Motor assembly and vehicle

Abstract

The utility model provides a motor assembly and a vehicle, and relates to the vehicle part technology field, the motor assembly comprises a housing, a stator iron core, a first sealing member, a second sealing member and a stator winding, the first sealing member and the second sealing member are respectively arranged at two axial ends of the stator iron core, the first sealing member, the stator iron core and the housing form a first cavity, and the stator winding is arranged in the first cavity. A second cavity is defined by the second sealing piece, the stator iron core and the shell. The stator core is provided with a stator groove and a first cooling oil channel, the oil inlet ends of the stator groove and the first cooling oil channel are respectively communicated with the first cavity, and the oil outlet ends of the stator groove and the first cooling oil channel are respectively communicated with the second cavity. Thus, after entering the first cavity, cooling oil can flow into the second cavity through the stator groove and the first cooling oil duct, the cooling oil in the first cavity and the second cavity can soak and cool the end winding, the cooling oil in the stator groove and the first cooling oil duct can cool the internal winding, and the cooling effect of the stator winding is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parts, and in particular, to an oil-immersed cooling structure for a motor, a motor assembly and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the requirements for the performance of motors, such as heat dissipation, are getting higher and higher. At present, the main methods for motor heat dissipation are water cooling and oil cooling. Among them, the water cooling method is to set a water channel around the outer ring of the stator core, and use the cooling water flowing in the water channel to take away the heat on the surface of the stator core. However, this heat dissipation method transfers the heat generated by the winding to the stator core, then conducts it to the water channel, and then takes away the heat through the water flow to achieve indirect heat dissipation of the winding. Therefore, the heat dissipation effect is poor; the oil cooling method is to open oil grooves extending along the axial direction of the stator core on the surface of the stator core, and the oil liquid is sprayed along the oil grooves to the end windings. Although this method can cool the surface of the stator core and the end windings, the heat dissipation effect on the inner windings of the stator core is poor. Summary of the Utility Model

[0003] The problem to be solved by the utility model is: how to improve the heat dissipation effect of the stator winding.

[0004] To solve the above problems, the utility model provides a motor assembly and a vehicle.

[0005] In a first aspect, the utility model provides a motor assembly, which includes a housing and a stator core, a sealing component, and a stator winding arranged in the housing. The sealing component includes a first seal and a second seal. The first seal and the second seal are in a ring structure and are respectively located at both ends of the stator core along its axial direction. The first seal, the stator core and the housing enclose a first cavity, and the second seal, the stator core and the housing enclose a second cavity. The housing is provided with an oil inlet hole and an oil outlet hole, and the oil inlet hole and the oil outlet hole are respectively communicated with the first cavity and the second cavity;

[0006] The stator core is provided with a stator slot and a first cooling oil channel that runs through axially. The stator winding is arranged at the stator slot, and both ends of the stator winding along the axial direction of the stator core are respectively located in the first cavity and the second cavity. The first cooling oil channel is located on one side of the stator slot close to the central axis of the stator core, and the inlet ends of the stator slot and the first cooling oil channel are respectively communicated with the first cavity, and the outlet ends of the stator slot and the first cooling oil channel are respectively communicated with the second cavity.

[0007] Optionally, the housing includes an outer shell provided with an opening and an end cap covering the opening. The oil inlet hole and the oil outlet hole are both provided on the outer shell. The outer shell includes a bottom wall disposed opposite to the opening. Two ends of the first seal along its axial direction are respectively abutted against the first end face of the stator core and the bottom wall. Two ends of the second seal along its axial direction are respectively abutted against the second end face of the stator core and the end cap. And the first cavity is jointly formed by the first end face of the stator core, the bottom wall and the first seal. The second cavity is jointly formed by the second end face of the stator core, the end cap and the second seal. Wherein, the first end face and the second end face of the stator core are respectively the end faces at both ends of the stator core along its axial direction, and the first end face of the stator core is close to the bottom wall.

[0008] Optionally, the orthographic projection of the first seal on the first end face of the stator core is located on one side of the first cooling oil passage close to the central axis of the stator core, and / or the orthographic projection of the second seal on the second end face of the stator core is located on one side of the first cooling oil passage close to the central axis of the stator core.

[0009] Optionally, the motor assembly further includes a first sealing structure. One end of the first seal close to the bottom wall is hermetically connected to the bottom wall through the first sealing structure;

[0010] and / or, the motor assembly further includes a second sealing structure. One end of the second seal close to the end cap is hermetically connected to the end cap through the second sealing structure.

[0011] Optionally, there are a plurality of the first cooling oil passages. The plurality of first cooling oil passages are arranged at intervals along the circumferential direction of the stator core, and the first cooling oil passages are arranged in one-to-one correspondence with the stator slots.

[0012] Optionally, the stator slot and the corresponding first cooling oil passage communicate with each other in the radial direction of the stator core, and the communication part between the stator slot and the corresponding first cooling oil passage is blocked by a slot wedge.

