Motor rotor assembly, motor, and electric vehicle

Abstract

A motor rotor assembly (100), a motor, and an electric vehicle. The motor rotor assembly comprises a rotating shaft (1), a core (2), magnets (30), and balance plates (4). The rotating shaft is provided with a first oil inlet hole (11) and a second oil inlet hole (12). The core is connected to the rotating shaft, and the core is provided with a first channel (21) and a second channel (22). The balance plates include a first balance plate (41) and a second balance plate (42) which are arranged at two axial ends of the core, and each balance plate is provided with an oil passage (400). An oil inlet end of the first channel is communicated with the first oil inlet hole by means of the oil passage on the first balance plate, and an oil outlet end of the first channel is communicated with the oil passage on the second balance plate. An oil inlet end of the second channel is communicated with the second oil inlet hole by means of the oil passage on the second balance plate, and an oil outlet end of the second channel is communicated with the oil passage on the first balance plate.

Description

Motor rotor assembly, motor and electric vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on the Chinese patent application with application number 202311598382.8 and application date of November 27, 2023, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of oil cooling technology, but is not limited to it, and in particular to a motor rotor assembly, a motor, and an electric vehicle. Background Art

[0004] The drive motors of existing new energy vehicles generally use oil cooling, which is divided into a cooling system for the rotor and a cooling system for the stator, of which the cooling system for the stator is more common.

[0005] However, insufficient attention is paid to cooling the rotor core within the cooling system, resulting in low cooling efficiency and impacting motor assembly efficiency. The rotor cooling system also rarely considers the symmetrical distribution of coolant, leading to uneven cooling and large temperature differences across the rotor.

[0006] Therefore, there is room for improvement in the cooling system of the motor rotor. Summary of the Invention

[0007] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0008] According to an embodiment of the first aspect of the present disclosure, a motor rotor assembly includes a rotating shaft, an iron core, a magnet, and a balancing plate. The rotating shaft is provided with a first oil inlet hole and a second oil inlet hole, the iron core is connected to the rotating shaft, and the iron core is provided with a first channel and a second channel. The balancing plate includes a first balancing plate and a second balancing plate arranged at both axial ends of the iron core, each of which is provided with an oil channel. The oil inlet end of the first channel is connected to the first oil inlet hole through the oil channel on the first balancing plate, and the oil outlet end of the first channel is connected to the oil channel on the second balancing plate. The oil inlet end of the second channel is connected to the second oil inlet hole through the oil channel on the second balancing plate, and the oil outlet end of the second channel is connected to the oil channel on the first balancing plate.

[0009] According to an embodiment of the first aspect of the present disclosure, a motor rotor assembly is provided with a first oil inlet and a second oil inlet on the rotating shaft, thereby distributing the cooling oil in the rotating shaft and improving the oil balance between the two oil inlets. Two cooling oil circuits are provided on the motor rotor assembly to balance the cooling oil in the two oil inlets. The first cooling oil circuit includes a first oil inlet, an oil channel on a first balancing plate, a first channel, and an oil channel on a second balancing plate. The first cooling oil circuit passes through the rotating shaft axially, enters the iron core through the oil channel on the first balancing plate, and flows into the oil channel on the second balancing plate along the axial direction of the iron core, thereby cooling both the rotating shaft and the iron core. Simultaneously, the second cooling oil circuit includes a second oil inlet, an oil channel on the second balancing plate, a second channel, and an oil channel on the first balancing plate, thereby cooling both the rotating shaft and the iron core. The two cooling oil circuits achieve balanced heat dissipation for the motor rotor assembly, with the cooling effects superimposed, thereby optimizing the rotor's cooling capacity.

[0010] Additional aspects and advantages of the present disclosure will be set forth in part in the following description and, in part, will be obvious from the following description, or may be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a cross-sectional schematic diagram of a motor rotor assembly in some embodiments of the present disclosure;

[0012] FIG2 is a perspective schematic diagram of a motor rotor assembly in some embodiments of the present disclosure;

[0013] FIG3 is a schematic diagram of a rotating shaft in some embodiments of the present disclosure;

[0014] FIG4 is another schematic diagram of a rotating shaft in some embodiments of the present disclosure;

[0015] FIG5 is a partial schematic diagram of a rotor core with magnets installed in some embodiments of the present disclosure;

[0016] FIG6 is a structural diagram of a balancing plate on the side facing the core in some embodiments of the present disclosure;

[0017] FIG7 is a partial enlarged view of point A in FIG1 ;

[0018] FIG8 is a side view of a balance board according to some embodiments of the present disclosure;

[0019] FIG9 is a structural diagram of a balancing plate on a side away from the core in some embodiments of the present disclosure;

[0020] FIG10 is a cross-sectional schematic diagram of an oil pipe and an oil inlet nozzle in some embodiments of the present disclosure;

[0021] FIG11 is another schematic diagram of a rotating shaft in some embodiments of the present disclosure.

