An electric machine, powertrain, and vehicle

Abstract

The embodiment of the present application provides a motor, a power assembly and a vehicle. The motor comprises: a shell assembly, a cooling cavity for cooling oil flow being arranged in the shell assembly, the shell assembly being provided with an oil inlet and an oil outlet communicating with the cooling cavity; a stator assembly, at least part of the stator assembly being arranged in the cooling cavity, so that the stator assembly can be at least partially immersed in the cooling oil; and a rotor assembly, rotatably sleeved on the inner side of the stator assembly. In the scheme, at least part of the stator assembly can be immersed in the cooling oil in the cooling cavity and directly contact with the cooling oil, so that the contact type oil cooling is realized. In this way, the cooling oil can be in full contact with the stator assembly under the hydraulic action as much as possible, so that the stator assembly and the cooling oil can have a relatively large contact area, the heat dissipation area of the stator assembly is improved, and the flowing cooling oil can timely take away the heat of the stator assembly, so that the heat dissipation efficiency of the motor can be greatly improved compared with the oil shower type cooling scheme.

Description

TECHNICAL FIELD

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

[0002] With the increasing requirement of power performance of electric vehicles, the torque density and power density of the power assembly, as one of the core components of the power output of the electric vehicle, also increase to realize the lightweight and miniaturization of the electric machine. The electric machine, as the core component of the power assembly, is the key to the power output of the power assembly and directly determines the power output of the power assembly and the power performance of the vehicle. The torque density and power density of the electric machine also increase, and the heat dissipation of the electric machine becomes a major problem.

[0003] The heat dissipation capacity of the electric machine is improved, which is an important scheme to improve the torque density and power density of the electric machine. Therefore, how to further improve the heat dissipation capacity of the electric machine is the direction and research focus of the technical personnel in the field. SUMMARY

[0004] The electric machine, the power assembly and the vehicle provided by the embodiments of the present application are beneficial to improve the heat dissipation efficiency of the electric machine, the torque density and power density of the power assembly also increase to realize the lightweight and miniaturization of the electric machine, and further beneficial to the lightweight and miniaturization of the vehicle.

[0005] The electric machine provided by the embodiments of the present application comprises a housing assembly, a stator assembly and a rotor assembly. The housing assembly is provided with a cooling cavity for the flow of cooling oil, and the housing assembly is provided with an oil inlet and an oil outlet communicating with the cooling cavity. The stator assembly is at least partially arranged in the cooling cavity, so that the stator assembly can be at least partially immersed in the cooling oil. The rotor assembly is rotatably sleeved on the inner side of the stator assembly.

[0006] The electric machine provided by the embodiments of the present application comprises a housing assembly, a stator assembly and a rotor assembly. The housing assembly is provided with a cooling cavity for the flow of cooling oil, and the housing assembly is provided with an oil inlet and an oil outlet communicating with the cooling cavity. The stator assembly is at least partially arranged in the cooling cavity, so that the stator assembly can be at least partially immersed in the cooling oil. The rotor assembly is rotatably sleeved on the inner side of the stator assembly.

[0007] In an exemplary embodiment, the stator assembly comprises a stator core located at least partially in the cooling cavity, and a stator coil located in the cooling cavity and fixed to the stator core.

[0008] In an exemplary embodiment, the stator core is provided with an oil inlet flow channel located inside the stator core, and an oil inlet hole is formed in an axial first end of the stator core, an inlet of the oil inlet hole penetrates an end face of the axial first end of the stator core to communicate with the oil inlet, and an outlet of the oil inlet hole communicates with the oil inlet flow channel; and / or the stator core is provided with an oil outlet flow channel located inside the stator core, and an oil outlet hole is formed in an axial second end of the stator core, an inlet of the oil outlet hole communicates with the oil outlet flow channel, and an outlet of the oil outlet hole penetrates an end face of the axial second end of the stator core to communicate with the oil outlet.

[0009] In an exemplary embodiment, the housing assembly comprises a housing provided with the oil inlet and the oil outlet, and a partition fixed in the housing and surrounding at least part of the cooling cavity with the housing; wherein the partition comprises at least one sleeve sealingly connected with the housing.

[0010] In an exemplary embodiment, the sleeve is sealingly connected with the housing through a sealing member; the housing is provided with a first mounting groove, and the sealing member is mounted in the first mounting groove; one end of the sleeve connected with the housing is provided with two first sealing rings arranged concentrically, and a first sealing groove is formed between the two first sealing rings; the sealing member comprises a sealing body and two second sealing rings connected with the sealing body, the two second sealing rings are arranged concentrically, and a second sealing groove is formed between the two second sealing rings; one of the first sealing rings is inserted into the second sealing groove and sealingly cooperates with a groove wall of the second sealing groove, and one of the second sealing rings is inserted into the first sealing groove and sealingly cooperates with a groove wall of the first sealing groove.

[0011] In an exemplary embodiment, the housing, the partition and the stator assembly surround the cooling cavity, the number of the sleeves is two, one end of the sleeve is sealingly connected with the housing, and the other end of the sleeve is sealingly connected with an axial end of a stator core of the stator assembly.

[0012] In an exemplary embodiment, the axial end of the stator core is provided with a second mounting groove; the sleeve connected to one end of the stator core is provided with two third sealing rings arranged concentrically, a third sealing groove is formed between the two third sealing rings; one of the third sealing rings is inserted into the second mounting groove, and sealing glue is arranged in the second mounting groove and / or the third sealing groove.

[0013] In an exemplary embodiment, the housing comprises: a casing, one end of the casing is provided as an open end; and an end cover, the end cover is arranged at the open end of the casing and is fixedly connected with the casing; wherein one of the casing and the end cover is provided with the oil inlet, and the other is provided with the oil outlet.

[0014] In an exemplary embodiment, the casing is further provided with a water cooling channel, and a water inlet and a water outlet communicating with the water cooling channel, the water cooling channel is arranged around the side of the casing.

[0015] The embodiments of the present application further provide a power assembly comprising the motor of any of the above embodiments.

[0016] The embodiments of the present application further provide a vehicle comprising the motor of any of the above embodiments.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. Other advantages of the present application will be realized and attained by those of ordinary skill in the art, including studying the following description and appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide an understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0019] Figure 1 The exploded structural schematic diagram of the motor provided by an embodiment of the present application is shown in the figure;

[0020] Figure 2 The cooling principle schematic diagram of the stator assembly of the motor shown in the figure (with the rotor assembly removed) is shown in the figure; Figure 1

[0021] Figure 3 The cooling principle schematic diagram of the stator assembly of the motor shown in the figure (with the rotor assembly removed) is shown in the figure; Figure 2

[0022] Figure 4 The assembled perspective view of the motor shown in the figure is shown in the figure; Figure 1

[0023] Figure 5 ​​​An exploded view of a motor provided in another embodiment of this application;

[0024] Figure 6 for Figure 5 A cross-sectional view of the motor shown;

[0025] Figure 7 A three-dimensional structural schematic diagram of an end cap provided in one embodiment of this application;

[0026] Figure 8 for Figure 7 A schematic cross-sectional view of the end cap shown.

[0027] Figure 9 A three-dimensional structural schematic diagram of a sleeve provided in one embodiment of this application;

[0028] Figure 10 for Figure 9 A partial cross-sectional view of the sleeve shown.

[0029] Figure 11 for Figure 10 Enlarged diagram of section A in the middle;

[0030] Figure 12 A three-dimensional structural schematic diagram of a sealing element provided in one embodiment of this application;

[0031] Figure 13 for Figure 12 A cross-sectional view of the seal shown.

