Frequency self-adaptive damper valve assembly and shock absorber using valve assembly

Abstract

The present invention provides a frequency self-adaptive damper valve assembly and a shock absorber using the valve assembly. The frequency self-adaptive damper valve assembly comprises a housing, a valve member, a flexible annular sealing element, a variable volume pressure chamber; one side of the variable volume pressure chamber is defined by the flexible annular sealing element; the valve member has a support portion which has a first engagement surface sealingly engaged with an upper end face of the sealing element, and a second engagement surface sealingly engaged with a lower end face of the sealing element; the sealing element is mounted on the support portion by means of the first engagement surface and the second engagement surface. According to the present invention, the lower end face of the sealing element is arranged in a suspended mode and does not come into contact with other parts below the sealing element, so that a non-linear increase of the load in a pressure establishing process is avoided, moreover, friction with the housing is avoided, the parts are prevented from being damaged, and the stability and durability are improved.

Description

Frequency adaptive damping valve assembly and shock absorber using the same Technical Field

[0001] The present invention relates to a frequency adaptive damping valve component and a shock absorber using the valve component, which can be applied to various technical fields such as automobiles and machinery. Background Art

[0002] Dampers, or shock absorbers, are critical components of a vehicle's chassis and driving system. They connect the vehicle's sprung and unsprung masses and attenuate road-induced vibrations through damping force design, thereby improving driving and riding comfort. The FAD damping system features a frequency-adaptive damping valve system. It adapts to varying road excitation frequencies to achieve varying damping characteristics, decomposing the sprung and unsprung frequencies to significantly enhance vehicle driving comfort. Patent publication number CN108012552B discloses a frequency-selective damping valve. The damping valve has the following defects: (1) The installation spring connects the supporting flexible plate and the sealing element, which provides a certain auxiliary effect on the establishment of the damping force. However, the installation spring has a nonlinear increase in load during the compression process, and there is a certain permanent compression deformation, which has a certain impact on the stability of the damping force; in addition, when the installation spring is compressed and deformed, it will rub against the shell, causing abnormal noise and component damage, and will also produce powder due to friction, affecting flow cleanliness and even blocking leakage; (2) The spacer element affects the damping force and adjustment range. The spacer element is connected to the bias spring and the second flexible wall combination. The spacer element's through-hole design and material stiffness affect the valve system preload. If the material is a flexible material, the damping force stability changes due to the change in the through-hole area during the compression process of the spacer element. If the material It is a rigid material, the valve system stiffness increases, the high-frequency damping force range decreases, which is not conducive to the high-frequency damping force adjustment; (3) the control channel for the fluid to flow into the valve body is formed by the gap between the second movable valve body part and the valve plate unit and the first movable valve body part, the flow channel cross-section and flow are difficult to control, the control accuracy is low, and because there is a gap between the second movable valve body part and the valve plate unit and the first movable valve body part, the three components are prone to wear during operation, further reducing the control accuracy and stability; in addition, the control channel is formed by the second movable valve body part, the valve plate unit and the first movable valve body part. There are many components, which easily form tolerance accumulation, further making the fluid cross-sectional area and flow control accuracy of the control channel low, affecting the pressure and damping establishment. Summary of the Invention

[0003] An object of the present invention is to provide a frequency adaptive damping valve assembly and a shock absorber using the valve assembly.

[0004] To achieve the above objectives, the present invention provides a frequency adaptive damping valve assembly, comprising:

[0005] a housing having an inlet port adapted for fluid connection to the first pressure chamber and an outlet port adapted for fluid connection to the second pressure chamber;

[0006] a valve member biased against a first pressure chamber outlet edge and arranged to allow fluid to flow from the inlet port to the outlet port directly via an open gap between the outlet edge and the valve member when the pressure in the first pressure chamber exceeds a certain opening pressure;

[0007] The second pressure chamber is a variable volume pressure chamber, which is fluidically connected to the first pressure chamber via a fluid inflow channel and fluidically connected to the outlet port via a fluid outflow channel;

[0008] The second pressure chamber is delimited by a flexible annular sealing element on a side facing the first pressure chamber, and the valve member has a supporting portion that penetrates the sealing element and is supported on a supporting structure in the second pressure chamber;

[0009] The support portion has a first engaging surface that is sealingly engaged with the upper end face of the sealing element, and a second engaging surface that is sealingly engaged with the lower end face of the sealing element. The sealing element is mounted on the support portion by the first engaging surface and the second engaging surface so as to bias the valve member toward the first pressure chamber using a force that depends on the pressure in the second pressure chamber.

[0010] As an embodiment, the inner diameter of the sealing element is smaller than the outer diameter of the supporting portion that cooperates with the inner hole of the sealing element, and the outer diameter of the sealing element is larger than the inner diameter of the housing that seals with the sealing element.

[0011] As an embodiment, a convex bulge extends downward from the edge of the lower end surface of the sealing element.

[0012] As an embodiment, the second pressure chamber is defined by a supporting valve plate unit on a side facing the bottom of the housing.

[0013] As an embodiment, the valve component includes a valve upper seat and a valve lower seat; a normally through hole is formed on the valve upper seat body as a first fluid inflow channel; a normally through hole is formed on the valve lower seat body as a second fluid inflow channel; the first fluid inflow channel and the second fluid inflow channel constitute part of the fluid inflow channel; the cross-sectional area of ​​the second fluid inflow channel is smaller than the cross-sectional area of ​​the first fluid inflow channel.

[0014] As an embodiment, the body of the valve upper seat extends downward to form a buffer cavity forming portion; a buffer cavity is formed inside the buffer cavity forming portion; the buffer cavity is located between the first fluid inflow channel and the second fluid inflow channel, and is fluidically connected to each other.

[0015] As an embodiment, the buffer cavity forming portion is in sealing cooperation with the valve lower seat, and the valve lower seat is in sealing and slidable cooperation with the inner wall of the shell through the sealing element.

[0016] As an embodiment, the bottom of the buffer cavity is an open structure, the open edge of the buffer cavity forming portion is placed on the body of the valve lower seat, and a seal is provided between the open edge and the valve lower seat body.

[0017] As an embodiment, the valve component also includes a mounting valve plate, and the supporting portion is provided with a boss on the side facing the first pressure chamber, the mounting valve plate is mounted on the boss, at least a portion of the upper end surface of the mounting valve plate is against the valve component body, and the lower end surface of the mounting valve plate and the boss end surface jointly serve as the first bonding surface and are sealingly bonded to the sealing element.

[0018] As an embodiment, a limit support portion is provided on the side wall of the shell, and the upper end surface of the mounting valve plate is abutted against the limit support portion.

[0019] As an embodiment, the end surface of the position-limiting support portion that cooperates with the mounting valve plate is a planar structure, and the side of the position-limiting support portion facing the internal space of the shell is set as an R-angle structure.

[0020] As an embodiment, the position-limiting support portion is provided on the end surface of the portion of the upper shell extending into the lower shell.

[0021] As an embodiment, a regular through hole serving as a fluid outflow channel is further provided on the valve lower seat body; the inlet of the fluid outflow channel is fluidically connected to the pressure chamber, and the outlet of the fluid outflow channel is fluidically connected to the outlet port via a fluid flow channel.

[0022] As an embodiment, the valve lower seat is formed with an installation space adapted to the buffer cavity forming part for placing the buffer cavity forming part; the open edge of the buffer cavity forming part is arranged on the body of the valve lower seat; and a leakage gap is formed between the outer wall of the buffer cavity forming part and the valve lower seat.

[0023] As an embodiment, the outlet of the fluid outflow channel is in fluid communication with the leakage gap, and the leakage gap is in fluid communication with the outlet port via a fluid flow channel.

[0024] As an embodiment, a pressure relief chamber is formed between the valve upper seat, the valve lower seat, the mounting valve plate and the inner wall of the shell, and the pressure relief chamber leads to the outside of the valve assembly shell through the outlet port; the leakage gap extends from the gap between the valve lower seat and the valve upper seat to the pressure relief chamber and is fluidically connected.

[0025] As an embodiment, a sealing elastic valve plate is provided between the buffer cavity forming portion and the valve lower seat to form a sealing fit; the outlet of the fluid outflow channel is located outside the edge of the sealing elastic valve plate.

[0026] As an embodiment, a sealing elastic valve plate is arranged between the buffer cavity forming portion and the valve lower seat to form a sealing fit; the outlet of the fluid outflow channel is located on the inner side of the edge of the sealing elastic valve plate, and a leakage valve plate is arranged at the outlet of the fluid outflow channel to fluidically connect the leakage gap.

[0027] As an embodiment, the discharge valve plate is a throttle valve plate.

[0028] As an embodiment, a notch or a gap is provided on the discharge valve plate, and the discharge valve plate is located between the outlet of the fluid outflow channel and the sealing elastic valve plate, and the fluid flows into the discharge gap through the notch or the gap.

[0029] As an embodiment, the valve component also includes a supporting valve plate unit and a supporting seal; the supporting valve plate unit is arranged at the bottom of the shell, and the supporting seal is placed on the supporting valve plate unit. The supporting valve plate unit is sealed with the inner wall of the shell through the supporting seal, and the supporting structure and the supporting seal can move along the inner wall of the shell; the supporting structure is arranged on the supporting seal, and the valve lower seat is arranged on the supporting structure.

[0030] As an embodiment, the supporting structure is a spring sheet, and the spring sheet is provided with a connecting hole connecting the upper and lower sides, and the spaces on the upper and lower sides of the spring sheet are connected through the connecting hole.

[0031] The present invention further provides a shock absorber comprising any one of the aforementioned frequency adaptive damping valve assemblies, wherein a fluid inlet channel in the shock absorber piston rod is in fluid communication with an inlet port of the first pressure chamber.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) In the present invention, the sealing element is mounted in a position-limited manner by the support portion of the valve member. In particular, the lower end surface of the sealing element is supported by the second engagement surface of the support portion. This allows the sealing element to be suspended in the air and not in contact with other components below it. This installation method also simplifies the structure and eliminates the mounting spring that supports the sealing element in the prior art, thereby avoiding a nonlinear increase in load during pressure buildup and preventing friction with the housing, thereby preventing component damage and improving stability and durability.

