Filter structure for variable damping shock absorber and shock absorber with filter structure

Abstract

The utility model relates to the field of shock absorbers, in particular to a filter structure for a variable damping shock absorber and a shock absorber with the filter structure, which comprises an oil inlet filter screen or / and an oil outlet filter screen. The oil inlet filter screen is arranged at an oil inlet of an electromagnetic valve in the shock absorber; the oil outlet filter screen is arranged at an oil outlet of an electromagnetic valve or / and a connecting body in the shock absorber; through the arrangement of the filtering structure, it can be guaranteed that oil entering and exiting the electromagnetic valve is filtered through the filtering net, and the clamping stagnation risk of the electromagnetic valve is reduced; and meanwhile, through cooperative use of the oil inlet filter screen and the oil outlet filter screen, it is guaranteed that oil, entering the electromagnetic valve, of the variable damping shock absorber is filtered through the filter screens no matter under any working condition, foreign matter is effectively prevented from entering the electromagnetic valve, and therefore the clamping stagnation risk of the electromagnetic valve is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of shock absorber, and specifically is a filter structure for variable damping shock absorber and shock absorber with the filter structure. BACKGROUND

[0002] The electromagnetic valve as the core part of the variable damping shock absorber plays an irreplaceable role in adjusting the damping of the shock absorber. In addition to the manufacturing and assembly precision of the electromagnetic valve itself affecting the performance of the product, the pollutant stagnation is also one of the important reasons leading to the failure of the variable damping shock absorber. The common way to reduce the risk of stagnation at present is:

[0003] 1. Improve the machining and assembly cleanliness requirements of the shock absorber and electromagnetic valve parts;

[0004] 2. Add a magnet to the shock absorber.

[0005] The above two methods have the following problems:

[0006] The cleanliness requirement of the parts is high, and the cleaning, testing and management cost is high. New impurities will be generated as the use time of the shock absorber increases;

[0007] The magnet cannot adsorb non-ferrous metal and non-metal particles.

[0008] The existing patent CN 213575292 U - a shock absorber electromagnetic valve and shock absorber connection structure does not clearly solve the above technical problems.

[0009] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing shock absorber structure. INVENTION CONTENTS

[0010] The utility model aims at providing a filter structure which can be applied to the variable damping shock absorber and can reduce the risk of electromagnetic valve stagnation.

[0011] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0012] A filter structure for variable damping shock absorber, comprising an oil inlet filter screen and / or an oil outlet filter screen; the oil inlet filter screen is arranged at the oil inlet of the electromagnetic valve in the shock absorber; the oil outlet filter screen is arranged at the oil outlet of the electromagnetic valve or / and the connecting body in the shock absorber.

[0013] The oil inlet filter screen comprises a first oil inlet filter screen; the first oil inlet filter screen comprises a filter screen body, and the filter screen body is provided with filter holes.

[0014] The filter screen body comprises an outer ring body; the outer ring body is provided with a middle protrusion; the outer ring body is further provided with a middle through hole; the middle through hole extends from the outer ring body to the inside of the middle protrusion; the middle protrusion is provided with a filter hole.

[0015] The middle protrusion is arc-shaped away from the side of the outer ring body; the filter screen body is in the shape of a round cap; during installation, the middle protrusion on the first oil inlet filter screen is arranged on the outer ring body and faces the side close to the oil inlet of the electromagnetic valve or the cylinder body of the shock absorber.

[0016] The oil outlet filter screen comprises a first oil outlet filter screen; the first oil outlet filter screen is arranged at the oil outlet of the connecting body.

[0017] The oil outlet filter screen comprises a main oil outlet filter screen; the main oil outlet filter screen is connected to the main oil outlet of the electromagnetic valve.

[0018] The horizontal projection of the main oil outlet filter screen is in the shape of a ring; the main oil outlet filter screen is sleeved on the main valve shell of the electromagnetic valve.

[0019] The oil outlet filter screen further comprises a pilot oil outlet filter screen; the pilot oil outlet filter screen is arranged at the pilot oil outlet of the electromagnetic valve.

