FAD valve group and shock absorber using same

Abstract

The invention provides an FAD valve bank. A control valve, a balance valve and a pressure cavity are arranged in a valve bank shell. A normally-open first fluid inflow channel and a buffer cavity are formed between an outlet of the valve group fluid inlet channel and the interior of the control valve; a normally-open second fluid inflow channel is formed in the balance valve. The second fluid inflow channel is in fluid communication with the pressure cavity; the sectional area of the second fluid inflow channel is smaller than that of the first fluid inflow channel; in the process that fluid flows into the pressure cavity along the fluid inflow path, after the fluid pressure in the valve bank fluid inlet channel is larger than closing force, the control valve moves downwards, a gap between an outlet of the valve bank fluid inlet channel and the control valve is opened, and a drainage flow path is established. The pressure and damping establishment is stable, the control precision is high, the stability is good, and the durability is high.

Description

Technical Field

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

[0002] The damper or shock absorber is an important component of the vehicle chassis driving system. It connects the vehicle's sprung and unsprung masses and improves driving and riding comfort by attenuating road excitation vibrations through the design of damping force. The FAD damping characteristic is a frequency adaptive damping valve system, which combines different road excitation frequencies to adapt to different damping characteristics, decomposes the sprung and unsprung frequencies, and greatly improves vehicle driving comfort. The patent with 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 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. It will also produce powder due to friction, affecting flow cleanliness and even blocking leakage. (2) The valve stem of the controlled valve is connected to the second valve body. There is an oil flow hole on the side of the valve stem. The size of the hole affects the size of the high-frequency damping force. The difficulty of machining the side hole of the valve stem and the clearance with other parts will cumulatively affect the size of the side hole and affect the stability of the damping force. (3) The spacer element affects the damping force and the adjustment range. The spacer element connects 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 is a rigid material, the damping force stability changes due to the change in the through-hole area during the compression process of the spacer element. The material increases the stiffness of the valve system and reduces the high-frequency damping force range, which is not conducive to the adjustment of the high-frequency damping force; (4) an oil flow hole is opened at the lower end of the valve housing, and most of the fluid flows in from the upper inlet side and flows out from the lower outlet side. This design affects the compression damping force. During the compression process, the valve is affected by the compression damping, and there will be a certain opening space in the valve, resulting in oil leakage, affecting the compression flow and damping force; (5) 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, and the flow channel cross-section and flow are difficult to control, and the control accuracy is low. In addition, due to the 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 cooperation of the second movable valve body part, the valve plate unit and the first movable valve body part. There are many components, which is easy to 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 FAD valve assembly and a shock absorber using the same.

[0004] To achieve the above-mentioned purpose, the present invention provides a FAD valve group, including a valve group housing and a valve group fluid inlet channel, wherein a control valve and a balancing valve are arranged inside the housing; the control valve includes a valve upper seat; the body of the valve upper seat extends upward to form a rod-shaped mounting portion, and the body of the valve upper seat extends downward to form a buffer cavity forming portion; a permanent through hole is formed inside the rod-shaped mounting portion along the length direction as a first fluid inflow channel; a buffer cavity is formed inside the buffer cavity forming portion; the buffer cavity is fluidically connected with the first fluid inflow channel; the balancing valve includes a valve lower seat and a sealing element; the valve lower seat body is provided with a permanent through hole as a second fluid inflow channel; the valve lower seat forms a seal and relatively slidable fit with the inner wall of the housing through the sealing element; the control valve is arranged on the balancing valve, wherein the buffer cavity forming portion is sealed with the valve lower seat, and the inlet of the second fluid inflow channel is fluidically connected with the buffer cavity; the cross-sectional area of ​​the second fluid inflow channel is smaller than the cross-sectional area of ​​the first fluid inflow channel. Since the fluid inflow channel is a permanent through hole arranged on the valve seat, the cross-sectional area and pressure of the fluid inflow channel can be conveniently and accurately controlled without accumulating tolerances. Since the buffer chamber is provided in the flow channel, when the fluid flows in and the pressure is built up, the pressure builds up more smoothly without large fluctuations, thereby improving the controllability and stability of the damping.

[0005] As an implementation method, the cross-sectional area of ​​the valve group fluid inlet channel is larger than the cross-sectional area of ​​the first fluid inlet channel. In this way, the valve group fluid inlet channel can also play the role of buffering fluid in the inlet channel, and the pressure is built up more smoothly without large fluctuations, thereby improving the controllability and stability of the damping.

[0006] As an embodiment, the control valve further includes a valve plate unit, which is mounted on a rod-shaped mounting portion; the gap between the outlet of the fluid inlet channel of the valve group and the valve plate unit is sealed under the closing force exerted on the control valve; when the fluid pressure in the fluid inlet channel of the valve group is greater than the closing force, the control valve moves downward, and the gap between the outlet of the fluid inlet channel of the valve group and the valve plate unit is opened and a leakage flow path is established. Since the fluid inflow channel is a normally open hole, and the control valve is opened only after the fluid pressure in the fluid inlet channel of the valve group is greater than the closing force, the fluid first flows into the pressure chamber to establish pressure. In this way, the pressure in the pressure chamber is established quickly, the opening and closing boundaries of the control valve and the leakage flow path Fd4 are obvious, and the opening frequency control precision is higher and more accurate.

[0007] As an implementation mode, the outlet of the fluid inlet passage of the valve group extends toward the inside of the housing until it forms a matching relationship with the valve plate unit in the control valve, thereby simplifying the valve group structure.

[0008] As an embodiment, the control valve further comprises a limit valve disc, the limit valve disc is mounted on the mounting surface of the valve upper seat, and the valve disc unit is mounted on the limit valve disc. The limit valve disc provides a mounting position for the valve disc unit and limits the deformation of the valve disc unit.

[0009] As an embodiment, the control valve further includes a fixing component; the valve plate unit and the limit valve plate are fixed on the rod-shaped mounting portion by the fixing component. Preferably, the fixing component is a spring card or a nut; the spring card is clamped on the rod-shaped mounting portion and presses against the valve plate unit.

[0010] As an implementation manner, the outer shape of the buffer chamber forming portion may be cylindrical or eccentric cylindrical, thereby forming a leakage gap with the lower valve seat.

[0011] As an implementation mode, the buffer cavity is conical or cylindrical. Preferably, the bottom of the conical or cylindrical buffer cavity is an open structure.

[0012] As an implementation mode, 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 to prevent fluid leakage in the buffer cavity and affect pressure establishment.

[0013] As an implementation manner, a pressure chamber is provided in the valve group housing space below the balancing valve, and the outlet of the second fluid inflow channel is fluidically connected to the pressure chamber. The pressure chamber is used for pressure establishment.

[0014] As an embodiment, the balancing valve further comprises a mounting valve disc, the outer side wall of the valve lower seat forms a circle of grooves, the mounting valve disc and the sealing element are clamped in the grooves; the lower end surface of the sealing element is suspended, thus avoiding the nonlinear increase of load in the prior art.

[0015] As an implementation mode, a limiting support portion is provided on the side wall of the valve group housing, the upper end surface of the mounting valve plate abuts against the limiting support portion, and the sealing element is limited by the lower end surface of the mounting valve plate; a convex bump extends downward from the edge of the lower end surface of the sealing element.

[0016] As an embodiment, the end surface of the position limiting support part is a plane, which cooperates with the upper end surface of the mounting valve disc to limit the mounting valve disc. The corners of the position limiting support part facing the inner space of the shell are set as R angle structures, and the corners of the position limiting support part provide smooth support points for mounting the valve disc.

[0017] As an implementation manner, the position-limiting support portion is arranged on a side of the upper shell extending into the inner wall of the lower shell.

[0018] 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 fluidly connected to the pressure chamber, and the outlet of the fluid outflow channel leads to the outside of the valve group housing via a fluid flow channel.

[0019] 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; on the main body of the open edge of the buffer cavity forming part; an outlet of a leakage gap formed between the outer wall of the buffer cavity forming part and the valve lower seat is fluidically connected to the leakage gap, and the leakage gap leads to the outside of the valve group shell via a fluid flow channel.

[0020] As an implementation mode, a pressure relief chamber is formed between the balancing valve, the control valve and the inner wall of the shell, and the pressure relief chamber leads to the outside of the valve group shell through a leakage hole arranged on the valve group shell; 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.

[0021] As an implementation mode, the gap between the outlet of the fluid inlet channel of the valve group and the valve plate unit is sealed under the closing force applied to the control valve; when the fluid pressure in the fluid inlet channel of the valve group is greater than the closing force, the control valve moves downward, and the gap between the outlet of the fluid inlet channel of the valve group and the valve plate unit opens and is connected to the fluid of the pressure relief chamber, thereby establishing a leakage flow path.

[0022] As an implementation manner, a sealing elastic valve sheet is arranged between the buffer cavity forming portion and the valve lower seat to form a sealing fit; and the outlet of the fluid outflow channel is located outside the edge of the sealing elastic valve sheet.

[0023] As an implementation manner, an outlet of a sealing elastic valve plate is provided between the buffer cavity forming portion and the valve lower seat, and a leakage valve plate is provided at the outlet of the sealing elastic valve plate to fluidically connect the leakage gap.

[0024] As an implementation manner, the discharge valve plate is a throttle valve plate.

[0025] As an implementation manner, 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.

[0026] As an implementation mode, a limiting boss or limiting groove is provided on the valve lower seat around the inlet position at the upper end of the second fluid inflow channel; the sealing elastic valve plate and the discharge valve plate are mounted on the limiting boss or placed in the limiting groove.

[0027] As an implementation manner, the inlet of the fluid outflow channel is located on the side of the valve lower seat body, so that the fluid flows out of the channel into the space above the spring sheet.

[0028] As an implementation manner, the inlet of the fluid outflow channel is located at the bottom of the valve lower seat body, so that the inlet of the fluid outflow channel is located in the space below the spring sheet in the pressure chamber.

[0029] As an embodiment, a movable valve is further included, wherein the movable valve is used to support the balancing valve and provide a closing force to the control valve.

