Rotor assembly, motor, electric assembly and vehicle

Abstract

The invention discloses a rotor assembly, a motor, an electric assembly and a vehicle. The rotor assembly comprises a rotor and two magnetism isolating plates, the rotor comprises an iron core, the iron core is provided with an axial flow channel penetrating in the axial direction of the rotor, and the axial flow channel forms part of a motor cooling oil channel; the two magnetism isolating plates are arranged at the two ends of the rotor respectively, annular flow channels are formed in the faces, adjacent to the rotor, of the magnetism isolating plates, and the two ends of the axial flow channel communicate with the annular flow channels of the magnetism isolating plates respectively. The annular flow channel is arranged on the magnet vane and communicated with the two ends of the axial flow channel of the rotor, so that cooling oil can flow in from the two ends of the axial flow channel, the operation balance of the motor is ensured, the cooling efficiency is improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention generally relates to the technical field of electric machines, and more particularly to a rotor assembly, an electric machine, an electric assembly and a vehicle. Background Art

[0002] As the energy crisis and environmental pollution problems continue to intensify, the development of pure electric vehicles has attracted widespread attention from countries around the world. The powertrain in electric vehicles usually includes: motors, reducers, differentials and other mechanisms. At present, permanent magnet motors are usually used for motors, which have the characteristics of high efficiency, high power density, and high speed. However, the motors also heat up quickly when working, so a more efficient cooling system is urgently needed to take away the heat generated by the motors in time. Otherwise, it is easy to cause the motor temperature to rise too high, reduce the motor performance, and even cause winding burning, magnetic steel demagnetization, bearing damage and other consequences, seriously affecting the service life of the motor.

[0003] Therefore, it is necessary to provide a rotor assembly, a motor, an electric assembly and a vehicle to at least partially solve the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, a first aspect of the present invention provides a rotor assembly, comprising:

[0006] A rotor, the rotor comprising an iron core, the iron core being provided with an axial flow channel penetrating along the axial direction of the rotor, the axial flow channel constituting a partial channel of a motor cooling oil channel;

[0007] Two magnetic isolation plates are respectively arranged at two ends of the rotor, an annular flow channel is arranged on one side of the magnetic isolation plate adjacent to the rotor, and two ends of the axial flow channel are respectively connected to the annular flow channel of one magnetic isolation plate.

[0008] Optionally, the axial flow channel comprises:

[0009] A magnetic steel groove is axially extended through the rotor, and is used to install the magnetic steel. The magnetic steel groove also constitutes a partial channel of the motor cooling oil channel. Both ends of the magnetic steel groove are respectively connected to the annular flow channel of the magnetic isolation plate.

[0010] Optionally, the axial flow channel comprises:

[0011] A weight-reducing groove is axially extended through the rotor, and the weight-reducing groove also constitutes a partial channel of the motor cooling oil channel. Both ends of the weight-reducing groove are respectively connected to the annular flow channel of the magnetic isolation plate.

[0012] Optionally, the rotor assembly further comprises:

[0013] The rotor shaft is arranged in the middle of the rotor, and the rotor shaft is provided with a hollow cavity extending along the axial direction of the rotor shaft, and the hollow cavity constitutes a partial channel of the motor cooling oil channel.

[0014] Optionally, the two magnetic isolation plates include:

[0015] A first magnetic isolation plate, the first magnetic isolation plate is disposed on the rotor shaft and adjacent to the first end of the rotor;

[0016] A second magnetic isolation plate is disposed on the rotor shaft and adjacent to the second end of the rotor.

[0017] Optionally, a first oil-spinning hole and a second oil-spinning hole are provided on the shaft wall of the rotor shaft, and the first oil-spinning hole and the second oil-spinning hole penetrate through the shaft wall of the rotor shaft;

[0018] The first magnetic isolation plate is provided with:

[0019] A first oil passage is provided on a side of the first magnetic isolation plate adjacent to the rotor, and the first oil passage extends in a radial direction of the first magnetic isolation plate;

[0020] a second oil passage, arranged on a side of the first magnetic isolation plate adjacent to the rotor, the second oil passage being constructed as an annular flow passage of the first magnetic isolation plate; a first end of the first oil passage being communicated with the first oil-slinging hole, and a second end of the first oil passage being communicated with the second oil passage;

[0021] The second magnetic isolation plate is provided with:

[0022] a third oil passage, arranged on a side of the second magnetic isolation plate adjacent to the rotor, the third oil passage extending in a radial direction of the second magnetic isolation plate;

[0023] The fourth oil channel is arranged on a side of the second magnetic isolation plate adjacent to the rotor, and the fourth oil channel is constructed as an annular flow channel of the second magnetic isolation plate; the first end of the third oil channel is connected to the second oil-flinging hole, and the second end of the third oil channel is connected to the fourth oil channel.

