Impact-resistant magnetorheological damper

Abstract

The invention provides an anti-impact magneto-rheological damper which comprises a cylinder body, a damping device and a damping device. The interior of the cylinder body is suitable for containing magneto-rheological fluid. The piston assembly is arranged in the cylinder body in a sliding mode, the space in the cylinder body is divided into an upper space and a lower space by the piston assembly, and the piston assembly comprises a piston upper end cover with a first through hole formed in the center; a second through hole is formed in the center of the piston lower end cover; the annular permanent magnet is clamped between the piston upper end cover and the piston lower end cover, and the inner ring space of the annular permanent magnet, the first through hole and the second through hole are coaxially arranged; the magnetic isolation ring is arranged on the outer side of the annular permanent magnet in a sleeving manner; the coil mounting cylinder is arranged on the outer side of the magnetism isolating ring; the excitation coil is wound on the coil mounting cylinder; and the piston cylinder body is arranged on the outer side of the coil mounting barrel in a sleeving mode and connected with the piston upper end cover and the piston lower end cover in a sealed mode, a gap exists between the inner side wall of the piston cylinder body and the magnet exciting coil, and the upper end and the lower end of the gap are provided with radial channels communicating with the first through hole and the second through hole in the radial direction correspondingly.

Description

Technical Field

[0001] The present disclosure relates to the field of impact protection, and in particular to an impact-resistant magnetorheological damper capable of adaptively changing a flow channel. Background Art

[0002] In scenarios such as aircraft takeoff and landing, soft landing of spacecraft, and recoil suppression of large artillery, dampers are widely used in such high-speed impact situations in order to reduce the damage caused by excessive speed and energy to the safety of vehicles and people. Common anti-impact dampers include hydraulic dampers, which eliminate or buffer vibration shocks through fluid viscosity and inertia; air spring dampers, which use the compressibility and elasticity of gas to absorb energy and reduce shock and vibration; elastic dampers, which use the flexibility and energy absorption capacity of elastic materials to slow down or eliminate shock and vibration. They are usually made of polymers, rubber or metal springs and can be customized as needed; friction dampers, which use the friction between materials to slow down or eliminate shock and vibration. Friction dampers are usually made of metal or composite materials, and the friction coefficient of the material can be adjusted as needed; magnetic fluid dampers use the rheological properties and magnetic field control of magnetic fluids to slow down or eliminate vibration and impact, and are suitable for high-speed and high-quality systems. Among them, magnetorheological dampers are widely used in large engineering machinery because of their advantages of fast response speed and high precision. Therefore, after optimizing the structure of the traditional magnetorheological damper, the novel impact-resistant magnetorheological damper was designed.

[0003] Magnetorheological fluid is an intelligent material composed of a liquid carrier, iron-containing particles with a diameter of about a few microns, and a surfactant additive to prevent particle sedimentation. Under the action of an external magnetic field, it can instantly (millimeter level) change its various physical properties such as apparent viscosity and plasticity. It can transform from a free-flowing liquid to a semi-solid and exhibit a controllable yield strength, and this change is reversible. The damper made based on the properties of magnetorheological fluid has a simple structure, fast response speed, a large dynamic range of damping force, good durability, and can still function even if the system loses control, and has high reliability.

[0004] In the current development of magnetorheological dampers, people are pursuing the goal of increasing the maximum output force of the damper and the dynamic adjustable range of the damping force. Generally, once the internal flow channel of such dampers is designed, the flow channel will no longer change during use, and the damper channel will directly affect the damping force output. This causes the uncontrollable viscous damping force of such dampers to increase sharply in high-speed scenarios. In some scenarios where the maximum damping force needs to be controlled, such as aircraft landing gear and seat suspension, exceeding the damage limit of the load makes it difficult to protect the safety of the equipment and occupants. Summary of the invention

[0005] In order to solve the above technical problems, the embodiment of the present disclosure discloses an impact-resistant magnetorheological damper, which can output stable damping force at low, medium and high speeds respectively, especially reducing the occurrence of force spikes at high speeds, thereby ensuring the reliability of the damper.

