CN112727951B - Brake with auxiliary braking function - Google Patents
Brake with auxiliary braking function Download PDFInfo
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- CN112727951B CN112727951B CN202110129695.3A CN202110129695A CN112727951B CN 112727951 B CN112727951 B CN 112727951B CN 202110129695 A CN202110129695 A CN 202110129695A CN 112727951 B CN112727951 B CN 112727951B
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- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
- F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
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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
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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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
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
-
- 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
- F16D2121/20—Electric or magnetic using electromagnets
-
- 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
- F16D2123/00—Multiple operation forces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to a brake with an auxiliary braking function, which comprises a brake disc, a left friction plate, a right friction plate, a caliper assembly, a brake piston, a fixed bracket, an electromagnetic coil group, an electromagnetic sucker component, a magnetorheological fluid brake, a brake pump shell, a first spring, an oil storage chamber, a first piston, a limiting check ring, a second spring, a second piston, a brake pedal, an angle sensor, a three-position three-way electromagnetic valve, an energy accumulator, a wheel speed sensor and a controller, wherein the brake disc is arranged on the brake disc; the angle sensor, the wheel speed sensor, the electromagnetic coil group, the electromagnetic sucker assembly and the three-position three-way electromagnetic valve are all electrically connected with the controller; the magnetorheological fluid brake is adopted as the auxiliary brake of the conventional hydraulic brake, so that the brake response speed can be improved, and the friction element loss is reduced; the hydraulic brake and the magnetic fluid regulation brake are combined, so that the multi-stage brake can be simply and efficiently realized, and the method has important significance for the brake research of the disc brake.
Description
Technical Field
The invention relates to the field of automobile brakes, in particular to a brake with an auxiliary braking function.
Background
The vehicle brake is one of important safety components of the vehicle, and the driving safety is directly influenced by the performance of the vehicle brake. At present, a hydraulic brake is mainly adopted for a vehicle, and the working principle of the hydraulic brake is that brake hydraulic oil pushes friction plates to press a brake disc to generate braking force. In order to effectively guarantee the braking efficiency of the vehicle, an ABS control system is additionally arranged on the vehicle, so that the locking phenomenon of wheels is prevented.
Because the existing brake utilizes the friction principle to brake, the friction plate can be abraded, and the abraded micro particles can not only pollute the environment, but also cause resource waste. When the vehicle is continuously braked for a long time, particularly continuously descends a long slope, high temperature generated by friction heat generation can cause brake failure, and the driving safety is influenced.
The magnetic fluid is a colloid dispersion system consisting of base-carried liquid and granular magnetic solid. The base carrier liquid, i.e., the dispersion medium, is generally kerosene, machine oil, etc., and the solid magnetic particles as the dispersed phase are generally ferromagnetic substances such as iron, cobalt, nickel, and their magnetic oxides, etc. Ferrofluids have colloidal and compositional stability, as well as good magnetization properties. When the external magnetic field is not applied, the smaller the viscosity of the rheological fluid is, the better the magnetorheological effect of the rheological fluid is. When the rheological fluid is subjected to the action of an external magnetic field, the rheological fluid is instantaneously converted into Bingham fluid from Newton fluid. The magnetic particles are acted by magnetic moments, the rotating speed of the particles is changed, friction is generated between the magnetic particles and base liquid, the viscosity of the magnetorheological fluid is influenced, the apparent viscosity of the magnetorheological fluid is obviously increased, and the apparent viscosity of the magnetorheological fluid is increased along with the increase of a magnetic field. In the process, the viscosity of the magnetorheological fluid keeps continuously changing, the whole conversion process is rapid and controllable, and the energy consumption is low.
Disclosure of Invention
The invention provides a brake with an auxiliary braking function, which adopts a magnetorheological fluid brake as the auxiliary brake of the conventional hydraulic brake to reduce the loss of a friction element; the hydraulic brake and the magnetic fluid regulation brake are combined, a multi-stage brake mode can be simply and efficiently realized, and the method has important significance for the brake research of the disc brake.
