CN103057427A - Magneto-rheological hydraulic brake executing device for electric vehicles - Google Patents
Magneto-rheological hydraulic brake executing device for electric vehicles Download PDFInfo
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- CN103057427A CN103057427A CN201310007233XA CN201310007233A CN103057427A CN 103057427 A CN103057427 A CN 103057427A CN 201310007233X A CN201310007233X A CN 201310007233XA CN 201310007233 A CN201310007233 A CN 201310007233A CN 103057427 A CN103057427 A CN 103057427A
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- 230000005291 magnetic effect Effects 0.000 claims abstract description 81
- 239000007788 liquid Substances 0.000 claims abstract description 54
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- 238000005859 coupling reaction Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 1
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- 238000006243 chemical reaction Methods 0.000 description 4
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- 238000010008 shearing Methods 0.000 description 4
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- 238000004134 energy conservation Methods 0.000 description 2
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- 235000009566 rice Nutrition 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 230000007423 decrease Effects 0.000 description 1
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- 239000012467 final product Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention relates to a magneto-rheological hydraulic brake executing device for electric vehicles and belongs to the technical field of electric vehicles. The magneto-rheological hydraulic brake executing device comprises a driving shaft, a brake disk, magneto-rheological liquid, a shell, an electromagnetic coil, connecting plates and a support structure from the inside to the outside. The driving shaft and the brake disk are fixedly connected with a spline and transmit torque to wheels. A left shell piece and a right shell piece are integrally connected through bolts, the brake disk is horizontally disposed in the shell, and the magneto-rheological liquid is filled into the shell. The electromagnetic coil takes an iron core as a support, is limited and fixed by bolts distributed on the support and fits with the outer surface of the shell to form a magnetic loop. The support structure comprises a left portion and a right portion, is fixedly connected with a car body, transmits brake force to the vehicle body, supports the electromagnetic coil through bolts and fixes the brake structure by bolts. The magneto-rheological hydraulic brake executing device is simple and compact in structure, accordant with requirements of the vehicles, capable of setting pressure at millisecond magnitude and convenient to adjust and can meet the requirements for brake strength of the vehicles.
Description
Technical field
The present invention relates to a kind of magnetic flow liquid braking executive device for electronlmobil, belong to field of automobile.
Background technology
Traditional automobile has adopted hydraulic brake system, and its brake actuator has comprised the brake piping that brake pedal, vacuum booster, master cylinder, quadruplet plate disc brake, hydraulic control unit, ECU (Electrical Control Unit), master cylinder are connected with hydraulic control unit and the brake piping that connects hydraulic control unit and each car side brake.The orthodox car brake system is after chaufeur is run into brake pedal, reach along with brake pedal, vacuum booster utilizes engine back pressure to carry out power-assisted, the reach of promotion master cylinder piston, after the gap in the master cylinder and brake clearance elimination, in the drg of each wheel, produce brake fluid pressure gradually.The time delay that 0.2s to 0.9s is arranged usually is called the drg in-service time during this period of time.
Along with the development of electronlmobil and hybrid vehicle, line control brake system as the 4th generation brake system of car become the focus of research.The braking function that perfect line control brake system not only can provide the traditional braking system to provide, and more meet automotive safety and energy-conservation requirement.The brake pedal of line control brake system and brake actuator are decoupling zeros, and during conventional brake, line control brake system can provide brake efficiency and the brake feel with the traditional braking systems compliant.When vehicle needs to brake when intervening in the process of moving, line control brake system is independent of chaufeur and implements voluntarily braking, has cancelled time of driver's reaction, and rate of pressurization is compared the traditional braking system also can be faster, thereby improved the safety of driving.
In the development process of electronlmobil, because the cancellation of driving engine, the required vacuum source condition of brake system can not satisfy at present, and vacuum booster can't work.Extract vacuum source if increase simultaneously vacuum pump, then can roll up the layout of A0 level vehicle and the complexity of coupling.Based on above problem, line control system has obtained application, mainly contains at present two kinds of EHB and electromechanical braking systems, but both at present all relatively poor the and working accuracy of existence and stability be difficult to meet the requirements of problem and be difficult to promote.
