Motor rotor, drive motor, new energy vehicle

Abstract

The present invention provides a motor rotor, a drive motor and a new energy vehicle. A motor rotor includes an iron core and a rotor shaft arranged at the center axis of the iron core. A plurality of oil inlet holes are opened on the peripheral wall of the rotor shaft. The iron core includes: a first rotor punching sheet, on which a plurality of oil holes are formed; a second rotor punching sheet, which has an oil outlet hole arranged corresponding to the oil hole and connected to the edge of the second rotor punching sheet; wherein a plurality of the first rotor punching sheets and the second rotor punching sheets are stacked together in a manner that the oil holes and the oil outlet holes are opposite to each other, so as to form a plurality of oil channels distributed inside the iron core, and the coolant flows in the oil channels through the oil inlet holes. In the present invention, the oil channel is implemented inside the iron core to realize cooling of the inside of the iron core, so as to solve the problem of uneven cooling of the overall iron core caused by the inability to cool the inside of the iron core, which affects the service life of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a motor rotor, a drive motor, and a new energy vehicle. Background Art

[0002] At present, during the actual operation of the main drive motor of new energy vehicles, when the vehicle is in a low-speed and high-torque state, the rotor of the main drive motor will generate a large amount of heat due to increased power consumption. If the large amount of heat generated is not dissipated in time, it will have a great impact on the performance and life of the motor.

[0003] At present, the heat dissipation method of the main drive motor rotor of new energy vehicles is mostly to directly spray coolant onto the outer surface of the rotor core and the magnetic steel, thereby achieving the cooling effect of the rotor core. This cooling method has limited overall cooling effect on the core and the magnetic steel per unit time and low cooling efficiency because the coolant cannot enter the interior of the core and the magnetic steel.

[0004] In order to solve the above problems, in the prior art, the coolant is introduced into the rotor shaft, an oil hole is arranged on the peripheral wall of the rotor shaft, a first oil circuit perpendicular to the axial direction is arranged on the two axial end faces of the iron core, and a second oil circuit connected to the first oil circuit and parallel to the axial direction is arranged. Under the action of centrifugal force, the coolant enters the above oil circuit through the oil hole to achieve cooling of the iron core and the magnetic steel.

[0005] However, in the above technical solution, although the rotor shaft is arranged inside the iron core, and the coolant passing through it can play a certain cooling effect on the inner surface of the iron core, most of the area between the outer surface and the inner surface of the iron core still cannot obtain the cooling effect equivalent to that of the outer surface. It is easy to form a situation where the cooling effect on the inner surface, outer surface and two shaft end faces of the iron core is better, and the cooling effect in the middle area gradually decreases, which leads to uneven distribution of hot and cold inside the iron core and formation of local heat islands. The uneven heating of the iron core will greatly affect the service life of its material, and thus affect the working performance of the motor. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect of uneven cooling inside the rotor core of the motor in the prior art, thereby providing a motor rotor, a drive motor, and a new energy vehicle.

[0007] In order to solve the above problems, the present invention provides a motor rotor, including an iron core and a rotor shaft arranged at the center axis of the iron core, a plurality of oil inlet holes are opened on the peripheral wall of the rotor shaft, and the iron core includes: a first rotor punching sheet, on which a plurality of oil holes are formed; a second rotor punching sheet, having an oil outlet hole arranged corresponding to the oil holes and connected to the edge of the second rotor punching sheet; wherein, a plurality of the first rotor punching sheets and the second rotor punching sheets are stacked together in a manner that the oil holes and the oil outlet holes are opposite to each other, so as to form a plurality of oil channels distributed inside the iron core, and the coolant flows in the oil channels through the oil inlet holes.

[0008] Furthermore, the oil holes and / or the oil outlet holes are distributed at equal intervals along the same circumference.

[0009] Furthermore, the oil through hole and the oil outlet hole are respectively arranged close to the radial middle position of the first rotor punching sheet and the second rotor punching sheet.

[0010] Furthermore, the oil outlet hole has an oil passing portion and an oil outlet portion connecting the oil passing portion and an edge of the second rotor punching sheet, and the oil passing portion and the oil passing hole are arranged opposite to each other.

[0011] Furthermore, the oil outlet hole and the oil outlet portion are constructed to have the same cross-sectional shape.