The invention is realized by the following technical measures:
a brake with an auxiliary braking function comprises a brake disc, a left friction plate, a right friction plate, a caliper assembly, a brake piston, a fixed support, an electromagnetic coil group, an electromagnetic sucker component, a magnetorheological fluid brake, a brake pump shell, a first spring, an oil storage chamber, a first piston, a limiting retainer ring, a second spring, a second piston, a brake pedal, an angle sensor, a three-position three-way electromagnetic valve, an energy accumulator, a wheel speed sensor and a controller;
the brake disc is connected with the axle bolt, the left friction plate and the right friction plate are respectively arranged on the left side and the right side of the brake disc, and the left friction plate and the right friction plate are respectively arranged in an adaptive groove on the caliper assembly through back steel sheets on the left friction plate and the right friction plate so as to carry out rotation limiting; the caliper assembly is fixedly arranged on the vehicle body;
the caliper assembly comprises a caliper body, a brake cylinder and an oil inlet nozzle; the left end of the brake cylinder is fixedly arranged on the right side wall of the caliper body, and holes matched with the diameter of the brake piston are formed in the brake cylinder and the right side wall of the caliper body; the oil inlet nozzle is arranged at the tail part of the brake cylinder;
the brake piston is installed in holes in the right side walls of the brake cylinder and the caliper body in a matching mode, and the left end of the brake piston is in contact with the back steel sheet surface on the right friction plate; sealing rings are arranged in the opening ring grooves of the brake piston and the brake cylinder which are opposite to each other and are used for sealing brake fluid and resetting the brake piston when braking is finished;
the magnetorheological fluid brake is fixed on the left side of the annular support on the fixed bracket through a bolt; the electromagnetic sucker assembly and the magnetorheological fluid brake are sleeved on the end cap of the brake disc;
the electromagnetic chuck assembly comprises an electromagnetic chuck and a chuck shaft sleeve; the electromagnet is arranged on the electromagnetic chuck; the electromagnetic chuck is fixedly connected with the chuck shaft sleeve; the distance between the electromagnetic chuck and the disc surface of the brake disc is 0.2-1 mm; the sucking disc shaft sleeve is arranged on the end cap of the brake disc through a bearing sleeve, and a spline is processed on the outer side of the sucking disc shaft sleeve;
the magnetorheological fluid brake comprises a fixed shell, a rotor, a blade and magnetorheological fluid; a spline and a retaining shoulder are processed in an axial hole of the rotor; the rotor is in splined connection with the sucker shaft sleeve; the retaining shoulder on the rotor is limited by the retaining ring on the end cap of the brake disc in the axial movement; at least 2 blades are arranged on the rotor; the rotor is connected with the fixed shell through a sealing ring, and magnetorheological fluid is filled in the fixed shell;
the brake pump shell is fixedly arranged on the vehicle body; the limiting retainer ring is fixedly arranged on the inner wall of the brake pump shell and divides the brake pump shell into a left cavity and a right cavity; the first spring and the first piston are installed in the left cavity, the left end of the first spring is in contact with the left end face of the left cavity of the brake pump shell, the right end of the first spring is in contact with the first piston, and the first spring is used for resetting the first piston; the second spring and the second piston are arranged in the right chamber, the left end of the second spring is in contact with the limiting retainer ring, the right end of the second spring is in contact with the second piston, and the second spring is used for resetting the second piston; the push rod of the first piston penetrates through the central hole of the limiting retainer ring to penetrate into the right chamber, and a certain gap is reserved between the push rod of the first piston and the second piston; a push rod of the second piston is hinged with the brake pedal; an angle sensor is arranged at the hinged position of the brake pedal and the vehicle body; the oil storage chamber is connected with an oil inlet pipeline on the left cavity of the brake pump shell; an oil outlet on the left chamber of the brake pump shell is connected with a pipeline of a P1 port on the three-position three-way electromagnetic valve; the oil storage chamber is connected with a pipeline of a port P2 on the three-position three-way electromagnetic valve; a port P3 on the three-position three-way electromagnetic valve is connected with an oil inlet nozzle pipeline on the caliper assembly; the P1 port and P3 of the three-position three-way electromagnetic valve are in a normal open state, and the P2 port and P3 are in a disconnected state;
