CN109695656B - Zero negative damping magneto-rheological shock absorber - Google Patents
Zero negative damping magneto-rheological shock absorber Download PDFInfo
- Publication number
- CN109695656B CN109695656B CN201910073500.0A CN201910073500A CN109695656B CN 109695656 B CN109695656 B CN 109695656B CN 201910073500 A CN201910073500 A CN 201910073500A CN 109695656 B CN109695656 B CN 109695656B
- Authority
- CN
- China
- Prior art keywords
- piston
- contact
- piston rod
- damping
- slider
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention particularly discloses a zero negative damping magnetorheological damper, which comprises a working cylinder, wherein a working cavity is arranged in the working cylinder, and magnetorheological fluid is filled in the working cavity; the piston rod comprises a first end and a second end, the piston rod penetrates through the working cylinder, the first end is located in the working cavity, and the second end is located outside the working cavity; the piston is fixedly connected to the piston rod and located in the magnetorheological fluid, the piston is in sealed and sliding connection with the inner wall of the working cavity, and the magnetorheological fluid located on the two sides of the piston is communicated through the damping channel; the excitation coil is used for generating a magnetic field and acting on the magnetorheological fluid; the direct current power supply is electrically connected with the excitation coil; the on-off device controls the direct current power supply and the magnet exciting coil to be switched off when the movement direction of the piston is reversely changed, the damping force is 0 at the moment, the direct current power supply and the magnet exciting coil are controlled to be switched on after the piston continues to move for a period of time, and the magnetorheological fluid generates the damping force opposite to the movement direction of the piston after the switch-on device is switched on, so that the negative damping phenomenon can be effectively avoided, and the vibration reduction effect is ensured.
Description
Technical Field
The invention relates to the technical field of dampers, in particular to a zero negative damping magnetorheological shock absorber.
Background
The magneto-rheological shock absorber is a shock absorbing element with adjustable damping force. The principle that the mechanical property of the magnetorheological fluid can be controlled under the action of a magnetic field is utilized. The magnetorheological fluid is a suspension liquid with shear yield strength capable of changing along with an external magnetic field and controllable rheological property formed by dispersing fine soft magnetic particles in a carrier liquid with lower magnetic conductivity; under the action of the magnetic field, the magnetorheological fluid can realize reversible change from Newton fluid to Bingham semi-solid within millisecond time, and the original state can be recovered after the magnetic field is removed after the excitation coil is powered off.
The existing magnetorheological damper generally comprises a working cylinder, magnetorheological fluid is filled in the working cylinder, a piston is further arranged in the working cylinder, the piston is connected with a piston rod, one end of the piston rod extends out of the working cylinder and is used for being connected with an external load, the piston rod can drive the piston to relatively slide along the working cylinder in the magnetorheological fluid, an excitation coil is further arranged at the piston, and the excitation coil is selectively connected with a direct-current power supply. When the piston rod drives the piston to slide relative to the working cylinder, the magnet exciting coil is connected with the direct-current power supply, the magnet exciting coil generates a magnetic field at the moment, the magnetorheological fluid is semi-solidified, and motion resistance is provided for the piston.
Ideally, the magnetorheological damper should have low additional stiffness and negative damping characteristics. However, since the magnetorheological fluid is a viscoelastic body under the unyielding condition after being excited, the elastic property of the magnetorheological fluid is more remarkable when the speed of the piston relative to the cylinder body is lower. When the piston is reversed, the magnetorheological fluid is converted into the elastic body, residual elastic deformation exists, the elastic force is dominant in the damping force, and the direction of the damping force of the shock absorber cannot be changed at any time. Therefore, the existing magneto-rheological shock absorber has higher additional rigidity and negative damping characteristic.
Specifically, referring to fig. 1, fig. 1 shows an F-V diagram of a piston of a conventional magnetorheological fluid shock absorber during a period, where F represents a damping force provided by the magnetorheological fluid to the piston, and V represents a moving speed of the piston, and defines a direction of the piston moving upward as a positive direction, and since the damping force is required to prevent the piston from moving, the damping force takes a direction of the piston moving downward as a positive direction. When the piston is located at the point b and the point e, the movement speed of the piston reaches the maximum positive direction and the maximum negative direction, the displacement is 0 and is a balance point in the periodic movement process of the piston, when the piston is located at the point a, the speed of the piston is 0, the positive displacement of the piston reaches the maximum positive direction and starts to move in the reverse direction, when the piston is located at the point d, the speed of the piston is also 0 and the negative displacement of the piston reaches the maximum negative direction and also starts to move in the reverse direction, the point a and the point d are respectively a positive limit position and a negative limit position in the periodic movement process of the piston, and as can be seen from the graph 1, the piston reciprocates along the path of b-a-f-e-d-c-b. However, in the initial stage of changing the speed direction of the piston (which is equivalent to that when the piston is in the paths of a-f and d-c in fig. 1), the application direction of the damping force is the same as the movement direction of the piston, so that a strong negative damping characteristic is obtained, and the magnetorheological shock absorber cannot play a role in damping, but rather causes vibration enhancement, which affects the comfort of the vehicle.
