Electric machines, powertrains and vehicles

Abstract

The embodiment of the application provides a motor, a power assembly and a vehicle. The motor comprises: a shell assembly provided with an oil inlet and an oil outlet; a stator assembly arranged in the shell assembly; and a rotor assembly rotatably sleeved on the inner side of the stator assembly; wherein the shell assembly is provided with a cooling cavity communicating with the oil inlet and the oil outlet, and the cooling cavity is used for flowing of cooling oil for cooling the stator assembly; and the rotor assembly is separated from the cooling cavity to limit the cooling oil in the cooling cavity from contacting the rotor assembly. In the scheme, the cooling cavity is separated from the rotor assembly, the cooling oil in the cooling cavity for cooling the stator assembly can be prevented from contacting the rotor assembly, the cooling oil can be prevented from being thrown out by the rotation of the rotor assembly to cause loss of the cooling oil, the problem of oil stirring loss can be fundamentally solved, and the utilization rate of the cooling oil is improved.

Description

TECHNICAL FIELD

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

[0002] At present, the demand for electric vehicles is increasing, and the power assembly is a key component. Improving the heat dissipation capacity of the power assembly is the most effective way.

[0003] In the existing motor cooling technology, a common cooling scheme is to spray oil on the outer circle of the stator coil end, spray cooling oil on the outer circle of the stator coil end, and use the rotation of the rotor assembly to throw the oil to the inside of the stator assembly. However, using the rotor assembly to cool the stator assembly will cause some cooling oil to be lost during the rotation and throwing process, i.e., there is a problem of oil stirring loss. SUMMARY

[0004] The electric motor, the power assembly, and the vehicle provided by the embodiments of the present application can seal the cooling oil for cooling the stator assembly in the cooling cavity and separate the cooling oil from the rotor assembly, thereby fundamentally avoiding the oil stirring loss.

[0005] The electric motor provided by the embodiments of the present application includes a housing assembly, a stator assembly, and a rotor assembly. The housing assembly is provided with an oil inlet and an oil outlet. The stator assembly is arranged in the housing assembly. The rotor assembly is rotatably sleeved on the inside of the stator assembly. The housing assembly is provided with a cooling cavity that is connected to the oil inlet and the oil outlet. The cooling cavity is used for the flow of cooling oil for cooling the stator assembly. The rotor assembly is separated from the cooling cavity to limit the cooling oil in the cooling cavity from contacting the rotor assembly.

[0006] The electric motor provided by the embodiments of the present application includes a housing assembly, a stator assembly, and a rotor assembly. The housing assembly is provided with a cooling cavity. The cooling oil can enter the cooling cavity through the oil inlet of the housing assembly and flow out through the oil outlet of the housing assembly to cool the stator assembly and ensure the heat dissipation efficiency of the stator assembly. Moreover, the cooling cavity is separated from the rotor assembly, so that the cooling oil in the cooling cavity for cooling the stator assembly does not contact the rotor assembly, thereby avoiding the loss of the cooling oil caused by the throwing of the cooling oil by the rotation of the rotor assembly. This is conducive to fundamentally solving the problem of oil stirring loss, improving the utilization rate of the cooling oil, and further improving the heat dissipation capacity of the motor. The torque density and power density of the power assembly also increase, so as to realize the lightweight and miniaturization of the motor, and further realize the lightweight and miniaturization of the vehicle.

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

[0008] In an exemplary embodiment, the radially inner end of the stator tooth slot is open, and a stator slot wedge is arranged at the radially inner end of the stator tooth slot, and the stator slot wedge is made of flexible material to seal the radially inner end of the stator tooth slot; or the radially inner end of the stator tooth slot is closed.

[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.

[0010] In an exemplary embodiment, the partition comprises at least one sleeve in sealing connection with the housing.

[0011] In an exemplary embodiment, the sleeve is in sealing connection with the housing through a sealing member.

[0012] In an exemplary embodiment, 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 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.

[0013] In an exemplary embodiment, the first sealing groove and / or the second sealing groove is provided with sealing glue.

[0014] In an exemplary embodiment, the housing, the partition, and the stator assembly jointly surround the cooling cavity, the number of the sleeves is two, one end of the sleeve is in sealing connection with the housing, and the other end of the sleeve is in sealing connection with the axial end of the stator core of the stator assembly.

[0015] In an exemplary embodiment, the axial end of the stator core is provided with a second mounting groove; one end of the sleeve connected with 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 sealingly cooperates with the groove wall of the second mounting groove; the second mounting groove and / or the third sealing groove is provided with sealing glue.

[0016] In an exemplary embodiment, the shell and the partition wall enclose the cooling cavity, the number of the sleeves is one, the sleeve is sleeved on the inner side of the stator assembly, and two ends of the sleeve are sealingly connected with the shell.

[0017] In an exemplary embodiment, the shell comprises a cabinet, an open end of the cabinet is provided, and an end cover is arranged at the open end of the cabinet and fixedly connected with the cabinet; wherein one of the cabinet and the end cover is provided with the oil inlet, and the other is provided with the oil outlet.

[0018] The embodiments of the present application also provide a power assembly comprising the motor according to any one of the above embodiments.

[0019] The embodiments of the present application also provide a vehicle comprising the motor according to any one of the above embodiments.

