Magnetorheological damper and magnetorheological suspension

Abstract

The invention relates to the technical field of vehicle vibration reduction, in particular to a magnetorheological damper and a magnetorheological suspension. Comprising a cylinder, a piston rod, a piston, a magnet exciting coil, a thermoelectric power generation assembly, a direct-current motor and a stirring assembly. A stepped flow channel is formed in the piston to prolong the flowing path of magnetorheological fluid and increase output damping force, the temperature difference between the magnetorheological fluid and the piston is converted into electric energy through the temperature difference power generation assembly, the stirring assembly is provided with a thermal power assembly and a plurality of stirring blades, and each stirring blade is connected with the thermal power assembly through an adjusting assembly. The thermodynamic assembly is driven to work based on magnetorheological fluid temperature difference changes, the inclination angle of the stirring blades is adjusted, and therefore the stirring strength is adjusted in a self-adaptive mode according to the temperature. Through the collaborative design of temperature difference self-energy supply, stirring strength self-adaptive adjustment and the stepped flow channel, the problems that a traditional vehicle-mounted magnetorheological damper anti-sedimentation scheme depends on external source power supply, sedimentation is aggravated under the high-temperature working condition, and damping force is insufficient are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle shock absorption, and in particular to a magnetorheological damper and a magnetorheological suspension. Background Art

[0002] As the core actuator of a vehicle semi-active suspension, a magnetorheological damper adjusts the apparent viscosity of magnetorheological fluid in real time through an external magnetic field, thereby controlling the damping force in real time. Its performance directly affects the ride comfort and handling stability of the vehicle. However, in actual vehicle operating conditions, there are two major technical bottlenecks: on the one hand, in urban slow driving or idling states, the suspension system is in a low shear rate condition for a long time, and the magnetic particles in the magnetorheological fluid gradually settle due to density differences, resulting in non-linear distortion of the damping force output; on the other hand, in continuous braking or off-road bumpy sections, the working temperature of the magnetorheological fluid rises suddenly, causing a sharp reduction in the viscosity of the carrier fluid, further accelerating particle settlement and causing suspension response delay, resulting in suspension response speed lag. Limited by the vehicle chassis space layout, an active anti-settlement solution relying on an external power supply requires additional power supply lines to be laid, increasing the overall vehicle energy consumption.

[0003] Existing magnetorheological dampers have the following defects: First, the structure is complex, the energy consumption is high, and the maintenance cost is high.

[0004] Second, the flow path of the magnetorheological fluid is single, resulting in a limited damping force adjustment range; Third, it is impossible to efficiently disturb the bottom area of the magnetorheological fluid according to the settlement state of the magnetorheological fluid. Summary of the Invention

[0005] The present invention aims to at least improve one of the technical problems existing in the prior art. To this end, the present invention provides a magnetorheological damper and a magnetorheological suspension.

[0006] The technical solution of the present invention is as follows: A magnetorheological damper, comprising: A cylinder body, with a cavity provided on the side wall; Two end covers, installed at both ends of the cylinder body, forming a sealed cavity with the cylinder body; A piston, in close contact with the cylinder body, and a multi-layer stepped flow channel is provided inside the piston; A piston rod, one end of which is fixedly connected to the piston, and the other end passes through the end cover and extends out of the sealed cavity; A first floating piston, in close contact with the cylinder body, separating the sealed cavity into a first liquid cavity and a second liquid cavity, for filling magnetorheological fluid and coolant respectively, the first floating piston is elastically connected to the end cover away from the piston rod, and the second liquid cavity communicates with the cavity; A thermoelectric power generation component, embedded and installed in the first floating piston, provides different voltages based on the temperature difference change of the magnetorheological fluid; A DC motor, installed on the surface of the first floating piston, is electrically connected to the thermoelectric power generation component; A stirring component, connected to the output shaft of the DC motor, has a thermodynamic component and a plurality of stirring blades. Each stirring blade is connected to the thermodynamic component through an adjusting component. Based on the temperature difference change of the magnetorheological fluid, the thermodynamic component is driven to work, thereby driving the adjusting component to adjust the inclination angle of the stirring blade.

