Rotor cooling structure and oil-cooled motor

Abstract

The utility model provides a rotor cooling structure and an oil-cooled motor, belonging to the technical field of motors, comprising: a rotating shaft, a rotor, a rotor core pressure ring and an oil spray ring, wherein the rotating shaft is provided with a cooling oil passage; the rotor comprises a rotor core and a magnetic steel arranged on the rotor core; the rotor core pressure ring is sleeved on the rotating shaft and arranged at both ends of the rotor core; a pressure ring oil passage communicating with the cooling oil passage is arranged on the rotor core pressure ring; the oil spray ring is arranged on the outer side of the rotor core pressure ring; the oil spray ring is connected to the rotor core pressure ring through a branch oil pipe; the oil spray ring has a circumferential oil passage, which is connected with the pressure ring oil passage through a branch oil pipe, and an axial oil spray hole communicating with the circumferential oil passage is also arranged on the oil spray ring, and the axial oil spray hole faces the end face of the rotor core, so that the cooling oil is directly sprayed to the rotor core and the magnetic steel. The magnetic steel and the rotor core are directly in contact with the cooling oil, which can greatly improve the cooling effect of the magnetic steel and the rotor core.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a rotor cooling structure and an oil-cooled motor. Background Art

[0002] As the global oil resource crisis and environmental pollution become increasingly prominent, new energy vehicles are gradually being widely used because their energy utilization efficiency is much higher than that of ordinary gasoline vehicles. Due to the limited installation space of electric vehicles, the motors used must have high power density and efficiency. In addition, the complex road conditions and driving habits make the motor operating conditions very complicated and the temperature rise is serious. If the motor temperature rise or local temperature rise is too high, it will not only cause structural deformation, but also cause demagnetization of the magnetic steel inside the motor, seriously affecting its service life.

[0003] The current water cooling method for motors is to simply set up water channels on the motor housing to allow coolant to flow in. The heat source inside the motor needs to be transferred to the outside through layers of structures, and then carried away by the water channels, indirectly taking away the heat inside the motor. However, there is an air gap between the stator armature and the rotor assembly. Because of the thermal resistance, there is a temperature gradient, so the magnetic steel cannot be directly cooled, resulting in temperature accumulation and the formation of local hot spots. Therefore, this water cooling effect that indirectly takes away the heat inside the motor is not ideal for cooling the magnetic steel.

[0004] The current oil-cooled motor uses an oil spray pipe to carry out directional and fixed-point spray cooling on the outer ring of the winding, and the inner ring of the winding is only cooled by oil throwing on a balance plate connected to the rotating shaft. When the rotor is running, the cooling oil is dispersed due to the action of centrifugal force, and it cannot achieve directional and fixed-point cooling. The cooling effect of the inner ring of the winding is general. In addition, although oil flows through the inside of the rotor, it cannot directly reach the heating part of the magnetic steel, and cannot effectively reduce the temperature of the magnetic steel, and the cooling effect on the magnetic steel is not ideal.

[0005] The current motor oil cooling method: The oil-cooled motor relies solely on the balance plate connected to the shaft for oil throwing cooling. When the rotor is running, the cooling oil is dispersed due to the action of centrifugal force, and the cooling effect of the inner ring of the winding is general. Moreover, although the oil flows through the inside of the rotor, it cannot directly reach the heating part of the magnetic steel, and cannot directly and effectively reduce the temperature of the magnetic steel, and the cooling effect on the magnetic steel is not ideal. Utility Model Content

[0006] The embodiments of the utility model provide a rotor cooling structure and an oil-cooled motor, aiming to solve the problem that the current cooling method of the motor cannot directly and effectively reduce the temperature of the magnetic steel, the cooling effect is poor, and the magnetic steel inside the motor will be demagnetized, thereby affecting the service life of the magnetic steel and reducing the working efficiency of the motor.

