Rebuilt valve assembly, shock absorber and vehicle

Abstract

According to the rebuilt valve assembly, the shock absorber and the vehicle, the rebuilt valve assembly is used for being arranged on a piston rod in a sleeved mode, the rebuilt valve assembly comprises a first limiting piece, a first valve block set, a circulation valve body, a piston, a rebuilt valve body, a second valve block set, a second limiting piece and a locking piece which are sequentially arranged, and a first valve hole is formed in the circulation valve body; the circulation valve bodies have different specifications, and the piston is provided with a through hole; a second valve hole is formed in the recovery valve body, the recovery valve body has different specifications, and the locking piece is used for enabling the second limiting piece, the second valve plate set, the recovery valve body, the piston, the circulation valve body, the first valve plate set and the first limiting piece to be tightly attached and locked on the piston rod. In the development process of the shock absorber, if the flow of the current rebuilt valve assembly does not meet the matching and adjusting requirements of the shock absorber of the whole vehicle, only the specifications of the circulating valve body and the rebuilt valve body need to be replaced, and therefore the problem that the consistency of multiple pistons can not be guaranteed possibly is solved.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper technology, and in particular to a recovery valve assembly and a vibration damper. Background Technology

[0002] In traditional valve systems, the flow rate of the recovery valve assembly is a fixed value. If the current flow rate of the recovery valve assembly does not match the requirements of the vehicle's shock absorbers, a piston with a different flow rate (the piston is part of the recovery valve assembly) needs to be developed to adjust the flow rate of the recovery valve assembly's flow valve. During the matching and tuning process with the vehicle's shock absorbers, pistons with different flow rates need to be continuously developed until the matching and tuning requirements of the vehicle's shock absorbers are met. Thus, developing multiple pistons not only increases costs but also makes it impossible to guarantee the consistency of multiple pistons. Utility Model Content

[0003] Based on this, the main objective of this utility model is to provide a recovery valve assembly, shock absorber, and vehicle that can obtain different flow valve flow rates without developing multiple pistons with different flow rates, thereby avoiding piston consistency issues.

[0004] To achieve the above objectives, this utility model provides a recovery valve assembly for mounting on a piston rod, the recovery valve assembly comprising:

[0005] First limiting component;

[0006] The first valve plate group is disposed on one side of the first limiting member;

[0007] A flow valve body is disposed on the side of the first valve plate group away from the first limiting member. The flow valve body has a first valve hole. The flow valve body includes different specifications, and the diameter of the first valve hole of the flow valve body of different specifications is different.

[0008] A piston is disposed on the side of the flow valve body opposite to the first valve plate group, and the piston has a through hole;

[0009] A recovery valve body is disposed on the side of the piston away from the flow valve body, and a second valve hole is provided. The recovery valve body includes different specifications, and the diameter of the second valve hole of the recovery valve body of different specifications is different.

[0010] The second valve plate group is disposed on the side of the recovery valve body opposite to the piston;

[0011] The second limiting member is disposed on the side of the second valve plate group piston away from the restoration valve body;

[0012] A locking element is disposed on the side of the second limiting element away from the second valve plate assembly. The locking element is used to tightly attach and lock the second limiting element, the second valve plate assembly, the recovery valve body, the piston, the flow valve body, the first valve plate assembly, and the first limiting element onto the piston rod.

[0013] Preferably, the diameter of the first valve hole is 1-2.5 mm, and the diameter of the second valve hole is 1-2.5 mm.

[0014] Preferably, the first valve plate group includes a plurality of first valve plates arranged sequentially, and the outer diameter of each of the plurality of first valve plates is not less than the outer diameter of the adjacent first valve plate along the direction of the flow valve body pointing towards the first limiting member; the second valve plate group includes a plurality of second valve plates arranged sequentially, and the outer diameter of each of the plurality of second valve plates is not less than the outer diameter of the adjacent second valve plate.

[0015] Preferably, the first valve plate group further includes a first throttling valve plate and a first fulcrum valve plate, a plurality of the first valve plates are located between the first throttling valve plate and the first fulcrum valve plate, the first throttling valve plate is located between the flow valve body and the plurality of the first valve plates, the outer diameter of the first throttling valve plate is the same as the outer diameter of the first valve plate with the largest outer diameter among the plurality of the first valve plates, and the outer diameter of the first fulcrum valve plate is smaller than the outer diameter of the first valve plate with the smallest outer diameter among the plurality of the first valve plates;

[0016] The second valve plate group also includes a second throttling valve plate and a second fulcrum valve plate. A plurality of second valve plates are located between the second throttling valve plate and the second fulcrum valve plate. The second throttling valve plate is located between the flow valve body and the plurality of second valve plates. The outer diameter of the second throttling valve plate is the same as the outer diameter of the second valve plate with the largest outer diameter among the plurality of second valve plates. The outer diameter of the second fulcrum valve plate is smaller than the outer diameter of the second valve plate with the smallest outer diameter among the plurality of second valve plates.

