An oil compensation structure and shock absorber

Abstract

The utility model provides a kind of oil compensation structure and shock absorber, oil compensation structure includes compensation valve system, shock absorber main body and recovery electromagnetic valve, recovery electromagnetic valve is communicated with the recovery cavity inside shock absorber main body by compensation valve system, compensation valve system includes upper link ring, lower link ring, compensation spring and compensation valve block, one end of upper link ring is connected with recovery electromagnetic valve and is sealed by valve line, other end is sealed with lower link ring and forms cavity, compensation valve block is set on lower link ring, first connecting boss is formed on one side of upper link ring, one end of compensation spring is interference sleeve joint with first connecting boss, other end presses compensation valve block on lower link ring and seals compensation hole, lower link ring is connected with intermediate cylinder by second connecting boss;Optimization to compensation valve system parts structure and installation mode is realized by the oil compensation structure, the stability of oil seal is promoted, and response speed is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vibration damper technology, specifically relating to an oil compensation structure and a vibration damper. Background Technology

[0002] Shock absorbers are key components in automotive suspension systems. They primarily utilize the resistance of fluid flow or spring force to convert vibration energy into heat energy and dissipate it, thereby damping vibrations and improving vehicle comfort, stability, and safety. Electronically controlled dual-valve shock absorbers use two solenoid valves to control the compression and recovery strokes separately. Compared to single-valve shock absorbers, they offer a wider range of damping force adjustment. With the increasing demand for intelligent vehicle suspension systems, electronically controlled dual-valve shock absorbers are becoming widely used.

[0003] Traditional electronically controlled dual-valve shock absorbers rely solely on piston valves, foot valves, and solenoid valves for hydraulic compensation, resulting in low oil replenishment efficiency. This makes it difficult to maintain dynamic balance in the valve system, accelerating valve wear and affecting the shock absorber's lifespan. Some improvements involve adding a passive valve assembly below the solenoid valve to increase the compensation oil passage and improve compensation efficiency. However, the passive valve assembly has a complex structure, occupies a large space, and suffers from insufficient compression stroke and unstable hydraulic sealing within the connecting valve structure, leading to leaks and defects in the indicator curve. Furthermore, it suffers from complex manufacturing and assembly processes, large space requirements, and high costs, making the product unsuitable for mass production. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an oil compensation structure and a vibration damper, which solves the problems of complex assembly, difficult parts processing, large space occupation leading to insufficient stroke and unstable oil sealing in the existing structure. By optimizing the upper and lower connecting ring structure and the cooperation between the valve block and the lower connecting ring, the damping control accuracy and reliability of the vibration damper are significantly improved. At the same time, the compensation structure is simplified, the assembly process is simplified, the parts processing difficulty and manufacturing cost are reduced, the assembly method is optimized, and the cost is effectively reduced.

[0005] To achieve the above and other related objectives, this utility model provides an oil compensation structure, including a compensation valve system, a shock absorber body, and a recovery solenoid valve. One end of the compensation valve system is connected to the recovery solenoid valve, and the other end is connected to the shock absorber body.

[0006] The compensation valve system includes a lower connecting ring, an upper connecting ring, a compensation spring, and a compensation valve block arranged coaxially. The lower connecting ring and the upper connecting ring are provided with through holes along the axial direction, and the upper connecting ring and the lower connecting ring are connected to form a cavity communicating with the through holes. The compensation spring and the compensation valve block are disposed in the cavity.

[0007] One end of the lower connecting ring overlaps the side of the liquid reservoir of the damper body, and the other end passes through the connecting hole on the liquid reservoir and is sealed to the intermediate cylinder of the damper body. The lower connecting ring is also provided with a compensation hole.

[0008] One end of the upper link ring is connected to the recovery solenoid valve, and the other end is sealed to the end of the lower link ring away from the intermediate cylinder. The center of the upper link ring extends axially toward the lower link ring to form a first connecting boss.

[0009] One end of the compensation spring is interference-fitted to the outer edge of the first connecting boss, and the first connecting boss passes through the compensation spring axially. The other end of the compensation spring presses the compensation valve block against the lower connecting ring. Under the preload of the compensation spring, the compensation valve block normally seals and covers the compensation hole.

[0010] In an optional embodiment of this utility model, a first annular valve line is provided on the connection end face of the upper connecting ring and the recovery solenoid valve, and the upper connecting ring and the recovery solenoid valve form a line seal fit through the first annular valve line.

[0011] In an optional embodiment of this utility model, the side of the lower link ring that is connected to the upper link ring extends axially toward the upper link ring to form an annular protrusion, and the inner circumferential surface of the upper link ring is press-fitted with the outer circumferential surface of the annular protrusion to achieve a sealed connection between the lower link ring and the upper link ring.

[0012] In an optional embodiment of this utility model, the lower connecting ring extends axially toward the intermediate cylinder on the side away from the upper connecting ring to form a second connecting boss. The intermediate cylinder is provided with a flange hole, and the second connecting boss is inserted into the flange hole.

[0013] In an optional embodiment of this utility model, a sealing groove is formed by radially recessing the outer peripheral surface of the second connecting boss. The sealing groove is coaxial with the lower connecting ring, and the sealing element is embedded in the sealing groove to achieve side sealing between the lower connecting ring and the flange hole.

