Motor rotor and motor having the same

Abstract

The application provides a motor rotor and a motor with the same. The motor rotor comprises a rotor shaft, the rotor shaft is a hollow structure, the rotor shaft comprises a large-diameter section and two small-diameter sections, one of the small-diameter sections is connected with a first end of the large-diameter section, and the other small-diameter section is connected with a second end of the large-diameter section; and a plurality of rotor core sections, the plurality of rotor core sections are sleeved on the large-diameter section of the rotor shaft, a plurality of assembly holes are formed in the rotor core sections, the assembly holes are used for passing through assembly pieces to axially assemble the plurality of rotor core sections, a hole edge profile of the assembly hole is composed of a plurality of circular arc sections, and the centers of the circular arc sections are arranged at intervals along the circumferential direction of the rotor core section. When the assembly pieces are matched with different circular arc sections on different rotor core sections, an included angle is formed between the plurality of rotor core sections, the inclined pole angle between the rotor core sections is ensured, the rotor shaft process is simpler, and the manufacturing cost of the rotor shaft is reduced.

Description

Technical Field

[0001] This invention relates to the field of motor design and manufacturing technology, and more specifically, to a motor rotor and a motor having the same rotor. Background Technology

[0002] In commonly used electric drive systems, to eliminate harmonics, the rotor core generally adopts a skewed pole design, meaning that each segment of the core forms a certain angle. To achieve this angle, keyways of corresponding angles are usually required, allowing the core to be assembled by mating with different keyways to ensure the skewed pole angle. In actual manufacturing, numerous high-precision long keyways lead to high machining difficulty and cost, and also result in thicker shaft walls and greater weight. If the machining dimensional accuracy is not high, it will also lead to a larger dynamic balance allowance, resulting in poor rotor shaft manufacturability.

[0003] Current passenger vehicle electric drive system rotors still have the following problems: 1. The speed can mostly only be maintained below 18,000 r / min. Above 18,000 r / min, insufficient bearing cooling leads to low bearing life; poor rotor shaft rigidity results in poor dynamic balance and high noise; insufficient core strength leads to lamination fatigue failure. 2. Most motors use water cooling, with no rotor cooling, resulting in poor heat dissipation and low continuous power. A few products use oil cooling, but the bearing oil circuit design is imperfect. After the oil is thrown out by the rotor, some oil cannot enter the bearing, resulting in oil waste. From the perspective of the entire cooling system, this increases the cooling flow requirement and energy consumption.

[0004] No effective solution has yet been proposed to address the aforementioned technical issues. Summary of the Invention

[0005] The main objective of this invention is to provide a motor rotor and a motor having the same, so as to solve the problem of high difficulty in machining rotor shafts in the prior art.

[0006] To achieve the above objectives, according to one aspect of the present invention, an electric motor rotor is provided, comprising: a rotor shaft, the rotor shaft having a hollow structure, the rotor shaft including a large-diameter section and a small-diameter section, the small-diameter section being two in number, one of the small-diameter sections being connected to a first end of the large-diameter section, and the other small-diameter section being connected to a second end of the large-diameter section; and a rotor core section, the rotor core section being multiple in number, the multiple rotor core sections being sleeved on the large-diameter section of the rotor shaft, the rotor core sections having multiple assembly holes for assemblies to pass through, for axial assembly of the multiple rotor core sections, the edge profile of the assembly holes being composed of multiple arc segments, the centers of each arc segment being spaced apart along the circumference of the rotor core section.

[0007] Further, the assembly hole includes: a first arc-shaped segment, the line connecting the center of the first arc-shaped segment and the center of the rotor core segment is on a first straight line; a second arc-shaped segment, the line connecting the center of the second arc-shaped segment and the center of the rotor core segment is on a second straight line; and a third arc-shaped segment, of which there are two, the two third arc-shaped segments are arranged opposite each other and located between the first arc-shaped segment and the second arc-shaped segment, the centers of the two third arc-shaped segments are the same, and the line connecting the center of the third arc-shaped segment and the center of the rotor core segment is on a third straight line; the first straight line and the third straight line have a first included angle, and the second straight line and the third straight line have a second included angle; the assembly part is abutted against any one of the first arc-shaped segment, the second arc-shaped segment, and the third arc-shaped segment.

[0008] Furthermore, the first included angle and the second included angle are set to be equal.