Therefore, a zero negative damping magnetorheological damper is needed to solve the above problems.
Disclosure of Invention
The invention aims to: the zero negative damping magnetorheological shock absorber is provided to solve the problem that the magnetorheological shock absorber in the prior art has negative damping characteristics.
The invention provides a zero negative damping magneto-rheological shock absorber, which comprises the following components:
the working cylinder is internally provided with a working cavity, and magnetorheological fluid is filled in the working cavity;
the piston rod comprises a first end and a second end, the piston rod penetrates through the working cylinder, the first end is located in the working cavity, and the second end is located outside the working cavity;
the piston is fixedly connected to the piston rod and located in the magnetorheological fluid, the piston is in sealed and sliding connection with the inner wall of the working cavity, and the magnetorheological fluid located on the two sides of the piston is communicated through a damping channel;
the excitation coil is used for generating a magnetic field and acting on the magnetorheological fluid;
a DC power supply electrically connected to the exciting coil;
and the on-off device is used for controlling the direct current power supply to be connected with or disconnected from the excitation coil.
Preferably, the switch comprises:
a slider electrically conductive and connected to the excitation coil;
the first contact and the second contact are arranged on two sides of the sliding rotor relatively and are connected with the direct-current power supply, the piston rod can drive the sliding rotor to move between the first contact and the second contact, and the sliding rotor can be abutted against the first contact or abutted against the second contact or not contacted with the first contact and the second contact.
As a preferable scheme of the zero negative damping magnetorheological shock absorber, the on-off device further comprises a fixed seat, an accommodating cavity is formed in the fixed seat, the first contact and the second contact are both convexly arranged in the accommodating cavity, the fixed seat can conduct electricity and is connected with the direct current power supply through a lead, the distance between the first contact and the second contact is larger than the thickness of the slider, and the slider is sleeved on the piston rod.
As a preferable scheme of the zero negative damping magnetorheological shock absorber, the on-off device further comprises an insulating layer, the insulating layer wraps the outer surface of the fixing seat and is fixedly connected to the upper end of the working cylinder, and the lead penetrates through the insulating layer.
As a preferred scheme of the zero negative damping magnetorheological shock absorber, the first contact is an adjusting screw which is in threaded connection with the fixed seat.
As a preferable scheme of the zero negative damping magnetorheological damper, the piston rod drives the slider to move through a static friction force between the piston rod and the slider, and when the slider abuts against the first contact or the second contact, the first contact or the second contact can prevent the slider from moving, and the slider can slide relative to the piston rod.
As a preferred scheme of the zero negative damping magnetorheological shock absorber, a conductive sliding wire is embedded in the piston rod, the conductive sliding wire extends along the axis direction of the piston rod, and the conductive sliding wire is respectively connected with the slider and the excitation coil.
As a preferable scheme of the zero negative damping magnetorheological damper, the on-off device further comprises a wear-resistant ring, the slider is provided with an installation groove, the wear-resistant ring is located in the installation groove, the wear-resistant ring is sleeved on the piston rod, and the wear-resistant ring is respectively attached to the piston rod and the slider.
As a preferable scheme of the zero negative damping magnetorheological shock absorber, the damping channel is arranged on the piston, and the damping channel extends along the axial direction of the piston.
As a preferable scheme of the zero negative damping magnetorheological shock absorber, the excitation coil is packaged in a cavity inside the piston.
As a preferable scheme of the zero negative damping magnetorheological shock absorber, the zero negative damping magnetorheological shock absorber further comprises a controller, the direct current power supply is connected with the excitation coil through the controller, the controller is used for controlling the current input to the excitation coil from the direct current power supply, and the on-off device is used for controlling the on-off of the controller and the excitation coil.
As a preferred scheme of the zero negative damping magnetorheological shock absorber, the zero negative damping magnetorheological shock absorber further comprises a floating piston, the floating piston is fixedly sleeved on the piston rod, the floating piston is in sealed and sliding fit with the inner wall of the working cavity, the working cavity is divided into a first cavity and a second cavity by the floating piston, the magnetorheological fluid is filled in the first cavity, and the second cavity is filled with gas.