[0007] In a possible technical solution, further, the stirring component includes: A plurality of stirring blades; A main shaft, coaxially connected to the output shaft of the DC motor; A blade connector, connected to the main shaft far from the DC motor. A plurality of mounting holes are provided on the side wall of the blade connector; A deep groove ball bearing, installed in the mounting hole; A blade support, installed in the inner ring of the deep groove ball bearing, for connecting the stirring blade. A support rod is provided on the side wall of the blade support, so that the blade support can swing freely around the axis of the mounting hole to adjust the horizontal inclination angle of the stirring blade; A thermodynamic component, fixedly installed on the main shaft, has a driving part, which is driven to move based on the temperature difference change of the magnetorheological fluid, wherein the driving part is a connecting rod support; An adjusting component, including a plurality of connecting units. Each connecting unit is respectively connected to the driving part and the support rod, and the horizontal inclination angle of the stirring blade is adjusted by the movement of the driving part.

[0008] In a possible technical solution, further, the thermodynamic component includes: A wax storage cylinder, fixedly connected to the main shaft. The main shaft passes through the wax storage cylinder and is connected to the blade connector; A push cylinder, nested on the main shaft, and slidably matched with the wax storage cylinder. A driving part is provided at the end of the push cylinder far from the wax storage cylinder. The push cylinder and the wax storage cylinder and the main shaft form a sealed annular cavity; Paraffin wax, filled in the annular cavity.

[0009] In a possible technical solution, further, the connecting unit is integrally stepped and includes: A first connecting rod, circumferentially installed on the side surface of the driving part; A second connecting rod, connected to the end of the first connecting rod far from the driving part; The third connecting rod is connected to the end of the second connecting rod away from the first connecting rod, and the other end is movably connected to the support rod to adjust the horizontal tilt angle of the stirring blade.

[0010] In a possible technical solution, further, the piston includes: A piston body; A multi-layer stepped flow channel is opened inside the piston body, and each layer of the stepped flow channel includes a plurality of sub-flow channels distributed at equal angular intervals, and the cross-section of each sub-flow channel is an arc-shaped notch.

[0011] In a possible technical solution, further, a cavity is opened on the circumferential side of the piston body; The magnetorheological damper further includes: An excitation coil is arranged in the cavity and is used to generate a magnetic field when the excitation coil is energized, so that the magnetorheological fluid in the flow channel forms a chain structure, further increasing the shear stress.

[0012] In a possible technical solution, further, the thermoelectric power generation component includes: A plurality of thermoelectric power generation chips, having a cold end and a hot end, and the cold ends thereof are embedded and fixed in the first floating piston; A boost circuit module is embedded and fixed in the first floating piston and is electrically connected to the thermoelectric power generation chip and the DC motor; A heat conducting sheet is fixedly connected to the first floating piston, and the heat conducting sheet is in contact with the hot end of the thermoelectric power generation chip.

[0013] In a possible technical solution, further, it further includes: A second floating piston is located in the cavity and is movably connected to the cylinder block, dividing the cavity into a first cavity and a second cavity, and the second cavity communicates with the second liquid cavity to form a coolant compensation chamber.

[0014] The magnetorheological damper according to the present invention has the following beneficial effects: First, through the adaptive stirring component, the thermodynamic component can be driven to work under the condition of temperature difference change of the magnetorheological fluid, so as to drive the adjusting component to adjust the tilt angle of the stirring blade, dynamically enhance the stirring intensity of the stirring component, realize the adaptive adjustment of the stirring intensity, and effectively prevent the magnetic particle settlement of the magnetorheological damper in a high-temperature working environment, improving the stability of the damper during long-term operation.

