Oil-cooled motor rotor assembly, motor and vehicle

Abstract

The utility model provides an oil-cooled motor rotor assembly, a motor and a vehicle, and belongs to the technical field of motor cooling, and the oil-cooled motor rotor assembly comprises a rotating shaft, a rotor iron core, and two balance plates connected to the two ends of the rotor iron core; a first oil duct is axially arranged in the rotating shaft, a first oil inlet hole is formed in the first oil duct, and the first oil inlet hole is located at one end of the rotor iron core; the balance plate is provided with a first oil outlet hole, the first oil outlet hole penetrates through the two end faces of the balance plate, and the output end of the first oil inlet hole communicates with the input end, close to one end of the first oil inlet hole, of the first oil outlet hole. According to the oil-cooled motor rotor assembly, the first oil outlet hole is formed in the balance plate, and the first oil outlet hole penetrates through the two end faces of the balance plate, so that cooling oil in the rotating shaft can be thrown out from the first oil outlet hole to reach the bearing at the end part, the cooling effect on the bearing is improved, and the reliability of the motor is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of motor cooling, and in particular to an oil-cooled motor rotor assembly, a motor and a vehicle. Background Art

[0002] Lightweight and miniaturization of new energy vehicles is the development direction of new energy drive assembly. Oil-cooled motors have the characteristics of compact structure, small size, high energy density, etc., and gradually become the main cooling method for new energy motor cooling solutions.

[0003] At present, oil-cooled motor rotors generally have oil outlet holes on the balance plates at both ends, allowing the cooling oil that enters the shaft to be thrown out from the balance plates under the action of centrifugal force and reach both ends of the shaft. However, this method is mainly used to cool the windings and cannot effectively cool the bearings installed at the ends of the shaft. Utility Model Content

[0004] In view of this, the present application aims to propose an oil-cooled motor rotor assembly to solve the problem that the prior art cannot effectively cool the end bearing.

[0005] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0006] An oil-cooled motor rotor assembly comprises a rotating shaft, a rotor core sleeved on the rotating shaft, and two balancing plates connected at two ends of the rotor core;

[0007] A first oil passage is axially arranged inside the rotating shaft, a first oil inlet hole is arranged on the first oil passage, and the first oil inlet hole is located at one end of the rotor core;

[0008] The balancing plate is provided with a first oil outlet hole, which passes through two end surfaces of the balancing plate, and the output end of the first oil inlet hole is connected to the input end of the first oil outlet hole close to one end of the first oil inlet hole.

[0009] Furthermore, a second oil inlet hole is provided on the first oil channel, and the second oil inlet hole is located at an end of the rotor core away from the first oil inlet hole, and the first oil inlet hole and the second oil inlet hole are not on the same straight line; the output end of the second oil inlet hole is connected to the input end of the first oil outlet hole close to one end of the second oil inlet hole.

[0010] Furthermore, a second oil outlet hole is provided on the balance plate, and the second oil outlet hole is provided through the two end surfaces of the balance plate; a plurality of second oil channels are axially provided inside the rotor core, and the input end of the second oil channel is connected to the first oil outlet hole on the first balance plate of the two balance plates, and the output end is connected to the second oil outlet hole on the second balance plate of the two balance plates.

[0011] Furthermore, the cross-sectional area of ​​the first oil outlet hole is smaller than the cross-sectional area of ​​the second oil outlet hole, and the cross-sectional area of ​​the second oil outlet hole is smaller than the cross-sectional area of ​​the second oil passage.

[0012] Furthermore, the first oil outlet hole and the second oil outlet hole are both arranged along the axial direction of the balance plate.

[0013] Furthermore, on the same balancing plate, a plurality of the first oil outlet holes and a plurality of the second oil outlet holes are provided, and are distributed at intervals around the circumference of the balancing plate, and the first oil outlet holes and the second oil outlet holes are arranged alternately.

[0014] Furthermore, a first oil groove is provided on one side of the balance plate close to the rotor core, the first oil outlet is provided in the first oil groove, the first oil groove is connected to the first oil inlet or the second oil inlet, and the first oil groove is connected to the second oil channel.

