A motor with oil injection and direct cooling function

Abstract

This invention relates to the field of motor technology and discloses a motor with direct oil-injection cooling function, including a motor housing and a stator core fixed inside the motor housing. The stator core includes a left tail ring, multiple left rings, multiple middle rings, multiple right rings, and a right tail ring coaxially stacked from left to right. Oil forms a three-dimensional flow network inside the stator core, covering the entire internal space of the core. During the flow of oil through the bottom arc groove, the left straight cylindrical mesh channel, the right straight cylindrical mesh channel, and the axial straight groove, the oil directly contacts the stator core, absorbing the heat generated by the stator windings and the core. The heat is rapidly carried away, avoiding the formation of localized hot spots and achieving direct and efficient cooling of the heat source core. The oil, after absorbing heat, is discharged from the oil outlet holes of the left and right tail rings and returns to the external cooling system for circulation cooling. The design of the oil outlet holes ensures smooth oil flow and prevents oil accumulation.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and specifically to a motor with oil injection direct cooling function. Background Technology

[0002] In the field of motor technology, heat dissipation performance is a core factor affecting motor efficiency, reliability, and lifespan. During operation, the stator windings and core of a motor generate a large amount of heat due to electromagnetic and mechanical losses. If this heat cannot be dissipated in time, it will lead to excessive temperature rise in the motor, not only reducing motor efficiency and lifespan but also potentially causing malfunctions in severe cases. Existing heat dissipation solutions, such as those disclosed in Chinese Utility Model Patent CN223273969U (Motor Housing Water-Cooling Heat Dissipation Device), involve several cooling pipes with both ends connected to one side of a first square tube and a second square tube, respectively. The outer surfaces of these cooling pipes are tightly attached to the outer surface of the motor housing. Cooling is primarily achieved through heat exchange between the fluid within the cooling pipes and the motor housing, with the cooling pipes pressed tightly against the outer surface of the motor housing. This external cooling method has significant limitations. First, heat must be conducted from the internal stator core to the casing, which involves a long path, high thermal resistance, and low heat dissipation efficiency. Second, cooling is mainly concentrated in the casing area, making it difficult to quickly and directly cool the core heat source, the stator core, resulting in heat accumulation inside and the formation of local hot spots. Summary of the Invention

[0003] The main objective of this invention is to provide a motor with direct oil-injection cooling function, in order to solve the problem that the cooling of existing motor housing liquid cooling devices is mainly concentrated in the housing area, making it difficult to quickly and directly cool the core stator iron core, the heat source, resulting in heat accumulation inside and the formation of local overheating points.

[0004] To achieve the above objectives, the present invention provides a motor with direct oil injection cooling function, including a motor housing and a stator core fixed inside the motor housing.

[0005] The stator core includes a left tail ring, multiple left rings, multiple middle rings, multiple right rings and a right tail ring that are coaxially stacked from left to right. Both the left tail ring and the right tail ring have multiple oil outlet holes.

[0006] The left ring, middle ring and right ring are all provided with bottom arc grooves and multiple through grooves along their axial direction;

[0007] The bottom arc groove and multiple through grooves are arranged circumferentially on the left ring, middle ring and right ring;

[0008] Multiple bottom arc grooves are interconnected, and two adjacent left rings are staggered and their through grooves are connected, so that the through grooves of multiple left rings are connected to form a left straight cylindrical mesh channel. The top side of the left straight cylindrical mesh channel is connected to the oil outlet of the left tail ring, and the bottom end is connected to multiple bottom arc grooves.

[0009] The two adjacent right rings are staggered and their through slots are connected, so that the through slots of multiple right rings form a right straight cylindrical mesh channel. The top side of the right straight cylindrical mesh channel is connected to the oil outlet of the right tail ring, and the bottom end is connected to multiple bottom arc grooves.

[0010] Multiple central rings are arranged in an overlapping manner along the axial direction, so that multiple through slots form multiple axial straight slots;

[0011] Multiple axial straight grooves are circumferentially arranged on multiple middle rings, and their two ends are respectively connected to the right straight cylindrical mesh channel and the left straight cylindrical mesh channel;

[0012] Each middle ring wall has an oil inlet, which is connected to the bottom arc groove.

[0013] A preferred embodiment is that the inner diameters of the left tail ring, multiple left rings, multiple middle rings, multiple right rings, and the right tail ring are all the same, and the outer diameters of all five are also the same.

[0014] A preferred embodiment is that multiple limiting grooves are formed on the circumference of the left tail ring, multiple left rings, multiple middle rings, multiple right rings, and the right tail ring near their inner rings. The multiple limiting grooves form multiple slots for winding the metal coils, and the multiple slots are arranged circumferentially on the stator core.

