Impact-resistant self-powered magnetorheological damper

Abstract

The present disclosure provides an impact-resistant self-powered magneto-rheological damper, comprising: an inner cylinder having a receiving space for accommodating a magneto-rheological fluid; a piston slidably arranged in the receiving space, the piston being provided with a piston channel for communicating an upper space and a lower space of the piston; a piston rod having one end slidably and sealingly penetrating through a first end of the inner cylinder and connected with the piston; a piston core permanent magnet arranged in the piston, the piston core permanent magnet being adapted to generate a first magnetic field through the piston channel; an excitation coil arranged in the piston, the excitation coil being adapted to generate a second magnetic field opposite to a direction of the first magnetic field; an outer cylinder connected with the piston rod; and a power generation assembly arranged on the outer cylinder, the power generation assembly being electrically connected with the excitation coil, the power generation assembly being configured to generate an electric current in response to movement of the piston rod.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of impact and vibration control, and in particular to a shock-resistant self-powered magneto-rheological damper. BACKGROUND

[0002] Impact and vibration control is essential for today's growing high-speed machines or other dynamic systems. Road damping of vehicle suspensions, protection of armored vehicles against mine explosions, high-speed sailboats against sea wave impacts, helicopters against severe wing vibrations, etc. all require impact and vibration control systems. Safety and health problems caused by impact and vibration excitations are also getting more and more attention and emphasis. Among them, impact excitation, compared with general vibration control, has higher requirements for the performance of the damper due to the need to dissipate a large amount of impact energy in a short time. Reducing impact excitation is also a key challenge in the field of landing gear and armored vehicles against explosions.

[0003] Passive dampers have been proposed, researched and widely used in impact and vibration control. The advantages of passive dampers are low cost and simple structure; during impact, an ideal damper maintains a high damping force at the beginning of the impact with a very high speed and at the end of the impact with a lower speed, and ensures that the impact force does not exceed the maximum allowable impact load at all times. Because a larger impact load can harm passengers and mechanical structures, and a smaller impact load will reduce the rate of impact energy dissipation. However, the damping of a passive damper is fixed after manufacture, and its damping force is related to the speed, which obviously cannot meet this requirement. Specifically, once a passive damper is designed, its damping is fixed, so the energy dissipation efficiency is high at high impact speeds, but the energy dissipation efficiency decreases as the impact speed decreases. The consequence is that the overall energy dissipation efficiency of the passive damper is low, and the impact force is likely to exceed the maximum allowable impact load. In order to overcome this limitation, many advanced methods have been studied in recent years, such as active and semi-active dampers. However, due to the high power cost, expensive hardware, complex control algorithm and high instability of active dampers, the application range of active dampers is limited. For semi-active dampers, in order to fully utilize the controllable damping characteristics of the damper, sensors are also needed to measure the dynamic response, which can include the relative displacement or relative speed through the damper. These sensors require additional power supply, which increases the installation and maintenance cost of such systems and reduces the reliability. SUMMARY

[0004] To solve the above technical problems, the present disclosure provides a shock-resistant self-powered magneto-rheological damper, which can passively adjust its damping according to different impact speeds and keep the damping force within the maximum allowable impact force at a certain impact speed range, so as to maximize energy dissipation without causing damage to the mechanical structure and passengers.

[0005] According to some embodiments of the present disclosure, a shock-resistant self-powered magneto-rheological damper is provided, comprising:

[0006] an inner cylinder having a receiving space for receiving a magneto-rheological fluid;

[0007] a piston slidably arranged in the receiving space, the piston being provided with a piston channel for communicating an upper space and a lower space of the piston;

[0008] a piston rod having one end slidably and sealingly penetrating a first end of the inner cylinder and being connected with the piston;

[0009] a piston core permanent magnet arranged inside the piston, the piston core permanent magnet being adapted to generate a first magnetic field passing through the piston channel;

[0010] an excitation coil arranged inside the piston, the excitation coil being adapted to generate a second magnetic field opposite to the first magnetic field;

[0011] an outer cylinder connected with the piston rod; and

[0012] a power generation assembly arranged on the outer cylinder, the power generation assembly being electrically connected with the excitation coil, the power generation assembly being configured to generate an electric current in response to movement of the piston rod.

