CN115431941A - Novel decoupling type electro-hydraulic brake system - Google Patents
Novel decoupling type electro-hydraulic brake system Download PDFInfo
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- CN115431941A CN115431941A CN202211286528.0A CN202211286528A CN115431941A CN 115431941 A CN115431941 A CN 115431941A CN 202211286528 A CN202211286528 A CN 202211286528A CN 115431941 A CN115431941 A CN 115431941A
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- input rod
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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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/24—Electrodynamic brake systems for vehicles in general with additional mechanical or electromagnetic braking
- B60L7/26—Controlling the braking effect
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- Power Engineering (AREA)
- Braking Elements And Transmission Devices (AREA)
Abstract
The invention discloses a novel decoupling type electro-hydraulic brake system, which relates to the technical field of automobile brake systems and comprises the following components: a main housing; the hydraulic mechanism is connected with the main shell, and a brake master cylinder of the hydraulic mechanism extends into the main shell; one end of the pedal input rod extends into the main shell from one end, far away from the hydraulic mechanism, of the main shell, and a gap exists between the pedal input rod and a brake master cylinder of the hydraulic mechanism; the displacement sensor sensing chip is arranged on the main shell; the displacement sensor magnetic steel component is arranged on the pedal input rod; the gear transmission device comprises a motor and a brake assembly, the brake assembly is sleeved on the pedal input rod, the motor is arranged on the main shell and is in transmission connection with the brake assembly, and the motor is electrically connected with the displacement sensor induction chip; the pedal rod simulation device is arranged outside the main shell. The invention can realize the decoupling of the braking force of the brake pedal and the hydraulic braking force, improve the ratio of motor braking, and further increase the energy recovery.
Description
Technical Field
The invention relates to the technical field of automobile brake systems, in particular to a novel decoupling type electro-hydraulic brake system.
Background
At present, a motor vehicle braking system usually depends on an engine air inlet system to provide a vacuum source for a brake booster, so as to pressurize and boost a brake master cylinder, improve the brake response speed for brake operators, shorten the vehicle braking distance and improve the vehicle safety. However, such a mechanical booster cannot provide sufficient braking assistance to the brake system without a vacuum level or without an insufficient vacuum level.
In order to solve the problem of insufficient boosting, most manufacturers propose an electric boosting braking scheme, that is, vacuum boosting is replaced by motor boosting, and the system generally comprises a power unit, a transmission unit, a controller and a brake master cylinder, wherein the controller is used for controlling the power unit (generally a brushless motor or a brush motor) to rapidly respond or stop according to the braking force demand of a driver.
At present, a plurality of manufacturers design the brake pedal and the brake wheel cylinder to be non-decoupled, in a deceleration process, as long as the brake pedal is stepped on, the brake wheel cylinder can generate brake by hydraulic pressure, the recovery of brake energy cannot be realized, even if the brake is completed by superposing electric brake on mechanical hydraulic brake in a control strategy, the recovery rate of energy is low, and the structure limits the popularization and the use of products, especially the application on electric vehicles.
There are two common types of displacement sensors, hall-effect and sliding-vane resistance. The Hall induction type sensor utilizes the principle of Hall effect, has the advantages of high sensitivity and small volume, and has the defects of poor interchangeability, signal variation along with temperature, nonlinear output and the need of utilizing a singlechip to carry out nonlinear and temperature correction. The sliding vane resistance type displacement sensor has large time drift and temperature drift when in use, and real and effective data can not be obtained after long-time measurement.
In the aspect of a power transmission mode, a common mode in the industry is a worm and worm gear and gear rack two-stage transmission mode 1, a mode 2 is a gear transmission mode, and a screw and nut transmission two-stage transmission mode 2, nuts and gears are of a separated structure and are connected together through splines or other modes, and the separated structure cannot guarantee concentricity during assembly, so that transmission noise is large, and the service life is shortened.