[0032] Figure 14 A schematic diagram of the labyrinth seal formed by the sealing element and the sleeve;

[0033] Figure 15 A schematic diagram of the labyrinth seal structure formed by the sleeve and the second stator end plate;

[0034] Figure 16 A cross-sectional view of a stator assembly provided in one embodiment of this application;

[0035] Figure 17 A partial cross-sectional view of a stator core provided in one embodiment of this application;

[0036] Figure 18 This is a schematic diagram of the main structure of a first stator end plate provided in one embodiment of this application;

[0037] Figure 19 This is an enlarged schematic diagram of section B in section 18;

[0038] Figure 20 for Figure 18 A cross-sectional view of the first stator end plate is shown.

[0039] Figure 21 Fig. 1 is a schematic view of a stator assembly according to an embodiment of the present application; Figure 20

[0040] Figure 22 Fig. 2 is a schematic view of a partial structure of an oil inlet side of a stator assembly according to an embodiment of the present application;

[0041] Figure 23 Fig. 3 is a schematic view of a partial structure of an oil outlet side of a stator assembly according to an embodiment of the present application; Figure 22

[0042] Figure 24 Fig. 4 is a schematic view of a partial structure of a stator core according to an embodiment of the present application;

[0043] Figure 25 Fig. 5 is a schematic view of a front structure of a stator core according to an embodiment of the present application;

[0044] Figure 26 Fig. 6 is a schematic view of an enlarged view of a D part in Fig. 5; Figure 25

[0045] Figure 27 Fig. 7 is a schematic view of a structure of a stator slot wedge according to an embodiment of the present application;

[0046] Figure 28 Fig. 8 is a schematic view of a cross-sectional structure of a stator slot wedge according to an embodiment of the present application; Figure 27

[0047] Figure 29 Fig. 9 is a schematic view of a side structure of a stator slot wedge according to an embodiment of the present application; Figure 27

[0048] Figure 30 Fig. 10 is a schematic view of an assembly of a stator core with a stator slot wedge according to an embodiment of the present application;

[0049] Figure 31 Fig. 11 is a schematic view of an enlarged view of an E part in Fig. 10; Figure 30

[0050] Figure 32 Fig. 12 is a schematic view of a structure of a stator slot wedge according to an embodiment of the present application;

[0051] Figure 33 Fig. 13 is a schematic view of a side structure of a stator slot wedge according to an embodiment of the present application; Figure 32

[0052] Figure 34 Fig. 14 is a schematic view of an assembly of a stator core with a stator slot wedge according to another embodiment of the present application;

[0053] Figure 35 Fig. 15 is a schematic view of an enlarged view of an F part in Fig. 14; Figure 34

[0054] ​​​​​​​​Figure 36 A three-dimensional structural schematic diagram of a stator sleeve provided in one embodiment of this application;

[0055] Figure 37 for Figure 36 A schematic cross-sectional view of the stator sleeve shown.

[0056] Figure 38 A three-dimensional structural schematic diagram of a stator sleeve provided in another embodiment of this application;

[0057] Figure 39 for Figure 38 A schematic cross-sectional view of the stator sleeve shown.

[0058] Figure 40 A three-dimensional structural schematic diagram of a stator sleeve provided in another embodiment of this application;

[0059] Figure 41 for Figure 40 A schematic cross-sectional view of the stator sleeve shown.

[0060] Figure 42 A three-dimensional structural schematic diagram of a stator sleeve provided in yet another embodiment of this application;

[0061] Figure 43 for Figure 42 A schematic cross-sectional view of the stator sleeve shown.

[0062] Figure 44 A three-dimensional structural schematic diagram of a stator sleeve provided in another embodiment of this application;

[0063] Figure 45 for Figure 44 A schematic cross-sectional view of the stator sleeve shown.

[0064] Figure 46 This is a schematic diagram of the cooling oil flow in a stator assembly provided in one embodiment of this application;

[0065] Figure 47 A schematic diagram of the cooling principle of a powertrain provided in one embodiment of this application;

[0066] Figure 48 A schematic diagram of the cooling principle of a powertrain provided for another embodiment of this application;

[0067] Figure 49 This is a schematic diagram of a vehicle provided in one embodiment of this application.

[0068] in, Figures 1 to 49 The accompanying figure labels are as follows:

[0069] 1 housing assembly, 11 housing, 111 casing, 1111 oil inlet, 1112 water cooling channel, 1113 water inlet, 1114 water outlet, 112 end cover, 1121 oil outlet, 113 first mounting groove, 12 partition, 120 sleeve, 121 first sleeve, 122 second sleeve, 123 first sealing ring, 124 first sealing groove, 125 third sealing ring, 126 third sealing groove, 13 cooling cavity, 14 sealing member, 141 sealing body, 142 second sealing ring, 143 second sealing groove, 15 sealing glue;

[0070] 2 stator assembly, 21 stator core, 211 first stator end plate, 2111 first oil inlet hole, 2112 second oil inlet hole, 2113 oil inlet flow channel, 2114 first transition flow channel, 212 second stator end plate, 2121 first oil outlet hole, 2122 second oil outlet hole, 2123 oil outlet flow channel, 213 core body, 214 stator sleeve, 2141 first cooling oil channel, 215 stator tooth slot, 2151 shoulder, 216 second mounting groove, 22 stator coil, 221 end winding, 23 stator slot wedge, 231 first notch, 232 second notch, 233 third notch, 234 second cooling oil channel;

[0071] 3 rotor assembly, 31 third cooling oil channel; 4 motor controller; 5 oil pump; 6 oil cooler; 7 water pump; 8 water cooler; 100 vehicle. DETAILED DESCRIPTION

[0072] With the increasing requirement of the power performance of electric vehicles, the torque density and power density of the power assembly, which is one of the core components of the power output of the electric vehicles, also increase to realize the lightweight and miniaturization of the motor. The motor, which is the core component of the power assembly, is the key to the power output of the power assembly, and directly determines the power output of the power assembly and the power performance of the vehicle.

[0073] And improving the heat dissipation capacity of the motor is an important scheme to improve the torque density and power density of the motor. Therefore, how to further improve the heat dissipation capacity of the motor is the direction and research focus of the technical personnel in the field.

[0074] The principles and characteristics of the present application are described below in conjunction with the drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0075] As shown in Figures 1 to 4 An embodiment of the present application provides a motor, which comprises a housing assembly 1, a stator assembly 2 and a rotor assembly 3.

[0076] The housing assembly 1 is provided with a cooling cavity 13 for the flow of cooling oil, and the housing assembly 1 is provided with an oil inlet 1111 and an oil outlet 1121 which communicate with the cooling cavity 13.

[0077] The stator assembly 2 is at least partially arranged in the cooling cavity 13, so that the stator assembly 2 can be at least partially immersed in the cooling oil.

[0078] The rotor assembly 3 is rotatably sleeved inside the stator assembly 2.

[0079] The motor provided by the embodiment of the present application comprises a housing assembly 1, a stator assembly 2 and a rotor assembly 3. The housing assembly 1 is internally provided with a cooling cavity 13, and the cooling oil can enter the cooling cavity 13 through an oil inlet 1111 of the housing assembly 1 and flow out through an oil outlet 1121 of the housing assembly 1. Since at least a part of the stator assembly 2 is located in the cooling cavity 13, at least a part of the stator assembly 2 can be immersed in the cooling oil in the cooling cavity 13 and directly contact the cooling oil, so as to realize contact oil cooling. In this way, the cooling oil can be in full contact with the stator assembly 2 under the action of hydraulic pressure, so that the stator assembly 2 and the cooling oil can have a relatively large contact area, the heat dissipation area of the stator assembly 2 is increased, and the flowing cooling oil can timely take away the heat of the stator assembly 2, so that the heat dissipation efficiency of the motor can be greatly improved compared with the oil shower cooling scheme.

