Fatigue test device for automobile electric power steering system assembly

Abstract

The invention relates to a fatigue test device for an automobile electric power steering system assembly, and belongs to the technical field of new energy automobile accessory testing, the fatigue test device comprises a test machine body and an automobile electric power steering gear device arranged outside the test machine body, the test machine body comprises a base, a vertical plate, a hydraulic cylinder, a moving plate and a steering fatigue test machine, a knocking structure for periodically knocking the automobile electric power steering gear device is arranged outside the moving plate, the automobile electric power steering gear device comprises an automobile electric power steering gear body and a steering wheel, and an inclination structure for performing inclination adjustment on the steering fatigue testing machine is arranged at the top of the base. The fatigue test device for the automobile electric power steering system assembly has the advantages of being high in test accuracy and the like, synchronous simulation of steering, knocking and inclination is achieved, complex dynamic loads in actual driving are effectively restored, and the test accuracy, comprehensiveness and reliability are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy automobile accessory testing technology, in particular to a fatigue test device for automobile electric power steering system assembly. BACKGROUND

[0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as power sources and integrate advanced technologies in vehicle power control and driving to form vehicles with advanced technical principles and new technologies and structures.

[0003] With the wide application of automobile electric power steering systems, the reliability and durability requirements thereof are increasingly improved. At present, the traditional fatigue test device for automobile electric power steering systems mainly uses a motor to drive a gear pair to simulate the forward and reverse rotation of a steering wheel, and a controller is used to control the periodic commutation of the motor to simulate the basic working condition of the driver operating the steering wheel. However, in the actual driving process, the steering system is not only subjected to the periodic torque input by the steering wheel, but also subjected to complex dynamic loads caused by factors such as road unevenness, vehicle acceleration and deceleration, and tire impact. This simulation method cannot truly reflect the complex dynamic loads borne by the steering system in actual use, resulting in a certain gap between the test results and the actual use, and it is difficult to accurately evaluate the fatigue life and reliability of the electric power steering system.

[0004] Therefore, it is urgent to improve the fatigue test device for automobile electric power steering system assembly to solve the above problems. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a fatigue test device for automobile electric power steering system assembly, which has the advantages of high testing accuracy, realizes synchronous simulation of steering, knocking and tilting, effectively restores the complex dynamic loads in actual driving, and significantly improves the testing accuracy, comprehensiveness and reliability.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a fatigue test device for automobile electric power steering system assembly, comprising a test machine body and an automobile electric power steering device arranged outside the test machine body, the test machine body comprising a base, a vertical plate, a hydraulic cylinder, a moving plate and a steering fatigue test machine, the moving plate being provided with a knocking structure outside for periodically knocking the automobile electric power steering device, the automobile electric power steering device comprising an automobile electric power steering body and a steering wheel, the top of the base being provided with a tilting structure for adjusting the inclination of the steering fatigue test machine, the base and the moving plate being provided with adjusting structures and driving mechanisms outside respectively linked with the knocking structure and the tilting structure; The knocking structure comprises a connecting frame fixedly connected to the bottom of the moving plate, a first fixed block fixedly connected to the bottom of the connecting frame, a second fixed block arranged outside the first fixed block, a limiting rod arranged between the first fixed block and the second fixed block, a mounting seat fixedly connected to the outside of the second fixed block, a connecting shaft fixedly connected to the inside of the mounting seat and extending to the outside thereof, a connecting plate fixedly connected to one end of the connecting shaft, a knocking block arranged on one side of the connecting plate and abutting against the outer wall of the body of the automobile electric power steering gear, an abutting spring fixedly connected between the knocking block and the connecting plate, and a transmission structure arranged on the other side of the mounting seat. The inclination structure comprises a support plate fixedly connected to the top of the base and a mounting plate arranged on the top of the support plate, elastic telescopic rods hingedly connected between the support plate and the mounting plate, an abutting plate fixedly connected to one side of the mounting plate, and the steering fatigue testing machine fixedly mounted on the top of the mounting plate.

[0007] Further, a first connecting block is fixedly connected to the back of the first fixed block, a second connecting block is fixedly connected to the back of the second fixed block, and the limiting rod is fixedly connected to the inside of the first connecting block.

