Fatigue strength testing device for parking brake of motor vehicle

Abstract

The invention relates to the technical field of parking performance detection, in particular to a motor vehicle parking brake fatigue strength testing device which comprises strength testing equipment, and the strength testing equipment is composed of a ramp, a testing table, a supporting piece installed between the ramp and the testing table in a hinged mode and a hydraulic telescopic rod hinged to the lower portion of the testing table. A simulation detection plate is detachably mounted on the top side of the test board; a liquid conveying mechanism used in cooperation with strength testing equipment is arranged below the testing table. According to the fatigue strength testing device for the parking brake of the motor vehicle, frequent wet and slippery working conditions such as rainy days and snow melting can be simulated through circulating watering, so that the fatigue performance of the parking brake is subjected to limit testing, the problems of material abrasion, performance attenuation and the like can be exposed earlier, the testing result is more accurate, and in addition, the fatigue strength testing device can be matched with a simulation testing plate to improve the testing efficiency. Simulation detection plates made of different materials or with different surface conditions can be conveniently replaced according to different test requirements, and the test flexibility and universality are improved.

Description

Technical Field

[0001] This application relates to the field of parking performance testing technology, and in particular to a fatigue strength testing device for motor vehicle parking brakes. Background Technology

[0002] The use of motor vehicles requires fatigue strength testing of parking brakes to inspect the vehicle's braking system. A search revealed patent document CN218156878U, which discloses a motor vehicle parking brake performance testing platform. This application utilizes a test platform rotatably connected to the inside of a ramp. Both ends of the test platform are equipped with first hydraulic cylinders, which drive the two ends of the test platform to rotate around rotating rollers, enabling convenient adjustment of the test platform's bidirectional tilt angle and facilitating convenient testing of parking performance. Regarding the aforementioned technologies, the inventors have discovered at least the following problems: the testing scenario is limited and cannot simulate the most common safety threats; the platform can only test the parking performance of vehicles on dry roads. However, in the real world, wet and slippery slopes after rain, ice, or snow are high-risk scenarios for parking brake failure and vehicle skidding accidents. Therefore, an electric vehicle parking brake fatigue strength testing device is proposed to solve the problems mentioned above. Summary of the Invention

[0003] To address the shortcomings of existing technologies and improve testing results, this application provides a fatigue strength testing device for motor vehicle parking brakes, which has the advantages of simulating harsh and complex real-world usage environments and solves the aforementioned problems.

[0004] This application provides a fatigue strength testing device for motor vehicle parking brakes, which adopts the following technical solution: A fatigue strength testing device for a motor vehicle parking brake includes a strength testing device, which consists of a ramp, a test platform, a support member hinged between the ramp and the test platform, and a hydraulic telescopic rod hinged below the test platform. A simulation test plate is detachably installed on the top side of the test platform. Below the test bench is an infusion mechanism for use with strength testing equipment. The infusion mechanism mainly consists of a drive assembly, a piston assembly, and a lifting plate. The piston assembly includes a pumping cylinder, a piston slidably disposed inside the pumping cylinder, and a connecting rod fixed to one side of the piston and connected to the drive assembly. The lifting plate slidably passes through the interior of the test bench. There are two piston assemblies and two lifting plates. One of the lifting plates has a filter plate detachably installed inside. A connecting rod is hinged between the two lifting plates, and an electric telescopic rod is hinged to the outside of the connecting rod. Below the test platform, there is also a cleaning assembly for processing the filter plate. The cleaning assembly includes a vibration structure and a nozzle, and the nozzle is installed on the top side of the lifting plate with the filter plate. The vibration structure works in conjunction with the nozzle and the electric telescopic rod.

[0005] Optionally: the support assembly includes a support base fixed to the inner bottom wall of the ramp, a hinge block welded to the bottom side of the test bench and hinged to the support base, and the hydraulic telescopic rod hinged to the outer wall of the support base.

[0006] Optionally, the top side of the simulation detection plate is fixed with two limiting plates by bolts, and the two limiting plates are symmetrically distributed, wherein the front and rear sides of the two limiting plates are arranged in a figure-eight shape.

[0007] Optionally: The drive assembly includes a forward and reverse motor fixed to the inner bottom wall of the ramp, a transmission gear fixed on the output shaft of the forward and reverse motor, a toothed plate meshing with the outside of the transmission gear, and the two sides of the toothed plate being fixed to opposite ends of the two connecting rods respectively.