[0020] The oil inlet filter screen or the oil outlet filter screen is formed by stamping, weaving or etching.

[0021] A shock absorber comprises a cylinder body, wherein the cylinder body is provided with an electromagnetic valve; the electromagnetic valve and the cylinder body are connected through a connecting body; the electromagnetic valve is provided with a filter structure for a variable-damping shock absorber; the oil inlet filter screen in the filter structure is arranged at a position between the connecting body and the electromagnetic valve.

[0022] The filter structure for a variable-damping shock absorber has the following advantages:

[0023] The utility model discloses a kind of filter structures for variable-damping shock absorber and the shock absorber with the filter structure.

[0024] The utility model discloses a kind of filter structures for variable-damping shock absorber and the shock absorber with the filter structure.

[0025] Meanwhile, by the cooperation of the oil inlet filter screen and the oil outlet filter screen, it is guaranteed that the oil entering the electromagnetic valve under any working condition of the variable-damping shock absorber is filtered by the filter screen, effectively preventing foreign matters from entering the inside of the electromagnetic valve, thereby reducing the risk of electromagnetic valve jam. BRIEF DESCRIPTION OF DRAWINGS

[0026] The contents expressed by each drawing of the utility model specification and the marks in the drawing are briefly explained as follows:

[0027] Figure 1The utility model discloses a structure schematic drawing of first oil inlet filter screen and oil outlet filter screen installation on the shock absorber.

[0028] Figure 2 The utility model discloses a structure schematic drawing of first oil inlet filter screen and oil outlet filter screen installation on the shock absorber.

[0029] Figure 3 The utility model discloses a structure schematic drawing of first oil inlet filter screen and oil outlet filter screen installation on the shock absorber.

[0030] Figure 4 The utility model discloses a structure schematic drawing of first oil inlet filter screen and oil outlet filter screen installation on the shock absorber.

[0031] Figure 5 The utility model discloses a structure schematic drawing of first oil inlet filter screen and oil outlet filter screen installation on the shock absorber.

[0032] Figure 6 The utility model discloses a structure schematic drawing of first oil inlet filter screen and oil outlet filter screen installation on the shock absorber.

[0033] The mark in above -mentioned drawing is all:

[0034] 10, solenoid valve, 20 first oil inlet filter screen, 30, first oil outlet filter screen, 40, connecting body, 11, main valve shell, 22, main oil outlet, 201, outer ring body, 202, middle bulge, 31, main oil outlet filter screen, 32, pilot oil outlet filter screen. DETAILED DESCRIPTION

[0035] The utility model discloses a structure schematic drawing of first oil inlet filter screen and oil outlet filter screen installation on the shock absorber.

[0036] A filter structure for a variable damping shock absorber, comprising an oil inlet filter screen and / or an oil outlet filter screen, the oil inlet filter screen is arranged at an oil inlet of a solenoid valve 10 in the shock absorber, and the oil outlet filter screen is arranged at an oil outlet of the solenoid valve 10 and / or a connecting body 40 in the shock absorber.

[0037] Meanwhile, through cooperation of the oil inlet filter screen and the oil outlet filter screen, it is guaranteed that oil entering the solenoid valve 10 under any working condition of the variable damping shock absorber is filtered by the filter screen, foreign matters are effectively prevented from entering the solenoid valve 10, and thus the risk of the solenoid valve 10 being stuck is reduced.

[0038] The filter structure is mainly suitable for the shock absorber, and mainly filters and protects oil inlet and oil outlet of the solenoid valve 10.

[0039] Specifically, the filtering structure disclosed by the utility model mainly includes an oil inlet filter screen and / or an oil outlet filter screen; the oil inlet filter screen is arranged at an oil inlet of the electromagnetic valve 10 in the shock absorber; the oil outlet filter screen is arranged at an oil outlet of the electromagnetic valve 10 or the connecting body 40 in the shock absorber; in the utility model, the oil inlet filter screen is used for filtering oil liquid entering the electromagnetic valve 10; the oil outlet filter screen is used for filtering oil liquid flowing out of the electromagnetic valve 10 or the connecting body 40; the filtering structure disclosed by the utility model can be used singly, simultaneously or when the filtering structure is applicable to the shock absorber, the oil inlet filter screen and the oil outlet filter screen can be simultaneously contained or only one of them can be contained.