the angle sensor, the wheel speed sensor, the electromagnetic coil group, the electromagnetic sucker assembly and the three-position three-way electromagnetic valve are all electrically connected with the controller; the wheel speed sensor is fixedly arranged on a wheel; the controller collects signals of the angle sensor and the wheel speed sensor in real time and controls the electromagnetic coil group, the electromagnetic chuck assembly and the three-position three-way electromagnetic valve according to a control strategy;
when the vehicle brakes, a driver steps on a brake pedal, the brake pedal pushes the second piston to move left, and the second spring is extruded and deformed by the second piston to generate pedal simulation force; the controller collects signals of the angle sensor in real time to judge the operation of a driver, collects signals of the wheel speed sensor in real time to judge the braking condition of the wheel, and sets a control strategy, the controller controls the magnitude of current in the electromagnetic coil group to control the strength of a magnetic field, so as to control the aggregation state of magnetorheological fluid, the controller controls the magnitude of current of the electromagnetic sucker component to change the adsorption force, so as to change the magnitude of transmission torque and the rotating speed, so as to control the rotating speed of a rotor of the magnetorheological fluid brake, and further change the magnitude of braking force generated by the shearing force of the magnetorheological fluid;
if the driver continues to step on the brake pedal, the second piston pushes the first piston to move left, the first piston enables brake fluid to enter an oil inlet nozzle on the caliper assembly through an oil outlet of a brake pump shell through a port P1 and a port P3 of the three-position three-way electromagnetic valve, the brake fluid pushes the brake piston to move left, and the brake piston pushes the left friction plate and the right friction plate to press the brake disc to generate braking force;
if the controller judges that the wheel is in a locking state according to the wheel speed sensor signal acquired in real time, the controller controls different working states of the three-position three-way electromagnetic valve according to a control strategy to adjust the brake fluid pressure in the brake cylinder, and when a P1 port and a P3 port of the three-position three-way electromagnetic valve are communicated, brake pressurization is carried out; when the P1 port, the P2 port and the P3 port of the three-position three-way electromagnetic valve are all in a disconnected state, braking and pressure maintaining are carried out; when a P2 port and a P3 port of the three-position three-way electromagnetic valve are communicated, braking pressure reduction is carried out; the brake fluid pressure is in a pressurization state, a pressure maintaining state and a pressure reducing state through different working states of the three-position three-way electromagnetic valve.
The invention has the beneficial effects that:
a kind of brake with auxiliary brake function, adopt the magneto-rheological fluid brake as the auxiliary brake of the conventional hydraulic braking, not merely can improve the brake response speed, and reduce the friction element loss; the hydraulic brake and the magnetic fluid regulation brake are combined, a multi-stage brake mode can be simply and efficiently realized, and the method has important significance for the brake research of the disc brake.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a front view of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a partial structural schematic diagram of the present invention.
FIG. 4 is a schematic view of a caliper assembly according to the present invention.
FIG. 5 is a schematic structural diagram of an electromagnetic chuck assembly according to the present invention.
Fig. 6 is a schematic view of the brake disc structure of the present invention.
Fig. 7 is a partial structural schematic diagram of the present invention.
Fig. 8 is a schematic structural view of a magnetorheological fluid brake housing of the present invention.
Fig. 9 is a schematic view of the brake piston structure of the present invention.
Fig. 10 is a schematic view of a partial structure of a magnetorheological fluid brake according to the present invention.
Fig. 11 is a schematic diagram of the hydraulic control principle of the present invention.
Fig. 12 is a schematic diagram of the control system of the present invention.
In the figure, 1-brake disc, 2-left friction disc, 3-right friction disc, 4-caliper assembly, 401-caliper body, 402-brake cylinder, 403-oil inlet nozzle, 5-brake piston, 6-fixed bracket, 7-electromagnetic coil group, 8-electromagnetic suction disc assembly, 801-electromagnetic suction disc, 802-suction disc shaft sleeve, 9-magnetorheological fluid brake, 901-fixed shell, 902-rotor, 903-blade, 10-brake pump shell, 11-first spring, 12-oil storage chamber, 13-first piston, 14-limit retainer ring, 15-second spring, 16-second piston, 17-brake pedal, 18-angle sensor, 19-three-position three-way electromagnetic valve, 20-accumulator, 21-wheel speed sensor, 22-a controller.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by a specific embodiment in combination with the accompanying drawings.
