CN103807329B - A kind of electric vortex buffering apparatus based on magnetic rheology effect - Google Patents
A kind of electric vortex buffering apparatus based on magnetic rheology effect Download PDFInfo
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- CN103807329B CN103807329B CN201410068391.0A CN201410068391A CN103807329B CN 103807329 B CN103807329 B CN 103807329B CN 201410068391 A CN201410068391 A CN 201410068391A CN 103807329 B CN103807329 B CN 103807329B
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Abstract
The present invention relates to a kind of current vortex retarder based on magnetic rheology effect, comprise rotor disk, field frame assembly, power transmission shaft, magnetic flow liquid. Field frame assembly comprises bearing sleeve, stator case etc. In the middle of field frame assembly is positioned at, two rotor disks are placed in respectively in the stator case of field frame assembly both sides, and the gap between housing and rotor disk is filled by magnetic flow liquid, and 8 excitation units are separately fixed on the interior side body of both sides stator case. The magnetic flow liquid that the utilization of this structure has high permeability and utmost point low conductivity has replaced the air gap between rotor and stator, reduces magnetic circuit reluctance. Meanwhile, under magnetic fields, magnetic flow liquid is converted into the Bingham fluid with higher shear yield stress by the low Newtonian fluid of viscosity pole. When braking, the braking moment that the braking moment that current vortex produces and magnetic flow liquid produce acts on simultaneously. The current vortex retarder of this structure has energy saving, coil heating is few, braking moment is large, and braking moment controllability is good, the feature that low-speed performance is good.
Description
Technical field
The present invention relates to a kind of current vortex retarder based on magnetic rheology effect, particularly with the current vortex retarder of magnetic flow liquid while as magnetic conductive media and working media.
Background technology
Along with the development of auto industry, the travel speed of automobile is more and more faster, and brake efficiency and the security of automobile are also paid close attention to widely. Traditional brake, the in the situation that of long-time lasting braking, can produce heat fading phenomenon, causes brake efficiency greatly to reduce, and has a strong impact on the security performance of automobile. Along with in recent years, country, about the proposition of automotive safety regulation, must be provided with auxiliary brake on large truck, passenger vehicle. Automobile auxiliary brake can be born most braking energy, reduces the brake load of running brake, the security that greatly improves automobile. The complemental brake system of main application is current vortex retarder and Retarder at present.
There is following shortcoming in existing current vortex retarder:
1, there is certain air gap in the pole shoe of current vortex retarder and rotor, because the magnetic conductivity of air is extremely low, cause magnetic circuit reluctance very large, therefore want in rotor to produce enough large eddy current effect, magnet exciting coil must pass through very large exciting current, cause magnet exciting coil excess Temperature, and battery load is large, affects the life-span of battery.
2, the braking moment of current vortex retarder not only and pass into the current related of magnet exciting coil, and also has much relations with car speed. Car speed is higher, and braking moment is larger; Speed is lower, and braking moment is less. So in automobile low speed situation, the braking moment of current vortex retarder is little, slow effect is undesirable.
Current Retarder has following shortcoming:
1, the complex structure of Retarder, the accuracy of manufacture is high, and cost is high.
2, Retarder braking moment in the time of low speed is very little, can not meet brake request; And when braking, working solution is pressed into working chamber needs certain hour, causes the braking response time long.
Magnetic flow liquid is a kind of novel intelligent material, and it is to disperse to be dissolved in by the soft magnetism microparticle of high permeability, low magnetic hysteresis the suspension forming in insulating base liquid. Under magnetic fields, the apparent viscosity of magnetic flow liquid increases rapidly in several milliseconds, and shear yield stress increases with the increase in magnetic field, in the time removing magnetic field, reverts to rapidly again original low viscous state. This liquid is not only along with externally-applied magnetic field changes and can control the stable suspension of its rheological behavior, and has higher magnetic conductivity, very low electric conductivity and fabulous heat endurance. So in recent years, be widely used in the research of New Brake, and there is good application prospect.