[0080] In an exemplary embodiment, the stator assembly 2 comprises a stator core 21 and a stator coil 22, as shown in Figure 16 .

[0081] As shown in Figure 2 , at least a part of the stator core 21 is located in the cooling cavity 13. The stator coil 22 is located in the cooling cavity 13 and fixed to the stator core 21.

[0082] The stator assembly 2 comprises a stator core 21 and a stator coil 22. Since at least a part of the stator core 21 is located in the cooling cavity 13, at least a part of the stator core 21 can be immersed in the cooling oil. In this way, the cooling oil can directly realize contact heat conduction with the stator core 21 and timely take away the heat of the stator core 21. Moreover, the stator coil 22 is also located in the cooling cavity 13, so that the stator coil 22 can also be immersed in the cooling oil. In this way, the cooling oil can directly realize contact heat conduction with the stator coil 22 and timely take away the heat of the stator coil 22. In this way, the stator core 21 and the stator coil 22 can both realize contact heat conduction with the cooling oil, and the generated heat can be timely taken away by the flowing cooling oil, so as to ensure that the motor has a relatively high heat dissipation efficiency.

[0083] In an exemplary embodiment, as shown in Figure 2 , Figure 3 , Figure 6 , Figure 16 and Figure 17As shown, the stator core 21 is provided with an oil inlet channel 2113, a first cooling oil channel 2141, and an oil outlet channel 2123 connected in sequence. The oil inlet channel 2113 is located at the first axial end of the stator core 21 and is connected to the oil inlet 1111. The oil outlet channel 2123 is located at the second axial end of the stator core 21 and is connected to the oil outlet 1121. The first cooling oil channel 2141 is located on the side of the stator core 21.

[0084] In this way, the cooling oil entering the cooling chamber 13 through the oil inlet 1111 can enter the oil inlet channel 2113 to cool the first axial end of the stator core 21; then it enters the first cooling oil channel 2141 through the oil inlet channel 2113 to cool the side of the stator core 21; then it enters the oil outlet channel 2123 through the first cooling oil channel 2141 to cool the second axial end of the stator core 21; finally, it flows out through the oil outlet 1121. Thus, both axial ends and the side of the stator core 21 can have contact heat conduction with the cooling oil, and the generated heat can be carried away by the flowing cooling oil in a timely manner, greatly increasing the heat dissipation area of ​​the stator core 21, thereby ensuring that the stator core 21 has high heat dissipation efficiency.

[0085] The specific shape of the first cooling oil passage 2141 is not restricted.

[0086] In one example, such as Figure 17 , Figure 36 and Figure 37 As shown, the first cooling oil passage 2141 extends in a spiral shape along the circumferential and axial directions of the stator assembly 2.

[0087] exist Figure 17 , Figure 36 and Figure 37 In this design, the rotation angle of the first cooling oil channel 2141 is less than 360°, such as approximately 30°, 60°, 90°, 120°, 150°, 180°, 270°, 300°, etc. In other words, the first cooling oil channel 2141 is a spiral oil channel, but it only rotates slightly around the stator core 21 and does not rotate to form a complete circle. Therefore, the cooling oil in the first cooling oil channel 2141 still flows roughly along the axial direction of the stator core 21, that is, the first cooling oil channel 2141 is still an axial flow channel.

[0088] Of course, the rotation angle of the first cooling oil passage 2141 can also be equal to 360° or greater than 360°. In this case, the first cooling oil passage 2141 is a spiral oil passage with a large rotation amplitude, forming a complete circle structure, such as forming a spiral oil passage with three or four circles.

[0089] In one example, such as Figure 38 and Figure 39As shown, the first cooling oil channel 2141 extends along the axial direction of the stator assembly 2, and is linear, being an axial flow channel.

[0090] In the above two examples, the first cooling oil channel 2141 flows substantially along the axial direction of the motor, and the flow path is substantially equal to the axial length of the motor. Since the axial length of the motor is relatively small, the axial flow channel in this solution can shorten the oil return period.

[0091] The traditional oil shower cooling scheme is mostly radial oil path. The cooling oil is sprayed from the spray pipe, flows along the highest point of the outer circle of the stator core 21 to the lowest point of the outer circle of the stator core 21, and returns to the oil storage groove from the lowest point. The other path is to climb from the outer circle of the stator coil 22 to the lowest point of the stator coil 22 and return to the oil storage groove. Both paths are radial flow channels, and there is no cooling flow channel on the inside of the stator core 21. The flow path of the cooling oil is greater than or equal to half the circumferential dimension of the motor, and the length is relatively large. The climbing path of the cooling oil is longer than the axial flow channel, and the oil return period is longer.

[0092] In other examples, as shown in Figure 40 and Figure 41 , the first cooling oil channel 2141 includes a plurality of annular oil channels and a plurality of gap oil channels. Among them, the annular oil channel extends along the circumferential direction of the stator core 21, and is annular. A plurality of annular oil channels are arranged in the axial direction of the stator core 21. A gap oil channel is arranged between adjacent two annular oil channels, and the gap oil channel can extend along the axial direction of the stator core 21 to connect the adjacent two annular oil channels. In this way, the cooling oil on the side of the stator core 21 can also flow from the first end to the second end of the stator core 21 in the axial direction. Alternatively, the first cooling oil channel 2141 is in a mesh shape, as shown in Figure 42 and Figure 43 .

[0093] Of course, the shape of the first cooling oil channel 2141 can also be any combination of the above examples, or other shapes such as wavy, zigzag, etc.

[0094] In an exemplary embodiment, as shown in Figure 17 , the oil inlet flow channel 2113 extends along the radial direction of the stator core 21, and the radially outer end of the oil inlet flow channel 2113 is in communication with the first cooling oil channel 2141. The oil outlet flow channel 2123 extends along the radial direction of the stator core 21, and the radially outer end of the oil outlet flow channel 2123 is in communication with the first cooling oil channel 2141.

[0095] The oil inlet flow channel 2113 and the oil outlet flow channel 2123 extend along the radial direction of the stator core 21, and have a regular structure, which is convenient for processing and forming. The radial outer end of the oil inlet flow channel 2113 and the radial outer end of the oil outlet flow channel 2123 are in communication with the first cooling oil channel 2141, so that the first cooling oil channel 2141 is located at a position (radial outer portion) radially outward of the stator core 21, which is convenient for cooling the periphery of the stator core 21 and is beneficial to increasing the heat dissipation area of the stator core 21.

[0096] In an exemplary embodiment, the oil inlet flow channel 2113 is located inside the stator core 21. The axial first end portion of the stator core 21 is provided with a first oil inlet hole 2111, as shown in Figure 18 、 Figure 19 and Figure 24 . The inlet of the first oil inlet hole 2111 penetrates the end surface of the axial first end portion of the stator core 21 to communicate with the oil inlet port 1111. The outlet of the first oil inlet hole 2111 is in communication with the oil inlet flow channel 2113.

[0097] The oil outlet flow channel 2123 is located inside the stator core 21. The axial second end portion of the stator core 21 is provided with a first oil outlet hole 2121 (as shown in Figure 15 ). The inlet of the first oil outlet hole 2121 is in communication with the oil outlet flow channel 2123. The outlet of the first oil outlet hole 2121 penetrates the end surface of the axial second end portion of the stator core 21 to communicate with the oil outlet port 1121.

[0098] In this embodiment, the first oil inlet hole 2111 is arranged at the axial first end portion of the stator core 21, so that the cooling oil entering the cooling cavity 13 through the oil inlet port 1111 can enter the oil inlet flow channel 2113 of the stator core 21 through the first oil inlet hole 2111, and then enter the first cooling oil channel 2141.

