阅读说明：本技术 一种具有回中功能的旋转式磁流变减摆器及其减摆方法 (Rotary magneto-rheological shimmy damper with centering function and shimmy damping method thereof ) 是由 郑和洋 孟庆华 慎智勇 康志彬 彭玉东 赵鑫 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种具有回中功能的旋转式磁流变减摆器及其减摆方法。本发明包括外壳、旋转阻尼模块、泄压补偿模块、外部连接模块和角度传感器。旋转阻尼模块包括移动隔板、第一固定隔板、第二固定隔板、中心旋转轴、第一回位弹簧、第二回位弹簧、储液仓、第一阻尼孔、第二阻尼孔、第一挡板和第二挡板。泄压补偿模块包括储液罐、第一补偿单元和第二补偿单元。储液罐内装有阻尼液；第一补偿单元、第二补偿单元分别控制第一阻尼腔、第二阻尼腔与储液罐之间的通断。本发明通过角度传感器对移动隔板所在位置的检测,动态控制两个补偿单元的通断,从而实现对车轮提供回中的推力,能够有效抑制车轮受摆振的影响发生偏转,提高了行车安全性。(The invention discloses a rotary magneto-rheological shimmy damper with a centering function and a shimmy damping method thereof. The invention comprises a shell, a rotary damping module, a pressure relief compensation module, an external connection module and an angle sensor. The rotary damping module comprises a movable partition plate, a first fixed partition plate, a second fixed partition plate, a central rotating shaft, a first return spring, a second return spring, a liquid storage bin, a first damping hole, a second damping hole, a first baffle plate and a second baffle plate. The pressure relief compensation module comprises a liquid storage tank, a first compensation unit and a second compensation unit. Damping liquid is filled in the liquid storage tank; the first compensation unit and the second compensation unit respectively control the connection and disconnection between the first damping cavity and the liquid storage tank and between the second damping cavity and the liquid storage tank. According to the invention, the on-off of the two compensation units is dynamically controlled by detecting the position of the movable partition plate through the angle sensor, so that the return thrust is provided for the wheel, the deflection of the wheel under the influence of shimmy can be effectively inhibited, and the driving safety is improved.)

1. A rotary magneto-rheological shimmy damper with a centering function comprises a shell, a rotary damping module, a pressure relief compensation module, an external connection module and an angle sensor; the method is characterized in that: the angle sensor detects the rotation angle of a central rotating shaft (8) in the rotary damping module; the external connection module is connected with a central rotating shaft (8) in the rotary damping module; the rotary damping module comprises a movable partition plate (1), a first fixed partition plate (21), a second fixed partition plate (22), a central rotating shaft (8), a first return spring (9), a second return spring (10), a liquid storage bin (11), a first damping hole (12), a second damping hole (13), a first baffle plate (14) and a second baffle plate (15); the central rotating shaft (8) is supported at the central position of the inner cavity of the shell; one side edge of the movable partition plate (1) is fixed with the central rotating shaft (8); the other side edge of the movable clapboard (1) is propped against the inner side wall of the shell;

the first fixed clapboard (21) and the second fixed clapboard (22) are fixed in the shell; the outer edges of the first fixed clapboard (21) and the second fixed clapboard (22) are propped against the inner side wall of the shell, and the inner edges are propped against the central rotating shaft (8); one or more first damping holes (12) are formed in the inner side edge of each first fixed partition plate (21); one or more second damping holes (13) are formed in the inner side edges of the second fixed partition plates (22); the first baffle (14) and the second baffle (15) are both arranged between the first fixed clapboard (21) and the second fixed clapboard (22); the outer edges of the first baffle (14) and the second baffle (15) are respectively propped against the inner side wall of the shell, and the inner edges are respectively propped against the central rotating shaft (8); the first baffle (14) and the second baffle (15) and the inner cavity of the shell form a revolute pair taking the axis of the central rotating shaft (8) as a common axis; the inner cavity of the shell is divided into a gas compression cavity (29), a first damping cavity (30) and a second damping cavity (31) by the movable partition plate (1), the first baffle plate (14) and the second baffle plate (15); the gas compression chamber (29) is between the first baffle plate (14) and the second baffle plate (15); damping liquid is arranged in the first damping cavity (30) and the second damping cavity (31);

the pressure relief compensation module comprises a liquid storage tank (11), a first compensation unit (27) and a second compensation unit (28); damping liquid is filled in the liquid storage tank (11); the first compensation unit (27) and the second compensation unit (28) respectively control the connection and disconnection between the first damping cavity (30), the second damping cavity (31) and the liquid storage tank (11).