[0008] Optionally: Both sides of the toothed plate are fixed with return springs surrounding the two connecting rods. The interior of the two lifting plates is hollow, and a through hole is opened on the opposite side of the two lifting plates. A three-way pipe is installed on the bottom side of the two lifting plates, and the bottom end of the three-way pipe is connected to one of the pumping cylinders.

[0009] Optionally: The two piston assemblies are symmetrically distributed, and the two piston assemblies are used in conjunction with two lifting plates for conveying and recycling respectively. A first infusion pipe is fixed on the outer wall of the pumping cylinder connected to the three-way pipe, and a second infusion pipe is installed on the outer wall of the other pumping cylinder. Both the first infusion pipe and the second infusion pipe are fixedly connected to the lifting plate with a filter plate.

[0010] Optionally: A U-shaped support frame is fixed between the two pumping cylinders, and a guide rail is fixed on the inner side of the support frame, with the toothed plate slidably connected to the guide rail.

[0011] Optionally: The vibration structure includes a vertical base installed on the bottom side of the test bench. The vertical base has an internal bearing with a rotating shaft installed. A guide wheel and a swing block are respectively installed at both ends of the rotating shaft. A guide plate is provided on the outside of the guide wheel, and the guide plate is fixed to the outer wall of the lifting plate with a filter plate. The guide plate has a guide groove inside that rolls with the guide wheel.

[0012] Optionally: the guide groove is wavy in shape, the inner side of the swing block is hinged with a striking block, the outside of the striking block is provided with a guide cylinder, the striking block is T-shaped, and the striking block generates reciprocating motion through the rolling cooperation of the guide wheel and the guide groove, so as to strike the lifting plate with the filter plate.

[0013] Optionally: A check valve is installed on the outer wall of the guide cylinder, and an air supply pipe communicating with the nozzle is installed at the end of the check valve.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, through cyclic water spraying, can simulate frequent wet and slippery conditions such as rain and snow melting, thereby putting the fatigue performance of the parking brake to the extreme test, exposing problems such as material wear and performance degradation earlier, making the test results more accurate. In addition, it can be used with a simulation test board, which can be easily replaced with simulation test boards of different materials or surface conditions according to different test needs, increasing the flexibility and versatility of the test.

[0015] 2. This invention can conduct continuous dry-wet alternation or continuous wet-slip fatigue tests on brakes on cyclically changing slopes, which can more extreme simulate the complex and harsh parking environment faced by vehicles in the real world, and prioritize the testing of brake materials, sealing and durability, and can expose potential defects in advance. The slope change is provided by the hydraulic telescopic rod and the wet-slip environment is provided by the fluid delivery mechanism. The two can work together to create extremely harsh test conditions.

[0016] 3. This invention uses two lifting plates that move upwards, along with limiting plates, to shield the test platform from all sides. The limiting plates provide clear driving boundaries and positioning references for the vehicle, ensuring that the vehicle is in the correct position during testing and avoiding positional deviations that could affect test results. The shielding structure formed by the lifting plates and limiting plates effectively prevents the vehicle from accidentally sliding off the test platform during testing, ensuring the safety of test personnel and the vehicle, and reducing risks during the testing process. At the same time, the lifting plates can also guide the liquid, and with their internal through-holes for recycling, the filter plate can filter impurities in the liquid, ensuring long-term stable operation of the liquid circulation and improving the reliability and durability of the test.

[0017] 4. In this invention, the striking block, which is hinged to the inner side of the swing block, reciprocates within the guide cylinder. The check valve and the air supply pipe on the outer wall of the guide cylinder are connected to the nozzle. The reciprocating motion of the striking block strikes the lifting plate with the filter plate, causing the filter plate to vibrate. At the same time, the nozzle can spray gas to assist in cleaning impurities on the filter plate, effectively cleaning impurities on the filter plate and improving the cleaning effect. Attached Figure Description

[0018] Figure 1This is a three-dimensional view of the entire application; Figure 2 This is a cross-sectional view of the test bench in this application; Figure 3 This is a schematic diagram of the strength testing equipment used in this application; Figure 4 This is a cross-sectional view of the infusion mechanism of this application; Figure 5 This is a schematic diagram of the cleanup components in this application.

