An energy-feeding magnetorheological elastomer shock absorber for engine suspension

Abstract

This invention discloses an energy-feeding magnetorheological elastomer (MREE) vibration damper for engine mounts, comprising a housing, an excitation coil assembly, a magnet, a MREE, a magnetically conductive block, and an iron core. In this invention, the magnet and the excitation coil jointly participate in the power generation process. The magnet provides a magnetic field, and when the excitation coil moves within the magnetic field, it generates current through electromagnetic induction, thereby achieving power generation. When the excitation coil is energized, the magnetorheological effect causes the MREE to change its properties, making it more rigid. Because the magnetic field strength passing through the MREE varies with the magnitude of the current, the damping effect of the MREE also changes with the current. Therefore, the damping effect experienced by the MREE during operation is controllable. If less current is needed, it can be stored in an energy storage capacitor via leads, achieving energy feeding.

Description

Technical Field

[0001] This invention relates to a vibration damper, specifically an energy-feeding magnetorheological elastomer vibration damper for engine mounts, belonging to the technical field of vibration damping equipment. Background Technology

[0002] Generally speaking, the engine is an internal source of vibration, and it is also subject to various external vibrations, which can cause damage to components and ride discomfort. Therefore, the suspension system is designed to minimize the vibration transmitted from the engine to the support system.

[0003] Magnetorheological elastomers (MEAs) are novel smart materials with high-tech characteristics such as controllability, reversibility, and rapid response. They possess adjustable damping capabilities, enabling them to quickly react to impact loads and absorb energy. They also exhibit excellent stability, making MEA support systems widely used in automobiles, building structures, and industrial equipment to provide effective vibration reduction and isolation. This material has broad application prospects not only in vibration reduction and noise reduction for vehicles such as automobiles, trains, and ships, but also in fundamental fields such as aerospace, defense, and transportation.

[0004] In the prior art, a damping adjustable engine suspension vibration reduction device disclosed in patent CN101285514A includes a main spring assembly and a base assembly. The main spring assembly and the base assembly form a sealed cavity. A vibration isolation mechanism with an upper liquid chamber and a lower liquid chamber is provided in the cavity. The vibration isolation mechanism includes a pair of electrode assemblies that can be connected to a power source. An inertial channel body is fixed in the cavity. A channel is opened in the center of the inertial channel body. The electrode assembly fixes the inner core of the channel body in the channel and forms a liquid passage connecting the upper liquid chamber and the lower liquid chamber with electrorheological fluid between the inertial channel body and the inner core of the channel body. When the engine vibrates, the resulting excitation force, directed downwards, is transmitted to the suspended elastic spring via the connecting bolts. The elastic spring deforms under this force, compressing the upper fluid chamber. The reduced volume and increased pressure in the upper chamber create a pressure difference with the lower chamber. This pressure forces the electrorheological fluid from the upper chamber down to the lower chamber via an inertial channel. As the electrorheological fluid flows through the vibration isolation mechanism's fluid passage, the viscosity of the toroidal electrorheological fluid is altered by controlling the power supply voltage, thus changing its damping and dissipating some vibration energy, attenuating the engine's excitation force. The electrorheological fluid flows into the lower chamber, increasing its pressure. This pressure deforms the bottom diaphragm, increasing the lower chamber's volume and expelling air between the lower chamber and the base through vents on the base. The electrorheological fluid continues to flow from the upper chamber to the lower chamber until pressure equilibrium is reached. The undiminished force is transmitted to the base by the rubber main spring, and then to the frame by the connecting bolts. Although existing technology can achieve damping-adjustable vibration reduction by changing the viscosity of the electrorheological fluid by changing the electric field strength of the toroidal liquid, thereby changing the damping of the electrorheological liquid, some electrical energy will be lost when adjusting the electric field strength by changing the power supply, which will result in a large amount of energy waste. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-feeding magnetorheological elastomer damper for engine mounts in order to solve at least one of the above-mentioned technical problems.

[0006] The present invention achieves the above objectives through the following technical solution: an energy-feeding magnetorheological elastomer vibration damper for engine mounts, comprising a housing, an excitation coil assembly, a magnet, a magnetorheological elastomer, a magnetic conductive block, and an iron core, wherein the excitation coil assembly, the magnet, the magnetorheological elastomer, and the iron core are all disposed within the housing;

[0007] The excitation coil assembly is attached to the inner wall of the housing. The magnetorheological elastomer and the magnetic block are stacked in the center of the housing. The iron core is located directly above the magnetorheological elastomer, and the magnet is installed on the outer peripheral side wall of the iron core.

[0008] As a further embodiment of the present invention: the outer shell is composed of a cylindrical shell and a disc base, the cylindrical shell is integrally connected to the upper end of the disc base, and the outer periphery of the disc base is provided with a number of threaded holes.

[0009] As a further embodiment of the present invention: a top cover is connected to the top opening of the outer shell, and a bolt is threaded through the center of the top cover. A threaded hole is opened at the center of the top of the iron core, and one end of the bolt located inside the outer shell is threadedly fixed to the iron core.

