Double-cylinder magnetorheological damper with simple structure and large stroke

Abstract

The utility model belongs to the technical field of automobile suspensions, and particularly discloses a double-cylinder magnetorheological damper which is simple in structure and large in stroke and comprises an inner cylinder, an outer cylinder, a piston body, a piston rod and a floating piston. A first accommodating space is formed in the inner cylinder and is used for accommodating magnetorheological fluid; the outer cylinder is arranged outside the inner cylinder in a sleeving mode, and a second containing space is formed between the outer cylinder and the inner cylinder. The utility model provides a double-cylinder magnetorheological damper which is simple in structure and large in stroke, namely, on the basis of a traditional single-cylinder magnetorheological damper, a double-cylinder structural design is introduced, and a magnetorheological fluid flow channel communicated with an inner cylinder and an outer cylinder is additionally arranged below the inner cylinder, so that the movement range of a piston body is enlarged, a larger stroke can be realized, and the service life of the piston body is prolonged. Better market prospects are realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile suspension, especially relates to a double cylinder type magneto rheological damper with simple structure and large stroke. BACKGROUND

[0002] With the rapid development of modern industrial technology, the demand for vibration control technology is more and more prominent, especially in the fields of automobile industry, building anti-seismic, aerospace and medical rehabilitation, accurate and efficient vibration control technology becomes a key problem. Although the traditional passive damper has simple structure and low cost, it is difficult to adapt to complex and changeable working environment due to its fixed damping characteristics. And the semi-active and active damper can significantly improve the vibration control effect by intelligently adjusting the damping force, and has become a hot research direction in recent years.

[0003] As a typical intelligent damping device, the magneto rheological damper takes magneto rheological fluid as the core material, combines with the control algorithm, and realizes the real-time controllable damping force by adjusting the external magnetic field. The magneto rheological fluid has a unique magneto rheological effect: under the action of the external magnetic field, the viscosity and yield stress will increase significantly, so as to change the mechanical properties of the damper, and when the external magnetic field is removed, the viscosity and yield stress will return to the original state, and this change can be completed within a few milliseconds. This characteristic makes the magneto rheological damper have the advantages of fast response speed, low energy consumption and high reliability, and has a wide application prospect in the fields of automobile suspension system, building isolation system and precision machinery. However, the stroke of the single cylinder damper sometimes cannot meet the actual use requirement. UTILITY MODEL CONTENTS

[0004] The utility model discloses a double cylinder type magneto rheological damper with simple structure and large stroke, that is, on the basis of the traditional single cylinder type magneto rheological damper, the structure design of double cylinder is introduced, the magneto rheological liquid flow channel communicating the inner and outer cylinders is additionally arranged below the inner cylinder, the movement range of the piston body is increased, larger stroke can be realized, and better market prospect is achieved.

[0005] In order to realize the above technical purpose and achieve the above technical effect, the utility model realizes the following technical scheme:

[0006] A double cylinder type magneto rheological damper with simple structure and large stroke, comprising:

[0007] The inner cylinder has a first containing space in it, and the first containing space is used for containing magneto rheological fluid;

[0008] The outer cylinder is arranged outside the inner cylinder, and a second containing space is formed between the outer cylinder and the inner cylinder;

[0009] A piston body is arranged in the first accommodating space and separates the first accommodating space into an upper chamber and a lower chamber, an annular flow channel is arranged on the piston body, the upper chamber and the lower chamber are communicated through the annular flow channel, a magnetic fluid flow channel is arranged on the lower chamber, and the first accommodating space and the second accommodating space are communicated through the magnetic fluid flow channel;

[0010] A piston rod is arranged at one end of the piston body and at the other end of the piston rod.

[0011] An excitation coil is arranged in the piston body and is used to generate a magnetic field.

[0012] A floating piston is arranged in the second accommodating space and separates the second accommodating space into an upper chamber and a lower chamber.

