Electric machine, electric drive assembly and vehicle

Abstract

The application relates to an electric machine, an electric drive assembly and a vehicle. The electric machine comprises a rotating shaft part, a mounting seat and a bearing part. The side of the rotating shaft part is inwardly recessed to form a containing space. The rotating shaft part comprises an opening located at the side and communicating with the containing space. The mounting seat is arranged in the containing space from the opening. The bearing part is arranged in the containing space, and the bearing part is arranged in the gap of the mounting seat and abuts against the inner wall of the rotating shaft part. In summary, on the one hand, the bearing part is arranged in the containing space, so that the external space required by the rotating shaft part is reduced. On the other hand, the bearing part is arranged in the gap of the mounting seat, so that the mounting is facilitated. The bearing part abuts against the inner wall of the rotating shaft part, so that the connection between the bearing part and the rotating shaft part is more stable, and the stability of the electric machine is improved.

Description

Technical Field

[0001] This application relates to the field of electric motors, and more particularly to electric motors, electric drive assemblies, and vehicles. Background Technology

[0002] Electric vehicles typically consist of components such as a battery pack, motor, power electronic controller, on-board charger, and thermal management system, forming a tightly integrated system for operation. The motor is the direct power source of an electric vehicle. It converts the electrical energy provided by the battery pack into mechanical energy, thereby propelling the vehicle forward. Compared to traditional internal combustion engines, electric motors are more efficient, converting energy into kinetic energy more effectively. Their performance directly impacts the overall performance, user experience, and environmental benefits of an electric vehicle.

[0003] The bearing is usually installed at the outer end of the shaft, which requires more space in the shaft to accommodate the bearing. On the other hand, the mounting base also needs to have a more complex structure to support the bearing. Utility Model Content

[0004] The purpose of this application is to provide an electric motor, an electric drive assembly, and a vehicle.

[0005] According to a first aspect of the embodiments of this application, a motor is provided, the motor comprising:

[0006] The rotating shaft portion has its side recessed inward to form a receiving space, and the rotating shaft portion includes an opening located on the side, which is connected to the receiving space.

[0007] Mounting base, wherein the mounting base extends at least partially from the opening into the receiving space;

[0008] The bearing portion is disposed in the receiving space, and the bearing portion is spaced on the mounting base and abuts against the inner wall of the rotating shaft portion.

[0009] In an optional embodiment, the mounting base includes a base body and a sleeve body. The base body includes a protruding area that extends into the receiving space from the opening. The sleeve body is disposed on the protruding area, and the bearing portion is sleeved on the sleeve body.

[0010] In an optional embodiment, the sleeve includes a first sleeve unit and a second sleeve unit connected along the length direction, wherein the first sleeve unit is configured to cooperate with the bearing portion;

[0011] The diameter of the second set of units is larger than that of the first set of units to form a stepped unit, and the seat is at least partially disposed on the stepped unit for fixing the set.

[0012] In an optional embodiment, the motor further includes an elastic element disposed between the second set of units and the bearing portion, and abutting against the second set of units and the bearing portion respectively.

[0013] In an optional embodiment, the distance between the second set of units and the bearing portion is defined as a first distance, which is greater than or equal to 1 mm and less than or equal to 4 mm.

[0014] In an optional embodiment, the sleeve has the same hardness as the bearing portion.

[0015] In an optional embodiment, the pivot portion includes a shoulder unit, and the bearing portion is fitted to the shoulder unit.

[0016] In an optional embodiment, the mounting base includes an oil delivery channel, and the motor includes a rotor oil pipe, which is disposed on the mounting base and connected to the oil delivery channel.

[0017] In an optional embodiment, the rotor oil pipe includes a side nozzle that can communicate with the bearing portion;

[0018] Liquid is fed into the rotor oil pipe through the self-flowing oil channel, and then sprayed onto the bearing section through the side nozzle of the rotor oil pipe.

[0019] According to a second aspect of the embodiments of this application, an electric drive assembly is provided, including a motor as described in any of the above embodiments.

[0020] According to a third aspect of the embodiments of this application, a vehicle is provided, including the electric drive assembly as described in the above embodiments.

