Stator core, motor stator, drive motor and vehicle

Abstract

This disclosure relates to a stator core, a motor stator, a drive motor, and a vehicle. The stator core has oil inlet chambers, multiple oil inlet grooves, and multiple oil outlet grooves at both ends along the axial direction. The oil inlet chambers surround the stator core, and the oil inlet grooves and outlet grooves are alternately arranged circumferentially. The oil inlet grooves are connected to the oil inlet chambers. Multiple cooling channels are formed circumferentially inside the stator core. The oil inlet groove at one end is connected to the oil outlet groove at the other end through the cooling channels, forming a bidirectional cooling oil path in any two adjacent cooling channels. The end face of the stator core has oil spray holes connected to the oil outlet grooves. This technical solution helps to increase the effective flow rate of cooling oil flowing through the stator core per unit time, improving the cooling efficiency and heat dissipation uniformity of the stator core.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and in particular to a stator core, a motor stator, a drive motor, and a vehicle. Background Technology

[0002] In related technologies, the cooling oil circuit of motor stator often has limitations: the distribution of cooling oil supply area is not balanced enough, making it difficult to achieve uniform oil supply to all areas of stator core; the effective flow rate of cooling oil inside stator core is insufficient, making it difficult to meet the requirements of efficient heat dissipation. Utility Model Content

[0003] To overcome the problems existing in related technologies, this disclosure provides a stator core, a motor stator, a drive motor, and a vehicle.

[0004] According to a first aspect of the present disclosure, a stator core is provided, wherein each end of the stator core along the axial direction is provided with an oil inlet cavity, a plurality of oil inlet grooves and a plurality of oil outlet grooves, the oil inlet cavity surrounds the circumference of the stator core, the oil inlet grooves and the oil outlet grooves are alternately arranged in the circumferential direction, the oil inlet grooves are connected to the oil inlet cavity, and a plurality of cooling channels are formed in the interior of the stator core along the circumferential direction, wherein the oil inlet groove at one end is connected to the oil outlet groove at the other end through the cooling channels to form a bidirectional cooling oil path in any two adjacent cooling channels, and the end face of the stator core is provided with an oil spray hole connected to the oil outlet groove.

[0005] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The stator core provided by this disclosure provides a balanced circumferential oil supply basis for cooling oil by setting oil inlet chambers around both ends of the axial direction. At the same time, with the circumferentially alternating oil inlet and outlet grooves and internal cooling channels, the structure of simultaneous oil inlet and outlet at both ends of the stator core and bidirectional alternating oil outlet is realized. That is, the cooling oil enters the cooling oil channel from both ends of the stator core at the same time, and the flow direction of the cooling oil in any two adjacent cooling oil channels is opposite. This makes it possible for cooling oil to flow through the entire cross section, which is beneficial to increase the effective flow rate of cooling oil flowing through the interior of the stator core per unit time, and improve the cooling efficiency and heat dissipation uniformity of the stator core.

[0006] In some possible implementations, the stator core includes a main lamination assembly and end lamination assemblies stacked at both ends of the main lamination assembly along the axial direction. The cooling channels are circumferentially spaced within the main lamination assembly, and the oil inlet chamber, oil inlet groove, and oil outlet groove are formed on the outer peripheral wall of the end lamination assemblies. This functional partitioning design, combined with a modular stacking structure, improves the ease of maintenance and the stability of cooling performance of the stator core.

[0007] In some possible implementations, the main body lamination assembly includes a plurality of first laminations stacked axially, the first laminations having a plurality of oil holes spaced apart circumferentially, the plurality of oil holes being connected axially to form the cooling channel; The oil inlet groove at one end is axially aligned with the oil outlet groove at the other end, and the oil hole of the subsequent first lamination is aligned with the oil hole of the preceding first lamination. This structure ensures that the cooling channel extends smoothly in a straight line along the axial direction, reducing the frictional resistance of the cooling oil within the cooling channel and ensuring a stable cooling oil flow rate. At the same time, the aligned oil hole design reduces the alignment difficulty when stacking laminations, facilitates standardized processing and assembly, reduces the risk of oil passage blockage due to misalignment, and ensures stable and reliable heat dissipation efficiency.