[0099] The first oil outlet hole 2121 is arranged at the axial second end portion of the stator core 21, so that the cooling oil output by the first cooling oil channel 2141 can enter the first oil outlet hole 2121 through the oil outlet flow channel 2123, and then flow out of the stator core 21, and finally be discharged through the oil outlet port 1121.

[0100] In an exemplary embodiment, the axial first end portion of the stator core 21 is provided with a second oil inlet hole 2112, as shown in Figure 19 and Figure 22 . The second oil inlet hole 2112 is arranged corresponding to the radial middle portion of the stator tooth of the stator core 21, and the second oil inlet hole 2112 is in communication with the oil inlet flow channel 2113.

[0101] As shown in Figure 23As shown, the axial second end of the stator core 21 is provided with a second oil outlet hole 2122, which is arranged corresponding to the radial middle part of the stator teeth of the stator core 21, and the second oil outlet hole 2122 communicates with the oil outlet flow channel 2123.

[0102] In this way, the second oil inlet hole 2112 is opposite to the middle position of the end winding 221 of the stator coil 22 on this side, as shown. Figure 22 The end winding 221 on this side is immersed in the cooling oil, and the cooling oil flows through the middle position of the end winding 221 on this side into the second oil inlet hole 2112 to cool the inside of the end winding 221 on this side, so that the inside and outside of the end winding 221 on this side can be uniformly cooled, avoiding the uneven cooling caused by the oil shower cooling which can only cool the outside of the end winding 221 of the stator coil 22, and avoiding the existence of the heat dissipation dead zone. The cooling oil uniformly cooled on the end winding 221 on this side can flow into the first cooling flow channel through the oil inlet flow channel 2113 to ensure the flowability of the cooling oil.

[0103] The second oil outlet hole 2122 is opposite to the middle position of the end winding 221 of the stator coil 22 on this side, as shown. Figure 23 The end winding 221 on this side is immersed in the cooling oil, and the cooling oil flowing out of the second cooling oil channel 234 can flow to the second oil outlet hole 2122 through the oil outlet flow channel 2123, and then cool the inside of the end winding 221 on this side, so that the inside and outside of the end winding 221 on this side can be uniformly cooled, avoiding the uneven cooling caused by the oil shower cooling which can only cool the outside of the end winding 221 of the stator coil 22, and avoiding the existence of the heat dissipation dead zone.

[0104] In an exemplary embodiment, as shown in Figure 18 and Figure 19 The number of oil inlet flow channels 2113 is multiple, and the multiple oil inlet flow channels 2113 are arranged along the circumference of the stator core 21, for example, uniformly arranged.

[0105] The number of oil outlet flow channels 2123 is multiple, and the multiple oil outlet flow channels 2123 are arranged along the circumference of the stator core 21, for example, uniformly arranged.

[0106] The number of first cooling oil channels 2141 is multiple, and the multiple first cooling oil channels 2141 are arranged along the circumference of the stator core 21, for example, uniformly arranged, as shown in Figure 36 and Figure 37

[0107] The number of first oil inlet holes 2111 is multiple, and the multiple first oil inlet holes 2111 are arranged along the circumference of the stator core 21, for example, uniformly arranged, as shown in Figure 18 and Figure 19 ​​

[0108] The number of the second oil inlet holes 2112 is multiple, and the multiple second oil inlet holes 2112 are arranged along the circumference of the stator core 21, for example, uniformly. Figure 18 and Figure 19 as shown.

[0109] The number of the first oil outlet holes 2121 is multiple, and the multiple first oil outlet holes 2121 are arranged along the circumference of the stator core 21, for example, uniformly.

[0110] The number of the second oil outlet holes 2122 is multiple, and the multiple second oil outlet holes 2122 are arranged along the circumference of the stator core 21, for example, uniformly.

[0111] In one example, the multiple first oil inlet holes 2111 can be arranged one-to-one with the multiple oil inlet flow channels 2113 (of course, they can also not be arranged one-to-one), as shown in Figure 18 and Figure 19 The multiple first oil outlet holes 2121 can be arranged one-to-one with the multiple oil outlet flow channels 2123 (of course, they can also not be arranged one-to-one). The multiple oil inlet flow channels 2113, the multiple first cooling oil channels 2141, and the multiple oil outlet flow channels 2123 are arranged one-to-one (of course, they can also not be arranged one-to-one).

[0112] In one example, the multiple first oil inlet holes 2111 and the multiple second oil inlet holes 2112 are arranged staggered along the circumference of the stator core 21, as shown in Figure 18 and Figure 19 as shown.

[0113] In one example, the number of the second oil inlet holes 2112 is equal to the number of the stator teeth and arranged one-to-one.

[0114] The above-mentioned schemes are all conducive to the uniform distribution of the cooling oil flow, thereby improving the heat dissipation uniformity of the stator assembly 2 and avoiding the existence of heat dissipation dead zones.

[0115] In other examples, the number of the second oil inlet holes 2112 is not equal to the number of the stator teeth, for example, is half of the number of the stator teeth or is an integer multiple of the number of the stator teeth, and of course, there can be no corresponding relationship in the number. The multiple second oil inlet holes 2112 can be uniformly arranged along the circumference of the stator core 21.

[0116] In an exemplary embodiment, the axial first end of the stator core 21 is further provided with a first transition flow channel 2114 extending annularly along the circumference of the stator core 21, as shown in Figure 19 The first transition flow channel 2114 is arranged to communicate the oil inlet flow channel 2113, the first oil inlet hole 2111, and the second oil inlet hole 2112.

[0117] The axial second end of the stator core 21 is further provided with a second transition flow channel extending in a ring shape along the circumferential direction of the stator core 21, and the second transition flow channel is arranged to communicate with the oil outlet flow channel 2123, the first oil outlet hole 2121 and the second oil outlet hole 2122.

[0118] In this way, the first axial end and the second axial end of the stator core 21 have a larger heat dissipation area, and thus have a higher heat dissipation efficiency.

[0119] In an exemplary embodiment, as shown in Figure 17 The stator core 21 includes a core body 213, a first stator end plate 211, a second stator end plate 212 and a stator sleeve 214.

[0120] The first stator end plate 211 is connected to the axial first end of the core body 213, and the first stator end plate 211 forms the axial first end of the stator core 21.

[0121] The second stator end plate 212 is connected to the axial second end of the core body 213, and the second stator end plate 212 forms the axial second end of the stator core 21.

[0122] The stator sleeve 214 is sleeved outside the core body 213, and the stator sleeve 214 is provided with a first cooling oil channel 2141.

[0123] In this embodiment, the stator core 21 includes a core body 213, a first stator end plate 211, a second stator end plate 212 and a stator sleeve 214. The core body 213 can be formed by laminating stator punching sheets. The first stator end plate 211 and the second stator end plate 212 are fixed at the axial two ends of the core body 213, and form the first axial end and the second axial end of the stator core 21 respectively, and the first stator end plate 211 is provided with an oil inlet flow channel 2113, a first oil inlet hole 2111, a second oil inlet hole 2112, a first transition flow channel 2114 and the like, as shown in Figure 18 and Figure 19 The second stator end plate 212 is provided with an oil outlet flow channel 2123, a first oil outlet hole 2121, a second oil outlet hole 2122, a second transition flow channel and the like. The stator sleeve 214 is sleeved outside the core body 213 to form the outside part of the stator core 21. The stator sleeve 214 is provided with a first cooling flow channel, as shown in Figures 36 to 45 so that the first cooling flow channel is located at the outside part of the stator core 21, which is beneficial to increase the heat dissipation area of the side part of the stator core 21 and facilitate the timely dissipation of heat generated by the stator core 21.