[0030] As an embodiment, the movable valve includes a supporting valve plate unit, a supporting seal and a spring plate; the supporting valve plate unit is arranged at the bottom of the shell, 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 spring plate and the supporting seal can move along the inner wall of the shell; the spring plate is arranged on the supporting seal, and the valve lower seat is arranged on the spring plate.

[0031] As an implementation manner, the spring sheet is provided with a connecting hole connecting the upper and lower sides, through which the spaces on the upper and lower sides of the spring sheet are connected, and the space between the valve lower seat and the supporting valve sheet unit serves as a pressure chamber.

[0032] As an implementation manner, the spring sheet is provided with a valve lower seat mounting hole, and the bottom of the valve lower seat body is adapted to the mounting hole, so that the spring sheet provides mounting support for the valve lower seat.

[0033] As an implementation manner, the supporting seal is an O-ring.

[0034] As an embodiment, the supporting seal has an elastic deformation function.

[0035] As an embodiment, the supporting valve sheet unit is arranged on the supporting part at the bottom of the shell, the bottom of the shell is concave, or the installation position of the supporting valve sheet unit is a certain distance away from the bottom of the shell, thereby forming a certain space under the supporting valve sheet unit as a accommodating space when the supporting valve sheet unit is deformed.

[0036] As an implementation mode, before a certain pressure is established in the pressure chamber, the closing force applied to the control valve is provided by the assembly preload force of the spring sheet; after a certain pressure is established in the pressure chamber, the closing force applied to the control valve is provided by both the assembly preload force of the spring sheet and the pressure established in the pressure chamber.

[0037] The present invention also provides a FAD valve group, including a valve group housing and a valve group fluid inlet channel, wherein a control valve, a balancing valve and a pressure chamber are arranged inside the valve group housing; a first fluid inflow channel and a buffer chamber that are normally open are formed inside the control valve; a second fluid inflow channel that is normally open is formed inside the balancing valve; the second fluid inflow channel is fluidically connected to the pressure chamber; the cross-sectional area of ​​the second fluid inflow channel is smaller than the cross-sectional area of ​​the first fluid inflow channel; the first fluid inflow channel, the buffer chamber and the second fluid inflow channel are fluidically connected in sequence to form a fluid inflow path Fd2 for the fluid to flow into the pressure chamber.

[0038] As an implementation mode, the gap between the outlet of the fluid inlet channel of the valve group and the control valve is sealed under the action of the closing force exerted on the control valve; in the process of the fluid flowing into the pressure chamber along the fluid inlet path, when the fluid pressure in the fluid inlet channel of the valve group is greater than the closing force, the control valve moves downward, and the gap between the outlet of the fluid inlet channel of the valve group and the control valve opens to establish a leakage flow path Fd4.

[0039] As an implementation manner, the cross-sectional area of ​​the buffer cavity is larger than the cross-sectional area of ​​the first fluid inflow channel.

[0040] As an implementation manner, the buffer cavity is conical or cylindrical.

[0041] As an implementation mode, a pressure relief chamber is further provided inside the valve group housing, and the pressure relief chamber is fluidically connected to the outside of the valve group housing.

[0042] As an implementation mode, the outlet of the fluid inlet channel of the valve group and the gap between the control valve are connected to the pressure relief chamber fluid after opening, and part of the fluid in the fluid inlet channel of the valve group flows into the pressure relief chamber through the gap after opening. The pressure relief chamber and the passage connecting the pressure relief chamber with the external fluid of the valve group housing are the leakage flow path, and a normally open fluid outflow channel is also provided as the fluid outflow flow path.

[0043] As an embodiment, the fluid outflow channel is connected to the pressure relief chamber fluid, and the fluid in the pressure chamber enters the pressure relief chamber via the fluid outflow channel. The pressure relief chamber and the passage connecting the pressure relief chamber with the external fluid of the valve group housing are part of the fluid outflow path Fd3.

[0044] As an embodiment, a leakage gap is formed between the balancing valve and the control valve, the leakage gap fluid connects the pressure relief chamber and the fluid outflow channel, and the leakage gap is a part of the fluid outflow path.

[0045] As an embodiment, it also includes a spring sheet located inside the valve group housing; the balancing valve is arranged on the spring sheet, and the control valve is arranged on the balancing valve. The spring sheet provides supporting force for the balancing valve and the control valve 4, and the assembly preload force of the spring sheet also provides an initial closing force for the control valve.

[0046] As an implementation mode, the balancing valve is sealed and relatively slidably matched with the inner wall of the valve group housing, and the lower cavity of the balancing valve forms a pressure chamber.

[0047] As an embodiment, a movable valve is also provided inside the shell; the movable valve is composed of a supporting valve sheet unit, a supporting seal and the spring sheet; the supporting valve sheet unit is provided at the bottom of the valve group shell, the supporting seal is placed on the supporting valve sheet unit, the supporting valve sheet unit is sealed with the inner wall of the shell by means of the supporting seal, and the spring sheet and the supporting seal can move along the inner wall of the shell; the spring sheet is provided on the supporting seal, and the valve lower seat is provided on the spring sheet; the assembly preload force of the spring sheet provides an initial closing force for the control valve.

[0048] As an implementation mode, before a certain pressure is established in the pressure chamber, the closing force applied to the control valve is provided by the assembly preload force of the spring sheet; after a certain pressure is established in the pressure chamber, the closing force applied to the control valve is provided by both the assembly preload force of the spring sheet and the pressure established in the pressure chamber.

[0049] The present invention also provides a shock absorber, comprising any one of the aforementioned FAD valve groups, wherein a fluid inlet channel in the shock absorber piston rod is fluidically connected to a fluid inlet channel of the valve group.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] (1) The fluid inflow channel is formed by the through holes on the upper and lower valve seats, which does not require the coordination of multiple parts and does not accumulate tolerances. At the same time, the 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.

[0052] (2) In the prior art, the side gap of the valve stem forms a flow channel, and its flow cross-sectional area is difficult to accurately control 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. The setting and control are highly precise, further improving the damping stability and controllability.

[0053] (3) 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.

[0054] (4) 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 that the pressure in the pressure chamber establishes quickly. When the shock absorber enters the high-frequency stretching 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.

[0055] (5) Since the flow path Fd2 is designed as a normal 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 matching relationship 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 matching relationship. 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. The pressure in the pressure chamber can be further accurately controlled, and the closing force of the control valve can be accurately controlled. The opening frequency control accuracy of the FAD valve group is higher and more accurate.

[0056] (6) The sealing element is fixed by a groove, and its lower end face is suspended in the air without contacting other components below it. The present invention also eliminates the installation spring supporting the sealing element in the prior art, thereby avoiding nonlinear increase in load during pressure building and avoiding friction with the shell, preventing component damage and improving stability and durability.

[0057] 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

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0059] Figure 1 It is a schematic diagram of the structure of the shock absorber of the present invention.

[0060] Figure 2 It is a schematic diagram of the structure of the FAD valve group of the present invention.

[0061] Figure 3It is a structural schematic diagram of the control valve in the present invention.

[0062] Figure 4 It is a structural schematic diagram of the balancing valve in the present invention.

[0063] Figure 5 It is an enlarged schematic diagram of the sealing element in the balancing valve.

[0064] Figure 6 It is a schematic diagram of the assembly of the control valve and the balancing valve in the present invention.

[0065] Figure 7 It is an enlarged schematic diagram of the seal cooperation in the assembly of the control valve and the balancing valve in the present invention.

[0066] Figure 8 It is a schematic diagram of the assembly of the movable valve and the balancing valve in the present invention.

[0067] Fig. 9 It is a schematic diagram of the pressure relief chamber and the front and rear flow passages in the present invention.

[0068] Fig.10 It is a schematic diagram of the fluid flow path of an embodiment of the shock absorber of the present invention.

[0069] Fig.11 yes Fig.10 Enlarged schematic diagram of the fluid flow path of the FAD valve group.

[0070] Fig.12 It is a schematic diagram of the fluid flow path of another embodiment of the shock absorber of the present invention.

[0071] Fig.13 yes Fig.12 Enlarged schematic diagram of the fluid flow path of the FAD valve group.

[0072] 100-piston rod, 200-first support washer, 300-FAD valve assembly, 301-upper housing, 302-lower housing, 303-movable valve, 304-control valve, 305-balance valve, 306-FAD valve oil inlet channel, 400-FAD inlet channel, 500-circulation valve assembly, 600-piston assembly, 700-recovery valve assembly, 800-second support washer, 3031-spring sheet, 30311-connecting hole, 3032-support valve sheet 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 bulge, 3052-second fluid inflow channel, 3053-fluid outflow channel, 3054-installation 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-balance chamber, 3021-discharge port, 3011-limiting support portion, 3012-matching portion, 3013-leakage hole. DETAILED DESCRIPTION

[0073] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can imagine various embodiments 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 a limitation or limitation 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 accompanying 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.

[0074] like Figure 2 As shown, the FAD valve group 300 of the present invention includes a component housing, a control valve 304, a balance valve 305, and a movable valve 303 arranged inside the housing.

[0075] In order to facilitate the assembly of the components inside the housing, the housing is a combined housing. For example, in this embodiment, the component housing can be divided into an upper housing 301 and a lower housing 302. The upper housing 301 and the lower housing 302 are adapted and assembled to form an internal installation space. The component housing is configured as an upper housing 301 and a lower housing 302, mainly to facilitate the installation of other components located inside the housing. In some cases, the upper housing 301 can be formed by the end of the shock absorber piston rod. Therefore, Figure 1 The division of the upper housing 301 and the lower housing 302 shown in the figure is only an example. In the case where other structures or component installation and settings can be realized, the division and matching of the component housing are not limited. Figure 1 shown.

[0076] like Figure 2 As shown, a valve group fluid inlet channel 306 is provided at the upper end of the housing. Figure 1 As shown, the valve group fluid inlet channel 306 is in fluid communication with the FAD inlet channel 400 disposed in the shock absorber valve stem. The fluid enters the FAD valve group 300 from the valve group fluid inlet channel 306. Figure 2 In the illustrated embodiment, the valve group fluid inlet passage 306 is disposed on the upper housing 301 .

