A dual-motor magnetorheological fluid brake device

Abstract

The present invention discloses a dual-motor magnetorheological fluid brake device, comprising a housing and an axle, wherein the housing is surrounded by front and rear bottom plates and side plates to form a cylindrical working chamber, wherein the axle passes through the front and rear bottom plates and is arranged in the working chamber, wherein the axle is connected to the front and rear bottom plates respectively through bearings, wherein a sealing cylinder is arranged in the working chamber, wherein the inner surfaces of the front and rear bottom plates are provided with two annular protrusions, wherein the left and right ends of the sealing cylinder are respectively clamped in the inner annular protrusions of the front and rear bottom plates, and after being assembled with the front and rear bottom plates, a sealing chamber for containing magnetorheological fluid is formed; wherein a brake disc and two groups of magnetic conductive modules are arranged in the sealing chamber, wherein the magnetic conductive modules are respectively arranged on the bearings of the front and rear bottom plates and rotate coaxially with the axle; wherein the brake disc is arranged on the axle and is located between the two groups of magnetic conductive modules and rotates coaxially with the axle. The present invention utilizes the instantaneous solidification characteristics of the magnetorheological fluid after being magnetized to wrap the brake disc and apply braking force, which will greatly reduce the degree of wear on the workpiece and extend the service life of the product.

Description

Technical Field

[0001] The invention belongs to the field of automobile braking, and in particular relates to a dual-motor magnetorheological fluid braking device. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as a power source (or use conventional vehicle fuels and new vehicle power devices), and integrate advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies, and new structures. Currently, most new energy vehicle brakes are still traditional brakes, that is, dry friction braking through physical clamping, which will cause greater damage to the workpiece.

[0003] Magnetorheological fluid is widely used in aerospace, mechanical processing, construction, medical and other fields due to its fast response (millisecond level), low energy consumption, easy control, good durability, wide operating temperature range and long service life. This characteristic of magnetorheological fluid can be used to conveniently manufacture braking devices, but currently the braking devices manufactured by magnetorheological fluid can only use its shear stress and the braking force it can generate is small, so it cannot meet the braking requirements of large equipment such as new energy vehicles. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a dual-motor magnetorheological fluid brake device with large braking force and adjustability.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is:

[0006] A dual-motor magnetorheological fluid brake device comprises a shell and an axle, wherein the shell is surrounded by front and rear bottom plates and side plates to form a cylindrical working chamber, the axle passes through the front and rear bottom plates and is arranged in the working chamber, the axle is connected to the front and rear bottom plates respectively through bearings, a sealing cylinder is provided in the working chamber, the front and rear ends of the sealing cylinder are embedded in the sealing strip and then pressed onto the bottom plate, forming a sealed chamber for containing magnetorheological fluid with the front and rear bottom plates; a brake disc and two groups of magnetic conductive modules are provided in the sealed chamber, the magnetic conductive modules are respectively arranged on the bearings of the front and rear bottom plates, and rotate coaxially with the axle; the brake disc is arranged on the axle and is located between the two groups of magnetic conductive modules, and rotates coaxially with the axle.

[0007] As a further technical solution, the above-mentioned brake disc includes a brake shaft and a plurality of trapezoidal ring bodies, wherein the brake shaft is wrapped around the axle, and the trapezoidal ring bodies are arranged on the brake shaft in a front-to-back order.

[0008] As a further technical solution, the above-mentioned sealing cylinder includes an upper sealing cylinder and a lower sealing cylinder, both of which are U-shaped structures, and the inner walls of the upper sealing cylinder and the lower sealing cylinder are respectively provided with a plurality of pressure blocks, and the pressure blocks are arranged in sequence front and back in accordance with the intervals of the trapezoidal ring body; L-shaped fixing blocks are respectively provided on the outer sides of the left and right sides of the lower sealing cylinder, and the L-shaped fixing blocks are connected to the left and right sides of the lower sealing cylinder to form lower slots for inserting the left and right sides of the upper sealing cylinder, and upper slots are provided on the inner sides of the left and right sides of the upper sealing cylinder for inserting the left and right sides of the lower sealing cylinder, and the upper slots are provided on the arc block on the inner side of the upper sealing cylinder; a first threaded hole is provided on the L-shaped fixing block; rectangular fixing blocks are respectively provided on the left and right sides of the upper sealing cylinder, and a second threaded hole is provided on the rectangular fixing block, the positions of the first threaded hole and the second threaded hole correspond to each other up and down, the first threaded hole and the second threaded hole are connected by a screw, the top of the screw is connected to the motor, and the motor is fixed on the side plate of the shell.

