CN101319699B - Magneto-rheological fluid vibration damper with ring-shaped external magnetic field generator - Google Patents

Magneto-rheological fluid vibration damper with ring-shaped external magnetic field generator Download PDF

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Publication number
CN101319699B
CN101319699B CN200810069967XA CN200810069967A CN101319699B CN 101319699 B CN101319699 B CN 101319699B CN 200810069967X A CN200810069967X A CN 200810069967XA CN 200810069967 A CN200810069967 A CN 200810069967A CN 101319699 B CN101319699 B CN 101319699B
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China
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magnetic
outer shell
end cap
field generator
damp channel
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Expired - Fee Related
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CN200810069967XA
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CN101319699A (en
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廖昌荣
刘会兵
张红辉
余淼
陈伟民
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Chongqing University
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Chongqing University
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Abstract

The invention relates to a magneto-rheological liquid damper based on a radial-flow model, comprising a working cylinder component, a magnetic-field generator component, a sealed structure and a connection mechanism. A stepped bulkhead structure is arranged between the inner cylinder and the outer cylinder to achieve a multilevel radial damping channel, and the magneto-rheological liquid is forced to flow into the damping channel of the magnetic-field generator. The exciting coil of the magnetic-field generator is wound on the periphery of the outer cylinder in circumferential direction; the magnetic flux of the magnetic field generated by the exciting coil is distributed in the magnetic circuit of the damping channel; both the outer oil cylinder and the inner oil cylinder adopt non-magnetic conductive material to concentrate the magnetic flux into the magnetic circuit of the damping channel. When the current runs through the exciting circuit, the damping channel is influenced by the magnetic field, the flow characteristics of magneto-rheological liquid is changed, the flow resistance increases and the damping force grows. The damper is capable of avoiding the problem that the sealing is influenced by the built-in magnetic-field generator; the reliability of the damper is improved; and the damper is applicable to horizontal vibration and crawl vibration control of the suspension system of high-speed rail vehicles.

Description

MR fluid shock absorber with ring-shaped external magnetic field generator
Technical field
The invention belongs to rail vehicle suspension system technical field, be specifically related to controllable damper in the high-speed track vehicle suspension system, is that vertical damper, two is lateral damper and the anti-vibration damper etc. that crawls as the axle box vibration damper, two of controllable damping characteristic.
Background technique
Each is variant for existing disclosed MR fluid shock absorber structure, generally adopts built-in magnetic field generator and bypass type magnetic field generator.For the MR fluid shock absorber of built-in magnetic field generator, its ring-type magnetorheological fluid damp passage is arranged in magnetic field generator, perhaps the gap between magnetic field generator and operating cylinder.Be operated in when vibration damper under the condition of field current control, the variation of the flow characteristic of magnetic flow liquid makes the resistance of shock absorber characteristic change in the annular pass, because passage length is subjected to the restriction of Magnetic field distribution, the damping force of vibration damper is regulated numerical value can not satisfy the requirement of rail vehicle suspension system to the resistance of shock absorber value.The lighting outlet of field coil need pass through piston rod simultaneously, and there is certain technical difficulty in lighting outlet sealing reliably and with long-term.MR fluid shock absorber for the bypass type magnetic field generator, although it is bigger that vibration damper is regulated damping value, but the unreliable and magnetic field generator that pipeline links takes up space, and makes bypass type MR fluid shock absorber can not satisfy the rail vehicle suspension system to the vibration damper installation specification.
Summary of the invention
The present invention is directed to the deficiency that existing MR fluid shock absorber exists, a kind of MR fluid shock absorber of external ring-type magnetic field generator is proposed, improve the reliability of MR fluid shock absorber regulation range and magnetic field generator, realize that compression damping power equates with recovery damping force, satisfy axle box vibration damper in the rail vehicle suspension system, lateral damper and the anti-symmetrical requirement of vibration damper of crawling damping characteristic.
Technological scheme of the present invention is as follows:
MR fluid shock absorber based on ring-shaped external magnetic field generator is made up of clutch release slave cylinder assembly, magnetic field generator assembly, sealing configuration and coupling device.
