CN112727952B - Electro-hydraulic brake-by-wire with self-power-taking function - Google Patents

Electro-hydraulic brake-by-wire with self-power-taking function Download PDF

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Publication number
CN112727952B
CN112727952B CN202110129717.6A CN202110129717A CN112727952B CN 112727952 B CN112727952 B CN 112727952B CN 202110129717 A CN202110129717 A CN 202110129717A CN 112727952 B CN112727952 B CN 112727952B
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China
Prior art keywords
disc
brake
oil
piston
friction plate
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Expired - Fee Related
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CN202110129717.6A
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Chinese (zh)
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CN112727952A (en
Inventor
张竹林
周长峰
蒋德飞
阮帅
邹彦冉
许本博
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Shandong Jiaotong University
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Shandong Jiaotong University
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Publication of CN112727952A publication Critical patent/CN112727952A/en
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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
    • 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
    • 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
    • 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/10—Plural pistons interacting by fluid pressure, e.g. hydraulic force amplifiers using different sized pistons
    • 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
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/008—Trigger mechanisms
    • 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
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/08—Self-amplifying or de-amplifying mechanisms
    • F16D2127/085—Self-amplifying or de-amplifying mechanisms having additional fluid pressure elements
    • 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
    • F16D2129/00—Type of operation source for auxiliary mechanisms
    • F16D2129/02—Fluid-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
    • F16D2129/00—Type of operation source for auxiliary mechanisms
    • F16D2129/06—Electric or magnetic
    • F16D2129/08—Electromagnets

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  • 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 an electro-hydraulic brake with a self-force-taking function, which comprises a brake disc, a left friction plate, a right friction plate, calipers, a cylinder body, a servo valve, an oil storage tank, a brake piston, a high-pressure oil pipe, an oil inlet pipe, a support frame, a plunger pump assembly, a rotary disc, an electromagnetic force-taking disc, an energy accumulator, a wheel speed sensor, an oil pressure sensor and a controller, wherein the brake disc is arranged on the left friction plate; the servo valve is connected with the cylinder body and the oil storage tank through pipelines; the servo valve is connected with an oil outlet on the support frame through a high-pressure oil pipe, and an energy accumulator is arranged on the high-pressure oil pipe; the oil storage tank is connected with an oil inlet of the support frame through an oil inlet pipe; the wheel speed sensor, the oil pressure sensor, the servo valve and the electromagnetic power takeoff disc are all electrically connected with the controller; the invention adopts the power takeoff device as a power source of the brake pressure of the brake, adopts the energy accumulator to quickly eliminate the brake clearance and build the pressure, has higher response frequency, shorter response time and control precision, and can effectively shorten the brake distance and improve the running safety of the vehicle.

Description

Electro-hydraulic brake-by-wire with self-power-taking function
Technical Field
The invention relates to the field of automobile brakes, in particular to an electro-hydraulic brake-by-wire with a self-force-taking function.
Background
The brake-by-wire technology is a novel brake technology appearing in recent years, a brake and a brake pedal do not depend on mechanical or hydraulic connection, a part of or all brake pipelines are replaced by electric wires, and an electric control element is operated by a controller to control the magnitude of braking force, so that the stable and reliable brake control of an automobile is realized. At present, the brake-by-wire system mainly comprises an electronic hydraulic brake system (EHB) and an electronic mechanical brake system (EMB). The brake-by-wire system is beneficial to optimizing the braking performance of the whole vehicle, and can be conveniently integrated with other electronic control systems such as ABS, ASR, ESP and the like, so that the system has wide development space. Especially as a brake system for an unmanned vehicle, is considered to be better by those skilled in the art.
The technical scheme of the prior electronic mechanical brake system (EMB) is that a motor drives a mechanical mechanism to realize a braking process, so that the structure of the brake system is greatly simplified, and the brake is easier to arrange, assemble and overhaul. The existing electronic mechanical brake system mostly adopts a brake motor and a speed reducing mechanism or a force increasing mechanism as power sources, so that the overall structure size is larger. In the braking process, the braking motor is always in a locked-rotor state, so that the requirement on the performance of the braking motor is high. In order to ensure enough braking torque, the main technical scheme adopted at present is a motor acceleration and deceleration mechanism, but the deceleration mechanism can cause slow braking response and increase the braking distance of a vehicle.
