A rotor structure, a driving mechanism, a power assembly and a vehicle

Abstract

The application discloses a rotor structure, a driving mechanism, a power assembly and a vehicle. The rotor structure comprises a rotor shaft and a transmission shaft. The transmission shaft is arranged in the rotor shaft along a first direction, and a cooling cavity is formed between the rotor shaft and the transmission shaft. The transmission shaft is provided with a liquid inlet channel, and the rotor shaft is provided with a liquid outlet hole. The cooling cavity is in communication with the liquid inlet channel and the liquid outlet hole respectively. The size of the cooling cavity along a second direction increases from the end of the rotor shaft to the liquid outlet hole. In this way, when the rotor shaft rotates, the cooling medium in the cooling cavity is subjected to centrifugal force directed to the liquid outlet hole, so that the cooling medium converges towards the liquid outlet hole, and the leakage of the cooling medium from the gap at the end of the rotor shaft is avoided, thereby improving the heat dissipation efficiency.

Description

Technical Field

[0001] This application belongs to the field of heat dissipation technology, specifically relating to a rotor structure, drive mechanism, powertrain, and vehicle. Background Technology

[0002] The rotor structure is one of the core components of an engine, and its stable and reliable operation directly affects the overall reliability and service life of the engine. The rotor structure includes a rotor shaft and a drive shaft, with a cooling chamber between them containing a cooling medium. The rotor structure dissipates heat through this cooling medium.

[0003] In related technologies, due to assembly process issues between the rotor shaft and the drive shaft, gaps are generated between them, making it easy for the cooling medium to leak from the gaps, resulting in low heat dissipation efficiency of the rotor structure. Summary of the Invention

[0004] This application aims to provide a rotor structure, drive mechanism, powertrain, and vehicle that at least solves the problem of low heat dissipation efficiency of rotor structures in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a rotor structure, including a rotor shaft and a drive shaft; the drive shaft passes through the rotor shaft along a first direction, and a cooling cavity is formed between the rotor shaft and the drive shaft; the drive shaft is provided with a liquid inlet channel, the rotor shaft is provided with a liquid outlet hole, and the cooling cavity is connected to the liquid inlet channel and the liquid outlet hole respectively; from the end of the rotor shaft to the liquid outlet hole, the size of the cooling cavity increases along a second direction, the first direction being the axial direction of the rotor shaft, and the second direction being the radial direction of the rotor shaft.

[0006] Optionally, the rotor shaft has a first end and a second end disposed opposite to each other along the first direction, and the liquid outlet is located between the first end and the second end; from the first end to the liquid outlet, the size of the cooling cavity increases along the second direction; from the second end to the liquid outlet, the size of the cooling cavity increases along the second direction.

[0007] Optionally, the liquid outlet holes are provided in two sets, and the two sets of liquid outlet holes are spaced apart along the first direction; each set of liquid outlet holes includes a plurality of liquid outlet holes spaced apart circumferentially along the rotor shaft, and each liquid outlet hole is connected to the cooling cavity.

[0008] Optionally, the drive shaft is provided with a connecting hole; along the first direction, the connecting hole is located between the two sets of liquid outlet holes, and the connecting hole is connected to the liquid inlet channel and the cooling chamber respectively.

[0009] Optionally, multiple connecting holes are provided; the multiple connecting holes are arranged at intervals along the circumference of the drive shaft, and the multiple connecting holes are located between the two sets of liquid outlet holes.

[0010] Optionally, the rotor shaft has a receiving cavity, and the drive shaft passes through the receiving cavity and surrounds the rotor shaft to form the cooling cavity; the size of the receiving cavity increases along the second direction from the end of the rotor shaft to the liquid outlet hole.

[0011] Optionally, the rotor structure further includes a rotor core; the rotor core is sleeved on the rotor shaft, and a first channel is formed between the rotor core and the rotor shaft; the rotor core is provided with a second channel and a third channel; the first channel and the third channel extend along the first direction, and the second channel extends along the second direction; the first channel is connected to the liquid outlet and the second channel respectively; one end of the third channel is connected to the second channel, and the other end of the third channel is connected to the outside.

[0012] Optionally, the rotor core is further provided with a first liquid-throwing port; the first liquid-throwing port is located at the end of the third channel away from the second channel, and the first liquid-throwing port is used to connect the third channel and the external environment; the axis of the first liquid-throwing port is set at an acute angle to the first direction.

[0013] Optionally, multiple first channels, second channels, third channels, and first liquid ejection ports are provided; multiple first channels and multiple third channels are arranged circumferentially along the rotor shaft, and multiple third channels are located on the outer periphery of multiple first channels; each first channel is connected to one liquid outlet and one second channel, and each third channel is connected to one second channel and one first liquid ejection port.

[0014] Optionally, along the circumference of the rotor shaft, the extension directions of two adjacent first channels are opposite, and two adjacent first liquid ejection ports are respectively disposed on both sides of the rotor core along the first direction, and the two adjacent first liquid ejection ports are staggered from each other.

[0015] Optionally, the third channel includes at least two sub-channels; the at least two sub-channels extend along the first direction, one end of each sub-channel is connected to the second channel, and the other end of each sub-channel is connected to the first liquid ejection port.

[0016] Optionally, the rotor core includes a magnet assembly and two end plates; the magnet assembly is sleeved on the rotor shaft, the two end plates are respectively disposed on both sides of the magnet assembly along the first direction, the magnet assembly and the rotor shaft enclose to form the first channel, the magnet assembly and the end plates enclose to form the second channel, the magnet assembly is provided with the third channel, the third channel penetrates the magnet assembly, and each end plate has the first liquid ejection port.

[0017] Optionally, the magnet assembly includes multiple sub-magnets; the multiple sub-magnets are stacked along the first direction, and there is a gap between two adjacent sub-magnets; the magnet assembly is provided with a fourth channel that runs through the first direction, and the end plate is provided with a second liquid ejection port, the fourth channel connecting the gap and the second liquid ejection port.

[0018] Secondly, embodiments of this application propose a drive mechanism, including the rotor structure described in the above embodiments.