[0034] (2) The fluid inflow channel is formed by the regular through holes on the upper and lower valve seats, which does not require the coordination of multiple parts and will not accumulate tolerances. At the same time, the regular through holes facilitate the precise control of the cross-sectional area and flow rate of the fluid inflow, thereby improving the control accuracy and stability of the damping.

[0035] (3) In the prior art, the side gap of the valve stem forms a flow channel, and its flow cross-sectional area is difficult to control accurately and is limited. However, the present invention forms a fluid flow channel on the valve seat in the form of a regular through hole, and the flow cross-sectional area can be adjusted within a wide range, and the setting and control are highly precise, further improving the damping stability and controllability.

[0036] (4) A buffer chamber is provided in the fluid inflow channel. When the fluid flows in and pressure is built up, the pressure builds up more smoothly without large fluctuations, thereby improving the controllability and stability of the damping.

[0037] (5) During the process of fluid inflow and pressure establishment, since the flow path Fd2 is a normally through-hole design, the fluid first flows from Fd2 into the pressure chamber to establish pressure, so the pressure chamber pressure establishment speed is fast. When the shock absorber enters the high-frequency tensile working state from the low-frequency working state, since the pressure establishment speed in the shock absorber cylinder and the valve group fluid inlet channel is greater than the pressure establishment speed in the pressure chamber, after the fluid pressure in the shock absorber cylinder and the valve group fluid inlet channel is greater than the closing force provided by the preload force and the pressure chamber pressure on the control valve, the gap between the outlet of the valve group fluid inlet channel and the valve plate unit opens and establishes the leakage flow path Fd4. At this time, part of the fluid flows out from the leakage flow path Fd4, and the opening and closing boundaries of the control valve and the leakage flow path Fd4 are obvious.

[0038] (6) Since the flow path Fd2 is designed as a regular through hole, rather than a gap that is difficult to control the flow rate in the prior art, the flow control parameters of the first fluid inflow channel, the buffer chamber, and the second fluid inflow channel are easy to accurately design and control. At the same time, the flow path Fd2 is in a sealed fit with the discharge gap, the pressure relief chamber, the fluid outflow channel, etc., and the pressure chamber and other components are also in a sealed fit. In this way, the fluid inflow channel and the pressure chamber are both in a sealed condition, and the amount of fluid entering the pressure chamber can be accurately controlled. Furthermore, the pressure buildup in the pressure chamber and the closing force of the control valve can be accurately controlled, and the opening frequency control accuracy of the FAD valve group is higher and more accurate.

[0039] Other features and advantages of the present invention will become apparent from the following more detailed description, which, taken in conjunction with the accompanying drawings, illustrates, by way of example, the principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative work.

[0041] FIG1 is a schematic structural diagram of a shock absorber according to the present invention.

[0042] FIG2 is a schematic structural diagram of a frequency adaptive damping valve assembly according to the present invention.

[0043] FIG3 is a schematic structural diagram of the control valve in the present invention.

[0044] FIG4 is a schematic structural diagram of the balancing valve in the present invention.

[0045] FIG5 is an enlarged schematic diagram of the sealing element in the balancing valve.

[0046] FIG6 is a schematic structural diagram of the supporting part of the balancing valve.

[0047] FIG7 is a schematic diagram of the cooperation between the sealing element and the supporting portion in the balancing valve.

[0048] FIG8 is a schematic diagram of the assembly of the control valve and the balancing valve in the present invention.

[0049] FIG9 is an enlarged schematic diagram of the seal fit in the assembly of the control valve and the balancing valve in the present invention.

[0050] FIG10 is a schematic diagram of the assembly of the movable valve and the balancing valve in the present invention.

[0051] FIG11 is a schematic diagram of the pressure relief chamber and front and rear flow passages in the present invention.

[0052] FIG12 is a schematic diagram of the fluid flow path of a shock absorber according to an embodiment of the present invention.

[0053] FIG13 is an enlarged schematic diagram of the fluid flow path of the frequency adaptive damping valve assembly in FIG12 .

[0054] FIG14 is a schematic diagram of the fluid flow path of another embodiment of the shock absorber of the present invention.

[0055] Figure 15 is an enlarged schematic diagram of the fluid flow path of the frequency adaptive damping valve assembly in Figure 14. 100-piston rod, 200-first support washer, 300-FAD valve assembly, 301-upper housing, 302-lower housing, 303-movable valve, 304-control valve, 305-balancing valve, 306-FAD valve oil inlet channel, 400-FAD inlet channel, 500-circulation valve assembly, 600-piston assembly, 700-reset valve assembly, 800-second support washer, 3031-spring plate, 30311-connecting hole, 3032-support valve plate unit, 3033-support seal, 3041-spring card, 30441-mounting surface, 30442-rod-shaped mounting portion, 30443-buffer cavity forming portion, 30444-first fluid inflow channel, 30445- Edge, 30446-buffer chamber, 3042-valve plate unit, 3043-limiting valve plate, 3044-valve upper seat, 3051-valve lower seat, 30511-installation space, 30512-groove, 30513-convex hull, 30514-first joint surface, 30515-second joint surface, 3052-second fluid inflow channel, 3053-fluid outflow channel, 3054-installing valve plate, 3055-sealing element, 3056-sealing elastic valve plate, 3057-leakage valve plate, 307-pressure chamber, 308-leakage gap, 309-pressure relief chamber, 3010-balancing chamber, 3021-discharge port, 3011-limiting support portion, 3012-matching portion, 3013-leakage hole. DETAILED DESCRIPTION

[0056] It is easy to understand that, based on the technical solution of the present invention, a person of ordinary skill in the art can imagine various embodiments of the present invention without changing the essential spirit of the present invention. Therefore, the following specific embodiments and drawings are only exemplary illustrations of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as limitations or definitions of the technical solution of the present invention. The present invention can be implemented in various forms, and the embodiments are not intended to limit the scope of the present invention. On the contrary, the purpose of providing these embodiments is to enable those skilled in the art to understand the present invention more thoroughly. The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the innovative concept of the present invention.

[0057] As shown in FIG. 2 , the frequency adaptive damping valve assembly 300 of the present invention includes an assembly housing, a valve component disposed inside the housing, and the valve component includes a control valve 304 , a balancing valve 305 , and a movable valve 303 .

[0058] In order to facilitate the assembly of components inside the shell, the shell is a combined shell. For example, in this embodiment, the component shell can be divided into an upper shell 301 and a lower shell 302. The upper shell 301 and the lower shell 302 are adapted and assembled to form an internal installation space. The component shell is configured as two parts, the upper shell 301 and the lower shell 302, mainly to facilitate the installation of other components located inside the shell. In some cases, the upper shell 301 can be formed by the end of the shock absorber piston rod. Therefore, the division method of the upper shell 301 and the lower shell 302 shown in Figure 1 is only an example. When other structures or components can be installed and set, the division and matching method of the component shell is not limited to that shown in Figure 1.

[0059] As shown in Figure 2 , the upper end of the housing is provided with a valve assembly fluid inlet channel 306, which also serves as the first pressure chamber 306 of the frequency adaptive damping valve assembly 300. As shown in Figure 1 , the valve assembly fluid inlet channel / first pressure chamber 306 is in fluid communication with the FAD inlet channel 400 disposed in the shock absorber valve stem. Fluid enters the FAD valve assembly 300 through the valve assembly fluid inlet channel 306. In the embodiment shown in Figure 2 , the valve assembly fluid inlet channel 306 is disposed on the upper housing 301, thereby forming an inlet port suitable for fluid connection to the first pressure chamber 306.

[0060] As shown in FIG. 2 and FIG. 3 , the control valve 304 includes a valve upper seat 3044 , a position-limiting valve disc 3043 , a valve disc unit 3042 and a fixing component 3041 .

[0061] The valve upper seat 3044 includes a mounting surface 30441 extending from the center to the edge. The main body of the valve upper seat 30444 extends upward from the mounting surface 30441 to form a rod-shaped mounting portion 30442. The rod-shaped mounting portion 30442 is hollow and has a continuous hole extending through the length of the rod-shaped mounting portion 30442. This continuous hole serves as the first fluid inflow channel 30444. The main body of the valve upper seat 30444 extends downward from the mounting surface 30441 to form a buffer cavity-forming portion 30445. The interior space of the buffer cavity-forming portion 30445 serves as a buffer cavity 30446. The lower edge 30445 of the buffer cavity-forming portion 30445 is open. An inlet at the upper end of the first fluid inflow channel 30444 is in fluid communication with the inner cavity at the upper end of the valve manifold housing. The top inlet of the buffer chamber 30446 is fluidically connected to the outlet at the lower end of the first fluid inflow channel 30444, and the lower portion of the buffer chamber 30446 is open and has an open structure. Specifically, the outer shape of the buffer chamber forming portion 30443 can be cylindrical or eccentric cylindrical. The buffer chamber 30446 located within the buffer chamber forming portion 30443 can be conical, columnar, or a generally cylindrical cavity. As shown in FIG2 , the buffer chamber 30446 is conical, with the top of the cone being fluidically connected to the outlet at the lower end of the first fluid inflow channel 30444 and the bottom of the cone being open. From the top to the bottom of the cone, the cross-sectional area of ​​the buffer chamber gradually increases and becomes larger than the cross-sectional area of ​​the first fluid inflow channel 30444. As shown in FIG3 and FIG8 , the buffer chamber 30446 is generally cylindrical, with a diameter greater than the diameter of the first fluid inflow channel 30444, or a cross-sectional area greater than the cross-sectional area of ​​the first fluid inflow channel 30444. After the fluid enters the buffer chamber 30446 through the first fluid inflow channel 30444, the increased space allows for a certain degree of fluid pressure relief, or temporary buffering before entering the subsequent flow path. This is why it's called a buffer chamber. The presence of buffer chamber 30446 within the fluid inflow channel leading to the pressure chamber allows for a smoother pressure buildup without significant fluctuations as the fluid flows into the pressure chamber, thereby improving the controllability and stability of the damping.