[0006] According to an embodiment of one aspect of the present disclosure, there is provided an anti-shock magnetorheological damper, comprising:

[0007] A cylinder body, the interior of which is suitable for containing magnetorheological fluid;

[0008] A piston assembly is slidably disposed in the cylinder body, and the piston assembly divides the space in the cylinder body into an upper space and a lower space. The piston assembly includes:

[0009] The piston upper end cover has a first through hole at the center;

[0010] The piston lower end cover has a second through hole at the center;

[0011] An annular permanent magnet is sandwiched between the piston upper end cover and the piston lower end cover, and the inner annular space of the annular permanent magnet is coaxially arranged with the first through hole and the second through hole;

[0013] A magnetic isolation ring, sleeved on the outer side of the annular permanent magnet;

[0014] A coil mounting cylinder is arranged outside the magnetic isolation ring;

[0015] an excitation coil, wound on the coil mounting cylinder;

[0016] A piston cylinder body is sleeved on the outside of the coil mounting cylinder, the piston cylinder body is sealed and connected to the piston upper end cover and the piston lower end cover respectively, there is a gap between the inner side wall of the piston cylinder body and the excitation coil, and radial channels communicating with the first through hole and the second through hole are respectively arranged at the upper and lower ends of the gap in the radial direction;

[0017] The inner annular space, the first through hole and the second through hole are configured as a first channel, the gap, the radial channel, the first through hole and the second through hole are configured as a second channel, in response to the movement speed of the piston assembly being lower than a preset threshold, the magnetorheological fluid flows only through the second channel, and in response to the movement speed of the piston assembly being greater than or equal to a preset threshold, the magnetorheological fluid flows through the first channel and the second channel at the same time.

[0018] According to some embodiments of the present disclosure, the anti-shock magnetorheological damper further includes:

[0019] One end of the piston rod can slide and seal through the first end of the cylinder body and then be connected to the piston upper end cover.

[0020] According to some embodiments of the present disclosure, the piston assembly further includes:

[0021] The piston core is a cylindrical structure made of soft magnetic material, and the piston core is arranged between the magnetic isolation ring and the coil installation cylinder.

[0022] According to some embodiments of the present disclosure, the anti-shock magnetorheological damper further includes:

[0023] A floating piston is slidably disposed inside the cylinder body, wherein the floating piston and the piston rod are respectively disposed on both sides of the piston assembly, wherein the floating piston separates an energy storage space at the second end of the cylinder body, and the energy storage space is suitable for filling with compressed gas of a preset strength.

[0024] According to some embodiments of the present disclosure, a first boss and a first positioning groove for positioning are respectively provided on the upper end surface of the piston cylinder body and the bottom surface of the piston upper end cover; and

[0025] The lower end surface of the piston cylinder body and the top surface of the piston lower end cover are respectively provided with a second boss and a second positioning groove that match each other for positioning.

[0026] According to some embodiments of the present disclosure, the cylinder body comprises:

[0027] Cylinder body;

[0028] An upper end cover is sealingly arranged at one end of the cylinder body, and a third through hole is arranged at the center of the upper end cover;

[0029] A lower end cover is sealingly disposed at the other end of the cylinder body;

[0030] The anti-shock magnetorheological damper also includes:

[0031] A guide ring is embedded in the third through hole, and the guide ring is slidably and sealingly connected to the piston rod.

[0032] According to some embodiments of the present disclosure, a stepped groove is provided on the guide ring, and the anti-shock magnetorheological damper further includes:

[0033] A skeleton oil seal is sealingly embedded in the stepped groove, and the skeleton oil seal is suitable for sealing the magnetorheological fluid in the cylinder body.

[0034] According to some embodiments of the present disclosure, a wire hole for passing a wire is provided on the upper end cover of the piston;

[0035] The piston rod is a hollow structure, the piston rod is connected to the wire hole, and a fourth through hole is opened on the side of the piston rod;

[0036] The anti-shock magnetorheological damper also includes:

[0037] A wire has one end electrically connected to the excitation coil, and the other end passes through the wire hole, the piston rod and the fourth through hole in sequence to facilitate connection with an external power source.

[0038] According to some embodiments of the present disclosure, the anti-shock magnetorheological damper further includes:

[0039] A graphite gasket is sleeved on the piston rod. The graphite gasket is arranged between the piston upper end cover and the first end. The graphite gasket is suitable for buffering the collision between the piston upper end cover and the first end.