Disclosure of Invention
In view of this, the invention provides a novel decoupling type electro-hydraulic brake system, which aims to solve one of the problems in the background art, and achieve decoupling of brake pedal braking force and master cylinder hydraulic mechanism braking force, so as to improve the ratio of electric braking and further increase energy recovery.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel decoupled electro-hydraulic braking system, comprising:
a main housing;
the hydraulic mechanism is connected with the main shell, and a brake master cylinder of the hydraulic mechanism extends into the main shell;
one end of the pedal input rod extends into the main shell from one end, far away from the hydraulic mechanism, of the main shell, and a gap exists between the end of the pedal input rod and a brake master cylinder of the hydraulic mechanism;
the displacement sensor sensing chip is arranged on the main shell;
the displacement sensor magnetic steel assembly is arranged on the pedal input rod and drives the displacement sensor magnetic steel assembly and the displacement sensor induction chip to generate relative displacement under the movement of the pedal input rod, so that the displacement sensor induction chip generates an electric signal;
the gear transmission device comprises a motor and a brake assembly, the brake assembly is sleeved on the pedal input rod, the motor is arranged on the main shell and is in transmission connection with the brake assembly, and the motor is electrically connected with the displacement sensor induction chip;
a pedal rod simulator disposed between the pedal input rod and the main housing outside the main housing.
Further, the brake assembly includes:
the axis of the transmission screw rod is provided with a penetrating cavity penetrating the pedal input rod, and the outer wall of the transmission screw rod is provided with threads;
the guide bracket is provided with a guide hole and is connected with one end of the transmission screw rod;
the axis of the nut gear is provided with a threaded hole, the outer wall of the nut gear is provided with threads, the transmission screw rod penetrates through the threaded hole, the threads on the outer wall of the nut gear are in transmission connection with the motor through a transmission assembly, and one end of the nut gear is in rotational connection with the inner wall of the main shell through a bearing;
the guide rod, the guide rod with main casing body fixed connection, the guide rod wears to establish in the guiding hole.
Further, the transmission assembly includes: the driving wheel is connected with an output shaft of the motor, and the idler wheel is meshed with the driving wheel and the threads on the outer wall of the nut gear respectively.
Further, a bushing is arranged in the guide hole.
Furthermore, a main cylinder cushion block is arranged at one end, far away from the transmission screw rod, of the guide support, and a return spring is arranged between the main cylinder cushion block and a brake main cylinder of the hydraulic mechanism.
Further, the pedal input rod comprises a pedal push rod and a main cylinder ejector rod, and one end, far away from the hydraulic mechanism, of the main cylinder ejector rod is connected with the pedal push rod.
Further, the displacement sensor magnetic steel assembly comprises annular magnetic steel, spacing pieces and a buffer piece, the pedal push rod is close to one end of the main cylinder ejector rod and an annular groove is formed between the main cylinder ejector rod, the annular magnetic steel is provided with a plurality of annular magnetic steel, the annular magnetic steel is sleeved in the annular groove at intervals and is adjacent to the spacing pieces, and the annular magnetic steel at two ends and the buffer piece is arranged between the pedal push rod and the main cylinder ejector rod.
Further, the pedal rod simulation device comprises a large spring, a small spring, a large spring seat, a small spring seat, simulation rubber and a simulator shell;
the simulator shell is fixedly connected with one end, provided with the pedal input rod, of the main shell, one end, close to the simulator shell, of the main shell is provided with a cylindrical extension section, the cylindrical extension section extends into the simulator shell, and the diameter of the cylindrical extension section is smaller than the diameter of the main body of the main shell;
the small spring seat is sleeved outside the cylindrical extension section of the main shell and is positioned in the simulator shell;
the small spring is sleeved outside the cylindrical extension section of the main shell, one end of the small spring is contacted with the end part of the main shell, and the other end of the small spring is contacted with the small spring seat;
the large spring seat is fixedly arranged on the pedal input rod outside the main shell;
the large spring is sleeved outside the pedal input rod, one end of the large spring is in contact with the small spring seat, and the other end of the large spring is in contact with the large spring seat;
the simulation rubber is arranged at one end, close to the small spring seat, of the large spring seat, and can be in contact with the cylindrical extension section of the main shell after the large spring and the small spring are compressed to a certain preset length.
