Balance ring, rotor, motor, power assembly and vehicle

Abstract

A balancing ring, a rotor, a motor, a power assembly and a vehicle, the balancing ring comprises a ring body and a plurality of first convex ribs, the plurality of first convex ribs are arranged at intervals along the circumferential direction of the ring body, and an air duct is enclosed between every two adjacent first convex ribs; a second convex rib is arranged in at least one air channel, the second convex rib and the first convex rib extend towards the outer edge of the ring body along the interior of the ring body, and the extension length of the second convex rib is different from that of the first convex rib. According to the technical scheme, the second convex ribs with the extension length different from that of the first convex ribs are arranged in the air channels formed by the first convex ribs, so that airflow disturbances of different scales are formed in the radial direction of the ring body, and the heat dissipation effect of airflow in the air channels on a rotor is improved. Compared with the prior art, under the same heat dissipation effect, the formed air channel needs less air flux, and the height of the first convex rib used for forming the air channel can be set to be shorter, so that the air resistance of the first convex rib to the balance ring is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of balancing devices, and in particular to a balancing ring, a rotor, a motor, a powertrain and a vehicle. Background Art

[0002] As people pay more and more attention to environmental protection and low carbon, the pace of development of new energy vehicles has also accelerated significantly. The integration of automobiles with related technologies in the fields of energy, transportation, information and communication has accelerated, and electrification, networking and intelligence have become the development trend and trend of the automobile industry. New technologies for new energy vehicles have sprung up like mushrooms after a rain, for example: the application number is CN202110228793.2, the invention name is hybrid power system, hybrid vehicle and control method thereof; the application number is CN202110231482.1, the invention name is hybrid power system, hybrid vehicle and control method thereof, vehicle controller; the application number is CN202110251139.3, the invention name is hybrid power system, hybrid vehicle and control method thereof, vehicle controller; the application number is CN202010609385.7, the invention name is vehicle power generation control method, device and vehicle; all describe hybrid technology based on electricity, which has multiple advantages such as fast, economical, quiet, smooth and green. The application number is CN202311373582.3, and the invention name is vehicle control method, medium and vehicle; the application number is CN202311351004.X, and the invention name is vehicle braking method, brake controller, storage medium and vehicle; the application number is CN202311222836.1, and the invention name is parking method, medium and vehicle; the application number is CN202311164098.X, and the invention name is vehicle control system, method and vehicle; the application number is CN202311170393.6, and the invention name is vehicle control system, control method, controller and vehicle; the application number is CN202211678720.4, and the invention name is vehicle power control method, device, medium, vehicle controller and vehicle; the application number is The application number is CN202211469445.5, and the name of the invention is vehicle and its control method, device, medium, and electronic device; the application number is CN202210182808.0, and the name of the invention is tire pressure identification device and vehicle; the application number is CN202110744962.8, and the name of the invention is electric drive assembly, four-wheel drive system and automobile; the application number is CN202110474242.4, and the name of the invention is steering control method, electronic control unit, system and vehicle for vehicle; the application number is CN202110351399.8, and the name of the invention is braking control method, device, medium and electronic device; all describe a power system with four wheel-side motors independently driven as the core, which greatly improves the safety and power of new energy vehicles.

[0003] As an important component of new energy vehicles, the motor's rotor will generate a lot of heat during use. The heat will cause the rotor's magnetic steel to dissipate, thus affecting the normal use of the rotor.

[0004] In order to cool the rotor, related technologies will add blades to the surface of the rotor's balance ring. The blades are used to form an air duct when the rotor rotates, thereby accelerating the air flow rate on the balance ring surface, thereby improving the rotor's heat dissipation capacity. Although this heat dissipation method can improve the rotor's heat dissipation capacity, it will also increase the wind resistance on the rotor surface and reduce the transmission efficiency of the motor. Utility Model Content

[0005] The purpose of the present application is to provide a balancing ring, a rotor, a motor, a powertrain and a vehicle, aiming to solve the problem in the related art that the heat dissipation structure on the balancing ring has a great influence on the transmission efficiency of the motor.

