A shock absorber with high damping performance

Abstract

The application discloses a high-damping-performance damper and relates to the technical field of dampers. A piston rod module comprises a piston rod body and a main piston valve system. The piston rod body is hollow, and hydraulic oil in an oil storage cylinder module can flow into a nitrogen cylinder module through an internal flow channel of the piston rod body and an oil passing hole on a connecting seat. The piston rod body comprises a first connecting section, an intermediate section and a second connecting section. The first connecting section and the second connecting section are respectively located at two ends of the intermediate section. The first connecting section, the intermediate section and the second connecting section are all hollow and sequentially communicate. The intermediate section comprises a quenching section and two quenching transition sections. The two quenching transition sections are integrally connected to two ends of the quenching section respectively. The first connecting section is used for connecting the main piston valve system, and the first connecting section is subjected to flash plating treatment. An outer periphery of the second connecting section is provided with an anti-rust oil coating. The application can improve the rigidity of the piston rod body, prolong the service life and improve the safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shock absorbers, in particular to a shock absorber with high damping performance. BACKGROUND

[0002] The existing shock absorber cannot adaptively adjust the oil flow resistance according to the actual working condition, resulting in poor adaptability of the vehicle and unable to adapt to different working conditions. Moreover, the piston rod of the existing shock absorber is insufficient in stiffness, which cannot provide sufficient strength to ensure the stability and safety of the vehicle in extreme vehicle conditions, affecting the handling and ride comfort of the vehicle, and may cause early failure of the shock absorber, increasing the maintenance cost and safety hazards of the vehicle.

[0003] Especially in the application of racing cars and high-performance vehicles, insufficient piston rod stiffness will seriously affect the reliability of the shock absorber and the dynamic performance of the whole vehicle. When the vehicle is subjected to high-frequency impact, severe lateral load or continuous high-intensity compression and rebound in extreme conditions, the piston rod with insufficient stiffness is prone to bending deformation, causing seal wear, oil leakage, even inducing resonance and accelerating the risk of fatigue fracture. This not only weakens the damping stability of the shock absorber, causing the vehicle body posture control to be inaccurate, but also reduces the tire ground performance, affecting the driver's control feedback. At the same time, the seal failure and support force fluctuation caused by the deformation or fracture of the piston rod will greatly shorten the service life of the shock absorber, forcing the team to frequently replace parts, increasing the maintenance cost and safety hazards. SUMMARY

[0004] The purpose of the present application is to provide a shock absorber with high damping performance to solve the problems existing in the prior art, improve the stiffness of the piston rod body, prolong the service life and improve the safety.

[0005] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0006] The present application provides a shock absorber with high damping performance, which comprises a nitrogen cylinder module, an oil storage cylinder module, a piston rod module and a connecting seat. The piston rod module comprises a piston rod body and a main piston valve system. The piston rod body is hollow inside, and the hydraulic oil in the oil storage cylinder module can flow into the nitrogen cylinder module through the internal flow channel of the piston rod body and the oil passing hole on the connecting seat. The piston rod body comprises a first connecting section, an intermediate section and a second connecting section. The first connecting section and the second connecting section are located at both ends of the intermediate section, and the first connecting section, the intermediate section and the second connecting section are all hollow inside and sequentially communicate. The intermediate section comprises a quenched section and two quenched transition sections. The two quenched transition sections are integrally connected to both ends of the quenched section, respectively. The first connecting section is used for connecting the main piston valve system, and the first connecting section is subjected to flash plating treatment. The outer periphery of the second connecting section is provided with an anti-rust oil coating.

[0007] Preferably, the nitrogen cylinder module further comprises a buffer elastic module, the first end of the nitrogen cylinder module is connected with the first end of the connecting seat, the second end of the connecting seat is connected with the first end of the piston rod module, the nitrogen cylinder module is internally provided with a floating piston assembly, and the nitrogen cylinder module is used for storing nitrogen on the side corresponding to the floating piston assembly, and is used for passing in hydraulic oil on the side opposite to the floating piston assembly, the first end of the piston rod module is used for connecting a suspension, the second end of the piston rod module extends into the oil storage cylinder module through the first end of the oil storage cylinder module and is connected with the buffer elastic module, the buffer elastic module comprises a mounting seat, a first elastic element and a buffer sleeve which are arranged in the oil storage cylinder module, the first elastic element is located between the second end of the oil storage cylinder module and the mounting seat, the mounting seat and the buffer sleeve are both in sliding connection with the inner wall of the oil storage cylinder module, the buffer sleeve is connected with the second end of the piston rod module, and a liquid flow channel can be formed between the mounting seat and the buffer sleeve, and under the action of the piston rod module, the buffer sleeve contacts the mounting seat and can close the liquid flow channel.

[0008] Preferably, the nitrogen cylinder module comprises a nitrogen cylinder and the floating piston assembly, the nitrogen cylinder is a hollow cylindrical shell, the floating piston assembly is in sliding connection in the nitrogen cylinder, and the outer side wall of the floating piston assembly can contact the inner side wall of the nitrogen cylinder, and the first end of the nitrogen cylinder is connected with the connecting seat through threads.

