Oil path structure, motor and vehicle

Abstract

This application relates to an oil circuit structure, a motor, and a vehicle. The oil circuit structure includes: a plurality of first branches located on the outer peripheral surface of a stator core, each first branch extending along the axial direction of the stator core; a plurality of second branches located inside the stator core, each second branch extending inward along the radial direction of the stator core, and each second branch connecting to a first branch; and a plurality of third branches located inside the stator core, each third branch extending along the axial direction of the stator core, and each third branch connecting to a second branch. This application forms a complete cooling oil circuit embedded inside the core, eliminating the need for an oil injection ring to guide and distribute cooling oil, thus eliminating the need for an oil injection ring and its accessories. This results in a more compact overall design, facilitating miniaturization, reducing the number of parts, and lowering assembly complexity.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to hydraulic circuit structures, motors, and vehicles. Background Technology

[0002] Currently, generator stator core cooling is typically achieved using an independent oil injection ring structure. The oil injection ring is located near the housing surface and guides the cooling oil into the cooling channels of the stator core. However, the oil injection ring and its related sealing and fixing structures occupy the limited space around the housing surface, preventing further reduction in the size of the housing surface and resulting in a relatively large overall space layout, which is not conducive to the miniaturization and compact design of generators. Summary of the Invention

[0003] Based on this, an oil circuit structure, motor, and vehicle are provided to form a complete cooling oil circuit embedded inside the iron core. Cooling oil can be guided and distributed without the need for an oil injection ring, eliminating the need for an oil injection ring and its accessories. The whole machine is more compact, which is conducive to miniaturization, while reducing the number of parts and reducing assembly complexity.

[0004] In a first aspect, an oil circuit structure is provided, the oil circuit structure comprising: a plurality of first branches located on the outer peripheral surface of a stator core, each first branch extending along the axial direction of the stator core; a plurality of second branches located inside the stator core, each second branch extending inward along the radial direction of the stator core, the second branches connecting to the first branches; and a plurality of third branches located inside the stator core, each third branch extending along the axial direction of the stator core, each third branch connecting to the second branches.

[0005] In one embodiment, the first branch includes a first sealing path, an extension path, and a second sealing path distributed along the axial direction of the stator core; wherein the first sealing path and the second sealing path each include a plurality of elongated segments and a plurality of conductive segments distributed at intervals along the axial direction, the plurality of conductive segments respectively connecting two adjacent elongated segments; for the same elongated segment, two conductive segments located on both sides of its axial direction are respectively disposed at two opposite ends of the elongated segment along the circumferential direction, and the conductive segment located between two adjacent elongated segments connects the same end of the two adjacent elongated segments along the circumferential direction.

[0006] In one embodiment, the first sealing path is formed by stacking multiple first laminations. The outer edge of each first lamination is provided with multiple first grooves and multiple oil passage holes. The multiple first grooves and multiple oil passage holes are alternately distributed along the circumferential direction. The multiple first laminations are rotated sequentially by a preset angle along the circumferential direction. The preset angle is the interval angle between adjacent first grooves and oil passage holes. The first grooves constitute the elongated segment, and the oil passage holes constitute the conductive segment.

[0007] In one embodiment, the plurality of first stamps corresponding to the first sealing path rotate sequentially by a preset angle along a first rotation direction in the circumferential direction, and the plurality of first stamps corresponding to the second sealing path rotate sequentially by a preset angle along a second rotation direction in the circumferential direction, wherein the second rotation direction and the first rotation direction are opposite.

[0008] In one embodiment, the multiple extension paths are divided into a first extension path and a second extension path that are alternately distributed along the circumferential direction. The first extension path includes a multiple first extension segment, a second extension segment, a third extension segment and a fourth extension segment that are alternately distributed along the axial direction. The second extension path includes a multiple third extension segment, a fourth extension segment, a first extension segment and a second extension segment that are alternately distributed along the axial direction.

[0009] In one embodiment, the extension path is formed by stacking the first lamination and the second lamination; the outer edge of the second lamination is provided with a plurality of second grooves and a plurality of oil inlet holes, and the second grooves and the oil inlet holes are alternately distributed in the circumferential direction; the first extension section is formed by stacking the oil inlet holes, the second extension section is formed by a part of the oil inlet holes, the third extension section is formed by stacking the first grooves, and the fourth extension section is formed by the second grooves.

[0010] In one embodiment, the oil inlet extends along the radial direction of the stator core, and the second branch is formed as a portion of the oil inlet.

[0011] In one embodiment, the first lamination is provided with a plurality of first oil passage holes distributed sequentially along a spiral path; the third branch includes a first distribution path, an oil injection path and a second distribution path distributed along the axial direction of the stator core; wherein the first distribution path and the second distribution path are both formed by stacking the first oil passage holes of the first lamination.

[0012] In one embodiment, the plurality of fuel injection paths in the circumferential direction are divided into a first fuel injection path and a second fuel injection path that are alternately distributed in sequence. The first fuel injection path includes a plurality of first fuel injection segments, second fuel injection segments, third fuel injection segments and fourth fuel injection segments that are alternately distributed in the axial direction. The second fuel injection path includes a plurality of third fuel injection segments, fourth fuel injection segments, first fuel injection segments and second fuel injection segments that are alternately distributed in the axial direction. The first fuel injection segment is formed by stacking the first fuel passage holes. The second fuel injection segment is formed by a portion of the fuel inlet hole. The third fuel injection segment is formed by stacking the first fuel passage holes. The fourth fuel injection segment is formed by a portion of the fuel inlet hole.

[0013] In one embodiment, the oil circuit structure further includes an oil inlet circuit located on the inner circumferential surface and inside of the housing, the oil inlet circuit corresponding to the axial middle of the stator core, and including: a first branch circuit located inside the housing and extending along the axial direction of the stator core, the top end of the first branch circuit communicating with the end face of the housing; a second branch circuit located inside the housing and extending inward along the radial direction of the stator core, the second branch circuit located at the middle of the axial direction of the housing, the outer end of the second branch circuit communicating with the first branch circuit; a connecting groove located on the inner circumferential surface of the housing, the connecting groove extending along the axial direction and communicating with the inner end of the second branch circuit; and a plurality of annular guide grooves, each of the annular guide grooves communicating with the connecting groove, each of the annular guide grooves being distributed along the axial direction, and each of the first branches communicating with the plurality of annular guide grooves.

