A semi-active self-excited magnetorheological vehicle shock absorber

Abstract

The present application discloses a semi-active self-excited magnetorheological vehicle shock absorber, which relates to the field of vehicle engineering technology, and comprises a damping resistance piston, a liquid storage cylinder body and a piston rod connected in cooperation, wherein the liquid storage cylinder body is filled with magnetorheological fluid, a magnetic cylinder chamber is provided at the connection between the damping resistance piston and the piston rod, a permanent magnet and a floating spring are provided in the magnetic cylinder chamber, a coil is sleeved on the periphery of the magnetic cylinder chamber, and the winding direction of the coil is perpendicular to the movement direction of the permanent magnet, so that when the permanent magnet moves relative to the coil, the magnetic lines of force cut the coil to generate current and magnetic field, and the magnetorheological fluid in the liquid storage cylinder body is sensed to achieve resistance vibration reduction; the present application can dynamically adjust the damping force at the millisecond level to adapt to timely vibration reduction under different road conditions, and overcome the problems of information transmission and real-time response lag, limited use environment, and multiple device aging existing in traditional sensing information collection and signal and external current transmission methods.

Description

Technical Field

[0001] The present application relates to the field of vehicle engineering technology, and in particular to a semi-active self-excited magnetorheological vehicle shock absorber. Background Art

[0002] Vehicle vibration reduction is an indispensable functional measure to improve driving safety, enhance passenger comfort and enhance vehicle stability, especially for special vehicles.

[0003] The technologies that have been used and are being used for vehicle vibration reduction include: springs, fluid resistance, sensor monitoring and magnetorheology. In particular, in recent years, magnetorheological fluid vibration reduction has been used. Based on the input information of motion sensors that self-monitor the amplitude and speed of the vehicle body and wheels, it responds to road conditions and driving environment in real time and inputs current to the coil. The damping and resistance of the magnetorheological fluid are changed by current excitation, and the vibration reduction effect is achieved through the shock-absorbing piston. This method has achieved a certain application effect on vehicle vibration reduction. However, due to the problems that input information and real-time response cannot be achieved simultaneously, the service life of components such as displacement sensors is limited by the environment, the system interferes with complex signals and transmission is weakened, and maintenance is difficult, it is difficult to achieve the effect of popularization and application of magnetorheological fluid vibration reduction technology. To this end, the present application proposes a semi-active self-excited magnetorheological vehicle shock absorber to solve the above-mentioned drawbacks. Summary of the invention

[0004] In order to solve the above problems, the present application provides a semi-active self-excited magnetorheological vehicle shock absorber, which abandons the sensor information collection and signal and external current transmission method, uses a semi-active self-excited magnetorheological fluid resistance technology, so that magnetorheological fluid vibration reduction technology is widely used in vehicles. The technical solution is as follows:

[0005] The present application provides a semi-active self-excited magnetorheological vehicle shock absorber, comprising a damping resistance piston, a liquid storage cylinder body and a piston rod which are connected in cooperation, wherein the liquid storage cylinder body is filled with magnetorheological fluid, a magnetic cylinder chamber is provided at the connection between the damping resistance piston and the piston rod, a permanent magnet and a floating spring are provided in the magnetic cylinder chamber, a coil is sleeved on the periphery of the magnetic cylinder chamber, and the winding direction of the coil is perpendicular to the movement direction of the permanent magnet, so that when the permanent magnet moves relative to the coil, the magnetic lines of force cut through the coil to generate current and magnetic field, and induce the magnetorheological fluid in the liquid storage cylinder body to achieve resistance vibration reduction.

[0006] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, the permanent magnet moves in a suspended position along the radial direction of the piston rod in the magnetic cylinder chamber.

[0007] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, the floating spring is located on both sides of the permanent magnet and abuts against the inner wall of the magnetic cylinder chamber to keep the permanent magnet in a suspended servo state.

[0008] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, when the vibration damping resistance piston and the liquid storage cylinder body move relative to each other, the permanent magnet and the coil move in an offset manner during the relative movement, and the permanent magnet lags behind the movement of the coil due to the particle action, so that the magnetic lines of force of the permanent magnet cut through the coil to generate current and magnetic field, and change the liquid rheological properties of the magnetorheological fluid to achieve resistance vibration reduction.

[0009] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, an additional coil is provided on the periphery of the vibration damping resistance piston to increase the magnetic flow resistance of the gap between the vibration damping resistance piston and the liquid storage cylinder body.

[0010] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, a transformer diaphragm is wrapped outside the coil and the additional coil, and magnetorheological fluid is immersed outside the coil and the additional coil.

[0011] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, the magnetic cylinder chamber is a closed chamber.

[0012] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, the magnetorheological fluid is a magnetic soft particle suspension.

