CN102425636A - Novel magneto-rheological damper - Google Patents
Novel magneto-rheological damper Download PDFInfo
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- CN102425636A CN102425636A CN2011103782346A CN201110378234A CN102425636A CN 102425636 A CN102425636 A CN 102425636A CN 2011103782346 A CN2011103782346 A CN 2011103782346A CN 201110378234 A CN201110378234 A CN 201110378234A CN 102425636 A CN102425636 A CN 102425636A
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Abstract
The invention discloses a novel magneto-rheological damper, which comprises a working cylinder body, a piston rod and a piston arranged in the working cylinder body, wherein the piston is coaxially sleeved outside the piston rod; the piston rod drives the piston to move in the working cylinder body; two sealing bodies are arranged in the working cylinder; the region between the two sealing bodies forms a motion region of the piston; the motion region of the piston is filled with a magneto-rheological fluid; two axially distributed piston annular grooves are circumferentially arranged on the piston; a permanent magnetic ring is arranged in the piston annular groove; an annular insulating layer is arranged outside the permanent magnetic ring; an excitation coil is wound outside the annular insulating layer; and the outer circumference of the excitation coil is in contact with the inner circumferential wall of the working cylinder body. The novel magneto-rheological damper has the advantages that by arranging the permanent magnetic rings in the piston grooves of the piston, and by further arranging the excitation coils outside the permanent magnetic rings, the magnetic field generated when electric current passes through the excitation coils during the operation of the magneto-rheological damper can be effectively enhanced, thus the damping force of the magneto-rheological liquid at a controllable state in the working cylinder body can be increased.
Description
Technical field
The present invention relates to a kind of damper, especially relate to a kind of novel MR damper.
Background technique
Stayed-cable bridge can make suspension cable produce vibration by a relatively large margin owing to receive wind, wind and rain or the effect of external other load, thereby causes suspension cable to produce fatigue phenomenon, shortens its life-span, even major accident such as can cause that bridge collapses.Therefore, in order to reduce the vibration of suspension cable, various control measure have been taked in the vibration of suspension cable, wherein more common method is: the purpose that reaches vibration damping through the endergonic mode of damper.
In recent decades; Utilize the controllable damper development of magnetorheological or electro-rheological technology more and more rapider; MR damper or electro-rheological fluid damper are also more and more wider in the application in vibration control field, and its controlled damping property has important effect at Vehicle Engineering, space flight and aviation, civil engineering, sports equipment etc.
MR damper be a kind of on practical applications the relatively significant intelligent vibration damping device of effectiveness in vibration suppression, the size of its damping force can be carried out remote stepless through the control power supply and regulated.The main component of the magnetic flow liquid that MR damper uses is soft magnetic particles, mother liquor and the proportion additive seldom in total component in order to prevent that the soft magnetic particles sedimentation from adding; Can change semisolid into from free fluid at moment (Millisecond) under the effect of magnetic flow liquid outside magnetic field; Present controlled yield strength, and this variation is reversible.
At present, common MR damper generally includes working cylinder, piston, field coil and piston rod, and piston is arranged in the working cylinder; Field coil is arranged in the piston groove of piston, and piston rod is fixedly connected with piston, is full of magnetic flow liquid in the working cylinder; Space between the periphery wall of piston and the inner circle wall of working cylinder constitutes the damp channel in magnetic field, and this MR damper has utilized the rheological properties of magnetic flow liquid, is provided with the damp channel in magnetic field; When piston and working cylinder generation relative movement, then can push the magnetic flow liquid in the working cylinder, it is flow through from damp channel; When not having the action of a magnetic field in the damp channel, magnetic flow liquid is a viscous fluid, if damp channel is applied magnetic field; Sclerosis takes place magnetic flow liquid in the damp channel becomes visco-plastic body, causes the damping force of piston motion to increase.This MR damper has the following advantages: 1) can change the yield strength of magnetic flow liquid through regulating magnetic intensity, thereby realize regulating the purpose of damping force size; 2) can be under the control of the electric current of field coil the required damping torque of output; Have control simple, do not have that machinery impacts, mechanical wear is little and characteristics such as noise is low, can be widely used in mechanically operated coupling, clutch/brake and tension control system etc.But the magnetic field when field coil is through electric current during the work of this MR damper relatively a little less than, the controllable damping effect of magnetic flow liquid is still waiting to improve; On the other hand, the Magnetic field distribution during the field coil galvanization is inhomogeneous, and the speed of response of the peripheral control circuit of MR damper is fast inadequately, has influenced the work safety characteristic.
