CN113446332A - Self-boosting type magnetorheological fluid braking device - Google Patents
Self-boosting type magnetorheological fluid braking device Download PDFInfo
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- CN113446332A CN113446332A CN202011126626.9A CN202011126626A CN113446332A CN 113446332 A CN113446332 A CN 113446332A CN 202011126626 A CN202011126626 A CN 202011126626A CN 113446332 A CN113446332 A CN 113446332A
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- 239000012530 fluid Substances 0.000 title claims abstract description 65
- 238000007789 sealing Methods 0.000 claims abstract description 65
- 230000005540 biological transmission Effects 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims 2
- 239000007788 liquid Substances 0.000 abstract description 8
- 239000007787 solid Substances 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005389 magnetism Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 101100190529 Arabidopsis thaliana PIN7 gene Proteins 0.000 description 2
- 108010059419 NIMA-Interacting Peptidylprolyl Isomerase Proteins 0.000 description 2
- 101100190532 Oryza sativa subsp. japonica PIN9 gene Proteins 0.000 description 2
- 102100026114 Peptidyl-prolyl cis-trans isomerase NIMA-interacting 1 Human genes 0.000 description 2
- 102000007315 Telomeric Repeat Binding Protein 1 Human genes 0.000 description 2
- 108010033711 Telomeric Repeat Binding Protein 1 Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 108010037490 Peptidyl-Prolyl Cis-Trans Isomerase NIMA-Interacting 4 Proteins 0.000 description 1
- 102100031653 Peptidyl-prolyl cis-trans isomerase NIMA-interacting 4 Human genes 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
- F16D57/002—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders comprising a medium with electrically or magnetically controlled internal friction, e.g. electrorheological fluid, magnetic powder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Braking Arrangements (AREA)
Abstract
本发明公开一种自增力式磁流变液制动装置，包括壳体、车轴和制动轴，所述车轴设于制动轴内一同转动，所述壳体由左右底板以及侧板围成一个圆筒状工作腔，所述车轴和制动轴穿过左右底板设置在工作腔内，所述工作腔内还设有两组对称的磁流变制动单元和一个密封筒，所述密封筒以制动轴为中心，并设在两组磁流变制动单元之间。本发明利用线圈产生的磁场直接作用于磁流变液，密封腔内的磁流变液被磁化瞬间由液态变为固态，从而将制动轴与转动盘之间连接起来，转动盘带动传动轮反向转动，传动轮转动时对盘加压块产生了制动压力，使得所有加压模块整体反转，进而会对密封腔内部的磁流变液进行加压，增加磁流变液对制动盘的制动力矩。
The invention discloses a self-energizing magnetorheological fluid brake device, which comprises a casing, an axle and a brake shaft. The axle is arranged in the brake shaft to rotate together, and the casing is surrounded by left and right bottom plates and side plates. into a cylindrical working cavity, the axle and the brake shaft are arranged in the working cavity through the left and right bottom plates, and two sets of symmetrical magnetorheological braking units and a sealing cylinder are also arranged in the working cavity. The sealing cylinder is centered on the braking shaft and is arranged between two sets of magnetorheological braking units. The invention utilizes the magnetic field generated by the coil to directly act on the magnetorheological fluid, and the magnetorheological fluid in the sealed cavity is instantly magnetized from a liquid state to a solid state, thereby connecting the brake shaft and the rotating disc, and the rotating disc drives the transmission wheel Reverse rotation, when the transmission wheel rotates, a braking pressure is generated on the disc pressure block, so that all the pressure modules are reversed as a whole, which in turn will pressurize the magnetorheological fluid inside the sealed cavity, increasing the magnetorheological fluid to counteract the pressure. Braking torque of the disc.
Description
Technical Field
The invention belongs to the field of automobile braking, and particularly relates to a self-boosting type magnetorheological fluid braking device.
Background
The magnetorheological fluid is widely applied to the fields of aerospace, machining, construction, medical treatment and the like due to the advantages of fast reaction (millisecond level), low energy consumption, easiness in control, good durability, wide working temperature range, long service life and the like.