[0040] In the utility model, the oil inlet filter screen is installed at the oil inlet of the electromagnetic valve 10 in the shock absorber; when the shock absorber works, oil liquid enters the electromagnetic valve 10 after being filtered by the oil inlet filter screen, thereby preventing impurities from entering the inside of the electromagnetic valve 10 and reducing the risk of the electromagnetic valve 10 being stuck.

[0041] The arrangement position of the oil outlet filter screen: the oil outlet filter screen can be installed at the oil outlet of the electromagnetic valve 10 in the shock absorber, at the oil outlet of the connecting body 40 or at the positions of both.

[0042] In addition, in the utility model, the oil outlet of the electromagnetic valve 10 can be the main oil outlet 22 or the pilot oil outlet on the electromagnetic valve 10; the oil outlet of the connecting body 40 in the utility model can be the total oil outlet 41 on the connecting body.

[0043] When the shock absorber does not work (such as carrying, installing and storing), oil liquid enters the electromagnetic valve 10 after being filtered by the oil outlet filter screen under the action of gravity, thereby preventing impurities from entering the inside of the electromagnetic valve 10 and further reducing the risk of the electromagnetic valve 10 being stuck.

[0044] Further, in the utility model, the oil inlet filter screen includes a first oil inlet filter screen 20; the first oil inlet filter screen 20 includes a filter screen body, and filter holes are arranged on the filter screen body; the filter screen body is the main structure of the oil inlet filter screen, and the filter holes are arranged to facilitate subsequent oil liquid to pass through the oil inlet filter screen and facilitate subsequent oil inlet operation.

[0045] Filter screen body: this is the core component of the oil inlet filter screen and is the main structure part of the oil inlet filter screen, and the filter holes are mainly arranged on the filter screen body and are used for filtering impurities in oil liquid; the size, shape and distribution of the filter holes directly affect the filtering effect and the flow capacity of oil liquid.

[0046] Further, in the utility model, the filter screen body includes outer ring body 201, the outer ring body 201 is equipped with middle part protruding 202, the outer ring body 201 is also equipped with middle part through-hole, the middle part through-hole extends from the outer ring body 201 to the inside of middle part protruding 202, the middle part protruding 202 is equipped with filter hole, outer ring body 201: this is the main part of filter screen body, plays the role of support and fixed, middle part protruding 202: the central position of outer ring body 201, the structure that protrudes outward, middle part through-hole: the hole channel that extends from the outer ring body 201 to the inside of middle part protruding 202, is used for the flow of oil, filter hole: set up in middle part protruding 202, is used for filtering the impurity in oil.

[0047] The role of middle part protruding 202, increase filter area: the design of middle part protruding 202 increases the surface area of filter screen, to improve the filtering efficiency, can be inserted in the main valve seat of solenoid valve 10 simultaneously, and the protruding structure can guide the flow of oil, reduce local pressure concentration, and optimize the flow performance of oil.

[0048] The middle part through-hole connects the outer ring body 201 and the middle part protruding 202, to ensure that the oil can smoothly pass through the filter screen into the solenoid valve 10, and the design of the through-hole can enhance the structural stability of the filter screen body to prevent deformation under the action of high-pressure oil.

[0049] Further, in the utility model, the middle part protruding 202 is arc-shaped away from the outer ring body 201, and the filter screen body is in the shape of a round cap, the arc-shaped design of the middle part protruding 202 is arc-shaped away from the outer ring body 201, and the arc-shaped design has the following key roles: optimizing oil flow, the arc-shaped surface can guide the smooth flow of oil, reduce flow resistance and turbulence, thereby improving the flow efficiency of oil, increasing filter area, the arc-shaped structure can provide a larger surface area than the planar structure, thereby increasing the number of filter holes and the filter area and improving the filtering efficiency, and structural strength, the arc-shaped structure can better disperse oil pressure, enhance the structural strength of the middle part protruding 202, and prevent deformation under the action of high-pressure oil.