[0013] Further, a piston rod guide is arranged on the outer surface of the piston rod and is arranged at the top of the outer cylinder.

[0014] Further, an oil seal pressing ring is arranged in the piston rod guide.

[0015] Further, an upper lifting lug is arranged at the end of the piston rod away from the piston body.

[0016] Further, an upper lifting lug sleeve is arranged in the upper lifting lug, and a vibration isolation sleeve is arranged on the upper lifting lug.

[0017] Further, the upper chamber is used to store high-pressure gas, and the lower chamber is used to contain magnetic fluid.

[0018] Further, a lower lifting lug is arranged at the bottom of the outer cylinder.

[0019] Further, a lower lifting lug sleeve is arranged in the lower lifting lug, and a vibration isolation sleeve is arranged on the lower lifting lug.

[0020] Further, a sealing ring is arranged on the outer surface of the floating piston.

[0021] Further, a floating piston guide is arranged on the floating piston.

[0022] Compared with the prior art, the beneficial effects of the double-cylinder type magnetic fluid damper are as follows:

[0023] 1. The double-cylinder type magnetic fluid damper has a simple structure and a large stroke, is simple in structure and low in energy consumption, the magnetic field adjustment only needs a small current to be realized due to the excitation coil used to generate a magnetic field, the overall power consumption is low, an additional driving power source is not needed, and the function can be realized only through the excitation coil (i.e. the electromagnetic coil), so that the energy consumption is greatly reduced.

[0024] 2、The magnetorheological fluid usually has a reaction time of milliseconds to the change of the magnetic field, can respond to the change of external vibration in real time, and has fast response speed, and the fast response characteristic makes the magnetorheological fluid perform excellently in dynamic vibration control, for example, processing complex road conditions or high-frequency vibration.

[0025] 3、The double-cylinder magnetorheological damper has controllable damping force, wide adjustment range, simple structure and large stroke, specifically, the damping force of the magnetorheological damper can be continuously adjusted by controlling the magnetic field strength through the current, and different working condition requirements can be adapted. The change range of the damping force from a lower value to a higher value is significantly larger than that of a traditional damper, and the requirements of comfort and controllability can be met at the same time.

[0026] 4、The magnetorheological fluid can fully flow and dissipate heat through the optimized flow channel design and double-cylinder structure, and the reliability and stability of the damper during long-time work are ensured.

[0027] 5、The double-cylinder structure makes the floating piston compensate a larger piston rod volume, the damper has a longer maximum stroke, and the damping force adjustment range is larger, so that more complex situations can be adapted. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate certain illustrative embodiments of the present application and are used to explain the present application, but do not limit the present application. In the drawings:

[0029] Figure 1 is a structural schematic view of the present application.

[0030] Among them, the reference signs are: 1, upper lifting lug; 2, piston rod; 3, outer cylinder; 4, inner cylinder; 5, floating piston; 6, inner cylinder upper chamber; 7, piston outer cylinder; 8, piston core; 9, excitation coil; 10, lower end cover of piston; 11, magnetorheological fluid flow channel; 12, lower lifting lug; 13, lower lifting lug vibration isolation sleeve; 14, lower lifting lug shaft sleeve; 15, lower chamber of inner cylinder; 17, piston brass ring; 18, piston pin; 19, upper end cover of piston; 20, gas storage cavity; 21, oil seal pressing ring; 22, piston rod guider; 23, upper lifting lug vibration isolation sleeve; 24, upper lifting lug shaft sleeve; 30, second containing space; 301, lower chamber of magnetorheological fluid; 101, piston body. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0032] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0033] As a typical intelligent damping device, the magneto-rheological damper takes magneto-rheological fluid as the core material, combines with a control algorithm, and realizes real-time controllable damping force by adjusting an external magnetic field. The magneto-rheological fluid has a unique magneto-rheological effect: under the action of an external magnetic field, the viscosity and yield stress will increase significantly, thereby changing the mechanical properties of the damper, and when the external magnetic field is removed, the viscosity and yield stress will return to the original state, and this change can be completed within a few milliseconds. This feature makes the magneto-rheological damper have the advantages of fast response speed, low energy consumption and high reliability, and has a wide application prospect in the fields of automobile suspension systems, building isolation systems and precision machinery. However, the stroke of the single-cylinder damper sometimes cannot meet the actual use requirements.