[0009] Furthermore, one end of the rotor shaft is provided with an oil inlet for introducing cooling oil. The rotor shaft is provided with multiple oil outlet holes. The motor rotor also includes an oil guide pipe, which is disposed inside the rotor shaft. One end of the oil guide pipe is connected to the oil inlet of the rotor shaft, and the oil guide pipe is provided with at least one oil slinger hole.

[0010] Furthermore, the large-diameter section and the small-diameter section are connected by a transition section. The cross-section of the transition section is an inclined plane. A stepped surface is provided between the transition section and the small-diameter section. The motor rotor also includes: a bearing, which is sleeved on the small-diameter section and the first end of the bearing abuts against the stepped surface; and an oil guide ring, which is connected to the outer surface of the small-diameter section and at least part of the oil guide ring abuts against the second end of the bearing.

[0011] Furthermore, there are two oil slinger holes, which are located on the oil guide pipe within the small diameter section and are symmetrically arranged about the geometric center of the oil guide pipe.

[0012] Furthermore, the oil outlet includes a first oil outlet, and there are two first oil outlets. The first oil outlets are symmetrically arranged about the geometric center line of the rotor shaft, and the hole wall of the first oil outlet near the large diameter section is flush with the end face of the second end of the bearing.

[0013] Furthermore, the oil guide ring includes: an annular body, the inner wall of the annular body being connected to the outer surface of the small diameter section, and at least one oil guide groove being provided at one end of the annular body facing the bearing. The oil guide groove extends along the inner wall of the annular body to the outer wall of the annular body, and the groove wall of the oil guide groove is provided at a distance from the outer wall of the annular body.

[0014] Furthermore, the geometric center line of the first oil outlet hole and the geometric center line of the oil slinger hole are located on the same cross section of the rotor shaft in the axial direction, and the geometric center line of the first oil outlet hole and the geometric center line of the oil slinger hole are set at an angle in the cross section.

[0015] Furthermore, the oil outlet includes a second oil outlet, and there are multiple second oil outlets, which are opened at the connection between the large-diameter section and the transition section.

[0016] According to another aspect of the present invention, an electric motor is provided, the electric motor having a motor rotor and a motor stator, wherein the motor rotor is the motor rotor described above.

[0017] By applying the technical solution of this invention, multiple assembly holes are opened on the rotor core segment. The edge profile of the assembly holes is composed of multiple arc segments, and the centers of each arc segment are spaced apart along the circumference of the rotor core segment. This allows multiple rotor core segments to form an included angle when the assembly parts mate with different arc segments on different rotor core segments, thereby ensuring the skew angle between the rotor cores. Compared with the prior art design of opening keyways and keys on the rotor core and rotor shaft, this solution eliminates the keyway design, eliminating the need for keyway or key processing on the rotor shaft. This simplifies the rotor shaft process, reduces the manufacturing cost of the rotor shaft, and also allows the rotor shaft to have better rigidity, thereby increasing the motor speed and obtaining better performance. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A schematic diagram of an embodiment of a motor rotor according to the present invention is shown;

[0020] Figure 2 A schematic diagram of the structure of a first embodiment of the rotor shaft according to the present invention is shown;

[0021] Figure 3 A schematic diagram of a second embodiment of the rotor shaft according to the present invention is shown;

[0022] Figure 4 A schematic diagram of a rotor core segment according to an embodiment of the present invention is shown;

[0023] Figure 5 A schematic diagram of an embodiment of the oil guide ring according to the present invention is shown;

[0024] Figure 6 A schematic diagram of a third embodiment of the rotor shaft according to the present invention is shown;

[0025] Figure 7 A schematic diagram of the structure of the assembly hole according to a first embodiment of the present invention is shown;

[0026] Figure 8A schematic diagram of a second embodiment of the assembly hole according to the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 1. Rotor shaft; 11. Large diameter section; 12. Small diameter section; 13. Transition section; 131. Stepped surface;

[0029] 10. Oil inlet; 101. First oil outlet; 102. Second oil outlet;

[0030] 2. Oil guide pipe; 21. Oil slinger hole;

[0031] 3. Rotor core section; 30. Assembly hole; 301. First arc-shaped section; 302. Second arc-shaped section; 303. Third arc-shaped section;

[0032] 4. Bearing; 5. Oil guide ring; 51. Annular body; 52. Oil guide groove. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0037] Combination Figures 1 to 8 As shown, according to a specific embodiment of this application, a motor rotor is provided.