[0014] In a second aspect, an electric motor is provided, including the oil circuit structure as described in the first aspect.

[0015] Thirdly, a vehicle is provided, including an electric motor as described in the second aspect.

[0016] This application integrates an oil circuit structure within the stator core, utilizing a first branch extending axially on the outer circumference, a second branch extending radially inward, and a third branch extending axially internally, sequentially connected to form a complete cooling oil circuit embedded within the core. Multiple branches form multiple cooling channels, increasing the total flow area, reducing flow resistance, and thus improving cooling efficiency. Consequently, the cooling oil can be guided and distributed without the need for an additional oil injection ring, saving space for the oil injection ring and its associated components. This results in a more compact overall structure, facilitating miniaturization design, while also reducing the number of parts and assembly complexity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the stator core provided in one embodiment of this application.

[0018] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0019] Figure 3 This is a schematic diagram of the bent snap-fit ​​part.

[0020] Figure 4 This is a magnified view of a portion of the first lamination.

[0021] Figure 5 This is a magnified view of a portion of the second lamination.

[0022] Figure 6 This is a schematic diagram of the oil circuit structure provided in one embodiment of this application.

[0023] Figure 7 Schematic diagram of the first branch road Figure 1 .

[0024] Figure 8 Schematic diagram of the first branch road Figure 2 .

[0025] Figure 9 This is a schematic diagram of the connection of the second branch.

[0026] Figure 10 This is a schematic diagram of the third branch road.

[0027] Figure 11 This is a partial schematic diagram of the casing.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Ontology;

[0030] 110. First lamination; 111. First groove; 112. Oil passage hole; 113. First oil channel hole;

[0031] 120. Second lamination; 121. Second groove; 122. Oil inlet hole; 123. Second oil passage hole;

[0032] 130. First component;

[0033] 140. Second component; 141. Receiving slot;

[0034] 150. The fourth component;

[0035] 160. The third component;

[0036] 200. Connecting part;

[0037] 300. First branch road;

[0038] 310. First sealed section; 311. Long strip section; 312. Conducting section;

[0039] 320. Second sealed path;

[0040] 330A, First Extension Road; 330B, Second Extension Road; 331, First Extension Section; 332, Second Extension Section; 333, Third Extension Section; 334, Fourth Extension Section;

[0041] 400, Second Branch Road;

[0042] 500, Third Branch Circuit; 510, First Distribution Circuit; 520, Second Distribution Circuit; 530A, First Injection Circuit; 530B, Second Injection Circuit; 531, First Injection Section; 532, Second Injection Section; 533, Third Injection Section; 534, Fourth Injection Section;

[0043] 700, Oil inlet; 710, First branch; 720, Second branch; 730, Connecting channel; 740, Annular guide channel;

[0044] 800. Housing. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] Figure 1 This is a schematic diagram of the stator core provided in one embodiment of this application. Figure 2 for Figure 1 A magnified view of a portion of point A in the middle. Figure 3 This is a schematic diagram of the bent snap-fit ​​part. Figure 4 This is a magnified view of a portion of the first lamination. Figure 5 This is a magnified view of a portion of the second lamination.

[0047] The following is combined Figures 1 to 5 The stator core according to the implementation scheme of this application is described.

[0048] The stator core of this application is installed to the housing 800, such as Figures 1 to 3 As shown, the stator core of this application includes: a body 100 and a plurality of snap-fit ​​parts 200.

[0049] like Figure 2As shown, multiple snap-fit ​​portions 200 are provided on the outer peripheral surface of the body 100 and protrude from the outer peripheral surface of the body 100 along the radial direction. When the body 100 is not installed in the housing 800, the snap-fit ​​portions 200 generally extend radially, and their extension direction is perpendicular or nearly perpendicular to the axis of the body 100.

[0050] The snap-fit ​​portion 200 has a deformable capability, allowing it to bend in a second direction based on resistance from the housing 800 when the main body 100 is inserted into the housing 800 along a first direction (see fitting details). Figure 3 The locking portion 200 forms a barbed structure to restrict the body 100 from detaching from the housing 800 along the second direction. The first and second directions are two opposite directions along the axis of the body 100. The first direction is typically the pressing direction, i.e., the direction in which the body 100 moves from the open end of the housing 800 towards the bottom. The second direction is the pulling direction, i.e., the direction in which the body 100 is withdrawn from the inside of the housing 800. After being inserted into the housing 800, once the body 100 tends to move in the second direction, the locking portion 200 hooks onto the inner wall of the housing 800 like a barb, creating a self-locking effect. This self-locking effect is enhanced as the tendency of the body 100 to move in the second direction increases, because the end of the locking portion 200 further embeds into the inner wall of the housing 800.

[0051] This application provides a protruding snap-fit ​​portion 200 on the outer circumferential surface of the stator core body 100. When the stator core is installed into the housing 800 along the first direction, the snap-fit ​​portion 200 bends in the second direction due to the resistance of the housing 800, forming a barbed structure. This achieves self-locking and limiting of the body 100 along the second direction without interference fit or additional fasteners, effectively avoiding core tooth deformation and insulation problems caused by excessive interference. It also eliminates the need for space for pressure plates and bolts, facilitating overall miniaturization, simplifying installation procedures, and improving the reliability of axial fixation. Compared to traditional interference fits, the snap-fit ​​portion 200 solution does not require strict control of the tolerance zone between the outer diameter of the body 100 and the inner diameter of the housing 800, reducing processing difficulty and cost. Compared to fastening solutions using screws or rivets, the snap-fit ​​portion 200 solution does not require pre-machining threaded holes or through holes in the stator core or housing 800, avoiding stress concentration and material removal caused by hole machining.

[0052] like Figure 4 and Figure 5As shown, the body 100 includes a first stamped piece 110 and a second stamped piece 120. The first stamped piece 110 includes a first groove 111 corresponding to the snap-fit ​​portion 200. The snap-fit ​​portion 200 and the second stamped piece 120 are integrally formed. Since the snap-fit ​​portion 200 and the second stamped piece 120 are stamped from the same piece of silicon steel, they are made of the same material and have no weak points in connection, making them less prone to breakage when bent. The thickness of the snap-fit ​​portion 200 is the same as the thickness of the second stamped piece 120. Because they are both stamped from the same piece of silicon steel, no additional material is required.