[0013] According to some embodiments of the present disclosure, the power generation assembly comprises:

[0014] a coil mounting cylinder;

[0015] a power generation coil sleeved on the coil mounting cylinder, wherein the coil mounting cylinder and the power generation coil are integrally nested inside the outer cylinder; and

[0016] an annular permanent magnet sleeved outside the inner cylinder;

[0017] wherein, in response to movement of the piston, the power generation coil moves relative to the annular permanent magnet to generate an electric current in the excitation coil.

[0018] According to some embodiments of the present disclosure, the number of the power generation coils is multiple, and the multiple power generation coils are arranged side by side along an axial direction of the coil mounting cylinder.

[0019] According to some embodiments of the present disclosure, the number of the annular permanent magnets is multiple, and magnetic poles of two adjacent annular permanent magnets are arranged oppositely, and the power generation assembly further comprises multiple annular magnetic poles arranged between the two adjacent annular permanent magnets.

[0020] According to some embodiments of the present disclosure, the power generation assembly further comprises:

[0021] a magnetically conductive cylinder, sleeved on the outer sidewall of the inner cylinder; and

[0022] a magnetically isolated cylinder, sleeved on the outer sidewall of the magnetically conductive cylinder;

[0023] wherein the annular permanent magnet is sleeved on the magnetically isolated cylinder, and the magnetically isolated cylinder and the magnetically conductive cylinder cooperate to eliminate the influence of the magnetic field generated by the annular permanent magnet on the magnetorheological fluid in the piston channel.

[0024] According to some embodiments of the present disclosure, the magnetorheological damper further comprises:

[0025] a spring, one end of which is connected to the second end of the inner cylinder opposite to the first end; and

[0026] a floating piston, slidably arranged in the accommodation space, the other end of the spring being connected to the floating piston;

[0027] wherein the floating piston and the spring are adapted to compensate for the volume of the accommodation space when the piston rod moves in and out of the accommodation space.

[0028] According to some embodiments of the present disclosure, the spring is a pre-tightening spring, so as to increase the initial pressure of the magnetorheological fluid in the accommodation space.

[0029] According to some embodiments of the present disclosure, the piston comprises:

[0030] a first fixing member and a second fixing member, which are arranged in the accommodation space along the axial direction of the inner cylinder, the first fixing member and the second fixing member being provided with through holes opened along the axial direction, the first fixing member being connected to the piston rod;

[0031] a piston outer cylinder, arranged between the first fixing member and the second fixing member;

[0032] a first piston core and a second piston core, arranged between the first fixing member and the second fixing member along the axial direction of the inner cylinder, wherein the piston core permanent magnet is arranged between the first piston core and the second piston core, the excitation coil being sleeved on the outer side of the first piston core and the second piston core, the first piston core being connected to the first fixing member;

[0033] a coil sealing ring, sleeved on the outer side of the excitation coil, the coil sealing ring and the piston outer cylinder having a gap therebetween; and

[0034] screws, adapted to connect the first fixing member, the second fixing member, the first piston core, the second piston core, the piston core permanent magnet and the piston outer cylinder;

[0035] The gap and the through hole constitute the piston channel.

[0036] According to some embodiments of the present disclosure, the first end of the inner cylinder is provided with a guide, which is used for sealing the first end of the inner cylinder, and the guide is provided with a guide hole opened in the axial direction, which is in a slidable sealing fit with the piston rod.

[0037] According to some embodiments of the present disclosure, the other end of the piston rod is adapted to be connected with a fixed structure, and the magneto-rheological damper further comprises:

[0038] A lifting lug is arranged on the outer sidewall of the second end of the inner cylinder opposite to the first end, and the lifting lug is adapted to be connected with a load.