[0062] As shown in Figures 3 and 8, the limiting valve disc 3043 and the valve disc unit 3042 are mounted on the rod-shaped mounting portion 30442 and secured by a fixing component 3041. The limiting valve disc 3043 is mounted on the mounting surface 30441, the valve disc unit 3042 is mounted on the limiting valve disc 3043, and the fixing component 3041 presses against the limiting valve disc 3043. The limiting valve disc 3043 serves as a mounting support and stress relief point for the valve disc unit 3042, and also protects the valve disc unit 3042 from deformation. The valve disc unit 3042 provides a seal under the action of a closing force. In the embodiment shown in Figure 3, the fixing component 3041 is a spring clip that is mounted on the rod-shaped mounting portion 30442 and presses against the valve disc unit 3042, thereby securing the valve disc unit 3042 and the limiting valve disc 3043 to the rod-shaped mounting portion 30442. In other embodiments, the fixing component 3041 can also adopt other fixing methods, such as screws, pins, etc. The screws and pins cooperate with the rod-shaped mounting portion 30442 to fix the valve plate unit 3042 and the limiting valve plate 3043 on the rod-shaped mounting portion 30442.

[0063] As shown in Figures 2, 4, 8 and 10, the balancing valve 305 includes a valve lower seat 3051, a mounting valve disc 3054, a sealing element 3055, and a sealing elastic valve disc 3056.

[0064] The upper portion of the valve lower seat 3051 body forms a mounting space 30511 for the buffer cavity forming portion 30445. The lower portion of the valve lower seat 3051 body is provided with at least two regular through holes to form fluid channels, including a second fluid inlet channel 3052 and a fluid outlet channel 3053. The second fluid inlet channel 3052 extends vertically (or diagonally in other embodiments) through the valve lower seat 3051 body. The inlet at the upper end of the second fluid inlet channel 3052 is in fluid communication with the buffer cavity 30446, while the outlet at the lower end of the second fluid inlet channel 3052 is in fluid communication with the pressure chamber 307. The diameter or flow cross-sectional area of ​​the second fluid inlet channel 3052 is smaller than that of the first fluid inlet channel 30444, enabling pressure / flow control. Therefore, the second fluid inlet channel 3052 serves as a pressure / flow control hole, adjusting the fluid flow path pressure / flow by varying its diameter (or flow cross-sectional area). The cross-sectional shapes of the first fluid inflow channel 30444 and the second fluid inflow channel 3052 are not limited. Preferably, the cross-sectional area of ​​the first fluid inflow channel 30444 is two or more times the cross-sectional area of ​​the second fluid inflow channel 3052. As shown in Figures 2, 4, and 11, the lower inlet of the fluid outflow channel 3053 is in fluid communication with the pressure chamber 307, while the upper outlet of the fluid outflow channel 3053 is in fluid communication with the drain slit 308.

[0065] As shown in Figure 2, the sealing element 3055 is used to seal the balancing valve 305 against the inner wall of the housing, thereby dividing the interior of the housing into two relatively independent upper and lower spaces. In the embodiment shown in Figure 4, a groove 30512 is formed on the outer wall of the valve lower seat 3051, into which the mounting valve disc 3054 and the sealing element 3055 are snap-fitted. The mounting valve disc 3054 is located at the top, and the sealing element 3055 is located at the bottom. The mounting valve disc 3054 serves as a support for the sealing element 3055, ensuring that the sealing element 3055 operates and deforms according to the specified trajectory.

[0066] In a preferred embodiment, the sealing element 3055 is a flexible, annular sealing element 3055, and the valve lower seat 3051 includes a support portion that penetrates the sealing element 3055. As shown in Figures 6 and 7, the support portion has a first engagement surface 30514 that seals with the upper end surface of the sealing element 3055, and a second engagement surface 30515 that seals with the lower end surface of the sealing element 3055. The sealing element 3055 is mounted on the support portion by the first engagement surface 30514 and the second engagement surface 30515, so as to bias the valve member toward the first pressure chamber 306 using a force dependent on the pressure in the second pressure chamber 307. The second engagement surface 30515 and the first engagement surface 30514 are similar to the upper and lower inner sidewalls of the groove 30512.

[0067] Preferably, the inner diameter of the sealing element 3055 is smaller than the outer diameter of the support portion that fits into the inner hole of the sealing element 3055, and the outer diameter of the sealing element 3055 is larger than the inner diameter of the housing that seals against the sealing element 3055. This configuration allows the sealing element 3055 to form an interference fit with the support portion and the inner wall of the housing.

[0068] As shown in Figure 7, preferably, the supporting part is provided with a boss on the side facing the first pressure chamber 306, and the mounting valve plate 3054 is mounted on the boss, and at least a portion of the upper end surface of the mounting valve plate 3054 is abutted against the valve member body, and the lower end surface of the mounting valve plate 3054 and the boss end surface jointly serve as the first joint surface 30514 and are sealed with the sealing element 3055.

[0069] The outer periphery of the sealing element 3055 is sealed against the inner wall of the housing and can slide relative to it. In the embodiment shown in Figures 4 and 5, the edge of the sealing element 3055 is provided with a downwardly extending bump 30513. The bump 30513 can reduce deformation during the upward and downward sliding of the sealing element 3055, thereby improving sealing performance and durability.

[0070] As shown in Figures 2, 8, and 9, the buffer cavity forming portion 30443 is placed within the buffer cavity forming portion installation space 30511 on the body of the lower valve seat 3051. The lower open edge 30445 of the buffer cavity forming portion 30443 is placed on the body of the lower valve seat 3051, and the upper inlet of the second fluid inflow channel 3052 is located within the lower open edge of the buffer cavity forming portion 30443, thereby fluidically communicating with the buffer cavity 30446. A sealing elastic valve disc 3056 is disposed between the upper valve seat 3044 (buffer cavity forming portion 30443) and the lower valve seat 3051 to prevent fluid within the buffer cavity 30446 from leaking through the assembly gap between the upper valve seat 3044 (buffer cavity forming portion 30443) and the lower valve seat 3051. Specifically, the sealing elastic valve disc 3056 can be disposed along the lower open edge 30445 of the buffer cavity forming portion 30443. At this time, the fluid flowing into the buffer chamber through the first fluid inflow channel 30444 can only flow to the pressure chamber 307 through the second fluid inflow channel 3052. As shown in Figure 4, two inner and outer support points are provided on the valve lower seat 3051, and the sealing elastic valve disc 3056 is placed on these two support points. The inner support point is higher than the outer support point. The height matching of the support points and the elastic matching with the sealing elastic valve disc 3056 can improve the sealing performance.

[0071] In the embodiment shown in the accompanying drawings of the present invention, the upper valve seat 3044 and the lower valve seat 3051 are separate structures. Those skilled in the art will appreciate that in other embodiments not shown in the accompanying drawings, the upper valve seat 3044 and the lower valve seat 3051 may be an integrated structure, in which case the buffer cavity forming portion (30443) and the lower valve seat (3051) also achieve a sealed fit.

[0072] As shown in Figures 2, 8, 9, and 11, a leakage gap 308 is provided between the outer wall of the buffer cavity forming portion 30443 and the inner wall of the valve lower seat 3051 (the installation space 30511 of the buffer cavity forming portion 30443). This leakage gap 308 extends along the gap between the valve lower seat 3051 and the valve upper seat 3044 to the pressure relief chamber 309. The lower end of the leakage gap 308 is in fluid communication with the outlet fluid at the upper end of the fluid outflow channel 3053. The leakage gap 308 can be formed by the eccentric structure of the buffer cavity forming portion 30443 or by the outer dimensions of the buffer cavity forming portion 30443 being smaller than the installation space of the buffer cavity forming portion 30445.

[0073] The fluid outflow channel 3053 can be configured in a variety of ways. In the embodiments shown in Figures 4, 8, 11, and 13, the upper outlet of the fluid outflow channel 3053 is not covered by the sealing elastic valve disc 3056 and is located outside the edge of the sealing elastic valve disc 3056. In this case, the upper outlet of the fluid outflow channel 3053 does not require a discharge valve disc 3057, and the fluid can flow directly into the discharge gap 308 through the fluid outflow channel 3053.

[0074] In the embodiments shown in Figures 2, 9, and 12, the upper outlet of the fluid outflow channel 3053 is covered by a sealing elastic valve disc 3056, located inside the edge of the sealing elastic valve disc 3056. To prevent the sealing elastic valve disc 3056 from obstructing fluid from flowing through the fluid outflow channel 3053 into the leakage gap 308, as shown in Figure 9, a leakage valve disc 3057 may be provided at the upper outlet of the fluid outflow channel 3053. The leakage valve disc 3057 is located between the upper outlet of the fluid outflow channel 3053 and the sealing elastic valve disc 3056. This coordination of the sealing elastic valve disc 3056 and the leakage valve disc 3057 allows the fluid in the pressure chamber to flow into the leakage gap 308 through the leakage valve disc 3057 when the shock absorber is in a high-frequency tensile state. However, the fluid in the leakage gap 308 cannot flow back into the buffer chamber 30466 or the pressure chamber through the sealing elastic valve disc 3056 and the leakage valve disc 3057. The discharge valve disc 3057 can be a valve disc with a flow notch or slit. In this case, the discharge valve disc 3057 partially covers the outlet of the fluid outflow channel 3053, and the sealing elastic valve disc 3056 covers the discharge valve disc 3057. The fluid in the pressure chamber flows from the fluid outflow channel 3053 into the discharge slit 308 through the notch or slit of the discharge valve disc 3057. The discharge valve disc 3057 can be a throttle valve. Because the discharge valve disc 3057 can be conveniently adjusted by selecting and changing its thickness, width, and the number of notches or slits, and has a wide range of options, the provision of the discharge valve disc 3057 allows for convenient, high-precision, and stable control of flow, pressure, and damping. In the embodiment shown in Figure 9, the sealing elastic valve disc 3056 is used to seal the valve lower seat and the valve upper seat, thereby ensuring that the fluid in the buffer chamber 307 does not leak. The relief valve plate 3057 ensures that the fluid in the pressure chamber 307 flows into the relief gap 308 through the opening or gap on the relief valve plate 3057 .