[0008] Further, the transmission structure comprises a mounting block fixedly connected to the other end of the connecting shaft and a rotating shaft rotatably connected to the inside of the first fixed block and the first connecting block and extending to the outside thereof, a roller rotatably connected to the inside of the mounting block, an eccentric block fixedly connected to one end of the rotating shaft and rollingly connected to the outside of the roller, and the knocking block reciprocally and slidably connected to the lower surface of the moving plate through the eccentric block.

[0009] Further, a reset structure is arranged between the first fixed block and the second fixed block, and the reset structure comprises guide blocks fixedly connected to the outside of the first fixed block and the second fixed block respectively, and a tension spring fixedly connected between the two guide blocks.

[0010] Further, the number of the elastic telescopic rods is four, and the four elastic telescopic rods are sequentially distributed in a rectangular shape between the support plate and the mounting plate, and a hinged seat is rotatably connected to the middle part of the support plate and the mounting plate.

[0011] Further, the adjusting structure comprises a mounting frame fixedly connected to the top of the base, a limiting sleeve fixedly connected to the inside of the mounting frame, a moving rod slidably connected to the inside of the limiting sleeve and extending to the outside thereof, a transmission disc fixedly connected to the top end of the moving rod and abutting against the lower surface of the eccentric block, a reset spring fixedly connected between the limiting sleeve and the transmission disc, and the reset spring being annularly connected to the outside of the moving rod.

[0012] Further, the inside of the moving rod is slidably connected with an extension rod extending to the lower surface thereof and abutting against the top of the abutting plate, and the outside of the moving rod is rotatably connected with an adjusting knob extending to the outside thereof and abutting against the outer surface of the extension rod, and the inner top wall of the mounting frame is further fixedly connected with a guide shaft, and the moving rod is slidably connected to the outside of the guide shaft through the connecting lug.

[0013] Further, the driving mechanism comprises a transmission mechanism and a synchronous structure, the transmission mechanism comprises a rotating seat rotatably connected to the inside of the moving plate and a forward-reverse motor fixedly installed on the top of the moving plate, the outside of the rotating seat is fixedly installed with a worm gear, one end of the output shaft of the forward-reverse motor is fixedly connected with a worm rod engaged with the worm gear, and the inner wall of the rotating seat is fixedly installed with two micro electric push rods oppositely arranged, the output shaft of the micro electric push rod is fixedly connected with a clamping plate, and the inner side of the clamping plate abuts against the outer wall of the automobile electric power steering device body.

[0014] Further, the synchronous structure comprises a transmission wheel fixedly installed on the other end of the output shaft of the forward-reverse motor and a driven wheel fixedly connected to the end of the rotating shaft away from the eccentric block, and the outside of the transmission wheel and the driven wheel is drivingly connected with a belt.

[0015] Further, the vertical plate is fixedly connected to the top of the base, the hydraulic cylinder is fixedly installed on the top of the vertical plate and extends to the lower surface thereof, the moving plate is fixedly installed on the output end of the hydraulic cylinder, the output end of the automobile electric power steering device body is connected with the steering fatigue testing machine, and the steering wheel is detachably connected to the top end of the automobile electric power steering device body.

[0016] Compared with the prior art, the automobile electric power steering system assembly fatigue test device has the following beneficial effects: 1. The automobile electric power steering system assembly fatigue test device drives the mounting block and the roller to reciprocate through the transmission structure, so that the connecting plate drives the knocking block to periodically knock the automobile electric power steering device body, simulates the complex dynamic load caused by factors such as uneven road surface and tire impact in actual driving, more truly reflects the stress condition of the steering system in actual use, and improves the accuracy of test results.

[0017] 2. The automobile electric power steering system assembly fatigue test device is provided with the elastic extension rod, so that the mounting plate can be inclined at a certain angle relative to the supporting plate, simulates the dynamic load borne by the steering system under vehicle acceleration and deceleration and the like working conditions, the position of the extension rod can be adjusted through the adjusting knob, the moving rod drives the moving rod to move up and down, the inclination angle of the inclined structure can be adjusted, the simulation of complex dynamic load under different working conditions is realized, and the universality of the test device and the comprehensiveness of the test are improved.

