strengthen the structure of the stator housing 111, the stator assembly 110 further includes one or more stator bushings 114, and the stator bushings 114 are all metal bushings. The stator housing 111 is annular, and the stator bushing 114 is embedded in the annular hole 111f of the stator housing 111. The inner cavity of the stator bushing 114 forms the axial hole 1142 of the stator assembly 110. The inner cavity wall of the stator bushing 114 is provided with a stop step 1141, and one end of the rotor bearing is axially limited by the stop step 1141 of the stator bushing 114, such as Fig.16 shown.

[0106] In some embodiments, the two stator bushings 114 are respectively interference-fitted with the two housing sub-components 1111, so that no leakage occurs between the stator bushings 114 and the corresponding housing sub-components 1111. The two stator bushings 114 are sealed by the second seal 118, and a sealing groove may be provided on any one of the two stator bushings 114, or sealing grooves may be provided on the opposite end surfaces of the two stator bushings 114, and the second seal 118 is embedded in the sealing groove and deformed by clamping the two stator bushings 114.

[0107] The clamping force between the two stator bushings 114 can be provided by the bolts connecting the two housing parts 1111. Considering that the bolts connecting the two housing parts 1111 are distributed on the outer periphery of the stator housing 111, and the two stator bushings 114 are both located in the annular holes 111f of the stator housing 111, the restraining force received is limited. For this purpose, please refer to Fig.23 In some embodiments, the two stator bushings 114 are fixedly connected by bushing bolts 1144, and ring plates 1143 may be provided in both stator bushings 114 for connecting the bushing bolts 1144. The two stator bushings 114 are locked by the bushing bolts 1144 to clamp the second seal 118 together, so as to achieve the inner ring sealing of the stator housing 111.

[0108] It is understandable that in some embodiments, the stator housing 111 is a non-magnetic metal material with a certain strength, and the stator housing 111 is annular as a whole, and the inner ring hole of the stator housing 111 forms an axial hole. A stop step is provided on the hole wall of the inner ring hole of the metal stator housing 111 to limit the axial position of the bearing. The inner rings of the two housing parts 1111 of the metal stator housing 111 are sealed by the second sealing member 118 to achieve the inner ring sealing of the stator housing 111.

[0109] In order to limit the tangential movement of the stator core 113, see Fig.17 In some embodiments, the stator housing 111 is provided with a plurality of core fixing slots 111i communicating with the stator mounting cavity 111a, the ends of the stator core 113 are embedded in the core fixing slots 111i and pressed against the stator housing 111, and the stator housing 111 limits the stator core 113 in the axial, tangential and radial directions. It can be understood that the axial dimension of the stator core 113 is larger than the stator winding 112, so that at least one end of the stator core 113 is exposed relative to the stator winding 112, and the exposed part of the stator core 113 extends into the core fixing slots 111i. The area between the core fixing slots 111i presses against the stator winding 112, that is, the slot walls of the core fixing slots 111i are in contact with the coil winding 1121, and the stator housing 111 and the stator core 113 jointly limit the stator winding 112 in the axial, tangential and radial directions.

[0110] In some embodiments, the core fixing groove 111i is formed by a concave area in the stator housing 111. The core fixing groove 111i is located at least on the axial inner wall of the stator housing 111 on the side close to the rotor of the axial flux motor. It can not only limit the stator core 113, but also reduce the thickness of the barrier between the rotor magnet and the stator core 113 in the axial flux motor, thereby reducing the influence of the stator housing 111 on the magnetic circuit.

[0111] The number, shape and distribution of the core fixing slots 111i are the same as those of the soft magnetic blocks 1131. The core fixing slots 111i and the soft magnetic blocks 1131 can be fitted by interference fit or clearance fit. To further fix the soft magnetic blocks 1131, glue can be applied to the core fixing slots 111i, and each soft magnetic block 1131 can be glued and fixed to the stator housing 111 by glue.