[0020] 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

[0021] The accompanying drawings are included to provide a further understanding of the technical scheme of the present application, and constitute a part of the specification, and are used to explain the technical scheme of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0022] Figure 1 The exploded structural schematic diagram of the motor provided for an embodiment of the present application is shown in the figure;

[0023] Figure 2 The exploded structural schematic diagram of the motor provided for an embodiment of the present application is shown in the figure; Figure 1 The sectional view of the motor is shown in the figure;

[0024] Figure 3 The exploded structural schematic diagram of the motor provided for an embodiment of the present application is shown in the figure; Figure 2 The cooling principle schematic diagram of the stator assembly of the motor (without the rotor assembly) is shown in the figure;

[0025] Figure 4 The exploded structural schematic diagram of the motor provided for an embodiment of the present application is shown in the figure; Figure 1 The assembled perspective view of the motor is shown in the figure;

[0026] Figure 5 The exploded structural schematic diagram of the motor provided for another embodiment of the present application is shown in the figure;

[0027] Figure 6 The exploded structural schematic diagram of the motor provided for an embodiment of the present application is shown in the figure; Figure 5 The sectional view of the motor is shown in the figure;

[0028] Figure 7 The exploded structural schematic diagram of the motor provided for an embodiment of the present application is shown in the figure;

[0029] Figure 8 A cross-sectional view of the end cover is shown in FIG. 18. Figure 7

[0030] Figure 9 A perspective view of the sleeve is shown in FIG. 19.

[0031] Figure 10 A cross-sectional view of the sleeve is shown in FIG. 20. Figure 9

[0032] Figure 11 An enlarged view of portion A in FIG. 8 is shown in FIG. 21. Figure 10

[0033] Figure 12 A perspective view of the seal is shown in FIG. 22.

[0034] Figure 13 A cross-sectional view of the seal is shown in FIG. 23. Figure 12

[0035] Figure 14 A view of the labyrinth seal formed by the seal and the sleeve is shown in FIG. 24.

[0036] Figure 15 A view of the labyrinth seal formed by the sleeve and the second stator end plate is shown in FIG. 25.

[0037] Figure 16 A cross-sectional view of the stator assembly is shown in FIG. 26.

[0038] Figure 17 A partial cross-sectional view of the stator core is shown in FIG. 27.

[0039] Figure 18 A front view of the first stator end plate is shown in FIG. 28.

[0040] Figure 19 An enlarged view of portion B in FIG. 18 is shown in FIG. 29.

[0041] Figure 20 A cross-sectional view of the first stator end plate is shown in FIG. 30. Figure 18

[0042] Figure 21 An enlarged view of portion C in FIG. 18 is shown in FIG. 31. Figure 20

[0043] Figure 22 A partial view of the oil inlet side of the stator assembly is shown in FIG. 32.

[0044] Figure 23 A cross-sectional view of the stator assembly is shown in FIG. 33.​​​​​​Figure 22 Partial structure diagram of oil outlet side of the stator assembly shown in the figure;

[0045] Figure 24 Partial structure diagram of the stator core provided for an embodiment of the present application;

[0046] Figure 25 Front view structure diagram of the stator core provided for an embodiment of the present application;

[0047] Figure 26 Provided for an embodiment of the present application is a partial structure diagram of the stator core; Figure 25 Enlarged diagram of the D part shown in the figure;

[0048] Figure 27 Structure diagram of the stator slot wedge provided for an embodiment of the present application;

[0049] Figure 28 Provided for an embodiment of the present application is a partial structure diagram of the stator core; Figure 27 Cross-sectional structure diagram of the stator slot wedge shown in the figure;

[0050] Figure 29 Provided for an embodiment of the present application is a partial structure diagram of the stator core; Figure 28 Side view structure diagram of the stator slot wedge shown in the figure;

[0051] Figure 30 Assembly diagram of the stator core with the stator slot wedge provided for an embodiment of the present application;

[0052] Figure 31 Provided for an embodiment of the present application is a partial structure diagram of the stator core; Figure 30 Enlarged diagram of the E part shown in the figure;

[0053] Figure 32 Structure diagram of the stator slot wedge provided for an embodiment of the present application;

[0054] Figure 33 Provided for an embodiment of the present application is a partial structure diagram of the stator core; Figure 32 Side view structure diagram of the stator slot wedge shown in the figure;

[0055] Figure 34 Assembly diagram of the stator core with the stator slot wedge provided for another embodiment of the present application;

[0056] Figure 35 Provided for an embodiment of the present application is a partial structure diagram of the stator core; Figure 34 Enlarged diagram of the F part shown in the figure;

[0057] Figure 36 Three-dimensional structure diagram of the stator sleeve provided for an embodiment of the present application;

[0058] Figure 37 Provided for an embodiment of the present application is a partial structure diagram of the stator core; Figure 36 Cross-sectional structure diagram of the stator sleeve shown in the figure;

[0059] Figure 38A perspective view of a stator sleeve according to another embodiment of the application;

[0060] Figure 39 A perspective view of a stator sleeve according to another embodiment of the application; Figure 38 A cross-sectional view of the stator sleeve according to another embodiment of the application;

[0061] Figure 40 A perspective view of a stator sleeve according to another embodiment of the application;

[0062] Figure 41 A cross-sectional view of the stator sleeve according to another embodiment of the application; Figure 40 A cross-sectional view of the stator sleeve according to another embodiment of the application;

[0063] Figure 42 A perspective view of a stator sleeve according to another embodiment of the application;

[0064] Figure 43 A cross-sectional view of the stator sleeve according to another embodiment of the application; Figure 42 A cross-sectional view of the stator sleeve according to another embodiment of the application;

[0065] Figure 44 A perspective view of a stator sleeve according to another embodiment of the application;

[0066] Figure 45 A cross-sectional view of the stator sleeve according to another embodiment of the application; Figure 44 A cross-sectional view of the stator sleeve according to another embodiment of the application;

[0067] Figure 46 A schematic view of the cooling oil flow of a stator assembly according to an embodiment of the application;

[0068] Figure 47 A schematic view of the cooling principle of a power assembly according to an embodiment of the application;

[0069] Figure 48 A schematic view of the cooling principle of a power assembly according to another embodiment of the application;

[0070] Figure 49 A schematic view of a vehicle according to an embodiment of the application.