[0022] Reference numerals:

[0023] Motor rotor assembly 100,

[0024] Rotating shaft 1, center hole 10, first oil inlet hole 11, second oil inlet hole 12, first bearing oil hole 13, second bearing oil hole 14,

[0025] Iron core 2, first channel 21, second channel 22, mounting hole 23, magnet 30,

[0026] Balance plate 4, oil channel 400, first oil channel 401, second oil channel 402, radial inner hole 403, oil outlet hole 440, radial oil outlet hole 441, axial oil outlet hole 442,

[0027] Dispersed hole segment 46, inner connecting segment 461, arcuate segment 462, middle connecting segment 463, outer connecting segment 464,

[0028] The connecting hole section 47, the first balance plate 41, the second balance plate 42,

[0029] Oil pipe 5, inlet end 50, first pipe hole 51, second pipe hole 52, oil inlet nozzle 60, pressure ring 70,

[0030] The first cooling oil passage R1 and the second cooling oil passage R2. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure.

[0032] Some motor rotor assemblies 100 according to embodiments of the present disclosure are described below with reference to FIG. 1 to FIG. 11 .

[0033] As shown in FIG. 1 and FIG. 2 , the motor rotor assembly 100 according to some embodiments of the first aspect of the present disclosure includes a rotating shaft 1 , an iron core 2 , and a balancing plate 4 .

[0034] As shown in Figures 3 and 4, the rotating shaft 1 is provided with a first oil inlet hole 11 and a second oil inlet hole 12. After the cooling oil enters the rotating shaft 1, it flows out of the rotating shaft 1 through the first oil inlet hole 11 and the second oil inlet hole 12, respectively. The cooling oil enters different cooling oil circuits through the first oil inlet hole 11 and the second oil inlet hole 12, thereby distributing the cooling oil after leaving the rotating shaft 1. The provision of the first oil inlet hole 11 and the second oil inlet hole 12 improves the balanced distribution of the cooling oil and avoids the problem of uneven cooling oil outflow caused by a single oil inlet hole.

[0035] As shown in Figure 1, the core 2 is connected to the rotating shaft 1 and is provided with a first channel 21 and a second channel 22. The first channel 21 and the second channel 22 extend axially through the core 2. When cooling oil flows through the first and second channels 21, 22, it flows from within the core 2, providing cooling. Specifically, when the temperature inside the core 2 rises, excess heat is transferred to the cooling oil, which then exchanges heat with the core 2. The cooling oil then flows out, removing the absorbed excess heat, thereby directly and evenly cooling the core 2.

[0036] Optionally, the first channel 21 and the second channel 22 are hollow, which is not only conducive to guiding the cooling oil, but also has a weight-reducing effect, thereby improving the working efficiency of the motor rotor assembly 100.

[0037] As shown in Figures 1 and 2, the balancing plates include a first balancing plate 41 and a second balancing plate 42, which are disposed at the axial ends of the iron core 2. It can be seen that the function of the balancing plates 4 is to eliminate the unbalanced mass of the motor rotor assembly 100, improve the dynamic balancing accuracy of the motor rotor assembly 100, and thus enhance the performance and life of the motor.

[0038] As shown in FIG1 , each balancing plate 4 is provided with an oil passage 400 , which serves to disperse cooling oil.

[0039] An oil inlet end of the first channel 21 is connected to the first oil inlet hole 11 through an oil channel 400 on the first balancing plate 41 , and an oil outlet end of the first channel 21 is connected to the oil channel 400 on the second balancing plate 42 .

[0040] Specifically, a portion of the cooling oil in the rotating shaft flows out from the first oil inlet hole 11, passes through the first balancing plate 41 and enters the first channel 21 in the iron core 2, flows through the penetrating first channel 21, takes away the excess heat generated by the iron core 2 during operation, and finally flows out of the motor rotor assembly 100 through the oil channel 400 on the second balancing plate 42, thereby cooling the iron core 2.

[0041] Similarly, the oil inlet of the second channel 21 connects to the second oil inlet hole 12 via the oil passage 400 on the second balancing plate 42, while the oil outlet of the second channel 21 connects to the oil passage 400 on the first balancing plate 41. This means that another portion of the cooling oil in the rotating shaft 1 exits the second oil inlet hole 12 of the rotating shaft 1, passes through the second balancing plate 42, and enters the second channel 22 in the iron core 2. Heat is exchanged between the iron core 2 and the cooling oil in the second channel 22, and excess heat from the iron core 2 is transferred to the cooling oil in the second channel 22. After absorbing heat, the cooling oil is discharged from the motor rotor assembly 100 through the oil passage 400 on the first balancing plate 41, cooling the iron core 2. This achieves a combined heat dissipation between the first channel 21 and the second channel 22.