[0077] like Figure 2 and Figure 3 As shown, the control valve 304 includes a valve upper seat 3044 , a limit valve plate 3043 , a valve plate unit 3042 and a fixing component 3041 .

[0078] The valve upper seat 3044 includes a mounting surface 30441 extending from the center to the edge, and the body of the valve upper seat 3044 extends upward from the mounting surface 30441 to form a rod-shaped mounting portion 30442. The rod-shaped mounting portion 30442 is hollow, and a constant through hole penetrating the rod-shaped mounting portion 30442 is formed in the length direction of the rod-shaped mounting portion 30442, and the constant through hole serves as the first fluid inflow channel 30444. The body of the valve upper seat 3044 extends downward from the mounting surface 30441 to form a buffer cavity forming portion 30445, and the internal space of the buffer cavity forming portion 30445 serves as a buffer cavity 30446, and the lower edge 30445 of the buffer cavity forming portion 30445 is open and has an open structure. The 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 group housing. The top inlet of the buffer cavity 30446 is in fluid communication with the outlet fluid at the lower end of the first fluid inflow channel 30444, and the lower part of the buffer cavity 30446 is an open, open structure. Specifically, the outer shape of the buffer cavity forming portion 30443 can be cylindrical or eccentric cylindrical. The buffer cavity 30446 located inside the buffer cavity forming portion 30443 can be a conical or columnar or substantially columnar cavity. Figure 2As shown, the buffer cavity 30446 is conical, the top of the cone is connected to the outlet fluid at the lower end of the first fluid inflow channel 30444, and the bottom of the cone is open. From the top of the cone to the bottom of the cone, the cross-sectional area of ​​the buffer cavity gradually increases and is larger than the cross-sectional area of ​​the first fluid inflow channel 30444. Figure 3 and Figure 6 As shown, the buffer cavity 30446 is roughly cylindrical, and the diameter of the buffer cavity 30446 is larger than the diameter of the first fluid inflow channel 30444, or the cross-sectional area of ​​the buffer cavity is larger than the cross-sectional area of ​​the first fluid inflow channel 30444. After the fluid enters the buffer cavity 30446 through the first fluid inflow channel 30444, due to the increase in space, the fluid pressure can be released to a certain extent, or temporarily buffered before entering the subsequent flow channel, so it is called a buffer cavity. Since the buffer cavity 30446 is set in the fluid inflow channel leading to the pressure chamber, the pressure builds more smoothly during the process of the fluid flowing into the pressure chamber and the pressure is established, and there will be no large fluctuations, thereby improving the controllability and stability of the damping.

[0079] like Figure 3 and Figure 6 As shown, the limiting valve disc 3043 and the valve disc unit 3042 are sleeved on the rod-shaped mounting portion 30442 and fixed by the fixing component 3041. The limiting valve disc 3043 is arranged on the mounting surface 30441, the valve disc unit 3042 is arranged on the limiting valve disc 3043, and the fixing component 3041 is pressed against the limiting valve disc 3043. The limiting valve disc 3043 serves as the mounting support and stress release point of the valve disc unit 3042, and provides deformation protection for the valve disc unit 3042. The valve disc unit 3042 provides a sealing effect under the action of the closing force. Figure 3 In the illustrated embodiment, the fixing member 3041 is a spring card, which is clamped on the rod-shaped mounting portion 30442 and pressed against the valve plate unit 3042, thereby fixing the valve plate unit 3042 and the limiting valve plate 3043 on the rod-shaped mounting portion 30442. In other embodiments, the fixing member 3041 can also adopt other fixing methods, such as screws, latches, etc. The screws and latches are matched 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.

[0080] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the balancing valve 305 includes a valve lower seat 3051 , a mounting valve plate 3054 , a sealing element 3055 , and a sealing elastic valve plate 3056 .

[0081] The upper part of the valve lower seat 3051 body forms an installation space 30511 of the buffer cavity forming part adapted to the buffer cavity forming part 30445, and the lower part of the valve lower seat 3051 body is provided with at least two regular through holes to form a fluid channel, including a second fluid inflow channel 3052 and a fluid outflow channel 3053. The second fluid inflow channel 3052 vertically (in other embodiments not shown in the drawings, it can also be oblique) penetrates the valve lower seat 3051 body, the inlet at the upper end of the second fluid inflow channel 3052 is fluidically connected to the buffer cavity 30446, and the outlet at the lower end of the second fluid inflow channel 3052 is fluidically connected to the pressure chamber 307. The diameter or flow cross-sectional area of ​​the second fluid inflow channel 3052 is smaller than the diameter or flow cross-sectional area of ​​the first fluid inflow channel 30444, so as to realize the control of pressure / flow rate. Therefore, the second fluid inflow channel 3052 is used as a pressure / flow control hole, and the pressure / flow rate of the fluid flow channel is adjusted by changing 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 flow cross-sectional area of ​​the first fluid inflow channel 30444 is twice or more than twice the flow cross-sectional area of ​​the second fluid inflow channel 3052. Figure 2 , Figure 4 and Fig. 9 As shown, the inlet at the lower end of the fluid outflow channel 3053 is fluidically connected to the pressure chamber 307 , and the outlet at the upper end of the fluid outflow channel 3053 is fluidically connected to the leakage gap 308 .

[0082] like Figure 2 As shown, the sealing element 3055 is used to achieve the sealing between the balancing valve 305 and the inner wall of the housing, so that the balancing valve 305 divides the interior of the housing into two relatively independent spaces, one above the other. Figure 4 In the embodiment shown, a circle of groove 30512 is formed on the outer side wall of the valve lower seat 3051, and the mounting valve disc 3054 and the sealing element 3055 are clamped in the groove 30512. 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 supporting part for the sealing element 3055 to ensure that the sealing element 3055 works and deforms according to the set trajectory. The outer periphery of the sealing element 3055 is sealed with the inner wall of the housing and can slide relative to each other. Figure 4 and Figure 5 In the illustrated embodiment, a convex hump 30513 is provided downwardly at the edge of the sealing element 3055. The convex hump 30513 can reduce deformation during the sliding process of the sealing element 3055, thereby improving sealing performance and durability.

[0083] like Figure 2 , Figure 6 and Figure 7As shown, the buffer cavity forming part 30443 is placed in the buffer cavity forming part installation space 30511 on the body of the valve lower seat 3051. Among them, the lower open edge 30445 of the buffer cavity forming part 30443 is placed on the body of the valve lower seat 3051, and the upper end entrance of the second fluid inflow channel 3052 is located inside the lower open edge of the buffer cavity forming part 30443 so as to be fluid-connected with the buffer cavity 30446. A sealing elastic valve sheet 3056 is arranged between the valve upper seat 3044 (buffer cavity forming part 30443) and the valve lower seat 3051, so that the fluid in the buffer cavity 30446 will not leak from the assembly gap between the valve upper seat 3044 (buffer cavity forming part 30443) and the valve lower seat 3051. Specifically, the sealing elastic valve sheet 3056 can be arranged along the lower open edge 30445 of the buffer cavity forming part 30443. At this time, the fluid flowing into the buffer chamber from the first fluid inflow channel 30444 can only flow to the pressure chamber 307 via the second fluid inflow channel 3052. Figure 4 As shown, two inner and outer supporting points are set on the valve lower seat 3051, and the sealing elastic valve plate 3056 is placed on the two supporting points. The inner supporting point is higher than the outer supporting point. The height matching of the supporting points and the elastic matching with the sealing elastic valve plate 3056 can improve the sealing performance.

[0084] In the embodiment shown in the drawings of the present invention, the upper valve seat 3044 and the lower valve seat 3051 are split structures. Those skilled in the art can understand that in other embodiments not shown in the drawings, the upper valve seat 3044 and the lower valve seat 3051 can be an integrated structure, and in the integrated structure, the buffer cavity forming portion 30443 and the lower valve seat 3051 also achieve sealing cooperation.

[0085] like Figure 2 , Figure 6 , Figure 7 and Fig. 9 As shown, a leakage gap 308 is provided between the outer wall of the buffer cavity forming part 30443 and the inner wall of the valve lower seat 3051 (the installation space 30511 of the buffer cavity forming part 30443), and the leakage gap 308 extends along the gap between the valve lower seat 3051 and the valve upper seat 3044 to the pressure relief cavity 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 outer shape of the buffer cavity forming part 30443, or by the outer size of the buffer cavity forming part 30443 being smaller than the size of the installation space of the buffer cavity forming part 30445.

[0086] The fluid outflow channel 3053 can be arranged in a variety of ways. Figure 4 , Figure 6 , Fig. 9 and Fig.11In the embodiment shown, the outlet position of the upper end of the fluid outflow channel 3053 is not covered by the sealing elastic valve plate 3056, and is located outside the edge of the sealing elastic valve plate 3056. In this case, the outlet of the upper end of the fluid outflow channel 3053 does not need to be provided with a leakage valve plate 3057, and the fluid can directly flow into the leakage gap 308 through the fluid outflow channel 3053.

