Vehicle steering motor assembly and manufacturing method

Abstract

The invention relates to the technical field of automobile power assemblies, in particular to an automobile steering motor assembly and a manufacturing method, the automobile steering motor assembly is manufactured and assembled on a machining line, the automobile steering motor assembly comprises a machine shell, one side of the machine shell and a front end cover are installed through fastening screws, and the other side of the machine shell and the front end cover are installed through fastening screws. The motor assembly comprises a front end cover and a casing, stable sealing connection between the front end cover and the casing is ensured, a clamping jaw is arranged on one side of the front end cover and serves as a torque transmission interface of the motor assembly, an O-shaped ring is arranged on the inner side of the front end cover and used for improving the sealing performance of the connecting position of the front end cover and the casing, and a rotor assembly is arranged on one side of the clamping jaw. Through the technological processes of precise engraving, heating assembly, cooling fixation, cleaning lubrication, strict detection and the like, high-precision manufacturing and stable assembly of the vehicle steering motor assembly are ensured, and the problems that an existing vehicle motor assembly is insufficient in sealing performance, prone to being eroded by the environment and insufficient in structural strength are solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile powertrain, and in particular to a vehicle steering motor assembly and a manufacturing method thereof. Background Art

[0002] In the current automobile manufacturing industry, the electric power steering system has become a core component to improve driving experience and vehicle controllability, and is widely used in various models. Among them, the automotive steering motor assembly, as the power source of the system, sometimes needs to be installed outside the cab, so it is particularly important to cope with complex driving environments. This type of motor assembly needs to accurately respond to the driver's steering needs and adjust the output torque according to the vehicle's driving status to achieve smooth and precise steering assistance.

[0003] However, due to its outdoor installation characteristics, more stringent requirements are placed on the waterproof, dustproof and weather-resistant performance of the motor assembly. Although the existing automotive motor steering assemblies on the market have made certain progress, they still expose significant defects such as insufficient sealing, susceptibility to external environmental erosion, and insufficient structural strength when dealing with extreme weather conditions (such as water accumulation caused by heavy rain) and vibrations and impacts under complex road conditions. These problems not only affect the normal operation of the motor assembly, but are also likely to cause damage to internal components due to water ingress and dust accumulation, thereby shortening the service life of the motor assembly and reducing vehicle driving safety. Summary of the invention

[0004] The present invention innovatively designs an electric power steering motor and an assembly method for an environment outside the cab, aiming to effectively solve the problems of insufficient waterproofing and dustproofing and component strength in the prior art by optimizing the sealing structure, enhancing material durability and structural design, and ensuring stable operation and long life of the motor in harsh environments.

[0005] To achieve the above object, the present invention provides the following technical solutions: A vehicle steering motor assembly, the vehicle steering motor assembly is manufactured and assembled on a processing line, the vehicle steering motor assembly includes a housing One side of the housing is installed with the front cover by fastening screws to ensure a stable sealing connection between the front cover and the housing. A claw is provided on one side of the front cover, and the claw serves as a torque transmission interface of the motor assembly. An O-ring is provided on the inner side of the front cover to improve the sealing of the connection between the front cover and the housing. A rotor assembly is provided on one side of the claw, and a stator assembly is also provided in the inner cavity of the housing. The stator assembly generates a rotating magnetic field after power is turned on and interacts with the rotor assembly to drive the rotor assembly to rotate continuously. A locking device is also provided on the inner side of the front end cover, and the locking device includes a double locking mechanism. The first locking mechanism is an elastic ring, and the second locking mechanism is provided on the inner side of the elastic ring and includes a lower locking ring and an upper locking ring. The lower locking ring and the upper locking ring provide a fastening force to the connection between the front end cover and the casing. The inner cavity of the lower locking ring is provided with two mutually meshing gears. By controlling the rotation of one of the gears, the distance between the lower locking ring and the upper locking ring can be adjusted to achieve precise adjustment of the gap between the casing and the front end cover.

[0006] Preferably, a flexible rack is provided at both ends of the inner cavity of the lower locking ring, and the flexible rack is meshed with the gear. A linkage groove is provided in the inner cavity of the upper locking ring, and one end of the flexible rack is located in the inner cavity of the linkage groove. A blocking block is provided in the linkage groove, and the blocking block and the tooth groove of the flexible rack are arranged in opposite directions.