[0034] Therefore, a double-cylinder magneto-rheological damper with simple structure and large stroke is provided, which can realize larger damper stroke in limited space to meet the actual use requirements.

[0035] As shown in Figure 1 A double-cylinder magneto-rheological damper with simple structure and large stroke includes an inner cylinder 4, an outer cylinder 3, a piston body 101, a piston rod 2, an excitation coil 9 and a floating piston 5.

[0036] The inner cylinder 4 has a first accommodating space, and the first accommodating space is used for accommodating magneto-rheological fluid.

[0037] The outer cylinder 3 is sleeved on the outside of the inner cylinder 4, and the second accommodating space 30 is formed between the outer cylinder 3 and the inner cylinder 4.

[0038] The piston body 101 is slidably arranged in the first accommodating space, the piston body 101 divides the first accommodating space into an inner cylinder upper chamber 6 and an inner cylinder lower chamber 15, an annular flow channel is arranged on the piston body 101, the inner cylinder upper chamber 6 and the inner cylinder lower chamber 15 are communicated through the annular flow channel, a magnetic rheological fluid flow channel 11 is arranged on the inner cylinder lower chamber 15, and the first accommodating space and the second accommodating space 30 are communicated through the magnetic rheological fluid flow channel 11;

[0039] One end of the piston rod 2 is fixedly connected with the piston body 101, and the other end of the piston rod 2 is arranged outside the inner cylinder 4 and is sealingly connected between the inner cylinder 4 and the end of the piston rod 2 extending out of the inner cylinder 4;

[0040] The excitation coil 9 is arranged in the piston body 101 and is used for generating a magnetic field; the excitation coil 9 in the piston body 101 of the double-cylinder type magnetic rheological damper can change the magnetic field strength generated by the excitation coil 9 at the annular flow channel by changing the applied current, the magnetic rheological fluid can change its viscosity according to the strength of the magnetic field, and then the damping coefficient of the double-cylinder type magnetic rheological damper is changed; since the magnetic field adjustment only needs a small current to be realized, the overall power consumption is low, and an additional driving power source is not needed, and the function can be realized only through the electromagnetic coil, thereby greatly reducing the energy consumption;

[0041] The floating piston 5 is arranged in the second accommodating space 30, and the floating piston 5 divides the second accommodating space 30 into a gas storage cavity 20 and a magnetic rheological fluid lower cavity 301; the floating piston 5 is arranged in the second accommodating space 30, that is, the floating piston 5 is arranged between the inner cylinder 4 and the outer cylinder 3, so that the volume of the piston rod 2 that can be compensated by the floating piston 6 is larger under the same axial length, thereby making the double-cylinder type magnetic rheological damper have a larger stroke;

[0042] Since the outer cylinder 3 is arranged outside the inner cylinder 4, the second accommodating space 30 is formed between the outer cylinder 3 and the inner cylinder 4, that is, the interlayer (that is, the second accommodating space 30) between the outer cylinder 3 and the inner cylinder 4 can provide an accommodating space for the high-pressure gas in the gas storage cavity 20 and the magnetic rheological fluid in the magnetic rheological fluid lower cavity 301; in addition, since the gas storage cavity 20 is filled with high-pressure gas, the fullness and smoothness of the indicator diagram of the working chamber of the double-cylinder type magnetic rheological damper can be ensured;

[0043] The provided floating piston 5 is slidably arranged in the interlayer (that is, the second accommodating space 30) between the inner cylinder and the outer cylinder, can move up and down, compresses the high-pressure gas in the gas storage cavity 20, and is used for compensating the volume difference generated when the piston rod 2 moves;