[0013] Optionally, the stator core is further provided with a second cooling oil passage axially penetrating therethrough. The second cooling oil passage is located on one side of the stator slot away from the central axis of the stator core, and the oil inlet end and the oil outlet end of the second cooling oil passage are respectively communicated with the first cavity and the second cavity.

[0014] Optionally, the second cooling oil passages are arranged in one-to-one correspondence with the stator slots, and the second cooling oil passages are arranged at intervals in the radial direction of the stator core with respect to the corresponding stator slots.

[0015] Optionally, a first limiting protrusion is provided on the side of the bottom wall close to the stator core, and a second limiting protrusion is provided on the side of the end cover close to the stator core. The first limiting protrusion and the second limiting protrusion are in an annular structure. The first seal is located in the space surrounded by the first limiting protrusion, and the second seal is located in the space surrounded by the second limiting protrusion. Moreover, the distance between the first limiting protrusion and the second limiting protrusion is greater than the dimension of the stator winding in the axial direction of the stator core.

[0016] In a third aspect, the present utility model provides a vehicle, including the motor assembly as described above.

[0017] The beneficial effects of the motor assembly of the present utility model are as follows: The first seal and the second seal can be respectively arranged at the two axial ends of the stator core. The first seal, the stator core and the housing enclose a first cavity, and the second seal, the stator core and the housing enclose a second cavity. At the same time, an oil inlet hole communicating with the first cavity and an oil outlet hole communicating with the second cavity are provided on the housing. A first cooling oil passage is provided on the stator core, and the oil inlet end and the oil outlet end of the first cooling oil passage are respectively communicated with the first cavity and the second cavity. The oil inlet end and the oil outlet end of the stator slot are respectively communicated with the first cavity and the second cavity, so that the two ends of the stator winding along the axial direction of the stator core are respectively located in the first cavity and the second cavity. In this way, after the cooling oil enters the first cavity from the oil inlet hole of the housing, it can flow into the second cavity through the stator slot and the first cooling oil passage, and then flow out of the motor from the oil outlet hole of the housing, facilitating the circulating cooling of the cooling oil. Moreover, the cooling oil in the first cavity and the second cavity can soak and cool the end windings of the stator winding, and the cooling oil flowing into the stator slot and the first cooling oil passage can cool the inner windings of the stator winding, effectively improving the cooling effect of the stator winding. In addition, by arranging the first cooling oil passage inside the stator slot in the radial direction, the cooling oil entering the first cooling oil passage can cool the radial inner side with a relatively large heat generation amount of the stator winding, further improving the cooling effect on the inner winding. Description of the Drawings

[0018] Figure 1 is a schematic cross-sectional structure view of the motor assembly in an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 a partial enlarged view at A in

[0020] Figure 3 is an exploded structure view of the motor oil-immersion cooling structure equipped with a stator winding in an embodiment of the present utility model;

[0021] Figure 4 is a schematic structure view of the housing in an embodiment of the present utility model;

[0022] Figure 5 It is a schematic structural diagram of another perspective of the housing in the embodiment of the present utility model;

[0023] Figure 6 It is a schematic structural diagram of the stator core in the embodiment of the present utility model;

[0024] Figure 7 is Figure 6 The partial enlarged view at position B in

[0025] Figure 8 It is a schematic assembly structural diagram of the stator core, insulating paper and slot wedge in the embodiment of the present utility model;

[0026] Figure 9 is Figure 8 The partial enlarged view at position C in

[0027] Explanation of reference numerals:

[0028] 1. Housing; 11. Outer shell; 111. Side wall; 112. Bottom wall; 113. Oil inlet hole; 114. Oil outlet hole; 115. Open end; 116. First limiting protrusion; 12. End cover; 121. Second limiting protrusion; 2. Stator core; 21. Stator slot; 22. First cooling oil channel; 23. Second cooling oil channel; 24. Limiting groove; 3. Sealing assembly; 31. First seal; 32. Second seal; 4. Stator winding; 5. First cavity; 6. Second cavity; 71. First sealing structure; 72. Second sealing structure; 8. Slot wedge; 9. Insulating paper. Detailed implementation manners

[0029] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following will describe the specific embodiments of the present utility model in detail with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0030] The term "including" and its variations used in this article are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present utility model are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] It should be noted that the modifications of “one” and “plurality” mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as “one or more”.

[0032] In the related art, there are two main ways of heat dissipation for motors: water cooling and oil cooling. The water cooling method is to set a circle of water channels on the outer ring of the stator core, and use the cooling water flowing in the water channel to take away the heat from the surface of the stator core. However, this heat dissipation method transfers the heat generated by the winding to the stator core, and then conducts it to the water channel, and then uses the water flow to take away the heat to achieve indirect heat dissipation of the winding. Therefore, the heat dissipation effect is poor. The oil cooling method is to open an oil groove on the surface of the stator core that extends along the axial direction of the stator core, and the oil is sprayed along the oil groove to the end winding. Although this method can cool the surface and end winding of the stator core, it has a poor heat dissipation effect on the winding inside the stator core.