[0017] Preferably, there are two or more first valve plates with the same outer diameter as the first throttling valve plate; and there are two or more second valve plates with the same outer diameter as the second throttling valve plate.

[0018] Preferably, the recovery valve assembly further includes a third valve plate group, which is disposed between the second valve plate group and the second limiting member. The third valve plate group includes a plurality of third valve plates arranged sequentially. In the direction from the recovery valve body to the second limiting member, the outer diameter of each of the plurality of third valve plates is not less than the outer diameter of the adjacent third valve plate.

[0019] Preferably, the outer diameter of the second valve plate with the largest outer diameter in the second valve plate group is 22 mm or more, and the outer diameter of the third valve plate with the largest outer diameter in the third valve plate group is 24 mm or more.

[0020] Preferably, the middle portion of the flow valve body on the side facing the piston is recessed in a direction away from the piston, and / or the middle portion of the recovery valve body on the side facing the piston is recessed in a direction away from the piston.

[0021] To achieve the above objectives, this utility model also provides a shock absorber, including the aforementioned recovery valve assembly.

[0022] To achieve the above objectives, this utility model also provides a vehicle including the aforementioned shock absorber.

[0023] Advantages of this utility model: The recovery valve assembly includes a first limiting member, a first valve plate group, a flow valve body, a piston, a recovery valve body, a second valve plate group, a second limiting member, and a locking member. Since this application sets up a flow valve body and a recovery valve body, and the flow valve body and the recovery valve body include different specifications, in the process of developing the shock absorber, if the flow rate of the current recovery valve assembly does not meet the matching and adjustment requirements of the vehicle shock absorber, it is only necessary to change the specifications of the flow valve body and the recovery valve body. The orifice diameters of the first valve hole and the second valve hole corresponding to the different specifications of the flow valve body and the recovery valve body are different, so the flow rates of the different specifications of the flow valve body and the recovery valve body are different, until the required flow rate is obtained. In this way, it is not necessary to replace the piston with different flow rates to meet the matching and adjustment requirements of the vehicle shock absorber, thereby avoiding the problem that the consistency of multiple pistons may not be guaranteed. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the devices shown in these drawings without creative effort.

[0025] Figure 1 This is an exploded view of a recovery valve assembly according to one embodiment;

[0026] Figure 2 An exploded side view of a recovery valve assembly according to one embodiment;

[0027] Among them, 100 is the first limiting member; 200 is the first valve plate group; 210 is the first valve plate; 220 is the first throttling valve plate; 230 is the first fulcrum valve plate; 300 is the flow valve body; 310 is the first valve hole; 400 is the piston; 410 is the through hole; 500 is the return valve body; 510 is the second valve hole; 600 is the second valve plate group; 610 is the second valve plate; 620 is the second throttling valve plate; 630 is the second fulcrum valve plate; 700 is the second limiting member; 800 is the locking member; 900 is the third valve plate group; 910 is the third valve plate; 920 is the third throttling valve plate; 930 is the third fulcrum valve plate.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, "and / or" throughout the text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] This application relates to the matching and adjustment of vehicle shock absorbers. The recovery valve assembly, piston rod (not shown in the figure, but reference can be made to piston rods in existing technology that achieve the functions of this application), working cylinder, hydraulic cylinder, and other structures work together to form a shock absorber to suppress vehicle vibration during operation. Specifically, depending on the vehicle's driving conditions and road surface conditions, the recovery valve assembly can finely adjust the damping force of the shock absorber to effectively suppress vehicle body vibration, reduce wear and fatigue damage to vehicle components, and extend the vehicle's service life. For example, when the vehicle is traveling at high speed or on rough roads, the recovery valve assembly can increase the damping force, stiffening the suspension system and improving vehicle stability and handling; when the vehicle is traveling at low speed or on flat roads, it can decrease the damping force, softening the suspension system and improving ride comfort.