[0044] In the utility model, the interlayer (second containing space 30) is divided into upper and lower chambers by the floating piston 5, the upper chamber is the gas storage chamber 20, is full of high pressure gas, and the lower chamber is the magnetorheological fluid lower chamber 301, is full of magnetorheological fluid.The first containing space of the double cylinder type magnetorheological damper inner tube 4 is separated into two chambers by the piston body 101, which are the upper chamber and the lower chamber, namely the inner tube upper chamber 6 and the inner tube lower chamber 15, and the upper and lower chambers are full of magnetorheological fluid.The inner tube lower chamber 15 has the magnetorheological fluid flow channel 11 connecting the inner tube 4 and the outer tube 3, and the magnetorheological fluid can reach the lower chamber (magnetorheological fluid lower chamber 301) of the interlayer (second containing space 30) through the magnetorheological fluid flow channel 11;

[0045] In the utility model, the movement of the piston rod 2 and the piston body 101 is associated with the up and down jounce movement of the vehicle, when the piston body 101 moves, the annular flow channel in the piston body 101 flows with the magnetorheological fluid, at this time, the coil is supplied with a certain current to generate a magnetic field, the viscosity of the magnetorheological fluid changes, the damper provides controllable damping force to the outside, and the excess energy of the suspension is consumed to attenuate vibration.In different magnetic fields, different sizes of damping force are provided to realize variable damping, and due to the characteristics of the magnetorheological fluid, the required damping force can be changed at a very high frequency, and various vehicle conditions can be adapted;

[0046] The double cylinder type magnetorheological damper takes the magnetorheological fluid as the core working medium, adjusts the viscosity of the magnetorheological fluid through an external magnetic field, and thus realizes accurate adjustment of the damping force.Under the action of no magnetic field, the magnetic particles in the magnetorheological fluid are randomly distributed, and the liquid shows the characteristics of a low-viscosity Newtonian fluid;When a magnetic field is applied to the magnetorheological fluid, the magnetic particles in the magnetorheological fluid rapidly arrange into a chain or network structure under the action of the magnetic field, forming a kind of "semi-solid" state with yield stress, and the formation of this structure greatly increases the viscosity of the magnetorheological fluid, thereby improving the output damping force of the damper, and when the magnetic field is removed, the magnetorheological fluid can recover to the original low-viscosity state within a few milliseconds.The strength of the magnetic field can be flexibly controlled by adjusting the current size in the coil.When the current increases, the magnetic field strength increases, the particle chain of the magnetorheological fluid is more compact, the yield stress further increases, and the damping force increases accordingly;When the current weakens, the chain structure disappears, the viscosity decreases, and the damping force decreases accordingly.This continuous adjustable characteristic enables the magnetorheological damper to quickly respond to changes in external vibration, realizing real-time control of vibration.When the vibration weakens or the external control signal is interrupted, the magnetic field disappears immediately, the magnetic particle chain in the magnetorheological fluid rapidly disintegrates, the liquid returns to a low-viscosity state, and the damper reenters the initial low-damping state;

[0047] The damping force of the magnetorheological damper can be continuously adjusted by controlling the magnetic field strength through the current, adapting to different working condition requirements.The change range of the damping force from a lower value to a higher value is significantly greater than that of a traditional damper, and can simultaneously meet the requirements of comfort and handling;

[0048] The magneto-rheological damper also has a high response speed, which is mainly due to the reaction time of the magneto-rheological fluid to the magnetic field change is usually in milliseconds, thereby being able to respond to the change of external vibration in real time; the fast response characteristic of the magneto-rheological damper makes it perform excellently in dynamic vibration control, such as processing complex road conditions or high-frequency vibration;

[0049] The double-cylinder structure of the double-cylinder magneto-rheological damper makes the floating piston 5 compensate for a larger volume of the piston rod 2, so that the maximum stroke of the double-cylinder magneto-rheological damper is longer, and the damping force adjustment range is larger, which can adapt to more complex situations.