Furthermore, be provided with on the footboard input rod and prevent changeing the concave surface, supply on the main casing body the position that footboard input rod stretched into is provided with prevents changeing the axle sleeve, prevent changeing the axle sleeve have with prevent changeing the convex surface of preventing of concave surface adaptation that prevents that sets up on the footboard input rod.
According to the technical scheme, compared with the prior art, the novel decoupling type electro-hydraulic brake system is provided, a gap is formed between a brake main cylinder of a hydraulic mechanism and the end portion of a pedal input rod, decoupling of brake force of a brake pedal and hydraulic brake force is further achieved, after the brake pedal is stepped on, a controller in the decoupling type electro-hydraulic brake system presumes the brake requirement of a driver on the current pedal displacement speed and the current pedal stroke through a displacement sensor induction chip, the required brake force is calculated, then a motor serves as a main torque providing source, and when the brake deceleration requirement is large and the brake force of the motor is insufficient (the motor capacity is smaller than the brake requirement), the hydraulic brake is used as compensation for the insufficient brake torque. Therefore, the ratio of motor braking is improved, and energy recovery is further increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a decoupling type electro-hydraulic brake system provided by the invention;
FIG. 2 is a schematic structural diagram of the decoupling type electro-hydraulic brake system provided by the invention at another view angle;
FIG. 3 isbase:Sub>A schematic view ofbase:Sub>A broken-away structure in the direction of A-A in FIG. 2 according to the present invention;
FIG. 4 is an enlarged view of a portion of C of FIG. 3 in accordance with the present invention;
FIG. 5 is a schematic structural view of a magnetic steel assembly of a pedal input rod and a displacement sensor provided in the present invention;
FIG. 6 is a schematic diagram of the structure of the working principle of the sensing chip of the displacement sensor according to the present invention;
FIG. 7 is a schematic structural view of a nut gear provided in the present invention;
FIG. 8 is a flow chart of the braking force transfer provided by the present invention;
FIG. 9 is a graphical illustration of brake pedal displacement versus force provided by the present invention.
Wherein: 1 is a main shell; 2 is a hydraulic mechanism; 3 is a pedal input rod; 31 is a pedal push rod; 32 is a main cylinder top rod; 4, a displacement sensor induction chip; 5 is a displacement sensor magnetic steel component; 51 is annular magnetic steel; a spacer 52; 53 is a buffer sheet; 6 is a gear transmission device; 61 is a motor; 62 is a brake assembly; 621 is a drive screw; 622 is a guide bracket; 623 a nut gear; 624 is a guide rod; a pedal rod simulation device is 7; 71 is a large spring; 72 is a small spring; 73 is a large spring seat; 74 is a small spring seat; 75 is a simulated rubber; a simulator housing 76; 8 is a transmission component; a driving wheel 81; 82 is an idler wheel; 9 is a return spring; and 10 is a dust cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 7, an embodiment of the present invention discloses a novel decoupling type electro-hydraulic brake system, including:
a main housing 1;
the hydraulic mechanism 2, the hydraulic mechanism 2 is connected with main casing 1, the brake master cylinder of the hydraulic mechanism 2 stretches into main casing 1;
one end of the pedal input rod 3 extends into the main shell 1 from one end, far away from the hydraulic mechanism 2, of the main shell 1, and a gap exists between the end of the pedal input rod 3 and a brake master cylinder of the hydraulic mechanism 2;
the displacement sensor sensing chip 4 is arranged on the main shell 1;
the displacement sensor magnetic steel component 5 is arranged on the pedal input rod 3, and the movement of the pedal input rod 3 drives the displacement sensor magnetic steel component 5 and the displacement sensor induction chip 4 to generate relative displacement so as to enable the displacement sensor induction chip 4 to generate an electric signal;
the gear transmission device 6 is characterized in that the gear transmission device 6 comprises a motor 61 and a brake assembly 62, the brake assembly 62 is sleeved on the pedal input rod 3, the motor 61 is arranged on the main shell 1 and is in transmission connection with the brake assembly 62, and the motor 61 is electrically connected with the displacement sensor sensing chip 4;
a pedal rod simulator 7, the pedal rod simulator 7 being disposed between the pedal input rod 3 located outside the main housing 1 and the main housing 1.