As a preferred scheme of the zero negative damping magnetorheological shock absorber, the working cylinder comprises a cylinder body and an end cover, the working cavity is arranged in the cylinder body, an opening is formed in one end of the working cavity, the end cover is arranged on the cylinder body and seals the opening, and the piston rod is sealed and penetrates through the end cover in a sliding mode.
The invention has the beneficial effects that:
the invention provides a zero negative damping magnetorheological damper, which is characterized in that an on-off device is arranged between a direct current power supply and an excitation coil, the on-off device can control the connection or disconnection of the direct current power supply and the excitation coil, when the direct current power supply is connected with the excitation coil, the excitation coil generates a magnetic field and acts on magnetorheological fluid, the magnetorheological fluid becomes semi-solid, when a piston moves, the piston extrudes the magnetorheological fluid in sequence to pass through a damping channel and enter the other side, and the magnetorheological fluid generates acting force on the piston when passing through the damping channel. Specifically, when the movement direction of the piston is reversely changed, the on-off device controls the direct-current power supply and the magnet exciting coil to be switched off, so that the magneto-rheological fluid does not provide damping force, after the piston continues to move for a period of time, the on-off device controls the direct-current power supply and the magnet exciting coil to be switched on, and the time control is that after the on-off device controls the direct-current power supply and the magnet exciting coil to be switched on, the magnetic field provided by the magnet exciting coil can enable the magneto-rheological fluid to generate damping force opposite to the movement direction of the piston, so that the problem that the magneto-rheological damper has.
Drawings
FIG. 1 is an F-V view of a piston of a prior art magnetorheological shock absorber;
FIG. 2 is a schematic structural diagram of a zero negative damping magnetorheological shock absorber in an embodiment of the invention;
FIG. 3 is an enlarged schematic view of the zero negative damping magnetorheological shock absorber A of FIG. 2;
FIG. 4 is an enlarged schematic view of the zero negative damping magnetorheological shock absorber B of FIG. 2;
FIG. 5 is a F-V diagram of a piston of a zero negative damping magnetorheological shock absorber in an embodiment of the invention.
In the figure:
1. a working cylinder; 11. a first chamber; 12. a second chamber; 13. a cylinder body; 14. an end cap; 2. a piston rod; 3. A piston; 31. a damping channel; 4. a field coil; 5. a direct current power supply; 6. a controller; 7. an on-off device; 71. A fixed seat; 72. a slider; 73. a first contact; 74. a second contact; 75. an insulating layer; 76. wear-resistant rings; 8. a conductive smooth wire; 9. magnetorheological fluid; 10. a floating piston; 20. positive electrode wiring; 30. and a negative electrode wiring.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 2 to 4, the present embodiment provides a zero negative damping magnetorheological shock absorber, which includes a working cylinder 1, a piston rod 2, a piston 3, an excitation coil 4, a dc power supply 5 and an on-off device 7. A working cavity is arranged in the working cylinder 1, magnetorheological fluid 9 is filled in the working cavity, the piston rod 2 comprises a first end and a second end, the piston rod 2 penetrates through the working cylinder 1, the first end is located in the working cavity, and the second end is located outside the working cavity; the piston 3 is fixedly connected to the piston rod 2 and is positioned in the magnetorheological fluid 9, the piston 3 is in sealing and sliding connection with the inner wall of the working cavity, and the magnetorheological fluids 9 positioned on two sides of the piston 3 are communicated through the damping channel 31; the excitation coil 4 is used for generating a magnetic field and acting on the magnetorheological fluid 9; a DC power supply 5 electrically connected to the excitation coil 4; and an on-off device 7 for controlling the direct current power supply 5 to be connected to or disconnected from the exciting coil 4. When the movement direction of the piston 3 is reversely changed, the on-off device 7 controls the direct current power supply 5 and the excitation coil 4 to be switched off, so that the magnetorheological fluid 9 does not provide damping force, after the piston 3 continues to move for a period of time, the on-off device 7 controls the direct current power supply 5 and the excitation coil 4 to be switched on, and the switching-off time is controlled after the direct current power supply 5 and the excitation coil 4 are controlled to be switched on by the on-off device 7, so that the magnetic field provided by the excitation coil 4 can enable the magnetorheological fluid 9 to generate damping force opposite to the movement direction of the piston 3 on the piston 3, the problem that the magnetorheological damper has negative damping in the prior art can
Specifically, the working cylinder 1 includes a cylinder body 13 and an end cover 14, the working chamber is disposed in the cylinder body 13, an opening is disposed at one end of the top of the working chamber, the end cover 14 covers the cylinder body 13 and seals the opening, and the piston rod 2 penetrates through the end cover 14. When in use, the second ends of the working cylinder 1 and the piston rod 2 are respectively used for connecting a wheel and a suspension or a suspension and a vehicle body.