[0007] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a rotor cooling structure, including:

[0008] The rotating shaft is provided with a cooling oil passage;

[0009] A rotor, mounted on the rotating shaft, comprising a rotor core and a magnetic steel embedded in the rotor core;

[0010] A rotor core pressure ring is sleeved on the rotating shaft and arranged at both ends of the rotor core; the rotor core pressure ring is provided with a pressure ring oil channel connected to the cooling oil channel; and

[0011] An oil spray ring is arranged on the outer side of the rotor core pressure ring; the oil spray ring is connected to the rotor core pressure ring through a branch oil pipe; the oil spray ring has a circumferential oil passage, and the circumferential oil passage is connected to the pressure ring oil passage through the branch oil pipe. The oil spray ring is also provided with an axial oil spray hole connected to the circumferential oil passage, and the axial oil spray hole faces the end face of the rotor core so that the cooling oil can be directly sprayed onto the rotor core and the magnetic steel.

[0012] In combination with the first aspect, in a feasible manner, it also includes an oil-passing bolt, a mounting seat is provided on the branch oil pipe, and the oil-passing bolt is connected to the rotor core pressure ring through the mounting seat; the oil-passing bolt has a first flow channel connected to the pressure ring oil channel and a second flow channel connected to the branch oil pipe, and the second flow channel is connected to the first flow channel.

[0013] In combination with the first aspect, in one achievable manner, the first flow channel is axially connected, one end of the first flow channel is connected to the pressure ring oil channel, and the other end faces the bearing mounted on the rotating shaft, so that part of the cooling oil is directly sprayed onto the bearing.

[0014] In combination with the first aspect, in an achievable manner, it also includes a stator winding arranged on the outer periphery of the rotor core, and the oil injection ring is also provided with radial oil injection holes connected to the circumferential oil channel, and the radial oil injection holes are facing the stator winding so that the cooling oil can be directly sprayed onto the stator winding.

[0015] In combination with the first aspect, in one achievable manner, a plurality of the radial oil injection holes and the axial oil injection holes are evenly arranged along the circumferential direction on the oil injection ring, and the radial oil injection holes are staggered with the axial oil injection holes.

[0016] In combination with the first aspect, in one achievable manner, the oil injection ring includes two semicircular oil pipes, and the two semicircular oil pipes are connected by a connecting piece.

[0017] In combination with the first aspect, in one achievable manner, the cooling oil passage includes an axial oil passage and a radial oil passage which are arranged on the rotating shaft, and the radial oil passage is connected to the axial oil passage; the radial oil passage is connected to the pressure ring oil passage.

[0018] In combination with the first aspect, in one achievable manner, the rotor core pressure ring is connected to the rotating shaft via a key, and the pressure ring oil passage is arranged along the radial direction of the rotating shaft.

[0019] In combination with the first aspect, in one achievable manner, bearings are installed at both ends of the rotating shaft, and the oil spray ring is provided with bearing oil spray holes for spraying oil toward the bearings.

[0020] Compared with the prior art, the rotor cooling structure provided by the utility model has the following beneficial effects: (1) the cooling oil enters the circumferential oil channel of the oil spray ring through the cooling oil channel on the rotating shaft, the pressure ring oil channel on the rotor core pressure ring, and the branch oil pipe, and is directly sprayed onto the end faces of the rotor core and the magnet from the axial oil spray hole on the oil spray ring, so that the magnet and the rotor core are in direct contact with the cooling oil. This can greatly improve the cooling effect of the magnet and the rotor core, avoid the occurrence of magnet demagnetization caused by high temperature, increase the service life of the magnet, increase the torque and power density of the motor, and thus improve the working efficiency of the motor; (2) the rotor core pressure ring integrates the function of the balance plate, which has the function of axial limiting the rotor core and can also perform weight-removing dynamic balancing on it, replacing the traditional balance plate and pressure ring structure, reducing the use of parts and simplifying the structure of the motor.

[0021] In a second aspect, an embodiment of the utility model further provides an oil-cooled motor, comprising the rotor cooling structure.