[0071] wherein, Figures 1 to 49 The reference signs in the drawings correspond as follows:

[0072] 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;

[0073] 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;

[0074] 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

[0075] With the increasing requirement of the power performance of the electric vehicle, the torque density and the power density of the power assembly, which is one of the core components of the power output of the electric vehicle, also increase to realize the light weight and the small size 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.

[0076] And improving the heat dissipation capacity of the motor is an important scheme to improve the torque density and the power density of the motor. Therefore, how to reduce or even avoid the oil stirring loss on the basis of meeting the heat dissipation requirement of the motor is the direction and the research focus of the person skilled in the art.

[0077] To make the purpose, the technical scheme and the advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0078] As Figures 1 to 4As shown, one embodiment of this application provides an electric motor, including: a housing assembly 1, a stator assembly 2, and a rotor assembly 3. The housing assembly 1 is provided with an oil inlet 1111 and an oil outlet 1121. The stator assembly 2 is installed inside the housing assembly 1. The rotor assembly 3 is rotatably fitted inside the stator assembly 2.

[0079] The housing assembly 1 includes a cooling chamber 13 connected to an oil inlet 1111 and an oil outlet 1121. The cooling chamber 13 supplies cooling oil for the stator assembly 2. The rotor assembly 3 is separated from the cooling chamber 13 to prevent the cooling oil in the cooling chamber 13 from contacting the rotor assembly 3. In other words, the cooling chamber 13 is a sealed chamber, and the rotor assembly 3 is located outside the cooling chamber 13.

[0080] The motor provided in this embodiment includes a housing assembly 1, a stator assembly 2, and a rotor assembly 3. A cooling chamber 13 is provided within the housing assembly 1. Cooling oil can enter the cooling chamber 13 through the oil inlet 1111 of the housing assembly 1 and flow out through the oil outlet 1121 of the housing assembly 1, cooling the stator assembly 2 and ensuring the heat dissipation efficiency of the stator assembly 2. Furthermore, the cooling chamber 13 is separated from the rotor assembly 3, which prevents the cooling oil in the cooling chamber 13 used to cool the stator assembly 2 from contacting the rotor assembly 3. This avoids the cooling oil being thrown out and lost during rotor assembly 3 rotation, fundamentally solving the problem of oil churning loss and improving the utilization rate of the cooling oil.

[0081] In one exemplary embodiment, the stator assembly 2 is at least partially housed within the cooling chamber 13 so that the stator assembly 2 is at least partially immersed in cooling oil.

[0082] Since at least a portion of the stator assembly 2 is located within the cooling chamber 13, at least a portion of the stator assembly 2 can be immersed in the cooling oil within the cooling chamber 13, directly contacting the cooling oil to achieve contact oil cooling. In this way, under hydraulic pressure, the cooling oil can make full contact with the stator assembly 2, resulting in a relatively large contact area between the stator assembly 2 and the cooling oil, increasing the heat dissipation area of ​​the stator assembly 2. Furthermore, the flowing cooling oil can promptly remove heat from the stator assembly 2, thus significantly improving the motor's heat dissipation efficiency compared to oil-spraying cooling methods.

[0083] In one exemplary embodiment, the stator assembly 2 includes: a stator core 21 and a stator coil 22, such as Figure 16 As shown.

[0084] Among them, such as Figure 2 As shown, the stator core 21 is at least partially located within the cooling chamber 13 and is provided with stator slots 215. The stator coil 22 is located within the cooling chamber 13 and is fixed to the stator slots 215.

[0085] The stator assembly 2 comprises a stator core 21 and a stator coil 22. Since at least a portion of the stator core 21 is located in the cooling cavity 13, at least a portion of the stator core 21 can be immersed in the cooling oil. In this way, the cooling oil can directly contact the stator core 21 for contact heat conduction, and the heat of the stator core 21 can be timely taken away. The stator coil 22 is also located in the cooling cavity 13, so the stator coil 22 can also be immersed in the cooling oil. In this way, the cooling oil can directly contact the stator coil 22 for contact heat conduction, and the heat of the stator coil 22 can be timely taken away. In this way, the stator core 21 and the stator coil 22 can both be in contact with the cooling oil for contact heat conduction, and the generated heat can be timely taken away by the flowing cooling oil, thereby ensuring that the motor has high heat dissipation efficiency.

[0086] In an exemplary embodiment, the radially inner end of the stator tooth slot 215 is open, as shown in Figure 30 and Figure 34 The radially inner end of the stator tooth slot 215 is provided with a stator slot wedge 23. The stator slot wedge 23 is made of flexible material to seal the radially inner end of the stator tooth slot 215.

[0087] 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 slot 215 to contact the rotor assembly 3, thereby avoiding the loss of cooling oil caused by the rotation of the rotor assembly 3, which is beneficial to fundamentally solve the oil stirring loss problem and improve the utilization rate of the cooling oil.