[0087] exist Figure 2 , Figure 7 and Fig.10 In the embodiment shown, the upper end outlet of the fluid outflow channel 3053 is covered by a sealing elastic valve sheet 3056, which is located inside the edge of the sealing elastic valve sheet 3056. In order to prevent the sealing elastic valve sheet 3056 from preventing the fluid from flowing into the leakage gap 308 through the fluid outflow channel 3053, as shown in FIG. Figure 7 As shown, a discharge valve plate 3057 may be provided at the upper outlet of the fluid outflow channel 3053, and the discharge valve plate 3057 is located between the upper outlet of the fluid outflow channel 3053 and the sealing elastic valve plate 3056. Through the cooperation of the sealing elastic valve plate 3056 and the discharge valve plate 3057, when the shock absorber is in a high-frequency tensile state, the fluid in the pressure chamber may flow into the discharge gap 308 through the discharge valve plate 3057, while the fluid in the discharge gap 308 cannot flow back to the buffer chamber 30466 and the pressure chamber through the sealing elastic valve plate 3056 and the discharge valve plate 3057. The discharge valve plate 3057 may be a valve plate with a flow gap or gap, and at this time, the discharge valve plate 3057 partially covers the outlet of the fluid outflow channel 3053, and the sealing elastic valve plate 3056 covers the discharge valve plate 3057. The fluid in the pressure chamber flows from the fluid outflow channel 3053 into the leakage gap 308 through the notch or gap of the leakage valve plate 3057. The leakage valve plate 3057 can be a throttle valve. Since the leakage valve plate 3057 can conveniently adjust the area and flow rate of the leakage flow by selecting and changing its thickness, width, number of notches or gaps, and has a wide range of selections, the leakage valve plate 3057 can be set to conveniently, accurately, stably and low-control the flow, pressure and damping. Figure 7 In the illustrated embodiment, the sealing elastic valve disc 3056 is used to seal the valve lower seat and the valve upper seat, that is, to ensure that the fluid in the buffer chamber 307 does not leak. The leakage valve disc 3057 ensures that the fluid in the pressure chamber 307 flows into the leakage gap 308 through the opening or gap on the leakage valve disc 3057.

[0088] In order to facilitate the installation of the sealing elastic valve disc 3056 and the discharge valve disc 3057, the valve lower seat 3051 is provided with a limiting boss or a groove around the upper inlet of the second fluid inflow channel 3052. The sealing elastic valve disc 3056 or the discharge valve disc 3057 is sleeved on the limiting boss or placed in the limiting groove to prevent the sealing elastic valve disc 3056 or the discharge valve disc 3057 from being displaced relative to the valve lower seat 3051.

[0089] like Figure 2 and Figure 8 As shown, the movable valve 303 includes a supporting valve plate unit 3032, a supporting seal 3033 and a spring plate 3031. The supporting valve plate unit 3032 is arranged at the bottom of the housing. The supporting seal 3033 is placed on the supporting valve plate unit 3032, the outer peripheral edge of the supporting seal 3033 is sealed with the inner wall of the housing, and the spring plate 3031 and the supporting seal 3033 can slide relative to each other up and down along the inner wall of the housing. The spring plate 3031 is arranged on the supporting seal 3033. The supporting seal 3033 has a certain thickness, and a certain space is formed between the spring plate 3031 and the supporting valve plate unit 3032.

[0090] The spring sheet 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 step surface that matches the mounting hole, and the valve lower seat 3051 is placed on the mounting hole through the step surface, so that the spring sheet 3031 provides mounting support for the valve lower seat 3051 (balance valve 305). The valve lower seat 3051 has a certain height in the height direction. When the balance valve 305 is mounted on the spring sheet 3031 through the valve lower seat 3051, there is a certain space between the sealing element 3055 and the spring sheet 3031, that is, the sealing element 3055 does not contact the spring sheet 3031 and is designed to be suspended. This will not affect the pressure establishment, and will not affect the closing force between the outlet of the valve group fluid inlet channel 306 and the valve sheet unit 3042 during operation, and can avoid the generation of nonlinear loads.

[0091] The spring sheet 3031 is also provided with one or more connecting holes 30311 connecting the upper and lower sides, through which the spaces on the upper and lower sides of the spring sheet 3031 are connected to form a relatively independent space as the pressure chamber 307. The upper edge of the pressure chamber is sealed by the sealing element 3055, and the lower edge of the pressure chamber 307 is sealed by the supporting seal 3033. After the valve lower seat 3051 is installed on the spring sheet 3031, the lower end outlet of the second fluid inflow channel 3052 is connected to the pressure chamber, and the lower end inlet of the fluid outflow channel 3053 is connected to the pressure chamber 307. The supporting seal (O-ring) 3033 has a certain thickness, and the spring sheet 3031 and the supporting seal 3033 cooperate, and a certain space is provided at the bottom of the spring sheet 3031 to accommodate the deformation of the spring sheet 3031, and at the same time, the valve lower seat 3051 (balance valve 305) is in a suspended state. 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.

[0092] The position of the lower inlet of the fluid outflow channel 3053 can be arranged in a variety of ways. Figure 4 , Figure 6 , Fig. 9 and Fig.11 In the illustrated embodiment, the lower inlet of the fluid outflow channel 3053 is located on the side of the valve lower seat 3051 body, so that the lower inlet of the fluid outflow channel 3053 is located in the space above the spring sheet 3031 in the pressure chamber. Figure 2 , Figure 7 and Fig.10 In the illustrated embodiment, the lower inlet of the fluid outflow channel 3053 is located at the bottom surface of the valve lower seat 3051 body, and the lower outlet of the second fluid inflow channel 3052 both point to the space below the spring sheet 3031 in the pressure chamber.

[0093] like Figure 2 , Fig.10 and Fig.11 As shown, the bottom of the housing is concave to form a certain space as a storage space for supporting the deformation of the valve plate unit 3032, which is called the balance chamber 3010 in the present invention. A discharge port 3021 is also provided at the bottom of the housing so that the concave space is connected to the outside of the valve group housing. The discharge port 3021 is used to discharge air or oil in the concave space under certain circumstances.

[0094] like Figure 2 As shown, a limiting support portion 3011 for mounting the valve plate 3054 is provided on the side wall of the valve assembly housing, and the upper edge of the mounting valve plate 3054 in the balancing valve 305 abuts against the limiting support portion 3011. Figure 2 In the embodiment shown, the position limiting support portion 3011 is formed by the end of the upper shell 301. Figure 2As shown, the end of the upper shell 301 is a planar structure, that is, the end surface where the limiting support part 3011 cooperates with the installation valve plate 3054 is a plane, not a gradually changing curved surface. The inner and outer sides of the end surface of the upper shell are set as R-angle structures. That is, the place where the end surface of the upper shell transitions with the inner wall and the outer wall of the upper shell (at the corner of the end surface of the upper shell) is set as an R-angle structure. That is, the inner and outer sides (corners) of the limiting support part 3011 are set as R-angle structures. The R-angle structure on the outer side of the end surface of the upper shell is close to the inner wall of the lower shell, and is used as a guide structure when the upper shell and the lower shell are assembled. The R-angle structure on the inner side of the end surface of the upper shell faces the internal space of the shell, that is, the corner where the end surface of the upper shell transitions with the inner wall of the upper shell is an R-angle structure, which provides a smooth support point for the installation valve plate 3054 during movement. During assembly, the end surface serves as the installation limit portion 3011 for installing the valve disc 3054. When the valve disc 3054 and the sealing element 3055 are displaced along the inner wall of the shell, the R angle structure facing the inner space of the shell serves as a smooth support point for the installation of the valve disc 3054 and the sealing element 3055 to move up and down. After the FAD valve group assembly is assembled, the control valve and the top of the shell have a certain closing force, and the control valve, the balancing valve and the movable valve have certain deformation preload requirements. At this time, the deformation support point of the balancing valve is the inner R angle feature. During operation, under low-frequency conditions, the FAD valve group does not work, and the balancing valve tends to deform upward. The inner R angle provides a smooth support point for the installation valve disc and the sealing element of the balancing valve.

[0095] like Figure 2 As shown, the inner wall at the top of the valve group housing is provided with a matching portion 3012 that matches with the upper side of the valve plate unit 3042. After the upper side of the valve plate unit 3042 is abutted against and matched with the matching portion 3012, a certain value of closing force and sealing is achieved between the control valve 304 (valve plate unit 3042) and the matching portion 3012. Specifically, the matching portion 3012 that matches 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 inside of the shell until a closing force matching relationship is formed with the control valve 304 (valve plate unit 3042). Preferably, the matching portion is located at a position close to the outer periphery of the valve plate unit 3042.

[0096] like Figure 2 As shown, the cross-sectional area of ​​the valve group fluid inlet channel 306 can change step by step. For example, the inner cavity of the valve group fluid inlet channel 306 changes in steps, that is, the larger the cross-sectional area of ​​the part closer to the control valve 304, the larger the space is, forming a spatial variation structure, which serves as a buffer for the fluid inflow pressure.

[0097] 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.

[0098] During assembly, the movable valve 303 is installed first. The supporting valve plate unit 3032 is first placed at the bottom of the lower housing 302. During the installation process, the air or oil at the bottom of the housing can be discharged through the discharge port 3021 to avoid affecting the installation of the supporting valve plate unit 3032. Since the bottom housing of the lower housing 302 is concave, a space is formed between the bottom of the lower housing 302 and the supporting valve plate unit 3032. When the supporting valve plate unit 3032 is deformed downward under the action of fluid pressure, a space is provided for the deformation of the supporting valve plate unit 3032. The deformation time of the supporting valve plate unit 3032 provides pressure balance, which is called the balance chamber 3010 in the present invention. The supporting seal (O-ring) 3033 is arranged on the supporting valve plate unit 3032, and the spring plate 3031 is arranged on the supporting seal (O-ring) 3033. The supporting seal is used to seal the supporting valve plate unit 3032 and the inner wall of the lower housing 302. At this point, the movable valve 303 is installed.

[0099] Next, install the balancing valve 305. Place the valve lower seat 3051 on the spring sheet 3031, and the bottom step surface of the valve lower seat 3051 body cooperates with the installation hole of the spring sheet 3031, so that the spring sheet 3031 provides installation support for the valve lower seat 3051 (balancing valve 305). The sealing element 3055 is sealed and slidably matched with the inner wall of the lower shell 302. Since the spring sheet 3031 is provided with a connecting hole connecting the two sides, a relatively independent space is formed between the balancing valve 305 and the supporting valve sheet unit 3032. The upper part of the space is sealed by the sealing element 3055 and the inner wall of the shell, and the lower part is sealed by the supporting seal 3033 and the inner wall of the shell. The present invention refers to it as a pressure chamber 307.