The zero negative damping magnetorheological shock absorber further comprises a floating piston 10, the floating piston 10 is fixedly connected to the piston rod 2, the floating piston 10 is in sealing and sliding fit with the inner wall of the working cavity, the floating piston 10 can follow the piston rod 2, and the floating piston 10 is close to the opening relative to the piston 3 along the axial direction of the piston rod 2. In this embodiment, the floating piston 10 divides the working chamber into a first chamber 11 and a second chamber 12, the piston 3 divides the second chamber 12 into an upper chamber and a lower chamber, the upper chamber and the lower chamber are communicated through a damping channel 31, the magnetorheological fluid 9 is filled in the first chamber 11, namely, the upper chamber and the lower chamber, and the second chamber 12 is filled with gas. Specifically, the magnetorheological fluid 9 fills the upper chamber and the lower chamber, and the gas in the second chamber 12 is nitrogen, and in other embodiments, the nitrogen may be other gases. When the piston rod 2 moves upwards, the floating piston 10 compresses the nitrogen in the second cavity 12, the piston 3 compresses the upper cavity, and the magnetorheological fluid 9 in the upper cavity moves towards the lower cavity through the damping channel 31.
In this embodiment, the damping channel 31 and the excitation coil 4 are both disposed on the piston 3, two ends of the damping channel 31 are communicated with spaces on two sides of the piston 3, and the magnetorheological fluid 9 on two sides of the piston 3 is communicated through the damping channel 31. Preferably, the damping channel 31 extends in the axial direction of the piston rod 2. Of course, in other embodiments, the damping passage 31 and the exciting coil 4 may also be provided on the side wall of the cylinder block 13.
The on-off switch 7 includes a fixed base 71, a slider 72, a first contact 73, a second contact 74, and an insulating layer 75. The slider 72 is electrically conductive and connected to the excitation coil 4; first contact 73 and second contact 74 set up in the both sides of slider 72 relatively and all be connected with DC power supply 5, and piston rod 2 can drive slider 72 and move between first contact 73 and second contact 74, and slider 72 can butt with first contact 73, or butt with second contact 74, or all do not contact with first contact 73 and second contact 74. When the slider 72 is in contact with the first contact 73 or the second contact 74, the dc power supply 5 is connected to the exciting coil 4, and at this time, a damping force is generated, and when the slider 72 is not in contact with the first contact 73 or the second contact 74, the dc power supply 5 is disconnected from the exciting coil 4, and at this time, no damping force is generated.
Specifically, the fixing seat 71 is provided inside with an accommodating cavity, the fixing seat 71 is sleeved on the piston rod 2 and does not contact with the piston rod 2, the first contact 73 and the second contact 74 are both convexly provided on the accommodating cavity, and the fixing seat 71 can be electrically conductive and is connected with the dc power supply 5 through a wire. The insulating layer 75 is wrapped on the outer surface of the fixing base 71 and fixedly mounted on the upper surface of the end cover 14, the conducting wire passes through the insulating layer 75, and the insulating layer 75 is used for preventing the electric leakage of the fixing base 71. The slider 72 is sleeved on the piston rod 2 and located in the accommodating cavity, and a distance between the first contact 73 and the second contact 74 is larger than a thickness of the slider 72 and is oppositely disposed with respect to the slider 72, so that the slider 72 can selectively abut against or not abut against the first contact 73 or the second contact 74.
In this embodiment, the slider 72 is sleeved on the piston rod 2, the piston rod 2 can drive the slider 72 to move by the static friction force, and when the piston rod 2 drives the slider 72 to abut against the first contact 73 or the second contact 74, the slider 72 does not move along with the piston rod 2 continuing to move in the same direction, and the force applied to the slider 72 by the first contact 73 or the second contact 74 can overcome the maximum static friction force between the slider 72 and the piston rod 2, and the slider 72 can slide relative to the piston rod 2. Therefore, when the slider 72 is in contact with the first contact 73 or the second contact 74, the dc power supply 5 is connected to the excitation coil 4, when the slider 72 is separated from the first contact 73 or the second contact 74, the dc power supply 5 is disconnected from the excitation coil 4, and when the piston 3 moves to the maximum displacement (positive and negative limit positions of the piston 3), the slider 72 is in contact with the corresponding contact, and when the moving direction of the piston 3 is reversed, the piston rod 2 drives the slider 72 to be directly separated from the corresponding contact, so that the dc power supply 5 is disconnected from the excitation coil 4. By controlling the spacing between the first contacts 73 or the second contacts 74 and the thickness of the slider 72, the time at which the slider 72 is separated from the first contacts 73 or the second contacts 74 can be effectively controlled. It should be noted that, in order to enable the slider 72 to contact the first contact 73 or the second contact 74, the magnetic field provided by the exciting coil 4 can enable the magnetorheological fluid 9 to generate a damping force on the piston 3 opposite to the moving direction of the piston 3, and the damping force can be obtained by combining the F-V diagram in the prior art and through effective experiments.