[0007] Preferably, an elastic ring is further provided on the inner side of the locking device, a number of springs are provided on the outer side of the elastic ring, one end of the blocking block is fixedly connected to an unlocking shaft, and one side of the unlocking shaft protrudes from the surface of the front end cover.

[0008] Preferably, the other side of the housing is set as an ECU mounting surface, and a magnetic support is provided on the surface of the ECU mounting surface. The ECU mounting surface is used to receive signals from a torque sensor and a vehicle speed sensor, and the magnetic support is used to capture angle changes during rotation.

[0009] Preferably, a rear bearing and a front bearing are respectively provided at both ends of the rotor assembly inside the casing, and the rear bearing and the front bearing are used to support and guide the rotation of the rotor assembly. A wave spring washer is also provided at the connection between the rear bearing and the casing, and the wave spring washer is configured as a wave structure.

[0010] A method for manufacturing a steering motor assembly for a vehicle comprises the following steps: S1: placing a housing and a stator assembly at the starting position of an assembly line respectively, using a laser engraving device to precisely engrave a mark on the housing for easy tracking and management, and using a heating device to heat the housing for easy insertion of the stator assembly; S2: The stator assembly is inserted into the heated housing through the first assembly equipment, and the insertion position is checked by the laser inspection machine to ensure that the assembly position is accurate. If it fails, it will be removed from the production line; S3: Cooling the casing in a cooling furnace to prepare for subsequent processes, firmly fixing the stator assembly in the casing through the first riveting equipment, and performing secondary positioning; S4: Use a cleaning device to insert a through gauge into the inner hole of the stator assembly to ensure that the size requirements of the stator assembly are met and that the rotor assembly can be inserted normally. Use the through gauge of the cleaning device to clean the dust and impurities in the casing to meet the motor cleanliness requirements. Use an AOI scanner to perform an image inspection of the casing to ensure assembly quality. Use a placement device to place a wave spring washer into the connection between the stator assembly and the casing. Use a lubricating machine to evenly apply lubricating oil to the installation positions of the rear bearing and the front bearing inside the casing to reduce friction and wear and extend the service life of the bearing. S5: Load the front end cover and the built-in front bearing through the loading equipment, and at the same time load the O-ring into the connection between the front end cover and the casing, and insert the rotor assembly into the wave spring washer through the loading equipment, and at the same time press the rear bearing into the other end of the rotor assembly, and then install the rotor assembly with the front end cover, the rear bearing and the front bearing into the casing, and screw the fastening screws into the mounting holes through the second riveting equipment to complete the connection between the casing and the front end cover; S6: Press the claws in with a press machine and check the coaxiality with a coaxiality detector. Press the magnetic support in with a press machine and check the magnetic support. Test the assembled motor assembly with a test chamber for friction torque, back electromotive force, motor load vibration and abnormal sound to ensure that the motor assembly is qualified.

[0011] Preferably, the stator assembly process in S1 includes: laser coding the single-lobe iron core by laser engraving equipment, then making the single-lobe iron core enter the winding stage, and firmly welding multiple single-lobe iron cores by welding equipment to form a complete stator skeleton, and then installing the busbar at one end of the single-lobe iron core.

[0012] Preferably, the installation process of the rotor assembly in S5 includes: laser coding the main iron core by laser engraving equipment, preheating the main iron core by heating equipment, and then attaching the magnet to the outside of the main iron core, and then standing it to solidify.

[0013] Preferably, after the rotor assembly is cured at rest, the performance parameters of the rotor assembly are verified by inspecting the machine chamber, and the rotor assembly is cleaned by a cleaning device. After passing the inspection, the rotor assembly is installed in the casing.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by adding a double locking mechanism at the joint between the front cover and the housing, the stability of the connection is significantly improved. The locking ring included in the mechanism can not only maintain tightness under normal conditions, but also automatically provide additional locking force when encountering vibration impact, effectively preventing the front cover and the housing from loosening;

