A vibration damping device based on magneto-rheological elastomers

Abstract

The application discloses a damping device based on a magneto-rheological elastomer, which comprises a connecting assembly, a first magneto-rheological adjusting assembly, an elastic adjusting assembly and a second magneto-rheological adjusting assembly; the connecting assembly is connected with the first magneto-rheological adjusting assembly, and two ends of the elastic adjusting assembly are connected with the connecting assembly and the second magneto-rheological adjusting assembly respectively; the connecting assembly can convert part of the load received into torque, transmit part of the pressure to the first magneto-rheological adjusting assembly, and transmit the rest of the load to the second magneto-rheological adjusting assembly through the elastic adjusting assembly; the first magneto-rheological adjusting assembly is used for adjusting the stiffness and damping of the damping device, and the second magneto-rheological adjusting assembly is used for adjusting the stiffness of the damping device; and the damping device can realize independent control of the damping and the stiffness simultaneously.

Description

Technical Field

[0001] This invention relates to the field of mechanical automation technology, and specifically to a vibration reduction device based on a magnetorheological elastomer. Background Technology

[0002] Magnetorheological elastomers (MREs) exhibit a change in elastic modulus based on the strength of an external magnetic field, demonstrating strong controllability, stability, and rapid response. Therefore, the elastic modulus of MREs can be controlled by applying magnetic fields of varying magnitudes, thereby altering their mechanical properties. In vibration damping devices, MREs in compression mode possess a greater load-bearing capacity, and some existing designs leverage this to create adjustable-stiffness vibration damping devices. Additionally, some designs utilize MREs in a shear-compression hybrid mode, incorporating this hybrid operating mode within the same magnetic circuit.

[0003] CN217558872U describes a vibration isolator in which the internal MRE operates in a compression mode. The MRE and soft iron sheets are stacked and, together with the outer shell and threaded guide posts, form a closed magnetic circuit. A magnetic field is generated by an energized coil, and changing the current alters the elastic modulus of the MRE. CN104895986A describes a frequency converter vibration isolator in which the internal MRE operates in a shear mode. A ring-shaped MRE is placed on the side of the load shaft; the vertical movement of the shaft subjects the MRE to shear forces. The magnetic field is generated by an internal magnet; the vertical movement of the shaft changes the pressure in the upper and lower cavities, causing a change in the position of the magnetic field between the two cavities, thus controlling the change in the MRE's modulus. CN207687250U describes a vibration isolator in which the internal MRE operates in both shear and compression modes. In shear mode, the MRE is ring-shaped and arranged near the upper and lower ends of the shaft, contacting the sides. In compression mode, the MRE is spaced from the center of the shaft. The two types of MREs are connected by an iron core, forming a closed magnetic circuit together with the shaft. The magnetic field is generated by energized coils surrounding the two compression MREs; changing the current controls the elastic modulus and shear modulus of the MREs. CN114321257A describes a vibration damper where the internal MREs are in compression mode. A hollow cylindrical MRE with a certain wall thickness is connected in parallel with a spring and placed below a flat plate at the lower end of the shaft. The magnetic field is generated by energized coils on the outside of the MREs; changing the current changes the elastic modulus of the MREs. CN109899443A describes a vibration damping device where the internal MREs are in shear mode. Several MREs and multiple sandwich steel plates are placed parallel and vertically, forming a closed magnetic circuit with a steel cylinder and a base. The magnetic field is generated by energized coils below. A vibration platform moves the steel plates up and down, causing the MREs to undergo shear deformation. CN106321702A designs a vibration damper in which the internal MRE operates in both shear and compression modes. The central MRE and magnetic plate are stacked in compression mode; a shear-mode annular MRE is placed on the flange side of the load shaft, forming a closed magnetic circuit with the mounting base and magnetic cylinder. The magnetic field is provided by a lower energized coil. CN111750026B designs a vibration absorber in which the internal MRE operates in shear mode. Two hollow cylindrical MREs are fitted inside and outside the magnetic cylinder, with an energized coil generating a magnetic field both inside and outside. When the shaft moves, it drives the inner and outer magnetic cylinders, creating shear between them and the MREs. CN113757298A designs a vibration absorber in which the internal MRE operates in both compression and shear modes. The extrusion-mode MRE is similar to most designs, consisting of a stacked structure of MRE and magnetic material; in this design, the shear-mode MRE is a hollow sheet with a drive shaft passing through it, and a small inner portion of the MRE contacts the shaft, resulting in shear deformation.