[0015] Second, the temperature difference of the magnetorheological fluid can be converted into electrical energy through a thermoelectric power generation component, providing electrical energy for driving a DC motor to achieve continuous stirring of the magnetorheological fluid. In addition, a coolant compensation chamber is provided in the cylinder wall of the present invention. The pre-pressurized nitrogen and the coolant chamber are separated by a second floating piston to form a dynamic contact maintenance mechanism: when the first floating piston undergoes an axial displacement due to the vibration of the damper, the pre-pressurized nitrogen pushes the second floating piston to move synchronously, so that the coolant always fills the second liquid chamber to ensure that the sheet-like heat dissipation structure of the first floating piston is completely immersed in the coolant, thereby forcibly reducing the cold-end temperature of the thermoelectric power generation sheet. This temperature difference-driven vehicle-mounted anti-settling magnetorheological damper does not require an external power source and can achieve self-power supply for stirring under a compact structure.

[0016] Third, the stepped flow channel inside the piston extends the flow path of the magnetorheological fluid, increases the working area of the magnetorheological fluid flowing through the damping gap. Combining with the aforementioned anti-settling function of the magnetorheological fluid, it effectively prevents the blockage of the magnetorheological fluid in the curved damping gap, increases the output damping force under a fixed magnetic field, and can be used to improve the vehicle ride comfort.

[0017] A magnetorheological suspension, which includes the above-mentioned magnetorheological damper.

[0018] A vehicle, wherein the vehicle includes the magnetorheological suspension as described above.

[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic cross-sectional view of a magnetorheological damper according to an embodiment of the present invention; Figure 2 is a top view of the piston of the magnetorheological damper according to an embodiment of the present invention; Figure 3 is an exploded schematic view of the thermoelectric power generation component of the magnetorheological damper according to an embodiment of the present invention; Figure 4 is a schematic view of the first floating piston of the magnetorheological damper according to an embodiment of the present invention; Figure 5 is a schematic structural view of the stirring component of the magnetorheological damper according to an embodiment of the present invention; Figure 6 Schematic diagram of the movement of the stirring assembly of the magnetorheological damper according to an embodiment of the present invention; Figure 7 Schematic diagram of the thermodynamic component structure of the stirring assembly of the magnetorheological damper according to an embodiment of the present invention; Figure 8 is Figure 7 Enlarged schematic diagram of part A of

[0022] Reference numerals: Cylinder block 1; Spring 20, first end cover 21, first O-ring 211, second end cover 22; Piston 3, stepped flow channel 31; Piston rod 4; First floating piston 5, motor groove 51; Thermoelectric generator 61, boost circuit module 62, heat conducting sheet 63; DC motor 7; Stirring blade 81, main shaft 82, connecting rod support 821, blade connector 83, mounting hole 831, deep groove ball bearing 84, blade support 85, support rod 851, wax storage cylinder 861, set screw 8610, push cylinder 862, paraffin wax 863, first connecting rod 871, second connecting rod 872, third connecting rod 873, plum coupling 88; Excitation coil 9; Second floating piston 10. Detailed implementation manners

[0023] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the drawings are exemplary. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] In the description, claims, and drawings of this application, the terms "first", "second", "third", etc. are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a series of steps or units are included, or optionally, steps or units not listed are further included, or optionally, other steps or units inherent to these processes, methods, products, or devices are further included.

[0027] Only parts related to this application are shown in the drawings, not all content. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operations are completed, but there can also be additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0028] The terms "component", "module", "system", "unit", etc. used in this specification are used to represent computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a unit can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or distributed between two or more computers. In addition, these units can be executed from various computer-readable media storing various data structures. A unit can communicate, for example, through signals with other systems through local and / or remote processes according to signals having one or more data packets (such as data from a second unit interacting with a local system, a distributed system, and / or a network. For example, the Internet interacting with other systems through signals).

[0029] Comparative example A magnetorheological damper, in which the anti-settling design of the magnetorheological fluid is to integrate a motor-driven stirring blade inside the damper to regularly stir the magnetorheological fluid to delay settling. This solution relies on an external power supply, and has defects such as high energy consumption, complex structure, and high maintenance cost.