[0050] The overall shape of the filter screen body is in the shape of a round cap, and the design has the following advantages: uniform distribution of pressure, the round cap structure can uniformly distribute oil pressure on the surface of the filter screen, reduce local stress concentration, thereby prolonging the service life of the filter screen, increase filter area, compared with the planar filter screen, the round cap structure can provide a larger effective filter area, further improving the filtering efficiency, and optimize space utilization, the round cap design can better adapt to the compact space inside the shock absorber without reducing the flow capacity.

[0051] During installation, the middle protrusion on the first oil inlet filter screen is arranged on the outer ring body towards the side close to the oil inlet of the electromagnetic valve or the shock absorber cylinder; based on this design, it can be known that the middle protrusion in the structure thereof can be arranged towards the side close to the oil inlet of the electromagnetic valve or the shock absorber cylinder according to needs during installation of the first oil inlet filter screen; the basic role of this arrangement is to ensure that the oil can smoothly pass through the first oil inlet filter screen for filtration before entering the electromagnetic valve.

[0052] In the utility model, the middle protrusion is located at the center position of the outer ring body and protrudes outward, and filter holes are arranged on the middle protrusion and used for filtering impurities in the oil.

[0053] In specific implementation;

[0054] When the middle protrusion on the first oil inlet filter screen is arranged towards the oil inlet of the electromagnetic valve; this arrangement mode mainly conforms to the flow direction of the oil, reduces the running resistance of the oil, and meanwhile the oil inlet on the electromagnetic valve can play a good binding and limiting role, better ensuring the accuracy and stability of the arrangement position of the first oil inlet filter screen.

[0055] In addition, in the utility model, the oil will first pass through the filter holes on the middle protrusion for filtration before entering the electromagnetic valve; this arrangement mode can effectively prevent impurities from entering the inside of the electromagnetic valve and reduce the risk of electromagnetic valve jamming.

[0056] The arc-shaped design of the middle protrusion can optimize the oil flow, reduce the flow resistance and turbulence phenomenon, and increase the filtration area and improve the filtration efficiency.

[0057] When the first oil inlet filter screen is arranged towards the shock absorber cylinder; when the oil flows from the shock absorber cylinder to the electromagnetic valve, will also first pass through the filter holes on the middle protrusion for filtration; because the side close to the shock absorber cylinder of the electromagnetic valve has a larger arrangement space, the problem of installation interference between the first oil inlet filter screen and adjacent components during arrangement of the first oil inlet filter screen is reduced, that is, by using the above arrangement mode, the first oil inlet filter screen can be directly inserted on the connecting body; the internal space of the electromagnetic valve occupied by the first oil inlet filter screen is reduced; and then the arrangement difficulty of the first oil inlet filter screen is reduced.

[0058] Further, in the utility model, the oil outlet filter screen comprises a first oil outlet filter screen 30; the first oil outlet filter screen 30 is arranged at the oil outlet of the connecting body 40; the first oil outlet filter screen 30 is installed at the oil outlet of the connecting body 40; the connecting body 40 is a component for connecting the electromagnetic valve 10 and the outer cylinder in the shock absorber, and the oil outlet filter screen plays a role of filtering the oil flowing from the outer cylinder of the shock absorber to the electromagnetic valve 10 at this position.

[0059] Further, in the utility model, the oil outlet filter screen includes a main oil outlet filter screen 31, the main oil outlet filter screen 31 is connected on the main oil outlet 22 of the electromagnetic valve 10, the main oil outlet filter screen 31 is an important component of the oil outlet filter screen, and is specially used for filtering the oil flowing out from the main oil outlet 22 of the electromagnetic valve 10.

