Oil compensation structure and shock absorber

Abstract

The invention provides an oil compensation structure and a shock absorber, the oil compensation structure comprises a compensation valve system, a shock absorber main body and a recovery solenoid valve, the recovery solenoid valve is communicated with a recovery cavity in the shock absorber main body through the compensation valve system, and the compensation valve system comprises an upper link ring, a lower link ring, a compensation spring and a compensation valve block; one end of the upper link ring is connected with the recovery electromagnetic valve and sealed through a valve line, the other end of the upper link ring and the lower link ring are sealed to form a cavity, the compensation valve block is arranged on the lower link ring, a first connecting boss is formed on one side of the upper link ring, and one end of the compensation spring is in interference sleeve connection with the first connecting boss. The other end of the compensation valve block presses the compensation valve block on the lower linking ring and seals the compensation hole, and the lower linking ring is connected with the middle cylinder through a second connecting boss; by means of the oil liquid compensation structure, the part structure and the installation mode of the compensation valve system are optimized, the stability of oil liquid sealing is improved, and the response speed is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of shock absorbers, and in particular relates to an oil compensation structure and a shock absorber. Background Art

[0002] Shock absorbers are key components in automotive suspension systems. They utilize fluid resistance or spring force to convert vibration energy into heat and dissipate it, thereby attenuating vibration and improving vehicle comfort, stability, and safety. Electronically controlled dual-valve shock absorbers utilize two solenoid valves to control the compression and return strokes, respectively. Compared to single-valve shock absorbers, these systems offer a wider damping force adjustment range. With the increasing demand for intelligent vehicle suspension systems, these systems are gaining widespread adoption.

[0003] Traditional electronically controlled dual-valve shock absorbers utilize only the piston valve, base valve, and solenoid valve for oil compensation, resulting in low oil replenishment efficiency. This makes it difficult to maintain dynamic balance in the valve train, accelerates valve wear, and reduces shock absorber life. Some improvements have increased compensation oil passages by adding a passive valve assembly below the solenoid valve, improving compensation efficiency. However, the passive valve assembly is complex and occupies a large space. Furthermore, in the linked valve structure, the compression stroke is insufficient, resulting in an unstable oil seal and prone to leakage, which can cause defects in the indicator diagram. Furthermore, these products face complex manufacturing and assembly processes, large space requirements, and high costs, making them unsuitable for mass production. Summary of the Invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide an oil compensation structure and shock absorber to solve the problems of complex assembly of the existing structure, difficulty in parts processing, large space occupation resulting in insufficient use stroke and unstable oil seal, etc. By optimizing the upper and lower link ring structures and the coordination between the valve block and the lower link ring, the damping control accuracy and reliability of the shock absorber are significantly improved, and at the same time, the compensation structure is simplified, the assembly process is simplified, the difficulty of parts processing and manufacturing costs are reduced, the assembly method is optimized, and the cost is effectively reduced.

[0005] To achieve the above-mentioned and other related objectives, the present invention provides an oil compensation structure, comprising a compensation valve system, a shock absorber body, and a return solenoid valve, wherein one end of the compensation valve system is connected to the return solenoid valve, and the other end is connected to the shock absorber body;

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

[0007] One end of the lower link ring is overlapped with the side of the liquid storage cylinder of the shock absorber body, and the other end passes through the connecting hole on the liquid storage cylinder and is sealedly connected to the middle cylinder of the shock absorber body. A compensation hole is also opened on the lower link ring;

[0008] One end of the upper link ring is connected to the restoration solenoid valve, and the other end is sealedly connected 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 on 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 onto the lower link ring. The compensation valve block normally seals and covers the compensation hole under the pre-tightening force of the compensation spring.

[0010] In an optional embodiment of the present invention, a first annular valve line is provided on the connecting end surface of the upper link ring and the restoration solenoid valve, and the upper link ring and the restoration solenoid valve form a line seal through the first annular valve line.

[0011] In an optional embodiment of the present invention, one side of the lower link ring connected to the upper link ring extends axially toward the upper link ring to form an annular protrusion, and the inner circumference of the upper link ring is interference fit with the outer circumference 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 the present invention, a second connecting boss is formed on the side of the lower connecting ring away from the upper connecting ring and extending axially toward the intermediate cylinder. A flanging hole is provided on the intermediate cylinder, and the second connecting boss is inserted into the flanging hole.

[0013] In an optional embodiment of the present invention, 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 a sealing member is embedded in the sealing groove to achieve side sealing between the lower connecting ring and the flanging hole.

[0014] In an optional embodiment of the present invention, the inner wall of the flanging hole is provided with a tapered guide surface, and the guide surface and the outer wall of the second connecting boss form an assembly guide gap.

