Shear extrusion vibration isolation device

Abstract

This invention discloses a shear-compression type vibration damping and isolation device, belonging to the field of vibration reduction technology. The key technical features include a movable mechanism and a non-movable mechanism. The movable mechanism comprises a central inner shaft, a central outer shaft fixedly sleeved on the central inner shaft, multiple first excitation coils arranged in a ring array within the sidewall of the central outer shaft, and multiple inner magnetic yokes arranged in a ring array fixedly installed on the outer sidewall of the central outer shaft. Each first excitation coil and each inner magnetic yoke are alternately spaced, with the inner magnetic yokes protruding radially outward along the central outer shaft. A first excitation coil is positioned between every two inner magnetic yokes. This shear-compression type vibration damping and isolation device is suitable for vibration damping and isolation of hinged joints, providing significant damping force even in limited space. It exhibits good vibration damping and isolation performance, a lightweight structure, and meets weight reduction requirements.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, specifically to a shear-compression type vibration damping and isolation device. Background Technology

[0002] Currently, magnetorheological materials are widely used in vibration damping and isolation devices, achieving excellent vibration reduction effects. Magnetorheological materials are intelligent materials that operate under a magnetic field. During operation, their rheological properties can undergo rapid (response time on the millisecond scale), continuous, and reversible changes (returning to the initial state after the magnetic field is removed), thus attracting significant attention in numerous fields. The most researched magnetorheological materials are magnetorheological fluids and magnetorheological elastomers. Magnetorheological fluids are suspensions of solid microparticles in a base fluid, mainly composed of a carrier fluid, magnetorheologically responsive particles, and surfactants. It is a controllable fluid that, under the influence of a strong magnetic field, can transform from a well-flowing Newtonian fluid to a non-Newtonian fluid within milliseconds, and this change is continuous, reversible, and easily and rapidly controlled. Many magnetorheological devices are designed based on the properties of magnetorheological fluids. They all possess excellent characteristics such as fast response speed, simple structure, and low energy consumption, and have broad application prospects in engineering fields. Magnetorheological transmission mechanisms are an important aspect of magnetorheological technology applications. Magnetorheological elastomers (MLEs) can alter their storage modulus and loss modulus under the influence of a magnetic field, thus changing the stiffness and damping of the structure. Furthermore, MLEs are already solidified before operation, eliminating the problem of ferromagnetic particle settling and requiring no sealing, making them widely used in dampers. For some articulated structures, vibration damping and buffering capabilities during rotational movement are also necessary, such as in medical devices and bionic artificial joints. MLEs are also used for vibration damping and isolation at articulated joints. Currently, MLEs used in articulated joints primarily operate in a single shear mode. However, the vibration damping performance of single-shear mode MLEs for vibration damping and isolation joints needs improvement, making it difficult to provide large damping forces in space-constrained situations. This results in larger device sizes, making it difficult to meet lightweight requirements. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide a shear-compression type vibration reduction and isolation device. This shear-compression type vibration reduction and isolation device is suitable for vibration reduction and isolation of hinged nodes, can provide a large damping force under limited space, has good vibration reduction and isolation performance, and has a lightweight structure, meeting the requirements of lightweighting.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a shearing and extrusion type vibration damping and isolation device, comprising a movable mechanism and a non-movable mechanism; the movable mechanism includes a central inner shaft, a central outer shaft fixedly sleeved on the central inner shaft, a plurality of first excitation coils embedded in the side wall of the central outer shaft in a ring array, and a plurality of inner magnetic yokes fixedly installed in a ring array on the outer side wall of the central outer shaft, wherein each first excitation coil and each inner magnetic yoke are alternately spaced, and the inner magnetic yokes protrude radially outward along the central outer shaft, with a first excitation coil provided between every two inner magnetic yokes; the non-movable mechanism includes an outer cylinder, end caps sealing both ends of the outer cylinder, and a plurality of outer magnetic yokes fixedly installed in a ring array on the inner side wall of the outer cylinder. The outer magnetic yoke comprises a yoke and a second excitation coil embedded on both sides of each outer magnetic yoke, the outer magnetic yoke protruding radially inward along the outer cylinder; the central inner shaft passes through both end caps and is rotatably located at the axis of the outer cylinder, the central outer shaft is located inside the outer cylinder, each inner magnetic yoke and each outer magnetic yoke are staggered, the inner magnetic yoke can move within the range between its two adjacent outer magnetic yokes as the central inner shaft rotates, the side of the inner magnetic yoke away from the central outer shaft is located between the two second excitation coils, and the side of the outer magnetic yoke closer to the central outer shaft corresponds to the position of the first excitation coil; inside the outer cylinder, there is a gap between the movable mechanism and the non-movable mechanism, the gap being filled with magnetorheological fluid.