[0015] Furthermore, the first oil inlet hole and the second oil inlet hole are both arranged along the radial direction of the rotating shaft, and the first oil groove is arranged along the radial direction of the balancing plate.

[0016] Furthermore, a second oil groove is provided on one side of the balancing plate close to the rotor core, the second oil outlet hole is provided in the second oil groove, and the second oil groove is communicated with the second oil channel.

[0017] Furthermore, the rotor core includes a plurality of punching sheets, each of which is provided with an oil hole, and the plurality of punching sheets are overlapped so that the oil holes are connected to form the second oil channel.

[0018] Compared with the prior art, the oil-cooled motor rotor assembly described in this application has the following advantages:

[0019] (1) The oil-cooled motor rotor assembly described in the present application has a first oil channel axially arranged inside the rotating shaft, a first oil inlet hole arranged on the first oil channel, and the first oil inlet hole is located at one end of the rotor core; a first oil outlet hole is arranged on the balancing plate, and the first oil outlet hole is arranged through the two end surfaces of the balancing plate, and the output end of the first oil inlet hole is connected to the input end of the first oil outlet hole near one end of the first oil inlet hole. The present application provides a first oil outlet hole on the balancing plate, and the first oil outlet hole is arranged through the two end surfaces of the balancing plate. When the rotor rotates, the cooling oil inside the rotating shaft can be thrown out from the first oil outlet hole under the action of centrifugation and reach the bearing at the end, thereby realizing lubrication and cooling of the bearing and improving the cooling effect of the bearing.

[0020] (2) The oil-cooled motor rotor assembly described in the present application can form four different groups of oil circuits by setting a first oil channel, a first oil inlet hole, a second oil inlet hole, a second oil channel, a first oil outlet hole and a second oil outlet hole. Two groups of oil circuits can realize oil flow to the inside of the rotor core from both ends of the rotor core respectively, and then throw the oil through the second oil outlet hole, which can not only realize the cooling of the rotor core, but also can throw the oil to both ends of the motor winding through the second oil outlet hole under the action of centrifugation when the rotor rotates, so as to realize the cooling of the motor winding; the other two groups of oil circuits do not pass through the rotor core, and can directly lead the cooling oil inside the shaft to the bearings at both ends of the shaft, so as to cool the bearings at both ends of the rotor structure. The oil-cooled motor rotor assembly described in the present application can not only cool the bearings and windings at both ends of the rotor assembly, but also cool the rotor core in the middle of the rotor assembly, so as to avoid demagnetization due to overheating of the magnetic steel, improve the cooling effect of the rotor structure as a whole, and ensure the reliability of the motor.

[0021] (3) In the oil-cooled motor rotor assembly described in the present application, the cross-sectional area of ​​the first oil outlet hole is smaller than the cross-sectional area of ​​the second oil outlet hole, and the cross-sectional area of ​​the second oil outlet hole is smaller than the cross-sectional area of ​​the second oil channel. By controlling the cross-sectional areas of the first oil outlet hole, the second oil outlet hole, and the second oil channel, the flow rate of the cooling oil in each group of oil channels can be reasonably distributed, thereby ensuring that a sufficient amount of cooling oil passes through the interior of the rotor core and that coolant can be sprayed out from the first oil outlet hole, so that the rotor core located in the middle of the rotor assembly and the bearings or gears located at the ends can obtain relatively uniform cooling, further ensuring the cooling effect of the entire rotor structure.

[0022] Another object of the present application is to provide an electric motor, comprising the oil-cooled electric motor rotor assembly as described above.

[0023] The advantages of the motor and the above-mentioned oil-cooled motor rotor assembly over the prior art are the same and will not be described in detail here.

[0024] The present application also provides a vehicle, comprising the oil-cooled motor rotor assembly or the motor as described above.