Described clutch release slave cylinder assembly comprises interior outer shell and left and right sides end cap, is installed in the piston rod of piston, binding and drive piston in the inner casing; Interior outer shell is sealed at both ends, magnetic flow liquid is arranged in the cylinder, the turnover oilhole of outer shell in interior outer shell two ends are provided with and are communicated with, the toroidal membrane of interlaced arrangement is set between inner casing and outer shell, form multistage radially damp channel, because the motion of piston in clutch release slave cylinder, force magnetic flow liquid flow into through the turnover oilhole from active chamber of inner casing between the outer shell in, the outer shell two ends radially damp channel then Radial Flow pass through another active chamber that multistage damp channel is got back to inner casing, its flow direction is for radially, the magnetic flux that field coil produces is concentrated at the magnetic circuit of design and is passed through, the direction of magnetic flux is for radially, vertical with the flow direction of magnetic flow liquid, increase the flow resistance of magnetic flow liquid, the damping force of MR fluid shock absorber is increased, reduce field current, the magnetic flux by damp channel also reduces thereupon, the flow resistance of magnetic flow liquid reduces, and the damping force of MR fluid shock absorber also reduces.
Described magnetic field generator assembly is enclosed in the outside of clutch release slave cylinder assembly, comprise field coil, urceolus, left end magnetic guiding loop, right-hand member magnetic guiding loop, left end cap yoke, right end cap yoke, magnetic flow liquid and the toroidal membrane of interlaced arrangement between inner casing and outer shell, field coil outer shell last week to coiling, draw controlled excitation power supply line by urceolus, urceolus is enclosed within outside the field coil, left end magnetic guiding loop and right-hand member magnetic guiding loop are arranged on the field coil two ends, and be clipped between urceolus and the outer shell, between urceolus and outer shell, be formed with left end cap yoke and right end cap yoke.When field current was zero, the magnetic flow liquid in the damp channel was not affected by magnetic fields, and flow characteristic is good, and the damping force of vibration damper is little.When electric current passed through field coil, damp channel was subjected to influence of magnetic field, and the flow characteristic of magnetic flow liquid is changed, and its flow resistance increases, and the damping force of vibration damper increases.
Described coupling device is attached at the two ends of outer shell.
For the magnetic flux that coil is produced enter in damp channel between the outer shell, prevent that magnetic flux from entering interior outer shell body, improve magnetic field to the magnetic flow liquid functioning efficiency in the damp channel, interior outer shell adopts non-magnet material to make, or adopt the low stainless steel material of permeability to make, also can guarantee its requirement of strength.Be to reduce the magnetic circuit of the magnetic flux of coil generation by end cap and piston rod formation in addition, piston rod adopts non-magnet material to make, or the low stainless steel material making of employing permeability, also can guarantee its requirement of strength.The end cap of interior outer shell adopts the part of low carbon steel making as magnetic circuit.
Piston rod in the described clutch release slave cylinder assembly adopts the two extension bar structures of equal diameter, and directly stretch out from left and right sides end cap at the two ends of piston rod, and an end links to each other with the coupling device of outside.Because this clutch release slave cylinder, the sectional area of piston rod, the symmetric relation of magnetic field generator, make the MR fluid shock absorber damping characteristic have the symmetrical damping characteristic of recovery and compression stroke, can satisfy axle box vibration damper in the rail vehicle suspension system, lateral damper and the anti-symmetrical requirement of vibration damper of crawling damping characteristic.
Sealing configuration comprises rod seal and outer cylinder sealing, has adopted two guide rings and three grades of magnetic rubber Y type sealings in rod seal, guide ring and magnetic rubber Y type sealing alternate layout; Three grades of magnetic O type sealings are adopted in the outer cylinder sealing.The magnetic field of sealing of magnetic rubber Y type and the sealing of magnetic O type makes magnetic flow liquid produce consolidation effect, thereby stops seepage, the realization magnetic seal of magnetic flow liquid, and magnetic rubber Y type sealing simultaneously can realize mechanical seal again.