[0019] Thirdly, embodiments of this application propose a powertrain that includes the rotor structure described in the above embodiments, or the drive mechanism described in the above embodiments.

[0020] Fourthly, embodiments of this application propose a vehicle that includes the rotor structure described in the above embodiments, or the drive mechanism described in the above embodiments, or the powertrain described in the above embodiments.

[0021] In this embodiment, a cooling cavity is formed between the rotor shaft and the drive shaft along a first direction, with the drive shaft and the rotor shaft enclosing each other. The cooling cavity is connected to the liquid inlet channel of the drive shaft and the liquid outlet of the rotor shaft, so that the cooling medium can enter the cooling cavity through the liquid inlet channel to dissipate heat from the rotor shaft and the drive shaft. Furthermore, the size of the cooling cavity increases along a second direction from the end of the rotor shaft to the liquid outlet. Thus, when the rotor shaft rotates, the cooling medium in the cooling cavity will be subjected to centrifugal force pointing towards the liquid outlet, causing the cooling medium to converge towards the liquid outlet, preventing the cooling medium from leaking from the end gap of the rotor shaft, thereby improving the heat dissipation efficiency.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a rotor structure according to an embodiment of this application; Figure 2 This is one of the side views of the rotor structure according to an embodiment of this application; Figure 3 This is a second side view of the rotor structure according to an embodiment of this application; Figure 4 This is a side view of the rotor core according to an embodiment of this application; Figure 5 It is along Figure 2 Sectional view of line AA in the middle; Figure 6 yes Figure 5 An enlarged view of section B, shown in the center circle; Figure 7 It is along Figure 2 A cross-sectional view of the CC line; Figure 8 This is a schematic diagram of a rotor shaft according to an embodiment of this application; Figure 9 It is along Figure 8 Sectional view of the DD line; Figure 10 It is along Figure 8 Sectional view of the middle EE line; Figure 11 This is a schematic diagram of a drive shaft according to an embodiment of this application; Figure 12 It is along Figure 11 A cross-sectional view of the FF line.

[0024] Figure label: 10. Drive shaft; 101. Liquid inlet channel; 102. Connecting hole; 103. Liquid inlet; 20. Rotor shaft; 21. Limiting part; 201. Cooling chamber; 202. Liquid outlet; 202a. First set of liquid outlets; 202b. Second set of liquid outlets; 203. First end; 204. Second end; 30. Rotor core; 31. Magnet assembly; 31a. Sub-magnet; 32. End plate; 33. Pressure ring; 301. First channel; 302. Second channel; 303. Third channel; 303a. Sub-channel; 304. First liquid ejection port; 305. Second liquid ejection port; 306. Fourth channel; X, the first direction; Y, the second direction. Detailed Implementation

[0025] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The rotor structure, drive mechanism, powertrain, and vehicle provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0030] like Figures 1 to 5As shown in the embodiment of this application, a rotor structure is proposed, including a rotor shaft 20 and a transmission shaft 10. The transmission shaft 10 passes through the rotor shaft 20 along a first direction X, and a cooling cavity 201 is formed between the rotor shaft 20 and the transmission shaft 10. The transmission shaft 10 is provided with a liquid inlet channel 101, and the rotor shaft 20 is provided with a liquid outlet hole 202. The cooling cavity 201 is connected to the liquid inlet channel 101 and the liquid outlet hole 202 respectively. From the end of the rotor shaft 20 to the liquid outlet hole 202, the size of the cooling cavity 201 increases along a second direction Y. The first direction X is the axial direction of the rotor shaft 20, and the second direction Y is the radial direction of the rotor shaft 20.

[0031] In this embodiment, the drive shaft 10 passes through the rotor shaft 20 along the first direction X, and a cooling chamber 201 is formed between the rotor shaft 20 and the drive shaft 10. The cooling chamber 201 is connected to the liquid inlet channel 101 of the drive shaft 10 and the liquid outlet hole 202 of the rotor shaft 20, so that the cooling medium can enter the cooling chamber 201 through the liquid inlet channel 101, thereby dissipating heat from the rotor shaft 20 and the drive shaft 10. Furthermore, the size of the cooling chamber 201 increases along the second direction Y from the end of the rotor shaft 20 to the liquid outlet hole 202. Thus, when the rotor shaft 20 rotates, the cooling medium in the cooling chamber 201 will be subjected to centrifugal force pointing towards the liquid outlet hole 202, thereby causing the cooling medium to converge towards the liquid outlet hole 202, preventing the cooling medium from leaking from the end gap of the rotor shaft 20, thereby improving the heat dissipation efficiency.

[0032] Understandably, due to assembly limitations, a gap will form between the end of the rotor shaft 20 and the end of the drive shaft 10 along the second direction Y. Cooling medium can easily leak from this gap to the outside of the rotor shaft 20. This reduces the flow rate of cooling medium within the cooling chamber 201, hindering heat dissipation between the rotor shaft 20 and the drive shaft 10. According to the centrifugal force formula, if the distance between the object and the axis of rotation is r and the mass is m, the magnitude of the centrifugal force acting on the object can be expressed by the formula F = mω. 2 r represents the rotation axis of the rotor shaft 20 in this embodiment. The distance between the cooling medium and the rotation axis of the rotor shaft 20 along the radial direction of the rotor shaft 20 is r. Since the cooling chamber 201 is designed to be small at the end and large in the middle, the distance between the cooling medium at the end of the rotor shaft 20 and the rotation axis of the rotor shaft 20 is the first distance, and the distance between the cooling medium at the middle position of the rotor shaft 20 and the rotation axis of the rotor shaft 20 is the second distance, which is greater than the first distance. Therefore, the centrifugal force on the cooling medium at the end is less than the centrifugal force on the cooling medium at the middle position, thereby causing the cooling medium to form a centrifugal pressure gradient from the end of the rotor shaft 20 to the outlet hole 202, which in turn causes the cooling medium to accumulate from the end to the middle, thereby preventing the cooling medium from leaking from the gap at the end.