In this embodiment, the slider 72 is provided with a mounting groove, the wear-resistant ring 76 is located in the mounting groove, the wear-resistant ring 76 is sleeved on the piston rod 2, the wear-resistant ring 76 is respectively attached to the piston rod 2 and the slider 72, and the static friction between the slider 72 and the piston rod 2 is increased by the wear-resistant ring 76, so as to prevent the slider 72 from sliding relatively due to insufficient static friction when the slider 72 follows the piston rod 2.
Preferably, the first contact 73 is an adjusting screw and is located above the second contact 74, the adjusting screw is screwed to the fixing seat 71, and a threaded end of the adjusting screw is located in the accommodating cavity. The distance between the two contacts can be adjusted by adjusting the length of the threaded end of the adjusting screw extending into the accommodating cavity, and the distance between the first contact 73 or the second contact 74 can be conveniently adjusted by setting the first contact 73 as the adjusting screw, namely, the time for separating the slider 72 from the first contact 73 or the second contact 74 is conveniently adjusted.
The zero negative damping magnetorheological shock absorber further comprises a controller 6, the direct current power supply 5 is connected with the excitation coil 4 through the controller 6, the controller 6 is used for controlling the current input to the excitation coil 4 by the direct current power supply 5, and the on-off device 7 is used for controlling the controller 6 to be connected with or disconnected from the excitation coil 4. The controller 6 is prior art, and no longer gives details here, can control the magnetic field intensity that the excitation coil 4 produced through the size of controller 6 control input excitation coil 4 in the electric current, and then when the piston 3 moved in magnetorheological suspensions 9, can control the damping force size that magnetorheological suspensions 9 produced to the piston 3.
And a conductive sliding wire 8 is also embedded in the piston rod 2, and the conductive sliding wire 8 is matched with a lead to connect the controller 6, the on-off device 7 and the excitation coil 4 into a control loop. In this embodiment, the conductive sliding wire 8 extends along the axial direction of the piston rod 2, and during the up-and-down movement of the piston rod 2, the conductive sliding wire 8 can be continuously connected with the slider 72 and the excitation coil 4, respectively, the first contact 73 and the second contact 74 are connected with the controller 6 through wires, and the controller 6 is connected with the excitation coil 4 through wires. Further, the conductive sliding wire 8 and the excitation coil 4 are connected by a lead wire, and the conductive sliding wire 8 and the slider 72 may be connected by a lead wire or may be continuously attached. Preferably, the inside of piston rod 2 is equipped with the wire casing, and the wire that excitation coil 4 and electrically conductive smooth silk 8 are connected to and the wire that excitation coil 4 and controller 6 are connected evenly arranges in the wire casing.
Specifically, the controller 6 is connected to the positive electrode and the negative electrode of the dc power supply 5 through the positive electrode connection 20 and the negative electrode connection 30, the controller 6 is connected to the fixing base 71 through the positive electrode connection 20, the conductive sliding wire 8 is also connected to the excitation coil 4 through the positive electrode connection 20, and the excitation coil 4 is connected to the controller 6 through the negative electrode connection 30.
Referring to fig. 5, fig. 5 shows an F-V view of the piston 3 in one movement cycle of the present embodiment, wherein F represents the damping force provided by the magnetorheological fluid 9 to the piston 3, V represents the movement speed of the piston 3, and a, b, c, d, e, F, and o are a plurality of status points of the piston 3 in the movement cycle. Defining the piston 3 to be in the positive direction of upward movement, the damping force is in the positive direction of downward movement since the damping force provided by the magnetorheological fluid 9 is required to prevent the piston 3 from moving. When the piston 3 is located at the point b, the speed of the piston 3 reaches the maximum forward direction, and the displacement of the piston 3 is 0 at the moment, and the piston 3 passes through the balance point along the upward direction; when the piston 3 passes through the point a, the speed of the piston 3 is 0, and the piston 3 is located at the maximum positive displacement, namely the piston 3 is located at the positive limit position; when the piston 3 is located at the point e, the speed of the piston 3 reaches the maximum negative direction, and the displacement of the piston 3 is 0 at the time, the piston 3 passes through the balance point along the downward direction; when the piston 3 passes the point d, the speed of the piston 3 is also 0, and the piston 3 is at the maximum negative displacement, i.e., the piston 3 is at the negative limit position. It will be appreciated that when the piston 3 is in different movement periods, the negative and positive limit positions of the piston 3 are different, and as damping continues, the negative and positive limit positions of the piston 3 converge towards the equilibrium position.