[0025] The advantages of the vehicle and the above-mentioned oil-cooled motor rotor assembly over the prior art are the same and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the oil-cooled motor rotor assembly described in an embodiment of the present application;

[0028] Figure 2A schematic diagram of a cooling oil circuit of an oil-cooled motor rotor assembly according to an embodiment of the present application;

[0029] Figure 3 This is a schematic diagram of the structure of the rotating shaft in the oil-cooled motor rotor assembly according to an embodiment of the present application;

[0030] Figure 4 A cross-sectional view of a rotating shaft in an oil-cooled motor rotor assembly according to an embodiment of the present application;

[0031] Figure 5 This is a schematic diagram of the structure of a balancing plate in an oil-cooled motor rotor assembly according to an embodiment of the present application;

[0032] Figure 6 This is a schematic structural diagram of a rotor core in an oil-cooled motor rotor assembly according to an embodiment of the present application;

[0033] Figure 7 This is a schematic diagram of the internal structure of the motor described in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 101, housing; 102, rotor assembly; 103, stator assembly; 104, bearing;

[0036] 201, rotating shaft; 202, balancing plate; 203, rotor core; 204, magnetic steel; 205, core pressing ring;

[0037] 301, first oil channel; 302, first oil inlet hole; 303, second oil inlet hole;

[0038] 401, first oil groove; 402, first oil outlet hole; 403, second oil groove; 404, second oil outlet hole;

[0039] 501, oil hole; 502, second oil passage. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0041] In addition, the directions or positional relationships indicated by "inside", "outside", "left", "right", etc. mentioned in the embodiments of the present application are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, relational terms such as "first" and "second" are merely used to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities, nor can they be understood as indicating or implying relative importance.

[0042] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] In the related art, oil-cooled motor rotors generally have radial oil outlet holes on the balance plates at both ends, so that the cooling oil entering the shaft is thrown out from the balance plates under the action of centrifugal force and reaches the armature windings at both ends of the shaft to cool the windings. However, this method is not ideal for cooling the bearings at the ends of the shaft.

[0044] In view of this, an embodiment of the present application provides an oil-cooled motor rotor assembly.

[0045] See also Figure 1 and Figure 2 An oil-cooled motor rotor assembly includes a rotating shaft 201, a rotor core 203 sleeved on the rotating shaft 201, and two balancing plates 202 connected at both ends of the rotor core 203.

[0046] A first oil passage 301 is axially disposed inside the rotating shaft 201 . A first oil inlet hole 302 is disposed on the first oil passage 301 . The first oil inlet hole 302 is located at one end of the rotor core 203 .

[0047] The balancing plate 202 is provided with a first oil outlet hole 402 , which passes through two end surfaces of the balancing plate 202 , and the output end of the first oil inlet hole 302 is connected to the input end of the first oil outlet hole 402 close to one end of the first oil inlet hole 302 .

[0048] See also Figure 1The rotor assembly 102 includes a rotating shaft 201, a balancing plate 202, a rotor core 203, a magnetic steel 204, a core pressing ring 205 and other parts. The rotating shaft 201 is a hollow structure, and a first oil channel 301 for conveying cooling oil is arranged axially inside. One end of the first oil channel 301 is open for injecting cooling oil, and the other end is closed. A first oil inlet hole 302 is arranged on the first oil channel 301, and the first oil inlet hole 302 is located at the left end of the rotor core 203. The balancing plate 202 is arranged at both ends of the rotor core 203, and is connected to the rotor core 203 through a keyway. The balancing plate 202 is a disc-shaped structure, and the disc surfaces on the left and right sides are end surfaces. The first oil outlet hole 402 is a through hole arranged through the end surfaces of both ends of the balancing plate 202, and the position of the first oil outlet hole 402 is set according to the position of the bearing ball.

[0049] Since the first oil inlet 302 at the left end of the rotating shaft is connected to the first oil outlet 402 on the left end balance plate 202, when the rotor rotates, the cooling oil introduced into the rotating shaft 201 flows along the first oil passage 301, and is thrown out from the first oil outlet 402 under the centrifugal effect, reaching the left end bearing, thereby cooling the bearing. Furthermore, a second oil inlet 303 is also provided on the first oil passage 301, and the second oil inlet 303 is located at one end of the rotor core 203 away from the first oil inlet 302, and the first oil inlet 302 and the second oil inlet 303 are not on the same straight line; the output end of the second oil inlet 303 is connected to the input end of the first oil outlet 402 near one end of the second oil inlet 303.

