Output Enhanced Magnetorheological Damper

Abstract

The present invention provides an output-enhanced magnetorheological damper, which includes: a cylinder and a magnetorheological cylinder, the open end of the magnetorheological cylinder is connected to the opening of the first end of the cylinder, and the cross-sectional area of ​​the magnetorheological cylinder is smaller than the cross-sectional area of ​​the cylinder; a magnetorheological piston assembly is installed in the magnetorheological cylinder, and the magnetorheological piston assembly can reciprocate along the magnetorheological cylinder; a piston assembly is installed at the second end opening of the cylinder, and the piston assembly can reciprocate along the cylinder; a chamber is formed between the magnetorheological piston assembly and the piston assembly, and a liquid for transmitting pressure is contained in the chamber, and when the piston assembly moves, the liquid pushes the magnetorheological piston assembly to move, and the magnetorheological piston assembly generates an adjustable damping force under the action of an excitation current. The present invention adopts a magnetorheological composite material, reduces the requirements for sealing, and reduces the amount of magnetorheological fluid, so that the output-enhanced magnetorheological damper has a simple structure, is easy to maintain, and has good economy.

Description

Technical Field

[0001] The invention relates to the field of equipment vibration isolation, and in particular to an output-enhanced magnetorheological damper. Background Art

[0002] In the prior art, a magnetorheological damper is a semi-active intelligent device and is generally classified into shear-type, extrusion-type and valve-type magnetorheological dampers according to their working modes.

[0003] Among them, the shear type MR damper has a wide adjustable range, but the output force is relatively small. The extrusion type MR damper has a large output force, but a small working stroke. The output force and adjustable range of the valve type MR damper are between the two, but in some applications, there are still problems such as insufficient adjustable range and insufficient output force.

[0004] In addition, the magnetorheological damper is prone to high-frequency hardening under high-frequency conditions, which leads to a decrease in the performance of the magnetorheological damper.

[0005] In view of this, the inventor of the present application designed an output-enhanced magnetorheological damper in order to overcome the above-mentioned technical problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art magnetorheological damper in that the adjustable range is not enough and the output force is not enough, and to provide an output-enhanced magnetorheological damper.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] An output-enhanced magnetorheological damper is characterized in that the output-enhanced magnetorheological damper comprises:

[0009] A cylinder and a magnetorheological cylinder, wherein the open end of the magnetorheological cylinder is connected to the opening of the first end of the cylinder, and the cross-sectional area of ​​the magnetorheological cylinder is smaller than the cross-sectional area of ​​the cylinder;

[0010] A magnetorheological piston assembly is installed in the magnetorheological cylinder, and the magnetorheological piston assembly can reciprocate along the magnetorheological cylinder;

[0011] A piston assembly is mounted at the second end opening of the cylinder barrel, and the piston assembly can reciprocate along the cylinder barrel;

[0012] A chamber is formed between the magnetorheological piston assembly and the piston assembly, and a force transmission medium for transmitting pressure is contained in the chamber. When the piston assembly moves, the force transmission medium pushes the magnetorheological piston assembly to move, and the magnetorheological piston assembly generates an adjustable damping force under the action of the excitation current;

[0013] The magnetorheological piston assembly comprises a magnetorheological piston, an excitation coil and a magnetorheological composite material. The excitation coil is wound around the magnetorheological piston, and the magnetorheological composite material is fixed on the outer wall surface of the magnetorheological piston.

[0014] According to one embodiment of the present invention, the chamber includes a first chamber and a second chamber that are interconnected, the first chamber is located between the magnetorheological piston assembly and the magnetorheological cylinder, and the second chamber is located between the piston assembly and the cylinder.

[0015] According to one embodiment of the present invention, a cross-sectional area of ​​the first chamber is smaller than a cross-sectional area of ​​the second chamber.

[0016] According to an embodiment of the present invention, the magnetorheological cylinder is made of ferromagnetic material, an annular gap is formed between the magnetorheological cylinder and the magnetorheological piston, and the magnetorheological composite material is located in the annular gap.

[0017] According to one embodiment of the present invention, the piston assembly includes a piston and a piston rod, the piston is installed in the cylinder, and the piston rod is connected to the piston and extends outward.

[0018] According to one embodiment of the present invention, the second end opening of the cylinder is installed with an end cover, and the end cover passes through the piston rod and is fixed at the second end opening.

[0019] According to an embodiment of the present invention, the output-enhanced magnetorheological damper further includes an elastic component, one end of which contacts the magnetorheological piston assembly, and the other end of which contacts the bottom of the magnetorheological cylinder.

[0020] According to one embodiment of the present invention, the force transmission medium is hydraulic oil.