[0014] In an optional embodiment of this utility model, the inner wall of the flange hole is provided with a tapered guide surface, and the guide surface forms an assembly guide gap with the outer wall of the second connecting boss.

[0015] In an optional embodiment of this utility model, a second annular valve line is provided on the connection end face of the lower connecting ring and the compensation valve block, and the lower connecting ring and the compensation valve block form a line seal fit through the second annular valve line.

[0016] In an optional embodiment of this utility model, the compensation valve block is an annular valve plate with an inner diameter larger than the outer diameter of the first connecting boss, and the first connecting boss penetrates the central hole of the compensation valve block.

[0017] In an optional embodiment of this utility model, a plurality of compensation holes are uniformly arranged circumferentially along the upper edge of the lower connecting ring.

[0018] This utility model also proposes a vibration damper, including an oil compensation structure as described in any of the above embodiments.

[0019] The technical advantages of this invention are as follows: By using a compensation valve system for oil compensation, the oil in the dual-valve shock absorber can be compensated to the piston's recovery chamber more quickly during compression, ensuring the balance of the valve system and reducing damage to it. Through the coaxial integrated design of the upper connecting ring, compensation spring, compensation valve block, and lower connecting ring, functions such as guiding, sealing, and oil circuit control are integrated. The structure of the upper and lower connecting rings is optimized, as is the fit between the valve block and the lower connecting ring. Oil compensation can be achieved without the need for multi-stage passive valve assemblies, reducing the number of parts, lowering material and processing costs, simplifying the compensation structure, and simplifying the assembly process. Furthermore, it only requires single-step press fitting without multiple riveting, resulting in a highly efficient assembly process and improved production line efficiency. The optimized structure of the upper and lower connecting rings reduces the need for complex... The valve features a complex structure with steps and grooves, and utilizes a standard annular valve line for sealing, improving processing efficiency. The annular valve line offers high dynamic sealing reliability. The first connecting boss and the compensating spring are interference-fitted, providing good guidance. The first boss penetrates both the compensating spring and the valve plate, and the interference fit between the lower and upper connecting rings ensures coaxiality of the parts and uniform force distribution on the valve block, resulting in reliable sealing. Increased cross-sectional areas of the through-hole and compensating hole enhance oil compensation flow during the compression stroke, shortening the valve system pressure balancing time. The preload and stiffness of the compensating spring can be matched to different operating conditions, enabling precise control of the compensating valve block opening pressure. The compact axial layout provides the spring with greater stroke and more flexible adjustment. The guide surface design of the flanged hole ensures assembly coaxiality, avoiding spatial interference caused by misalignment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an oil compensation structure;

[0022] Figure 2 This is a schematic diagram of the overall structure of the compensation valve system of the oil compensation structure in an optional embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the lower connecting ring of the oil compensation structure in an optional embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the assembly structure of the shock absorber in an optional embodiment of the present invention;

[0025] Figure 5 This is a partial assembly structure diagram of the shock absorber in an optional embodiment of the present invention;

[0026] Figure 6 This is a partial structural diagram of the connection between the compensation valve system, the shock absorber body, and the recovery solenoid valve in an optional embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the overall structure of the vibration damper in an optional embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the overall structure of the vibration damper from another perspective in an optional embodiment of the present invention.

[0029] Label Explanation:

[0030] 100. Compensation valve system; 200. Vibration damper body; 300. Restoration solenoid valve; 400. Compression solenoid valve;

[0031] 110. Upper connecting ring; 120. Lower connecting ring; 130. Compensating spring; 140. Compensating valve block;

[0032] 111. First connecting boss; 112. First annular valve line;

[0033] 121. Compensation hole; 122. First connecting part; 123. Second connecting part; 124. Annular protrusion; 125. Second annular valve line;

[0034] 210. Liquid storage tank; 220. Intermediate cylinder; 230. Working cylinder; 240. Piston valve; 250. Bottom valve;

[0035] 211. Liquid storage chamber; 221. Flanged hole; 222. Upper section of intermediate cylinder; 223. Connecting section of intermediate cylinder; 224. Lower section of intermediate cylinder; 225. Upper chamber of intermediate cylinder; 226. Lower chamber of intermediate cylinder; 231. Compression chamber; 232. Restoration chamber. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Existing electronically controlled dual-valve vibration dampers generally suffer from low oil compensation efficiency, poor sealing reliability, and complex assembly processes. Traditional solutions rely on a series oil replenishment mechanism between solenoid valves and piston valves, resulting in sluggish dynamic balancing of the valve system and accelerated wear of valve components. Some improved solutions add passive compensation structures to increase compensation oil passages, enabling the valve system to achieve balance more quickly, but these solutions suffer from structural complexity, large space occupation, insufficient stroke, and unstable sealing. Please refer to... Figure 1 This is a passive compensation structure. During installation, the clamping valve block 10, lower compensation valve block 20, lower connecting ring 30, and compensation spring 40 need to be riveted together using tooling, while the upper connecting ring 50 is press-fitted in. Ensuring the coaxiality of all three components during press-fitting is crucial. This process is difficult to manufacture, complex, and costly, and prone to oil seal instability due to assembly misalignment, making it unsuitable for mass production. Furthermore, the complex multi-stage design occupies axial space and limits the damper's stroke. Therefore, a simplified, reliable, and efficient oil compensation solution is urgently needed.