[0009] As a further technical solution, the upper and lower parts of the screw rod described above are set to have threads in different directions, the first threaded hole is consistent with the thread direction of the upper part of the screw rod, and the second threaded hole is consistent with the thread direction of the lower part of the screw rod.

[0010] As a further technical solution, the front and rear ends of the upper sealing tube and the lower sealing tube mentioned above are provided with U-shaped grooves, and the sealing strip is divided into an upper sealing strip and a lower sealing strip, the upper sealing strip is embedded in the U-shaped groove of the upper sealing tube, and the lower sealing strip is embedded in the U-shaped groove of the lower sealing tube, and a group of guide members are respectively provided between the left and right same-direction edges of the upper sealing strip and the lower sealing strip, and the guide members include upper guide strips and lower guide strips which are parallel to each other, the upper guide strips are respectively connected to the left and right ends of the lower sealing strip, and the lower guide strips are respectively connected to the left and right ends of the upper sealing strip.

[0011] As a further technical solution, when the first threaded hole and the second threaded hole are respectively located at the upper and lower ends of the screw rod, the sealing cavity formed by the upper sealing cylinder and the lower sealing cylinder is elliptical, the lower edge of the upper sealing cylinder is crimped to the outside of the upper edge of the lower sealing cylinder, the upper guide strip is crimped to the lower guide strip, and the pressure block is not inserted into the gap of the trapezoidal ring body.

[0012] As a further technical solution, when the first threaded hole and the second threaded hole move to the middle of the screw rod, the upper sealing cylinder is inserted into the lower slot of the lower sealing cylinder, and the lower sealing cylinder is inserted into the upper slot of the upper sealing cylinder. The width of the slot is greater than the width of the upper guide strip, and the width of the lower slot is greater than the width of the lower guide strip; the sealing cavity formed by the upper sealing cylinder and the lower sealing cylinder is a cylindrical structure, and the pressure block is sequentially embedded in the gap of the trapezoidal ring body front and back.

[0013] As a further technical solution, the above-mentioned magnetic conductive module includes a magnetic conductive cavity, a magnetic isolation ring and a coil. The magnetic conductive cavity is a cylindrical cavity surrounded by a first magnetic conductive ring, a second magnetic conductive ring, a third magnetic conductive ring and a fourth magnetic conductive ring. The first magnetic conductive ring is an inner ring of the cylindrical cavity, the second magnetic conductive ring is arranged on the outer side surface of the first magnetic conductive ring, and the third magnetic conductive ring and the fourth magnetic conductive ring are the left and right bottom surfaces of the cylindrical cavity; the first magnetic conductive ring and the third magnetic conductive ring are installed on the axle, and the magnetic isolation ring is clamped between the fourth magnetic conductive ring and the first magnetic conductive ring.

[0014] As a further technical solution, the braking device also includes a coil current control module, which includes an external controller, a control circuit and an output circuit including a coil, the external controller is electrically connected to the input end of the control circuit, and the output end of the control circuit is electrically connected to the output circuit.

[0015] As a further technical solution, the external controller mentioned above adopts a PLC or a microcontroller.