[0112] In certain embodiments, the electric drive lubrication cooling system 1000 further includes two oil temperature detection components, namely: a first oil temperature detection component, mounted on the oil pump 500 or the housing assembly 200, for detecting the oil temperature of the oil storage chamber; and a second oil temperature detection component, disposed at the oil outlet hole 111c of the stator assembly 110, for detecting the outlet oil temperature of the stator assembly 110. The rotary transformer 700, the first oil temperature detection component and the second oil temperature detection component are all electrically connected to the controller. As an implementation scheme, the first oil temperature detection component is integrated in the PCB circuit board of the electronic oil pump, for monitoring the oil temperature T0 of the oil storage chamber, and the second oil temperature detection component is disposed at the oil outlet hole 111c of the stator assembly 110, for monitoring the oil temperature T1 after the stator is cooled.

[0113] According to different working conditions of the electric drive lubrication and cooling system 1000, the controller 300 estimates the motor power according to the thermal model, estimates the heat generated by the stator assembly 110, and further estimates the stator outlet oil temperature T2 in combination with the oil temperature T0 at the oil pump 500. The difference between the oil temperature T1 monitored by the sensor and the estimated oil temperature T2 after stator cooling is input into the controller 300 in a closed loop. According to the established electric drive thermal model, the speed of the oil pump 500 is changed in real time, and the flow of lubricating oil entering the stator assembly 110 and the inner cavity of the reduction box 220 is adjusted to realize the system cooling and lubrication function.

[0114] In addition, in some embodiments, an oil level of a certain height H can be set in the reducer installation cavity 220a of the reduction box 220, and the height of the oil suction port of the oil pump 500 is set to be higher than the lowest point of the oil storage cavity of the reduction box 220, that is, the height difference between the height of the oil suction port of the oil pump 500 and the lowest point of the oil storage cavity of the reduction box 220 is H. When the temperature of the stator assembly 110 is low and no lubricating oil is needed for cooling, in order to reduce the power loss of the oil pump 500, when the oil suction port of the oil pump 500 is lower than the lowest oil level in the inner cavity of the reduction box 220 (at this time, the oil pump cannot suck oil smoothly or cannot suck oil), the oil pump 500 is controlled to stop. At this time, the several gears and bearings in the reduction box 220 drive the lubricating oil in their inner cavities to splash lubricate through the planetary gears 413 and the planetary carrier 412 to ensure the normal operation of the planetary row 410.

[0115] The second aspect of the present application provides a vehicle, which includes an electric drive lubrication cooling system according to any one of the first aspects. The vehicle may be a pure electric vehicle or a hybrid vehicle, which is not limited by the present application.

[0116] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0117] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0118] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0119] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0120] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0121] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0122] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0123] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electric drive lubrication and cooling system, characterized in that: include: The housing assembly is provided with a motor installation cavity, a controller installation cavity, a water cooling cavity, and a connected reducer installation cavity and an oil storage cavity, and a plurality of oil channels and a plurality of water channels are provided in the box wall of the housing assembly; A controller, located in the controller installation cavity and heat-exchanging with the water-cooling cavity; A motor is located in the motor installation cavity, wherein the stator assembly of the motor comprises a stator housing, and the stator winding and stator core of the stator assembly are both located in the stator installation cavity of the stator housing; A reducer, located in the reducer installation cavity and assembled with the rotor of the motor; The oil pump and the oil cooler are respectively installed at different positions of the housing assembly; Among them, the oil pump, the oil cooler, the stator mounting cavity and the reducer mounting cavity are connected in sequence through the oil channel to form an electric drive lubrication cooling circuit; the oil cooler is connected to the water cooling cavity through the water channel.

2. The electric drive lubrication and cooling system according to claim 1, characterized in that: The motors are two axial flux motors arranged side by side in the axial direction, and both of the two axial flux motors are electrically connected to the controller; The reducer comprises two planetary gears, and the two planetary gears are symmetrically distributed on the outsides of the two axial flux motors.