[0039] The anti-impact self-powered magneto-rheological damper provided by the embodiments of the present disclosure has the following advantages and positive effects:

[0040] (1) The damper can be passively adjusted according to different impact speeds, and the damping force is kept within the maximum allowable impact force in a certain impact speed range, based on which the energy dissipation can be maximized without damaging the mechanical structure and the occupant;

[0041] (2) The power generation module has a speed sensing function, and does not need an additional speed sensor, so that the structure is simpler and the system is more reliable;

[0042] (3) The vibration energy is converted into electric energy by the power generation module, and the excitation coil is powered, so that an external power supply is not needed, the system is more energy-saving and environmentally friendly, and the reliability of the system is improved;

[0043] (4) The initial magnetic field generated by the piston core permanent magnet at the piston channel ensures that the damper has a large enough damping coefficient, and ensures that the energy dissipation efficiency remains at a high level;

[0044] (5) Since a control loop is not needed, the time delay of the control loop is eliminated, and an immediate response to the impact can be made;

[0045] (6) The up-down movement of the power generation coil relative to the annular permanent magnet is driven by the movement of the lifting lug, the power generation module and the damper module share the central space, and the structure of the damper is more compact;

[0046] (7) The piston outer cylinder and the piston core are fixed by the piston outer cylinder upper and lower fixing pieces made of magnetic isolation material, and the piston channel is formed therebetween, which effectively avoids the problem of magnetic leakage of the piston channel, and makes the effective magnetic field strength of the piston channel higher. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1This is a schematic diagram of the structure of a shock-resistant, self-powered magnetorheological damper according to exemplary embodiments of the present disclosure; and

[0048] Figure 2 yes Figure 1 A magnified schematic diagram of a local structure.

[0049] The meanings of the reference numerals in the above figures are as follows:

[0050] 1-Inner cylinder;

[0051] 2-Piston;

[0052] 201 - Piston passage;

[0053] 202-First fastener;

[0054] 203 - Second fastener;

[0055] 204 - Piston outer cylinder;

[0056] 205 - First piston core;

[0057] 206 - Second piston core;

[0058] 207 - Coil sealing ring;

[0059] 208-Screw;

[0060] 209 - Guide;

[0061] 3-Piston rod;

[0062] 4-Piston core permanent magnet;

[0063] 5 - Excitation coil;

[0064] 6-Outer cylinder;

[0065] 7-Power generation components;

[0066] 701 - Coil mounting sleeve;

[0067] 702 - Generating coil;

[0068] 703 - Ring-shaped permanent magnet;

[0069] 704 - Ring magnetic pole;

[0070] 705 - Magnetic Conductor Cylinder;

[0071] 706 - Magnetic shielding cylinder;

[0072] 8-Spring;

[0073] 9-Floating piston;

[0074] 10-Hanging lugs;

[0075] 11 - wire;

[0076] 12 - structural member; and

[0077] 13 - vibration isolator. DETAILED DESCRIPTION

[0078] For the purpose of clarity, technical and scientific terms used in the present disclosure may be similarly described. However, the description is merely to explain embodiments of the present disclosure, not to limit the scope of the present disclosure. Accordingly, the terminology used herein should be interpreted in context of the present disclosure.

[0079] It is to be understood that the foregoing description is merely exemplary of the various embodiments of the present disclosure, and that the scope of the present disclosure is not to be limited to the specific embodiments disclosed. In the following detailed description of embodiments of the application, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without these specific details. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily complicating the present disclosure.

[0080] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "includes" indicates the presence of the features, steps, operations, and the like but does not exclude the presence or addition of one or more other features.