[0100] Next, the control valve 304 is installed, and the buffer cavity forming part 30443 is placed in the installation space of the buffer cavity forming part 30443 on the body of the valve lower seat 3051. The lower open edge of the buffer cavity forming part 30443 is provided with a sealing elastic valve sheet 3056, so that the lower open edge of the buffer cavity forming part 30443 is sealed and matched with the body of the valve lower seat 3051, thereby forming a sealed buffer cavity 30446. The upper end entrance of the second fluid inflow channel 3052 is in communication with the buffer cavity 30446. After the buffer cavity forming part 30443 is placed in the installation space of the buffer cavity forming part on the body of the valve lower seat 3051, a leakage gap 308 is provided 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 area 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, and the fluid in the buffer chamber 30446 is prevented from leaking to other spaces or cavities through the assembly gap between the valve upper seat 3044 and the valve lower seat 3051, affecting the pressure establishment and pressure maintenance.

[0101] After the valve upper seat 3044 is installed on the valve lower seat 3051, the upper housing 301 is installed into the lower housing 302. After the upper housing 301 is installed 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 plate 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 plate unit 3042.

[0102] After the valve upper seat 3044 is installed in place, a relatively independent space is formed between the balancing valve 305 (installing the valve plate 3054), the control valve 304 and the inner wall of the valve group housing (the upper housing 301), which serves as a pressure relief chamber 309. The pressure relief chamber 309 is connected to the outside of the valve group housing through the leakage hole 3013 provided on the upper housing 301.

[0103] After the upper valve seat 3044 is installed on the lower valve seat 3051, the upper housing 301 is fixedly connected to the lower housing 302. Under the preload force cooperation of the supporting valve plate unit 3032, the supporting seal 3033, and the spring plate 3031, the upper side of the valve plate unit 3042 abuts against the inner wall of the top of the upper housing 301, and a certain closing force and sealing performance are formed between the control valve 304 and the outlet edge of the valve group fluid inlet channel 306. The size of the closing force can be adjusted according to the material properties of the supporting valve plate unit 3032, the supporting seal 3033, and the spring plate 3031, as well as the assembly relationship, preload, etc. 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, 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.

[0104] After assembly, a space structure including a valve group fluid inlet channel 306, a buffer chamber 30446, a pressure chamber 307, a pressure relief chamber 309 and a balance chamber 3010 is formed inside the FAD valve group 300. Among them, the valve group 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 fluidly connected to form a fluid passage. Specifically, the fluid in the valve group fluid inlet channel 306 can enter the buffer chamber 30446 via the first fluid inflow channel 30444 in the control valve 304, and the fluid in the buffer chamber 30446 can enter the pressure chamber 307 via the second fluid inflow channel 3052 in the balance valve 305. The fluid in the pressure chamber 307 can enter the leakage gap 308 between the control valve 304 and the balance valve 305 via the fluid outflow channel 3053 in the balance 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 housing through the leakage hole 3013. In the flow path that enters from the valve group fluid inlet channel 306 and flows out of the valve group housing 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 circulating 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 prior art, it will not affect the pressure establishment or the establishment of closing force.

[0105] During the process of fluid flowing into the pressure chamber 307, the pressure inside the pressure chamber 307 and the valve group is gradually built up. The pressure inside the pressure chamber 307 acts upward on the balance valve 305 and is transmitted to the control valve 304 through the balance valve 305. At this time, the closing force between the outlet of the valve group fluid inlet channel 306 and the valve plate unit 3042 is the sum of the preload force provided by the support valve plate unit 3032, the spring plate 3031, the valve plate unit 3042, etc. and the pressure inside the pressure chamber. That is, the closing force at this time comes from two parts. One part of the closing force is the preload force determined by the valve group structure, which is provided by the assembly relationship of the support valve plate unit 3032, the spring plate 3031, the valve plate unit 3042, the upper shell, and the lower shell, and the elastic properties of the material. The other part is the internal pressure formed after the fluid flows into the pressure chamber and builds up pressure. The pressure chamber builds up a certain value of pressure, which will push the balance valve 305 and the control valve 304 upward, thereby strengthening the closing force of the control valve 304. In short, at the initial stage of pressure establishment, the closing force is provided by the preload force, and after 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 (therefore it can 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, instead of opening the control valve 304 and flowing out from the flow path Fd4.

[0106] 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.

[0107] The reason why the present invention refers to valve 304 as a control valve is that one of the functions of the control valve 304 is to control the opening and closing of the gap between the valve plate unit 3042 and the outlet edge of the valve group fluid inlet channel 306. Of course, the control valve 304 also has other functions such as providing a fluid channel and a buffer chamber, and the other functions are not limited or ambiguous because the valve is called a control valve 304. The reason why the present invention refers to valve 305 as a balance valve 305 is that one of the functions of the balance valve 305 is to isolate the discharge chamber and the pressure chamber, so that the pressure of the pressure chamber can be established more accurately and quickly. Of course, the balance valve 305 also has other functions such as providing a fluid channel, and the other functions are not limited or ambiguous because the valve is called a balance valve 305. The reason why the present invention refers to valve 303 as an active valve 303 is that one of the functions of the active valve 303 is to provide a deformation space for the pressure chamber. Of course, the active valve 303 also has other functions such as providing support, and the other functions are not limited or ambiguous because the valve is called an active valve 303.

[0108] In the present invention, the control valve 304, the balancing valve 305 and the movable valve 303 can all move up and down inside the component housing, and are movable components. In the movable valve 303, the support valve plate unit 3032 is sealed with the inner wall of the component housing through the support seal 3033, but the support seal 3033 and the spring plate 3031 can be relatively displaced with the inner wall of the component housing. For example, when the fluid pressure in the pressure chamber reaches a certain level, or the control valve 304 moves downward, the middle part of the support valve plate unit 3032 and / or the spring plate 3031 drops and the edge rises, or the support seal 3033 and the spring plate 3031 move relatively downward along the inner wall of the component housing as a whole. The sealing element 3055 in the balancing valve 305 is sealed with the inner wall of the housing, and when the control valve 304 moves downward, it will push the balancing valve 305 to move downward, at which time the sealing element 3055 and the mounting valve plate 3054 will move downward along the inner wall of the component housing, and the valve lower seat 3051 will also move downward at the same time.

[0109] 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 inlet channel 3052 and finally enters the pressure chamber is a process in which pressure and damping are gradually established.

[0110] During the assembly process of the FAD valve group 300, the upper shell 301 and the lower shell 302 are assembled by controlling the preload force. The preload force setting is used to eliminate the accumulation of component tolerances and improve the stability of the damping force.

[0111] The valve upper seat 3044 adopts a regular through hole as the first fluid inflow channel 30444, and 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.

[0112] 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 forming solutions.

[0113] The present invention avoids the problem of durable attenuation of the supporting spring sheet in the prior art, and 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 of load, thereby ensuring durability and support while meeting the sealing requirements, thereby improving the durability of the valve group and the stability of damping.

[0114] 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, and different closing force designs are provided to achieve different damping requirements.

[0115] In terms of sealing design, the control valve 304 cooperates with the upper housing 301 through the upper end of the valve plate unit 3042 of the control valve 304 to achieve sealing under the closing force, and the control valve 304 is in a closed state. When the fluid in the shock absorber flows into the valve group fluid inlet channel 306 through the FAD inlet channel 400 in the valve stem, the valve plate unit 3042 and the interior of the upper housing 301 are sealed under the closing force, and the fluid builds up pressure in the valve group fluid inlet channel 306 after flowing into the valve group fluid inlet channel 306.

[0116] Although the control valve 304 is sealed with the interior of the upper housing 301 through the valve plate unit 3042 under the closing force, a flow gap can be opened between the control valve 304 and the upper housing 301, and the control valve 304 is in an open state at this time. Specifically, when the internal pressure of the valve group fluid inlet channel 306 reaches a certain level, the fluid in the valve group fluid inlet channel 306 will push the control valve 304 to move downward, and the closing force between the valve plate unit 3042 and the outlet edge of the valve group fluid inlet channel 306 will decrease or even disappear, and the gap Fd4 between the valve plate unit 3042 and the outlet edge of the valve group fluid inlet channel 306 will open, and the fluid will enter the pressure relief chamber through the gap. Whether the control valve 304 is opened and the size of the open flow channel depends on the size of the closing force between the control valve 304 and the upper housing 301.

[0117] The fixing component 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 component 3041 can be designed by pressure riveting and anti-loosening, such as using a spring card.

[0118] The valve sheet unit 3042 can be stacked by valve sheets 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 by comprehensively considering the functional materials.

[0119] The limit valve plate 3043 provides assembly limit for the valve plate unit 3042. The thickness and outer diameter of the limit valve plate 3043 are designed to match the outer diameter and thickness of the valve plate unit 3042, and the material thereof is an elastic material.

[0120] 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 to affect the stability of the damping force.

[0121] The support seal 3033 may be an O-ring, the upper end of the O-ring supports the spring sheet 3031, the lower end is placed on the support valve sheet unit 3032, the outer side leans against the lower shell 302 and is sealed on the inner wall of the lower shell 302. The O-ring 3033 is made of elastic material and has elastic deformation itself, providing the balance valve 305 with movable displacement up and down, and improving the linear change of the support force of the balance valve 305 through the material, hardness and O-type structure design, and transmitting to and increasing the closing force of the control valve. The O-ring 3033 is made of elastic material, and in the process of increasing and decreasing the pressure in the pressure chamber, it provides the increase and decrease of space brought by elastic deformation; the O-ring 3033 also cooperates with the lower shell 302 to provide sealing between the pressure chamber and the balance chamber.

[0122] 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 satisfying the pressure establishment of the pressure chamber.

[0123] 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. The closing force of the control valve 304 is increased by changing the material, thickness and quantity of the supporting valve plate unit 3032, further bringing about an increase or decrease in the damping force.