[0042] With this arrangement, the cooling oil in the rotating shaft can be divided into two parts, entering the first channel 21 and the second channel 22 from the first oil inlet hole 11 and the second oil inlet hole 12 respectively, ensuring that the cooling oil in the two channels is balanced and that the motor rotor assembly 100 is symmetrically inletted with oil at the same time, thereby ensuring dynamic balance.

[0043] As shown in FIG. 1 , on each balancing plate 4 , the oil passage 400 includes a first oil passage 401 and a second oil passage 402 that are not connected to each other.

[0044] On the first balancing plate 41, the first oil passage 401 communicates with the first oil inlet hole 11 and the first channel 21, while the second oil passage 402 is separated from the first oil inlet hole 11 and communicates with the second channel 22. Specifically, the ends of the first channel 21 respectively communicate with the first oil passage 401 on the first balancing plate 41 and the first oil passage 401 on the second balancing plate 42.

[0045] On the second balancing plate 42, the first oil passage 401 is separated from the second oil inlet hole 12 and communicates with the first channel 21. The second oil passage 402 communicates with the second oil inlet hole 12 and the second channel 22. Similarly, the ends of the second channel 22 communicate with the second oil passage 402 on the first balancing plate 41 and the second oil passage 402 on the second balancing plate 42, respectively.

[0046] As shown in Figure 1, the motor rotor assembly 100 includes two cooling oil circuits: a first cooling oil circuit R1 and a second cooling oil circuit R2. The first cooling oil circuit R1 includes a first oil inlet 11, a first oil passage 401 on the first balancing plate 41, a first channel 21, and a first oil passage 401 on the second balancing plate 42. Meanwhile, the second cooling oil circuit R2 includes a second oil inlet 12, a second oil passage 402 on the second balancing plate 42, a second channel 22, and the second oil passage 402 on the first balancing plate 41.

[0047] The cooling oil in the first cooling oil circuit R1 flows out of the rotating shaft 1 along the first oil inlet hole 11 of the rotating shaft 1, enters the iron core 2 through the first oil channel 401 of the first balancing plate 41, and flows along the axial first channel 21 of the iron core 2 into the first oil channel 401 of the second balancing plate 42, thereby cooling both the rotating shaft 1 and the iron core 2. Similarly, the cooling oil in the first cooling oil circuit R1 flows through the rotating shaft 1 and the iron core 2, achieving joint cooling with the cooling oil in the first cooling oil circuit R1. The two cooling oil circuits achieve joint heat dissipation, resulting in more balanced cooling of the iron core 2 and a cumulative cooling effect, thereby optimizing the cooling capacity of the motor rotor assembly 100.

[0048] In some embodiments, the first cooling oil circuit R1 and the second cooling oil circuit R2 are independent of each other, and the cooling oil flows in opposite directions. The two oil circuits jointly dissipate heat for the motor rotor assembly 100 .

[0049] It is worth noting that when multiple cooling oil circuits enter from one side of the iron core and flow out from the other side, the large amount of heat absorbed at one end entering the iron core will cause the heat absorption capacity of these cooling oil circuits on the other side to decrease, resulting in inconsistent temperatures on both sides of the iron core and inability to achieve balanced cooling.

[0050] In the technical solution disclosed herein, the cooling oil flows in opposite directions as it passes through the first oil passage 401 and the second oil passage 402, effectively allowing the two oil passages to enter the iron core 2 from opposite ends. This prevents uneven heat absorption and allows for more uniform heat absorption across all parts of the iron core 2, helping to achieve balanced heat dissipation from the iron core 2 and reducing temperature unevenness. This improves the cooling effect of the iron core 2, protects the iron core 2, and extends its service life.

[0051] According to some embodiments of the motor rotor assembly 100 disclosed herein, a radial oil outlet hole 441 is provided on the side of the balance plate 4 facing away from the rotating shaft 1, and a radial inner hole 403 is provided on the side of the balance plate 4 facing the rotating shaft 1. The cooling oil flowing through the balance plate 4 flows out through the radial oil outlet hole 441, taking away the excess heat in the iron core 2, thereby achieving the cooling effect of the motor rotor assembly 100. In addition, the radial oil outlet hole 441 also provides a passage for the cooling oil to be discharged to the outside of the iron core 2, avoiding the problem of excessive weight of the motor rotor assembly 100 caused by excessive cooling oil stored in the iron core 2. The radial oil outlet hole 441 is arranged to extend radially along the balance plate 4, which can effectively reduce the space occupied by the oil channel 400 in the motor rotor assembly 100, making the layout of the motor rotor assembly 100 compact.