[0038] The motor rotor includes a rotor shaft 1 and a rotor core segment 3. The rotor shaft 1 is a hollow structure and includes a large diameter segment 11 and a small diameter segment 12. There are two small diameter segments 12, one of which is connected to the first end of the large diameter segment 11, and the other small diameter segment 12 is connected to the second end of the large diameter segment 11. There are multiple rotor core segments 3, which are fitted onto the large diameter segment 11 of the rotor shaft 1. Multiple assembly holes 30 are opened on the rotor core segments 3. The assembly holes 30 are used for the passing of fittings to axially assemble the multiple rotor core segments 3. The edge profile of the assembly holes 30 is composed of multiple arc segments, and the centers of each arc segment are set at intervals along the circumference of the rotor core segment 3.

[0039] By applying the technical solution of this embodiment, multiple mounting holes 30 are opened on the rotor core segment 3. The edge profile of the mounting holes 30 is composed of multiple arc segments. The center of each arc segment is set at intervals along the circumference of the rotor core segment 3, so that when the mounting parts are matched with different arc segments on different rotor core segments 3, an included angle is formed between the multiple rotor core segments 3, thereby ensuring the skew angle between the rotor core segments 3. Compared with the design of opening keyways and keys on the rotor core segment 3 and the rotor shaft 1 in the prior art, this solution eliminates the keyway design and eliminates the need to process keyways or keys on the rotor shaft 1, making the manufacturing process of the rotor shaft 1 simpler and reducing the manufacturing cost of the rotor shaft 1. At the same time, it also allows the rotor shaft 1 to have better rigidity, thereby increasing the motor speed and obtaining better performance.

[0040] In one exemplary embodiment of this application, the rotor shaft 1 is manufactured using a large-diameter-ratio rotary forging process, so that the portion that mates with the rotor core section 3 (i.e., the large-diameter section 11) has a larger diameter. The hollow structure of the rotor shaft 1 enables its lightweight design. The rotor core section 3 and the rotor shaft 1 are assembled using an interference fit, which transmits torque through the interference fit. This avoids the problems of increased machining costs and increased wall thickness of the rotor shaft 1 caused by keyways, resulting in a thinner wall, higher rigidity, and greater strength for the rotor shaft 1. In this embodiment, the diameter of the large-diameter section 11 can be 60 mm, and the diameter of the small-diameter section 12 can be 30 mm or 40 mm.

[0041] It should be noted that the number, size and position of the assembly holes 30 opened on the rotor core section 3 can be changed according to actual needs. For example, in the preferred embodiment of this application, a total of four assembly holes 30 are opened, and the four assembly holes 30 are all the same size. The four assembly holes 30 are set at the positions corresponding to the N pole of the rotor core section 3, so that the assembly holes 30 also have a positioning function and facilitate assembly.

[0042] Furthermore, the assembly hole 30 includes a first arc-shaped segment 301, a second arc-shaped segment 302, and a third arc-shaped segment 303. The line connecting the center of the first arc-shaped segment 301 and the center of the rotor core segment 3 is on a first straight line; the line connecting the center of the second arc-shaped segment 302 and the center of the rotor core segment 3 is on a second straight line; there are two third arc-shaped segments 303, which are arranged opposite to each other and located between the first arc-shaped segment 301 and the second arc-shaped segment 302. The centers of the two third arc-shaped segments 303 are the same, and the line connecting the center of the third arc-shaped segment 303 and the center of the rotor core segment 3 is on a third straight line; the first straight line and the third straight line have a first included angle, and the second straight line and the third straight line have a second included angle; the assembly part is abutted against any one of the first arc-shaped segment 301, the second arc-shaped segment 302, and the third arc-shaped segment 303.

[0043] Combination Figure 4 , Figure 7 and Figure 8As shown, by making the arc segments that abut against the assembly and the rotor core segment 3 different, an included angle can be formed between adjacent rotor core segments 3, thus achieving the setting of the skew pole angle between multiple rotor core segments 3. Taking the assembly pin as an example, by having the assembly pin abut against the first arc segment 301 of the first rotor core segment 3, the third arc segment 303 of the second rotor core segment 3, and the second arc segment 302 of the third rotor core segment 3 in sequence, the corresponding skew pole angles can be formed between the first rotor core segment 3 and the second rotor core segment 3, and between the second rotor core segment 3 and the third rotor core segment 3. It should be noted that in this embodiment, different skew pole angle requirements can be achieved by adjusting the center position of the arc segments and the number of arc segments. That is, the number of arc segments can be adjusted according to actual needs. For example, the third arc segment 303 can be increased to four, six, eight, etc.