[0124] Of course, if a flow passage hole extending in the circumferential direction of the stator sleeve 214 is formed at the center of the stator sleeve 214, a radial flow passage cooling scheme can also be changed, and the variability is high. If the first stator end plate 211 and the second stator end plate 212 are removed, the stator sleeve 214 cooperates with the length of the stator core 21, and can be converted into an oil shower scheme.

[0125] In an exemplary embodiment, the first cooling oil passage 2141 extends through the inner side wall of the stator sleeve 214 in the radial direction of the stator core 21, as shown in Figures 36 to 43 In other words, the inner side wall of the stator sleeve 214 is provided with the first cooling oil passage 2141.

[0126] In this way, the cooling oil in the first cooling oil passage 2141 can directly contact the core body 213, and the heat of the core body 213 can be promptly conducted away, thereby facilitating further improvement of the heat dissipation efficiency of the stator core 21. Moreover, this can also reduce the processing difficulty of the stator sleeve 214, facilitate the molding of the stator sleeve 214, and further reduce the production cost.

[0127] In an exemplary embodiment, the first cooling oil passage 2141 extends through the outer side wall of the stator sleeve 214 in the radial direction of the stator core 21, as shown in Figure 44 and Figure 45 In other words, the outer side wall of the stator sleeve 214 is provided with the first cooling oil passage 2141.

[0128] In this way, the cooling oil in the first cooling oil passage 2141 can directly contact the inner side wall of the housing assembly 1, and the heat of the stator core 21 can be promptly conducted to the housing assembly 1, thereby also facilitating further improvement of the heat dissipation efficiency of the stator core 21. Moreover, this can also reduce the processing difficulty of the stator sleeve 214, facilitate the molding of the stator sleeve 214, and further reduce the production cost.

[0129] In an exemplary embodiment, the inner side wall and the outer side wall of the stator sleeve 214 are both provided with the first cooling oil passage 2141.

[0130] The first cooling oil passages 2141 located in the inner side wall and the outer side wall of the stator sleeve 214 can be mutually through, combined into one, forming a cooling oil passage extending through the inner side wall and the outer side wall of the stator sleeve 214.

[0131] The first cooling oil passages 2141 located in the inner side wall and the outer side wall of the stator sleeve 214 can also be mutually independent. For example, the first cooling oil passage 2141 located in the inner side wall of the stator sleeve 214 can be staggered with the first cooling oil passage 2141 located in the outer side wall of the stator sleeve 214. In this way, it is beneficial to uniform heat dissipation and also beneficial to reduce the wall thickness of the stator sleeve 214.

[0132] In an exemplary embodiment, the stator sleeve 214 is an integrally formed structure by roll forming (which can be processed by a fixed shape hob) or die casting.

[0133] In an exemplary embodiment, the stator core 21 is provided with stator tooth slots 215, as shown in Figure 30 and Figure 34 . The radially inner end of the stator tooth slots 215 is open. The stator core 21 further comprises a stator slot wedge 23.

[0134] The stator slot wedge 23 is fixed at the radially inner end of the stator tooth slots 215 and seals the radially inner end of the stator tooth slots 215. The stator slot wedge 23 is a heat-conducting member. The stator slot wedge 23 is provided with a second cooling oil channel 234 extending along the axial direction of the stator core 21 (i.e. extending along the length direction of the stator slot wedge 23), as shown in Figure 29 , Figure 33 and Figure 35 . The second cooling oil channel is in communication with the oil inlet 1111 and the oil outlet 1121.

[0135] The stator slot wedge 23 of the present scheme has a sealing effect, which can prevent the cooling oil in the cooling cavity 13 from entering the assembly space of the rotor assembly 3 through the stator tooth slots 215 to contact the rotor assembly 3, thereby avoiding the loss of cooling oil caused by the rotation of the rotor assembly 3, and fundamentally solving the problem of oil stirring loss and improving the utilization rate of cooling oil.

[0136] On the other hand, the stator slot wedge 23 is also provided with a second cooling oil channel 234, and the cooling oil entering the cooling cavity 13 through the oil inlet 1111 can enter the second cooling oil channel 234, flow along the axial direction of the stator core 21 to the other end of the stator core 21, as shown in Figure 3 and Figure 46 , and then flow out through the oil outlet 1121. In this way, since the stator slot wedge 23 is a heat-conducting member, the cooling oil in the second cooling oil channel 234 can cool the inner side of the stator core 21 and the part of the stator coil 22 located in the stator tooth slots 215, thereby further improving the heat dissipation efficiency of the motor.

[0137] Since the position with the highest temperature of the stator assembly 2 is generally at the position of the stator tooth slots 215, and the existing cooling scheme cannot directly cool this position, but only cools the outside of the stator assembly 2 to indirectly take away part of the heat at the position of the stator tooth slots 215. The present scheme utilizes the second cooling oil channel 234 to directly pass the cooling oil to the position of the stator tooth slots 215, thereby cooling the inner side of the stator core 21 and the part of the stator coil 22 located in the stator tooth slots 215 at this position, thereby significantly improving the heat dissipation efficiency of the motor.

[0138] Thus, the two axial ends, the outer side, and the inner side of the stator core 21 can be cooled simultaneously, as shown in Figure 3 and Figure 46 , which greatly improves the cooling capacity of the stator core 21. Moreover, the outer part and the inner part of the end winding 221 of the stator coil 22 and the part of the stator coil 22 located in the stator tooth slot 215 can exchange heat with the cooling oil, which greatly improves the cooling capacity of the stator coil 22. Thus, the cooling efficiency of the motor is also greatly improved, and the heat generation requirement can be met, so that the rotor assembly 3 does not need to assist the stator assembly 2 in cooling by means of oil throwing, thereby avoiding the oil stirring loss.

[0139] In an exemplary embodiment, as shown in Figure 27 , Figure 28 , Figure 29 and Figure 31 , the two ends of the stator slot wedge 23 are provided with a first gap 231 and a second gap 232 communicating with the second cooling oil channel 234, respectively, the first gap 231 communicates with the cooling cavity 13 on the oil inlet side 1111, and the second gap 232 communicates with the cooling cavity 13 on the oil outlet side 1121. Since the two stator end plates (the first stator end plate 211 and the second stator end plate 212) are in contact with the core body 213, the gaps are provided so that the cooling oil in the cooling cavity 13 can enter the second cooling oil channel 234.

[0140] Alternatively, as shown in Figure 32 , Figure 33 and Figure 35 , the surface of the stator slot wedge 23 towards the stator coil 22 is provided with a third gap 233 penetrating through the two ends of the stator slot wedge 23, the third gap 233 communicates the cooling cavity 13 on the oil inlet side 1111 and the cooling cavity 13 on the oil outlet side 1121, and further communicates the oil inlet 1111 and the oil outlet 1121.

[0141] The first gap 231 is provided at the position of the stator slot wedge 23 corresponding to the first axial end of the stator core 21, which ensures that the cooling oil flowing through the end winding 221 on this side can enter the second cooling oil channel 234 through the first gap 231. The second gap 232 is provided at the position of the stator slot wedge 23 corresponding to the second axial end of the stator core 21, which ensures that the cooling oil in the second cooling oil channel 234 can flow out through the end winding 221 on this side, and further flow out through the oil outlet 1121.

[0142] Alternatively, the stator slot wedge 23 can also adopt a completely penetrating structure, which is equivalent to connecting the first gap 231 and the second gap 232 in the above-mentioned scheme to form the third gap 233, so that the inflow and outflow of the cooling oil in the second cooling oil channel 234 can also be ensured.

[0143] Of course, the stator core 21 can also not include the stator slot wedge 23, and the radial inner end of the stator tooth slot 215 can be closed.