[0012] Furthermore, the oil outlet hole and the oil outlet portion are constructed to be one or more of a circular, quasi-circular, and polygonal shape.

[0013] Furthermore, it also includes a rotor baffle, and two rotor baffles are respectively arranged on the axial end surfaces of the iron core.

[0014] Furthermore, a groove is provided on the end surface of the rotor baffle facing the iron core, and a plurality of flow channels are provided at the bottom of the groove, and the coolant flows from the oil inlet hole through the flow channels and enters the oil passage hole.

[0015] Furthermore, a through hole is provided at the center of the rotor baffle, and the rotor shaft is connected to the through hole and is provided on the rotor baffle.

[0016] Furthermore, a plurality of notches are provided on the edge of the through hole, the notches are provided corresponding to the oil inlet, and one end of the flow channel is connected to the oil inlet via the notches.

[0017] Furthermore, a plurality of the flow channels are radially distributed along the radial direction of the rotor baffle.

[0018] Furthermore, a blind hole structure is constructed from the shaft end of the rotor shaft along the axial direction, and a jet surface is formed at the bottom of the blind hole.

[0019] Furthermore, the rotor shaft is constructed with two blind hole structures along the axial direction.

[0020] Furthermore, the jet surface is constructed as a curved surface that bends along the jet direction.

[0021] Furthermore, a plurality of oil guide grooves are provided on the inner peripheral surface of the blind hole along the curvature direction of the jet surface, and the oil guide grooves are connected to the oil inlet hole.

[0022] A driving motor comprises: any one of the motor rotors described above.

[0023] A new energy vehicle comprises the drive motor mentioned above.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The motor rotor in the present invention comprises an iron core and a rotor shaft arranged at the center axis of the iron core, a plurality of oil inlet holes are opened on the peripheral wall of the rotor shaft, and the iron core comprises: a first rotor punching sheet, on which a plurality of oil holes are formed; a second rotor punching sheet, having an oil outlet hole arranged corresponding to the oil holes and connected to the edge of the second rotor punching sheet; wherein a plurality of the first rotor punching sheets and the second rotor punching sheets are stacked together in a manner that the oil holes and the oil outlet holes are opposite to each other, so as to form a plurality of oil channels distributed inside the iron core, and the coolant flows into the oil channels through the oil inlet holes.

[0026] In the present invention, the first rotor punching and the second rotor punching are superimposed in a manner in which the oil hole and the oil outlet hole are aligned, wherein a plurality of the first rotor punchings and the second rotor punchings constitute the core part, and the oil outlet holes and the oil hole constitute the oil channel part formed inside the core. Compared with the prior art in which the oil channel is only arranged on the two end surfaces and the outer peripheral surface of the core, the present application can further implement the oil channel inside the core to achieve cooling of the inside of the core, so as to solve the problem of uneven cooling of the overall core caused by the inability to cool the inside of the core, thereby affecting the service life of the motor.

[0027] 2. The oil holes and / or the oil outlet holes in the motor rotor of the present invention are evenly spaced along the same circumference to achieve that the oil passages formed after superposition are all located at the same position in the radial direction of the iron core, and at this radial position, the formed oil passages are evenly distributed relative to the center axis of the iron core to ensure that the coolant flows evenly inside the iron core, further avoiding uneven cooling caused by uneven distribution of the coolant.

[0028] 3. The oil through hole and the oil outlet hole in the motor rotor of the present invention are respectively arranged close to the radial middle position of the first rotor punching sheet and the second rotor punching sheet, so that the flow channel formed by superposition is distributed in the radial middle position of the iron core, and then a cooling system is formed in the radial direction of the iron core in sequence, including cooling at the inside of the rotor shaft, cooling at the radial center of the iron core and cooling at the outer peripheral surface of the iron core, which satisfies the problem of cooling uniformity in the radial direction of the iron core.

[0029] 4. The oil outlet hole in the motor rotor in the present invention has an oil passing portion and an oil outlet portion connecting the oil passing portion and the edge of the second rotor punching sheet. The oil passing portion and the oil passing hole are arranged opposite to each other. After superposition, the oil outlet portion can form an oil path connected to the outside along the radial direction of the iron core. The oil path is distributed along the axial direction, which can meet the problem of uniform cooling of the iron core in the axial direction.