[0013] The beneficial effects of a semi-active self-excited magnetorheological vehicle shock absorber provided in some embodiments of the present application are as follows: the semi-active self-excited magnetorheological vehicle shock absorber of the present application is a suspension system installed between the axle and the wheel axle of the vehicle. When the vehicle is traveling on the road, it will shake and vibrate according to different road conditions. The semi-active self-excited magnetorheological shock absorber of the present application can dynamically adjust the damping force at the millisecond level to adapt to the timely vibration reduction under different road conditions. Parameters are calculated for different vehicle damping requirements, such as vibration speed, amplitude, and number of coil turns, to obtain a complete vibration reduction resistance match. The shock absorber structural components of the present application are highly feasible in production and manufacturing, and product molding, and can achieve wide application in vehicle vibration reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A cross-sectional view of a semi-active self-excited magnetorheological vehicle shock absorber provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] The present application provides a semi-active self-excited magnetorheological vehicle shock absorber. The semi-active self-excited magnetorheological vehicle shock absorber of the present application is a suspension system installed between the axle and the wheel axle of the vehicle, such as Figure 1 As shown, it includes a vibration-damping resistance piston 1, a liquid storage cylinder body 2 and a piston rod 3 that are matched and connected. The liquid storage cylinder body 2 is filled with magnetorheological fluid. A closed magnetic cylinder chamber 4 is provided at the connection between the vibration-damping resistance piston 1 and the piston rod 3. A permanent magnet 5 and a floating spring 6 are provided in the magnetic cylinder chamber 4. A coil 7 is sleeved on the outer periphery of the magnetic cylinder chamber 4. The winding direction of the coil 7 is perpendicular to the moving direction of the permanent magnet 5, so that when the permanent magnet 5 moves relative to the coil 7, the magnetic lines of force cut the coil 7 to generate current and magnetic field, and induce the magnetorheological fluid in the liquid storage cylinder body 2 to achieve resistance vibration reduction.

[0019] Among them, Figure 1 As shown, the permanent magnet 5 moves in radial suspension along the piston rod 3 in the magnetic cylinder chamber 4, that is, the permanent magnet 5 moves in longitudinal suspension in the magnetic cylinder chamber 4, and the supporting floating spring 6 is located on both sides of the permanent magnet 5 and abuts against the inner wall of the magnetic cylinder chamber 4, so that the permanent magnet 5 is in a suspended standby state, so that when the coil 7 acts first, the hysteresis effect of the permanent magnet 5 mass inertia and the force of the supporting floating spring 6 is formed, so that the coil 7 cuts the magnetic lines to generate current and generate a magnetic field.

[0020] The semi-active self-excited magnetorheological vehicle shock absorber of the present application is installed in a neutral position in the vehicle, and the floating spring 6 is located at the upper and lower sides of the permanent magnet 5 .

[0021] Since the winding direction of the coil 7 is perpendicular to the movement direction of the permanent magnet 5, Faraday's law of electromagnetic induction is used to form a misaligned movement between the permanent magnet 5 and the coil 7 during relative movement. The combination of the permanent magnet 5 in the magnetic cylinder chamber 4 and the coil 7 outside the magnetic cylinder chamber 4 is both a detection device and an electromagnetic generating device, which overcomes the problems of information transmission and real-time response lag, limited use environment, and multiple device aging in traditional sensing information collection and signal and external current transmission methods, and eliminates various signal collection and transmission devices such as displacement sensors, so that the damper device composition combination is simple to manufacture, reduces cost, greatly reduces failure rate, improves durability, and is quick to repair and replace.

[0022] When the vibration-damping resistance piston 1 and the liquid storage cylinder 2 move relative to each other, and the permanent magnet 5 lags behind the movement of the coil 7 due to the particle effect, the magnetic lines of force of the permanent magnet 5 cut the coil 7 to generate current and magnetic field, and change the liquid rheological properties of the magnetorheological fluid to achieve resistance vibration reduction.

[0023] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, Figure 1 As shown, an additional coil 8 is provided on the outer periphery of the vibration damping resistance piston 1 to increase the magnetic flow resistance of the gap between the vibration damping resistance piston 1 and the liquid storage cylinder body 2.

[0024] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, a transformer diaphragm is wrapped outside the coil 7 and the additional coil 8, and magnetorheological fluid is immersed outside the coil 7 and the additional coil 8.

[0025] According to the above embodiment, the magnetorheological fluid always surrounds the coil under normal conditions. Only in this way can the magnetic field generated by the coil through the current change the rheological state of the magnetorheological fluid, change the viscosity and increase the resistance; by wrapping the transformer diaphragm outside the coil 7 and the additional coil 8, the magnetorheological fluid does not need to be in direct contact with the coil, but the coil is encapsulated by the transformer diaphragm, and the magnetorheological fluid surrounds the entire coil on the outer surface of the transformer diaphragm; by wrapping the coil with a diaphragm, the magnetic particles in the magnetorheological fluid do not gather between the coils, and the magnetorheological fluid is kept uniform in properties.