[0032] like Figure 1 and Figure 2 As shown, a recovery valve assembly is used to be sleeved on a piston rod. The recovery valve assembly includes a first limiting member 100, a first valve plate group 200, a flow valve body 300, a piston 400, a recovery valve body 500, a second valve plate group 600, a second limiting member 700, and a locking member 800. The first valve plate group 200 is disposed on one side of the first limiting member 100, and the flow valve body 300 is disposed on the side of the first valve plate group 200 opposite to the first limiting member 100. The flow valve body 300 has a first valve hole 310. The flow valve body 300 includes different specifications, and the diameter of the first valve hole 310 of the flow valve body 300 of different specifications is different. The piston 400 is disposed on the side of the flow valve body 300 opposite to the first valve plate group 200, and the piston 400 has a through hole 410. A body 500 is disposed on the side of the piston 400 opposite to the flow valve body 300, and has a second valve hole 510. The recovery valve body 500 includes different specifications, and the diameter of the second valve hole 510 varies for different specifications. A second valve plate assembly 600 is disposed on the side of the recovery valve body 500 opposite to the piston 400. A second limiting member 700 is disposed on the side of the second valve plate assembly 600 and piston 400 opposite to the recovery valve body 500. A locking member 800 is disposed on the side of the second limiting member 700 opposite to the second valve plate assembly 600. The locking member 800 is used to tightly fit and lock the second limiting member 700, the second valve plate assembly 600, the recovery valve body 500, the piston 400, the flow valve body 300, the first valve plate assembly 200, and the first limiting member 100 onto the piston rod. In this embodiment, the locking member 800 is a nut, and the piston rod has threads adapted to fit the nut.

[0033] The recovery valve assembly includes a first limiting member 100, a first valve plate assembly 200, a flow valve body 300, a piston 400, a recovery valve body 500, a second valve plate assembly 600, a second limiting member 700, and a locking member 800. Because this application includes a flow valve body 300 and a recovery valve body 500, and these two valve bodies have different specifications, during the development of the shock absorber, if the flow rate of the current recovery valve assembly does not meet the matching and tuning requirements of the vehicle's shock absorber, only replacement is needed. The specifications of the flow valve body 300 and the restoration valve body 500 are sufficient. The diameters of the first valve hole 310 and the second valve hole 510 corresponding to different specifications of the flow valve body 300 and the restoration valve body 500 are different, so the flow rates of the flow valve body 300 and the restoration valve body 500 are different until the required flow rate is obtained. In this way, the matching and adjustment requirements of the whole vehicle shock absorber can be met without replacing the piston 400 with different flow rates, thus avoiding the problem that the consistency of multiple pistons 400 may not be guaranteed.

[0034] Specifically, the first valve plate group 200 and the flow valve body 300 constitute the flow valve, and the restoration valve body 500 and the second valve plate group 600 constitute the restoration valve. The piston 400 consists of two parts: a piston base and a piston rubber coating. The processing technology of the piston 400 is relatively complex and has too much fluctuation. Therefore, it is difficult to guarantee the consistency of the piston 400. On the other hand, the flow valve body 300 and the restoration valve body 500 only have a powder base, and the processing technology is simple, so the consistency is easy to guarantee.

[0035] In this embodiment, the various structures of the restoration valve assembly, such as the first limiting member 100, the flow valve body 300, and the piston 400, are all approximately annular in shape to facilitate fitting onto the piston rod.

[0036] In this embodiment, there are multiple first valve holes 310, which are evenly distributed in the flow valve body 300. Further, the multiple first valve holes 310 are evenly distributed in a circumferential arrangement in the flow valve body 300. In some embodiments, the number of first valve holes 310 is 6, 8, or 10. It is understood that in other embodiments, the number of first valve holes 310 can be any number that satisfies the damper matching and adjustment requirements. Similarly, there are multiple second valve holes 510, which are evenly distributed in the flow valve body 300. Further, the multiple second valve holes 510 are evenly distributed in a circumferential arrangement in the flow valve body 300. In some embodiments, the number of second valve holes 510 is 6, 8, or 10. It is understood that in other embodiments, the number of second valve holes 510 can be any number that satisfies the damper matching and adjustment requirements. The piston 400 has multiple through holes 410, which are evenly distributed on the piston 400. Furthermore, the multiple through holes 410 are evenly distributed on the piston 400 in a circumferential arrangement. In this embodiment, there are three through holes 410. It is understood that in other embodiments, the number of through holes 410 may be more or less.