A brake with an auxiliary braking function is shown in figures 1, 2 and 3 and comprises a brake disc 1, a left friction plate 2, a right friction plate 3, a caliper assembly 4, a brake piston 5, a fixed support 6, an electromagnetic coil group 7, an electromagnetic suction disc assembly 8, a magnetorheological fluid brake 9, a brake pump shell 10, a first spring 11, an oil storage chamber 12, a first piston 13, a limit retainer ring 14, a second spring 15, a second piston 16, a brake pedal 17, an angle sensor 18, a three-position three-way electromagnetic valve 19, an energy accumulator 20, a wheel speed sensor 21 and a controller 22;
the brake disc 1 is connected with an axle bolt, the left friction plate 2 and the right friction plate 3 are respectively arranged at the left side and the right side of the brake disc 1, and the left friction plate 2 and the right friction plate 3 are respectively arranged in an adaptive groove on the caliper assembly 4 through back steel sheets on the left friction plate and the right friction plate for rotation limiting; the caliper assembly 4 is fixedly arranged on a vehicle body;
the caliper assembly 4 comprises a caliper body 401, a brake cylinder 402 and an oil inlet nozzle 403; the left end of the brake cylinder 402 is fixedly arranged on the right side wall of the caliper body 401, and holes matched with the diameter of the brake piston 5 are formed in the right side walls of the brake cylinder 402 and the caliper body 401; the oil inlet nozzle 403 is arranged at the tail of the brake cylinder 402;
the brake piston 5 is fittingly installed in holes in the right side walls of the brake cylinder 402 and the caliper body 401, and the left end of the brake piston 5 is in contact with the back steel sheet surface on the right friction plate 3; a sealing ring is arranged in an opening ring groove of the brake piston 5 opposite to the brake cylinder 402 and used for sealing brake fluid and resetting the brake piston 5 when braking is finished;
the fixed support 6 is fixedly arranged on the caliper body 401, the electromagnetic coil group 7 is fixedly arranged on the right side of the annular support on the fixed support 6, and the magnetorheological fluid brake 9 is fixed on the left side of the annular support on the fixed support 6 through a bolt; the electromagnetic sucker assembly 8 and the magnetorheological fluid brake 9 are sleeved on the end cap of the brake disc 1;
the electromagnetic chuck assembly 8 comprises an electromagnetic chuck 801 and a chuck shaft sleeve 802; an electromagnet is arranged on the electromagnetic chuck 801; the electromagnetic chuck 801 is fixedly connected with a chuck shaft sleeve 802; the distance between the electromagnetic chuck 801 and the disc surface of the brake disc 1 is 0.2-1 mm; the sucking disc shaft sleeve 802 is arranged on the end cap of the brake disc 1 through a bearing sleeve, and a spline is processed on the outer side of the sucking disc shaft sleeve 802;
the magnetorheological fluid brake 9 comprises a fixed shell 901, a rotor 902, blades 903 and magnetorheological fluid; a spline and a retaining shoulder are machined in an axial hole of the rotor 902; the rotor 902 is in splined connection with the suction cup shaft sleeve 802; the retaining shoulder on the rotor 902 is limited by the retaining ring on the end cap of the brake disc 1 in the axial movement; at least 2 blades 903 are arranged on the rotor 902; the rotor 902 is connected with the fixed shell 901 through a sealing ring, and magnetorheological fluid is filled in the fixed shell 901;
the brake pump shell 10 is fixedly arranged on a vehicle body; the limit retainer ring 14 is fixedly arranged on the inner wall of the brake pump shell 10 and divides the brake pump shell 10 into a left cavity and a right cavity; the first spring 11 and the first piston 13 are installed in the left chamber, the left end of the first spring 11 is in contact with the left end face of the left chamber of the brake pump shell 10, the right end of the first spring 11 is in contact with the first piston 13, and the first spring 11 is used for resetting the first piston 13; the second spring 15 and the second piston 16 are installed in the right chamber, the left end of the second spring 15 is in contact with the limiting retainer ring 14, the right end of the second spring 15 is in contact with the second piston 16, and the second