[0008] Alternatively, the oil inlet groove at one end is offset circumferentially relative to the oil outlet groove at the other end, and the oil hole of the subsequent first lamination is offset circumferentially relative to the oil hole of the preceding first lamination and is connected. This structure allows the cooling oil to travel in a tortuous manner in the circumferential direction, extending the flow path of the cooling oil inside the stator core. This helps to increase the contact area between the cooling oil and the stator core and prolong the flow time of the cooling oil, further enhancing the heat dissipation effect and making it suitable for the high-efficiency cooling requirements of high-power motors.

[0009] In some possible implementations, the end-piece lamination assembly includes a second lamination, a third lamination, a fourth lamination, and a fifth lamination stacked sequentially outward along the axial direction. The oil inlet groove and the oil outlet groove are formed between the second and third laminations, and the oil inlet cavity is formed between the third, fourth, and fifth laminations. This stacked structure breaks down the complex oil inlet and outlet structure into the mating relationships between different laminations. Each lamination only needs to be machined with a simple local structure to achieve the oil passage function, eliminating the need to integrate complex oil passages on a single lamination, thus significantly simplifying the machining difficulty of a single lamination. In some possible implementations, the outer peripheral wall of the second stamping is provided with a plurality of radially outwardly protruding ribs spaced apart circumferentially, the ribs extending axially. The outer peripheral wall of the third stamping is provided with a plurality of radially outwardly protruding baffles spaced apart circumferentially. The baffles, two opposing ribs, and the end face of the first stamping form the oil outlet groove, which communicates with the oil hole. The third stamping is provided with a first oil outlet hole, which communicates with the oil injection hole. The oil outlet groove can be formed by the structural cooperation of each stamping, eliminating the need for complex processing of individual stampings, reducing the manufacturing difficulty of individual stampings, and facilitating the mass standardized production of stampings. At the same time, the stable structure of the standardized stampings ensures the consistency of the size and position of the oil outlet groove.

[0010] In some possible implementations, the radial distance from the oil injection hole to the axis of the stator core is less than the radial distance from the oil hole to the axis of the stator core. The fourth stamping is provided with a plurality of second oil outlet holes spaced apart along the circumference. Both the first oil outlet hole and the second oil outlet hole are constructed as radially extending strip-shaped holes, and the length of the second oil outlet hole is greater than the length of the first oil outlet hole. The upper part of the second oil outlet hole is connected to the first oil outlet hole, and the lower part of the second oil outlet hole is connected to the oil injection hole.

[0011] The stator core uses a design where the radial distance from the oil injection hole to the axis is less than the radial distance from the oil hole to the axis, allowing the oil injection hole to be positioned closer in height to components such as the copper wire to be sprayed. Simultaneously, the second oil outlet hole, spaced circumferentially apart on the fourth lamination, and the first oil outlet hole on the third lamination are both constructed as radially extending strip-shaped holes, with the second oil outlet hole being longer than the first. This combination of hole lengths, along with a simple lamination opening design, guides the cooling oil smoothly from the oil hole at a higher radial position to the oil injection hole at a lower radial position, providing stable flow channel support for the radial descent of the cooling oil and ensuring smooth flow of the cooling oil path.

[0012] In some possible implementations, the shaft diameter of the fourth lamination is smaller than that of the third and fifth laminations, wherein the end face of the third lamination, the outer peripheral wall of the fourth lamination, and the end face of the fifth lamination form the oil inlet cavity. This design, which constructs the oil inlet cavity through the difference in shaft diameter of different laminations, eliminates the need for additional machining of complex recessed structures on the laminations. Stable forming of the oil inlet cavity can be achieved simply by standardizing the size matching of the laminations, simplifying the lamination machining process. At the same time, the oil inlet formed by this structure can provide sufficient buffer space for the cooling oil, ensuring that the cooling oil is evenly distributed to each oil passage.