[0081] In the event that a similar expression such as "at least one of A, B, and C, among others" is used herein, it is generally intended that the expression is used to describe each and every combination of A, B, and C, among others. For example, if the expression "at least one of A, B, and C, among others" is used herein, it is intended that the expression is used to describe the individual members of the group A, B, and C, among others, as well as the groups of at least one of A, at least one of B, at least one of C, at least one of A-B, at least one of A-C, at least one of B-C, and at least one of A-B-C, among others. In the event that a similar expression such as "at least one of A or B" is used herein, it is generally intended that the expression is used to describe the individual members of the group A, B, and at least one of A or B, and is not limited to the individual members of the group A or to the individual members of the group B.

[0082] All terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art, unless otherwise defined herein. It should be noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of the present description, and not be interpreted in an idealized or overly formal way.

[0083] Figure 1 is a structural diagram of an impact-resistant self-powered magnetorheological damper according to an exemplary embodiment of the present disclosure; Figure 2 is Figure 1A local structure of the magnetorheological damper.

[0084] According to some embodiments of the present disclosure, a magnetorheological damper is provided, which is self-powered and impact-resistant, and comprises an inner cylinder, a piston, a piston rod, a piston core permanent magnet, an excitation coil, an outer cylinder and a power generation assembly. Figure 1 and Figure 2 The structure of the magnetorheological damper comprises an inner cylinder 1, a piston 2, a piston rod 3, a piston core permanent magnet 4, an excitation coil 5, an outer cylinder 6 and a power generation assembly 7.

[0085] According to some embodiments of the present disclosure, the inner cylinder 1 has a receiving space for accommodating magnetorheological fluid.

[0086] According to some embodiments of the present disclosure, the piston 2 is slidably arranged in the receiving space, and the piston 2 is provided with a piston channel 201 for communicating an upper space and a lower space of the piston 2.

[0087] According to some embodiments of the present disclosure, one end of the piston rod 3 is slidably and sealingly connected to the piston 3 after passing through a first end of the inner cylinder 1.

[0088] According to some embodiments of the present disclosure, the piston core permanent magnet 4 is arranged inside the piston 2, and the piston core permanent magnet 4 is adapted to generate a first magnetic field passing through the piston channel.

[0089] According to some embodiments of the present disclosure, the excitation coil 5 is arranged in the piston 2, and the excitation coil 5 is adapted to generate a second magnetic field opposite to the first magnetic field.

[0090] According to some embodiments of the present disclosure, the outer cylinder 6 is connected to the piston rod 3.

[0091] According to some embodiments of the present disclosure, the power generation assembly 7 is arranged on the outer cylinder 6, the power generation assembly 7 is electrically connected to the excitation coil 5, and the power generation assembly 7 is configured to generate an electric current in response to the movement of the piston rod 3.

[0092] In the present embodiment, the magnetorheological damper passively adjusts its damping according to different impact speeds without the need for a control loop. When the impact speed is high, the current generated by the power generation assembly is large, the reverse magnetic field generated by the excitation coil 5 is strong, and the magnetic field after superposition of the magnetic field of the piston core permanent magnet 4 is weak, thereby causing the viscosity of the magnetorheological fluid to be greater as the speed of the piston rod 3 is greater, the magnetic field of the piston channel 201 is weaker, and the damping is smaller. Considering the damping and viscosity comprehensively, the total output damping force of the damper remains relatively stable, close to the maximum allowable impact force within a certain impact speed range, based on which the energy dissipation can be maximized without causing damage to the mechanical structure and the occupant.

[0093] According to some embodiments of the present disclosure, the inner cylinder 1 is an internally hollow and two-end closed cylindrical structure, the inner cylinder 1 is filled with magneto-rheological fluid, and the piston 2 is slidably arranged in the inner cylinder 1, the side surface of the piston 2 is in sliding sealing connection with the inner side wall of the inner cylinder 1, and the piston 2 divides the accommodation space in the inner cylinder 1 into an upper space and a lower space (in the direction of the upper and lower directions defined by the state of the damper). Figure 1 The piston 2 is provided with a piston channel 201 communicating the upper space and the lower space, when the piston rod 3 drives the piston 2 to move from the upper to the lower in the inner cylinder 1, the magneto-rheological fluid in the lower space flows into the upper space through the piston channel 201, and vice versa.