[0015] 2. In the present invention, through the process of precise engraving, heating assembly, cooling fixation, cleaning lubrication and strict testing, the high-precision manufacturing and stable assembly of the vehicle steering motor assembly are ensured, the sealing performance and structural strength of the motor are enhanced, and the extreme weather and complex road conditions are effectively dealt with, the steering requirements are accurately responded to, the service life is extended, and the problems of insufficient sealing, susceptibility to environmental erosion and insufficient structural strength of the existing vehicle motor assembly are solved; 3. In the present invention, the high precision and high quality of the stator assembly are ensured through the steps of precise feeding, laser coding, CNC winding, assembly welding, busbar installation and strict testing. At the same time, the processes of preheating the rotor assembly, precise attachment of magnets, installation of the rotor shaft and curing treatment further improve the performance and durability of the motor, and further improve the sealing, vibration resistance and strength of the automotive motor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A process flow chart for manufacturing the motor rotor in the present invention; Figure 2 It is a schematic diagram of the overall structure of the motor rotor in the present invention; Figure 3 It is a schematic diagram of the overall structure explosion of the motor rotor in the present invention; Figure 4 This is a schematic diagram of the ECU mounting surface structure of the motor rotor in the present invention; Figure 5 For the present invention Figure 3 Schematic diagram of the overall structure of the middle and front end cover; Figure 6 For the present invention Figure 3 Schematic diagram of the overall structure of the stator assembly; Figure 7 For the present invention Figure 3 Schematic diagram of the overall structure of the middle rotor assembly; Figure 8 For the present invention Figure 5 Schematic diagram of the overall structure of the middle locking device; Fig. 9 For the present invention Figure 8 The overall structural cross-section of the middle and lower locking ring; Fig.10 For the present invention Figure 8 Schematic diagram of the overall structure of the middle and upper locking ring; Fig.11 For the present invention Figure 1 The enlarged schematic diagram of the middle left part; Fig.12 For the present invention Figure 1 The right part of the middle part is enlarged; In the figure: 1. housing; 11. magnetic support; 12. fastening screw; 13. mounting hole; 14. ECU mounting surface; 2. front cover; 21. O-ring; 22. locking device; 221. elastic ring; 222. lower locking ring; 2221. flexible rack; 2222. gear; 223. upper locking ring; 2231. linkage groove; 2232. blocking block; 2233. unlocking shaft; 3. wave spring washer; 4. rear bearing; 5. rotor assembly; 51. main iron core; 52. magnet; 6. front bearing; 7. claw; 8. processing line; 81. assembly line ;82. Laser engraving equipment;83. Heating equipment;84. First assembly equipment;85. Laser inspection machine;86. Cooling furnace;87. First riveting equipment;88. AOI scanner;89. Cleaning equipment;810. Putting equipment;811. Lubricating machine;812. Feeding equipment;813. Second riveting equipment;814. Pressing machine;815. Inspection machine chamber;816. Welding equipment;817. CNC winding machine;818. Coaxiality inspection machine;819. Abnormal sound testing machine;9. Stator assembly;91. Busbar;92. Single-lobe core. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] See also Figure 1-Figure 12 , the present invention provides a technical solution: A vehicle steering motor assembly is manufactured and assembled on a processing line 8. The vehicle steering motor assembly includes a housing 1. One side of the housing 1 is installed with the front cover 2 by fastening screws 12 to ensure a stable sealing connection between the front cover 2 and the housing 1. A claw 7 is provided on one side of the front cover 2. The claw 7 serves as a torque transmission interface of the motor assembly. An O-ring 21 is provided on the inner side of the front cover 2 to improve the sealing of the connection between the front cover 2 and the housing 1. A rotor assembly 5 is provided on one side of the claw 7. The inner cavity of the housing 1 is also provided with a stator assembly 9. The stator assembly 9 generates a rotating magnetic field after power is turned on and interacts with the rotor assembly 5 to drive the rotor assembly 5 to rotate continuously. A locking device 22 is also provided on the inner side of the front end cover 2, and the locking device 22 includes a double locking mechanism. The first locking mechanism is an elastic ring 221, and the second locking mechanism is arranged on the inner side of the elastic ring 221 and includes a lower locking ring 222 and an upper locking ring 223. The lower locking ring 222 and the upper locking ring 223 provide a fastening force to the connection between the front end cover 2 and the casing 1. The inner cavity of the lower locking ring 222 is provided with two mutually meshing gears 2222. By controlling the rotation of one of the gears 2222, the distance between the lower locking ring 222 and the upper locking ring 223 can be adjusted to achieve precise adjustment of the gap between the casing 1 and the front end cover 2.