[0050] As shown in Figure 1 In some embodiments of the utility model, a piston rod guide 22 is also sealingly installed on the outside of the piston rod 2, and the piston rod guide 22 is sealingly installed on the top of the outer cylinder 3; the piston rod guide 22 is used to seal the upper end of the outer cylinder 3;

[0051] Specifically, the piston rod guide 22 is also provided with an oil seal pressing ring 21;

[0052] The piston rod guide 22 has a guide hole opened along its axial direction, and the piston rod 2 is slidably arranged in the guide hole and sealingly connected with the guide hole.

[0053] As shown in Figure 1 In some embodiments of the utility model, an upper lifting lug 1 is arranged at the end of the piston rod 2 away from the piston body 101; the upper lifting lug 1 is mainly used for connecting a load.

[0054] As shown in Figure 1 In some embodiments of the utility model, an upper lifting lug shaft sleeve 24 is arranged in the upper lifting lug 1, and an upper lifting lug vibration isolation sleeve 23 is arranged on the upper lifting lug 1;

[0055] The upper lifting lug shaft sleeve 24 is mainly used for fixing and supporting the upper lifting lug 1, and reducing the abrasion of the upper lifting lug 1 when it is stressed;

[0056] The upper lifting lug vibration isolation sleeve 23 is used to reduce vibration and noise.

[0057] As shown in Figure 1 In some embodiments of the utility model, the gas storage cavity 20 is used for storing high-pressure gas, and the lower magneto-rheological fluid cavity 301 is used for containing magneto-rheological fluid;

[0058] Since the gas storage cavity 20 is filled with high-pressure gas, the fullness and smoothness of the indicator diagram of the working chamber of the double-cylinder magneto-rheological damper can be ensured;

[0059] The inner cylinder lower chamber 15 is provided with a magnetorheological fluid flow channel 11 connecting the inner cylinder 4 and the outer cylinder 3, and the magnetorheological fluid can reach the lower chamber (i.e., the magnetorheological fluid lower chamber 301) of the interlayer (i.e., the second accommodation space 30) through the magnetorheological fluid flow channel 11.

[0060] Therefore, by optimizing the flow channel design and the double-cylinder structure, the magnetorheological fluid can flow and dissipate heat sufficiently, thereby ensuring the reliability and stability of the double-cylinder magnetorheological damper during long-time operation.

[0061] As shown in the drawings, Figure 1 In some embodiments of the present application, the bottom of the outer cylinder 3 is provided with a lower lifting lug 12.

[0062] The lower lifting lug 12 is mainly used for connecting a load.

[0063] As shown in the drawings, Figure 1 In some embodiments of the present application, the lower lifting lug 12 is provided with a lower lifting lug shaft sleeve 14, and the lower lifting lug 12 is provided with a lower lifting lug vibration isolation sleeve 13.

[0064] The lower lifting lug vibration isolation sleeve 13 is mainly used for reducing vibration and noise, and the lower lifting lug shaft sleeve 14 is mainly used for fixing and supporting the lower lifting lug 12, while reducing the wear of the lower lifting lug 12 under stress.

[0065] As shown in the drawings, Figure 1 In some embodiments of the present application, the outer portion of the floating piston 5 is further provided with a sealing ring. Since the floating piston 5 divides the gas storage chamber 20 into a gas storage upper chamber 201 and a magnetorheological fluid lower chamber 202, the sealing ring is arranged to ensure the sealing between the gas storage upper chamber 201 and the magnetorheological fluid lower chamber 202.

[0066] As shown in the drawings, Figure 1 In some embodiments of the present application, the floating piston 5 is further provided with a floating piston guide. The floating piston guide is used to limit the position and sealing of the floating piston 5 during the up-and-down movement of the floating piston 5.

