CN113027978A - Multi-loop asymmetric magnetorheological damper - Google Patents
Multi-loop asymmetric magnetorheological damper Download PDFInfo
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- CN113027978A CN113027978A CN202110486558.5A CN202110486558A CN113027978A CN 113027978 A CN113027978 A CN 113027978A CN 202110486558 A CN202110486558 A CN 202110486558A CN 113027978 A CN113027978 A CN 113027978A
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- piston
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- block
- magnetorheological
- cylinder
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- 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
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- 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
- F16F9/537—Magnetorheological [MR] fluid dampers specially adapted valves therefor
Abstract
The invention discloses a multi-loop asymmetric magnetorheological damper, which comprises a cylinder, a left end cover and a right end cover which are arranged at two ends of the cylinder, a piston mechanism arranged in the cylinder and a piston rod which is connected with the piston mechanism and can drive the piston mechanism to reciprocate, wherein the piston mechanism is arranged in the cylinder; the piston mechanism comprises a piston assembly, a valve plate assembly and a valve body assembly, wherein the piston assembly, the valve plate assembly and the valve body assembly are sequentially arranged along the axial direction of the cylinder from left to right; the piston rod drives the piston mechanism to reciprocate to form different magnetorheological fluid circulation loops, the magnetorheological damper of the technical scheme solves the requirements that the required damping force range is large and the required force value is different under the compression and recovery working conditions under the limited size requirement, and solves the problems that the force value of a passive vibration damper is difficult to adjust in a large range and the traditional symmetric magnetorheological vibration damper excessively depends on a control algorithm and response time when realizing asymmetric output force.
Description
Technical Field
The invention relates to the field of magneto-rheological vibration reduction, in particular to a multi-loop asymmetric magneto-rheological damper.
Background
The damping force of most of the existing symmetrical magnetorheological dampers is adjusted by controlling the magnitude of an external current, and the difference between the restoring force and the compression force is small. When the magneto-rheological damper is applied to an actual working condition, different requirements are required for the restoring force and the compressive force of the magneto-rheological damper, and the traditional symmetrical magneto-rheological damper needs to adopt extremely accurate active control and extremely high requirement on response time to meet the requirement, so that not only is the complexity of a system and the complexity of an algorithm increased, but also the cost is greatly increased; in addition, the force value adjusting range of the traditional symmetric magnetorheological damper in a limited space is limited, and the requirement of a working condition is difficult to meet.
In order to solve the problems, a multi-loop asymmetric magnetorheological damper needs to be designed, wherein the multi-loop asymmetric magnetorheological damper structurally enables the restoring force and the compression force to be different, and can increase the adjustment range of the damping force value in a limited space.
Disclosure of Invention
In view of this, in order to improve that the compression damping force and the recovery damping force of the existing passive shock absorber cannot be adjusted in a self-adaptive manner, increase the adjustment range of the damping force of the magnetorheological damper, and overcome the problem that the existing traditional symmetric automobile magnetorheological damper is extremely dependent on a control algorithm and response time when realizing asymmetric output force, the invention discloses a multi-ring-shaped asymmetric magnetorheological damper, which realizes independent controllability of the compression stroke and the recovery stroke output damping force.
A multi-loop asymmetric magneto-rheological damper comprises a cylinder, a left end cover and a right end cover which are arranged at two ends of the cylinder, a piston mechanism arranged in the cylinder and a piston rod which is connected with the piston mechanism and can drive the piston mechanism to reciprocate; the piston mechanism comprises a piston assembly, a valve plate assembly and a valve body assembly, wherein the piston assembly, the valve plate assembly and the valve body assembly are sequentially arranged along the axial direction of the cylinder from left to right; the piston rod drives the piston mechanism to reciprocate so as to form different magnetorheological fluid circulation loops.
Further, the piston assembly comprises a piston outer sleeve, a piston block arranged in the piston outer sleeve and a piston stop block arranged at the left end of the piston outer sleeve; permanent magnets are arranged in the circumferential direction of the piston block; the permanent magnet is wound with an excitation coil; the piston outer sleeve is provided with a magnetism isolating ring in the circumferential direction; the magnet exciting coil is arranged between the permanent magnet and the magnetism isolating ring.
Further, be provided with the installation annular that is used for installing the permanent magnet on the piston piece circumferencial direction, set up a plurality of axial piston constant through holes that run through the piston piece on the piston piece, be formed with the first circulation passageway that is used for magnetorheological suspensions to flow between piston piece and the outer sleeve of piston.