The hydraulic mechanism 2 is used for providing braking force of the hydraulic mechanism, the gear transmission device 6 and the pedal input rod 3 provide thrust together, a certain gap exists between one end, close to the hydraulic mechanism 2, of the pedal input rod 3 and a brake master cylinder of the hydraulic mechanism 2, one end, far away from the hydraulic mechanism 2, of the pedal input rod 3 is connected with the brake pedal, and due to the existence of the gap, under the working condition of motor-assisted braking, the thrust of the brake pedal driving the pedal input rod 3 cannot be directly transmitted to the brake master cylinder of the hydraulic mechanism 2, namely decoupling of the braking force of the brake pedal and the hydraulic braking force is achieved. The clearance between the hydraulic machine 2 and the master cylinder of the hydraulic machine 2 is typically set to between 10-15mm and can be adjusted. When the motor assisting or electric control system fails, the gap can be eliminated along with the movement of the pedal input rod 3, so that the end part of the pedal input rod 3 is directly contacted with a brake master cylinder of the hydraulic mechanism 2, the brake pedal force is directly transmitted to the hydraulic mechanism 2 through the pedal input rod 3, the brake hydraulic pressure is generated, and the deceleration or the parking of the vehicle is further realized.
In addition, the recovery of braking energy is carried out when the vehicle is in braking demand, after a driver steps on a brake pedal, the braking force of the pedal cannot directly reach a brake master cylinder, before the idle stroke is eliminated, a controller in the decoupling type electro-hydraulic braking system estimates the braking demand of the driver according to the current displacement speed and the current stroke of the pedal through a displacement sensor induction chip 4, the required braking force is calculated, then a motor 61 is used as a main torque to reversely drag and generate electricity to serve as a main braking force source, hydraulic braking is used as compensation of insufficient braking force, and the displacement sensor induction chip 4 and the idle stroke are provided, so that the proportion of braking of the motor 61 is improved, the generated electric energy is stored, and the energy recovery is further increased. Specifically, in the brake-by-wire mode, the driver does not need to step on the brake pedal, and the motor 61 brakes to generate thrust to directly enter the hydraulic brake mode. When the motor 61 or the electric control system fails, safe backup braking can be performed, the brake pedal force directly pushes the brake master cylinder of the hydraulic mechanism 2 through the pedal input rod 3 to generate hydraulic braking, so that the vehicle is decelerated or safely stopped.
In the present embodiment, the brake assembly 62 includes:
the axis of the transmission screw 621 is provided with a through cavity for the pedal input rod 3 to pass through, and the outer wall of the transmission screw 621 is provided with threads;
a guide bracket 622, wherein the guide bracket 622 is provided with a guide hole, and the guide bracket 622 is connected with one end of the transmission screw 621;
the axis of the nut gear 623 is provided with a threaded hole, the outer wall of the nut gear 623 is provided with a thread, the transmission screw 621 penetrates through the threaded hole, the thread on the outer wall of the nut gear 623 is in transmission connection with the motor 61 through the transmission assembly 8, and one end of the nut gear 623 is in rotary connection with the inner wall of the main shell 1 through a bearing;
the guide rod 624, the guide rod 624 and the main casing 1 are fixedly connected, and the guide rod 624 is arranged in the guide hole in a penetrating manner.