[0075] To facilitate installation of the sealing elastic valve disc 3056 and the relief valve disc 3057, a limiting boss or groove is provided on the valve lower seat 3051 around the upper inlet of the second fluid inflow channel 3052. The sealing elastic valve disc 3056 or the relief valve disc 3057 is fitted onto the limiting boss or placed in the limiting groove to prevent the sealing elastic valve disc 3056 or the relief valve disc 3057 from shifting relative to the valve lower seat 3051.

[0076] As shown in Figures 2 and 10, the movable valve 303 includes a support valve disc unit 3032, a support seal 3033, and a spring disc 3031. The support valve disc unit 3032 is disposed at the bottom of the housing. The support seal 3033 is placed on the support valve disc unit 3032. The outer peripheral edge of the support seal 3033 is sealed against the inner wall of the housing, and the spring disc 3031 and the support seal 3033 can slide relative to each other up and down along the inner wall of the housing. The spring disc 3031 is disposed on the support seal 3033. The support seal 3033 has a certain thickness, and a certain space is formed between the spring disc 3031 and the support valve disc unit 3032.

[0077] The spring plate 3031 is provided with a mounting hole for mounting the valve lower seat 3051. The bottom of the valve lower seat 3051 body is provided with a stepped surface that mates with the mounting hole. The valve lower seat 3051 is placed on the mounting hole via this stepped surface, thereby providing mounting support for the valve lower seat 3051 (balancing valve 305) through the spring plate 3031. The valve lower seat 3051 has a certain height. When the balancing valve 305 is mounted on the spring plate 3031 through the valve lower seat 3051, there is a certain space between the sealing element 3055 and the spring plate 3031. In other words, the sealing element 3055 and the spring plate 3031 do not contact each other and are suspended in the air. This design does not affect pressure buildup or the closing force between the outlet of the valve assembly fluid inlet channel 306 and the valve plate unit 3042 during operation, thus preventing the generation of nonlinear loads.

[0078] The spring plate 3031 is also provided with one or more connecting holes 30311 connecting the upper and lower sides. Through these connecting holes, the spaces above and below the spring plate 3031 are connected to form a relatively independent space serving as the pressure chamber 307. The upper edge of the pressure chamber is sealed by a sealing element 3055, while the lower edge of the pressure chamber 307 is sealed by a support seal 3033. After the valve lower seat 3051 is installed on the spring plate 3031, the lower outlet of the second fluid inflow channel 3052 is connected to the pressure chamber, while the lower inlet of the fluid outflow channel 3053 is connected to the pressure chamber 307. The support seal (O-ring) 3033 has a certain thickness. The spring plate 3031 and the support seal 3033 cooperate to provide a certain space below the spring plate 3031 to accommodate deformation of the spring plate 3031, thereby ensuring that the valve lower seat 3051 (balancing valve 305) remains suspended. This will not affect the pressure build-up, nor will it affect the closing force between the outlet of the valve group fluid inlet channel 306 and the valve plate unit 3042 during operation, thereby avoiding the generation of nonlinear loads.

[0079] The lower inlet of the fluid outflow channel 3053 can be positioned in a variety of ways. In the embodiments shown in Figures 4, 8, 11, and 13, the lower inlet of the fluid outflow channel 3053 is located on the side of the valve lower seat 3051 body, thereby positioning the lower inlet of the fluid outflow channel 3053 in the space above the spring plate 3031 in the pressure chamber. In the embodiments shown in Figures 2, 9, and 12, the lower inlet of the fluid outflow channel 3053 is located on the bottom surface of the valve lower seat 3051 body, and together with the lower outlet of the second fluid inflow channel 3052, both point to the space below the spring plate 3031 in the pressure chamber.

[0080] As shown in Figures 2, 12, and 13, the bottom of the housing is recessed, creating a space that accommodates deformation of the valve disc unit 3032. This space, referred to herein as the balancing chamber 3010, is also provided at the bottom of the housing. This recessed space is connected to the exterior of the valve assembly housing by a drain port 3021. This drain port 3021 is used to drain air or oil from the recessed space in certain circumstances.

[0081] As shown in Figure 2, a position-limiting support 3011 for mounting the valve disc 3054 is provided on the sidewall of the valve assembly housing. The upper edge of the mounting valve disc 3054 in the balancing valve 305 rests against this position-limiting support 3011. In the embodiment shown in Figure 2, the position-limiting support 3011 is formed by the end of the upper housing 301. As shown in Figure 2, the end of the upper housing 301 is a flat structure. That is, the end surface where the position-limiting support 3011 mates with the mounting valve disc 3054 is flat, not a gradually curved surface. Rounded corners are provided on the inner and outer sides of the upper housing end surface. Specifically, the transition between the upper housing end surface and the inner and outer sidewalls (at the corners of the upper housing end surface) is provided with rounded corners. In other words, the inner and outer sides (corners) of the position-limiting support 3011 are provided with rounded corners. The rounded corners on the outer side of the upper housing end surface are located close to the inner sidewall of the lower housing and serve as a guide during assembly of the upper and lower housings. The rounded corner structure on the inner side of the upper housing's end face faces the housing's interior space. Specifically, the corner where the upper housing's end face transitions to the inner wall of the upper housing forms a rounded corner, providing a smooth support point for the valve disc 3054 during movement. During assembly, the end face serves as the mounting stop 3011 for the valve disc 3054. When the valve disc 3054 and sealing element 3055 move along the housing's inner wall, the rounded corner structure facing the housing's interior space serves as a smooth support point for the upward and downward movement of the valve disc 3054 and sealing element 3055. After the FAD valve assembly is assembled, the control valve and the housing's top have a certain closing force, and the control valve, balancing valve, and movable valve have certain deformation preload requirements. The inner rounded corner feature serves as the support point for the balancing valve's deformation. During operation, under low-frequency conditions when the FAD valve assembly is not operating, the balancing valve tends to deform upward. The inner rounded corner provides a smooth upward support point for the balancing valve's mounting disc and sealing element.

[0082] As shown in Figure 2, the top inner wall of the valve group housing is provided with a mating portion 3012 that mates with the upper side of the valve plate unit 3042. When the upper side of the valve plate unit 3042 abuts against the mating portion 3012, a certain value of closing force and sealing is achieved between the control valve 304 (valve plate unit 3042) and the mating portion 3012. Specifically, the mating portion 3012 that mates with the upper side of the valve plate unit 3042 is formed by the outlet edge of the valve group fluid inlet channel 306, and the cross-sectional area of ​​the valve group fluid inlet channel 306 is larger than the cross-sectional area of ​​the first fluid inflow channel 30444. The valve group fluid inlet channel 306 extends from the upper shell 301 to the interior of the shell until a closing force mating relationship is formed with the control valve 304 (valve plate unit 3042). Preferably, the mating portion is located near the outer periphery of the valve plate unit 3042.

[0083] As shown in FIG2 , the cross-sectional area of ​​the fluid inlet channel 306 of the valve group can change step by step. For example, the inner cavity of the fluid inlet channel 306 of the valve group changes in a step-like manner, that is, the cross-sectional area of ​​the part closer to the control valve 304 is larger, and the space is also larger, forming a spatial variation structure, which serves as a buffer for the fluid inflow pressure.

[0084] The above describes the component combination and structure of the FAD valve assembly 300 of the present invention. Next, the assembly process of the FAD valve assembly 300 will be described.

[0085] During assembly, the movable valve 303 is installed first. The support valve disc unit 3032 is first placed at the bottom of the lower housing 302. During installation, air or oil at the bottom of the housing can be discharged through the drain port 3021 to avoid affecting the installation of the support valve disc unit 3032. Because the bottom shell of the lower housing 302 is concave, a space is formed between the bottom of the lower housing 302 and the support valve disc unit 3032. When the support valve disc unit 3032 deforms downward under the action of fluid pressure, it provides space for the support valve disc unit 3032 to deform. The deformation time of the support valve disc unit 3032 provides pressure balance, which is referred to as the balance chamber 3010 in the present invention. The support seal (O-ring) 3033 is set on the support valve disc unit 3032, and the spring plate 3031 is set on the support seal (O-ring) 3033. The support seal is used to seal the support valve disc unit 3032 and the inner wall of the lower housing 302. At this point, the movable valve 303 is installed.

[0086] Next, install the balancing valve 305. The valve lower seat 3051 is placed on the spring plate 3031. The stepped surface at the bottom of the valve lower seat 3051 body mates with the mounting hole of the spring plate 3031, thus providing mounting support for the valve lower seat 3051 (balancing valve 305). The sealing element 3055 is sealed and slidably engaged with the inner wall of the lower housing 302. Because the spring plate 3031 is provided with a connecting hole connecting both sides, a relatively independent space is formed between the balancing valve 305 and the supporting valve plate unit 3032. This space is sealed from the housing inner wall at the top by the sealing element 3055, and from the housing inner wall at the bottom by the supporting seal 3033. This space is referred to as the pressure chamber 307 or the second pressure chamber 307 in the present invention. The upper portion of the second pressure chamber 307 is sealed from the housing inner wall by the sealing element 3055. Therefore, the second pressure chamber 307 is demarcated on the side facing the first pressure chamber 306 by the flexible annular sealing element 3055.

[0087] Next, the control valve 304 is installed, and the buffer cavity forming portion 30443 is placed into the installation space of the buffer cavity forming portion 30443 on the body of the valve lower seat 3051. A sealing elastic valve disc 3056 is provided at the lower open edge of the buffer cavity forming portion 30443, so that the lower open edge of the buffer cavity forming portion 30443 and the body of the valve lower seat 3051 are sealed together, thereby forming a sealed buffer cavity 30446. The upper inlet of the second fluid inflow channel 3052 is in fluid communication with the buffer cavity 30446. After the buffer cavity forming portion 30443 is placed into the installation space of the buffer cavity forming portion on the body of the valve lower seat 3051, a leakage gap 308 is formed between the valve upper seat 3044 and the valve lower seat 3051, and the leakage gap 308 is in fluid communication with the fluid outflow channel 3053. The part where the lower part of the valve upper seat 3044 and the bottom of the valve lower seat 3051 are assembled and matched is sealed by a sealing elastic valve plate 3056, so that the fluid in the buffer chamber can only flow into the pressure chamber 307 through the first fluid inflow channel 30444, preventing the fluid in the buffer chamber 30446 from leaking to other spaces or cavities through the assembly gap between the valve upper seat 3044 and the valve lower seat 3051, affecting pressure establishment and pressure maintenance.