[0004] In existing technologies, for MREs operating in compression mode, the force-bearing component is directly applied to the MRE, either directly or through intermediate force-transmitting parts, with the force-bearing component, intermediate force-transmitting parts, and the MRE all arranged in a straight line. For MREs operating in shear mode, there are various arrangement options. For example, a ring-shaped MRE can be used in direct contact with the moving shaft to induce shear deformation; parallel clamps fixed to the moving component can be stacked vertically with the MRE, and movement of the clamps causes shear deformation; or metal cylinders of varying sizes can be fitted onto a cylindrical MRE, and movement of the cylinders causes shear deformation. Existing solutions cannot achieve independent control of damping and stiffness.

[0005] In summary, how to achieve independent control of damping and stiffness is one of the important problems that urgently need to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a vibration reduction device based on magnetorheological elastomers to overcome the shortcomings of the prior art, which can simultaneously achieve independent control of damping and stiffness.

[0007] This invention provides a vibration reduction device based on a magnetorheological elastomer, including a connecting component, a first magnetorheological adjustment component, an elastic adjustment component, and a second magnetorheological adjustment component;

[0008] The connecting component is connected to the first magnetorheological adjustment component, and the two ends of the elastic adjustment component are respectively connected to the connecting component and the second magnetorheological adjustment component;

[0009] The connecting component can convert part of the load into pressure and torque and transmit it to the first magnetorheological adjustment component, and transmit the remaining pressure to the second magnetorheological adjustment component via the elastic adjustment component;

[0010] The first magnetorheological adjustment component is used to adjust the stiffness and damping of the vibration damping device, and the second magnetorheological adjustment component is used to adjust the stiffness of the vibration damping device.

[0011] The vibration damping device based on magnetorheological elastomer described above may optionally include a housing.

[0012] The shell is cylindrical;

[0013] The connecting component, the first magnetorheological adjustment component, the elastic adjustment component, and the second magnetorheological adjustment component are installed sequentially along the axial direction of the housing, and the connecting component can pass through the first magnetorheological adjustment component to connect with the elastic adjustment component.

[0014] The vibration damping device based on magnetorheological elastomer described above may optionally include an end cap and a base.

[0015] The end caps and bases are respectively installed at both ends of the housing; the connecting assembly includes a pressure-bearing rod and a pressure-receiving ring;

[0016] The pressure ring is located between the first magnetorheological adjustment component and the end cap; the pressure rod passes through the first magnetorheological adjustment component and abuts against the elastic adjustment component;

[0017] The pressure-bearing rod passes through the pressure-receiving ring, and the pressure-bearing rod and the pressure-receiving ring are connected by threads or grooves to convert the axial force on the pressure-bearing rod into axial force and torque.

[0018] In the vibration damping device based on magnetorheological elastomers as described above, optionally, the first magnetorheological adjustment component includes an annular magnetic guide block, a first sleeve, a first coil, and an annular magnetorheological elastomer.

[0019] The annular magnetic conductive block is installed inside the housing, and the annular magnetic conductive block, the housing, the end cap, the pressure ring, and the annular magnetorheological elastomer form a first annular cavity; the end cap, the pressure ring, the annular magnetorheological elastomer, and the annular magnetic conductive block abut against each other in sequence;

[0020] The first sleeve is located inside the first annular cavity, and the first coil is sleeved on the first sleeve;

[0021] The end cap, the housing, the annular magnetic block, and the pressure ring are all made of magnetic material.