[0015] A preferred embodiment is that there is at least one left tail ring and one right tail ring;

[0016] The left tail ring, multiple left rings, multiple middle rings, multiple right rings, and the right tail ring are coaxially welded sequentially from left to right.

[0017] A preferred solution is to have an oil inlet hole at the bottom of the motor housing, which is connected to the oil inlet port;

[0018] The bottom of the motor housing has a liquid tank located directly below the stator core, with a drain hole at one end.

[0019] The motor with direct oil injection cooling function also includes a connecting pipe, along which an oil pump and a heat exchanger are arranged, and both ends are connected to a leak hole and an oil inlet hole, respectively.

[0020] A preferred embodiment is that the motor with direct oil injection cooling function also includes two inner arc-shaped shells, multiple delivery pipes, and multiple support rods;

[0021] One side of each inner arc-shaped shell is a first opening, and the two ends of multiple support rods pass through the first opening and are fixedly connected to the two inner arc-shaped shells respectively;

[0022] Multiple internal injection holes are opened on the inner sidewall of each inner arc-shaped shell along its direction;

[0023] The stator core has an arc-shaped groove running through it along its axis. An outer arc-shaped shell is fixed to one side wall of both the left and right tail rings. The two outer arc-shaped shells are symmetrically connected and arranged on both sides of the arc-shaped groove.

[0024] Each outer arc-shaped shell has a second opening on one side, and multiple sets of spray groups are evenly distributed along the axial direction of the stator core on the inner sidewall.

[0025] Each group of spraying groups includes multiple external spray holes, which are arranged at intervals along the curvature of the outer arc shell.

[0026] The inner cavities of the two sets of outer arc-shaped shells and the arc-shaped grooves form a slide;

[0027] The two ends of multiple conveying pipes are connected to the middle part of the slide and the oil outlet, respectively, and each pipe corresponds to one of the multiple oil outlets.

[0028] Two inner arc-shaped shells are slidably disposed in the slide rail, and each inner arc-shaped shell is connected to a drive mechanism for driving it to slide along the slide rail;

[0029] When the inner arc-shaped shell slides to a specific position, its inner injection hole can be aligned with the outer injection hole in a injection group.

[0030] A preferred embodiment is that the drive mechanism is located inside the motor housing and includes a drive gear, a driven gear, and a connecting rod;

[0031] The drive gear is fixedly sleeved on the rotor shaft of the motor;

[0032] The driven gear is rotatably mounted on the motor housing via a rotating shaft and meshes with the drive gear;

[0033] A support ring is coaxially fixed to the end face of the driven gear via multiple supporting rods;

[0034] A universal joint is eccentrically mounted on the end face of the support ring;

[0035] A guide tube is fixedly connected to any outer arc-shaped shell;

[0036] The sidewall of the inner arc-shaped shell is slidably connected to the guide tube via a push-pull rod;

[0037] One end of the connecting rod is hinged to the universal joint, and the other end is hinged to the push-pull rod.

[0038] A preferred embodiment is that the drive gear is an incomplete gear, which is configured to drive the driven gear to rotate intermittently;

[0039] The two inner arc-shaped shells are driven to slide intermittently back and forth in the slide rail via the connecting rod and push-pull rod.

[0040] During the movement of the two inner arc-shaped shells, the spray groups on the two outer arc-shaped shells spray alternately.

[0041] A preferred embodiment is that the motor with direct oil injection cooling function also includes a control unit, which includes a lead screw and a moving block;

[0042] The end face of the support ring is provided with a movable groove along its radial direction. The movable block is slidably embedded in the movable groove and is screwed onto the lead screw. The lead screw is rotated in the movable groove along the length direction of the movable groove.

[0043] The movable block is equipped with a universal joint, and the free end of the universal joint is hinged to the end of the connecting rod away from the guide tube.

[0044] The beneficial effects of the above scheme are as follows:

[0045] Cooling oil is injected from the external cooling system through inlets on each middle ring. These inlets connect to the bottom arc grooves of the middle rings, allowing the oil to enter first. These bottom arc grooves are circumferentially arranged on multiple middle rings and interconnected, enabling rapid oil distribution and forming a basic cooling oil distribution layer. Further, the oil injected into the bottom arc grooves flows upwards through two main paths, formed by interconnected channels created by multiple staggered left rings. The oil enters the bottom end of the left straight-cylinder mesh channel from the bottom arc groove and flows upwards along the channel, eventually reaching the oil outlet of the left tail ring. Similarly, the oil enters the bottom end of the right straight-cylinder mesh channel from the bottom arc groove and flows upwards along the channel, eventually reaching the oil outlet of the right tail ring. These two straight-cylinder mesh channels act as a radial oil circuit network, ensuring the oil flows from the inside of the core to both ends. Simultaneously, multiple middle rings are arranged axially overlapping, their channels forming multiple axial straight grooves (axial channels). These axial straight slots are arranged circumferentially and connected at both ends to the left and right straight cylindrical mesh channels, respectively. Therefore, some oil enters the axial straight slots from the bottom arc slots, flowing axially and shuttling between the left and right straight cylindrical mesh channels. In this way, the oil forms a three-dimensional flow network inside the stator core, covering the entire internal space of the core. During the flow of the oil through the bottom arc slots, the left and right straight cylindrical mesh channels, and the axial straight slots, the oil directly contacts the stator core, absorbing the heat generated by the stator windings and the core. Because the oil passages are directly embedded inside the core, the heat is quickly carried away, avoiding the formation of localized hot spots and achieving direct and efficient cooling of the heat source core. The oil, after absorbing heat, is discharged from the oil outlets of the left and right tail rings, returning to the external cooling system for recirculation. The design of the oil outlets ensures smooth oil flow and prevents oil accumulation. Attached Figure Description