[0019] Explanation of reference numerals in the attached figures: Strength testing equipment; 11. Ramp; 12. Test bench; 13. Support base; 14. Hinge block; 15. Hydraulic telescopic rod; 16. Limiting plate; 17. Simulation test plate; 2. Infusion mechanism; 21. Drive assembly; 2101. Forward and reverse motor; 2102. Transmission gear; 2103. Gear plate; 22. Pump cylinder; 23. Piston; 24. Connecting rod; 25. Lifting plate; 26. T-pipe; 27. Support frame; 28. Guide rail; 2 9. Connecting rod; 210. Electric telescopic rod; 211. Filter plate; 212. First infusion tube; 213. Second infusion tube; 214. Return spring; 3. Through hole; 4. Cleaning assembly; 41. Vibration structure; 411. Vertical seat; 412. Rotating shaft; 413. Guide wheel; 414. Guide plate; 415. Guide groove; 416. Swing block; 417. Guide cylinder; 418. Striking block; 419. Gas infusion tube; 42. Nozzle. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0021] This application discloses a fatigue strength testing device for a motor vehicle parking brake, including a strength testing device 1. The strength testing device 1 consists of a ramp 11, a test platform 12, a support member hinged between the ramp 11 and the test platform 12, and a hydraulic telescopic rod 15 hinged below the test platform 12. A simulated testing plate 17 is detachably mounted on the top side of the test platform 12. It should be noted that the simulated testing plate 17 is fixed to the test platform 12 by bolts, and a pressure sensing device is installed inside the test platform 12. The pressure sensing device inside the test platform 12 can measure the pressure applied to the test platform by the motor vehicle during parking braking in real time and accurately. These pressure data are an important basis for evaluating the fatigue strength of the parking brake, and accurate acquisition of pressure information is crucial. Specifically, during testing, the simulation test board 17 is selected according to the requirements, which can simulate different roads, such as road surfaces with different roughness and friction coefficients. This allows the test to more comprehensively cover various road environments that motor vehicles may encounter in actual driving, greatly improving the fit between the test results and the actual situation, and making the assessment of the fatigue strength of motor vehicle parking brakes more realistic and reliable.

[0022] Specifically, the support assembly includes a support base 13 fixed to the inner bottom wall of the ramp 11, a hinge block 14 welded to the bottom side of the test bench 12 and hinged to the support base 13, and four hydraulic telescopic rods 15 hinged to the outer wall of the support base 13. The output of the hydraulic telescopic rods 15 adjusts the angle of the test bench 12. The extension and retraction of the hydraulic telescopic rods 15 pushes the test bench 12 to rotate around the hinge point, thereby changing the angle of the test bench 12 relative to the ramp 11. This allows for convenient and flexible simulation of parking braking conditions of motor vehicles at different slopes, such as forward and backward tilting, meeting the needs of testing various slope conditions and making the testing more comprehensive and in-depth.

[0023] To further improve the testing effect, an infusion mechanism 2 for use with the strength testing equipment 1 is provided below the test platform 12. The infusion mechanism 2 mainly consists of a drive assembly 21, a piston assembly, and a lifting plate 25. The piston assembly includes a pumping cylinder 22, a piston 23 slidably disposed inside the pumping cylinder 22, and a connecting rod 24 fixed to one side of the piston 23 and connected to the drive assembly 21. The lifting plate 25 slides through the interior of the test platform 12. There are two piston assemblies and two lifting plates 25. A filter plate 211 is detachably installed inside one of the lifting plates 25. A connecting rod 29 is hinged between the two lifting plates 25, and an electric telescopic rod 210 is hinged to the outside of the connecting rod 29. The electric telescopic rod 210 is hinged to the bottom side of the test platform 12. It should be noted that two limiting plates 16 are fixed to the top side of the simulation test plate 17 by bolts, and the two limiting plates 16 are symmetrically distributed. The front and rear sides of the two limiting plates 16 are arranged in a figure-eight shape. Specifically, the limiting plates 16 provide clear driving boundaries and positioning references for the vehicle, ensuring that the vehicle is in an accurate position during the test and avoiding the impact of position deviation on the test results. The shielding structure formed by the lifting plate 25 and the limiting plates 16 can effectively prevent the vehicle from accidentally sliding off the test platform 12 during the test, ensuring the safety of the test personnel and the vehicle, and reducing the risks during the test. At the same time, the lifting plate can also guide the liquid, and with its internal through holes 3, it can be recycled and filtered by the filter plate 211 to filter impurities in the liquid, ensuring the long-term stable operation of the liquid circulation and improving the reliability and durability of the test.