[0144] In an exemplary embodiment, the stator tooth slot 215 is provided with a stop shoulder 2151 for stopping the stator slot wedge 23, as shown in Figure 25 and Figure 26 The stop shoulder 2151 can serve as a positioning function and a limiting function for the stator slot wedge 23, facilitating quick and accurate installation of the stator slot wedge 23.

[0145] In an exemplary embodiment, the processing technology of the stator core 21 is as follows: first, after the stator punching sheet is punched, the core body 213 is formed by stacking and welding. Then, the stator slot wedges 23 are evenly installed. Next, glue is brushed on the side of the first stator end plate 211 provided with the oil inlet channel 2113 and the side of the second stator end plate 212 provided with the oil outlet channel 2123, and then the side of the first stator end plate 211 brushed with glue is pressed against the front end of the core body 213, and the side of the second stator end plate 212 brushed with glue is pressed against the rear end of the core body 213. Finally, the stator sleeve 214 is assembled.

[0146] In an exemplary embodiment, the rotor assembly 3 is separated from the cooling cavity 13 to limit the cooling oil in the cooling cavity 13 from contacting the rotor assembly 3. In other words, the cooling cavity 13 is a sealed cavity, and the rotor assembly 3 is located outside the cooling cavity 13.

[0147] In this way, the cooling oil in the cooling cavity 13 for cooling the stator assembly 2 can be prevented from contacting the rotor assembly 3, thereby fundamentally avoiding the occurrence of oil mixing loss.

[0148] In an exemplary embodiment, as shown in Figure 1 The housing assembly 1 includes an outer shell 11 and a partition 12. The outer shell 11 is provided with an oil inlet 1111 and an oil outlet 1121. The partition 12 is fixed in the outer shell 11 and surrounds at least part of the cooling cavity 13 with the outer shell 11.

[0149] The partition 12 includes at least one sleeve 120, which is sealingly connected to the outer shell 11, as shown in Figure 14 The sleeve 120 sealingly connected to the end cover 112 is referred to as a first sleeve 121, and the sleeve 120 sealingly connected to the casing 111 is referred to as a second sleeve 122.

[0150] Since the shell assembly 1 comprises the shell 11 and the partition 12, the partition 12 is fixed in the shell 11 and can surround at least part of the cooling cavity 13 together with the shell 11, and since the partition 12 comprises at least one sleeve 120 and the sleeve 120 is sealingly connected with the shell 11, the leakage of the cooling oil in the cooling cavity 13 to the outside of the cooling cavity 13 through the gap between the sleeve 120 and the shell 11 can be avoided, and the leakage of the cooling oil in the cooling cavity 13 to the rotor assembly 3 can be avoided to reduce the oil stirring loss.

[0151] Since the sleeve 120 is adjacent to the stator coil 22, the sleeve 120 must have good insulation and anti-cutting properties and low permeability. Therefore, the material of the sleeve 120 can be, but is not limited to, polymeric resin material, carbon fiber, carbon fiber composite material, glass fiber composite, etc.

[0152] In an exemplary embodiment, the sleeve 120 is sealingly connected with the shell 11 through the sealing member 14.

[0153] The shell 11 is provided with a first mounting groove 113, as shown in Figure 8 The sealing member 14 is mounted in the first mounting groove 113, as shown in Figure 12 and Figure 14 .

[0154] As shown in Figure 9 , Figure 10 and Figure 11 , one end of the sleeve 120 connected with the shell 11 is provided with two first sealing rings 123 arranged concentrically, and a first sealing groove 124 is formed between the two first sealing rings 123.

[0155] As shown in Figure 12 and Figure 13 , the sealing member 14 comprises a sealing body 141 and two second sealing rings 142 connected with the sealing body 141, the two second sealing rings 142 are arranged concentrically, and a second sealing groove 143 is formed between the two second sealing rings 142.

[0156] As shown in Figure 14 , one of the first sealing rings 123 is inserted into the second sealing groove 143 and sealingly cooperates with the groove wall of the second sealing groove 143, and one of the second sealing rings 142 is inserted into the first sealing groove 124 and sealingly cooperates with the groove wall of the first sealing groove 124.

[0157] In this way, the sleeve 120 and the sealing member 14 form a mutual embedding structure, multiple sealing surfaces are formed, the leakage path of the cooling oil is in a serpentine shape, the length of the leakage cooperation surface is increased, a labyrinth cooperation sealing structure is formed, and thus a reliable sealing effect is achieved.

[0158] Alternatively, the sleeve 120 can also not be provided with the two first sealing rings 123, and the end of the sleeve 120 is directly inserted into the second sealing groove 143 of the sealing member 14 to achieve sealing cooperation, at this time, the permeation path is in a U shape, has a relatively long length, and has a good sealing effect.

[0159] Of course, the sealing member 14 can also be an ordinary O-shaped sealing ring, or can also be directly sealed by the sealing glue 15. However, the O-shaped sealing ring and the sealing glue 15 both require sufficient sealing space, and the thickness of the O-shaped sealing ring and the thickness of the sealing glue 15 after curing will be superimposed on the axial dimension of the motor, resulting in an increase in the requirement of the motor on the assembly space.

[0160] The labyrinth sealing scheme of the embodiment of the application makes full use of the internal space of the sealing member 14 itself and the internal space of the sleeve 120, facilitates sealing in a small space, can avoid the increase in the axial dimension of the motor, is conducive to the miniaturization of the motor, and reduces the requirement of the motor on the assembly space.

[0161] In an exemplary embodiment, the first sealing groove 124 and / or the second sealing groove 143 can be provided with the sealing glue 15, as shown in Figure 14 . In this way, the sealing reliability can be further improved.

[0162] During assembly, the sealing glue 15 has high fluidity, and the sleeve 120 and the sealing member 14 can be extruded to each other during assembly, so that the sealing glue 15 is extruded into the first sealing groove 124 / second sealing groove 143, and reliable sealing is formed after the sealing glue 15 is cured.

[0163] In this way, the sleeve 120 and the sealing member 14 realize double sealing by extrusion interference and glue injection, and the sealing is relatively reliable.

[0164] In an exemplary embodiment, as shown in Figure 1 and Figure 2 , the housing 11, the partition 12, and the stator assembly 2 enclose the cooling cavity 13. The number of sleeves 120 is two, one end of the sleeve 120 is sealingly connected with the housing 11, and the other end of the sleeve 120 is sealingly connected with the axial end of the stator core 21 of the stator assembly 2.

[0165] This scheme utilizes the housing 11, the partition 12, and the stator assembly 2 to enclose the cooling cavity 13, so that only relatively short sleeves 120 need to be respectively arranged on the two axial sides of the stator core 21. Compared with arranging an entire sleeve 120 to connect the two axial ends of the housing 11, this scheme is conducive to shortening the total length of the sleeve 120, saving the material of the sleeve 120, thereby reducing the production cost, and also can avoid the sleeve 120 penetrating through the entire air gap.

[0166] In the scheme, the inner side wall of the stator core 21 participates in the formation of the cooling cavity 13, so the inner side wall of the stator core 21 is equivalent to being located outside the cooling cavity 13, and the stator assembly 2 is partially located inside the cooling cavity 13. However, since the stator core 21 is provided with cooling oil channels at both axial ends and the radial inner and outer parts, the stator core 21 has high heat dissipation efficiency.

[0167] On the other hand, the sleeve 120 is also in sealing connection with the axial end of the stator core 21, which can effectively prevent the cooling oil in the cooling cavity 13 from leaking to the rotor assembly 3 through the connection part of the sleeve 120 and the stator core 21, thereby facilitating the avoidance of oil stirring loss.