[0037] refer to Figure 1 The diameter of the first valve orifice 310 is 1-2.5mm, and the diameter of the second valve orifice 510 is 1-2.5mm. Specifically, in practice, the flow rate through the valve body 300 needs to meet 16-35mm. 2 Replace the flow valve body 300 with a different orifice diameter in the first valve orifice 310 until the required flow rate of the flow valve body 300 is obtained. In practice, the flow rate of the valve body 500 needs to be restored to meet 12-35 mm. 2 Replace the second valve orifice 510 with a different diameter to obtain the required flow rate of the restoration valve body 500.

[0038] refer to Figure 1 The first valve plate group 200 includes a plurality of first valve plates 210 arranged sequentially. The outer diameter of each of the plurality of first valve plates 210 is not less than the outer diameter of another first valve plate 210 adjacent to and away from the flow valve body 300. Specifically, the first valve plate group 200 is conical in shape. For example, along the direction from the flow valve body 300 to the first limiting member 100, the outer diameter of the first valve plate 210 does not increase, but gradually decreases. Of course, the outer diameters of two adjacent first valve plates 210 can also be the same, as long as the whole is conical in shape.

[0039] refer to Figure 1The first valve plate group 200 also includes a first throttling valve plate 220 and a first fulcrum valve plate 230. Multiple first valve plates 210 are located between the first throttling valve plate 220 and the first fulcrum valve plate 230. The first throttling valve plate 220 is located between the flow valve body 300 and the multiple first valve plates 210. The outer diameter of the first throttling valve plate 220 is the same as the outer diameter of the first valve plate 210 with the largest outer diameter among the multiple first valve plates 210. The outer diameter of the first fulcrum valve plate 230 is smaller than the outer diameter of the first valve plate 210 with the smallest outer diameter among the multiple first valve plates 210. The first fulcrum valve plate 230 determines the stiffness of the first valve plate group 200. The larger the outer diameter of the first fulcrum valve plate 230, the smaller the stiffness and the more precise the adjustable damping force.

[0040] refer to Figure 1 The number of first valve plates 210 with the same outer diameter as the first throttling valve plate 220 is two or more. Specifically, when there is only one first valve plate 210 with the same outer diameter as the first throttling valve plate 220, the first valve plate 210 is easily damaged when the oil passes through the flow valve body 300 and impacts the first valve plate 210, causing the first valve plate 210 to deform. When there are two or more first valve plates 210 with the same outer diameter as the first throttling valve plate 220, the service life of the first valve plate 210 can be extended.

[0041] refer to Figure 1 The second valve plate group 600 includes a plurality of second valve plates 610 arranged sequentially. The outer diameter of each of the plurality of second valve plates 610 is not less than the outer diameter of the adjacent second valve plate 610 that is opposite to the restoration valve body 500. Specifically, the second valve plate group 600 is conical in shape. For example, along the direction from the restoration valve body 500 to the second limiting member 700, the outer diameter of the second valve plate 610 does not increase, but gradually decreases. Of course, the outer diameters of two adjacent second valve plates 610 can also be the same, as long as the whole is conical in shape.

[0042] refer to Figure 1 The second valve plate group 600 also includes a second throttling valve plate 620 and a second fulcrum valve plate 630. Multiple second valve plates 610 are located between the second throttling valve plate 620 and the second fulcrum valve plate 630. The second throttling valve plate 620 is located between the restoring valve body 500 and the multiple second valve plates 610. The outer diameter of the second throttling valve plate 620 is the same as the outer diameter of the second valve plate 610 with the largest outer diameter among the multiple second valve plates 610. The outer diameter of the second fulcrum valve plate 630 is smaller than the outer diameter of the second valve plate 610 with the smallest outer diameter among the multiple second valve plates 610. The second fulcrum valve plate 630 determines the stiffness of the second valve plate group 600. The larger the outer diameter of the second fulcrum valve plate 630, the smaller the stiffness and the more precise the adjustable damping force.

[0043] refer to Figure 1There are two or more second valve plates 610 with the same outer diameter as the second throttle valve plate 620. Specifically, if there is only one second valve plate 610 with the same outer diameter as the second throttle valve plate 620, the second valve plate 610 is easily damaged when the oil impacts the second valve plate 610 through the flow valve body 300, causing deformation. When there are two or more second valve plates 610 with the same outer diameter as the second throttle valve plate 620, the service life of the second valve plate 610 can be extended.