[0067] As shown in the drawings, Figure 1 In some embodiments of the present application, the piston body 101 includes a piston upper end cover 19, a piston lower end cover 10, a piston outer cylinder 7 arranged between the piston upper end cover 19 and the piston lower end cover 10, and a piston core 8 arranged in the piston outer cylinder 7. The two ends of the piston outer cylinder 7 are connected to the piston upper end cover 19 and the piston lower end cover 10, respectively. One end of the piston rod 2 located in the inner cylinder 4 is connected to the piston upper end cover 19 on the piston body 101.

[0068] Specifically, the excitation coil 9 is sleeved outside the piston core 8.

[0069] In addition, the piston body 101 further includes a piston copper ring 17 and a piston pin 18.

[0070] The double-cylinder magnetorheological damper has the advantages of simple structure, large stroke, and the like.

[0071] The inner cylinder 4 of the double-cylinder magnetorheological damper has a first accommodating space for accommodating the magnetorheological fluid; the interlayer (i.e., the second accommodating space 30) between the outer cylinder 3 and the inner cylinder 4 provides an accommodating space for the floating piston 5 and the magnetorheological fluid.

[0072] The piston body 101 divides the inner cylinder 4 of the damper into upper and lower chambers (i.e., the inner cylinder upper chamber 6 and the inner cylinder lower chamber 15); when the piston body 101 moves up and down in the inner cylinder, the piston body 101 is provided with an annular flow channel for connecting the inner cylinder upper chamber 6 and the inner cylinder lower chamber 15; the magnetorheological fluid flows in the flow channel, and then generates an adjustable damping force.

[0073] The inner cylinder lower chamber 15 is provided with a flow channel for connecting the magnetorheological fluid in the inner cylinder 4 and the outer cylinder 3.

[0074] The exciting coil 9 is arranged in the piston body 101 and is used to generate a magnetic field; by applying different current sizes, the magnetic field intensity at the annular flow channel is changed, and then the viscosity of the magnetorheological fluid and the damping coefficient of the magnetorheological damper are changed.

[0075] The piston core and the piston outer cylinder of the piston body 101 are made of magnetically conductive material No. 20 steel, so as to enhance the magnetic field intensity of the magnetorheological fluid action area.

[0076] The piston rod 2 is connected with the upper end cover of the piston body 101, and the upper hanging ear 1 and the piston rod 2 can be threadedly connected.

[0077] The piston rod guide 22 is provided with a piston rod dynamic seal and a guide bushing, and plays a role of sealing the magnetorheological fluid and guiding; the oil seal pressing ring 21 is arranged in the piston rod guide 22 and plays a role of limiting the piston position and sealing.

[0078] The floating piston 5 is provided with a sealing ring and a floating piston guide, and is used for sealing between the gas storage cavity 20 and the magnetorheological fluid lower chamber 301.

[0079] The gas storage cavity 20 provides a certain initial pressure for the magnetorheological fluid in the upper and lower chambers and is used for compensating the volume of the piston rod 2 in the process of the up and down movement of the piston body 101.

[0080] The double-cylinder magnetorheological damper has simple structure and large stroke, the movement of the piston rod 2 and the piston body 101 is associated with the up-down bumping movement of the vehicle, the chamber between the inner cylinder 4 and the piston body 101 is filled with magnetorheological fluid, the gap between the inner cylinder 4 and the outer cylinder 3 is divided into upper and lower chambers by the floating piston 5, the upper part of the floating piston 5 is filled with high-pressure gas, the lower part of the floating piston 5 is filled with magnetorheological fluid, the movement of the piston body 101 in the magnetorheological fluid can provide damping force, the strength of the magnetic field in the piston body 101 can be controlled by controlling the current passing through the excitation coil 9 in the piston body 101, and then the viscosity of the magnetorheological fluid is controlled, so that the purpose of controlling the output damping force of the damper is achieved. The interlayer (i.e. the second containing space 30) between the magnetorheological fluid flow channel 11 below the inner cylinder 4 and the outer cylinder 3 is communicated, the floating piston 5 is installed between the inner cylinder 4 and the outer cylinder 3, the upper part of the floating piston 5 is gas, the movement of the floating piston 5 can compensate the volume difference of the piston rod 2 when the piston body 101 moves, and the lower part is magnetorheological fluid. Compared with the traditional single-cylinder magnetorheological damper, the double-cylinder magnetorheological damper provided by the utility model can realize larger damper stroke in limited space, and then consume more energy. Meanwhile, the double-cylinder structure can obtain longer stroke and adapt to more use scenarios under the condition that the axial length is certain.