2. A rotary magnetorheological shimmy damper with centering function according to claim 1, wherein: the first compensation unit (27) and the second compensation unit (28) have the same structure and respectively comprise a valve body, a compensation valve (17), a pressure relief valve (18) and an on-off valve (19); the compensating valve (17), the pressure relief valve (18) and the on-off valve (19) are all arranged on the valve body; the valve body is provided with a liquid through port (20) communicated with the liquid storage bin (11); the valve core of the on-off valve (19) corresponds to the position of the liquid inlet (20); one end of each of the compensating valve (17) and the pressure relief valve (18) is connected to the liquid through port (20), and the other end of each of the compensating valve and the pressure relief valve is connected to the corresponding first damping cavity (30) or the corresponding second damping cavity (31); the compensating valve (17) and the pressure relief valve (18) both adopt one-way valves, and the liquid flowing directions are opposite; an input port of the compensating valve (17) is communicated with the liquid through port (20), and an output port of the compensating valve is communicated with the corresponding first damping cavity (30) or the second damping cavity (31); the input port of the pressure relief valve (18) is communicated with the corresponding first damping cavity (30) or the second damping cavity (31), and the output port is communicated with the liquid through port (20).

3. A rotary magnetorheological shimmy damper with centering function according to claim 1, wherein: a bidirectional pressure relief valve (26) is arranged on the movable partition plate (1); two liquid through ports of the two-way pressure relief valve (26) are connected with the first damping cavity (30) and the second damping cavity (31).

4. A rotary magnetorheological shimmy damper with centering function according to claim 1, wherein: the shell is provided with a coil group (6); a permanent magnet (7) is fixed on the movable clapboard (1); the damping fluid is magnetorheological fluid.

5. The rotary magnetorheological shimmy damper with a centering function according to claim 4, wherein: the shell comprises an inner cylinder (2), an inner cylinder end cover (3), an outer cylinder (4) and an outer cylinder end cover (5); the outer cylinder (4) is sleeved outside the inner cylinder (2); a gap is reserved between the inner side wall of the outer cylinder (4) and the outer side wall of the inner cylinder (2); a coil assembly (6) is disposed within the gap.

6. A rotary magnetorheological shimmy damper with centering function according to claim 1, wherein: the rotary damping module further comprises a first return spring (9) and a second return spring (10); one ends of the first return spring (9) and the second return spring (10) are fixed with the central rotating shaft (8), and the other ends of the first return spring and the second return spring are respectively fixed with the first baffle plate (14) and the second baffle plate (15).

7. A rotary magnetorheological shimmy damper with centering function according to claim 1, wherein: the shell is fixed on the axle; the external connecting module comprises a connecting rod (23) and a ball hinge (24); the outer end of a central rotating shaft (8) in the rotary damping module is connected with one end of a connecting rod (23) through a ball hinge (24); the other end of the connecting rod (23) is connected with a steering tie rod of the vehicle through a ball hinge.

8. A rotary magnetorheological shimmy damper with centering function according to claim 1, wherein: an arc chute (25) is arranged on the inner cylinder end cover (3) between the first fixed clapboard (21) and the second fixed clapboard (22); the two ends of the inner side edges of the first baffle plate (14) and the second baffle plate (15) are provided with convex blocks; the first baffle (14) and the second baffle (15) are rotationally connected with the arc chute (25) on the inner cylinder end cover (3) through the convex block.

9. A rotary magnetorheological shimmy damper with centering function according to claim 1, wherein: the first fixed clapboard (21) and the second fixed clapboard (22) form an acute angle; and a charging connector (16) is arranged at the side surface of the shell corresponding to the gas compression cavity (29).