As can be seen from fig. 5, during damping, the piston 3 reciprocates along the path b-a-o-f-e-d-o-c-b, as analyzed in detail below:
1) when the piston 3 is located at the point b, the sliding piece 72 is in contact with the adjusting screw, the controller 6 is communicated with the excitation coil 4, the current input to the excitation coil 4 and the damping force generated by the magnetorheological fluid 9 are controlled and adjusted by the controller 6, the direction of the damping force applied to the piston 3 is opposite to the motion direction of the piston 3, and the zero negative damping magnetorheological shock absorber plays a damping role.
2) When the piston 3 is at b-a, the piston 3 is still moving upwards, but the speed of the piston 3 is gradually reduced. In the process, the piston 3 drives the piston rod 2 to still move upwards, the sliding rotor 72 is still contacted with the adjusting screw above the fixed seat 71, the sliding rotor 72 is static relative to the adjusting screw and is in sliding fit with the piston rod 2, the current input to the magnet exciting coil 4 and the damping force generated by the magnetorheological fluid 9 are controlled and adjusted by the controller 6, the direction of the damping force applied to the piston 3 is opposite to the moving direction of the piston 3, and the zero negative damping magnetorheological shock absorber plays a damping role.
3) When the piston 3 is located at the point a, the speed of the piston 3 is 0, when the piston 3 crosses the point a, the piston 3 starts to reverse and starts to move downwards, at the moment, the speed of the piston 3 is a negative value, the sliding rotor 72 moves downwards along with the piston rod, so that the sliding rotor 72 is separated from the adjusting screw, a passage between the controller 6 and the magnet exciting coil 4 is cut off, the magnet exciting coil 4 is de-energized, and the damping force returns to the point o.
4) When the piston 3 continues to move along the o-f path, the slider 72 follows the piston rod 2 and continues to move downward, and the slider 72 gradually approaches the second contact 74. In this process, the passage between the controller 6 and the exciting coil 4 is still in the cut-off state, and the damping force is 0.
5) When the piston 3 moves to the point f, the slider 72 just contacts with the second contact 74 on the fixed seat 71, the passage between the controller 6 and the excitation coil 4 is conducted again, the excitation coil 4 is electrified, and the magnitude of the current input to the excitation coil 4 and the damping force generated by the magnetorheological fluid 9 are controlled and adjusted by the controller 6.
6) When the piston 3 continues to move along the f-e path, the path between the controller 6 and the field coil 4 remains open, and the damping force remains controlled by the controller 6. Because the slider 72 is abutted with the second contact 74 and the piston rod 2 continues to move downwards, the slider 72 is static relative to the second contact 74 and slides relative to the piston rod 2, and the direction of the damping force applied to the piston 3 is opposite to the movement direction of the piston 3, and the zero negative damping magnetorheological shock absorber has a damping effect.
7) When the piston 3 moves to the point e, the passage between the controller 6 and the excitation coil 4 is still in a connected state, the damping force is still controlled by the controller 6, the current input to the excitation coil 4 and the damping force generated by the magnetorheological fluid 9 are controlled and adjusted by the controller 6, the direction of the damping force applied to the piston 3 is opposite to the movement direction of the piston 3, and the zero negative damping magnetorheological shock absorber has a damping effect.