[0040] According to some embodiments of the present disclosure, the piston assembly further includes:

[0041] The protrusion extends outward from the piston upper end cover along the axial direction of the piston upper end cover, the interior of the protrusion is hollow and connected to the first through hole, and the side of the protrusion is provided with a fifth through hole for the inflow / outflow of the magnetorheological fluid.

[0042] According to the impact-resistant magnetorheological damper of the disclosed embodiment, adaptive change of the flow path can be achieved through two relatively independent channels. In high-speed situations, the magnetorheological fluid in the middle of the permanent magnet hole of the damper is opened by pressure, the lower flow channel opens, and the damping force decreases, so that this new damper can output a relatively small uncontrollable viscous damping force in high-speed impact situations, and can output a stable damping force at low, medium and high speeds, especially reducing the occurrence of force peaks at high speeds, thereby ensuring the reliability of the damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a front view of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure;

[0044] Figure 2 Figure 1 A cross-sectional view of the shock-resistant magnetorheological damper shown;

[0045] Figure 3 is a cross-sectional view of a piston assembly of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure;

[0046] Figure 4 is a schematic diagram of the flow of magnetorheological fluid along a first channel and a second channel in a piston assembly of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure;

[0047] Figure 5A top view and a cross-sectional view schematically showing a piston core and adjacent parts of an anti-shock magnetorheological damper according to an embodiment of the present disclosure; and

[0048] Figure 6 is a perspective view of a piston assembly of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure.

[0049] In the above drawings, the meanings of the reference numerals are as follows:

[0050] 1- cylinder body;

[0051] 101- cylinder body;

[0052] 102-upper end cover;

[0053] 103-lower end cover;

[0054] 2-Piston assembly;

[0055] 201- piston upper end cover;

[0056] 2011-First through hole;

[0057] 202- piston lower end cover;

[0058] 2021-second through hole;

[0059] 203- annular permanent magnet;

[0060] 2031-Inner Ring Space;

[0061] 204-magnetic isolation ring;

[0062] 205-coil mounting cylinder;

[0063] 206-excitation coil;

[0064] 207-piston cylinder;

[0065] 208-piston core;

[0066] 2081-screw hole;

[0067] 209-prominence;

[0068] 2091-fifth through hole;

[0069] 3-piston rod;

[0070] 4-Floating piston;

[0071] 5-Guide ring;

[0072] 6-Skeleton oil seal;

[0073] W1 - first channel; and

[0074] W2 - Second channel. DETAILED DESCRIPTION

[0075] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0076] However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, the description of the known technology is omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0077] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0078] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0079] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0080] Once the internal flow channel of a general magnetorheological damper is designed, the flow channel will no longer change during use, and the damper channel will directly affect the damping force output. This causes the uncontrollable viscous damping force of this type of damper to increase sharply in high-speed scenarios, and the output damping force has high speed sensitivity. In some scenarios where it is necessary to control the peak damping force, such as aircraft landing gear and seat suspension, it is difficult to protect the safety of the equipment structure and occupants if the damage limit of the load is exceeded. In order to address the shortcomings of current magnetorheological dampers, the present disclosure proposes an impact-resistant magnetorheological damper with low speed sensitivity. This damper can output stable damping force at low, medium and high speeds, respectively, especially reduce the occurrence of force spikes at high speeds, and ensure the reliability of the damper.

[0081] Figure 1 is a front view of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure; Figure 2 Figure 1 A cross-sectional view of the shock-resistant magnetorheological damper shown; Figure 3 is a cross-sectional view of a piston assembly of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure; Figure 4 Schematic diagram of magnetorheological fluid flowing along a first channel and a second channel in a piston assembly of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure.

[0082] According to an embodiment of one aspect of the present disclosure, there is provided an impact-resistant magnetorheological damper, such as Figures 1 to 4 As shown, it includes a cylinder body 1 and a piston assembly 2.

[0083] According to some embodiments of the present disclosure, the interior of the cylinder 1 is suitable for containing magnetorheological fluid as a damping medium.