[0030] 5. The oil outlet hole and the oil outlet portion in the motor rotor of the present invention are constructed to have the same cross-sectional shape. The same cross-sectional shape can be constructed into a smooth flow channel, which is conducive to the flow of the coolant.

[0031] 6. In the motor rotor of the present invention, a groove is provided on the end face of the rotor baffle facing the iron core, and a plurality of flow channels are provided at the bottom of the groove. The coolant flows from the oil inlet through the flow channel into the oil hole, and the above-mentioned flow channel and the two end faces of the iron core form oil paths distributed at the two end faces of the iron core to achieve cooling effect on the end faces. On the other hand, the formation process of the iron core in the present invention determines that the oil passage openings of the oil channels inside the iron core are distributed at the end faces of the iron core. The design of the flow channel facilitates the better introduction of the coolant coming out of the rotor shaft into the internal oil channel of the iron core, thereby improving the cooling efficiency.

[0032] 7. A plurality of notches are provided at the edge of the through hole in the motor rotor of the present invention, and the notches are provided corresponding to the oil inlet. One end of the flow channel is connected with the oil inlet through the notches. The setting of the notches ensures the smoothness of the connection between the flow channel and the oil inlet, so that the flow of the coolant is not hindered, thereby improving the flow capacity of the coolant and improving the cooling effect.

[0033] 8. In the motor rotor of the present invention, several flow channels are radially distributed along the radial direction of the rotor baffle, so that the flow channels are straight flow channels. The resistance encountered by the liquid flowing in the straight flow channels is small, and the radial distribution achieves a better coverage effect on the end face of the core, thereby improving the cooling efficiency.

[0034] 9. The rotor shaft of the motor rotor in the present invention is constructed with a blind hole structure starting from the shaft end along the axial direction, and a jet surface is formed at the bottom of the blind hole. The coolant provided by the oil pump is sprayed into the blind hole of the rotor shaft and impacts on the above-mentioned jet surface. The jet surface has a drainage effect, which can drain as much coolant as possible to the oil inlet hole, thereby improving the liquid supply efficiency of the oil circuit.

[0035] 10. In the motor rotor of the present invention, the rotor shaft is constructed with two blind hole structures along the axial direction, so that coolant can be supplied from both ends of the rotor shaft, thereby accelerating the efficiency of coolant entering the oil circuit.

[0036] 11. In the motor rotor of the present invention, the inner circumference of the blind hole is provided with a plurality of oil guide grooves along the curvature direction of the jet surface, and the oil guide grooves are connected to the oil inlet holes. When the coolant is sprayed onto the jet surface, it will flow down along the jet surface, but the oil inlet holes are distributed at intervals, so that the coolant flowing down cannot flow into the oil inlet holes in the interval parts. The oil guide grooves can collect the coolant in the corresponding interval parts and guide them together into the oil inlet holes, thereby improving the liquid inlet efficiency and cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the structure of the motor rotor in Embodiment 1 provided by the present invention;

[0039] Figure 2 A schematic structural diagram of the first rotor punching sheet in Embodiment 1 provided by the present invention;

[0040] Figure 3 A schematic diagram of the structure of the second rotor punching sheet in Embodiment 1 provided by the present invention;

[0041] Figure 4 A schematic structural diagram of the iron core in Embodiment 1 provided by the present invention;

[0042] Figure 5 A schematic diagram of the structure of the rotor end cover in Example 1 provided by the present invention;

[0043] Figure 6 A cross-sectional view of the iron core in Embodiment 1 provided by the present invention;

[0044] Figure 7A schematic diagram of the structure of the rotor shaft in Embodiment 1 provided by the present invention;

[0045] Figure 8 This is a schematic diagram of the flow direction of the coolant in Example 1 provided by the present invention.