[0050] For details, see Figure 2 The first oil passage 301 is also provided with a second oil inlet hole 303, which is located at the right end of the rotor core 203 and communicates with the first oil outlet hole 402 on the right end balance plate 202. Therefore, when the rotor rotates, the cooling oil inside the shaft 201 flows along the first oil passage 301 to the second oil inlet hole 303, and can be ejected from the first oil outlet hole 402 at the right end under the centrifugal effect to reach the bearing at the right end for lubrication and cooling.

[0051] The number of the first oil inlet holes 302 and the second oil inlet holes 303 is related to the number of rotor pole pairs, and is set to be a multiple of the number of pole pairs. Figure 3 The first oil inlet hole 302 and the second oil inlet hole 303 are cross-distributed on the rotating shaft 201 and are not on the same straight line. The specific position on the rotating shaft 201 can be set according to the oblique pole angle of the rotor core 203 on the rotating shaft 201.

[0052] Furthermore, a second oil outlet hole 404 is provided on the balancing plate 202, and the second oil outlet hole 404 is provided through the two end surfaces of the balancing plate 202; a plurality of second oil passages 502 are axially arranged inside the rotor core 203, and the input end of the second oil passage 502 is connected to the first oil outlet hole 402 on the first balancing plate of the two balancing plates 202, and the output end is connected to the second oil outlet hole 404 on the second balancing plate of the two balancing plates 202.

[0053] Specifically, the position of the second oil outlet hole 404 is set according to the position of the end winding, and the cooling oil thrown out from the second oil outlet hole 404 is mainly used to cool the end winding. The first oil outlet hole 402 and the second oil outlet hole 404 are opened on the two balancing plates 202, and the cooling oil flowing out from the first oil outlet hole 402 and the second oil outlet hole 404 can cool the bearings and the inner ring of the winding at both ends of the rotor structure. Figure 2 , a plurality of second oil passages 502 are axially arranged inside the rotor core 203, one end of the second oil passage 502 is communicated with the first oil outlet hole 402 on the left end balance plate 202, and the other end is communicated with the second oil outlet hole 404 on the right end balance plate 202, or one end of the second oil passage 502 is communicated with the first oil outlet hole 402 on the right end balance plate 202, and the other end is communicated with the second oil outlet hole 404 on the left end balance plate 202. In this way, the cooling oil reaching the first oil outlet hole 402 from the inside of the rotating shaft 201 can be diverted to the second oil passage 502, and the rotor core 203 is cooled when passing through the rotor core 203, and finally thrown out from the second oil outlet hole 404 to cool the end winding.

[0054] Furthermore, the first oil outlet hole 402 and the second oil outlet hole 404 are both arranged along the axial direction of the balancing plate 202 .

[0055] Compared with the conventional rotor structure in which the oil outlet holes on the balance plate are arranged radially along the balance plate, the axial first oil outlet hole 402 and the second oil outlet hole 404 can form a larger oil outlet angle when the cooling oil is thrown out. The oil outlet angle and direction can be easily adjusted by controlling the speed of the motor so that the cooling oil can better cover the end of the rotor structure and enhance the cooling effect on the bearings 104 at both ends and the winding ends.

[0056] In this embodiment, the first oil outlet hole 402 is arranged along the axial direction of the balance plate 202. In other embodiments, the first oil outlet hole 402 can also be set as an inclined hole according to the position of the ball of the bearing 104, that is, the axis of the first oil outlet hole 402 forms a certain angle with the axis of the rotating shaft 201. For example, when the ball of the bearing 104 is far away from the axis of the rotating shaft 201, the angle between the axis of the first oil outlet hole 402 and the axis of the rotating shaft 201 can be appropriately increased to ensure that the oil can reach the position of the ball when it is sprayed out from the first oil outlet hole 402, thereby ensuring the cooling effect on the bearing 104.