[0021] The beneficial technical effects of the technical solutions provided in this application are:

[0022] The motor includes a shaft, a mounting base, and a bearing. The shaft is recessed inward on its side to form a receiving space, and the shaft includes an opening on its side that communicates with the receiving space. The mounting base extends at least partially into the receiving space through the opening. The bearing is disposed in the receiving space, and the bearing is spaced on the mounting base and abuts against the inner wall of the shaft.

[0023] Because the bearing section is housed within a fixed space inside the shaft section, the overall length of the shaft section can be reduced. This design saves space and reduces weight, resulting in a smaller motor that is more suitable for installation in confined spaces. Furthermore, the shorter shaft section facilitates installation and disassembly, simplifying the assembly process and making routine maintenance more convenient. Additionally, the shorter shaft section is more stable, reducing the risk of bending and twisting that can occur with a longer shaft. This helps reduce the overall vibration level of the system, thereby improving operational smoothness and reliability.

[0024] The bearing assembly is positioned to abut against the inner wall of the shaft assembly. This design provides better support for both the bearing and shaft, preventing axial movement and reducing vibration and noise during operation, thus improving equipment efficiency and lifespan. Furthermore, the bearing assembly has a clearance fit with the bushing assembly, facilitating easy installation and removal. Appropriate clearance allows the bearing to slide easily into its intended position without excessive force, reducing the risk of damage. Additionally, during operation, the shaft and bearing assemblies may expand due to friction and heat. A proper clearance fit can compensate for these dimensional changes, preventing jamming or excessive stress concentration caused by overly tight fits.

[0025] In summary, on the one hand, the bearing section is located within the accommodating space, thereby reducing the external space required for the rotating shaft section. On the other hand, the clearance fit between the bearing section and the mounting base facilitates installation, and the abutting arrangement between the bearing section and the inner wall of the rotating shaft section ensures a more stable connection between them, thus improving the stability of the motor. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an electric motor according to an embodiment of this application.

[0028] Figure 2 This is a schematic cross-sectional view of an electric motor according to an embodiment of this application.

[0029] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0030] Figure 4This is a cross-sectional schematic diagram of an electric motor from another angle, according to an embodiment of this application.

[0031] Figure 5 for Figure 4 Enlarged diagram of point B in the middle.

[0032] Explanation of reference numerals in the attached figures

[0033] Motor 10

[0034] Rotating shaft 100

[0035] Capacity 110

[0036] Opening 111

[0037] Vest Unit 120

[0038] Mounting base 200

[0039] Base body 210

[0040] Prominent Area 211

[0041] 220 pieces

[0042] Oil transport channel 230

[0043] Unit 221 (First Set)

[0044] Unit 222 (Second Set)

[0045] Step unit 223

[0046] Bearing section 300

[0047] Elastic element 400

[0048] Rotor oil pipe 500

[0049] Side nozzle 510

[0050] Length direction X Detailed Implementation

[0051] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0052] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0053] Electric vehicles typically consist of components such as a battery pack, a motor 10, a power electronic controller, an on-board charger, and a thermal management system, forming a tightly integrated system for operation. The motor 10 is the direct power source of the electric vehicle. It converts the electrical energy provided by the battery pack into mechanical energy, thereby propelling the vehicle forward. Compared to traditional internal combustion engines, electric motors are more efficient, converting energy into kinetic energy more effectively. Its performance directly impacts the overall performance, user experience, and environmental benefits of the electric vehicle.

[0054] The motor 10 typically includes components such as a shaft 100, a mounting base 200, bearings 300, a stator, a rotor, and a housing. The stator is the stationary part, usually mounted inside the motor 10 housing, and contains coils that generate a magnetic field. The rotor is the rotating part located inside the stator; it generates its own magnetic field through electromagnetic induction or direct current excitation and interacts with the stator's magnetic field to achieve rotational motion. The shaft 100 is connected to the rotor and extends from one end of the motor 10, used to transfer the mechanical energy generated by the rotor to an external load. The shaft 100 is designed to have sufficient strength and rigidity to withstand the forces applied by the load, while minimizing vibration and noise. Bearings 300 are mounted at both ends of the shaft 100, located between the stator and rotor, supporting the rotor and allowing it to rotate smoothly. Their function is to reduce friction, improve efficiency, and help maintain the smoothness and precision of the motor 10's operation. The mounting bases 200 are fixed at both ends of the motor 10, protecting the internal components from external dust and other impurities. Meanwhile, the mounting base 200 also provides a fixed support point for the bearing section 300, helping to maintain the position of the shaft section 100 and ensuring that the rotor can rotate at the correct geometric center. The housing encloses all the above-mentioned components, providing physical protection for the entire motor 10 and also playing a role in heat dissipation. In some designs, the housing may also integrate cooling mechanisms, such as fans or heat sinks, to help control the temperature of the motor 10.