[0033] In addition, such as Figure 5 As shown, the rotor shaft 20 is also provided with a liquid inlet 103, which is connected to the liquid inlet channel 101 and is also connected to a pumping device. The pumping device is used to pump the cooling medium into the liquid inlet 103. The cooling medium in this application is not only subjected to the pressure of the pumping device, but also to the centrifugal force in the direction of the liquid outlet 202, which can increase the flow rate of the cooling medium in the cooling chamber 201, thereby improving the heat dissipation efficiency.

[0034] It should be noted that the increase in the size of the cooling cavity 201 along the second direction Y can be understood as the increase in the size of the cooling cavity 201 along the second direction Y, or a step-like increase; for example, the size of the cooling cavity 201 along the second direction Y increases linearly, that is, the cavity wall of the cooling cavity 201 is a smooth inclined surface; or the cavity wall of the cooling cavity 201 is arranged in a stepped shape.

[0035] For example, such as Figure 5 As shown, the drive shaft 10 is provided with a connecting hole 102, which is connected to the cooling chamber 201. Along the first direction X, the connecting hole 102 is located on the side of the liquid outlet hole 202 away from the end of the rotor shaft 20. The step-like increase in the size of the cooling chamber 201 along the second direction Y means that the size of the cooling chamber 201 at the end of the rotor shaft 20 along the second direction Y is initially unchanged, but then increases to the position of the liquid outlet hole 202. However, from the liquid outlet hole 202 to the connecting hole 102, the size of the cooling chamber 201 along the second direction Y remains unchanged.

[0036] In some embodiments, the cooling medium includes at least one of insulating cooling oil, water-glycol-based coolant, and automatic transmission fluid. Those skilled in the art can select the appropriate medium based on actual needs, and this application does not limit the choice.

[0037] Understandably, the first direction X and the second direction Y are perpendicular to each other. Specifically, this can be "perpendicular" in the strict sense, meaning that the angle between the first direction X and the second direction Y is 90°; or it can be "approximately perpendicular," specifically meaning that the angle between the first direction X and the second direction Y includes a certain error. Considering the measurement and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system), this error is within the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, the angle between the first direction X and the second direction Y is 90° ± 5°.

[0038] Optionally, such as Figure 5As shown, the rotor shaft 20 has a first end 203 and a second end 204 disposed opposite to each other along the first direction X, and the liquid outlet hole 202 is located between the first end 203 and the second end 204; from the first end 203 to the liquid outlet hole 202, the size of the cooling chamber 201 increases along the second direction Y; from the second end 204 to the liquid outlet hole 202, the size of the cooling chamber 201 increases along the second direction Y.

[0039] In this embodiment, by providing opposing first ends 203 and second ends 204 along a first direction X on the rotor shaft 20, with the liquid outlet 202 located between the first ends 203 and the second ends 204, the size of the cooling chamber 201 increases along the second direction Y from the first end 203 to the liquid outlet 202, and also increases along the second direction Y from the second end 204 to the liquid outlet 202. This facilitates smoother confluence of the cooling medium as it flows from the first end 203 and the second end 204 towards the intermediate position, thereby reducing flow resistance loss.

[0040] It should be noted that the increase in the size of the cooling cavity 201 along the second direction Y from the first end 203 to the liquid outlet 202 can be understood as the cooling cavity 201 first remaining unchanged along the second direction Y, then gradually increasing, and finally remaining unchanged; the slope of the cavity wall of the cooling cavity 201 corresponding to the increased part is the first slope.

[0041] It should be noted that the increase in the size of the cooling cavity 201 along the second direction Y from the second end 204 to the liquid outlet 202 can be understood as the cooling cavity 201 first remaining unchanged, then gradually increasing, and finally remaining unchanged; the slope of the cavity wall of the increased part of the cooling cavity 201 is the second slope.

[0042] It is understood that the absolute values ​​of the first slope and the second slope can be the same or different, and the embodiments of this application do not impose any restrictions on this.

[0043] It should be noted that the location of the liquid outlet 202 between the first end 203 and the second end 204 can be understood as the distance between the liquid outlet 202 and the first end 203 and the distance between the liquid outlet 202 and the second end 204 can be equal or unequal.

[0044] Preferably, the distance between the liquid outlet 202 and the first end 203 is equal to the distance between the liquid outlet 202 and the second end 204. This ensures that the cooling medium has a similar or equal flow path to the rotor shaft 20 during the flow from both ends to the liquid outlet 202, which is beneficial for the uniform heat dissipation of the rotor shaft 20.

[0045] Optionally, such as Figure 5 and Figure 6As shown, there are two sets of liquid outlet holes 202, which are spaced apart along the first direction X. Each set of liquid outlet holes 202 includes multiple liquid outlet holes 202 spaced apart circumferentially along the rotor shaft 20, and each liquid outlet hole 202 communicates with the cooling chamber 201. Preferably, each set of liquid outlet holes 202 includes three liquid outlet holes 202 evenly spaced apart circumferentially along the rotor shaft 20.

[0046] In this embodiment, by arranging two sets of outlet holes 202 at intervals along the first direction X, the cooling medium flowing into the first end 203 of the rotor shaft 20 flows to the closer set of outlet holes 202, and the medium flowing into the second end 204 flows to the other set of outlet holes 202, thereby reducing the flow resistance of the cooling medium; and each set of outlet holes 202 includes multiple outlet holes 202 spaced apart along the circumference of the rotor shaft 20, and each outlet hole 202 is connected to the cooling chamber 201, so that the cooling medium dissipates heat evenly to the circumference of the rotor shaft 20.

[0047] For example, such as Figure 5 , Figure 6 , Figures 8 to 10 As shown, the two sets of liquid outlet holes 202 are the first set of liquid outlet holes 202a and the second set of liquid outlet holes 202b, respectively. The first set of liquid outlet holes 202a is located on the side closer to the first end 203 than the second set of liquid outlet holes 202b, and the second set of liquid outlet holes 202b is located on the side closer to the second end 204 than the first set of liquid outlet holes 202a. Both the first set of liquid outlet holes 202a and the second set of liquid outlet holes 202b include three liquid outlet holes 202, which are evenly arranged along the circumference of the rotor shaft 20. The three liquid outlet holes 202a of the first set of liquid outlet holes 202a and the three liquid outlet holes 202b of the second set of liquid outlet holes 202b are staggered along the circumference of the rotor shaft 20 to facilitate uniform liquid discharge from the rotor shaft 20 through the first set of liquid outlet holes 202a and the second set of liquid outlet holes 202b.