[0030] Embodiment 1 As Figures 1 to 8 shown, this embodiment provides a magnetorheological damper, which includes: a cylinder body 1, with a cavity provided on the side wall. In this embodiment, upper and lower annular limiting protrusions are axially spaced on the inner wall of the cylinder body 1, where the upper annular limiting protrusion corresponds to the maximum stroke limit position of the piston 3, and the lower annular limiting protrusion defines the maximum stroke limit position of the first floating piston 5.

[0031] Two end covers are installed at both ends of the cylinder block 1 and form a sealed cavity with the cylinder block 1. The cavity includes a first cavity and a second cavity that communicate with each other. A piston 3 is located in the first cavity and is in close contact with the cylinder block 1. Two layers of stepped flow channels 31 are circumferentially formed inside the piston 3. A piston rod 4 has one end fixedly connected to the piston 3 and the other end passing through the end cover and extending out of the first cavity. In this embodiment, the piston rod 4 is connected to an upper lifting lug, where the upper lifting lug is provided with an internal threaded hole, and the top of the piston rod 4 is machined with an external thread, and the two are connected by thread fitting. An axially penetrating excitation coil channel is provided inside the piston rod 4 for arranging the connection terminals of the excitation coil 9.

[0032] A first floating piston 5 is located in the second cavity and is in close contact with the cylinder block 1. The first floating piston 5 is elastically connected to the end cover away from the piston rod 4 to form an axial buffer compensation, dividing the second cavity into a first liquid chamber and a second liquid chamber for filling magnetorheological fluid and coolant respectively. The second liquid chamber communicates with the cavity. In this embodiment, the first floating piston 5 is connected to the end cover away from the piston rod 4 by a spring 20. A thermoelectric power generation component is embedded in the first floating piston 5 near the first cavity to provide different voltages based on the temperature difference change of the magnetorheological fluid. A DC motor 7 is installed on the surface of the first floating piston 5 near the first cavity and is electrically connected to the thermoelectric power generation component. In this embodiment, the DC motor 7 is fixed to the surface of the first floating piston 5 by a slotted cheese head screw. A stirring component is connected to the output shaft of the DC motor 7 and has a thermal power component and a plurality of stirring blades 81. Each stirring blade 81 is connected to the thermal power component through an adjusting component. Based on the temperature difference change of the magnetorheological fluid, the thermal power component is driven to work, thereby driving the adjusting component to adjust the tilt angle of the stirring blade 81.

[0033] It should be noted that the end cover includes: A first end cover 21 is fixed to the cylinder block 1 by a slotted cheese head screw. The first end cover 21 is provided with a circular through hole for the piston rod 4 to pass through and has a clearance fit with the outer surface of the piston rod 4. A first O-ring 211 is provided between the first end cover 21 and the piston rod 4. A second end cover 22 is fixed to the cylinder block 1 by a slotted cheese head screw. The bottom of the second end cover 22 is machined with an external thread and is threadedly connected to the lower lifting lug. Such as Figure 1As shown in the figure, it is a schematic cross-sectional view of the magnetorheological damper according to an embodiment of the present invention. It should be noted that the piston 3 includes: A piston body, on the end face of which a square notch is provided for the excitation coil 9 to pass through. A circular through hole is provided at the center of the piston body, which is in clearance fit with the piston rod 4. The axial position of the piston body is fixed by the shoulder of the piston rod 4 and the fastening nut; Two layers of stepped flow channels 31 are provided inside the piston body. Each layer of stepped flow channels 31 includes a plurality of sub-flow channels distributed at equal angular intervals. The cross-section of each sub-flow channel is a notch structure with a 30° arc transition, as Figure 2 shown. It is a top view of the piston according to an embodiment of the present invention. In this embodiment, each layer of stepped flow channels 31 includes six sub-flow channels, and the central angle of the interval arc length between each sub-flow channel is 30°, which is convenient for extending the flow path of the magnetorheological fluid and increasing the working area of the magnetorheological fluid flowing through the damping gap.