[0168] The stator core 21 is provided with a stator tooth slot 215, as shown in Figure 30 and Figure 34 . The radial inner end of the stator tooth slot 215 is open. The stator core 21 further includes a stator slot wedge 23, which is fixed at the radial inner end of the stator tooth slot 215 and is a heat-conducting member. For the scheme in which the radial inner end of the stator tooth slot 215 is open and the stator slot wedge 23 is a sealing member 14, the inner side of the stator core 21 is also sealed by the stator slot wedge 23. For the scheme in which the radial inner end of the stator tooth slot 215 is closed, the inner side wall of the stator core 21 also forms a seal.

[0169] In this way, the cooling cavity 13 forms a sealed cavity and is separated from the rotor assembly 3, which can effectively prevent the cooling oil in the cooling cavity 13 from leaking and contacting the rotor assembly 3, thereby fundamentally avoiding oil stirring loss.

[0170] In an exemplary embodiment, as shown in Figure 15 , the axial end of the stator core 21 is provided with a second mounting groove 216. The end of the stator core 21 connected by the sleeve 120 is provided with two third sealing rings 125 arranged concentrically, and a third sealing groove 126 is formed between the two third sealing rings 125.

[0171] One of the third sealing rings 125 is inserted into the second mounting groove 216 and sealingly engages with the groove wall of the second mounting groove 216. The second mounting groove 216 and / or the third sealing groove 126 is provided with sealing glue 15.

[0172] In this way, the sleeve 120 and the stator core 21 also form a mutual nested labyrinth seal structure, and the sealing glue 15 can ensure the sealing reliability, thereby effectively preventing the cooling oil from leaking to the rotor assembly 3 and avoiding oil stirring loss.

[0173] In this way, the axial end of the stator core 21 and the sleeve 120 can also be double-sealed by extrusion interference and glue injection, and the sealing is more reliable.

[0174] Wherein, since the first stator end plate 211 forms the first axial end of the stator core 21, and the second stator end plate 212 forms the second axial end of the stator core 21. Therefore, the first stator end plate 211 and the second stator end plate 212 of the stator core 21 are both provided with the second mounting groove 216, as shown in Figure 20 and Figure 21 . The first stator end plate 211 and the second stator end plate 212 are respectively sealed and connected with the two sleeves 120 through a labyrinth sealing scheme.

[0175] Alternatively, the sleeve 120 can also not be provided with the two third sealing rings 125, and the end of the sleeve 120 is directly inserted into the second mounting groove 216 to realize sealing cooperation, at this time the infiltration path is U-shaped, also has a longer length, and also has a better sealing effect.

[0176] In an exemplary embodiment (not shown in the figure), the shell 11 and the partition 12 enclose the cooling cavity 13, the number of sleeves 120 is one, the sleeve 120 is sleeved on the inner side of the stator assembly 2, and the two ends of the sleeve 120 are sealed and connected with the shell 11.

[0177] This scheme utilizes the shell 11 and the partition 12 to form the cooling cavity 13, and then the stator assembly 2 and the rotor assembly 3 are completely separated by the partition 12, which can fundamentally avoid the occurrence of oil mixing loss. Moreover, the stator assembly 2 can be completely located in the cooling cavity 13, and then the stator assembly 2 can be completely immersed in the cooling oil, thereby having a higher heat dissipation efficiency.

[0178] In an exemplary embodiment, as shown in Figure 1 , the shell 11 includes a casing 111 and an end cover 112.

[0179] Wherein, one end of the casing 111 is provided as an open end. The end cover 112 is covered at the open end of the casing 111 and is fixedly connected with the casing 111. One of the casing 111 and the end cover 112 is provided with an oil inlet 1111, and the other is provided with an oil outlet 1121.

[0180] In one example, the casing 111 is open at the rear end, and the end cover 112 is covered at the rear end of the casing 111. The oil inlet 1111 is arranged at the front end of the casing 111, and the oil outlet 1121 is arranged on the end cover 112, as shown in Figure 7 and Figure 8 . The front end of the casing 111 is provided with a first mounting groove 113. The end cover 112 is also provided with a first mounting groove 113, as shown in Figure 2 , Figure 6 and Figure 8 .

[0181] The sleeve 120 sealedly connected with the end cover 112 is referred to as a first sleeve 121, and the sleeve 120 sealedly connected with the casing 111 is referred to as a second sleeve 122. In the assembly process, after the stator core 21 and the stator coil 22 are assembled, the second sleeve 122 and the casing 111 are assembled and sealed. Then the first sleeve 121 and the end cover 112 are assembled and sealed.

[0182] Wherein, before the first sleeve 121 and the second sleeve 122 are installed, a high-flow sealant 15 is coated in the first sealing groove 124 of the first sleeve 121 and the second sleeve 122, and then when the sleeve 120 is installed, the sleeve 120 can extrude the sealant 15 into the inside of the second sealing groove 143 to form a seal. Thus, the penetration path of the sealing structure forms a labyrinth path, realizing labyrinth sealing.

[0183] In this way, the end cover 112, the first sleeve 121, the casing 111, the second sleeve 122, and the stator core 21 enclose the cooling cavity 13, which is filled with cooling oil, and most of the stator assembly 2 (except the inner side wall of the stator core 21) can be immersed in the cooling cavity 13. The cooling oil flows in the cooling cavity 13, and contact oil cooling is adopted to timely remove the heat of the stator assembly 2, greatly improving the heat dissipation efficiency of the motor compared with the oil shower scheme.

[0184] Of course, the casing can also be open at both ends, and the casing includes the casing and two end covers, and the two end covers are connected with the two ends of the casing, respectively. At this time, one end cover is provided with an oil inlet, and the other end cover is provided with an oil outlet. Alternatively, the casing can be open at the front end, and the end cover is a front end cover.

[0185] In an exemplary embodiment, as shown in Figures 1 to 4 The number of oil inlets 1111 is multiple, and the multiple oil inlets 1111 are arranged along the circumference of the motor. The number of oil outlets 1121 is multiple, and the multiple oil outlets 1121 are arranged along the circumference of the motor. In this way, it is beneficial to improve the flow of cooling oil in the cooling cavity 13, thereby improving the heat dissipation efficiency of the motor and improving the uniformity of heat dissipation.

[0186] In one example, the number of oil inlets 1111 is two, as shown in Figure 1 and Figure 4 The two oil inlets 1111 are symmetrically arranged. The number of oil outlets 1121 is two, and the two oil outlets 1121 are symmetrically arranged.

[0187] In an exemplary embodiment, as shown in Figure 2As shown, the rotor assembly 3 is hollow inside, and the inner cavity of the rotor assembly 3 forms a third cooling oil channel 31 for cooling the rotor assembly 3, so that the cooling oil can also enter the rotor assembly 3 to cool the rotor assembly 3. In this way, the stator assembly 2 and the rotor assembly 3 are each efficiently cooled by the cooling oil, ensuring the heat dissipation efficiency of the motor.

[0188] In an exemplary embodiment, as shown in Figure 2 、 Figure 3 and Figure 4 , the casing 111 is further provided with a water cooling channel 1112 and a water inlet 1113 and a water outlet 1114 communicating with the water cooling channel 1112, and the water cooling channel 1112 is arranged around the side wall of the casing 111.

[0189] The water cooling channel 1112 can timely remove the heat of the cooling oil in the cooling cavity 13 by cooling water, thereby realizing a mixed cooling scheme of oil cooling and water cooling, and further improving the heat dissipation efficiency of the motor.

[0190] In an example, as shown in Figure 1 and Figure 4 , the water inlet 1113 and the water outlet 1114 of the water cooling channel 1112 are both arranged on the side wall of the casing 111, and one is located at the front of the side wall of the casing 111, and the other is located at the rear of the side wall of the casing 111. By circulating the cooling water, a water cooling scheme is formed, which can further improve the heat dissipation efficiency of the motor.