10. The rotary magnetorheological pendulum damper with the centering function and the pendulum damping method thereof as claimed in claim 1, wherein: when the front wheel of the automobile generates shimmy, the vibration is transmitted to the central rotating shaft (8) through the external connecting module to drive the movable partition plate (1) on the central rotating shaft (8) to rotate;

when the angle sensor detects that the movable partition plate (1) is close to one side of the second damping cavity (31) relative to the initial center position and the rotating speed of the central rotating shaft (8) is greater than a preset value, the second compensation unit (28) disconnects the second damping cavity from the liquid storage bin; the first compensation unit (27) is used for communicating the first damping cavity with the liquid storage bin; at the moment, the movable partition plate (1) is close to one side of a second damping cavity (31) relative to the initial central position, damping liquid in the second damping cavity (31) pushes a second baffle plate (15) to rotate through a second damping hole (13), so that the volume in a gas compression cavity (29) is reduced, the pressure is increased, and force for returning to the central position is provided for the movable partition plate (1); meanwhile, damping force is generated in the process that the damping liquid enters and exits the second damping hole (13), and shimmy is restrained;

when the angle sensor detects that the movable partition plate (1) is close to one side of the first damping cavity (30) relative to the initial center position and the rotating speed of the central rotating shaft (8) is greater than a preset value, the first compensation unit (27) disconnects the first damping cavity from the liquid storage bin; the second compensation unit (28) is used for communicating the second damping cavity with the liquid storage bin; at the moment, the movable partition plate (1) is close to one side of the first damping cavity (30) relative to the initial central position, damping liquid in the first damping cavity (30) pushes the first baffle plate (14) to rotate through the first damping hole (12), so that the volume in the gas compression cavity (29) is reduced, the pressure is increased, and the force for returning to the central position is provided for the movable partition plate (1); meanwhile, damping force is generated in the process that damping liquid enters and exits the first damping hole (12), and shimmy is restrained;

when the pressure difference between the first damping cavity and the second damping cavity exceeds the opening threshold of the two-way pressure release valve, the damping liquid in the first damping cavity and the second damping cavity is communicated through the two-way pressure release valve, so that the stability and reliability of normal steering are ensured.

Technical Field

The invention belongs to the technical field of automobile wheel shimmy reduction, and particularly relates to a rotary magneto-rheological shimmy damper with a centering function.

Background

Shimmy of an automobile is one of the factors influencing the driving safety of the automobile. Shimmy is the phenomenon that when an automobile runs on a flat road surface at a certain speed, wheels continuously vibrate around a kingpin to cause the wheels to swing. This vibration is fed back to the driver-operated steering wheel through the steering system. When the magnitude of the vibration is large, the driver may not be able to immediately control the steering wheel, thereby causing the vehicle body to swing and even making the vehicle snake ahead. Shimmy is therefore very harmful to the vehicle, it deteriorates the handling stability of the vehicle, reduces the safety and reliability of the driving, and in severe cases also affects the ride comfort of the vehicle.

The reason for generating the shimmy phenomenon of the front wheel of the automobile is mainly related to a steering system, a suspension system and the wheel. The influence of the steering system on wheel shimmy is mainly embodied in the rigidity of a pull rod, the inherent damping of the system, the damping of a shock absorber, the dry friction torque of the steering system, the clearance of a steering column, a universal joint and a ball head pair and the motion interference amount of a suspension and steering; suspension systems are primarily wheel shimmy due to improper matching of springs, bushings, and shock absorbers. When the rigidity of the spring is lower, the wheel shimmy is easy to cause; the wheel alignment parameters mainly comprise a wheel toe angle, a wheel camber angle, a kingpin inclination angle and a kingpin caster angle, wherein the kingpin inclination angle and the wheel toe angle have obvious influence on wheel shimmy. The wheel assembly is mainly caused by forced shimmy at high speed of the automobile due to the fact that dynamic balance is out of tolerance. The dynamic balance out-of-tolerance of the wheel assembly is mainly caused by factors such as production and manufacturing, rim deformation, tire repair and the like. Loose mounting or wear gaps in the hub bearings can also lead to wheel shimmy. In addition, the stiffness and damping characteristic parameters of the tire also have a significant effect on the self-excited shimmy of the wheel.