[0044] refer to Figure 1 The recovery valve assembly also includes a third valve plate group 900, which is disposed between the second valve plate group 600 and the second limiting member 700. The third valve plate group 900 includes a plurality of third valve plates 910 arranged sequentially. The outer diameter of each of the plurality of third valve plates 910 is not less than the outer diameter of the adjacent third valve plate 910 that is opposite to the recovery valve body 500. Specifically, the third valve plate group 900 is conical in shape. For example, along the direction from the recovery valve body 500 to the second limiting member 700, the outer diameter of the third valve plate 910 does not increase, but gradually decreases. Of course, the outer diameters of two adjacent third valve plates 910 can also be the same, as long as the whole is conical in shape.

[0045] Specifically, when the recovery valve assembly includes the third valve plate group 900, the locking member 800 is used to ensure that the second limiting member 700, the third valve plate group 900, the second valve plate group 600, the recovery valve body 500, the piston 400, the flow valve body 300, the first valve plate group 200, and the first limiting member 100 are tightly fitted and locked onto the piston rod. At this time, the recovery valve body 500, the second valve plate group 600, and the third valve plate group 900 constitute the recovery valve.

[0046] refer to Figure 1 The third valve group 900 also includes a third throttling valve 920 and a third fulcrum valve 930. Multiple third valves 910 are located between the third throttling valve 920 and the third fulcrum valve 930. The third throttling valve 920 is located between the second valve group 600 and the multiple third valves 910. The outer diameter of the third throttling valve 920 is the same as the outer diameter of the third valve 910 with the largest outer diameter among the multiple third valves 910. The outer diameter of the third fulcrum valve 930 is smaller than the outer diameter of the third valve 910 with the smallest outer diameter among the multiple third valves 910. Among them, the third fulcrum valve 930 determines the stiffness of the third valve group 900. The larger the outer diameter of the third fulcrum valve 930, the smaller the stiffness and the more precise the adjustable damping force.

[0047] refer to Figure 1There are two or more third valve plates 910 with the same outer diameter as the third throttle valve plate 920. Specifically, if there is only one third valve plate 910 with the same outer diameter as the third throttle valve plate 920, it is easy for the third valve plate 910 to be damaged when the oil impacts the third valve plate 910 through the flow valve body 300, causing the third valve plate 910 to deform. When there are two or more third valve plates 910 with the same outer diameter as the third throttle valve plate 920, the service life of the third valve plate 910 can be extended.

[0048] refer to Figure 1 In the second valve group 600, the outer diameter of the second valve 610, which has the largest outer diameter, is 22 mm or more, and in the third valve group 900, the outer diameter of the third valve 910, which has the largest outer diameter, is 24 mm or more. Specifically, in the prior art, the outer diameter of the largest valve in the valve group is less than 18 mm. The outer diameters of the second valve 610 and the third valve 910 in this application are larger. The larger the outer diameter, the smaller the stiffness and the smaller the damping force. Therefore, the adjustment gradient of the damping force of the second valve group 600 and the third valve group 900 in this application is more precise.

[0049] Specifically, if only the second valve group 600 of this application is considered, the damping force generated is smaller than that generated in the prior art. However, the damping force generated by the second valve group 600 and the third valve group 900 together is larger than that generated in the prior art, thereby expanding the adjustable gradient of the compressive damping force.

[0050] The number of the first valve plate 210, the second valve plate 610, and the third valve plate 910 is 14 or less, preferably 10 or less. The thickness of the first valve plate 210, the second valve plate 610, and the third valve plate 910 is 0.1-0.4 mm, more preferably 0.15-0.25 mm. In practical applications, the first valve plate 210, the second valve plate 610, and the third valve plate 910 with larger thicknesses can be selected. Increasing the thickness reduces the number of first valve plates 210, the second valve plate 610, and the third valve plate 910 used, thereby better controlling the tightness of the contact fit between components. In this embodiment, the first valve plate 210, the second valve plate 610, and the third valve plate 910 with the same outer diameter use the same thickness.

[0051] refer to Figure 1 The middle part of the flow valve body 300 facing the piston 400 is concave inward in the direction away from the piston 400. This makes the flow valve body 300 lower in the middle and higher on both sides. When the locking member 800 locks the various structures on the piston rod, the flow valve body 300 is slightly deformed by force, so that the flow valve body 300 fits the piston 400 more tightly and avoids the risk of oil leakage.

[0052] refer to Figure 1 The middle part of the side of the recovery valve body 500 facing the piston 400 is concave inward in the direction away from the piston 400. This makes the middle of the recovery valve body 500 lower and the two sides higher. When the locking member 800 locks the various structures on the piston rod, the recovery valve body 500 is slightly deformed by force, so that the recovery valve body 500 fits the piston 400 more tightly and avoids the risk of oil leakage.