[0124] The middle position of the valve upper seat 3044 is provided with a fluid inlet channel 3052, and at least one oil outlet slit is provided at the outer position of the valve upper seat 3044, and a fluid pressure buffer chamber is provided at the bottom of the valve upper seat 3044. The valve upper seat 3044 is provided with a fluid inlet flow channel of a cylindrical hole (other shapes are also feasible), and the size and precision control of the channel provide stable flow and pressure establishment of the fluid; the lower end of the valve upper seat 3044 is designed with an oil leakage channel to realize the oil inlet and out circulation design, and the area of ​​the leakage channel needs to 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 balance valve 305, and metal injection, powder metallurgy or composite material design is adopted in combination with structure and functionality.

[0125] The inner position of the valve lower seat 3051 has an oil inlet channel 3052 and an oil outlet channel 3053, and there is at least one oil inlet channel 3052 and one oil outlet channel 3053. The valve lower seat 3051 is designed with the oil inlet flow channel of a cylindrical hole, and the size and precision control of the channel provide stable flow and pressure establishment of the oil.

[0126] The internal structure of the valve lower seat 3051 provides closure for the sealing elastic valve plate 3056 and the discharge valve plate 3057 to ensure their sealing performance.

[0127] The discharge valve plate 3057 is configured as a throttle valve. The discharge 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, oil backflow can be prevented during the extension of the shock absorber.

[0128] An assembly structure is arranged at the outer side of the valve lower seat 3051 to provide an assembly support for the valve plate 3054 and the sealing element 3055 .

[0129] A leaning module is arranged inside the upper shell 301 to provide the mounting valve plate 3054 with a leaning against for assembly. The leaning module at the upper shell 301 is arranged in a plane with R angles arranged on both inner and outer sides to provide a smooth support point for the mounting valve plate 3054 and the sealing element 3055 to move up and down.

[0130] The sealing element 3055 is against the mounting valve plate 3054 on the top, against the valve lower seat 3051 on the inside, and against 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.

[0131] The supporting valve plate unit 3032 is disposed 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 .

[0132] A leaning module and a space changing module are arranged inside the lower housing 302. The leaning module provides the supporting valve plate unit 3032 with a leaning for assembly, and the space changing module provides a space for the supporting valve plate unit 3032 to deform due to the pressure change in the pressure chamber.

[0133] The lower housing 302 is provided with an exhaust / oil discharge hole to provide a space for gas and oil discharge when the pressure change in the pressure chamber causes the support valve plate unit 3032 to deform.

[0134] The supporting valve plate unit 3032 includes at least four supporting plates, and the supporting plates are made of elastic material.

[0135] The FAD valve group 300 of the present invention is used as a component of a shock absorber. Figure 1 An embodiment of a shock absorber using the FAD valve group 300 of the present invention is shown. The shock absorber includes a piston rod 100, a first support washer 200, a FAD valve group 300, a FAD inlet channel 400, a flow valve assembly 500, a piston assembly 600, a recovery valve assembly 700 and a second support washer 800. The FAD valve group and the piston assembly are connected, and the closing force strength of the FAD valve group is greater than the closing force strength of the piston assembly.

[0136] The outer wall of the piston rod 100 is sleeved with a piston assembly 600, the bottom end of the piston rod 100 is provided with a FAD valve assembly 300, and the recovery valve assembly 700 and the flow valve assembly 500 are respectively arranged inside the piston assembly 600. The FAD inlet channel 400 runs through the piston rod 100 and is fluidically connected to the FAD valve assembly 300. The first support washer 200 is sleeved on the outer wall of the piston rod 100, and the second support washer 800 is connected to the recovery valve assembly 700 and is located inside the piston assembly 600.

[0137] In this embodiment, the bottom end of the piston rod 100 is threadedly connected to the FAD valve group 300, and the FAD inlet channel 400 located inside the piston rod 100 is connected by transverse and longitudinal through holes. The transverse hole is used for oil flow control, and the size of the hole is matched according to the requirements of the damping system. The cross-sectional area of ​​the hole increases linearly from the outer wall of the piston rod 100 to the inside; the longitudinal hole is designed for oil circulation, and the cross-sectional area of ​​the longitudinal hole is larger than the maximum cross-sectional area of ​​the transverse hole. At the same time, the longitudinal hole is spread out in a conical structure at the end of the bottom end of the piston rod 100, providing a larger oil flow space, as well as pressure balance and stability. The outer wall of the bottom end of the piston rod 100 is threadedly fixed with the inner wall of the inlet of the FAD valve group 300. The threaded fixing ensures durability. The tooth design can provide standard and 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.

[0138] The restoring valve assembly 700 is used to provide restoring damping under low-frequency conditions. Different materials, outer diameters and thicknesses of valve sheets form different restoring valve assemblies 700 to achieve different damping requirements to match the requirements of different vehicle models. At the same time, the plane 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.

[0139] The upper and lower parts of the piston assembly 600 are respectively supported by the circulation valve assembly 500 and the restoring valve assembly 700, which are respectively used to provide compression damping and restoring damping under low-frequency conditions. The holes and step difference designs of different piston assemblies 600 realize different damping requirements. The structure adopts powder metallurgy and the periphery adopts PTFE material overmolding design to control the isolation sealing of the upper and lower chambers.

[0140] When the restoration valve assembly 700 is open, the opening height of the restoration valve assembly 700 is limited by one end of the second support gasket 800 to improve durability. In combination with functional requirements, the other end provides effective contact with the FAD valve assembly 300. The material is made of hard powder metallurgy or stamping material.

[0141] When the circulation valve assembly 500 is open, the first support washer 200 is used to limit the opening height of the circulation valve assembly 500 to improve durability. In combination with functional requirements, the material is made of hard powder metallurgy or stamping materials. The circulation valve assembly 500 is used to provide compression damping under low-frequency conditions. Different materials, outer diameters and thicknesses of valve sheets form different circulation valve assemblies 500 to achieve different damping requirements to match the requirements of different vehicle models. At the same time, the plane design and elastic material design at both ends of the circulation valve assembly 500 are used to ensure the sealing of the circulation end of the piston assembly 600.

[0142] By setting up the FAD valve group 300, the sealing element 3055 and the valve lower seat 3051 are supported by the supporting 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.

[0143] In combination with the aforementioned shock absorber, the working principle and working process of the FAD valve group 300 are described in detail below.

[0144] The oil flow routes in the shock absorber include Fd route, Fd1 route, Fd2 route, Fd3 route and Fd4 route. Among them, 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 a route in which, after the control valve 304 is opened, the fluid flows from the fluid in 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.

[0145] In this embodiment, the working states of the shock absorber and the FAD valve group 300 are as follows:

[0146] Case 1: Low frequency stretching and low internal transient pressure

[0147] When the shock absorber is in the process of stretching, the frequency is low and the internal transient pressure is low, the internal pressure of the shock absorber is greater than the closing force of the piston assembly 600 and the restoring valve assembly 700, and less than the dynamic closing force and static closing force of the FAD valve group 300, the shock absorber oil flows through the Fd route, and the oil flow of the Fd route generates damping force through the piston assembly 600. The energy required by the damping system is mainly provided by the piston assembly 600. At this time, the FAD valve group 300 does not play a role. Since the first fluid inflow channel 30444 and the second fluid inflow channel 3052 in the FAD valve group 300 are all designed with regular through holes, a trace amount of oil will enter the fluid passage. At this time, the specific flow route of the oil is: enter the FAD valve group 300 from the Fd1 route, enter the pressure chamber 307 through the Fd2 route, and finally flow out of the FAD valve group 300 through the Fd3 route. Since the oil entering the FAD valve group 300 at this time is very small, the damping generated by the small amount of oil entering the FAD valve group 300 is also very small, which can be ignored for the overall damping requirements of the shock absorber. In other words, it does not affect the overall damping force of the shock absorber. The size of the actual working damping force of the shock absorber as a whole can be selected and designed in combination with the requirements of the damping system, that is, low-frequency damping. This situation is only a state presented by the flow path normally open design after using the FAD valve group 300 of the present invention. Since the small amount of damping can be ignored, this state is not the working condition targeted by the present invention.

[0148] Case 2: Low-frequency stretching and infinite internal pressure

[0149] When the shock absorber is in a low-frequency state during the stretching process but the shock absorber working speed and internal pressure are infinite (in actual application, this situation will only occur in extreme cases, and will not occur under normal circumstances), the internal pressure of the shock absorber is greater than the closing force of the piston assembly 600, the restoring valve assembly 700, and the dynamic closing force and static closing force of the FAD valve group 300. A part of the oil in the shock absorber flows through the Fd route of the piston assembly 600, and the oil flow of the Fd route generates a damping force through the piston assembly 600; another part of the oil generates a damping force through the FAD valve group 300. At this time, the oil flow route of the FAD valve group 300 is: the oil enters from the Fd1 route, the control valve 304 is opened, the oil flows out from the Fd4 route, and at the same time, part of the oil passes through the Fd2 route and finally flows out through the Fd3 route. In the above case, the shock absorber working speed is very high, and this working condition will hardly occur in actual application. This situation is only a theoretical extreme case, not the working condition targeted by the present invention.

[0150] Case 3: Low frequency compression

[0151] When the shock absorber is in the compression process and the frequency is low, the FAD valve group 300 does not work. The FAD valve group 300 is designed with a normally open oil circulation hole, and some oil will flow, which will reduce a certain compression damping, but it is a trace damping, which can be ignored and does not affect the overall damping force of the shock absorber. At this time, the oil flow route of the FAD valve group 300 is: reversely enter the FAD valve group 300 from the Fd3 route, reversely enter the Fd2 route, and finally reversely flow out through the Fd1 route. This situation is only a state presented by the normally open flow design after using the FAD valve group 300 of the present invention. Since the trace damping can be ignored, this state is not the working condition targeted by the present invention.