At present, passive control methods are mostly adopted for effective measures aiming at shimmy of the front wheel of the automobile. The shimmy damper which is most widely applied in the market at present is a hydraulic shimmy damper. The hydraulic shimmy damper is divided into a piston type and a rotary plate type, wherein the piston type is widely applied. The piston of the piston type shimmy damper is provided with a plurality of damping holes. The cylinder of the shimmy damper is generally hinged to the axle of the vehicle, while the outer end of the connecting rod is hinged to the tie rod of the vehicle. The cylinder barrel is filled with oil, and when the front wheel deflects left and right, the outer cylinder of the damping strut forces the shimmy damper piston rod to move left and right through a connecting rod. Because the piston is provided with the small hole, the oil is forced to flow through the small hole back and forth by the left and right movement of the piston, and the liquid damping is generated. When the front wheel is operated to turn, because the deflection speed of the front wheel is lower, the moving speed of the piston is also lower, and the damping generated when oil flows through the small hole is very small, so that the turning operation of the front wheel is not influenced. When shimmy occurs, because the front wheel oscillates at a high frequency left and right, the piston moves left and right at a high speed, so that oil flows through the small hole to generate large friction damping to damp high-speed deflection of the wheel, and meanwhile, because the oil and the small hole generate a large amount of heat through friction, the shimmy capacity is converted into heat, and shimmy is weakened or eliminated through the wall of the shimmy damper cylinder. The shimmy damper of the method has poor universality, small damping working range and unadjustable damping force in working, in addition, for larger shimmy, the shimmy control is realized by reducing the throttling hole and increasing the form of the piston body, so that the volume of the shimmy damper is increased, and meanwhile, because the throttling hole is small, the faults such as blockage or failure and the like are easy to generate in long-term use.

In recent years, a rubber shimmy damper is provided, wherein hydraulic oil is not contained in the shimmy damper, the shimmy energy is dissipated only by the friction between a rubber piston and a shimmy damper cylinder barrel, but the rubber is easy to deteriorate gradually in physicochemical property and mechanical property and age quickly due to the comprehensive action of internal and external factors.

Disclosure of Invention

The damping force of the shimmy damper is not adjustable and is easy to age. The invention designs a rotary magneto-rheological shimmy damper with a centering function.

The invention relates to a rotary magneto-rheological shimmy damper with a centering function, which comprises a shell, a rotary damping module, a pressure relief compensation module, an external connection module and an angle sensor. The angle sensor detects a rotation angle of a central rotation shaft in the rotary damping module. The external connection module is connected with a central rotating shaft in the rotary damping module. The rotary damping module comprises a movable partition plate, a first fixed partition plate, a second fixed partition plate, a permanent magnet, a central rotating shaft, a first return spring, a second return spring, a liquid storage bin, a first damping hole, a second damping hole, a first baffle, a second baffle, an inflating nozzle and a two-way pressure release valve. The central rotating shaft is supported in the central position of the inner cavity of the shell; one side edge of the movable partition is fixed with the central rotating shaft. The other side edge of the movable clapboard is propped against the inner side wall of the shell;

the first fixed clapboard and the second fixed clapboard are fixed in the shell; the outer edges of the first fixed clapboard and the second fixed clapboard are propped against the inner side wall of the shell, and the inner edges of the first fixed clapboard and the second fixed clapboard are propped against the central rotating shaft; one or more first damping holes are formed in the inner side edge of each first fixed partition plate; one or more second damping holes are formed in the inner side edges of the second fixed partition plates; first baffle and second baffle all set up between first fixed baffle and the fixed baffle of second. The outside edge of the first baffle and the outside edge of the second baffle are respectively propped against the inner side wall of the shell, and the inside edges are respectively propped against the central rotating shaft. The first baffle and the second baffle and the inner cavity of the shell form a revolute pair taking the axis of the central rotating shaft as a common axis. The movable partition plate, the first baffle plate and the second baffle plate divide an inner cavity of the shell into a gas compression cavity, a first damping cavity and a second damping cavity. The gas compression chamber is between the first baffle and the second baffle. Damping liquid is arranged in the first damping cavity and the second damping cavity.

The pressure relief compensation module comprises a liquid storage tank, a first compensation unit and a second compensation unit. Damping liquid is filled in the liquid storage tank; the first compensation unit and the second compensation unit respectively control the connection and disconnection between the first damping cavity and the liquid storage tank and between the second damping cavity and the liquid storage tank.

Preferably, the first compensation unit and the second compensation unit have the same structure and respectively comprise a valve body, a compensation valve, a pressure relief valve and an on-off valve. The compensating valve, the pressure relief valve and the on-off valve are all installed on the valve body. The valve body is provided with a liquid through port communicated with the liquid storage bin. The valve core of the on-off valve corresponds to the position of the liquid through port. The one end of compensating valve and pressure-relief valve all is connected to logical liquid mouth, and the other end all is connected to corresponding first damping chamber or second damping chamber. The compensating valve and the pressure relief valve are both one-way valves, and the liquid flowing directions are opposite. An input port of the compensating valve is communicated with the liquid through port, and an output port of the compensating valve is communicated with the corresponding first damping cavity or the second damping cavity; the input port of the pressure relief valve is communicated with the corresponding first damping cavity or the second damping cavity, and the output port of the pressure relief valve is communicated with the liquid through port.