[0044] Furthermore, the first included angle and the second included angle are set to be equal. This setting ensures that the adjacent rotor core segments 3 form a consistent skew angle and facilitates adjustment of the rotor core segments 3 during assembly.

[0045] In one exemplary embodiment of this application, the diameters of the first arc segment 301, the second arc segment 302, and the third arc segment 303 are all 4 mm, and the angle values ​​of the first included angle and the second included angle are both 2°30′±0.2′.

[0046] In conjunction with the above embodiments, this application also provides a preferred embodiment of the mounting hole 30, such as... Figure 8 As shown, the first included angle is A, the second included angle is B, and the center of the first arc segment 301, the center of the second arc segment 302, and the center of the third arc segment 303 are equidistant from the center of the rotor core segment 3. That is, the center of the first arc segment 301, the center of the second arc segment 302, and the center of the third arc segment 303 are on the same arc, and the center of this arc is the center of the rotor core segment 3.

[0047] Furthermore, one end of the rotor shaft 1 is provided with an oil inlet 10 for introducing cooling oil. The rotor shaft 1 has multiple oil outlet holes. The motor rotor also includes an oil guide pipe 2, which is disposed inside the rotor shaft 1. One end of the oil guide pipe 2 is connected to the oil inlet 10 of the rotor shaft 1. The oil guide pipe 2 has at least one oil-throwing hole 21. By providing the oil-throwing hole 21 on the oil guide pipe 2 and opening the oil outlet holes on the rotor shaft 1, the cooling oil, after entering the oil guide pipe 2, can reach the outer surface of the rotor shaft 1 through the oil-throwing hole 21 and the oil outlet holes, thereby achieving cooling and lubrication of the outside of the rotor shaft 1.

[0048] Specifically, the large-diameter section 11 and the small-diameter section 12 are connected by a transition section 13. The cross-section of the transition section 13 is an inclined surface, and a stepped surface 131 is provided between the transition section 13 and the small-diameter section 12. The motor rotor also includes a bearing 4 and an oil guide ring 5. The bearing 4 is sleeved on the small-diameter section 12, and the first end of the bearing 4 abuts against the stepped surface 131. The oil guide ring 5 is connected to the outer surface of the small-diameter section 12, and at least a portion of the oil guide ring 5 abuts against the second end of the bearing 4. By having the first end of the bearing 4 abut against the stepped surface 131 and a portion of the oil guide ring 5 abut against the second end of the bearing 4, the connection of the bearing 4 becomes more stable, making it less prone to axial runout on the rotor shaft 1, thus affecting the motor performance.

[0049] Preferably, there are two oil slinger holes 21, which are disposed on the oil guide pipe 2 located within the small diameter section 12, and are symmetrically arranged about the geometric center of the oil guide pipe 2. As can be seen from the foregoing embodiments, when the oil slinger holes 21 are disposed on the oil guide pipe 2 located within the small diameter section 12, the journal of the small diameter section 12 is smaller, and the cooling oil is closer to the inner wall of the small diameter section 12. The cooling oil can more easily reach the outer surface of the small diameter section 12 through the oil outlet hole on the rotor shaft 1, resulting in a better cooling and lubrication effect on the rotor shaft 1. Furthermore, when a bearing 4 is disposed on the small diameter section 12, the placement of the oil slinger holes 21 facilitates the cooling oil to reach the bearing 4 more conveniently for cooling and lubrication.

[0050] It should be noted that an oil-throwing hole 21 can also be opened on the oil guide pipe 2 located in the large diameter section 11 to throw the cooling oil to the inner wall of the rotor shaft 1 to cool down the rotor shaft 1.

[0051] Specifically, the oil outlet includes two first oil outlets 101. The first oil outlets 101 are symmetrically arranged about the geometric center line of the rotor shaft 1. The wall of the first oil outlet 101 near the large diameter section 11 is flush with the end face of the second end of the bearing 4. By providing the first oil outlets 101, the cooling oil is thrown out from the oil guide pipe 2 through the oil throwing hole 21 and reaches the outside of the small diameter section 12 through the first oil outlets 101. Furthermore, since the wall of the first oil outlet 101 near the large diameter section 11 is flush with the end face of the second end of the bearing 4, the cooling oil can reach the bearing 4 more smoothly and cool and lubricate it.