[0013] In some possible implementations, two circumferentially adjacent oil outlet grooves, one of which has a raised rib, the other of which has a raised rib, and the end face of the first stamping form the oil inlet groove. The oil inlet groove communicates with the oil hole, and the other side of the oil inlet groove opposite to the first stamping is an opening communicating with the oil inlet cavity. This allows the oil inlet groove to be formed through the coordinated cooperation of the existing features of the stamping, simplifying the overall structural design and processing flow. Simultaneously, the oil inlet groove communicating with the oil hole and the other side being an opening communicating with the oil inlet cavity allows the cooling oil in the oil inlet cavity to enter the oil inlet groove through the opening and be guided to the oil hole, ensuring efficient delivery of cooling oil from the oil inlet cavity to the cooling channel, further improving cooling efficiency and heat dissipation uniformity.

[0014] According to a second aspect of the present disclosure, a motor stator is provided, including a housing and a stator core disposed within the housing, the stator core including any of the above-mentioned stator cores, wherein the housing is provided with oil inlet holes at both ends along the axial direction, and the positions of the oil inlet holes correspond to the oil inlet chambers.

[0015] According to a third aspect of the present disclosure, a drive motor is provided, comprising a motor stator including any one of the above.

[0016] According to a fourth aspect of the present disclosure, a vehicle is provided, including a drive motor of any one of the above.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0019] Figure 1 This is a perspective view of a stator core according to an exemplary embodiment.

[0020] Figure 2 yes Figure 1 Front view of the middle stator core.

[0021] Figure 3 This is a schematic diagram of the structure of a first lamination according to an exemplary embodiment.

[0022] Figure 4 This is a schematic diagram of the structure of a second lamination according to an exemplary embodiment.

[0023] Figure 5 This is a schematic diagram of the structure of a third lamination according to an exemplary embodiment.

[0024] Figure 6 This is a schematic diagram of the structure of a fourth lamination according to an exemplary embodiment.

[0025] Figure 7 This is a schematic diagram of the structure of a fifth lamination according to an exemplary embodiment.

[0026] Figure 8 This is a perspective view of an electric motor stator according to an exemplary embodiment.

[0027] Explanation of reference numerals in the attached figures 100-Stator core, 110-Oil inlet cavity, 120-Oil inlet groove, 130-Oil outlet groove, 10-Main body lamination group, 1-First lamination, 11-Oil hole, 20-End lamination group, 2-Second lamination group, 21-Rib, 3-Third lamination group, 31-Baffle, 32-First oil outlet hole, 4-Fourth lamination group, 41-Second oil outlet hole, 5-Fifth lamination group, 51-Oil spray hole, 200-Housing shell, 210-Oil inlet hole. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0029] like Figures 1 to 7 As shown, an exemplary embodiment of this disclosure provides a stator core 100. The stator core 100 has an oil inlet chamber 110, a plurality of oil inlet grooves 120 and a plurality of oil outlet grooves 130 at both ends along the axial direction. The oil inlet chamber 110 surrounds the stator core 100. The oil inlet grooves 120 and oil outlet grooves 130 are alternately arranged in the circumferential direction. The oil inlet grooves 120 are connected to the oil inlet chamber 110. Multiple cooling channels are formed in the interior of the stator core 100 in the circumferential direction. The oil inlet groove 120 at one end is connected to the oil outlet groove 130 at the other end through the cooling channels to form a bidirectional cooling oil path in any two adjacent cooling channels. The end face of the stator core 100 is provided with an oil spray hole 51 that is connected to the oil outlet groove 130.