The electronic hydraulic brake system (EHB) is formed by transforming the traditional hydraulic brake system, the braking process is quicker and more stable, the braking safety and the comfort of an automobile are improved, but the electronic hydraulic brake system does not have all the advantages of a complete brake-by-wire system because a hydraulic component is reserved, and is generally regarded as an advanced product of an electronic mechanical brake system (EMB). The original hydraulic pipeline is reserved, and the technical problem of slow brake response caused by long hydraulic pipeline is still not solved. Meanwhile, the brake pipeline can be elastically deformed under the action of high-pressure brake oil, so that the pressure fluctuation of the brake oil in the brake pipeline is caused, and the accurate control of the vehicle brake is greatly influenced.
In summary, the brake-by-wire system needs to solve the following key problems: (1) the brake clearance is quickly eliminated, the brake response time is shortened, and the quick pressure build is realized; (2) the brake power system has high response frequency and control precision.
Disclosure of Invention
The invention provides an electro-hydraulic brake-by-wire with a self-power-taking function aiming at the defects of the existing brake-by-wire system, a power-taking device is adopted as a power source of brake pressure of a brake, a longer brake pipeline of a conventional hydraulic brake system is omitted, the electro-hydraulic brake-by-wire has higher response frequency and control precision, and can effectively shorten the brake distance and improve the running safety of a vehicle.
The invention is realized by the following technical measures:
an electro-hydraulic brake with a self-force-taking function comprises a brake disc, a left friction disc, a right friction disc, calipers, a cylinder body, a servo valve, an oil storage tank, a brake piston, a high-pressure oil pipe, an oil inlet pipe, a support frame, a plunger pump assembly, a rotary disc, an electromagnetic force-taking disc, an energy accumulator, a wheel speed sensor, an oil pressure 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 through back steel sheets on the left friction plate and the right friction plate so as to carry out rotation limiting; the calipers are fixedly arranged on a vehicle body; the cylinder body is fixedly connected with the calipers; the brake piston is sleeved in the cylinder body, the left end face of the brake piston is in contact with the back steel sheet surface on the right friction plate, the right end of the brake piston and the cylinder body form a hydraulic cavity, and during braking, high-pressure brake oil in the hydraulic cavity pushes the right end face of the brake piston to move left so as to push the right friction plate to press the brake disc to form braking force; a rubber sealing ring is arranged in an annular groove of the brake piston, which is opposite to the cylinder body, and is used for sealing brake oil and resetting the brake piston when braking is finished; the servo valve and the oil storage tank are fixedly arranged on a support frame, and the support frame is fixed on the calipers;
the electromagnetic power take-off disc comprises a power take-off ring disc and a power take-off disc shaft sleeve; the power take-off ring disc is fixedly connected with the power take-off disc shaft sleeve; an electromagnet is arranged on the disc surface of the power take-off ring disc; a spline is processed on the outer wall surface of the power take-off disc shaft sleeve; the electromagnetic power take-off disc is arranged on the end cap of the brake disc through a sliding bearing sleeve and can move axially along the end cap of the brake disc;
the rotary table comprises an inclined plane disc and a rotary table shaft sleeve; the bevel disc and the rotary disc shaft sleeve are fixedly connected; the inner hole of the rotary table shaft sleeve is provided with a spline and a retaining shoulder; the turntable shaft sleeve is in splined connection with the power take-off disc shaft sleeve, a clamping ring is arranged on an end cap of the brake disc, and the turntable is axially limited through the clamping ring and a retaining shoulder on the turntable shaft sleeve; the inclined plane on the inclined plane disc is contacted with a piston push rod on the plunger pump assembly, and when the inclined plane disc rotates, the piston push rod is pushed to move rightwards through the inclined plane on the inclined plane disc, so that the piston is pushed to generate high-pressure brake oil;