The brake device can be conveniently manufactured by utilizing the characteristics of the magnetorheological fluid, but the brake device manufactured by the magnetorheological fluid only can use the shear stress of the brake device and can generate smaller brake force, so that the brake device cannot meet the brake requirements of large equipment such as a new energy automobile. The invention discloses a conical extrusion-shear type magnetorheological clutch, wherein an iron core input disc is fixed at the front end of an input shaft, an armature output disc which slides along the axial direction is arranged at the front end of an output shaft, or the armature input disc which slides along the axial direction is arranged at the front end of the input shaft, the iron core output disc is fixed at the front end of the output shaft, a cavity is formed between the iron core input disc and the armature output disc, magnetorheological fluid is filled in the cavity, a sealing ring which seals the magnetorheological fluid in the cavity is arranged on the periphery of the cavity, a coil which drives the armature output disc to move towards the iron core input disc in the axial direction is further arranged in the working cavity, and an adjusting device which is used for adjusting the volume of the cavity is further arranged between the iron core input disc and the armature output disc. The invention has the advantages that when the clutch is in a working state, the magnetic field generated by the coil is utilized to attract the armature output disc, the volume of the containing cavity is reduced, meanwhile, extrusion and shearing force are generated on the magnetorheological fluid, larger torque can be transmitted, and the invention has small volume, reliable performance, compact structure and good effect. However, the armature used by the clutch is large and heavy, and is not beneficial to light-weight production of the braking device.
Disclosure of Invention
The invention aims to solve the technical problems and provides a self-boosting magnetorheological fluid braking device with light weight and large braking torque.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a self-boosting magnetorheological fluid braking device comprises a shell, an axle and a braking shaft, wherein the axle is arranged in the braking shaft and rotates together, the shell is surrounded by a left bottom plate, a right bottom plate and a side plate to form a cylindrical working cavity, the axle and the braking shaft penetrate through the left bottom plate and the right bottom plate to be arranged in the working cavity, two groups of symmetrical magnetorheological braking units and a sealing cylinder are further arranged in the working cavity, the sealing cylinder takes the braking shaft as the center and is arranged between the two groups of magnetorheological braking units, the magnetorheological braking units comprise a magnetic conduction module, a rotating disc, a plurality of transmission gears and a pressurization module, the magnetic conduction module and the rotating disc are sequentially arranged from outside to inside by taking the braking shaft as the center, the magnetic conduction module is arranged on the braking shaft, a gear-shaped inner cavity is arranged at the center of the rotating disc, a first annular groove which is clamped with the sealing cylinder and can rotate relatively is arranged on the outer ring of the gear-shaped inner cavity, assembling the magnetic conduction module, the rotating disc and the sealing cylinder to form a sealing cavity for containing magnetorheological fluid; the side surface of the sealing cylinder is provided with a fixing strip, and the sealing cylinder is fixedly connected with the side plate through the fixing strip, so that the sealing cylinder and the rotating disc are positioned in a suspended manner; the outer ring of the rotating disc is of a gear structure, the transmission gears are uniformly distributed on the outer ring of the rotating disc and are meshed with the outer ring of the rotating disc, a gear fixing rod is arranged at the center of each transmission gear, and the gear fixing rods are fixedly connected with the corresponding bottom plates; the pressurizing modules are respectively arranged on the same side of the transmission gear, each pressurizing module is formed by sequentially connecting a disc pressurizing block, a connecting rod and a shaft pressurizing block, the disc pressurizing block is arranged beside the transmission gear, sawteeth meshed with the transmission gear are arranged on the disc pressurizing block, and the connecting rod is inserted into the sealing cavity from the side surface of the sealing cylinder and is clamped on the sealing cylinder through the shaft pressurizing block.
As a further technical scheme, the rotating disc and the corresponding bottom plate are respectively provided with a spring fixing rod, and a force limiting spring is arranged between the two spring fixing rods.