[0034] It should be noted that a cavity is provided on the circumferential side of the piston body; The magnetorheological damper further includes: An excitation coil 9 is arranged in the cavity. When the excitation coil is energized, a magnetic field is generated to make the magnetorheological fluid in the flow channel form a chain structure, further increasing the shear stress.

[0035] It should be noted that a second O-ring seal is provided between the piston 3 and the first floating piston 5 and the cylinder block 1 to ensure the dynamic seal between each piston and the inner wall of the cylinder block 1.

[0036] It should be noted that a sunk groove is provided on the surface of the first floating piston 5. A motor groove 51 is provided at the center of the sunk groove for installing a DC motor. Among them, a plurality of grooves are also provided on the surface of the first floating piston 5 at the center of the sunk groove for embedding some components of the thermoelectric power generation assembly.

[0037] As Figure 4 shown, it is a schematic diagram of the first floating piston according to an embodiment of the present invention. It should be noted that a radially distributed sheet-like heat dissipation structure is processed on the surface of the first floating piston 5 away from the piston 3. The sheet-like heat dissipation structure is continuously immersed in the coolant to reduce the cold-end temperature of the thermoelectric power generation sheet thermoelectric power generation assembly, increase the temperature difference between the two surfaces of the thermoelectric power generation assembly, and improve the thermoelectric conversion efficiency.

[0038] As Figure 3 shown, it is an exploded schematic diagram of the thermoelectric power generation assembly according to an embodiment of the present invention. It should be noted that the thermoelectric power generation assembly includes: A plurality of thermoelectric power generation chips 61, having a cold end and a hot end, and their cold ends are embedded and fixed in the first floating piston 5; The boost circuit module 62 is embedded and fixed within the first floating piston 5 and is electrically connected to the thermoelectric power generation chip 61 and the DC motor 7. The heat conducting sheet 63 is fixedly connected to the first floating piston 5 by a slotted cheese head screw. The heat conducting sheet 63 is in contact with the hot end of the thermoelectric power generation chip 61. In this embodiment, the heat conducting sheet 63 is a copper heat conducting sheet.

[0039] When the magnetorheological fluid is heated, the heat conducting sheet 63 conducts heat to the hot end of the thermoelectric power generation chip 61. Different magnitudes of voltages are formed in the thermoelectric power generation chip based on the temperature difference change of the magnetorheological fluid. After being boosted by the boost circuit module 62, the voltages are used to supply energy to the DC motor 7.

[0040] As Figure 5 shown, it is a schematic structural diagram of the stirring assembly according to an embodiment of the present invention. It should be noted that the stirring assembly includes: A plurality of stirring blades 81; The main shaft 82 is coaxially connected to the output shaft of the DC motor 7. In this embodiment, the main shaft 82 is fixedly connected to the output shaft of the DC motor 7 through a flexible coupling 88; The blade connector 83 is threadedly connected to the main shaft 82 away from the DC motor 7. Four mounting holes 831 are circumferentially and uniformly distributed on the side wall of the blade connector 83; The deep groove ball bearing 84 is press-fitted into the mounting hole 831; The blade support 85 is press-fitted into the inner ring of the deep groove ball bearing 84 and is used to connect the stirring blade 81. A support rod 851 is provided on the side wall of the blade support 85, enabling the blade support 85 to freely swing around the axis of the mounting hole 831 to adjust the horizontal tilt angle of the stirring blade 81; The thermo - dynamic component is fixedly installed on the main shaft 82 and has a driving part. Based on the temperature difference change of the magnetorheological fluid, the driving part is driven to move. In this embodiment, the driving part is the connecting rod support 821, which is integrally circular. Four protruding rods are circumferentially distributed on the connecting rod support 821 at 90°. One end of each protruding rod is respectively hinged to the first connecting rod 871; The adjusting component includes a plurality of connecting units. Each connecting unit is respectively connected to the driving part and the support rod 851, and the horizontal tilt angle of the stirring blade 81 is adjusted by the movement of the driving part.