the servo valve is connected with the cylinder body and the oil storage tank through pipelines; the servo valve is connected with an oil outlet on the support frame through a high-pressure oil pipe, and an energy accumulator is arranged on the high-pressure oil pipe; the oil storage tank is connected with an oil inlet of the support frame through an oil inlet pipe;
the plunger pump assemblies are in a modular design, and the installation number of the plunger pump assemblies is set according to the vehicle braking parameter requirement; the plunger pump assembly comprises a pump body, a piston push rod, an oil inlet check valve, an oil outlet check valve, a piston and a return spring; the plunger pump assembly is fixedly arranged on the annular supporting wall of the supporting frame through a pump body on the plunger pump assembly; the piston push rod is fixedly connected with the piston; the piston and the inner hole of the pump body form a hydraulic cavity, a return spring is arranged in the hydraulic cavity and used for returning the piston, and the oil inlet check valve and the oil outlet check valve are communicated with the hydraulic cavity pipeline;
the annular supporting wall of the supporting frame is provided with an oil inlet and an oil outlet, and the number of the oil inlets and the oil outlets is matched with the number of the plunger pump assemblies; the oil inlet and the oil outlet are respectively connected with pipelines of a port P0 and a port P1 of the plunger pump assembly;
the wheel speed sensor, the oil pressure sensor, the servo valve and the electromagnetic power takeoff disc are all electrically connected with the controller; the wheel speed sensor is fixedly arranged on a wheel; the oil pressure sensor is arranged in an oil cavity formed by the cylinder body and the brake piston; the controller collects signals of a wheel speed sensor and an oil pressure sensor in real time to judge the braking condition of the wheel;
when the vehicle brakes, the controller controls the servo valve to work, brake oil of the energy accumulator rapidly flows into an oil cavity of the cylinder body, and brake fluid pushes the right end face of the brake piston to move left, so that the right friction plate is pressed tightly, and a brake gap is rapidly eliminated; the controller controls the electromagnet on the electromagnetic power taking disc to be electrified, so that the power taking ring disc moves leftwards to be in contact with a brake disc to perform torque transmission, the brake disc drives the power taking ring disc to rotate and further drives the turntable to rotate, the turntable rotates through an inclined disc on the turntable, the inclined disc pushes a piston push rod to move rightwards to generate high-pressure brake oil, the high-pressure brake oil enters an oil cavity of the cylinder body through a high-pressure oil pipe and a servo valve, the brake oil pushes the right end face of a brake piston to move leftwards to compress a right friction plate, and the left friction plate and the right friction plate compress the brake disc to form braking force under the support of the calipers; if the controller judges that the wheels are locked by acquiring signals of the wheel speed sensors and according to a control strategy, the controller changes the electromagnetic attraction force of the electromagnetic power take-off disc by controlling the current of the electromagnet on the electromagnetic power take-off disc so as to control the transmission torque of the power take-off disc, thereby changing the pressure of brake oil; the controller controls the servo valve to flow excessive brake oil into the oil storage tank;
when braking is finished, the controller cuts off the current on the electromagnet on the electromagnetic power taking disc and cuts off torque transmission; the components are reset.
Furthermore, the contact end of the piston push rod and the inclined surface of the rotary table is spherical.
Furthermore, the distance between the power take-off ring disc and the disc surface of the brake disc is 0.1-1 mm.