As a further technical scheme, the magnetic conduction module comprises a magnetic conduction cavity, a magnetism isolating ring and a coil, the magnetic conduction cavity is a cylindrical cavity surrounded by a first magnetic conduction ring, a second magnetic conduction ring, a third magnetic conduction ring and a fourth magnetic conduction ring, the first magnetic conduction ring is an inner ring of the cylindrical cavity, the second magnetic conduction ring is arranged on the outer side surface of the first magnetic conduction ring, and the third magnetic conduction ring and the fourth magnetic conduction ring are two left and right bottom surfaces of the cylindrical cavity; the first magnetic conductive ring and the third magnetic conductive ring are arranged on the brake shaft, and the magnetism isolating ring is clamped between the fourth magnetic conductive ring and the first magnetic conductive ring.
As a further technical scheme, the fixing strips are symmetrically arranged on the side surface of the sealing cylinder in front and back directions by taking the sealing cylinder as a center.
As a further technical scheme, an annular bulge is arranged on the side face of the first annular groove, and a second annular groove clamped with the annular bulge is arranged at the joint of the sealing cylinder and the rotating disc.
As a further technical scheme, the sealing cylinder is horizontally divided into two vertically symmetrical halves.
As a further technical scheme, the connecting rod is a cylinder.
As a further technical scheme, the disc pressurizing block is L-shaped, and the transmission gear is positioned at the bent part of the L shape; the length and the width of the shaft pressurizing block are both larger than the diameter of a hole formed in the sealing cylinder and used for inserting the connecting rod, and the surface, facing the brake shaft, of the shaft pressurizing block is an arc surface with the same radian as the brake shaft.
As a further technical scheme, the pulling force of the force limiting spring on the rotating disc is greater than the force of the magnetorheological fluid driving the rotating disc to rotate in the non-magnetized state and is less than the force of the magnetorheological fluid driving the rotating disc to rotate in the magnetized state.
As a further technical scheme, 4 transmission gears are arranged in each group of magneto-rheological brake units, and 4 pressurizing modules are arranged.
As a further technical solution, the braking device further includes a coil current control module, the coil current control module includes an external controller, a control circuit, and an output circuit including a coil, the external controller is electrically connected to an input terminal of the control circuit, and an output terminal of the control circuit is electrically connected to the output circuit.
As a further technical solution, the external controller adopts a PLC or a microcontroller.
As a further technical solution, the above control circuit includes a power supply VCC, a three-terminal regulator, a capacitor C1, a capacitor C2, a chip, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, and a resistor R10, where the three-terminal regulator employs AMS1117-5v, the chip employs L9349LF, a VIN pin of the three-terminal regulator is connected to the power supply VCC, a vout (tab) pin of the three-terminal regulator is connected to a VS pin of the chip, and the capacitor C1 and the capacitor C2 are connected across a vout (tab) pin and an adj (gnd) pin of the three-terminal regulator; 4 paths of outputs OUT1, OUT2, OUT3 and OUT4 of the chip respectively correspond to PIN2, PIN9, PIN12 and PIN19, a resistor R1, a resistor R2, a resistor R5 and a resistor R6 are directly connected in series with an output Channel to sample output current, and Channel current detection + led OUT from two ends of the chip is connected with Channel current detection-and an ADC of an external controller to sample output current data; the PINs corresponding to the control signal inputs corresponding to the 4-way outputs, namely IN1, IN2, IN3 and IN4, are PIN17, PIN14, PIN7 and PIN 4; the external controller is connected with the input pin to input a PWM control signal; the resistor R3, the resistor R4, the resistor R7 and the resistor R8 are pull-down resistors of the signal input end, and one end of each pull-down resistor is connected to the control signal input end while the other end is grounded; the EN end, namely PIN16, is an enabling end of the chip, namely the high level is effective, when an external controller outputs the high level, the chip function is activated, R9 is a pull-down resistor of the EN end, and is bridged between EN and GND, and the resistance value is the same as that of four pull-down resistors of a resistor R3, a resistor R4, a resistor R7 and a resistor R8; PIN1, PIN10, PIN11, PIN15, PIN20, and PIN21 are circuit grounds.
As a further technical solution, the output circuit includes a capacitor C3, a capacitor C4, a capacitor C5, a freewheeling diode D1, and a coil, the head end of the coil is connected to the power VCC, the tail end of the coil is connected to the output channel of the control circuit, and a bypass capacitor group consisting of a capacitor C3, a capacitor C4, and a capacitor C5 is connected in parallel to both ends of the power; a freewheeling diode D1 is connected in anti-parallel across the coil.