[0052] The oil passage 400 further includes a dispersion hole section 46 . The dispersion hole section 46 connects the radial inner hole 403 and the radial oil outlet hole 441 , so as to guide the cooling oil in the radial inner hole 403 into the radial oil outlet hole 441 .

[0053] The two ends of the first channel 21 on the iron core 2 face and connect to the two dispersion hole sections 46 of the first oil passages 401. The two ends of the second channel 22 face and connect to the two dispersion hole sections 46 of the second oil passages 402. The dispersion hole sections 46 disperse the cooling oil across the surface of the balancing plate 4, allowing the cooling oil to better cover the surfaces at both ends of the iron core 2 and improve heat dissipation. Within the same cooling oil circuit, the dispersion hole sections 46 on one balancing plate 4 disperse the cooling oil and direct it into the corresponding oil passages 400. The dispersion hole sections 46 on the other balancing plate 4 gather the cooling oil and carry it away from the motor rotor assembly 100.

[0054] As shown in FIG. 6 , according to the motor rotor assembly 100 of some embodiments of the present disclosure, the dispersed hole segment 46 includes an arcuate sub-segment 462 , an inner connecting sub-segment 461 , and an outer connecting sub-segment 464 .

[0055] The arcuate sub-segment 462 extends around the rotating shaft 1. The arcuate sub-segment 462 extends along the circumference of the rotating shaft 1 to form an arcuate cooling oil path to cover part of the interior of the core 2, increase the contact area with the core 2, and facilitate heat dissipation.

[0056] The inner connecting sub-segment 461 intersects and communicates with the arcuate sub-segment 462 , and one end of the inner connecting sub-segment 461 facing the rotating shaft 1 is connected to the radial inner hole 403 . Cooling oil enters the inner connecting sub-segment 461 through the radial inner hole 403 and then enters the arcuate sub-segment 462 .

[0057] The outer connecting sub-segment 464 intersects and communicates with the arcuate sub-segment 462. The end of the outer connecting sub-segment 464 facing away from the rotating shaft 1 is connected to the radial oil outlet hole 441. After the cooling oil enters the arcuate sub-segment 462, it passes through the outer connecting sub-segment 464 and finally leaves the motor rotor assembly 100 through the radial spray hole.

[0058] According to some embodiments of the present disclosure, the motor rotor assembly 100 includes at least two radially spaced arcuate sub-segments 462 within the dispersed hole segment 46. The dispersed hole segment 46 also includes a connecting sub-segment 463 connecting two radially adjacent arcuate sub-segments 462. Specifically, the cooling oil flows through the balance plate 4 along the following path: radial inner hole 403 - inner connecting sub-segment 461 - arcuate sub-segment 462 closer to the shaft 1 - connecting sub-segment 463 - arcuate sub-segment 462 farther from the shaft 1 - outer connecting sub-segment 464 - radial oil outlet 441.

[0059] As shown in FIG1 , according to some embodiments of the present disclosure, a motor rotor assembly 100 includes an axially extending mounting hole 23 formed in the iron core 2. The magnet 30 of the motor rotor assembly 100 fits within the mounting hole 23. The mounting hole 23 provides a stable mounting position for the magnet 30, ensuring that the magnet 30 does not fall off during operation of the motor rotor assembly 100.

[0060] Because the magnetic resistance of the magnet 30 increases accordingly under high temperatures, it can lead to insufficient motor power, and in severe cases, can cause demagnetization of the magnet 30. Therefore, multiple external connecting sub-segments 464 are provided, each of which is arranged opposite a magnet 30 and extends along the extension direction of the magnet 30 to the radial oil outlet 441. The cooling oil in the external connecting sub-segment 464 cools the adjacent magnets 30, and the cooling oil after heat exchange is brought out of the iron core 2 through the radial oil outlet 441, achieving heat dissipation of the magnet 30, avoiding the problem of increased magnetic resistance due to high temperature, and also avoiding the problem of demagnetization of the magnet 30, thereby ensuring the service life of the motor.

[0061] According to some embodiments of the motor rotor assembly 100 disclosed herein, a dispersion hole segment 46 is formed on the surface of the balancing plate 4 connected to the iron core 2. This not only facilitates the cooling oil in the balancing plate 4 to be dispersed and then enter the iron core 2 for heat dissipation, but also facilitates the cooling oil after absorbing heat in the iron core 2 to be introduced into the balancing plate 4 for uniform discharge, thereby enhancing the heat dissipation effect of the iron core 2 and achieving a balanced heat dissipation effect.