[0024] Optionally, the first magnetic isolation plate is further provided with:

[0025] The third oil-swinging hole penetrates the first magnetic isolation plate along the axial direction of the first magnetic isolation plate and is suitable for throwing oil toward the winding of the stator; the third oil-swinging hole is connected to the second oil channel.

[0026] Optionally, the second magnetic isolation plate is further provided with:

[0027] The fourth oil-swinging hole penetrates the second magnetic isolation plate along the axial direction of the second magnetic isolation plate and is suitable for throwing oil toward the winding of the stator; the fourth oil-swinging hole is connected to the fourth oil channel.

[0028] Optionally, the first end of the first oil channel is in the shape of a cone that tapers radially outward from the first magnetic isolation plate, and / or the first end of the third oil channel is in the shape of a cone that tapers radially outward from the second magnetic isolation plate.

[0029] A second aspect of the present invention provides an electric motor, comprising a rotor assembly according to any one of the above technical solutions.

[0030] A third aspect of the present invention provides an electric assembly, comprising a motor according to any one of the above technical solutions.

[0031] A fourth aspect of the present invention provides a vehicle, comprising the motor described in any one of the above technical solutions or the electric assembly described in any one of the above technical solutions.

[0032] According to a rotor assembly, motor, electric assembly and vehicle of the present invention, an annular flow channel is arranged on the magnetic isolation plate to communicate with both ends of the axial flow channel of the rotor, so that cooling oil can flow in from both ends of the axial flow channel, thereby avoiding the imbalance of the center of gravity of the rotor caused by uneven amount of cooling oil flowing into the axial flow channel from one side, ensuring the balanced operation of the motor, improving the cooling efficiency and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The embodiments of the present invention and their description are shown in the drawings to explain the principles of the present invention. In the drawings,

[0034] Figure 1 A cooling path flow chart of a rotor assembly according to a preferred embodiment of the present invention;

[0035] Figure 2 A cross-sectional view of a motor according to a preferred embodiment of the present invention;

[0036] Figure 3 A three-dimensional diagram of a rotor core according to a preferred embodiment of the present invention;

[0037] Figure 4 for Figure 2 A magnified view of section A;

[0038] Figure 5 It is a three-dimensional diagram of the combined state of the rotor shaft and the second magnetic isolation plate according to a preferred embodiment of the present invention;

[0039] Figure 6 A perspective view of a rotor shaft according to a preferred embodiment of the present invention;

[0040] Figure 7 A front view of a second magnetic isolation plate according to a preferred embodiment of the present invention;

[0041] Figure 8 A cross-sectional view of a combined state of a rotor and a second magnetic isolation plate according to a preferred embodiment of the present invention;

[0042] Fig. 9 A cross-sectional view of a combined state of a rotor and a second magnetic isolation plate according to a preferred embodiment of the present invention;

[0043] Fig.10 FIG. 4 is a cross-sectional view of a motor according to a preferred embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 1: Electronic oil pump 2: Solenoid valve

[0046] 3: Casing oil passage 4: End cover oil passage

[0047] 41: Joint 5: Shaft end seal seat

[0048] 6: Rotor shaft 601: First oil-slinging hole

[0049] 602: Second oil-slinging hole 603: Hollow cavity

[0050] 7: First magnetic isolation plate 701: First oil channel

[0051] 702: Second oil passage 703: Third oil-slinging hole

[0052] 704: Plate body 8: Second magnetic isolation plate

[0053] 801: Third oil passage 802: Fourth oil passage

[0054] 803: Fourth oil-spinning hole 804: Plate body

[0055] 9: Rotor 901: Weight reduction groove

[0056] 902: Magnetic steel slot 903: Magnetic steel

[0057] 904: Iron core 10: Stator

[0058] 101: Winding 11: Housing

[0059] 12: End cap DETAILED DESCRIPTION

[0060] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0061] In order to fully understand the present invention, a detailed description will be provided in the following description. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0062] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0063] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

[0064] The invention discloses a rotor assembly, a motor, an electric assembly and a vehicle.