[0152] Case 4: High-frequency stretching

[0153] When the frequency of the shock absorber's stretching process is high and the internal transient pressure is high, the internal pressure of the shock absorber is greater than the closing force of the piston assembly 600, the restoring valve assembly 700, and the dynamic closing force of the FAD valve assembly 300. At this time, the piston assembly 600 and the FAD valve assembly 300 jointly provide damping force, that is, high-frequency damping. Part of the oil in the shock absorber flows through the Fd route, and the oil flow of the Fd route generates damping force through the piston assembly 600 and the restoring valve assembly 700; another part of the oil in the shock absorber flows through the Fd1 route, and the oil flow of the Fd1 route provides damping force through the FAD valve assembly 300. 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 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 a closing force for the control valve 304. After the shock absorber enters the high-frequency stretching state, the pressure in the shock absorber cylinder or the pressure in the valve group fluid inlet channel 306 increases and builds up faster than the pressure in the pressure chamber. When the oil pressure in the valve group fluid inlet channel 306 is greater than the sum of the closing force of the preload force and the closing force provided by the pressure in the pressure chamber, the oil pressure in the valve group fluid inlet channel 306 will push the control valve 304 to move downward, and the gap between the outlet of the valve group fluid inlet channel 306 and the valve plate unit 3042 will open, and part of the oil in the valve group fluid inlet channel 306 will flow out from the Fd4 route. After the Fd4 route is opened, another part of the oil in the valve group fluid inlet channel 306 continues to enter the pressure chamber from the Fd2 route, and the pressure in the pressure chamber gradually increases. The pressure in the pressure chamber continues to provide closing force for the control valve 304, and the closing force on the control valve 304 gradually increases and further controls the opening height of the FAD valve group 300. In this process, the oil in the pressure chamber flows out through the Fd3 route. The high-frequency stretching state is the working condition targeted by the present invention.

[0154] 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 plate and the sealing element of the balancing valve facing downward; ultimately, a smooth support point feature for the up and down movement of the balancing valve during operation is formed, and at the same time, the lower ends of the mounting valve plate and 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 when moving up and down does not affect the closing force of the FAD valve.

[0155] The control valve 304 and the balance valve 305 move downward, so that the spring sheet 3031 deforms downward, providing displacement space for the control valve 304 and the balance valve 305 to move downward.

[0156] When the pressure in the pressure chamber increases to a certain value, the supporting valve plate unit 3032 is deformed downward, thereby adjusting the size of the pressure chamber and balancing the pressure.

[0157] The working pressure and frequency of the FAD valve group 300 can be selected and designed in combination with system requirements.

[0158] Case 5: High-frequency compression

[0159] When the shock absorber is in the compression process with a high frequency, the FAD valve group 300 does not work. Due to the oil circulation design of the FAD valve group 300, some oil will flow inside the FAD valve group 300, which will reduce a certain compression damping, but it is a trace damping, which can be ignored and does not affect the overall damping force of the shock absorber. At this time, the oil flow route of the FAD valve group 300 is: reversely enter the inside of the FAD valve group 300 from the Fd3 route, reversely enter the Fd2 route, and finally reversely flow out of the FAD valve group 300 through the Fd1 route.

[0160] As an implementation manner, 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 .

[0161] As an implementation manner, the upper shell 301 and the lower shell 302 may be connected by welding or by threading.

[0162] As an implementation manner, the upper shell 301 is made of powder metallurgy material, and may also be made of metal injection material.

[0163] 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.

[0164] The valve upper seat 3044 is made of any one of powder metallurgy, composite materials and metal injection materials.

[0165] The valve plate unit 3042 and the spring card 3041 are made of elastic material.

[0166] The material of the discharge valve plate 3057 and the sealing elastic valve plate 3056 is elastic material.

[0167] The valve lower seat 3051 is made of any one of powder metallurgy, composite materials and metal injection materials.

[0168] The supporting valve plate unit 3032 is made of an elastic material which has elasticity.

[0169] The spring sheet 3031 and the mounting valve sheet 3054 are made of elastic material and thus have elasticity.

[0170] The lower housing 302 is deep drawn to provide torque fastening for the FAD valve assembly 300 and to support the valve train assembly.

[0171] The present invention increases the sealing structure design, and the sealing element 3055 achieves an isolation effect, thereby avoiding pressure leakage during the pressure building process and affecting the damping force stability. 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 damping force stability 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 system stability. 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 supporting spring sheet in the prior art solution, the sealing element and the valve lower seat are grooved and installed and suspended with interference design, so as not to contact the movable valve below, thereby meeting the sealing requirements while ensuring durability and support, thereby improving the durability and stability of the product.

[0172] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of 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 according to the claims of the present invention still fall within the scope of the invention.

[0173] 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 considered to be obvious to those skilled in the art.

Claims

1. A FAD valve group, comprising a valve group housing and a valve group fluid inlet passage (306), It is characterized in that A control valve (304) and a balance valve (305) are arranged inside the shell; The control valve (304) comprises a valve upper seat (3044); the body of the valve upper seat (3044) extends upward to form a rod-shaped mounting portion (30442), and the body of the valve upper seat (3044) extends downward to form a buffer cavity forming portion (30443); A regular through hole is formed inside the rod-shaped mounting portion (30442) along the length direction as a first fluid inflow channel (30444); a buffer cavity (30446) is formed inside the buffer cavity forming portion (30443); The buffer chamber (30446) is in fluid communication with the first fluid inflow channel (30444); The balancing valve (305) comprises a valve lower seat (3051) and a sealing element (3055); The valve lower seat (3051) body is provided with a regular through hole as a second fluid inflow channel (3052); the valve lower seat (3051) forms a sealed and slidable fit with the inner wall of the housing through the sealing element (3055); The buffer chamber forming portion (30443) is sealed and matched with the valve lower seat (3051), and the inlet of the second fluid inflow channel (3052) is fluidically connected to the buffer chamber (30446).

2. The FAD valve assembly according to claim 1, It is characterized in that 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).

3. The FAD valve assembly according to claim 1, It is characterized in that The control valve (304) further comprises a valve plate unit (3042), wherein the valve plate unit (3042) is mounted on the rod-shaped mounting portion (30442); a gap between the outlet of the valve group fluid inlet channel (306) and the valve plate unit (3042) is sealed under the closing force applied to the control valve (304); When the fluid pressure in the valve group fluid inlet channel (306) is greater than the closing force, the control valve (304) moves downward, and the gap between the outlet of the valve group fluid inlet channel (306) and the valve plate unit (3042) opens to establish a leakage flow path (Fd4).

4. The FAD valve assembly according to claim 3, It is characterized in that The outlet of the valve group fluid inlet channel (306) extends toward the inside of the housing until it forms a matching relationship with the valve plate unit (3042) in the control valve (304).

5. The FAD valve assembly according to claim 3, It is characterized in that The control valve (304) further comprises a limit valve plate (3043), wherein the limit valve plate (3043) is mounted on a mounting surface (30441) of a valve upper seat (3044), and the valve plate unit (3042) is mounted on the limit valve plate (3043).

6. The FAD valve assembly according to claim 5, It is characterized in that The control valve (304) further includes a fixing component (3041); the valve plate unit (3042) and the limit valve plate (3043) are fixed on the rod-shaped mounting portion (30442) by the fixing component (3041).

7. The FAD valve assembly according to claim 6, It is characterized in that The fixing component (3041) is a spring card or a nut; the spring card is clamped on the rod-shaped mounting portion (30442) and pressed against the valve plate unit (3042).

8. The FAD valve assembly according to claim 1, It is characterized in that The outer shape of the buffer cavity forming portion (30443) can be cylindrical or eccentric cylindrical.

9. The FAD valve assembly according to claim 1, It is characterized in that The buffer cavity (30446) is conical or cylindrical.

10. The FAD valve assembly according to claim 9, It is characterized in that The bottom of the conical or columnar buffer cavity is an open structure.

11. The FAD valve assembly according to claim 1, It is characterized in that 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).

12. The FAD valve assembly according to claim 1, It is characterized in that A pressure chamber (307) is provided in the valve group housing space below the balancing valve (305), and the outlet of the second fluid inflow channel (3052) is fluidically connected to the pressure chamber (307).

13. The FAD valve assembly according to claim 1, It is characterized in that The balancing valve (305) further comprises a mounting valve plate (3054), the outer side wall of the valve lower seat (3051) forms a circle of groove (30512), and the mounting valve plate (3054) and the sealing element (3055) are clamped in the groove (30512); the lower end surface of the sealing element (3055) is suspended in the air.

14. The FAD valve assembly according to claim 13, It is characterized in that A limit support portion (3011) is provided on the side wall of the shell, the upper end surface of the mounting valve plate (3054) is abutted against the limit support portion (3011), and the sealing element (3055) is limited by the lower end surface of the mounting valve plate (3054); a convex bump (30513) extends downward from the edge of the lower end surface of the sealing element (3055).

15. The FAD valve assembly according to claim 14, It is characterized in that The end face of the position-limiting support portion (3011) is a plane, and the corner facing the inner space of the shell is arranged as an R-angle structure.

16. The FAD valve assembly according to claim 14, It is 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).

17. The FAD valve assembly according to claim 12, It is 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) leads to the outside of the valve group housing via a fluid flow channel.

18. The FAD valve assembly according to claim 12, It is 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).

19. The FAD valve assembly according to claim 18, It is 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) leads to the outside of the valve group housing via a fluid flow channel.

20. The FAD valve assembly according to claim 19, It is characterized in that A pressure relief chamber (309) is formed between the balancing valve (305), the control valve (304) and the inner wall of the housing. The pressure relief chamber (309) leads to the outside of the valve group housing through a leakage hole (3013) provided on the valve group housing. 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.

21. The FAD valve assembly according to claim 20, It is characterized in that The gap between the outlet of the fluid inlet channel (306) of the valve group and the valve plate unit (3042) is sealed under the closing force exerted on the control valve (304); when the fluid pressure in the fluid inlet channel (306) of the valve group is greater than the closing force, the control valve (304) moves downward, and the gap between the outlet of the fluid inlet channel (306) of the valve group and the valve plate unit (3042) opens and is fluidically connected to the pressure relief chamber (309), thereby establishing a leakage flow path (Fd4).

22. The FAD valve assembly according to claim 17, It is 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).

23. The FAD valve assembly according to claim 17, It is 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.

24. The FAD valve assembly according to claim 23, It is characterized in that The discharge valve plate (3057) is a throttle valve plate.