[0088] Alternatively, the radially inner end of the stator tooth slot 215 is closed, which can also avoid the loss of cooling oil caused by the rotation of the rotor assembly 3.

[0089] In an exemplary embodiment, as shown in Figure 2 , Figure 3 , Figure 6 , Figure 16 and Figure 17 The stator core 21 is provided with an oil inlet flow channel 2113, a first cooling oil channel 2141 and an oil outlet flow channel 2123 which are sequentially communicated; the oil inlet flow channel 2113 is arranged at the axial first end of the stator core 21 and is communicated with the oil inlet 1111; the oil outlet flow channel 2123 is arranged at the axial second end of the stator core 21 and is communicated with the oil outlet 1121; and the first cooling oil channel 2141 is arranged at the side of the stator core 21.

[0090] 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.

[0091] The specific shape of the first cooling oil passage 2141 is not restricted.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In one example, such as Figure 38 and Figure 39 As shown, the first cooling oil passage 2141 extends along the axial direction of the stator assembly 2 and is in a straight line, serving as an axial flow passage.

[0096] In the two examples above, the first cooling oil passage 2141 flows approximately along the axial direction of the motor, and the flow path is approximately equal to the axial length of the motor. Since the axial length of the motor is relatively small, the axial flow passage of this design can shorten the oil return cycle.

[0097] The traditional oil 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. Another path is that the cooling oil crawls along the outer circle of the stator coil 22 to the lowest point of the stator coil 22 and returns to the oil storage groove. Both paths are radial flow channels, and there is no cooling flow channel on the inner side of the stator core 21. The flow path of the cooling oil is greater than or equal to half of the circumferential dimension of the motor, and the length is relatively large. The crawling path of the cooling oil is longer than the axial flow channel, and thus the oil return period is relatively long.

[0098] 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. The annular oil channels extend along the circumference of the stator core 21 in a ring shape. The plurality of annular oil channels are arranged at intervals along the axial direction of the stator core 21. The gap oil channels are arranged between adjacent annular oil channels and can extend along the axial direction of the stator core 21 to connect the adjacent annular oil channels. In this way, the cooling oil on the side of the stator core 21 can also flow from the first axial end to the second axial end of the stator core 21. Alternatively, the first cooling oil channel 2141 is in a mesh shape, as shown in Figure 42 and Figure 43 .

[0099] 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 a wave shape, a zigzag shape, etc.

[0100] 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.

[0101] The oil inlet flow channel 2113 and the oil outlet flow channel 2123 extend along the radial direction of the stator core 21, and the structure is relatively regular, which is convenient for processing and forming. The radially outer end of the oil inlet flow channel 2113 and the radially outer end of the oil outlet flow channel 2123 are in communication with the first cooling oil channel 2141, and the first cooling oil channel 2141 is located at a position radially outward (radially outer side) 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.

[0102] In an exemplary embodiment, the oil inlet flow channel 2113 is located inside the stator core 21. The first oil inlet hole 2111 is arranged at the first axial end of the stator core 21, as shown in Figure 18 , Figure 19 and Figure 24The 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 1111. The outlet of the first oil inlet hole 2111 communicates with the oil inlet flow channel 2113.

[0103] 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 communicates 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 1121.

[0104] In this embodiment, the first oil inlet hole 2111 is provided 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 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.

[0105] The first oil outlet hole 2121 is provided 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 1121.

[0106] 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 teeth of the stator core 21, and the second oil inlet hole 2112 communicates with the oil inlet flow channel 2113.

[0107] As shown in Figure 23 The axial second end portion of the stator core 21 is provided with a second oil outlet hole 2122, which is arranged corresponding to the radial middle portion of the stator teeth of the stator core 21, and the second oil outlet hole 2122 communicates with the oil outlet flow channel 2123.

[0108] In this way, the second oil inlet hole 2112 is opposite to the middle position of the end winding 221 of the side stator coil 22, as shown in Figure 22The side end winding 221 is immersed in the cooling oil, and the cooling oil flows into the second oil inlet hole 2112 at the middle position of the side end winding 221 to cool the inside of the side end winding 221, so that the inside and outside of the side end winding 221 can be uniformly cooled, avoiding the uneven cooling caused by the oil showering 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 by the side end winding 221 can flow into the first cooling flow channel through the oil flow channel 2113, ensuring the flowability of the cooling oil.

[0109] The second oil outlet hole 2122 is opposite to the middle position of the side end winding 221 of the stator coil 22, as shown in Figure 23 The side end winding 221 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 flow channel 2123, and then cool the inside of the side end winding 221, so that the inside and outside of the side end winding 221 can be uniformly cooled, avoiding the uneven cooling caused by the oil showering 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.

[0110] 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.

[0111] 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.

[0112] 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

[0113] 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

[0114] The number of 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 arranged, as shown in Figure 18 and Figure 19

[0115] ​​​The first oil outlet holes 2121 are multiple in number and are arranged at intervals along the circumferential direction of the stator core 21, for example, uniformly.

[0116] The second oil outlet holes 2122 are multiple in number and are arranged at intervals along the circumferential direction of the stator core 21, for example, uniformly.

[0117] 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 can be arranged one-to-one (of course, they can also not be arranged one-to-one).

[0118] In one example, the multiple first oil inlet holes 2111 and the multiple second oil inlet holes 2112 are arranged at intervals along the circumferential direction of the stator core 21, as shown in Figure 18 and Figure 19

[0119] In one example, the number of second oil inlet holes 2112 is equal to the number of stator teeth and is arranged one-to-one.