[0009] Preferably, the oil storage cylinder module comprises an oil storage cylinder, a lower end spring, an upper end spring and a spring transition seat, the oil storage cylinder is used for storing hydraulic oil, the spring transition seat is mounted on the outer periphery of the oil storage cylinder, and the spring transition seat is arranged close to the first end of the oil storage cylinder module, the lower end spring is sleeved on the outer periphery of the oil storage cylinder, the first end of the lower end spring abuts against one side of the spring transition seat, and the second end of the lower end spring abuts against a protrusion arranged on the outer wall of the oil storage cylinder, the upper end spring is sleeved on the outer periphery of the piston rod module, the first end of the upper end spring abuts against one side of the connecting seat, and the second end of the upper end spring abuts against the other side of the spring transition seat.

[0010] Preferably, the second end of the oil storage cylinder is detachably connected with a fixed cover, the fixed cover is coaxially arranged with the oil storage cylinder, the fixed cover is provided with a first limiting protrusion, the first limiting protrusion and the second end of the oil storage cylinder form a first limiting groove, one end of the first elastic element is located in the first limiting groove, the first limiting protrusion is used for limiting the axial position of the first elastic element, and the first limiting groove is used for limiting the radial position of the first elastic element.

[0011] Preferably, the oil storage cylinder, the first elastic element, the mounting seat and the buffer sleeve are coaxially arranged, and sealing structures are arranged between the mounting seat and the oil storage cylinder and between the buffer sleeve and the oil storage cylinder; the buffer sleeve is further provided with a tapered sealing surface at one end facing the mounting seat, and under the action of the piston rod module, the cross-sectional size of the liquid flow channel gradually decreases during the movement of the buffer sleeve towards the mounting seat.

[0012] Preferably, the buffer elastic module further comprises at least two second elastic elements, each of the second elastic elements is located between the mounting seat and the buffer sleeve, and a plurality of the second elastic elements are uniformly distributed along the circumference of the mounting seat.

[0013] Preferably, the main piston valve system is located inside the oil storage cylinder module, the main piston valve system is installed at the second end of the piston rod body, the buffer sleeve is located on one side of the main piston valve system, and the piston rod body is internally provided with an oil passage for the passage of hydraulic oil.

[0014] Preferably, the flash plating film thickness of the outer surface of the first connecting section is 3um-5um; the intermediate section is made of 45# steel material, and the quenching section is subjected to induction quenching and tempering treatment during processing, the surface hardness of the induction quenching is 50HRC~55HRC, the depth of the hardened layer is 1.2mm~1.6mm, the depth of the hardening layer is 350HV1, the outer surface of the intermediate section is subjected to hard chromium plating treatment, the plating layer hardness range of the hard chromium plating is 900HV-1200HV, the number of microcracks of the plating layer is 800fsi / cm²-1300fsi / cm², the microcracks are distributed in a network shape, and after the chromium plating, the temperature is kept at 200℃-220℃ for 2 hours, and the plating layer thickness after polishing is 45±5um.

[0015] Preferably, the connecting seat is further provided with a compression adjusting valve for adjusting the flow resistance of the hydraulic oil passing through the oil passing hole, the second end of the connecting seat is provided with a joint bearing, the connecting seat is used for connecting the suspension through the joint bearing, and one side of the connecting seat is further provided with a rebound adjusting valve, the hydraulic oil in the piston rod module can flow into the oil passing hole of the connecting seat through the rebound adjusting valve; the connecting seat is made of 7075 aluminum alloy material, and the mass percentage of each component in the 7075 aluminum alloy is respectively Si (0-0.4%), Fe (0-0.5%), Cu (1.2%-2.0%), Mn (0-0.3%), Mg (2.1%-2.9%), Cr (0.18%-0.28%), Zn (5.1%-6.1%), Ti (0-0.2%), and the rest is Al and impurities.

[0016] The present application has the following technical effects relative to the prior art:

[0017] The high-damping-performance shock absorber provided by the present application includes a nitrogen cylinder module, an oil storage cylinder module, a piston rod module and a connecting seat. The piston rod body is hollow, and the hydraulic oil in the oil storage cylinder module can enter the nitrogen cylinder module through the internal flow channel of the piston rod body and the oil passing hole on the connecting seat. The circulation of the hydraulic oil realizes gas elastic energy storage + oil-gas separation, so that the high-damping-performance shock absorber is smoother when absorbing impact. The nitrogen pressure can be adjusted according to the requirements, the damping performance is suitable for different road conditions, the adaptability is good, the damping effect is good, the piston rod body is designed to be hollow, which not only reduces the weight but also maintains the necessary strength and rigidity, prolongs the service life and improves the safety. At the same time, the overall mass of the high-damping-performance shock absorber is reduced, and the unnecessary material cost is reduced. The piston rod body includes a first connecting section, an intermediate section and a second connecting section. The first connecting section and the second connecting section are located at two ends of the intermediate section, and the first connecting section, the intermediate section and the second connecting section are all hollow and sequentially communicate. The intermediate section includes a quenched section and two quenched transition sections. The two quenched transition sections are integrally connected to two ends of the quenched section. The hardness and wear resistance of the material are improved through the quenching process, so as to ensure that the piston rod body can withstand repeated stretching, compression and friction during the damping process, prolong the service life of the piston rod body, avoid deformation or wear caused by excessive stress, and avoid stress concentration caused by direct connection of the quenched section and the unquenched section. The quenched transition sections eliminate the stress difference, ensure the structural stability of the whole piston rod body, the first connecting section is used for connecting the main piston valve system, and the first connecting section is subjected to flash plating treatment, which can prevent corrosion without affecting the assembly accuracy of other components. The outer periphery of the second connecting section is provided with a rust-proof oil coating, which reduces the friction between the second connecting section and other components, and has the dual functions of rust prevention and lubrication. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only constitute some of the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the scope of protection of the present application.