[0041] It should be noted that the connecting unit is integrally in a stepped shape and includes: The first connecting rod 871 is circumferentially installed on the side surface of the driving part. Specifically, the first connecting rod 871 is fixedly connected to the side surface of the driving part through a short rod; The second link 872 is connected to the end of the first link 871 away from the driving part. In this embodiment, the second link 872 is hinged to the first link 871 and has a hinge point; The third link 873 is connected to the end of the second link 872 away from the first link 871, and the other end is movably connected to the support rod 851 to adjust the horizontal inclination angle of the stirring blade 81.

[0042] As Figure 7 shown, it is a schematic structural diagram of the thermal power component according to an embodiment of the present invention. It should be noted that the thermal power component includes: The wax storage cylinder 861 is fixedly connected to the main shaft 82 through a set screw 8610. The main shaft 82 passes through the wax storage cylinder 861 and is connected to the blade connector 83; The push cylinder 862 is nested on the main shaft 82 and is slidably matched with the wax storage cylinder 861. A driving part is provided at the end of the push cylinder 862 away from the wax storage cylinder 861. The push cylinder 862 and the wax storage cylinder 861 and the main shaft 82 form a sealed annular cavity; Paraffin wax 863 is filled in the annular cavity. The paraffin wax 863 is paraffin wax with a high expansion coefficient. Based on the temperature rise of the magnetorheological fluid, the paraffin wax 863 expands to push the push cylinder 862 and its driving part to move in a direction away from the wax storage cylinder 861, thereby pushing the adjusting component to adjust the horizontal inclination angle of the stirring blade 81.

[0043] It should be noted that in this embodiment, the driving part may not be connected to the end of the push cylinder 862, and they are in contact with each other. The driving part is connected to the first link 871, which can increase the flexibility of angle adjustment in this embodiment.

[0044] It should be noted that this embodiment further includes: The second floating piston 10 is located in the cavity and is movably connected to the cylinder block 1, dividing the cavity into a first cavity and a second cavity. The second cavity communicates with the second liquid cavity to form a coolant compensation chamber.

[0045] It should be noted that a third O-ring is provided between the second floating piston 10 and the inner wall of the cylinder block 1 to ensure the dynamic seal between the second floating piston 10 and the inner wall of the cylinder block 1.

[0046] The working principle of the present invention is as follows: When the damper works, it causes the temperature of the magnetorheological fluid in the first cavity to rise. The heat is transferred to the hot end of the thermoelectric generator 61 through the heat conducting sheet 63 on the end face of the first floating piston 5, and a cold end is formed on the surface in contact with the first floating piston 5. The sheet-like heat dissipation structure of the first floating piston 5 is continuously immersed in the coolant to reduce the temperature of the cold end of the thermoelectric generator 61, increase the temperature difference between the cold end and the hot end on both surfaces of the thermoelectric generator 61, and improve the thermoelectric conversion efficiency. The electric energy output by the thermoelectric generator 61 drives the DC motor 7 through the boost circuit module 62 to achieve self-power supply. The DC motor 7 drives the main shaft 82 to rotate through the flexible coupling 88, and drives the stirring blade 81 to rotate, applying continuous mechanical disturbance to the magnetorheological fluid in the second cavity to inhibit particle settlement.

[0047] When the temperature of the magnetorheological fluid further rises, the paraffin wax 863 in the wax storage cylinder 861 expands due to heat, driving the push cylinder 862 to drive the connecting rod support 821 and the first connecting rod 871 to perform vertical displacement. The upward movement of the first connecting rod 871 causes the second connecting rod 872 to rotate counterclockwise around the hinge point, synchronously driving the third connecting rod 873 to move upward; this combined movement forces the protruding rod of the blade support 85 to deflect counterclockwise, realizing the adjustment of the horizontal tilt angle of the stirring blade 81 from the initial 20° to 45°, and realizing the self-adaptive temperature adjustment of the stirring intensity without an external control unit.