[0065] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

[0066] like Figure 1 , Figure 2 , Figure 3 As shown, in a preferred embodiment, a rotor assembly comprises: a rotor 9 and two magnetic isolation plates;

[0067] The rotor 9 includes an iron core 904, and the iron core 904 is provided with an axial flow channel penetrating along the axial direction of the rotor 9, and the axial flow channel constitutes a part of the motor cooling oil channel; the axial flow channel may include a magnetic steel groove and may also include a weight reduction groove;

[0068] Two magnetic isolation plates are respectively arranged at two ends of the rotor 9. An annular flow channel is arranged on one side of the magnetic isolation plate adjacent to the rotor 9. Both ends of the axial flow channel are respectively connected to an annular flow channel of a magnetic isolation plate.

[0069] The annular flow channel is conveniently connected to the axial flow channel, which can reduce the requirements for motor assembly accuracy and allow the cooling oil to flow smoothly into the axial flow channel.

[0070] The rotor assembly in this embodiment connects the two ends of the axial flow channel of the rotor by arranging an annular flow channel on the magnetic isolation plate, so that the cooling oil can flow in from both ends of the axial flow channel, thereby avoiding the imbalance of the center of gravity of the rotor caused by uneven amount of cooling oil flowing into the axial flow channel from one side, thereby ensuring the balanced operation of the motor, improving the cooling efficiency and extending the service life of the motor.

[0071] In one embodiment, if Figure 2 , Figure 3 As shown, the iron core 904 is provided with a magnetic steel slot 902 that penetrates the rotor 9 in the axial direction, and the axial flow channel may include the magnetic steel slot 902, the magnetic steel slot 902 is used to install the magnetic steel 903, and the magnetic steel slot 902 also constitutes a part of the motor cooling oil channel;

[0072] The magnetic isolation plate is arranged at the end of the rotor 9, and an annular flow channel is arranged on the side of the magnetic isolation plate adjacent to the rotor 9, and the annular flow channel is connected to the magnetic steel groove 902. A magnetic isolation plate is arranged at each end of the rotor 9, and cooling oil can circulate in the annular flow channel, and cooling oil can flow into the annular flow channel from both ends of the magnetic steel groove 902.

[0073] The iron core 904 can be made of laminated silicon steel sheets, and the magnetic steel 903 is a permanent magnet. The magnetic steel slot 902 is set in a V shape or other shapes in the iron core 904, and the cross-sectional area of ​​the magnetic steel slot 902 is larger than the cross-sectional area of ​​the magnetic steel 903, so after the magnetic steel 903 is installed in the magnetic steel slot 902, there is still remaining space, so that cooling oil can flow, so that the magnetic steel slot 902 constitutes a partial channel of the motor cooling oil channel. After the cooling oil enters the magnetic steel slot 902, the cooling oil directly contacts the magnetic steel 903, which can efficiently take away the heat of the magnetic steel, so that the magnetic steel 903 is quickly cooled without high temperature.

[0074] By arranging an annular flow channel on the magnetic isolation plate and making the magnetic steel groove of the rotor a part of the motor cooling oil channel, the annular flow channel is conveniently connected to the magnetic steel groove, which can reduce the requirements for the motor assembly accuracy, so that the cooling oil can flow smoothly into the magnetic steel groove, expand the area of ​​the cooling channel, improve the cooling efficiency, and take into account the cooling of the two heat-generating components of the motor, the rotor core and the magnetic steel, directly cool the core and the magnetic steel, effectively take away the heat of the magnetic steel, and the risk of permanent demagnetization of the magnetic steel at high temperature is low, thereby extending the service life of the motor.

[0075] In one embodiment, if Figure 2 , Figure 5 As shown, the rotor assembly also includes:

[0076] The rotor shaft 6 is arranged in the middle of the rotor 9 . The rotor shaft 6 is provided with a hollow cavity 603 extending along the axial direction of the rotor shaft 6 . The hollow cavity 603 constitutes a partial channel of the motor cooling oil channel.