[0120] In other examples, the number of second oil inlet holes 2112 is not equal to the number of stator teeth, for example, half the number of stator teeth or an integer multiple of the number of stator teeth, of course, there can be no corresponding relationship in number. The multiple second oil inlet holes 2112 can be uniformly arranged along the circumferential direction of the stator core 21.

[0121] The above schemes are all conducive to uniform distribution of cooling oil flow, thereby improving the uniformity of heat dissipation of the stator assembly 2 and avoiding the existence of heat dissipation dead zones.

[0122] In an exemplary embodiment, the axial first end of the stator core 21 is further provided with a first transition flow channel 2114 extending in a ring shape along the circumferential direction 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.

[0123] 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 the oil outlet flow channel 2123, the first oil outlet hole 2121, and the second oil outlet hole 2122.

[0124] ​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.

[0125] 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.

[0126] The first stator end plate 211 is connected to the axial first end of the core body 213, and forms the axial first end of the stator core 21.

[0127] The second stator end plate 212 is connected to the axial second end of the core body 213, and forms the axial second end of the stator core 21.

[0128] The stator sleeve 214 is sleeved on the outside of the core body 213, and the stator sleeve 214 is provided with a first cooling oil channel 2141.

[0129] In this embodiment, the stator core 21 includes the core body 213, the first stator end plate 211, the second stator end plate 212, and the 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 ends of the core body 213, and form the first axial end and the second axial end of the stator core 21, respectively. 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 on the outside of the core body 213 to form the outside portion 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 portion of the stator core 21, which is beneficial to increase the heat dissipation area of the side portion of the stator core 21 and facilitate the timely dissipation of heat generated by the stator core 21.

[0130] Of course, if a flow channel hole extending in the circumferential direction of the stator sleeve 214 is formed at the center position of the stator sleeve 214, a radial flow channel cooling scheme can also be changed, which has higher variability. If the first stator end plate 211 and the second stator end plate 212 are removed, and the length of the stator sleeve 214 is matched with the stator core 21, a shower oil scheme can be converted.

[0131] In an exemplary embodiment, the first cooling oil channel 2141 penetrates the inner side wall of the stator sleeve 214 in the radial direction of the stator core 21, as shown inFigures 36 to 43 In other words, the inner side wall of the stator sleeve 214 is provided with the first cooling oil channel 2141.

[0132] In this way, the cooling oil in the first cooling oil channel 2141 can directly contact the iron core body 213, and the heat of the iron core body 213 can be timely conducted away, thereby being conducive to further improving the heat dissipation efficiency of the stator iron core 21. Moreover, in this way, the machining difficulty of the stator sleeve 214 can be reduced, the stator sleeve 214 can be conveniently formed, and the production cost can be further reduced.

[0133] In an exemplary embodiment, the first cooling oil channel 2141 extends through the outer side wall of the stator sleeve 214 along the radial direction of the stator iron 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 channel 2141.

[0134] In this way, the cooling oil in the first cooling oil channel 2141 can directly contact the inner side wall of the housing assembly 1, and the heat of the stator iron core 21 can be timely conducted to the housing assembly 1, thereby being also conducive to further improving the heat dissipation efficiency of the stator iron core 21. Moreover, in this way, the machining difficulty of the stator sleeve 214 can be reduced, the stator sleeve 214 can be conveniently formed, and the production cost can be further reduced.

[0135] 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 channel 2141.

[0136] The first cooling oil channels 2141 located at the inner side wall and the outer side wall of the stator sleeve 214 can be mutually through, combined into one, and form a cooling oil channel extending through the inner side wall and the outer side wall of the stator sleeve 214.

[0137] The first cooling oil channels 2141 located at 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 channel 2141 located at the inner side wall of the stator sleeve 214 and the first cooling oil channel 2141 located at the outer side wall of the stator sleeve 214 can be mutually staggered. In this way, it is conducive to uniform heat dissipation and reducing the wall thickness of the stator sleeve 214.

[0138] In an exemplary embodiment, the stator sleeve 214 is an integrally formed structure formed by rolling (which can be machined by using a rolling gear with a fixed shape) or an integrally formed structure formed by die casting.

[0139] In an exemplary embodiment, 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 iron core 21 (i.e., extending along the length direction of the stator slot wedge 23), as shown in Figure 29 , Figure 33 and Figure 35The second cooling oil channel 234 is connected with the oil inlet 1111 and the oil outlet 1121.

[0140] In the present scheme, the stator slot wedge 23 is further provided with a second cooling oil channel 234. The cooling oil entering the cooling cavity 13 through the oil inlet 1111 can enter the second cooling oil channel 234 and 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 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 slot 215, thereby further improving the heat dissipation efficiency of the motor.

[0141] Since the position with the highest temperature of the stator assembly 2 is generally at the position of the stator tooth slot 215, and the existing cooling scheme often 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 slot 215. The present scheme utilizes the second cooling oil channel 234 to directly pass the cooling oil to the position of the stator tooth slot 215, so that the inner side of the stator core 21 and the part of the stator coil 22 located in the stator tooth slot 215 at this position can be cooled, thereby significantly improving the heat dissipation efficiency of the motor.

[0142] In this way, the two axial ends, the outer side and the inner side of the stator core 21 can be cooled at the same time, as shown in Figure 3 and Figure 46 which greatly improves the heat dissipation capacity of the stator core 21. Moreover, the outside and inside 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 all exchange heat with the cooling oil, greatly improving the heat dissipation capacity of the stator coil 22. As a result, the heat dissipation efficiency of the motor is also greatly improved, which can meet the heat generation requirement, so that the rotor assembly 3 does not need to assist the stator assembly 2 in heat dissipation by means of oil throwing, thereby avoiding the generation of oil stirring loss.