The domestic research of also carrying out a small amount of magneto-rheologic liquid brake, but consider that Brake for vehicle belongs to safe parts important on the automobile must reach the lock torque of thousand Ns of rice magnitudes and reach reaction time of millisecond magnitude.Magneto-rheologic liquid brake is domestic a small amount of research, disclosed patented technology (200910099608.3) has proposed the general structure of phase transformation drg at present, but electrorheological fluid material far can not reach required braking force, when it does not consider magnetic flow liquid as braking liquid simultaneously, the generation of external trigger signal (magnetic field).The magneto-rheologic liquid brake structurally variable of patented technology (03141793.0) design, but magnet coil supports with inner core, has significantly reduced coil and has produced the magnetic field ability.When increasing disc thickness, it is large that magnetic resistance becomes simultaneously, and magnetic field descends rapidly, and brake torque declines to a great extent, and can not be applied on the automobile.Patented technology (200410084576.7) is a kind of drg of coil internally-arranged type, has the advantages such as moment is large, but because the magnetic flow liquid mode of operation can be to coil wearing and tearing and energising inconvenience, life-span and the electrical safety of equipment are more limited.Patented technology (201020620713.5) adopts permanent magnet as Magnetic Field Source, have energy-conservation characteristics, but when braking and the conversion of non-braking mode, need to operate magnet, operating mechanism complexity and magnetic pole are long transfer time, can't realize the car brakeing requirement.
Summary of the invention
The objective of the invention is to propose a kind of magnetic flow liquid braking executive device for electronlmobil, change the structure of existing automobile-used braking executive device, the mechanisms such as cancellation vacuum servo improve the control effect simultaneously.
The magnetic flow liquid braking executive device that is used for electronlmobil that the present invention proposes comprises brake disc, magnetic flow liquid, left shell, right shell body, electromagnet core, magnet coil, left terminal pad, right terminal pad and U-shaped stay bearing plate; Described left shell and right shell body are circular, and left shell is relative with the housing tie bolt with housing coupling nut on the right shell body circumference to form housing after fixing by being distributed on for left shell and right shell body, and described brake disc and magnetic flow liquid place in the housing; Forming the left shell of housing and the center of right shell body is boss, housing the central boss part be supported on by left terminal pad, right terminal pad and housings support bolt U-shaped stay bearing plate upper end conglobate about between two hold-down arms; The end of described transmission shaft is supported on the center of housing boss by angular contact bearing, and is supported on the U-shaped stay bearing plate by deep groove ball bearing; Described magnet coil is wrapped in and forms electromagnet on the electromagnet core, be evenly equipped with respectively six groups of electromagnet along circumference in the space, housing both sides between housing and the left support plate and between housing and the right support plate, electromagnet by the electromagnet staybolt be supported on U-shaped stay bearing plate upper end conglobate about between two hold-down arms.
The magnetic flow liquid braking executive device that is used for electronlmobil that the present invention proposes, system compares with traditional braking, and its advantage is to have clear superiority on the cost.Self control principle of braking executive device of the present invention is to change driving surface magnetic field size by current control, and then change the size of shearing force, thereby compare with the traditional braking system, brake fluid pressure is controlled continuously, braking procedure is steady, without the noise of motor and high-pressure oil passage generation.In addition because brake pedal and brake actuator are decoupling zeros, thereby can carry out ACTIVE CONTROL, after this mechanism receives emergency brake signal, energising can produce braking force, its response time is Millisecond even shorter, replaced time of driver's reaction relatively long in the traditional vacuum power-assisted hydraulic brake system, the process that is increased to simultaneously maximum rate of braking only needs magnetic flow liquid to form the time of magnetic linkage, this just saves time for braking procedure, can for shortening the automobile brake distance under the emergency braking operating mode, to improving traffic safety very important effect be arranged.This patent has carried out refinement and magnetic circuit check to magnetic circuit in addition, guarantee that the size in magnetic field is also so that magnetic flow liquid produces enough shearing stresses, the brake friction face adopts ferromagnetic material to guarantee that the magnetic flow liquid material wall slippage can not occur simultaneously, therefore the actual lock torque that produces can reach thousand Ns of rice magnitudes, considerably beyond existing patent level, can be applied at automobile.0 viscosity of magnetic flow liquid that adopts is little, thereby the viscous resistance that produces under the state of nature that does not add magnetic field can be accepted fully.Generally, the magneto-rheologic liquid brake actuating unit, parts machining is simple, various aspects of performance is better, the difficulty that can effectively avoid China's precise hydraulic brake regulation system to face is opened up the variation route of an electronlmobil brake safe technology, has good application prospect.