[0039] Please see Figures 2 to 6This utility model proposes an oil compensation structure, including a compensation valve system 100, a shock absorber body 200, and a recovery solenoid valve 300. One end of the compensation valve system 100 is connected to the recovery solenoid valve 300, and the other end is connected to the shock absorber body 200. The compensation valve system 100 includes an upper connecting ring 110, a lower connecting ring 120, a compensation spring 130, and a compensation valve block 140 arranged coaxially. The lower connecting ring 120 and the upper connecting ring 110 are provided with through holes along the axial direction. After the lower connecting ring 120 and the upper connecting ring 110 are press-fitted together, they form a cavity that communicates with the through holes to facilitate the flow of oil. One end of the lower connecting ring 120 overlaps the side of the reservoir 210 of the damper body 200 to facilitate the installation of the compensation valve system 100 and forms a cavity with the upper connecting ring 110. The other end passes through the connecting hole on the reservoir 210 and is then sealed to the intermediate cylinder 220. One end of the upper connecting ring 110 is connected to the lower connecting ring 120, and the other end is connected to the recovery solenoid valve 300. The recovery solenoid valve 300 communicates with the internal chamber of the damper through this connection structure. The compensation spring 130 and the compensation valve block 140 are disposed in the cavity of the connecting ring and cooperate to open or close the compensation oil circuit. The compensation spring 130 is connected to the upper connecting ring 110 and presses the compensation valve block 140 onto the lower connecting ring 120. The lower connecting ring 120 has a compensation hole 121. Under the preload of the compensation spring 130, the compensation valve block 140 normally seals and covers the compensation hole 121 to close the compensation oil circuit. When the compensation valve block 140 is opened, the compensation oil circuit is opened to realize oil compensation.

[0040] Please see Figures 2 to 6 During the shock absorber's recovery stroke, the compression of the compensation valve block 140 by the compensation spring 130 can seal the compensation hole 121, ensuring that the shock absorber can quickly build up pressure during the recovery phase, ensuring that the damping force of the shock absorber reaches the required value, and achieving the purpose of vibration reduction. During the shock absorber's compression stroke, the change in oil pressure, in conjunction with the compensation spring 130, lifts the compensation valve block 140 and ensures that the compensation valve block 140 is subjected to uniform force, so that the compensation hole 121 opens and connects with the cavity and the through hole on the connecting ring, opening the compensation oil circuit for efficient oil compensation. The overall structure is simple, with few parts and easy to process. The structure can be integrated by the integrated pressing of the double connecting rings, the assembly process is simple, effectively reducing costs and facilitating mass production.

[0041] Please see Figures 2 to 6Specifically, within the damper body 200, a storage chamber 211 is formed between the storage cylinder 210 and the intermediate cylinder 220. An upper intermediate cylinder chamber 225 and a lower intermediate cylinder chamber 226 are formed between the intermediate cylinder 220 and the working cylinder 230, respectively. Within the working cylinder 230, a compression chamber 231 and a recovery chamber 232 are formed on both sides by a piston valve 240. The upper intermediate cylinder chamber 225 is connected to the recovery chamber 232, and the lower intermediate cylinder chamber 226 is connected to the compression chamber 231. A connection hole is provided on the storage cylinder 210 for installing a solenoid valve. The recovery solenoid valve 300 is installed on one side of the recovery chamber 232 and is connected to the recovery chamber 232 through the compensation valve system 100. The compression solenoid valve 400 is installed on one side of the compression chamber 231 and is connected to the compression chamber 231 through a connecting ring.

[0042] During the compression stroke of the shock absorber, the oil pressure on the compression chamber 231 side of the piston valve 240 continuously increases. Part of the oil flows through the bottom valve 250 and the channel inside the piston valve 240 into the reservoir 210 and the reservoir 211 of the intermediate cylinder 220, as well as the recovery chamber 232 on one side of the piston valve 240. Another part enters the lower chamber 226 of the intermediate cylinder through the through hole on the working cylinder 230, and then flows into the reservoir 211 between the oil reservoir and the intermediate cylinder 220 through the compression solenoid valve 400 at the lower end. During the compression process, the piston valve 240 moves towards the bottom valve 250 side, and the oil in the lower chamber 226 of the intermediate cylinder continuously increases and flows into the reservoir 211, thereby pushing open the compensation valve block 140 on the compensation hole 121. The oil enters the cavity of the connecting ring through the compensation hole 121 and flows out quickly through the through hole into the upper chamber 225 of the intermediate cylinder, further compensating to the recovery chamber 232, thus realizing oil compensation.