[0022] In the vibration damping device based on magnetorheological elastomer described above, optionally: a limiting ring is provided inside the housing; the elastic adjustment component is installed between the limiting ring and the first magnetorheological adjustment component;

[0023] The elastic adjustment assembly includes a top plate, an elastic element, and a bottom plate;

[0024] The two ends of the elastic element abut against the top plate and the bottom plate respectively, and the top plate abuts against the connecting assembly;

[0025] The second magnetorheological adjustment component can pass through the limiting ring and abut against the base plate.

[0026] In the vibration damping device based on magnetorheological elastomer as described above, optionally: the elastic adjustment component further includes a second sleeve, the second sleeve is installed inside the housing, and one end of the second sleeve abuts against the limiting ring, and the other end abuts against the first magnetorheological adjustment component;

[0027] The top plate and the bottom plate are slidably connected to the second sleeve.

[0028] In the vibration damping device based on magnetorheological elastomer as described above, optionally: the second magnetorheological adjustment component includes a magnetic column, a circular metal sheet, a circular magnetorheological elastomer, and a second coil;

[0029] The circular metal sheet and the circular magnetorheological elastomer are stacked alternately and located between the magnetic post and the base; the magnetic post passes through the inner hole of the limiting ring and abuts against the base plate;

[0030] The second coil is located between the limiting ring and the base, and is sleeved on the outer periphery of the circular metal sheet and the circular magnetorheological elastomer.

[0031] In the vibration damping device based on magnetorheological elastomer as described above, optionally: the second magnetorheological adjustment component further includes a third sleeve, which is sleeved on the outer periphery of the magnetic column, the circular metal sheet and the circular magnetorheological elastomer;

[0032] The second coil is wound around the outer periphery of the third sleeve.

[0033] In the vibration damping device based on magnetorheological elastomers as described above, optionally, the base, the circular metal sheet, and the magnetic column are all made of magnetically conductive material.

[0034] In the vibration damping device based on magnetorheological elastomers as described above, optionally, the housing is provided with wire holes for wires to pass through.

[0035] The vibration damping device based on a magnetorheological elastomer as described above, wherein, preferably,

[0036] Compared with existing technologies, this invention utilizes the cooperation between a first magnetorheological adjustment component and a connecting component. The first magnetorheological adjustment component adjusts the damping and stiffness of the vibration damper, while the second magnetorheological adjustment component adjusts the stiffness. Therefore, through the cooperation between the first and second magnetorheological adjustment components, independent adjustment of the damping and stiffness of the vibration damping device can be achieved. When damping needs to be adjusted alone, the first magnetorheological adjustment component is controlled to achieve the corresponding adjustment amount. At this time, the stiffness also changes accordingly. The second magnetorheological adjustment component counteracts the change in stiffness caused by the change in the first magnetorheological adjustment component, thus achieving adjustment only for damping. When stiffness needs to be adjusted alone, the second magnetorheological adjustment component is controlled to directly adjust the stiffness. When both damping and stiffness need to be adjusted simultaneously, the first magnetorheological adjustment component adjusts the damping to the corresponding value. At this time, the stiffness also changes accordingly under the action of the first magnetorheological adjustment component, and then the second magnetorheological adjustment component adjusts the stiffness to the required value. This allows for simultaneous and separate control of stiffness and damping. Attached Figure Description

[0037] Figure 1 This is a half-sectional view of the vibration damper proposed in this invention;

[0038] Figure 2 This is a partial cross-sectional view of the first magnetorheological adjustment component proposed in this invention;

[0039] Figure 3 This is a partial cross-sectional view of the second magnetorheological adjustment component proposed in this invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1 - Connecting component, 2 - First magnetorheological adjustment component, 3 - Elastic adjustment component, 4 - Second magnetorheological adjustment component, 5 - Housing, 6 - End cap, 7 - Base;

[0042] 11 – Bearing rod; 12 – Compression ring;

[0043] 21 – Annular magnetic conductor block, 22 – First sleeve, 23 – First coil, 24 – Annular magnetorheological elastic body, 25 – First magnetic circuit;

[0044] 31 - Top plate, 32 - Elastic element, 33 - Bottom plate, 34 - Second sleeve;

[0045] 41 – Magnetic post; 42 – Circular metal sheet; 43 – Circular magnetorheological elastic body; 44 – Second coil; 45 – Third sleeve; 46 – Second magnetic circuit.