Preferably, the movable partition plate is provided with a two-way pressure relief valve; two liquid through ports of the two-way pressure relief valve are communicated with the first damping cavity and the second damping cavity.

Preferably, the housing is provided with a coil assembly. The movable clapboard is fixed with a permanent magnet. The damping fluid is magnetorheological fluid.

Preferably, the outer shell comprises an inner cylinder, an inner cylinder end cover, an outer cylinder and an outer cylinder end cover. The outer cylinder is sleeved outside the inner cylinder. A gap is reserved between the inner side wall of the outer cylinder and the outer side wall of the inner cylinder; the coil assembly is disposed within the gap.

Preferably, the rotary damping module further comprises a first return spring and a second return spring. And one ends of the first return spring and the second return spring are fixed with the central rotating shaft, and the other ends of the first return spring and the second return spring are respectively fixed with the first baffle and the second baffle.

Preferably, the housing is fixed to the axle. The external connection module comprises a connecting rod and a ball hinge. The outer end of a central rotating shaft in the rotary damping module is connected with one end of a connecting rod through a ball hinge; the other end of the connecting rod is connected with a steering tie rod of the vehicle through a ball hinge.

Preferably, the inner cylinder end cover is provided with an arc chute at a part between the first fixed partition plate and the second fixed partition plate. The two ends of the inner side edges of the first baffle plate and the second baffle plate are provided with convex blocks; the first baffle and the second baffle are rotatably connected with the arc chute on the end cover of the inner barrel through the protruding block.

Preferably, the first fixed partition and the second fixed partition form an acute angle. And a charging connector is arranged at the position of the side surface of the shell corresponding to the gas compression cavity.

The pendulum reducing method of the movable partition plate rotary type magneto-rheological pendulum reducer with the centering function comprises the following specific steps:

when the front wheel of the automobile generates shimmy, the vibration is transmitted to the central rotating shaft through the external connecting module to drive the movable partition plate on the central rotating shaft to rotate.

When the angle sensor detects that the movable partition plate is close to one side of the second damping cavity relative to the initial center position and the rotating speed of the central rotating shaft is greater than a preset value, the second compensation unit disconnects the second damping cavity from the liquid storage bin; the first compensation unit is communicated with the first damping cavity and the liquid storage bin. At the moment, the movable partition plate is close to one side of the second damping cavity relative to the initial central position, and damping liquid in the second damping cavity pushes the second baffle plate to rotate through the second damping hole, so that the volume in the gas compression cavity is reduced, the pressure is increased, and the force for returning to the central position is provided for the movable partition plate; meanwhile, damping force is generated in the process that the damping liquid enters and exits the second damping hole, and shimmy is restrained.

When the angle sensor detects that the movable partition plate is close to one side of the first damping cavity relative to the initial center position and the rotating speed of the central rotating shaft is greater than a preset value, the first compensation unit disconnects the first damping cavity from the liquid storage bin; the second compensation unit is communicated with the second damping cavity and the liquid storage bin. At the moment, the movable partition plate is close to one side of the first damping cavity relative to the initial central position, damping liquid in the first damping cavity pushes the first baffle plate to rotate through the first damping hole, so that the volume in the gas compression cavity is reduced, the pressure is increased, and the force for returning to the central position is provided for the movable partition plate; meanwhile, damping force is generated in the process that the damping liquid enters and exits the first damping hole, and shimmy is restrained.

When the pressure difference between the first damping cavity and the second damping cavity exceeds the opening threshold of the two-way pressure release valve, the damping liquid in the first damping cavity and the second damping cavity is communicated through the two-way pressure release valve, so that the stability and reliability of normal steering are ensured.

The invention has the beneficial effects that:

1. according to the invention, the on-off of the two compensation units is dynamically controlled by detecting the position of the movable partition plate through the angle sensor, so that the return thrust is provided for the wheel, the deflection of the wheel under the influence of shimmy can be effectively inhibited, and the driving safety is improved. In addition, the present invention provides a coil spring on the central rotating shaft. On one hand, when the gas in the inner space formed by the baffle and the inner cylinder is compressed, the baffle on the other side is prevented from moving, so that the gas is not compressed thoroughly; on the other hand, when the high-pressure gas pushes back the baffle, the blade can be quickly returned.