Description of drawings
Fig. 1 is the structural representation of the magnetic flow liquid braking executive device that is used for electronlmobil that proposes of the present invention.
Fig. 2 is the A-A cutaway view of Fig. 1.
Fig. 3 is the External view of the magnetic flow liquid braking executive device that is used for electronlmobil that proposes of the present invention.
Among Fig. 1-Fig. 3, the 11st, brake disc, the 12nd, magnetic flow liquid inlet, the 13rd, magnetic flow liquid, the 14th, left shell, the 15th, right shell body, 15a is the boss of right shell body, the 16th, and seal ring, the 17th, transmission shaft, the 18th, end ring, the 19th, angular contact bearing, the 110th, magnetic flow liquid flow export, the 111st, housing coupling nut, the 112nd, the housing tie bolt, the 113rd, housing seal pad, the 21st, U-shaped stay bearing plate, the 22nd, left terminal pad, the 23rd, right terminal pad, the 24th, deep groove ball bearing, the 25th, housings support bolt, the 31st, electromagnet staybolt, the 32nd, electromagnet core, the 33rd, magnet coil.
Fig. 4 is that the electromagnet pole of the magnetic flow liquid braking executive device that is used for electronlmobil that proposes of the present invention distributes.
Fig. 5 is the electromagnet magnetic circuit scheme drawing of the magnetic flow liquid braking executive device that is used for electronlmobil that proposes of the present invention.
Fig. 6 is the contrast scheme drawing that uses the braking force growth curve of the brake system of brake actuator of the present invention and traditional vacuum power-assisted hydraulic brake system under the emergency braking operating mode.
The specific embodiment
The magnetic flow liquid braking executive device that is used for electronlmobil that the present invention proposes, its structure mainly comprises brake disc 11, magnetic flow liquid 13, left shell 14, right shell body 15, electromagnet core 32, magnet coil 33, left terminal pad 22, right terminal pad 23 and U-shaped stay bearing plate 21 as shown in Figure 1.Shown in the AA cutaway view of Fig. 2, left shell 14 and right shell body 15 are circular, housing coupling nut 111 on left shell 14 and right shell body 15 circumference and housing tie bolt 112 are relative to form housings after fixing by being distributed on for left shell 14 and right shell body 15, and described brake disc 11 and magnetic flow liquid 13 place in the housing.Forming the left shell 14 of housing and the center of right shell body 15 is boss, housing central boss 15a part be supported on by left terminal pad 22, right terminal pad 23 and housings support bolt 25 U-shaped stay bearing plate 21 upper ends conglobate about between two hold-down arms.The end of transmission shaft 17 is supported on the center 15a of housing boss by angular contact bearing 19, and is supported on the U-shaped stay bearing plate 21 by deep groove ball bearing 24.Magnet coil 33 is wrapped on the electromagnet core 32 and forms electromagnet, be evenly equipped with respectively six groups of electromagnet along circumference in the space, housing both sides between housing and the left support arm and between housing and the right support arm, electromagnet by electromagnet staybolt 31 be supported on U-shaped stay bearing plate 21 upper ends conglobate about between two hold-down arms.The whole three-dimensional structure of the magnetic flow liquid braking executive device that is used for electronlmobil that the present invention proposes as shown in Figure 3.
The magnetic flow liquid braking executive device that is used for electronlmobil that the present invention proposes comprises that main body drg, uniform strong magnetic field generating portion and support structure fix three parts.
Described main body drg is axially symmetric structure, and transmission shaft 17 has spline and brake disc 11 interference fit, has seal groove and is used for laying seal ring 16.Brake disc 11 is the thin disk of steel, be positioned at the centre plane of left shell 14 and right shell body 15, magnetic flow liquid 13 full rates are 90% in the cavity, reduce the impact of magnetic flow liquid 13 het expansions, magnetic flow liquid 13 enters cavity and flow export 110 discharge cavitys by the upper inlet 12 of right shell body 15, magnetic flow liquid 13 side seals are seal ring 16 on a pair of transmission shaft, and radial seal is that the housing seal pad 113 of 15 of left shell 14 and right shell bodies is realized.