[0046] Description of reference numerals:

[0047] 1- iron core; 11- first rotor punching plate; 111- oil hole; 12- second rotor punching plate; 121- oil outlet hole; 1211- oil passing part; 1212- oil outlet part;

[0048] 2-rotor shaft; 21-oil inlet hole; 22-blind hole; 23-jet surface; 24-oil guide groove;

[0049] 3-rotor end cover; 31-flow channel. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Example 1

[0055] like Figures 1 to 8 As shown, a motor rotor provided in this embodiment includes an iron core 1 and a rotor shaft 2 arranged at the center axis of the iron core 1, and a plurality of oil inlet holes 21 are opened on the peripheral wall of the rotor shaft 2. The iron core 1 includes: a first rotor punching 11, on which a plurality of oil holes 111 are formed; a second rotor punching 12, having an oil outlet hole 121 arranged corresponding to the oil hole 111 and connected to the edge of the second rotor punching 12; wherein, a plurality of first rotor punchings 11 and second rotor punchings 12 are superimposed on each other in a manner that the oil holes 111 and the oil outlet holes 121 are opposite to each other, so as to form a plurality of oil channels distributed inside the iron core 1, and the coolant flows in the oil channels through the oil inlet holes 21.

[0056] The present embodiment provides a rotor structure of a permanent magnet AC motor, wherein a first rotor punching 11 and a second rotor punching 12 are stacked in a manner of aligning an oil hole 111 and an oil outlet hole 121, wherein a plurality of first rotor punchings 11 and a second rotor punching 12 constitute a core 1 portion, and the oil outlet holes 121 and the oil holes 111 constitute an oil channel portion formed inside the core 1. Compared with the prior art in which the oil channel is only arranged on the two end surfaces and the outer peripheral surface of the core 1, the oil channel can be further implemented inside the core 1 in the present embodiment to achieve cooling of the inside of the core 1, so as to solve the problem of uneven cooling of the overall core 1 due to the inability to cool the inside of the core 1, thereby affecting the service life of the motor.

[0057] The first rotor punching sheet 11 and the second rotor punching sheet 12 in the present embodiment are both punched from 0.3 mm thick silicon steel sheets and then formed into the iron core 1 in the present embodiment through a lamination process.

[0058] The first rotor punching sheet 11 and the second rotor punching sheet 12 are provided with through holes in the middle thereof for the rotor shaft 2 to pass through, so as to realize the installation of the rotor shaft 2 .

[0059] The stacking method of the first rotor punching sheet 11 and the second rotor punching sheet 12 in this embodiment is specifically described below:

[0060] As mentioned above, the thickness of the punching sheet is very thin, which is 0.3 mm. In order to form a flow channel with a certain length, it is necessary to first stack a number of first rotor punching sheets 11 together, such as thirty sheets, and stack a number of second rotor punching sheets 12 together, such as 10 sheets, and then stack the stacked first rotor punching sheets 11 and second rotor punching sheets 12 as separate entities. In this way, different numbers of punching sheet stacking methods can obtain oil channels with different arrangement densities, corresponding to different types of motor rotor structures, and realize adjustable cooling methods.

[0061] Regarding the oil outlet hole 121, Figure 3As shown, it has an oil passing portion 1211 and an oil outlet portion 1212 connecting the oil passing portion 1211 and the edge of the second rotor punching sheet 12. In this embodiment, the oil passing portion 1211 is arranged opposite to the oil passing hole 111. After being superimposed, the above-mentioned oil outlet portion 1212 can form an oil path connected to the outside along the radial direction of the iron core 1. The above-mentioned oil path is distributed along the axial direction, which can meet the problem of cooling uniformity of the iron core 1 in the axial direction.

[0062] like Figure 2 and Figure 3 As shown, the oil holes 111 and the oil outlet holes 121 in this embodiment are evenly spaced along the same circumference to realize that the oil passages formed after superposition are all located at the same position in the radial direction of the core 1, and at this radial position, the formed oil passages are evenly distributed relative to the center axis of the core 1 to ensure that the coolant flows evenly inside the core 1, further avoiding the uneven cooling phenomenon caused by uneven distribution of the coolant.

[0063] In some other embodiments, the oil holes 111 and the oil outlet holes 121 are distributed at unequal intervals along the same circumference.

[0064] In some other embodiments, the oil holes 111 and the oil outlet holes 121 may also be distributed on different circumferences. For example, two adjacent oil holes 11 on the same first rotor punching sheet 11 are distributed on circumferences of different radii, and corresponding oil holes 121 of corresponding oil outlet holes 121 are set. This method can meet the requirement that the oil channels are distributed at different depths in the radial direction of the iron core 1, which can improve the cooling effect of the iron core 1 to a certain extent.