[0019] Figure 1 is a partial sectional view of the shock absorber with high damping performance in the present application;

[0020] Figure 2 is a schematic view of the internal structure of the oil storage cylinder in the present application;

[0021] Figure 3 is an enlarged schematic view of A of Figure 2

[0022] Figure 4 is an enlarged schematic view of B of Figure 2

[0023] Figure 5 is a schematic view of the structure of the piston rod body in the present application;

[0024] In the figure: 1 - buffer elastic module, 10 - conical sealing surface, 11 - mounting seat, 12 - first elastic element, 13 - buffer sleeve, 14 - liquid flow channel, 15 - fixed cover, 16 - first limiting protrusion, 17 - second limiting protrusion, 18 - sealing structure, 19 - second elastic element, 2 - oil storage cylinder module, 21 - oil storage cylinder, 22 - lower end spring, 23 - spring transition seat, 24 - upper end spring, 3 - piston rod module, 31 - piston rod body, 32 - main piston valve system, 4 - connecting seat, 5 - compression adjusting valve, 6 - knuckle bearing, 7 - rebound adjusting valve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some of the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the scope of protection of the present application.

[0026] The purpose of the present application is to provide a shock absorber with high damping performance to solve the problems existing in the prior art, improve the rigidity of the piston rod body, prolong the service life, and improve the safety.

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.​​

[0028] As Figures 1-5 shown, the embodiment provides a high damping performance shock absorber, which comprises a nitrogen cylinder module, an oil storage cylinder module 2, a piston rod module 3 and a connecting seat 4, the inside of the piston rod body 31 is hollow, and the hydraulic oil in the oil storage cylinder module 2 can enter the nitrogen cylinder module through the oil hole on the piston rod module 3 and the connecting seat 4, the circulation of the hydraulic oil realizes gas elastic energy storage + oil-gas separation, and then the high damping performance shock absorber is more smooth when absorbing impact, and the nitrogen pressure can be adjusted according to the demand, the damping performance of different road conditions is adapted, the adaptability is good, the damping effect is good, and the piston rod body 31 is designed to be hollow, which not only reduces the weight but also maintains the necessary strength and rigidity, prolongs the service life and improves the safety, at the same time, the overall quality of the whole high damping performance shock absorber is reduced, and the unnecessary material cost is reduced; the piston rod body 31 comprises a first connecting section, a middle section and a second connecting section, the first connecting section and the second connecting section are located at two ends of the middle section respectively, and the first connecting section, the middle section and the second connecting section are all hollow inside and sequentially communicate, the middle section comprises a quenched section and two quenched transition sections, the two quenched transition sections are integrally connected to two ends of the quenched section respectively, the material hardness and wear resistance are improved through the quenching process, so as to ensure that the piston rod body 31 can withstand repeated stretching, compression and friction in the damping process, prolong the service life of the piston rod body 31, avoid deformation or wear due to excessive stress, at the same time, through the setting of the quenched transition section, the stress concentration problem caused by the direct connection of the quenched section and the unquenched section can be avoided, and then the stress difference is eliminated through the quenched transition section to ensure the structural stability of the whole piston rod body 31, the first connecting section is used for connecting the main piston valve system 32, and the first connecting section is subjected to flash plating treatment, which can realize corrosion resistance without affecting the assembly precision of other components, the outer periphery of the second connecting section is provided with an anti-rust oil coating, which reduces the friction between the second connecting section and other components, and takes into account the dual role of rust prevention and lubrication.

[0029] Specifically, the embodiment also includes a buffer elastic module 1, the first end of the nitrogen cylinder module is connected with the first end of the connecting seat 4, the second end of the connecting seat 4 is connected with the first end of the piston rod module 3, the nitrogen cylinder module is internally provided with a floating piston assembly, and the position of the nitrogen cylinder module corresponding to one side of the floating piston assembly is used for storing nitrogen, and the position of the nitrogen cylinder module corresponding to the other side of the floating piston assembly is used for passing in hydraulic oil. The floating piston assembly slides in the nitrogen cylinder module, and one side of the floating piston assembly is for nitrogen and the other side is communicated with hydraulic oil, thereby adjusting the gas volume through the movement of the floating piston assembly. The first end of the piston rod module 3 is used for connecting a suspension to transmit the impact force of the suspension. The second end of the piston rod module 3 extends into the oil storage cylinder module 2 through the first end of the oil storage cylinder module 2 and is connected with the buffer elastic module 1, so that the buffer elastic module 1 can act on the inside of the oil storage cylinder module 2 when the piston rod module 3 reciprocates. At the same time, the setting of the buffer elastic module 1 can also significantly increase the buffer stroke of the shock absorber with high damping performance, so that the change of the buffer force value is more gentle and linear, and the damping performance and road adaptability are improved. The buffer elastic module 1 includes a mounting seat 11, a first elastic element 12 and a buffer sleeve 13 arranged in the oil storage cylinder module 2. The first elastic element 12 is located between the second end of the oil storage cylinder module 2 and the mounting seat 11. The mounting seat 11 and the buffer sleeve 13 are both in sliding connection with the inner wall of the oil storage cylinder module 2. The buffer sleeve 13 is connected with the second end of the piston rod module 3. The mounting seat 11 and the buffer sleeve 13 can form a liquid flow channel 14, so that the oil cavity formed by the oil storage cylinder module 2, the mounting seat 11 and the buffer sleeve 13 is significantly increased in pressure, forming a high-pressure cavity. This design greatly improves the buffering effect. When subjected to external impact, the first elastic element 12 can be compressed or rebounded according to the size of the applied pressure under the action of the piston rod module 3. This feature allows the buffer elastic module 1 to uniformly distribute impact energy over a longer stroke. Compared with traditional buffer design, this improved way can effectively reduce the occurrence of peak force, avoid the risk of potential damage to the shock absorber with high damping performance, and improve the structural stability and safety.