[0033] In view of the problems existing in the above-mentioned related technologies, the utility model provides a motor assembly and a vehicle.

[0034] Combination Figures 1 to 3 As shown, an embodiment of the utility model provides a motor assembly, including a housing 1 and a stator core 2, a sealing assembly 3, and a stator winding 4 arranged in the housing 1. The sealing assembly 3 includes a first sealing member 31 and a second sealing member 32. The first sealing member 31 and the second sealing member 32 are annular structures and are respectively arranged at two ends of the stator core 2 along its axial direction. The first sealing member 31, the stator core 2 and the housing 1 form a first cavity 5, and the second sealing member 32, the stator core 2 and the housing 1 form a second cavity 6. The housing 1 is provided with an oil inlet hole 113 and an oil outlet hole 114. The first cavity 5 and the second cavity 6 are respectively connected to the oil inlet hole 113 and the oil outlet hole 114;

[0035] The stator core 2 is provided with stator slots 21 and a first cooling oil passage 22 penetrating axially therethrough. The stator winding 4 is installed at the stator slots 21, and both axial ends of the stator winding 4 along the stator core 2 are located in the first cavity 5 and the second cavity 6 respectively. The first cooling oil passage 22 is located on one side of the stator slots 21 close to the central axis of the stator core 2, and the oil inlet ends of the stator slots 21 and the first cooling oil passage 22 are respectively communicated with the first cavity 5, and the oil outlet ends of the stator slots 21 and the first cooling oil passage 22 are respectively communicated with the second cavity 6.

[0036] Specifically, the housing 1 of the motor assembly is generally in a hollow cylindrical structure. The stator core 2, the sealing assembly 3 and the stator winding 4 are installed inside the housing 1. The stator winding 4 is generally in a ring structure as a whole, and it includes an inner winding and an end winding. The inner winding of the stator winding 4 is installed in the stator slots 21 of the stator core 2, and the end winding of the stator winding 4 extends outside the stator core 2. The first seal 31 and the second seal 32 of the sealing assembly 3 are respectively arranged at both axial ends of the stator core 2 and are located in the space surrounded by the stator winding 4. The stator winding 4 is usually an enameled wire winding, and this enameled wire winding can be a flat wire winding. At this time, the motor assembly is usually a flat wire motor. Moreover, the flat wire winding is usually assembled by the insertion + welding method, that is, the stator winding 4 is first made into a U-shaped or U-shaped-like shape, and then the U-shaped or U-shaped-like winding is inserted into the stator slots 21 from one end of the stator slots 21, and then the ends of the winding are welded at the other end of the stator slots 21; the enameled wire winding can also be a round wire winding. At this time, the motor assembly is usually a round wire motor, and the round wire winding is usually installed in the stator slots 21 by a winding method.

[0037] More specifically, the first seal 31 and the second seal 32 are generally in an annular structure. The two axial ends of the first seal 31 are respectively abutted against the housing 1 and the first end of the stator core 2, and the two axial ends of the second seal 32 are respectively abutted against the housing 1 and the second end of the stator core 2. That is to say, the first seal 31 is sandwiched between the first end of the housing 1 and the first end of the stator core 2, and the second seal 32 is sandwiched between the second end of the housing 1 and the second end of the stator core 2. Herein, the first end and the second end of the housing 1 are respectively the two axial ends of the housing 1 along the axis of the stator core 2, and the first end and the second end of the stator core 2 are respectively the two axial ends of the stator core 2 along its axis. Moreover, the first seal 31, the stator core 2 and the housing 1 jointly enclose a first cavity 5, and the second seal 32, the stator core 2 and the housing 1 jointly enclose a second cavity 6. The first cavity 5 and the second cavity 6 are respectively communicated with the oil inlet hole 113 and the oil outlet hole 114 on the housing 1. In addition, a first cooling oil passage 22 is also provided on the stator core 2, and the first cooling oil passage 22 is axially penetrated along the stator core 2. Since the heat generation amount on the radially inner side of the stator winding 4 (i.e., the side of the stator winding 4 close to the central axis of the stator core 2) is generally greater than that on the radially outer side (i.e., the side of the stator winding 4 far from the central axis of the stator core 2), the first cooling oil passage 22 is usually arranged on the radially inner side of the stator slot 21, that is, the side of the stator slot 21 close to the central axis of the stator core 2, so that the cooling oil in the first cooling oil passage 22 can cool the stator winding 4 on the radially inner side of the stator winding 4. The first cooling oil passage 22 can be a closed cavity structure independent of the stator slot 21, that is, the inner wall of the first cooling oil passage 22 is in a closed annular structure, so that the first cooling oil passage 22 is not communicated with the stator slot 21; the first cooling oil passage 22 can also be a semi-surrounding cavity structure communicated with the stator slot 21. At this time, a slot wedge 8 is usually required to be arranged at the communication position between the first cooling oil passage 22 and the stator slot 21, so that the first cooling oil passage 22 and the slot wedge 8 jointly enclose a closed cavity structure, which is not specifically limited herein. Moreover, the oil inlet ends of the stator slot 21 and the first cooling oil passage 22 are respectively communicated with the first cavity 5, and the oil outlet ends of the stator slot 21 and the first cooling oil passage 22 are respectively communicated with the second cavity 6.