[0046] 51 - Limiting ring, 52 - Wire hole. Detailed Implementation

[0047] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0048] The main reason why damping and stiffness cannot be controlled independently and simultaneously, as mentioned in the background art, is that MRE materials are typically used in extrusion, shear, or a hybrid extrusion-shear mode. The extrusion-shear mode corresponds to the synchronous change of damping and stiffness, while the extrusion mode corresponds to a change in stiffness, and the shear mode corresponds to a change in damping. When damping changes, stiffness always changes. Therefore, how to achieve independent control of damping and stiffness under different conditions, as well as simultaneous control of damping and stiffness in any proportion within a certain range, is one of the important problems urgently needing to be solved in this field. To solve this problem, the present invention designs the following embodiments.

[0049] Example 1

[0050] Please refer to Figures 1 to 3This embodiment proposes a vibration damping device based on a magnetorheological elastomer, comprising a connecting component 1, a first magnetorheological adjustment component 2, an elastic adjustment component 3, and a second magnetorheological adjustment component 4. The connecting component 1 is connected to the structure requiring vibration damping and, when subjected to axial load, generates torque and pressure that are transmitted to the first magnetorheological adjustment component 2. The pressure is then transmitted to the second magnetorheological adjustment component 4 via the elastic adjustment component 3. The connecting component 1 is connected to the first magnetorheological adjustment component 2, and both ends of the elastic adjustment component 3 are connected to the connecting component 1 and the second magnetorheological adjustment component 4, respectively. The connecting component 1 can convert part of the received load into pressure and torque, which are transmitted to the first magnetorheological adjustment component 2, and the remaining pressure is transmitted to the second magnetorheological adjustment component 4 via the elastic adjustment component 3. The first magnetorheological adjustment component 2 is used to adjust the stiffness and damping of the vibration damping device, and the second magnetorheological adjustment component 4 is used to adjust the stiffness of the vibration damping device.

[0051] In practical implementation, when damping needs to be adjusted separately, the first magnetorheological adjustment component 2 is controlled to achieve the corresponding adjustment amount. At this time, the stiffness also changes accordingly. The second magnetorheological adjustment component 4 is used to offset the change in stiffness caused by the change in the first magnetorheological adjustment component 2, thus achieving adjustment only for damping. When stiffness needs to be adjusted separately, the second magnetorheological adjustment component 4 is controlled to directly adjust the stiffness. When both damping and stiffness need to be adjusted simultaneously, the first magnetorheological adjustment component 2 is used to adjust the damping to the corresponding value. At this time, the stiffness also changes accordingly under the action of the first magnetorheological adjustment component 2. Then, the second magnetorheological adjustment component 4 is used to adjust the stiffness to the required value. This allows for separate control of stiffness and damping.

[0052] In practical implementation, to facilitate the installation and arrangement of the connecting component 1, the first magnetorheological adjustment component 2, the elastic adjustment component 3, and the second magnetorheological adjustment component 4, the vibration damping device in this embodiment further includes a housing 5. The housing 5 is cylindrical; in specific implementations, the shape of the housing 5 can be a square cylinder, an elliptical cylinder, etc. As a preferred solution, in this embodiment, the housing 5 is a cylinder.

[0053] Specifically, in order to achieve the effect of changing damping and stiffness of the first magnetorheological adjustment component 2, axial force and torque transmission are required between the first magnetorheological adjustment component 2 and the connecting component 1, that is, the first magnetorheological adjustment component 2 should be able to operate in a shear-compression mode. Specifically, the connecting component 1, the first magnetorheological adjustment component 2, the elastic adjustment component 3, and the second magnetorheological adjustment component 4 are installed sequentially along the axial direction of the housing 5, and the connecting component 1 can pass through the first magnetorheological adjustment component 2 to connect with the elastic adjustment component 3. Specifically, the first magnetorheological adjustment component 2 is annular, allowing some components of the connecting component 1 to pass through.