[0030] The stator housing 200 of the motor has an oil inlet hole 210 corresponding to the position of the oil inlet chamber 110, allowing cooling oil to enter the oil inlet chamber 110. The oil inlet chamber 110 surrounds the stator core 100, providing a balanced circumferential oil supply for the cooling oil. That is, after the cooling oil enters the oil inlet chamber 110 through the oil inlet hole 210, it flows circumferentially and simultaneously enters the oil inlet groove 120. The oil inlet groove 120 and the oil outlet groove 130 are alternately arranged circumferentially, that is, arranged sequentially in the circumferential direction as oil inlet groove 120, oil outlet groove 130, oil inlet groove 120... The stator core 100 has multiple cooling channels formed circumferentially inside. Among them, the oil inlet groove 120 at one end and the oil outlet groove 130 at the other end are connected through the cooling channels to form a bidirectional cooling oil path in any two adjacent cooling channels. Figure 1 As shown, the solid line indicates the flow of cooling oil from the first end to the second end of the stator core 100, and the dashed line adjacent to the cooling oil channel indicates the flow of cooling oil from the second end to the first end of the stator core 100.

[0031] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The stator core 100 provided by this disclosure provides a balanced circumferential oil supply basis for cooling oil by setting an oil inlet cavity 110 around both ends of the axial direction. At the same time, in conjunction with the circumferentially alternating oil inlet groove 120 and oil outlet groove 130 and internal cooling flow channel, the structure of simultaneous oil inlet at both ends of the stator core 100 and bidirectional alternating oil outlet is realized. That is, the cooling oil enters the cooling oil channel from both ends of the stator core 100 at the same time, and the flow direction of the cooling oil in any two adjacent cooling oil channels is opposite. This makes it possible for cooling oil to flow through the entire cross section, which is beneficial to increase the effective flow rate of cooling oil flowing through the interior of the stator core per unit time, and improve the cooling efficiency and heat dissipation uniformity of the stator core.

[0032] In some possible implementations, such as Figure 2 As shown, the stator core 100 includes a main lamination assembly 10 and end lamination assemblies 20 stacked at both ends of the main lamination assembly 10 along the axial direction. Cooling channels are spaced circumferentially on the main lamination assembly 10, and oil inlet chambers 110, oil inlet grooves 120, and oil outlet grooves 130 are formed on the outer peripheral wall of the end lamination assemblies 20. The stator core 100 adopts a non-integrated structure with the main lamination assembly 10 and end lamination assemblies 20 stacked together, which helps reduce processing difficulty and facilitates maintenance. Simultaneously, by placing the cooling channels on the main lamination assembly 10 and forming the oil inlet grooves 120 and 130 on the outer peripheral wall of the end lamination assemblies 20, a functional zoning design for the cooling channels and oil inlet / outlet structures can be achieved. The main lamination assembly 10 ensures uniform arrangement of the cooling channels and heat dissipation efficiency, while the end lamination assemblies 20 connect the cooling oil circuit to the outside. This functional zoning design, combined with the modular stacking structure, improves the ease of maintenance and the stability of the cooling performance of the stator core 100.

[0033] You can refer to this at the same time. Figure 2 and Figure 3 The main lamination assembly 10 may include a plurality of first laminations 1 stacked axially. Each first lamination 1 has a plurality of oil holes 11 spaced circumferentially, and these oil holes 11 are interconnected axially to form the cooling channel. In some possible embodiments, the oil inlet groove 120 at one end is axially aligned with the oil outlet groove 130 at the other end, and the oil holes 51 of the subsequent first lamination 1 are aligned with the oil holes 51 of the preceding first lamination 1. This structure ensures that the cooling channel extends smoothly in a straight line along the axial direction, reducing the frictional resistance of the cooling oil within the channel and ensuring a stable cooling oil flow rate. Simultaneously, the aligned oil holes 11 design reduces the alignment difficulty during lamination stacking, facilitating standardized processing and assembly, reducing the risk of oil passage blockage due to misalignment, and ensuring stable and reliable heat dissipation efficiency.

[0034] In other possible implementations, such as Figure 1As shown, the oil inlet groove 120 at one end is offset relative to the oil outlet groove 130 at the other end in the circumferential direction, and the oil hole 51 of the subsequent first lamination 1 is offset relative to the oil hole 51 of the preceding first lamination 1 in the circumferential direction and is connected. This offset and connection can be understood as the projections of the subsequent oil hole 51 and the preceding oil hole 51 partially overlapping in the axial direction. This structure allows the cooling oil to travel in a tortuous manner in the circumferential direction, extending the flow path of the cooling oil inside the stator core 100. This helps to increase the contact area between the cooling oil and the stator core 100 and prolong the flow time of the cooling oil, further enhancing the heat dissipation effect and making it suitable for the high-efficiency cooling requirements of high-power motors.