[0077] One end of the hollow cavity 603 is provided with a spline, through which the rotor shaft 6 can be connected to the shaft of the reducer for outputting power to the outside without affecting the transmission between the rotor shaft 6 and the reducer.

[0078] The cooling oil in this embodiment may be lubricating oil, which plays a role of lubrication and cooling in the reducer and mainly plays a cooling role in the motor.

[0079] By making the rotor shaft constitute part of the motor cooling oil channel, it is more convenient to transport cooling oil to the motor, and the pipeline laying structure of the cooling oil circuit is simplified, thereby improving the integration of the powertrain and reducing the weight of the powertrain.

[0080] In one embodiment, if Figure 2 , Figure 4 As shown, the two magnetic isolation plates include:

[0081] A first magnetic isolation plate 7, which is disposed on the rotor shaft 6 and is adjacent to a first end of the rotor 9;

[0082] The second magnetic shielding plate 8 is arranged on the rotor shaft 6 and is adjacent to the second end of the rotor 9. Because the rotor 9 is provided with a permanent magnet, the first magnetic shielding plate 7 and the second magnetic shielding plate 8 can block the influence of the magnetic field of the permanent magnet along the axial direction of the rotor 9 to the outside, prevent magnetic leakage, optimize the magnetic field layout of the rotor 9, and improve the motor performance. The first magnetic shielding plate 7 and the second magnetic shielding plate 8 clamp the iron core 904 from both ends, and can also strengthen the structural strength of the rotor 9. The material of the first magnetic shielding plate 7 and the second magnetic shielding plate 8 can be selected from non-magnetic conductive materials.

[0083] In one embodiment, if Figure 2 , Figure 4 , Figure 5 As shown, the first magnetic isolation plate 7 and the second magnetic isolation plate 8 have the same structure and are symmetrically arranged on the rotor shaft 6 with the radial center line of the rotor 9 as a reference.

[0084] In one embodiment, if Figure 4 , Figure 5 , Figure 6 As shown, a first oil-spinning hole 601 and a second oil-spinning hole 602 are provided on the shaft wall of the rotor shaft 6, and the first oil-spinning hole 601 and the second oil-spinning hole 602 penetrate the shaft wall of the rotor shaft 6;

[0085] The first magnetic isolation plate 7 is provided with:

[0086] The first oil passage 701 is provided on a side of the first magnetic isolation plate 7 adjacent to the rotor 9, and the first oil passage 701 extends along the radial direction of the first magnetic isolation plate 7;

[0087] The second oil passage 702 is arranged on a side of the first magnetic isolation plate 7 adjacent to the rotor 9. The second oil passage 702 is annular, and the cooling oil can circulate in the second oil passage 702. The second oil passage 702 is constructed as an annular flow passage of the first magnetic isolation plate 7;

[0088] The first end of the first oil passage 701 is communicated with the first oil-slinging hole 601 , and the second end of the first oil passage 701 is communicated with the second oil passage 702 ;

[0089] The second magnetic isolation plate 8 is provided with:

[0090] The third oil passage 801 is provided on a side of the second magnetic isolation plate 8 adjacent to the rotor 9, and the third oil passage 801 extends along the radial direction of the second magnetic isolation plate 8;

[0091] The fourth oil passage 802 is arranged on a side of the second magnetic isolation plate 8 adjacent to the rotor 9. The fourth oil passage 802 is annular. The cooling oil can circulate in the fourth oil passage 802. The fourth oil passage 802 is constructed as an annular flow passage of the second magnetic isolation plate 8.

[0092] A first end of the third oil passage 801 is communicated with the second oil-slinging hole 602 , and a second end of the third oil passage 801 is communicated with the fourth oil passage 802 .