Summary of the invention
Technical problem to be solved by this invention provides a kind of damping force that can effectively strengthen magnetic flow liquid, and simple in structure, working stability is reliable, the novel MR damper of long service life.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: a kind of novel MR damper; Comprise working cylinder, piston rod and be arranged at the piston in the described working cylinder, described piston is coaxial to be sheathed on outside the described piston rod, and the external diameter of described piston is less than the internal diameter of described working cylinder; Described piston rod drives described piston and in described working cylinder, moves; Be provided with two seals in the described working cylinder, the zone between two described seals constitutes the moving region of described piston, is full of magnetic flow liquid in the moving region of described piston; It circumferentially is provided with the piston ring connected in star of two axial distribution to it is characterized in that described piston upper edge; Be provided with permanent-magnetic clamp in the described piston ring connected in star, the inner circle wall of described permanent-magnetic clamp contacts with the axial perisporium of described piston ring connected in star, and two described permanent-magnetic clamps are with the incorgruous placement of magnetic pole; Described permanent-magnetic clamp is outside equipped with annular isolation layer; Described annular isolation layer is arranged with field coil outward, and the outside of described field coil is provided with the sealed insulation layer, and the periphery wall of described sealed insulation layer contacts with the inner circle wall of described working cylinder.
Two described field coil differential concatenations.
It radially is provided with first positioning through hole described piston rod upper edge; It radially is provided with second positioning through hole described piston upper edge; Described first positioning through hole and described second positioning through hole are equipped with a locating stud jointly, and described piston rod is fixedly connected with described piston through described locating stud.
Be provided with fairlead in the described piston rod, the lighting outlet of described field coil passes described fairlead and draws outside the described working cylinder, and the lighting outlet of described field coil is fixed on the inner circle wall of described fairlead through sealer.
Be provided with the guide pipe that cooperates with the afterbody of described piston rod in the afterbody of described working cylinder.
Described working cylinder is provided with magnetic flow liquid and introduces through hole, and described magnetic flow liquid is introduced in the through hole and is provided with sealing plug.
Compared with prior art, the invention has the advantages that:
1) MR damper of the present invention is through being provided with permanent-magnetic clamp in the piston groove of piston; Field coil is set outside permanent-magnetic clamp again; Magnetic field when MR damper work the time can effectively strengthen field coil is through electric current like this, thus the damping force of the magnetic flow liquid that is in controllable state in the working cylinder can be strengthened.
2) MR damper of the present invention is with being arranged at two outer field coil differential concatenations of two permanent-magnetic clamps respectively; Magnetic field when having optimized the field coil galvanization so greatly; Make that promptly the Magnetic field distribution on the whole piston is even; Thereby improved the Security of this MR damper effectively, but also can reduce the response time of the peripheral control circuit of this MR damper, increased its speed of response.
3) MR damper of the present invention is simple in structure, and descends rheological properties good in working order, has not only guaranteed working stability, and has prolonged working life.
Description of drawings
Fig. 1 is the structural representation of MR damper of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to sectional view;
Fig. 3 is that the B-B of Fig. 1 is to sectional view.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
A kind of novel MR damper that the present invention proposes, as shown in the figure, it comprises working cylinder 1, piston rod 2 and is arranged at the piston 3 in the working cylinder 1; The head and the tail two ends of working cylinder 1 are respectively arranged with and compress end cover 11, and like the hold-down bolt that can adopt sealing etc., the part body of rod of piston rod 2 is positioned at working cylinder 1; The head of piston rod 2 is connected with two journal stirrups 41, and the compressing of tail end that is arranged at working cylinder 1 is connected with single journal stirrup 42 on the end cover 11, piston 3 coaxial being sheathed on outside the piston rod 2; The external diameter of piston 3 is slightly less than the internal diameter of working cylinder 1, and the gap between the external diameter of the internal diameter of working cylinder 1 and piston 3 constitutes damp channel, and piston rod 2 drives piston 3 and in working cylinder 1, moves; Be