[0094] According to some embodiments of the present disclosure, the first magnetic field (initial magnetic field) of the piston core permanent magnet 4 arranged inside the piston 2 penetrates through the piston channel 201, so that the magneto-rheological fluid flowing through the piston channel 201 becomes semi-solid, the viscosity of the magneto-rheological fluid in this area is improved, and the damping force is formed by overcoming the shear force and viscous force. The initial magnetic field generated by the piston core permanent magnet 4 at the piston channel 201 ensures that the damper has a large enough damping coefficient, and ensures that the energy dissipation efficiency remains at a high level.

[0095] In the present embodiment, the second magnetic field generated by the excitation coil 5 arranged inside the piston 2 penetrates through the piston channel 201, the direction of the second magnetic field is opposite to that of the first magnetic field, and the second magnetic field is used to offset the strength of the initial magnetic field (first magnetic field) to reduce the viscosity of the magneto-rheological fluid in the piston channel 201. The current flowing in the excitation coil 5 is provided by the power generation assembly 7, the power generation assembly 7 is electrically connected to the excitation coil 5 through the wire 11, the power generation assembly 7 generates an induced current in response to the movement of the piston rod 3 (driving the outer cylinder 6) and inputs the induced current into the excitation coil 5 to generate the second magnetic field, the size of the induced current is related to the moving speed of the piston rod 3, the greater the moving speed of the piston rod 3, the greater the induced current generated, and the greater the strength of the second magnetic field generated correspondingly, so as to offset more first magnetic field, and the higher the viscosity of the magneto-rheological fluid in the piston channel 201.

[0096] According to some embodiments of the present disclosure, the power generation assembly comprises a coil mounting cylinder 701, a power generation coil 702 and an annular permanent magnet 703.

[0097] According to some embodiments of the present disclosure, the power generation coil 702 is sleeved outside the coil mounting cylinder 701, and the coil mounting cylinder 701 and the coil mounting cylinder 701 are integrally nested on the inside of the outer cylinder 6. The coil mounting cylinder 701 (integrally with the power generation coil 702) and the outer cylinder 6 are connected in interference fit. The power generation coil 702 is electrically connected to the excitation coil 5.

[0098] According to some embodiments of the present disclosure, the annular permanent magnet 703 is sleeved on the outer side of the inner cylinder 1.

[0099] In the present embodiment, in response to the movement of the piston 2, the power generation coil 702 moves relative to the annular permanent magnet 703 to generate an induced current in the excitation coil 5.

[0100] According to some embodiments of the present disclosure, the number of power generation coils 702 is multiple, and the multiple power generation coils 702 are arranged side by side along the axial direction of the coil mounting cylinder 701.

[0101] According to some embodiments of the present disclosure, the number of annular permanent magnets 703 is multiple, and the magnetic poles of two adjacent annular permanent magnets 703 are arranged oppositely. The power generation assembly further comprises multiple annular magnetic poles 704, each of which is arranged between two adjacent annular permanent magnets 703. The annular magnetic pole 704 is suitable for conducting the magnetic field of the two adjacent annular permanent magnets 703, and the annular magnetic pole 704 is made of a magnetic conductive material.

[0102] In the present embodiment, the power generation assembly 7 has the functions of speed sensing and power generation, replaces the traditional sensor and power supply module, simplifies the structure, makes the system more reliable, and has the characteristics of energy saving and environmental protection. The current generated by the power generation assembly 7 is used to weaken the initial magnetic field of the piston channel, and the initial magnetic field is generated by the piston core permanent magnet; no control loop is needed, the time delay of the control loop is eliminated, and a quick response to the impact can be made.