[0038] When cooling the motor assembly with cooling oil, the cooling oil enters the first cavity 5 from the oil inlet hole 113 of the housing 1, so that the end winding at one end of the stator winding 4 is immersed in the cooling oil. Moreover, the cooling oil in the first cavity 5 can flow into the stator slots 21 to cool the inner winding of the stator winding 4. At the same time, the cooling oil in the first cavity 5 can also flow into the first cooling oil channel 22 to cool the inner winding of the stator winding 4 on the radial inner side of the stator winding 4. Then, the cooling oil flows into the second cavity 6 from the oil outlet ends of the stator slots 21 and the first cooling oil channel 22, so that the end winding at the other end of the stator winding 4 is also immersed in the cooling oil, thereby performing oil immersion cooling on the end winding of the stator winding 4. In addition, the cooling oil in the second cavity 6 can flow out of the motor from the oil outlet hole 114 of the housing 1, and then flow into the motor from the oil inlet hole 113 after being cooled, so that the cooling oil can circulate and cool the motor.

[0039] In the motor assembly of this embodiment, the first seal 31 and the second seal 32 can be respectively arranged at the axial two ends of the stator core 2, and the first seal 31, the stator core 2 and the housing 1 enclose the first cavity 5, and the second seal 32, the stator core 2 and the housing 1 enclose the second cavity 6. At the same time, an oil inlet hole 113 communicating with the first cavity 5 and an oil outlet hole 114 communicating with the second cavity are arranged on the housing 1. A first cooling oil channel 22 is arranged on the stator core 2, and the oil inlet end and the oil outlet end of the first cooling oil channel 22 are respectively communicated with the first cavity 5 and the second cavity 6. The oil inlet end and the oil outlet end of the stator slot 21 are respectively communicated with the first cavity 5 and the second cavity 6, so that the two ends of the stator winding 4 along the axis of the stator core 2 are respectively located in the first cavity 5 and the second cavity 6. In this way, after the cooling oil enters the first cavity 5 from the oil inlet hole 113 of the housing 1, it can flow into the second cavity 6 through the stator slots 21 and the first cooling oil channel 22, and then flow out of the motor from the oil outlet hole 114 of the housing 1, so as to facilitate the circulation cooling of the cooling oil. Moreover, the cooling oil in the first cavity 5 and the second cavity 6 can perform immersion cooling on the end windings of the stator winding 4, and the cooling oil flowing into the stator slots 21 and the first cooling oil channel 22 can cool the inner winding of the stator winding 4, effectively improving the cooling effect of the stator winding 4. In addition, by arranging the first cooling oil channel 22 on the radial inner side of the stator slot 21, the cooling oil entering the first cooling oil channel 22 can cool the radial inner side with relatively large heat generation of the stator winding 4 to further improve the cooling effect on the inner winding.

[0040] Optionally, in combination with Figure 2 , Figure 4 and Figure 5As shown in the figure, the housing 1 includes a housing 11 with an opening 115 and an end cover 12 covering the opening 115. The oil inlet hole 113 and the oil outlet hole 114 are both provided on the housing 11. The housing 11 includes a bottom wall 112 opposite to the opening 115. The two ends of the first seal 31 are respectively abutted against the first end face of the stator core 2 and the bottom wall 112, and the two ends of the second seal 32 are respectively abutted against the second end face of the stator core 2 and the end cover 12. The first cavity 5 is jointly formed by the first end face of the stator core 2, the bottom wall 112 and the first seal 31, and the second cavity 6 is jointly formed by the second end face of the stator core 2, the end cover 12 and the second seal 32. Among them, the first end face and the second end face of the stator core 2 are respectively the end faces at both ends of the stator core 2 along its axial direction, and the first end face of the stator core 2 faces the bottom wall 112.

[0041] Specifically, the housing 1 includes two parts of structures, namely the housing 11 and the end cover 12. The housing 11 is generally a hollow cylindrical structure with one end open. The stator core 2, the sealing assembly 3 and the stator winding 4 are all arranged inside the housing 11, and the end cover 12 is generally covered at the opening 115 of the housing 11 and is bolted to the housing 11. The housing 11 mainly includes an annular side wall 111 and a bottom wall 112 opposite to the opening 115. The oil inlet hole 113 and the oil outlet hole 114 are both arranged on the side wall 111. The first end face of the stator core 2 is the end face of the first end of the stator core 2, the second end face of the stator core 2 is the end face of the second end of the stator core 2, and the first cavity 5 is generally jointly formed by the bottom wall 112, the side wall 111, the first end face of the stator core 2 and the first seal 31, and the second cavity 6 is generally jointly formed by the end cover 12, the side wall 111, the second end face of the stator core 2 and the second seal 32.