[0005] In some embodiments, the outer cylinder is provided with multiple partitions, which, together with the two end caps, divide the outer cylinder into multiple independent cavities. The central inner shaft moves through each partition, and the central outer shaft is divided into multiple segments by the partitions. Each segment of the central outer shaft is disposed in each cavity. Furthermore, each of the first excitation coils, the inner yoke, the outer yoke, and the second excitation coils is also divided into multiple groups and disposed in each cavity.

[0006] In some embodiments, the outer cylinder is detachably connected to the end cap.

[0007] In some embodiments, a gap is left between the central outer shaft and the end cap.

[0008] In some embodiments, the central inner shaft is positioned and rotatably connected to the end cap via a bearing.

[0009] In some embodiments, a sealing gasket is provided at the connection between the central inner shaft and the end cap.

[0010] In summary, the present invention has the following beneficial effects:

[0011] This shear-compression type vibration damping and isolation device includes a first excitation coil and an inner magnetic yoke in its rotating mechanism, and a second excitation coil and an outer magnetic yoke in its non-rotating mechanism. The inner and outer magnetic yokes are staggered, and the inner magnetic yoke can move within the range between its two adjacent outer magnetic yokes as the central inner shaft rotates. The side of the inner magnetic yoke furthest from the central outer shaft is located between the two second excitation coils, while the side of the outer magnetic yoke closest to the central outer shaft corresponds to the position of the first excitation coil. When the excitation coil is energized and magnetized, it causes a change in the viscosity of the nearby magnetorheological fluid, generating a damping force. Thus, when the rotating mechanism rotates, the inner and outer magnetic yokes simultaneously shear and compress the magnetorheological fluid, generating a significant damping force. This shear-compression type vibration damping and isolation device is suitable for vibration damping and isolation of hinged joints, providing a large damping force even in limited space. It exhibits good vibration damping and isolation performance, a lightweight structure, and meets weight reduction requirements. Attached Figure Description

[0012] Figure 1 This is an overall structural diagram of the present invention;

[0013] Figure 2 This is an overall structural diagram of the active mechanism of the present invention;

[0014] Figure 3 This is an overall structural diagram of the inactive mechanism of the present invention (with the end cap at one end removed);

[0015] Figure 4 for Figure 1 Cross-sectional view at point AA;

[0016] Figure 5 for Figure 1 Cross-sectional view at BB.

[0017] In the diagram: 1. Inner central shaft; 2. Outer central shaft; 3. First excitation coil; 4. Inner magnetic yoke; 5. Outer cylinder; 6. End cap; 7. Partition plate; 8. Outer magnetic yoke; 9. Second excitation coil; 10. Magnetorheological fluid; 11. Bearing; 12. Sealing gasket. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] like Figure 1-3 As shown, a shear-compression type vibration damping and isolation device includes a movable mechanism and a non-movable mechanism. It should be noted that the terms "movable" and "non-movable" in this name are relative and do not represent their absolute state in actual use. They are only used to distinguish between the two mechanisms.

[0023] like Figure 2As shown, the movable mechanism includes a central inner shaft 1, a central outer shaft 2 fixedly sleeved on the central inner shaft 1, a plurality of first excitation coils 3 embedded in the side wall of the central outer shaft 2 in a ring array, and a plurality of inner magnetic yokes 4 fixedly installed in a ring array on the outer side wall of the central outer shaft 2. The central inner shaft 1 and the central outer shaft 2 are preferably coaxial. The two ends of the central inner shaft 1 protrude axially beyond the two ends of the central outer shaft 2. The shaft formed by the central inner shaft 1 and the central outer shaft 2 is preferably symmetrical at both ends. Each first excitation coil 3 and each inner magnetic yoke 4 are alternately arranged. The inner magnetic yoke 4 protrudes outward along the radial direction of the central outer shaft 2. A first excitation coil 3 is provided between every two inner magnetic yokes 4. In each ring array, the number of inner magnetic yokes 4 can be set to six, and the number of first excitation coils 3 can be set to twelve. In some embodiments, two first excitation coils 3 can be provided between every two inner magnetic yokes 4.