[0065] Furthermore, the oil hole 111 and the oil outlet hole 121 are respectively arranged near the radial middle position of the first rotor punching 11 and the second rotor punching 12, so that the oil channels formed by superposition are distributed in the radial middle position of the core 1, and then a cooling system is formed in the radial direction of the core 1, which includes cooling inside the rotor shaft 2, cooling at the radial center of the core 1 and cooling on the outer peripheral surface of the core 1, thereby satisfying the problem of cooling uniformity in the radial direction of the core 1.

[0066] like Figure 2 and Figure 3 As shown, the oil outlet hole 121 and the oil outlet portion 1212 in this embodiment are constructed with the same cross-sectional shape, both of which are circular. The same cross-sectional shape can be constructed into a smooth flow channel, which is conducive to the flow of coolant, and the tube wall of the circular oil channel has less resistance to the flow of fluid, resulting in better effect.

[0067] Of course, in some other embodiments, the oil outlet hole 121 and the oil outlet portion 1212 may also be constructed as one or more of a quasi-circular or polygonal shape.

[0068] like Figure 5As shown, this embodiment also includes a rotor baffle 3, and two rotor baffles 3 are respectively arranged on the axial end faces of the core 1. A groove is processed on the end face of the rotor baffle 3 facing the core 1, and a plurality of flow channels 31 are processed on the bottom of the groove. The coolant flows from the oil inlet hole 21 through the flow channel 31 and enters the oil hole 111. The above-mentioned flow channel 31 and the two end faces of the core 1 form an oil path distributed at the two end faces of the core 1 to achieve cooling of the end faces. On the other hand, the formation process of the core 1 in this embodiment determines that the oil passage 111 of the oil channel inside the core 1 is distributed at the end face of the core 1. The design of the flow channel 31 facilitates the better introduction of the coolant coming out of the rotor shaft 2 into the internal oil channel of the core 1, thereby improving the cooling efficiency.

[0069] Furthermore, a through hole is processed at the center of the rotor baffle 3, and the rotor shaft 2 is connected to the through hole and arranged on the rotor baffle 3. A shaft step is formed on one side of the rotor shaft 2 near the outer end surface of the rotor baffle 3, and the shaft step is used for positioning and installing the rotor shaft 2 on the through hole.

[0070] A plurality of notches are processed on the edge of the through hole, and the notches are arranged corresponding to the oil inlet 21. One end of the flow channel 31 is connected with the oil inlet 21 through the notches. The setting of the notches ensures the smoothness of the connection between the flow channel 31 and the oil inlet 21, so that the flow of the coolant is not hindered, thereby improving the flow capacity of the coolant and improving the cooling effect.

[0071] like Figure 5 As shown, in this embodiment, eight flow channels 31 are radially distributed along the radial direction of the rotor baffle 3. The flow channel 31 is a straight flow channel, and the resistance encountered by the liquid in the straight flow channel is small, and the radial distribution achieves a good coverage effect on the end surface of the core 1 to improve the cooling efficiency.

[0072] The rotor shaft 2 is constructed with a blind hole 22 structure along the axial direction starting from the shaft end, and a jet surface 23 is formed at the bottom of the blind hole 22. The coolant provided by the oil pump is sprayed into the blind hole 22 of the rotor shaft 2 and hits the jet surface 23. The jet surface 23 has a drainage function, which can drain as much coolant as possible to the oil inlet hole, thereby improving the liquid supply efficiency of the oil circuit.

[0073] like Figure 7 As shown, in this embodiment, the rotor shaft 2 is constructed with two blind holes 22 along the axial direction, so that coolant can be supplied from both ends of the rotor shaft 2, thereby accelerating the efficiency of coolant entering the oil circuit. Furthermore, the jet surface 23 is constructed as a curved surface that bends along the jet direction.

[0074] In this embodiment, the inner circumference of the blind hole 22 is processed with a plurality of oil guide grooves 24 along the curvature direction of the jet surface 23, and the oil guide grooves 24 are connected to the oil inlet hole 21. When the coolant is sprayed onto the jet surface 23, it will flow down along the jet surface 23, but the oil inlet holes 21 are distributed at intervals, so that the coolant flowing down cannot flow into the oil inlet holes 21 in the interval part. The oil guide grooves 24 can collect the coolant in the corresponding interval part and guide it into the oil inlet hole 21 together, thereby improving the liquid inlet efficiency and cooling effect.