[0048] Of course, the first set of liquid outlet holes 202a and the second set of liquid outlet holes 202b may also include other numbers of liquid outlet holes 202, such as four, five or six, and the embodiments of this application do not limit this.

[0049] It is understandable that, such as Figures 8 to 10As shown, the staggered arrangement of the three outlet holes 202 of the first group of outlet holes 202a and the three outlet holes 202 of the second group of outlet holes 202b along the circumference of the rotor shaft 20 can be understood as follows: in a plane perpendicular to the first direction X, the orthographic projections of the three outlet holes 202 of the first group of outlet holes 202a along the first direction X and the orthographic projections of the three outlet holes 202 of the second group of outlet holes 202b are evenly spaced along the circumference of the rotor shaft 20. That is, one outlet hole 202 of the first group of outlet holes 202a and one outlet hole 202 of the adjacent second group of outlet holes 202b are set at 60°, and two adjacent outlet holes 202 in the first group of outlet holes 202a are set at 120°.

[0050] Optionally, such as Figure 5 and Figure 12 As shown, the drive shaft 10 is provided with a connecting hole 102; along the first direction X, the connecting hole 102 is located between two sets of liquid outlet holes 202, and the connecting hole 102 is connected to the liquid inlet channel 101 and the cooling chamber 201 respectively.

[0051] In this embodiment, by providing a connecting hole 102 in the drive shaft 10 and placing the connecting hole 102 between two sets of liquid outlet holes 202, the connecting hole 102 is connected to the liquid inlet channel 101 and the cooling chamber 201 respectively. In this way, after the cooling medium flows in through the liquid inlet channel 101, it enters the cooling chamber 201 through the connecting hole 102 and simultaneously flows into the two sets of liquid outlet holes 202, thereby reducing the path to the two sets of liquid outlet holes 202 and increasing the flow rate into the two sets of liquid outlet holes 202.

[0052] It is understandable that the connection hole 102 is located between the two sets of liquid outlet holes 202, which can be interpreted as the distance between the connection hole 102 and the two sets of liquid outlet holes 202 being equal, or the distance between the connection hole 102 and the two sets of liquid outlet holes 202 being unequal.

[0053] Optionally, such as Figure 5 , Figure 11 and Figure 12 As shown, multiple connecting holes 102 are provided; the multiple connecting holes 102 are arranged at intervals along the circumference of the drive shaft 10, and the multiple connecting holes 102 are located between the two sets of liquid outlet holes 202.

[0054] In this embodiment, by arranging multiple connecting holes 102 at intervals along the circumference of the drive shaft 10, and by placing the multiple connecting holes 102 between the two sets of liquid outlet holes 202, the flow rate of the cooling medium into the two sets of liquid outlet holes 202 can be increased through the multiple connecting holes 102, thereby improving the heat dissipation efficiency.

[0055] For example, such as Figure 11 and Figure 12As shown, the multiple connecting holes 102 are configured as four connecting holes 102, which are evenly spaced along the circumference of the drive shaft 10, and are set at 90° between adjacent connecting holes 102.

[0056] Optionally, such as Figure 5 As shown, the rotor shaft 20 has a receiving cavity, and the transmission shaft 10 passes through the receiving cavity and surrounds the rotor shaft 20 to form a cooling cavity 201; from the end of the rotor shaft 20 to the liquid outlet 202, the size of the receiving cavity increases along the second direction Y.

[0057] In this embodiment of the application, by providing a receiving cavity in the rotor shaft 20, the transmission shaft 10 passes through the receiving cavity and surrounds the rotor shaft 20 to form a cooling cavity 201. From the end of the rotor shaft 20 to the liquid outlet 202, the size of the receiving cavity increases along the second direction Y. This facilitates the assembly between the transmission shaft 10 and the rotor shaft 20, thereby facilitating the formation of the cooling cavity 201.

[0058] In other embodiments, the size of the receiving cavity remains unchanged along the second direction Y from the end of the rotor shaft 20 to the liquid outlet 202; the outer diameter of the drive shaft 10 is reduced from the end of the rotor shaft 20 to the liquid outlet 202, thereby forming a cooling cavity 201 with small ends and large middle between the outer sidewall of the drive shaft 10 and the inner sidewall of the receiving cavity.

[0059] Optionally, such as Figure 1 , Figures 4 to 6 As shown, the rotor structure also includes a rotor core 30; the rotor core 30 is sleeved on the rotor shaft 20, and the rotor core 30 and the rotor shaft 20 enclose a first channel 301. The rotor core 30 is provided with a second channel 302 and a third channel 303. The first channel 301 and the third channel 303 extend along a first direction X, and the second channel 302 extends along a second direction Y. The first channel 301 is connected to the liquid outlet 202 and the second channel 302 respectively. One end of the third channel 303 is connected to the second channel 302, and the other end of the third channel 303 is connected to the external environment.

[0060] In this embodiment, the rotor core 30 is fitted onto the rotor shaft 20, forming a first channel 301 between the rotor core 30 and the rotor shaft 20. A second channel 302 and a third channel 303 are provided within the rotor core 30. The first channel 301 and the third channel 303 extend along a first direction X, and the second channel 302 extends along a second direction Y. The first channel 301 communicates with the liquid outlet 202 and the second channel 302, respectively. One end of the third channel 303 communicates with the second channel 302, and the other end of the third channel 303 communicates with the outside. This allows the cooling medium flowing from the liquid outlet 202 to directly enter the first channel 301 and, via the second channel 302 extending along the second direction Y and the third channel 303 extending along the first direction X, flow through the radial and axial regions of the rotor core 30, thereby carrying away the heat generated during the operation of the rotor core 30, which is beneficial for heat dissipation of the rotor structure.