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0048] Figure 2 This is a schematic diagram of the three-dimensional structure of the stator core of the present invention;

[0049] Figure 3 yes Figure 2 A structural schematic diagram in cross-sectional view;

[0050] Figure 4 yes Figure 2 Another structural diagram from a different perspective;

[0051] Figure 5 yes Figure 1 A front view diagram of the cross-section structure;

[0052] Figure 6 yes Figure 5 Enlarged structural diagram of region A in the middle;

[0053] Figure 7 yes Figure 1 A three-dimensional structural diagram in cross-sectional view;

[0054] Figure 8 yes Figure 7 Partial structural diagram;

[0055] Figure 9 yes Figure 8 A partial cross-sectional structural diagram;

[0056] Figure 10 yes Figure 9 Partial structural diagram;

[0057] Figure 11 This is a three-dimensional structural diagram of the two inner arc-shaped shells and multiple support rods of the present invention;

[0058] Figure 12 This is a partial structural schematic diagram of the present invention.

[0059] Explanation of reference numerals in the attached figures

[0060] 1. Motor housing; 11. Oil inlet; 12. Liquid tank; 13. Leakage hole; 14. Rotor shaft;

[0061] 2. Stator core; 21. Left tail ring; 22. Left ring; 23. Middle ring; 24. Right ring; 25. Right tail ring; 26. Oil outlet; 27. Through groove; 28. Bottom arc groove; 29. ​​Left straight cylindrical mesh channel; 201. Limiting groove; 202. Strip groove; 210. Right straight cylindrical mesh channel; 211. Axial straight groove; 212. Oil inlet; 20. Stator winding assembly; 200. Arc groove;

[0062] 3. Inner arc-shaped shell; 31. Inner injection hole;

[0063] 4. Support rod;

[0064] 5. Outer arc-shaped shell; 51. Injection assembly; 510. Outer injection port;

[0065] 6. Slide;

[0066] 7. Drive mechanism; 71. Drive gear; 72. Driven gear; 73. Guide tube; 74. Connecting rod; 75. Rotating shaft; 76. Support rod; 78. Support ring; 79. Push-pull rod; 790. Universal joint; 780. Moving groove;

[0067] 8. Control unit; 81. Lead screw; 82. Moving block;

[0068] 9. Delivery pipe. Detailed Implementation

[0069] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0070] First embodiment:

[0071] like Figures 1-4 As shown, this embodiment provides a motor with direct oil-injection cooling function, including a motor housing 1 and a stator core 2 fixed inside the motor housing 1. The stator core 2 includes a left tail ring 21, multiple left rings 22, multiple middle rings 23, multiple right rings 24, and a right tail ring 25 coaxially stacked from left to right. Both the left tail ring 21 and the right tail ring 25 have multiple oil outlet holes 26. The inner diameters of the left tail ring 21, multiple left rings 22, multiple middle rings 23, multiple right rings 24, and right tail ring 25 are all the same, and their outer diameters are also the same. This design greatly simplifies mold design and machining processes. All ring parts can be machined using the same datum, achieving standardization and universality of parts, effectively reducing production costs and improving processing efficiency. Figure 2 As shown, multiple limiting grooves 201 are formed on the circumference of the left tail ring 21, multiple left rings 22, multiple middle rings 23, multiple right rings 24, and right tail ring 25 near their inner rings. These limiting grooves 201 form multiple grooves 202 for winding the metal coils, and these grooves 202 are arranged circumferentially on the stator core 2. There is at least one left tail ring 21 and one right tail ring 25. Figure 3As shown, the left tail ring 21, multiple left rings 22, multiple middle rings 23, multiple right rings 24, and right tail ring 25 are coaxially welded from left to right. Each of the left rings 22, middle rings 23, and right rings 24 has a bottom arc groove 28 and multiple through grooves 27 extending along its axial direction. The bottom arc grooves 28 and multiple through grooves 27 are circumferentially arranged on the left rings 22, middle rings 23, and right rings 24. The multiple bottom arc grooves 28 are interconnected, and adjacent left rings 22 are staggered, with their through grooves 27 connected, forming a left straight cylindrical mesh channel 29. The top end of the left straight cylindrical mesh channel 29 is connected to the oil outlet 26 of the left tail ring 21, and the bottom end of the left straight cylindrical mesh channel 29 is connected to the multiple bottom arc grooves 28. Two adjacent right rings 24 are staggered, and their through slots 27 are connected, forming a right straight cylindrical mesh channel 210. The top end of the right straight cylindrical mesh channel 210 is connected to the oil outlet 26 of the right tail ring 25, and the bottom end of the right straight cylindrical mesh channel 210 is connected to multiple bottom arc grooves 28. Multiple middle rings 23 are arranged overlapping axially, forming multiple axial straight grooves 211. The multiple axial straight grooves 211 are circumferentially arranged on the multiple middle rings 23, and their two ends are connected to the right straight cylindrical mesh channel 210 and the left straight cylindrical mesh channel 29, respectively. Figure 2 As shown, each of the middle rings 23 has an oil inlet 212 on its ring wall, and the oil inlet 212 is connected to the bottom arc groove 28.