2. In the working process of the invention, the damping liquid passes through the damping hole for many times in the process of shimmy, and the shimmy can be effectively inhibited.

3. According to the invention, the coil is arranged on the outer side of the shell, and the viscosity of the magnetorheological fluid is adjusted through the induced current generated in the coil when the partition plate moves, so that the dynamic adjustment of the damping force according to the shimmy intensity is realized.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic view of the combination of the end cap, the fixed partition plate and the baffle plate of the inner cylinder in the present invention;

FIG. 4 is a schematic view of the combination of the inner barrel end cap, baffle and central rotating shaft of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, a rotary magnetorheological shimmy damper with a centering function comprises a shell i, a rotary damping module ii, a pressure relief compensation module iii, an external connection module iv and an angle sensor (not shown in the figure). The shell I is fixed on the axle. The external connection module iv comprises a connection bar 23 and a ball hinge 24. The outer end of the central rotating shaft 8 in the rotary damping module is connected with one end of a connecting rod 23 through a ball hinge 24; the other end of the connecting rod 23 is connected to a tie rod of the vehicle through a ball hinge. The angle sensor adopts an absolute encoder and is installed on the shell, and the input shaft is fixed with the central rotating shaft 8 in the rotary damping module II, so that the current angle of the central rotating shaft 8 can be detected. Since the central rotation shaft 8 and the tie rods of the vehicle constitute a spatial four-bar mechanism, the steering angle of the wheels can be computationally determined by the current angle of the central rotation shaft 8.

The shell comprises an inner cylinder 2, an inner cylinder end cover 3, an outer cylinder 4, an outer cylinder end cover 5 and a coil assembly 6. The outer cylinder 4 is sleeved outside the inner cylinder 2. A gap is reserved between the inner side wall of the outer cylinder 4 and the outer side wall of the inner cylinder 2; the coil assembly 6 is disposed in the gap; the size of the magnetic field in the inner cylinder 2 can be adjusted by adjusting the current passing through the coil assembly 6. Both ends of the inner cylinder 2 are sealed by inner cylinder end covers 3; both ends of the outer cylinder 4 are sealed by an annular outer cylinder end cover 5; the inner cylinder 2 and the inner cylinder end cover 3 are made of materials resistant to oil corrosion; the outer cylinder 4 and the outer cylinder end cover 5 are made of insulating materials.

As shown in fig. 2, 3 and 4, the rotary damping module ii includes a movable partition plate 1, a first fixed partition plate 21, a second fixed partition plate 22, a permanent magnet 7, a central rotating shaft 8, a first return spring 9, a second return spring 10, a liquid storage bin 11, a first damping hole 12, a second damping hole 13, a first baffle plate 14, a second baffle plate 15, an air charging nozzle 16 and a two-way pressure relief valve 26. The central rotating shaft 8 is supported at the central position of the inner cavity of the inner cylinder 2; one side edge of the movable partition board 1 is fixed with the central rotating shaft 8. The edge of the other side of the movable clapboard 1 props against the inner side wall of the inner cylinder 2; the movable partition 1 can be turned over with the rotation of the central rotating shaft 8. Permanent magnets 7 are arranged in the interlayer of the inner side of the moving diaphragm 1.

The first fixed clapboard 21 and the second fixed clapboard 22 are both fixed on the inner cylinder 2; the outer edges of the first fixed clapboard 21 and the second fixed clapboard 22 are propped against the inner side wall of the inner cylinder 2, and the inner edges are propped against the central rotating shaft 8; the first fixed partition 21 makes an acute angle with the second fixed partition 22. A plurality of first damping holes 12 are formed in the inner side edges of the first fixed partition plates 21; a plurality of second damping holes 13 are formed in the inner side edges of the second fixed partition plates 22; the first baffle 14 and the second baffle 15 are both disposed between the first fixed partition 21 and the second fixed partition 22. The first baffle plate 14 is positioned on one side close to the first fixed baffle plate 21; the second baffle 15 is positioned at one side close to the second fixed baffle 22; the outer edges of the first baffle plate 14 and the second baffle plate 15 are respectively propped against the inner side wall of the inner cylinder 2, and the inner edges are respectively propped against the central rotating shaft 8. An arc chute 25 is arranged on the inner cylinder end cover 3 between the first fixed clapboard 21 and the second fixed clapboard 22. The two ends of the inner side edges of the first baffle plate 14 and the second baffle plate 15 are provided with convex blocks; the first baffle plate 14 and the second baffle plate 15 are rotatably connected with an arc chute 25 on the inner cylinder end cover 3 through a convex block. One ends of the first return spring 9 and the second return spring 10 are fixed with the central rotating shaft 8, and the other ends of the first return spring and the second return spring are respectively fixed with the first baffle plate 14 and the second baffle plate 15 and used for assisting the quick centering of the movable partition plate 1 in shimmy.