[0061] It should be noted that, as Figure 6 As shown, the first channel 301 enclosed by the rotor core 30 and the rotor shaft 20 can extend from the liquid outlet 202 to the second channel 302, or it can pass through the magnet assembly 31 of the rotor core 30 along the first direction X. This application embodiment does not limit this.

[0062] It should be noted that the external environment refers to the environment located outside the rotor structure.

[0063] Optionally, such as Figure 5 and Figure 6 As shown, the rotor core 30 is also provided with a first liquid ejection port 304; the first liquid ejection port 304 is located at the end of the third channel 303 away from the second channel 302, and the first liquid ejection port 304 is used to connect the third channel 303 and the external environment; the axis of the first liquid ejection port 304 is set at an acute angle with the first direction X.

[0064] In this embodiment, the first liquid-throwing port 304 of the rotor core 30 is located at the end of the third channel 303 away from the second channel 302. The first liquid-throwing port 304 connects the third channel 303 and the external environment, and the axis of the first liquid-throwing port 304 is set at an acute angle to the first direction X. This ensures that when the cooling medium is discharged from the third channel 303, the outflow direction of the cooling medium has both axial and radial components. When the rotor core 30 rotates, under the action of the inclined liquid-throwing port and centrifugal force, the cooling medium is more easily thrown outward, avoiding the accumulation or backflow of the cooling medium at the end of the third channel 303. This helps to reduce the drainage resistance and increase the circulation velocity of the cooling medium in the first channel 301, the second channel 302, and the third channel 303, thereby enhancing the heat exchange efficiency.

[0065] In some embodiments, the first liquid ejection port 304 is cylindrical, and the axis of the first liquid ejection port 304 is the axis of the cylinder.

[0066] For example, the acute angle between the axis of the first liquid ejection port 304 and the first direction X can be set to any value among 30°, 35°, 40°, 45°, 50°, 55°, and 60°, or any range between two values.

[0067] Optionally, such as Figure 6 As shown, there are multiple first channels 301, second channels 302, third channels 303 and first liquid ejection port 304; multiple first channels 301 and multiple third channels 303 are arranged at intervals along the circumference of the rotor shaft 20, and multiple third channels 303 are located on the outer periphery of multiple first channels 301; each first channel 301 is connected to a liquid outlet 202 and a second channel 302, and each third channel 303 is connected to a second channel 302 and a first liquid ejection port 304.

[0068] In this embodiment, multiple first channels 301, multiple second channels 302, multiple third channels 303, and multiple first liquid-throwing ports 304 are provided. The first channels 301 and the third channels 303 are spaced apart circumferentially along the rotor shaft 20, with the third channels 303 located on the outer periphery of the first channels 301. Each first channel 301 connects to a liquid outlet 202 and a second channel 302, and each third channel 303 connects to a second channel 302 and a first liquid-throwing port 304. This arrangement allows for the uniform distribution of multiple independent cooling branches along the circumferential direction within the rotor core 30, enabling the cooling medium to cover the circumference of the rotor core 30 and achieving uniform heat dissipation around the rotor core 30. Each cooling branch is formed by sequentially connecting a first channel 301, a second channel 302, a third channel 303, and a first liquid-throwing port 304.

[0069] Optionally, such as Figure 2 and Figure 3 , Figure 5 and Figure 6 As shown, along the circumference of the rotor shaft 20, the extension directions of two adjacent first channels 301 are opposite, and two adjacent first liquid ejection ports 304 are respectively arranged on both sides of the rotor core 30 along the first direction X, and the two adjacent first liquid ejection ports 304 are staggered.

[0070] In this embodiment, by making the extension directions of two adjacent first channels 301 opposite, and two adjacent first liquid-throwing ports 304 are respectively disposed on both sides of the rotor core 30 along the first direction X, and the two adjacent first liquid-throwing ports 304 are staggered, the cooling medium flows in opposite directions within the adjacent first channels 301, and sequentially passes through the corresponding second channels 302 and third channels 303, and is simultaneously discharged outwards from both ends of the rotor core 30 along the axial direction. This allows the rotor core 30 to achieve dynamic balance during liquid-throwing, which is beneficial to the stability of the rotor structure rotation. In addition, the fact that the two adjacent first liquid-throwing ports 304 are respectively disposed on both sides of the rotor core 30 along the first direction X allows the cooling medium to be discharged outwards from both ends of the rotor core 30 along the axial direction, achieving heat dissipation at both ends of the rotor core 30.

[0071] It should be noted that, as Figure 6 As shown, along the circumference of the rotor shaft 20, the opposite extension directions of two adjacent first channels 301 can be understood as follows: after the cooling medium flowing out of the liquid outlet 202 flows into the two adjacent first channels 301, it can move to the right through one of the first channels 301 and to the left through the other first channel 301.

[0072] In some embodiments, such as Figure 2 , Figure 3 and Figure 6 As shown, the rotor core 30 has a first side and a second side on both sides along the first direction X. Each of the first side and the second side is provided with three first liquid ejection ports 304. The three first liquid ejection ports 304 on the same side are evenly arranged along the circumference of the rotor shaft 20, that is, the three first liquid ejection ports 304 on the same side are arranged at 60° between each other.

[0073] It should be noted that, as Figure 2 and Figure 3 As shown, along the circumference of the rotor shaft 20, the staggered arrangement of two adjacent first liquid ejection ports 304 can be understood as the staggered arrangement of two adjacent first liquid ejection ports 304 located on different sides.

[0074] Specifically, in a plane perpendicular to the first direction X, the orthographic projections of the three first liquid ejection ports 304 on the first side along the first direction X and the orthographic projections of the three first liquid ejection ports 304 on the second side are evenly spaced in the circumferential direction of the rotor shaft 20, that is, the orthographic projections of one of the liquid outlet holes 202 of the three first liquid ejection ports 304 on the first side and the adjacent first liquid ejection port 304 on the second side are arranged at 60°.

[0075] Optionally, such as Figure 4 and Figure 6As shown, the third channel 303 includes at least two sub-channels 303a; the at least two sub-channels 303a extend along the first direction X, one end of each sub-channel 303a is connected to the second channel 302, and the other end of each sub-channel 303a is connected to the first liquid ejection port 304.

