Axially fixed rotor, driving motor and power assembly

Abstract

The utility model relates to the technical field of motors, in particular to an axially fixed rotor, a driving motor and a power assembly. The rotor comprises a plurality of rotor iron cores, a rotor end plate and one or more connecting pieces. Each rotor iron core comprises a plurality of cooling holes for circulating cooling oil, each cooling hole is communicated with two axial end surfaces of the plurality of rotor iron cores, and the plurality of rotor iron cores are sequentially and adjacently arranged along the axial direction of the rotor; the plurality of cooling holes of each rotor iron core are respectively communicated with the plurality of cooling holes of the adjacent rotor iron core to form a plurality of axial flow channels; the rotor end plate is arranged on one side of the plurality of rotor iron cores along the axial direction of the rotor. In the axial direction of the rotor, one part of each connecting piece is embedded into one axial flow channel, and one end, extending out of one axial flow channel, of each connecting piece is fixed to one rotor end plate. The iron core structure of the rotor is more stable, and the heat dissipation effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an axially fixed rotor, a driving motor and a power assembly. BACKGROUND

[0002] With the development of new energy vehicles, the motor in the power assembly of the electric vehicle is developing towards high speed, high density and miniaturization.

[0003] The rotor is one of the core components of the motor, and the rotor rotates at high speed during the operation of the motor. The stability of the rotor structure will affect the service life and working state of the motor. CONTENT OF THE INVENTION

[0004] The present application provides an axially fixed rotor, a driving motor and a power assembly. The core structure of the rotor is more stable, and the heat dissipation effect is better.

[0005] In a first aspect, the present application provides an axially fixed rotor. The rotor comprises a plurality of rotor cores, a rotor end plate and one or more connecting pieces. Each rotor core comprises a plurality of cooling holes for circulating cooling oil. Each cooling hole is connected to two axial end faces of the plurality of rotor cores. The plurality of rotor cores are arranged in sequence along the axial direction of the rotor. The plurality of cooling holes of each rotor core are connected to the plurality of cooling holes of the adjacent rotor core to form a plurality of axial flow channels. The rotor end plate is arranged on one side of the plurality of rotor cores along the axial direction of the rotor. Wherein: along the axial direction of the rotor, a part of each connecting piece is embedded in an axial flow channel, and one end of each connecting piece protruding from the axial flow channel is fixed to the rotor end plate.

[0006] The above-mentioned rotor is axially fixed by one or more connecting pieces, which can prevent the rotor core from loosening along the axial direction of the rotor. Each connecting piece is arranged in the axial flow channel in the rotor, which can save space in the rotor. The connecting piece can also use its own structure to carry away the heat of the rotor core, thereby optimizing the oil cooling effect of the rotor. When the rotor rotates at high speed, the structure can remain stable and not deformed, which is beneficial to improve the performance of the motor.

[0007] In one embodiment, along the radial direction of the rotor, each connecting piece comprises an embedded segment arranged in an axial flow channel. Along the radial direction of the rotor, the radial height of the embedded segment is less than the radial height of the axial flow channel, and the distance between the embedded segment and the end of the axial flow channel facing the center of the rotor is less than the distance between the embedded segment and the end of the axial flow channel away from the center of the rotor. The connecting piece is closer to the side of the rotor center, which reduces the influence on the heat dissipation of the cooling oil in the axial flow channel.

[0008] In one embodiment, the circumferential width of the one embedded section is less than the circumferential width of the one axial flow channel along the circumferential direction of the rotor. The embedded section occupies space reserved for cooling oil flow on both sides of the axial flow channel in the circumferential direction, reducing the impact on the heat dissipation of the cooling oil.

[0009] In one embodiment, the one embedded section is not in contact with both ends of the one axial flow channel along the circumferential direction of the rotor, and the embedded section is kept in the middle position of the axial flow channel, reducing the impact on the heat dissipation of the oil cooling.

[0010] In one embodiment, the one rotor end plate includes one or more fixing holes, each fixing hole is connected to an end surface of a rotor end plate facing a rotor core, and each connecting piece exposes one end of an axial flow channel through a fixing hole to be fixed to the side of the one rotor end plate away from the plurality of rotor cores; along the radial direction of the rotor, the radial height of each fixing hole is less than the radial height of each axial flow channel, and the fixing hole can limit the radial position of the connecting piece, adjust the radial position of the connecting piece relative to the axial flow channel, so that the connecting piece is located on the side of the axial flow channel close to the center of the rotor, reducing the impact of the connecting piece on the cooling oil in the axial flow channel.

[0011] In one embodiment, the distance between each fixing hole and the axis of the rotor is greater than or equal to the distance between the axial flow channel and the axis of the rotor, and the distance between each fixing hole and the outer circumferential surface of the rotor is greater than the distance between the axial flow channel and the outer circumferential surface of the rotor. The connecting piece can be limited to the side of the axial flow channel close to the center of the rotor, and the cooling oil in the axial flow channel can be more distributed on the side close to the outer circumferential surface of the rotor, improving the cooling effect.

[0012] In one embodiment, the part of each connecting piece exposed through a fixing hole of a rotor end plate covers at least part of the surface of a rotor end plate away from the plurality of rotor cores. The part of each connecting piece exposed through a fixing hole of a rotor end plate is arranged adjacent to the rotor end plate along the axial direction of the rotor, and this part of the connecting piece can limit the movement of the connecting piece from the rotor end plate to the side of the plurality of rotor cores, achieving axial positioning of the rotor end plate and the plurality of rotor cores.

[0013] In one embodiment, the rotor includes a plurality of locking pieces, each locking piece is arranged on the side of the one rotor end plate away from the plurality of rotor cores along the axial direction of the rotor and partially covers the surface of the one rotor end plate away from the plurality of rotor cores, and the part of the connecting piece exposed through the one rotor end plate is connected to one locking piece. The locking piece can limit the movement of the connecting piece from the rotor end plate to the side of the plurality of rotor cores, achieving axial positioning of the rotor end plate and the plurality of rotor cores.

[0014] In one embodiment, the one rotor end plate comprises a plurality of oil outlet holes, each of which communicates two end faces of the one rotor end plate to communicate an axial flow channel; each connecting piece extends through an oil outlet hole at one end of an axial flow channel to be fixed to the one side of the rotor end plate away from the plurality of rotor cores; each oil outlet hole comprises a first hole section and a second hole section which are communicated along a first direction, the first hole section is used to accommodate the connecting piece, and the second hole section and the first hole section communicate an axial flow channel along the axial direction of the rotor, and the first direction is the radial direction of the rotor or the circumferential direction of the rotor; along the first direction, the length of the oil outlet hole is greater than the length of the axial flow channel. The oil outlet hole has the functions of fixing the connecting piece and oil injection, which can simplify the structure and process difficulty of the rotor.

[0015] In one embodiment, the hole wall of the oil outlet hole comprises two protrusions which are opposite along a second direction, and the second direction is perpendicular to the first direction; the two protrusions are arranged between the first hole section and the second hole section along the first direction, and the distance between the two protrusions is less than the outer diameter of the connecting piece accommodated in the first hole section. The two protrusions can limit the connecting piece accommodated in the first hole section to prevent the connecting piece from shifting to the second hole section.