[0055] The bearing portion 300 is usually installed at the outer end of the rotating shaft portion 100, which requires the rotating shaft portion 100 to have more space to accommodate the bearing portion 300. On the other hand, the mounting base 200 also needs to have a more complex structure to support the bearing portion 300.

[0056] This application proposes a motor 10, with reference to... Figures 1-5 As shown, the motor 10 includes a shaft portion 100, a mounting base 200, and a bearing portion 300. The shaft portion 100 has an inwardly recessed side to form a receiving space 110, and the shaft portion 100 includes an opening 111 located on the side, which communicates with the receiving space 110. The mounting base 200 extends at least partially into the receiving space 110 through the opening 111. The bearing portion 300 is disposed in the receiving space 110, and the bearing portion 300 is spaced on the mounting base 200 and abuts against the inner wall of the shaft portion 100.

[0057] It should be noted that the mounting base 200 here can be an end cover, used to mount and support the bearing part 300, providing a stable rotation center for the rotating shaft part 100. In addition, as a closed component at both ends of the motor or other rotating equipment, the end cover can effectively prevent external contaminants (such as dust, moisture, etc.) from entering the motor, thereby protecting the internal components.

[0058] Because the bearing portion 300 is housed within the fixed space 130 inside the shaft portion 100, the overall length of the shaft portion 100 can be reduced. This design saves space and reduces weight, making the motor 10 smaller and more suitable for installation in limited spaces. Furthermore, the shorter shaft portion 100 is easier to install and remove, simplifying the assembly process and making routine maintenance more convenient. In addition, the shorter shaft portion 100 is more stable, reducing the risk of bending and twisting that can occur with a longer shaft. This helps reduce the vibration level of the entire system, thereby improving operational smoothness and reliability.

[0059] The bearing portion 300 is externally positioned to abut against the inner wall of the shaft portion 100. This design provides better support for both the bearing portion 300 and the shaft portion 100, preventing axial movement and reducing vibration and noise during operation, thereby improving equipment efficiency and service life. Furthermore, the bearing portion 300 is internally fitted with the bushing portion with a clearance fit, facilitating the installation and removal of the bearing portion 300. Appropriate clearance allows the bearing portion 300 to slide easily into its intended position without excessive force, thus reducing the risk of damage. Additionally, during mechanical operation, the shaft portion 100 and bearing portion 300 may experience thermal expansion due to friction and heat generation. A proper clearance fit can compensate for this dimensional change to some extent, preventing jamming or excessive stress concentration caused by an overly tight fit.

[0060] In summary, on the one hand, the bearing portion 300 is disposed within the accommodating space 110, thereby reducing the external space required for the rotating shaft portion. On the other hand, the bearing portion 300 and the mounting base 200 are fitted with a clearance fit, which facilitates installation. The bearing portion 300 is abutted against the inner wall of the rotating shaft portion 100, which makes the connection between the bearing portion 300 and the rotating shaft portion 100 more stable, thereby improving the stability of the motor 10.

[0061] In one embodiment, reference Figures 2-4 As shown, the mounting base 200 includes a base body 210 and a sleeve body 220. The base body 210 includes a protruding area 211, which extends from the opening 111 into the receiving space 110. The sleeve body 220 is disposed on the protruding area 211, and the bearing portion 300 is sleeved on the sleeve body 220. It should be noted that the sleeve body 220 can be a bearing race or a bushing, and its material can be metal, such as steel or copper.