The present invention has following advantage:
1. at the damp channel design aspect of MR fluid shock absorber, adopted the ring-shaped external mode, both can avoid the sealing problem of field coil lead-in wire, the direction that can realize magnetic flux again is vertical with the mobile direction of magnetic flow liquid, and the effective length of damp channel is much larger than the effective length of built-in axial damp channel, thereby effectively improved the reliability of MR fluid shock absorber regulation range and magnetic field generator.
2. aspect the Seal Design of MR fluid shock absorber, two guide rings and three grades of magnetic Y type sealings in rod seal, have been adopted, three grades of magnetic O type sealings are adopted in the outer cylinder sealing, the magnetic field of sealing of magnetic rubber Y type and the sealing of magnetic O type makes magnetic flow liquid produce consolidation effect, thereby the seepage, the realization magnetic seal that stop magnetic flow liquid, magnetic rubber Y type sealing simultaneously and the sealing of magnetic O type can realize mechanical seal again, have improved the sealing reliability of MR fluid shock absorber.
3. piston cylinder assembly has adopted the two extension bar structures of equal diameter, can realize that compression damping power equates with recovery damping force, can satisfy axle box vibration damper in the rail vehicle suspension system, lateral damper and the anti-symmetrical requirement of vibration damper to damping characteristic of crawling.
Description of drawings
Fig. 1 is the MR fluid shock absorber overall construction drawing with ring-shaped external magnetic field generator.
Fig. 2 is MR fluid shock absorber magnetic field generator working principle and the sealing configuration enlarged view with ring-shaped external magnetic field generator.
Among the figure: 1 is left suspension ring, and 2 is piston rod, and 3 is the sealing of magnetic rubber O type, 4 is the sealing of magnetic rubber Y type, and 5 is guide ring, and 6 is the radial hole outlet gap, 7 is piston, and 8 is urceolus, and 9 is field coil, 10 is the magnetic field generator assembly, and 11 is right end cap, and 12 is hold down gag, 13 is right suspension ring, and 14 is backing-up screw, and 15 is dust-proof cover, 16 is inner casing, and 17 is outer shell magnetic rubber O type seal element, and 18 is the right end cap yoke, 19 is damp channel, and 20 is outer shell, and 21 is interior toroidal membrane, 22 is the outer ring dividing plate, and 23 is the left end magnetic guiding loop, and 24 is magnetic flow liquid, 25 is left end cap, and 26 is left hold down gag, and 27 are the piston motion direction, 28 is the right-hand member radial hole, and 29 is the magnetic flow liquid radial flow direction, 30 interior breach, 31 outer breach, 32 are damp channel radially, 33 is piston and piston rod welding part, 34 is the piston guide ring, and 35 is lighting outlet, and 36 is the right-hand member radial hole, 37 is positioning screwn, 38 is piston seal, 39 inner casing insertion ends, 40 right-hand member magnetic guiding loops.
Specific implementation
The structure of MR fluid shock absorber with ring-shaped external magnetic field generator is referring to Fig. 1 and Fig. 2: it is made up of clutch release slave cylinder assembly, magnetic field generator assembly 10 and coupling device.