The invention has the beneficial effects that:
the electro-hydraulic brake-by-wire with the self-force-taking function adopts a force-taking device as a power source of brake pressure, eliminates a longer brake pipeline of a conventional hydraulic brake system, adopts an energy accumulator to quickly eliminate brake clearance and establish brake pressure, has higher response frequency, shorter response time and control precision, and can effectively shorten the brake distance and improve the running safety of a vehicle.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects:
1. the power taking device is used as a power source of brake pressure, the existing electro-hydraulic brake-by-wire system is cancelled, a motor is used for building brake pressure and a longer hydraulic brake pipeline is adopted, and the problem of brake pressure fluctuation caused by elastic deformation of the brake pipeline is effectively solved; the brake response speed and the control precision are high;
2. the power takeoff device designed by the invention has good vehicle speed follow-up property, and the higher the vehicle speed is, the faster the pressure build-up of a braking system is, so that the power takeoff device has better driving feeling;
3. and a brake-by-wire mode is adopted, so that system integration with ABS, EBD and the like is facilitated, and higher control precision is achieved.
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 partial structural schematic diagram of the present invention.
Fig. 5 is a partial structural schematic diagram of the present invention.
Fig. 6 is a schematic structural diagram of an electromagnetic power takeoff disk of the invention.
Fig. 7 is a schematic view of the turntable structure of the present invention.
Fig. 8 is a schematic view of the cylinder structure of the present invention.
FIG. 9 is a schematic view of a caliper structure according to the present invention.
Fig. 10 is a schematic view of the supporting frame of 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, 5-cylinder, 6-servo valve, 7-oil storage tank, 8-brake piston, 9-high pressure oil pipe, 10-oil inlet pipe, 11-support frame, 12-plunger pump assembly, 1201-pump body, 1202-piston push rod, 1203-oil inlet check valve, 1204-oil outlet check valve, 1205-piston, 1206-reset spring, 13-rotary disc, 1301-inclined plane disc, 1302-rotary disc shaft sleeve, 14-electromagnetic power takeoff disc, 1401-power takeoff ring disc, 1402-power takeoff disc shaft sleeve, 15-energy accumulator, 16-wheel speed sensor, 17-oil pressure sensor and 18-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.
An electro-hydraulic brake-by-wire with a self-power-taking function is shown in fig. 1, fig. 2, fig. 3 and fig. 4, and comprises a brake disc 1, a left friction disc 2, a right friction disc 3, calipers 4, a cylinder 5, a servo valve 6, an oil storage tank 7, a brake piston 8, a high-pressure oil pipe 9, an oil inlet pipe 10, a support frame 11, a plunger pump assembly 12, a rotary disc 13, an electromagnetic power-taking disc 14, an energy accumulator 15, a wheel speed sensor 16, an oil pressure sensor 17 and a controller 18;
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 4 through back steel sheets on the left friction plate and the right friction plate for rotation limiting; the calipers 4 are fixedly arranged on a vehicle body; the cylinder body 5 is fixedly connected with the caliper 4; the brake piston 8 is sleeved in the cylinder body 5, the left end face of the brake piston 8 is in contact with the back steel sheet surface on the right friction plate 3, the right end of the brake piston 8 and the cylinder body 5 form a hydraulic cavity, and during braking, high-pressure brake oil in the hydraulic cavity pushes the right end face of the brake piston 8 to move left and further pushes the right friction plate 3 to press the brake disc 1 to form braking force; a rubber sealing ring is arranged in an annular groove of the brake piston 8 opposite to the cylinder body 5 and used for sealing brake oil and resetting the brake piston 8 after braking is finished; the servo valve 6 and the oil storage tank 7 are fixedly arranged on a support frame 11, and the support frame 11 is fixed on the caliper 4;
as shown in fig. 6, the electromagnetic power take-off disk 14 comprises a power take-off ring 1401, a power take-off disk shaft sleeve 1402; the power take-off ring disc 1401 and the power take-off disc shaft sleeve 1402 are fixedly connected; an electromagnet is arranged on the disc surface of the power take-off ring disc 1401; a spline is processed on the outer wall surface of the power take-off disc shaft sleeve 1402; the electromagnetic power take-off disc 14 is mounted on the end cap of the brake disc 1 through a sliding bearing sleeve and can move axially along the end cap of the brake disc 1;