[0021] According to an embodiment of the present invention, the magnetorheological composite material is prepared by dispersing magnetorheological fluid in non-woven fabric.

[0022] The positive and progressive effects of the present invention are:

[0023] The output-enhanced magnetorheological damper of the present invention has the following advantages:

[0024] 1. Under the premise of having a large adjustable range, it can generate a larger output damping force and can effectively alleviate the influence of high-frequency hardening on the performance of the magnetorheological damper under high-frequency conditions;

[0025] Second, the use of magnetorheological composite materials reduces the sealing requirements of the output-enhanced magnetorheological damper and reduces the amount of magnetorheological fluid used, making the output-enhanced magnetorheological damper simple in structure, easy to maintain, and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0027] Figure 1 It is a schematic diagram of the internal structure of the output-enhanced magnetorheological damper of the present invention.

[0028] Figure 2 for Figure 1 Magnified view of part B.

[0029] Figure 3 It is a stereoscopic diagram of the output-enhanced magnetorheological damper of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the magnetorheological piston in the output-enhanced magnetorheological damper of the present invention.

[0031] Figure 5 It is a schematic diagram of the structure of the piston in the output-enhanced magnetorheological damper of the present invention.

[0032] [Reference Signs]

[0033] Cylinder 10

[0034] Magnetorheological cylinder 20

[0035] First end opening 11

[0036] The second end opening 12

[0037] End cap 13

[0038] The open end of the magnetorheological cylinder 21

[0039] Cylinder bottom 22

[0040] Lead hole 221

[0041] Transmission medium A

[0042] First chamber 30

[0043] Second chamber 40

[0044] Magnetorheological piston 50

[0045] Excitation coil 51

[0046] Magnetorheological composite materials52

[0047] Wire slot 53

[0048] Piston 60

[0049] Piston rod 61

[0050] Blind hole 62

[0051] Elastic member 70

[0052] Bolt 100

[0053] Plug 200

[0054] First sealing ring 300

[0055] Second sealing ring 310

[0056] First guide belt 400

[0057] The second guide belt 410 DETAILED DESCRIPTION

[0058] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0059] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0060] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this document.

[0061] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0062] like Figure 1 and Figure 3 As shown, the present invention discloses an output-enhanced magnetorheological damper, which includes: a cylinder 10, a magnetorheological cylinder 20, a magnetorheological piston assembly and a piston assembly, wherein the opening end 21 of the magnetorheological cylinder 20 is connected to the opening 11 of the first end of the cylinder 10, and the cross-sectional area of ​​the magnetorheological cylinder 20 is smaller than the cross-sectional area of ​​the cylinder 10. For example, in this embodiment, the cylinder 10 and the magnetorheological cylinder 20 are connected by bolts 100.

[0063] The magnetorheological piston assembly is installed in the magnetorheological cylinder 20 and can reciprocate along the magnetorheological cylinder 20. The piston assembly is installed at the second end opening 12 of the cylinder 10 and can reciprocate along the cylinder 10.

[0064] Through the above structure, a chamber is formed between the magnetorheological piston assembly and the piston assembly, and the chamber is filled with a force transmission medium A for transmitting pressure. For example, the force transmission medium A is preferably hydraulic oil. Of course, the liquid A here is only an example and is not a limitation. Other force transmission media can also be used. An oil injection hole is provided on the wall surface of the cylinder 10, which is sealed by a plug 200, and the force transmission medium A is injected through the oil injection hole.

[0065] Preferably, the chamber in this embodiment includes a first chamber 30 and a second chamber 40 that are interconnected, the first chamber 30 is located between the magnetorheological piston assembly and the magnetorheological cylinder 20, and the second chamber 40 is located between the piston assembly and the cylinder 10. For example, in this embodiment, the cross-sectional area of ​​the first chamber 30 is smaller than the cross-sectional area of ​​the second chamber 40. When the piston assembly moves, the force transmission medium A pushes the magnetorheological piston assembly to move, and under the action of the excitation current, the magnetorheological piston assembly generates an adjustable damping force, and the change in the cross-sectional area between the magnetorheological cylinder 20 and the cylinder 10 can amplify the adjustable damping force. The generation of the adjustable damping force here is mainly controlled by the current. The larger the excitation current, the stronger the excitation magnetic field, and the larger the adjustable damping force.

[0066] Preferably, if Figure 4 Combination Figure 1 As shown, the magnetorheological piston assembly includes a magnetorheological piston 50, an excitation coil 51 and a magnetorheological composite material 52. The excitation coil 51 is wound around the magnetorheological piston 50 and can generate an excitation magnetic field when powered on. The magnetorheological composite material 52 is fixed on the outer wall surface of the magnetorheological piston 50.