25. The FAD valve assembly according to claim 23, It is characterized in that 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.

26. The FAD valve assembly according to claim 23, It is characterized in that A limiting boss or a limiting groove is provided on the valve lower seat (3051) around the inlet position at the upper end of the second fluid inflow channel (3052); the sealing elastic valve plate (3056) and the discharge valve plate (3057) are sleeved on the limiting boss or placed in the limiting groove.

27. The FAD valve assembly according to claim 17, It is characterized in that The inlet of the fluid outflow channel (3053) is located on the side of the valve lower seat (3051) body, so that the inlet of the fluid outflow channel (3053) is located in the space above the spring sheet (3031) in the pressure chamber (307).

28. The FAD valve assembly according to claim 17, It is characterized in that The inlet of the fluid outflow channel (3053) is located at the bottom of the valve lower seat (3051) body, so that the inlet of the fluid outflow channel (3053) is located in the space below the spring sheet (3031) in the pressure chamber (307).

29. The FAD valve assembly according to claim 12, It is characterized in that The invention also comprises a movable valve (303), wherein the movable valve (303) is used to support the balancing valve (305) and provide a closing force to the control valve (304).

30. The FAD valve assembly according to claim 29, It is characterized in that The movable valve (303) includes a supporting valve plate unit (3032), a supporting seal (3033) and a spring plate (3031); the supporting valve plate unit (3032) is arranged at the bottom of the shell, 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 the supporting seal (3033), and the spring plate (3031) and the supporting seal (3033) can move along the inner wall of the shell; the spring plate (3031) is arranged on the supporting seal (3033), and the valve lower seat (3051) is arranged on the spring plate (3031).

31. The FAD valve assembly according to claim 30, It is characterized in that The spring sheet (3031) is provided with a connecting hole (30311) connecting the upper and lower sides. Through the connecting hole (30311), the spaces on the upper and lower sides of the spring sheet (3031) are connected, and the space between the valve lower seat (3051) and the supporting valve sheet unit (3032) serves as a pressure chamber (307).

32. The FAD valve assembly according to claim 30, It is characterized in that The spring sheet (3031) is provided with a valve lower seat mounting hole, and the bottom of the valve lower seat (3051) body is adapted to the mounting hole, so that the spring sheet (3031) provides mounting support for the valve lower seat (3051).

33. The FAD valve assembly according to claim 30, It is characterized in that The supporting seal (3033) is an O-ring.

34. The FAD valve assembly according to claim 30, It is characterized in that The supporting seal (3033) has an elastic deformation function.

35. The FAD valve assembly according to claim 34, It is characterized in that The supporting valve plate unit (3032) is arranged on the supporting part at the bottom of the shell, the bottom of the shell is concave or the installation position of the supporting valve plate unit (3032) is a certain distance away from the bottom of the shell, thereby forming a certain space below the supporting valve plate unit (3032) as a storage space when the supporting valve plate unit (3032) is deformed.

36. The FAD valve assembly according to claim 30, It is characterized in that Before the pressure chamber (307) builds up pressure, the closing force on the control valve (304) is provided by the assembly preload force of the spring sheet (3031); after the pressure chamber (307) builds up pressure, the closing force on the control valve (304) is provided by both the assembly preload force of the spring sheet (3031) and the pressure built up by the pressure chamber (307).

37. A FAD valve assembly, comprising a valve assembly housing and a valve assembly fluid inlet passage (306), It is characterized in that A control valve (304), a balance valve (305) and a pressure chamber (307) are arranged inside the valve group housing; A first fluid inflow channel (30444) and a buffer chamber (30446) that are always open are formed inside the control valve (304); A normally open second fluid inflow channel (3052) is formed inside the balancing valve (305); the second fluid inflow channel (3052) is fluidically connected to the pressure chamber (307); 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); The first fluid inflow channel (30444), the buffer chamber (30446), and the second fluid inflow channel (3052) are fluidically connected in sequence to form a fluid inflow path (Fd2) for the fluid to flow into the pressure chamber (307).

38. The FAD valve assembly according to claim 37, It is characterized in that The gap between the outlet of the valve group fluid inlet channel (306) and the control valve (304) is sealed under the action of the closing force exerted on the control valve (304); During the process of fluid flowing into the pressure chamber (307) along the fluid inflow path (Fd2), when the fluid pressure in the valve group fluid inlet channel (306) is greater than the closing force, the control valve (304) moves downward, and the gap between the outlet of the valve group fluid inlet channel (306) and the control valve (304) opens and establishes a leakage flow path (Fd4).

39. The FAD valve assembly according to claim 37, It is characterized in that The cross-sectional area of ​​the buffer cavity (30446) is larger than the cross-sectional area of ​​the first fluid inflow channel (30444).

40. The FAD valve assembly according to claim 39, It is characterized in that The buffer cavity (30446) is conical or cylindrical.

41. The FAD valve assembly according to claim 37, It is characterized in that A pressure relief chamber (309) is also provided inside the valve assembly housing, and the pressure relief chamber (309) is fluidically connected to the outside of the valve assembly housing.

42. The FAD valve assembly according to claim 41, It is characterized in that After the gap between the outlet of the valve group fluid inlet channel (306) and the control valve (304) is opened, the fluid is connected to the pressure relief chamber (309), and part of the fluid in the valve group fluid inlet channel (306) flows into the pressure relief chamber (309) through the gap after opening. The pressure relief chamber (309) and the passage connecting the pressure relief chamber (309) with the external fluid of the valve group housing are part of the leakage flow path (Fd4).

43. The FAD valve assembly according to claim 42, It is characterized in that The balancing valve (305) is also provided with a normally open fluid outflow channel (3053) as a part of the fluid outflow path (Fd3).

44. The FAD valve assembly according to claim 43, It is characterized in that The fluid outflow channel (3053) is in fluid communication with the pressure relief chamber (309), and the fluid in the pressure chamber (307) enters the pressure relief chamber (309) via the fluid outflow channel (3053). The pressure relief chamber (309) and the passage connecting the pressure relief chamber (309) with the external fluid of the valve group housing are part of the fluid outflow path (Fd3).

45. The FAD valve assembly according to claim 44, It is characterized in that A leakage gap (308) is formed between the balancing valve (305) and the control valve (304), and the leakage gap (308) fluidly connects the pressure relief chamber (309) and the fluid outflow channel (3053), and the leakage gap (308) is a part of the fluid outflow path (Fd3).

46. ​​The FAD valve assembly according to any one of claims 37 to 45, It is characterized in that The valve assembly also includes a spring sheet (3031) located inside the valve assembly housing; the balancing valve (305) is arranged on the spring sheet (3031), and the control valve (304) is arranged on the balancing valve (305); the spring sheet (3031) provides a supporting force for the balancing valve (305) and the control valve (304); and the assembly pre-tightening force of the spring sheet (3031) also provides an initial closing force for the control valve (304).

47. The FAD valve assembly according to claim 46, It is characterized in that The balancing valve (305) is sealed with the inner wall of the valve assembly housing and can slide relative to it, and the lower cavity of the balancing valve (305) forms a pressure chamber (307).

48. The FAD valve assembly according to claim 47, It is characterized in that A movable valve (303) is also arranged inside the shell; the movable valve (303) is composed of a supporting valve sheet unit (3032), a supporting seal (3033) and the spring sheet (3031); the supporting valve sheet unit (3032) is arranged at the bottom of the valve group shell, the supporting seal (3033) is placed on the supporting valve sheet unit (3032), the supporting valve sheet unit (3032) is sealed with the inner wall of the shell by the supporting seal (3033), and the spring sheet (3031) and the supporting seal (3033) can move along the inner wall of the shell; the spring sheet (3031) is arranged on the supporting seal (3033), and the valve lower seat (3051) is arranged on the spring sheet (3031); the assembly pre-tightening force of the spring sheet (3031) provides an initial closing force for the control valve (304).

49. The FAD valve assembly according to any one of claims 47 and 48, It is characterized in that Before a certain pressure is established in the pressure chamber (307), the closing force applied to the control valve (304) is provided by the assembly preload force of the spring sheet (3031); after a certain pressure is established in the pressure chamber (307), the closing force applied to the control valve (304) is provided by both the assembly preload force of the spring sheet (3031) and the pressure established in the pressure chamber (307).

50. A vibration absorber, It is characterized in that The FAD valve group comprises the one described in any one of claims 1 to 45, wherein the fluid inlet passage in the shock absorber piston rod is fluidically connected to the fluid inlet passage (306) of the valve group.

51. The vibration absorber of claim 50, It is characterized in that It also includes a spring sheet (3031) located inside the valve group housing; the balancing valve (305) is arranged on the spring sheet (3031), and the control valve (304) is arranged on the balancing valve (305); the spring sheet (3031) provides a supporting force for the balancing valve (30) 5 and the control valve (304); and the assembly pre-tightening force of the spring sheet (3031) also provides an initial closing force for the control valve (304).

52. The vibration absorber according to claim 51, It is characterized in that The balancing valve (305) is sealed with the inner wall of the valve assembly housing and can slide relative to it, and the lower cavity of the balancing valve (305) forms a pressure chamber (307).

53. The vibration absorber of claim 52, It is characterized in that A movable valve (303) is also arranged inside the shell; the movable valve (303) is composed of a supporting valve sheet unit (3032), a supporting seal (3033) and the spring sheet (3031); the supporting valve sheet unit (3032) is arranged at the bottom of the valve group shell, the supporting seal (3033) is placed on the supporting valve sheet unit (3032), the supporting valve sheet unit (3032) is sealed with the inner wall of the shell by the supporting seal (3033), and the spring sheet (3031) and the supporting seal (3033) can move along the inner wall of the shell; the spring sheet (3031) is arranged on the supporting seal (3033), and the valve lower seat (3051) is arranged on the spring sheet (3031); the assembly pre-tightening force of the spring sheet (3031) provides an initial closing force for the control valve (304).

Images