[0018] 2、The automobile electric power assisted steering system assembly fatigue test device, through the positive and negative rotation motor is driven by the worm and the worm gear, the rotation seat is rotated, the micro electric push rod pushes the clamping plate clamping the automobile electric power assisted steering ware body, makes the automobile electric power assisted steering ware body with the rotation seat rotation, simulates the positive and negative rotation movement of the steering wheel, and cooperates with the knocking structure and the inclination structure, guarantees the synchronization of the knocking action and the rotation action of the automobile electric power assisted steering ware body, makes the test working condition more in line with the stress synchronization of the steering system in actual driving, improves the accuracy and reliability of test. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is whole structure schematic diagram of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 2 It is structure schematic diagram of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 3 It is connection structure schematic diagram of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 4 It is structure schematic diagram of the knocking structure of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 5 It is reset structure structure schematic diagram of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 6 It is structure schematic diagram of the knocking block and the gyro wheel of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 7 It is inclination structure and adjusting structure connection structure schematic diagram of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 8 It is structure schematic diagram of the driving mechanism and the knocking structure of the automobile electric power assisted steering system assembly fatigue test device of the application; Figure 9 It is structure schematic diagram of the rotation seat, micro electric push rod and clamping plate of the automobile electric power assisted steering system assembly fatigue test device of the application.

[0020] In the diagram: 1. Test machine body; 11. Base; 12. Vertical plate; 13. Hydraulic cylinder; 14. Moving plate; 15. Steering fatigue testing machine; 2. Automotive electric power steering device; 21. Automotive electric power steering body; 22. Steering wheel; 3. Impact structure; 31. Connecting frame; 32. First fixing block; 33. Second fixing block; 34. First connecting block; 35. Second connecting block; 36. Limiting rod; 37. Mounting seat; 38. Connecting shaft; 39. Connecting plate; 310. Abutment spring; 311. Impact block; 312. Mounting block; 313. Roller; 314. Rotary... 315. Moving shaft; 316. Eccentric block; 317. Guide block; 318. Tension spring; 4. Inclined structure; 41. Support plate; 42. Mounting plate; 43. Elastic telescopic rod; 44. Abutment plate; 5. Adjustment structure; 51. Mounting bracket; 52. Limit sleeve; 53. Moving rod; 54. Transmission disc; 55. Return spring; 56. Pressure rod; 57. Guide shaft; 58. Adjustment knob; 6. Drive mechanism; 61. Rotating seat; 62. Worm gear; 63. Forward and reverse motor; 64. Worm; 65. Transmission wheel; 66. Driven wheel; 67. Belt; 68. Miniature electric push rod; 69. Clamping plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 9 This embodiment of an electric power steering system assembly fatigue testing device includes a testing machine body 1 and an electric power steering device 2 disposed outside the testing machine body 1. The testing machine body 1 includes a base 11, a vertical plate 12, a hydraulic cylinder 13, a moving plate 14, and a steering fatigue testing machine 15. The moving plate 14 is provided with a striking structure 3 for periodically striking the electric power steering device 2. The electric power steering device 2 includes an electric power steering body 21 and a steering wheel 22. The top of the base 11 is provided with an tilting structure 4 for tilting the steering fatigue testing machine 15. The base 11 and the moving plate 14 are provided with an adjustment structure 5 and a drive mechanism 6 that are respectively linked to the striking structure 3 and the tilting structure 4.

[0023] The upright plate 12 is fixedly connected to the top of the base 11, the hydraulic cylinder 13 is fixedly installed on the top of the upright plate 12 and extends to its lower surface, the movable plate 14 is fixedly installed on the output end of the hydraulic cylinder 13, the output end of the electric power steering body 21 is connected to the steering fatigue testing machine 15, and the steering wheel 22 is detachably connected to the top of the electric power steering body 21.

[0024] It should be noted that the hydraulic cylinder 13 can drive the moving plate 14 to move up and down, providing a suitable installation position and motion basis for the subsequent work of components such as the striking structure 3, facilitating the simulation of testing the electric power steering device 2 under different working conditions. The detachable steering wheel 22 facilitates installation and replacement. The electric power steering body 21 is connected to the steering fatigue testing machine 15, facilitating fatigue testing of the electric power steering body 21 and simulating the working state of the electric power steering body 21 in actual use.