[0076] In this embodiment, at least two sub-channels 303a extend along the first direction X. One end of each sub-channel 303a is connected to the second channel 302, and the other end of each sub-channel 303a is connected to the first liquid-throwing port 304. In this way, after the cooling medium is diverted from the second channel 302 into the multiple sub-channels 303a, the contact area with the rotor core 30 is increased, thereby improving the heat dissipation efficiency of the rotor core 30.

[0077] In some embodiments, such as Figure 4 As shown, the sub-channel 303a is arranged in a fan shape and passes through the magnet assembly 31 of the rotor core 30 along the first direction X.

[0078] Optionally, such as Figure 5 and Figure 6 As shown, the rotor core 30 includes a magnet assembly 31 and two end plates 32; the magnet assembly 31 is sleeved on the rotor shaft 20, and the two end plates 32 are respectively disposed on both sides of the magnet assembly 31 along the first direction X. The magnet assembly 31 and the rotor shaft 20 enclose to form a first channel 301, the magnet assembly 31 and the end plates 32 enclose to form a second channel 302, the magnet assembly 31 is provided with a third channel 303, the third channel 303 penetrates the magnet assembly 31, and each end plate 32 has a first liquid ejection port 304.

[0079] In this embodiment, the magnet assembly 31 is sleeved on the rotor shaft 20, and two end plates 32 are respectively disposed on both sides of the magnet assembly 31 along the first direction X. The magnet assembly 31 and the rotor shaft 20 enclose a first channel 301, and the magnet assembly 31 and the end plates 32 enclose a second channel 302. The magnet assembly 31 is provided with a third channel 303, which penetrates the magnet assembly 31 so that the cooling medium can flow directly through the inner circumferential surface, i.e., the end face, of the magnet assembly 31, thereby dissipating heat inside the magnet assembly 31. Furthermore, the two end plates 32 are respectively disposed on both sides of the magnet assembly 31 along the first direction X, and each end plate 32 has a first liquid ejection port 304, so as to axially limit the magnet assembly 31 through the end plate 32, and at the same time serve as the turning cavity of the cooling flow channel and the carrier of the first liquid ejection port 304. There is no need to set up flow channel components, which helps to reduce the number of parts in the rotor structure and improve the integration of the rotor structure.

[0080] In some embodiments, the fit between the end plate 32 and the end face of the magnet assembly 31 can form a reliable sealing interface, effectively preventing the cooling medium from leaking from the sealing interface.

[0081] In some embodiments, a limiting portion 21 is provided on the outer periphery of the rotor shaft 20. The limiting portion 21 is arranged circumferentially around the rotor shaft 20, and one end plate 32 abuts against the limiting portion 21 along the first direction X. The rotor structure also includes a pressure ring 33, which is disposed on the side of the other end plate 32 away from the magnet assembly 31. The pressure ring 33 is sleeved on the rotor shaft 20, and the pressure ring 33 abuts against the other end plate 32 along the first direction X. In this way, by pressing the magnet assembly 31 and the two end plates 32 together between the limiting portion 21 and the pressure ring 33, the magnet assembly 31 and the two end plates 32 are limited along the first direction X, preventing displacement of the magnet assembly 31 and the two end plates 32 along the first direction X and improving the stability of the rotor structure.

[0082] Optionally, such as Figure 4 and Figure 7 As shown, the magnet assembly 31 includes multiple sub-magnets 31a; the multiple sub-magnets 31a are stacked along the first direction X, and there is a gap between two adjacent sub-magnets 31a; the magnet assembly 31 is provided with a fourth channel 306 that runs through along the first direction X, and the end plate 32 is provided with a second liquid ejection port 305, the fourth channel 306 connects the gap and the second liquid ejection port 305.

[0083] In this embodiment, multiple sub-magnets 31a are stacked along a first direction X, with gaps between adjacent sub-magnets 31a. The magnet assembly 31 has a fourth channel 306 extending along the first direction X, and the end plate 32 has a second liquid discharge port 305. The fourth channel 306 connects the gaps and the second liquid discharge port 305. This allows the cooling medium remaining in the gaps to be discharged to the outside of the magnet assembly 31 through the fourth channel 306 and the second liquid discharge port 305, preventing the cooling medium from stagnating in the gaps and causing excessive local temperature rise in the magnets. This also prevents high-temperature demagnetization and thermal stress damage to the sub-magnets 31a due to interlayer heat accumulation, thereby improving the thermal stability and service life of the magnet assembly 31. In addition, the cooling medium remaining in the gaps can cause uneven mass distribution in the magnet assembly 31, affecting the dynamic balance of the magnet assembly 31 during rotation. The cooling medium remaining in the gaps can be discharged to the outside of the magnet assembly 31 through the fourth channel 306 and the second liquid discharge port 305, which helps to improve the dynamic balance of the magnet assembly 31 during rotation.

[0084] In some embodiments, such as Figure 5 and Figure 6 As shown, the number of sub-magnets 31a is set to six. The six sub-magnets 31a are stacked along the first direction X. From left to right, the six sub-magnets 31a are the first sub-magnet 31a, the second sub-magnet 31a, the third sub-magnet 31a, the fourth sub-magnet 31a, the fifth sub-magnet 31a, and the sixth sub-magnet 31a. Figure 6Taking the first channel 301 shown in the diagram as an example, the first channel 301 located on the upper side of the rotor shaft 20 is formed by the third sub-magnet 31a, the fourth sub-magnet 31a, the fifth sub-magnet 31a, the sixth sub-magnet 31a, and the rotor shaft 20. The third sub-magnet 31a abuts against the rotor shaft 20 at a position corresponding to the upper first channel 301, preventing the cooling medium from flowing out from the left side of the upper first channel 301, thereby improving the flow path of the cooling medium in the magnet assembly 31. Similarly, the first channel 301 located on the upper side of the rotor shaft 20 is formed by the first sub-magnet 31a, the second sub-magnet 31a, the third sub-magnet 31a, the fourth sub-magnet 31a, and the rotor shaft 20. The fourth sub-magnet 31a abuts against the rotor shaft 20 at a position corresponding to the lower first channel 301, preventing the cooling medium from flowing out from the right side of the lower first channel 301, thereby improving the flow path of the cooling medium in the magnet assembly 31.