[0072] Cooling oil is injected from the external cooling system through inlets 212 on each of the middle rings 23. Inlets 212 connect to the bottom arc grooves 28 of the middle rings 23, so the oil first enters the bottom arc grooves 28. The oil rapidly distributes within the bottom arc grooves 28, forming a basic cooling oil distribution layer. Further, the oil injected into the bottom arc grooves 28 flows upward through two main paths. Path one: oil enters the bottom end of the left straight-tube mesh channel 29 from the bottom arc groove 28 and flows upward along the left straight-tube mesh channel 29, eventually reaching the oil outlet 26 of the left tail ring 21. Path two: oil similarly enters the bottom end of the right straight-tube mesh channel 210 from the bottom arc groove 28 and flows upward along the right straight-tube mesh channel 210, eventually reaching the oil outlet 26 of the right tail ring 25. These two straight-tube mesh channels constitute a radial oil circuit network, ensuring that the oil flows from the inside of the core to both ends. Simultaneously, multiple middle rings 23 are arranged in an overlapping manner along the axial direction, and their through slots 27 form multiple axial straight slots 211 (axial channels). These axial straight slots 211 are arranged circumferentially and are connected at both ends to the left straight cylindrical mesh channel 29 and the right straight cylindrical mesh channel 210, respectively. This allows the oil to shuttle between the left straight cylindrical mesh channel 29 and the right straight cylindrical mesh channel 210. In this way, the oil forms a three-dimensional flow network inside the stator core 2, covering the entire internal space of the core. During the process of the oil flowing through the bottom arc slot 28, the left straight cylindrical mesh channel 29, the right straight cylindrical mesh channel 210 and the axial straight slots 211, the oil comes into direct contact with the stator core 2 and absorbs the heat generated by the stator winding and the core. Since the oil passage is directly embedded inside the core, the heat is quickly carried away, avoiding the formation of local hot spots and achieving direct and efficient cooling of the heat source core. After absorbing heat, the oil is discharged from the oil outlet holes 26 of the left tail ring 21 and the right tail ring 25 and returns to the external cooling system for circulation cooling. The design of the oil outlet 26 ensures smooth oil flow and prevents oil accumulation. The cooling oil flows through a complex three-dimensional network embedded inside the iron core, directly contacting the stator iron core 2 and the windings, the main heat source. This results in high heat exchange efficiency.

[0073] like Figure 1 As shown, an oil inlet 11 is provided at the bottom of the motor housing 1, and the oil inlet 11 is connected to the oil inlet 212. A liquid tank 12 is located at the bottom of the motor housing 1, directly below the stator core 2, and a drain hole 13 is provided at one end. The motor with direct oil-injection cooling function also includes a connecting pipe (not shown), along which an oil pump (not shown) and a heat exchanger (not shown) are arranged, and both ends of the connecting pipe are connected to the drain hole 13 and the oil inlet 11, respectively. The oil pump and heat exchanger are based on existing technology and will not be described in detail.