[0062] As shown in Figures 7 and 9 , in accordance with some embodiments of the present disclosure, an axial oil outlet hole 442 is provided on the side of the balance plate 4 facing away from the iron core 2. The axial oil outlet hole 442 communicates with the oil passage 400. When cooling oil is ejected through the axial oil outlet hole 442, it removes heat from the surfaces of the two ends of the iron core 2.

[0063] As shown in Figures 1 and 7 , according to some embodiments of the present disclosure, each oil passage 400 of the motor rotor assembly 100 further includes a connecting hole segment 47. One end of the connecting hole segment 47 is connected to the axial oil outlet hole 442, and the other end is connected to the radial inner hole 403 or the distributed hole segment 46. This connecting hole segment 47 connects multiple cooling oil passages within the balancing plate 4, distributing the cooling oil to different cooling oil passages within the balancing plate 4, thereby achieving a cooling effect in which multiple cooling oil passages are collectively cooled.

[0064] According to some embodiments of the motor rotor assembly 100 disclosed herein, the first oil passages 401 and the second oil passages 402 on each balancing plate 4 are centrally symmetrically arranged. The first oil passages 401 and the second oil passages 402 are centrally symmetrically arranged relative to the rotating shaft 1. This arrangement facilitates evenly distributing cooling oil in the first oil passages 401 and the second oil passages 402 during rotation. This not only achieves uniform distribution of cooling oil in the two oil passages 400, ensuring dynamic balance during operation of the motor rotor assembly 100, but also achieves balanced heat dissipation in the two oil passages 400, facilitating balanced temperature differences within the motor rotor assembly 100, avoiding uneven cooling between the front and rear ends of the motor rotor assembly 100, and improving the motor's operating efficiency.

[0065] Since the balance plate 4 is close to the armature end of the motor, when the cooling oil is sprayed out from the axial oil outlet 442, the cooling oil can absorb heat from the armature end, thereby reducing the temperature of the armature end, reducing the temperature of the motor as a whole, and increasing the service life of the motor.

[0066] As shown in FIG1 , according to some embodiments of the present disclosure, a motor rotor assembly 100 includes an axially extending central hole 10 disposed within a rotating shaft 1. Central hole 10 communicates with a first oil inlet hole 11 and a second oil inlet hole 12. Cooling oil is introduced into the rotating shaft 1 through central hole 10, and central hole 10 communicates with both first and second oil inlet holes 11, 12, respectively, ensuring balanced distribution of cooling oil between the first and second oil inlet holes 11, 12.

[0067] As shown in FIG1 , the first channel 21 and the second channel 22 are respectively provided through the axial direction, thereby ensuring that the cooling oil can flow through the entire interior of the core 2 along its length, increasing the contact length between the core 2 and the cooling oil, improving the heat dissipation area of ​​the core 2, and ensuring that the core 2 and the cooling oil have sufficient time and area for heat exchange, thereby improving the heat dissipation effect of the core 2. This effectively prevents the core 2 from overheating.

[0068] As shown in FIG10 , the motor rotor assembly 100 according to some embodiments of the present disclosure further includes an oil pipe 5 mounted within the central hole 10. One end of the oil pipe 5 is an inlet end 50. The oil pipe 5 is provided with a first hole 51 and a second hole 52 spaced axially apart. The first hole 51 is adjacent to the first oil inlet hole 11, and the second hole 52 is adjacent to the second oil inlet hole 12. The oil pipe 5 is capable of directing cooling oil from the exterior of the motor rotor assembly 100 into the rotating shaft 1. The oil is then directed through the first hole 51 and the second hole 52 into the first oil inlet hole 11 and the second oil inlet hole 12, respectively, thereby absorbing heat from the cooling oil.

[0069] As shown in FIG10 , the motor rotor assembly 100 according to some embodiments of the present disclosure further includes an oil inlet nozzle 60, which is mounted at one end of the center hole 10 and has an interference fit with the inlet end 50 of the oil pipe 5. The oil pipe 5 and the oil inlet nozzle 60 are both assembled within the rotating shaft 1, and the oil inlet nozzle 60 and the oil pipe 5 have an interference fit to prevent the cooling oil from forming gaps between the oil inlet nozzle 60 and the oil pipe 5, which could result in uneven cooling oil distribution.

[0070] As shown in FIG11 , according to some embodiments of the present disclosure, a motor rotor assembly 100 further includes a first bearing oil hole 13 and a second bearing oil hole 14 in the rotating shaft 1 that communicate with the central hole 10. Cooling oil flows out of the central hole 10 of the rotating shaft 1 through the first bearing oil hole 13 and the second bearing oil hole 14.