[0042] In this alternative embodiment, by dividing the housing 1 of the motor into two parts, namely the housing 11 and the end cover 12, on the one hand, it is convenient to load the stator core 2, the sealing assembly 3 and the stator winding 4 into the housing 1 from the opening 115 of the housing 11 and use the end cover 12 for encapsulation after all components are assembled in place. On the other hand, it is convenient to manufacture the housing 1 in sections, thereby reducing the manufacturing difficulty and improving the production efficiency.

[0043] Optionally, in combination with Figure 2 、 Figure 3 and Figure 4As shown, a first limiting protrusion 116 is provided on the side of the bottom wall 112 close to the stator core 2, and a second limiting protrusion 121 is provided on the side of the end cover 12 close to the stator core 2. The first limiting protrusion 116 and the second limiting protrusion 121 are of an annular structure. The first seal 31 is located in the space enclosed by the first limiting protrusion 116, and the second seal 32 is located in the space enclosed by the second limiting protrusion 121. Moreover, the distance between the first limiting protrusion 116 and the second limiting protrusion 121 is greater than the dimension of the stator winding 4 in the axial direction of the stator core 2.

[0044] In this alternative embodiment, the first limiting protrusion 116 and the second limiting protrusion 121 are generally circular annular protrusion structures. Moreover, the distance between the first limiting protrusion 116 and the second limiting protrusion 121 is generally slightly greater than the dimension of the stator winding 4 in the axial direction of the stator core 2. In this way, the stator winding 4 can be limited axially by the first limiting protrusion 116 and the second limiting protrusion 121, preventing the stator winding 4 from shaking greatly axially during the operation of the motor.

[0045] Optionally, as shown in Figure 2 the positive projection of the first seal 31 on the first end face of the stator core 2 is located on the side of the first cooling oil passage 22 close to the central axis of the stator core 2, and / or the positive projection of the second seal 32 on the second end face of the stator core 2 is located on the side of the first cooling oil passage 22 close to the central axis of the stator core 2.

[0046] In this alternative embodiment, the positive projection of the first seal 31 on the first end face of the stator core 2 is located on the side of the first cooling oil passage 22 close to the central axis of the stator core 2, and the positive projection of the second seal 32 on the second end face of the stator core 2 is located on the side of the first cooling oil passage 22 close to the central axis of the stator core 2. In this way, it is ensured that the oil inlet end of the first cooling oil passage 22 is completely located in the first cavity 5, and the oil outlet end of the first cooling oil passage 22 is completely located in the second cavity 6. While increasing the oil inlet volume of the first cooling oil passage 22, the outer diameter dimension of the sealing assembly 3 can be reduced, thereby reducing the consumables of the sealing assembly 3 and lowering the production cost.

[0047] Furthermore, the positive projection of the first seal 31 on the first end face of the stator core 2 is located on the side of the inner wall of the stator core 2 away from the central axis of the stator core 2, and / or the positive projection of the second seal 32 on the second end face of the stator core 2 is located on the side of the inner wall of the stator core 2 away from the central axis of the stator core 2. In this way, on the basis of ensuring that the oil inlet end of the first cooling oil passage 22 is completely located in the first cavity 5 and the oil outlet end of the first cooling oil passage 22 is completely located in the second cavity 6, the consumables of the sealing assembly 3 can be further reduced, thereby further lowering the production cost.

[0048] Optionally, in combination with Figure 2 As shown, the motor assembly further includes a first sealing structure 71. One end of the first seal 31 close to the bottom wall 112 is sealingly connected to the bottom wall 112 through the first sealing structure 71;

[0049] And / or, the motor assembly further includes a second sealing structure 72. One end of the second seal 32 close to the end cover 12 is sealingly connected to the end cover 12 through the second sealing structure 72.

[0050] In this optional embodiment, the first sealing structure 71 and the second sealing structure 72 can be sealing rings or sealants. In practical applications, they can be selected and designed according to needs, and no specific limitations are made here. When the first sealing structure 71 and the second sealing structure 72 are sealing rings, the sealing between the sealing ring and the first seal 31 / second seal 32 can be end face sealing. At this time, the sealing ring is clamped between the bottom wall 112 and the end face of the first seal 31, or between the end cover 12 and the end face of the second seal 32; the sealing between the sealing ring and the first seal 31 / second seal 32 can also be radial sealing. At this time, the sealing ring is usually sleeved outside the first seal 31 / second seal 32, and a ring-shaped boss is usually provided on the bottom wall 112, and the ring-shaped boss is sleeved outside the sealing ring. In this way, the first sealing structure 71 is used to seal the connection between the first seal 31 and the bottom wall 112 to improve the sealing performance of the first cavity 5, prevent the cooling oil from penetrating into the air gap from the connection between the first seal 31 and the bottom wall 112, thereby reducing the motor oil agitation loss and improving the motor efficiency.