[0043] Please see Figures 2 to 6In an optional embodiment of this utility model, one end of the upper connecting ring 110 is connected to the restoration solenoid valve 300, and the other end is sealed to the end of the lower connecting ring 120 away from the intermediate cylinder 220. The compensation spring 130 is coaxially engaged with the upper connecting ring 110. A first connecting boss 111 is formed at the center of the upper connecting ring 110 along the axial direction towards the lower connecting ring 120. One end of the compensation spring 130 is interference-fitted into the outer edge of the first connecting boss 111 for positioning. The first connecting boss 111 passes through the compensation spring 130 along the axial direction to ensure the stability of the connection. The other end of the compensation spring 130 presses the compensation valve block 140 against the inner end face of the lower connecting ring 120. Under the preload of the compensation spring 130, the compensation valve block 140 normally seals and covers the compensation hole 121. During assembly, the upper connecting ring 110 and the lower connecting ring 120 are simply pressed together. The inner diameter of the first connecting boss 111 inside the upper connecting ring 110 guides the installation of the compensation spring 130, and the coaxial installation is ensured by interference fit. The first connecting boss 111 axially passes through the compensation spring 130, increasing the guide length and ensuring reliable assembly. Then, the compensation spring 130 is used to press the compensation valve block 140 onto the lower connecting ring 120 to achieve coaxial cooperation between the compensation valve block 140 and the lower connecting ring 120. Only one pressing step is required, making the installation process simpler, easier to operate, less prone to assembly misalignment, ensuring uniform force on the compensation valve block 140, and ensuring a better seal.

[0044] Please see Figures 2 to 6 In one optional embodiment of this utility model, a first annular valve line 112 is provided on the connection end face of the upper connecting ring 110 and the recovery solenoid valve 300. The upper connecting ring 110 and the recovery solenoid valve 300 form a line seal fit at the contact surface through the first annular valve line 112. The line contact seal replaces the traditional planar seal, which is convenient for installation, reduces the contact area to increase the unit pressure, reduces the wear of the sealing surface, enhances the sealing reliability, reduces the risk of leakage, and eliminates the need for additional sealing groove processing, simplifying the part structure and assembly process. At the same time, it avoids local leakage caused by assembly misalignment, ensures stable establishment of oil pressure in the recovery chamber 232, and improves the damping force response speed. In other embodiments, a sealing groove can also be formed by axially recessing on the connection surface of the upper connecting ring 110 and the recovery solenoid valve 300. A sealing element, such as an O-ring, is embedded in the sealing groove. During installation, the sealing connection between the upper connecting ring 110 and the recovery solenoid valve 300 is achieved by pressing the O-ring.

[0045] Please see Figures 2 to 6In an optional embodiment of this utility model, the upper connecting ring 110 has an overall annular structure, including a top wall for connecting with the reset solenoid valve 300 and a side wall for connecting with the lower connecting ring 120. A first connecting boss 111 is formed at the center of the top wall, and a through hole communicating with the cavity is formed at the center of the first connecting boss 111. The side wall is fitted with the lower connecting ring 120 and sealed through an interference fit. The first connecting boss 111 is used for guiding and connecting the compensation spring 130, and the through hole allows for the flow of oil. The overall structure is simple, easy to process and assemble, reduces costs, and reduces the overall thickness of the parts, thus allowing more space for compensating for the deformation of the spring 130.

[0046] Please see Figures 2 to 6 In an optional embodiment of this utility model, the lower connecting ring 120 includes a first connecting part 122 and a second connecting part 123. The first connecting part 122 overlaps the side of the liquid storage cylinder 210 to ensure the stability of the overall connection of the compensation valve system 100, and forms a cavity with the upper connecting ring 110 in a sealed connection. The side of the first connecting part 122 away from the upper connecting ring 110 extends axially towards the intermediate cylinder 220 to form a second connecting boss, namely the second connecting part 123, which is used to cooperate with the intermediate cylinder 220. The lower connecting ring 120 communicates with the upper cavity 225 of the lower intermediate cylinder through the central through hole. The lower connecting ring 120 is also provided with a compensation hole 121, which can connect the oil storage cavity and the upper cavity 225 of the intermediate cylinder to form a compensation oil circuit.

[0047] Please see Figures 2 to 6 In an optional embodiment of this utility model, the side of the lower connecting ring 120 connected to the upper connecting ring 110 extends axially toward the upper connecting ring 110 to form an annular protrusion 124. The inner circumferential surface of the upper connecting ring 110 and the outer circumferential surface of the annular protrusion 124 are press-fitted together to achieve a sealed connection between the lower connecting ring 120 and the upper connecting ring 110. Specifically, the upper connecting ring 110 is pressed onto the lower connecting ring 120 axially, achieving axial positioning and cavity sealing simultaneously with the radial press-fit, eliminating the need for additional sealing components. The self-centering is achieved through the press-fit between the annular protrusion 124 and the inner wall of the upper connecting ring 110, ensuring the coaxiality of the compensation spring 130, the compensation valve block 140, and the lower connecting ring 120, avoiding uneven force on the valve block leading to uneven wear or sealing failure, and simplifying the assembly and positioning process. The annular protrusion 124 provides radial limiting to prevent the connecting ring from shifting during the press-fitting process, ensuring precise alignment, and enhancing the torsional strength of the connection structure. The annular protrusion 124 is integrated on the lower connecting ring 120. The inner diameter of the upper connecting ring 110 can be matched with the outer diameter of the annular protrusion 124. The part has a simple structure, is easy to process, and effectively reduces processing costs.