[0103] According to some embodiments of the present disclosure, the power generation assembly further comprises a magnetic conductive cylinder 705 and a magnetic isolation cylinder 706.

[0104] According to some embodiments of the present disclosure, the magnetic conductive cylinder 705 is sleeved on the outer side wall of the inner cylinder; and the magnetic isolation cylinder 706 is sleeved on the outer side wall of the magnetic conductive cylinder 705.

[0105] In the present embodiment, the magnetic isolation cylinder 706 is arranged adjacent to the annular permanent magnet 703 to isolate the influence of the magnetic field of the annular permanent magnet 703 on the magnetorheological fluid in the inner cylinder 1. Further, the magnetic conductive cylinder 705 arranged on the inner side of the magnetic isolation cylinder 706 can strengthen the isolation effect. The magnetic conductive cylinder 705 can confine the magnetic field not isolated by the magnetic isolation cylinder 706 inside the magnetic conductive cylinder 705, so as to prevent the influence of the magnetic field of the annular permanent magnet 703 on the magnetorheological fluid in the inner cylinder 1.

[0106] According to some optional embodiments of the present disclosure, the magnetic isolation cylinder 706 is assembled into a cylindrical structure by two semicircular arc-shaped plates, so as to facilitate the installation.

[0107] According to some embodiments of the present disclosure, the magnetorheological damper further comprises a spring 8 and a floating piston 9.

[0108] According to some embodiments of the present disclosure, one end of the spring 8 is connected to a second end of the inner cylinder 1 opposite to the first end; the floating piston 9 is slidably arranged in the accommodation space, and the other end of the spring 8 is connected to the floating piston 9; wherein the floating piston 9 and the spring 8 are adapted to compensate the volume of the piston rod 3 moving in and out of the accommodation space.

[0109] According to some embodiments of the present disclosure, the spring 8 is a pre-tightening spring, so as to increase the initial pressure of the MR fluid in the accommodation space.

[0110] In the present embodiment, the floating piston 9 and the spring 8 constitute an energy storage structure, which is pre-tightened during installation to increase the initial pressure of the MR fluid in the inner cylinder 1. When the damper is compressed, the MR fluid flows to the upper cavity through the piston passage 201; when the damper is stretched, the MR fluid flows to the lower cavity through the piston passage 201. The MR fluid becomes semi-solid in the piston passage 201 under the action of the magnetic field, and flows against the shear force and viscous force, thereby forming a damping force. The spring 8 energy storage structure is used to compensate the volume of the piston rod 3 during stretching and compression.

[0111] According to some embodiments of the present disclosure, the space between the floating piston 9 and the second end of the inner cylinder 1, i.e. the space where the spring 8 is located, is free of MR fluid, so as to facilitate the compression movement of the floating piston 9.

[0112] According to some embodiments of the present disclosure, the piston 2 comprises a first fixing member 202, a second fixing member 203, a piston outer cylinder 204, a first piston core 205, a second piston core 206, a coil sealing ring 207 and a screw 208.

[0113] According to some embodiments of the present disclosure, the first fixing member 202 and the second fixing member 203 are arranged in the accommodation space in the axial direction of the inner cylinder 1, and the first fixing member 202 and the second fixing member 203 are provided with through holes opened in the axial direction, and the first fixing member 202 is connected to the piston rod 3. The piston outer cylinder 204 is arranged between the first fixing member 202 and the second fixing member 203. The first piston core 205 and the second piston core 206 are arranged between the first fixing member 202 and the second fixing member 203 in the axial direction of the inner cylinder 1, wherein the piston core permanent magnet 4 is arranged between the first piston core 205 and the second piston core 206, the excitation coil 5 is sleeved outside the first piston core 205 and the second piston core 206, and the first piston core 205 is connected to the first fixing member 202. The coil sealing ring 207 is sleeved outside the excitation coil 5, and the coil sealing ring 207 has a gap with the piston outer cylinder 204, wherein the gap and the through hole constitute the piston passage. The screw 208 is adapted to connect the second fixing member 203, the first piston core 205, the second piston core 206, the piston core permanent magnet 4 and the piston outer cylinder 204 into one body.