spring 15 is used for resetting the second piston 16; the push rod of the first piston 13 penetrates through the central hole of the limit retainer ring 14 to penetrate into the right chamber, and a certain gap is reserved between the push rod and the second piston 16; the push rod of the second piston 16 is hinged with a brake pedal 17; an angle sensor 18 is arranged at the hinged position of the brake pedal 17 and the vehicle body; the oil storage chamber 12 is connected with an oil inlet pipeline on the left cavity of the brake pump shell 10; an oil outlet on the left chamber of the brake pump shell 10 is connected with a P1 port on the three-position three-way electromagnetic valve 19 through a pipeline; the oil storage chamber 12 is connected with a P2 port on the three-position three-way electromagnetic valve 19; a port P3 on the three-position three-way electromagnetic valve 19 is connected with an oil inlet nozzle 403 on the caliper assembly 4 through a pipeline; the P1 port and P3 of the three-position three-way electromagnetic valve 19 are in a normal open state, and the P2 port and P3 are in a disconnected state;
the angle sensor 18, the wheel speed sensor 21, the electromagnetic coil group 7, the electromagnetic chuck assembly 8 and the three-position three-way electromagnetic valve 19 are all electrically connected with a controller 22; the wheel speed sensor 21 is fixedly arranged on a wheel; the controller 22 collects signals of the angle sensor 18 and the wheel speed sensor 21 in real time, and controls the electromagnetic coil group 7, the electromagnetic chuck assembly 8 and the three-position three-way electromagnetic valve 19 according to a control strategy;
when the vehicle brakes, a driver steps on the brake pedal 17, the brake pedal 17 pushes the second piston 16 to move left, and the second spring 15 is extruded and deformed by the second piston 16 to generate pedal simulation force; the controller 22 collects signals of the angle sensor 18 in real time to judge the operation of a driver, the controller 22 collects signals of the wheel speed sensor 21 in real time to judge the braking condition of a wheel, a control strategy is formulated, the controller 22 controls the magnitude of current in the electromagnetic coil group 7 to control the strength of a magnetic field so as to control the aggregation state of magnetorheological fluid, the controller 22 controls the magnitude of current of the electromagnetic sucker component 8 to change the adsorption force so as to change the magnitude of transmission torque and the rotating speed so as to control the rotating speed of a rotor 902 of the magnetorheological fluid brake 9, and further change the magnitude of braking force generated by the shearing force of the magnetorheological fluid;
if the driver continues to step on the brake pedal 17, the second piston 16 will push the first piston 13 to move left, the first piston 13 will let the brake fluid enter the oil inlet nozzle 403 on the caliper assembly 4 through the oil outlet of the brake pump housing 10 via the ports P1 and P3 of the three-position three-way electromagnetic valve 19, the brake fluid will push the brake piston 5 to move left, the brake piston 5 will push the left friction plate 2 and the right friction plate 3 to press the brake disc 1 to generate braking force;
if the controller 22 judges that the wheel is in a locking state according to the wheel speed sensor 21 signal acquired in real time, the controller 22 controls different working states of the three-position three-way electromagnetic valve 19 according to a control strategy to adjust the brake fluid pressure in the brake cylinder 402, and when a P1 port and a P3 port of the three-position three-way electromagnetic valve 19 are communicated, brake pressurization is carried out; when the P1 port, the P2 port and the P3 port of the three-position three-way electromagnetic valve 19 are all in a disconnected state, braking and pressure maintaining are carried out; when the P2 port and the P3 port of the three-position three-way electromagnetic valve 19 are communicated, braking decompression is carried out; the brake fluid pressure is in the states of pressure increasing, pressure maintaining and pressure reducing through different working states of the three-position three-way electromagnetic valve 19.
And when braking is finished, the components are reset.
Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (1)
1. A brake with auxiliary brake function, its characterized in that: the brake device comprises a brake disc (1), a left friction disc (2), a right friction disc (3), a caliper assembly (4), a brake piston (5), a fixed support (6), an electromagnetic coil group (7), an electromagnetic suction disc assembly (8), a magnetorheological fluid brake (9), a brake pump shell (10), a first spring (11), an oil storage chamber (12), a first piston (13), a limiting retainer ring (14), a second spring (15), a second piston (16), a brake pedal (17), an angle sensor (18), a three-position three-way electromagnetic valve (19), an energy accumulator (20), a wheel speed sensor (21) and a controller (22);
the brake disc (1) is connected with an axle bolt, the left friction plate (2) and the right friction plate (3) are respectively installed on the left side and the right side of the brake disc (1), and the left friction plate (2) and the right friction plate (3) are respectively installed in an adaptive groove on the caliper assembly (4) through back steel sheets on the left friction plate and the right friction plate so as to carry out rotation limiting; the caliper assembly (4) is fixedly arranged on a vehicle body;
the caliper assembly (4) comprises a caliper body (401), a brake cylinder (402) and an oil inlet nozzle (403); the left end of the brake cylinder (402) is fixedly arranged on the right side wall of the caliper body (401), and holes matched with the diameter size of the brake piston (5) are formed in the right side walls of the brake cylinder (402) and the caliper body (401); the oil inlet nozzle (403) is arranged at the tail part of the brake cylinder (402);
the brake piston (5) is installed in holes in the right side walls of the brake cylinder (402) and the caliper body (401) in a matched mode, and the left end of the brake piston (5) is in contact with the back steel sheet surface on the right friction plate (3); a sealing ring is arranged in an opening ring groove of the brake piston (5) opposite to the brake cylinder (402) and used for sealing brake fluid and resetting the brake piston (5) when braking is finished;
the magnetorheological fluid brake device is characterized in that the fixed support (6) is fixedly arranged on the clamp body (401), the electromagnetic coil group (7) is fixedly arranged on the right side of the annular support on the fixed support (6), and the magnetorheological fluid brake (9) is fixed on the left side of the annular support on the fixed support (6) through a bolt; the electromagnetic sucker component (8) and the magnetorheological fluid brake (9) are sleeved on the end cap of the brake disc (1);
the electromagnetic sucker component (8) comprises an electromagnetic sucker (801) and a sucker shaft sleeve (802); an electromagnet is arranged on the electromagnetic chuck (801); the electromagnetic chuck (801) is fixedly connected with the chuck shaft sleeve (802); the distance between the electromagnetic sucker (801) and the disc surface of the brake disc (1) is 0.2-1 mm; the sucking disc shaft sleeve (802) is arranged on an end cap of the brake disc (1) through a bearing sleeve, and a spline is processed on the outer side of the sucking disc shaft sleeve (802);
the magnetorheological fluid brake (9) comprises a fixed shell (901), a rotor (902), blades (903) and magnetorheological fluid; a spline and a retaining shoulder are machined in an axial hole of the rotor (902); the rotor (902) is in spline connection with the sucker shaft sleeve (802); the retaining shoulder on the rotor (902) is limited by the retaining ring on the end cap of the brake disc (1) in the axial movement way; at least 2 blades (903) are arranged on the rotor (902); the rotor (902) is connected with the fixed shell (901) through a sealing ring, and magnetorheological fluid is filled in the fixed shell (901);
the brake pump shell (10) is fixedly arranged on a vehicle body; the limiting retainer ring (14) is fixedly arranged on the inner wall of the brake pump shell (10) and divides the brake pump shell (10) into a left cavity and a right cavity; a first spring (11) and a first piston (13) are installed in the left chamber, the left end of the first spring (11) is in contact with the left end face of the left chamber of the brake pump shell (10), the right end of the first spring (11) is in contact with the first piston (13), and the first spring (11) is used for resetting the first piston (13); the second spring (15) and the second piston (16) are arranged in the right chamber, the left end of the second spring (15) is in contact with the limiting retainer ring (14), the right end of the second spring (15) is in contact with the second piston (16), and the second spring (15) is used for resetting the second piston (16); a push rod of the first piston (13) penetrates through a central hole of the limiting retainer ring (14) to penetrate into the right chamber, and a certain gap is reserved between the push rod and the second piston (16); a push rod of the second piston (16) is hinged with a brake pedal (17); an angle sensor (18) is arranged at the hinged position of the brake pedal (17) and the vehicle body; the oil storage chamber (12) is connected with an oil inlet pipeline on a left cavity of the brake pump shell (10); an oil outlet on the left chamber of the brake pump shell (10) is connected with a pipeline of a P1 port on the three-position three-way electromagnetic valve (19); the oil storage chamber (12) is connected with a pipeline of a P2 port on the three-position three-way electromagnetic valve (19); a P3 port on the three-position three-way electromagnetic valve (19) is connected with an oil inlet nozzle (403) on the caliper assembly (4) through a pipeline; the P1 port and P3 of the three-position three-way electromagnetic valve (19) are in a normal open state, and the P2 port and P3 are in a disconnected state;