[0053] The specific implementation of the one-piece molding is as follows: When punching the shape of the second blank 120, the outline of the snap-fit ​​portion 200 is reserved at the outer edge. The snap-fit ​​portion 200 remains connected to the main body of the second blank 120 and is not punched away. After punching, the snap-fit ​​portion 200 is still within the plane of the second blank 120, that is, the snap-fit ​​portion 200 and the second blank 120 are coplanar. In the subsequent stacking process, the snap-fit ​​portion 200 remains unbent. Only during the pressing into the housing 800 does the snap-fit ​​portion 200 bend.

[0054] Specifically, the outer edge of the first lamination 110 is provided with a plurality of first grooves 111 and a plurality of oil passage holes 112, which are alternately distributed along the circumferential direction. The first grooves 111 have a predetermined length along the circumferential direction, and the oil passage holes 112 are semi-circular.

[0055] The first lamination 110 is provided with a plurality of first oil passage holes 113 arranged sequentially along a spiral path. The line connecting the centers of the plurality of first oil passage holes 113 forms a spiral trajectory, and the spiral rotates around the center of the first lamination 110 once. The first oil passage holes 113 are circular.

[0056] The outer edge of the second lamination 120 is provided with a plurality of second grooves 121 and a plurality of oil inlet holes 122, which are alternately distributed along the circumferential direction. A snap-fit ​​portion 200 is disposed within the second groove 121, which provides space for the snap-fit ​​portion 200 to bend, preventing tearing at the root of the snap-fit ​​portion 200 due to stress concentration. The second groove 121 has a predetermined length along the circumferential direction, and the oil inlet holes 122 are V-shaped with their openings facing outwards in the radial direction. The inner ends of the plurality of oil inlet holes 122 (i.e., the ends closest to the center of the second lamination 120) correspond to the first oil passage holes 113 of the first lamination 110. Specifically, the second grooves 121 and the first grooves 111 are of equal length in the circumferential direction.

[0057] The second lamination 120 is provided with a plurality of second oil passage holes 123 distributed sequentially along a spiral path. The line connecting the centers of the plurality of second oil passage holes 123 forms a spiral trajectory, and the spiral rotates around the center of the second lamination 120 once.

[0058] The first groove 111, oil passage hole 112, second groove 121, and oil inlet hole 122 each have n elements, and the first oil passage hole 113 has 2n elements. The value of n is determined based on the number of motor poles and heat dissipation requirements.

[0059] like Figure 2 As shown, the body 100 includes, sequentially distributed along a first direction, a first component 130, at least one second component 140, and a third component 160. The third component 160 is located at the first direction end of the body 100, i.e., the end that enters first when pressed into the housing 800. The first component 130 is located at the second direction end of the body 100, i.e., the end that enters later when pressed into the housing 800. At least one second component 140 is located between the first component 130 and the third component 160.

[0060] The first component 130 includes a plurality of stacked first laminations 110, which rotate sequentially by a preset angle along a first rotation direction.

[0061] The second component 140 includes a plurality of first tabs 110 and a second tab 120 distributed along a first direction. The first grooves 111 of the plurality of second tabs 120 in the second component 140 are aligned to form a receiving groove 141 for accommodating the snap-fit ​​portion 200. The receiving groove 141 provides deformation space for the snap-fit ​​portion 200 during bending, preventing interference between the snap-fit ​​portion 200 and the first tabs 110. The number of first tabs 110 in each second component 140 can be adjusted as needed. The more first tabs 110 there are, the larger the axial dimension of the receiving groove 141, and the larger the axial receiving space when the snap-fit ​​portion 200 is bent.

[0062] The third component 160 includes a plurality of stacked first laminations 110, which rotate sequentially by a preset angle along a second rotation direction, the second rotation direction being opposite to the first rotation direction.

[0063] When the snap-fit ​​portion 200 on the outer periphery of the last layer of the second lamination 120 in the first direction is bent, the middle part of the second lamination 120 will arch in the first direction. This requires an additional structure to restrict the arching of the middle part of the second lamination 120 in the first direction. However, due to the functional requirements of the cooling oil circuit, the third component 160 cannot be set to a larger thickness to restrict the middle part of the second lamination 120.

[0064] like Figure 2As shown, the body 100 also includes a fourth component 150, which is located between the third component 160 and the second component 140 to limit the central portion of the last layer of second laminations 120 in the first direction from arching in the first direction. The fourth component 150 is located between the last layer of second laminations 120 and the third component 160 in the first direction, i.e., one side of the fourth component 150 contacts the last layer of second laminations 120, and the other side contacts the third component 160. The fourth component 150 includes a plurality of first laminations 110 distributed along the first direction, and the first grooves 111 of the plurality of second laminations in the fourth component 150 are aligned with each other.

[0065] The fourth component 150 is placed close to the side of the last layer of second laminations 120 near the third component 160. When the middle of the last layer of second laminations 120 tends to arch in the first direction, multiple first laminations 110 in the fourth component 150 press down on the middle of the second laminations 120 from the second direction side, preventing the middle of the second laminations 120 from arching and deforming. The arching deformation is caused by the following: when the locking part 200 is resisted by the housing 800 and bends in the second direction, the bending torque is transmitted to the main body of the second laminations 120, causing the middle of the second laminations 120 to warp in the first direction. Without the pressing effect of the fourth component 150, this warping would create a gap between the second laminations 120 and the adjacent first laminations 110, affecting the overall stiffness of the core and the continuity of the magnetic circuit. The fourth component 150, through the stacked weight and stiffness of the multiple first laminations 110, applies a reaction force from the second direction side to counteract the warping moment, keeping the second lamination 120 flat. The thickness of the fourth component 150 (i.e., the number of first laminations 110) is determined based on the actual amount of deformation.