[0051] Furthermore, in combination with Figure 2 As shown, the bottom wall 112 of the housing 11 is provided with a first annular groove, and the first sealing structure 71 is arranged in the first annular groove; and / or, the end cover 12 is provided with a second annular groove, and the second sealing structure 72 is arranged in the second annular groove. In this way, not only can the annular groove be used to limit and position the installation of the first sealing structure 71 / second sealing structure 72, but also the occupied space of the first sealing structure 71 and / or the second sealing structure 72 can be reduced, thereby reducing the axial dimension of the motor and facilitating the layout.

[0052] Optionally, in combination with Figure 6 and Figure 7 As shown, there are a plurality of first cooling oil channels 22. The plurality of first cooling oil channels 22 are arranged at intervals along the circumferential direction of the stator core 2, and the first cooling oil channels 22 are arranged in one-to-one correspondence with the stator slots 21.

[0053] In this alternative embodiment, the number of stator slots 21 is the same as that of the first cooling oil channels 22, and they are arranged in one-to-one correspondence, that is, one first cooling oil channel 22 is provided on the radially inner side of each stator slot 21. In this way, the cooling area of the inner winding of the stator winding 4 and the stator core 2 can be increased, ensuring that the stator winding 4 in each stator slot 21 can further have its heat taken away by the cooling oil in the first cooling oil channel 22, thereby further improving the cooling effect of the stator winding 4.

[0054] In other embodiments, the first cooling oil channels 22 can be provided in multiple numbers, and the number of the first cooling oil channels 22 is less than that of the stator slots 21. For example, the width of the first cooling oil channel 22 (i.e., the dimension of the first cooling oil channel 22 in the circumferential direction of the stator core 2) can be set larger, such that every two stator slots 21 correspond to one first cooling oil channel 22; it can also be that the first cooling oil channel 22 is provided as an integral circular groove structure. In practical applications, it can be selected and designed according to needs, and no specific limitation is made here.

[0055] Furthermore, as shown in Figure 8 the stator slots 21 are arranged to extend radially along the stator core 2. Compared with the stator slots 21 being radially inclined with respect to the stator core 2 (i.e., the stator slots 21 being skewed slots), when assembling, there is no need to consider the installation direction of the skewed slots, thus playing a certain anti-fooling role and further improving the assembly efficiency.

[0056] Optionally, as shown in Figure 8 and Figure 9 the stator slots 21 and the corresponding first cooling oil channels 22 are in radial communication in the stator core 2, and the communication part between the stator slots 21 and the corresponding first cooling oil channels 22 is blocked by a slot wedge 8.

[0057] In this alternative embodiment, one side of the stator slot 21 close to the central axis of the stator core 2 is in communication with one side of the corresponding first cooling oil channel 22 far from the central axis of the stator core 2 to form a winding slot for installing the stator winding 4. In this way, the winding slot can be divided into the stator slot 21 and the first cooling oil channel 22 by arranging the slot wedge 8 in the winding slot of the stator core 2, so as to reduce the modification of the original structure of the stator core 2, thereby reducing the production difficulty and production cost. Moreover, the setting of the slot wedge 8 can also prevent the stator winding 4 from shifting or vibrating during high-speed rotation, thus ensuring the stability and reliability of the motor.

[0058] Furthermore, as shown in Figure 7As shown, two slot walls of the stator slot 21 along the circumferential direction of the stator core 2 are respectively provided with limiting slots 24, and the limiting slots 24 are located at the connection between the stator slot 21 and the first cooling oil duct 22. Both ends of the slot wedge 8 along the circumferential direction of the stator core 2 are respectively embedded in the two limiting slots 24. In this way, the limiting slots 24 can be used to limit and fix the slot wedge 8 in the radial direction of the stator core 2, preventing the slot wedge 8 from moving when installed in the limiting slots 24, so that the slot wedge 8 can better limit the radial displacement or vibration of the stator winding 4, further ensuring the stability and reliability of the motor.

[0059] Furthermore, in combination with Figure 6 and Figure 7 as shown, the slot wall on the side of the first cooling oil duct 22 away from the stator slot 21 is a closed slot wall.

[0060] In this embodiment, the slot wall on the side of the first cooling oil duct 22 away from the stator slot 21 is not provided with an opening, that is, the slot wall on the radial inner side of the first cooling oil duct 22 is not provided with an opening. That is to say, the slot wall on the side of the first cooling oil duct 22 away from the stator slot 21 is a closed slot wall, making the winding slot a closed slot structure. At this time, the stator core 2 is usually used to install a flat wire winding. Compared with the case where the winding slot is an open slot structure, on the one hand, the sealing performance of the first cooling oil duct 22 can be improved, and on the other hand, the usage quantity of the slot wedge 8 can be saved, improving the assembly efficiency.