[0025] Please see Figures 1 to 6 In this embodiment, the striking structure 3 includes a connecting frame 31 fixedly connected to the bottom of the movable plate 14. A first fixing block 32 is fixedly connected to the bottom of the connecting frame 31. A second fixing block 33 is provided outside the first fixing block 32. A limit rod 36 is provided between the first fixing block 32 and the second fixing block 33. A mounting base 37 is fixedly connected to the outside of the second fixing block 33. A connecting shaft 38 extending to the outside of the mounting base 37 is fixedly connected inside the mounting base 37. A connecting plate 39 is fixedly connected to one end of the connecting shaft 38. A striking block 311 that abuts against the outer wall of the electric power steering body 21 of the vehicle is provided on one side of the connecting plate 39. An abutment spring 310 is fixedly connected between the striking block 311 and the connecting plate 39. A transmission structure is provided on the other side of the mounting base 37.

[0026] The first fixing block 32 is fixedly connected to the back of the first connecting block 34, and the second fixing block 33 is fixedly connected to the back of the second connecting block 35. The limiting rod 36 is fixedly connected to the inside of the first connecting block 34, and the second connecting block 35 is slidably connected to the outside of the limiting rod 36. By setting the limiting rod 36, the second fixing block 33 can only slide in the direction of the limiting rod 36, ensuring the stability of the movement of the striking structure 3, and enabling the striking block 311 to accurately strike the body 21 of the electric power steering system.

[0027] Specifically, the transmission structure includes a mounting block 312 fixedly connected to the other end of the connecting shaft 38 and a rotating shaft 314 rotatably connected to the inside of the first fixed block 32 and the first connecting block 34 and extending to their outside. A roller 313 is rotatably connected inside the mounting block 312, and an eccentric block 315 is fixedly connected to one end of the rotating shaft 314 and is rolledly connected to the outside of the roller 313. The striking block 311 is reciprocally slidably connected to the lower surface of the moving plate 14 through the eccentric block 315. The transmission structure drives the mounting block 312 and the roller 313 to swing back and forth, thereby causing the connecting plate 39 to drive the striking block 311 to periodically strike the electric power steering body 21 of the car. This simulates the complex dynamic load caused by factors such as uneven road surface and tire impact during actual driving, more realistically reflecting the force situation of the steering system in actual use and improving the accuracy of the test results.

[0028] It should be noted that a reset structure is provided between the first fixing block 32 and the second fixing block 33. The reset structure includes guide blocks 316 fixedly connected to the outside of the first fixing block 32 and the second fixing block 33, respectively, and a tension spring 317 fixedly connected between the two guide blocks 316. After the striking block 311 completes the striking action, the tension spring 317 can cause the second fixing block 33 to drive the mounting base 37 and other components to quickly reset, preparing for the next striking action and ensuring the periodicity and stability of the striking action.

[0029] Please see Figures 1 to 3 and Figure 7 In this embodiment, the inclined structure 4 includes a support plate 41 fixedly connected to the top of the base 11 and a mounting plate 42 disposed on the top of the support plate 41. An elastic telescopic rod 43 is hinged between the support plate 41 and the mounting plate 42. An abutment plate 44 is fixedly connected to one side of the mounting plate 42. The steering fatigue testing machine 15 is fixedly installed on the top of the mounting plate 42.

[0030] The test includes four elastic telescopic rods 43, arranged in a rectangular shape between the support plate 41 and the mounting plate 42. A hinged joint connects the middle of the support plate 41 and the mounting plate 42. The design of the elastic telescopic rods 43 and the hinged joint allows the mounting plate 42 to tilt relative to the support plate 41 at a certain angle, simulating the dynamic loads on the steering system under vehicle acceleration and deceleration conditions. This enriches the test conditions and makes the test closer to actual conditions. The rectangular distribution of the four elastic telescopic rods 43 ensures even weight distribution on the mounting plate 42 and the steering fatigue testing machine 15, while maintaining the stability of the mounting plate 42 when tilted. This allows the tilting structure 4 to more accurately simulate the stress on the steering system under vehicle acceleration and deceleration conditions.