[0093] The first oil-slinging hole 601 and the second oil-slinging hole 602 can be provided with multiple, for example, four, six, etc., uniformly distributed around the side wall of the rotor shaft 6 to improve the delivery efficiency of the cooling oil. The first oil-slinging hole 601 and the second oil-slinging hole 602 are connected to the hollow cavity 603. During the rotation of the rotor shaft 6, the cooling oil is subjected to the centrifugal force and is outputted outward from the hollow cavity 603 through the first oil-slinging hole 601 and the second oil-slinging hole 602 (in the form of being slinged out). The oil slinging out through the first oil-slinging hole 601 passes through the first oil passage 701 of the first magnetic isolation plate 7 and enters the second oil passage 702. The oil slinging out through the second oil-slinging hole 602 passes through the third oil passage 801 of the second magnetic isolation plate 8 and enters the fourth oil passage 802, so that the lubricating oil enters the axial flow passage of the rotor 9 to cool the rotor 9. The number of the first oil-slinging hole 601 and the second oil-slinging hole 602 is equal, so that the amount of oil slinging on both sides is equal.

[0094] The first oil passage 701 may be provided in plurality, corresponding to the number of the first oil-slinging holes 601. The third oil-slinging holes 703 may be provided in plurality, such as four, six, etc., evenly distributed around the outer edge of the second oil passage 702, or evenly distributed in the second oil passage 702, to improve the delivery efficiency of the cooling oil. The third oil passage 801 may be provided in plurality, corresponding to the number of the second oil-slinging holes 602. The fourth oil-slinging holes 803 may be provided in plurality, such as four, six, etc., evenly distributed around the outer edge of the fourth oil passage 802, or evenly distributed in the fourth oil passage 802, to improve the delivery efficiency of the cooling oil.

[0095] In one embodiment, if Figure 5 , Figure 7 As shown, the first magnetic isolation plate 7 is also provided with:

[0096] The third oil-slinging hole 703 penetrates the first magnetic isolation plate 7 along the axial direction of the first magnetic isolation plate 7 and is suitable for throwing oil toward the winding 101 of the stator 10; the third oil-slinging hole 703 is connected with the second oil passage 702. In this embodiment, the cooling oil that enters the second oil passage 702 through the first oil-slinging hole 601 and the internal axial flow passage of the rotor 9 can be thrown out through the third oil-slinging hole 703, thereby ensuring the fluidity of the cooling oil, and at the same time, the winding 101 of the stator 10 can be cooled by oil-slinging.

[0097] In one embodiment, if Figure 8 , Fig. 9 As shown, the second magnetic isolation plate 8 is also provided with:

[0098] The fourth oil-slinging hole 803 penetrates the second magnetic isolation plate 8 along the axial direction of the second magnetic isolation plate 8 and is suitable for throwing oil toward the winding 101 of the stator 10; the fourth oil-slinging hole 803 is connected with the fourth oil passage 802. In this embodiment, the cooling oil that enters the fourth oil passage 802 through the second oil-slinging hole 602 and the internal axial flow passage of the rotor 9 can be thrown out through the fourth oil-slinging hole 803, thereby ensuring the fluidity of the cooling oil, and at the same time, the winding 101 of the stator 10 can be cooled by oil-slinging.

[0099] In one embodiment, if Figure 1 , Figure 2 , Figure 3 As shown, the iron core 904 is also provided with a weight-reducing groove 901 penetrating along the axial direction of the rotor 9, and the axial flow channel may include the weight-reducing groove 901, and the weight-reducing groove 901 is used to reduce the weight of the iron core 904, and the weight-reducing groove 901 also constitutes a part of the motor cooling oil channel;

[0100] The second oil passage 702 is in communication with a first end of the lightening groove 901 , and the fourth oil passage 802 is in communication with a second end of the lightening groove 901 .

[0101] By making the weight-reducing groove 901 a partial channel of the motor cooling oil channel, the cooling oil enters the weight-reducing groove 901 to directly cool the iron core 904 , which can further improve the cooling efficiency of the rotor 9 .

[0102] In one embodiment, if Figure 5 , Figure 7 As shown, the first end of the first oil channel 701 is tapered in a radially outward direction of the first magnetic isolation plate 7 , and / or the first end of the third oil channel 801 is tapered in a radially outward direction of the second magnetic isolation plate 8 .

[0103] By enlarging the first end of the first oil channel 701, it is convenient to connect with the first oil-flinging hole 601. By enlarging the first end of the third oil channel 801, it is convenient to connect with the second oil-flinging hole 602. The cooling oil path is ensured to be unobstructed. A small deviation between the first oil channel 701 and the first oil-flinging hole 601, and between the third oil channel 801 and the second oil-flinging hole 602 can be allowed, thereby reducing the requirements for the motor assembly accuracy.