[0016] As a further technical solution, the control circuit includes a power supply VCC, a three-terminal voltage regulator U2, a capacitor C1, a capacitor C2, a chip, and resistors R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10. The three-terminal voltage regulator U2 adopts AMS1117-5v, the chip adopts L9349LF, and the 3rd pin (i.e., VIN pin) of the three-terminal voltage regulator U2 is connected to the power supply VCC. The 2nd pin of the three-terminal regulator U2 (i.e., the VOUT (TAB) pin) is connected to the VS pin of the chip, and the capacitors C1 and C2 are connected between the 2nd pin (i.e., the VOUT (TAB) pin) and the 1st pin (i.e., the ADJ (GND) pin) of the three-terminal regulator U2; the 4 outputs OUT1, OUT2, OUT3, and OUT4 of the chip correspond to PIN2, PIN9, PIN12, and PIN19 respectively, and the resistors R1, R2, R5, and R7 are directly connected in series with the output channels. R6 is for output current sampling, and the channel current positive feedback and channel current negative feedback drawn from its two ends are connected to the ADC of the external controller to sample the output current data; the control signal inputs corresponding to the 4 outputs are IN1, IN2, IN3, and IN4, and the corresponding pins are PIN17, PIN14, PIN7, and PIN4; the external controller inputs the PWM control signal by connecting to the input pins; resistors R3, R4, R7, and R8 are pull-down resistors at the signal input end, and one end of the pull-down resistor is connected to the control signal input end and the other end is grounded; the EN end, i.e., PIN16, is the enable end of the chip, i.e., high level is valid. When the external controller outputs a high level, the chip function is activated. Resistor R9 is a pull-down resistor at the EN end, which is connected between EN and GND, and its resistance value is the same as that of the four pull-down resistors of resistors R3, R4, R7, and R8; PIN1, PIN10, PIN11, PIN15, PIN20, and PIN21 are circuit grounds.

[0017] As a further technical solution, the above-mentioned output circuit includes capacitor C3, capacitor C4, capacitor C5, freewheeling diode D1 and a coil. The head end of the coil is connected to the power supply VCC, and the tail end is connected to the output channel of the control circuit. The bypass capacitor group composed of capacitor C3, capacitor C4 and capacitor C5 is connected in parallel at both ends of the power supply; the freewheeling diode D1 is connected in reverse parallel at both ends of the coil.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The product of the present invention has a long service life.

[0020] The present invention utilizes the instantaneous solidification characteristic of magnetorheological fluid after being magnetized to wrap the brake disc and apply braking force, which will greatly reduce the degree of wear on the workpiece and extend the service life of the product.

[0021] 2. The product of the present invention has great braking force.

[0022] The present invention sets up two brake structures. One is to set up a brake disc in the sealing cavity. The brake disc is composed of a plurality of trapezoidal annular bodies. The inclined groove formed in the middle after the plurality of trapezoidal annular bodies are arranged can better contact with the magnetorheological fluid and can enhance the braking force after magnetic curing. The other is to use a motor to control the screw rod to pressurize the upper and lower sealing cylinders toward the center. The pressurizing module in the sealing cylinder is embedded in the gap of the trapezoidal annular body after pressurization, and the solidified magnetorheological fluid is squeezed, making it more difficult for the axle to rotate, thereby increasing the braking force and being more suitable for new energy vehicles.

[0023] 3. The present invention is adjustable.

[0024] The present invention adjusts the coil current through an external controller and a control circuit, thereby adjusting the solidification degree of the magnetorheological fluid and adjusting the braking force; and the present invention can also use a motor to control the downward pressing distance of the screw rod, thereby controlling the pressurization degree of the pressurization module.

[0025] 4. The magnetorheological fluid of the present invention is stable during solidification.

[0026] The conventional magnetorheological fluid brake is generally provided with only one electromagnetic coil, and the magnetic strength gradually weakens during the magnetic conduction, resulting in unstable solidification of the magnetorheological fluid. The present invention provides an electromagnetic coil at each of the left and right ends of the magnetorheological fluid, which can strengthen the magnetic field and stabilize the solidification degree of the magnetorheological fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the appearance structure of a dual-motor magnetorheological fluid brake device of the present invention;

[0028] Figure 2 A schematic diagram of the internal structure of a dual-motor magnetorheological fluid brake device of the present invention;

[0029] Figure 3 for Figure 2 Right side view after omitting the bottom plate;

[0030] Figure 4 This is a schematic diagram of the internal structure of a dual-motor magnetorheological fluid brake device of the present invention when not pressurized;

[0031] Figure 5 This is a schematic diagram of the internal structure of a dual-motor magnetorheological fluid brake device of the present invention when pressurized;

[0032] Figure 6 It is a structural schematic diagram of the lower sealing cylinder of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the upper sealing cylinder of the present invention;

[0034] Figure 8 It is a structural schematic diagram of the magnetic conductive module of the present invention;

[0035] Fig. 9 for Figure 8 Exploded view of the magnetic conductivity module;

[0036] Fig.10 This is a control principle diagram of the coil current control module of the present invention;

[0037] Fig.11 is an output circuit diagram of the present invention;

[0038] Fig.12 It is a control circuit diagram of the present invention.