[0030] The nitrogen cylinder module includes a nitrogen cylinder and a floating piston assembly, the floating piston assembly is in sliding connection in the nitrogen cylinder, and the outer side wall of the floating piston assembly can contact the inner side wall of the nitrogen cylinder, thereby isolating the space on both sides of the floating piston assembly to avoid mixing of nitrogen and hydraulic oil. The first end of the nitrogen cylinder is connected with the connecting seat 4 through threads. The nitrogen cylinder is a hollow cylindrical shell with smooth and high-pressure-resistant inner wall, which can ensure that the nitrogen does not leak and can withstand the internal gas pressure. The nitrogen cylinder is made of high-strength metal material (such as aluminum alloy or steel).

[0031] The oil reservoir module 2 is mainly used to store hydraulic oil, compensate for changes in oil volume, and assist in heat dissipation. It includes an oil reservoir 21, a lower spring 22, an upper spring 24, and a spring transition seat 23. The oil reservoir 21 stores hydraulic oil. The spring transition seat 23 is installed on the outer periphery of the oil reservoir 21, and is positioned close to the first end of the oil reservoir module 2. The lower spring 22 is sleeved on the outer periphery of the oil reservoir 21, with its first end abutting against one side of the spring transition seat 23, and its second end abutting against a protrusion on the outer wall of the oil reservoir 21. The upper spring 24 is sleeved on the outer periphery of the piston rod module 3, and the upper spring 24... The first end abuts against one side of the connecting seat 4, and the connecting seat 4 is provided with a groove for abutting the upper spring 24. The second end of the upper spring 24 abuts against the other side of the spring transition seat 23. Through the above design, the oil reservoir module 2 realizes volume compensation + heat dissipation + filtration, which solves the problems of oil volume change, high temperature and impurity contamination during the operation of the high vibration damper. Together with the nitrogen cylinder and other structures, it ensures the reliability and damping stability of the high vibration damper in high-frequency reciprocating motion. Its structure is simple but its function is critical. Especially under harsh working conditions such as off-road and heavy load, it can play a decisive role in the long-term performance of the high vibration damper.

[0032] The second end of the oil reservoir 21 is detachably connected to a fixing cover 15, and the fixing cover 15 is coaxially arranged with the oil reservoir 21. The fixing cover 15 is provided with a first limiting protrusion 16, and the first limiting protrusion 16 and the second end of the oil reservoir 21 form a first limiting groove. One end of the first elastic element 12 is located in the first limiting groove. The inner wall of the first limiting groove is arc-shaped and matches the shape of the first elastic element 12. The first limiting protrusion 16 is used to limit the axial position of the first elastic element 12, and the first limiting groove is used to limit the radial position of the first elastic element 12. The mounting base 11 is provided with a second limiting protrusion 17, and the second limiting protrusion 17 forms a second limiting groove. The other end of the first elastic element 12 is located in the second limiting groove. The inner wall of the second limiting groove is arc-shaped and matches the shape of the first elastic element 12. The second limiting protrusion 17 is used to limit the axial position of the first elastic element 12, and the second limiting groove is used to limit the radial position of the first elastic element 12. Mounting base 11 serves as the supporting foundation for the first elastic element 12, participating in the transmission and distribution of force. By optimizing the shape of mounting base 11, pressure can be effectively dispersed, reducing localized wear. The fluid flow channel 14 formed by mounting base 11 and buffer sleeve 13 reduces compressive damping force and increases rebound damping force, making the high-performance shock absorber operate more smoothly, avoiding rebound impact, and making vehicle driving more comfortable.

[0033] As a preferred embodiment, the fixing cover 15 is detachably connected to the closed end of the oil reservoir 21 by bolts. The fixing cover 15 is an important structure during installation, which can ensure a stable connection between the first elastic element 12 and the oil reservoir 21.

[0034] The oil reservoir 21, the first elastic element 12, the mounting base 11 and the buffer sleeve 13 are all coaxially arranged, and a sealing structure 18 is provided between the mounting base 11 and the oil reservoir 21, and between the buffer sleeve 13 and the oil reservoir 21, to ensure that the mounting base 11 and the buffer sleeve 13 can seal with the oil reservoir 21 when sliding, so as to avoid oil leakage.

