High-precision automobile shock absorber and manufacturing method thereof

Abstract

The application discloses a high-precision automobile shock absorber and a manufacturing method thereof, and aims to provide the high-precision automobile shock absorber with high sealing reliability, improved fatigue life and assembly consistency and the manufacturing method thereof, and the technical scheme is as follows: a cylinder and a chamber containing hydraulic oil arranged in the cylinder are included; a rolling sealing structure is arranged at one end of the cylinder; a reciprocating piston rod assembly, an end cover guide assembly and an oil seal guide seat assembly are arranged in the cylinder; the piston rod assembly comprises a piston rod arranged in the cylinder and a piston arranged at one end of the piston rod in the cylinder; the end cover guide assembly is sealingly mounted at the extending end of the piston rod; the end cover guide assembly comprises a plurality of guide sleeves and a multi-stage sealing structure, and is used for guiding the piston rod and preventing hydraulic oil from leaking. The application is suitable for the technical field of shock absorbers.

Description

Technical Field

[0001] This invention relates to the field of shock absorber technology, and more specifically, to a high-precision automotive shock absorber and its manufacturing method. Background Technology

[0002] In the overall structure of a car, the shock absorber is one of the most crucial components, playing a key role in the smoothness and safety of the ride. When a car travels on different road conditions, uneven surfaces cause vibrations in the wheels, which are transmitted to the car body through the suspension system. Without shock absorbers to effectively suppress these vibrations, passengers inside the car will experience strong bumps, reducing ride comfort and affecting the driver's control of the vehicle, increasing safety risks. Moreover, traditional tubular components suffer from low assembly precision, are prone to noise, and struggle to balance lightweight design with strength. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a high-precision automotive shock absorber with high sealing reliability, improved fatigue life, and assembly consistency, as well as its manufacturing method.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-precision automotive shock absorber, comprising a cylinder and a chamber for containing hydraulic oil within the cylinder, one end of the cylinder having a roll-sealed structure, and a reciprocating piston rod assembly, an end cap guide assembly, and an oil seal guide seat assembly within the cylinder, the piston rod assembly comprising a piston rod disposed within the cylinder and a piston disposed at one end of the piston rod located within the cylinder, the end cap guide assembly being sealed and installed at the extended end of the piston rod, the end cap guide assembly comprising a plurality of guide sleeves and a multi-stage sealing structure for guiding the piston rod and preventing hydraulic oil leakage.

[0005] The present invention is further configured such that: the oil seal guide seat assembly is located at the piston rod extension end, and the oil seal guide seat assembly includes a rolling seal structure and a fixed seal with the cylinder barrel, as well as a dynamic seal formed by the guide sleeve and the piston.

[0006] The present invention is further configured such that the end cap guide assembly and the oil seal guide assembly are coaxially arranged to ensure the coaxial reciprocating motion of the piston rod, reduce piston rod wear, and extend the service life of the shock absorber.

[0007] The present invention is further configured such that: the extended end of the piston rod is provided with a positioning hole for positioning and cooperating with the mounting connector, and the depth of the positioning hole is not less than 7mm.