[0031] Please see Figures 1 to 3 and Figure 7In this embodiment, the adjustment structure 5 includes a mounting bracket 51 fixedly connected to the top of the base 11. A limiting sleeve 52 is fixedly connected inside the mounting bracket 51. A moving rod 53 extending to the outside of the limiting sleeve 52 is slidably connected inside the limiting sleeve 52. A transmission disc 54 abutting against the lower surface of the eccentric block 315 is fixedly connected to the top of the moving rod 53. A return spring 55 is fixedly connected between the limiting sleeve 52 and the transmission disc 54, and the return spring 55 is connected around the outside of the moving rod 53. The position of the pressure rod 56 can be adjusted by adjusting the knob 58, thereby causing the transmission disc 54 to drive the moving rod 53 to move up and down, changing the contact position with the abutment plate 44. The tilt angle of the tilting structure 4 can be adjusted to simulate complex dynamic loads under different working conditions, improving the versatility of the test device and the comprehensiveness of the test.

[0032] The movable rod 53 has a sliding connection inside to a pressure rod 56 that extends to its lower surface and abuts against the top of the abutment plate 44. The movable rod 53 has a rotatable connection outside to an adjustment knob 58 that extends to its outside and abuts against the outer surface of the pressure rod 56. A guide shaft 57 is also fixedly connected to the inner top wall of the mounting bracket 51. The movable rod 53 is slidably connected to the outside of the guide shaft 57 through a connecting lug.

[0033] Please see Figures 1 to 3 , Figure 8 as well as Figure 9 In this embodiment, the drive mechanism 6 includes a transmission mechanism and a synchronization structure. The transmission mechanism includes a rotating seat 61 rotatably connected inside the moving plate 14 and a forward and reverse motor 63 fixedly installed on the top of the moving plate 14. A worm gear 62 is fixedly installed on the outside of the rotating seat 61. A worm 64 that meshes with the worm gear 62 is fixedly connected to one end of the output shaft of the forward and reverse motor 63. Two miniature electric push rods 68 arranged opposite to each other are fixedly installed on the inner wall of the rotating seat 61. A clamping plate 69 is fixedly connected to the output shaft of the miniature electric push rod 68. The inner side of the clamping plate 69 abuts against the outer wall of the electric power steering body 21 of the car. The rotating seat 61 is driven to rotate by the worm gear 64 and worm wheel 62 via the forward and reverse motor 63. The micro electric push rod 68 pushes the clamping plate 69 to clamp the electric power steering body 21 of the car, so that the electric power steering body 21 of the car rotates with the rotating seat 61, simulating the forward and reverse movement of the steering wheel 22. At the same time, in conjunction with the striking structure 3 and the tilting structure 4, it more comprehensively simulates the force situation of the steering system in actual use.

[0034] The synchronization structure includes a transmission wheel 65 fixedly mounted on the output shaft of the other end of the forward and reverse motor 63 and a driven wheel 66 fixedly connected to the end of the rotating shaft 314 away from the eccentric block 315. The transmission wheel 65 and the driven wheel 66 are externally connected by a belt 67.