[0048] The double-layer stepped flow channel 31 inside the piston 3 extends the flow path. When the excitation coil 9 is energized, the magnetic field generated by the excitation coil 9 makes the magnetorheological fluid in the stepped flow channel 31 form a chain structure, further increasing the shear stress.

[0049] This embodiment establishes a self-regulating mechanism based on temperature difference: During the stage of rising temperature of the magnetorheological fluid, the output voltage of the thermoelectric generator 61 increases, driving the DC motor 7 to speed up. At the same time, the paraffin wax 863 expands due to heat, increasing the horizontal tilt angle of the stirring blade 81 and strengthening the mixing effect of the magnetorheological fluid; During the stage of decreasing temperature of the magnetorheological fluid, the output voltage of the thermoelectric generator 61 decreases, causing the DC motor 7 to run at a low speed. At the same time, the paraffin wax 863 shrinks, automatically reducing the horizontal tilt angle of the stirring blade 81.

[0050] According to the magnetorheological damper of the present invention, it can solve the technical defects of aggravated high-temperature settlement and insufficient damping force of traditional magnetorheological dampers, reduce the dependence of the anti-settlement magnetorheological damper on external power supplies. Through the collaborative design of self-power supply based on temperature difference, self-adaptive adjustment of stirring intensity and stepped flow channels, the present invention finally achieves the simultaneous increase of damping force and self-power supply while preventing magnetic particle settlement at the bottom of the damper.

[0051] The magnetorheological damper according to the present invention has the following beneficial effects: 1. An adaptive stirring assembly can drive a thermodynamic assembly to work under the condition of temperature difference change of magnetorheological fluid, thereby driving an adjusting assembly to adjust the tilt angle of the stirring blades, dynamically enhancing the stirring intensity of the stirring assembly, realizing the adaptive adjustment of the stirring intensity, and effectively preventing the magnetic particle settlement of the magnetorheological damper in a high-temperature working environment, improving the stability of the long-term operation of the damper.

[0052] 2. A thermoelectric power generation assembly can convert the temperature difference of magnetorheological fluid into electric energy to provide electric energy for driving a DC motor, realizing the continuous stirring of magnetorheological fluid. In addition, a coolant compensation chamber is arranged in the cylinder wall of the present invention, and a second floating piston is used to separate the pre-pressurized nitrogen from the coolant chamber to form a dynamic contact maintenance mechanism: when the first floating piston has an axial displacement due to the vibration of the damper, the pre-pressurized nitrogen pushes the second floating piston to move synchronously, so that the coolant always fills the second liquid chamber to ensure that the sheet heat dissipation structure of the first floating piston is completely immersed in the coolant, thereby forcibly reducing the cold-end temperature of the thermoelectric power generation sheet. This temperature difference-driven vehicle-mounted anti-settlement magnetorheological damper does not require an external power source and can realize self-powered stirring under a compact structure.

[0053] 3. The stepped flow channel inside the piston extends the flow path of magnetorheological fluid, increases the working area of magnetorheological fluid flowing through the damping gap. Combining with the aforementioned anti-settlement function of magnetorheological fluid, it effectively prevents the blockage of magnetorheological fluid in the curved damping gap, increases the output damping force under a fixed magnetic field, and can be used to improve the vehicle ride comfort.

[0054] Embodiment 2 This embodiment provides a magnetorheological suspension, which includes the above-mentioned magnetorheological damper.