[0054] By setting the first magnetorheological adjustment component 2 as a ring and cooperating with the connecting component 1, linear motion is converted into rotational motion, and the stiffness and damping adjustment limit can be easily improved by increasing the contact area between the MRE and the moving parts.

[0055] In a specific implementation, the vibration damping device further includes an end cap 6 and a base 7. Specifically, the end cap 6 and the base 7 are respectively installed at both ends of the housing 5. The connection between the end cap 6 and the base 7 is a fixed connection, which can be a threaded connection, welding, or interference fit, etc.

[0056] To convert axial force into pressure and torque for transmission to the first magnetorheological adjustment component 2, this embodiment makes the following improvements: the connecting component 1 includes a pressure-bearing rod 11 and a pressure-receiving ring 12. The pressure-receiving ring 12 is located between the first magnetorheological adjustment component 2 and the end cap 6; the pressure-bearing rod 11 passes through the first magnetorheological adjustment component 2 and abuts against the elastic adjustment component 3; the pressure-bearing rod 11 passes through the pressure-receiving ring 12, and the pressure-bearing rod 11 and the pressure-receiving ring 12 are connected by threads to convert part of the axial force on the pressure-bearing rod 11 into axial force and torque.

[0057] In practical use, when the pressure-bearing rod 11 and the pressure-receiving ring 12 are threadedly connected, the thread helix angle of the thread is greater than the equivalent friction angle, that is, the thread between the pressure-bearing rod 11 and the pressure-receiving ring 12 cannot be a self-locking thread. This allows the pressure-bearing ring 12 to have a tendency to rotate when the pressure-bearing rod 11 is subjected to axial force.

[0058] When the bearing rod 1 is subjected to axial load via the aforementioned connecting component 1, depending on the specific design, the connecting component 1 has two different modes of movement:

[0059] In the first mode of motion, when the frictional torque between the pressure rod 11 and the pressure ring 12 is greater than the frictional torque of the support surface on the pressure ring 12, the pressure rod 11 moves linearly and the pressure ring 12 rotates significantly around its central axis, resulting in relative motion on the MRE contact surface of the first magnetorheological adjustment component 2.

[0060] In the second motion mode, when the frictional torque between the pressure rod 11 and the pressure ring 12 is less than the frictional torque of the support surface on the pressure ring 12, the pressure rod 11 moves linearly while rotating around its central axis, and the pressure ring 12 rotates slightly around its central axis. There is no relative motion on the MRE contact surface of the first magnetorheological adjustment component 2.

[0061] The common point in both of these cases is that the MRE in contact with the compression ring 12 will undergo torsional and compressive deformation.

[0062] In specific implementation, to enable the first magnetorheological adjustment component 2 to adjust damping and stiffness, this embodiment further designs the first magnetorheological adjustment component 2. The first magnetorheological adjustment component 2 includes an annular magnetically conductive block 21, a first sleeve 22, a first coil 23, and an annular magnetorheological elastomer 24. The first coil 23 is used to generate a magnetic field to change the mechanical properties of the annular magnetorheological elastomer 24, thereby achieving the purpose of changing damping and stiffness. At this time, the annular magnetorheological elastomer 24 is in a shear-compression hybrid mode. The annular magnetorheological elastomer 24 is placed horizontally and in full contact with the compression ring 12, utilizing the viscoelastic properties of the elastomer as a damping adjustable element. Because the annular magnetorheological elastomer 24 is placed horizontally, it will not undergo axial displacement due to friction and gravity during long-term use.

[0063] Specifically, the annular magnetically conductive block 21 is installed inside the housing 5. The annular magnetically conductive block 21, the housing 5, the end cap 6, the pressure ring 12, and the annular magnetorheological elastomer 24 form a first annular cavity. The end cap 6, the pressure ring 12, the annular magnetorheological elastomer 24, and the annular magnetically conductive block 21 abut against each other in sequence. In specific implementation, during installation, there should be a certain pre-pressure between the annular magnetorheological elastomer 24 and the pressure ring 12. The first sleeve 22 is located inside the first annular cavity, and the first coil 23 is sleeved on the first sleeve 22. The end cap 6, the housing 5, the annular magnetically conductive block 21, and the pressure ring 12 are all made of magnetically conductive material. That is, a closed first magnetic circuit 25 is formed from the inner hole of the first coil 23 to the outer side.