Compared with the prior art, the invention has the beneficial effects that:
1. the product of the invention has large braking torque.
The magnetic field generated by the coil directly acts on the magnetorheological fluid, the magnetorheological fluid in the sealed cavity is changed from a liquid state to a solid state at the moment of magnetization, the brake shaft is connected with the rotating disc, the rotating disc and the brake shaft 3 rotate in the same direction, so that the driving wheel on the outer ring of the rotating disc is driven to rotate reversely, when the driving wheel rotates, the braking pressure is generated on the disc pressurizing block, all pressurizing modules are integrally reversed, the magnetorheological fluid in the sealed cavity is pressurized, and the solid magnetorheological fluid generates braking torque on the brake shaft, so that the brake is realized. Because the brake of the invention mainly depends on current, the invention can replace the traditional vacuum generating device and is used for new energy automobiles.
2. The invention adopts self-energizing to brake, and the product quality is light.
The magnetorheological fluid is arranged in the rotating disc, the rotating disc is close to the coil and the magnetic conduction ring, the magnetization degree of the magnetorheological fluid and the magnetization effect of the magnetorheological fluid are strong, after the magnetorheological fluid in the rotating disc is magnetized, the magnetorheological fluid in the rotating disc is in contact with the brake shaft, and the center of the rotating disc is a gear-shaped inner cavity, so that the magnetorheological fluid is driven to rotate by the rotating shaft after the magnetorheological fluid is magnetized, the magnetorheological fluid drives the rotating disc to rotate, then the pressurizing module works by the rotation of the rotating disc, the self-energizing braking work is realized, and the rotating torque generated when an automobile runs is more effectively and reasonably converted into the braking torque for stopping the automobile. The left and right bottom plates are provided with bearings matched with the brake shaft in the center during installation and are arranged on the axles of the front wheels or the rear wheels, so that the influence on the speed of the automobile is reduced to the maximum extent.
3. The invention has simple and effective structure.
The rotary disc is fixedly connected with the sealing cylinder by clamping the annular bulge and the second annular groove, and the sealing cylinder and the rotary disc are suspended and positioned by matching with the fixed strip and the side plate of the shell. When the automobile runs normally, the magnetorheological fluid is in a liquid state, the fixing strip is used for preventing the sealing cylinder from rotating, and the rotating disc is driven by the liquid magnetorheological fluid to slightly rotate. When the automobile brakes, the sealing barrel is not rotated by the fixing strip, and the relative rotation of the rotating disc and the sealing barrel is realized by the mode that the annular bulge is connected with the second annular groove in a clamped mode, so that the braking is realized. The fixing strips are symmetrically arranged on the side surface of the sealing cylinder in the front-back direction, so that the most stable positioning effect is realized. The invention adopts a cylinder instead of a rectangle to connect the disc pressurizing block and the shaft pressurizing block, so that the structural relationship of the module for pressurizing the sealing cylinder and the rotating disc can limit the whole pressurizing module. The disc pressurizing module is L-shaped, can receive the pressure of the transmission gear through the saw teeth, and can limit the transmission gear to a certain extent; the length and the width of the shaft pressurizing block are both larger than the diameter of the hole formed by inserting the connecting rod into the sealing cylinder, and the surface of the shaft pressurizing block facing the brake shaft is provided with an arc surface with the same radian as the brake shaft, so that the increased braking force during braking can be more comprehensively and effectively applied to the magnetized magnetorheological fluid, and the braking torque of the magnetorheological fluid on the brake shaft is more comprehensively increased.
4. The invention is convenient for assembly.
In order to improve the assembly efficiency of products, the sealing cylinder is divided into two halves which are symmetrical up and down, so that the pressurizing module is convenient to disassemble and assemble.