[0026] For example, in the semi-active self-excited magnetorheological vehicle shock absorber provided in one embodiment, the magnetorheological fluid is a magnetic soft particle suspension.

[0027] The working principle of the semi-active self-excited magnetorheological vehicle shock absorber of the present application is as follows: when the vehicle is moving, the amplitude and speed generated by the road conditions enable the executive suspension to drive the shock-absorbing resistance piston 1 and the liquid storage cylinder 2 to move relative to each other. The permanent magnet 5 lags behind the movement of the coil 7 due to the particle effect. At this time, the magnetic lines of force of the permanent magnet 5 cut the coil 7 to generate current and also generate a magnetic field, inducing the magnetorheological fluid. The magnetorheological fluid in the liquid storage cylinder 2 is a magnetic soft particle suspension. When the liquid is injected into the electromagnetic coil 7 of the shock-absorbing resistance piston 1, the magnetic field of the coil 7 changes its liquid rheological properties (or generates fluid resistance). As the vehicle vibrates and the amplitude and vibration speed change, the current and magnetic field change accordingly, and the viscosity damping of the magnetorheological fluid also changes accordingly, responding quickly to achieve resistance vibration reduction.

[0028] When the semi-active self-excited magnetorheological vehicle shock absorber of the present application is used in actual applications, the vehicle will vibrate and bump along with different road conditions while driving on the road. The semi-active self-excited magnetorheological shock absorber of the present application can dynamically adjust the damping force at the millisecond level to adapt to the different road conditions and timely reduce vibration. Parameters are calculated for different vehicle damping requirements, such as vibration speed, amplitude, and number of coil turns, to obtain a complete vibration reduction resistance match. The shock absorber structural components of the present application are highly feasible for production and manufacturing, and product molding, and can achieve wide application in vehicle vibration reduction.

[0029] Although the implementation scheme of the present application has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes, and it can be fully applicable to various fields suitable for the present application. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present application is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A semi-active self-excited magnetorheological vehicle shock absorber, characterized in that: It includes a vibration-damping resistance piston, a liquid storage cylinder body and a piston rod that are connected in a matching manner. The liquid storage cylinder body is filled with magnetorheological fluid. A magnetic cylinder chamber is provided at the connection between the vibration-damping resistance piston and the piston rod. A permanent magnet and a floating spring are provided in the magnetic cylinder chamber. A coil is sleeved on the periphery of the magnetic cylinder chamber. The winding direction of the coil is perpendicular to the movement direction of the permanent magnet, so that when the permanent magnet moves relative to the coil, the magnetic lines of force cut through the coil to generate current and magnetic field, and induce the magnetorheological fluid in the liquid storage cylinder body to achieve resistance vibration reduction.

2. The semi-active self-excited magnetorheological vehicle shock absorber according to claim 1, characterized in that: The permanent magnet moves in a suspended position in the magnetic cylinder chamber along the radial direction of the piston rod.

3. The semi-active self-excited magnetorheological vehicle shock absorber according to claim 2, characterized in that: The floating springs are located at both sides of the permanent magnet and abut against the inner wall of the magnetic cylinder chamber, so that the permanent magnet is in a suspended servo state.

4. The semi-active self-excited magnetorheological vehicle shock absorber according to claim 3, characterized in that: When the vibration-damping resistance piston and the liquid storage cylinder body move relative to each other, the permanent magnet and the coil move in an offset manner during the relative movement, and the permanent magnet lags behind the movement of the coil due to the particle effect, so that the magnetic lines of force of the permanent magnet cut the coil to generate current and magnetic field, and change the liquid rheological properties of the magnetorheological fluid to achieve resistance vibration reduction.

5. The semi-active self-excited magnetorheological vehicle shock absorber according to claim 1, characterized in that: An additional coil is arranged on the outer periphery of the vibration-damping resistance piston to increase the magnetic flow resistance of the gap between the vibration-damping resistance piston and the liquid storage cylinder body.

6. The semi-active self-excited magnetorheological vehicle shock absorber according to claim 5, characterized in that: The coil and the additional coil are wrapped with a transformer diaphragm, and magnetorheological fluid is immersed in the outside of the coil and the additional coil.

7. The semi-active self-excited magnetorheological vehicle shock absorber according to claim 1, characterized in that: The magnetic cylinder chamber is a closed chamber.

8. The semi-active self-excited magnetorheological vehicle shock absorber according to claim 1, characterized in that: The magnetorheological fluid is a magnetic soft particle suspension.

Images