Electric power steering system and vehicle therefor

Abstract

The application relates to an electric power steering system and a vehicle thereof, which comprises a steering gear, a motor controller and a steering motor, the steering motor comprising a shell, a rotor assembly and a stator assembly, the shell being provided with a containing cavity; the rotor assembly is located in the containing cavity and rotationally connected with the shell, the rotor assembly is located outside the containing cavity and transmissionally connected with the steering gear; the stator assembly is located between the shell and the rotor assembly, the stator assembly is spaced apart from the rotor assembly and connected with the shell; wherein the stator assembly comprises a stator core and a stator winding, the stator winding comprises a winding part and a connecting part, the winding part is located in the containing cavity and wound on an insulation framework of the stator core; a part of the connecting part is connected with a busbar, and another part of the connecting part is located outside the containing cavity and connected with the motor controller. The electric power steering system and the vehicle thereof are beneficial to simplifying the internal structure of the steering motor, improving the production efficiency of the steering motor, saving cost and adapting to the demand of multi-vehicle platform.

Description

Technical Field

[0001] This application belongs to the technical field of automotive electric power steering systems, specifically relating to an electric power steering system and its vehicle. Background Technology

[0002] Electric power steering (EPS) is a power steering system that relies directly on an electric motor to provide auxiliary torque. As an important factor affecting the driving experience and handling of a vehicle, the optimization and upgrading of the performance of electric power steering is particularly important.

[0003] However, existing electric power steering systems mainly use a pin-type connection structure for the steering motor and motor controller, and the bus design is relatively complex, resulting in a complex steering motor design structure, low production efficiency, high cost, and low versatility. Utility Model Content

[0004] The purpose of this application is to provide an electric power steering system and vehicle thereof, which is conducive to simplifying the internal structure of the steering motor, improving the production efficiency of the steering motor, saving costs, and adapting to the needs of multi-model platformization.

[0005] This application discloses an electric power steering system, comprising: a steering gear, a motor controller, and a steering motor. The steering motor includes: a housing, a rotor assembly, and a stator assembly. The housing has a receiving cavity. A portion of the rotor assembly is located within the receiving cavity and is rotatably connected to the housing. Another portion of the rotor assembly is located outside the receiving cavity and is drively connected to the steering gear. The stator assembly is located between the housing and the rotor assembly, spaced apart from the rotor assembly, and connected to the housing. The stator assembly includes a stator core and stator windings. The stator windings include interconnected winding portions and connecting portions. The winding portions are located within the receiving cavity and wound around the insulating frame of the stator core to prevent contact between the winding portions and the stator core, thus avoiding damage to the insulation layer of the winding portions. The connecting portions pass through the housing. A portion of the connecting portions is connected to a busbar to conduct the three-phase windings of the motor, and another portion of the connecting portions is located outside the receiving cavity and is connected to the motor controller.

[0006] In one exemplary embodiment of this application, the stator winding includes a first group of three-phase windings and a second group of three-phase windings that are spaced apart from each other and arranged opposite to each other. Both the first group of three-phase windings and the second group of three-phase windings include the winding portion and the connecting portion. The distance between the connecting portion of the first group of three-phase windings and the connecting portion of the second group of three-phase windings remains unchanged.

[0007] In one exemplary embodiment of this application, the rotor assembly includes a rotating shaft, a rotor core, and a magnetic tile assembly. A portion of the rotating shaft is located within the receiving cavity and is rotatably connected to the housing, while another portion of the rotating shaft is located within the housing. The rotor is located outside the cavity and is connected to the steering gear for transmission; the rotating shaft located inside the cavity passes through the rotor core and is interference-fitted with the rotor core; the magnetic tile assembly is connected to the outer periphery of the rotor core.

[0008] In one exemplary embodiment of this application, the outer periphery of the rotor core is provided with a mounting groove, the magnetic tile assembly is located in the mounting groove and is connected to the groove wall of the mounting groove.