[0048] Specifically, the first connecting part 122 has an annular structure, and a stepped plane is machined on the edge of the connecting hole of the liquid storage cylinder 210. One side of the first connecting part 122 overlaps with the stepped surface, and the second connecting part 123 passes through the connecting hole and is inserted into the intermediate cylinder 220. This layout uses the end face of the oil storage cylinder as an axial positioning reference to constrain the assembly position of the lower connecting ring 120, while reducing the structural redundancy between the intermediate cylinder 220 and the oil storage cylinder and optimizing the overall space utilization. The other side of the first connecting part 122 forms an annular protrusion 124. The inner diameter of the inner wall of the upper connecting ring 110 is smaller than the outer diameter of the annular protrusion 124. The two are pressed together by side clamping to achieve a stable sealing connection. The lower end face of the upper connecting ring 110 abuts against the end face of the lower connecting ring 120. The upper connecting ring 110 and the lower connecting ring 120 are pressed into an integral structure.

[0049] Please see Figures 2 to 6 In an optional embodiment of this utility model, a plurality of compensation holes 121 are uniformly arranged circumferentially on the lower connecting ring 120. The inner side of the compensation hole 121 communicates with the cavity. Under normal conditions, the orifice is covered by the compensation valve block 140 to achieve a good seal, so as to ensure that the shock absorber can quickly build up pressure during the recovery stage and achieve vibration reduction. During the compression stroke of the shock absorber, the compensation holes 121 are opened. Through the cooperation of multiple compensation holes 121 and through holes, the oil can be quickly compensated to the recovery cavity 232, ensuring the balance of the valve system and reducing the damage to the valve system. The compensation holes 121 can be set as elongated holes, evenly arranged around the circumference to increase the oil flow area. The evenly distributed hole diversion design can balance the oil pressure distribution, reduce the flow load of a single hole, and prevent high-frequency vibration of the valve plate. The hole diameter or number can be adjusted according to the working conditions to flexibly match different damping force characteristics.

[0050] Please see Figures 2 to 6 In an optional embodiment of this utility model, a second annular valve line 125 is provided on the connecting end face of the lower connecting ring 120 and the compensation valve block 140. The second annular valve line 125 is disposed on both sides of the compensation hole 121. The connecting surface of the lower connecting ring 120 and the compensation valve block 140 forms a line seal fit through the second annular valve line 125, ensuring good sealing of the compensation circuit under normal conditions, avoiding leakage during oil compensation, and enabling the compensation valve block 140 to be quickly opened during the compression stroke of the shock absorber to realize the opening of the compensation oil circuit. After the compensation valve block 140 is disposed on the lower connecting ring 120, the upper end face is pressed by the compensation spring 130 so that the bottom surface can be tightly attached to the second annular valve line 125 on the inner end face of the lower connecting ring 120, and the seal is achieved by the valve line pressing.

[0051] Please see Figures 2 to 6In an optional embodiment of this utility model, the compensating valve block 140 can be an annular valve plate. The annular valve plate uniformly fits the valve line under spring pressure, avoiding deformation failure caused by single-point stress concentration. There is no need to process extra grooves or bosses on the valve plate, achieving good sealing while simplifying the structure and occupying less space. It can provide more space for the deformation of the compensating spring 130. The overall cooperation of the compensating spring 130, the compensating valve block 140 and the valve line achieves rapid sealing and is easy to install. The second annular valve line 125 is set on the lower connecting ring 120 and forms a dynamic line seal with the compensating valve block 140. During the compression stroke, the oil pressure pushes the valve block away from the valve line, and the compensating oil flows into the recovery chamber 232 through the compensation hole 121. During the recovery stroke, the spring preload makes the valve block reset and seal, preventing oil backflow. The dynamic sealing mechanism takes into account both sealing reliability and compensation response speed.

[0052] Understandably, the coordinated design of the annular valve plate and valve line sealing structure, combined with the axially compact layout of the upper and lower connecting rings 120, effectively reduces the space occupied, providing a larger effective stroke for the compensation spring 130. This provides a physical basis for multi-level adjustment of the valve block opening force, enabling the valve block to be opened to compensate for the hydraulic fluid under various selectable force values, and offering greater adjustability. By adjusting the preload and stiffness coefficient of the compensation spring 130, the opening pressure of the compensation valve block 140 can be adjusted. On the one hand, the dynamic matching of spring stiffness and hydraulic pressure eliminates the noise generated by the high-frequency opening and closing of the valve plate; on the other hand, the increased stroke space improves the linearity of the valve block's movement trajectory, shortens the opening response time, and avoids valve plate vibration caused by insufficient stroke, thereby significantly improving the damping force adjustment accuracy and system stability.