[0039] Figure numerals: 1-housing, 2-axle, 3-bottom plate, 4-side plate, 5-bearing, 6-sealing cylinder, 601-upper sealing cylinder, 602-lower sealing cylinder, 603-L-shaped fixing block, 604-lower slot, 605-upper slot, 606-arc-shaped block, 607-first threaded hole, 608-rectangular fixing block, 609-second threaded hole, 610-pressurizing block, 611-U-shaped groove, 7-sealing strip, 701-upper sealing strip, 702-lower sealing strip, 70 3-upper guide bar, 704-lower guide bar, 8-brake disc, 801-brake shaft, 802-trapezoidal ring body, 9-magnetic conductive module, 901-first magnetic conductive ring, 902-second magnetic conductive ring, 903-third magnetic conductive ring, 904-fourth magnetic conductive ring, 905-magnetic isolation ring, 906-coil, 10-screw, 11-motor, 12-external controller, 13-control circuit; a-front, b-back, c-left, d-right, e-top, f-bottom. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with examples, but the implementation mode of the present invention is not limited to the scope represented by the examples.

[0041] Embodiment 1:

[0042] like Figure 1-7As shown, a dual-motor 11 magnetorheological fluid brake device includes a housing 1 and an axle 2. The housing 1 is surrounded by a front and rear bottom plate 3 and a side plate 4 to form a cylindrical working chamber. The axle 2 passes through the front and rear bottom plates 3 and is arranged in the working chamber. The axle 2 is connected to the front and rear bottom plates 3 through bearings 5. A sealing cylinder 6 is provided in the working chamber. The front and rear ends of the sealing cylinder 6 are embedded in the sealing strip 7 and then crimped on the bottom plate 3 to form a sealed chamber containing magnetorheological fluid with the front and rear bottom plates 3. A brake disc 8 and two sets of magnetic conductive modules are provided in the sealed chamber. The magnetic conductive modules are respectively provided on the bearings 5 ​​of the front and rear bottom plates 3 and rotate coaxially with the axle 2. The brake disc 8 is provided on the axle 2 and is located between the two sets of magnetic conductive modules and rotates coaxially with the axle 2. The brake disc 8 includes a brake shaft 801 and a plurality of trapezoidal annular bodies 802. The brake shaft 801 is wrapped on the axle 2. The trapezoidal annular bodies 802 are arranged on the brake shaft 801 in sequence at intervals. The sealing cylinder 6 includes an upper sealing cylinder 601 and a lower sealing cylinder 602, both of which are U-shaped structures. A plurality of pressure blocks 610 are provided on the inner walls of the upper sealing cylinder 601 and the lower sealing cylinder 602, respectively. The pressure blocks 610 are arranged in sequence in front and back in accordance with the intervals of the trapezoidal annular body 802; L-shaped fixing blocks 603 are provided on the outer sides of the left and right sides of the lower sealing cylinder 602, respectively, and the L-shaped fixing blocks 603 are connected to the left and right sides of the lower sealing cylinder 602 to form lower slots 604 for inserting into the left and right sides of the upper sealing cylinder 601; the inner sides of the left and right sides of the upper sealing cylinder 601 are provided with Insert the upper slots 605 on the left and right sides of the lower sealing cylinder 602, and the upper slots 605 are arranged on the arc block 606 on the inner side of the upper sealing cylinder 601; the L-shaped fixing block 603 is provided with a first threaded hole 607; the upper sealing cylinder 601 is provided with rectangular fixing blocks 608 on the left and right sides, and the rectangular fixing blocks 608 are provided with a second threaded hole 609, the positions of the first threaded hole 607 and the second threaded hole 609 correspond to each other, and the first threaded hole 607 and the second threaded hole 609 are connected by a screw rod 10, the top of the screw rod 10 is connected to the motor 11, and the motor 11 is fixed on the side plate 4 of the housing 1. The upper half of the screw rod 10 is set as a left-handed thread, and the lower half is set as a right-handed thread. The first threaded hole 607 is consistent with the thread direction of the upper half of the screw rod 10, and the second threaded hole 609 is consistent with the thread direction of the lower half of the screw rod 10. A U-shaped groove 611 is provided at the front and rear ends of the upper sealing cylinder 601 and the lower sealing cylinder 602. The sealing strip 7 is divided into an upper sealing strip 701 and a lower sealing strip 702. The upper sealing strip 701 is embedded in the U-shaped groove 611 of the upper sealing cylinder 601, and the lower sealing strip 702 is embedded in the U-shaped groove 611 of the lower sealing cylinder 602. A group of guide members are respectively provided between the left and right same-direction edges of the upper sealing strip 701 and the lower sealing strip 702. The guide members include an upper guide strip 703 and a lower guide strip 704 which are parallel to each other. The upper guide strip 703 is respectively connected to the left and right ends of the lower sealing strip 702, and the lower guide strip 704 is respectively connected to the left and right ends of the upper sealing strip 701.When the first threaded hole 607 and the second threaded hole 609 are respectively located at the upper and lower ends of the screw rod 10, the sealing cavity formed by the upper sealing cylinder 601 and the lower sealing cylinder 602 is elliptical, and the lower edge of the upper sealing cylinder 601 is crimped onto the outer side of the upper edge of the lower sealing cylinder 602, and the upper guide strip 703 is crimped onto the lower guide strip 704, thereby realizing the sealing of the edge magnetorheological fluid, and the pressure block 610 is not inserted into the gap of the trapezoidal ring body 802. When the first threaded hole 607 and the second threaded hole 609 move to the middle of the screw rod 10, the upper sealing cylinder 601 is inserted into the lower slot 604 of the lower sealing cylinder 602, and the lower sealing cylinder 602 is inserted into the upper slot 605 of the upper sealing cylinder 601. The width of the slot is greater than the width of the upper guide strip 703, and the width of the lower slot 604 is greater than the width of the lower guide strip 704, which is convenient for inserting the upper guide strip 703 and the lower guide strip 704. Of course, the upper guide strip 703 and the lower guide strip 704 are also made of elastic material like the sealing strip 7, so they can accept certain deformation when inserted into the slot; the sealing cavity formed by the upper sealing cylinder 601 and the lower sealing cylinder 602 is a cylindrical structure, and the pressure block 610 is sequentially embedded in the gap of the trapezoidal ring body 802 front and back.