[0061] Furthermore, in combination with Figure 7 as shown, the width of the first cooling oil duct 22 is smaller than the width of the stator slot 21. Wherein, the width of the first cooling oil duct 22 is the dimension of the first cooling oil duct 22 in the circumferential direction of the stator core 2, and the width of the stator slot 21 is the dimension of the stator slot 21 in the circumferential direction of the stator core 2. Since too large a width of the first cooling oil duct 22 is likely to affect the magnetic field saturation, the width of the first cooling oil duct 22 is usually set to be smaller than the width of the stator slot 21 to cool the inner side of the stator winding 4 without affecting the magnetic field saturation.

[0062] Optionally, in combination with Figure 6 and Figure 7 as shown, the stator core 2 is further provided with a second cooling oil duct 23 penetrating along the axial direction. The second cooling oil duct 23 is located on the side of the stator slot 21 away from the central axis of the stator core 2, and the oil inlet end and the oil outlet end of the second cooling oil duct 23 are respectively communicated with the first cavity 5 and the second cavity 6.

[0063] Specifically, the second cooling oil channel 23 is arranged on the outside of the stator slot 21, and it can be a closed cavity structure independent of the stator slot 21, that is, the inner wall of the second cooling oil channel 23 is a closed annular structure, so that the second cooling oil channel 23 is not connected to the stator slot 21; the second cooling oil channel 23 can also be a semi-enclosed cavity structure connected to the stator slot 21, so that the second cooling oil channel 23 and the slot wedge 8 together form a closed cavity structure. At this time, it is necessary to set the slot wedge 8 at the connection between the second cooling oil channel 23 and the stator slot 21. In actual application, the design can be selected according to needs, and no specific limitation is made here.

[0064] In this optional embodiment, by arranging a second cooling oil channel 23 on the side of the stator slot 21 away from the central axis of the stator core 2, the cooling oil in the first cavity 5 can not only flow into the stator core 2 from the first cooling oil channel 22 to carry away the heat generated by the internal winding of the stator winding 4 and the stator core 2 on the radial inner side of the stator winding 4, but also flow into the stator core 2 from the second cooling oil channel 23 to further carry away the heat generated by the internal winding of the stator winding 4 and the stator core 2 on the radial outer side of the stator winding 4, thereby cooling the stator winding 4 on both the radial inner and radial outer sides of the stator winding 4, further improving the cooling effect of the stator winding 4.

[0065] Optionally, combined Figure 6 and Figure 7 As shown, the second cooling oil passages 23 and the stator slots 21 are arranged in one-to-one correspondence, and the second cooling oil passages 23 and the corresponding stator slots 21 are arranged at intervals in the radial direction of the stator core 2 .

[0066] In this embodiment, the number of the second cooling oil passages 23 and the number of the stator slots 21 are the same, and they are arranged in a one-to-one correspondence, that is, a second cooling oil passage 23 is provided on the radial outer side of each stator slot 21. In this way, the cooling area of ​​the internal winding of the stator winding 4 and the stator core 2 can be further increased, and the heat of the stator winding 4 in each stator slot 21 can be further ensured to be taken away by the cooling oil in the second cooling oil passage 23, thereby further improving the cooling effect of the stator winding 4.

[0067] Furthermore, combined with Figure 8 and Figure 9 As shown, the stator slot 21 is embedded with insulating paper 9 , and the insulating paper 9 forms a receiving slot for receiving the stator winding 4 .

[0068] In this embodiment, the shape of the insulating paper 9 is generally adapted to the shape of the stator slot 21. During assembly, the insulating paper 9 is usually first inserted into the stator slot 21, and then the stator winding 4 is installed in the accommodating slot surrounded by the insulating paper 9, so that the insulating paper 9 covers the inner winding of the stator winding 4. In this way, the setting of the insulating paper 9 can not only prevent the stator winding 4 from rubbing or scraping against the slot wall of the stator slot 21 or the edge of the open end of the stator slot 21 when the stator winding 4 is installed in a winding or insertion manner, so as to protect the stator winding 4, but also form an isolation layer between the stator winding 4 and the stator core 2, so as to improve the insulation strength of the stator winding 4, thereby reducing the discharge phenomenon and extending the service life of the motor.

[0069] A vehicle provided by the present utility model includes the motor assembly as described above.

[0070] The beneficial effects of the vehicle in this embodiment relative to the prior art are the same as those of the above-mentioned motor assembly, and will not be elaborated here.