Further, the diameter of the outer piston sleeve is smaller than the inner diameter of the cylinder, and a second circulation channel for flowing the magnetorheological fluid is formed between the outer piston sleeve and the cylinder.
Further, the valve block subassembly includes valve block and compression spring, but valve block diameter the same with the outer sleeve diameter of piston and valve block endwise slip arrange in piston block right-hand member face, be provided with valve block hole and arc hole on the valve block, the valve block hole is in same axis direction with piston constant through-hole, and the arc hole is in same axis direction with first circulation passageway.
Further, the piston block is in threaded connection with the piston rod, and the piston rod axially penetrates through the piston block and is in threaded connection with the valve body assembly.
Further, the valve body assembly comprises a left valve cover, a right valve cover, a valve core arranged between the two valve covers and an outer ring cylinder sleeved on the valve core and matched with the two valve covers; the valve core protrudes leftwards along the axis direction to form a guide mounting part which is used for being mounted with the piston block in a matching way; the guide installation portion is hollow structure and the piston rod is installed in the guide installation portion through threaded connection, the valve block can follow guide installation portion axial direction reciprocating sliding, the compression spring overcoat is arranged between valve block and left valve gap in guide installation portion and compression spring.
Furthermore, the valve core is fixedly connected with the left valve cover and the right valve cover, and two ends of the outer ring cylinder are provided with positioning steps for mounting the left valve cover and the right valve cover; the valve core is provided with a guide constant through hole, and the piston constant through hole and the guide constant through hole are in the same axial direction; and a third circulation channel is formed between the valve core and the outer ring cylinder.
Furthermore, a guide groove is formed in the circumferential direction of the outer ring barrel, and a guide ring is arranged between the inner wall of the guide groove and the inner wall of the barrel body.
Further, a floating piston is arranged between the valve body assembly and the right end cover, and a valve core is arranged on the right end cover.
The invention has the beneficial effects that:
in the restoration and compression processes of the magnetorheological damper, the damping force value of the piston assembly part changes the magnetic field intensity by controlling the current, and further changes the yield strength of the magnetorheological fluid in the circulation channel in the restoration or compression process to change the damping force, the restoration and compression processes can be independently controlled, the structure is simple, the control is easy, and the control algorithm can be greatly simplified; the difference between the restoring force and the compression force can be controlled by the valve plate, and the throttling small hole on the valve plate can enable the force value of the magneto-rheological damper to change more smoothly without sudden change; by adopting a multi-channel structure, the adjustment range of the damping force of the magneto-rheological damper can be increased in a limited space, so that the damper can be applied to more environments; the piston is provided with the permanent magnet which is a protection device of the damper, so that the magneto-rheological damper can play a role even under the condition of no current, and the failure of the device is avoided. In addition, the valve body assembly part at the right end adopts the structure the same as that of the piston assembly, but the damping force value in the restoration and compression processes is not influenced by the valve plate, and the damping force value of the valve body assembly part is independently controlled by current, so that the integral force value adjusting range of the magnetorheological damper can be further enlarged, and meanwhile, the screwing direction of the threaded connection of the valve body and the piston rod is opposite to that of the threaded connection of the piston and the piston rod, and the self-locking effect can be realized; the circumferential guide ring of the valve body assembly also plays a role in guiding.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the piston stop 52 of the present invention;
FIG. 3 is a schematic end view of a valve plate according to the present invention;
FIG. 4 is a schematic end view of the valve cartridge of the present invention;
FIG. 5 is another schematic view of the present invention.
Detailed Description
FIG. 1 is a schematic view of the overall structure of the present invention; FIG. 2 is a schematic view of the piston stop 52 of the present invention; FIG. 3 is a schematic end view of a valve plate according to the present invention; FIG. 4 is a schematic end view of the valve cartridge of the present invention; FIG. 5 is another schematic structural view of the present invention; as shown in the figure, the multi-loop asymmetric magnetorheological damper comprises a cylinder body 4, a left end cover 2 and a right end cover 15 which are arranged at two ends of the cylinder body 4, a piston mechanism arranged in the cylinder body and a piston rod 1 which is connected with the piston mechanism and can drive the piston mechanism to reciprocate; the piston mechanism comprises a piston assembly, a valve plate assembly and a valve body assembly, wherein the piston assembly, the valve plate assembly and the valve body assembly are sequentially arranged along the axial direction of the cylinder from left to right; the piston rod drives the piston mechanism to reciprocate so as to form different magnetorheological circulation loops; the magneto-rheological damper of the technical scheme solves the requirements that under the limited size requirement, the required damping force range is large and the required force value under the compression and recovery working condition is different, and solves the problems that the force value of a passive vibration damper is difficult to adjust in a large range and the traditional symmetric magneto-rheological vibration damper excessively depends on a control algorithm and response time when realizing asymmetric output force.