[0020] In this embodiment, please refer to Figure 5 , Figure 8 , Fig. 9 , Fig.10 The locking cam 2231 is provided with a plurality of springs 226a and 226b, respectively, which are provided at two ends of the inner cavity of the lower locking ring 222. The flexible rack 2221 meshes with the gear 2222. A linkage groove 2231 is provided in the inner cavity of the upper locking ring 223. One end of the flexible rack 2221 is located in the inner cavity of the linkage groove 2231. A blocking block 2232 is provided in the linkage groove 2231. The blocking block 2232 and the tooth grooves of the flexible rack 2221 are arranged in opposite directions. In this embodiment, the gear 2222 is controlled to rotate so that one end of the two flexible racks 2221 is close to each other. Since the tooth grooves of the blocking block 2232 and the flexible rack 2221 are arranged in opposite directions, the flexible rack 2221 cannot move downward along the linkage groove 2231. As a result, the upper locking ring 223 moves downward under the action of the pulling force, and the distance between the upper locking ring 223 and the lower locking ring 222 becomes smaller, thereby locking the connecting end of the casing 1 and the front end cover 2.

[0021] In this embodiment, please refer to Figure 8 When the locking device 22 is subjected to external force, the spring will deform and store energy. When the external force disappears, the spring will release energy and push the elastic ring 221 to move in the direction of the casing 1, so that the lower locking ring 222 and the upper locking ring 223 are continuously clamped, thereby providing a continuous locking force to prevent the connection between the casing 1 and the front cover 2 from being loosened due to vibration when the motor rotor rotates. On the contrary, it will make the connection between the casing 1 and the front cover 2 more stable. When disassembling, the unlocking shaft 2233 is rotated in the direction of the blocking block 2232, and the gear 2222 casing is rotated in the reverse direction to release the lock of the lower locking ring 222 and the upper locking ring 223, so as to complete the disassembly.

[0022] In this embodiment, please refer to Figure 3-Figure 4, the other side of the housing 1 is set as an ECU mounting surface 14, and the surface of the ECU mounting surface 14 is provided with a magnetic support 11. The ECU mounting surface 14 is used to receive signals from the torque sensor and the vehicle speed sensor, and the magnetic support 11 is used to capture the angle change during the rotation process. In this embodiment, the ECU is installed at the ECU mounting surface 14 to receive signals from the torque sensor and the vehicle speed sensor, and the signals are processed by the built-in algorithm. According to the current vehicle speed and the torque input of the driver, the ECU calculates the required power assist and the direction of motor rotation. The ECU sends a control signal to the brushless DC motor through the drive circuit to adjust the current, voltage and phase of the motor to achieve accurate torque output. The motor runs according to the control signal, and the speed is reduced and the torque is increased through the deceleration mechanism and then transmitted to the steering mechanism. The power assist torque provided by the motor is superimposed on the input torque of the driver to jointly drive the steering mechanism to achieve power steering. The power assist varies with the vehicle speed, with large power assist at low speed and small power assist at high speed to ensure driving comfort and safety.

[0023] In this embodiment, please refer to Figure 3 A rear bearing 4 and a front bearing 6 are respectively arranged at both ends of the rotor assembly 5 inside the casing 1, and the rear bearing 4 and the front bearing 6 are used to support and guide the rotation of the rotor assembly 5. A wave spring washer 3 is also arranged at the connection between the rear bearing 4 and the casing 1, and the wave spring washer 3 is set to a wave structure. In this embodiment, the rear bearing 4 and the front bearing 6 both adopt high-precision deep groove ball bearings, which significantly reduce mechanical loss and vibration noise. At the same time, the wave structure of the wave spring washer 3 effectively absorbs the impact and vibration caused by the change of axial load, protects the rear bearing 4, the front bearing 6 and other precision components from damage, and extends the service life of the motor assembly.

