Magnetorheological damper magnetorheological fluid anti-settling mechanism

Abstract

The utility model discloses a magnetorheological damper magnetorheological fluid anti -precipitation mechanism, including cylinder, along the cylinder axis and reciprocating piston rod of setting, and the one end of piston rod is connected with piston head in the cylinder, is equipped with a plurality of through passageway on the piston head, still include the floating piston of being located in the cylinder, the fan blade subassembly of fixed connection in the floating piston upper end, the inside filling of cylinder above floating piston is with magnetorheological fluid, and the compensation gas chamber is formed below floating piston, and the compensation gas chamber is full of high pressure inert gas. The utility model does not need to configure motor, power supply or control module additionally, directly utilizes the reciprocating motion of damper own piston rod, drives the action of floating piston and fan blade subassembly through magnetorheological fluid pressure difference, realizes magnetorheological fluid stirring, both simplifies the structure, reduces the manufacturing cost, and also avoids the problem of external motor seal failure, short life, adapts the long -term use demand of damper.

Description

Technical Field

[0001] This utility model relates to a vehicle vibration damping system, specifically addressing the problem of particle sedimentation caused by the inherent compositional characteristics of the magnetorheological fluid (difference in density between magnetic particles and the base fluid) during the use of a magnetorheological fluid vibration damper for vehicles. It provides a structurally improved magnetorheological fluid vibration damper with anti-sedimentation function, that is, a magnetorheological fluid vibration damper that prevents magnetorheological fluid sedimentation, thereby ensuring the stability of the vehicle vibration damping system. Background Technology

[0002] During vehicle operation, the suspension system experiences reciprocating vibrations in its elastic elements (such as coil springs and leaf springs) due to factors like uneven road surfaces and impacts from obstacles. If these vibrations are directly transmitted to the vehicle body, they can severely impact the ride comfort for the driver and passengers, while also reducing vehicle stability. To mitigate this issue, shock absorbers are typically installed in parallel with the elastic elements in the suspension system. These shock absorbers utilize internal damping to dissipate vibration energy and achieve vibration attenuation.

[0003] Currently, the shock absorbers used in vehicle suspension systems are mainly passive structures, such as traditional hydraulic shock absorbers. These absorbers achieve vibration reduction by generating damping force through the flow of oil through a one-way valve and throttle orifice as the piston moves. However, the damping coefficient of such passive shock absorbers is a fixed value and cannot be dynamically adjusted according to real-time road conditions (such as paved roads, gravel roads, speed bumps, etc.). On bumpy roads, fixed damping is insufficient to absorb vibrations, resulting in significant vehicle sway. At high speeds, insufficient damping may affect handling stability, making it difficult to maximize the driving comfort for both driver and passengers.

[0004] To address the limitations of passive shock absorbers, the industry has developed active and semi-active suspension systems. Active suspension systems use sensors to collect road conditions and vehicle driving status, actively adjusting damping force and spring stiffness. Theoretically, they can simultaneously satisfy ride comfort and driving safety. However, this system requires complex hydraulic / pneumatic drive modules, high-precision control units, and multiple sensors, resulting in high manufacturing costs and a high failure rate and maintenance difficulty due to its complex structure. Currently, it remains primarily a laboratory research project in China, hindering large-scale mass production and application. Semi-active suspension systems, on the other hand, consist of passive elastic elements and adjustable damping active shock absorbers. They do not require complex active drive mechanisms; vibration control is achieved simply by adjusting the damper's damping. They offer advantages such as moderate cost, relatively simple manufacturing processes, and balanced damping effects, and have gradually become the mainstream development direction for modern automotive suspension systems.

[0005] In the core component of semi-active suspension systems—the adjustable damping shock absorber—magnetorheological fluid shock absorbers have become a research hotspot due to their fast damping adjustment response (millisecond level), wide adjustment range, and high control precision. For example, Chinese utility model patent CN201723641 U discloses a novel magnetorheological fluid shock absorber, which mainly includes a hanging ring assembly connected to the rear axle of an automobile, a working cylinder filled with magnetorheological fluid, an end cap for sealing, a coil that generates a magnetic field, and a floating piston that divides the working cylinder cavity into upper and lower chambers. The lower chamber is filled with nitrogen, and the upper chamber is filled with magnetorheological fluid. A control line is led out through the inner hole of the piston rod and connected to the coil. By changing the coil current, the magnetic field strength is adjusted, thereby changing the damping characteristics of the magnetorheological fluid.