[0071] The first bearing oil hole 13 is located on the side of the first oil inlet hole 11 away from the second oil inlet hole 12 to spray cooling oil into one bearing. The second bearing oil hole 14 is located on the side of the second oil inlet hole 12 away from the first oil inlet hole 11 to spray cooling oil into the other bearing. In some embodiments, the rotating shaft 1 is provided with a left bearing and a right bearing, respectively, located on either side of the iron core 2. The first bearing oil hole 13 is located near the left bearing, while the second bearing oil hole 14 is located near the right bearing. Some cooling oil enters the left bearing through the first bearing oil hole 13, while some cooling oil enters the right bearing through the second bearing oil hole 14. The cooling oil can lubricate the bearings.

[0072] In some embodiments, the motor rotor assembly 100 also includes a pressure ring 70, which is sleeved on the rotating shaft 1 and located at the end away from the oil inlet nozzle 60. The pressure ring 70 is tightly pressed against the outer side of the side balance plate 4, so that one end of the side balance plate 4 is close to the iron core 2, and the other end is adjacent to the pressure ring 70. The pressure ring 70 is interference fit with the rotating shaft 1 to ensure that the two balance plates 4 are tightly fitted with the iron core 2 to avoid leakage of cooling oil.

[0073] According to other embodiments of the present disclosure, a motor includes a housing, a stator assembly, and a rotor assembly. The stator assembly is mounted within the housing, and the rotor assembly is mounted within the housing and mated with the stator assembly. The rotor assembly is the motor rotor assembly 100 described in the aforementioned embodiment. The motors of the present disclosure have high heat dissipation efficiency.

[0074] According to some other embodiments of the present disclosure, an electric vehicle has a power motor that is the motor in the above embodiment.

[0075] 1 to 11 , a motor rotor assembly 100 according to a specific embodiment of the present disclosure will be described below.

[0076] 1-2 , the motor rotor assembly 100 includes a rotating shaft 1 , an iron core 2 , a magnet 30 , a first balancing plate 41 , a second balancing plate 42 , an oil pipe 5 , an oil inlet nozzle 60 and a pressure ring 70 .

[0077] Referring to Figures 3-4 , the rotating shaft 1 is provided with a center hole 10, a first oil inlet hole 11, a second oil inlet hole 12, a first bearing oil hole 13, and a second bearing oil hole 14. The center hole 10 extends axially along the rotating shaft 1. The first oil inlet hole 11, the second oil inlet hole 12, the first bearing oil hole 13, and the second bearing oil hole 14 are all connected to the center hole 10. The first oil inlet hole 11 and the second oil inlet hole 12 are spaced apart axially. The first bearing oil hole 13 is located on the side of the first oil inlet hole 11 away from the second oil inlet hole 12, and the second bearing oil hole 14 is located on the side of the second oil inlet hole 12 away from the first oil inlet hole 11.

[0078] 10 , the oil pipe 5 is installed in the center hole 10 and includes an inlet end 50, a first pipe hole 51, and a second pipe hole 52. The first pipe hole 51 and the second pipe hole 52 are spaced apart along the axial direction, with the first pipe hole 51 adjacent to the first oil inlet hole 11 and the second pipe hole 52 adjacent to the second oil inlet hole 12.

[0079] The oil inlet nozzle 60 is installed at one end of the central hole 10 , and the oil inlet nozzle 60 is interference-fitted on the inlet end 50 of the oil pipe 5 .

[0080] 1 , the pressure ring 70 is sleeved on the rotating shaft 1 , and the pressure ring 70 presses the side of the second balancing plate 42 away from the iron core 2 , and the pressure ring 70 and the rotating shaft 1 are interference fit.

[0081] The iron core 2 is sleeved on the rotating shaft 1. The iron core 2 is provided with a first channel 21, a second channel 22, and a mounting hole 23. The first channel 21 and the second channel 22 are respectively provided through the axial direction.

[0082] There are multiple magnets 30 that are cooperatively disposed in the mounting hole 23 of the iron core 2 .

[0083] The first and second balancing plates 41 and 42 are respectively disposed at the axial ends of the core 2. The first and second balancing plates 41 and 42 are both provided with oil passages 400, which include first and second oil passages 401 and 402 that are not connected to each other and are centrally symmetrically distributed.

[0084] 6 , each oil passage 400 includes a radial inner hole 403 , an oil outlet hole 440 , a dispersed hole section 46 , and a communication hole section 47 . The oil outlet hole 440 includes a radial oil outlet hole 441 and an axial oil outlet hole 442 .

[0085] 6-7 , the radial inner hole 403 is disposed toward the rotating shaft 1 .

[0086] 6-8 , the radial oil outlet hole 441 is provided on a side of the balancing plate 4 away from the rotating shaft 1 .

[0087] 6-7 and 9 , the axial oil outlet hole 442 is provided on the side of the balance plate 4 away from the core 2 ;

[0088] 6 , the dispersion hole section 46 is formed on the surface of the balancing plate 4 connected to the iron core 2 , and the dispersion hole section 46 is used to connect the radial inner hole 403 and the radial oil outlet hole 441 .