[0060] The main oil outlet filter screen 31 is installed on the main oil outlet 22 of the electromagnetic valve 10 and directly connected with the main oil passage of the electromagnetic valve 10, and the main function of the main oil outlet filter screen 31 is to filter the oil flowing out from the main oil outlet 22 of the electromagnetic valve 10, preventing impurities from entering other components (such as the outer cylinder or other hydraulic systems) of the shock absorber, which helps to keep the entire hydraulic system clean and reduce the failure caused by impurities.

[0061] Further, in the utility model, the main oil outlet filter screen 31 is horizontally projected in a ring shape, the main oil outlet filter screen 31 is sleeved on the main valve shell 11 of the electromagnetic valve 10, and based on the arrangement, the main oil ports in the circumferential direction of the main valve body of the electromagnetic valve 10 can be plugged, and subsequent oil outlet filtering is facilitated.

[0062] The horizontal projection of the main oil outlet filter screen 31 is in a ring shape, and the main purpose of the design is to increase the filtering area: the ring structure can provide a larger filtering area, thereby improving the filtering efficiency, and facilitate the subsequent sleeving and installation on the main valve shell 11.

[0063] In the utility model, the main oil outlet filter screen 31 is sleeved on the main valve shell 11 of the electromagnetic valve 10, and the installation mode is compact in structure: directly sleeving on the main valve shell 11, reducing the requirement for additional installation space.

[0064] Further, in the utility model, the oil outlet filter screen further includes a pilot oil outlet filter screen 32, the pilot oil outlet filter screen 32 is arranged at the pilot oil outlet of the electromagnetic valve 10, the pilot oil outlet filter screen 32 is installed at the pilot oil outlet of the electromagnetic valve 10, and the main function of the pilot oil outlet filter screen 32 is to filter the oil flowing out from the pilot valve; the design ensures that the oil in the pilot system is filtered before entering other associated components.

[0065] Further, in the utility model, the oil inlet filter screen or the oil outlet filter screen is formed by stamping, weaving or etching, and based on the above design, the processing and forming of the oil inlet filter screen or the oil outlet filter screen are facilitated.

[0066] The stamping forming is a traditional filter screen manufacturing process, and the filter screen shape and aperture are formed by applying pressure to the metal plate through a die.

[0067] The characteristic is high production efficiency, and is suitable for mass production.

[0068] The weaving forming is to manufacture the filter screen by weaving the metal wire into a net structure.

[0069] Its characteristics are that it can realize a larger filtering area, and is suitable for various shapes and sizes.

[0070] Etching forming is a process of forming holes and shapes on metal plates through chemical corrosion method.

[0071] Its characteristics are that the etching process can realize very high machining precision, the minimum hole diameter can reach 0.05mm, and the tolerance can be controlled within ±0.0075mm; since it does not involve mechanical processing, the surface of the etching formed product is free of burrs and pressure points, which does not affect the product function; etching can realize complex shapes and patterns that stamping and weaving cannot complete, such as brand logos, etc.

[0072] A shock absorber, comprising a cylinder, an electromagnetic valve 10 is arranged on the cylinder; the electromagnetic valve 10 is connected with the cylinder through a connecting body 40; the electromagnetic valve 10 is provided with a filter structure for a variable damping shock absorber; the oil inlet filter screen in the filter structure is arranged between the connecting body 40 and the electromagnetic valve 10.

[0073] The shock absorber disclosed by the utility model mainly comprises the following structures:

[0074] Cylinder: as the main structure of the shock absorber, used for accommodating oil and other components.

[0075] Electromagnetic valve 10: installed on the cylinder, used for controlling the flow of oil, thereby adjusting the damping force.

[0076] Connecting body 40: used for connecting the electromagnetic valve 10 and the cylinder, ensuring the stability of the structure and the smooth flow of oil.

[0077] Filter structure: comprising an oil inlet filter screen and an oil outlet filter screen, used for filtering impurities in the oil, ensuring the normal work of the electromagnetic valve 10.

[0078] Oil inlet filter screen: arranged between the connecting body 40 and the electromagnetic valve 10; this design ensures that the oil is filtered before entering the electromagnetic valve 10, prevents impurities from entering the inside of the electromagnetic valve 10, and reduces the risk of jamming.