[0016] In one embodiment, the oil outlet hole further comprises a third hole section which is communicated with the first hole section away from the second hole section along the first direction. The first hole section is used for the connecting piece to pass through, and the second hole section and the third hole section are used for oil injection, which can optimize the oil injection mode and cooling effect.

[0017] In one embodiment, the third hole section and the second hole section have the same shape, and the second hole section and the third hole section are symmetrically distributed about the first hole section, which can optimize the oil injection state.

[0018] In one embodiment, along the radial direction of the rotor, the distance between the first hole section and the axis of the rotor is less than or equal to the distance between the second hole section and the axis of the rotor. The first hole section can limit the connecting piece as much as possible to the side of the axial flow channel closer to the center of the rotor, thereby reducing the influence on the cooling oil in the axial flow channel.

[0019] In one embodiment, the end face of the one rotor end plate away from the one rotor core comprises a central groove; along the radial direction of the rotor, the part of each connecting piece exposed to the rotor end plate is arranged between the outer diameter of the central groove and the central hole of the one rotor end plate; along the axial direction of the rotor, the axial height of each connecting piece exposed to the rotor end plate is less than the groove depth of the central groove, which is conducive to reducing the axial size of the rotor.

[0020] In one embodiment, the rotor comprises another rotor end plate arranged axially along the rotor on the other side of the plurality of rotor cores; each connecting piece extends out of the axial flow channel towards the opening of the other rotor end plate and is fixed to the other rotor end plate. The two ends of each connecting piece are fixed to the two rotor end plates respectively, so that the two rotor end plates and the plurality of rotor cores are axially fixed, preventing the plurality of rotor cores from loosening.

[0021] In a second aspect, the embodiments of the present application provide a drive motor, which comprises a stator and any one of the rotors provided in the first aspect, and the stator comprises a central hole, and the rotor is assembled in the central hole.

[0022] In a third aspect, the embodiments of the present application provide a power assembly, which can be applied to an electric vehicle. The power assembly comprises a speed reducer and any one of the drive motors provided in the second aspect, and the drive motor is used to drive the wheels of the electric vehicle through the speed reducer. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic diagram of an electric vehicle provided by the embodiments of the present application;

[0024] Figure 2 A structural schematic diagram of a power assembly provided by the embodiments of the present application;

[0025] Figure 3 A sectional structural schematic diagram of a drive motor provided by the embodiments of the present application;

[0026] Figure 4 A structural schematic diagram of a rotor provided by the embodiments of the present application;

[0027] Figure 5 A structural schematic diagram of the cooperation between a rotor core and a connecting piece of a rotor provided by the embodiments of the present application;

[0028] Figure 6a A partial structural sectional schematic diagram of a rotor provided by the embodiments of the present application;

[0029] Figure 6b A partial structural sectional schematic diagram of a rotor provided by the embodiments of the present application;

[0030] Figure 7a A partial structural sectional schematic diagram of a rotor provided by the embodiments of the present application;

[0031] Figure 7b A partial structural sectional schematic diagram of a rotor provided by the embodiments of the present application;

[0032] Figure 7c A partial structural sectional schematic diagram of a rotor provided by the embodiments of the present application;

[0033] Figure 8 A partial structural section view of a rotor provided for an embodiment of the present application;

[0034] Figure 9 A section view of a rotor provided for an embodiment of the present application;

[0035] Figure 10a A structural view of a rotor provided for an embodiment of the present application;

[0036] Figure 10b An exploded view of a rotor provided for an embodiment of the present application;

[0037] Figure 11 A partial structural view of a rotor provided for an embodiment of the present application;

[0038] Figure 12a A structural view of a rotor end plate of a rotor provided for an embodiment of the present application;

[0039] Figure 12b A structural view of an oil outlet hole of a rotor end plate of a rotor provided for an embodiment of the present application;

[0040] Figure 13 A partial structural view of a rotor provided for an embodiment of the present application;

[0041] Figure 14a A structural view of a rotor end plate of a rotor provided for an embodiment of the present application;

[0042] Figure 14b A structural view of an oil outlet hole of a rotor end plate of a rotor provided for an embodiment of the present application.

[0043] Reference signs:

[0044] 1000 - power assembly; 2000 - transmission mechanism; 3000 - wheel;

[0045] 100 - motor; 200 - motor controller; 300 - speed reducer;

[0046] 10 - rotor; 20 - stator; 201 - stator core; 202 - stator winding; 30 - housing;

[0047] 1-rotor shaft; 2-rotor core; 21-cooling hole; 22-center hole; 23-magnetic steel hole; 3-rotor end plate; 31-fixing hole; 32-oil outlet hole; 321-first hole section; 322-second hole section; 323-third hole section; 33-center groove; 4-fixing member; 4a-ring structure member; 4b-ring shoulder; 5-magnetic steel; 6-connecting member; 61-embedded section; 62, 62a, 62b-fixing section; 7-locking member; 8-rotor sleeve;

[0048] d1-oil inlet channel; d2-axial flow channel; d3-oil guide channel; S-power output end; T-protrusion. DETAILED DESCRIPTION

[0049] The motor includes a stator and a rotor, and the rotor can rotate in a magnetic field formed by the center hole of the stator to output power. In the prior art, the rotating speed of the motor can be as high as 20,000-60,000 revolutions per minute, and the rotor structure needs to maintain good structural stability under strong centrifugal force, otherwise the service life and working state of the motor will be affected.

[0050] Based on this, the embodiments of the present application provide an axially fixed rotor, a driving motor and a power assembly, the rotor is axially fixed through a connecting member sharing an oil cooling channel, which can strengthen the structural stability of the rotor and improve the heat dissipation effect of the rotor

[0051] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be described in further detail below with reference to the drawings.

[0052] Figure 1 A structural schematic diagram of an electric vehicle provided by the embodiments of the present application is shown in FIG. 1, which can be a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV) or a plug-in hybrid electric vehicle (PHEV), etc. The electric vehicle includes a power assembly 1000, a transmission mechanism 2000 and wheels 3000. The power assembly 1000 is used to convert electric energy into mechanical energy, the transmission mechanism 2000 is drivingly connected to the power assembly 1000 and the wheels 3000, and can transmit the kinetic energy output by the power assembly to the wheels 3000 to drive the wheels to rotate. Of course, the electric vehicle also includes a vehicle frame bearing the internal and external environmental loads of the vehicle and a battery used to supply power to the power assembly 1000, which is not shown here. Figure 1 d1-oil inlet channel; d2-axial flow channel; d3-oil guide channel; S-power output end; T-protrusion. DETAILED DESCRIPTION

[0049] The motor includes a stator and a rotor, and the rotor can rotate in a magnetic field formed by the center hole of the stator to output power. In the prior art, the rotating speed of the motor can be as high as 20,000-60,000 revolutions per minute, and the rotor structure needs to maintain good structural stability under strong centrifugal force, otherwise the service life and working state of the motor will be affected.

[0050] Based on this, the embodiments of the present application provide an axially fixed rotor, a driving motor and a power assembly, the rotor is axially fixed through a connecting member sharing an oil cooling channel, which can strengthen the structural stability of the rotor and improve the heat dissipation effect of the rotor

[0051] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be described in further detail below with reference to the drawings.