[0071] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. A motor assembly, characterized in that: The invention comprises a housing (1), a stator core (2) arranged in the housing (1), a sealing assembly (3), and a stator winding (4); the sealing assembly (3) comprises a first sealing member (31) and a second sealing member (32); the first sealing member (31) and the second sealing member (32) are annular in structure and are respectively located at two ends of the stator core (2) along its axial direction; the first sealing member (31), the stator core (2) and the housing (1) form a first cavity (5); the second sealing member (32), the stator core (2) and the housing (1) form a second cavity (6); the housing (1) is provided with an oil inlet hole (113) and an oil outlet hole (114); the oil inlet hole (113) and the oil outlet hole (114) are respectively connected to the first cavity (5) and the second cavity (6); The stator core (2) is provided with a stator slot (21) and a first cooling oil passage (22) which are arranged to penetrate along the axial direction thereof; the stator winding (4) is installed at the stator slot (21), and the two ends of the stator winding (4) along the axial direction of the stator core (2) are respectively located in the first cavity (5) and the second cavity (6); the first cooling oil passage (22) is located on one side of the stator slot (21) close to the central axis of the stator core (2); the oil inlet ends of the stator slot (21) and the first cooling oil passage (22) are respectively connected to the first cavity (5), and the oil outlet ends of the stator slot (21) and the first cooling oil passage (22) are respectively connected to the second cavity (6).

2. The motor assembly according to claim 1, characterized in that: The housing (1) comprises an outer shell (11) provided with an opening (115) and an end cover (12) provided at the opening (115); the oil inlet hole (113) and the oil outlet hole (114) are both provided on the outer shell (11); the outer shell (11) comprises a bottom wall (112) provided opposite to the opening (115); the first sealing member (31) has two ends along its axial direction respectively abutting against a first end surface of the stator core (2) and the bottom wall (112); the second sealing member (32) has two ends along its axial direction respectively abutting against a second end surface of the stator core (2); The first cavity (5) is surrounded by the first end surface of the stator core (2), the bottom wall (112) and the first sealing member (31), and the second cavity (6) is surrounded by the second end surface of the stator core (2), the end cover (12) and the second sealing member (32); wherein the first end surface of the stator core (2) and the second end surface of the stator core (2) are respectively the end surfaces of the stator core (2) at both ends along its axial direction, and the first end surface of the stator core (2) is close to the bottom wall (112).

3. The motor assembly according to claim 2, characterized in that: The orthographic projection of the first sealing member (31) on the first end surface of the stator core (2) is located on a side of the first cooling oil passage (22) close to the central axis of the stator core (2), and / or the orthographic projection of the second sealing member (32) on the second end surface of the stator core (2) is located on a side of the first cooling oil passage (22) close to the central axis of the stator core (2).

4. The motor assembly according to claim 2, characterized in that: It also includes a first sealing structure (71), wherein one end of the first sealing member (31) close to the bottom wall (112) is sealedly connected to the bottom wall (112) through the first sealing structure (71); And / or, it also includes a second sealing structure (72), and one end of the second sealing member (32) close to the end cover (12) is sealedly connected to the end cover (12) through the second sealing structure (72).

5. The motor assembly according to claim 1, characterized in that: A plurality of the first cooling oil channels (22) are provided, and the plurality of the first cooling oil channels (22) are arranged at intervals along the circumference of the stator core (2), and the first cooling oil channels (22) are arranged in a one-to-one correspondence with the stator slots (21).

6. The motor assembly according to claim 5, characterized in that: The stator slot (21) and the corresponding first cooling oil channel (22) are connected in the radial direction of the stator core (2), and the connection between the stator slot (21) and the corresponding first cooling oil channel (22) is blocked by a slot wedge (8).

7. The motor assembly according to claim 1, characterized in that: The stator core (2) is further provided with a second cooling oil channel (23) which is arranged to penetrate the stator core (2) in the axial direction. The second cooling oil channel (23) is located on a side of the stator slot (21) which is away from the central axis of the stator core (2), and an oil inlet end and an oil outlet end of the second cooling oil channel (23) are respectively connected to the first cavity (5) and the second cavity (6).

8. The motor assembly according to claim 7, characterized in that: The second cooling oil passages (23) and the stator slots (21) are arranged in one-to-one correspondence, and the second cooling oil passages (23) and the corresponding stator slots (21) are arranged at intervals in the radial direction of the stator core (2).

9. The motor assembly according to claim 2, characterized in that: A first limiting protrusion (116) is provided on the side surface of the bottom wall (112) close to the stator core (2), and a second limiting protrusion (121) is provided on the side surface of the end cover (12) close to the stator core (2). The first limiting protrusion (116) and the second limiting protrusion (121) are annular in structure. The first sealing member (31) is located in a space surrounded by the first limiting protrusion (116), and the second sealing member (32) is located in a space surrounded by the second limiting protrusion (121). The spacing between the first limiting protrusion (116) and the second limiting protrusion (121) is greater than the axial dimension of the stator winding (4) on the stator core (2).

10. A vehicle, characterized in that: Comprising a motor assembly as described in any one of claims 1-9.

Images