[0066] The overall outline of the snap-fit ​​part 200 is rectangular or trapezoidal. A rectangular snap-fit ​​part 200 is simple to process, and the barb length remains consistent after bending. A trapezoidal snap-fit ​​part 200 is wider at the root and narrower at the top, resulting in less stress at the root during bending and making it less prone to breakage. For the rectangular snap-fit ​​part 200, its width (circumferential dimension) remains constant from the root to the end, requiring only simple straight-line punching during processing. For the trapezoidal snap-fit ​​part 200, its root width is greater than its end width, exhibiting a shape that is narrower at the top and wider at the bottom. This shape provides a larger load-bearing area at the root during bending, resulting in lower bending stress per unit area and thus reducing the likelihood of fatigue fracture. The narrower end of the trapezoidal snap-fit ​​part 200 allows for easier embedding into the inner wall of the housing 800, forming a deeper recess.

[0067] When the snap-fit ​​portion 200 is bent under stress, its axial dimension is smaller than that of the receiving groove 141 in the axial direction, so that the receiving groove 141 can accommodate the bent snap-fit ​​portion 200, thereby allowing the main body 100 to be smoothly installed into the housing 800 along the first direction. If the axial dimension of the bent snap-fit ​​portion 200 is too large, it will collide with the adjacent second component during the installation process, resulting in the inability to continue pressing in or damage to the snap-fit ​​portion 200 and the housing 800.

[0068] The circumferential dimension of the latching portion 200 is smaller than that of the first groove 111 in the circumferential direction, so as to ensure that the receiving groove 141 formed by the first groove 111 can not interfere with the bending of the latching portion 200 in the second direction. The circumferential gap means that the latching portion 200 can deflect freely within the receiving groove 141 without being stuck by the groove wall.

[0069] The hardness of the snap-fit ​​portion 200 is greater than that of the housing 800. After the snap-fit ​​portion 200 is pressed into the housing 800 and undergoes elastic deformation, it tends to spring back, applying a springback force to the housing 800, causing the bent snap-fit ​​portion 200 to make tight contact with the housing 800. Because the hardness of the snap-fit ​​portion 200 is greater than that of the housing 800, the bending of the snap-fit ​​portion 200 will deform the surface of the housing 800, forming a pit.

[0070] After assembly, the stator core may move relative to the housing 800 in a first direction (i.e., the pressing direction) or a second direction (i.e., the pulling direction).

[0071] The housing 800 can be equipped with a stepped positioning system, which restricts the movement of the stator core along the first direction (i.e., the pressing direction). Stepped positioning refers to a radially inwardly protruding annular step on the inner wall of the housing 800. When the stator core is pressed into the step position along the first direction, the end face of the stator core in that direction contacts the step, preventing further advancement. In this way, the step serves as an axial positioning element, ensuring the precise axial position of the stator core within the housing 800.

[0072] The bent snap-fit ​​part 200 will be snapped into the inner circumferential surface of the housing 800 and will be subjected to a uniform axial force in the circumferential direction, so that the stator core is evenly fixed in the housing 800 and will not be displaced.

[0073] The first lamination 110 and the second lamination 120 are typically made of silicon steel sheets, while the housing 800 is typically made of aluminum or magnesium alloy. Silicon steel sheets have high magnetic permeability and low iron loss, making them suitable as materials for motor cores. Aluminum and magnesium alloys have low density and good thermal conductivity, making them suitable as materials for the housing 800.

[0074] For housings 800 (especially magnesium alloy housings 800) that are prone to significant deformation due to temperature changes, such as when the motor is at high temperature or after the motor cools down, existing technologies using large interference fits cannot meet the requirements for such large deformations caused by temperature changes. This application forms a magnetically conductive structure through a bent snap-fit, eliminating the need for interference fits and adapting to various temperature-sensitive housings 800, greatly improving the versatility of the stator core. Under drastic temperature changes, interference fits may become clearance fits or generate excessive stress, while the barbed structure relies on mechanical snap-fit ​​rather than interference fits for fixation, thus being insensitive to differences in thermal expansion.

[0075] The difference in expansion between the housing 800 and the stator core increases significantly with rising temperatures. For an interference fit, this means the original interference may disappear, resulting in a clearance fit, causing the stator core to loosen within the housing 800. With the barbed structure in this application, as the temperature rises, the inner diameter of the housing 800 expands, but the springback force of the locking part 200 remains. The end of the locking part 200 moves outward with the expansion of the inner wall of the housing 800, maintaining contact and embedding. When the temperature decreases, the inner diameter of the housing 800 contracts, and the locking part 200 is pressed more tightly into the inner wall of the housing 800, thus enhancing the self-locking effect. Therefore, the barbed structure has an adaptive capability to temperature changes.

[0076] Multiple locking portions 200 on the same second lamination 120 are evenly distributed on the outer circumferential surface of the second lamination 120 to ensure uniform force on the same second lamination 120. This even distribution prevents the stator core from tilting due to excessive force on one side during pressing, while also ensuring consistent self-locking force in the circumferential direction. Because the multiple locking portions 200 on the same second lamination 120 are evenly distributed in the circumferential direction, the self-locking force provided by each locking portion 200 is uniform in the circumferential direction. When the stator core is subjected to an external force attempting to pull it out in the second direction, all locking portions 200 are simultaneously subjected to force, collectively resisting the pull-out force. This uniform force distribution prevents the stator core from tilting or becoming eccentric within the housing 800.

[0077] Multiple snap-fit ​​portions 200 on two adjacent second laminations 120 are staggered to prevent adjacent snap-fit ​​portions 200 from overlapping or interfering with each other after bending, ensuring that each snap-fit ​​portion 200 can independently snap into the inner wall of the housing 800. The staggered arrangement means that, in the circumferential direction, the angular position of the snap-fit ​​portion 200 on the upper layer of the second lamination 120 is offset from the angular position of the snap-fit ​​portion 200 on the lower layer of the second lamination 120 by an angle, usually equal to half the included angle between adjacent snap-fit ​​portions 200.

[0078] For example, if each layer has six snap-fit ​​parts 200 evenly spaced (60° interval), then adjacent layers can be staggered by 30°. This ensures that the snap-fit ​​part 200 of the upper layer is positioned precisely between the two snap-fit ​​parts 200 of the lower layer. This staggered arrangement prevents the snap-fit ​​parts 200 from overlapping axially, allowing each snap-fit ​​part 200 to directly contact the inner wall of the housing 800 without interference. If the two snap-fit ​​parts 200 are positioned exactly in the circumferential direction, the end of the snap-fit ​​part 200 of the upper layer might press against the root of the snap-fit ​​part 200 of the lower layer, affecting the bending and embedding effect of the lower layer.