Described support structure fixed part mainly plays and supports and the effect that is connected, and as shown in Figure 3, two hold-down arms of U-shaped stay bearing plate 21 upper end circles are by left terminal pad 22, right terminal pad 23 and housings support bolt 25 supportive body drgs.Stay bearing plate 21 is connected with vehicle body, transmits brake torque.
Described uniform strong magnetic field generating portion mainly is for generation of uniform strong magnetic field, magnet coil 33 forms electromagnet take electromagnet core 32 as support, the six pairs of electromagnet by electromagnet staybolt 31 be supported on U-shaped stay bearing plate 21 upper ends conglobate about between two hold-down arms.As shown in Figure 4, opposed left shell 14 and right shell body 15 surfaces of being distributed in of electromagnet, the electromagnet one side is fitted with housing outer surface, one side is fitted with the bearing surface of U-shaped stay bearing plate 21, fastening by 12 Bolt to positions on the U-shaped stay bearing plate, the relative electromagnet that is arranged as of magnetic pole is that N, S level are relative, and adjacent electromagnet is that N, S level are alternate.
Figure 5 shows that the scheme drawing of integral structure magnetic circuit, every pair of opposed electromagnet produces and produces therebetween uniform strong magnetic field, produces altogether 6 high magnetic field areas as magnetic flow liquid 13 work capacity sources.A pair of electromagnet is example take the centre, after magnetic line of force results from this a pair of electromagnet, form uniform magnetic field at zone line, then magnetic line of force enters U-shaped stay bearing plate 21, being divided into two-way enters in two pairs of adjacent electromagnet, and in these two pairs of electromagnet, producing uniform magnetic field, last magnetic line of force is again by getting back in the former electromagnet behind the U stay bearing plate 21.
The specific works process of drg executive device of the present invention:
When not braking, six pairs of electromagnet outages, magnetic flow liquid 13 flows with the minimum liquid form of stickiness.In order to prevent that magnetic flow liquid 13 from leaking outside, between magnetic flow liquid 13 and transmission shaft 17, be provided with seal ring 16, between the housing of the left and right sides, be provided with housing seal pad 113.Brake disc 11 rotates at the same rate with wheel under the drive of axle drive shaft 17, and magnetic flow liquid 13 produces a small amount of viscous resistance.During braking, along with chaufeur is stepped on brake pedal, electric current increases gradually in the electromagnet, and magnetic field is strengthened gradually in the magnetic flow liquid 13, and inner magnetic linkage produces gradually chap and twists together.Brake disc 11 produces relative motion with left shell 14, right shell body 15 inwalls, constantly destroys and tears magnetic linkage generation shearing resistance, slows down the rotating speed of brake disc 11, finally causes the speed of a motor vehicle to descend gradually.After braking is finished, current reduction or directly outage, magnetic flow liquid 13 is because magnetic field reduces the working fluid state that recovers, and braking force disappears; Force when moving, electric current adds to maximum in the electromagnet, and magnetic field moment reaches the strongest.Magnetic flow liquid 13 forms rapidly magnetic linkage and is braked dish 11 drive failures in the millisecond magnitude and tears, and this moment, shearing force reached maximum, and vehicle reaches maximum braking deceleration; Chaufeur is when grade braking, and after actuating unit detected speed-slackening signal, the electric current of electromagnet was added to maximum, and under maximum field, magnetic linkage forms rapidly, has larger yield stress.At this moment, yield stress is greater than the partical gravity in 30 degree ramps, and vehicle can be stablized the realization grade braking and not come down.
In addition, pass through the control size of current during braking, the size of regulating brake braking force easily, by increasing size of current, keep electric current, reduce supercharging, pressurize, decompression action that electric current has replaced the system works such as ABS, ESC, thereby realize the function of the systems such as ABS, ESC simple and reliablely.
Aspect maintenance of equipment, when needing to add liquid, turn on the bolt of the magnetic flow liquid inlet 12 of left shell 14 tops, inject magnetic flow liquid 13 from tapped bore.In the time of need to emitting liquid, turn on the bolt of the magnetic flow liquid flow export 110 of left shell 14 belows, emit magnetic flow liquid 13 from tapped bore.When needing to change magnetic circuit, successively housings support bolt 25 is pulled down, can be taken out U-shaped stay bearing plate 21, electromagnet structure is removed along with U-shaped stay bearing plate 21 immediately, gets final product flexible arrangement magnetic circuit and repair structure leak, and does not need mobile and change main body brake structure.