[0088] After the upper valve seat 3044 is installed on the lower valve seat 3051, the upper housing 301 is installed into the lower housing 302. After the upper housing 301 is in place, the limit support portion 3011 at the end of the upper housing 301 abuts against the upper end surface of the installed valve disc 3054; the outlet edge of the valve group fluid inlet channel 306 on the upper housing 301 abuts against the upper end surface of the valve disc unit 3042.

[0089] After the valve upper seat 3044 is in place, a relatively independent space is formed between the balancing valve 305 (with the valve disc 3054 installed), the control valve 304, and the inner wall of the valve block housing (the upper housing 301), serving as a pressure relief chamber 309. The pressure relief chamber 309 communicates with the exterior of the valve block housing through a leak hole 3013 provided in the upper housing 301.

[0090] After the upper valve seat 3044 is installed on the lower valve seat 3051, the upper housing 301 and the lower housing 302 are fixedly connected. Under the preload force of the support valve disc unit 3032, the support seal 3033, and the spring disc 3031, the upper side of the valve disc unit 3042 abuts against the top inner wall of the upper housing 301, creating a certain closing force and sealing performance between the control valve 304 and the outlet edge of the valve manifold fluid inlet channel 306. The closing force can be adjusted based on the material properties of the support valve disc unit 3032, the support seal 3033, and the spring disc 3031, as well as the assembly relationship, preload, and other factors. At this time, since the valve plate unit 3042 in the control valve 304 is sealed with the upper shell 301 (the outlet edge of the valve group fluid inlet channel 306), the sealing element 3055 in the balancing valve 305 is sealed with the inside of the lower shell 302, and a relatively independent space is formed between the balancing valve 305, the control valve 304 and the inner wall of the valve group shell, which is called the pressure relief chamber 309 in the present invention.

[0091] After assembly, the FAD valve assembly 300 forms a spatial structure comprising a valve assembly fluid inlet channel 306, a buffer chamber 30446, a pressure chamber 307, a pressure relief chamber 309, and a balancing chamber 3010. The valve assembly fluid inlet channel 306, the first fluid inflow channel 30444, the buffer chamber 30446, the second fluid inflow channel 3052, the pressure chamber 307, the fluid outflow channel 3053, and the pressure relief chamber 309 are fluidically interconnected to form a fluid pathway. Specifically, fluid in the valve assembly fluid inlet channel 306 can enter the buffer chamber 30446 via the first fluid inflow channel 30444 in the control valve 304, and fluid in the buffer chamber 30446 can enter the pressure chamber 307 via the second fluid inflow channel 3052 in the balancing valve 305. Fluid in the pressure chamber 307 can enter the leakage gap 308 between the control valve 304 and the balancing valve 305 via the fluid outflow channel 3053 in the balancing valve 305. Then it enters the pressure relief chamber 309 through the leakage gap 308. The fluid in the pressure relief chamber 309 can flow to the outside of the valve group shell through the leakage hole 3013. In the flow path that enters the valve group fluid inlet channel 306 and flows out of the valve group shell through the leakage hole 3013, each link, including the first fluid inflow channel 30444, the second fluid inflow channel 3052, the fluid outflow channel 3053, the leakage gap 308 and the leakage hole 3013, are all designed as normal through holes. And the flow path as a whole presents a circular flow path, that is, the flow path enters the interior of the valve group from the upper end of the valve group, but will not flow out from the lower end of the valve group 300, and the fluid will not flow back from the lower end of the valve body into the interior of the valve body. Compared with the existing technology, this will not affect the pressure establishment or the establishment of closing force.

[0092] As fluid flows into pressure chamber 307, pressure gradually builds within pressure chamber 307 and the valve assembly. This pressure acts upward on balancing valve 305 and is then transmitted through balancing valve 305 to control valve 304. At this point, the closing force between the outlet of the valve assembly's fluid inlet channel 306 and the valve disc unit 3042 is the sum of the preload provided by the supporting valve disc unit 3032, spring disc 3031, and valve disc unit 3042, as well as the pressure within the pressure chamber. This closing force originates from two components: one component is the preload determined by the valve assembly structure, resulting from the assembly relationship between the supporting valve disc unit 3032, spring disc 3031, valve disc unit 3042, the upper and lower housings, and the elastic properties of the materials. The other component is the internal pressure generated by the fluid flowing into the pressure chamber and building up pressure. The pressure in the pressure chamber builds up a certain level of pressure, which pushes upward on balancing valve 305 and control valve 304, thereby strengthening the closing force of control valve 304. In short, in the initial stage of pressure establishment, the closing force is provided by the preload force. After the fluid flows into the pressure chamber, the closing force is provided by the preload force and the internal pressure. At this time, the control valve 304 can only be opened when the pressure of the valve group fluid inlet channel 306 is greater than the closing force composed of the above two parts. The size of the preload force, the constant pressure value, the closing force, etc. can be specifically set according to the damping requirements. Since the closing force provided by the preload force always exists (it can therefore also be called the initial closing force), and the first fluid inflow channel 30444 is a normally open design, the fluid in the valve group fluid inlet channel 306 will first flow into the first fluid inflow channel 30444, rather than opening the control valve 304 to flow out from the flow path Fd4.

[0093] When the control valve 304 is opened, that is, the control valve 304 moves downward, the gap between the valve plate unit 3042 and the outlet edge of the valve group fluid inlet channel 306 is opened, and a part of the fluid in the valve group fluid inlet channel 306 can flow directly into the pressure relief chamber 309 from the flow path Fd4 through the opened gap.

[0094] The present invention refers to valve 304 as a control valve because one of its functions is to control the opening and closing of the gap between the valve plate unit 3042 and the outlet edge of the valve assembly fluid inlet channel 306. Of course, control valve 304 also has other functions, such as providing a fluid channel and a buffer chamber. These other functions are not limited or ambiguous by being called a control valve 304. The present invention refers to valve 305 as a balancing valve 305 because one of its functions is to isolate the discharge chamber from the pressure chamber, thereby allowing the pressure in the pressure chamber to be established more accurately and quickly. Of course, balancing valve 305 also has other functions, such as providing a fluid channel. These other functions are not limited or ambiguous by being called a balancing valve 305. The present invention refers to valve 303 as a movable valve 303 because one of its functions is to provide deformation space for the pressure chamber. Of course, movable valve 303 also has other functions, such as providing support. These other functions are not limited or ambiguous by being called a movable valve 303.

[0095] In the present invention, the control valve 304, the balancing valve 305, and the movable valve 303 are all movable components that can move up and down within the component housing. In the movable valve 303, the support valve disc unit 3032 is sealed against the inner wall of the component housing by a support seal 3033. However, the support seal 3033 and the spring disc 3031 are movable relative to the inner wall of the component housing. For example, when the fluid pressure in the pressure chamber reaches a certain level, or when the control valve 304 moves downward, the support valve disc unit 3032 and / or the spring disc 3031 may drop in the middle and tilt upward at the edges, or the support seal 3033 and the spring disc 3031 may move downward relative to the inner wall of the component housing. In the balancing valve 305, the sealing element 3055 is sealed against the inner wall of the housing. When the control valve 304 moves downward, it pushes the balancing valve 305 downward. At this time, the sealing element 3055 and the mounting valve disc 3054 move downward along the inner wall of the component housing, and the valve lower seat 3051 also moves downward simultaneously.

[0096] The diameter (flow cross-sectional area) of the fluid inlet channel 30444 is smaller than the diameter (flow cross-sectional area) of the valve group fluid inlet channel 306, and the diameter (flow cross-sectional area) of the first fluid channel 3052 is smaller than the diameter (flow cross-sectional area) of the fluid inlet channel 30444. Therefore, the process in which the fluid flows from the valve group fluid inlet channel 306, the first fluid inlet channel 30444, the buffer chamber, the second fluid inflow channel 3052 and finally enters the pressure chamber is a process in which pressure and damping are gradually established.

[0097] During the assembly process of the FAD valve group 300, the upper shell 301 and the lower shell 302 are assembled using a controlled preload force. The preload force setting is used to eliminate the accumulation of component tolerances and improve the stability of the damping force.

[0098] The valve upper seat 3044 adopts a regular through hole as the first fluid inflow channel 30444. The lower end outlet of the first fluid inflow channel 30444 is connected to the buffer cavity with increased space. This structural design meets the mold forming solutions such as powder metallurgy, metal injection materials and composite materials, and improves the stability of the FAD valve group and shock absorber.

[0099] The second fluid inflow channel 3052 serves as the input pressure flow control hole of the valve lower seat 3051, and has high precision requirements. The product stability can be improved by designing short holes and mold molding solutions.

[0100] The present invention avoids the problem of durable attenuation of the supporting spring sheet in the prior art. The sealing element 3055 and the valve lower seat 3051 are installed in a groove, and the sealing element 3055 and the spring sheet 3031 are suspended in the air to avoid nonlinear increase in load. While meeting the sealing requirements, durability and support are ensured, thereby improving the durability of the valve group and the stability of damping.

[0101] In this embodiment, according to the valve group force value requirement, different closing forces are achieved through the combination of the number, thickness, and material of the valve plates in the valve plate unit 3042, providing different closing force designs and achieving different damping requirements.