[0079] This application also provides a stator assembly including the stator core described above.

[0080] This application also provides an electric motor, which includes: a housing 800 and the stator assembly described above.

[0081] This application also provides a vehicle including the aforementioned motor. The vehicle can be a fuel-powered vehicle, a new energy vehicle, etc. Specifically, it can be a hatchback, sedan, pickup truck, SUV, MPV, minivan, or off-road vehicle, etc. In new energy vehicles, the motor, as the core drive component, directly affects the vehicle's safety and service life due to its reliability and durability. The motor using the aforementioned stator core avoids the risk of insulation failure caused by core tooth deformation because it does not require interference fit; it reduces the number of parts and assembly steps, lowering costs, because it eliminates the need for pressure plates and bolts; and because the snap-fit ​​part 200 is insensitive to temperature changes, the motor can operate stably over a wider temperature range, adapting to the usage requirements of new energy vehicles under different climatic conditions.

[0082] The operation of the stator core of the embodiment of this application will be described below with reference to the accompanying drawings.

[0083] First, multiple first laminations 110 and second laminations 120 are stacked into the body 100 in a predetermined order. During stacking, the first component 130, at least one second component 140, the fourth component 150, and the third component 160 are arranged sequentially along a first direction and fixed together by rivets or welding. The snap-fit ​​portion 200 protrudes radially outward in its unbent state.

[0084] Then, the body 100 is placed into the press-fit fixture, aligning the axis of the body 100 with the axis of the housing 800. To avoid scratching the inner wall of the housing 800, a circular steel pre-guide fixture can be placed at the front end of the inner hole of the housing 800 before press-fitting. The outer diameter of the pre-guide fixture is slightly smaller than the inner diameter of the housing 800, and the inner diameter is slightly larger than the outer diameter of the body 100, guiding the body 100 smoothly into the housing 800. The pre-guide fixture is usually made of tool steel, and its inner hole has a chamfer or rounded corner. When the body 100 enters the pre-guide fixture, the locking part 200 first contacts the chamfer and is gradually pressed inward, resulting in pre-bending. In this way, when the body 100 enters the housing 800 from the pre-guide fixture, the locking part 200 is already in a partially bent state, avoiding sudden and violent impact.

[0085] The press is started, pushing the main body 100 into the housing 800 in the first direction. During the pressing process, the inner wall of the housing 800 presses against the locking part 200, forcing the locking part 200 to bend in the second direction and enter the receiving groove 141. As the pressing depth increases, the bent locking part 200 gradually embeds into the inner wall of the housing 800, forming a recess. Due to the presence of the pre-guided tooling, the locking part 200 has already undergone preliminary elastic deformation before entering the housing 800, preventing the tip of the locking part 200 from directly scraping the inner wall of the housing 800, thereby significantly reducing the generation of aluminum or magnesium shavings. If aluminum or magnesium shavings enter the motor, they may cause short circuits in the windings or wear on the bearings; therefore, reducing the generation of metal shavings is crucial for the reliability of the motor.

[0086] Once the main body 100 is pressed into place, the press retracts. At this time, due to the springback characteristics of the silicon steel sheet, the locking part 200 maintains tight contact with the recess. If the main body 100 is subjected to an external force attempting to pull it out in the second direction, the locking part 200 will further hook onto the edge of the recess, creating a self-locking mechanism to prevent the iron core from coming out.

[0087] Figure 6 This is a schematic diagram of the oil circuit structure provided in one embodiment of this application. Figure 7 Schematic diagram of the first branch road Figure 1 . Figure 8 Schematic diagram of the first branch road Figure 2 . Figure 9 This is a schematic diagram of the connection of the second branch. Figure 10 This is a schematic diagram of the third branch road. Figure 11 This is a partial schematic diagram of the casing. The oil passage structure is a cavity, which is not easily understood. To facilitate understanding of the specific shape of the cavity, [details omitted]. Figure 6 , Figures 8 to 10 These are all shapes corresponding to the oil circuit structure, to more intuitively illustrate the specific shape of the oil circuit, or to illustrate the shape of the cooling oil after the oil circuit structure is filled with cooling oil.

[0088] This application also provides an oil circuit structure, such as Figure 6 As shown, the oil circuit structure of this application includes: multiple first branch lines 300, multiple second branch lines 400 and multiple third branch lines 500.

[0089] Multiple first branches 300 are located on the outer circumferential surface of the stator core, each extending along the axial direction of the stator core. These multiple first branches 300 are evenly spaced along the circumferential direction of the stator core. This axially extending arrangement allows for uniform distribution of cooling oil along the entire length of the core, ensuring sufficient supply of cooling oil at every axial position on the outer circumferential surface of the stator core.

[0090] Multiple second branches 400 are located inside the stator core. Each second branch 400 extends inward along the radial direction of the stator core, and the outer end of the second branch 400 connects to the inner side of the first branch 300.

[0091] Multiple third branches 500 are located inside the stator core and distributed along the circumferential direction of the stator core. Each third branch 500 extends along the axial direction of the stator core and connects to a second branch 400. Specifically, the inner side of each third branch 500 connects to the inner end of the second branch 400. Cooling oil is radially guided through the second branch 400 and then flows into the third branch 500, and then flows axially, which can directly cool the internal area of ​​the stator core, thereby effectively reducing the temperature of the stator core.

[0092] This application integrates an oil circuit structure within the stator core, utilizing a first branch 300 extending axially on the outer circumference, a second branch 400 extending radially inward, and a third branch 500 extending axially internally, sequentially connected to form a complete cooling oil circuit embedded within the core. Multiple branches form multiple cooling channels, increasing the total flow area, reducing flow resistance, and thus improving cooling efficiency. Consequently, the cooling oil can be guided and distributed without the need for an additional oil injection ring, saving space for the oil injection ring and its associated components. This results in a more compact overall structure, facilitating miniaturization design, while also reducing the number of parts and assembly complexity.

[0093] Multiple first branch lines 300 are evenly distributed along the circumference of the stator core to form a uniform oil supply path in the circumferential direction, ensuring that the flow rate of cooling oil entering the stator core is consistent in the circumferential direction, and avoiding the situation where some areas have sufficient oil supply while relatively other areas have insufficient oil supply.