[0062] Based on the above configuration, the sleeve 220 can protect the base 210 from excessive wear, especially when the material of the base 210 is relatively soft (e.g., aluminum). By installing a sleeve 220 with higher hardness inside the base 210, this wear can be effectively reduced, extending the service life of the base 210. If wear or damage occurs, the sleeve 220 can be replaced separately. This not only reduces maintenance costs but also simplifies the repair process and reduces equipment downtime.

[0063] In one embodiment, reference Figure 3 and Figure 5 As shown, the sleeve 220 includes a first set of units 221 and a second set of units 222 connected along the length direction X. The first set of units 221 is configured to cooperate with the bearing portion 300. The diameter of the second set of units 222 is larger than that of the first set of units 221 to form a stepped unit 223. The seat 210 is at least partially disposed on the stepped unit 223 for fixing the sleeve 220.

[0064] refer to Figure 3 and Figure 5 As shown, the base 210 also forms a step corresponding to the step unit 223, thereby fixing the sleeve 220 in place. This kind of fit can be achieved by injection molding.

[0065] The stepped unit 223 and the seat 210 work together to provide axial positioning, preventing the steel sleeve from moving axially during installation or operation. In addition, the contact surfaces of the stepped unit 223 and the seat 210 are tightly joined, which improves the rigidity and stability of the connection between the steel sleeve and the end cover, and avoids the steel sleeve from falling off or shifting due to vibration, impact or other reasons.

[0066] In one embodiment, reference Figure 3and Figure 5 As shown, the motor 10 also includes an elastic element 400, which is disposed between the second set unit 222 and the bearing part 300, and is respectively abutted against the second set unit 222 and the bearing part 300.

[0067] It should be noted that the elastic element 400 here can be a wave spring. The elastic element 400, by continuously applying axial pressure, keeps the rolling elements (such as balls) of the bearing portion 300 in close contact with the inner and outer raceways, eliminating clearances caused by manufacturing tolerances or thermal expansion. This preload prevents axial movement or radial loosening of the bearing portion 300 during operation, improves system rigidity, and reduces vibration and noise caused by clearances. Under high-temperature conditions, metal components may undergo dimensional changes due to thermal expansion. The elastic properties of the elastic element 400 allow it to adaptively compress or rebound in the axial direction, counteracting the effect of thermal deformation on the preload of the bearing portion 300, preventing the bearing portion 300 from seizing due to excessive tightness or impact wear due to excessive looseness.

[0068] In one embodiment, reference Figures 1-5 As shown, the distance between the second unit 222 and the bearing part 300 is defined as the first distance. If the first distance is too large, it will occupy too much space inside the motor 10, resulting in an increased overall size of the motor 10. If the first distance is too small, the elastic element 400 located in that space will not be long enough, thus resulting in insufficient elasticity.

[0069] This application sets the first distance to be greater than or equal to 1 mm and less than or equal to 4 mm. For example, the first distance can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm. Within this range, on the one hand, the overall size of the motor 10 will not be too large, and on the other hand, the elastic element 400 located in this space can have sufficient elasticity.

[0070] In one embodiment, reference Figure 3 and Figure 5 As shown, the sleeve 220 and the bearing part 300 have the same hardness.

[0071] When the hardness of the sleeve 220 and the bearing part 300 is close, it can prevent components with excessive hardness from embedding into the surface of soft materials or causing ploughing wear. Similar hardness can reduce loosening or interference caused by differences in the coefficient of thermal expansion.

[0072] In one embodiment, reference continues Figure 3 and Figure 5 As shown, the rotating shaft 100 includes a shoulder unit 120, and the bearing 300 is fitted to the shoulder unit 120.

[0073] Based on the above configuration, the stepped side of the shoulder unit 120 serves as the positioning surface of the inner ring of the bearing section 300, restricting the axial displacement of the bearing section 300. The shoulder unit 120 directly bears the axial force (such as gear meshing thrust and transmission shaft inertial force) transmitted by the bearing section 300 and distributes the load to the rotating shaft section 100, thereby ensuring the stability of the motor 10.

[0074] In one embodiment, reference Figures 2-5 As shown, the mounting base 200 includes an oil delivery channel 230, and the motor 10 includes a rotor oil pipe 500. The rotor oil pipe 500 is mounted on the mounting base 200 and is connected to the oil delivery channel 230.