[0057] Furthermore, the cross-sectional area of ​​the first oil outlet hole 402 is smaller than the cross-sectional area of ​​the second oil outlet hole 404 , and the cross-sectional area of ​​the second oil outlet hole 404 is smaller than the cross-sectional area of ​​the second oil passage 502 .

[0058] Specifically, the first oil outlet hole 402 and the second oil outlet hole 404 are respectively connected to the two ends of the second oil channel 502. The cross-sectional area of ​​the first oil outlet hole 402 is smaller than the cross-sectional area of ​​the second oil outlet hole 404, so that a pressure difference is formed at the two ends of the second oil channel 502, which can push the cooling oil to flow from one end of the first oil outlet hole 402 along the second oil channel 502 to one end of the second oil outlet hole 404, avoiding no or only a small amount of cooling oil passing through the second oil channel 502, thereby ensuring the cooling effect on the rotor core 203.

[0059] The cross-sectional area of ​​the second oil outlet hole 404 is smaller than the cross-sectional area of ​​the second oil passage 502, which can avoid the situation where all the cooling oil flows out of the second oil outlet hole 404 while no cooling oil flows through one end of the first oil outlet hole 402, thereby ensuring flow distribution. The position of the second oil outlet hole 404 can be designed according to the position of the stator winding, so that the cooling oil in the second oil outlet hole 404 can be thrown to the inner ring of the end of the stator winding under the centrifugal effect of the rotor for cooling, thereby reducing the winding temperature and improving the motor efficiency.

[0060] Since the cross-sectional area of ​​the first oil outlet 402 is small, the resistance of the cooling oil flowing out of the first oil outlet 402 is large, so it can be sprayed out at a high speed, and the sprayed cooling oil is close to a straight line. By controlling the speed of the motor, the direction and angle of the oil outlet can be adjusted so that the cooling oil can accurately reach the end bearing 104 or gear. The first oil outlet 402 can be designed as a direct injection structure or a sputtering structure, and the size and position of the first oil outlet 402 can be adjusted according to the ball position of the end bearing 104 or the meshing line position of the gear.

[0061] By controlling the cross-sectional areas of the first oil outlet hole 402, the second oil outlet hole 404, and the second oil channel 502, the flow rate of the cooling oil in each group of oil channels can be reasonably distributed, which ensures that a sufficient amount of cooling oil passes through the interior of the rotor core 203 and that the cooling oil can be sprayed out from the first oil outlet hole 402, so that the rotor core 203 in the middle of the rotor structure and the windings, bearings 104 or gears at the ends can obtain relatively uniform cooling, further ensuring the cooling effect of the entire rotor structure.

[0062] Furthermore, on the same balancing plate 202 , a plurality of the first oil outlet holes 402 and a plurality of the second oil outlet holes 404 are provided and are spaced apart around the circumference of the balancing plate 202 , and the first oil outlet holes 402 and the second oil outlet holes 404 are arranged alternately.

[0063] Figure 5 The figure shows that three first oil outlet holes 402 and three second oil outlet holes 404 are arranged on each balancing plate 202. The first oil outlet holes 402 and the second oil outlet holes 404 are arranged at intervals around the circumference of the balancing plate 202, and the first oil outlet holes 402 and the second oil outlet holes 404 are arranged in a staggered and evenly spaced manner. The advantage of such an arrangement is that the structures of the balancing plates 202 at the left and right ends are completely identical, and the processing is very convenient, which is conducive to saving production costs. During assembly, it is only necessary to make the first oil outlet hole 402 on one end of the balancing plate 202 face the second oil outlet hole 404 on the other end of the balancing plate 202. Specifically, the first oil outlet hole 402 on the left end balancing plate 202 faces the second oil outlet hole 404 on the right end balancing plate 202, and the first oil outlet hole 402 on the right end balancing plate 202 faces the second oil outlet hole 404 on the left end balancing plate 202, so that the first oil outlet hole 402 and the second oil outlet hole 404 are respectively connected to the two ends of the second oil passage 502 to form an oil passage.