In this embodiment, the piston assembly includes a piston outer sleeve 51, a piston block 5 disposed in the piston outer sleeve 51, and a piston stopper 52 disposed at the left end of the piston outer sleeve 51; the piston block 5 is provided with permanent magnets 7 in the circumferential direction; the permanent magnet 7 is wound with an excitation coil; the piston outer sleeve 51 is provided with a magnetism isolating ring 6 in the circumferential direction; the excitation coil is arranged between the permanent magnet 7 and the magnetism isolating ring 6; the whole piston block 5 is of a columnar structure, a permanent magnet 7 is fixedly installed in the piston block 5 in the circumferential direction (the inner part and the outer part are shown in figure 1, the part close to the central axis of the piston block is the inner part, and the part far away from the central axis is the outer part), an excitation coil is wound on the outer circumference of the permanent magnet 7, a magnetism isolating ring 6 is arranged on the outer circumference of the piston outer sleeve 51, the magnetism isolating ring 6 is embedded in the outer circumference of the piston outer sleeve 51, a first circulation channel 20 is formed between the excitation coil and the magnetism isolating ring 6, the permanent magnet 7, the excitation coil and the magnetism isolating ring 6 are all in the same circumferential direction, the outer ring of the piston outer sleeve 51 is formed by welding a magnetic conductive material and the; the permanent magnet 7 can enable the damper to still play a part of functions under the condition of power failure, so that the damper plays a role of safety, and the whole structure is convenient for realizing the adjustment and control of the magnetorheological damper.
In this embodiment, be provided with the installation annular that is used for installing permanent magnet 7 in the piston piece 5 circumferential direction, set up a plurality of axial piston constant temperature through holes 21 that run through the piston piece on the piston piece, be formed with the first circulation passageway 20 that is used for magnetorheological suspensions to flow between piston piece 5 and the piston outer sleeve 51, be provided with a plurality of piston constant temperature through holes 21 on the piston piece 5, the magnetorheological suspensions of being convenient for flow, piston constant temperature through holes 21 design is a plurality of and a plurality of piston constant temperature through holes 21 evenly distributed on the piston piece 5.
In this embodiment, the diameter of the outer piston sleeve 51 is smaller than the inner diameter of the cylinder 4, and a second annular channel for flowing the magnetorheological fluid is formed between the outer piston sleeve 51 and the cylinder 4. A gap is arranged between the piston outer sleeve 51 and the cylinder 4, and the gap of the annular structure can allow the magnetorheological fluid to flow back and forth, so that a second annular channel of the magnetorheological fluid is formed.
In this embodiment, the valve plate assembly includes valve plate 8 and compression spring 19, but valve plate 8 diameter is the same with outer sleeve 51 diameter of piston and valve plate axial slip's arrangement in the piston block 5 right-hand member face, be provided with valve plate hole and arc hole on the valve plate 8, the valve plate hole is in same axis direction with piston constant through-hole 21, and the arc hole is in same axis direction with first circulation passageway 20. The overall length of the arcuate aperture is less than the overall length of the first circulation passage 20 in cross section in the radial direction. Piston constant through hole 21 can make the output damping of attenuator more level and smooth, also the corresponding a plurality of through-holes that are provided with on the piston dog 52, and valve block 8 can laminate completely in the terminal surface of piston outer sleeve 51 promptly, and the different setting mode of length between valve block hole and the arc hole cooperates the circulation flow who uses the realization magnetorheological suspensions of being convenient for.
In this embodiment, the piston block 5 is in threaded connection with the piston rod 1, and the piston rod 1 axially penetrates through the piston block 5 and is in threaded connection with the valve body assembly.