[0022] The oil-cooled motor provided by the embodiment of the utility model can directly cool the rotor core and the magnetic steel with the cooling oil, thereby greatly improving the cooling effect and working efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the cross-sectional structure of the rotor cooling structure provided in the embodiment of the utility model Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of the rotor cooling structure provided by the embodiment of the utility model spraying cooling oil to the inner ring of the stator winding;

[0025] Figure 3 A schematic cross-sectional view of a rotor cooling structure provided by an embodiment of the utility model ( Figure 2 The section is perpendicular to Figure 1 )

[0026] Figure 4 A schematic diagram of the structure of the cooling oil provided in the embodiment of the utility model spraying oil directly onto the magnetic steel and the rotor core;

[0027] Figure 5 A schematic diagram of the three-dimensional structure of the rotor cooling structure provided by an embodiment of the utility model;

[0028] Figure 6 A schematic diagram of the three-dimensional structure of a rotor core pressure ring provided in an embodiment of the utility model;

[0029] Figure 7 A schematic cross-sectional structure diagram of a rotor core pressure ring provided in an embodiment of the utility model;

[0030] Figure 8 A schematic diagram of the three-dimensional structure of the fuel injection ring provided in the embodiment of the utility model;

[0031] Fig. 9 A schematic diagram of the cross-sectional structure of the fuel injection ring provided in the embodiment of the utility model;

[0032] Fig.10 For along Fig. 9 The cross-sectional structure diagram along the AA line;

[0033] Fig.11 A schematic diagram of the three-dimensional structure of the oil-through bolt provided in the embodiment of the utility model;

[0034] Fig.12 A schematic diagram of the cross-sectional structure of an oil-through bolt provided in an embodiment of the utility model;

[0035] Fig.13 A schematic diagram of the cross-sectional structure of the rotor cooling structure provided in the embodiment of the utility model Figure 2 ;

[0036] Description of reference numerals:

[0037] 1. Stator winding; 2. Rotor core; 3. Oil injection ring; 301. Mounting hole; 302. Branch oil pipe; 303. Circumferential flow channel; 304. Radial oil injection hole; 305. Axial oil injection hole; 306. Connector; 307. Mounting seat; 308. Bearing oil injection hole; 4. Oil through bolt; 401. First flow channel; 402. Second flow channel; 5. Rotor core pressure ring; 501. Positioning key; 502. Pressure ring oil channel; 503. Threaded hole; 6. Bearing; 7. Rotating shaft; 701. Radial oil channel; 702. Axial oil channel; 8. Magnetic steel. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0040] In the claims, specification and the above-mentioned drawings of the utility model, the term "axial" refers to the direction along the central axis of the rotating shaft, "radial" refers to the direction along the diameter of the rotating shaft, and "circumferential" refers to the circumferential direction with the center of the rotating shaft as the center. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so they cannot be understood as limiting the specific protection scope of the present invention.

[0041] Please also read Figure 1 and Figure 2 The rotor cooling structure provided by the utility model is now described. The rotor cooling structure comprises: a rotating shaft 7, a rotor, a rotor core pressure ring 5 and an oil injection ring 3, wherein the rotating shaft 7 is provided with a cooling oil passage; the rotor is mounted on the rotating shaft 7, and the rotor comprises a rotor core and a magnetic steel 8 embedded in the rotor core 2; the rotor core pressure ring 5 is sleeved on the rotating shaft 7 and arranged at both ends of the rotor core 2; a pressure ring oil passage 502 communicating with the cooling oil passage is arranged on the rotor core pressure ring 5; the oil injection ring 3 is arranged on the outer side of the rotor core pressure ring 5; the oil injection ring 3 is connected to the rotor core pressure ring 5 through a branch oil pipe 302; the oil injection ring 3 has a circumferential oil passage, which is connected to the pressure ring oil passage 502 through the branch oil pipe 302, and an axial oil injection hole 305 communicating with the circumferential oil passage is also arranged on the oil injection ring 3, and the axial oil injection hole 305 faces the end face of the rotor core 2, so that the cooling oil is directly sprayed to the rotor core 2 and the magnetic steel 8.

[0042] The magnetic steel 8 in the motor has the functions of generating magnetic field, improving motor efficiency and enhancing motor performance. The following is an explanation of the functions of the magnetic steel 8: First, generate magnetic field: the magnetic steel 8 in the motor is composed of permanent magnets or electromagnetic coils. By applying current in the electromagnetic coils, a magnetic field is generated, thereby forming corresponding magnetic poles. This forms a magnetic field between the stator and the rotor of the motor, so that an attraction or repulsion force is generated between them, driving the motor to rotate; second, improve the efficiency of the motor: the role of the magnetic steel 8 in the motor is similar to that of a permanent magnet. They can maintain magnetic force for a long time after being acted upon by current; when the motor starts, the magnetic energy in the magnetic steel 8 is converted into mechanical energy, which improves the rotation efficiency of the motor, reduces motor losses and improves motor efficiency; third, enhance motor performance: the performance of the motor includes output power, torque, efficiency and other aspects, and the role of the magnetic steel 8 is crucial. For example, the use of high-grade magnetic steel 8 in the motor can increase the output power of the motor, making it suitable for various large-capacity applications. In addition, the different types and parameters of the magnetic steel 8 can also affect the motor's speed, starting torque and load characteristics.