[0006] To achieve the purpose of the present application, in a first aspect, the present application provides a balancing ring, the balancing ring comprising a ring body and a plurality of first convex ribs, the plurality of first convex ribs being arranged at intervals along the circumference of the ring body, and an air duct being formed between each two adjacent first convex ribs;

[0007] At least one air duct is provided with a second rib, and the second rib and the first rib both extend from the inside of the ring body toward the outer edge of the ring body, and the extension length of the second rib is different from the extension length of the first rib.

[0008] In a possible implementation, the extension length of the first convex rib is A, the extension length of the second convex rib is B, and B<A.

[0009] In a possible implementation, an extension length of the first convex rib is A, an extension length of the second convex rib is B, and 1.5≤A / B≤2.

[0010] In a possible implementation, a height of the first convex rib along the axial direction of the ring body is C, a height of the second convex rib along the axial direction of the ring body is D, and D<C.

[0011] In a possible implementation, a height of the first convex rib along the axial direction of the ring body is C, a height of the second convex rib along the axial direction of the ring body is D, and 1.1≤C / D≤2.

[0012] In a possible implementation, the height of the first rib along the axis of the ring body is C, 3mm≤C≤5mm;

[0013] The height of the second rib along the axial direction of the ring body is D, 2mm≤D<3mm.

[0014] In a possible implementation, the distance between the projection center of the first rib along the axial direction of the ring body and the projection center of the ring body along its axial direction is E, the distance between the projection center of the second rib along the axial direction of the ring body and the projection center of the ring body along its axial direction is F, and 0.8≤E / F≤1.2.

[0015] In a second aspect, the present application further provides a rotor, the rotor comprising the balancing ring, the balancing ring comprising a ring body and a plurality of first convex ribs, the plurality of first convex ribs being arranged at intervals along the circumference of the ring body, and an air duct being formed between each two adjacent first convex ribs;

[0016] At least one air duct is provided with a second rib, and the second rib and the first rib both extend from the inside of the ring body toward the outer edge of the ring body, and the extension length of the second rib is different from the extension length of the first rib.

[0017] In a third aspect, the present application further proposes a motor, the motor comprising a rotor, the rotor comprising the balance ring, the balance ring comprising a ring body and a plurality of first convex ribs, the plurality of first convex ribs being arranged at intervals along the circumference of the ring body, and an air duct being formed between each two adjacent first convex ribs;

[0018] At least one air duct is provided with a second rib, and the second rib and the first rib both extend from the inside of the ring body toward the outer edge of the ring body, and the extension length of the second rib is different from the extension length of the first rib.

[0019] In a fourth aspect, the present application further proposes a power assembly, the power assembly comprising a motor, the motor comprising a rotor, the rotor comprising the balance ring, the balance ring comprising a ring body and a plurality of first convex ribs, the plurality of first convex ribs being arranged at intervals along the circumference of the ring body, and an air duct being formed between each two adjacent first convex ribs;

[0020] At least one air duct is provided with a second rib, and the second rib and the first rib both extend from the inside of the ring body toward the outer edge of the ring body, and the extension length of the second rib is different from the extension length of the first rib.

[0021] In a fifth aspect, the present application further proposes a vehicle, the vehicle comprising a powertrain, the powertrain comprising a motor, the motor comprising a rotor, the rotor comprising the balancing ring, the balancing ring comprising a ring body and a plurality of first convex ribs, the plurality of first convex ribs being arranged at intervals along the circumference of the ring body, and an air duct being formed between each two adjacent first convex ribs;

[0022] At least one air duct is provided with a second rib, and the second rib and the first rib both extend from the inside of the ring body toward the outer edge of the ring body, and the extension length of the second rib is different from the extension length of the first rib.