[0053] Please see Figures 2 to 6In an optional embodiment of this utility model, one end of the compensating spring 130 abuts against the inner end face of the upper connecting ring 110 and is press-fitted with the first connecting boss 111, while the other end abuts against the end face of the valve block to press it against the inner end face of the lower connecting ring 120. The first connecting boss 111 penetrates the compensating spring 130 to ensure good guidance during assembly. When the compensating spring 130 is compressed after the compensating valve block 140 is pushed open, it is not easy for it to slip, thus ensuring the stability of the oil compensation process. The inner diameter of the compensating valve block 140 is larger than the outer diameter of the first connecting boss 111, and the first connecting boss 111 can penetrate the center hole of the compensating valve block 140. The compensating valve block 140 and the connecting ring are clearance-fitted to limit the radial displacement of the valve plate, ensuring the dynamic stability of the valve plate and ensuring a tight seal. The cover is always aligned to extend the service life of the valve plate. The through holes in the center of the upper connecting ring 110, lower connecting ring 120 and compensating valve block 140 are connected for the flow of oil. The compensating spring 130 is interference-fitted with the first connecting boss 111 to achieve coaxial cooperation with the upper connecting ring 110. The compensating valve block 140 is placed on the lower connecting ring 120 and coaxially cooperates with it. When the upper connecting ring 110 and the lower connecting ring 120 are press-fitted, the compensating spring 130 presses the compensating valve block 140 to make it tightly connected with the inner end face of the lower connecting ring 120 to achieve a seal. One-step press-fit can ensure good coaxiality between the upper connecting ring 110, lower connecting ring 120, compensating spring 130 and compensating valve block 140. The assembly is simple, which can effectively ensure the product qualification rate and facilitate mass production.

[0054] It is understandable that after the upper connecting ring 110 and the lower connecting ring 120 are press-fitted, the distance between the inner end face of the upper connecting ring 110 and the upper end face of the compensation valve block 140 is adapted to the structure of the spring, ensuring that the compensation spring 130 is in a compressed state in the initial state, and can seal the compensation hole 121 by pressing the compensation valve block 140 with the spring inside the cavity.

[0055] Please see Figures 2 to 6In an optional embodiment of this utility model, the second connecting part 123, i.e., the second connecting boss, passes through the connecting hole on the liquid storage cylinder 210 and is sealed to the intermediate cylinder 220. The through hole in the center of the lower connecting ring 120 can communicate with the lower cavity 226 of the intermediate cylinder. The oil entering the cavity through the compensation hole 121 will enter the lower cavity 226 of the intermediate cylinder through the through hole and further enter the restoration cavity 232 to achieve oil compensation. The intermediate cylinder 220 is provided with a flange hole 221. The second connecting boss can be installed by inserting it into the flange hole 221 and sealing it. The flange hole 221 provides radial support, restricts the circumferential displacement of the lower connecting ring 120, ensures the precise alignment of the through hole and the upper cavity 225 of the intermediate cylinder, optimizes the smoothness of the oil compensation path, and the plug-in installation simplifies the assembly process of the intermediate cylinder 220 and the compensation structure, reducing the machining accuracy requirements. The compensation structure overlaps the stepped surface of the oil reservoir through the first connecting part 122. During assembly, the lower connecting ring 120 is simply pressed into the flanged hole 221 of the intermediate cylinder 220, which facilitates installation and observation of the correctness of installation, improves the assembly cycle, and further improves the production line efficiency.

[0056] Please see Figures 2 to 6 In one optional embodiment of this utility model, the second connecting part 123 is inserted into the flanged hole 221 of the intermediate cylinder 220 and connected with a side seal. Specifically, a sealing groove is formed by radially recessing the outer peripheral surface of the second connecting part 123. The sealing groove is coaxial with the lower connecting ring 120, and a sealing element is embedded in the sealing groove to achieve a seal between the lower connecting ring 120 and the flanged hole 221. Specifically, the sealing groove can be, for example, a U-shaped groove, and the sealing element can be, for example, an O-ring, which is assembled in the sealing groove. The O-ring and the inner wall of the flanged hole 221 form a radial compression seal, which adapts to oil pressure fluctuations, avoids leakage of compensating oil from the connection gap, ensures the stability of the oil circuit, and the independent sealing element is easy to replace, reducing maintenance costs. In other embodiments, the outer peripheral surface of the second connecting part 123 can also be treated with rubber vulcanization. The vulcanized rubber is then pressed into the intermediate cylinder 220 to achieve the purpose of sealing. This process is simple and improves the sealing reliability and environmental adaptability.

[0057] Please see Figures 2 to 6 In an optional embodiment of this utility model, the inner wall of the flanged hole 221 is also provided with a tapered guide surface. The guide surface and the outer wall of the second connecting boss form an assembly guide gap for installation. The guide surface guides the centering insertion, compensates for the manufacturing tolerance of the parts, reduces the difficulty of assembly alignment, avoids assembly jamming, improves assembly efficiency, and effectively avoids shear damage to the sealing ring caused by hole shaft misalignment during assembly, thereby improving assembly efficiency and yield.

[0058] It is understandable that the first connecting part 122 and the second connecting part 123 are tubular structures with through holes inside. The two are integrated structures and a smooth transition is achieved at the connection point through an arc. The structure is simple, easy to process, and reduces the processing cost of the parts. On the side near the upper connecting ring 110, a tapered opening is also formed at the edge of the through hole in the center of the lower connecting ring 120 to avoid conflict with the internal structure of the upper connecting ring 110 during press fitting. At the same time, it works with the through hole and the compensation hole 121 to increase the flow area and achieve rapid compensation of the oil.