[0053] A shock absorber includes the aforementioned recovery valve assembly.

[0054] A vehicle includes the aforementioned shock absorber.

[0055] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent device transformations made based on the contents of this utility model specification and drawings under the utility model concept, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A recovery valve assembly, characterized in that, The recovery valve assembly, which is fitted onto the piston rod, includes: First limiting component; The first valve plate group is disposed on one side of the first limiting member; A flow valve body is disposed on the side of the first valve plate group away from the first limiting member. The flow valve body has a first valve hole. The flow valve body includes different specifications, and the diameter of the first valve hole of the flow valve body of different specifications is different. A piston is disposed on the side of the flow valve body opposite to the first valve plate group, and the piston has a through hole; a recovery valve body is disposed on the side of the piston opposite to the flow valve body, and has a second valve hole. The recovery valve body includes different specifications, and the diameter of the second valve hole of the recovery valve body of different specifications is different. The second valve plate group is disposed on the side of the recovery valve body opposite to the piston; The second limiting member is disposed on the side of the second valve plate group piston away from the restoration valve body; A locking element is disposed on the side of the second limiting element away from the second valve plate assembly. The locking element is used to tightly attach and lock the second limiting element, the second valve plate assembly, the recovery valve body, the piston, the flow valve body, the first valve plate assembly, and the first limiting element onto the piston rod.

2. The recovery valve assembly as described in claim 1, characterized in that, The diameter of the first valve orifice is 1-2.5mm, and the diameter of the second valve orifice is 1-2.5mm.

3. The recovery valve assembly as described in claim 1, characterized in that, The first valve plate group includes a plurality of first valve plates arranged sequentially, with the outer diameter of each first valve plate not less than the outer diameter of the adjacent first valve plate along the direction of the flow valve body pointing towards the first limiting member; the second valve plate group includes a plurality of second valve plates arranged sequentially, with the outer diameter of each second valve plate not less than the outer diameter of the adjacent second valve plate along the direction of the recovery valve body pointing towards the second limiting member.

4. The recovery valve assembly as described in claim 3, characterized in that, The first valve plate group further includes a first throttling valve plate and a first fulcrum valve plate. A plurality of the first valve plates are located between the first throttling valve plate and the first fulcrum valve plate. The first throttling valve plate is located between the flow valve body and the plurality of the first valve plates. The outer diameter of the first throttling valve plate is the same as the outer diameter of the first valve plate with the largest outer diameter among the plurality of the first valve plates. The outer diameter of the first fulcrum valve plate is smaller than the outer diameter of the first valve plate with the smallest outer diameter among the plurality of the first valve plates. The second valve plate group also includes a second throttling valve plate and a second fulcrum valve plate. A plurality of second valve plates are located between the second throttling valve plate and the second fulcrum valve plate. The second throttling valve plate is located between the flow valve body and the plurality of second valve plates. The outer diameter of the second throttling valve plate is the same as the outer diameter of the second valve plate with the largest outer diameter among the plurality of second valve plates. The outer diameter of the second fulcrum valve plate is smaller than the outer diameter of the second valve plate with the smallest outer diameter among the plurality of second valve plates.

5. The recovery valve assembly as described in claim 4, characterized in that, The number of first valve plates with the same outer diameter as the first throttling valve plate is two or more; the number of second valve plates with the same outer diameter as the second throttling valve plate is two or more.

6. The recovery valve assembly as described in claim 3, characterized in that, The recovery valve assembly further includes a third valve plate group, which is disposed between the second valve plate group and the second limiting member. The third valve plate group includes a plurality of third valve plates arranged sequentially. In the direction from the recovery valve body to the second limiting member, the outer diameter of each of the plurality of third valve plates is not less than the outer diameter of the adjacent third valve plate.

7. The recovery valve assembly as described in claim 6, characterized in that, The outer diameter of the second valve plate in the second valve plate group with the largest outer diameter is 22mm or more, and the outer diameter of the third valve plate in the third valve plate group with the largest outer diameter is 24mm or more.

8. The recovery valve assembly as described in claim 1, characterized in that, The flow valve body has a concave center on the side facing the piston, moving away from the piston, and / or the recovery valve body has a concave center on the side facing the piston, moving away from the piston.

9. A vibration damper, characterized in that, Includes the recovery valve assembly as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the vibration damper as described in claim 9.

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