At present, magneto-rheologic liquid brake is mostly disk brake (for example, referring to Chinese patent 201110427735.9, US Patent No. 8631917B2), utilize magnetic flow liquid to be filled between rotor and stator as brake working solution, by uniform magnetic field, the shear yield stress of magnetic flow liquid is increased, reach the effect of braking. But only utilize the rheological behavior of magnetic flow liquid under outside magnetic fields to produce the feature that braking moment is braked, so the braking moment providing is very limited. Chinese patent 201210434149.1, name is called " based on free-standing Retarder and the control method thereof of magnetic flow liquid ", utilize the working solution of magnetic flow liquid as Retarder, and increase braking moment and the low-speed performance that improves retarder by the rheological behavior of magnetic flow liquid, but its complex structure, design makes magnetic flow liquid viscosity change uniform excitation unit difficulty, and the inhomogeneous magnetic flow liquid of viscosity is difficult to ensure the stability of braking effect in the complexity of chamber, whirlpool flow field.
Summary of the invention
In view of the deficiencies in the prior art, the object of the present invention is to provide the coefficient Novel retarding apparatus of a kind of magnetic rheology effect and eddy current effect, it has between stator and rotor without air gap, exciting current little, the feature that coil heating is low, braking moment is large, low speed braking ability is good, braking moment controllability is good, simple in structure.
Technical program of the present invention lies in:
A kind of electric vortex buffering apparatus based on magnetic rheology effect, it is characterized in that: comprise that a bearing sleeve and is located at the power transmission shaft in bearing sleeve, the two ends of described bearing sleeve are respectively equipped with a stator case, in described stator case, be installed on the rotor disk being connected with power transmission shaft, between described rotor disk and stator case, fill magnetic flow liquid, bearing sleeve periphery between two stator cases is provided with magnetic core, on described magnetic core, have around the home magnet exciting coil, the two ends of described magnetic core are connected through pole shoe and stator case inwall.
Wherein, described stator case comprises outside housing, interior side body and circular cylindrical shell.
Described pole shoe, magnetic core, magnet exciting coil composition excitation unit, and described excitation unit is 8, the center of circle of 8 excitation units lays respectively between the stator case of both sides, the a pair of pole shoe of each excitation unit is uniformly distributed on the same reference circle of the interior side body that is fixed on both sides stator case, and the magnetic pole of two adjacent excitation units is always contrary.
Described a pair of pole shoe be shaped as two vary in size outstanding fan-shaped, on described interior side body, offer the fan-shaped groove matching with pole shoe, described pole shoe inserts in the fan-shaped groove of interior side body, form with interior side body the disk body sealing, and pole shoe directly contacts with the magnetic flow liquid of filling in stator case.
On described interior side body, have steam vent, on the housing of outside, have liquid injection hole, liquid injection hole, steam vent are blocked by fluting tack holding screw; There are respectively two screwed holes the both sides of described circular cylindrical shell, for being connected with outer stator.
The invention has the advantages that:
1, utilize permeability higher, the magnetic flow liquid that conductance is extremely low replaces non-magnetic air gap in traditional electrical eddy current retarder, greatly reduces the magnetic resistance in magnetic circuit. So, under identical exciting current, can significantly increase the magnetic flux by rotor disk, thereby the braking moment of retarder is obviously increased. Obtaining under the prerequisite of identical slow effect, the exciting current that magnet exciting coil needs obviously reduces, thereby greatly reduces the heating of magnet exciting coil and the load of battery.
2, in this device, the braking moment that magnetic rheology effect produces is only relevant with the size of external magnetic field strength, irrelevant with the rotating speed of rotor disk. So, when braking, the braking moment that the braking moment that magnetic rheology effect produces and eddy current effect produce acts on simultaneously, and this not only makes the maximum braking moment of current vortex retarder increase, and has improved low speed braking ability and the braking moment controllability of current vortex retarder.