[0055] Embodiment 3 This embodiment provides a vehicle, which includes the magnetorheological suspension as described above.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0057] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0058] Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. The mention of "embodiment" in this article means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0059] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A magnetorheological damper, characterized in that: include: The cylinder body (1) has a side wall provided with a cavity; Two end covers are mounted at both ends of the cylinder body (1) and form a closed cavity with the cylinder body (1); The piston (3) is in close contact with the cylinder body (1), and a multi-layer stepped flow channel (31) is provided inside the piston (3); A piston rod (4), one end of which is fixedly connected to the piston (3), and the other end of which passes through the end cover and extends out of the closed cavity; A first floating piston (5) is in close contact with the cylinder body (1) to divide the closed cavity into a first liquid chamber and a second liquid chamber for filling magnetorheological fluid and cooling liquid respectively, the first floating piston (5) is elastically connected to an end cover away from the piston rod (4), and the second liquid chamber is in communication with the containing cavity; A temperature difference power generation component, embedded and mounted in the first floating piston (5), and providing different voltages based on the temperature difference change of the magnetorheological fluid; A direct current motor (7) mounted on the surface of the first floating piston (5) and electrically connected to the temperature difference power generation assembly; A stirring assembly is connected to the output shaft of the DC motor (7), and comprises a thermal power assembly and a plurality of stirring blades (81). Each stirring blade (81) is connected to the thermal power assembly via an adjustment assembly. The thermal power assembly is driven to operate based on the temperature difference change of the magnetorheological fluid, thereby driving the adjustment assembly to adjust the inclination angle of the stirring blade (81).

2. The magnetorheological damper according to claim 1, characterized in that: The stirring assembly comprises: a plurality of stirring blades (81); A main shaft (82) coaxially connected to an output shaft of the DC motor (7); A blade connector (83) connected to the main shaft (82), wherein a side wall of the blade connector (83) is provided with a plurality of mounting holes (831); A deep groove ball bearing (84) mounted in the mounting hole (831); A blade support (85) is mounted on the deep groove ball bearing (84) and is used to connect the stirring blade (81); a support rod (851) is provided on a side wall of the blade support (85); A thermal power assembly is fixedly mounted on the main shaft (82) and has a driving part; The adjustment component comprises a plurality of connection units, each connection unit being connected to the driving part and the support rod (851) respectively, and being moved by the driving part to adjust the horizontal inclination angle of the stirring blade (81).

3. The magnetorheological damper according to claim 2, characterized in that: The thermal power assembly comprises: A wax storage cylinder (861) is fixedly connected to the main shaft (82); the main shaft (82) passes through the wax storage cylinder (861) and is connected to the blade connector (83); A push cylinder (862) is nested on the main shaft (82) and is slidably matched with the wax storage cylinder (861). A driving portion is provided at the end of the push cylinder (862). The push cylinder (862), the wax storage cylinder (861) and the main shaft (82) form a closed annular cavity. Paraffin (863) is filled in the annular cavity.

4. The magnetorheological damper according to claim 2, characterized in that: The connecting unit comprises: A first connecting rod (871) is mounted on the surface of the driving part; A second connecting rod (872) is mounted on the first connecting rod (871); The third connecting rod (873) is mounted on the second connecting rod (872) and is movably connected to the support rod (851) to adjust the horizontal inclination angle of the stirring blade (81).

5. The magnetorheological damper according to claim 1, characterized in that: The piston (3) comprises: Piston body; The multi-layer stepped flow channel (31) is opened inside the piston body, wherein each layer of the stepped flow channel (31) comprises a plurality of sub-flow channels distributed at intervals, and the cross section of each sub-flow channel is an arc notch.

6. The magnetorheological damper according to claim 5, characterized in that: A cavity is formed on the circumference of the piston body; The magnetorheological damper also includes: An excitation coil (9) is arranged in the cavity.

7. The magnetorheological damper according to claim 1, characterized in that: The temperature difference power generation component comprises: A plurality of temperature difference power generation sheets (61) having a cold end and a hot end, wherein the cold end is embedded in the first floating piston (5); A boost circuit module (62) is embedded in the first floating piston (5) and is electrically connected to the temperature difference power generation sheet (61) and the DC motor (7); A heat conducting sheet (63) is fixedly connected to the first floating piston (5), and the heat conducting sheet (63) is in contact with the hot end.

8. The magnetorheological damper according to claim 1, characterized in that: Also includes: A second floating piston (10) is located in the cavity and is movably connected to the cylinder body (1) to form a coolant compensation chamber.

9. A magnetorheological suspension, characterized in that: The invention comprises a magnetorheological damper as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes the magnetorheological suspension as claimed in claim 9.

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