[0043] like Figure 8-9 As shown, the magnetic conductive module 9 includes a magnetic conductive cavity, a magnetic isolation ring 905 and a coil 906. The magnetic conductive cavity is a cylindrical cavity surrounded by a first magnetic conductive ring 901, a second magnetic conductive ring 902, a third magnetic conductive ring 903 and a fourth magnetic conductive ring 904. The first magnetic conductive ring 901 is an inner ring of the cylindrical cavity, the second magnetic conductive ring 902 is arranged on the outer side surface of the first magnetic conductive ring 901, and the third magnetic conductive ring 903 and the fourth magnetic conductive ring 904 are the left and right bottom surfaces of the cylindrical cavity; the first magnetic conductive ring 901 and the third magnetic conductive ring 903 are installed on the axle 22, and the magnetic isolation ring 905 is clamped between the fourth magnetic conductive ring 904 and the first magnetic conductive ring 901.

[0044] Embodiment 2:

[0045] like Fig.10 As shown, based on Example 1, the circuit of the present invention includes a coil current control module, the coil current control module includes an external controller 12, a control circuit 13 and an output circuit including a coil, the external controller 12 is electrically connected to the input end of the control circuit 13, and the output end of the control circuit 13 is electrically connected to the output circuit.

[0046] The external controller 12 can be controlled by various PLCs, microcontrollers or other controllers. The present invention takes the mature Arduino development board as the controller control channel 1 for output as an example; the development board digital signal output port 9 is used as the output port of the PWM control signal, and it is connected to the signal input port 1 ( Fig.12 Connect the digital signal port 10 of the development board to the enable terminal of the control circuit 13 ( Fig.12 The analog signal port A0 of the Arduino development board is connected to the current sampling output port of the control circuit 13, and the voltage across the sampling resistor is read through the internal ADC to obtain the current information.

[0047] like Fig.12 As shown, since the maximum current required for the magnetorheological brake to work is 3A, the control circuit 1321 uses the power control chip L9349LF of STMicroelectronics as the core device, and its maximum load current is 5A, which can fully meet the control requirements of the magnetorheological brake. The working voltage of the chip is 4.5~32V, and it has 4 independently controllable output channels. By controlling the duty cycle of the input PWM signal, the load current can be easily controlled to control the brake for braking.