[0023] The technical solution of the present application is to set a second rib with a different extension length from the first rib in the air duct formed by the first rib, so as to form airflow disturbances of different scales in the radial direction of the ring body, thereby enhancing the turbulence and mixing of the radial airflow of the ring body, improving the heat exchange capacity of the airflow with the surface of the ring body when the airflow flows along the radial direction of the ring body, and improving the heat dissipation effect of the airflow in the air duct on the rotor. Compared with directly using blades to dissipate heat from the balance ring, under the same heat dissipation effect, the air duct formed by the present application requires less wind flux, and the height of the first rib used to form the air duct can be set shorter, so as to reduce the wind resistance of the first rib to the balance ring and reduce the influence of the balance ring on the rotation efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of an embodiment of the balance ring provided in the present application;

[0026] Figure 2 The flow diagram of the airflow flowing along the radial direction of the balance ring when the rotor rotates;

[0027] Figure 3 for Figure 1 A front view of

[0028] Figure 4 for Figure 3 A cross-sectional view at HH;

[0029] Figure 5 This is the flow diagram when the airflow flows along the circumference of the balance ring when the rotor rotates.

[0030] Description of reference numerals:

[0031] 10-Balance ring;

[0032] 1-ring body, 2-first convex rib, 3-second convex rib, 4-air duct. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0036] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0037] The present application proposes a vehicle, which may be an electric vehicle, a fuel vehicle, or a hybrid vehicle. In some possible implementations of the present application, the vehicle may be a sedan, an off-road vehicle, a truck, or a forklift, and the present application does not limit this.

[0038] The vehicle includes a body, wheels and a powertrain. The body serves as the supporting skeleton of the vehicle and is used to support and connect the various assembly parts of the vehicle. The wheels are rotatably connected to the body. Two, three or four wheels can be provided, and this application does not limit this. The powertrain is housed in the body and is drivably connected to the wheels. The powertrain is used to drive the wheels to rotate, thereby driving the vehicle to move.

[0039] The powertrain includes a motor and a reducer. The motor is the power source of the powertrain, and the power of the motor can be transmitted to the wheels through the reducer, thereby driving the vehicle forward. The motor can be a synchronous motor, an asynchronous motor, or a stepper motor, and this application does not limit this. The reducer is connected between the motor and the wheel, and the reducer can adjust the torque of the motor acting on the wheel, thereby adjusting the speed of the wheel, and then adjusting the speed of the vehicle.

[0040] The motor includes a housing, a stator and a rotor. The housing is the main structure of the motor and is used to support and connect the various assemblies of the motor. The housing is formed with an installation cavity, and the stator is arranged in the installation cavity. The stator includes a stator core and a winding. The stator core is formed by stacking a plurality of stamped silicon steel sheets. The silicon steel sheets are arranged in an annular shape, and a plurality of grooves are arranged on the inner wall surface of the annular shape. The grooves of each silicon steel sheet are interconnected to form a stator slot, and the winding is passed through the stator slot. The winding is connected to an external power supply, and the winding is used to convert the electrical energy of the external power supply into magnetic energy, thereby driving the rotor to rotate.

[0041] The rotor is arranged in the stator core, and includes a rotating shaft, a magnetic steel and a balance ring. The rotating shaft is rotatably arranged in the installation cavity through the rotor bearing. The magnetic steel is fixed on the surface of the rotating shaft or embedded in the rotating shaft. The magnetic steel is used to generate a first magnetic field. The first magnetic field is used to interact with the second magnetic field generated by the winding when the motor is powered on, thereby driving the rotor to rotate.

[0042] The balance rings are arranged on both sides of the shaft to seal the magnets at both ends of the shaft, thereby providing axial limit for the magnets to prevent the magnets from shaking randomly when the shaft rotates. At the same time, when the shaft rotates, the shaft and the magnets arranged thereon will generate a certain inertial force, which will cause the motor to vibrate and generate noise. The setting of the balance ring can dynamically balance the mass distribution of the rotor, so that the center of gravity of the rotor is on the axis, thereby reducing the unbalanced force of the rotor, reducing the rotor noise, and improving the NVH performance of the motor.

[0043] During the use of the motor, the motor's rotor will generate a lot of heat, which will cause the rotor's magnetic steel to dissipate, thereby affecting the rotor's transmission efficiency. In order to achieve the cooling of the rotor, the relevant technology will install blades on the surface of the rotor's balance ring. The blades are used to form an air duct when the rotor rotates, thereby accelerating the air flow rate on the balance ring surface, thereby improving the rotor's heat dissipation capacity. Although this heat dissipation method can improve the rotor's heat dissipation capacity, it will also increase the wind resistance on the rotor surface and reduce the motor's transmission efficiency.