[0035] The buffer sleeve 13 is also provided with a conical sealing surface 10 at the end facing the mounting base 11. Under the action of the piston rod module 3, during the movement of the buffer sleeve 13 toward the mounting base 11, the cross-sectional size of the liquid flow channel 14 gradually decreases, thereby achieving gradual closure. During the movement of the piston rod body 31 in the opposite direction, that is, during the movement of the buffer sleeve 13 away from the mounting base 11, the cross-sectional size of the liquid flow channel 14 gradually increases, thereby achieving gradual opening.

[0036] The buffer elastic module 1 also includes at least two second elastic elements 19, each of which is located between the mounting base 11 and the buffer sleeve 13. The second elastic elements 19 can play a buffering role when the buffer sleeve 13 moves toward the mounting base 11, and can provide elastic force when the buffer sleeve 13 moves away from the mounting base 11, so that the liquid flow channel 14 is opened. The multiple second elastic elements 19 are evenly distributed along the circumference of the mounting base 11, which can provide uniform buffering force and elastic force.

[0037] The main piston valve system 32 is located inside the oil reservoir module 2 and is installed at the second end of the piston rod body 31. The buffer sleeve 13 is located on one side of the main piston valve system 32. The piston rod body 31 has an oil passage for hydraulic oil to pass through. The core function of the piston rod module 3 is to transmit the suspension impact force and ensure the reciprocating motion accuracy of the main piston valve system 32 in the oil reservoir 21. The piston rod module 3 is designed with a high-strength piston rod body 31 and a precision sealing guide as its core design. It serves as a mechanical carrier for force transmission and solves friction, leakage and fatigue problems through surface treatment and structural optimization. Its performance directly affects the response speed (e.g., the lighter the piston rod body 31, the smaller the motion inertia) and service life of the high-damping-performance shock absorber (seal failure will lead to oil leakage and damping force attenuation). It is a key guarantee for the reliability of high-damping-performance shock absorbers under harsh conditions such as off-road and racing.

[0038] The flash coating thickness on the outer surface of the first connecting section is 3µm-5µm; the middle section is made of 45# steel, and the quenched section is induction hardened and tempered during processing. As a preferred embodiment, the surface hardness of the induction hardened section is 50HRC~55HRC, the depth of the hardened layer is 1.2mm~1.6mm, and the depth of the hardened layer is up to 350HV1. The outer surface of the middle section is hard chrome plated, and the hardness of the hard chrome plating layer is in the range of 900HV-1200HV. The number of microcracks in the plating layer is 800fsi / cm²-1300fsi / cm², and the microcracks are distributed in a network. After chrome plating, it is held at 200℃-220℃ for 2 hours (to remove hydrogen), and the thickness of the plating layer after polishing is 45±5µm. This embodiment employs a "micro-cracked chromium" process, combined with a dehydrogenation treatment (baking to remove hydrogen), which improves corrosion resistance, enhances bonding strength, and prevents hydrogen embrittlement failure, thereby ensuring the reliability of the high-damping-performance vibration damper under long-term vibration, humidity, and salt spray environments. See Table 1 below for a comparison between the micro-cracked chromium plating process and the ordinary chromium plating process in this embodiment.

[0039] Table 1 Comparison between micro-crack chrome plating process and ordinary chrome plating process

[0040]

[0041] The connecting seat 4 is also equipped with a compression regulating valve 5. The compression regulating valve 5 is used to adjust the flow resistance of the hydraulic oil passing through the oil passage, and then adjust the damping force by controlling the flow resistance of the hydraulic oil in the compression stroke. When the throttling area is smaller, the oil flow resistance is greater and the compression damping force is stronger, which can be used for off-road and other application scenarios that require strong damping to suppress vehicle body sinking. When the throttling area is larger, the damping force is weaker, which can be used for highway driving and other application scenarios that require gentle buffering, thus improving the applicability range.

[0042] A spherical bearing 6 is provided at the second end of the connecting seat 4. The connecting seat 4 is used to connect the suspension through the spherical bearing 6. A springback regulating valve 7 is also provided on one side of the connecting seat 4. The hydraulic oil inside the piston rod module 3 can flow into the oil passage hole of the connecting seat 4 through the springback regulating valve 7. Preferably, there are multiple oil passage holes. Furthermore, in this embodiment, for the connection design between the connecting seat 4 and other structures, the optimal locking torque value at the joint between the connecting seat 4 and other components needs to be accurately calculated and set to ensure a tight fit between the components and reduce the risk of loosening or slippage. The locking torque is calibrated using special tools to ensure the consistency and reliability of the assembly quality. By constructing a global locking torque collaborative calculation, the locking torque rectangle at each joint point is made into a self-consistent stress field, which improves the overall strength by 20% to 40% and extends the fatigue life to 2.5 times that of the traditional method.