[0064] Furthermore, a first oil groove 401 is provided on one side of the balance plate 202 close to the rotor core 203, the first oil outlet hole 402 is provided in the first oil groove 401, the first oil groove 401 is connected to the first oil inlet hole 302 or the second oil inlet hole 303, and the first oil groove 401 is connected to the second oil channel 502.

[0065] Specifically, the first oil groove 401 is provided on the side where the balance plate 202 and the end of the rotor core 203 are attached, and the shape can be set to be a long strip. When the cooling oil flows out from the first oil inlet hole 302 or the second oil inlet hole 303, the cooling oil will first enter the first oil groove 401, and the first oil groove 401 is connected to the first oil outlet hole 402 so that the oil can flow into the first oil outlet hole 402. At the same time, the first oil groove 401 has a larger cross-sectional area than the first oil outlet hole 402, which increases the cooling cross section of the rotor core 203 and the balance plate 202, and further improves the cooling effect.

[0066] Furthermore, the first oil inlet hole 302 and the second oil inlet hole 303 are both arranged along the radial direction of the rotating shaft 201 , and the first oil groove 401 is arranged along the radial direction of the balancing plate 202 .

[0067] See also Figure 2 The first oil inlet hole 302 and the second oil inlet hole 303 are both arranged along the radial direction of the rotating shaft 201, and are respectively located close to the two ends of the rotor core 203; the first oil groove 401 is arranged along the radial direction of the balance plate 202, is located between the balance plate 202 and the rotor core 203, and is communicated with the first oil inlet hole 302 or the second oil inlet hole 303. When the cooling oil flows into the first oil groove 401 from the first oil inlet hole 302 or the second oil inlet hole 303, the oil in the first oil groove 401 can cool down the fitting part between the rotor core 203 and the balance plate 202.

[0068] Furthermore, a second oil groove 403 is provided on one side of the balancing plate 202 close to the rotor core 203 , the second oil outlet hole 404 is provided in the second oil groove 403 , and the second oil groove 403 is communicated with the second oil passage 502 .

[0069] Specifically, the second oil groove 403 is provided on the side where the balance plate 202 and the end of the rotor core 203 are attached, and the shape can be set to be a long strip. When the cooling oil flows from the second oil channel 502 to the second oil outlet 404, the cooling oil will first enter the second oil groove 403. The second oil groove 403 has a larger cross-sectional area than the second oil channel 502, which increases the cooling cross section of the rotor core 203 and the balance plate 202, and further improves the cooling effect.

[0070] In practical applications, in order to facilitate processing and production, the second oil groove 403 and the first oil groove 401 can adopt exactly the same structure.

[0071] Furthermore, the rotor core 203 includes a plurality of punching sheets, each of which is provided with an oil hole 501 , and the plurality of punching sheets are overlapped so that the oil holes 501 are connected to form the second oil passage 502 .

[0072] Specifically, the rotor core 203 is formed by stacking a plurality of punching sheets, on which a plurality of groups of magnetic steels 204 are arranged, and the oil holes 501 are arranged between two adjacent groups of magnetic steels 204, avoiding the positions where the magnetic steels 204 are located, so as not to damage the magnetic circuit. The shape of the oil holes 501 can be circular, or elliptical, polygonal or other suitable shapes. After the punching sheets are stacked, the oil holes 501 at corresponding positions on all the punching sheets are connected to form a second oil passage 502, and the second oil passage 502 is arranged along the axial direction of the rotor core 203.

[0073] The number of oil holes 501 on each punching plate can be set according to the number of rotor pole pairs. Figure 6 The figure shows the situation of six oil holes 501. The six oil holes 501 are evenly distributed along the circumference of the punching sheet. The corresponding rotor core 203 has six second oil channels 502, and the six second oil channels 502 are evenly distributed around the circumference of the rotor core 203. When the cooling oil flows through each second oil channel 502, uniform heat exchange with the rotor core 203 can be achieved, thereby taking away the heat of the rotor core 203 and reducing the temperature of the magnetic steel 204.