[0048] Fig.12 U2 in the figure is a three-terminal voltage regulator, which is used to convert the power supply VCC into 5V to power the logic circuit of the chip. VIN, VOUT (TAB), and ADJ (GND) are its power input, 5V output, and ground pins respectively. Among them, pin 3 (i.e., VIN pin) is connected to the power supply VCC. VOUT (TAB) is connected to the VS pin (PIN5) of the chip to power the logic circuit in the chip. Capacitors C1 and C2 are filter capacitors for the chip's 5V logic power supply, which are connected across VOUT (TAB) and ADJ (GND) of the three-terminal voltage regulator U2. The capacities of capacitors C1 and C2 are 100uf and 0.1uf respectively.

[0049] The chip's 4 outputs OUT1 (5A), OUT2 (5A), OUT3 (3A), and OUT4 (3A) correspond to PIN2, PIN9, PIN12, and PIN19, respectively. The resistors R1, R2, R5, and R6 are directly connected in series with the output channels as output current sampling resistors with a resistance of 0.1 ohms. The positive feedback of the current of the channel (channel number) and the negative feedback of the current of the channel (channel number) drawn from both ends are connected to the ADC of the external controller 1220 to sample the output current data, corresponding to a range of 100mv / 1A. The control signal inputs corresponding to the 4 outputs are IN1, IN2, IN3, and IN4, and the corresponding pins are PIN17, PIN14, PIN7, and PIN4. The external controller 1220 inputs the PWM control signal by connecting to the input pins, and controls the current of the output channel by changing the duty cycle of the PWM signal. The larger the signal duty cycle, the larger the output current. Resistors R3, R4, R7 and R8 are pull-down resistors at the signal input end, with a resistance of 10 kilo-ohms. One end of the pull-down resistor is connected to the control signal input end and the other end is grounded. The function is to prevent the chip from being turned on by mistake when there is no signal input and encountering interference. The EN end (PIN16) is the enable end of the chip (high level is valid), which determines whether the chip is activated. When the external controller 1220 outputs a high level, the chip function is activated. Resistor R9 is a pull-down resistor at the EN end, which is connected between EN and GND. The resistance is the same as the other four pull-down resistors, which is used to ensure that the chip will not be turned on by mistake when there is no signal input. PIN1, PIN10, PIN11, PIN15, PIN20 and PIN21 are circuit grounds.

[0050] Table 1 is the pin function table of the chip and the three-terminal regulator U2

[0051]

[0052] like Fig.11 As shown, the head end of the coil 906 is connected to the power supply VCC, and the tail end is connected to the circuit output channel. In the figure, a bypass capacitor group consisting of three 10uf capacitors C3, C4 and C5 is connected in parallel at both ends of the power supply to improve the transient response capability of the brake. The freewheeling diode D1 is reversely connected in parallel at both ends of the magnetorheological brake coil 906 to prevent the induced electromotive force from breaking through the circuit when switching quickly from the braking state to the non-braking state, causing circuit damage and improving safety and stability.

[0053] When the car is running normally, the motor 11 and the coil are not energized, the magnetorheological fluid is in liquid state, and the entire brake device rotates with the axle 2. At this time, the first threaded hole 607 and the second threaded hole 609 are located at the upper and lower ends of the screw rod 10. The sealing cavity formed by the upper sealing cylinder 601 and the lower sealing cylinder 602 is elliptical, and the lower edge of the upper sealing cylinder 601 is crimped to the outer side of the upper edge of the lower sealing cylinder 602, and the upper guide bar 703 is crimped to the lower guide bar 704. The pressure block 610 is not inserted into the gap of the trapezoidal ring body 802, and cooperates with the front and rear bottom plates 3 to achieve a sealed state; when the car brakes, the coil is energized to make the magnetorheological fluid instantly become a solid state. After solidification, the magnetorheological fluid generates a braking force to prevent the brake disc 8 from rotating. The brake disc 8 is wrapped around the axle 2, thereby preventing the axle 2 from rotating, thereby achieving braking. At the same time, the motor 11 can also be started, and the motor 11 drives the screw rod 10 to rotate. Due to the upper and lower different direction thread design of the screw rod 10, the upper sealing cylinder 601 and the lower sealing cylinder 602 are retracted inward at the same time, the upper sealing cylinder 601 is inserted into the lower slot 604 of the lower sealing cylinder 602, and the lower sealing cylinder 602 is inserted into the upper slot 605 of the upper sealing cylinder 601, and the pressure block 610 is embedded in the gap of the trapezoidal ring body 802 to squeeze the solidified magnetorheological fluid, thereby increasing its resistance to the brake disc 8, thereby increasing the braking force.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "head", "tail", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. It should also be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection; it can be a detachable connection; it can also be a point connection; it can be a direct connection; it can be an indirect connection through an intermediate medium, so that the internals of the two elements can be connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The device connection methods not fully described in the present invention are all understood as conventional connection methods in the field.