[0043] The connecting seat 4 is made of 7075 aluminum alloy (Al-Zn-Mg-Cu system). The mass percentages of each component in the 7075 aluminum alloy are Si (0~0.4%), Fe (0~0.5%), Cu (1.2%~2.0%), Mn (0~0.3%), Mg (2.1%~2.9%), Cr (0.18%~0.28%), Zn (5.1%~6.1%), Ti (0~0.2%), with the remainder being Al and impurities. In this embodiment, by using 7075-T651 aluminum alloy, the strength is significantly improved, with the yield strength increased by 75% and the tensile strength increased by 90.4%. This indicates that the load-bearing capacity of 7075-T651 aluminum alloy is far greater than that of 6061-T6 aluminum alloy. Under the same cross-sectional area, the ultimate load that 7075-T651 aluminum alloy can withstand is 1.9 times that of 6061-T6 aluminum alloy.

[0044] The design of the piston rod body 31 in this embodiment is particularly suitable for the high-frequency vibration suppression requirements of racing cars under extreme track conditions (such as F1, rally racing, Baja 1000). It is suitable for transient vibration environments with high-frequency impacts of 20Hz~50Hz and amplitudes of ±10~30mm, while meeting the requirements of lightweight (60% weight reduction compared to traditional solid rods) and fatigue life (≥1×10). 7 The system achieves a dual objective (secondary cycle). Engineering verification has shown that under dual-track shifting conditions, it can increase the vibration energy attenuation rate by 18%-22%, without exhibiting buckling failure of the piston rod body 31. Compared to traditional solid rod structures, the dynamic response advantage resulting from the reduced moment of inertia is particularly significant under transient acceleration conditions above 8 m / s². The technical solution is explained below from three aspects: the principle of lightweight structure, the mechanism of mechanical performance enhancement, and the multifunctional integrated design.

[0045] (1) Principle of lightweight structure (optimization of mass moment of inertia)

[0046] The piston rod body 31 adopts a hollow tubular structure instead of the traditional solid rod. While maintaining the same outer diameter, the mass can be reduced by decreasing the cross-sectional area. According to the formula for calculating the mass of a hollow cylinder, m = ρπ(R² - r²)L, the mass m decreases quadratically as the inner diameter r increases. Experimental data shows that when the wall thickness is 30% of the outer diameter, the weight can be reduced by approximately 40%, while still maintaining over 90% of the bending stiffness. In the formula, ρ is the material density of the piston rod body 31 (unit: kg / m³), R is the outer radius of the piston rod body 31 (unit: m), r is the inner radius of the piston rod body 31 (unit: m), and L is the length of the piston rod body 31 (unit: m).

[0047] (2) Mechanism for enhancing mechanical properties (compensation for cross-sectional moment of inertia)

[0048] Traditional solid rods are prone to bending stress concentration (stress amplitude at the root fillet reaches the material fatigue limit) and resonance risk (the natural frequency falls into the operating frequency band of high vibration damping performance, such as 15Hz~25Hz, causing resonance fracture) under alternating loads due to their large mass (high inertia force) and abrupt change in cross-sectional stress gradient.

[0049] In this embodiment, the hollow piston rod body 31 achieves optimized mechanical properties through material distribution on its outer edge, according to the formula for the moment of inertia of a cross section, I=π(R). 4 -r 4 As shown in 4, compared to traditional solid bar structures, the stress concentration factor is greatly reduced, and sufficient bending stiffness can be maintained within a reasonable wall thickness range. Finite element analysis also verifies that when r / R = 0.7, the moment of inertia of the section can still reach 75% of that of a solid structure, while the mass is only 51%. This results in a significant reduction in both mass and moment of inertia compared to a solid bar.

[0050] (3) Multifunctional integrated design

[0051] Built-in flow channel integration: The hollow cavity inside the piston rod body 31 can serve as an oil passage, achieving structural-functional integration;

[0052] Improved dynamic characteristics: The reduced reciprocating mass of the piston rod body 31 increases the system's natural frequency by 12%-18%, which can reduce the accumulation of vibration energy;

[0053] Thermal deformation control: The symmetrical hollow structure of the piston rod body 31, due to the low hardness of the inner wall of the piston rod body 31, can improve the uniformity of the cross-sectional temperature field, and actual measurements show that it can reduce thermal bending deformation by up to 35%;

[0054] A high-frequency quenching process is introduced: 45# steel is used, and the quenching section in the middle is heat-treated by induction hardening and tempering. The surface hardness of the induction hardened layer is 50HRC~55HRC, and the depth of the hardened layer is 1.2mm~1.6mm. This makes the exterior of the piston rod body 31 hard, resulting in a stronger damper with high vibration damping performance. The interior is left untreated, allowing for better internal bending and reducing the risk of breakage. The depth of the hardened layer reaches 350HV1, specifically referring to the vertical distance from the surface to the point where the Vickers hardness (HV) drops to 350 after surface hardening treatment. "HV1" indicates that the load used during testing is 1 kgf (9.81 N). Simultaneously, the middle section is hard chrome plated with a thickness of 900HV0.05-1200HV0.05, specifically indicating a hardness range of 900HV~1200HV (Vickers hardness). The test load is 0.05. kgf, the chromium layer thickness after polishing is 45±5um, which improves wear resistance and corrosion resistance, thereby increasing its service life.