The clutch release slave cylinder assembly comprises inner casing 16, outer shell 20, piston 7, piston rod 2, right end cap 11, left end cap 25, magnetic rubber Y type seal element 4, magnetic rubber O type seal element 17 etc.Piston assembly adopts the two extension bar structures of equal diameter, and directly stretch out from left and right sides end cap 11 and 25 at the two ends of piston rod 2, and an end links to each other with the coupling device 13 of outside, does not need volume compensation.Two guide rings and three grades of magnetic rubber Y types sealings 4 of scribbling teflon between piston rod 2 and right end cap 11, left end cap 25, have been adopted, the magnetic field of magnetic rubber Y type sealing makes magnetic flow liquid produce consolidation effect, thereby stop seepage, the realization magnetic seal of magnetic flow liquid, magnetic rubber Y type sealing simultaneously can realize mechanical seal again.Adopt 17 sealings of three grades of magnetic rubber O type seal elements between outer shell 20 and right end cap 11, the left end cap 25, the magnetic field of magnetic rubber O type sealing makes magnetic flow liquid produce consolidation effect, thereby stop seepage, the realization magnetic seal of magnetic flow liquid, magnetic rubber O type sealing simultaneously can realize mechanical seal again.By the boss radial location, be anchored on outer shell 20 by left and right sides hold down gag 12,26 respectively between right end cap 11, left end cap 25 and the outer shell 20.Left side hold down gag 26 is provided with suspension ring, threaded joint between left hold down gag 26 and the outer shell 20, and threaded joint between right hold down gag 12 and the outer shell 20 forms coupling device 13.The toroidal membrane of interlaced arrangement is set between inner casing 16 and outer shell 20, promptly form with outer ring dividing plate 22 arranged alternate by interior toroidal membrane 21, adjacent separator is provided with outer breach 31 and interior breach 30 respectively, magnetic flow liquid by interior breach 31 and interior breach 30 radially flows between dividing plate, forms multistage radially damp channel 32 thus.The inner casing two ends are provided with uniform left and right end radial hole 36 and 29, so that magnetic flow liquid 24 communicates with damp channel 32.Link by welding manner between piston 7 and the piston rod 2,33 is the welding part of piston and piston rod, and the piston outer rim is provided with by guide ring 34 and two-stage seal ring 38, leaks by the piston outer rim to prevent magnetic flow liquid 24.Be full of magnetic flow liquid 24 in inner casing 16 and the damp channel 32, because the motion of piston in clutch release slave cylinder, 27 is the moving direction of piston, force magnetic flow liquid 24 to enter multistage damp channel 32 by the opening of inner casing 16 left ends, magnetic flow liquid 24 is entered another active chamber of clutch release slave cylinder again in damp channel 32 Radial Flow by the inner casing 16 right-hand member radial holes 28 of the other end.
Magnetic field generator assembly 10 is made up of field coil 9, urceolus 8, left end magnetic guiding loop 23, right-hand member magnetic guiding loop 40, left end cap yoke 6, right end cap yoke 18, magnetic flow liquid 24, interior toroidal membrane 21 and outer ring dividing plate 22 etc.The magnetic flux that produces in order to ensure field coil 9 passes through radially damp channel 32, inner casing 16 adopts the low stainless steel (1Cr18Ni9Ti) of permeability to make, the two ends of outer shell 20 adopt permeability height and the high low carbon steel (No. 10 steel) of magnetic saturation intensity to make, and the stage casing adopts the low stainless steel (1Cr18Ni9Ti) of permeability to make, stage casing and two ends adopt welding manner to link, piston rod 2 also adopts the low stainless steel of permeability (1Cr18Ni9Ti) to make with piston 7, urceolus 8 adopts permeability height and the high low carbon steel (No. 10 steel) of magnetic saturation intensity to make, toroidal membrane 22 (21) adopts permeability height and the high low carbon steel (No. 10 steel) of magnetic saturation intensity to make, left end magnetic guiding loop 23 and right-hand member magnetic guiding loop 40 adopt permeability height and the high low carbon steel (No. 10 steel) of magnetic saturation intensity to make, and left end cap yoke 6 and right end cap yoke 18 adopt permeability height and the high low carbon steel (No. 10 steel) of magnetic saturation intensity to make.Current driver by lighting outlet 35 to field coil 9 energising, the left end of right-hand member, right end cap yoke 18, magnetic flow liquid 24 and the inside-and-outside ring dividing plate 21 and 22 of the magnetic flux of generation by urceolus 8, right-hand member magnetic guiding loop 40, outer shell 20, left end cap yoke 6, outer shell 20, left end magnetic guiding loop 23 etc.The magnetic flux that field coil 9 produces is axial directions by damp channel 32, and magnetic flow liquid is radial direction at the flow direction of damp channel 32, so this magnetic circuit satisfies magnetorheological device magnetic Circuit Design criterion.When magnetic flow liquid 24 flowed in damp channel 32, the magnetic flux that field coil 9 produces changed its flow characteristic, and then the pressure difference between vibration damper two chambeies is taken place, the damping characteristic of control vibration damper.37 is positioning screwn among the figure, and 38 is piston seal, 39 inner casing insertion ends.