[0024] In this embodiment, the drive assembly 21 includes a forward and reverse motor 2101 fixed to the inner bottom wall of the ramp 11. A transmission gear 2102 is fixed on the output shaft of the forward and reverse motor 2101. A toothed plate 2103 meshes with the outside of the transmission gear 2102. The two sides of the toothed plate 2103 are respectively fixed to one end of the two connecting rods 24. Specifically, a return spring 214 is fixed on both the left and right sides of the toothed plate 2103, surrounding the outside of the two connecting rods 24. The other side of the return spring 214 is fixed to the outer wall of the pumping cylinder 22. The presence of the return spring 214 can... To reduce the impact force on components such as connecting rod 24 and pumping cylinder 22 during the movement of toothed plate 2103, and to reduce the risk of damage to these components due to frequent large impacts, thereby extending the service life of the entire drive assembly 21 and related components and reducing the maintenance cost of the equipment; it should be noted that both lifting plates 25 are hollow inside, and both lifting plates 25 have through holes 3 on opposite sides. A three-way pipe 26 is installed on the bottom side of the two lifting plates 25, and the bottom end of the three-way pipe 26 is connected to one of the pumping cylinders 22.

[0025] Furthermore, the two piston assemblies are symmetrically distributed, and are used in conjunction with two lifting plates 25 for conveying and recycling, respectively. A first infusion pipe 212 is fixed to the outer wall of the pumping cylinder 22 connected to the three-way pipe 26, and a second infusion pipe 213 is installed on the outer wall of the other pumping cylinder 22. Both the first and second infusion pipes 212 and 213 are fixedly connected to the lifting plate 25 equipped with a filter plate 211. Specifically, solenoid valves can be installed at both ends of the three-way pipe 26 connected to the two lifting plates 25, allowing for opening and closing as needed. The liquid can be circulated and recycled between the two lifting plates 25 via the pumping cylinder 22 and the infusion pipes, simulating frequent wet and slippery conditions such as rain and snow melting. The lifting plate 25 with the filter plate 211 can filter impurities in the liquid, preventing them from entering the pumping cylinder 22 and affecting the normal movement of the piston assemblies, thus ensuring long-term stable operation of the liquid circulation. In addition, the flow direction and flow rate of the liquid can be easily controlled according to the test requirements. For example, when simulating wet and slippery conditions of different intensities, the reciprocating distance of the toothed plate 2103 can be used to change the liquid delivery speed and quantity, thereby more accurately simulating various actual wet and slippery environments and improving the flexibility and accuracy of the test.

[0026] To ensure the stable movement of the toothed plate 2103, a U-shaped support frame 27 is fixed between the two pumping cylinders 22. A guide rail 28 is fixed on the inner side of the support frame 27, and the toothed plate 2103 is slidably connected to the guide rail 28. The guide rail 28 guides the movement of the toothed plate 2103, ensuring that the toothed plate 2103 always moves along the predetermined trajectory during reciprocating motion without deviation or shaking. This ensures that the transmission gear 2102 and the toothed plate 2103 always maintain a good meshing state, avoiding transmission failures caused by unstable movement of the toothed plate 2103, and improving the reliability and stability of the entire drive assembly 21.

[0027] To better collect liquid, a cleaning assembly 4 for processing the filter plate 211 is also provided below the test platform 12. The cleaning assembly 4 includes a vibration structure 41 and a nozzle 42, with the nozzle 42 installed on the top side of the lifting plate 25 with the filter plate 211. The vibration structure 41, the nozzle 42, and the electric telescopic rod 210 work together in a coordinated manner. Specifically, the vibration structure 41 includes a vertical base 411 installed on the bottom side of the test platform 12. A rotating shaft 412 is installed in the bearing inside the vertical base 411. Guide wheels 413 and swing blocks 416 are respectively installed at both ends of the rotating shaft 412. A guide plate 414 is provided on the outside of the guide wheel 413, and the guide plate 414 is fixed to the outer wall of the lifting plate 25 with the filter plate 211. A guide groove 415 is opened inside the guide plate 414 to roll with the guide wheel 413.