The nut gear 623 is arranged to be provided with a threaded hole on the axis, the outer wall of the nut gear 623 is provided with threads, and a traditional transmission nut and an output gear are integrated into a whole, so that the concentricity of two transmission pieces driven by the nut gear 623 can be ensured, the transmission screw 621 is ensured not to incline when being transmitted in the nut gear 623, and the eccentric wear of a piston of a brake master cylinder of the hydraulic mechanism 2 is avoided, and the risk of oil leakage failure is caused; compared with the traditional split structure of the transmission nut and the output gear, the structure adopting the nut gear 623 is more compact, the number of parts is reduced, the assembly manufacturability is optimized, the cost is lower, the problem that the traditional split structure of the transmission nut and the output gear is always connected through a spline and has clearance fit can be solved, and the transmission nut and the output gear have larger impact noise in the rotating process and influence the service life.
In the present embodiment, preferably, the transmission assembly 8 includes: a driving wheel 81 and an idle wheel 82, wherein the driving wheel 81 is connected with the output shaft of the motor 61, and the idle wheel 82 is respectively engaged with the driving wheel 81 and the screw thread on the outer wall of the nut gear 623. Through the arrangement of the driving pulley 81 and the idle pulley 82, the torque of the motor 61 can be transmitted to the transmission screw 621, and the transmission screw 621 is moved in the brake master cylinder direction of the hydraulic mechanism 2 in the axial direction of the pedal input rod 3 by the combined action of the nut gear 623, the guide bracket 622, and the guide rod 624.
In this embodiment, it is preferable that a bushing is provided in the guide hole, and the smoothness of the sliding of the guide bracket 622 along the guide rod 624 can be improved by the provision of the bushing. Specifically, one end of the guide bracket 622, which is far away from the transmission screw 621, is provided with a master cylinder pad, and a return spring 9 is arranged between the master cylinder pad and a brake master cylinder of the hydraulic mechanism 2. Because the transmission of the transmission screw 621 is a non-self-locking structure, and can be a double-head or multi-head screw transmission, in the boosting stage of the motor 61, the motor 61 drives the driving wheel 81 to rotate and transmit the rotation to the nut gear 623 through the idler gear 82, under the cooperation of the nut gear 623 and the transmission screw 621, the transmission screw 621 makes a linear displacement along the pedal input rod 3 and moves towards one end of the hydraulic mechanism 2, through arranging a master cylinder cushion block at one end of the guide bracket 622 away from the transmission screw 621, the master cylinder cushion block moves towards the hydraulic mechanism 2 along with the guide bracket 622, the return spring 9 is compressed, and meanwhile, the master cylinder cushion block pushes a piston of a brake master cylinder of the hydraulic mechanism 2 to move to generate brake hydraulic pressure, after the brake pedal is released, the pedal input rod 3 moves towards the direction away from the hydraulic mechanism 2, the boosting of the motor is released, and the return spring 9 reversely pushes the master cylinder and the transmission screw 621 to return to the initial position.
In the present embodiment, it is preferable that the pedal input rod 3 includes a pedal push rod 31 and a master cylinder rod 32, and an end of the master cylinder rod 32 remote from the hydraulic mechanism 2 is connected to the pedal push rod 31. Specifically, displacement sensor magnetic steel component 5 includes annular magnet steel 51, spacer 52 and buffer piece 53, forms annular groove between the one end that pedal push rod 31 is close to master cylinder ejector pin 32 and master cylinder ejector pin 32, and annular magnet steel 51 is equipped with a plurality ofly, and a plurality of annular magnet steel 51 interval cover are established in annular groove, are provided with spacer 52 between the adjacent annular magnet steel 51, are provided with buffer piece 53 between the annular magnet steel 51 at both ends and pedal push rod 31 and the master cylinder ejector pin 32.