[0009] In one exemplary embodiment of this application, the rotor core includes a plurality of core portions, which are arranged sequentially along the axial direction of the rotating shaft, and adjacent core portions are connected to each other.

[0010] In one exemplary embodiment of this application, the magnetic tile assembly includes a plurality of magnetic tile portions, which are connected one-to-one to the outer periphery of a plurality of iron core portions; each magnetic tile portion includes a plurality of magnetic tiles, which are spaced apart from each other; wherein, the magnetic tiles of any two magnetic tile portions are staggered from each other.

[0011] In one exemplary embodiment of this application, the electric power steering system further includes a first bearing and a second bearing located within the accommodating cavity. The first bearing is further away from the connecting portion than the second bearing. The first bearing and the second bearing are located on two opposite sides of the rotor core along the axial direction of the rotating shaft. Both the first bearing and the second bearing are interference-fitted with the rotating shaft. The first bearing is riveted to the housing, and the second bearing is clearance-fitted with the housing.

[0012] In one exemplary embodiment of this application, the outer diameters of the first bearing and the second bearing are in the range of 30mm-34mm.

[0013] In one exemplary embodiment of this application, the housing includes an outer shell portion and an end cap portion, the accommodating cavity is located in the outer shell portion, the end cap portion covers the opening of the accommodating cavity, the end cap portion is detachably connected to the outer shell portion, and the connecting portion passes through the end cap portion and is connected to the end cap portion.

[0014] A second aspect of this application discloses a vehicle including a power supply system and an electric power steering system as described in any of the preceding claims, wherein the electric power steering system is connected to the power supply system.

[0015] The proposed solution has the following beneficial effects: In this embodiment, the stator winding includes a winding portion and a connecting portion. The winding portion located within the accommodating cavity is connected to the connecting portion, which passes through the housing. At least a portion of the connecting portion is located outside the accommodating cavity, allowing the connecting portion of the stator winding to be connected to the motor controller via a simple busbar, without the need for a complex busbar and pins. This eliminates the need for complex busbar design and multiple welding processes, simplifying the internal structure of the steering motor, improving its production efficiency, saving costs, and adapting to the platform requirements of multiple vehicle models.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. The drawings herein are for illustrating the inventive concept of this application and are not entirely equivalent to the structure of the actual product protected by this application.

[0018] Figure 1 shows a three-dimensional structural diagram of the steering motor in an embodiment of this application from a first perspective.

[0019] Figure 2 shows a three-dimensional structural diagram of the steering motor in an embodiment of this application from a second perspective.

[0020] Figure 3 shows a three-dimensional structural diagram of the steering motor in the embodiment of this application from a third-person perspective.

[0021] Figure 4 illustrates an embodiment of this application. Figure 3 A cross-sectional view of the steering motor AA without stator assembly, rotor core and magnet assembly.

[0022] Figure 5 shows a front view of the rotor assembly, the first bearing, and the second bearing connection in an embodiment of this application.

[0023] Figure 6 shows a three-dimensional structural diagram of the stator core in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 1. Steering motor; 101. Receiving cavity; 102. Heat dissipation area; 103. First PCB board mounting hole; 104. Second PCB board mounting hole; 105. Third PCB board mounting hole; 11. Housing; 111. Outer shell; 112. End cover; 12. Rotor assembly; 121. Shaft; 121a. Internal part; 121b. Exposed part; 122. Rotor core; 122a. Core part; 123. Magnet assembly; 1231. Magnet part; 1231a. Magnet; 131. Stator core; 132. Stator winding; 1321. First set of three-phase windings; 1322. Second set of three-phase windings; 14. Pulley; 2. First bearing; 3. Second bearing; a. Connecting part. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0026] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0027] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the following description... The technical features involved in the various embodiments of this application can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0028] As shown in Figures 1 to 6, this embodiment provides an electric power steering system, including: a steering gear, a motor controller, and a steering motor 1. The steering motor 1 includes: a housing 11, a rotor assembly 12, and a stator assembly. The housing 11 has a receiving cavity 101. Part of the rotor assembly 12 is located inside the receiving cavity 101 and is rotatably connected to the housing 11. Another part of the rotor assembly 12 is located outside the receiving cavity 101 and is drively connected to the steering gear. The stator assembly is located between the housing 11 and the rotor assembly 12. The stator assembly and the rotor assembly 12 are spaced apart and connected to the housing 11.