[0015] In an optional embodiment of the present invention, a second annular valve line is provided on the connecting end surface of the lower link ring and the compensation valve block, and the lower link ring and the compensation valve block form a line seal through the second annular valve line.

[0016] In an optional embodiment of the present invention, the compensation valve block is an annular valve disc, the inner diameter of which is larger than the outer diameter of the first connecting boss, and the first connecting boss passes through the center hole of the compensation valve block.

[0017] In an optional embodiment of the present invention, a plurality of compensation holes are evenly arranged along the circumference of the lower link ring.

[0018] The present invention further provides a shock absorber comprising the oil compensation structure as described in any one of the above embodiments.

[0019] The technical effect of the present invention is that by performing oil compensation through the compensation valve system, it can be ensured that during the compression process of the dual-valve shock absorber, the oil is compensated to the recovery chamber of the piston more quickly, thereby ensuring the balance of the valve system and reducing damage to the valve system; through the coaxial integrated design of the upper link ring, compensation spring, compensation valve block and lower link ring, the integration of functions such as guiding, sealing and oil circuit control is realized, the structure of the upper and lower link rings is optimized, and the coordination between the valve block and the lower link ring is optimized. The oil compensation function can be realized without setting up a multi-stage passive valve assembly, the number of parts is reduced, the material and processing costs are reduced, the compensation structure is simplified, and the assembly process is simplified; at the same time, only a single-step press-fitting is required without multiple riveting, the assembly process is efficient, and the production line efficiency is improved; the structure of the upper and lower link rings is optimized, and the complexity is reduced. Structures such as steps and grooves are used, and standard annular valve line processing is used to achieve sealing, thereby improving processing efficiency; the dynamic sealing reliability of the annular valve line is high, the first connecting boss and the compensation spring are interference fit, and the guiding performance is good. The first boss passes through the compensation spring and the valve plate, and cooperates with the interference positioning of the lower link ring and the upper link ring to ensure the coaxiality of the parts and the uniform force of the valve block, and the sealing is reliable; the cross-sectional area of the through hole and the compensation hole is increased, which increases the oil compensation flow in the compression stroke and shortens the pressure balance time of the valve system; the preload force and stiffness of the compensation spring can match different working conditions, and realize precise control of the opening pressure of the compensation valve block. The compact axial layout provides the spring with a larger stroke and more flexible adjustment; the guide surface design of the flanging hole ensures assembly coaxiality and avoids spatial interference caused by misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

[0023] Figure 3 Schematic diagram of the structure of the lower link ring of the oil compensation structure in an optional embodiment of the present invention;

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

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

[0026] Figure 6 A schematic diagram of a partial structure of the connection between the compensation valve system, the shock absorber body and the restoration solenoid valve in an optional embodiment of the present invention;

[0027] Figure 7 A schematic diagram of the overall structure of a shock absorber in an optional embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the overall structure of the shock absorber from another perspective in an optional embodiment of the present invention.

[0029] Description of labels:

[0030] 100, compensation valve system; 200, shock absorber body; 300, recovery solenoid valve; 400, compression solenoid valve;

[0031] 110, upper link ring; 120, lower link ring; 130, compensation spring; 140, compensation valve block;

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

[0033] 121, compensation hole; 122, first connecting portion; 123, second connecting portion; 124, annular protrusion; 125, second annular valve line;

[0034] 210, liquid storage cylinder; 220, intermediate cylinder; 230, working cylinder; 240, piston valve; 250, bottom valve;

[0035] 211. Liquid storage chamber; 221. Flanged hole; 222. Upper section of the intermediate cylinder; 223. Connecting section of the intermediate cylinder; 224. Lower section of the intermediate cylinder; 225. Upper chamber of the intermediate cylinder; 226. Lower chamber of the intermediate cylinder; 231. Compression chamber; 232. Recovery chamber. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

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

[0038] Existing electronically controlled dual-valve shock absorbers generally suffer from low oil compensation efficiency, poor sealing reliability, and complex assembly processes. Traditional solutions rely on a serial oil replenishment mechanism between the solenoid valve and the piston valve, which results in delayed dynamic balance of the valve system and accelerated wear of the valve components. Some improved solutions increase the compensation oil passage by adding a passive compensation structure to enable the valve system to achieve balance faster, but these solutions also suffer from complex structures, large space requirements, insufficient stroke, and unstable sealing. Figure 1 This passive compensation structure requires riveting the clamping valve block 10, lower compensation valve block 20, lower link ring 30, and compensation spring 40 together using tooling during installation. Simultaneously, the upper link ring 50 must be press-fitted. This requires ensuring the coaxiality of the three components during press-fitting. This makes the manufacturing process difficult and complex, resulting in high manufacturing costs. Furthermore, assembly misalignment can lead to unstable oil seals, making it difficult to meet mass production requirements. The complex multi-stage design occupies axial space and limits the shock absorber's travel. Therefore, a simplified oil compensation solution with reliable sealing and adaptability for efficient assembly is urgently needed.