[0006] Magnetorheological fluid, as the core functional medium of magnetorheological fluid dampers, mainly consists of a base fluid (such as silicone oil, mineral oil, etc.) and magnetic response particles. The magnetic response particles are usually selected from paramagnetic compounds, superparamagnetic compounds, or ferromagnetic compounds, and may include materials such as iron, ferroalloys, iron oxide, carbonyl iron, chromium dioxide, nickel, cobalt, and mixtures thereof. Under the action of a magnetic field, these particles can quickly form chain-like or columnar structures, thereby changing the flow characteristics of the magnetorheological fluid and achieving damping adjustment.

[0007] To mitigate the sedimentation problem of magnetically responsive particles, existing technologies typically add anti-settling agents (such as dispersants and thickeners) to the magnetorheological fluid to improve the dispersion stability of the particles in the base fluid. However, in actual use, due to the inherent density difference between the magnetically responsive particles and the base fluid, the tendency for gravity sedimentation is difficult to completely eliminate: when the vehicle is parked for a long time (the shock absorber is stationary), the particles gradually deposit at the bottom of the working cylinder; when the vehicle is traveling at low speed or under small amplitude vibration conditions (such as passing at a constant speed on a gently paved road), the flow velocity of the magnetorheological fluid in the shock absorber is slow, resulting in insufficient disturbance to the particles, and the sedimentation phenomenon will further accumulate. This sedimentation not only leads to a decrease in the concentration of effective magnetically responsive particles in the magnetorheological fluid, reducing the range of damping force variation under magnetic field regulation and decreasing the regulation accuracy, thus affecting the vibration damping effect; if the sedimentation phenomenon continues to worsen, it may also form a hard sediment layer, causing piston movement to become stuck, and the coil magnetic field to be unable to act evenly on the magnetorheological fluid, ultimately causing the magnetorheological fluid shock absorber to malfunction, seriously threatening vehicle driving safety. Utility Model Content

[0008] This invention addresses the problem that in existing magnetorheological dampers, magnetic response particles in the magnetorheological fluid tend to precipitate due to density differences during static storage or long-term operation, leading to decreased damping adjustment accuracy, reduced damper reliability, or even failure. Instead, it provides a magnetorheological damper anti-precipitation mechanism that dynamically stirs the magnetorheological fluid through the damper's own movement, suppressing precipitation at the structural level, ensuring stable operation of the damper, and extending its service life.

[0009] To achieve the above-mentioned objectives, this utility model adopts the following technical solution: A magnetorheological damper magnetorheological fluid anti-sedimentation mechanism includes a cylinder, a piston rod that passes through the cylinder axis and can reciprocate, a piston head connected to one end of the piston rod that extends into the cylinder, and a number of through channels on the piston head, and the piston head is sealed to the inner wall of the cylinder. It also includes a floating piston disposed inside the cylinder and a fan blade assembly fixedly connected to the upper end of the floating piston; The cylinder above the floating piston is filled with magnetorheological fluid, and a compensation chamber is formed below the floating piston, which is filled with high-pressure inert gas.

[0010] Further technology of this utility model: Preferably, the fan blade assembly is completely immersed in the magnetorheological fluid of the storage cavity, and a gap is reserved between the edge of the fan blade assembly and the inner wall of the bottom of the cylinder.

[0011] Preferably, the floating piston has a sealing structure on its outer periphery, which is in sealing fit with the inner wall of the inner cylinder.

[0012] Preferably, the fan blade assembly includes a fan blade shaft and arc-shaped blades distributed circumferentially along the fan blade shaft, and the fan blade shaft is coaxially connected to the floating piston.

[0013] Preferably, a control valve is provided on the upper part of the cylinder.

[0014] Preferably, the control valve is a check valve, an adjustable flow valve, or a solenoid control valve.

[0015] Preferably, the top of the cylinder is provided with a guide sleeve for guiding the piston rod.