[0094] like Figure 7 and Figure 8As shown, the first branch 300 includes a first sealing path 310, an extension path, and a second sealing path 320 distributed along the axial direction of the stator core. The multiple extension paths in the circumferential direction are divided into a first extension path 330A and a second extension path 330B, which are alternately distributed in sequence.

[0095] Among them, such as Figure 9 and Figure 10 As shown, both the first sealing path 310 and the second sealing path 320 include multiple elongated segments 311 and multiple conductive segments 312 distributed axially at intervals. The conductive segments 312 connect adjacent elongated segments 311. For the same elongated segment 311, two conductive segments 312 located on either side of its axial direction are respectively disposed at two opposite ends of the segment 311 in the circumferential direction. Furthermore, the conductive segment 312 between adjacent elongated segments 311 connects to the same end of the adjacent segments 311 in the circumferential direction, thus forming a zigzag channel in both the first sealing path 310 and the second sealing path 320. When the cooling oil flows axially in this zigzag channel, it repeatedly changes direction in the circumferential direction, forming a tortuous flow path in the axial direction. This tortuous path effectively increases the axial flow resistance of the oil passage, thereby providing a sealing effect at the axial end face of the oil passage and reducing leakage of cooling oil from the end face gap.

[0096] The first sealing path 310 is formed by stacking multiple first laminations 110. The multiple first laminations 110 are rotated sequentially along the circumferential direction by a preset angle, which is the interval angle between adjacent first grooves 111 and oil passage holes 112. Among them, the first grooves 111 form an elongated segment 311, and the oil passage holes 112 form a conductive segment 312.

[0097] The first groove 111 and the oil passage hole 112 are stacked on each other. Since the thickness of the first stamp 110 is relatively thin, the end face gap between adjacent stamps after stacking is extremely small. When the cooling oil leaks outward from the end face gap, it needs to flow through an extremely narrow micro-slit channel. The oil path resistance is very large, so the leakage is very small. This ensures that most of the cooling oil flows along the preset zigzag channel, reducing oil loss and improving cooling efficiency.

[0098] The plurality of first laminations 110 corresponding to the first sealing path 310 rotate sequentially by a preset angle along a first rotation direction in the circumferential direction, and the plurality of first laminations 110 corresponding to the second sealing path 320 rotate sequentially by a preset angle along a second rotation direction in the circumferential direction, the second rotation direction being opposite to the first rotation direction. That is, zigzag sealing channels with opposite folding directions are formed at both ends of the stator core, the resistance encountered by the cooling oil when flowing at both ends of the axial direction is opposite, which is conducive to balancing the pressure distribution of the oil passages at both ends of the axial direction, and further reduces the leakage of cooling oil from the gap between the two end faces.

[0099] like Figure 7 and Figure 8 As shown, the multiple extension paths are divided into a first extension path 330A and a second extension path 330B, which are alternately distributed along the circumferential direction. Both the first extension path 330A and the second extension path 330B extend along the axial direction of the stator core.

[0100] The first extension path 330A includes multiple first extension segments 331, second extension segments 332, third extension segments 333 and fourth extension segments 334 that alternate sequentially along the axial direction, that is, the first extension segments 331, second extension segments 332, third extension segments 333 and fourth extension segments 334 appear in sequence along the axial direction from one end to the other.

[0101] The second extension path 330B includes multiple third extension segments 333, fourth extension segments 334, first extension segments 331 and second extension segments 332 that alternate sequentially along the axial direction. That is, the third extension segment 333, fourth extension segment 334, first extension segment 331 and second extension segment 332 appear in sequence along the axial direction from one end to the other.

[0102] At the same axial position, the adjacent first extension path 330A and second extension path 330B have different types of extension sections, which makes the local structure through which the cooling oil flows in the two adjacent extension paths different, thus making the distribution of the cooling oil flow characteristics in the circumferential direction more uniform.

[0103] like Figure 7 and Figure 8 As shown, the extension path is formed by stacking multiple stacked components, which include a first base layer, a second base layer, a third base layer, and a fourth base layer distributed sequentially.

[0104] The first base layer includes multiple first stamping plates 110, the second base layer includes one second stamping plate 120, the third base layer includes multiple first stamping plates 110, and the fourth base layer includes one second stamping plate 120.

[0105] The first extension section 331 of the first extension path 330A is formed by stacking the oil passage holes 112 of a plurality of first stamps 110 of the first base layer. The second extension section 332 of the first extension path 330A is formed by a portion of the oil inlet hole 122 of the second stamp 120 of the second base layer. The third extension section 333 of the first extension path 330A is formed by stacking the first grooves 111 of a plurality of first stamps 110 of the third base layer. The fourth extension section 334 of the first extension path 330A is formed by the second groove 121 of the second stamp 120 of the fourth base layer.

[0106] The third extension section 333 of the second extension path 330B is formed by stacking the first grooves 111 of a plurality of first stamps 110 of the first base layer. The fourth extension section 334 of the second extension path 330B is formed by the second grooves 121 of the second stamps 120 of the second base layer. The first extension section 331 of the second extension path 330B is formed by stacking the oil passage holes 112 of a plurality of first stamps 110 of the third base layer. The second extension section 332 of the second extension path 330B is formed by a portion of the oil inlet hole 122 of the second stamps 120 of the fourth base layer.

[0107] Since the first and third base layers both use multiple first laminations 110 stacked together, while the second and fourth base layers both use a single second lamination 120, the different number of laminations in different base layers results in differences in the axial flow cross-sectional area of ​​the channels formed after stacking. This creates alternating local flow channel shapes in the extension path, which helps to adjust the flow rate and pressure distribution of the cooling oil at different axial positions. This allows the cooling oil to flow more evenly through each area along the entire axial length of the stator core, avoiding situations where the local flow rate is too high or too low, thereby improving the uniformity and stability of the overall cooling effect.

[0108] like Figure 9 As shown, the second branch 400 is formed by a portion of the oil inlet 122 of the second lamination 120. The oil inlet 122 extends radially along the second lamination 120, with its outer end connecting to the inner side of the first branch 300 and its inner end connecting to the third branch 500, thereby guiding the cooling oil from the first branch 300 located on the outer circumference of the stator core to the third branch 500 located inside the stator core. The second branch 400 serves as a radial transition channel, allowing the cooling oil to change from axial to radial flow within the stator core, and then enter the third branch 500 to continue flowing axially. The oil inlet 122 on the second lamination 120 is V-shaped with its opening facing outward in the radial direction. The width of the outer end of the V-shaped opening is greater than the width of the inner end. This gradual shape facilitates a smooth transition in the flow velocity of the cooling oil when it enters from the first branch 300, reducing pressure loss and turbulence noise caused by abrupt changes in cross-section.