[0008] This application also provides a method for manufacturing a high-precision automotive shock absorber, including the following steps: S1. Cylinder barrel processing: Select high-quality steel and use advanced processing technology to process the steel into cylinder barrels of specific sizes and shapes. Perform roll forming at one end of the cylinder barrel to form a roll forming sealing structure. S2. Piston rod assembly manufacturing: The piston rod is made of high-strength alloy material and is precision machined and ground to ensure the surface finish and dimensional accuracy of the piston rod. A suitable installation position is machined at one end of the piston rod inside the cylinder for installing the piston. The piston is then precisely installed at the designated position on the piston rod. S3. End cap guide assembly manufacturing and installation: Select materials with good wear resistance and lubrication performance to process several guide sleeves according to design requirements. During the processing, strictly control the inner and outer diameter dimensions of the guide sleeves to ensure their fitting accuracy with the piston rod and cylinder. A multi-stage sealing structure is made using high-performance sealing materials. The pre-processed guide sleeve and multi-stage sealing structure are installed on the extended end of the piston rod to form an end cap guide assembly. During installation, it is necessary to ensure that the installation position of each component is accurate and the sealing is reliable. S4. Manufacturing and installation of oil seal guide seat assembly: The oil seal guide seat assembly is manufactured at the piston rod extension end, including the fixed seal between the rolling seal structure and the cylinder and the dynamic seal formed by the guide sleeve and the piston. The oil seal guide seat assembly is accurately installed at the piston rod extension end to ensure that it is coaxially set with the end cover guide assembly. Through precise installation, the piston rod can reciprocate coaxially, reducing piston rod wear and extending the service life of the shock absorber. S5. Positioning Hole Machining: A positioning hole is machined at the extended end of the piston rod for positioning and mating with the mounting connector. High-precision machining equipment is used to ensure that the depth of the positioning hole is not less than 7mm to ensure the stable installation of the mounting connector. S6. Cavity filling and assembly: Install the machined piston rod assembly, end cap guide assembly and oil seal guide seat assembly into the cylinder. Then fill the cylinder chamber with hydraulic oil. During the filling process, pay attention to removing air from the chamber to ensure that the hydraulic oil filling amount meets the design requirements. S7. Performance Testing and Process: Rigorous quality testing ensures that the produced high-precision automotive shock absorbers meet design requirements and usage standards, guaranteeing their quality. The present invention is further configured such that the performance detection and process in S7 specifically includes: S71. Sealing test: First, use an air tightness tester to test the sealing performance of the cylinder, then fill with hydraulic oil and use a hydraulic oil leakage tester to test the hydraulic oil sealing condition. S72. Damping Force Test: Check whether the damping force tester is working properly, ensure that the sensor accuracy meets the requirements, and that the data acquisition system can accurately record data. Install the shock absorber to be tested on the damping force tester according to the specified installation method, ensuring that the installation is firm, the piston rod of the shock absorber can extend and retract freely, and that it is well connected to the loading device of the tester. Preheat the tester to make it reach a stable working state, and set the test parameters. S73, Testing Process: The constant speed test involves extending and retracting the piston rod of the shock absorber at several different constant speeds, and the tester records the change in damping force of the piston rod at each speed. The speed change test involves extending and retracting the piston rod at gradually varying speeds within a certain stroke range to simulate different working conditions encountered by the shock absorber during actual vehicle operation, and to record the changes in damping. S74. Data Analysis: Analyze the collected damping force data, plot the damping force-velocity curve and damping force-stroke curve to intuitively display the damping characteristics of the shock absorber, compare the tested curves with the design standard curve, and evaluate whether the damping performance of the shock absorber meets the requirements.

[0009] The beneficial effects of this invention are: 1. The rolling seal structure creates a tight and robust seal, effectively preventing hydraulic oil leakage and ensuring stable storage of hydraulic oil within the chamber. This not only reduces the risk of decreased vibration damping performance due to hydraulic oil leakage but also avoids the inconvenience of frequent hydraulic oil replenishment, improving the reliability and service life of the shock absorber. The piston rod reciprocates within the cylinder, and the precision and stability of its movement are crucial for vibration damping. The proper coordination between the piston and piston rod allows the piston rod to respond quickly and drive the piston within the cylinder when encountering road bumps during vehicle operation, using the flow of hydraulic oil to buffer and absorb vibration energy. The inclusion of several guide sleeves ensures that the piston rod maintains linear motion during operation, preventing piston rod deviation and wobbling. This makes the shock absorber's operation more stable, reducing noise and wear caused by uneven piston rod movement. The multi-stage sealing structure further enhances the sealing performance, preventing hydraulic oil leakage from the extended end of the piston rod.

[0010] 2. The rolled sealing structure and the fixed seal between the cylinder and the cylinder barrel ensure that the hydraulic oil inside the cylinder does not leak out from the connection between the oil seal guide assembly and the cylinder barrel, maintaining the sealing and stability of the hydraulic system. This fixed sealing method can withstand greater pressure and vibration, ensuring that the hydraulic oil can be safely stored in the cylinder barrel even when encountering complex road conditions and severe vibrations during vehicle operation, providing a fundamental guarantee for the normal operation of the shock absorber. During the piston rod movement, the dynamic seal between the guide sleeve and the piston effectively prevents hydraulic oil leakage during piston rod movement, ensuring both smooth piston rod movement and preventing hydraulic oil loss. The coaxial arrangement of the end cap guide assembly and the oil seal guide assembly ensures the coaxiality of the piston rod during reciprocating motion. When the piston rod can move along a precise axis, it greatly reduces piston rod wear and effectively extends the service life of the piston rod.