[0043] It can be seen that the role of the magnetic steel 8 in the motor is irreplaceable. They can help the motor start, improve efficiency, enhance performance, and make the motor suitable for a wider range of application scenarios. However, if the motor temperature rise or local temperature rise is too high, it will have a great impact on the magnetic steel 8 inside the motor, causing the magnetic steel 8 to demagnetize, seriously affecting the performance and service life of the magnetic steel 8, thereby affecting the efficiency and working performance of the motor.

[0044] The rotor cooling structure provided by the utility model solves the first problem of poor cooling effect of indirect cooling of the magnetic steel 8. Compared with the current indirect cooling method of the magnetic steel 8, the present application adopts a direct cooling method in which the oil spray ring 3 connected to the cooling oil channel directly sprays cooling oil to the magnetic steel 8 and the rotor core 2, which can greatly improve the cooling and cooling effect of the magnetic steel 8 and the rotor core 2, avoid the occurrence of demagnetization of the magnetic steel 8 caused by high temperature, increase the service life of the magnetic steel 8, increase the torque and power density of the motor, and thus improve the working efficiency of the motor; the cooling route of the cooling oil is as follows: the cooling oil enters the circumferential oil channel of the oil spray ring 3 through the cooling oil channel on the rotating shaft 7, the pressure ring oil channel 502 on the rotor core pressure ring 5, and the branch oil pipe 302, and is sprayed from the axial oil spray hole 305 on the oil spray ring 3 to the end faces of the rotor core 2 and the magnetic steel 8, so that the magnetic steel 8 and the rotor core 2 are directly in contact with the cooling oil.

[0045] The motor of new energy vehicles is a synchronous motor that uses permanent magnets as the excitation source. It has the advantages of high efficiency, high power density, and fast response speed. In practical applications, it is very important to perform weight removal balancing. Weight removal balancing is a technology that achieves a balanced state by removing excess mass from rotating parts. This technology is mainly used in fields that require high-precision balancing, such as aerospace and automobile engines. The principle of weight removal balancing is to detect the unbalanced point of the rotating part on the dynamic balancing machine, and then use ultrafast laser energy to irradiate the unbalanced point to vaporize it, thereby quickly and accurately removing the excess mass.

[0046] The rotor core pressure ring 5 of the present application integrates the function of the balancing plate. The rotor core pressure ring 5 not only has the function of axially limiting the rotor core 2, but also can perform weight-removing dynamic balancing thereon, replacing the traditional balancing plate and pressure ring structure, reducing the use of components and simplifying the structure of the motor.

[0047] The rotor cooling structure provided by the utility model further includes an oil-through bolt 4, a mounting seat 307 is provided on the branch oil pipe 302, and the oil-through bolt 4 is connected to the rotor core pressure ring 5 through the mounting seat 307; the oil-through bolt 4 has a first flow channel 401 connected to the pressure ring oil channel 502 and a second flow channel 402 connected to the branch oil pipe 302, and the second flow channel 402 is connected to the first flow channel 401. The present application uses the oil-through bolt 4 to fix the injection ring 3 on the rotor core pressure ring 5, and the oil-through bolt 4 not only has the function of connection, but also has the function of connecting the injection ring 3 with the pressure ring oil channel 502.

[0048] The assembly sequence of the present application is as follows: the first step is to press the rotor core pressure ring 5 at the rear end into the corresponding position of the shaft 7; the second step is to press the rotor core 2 with the built-in magnetic steel 8 into the shaft 7 and close to the rotor core pressure ring 5; the third step is to press the rotor core pressure ring 5 at the front end into the shaft 7 and close to the rotor core 2; the fourth step is to complete the rotor weight removal dynamic balancing process; the fifth step is to use the oil-through bolt 4 to install the oil injection ring 3 on the rotor core pressure ring 5 at the front and rear ends; the sixth step is to press the bearing 6 into the corresponding positions at both ends of the shaft 7.