[0052] Figure 1 A structural schematic diagram of an electric vehicle provided by the embodiments of the present application is shown in FIG. 1, which can be a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV) or a plug-in hybrid electric vehicle (PHEV), etc. The electric vehicle includes a power assembly 1000, a transmission mechanism 2000 and wheels 3000. The power assembly 1000 is used to convert electric energy into mechanical energy, the transmission mechanism 2000 is drivingly connected to the power assembly 1000 and the wheels 3000, and can transmit the kinetic energy output by the power assembly to the wheels 3000 to drive the wheels to rotate. Of course, the electric vehicle also includes a vehicle frame bearing the internal and external environmental loads of the vehicle and a battery used to supply power to the power assembly 1000, which is not shown here.

[0053] Figure 2 This is a schematic diagram of the powertrain 1000 provided in an embodiment of this application. Figure 2 As shown, the powertrain 1000 includes a drive motor 100 and a motor controller 200. The motor controller 200 converts the direct current (DC) power supplied by the battery into alternating current (AC) power and supplies the AC power to the drive motor 100. In one embodiment, the powertrain 1000 further includes a reducer 300, through which the power output of the drive motor 100 is connected to the vehicle's wheels 3000. The reducer 300 can also be referred to as a transmission.

[0054] Figure 3 This is a schematic cross-sectional view of a drive motor 100. (See attached diagram.) Figure 3 As shown, the drive motor 100 includes a rotor 10, a stator 20, and a housing 30, with the stator 20 and a portion of the rotor 10 housed within the housing 30. In one embodiment, the stator 20 is fixed circumferentially within the housing 30, and the rotor 10 is rotatably mounted within the central hole of the stator 20. One end of the rotor 10 extends axially from within the housing 30 to form the power output terminal S of the drive motor 100. The stator 20 includes a stator core 201 and a stator winding 202 wound around the stator core 201. When the stator winding 202 is energized, a magnetic field is generated in the central hole of the stator core 201, allowing the rotor 10 to rotate around its axis within the magnetic field.

[0055] In this embodiment of the application, cooling oil is introduced into the drive motor 100 of the electric vehicle to exchange heat with the drive motor 100, which can cool the drive motor 100 and improve the motor performance.

[0056] In one embodiment, an oil-cooling circuit is formed inside the rotor 10 of the drive motor 100. Cooling oil is introduced into the oil-cooling circuit within the rotor 10 to perform liquid cooling heat dissipation on the rotor 10. Finally, the cooling oil can be sprayed out from the two axial ends of the rotor 10. Here, the axial direction of the rotor and the axial direction of the drive motor refer to the same direction; the circumferential direction of the rotor and the circumferential direction of the drive motor refer to the same direction; and the radial direction of the rotor and the radial direction of the drive motor refer to the same direction. For ease of understanding, the axial direction of the drive motor 100 is represented by the letter A, the radial direction by the letter R, and the circumferential direction by the letter C.

[0057] Figure 4Figure 1 is a schematic view of a cross section of a rotor 10 according to an embodiment of the present application. The rotor 10 includes a rotor shaft 1, a plurality of rotor cores 2, two rotor end plates 3, and two fixing members 4. The plurality of rotor cores 2 are arranged in sequence along the axial direction of the rotor 10, the two rotor end plates 3 are arranged on the two sides of the plurality of rotor cores 2, the rotor shaft 1 passes through one rotor end plate 3, the plurality of rotor cores 2, and the other rotor end plate 3 in sequence, and the two rotor end plates 3 and the plurality of rotor cores 2 are fixed to the rotor shaft 1 in the form of key groove matching in the circumferential direction. One of the two fixing members 4 is arranged on the side of one of the two rotor end plates 3 away from the plurality of rotor cores 2 along the axial direction of the rotor 10, the other of the two fixing members 4 is arranged on the side of the other of the two rotor end plates 3 away from the plurality of rotor cores 2 along the axial direction of the rotor 10, and the two fixing members 4 can axially limit the plurality of rotor cores 2 and the two rotor end plates 3 along the axial direction of the rotor 10.

[0058] In an embodiment, please continue to refer to Figure 4 In an embodiment, each of the rotor cores 2 includes a plurality of cooling holes 21 for flowing cooling oil. Each of the cooling holes 21 is communicated with the two axial end faces of the rotor core 2 along the axial direction of the rotor 10. When the plurality of rotor cores 2 are arranged in sequence along the axial direction of the rotor 10, the plurality of cooling holes 21 of each of the rotor cores 2 can be communicated with the plurality of cooling holes 21 of the adjacent rotor cores 2 to form a plurality of axial channels d2. Each of the cooling holes 21 of each of the rotor cores 2 can be communicated with another cooling hole 21 of the adjacent rotor core 2 to form at least part of an axial channel d2. For the overall structure of the plurality of rotor cores 2, each of the axial channels d2 can be communicated with the two end faces of the plurality of rotor cores 2.

[0059] In an embodiment, the rotor shaft 1 includes an oil inlet channel d1 for supplying oil to the inside of the rotor 10, and the oil inlet channel d1 is distributed on the rotor shaft 1. In an embodiment, the oil inlet channel d1 includes a plurality of outlets distributed in the circumferential direction of the rotor 10, and each of the outlets is used for supplying oil to the plurality of axial flow channels d2 of the rotor core 2. By supplying oil to the plurality of rotor cores 2 by the rotor shaft 1, the cooling oil can be supplied to the plurality of rotor cores 2 in an axial uniform manner.

[0060] In an embodiment, one of the rotor end plates 3 includes a plurality of oil guide channels d3 for transmitting the cooling oil in the oil inlet channel d1 to the plurality of axial channels d2. Each of the oil guide channels d3 is communicated between the oil inlet channel d1 and one of the axial channels d2 along the radial direction of the rotor 10.

[0061] In one embodiment, the rotor 10 further comprises one or more connecting pieces 6. A portion of each connecting piece 6 is embedded in an axial flow channel d2, and one end of the connecting piece 6 extends out of one end of the plurality of rotor cores 2 along the axial direction of the driving motor to be fixed to one rotor end plate 3. The connecting piece 6 is fixedly connected with the rotor end plate 3, which can be used to axially limit the plurality of rotor cores 2 to prevent the plurality of rotor cores 2 from loosening along the axial direction of the driving motor, so that the rotor 10 can maintain structural stability and not deform when rotating at high speed. At least a portion of each connecting piece 6 is embedded in the axial flow channel d2 formed by the plurality of rotor cores 2, and the connecting piece 6 is arranged in the space of the axial flow channel d2, so that more holes and slots do not need to be opened in the rotor core 2, thereby avoiding the problem of excessive stress caused by the opening of more holes and slots in the rotor core 2. The connecting piece 6 can also cooperate with the cooling oil to dissipate heat from the plurality of rotor cores 2, thereby improving the heat dissipation effect of the rotor 10.

[0062] In one embodiment, for ease of understanding, please continue to refer to Figure 4 As shown in FIG. 6, the connecting piece 6 comprises an embedded segment 61 embedded in the axial flow channel d2 and a fixed segment 62 extending out of the axial flow channel d2, and the fixed segment 62 is used to be fixed to the corresponding rotor end plate 3. The embedded segment 61 and the fixed segment 62 of the connecting piece 6 are of an integrated structure, and for ease of understanding, Figure 4 The embedded segment 61 and the fixed segment 62 in FIG. 6 are schematically divided by a dashed line in structure.