[0011] 3. The presence of positioning holes enables precise positioning between the shock absorber and the mounting connector. Accurate positioning is crucial for ensuring proper coordination of components during automotive assembly. Through the cooperation of the positioning holes and mounting connectors, workers can quickly and accurately install the shock absorber into the designated position, significantly improving installation efficiency. The positioning hole depth is no less than 7mm, greatly enhancing the connection stability between the shock absorber and the mounting connector. Deeper positioning holes provide a larger contact area and stronger support for the connector, better resisting external forces and preventing loosening or detachment. This ensures that the connection between the shock absorber and other automotive components remains secure, improving the reliability and safety of the entire automotive suspension system.

[0012] 4. In terms of materials and processing, high-quality steel and high-strength alloys are selected, and advanced processing technology is adopted to ensure the strength, durability, and dimensional accuracy of components such as cylinders and piston rods. The roll-sealing structure enhances the cylinder's sealing performance and strength. Regarding component manufacturing and installation, material and dimensional control of the end cap guide assembly ensures smooth movement and reliable sealing; the double sealing and coaxial arrangement of the oil seal guide assembly improves sealing performance and reduces piston rod wear; the depth design of the positioning holes ensures stable installation of connecting parts. The chamber filling process eliminates air and ensures sufficient oil volume, guaranteeing the normal operation of the hydraulic system. In performance testing, sealing tests ensure no leakage, and damping force tests evaluate performance by simulating different operating conditions, promptly identifying and resolving problems to provide high-quality vibration reduction solutions for automobiles, improving ride comfort and driving safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 A flowchart illustrating an embodiment of a method for manufacturing a high-precision automotive shock absorber; Figure 1-2Reference numerals in the attached drawings: 1. Cylinder; 2. Chamber; 3. Rolled sealing structure; 4. Piston rod; 5. Piston; 6. Guide sleeve; 7. Multi-stage sealing structure; 8. Positioning hole. Detailed Implementation

[0014] Reference Figure 1-2 The embodiments of the present invention will be further described below.

[0015] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0016] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0017] Figures 1 to 2The high-precision automotive shock absorber shown includes a cylinder 1 and a chamber 2 inside the cylinder 1 for containing hydraulic oil. One end of the cylinder 1 is provided with a rolling seal structure 3, which effectively prevents hydraulic oil leakage and ensures stable storage of hydraulic oil in the chamber 2. This not only reduces the risk of decreased damping performance due to hydraulic oil leakage, but also avoids the trouble of frequently replenishing hydraulic oil, thereby improving the reliability and service life of the shock absorber. The cylinder 1 houses a reciprocating piston rod 4 assembly, an end cap guide assembly, and an oil seal guide assembly. The piston rod 4 assembly includes a piston rod 4 located within the cylinder 1 and a piston 5 located at one end of the piston rod 4 within the cylinder 1. The end cap guide assembly is sealed to the extended end of the piston rod 4 and includes several guide sleeves 6 and a multi-stage sealing structure 7. The piston rod 4 reciprocates within the cylinder 1; the precision and stability of its movement are crucial for vibration damping. The proper coordination between the piston 5 and the piston rod 4 ensures that during vehicle operation, when encountering road bumps, the piston rod 4 responds quickly and drives the piston 5 to move within the cylinder 1, using the flow of hydraulic oil to buffer and absorb vibration energy. The multiple guide sleeves 6 ensure that the piston rod 4 maintains linear motion during movement, preventing deviation and wobbling. This makes the shock absorber's operation more stable and reduces noise and wear caused by uneven piston rod 4 movement. The multi-stage sealing structure 7 further enhances the sealing performance and prevents hydraulic oil from leaking from the extended end of the piston rod 4.