[0039] See also Figures 2 to 6The present invention provides an oil compensation structure, comprising a compensation valve system 100, a shock absorber body 200, and a restoring solenoid valve 300. One end of the compensation valve system 100 is connected to the restoring solenoid valve 300, and the other end is connected to the shock absorber body 200. The compensation valve system 100 comprises a coaxially arranged upper link ring 110, a lower link ring 120, a compensation spring 130, and a compensation valve block 140. A through hole is axially opened on the lower link ring 120 and the upper link ring 110. After the lower link ring 120 and the upper link ring 110 are pressed together, a cavity connected to the through hole is formed to realize the circulation of oil. One end of the lower link ring 120 is overlapped on the side of the liquid storage cylinder 210 of the shock absorber body 200 to facilitate the installation of the compensation valve system 100, and is sealed and connected to the upper link ring 110 to form a cavity, and the other end passes through the connecting hole on the liquid storage cylinder 210 and is sealed and connected to the intermediate cylinder 220; one end of the upper link ring 110 is connected to the lower link ring 120, and the other end is connected to the restoration solenoid valve 300, and the restoration solenoid valve 300 is connected to the internal chamber of the shock absorber through the link structure. The compensation spring 130 and the compensation valve block 140 are arranged in the cavity of the link ring, and cooperate to realize the opening or closing of the compensation oil circuit. The compensation spring 130 is connected with the upper link ring 110 and presses the compensation valve block 140 onto the lower link ring 120. The lower link ring 120 is provided with a compensation hole 121. Under the action of the pre-tightening force 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] See also Figures 2 to 6 In the recovery stroke of the shock absorber, the compensation valve block 140 is compressed by the compensation spring 130 to achieve the sealing of the compensation hole 121, ensuring that the pressure can be quickly built up in the recovery stage of the shock absorber, ensuring that the damping force of the shock absorber reaches the required value, and achieving the purpose of vibration reduction; in the compression stroke of the shock absorber, the oil pressure change is used in conjunction with the compensation spring 130 to lift the compensation valve block 140 and ensure that the compensation valve block 140 is evenly stressed, so that the compensation hole 121 is opened and connected with the cavity and the through hole on the link ring, opening the compensation oil circuit for efficient oil compensation. The overall structure is simple, the number of parts is small and easy to process. The structural integration can be achieved through the integrated press-fitting of the double link rings. The assembly process is simple, the cost is effectively reduced, and mass production is easy to achieve.

[0041] See also Figures 2 to 6Specifically, in the shock absorber body 200, a liquid storage chamber 211 is formed between the liquid storage cylinder 210 and the intermediate cylinder 220, and an intermediate cylinder upper chamber 225 and an intermediate cylinder lower chamber 226 are respectively formed between the intermediate cylinder 220 and the working cylinder 230. The working cylinder 230 is separated into two sides by a piston valve 240 to form a compression chamber 231 and a restoration chamber 232, respectively. The intermediate cylinder upper chamber 225 is connected to the restoration chamber 232, and the intermediate cylinder lower chamber 226 is connected to the compression chamber 231; a connecting hole is opened on the liquid storage cylinder 210 for installing the solenoid valve, the restoration solenoid valve 300 is installed on one side of the restoration chamber 232 and is connected to the restoration chamber 232 through the compensation valve system 100, and 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 link ring.

[0042] During the compression stroke of the shock absorber, the oil pressure on the compression chamber 231 side of the piston valve 240 continues to increase. Part of the oil flows into the liquid storage chamber 211 of the reservoir cylinder 210 and the intermediate cylinder 220 and the recovery chamber 232 on one side of the piston valve 240 through the bottom valve 250 and the channel in the piston valve 240. The other part enters the lower chamber 226 of the intermediate cylinder through the through hole on the working cylinder 230, and then flows into the liquid storage chamber 211 between the oil reservoir cylinder and the intermediate cylinder 220 through the compression solenoid valve 400 at the lower end. During the compression process, the piston valve 240 moves toward the side of the bottom valve 250, and the oil in the lower chamber 226 of the intermediate cylinder continues to increase and flows into the liquid storage chamber 211, thereby pushing open the compensation valve block 140 on the compensation hole 121. The oil enters the cavity of the link ring through the compensation hole 121 and quickly flows out through the through hole and enters the upper chamber 225 of the intermediate cylinder, and further compensates to the recovery chamber 232 to achieve oil compensation.