provided with two seals 5 in the working cylinder 1; Zone between two seals 5 constitutes the moving region of piston 3, is full of magnetic flow liquid 6 in the moving region of piston 3, and it circumferentially is provided with the piston ring connected in star 31 of two axial distribution piston 3 upper edges; Be provided with permanent-magnetic clamp 32 in the piston ring connected in star 31; The inner circle wall of permanent-magnetic clamp 32 contacts with the axial perisporium of piston ring connected in star 31, and two permanent-magnetic clamps 32 are with the incorgruous placement of magnetic pole, and permanent-magnetic clamp 32 is outside equipped with annular isolation layer 33; The annular isolation layer 33 outer field coils 34 that are arranged with; The outside of field coil 34 is provided with sealed insulation layer 36, and the periphery wall of sealed insulation layer 36 contacts with the inner circle wall of working cylinder 1, i.e. gap between the external diameter of the internal diameter of field coil 34 comprehensive covering working cylinders 1 and piston 3.This MR damper is through acquiring permanent-magnetic clamp 32 in piston ring connected in star 31; The inner circle wall of permanent-magnetic clamp 32 contacts with the axial perisporium of piston annular inside groove 31; Field coil 34 is set outside permanent-magnetic clamp 32 again; Permanent-magnetic clamp 32 and field coil 34 effective cooperates the gap between the internal diameter of the external diameter that makes magnetic field effect gain, the field coil 34 that is provided with simultaneously comprehensively cover piston 3 and working cylinder 1 like this, and the viscosity of the magnetic flow liquid in the gap between the internal diameter of the external diameter of piston 3 and working cylinder 1 is the highest like this; This moment, the magnetic intensity of piston 3 generations was maximum, and the damping force of this MR damper output is maximum.This MR damper can make the leakage field of 34 of permanent-magnetic clamp 32 and field coils very little through between permanent-magnetic clamp 32 and field coil 34, layer of annular isolation layer 33 being set.
In this specific embodiment, piston 3 adopts electrical pure iron.
In this specific embodiment, two field coils 34 adopt the mode of differential concatenation to twine.Two field coil 34 differential concatenations not only can make the Magnetic field distribution on the whole piston 3 even; Thereby increase the controllable damping force and the adjustability coefficients of MR damper, avoided magnetic field saturated phenomenon too early, and when two field coil 34 proper functioning; The differential concatenation circuit only need be imported single coil current doubly and get final product; Can reduce the burden and the power consumption of the peripheral control circuit of MR damper, thereby reduce the response time of peripheral control circuit, increase its speed of response.
In this specific embodiment; It radially is provided with first positioning through hole 25 piston rod 2 upper edges; It radially is provided with second positioning through hole, 35, the first positioning through hole 25 and second positioning through hole 35 is equipped with a locating stud 7 jointly piston 3 upper edges, and piston rod 2 is fixedly connected with piston 3 through locating stud 7.
In this specific embodiment, be provided with fairlead 21 in the piston rod 2, the lighting outlet 341 of field coil 34 passes fairlead 21 and draws outside the working cylinder 1, and the lighting outlet 341 of field coil 34 is fixed on the inner circle wall of fairlead 21 through sealer 22.
In this specific embodiment, be provided with the guide pipe 8 that cooperates with the afterbody of piston rod 2 in the afterbody of working cylinder 1.
In this specific embodiment, working cylinder 1 is provided with magnetic flow liquid and introduces through hole 91, and magnetic flow liquid is introduced in the through hole 91 and is provided with sealing plug 92, and the bolt of the also available band seal ring of sealing plug 92 substitutes.
When MR damper of the present invention is used for stayed-cable bridge; When the external world receives vibration to reach predetermined extent; Relative movement takes place with working cylinder 1 in the piston 3 of MR damper of the present invention, and magnetic flow liquid 6 is extruded through damp channel, and 6 moments of magnetic flow liquid are changed semisolid into from free fluid under the effect of field coil 34 and permanent-magnetic clamp 32 magnetic field superposition; Present controlled yield strength, this variation is reversible; When external magnetic field vibrates when not obvious; There is not the action of a magnetic field in the damp channel; Magnetic flow liquid 6 is a viscous fluid, and when field coil 34 increased through electric current, damp channel applied magnetic field and increases; Sclerosis takes place magnetic flow liquid 6 in the damp channel becomes visco-plastic body, causes the damping force of piston 3 motions to increase.Therefore, regulate the size of current that field coil 34 passes through, change of magnetic field strength can change the yield strength of magnetic flow liquid 6, thereby can regulate the size of the damping force of damper.