[0109] like Figure 10 As shown, the third branch 500 includes a first distribution path 510, an oil injection path, and a second distribution path 520 distributed along the axial direction of the stator core. The multiple oil injection paths in the circumferential direction are divided into a first oil injection path 530A and a second oil injection path 530B, which are alternately distributed in sequence.

[0110] The first distribution path 510 and the second distribution path 520 are both formed by stacking the first oil passage hole 113 of the first punch 110.

[0111] like Figure 10As shown, the multiple injection paths in the circumferential direction are divided into a first injection path 530A and a second injection path 530B, which are alternately distributed in sequence. The first injection path 530A includes multiple first injection segments 531, second injection segments 532, third injection segments 533, and fourth injection segments 534, which are alternately distributed in the axial direction. The second injection path 530B includes multiple third injection segments 533, fourth injection segments 534, first injection segments 531, and second injection segments 532, which are alternately distributed in the axial direction. The alternating distribution of the injection paths is the same as that of the extension paths, ensuring that the flow characteristics of the third branch 500 are uniform in the circumferential direction.

[0112] The first injection section 531 of the first injection path 530A is formed by stacking the first oil passage holes 113 of multiple first stampings 110 of the first base layer. The second injection section 532 of the first injection path 530A is formed by a part of the oil inlet hole 122 of the second stamping 120 of the second base layer. The third injection section 533 of the first injection path 530A is formed by stacking the first oil passage holes 113 of multiple first stampings 110 of the third base layer. The fourth injection section 534 of the first injection path 530A is formed by a part of the oil inlet hole 122 of the second stamping 120 of the fourth base layer.

[0113] The third injection section 533 of the second injection path 530B is formed by stacking the first oil passage holes 113 of multiple first stampings 110 of the first base layer. The fourth injection section 534 of the second injection path 530B is formed by a part of the oil inlet hole 122 of the second stamping 120 of the second base layer. The first injection section 531 of the second injection path 530B is formed by stacking the first oil passage holes 113 of multiple first stampings 110 of the third base layer. The second injection section 532 of the second injection path 530B is formed by a part of the oil inlet hole 122 of the second stamping 120 of the fourth base layer. In the first oil injection path 530A, the first oil injection section 531 and the third oil injection section 533 are both formed by stacking the first oil passage holes 113, and the second oil injection section 532 and the fourth oil injection section 534 are both formed by a portion of the oil inlet hole 122. In the second oil injection path 530B, the third oil injection section 533 and the first oil injection section 531 are also formed by stacking the first oil passage holes 113, and the fourth oil injection section 534 and the second oil injection section 532 are also formed by a portion of the oil inlet hole 122. That is to say, the first oil injection path 530A and the second oil injection path 530B each have two different types of oil injection sections arranged alternately. The two types of oil injection sections are staggered in the axial direction, so that the oil injection nozzles are staggered in the axial direction, thereby achieving uniform oil spraying at multiple axial positions of the stator core, avoiding insufficient or excessive local cooling, and improving the uniformity and stability of overall cooling.

[0114] like Figure 6 and Figure 11As shown, the oil circuit structure of this application also includes an oil inlet 700, which is located on the inner circumferential surface and inside of the housing 800. The oil inlet 700 corresponds to the middle part of the axial direction of the stator core and includes: a first branch 710, a second branch 720, a connecting groove 730 and a plurality of annular guide grooves 740.

[0115] The first branch line 710 is located inside the housing 800 and extends along the axial direction of the stator core. The top end of the first branch line 710 connects to the end face of the housing 800. Cooling oil enters the first branch line 710 from outside the end face of the housing 800 through this top end and flows axially to the middle region of the housing 800. An oil pipe joint or sealing structure can be provided at the top opening of the first branch line 710 for connecting to an external oil supply line to ensure that cooling oil is smoothly introduced into the housing 800 from the external system.

[0116] The second branch 720 is located inside the housing 800 and extends inward along the radial direction of the stator core. The second branch 720 is located in the middle of the housing 800 in the axial direction, and its outer end connects to the first branch 710. After flowing along the first branch 710 to the middle of the housing 800, the cooling oil turns radially inward from the first branch 710 via the second branch 720, flowing from the outer periphery of the housing 800 to the inner periphery.

[0117] The connecting groove 730 is located on the inner circumferential surface of the housing 800. The connecting groove 730 extends axially and connects to the inner end of the second branch 720. Cooling oil flows through the second branch 720 to the inner circumferential surface of the housing 800 and then enters the connecting groove 730, expanding axially to both sides along the connecting groove 730.

[0118] The annular guide groove 740 connects to the connecting groove 730. Multiple annular guide grooves 740 are distributed along the axial direction, each extending circumferentially along the inner circumferential surface of the housing 800, forming an annular groove structure. The radially outer side of the first branch 300 connects to multiple annular guide grooves 740. After being diverted through the connecting groove 730 to each annular guide groove 740, the cooling oil is evenly distributed circumferentially and then flows into the first branch 300 on the outer circumferential surface of the stator core from the annular guide groove 740, thus completing the transition and distribution of cooling oil from the outside of the housing to the inside of the stator core. By placing the oil inlet on the axial end face of the housing 800, axial connection of external oil pipes is facilitated, reducing the space occupied in the radial direction of the housing 800 and contributing to the radial miniaturization design of the entire machine.

[0119] The flow direction of the cooling oil in the above-mentioned oil circuit structure is as follows: the cooling oil flows sequentially through the first branch 710, the second branch 720, the connecting groove 730, the annular guide groove 740, the middle of the first branch 300, the second branch 400, and the middle of the third branch 500, and flows from the middle of the third branch 500 to both ends of the third branch 500 in the axial direction. Among them, the first sealing passage 310 and the second sealing passage 320 at both ends of the first branch 300 in the axial direction each form a tortuous flow path, which can effectively increase the flow resistance of the oil circuit in the axial direction, thereby playing a sealing role at the axial end face of the oil circuit and reducing the leakage of cooling oil from the end face gap.