[0029] Furthermore, the stator assembly includes a stator core 131 and a stator winding 132. The stator winding 132 includes a winding portion and a connecting portion a connected to each other. The winding portion is located inside the accommodating cavity 101 and is wound on the insulating frame of the stator core 131 to avoid contact between the winding portion and the stator core 131, which would cause damage to the insulation layer of the winding portion. The connecting portion a passes through the housing 11. A part of the connecting portion a is connected to the busbar to enable the three-phase winding of the motor to conduct, and another part of the connecting portion a is located outside the accommodating cavity 101 and is connected to the motor controller.

[0030] For information on the bus structure, please refer to existing technologies; details will not be elaborated here.

[0031] It should be understood that, since connection part a needs to be connected to the motor controller, connection part a should be insulated from housing 11 to ensure electrical safety. At the same time, the winding section is provided with an insulating layer, which is insulated from the stator core and also serves to insulate and isolate the winding section from housing 11.

[0032] In this embodiment, the stator winding 132 includes a winding portion and a connecting portion a. The winding portion located in the accommodating cavity 101 is connected to the connecting portion a. The connecting portion a passes through the housing 11, and at least a portion of the connecting portion a is located outside the accommodating cavity 101. This allows the connecting portion a of the stator winding 132 to be connected to the motor controller via a simple busbar, without the need for a complex busbar and pins. This eliminates the need for complex busbar design and multiple welding processes, which simplifies the internal structure of the steering motor 1, improves the production efficiency of the steering motor 1, saves costs, and adapts to the platform requirements of multiple vehicle models.

[0033] In this embodiment, the stator winding 132 includes a first group of three-phase windings 1321 and a second group of three-phase windings 1322 that are spaced apart from each other and arranged opposite to each other. Both the first group of three-phase windings 1321 and the second group of three-phase windings 1322 include a winding portion and a connecting portion a.

[0034] In this embodiment, the stator core 131 is wound by stator windings 132 to form six windings. These six windings are then divided into two independent three-phase windings: a first three-phase winding 1321 (U1 / V1 / W1) and a second three-phase winding 1322 (U2 / V2 / W2). Specifically, V1 of the first three-phase winding 1321 is opposite to V2 of the second three-phase winding 1322; U1 of the first three-phase winding 1321 is opposite to W2 of the second three-phase winding 1322; and W1 of the first three-phase winding 1321 is opposite to U2 of the second three-phase winding 1322. This six-phase full redundancy design improves the safety level of the steering motor 1, thereby significantly enhancing the overall vehicle safety and reliability.

[0035] Specifically, when the first three-phase winding 1321 is damaged and cannot work normally, the second three-phase winding 1322 can still work normally; when the second three-phase winding 1322 is damaged and cannot work normally, the first three-phase winding 1321 can still work normally.

[0036] Furthermore, the distance between the connection part a of the first three-phase winding 1321 and the connection part a of the second three-phase winding 1322 remains unchanged.

[0037] In this embodiment, the housing 11 is provided with a heat dissipation area 102, which is located between the connection portion a of the first set of three-phase windings 1321 and the connection portion a of the second set of three-phase windings 1322. Furthermore, the electric power steering system also includes a PCB board. The housing 11 is provided with a first PCB board mounting hole 103, a second PCB board mounting hole 104, and a third PCB board mounting hole 105. The PCB board is connected to the housing 11 of the steering motor 1 by fasteners passing through the first PCB board mounting hole 103, the second PCB board mounting hole 104, and the third PCB board mounting hole 105, and the PCB board at least partially overlaps with the heat dissipation area 102.