[0035] The end lamination assembly 20 may further include multiple laminations. For example... Figure 2 As shown, the end lamination group 20 includes a second lamination 2, a third lamination 3, a fourth lamination 4, and a fifth lamination 5 stacked sequentially outward along the axial direction. An oil inlet groove 120 and an oil outlet groove 130 are formed between the second lamination 2 and the third lamination 3, and an oil inlet cavity 110 is formed between the third lamination 3, the fourth lamination 4, and the fifth lamination 5. This stacked structure breaks down the complex oil inlet and outlet structure into the mating relationships between different laminations. Each lamination only needs to be machined with a simple local structure to achieve the oil circuit function, eliminating the need to integrate complex oil circuits on a single lamination, thus simplifying the machining difficulty of a single lamination. Furthermore, when a lamination is damaged or needs adjustment, the corresponding lamination can be replaced or repaired individually without overall disassembly, improving maintenance convenience.

[0036] In some possible implementations, in conjunction with the reference Figure 1 , Figure 4 and Figure 5 The outer peripheral wall of the second stamp 2 is provided with multiple radially outward protruding ribs 21 spaced apart circumferentially. The ribs 21 extend axially. The outer peripheral wall of the third stamp 3 is provided with multiple radially outward protruding baffles 31 spaced apart circumferentially. The baffles 31, the two opposing ribs 21, and the end face of the first stamp 1 form an oil outlet groove 130, which communicates with the oil hole 11. The third stamp 3 is provided with a first oil outlet hole 32, which communicates with the oil spray hole 51. The oil outlet groove can be formed by the cooperation of the structures on each stamp, without the need for complex processing of a single stamp, reducing the manufacturing difficulty of a single stamp and making it easier to achieve mass standardized production of stamps. At the same time, the stable structure of the standardized stamps can ensure the consistency of the size and position of the oil outlet groove 130. In conjunction with the first oil outlet 32 ​​on the third punch 3 that is connected to the oil injection hole 51, the cooling oil in the oil outlet groove 130 enters through the oil hole 11 and can be smoothly guided to the oil injection hole 51 through the first oil outlet 32 ​​to ensure the continuity of the cooling oil circuit.

[0037] In other possible implementations, in conjunction with the reference Figure 1 , Figures 5 to 7The radial distance from the oil injection hole 51 to the axis of the stator core 100 is less than the radial distance from the oil hole 11 to the axis of the stator core 100. The fourth lamination 4 is provided with multiple second oil outlet holes 41 spaced apart circumferentially. Both the first oil outlet hole 32 and the second oil outlet hole 41 are constructed as radially extending strip-shaped holes, and the length of the second oil outlet hole 41 is greater than the length of the first oil outlet hole 32. The upper part of the second oil outlet hole 41 communicates with the first oil outlet hole 32, and the lower part of the second oil outlet hole 41 communicates with the oil injection hole 51.

[0038] The stator core 100 uses a design where the radial distance from the oil spray hole 51 to the axis is less than the radial distance from the oil hole 11 to the axis, allowing the oil spray hole 51 to be positioned closer in height to components such as copper wires to be sprayed. This positioning design ensures that the cooling oil reaches the area requiring cooling directly without the need for additional adjustment of the spray angle, improving the targeted nature of the spray cooling. Simultaneously, the second oil outlet hole 41, spaced circumferentially at intervals on the fourth lamination 4, and the first oil outlet hole 32, on the third lamination 3, are both constructed as radially extending strip-shaped holes. The second oil outlet hole 41 is longer than the first oil outlet hole. This combination of different hole lengths, along with the simple lamination opening design, guides the cooling oil smoothly from the oil hole 11 at a higher radial position to the oil spray hole 51 at a lower radial position, providing stable flow channel support for the radial height descent of the cooling oil and ensuring smooth flow of the cooling oil path.