Drawings
Fig. 1 is a schematic view of an appearance structure of a self-energizing magnetorheological fluid braking device according to the present invention;
fig. 2 is a schematic view of the internal structure of a self-energizing magnetorheological fluid braking device according to the present invention;
FIG. 3 is a right side view of FIG. 2 with the right base plate omitted;
fig. 4 is a perspective view of the self-energizing magnetorheological fluid braking device without a side plate and a right bottom plate;
FIG. 5 is a schematic view of a magnetorheological brake unit of the present invention;
FIG. 6 is a schematic structural diagram of a magnetic module according to the present invention;
FIG. 7 is an exploded view of the magnetic permeable module of FIG. 6;
FIG. 8 is a schematic view of a rotating disk structure of the present invention;
FIG. 9 is a cross-sectional view A-A of FIG. 8;
FIG. 10 is a schematic view of the sealing cartridge of the present invention;
FIG. 11 is a control schematic of the coil current control module of the present invention;
FIG. 12 is a diagram of an output circuit of the present invention;
FIG. 13 is a control circuit diagram of the present invention.
Reference numerals: 1-shell, 2-axle, 3-brake shaft, 4-bottom plate, 5-side plate, 6-magnetorheological brake unit, 601-magnetic conductive module, 602-rotating disc, 603-transmission gear, 604-gear-shaped inner cavity, 605-first annular groove, 606-fixed strip, 607-gear fixed rod, 608-disc pressing block, 609-connecting rod, 610-shaft pressing block, 611-spring fixed rod, 612-force limiting spring, 613-first magnetic conductive ring, 614-second magnetic conductive ring, 615-third magnetic conductive ring, 616-fourth magnetic conductive ring, 617-magnetism isolating ring, 618-coil, 619-annular bulge, 7-sealing cylinder, 8-second annular groove, 9-external controller, 10-control circuit; a-left, b-right, c-anterior, d-posterior.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited to the scope of the examples.
Example 1:
as shown in fig. 1-5, a self-energizing magnetorheological fluid braking device comprises a housing 1, an axle 2 and a brake shaft 3, wherein the axle 2 is arranged in the brake shaft 3 to rotate together, the housing 1 is enclosed by a left bottom plate 4, a right bottom plate 4 and a side plate 5 to form a cylindrical working cavity, the axle 2 and the brake shaft 3 are arranged in the working cavity through the left bottom plate 4 and the right bottom plate 4, two symmetrical magnetorheological brake units 6 and a sealing cylinder 7 are further arranged in the working cavity, the sealing cylinder 7 is centered on the brake shaft 3 and arranged between the two magnetorheological brake units 6, the magnetorheological brake unit 6 comprises a magnetic conduction module 601, a rotating disc 602, a plurality of transmission gears 603 and a pressurization module, the magnetic conduction module 601 and the rotating disc 602 are sequentially arranged from outside to inside with the brake shaft 3 as the center, the magnetic conduction module 601 is arranged on the brake shaft 3, a gear-shaped inner cavity 604 is arranged at the center of the rotating disc 602, a first annular groove 605 which is clamped with the sealing cylinder 7 and can rotate relatively is arranged on the outer ring of the gear-shaped inner cavity 604, and the magnetic conduction module 601, the rotating disc 602 and the sealing cylinder 7 are assembled to form a sealing cavity for containing magnetorheological fluid; a fixing strip 606 is arranged on the side surface of the sealing cylinder 7, and the sealing cylinder 7 is fixedly connected with the side plate 5 through the fixing strip 606, so that the sealing cylinder 7 and the rotating disc 602 are positioned in a suspended mode; the outer ring of the rotating disc 602 is of a gear structure, the transmission gears 603 are uniformly distributed on the outer ring of the rotating disc 602 and are meshed with the outer ring, a gear fixing rod 607 is arranged at the center of each transmission gear 603, and the gear fixing rods 607 are fixedly connected with the corresponding bottom plate 4; the pressurizing modules are respectively arranged on the same side of the transmission gear 603, each pressurizing module is formed by sequentially connecting a disc pressurizing block 608, a connecting rod 609 and a shaft pressurizing block 610, the disc pressurizing block 608 is arranged beside the transmission gear 603, sawteeth meshed with the transmission gear 603 are arranged on the disc pressurizing block 608, and the connecting rod 609 is inserted into the sealing cavity from the side face of the sealing cylinder 7 and is clamped on the sealing cylinder 7 through the shaft pressurizing block 610. The rotating disc 602 and the corresponding bottom plate 4 are respectively provided with a spring fixing rod 611, and a force limiting spring 612 is