[0044] Please refer to Figure 1 and Figure 2 To solve the above problems, in the present application, a balancing ring 10 includes a ring body 1 and a plurality of first convex ribs 2, wherein the plurality of first convex ribs 2 are arranged at intervals along the circumference of the ring body 1, and an air duct 4 is formed between each adjacent two first convex ribs 2; at least one air duct 4 is provided with a second convex rib 3, and both the second convex rib 3 and the first convex rib 2 extend along the inside of the ring body 1 toward the outer edge of the ring body 1, and the extension length of the second convex rib 3 is different from the extension length of the first convex rib 2.

[0045] The technical solution of the present application is to set a second rib 3 with a different extension length from the first rib 2 in the air duct 4 formed by the first rib 2, so as to form air flow disturbances of different scales in the radial direction of the ring body 1, thereby enhancing the turbulence and mixing of the radial airflow of the ring body 1, improving the heat exchange capacity of the airflow with the surface of the ring body 1 when the airflow flows radially along the ring body 1, and improving the heat dissipation effect of the airflow in the air duct 4 on the rotor. Compared with directly using blades to dissipate heat from the balance ring 10, under the same heat dissipation effect, the air duct 4 formed by the present application requires less wind flux, and the height of the first rib 2 used to form the air duct 4 can be set shorter, so as to reduce the wind resistance of the first rib 2 to the balance ring 10 and reduce the influence of the balance ring 10 on the rotation efficiency of the motor.

[0046] Hereinafter, the balance ring 10 provided in the present application will be described in detail with reference to the accompanying drawings.

[0047] The balancing ring 10 includes a ring body 1, which serves as the structural main body of the balancing ring 10 and is used to support and connect other parts of the balancing ring 10. The balancing ring 10 is sleeved on both ends of the rotating shaft to dynamically balance the mass distribution of the rotating shaft and improve the NVH performance of the rotor rotation.

[0048] The first convex rib 2 is provided on the ring body 1. The first convex rib 2 can be formed integrally with the ring body 1, or can be separately provided with the ring body 1 and then connected to each other. When the first convex rib 2 is formed integrally with the ring body 1, the first convex rib 2 and the ring body 1 can be integrally formed by casting, or can be integrally formed by machining. When the first convex rib 2 and the ring body 1 are separately provided and then connected to each other, the first convex rib 2 and the ring body 1 can be connected by bonding, or can be integrally formed by welding, and the present application does not impose any restrictions on this. The first convex rib 2 is used to form an air duct 4 on the surface of the ring body 1. The air duct 4 is used to provide guidance for the airflow passing through the surface of the ring body 1 when the rotor rotates, thereby increasing the flow velocity of the airflow on the surface of the ring body 1 and improving the heat dissipation capacity of the surface of the ring body 1.

[0049] The first convex rib 2 is extended along the inside of the ring body 1 toward the outer edge of the ring body 1. The first convex rib 2 can extend along a straight line or an arc. In one embodiment of the present application, the first convex rib 2 extends along an arc, and the projection of the first convex rib 2 along the axis of the ring body 1 is an involute. In this way, the flow of air in the air duct 4 is optimized, the vortex in the air duct 4 is reduced, the energy loss in the air duct 4 is reduced, and the influence of the balance ring 10 on the rotation efficiency of the motor is reduced.

[0050] It should be noted that the involute is the involute in the sense of mathematical geometry, which refers to the motion trajectory of any point on a moving straight line when it rolls purely along the base circle. If the center of the projection of the ring body 1 is regarded as the center of the circle, and a coordinate system is established with the center of the circle, the first rib 2 satisfies the involute equation: x = r*cos(t), y = r*s in(t), where x is the position of the first rib 2 on the horizontal coordinate, y is the position of the first rib 2 on the vertical coordinate, and r is the base circle radius, whose size is related to the size of the ring body 1 and the heat dissipation requirements of the rotor. The larger the base circle radius, the closer the first rib 2 is to a straight line.