[0081] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] The basic principles, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A simple-structured, long-stroke double-cylinder magnetorheological damper, characterized in that, include: The inner cylinder (4) has a first accommodating space for accommodating magnetorheological fluid. The outer cylinder (3) is sleeved on the outside of the inner cylinder (4), and a second accommodating space (30) is formed between the outer cylinder (3) and the inner cylinder (4); A piston body (101) is slidably disposed in a first accommodating space. The piston body (101) divides the first accommodating space into an upper inner cylinder chamber (6) and a lower inner cylinder chamber (15). An annular flow channel is provided on the piston body (101). The upper inner cylinder chamber (6) and the lower inner cylinder chamber (15) are connected through the annular flow channel. A magnetorheological fluid flow channel (11) is provided on the lower inner cylinder chamber (15). The first accommodating space and the second accommodating space (30) are connected through the magnetorheological fluid flow channel (11). Piston rod (2), one end of which is connected to piston body (101), and the other end of which is located outside inner cylinder (4); An excitation coil (9) is disposed inside the piston body (101) and is used to generate a magnetic field. A floating piston (5) is disposed in a second accommodating space (30), which divides the second accommodating space (30) into a gas storage chamber (20) and a magnetorheological fluid sub-chamber (301).

2. The double-cylinder magnetorheological damper with simple structure and large stroke according to claim 1, characterized in that, The piston rod (2) is also provided with a piston rod guide (22) on the outside, and the piston rod guide (22) is sealed on the top of the outer cylinder (3).

3. The double-cylinder magnetorheological damper with simple structure and large stroke according to claim 2, characterized in that, The piston rod guide (22) is also provided with an oil seal pressure ring (21).

4. The double-cylinder magnetorheological damper with simple structure and large stroke according to claim 1, characterized in that, The piston rod (2) is provided with an upper lifting lug (1) at the end away from the piston body (101).

5. A simple-structured, large-stroke double-cylinder magnetorheological damper according to claim 4, characterized in that, The upper lifting lug (1) is provided with an upper lifting lug bushing (24), and the upper lifting lug (1) is provided with an upper lifting lug vibration isolation sleeve (23).

6. The double-cylinder magnetorheological damper with simple structure and large stroke according to claim 1, characterized in that, The gas storage chamber (20) is used to store high-pressure gas, and the magnetorheological fluid sub-chamber (301) is used to contain magnetorheological fluid.

7. A simple-structured, large-stroke double-cylinder magnetorheological damper according to claim 1, characterized in that, The bottom of the outer cylinder (3) is provided with a lower lifting lug (12).

8. A simple-structured, large-stroke double-cylinder magnetorheological damper according to claim 7, characterized in that, The lower lifting lug (12) is provided with a lower lifting lug bushing (14), and the lower lifting lug (12) is provided with a lower lifting lug vibration isolation sleeve (13).

9. A simple-structured, large-stroke double-cylinder magnetorheological damper according to claim 1, characterized in that, The floating piston (5) is also provided with a sealing ring on its exterior.

10. A simple-structured, large-stroke double-cylinder magnetorheological damper according to claim 1, characterized in that, The floating piston (5) is also provided with a floating piston guide.

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