arranged between the two spring fixing rods 611. The fixing strips 606 are symmetrically arranged on the side surfaces of the sealing cylinder 7 in front and back directions by taking the sealing cylinder 7 as a center, so that the most stable positioning effect is realized. The sealing cylinder 7 is horizontally divided into two symmetrical halves, so that the pressurizing module can be conveniently disassembled and assembled. The connecting rod 609 is a cylinder, and a limit is realized on the whole pressurizing module by the structural relation of the module for pressurizing the sealing cylinder 7 and the rotating disc 602. The disc pressurizing block 608 is L-shaped, and the transmission gear 603 is positioned at the bent part of the L-shape, so that the pressure of the transmission gear can be received through the saw teeth, and the transmission gear can be limited to a certain extent; the length and the width of the shaft pressurizing block 610 are both larger than the diameter of a hole formed by inserting the connecting rod 609 in the sealing cylinder 7, and the surface of the shaft pressurizing block 610 facing the brake shaft 3 is an arc surface with the same radian as the brake shaft 3, so that the increased braking force can be more comprehensively and effectively applied to the magnetized magnetorheological fluid during braking, and the braking torque of the magnetorheological fluid on the brake shaft 3 is more comprehensively increased. The tension of the force limiting spring 612 on the rotating disc is greater than the force of the magnetorheological fluid driving the rotating disc 602 to rotate in the non-magnetized state, so that the rotating disc 602 in the normal driving state is not affected by the magnetorheological fluid, and is less than the force of the magnetorheological fluid driving the rotating disc 602 to rotate in the magnetized state, so as to ensure the braking. The transmission gears 603 of each group of the magnetorheological brake units 6 are 4, and the pressurizing modules are 4.
As shown in fig. 6-7, the magnetic conducting module 601 includes a magnetic conducting cavity, a magnetism isolating ring 617 and a coil 618, the magnetic conducting cavity is a cylindrical cavity surrounded by a first magnetic conducting ring 613, a second magnetic conducting ring 614, a third magnetic conducting ring 615 and a fourth magnetic conducting ring 616, the first magnetic conducting ring 613 is an inner ring of the cylindrical cavity, the second magnetic conducting ring 614 is disposed on an outer side surface of the first magnetic conducting ring 613, and the third magnetic conducting ring 615 and the fourth magnetic conducting ring 616 are two left and right bottom surfaces of the cylindrical cavity; the first magnetic conductive ring 613 and the third magnetic conductive ring 615 are mounted on the brake shaft 3, and the magnetism isolating ring 617 is clamped between the fourth magnetic conductive ring 616 and the first magnetic conductive ring 613.
As shown in fig. 8-9, an annular protrusion 619 is disposed on a side surface of the first annular groove 605, a second annular groove 8 clamped with the annular protrusion 619 is disposed at a joint of the sealing cylinder 7 and the rotary disc 602, so that the rotary disc 602 and the sealing cylinder 7 are fixedly connected, and the fixing strip 606 is fixedly connected with the side plate 5 of the housing 1, so that the sealing cylinder 7 and the rotary disc 602 are suspended and positioned.
Example 2:
as shown in fig. 11, based on embodiment 1, the circuit of the present invention includes a coil current control module, the coil current control module includes an external controller 9, a control circuit 10 and an output circuit including a coil 618, the external controller 9 is electrically connected to an input terminal of the control circuit 10, and an output terminal of the control circuit 10 is electrically connected to the output circuit.
The external controller 9 can be controlled by various PLCs, microcontrollers or other controllers, and the invention takes a mature Arduino development board as an example for controlling the output of the channel 1 by the controller; a development board digital signal output port 9 is used as an output port of a PWM control signal and is connected to a signal Input port 1 (Input channel-1-PWM in fig. 5) of the control circuit 10; the digital signal port 10 of the development board is connected with the Enable terminal (Enable pin in fig. 5) of the control circuit 10, and the control port 10 outputs high and low levels to control whether the power driving chip works or not. The analog signal port a0 of the Arduino development board is connected to the current sampling output port of the control circuit 10, and the voltage across the sampling resistor is read by the ADC inside the Arduino development board to obtain the current magnitude information.