[0059] Please see Figures 2 to 6 In an optional embodiment of this utility model, during installation, the compensating spring 130 and the borrowing / returning 110 are first coaxially fitted and interference-fitted onto the first connecting boss 111, ensuring good coaxiality between the two during installation; the compensating valve block 140 is disposed on the lower connecting ring 120, and the compensating valve block 140 and the lower connecting ring 120 are coaxially fitted and placed on the lower connecting ring 120, and then the upper connecting ring 110 is press-fitted axially onto the lower connecting ring 120 as a whole, at which point the internal compensating spring 130 and the compensating valve block 140 are interlocked. The compensating valve block 140 is pressed together with the compensating spring 130, which presses the compensating valve block 140 and the lower connecting ring 120 together and covers the sealing compensating hole 121. The compensating valve system 100 is then fully installed. The small interference fit between the compensating spring 130 and the first connecting boss 111, and the interference fit between the upper connecting ring 110 and the lower connecting ring 120, provide good coaxiality and ensure that the compensating valve block 140 receives a stable pressing force, thereby ensuring the stability of the sealing performance of the oil compensation structure. The overall structure is simple, the assembly process is simple, the cost is low, and the pass rate is higher. It ensures that the oil can compensate to the piston's recovery chamber more quickly during the process of the dual-valve vibration damper, ensuring the balance of the valve system and reducing damage to the valve system. The modular design of the components replaces the multi-stage baffle structure, simplifying the component structure and assembly process. The direct pressure preload of the compensating spring 130 achieves a normally closed seal. During the compression stroke, the oil pressure can open the compensating valve block 140 to achieve rapid oil replenishment, significantly improving the dynamic balance capability of the valve system.

[0060] Please see Figures 2 to 6In an optional embodiment of this utility model, the compensation valve system 100 is installed between the intermediate cylinder 220 and the restoring solenoid valve 300 to form an oil compensation structure, which can perform efficient oil compensation during the compression stroke of the shock absorber and quickly achieve the balance of the valve system. This structure simplifies the compensation flow channel through a coaxial design and achieves structural integration through the integrated press-fitting of double connecting rings. It utilizes boss guidance and valve line sealing to ensure coaxiality and sealing reliability. Dynamic sealing is achieved using the preload of the compensation spring 130, resulting in stable oil sealing and ensuring rapid oil pressure establishment during the recovery phase. During the compression phase, the oil can push open the valve block to quickly compensate to the recovery chamber 232. Optimization of component structures increases the oil flow area and reduces space occupation, thereby increasing the stroke of the compensation spring 130, providing greater adjustability, and optimizing the dynamic compensation performance of the oil. The structural design of the compensation valve system 100 reduces the number of parts, lowers processing difficulty, and achieves low-cost, high-reliability oil balance. The single-step press-fitting process significantly reduces assembly complexity. The simple component structure facilitates assembly, improving product qualification rates during assembly and adapting well to mass production needs. The overall structure is simple, facilitating integration and lightweight design.

[0061] Please see Figures 2 to 8 This utility model also proposes a vibration damper, which includes the oil compensation structure as described in any of the above embodiments. Specifically, the vibration damper includes a compensation valve system 100, a vibration damper body 200, a recovery solenoid valve 300, and a compression solenoid valve 400. The vibration damper body 200 includes a reservoir 210, an intermediate cylinder 220, a working cylinder 230, and a piston valve 240. A reservoir chamber 211 is formed between the reservoir 210 and the intermediate cylinder 220. The intermediate cylinder 220 includes an upper section 222, a connecting section 223, and a lower section 224. After the upper section 222, the connecting section 223, and the lower section 224 are press-fitted together, they are further press-fitted with the working cylinder 230. A seal, such as an O-ring, ensures a seal and forms an isolated upper chamber 225 and a lower chamber 226 between the intermediate cylinder 220 and the working cylinder 230. A plug valve 240 is installed inside the working cylinder 230, forming a compression chamber 231 and a recovery chamber 232 on both sides. The compression chamber 231 is located near the bottom valve 250. The upper chamber 225 of the intermediate cylinder is connected to the recovery chamber 232, and the lower chamber 226 of the intermediate cylinder is connected to the compression chamber 231. A connection hole is provided on the oil reservoir to facilitate the installation of the connecting ring and the solenoid valve. The recovery solenoid valve 300 is connected to the recovery chamber 232 through the compensation valve system 100. The compensation valve system 100 includes an upper connecting ring 110, a lower connecting ring 120, a compensation valve block 140, and a compensation spring 130. The compression solenoid valve 400 is connected to the compression chamber 231 through the connecting ring.