[0010] As a further aspect of the present invention: the excitation coil assembly includes a first excitation coil and a second excitation coil, and a magnetic shielding plate is provided between the first excitation coil and the second excitation coil.

[0011] As a further embodiment of the present invention: three magnetorheological elastomers are provided, and the magnetorheological elastomers and magnetic conductive blocks are stacked in the center of the base inside the outer shell, with the magnetorheological elastomers located directly below the iron core. The material of the magnetorheological elastomers includes, but is not limited to, silicone rubber.

[0012] As a further embodiment of the present invention: two magnetic conductive blocks are provided, and the magnetic conductive blocks are sequentially placed between two adjacent magnetorheological elastomers.

[0013] As a further embodiment of the present invention: an energy storage capacitor is provided on the outer side of the housing, and a lead wire is connected to the energy input terminal of the energy storage capacitor. The other end of the lead wire passes through the side wall of the housing and is electrically connected to the second excitation coil.

[0014] The beneficial effects of this invention are:

[0015] 1) An energy feeding device is adopted, and an excitation coil is placed inside the shell. The first excitation coil and the second excitation coil are separated by a magnetic shielding plate. A magnet is installed at the iron core above the magnetic shielding plate. When vibration occurs, this structure generates current. When the excitation coil is energized, the magnetorheological effect causes the magnetorheological elastomer to change its properties and become more rigid. Because the magnetic field strength passing through the magnetorheological elastomer varies with the magnitude of the current, the damping effect of the magnetorheological elastomer also changes with the change of current. Therefore, the damping effect experienced by the magnetorheological elastomer during operation is controllable.

[0016] 2) The energy feeding device can realize the effective use of current. The energy storage capacitor is connected to the energy feeding device through the lead wire. When necessary, the current is released. The magnetic field strength is changed by the magnitude of the input current, thereby changing the performance of the magnetorheological elastomer and achieving the optimal effect of engine mount vibration reduction. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure viewed from below in an embodiment of the present invention;

[0019] Figure 3This is a top view of the structure in an embodiment of the present invention;

[0020] Figure 4 This is a three-dimensional schematic diagram of an embodiment of the present invention.

[0021] In the diagram: 1. Bolt, 2. Outer shell, 21. Cylindrical shell, 22. Disc base, 23. Threaded hole, 3. Top cover, 4. Magnetic shielding plate, 5. First excitation coil, 6. Second excitation coil, 7. Magnet, 8. Magnetorheological elastomer, 9. Magnetic block, 10. Iron core, 11. Lead wire, 12. Energy storage capacitor. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, as Figures 1 to 4 As shown, an energy-feeding magnetorheological elastomer vibration damper for engine mounting includes a housing 2, an excitation coil assembly, a magnet 7, a magnetorheological elastomer 8, a magnetic conductive block 9, and an iron core 10. The excitation coil assembly, the magnet 7, the magnetorheological elastomer 8, and the iron core 10 are all disposed inside the housing 2.

[0024] The excitation coil assembly is closely attached to the inner wall of the outer casing 2. The magnetorheological elastomer 8 and the magnetic block 9 are stacked in the center of the inner casing 2. The iron core 10 is located directly above the magnetorheological elastomer 8. The magnet 7 is installed on the outer peripheral side wall of the iron core 10. The magnetic field is provided by the magnet 7. When the excitation coil assembly moves in the magnetic field, it generates current through electromagnetic induction, thereby realizing power generation. When the excitation coil assembly is energized, the magnetorheological effect causes the magnetorheological elastomer 8 to change its properties and become more rigid. Because the magnetic field strength passing through the magnetorheological elastomer 8 varies with the magnitude of the current, the damping effect of the magnetorheological elastomer 8 also changes with the change of current. Therefore, the damping effect experienced by the magnetorheological elastomer 8 during operation is controllable.

[0025] Example 2: In addition to all the technical features in Example 1, this example also includes: the outer shell 2 is composed of a cylindrical shell 21 and a disc base 22. The cylindrical shell 21 is integrally connected to the upper end of the disc base 22. The outer periphery of the disc base 22 is provided with a number of threaded holes 23, which facilitates the fixed connection of the shell 2 to the car base through the threaded holes 23, so as to achieve stable support for the overall structure of the shock absorber.

[0026] A top cover 3 is connected to the top opening of the outer casing 2. A bolt 1 is threaded through the center of the top cover 3. A threaded hole is opened at the center of the top of the iron core 10. One end of the bolt 1 inside the outer casing 2 is threadedly fixed to the iron core 10, so that the outer casing 2 and the iron core 10 can be fixedly connected by the action of the bolt 1. The bolt 1 located above the outer casing 2 can also be fixedly connected to the car engine. The iron core 10 can also provide support; limit the diffusion of the magnetic field, reduce energy loss, and thus maintain the efficiency and stability of the electromagnet; change the direction of the magnetic field, making the magnetic field more stable and stronger, thereby improving the efficiency of the electromagnet; limit the diffusion of the magnetic field, reduce energy loss, and thus maintain the efficiency and stability of the electromagnet.