[0063] In one embodiment, the other end of each connecting piece 6 extends out of the other end of the plurality of rotor cores 2 along the axial direction of the rotor to be fixed to the other rotor end plate 3. It can be considered that each connecting piece 6 can be partially embedded in an axial flow channel d2, and both ends of each connecting piece 6 extend out of the axial flow channel d2, i.e., both ends of each connecting piece 6 extend out of both end faces of the plurality of rotor cores 2 and are fixed to both rotor end plates 3. Through the fixed connection of the connecting piece 6 and the two rotor end plates 3, the plurality of rotor cores 2 can be axially limited and fixed along the axial direction of the driving motor to prevent the plurality of rotor cores 2 from loosening along the axial direction of the driving motor. Correspondingly, the connecting piece 6 comprises an embedded segment 61 and two fixed segments 62, and the two fixed segments 62 are arranged at both ends of the embedded segment 61 along the axial direction of the rotor, and each fixed segment 62 is used to be fixed to one rotor end plate 3.

[0064] In one embodiment, after the embedded segment 61 of one connecting piece 6 is embedded in an axial flow channel d2, the embedded segment 61 occupies the internal space of the axial flow channel d2. In order to ensure the smooth flow of the cooling oil in the axial flow channel d2, along the radial direction of the rotor, the radial height of the embedded segment 61 is less than the radial height of the axial flow channel d2, and the internal space of the axial flow channel d2 at least reserves a space for the flow of the cooling oil in the radial direction of the rotor.

[0065] In one embodiment, the circumferential width of the embedded section 61 along the rotor is smaller than the circumferential width of the axial flow channel d2, and the internal space of the axial flow channel d2 is reserved at least in the circumferential direction of the rotor 10 for the flow of cooling oil.

[0066] In one embodiment, such as Figure 5 The diagram shows the structure of a rotor core 2. Each rotor core 2 includes a central hole 22, multiple cooling holes 21, and multiple magnet holes 23. Each magnet hole 23 is used to assemble magnets, and each cooling hole 21 is used for the flow of cooling oil. The central hole 22 extends through the rotor core 2 along the rotor's axial direction, and each magnet hole 23 extends through the rotor core 2 along the rotor's axial direction. The multiple magnet holes 23 are arranged at intervals around the central hole 22. When each magnet hole 23 is equipped with magnets, the multiple magnets arranged at intervals around the central hole 22 can form a ring-shaped rotor magnetic field for coupling with the stator magnetic field of the stator 20. Each cooling hole 21 is arranged at intervals between two magnet holes 23 along the rotor's circumference. Each cooling hole 21 is used to communicate with a cooling hole 21 of another rotor core 2 to form an axial flow channel d2. When a connector 6 is embedded in an axial flow channel d2, the embedding section 61 of the connector 6 embeds into the multiple cooling holes 21 included in the axial flow channel d2.

[0067] Figure 5 The embedded segment 61 of the connector 6 embedded in each cooling hole 21 is illustrated by shading. In one embodiment, taking one cooling hole 21 as an example, the embedded segment 61 is located radially towards the side of the cooling hole 21 facing the central hole 22. Specifically, the distance between the embedded segment 61 and the end c1 of the cooling hole 21 facing the center of the rotor 10 is less than the distance c2 between the embedded segment 61 and the end c2 of the cooling hole 21 away from the center of the rotor 10. The shape of the cooling hole 21 is not limited, and the end c1 of the cooling hole 21 facing the central hole 22 and the end c2 of the cooling hole 21 away from the central hole 22 are opposite each other radially to the rotor. This cooling hole 21 is part of an axial flow channel d2; it can also be considered that the distance between the embedded segment 61 and the end c1 of the axial flow channel d2 facing the center of the rotor 10 is less than the distance c2 between the embedded segment 61 and the end c2 of the axial flow channel d2 away from the center of the rotor 10. During the rotation of rotor 10, the cooling oil in cooling hole 21 is concentrated towards the end c2 of cooling hole 21 away from center hole 22 under the action of centrifugal force. The embedded section 61 embedded in cooling hole 21 is close to the side of cooling hole 21 facing center hole 22, which can reduce the interference of embedded section 61 on cooling oil flow and heat exchange, and optimize the cooling effect of cooling oil.

[0068] In one embodiment, along the radial direction of the drive motor, an embedded segment 61 with a cooling hole 21 abuts against the wall of the cooling hole 21 facing the central hole 22, and the cooling hole 21 can provide radial support for the embedded segment 61.

[0069] In one embodiment, the embedded section 61 of the cooling hole 21 is not in contact with the circumferential ends of the cooling hole 21 along the circumferential direction of the driving motor, so that the embedded section 61 is located as close to the middle of the cooling hole 21 as possible, reducing the obstruction to the flow of the cooling oil and reducing the influence on the oil cooling effect.

[0070] In one embodiment, one of the two rotor end plates 3 includes a plurality of fixing holes 31, each of which communicates with both axial end faces of the rotor end plate 3, and one end of each of the connecting members 6 is fixed to the one rotor end plate 3 on the side facing away from the plurality of rotor cores 2 along the axial direction of the rotor, and the one rotor end plate 3 can be used to axially position one end of the connecting member 6. When one end of the connecting member 6 is fixed through a fixing hole 31, the fixing hole 31 can be used to radially and circumferentially position the connecting member 6.

[0071] As shown in Figure 6a , for example, one of the two rotor end plates 3 includes a plurality of fixing holes 31, each of which corresponds to an axial flow channel d2 along the axial direction of the rotor. One fixed section 62 of one connecting member 6 passing through the axial flow channel d2 is fixed to the one rotor end plate 3 on the side facing away from the plurality of rotor cores 2 through the fixing hole 31.

[0072] In one embodiment, as shown in Figure 6a , along the radial direction of the rotor, the radial height of each fixing hole 31 is less than the radial height of the axial flow channel d2, and the position of the fixing hole 31 can limit the position of the connecting member 6 in the axial flow channel d2 along the radial direction of the rotor. By positioning the fixing hole 31 relative to the axial flow channel d2 in the radial direction, the connecting member 6 is positioned on the side of the axial flow channel d2 close to the center of the rotor 10, reducing the influence of the connecting member 6 on the cooling oil in the axial flow channel d2.

[0073] In one embodiment, as shown in Figure 6a , along the radial direction of the rotor, the distance h2 between each fixing hole 31 and the axis Q of the rotor 10 is greater than or equal to the distance h1 between the axial flow channel d2 and the axis Q of the rotor 10, and the distance h3 between each fixing hole 31 and the outer circumferential surface of the rotor 10 is greater than the distance h4 between the axial flow channel d2 and the outer circumferential surface of the rotor 10, so that the fixed section 62 of the connecting member 6 can smoothly pass through the fixing hole 31, and the position of the fixing hole 31 can limit the position of the connecting member 6 along the radial direction of the rotor.

[0074] In order to position the embedded section 61 of the connecting member 6 closer to the side of the cooling hole 21 facing the axis of the rotor 10 along the radial direction of the rotor, as shown in Figure 6aAs shown, in one embodiment, the difference between the distance h3 between each fixing hole 31 and the outer circumferential surface of the rotor 10 and the distance h4 between the axial flow channel d2 and the outer circumferential surface of the rotor 10 is greater than the difference between the distance h2 between each fixing hole 31 and the axis Q of the rotor 10 and the distance h1 between the axial flow channel d2 and the axis Q of the rotor 10.