[0104] In one embodiment, if Figure 8 , Fig. 9 As shown, the maximum outer diameter of the second oil passage 702 and the fourth oil passage 802 is greater than the minimum outer diameter of the magnetic steel groove 902 on the rotor 9. This arrangement can ensure that the second oil passage 702 and the fourth oil passage 802 are effectively connected to the magnetic steel groove 902, ensuring that the cooling oil passage is unobstructed;

[0105] The minimum inner diameter of the second oil passage 702 and the fourth oil passage 802 is smaller than the maximum outer diameter of the weight reduction groove 901 on the rotor 9. This arrangement ensures that the second oil passage 702 and the fourth oil passage 802 are effectively connected to the weight reduction groove 901, thereby ensuring that the cooling oil path is unobstructed.

[0106] In one embodiment, if Figure 2 As shown, the rotor assembly also includes:

[0107] The shaft end seal seat 5 is arranged at the first end of the rotor shaft 6 and is used to seal the first end of the hollow cavity 603 of the rotor shaft 6. The second end of the hollow cavity 603 is suitable for flowing out cooling oil, and the cooling oil can flow into other devices connected to the rotor shaft 6, such as a reducer. The shaft end seal seat 5 seals the gap between the joint 41 of the end cover oil passage 4 and the inner wall of the hollow cavity 603 to prevent the cooling oil from leaking from the gap, and ensures that the cooling oil can flow from the first end to the second end of the rotor shaft 6 in the hollow cavity 603. The shaft end seal seat 5 allows the joint 41 to rotate relatively.

[0108] like Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of the present invention further provides an electric machine, comprising a rotor assembly according to any one of the above embodiments.

[0109] In one embodiment, if Figure 1 , Figure 2 As shown, the motor also includes:

[0110] The casing oil passage 3 is provided in the casing 11 of the motor, and the first end of the casing oil passage 3 is connected to the electronic oil pump 1. In the cooling oil circulation loop, the electronic oil pump 1 is used to provide conveying power for the cooling oil, and the electronic oil pump 1 drives the cooling oil to flow into the casing oil passage 3.

[0111] In one embodiment, if Figure 1 , Figure 2 As shown, the motor also includes:

[0112] The end cover oil passage 4 is provided on the end cover 12 of the motor, the first end of the end cover oil passage 4 is communicated with the second end of the casing oil passage 3, and the second end of the end cover oil passage 4 is communicated with the first end of the hollow cavity 603 of the rotor shaft 6. The second end of the end cover oil passage 4 is provided with a joint 41 protruding along the axial direction of the motor, and the joint 41 can extend into the hollow cavity 603 to achieve communication with the hollow cavity 603.

[0113] In one embodiment, if Figure 1 , Figure 2 As shown, the motor also includes:

[0114] The stator 10 includes a winding 101 , and the third oil-spinning hole 703 and the fourth oil-spinning hole 803 are both arranged corresponding to the winding 101 . The cooling oil output (by way of spinning) from the third oil-spinning hole 703 and the fourth oil-spinning hole 803 can be thrown onto the winding 101 to cool the stator 10 .

[0115] In one embodiment, the motor further comprises:

[0116] A housing 11, in which the rotor shaft 6, the rotor 9 and the stator 10 are arranged, and the stator 10 is fixedly connected to the housing 11;

[0117] The end cover 12 is disposed at one end of the shell 11 to seal the shell 11 . The end cover 12 is detachably fixedly connected to the shell 11 .

[0118] The end cover 12 is provided with a first bearing corresponding to the first end of the rotor shaft 6 , and the housing 11 is provided with a second bearing corresponding to the second end of the rotor shaft 6 . The first bearing and the second bearing support the rotor shaft 6 to rotate.

[0119] In one embodiment, if Fig.10 As shown, the motor also includes:

[0120] More than two rotors 9 are connected to the same end cover oil passage 4 and casing oil passage 3. By providing more than two rotors 9, different powers can be allocated to different rotors 9 to improve vehicle driving efficiency.