[0064] In the first magnetic circuit, when the pressure rod 11 is subjected to axial load, it moves downward, causing the pressure ring 21 to rotate significantly or slightly. The annular magnetorheological elastomer 24 is simultaneously subjected to compressive and shear forces, operating in a shear-compression hybrid mode. After the first coil 23 receives an external current input, it generates a magnetic field inside and near its exterior. The magnetic permeability of the magnetically conductive material is good, concentrating the magnetic field onto the first magnetic circuit 25. Changing the magnitude of the input current, i.e., changing the current flowing through the first coil 23, will change the magnitude of the magnetic induction intensity of the first magnetic circuit 25, and simultaneously change the elastic modulus and shear modulus of the annular magnetorheological elastomer 24. The dry friction and shear force between the annular magnetorheological elastomer 24 and the flange of the pressure ring 12 provide Coulomb damping force, thereby realizing the variable damping function of the vibration damper.

[0065] To facilitate the installation of the elastic adjustment component 3, a limiting ring 51 is provided inside the housing 5. The main function of the limiting ring 51 is to facilitate the arrangement of the elastic adjustment component 3 and the second magnetorheological adjustment component 4. The elastic adjustment component 3 is installed between the limiting ring 51 and the first magnetorheological adjustment component 2. The second magnetorheological adjustment component 4 is installed between the limiting ring 51 and the base 7.

[0066] The elastic adjustment assembly 3 includes a top plate 31, an elastic element 32, and a base plate 33. Specifically, the two ends of the elastic element 32 abut against the top plate 31 and the base plate 33 respectively, and the top plate 31 abuts against the connecting assembly 1; the second magnetorheological adjustment assembly 4 can pass through the limiting ring 51 and abut against the base plate 33. The function of the elastic adjustment assembly 3 is to provide basic stiffness: it can be used as a semi-active vibration damper when the coil is energized; and as a passive vibration damper when the coil is not energized; in addition, it can also serve as a protective device. In specific implementations, the elastic element 32 can be a helical spring.

[0067] In practical implementation, for ease of installation, the elastic adjustment assembly 3 further includes a second sleeve 34. The second sleeve 34 is installed inside the housing 5, with one end abutting against the limiting ring 51 and the other end abutting against the first magnetorheological adjustment assembly 2. The top plate 31 and the bottom plate 33 are slidably connected to the second sleeve 34. When installing the elastic adjustment assembly 3, first, the second sleeve 34 is placed into the housing 5, with its lower end abutting against the limiting ring 51. Then, the bottom plate 33 is slidably installed inside the second sleeve 34. Then, the elastic element 32 and the top plate 31 are installed in sequence. Then, the annular magnetic guide block 21, the first sleeve 22 and the first coil, the annular magnetorheological elastomer 24, the connecting assembly 1, and the end cap 6 are installed.

[0068] In specific implementation, this embodiment features a detailed design for the second magnetorheological adjustment component 4. Specifically, the second magnetorheological adjustment component 4 includes a magnetic post 41, a circular metal sheet 42, a circular magnetorheological elastomer 43, and a second coil 44. In specific implementation, there are at least two circular metal sheets 42 and at least three circular magnetorheological elastomers 43. The circular metal sheets 42 and the circular magnetorheological elastomers 43 are alternately stacked and located between the magnetic post 41 and the base 7. The magnetic post 41 passes through the inner hole of the limiting ring 51 and abuts against the base plate 33. The second coil 44 is located between the limiting ring 51 and the base 7 and is sleeved on the outer periphery of the circular metal sheets 42 and the circular magnetorheological elastomers 43.