[0084] According to some embodiments of the present disclosure, the piston assembly 2 is slidably disposed in the cylinder body 1, and the piston assembly 2 divides the space inside the cylinder body into an upper space and a lower space. The piston assembly 2 includes a piston upper end cover 201, a piston lower end cover 202, an annular permanent magnet 203, a magnetic isolation ring 204, a coil mounting cylinder 205, an excitation coil 206 and a piston cylinder body 207.

[0085] According to some embodiments of the present disclosure, a first through hole 2011 is provided in the central area of ​​the piston upper end cover 201. A second through hole 2022 is provided in the center of the piston lower end cover 202. The annular permanent magnet 203 is sandwiched between the piston upper end cover 201 and the piston lower end cover 202, and the inner ring space 2031 of the annular permanent magnet 203 is coaxially arranged with the first through hole 2011 and the second through hole 2021. The magnetic isolation ring 204 is sleeved on the outside of the annular permanent magnet 203. The coil mounting cylinder 205 is arranged on the outside of the magnetic isolation ring 204. The excitation coil 206 is wound on the coil mounting cylinder 205. The piston cylinder 207 is sleeved on the outside of the coil mounting tube 205, and the piston cylinder 207 is sealed and connected to the piston upper end cover 201 and the piston lower end cover 202 respectively. There is a gap between the inner side wall of the piston cylinder 207 and the excitation coil 206, and radial channels connecting the first through hole 2011 and the second through hole 2021 are respectively arranged at the upper and lower ends of the gap in the radial direction. Among them, the inner annular space 2031, the first through hole 2011 and the second through hole 2021 are configured as a first channel W1, and the gap, the radial channel, the first through hole 2011 and the second through hole 2022 are configured as a second channel W2. In response to the movement speed of the piston assembly 2 being lower than the preset threshold, the magnetorheological fluid flows only through the second channel W2, and in response to the movement speed of the piston assembly 2 being greater than or equal to the preset threshold, the magnetorheological fluid flows through the first channel W1 and the second channel W2 at the same time.

[0086] In this embodiment, adaptive change of the flow channel can be achieved through two relatively independent channels W1 and W2. In high-speed situations, the magnetorheological fluid in the middle of the permanent magnet hole of the damper is pressed open, the lower flow channel opens, and the damping force decreases, so that this new damper can output a relatively small uncontrollable viscous damping force in high-speed impact situations, and can output stable damping force at low, medium and high speeds, especially reducing the occurrence of force peaks at high speeds, thereby ensuring the reliability of the damper.

[0087] According to some optional embodiments of the present disclosure, the magnetic field strength of the annular permanent magnet 203 is greater than the magnetic field strength generated by the normal operation of the excitation coil 206 . Under the influence of the annular permanent magnet 203, the magnetorheological fluid in the inner annular space 2031 becomes semi-solid and its viscosity increases; under the action of the magnetic field generated by the excitation coil 206, the viscosity of the magnetorheological fluid in the above-mentioned gap increases (but is less than the viscosity of the magnetorheological fluid in the inner annular space 2031). When the moving speed of the piston assembly 2 is lower than the preset threshold, the inner annular space 2031 is closed, and the magnetorheological fluid can only pass through the above-mentioned gap when flowing between the upper space and the lower space, that is, it can flow through the second channel W2. At this time, the damping force of the magnetorheological damper maintains a large damping force output; when the moving speed of the piston assembly 2 exceeds the preset threshold, the above-mentioned semi-solid is pushed out of the inner annular space 2031, and the inner annular space 2031 is opened. At this time, the first channel W1 and the second channel W2 are fully opened, and the magnetorheological fluid flows through the two channels. At this time, the damping force of the magnetorheological damper will not increase sharply with the increase in speed, but output a relatively appropriate damping force.

[0088] According to some optional embodiments of the present disclosure, in order to ensure that the magnetorheological damper has sufficient damping force when the magnetorheological fluid flows through the first channel W1 under high-speed state with large impact, the aperture of the first channel W1 is set to be larger, and the aperture range includes 4 to 6 mm.

[0089] According to some optional embodiments of the present disclosure, in order to ensure that the inner annular space 2031 is not opened by the magnetorheological fluid during the low-speed operation of the magnetorheological damper, the annular permanent magnet 203 uses a permanent magnet with a relatively large magnetic induction intensity. For example, the annular permanent magnet 203 uses a brand N52, which can generate a sufficiently large magnetic field at the center.