[0121] In one embodiment, if Figure 1 , Figure 2 As shown, the motor also includes:

[0122] The electronic oil pump 1 is arranged in the housing 11 and connected to the first end of the housing oil passage 3. The function of the electronic oil pump 1 is to suck the cooling oil from the oil pool into the motor. In the cooling oil circulation loop, the electronic oil pump 1 provides conveying power for the cooling oil.

[0123] In one embodiment, if Figure 1 , Figure 2 As shown, the motor also includes:

[0124] Solenoid valve 2, solenoid valve 2 is arranged in the casing oil passage 3, and is used to control the flow of cooling oil. According to the operating conditions of the motor, the solenoid valve 2 can adjust the flow of cooling oil delivered to the motor. For example, when the motor is running at high load, the flow of cooling oil delivered to the motor is increased to improve the cooling efficiency. When the motor is running at low load, the flow of cooling oil delivered to the motor is reduced to meet the cooling requirements while reducing the agitation of the cooling oil.

[0125] In one embodiment, if Figure 1 , Figure 2 As shown, the circulation path of the cooling oil is:

[0126] The cooling oil of the rotor cooling mechanism is sucked into the electronic oil pump, and the amount of oil entering the motor is controlled by the solenoid valve and enters from the oil channel of the casing. The cooling oil enters the hollow cavity of the rotor shaft through the oil channel of the end cover. The cooling oil in the hollow cavity of the rotor shaft flows into the corresponding left and right magnetic isolation plate oil channels through the oil-flinging holes on the left and right sides of the rotor shaft respectively, and enters the annular oil channel of the magnetic isolation plate from the left and right magnetic isolation plate oil channels. The annular oil channel is connected to the rotor's iron core weight reduction groove and magnetic steel groove. The cooling oil cools the rotor core and magnetic steel. Finally, the cooling oil is thrown out from the magnetic isolation plate to cool the stator winding.

[0127] The rotor cooling mechanism of this embodiment can take into account the cooling of the three heat-generating components of the motor, namely the rotor core, the magnetic steel and the stator winding, which not only increases the service life of the motor but also reduces the risk of burning of the stator winding.

[0128] An embodiment of the present invention further provides an electric assembly, comprising the motor described in any one of the above embodiments.

[0129] The electric assembly may also include a reducer, a differential, a half shaft, etc. The reducer is connected to the motor drive and is driven by the motor.

[0130] An embodiment of the present invention further provides a vehicle, comprising the motor according to any one of the above embodiments or the electric assembly according to any one of the above embodiments.

[0131] The vehicle can be either a pure electric vehicle or a hybrid vehicle.

[0132] A rotor assembly, a motor, an electric assembly and a vehicle of the present invention have the following characteristics:

[0133] The motor rotor cooling technology in the prior art mainly removes the heat generated by the magnet and the rotor core during the operation of the motor by cooling the rotating shaft, the rotor core and other components indirectly. The heat transfer efficiency is poor, less heat is removed, and the magnet is still at risk of permanent demagnetization at high temperature. In the present invention, the rotor oil circuit directly contacts the magnet, has good heat transfer efficiency, removes more heat from the magnet, and has a low risk of permanent demagnetization at high temperature, thereby extending the service life of the motor.

[0134] The present invention uses fewer parts and realizes comprehensive cooling of the rotor core, magnetic steel and windings, has a simple structure, is easy to install and has low cost.

[0135] The motor rotor oil path flow resistance of the present invention is low, less oil is accumulated in the shaft, and while the motor cooling effect is ensured, the oil in the rotor can be discharged smoothly, reducing the mechanical loss of the motor and having little effect on the motor output power.

[0136] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0137] In understanding the scope of the present invention, the term "comprise" and its derivatives as used herein are intended to be open terms, which specify the existence of recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "include", "have" and their derivatives.

[0138] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.

[0139] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0140] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotor (9), the rotor (9) comprising an iron core (904), the iron core (904) being provided with an axial flow channel penetrating along the axial direction of the rotor (9), the axial flow channel constituting a partial channel of a motor cooling oil channel; Two magnetic isolation plates are respectively arranged at two ends of the rotor (9); an annular flow channel is arranged on one side of the magnetic isolation plate adjacent to the rotor (9); and the two ends of the axial flow channel are respectively connected to the annular flow channel of one of the magnetic isolation plates.