[0069] In practical implementation, as the pressure rod 11 moves downward, the elastic element 32 is compressed. The elastic force, after transmission, causes the lower circular magnetorheological elastomer 43 to be subjected to compression, entering a compression working mode. When the input current of the second coil 44 changes, the magnetic induction intensity of the second coil 44 also changes, and the elastic modulus of the circular magnetorheological elastomer 43 changes accordingly. Simultaneously, the circular magnetorheological elastomer 43, the elastic element 32, and the circular magnetorheological elastomer 43 in the second magnetic circuit 46 constitute the main part of the variable stiffness mechanism of the vibration damper, thereby realizing the variable stiffness function of the vibration damper. When the pressure rod 11 moves downward to its lowest position...

[0070] Table 1. Material Reference Table for Various Components of the Vibration Damper

[0071]

[0072] At this point, the elastic force of the elastic element 32 causes it to return upward.

[0073] In a specific implementation, in order to facilitate the winding of the second coil 44, the second magnetorheological adjustment component 4 in this embodiment further includes a third sleeve 45, which is sleeved on the outer periphery of the magnetic post 41, the circular metal sheet 42 and the circular magnetorheological elastomer 43; the second coil 44 is wound on the outer periphery of the third sleeve 45.

[0074] In specific implementation, in order to form a closed second magnetic circuit 46 around the second coil 44, in this embodiment, the base 7, the circular metal sheet 42, and the magnetic guide post 41 are all made of magnetically conductive material. Specifically, in this embodiment, the reference table of materials for each component of the vibration damper is shown in Table 1.

[0075] In a specific implementation, the housing 5 is provided with wire holes 52 for wires to pass through. Specifically, there are two wire holes 52, one located near the end cap 6 and the other near the base 7. The two wire holes 52 are used for wires connecting the first coil 23 and the second coil 44 to pass through, respectively.

[0076] Example 2

[0077] This embodiment is a further improvement based on Embodiment 1. The similarities will not be repeated here, and only the differences will be explained below.

[0078] The main difference between this embodiment and Embodiment 1 lies in the arrangement of the connecting component 1. For example, the threaded connection between the pressure rod and the pressure ring 12 can be replaced with any structure that can convert linear movement into rotation. For instance, a groove can be provided along the inner wall of the pressure ring 12, and a slider that slides in cooperation with the groove can be provided on the outer periphery of the pressure rod 11. By axially moving the pressure rod 11, the rotation of the pressure ring 12 is achieved, thereby putting the corresponding annular magnetorheological elastomer 24 into a shear-extrusion working mode.

[0079] Based on the above ideas, the connecting component 1 can be a sliding screw pair, rolling screw pair, gear rack, or other structures with trapezoidal threads. In short, any mechanism that can convert reciprocating linear motion into rotational motion is acceptable.