3, the shear yield stress of magnetic flow liquid can increase rapidly in several milliseconds, not only can not reduce the braking response time of current vortex retarder, and control the shear yield stress of magnetic flow liquid simultaneously and by the magnetic flux of rotor disk, make the Current Control of this device simple and reliable by the electric current of magnet exciting coil.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is outside housing right view.
Fig. 3 is interior side body left view.
Fig. 4 is circular cylindrical shell left view.
Fig. 5 is pole shoe left view.
Fig. 6 is under duty, magnetic circuit schematic diagram.
Wherein: 1. circular cylindrical shell; 2. outside housing; 3. rotor disk; 4. magnetic flow liquid; 5. interior side body; 6. general flat key; 7. outer lip-type packing; 8. bearing cap; 9. pole shoe; 10. fan-shaped sealing ring; 11. inner bearings; 12. interior lip-type packings; 13. outer bearings; 14. power transmission shafts; 15. check rings; 16. sleeves; 17. bearing sleeves; 18. sunk screws; 19. fluting flush end holding screws; 20. magnetic cores; 21. magnet exciting coils; 22. seal washers.
Detailed description of the invention
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing, be described in detail below.
As shown in Figure 1, the present invention is mid-field frame assembly, the two-spool symmetrical structure in both sides, comprises circular cylindrical shell 1(2), outside housing 2(2), rotor disk 3(2), magnetic flow liquid 4, interior side body 5(2), general flat key 6(2), outer lip-type packing 7(2), bearing cap 8(2), pole shoe 9(16), fan-shaped sealing ring 10(4), inner bearing 11(2), interior lip-type packing 12(2); Outer bearing 13(2), power transmission shaft 14, check ring 15(4), sleeve 16(2), bearing sleeve 17, sunk screw 18(16), 19(4 of fluting flush end holding screw), magnetic core 20(8), magnet exciting coil 21(8), seal washer 22(4). Wherein, circular cylindrical shell 1, outside housing 2, interior side body 5, bearing sleeve 17 form field frame assembly. Circular cylindrical shell 1, outside housing 2, interior side body 5 are assembled into stator case. The stator case of the both sides that rotor disk 3 is placed in respectively. Bearing sleeve 17 is between two stator cases, and both sides are separately fixed on two stator cases. Pole shoe 9, magnetic core 20, magnet exciting coil 21 form excitation unit, the center of circle of 8 excitation units lays respectively between the stator case of both sides, be uniformly distributed by two pole shoes 9 on the same reference circle of the interior side body 5 that is fixed on both sides stator case, and the magnetic pole of two adjacent excitation units is always contrary.
As shown in Figure 2 and Figure 3, on interior side body 5, have steam vent 24, have liquid injection hole 23 on outside housing 2, liquid injection hole 23, steam vent 24 are blocked by fluting tack holding screw 19. After retarder installs, can take out fluting tack holding screw 19, magnetic flow liquid 4 is filled in uniformly in the gap of rotor disk 3 and stator case, replace the air gap between rotor disk 3 and stator case.
Form an excitation unit by two pole shoes 9, magnetic core 20, a magnet exciting coil 21, two pole shoes 9 are symmetrically distributed in the both sides of magnetic core 20, and connect by fluting flush end holding screw 18.
As shown in Fig. 3, Fig. 5, pole shoe 9 is shaped as two vary in size protruding fan-shaped, matches with the groove 25 on the interior side body 5 of stator case, and pole shoe 9 is directly inserted in interior side body 5, and pole shoe 9 is directly contacted with magnetic flow liquid 4. And be screwed, fan-shaped sealing ring 10 seals, and the magnetic flow liquid 4 preventing is revealed.
Circular cylindrical shell 1, outside housing 2, interior side body 5 are connected by screw and are assembled into stator case, wherein circular cylindrical shell 1, outside housing 2, interior side body 5 are all that NULL (as mild steel, aluminium) is made, between interior side body 5 and circular cylindrical shell 1, between outside housing 2 and circular cylindrical shell 1, all seal with seal washer 22, in order to avoid magnetic flow liquid 4 is revealed.