[0055] The above embodiments are only specific examples for further describing the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope disclosed by the present invention are included in the protection scope of the present invention.

Claims

1. A dual-motor magnetorheological fluid brake device, comprising a housing and an axle, wherein the housing is surrounded by front and rear bottom plates and side plates to form a cylindrical working chamber, the axle passes through the front and rear bottom plates and is arranged in the working chamber, and the axle is connected to the front and rear bottom plates respectively through bearings, characterized in that: A sealing cylinder is provided in the working chamber, and the front and rear ends of the sealing cylinder are embedded in the sealing strip and then pressed on the bottom plate, forming a sealing chamber for containing magnetorheological fluid with the front and rear bottom plates; a brake disc and two sets of magnetic conductive modules are provided in the sealing chamber, and the magnetic conductive modules are respectively provided on the bearings of the front and rear bottom plates and rotate coaxially with the axle; the brake disc is provided on the axle and located between the two sets of magnetic conductive modules and rotates coaxially with the axle; The brake disc comprises a brake shaft and a plurality of trapezoidal annular bodies, wherein the brake shaft is wrapped around the axle, and the trapezoidal annular bodies are sequentially arranged on the brake shaft at intervals in front and back; The sealing cylinder comprises an upper sealing cylinder and a lower sealing cylinder, both of which are U-shaped structures, and the inner walls of the upper sealing cylinder and the lower sealing cylinder are respectively provided with a plurality of pressure blocks, and the pressure blocks are aligned with the intervals of the trapezoidal annular body and are arranged in sequence front and back; the left and right outer sides of the lower sealing cylinder are respectively provided with L-shaped fixing blocks, and the L-shaped fixing blocks are connected with the left and right sides of the lower sealing cylinder to form lower slots for inserting the left and right sides of the upper sealing cylinder, and the left and right inner sides of the upper sealing cylinder are provided with upper slots for inserting the left and right sides of the lower sealing cylinder, and the upper slots are arranged on the arc block on the inner side of the upper sealing cylinder; the L-shaped fixing block is provided with a first threaded hole; the left and right sides of the upper sealing cylinder are respectively provided with rectangular fixing blocks, and the rectangular fixing block is provided with a second threaded hole, the positions of the first threaded hole and the second threaded hole correspond to each other up and down, the first threaded hole and the second threaded hole are connected by a screw, the top of the screw is connected to the motor, and the motor is fixed to the side plate of the shell; The upper and lower parts of the screw rod are set to have threads in different directions, the first threaded hole is consistent with the thread direction of the upper part of the screw rod, and the second threaded hole is consistent with the thread direction of the lower part of the screw rod; When the first threaded hole and the second threaded hole move to the middle of the screw rod, the upper sealing cylinder is inserted into the lower slot of the lower sealing cylinder, and the lower sealing cylinder is inserted into the upper slot of the upper sealing cylinder. The width of the slot is greater than the width of the upper guide strip, and the width of the lower slot is greater than the width of the lower guide strip. The sealing cavity formed by the upper sealing cylinder and the lower sealing cylinder is a cylindrical structure, and the pressure block is sequentially embedded in the gap of the trapezoidal ring body front and back.