[0051] The second convex rib 3 is arranged in the air duct 4, and the second convex rib 3 is connected to the ring body 1. The second convex rib 3 can be formed integrally with the ring body 1, or it can be separately arranged with the ring body 1 and then connected to each other. When the second convex rib 3 is formed integrally with the ring body 1, the second convex rib 3 and the ring body 1 can be integrally formed by casting, or they can be integrally formed by machining. When the second convex rib 3 and the ring body 1 are separately arranged and then connected to each other, the second convex rib 3 and the ring body 1 can be connected by bonding, or they can be integrally formed by welding, and this application does not limit this.

[0052] The second rib 3 is extended along the inside of the ring body 1 toward the outer edge of the ring body 1, and the extension length of the second rib 3 is set to be different from the extension length of the first rib 2, so that airflow disturbances of different scales are formed in the radial direction of the ring body 1, thereby enhancing the turbulence and mixing of the radial airflow of the ring body 1, improving the heat exchange capacity of the airflow with the surface of the ring body 1 when the airflow flows radially along the ring body 1, and improving the heat dissipation effect of the airflow in the air duct 4 on the rotor. At the same time, due to the setting of the second rib 3, the air duct 4 no longer needs a large wind volume to ensure the heat dissipation effect of the air duct 4 on the rotor. Therefore, the length of the first rib 2 can be set shorter, the wind resistance of the first rib 2 to the rotor is smaller, and the motor rotation efficiency is higher.

[0053] The number of the second ribs 3 can be one or more, and the second ribs 3 can be set in one air duct 4 or in multiple air ducts 4, and the present application does not limit this. For example, in one embodiment of the present application, each air duct 4 is provided with a second rib 3, so as to improve the disturbance ability of the second ribs 3 on the radial airflow of the ring body 1, reduce the number of all the first ribs 2, and reduce the influence of the balance ring 10 on the rotation efficiency of the motor.

[0054] The second convex rib 3 can extend along a straight line or along an arc. In one embodiment of the present application, the second convex rib 3 extends along an arc, and the projection of the second convex rib 3 along the axis of the ring body 1 is an involute. In this way, the flow of air in the air duct 4 is optimized, the vortex in the air duct 4 is reduced, the energy loss in the air duct 4 is reduced, and the influence of the balance ring 10 on the rotation efficiency of the motor is reduced.

[0055] Please refer to Figure 3 , the extension length of the second convex rib 3 can be greater than the extension length of the first convex rib 2, or less than the extension length of the first convex rib 2, and this application does not impose any restrictions on this. Considering that if the second convex rib 3 extends out of the air duct 4, it will affect the flow of the air duct 4. In one embodiment of the present application, the extension length of the second convex rib 3 is less than the extension length of the first convex rib 2, and the extension length of the first convex rib 2 is A, and the extension length of the second convex rib 3 is B, B<A, so that the second convex rib 3 can be completely located inside the air duct 4 formed by the first convex rib 2, so as to reduce the influence of the second convex rib 3 on the flow of the air duct 4.

[0056] In one possible implementation manner of the present application, the extension length of the first convex rib 2 is A, the extension length of the second convex rib 3 is B, and the ratio A / B of the extension length of the first convex rib 2 to the extension length of the second convex rib 3 satisfies the relationship: 1.5≤A / B≤2. According to test results, under this size ratio, the second convex rib 3 has a better turbulence effect on the air duct 4 formed by the first convex rib 2, and the heat dissipation effect of the air duct 4 is significantly improved.

[0057] The second convex rib 3 can be arranged in the middle of the air duct 4, or at the edge of the air duct 4 close to the ring body 1, or in the middle of the air duct 4 close to the ring body 1, and the present application does not limit this. In one embodiment of the present application, the distance between the projection center of the first convex rib 2 along the axial direction of the ring body 1 and the projection center of the ring body 1 along its axial direction is E, and the distance between the projection center of the second convex rib 3 along the axial direction of the ring body 1 and the projection center of the ring body 1 along its axial direction is F. The projection center refers to the shape center of the projection of the first convex rib 2 and the second convex rib 3 along the axial direction of the ring body 1, and the symmetry axis of the first convex rib 2 and the second convex rib 3 passes through this center.