[0016] Preferably, a coil is installed in the piston head and connected to an external controller via a control line. The control line is led out through the central through hole of the piston rod and connected to an external power source.

[0017] The beneficial effects of this utility model are: 1. This utility model does not require additional configuration of motor, power supply or control module. It directly utilizes the reciprocating motion of the piston rod of the shock absorber itself to drive the floating piston and fan blade assembly through the pressure difference of magnetorheological fluid, thereby realizing the stirring of magnetorheological fluid. This simplifies the structure, reduces manufacturing costs, and avoids the problems of seal failure and short life of external motors, making it suitable for the long-term use requirements of shock absorbers.

[0018] 2. This utility model uses a floating piston to divide the bottom of the cylinder into an independent storage chamber. The fan blade assembly is completely immersed in the magnetorheological fluid in the storage chamber, and a reasonable gap is reserved between the edge of the blade and the inner wall of the cylinder. This allows for targeted stirring of the bottom area where sedimentation is easy to occur, eliminating the "stirring dead corner" of the traditional fixed stirring structure. The anti-sedimentation effect is more thorough, and it can effectively maintain the uniform dispersion of magnetic response particles in the magnetorheological fluid, ensuring the damping adjustment accuracy of the vibration damper.

[0019] 3. The floating piston of this utility model achieves dynamic sealing through an elastic sealing ring, and together with the dustproof seal of the guide sleeve at the top of the cylinder, the double sealing structure can effectively prevent the leakage of magnetorheological fluid and the intrusion of external impurities, further improving the working reliability of the shock absorber.

[0020] 4. The floating piston and fan blade assembly used in this utility model are made of common lightweight alloys or engineering plastics. The processing technology is mature and the cost is low. Moreover, the structure of each component is simple and the assembly is convenient, which facilitates mass production and gives it strong market competitiveness. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model; The markings in the diagram are: 1 is the control valve, 2 is the cylinder, 3 is the piston rod, 4 is the magnetorheological fluid, 5 is the fan blade assembly, 6 is the floating piston, 7 is the channel, 8 is the compensation chamber, 9 is the guide sleeve, 10 is the coil, 11 is the upper connecting ring, and 12 is the lower connecting ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] Example 1: As Figure 1As shown, the magnetorheological damper anti-sedimentation mechanism provided by this utility model includes a cylinder 2, which is a hollow cylindrical structure. The top is sealed by an end cap, and the upper part is fixed to a control valve 1 by a threaded connection. The control valve 1 is used to regulate the fluid state of the magnetorheological fluid 4 at the bottom of the cylinder 2. The end cap is provided with a valve-type injection hole and a needle-shaped exhaust valve to facilitate the injection of the magnetorheological fluid 4 and the discharge of air from the cylinder.

[0025] A piston rod 3, which is reciprocating and passes through the axis of the cylinder 2, is provided with a guide sleeve 9 at the top of the cylinder 2 to guide the piston rod 3. The piston rod 3 passes through the axis of the cylinder 2, with an upper connecting ring 11 extending beyond the cylinder 2 at its upper end and a lower connecting ring 12 at the bottom of the cylinder 2. The shock absorber is fixed by the upper and lower connecting rings. The lower end of the piston rod 3 extends into the cylinder 2 and is fixedly connected to the piston head.

[0026] The piston head has several through channels 7, and the outer circumference of the piston head has three sealing rings, which form a sliding seal with the inner wall of the cylinder 2.

[0027] It also includes a floating piston 6 disposed inside the cylinder 2 and a fan blade assembly 5 fixedly connected to the upper end of the floating piston 6; the cylinder 2 above the floating piston 6 is filled with magnetorheological fluid 4, and a compensation chamber 8 is formed below the floating piston 6, which is filled with high-pressure inert gas.

[0028] It should be noted that the inner wall of cylinder 2 is honed to reduce surface roughness and ensure smooth sliding of floating piston 6.

[0029] The fan blade assembly 5 is completely immersed in the magnetorheological fluid 4 in the storage cavity, and a gap is reserved between the edge of the fan blade assembly 5 and the bottom inner wall of the cylinder 2. The fan blade assembly 5 includes a fan blade shaft and arc-shaped blades distributed along the circumference of the fan blade shaft, and the fan blade shaft is coaxially connected to the floating piston 6.