The interior side body 5 of both sides stator case is connected by screw with the both sides of bearing sleeve 17, and a pair of symmetrical inner bearing 11 and sleeve 16 are housed in bearing sleeve 117, and sleeve 16 is for fixing inner bearing 11. The convex shoulder of bearing sleeve 17 inside is for the installation site of definite inner bearing 11, and sleeve 16 is for the position of fixing inner bearing 11.
The bearing cap 8 of both sides is connected with outside housing by screw, the interior outer bearing 13 that is equipped with respectively of bearing cap 8.
Between rotor disk 3 and power transmission shaft 14, be general flat key 6 and be connected, two check rings 15 are equipped with respectively in the both sides of rotor disk 3, for the axial location of fixed rotor dish 3.
Outer lip-type packing 7 and interior lip-type packing 12, for the axial seal of stator case, prevent the axial both sides leakage of magnetic flow liquid 4 from stator case. Outer lip-type packing 7 is arranged in the groove of outside housing 2, and the other end is fixed by bearing cap 8, and interior lip-type packing 12 is arranged in the groove of interior side body 5, and the other end is fixed by the shaft shoulder of power transmission shaft 14.
As shown in Figure 4, there are respectively two screwed holes 26 both sides of circular cylindrical shell 1, for being connected with outer stator.
As shown in Figure 6, under non-on-position, magnet exciting coil 21 no powers, in device, exist without magnetic field, now, magnetic flow liquid 4 is Newtonian fluids that viscosity pole is low, the drag minimization that rotor disk 3 rotates, Braking Action None, so rotor disk 3 rotates freely in stator case. Under on-position, magnet exciting coil 21 is switched on, in device, produce closed-loop path, magnetic field, because stator case is that NULL is made, magnetic circuit is without stator case, so its magnetic conductive loop is: pole shoe 9-3, the magnetic flow liquid 4-2 of magnetic core 20-1, pole shoe 9-1, magnetic flow liquid 4-1, rotor disk 3-1, magnetic flow liquid 4-1, the pole shoe 9-2 of adjacent excitation unit, the magnetic core 20-2 of adjacent excitation unit, adjacent excitation unit, rotor disk 3-2, magnetic flow liquid 4-2, pole shoe 9-4, magnetic core 20-1. Because rotor disk 3 rotates in magnetic field, cutting magnetic field, produces current vortex on rotor disk 3. Current vortex, under the effect in magnetic field, makes rotor disk 3 produce braking moment. Because the electrical conductivity of magnetic flow liquid 4 is extremely low, be equivalent to insulator, so magnetic flow liquid inside does not produce current vortex. Meanwhile, the magnetic flow liquid 4 directly contacting with pole shoe 9, under magnetic fields, is changed into the Bingham fluid with higher shear yield stress by the low Newtonian fluid of viscosity pole, rotor disk 3 is produced to braking moment. Two braking moments act on simultaneously, produce the effect of slow braking.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (5)
1. the electric vortex buffering apparatus based on magnetic rheology effect, it is characterized in that: comprise that a bearing sleeve and is located at the power transmission shaft in bearing sleeve, the two ends of described bearing sleeve are respectively equipped with a stator case, in described stator case, be installed on the rotor disk being connected with power transmission shaft, between described rotor disk and stator case, fill magnetic flow liquid, bearing sleeve periphery between two stator cases is provided with magnetic core, on described magnetic core, have around the home magnet exciting coil, the two ends of described magnetic core are connected through pole shoe and stator case inwall.
2. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 1, is characterized in that: described stator case comprises outside housing, interior side body and circular cylindrical shell.
3. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 2, it is characterized in that: described pole shoe, magnetic core, magnet exciting coil composition excitation unit, and described excitation unit is 8, the center of circle of 8 excitation units lays respectively between the stator case of both sides, the a pair of pole shoe of each excitation unit is uniformly distributed on the same reference circle of the interior side body that is fixed on both sides stator case, and the magnetic pole of two adjacent excitation units is always contrary.
4. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 3, it is characterized in that: described a pair of pole shoe be shaped as two vary in size outstanding fan-shaped, on described interior side body, offer the fan-shaped groove matching with pole shoe, described pole shoe inserts in the fan-shaped groove of interior side body, form with interior side body the disk body sealing, and pole shoe directly contacts with the magnetic flow liquid of filling in stator case.
5. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 2, is characterized in that: on described interior side body, have steam vent, on the housing of outside, have liquid injection hole, liquid injection hole, steam vent are blocked by fluting tack holding screw; There are respectively two screwed holes the both sides of described circular cylindrical shell, for being connected with outer stator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068391.0A CN103807329B (en) | 2014-02-27 | 2014-02-27 | A kind of electric vortex buffering apparatus based on magnetic rheology effect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410068391.0A CN103807329B (en) | 2014-02-27 | 2014-02-27 | A kind of electric vortex buffering apparatus based on magnetic rheology effect |
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| CN103807329A CN103807329A (en) | 2014-05-21 |
| CN103807329B true CN103807329B (en) | 2016-05-04 |
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| CN104565120B (en) * | 2014-12-08 | 2017-03-15 | 中国矿业大学 | A kind of magnetic flow liquid becomes torquer |
| CN111907336A (en) * | 2019-05-09 | 2020-11-10 | 株洲中车时代电气股份有限公司 | Eddy current brake, control device of eddy current brake and magnetic suspension train |
| DE102019135760A1 (en) * | 2019-12-18 | 2021-06-24 | Inventus Engineering Gmbh | Magnetorheological braking device |
| CN111175108B (en) * | 2020-03-01 | 2022-09-02 | 东北石油大学 | Ultra-low permeability natural core pillar electrode and pressure measuring point arrangement pouring method |
| CN112128276B (en) * | 2020-09-09 | 2022-06-14 | 常州机电职业技术学院 | Electromagnetic hydraulic composite braking retarding device and braking method thereof |
| CN112319233B (en) * | 2020-10-13 | 2022-03-22 | 江苏大学 | Eddy current-magnetorheological fluid composite brake and brake control method thereof |
| CN113629966A (en) * | 2021-08-11 | 2021-11-09 | 东南大学 | Axial flux permanent magnet motor integrated with magnetorheological fluid braking structure |
| US11599136B1 (en) * | 2022-01-11 | 2023-03-07 | Dell Products L.P. | Magnetorheological fluid (MRF) rotary damper for adaptive user input device |
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| CN2851003Y (en) * | 2005-11-30 | 2006-12-27 | 深圳市特尔佳运输科技有限公司 | Central electric eddy speed damper |
| CN202071705U (en) * | 2011-05-26 | 2011-12-14 | 华中科技大学 | Eddy current retarder with big braking torque |
| CN103057427A (en) * | 2013-01-08 | 2013-04-24 | 清华大学 | Magneto-rheological hydraulic brake executing device for electric vehicles |
| CN203702930U (en) * | 2014-02-27 | 2014-07-09 | 福州大学 | Efficient eddy current retarder |
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2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5842547A (en) * | 1996-07-02 | 1998-12-01 | Lord Corporation | Controllable brake |
| CN2851003Y (en) * | 2005-11-30 | 2006-12-27 | 深圳市特尔佳运输科技有限公司 | Central electric eddy speed damper |
| CN202071705U (en) * | 2011-05-26 | 2011-12-14 | 华中科技大学 | Eddy current retarder with big braking torque |
| CN103057427A (en) * | 2013-01-08 | 2013-04-24 | 清华大学 | Magneto-rheological hydraulic brake executing device for electric vehicles |
| CN203702930U (en) * | 2014-02-27 | 2014-07-09 | 福州大学 | Efficient eddy current retarder |
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