[0043] See also Figures 2 to 6In an optional embodiment of the present invention, one end of the upper link ring 110 is connected to the restoration solenoid valve 300, and the other end is sealed with the end of the lower link ring 120 away from the intermediate cylinder 220. The compensation spring 130 is coaxially matched with the upper link ring 110, and a first connecting boss 111 is formed at the center of the upper link ring 110, extending axially toward the lower link ring 120. One end of the compensation spring 130 is interference-fitted into the outer edge of the first connecting boss 111 to achieve positioning. The first connecting boss 111 axially penetrates the compensation spring 130 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 surface of the lower link ring 120, and the compensation valve block 140 normally seals and covers the compensation hole 121 under the action of the pre-tightening force of the compensation spring 130. During the assembly process, it is only necessary to press the upper link ring 110 and the lower link ring 120 together, and use the inner diameter of the first connecting boss 111 inside the upper link ring 110 to guide the installation of the compensation spring 130, and ensure coaxial installation through interference nesting. The first connecting boss 111 axially passes through the compensation spring 130, which increases the guide length and ensures reliable assembly. The compensation spring 130 is then used to press the compensation valve block 140 onto the lower link ring 120 to achieve coaxial matching between the compensation valve block 140 and the lower link ring 120. Only one-step pressing is required, the installation process is simpler, easy to operate, and less prone to assembly offset, ensuring that the compensation valve block 140 is evenly stressed and can ensure better sealing.

[0044] See also Figures 2 to 6 In an optional embodiment of the present invention, a first annular valve line 112 is provided on the connecting end surface between the upper link ring 110 and the restoration solenoid valve 300. The upper link ring 110 and the restoration solenoid valve 300 form a line seal at the contact surface via the first annular valve line 112. This line contact seal replaces the traditional flat seal, facilitating installation. It reduces the contact area to increase unit pressure, reduces seal surface wear, enhances seal reliability, and reduces leakage risk. It eliminates the need for additional sealing groove machining, simplifies the component structure and assembly process, and simultaneously avoids localized leakage caused by assembly deviation, ensuring stable oil pressure in the restoration chamber 232 and improving damping force response speed. In other embodiments, a sealing groove may be formed by axially recessing the connecting surface between the upper link ring 110 and the restoration solenoid valve 300. A sealing member, such as an O-ring, is embedded in the sealing groove. During installation, the O-ring is compressed to achieve a sealed connection between the upper link ring 110 and the restoration solenoid valve 300.

[0045] See also Figures 2 to 6In an optional embodiment of the present invention, the upper link ring 110 is annular in shape, comprising a top wall for connecting to the reset solenoid valve 300 and a side wall for connecting to the lower link ring 120. A first connecting boss 111 is formed in the center of the top wall, with a through hole formed in the center of the first connecting boss 111, communicating with the cavity. The side wall is sleeved onto the lower link ring 120, achieving a seal through an interference fit. The first connecting boss 111 guides and connects to the compensation spring 130, enabling oil flow through the through hole. The overall structure is simple, facilitating machining and assembly, reducing costs, and reducing the overall thickness of the components, thereby leaving more space to compensate for deformation of the spring 130.

[0046] See also Figures 2 to 6 In an optional embodiment of the present invention, the lower link ring 120 includes a first connecting portion 122 and a second connecting portion 123. The first connecting portion 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 is sealed and connected to the upper link ring 110 to form a cavity. The first connecting portion 122 extends axially toward the middle cylinder 220 on one side away from the upper link ring 110 to form a second connecting boss, namely the second connecting portion 123, which is used to cooperate with the middle cylinder 220 for connection. The lower link ring 120 is connected to the upper chamber 225 of the middle cylinder below through the center through hole; a compensation hole 121 is also provided on the lower link ring 120, and the oil storage chamber and the upper chamber 225 of the middle cylinder can be connected through the compensation hole 121 and the through hole to form a compensation oil circuit.

[0047] See also Figures 2 to 6 In an optional embodiment of the present invention, one side of the lower link ring 120 connected to the upper link ring 110 extends axially toward the upper link ring 110 to form an annular protrusion 124. The inner circumference of the upper link ring 110 and the outer circumference of the annular protrusion 124 are interference-fitted to achieve a sealed connection between the lower link ring 120 and the upper link ring 110. Specifically, the upper link ring 110 is press-fitted axially onto the lower link ring 120, achieving axial positioning and cavity sealing through a radial interference fit without the need for additional sealing components. The interference fit between the annular protrusion 124 and the inner wall of the upper link ring 110 achieves self-centering, ensuring the coaxiality of the compensation spring 130, the compensation valve block 140, and the lower link ring 120, preventing uneven force on the valve block from causing eccentric wear or sealing failure, and simplifying the assembly and positioning process. The annular protrusion 124 provides radial limiting, preventing the link ring from shifting during the press-fit process, ensuring precise alignment, and enhancing the torsional strength of the connection structure. The annular protrusion 124 is integrated on the lower link ring 120 , and the inner diameter of the upper link ring 110 only needs to match the outer diameter of the annular protrusion 124 . The part structure is simple, the processing is convenient, and the processing cost is effectively reduced.