[0030] A coil 10 is installed in the piston head and connected to an external controller via a control line. The control line is led out through the central through hole of the piston rod 3 and connected to an external power source. When the coil 10 is energized, a magnetic field is generated, which changes the properties of the magnetorheological fluid in the channel 7, thereby adjusting the damping characteristics of the magnetorheological fluid 4.

[0031] The magnetorheological fluid 4 is composed of a base fluid, magnetic particles, and a dispersant.

[0032] The floating piston 6 is made of a lightweight material, and the fan blade assembly 5 is made of a lightweight material with suitable strength.

[0033] When the vehicle is in motion, the road vibration causes the piston rod 3 to reciprocate along the axis of the cylinder 2. The reciprocating motion of the piston rod 3 creates a pressure difference in the magnetorheological fluid 4 inside the cylinder 2. This pressure difference acts on the floating piston 6, driving the floating piston 6 to reciprocate synchronously along the axis of the cylinder 2. When the floating piston 6 moves, it drives the fan blade assembly 5 above it to rotate. The blades of the fan blade assembly 5 stir the magnetorheological fluid 4, breaking the sedimentation trend of magnetic particles in the magnetorheological fluid, thereby inhibiting the precipitation of magnetic particles, ensuring the stability of the magnetorheological fluid performance, and thus ensuring the damping adjustment accuracy and working reliability of the shock absorber.

[0034] Example 2: As Figure 2 As shown, the magnetorheological damper magnetorheological fluid anti-sedimentation mechanism provided by this utility model differs from Embodiment 1 only in that this embodiment uses a double-layer coil.

[0035] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A magnetorheological damper magnetorheological fluid anti-sedimentation mechanism, characterized in that, Includes a cylinder (2) and a piston rod (3) that passes through the cylinder (2) and can reciprocate. One end of the piston rod (3) that extends into the cylinder (2) is connected to a piston head. The piston head is provided with several through channels (7). The piston head is sealed to the inner wall of the cylinder (2). It also includes a floating piston (6) disposed in the cylinder (2) and a fan blade assembly (5) fixedly connected to the upper end of the floating piston (6); The cylinder (2) above the floating piston (6) is filled with magnetorheological fluid (4), and a compensation chamber (8) is formed below the floating piston (6), which is filled with high-pressure inert gas.

2. The magnetorheological damper anti-sedimentation mechanism for magnetorheological fluid according to claim 1, characterized in that: The fan blade assembly (5) is completely immersed in the magnetorheological fluid (4), and a gap is reserved between the edge of the fan blade assembly (5) and the bottom inner wall of the cylinder (2).

3. The magnetorheological damper anti-sedimentation mechanism for magnetorheological fluid according to claim 1, characterized in that: The floating piston (6) has a sealing structure on its outer periphery, which is in sealing fit with the inner wall of the cylinder (2).

4. The magnetorheological damper anti-sedimentation mechanism for magnetorheological fluid according to claim 1, characterized in that: The fan blade assembly (5) includes a fan blade shaft and arc-shaped blades distributed around the circumference of the fan blade shaft, and the fan blade shaft is coaxially connected to the floating piston (6).

5. The magnetorheological damper anti-sedimentation mechanism for magnetorheological fluid according to claim 1, characterized in that: The cylinder (2) is equipped with a control valve (1) on its upper part.

6. The magnetorheological damper anti-sedimentation mechanism for magnetorheological fluid according to claim 5, characterized in that: The control valve (1) is a check valve, an adjustable flow valve, or an electromagnetic control valve.

7. The magnetorheological damper anti-sedimentation mechanism for magnetorheological fluid according to claim 1, characterized in that: The top of the cylinder (2) is provided with a guide sleeve (9) for guiding the piston rod (3).

8. The magnetorheological damper anti-sedimentation mechanism for magnetorheological fluid according to claim 1, characterized in that: A coil (10) is installed in the piston head and connected to an external controller via a control line. The control line is led out through the central through hole of the piston rod (3) and connected to an external power source.

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