[0074] When the motor starts running, the oil pump also starts. The oil pump draws cooled, low-temperature cooling oil from the connecting pipe, pressurizes it, and delivers it through the connecting pipe to the oil inlet 11 at the bottom of the motor housing 1. The pressurized cooling oil enters directly into the oil inlet 212 on the middle ring 23 of the stator core 2, which is connected to it, through the oil inlet 11. The cooling oil enters the annular oil collection groove formed by the bottom arc grooves 28 and through grooves 27 of multiple middle rings 23 through the oil inlet 212 of each middle ring 23. Subsequently, under pressure, the oil is distributed and flows through the three-dimensional internal oil circuit network described earlier. The oil enters the left straight cylindrical mesh channel 29 and the right straight cylindrical mesh channel 210 and flows upward. When the oil flows in these intricate channels, it comes into direct and full contact with the silicon steel sheets of the stator core 2, quickly absorbing the heat generated by the core and windings. Finally, the hot oil, after absorbing heat and increasing in temperature, is sprayed or flows out from the oil outlets 26 of the left tail ring 21 and right tail ring 25, dripping into the internal space of the motor. The hot oil flowing from both ends of the stator core 2 drips downwards under gravity and is collected by the liquid tank 12 located directly below the stator core 2. The hot oil collected in the liquid tank 12 flows through the drain hole 13 at its end, relying on gravity or the slight negative pressure of the system, into the connecting pipe, ready to enter the next processing stage. The hot oil, carrying a large amount of motor heat, flows through the heat exchanger in the connecting pipe. After cooling, the cooling oil is again drawn and pressurized by the oil pump, ready to begin a new round of cooling cycle. After efficiently cooling the inside of the core, the motor's cooling oil is discharged from both ends and sprayed into the internal space of the motor, additionally serving to lubricate key moving parts such as bearings. Good lubrication helps reduce motor operating noise and vibration.

[0075] Second embodiment:

[0076] like Figures 1-12 As shown, the motor with direct cooling oil injection function also includes two inner arc-shaped shells 3, multiple delivery pipes 9, and multiple support rods 4. One side of each inner arc-shaped shell 3 is a first opening, and the two ends of the multiple support rods 4 pass through the first opening and are fixedly connected to the two inner arc-shaped shells 3. Figure 11 As shown, each inner arc-shaped shell 3 has multiple internal injection holes 31 formed on its inner sidewall along its direction. For example... Figure 9As shown, an arc-shaped groove 200 is formed through the stator core 2 along its axial direction. An outer arc-shaped shell 5 is fixed to one side wall of both the left tail ring 21 and the right tail ring 25. The two outer arc-shaped shells 5 are symmetrically connected on both sides of the arc-shaped groove 200. As shown in Figure 8, one side of each outer arc-shaped shell 5 is a second opening, and multiple sets of injection groups 51 are evenly distributed along the axial direction of the stator core 2 on the inner side wall of each outer arc-shaped shell 5. Each injection group 51 includes multiple outer injection holes 510, which are spaced apart along the arc of the outer arc-shaped shell 5. The inner cavities of the two sets of outer arc-shaped shells 5 and the arc-shaped groove 200 form a slide 6. The two ends of multiple delivery pipes 9 are respectively connected to the middle part of the slide 6 and the oil outlet 26, and the multiple delivery pipes 9 correspond one-to-one with the multiple oil outlets 26. Two inner arc-shaped shells 3 are slidably disposed within the slide 6, and any inner arc-shaped shell 3 is connected to a drive mechanism 7 for driving it to slide along the slide 6. When the inner arc-shaped shell 3 slides to a specific position, its inner injection hole 31 can be aligned with the outer injection hole 510 in an injection group 51.

[0077] There are two inner arc-shaped shells 3, which are fixed together by a support rod 4 to form a rigid cooling spray unit (not shown). Each inner arc-shaped shell 3 has an inner spray hole 31 on its inner sidewall. The cooling spray unit can be driven by a drive mechanism 7 to slide within the slide rail 6. Two outer arc-shaped shells 5 are fixed on the left and right sides of the stator core 2 (i.e., on the left tail ring 21 and the right tail ring 25), and their inner sidewalls have multiple sets of outer spray holes 510. The inner cavities of the two outer arc-shaped shells 5 and the arc-shaped grooves 200 on the stator core 2 together form a closed slide rail 6. One end of multiple conveying pipes 9 is connected to the middle area of ​​the slide rail 6, and the other end corresponds one-to-one with the oil outlet holes 26 of the left tail ring 21 and the right tail ring 25. The hot oil flowing out from inside the stator is not sprayed out directly, but is guided into the slide rail 6. The hot oil flowing out from the three-dimensional oil circuit network inside the stator core 2 enters the corresponding conveying pipes 9 through the oil outlet holes 26 of the left tail ring 21 and the right tail ring 25. Hot oil is transported to the middle of the slide rail 6 via the delivery pipe 9. The drive mechanism 7 pushes the sliding unit composed of two inner arc-shaped shells 3. When the inner arc-shaped shell 3 moves to the designated position, its inner injection hole 31 is perfectly aligned with the outer injection hole 510 (i.e., a injection group 51) on a set of outer arc-shaped shells 5. A spray path is formed at the point of hole alignment. It should be noted that the oil exits from the delivery pipe, enters the middle area of ​​the slide rail 6, and further enters the inner cavity of the inner arc-shaped shell 3. The oil is concentrated and sprayed out at high speed from these aligned holes, forming a strong and concentrated oil jet. This oil jet is directly and precisely directed onto the high-temperature stator winding assembly 20, achieving efficient cooling. The concentrated spray greatly improves the heat exchange efficiency at this point, quickly removing heat. The hot oil also drips down and is collected and returned.