[0089] 1 , the two ends of the first channel 21 on the iron core 2 are respectively opposite to and connected to the dispersed hole sections 46 of the first oil channel 401 in the first balancing plate 41 and the second balancing plate 42 , and the two ends of the second channel 22 are respectively opposite to and connected to the dispersed hole sections 46 of the second oil channel 402 in the two balancing plates 4 .

[0090] One end of the communicating hole section 47 is connected to the axial oil outlet hole 442 , and the other end is connected to the radial inner hole 403 or the dispersing hole section 46 .

[0091] The radial inner hole 403 of the first oil passage 401 on the first balancing plate 41 faces and is connected to the first oil inlet hole 11 , and the radial inner hole 403 of the second oil passage 402 on the second balancing plate 42 faces and is connected to the second oil inlet hole 12 .

[0092] The first cooling oil circuit R1 is formed by the first oil inlet hole 11, the first oil channel 401 of the first balancing plate 41, the first oil channel 401 of the second balancing plate 42, and the first channel 21; the second cooling oil circuit R2 is formed by the second oil inlet hole 12, the second oil channel 402 of the first balancing plate 41, the second oil channel 402 of the second balancing plate 42, and the second channel 22, and the cooling oil flows in opposite directions in the first oil channel 401 and the second oil channel 402.

[0093] 6 , the dispersed hole segment 46 includes two arc-shaped sub-segments 462 , an inner connecting sub-segment 461 , a middle connecting sub-segment 463 , and a plurality of outer connecting sub-segments 464 .

[0094] The two arc-shaped sub-segments 462 are arranged at intervals along the radial direction, and both of the arc-shaped sub-segments 462 extend around the rotation axis 1 .

[0095] The inner connecting sub-segment 461 intersects and communicates with an arc-shaped sub-segment 462 , and one end of the inner connecting sub-segment 461 facing the rotating shaft 1 is connected to the radial inner hole 403 .

[0096] The connecting sub-segment 463 is connected between two radially adjacent arc-shaped sub-segments 462 .

[0097] The outer connecting sub-segment 464 intersects and connects with another arc-shaped sub-segment 462. The end of the outer connecting sub-segment 464 facing away from the rotating shaft 1 is connected to the radial oil outlet hole 441. Each outer connecting sub-segment 464 is arranged opposite to a magnet 30 and extends along the extension direction of the magnet 30 to the radial oil outlet hole 441.

[0098] The oil circuit of the motor rotor assembly 100 according to a specific embodiment of the present disclosure is described below.

[0099] The first cooling oil circuit R1 includes the following paths:

[0100] First branch: oil inlet nozzle 60 - first oil inlet hole 11 - first balancing plate 41 - first oil passage 401 - radial inner hole 403 - inner connecting sub-segment 461 - first arcuate sub-segment 462 - middle connecting sub-segment 463 - second arcuate sub-segment 462 - outer connecting sub-segment 464 - radial oil outlet hole 441 - first passage 21 - second balancing plate 42 - first oil passage 401 - radial inner hole 403 - inner connecting sub-segment 461 - first arcuate sub-segment 462 - middle connecting sub-segment 463 - second arcuate sub-segment 462 - outer connecting sub-segment 464 - radial oil outlet hole 441;

[0101] Second branch: oil inlet nozzle 60 - first oil inlet hole 11 - first balancing plate 41 - first oil passage 401 - radial inner hole 403 - inner connecting sub-segment 461 - first arcuate sub-segment 462 - middle connecting sub-segment 463 - second arcuate sub-segment 462 - outer connecting sub-segment 464 - radial oil outlet hole 441 - first passage 21 - second balancing plate 42 - first oil passage 401 - radial inner hole 403 - axial oil outlet hole 442;

[0102] The third branch: oil inlet nozzle 60 - first oil inlet hole 11 - first balance plate 41 - first oil channel 401 - radial inner hole 403 - axial oil outlet hole 442;

[0103] The second cooling oil circuit R2 also includes three branches, but the difference is that the path is: oil inlet nozzle 60-second oil inlet hole 12-second balance plate 42-second oil channel 402-second channel 22-first balance plate 41-second oil channel 402.

[0104] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0105] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

[0106] In the description of the present disclosure, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0107] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0108] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0109] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0111] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A motor rotor assembly, comprising: A rotating shaft, wherein a first oil inlet hole and a second oil inlet hole are formed on the rotating shaft; An iron core, the iron core is connected to the rotating shaft, and the iron core is provided with a first channel and a second channel; A balancing plate, the balancing plate comprising a first balancing plate and a second balancing plate arranged at two axial ends of the iron core, each of the balancing plates being provided with an oil passage; The oil inlet end of the first channel is connected to the first oil inlet hole through the oil channel on the first balance plate, and the oil outlet end of the first channel is connected to the oil channel on the second balance plate; The oil inlet end of the second channel is connected to the second oil inlet hole through the oil channel on the second balance plate, and the oil outlet end of the second channel is connected to the oil channel on the first balance plate.