[0114] According to some optional embodiments of the present disclosure, the piston rod 3 and the first piston core 205 are connected through threads.

[0115] According to some optional embodiments of the present disclosure, the screw 208 is made of aluminum alloy to prevent magnetic leakage from weakening the magnetic field strength in the piston channel 201.

[0116] According to some optional embodiments of the present disclosure, the first fixing member 202, the second fixing member 203, the first piston core 205, the second piston core 206 and the piston outer cylinder 204 are all made of magnetic isolation material and are configured into the piston channel 201 through the through hole and the gap, effectively avoiding the problem of magnetic leakage of the piston channel 201 and making the effective magnetic field strength of the piston channel 201 higher.

[0117] According to some embodiments of the present disclosure, the first end of the inner cylinder 1 is provided with a guide 209 for sealing the first end of the inner cylinder 1, and the guide 209 is provided with a guide hole opened in the axial direction, which is in slidable sealing fit connection with the piston rod 3.

[0118] According to some alternative embodiments of the present disclosure, the guide hole of the guide 209 is provided with a shock absorbing block 13 to reduce the influence of external vibration on the inner cylinder 1.

[0119] According to some embodiments of the present disclosure, the other end of the piston rod 3 is adapted to be connected with a fixed structure, and the magnetorheological damper further comprises a lifting lug 10 arranged on the outer side wall of the second end of the inner cylinder 1 opposite to the first end, and the lifting lug 10 is adapted to be connected with a load.

[0120] In the present embodiment, the movement of the lifting lug 10 drives the up and down movement of the power generation coil 702 relative to the annular permanent magnet 703, and the power generation assembly 7 and the damper module share the central space, making the structure of the damper more compact.

[0121] According to some alternative embodiments of the present disclosure, the other end of the piston rod 3 is connected with a load, and the second end of the inner cylinder 1 opposite to the first end is connected with a fixed structure.

[0122] According to some embodiments of the present disclosure, the outer side wall of the second end of the inner cylinder 1 is provided with a structural member 12 adapted to fix and position the magnetic isolation cylinder, the magnetic conduction cylinder, the annular permanent magnet and the annular magnetic pole.

[0123] Thus far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that the implementation manners not shown or described in the accompanying drawings or the specification are known to those skilled in the art, and are not described in detail. In addition, the definitions of the above components are not limited to the specific structures, shapes or manners mentioned in the embodiments, and can be simply changed or replaced by those skilled in the art.

[0124] It should also be noted that in the specific embodiments of the present disclosure, unless otherwise known as the opposite meaning, the numerical parameters in the specification and the appended claims are approximate values, which can be changed according to the required characteristics obtained by the content of the present disclosure. Specifically, all the numbers used in the specification and the claims to express the size, range condition and the like of the composition should be understood as being modified by the term "about" in all cases. Generally, the meaning expressed therein refers to the variation of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, ±0.5% in some embodiments from the specific number.

[0125] Those skilled in the art can understand that the features described in various embodiments and / or claims of the present disclosure can be combined or / and integrated, even if such combination or integration is not explicitly described in the present disclosure. In particular, the features described in various embodiments and / or claims of the present disclosure can be combined and / or integrated in various combinations, without departing from the spirit and teachings of the present disclosure. All these combinations and / or integrations fall within the scope of the present disclosure.