[0035] The working principle of the above embodiments is as follows: When using this test device, first install the electric power steering body 21 of the car into the rotating seat 61. Then, the miniature electric push rod 68 is activated, pushing the clamping plate 69 to approach and clamp the electric power steering body 21 of the car, thereby completing the initial fixation of the electric power steering body 21 of the car. Then, the hydraulic cylinder 13 starts to work, precisely adjusting the height of the moving plate 14 so that the lower end of the electric power steering body 21 of the car is accurately connected to the steering fatigue testing machine 15, achieving a stable fixation and preparing for subsequent tests. The forward and reverse motor 63 starts to drive the worm 64 to rotate. Since the worm 64 and the worm wheel 62 mesh with each other, the worm wheel 62 will rotate accordingly, thereby driving the rotating seat 61 and the electric power steering body 21 installed in the rotating seat 61 to perform periodic forward and reverse movements. This action simulates the steering action of the driver when actually operating the steering wheel 22, providing a basic steering input load for the test, so as to verify the performance of the electric power steering body 21 under normal steering operation. While the forward and reverse motor 63 drives the worm gear 64 to rotate the worm wheel 62, the forward and reverse motor 63 also transmits power to the driven wheel 66 through the transmission wheel 65 and the belt 67, causing the driven wheel 66 to rotate. The driven wheel 66 drives the rotating shaft 314 to rotate, which in turn causes the eccentric block 315 mounted on the rotating shaft 314 to rotate. During the rotation, the eccentric block 315 rolls in contact with the roller 313. Due to the eccentric characteristics of the eccentric block 315, a periodic thrust is generated, which pushes the mounting block 312 to swing back and forth. The mounting block 312 drives the connecting plate 39 and the striking block 311 to periodically strike the outer wall of the electric power steering body 21 of the car in a radial manner. This striking action simulates the impact load generated when the tire contacts the road surface, effectively filling the gap that traditional test devices cannot simulate radial dynamic forces, and enabling the test to more comprehensively detect the ability of the electric power steering body 21 of the car to withstand radial impact. During the radial impact of the striking block 311 on the electric power steering body 21 of the car, the eccentric block 315 rotates and presses down the transmission plate 54. The transmission plate 54 drives the moving rod 53 to move downward. When the moving rod 53 moves downward, it pushes the pressure rod 56. The pressure rod 56 acts on the abutment plate 44, causing the mounting plate 42 to tilt around the hinge seat. The four elastic telescopic rods 43 provide support and reset force for the tilting action of the mounting plate 42, ensuring that the tilting action is stable and controllable. This process simulates the attitude changes of the vehicle when accelerating and decelerating and driving on uneven road sections, further enriching the test conditions. Through the series of simulations described above, the test device can more realistically simulate the various loads that the steering system experiences during actual driving, including basic steering input load, radial impact load, and complex loads caused by changes in vehicle attitude. This comprehensive simulation method can more accurately detect the performance changes and potential problems of the electric power steering system under different operating conditions, thereby significantly improving the accuracy of reliability assessment of the electric power steering system. This helps automakers improve product quality and safety, and provide consumers with more reliable automotive products.

[0036] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fatigue testing device for an automotive electric power steering system assembly, characterized in that: The test machine includes a test body (1) and an electric power steering device (2) disposed outside the test body (1). The test body (1) includes a base (11), a vertical plate (12), a hydraulic cylinder (13), a moving plate (14), and a steering fatigue testing machine (15). The moving plate (14) is provided with a striking structure (3) for periodically striking the electric power steering device (2). The electric power steering device (2) includes an electric power steering body (21) and a steering wheel (22). The top of the base (11) is provided with a tilting structure (4) for tilting the steering fatigue testing machine (15). The base (11) and the moving plate (14) are provided with an adjustment structure (5) and a drive mechanism (6) respectively linked to the striking structure (3) and the tilting structure (4). The striking structure (3) includes a connecting frame (31) fixedly connected to the bottom of the movable plate (14). A first fixing block (32) is fixedly connected to the bottom of the connecting frame (31). A second fixing block (33) is provided outside the first fixing block (32). A limit rod (36) is provided between the first fixing block (32) and the second fixing block (33). A mounting base (37) is fixedly connected to the outside of the second fixing block (33). A connecting shaft (38) extending to the outside of the mounting base (37) is fixedly connected inside the mounting base (37). A connecting plate (39) is fixedly connected to one end of the connecting shaft (38). A striking block (311) is provided on one side of the connecting plate (39) and abuts against the outer wall of the electric power steering body (21). A stop spring (310) is fixedly connected between the striking block (311) and the connecting plate (39). A transmission structure is provided on the other side of the mounting base (37). The inclined structure (4) includes a support plate (41) fixedly connected to the top of the base (11) and an mounting plate (42) set on the top of the support plate (41). An elastic telescopic rod (43) is hinged between the support plate (41) and the mounting plate (42). An abutment plate (44) is fixedly connected to one side of the mounting plate (42). The steering fatigue testing machine (15) is fixedly installed on the top of the mounting plate (42).

2. The fatigue testing device for an automotive electric power steering system assembly according to claim 1, characterized in that: The back of the first fixing block (32) is fixedly connected to the first connecting block (34), the back of the second fixing block (33) is fixedly connected to the second connecting block (35), the limiting rod (36) is fixedly connected to the inside of the first connecting block (34), and the second connecting block (35) is slidably connected to the outside of the limiting rod (36).