[0143] In an exemplary embodiment, as shown in Figure 27 , Figure 28 , Figure 2 / 9 and Figure 31 the surfaces of the two ends of the stator slot wedge 23 towards the stator coil 22 are respectively provided with a first notch 231 and a second notch 232 communicating with the second cooling oil channel 234. The first notch 231 communicates with the cooling cavity 13 located at the side of the oil inlet 1111, and the second notch 232 communicates with the cooling cavity 13 located at the side of the oil outlet 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 notches enable the cooling oil in the cooling cavity 13 to enter the second cooling oil channel 234.

[0144] Alternatively, as shown in Figure 32 , Figure 33 and Figure 35 , the stator slot wedge 23 is provided with a third notch 233 penetrating through both ends of the stator slot wedge 23 towards the surface of the stator coil 22, the third notch 233 connecting the cooling cavity 13 on the inlet oil port 1111 side and the cooling cavity 13 on the outlet oil port 1121 side, and further connecting the inlet oil port 1111 and the outlet oil port 1121.

[0145] The first notch 231 is arranged at the position of the stator slot wedge 23 corresponding to the axial first end of the stator core 21, which ensures that the cooling oil flowing through the winding 221 on this side end can enter the second cooling oil channel 234 through the first notch 231. The second notch 232 is arranged at the position of the stator slot wedge 23 corresponding to the axial second end of the stator core 21, which ensures that the cooling oil in the second cooling oil channel 234 can flow out through the winding 221 on this side end, and further flow out through the outlet oil port 1121.

[0146] Alternatively, the stator slot wedge 23 can also adopt a completely penetrating structure, which is equivalent to connecting the first notch 231 and the second notch 232 in the above-mentioned scheme to form the third notch 233, so that the cooling oil in the second cooling oil channel 234 can be ensured to enter and exit.

[0147] 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 also adopt a closed structure.

[0148] In an exemplary embodiment, a stop shoulder 2151 is arranged in the stator tooth slot 215 for stopping the stator slot wedge 23, as shown in Figure 25 and Figure 26 . The stop shoulder 2151 can play a positioning and limiting role for the stator slot wedge 23, facilitating the quick and accurate installation of the stator slot wedge 23 in place.

[0149] In an exemplary embodiment, the processing process 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 wedge 23 is uniformly installed. Then, glue is brushed on one side of the first stator end plate 211 provided with the oil inlet flow channel 2113 and one side of the second stator end plate 212 provided with the oil outlet flow channel 2123, and then the side of the first stator end plate 211 brushed with glue is tightly pressed against the front end of the core body 213, and the side of the second stator end plate 212 brushed with glue is tightly pressed against the rear end of the core body 213. Finally, the stator sleeve 214 is assembled.

[0150] In an exemplary embodiment, as shown in Figure 1As shown, the housing assembly 1 comprises 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 cooperates with the outer shell 11 to define at least part of a cooling cavity 13.

[0151] As shown, the partition 12 comprises at least one sleeve 120, which is sealingly connected to the outer shell 11. 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.

[0152] Since the housing assembly 1 comprises the outer shell 11 and the partition 12, the partition 12 is fixed in the outer shell 11 and can cooperate with the outer shell 11 to define at least part of the cooling cavity 13. In addition, since the partition 12 comprises at least one sleeve 120, and the sleeve 120 is sealingly connected to the outer shell 11, the cooling oil in the cooling cavity 13 can be prevented from leaking out of the cooling cavity 13 through the gap between the sleeve 120 and the outer shell 11, which is beneficial to preventing the cooling oil in the cooling cavity 13 from leaking and contacting the rotor assembly 3 to cause oil stirring loss.

[0153] As the sleeve 120 is adjacent to the stator coil 22, the sleeve 120 must have good insulation and anti-cutting properties, and low magnetic 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.

[0154] In an exemplary embodiment, the sleeve 120 is sealingly connected to the outer shell 11 by a sealing member 14.

[0155] The outer 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

[0156] As shown in Figure 9 , Figure 10 and Figure 11 , one end of the sleeve 120 connected to the outer 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.

[0157] As shown in Figure 12 and Figure 13 , the sealing member 14 comprises a sealing body 141 and two second sealing rings 142 connected to 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.

[0158] As shown in Figure 14 ​As shown, one of the first sealing rings 123 is inserted into the second sealing groove 143 and sealingly engages 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 engages with the groove wall of the first sealing groove 124.

[0159] In this way, the sleeve 120 and the sealing member 14 form a mutual embedding structure, forming multiple sealing surfaces, causing the leakage path of the cooling oil to be serpentine, thus increasing the length of the leakage surface, forming a labyrinth sealing structure, thus having a reliable sealing effect.

[0160] Alternatively, the sleeve 120 can also not be provided with 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 penetration path is U-shaped, also has a longer length, and also has a better sealing effect.

[0161] Of course, the sealing member 14 can also use a common 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 all require sufficient sealing space, and the thickness of the O-shaped sealing ring and the thickness of the cured sealing glue 15 will be added to the axial dimension of the motor, causing the motor to increase the requirement for assembly space.

[0162] 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 of the axial dimension of the motor, is conducive to the miniaturization of the motor, and reduces the requirement of the motor for assembly space.