[0024] like Figure 3 As shown, the non-moving mechanism includes an outer cylinder 5, end caps 6 sealing both ends of the outer cylinder 5, multiple outer magnetic yokes 8 fixedly installed in a ring array on the inner side wall of the outer cylinder 5, and second excitation coils 9 embedded in both sides of each outer magnetic yoke 8. The outer cylinder 5 and the end caps 6 are preferably detachably connected to facilitate maintenance. The outer magnetic yokes 8 protrude inward along the radial direction of the outer cylinder 5. In each ring array, the number of outer magnetic yokes 8 can be set to six, and the number of second excitation coils 9 can be set to twelve. In addition, a gap can be left between the central outer shaft 2 and the end caps 6 to avoid unnecessary wear.

[0025] like Figure 4 and Figure 5 As shown, the central inner shaft 1 passes through both end caps 6 and is rotatably mounted at the axis of the outer cylinder 5. The central inner shaft 1 is positioned and installed, and it cannot move axially but can rotate. The central inner shaft 1 can be positioned and rotatably connected to the end caps 6 through the bearing 11. In order to improve the sealing performance of the device, a sealing gasket 12 can be set at the connection between the central inner shaft 1 and the end caps 6. The central outer shaft 2 is located inside the outer cylinder 5. Each inner magnetic yoke 4 and each outer magnetic yoke 8 are staggered. The inner magnetic yoke 4 can move within the range between its two adjacent outer magnetic yokes 8 as the central inner shaft 1 rotates. The side of the inner magnetic yoke 4 away from the central outer shaft 2 has an arc-shaped convex surface and this side is located between the two second excitation coils 9. The side of the outer magnetic yoke 8 close to the central outer shaft 2 can have an arc-shaped concave surface and this side corresponds to the position of the first excitation coil 3.

[0026] like Figure 4As shown, there is a gap between the moving mechanism and the non-moving mechanism inside the outer cylinder 5. The gap is filled with magnetorheological fluid 10. When the first excitation coil 3 and the second excitation coil 9 are energized, the magnetorheological fluid 10 will change from a Newtonian fluid state to a high-viscosity, low-flow non-Newtonian fluid state. It will have huge motion damping, and the closer to the excitation coil, the greater the motion damping. The first excitation coil 3 and the second excitation coil 9 are respectively distributed near the end and on both sides of the outer magnetic yoke 8, so that the magnetorheological fluid 10 around the outer magnetic yoke 8 can be transformed into a non-Newtonian fluid state. The magnetic field strength generated by the excitation coil can be adjusted by adjusting the intensity of the excitation current, thereby adjusting the damping intensity of the magnetorheological fluid 10 to meet the needs of different application scenarios.

[0027] like Figure 5 As shown, when the first excitation coil 3 and the second excitation coil 9 are energized, once an external force rotates the inner shaft 1, the inner magnetic yoke 4 and the outer magnetic yoke 8 will approach each other, thereby squeezing the magnetorheological fluid 10, which has been transformed into a non-Newtonian fluid state. At the same time, the side of the inner magnetic yoke 4 away from the outer shaft 2 and the side of the outer magnetic yoke 8 close to the outer shaft 2 will simultaneously shear the magnetorheological fluid 10. The shearing part is located in the area where the motion damping of the magnetorheological fluid 10 is the greatest, thereby generating a greater shear resistance. Thus, under the combined action of shear resistance and squeezing resistance, a good vibration reduction and isolation effect is achieved.

[0028] In summary, after the excitation coil of this shear-squeeze type vibration damping and isolation device is energized and magnetized, it can cause a change in the viscosity of the magnetorheological fluid 10 nearby and generate a damping force. Thus, when the rotating mechanism rotates, the inner magnetic yoke 4 and the outer magnetic yoke 8 will simultaneously shear and squeeze the magnetorheological fluid 10, thereby generating a huge damping force. This shear-squeeze type vibration damping and isolation device is suitable for vibration damping and isolation of hinged nodes. It can provide a large damping force in the case of limited space, has good vibration damping and isolation performance, and has a lightweight structure, meeting the requirements of lightweighting.