[0018] The oil seal guide seat assembly is located at the extended end of the piston rod 4. This assembly includes a fixed seal between the rolled sealing structure 3 and the cylinder 1, and a dynamic seal formed by the guide sleeve 6 and the piston 5. The fixed seal between the rolled sealing structure 3 and the cylinder 1 ensures that the hydraulic oil inside the cylinder 1 will not leak out from the connection between the oil seal guide seat assembly and the cylinder 1, maintaining the sealing and stability of the hydraulic system. This fixed sealing method can withstand greater pressure and vibration, ensuring that even in complex road conditions and severe vibrations during vehicle operation, the hydraulic oil can be safely stored inside the cylinder 1, providing a fundamental guarantee for the normal operation of the shock absorber. During the movement of the piston rod 4, the dynamic seal between the guide sleeve 6 and the piston 5 effectively prevents hydraulic oil leakage during piston rod 4 movement, ensuring both smooth piston rod 4 movement and preventing hydraulic oil loss.

[0019] The end cap guide assembly and the oil seal guide assembly are coaxially arranged, which ensures the coaxiality of the piston rod 4 during reciprocating motion. When the piston rod 4 can move along a precise axis, the wear of the piston rod 4 is greatly reduced, effectively extending the service life of the piston rod 4.

[0020] The piston rod 4 has a positioning hole 8 at its extended end for positioning and engaging with the mounting connector. Accurate positioning is crucial for ensuring proper coordination of components during vehicle assembly. Through the engagement of the positioning hole 8 with the mounting connector, workers can quickly and accurately install the shock absorber into the designated position, significantly improving installation efficiency. The positioning hole 8 has a depth of at least 7mm, greatly enhancing the connection stability between the shock absorber and the mounting connector. The deeper positioning hole 8 provides a larger contact area and stronger support for the connector, better resisting external forces and preventing loosening or detachment. This ensures the connection between the shock absorber and other vehicle components remains secure, improving the reliability and safety of the entire vehicle suspension system.

[0021] This application also provides a method for manufacturing a high-precision automotive shock absorber, including the following steps: S1. Cylinder barrel 1 processing: Select high-quality steel and use advanced processing technology to process the steel into cylinder barrel 1 of specific size and shape. Perform roll forming at one end of cylinder barrel 1 to form roll forming sealing structure 3. S2, Piston Rod 4 Assembly Manufacturing: Piston Rod 4 is made of high-strength alloy material and is precision machined and ground to ensure the surface finish and dimensional accuracy of Piston Rod 4. A suitable installation position is machined at one end of Piston Rod 4 located inside Cylinder 1 for installing Piston 5. Piston 5 is precisely installed at the designated position of Piston Rod 4. S3. End cap guide assembly manufacturing and installation: Select materials with good wear resistance and lubrication performance to process several guide sleeves 6 according to design requirements. During the processing, strictly control the inner and outer diameter dimensions of the guide sleeves 6 to ensure the fitting accuracy between them and the piston rod 4 and cylinder 1. A multi-stage sealing structure 7 is made using high-performance sealing materials. The pre-processed guide sleeve 6 and the multi-stage sealing structure 7 are installed on the extended end of the piston rod 4 to form an end cover guide assembly. During the installation process, it is necessary to ensure that the installation position of each component is accurate and the sealing is reliable. S4. Manufacturing and installation of oil seal guide seat assembly: The oil seal guide seat assembly is manufactured at the extended end of the piston rod 4, including the fixed seal between the rolling seal structure 3 and the cylinder 1 and the dynamic seal formed by the guide sleeve 6 and the piston 5. The oil seal guide seat assembly is accurately installed at the extended end of the piston rod 4 to ensure that it is coaxially set with the end cover guide assembly. Through precise installation, the piston rod 4 can reciprocate coaxially, reducing the wear of the piston rod 4 and extending the service life of the shock absorber. S5. Machining of positioning hole 8: Machining of positioning hole 8 at the extended end of piston rod 4 for positioning and mating with the mounting connector. High-precision machining equipment is used to ensure that the depth of positioning hole 8 is not less than 7mm to ensure stable installation of the mounting connector. S6. Filling and assembling of chamber 2: Install the machined piston rod 4 assembly, end cap guide assembly and oil seal guide seat assembly into cylinder 1, and then fill the chamber 2 in cylinder 1 with hydraulic oil. During the filling process, pay attention to removing air from the chamber 2 to ensure that the filling amount of hydraulic oil meets the design requirements. The present invention is further configured such that the performance detection and process in S7 specifically includes: S71. Sealing test: First, use an air tightness tester to test the sealing performance of cylinder 1, then fill with hydraulic oil and use a hydraulic oil leakage tester to test the hydraulic oil sealing condition. S72. Damping Force Detection: Check whether the damping force tester is working properly, ensure that the sensor accuracy meets the requirements, and that the data acquisition system can accurately record data. Install the shock absorber to be tested on the damping force tester according to the specified installation method, ensuring that the installation is firm, that the piston rod 4 of the shock absorber can extend and retract freely, and that it is well connected to the loading device of the tester. Preheat the tester to make it reach a stable working state, and set the test parameters at the same time. S73, Testing Process: The constant speed test involves extending and retracting the piston rod 4 of the shock absorber at several different constant speeds, and the tester records the change in damping force of the piston rod 4 at each speed. The speed change test involves extending and retracting the piston rod 4 at gradually varying speeds within a certain stroke range to simulate different working conditions encountered by the shock absorber during actual driving and to record the changes in damping. S74. Data Analysis: Analyze the collected damping force data, plot the damping force-velocity curve and damping force-stroke curve to intuitively display the damping characteristics of the shock absorber, compare the tested curves with the design standard curve, and evaluate whether the damping performance of the shock absorber meets the requirements.