[0038] For example, fasteners can be bolts or screws.

[0039] In this embodiment, the connection portion a of the first group of three-phase windings 1321 and the connection portion a of the second group of three-phase windings 1322 are both arranged in a straight line, and the distance between the connection portion a of the first group of three-phase windings 1321 and the connection portion a of the second group of three-phase windings 1322 remains unchanged. Compared with the arc-shaped arrangement of the prior art, the distance between V1 of the first group of three-phase windings 1321 and V2 of the second group of three-phase windings 1322 is the same, while the distance between U1 of the first group of three-phase windings 1321 and W2 of the second group of three-phase windings 1322 is increased. The increased distance between W1 of the first group of three-phase windings 1321 and U2 of the second group of three-phase windings 1322 results in an increased area of ​​the heat dissipation area 102, which in turn helps to improve the heat dissipation efficiency of the steering motor 1.

[0040] It should be understood that, since the stator core 131 is cylindrical, the stator winding 132 in the prior art is circular after being wound around the stator core 131.

[0041] In other embodiments, the distance between V1 of the first three-phase winding 1321 and V2 of the second three-phase winding 1322 can also be increased compared to the arc-shaped arrangement of the prior art.

[0042] Referring to Figures 4 and 5, the rotor assembly 12 includes a rotating shaft 121, a rotor core 122, and a magnetic tile assembly 123. Part of the rotating shaft 121 is located inside the accommodating cavity 101 and is rotatably connected to the housing 11. The other part of the rotating shaft 121 is located outside the accommodating cavity 101 and is drively connected to the steering gear. The rotating shaft 121 located inside the accommodating cavity 101 passes through the rotor core 122 and is interference-fitted with the rotor core 122. The magnetic tile assembly 123 is connected to the outer periphery of the rotor core 122.

[0043] In this embodiment, the rotating shaft 121 includes an internal portion 121a and an exposed portion 121b connected to each other. The internal portion 121a is located inside the accommodating cavity 101 and is rotatably connected to the housing 11. The exposed portion 121b is located outside the accommodating cavity 101 and is drive-connected to the steering gear. The internal portion 121a passes through the rotor core 122 and is interference-fitted with the rotor core 122. In addition, the steering motor 1 also includes a pulley 14 for connection with the steering gear. The pulley 14 is located outside the accommodating cavity 101, connected to the exposed portion 121b, and drive-connected to the steering gear.

[0044] In this embodiment, the magnetic tile assembly 123 is connected to the outer periphery of the rotor core 122, eliminating the need to set magnetic slots inside the rotor core 122. This not only reduces the requirements for software and hardware control, but also makes the structure of the rotor core 122 more uniform and the air gap magnetic field distribution smoother, thereby reducing motor noise.

[0045] In this embodiment, the outer periphery of the rotor core 122 is provided with a mounting groove, and the magnetic tile assembly 123 is located in the mounting groove and connected to the groove wall, so that the magnetic tile assembly 123 can be accurately installed in the mounting groove, avoiding abnormal performance of the steering motor 1 due to incorrect contact position and angle of the magnetic tile assembly 123. As shown in Figure 5, the rotor core 122 includes multiple core parts 122a, which are arranged sequentially along the axial direction of the rotating shaft 121, and adjacent core parts 122a are connected to each other.

[0046] It should be understood that "multiple" refers to two or more quantities, such as two, three, etc. The number of core sections 122a can be selected according to the actual situation.

[0047] For example, the number of core sections 122a can be three, four, five, etc.

[0048] In this embodiment, the rotor core 122 includes three core sections 122a, which are arranged sequentially along the axial direction of the shaft 121, and adjacent core sections 122a are connected to each other. Dividing the rotor core 122 into three core sections 122a and stacking them in a staggered manner can effectively reduce noise and cogging torque. As shown in Figure 5, the magnetic tile assembly 123 includes multiple magnetic tile sections 1231, which are connected one-to-one to the outer periphery of multiple core sections 122a; each magnetic tile section 1231 includes multiple magnetic tiles 1231a, which are spaced apart from each other.