[0191] In an exemplary embodiment, the water cooling channel 1112 is spirally arranged around the casing 111, as shown in Figure 2 and Figure 3 . Alternatively, the cross section of the water cooling channel 1112 is annular, and the side wall of the casing 111 is arranged as a hollow structure or an inner and outer nested structure.

[0192] In this way, the cooling water and the circumferential cooling oil of the stator assembly 2 can fully exchange heat, thereby further improving the heat dissipation efficiency of the motor.

[0193] In an example, the water of the cooling channel comes from the cooling water of the motor controller 4. In other words, the cooling water cooled by the motor controller 4 enters the water cooling channel 1112 of the motor casing 111 to remove the heat of the cooling oil in the motor.

[0194] Of course, the water cooling channel 1112 can also not be provided, as shown in Figure 5 and Figure 6 .

[0195] The embodiments of the present application also provide a power assembly comprising the motor of any of the above embodiments, and thus has all the beneficial effects of any of the above embodiments, which will not be repeated here.

[0196] In an exemplary embodiment, the power assembly further comprises an oil pump 5, an oil cooler 6, and the like, as shown in Figure 47 .

[0197] The cooling oil cools the rotor assembly 3 and the stator assembly 2 of the motor after being pumped by the oil pump 5, flows to the oil cooler 6 through the pipeline, is cooled by the oil cooler 6, and is returned to the oil pump 5, thereby realizing the circulation of the oil circuit.

[0198] In an exemplary embodiment, the motor housing 111 is provided with a water cooling channel 1112. The power assembly further comprises a motor controller 4, a water pump 7, a water cooler 8, and the like, as shown in Figure 48 .

[0199] The water pump 7 injects low-temperature cooling water into the motor controller 4, and the cooling water cools the motor controller 4, enters the water cooling channel 1112 of the motor housing 111 to cool the stator assembly 2, and the high-temperature cooling water flowing out of the motor housing 111 enters the water cooler 8 to be cooled, and the low-temperature cooling water after being cooled enters the water pump 7, thereby realizing the circulation of the water circuit.

[0200] As shown in Figure 49 , the embodiment of the present application further provides a vehicle 100 comprising wheels, a transmission device, and the motor of any one of the above embodiments, and thus has all the beneficial effects of any one of the above embodiments, which will not be described herein again.

[0201] In an example, the motor can be, but is not limited to, a driving motor or a generator or an auxiliary driving motor.

[0202] In an example, the motor can drive the wheels to rotate through the transmission device.

[0203] In summary, the motor provided by the embodiment of the present application adopts the contact oil cooling, immerses the stator assembly in the cooling oil, and the two ends, the inner circle, the outer circle of the stator core, and the end part and the intermediate part of the stator coil are all in heat exchange with the cooling oil, thereby greatly improving the heat dissipation efficiency of the motor; the mixed cooling scheme of water cooling and oil cooling is adopted, thereby further improving the heat dissipation efficiency of the motor; the axial flow channel is adopted, thereby shortening the oil return period and making the axial cooling liquid more easily obtained in the power assembly; the uniformly distributed heat dissipation holes (such as the first oil inlet hole, the first oil outlet hole, the second oil inlet hole, and the second oil outlet hole) and the cooling flow channels (such as the oil inlet flow channel, the oil outlet flow channel, the first cooling oil channel, and the second cooling oil channel) on the stator core uniformly distribute the cooling oil flow, and the second oil inlet hole and the second oil outlet hole are opposite to the middle position of the end winding, thereby realizing the uniform heat dissipation and avoiding the heat dissipation dead zone; the labyrinth sealing scheme is adopted, thereby realizing the small-space sealing and being conducive to the miniaturization of the motor; the cooling cavity is sealed, thereby avoiding the contact between the cooling oil for cooling the stator assembly and the rotor assembly and avoiding the oil stirring loss; and the stator slot wedge can participate in the sealing and the formation of the cooling oil channel, which is a clever design.

[0204] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0205] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0206] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0207] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0208] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0209] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An electric machine characterized in that, The motor comprises: a housing assembly, which is provided with a cooling cavity for cooling oil to flow, and is provided with an oil inlet and an oil outlet communicating with the cooling cavity; a stator assembly, which is at least partially arranged in the cooling cavity so that the stator assembly can be at least partially immersed in the cooling oil; and a rotor assembly, which is rotatably sleeved on the inside of the stator assembly. The housing assembly comprises an outer shell and a partition, the outer shell is provided with the oil inlet and the oil outlet, the partition is fixed in the outer shell and cooperates with the outer shell to enclose at least part of the cooling cavity, and the partition comprises at least one sleeve which is sealingly connected to the outer shell by a sealing member. The outer shell is provided with a first mounting groove, the sealing member is arranged in the first mounting groove, one end of the sleeve connected to the outer shell is provided with two first sealing rings arranged concentrically, and a first sealing groove is formed between the two first sealing rings, the sealing member comprises a sealing main body and two second sealing rings connected to the sealing main body, the two second sealing rings are arranged concentrically, and a second sealing groove is formed between the two second sealing rings, one of the first sealing rings is inserted into the second sealing groove and sealingly cooperates with the groove wall of the second sealing groove, and one of the second sealing rings is inserted into the first sealing groove and sealingly cooperates with the groove wall of the first sealing groove. The stator assembly comprises:

2. The electric machine of claim 1, wherein, a stator core, which is at least partially located in the cooling cavity; and a stator coil, which is located in the cooling cavity and fixed to the stator core.

3. The motor according to claim 2, wherein: the stator core is provided with an oil inlet flow channel located inside the stator core, the axial first end portion of the stator core is provided with a first oil inlet hole, the inlet of the first oil inlet hole penetrates the end face of the axial first end portion of the stator core to communicate with the oil inlet, and the outlet of the first oil inlet hole communicates with the oil inlet flow channel; and / or the stator core is provided with an oil outlet flow channel located inside the stator core, the axial second end portion of the stator core is provided with a first oil outlet hole, the inlet of the first oil outlet hole communicates with the oil outlet flow channel, and the outlet of the first oil outlet hole penetrates the end face of the axial second end portion of the stator core to communicate with the oil outlet.

4. The motor according to any one of claims 1 to 3, wherein: the outer shell, the partition and the stator assembly enclose the cooling cavity, the number of sleeves is two, one end of the sleeve is sealingly connected to the outer shell, and the other end of the sleeve is sealingly connected to the axial end portion of the stator core of the stator assembly.

5. The motor according to claim 4, wherein: the axial end portion of the stator core is provided with a second mounting groove; one end of the sleeve connected to the stator core is provided with two third sealing rings arranged concentrically, and a third sealing groove is formed between the two third sealing rings; one of the third sealing rings is inserted into the second mounting groove, and the second mounting groove and / or the third sealing groove is provided with sealing glue. The outer shell comprises:

6. The electric machine of any one of claims 1 to 3, wherein, ​ A casing, one end of which is provided as an open end; and An end cover, which is arranged at the open end of the casing and fixedly connected with the casing; Wherein, one of the casing and the end cover is provided with the oil inlet, and the other is provided with the oil outlet.

7. The electric machine according to claim 6, characterized in that The casing is further provided with a water cooling channel, and a water inlet and a water outlet connected with the water cooling channel, and the water cooling channel is arranged around the side of the casing.

8. A powertrain, characterized by, An electric machine comprising any one of the electric machines according to claims 1 to 7.

9. A vehicle characterized by comprising: An electric machine comprising any one of the electric machines according to claims 1 to 7.

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