[0074] The sum of the number of the first oil inlet holes 302 and the second oil inlet holes 303 on the rotating shaft 201 and the sum of the number of the first oil outlet holes 402 and the second oil outlet holes 404 on each balance plate 202 correspond to the number of second oil passages 502. In the case of setting six second oil passages 502, three first oil inlet holes 302 and three second oil inlet holes 303 are set on the rotating shaft 201, and three first oil outlet holes 402 and three second oil outlet holes 404 are set on each balance plate 202.

[0075] like Figure 2 As shown, in this embodiment, the cooling path of the cooling oil is as follows:

[0076] In the first oil circuit, the cooling oil flows along the first oil passage 301 inside the rotating shaft 201 through the first oil inlet hole 302 at the left end of the rotating shaft 201, enters the first oil groove 401 on the left end balance plate 202, cools the contact surface between the rotor core 203 and the left end balance plate 202, then enters the first oil outlet hole 402 on the left end balance plate 202 through the first oil groove 401, and is sprayed out through the first oil outlet hole 402 to cool the left end bearing 104 or gear;

[0077] In the second oil circuit, the cooling oil flows along the first oil passage 301 inside the rotating shaft 201 through the first oil inlet hole 302 at the left end of the rotating shaft 201, enters the first oil groove 401 on the left end balance plate 202, cools the fitting surface between the rotor core 203 and the left end balance plate 202, then enters the second oil passage 502 inside the rotor core 203, cools the rotor core 203 during the flow along the second oil passage 502, then reaches the second oil groove 403 on the right end balance plate 202, cools the fitting surface between the rotor core 203 and the right end balance plate 202, and finally is thrown out through the second oil outlet hole 404 on the right end balance plate 202 to cool the inner ring at the right end of the stator winding;

[0078] In the third oil circuit, the cooling oil flows along the first oil passage 301 inside the rotating shaft 201 to the second oil inlet hole 303 at the right end of the rotating shaft 201, enters the first oil groove 401 on the right end balance plate 202 through the second oil inlet hole 303, cools the contact surface between the rotor core 203 and the right end balance plate 202, and finally sprays out through the first oil outlet hole 402 on the right end balance plate 202 to cool the right end bearing 104 or the gear;

[0079] In the fourth oil circuit, the cooling oil flows along the first oil channel 301 inside the rotating shaft 201 to the second oil inlet hole 303 at the right end of the rotating shaft 201, enters the first oil groove 401 on the right end balance plate 202 through the second oil inlet hole 303, cools the fitting surface between the rotor core 203 and the right end balance plate 202, and then enters the second oil channel 502 inside the rotor core 203, cools the rotor core 203 while flowing along the second oil channel 502, and then reaches the second oil groove 403 on the left end balance plate 202, cools the fitting surface between the rotor core 203 and the left end balance plate 202, and finally is thrown out through the second oil outlet hole 404 on the left end balance plate 202 to cool the inner ring at the left end of the stator winding.

[0080] Among the above four groups of oil circuits, the second oil circuit and the fourth oil circuit can realize oil flow into the rotor core 203 from both ends of the rotor core 203, respectively, to realize cooling of the rotor core 203; the first oil circuit and the third oil circuit do not pass through the rotor core 203, but directly lead the cooling oil inside the shaft 201 to both ends of the shaft 201, so as to cool the bearings at both ends of the rotor structure. The oil-cooled motor rotor assembly provided in the embodiment of the present application can not only efficiently cool the bearings 104 and windings at both ends of the rotor structure, but also effectively cool the rotor core 203 in the middle of the rotor structure, thereby preventing the magnet 204 from overheating and demagnetizing, improving the cooling effect of the rotor structure as a whole, and ensuring the reliability of the motor.

[0081] An embodiment of the present application further provides a motor, comprising the oil-cooled motor rotor assembly as described above.

[0082] See also Figure 7 The motor further comprises a housing 101 and a stator assembly 103 fixed inside the housing 101. The housing 101 and the stator assembly 103 have stator cooling oil circuits. The stator cooling method adopts the existing technology and is not described here. The rotor assembly 102 is installed in the housing 101 through bearings 104 at both ends.