[0090] According to some embodiments of the present disclosure, a plurality of hollow holes connected to the first through hole are provided on the piston upper end cover 201 to facilitate the inflow and outflow of the magnetorheological fluid.

[0091] According to some embodiments of the present disclosure, the annular permanent magnet 203 is radially magnetized.

[0092] According to some embodiments of the present disclosure, the impact-resistant magnetorheological damper further includes a piston rod 3 , one end of which can slidably and sealingly pass through the first end of the cylinder body 1 and then be connected to the piston upper end cover 201 .

[0093] According to some embodiments of the present disclosure, one end of the piston rod 3 is provided with an external thread, the piston upper end cover 201 is provided with a threaded blind hole, and the piston rod 3 is connected to the piston upper end cover 201 through a threaded connection. Further optionally, the connection between the piston rod 3 and the piston upper end cover 201 is reinforced by metal glue.

[0094] Figure 5The top view and cross-sectional view of the piston core and adjacent parts of the impact-resistant magnetorheological damper according to the embodiment of the present disclosure are schematically shown.

[0095] According to some embodiments of the present disclosure, Figure 5 As shown, the piston assembly 2 further includes a piston core 208, which is a cylindrical structure made of soft magnetic material and is disposed between the magnetic isolation ring 204 and the coil mounting cylinder 205. The piston core 208 is a skeleton support structure of the piston assembly.

[0096] According to some optional embodiments of the present disclosure, the magnetic isolation ring 204 is a magnetic isolation copper ring to prevent the magnetic field generated by the annular permanent magnet 203 from entering the piston core 208 , resulting in an increase in the magnetic field intensity in the inner ring space 2031 .

[0097] According to some embodiments of the present disclosure, the impact-resistant magnetorheological damper also includes a floating piston 4, which is slidably disposed inside the cylinder body 1, and the floating piston 4 and the piston rod 3 are respectively disposed on both sides of the piston assembly 2, wherein the floating piston 4 separates an energy storage space at the second end of the cylinder body, and the energy storage space is suitable for filling with compressed gas of preset strength.

[0098] According to some optional embodiments of the present disclosure, the energy storage space is filled with high-pressure inert gas to provide initial pressure for the system, wherein when the magnetorheological damper is pressurized, the piston rod 3 enters the cylinder body, and the floating piston 4 compresses the inert gas; when the magnetorheological damper is pulled, the piston rod 3 extends out of the cylinder body 1, and the floating piston 4 is reset under the action of the compressed gas.

[0099] According to some optional embodiments of the present disclosure, O-rings for sealing are installed on the upper and lower sides of the floating piston 4, and a guide belt for contact friction is installed between the two O-rings (not shown in the figure).

[0100] According to some optional embodiments of the present disclosure, the floating piston 4 cooperates with the energy storage space to compensate for the damper, and is used to compensate for the increase or decrease in volume of the piston rod 3 in the cylinder 1. When the piston rod 3 enters and exits the cylinder 1 of the magnetorheological damper, the volume in the cylinder 1 will change, and the accumulator can compensate for the increase or decrease in volume caused by the piston rod 3 entering and exiting the cylinder 1, thereby effectively ensuring that the piston rod 3 can move normally.

[0101] Specifically, when the magnetorheological damper is in the compression process, the piston rod 3 gradually enters the cylinder 1, and the volume of the piston rod 3 that enters reduces the volume in the cylinder 1, and the pressure in the lower space increases. At this time, the floating piston 4 moves downward. The volume of the energy storage space that is reduced is the volume of the piston rod 3 that enters the cylinder 1. When the magnetorheological damper is in the tensile recovery process, that is, the piston rod 3 is extended, as the piston rod 3 is pulled out, the volume in the cylinder 1 increases, the pressure in the upper space decreases, and the floating piston 4 is reset under the thrust of the high-pressure gas in the energy storage space.

[0102] According to some embodiments of the present disclosure, the upper end surface of the piston cylinder 207 and the bottom surface of the piston upper end cover 201 are respectively provided with a first boss and a first positioning groove (not shown in the figure) for positioning. The lower end surface of the piston cylinder 207 and the top surface of the piston lower end cover 202 are respectively provided with a second boss and a second positioning groove for positioning.