[0024] A method for manufacturing a steering motor assembly for a vehicle comprises the following steps: Figure 1-Figure 7 , S1: placing the housing 1 and the stator assembly 9 at the starting positions of the assembly line 81 respectively, and using the laser engraving device 82 to precisely engrave and mark the housing 1 for easy tracking and management, and using the heating device 83 to heat the housing 1 for smooth insertion of the stator assembly 9; S2: insert the stator assembly 9 into the heated housing 1 through the first assembly device 84, and check the insertion position through the laser inspection machine 85 to ensure that the assembly position is accurate. If it fails, it will be removed from the production line; S3: The housing 1 is cooled by a cooling furnace 86 to prepare for the subsequent process, and the stator assembly 9 is firmly fixed in the housing 1 by a first riveting device 87, and a secondary positioning is performed; S4: Use the cleaning device 89 to insert the inner hole of the stator assembly 9 with a through gauge to ensure that the size requirements of the stator assembly 9 are met, ensure that the rotor assembly 5 can be inserted normally, and use the through gauge of the cleaning device 89 to clean the dust and impurities in the casing 1 to meet the motor cleanliness requirements. Use the AOI scanner 88 to perform image inspection on the casing 1 to ensure the assembly quality, and use the delivery device 810 to put the wave spring washer 3 into the connection position between the stator assembly 9 and the casing 1. Use the lubricating machine 811 to evenly apply lubricating oil to the installation positions of the rear bearing 4 and the front bearing 6 inside the casing 1 to reduce friction and wear and extend the service life of the bearings; S5: The front end cover 2 and the built-in front bearing 6 are loaded through the loading device 812, and the loading O-ring 21 is loaded into the connection between the front end cover 2 and the housing 1. The rotor assembly 5 is inserted into the wave spring washer 3 through the loading device 812, and the rear bearing 4 is pressed into the other end of the rotor assembly 5. Then, the rotor assembly 5 with the front end cover 2, the rear bearing 4 and the front bearing 6 is loaded into the housing 1, and the fastening screw 12 is screwed into the mounting hole 13 through the second riveting device 813, so that the housing 1 and the front end cover 2 are connected; S6: The claw 7 is pressed in by the pressing machine 814 and the coaxiality is checked by the coaxiality detection machine 818. At the same time, the magnetic support 11 is pressed in by the pressing machine 814 and the magnetic support 11 is pressed in and checked. The assembled assembly motor is tested for friction torque, back electromotive force, motor load vibration and abnormal sound by the detection chamber 815 to ensure that the motor assembly is qualified.

[0025] In this embodiment, please refer to Figure 1 , Figure 6 , the assembly process of the stator component 9 in S1 includes: laser coding the single-petal iron core 92 through the laser engraving equipment 82, then making the single-petal iron core 92 enter the winding stage, and firmly welding multiple single-petal iron cores 92 through the welding equipment 816 to form a complete stator skeleton, and then installing the busbar 91 at one end of the single-petal iron core 92. In this embodiment, the installation of the single-petal iron core 92 ensures the reliable connection between the stator component 9 and the external circuit, and the welding of the single-petal iron core 92 further enhances the structural strength of the entire component, providing a solid guarantee for the overall assembly of the motor.

[0026] In this embodiment, please refer to Figure 1 , Figure 7 The installation process of the rotor assembly 5 in S5 includes: laser coding the main iron core 51 through the laser engraving equipment 82, and preheating the main iron core 51 through the heating equipment 83, and then attaching the magnet 52 to the outside of the main iron core 51, and then standing it to solidify. In this embodiment, the preheating and static curing ensure the close combination of the main iron core 51 and the magnet 52.

[0027] In this embodiment, please refer to Figure 1, Figure 7 After the rotor assembly 5 is left to solidify, the performance parameters of the rotor assembly 5 are verified by testing the machine chamber 815, and the rotor assembly 5 is cleaned by the cleaning device 89. After passing the test, the rotor assembly 5 is installed in the housing 1. In this embodiment, the rotor assembly 5 is tested with magnetic flux to verify its performance parameters, and the cleaning device 89 is used to ensure the accurate size and cleanliness of the rotor assembly. After passing the test, the rotor shaft is accurately installed to enhance the rotational stability of the rotor.