[0058] In this embodiment, the ratio E / F of the distance between the projection center of the first rib 2 along the axial direction of the ring body 1 and the projection center of the ring body 1 along its axial direction to the distance between the projection center of the second rib 3 along the axial direction of the ring body 1 and the projection center of the ring body 1 along its axial direction satisfies the relationship: 0.8≤E / F≤1.2, preferably, E / F=1, so that the second rib 3 can be arranged close to the center of the air duct 4, thereby improving the uniformity of the second rib 3 for the turbulence of the air duct 4, and finally improving the uniformity of the heat dissipation of the air duct 4 for the balance ring 10, and improving the heat dissipation effect of the balance ring 10 for the rotor.

[0059] Please refer to Figure 4 and Figure 5In one embodiment of the present application, the extension length of the second convex rib 3 is less than the extension length of the first convex rib 2, and the height of the first convex rib along the axis of the ring body is C, and the height of the second convex rib along the axis of the ring body is D, and D<C. In this way, a height difference can be formed between the first convex rib 2 and the second convex rib 3, so that the airflow can move circumferentially along the ring body 1. The heat dissipation capacity of the airflow for the ring body 1 is improved.

[0060] In order to improve the disturbance capability of the second convex rib 3 on the circumferential airflow of the ring body 1, in one embodiment of the present application, the height of the first convex rib 2 along the axial direction of the ring body 1 is C, the height of the second convex rib 3 along the axial direction of the ring body 1 is D, 1.1≤C / D≤2, further, the height of the first convex rib 2 along the axial direction of the ring body 1 is C, 3mm≤C≤5mm, the height of the second convex rib 3 along the axial direction of the ring body 1 is D, 2mm≤D<3mm. Through experiments, it is found that under the restriction of this ratio and size, the second convex rib 3 has a relatively good disturbance effect on the air duct 4 formed by the first convex rib 2, and the heat dissipation effect of the air duct 4 is significantly improved.

[0061] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0062] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A balancing ring, characterized in that: It comprises a ring body and a plurality of first convex ribs, wherein the plurality of first convex ribs are arranged at intervals along the circumference of the ring body, and an air duct is formed between each adjacent two first convex ribs; At least one air duct is provided with a second rib, and the second rib and the first rib both extend from the inside of the ring body toward the outer edge of the ring body, and the extension length of the second rib is different from the extension length of the first rib.

2. The balancing ring according to claim 1, characterized in that: The extension length of the first convex rib is A, the extension length of the second convex rib is B, and B<A.

3. The balancing ring according to claim 2, characterized in that: The extension length of the first convex rib is A, the extension length of the second convex rib is B, and 1.5≤A / B≤2.

4. The balancing ring according to claim 2, characterized in that: The height of the first convex rib along the axial direction of the ring body is C, and the height of the second convex rib along the axial direction of the ring body is D, where D<C.

5. The balancing ring according to claim 4, characterized in that: The height of the first convex rib along the axial direction of the ring body is C, the height of the second convex rib along the axial direction of the ring body is D, and 1.1≤C / D≤2.

6. The balancing ring according to claim 5, characterized in that: The height of the first rib along the axis of the ring body is C, 3mm≤C≤5mm; The height of the second rib along the axial direction of the ring body is D, 2mm≤D<3mm.

7. The balancing ring according to claim 1, characterized in that: The distance between the projection center of the first rib along the axial direction of the ring body and the projection center of the ring body along its axial direction is E, and the distance between the projection center of the second rib along the axial direction of the ring body and the projection center of the ring body along its axial direction is F, 0.8≤E / F≤1.

2.

8. The balancing ring according to claim 1, characterized in that: The projections of the first convex rib and the second convex rib along the axial direction of the ring body are involute lines.

9. A rotor, characterized in that: Comprising a balancing ring as described in any one of claims 1 to 8.

10. A motor, characterized in that: Comprising a rotor as claimed in claim 9.

11. A powertrain, characterized in that: Comprising the motor as claimed in claim 10.

12. A vehicle, characterized in that: Comprising the powertrain as claimed in claim 11.

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