[0103] According to some embodiments of the present disclosure, the cylinder 1 includes a cylinder body 101, an upper end cover 102 and a lower end cover 103. The upper end cover 102 is sealingly disposed at one end of the cylinder body 101, and a third through hole is disposed at the center of the upper end cover 102. The lower end cover 103 is sealingly disposed at the other end of the cylinder body 101. The anti-shock magnetorheological damper also includes a guide ring 5, which is embedded in the third through hole and is slidably and sealingly connected to the piston rod 3.

[0104] According to some embodiments of the present disclosure, threaded holes are evenly distributed on the side surfaces of the upper and lower ends of the cylinder body 101, and the cylinder body 101 is connected and fixed to the upper end cover 102 and the lower end cover 103 by screws.

[0105] According to some embodiments of the present disclosure, the guide ring 5 is used to reduce the friction between the piston cylinder, the piston rod and the cylinder wall, ensure the guiding ability, and reduce the lateral force.

[0106] According to some embodiments of the present disclosure, a stepped groove is provided on the guide ring 5, and the impact-resistant magnetorheological damper also includes a skeleton oil seal 6, which is sealingly embedded in the stepped groove and is suitable for sealing the magnetorheological fluid in the cylinder body.

[0107] According to some optional embodiments of the present disclosure, a groove is provided on the inner side wall of the stepped groove, and an O-ring is installed in the groove to cooperate with the skeleton oil seal 6 to seal the magnetorheological fluid.

[0108] According to some embodiments of the present disclosure, a wire hole for passing a wire is provided on the piston upper end cover 201. The piston rod 3 is a hollow structure, the piston rod 3 is connected to the wire hole, and a fourth through hole is provided on the side of the piston rod 3. The anti-shock magnetorheological damper also includes a wire, one end of which is electrically connected to the excitation coil 206, and the other end passes through the wire hole, the piston rod 3 and the fourth through hole in sequence, so as to be connected to an external power source.

[0109] According to some optional embodiments of the present disclosure, the wire is led out from the hollow piston rod 3, and a pin hole is provided on the piston rod 3 to prevent the wire from being worn.

[0110] According to some embodiments of the present disclosure, the impact-resistant magnetorheological damper also includes a graphite gasket, which is sleeved on the piston rod 3. The graphite gasket 3 is arranged between the piston upper end cover and the first end, and the graphite gasket is suitable for buffering the collision between the piston upper end cover 201 and the first end.

[0111] Figure 6 is a perspective view of a piston assembly of an anti-shock magnetorheological damper according to an exemplary embodiment of the present disclosure.

[0112] According to some embodiments of the present disclosure, Figure 6 As shown, the piston assembly also includes a protrusion 209, which extends outward from the piston upper end cover 201 along the axial direction of the piston upper end cover 201, the interior of the protrusion is hollow and connected to the first through hole 2011, and a fifth through hole 2091 for the inflow / outflow of magnetorheological fluid is opened on the side of the protrusion.

[0113] So far, the embodiments of the present disclosure have been described in detail in conjunction with the accompanying drawings. It should be noted that the implementation methods not shown or described in the drawings or the body of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each component are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and ordinary technicians in the field can simply change or replace them.

[0114] It should also be noted that, in the specific embodiments of the present disclosure, unless otherwise indicated, the numerical parameters in the present specification and the appended claims are approximate values ​​and can be changed according to the desired characteristics obtained through the content of the present disclosure. Specifically, all numbers used in the specification and claims to express the size, range conditions, etc. of the composition should be understood to be modified by the term "about" in all cases. In general, the meaning of the expression refers to the change of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments by a specific number.