as shown in fig. 7, the turntable 13 includes a bevel disk 1301 and a turntable sleeve 1302; the bevel disc 1301 and the turntable shaft sleeve 1302 are fixedly connected; the inner hole of the turntable shaft sleeve 1302 is provided with a spline and a retaining shoulder; the turntable shaft sleeve 1302 is in spline connection with the power take-off disc shaft sleeve 1402, a clamping ring is installed on an end cap of the brake disc 1, and the turntable 13 is axially limited through the clamping ring and a retaining shoulder on the turntable shaft sleeve 1302; the inclined plane on the inclined plane disc 1301 is in contact with the piston push rod 1202 on the plunger pump assembly 12, and when the inclined plane disc 1301 rotates, the piston push rod 1202 is pushed to move rightwards through the inclined plane on the inclined plane disc 1301, so that the piston 1205 is pushed to generate high-pressure brake oil;
as shown in fig. 11, the servo valve 6 is connected with the cylinder 5 and the oil storage tank 7 through pipelines; the servo valve 6 is connected with an oil outlet on the support frame 11 through a high-pressure oil pipe 9, and an energy accumulator 15 is arranged on the high-pressure oil pipe 9; the oil storage tank 7 is connected with an oil inlet of the support frame 11 through an oil inlet pipe 10 by a pipeline;
as shown in fig. 11, the plunger pump assemblies 12 are in a modular design, and the number of the plunger pump assemblies 12 is set according to the vehicle braking parameter requirement; the plunger pump assembly 12 comprises a pump body 1201, a piston push rod 1202, an oil inlet check valve 1203, an oil outlet check valve 1204, a piston 1205 and a return spring 1206; the plunger pump assembly 12 is fixedly arranged on the annular supporting wall of the supporting frame 11 through a pump body 1201 on the plunger pump assembly; the piston push rod 1202 is fixedly connected with the piston 1205; the piston 1205 and the inner hole of the pump body 1201 form a hydraulic cavity, a reset spring 1206 is installed in the hydraulic cavity and used for resetting the piston 1205, and the oil inlet check valve 1203 and the oil outlet check valve 1204 are both communicated with a pipeline of the hydraulic cavity;
as shown in fig. 10, the annular supporting wall of the supporting frame 11 is provided with oil inlets and oil outlets, and the number of the oil inlets and the oil outlets is adapted to the number of the plunger pump assemblies 12; as shown in fig. 11, the oil inlet and the oil outlet are respectively connected with pipes of a port P0 and a port P1 of the plunger pump assembly 12;
the wheel speed sensor 16, the oil pressure sensor 17, the servo valve 6 and the electromagnetic power takeoff disc 14 are all electrically connected with a controller 18; the wheel speed sensor 16 is fixedly arranged on a wheel; the oil pressure sensor 17 is arranged in an oil cavity formed by the cylinder body 5 and the brake piston 8; the controller 18 collects signals of the wheel speed sensor 16 and the oil pressure sensor 17 in real time to judge the braking condition of the wheel;
when the vehicle brakes, the controller 18 controls the servo valve 6 to work, brake oil of the energy accumulator 15 quickly flows into an oil cavity of the cylinder body 5, brake fluid pushes the right end face of the brake piston 8 to move left, so that the right friction plate 3 is pressed tightly, and a brake gap is quickly eliminated; the controller 18 controls the electromagnet on the electromagnetic power taking disc 14 to be electrified, so that the power taking ring disc 1401 moves leftwards to contact with the brake disc 1 to transmit torque, the brake disc 1 drives the power taking ring disc 1401 to rotate, and further drives the rotary disc 13 to rotate, the rotary disc 13 rotates through the inclined disc 1301 thereon, the inclined disc 1301 pushes the piston push rod 1202 to move rightwards to generate high-pressure brake oil, the high-pressure brake oil enters an oil cavity of the cylinder body 5 through the high-pressure oil pipe 9 and the servo valve 6, the brake oil pushes the right end face of the brake piston 8 to move leftwards to press the right friction plate 3, and the left friction plate 2 and the right friction plate 3 press the brake disc 1 to form braking force under the support of the calipers 4; if the controller 18 judges that the wheels are locked by collecting signals of the wheel speed sensors 16 and according to a control strategy, the controller 18 changes the electromagnetic attraction by controlling the current of the electromagnet on the electromagnetic power take-off disc 14, and further controls the transmission torque of the power take-off ring disc 1401, so that the brake oil pressure is changed; the controller 18 controls the servo valve 6 to flow the excess brake fluid into the reservoir 7;
when braking is finished, the controller 18 cuts off the current on the electromagnet on the electromagnetic power takeoff disc 14 and cuts off torque transmission; the components are reset.