[0163] In an exemplary embodiment, the first sealing groove 124 and / or the second sealing groove 143 can be provided with sealing glue 15, as shown in Figure 14 This can further improve the sealing reliability.

[0164] During assembly, the sealing glue 15 has high fluidity, and the sleeve 120 and the sealing member 14 can be extruded during assembly, extruding the sealing glue 15 into the first sealing groove 124 / second sealing groove 143, and forming a reliable seal after the sealing glue 15 is cured.

[0165] In this way, the sleeve 120 and the sealing member 14 realize double sealing by extrusion interference and glue injection, and the sealing is more reliable.

[0166] In an exemplary embodiment, as shown in Figure 1 and Figure 2As shown, the shell 11, the partition 12 and the stator assembly 2 enclose the cooling cavity 13, the sleeve 120 is provided in two, one end of the sleeve 120 is sealingly connected with the shell 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.

[0167] The scheme utilizes the shell 11, the partition 12 and the stator assembly 2 to enclose the cooling cavity 13, and only relatively short sleeves 120 need to be respectively arranged on the axial two sides of the stator core 21. Compared with arranging an entire sleeve 120 to connect the axial two ends of the shell 11, the scheme is beneficial to shorten the total length of the sleeve 120, save the material of the sleeve 120, and thus reduce the production cost, and can also avoid the sleeve 120 penetrating through the entire air gap.

[0168] In the scheme, the inner side wall of the stator core 21 participates in the enclosure of the cooling cavity 13, and thus 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 two axial end portions and the radial inner portion and the radial outer portion of the stator core 21 are all provided with cooling oil channels, the stator assembly 2 also has relatively high heat dissipation efficiency.

[0169] On the other hand, the sleeve 120 is also sealingly connected 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 connecting part of the sleeve 120 and the stator core 21, and thus is beneficial to avoid the oil stirring loss.

[0170] 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, the stator slot wedge 23 is fixed at the radial inner end of the stator tooth slot 215, and the stator slot wedge 23 is a heat-conducting member. For the scheme that the radial inner end of the stator tooth slot 215 is open and the stator slot wedge 23 is a sealing member 14, the stator slot wedge 23 also seals the inner side of the stator core 21. For the scheme that 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.

[0171] 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, and thus can fundamentally avoid the occurrence of oil stirring loss.

[0172] 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 with 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.

[0173] 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 the sealing glue 15.

[0174] In this way, the sleeve 120 and the stator core 21 also form a mutually nested labyrinth sealing structure, and the sealing glue 15 can ensure sealing reliability, so as to effectively prevent the cooling oil from leaking to the rotor assembly 3 and avoid oil stirring loss.

[0175] In this way, the axial end portions of the sleeve 120 and the stator core 21 can also be double-sealed by extrusion interference and glue injection, and the sealing is more reliable.

[0176] Among them, the first stator end plate 211 forms the first axial end portion of the stator core 21, and the second stator end plate 212 forms the second axial end portion 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 sealingly connected with the two sleeves 120 through the labyrinth sealing scheme.

[0177] Alternatively, the sleeve 120 can also not be provided with two third sealing rings 125, and the end portion of the sleeve 120 is directly inserted into the second mounting groove 216 to achieve sealing cooperation, at this time the penetration path is U-shaped, also has a longer length, and also has a better sealing effect.

[0178] In an exemplary embodiment, the housing 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 sealingly connected with the housing 11.

[0179] This scheme utilizes the housing 11 and the partition 12 to form the cooling cavity 13, so that the stator assembly 2 and the rotor assembly 3 are completely separated by the partition 12, which can fundamentally avoid oil stirring loss. Moreover, the stator assembly 2 can be completely located in the cooling cavity 13, so that the stator assembly 2 can be completely immersed in the cooling oil, thereby having a higher heat dissipation efficiency.

[0180] In an exemplary embodiment, as shown in Figure 1 The housing 11 includes a casing 111 and an end cover 112.

[0181] Among them, 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.

[0182] In one example, the casing 111 has an open rear end, and an end cover 112 is arranged at the rear end of the casing 111. An oil inlet 1111 is arranged at the front end of the casing 111, and an 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, and the end cover 112 is also provided with a first mounting groove 113, as shown in Figure 2 、 Figure 6 and Figure 8

[0183] The sleeve 120 that is sealingly connected with the end cover 112 is referred to as a first sleeve 121, and the sleeve 120 that is sealingly 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.

[0184] In this way, the end cover 112, the first sleeve 121, the casing 111, the second sleeve 122, and the stator core 21 form a cooling cavity 13, and the cooling cavity 13 is filled with cooling oil. Most of the stator assembly 2 (except the inner side wall of the stator core 21) can be immersed in the cooling cavity 13, and the cooling oil flows in the cooling cavity 13. The contact oil cooling is adopted, and the heat of the stator assembly 2 is removed in time, which greatly improves the heat dissipation efficiency of the motor compared with the oil showering scheme.

[0185] In this way, the end cover 112, the first sleeve 121, the casing 111, the second sleeve 122, and the stator core 21 form a cooling cavity 13, and the cooling cavity 13 is filled with cooling oil. Most of the stator assembly 2 (except the inner side wall of the stator core 21) can be immersed in the cooling cavity 13, and the cooling oil flows in the cooling cavity 13. The contact oil cooling is adopted, and the heat of the stator assembly 2 is removed in time, which greatly improves the heat dissipation efficiency of the motor compared with the oil showering scheme.