The brake actuator that patent of the present invention proposes decreases than traditional braking device on braking time, as shown in Figure 6: brake the moment of intention as initial point take generation, it is t2 that traditional vacuum power-assisted hydraulic brake system hydraulic pressure increases time of origin, and t4 is stable at target braking force in the time.During emergency braking, for the consideration of shortening stopping distance, for the brake system of using brake actuator of the present invention, can be by the control of electromagnet 32 electric currents be realized this goal: after receiving emergency brake signal, improve the size of current in the coil 32, magnetic flow liquid just can produce braking force, response time is that Millisecond has replaced time of driver's reaction relatively long in the traditional vacuum power-assisted hydraulic brake system, job initiation time of using brake actuator of the present invention is advanceed to tl by the t2 of traditional vacuum power-assisted hydraulic brake system, save the time of △ t1 for the overall process of emergency braking.Because it is different that brake actuator braking force of the present invention increases with the braking force growth principle of legacy system, it is faster that magnetic linkage produces speed, and this can save a period of time for the emergency braking overall process again, shown in △ t2 among Fig. 6.The time of the △ tl+ △ t2 that saves altogether, automobile brake distance when having reduced emergency braking.
Should be noted that at last, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to concrete embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (1)
1. a magnetic flow liquid braking executive device that is used for electronlmobil is characterized in that this braking executive device comprises brake disc, magnetic flow liquid, left shell, right shell body, electromagnet core, magnet coil, left terminal pad, right terminal pad and U-shaped stay bearing plate; Described left shell and right shell body are circular, and left shell is relative with the housing tie bolt with housing coupling nut on the right shell body circumference to form housing after fixing by being distributed on for left shell and right shell body, and described brake disc and magnetic flow liquid place in the housing; Forming the left shell of housing and the center of right shell body is boss, housing the central boss part be supported on by left terminal pad, right terminal pad and housings support bolt U-shaped stay bearing plate upper end conglobate about between two hold-down arms; The end of described transmission shaft is supported on the center of housing boss by angular contact bearing, and is supported on the U-shaped stay bearing plate by deep groove ball bearing; Described magnet coil is wrapped in and forms electromagnet on the electromagnet core, be evenly equipped with respectively six groups of electromagnet along circumference in the space, housing both sides between housing and the left support plate and between housing and the right support plate, electromagnet by the electromagnet staybolt be supported on U-shaped stay bearing plate upper end conglobate about between two hold-down arms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310007233.XA CN103057427B (en) | 2013-01-08 | 2013-01-08 | Magneto-rheological hydraulic brake executing device for electric vehicles |
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| CN201310007233.XA CN103057427B (en) | 2013-01-08 | 2013-01-08 | Magneto-rheological hydraulic brake executing device for electric vehicles |
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| CN103057427A true CN103057427A (en) | 2013-04-24 |
| CN103057427B CN103057427B (en) | 2015-04-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103465789A (en) * | 2013-09-16 | 2013-12-25 | 浙江师范大学 | Buffer brake |
| CN103807329A (en) * | 2014-02-27 | 2014-05-21 | 福州大学 | Eddy current retarder device based on magnetorheological effect |
| CN107959402A (en) * | 2017-12-22 | 2018-04-24 | 长安大学 | A kind of contactless electromagnetic brake |
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2013
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| US20020074196A1 (en) * | 2000-12-14 | 2002-06-20 | Il-Rae Park | Automobile brake device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103465789A (en) * | 2013-09-16 | 2013-12-25 | 浙江师范大学 | Buffer brake |
| CN104999918A (en) * | 2013-09-16 | 2015-10-28 | 浙江师范大学 | Auxiliary speed reduction assembly for buffer brake |
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| CN103807329A (en) * | 2014-02-27 | 2014-05-21 | 福州大学 | Eddy current retarder device based on magnetorheological effect |
| CN103807329B (en) * | 2014-02-27 | 2016-05-04 | 福州大学 | A kind of electric vortex buffering apparatus based on magnetic rheology effect |
| CN107959402A (en) * | 2017-12-22 | 2018-04-24 | 长安大学 | A kind of contactless electromagnetic brake |
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| CN103057427B (en) | 2015-04-15 |
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