[0126] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only for specific embodiments of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A shock-resistant self-powered magneto-rheological damper, characterized in that, The magnetorheological damper comprises: an inner cylinder having a receiving space for accommodating magnetorheological fluid; a piston slidably arranged in the receiving space, the piston being provided with a piston channel for connecting an upper space and a lower space of the piston; a piston rod having one end slidably and sealingly penetrating through a first end of the inner cylinder and being connected with the piston; a piston core permanent magnet arranged inside the piston, the piston core permanent magnet being adapted to generate a first magnetic field through the piston channel; an excitation coil arranged inside the piston, the excitation coil being adapted to generate a second magnetic field opposite to the first magnetic field; an outer cylinder connected with the piston rod; and a power generation assembly arranged on the outer cylinder, the power generation assembly being electrically connected with the excitation coil, the power generation assembly being configured to generate electric current in response to movement of the piston rod. The power generation assembly comprises: a coil mounting cylinder; a power generation coil sleeved on the coil mounting cylinder, wherein the coil mounting cylinder and the power generation coil are integrally nested on the inner side of the outer cylinder; and an annular permanent magnet sleeved on the outer side of the inner cylinder; wherein, in response to movement of the piston, the power generation coil moves relative to the annular permanent magnet to generate electric current in the excitation coil. a magnetic conducting cylinder sleeved on the outer wall of the inner cylinder; and a magnetic shielding cylinder sleeved on the outer wall of the magnetic conducting cylinder; wherein the annular permanent magnet is sleeved on the magnetic shielding cylinder, and the magnetic shielding cylinder and the magnetic conducting cylinder cooperate to eliminate the influence of the magnetic field generated by the annular permanent magnet on the magnetorheological fluid in the piston channel. The number of the power generation coils is multiple, and the multiple power generation coils are arranged side by side along the axial direction of the coil mounting cylinder.

2. The magnetorheological damper of claim 1, wherein, The number of the annular permanent magnets is multiple, and the magnetic poles of two adjacent annular permanent magnets are arranged oppositely, and the power generation assembly further comprises multiple annular magnetic poles arranged between two adjacent annular permanent magnets.

3. The magnetorheological damper of claim 1, wherein, The magnetorheological damper further comprises:

4. The magnetorheological damper of claim 1, wherein, a spring having one end connected with a second end of the inner cylinder opposite to the first end; and a floating piston slidably arranged in the receiving space, the floating piston being connected with the other end of the spring; wherein the floating piston and the spring are adapted to compensate the volume of the receiving space when the piston rod moves in and out of the receiving space. The spring is a pre-tightening spring, so as to increase the initial pressure of the magnetorheological fluid in the receiving space.

5. The magnetorheological damper of claim 4, wherein, The piston comprises:

6. The magnetorheological damper of claim 1, wherein, a first fixing member and a second fixing member arranged in the receiving space in the axial direction of the inner cylinder, the first fixing member and the second fixing member being provided with through holes opened in the axial direction, and the first fixing member being connected with the piston rod; a piston outer cylinder arranged between the first fixing member and the second fixing member; a first piston core and a second piston core arranged between the first fixing member and the second fixing member in the axial direction of the inner cylinder, wherein the piston core permanent magnet is arranged between the first piston core and the second piston core, the excitation coil is sleeved on the outer side of the first piston core and the second piston core, and the first piston core is connected with the first fixing member. ​ A coil sealing ring is sleeved outside the excitation coil, and a gap is formed between the coil sealing ring and the outer cylinder of the piston. Screws are used to connect the first fixing member, the second fixing member, the first piston core, the second piston core, the piston core permanent magnet and the outer cylinder of the piston into one body. The gap and the through hole constitute the piston channel.

7. The magnetorheological damper of claim 1, wherein, The first end of the inner cylinder is provided with a guide, which is used to seal the first end of the inner cylinder, and the guide is provided with a guide hole opened in the axial direction, which is in slidable sealing fit connection with the piston rod.

8. The magnetorheological damper of claim 1, wherein, The other end of the piston rod is suitable for being connected with a fixed structure, and the magnetorheological damper further comprises: A lifting lug is arranged on the outer sidewall of the second end of the inner cylinder opposite to the first end, and the lifting lug is suitable for connecting a load.

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