[0029] In some embodiments, such as Figure 3 and 4 As shown, multiple baffles 7, such as two, can be installed inside the outer cylinder 5. The two baffles 7, together with the two end caps 6, can divide the outer cylinder 5 into three independent cavities. The central inner shaft 1 moves through each baffle 7, and the central outer shaft 2 is divided into three sections by the baffles 7. The three sections of the central outer shaft 2 are set in each cavity and a gap is left between them and the inner wall of the cavity. The first excitation coil 3, the inner magnetic yoke 4, the outer magnetic yoke 8, and the second excitation coil 9 are also divided into three groups and set in each cavity. In this way, the magnetorheological fluid 10 is partitioned, thereby realizing partition management and partition maintenance, which helps to reduce maintenance costs and the cost of replacing parts. Moreover, more precise damping control and adjustment can also be performed.

[0030] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A shear-extrusion vibration isolation and isolation device, characterized in that: comprising a movable mechanism and a non-movable mechanism; the movable mechanism comprises a center inner shaft (1), a center outer shaft (2) fixedly sleeved on the center inner shaft (1), a plurality of first excitation coils (3) arranged in an annular array in the side wall of the center outer shaft (2), and a plurality of inner magnetic yokes (4) fixedly installed on the outer side wall of the center outer shaft (2) in an annular array, each first excitation coil (3) and each inner magnetic yoke (4) are alternately and spacedly arranged, the inner magnetic yoke (4) protrudes outward along the radial direction of the center outer shaft (2), and the first excitation coil (3) is arranged between every two inner magnetic yokes (4); the non-movable mechanism comprises an outer cylinder (5), end covers (6) blocking both ends of the outer cylinder (5), a plurality of outer magnetic yokes (8) fixedly installed on the inner side wall of the outer cylinder (5) in an annular array, and second excitation coils (9) embedded on both sides of each outer magnetic yoke (8), the outer magnetic yoke (8) protrudes inward along the radial direction of the outer cylinder (5); the center inner shaft (1) penetrates through both end covers (6) and is rotatably arranged at the axis of the outer cylinder (5), the center outer shaft (2) is located in the outer cylinder (5), each inner magnetic yoke (4) and each outer magnetic yoke (8) are alternately arranged, the inner magnetic yoke (4) can move in the range between two adjacent outer magnetic yokes (8) with the rotation of the center inner shaft (1), the side of the inner magnetic yoke (4) away from the center outer shaft (2) is located between two second excitation coils (9), and the side of the outer magnetic yoke (8) close to the center outer shaft (2) corresponds to the position of the first excitation coil (3); a gap is left between the movable mechanism and the non-movable mechanism in the outer cylinder (5), and the gap is filled with a magnetorheological fluid (10); a plurality of partitions (7) are arranged in the outer cylinder (5), the outer cylinder (5) is divided into a plurality of independent cavities by the plurality of partitions (7) and the two end covers (6), the center inner shaft (1) penetrates through each partition (7), the center outer shaft (2) is divided into multiple sections by the partitions (7), each section of the center outer shaft (2) is arranged in each cavity, and each first excitation coil (3), inner magnetic yoke (4), outer magnetic yoke (8) and second excitation coil (9) are also divided into multiple groups and arranged in each cavity. The outer cylinder (5) and the end cover (6) are detachably connected. A gap is left between the center outer shaft (2) and the end cover (6). The center inner shaft (1) is positioned and rotatably connected with the end cover (6) through a bearing (11). A sealing gasket (12) is arranged at the connection between the center inner shaft (1) and the end cover (6). ​ ​ 2. A shear extrusion vibration isolation / separation device according to claim 1, characterized in that: ​ 3. A shear-bushing vibration isolation device according to claim 1, characterized in that: ​ 4. A shear extrusion vibration isolation and / or decoupling device according to claim 1, wherein: ​ 5. A shear extrusion vibration isolation and / or decoupling device according to claim 1, wherein: ​

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