[0186] Of course, the casing can also have open ends, and the shell includes the casing and two end covers, and the two end covers are connected to 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 have an open front end, and the end cover is a front end cover.

[0187] 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 at intervals along the circumference of the motor. The number of oil outlets 1121 is multiple, and the multiple oil outlets 1121 are arranged at intervals 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.

[0188] ​In one example, the number of oil inlets 1111 is two, as shown in Figure 1 and Figure 4 two oil inlets 1111 are symmetrically arranged. The number of oil outlets 1121 is two, and the two oil outlets 1121 are symmetrically arranged.

[0189] In an exemplary embodiment, as shown in Figure 2 , 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 cooled efficiently by cooling oil, ensuring the heat dissipation efficiency of the motor.

[0190] In an exemplary embodiment, as shown in Figure 2 , Figure 3 and Figure 4 , the casing 111 is also 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.

[0191] 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.

[0192] In one 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.

[0193] In an exemplary embodiment, the water cooling channel 1112 is coiled around the casing 111 in a spiral shape, as shown in Figure 2 and Figure 3 . Alternatively, the cross section of the water cooling channel 1112 is in the shape of a circular ring, and the side wall of the casing 111 is arranged in a hollow structure or an inner and outer nested structure.

[0194] 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.

[0195] In one example, the water in 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.

[0196] Of course, the water cooling channel 1112 can not be provided, as shown in Figure 5 and Figure 6 as shown.

[0197] The embodiment of the present application also provides a power assembly, comprising the motor of any one of the above embodiments, thus having all the beneficial effects of any one of the above embodiments, which will not be repeated here.

[0198] 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 .

[0199] The cooling oil, after cooling the rotor assembly 3 and the stator assembly 2 of the motor by the oil pump 5, flows to the oil cooler 6 through the pipeline, and returns to the oil pump 5 after being cooled by the oil cooler 6, so as to realize the circulation of the oil circuit.

[0200] 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 .

[0201] The water pump 7 injects low-temperature cooling water into the motor controller 4, and the cooling water, after cooling the motor controller 4, enters the water cooling channel 1112 of the motor housing 111 to cool the stator assembly 2. 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, so as to realize the circulation of the water circuit.

[0202] As shown in Figure 49 , the embodiment of the present application also provides a vehicle 100, comprising wheels, a transmission device and the motor of any one of the above embodiments, thus having all the beneficial effects of any one of the above embodiments, which will not be repeated here.

[0203] In an example, the motor can be, but is not limited to, a driving motor or a generator or an auxiliary driving motor.

[0204] In an example, the motor can drive the wheels to rotate through the transmission device.

[0205] In the description in the present application, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "edge", "opposite", "four corners", "periphery", "port structure" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and thus cannot be understood as indicating or implying that the structure indicated has a specific orientation, is constructed and operated in a specific orientation, and thus cannot be understood as limiting the present application.

[0206] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", "assembly" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; the terms "installation", "connection", "fixed connection" can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. 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] Although the embodiments of the present application are disclosed as above, the content described is only the embodiments adopted for the purpose of facilitating the understanding of the present application, and is not intended to limit the present application. Any modification and change in the form and details can be made by any person skilled in the art without departing from the spirit and scope of the present application disclosed, but the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. An electric machine characterized in that, The electric machine comprises: a housing assembly provided with an oil inlet and an oil outlet; a stator assembly arranged in the housing assembly; and a rotor assembly rotatably arranged in the stator assembly; wherein the housing assembly is provided with a cooling cavity in communication with the oil inlet and the oil outlet, and the cooling cavity is used for flowing cooling oil to cool the stator assembly; the rotor assembly is spaced apart from the cooling cavity to limit the cooling oil in the cooling cavity from contacting the rotor 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 define at least part of the cooling cavity; the partition comprises at least one sleeve, the sleeve is sealingly connected to the outer shell by a sealing member; the outer shell is provided with a first mounting groove, and the sealing member is mounted 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 body and two second sealing rings connected to 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 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 located at least partially in the cooling cavity and provided with a stator slot; and a stator coil located in the cooling cavity and fixed to the stator slot.

3. The electric machine according to claim 2, wherein a radially inner end of the stator slot is open, and a stator slot wedge made of flexible material is arranged at the radially inner end of the stator slot to seal the radially inner end of the stator slot; or a radially inner end of the stator slot is closed.

4. The electric machine according to any one of claims 1 to 3, wherein sealing glue is arranged in the first sealing groove and / or the second sealing groove.

5. The electric machine according to any one of claims 1 to 3, wherein the outer shell, the partition and the stator assembly cooperatively define the cooling cavity, the number of the 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 an axial end of a stator core of the stator assembly.

6. The electric machine according to claim 5, wherein the axial end 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 sealingly cooperates with the groove wall of the second mounting groove; sealing glue is arranged in the second mounting groove and / or the third sealing groove.

7. The electric machine according to any one of claims 1 to 3, wherein ​ The shell and the partition wall surround the cooling cavity, the sleeve is one in number, the sleeve is sleeved on the inner side of the stator assembly, and two ends of the sleeve are sealingly connected with the shell.

8. The electric machine of any one of claims 1 to 3, wherein, The shell comprises: A shell, one end of which is provided as an open end; and An end cover, which is arranged at the open end of the shell and is fixedly connected with the shell; Among them, one of the shell and the end cover is provided with the oil inlet, and the other is provided with the oil outlet.

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

10. A vehicle characterized by comprising: An electric machine comprising any one of the electric machines of claims 1 to 8.

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