[0028] Working principle of the present invention: Step 1: The housing 1 is accurately placed from the storage area to the starting position of the assembly line through the conveyor belt of the assembly line 81, ensuring that each housing 1 can enter the assembly process accurately. The laser engraving device 82 uses precision equipment such as laser engraving or mechanical engraving to engrave a unique identification code or serial number on the housing 1, ensuring the traceability of each housing 1, facilitating subsequent management, quality control and troubleshooting. After entering the assembly line, the housing 1 is heated by the heating device 83 to soften the housing 1 and reduce the assembly stress, thereby facilitating the smooth insertion of the stator assembly, and at the same time, it can also improve the connection between the housing 1 and the stator assembly 9. The fit between the two is ensured to ensure the tightness and stability of the assembly. After the casing 1 is heated, the stator assembly 9 is accurately inserted into the casing 1 by using the first assembly device 84 to ensure that the stator assembly 9 and the casing 1 are tightly fitted and accurately positioned. After the stator assembly 9 is inserted, the assembly position is accurately checked by the laser detection machine 85 to avoid quality problems caused by assembly errors. Subsequently, the casing 1 is cooled by the cooling furnace 86 to reduce its temperature to room temperature or close to room temperature, thereby improving the hardness and stability of the casing 1 and ensuring the long-term stable operation of the motor. After the stator assembly 9 is inserted into the casing 1 and cooled, The stator assembly 9 is firmly fixed in the housing 1 by the first riveting device 87, and then the stator assembly 9 is imaged and inspected by the AOI scanner 88 to accurately detect the assembly position, height and shape of the stator assembly 9, ensuring the accuracy and consistency of the assembly. Then, the inner hole of the stator assembly 9 is cleaned by the cleaning device 89 to remove impurities, oil stains and other pollutants inside the stator. The front end cover 2 and the rotor assembly 5 are automatically loaded and assembled on the housing 1 by the loading device 812, and the rotor assembly 5 is accurately inserted into the housing by the pressing machine 814 to ensure that the rotor assembly and the stator assembly are tightly matched. , the position is accurate, and then the rear bearing 4 is accurately pressed into the other end of the rotor assembly 5 by the pressing machine 814, ensuring that the rear bearing and the casing fit tightly and are reliably fixed. After the assembly is completed, the coaxiality of the motor is detected and calibrated by the coaxiality detection machine 818, and then the magnetic support 11 is pressed into the specified position inside the motor by the pressing machine 814, and the height is checked by the coaxiality detection machine 818. The assembled assembly motor is comprehensively tested for performance parameters such as friction torque, back electromotive force, and motor load vibration through the detection chamber 815, and finally the motor assembly is tested for abnormal sound by the abnormal sound testing machine 819.