As shown in fig. 13, since the maximum current required for the operation of the magnetorheological brake is 3A, the control circuit 10 uses the power control chip L9349LF of the ideological semiconductor as a core device, and the maximum load current of the power control chip L9349LF is 5A, which can fully meet the control requirement of the magnetorheological brake. The working voltage of the chip is 4.5-32V, 4 output channels capable of being independently controlled are provided, and the duty ratio of the input PWM signal can be controlled to conveniently control the load current so as to control the brake to brake.
AMS1117-5V in fig. 13 is a three-terminal regulator that converts VCC to L9349LF, and its power supply VIN, VOUT (TAB), adj (gnd) are its power input, 5V output, and ground pins, respectively. The VIN pin is connected to the power VCC. Vout (tab) is connected to the VS PIN (PIN5) of L9349LF to power the logic within the chip. The capacitors C1 and C2 are filter capacitors for supplying power to the 5V logic of the chip and are connected between VOUT (TAB) and ADJ (GND) of AMS1117-5V in a bridge mode, and the capacities of the capacitor C1 and the capacitor C2 are 100uf and 0.1uf respectively.
The 4-path output OUT1(5A), OUT2(5A), OUT3(3A) and OUT4(3A) of the L9349LF chip respectively correspond to PIN2, PIN9, PIN12 and PIN19, the resistance R1, the resistance R2, the resistance R5 and the resistance R6 which are directly connected in series with an output Channel are output current sampling resistance values of 0.1 ohm, and Channel (Channel number) current detection + and Channel (Channel number) current detection-led OUT from two ends of the resistance R6326 are connected with an ADC of an external controller 9 to sample output current data and correspond to a measuring range of 100 mv/1A. The PINs corresponding to the control signal inputs corresponding to the 4 outputs, IN1, IN2, IN3, IN4, are PIN17, PIN14, PIN7, PIN4, respectively. The external controller 9 inputs a PWM control signal by being connected to the input pin, and controls the current magnitude of the output channel by controlling and changing the duty ratio of the PWM signal, and the larger the signal duty ratio, the larger the output current. The resistor R3, the resistor R4, the resistor R7 and the resistor R8 are pull-down resistors of the signal input end, the resistance value is 10 kilo-ohms, one end of each pull-down resistor is connected to the control signal input end, the other end of each pull-down resistor is grounded, and the L9349LF chip is prevented from being started mistakenly when no signal input is interfered. The EN terminal (PIN16) is an enable terminal (active high) of the L9349LF chip, and determines whether the chip is activated for use, when the external controller 9 outputs high level, the chip function is activated, the resistor R9 is a pull-down resistor of the EN terminal and is connected between EN and GND, and the resistance value is the same as that of the other four pull-down resistors, so as to ensure that the chip is not turned on by mistake when no signal is input. PIN1, PIN10, PIN11, PIN15, PIN20, and PIN21 are circuit grounds.
TABLE 1 Pin function Table for chip and three-terminal regulator
As shown in fig. 12, the head end of the coil 618 is connected to the power supply VCC, the tail end is connected to the circuit output channel, and a bypass capacitor set composed of 3 10uf capacitors C3, a capacitor C4 and a capacitor C5 is connected in parallel to both ends of the power supply, so as to improve the transient response capability of the brake. The freewheeling diode D1 is connected in reverse parallel across the MR brake coil 618 to prevent the circuit from being damaged due to breakdown of the induced electromotive force when the MR brake is switched from a braking state to a non-braking state.
When the automobile runs normally, the magnetorheological fluid is in a liquid state, the fixing strip 606 is used for preventing the sealing cylinder 7 from rotating, and the rotating disc 602 slightly rotates under the driving of the liquid magnetorheological fluid, so that the force limiting spring 612 is designed, the pulling force of the force limiting spring is larger than the force of the magnetorheological fluid for driving the rotating disc 602 to rotate, the rotating disc 602 is not influenced by the magnetorheological fluid, and the normal running of the automobile is ensured. When the automobile brakes, the sealing barrel 7 is not rotated by the fixing strip 606, and then the rotating disc 602 and the sealing barrel 7 rotate relatively by the mode that the annular bulge 619 is clamped with the second annular groove 8, so that braking is realized.