[0049] The cooling structure provided in the present application has the following oil path directions for cooling the magnet 8 and the rotor core: the cooling oil is directly sprayed toward the magnet 8 and the rotor core 2 through the cooling oil channel inside the rotating shaft 7, the pressure ring oil channel 502, the first flow channel 401, the second flow channel 402, the branch oil pipe 302, the circumferential flow channel 303, and the axial oil injection hole 305. The cooling oil can be directly sprayed toward the magnet 8 and the rotor core 2 through the axial oil injection hole 305, so that the cooling oil directly contacts the magnet 8 and the rotor core 2, thereby greatly improving the cooling effect of the magnet 8 and the rotor core 2.

[0050] At present, the rotating shaft 7 needs to be processed with an inclined oil hole to lubricate the bearing 6. The rotating shaft 7 is large in size and weight. The processing of the inclined hole requires a special fixture and is not easy to position. The processing is difficult and the processing cost is high. Therefore, the second problem solved by this application is the high processing cost of the rotating shaft 7. The technical solution adopted by this application is to directly borrow the first flow channel 401 on the oil-passing bolt 4 to directly spray oil to the bearing 6. The specific solution is as follows:

[0051] The first flow channel 401 on the oil-through bolt 4 is axially connected, one end of the first flow channel 401 is connected to the pressure ring oil channel 502, and the other end faces the bearing 6 mounted on the rotating shaft 7, so that part of the cooling oil is directly sprayed to the bearing 6. Therefore, the oil-through bolt 4 takes into account both the cooling and lubrication of the bearing 6. At this time, there is no need to process the oblique oil hole on the rotating shaft 7. The cooling oil channel on the rotating shaft 7 can be processed into a radial oil channel 701 and an axial oil channel 702 according to a simple processing method, which effectively reduces the processing cost of the rotating shaft 7.

[0052] The oil path for cooling and lubricating the bearing 6 is as follows: the cooling oil is directly sprayed toward the bearing 6 through the cooling oil channel inside the rotating shaft 7 , the pressure ring oil channel 502 and the first flow channel 401 , thereby achieving cooling and lubrication of the bearing 6 .

[0053] The current installation order of the rotor core, stator core and stator winding is that the rotor core 2 is sleeved in the stator core, and the stator winding 1 is arranged in the stator slot of the stator core. For the cooling of the stator winding 1, the current oil-cooled motor uses an oil spray pipe to spray and cool the outer ring of the stator winding 1 in a directional and fixed-point manner, while the inner ring of the stator winding 1 is only cooled by the balance plate connected to the rotating shaft 7. When the rotor is running, the cooling oil is dispersed due to the centrifugal force, and the directional and fixed-point cooling cannot be achieved. The cooling effect of the inner ring of the stator winding 1 is not ideal. Therefore, the third problem solved by this application is the problem of poor cooling effect of the inner ring of the stator winding 1.

[0054] In order to solve the problem of poor cooling effect of the stator winding 1, the present application adopts a radial oil injection hole 304 connected to the circumferential oil channel provided on the oil injection ring 3, and the radial oil injection hole 304 faces the stator winding 1 so that the cooling oil can be directly sprayed to the stator winding 1.

[0055] The oil path for cooling the inner ring of the stator winding 1 is as follows: the cooling oil reaches the radial oil injection hole 304 through the cooling oil channel inside the rotating shaft 7, the pressure ring oil channel 502 of the rotor core pressure ring 5, the first flow channel 401, the second flow channel 402, the branch oil pipe 302, and the circumferential flow channel 303, and is directly sprayed from the radial oil injection hole 304 to the inner rings at both ends of the stator winding 1, so that the cooling oil coming out of the rotating shaft 7 cools the inner ring winding of the stator winding 1 in a targeted and fixed manner, thereby improving the cooling effect of the inner ring of the stator winding 1.