[0062] During the shock absorber's recovery stroke, piston valve 240 moves away from bottom valve 250. At this time, the compensating spring 130 presses the valve plate to close the compensating hole 121, ensuring a good seal. The oil flows through the solenoid valve's control channel, quickly building up damping pressure to ensure the shock absorber's damping force reaches the required value, thus achieving vibration reduction. The damping force can be adjusted by regulating the solenoid valve. During the shock absorber's compression stroke, piston valve 240 moves closer to bottom valve 250. At this time, the oil pressure on the compression chamber 231 side of piston valve 240 continuously increases, and part of the oil flows through the bottom valve... The oil flows into the reservoir chamber 211 and the recovery chamber 232 via the paths on valves 250 and 240, respectively. Another portion enters the lower chamber 226 of the intermediate cylinder and then flows into the reservoir chamber 211 through the compression solenoid valve 400 on that side. During compression, the oil pressure continuously increases, overcoming the spring preload and pushing open the valve plate. After the compensation hole 121 opens, the oil enters the cavity and quickly flows into the upper chamber 225 of the intermediate cylinder through the through-hole of the lower connecting ring 120, further compensating the pressure in the recovery chamber 232, shortening the pressure balance time. At the end of the stroke, the spring resets, causing the valve plate to reseal the compensation hole 121. Through a simplified coaxial valve system and dynamic sealing design, efficient oil compensation is achieved, reducing valve system pressure fluctuations and valve system impact noise, effectively extending the life of the solenoid valve.

[0063] In summary, the oil compensation structure and vibration damper of this utility model, through structural optimization of the compensation valve system 100, feature a simple component structure that is easy to process and assemble, reliable sealing, and provides greater adjustable space, enabling flexible structural adjustment to improve response and eliminate noise. The compensation valve system 100 has strong overall functionality, enabling rapid oil compensation during the compression stroke of the vibration damper and maintaining the balance of the valve system. The installation of the compensation valve system 100 and the vibration damper is simple and quick, improving assembly cycle time and further enhancing production line efficiency. The compact layout of the compensation valve system 100 can adapt to various vibration dampers, the dynamic sealing mechanism improves the accuracy of oil pressure response, simplifies component structure and assembly process, significantly reduces manufacturing costs, and meets the needs of large-scale production.

[0064] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0065] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0066] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0067] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0068] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0069] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0070] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.

[0071] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0072] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. An oil compensation structure, characterized in that, It includes a compensation valve system, a shock absorber body, and a recovery solenoid valve. One end of the compensation valve system is connected to the recovery solenoid valve, and the other end is connected to the shock absorber body. The compensation valve system includes a lower connecting ring, an upper connecting ring, a compensation spring, and a compensation valve block arranged coaxially. The lower connecting ring and the upper connecting ring are provided with through holes along the axial direction, and the upper connecting ring and the lower connecting ring are connected to form a cavity communicating with the through holes. The compensation spring and the compensation valve block are disposed in the cavity. One end of the lower connecting ring overlaps the side of the liquid reservoir of the damper body, and the other end passes through the connecting hole on the liquid reservoir and is sealed to the intermediate cylinder of the damper body. The lower connecting ring is also provided with a compensation hole. One end of the upper link ring is connected to the recovery solenoid valve, and the other end is sealed to the end of the lower link ring away from the intermediate cylinder. The center of the upper link ring extends axially toward the lower link ring to form a first connecting boss. One end of the compensation spring is interference-fitted to the outer edge of the first connecting boss, and the first connecting boss passes through the compensation spring axially. The other end of the compensation spring presses the compensation valve block against the lower connecting ring. Under the preload of the compensation spring, the compensation valve block normally seals and covers the compensation hole.

2. The oil compensation structure according to claim 1, characterized in that, The upper connecting ring and the recovery solenoid valve are provided with a first annular valve line on their connection end face, and the upper connecting ring and the recovery solenoid valve form a line seal fit through the first annular valve line.

3. The oil compensation structure according to claim 1, characterized in that, The side of the lower link ring that connects to the upper link ring extends axially toward the upper link ring to form an annular protrusion. The inner circumferential surface of the upper link ring and the outer circumferential surface of the annular protrusion are press-fitted to achieve a sealed connection between the lower link ring and the upper link ring.

4. The oil compensation structure according to claim 1, characterized in that, The lower connecting ring extends axially toward the intermediate cylinder on the side away from the upper connecting ring to form a second connecting boss. The intermediate cylinder is provided with a flange hole, and the second connecting boss is inserted into the flange hole.

5. The oil compensation structure according to claim 4, characterized in that, The outer peripheral surface of the second connecting boss is radially recessed to form a sealing groove. The sealing groove is coaxial with the lower connecting ring, and the sealing element is embedded in the sealing groove to achieve side sealing between the lower connecting ring and the flange hole.

6. The oil compensation structure according to claim 4, characterized in that, The inner wall of the flange hole is provided with a tapered guide surface, and the guide surface forms an assembly guide gap with the outer wall of the second connecting boss.

7. The oil compensation structure according to claim 1, characterized in that, The lower connecting ring and the compensation valve block are provided with a second annular valve line on their connecting end faces, and the lower connecting ring and the compensation valve block form a line seal fit through the second annular valve line.

8. The oil compensation structure according to claim 1, characterized in that, The compensation valve block is an annular valve plate with an inner diameter larger than the outer diameter of the first connecting boss. The first connecting boss passes through the central hole of the compensation valve block.

9. The oil compensation structure according to claim 1, characterized in that, The lower connecting ring is provided with a plurality of compensation holes evenly distributed circumferentially along its upper edge.

10. A vibration damper, characterized in that, Includes the oil compensation structure as described in any one of claims 1 to 9.

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