[0028] It should be noted that the guide groove 415 has a wavy shape, and the inner side of the swing block 416 is hinged with a striking block 418. The outside of the striking block 418 is provided with a guide cylinder 417, which is fixed to the outer wall of the reciprocating plate 25 with the filter plate 211. The striking block 418 has a T-shaped shape, and the striking block 418 generates reciprocating motion through the rolling cooperation between the guide wheel 413 and the guide groove 415, thereby striking the lifting plate 25 with the filter plate 211. The vibration can loosen and remove impurities on the filter plate 211, effectively cleaning the dirt and impurities accumulated on the surface of the filter plate 211, improving the filtration efficiency of the filter plate 211, and ensuring that the liquid can pass smoothly through the filter plate 211 for collection, thus better collecting the liquid. In addition, a maintenance plate is provided inside the lifting plate 25 for handling the filter plate 211 and impurities.

[0029] It should be noted that a check valve is installed on the outer wall of the guide cylinder 417, and an air supply pipe 419 connected to the nozzle 42 is installed at the end of the check valve. When the vibration structure 41 is working, the gas pressure change in the guide cylinder 417 will cause the gas to enter the nozzle 42 through the check valve and the air supply pipe 419. The nozzle 42 can spray out gas to purge the filter plate 211. By combining gas purging with vibration, impurities on the filter plate 211 can be cleaned more thoroughly, preventing impurities from clogging the filter plate 211 and ensuring the smooth passage and collection of liquid.

[0030] Combined with appendix Figures 1-5 The working principle of the above embodiments is as follows: First, select the simulation test plate 17 according to the requirements. It can simulate different roads. Then, the vehicle drives through the ramp 11 to the test platform 12. Next, the electric telescopic rod 210 drives the two lifting plates 25 to move up, and the limiting plate 16 blocks the four sides of the test platform 12. During testing, the angle of the test bench 12 is adjusted by the output of the hydraulic telescopic rod 15. The extension and retraction of the hydraulic telescopic rod 15 pushes the test bench 12 to rotate around the hinge point, thereby changing the angle of the test bench 12 relative to the ramp 11, simulating the parking braking situation of a motor vehicle under different slopes. When further simulation of the testing environment is required, the forward and reverse motor 2101 starts, and its output shaft drives the transmission gear 2102 to rotate. The transmission gear 2102 meshes with the toothed plate 2103, thereby driving the toothed plate 2103 to perform reciprocating linear motion. The two sides of the toothed plate 2103 are fixed to two connecting rods 24 respectively. When the toothed plate 2103 moves, it drives the piston 23 to reciprocate within the pumping cylinder 22 through the connecting rods 24. The return spring 214 can assist the piston 23 in returning to its original position, ensuring the smoothness of the piston 23's movement. The two piston assemblies are symmetrically distributed and equipped with... Two lifting plates 25 are used for conveying and recovering liquid respectively. The pumping cylinder 22 connected to the three-way pipe 26 conveys liquid to the lifting plate 25 with filter plate 211 through the first liquid delivery pipe 212. The other pumping cylinder 22 recovers liquid from the lifting plate 25 with filter plate 211 through the second liquid delivery pipe 213. The lifting plate 25 is hollow inside and has a through hole 3 on the opposite side. The three-way pipe 26 is connected to the pumping cylinder 22 and the lifting plate 25 to realize the liquid conveying and recovery operation, thereby simulating frequent rainy days, snow melting and other slippery working conditions.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fatigue strength testing device for a motor vehicle parking brake, characterized in that: The strength testing equipment (1) consists of a ramp (11), a test platform (12), a support member hinged between the ramp (11) and the test platform (12), and a hydraulic telescopic rod (15) hinged below the test platform (12). The test platform (12) is detachably equipped with a simulation test plate (17). Below the test bench (12) is an infusion mechanism (2) used by the strength testing equipment (1). The infusion mechanism (2) is mainly composed of a drive assembly (21), a piston assembly and a lifting plate (25). The piston assembly includes a pumping cylinder (22), a piston (23) slidably disposed inside the pumping cylinder (22) and a connecting rod (24) fixed to one side of the piston (23) and connected to the drive assembly (21). The lifting plate (25) slides through the interior of the test bench (12). There are two piston assemblies and two lifting plates (25). One of the lifting plates (25) has a filter plate (211) detachably installed inside. A connecting rod (29) is hinged between the two lifting plates (25), and an electric telescopic rod (210) is hinged to the outside of the connecting rod (29). Below the test bench (12) is a cleaning assembly (4) for processing the filter plate (211). The cleaning assembly (4) includes a vibration structure (41) and a nozzle (42). The nozzle (42) is installed on the top side of the lifting plate (25) with the filter plate (211). The vibration structure (41) works in conjunction with the nozzle (42) and the electric telescopic rod (210).