[0075] In one embodiment, each connecting piece 6 exposes a portion of a rotor end plate 3 through a fixing hole 31, which covers at least a portion of the surface of the one rotor end plate 3 facing away from the plurality of rotor cores 2. Figure 6a As shown, one connecting piece 6 and one rotor end plate 3, the fixing section 62 of the connecting piece 6 exposes a portion of the rotor end plate 3, which covers at least a portion of the surface of the rotor end plate 3 facing away from the plurality of rotor cores 2, so that a portion of the one fixing section 62 is arranged along the axial direction of the rotor on the side of the rotor end plate 3 facing away from the plurality of rotor cores 2, and the rotor end plate 3 can limit the axial movement of the connecting piece 6 along the axial direction of the rotor.

[0076] In one embodiment, along the radial direction of the rotor, the radial height of the portion of the rotor end plate 3 exposed by the fixing section 62 of the connecting piece 6 is greater than the radial height of the fixing hole 31. Alternatively, along the circumferential direction of the rotor, the circumferential length of the portion of the rotor end plate 3 exposed by the fixing section 62 of the connecting piece 6 is greater than the circumferential length of the fixing hole 31. The portion of the rotor end plate 3 exposed by the one fixing section 62 of the connecting piece 6 can be arranged along the axial direction of the rotor on the side of the rotor end plate 3 facing away from the plurality of rotor cores 2 and cannot pass through the fixing hole 31, thereby preventing the connecting piece 6 from moving along the axial direction of the rotor from the rotor end plate 3 to the side of the plurality of rotor cores 2 and falling out, and being able to limit the axial movement of the rotor end plate 3 and the plurality of rotor cores 2.

[0077] In one embodiment, as shown, Figure 6b As shown, the rotor 10 includes a plurality of locking pieces 7, each locking piece 7 is arranged along the axial direction of the rotor on the side of one rotor end plate 3 facing away from the plurality of rotor cores 2 and partially covers the surface of one rotor end plate 3 facing away from one of the plurality of rotor cores 2, and the connecting piece 6 is connected to one locking piece 7 through one fixing hole 31.

[0078] In one embodiment, the radial height of the locking member 7 is greater than the radial height of the fixing hole 31 along the radial direction of the rotor. Alternatively, the circumferential length of the locking member 7 is greater than the circumferential length of the fixing hole 31 along the circumferential direction of the rotor. Alternatively, a portion of the locking member 7 is fixed to the side of the rotor end plate 3 opposite to the plurality of rotor cores 2. The locking member 7 can be arranged along the axial direction of the rotor on the side of the rotor end plate 3 opposite to the plurality of rotor cores 2 and cannot pass through the fixing hole 31. When one end of the connecting member 6 is connected and fixed to the locking member 7, the locking member 7 can prevent the connecting member 6 from moving along the axial direction of the rotor from the rotor end plate 3 to the side of the plurality of rotor cores 2 and dislodging, thereby axially limiting the rotor end plate 3 and the plurality of rotor cores 2.

[0079] In one specific embodiment, a portion of the fixed section 62 of the connector 6 protruding from the rotor end plate 3 is threadedly connected to the locking member 7. Alternatively, a portion of the fixed section 62 of the connector 6 protruding from the rotor end plate 3 is snap-fitted to the locking member 7.

[0080] Combination Figure 6a and Figure 6b As shown, for the entire rotor 10, there are several possible implementations for fixing both ends of a connector 6 to the two rotor end plates 3. See also... Figure 7a to Figure 7c As shown, with the entire rotor 10 as a reference, the connection method between the connector 6 and the two rotor end plates 3 is described exemplarily. In one embodiment, the two rotor end plates 3 of the rotor 10 are a first end plate 3a and a second end plate 3b, which are arranged along the axial direction of the rotor on both sides of a plurality of rotor cores 2. Each connector 6 includes an insert section 61 and two fixing sections 62 connected to the insert section 61, wherein one fixing section 62 is a first fixing section 62a fixed to the first end plate 3a, and the other fixing section 62 is a second fixing section 62b fixed to the second end plate 3b.

[0081] In one embodiment, such as Figure 7a As shown, a first fixing section 62a of a connector 6 passes through the fixing hole 31 included in the first end plate 3a and protrudes from the side of the first end plate 3a facing away from the plurality of rotor cores 2. The first fixing section 62a at least covers a portion of the surface of the first end plate 3a facing away from the plurality of rotor cores 2. The second fixing section 62b of the connector 6 is fixed to the second end plate 3b by means of threaded connection, welding, bonding, etc.

[0082] In one embodiment, such as Figure 7bAs shown in FIG. 1, the first fixing section 62a of the connecting member 6 passes through the fixing hole 31 included in the first end plate 3a and exposes a portion of the first end plate 3a facing away from the plurality of rotor cores 2, and the first fixing section 62a covers at least a portion of the surface of the first end plate 3a facing away from the plurality of rotor cores 2. The second fixing section 62b of the connecting member 6 passes through the fixing hole 31 included in the second end plate 3b and exposes a portion of the second end plate 3b facing away from the plurality of rotor cores 2, and the portion of the second end plate 3b exposed by the second fixing section 62b is fixedly connected to the locking member 7.

[0083] In one embodiment, as shown in FIG. 1, at least one of the two rotor end plates 3 includes a plurality of oil outlet holes 32, each of which is in communication with an axial flow passage d2 and is configured to guide the cooling oil in the axial flow passage d2 to be sprayed out of the axial end of the rotor 10. Each of the fixing holes 31 is also in communication with an axial flow passage d2. In one embodiment, one of the oil outlet holes 32 and one of the fixing holes 31 are in communication with the same axial flow passage d2, and each of the fixing holes 31 avoids the oil outlet hole 32. For the same axial flow passage d2, the oil outlet hole 32 and the fixing hole 31 in communication with the axial flow passage d2 are independent of each other. Figure 7c In one embodiment, as shown in FIG. 1, at least one of the two rotor end plates 3 includes a plurality of oil outlet holes 32, each of which is in communication with an axial flow passage d2 and is configured to guide the cooling oil in the axial flow passage d2 to be sprayed out of the axial end of the rotor 10. Each of the fixing holes 31 is also in communication with an axial flow passage d2. In one embodiment, one of the oil outlet holes 32 and one of the fixing holes 31 are in communication with the same axial flow passage d2, and each of the fixing holes 31 avoids the oil outlet hole 32. For the same axial flow passage d2, the oil outlet hole 32 and the fixing hole 31 in communication with the axial flow passage d2 are independent of each other.

[0084] Figure 8 In one embodiment, as shown in FIG. 1, at least one of the two rotor end plates 3 includes a plurality of oil outlet holes 32, each of which is in communication with an axial flow passage d2 and is configured to guide the cooling oil in the axial flow passage d2 to be sprayed out of the axial end of the rotor 10. Each of the fixing holes 31 is also in communication with an axial flow passage d2. In one embodiment, one of the oil outlet holes 32 and one of the fixing holes 31 are in communication with the same axial flow passage d2, and each of the fixing holes 31 avoids the oil outlet hole 32. For the same axial flow passage d2, the oil outlet hole 32 and the fixing hole 31 in communication with the axial flow passage d2 are independent of each other.