[0085] In some embodiments, such as Figure 1 and Figure 4 As shown, the sub-magnet 31a includes a mounting bracket and a magnetic component. The mounting bracket has multiple mounting slots, and the magnetic component is located in the mounting slots. Gaps will be generated between adjacent mounting brackets. During the flow of the cooling medium through the first channel 301, the second channel 302, and the third channel 303, the cooling medium will flow into the gaps through the first channel 301, the second channel 302, and the third channel 303.

[0086] In some embodiments, such as Figures 2 to 4 As shown, there are six fourth channels 306, which are located between the first channel 301 and the third channel 303. The six fourth channels 306 are evenly spaced along the circumferential direction of the rotor shaft 20. Each fourth channel 306 is connected to a second liquid discharge port 305 at both ends, so that the cooling medium can be discharged from both ends of the fourth channel 306.

[0087] In some embodiments, the second liquid ejection port 305 is cylindrical, and the axis of the second liquid ejection port 305 is the axis of the cylinder. The axis of the second liquid ejection port 305 forms an acute angle with the first direction X.

[0088] For example, the acute angle between the axis of the second liquid ejection port 305 and the first direction X can be set to any value among 30°, 35°, 40°, 45°, 50°, 55°, and 60° or any range between two values.

[0089] Optionally, embodiments of this application propose a drive mechanism including the rotor structure described in the above embodiments.

[0090] In this embodiment, the drive shaft 10 passes through the rotor shaft 20 along the first direction X, and a cooling chamber 201 is formed between the rotor shaft 20 and the drive shaft 10. The cooling chamber 201 is connected to the liquid inlet channel 101 of the drive shaft 10 and the liquid outlet hole 202 of the rotor shaft 20, so that the cooling medium can enter the cooling chamber 201 through the liquid inlet channel 101, thereby dissipating heat from the rotor shaft 20 and the drive shaft 10. Furthermore, the size of the cooling chamber 201 increases along the second direction Y from the end of the rotor shaft 20 to the liquid outlet hole 202. Thus, when the rotor shaft 20 rotates, the cooling medium in the cooling chamber 201 will be subjected to centrifugal force pointing towards the liquid outlet hole 202, thereby causing the cooling medium to converge towards the liquid outlet hole 202, preventing the cooling medium from leaking from the end gap of the rotor shaft 20, thereby improving the heat dissipation efficiency.

[0091] In some embodiments, the drive mechanism further includes a planetary assembly (not shown in the figure), with an external spline at the second end 204 of the rotor shaft 20. The planetary gears are connected to the external spline of the rotor shaft 20 and the end of the transmission shaft 10, respectively, thereby transmitting the power of the rotor shaft 20 to the output shaft.

[0092] In some embodiments, the drive mechanism further includes a stator assembly, which surrounds the outer periphery of the magnet assembly 31, and an air gap exists between the stator assembly and the magnet assembly 31. The stator assembly includes a stator core and a stator winding. The stator core has a stator yoke extending along a first direction X and a plurality of stator teeth. The plurality of stator teeth are spaced apart circumferentially on the inner periphery of the stator yoke, and a stator slot is formed between two adjacent stator teeth. The stator winding is embedded in the stator slot. Thus, when multiphase alternating current is applied to the stator winding, the alternating current in the stator winding generates a circumferentially varying composite magnetomotive force in the teeth and yoke of the stator core. The composite magnetomotive force forms a rotating magnetic field in the air gap. The magnetic components in the magnet assembly 31 generate a constant permanent magnet magnetic field. The permanent magnet magnetic field interacts with the rotating magnetic field generated by the stator winding in the air gap, thereby driving the rotor structure to rotate.

[0093] Optionally, embodiments of this application propose a powertrain that includes the rotor structure of the above embodiments, or the drive mechanism of the above embodiments.

[0094] In this embodiment, the drive shaft 10 passes through the rotor shaft 20 along the first direction X, and a cooling chamber 201 is formed between the rotor shaft 20 and the drive shaft 10. The cooling chamber 201 is connected to the liquid inlet channel 101 of the drive shaft 10 and the liquid outlet hole 202 of the rotor shaft 20, so that the cooling medium can enter the cooling chamber 201 through the liquid inlet channel 101, thereby dissipating heat from the rotor shaft 20 and the drive shaft 10. Furthermore, the size of the cooling chamber 201 increases along the second direction Y from the end of the rotor shaft 20 to the liquid outlet hole 202. Thus, when the rotor shaft 20 rotates, the cooling medium in the cooling chamber 201 will be subjected to centrifugal force pointing towards the liquid outlet hole 202, thereby causing the cooling medium to converge towards the liquid outlet hole 202, preventing the cooling medium from leaking from the end gap of the rotor shaft 20, thereby improving the heat dissipation efficiency.

[0095] Optionally, embodiments of this application propose a vehicle that includes the rotor structure of the above embodiments, or the drive mechanism of the above embodiments, or the powertrain of the above embodiments.

[0096] In this embodiment, the drive shaft 10 passes through the rotor shaft 20 along the first direction X, and a cooling chamber 201 is formed between the rotor shaft 20 and the drive shaft 10. The cooling chamber 201 is connected to the liquid inlet channel 101 of the drive shaft 10 and the liquid outlet hole 202 of the rotor shaft 20, so that the cooling medium can enter the cooling chamber 201 through the liquid inlet channel 101, thereby dissipating heat from the rotor shaft 20 and the drive shaft 10. Furthermore, the size of the cooling chamber 201 increases along the second direction Y from the end of the rotor shaft 20 to the liquid outlet hole 202. Thus, when the rotor shaft 20 rotates, the cooling medium in the cooling chamber 201 will be subjected to centrifugal force pointing towards the liquid outlet hole 202, thereby causing the cooling medium to converge towards the liquid outlet hole 202, preventing the cooling medium from leaking from the end gap of the rotor shaft 20, thereby improving the heat dissipation efficiency.