[0055] This design overcomes the bulkiness of traditional solid rods, achieving a balance between lightweight and high performance through an innovative hollow design, making it particularly suitable for applications with stringent power density requirements. The specific application principle of this embodiment is as follows:

[0056] As the core carrier of the high-performance vibration damper, the connecting seat 4, when in use, when the high-performance vibration damper is under compression, the main piston valve system 32 moves away from the connecting seat 4, and part of the oil in the oil reservoir 21 flows to the connecting seat 4 through the inside of the piston rod body 31, passes through the oil passage in the connecting seat 4 and the compression regulating valve 5, and finally enters the nitrogen cylinder. At the same time, the floating piston assembly in the nitrogen cylinder moves towards the second end of the nitrogen cylinder module and compresses the nitrogen. Simultaneously, when the piston rod body 31 moves, it can push the buffer sleeve 13 to move closer to the mounting base 11. As the buffer sleeve 13 compresses the second elastic element 19, the conical sealing surface 10 of the buffer sleeve 13 gradually closes the fluid flow channel 14. When the fluid flow channel 14 is completely closed, the pressure of the oil chamber formed by the oil reservoir 21, the mounting base 11, and the buffer sleeve 13 increases significantly, forming a high-pressure chamber. At this time, the piston rod body 31 continues to move, compressing the first elastic element 12. The pressure of the oil chamber formed by the oil reservoir 21, the mounting base 11, and the buffer sleeve 13 rises sharply, and the hydraulic resistance increases significantly, achieving a stepwise absorption of impact energy.

[0057] When the external load is removed, the device is in the recovery state. At this time, the piston rod body 31 moves away from the mounting base 11, the first elastic element 12 releases its stored energy, and pushes the mounting base 11 to reset the direction of the piston rod body 31. The second elastic element 19 provides auxiliary rebound force. The second elastic element 19 pushes the buffer sleeve 13 to move away from the mounting base 11, opening the fluid flow channel. As the buffer sleeve 13 moves, the fluid flow channel 14 gradually increases in size, and the oil flows back to the low-pressure chamber (i.e., the chamber where the piston rod body 31 is located) through the fluid flow channel 14. At the same time, the piston rod body 31 drives the main piston valve system 32 to move in the opposite direction. The high-pressure nitrogen pushes the floating piston assembly to move in the opposite direction, thereby pushing the oil into the oil passage of the connecting seat 4, and then through the compression regulating valve 5 assembly, through the piston rod body 31, and back into the oil storage tank 21. At this time, the device returns to the standby state.

[0058] A portion of the oil in the oil reservoir 21 can enter the lower chamber of the main piston valve system 32 through the rebound regulating valve 7. Therefore, the compression damping force of the device can be controlled by adjusting the compression regulating valve 5 to control the flow rate of the oil through the compression regulating valve 5 during the compression condition. Similarly, adjusting the rebound regulating valve 7 can control the flow rate of the oil through the main piston valve system 32 during the recovery condition, thereby controlling the rebound damping force.

[0059] This embodiment achieves both weight reduction and necessary strength by designing the piston rod body 31 as hollow; advanced coating technology is applied to enhance the surface hardness of the piston rod body 31, improving wear resistance and corrosion resistance, thereby increasing its service life; high-strength alloy steel is selected as the main material of the connecting seat 4, which has good mechanical properties and effectively resists deformation under high stress; rigorous material screening and testing are conducted to ensure that the selected material can maintain excellent performance under extreme conditions; the optimal locking torque value at the junction of the connecting seat 4 and other components is accurately calculated and set to ensure tight fit between components and reduce the risk of loosening or slippage; special tools are used for locking torque calibration to ensure the consistency and reliability of assembly quality; high-frequency quenching process is introduced during the manufacturing process to achieve local hardening treatment of key parts to meet the rigidity requirements.

[0060] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A shock absorber with high damping performance, comprising a nitrogen cylinder module, an oil storage cylinder module, a piston rod module and a connecting seat, the piston rod module comprising a piston rod body and a main piston valve system, characterized in that: The piston rod body is hollow, and hydraulic oil in the oil storage cylinder module can flow into the nitrogen cylinder module through the internal passage of the piston rod body and the oil passing hole on the connecting seat; the piston rod body comprises a first connecting section, an intermediate section and a second connecting section, the first connecting section and the second connecting section are respectively located at two ends of the intermediate section, and the first connecting section, the intermediate section and the second connecting section are all hollow and sequentially communicate, the intermediate section comprises a quenched section and two quenched transition sections, the two quenched transition sections are integrally connected to two ends of the quenched section respectively, the first connecting section is used for connecting the main piston valve system, and the first connecting section is subjected to flash plating treatment, and the outer periphery of the second connecting section is provided with an anti-rust oil coating; The nitrogen cylinder module further comprises a buffer elastic module, the first end of the nitrogen cylinder module is connected with the first end of the connecting seat, the second end of the connecting seat is connected with the first end of the piston rod module, the nitrogen cylinder module is internally provided with a floating piston assembly, the nitrogen cylinder module is used for storing nitrogen at a position corresponding to one side of the floating piston assembly, and the nitrogen cylinder module is used for introducing hydraulic oil at a position corresponding to the other side of the floating piston assembly, the first end of the piston rod module is used for connecting a suspension, the second end of the piston rod module extends into the oil storage cylinder module through the first end of the oil storage cylinder module and is connected with the buffer elastic module, the buffer elastic module comprises a mounting seat arranged in the oil storage cylinder module, a first elastic element and a buffer sleeve, the first elastic element is located between the second end of the oil storage cylinder module and the mounting seat, the mounting seat and the buffer sleeve are both in sliding connection with the inner wall of the oil storage cylinder module, the buffer sleeve is connected with the second end of the piston rod module, and a liquid flow channel can be formed between the mounting seat and the buffer sleeve, under the action of the piston rod module, the buffer sleeve contacts the mounting seat and can close the liquid flow channel; The end of the buffer sleeve towards the mounting seat is further provided with a tapered sealing surface, and under the action of the piston rod module, the cross-sectional size of the liquid flow channel gradually decreases during the movement of the buffer sleeve towards the mounting seat.