[0079] Oil outlet filter screen: the oil outlet filter screen will be installed at the oil outlet of the electromagnetic valve 10, used for filtering the oil flowing out of the electromagnetic valve 10.

[0080] Filtering function: the oil inlet filter screen and the oil outlet filter screen respectively filter the oil entering and flowing out of the electromagnetic valve 10, ensuring the cleanliness of the oil and improving the reliability of the system.

[0081] By filtering impurities in the oil, the risk of jamming of the electromagnetic valve 10 is reduced, and the service life of the shock absorber is prolonged.

[0082] Compact design: the oil inlet filter screen is arranged between the connecting body 40 and the electromagnetic valve 10, without increasing additional space, suitable for compact vehicle chassis design

[0083] The design of the shock absorber combines the dynamic adjustment capability of the electromagnetic valve 10 and the efficient filtering structure, and is suitable for a vehicle suspension system that requires high-precision damping control. Specific embodiments:

[0085] The utility model discloses a filtering structure mainly includes oil inlet filter screen and oil outlet filter screen, the oil inlet filter screen is set between connecting body 40 and electromagnetic valve 10 oil inlet, so that when recovering and compressing, oil all needs to flow through oil inlet filter screen after filtering to enter electromagnetic valve 10.

[0086] The oil outlet filter screen mainly includes a first oil outlet filter screen 30, a main oil outlet filter screen 31 and a pilot oil outlet filter screen 32.

[0087] The first oil outlet filter screen 30 is arranged between the connecting body 40 and the oil outlet of the electromagnetic valve 10, so that when the shock absorber is not working, the oil flows through the first oil outlet filter screen 30 under the action of gravity and then enters the electromagnetic valve 10.

[0088] The first oil inlet filter screen 20 is preferably provided with a protruding non-planar shape, such as a protruding round cap shape, so as not to reduce the oil inlet flow section.

[0089] The first oil outlet filter screen 30 is arranged at the total oil outlet; the main oil outlet filter screen 31 is arranged at the main oil outlet, and the pilot oil outlet filter screen 32 is arranged at the pilot oil outlet.

[0090] The oil inlet filter screen and the oil outlet filter screen can be installed in any position between the variable damping shock absorber, the electromagnetic valve 10, the connecting body 40, the electromagnetic valve 10 and the connecting body 40, etc. by various ways, and the oil inlet filter screen and the oil outlet filter screen can be arranged at the same time, or only one of them can be arranged.

[0091] The oil inlet filter screen or the oil outlet filter screen can be made of thin steel sheet punched small holes or chemical etched small holes, or can be manufactured by steel wire weaving method, and the filter screens of different manufacturing methods can be used at the same time or combined respectively.

[0092] The shock absorber structure disclosed by the utility model can ensure that the oil entering the electromagnetic valve 10 of the variable damping shock absorber under any working condition is filtered by the filter screen, effectively prevents foreign matters from entering the inside of the electromagnetic valve 10, and reduces the risk of electromagnetic valve 10 sticking.

[0093] When the shock absorber works, in the recovery stroke, the piston rod moves upward, the oil in the upper chamber of the piston valve is compressed, part of the oil in the upper chamber of the piston valve enters the middle cylinder, and then enters the electromagnetic valve 10 through the oil inlet filter screen arranged between the inlet of the electromagnetic valve 10 and the connecting body 40, and then flows into the outer cylinder of the shock absorber through the first oil outlet filter screen 30 arranged between the electromagnetic valve 10 and the connecting body 40; at this time, the oil inlet of the electromagnetic valve 10 is high pressure, and the oil outlet is low pressure, the oil entering the electromagnetic valve 10 is filtered, and the risk of electromagnetic valve 10 sticking is reduced.