[0029] Step 2, after the front end cover 2 and the casing 1 are assembled, the spiral connected to one side of the gear 2222 is rotated by the second riveting device 813. Since the two gears 2222 are meshed with each other, the two gears 2222 are driven to rotate in opposite directions at the same time. Since the two gears 2222 are respectively meshed with a flexible rack 2221, the flexible rack 2221 is driven to move. By controlling the two flexible racks 2221 to move closer to each other at the same time, since the flexible racks 2221 and the blocking block 2232 block each other, the upper locking ring 223 is driven to move downward, so that the distance between the upper locking ring 223 and the lower locking ring 222 is close to each other, thereby reducing the inner diameter of the locking device 22, and the lower locking ring 222 is used to close the lower locking ring 222. The joint between the housing 1 and the front cover 2 is locked, and because the blocking block 2232 and the flexible rack 2221 are in opposite directions, the flexible rack 2221 is prevented from moving upward, so that the inner diameter of the locking device 22 is fixed, and the bearing is prevented from vibrating during operation, which causes the inner diameter of the locking device 22 to expand and the connection between the housing 1 and the front cover 2 to loosen. At the same time, since the locking device 22 is provided with an elastic ring 221 and a spring inside, when the locking device 22 is subjected to an external force, the spring will deform and store energy. When the external force disappears, the spring will release energy and push the elastic ring 221 to move in the direction of the housing 1, so that the lower locking ring 222 and the upper locking ring 223 are continuously clamped, thereby providing a continuous locking force; Step 3: Place the busbar 91 at the designated position of the assembly line 81, and use the laser engraving device 82 to engrave the identification code or serial number, and use the CNC winding machine 817 to wind the wire around the busbar 91 according to the preset winding parameters to form a winding. Connect multiple busbars 91 together firmly through the welding device 816 to form a complete stator skeleton, and then install the single-lobe iron core 92 to the stator skeleton, and then weld the key parts of the stator skeleton again through the welding equipment to enhance the structural strength of the entire assembly. Use the detection equipment to measure the resistance, insulation resistance test, and withstand voltage test of the stator assembly 9 to verify the stator assembly 9. Performance and quality, the main iron core 51 is placed on the busbar 91, laser coding is performed, and then preheating treatment is performed through the heating equipment 83 to make the surface of the main iron core 51 reach an appropriate temperature, and the magnet 52 is attached to the main iron core 51 through the attaching equipment. After the attachment is completed, the rotor assembly 5 is left to stand for a period of time to allow the adhesive between the magnet and the iron core to fully solidify, and the size and shape of the rotor assembly is detected by the laser detection machine 85, and then the rotor assembly 5 is cured in the curing furnace. Finally, the rotor assembly 5 is dusted to ensure the cleanliness of the surface, and then the front cover 2 and the rotor assembly 5 are press-fitted to complete the assembly of the rotor assembly 5 and the casing 1.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A vehicle steering motor assembly, comprising a housing (1), one side of the housing (1) being mounted to a front cover (2) by means of a fastening screw (12) to ensure a stable sealing connection between the front cover (2) and the housing (1), characterized in that: A claw (7) is provided on one side of the front end cover (2), and the claw (7) serves as a torque transmission interface of the motor assembly. An O-ring (21) is provided on the inner side of the front end cover (2) for improving the sealing performance of the connection between the front end cover (2) and the housing (1); A rotor assembly (5) is disposed on one side of the claw (7), and a stator assembly (9) is also disposed in the inner cavity of the housing (1); the stator assembly (9) generates a rotating magnetic field after power is supplied and interacts with the rotor assembly (5), thereby driving the rotor assembly (5) to rotate continuously; A locking device (22) is also provided on the inner side of the front end cover (2), and the locking device (22) includes a double locking mechanism; The first locking mechanism is an elastic ring (221), and the second locking mechanism is arranged on the inner side of the elastic ring (221) and comprises a lower locking ring (222) and an upper locking ring (223). The lower locking ring (222) and the upper locking ring (223) provide a fastening force to the connection between the front end cover (2) and the housing (1). The inner cavity of the lower locking ring (222) is provided with two mutually meshing gears (2222). By controlling the rotation of one of the gears (2222), the spacing between the lower locking ring (222) and the upper locking ring (223) can be adjusted, thereby realizing accurate adjustment of the gap between the housing (1) and the front end cover (2).

2. The vehicle steering motor assembly according to claim 1, characterized in that: A flexible rack (2221) is respectively provided at both ends of the inner cavity of the lower locking ring (222), and the flexible rack (2221) and the gear (2222) are meshed with each other. A linkage groove (2231) is provided in the inner cavity of the upper locking ring (223), and one end of the flexible rack (2221) is located in the inner cavity of the linkage groove (2231). A blocking block (2232) is provided in the linkage groove (2231), and the blocking block (2232) and the tooth groove of the flexible rack (2221) are arranged in opposite directions.

3. The vehicle steering motor assembly according to claim 2, characterized in that: An elastic ring (221) is further provided on the inner side of the locking device (22), and a plurality of springs are provided on the outer side of the elastic ring (221). An unlocking shaft (2233) is fixedly connected to one end of the blocking block (2232), and one side of the unlocking shaft (2233) protrudes from the surface of the front end cover (2).

4. The vehicle steering motor assembly according to claim 1, characterized in that: The other side of the housing (1) is provided as an ECU mounting surface (14), a surface of the ECU mounting surface (14) is provided with a magnetic support (11), the ECU mounting surface (14) is used to receive signals from a torque sensor and a vehicle speed sensor, and the magnetic support (11) is used to capture angle changes during rotation.