[0022] In terms of materials and processing, high-quality steel and high-strength alloys are selected, and advanced processing technology is adopted to ensure the strength, durability, and dimensional accuracy of components such as cylinder 1 and piston rod 4. The roll-sealed structure 3 enhances the sealing performance and strength of cylinder 1. Regarding component manufacturing and installation, the material and dimensional control of the end cap guide assembly ensures smooth movement and reliable sealing; the double sealing and coaxial arrangement of the oil seal guide assembly improves sealing performance and reduces wear on piston rod 4; the depth design of the positioning hole 8 ensures stable installation of the connecting parts. The chamber 2 is filled to remove air and ensure sufficient oil volume, guaranteeing the normal operation of the hydraulic system. In performance testing, sealing tests ensure no leakage, and damping force tests evaluate performance by simulating different working conditions, promptly identifying and resolving problems to provide high-quality vibration reduction solutions for automobiles, improving ride comfort and driving safety.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision automotive shock absorber, comprising a cylinder (1) and a chamber (2) within the cylinder (1) for containing hydraulic oil, characterized in that, The cylinder (1) has a rolling seal structure (3) at one end. The cylinder (1) is equipped with a reciprocating piston rod (4) assembly, an end cap guide assembly and an oil seal guide seat assembly. The piston rod (4) assembly includes a piston rod (4) located in the cylinder (1) and a piston (5) located at one end of the piston rod (4) in the cylinder (1). The end cap guide assembly is sealed and installed at the extended end of the piston rod (4). The end cap guide assembly includes several guide sleeves (6) and a multi-stage sealing structure (7) for guiding the piston rod (4) and preventing hydraulic oil leakage.

2. The high-precision automotive shock absorber according to claim 1, characterized in that, The oil seal guide seat assembly is located at the extended end of the piston rod (4). The oil seal guide seat assembly includes a fixed seal between the rolling seal structure (3) and the cylinder (1) and a dynamic seal between the guide sleeve (6) and the piston (5).

3. A high-precision automotive shock absorber according to claim 1, characterized in that, The end cap guide assembly and the oil seal guide assembly are coaxially arranged to ensure the coaxial reciprocating motion of the piston rod (4), reduce the wear of the piston rod (4), and extend the service life of the shock absorber.

4. A high-precision automotive shock absorber according to claim 1, characterized in that, The piston rod (4) has a positioning hole (8) at its extended end for positioning and engaging with the mounting connector, and the depth of the positioning hole (8) is not less than 7 mm.