8) The working process of the negative damping magnetorheological shock absorber when the piston 3 moves along the path of e-d-o-c-b is opposite to the process of the piston 3 along the path of b-a-o-f-e. During the movement of the piston 3 along the d-o-c path, the slider 72 is suspended, the path between the controller 6 and the excitation coil 4 is cut off, and the excitation coil 4 is de-energized. During the movement of the piston 3 along the c-b path, the slider 72 abuts the adjustment screw.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (11)
1. A zero negative damping magnetorheological shock absorber, comprising:
the magnetorheological fluid generator comprises a working cylinder (1), wherein a working cavity is formed in the working cylinder (1), and magnetorheological fluid (9) is filled in the working cavity;
the piston rod (2) comprises a first end and a second end, the piston rod (2) is arranged in the working cylinder (1) in a penetrating mode, the first end is located in the working cavity, and the second end is located outside the working cavity;
the piston (3) is fixedly connected to the piston rod (2) and is positioned in the magnetorheological fluid (9), the piston (3) is in sealing and sliding connection with the inner wall of the working cavity, and the magnetorheological fluid (9) positioned on two sides of the piston (3) are communicated through a damping channel (31);
an excitation coil (4) for generating a magnetic field and acting on the magnetorheological fluid (9);
a direct current power supply (5) electrically connected to the excitation coil (4);
an on-off device (7) for controlling the direct current power supply (5) to be connected to or disconnected from the exciting coil (4);
the on-off device (7) comprises:
a slider (72) that is electrically conductive and connected to the excitation coil (4);
the first contact (73) and the second contact (74) are arranged on two sides of the slider (72) relatively and are connected with the direct-current power supply (5), the piston rod (2) can drive the slider (72) to move between the first contact (73) and the second contact (74), and the slider (72) can be abutted against the first contact (73), the second contact (74) or both the first contact (73) and the second contact (74);
the piston rod (2) drives the sliding rotor (72) to move through static friction force between the piston rod and the sliding rotor (72), and when the sliding rotor (72) is abutted to the first contact (73) or the second contact (74), the first contact (73) or the second contact (74) can prevent the sliding rotor (72) from moving, and the sliding rotor (72) can slide relative to the piston rod (2).
2. The zero-negative-damping magnetorheological damper according to claim 1, wherein the on-off device (7) further comprises a fixed seat (71), an accommodating cavity is formed in the fixed seat (71), the first contact (73) and the second contact (74) are both convexly arranged in the accommodating cavity, the fixed seat (71) can conduct electricity and is connected with the direct current power supply (5) through a conducting wire, the distance between the first contact (73) and the second contact (74) is larger than the thickness of the slider (72), and the slider (72) is sleeved on the piston rod (2).
3. The zero negative damping magnetorheological damper according to claim 2, wherein the on-off device (7) further comprises an insulating layer (75), the insulating layer (75) is wrapped on the outer surface of the fixed seat (71) and fixedly connected to the upper end of the working cylinder (1), and the lead passes through the insulating layer (75).
4. The zero negative damping magnetorheological damper of claim 2, wherein the first contact (73) is an adjustment screw that is threaded to the fixed seat (71).
5. The zero-negative-damping magnetorheological damper according to claim 1, wherein a conductive sliding wire (8) is embedded in the piston rod (2), the conductive sliding wire (8) extends along the axial direction of the piston rod (2), and the conductive sliding wire (8) is respectively connected with the slider (72) and the excitation coil (4).
6. The zero negative damping magnetorheological damper according to claim 1, wherein the on-off device (7) further comprises a wear-resistant ring (76), the slider (72) is provided with an installation groove, the wear-resistant ring (76) is located in the installation groove, the wear-resistant ring (76) is sleeved on the piston rod (2), and the wear-resistant ring (76) is respectively attached to the piston rod (2) and the slider (72).
7. The zero negative damping magnetorheological shock absorber of claim 1, wherein the damping channel (31) is provided on the piston (3) and the damping channel (31) extends in the axial direction of the piston (3).
8. The zero negative damping magnetorheological shock absorber of claim 1, wherein the excitation coil (4) is encapsulated in a cavity inside the piston (3).
9. The zero-negative-damping magnetorheological shock absorber according to claim 1, further comprising a controller (6), wherein the direct current power supply (5) is connected with the excitation coil (4) through the controller (6), the controller (6) is used for controlling the current input from the direct current power supply (5) to the excitation coil (4), and the on-off device (7) is used for controlling the controller (6) to be connected with or disconnected from the excitation coil (4).
10. The zero negative damping magnetorheological shock absorber according to claim 1, further comprising a floating piston (10), wherein the floating piston (10) is fixedly sleeved on the piston rod (2), the floating piston (10) is in sealing and sliding fit with the inner wall of the working cavity, the working cavity is divided into a first cavity (11) and a second cavity (12) by the floating piston (10), the magnetorheological fluid (9) is filled in the first cavity (11), and the second cavity (12) is filled with gas.