[0056] In some embodiments, a plurality of radial oil injection holes 304 and axial oil injection holes 305 are evenly arranged along the circumferential direction on the oil injection ring 3, and the radial oil injection holes 304 and the axial oil injection holes 305 are staggered. The staggered arrangement of the radial oil injection holes 304 and the axial oil injection holes 305 can avoid the problem of poor strength of the oil injection ring 3 caused by the oil injection holes in two directions being too close to each other on the same cross section of the oil injection ring 3; the radial oil injection holes 304 and the axial oil injection holes 305 are evenly arranged to form uniform oil injection on the rotor core 2, the magnetic steel 8 and the stator winding 1, thereby improving the uniformity of cooling and thus improving the cooling effect.

[0057] In some embodiments, the oil injection ring 3 includes two semicircular oil pipes, which are connected by a connector 306 .

[0058] The fuel injection ring 3 of the present application uses a connector 306 to connect two identical semicircular oil pipes. Compared with the full-circular fuel injection ring 3, the manufacturing process is simpler and the manufacturing cost is reduced. Two branch oil pipes 302 can be symmetrically arranged, which are mainly connected to the cooling oil channel of the rotating shaft 7. The branch oil pipe 302 can be welded or screwed to the fuel injection ring 3. The mounting seat 307 can be welded or screwed to the branch oil pipe 302. The mounting seat 307 is designed with a mounting hole 301. The oil-passing bolt 4 passes through the mounting hole 301, and its end reaches the threaded hole 503 on the rotor core pressure ring 5. The fuel injection ring 3 is fixedly connected to the rotor core pressure ring 5 by a threaded connection. The connection between the two identical semicircular oil pipes and the connector 306 can be welding, riveting, screwing, or any other form of connection.

[0059] In some embodiments, the cooling oil passage includes an axial oil passage 702 and a radial oil passage 701 provided on the rotating shaft 7, wherein the radial oil passage 701 is connected to the axial oil passage 702; and the radial oil passage 701 is connected to the pressure ring oil passage 502. Since the first flow passage 401 of the oil-passing bolt 4 can directly spray oil to the bearing 6 to achieve cooling and lubrication of the bearing 6, it is not necessary to process the oblique oil hole which is difficult to process on the rotating shaft 7, and it is sufficient to process the axial and radial oil passages, which is simple and convenient to process and reduces the processing cost.

[0060] The cooling oil enters the pressure ring oil channel 502 on the rotor core pressure ring 5 through the axial oil channel 702 and the radial oil channel 701, and then enters the first flow channel 401, and can be directly sprayed to the bearing 6, enters the branch oil pipe 302 through the second flow channel 402, and enters the circumferential oil channel of the injection ring 3 through the branch oil pipe 302, and then is directly sprayed from the axial injection hole 305 to the rotor core 2 and the magnetic steel 8, and is directly sprayed from the radial injection hole 304 to the inner ring of the stator winding 1, thereby realizing direct cooling of the bearing 6, the rotor core 2, the magnetic steel 8 and the stator winding 1 by the cooling oil, while improving the cooling effect of each part, and improving the cooling effect of the motor as a whole, avoiding high-temperature deformation of the motor structure, and improving the service life and performance of the motor.

[0061] In some embodiments, the rotor core pressing ring 5 is connected to the rotating shaft 7 by a key, and the pressing ring oil passage 502 is arranged along the radial direction of the rotating shaft 7. The inner ring of the rotor core pressing ring 5 is provided with a positioning key 501, and the corresponding rotating shaft 7 is provided with a positioning groove, and the cooperation of the two can realize the positioning of the rotor core pressing ring 5.

[0062] The three technical problems raised in this application can all be achieved without using the oil-through bolt 4. Specifically, for the first problem, direct cooling of the magnet 8 can be achieved through the axial oil injection hole 305 on the oil injection ring 3; for the third problem, direct cooling of the inner ring of the stator winding 1 can be achieved through the radial oil injection hole 304 on the oil injection ring 3; for the second problem, cooling and lubrication of the bearing 6, a bearing oil injection hole 308 for spraying oil toward the bearing 6 can be provided on the oil injection ring 3, so as to achieve oil injection to the bearing 6.