[0039] Regarding the formation of the oil inlet chamber 110, in some possible embodiments, refer to the reference Figure 1 , Figures 5 to 7 The shaft diameter of the fourth lamination 4 is smaller than that of the third lamination 3 and the fifth lamination 5. The end face of the third lamination 3, the outer peripheral wall of the fourth lamination 4, and the end face of the fifth lamination 5 form the oil inlet cavity 110. This design, which constructs the oil inlet cavity 110 through the difference in shaft diameter of different laminations, eliminates the need for additional complex recessed structures on the laminations. Stable forming of the oil inlet cavity 110 can be achieved simply by matching the dimensions of standardized laminations, simplifying the lamination processing technology. Simultaneously, the oil inlet 110 formed by this structure provides sufficient buffer space for the cooling oil, ensuring uniform distribution of the cooling oil to each oil passage. Figure 1As shown, two adjacent oil outlet grooves 130 in the circumferential direction form an oil inlet groove 120 with one rib 21 of one groove, one rib 21 of the other groove, and the end face of the first stamping 1. The oil inlet groove 120 is connected to the oil hole 11, and the other side of the oil inlet groove 120 opposite to the first stamping 1 is an opening connected to the oil inlet cavity 110. This allows the oil inlet groove 120 to be formed through the coordinated cooperation of the existing features of the stamping, simplifying the overall structural design and processing flow. Simultaneously, the oil inlet groove 120's connection to the oil hole 11 and its open connection to the oil inlet cavity 110 allow the cooling oil in the oil inlet cavity 110 to enter the oil inlet groove 120 through the open and be guided to the oil hole 11, ensuring efficient delivery of cooling oil from the oil inlet cavity 110 to the cooling channel, further improving cooling efficiency and heat dissipation uniformity.

[0040] According to a second aspect of the present disclosure, a motor stator is also provided, including a housing 200 and a stator core 100 of any of the above, wherein the housing 200 is provided with oil inlet holes 210 at both ends along the axial direction, and the positions of the oil inlet holes 210 correspond to the oil inlet chamber 110.

[0041] The motor stator has oil inlet holes 210 at both ends of the housing 200, corresponding to the positions of the oil inlet chambers 110 of the stator core 100. This allows external cooling oil to be delivered to the oil inlet chambers 110 of the stator core 100 through the two-way oil inlet holes 210, providing a stable and sufficient oil supply for the bidirectional cooling oil circuit of the stator core 100. Furthermore, this corresponding arrangement of the housing 200 and the oil circuit structure of the stator core 100 ensures efficient connection of cooling oil from external input to internal oil circuits, avoiding deviation or loss of the oil supply path. This allows the cooling oil to enter the oil inlet groove 120 quickly and evenly and be guided to each cooling channel, ensuring efficient heat dissipation of the stator core 100.

[0042] According to a third aspect of the present disclosure, a drive motor is also provided, which includes the motor stator of any of the above-mentioned embodiments and has all of its beneficial effects, which will not be repeated here.

[0043] According to a fourth aspect of the present disclosure, a vehicle is also provided, including a drive motor of any of the above.

[0044] In the above detailed description, reference has been made to the accompanying drawings, which illustrate specific aspects of this disclosure by way of illustration. In this regard, terms indicating direction or positional relationship, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential,” are used with reference to the orientation of the described figures. Since components of the described device can be positioned in multiple different orientations, directional terms are used for illustrative purposes and not for limitation. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0045] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term “and / or” includes any one of the relevant listed items and any combination of any two or more; similarly, “at least one of…” includes any one of the relevant listed items and any combination of any two or more.

[0046] It should be understood that, unless otherwise expressly specified and limited, the terms "joining," "attaching," "installing," "connecting," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein based on the specific circumstances.

[0047] Furthermore, the term "above" as used herein with respect to components, elements, or material layers formed or located "above" a surface may be used to indicate that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or material layer. However, the term "above" as used with respect to components, elements, or material layers formed or located "above" a surface may also optionally have a specific meaning: that the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, for example, in direct contact with the surface.