5. The vehicle steering motor assembly according to claim 1, characterized in that: A rear bearing (4) and a front bearing (6) are respectively arranged at both ends of the rotor assembly (5) inside the casing (1), and the rear bearing (4) and the front bearing (6) are used to support and guide the rotor assembly (5) to rotate. A wave spring washer (3) is also arranged at the connection between the rear bearing (4) and the casing (1), and the wave spring washer (3) is arranged to have a wave structure.

6. A method for manufacturing a steering motor assembly for a vehicle, characterized in that: The following steps are involved: S1: placing the housing (1) and the stator assembly (9) at the starting positions of the assembly line (81) respectively, using a laser engraving device (82) to precisely engrave a mark on the housing (1) for easy tracking and management, and using a heating device (83) to heat the housing (1) for easy insertion of the stator assembly (9); S2: inserting the stator assembly (9) into the heated housing (1) through the first assembly device (84), and checking the insertion position through the laser inspection machine (85) to ensure that the assembly position is accurate. If it fails, it is removed from the production line; S3: cooling the housing (1) by means of a cooling furnace (86) to prepare for subsequent processes, firmly fixing the stator assembly (9) in the housing (1) by means of a first riveting device (87), and performing secondary positioning; S4: inserting a through gauge into the inner hole of the stator assembly (9) through the cleaning device (89) to ensure that the size requirements of the stator assembly (9) are met and that the rotor assembly (5) can be normally inserted, and the dust and impurities in the housing (1) are cleaned by the through gauge of the cleaning device (89) to meet the cleanliness requirements of the motor. The housing (1) is image-checked by the AOI scanner (88) to ensure the assembly quality, and the wave spring washer (3) is inserted into the connection position between the stator assembly (9) and the housing (1) through the insertion device (810). The lubricating oil is evenly applied to the installation positions of the rear bearing (4) and the front bearing (6) inside the housing (1) through the lubricating machine (811) to reduce friction and wear and extend the service life of the bearings; S5: The front end cover (2) and the built-in front bearing (6) are loaded by the loading device (812), and the O-ring (21) is loaded into the connection between the front end cover (2) and the housing (1). The rotor assembly (5) is inserted into the wave spring washer (3) by the loading device (812), and the rear bearing (4) is pressed into the other end of the rotor assembly (5). The rotor assembly (5) with the front end cover (2), the rear bearing (4), and the front bearing (6) is then loaded into the housing (1). The fastening screw (12) is screwed into the mounting hole (13) by the second riveting device (813), so that the housing (1) and the front end cover (2) are connected; S6: The clamping claw (7) is pressed in by a pressing machine (814) and the coaxiality is checked by a coaxiality inspection machine (818). At the same time, the magnetic support (11) is pressed in by a pressing machine (814) and the magnetic support (11) is pressed in and checked. The assembled motor assembly is tested for friction torque, back electromotive force, motor load vibration and abnormal sound by an inspection chamber (815) to ensure that the motor assembly is qualified.

7. The method for manufacturing a vehicle steering motor assembly according to claim 6, characterized in that: The assembly process of the stator assembly (9) in S1 includes: laser coding the single-lobe iron core (92) by means of a laser engraving device (82), then allowing the single-lobe iron core (92) to enter a winding stage, and firmly welding a plurality of single-lobe iron cores (92) by means of a welding device (816) to form a complete stator frame, and then installing a busbar (91) at one end of the single-lobe iron core (92).

8. The method for manufacturing a vehicle steering motor assembly according to claim 6, characterized in that: The installation process of the rotor assembly (5) in S5 includes: laser coding the main iron core (51) by means of a laser engraving device (82), preheating the main iron core (51) by means of a heating device (83), and then attaching the magnet (52) to the outer side of the main iron core (51), and then allowing it to stand and solidify.

9. The method for manufacturing a vehicle steering motor assembly according to claim 8, characterized in that: After the rotor assembly (5) is left to solidify, the performance parameters of the rotor assembly (5) are verified by testing the machine chamber (815), and the rotor assembly (5) is cleaned by a cleaning device (89). After passing the test, the rotor assembly (5) is installed in the housing (1).

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