The contact end of the piston push rod 1202 and the inclined surface of the rotary disc 13 is spherical.
The distance between the power take-off ring disc 1401 and the disc surface of the brake disc 1 is 0.1-1 mm.
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 (3)

1. The utility model provides an electricity liquid brake-by-wire with from power takeoff function which characterized in that: the brake comprises a brake disc (1), a left friction disc (2), a right friction disc (3), calipers (4), a cylinder body (5), a servo valve (6), an oil storage tank (7), a brake piston (8), a high-pressure oil pipe (9), an oil inlet pipe (10), a support frame (11), a plunger pump assembly (12), a rotary disc (13), an electromagnetic power takeoff disc (14), an energy accumulator (15), a wheel speed sensor (16), an oil pressure sensor (17) and a controller (18);
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 (4) through back steel sheets on the left friction plate and the right friction plate to carry out rotation limiting; the calipers (4) are fixedly arranged on a vehicle body; the cylinder body (5) is fixedly connected with the caliper (4); the brake piston (8) is sleeved in the cylinder body (5), the left end face of the brake piston (8) is in contact with the back steel sheet surface on the right friction plate (3), the right end of the brake piston (8) and the cylinder body (5) form a hydraulic cavity, and during braking, high-pressure brake oil in the hydraulic cavity pushes the right end face of the brake piston (8) to move left and further pushes the right friction plate (3) to press the brake disc (1) to form braking force; a rubber sealing ring is arranged in an annular groove of the brake piston (8) opposite to the cylinder body (5) and used for sealing brake oil and resetting the brake piston (8) after braking is finished; the servo valve (6) and the oil storage tank (7) are fixedly arranged on a support frame (11), and the support frame (11) is fixed on the caliper (4);
the electromagnetic power take-off disc (14) comprises a power take-off ring disc (1401) and a power take-off disc shaft sleeve (1402); the power take-off ring disc (1401) and the power take-off disc shaft sleeve (1402) are fixedly connected; an electromagnet is arranged on the surface of the power take-off ring disc (1401); a spline is processed on the outer wall surface of the power take-off disc shaft sleeve (1402); the electromagnetic power take-off disc (14) is mounted on an end cap of the brake disc (1) through a sliding bearing sleeve and can move axially along the end cap of the brake disc (1);
the rotary disc (13) comprises a bevel disc (1301) and a rotary disc shaft sleeve (1302); the bevel disc (1301) and the rotary disc shaft sleeve (1302) are fixedly connected; the inner hole of the turntable shaft sleeve (1302) is provided with a spline and a retaining shoulder; the rotary table shaft sleeve (1302) is in splined connection with the power take-off disc shaft sleeve (1402), a clamping ring is installed on an end cap of the brake disc (1), and the rotary table (13) is axially limited through the clamping ring and a retaining shoulder on the rotary table shaft sleeve (1302); an inclined plane on the inclined plane disc (1301) is in contact with a piston push rod (1202) on the plunger pump assembly (12), and when the inclined plane disc (1301) rotates, the piston push rod (1202) is pushed to move rightwards through the inclined plane on the inclined plane disc, so that a piston (1205) is pushed to generate high-pressure brake oil;
the servo valve (6) is connected with the cylinder body (5) and the oil storage tank (7) through pipelines; the servo valve (6) is connected with an oil outlet on the support frame (11) through a high-pressure oil pipe (9), and an energy accumulator (15) is arranged on the high-pressure oil pipe (9); the oil storage tank (7) is connected with an oil inlet of the support frame (11) through an oil inlet pipe (10) by a pipeline;