[0063] The specific implementation is as follows: the mounting base 307 of the fuel injection pipe is not needed, the oil through bolt 4 is not needed, the fuel injection pipe branch oil pipe 302 is axially bent so that its axial direction is perpendicular to the rotor core 2, the threaded hole 503 on the rotor core pressure ring 5 can be changed to a smooth hole, and the branch oil pipe 302 is installed by interference fit in the smooth hole.

[0064] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0065] Based on the same inventive concept, an embodiment of the present application also provides an oil-cooled motor, including the rotor cooling structure.

[0066] In the oil-cooled motor provided by the embodiment of the utility model, the cooling oil can directly cool the rotor core 2 and the magnetic steel 8, which greatly improves the cooling effect and working efficiency of the motor.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor cooling structure, characterized in that: include: The rotating shaft (7) is provided with a cooling oil channel; A rotor, mounted on the rotating shaft (7), comprising a rotor core (2) and a magnetic steel (8) embedded in the rotor core (2); A rotor core pressure ring (5) is sleeved on the rotating shaft (7) and arranged at both ends of the rotor core (2); the rotor core pressure ring (5) is provided with a pressure ring oil passage (502) connected to the cooling oil passage; and An oil spray ring (3) is arranged on the outer side of the rotor core pressure ring (5); the oil spray ring (3) is connected to the rotor core pressure ring (5) through a branch oil pipe (302); the oil spray ring (3) has a circumferential oil passage, the circumferential oil passage is connected to the pressure ring oil passage (502) through the branch oil pipe (302), and the oil spray ring (3) is also provided with an axial oil spray hole (305) connected to the circumferential oil passage, the axial oil spray hole (305) is facing the end face of the rotor core (2), so that the cooling oil is directly sprayed onto the rotor core (2) and the magnetic steel (8).

2. The rotor cooling structure according to claim 1, characterized in that: It also includes an oil-through bolt (4), a mounting seat (307) is provided on the branch oil pipe (302), and the oil-through bolt (4) is connected to the rotor core pressure ring (5) through the mounting seat (307); the oil-through bolt (4) has a first flow channel (401) connected to the pressure ring oil channel (502) and a second flow channel (402) connected to the branch oil pipe (302), and the second flow channel (402) is connected to the first flow channel (401).

3. The rotor cooling structure according to claim 2, characterized in that: The first flow channel (401) is axially connected, one end of the first flow channel (401) is connected to the pressure ring oil channel (502), and the other end faces the bearing (6) installed on the rotating shaft (7), so that part of the cooling oil is directly sprayed onto the bearing (6).

4. The rotor cooling structure according to any one of claims 1 to 3, characterized in that: It also includes a stator winding (1) arranged on the outer periphery of the rotor core (2), and the oil injection ring (3) is also provided with radial oil injection holes (304) connected to the circumferential oil channel, and the radial oil injection holes (304) are oriented toward the stator winding (1) so that cooling oil can be directly sprayed toward the stator winding (1).

5. The rotor cooling structure according to claim 4, characterized in that: A plurality of radial oil injection holes (304) and axial oil injection holes (305) are evenly arranged along the circumferential direction on the oil injection ring (3), and the radial oil injection holes (304) and the axial oil injection holes (305) are staggered.

6. The rotor cooling structure according to claim 1, characterized in that: The oil injection ring (3) comprises two semicircular oil pipes, and the two semicircular oil pipes are connected via a connecting piece (306).

7. The rotor cooling structure according to claim 1, characterized in that: The cooling oil passage comprises an axial oil passage (702) and a radial oil passage (701) arranged on the rotating shaft (7); the radial oil passage (701) is connected to the axial oil passage (702); and the radial oil passage (701) is connected to the pressure ring oil passage (502).

8. The rotor cooling structure according to claim 1, characterized in that: The rotor core pressure ring (5) is connected to the rotating shaft (7) via a key, and the pressure ring oil passage (502) is arranged along the radial direction of the rotating shaft (7).

9. The rotor cooling structure according to claim 1, characterized in that: Bearings (6) are installed at both ends of the rotating shaft (7), and the oil injection ring (3) is provided with bearing oil injection holes (308) for injecting oil toward the bearings (6).

10. An oil-cooled motor, characterized in that: It comprises a rotor cooling structure as described in any one of claims 1 to 9.

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