The invention converts the rotation torque generated when the automobile runs into the brake torque for stopping the automobile, and the method comprises the following steps:
the invention is arranged on a front wheel axle 2 of a new energy automobile, and bearings are arranged at the centers of a left bottom plate 4 and a right bottom plate 4 to ensure the rotary connection with a brake shaft 3. When the vehicle runs normally, the magnetorheological fluid is in a liquid state, the axle 2 rotates, and the force limiting spring 612 pulls the rotating disc 602 to be not driven by the brake shaft 3; when braking, the coil 618 is electrified to generate a magnetic field, so that the magnetorheological fluid is instantly changed from a liquid state to a solid state, the brake shaft 3 is connected with the rotating disc 602, the rotating disc 602 and the brake shaft 3 rotate in the same direction, and therefore the driving wheel on the outer ring of the rotating disc 602 is driven to rotate in the opposite direction, when the driving wheel rotates, braking pressure is generated on the disc pressurizing block 608, all pressurizing modules are integrally reversed, the magnetorheological fluid in the sealed cavity is pressurized, and the solid magnetorheological fluid generates braking torque on the brake shaft 3, so that braking is realized.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "leading," "trailing," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention. It is also to be understood that, unless expressly stated or limited otherwise, the terms "connected" and "coupled" are intended to be open-ended, i.e., may be fixedly connected; can be a detachable connection; or may be a point connection; may be a direct connection; may be indirectly connected through an intermediate medium, may communicate between the two elements, and those skilled in the art will understand the specific meaning of the above terms in the present invention in specific situations. The connection of the devices, which is not described in detail in the present invention, is understood in the conventional manner in the art.
The above-described embodiments are only specific examples for further explaining the object, technical solution and advantageous effects of the present invention in detail, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement and the like made within the scope of the present disclosure are included in the protection scope of the present invention.
Claims (10)
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| CN202011126626.9A CN113446332A (en) | 2021-01-15 | 2021-01-15 | Self-boosting type magnetorheological fluid braking device |
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|---|---|---|---|---|
| EP1070871A2 (en) * | 1999-07-19 | 2001-01-24 | Meritor Heavy Vehicle Systems, LLC | Reduced drag wet disk brake |
| CN203257938U (en) * | 2013-01-25 | 2013-10-30 | 中国矿业大学 | Radial extrusion type magnetorheological fluid brake |
| CN103697089A (en) * | 2013-12-27 | 2014-04-02 | 清华大学 | Self-energizing magnetorheological fluid brake device capable of recycling brake energy |
| EP3278844A1 (en) * | 2016-08-05 | 2018-02-07 | Giant Manufacturing Co., Ltd. | Magneto-rheological fluid rotary resistance device |
| WO2019052072A1 (en) * | 2017-09-14 | 2019-03-21 | 合肥工业大学 | Brake using magnetorheological transmission and brake-by-wire |
| CN214304951U (en) * | 2021-01-15 | 2021-09-28 | 柳州职业技术学院 | Self-boosting type magnetorheological fluid braking device |
-
2021
- 2021-01-15 CN CN202011126626.9A patent/CN113446332A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1070871A2 (en) * | 1999-07-19 | 2001-01-24 | Meritor Heavy Vehicle Systems, LLC | Reduced drag wet disk brake |
| CN203257938U (en) * | 2013-01-25 | 2013-10-30 | 中国矿业大学 | Radial extrusion type magnetorheological fluid brake |
| CN103697089A (en) * | 2013-12-27 | 2014-04-02 | 清华大学 | Self-energizing magnetorheological fluid brake device capable of recycling brake energy |
| EP3278844A1 (en) * | 2016-08-05 | 2018-02-07 | Giant Manufacturing Co., Ltd. | Magneto-rheological fluid rotary resistance device |
| WO2019052072A1 (en) * | 2017-09-14 | 2019-03-21 | 合肥工业大学 | Brake using magnetorheological transmission and brake-by-wire |
| CN214304951U (en) * | 2021-01-15 | 2021-09-28 | 柳州职业技术学院 | Self-boosting type magnetorheological fluid braking device |
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