the angle sensor (18), the wheel speed sensor (21), the electromagnetic coil group (7), the electromagnetic sucker component (8) and the three-position three-way electromagnetic valve (19) are all electrically connected with a controller (22); the wheel speed sensor (21) is fixedly arranged on a wheel; the controller (22) collects signals of the angle sensor (18) and the wheel speed sensor (21) in real time, and controls the electromagnetic coil group (7), the electromagnetic chuck assembly (8) and the three-position three-way electromagnetic valve (19) according to a control strategy;
when the vehicle brakes, a driver steps on a brake pedal (17), the brake pedal (17) pushes a second piston (16) to move left, and a second spring (15) is extruded and deformed by the second piston (16) to generate pedal simulation force; the controller (22) collects signals of the angle sensor (18) in real time to judge the operation of a driver, the controller (22) collects signals of the wheel speed sensor (21) in real time to judge the braking condition of a wheel, a control strategy is formulated, the controller (22) controls the current in the electromagnetic coil group (7) to control the strength of a magnetic field and further control the aggregation state of magnetorheological fluid, the controller (22) controls the current of the electromagnetic sucker component (8) to control the adsorption force and further change the magnitude of the transmission torque and the rotating speed, and further control the rotating speed of a rotor (902) of the magnetorheological fluid brake (9), and further change the magnitude of the braking force generated by the shearing force of the magnetorheological fluid;
if a driver continues to step on the brake pedal (17), the second piston (16) can push the first piston (13) to move left, the first piston (13) enables brake fluid to enter an oil inlet nozzle (403) on the caliper assembly (4) through an oil outlet of a brake pump shell (10) through a port P1 and a port P3 of the three-position three-way electromagnetic valve (19), the brake fluid pushes the brake piston (5) to move left, and the brake piston (5) pushes the left friction plate (2) and the right friction plate (3) to press the brake disc (1) to generate braking force;
if the controller (22) judges that the wheels are in a locking state according to the wheel speed sensor (21) signals collected in real time, the controller (22) controls different working states of the three-position three-way electromagnetic valve (19) according to a control strategy to adjust the brake fluid pressure in the brake cylinder (402), and when a P1 port and a P3 port of the three-position three-way electromagnetic valve (19) are communicated, brake pressurization is carried out; when the P1 port, the P2 port and the P3 port of the three-position three-way electromagnetic valve (19) are all in a disconnected state, braking and pressure maintaining are carried out; when a P2 port and a P3 port of the three-position three-way electromagnetic valve (19) are communicated, braking decompression is carried out; the brake fluid pressure is in a pressure increasing state, a pressure maintaining state and a pressure reducing state through different working states of the three-position three-way electromagnetic valve (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110129695.3A CN112727951B (en) | 2021-01-29 | 2021-01-29 | Brake with auxiliary braking function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110129695.3A CN112727951B (en) | 2021-01-29 | 2021-01-29 | Brake with auxiliary braking function |
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| CN112727951A CN112727951A (en) | 2021-04-30 |
| CN112727951B true CN112727951B (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110129695.3A Expired - Fee Related CN112727951B (en) | 2021-01-29 | 2021-01-29 | Brake with auxiliary braking function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI795695B (en) * | 2020-11-26 | 2023-03-11 | 國立臺北科技大學 | Controllable rotary brake |
| CN114922920B (en) * | 2022-02-09 | 2023-06-30 | 富奥汽车零部件股份有限公司 | High-pressure cycloid rotor type magnetorheological fluid retarder electric control system and control method |
| CN115076258B (en) * | 2022-06-02 | 2024-04-26 | 厦门满裕自动化科技有限公司 | Disc machine braking system |
| CN115140671A (en) * | 2022-09-05 | 2022-10-04 | 徐州立方机电设备制造有限公司 | Winch capable of automatically triggering safety brake in emergency |
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| CN112727951A (en) | 2021-04-30 |
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