[0078] like Figure 6As shown, the drive mechanism 7 is located inside the motor housing 1, and includes a drive gear 71, a driven gear 72, and a connecting rod 74. The drive gear 71 is fixedly mounted on the rotor shaft 14 of the motor. The driven gear 72 is rotatably mounted on the motor housing 1 via a rotating shaft 75 and meshes with the drive gear 71. A support ring 78 is coaxially fixed to the end face of the driven gear 72 via multiple receiving rods 76. A universal joint 790 is eccentrically mounted on the end face of the support ring 78. A guide tube 73 is fixedly connected to any of the outer arc-shaped shells 5. The side wall of the inner arc-shaped shell 3 is slidably connected to the guide tube 73 via a push-pull rod 79. One end of the connecting rod 74 is hinged to the universal joint 790, and the other end of the connecting rod 74 is hinged to the push-pull rod 79. The drive gear 71 is an incomplete gear, configured to drive the driven gear 72 to rotate intermittently. Through the connecting rod 74 and the push-pull rod 79, the two inner arc-shaped shells 3 are driven to intermittently reciprocate within the slide rail 6. During the movement of the two inner arc-shaped shells 3, the spray groups 51 on the two outer arc-shaped shells 5 spray alternately. The drive gear 71 is fixedly mounted on the rotor shaft 14 of the motor. Therefore, as long as the motor starts running, the rotation of the rotor shaft 14 will directly drive the drive gear 71 to rotate.

[0079] The drive gear 71 is designed as an incomplete gear (with only partial teeth). When its toothed portion meshes with the driven gear 72, it drives the driven gear 72 to rotate. When the toothless, smooth portion reaches the meshing position, the driven gear 72 stops rotating. The driven gear 72 is mounted on the motor housing 1 via a shaft 75. A support ring 78 is fixed to its end face via multiple support rods 76. Therefore, the intermittent rotation of the driven gear 72 is directly transmitted to the support ring 78. A universal joint 790 is eccentrically positioned on the end face of the support ring 78. The universal joint 790 is hinged to a push-pull rod 79 via a connecting rod 74. The push-pull rod 79 is connected to the side wall of the inner arc-shaped housing 3 and slides within a guide tube 73. The guide tube 73 is fixed to the outer arc-shaped housing 5, providing guidance and support for the movement of the push-pull rod 79. Since the drive source is intermittent, the movement of the inner arc-shaped housing 3 is also intermittent. As the cooling spray unit slides, it sweeps across the left and right sides of the outer arc-shaped housing 5 in sequence. Therefore, during the sliding process, it should be noted that when the cooling spray unit moves intermittently in one direction, the outer spray groups 51 on the left and right sides alternately align with the inner spray holes 31. To further explain, during the sliding process, the inner arc-shaped shell 3 first aligns with the outer arc-shaped shell 5 spray group 51 on one side (e.g., the left side), generating a concentrated oil jet to powerfully spray and cool the winding on that side. Subsequently, the inner arc-shaped shell 3 continues to slide, the alignment is released, the concentrated spray on that side stops, and it aligns with the spray group 51 on the other side (e.g., the right side), beginning powerful spray cooling of the right winding. This achieves alternating, intermittent concentrated spraying of cooling oil onto the windings at both ends of the motor. Alternating spraying is essentially a type of pulse cooling. When focusing on one side for spraying, all the oil pressure and flow are concentrated on the few aligned spray holes on that side, forming a high-speed, powerful, and penetrating oil jet. This pulsed jet can more effectively break through the oil boundary layer and directly impact the winding surface, greatly enhancing the heat transfer process. Compared to simultaneous but dispersed spraying from both sides, alternating pulse spraying provides significantly higher instantaneous localized cooling intensity, suppressing hot spots more quickly. Simultaneous concentrated spraying from both sides diverts a large amount of cooling oil, causing significant fluctuations or drops in the main oil circuit pressure, potentially resulting in suboptimal flow velocity and impact force at each spray nozzle. Alternating spraying staggers the system's flow demands over time. At any given moment, only one side requires a high flow rate, while the other is in a closed mode. This allows the oil pump to operate under relatively stable and efficient conditions, continuously providing sufficient pressure and flow to the main spray side. Continuous spraying at the same point leads to over-cooling of the surface while internal heat cannot be conducted away, resulting in a large internal-external temperature difference and thermal stress. Alternating spraying ensures that the next cooling cycle removes deeper heat that has already been conducted from the interior to the surface, achieving more thorough, inside-out cooling. This reduces fatigue damage caused by repeated and intense thermal expansion and contraction, extending insulation life.