[0048] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

Claims

1. A stator core characterized by, The stator core has an oil inlet chamber, multiple oil inlet grooves, and multiple oil outlet grooves at both ends along the axial direction. The oil inlet chambers surround the stator core. The oil inlet grooves and oil outlet grooves are alternately arranged in the circumferential direction. The oil inlet grooves are connected to the oil inlet chambers. Multiple cooling channels are formed in the circumferential direction inside the stator core. The oil inlet groove at one end is connected to the oil outlet groove at the other end through the cooling channels to form a bidirectional cooling oil path in any two adjacent cooling channels. The end face of the stator core is provided with an oil spray hole that is connected to the oil outlet groove.

2. The stator core according to claim 1, characterized by The stator core includes a main lamination group and end lamination groups stacked at both ends of the main lamination group along the axial direction. The cooling channels are circumferentially spaced in the main lamination group, and the oil inlet chamber, the oil inlet groove and the oil outlet groove are formed on the outer peripheral wall of the end lamination group.

3. The stator core of claim 2, characterized by The main lamination assembly includes a plurality of first laminations stacked along the axial direction. The first laminations are provided with a plurality of oil holes spaced apart in the circumferential direction. The plurality of oil holes are connected in the axial direction to form the cooling channel. The oil inlet groove at one end is axially aligned with the oil outlet groove at the other end, and the oil hole of the subsequent first punch is aligned with the oil hole of the preceding first punch. or The oil inlet groove at one end is offset in the circumferential direction relative to the oil outlet groove at the other end, and the oil hole of the subsequent first punch is offset in the circumferential direction relative to the oil hole of the previous first punch and is connected.

4. The stator core of claim 3, characterized by The end-piece assembly includes a second, third, fourth, and fifth piece stacked outward along the axial direction, wherein the oil inlet groove and the oil outlet groove are formed between the second and third pieces, and the oil inlet cavity is formed between the third, fourth, and fifth pieces.

5. The stator core of claim 4, characterized by The outer peripheral wall of the second punch is provided with a plurality of radially outward protruding ribs at intervals along the circumference. The ribs extend axially. The outer peripheral wall of the third punch is provided with a plurality of radially outward protruding baffles at intervals along the circumference. The baffles, the two opposing ribs, and the end face of the first punch form the oil outlet groove. The oil outlet groove communicates with the oil hole. The third punch is provided with a first oil outlet hole, which communicates with the oil injection hole.

6. The stator core of claim 5, characterized by The radial distance from the oil injection hole to the axis of the stator core is less than the radial distance from the oil hole to the axis of the stator core. The fourth stamping is provided with a plurality of second oil outlet holes spaced apart along the circumference. Both the first oil outlet hole and the second oil outlet hole are constructed as radially extending strip-shaped holes, and the length of the second oil outlet hole is greater than the length of the first oil outlet hole. The upper part of the second oil outlet hole is connected to the first oil outlet hole, and the lower part of the second oil outlet hole is connected to the oil injection hole.

7. The stator core of claim 5, characterized by The shaft diameter of the fourth lamination is smaller than that of the third lamination and the fifth lamination, wherein the end face of the third lamination, the outer peripheral wall of the fourth lamination, and the end face of the fifth lamination form the oil inlet cavity.

8. The stator core of claim 7, characterized by Two adjacent oil outlet grooves in the circumferential direction, one of the ribs of one of them, one of the ribs of the other and the end face of the first punch form the oil inlet groove, the oil inlet groove is connected to the oil hole, and the other side of the oil inlet groove opposite to the first punch is an opening connected to the oil inlet cavity.

9. An electric machine stator, characterized by The device includes a housing and a stator core disposed within the housing. The stator core includes the stator core as described in any one of claims 1-8. The housing has oil inlet holes at both ends along the axial direction, and the positions of the oil inlet holes correspond to the oil inlet chamber.

10. A drive motor characterized by Includes the motor stator as described in claim 9.

11. A vehicle characterized by comprising: Includes the drive motor as described in claim 10.

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