[0048] Specifically, the first connecting part 122 is an annular structure, and a stepped plane is processed 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 plugged 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 link ring 120, while reducing the structural redundancy between the intermediate cylinder 220 and the oil storage cylinder, and optimizing the overall space utilization; an annular protrusion 124 is formed on the other side of the first connecting part 122, and the inner diameter of the inner wall of the upper link ring 110 is smaller than the outer diameter of the annular protrusion 124. The two are tightened by side interference fit to achieve a stable sealing connection, and the lower end face of the upper link ring 110 abuts the end face of the lower link ring 120, and the upper link ring 110 and the lower link ring 120 are pressed into an integrated structure.

[0049] See also Figures 2 to 6 In an optional embodiment of the present invention, multiple compensation holes 121 are evenly arranged along the circumference of the lower link ring 120. The inner sides of the compensation holes 121 are connected to the cavity. Under normal conditions, the orifices are covered by the compensation valve block 140 to achieve a good seal, ensuring that the shock absorber can quickly build pressure during the recovery phase to achieve vibration reduction. During the shock absorber compression stroke, the compensation holes 121 are opened. Through the cooperation of the multiple compensation holes 121 and the through hole, the oil can be quickly compensated to the recovery chamber 232, ensuring the balance of the valve system and reducing damage to the valve system. The compensation holes 121 can be configured as elongated holes, for example, 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 disc. The hole diameter or number can be adjusted according to the working conditions to flexibly match different damping force characteristics.

[0050] See also Figures 2 to 6 In an optional embodiment of the present invention, a second annular valve line 125 is provided on the connecting end surface between the lower link ring 120 and the compensation valve block 140. The second annular valve line 125 is positioned on either side of the compensation hole 121. The connection between the lower link ring 120 and the compensation valve block 140 forms a line seal through the second annular valve line 125, ensuring a good seal in the compensation circuit under normal conditions and preventing oil leakage during compensation. This also allows for rapid opening of the compensation valve block 140 during the shock absorber's compression stroke to achieve the desired flow. After the compensation valve block 140 is attached to the lower link ring 120, its upper end surface is compressed by the compensation spring 130, allowing its bottom surface to rest against the second annular valve line 125 on the inner end surface of the lower link ring 120. This seal is achieved through the compression of the valve line.

[0051] See also Figures 2 to 6In an optional embodiment of the present invention, the compensating valve block 140 can utilize an annular valve disc. This disc evenly conforms to the valve line under spring pressure, preventing deformation and failure due to single-point stress concentration. No additional grooves or bosses are required on the disc, achieving a good seal while simplifying the structure and occupying less space. This provides more space for the deformation of the compensating spring 130, and the overall coordination of the compensating spring 130, compensating valve block 140, and valve line achieves rapid sealing and facilitates installation. A second annular valve line 125 is mounted on the lower link ring 120, forming a dynamic linear seal with the compensating valve block 140. During the compression stroke, oil pressure pushes the valve block away from the valve line, and the compensating oil flows through the compensation hole 121 into the recovery chamber 232. During the recovery stroke, the spring preload forces the valve block to reset and seal, preventing oil backflow. This dynamic sealing mechanism balances sealing reliability with compensation response speed.

[0052] It is understood that the coordinated design of the annular valve disc and valve line sealing structure, combined with the axially compact layout of the upper and lower link rings 120, effectively reduces the occupied space, provides a larger effective stroke for the compensation spring 130, and provides a physical basis for the multi-level adjustment of the valve block opening force. It can be used to realize the function of opening the valve block to compensate for the oil at a variety of optional force values, providing a larger adjustable space. By adjusting the preload force and stiffness coefficient of the compensation spring 130, the opening pressure of the compensation valve block 140 can be adjusted. On the one hand, through the dynamic matching of the spring stiffness and the oil pressure, the noise generated by the high-frequency opening and closing of the valve disc is eliminated. On the other hand, the increased stroke space improves the linearity of the valve block motion trajectory, shortens the opening response time, and avoids the valve disc chatter caused by insufficient stroke, thereby significantly improving the damping force adjustment accuracy and system stability.