2. A dual-motor magnetorheological fluid brake device according to claim 1, characterized in that: The front and rear ends of the upper sealing cylinder and the lower sealing cylinder are provided with U-shaped grooves, and the sealing strip is divided into an upper sealing strip and a lower sealing strip. The upper sealing strip is embedded in the U-shaped groove of the upper sealing cylinder, and the lower sealing strip is embedded in the U-shaped groove of the lower sealing cylinder. A group of guide members are respectively provided between the left and right same-direction edges of the upper sealing strip and the lower sealing strip, and the guide members include upper guide strips and lower guide strips which are parallel to each other. The upper guide strip is respectively connected to the left and right ends of the lower sealing strip, and the lower guide strip is respectively connected to the left and right ends of the upper sealing strip.

3. A dual-motor magnetorheological fluid brake device according to claim 2, characterized in that: When the first threaded hole and the second threaded hole are respectively located at the upper and lower ends of the screw rod, the sealing cavity formed by the upper sealing cylinder and the lower sealing cylinder is elliptical, the lower edge of the upper sealing cylinder is crimped to the outer side of the upper edge of the lower sealing cylinder, the upper guide strip is crimped to the lower guide strip, and the pressure block is not inserted into the gap of the trapezoidal ring body.

4. A dual-motor magnetorheological fluid brake device according to claim 1, characterized in that: The magnetic conductive module includes a magnetic conductive cavity, a magnetic isolation ring and a coil. The magnetic conductive cavity is a cylindrical cavity surrounded by a first magnetic conductive ring, a second magnetic conductive ring, a third magnetic conductive ring and a fourth magnetic conductive ring. The first magnetic conductive ring is an inner ring of the cylindrical cavity, the second magnetic conductive ring is arranged on the outer side surface of the first magnetic conductive ring, and the third magnetic conductive ring and the fourth magnetic conductive ring are the left and right bottom surfaces of the cylindrical cavity; the first magnetic conductive ring and the third magnetic conductive ring are installed on the axle, and the magnetic isolation ring is clamped between the fourth magnetic conductive ring and the first magnetic conductive ring.

5. A dual-motor magnetorheological fluid brake device according to claim 4, characterized in that: It includes a coil current control module, which includes an external controller, a control circuit and an output circuit containing a coil. The external controller is electrically connected to the input end of the control circuit, and the output end of the control circuit is electrically connected to the output circuit. The external controller adopts a PLC or a microcontroller.

6. A dual-motor magnetorheological fluid brake device according to claim 5, characterized in that: The control circuit includes a power supply VCC, a three-terminal voltage regulator U2, a capacitor C1, a capacitor C2, a chip, and resistors R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10. The three-terminal voltage regulator U2 adopts AMS1117-5v, and the chip adopts L9349LF. Pin 3 of the three-terminal voltage regulator U2 is connected to the power supply VCC, and pin 2 of the three-terminal voltage regulator U2 is connected to the VS pin of the chip. The capacitor C1 and the capacitor C2 are connected between pin 2 and pin 1 of the three-terminal voltage regulator U2; the 4 outputs OUT1, OUT2, OUT3, and OUT4 of the chip correspond to PIN2, PIN9, PIN12, and PIN19 respectively, and the resistors R1, R2, R5, and R6 are directly connected in series with the output channel for output current sampling, and the channel current positive feedback and channel current negative feedback drawn from both ends are connected to the ADC of the external controller to sample the output current data; The control signal inputs corresponding to the 4 outputs are IN1, IN2, IN3, and IN4, and the corresponding pins are PIN17, PIN14, PIN7, and PIN4; the external controller inputs the PWM control signal by connecting to the input pins; resistors R3, R4, R7, and R8 are pull-down resistors at the signal input end, and one end of the pull-down resistor is connected to the control signal input end and the other end is grounded; the EN end, i.e. PIN16, is the enable end of the chip, i.e., high level is valid. When the external controller outputs a high level, the chip function is activated, and resistor R9 is the pull-down resistor at the EN end. , connected between EN and GND, and having the same resistance value as the four pull-down resistors R3, R4, R7 and R8; PIN1, PIN10, PIN11, PIN15, PIN20 and PIN21 are circuit groundings; the output circuit comprises capacitor C3, capacitor C4, capacitor C5, freewheeling diode D1 and a coil, the head end of the coil is connected to the power supply VCC, and the tail end is connected to the output channel of the control circuit, a bypass capacitor group composed of capacitor C3, capacitor C4 and capacitor C5 is connected in parallel at both ends of the power supply; the freewheeling diode D1 is connected in reverse parallel at both ends of the coil.

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