11. The zero negative damping magnetorheological damper according to claim 1, wherein the working cylinder (1) comprises a cylinder body (13) and an end cover (14), the working cavity is arranged in the cylinder body (13), an opening is arranged at one end of the working cavity, the end cover (14) is arranged in the cylinder body (13) in a covering mode and seals the opening, and the piston rod (2) is arranged in the end cover (14) in a sealing mode and penetrates through the end cover in a sliding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073500.0A CN109695656B (en) | 2019-01-25 | 2019-01-25 | Zero negative damping magneto-rheological shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073500.0A CN109695656B (en) | 2019-01-25 | 2019-01-25 | Zero negative damping magneto-rheological shock absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109695656A CN109695656A (en) | 2019-04-30 |
| CN109695656B true CN109695656B (en) | 2020-07-03 |
Family
ID=66234424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910073500.0A Active CN109695656B (en) | 2019-01-25 | 2019-01-25 | Zero negative damping magneto-rheological shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109695656B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111365048B (en) * | 2020-03-16 | 2021-07-20 | 连云港师范高等专科学校 | Magnetorheological fluid support anchor rod |
| CN112013072B (en) * | 2020-08-24 | 2022-01-18 | 科马智能悬架技术(青岛)有限公司 | Single-cylinder magnetorheological damper and vehicle |
| TWI789878B (en) * | 2021-08-23 | 2023-01-11 | 琦玉國際有限公司 | Shock absorbers and their cylinders with electronic switching modes |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH483714A (en) * | 1966-10-17 | 1969-12-31 | Pirelli | Timed commutator equipped with a mechanism for its association with an operating electromagnet |
| CN2089205U (en) * | 1991-04-05 | 1991-11-20 | 刘北耕 | Wall air drag delay button switch |
| CN103032510B (en) * | 2012-12-12 | 2016-06-01 | 重庆大学 | Stretching type magnetic current becomes snubber |
| CN103939517B (en) * | 2013-12-06 | 2016-05-18 | 重庆材料研究院有限公司 | The method of the anti-overbump of shock-resistant magneto-rheological |
| CN104179877B (en) * | 2014-08-26 | 2016-02-24 | 合肥工业大学 | Pure shear cut MR damper |
-
2019
- 2019-01-25 CN CN201910073500.0A patent/CN109695656B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109695656A (en) | 2019-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109695656B (en) | Zero negative damping magneto-rheological shock absorber | |
| JP6755350B2 (en) | Vibration damper | |
| CN100552256C (en) | Magnetic rheology elastic body active-passive integrated damper based on extrusion type applied force | |
| CN104776152B (en) | High-efficiency and low-power-consumption magnetorheological semi-active and active integrated vibration damping device | |
| US6981577B2 (en) | Controlling damping force shock absorber | |
| US20140346783A1 (en) | Hydraulic energy transfer | |
| CN104595412B (en) | Double-barrel structure magneto-rheological vibration damper based on flow pattern | |
| CN109611498B (en) | Bottom-mounted double-channel double-cylinder anti-settling magnetorheological damper | |
| CN109630596B (en) | Rotary type damping-adjustable silicone oil-magnetorheological torsional vibration damper | |
| CN103758911B (en) | The magnetorheological hydro pneumatic suspension orifice valve of vehicle | |
| CN108561486A (en) | A kind of novel anti-settling magnetic rheological liquid damper | |
| JP5809578B2 (en) | Suspension device | |
| CN110332275A (en) | A kind of full tunnel shear extrusion mixed mode MR damper and its control method | |
| JP2002257189A (en) | Electromagnetic suspension unit | |
| CN205260716U (en) | Magneto rheological damper with two -stage damping force output control | |
| CN113898693B (en) | Vibration damping actuator | |
| KR100204904B1 (en) | Magnetic type shock absorber for vehicle | |
| RU2084721C1 (en) | Hydraulic shock-absorber | |
| CN109578668A (en) | A kind of electromagnetic drive mechanism for hydraulic valve | |
| CN112829572B (en) | Automobile engine initiative suspension | |
| JP4552177B2 (en) | Damping force adjustable shock absorber | |
| CN113074208B (en) | Combined type magneto-rheological vibration damper | |
| CN113074210B (en) | Passive magnetorheological vibration damper | |
| CN113983116B (en) | Semi-active vibration reduction and impact resistance device based on metal rubber and magneto-rheological effect | |
| KR20080040267A (en) | Continuous damping control shock absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230802 Address after: Room 416, Pioneer Building, No.1 Changjiang Road, Jiaozhou economic and Technological Development Zone, Qingdao, Shandong 266300 Patentee after: Coma intelligent suspension technology (Qingdao) Co.,Ltd. Address before: 215222 Building 2, Suzhou Automotive Research Institute, Tsinghua University, 139 Lianyang Road, Wujiang District, Suzhou City, Jiangsu Province Patentee before: KEMA SMART SUSPENSION TECHNOLOGY (SUZHOU) Co.,Ltd. |