[0102] Regarding sealing design, the upper end of the valve disc unit 3042 of the control valve 304 rests against the inner wall of the upper housing 301, where the control valve 304 and the upper housing 301 cooperate to achieve a seal under the closing force. At this point, the control valve 304 is in a closed state. When fluid in the shock absorber flows through the FAD inlet channel 400 in the valve stem and into the valve block fluid inlet channel 306, the valve disc unit 3042 forms a seal against the interior of the upper housing 301 under the closing force. As a result, pressure builds up within the valve block fluid inlet channel 306.

[0103] Although the control valve 304 is sealed against the interior of the upper housing 301 by the valve disc unit 3042 under the closing force, a flow gap can be opened between the control valve 304 and the upper housing 301, at which point the control valve 304 is in the open state. Specifically, when the pressure within the valve block fluid inlet channel 306 reaches a certain level, the fluid within the valve block fluid inlet channel 306 pushes the control valve 304 downward, reducing or even eliminating the closing force between the valve disc unit 3042 and the outlet edge of the valve block fluid inlet channel 306. This opens the gap Fd4 between the valve disc unit 3042 and the outlet edge of the valve block fluid inlet channel 306, allowing fluid to enter the pressure relief chamber through this gap. Whether the control valve 304 is open and the size of the open flow channel depend on the closing force between the control valve 304 and the upper housing 301.

[0104] The fixing member 3041 cooperates with the valve upper seat 3044 to fix the valve plate unit 3042 and the limit valve plate 3043, and improves reliability and durability. The fixing member 3041 can be designed by pressure riveting and anti-loosening, such as using a spring card.

[0105] The valve plate unit 3042 can be stacked by valve plates of different outer diameters and thicknesses. The stacking design is specifically based on the closing force requirements. It can be stacked into a cylindrical or pagoda structure. The elastic material design is selected based on comprehensive consideration of the functional materials.

[0106] The limiting valve disc 3043 provides assembly limitation for the valve disc unit 3042. The thickness and outer diameter of the limiting valve disc 3043 are designed to match the outer diameter and thickness of the valve disc unit 3042, and the material thereof is an elastic material.

[0107] The sealing element 3055 and the supporting seal 3033 are sealed with the inner wall of the component housing to achieve an isolation effect. During the process of fluid flowing into the pressure chamber, pressure leakage in the pressure chamber is avoided, which affects the stability of the damping force.

[0108] The support seal 3033 can be an O-ring. The upper end of the O-ring supports the spring plate 3031, and the lower end is placed on the support valve plate unit 3032. The outer side of the O-ring rests on the lower housing 302 and is sealed against the inner wall of the lower housing 302. The O-ring 3033 is made of an elastic material and has elastic deformation. It provides the balancing valve 305 with upward and downward movement. Through the material, hardness, and O-shaped structural design, it improves the linear change of the supporting force of the balancing valve 305 and transmits it to and increases the closing force of the control valve. The O-ring 3033 is made of an elastic material, which provides the increase and decrease of space due to elastic deformation during the process of pressure increase and decrease in the pressure chamber. The O-ring 3033 also cooperates with the lower housing 302 to provide sealing between the pressure chamber and the balancing chamber.

[0109] The outer side of the balancing valve 305 cooperates with the lower housing 302 to provide sealing between the pressure chamber and the balancing chamber, thereby meeting the pressure establishment requirements of the pressure chamber.

[0110] The upper end of the supporting valve plate unit 3032 supports the O-ring 3033, and the lower end leans against the lower shell 302. By changing the material, thickness and quantity design of the supporting valve plate unit 3032, the closing force of the control valve 304 is improved, further bringing about an increase or decrease in the damping force.

[0111] A fluid inlet channel 3052 is located in the center of the valve upper seat 3044. At least one oil outlet slit is located outside the valve upper seat 3044, and a fluid pressure buffer chamber is located at the bottom of the valve upper seat 3044. The valve upper seat 3044 is provided with a fluid inlet circulation channel in the form of a cylindrical hole (other shapes are also possible). The size and precision of the channel are controlled to ensure stable fluid flow and pressure buildup. An oil drain channel is designed at the lower end of the valve upper seat 3044 to achieve oil inflow and outflow circulation. The drain channel area must be comprehensively matched with the area of ​​the oil inlet channel 3052 of the valve upper seat 3044 and the oil hole area of ​​the balancing valve 305. Metal injection molding, powder metallurgy, or composite materials are used to combine structure and functionality.

[0112] The valve lower seat 3051 has at least one oil inlet channel 3052 and one oil outlet channel 3053 within its interior. The valve lower seat 3051 is designed with a cylindrical hole for the oil inlet flow channel. The size and precision of the channel ensure stable oil flow and pressure buildup.

[0113] The internal structure of the valve lower seat 3051 provides closure for the sealing elastic valve disc 3056 and the discharge valve disc 3057 to ensure their sealing performance.

[0114] The relief valve plate 3057 is configured as a throttle valve. The relief valve plate 3057 cooperates with the sealing elastic valve plate 3056 to ensure unidirectional flow of fluid during the extension or compression of the shock absorber. For example, it can prevent oil backflow during the extension of the shock absorber.

[0115] An assembly structure is provided on the outer side of the valve lower seat 3051 to provide a support for the valve plate 3054 and the sealing element 3055 to be assembled.

[0116] A leaning module is set inside the upper shell 301 to provide the mounting valve plate 3054 with a leaning for assembly. The leaning module at the upper shell 301 is set in a flat surface, with R angles set on the inner and outer sides, providing a smooth support point for the mounting valve plate 3054 and the sealing element 3055 to move up and down.

[0117] The sealing element 3055 rests on the mounting valve disc 3054 on the top, on the valve lower seat 3051 on the inside, and on the inner wall of the lower housing 302 on the outside. The sealing element 3055 provides sealing between the pressure chamber and the pressure relief chamber. The sealing element 3055 can be an elastic sealing element 3055.

[0118] The supporting valve plate unit 3032 is provided below the O-ring 3033 , and the O-ring 3033 provides sealing between the pressure chamber and the lower portion of the supporting valve plate unit 3032 .

[0119] A leaning module and a space changing module are provided inside the lower housing 302. The leaning module provides the supporting valve plate unit 3032 with a leaning position, and the space changing module provides a space for the supporting valve plate unit 3032 to deform due to pressure changes in the pressure chamber.

[0120] The lower shell 302 is provided with an exhaust / oil drain hole to provide a space for gas and oil to be discharged when the pressure change in the pressure chamber causes the support valve plate unit 3032 to deform.

[0121] The supporting valve plate unit 3032 includes at least four supporting plates, and the supporting plates are made of elastic material.

[0122] The FAD valve assembly 300 of the present invention is used as a component of a shock absorber. Figure 1 shows an embodiment of a shock absorber using the FAD valve assembly 300 of the present invention. The shock absorber includes a piston rod 100, a first support washer 200, an FAD valve assembly 300, an FAD inlet passage 400, a flow valve assembly 500, a piston assembly 600, a return valve assembly 700, and a second support washer 800. The FAD valve assembly and the piston assembly are connected, and the closing force of the FAD valve assembly is greater than the closing force of the piston assembly.

[0123] The piston assembly 600 is sheathed on the outer wall of the piston rod 100. The FAD valve assembly 300 is installed at the bottom end of the piston rod 100. The reset valve assembly 700 and the flow valve assembly 500 are respectively disposed within the piston assembly 600. The FAD inlet channel 400 runs through the piston rod 100 and is in fluid communication with the FAD valve assembly 300. The first support washer 200 is sheathed on the outer wall of the piston rod 100. The second support washer 800 is connected to the reset valve assembly 700 and is located within the piston assembly 600.

[0124] In this embodiment, the bottom end of the piston rod 100 is threadedly connected to the FAD valve assembly 300. The FAD inlet channel 400 located inside the piston rod 100 is connected using transverse and longitudinal through-holes. The transverse hole is used for oil flow control. The hole size is matched to the requirements of the damping system, and the cross-sectional area of ​​the hole increases linearly from the outer wall of the piston rod 100 inward. The longitudinal hole is designed for oil circulation. The longitudinal hole cross-sectional area is larger than the maximum cross-sectional area of ​​the transverse hole. At the same time, the longitudinal holes at the end of the piston rod 100 form a tapered structure, providing a larger space for oil flow, as well as pressure balance and stability. The outer wall of the bottom end of the piston rod 100 is threadedly fixed to the inner wall of the inlet of the FAD valve assembly 300. The threaded fixation ensures durability. The thread design can provide standard type, thread glue anti-loosening or self-locking anti-loosening design. The standardized thread length design ensures durability and reliability, considering the applicability of different vehicle models.

[0125] The restoring valve assembly 700 is used to provide restoring damping under low-frequency working conditions. Different valve plates with different materials, outer diameters and thicknesses form different restoring valve assemblies 700 to achieve different damping requirements to match the needs of different vehicle models. At the same time, the flat design and elastic material design at both ends of the restoring valve assembly 700 are used to ensure the sealing of the restoring end of the piston assembly 600.

[0126] The upper and lower parts of the piston assembly 600 are respectively supported by the circulation valve assembly 500 and the restoration valve assembly 700, which are used to provide compression damping and restoration damping under low-frequency working conditions. The hole and step difference design of different piston assemblies 600 can achieve different damping requirements; the structure adopts powder metallurgy and the periphery is plastic-coated with PTFE material to control the isolation and sealing of the upper and lower cavities.

[0127] When the restoration valve assembly 700 is open, one end of the second support washer 800 limits the opening height of the restoration valve assembly 700 to improve durability. Combined with functional requirements, the other end provides effective contact with the FAD valve assembly 300. The material used is hard powder metallurgy or stamping material.

[0128] When the circulation valve assembly 500 is open, the first support washer 200 limits the opening height of the circulation valve assembly 500 to improve durability. Based on functional requirements, the material used is hard powder metallurgy or stamping materials. The circulation valve assembly 500 is used to provide compression damping under low-frequency conditions. Different valve plates with different materials, outer diameters, and thicknesses form different circulation valve assemblies 500 to meet different damping requirements to match the needs of different vehicle models. At the same time, the flat design and elastic material design at both ends of the circulation valve assembly 500 ensure the sealing of the circulation end of the piston assembly 600.