2. The motor rotor assembly according to claim 1, wherein: On each of the balancing plates, the oil passages include a first oil passage and a second oil passage that are not connected to each other; On the first balancing plate, the first oil passage is communicated with the first oil inlet hole and the first channel, and the second oil passage is separated from the first oil inlet hole and communicated with the second channel; On the second balancing plate, the first oil passage is separated from the second oil inlet hole and communicated with the first channel, and the second oil passage is communicated with the second oil inlet hole and the second channel.

3. The motor rotor assembly according to claim 2, wherein: The balance plate is provided with a radial oil outlet hole on a side away from the rotating shaft, and a radial inner hole is provided on a side of the balance plate facing the rotating shaft; The oil passage further comprises: a dispersion hole section, the dispersion hole section communicating with the radial inner hole and the radial oil outlet hole; The two ends of the first channel on the iron core are respectively opposite to and connected to the two dispersed hole sections of the first oil channels, and the two ends of the second channel are respectively opposite to and connected to the two dispersed hole sections of the second oil channels.

4. The motor rotor assembly according to claim 3, wherein: The dispersed hole segment comprises: an arc-shaped sub-segment, the arc-shaped sub-segment extending around the rotation axis; an inner connecting sub-segment, the inner connecting sub-segment intersecting and communicating with the arc-shaped sub-segment, and one end of the inner connecting sub-segment facing the rotating shaft communicating with the radial inner hole; An externally connected sub-segment intersects and is connected with the arc-shaped sub-segment, and an end of the externally connected sub-segment away from the rotating shaft is connected with the radial oil outlet hole.

5. The motor rotor assembly according to claim 4, wherein: The arc-shaped sub-segments in the dispersed hole segment are at least two arc-shaped sub-segments spaced apart in radial direction, and the dispersed hole segment further comprises a connecting sub-segment connected between two radially adjacent arc-shaped sub-segments.

6. The motor rotor assembly according to any one of claims 4 or 5, wherein: The iron core is provided with a mounting hole which penetrates in the axial direction, and the magnet of the motor rotor assembly is fitted in the mounting hole; There are a plurality of external connection sub-segments, each of which is arranged opposite to one of the magnets and extends to the radial oil outlet along the extension direction of the magnet.

7. The motor rotor assembly according to any one of claims 3 to 6, wherein: The dispersion hole segments are formed on a surface of the balancing plate connected to the iron core.

8. The motor rotor assembly according to any one of claims 3 to 7, wherein: An axial oil outlet hole is arranged on the side of the balance plate away from the iron core, and the axial oil outlet hole is connected to the oil passage.

9. The motor rotor assembly according to claim 8, wherein: Each of the oil passages further includes a connecting hole section, one end of which is connected to the axial oil outlet hole, and the other end of which is connected to the radial inner hole or the dispersed hole section.

10. The motor rotor assembly according to any one of claims 2 to 9, wherein: On each of the balancing plates, the first oil passages and the second oil passages are centrally symmetrically distributed.

11. The motor rotor assembly according to any one of claims 1 to 10, wherein: A central hole extending in the axial direction is provided in the rotating shaft, and the central hole is connected to the first oil inlet hole and the second oil inlet hole, and the first oil inlet hole and the second oil inlet hole are spaced apart in the axial direction.

12. The motor rotor assembly according to claim 11, further comprising: An oil pipe is installed in the center hole, one end of which is the inlet end. The oil pipe is provided with a first tube hole and a second tube hole which are spaced apart along the axial direction. The first tube hole is adjacent to the first oil inlet hole, and the second tube hole is adjacent to the second oil inlet hole.

13. The motor rotor assembly according to any one of claims 11 or 12, wherein: The rotating shaft is also provided with a first bearing oil hole and a second bearing oil hole connected to the central hole; The first bearing oil hole is located on a side of the first oil inlet hole away from the second oil inlet hole, so as to spray cooling oil to a bearing; The second bearing oil hole is located on a side of the second oil inlet hole away from the first oil inlet hole so as to spray cooling oil to the other bearing.

14. A motor, comprising: case; a stator assembly, the stator assembly being installed in the housing; A rotor assembly, wherein the rotor assembly is the motor rotor assembly according to any one of claims 1 to 13, and the rotor assembly is installed in the housing and cooperates with the stator assembly.

15. An electric vehicle comprising: A motor as claimed in claim 14.

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