[0053] See also Figures 2 to 6In an optional embodiment of the present invention, one end of the compensation spring 130 abuts against the inner end surface of the upper link ring 110 and is interference-fitted with the first connecting boss 111, and the other end abuts against the end surface of the valve block to press it against the inner end surface of the lower link ring 120. The first connecting boss 111 passes through the compensation spring 130 to ensure good guidance during assembly. After the compensation valve block 140 is pushed open, the compensation spring 130 is not easy to slip when compressed, thereby ensuring the stability of the oil compensation process; the inner diameter of the compensation valve block 140 is larger than the outer diameter of the first connecting boss 111, and the first connecting boss 111 can pass through the center hole of the compensation valve block 140. The clearance between the compensation valve block 140 and the link ring is matched to limit the radial deviation of the valve disc, thereby ensuring the dynamic stability of the valve disc and ensuring sealing. The surfaces are always aligned, which extends the service life of the valve plate. The through holes in the centers of the upper link ring 110, the lower link ring 120 and the compensation valve block 140 are connected for the circulation of oil; the compensation spring 130 and the first connecting boss 111 are interference fit with the upper link ring 110 to achieve coaxial cooperation with the compensation valve block 140. The compensation valve block 140 is placed on the lower link ring 120 and coaxially cooperates with it. When the upper link ring 110 and the lower link ring 120 are press-fitted, the compensation spring 130 presses the compensation valve block 140 so that it is tightly connected with the inner end face of the lower link ring 120 to achieve sealing. One-step press-fitting can ensure good coaxiality between the upper link ring 110, the lower link ring 120, the compensation spring 130 and the compensation valve block 140. The assembly is simple, which can effectively ensure the qualified rate of the product and facilitate quantitative production.

[0054] It can be understood that after the upper link ring 110 and the lower link ring 120 are pressed together, the distance between the inner end face of the upper link 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 press the compensation valve block 140 to seal the compensation hole 121 inside the cavity through the spring.

[0055] See also Figures 2 to 6In an optional embodiment of the present invention, the second connecting portion 123, or the second connecting boss, passes through the connecting hole in the liquid reservoir 210 and is sealedly connected to the intermediate cylinder 220. The through hole in the center of the lower link ring 120 can communicate with the lower chamber 226 of the intermediate cylinder. Oil entering the cavity through the compensation hole 121 will pass through the through hole into the lower chamber 226 of the intermediate cylinder and further into the recovery chamber 232, achieving oil compensation. The intermediate cylinder 220 is provided with a flange hole 221. Installation is achieved by inserting the second connecting boss into the flange hole 221 and sealing the connection. The flange hole 221 provides radial support, limits the circumferential displacement of the lower link ring 120, ensures precise alignment between the through hole and the upper chamber 225 of the intermediate cylinder, and optimizes the smoothness of the oil compensation path. The plug-in installation simplifies the assembly process of the intermediate cylinder 220 and the compensation structure, reducing the processing precision requirements. The compensation structure is overlapped on the step surface of the oil storage cylinder through the first connecting part 122. During assembly, it is only necessary to press the lower link ring 120 into the flange hole 221 of the intermediate cylinder 220. This facilitates installation and observation of the correctness of the installation, improves the assembly cycle, and further improves the production line efficiency.

[0056] See also Figures 2 to 6 In an optional embodiment of the present invention, the second connecting portion 123 is inserted into the flanged hole 221 of the intermediate cylinder 220 and is sealed from the side. Specifically, the outer peripheral surface of the second connecting portion 123 is radially recessed to form a sealing groove. The sealing groove is coaxial with the lower link ring 120, and a sealing member is embedded in the sealing groove to achieve a seal between the lower link ring 120 and the flanged hole 221. Specifically, the sealing groove can be, for example, a U-shaped groove, and the sealing member, such as an O-ring, is assembled in the sealing groove. The O-ring forms a radial extrusion seal with the inner wall of the flanged hole 221, adapting to oil pressure fluctuations, preventing compensation oil from leaking from the connection gap, and ensuring the stability of the oil circuit. The independent seal is easy to replace, reducing maintenance costs. In other embodiments, the outer peripheral surface of the second connecting portion 123 can also be subjected to a rubber vulcanization treatment. The vulcanized rubber is then press-fitted with the intermediate cylinder 220 to achieve the purpose of sealing. This simplifies processing and improves sealing reliability and environmental adaptability.

[0057] See also Figures 2 to 6 In an optional embodiment of the present invention, the inner wall of the flange hole 221 is also provided with a tapered guide surface, and 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-axis misalignment during assembly, thereby improving assembly efficiency and yield.