[0052] Specifically, the oil guide ring 5 includes an annular body 51. The inner wall of the annular body 51 is connected to the outer surface of the small-diameter section 12. At least one oil guide groove 52 is provided at the end of the annular body 51 facing the bearing 4. The oil guide groove 52 extends from the inner wall of the annular body 51 to the outer wall of the annular body 51, and the groove wall of the oil guide groove 52 is positioned at a distance from the outer wall of the annular body 51. The oil guide groove 52 allows the cooling oil to flow into the bearing 4 in a predetermined direction after being thrown out from the first oil outlet 101. This is due to the radial obstruction of the groove wall of the oil guide groove 52 and the axial obstruction of the annular body 51, thus avoiding the problem of cooling oil flowing in multiple directions or being thrown out, which would cause waste of cooling oil. At the same time, it effectively improves the cooling and lubrication effect on the bearing 4. The oil guide ring 5 can be manufactured by machining and assembled with the small-diameter section 12 using a large interference fit.

[0053] Combination Figure 5 and Figure 1 As shown, in an exemplary embodiment of this application, the length of the groove wall of the oil guide groove 52 (i.e., the length from the opening of the annular body 51 facing the bearing 4 to the bottom of the oil guide groove 52) is set to be the same as the diameter of the first oil outlet hole 101. The annular body 51 and the small diameter section 12 are connected by interference fit to make the assembly more secure. After the annular body 51 and the small diameter section 12 are assembled, the bottom of the oil guide groove 52 is coplanar with the hole wall of the first oil outlet hole 101 away from the large diameter section 11. At this time, the bottom of the oil guide groove 52, the groove wall of the oil guide groove 52 and the end face of the bearing 4 together form an oil guide space to achieve the guiding and limiting effect of the cooling oil.

[0054] Preferably, four oil guiding grooves 52 are provided on the annular body 51. The four oil guiding grooves 52 are evenly spaced along the circumference of the annular body 51, and the four oil guiding grooves 52 are connected to each other. That is, a connecting flow channel is provided between adjacent oil guiding grooves 52 so that after the cooling oil is thrown out from the first oil outlet 101, it can flow to multiple oil guiding grooves 52 to flow into the bearing 4 from multiple directions, thereby improving the cooling and lubrication effect.

[0055] Furthermore, the geometric center line of the first oil outlet 101 and the geometric center line of the oil slinger 21 are located on the same cross section of the rotor shaft 1 in the axial direction, and the geometric center lines of the first oil outlet 101 and the oil slinger 21 are set at an angle in the cross section. During the high-speed rotation of the rotor shaft 1, under the action of centrifugal force and inertial force, the cooling oil cannot fly out along the direction of the geometric center line of the oil slinger 21. That is, the actual flight trajectory of the cooling oil will deviate from the geometric center line of the oil slinger 21. Setting the geometric center lines of the first oil outlet 101 and the oil slinger 21 at an angle in the cross section allows the actual flight trajectory of the cooling oil to intersect with the geometric center line of the first oil outlet 101, thereby allowing the cooling oil to pass through the first oil outlet 101 more smoothly.

[0056] It should be noted that, depending on the actual application conditions such as the preset speed of rotor shaft 1 and the actual needs of the motor, the angle between the geometric center line of the first oil outlet 101 and the geometric center line of the oil slinger 21 on the cross section can be appropriately adjusted. For example, when the preset speed of rotor shaft 1 is high, the actual trajectory of the cooling oil is deflected at a larger angle, so the angle between the geometric center line of the first oil outlet 101 and the geometric center line of the oil slinger 21 on the cross section can be increased.

[0057] Furthermore, the oil outlet includes multiple second oil outlets 102, which are located at the connection between the large-diameter section 11 and the transition section 13. By providing the second oil outlets 102, the cooling oil, after flying out from the oil slinger 21, can also reach both ends of the large-diameter section 11 through the second oil outlets 102, thereby cooling both ends of the stator winding.

[0058] In one exemplary embodiment of this application, a total of four second oil outlet holes 102 are provided. All four second oil outlet holes 102 are opened at the connection between the large diameter section 11 and the transition section 13. Two of the second oil outlet holes 102 are close to the first end of the large diameter section 11, and the other two second oil outlet holes 102 are close to the second end of the large diameter section 11.