[0085] In one embodiment, the oil outlet hole 32 and the fixing hole 31 in communication with the same axial flow passage d2 are arranged in the radial direction of the rotor.

[0086] In one embodiment, the oil outlet hole 32 and the fixing hole 31 in communication with the same axial flow passage d2 are arranged in the circumferential direction of the rotor.

[0087] In one embodiment, as shown in FIG. 1, at least one of the two rotor end plates 3 includes a plurality of oil outlet holes 32, each of which is in communication with an axial flow passage d2 and is configured to guide the cooling oil in the axial flow passage d2 to be sprayed out of the axial end of the rotor 10. Each of the fixing holes 31 is also in communication with an axial flow passage d2. In one embodiment, one of the oil outlet holes 32 and one of the fixing holes 31 are in communication with the same axial flow passage d2, and each of the fixing holes 31 avoids the oil outlet hole 32. For the same axial flow passage d2, the oil outlet hole 32 and the fixing hole 31 in communication with the axial flow passage d2 are independent of each other. Figure 8 In one embodiment, as shown in FIG. 1, at least one of the two rotor end plates 3 includes a plurality of oil outlet holes 32, each of which is in communication with an axial flow passage d2 and is configured to guide the cooling oil in the axial flow passage d2 to be sprayed out of the axial end of the rotor 10. Each of the fixing holes 31 is also in communication with an axial flow passage d2. In one embodiment, one of the oil outlet holes 32 and one of the fixing holes 31 are in communication with the same axial flow passage d2, and each of the fixing holes 31 avoids the oil outlet hole 32. For the same axial flow passage d2, the oil outlet hole 32 and the fixing hole 31 in communication with the axial flow passage d2 are independent of each other.

[0088] Figure 8 ​​As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10.

[0089] As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10. Figure 8 As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10.

[0090] Figure 9 As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10.

[0091] As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10.

[0092] As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10.

[0093] As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10.

[0094] Figure 10a As shown, one oil outlet hole 32 and one fixing hole 31 are communicated with the same axial flow passage d2, and the part of the connecting piece 6 exposed to the rotor end plate 3 passes through the fixing hole 31 and is fixed by the locking piece 7, and the part of the connecting piece 6 exposed to the rotor end plate 3 and the locking piece 7 do not block the oil outlet hole 32, so as not to hinder the oil injection of the rotor 10. Figure 10b ​Figure 1 is an exploded view of a rotor 10. In one embodiment, the rotor 10 includes a rotor shaft 1, a plurality of rotor cores 2, and two rotor end plates 3. At least one of the rotor end plates 3 includes a plurality of oil outlet holes 32, each of which communicates with two axial end faces of the rotor end plate 3 and with an internal oil cooling circuit of the rotor 10, and each of which is configured to receive cooling oil inside the rotor 10 and to spray the cooling oil out of a side of the rotor end plate 3 facing away from the plurality of rotor cores 2.

[0095] In one embodiment, the rotor shaft 1 includes an oil inlet channel d1 configured to supply oil to the rotor 10. The rotor shaft 1 sequentially passes through one of the rotor end plates 3, the plurality of rotor cores 2, and the other of the rotor end plates 3 along an axial direction of the rotor. The plurality of rotor cores 2 and the two rotor end plates 3 can be fixed to the rotor shaft 1 by means of a key groove fit. One end of the rotor shaft 1 is a power output end S configured to be drivingly connected to a speed reducer.

[0096] In one embodiment, the rotor 10 further includes a rotor sleeve 8 wrapped around an outer circumferential surface of the plurality of rotor cores 2 along a circumferential direction of the rotor, as shown in Figure 10a and Figure 10b In one embodiment, the rotor 10 further includes a rotor sleeve 8 wrapped around an outer circumferential surface of the plurality of rotor cores 2 along a circumferential direction of the rotor, as shown in

[0097] In one embodiment, the rotor 10 includes two fixing members 4, one of which is arranged on a side of one of the rotor end plates 3 facing away from the plurality of rotor cores 2 along an axial direction of the rotor, and the other of which is arranged on a side of the other of the rotor end plates 3 facing away from the plurality of rotor cores 2 along the axial direction of the rotor, as shown in Figure 10a and Figure 10b In one embodiment, the rotor 10 includes two fixing members 4, one of which is arranged on a side of one of the rotor end plates 3 facing away from the plurality of rotor cores 2 along an axial direction of the rotor, and the other of which is arranged on a side of the other of the rotor end plates 3 facing away from the plurality of rotor cores 2 along the axial direction of the rotor, as shown in

[0098] In one embodiment, one of the fixing members 4 is an annular shoulder 4b of the rotor shaft 1, and the annular segment shoulder 4a protrudes outward from an outer circumferential surface of the rotor shaft 1 along a radial direction of the motor, as shown in Figure 10b In one embodiment, one of the fixing members 4 is an annular shoulder 4b of the rotor shaft 1, and the annular segment shoulder 4a protrudes outward from an outer circumferential surface of the rotor shaft 1 along a radial direction of the motor, as shown in

[0099] Figure 10b ​As shown, the other fixing member 4 is a ring-shaped structure 4a which is fixed to the rotor shaft 1 by friction.

[0100] In one embodiment, as shown in Figure 10b The rotor 10 further comprises a plurality of magnetic steels 5, and each rotor core 2 is embedded with a plurality of magnetic steels 5. The magnetic steels 5 can form a magnetic field of the rotor 10, which is used to couple with the magnetic field of the stator 20 to drive the rotor 10 to rotate around the axis. The rotor sleeve 8, the two rotor end plates 3 and the plurality of connecting members 6 can cooperate to prevent the plurality of rotor cores 2 from loosening and the magnetic steels 5 from being thrown out when the rotor 10 rotates.

[0101] Figure 11 For a part of the structure of the rotor 10, in one embodiment, the connecting member 6 is fixed to the rotor end plate 3 by the oil outlet hole 32. In one embodiment, one end of the connecting member 6 passes through an oil outlet hole 32 to expose the side of the rotor end plate 3 away from the plurality of rotor cores 2, and the part of the connecting member 6 exposed to the rotor end plate 3 covers the surface of the rotor end plate 3 away from the plurality of rotor cores 2. The connecting structure of the connecting member 6 and the rotor end plate 3 is similar to the connecting mode shown in 7a, and a part of the oil outlet hole 32 corresponds to the fixing hole 31 through which the connecting member 6 passes through the rotor end plate 3. In this embodiment, the oil outlet hole 32 of the rotor 10 is multiplexed as the fixing hole 31 through which the connecting member 6 passes. The oil outlet hole 32 has the functions of fixing the connecting member 6 and oiling, which can simplify the structure and process difficulty of the rotor 10. It is not necessary to open the fixing hole 31 for the connecting member 6 to pass through on the rotor end plate 3, which reduces the problem of excessive stress on the rotor end plate 3 caused by multiple opening grooves, and is beneficial to improve the structural stability of the rotor 10.