In this embodiment, the valve body assembly includes a left valve cover 18, a right valve cover 16, a valve core 11 disposed between the two valve covers, and an outer annular cylinder 9 externally sleeved on the valve core 11 and installed in cooperation with the two valve covers; the valve core 11 protrudes leftwards along the axial direction to form a guide mounting part which is used for being mounted with the piston block 5 in a matching way; the guide mounting part is of a hollow structure, the piston rod 1 is mounted in the guide mounting part through threaded connection, the valve plate 8 can slide in a reciprocating mode along the axial direction of the guide mounting part, the compression spring 19 is sleeved outside the guide mounting part, and the compression spring 19 is arranged between the valve plate 8 and the left valve cover 18; the left valve cover 18, the right valve cover 16 and the outer ring barrel 9 are installed in a matching way to form a cavity; piston rod 1 and direction installation department adopt threaded connection's mode cooperation installation, the direction installation department supports and holds in 5 right-hand member portions of piston piece, the trompil aperture in the middle of the valve block slightly is greater than the diameter of direction installation department, make valve block 8 can slide along direction installation department axis direction, install permanent magnet and coil on 11's the circumferential direction of case, the effective working length of whole piston mechanism can be increased in the setting of valve body subassembly, and 11's damping force does not receive valve block 8's influence, receive the control of electric current alone, can increase substantially the holistic power value adjustment scope of attenuator.
In this embodiment, the valve core 11 is fixedly connected with the left valve cover 18 and the right valve cover 16, and the two ends of the outer ring cylinder 9 are provided with positioning steps for mounting the left valve cover 18 and the right valve cover 16; the valve core 11 is provided with a guide constant through hole 17, and the piston constant through hole 21 and the guide constant through hole 17 are in the same axial direction; the diameter of the spool 11 is smaller than the inner diameter of the outer ring cylinder 9, so that a third circulation passage is formed therebetween. The guide constant-through hole 17 and the piston constant-through hole 21 on the piston block 5 have the same function, so that the output damping of the damper is smoother, the valve core 11 is fixedly connected with the left valve cover 18 and the right valve cover 16 by bolts, and the left valve cover 18 and the right valve cover 16 are arranged at the positioning step arranged at the end part of the valve core to form a whole.
In this embodiment, a guide groove is formed in the circumferential direction of the outer ring barrel 9, and a guide ring 10 is arranged between the inside of the guide groove and the inner wall of the barrel body. The guide ring 10 is embedded in a guide groove in the circumferential direction of the outer ring barrel 9 and used for guiding the whole structure.
In this embodiment, a floating piston 12 is disposed between the valve body assembly and a right end cap 15, and a valve core 13 is disposed on the right end cap. The right end cover 15 is provided with a connecting mounting seat 14 which is convenient to connect and mount with other parts, the floating slide block 12 and the valve inside 13 are used for carrying out volume compensation in the working process of the damper, a compensation structure can ensure that the magnetorheological damper does not have damping force value mutation at the turning point of compression and restoration, stable transition is realized, the equipment runs more stably, the guide sealing seat 3 is also arranged in the cylinder body 4, the piston rod 1 is guided, and meanwhile, the sealing performance in the cylinder body is enhanced.
The working principle is as follows:
the valve plate 8 is pressed against the end surface of the outer piston sleeve 51 by a compression spring. A first circular flow channel 20 and a piston constant through hole 21 are formed in the piston assembly, and a second annular channel for flowing magnetorheological fluid is formed between the piston outer sleeve 51 and the cylinder 4; the valve plate 8 opens or closes the first circulation channel 20 and the piston constant through hole 21 in the process of compressing and restoring the piston block 5, and the valve plate 8 is provided with a valve plate hole and an arc-shaped hole which play a role in throttling when the damper works.
During compression movement, under the action of liquid pressure and spring force, the valve plate 8 is tightly attached to the right side of the piston outer sleeve 51, at the moment, magnetorheological fluid flows from a right side chamber to a left side chamber, passes through the guide constant through hole 17 and the third circulation channel in the valve body assembly, passes through the first circulation channel 20, the second circulation channel and the piston constant through hole 21 in the piston block 5, and at the moment, due to the throttling effect of the valve plate 8, only part of the first circulation channel 20 and the piston constant through hole 21 are used.
During the return movement, the valve plate 8 is separated from the right side of the outer piston sleeve 51 due to the hydraulic pressure, and the valve plate has no throttling function. The magnetorheological fluid flows from the left chamber to the right chamber, passes through the first circulation channel 20, the second circulation channel and the piston constant through hole 21 on the piston assembly, and then passes through the third circulation channel and the guide long through hole 17 on the valve body assembly.