Claims (6)
1. novel MR damper; Comprise working cylinder, piston rod and be arranged at the piston in the described working cylinder, described piston is coaxial to be sheathed on outside the described piston rod, and the external diameter of described piston is less than the internal diameter of described working cylinder; Described piston rod drives described piston and in described working cylinder, moves; Be provided with two seals in the described working cylinder, the zone between two described seals constitutes the moving region of described piston, is full of magnetic flow liquid in the moving region of described piston; It circumferentially is provided with the piston ring connected in star of two axial distribution to it is characterized in that described piston upper edge; Be provided with permanent-magnetic clamp in the described piston ring connected in star, the inner circle wall of described permanent-magnetic clamp contacts with the axial perisporium of described piston ring connected in star, and two described permanent-magnetic clamps are with the incorgruous placement of magnetic pole; Described permanent-magnetic clamp is outside equipped with annular isolation layer; Described annular isolation layer is arranged with field coil outward, and the outside of described field coil is provided with the sealed insulation layer, and the periphery wall of described sealed insulation layer contacts with the inner circle wall of described working cylinder.
2. a kind of novel MR damper according to claim 1 is characterized in that two described field coil differential concatenations.
3. a kind of novel MR damper according to claim 1 and 2; It radially is provided with first positioning through hole to it is characterized in that described piston rod upper edge; It radially is provided with second positioning through hole described piston upper edge; Described first positioning through hole and described second positioning through hole are equipped with a locating stud jointly, and described piston rod is fixedly connected with described piston through described locating stud.
4. a kind of novel MR damper according to claim 3; It is characterized in that being provided with fairlead in the described piston rod; The lighting outlet of described field coil passes described fairlead and draws outside the described working cylinder, and the lighting outlet of described field coil is fixed on the inner circle wall of described fairlead through sealer.
5. a kind of novel MR damper according to claim 4 is characterized in that being provided with the guide pipe that cooperates with the afterbody of described piston rod in the afterbody of described working cylinder.
6. a kind of novel MR damper according to claim 5 is characterized in that described working cylinder is provided with magnetic flow liquid and introduces through hole, and described magnetic flow liquid is introduced in the through hole and is provided with sealing plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103782346A CN102425636A (en) | 2011-11-24 | 2011-11-24 | Novel magneto-rheological damper |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103782346A CN102425636A (en) | 2011-11-24 | 2011-11-24 | Novel magneto-rheological damper |
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| CN102425636A true CN102425636A (en) | 2012-04-25 |
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| CN2011103782346A Pending CN102425636A (en) | 2011-11-24 | 2011-11-24 | Novel magneto-rheological damper |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912621A (en) * | 2014-04-28 | 2014-07-09 | 浙大新剑（上海）智能技术有限公司 | Double-output rod magneto-rheological fluid washing machine damping absorber and manufacturing method thereof |
| CN104776154A (en) * | 2015-04-23 | 2015-07-15 | 安徽科技学院 | Single-cylinder single-rod magnetorheological damper for automobile |
| CN104963986A (en) * | 2015-07-14 | 2015-10-07 | 华东交通大学 | Magneto-rheological damper with mixed flow type fluid flowing channel |
| CN107253043A (en) * | 2017-06-29 | 2017-10-17 | 重庆大学 | A kind of variable flexibility mechanical arm tool for twisting screw of Three Degree Of Freedom |
| CN110925380A (en) * | 2019-12-06 | 2020-03-27 | 山东科技大学 | Planetary magnetorheological transmission device based on shearing-extruding effect |
| CN112610642A (en) * | 2020-12-28 | 2021-04-06 | 中国北方车辆研究所 | Electric current variable shock absorber for off-road vehicle |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912621A (en) * | 2014-04-28 | 2014-07-09 | 浙大新剑（上海）智能技术有限公司 | Double-output rod magneto-rheological fluid washing machine damping absorber and manufacturing method thereof |
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| CN104776154A (en) * | 2015-04-23 | 2015-07-15 | 安徽科技学院 | Single-cylinder single-rod magnetorheological damper for automobile |
| CN104963986A (en) * | 2015-07-14 | 2015-10-07 | 华东交通大学 | Magneto-rheological damper with mixed flow type fluid flowing channel |
| CN107253043A (en) * | 2017-06-29 | 2017-10-17 | 重庆大学 | A kind of variable flexibility mechanical arm tool for twisting screw of Three Degree Of Freedom |
| CN107253043B (en) * | 2017-06-29 | 2019-02-26 | 重庆大学 | A kind of variable flexibility mechanical arm tool for twisting screw of Three Degree Of Freedom |
| CN110925380A (en) * | 2019-12-06 | 2020-03-27 | 山东科技大学 | Planetary magnetorheological transmission device based on shearing-extruding effect |
| CN112610642A (en) * | 2020-12-28 | 2021-04-06 | 中国北方车辆研究所 | Electric current variable shock absorber for off-road vehicle |
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Application publication date: 20120425 |