[0049] In this embodiment, the magnetic tile assembly 123 includes three magnetic tile portions 1231, which are arranged sequentially along the axial direction of the rotating shaft 121. Each of the three magnetic tile portions 1231 is connected to the outer periphery of one of the three iron core portions 122a. The outer periphery of the rotor iron core 122 is provided with eight mutually spaced mounting slots; each of the three magnetic tile portions 1231 includes eight magnetic tiles 1231a, which are arranged mutually spaced and installed one-to-one in the eight mounting slots.

[0050] Furthermore, the multiple magnetic tiles 1231a of any two magnetic tile sections 1231 are staggered with each other.

[0051] It should be understood that the eight magnetic tiles 1231a of any two magnetic tile sections 1231 are staggered with each other, that is, the eight magnetic tiles 1231a of one magnetic tile section 1231 are staggered with the eight magnetic tiles 1231a of another magnetic tile section 1231 along the axial direction of the rotating shaft 121.

[0052] In this embodiment, the magnetic tile assembly 123 adopts a three-segment surface-mount skewed pole method, which not only helps to reduce the generation of electromagnetic clutter, but also helps to reduce electromagnetic noise.

[0053] For example, each of the three magnetic tile sections 1231 is offset by 2°-5°, that is, the total slant angle is 6°-15°.

[0054] As shown in Figures 4 and 5, the electric power steering system also includes a first bearing 2 and a second bearing 3 located in the accommodating cavity 101. The first bearing 2 is further away from the connecting part a than the second bearing 3. The first bearing 2 and the second bearing 3 are located on two opposite sides of the rotor core 122 along the axial direction of the shaft 121. The inner rings of the first bearing 2 and the second bearing 3 are both interference-fitted with the shaft 121. The outer ring of the first bearing 2 is riveted to the housing 11, and the outer ring of the second bearing 3 is clearance-fitted with the housing 11.

[0055] In this embodiment, the rotating shaft 121 is supported by the first bearing 2 and the second bearing 3, which helps improve the stability of the rotating shaft 121 during operation and avoids rubbing between the rotor assembly 12 and the stator assembly. In addition, the first bearing 2 and the second bearing 3 can jointly bear the radial load, which helps extend the service life of the first bearing 2 and the second bearing 3.

[0056] In this embodiment, the outer diameters of the first bearing 2 and the second bearing 3 range from 30mm to 34mm. Compared with the prior art, the outer diameters of the first bearing 2 and the second bearing 3 are larger, and the first bearing 2 and the second bearing 3 can withstand greater radial loads, making the first bearing 2 and the second bearing 3 less prone to damage, thus ensuring the normal operation of the first bearing 2 and the second bearing 3.

[0057] It should be understood that the outer diameter of the first bearing 2 and the second bearing 3 in the prior art ranges from 24mm to 28mm.

[0058] For example, the outer diameters of the first bearing 2 and the second bearing 3 can be 30mm, 32mm, 34mm, etc.

[0059] Referring to Figures 3 and 4, the housing 11 includes an outer shell portion 111 and an end cap portion 112. The accommodating cavity 101 is located in the outer shell portion 111. The end cap portion 112 covers the opening of the accommodating cavity 101. The end cap portion 112 is detachably connected to the outer shell portion 111. The connecting portion a passes through the end cap portion 112 and is connected to the end cap portion 112.

[0060] In this embodiment, the outer casing 111 and the end cover 112 are detachably connected by bolts to facilitate maintenance of the steering motor 1, thereby effectively saving costs.

[0061] This embodiment also provides a vehicle, including a power system and the above-described electric power steering system, wherein the electric power steering system is connected to the power system.

[0062] For other aspects of the vehicle's structure, please refer to existing technology; details will not be elaborated here.