The movable diaphragm 1, the first baffle 14 and the second baffle 15 divide the inner cavity of the inner cylinder 2 into a gas compression chamber 29, a first damper chamber 30 and a second damper chamber 31. The gas compression chamber 29 is between the first baffle 14 and the second baffle 15. The volume of the gas compression chamber 29 changes as the first shutter 14 and the second shutter 15 rotate. Magnetorheological damping fluid is arranged in the first damping cavity 30 and the second damping cavity 31. When the movable partition board 1 rotates, the magnetorheological damping fluid in the first damping cavity 30 and the magnetorheological damping fluid in the second damping cavity 31 can respectively extrude the space of the gas compression cavity 29 through the first damping hole 12 in the first fixed partition board 21 and the second damping hole 13 in the second fixed partition board 22. A charging connector 16 is provided at a position on the side of the inner cylinder 2 corresponding to the gas compression chamber 29 for adjusting the initial pressure in the gas compression chamber 29. A bidirectional pressure relief valve 26 is arranged on the movable partition plate 1; two fluid communication ports of the two-way relief valve 26 communicate with the first damping chamber 30 and the second damping chamber 31. When the pressure difference between the first damping chamber 30 and the second damping chamber 31 exceeds the pressure threshold value defined by the two-way pressure relief valve 26, the two-way pressure relief valve 26 is opened, so that the situation that the wheels are limited to steering by the shimmy damper when the vehicle is normally steered is avoided.

The pressure relief compensation module iii comprises a reservoir 11, a first compensation unit 27 and a second compensation unit 28. The liquid storage tank 11 is welded and fixed on the outer side of the outer cylinder 4. The first compensation unit 27 and the second compensation unit 28 have the same structure and are respectively arranged outside the first damping cavity 30 and the second damping cavity 31.

The first compensating unit 27 and the second compensating unit 28 have the same structure and each include a valve body, a compensating valve 17, a pressure relief valve 18, and an on-off valve 19. The valve body is made of insulating materials. The compensation valve 17, the pressure relief valve 18 and the on-off valve 19 are all mounted on the valve body. The valve body is provided with a liquid through port 20 communicated with the liquid storage bin 11. The valve core of the on-off valve 19 controls the blockage or the conduction of the liquid through port 20 through the on-off of the electromagnet. The compensating valve 17 and the pressure relief valve 18 both adopt one-way valves, and the liquid flowing directions are opposite. The input port of the compensating valve 17 is communicated with the liquid through port 20, and the output port is communicated with the corresponding first damping cavity 30 or the second damping cavity 31; the input port of the pressure relief valve 18 is communicated with the corresponding first damping cavity 30 or second damping cavity 31, and the output port is communicated with the liquid through port 20;

magnetorheological damping fluid is filled in the liquid storage bin 11; when the on-off valve 19 is powered off and the liquid inlet 20 is opened, when the oil pressure of the corresponding damping cavity becomes high, the high oil pressure will push the pressure relief valve 18 open to enter the liquid storage bin 11; when the oil pressure of the corresponding damping cavity is insufficient, the hydraulic oil in the liquid storage bin 11 can jack the compensating valve 17 to enter the inner cylinder 2. In the initial state, the on-off valve 19 in both the first 27 and the second 28 compensating unit is in the de-energized state.

The working principle of the rotary magneto-rheological shimmy damper with the centering function is as follows:

when the front wheel of the automobile shimmys, the vibration is transmitted to the central rotating shaft 8 through the connecting rod 23 to drive the central rotating shaft 8 to rotate, and the central rotating shaft 8 drives the movable partition board 1 to rotate.