[0115] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0116] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present disclosure in detail. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. An anti-shock magnetorheological damper, characterized in that: include: A cylinder body, the interior of which is suitable for containing magnetorheological fluid; A piston assembly is slidably disposed in the cylinder body, and the piston assembly divides the space in the cylinder body into an upper space and a lower space. The piston assembly includes: The piston upper end cover has a first through hole at the center; The piston lower end cover has a second through hole at the center; An annular permanent magnet is sandwiched between the piston upper end cover and the piston lower end cover, and the inner annular space of the annular permanent magnet is coaxially arranged with the first through hole and the second through hole; A magnetic isolation ring, sleeved on the outer side of the annular permanent magnet; A coil mounting cylinder is arranged outside the magnetic isolation ring; an excitation coil, wound on the coil mounting cylinder; A piston cylinder body is sleeved on the outside of the coil mounting cylinder, the piston cylinder body is sealed and connected to the piston upper end cover and the piston lower end cover respectively, there is a gap between the inner side wall of the piston cylinder body and the excitation coil, and radial channels communicating with the first through hole and the second through hole are respectively arranged at the upper and lower ends of the gap in the radial direction; The inner annular space, the first through hole and the second through hole are configured as a first channel, the gap, the radial channel, the first through hole and the second through hole are configured as a second channel, in response to the movement speed of the piston assembly being lower than a preset threshold, the magnetorheological fluid flows only through the second channel, and in response to the movement speed of the piston assembly being greater than or equal to a preset threshold, the magnetorheological fluid flows through the first channel and the second channel at the same time.

2. The impact-resistant magnetorheological damper according to claim 1, characterized in that: Also includes: One end of the piston rod can slide and seal through the first end of the cylinder body and then be connected to the piston upper end cover.

3. The impact-resistant magnetorheological damper according to claim 1, characterized in that: The piston assembly also includes: The piston core is a cylindrical structure made of soft magnetic material, and the piston core is arranged between the magnetic isolation ring and the coil installation cylinder.

4. The impact-resistant magnetorheological damper according to claim 2, characterized in that: Also includes: A floating piston is slidably disposed inside the cylinder body, wherein the floating piston and the piston rod are respectively disposed on both sides of the piston assembly, wherein the floating piston separates an energy storage space at the second end of the cylinder body, and the energy storage space is suitable for filling with compressed gas of a preset strength.

5. The impact-resistant magnetorheological damper according to claim 2, characterized in that: The upper end surface of the piston cylinder body and the bottom surface of the piston upper end cover are respectively provided with a first boss and a first positioning groove which match each other for positioning; and The lower end surface of the piston cylinder body and the top surface of the piston lower end cover are respectively provided with a second boss and a second positioning groove that match each other for positioning.

6. The impact-resistant magnetorheological damper according to claim 2, characterized in that: The cylinder body comprises: Cylinder body; An upper end cover is sealingly arranged at one end of the cylinder body, and a third through hole is arranged at the center of the upper end cover; A lower end cover is sealingly disposed at the other end of the cylinder body; The anti-shock magnetorheological damper also includes: A guide ring is embedded in the third through hole, and the guide ring is slidably and sealingly connected to the piston rod.

7. The impact-resistant magnetorheological damper according to claim 6, characterized in that: The guide ring is provided with a stepped groove, and the anti-shock magnetorheological damper further comprises: A skeleton oil seal is sealingly embedded in the stepped groove, and the skeleton oil seal is suitable for sealing the magnetorheological fluid in the cylinder body.

8. The impact-resistant magnetorheological damper according to claim 2, characterized in that: The piston upper end cover is provided with a wire hole for passing a wire; The piston rod is a hollow structure, the piston rod is connected to the wire hole, and a fourth through hole is opened on the side of the piston rod; The anti-shock magnetorheological damper also includes: A wire has one end electrically connected to the excitation coil, and the other end passes through the wire hole, the piston rod and the fourth through hole in sequence to facilitate connection with an external power source.

9. The impact-resistant magnetorheological damper according to claim 2, characterized in that: The anti-shock magnetorheological damper also includes: A graphite gasket is sleeved on the piston rod. The graphite gasket is arranged between the piston upper end cover and the first end. The graphite gasket is suitable for buffering the collision between the piston upper end cover and the first end.

10. The impact-resistant magnetorheological damper according to claim 1, characterized in that: The piston assembly also includes: The protrusion extends outward from the piston upper end cover along the axial direction of the piston upper end cover, the interior of the protrusion is hollow and connected to the first through hole, and the side of the protrusion is provided with a fifth through hole for the inflow / outflow of the magnetorheological fluid.

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