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

[0059] See also Figures 2 to 6 In an optional embodiment of the present invention, during installation, the compensation spring 130 is first coaxially matched with the borrowing and returning 110 and interference-fitted on the first connecting boss 111, so that the good coaxiality of the two can be ensured during the installation process; the compensation valve block 140 is set on the lower link ring 120, and the compensation valve block 140 is coaxially matched with the lower link ring 120 and placed on the lower link ring 120, and then the upper link ring 110 is axially pressed together with the lower link ring 120. At this time, the internal compensation spring 130 and the compensation The valve block 140 is pressed together, and the compensation spring 130 compresses the compensation valve block 140 and the lower connecting ring 120 to cover the sealing compensation hole 121. The entire installation of the compensation valve system 100 is completed. The small interference fit between the compensation spring 130 and the first connecting boss 111, as well as the interference fit between the upper connecting ring 110 and the lower connecting ring 120, can provide good coaxiality, ensuring that the compensation valve block 140 can obtain 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 qualified rate is higher. It ensures that during the dual-valve shock absorber process, the oil can be compensated to the recovery chamber of the piston more quickly, 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 part structure and assembly process. The compensation spring 130 is directly pre-loaded to achieve a normally closed seal. During the compression stroke, the oil pressure can push open the compensation valve block 140 to achieve rapid oil replenishment, significantly improving the dynamic balance capability of the valve system.

[0060] See also Figures 2 to 6In an optional embodiment of the present invention, the compensation valve system 100 is installed between the intermediate cylinder 220 and the restoration solenoid valve 300 to form an oil compensation structure, which can perform efficient oil compensation during the shock absorber compression stroke and quickly achieve the balance of the valve system. This structure simplifies the compensation flow channel through a coaxial design, realizes structural integration through the integral press-fitting of a double-link ring, and ensures coaxiality and sealing reliability by using a boss guide and a valve line seal; utilizes the preload force of the compensation spring 130 to realize dynamic sealing, realizes stable oil sealing, ensures that the oil pressure is quickly established in the recovery phase, and in the compression phase, the oil can push the valve block to quickly compensate to the recovery chamber 232; by optimizing the structure of components, the oil flow area is increased, the space occupied is reduced, thereby improving the stroke of the compensation spring 130, providing a larger adjustable space, and optimizing the dynamic compensation performance of the oil; the structural design of the compensation valve system 100 reduces the number of parts, reduces the difficulty of processing, and realizes low-cost, high-reliability oil balance; the single-step press-fitting process significantly reduces the complexity of assembly, the component structure is simple and easy to assemble, which can improve the product qualification rate during assembly and can well adapt to mass production needs; the overall structure is simple, and is easy to integrate and lightweight design.

[0061] See also Figures 2 to 8 The present invention also proposes a shock absorber, which includes an oil compensation structure as described in any one of the above embodiments. Specifically, the shock absorber includes a compensation valve system 100, a shock absorber body 200, a restoration solenoid valve 300 and a compression solenoid valve 400. The shock absorber body 200 includes a liquid storage cylinder 210, an intermediate cylinder 220, a working cylinder 230 and a piston valve 240. A liquid storage chamber 211 is formed between the liquid storage cylinder 210 and the intermediate cylinder 220; the intermediate cylinder 220 includes an intermediate cylinder upper section 222, an intermediate cylinder connecting section 223 and an intermediate cylinder lower section 224. After the intermediate cylinder upper section 222, the intermediate cylinder connecting section 223 and the intermediate cylinder lower section 224 are pressed together, they are further pressed together with the working cylinder 230. The sealing is ensured by a sealing member such as an O-ring, and an intermediate cylinder upper chamber 225 and an intermediate cylinder lower chamber 226 that are isolated from each other are formed between the intermediate cylinder 220 and the working cylinder 230. The plug valve 240 is arranged in the working cylinder 230, and a compression chamber 231 and a restoration chamber 232 are formed on both sides respectively, wherein the compression chamber 231 is the side close to the bottom valve 250, the upper chamber 225 of the intermediate cylinder is connected to the restoration chamber 232, and the lower chamber 226 of the intermediate cylinder is connected to the compression chamber 231; a connecting hole is opened on the oil storage cylinder to facilitate the installation of the link ring and the solenoid valve, and the restoration solenoid valve 300 is connected to the restoration chamber 232 through the compensation valve system 100. The compensation valve system 100 includes an upper link ring 110, a lower link ring 120, a compensation valve block 140 and a compensation spring 130, and the compression solenoid valve 400 is connected to the compression chamber 231 through the link ring.

[0062] During the recovery stroke of the shock absorber, the piston valve 240 moves to the side away from the bottom valve 250. At this time, the compensation spring 130 presses the valve plate to close the compensation hole 121 to ensure good sealing. The oil flows through the solenoid valve control channel to quickly build up the damping pressure, ensuring that the damping force of the shock absorber reaches the required value to achieve vibration reduction. The damping force can be adjusted by adjusting the solenoid valve; during the compression stroke of the shock absorber, the piston valve 240 moves to the side close to the bottom valve 250. At this time, the oil pressure on the compression chamber 231 side of the piston valve 240 continues to increase, and part of the oil passes through the bottom valve The oil flows through the paths on 250 and piston valve 240 into reservoir chamber 211 and recovery chamber 232, respectively. The remaining portion enters lower chamber 226 of the intermediate cylinder and then flows into reservoir chamber 211 through the compression solenoid valve 400 on this side. During the compression process, the oil pressure continuously increases, overcoming the spring preload force and pushing the valve plate open. After the compensation hole 121 opens, the oil enters the cavity and rapidly flows through the through-hole of the lower link ring 120 into upper chamber 225 of the intermediate cylinder, further compensating to recovery chamber 232, shortening the pressure balance time. At the end of the stroke, the spring returns, causing the valve plate to reseal the compensation hole 121. The simplified coaxial valve system and dynamic seal design achieve efficient oil compensation, reduce valve system pressure fluctuations, and simultaneously reduce valve system impact noise, effectively extending the life of the solenoid valve.