[0080] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A magnetorheological elastomer based vibration damping device, characterized by: The damping device comprises a connecting assembly (1), a first magneto-rheological adjusting assembly (2), an elastic adjusting assembly (3) and a second magneto-rheological adjusting assembly (4); The connecting assembly (1) is connected with the first magneto-rheological adjusting assembly (2), and the elastic adjusting assembly (3) is connected with the connecting assembly (1) and the second magneto-rheological adjusting assembly (4) respectively; The connecting assembly (1) can convert part of the load received into pressure and torque and transmit the pressure to the first magneto-rheological adjusting assembly (2), and transmit the remaining pressure to the second magneto-rheological adjusting assembly (4) through the elastic adjusting assembly (3); The first magneto-rheological adjusting assembly (2) is used for adjusting the stiffness and damping of the damping device, and the second magneto-rheological adjusting assembly (4) is used for adjusting the stiffness of the damping device; The damping device further comprises a shell (5); The shell (5) is cylindrical; The connecting assembly (1), the first magneto-rheological adjusting assembly (2), the elastic adjusting assembly (3) and the second magneto-rheological adjusting assembly (4) are sequentially arranged along the axial direction of the shell (5), and the connecting assembly (1) can pass through the first magneto-rheological adjusting assembly (2) and be connected with the elastic adjusting assembly (3); The damping device further comprises an end cover (6) and a base (7); The end cover (6) and the base (7) are respectively arranged at two ends of the shell (5); the connecting assembly (1) comprises a pressure bearing rod (11) and a pressure receiving ring (12); The pressure receiving ring (12) is located between the first magneto-rheological adjusting assembly (2) and the end cover (6); the pressure bearing rod (11) passes through the first magneto-rheological adjusting assembly (2) and abuts against the elastic adjusting assembly (3); The pressure bearing rod (11) passes through the pressure receiving ring (12), and the pressure bearing rod (11) and the pressure receiving ring (12) are connected through threads or inclined grooves, so as to convert the axial force received by the pressure bearing rod (11) into axial force and torque; The first magneto-rheological adjusting assembly (2) comprises a ring-shaped magnetic conducting block (21), a first sleeve (22), a first coil (23) and a ring-shaped magneto-rheological elastomer (24), The ring-shaped magnetic conducting block (21) is arranged in the shell (5), the ring-shaped magnetic conducting block (21), the shell (5), the end cover (6), the pressure receiving ring (12) and the ring-shaped magneto-rheological elastomer (24) form a first annular cavity, and the end cover (6), the pressure receiving ring (12), the ring-shaped magneto-rheological elastomer (24) and the ring-shaped magnetic conducting block (21) abut against each other in sequence; The first sleeve (22) is located in the first annular cavity, and the first coil (23) is sleeved on the first sleeve (22); The end cover (6), the shell (5), the ring-shaped magnetic conducting block (21) and the pressure receiving ring (12) are all made of magnetic conducting material.

2. The magnetorheological elastomer-based vibration damping device of claim 1, wherein: A limiting ring (51) is arranged in the shell (5); the elastic adjusting assembly (3) is arranged between the limiting ring (51) and the first magneto-rheological adjusting assembly (2); The elastic adjusting assembly (3) comprises a top disc (31), an elastic element (32) and a bottom plate (33). Two ends of the elastic element (32) are respectively abutted against the top disc (31) and the bottom plate (33), and the top disc (31) is in abutment with the connecting assembly (1); The second magneto-rheological adjusting assembly (4) can pass through the limiting ring (51) and is in abutment with the bottom plate (33).

3. The magnetorheological elastomer-based vibration damping device of claim 2, wherein: The elastic adjusting assembly (3) further comprises a second sleeve (34), the second sleeve (34) is installed in the shell (5), and one end of the second sleeve (34) is abutted against the limiting ring (51) and the other end is abutted against the first magneto-rheological adjusting assembly (2); The top disc (31) and the bottom plate (33) are in sliding connection with the second sleeve (34).

4. The magnetorheological elastomer-based vibration damping device of claim 2, wherein: The second magneto-rheological adjusting assembly (4) comprises a magnetic conducting column (41), a circular metal sheet (42), a circular magneto-rheological elastomer (43) and a second coil (44); The circular metal sheet (42) and the circular magneto-rheological elastomer (43) are alternately stacked and located between the magnetic conducting column (41) and the base (7); the magnetic conducting column (41) passes through the inner hole of the limiting ring (51) and is in abutment with the bottom plate (33); The second coil (44) is located between the limiting ring (51) and the base (7) and is sleeved on the outer periphery of the circular metal sheet (42) and the circular magneto-rheological elastomer (43).

5. The magnetorheological elastomer-based vibration damping device of claim 4, wherein: The second magneto-rheological adjusting assembly (4) further comprises a third sleeve (45), the third sleeve (45) is sleeved on the outer periphery of the magnetic conducting column (41), the circular metal sheet (42) and the circular magneto-rheological elastomer (43); The second coil (44) is wound on the outer periphery of the third sleeve (45).

6. The magnetorheological elastomer-based vibration damping device of claim 4, wherein: The base (7), the circular metal sheet (42) and the magnetic conducting column (41) are all made of magnetic conducting material.

7. The magnetorheological elastomer-based vibration damping device according to any one of claims 1 to 6, characterized in that: The shell (5) is provided with a wire hole (52) for passing through a wire.

Images