2. The fatigue strength testing device for a motor vehicle parking brake according to claim 1, characterized in that: The support assembly includes a support base (13) fixed to the inner bottom wall of the ramp (11), a hinge block (14) welded to the bottom side of the test bench (12) and hinged to the support base (13), and a hydraulic telescopic rod (15) hinged to the outer wall of the support base (13).

3. The fatigue strength testing device for a motor vehicle parking brake according to claim 1, characterized in that: The top side of the simulation detection plate (17) is fixed with two limiting plates (16), and the two limiting plates (16) are symmetrically distributed. The front and rear sides of the two limiting plates (16) are arranged in a figure-eight shape.

4. The fatigue strength testing device for a motor vehicle parking brake according to claim 1, characterized in that: The drive assembly (21) includes a forward and reverse motor (2101) fixed to the inner bottom wall of the ramp (11). A transmission gear (2102) is fixed on the output shaft of the forward and reverse motor (2101). A toothed plate (2103) meshes with the outside of the transmission gear (2102). The two sides of the toothed plate (2103) are respectively fixed to one end of the two connecting rods (24).

5. The fatigue strength testing device for a motor vehicle parking brake according to claim 4, characterized in that: The toothed plate (2103) has a return spring (214) fixed on both sides of the toothed plate (2103) and surrounding the two connecting rods (24). The two lifting plates (25) are hollow inside, and the two lifting plates (25) have through holes (3) on opposite sides. The bottom side of the two lifting plates (25) is equipped with a three-way pipe (26), and the bottom end of the three-way pipe (26) is connected to one of the pumping cylinders (22).

6. The fatigue strength testing device for a motor vehicle parking brake according to claim 5, characterized in that: The two piston assemblies are symmetrically distributed, and the two piston assemblies are used in conjunction with two lifting plates (23) for conveying and recycling respectively. The pumping cylinder (22) connected to the three-way pipe (26) has a first infusion pipe (212) fixed on its outer wall, and the other pumping cylinder (22) has a second infusion pipe (213) installed on its outer wall. The first infusion pipe (212) and the second infusion pipe (213) are both fixedly connected to the lifting plate (25) with a filter plate (211).

7. The fatigue strength testing device for a motor vehicle parking brake according to claim 4, characterized in that: A U-shaped support frame (27) is fixed between the two pumping cylinders (22), and a guide rail (28) is fixed on the inner side of the support frame (27). The toothed plate (2103) is slidably connected to the guide rail (28).

8. The fatigue strength testing device for a motor vehicle parking brake according to claim 1, characterized in that: The vibration structure (41) includes a vertical seat (411) installed on the bottom side of the test bench (12). The internal bearing of the vertical seat (411) is equipped with a rotating shaft (412). The two ends of the rotating shaft (412) are respectively equipped with a guide wheel (413) and a swing block (416). The guide wheel (413) is provided with a guide plate (414) on its outside. The guide plate (414) is fixed to the outer wall of the lifting plate (25) with a filter plate (211). The guide plate (414) is provided with a guide groove (415) that rolls with the guide wheel (413).

9. The fatigue strength testing device for a motor vehicle parking brake according to claim 8, characterized in that: The guide groove (415) has a wave-shaped shape. The inner side of the swing block (416) is hinged with a striking block (418). The outside of the striking block (418) is provided with a guide cylinder (417). The striking block (418) has a T-shaped shape. The striking block (418) generates reciprocating motion through the rolling cooperation between the guide wheel (413) and the guide groove (415), thereby realizing the striking of the lifting plate (25) with the filter plate (211).

10. The fatigue strength testing device for a motor vehicle parking brake according to claim 9, characterized in that: A check valve is installed on the outer wall of the guide tube (417), and an air supply pipe (419) connected to the nozzle (42) is installed at the end of the check valve.

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