[0027] The excitation coil assembly includes a first excitation coil 5 and a second excitation coil 6. A magnetic shielding plate 4 is provided between the first excitation coil 5 and the second excitation coil 6. The magnetic shielding plate 4 separates the two excitation coils, thereby ensuring that the magnetic fields generated by the two excitation coils do not affect each other, and realizing independent control of the two excitation coils.

[0028] Example 3: In addition to all the technical features in Example 1, this example also includes: three magnetorheological elastomers 8 are provided. The magnetorheological elastomers 8 and the magnetic conductive block 9 are stacked in the center of the base inside the outer shell 2, and the magnetorheological elastomers 8 are located directly below the iron core 10. The material of the magnetorheological elastomers 8 includes, but is not limited to, silicone rubber. When the excitation coil is energized, the magnetorheological effect causes the magnetorheological elastomers 8 to change their properties and become more rigid. Because the magnetic field strength passing through the magnetorheological elastomers 8 varies with the magnitude of the energized current, the damping effect of the magnetorheological elastomers 8 also changes with the change of current. The magnetorheological elastomers 8 can play a buffering and vibration reduction role in the vertical direction.

[0029] Two magnetic conductive blocks 9 are provided. The magnetic conductive blocks 9 are sequentially placed between two adjacent magnetorheological elastomers 8. The magnetic magnetic field can be concentrated around the excitation coil through the magnetic conductive blocks 9, which can enhance the electromagnetic induction effect, improve the power generation efficiency and output power, reduce magnetic leakage and energy loss, and improve energy conversion efficiency.

[0030] An energy storage capacitor 12 is provided on the outer side of the outer casing 2. The energy input terminal of the energy storage capacitor 12 is connected to a lead wire 11. The other end of the lead wire 11 passes through the side wall of the outer casing 2 and is electrically connected to the second excitation coil 6. When the second excitation coil 6 generates current through electromagnetic induction, thereby realizing power generation, if too much current is not needed, the energy can be stored in the energy storage capacitor 12 through the lead wire 11 to realize energy feeding. This is the application of the so-called energy feeding magnetorheological elastomer.

[0031] Magnet 7 and excitation coil jointly participate in the power generation process; magnet 7 provides a magnetic field, and when the excitation coil moves in the magnetic field, it generates current through electromagnetic induction, thereby realizing power generation. When the excitation coil is energized, the magnetorheological elastomer 8 changes its properties and becomes more rigid due to the magnetorheological effect. Since the magnetic field strength passing through the magnetorheological elastomer 8 varies with the magnitude of the current, the damping effect of the magnetorheological elastomer 8 also changes with the current. Therefore, the damping effect experienced by the magnetorheological elastomer 8 during operation is controllable. If too much current is not needed, it can be stored in the energy storage capacitor 12 through the lead 11 to realize energy feeding, thus realizing the application of the so-called energy-feeding magnetorheological elastomer.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetorheological elastomer damper for engine mounting, comprising a housing (2), an excitation coil assembly, a magnet (7), a magnetorheological elastomer (8), a magnetically conductive block (9), and an iron core (10), characterized in that: The excitation coil assembly, magnet (7), magnetorheological elastomer (8) and iron core (10) are all housed inside the outer casing (2); The excitation coil assembly is attached to the inner wall of the outer shell (2). The magnetorheological elastomer (8) and the magnetic block (9) are stacked in the center of the inner shell (2). The iron core (10) is located directly above the magnetorheological elastomer (8). The magnet (7) is installed on the outer peripheral side wall of the iron core (10). The outer shell (2) is composed of a cylindrical shell (21) and a disc base (22). The cylindrical shell (21) is integrally connected to the upper end of the disc base (22). The outer periphery of the disc base (22) is provided with several threaded holes (23). The top opening of the outer shell (2) is connected to a top cover (3), and a bolt (1) is threaded through the center of the top cover (3). A threaded hole is opened at the top center of the iron core (10). One end of the bolt (1) inside the outer shell (2) is threadedly fixed to the iron core (10), and one end of the bolt (1) above the outer shell (2) is fixedly connected to the car engine. The excitation coil assembly includes a first excitation coil (5) and a second excitation coil (6), and a magnetic shielding plate (4) is provided between the first excitation coil (5) and the second excitation coil (6). Three magnetorheological elastomers (8) are provided. The magnetorheological elastomers (8) and the magnetic conductive block (9) are stacked in the center of the base inside the outer shell (2). The magnetorheological elastomers (8) are located directly below the iron core (10). The material of the magnetorheological elastomers (8) includes, but is not limited to, silicone rubber. Two magnetic conductive blocks (9) are provided, and the magnetic conductive blocks (9) are sequentially placed between two adjacent magnetorheological elastomers (8); An energy storage capacitor (12) is provided on the outside of the outer shell (2). The energy input terminal of the energy storage capacitor (12) is connected to a lead wire (11). The other end of the lead wire (11) passes through the side wall of the outer shell (2) and is electrically connected to the second excitation coil (6).

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