[0120] This application also provides an electric motor that includes the above-described oil circuit structure.

[0121] This application also provides a vehicle including the aforementioned motor. The vehicle can be a fuel-powered vehicle, a new energy vehicle, etc. Specifically, it can be a hatchback, sedan, pickup truck, SUV, MPV, minivan, or off-road vehicle, etc. In new energy vehicles, the motor, as the core drive component, directly affects the vehicle's safety and service life due to its reliability and durability. The motor using the aforementioned stator core avoids the risk of insulation failure caused by core tooth deformation because it does not require interference fit; it reduces the number of parts and assembly steps, lowering costs, because it eliminates the need for pressure plates and bolts; and because the snap-fit ​​part 200 is insensitive to temperature changes, the motor can operate stably over a wider temperature range, adapting to the usage requirements of new energy vehicles under different climatic conditions. The aforementioned oil circuit structure allows cooling oil to flow directly through the interior of the stator core, significantly improving cooling efficiency compared to traditional external spraying methods. This effectively controls the temperature rise of the motor under high-load continuous operation, extends the motor's service life, and ensures the stability of the vehicle's power performance under high-power output conditions such as climbing and high-speed cruising.

[0122] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oil passage structure characterized by comprising: The oil circuit structure includes: Multiple first branches are located on the outer peripheral surface of the stator core, and each first branch extends along the axial direction of the stator core. Multiple second branches are located inside the stator core, each second branch extending inward along the radial direction of the stator core, and the second branch connecting to the first branch; Multiple third branches are located inside the stator core, each of the third branches extends along the axial direction of the stator core, and each of the third branches is connected to the second branch.

2. The oil passage structure according to claim 1, characterized by The first branch includes a first sealing path, an extension path, and a second sealing path distributed along the axial direction of the stator core; The first sealing path and the second sealing path each include multiple elongated segments and multiple conductive segments distributed at intervals along the axial direction. The multiple conductive segments respectively connect two adjacent elongated segments. For the same elongated segment, two conductive segments located on both sides of its axial direction are respectively disposed at two opposite ends of the elongated segment along the circumferential direction, and the conductive segment located between two adjacent elongated segments connects the same end of the two adjacent elongated segments along the circumferential direction.

3. The oil passage structure according to claim 2, characterized by The first sealing path is formed by stacking multiple first stamps. The outer edge of the first stamp is provided with multiple first grooves and multiple oil passage holes. The multiple first grooves and multiple oil passage holes are alternately distributed along the circumferential direction. Multiple first laminations rotate sequentially by a preset angle along the circumferential direction, the preset angle being the interval angle between adjacent first grooves and oil passage holes; The first groove forms the elongated segment, and the oil passage hole forms the conductive segment.

4. The oil passage structure according to claim 3, characterized by The plurality of first stamps corresponding to the first sealing path rotate sequentially by a preset angle along a first rotation direction in the circumferential direction, and the plurality of first stamps corresponding to the second sealing path rotate sequentially by a preset angle along a second rotation direction in the circumferential direction, wherein the second rotation direction and the first rotation direction are opposite.

5. The oil passage structure according to claim 3, characterized by The multiple extension paths are divided into a first extension path and a second extension path that are alternately distributed along the circumferential direction. The first extension path includes multiple first extension segments, second extension segments, third extension segments and fourth extension segments that are alternately distributed along the axial direction. The second extension path includes multiple third extension segments, fourth extension segments, first extension segments and second extension segments that are alternately distributed along the axial direction.

6. The oil passage structure according to claim 5, characterized by The extension path is formed by stacking the first lamination and the second lamination; The outer edge of the second lamination is provided with a plurality of second grooves and a plurality of oil inlet holes, and the second grooves and the oil inlet holes are alternately distributed along the circumferential direction; The first extension is formed by stacking the oil passage holes, the second extension is formed by a portion of the oil inlet hole, the third extension is formed by stacking the first groove, and the fourth extension is formed by the second groove.

7. The oil passage structure according to claim 6, characterized by The oil inlet extends along the radial direction of the stator core, and the second branch is formed as a part of the oil inlet.

8. The oil passage structure according to claim 6, characterized by The first lamination is provided with a plurality of first oil passage holes distributed sequentially along a spiral path; The third branch includes a first distribution path, an oil injection path, and a second distribution path distributed along the axial direction of the stator core. Both the first distribution path and the second distribution path are formed by stacking the first oil passage holes of the first lamination.

9. The oil circuit structure according to claim 8, characterized in that, The multiple fuel injection paths in the circumferential direction are divided into a first fuel injection path and a second fuel injection path that are alternately distributed in sequence. The first fuel injection path includes a multiple first fuel injection segment, a second fuel injection segment, a third fuel injection segment and a fourth fuel injection segment that are alternately distributed in sequence along the axial direction. The second fuel injection path includes a multiple third fuel injection segment, a fourth fuel injection segment, a first fuel injection segment and a second fuel injection segment that are alternately distributed in sequence along the axial direction. The first injection section is formed by stacking the first oil passage holes, the second injection section is formed by a portion of the oil inlet hole, the third injection section is formed by stacking the first oil passage holes, and the fourth injection section is formed by a portion of the oil inlet hole.

10. The oil circuit structure according to claim 1, characterized in that, The oil circuit structure also includes an oil inlet, which is located on the inner circumferential surface and inside the housing. The oil inlet corresponds to the axial center of the stator core and includes: The first branch is located inside the housing and extends along the axial direction of the stator core, with the top end of the first branch connected to the end face of the housing. The second branch is located inside the housing and extends inward along the radial direction of the stator core. The second branch is located in the middle of the axial direction of the housing, and the outer end of the second branch is connected to the first branch. A connecting groove is located on the inner circumferential surface of the housing, the connecting groove extends axially and connects to the inner end of the second branch; Multiple annular guide channels, each of which is connected to the connecting channel, each of which is distributed along the axial direction, and each of the first branches is connected to multiple annular guide channels.

11. An electric motor, characterized in that, The motor includes the oil circuit structure as described in any one of claims 1-10.

12. A vehicle, characterized in that, The vehicle includes the motor as described in claim 11.

Images