Coupling device 13 is used to transmit the relative vibration displacement between the train associated components, comprises left and right sides suspension ring 1 and 13, dirt-proof boot 15 and mounting bush etc.Left side suspension ring 1 link by screw thread and outer shell 20, simultaneously left end cap 25 are played the effect that compresses.Right suspension ring 13 link by screw thread and piston rod 2, and locking thread screw 14 is set, and piston rod dust-proof cover 15 is installed on right suspension ring.Left and right sides suspension ring can be provided with rubber bushing or metal lining by installation requirement.

Claims (5)

1. the MR fluid shock absorber based on the Radial Flow pattern comprises clutch release slave cylinder assembly, magnetic field generator assembly, sealing configuration and coupling device; It is characterized in that:
Described clutch release slave cylinder assembly comprises interior outer shell and left and right sides end cap, is installed in the piston rod of piston, binding and drive piston in the inner casing; Interior outer shell is sealed at both ends, magnetic flow liquid is arranged in the cylinder, the turnover oilhole of outer shell in interior outer shell two ends are provided with and are communicated with, the toroidal membrane of interlaced arrangement is set between inner casing and outer shell, form multistage radially damp channel, magnetic flow liquid is from the radially damp channel of interior outer shell one end of active chamber process turnover oilhole inflow of inner casing, and Radial Flow is passed through another active chamber that multistage radially damp channel is got back to inner casing then;
Described magnetic field generator assembly is enclosed in the outside of clutch release slave cylinder assembly, comprise field coil, urceolus, left end magnetic guiding loop, right-hand member magnetic guiding loop, left end cap yoke, right end cap yoke, magnetic flow liquid and the toroidal membrane of interlaced arrangement between inner casing and outer shell, field coil outer shell last week to coiling, draw controlled excitation power supply line by urceolus, urceolus is enclosed within outside the field coil, left end magnetic guiding loop and right-hand member magnetic guiding loop are arranged on the field coil two ends, and be clipped between urceolus and the outer shell, be formed with left end cap yoke and right end cap yoke respectively at the two ends of toroidal membrane;
Described coupling device is attached at the two ends of outer shell.
2. the MR fluid shock absorber based on the Radial Flow pattern according to claim 1, it is characterized in that: described multistage radially damp channel radially flows magnetic flow liquid, the controllable magnetic field that field current produces concentrates in the damp channel magnetic circuit and distributes vertically, magnetic flow liquid flows direction perpendicular to the externally-applied magnetic field direction, forms multistage damp channel series connection.
3. the MR fluid shock absorber based on the Radial Flow pattern according to claim 1 and 2, it is characterized in that: outer shell and piston rod adopt non-magnet material to make in described, to increase magnetic resistance, the controllable magnetic field that field current is produced concentrates in the damp channel magnetic circuit, the end cap of interior outer shell adopts low carbon steel to make and then as the part of magnetic circuit, urceolus is made of low carbon steel and then as the part of magnetic circuit, damp channel is as the important component part of magnetic circuit, its toroidal membrane adopts low carbon steel to make, and toroidal membrane and magnetic flow liquid form the plural serial stage magnetic circuit.
4. the MR fluid shock absorber based on the Radial Flow pattern according to claim 3, it is characterized in that: the piston rod in the described clutch release slave cylinder assembly adopts the two extension bar structures of equal diameter, directly stretch out from left and right sides end cap at the two ends of piston rod, and an end links to each other with the coupling device of outside.
5. the MR fluid shock absorber based on the Radial Flow pattern according to claim 4, it is characterized in that: sealing configuration comprises rod seal and outer shell sealing, two guide rings and three grades of magnetic rubber Y type sealings in rod seal, have been adopted, guide ring and magnetic rubber Y type sealing alternate layout; Three grades of magnetic O type sealings are adopted in the outer shell sealing.
CN200810069967XA 2008-07-11 2008-07-11 Magneto-rheological fluid vibration damper with ring-shaped external magnetic field generator Expired - Fee Related CN101319699B (en)

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