[0067] For example, a wire groove 53 (such as Figure 5 As shown in the figure, the excitation coil 51 is wound in the wire slot 53, and the lead wire of the excitation coil 51 passes through the inner cavity of the magnetorheological cylinder 20 and is led out from the lead wire hole 221 on the end surface of the cylinder bottom 22.

[0068] In the present application, the magnetorheological composite material 52 is fixed on the outer cylindrical surface of the magnetorheological piston 50, and the adjustable damping force generated is mainly composed of the Coulomb force between the magnetorheological piston 50 and the cylinder 10. The magnetorheological composite material 52 is fixed relative to the magnetorheological piston during the operation of the magnetorheological damper.

[0069] The enlarged view of the magnetorheological composite material 52 is shown in FIG. Figure 2As shown. The magnetorheological composite material 52 can be preferably prepared by dispersing magnetorheological fluid in non-woven fabric. This magnetorheological composite material 52 only requires a small amount of magnetorheological fluid to be dispersed in the non-woven fabric to achieve the purpose. Since magnetorheological fluid is expensive, the economy of using magnetorheological composite materials is very good.

[0070] In addition, due to the presence of ferromagnetic particles in the magnetorheological fluid, the friction and wear of the magnetorheological damper seal is relatively serious. The use of magnetorheological composite materials in the present application can reduce the requirements of the damper for sealing.

[0071] Furthermore, in order to reduce the weight of the magnetorheological piston 50, one side of the magnetorheological piston 50 may be configured as a hollow structure (eg Figure 1 As shown), becoming a part of the first chamber 30, or being connected to the first chamber 30.

[0072] In this embodiment, the magnetorheological cylinder 20 is preferably made of ferromagnetic material, and an annular gap is formed between the magnetorheological cylinder 20 and the magnetorheological piston 50, so that the magnetorheological composite material 52 is located in the annular gap. The magnetorheological piston 50 can be preferably cylindrical, and the magnetorheological composite material 52 is fixed on the outer cylindrical surface of the magnetorheological piston 50, and can produce a magnetorheological effect under the action of an excitation magnetic field. When an electric current is applied to the excitation coil 51, an excitation magnetic field that passes vertically through the annular gap can be generated. By changing the magnitude of the current, the magnetorheological effect produced by the magnetorheological piston 50 can be controlled. A first guide belt 400 is installed on the magnetorheological piston 50, which can play a supporting and guiding role.

[0073] Preferably, the piston assembly includes a piston 60 and a piston rod 61. The piston 60 is installed in the cylinder 10. The piston rod 61 is connected to the piston 60 (for example, in this embodiment, the piston rod 61 and the piston 60 are connected by threads) and extend outward. An end cover 13 is installed at the second end opening 12 of the cylinder 10. The end cover 13 passes through the piston rod 61 and is fixed at the second end opening 12 (for example, the end cover 13 and the cylinder 10 are connected by threads). The second guide belt 410 is respectively installed on the piston 60 and the end cover 13, which can support and guide the piston rod 61 and the piston 60.

[0074] In addition, in order to reduce the weight of the piston rod 61 , a blind hole 62 may be processed on the piston rod 61 .

[0075] Further preferably, in order to ensure the airtightness of the chamber, a first sealing ring 300 may be installed on the magnetorheological piston 50 and the piston 60 for dynamic sealing, and a second sealing ring 310 may be used to perform static sealing between the cylinder 10 and the magnetorheological cylinder 20 .

[0076] In addition, the output-enhanced magnetorheological damper further includes an elastic component 70 , one end of the elastic component 70 is in contact with the magnetorheological piston assembly, and the other end is in contact with the cylinder bottom 22 of the magnetorheological cylinder 20 .

[0077] Here, the elastic component 70 may preferably be a return spring, which is installed in the magnetorheological cylinder 20 and is in a compressed state, so as to provide the damper with the elastic force required for resetting. The cylinder bottom 22 and the magnetorheological cylinder 20 may preferably be connected by threads, so that the return spring has a certain amount of pre-compression.

[0078] As described in the above structure, combined Figure 1 When the piston rod 61 of the output-enhanced magnetorheological damper is in an extended state, when the piston 60 and the piston rod 61 are forced to move to the left, the output-enhanced magnetorheological damper is in a compression stroke, and the piston 60 pushes the hydraulic oil from the inner cavity of the cylinder 10 into the inner cavity of the magnetorheological cylinder 20. Since the pressure of the force transmission medium is equal and the cross-sectional area is reduced, the hydraulic pressure acting on the right end face of the magnetorheological piston 50 is inversely proportional to the ratio of the cross-sectional areas of the cylinder 10 and the magnetorheological cylinder 20. The movement speed and displacement of the magnetorheological piston 50 are proportional to the ratio of the cross-sectional areas of the cylinder 10 and the magnetorheological cylinder 20.