[0063] In summary, in the oil compensation structure and shock absorber of the present invention, by optimizing the structure of the compensation valve system 100, the parts structure is simple, easy to process and assemble, and the sealing is reliable. At the same time, it can provide a larger adjustable space, realize flexible adjustment of the structure to improve response and eliminate noise; the overall functionality of the compensation valve system 100 is strong, and it can achieve rapid oil compensation during the compression stroke of the shock absorber to maintain the balance of the valve system. The installation of the compensation valve system 100 and the shock absorber is simple and fast, which improves the assembly cycle and further improves the production line efficiency; the compact layout of the compensation valve system 100 can be adapted to a variety of shock absorbers, and the dynamic sealing mechanism improves the oil pressure response accuracy, simplifies the parts 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 the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

[0065] In the description herein, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the 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 the specific details or with other devices, systems, assemblies, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0066] Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the invention may 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 invention described and illustrated herein are possible in light of the teachings herein and are considered part of the spirit and scope of the invention.

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

[0068] In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only and not limiting. Furthermore, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or." Where a term is unclear in providing separation or combination capabilities, the combination of components or steps will also be considered as indicated.

[0069] As used in the description herein and throughout the claims that follow, “a,” “an,” and “the” include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless otherwise indicated.

[0070] The above description of the illustrated embodiments of the present invention (including that described in the Abstract) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, as those skilled in the art will recognize and appreciate, various equivalent modifications are possible within the spirit and scope of the present invention. As noted, modifications may be made to the present invention in light of the above description of the illustrated embodiments of the present invention, and such modifications will be within the spirit and scope of the present invention.

[0071] Systems and methods have been generally described herein in detail to facilitate understanding of the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of these specific details, or with other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

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

Claims

1. An oil compensation structure, characterized in that: The compensating valve system comprises a shock absorber body and a restoring solenoid valve, wherein one end of the compensating valve system is connected to the restoring solenoid valve, and the other end is connected to the shock absorber body; The compensation valve system includes a coaxially arranged lower link ring, an upper link ring, a compensation spring, and a compensation valve block. The lower link ring and the upper link ring are axially provided with through holes, and the upper link ring and the lower link ring are connected to form a cavity communicating with the through holes. The compensation spring and the compensation valve block are arranged in the cavity. One end of the lower link ring is overlapped with the side of the liquid storage cylinder of the shock absorber body, and the other end passes through the connecting hole on the liquid storage cylinder and is sealedly connected to the middle cylinder of the shock absorber body. A compensation hole is also opened on the lower link ring; One end of the upper link ring is connected to the restoration solenoid valve, and the other end is sealedly connected 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 on 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 onto the lower link ring. The compensation valve block normally seals and covers the compensation hole under the pre-tightening force of the compensation spring.

2. The oil compensation structure according to claim 1, characterized in that: A first annular valve line is provided on the connecting end surface of the upper link ring and the restoration solenoid valve, and the upper link ring and the restoration solenoid valve form a line sealing fit through the first annular valve line.

3. The oil compensation structure according to claim 1, characterized in that: One side of the lower link ring connected to the upper link ring extends axially toward the upper link ring to form an annular protrusion, and the inner circumference of the upper link ring is interference-fitted with the outer circumference of the annular protrusion 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: A second connecting boss is formed on one side of the lower connecting ring away from the upper connecting ring and extending axially toward the middle cylinder. A flanging hole is provided on the middle cylinder, and the second connecting boss is inserted into the flanging 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, which is coaxial with the lower connecting ring. A sealing member is embedded in the sealing groove to achieve side sealing between the lower connecting ring and the flanging hole.

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

7. The oil compensation structure according to claim 1, characterized in that: A second annular valve line is provided on the connecting end surface of the lower link ring and the compensation valve block, and the lower link ring and the compensation valve block form a line sealing 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 disc, the inner diameter of which is larger than the outer diameter of the first connecting boss, and 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: A plurality of compensation holes are evenly arranged on the lower link ring along the circumferential direction.

10. A shock absorber, characterized in that: The invention comprises the oil compensation structure according to any one of claims 1 to 9.

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