[0097] Specifically, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.

[0098] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0099] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor structure, characterized in that, Includes a rotor shaft (20) and a drive shaft (10); The drive shaft (10) passes through the rotor shaft (20) along the first direction (X), and a cooling chamber (201) is formed between the rotor shaft (20) and the drive shaft (10); the drive shaft (10) is provided with a liquid inlet channel (101), the rotor shaft (20) is provided with a liquid outlet hole (202), and the cooling chamber (201) is connected to the liquid inlet channel (101) and the liquid outlet hole (202) respectively; From the end of the rotor shaft (20) to the liquid outlet (202), the size of the cooling chamber (201) increases along the second direction (Y), where the first direction (X) is the axial direction of the rotor shaft (20) and the second direction (Y) is the radial direction of the rotor shaft (20).

2. The rotor structure according to claim 1, characterized in that, The rotor shaft (20) has a first end (203) and a second end (204) disposed opposite to each other along the first direction (X), and the liquid outlet (202) is located between the first end (203) and the second end (204); The size of the cooling cavity (201) increases along the second direction (Y) from the first end (203) to the liquid outlet (202); the size of the cooling cavity (201) increases along the second direction (Y) from the second end (204) to the liquid outlet (202).

3. The rotor structure according to claim 2, characterized in that, The liquid outlet (202) is provided in two sets, and the two sets of liquid outlet (202) are arranged at intervals along the first direction (X); Each set of liquid outlet holes (202) includes a plurality of liquid outlet holes (202) arranged circumferentially along the rotor shaft (20), and each liquid outlet hole (202) is connected to the cooling chamber (201).

4. The rotor structure according to claim 3, characterized in that, The drive shaft (10) is provided with a connecting hole (102); along the first direction (X), the connecting hole (102) is located between the two sets of liquid outlet holes (202), and the connecting hole (102) is connected to the liquid inlet channel (101) and the cooling chamber (201) respectively.

5. The rotor structure according to claim 4, characterized in that, The connecting holes (102) are provided in multiple ways; the multiple connecting holes (102) are arranged at intervals along the circumference of the transmission shaft (10), and the multiple connecting holes (102) are located between the two sets of liquid outlet holes (202).

6. The rotor structure according to claim 1, characterized in that, The rotor shaft (20) has a receiving cavity, and the transmission shaft (10) passes through the receiving cavity and surrounds the rotor shaft (20) to form the cooling cavity (201). The size of the receiving cavity increases along the second direction (Y) from the end of the rotor shaft (20) to the liquid outlet (202).

7. The rotor structure according to any one of claims 1-6, characterized in that, The rotor structure also includes a rotor core (30). The rotor core (30) is sleeved on the rotor shaft (20), and the rotor core (30) and the rotor shaft (20) enclose a first channel (301). The rotor core (30) is provided with a second channel (302) and a third channel (303). The first channel (301) and the third channel (303) extend along the first direction (X), and the second channel (302) extends along the second direction (Y). The first channel (301) is connected to the liquid outlet (202) and the second channel (302) respectively. One end of the third channel (303) is connected to the second channel (302), and the other end of the third channel (303) is connected to the external environment.

8. The rotor structure according to claim 7, characterized in that, The rotor core (30) is also provided with a first liquid ejection port (304). The first liquid ejection port (304) is located at the end of the third channel (303) away from the second channel (302), and the first liquid ejection port (304) is used to connect the third channel (303) and the external environment; the axis of the first liquid ejection port (304) is set at an acute angle to the first direction (X).

9. The rotor structure according to claim 8, characterized in that, The first channel (301), the second channel (302), the third channel (303) and the first liquid ejection port (304) are each provided with multiple channels; The plurality of first channels (301) and the plurality of third channels (303) are all arranged circumferentially along the rotor shaft (20), and the plurality of third channels (303) are located on the outer periphery of the plurality of first channels (301); Each of the first channels (301) is connected to one of the liquid outlets (202) and one of the second channels (302), and each of the third channels (303) is connected to one of the second channels (302) and one of the first liquid ejection ports (304).

10. The rotor structure according to claim 9, characterized in that, Along the circumference of the rotor shaft (20), the extension directions of two adjacent first channels (301) are opposite, and two adjacent first liquid ejection ports (304) are respectively disposed on both sides of the rotor core (30) along the first direction (X), and the two adjacent first liquid ejection ports (304) are staggered from each other.

11. The rotor structure according to claim 9, characterized in that, The third channel (303) includes at least two sub-channels (303a); At least two of the sub-channels (303a) extend along the first direction (X), one end of each sub-channel (303a) is connected to the second channel (302), and the other end of each sub-channel (303a) is connected to the first liquid ejection port (304).

12. The rotor structure according to claim 9, characterized in that, The rotor core (30) includes a magnet assembly (31) and two end plates (32). The magnet assembly (31) is sleeved on the rotor shaft (20), and the two end plates (32) are respectively disposed on both sides of the magnet assembly (31) along the first direction (X). The magnet assembly (31) and the rotor shaft (20) enclose to form the first channel (301), and the magnet assembly (31) and the end plates (32) enclose to form the second channel (302). The magnet assembly (31) is provided with the third channel (303), which penetrates the magnet assembly (31). Each end plate (32) has the first liquid ejection port (304).

13. The rotor structure according to claim 12, characterized in that, The magnet assembly (31) includes a plurality of sub-magnets (31a); Multiple sub-magnets (31a) are stacked along the first direction (X), and there is a gap between two adjacent sub-magnets (31a); the magnet assembly (31) is provided with a fourth channel (306) that runs through the first direction (X), and the end plate (32) is provided with a second liquid ejection port (305). The fourth channel (306) connects the gap and the second liquid ejection port (305).

14. A driving mechanism, characterized in that, The rotor structure includes any one of claims 1-13.

15. A powertrain, characterized in that, It includes the rotor structure according to any one of claims 1-13, or the drive mechanism according to claim 14.

16. A vehicle, characterized in that, It includes the rotor structure of any one of claims 1-13, or the drive mechanism of claim 14, or the powertrain of claim 15.

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