[0129] By setting up the FAD valve group 300, the sealing element 3055 and the valve lower seat 3051 are supported by the support spring sheet 3031, and a suspended interference design is adopted to meet the sealing requirements while ensuring durability and support, thereby improving the durability and stability of the product.

[0130] In conjunction with the aforementioned shock absorber, the working principle and working process of the FAD valve group 300 are described in detail below.

[0131] The oil flow routes in the shock absorber include the Fd route, the Fd1 route, the Fd2 route, the Fd3 route, and the Fd4 route. The first fluid inflow channel 30444, the buffer chamber 30446, and the second fluid inflow channel 3052 constitute the Fd2 route, and the fluid flows from the fluid in the oil inlet channel 306 into the pressure chamber 307 via the Fd2 route. The fluid outflow channel 3053, the leakage gap 308, the pressure relief chamber 309, and the leakage hole 3013 constitute the Fd3 route, and the fluid in the pressure chamber 307 flows out of the valve group housing via the Fd3 route. The Fd4 route is the route in which, after the control valve 304 is opened, the fluid flows from the oil inlet channel 306 directly through the gap between the valve plate unit 3042 and the outlet edge of the valve group fluid inlet channel 306 into the pressure relief chamber 309 and finally flows out of the valve group housing via the leakage hole 3013.

[0132] In this embodiment, the working states of the shock absorber and the FAD valve assembly 300 are as follows:

[0133] Case 1: Low-frequency stretching and low internal transient pressure

[0134] When the shock absorber is in tension, the frequency is low and the internal transient pressure is low. The internal pressure is greater than the closing force of the piston assembly 600 and the restoring valve assembly 700, but less than the dynamic and static closing forces of the FAD valve assembly 300. The shock absorber oil flows through the Fd route. The oil flow in the Fd route generates a damping force through the piston assembly 600. The energy required by the damping system is primarily provided by the piston assembly 600, and the FAD valve assembly 300 is ineffective. Because the first fluid inflow channel 30444 and the second fluid inflow channel 3052 in the FAD valve assembly 300 are all normally through-hole designs, a small amount of oil may enter the fluid pathways. At this point, the oil flows through the Fd1 route into the FAD valve assembly 300, passes through the Fd2 route into the pressure chamber 307, and finally exits the FAD valve assembly 300 through the Fd3 route. Since the amount of oil entering the FAD valve assembly 300 at this point is minimal, the damping generated by this tiny amount of oil entering the FAD valve assembly 300 is also negligible, and is negligible relative to the overall damping requirements of the shock absorber. This means that the overall damping force of the shock absorber is not affected. The actual operating damping force of the shock absorber can be selected and designed based on the damping system requirements, i.e., low-frequency damping. This situation is merely a condition caused by the always-open flow path design of the FAD valve assembly 300 of the present invention. Since this tiny amount of damping is negligible, this condition is not the intended operating condition of the present invention.

[0135] Case 2: Low-frequency stretching and infinite internal pressure

[0136] When the shock absorber is in a low-frequency state during the extension process, but the operating speed and internal pressure are infinite (in actual application, this situation only occurs in extreme circumstances and rarely occurs), the internal pressure of the shock absorber exceeds the closing force of the piston assembly 600 and the restoring valve assembly 700, as well as the dynamic and static closing forces of the FAD valve assembly 300. A portion of the shock absorber oil flows through the Fd path of the piston assembly 600, where the oil flow in the Fd path generates a damping force through the piston assembly 600; another portion of the oil flows through the FAD valve assembly 300, generating a damping force. At this point, the oil flow path of the FAD valve assembly 300 is as follows: oil enters through the Fd1 path, the control valve 304 opens, and oil flows out through the Fd4 path. Meanwhile, some oil flows through the Fd2 path and finally out through the Fd3 path. In this case, the shock absorber operates at a very high speed, and this operating condition rarely occurs in actual application. This is only a theoretical extreme case and is not the operating condition targeted by the present invention.

[0137] Case 3: Low-frequency compression

[0138] When the shock absorber is in compression and at a low frequency, the FAD valve assembly 300 is inoperative. Due to the always-open oil circulation hole design of the FAD valve assembly 300, some oil will flow, reducing compression damping to a certain extent. However, this is a negligible and insignificant amount of damping and has no impact on the overall damping force of the shock absorber. At this point, the oil flow through the FAD valve assembly 300 is reversed from the Fd3 route into the FAD valve assembly 300, then reversed into the Fd2 route, and finally reversed out through the Fd1 route. This is merely a condition caused by the always-open flow design of the FAD valve assembly 300 of the present invention. Since this slight damping is negligible, this condition is not the intended operating condition of the present invention.

[0139] Case 4: High-frequency stretching

[0140] When the shock absorber is in a high-frequency extension process and experiences high internal transient pressure, the internal pressure exceeds the closing force of the piston assembly 600, the restoring valve assembly 700, and the dynamic closing force of the FAD valve assembly 300. In this situation, the piston assembly 600 and the FAD valve assembly 300 jointly provide damping force, i.e., high-frequency damping. A portion of the shock absorber's oil flows through the Fd route, where the oil flow passes through the piston assembly 600 and the restoring valve assembly 700 to generate damping force. Another portion of the shock absorber's oil flows through the Fd1 route, where the oil flow passes through the FAD valve assembly 300 to generate damping force. At this time, the oil flow route of the FAD valve group 300 is: the oil enters the FAD valve group 300 from the Fd1 route, and the shock absorber does not immediately switch to the high-frequency stretching state. There is a transition process from low frequency to high frequency. During this transition process, the pressure in the shock absorber cylinder and the pressure in the valve group fluid inlet channel 306 are also gradually established and increased. At the initial stage of pressure establishment in the valve group fluid inlet channel 306, the pressure is less than the initial closing force of the control valve 304 provided by the preload force, and the Fd2 route is a normally through-hole design. The oil enters the Fd2 route from the Fd1 route, and the oil then enters the pressure chamber through the Fd2 route. The pressure in the pressure chamber begins to build up, and the pressure in the pressure chamber also provides closing force for the control valve 304. After the shock absorber enters the high-frequency tension state, the pressure within the shock absorber cylinder or within the valve assembly fluid inlet channel 306 increases and builds faster than the pressure within the pressure chamber. When the oil pressure within the valve assembly fluid inlet channel 306 exceeds the sum of the closing force provided by the preload and the pressure chamber pressure, the oil pressure within the valve assembly fluid inlet channel 306 pushes the control valve 304 downward, opening the gap between the outlet of the valve assembly fluid inlet channel 306 and the valve plate unit 3042, allowing some of the oil in the valve assembly fluid inlet channel 306 to flow out via the Fd4 route. After the Fd4 route opens, another portion of the oil in the valve assembly fluid inlet channel 306 continues to enter the pressure chamber via the Fd2 route, gradually increasing the pressure in the pressure chamber. The pressure within the pressure chamber continues to provide closing force for the control valve 304, gradually increasing the closing force on the control valve 304 and further controlling the opening height of the FAD valve assembly 300. During this process, the oil in the pressure chamber flows out via the Fd3 route. This high-frequency tension state is the operating condition targeted by the present invention.

[0141] Under high-frequency conditions, when the FAD valve group is working, the control valve 304 moves downward, and the balancing valve 305 also tends to move downward, providing a smooth support point for the mounting valve disc and the sealing element of the balancing valve facing downward; ultimately, a smooth support point feature is formed that moves up and down during the working process of the balancing valve. At the same time, the mounting valve disc and the lower end of the sealing element of the balancing valve are designed to be suspended (not connected to the movable valve), and the deformation of the components themselves during up and down movement does not affect the closing force of the FAD valve.

[0142] The control valve 304 and the balancing valve 305 move downward, causing the spring sheet 3031 to deform downward, thereby providing displacement space for the control valve 304 and the balancing valve 305 to move downward.

[0143] When the pressure in the pressure chamber increases to a certain value, the supporting valve plate unit 3032 deforms downward, thereby adjusting the size of the pressure chamber and balancing the pressure.

[0144] The FAD valve group 300 can be selected and designed according to the working pressure and frequency of the valve group 300 in combination with the system requirements.

[0145] Case 5: High-Frequency Compression

[0146] When the shock absorber is in the high-frequency compression stage, the FAD valve assembly 300 is inoperative. Due to the FAD valve assembly 300's normally open oil circulation design, some oil will circulate within the FAD valve assembly 300, reducing compression damping to a certain extent. However, this is a negligible amount of damping and has no impact on the shock absorber's overall damping force. At this point, the oil flow path within the FAD valve assembly 300 is as follows: it flows backward from the Fd3 path into the FAD valve assembly 300, then back into the Fd2 path, and finally flows out of the FAD valve assembly 300 through the Fd1 path.

[0147] As an embodiment, the FAD valve assembly 300 is in communication with the piston assembly 600 , and the closing force strength of the FAD valve assembly 300 is greater than the closing force strength of the piston assembly 600 .

[0148] As an embodiment, the upper shell 301 and the lower shell 302 can be connected by welding or by threading.

[0149] As an implementation manner, the upper shell 301 is made of powder metallurgy material, and may also be made of metal injection material.

[0150] The valve upper seat 3044 is provided with a leaning module and an elastic deformation space module, providing a leaning and elastic deformation space for the limiting valve plate 3043, the valve plate unit 3042 and the spring card 3041 to lean in sequence.

[0151] The valve upper seat 3044 is made of any one of powder metallurgy, composite materials and metal injection materials.

[0152] The valve plate unit 3042 and the spring card 3041 are made of elastic material.

[0153] The material of the discharge valve plate 3057 and the sealing elastic valve plate 3056 is elastic material.

[0154] The valve lower seat 3051 is made of any one of powder metallurgy, composite materials and metal injection materials.

[0155] The supporting valve plate unit 3032 is made of an elastic material, which has elasticity.

[0156] The spring sheet 3031 and the mounting valve sheet 3054 are made of elastic material and thus have elasticity.

[0157] The lower housing 302 is deep-drawn to provide torque fastening for the FAD valve assembly 300 and support the valve train assembly.