2. Damper according to claim 1, characterized in that The nitrogen cylinder module comprises a nitrogen cylinder and the floating piston assembly, the nitrogen cylinder is a hollow cylindrical shell, the floating piston assembly is in sliding connection in the nitrogen cylinder, and the outer side wall of the floating piston assembly can contact the inner side wall of the nitrogen cylinder, and the first end of the nitrogen cylinder is threadedly connected with the connecting seat.

3. A high-damping performance damper according to claim 1, characterized in that: The oil storage cylinder module comprises an oil storage cylinder, a lower end spring, an upper end spring and a spring transition seat, the oil storage cylinder is used for storing hydraulic oil, the spring transition seat is installed on the outer periphery of the oil storage cylinder, and the spring transition seat is arranged close to the first end of the oil storage cylinder module, the lower end spring is sleeved on the outer periphery of the oil storage cylinder, and the first end of the lower end spring is abutted against one side of the spring transition seat, the second end of the lower end spring is abutted against a protrusion arranged on the outer wall of the oil storage cylinder, and the upper end spring is sleeved on the outer periphery of the piston rod module, and the first end of the upper end spring is abutted against one side of the connecting seat, and the second end of the upper end spring is abutted against the other side of the spring transition seat.

4. Damper according to claim 3, characterized in that: The second end of the oil storage cylinder is detachably connected with a fixed cover, and the fixed cover is coaxially arranged with the oil storage cylinder, the fixed cover is provided with a first limiting protrusion, the first limiting protrusion and the second end of the oil storage cylinder form a first limiting groove, one end of the first elastic element is located in the first limiting groove, the first limiting protrusion is used for limiting the axial position of the first elastic element, and the first limiting groove is used for limiting the radial position of the first elastic element; the mounting seat is provided with a second limiting protrusion, the second limiting protrusion forms a second limiting groove, the other end of the first elastic element is located in the second limiting groove, the second limiting protrusion is used for limiting the axial position of the first elastic element, and the second limiting groove is used for limiting the radial position of the first elastic element.

5. A high-damping performance damper according to claim 3, characterized in that: The oil storage cylinder, the first elastic element, the mounting seat and the buffer sleeve are coaxially arranged, and sealing structures are arranged between the mounting seat and the oil storage cylinder and between the buffer sleeve and the oil storage cylinder.

6. The high-damping performance damper of claim 1, wherein: The buffer elastic module further comprises at least two second elastic elements, each of the second elastic elements is located between the mounting seat and the buffer sleeve, and a plurality of the second elastic elements are uniformly distributed along the circumference of the mounting seat.

7. The high-damping performance damper of claim 1, wherein: The main piston valve system is located inside the oil storage cylinder module, the main piston valve system is installed at the second end of the piston rod body, the buffer sleeve is located on one side of the main piston valve system, and the piston rod body is internally provided with an oil passage for the passage of hydraulic oil.

8. The high-damping performance damper of claim 1, wherein: The flash plating film thickness of the outer surface of the first connecting section is 3um-5um; the intermediate section is made of 45# steel material, and the quenching section is subjected to induction quenching and tempering treatment during processing, the surface hardness of the induction quenching is 50HRC~55HRC, the depth of the hardened layer is 1.2mm~1.6mm, the depth of the hardening layer is 350HV1, the outer surface of the intermediate section is subjected to hard chromium plating treatment, the plating layer hardness range of the hard chromium plating is 900HV-1200HV, the number of microcracks of the plating layer is 800fsi / cm²-1300fsi / cm², the microcracks are distributed in a network shape, and after the chromium plating, the temperature is kept at 200℃-220℃ for 2 hours, and the plating layer thickness after polishing is 45±5um.

9. The high-damping performance damper of claim 1, wherein: The connecting seat is further provided with a compression adjusting valve for adjusting the flow resistance of the hydraulic oil passing through the oil passing hole, a second end of the connecting seat is provided with a joint bearing, the connecting seat is used for connecting a suspension through the joint bearing, one side of the connecting seat is further provided with a rebound adjusting valve, and the hydraulic oil in the piston rod module can flow into the oil passing hole of the connecting seat through the rebound adjusting valve. The connecting seat is made of 7075 aluminum alloy, and in the 7075 aluminum alloy, the mass percentages of Si, Fe, Cu, Mn, Mg, Cr, Zn and Ti are 0-0.4%, 0-0.5%, 1.2%-2.0%, 0-0.3%, 2.1%-2.9%, 0.18%-0.28%, 5.1%-6.1% and 0-0.2% respectively, and the rest is Al and impurities.

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