[0102] In one embodiment, please continue to refer to Figure 11 As shown, the oil outlet hole 32 needs to consider the functions of limiting the connecting member 6 and oiling, the cross-sectional area of the oil outlet hole 32 is greater than the cross-sectional area of the part of the connecting member 6 located in the oil outlet hole 32, the part of the connecting member 6 exposed to the rotor end plate 3 covers a part of the oil outlet hole 32, and the space of the oil outlet hole 32 not covered by the part of the connecting member 6 exposed to the rotor end plate 3 is used for oiling.

[0103] In one embodiment, as shown in Figure 12a The oil outlet hole 32 comprises a first hole section 321 and a second hole section 322 which are connected and communicated, and the first hole section 321 and the second hole section 322 are arranged and communicated along a first direction, which is the circumferential direction of the rotor or the radial direction of the rotor. Figure 12a In one embodiment, as shown in

[0104] Figure 12b The structure of one oil outlet hole 32 in Figure 12a is shown. As shown in Figure 12bAs shown, the oil outlet hole 32 is multiplexed as a fixing hole 31 for the connection piece 6 to pass through. A first hole section 321 is used to accommodate the connection piece 6, and the connection piece 6 extends out of the rotor end plate 3 through the first hole section 321. A second hole section 322 is used for the cooling oil to spray out. With reference to the structure of the rotor 10, one axial flow channel d2 needs to be connected to both the first hole section 321 and the second hole section 322. In some embodiments, along the first direction, the length H of the oil outlet hole 32 is greater than the length of the axial flow channel d2.

[0105] Please continue to refer to Figure 12b As shown, in one embodiment, the inner wall of the oil outlet hole 32 further comprises two protrusions T opposite along a second direction. The second direction is perpendicular to the first direction. In one embodiment, the first direction is the radial direction of the rotor, and the second direction is the circumferential direction of the rotor. Along the first direction, the two protrusions T are arranged between the first hole section 321 and the second hole section 322. Along the second direction, the spacing h1 of the two protrusions T is less than or equal to the inner wall spacing h2 of the first hole section 321.

[0106] In one embodiment, the inner wall spacing h2 of the first hole section 321 along the second direction is variable, and the spacing of the two protrusions T is less than or equal to the minimum of the inner wall spacing h2 of the first hole section 321 along the second direction.

[0107] In one embodiment, the hole wall shape of the first hole section 321 is adapted to the shape of the connection piece 6, and along the second direction, the spacing h1 of the two protrusions T is less than the outer diameter size of the connection piece 6 accommodated in the first hole section 321. The connection piece 6 is accommodated in the first hole section 321, and the two protrusions T can limit the connection piece 6 along the first direction, preventing the connection piece 6 from coming out of the first hole section 321 into the second hole section 322 along the first direction.

[0108] In one embodiment, the two protrusions T included in the oil outlet hole 32 are arc-shaped protrusions, so that the transition of the first hole section 321 and the second hole section 322 is smoother.

[0109] In one embodiment, the hole walls of the first hole section 321 and the second hole section 322 of the oil outlet hole 32 are both circular arcs, and the structural strength of the oil outlet hole 32 is higher.

[0110] In one embodiment, the first hole section 321 and the second hole section 322 of the oil outlet hole 32 are the same shape, the shape of the oil outlet hole 32 is symmetrical about the two protrusions T, and the structural strength of the oil outlet hole 32 is higher.

[0111] Please continue to refer to Figure 11 and Figure 12a and Figure 12bThe connector 6 passes through the first hole segment 321 and can be radially limited by the first hole segment 321. In one embodiment, the distance between the first hole segment 321 and the axis of the rotor 10 is less than or equal to the distance between the second hole segment 322 and the axis of the rotor 10. The connector 6 is as close as possible to the axis of the rotor 10, so that the axial flow channel d2 reserves more space on the side of the connector 6 away from the axis of the rotor 10 for the coolant to flow through.

[0112] Figure 13 A partial structural diagram of one of the rotor end plates 3 of the rotor 10 is shown. In one embodiment, the aforementioned connector 6 is connected and fixed to the rotor end plate 3 via the oil outlet 32. Specifically, one end of the connector 6 passes through an oil outlet 32 ​​and protrudes from the side of the rotor end plate 3 opposite to the plurality of rotor cores 2, and the portion of the connector 6 protruding from the rotor end plate 3 is connected to the locking member 7. The connection structure between the connector 6 and the rotor end plate 3 is similar to the connection method shown in 7b, and a portion of the oil outlet 32 ​​serves as a fixing hole 31 for the connector 6 to pass through the rotor end plate 3. In this embodiment, the oil outlet 32 ​​of the rotor 10 is reused as a fixing hole 31 for the connector 6 to pass through.

[0113] In one embodiment, please continue to refer to Figure 13 As shown, the oil outlet 32 ​​needs to take into account both the function of limiting the connecting piece 6 and the function of oil outlet. The cross-sectional area of ​​the oil outlet 32 ​​is larger than the cross-sectional area of ​​the part of the connecting piece 6 located inside the oil outlet 32. The part of the connecting piece 6 exposed on the rotor end plate 3 is connected to the locking piece 7. The space of the oil outlet 32 ​​not covered by the locking piece 7 is used for oil outlet.

[0114] In one implementation, such as Figure 14a As shown, the oil outlet 32 ​​includes a first hole segment 321, a second hole segment 322, and a third hole segment 323 that are connected. The second hole segment 322 and the third hole segment 323 are arranged on both sides of the first hole segment 321 along a first direction. The first hole segment 321 is connected to the second hole segment 322 and the third hole segment 323 respectively. The first direction is the circumferential direction of the rotor or the radial direction of the rotor. Figure 14a In one embodiment shown, the first direction is the circumferential direction of the rotor.

[0115] Figure 14b It shows Figure 14a The structure of an oil outlet 32. For example... Figure 14b As shown, the oil outlet 32 ​​is reused as a fixing hole 31 for the connector 6 to pass through. The first hole section 321 is used to accommodate the fixing member 4, which extends beyond the rotor end plate 3 through the first hole section 321 for connecting the locking member 7. The second hole section 322 and the third hole section 323 are used for cooling oil ejection. Referring to the structure of the rotor 10, an axial flow channel d2 needs to be connected to both the first hole section 321 and the second hole section 322 simultaneously. In some embodiments, along the first direction, the length H of the oil outlet 32 ​​is greater than the length of the axial flow channel d2.

[0116] Please continue to refer to Figure 14b As shown in FIG. 1, in an embodiment, the inner wall of the oil outlet hole 32 further comprises two groups of protrusions T, each group of protrusions T comprising two protrusions T opposite in a second direction. The second direction is perpendicular to the first direction. In an embodiment, the first direction is the circumferential direction of the rotor, and the second direction is the radial direction of the rotor. In the first direction, two protrusions T are arranged between the first hole section 321 and the second hole section 322, and the other two protrusions T are arranged between the first short hole section 321 and the third hole section 323. In the second direction, the distance h1 between the two protrusions T is less than or equal to the inner wall distance h2 of the first hole section 321.

[0117] In an embodiment, the inner wall distance h2 of the first hole section 321 in the second direction is variable, and the distance between the two protrusions T is less than or equal to the minimum of the inner wall distance h2 of the first hole section 321 in the second direction.