[0079] The principle of the output-enhanced magnetorheological damper is as follows: hydraulic oil is contained in the chamber between the magnetorheological piston 50 and the piston 60. When the piston 60 moves, the pressure acting on the left end face of the piston 60 and the right end face of the magnetorheological piston 50 is the same (combined with Figure 1 As shown). Since the cross-sectional areas of the magnetorheological cylinder 20 and the cylinder 10 are different, the output-enhanced magnetorheological damper will proportionally amplify the adjustable damping force generated by the magnetorheological piston 50. Its proportionality coefficient is the ratio of the cross-sectional area of ​​the cylinder 10 to the cross-sectional area of ​​the magnetorheological cylinder 20. Under high-frequency working conditions, since the displacement of the magnetorheological piston 50 is amplified, the influence of high-frequency hardening on the performance of the magnetorheological damper can be effectively alleviated by amplifying the displacement.

[0080] Therefore, the output-enhanced magnetorheological damper of the present invention solves the problems of insufficient adjustable range and insufficient output force of current magnetorheological dampers, and alleviates the problem of decreased performance of magnetorheological dampers caused by high-frequency hardening under high-frequency conditions.

[0081] The present invention designs an output-enhanced magnetorheological damper based on magnetorheological composite materials. Under the premise of having a large adjustable range, it can generate a larger output damping force and can effectively alleviate the influence of high-frequency hardening on the performance of the magnetorheological damper under high-frequency conditions.

[0082] For those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary implementation of the present application.

[0083] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0084] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus facilitate the understanding of one or more embodiments of the invention, in the foregoing description of the embodiments of this application, multiple features are sometimes grouped into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those mentioned in the claims. In fact, the features of an embodiment are less than all the features of a single embodiment disclosed above.

[0085] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An output-enhanced magnetorheological damper, characterized in that: The output-enhanced magnetorheological damper comprises: A cylinder and a magnetorheological cylinder, wherein the open end of the magnetorheological cylinder is connected to the opening of the first end of the cylinder, and the cross-sectional area of ​​the magnetorheological cylinder is smaller than the cross-sectional area of ​​the cylinder; A magnetorheological piston assembly is installed in the magnetorheological cylinder, and the magnetorheological piston assembly can reciprocate along the magnetorheological cylinder; A piston assembly is mounted at the second end opening of the cylinder barrel, and the piston assembly can reciprocate along the cylinder barrel; A chamber is formed between the magnetorheological piston assembly and the piston assembly, and a force transmission medium for transmitting pressure is contained in the chamber. When the piston assembly moves, the force transmission medium pushes the magnetorheological piston assembly to move, and the magnetorheological piston assembly generates an adjustable damping force under the action of the excitation current; The magnetorheological piston assembly comprises a magnetorheological piston, an excitation coil and a magnetorheological composite material, wherein the excitation coil is wound around the magnetorheological piston, and the magnetorheological composite material is fixed on the outer wall surface of the magnetorheological piston; The chamber comprises a first chamber and a second chamber which are interconnected, wherein the first chamber is located between the magnetorheological piston assembly and the magnetorheological cylinder, and the second chamber is located between the piston assembly and the cylinder; A cross-sectional area of ​​the first chamber is smaller than a cross-sectional area of ​​the second chamber.

2. The output-enhanced magnetorheological damper according to claim 1, characterized in that: The magnetorheological cylinder is made of ferromagnetic material, an annular gap is formed between the magnetorheological cylinder and the magnetorheological piston, and the magnetorheological composite material is located in the annular gap.

3. The output-enhanced magnetorheological damper according to claim 1, characterized in that: The piston assembly comprises a piston and a piston rod. The piston is installed in the cylinder. The piston rod is connected to the piston and extends outward.

4. The output-enhanced magnetorheological damper according to claim 3, characterized in that: The second end opening of the cylinder is equipped with an end cover, and the end cover passes through the piston rod and is fixed at the second end opening.

5. The output-enhanced magnetorheological damper according to claim 1, characterized in that: The output-enhanced magnetorheological damper further includes an elastic component, one end of which is in contact with the magnetorheological piston assembly, and the other end of which is in contact with the cylinder bottom of the magnetorheological cylinder.

6. The output-enhanced magnetorheological damper according to claim 1, characterized in that: The force transmission medium is hydraulic oil.

7. The output-enhanced magnetorheological damper according to claim 1, characterized in that: The magnetorheological composite material is prepared by dispersing magnetorheological fluid in non-woven fabric.

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