3. The electric drive lubrication and cooling system according to claim 2, characterized in that: The planetary gear shaft of the planetary gear row is provided with a connected oil guide cavity and an oil guide hole; the planetary gear of the planetary gear row is mounted on the planetary gear shaft through a second bearing, and the second bearing corresponds to the position of the oil guide hole; The reducer is provided with an oil collecting pan, which is connected to the planet carrier of the planetary gear; the oil collecting pan is provided with oil outlet nozzles having the same number as the planetary gear shafts, and the oil outlet nozzles extend into the corresponding oil guide chambers to connect the oil guide chambers and the oil collecting chambers of the oil collecting pan; The oil passage includes a first oil passage and a second oil passage. The oil pump is communicated with the oil storage chamber through the first oil passage, and the oil collecting chamber is communicated with the second oil passage.

4. The electric drive lubrication and cooling system according to claim 3, characterized in that: A first bearing is provided between the planetary row and the reduction box; the oil passage further comprises a third oil passage, a fourth oil passage, a fifth oil passage and a sixth oil passage, the third oil passage is communicated with the installation space of the first bearing; the oil cooler is communicated with the oil pump through the fourth oil passage; The stator housing is provided with an oil inlet and an oil outlet communicating with the stator mounting cavity, the oil cooler is communicated with the oil inlet through the fifth oil passage, and the oil outlet is communicated with both the second oil passage and the third oil passage through the sixth oil passage.

5. The electric drive lubrication and cooling system according to claim 4, characterized in that: The housing assembly includes a motor housing, a reduction box and a controller housing, the reduction box includes a connected reducer housing and an end cover; the reduction box is connected to the end opening of the motor housing and is close to the rotor assembly; an oil seal is provided between the reduction box and the rotating disk of the rotor assembly; The first oil passage and the third oil passage are both arranged in the end cover, the second oil passage is arranged in the reducer housing, the fourth oil passage, the fifth oil passage and the sixth oil passage are all arranged in the motor housing; the water passage is arranged in the motor housing.

6. The electric drive lubrication and cooling system according to claim 5, characterized in that: The oil storage chamber is arranged at the bottom of the reduction box, and an oil filter and a magnet are arranged in the box wall of the reduction box. The oil filter and the magnet are both arranged in the first oil channel; the first oil channel has two openings connected to the outside, and plugs are arranged in the two openings. The oil filter and the magnet are respectively close to the two openings.

7. The electric drive lubrication and cooling system according to any one of claims 1 to 6, characterized in that: The stator core includes a plurality of soft magnetic blocks distributed in a circumferential array, the stator winding includes a plurality of coil windings spaced and evenly distributed along the circumferential direction, and the plurality of coil windings are wound on the plurality of soft magnetic blocks in a one-to-one correspondence; A blocking member is provided in the stator housing, and the blocking member is located between the coil winding and the stator housing, so that the blocking member, the coil winding and the stator housing are surrounded to form a cooling oil channel.

8. The electric drive lubrication and cooling system according to claim 7, characterized in that: The stator housing is annular; the coil winding is spaced apart from both the outer ring portion and the inner ring portion of the stator housing; the circumferential spacing between adjacent coil windings is connected via the spacing between the coil winding and the inner ring portion; and the blocking member is located in the spacing between the coil winding and the outer ring portion.

9. The electric drive lubrication and cooling system according to any one of claims 1 to 6, characterized in that: Also includes: A resolver, mounted on the motor; A first oil temperature detection member, provided on the oil pump or the housing assembly, for detecting the oil temperature of the oil storage chamber; A second oil temperature detection member is provided at the oil outlet of the stator assembly and is used to detect the outlet oil temperature of the stator assembly; Wherein, the resolver, the first oil temperature detection component and the second oil temperature detection component are all electrically connected to the controller.

10. A vehicle, characterized in that: The invention comprises the electric drive lubrication and cooling system according to any one of claims 1 to 9.

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