[0075] The cooling oil in the rotor oil pipe 500 flows through the oil pipe or oil passage inside the shaft section 100, directly carrying away the heat generated by the rotor core and magnets. The cooling oil can smoothly enter the shaft section 100 through the cooperation between the mounting base 200 and the internal oil passage 230.

[0076] In one embodiment, reference Figure 3 and Figure 5 As shown, the rotor oil pipe 500 includes a side nozzle 510, which can be connected to the bearing section 300. Liquid is input into the rotor oil pipe 500 from the oil supply channel 230, and then sprayed onto the bearing section 300 from the side nozzle 510 of the rotor oil pipe 500.

[0077] Based on the above configuration, the rotor oil pipe 500 can supply liquid to the bearing section 300, thereby reducing the space occupied by external pipelines while dissipating heat from the bearing section 300. In addition, the liquid can also serve as a lubricant and filter.

[0078] Furthermore, this application embodiment also provides an electric drive assembly, which includes the motor 10 and the reducer described in any of the above embodiments or implementations. The output end of the rotating shaft of the motor 10 is connected to the power input shaft of the reducer, and the motor 10 can transmit power to the power input shaft when it is working.

[0079] The reducer and motor 10 can be separate or integrated into one unit. In one specific embodiment, the reducer and motor 10 are integrated, and at least a portion of the reducer is also housed within the housing.

[0080] In one embodiment, the electric drive assembly may further include an oil pump and a heat exchanger, the heat exchanger being used to cool the returning cooling oil and the oil pump being used to drive the cooling oil to flow in the oil passage.

[0081] Furthermore, the aforementioned vehicles include any of the aforementioned motors 10 or electric drive assemblies.

[0082] The vehicle can be a car, truck, van, SUV, or any other type of vehicle equipped with a battery. In one embodiment, the vehicle is a high-voltage traction battery-powered electric vehicle (e.g., a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), etc.). In another embodiment, the vehicle is an autonomous vehicle, wherein the vehicle's maneuverability is controlled without direct input from a human driver.

[0083] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An electric motor, characterized in that, The motor includes: The rotating shaft portion has its side recessed inward to form a receiving space, and the rotating shaft portion includes an opening located on the side, which is connected to the receiving space. Mounting base, wherein the mounting base extends at least partially from the opening into the receiving space; The bearing portion is disposed in the receiving space, and the bearing portion is spaced on the mounting base and abuts against the inner wall of the rotating shaft portion.

2. The motor as described in claim 1, characterized in that, The mounting base includes a base body and a sleeve body. The base body includes a protruding area that extends into the receiving space from the opening. The sleeve body is disposed on the protruding area, and the bearing portion is sleeved on the sleeve body.

3. The motor as described in claim 2, characterized in that, The sleeve includes a first set of units and a second set of units connected along the length direction, wherein the first set of units is configured to cooperate with the bearing portion; The diameter of the second set of units is larger than that of the first set of units to form a stepped unit, and the seat is at least partially disposed on the stepped unit for fixing the set.

4. The motor as described in claim 3, characterized in that, The motor also includes an elastic element, which is disposed between the second set of units and the bearing portion, and abuts against the second set of units and the bearing portion respectively.

5. The motor as described in claim 4, characterized in that, Let the distance between the second unit and the bearing be the first distance, where the first distance is greater than or equal to 1 mm and less than or equal to 4 mm.

6. The motor as described in claim 2, characterized in that, The sleeve has the same hardness as the bearing portion.

7. The motor as described in claim 1, characterized in that, The rotating shaft includes a shoulder unit, and the bearing is fitted to the shoulder unit.

8. The motor as described in claim 1, characterized in that, The mounting base includes an oil delivery channel, and the motor includes a rotor oil pipe. The rotor oil pipe is disposed on the mounting base and is connected to the oil delivery channel.

9. The motor as described in claim 8, characterized in that, The rotor oil pipe includes a side nozzle, which can be connected to the bearing section; Liquid is fed into the rotor oil pipe through the self-flowing oil channel, and then sprayed onto the bearing section through the side nozzle of the rotor oil pipe.

10. An electric drive assembly, characterized in that, include: The motor as described in any one of claims 1-9.

11. A vehicle, characterized in that, include: The electric drive assembly as described in claim 10.

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