[0080] like Figure 12 As shown, the motor with direct oil injection cooling function also includes a control unit 8, which includes a lead screw 81 and a moving block 82. A moving groove 780 is formed radially on the end face of the support ring 78. The moving block 82 is slidably embedded in the moving groove 780 and screwed onto the lead screw 81. The lead screw 81 is rotated within the moving groove 780 along its length. A universal joint 790 is provided on the moving block 82, and the free end of the universal joint 790 is hinged to the end of the connecting rod 74 away from the guide tube 73. Before starting the motor, the operator manually adjusts the speed (fast / slow) according to their expectation. The lead screw 81 is rotated using a tool. Since the moving block 82 is connected to the lead screw 81 by a thread and is confined within the moving groove 780, it can only slide and not rotate. Therefore, rotating the lead screw 81 will drive the moving block 82 to move radially (i.e., closer to or further away from the center of the rotating shaft 75) of the support ring 78. The universal joint 790 is mounted on the movable block 82. (It should be noted that one end of the universal joint 790 can be fixedly mounted on the movable block 82, and the other end is a free-turning end, which is hinged to one end of the connecting rod 74. The universal joint can be a cross-shaped universal joint. Further, the universal joint has a two-section structure; one section is fixed to the movable block, and the other section is hinged to the connecting rod.) Therefore, the position of the movable block 82 determines the distance from the universal joint 790 to the rotation center of the support ring 78 (i.e., the rotating shaft 75). When a large stroke is required (i.e., to accommodate a fast rotor), the movable block 82 is adjusted away from the center of the rotating shaft 75 to increase the eccentricity. When a small stroke is required (i.e., to accommodate a slow rotor), the movable block 82 is adjusted closer to the center of the rotating shaft 75 to decrease the eccentricity. For fast rotors, the rotor speed is high, and the frequency of driving the inner arc-shaped shell 3 to move is high. At this point, setting a large sliding stroke ensures that a single slide of the inner arc-shaped shell 3 can cover a wider arc-shaped area under high-speed scanning. This achieves efficient and rapid scanning cooling of the motor end under the dual guarantee of high frequency and large range, avoiding uneven cooling caused by insufficient amplitude despite high scanning frequency. For slow-speed rotors, the rotor speed is low, and the frequency of driving the inner arc-shaped shell 3 is low. A small sliding stroke is preset, and the drive gear 71 is designed as an incomplete gear (with only partial teeth). When its toothed part meshes with the driven gear 72, it pushes the driven gear 72 to rotate. This compensates for the round-trip time of the cooling spray unit gap. This results in intermittent, small-range sliding. The small sliding stroke compensates for the low operating frequency, allowing the system to periodically and repeatedly dissipate heat from the critical hot area stator winding assembly 20, achieving economical and efficient cooling under low power consumption conditions. This further improves the flow velocity of the three-dimensional flow network.

[0081] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A motor having an oil injection direct cooling function, comprising a motor case, characterized in that, Also included is a stator core fixed in the motor shell; The stator core includes a left tail ring, a plurality of left rings, a plurality of middle rings, a plurality of right rings and a right tail ring coaxially connected in sequence from left to right, the left tail ring and the right tail ring are both provided with a plurality of oil outlet holes; The left ring, the middle ring and the right ring are both provided with a bottom arc groove and a plurality of through grooves along the axial direction; The bottom arc groove and a plurality of the through grooves are circumferentially arranged on the left ring, the middle ring and the right ring; A plurality of the bottom arc grooves are interconnected, two adjacent left rings are arranged in a staggered manner, and the through grooves of the two left rings are connected, so that the through grooves of a plurality of the left rings are connected to form a left straight cylinder network channel, one end of the left straight cylinder network channel close to the left tail ring is connected with the oil outlet hole of the left tail ring, and the other end close to the bottom arc groove is connected with a plurality of the bottom arc grooves; Two adjacent right rings are arranged in a staggered manner, and the through grooves of the two right rings are connected, so that the through grooves of a plurality of the right rings form a right straight cylinder network channel, one end of the right straight cylinder network channel close to the right tail ring is connected with the oil outlet hole of the right tail ring, and the other end close to the bottom arc groove is connected with a plurality of the bottom arc grooves; A plurality of the middle rings are arranged in an axial overlap manner, so that a plurality of through grooves form a plurality of axial straight grooves; A plurality of the axial straight grooves are circumferentially arranged on a plurality of the middle rings, and both ends are respectively connected with the right straight cylinder network channel and the left straight cylinder network channel; An oil inlet is formed on the outer ring wall of each middle ring, and the oil inlet is connected with the bottom arc groove; the inner diameters of the left tail ring, a plurality of the left rings, a plurality of the middle rings, a plurality of the right rings and the right tail ring are consistent, and the outer diameters of the five are consistent; The left straight cylinder network channel, the right straight cylinder network channel, the bottom arc groove and the axial straight groove jointly constitute a three-dimensional oil channel network covering the inside of the stator core.