When the angle sensor detects that the movable partition plate 1 is close to one side of the second damping cavity 31 relative to the initial center position and the rotating speed of the central rotating shaft 8 is greater than the preset value, the controller controls the on-off valve 19 in the second compensation unit 28 to be electrified to close the liquid through port 20, and the on-off valve 19 in the first compensation unit 27 is electrified to open the liquid through port 20. At this time, the movable partition plate 1 is close to one side of the second damping cavity 31 relative to the initial central position, the damping liquid in the second damping cavity 31 is pushed to the second damping hole 13, and the damping liquid pushes the second baffle plate 15 to rotate anticlockwise, so that the volume in the gas compression cavity 29 is reduced; the gas in the gas compression cavity 29 is compressed to become high-pressure gas, the high pressure of the high-pressure gas pushes the second baffle 15 to rotate clockwise, the second baffle 15 discharges the magnetorheological damping liquid which enters the second damping hole 13 before back to the second damping cavity 31, and the magnetorheological damping liquid generates damping force in the process of entering and exiting the second damping hole 13, so that the shimmy suppression effect is more obvious. When the magneto-rheological damping fluid works, the first return spring 9 is stretched, so that the first baffle plate 14 is tightly attached to the first fixed partition plate 21 to block the first damping hole 12. The second return spring 10 is compressed. Therefore, the second baffle 15 rotates clockwise under the action of the second return spring 10, so that the movable partition plate 1 returns to the original position quickly, and the centering speed is further increased. In the process, the first damping cavity 30 is directly communicated with the liquid storage bin 11 through the first compensation unit 27, so that the first damping cavity 30 automatically supplies liquid from the liquid storage bin 11 or discharges liquid into the liquid storage bin 11 along with the movement of the movable partition plate 1, and the pressure is kept stable.

Similarly, when the angle sensor detects that the movable partition plate 1 is close to one side of the first damping chamber 30 relative to the initial center position and the rotating speed of the central rotating shaft 8 is greater than the preset value, the controller controls the on-off valve 19 in the first compensation unit 27 to be powered on to close the liquid inlet 20, and controls the on-off valve 19 in the second compensation unit 28 to be powered off to open the liquid inlet 20. At this moment, the movable partition plate 1 is close to one side of the first damping cavity 30 relative to the initial central position, after the magnetorheological damping fluid in the first damping cavity 30 passes through the first damping hole 12, the movable partition plate 1 pushes the first baffle plate 14 to rotate clockwise, so that the volume in the gas compression cavity 29 is reduced, the gas in the gas compression cavity 29 is compressed to be changed into high-pressure gas, the high pressure of the high-pressure gas pushes the first baffle plate 14 to rotate anticlockwise, the first baffle plate 14 discharges the magnetorheological damping fluid which enters the first damping hole 12 to the first damping cavity 30, and the magnetorheological damping fluid generates damping force in the process of entering the first damping hole 12, so that the shimmy suppression effect is more obvious. When the magnetorheological damping fluid works, the second return spring 10 is stretched, so that the second baffle plate 15 is tightly attached to the second fixed baffle plate 22 to block the second damping hole 13. The first return spring 9 is compressed. Therefore, the first baffle 14 rotates counterclockwise under the action of the first return spring 9 to quickly return the movable partition board 1 to the original position, thereby further accelerating the centering speed. In the process, the second damping cavity 31 is directly communicated with the liquid storage bin 11 through the second compensation unit 28, so that the second damping cavity 31 automatically supplies liquid from the liquid storage bin 11 or discharges liquid into the liquid storage bin 11 along with the movement of the movable partition plate 1, and the pressure is kept stable.

In the moving process of the permanent magnet 7 in the movable partition plate 1, the magnetic field changes, so that the coil group 6 cuts the magnetic induction lines to generate current, the viscosity of the magnetorheological damping fluid is increased, the higher the rotating speed of the movable partition plate 1 is, the higher the viscosity of the magnetorheological damping fluid is, the dynamic adjustment is performed on the damping force according to the intensity of shimmy, and the shimmy is effectively inhibited.

It is worth to be noted that when the automobile normally turns, the wheel turning amplitude is larger than the wheel shimmy amplitude, so that when the wheel drives the shimmy damper moving partition plate 1 to rotate anticlockwise, the rotation degree is larger than that of the wheel shimmy, at the moment, the magneto-rheological damping liquid slowly enters the damping hole 13 to push the baffle plate 15, and the degree is correspondingly increased, so that the pressure in the gas compression cavity 29 is increased; when the pressure of the gas compression cavity 29 reaches the opening threshold of the two-way pressure relief valve 26, the two-way pressure relief valve 26 is opened, and the first damping cavity 30 is communicated with the second damping cavity 31, so that the central rotating shaft 8 can continue to rotate, and the situation that the shimmy damper blocks the normal steering of the vehicle is avoided.