[0158] The present invention increases the sealing structure design, and the sealing element 3055 achieves an isolation effect, avoiding pressure leakage during the pressure building process, which affects the stability of the damping force; at the same time, the upper shell and the lower shell are assembled in a controlled preload manner during the assembly process, and the accumulated tolerances of components are eliminated by setting the preload, thereby improving the stability of the damping force and providing an initial closing force under the preload; the first fluid inflow channel 30444 of the valve upper seat adopts a flow hole design, and a buffer cavity is added to improve the stability of the system. The design of this structure also meets the mold forming solutions of powder metallurgy and composite materials; the second fluid inflow channel 3052 of the valve lower seat is used as a pressure flow control hole with high precision requirements. It is designed as a short hole and a mold forming solution to improve product stability; to avoid the problem of durable attenuation of the support spring sheet in the existing technical solution, the sealing element and the valve lower seat are groove-mounted and suspended interference-designed, and do not contact the movable valve below, meeting the sealing requirements while ensuring durability and support, thereby improving the durability and stability of the product.

[0159] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of the rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

[0160] In this application, the terms "including," "comprising," "comprising," and similar terms are defined as "including," unless otherwise specifically stated. In addition, in view of the teachings of the present application, the terms used in the above description are defined herein to include similar and / or equivalent terms, and / or alternative embodiments are deemed to be obvious to those skilled in the art in view of the teachings of the present application.

Claims

1. A frequency adaptive damping valve assembly, characterized in that: include: a housing having an inlet port adapted for fluid connection to the first pressure chamber (306) and an outlet port (3013) adapted for fluid connection to the second pressure chamber (307); a valve member biased against the first pressure chamber 306 outlet edge 3012 and arranged to allow fluid to flow from the inlet port to the outlet port 3013 directly via an open gap (Fd4) between the outlet edge 3012 and the valve member when the pressure in the first pressure chamber 306 exceeds a certain opening pressure; The second pressure chamber (307) is a variable volume pressure chamber, which is fluidically connected to the first pressure chamber 306 via a fluid inflow channel and fluidically connected to the outlet port (3013) via a fluid outflow channel; The second pressure chamber (307) is delimited by a flexible annular sealing element (3055) on the side facing the first pressure chamber (306), and the valve member has a supporting portion, which penetrates the sealing element (3055) and is supported on a supporting structure (3031) in the second pressure chamber 307; The supporting portion has a first bonding surface (30514) that is sealingly engaged with the upper end face of the sealing element (3055), and a second bonding surface (30515) that is sealingly engaged with the lower end face of the sealing element (3055), and the sealing element (3055) is mounted on the supporting portion by the first bonding surface (30514) and the second bonding surface (30515) so as to bias the valve member toward the first pressure chamber (306) by a force depending on the pressure in the second pressure chamber (307).

2. The frequency adaptive damping valve assembly according to claim 1, characterized in that: The inner hole diameter of the sealing element (3055) is smaller than the outer diameter of the supporting portion that cooperates with the inner hole of the sealing element (3055), and the outer diameter of the sealing element (3055) is larger than the inner diameter of the shell that seals with the sealing element (3055).

3. The frequency adaptive damping valve assembly according to claim 1, characterized in that: A convex bump (30513) extends downward from the edge of the lower end surface of the sealing element (3055).

4. The frequency adaptive damping valve assembly according to claim 1, characterized in that: The second pressure chamber (307) is defined by a supporting valve plate unit (3032) on the side facing the bottom of the housing.

5. The frequency adaptive damping valve assembly according to claim 1, characterized in that: The valve component comprises an upper valve seat (3044) and a lower valve seat (3051); The valve upper seat (3044) is formed with a regular through hole as a first fluid inflow channel (30444); the valve lower seat (3051) is formed with a regular through hole as a second fluid inflow channel (3052); the first fluid inflow channel (30444) and the second fluid inflow channel (3052) constitute the fluid inflow channel part of the Tao; The cross-sectional area of ​​the second fluid inflow channel (3052) is smaller than the cross-sectional area of ​​the first fluid inflow channel (30444).

6. The frequency adaptive damping valve assembly according to claim 5, characterized in that: The body of the valve upper seat (3044) extends downward to form a buffer cavity forming portion (30443); a buffer cavity (30446) is formed inside the buffer cavity forming portion (30443); the buffer cavity (30446) is located between the first fluid inflow channel (30444) and the second fluid inflow channel (3052), and the fluids are interconnected.

7. The frequency adaptive damping valve assembly according to claim 6, characterized in that: The buffer chamber forming portion (30443) is sealed and matched with the valve lower seat (3051), and the valve lower seat (3051) forms a sealed and slidable fit with the inner wall of the shell through the sealing element (3055).

8. The frequency adaptive damping valve assembly according to claim 6, characterized in that: The bottom of the buffer cavity is an open structure, and the open edge (30445) of the buffer cavity forming portion (30443) is placed on the body of the valve lower seat (3051), and a seal is provided between the open edge (30445) and the body of the valve lower seat (3051).

9. The frequency adaptive damping valve assembly according to claim 1, characterized in that: The valve component also includes a mounting valve plate (3054), and the supporting portion is provided with a boss on the side facing the first pressure chamber 306, and the mounting valve plate (3054) is mounted on the boss, and at least a portion of the upper end surface of the mounting valve plate (3054) abuts against the valve component body, and the lower end surface of the mounting valve plate (3054) and the boss end surface jointly serve as the first joint surface (30514) and are sealingly engaged with the sealing element (3055).

10. The frequency adaptive damping valve assembly according to claim 9, characterized in that: A limit support portion (3011) is provided on the side wall of the shell, and the upper end surface of the mounting valve plate (3054) is abutted against the limit support portion (3011).

11. The frequency adaptive damping valve assembly according to claim 10, characterized in that: The end surface of the position-limiting support portion (3011) that cooperates with the mounting valve plate (3054) is a planar structure, and the side of the position-limiting support portion (3011) facing the internal space of the shell is arranged as an R-angle structure.

12. The frequency adaptive damping valve assembly according to claim 10, characterized in that: The position-limiting support portion (3011) is arranged on the end surface of the portion of the upper shell (301) extending into the lower shell (302).

13. The frequency adaptive damping valve assembly according to claim 5, characterized in that: The valve lower seat (3051) body is also provided with a regular through hole serving as a fluid outflow channel (3053); the inlet of the fluid outflow channel (3053) is fluidically connected to the pressure chamber (307), and the outlet of the fluid outflow channel (3053) is fluidically connected to the outlet port (3013) via a fluid flow channel.

14. The frequency adaptive damping valve assembly according to claim 13, characterized in that: The valve lower seat (3051) is formed with an installation space (30511) adapted to the buffer cavity forming part (30443) for placing the buffer cavity forming part (30443); the open edge (30445) of the buffer cavity forming part (30443) is arranged on the body of the valve lower seat (3051); and a leakage gap (308) is formed between the outer wall of the buffer cavity forming part (30443) and the valve lower seat (3051).

15. The frequency adaptive damping valve assembly according to claim 14, characterized in that: The outlet of the fluid outflow channel (3053) is in fluid communication with the leakage gap (308), and the leakage gap (308) is in fluid communication with the outlet port (3013) via a fluid flow channel.

16. The frequency adaptive damping valve assembly according to claim 15, characterized in that: A pressure relief chamber (309) is formed between the valve upper seat (3044), the valve lower seat (3051), the mounting valve plate (3054) and the inner wall of the shell, and the pressure relief chamber (309) leads to the outside of the valve assembly shell through the outlet port (3013); the leakage gap (308) extends from the gap between the valve lower seat (3051) and the valve upper seat (3044) to the pressure relief chamber (309) and is fluidically connected.

17. The frequency adaptive damping valve assembly according to claim 8, characterized in that: A sealing elastic valve sheet (3056) is provided between the buffer cavity forming portion (30443) and the valve lower seat (3051) to form a sealing fit; the outlet of the fluid outflow channel (3053) is located outside the edge of the sealing elastic valve sheet (3056).

18. The frequency adaptive damping valve assembly according to claim 8, characterized in that: A sealing elastic valve plate (3056) is arranged between the buffer cavity forming portion (30443) and the valve lower seat (3051) to form a sealing fit; the outlet of the fluid outflow channel (3053) is located on the inner side of the edge of the sealing elastic valve plate (3056), and a leakage valve plate (3057) is arranged at the outlet of the fluid outflow channel (3053) to connect the leakage gap (308) with the fluid.

19. The frequency adaptive damping valve assembly according to claim 18, characterized in that: The discharge valve plate (3057) is a throttle valve plate.

20. The frequency adaptive damping valve assembly of claim 18, wherein: The leakage valve plate (3057) is provided with a notch or a slit. The leakage valve plate (3057) is located between the outlet of the fluid outflow channel (3053) and the sealing elastic valve plate (3056). The fluid flows into the leakage slit (308) through the notch or the slit.

21. The frequency adaptive damping valve assembly of claim 1, wherein: The valve component also includes a supporting valve plate unit (3032) and a supporting seal (3033); the supporting valve plate unit (3032) is arranged at the bottom of the shell, and the supporting seal (3033) is placed on the supporting valve plate unit (3032); the supporting valve plate unit (3032) is sealed with the inner wall of the shell by means of the supporting seal (3033), and the supporting structure (3031) and the supporting seal (3033) can move along the inner wall of the shell; the supporting structure (3031) is arranged on the supporting seal (3033), and the valve lower seat (3051) is arranged on the supporting structure (3031).

22. The frequency adaptive damping valve assembly of claim 21, wherein: The support structure (3031) is a spring sheet, and the spring sheet (3031) is provided with a connecting hole (30311) connecting the upper and lower sides, and the spaces on the upper and lower sides of the spring sheet (3031) are connected through the connecting hole (30311).

23. A shock absorber, characterized in that: The frequency adaptive damping valve assembly comprises the frequency adaptive damping valve assembly as claimed in any one of claims 1 to 22, wherein a fluid inlet passage in the shock absorber piston rod is in fluid communication with an inlet port of the first pressure chamber (306).

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