2. The motor with oil injection direct cooling function according to claim 1, characterized in that, A plurality of limiting grooves are circumferentially formed on the positions close to the inner circles of the left tail ring, a plurality of the left rings, a plurality of the middle rings, a plurality of the right rings and the right tail ring, a plurality of the limiting grooves form a plurality of strip grooves for winding metal coils, and a plurality of the strip grooves are circumferentially arranged on the stator core.

3. The motor with oil injection direct cooling function according to claim 1, characterized in that, The number of the left tail ring and the right tail ring is at least one; The left tail ring, a plurality of the left rings, a plurality of the middle rings, a plurality of the right rings and the right tail ring are coaxially welded in sequence from left to right.

4. The motor with oil injection direct cooling function according to claim 1, characterized in that, An oil inlet hole is formed at the bottom end of the motor shell, and the oil inlet hole is connected with the oil inlet; The bottom end of the motor shell has a liquid tank body, the liquid tank body is located directly below the stator core, and one end is provided with a leakage hole; The motor with oil injection direct cooling function further includes a connecting pipe, the connecting pipe is arranged with an oil pump and a heat exchanger, and both ends are respectively connected with the leakage hole and the oil inlet hole.

5. The motor with oil injection direct cooling function according to claim 4, characterized in that, It also includes two inner arc shells, a plurality of conveying pipes and a plurality of supporting rods; One side of each inner arc shell is a first open, and both ends of a plurality of supporting rods are fixedly connected with two inner arc shells through the first open; A plurality of inner injection holes are formed on the inner side wall of each inner arc shell along the direction thereof; The stator core is provided with arc-shaped slots along the axial direction, and the side walls of the left and right tail rings are fixedly provided with outer arc-shaped shells which are symmetrically arranged on both sides of the arc-shaped slots; Each of the outer arc-shaped shells is provided with a second opening on one side, and a plurality of groups of spray groups are arranged on the inner side wall along the axial direction of the stator core; Each group of spray groups comprises a plurality of outer spray holes which are arranged at intervals along the arc of the outer arc-shaped shell; The inner cavities of the two outer arc-shaped shells and the arc-shaped slots form a slide channel; The two ends of the plurality of conveying pipes are respectively connected to the slide channel near the middle part and the oil outlet holes, and correspond to the plurality of oil outlet holes one by one; The two inner arc-shaped shells are slidably arranged in the slide channel, and any of the inner arc-shaped shells is connected to a driving mechanism for driving it to slide along the slide channel; When the inner arc-shaped shell slides to a specific position, the inner spray hole on the inner arc-shaped shell can be aligned with the outer spray hole in the spray group.

6. The motor with oil injection direct cooling function according to claim 5, characterized in that, The driving mechanism is located in the motor shell and comprises a driving gear, a driven gear and a connecting rod; The driving gear is fixedly sleeved on the rotor shaft of the motor; The driven gear is rotatably arranged on the motor shell through a rotating shaft and is engaged with the driving gear; The end surface of the driven gear is coaxially fixedly provided with a support ring through a plurality of receiving rods; An eccentric universal shaft is arranged on the end surface of the support ring; Any of the outer arc-shaped shells is fixedly and communicatively provided with a guide pipe; The side wall of the inner arc-shaped shell is slidably connected with the guide pipe through a push-pull rod; One end of the connecting rod is hingedly connected with the universal shaft, and the other end is hingedly connected with the push-pull rod.

7. The motor with oil injection direct cooling function according to claim 6, characterized in that, The driving gear is an incomplete gear configured to drive the driven gear to rotate intermittently; Through the connecting rod and the push-pull rod, the two inner arc-shaped shells are driven to intermittently reciprocate in the slide channel; During the movement of the two inner arc-shaped shells, the spray groups on the two outer arc-shaped shells are alternately sprayed.

8. The motor with oil injection direct cooling function according to claim 7, characterized in that, Further comprising a control unit, the control unit comprising a lead screw and a moving block; The end surface of the support ring is provided with a moving groove along the radial direction, and the moving block is slidably embedded in the moving groove and is screwed onto the lead screw, and the lead screw is arranged in the moving groove along the length direction of the moving groove; The moving block is provided with the universal shaft, and the free end of the universal shaft is hingedly connected with one end of the connecting rod away from the guide pipe.

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