[0075] Example 2

[0076] This embodiment provides a driving motor, including the motor rotor described in the above-mentioned embodiment 1 and having all its technical advantages, which will not be described one by one here.

[0077] Example 3

[0078] This embodiment provides a new energy vehicle, including the drive motor in Embodiment 2, and has all its technical advantages, which will not be described one by one here.

[0079] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A motor rotor, comprising an iron core (1) and a rotor shaft (2) arranged at the center axis of the iron core (1), wherein a plurality of oil inlet holes (21) are provided on a peripheral wall of the rotor shaft (2), characterized in that: The iron core (1) comprises: A first rotor punching sheet (11) having a plurality of oil holes (111) formed thereon; A second rotor punching sheet (12) having an oil outlet hole (121) arranged corresponding to the oil through hole (111) and connected to the edge of the second rotor punching sheet (12); wherein a plurality of the first rotor punching sheets (11) and the second rotor punching sheets (12) are stacked together in a manner such that the oil holes (111) and the oil outlet holes (121) are opposite to each other, so as to form a plurality of oil passages distributed inside the iron core (1), and the coolant flows into the oil passages through the oil inlet holes (21); The oil outlet hole (121) comprises an oil passing portion (1211) and an oil outlet portion (1212) connecting the oil passing portion (1211) and the edge of the second rotor punching sheet (12); the oil passing portion (1211) and the oil passing hole (111) are arranged opposite to each other.

2. The motor rotor according to claim 1, characterized in that: The oil holes (111) and / or the oil outlet holes (121) are distributed at equal intervals along the same circumference.

3. The motor rotor according to claim 2, characterized in that: The oil through hole (111) and the oil outlet hole (121) are respectively arranged close to radial middle positions of the first rotor punching sheet (11) and the second rotor punching sheet (12).

4. The motor rotor according to claim 1, characterized in that: The oil outlet hole (121) and the oil outlet portion (1212) are constructed to have the same cross-sectional shape.

5. The motor rotor according to claim 4, characterized in that: The oil outlet hole (121) and the oil outlet portion (1212) are constructed in the shape of a circle, a quasi-circle, or a polygon, or in a combination thereof.

6. The motor rotor according to claim 1, characterized in that: It also comprises a rotor baffle (3), wherein two rotor baffles (3) are respectively arranged on the axial end faces of the iron core (1).

7. The motor rotor according to claim 6, characterized in that: A groove is provided on the end surface of the rotor baffle (3) facing the iron core (1), and a plurality of flow channels (31) are provided at the bottom of the groove. The coolant flows from the oil inlet hole (21) through the flow channels (31) and enters the oil passage hole (111).

8. The motor rotor according to claim 7, characterized in that: A through hole is provided at the center of the rotor baffle (3), and the rotor shaft (2) is connected to the through hole and is provided on the rotor baffle (3).

9. The motor rotor according to claim 8, characterized in that: A plurality of notches are provided at the edge of the through hole, the notches being arranged corresponding to the oil inlet hole (21), and one end of the flow channel (31) is connected to the oil inlet hole (21) via the notches.

10. The motor rotor according to claim 9, characterized in that: The plurality of flow channels (31) are radially distributed along the radial direction of the rotor baffle (3).

11. The motor rotor according to claim 1, characterized in that: The rotor shaft (2) is constructed with a blind hole (22) structure starting from the shaft end along the axial direction, and a jet surface (23) is formed at the bottom of the blind hole (22).

12. The motor rotor according to claim 11, characterized in that: The rotor shaft (2) is constructed with two blind hole (22) structures along the axial direction.

13. The motor rotor according to claim 11 or 12, characterized in that: The jet surface (23) is constructed as a curved surface that bends along the jet direction.

14. The motor rotor according to claim 13, characterized in that: The inner circumferential surface of the blind hole (22) is provided with a plurality of oil guide grooves (24) along the curved direction of the jet surface (23), and the oil guide grooves (24) are connected to the oil inlet hole (21).

15. A driving motor, characterized in that: include: The motor rotor according to any one of claims 1 to 14.

16. A new energy vehicle, characterized in that: include: The drive motor as claimed in claim 15.

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