[0063] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" can be clearly understood... The term "multiple" implies or implies one or more of the features. "Multiple" means two or more, unless otherwise explicitly specified. The terms "some embodiments," "exemplarily," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application.

[0065] The illustrative expressions of the terms used above do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples, without contradiction.

[0066] Although embodiments of this application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of the patent coverage of this application.

Claims

1. An electric power steering system, characterized in that, include: Steering gear, motor controller, and steering motor, wherein the steering motor includes: The housing has a receiving cavity; A rotor assembly, a portion of which is located within the accommodating cavity and rotatably connected to the housing, and another portion of which is located outside the accommodating cavity and drively connected to the steering gear; A stator assembly is located between the housing and the rotor assembly, the stator assembly and the rotor assembly being spaced apart and connected to the housing; wherein... The stator assembly includes a stator core and a stator winding. The stator winding includes a winding portion and a connecting portion connected to each other. The winding portion is located inside the accommodating cavity and is wound around the insulating skeleton of the stator core to avoid contact between the winding portion and the stator core, which would damage the insulation layer of the winding portion. The connecting portion passes through the housing. A portion of the connecting portion is connected to the busbar to enable the three-phase windings of the motor to conduct, while another portion of the connecting portion is located outside the accommodating cavity and is connected to the motor controller.

2. The electric power steering system according to claim 1, characterized in that, The stator winding includes a first group of three-phase windings and a second group of three-phase windings that are spaced apart from each other and arranged opposite to each other. Both the first group of three-phase windings and the second group of three-phase windings include the winding portion and the connecting portion. The distance between the connection part of the first group of three-phase windings and the connection part of the second group of three-phase windings remains unchanged.

3. The electric power steering system according to claim 1, characterized in that, The rotor assembly includes a rotating shaft, a rotor core, and a magnetic tile assembly. Part of the rotating shaft is located inside the accommodating cavity and is rotatably connected to the housing. The other part of the rotating shaft is located outside the accommodating cavity and is drively connected to the steering gear. The rotating shaft located inside the accommodating cavity passes through the rotor core and is interference-fitted with the rotor core. The magnetic tile assembly is connected to the outer periphery of the rotor core.

4. The electric power steering system according to claim 3, characterized in that, The rotor core has an installation groove on its outer periphery, and the magnetic tile assembly is located in the installation groove and connected to the groove wall.

5. The electric power steering system according to claim 3, characterized in that, The rotor core includes multiple core sections, which are arranged sequentially along the axial direction of the rotating shaft, and adjacent core sections are connected to each other.

6. The electric power steering system according to claim 5, characterized in that, The magnetic tile assembly includes multiple magnetic tile portions, and the multiple magnetic tile portions are connected one-to-one to the outer periphery of the multiple iron core portions; The magnetic tile section includes multiple magnetic tiles, which are spaced apart from each other; wherein... The multiple magnetic tiles of any two magnetic tile sections are staggered with each other.

7. The electric power steering system according to claim 3, characterized in that, The electric power steering system also includes a first bearing and a second bearing located within the accommodating cavity. The first bearing is further away from the connecting part than the second bearing. The first bearing and the second bearing are located on two opposite sides of the rotor core along the axial direction of the shaft. Both the first bearing and the second bearing are interference-fitted with the shaft. The first bearing is riveted to the housing, and the second bearing is clearance-fitted with the housing.

8. The electric power steering system according to claim 7, characterized in that, The outer diameter of the first bearing and the second bearing ranges from 30mm to 34mm.

9. The electric power steering system according to claim 1, characterized in that, The housing includes an outer shell portion and an end cap portion. The accommodating cavity is located in the outer shell portion. The end cap portion seals the opening of the accommodating cavity. The end cap portion is detachably connected to the outer shell portion. The connecting portion passes through the end cap portion and is connected to the end cap portion.

10. A vehicle, characterized in that, It includes a power supply system and an electric power steering system as described in any one of claims 1-9, wherein the electric power steering system is connected to the power supply system.

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