the plunger pump assemblies (12) are in a modular design, and the installation number of the plunger pump assemblies (12) is set according to the vehicle braking parameter requirement; the plunger pump assembly (12) comprises a pump body (1201), a piston push rod (1202), an oil inlet one-way valve (1203), an oil outlet one-way valve (1204), a piston (1205) and a return spring (1206); the plunger pump assembly (12) is fixedly arranged on the annular supporting wall of the supporting frame (11) through a pump body (1201) on the plunger pump assembly; the piston push rod (1202) is fixedly connected with a piston (1205); the oil pump is characterized in that a hydraulic cavity is formed by the piston (1205) and an inner hole of the pump body (1201), a reset spring (1206) is installed in the hydraulic cavity and used for resetting the piston (1205), and the oil inlet check valve (1203) and the oil outlet check valve (1204) are communicated with a pipeline of the hydraulic cavity;
an oil inlet and an oil outlet are formed in the annular supporting wall of the supporting frame (11), and the number of the oil inlets and the number of the oil outlets are matched with that of the plunger pump assemblies (12); the oil inlet and the oil outlet are respectively connected with pipelines of a P0 port and a P1 port of the plunger pump assembly (12);
the wheel speed sensor (16), the oil pressure sensor (17), the servo valve (6) and the electromagnetic power takeoff disc (14) are all electrically connected with a controller (18); the wheel speed sensor (16) is fixedly arranged on a wheel; the oil pressure sensor (17) is arranged in an oil cavity formed by the cylinder body (5) and the brake piston (8); the controller (18) collects signals of the wheel speed sensor (16) and the oil pressure sensor (17) in real time to judge the braking condition of the wheel;
when a vehicle is braked, the controller (18) controls the servo valve (6) to work, brake oil of the energy accumulator (15) quickly flows into an oil cavity of the cylinder body (5), and brake fluid pushes the right end face of the brake piston (8) to move left, so that the right friction plate (3) is pressed tightly, and a brake gap is quickly eliminated; the controller (18) controls the electromagnet on the electromagnetic power taking disc (14) to be electrified, so that the power taking ring disc (1401) moves left to contact with the brake disc (1) to transmit torque, the brake disc (1) drives the power taking ring disc (1401) to rotate, and further drives the rotary disc (13) to rotate, the rotary disc (13) rotates through the inclined disc (1301) on the rotary disc, the inclined disc (1301) pushes the piston push rod (1202) to move right to generate high-pressure brake oil, the high-pressure brake oil enters an oil cavity of the cylinder body (5) through the high-pressure oil pipe (9) and the servo valve (6), the brake oil pushes the right end face of the brake piston (8) to move left to press the right friction plate (3), and the left friction plate (2) and the right friction plate (3) are supported by the caliper (4) to press the brake disc (1) to form braking force; if the controller (18) judges that the wheels are locked by collecting signals of the wheel speed sensors (16) and according to a control strategy, the controller (18) changes the electromagnetic attraction by controlling the current of the electromagnet on the electromagnetic power taking disc (14) so as to control the transmission torque of the power taking ring disc (1401) and further change the pressure of brake oil; the controller (18) controls the servo valve (6) to flow excessive brake oil into the oil storage tank (7);
when braking is finished, the controller (18) cuts off the current on the electromagnet on the electromagnetic power taking disc (14) and cuts off torque transmission; the components are reset.
2. The electro-hydraulic brake-by-wire with self-pickup function according to claim 1, characterized in that: the contact end of the piston push rod (1202) and the inclined surface of the rotating disc (13) is spherical.
3. The electro-hydraulic brake-by-wire with self-pickup function according to claim 1, characterized in that: the distance between the power take-off ring disc (1401) and the disc surface of the brake disc (1) is 0.1-1 mm.
CN202110129717.6A 2021-01-29 2021-01-29 Electro-hydraulic brake-by-wire with self-power-taking function Expired - Fee Related CN112727952B (en)

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