It should be noted that: in this embodiment, the displacement sensor sensing chip 4 is a stationary fixing component, and is provided with a positioning device, and is fixed to the main casing 1 through a bolt, preferably, two annular magnetic steels 51 are provided, a spacer 52 is provided between two annular magnetic steels 51, buffer plates 53 are provided at positions where two ends of the annular magnetic steels 51 contact the pedal push rod 31 and the master cylinder push rod 32, the master cylinder push rod 32 is in threaded connection with the pedal push rod 31, and further the annular magnetic steels 51, the spacer 52 and the buffer plates 53 can be firmly fixed, so as to prevent the displacement of the annular magnetic steels 51, and the buffer plates 53 can play a role in vibration isolation and buffering. Wherein, annular magnet steel 51, spacer 52 and buffering piece 53 all can follow drive screw 621 and wear to establish the intracavity and freely slide, two annular magnet steel 51 are the N utmost point in relative one end magnetism the same, two annular magnet steel 51' S the other end is the S utmost point, spacer 52 and buffering piece 53 are the working of plastics of non-magnetic material, can guarantee like this that annular magnet steel 51 is all unique at the magnetic field direction of any position, thereby displacement sensor response chip 4 learns the displacement size of advancing and moving back of footboard input rod 3 through the direction of perception annular magnet steel 51 at different positions magnetic field line, through setting up displacement sensor response chip 4 and annular magnet steel 51 to non-contact, it is higher to compare in traditional contact gleitbretter resistance-type displacement sensor precision, the life-span is longer, anti-electromagnetic interference effect is better. The defects that the Hall induction type sensor is poor in interchangeability, signals change along with temperature, nonlinear output is achieved, and a single chip microcomputer is needed to be used for nonlinear and temperature correction are overcome; meanwhile, the defects that the time drift and the temperature drift are large when the sliding sheet resistance type displacement sensor is used, and real and effective data can not be obtained when the sliding sheet resistance type displacement sensor is measured for a long time can be overcome; the master cylinder top rod 32, the pedal top rod 31 and the transmission screw 621 are made of non-magnetic materials, such as stainless steel. In other embodiments, a plurality of annular magnetic steels 51 are arranged according to the arrangement mode of the annular magnetic steels 51 in this embodiment, so that the displacement sensor sensing chip 4 can measure a larger stroke, the specific number of the annular magnetic steels 51 can be specifically set according to actual requirements, and the number of the annular magnetic steels 51 is not specifically limited.
In the present embodiment, the pedal rod simulation device 7 includes a large spring 71, a small spring 72, a large spring seat 73, a small spring seat 74, a simulation rubber 75, and a simulator housing 76;
the simulator shell 76 is fixedly connected with one end of the main shell 1, which is provided with the pedal input rod 3, one end of the main shell 1, which is close to the simulator shell 76, is provided with a cylindrical extension section, the cylindrical extension section extends into the simulator shell 76, and the diameter of the cylindrical extension section is smaller than the diameter of the main body of the main shell 1;
the small spring seat 74 is sleeved outside the cylindrical extension section of the main shell 1 and is positioned in the simulator shell 76;
the small spring 72 is sleeved outside the cylindrical extension section of the main shell 1, one end of the small spring 72 is in contact with the end part of the main shell 1, and the other end of the small spring 72 is in contact with the small spring seat 74;
the large spring seat 73 is fixedly arranged on the pedal input rod 3 outside the main shell 1;
the large spring 71 is sleeved outside the pedal input rod 3, one end of the large spring 71 is in contact with the small spring seat 74, and the other end of the large spring 71 is in contact with the large spring seat 73;
the dummy rubber 75 is provided at an end of the large spring seat 73 close to the small spring seat 74, and the dummy rubber 75 can contact with the cylindrical extension of the main casing 1 after the large spring 71 and the small spring 72 are compressed to a predetermined length.