2. The rotor assembly according to claim 1, characterized in that The axial flow channel comprises: A magnetic steel groove (902) is axially extended through the rotor (9), the magnetic steel groove (902) is used to install the magnetic steel (903), the magnetic steel groove (902) also constitutes a partial channel of the motor cooling oil channel, and the two ends of the magnetic steel groove (902) are respectively connected to the annular flow channel of the magnetic isolation plate.

3. The rotor assembly according to claim 1, characterized in that: The axial flow channel comprises: A weight-reducing groove (901) is axially extended through the rotor (9), and the weight-reducing groove (901) also constitutes a partial channel of the motor cooling oil channel. Both ends of the weight-reducing groove (901) are respectively connected to the annular flow channel of the magnetic isolation plate.

4. The rotor assembly according to claim 1, characterized in that: Also includes: A rotor shaft (6), wherein the rotor shaft (6) is arranged in the middle of the rotor (9), and the rotor shaft (6) is provided with a hollow cavity (603) extending along the axial direction of the rotor shaft (6), and the hollow cavity (603) constitutes a partial channel of the motor cooling oil channel.

5. The rotor assembly according to claim 4, characterized in that: The two magnetic isolation plates include: a first magnetic isolation plate (7), the first magnetic isolation plate (7) being arranged on the rotor shaft (6) and adjacent to a first end of the rotor (9); A second magnetic isolation plate (8), wherein the second magnetic isolation plate (8) is arranged on the rotor shaft (6) and is adjacent to the second end of the rotor (9).

6. The rotor assembly according to claim 5, characterized in that A first oil-spinning hole (601) and a second oil-spinning hole (602) are provided on the shaft wall of the rotor shaft (6); the first oil-spinning hole (601) and the second oil-spinning hole (602) pass through the shaft wall of the rotor shaft (6); The first magnetic isolation plate (7) is provided with: A first oil passage (701) is arranged on a side of the first magnetic isolation plate (7) adjacent to the rotor (9), and the first oil passage (701) extends in a radial direction of the first magnetic isolation plate (7); a second oil passage (702) disposed on a side of the first magnetic isolation plate (7) adjacent to the rotor (9), the second oil passage (702) being constructed as an annular flow passage of the first magnetic isolation plate (7); a first end of the first oil passage (701) being in communication with the first oil-slinging hole (601), and a second end of the first oil passage (701) being in communication with the second oil passage (702); The second magnetic isolation plate (8) is provided with: A third oil passage (801) is arranged on a side of the second magnetic isolation plate (8) adjacent to the rotor (9), and the third oil passage (801) extends in the radial direction of the second magnetic isolation plate (8); A fourth oil passage (802) is arranged on a side of the second magnetic isolation plate (8) adjacent to the rotor (9), and the fourth oil passage (802) is constructed as an annular flow passage of the second magnetic isolation plate (8); a first end of the third oil passage (801) is connected to the second oil-swinging hole (602), and a second end of the third oil passage (801) is connected to the fourth oil passage (802).

7. The rotor assembly according to claim 6, characterized in that The first magnetic isolation plate (7) is further provided with: The third oil-swinging hole (703) penetrates the first magnetic isolation plate (7) along the axial direction of the first magnetic isolation plate (7) and is suitable for swinging oil toward the winding of the stator; the third oil-swinging hole (703) is connected to the second oil channel (702).

8. The rotor assembly according to claim 6, characterized in that The second magnetic isolation plate (8) is further provided with: a fourth oil-spinning hole (803), penetrating the second magnetic isolation plate (8) along the axial direction of the second magnetic isolation plate (8) and being suitable for spinning oil toward the winding of the stator; The fourth oil-swinging hole (803) is in communication with the fourth oil passage (802).

9. The rotor assembly according to claim 6, characterized in that: The first end of the first oil channel (701) is in the shape of a cone that tapers radially outward from the first magnetic isolation plate (7), and / or the first end of the third oil channel (801) is in the shape of a cone that tapers radially outward from the second magnetic isolation plate (8).

10. A motor, characterized in that: include: A rotor assembly according to any one of claims 1 to 9.

11. An electric assembly, characterized in that: include: The electric machine according to claim 10.

12. A vehicle, characterized in that: include: The electric machine according to claim 10 or the electric assembly according to claim 11.

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