[0094] In the compression stroke, the piston rod moves downward, the oil in the lower chamber of the piston valve is compressed, part of the oil in the lower chamber enters the upper chamber of the piston valve, flows to the middle cylinder, and then enters the electromagnetic valve 10 through the oil inlet filter screen arranged between the inlet of the electromagnetic valve 10 and the connecting body 40, and then flows into the outer cylinder of the shock absorber through the oil outlet filter screen arranged between the electromagnetic valve 10 and the connecting body 40; at this time, the oil inlet of the electromagnetic valve 10 is still high pressure, and the oil outlet is low pressure, the oil entering the electromagnetic valve 10 is filtered, and the risk of electromagnetic valve 10 sticking is reduced.

[0095] When the shock absorber does not work (transportation, installation, storage, etc.), the oil in the shock absorber flows under the action of gravity, and the oil may enter the electromagnetic valve 10 from the outer cylinder of the shock absorber through the connecting body 40 and the oil outlet filter screen arranged between the connecting body 40 and the outlet of the electromagnetic valve 10; at this time, the oil inlet filter screen can filter the oil entering the electromagnetic valve 10, thereby effectively preventing foreign matter from entering the inside of the electromagnetic valve 10, and reducing the risk of electromagnetic valve 10 sticking.

[0096] Obviously, the specific implementation of the utility model is not limited by the above-mentioned mode, as long as various non-essential improvements are made by adopting the method concept and technical scheme of the utility model, which are within the protection scope of the utility model.

Claims

1. A filter structure for a variable damping shock absorber, characterized by, The filter structure comprises an oil inlet filter screen and / or an oil outlet filter screen; the oil inlet filter screen is arranged at an oil inlet of the electromagnetic valve (10) in the shock absorber; and the oil outlet filter screen is arranged at an oil outlet of the electromagnetic valve (10) and / or the connecting body (40).

2. The filtering structure for a variable-damping shock absorber according to claim 1, wherein The oil inlet filter screen comprises a first oil inlet filter screen (20); and the first oil inlet filter screen (20) comprises a filter screen body provided with filter holes.

3. The filtering structure for a variable-damping shock absorber according to claim 2, wherein The filter screen body comprises an outer ring body (201); the outer ring body (201) is provided with a middle protrusion (202); the outer ring body (201) is further provided with a middle through hole; the middle through hole extends from the outer ring body (201) to the inside of the middle protrusion (202); and the middle protrusion (202) is provided with filter holes.

4. The filtering structure for a variable-damping shock absorber according to claim 3, wherein The middle protrusion (202) is arc-shaped away from the outer ring body (201); the filter screen body is in the shape of a circular cap; and during installation, the middle protrusion on the first oil inlet filter screen is arranged on the outer ring body towards the side close to the oil inlet of the electromagnetic valve or the cylinder body of the shock absorber.

5. The filtering structure for a variable-damping shock absorber according to claim 1, wherein The oil outlet filter screen comprises a first oil outlet filter screen (30); and the first oil outlet filter screen (30) is arranged at the oil outlet of the connecting body (40).

6. The filtering structure for a variable-damping shock absorber according to any one of claims 1 or 5, characterized in that, The oil outlet filter screen comprises a main oil outlet filter screen (31) connected to the main oil outlet (22) of the electromagnetic valve (10).

7. The filtering structure for a variable-damping shock absorber according to claim 6, wherein The main oil outlet filter screen (31) is horizontally projected in the shape of a ring; and the main oil outlet filter screen (31) is sleeved on the main valve shell of the electromagnetic valve (10).

8. The filtering structure for a variable damping shock absorber according to any one of claims 1 or 5, characterized in that, The oil outlet filter screen further comprises a pilot oil outlet filter screen (32) arranged at the pilot oil outlet of the electromagnetic valve (10).

9. The filtering structure for a variable-damping shock absorber according to claim 2, wherein The oil inlet filter screen or the oil outlet filter screen is formed by stamping, weaving or etching.

10. A damper characterized by, The filter structure comprises a cylinder body provided with an electromagnetic valve (10); the electromagnetic valve (10) and the cylinder body are connected through a connecting body (40); the electromagnetic valve (10) is provided with the filter structure for a variable-damping shock absorber according to any one of claims 1-9; and the oil inlet filter screen in the filter structure is arranged at a position between the connecting body (40) and the electromagnetic valve (10).

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