5. A method for manufacturing a high-precision automotive shock absorber according to claims 1-4, characterized in that, Includes the following steps: S1. Cylinder (1) processing: Select high-quality steel and use advanced processing technology to process the steel into cylinder (1) of specific size and shape. Perform rolling processing at one end of the cylinder (1) to form a rolling sealing structure (3). S2, Piston rod (4) assembly manufacturing: The piston rod (4) is made of high-strength alloy material and is precision machined, ground and processed to ensure the surface finish and dimensional accuracy of the piston rod (4). A suitable installation position is machined at one end of the piston rod (4) located inside the cylinder (1) for installing the piston (5). The piston (5) is precisely installed at the designated position of the piston rod (4). S3. End cap guide assembly manufacturing and installation: Select materials with good wear resistance and lubrication performance to process several guide sleeves (6) according to design requirements. During the processing, strictly control the inner and outer diameter of the guide sleeves (6) to ensure the fitting accuracy between them and the piston rod (4) and cylinder (1). A multi-stage sealing structure (7) is made using high-performance sealing materials. The pre-processed guide sleeve (6) and the multi-stage sealing structure (7) are installed on the extended end of the piston rod (4) to form an end cap guide assembly. During the installation process, it is necessary to ensure that the installation position of each component is accurate and the sealing is reliable. S4. Manufacturing and installation of oil seal guide seat assembly: The oil seal guide seat assembly is manufactured at the extended end of the piston rod (4), including the fixed seal between the rolling seal structure (3) and the cylinder (1) and the dynamic seal formed by the guide sleeve (6) and the piston (5). The oil seal guide seat assembly is accurately installed at the extended end of the piston rod (4) to ensure that it is coaxially set with the end cover guide assembly. Through precise installation, the piston rod (4) can reciprocate coaxially, reduce the wear of the piston rod (4), and extend the service life of the shock absorber. S5. Machining of positioning hole (8): Machining of positioning hole (8) at the extended end of piston rod (4) for positioning and mating with mounting connector. High-precision machining equipment is used to ensure that the depth of positioning hole (8) is not less than 7mm to ensure stable installation of mounting connector. S6. Filling and assembling of chamber (2): Install the processed piston rod (4) assembly, end cover guide assembly and oil seal guide seat assembly into the cylinder (1), and then fill the chamber (2) in the cylinder (1) with hydraulic oil. During the filling process, pay attention to removing the air in the chamber (2) to ensure that the filling amount of hydraulic oil meets the design requirements. S7. Performance Testing and Process: Only through rigorous quality testing can we ensure that the high-precision automotive shock absorbers produced meet design requirements and usage standards, thus guaranteeing the quality of the high-precision automotive shock absorbers.

6. The manufacturing method of a high-precision automotive shock absorber according to claim 5, characterized in that, The performance detection and process in S7 specifically includes: S71, Sealing test: First, use an airtightness tester to test the sealing performance of the cylinder (1), and then fill with hydraulic oil and use a hydraulic oil leakage tester to test the hydraulic oil sealing condition. S72, Damping force test: Check whether the damping force tester is working properly, ensure that the sensor accuracy meets the requirements, and that the data acquisition system can accurately record data. Install the damper to be tested on the damping force tester according to the specified installation method, ensure that the installation is firm, that the piston rod (4) of the damper can extend and retract freely, and that it is well connected to the loading device of the tester. Preheat the tester to make it reach a stable working state, and set the test parameters at the same time. S73, Testing Process: In the constant speed test, the piston rod (4) of the shock absorber is made to extend and retract at several different constant speeds, and the tester records the change of damping force of the piston rod (4) at each speed. Speed ​​change test: The piston rod (4) is moved in extension and retraction at a gradually changing speed within a certain stroke range to simulate different working conditions encountered by the shock absorber during actual driving of the car, and the damping change is recorded; S74, Data analysis: The collected damping force data is analyzed, and the damping force-speed curve and damping force-stroke curve are plotted to intuitively show the damping characteristics of the shock absorber. The curves obtained by the test are compared with the design standard curve to evaluate whether the damping performance of the shock absorber meets the requirements.

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