[0118] In an embodiment, the shape of the hole wall of the first hole section 321 is matched with the shape of the connecting piece 6, and in the second direction, the distance h1 between the two protrusions T is less than the outer diameter size of the connecting piece 6 accommodated in the first hole section 321. When the connecting piece 6 is accommodated in the first hole section 321, the two protrusions T can limit the connecting piece 6 in the first direction, preventing the connecting piece 6 from escaping from the first hole section 321 into the second hole section 322 or the third hole section 323 in the first direction.

[0119] In an embodiment, the two groups of protrusions T included in the oil outlet hole 32 are both arc-shaped protrusions, so that the transition between the first hole section 321 and the second hole section 322 and the transition between the first hole section 321 and the third hole section 323 are smoother.

[0120] In an embodiment, the hole walls of the first hole section 321, the second hole section 322, and the third hole section 323 of the oil outlet hole 32 are all circular arcs, and the structural strength of the oil outlet hole 32 is better.

[0121] In an embodiment, the second hole section 322 and the third hole section 323 of the oil outlet hole 32 are the same shape, and the second hole section 322 and the third hole section 323 are axially symmetrically distributed about the first hole section 321, which can optimize the oil injection mode and also enhance the structural strength of the oil outlet hole 32.

[0122] Please continue to refer to Figure 13 and Figure 14a and Figure 14b, the first hole section 321 can be radially limited by the first hole section 321. In an embodiment, the distance between the first hole section 321 and the axis of the rotor 10 is less than or equal to the distance between the second hole section 322 and the axis of the rotor 10 and the distance between the third hole section 323 and the axis of the rotor 10, the connecting piece 6 is as close as possible to the side of the axis of the rotor 10, so that the axial flow channel d2 leaves more space for the cooling liquid to flow through on the side away from the axis of the rotor 10.

[0123] In summary, the rotor 10 provided by the embodiment of the present application is axially fixed by one or more connecting pieces 6 to axially fix the plurality of rotor cores 2 and the rotor end plate 3, which can prevent the rotor core 2 from loosening along the axial direction of the rotor and the magnetic steel 5 from falling out, and ensure the structural stability of the rotor 10 when rotating at high speed. Each connecting piece 6 utilizes the oil cooling circuit layout in the rotor 10, which can also improve the oil cooling effect of the rotor 10.

[0124] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An axially fixed rotor, characterized by The rotor comprises a plurality of rotor cores, a rotor end plate, and one or more connecting members; Each of the rotor cores comprises a plurality of cooling holes for flowing cooling oil, each of the cooling holes being communicated with two axial end faces of the plurality of rotor cores, the plurality of rotor cores being arranged in sequence along an axial direction of the rotor, and the plurality of cooling holes of each of the rotor cores being communicated with the plurality of cooling holes of the adjacent rotor cores respectively to form a plurality of axial flow channels; The rotor end plate is arranged on one side of the plurality of rotor cores along the axial direction of the rotor, wherein: Along the axial direction of the rotor, a part of each of the connecting members is embedded in one of the axial flow channels, and one end of each of the connecting members protrudes out of the axial flow channel and is fixed to the rotor end plate.

2. The rotor of claim 1, wherein Each of the connecting members comprises an embedded segment accommodated in one of the axial flow channels; Along the radial direction of the rotor, a radial height of the embedded segment is smaller than a radial height of the axial flow channel, and a distance between the embedded segment and one end of the axial flow channel facing the center of the rotor is smaller than a distance between the embedded segment and the other end of the axial flow channel away from the center of the rotor.

3. The rotor of claim 2, wherein Along the circumferential direction of the rotor, a circumferential width of the embedded segment is smaller than a circumferential width of the axial flow channel.

4. The rotor of claim 1, wherein The rotor end plate comprises one or more fixing holes, each of the fixing holes being communicated with an end face of the rotor end plate facing the rotor core, and one end of each of the connecting members protruding out of the axial flow channel passes through one of the fixing holes to be fixed to the side of the rotor end plate away from the rotor core; Along the radial direction of the rotor, a radial height of each of the fixing holes is smaller than a radial height of each of the axial flow channels.

5. The rotor of claim 4, wherein A distance between each of the fixing holes and an axis of the rotor is greater than or equal to a distance between the axial flow channel and the axis of the rotor, and a distance between each of the fixing holes and an outer circumferential surface of the rotor is greater than a distance between the axial flow channel and the outer circumferential surface of the rotor.

6. The rotor of claim 4 wherein, The part of each of the connecting members protruding out of the rotor end plate covers at least a part of a surface of the rotor end plate away from the plurality of rotor cores.

7. The rotor of claim 4 wherein, The rotor comprises a plurality of locking members, each of the locking members being arranged on the side of the rotor end plate away from the plurality of rotor cores along the axial direction of the rotor and covering a part of the surface of the rotor end plate away from the plurality of rotor cores, and the part of each of the connecting members protruding out of the rotor end plate is connected with one of the locking members.

8. The rotor of claim 1, wherein The rotor end plate comprises a plurality of oil outlet holes, each of the oil outlet holes being communicated with two end faces of the rotor end plate to be communicated with one of the axial flow channels; One end of each of the connecting members protruding out of the axial flow channel passes through one of the oil outlet holes along the axial direction of the rotor to be fixed to the side of the rotor end plate away from the rotor core; and Each of the oil outlet holes comprises a first hole section and a second hole section which are connected in communication along a first direction, the first hole section is configured to accommodate the connecting member, the second hole section and the first hole section are connected in communication along an axial direction of the rotor to one of the axial flow channels, the first direction is a radial direction of the rotor or a circumferential direction of the rotor; In the first direction, a length of the oil outlet hole is greater than a length of the axial flow channel.

9. The rotor of claim 8, wherein A hole wall of the oil outlet hole comprises two protrusions which are opposite along a second direction, the second direction is perpendicular to the first direction; The two protrusions are arranged between the first hole section and the second hole section along the first direction, a spacing between the two protrusions is less than an outer diameter of the connecting member accommodated in the first hole section.

10. The rotor of claim 8, wherein The oil outlet hole further comprises a third hole section which is connected in communication with an end of the first hole section away from the second hole section along the first direction.

11. The rotor of claim 8, wherein In the radial direction of the rotor, a spacing between the first hole section and an axis of the rotor is less than or equal to a spacing between the second hole section and the axis of the rotor.

12. The rotor of claim 4 wherein, An end surface of the one rotor end plate away from the one rotor core comprises a central groove; In the radial direction of the rotor, a portion of each of the connecting members exposed from the one rotor end plate is arranged between an outer diameter of the central groove and a central hole of the one rotor end plate; In the axial direction of the rotor, an axial height of each of the connecting members exposed from the one rotor end plate is less than a groove depth of the central groove.

13. A rotor as claimed in any of claims 1 to 11, characterised in that The rotor comprises another rotor end plate which is arranged on another side of the plurality of rotor cores along the axial direction of the rotor; Each of the connecting members exposed from the axial flow channel towards an opening of the another rotor end plate is fixed to the another rotor end plate.

14. A drive motor characterized by The driving motor comprises a stator and the rotor as claimed in any one of claims 1-13, the stator comprises a central hole, the rotor is assembled in the central hole.

15. A powertrain, characterized by, The power assembly comprises a speed reducer and the driving motor as claimed in claim 14, the driving motor is drivingly connected to the speed reducer.

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