In this embodiment, as shown in fig. 5, the position of valve plate 8 and compression spring is changed, and the valve plate is arranged on the left side of the piston assembly, so that different vibration reduction effects can be obtained, and the two arrangement modes can be assembled and used according to actual requirements.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A multi-loop asymmetric magnetorheological damper is characterized in that: the piston rod is connected with the piston mechanism and can drive the piston mechanism to reciprocate; the piston mechanism comprises a piston assembly, a valve plate assembly and a valve body assembly, wherein the piston assembly, the valve plate assembly and the valve body assembly are sequentially arranged along the axial direction of the cylinder from left to right; the piston rod drives the piston mechanism to reciprocate so as to form different magnetorheological fluid circulation loops.
2. The multi-loop asymmetric magnetorheological damper of claim 1, wherein: the piston assembly comprises a piston outer sleeve, a piston block arranged in the piston outer sleeve and a piston stop block arranged at the left end of the piston outer sleeve; permanent magnets are arranged in the circumferential direction of the piston block; the permanent magnet is wound with an excitation coil; the piston outer sleeve is provided with a magnetism isolating ring in the circumferential direction; the magnet exciting coil is arranged between the permanent magnet and the magnetism isolating ring.
3. The multi-loop asymmetric magnetorheological damper of claim 2, wherein: the magnetorheological fluid damper is characterized in that an installation ring groove for installing a permanent magnet is formed in the circumferential direction of the piston block, a plurality of piston constant-through holes axially penetrating through the piston block are formed in the piston block, and a first circulation channel for flowing magnetorheological fluid is formed between the piston block and the outer piston sleeve.
4. The multi-loop asymmetric magnetorheological damper of claim 3, wherein: the diameter of the outer piston sleeve is smaller than the inner diameter of the cylinder, and a second annular flow channel for flowing of the magnetorheological fluid is formed between the outer piston sleeve and the cylinder.
5. The multi-loop asymmetric magnetorheological damper of claim 4, wherein: the valve block subassembly includes valve block and compression spring, but valve block diameter is the same with piston outer sleeve diameter and valve block endwise slip arrange in piston outer sleeve right-hand member face, be provided with valve block hole and arc hole on the valve block, the valve block hole is in same axis direction with piston constant through hole, and the arc hole is in same axis direction with first circulation passageway.
6. The multi-loop asymmetric magnetorheological damper of claim 5, wherein: the piston block is in threaded connection with the piston rod, and the piston rod axially penetrates through the piston block and is in threaded connection with the valve body assembly.
7. The multi-loop asymmetric magnetorheological damper of claim 6, wherein: the valve body assembly comprises a left valve cover, a right valve cover, a valve core arranged between the two valve covers and an outer ring cylinder sleeved on the valve core and matched with the two valve covers; the valve core protrudes leftwards along the axis direction to form a guide mounting part which is used for being mounted with the piston block in a matching way; the guide installation portion is hollow structure and the piston rod is installed in the guide installation portion through threaded connection, the valve block can follow guide installation portion axial direction reciprocating sliding, the compression spring overcoat is arranged between valve block and left valve gap in guide installation portion and compression spring.
8. The multi-loop asymmetric magnetorheological damper of claim 7, wherein: the valve core is fixedly connected with the left valve cover and the right valve cover, and two ends of the outer ring cylinder are provided with positioning steps for mounting the left valve cover and the right valve cover; the valve core is provided with a guide constant through hole, and the piston constant through hole and the guide constant through hole are in the same axial direction; and a third circulation channel is formed between the valve core and the outer ring cylinder.
9. The multi-loop asymmetric magnetorheological damper of claim 8, wherein: a guide groove is formed in the circumferential direction of the outer ring barrel, and a guide ring is arranged between the inner wall of the guide groove and the inner wall of the barrel body.
10. The multi-loop asymmetric magnetorheological damper of claim 9, wherein: a floating piston is arranged between the valve body assembly and the right end cover, and a valve core is arranged on the right end cover.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586648A (en) * | 2021-08-06 | 2021-11-02 | 重庆大学 | Bidirectional independent valve magnetorheological damper |
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| 于建强等: "具有非对称力学特性的汽车磁流变减振器设计与控制", 《中国机械工程》 * |
| 廖昌荣等: "单筒充气型轿车磁流变液减振器研究", 《振动与冲击》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586648A (en) * | 2021-08-06 | 2021-11-02 | 重庆大学 | Bidirectional independent valve magnetorheological damper |
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| Publication number | Publication date |
|---|---|
| CN113027978B (en) | 2022-11-04 |
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