[0059] According to another specific embodiment of this application, an electric motor is provided, which has a motor rotor and a motor stator, wherein the motor rotor is the motor rotor in the above embodiment. Since the rotor shaft 1 in the above embodiment has higher rigidity, it can support the motor to operate at higher speeds, for example, the motor speed can be 18000 r / min, 20000 r / min, or 21000 r / min.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0062] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A motor rotor, characterized in that, include: The rotor shaft (1) is a hollow structure. The rotor shaft (1) includes a large diameter section (11) and a small diameter section (12). There are two small diameter sections (12). One of the small diameter sections (12) is connected to the first end of the large diameter section (11), and the other small diameter section (12) is connected to the second end of the large diameter section (11). The rotor core segment (3) is a plurality of rotor core segments (3), which are sleeved on the large diameter segment (11) of the rotor shaft (1). The rotor core segment (3) has a plurality of assembly holes (30) for the assembly parts to pass through in order to axially assemble the plurality of rotor core segments (3). The edge profile of the assembly hole (30) is composed of a plurality of arc segments, and the center of each arc segment is set at intervals along the circumference of the rotor core segment (3). One end of the rotor shaft (1) is provided with an oil inlet (10) for introducing cooling oil. The rotor shaft (1) is provided with multiple oil outlet holes. The motor rotor also includes: Oil guide pipe (2), the oil guide pipe (2) is disposed inside the rotor shaft (1), one end of the oil guide pipe (2) is connected to the oil inlet (10) of the rotor shaft (1), and at least one oil slinger hole (21) is provided on the oil guide pipe (2). The large-diameter section (11) and the small-diameter section (12) are connected by a transition section (13), the cross section of the transition section (13) is an inclined plane, and a stepped surface (131) is provided between the transition section (13) and the small-diameter section (12). The motor rotor also includes: The bearing (4) is sleeved on the small diameter section (12), and the first end of the bearing (4) abuts against the stepped surface (131); Oil guide ring (5), the oil guide ring (5) is connected to the outer surface of the small diameter section (12), and at least part of the oil guide ring (5) abuts against the second end of the bearing (4); The oil outlet includes a first oil outlet (101), and there are two first oil outlets (101). The first oil outlets (101) are symmetrically arranged about the geometric center line of the rotor shaft (1). The hole wall of the first oil outlet (101) near the large diameter section (11) is flush with the end face of the second end of the bearing (4).

2. The motor rotor according to claim 1, characterized in that, The assembly hole (30) includes: The first arc segment (301) has a line connecting the center of the first arc segment (301) and the center of the rotor core segment (3) on a first straight line; The second arc segment (302) has a line connecting the center of the second arc segment (302) and the center of the rotor core segment (3) on a second straight line; The third arc segment (303) consists of two segments, which are arranged opposite each other and located between the first arc segment (301) and the second arc segment (302). The two arc segments (303) have the same center, and the line connecting the center of the third arc segment (303) and the center of the rotor core segment (3) is on the third straight line. The first straight line and the third straight line have a first angle, and the second straight line and the third straight line have a second angle; The assembly is configured to abut against any one of the first arc segment (301), the second arc segment (302), and the third arc segment (303).

3. The motor rotor according to claim 2, characterized in that, The first included angle and the second included angle are set to be equal.

4. The motor rotor according to claim 1, characterized in that, There are two oil-throwing holes (21), which are located on the oil guide pipe (2) within the small diameter section (12). The two oil-throwing holes (21) are symmetrically arranged about the geometric center of the oil guide pipe (2).

5. The motor rotor according to claim 4, characterized in that, The oil guide ring (5) includes: An annular body (51) has its inner wall connected to the outer surface of the small diameter section (12). At least one oil guide groove (52) is provided at one end of the annular body (51) facing the bearing (4). The oil guide groove (52) extends along the inner wall of the annular body (51) toward the outer wall of the annular body (51). The groove wall of the oil guide groove (52) is provided at a distance from the outer wall of the annular body (51).

6. The motor rotor according to claim 4, characterized in that, The geometric center line of the first oil outlet hole (101) and the geometric center line of the oil slinger hole (21) are located on the same cross section of the rotor shaft (1) in the axial direction, and the geometric center line of the first oil outlet hole (101) and the geometric center line of the oil slinger hole (21) are set at an angle on the cross section.

7. The motor rotor according to claim 1, characterized in that, The oil outlet includes a second oil outlet (102), and there are multiple second oil outlets (102), which are opened at the connection between the large diameter section (11) and the transition section (13).

8. An electric motor, the electric motor having a motor rotor and a motor stator, characterized in that, The motor rotor is the motor rotor according to any one of claims 1-7.

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