[0083] When the motor is running, the bearings 104 at both ends of the shaft can be effectively cooled, and the motor has higher reliability than the prior art.

[0084] An embodiment of the present application further provides a vehicle, comprising the oil-cooled motor rotor assembly as described above or the motor as described above.

[0085] The advantages of the vehicle and the above-mentioned oil-cooled motor rotor assembly over the prior art are the same and will not be described in detail here.

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An oil-cooled motor rotor assembly, comprising a rotating shaft (201), a rotor core (203) sleeved on the rotating shaft (201), and two balancing plates (202) connected to both ends of the rotor core (203), characterized in that: A first oil passage (301) is axially arranged inside the rotating shaft (201), a first oil inlet hole (302) is arranged on the first oil passage (301), and the first oil inlet hole (302) is located at one end of the rotor core (203); The balancing plate (202) is provided with a first oil outlet hole (402), the first oil outlet hole (402) being arranged through two end surfaces of the balancing plate (202), and the output end of the first oil inlet hole (302) is connected to the input end of the first oil outlet hole (402) close to one end of the first oil inlet hole (302).

2. The oil-cooled motor rotor assembly according to claim 1, characterized in that: The first oil passage (301) is also provided with a second oil inlet hole (303), the second oil inlet hole (303) is located at an end of the rotor core (203) away from the first oil inlet hole (302), and the first oil inlet hole (302) and the second oil inlet hole (303) are not on the same straight line; The output end of the second oil inlet hole (303) is in communication with the input end of the first oil outlet hole (402) close to one end of the second oil inlet hole (303).

3. The oil-cooled motor rotor assembly according to claim 2, characterized in that: The balancing plate (202) is also provided with a second oil outlet hole (404), and the second oil outlet hole (404) is provided through two end surfaces of the balancing plate (202); A plurality of second oil passages (502) are axially arranged inside the rotor core (203); an input end of the second oil passage (502) is connected to the first oil outlet hole (402) on the first balance plate of the two balance plates (202); and an output end of the second oil passage (502) is connected to the second oil outlet hole (404) on the second balance plate of the two balance plates (202).

4. The oil-cooled motor rotor assembly according to claim 3, characterized in that: The cross-sectional area of ​​the first oil outlet hole (402) is smaller than the cross-sectional area of ​​the second oil outlet hole (404), and the cross-sectional area of ​​the second oil outlet hole (404) is smaller than the cross-sectional area of ​​the second oil passage (502).

5. The oil-cooled motor rotor assembly according to claim 3, characterized in that: On the same balancing plate (202), a plurality of the first oil outlet holes (402) and a plurality of the second oil outlet holes (404) are provided and are spaced apart around the circumference of the balancing plate (202), and the first oil outlet holes (402) and the second oil outlet holes (404) are arranged in an alternating manner.

6. The oil-cooled motor rotor assembly according to claim 3, characterized in that: A first oil groove (401) is provided on one side of the balancing plate (202) close to the rotor core (203); the first oil outlet hole (402) is provided in the first oil groove (401); the first oil groove (401) is communicated with the first oil inlet hole (302) or the second oil inlet hole (303); and the first oil groove (401) is communicated with the second oil passage (502).

7. The oil-cooled motor rotor assembly according to claim 6, characterized in that: The first oil inlet hole (302) and the second oil inlet hole (303) are both arranged along the radial direction of the rotating shaft (201), and the first oil groove (401) is arranged along the radial direction of the balancing plate (202).

8. The oil-cooled motor rotor assembly according to claim 6, characterized in that: A second oil groove (403) is also provided on one side of the balancing plate (202) close to the rotor core (203); the second oil outlet hole (404) is provided in the second oil groove (403); and the second oil groove (403) is connected to the second oil channel (502).

9. A motor, comprising the oil-cooled motor rotor assembly according to any one of claims 1 to 8.

10. A vehicle, comprising the oil-cooled motor rotor assembly according to any one of claims 1 to 8, or comprising the motor according to claim 9.

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