3. The fatigue testing device for an automotive electric power steering system assembly according to claim 1, characterized in that: The transmission structure includes a mounting block (312) fixedly connected to the other end of the connecting shaft (38) and a rotating shaft (314) rotatably connected to the inside of the first fixed block (32) and the first connecting block (34) and extending to the outside of them. A roller (313) is rotatably connected inside the mounting block (312). One end of the rotating shaft (314) is fixedly connected to an eccentric block (315) that is rollingly connected to the outside of the roller (313). The striking block (311) is reciprocally slidably connected to the lower surface of the moving plate (14) through the eccentric block (315).

4. The fatigue testing device for an automotive electric power steering system assembly according to claim 1, characterized in that: A reset structure is provided between the first fixing block (32) and the second fixing block (33). The reset structure includes guide blocks (316) that are fixedly connected to the outside of the first fixing block (32) and the second fixing block (33), respectively. A tension spring (317) is fixedly connected between the two guide blocks (316).

5. The fatigue testing device for an automotive electric power steering system assembly according to claim 1, characterized in that: The number of elastic telescopic rods (43) is four. The four elastic telescopic rods (43) are distributed in a rectangular shape between the support plate (41) and the mounting plate (42). The support plate (41) and the mounting plate (42) are rotatably connected to a hinge seat in the middle.

6. The fatigue testing device for an automotive electric power steering system assembly according to claim 3, characterized in that: The adjustment structure (5) includes a mounting bracket (51) fixedly connected to the top of the base (11). A limiting sleeve (52) is fixedly connected inside the mounting bracket (51). A moving rod (53) extending to the outside of the limiting sleeve (52) is slidably connected inside the limiting sleeve (52). A transmission disc (54) abutting against the lower surface of the eccentric block (315) is fixedly connected to the top of the moving rod (53). A return spring (55) is fixedly connected between the limiting sleeve (52) and the transmission disc (54). The return spring (55) is connected around the outside of the moving rod (53).

7. The fatigue testing device for an automotive electric power steering system assembly according to claim 6, characterized in that: The moving rod (53) has a sliding connection inside to a pressure rod (56) extending to its lower surface and abutting against the top of the abutting plate (44). The moving rod (53) has a rotatable connection outside to an adjustment knob (58) extending to its outside and abutting against the outer surface of the pressure rod (56). A guide shaft (57) is also fixedly connected to the inner top wall of the mounting bracket (51). The moving rod (53) is slidably connected to the outside of the guide shaft (57) through a connecting lug.

8. The fatigue testing device for an automotive electric power steering system assembly according to claim 3, characterized in that: The drive mechanism (6) includes a transmission mechanism and a synchronization structure. The transmission mechanism includes a rotating seat (61) rotatably connected inside the moving plate (14) and a forward and reverse motor (63) fixedly installed on the top of the moving plate (14). A worm gear (62) is fixedly installed on the outside of the rotating seat (61). A worm (64) meshing with the worm gear (62) is fixedly connected to the output shaft of one end of the forward and reverse motor (63). Two miniature electric push rods (68) are fixedly installed on the inner wall of the rotating seat (61) and arranged opposite to each other. A clamping plate (69) is fixedly connected to the output shaft of the miniature electric push rod (68). The inner side of the clamping plate (69) abuts against the outer wall of the electric power steering body (21) of the car.

9. The fatigue testing device for an automotive electric power steering system assembly according to claim 8, characterized in that: The synchronization structure includes a transmission wheel (65) fixedly mounted on the output shaft of the other end of the forward and reverse motor (63) and a driven wheel (66) fixedly connected to the end of the rotating shaft (314) away from the eccentric block (315). The transmission wheel (65) and the driven wheel (66) are externally connected by a belt (67).

10. The fatigue testing device for an automotive electric power steering system assembly according to claim 1, characterized in that: The upright plate (12) is fixedly connected to the top of the base (11), the hydraulic cylinder (13) is fixedly installed on the top of the upright plate (12) and extends to its lower surface, the moving plate (14) is fixedly installed on the output end of the hydraulic cylinder (13), the output end of the electric power steering body (21) is connected to the steering fatigue testing machine (15), and the steering wheel (22) is detachably connected to the top of the electric power steering body (21).

Images