It should be noted that: the large spring 71 and the small spring 72 may be helical cylindrical springs or truncated conical helical springs, and the large spring 71 and the small spring 72 may be of equal pitch or variable pitch. The dummy rubber 75 acts when the large spring 71 and the small spring 72 are compressed to a certain limit, and simulates a pedal feel when the brake pedal is stepped on to a deep position, and the dust cover 10 is provided around the large spring 71, one end of the dust cover 10 is connected to the simulator housing 76, and the other end of the dust cover 10 is connected to the large spring seat 73.
Referring to fig. 8-9, a simulated curve of brake pedal force can be divided into three segments, the first segment is where the small spring 72 is active, and the idle stroke of the system is mainly eliminated when the simulated motor assist is not active. The second section is to simulate the relationship between the force of the brake pedal and the displacement of the brake pedal during normal power assistance when the motor power assistance just works, and the relationship is close to a linear relationship. When the boosting of the simulation motor in the third stage reaches the limit, the displacement of the brake pedal is very small, the force of the brake pedal is rapidly increased, the characteristic of the brake pedal is nonlinear, and the nonlinear characteristic of the simulation rubber 75 is utilized for simulation.
In this embodiment, the pedal input rod 3 is provided with an anti-rotation concave surface, and the position on the main housing 1 for the pedal input rod 3 to extend into is provided with an anti-rotation shaft sleeve, and the anti-rotation shaft sleeve has an anti-rotation convex surface adapted to the anti-rotation concave surface provided on the pedal input rod 3. Wherein, prevent changeing the axle sleeve and pass through the interference pressure equipment to main casing body 1 on, the material can be copper alloy powder metallurgy shaping, perhaps engineering wear resistant plastics, through be provided with on footboard input rod 3 and prevent changeing the concave surface, will prevent changeing to set to on the axle sleeve hole and prevent changeing the convex surface of preventing that the concave surface adaptation is changeed to the commentaries on classics, and then can prevent that footboard input rod 3 from taking place the rotation of circumferencial direction in the motion process to can guarantee displacement signal output's reliability.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A novel decoupling type electro-hydraulic brake system is characterized by comprising:
a main housing;
the hydraulic mechanism is connected with the main shell, and a brake master cylinder of the hydraulic mechanism extends into the main shell;
one end of the pedal input rod extends into the main shell from one end, far away from the hydraulic mechanism, of the main shell, and a gap exists between the end of the pedal input rod and a brake master cylinder of the hydraulic mechanism;
the displacement sensor sensing chip is arranged on the main shell;
the displacement sensor magnetic steel assembly is arranged on the pedal input rod and drives the displacement sensor magnetic steel assembly and the displacement sensor induction chip to generate relative displacement under the movement of the pedal input rod, so that the displacement sensor induction chip generates an electric signal;
the gear transmission device comprises a motor and a brake assembly, the brake assembly is sleeved on the pedal input rod, the motor is arranged on the main shell and is in transmission connection with the brake assembly, and the motor is electrically connected with the displacement sensor induction chip;
a pedal rod simulator disposed between the pedal input rod and the main housing outside the main housing.
2. The novel decoupled electro-hydraulic brake system of claim 1, wherein the brake assembly comprises:
the axis of the transmission screw is provided with a penetrating cavity penetrating the pedal input rod, and the outer wall of the transmission screw is provided with threads;
the guide bracket is provided with a guide hole and is connected with one end of the transmission screw rod;
the axis of the nut gear is provided with a threaded hole, the outer wall of the nut gear is provided with threads, the transmission screw rod penetrates through the threaded hole, the threads on the outer wall of the nut gear are in transmission connection with the motor through a transmission assembly, and one end of the nut gear is in rotational connection with the inner wall of the main shell through a bearing;
the guide rod, the guide rod with main casing body fixed connection, the guide rod wears to establish in the guiding hole.
3. The novel decoupled electro-hydraulic brake system of claim 2, wherein the transmission assembly comprises: the driving wheel is connected with an output shaft of the motor, and the idler wheel is meshed with the driving wheel and the threads on the outer wall of the nut gear respectively.
4. The novel decoupled electric-hydraulic brake system of claim 2, wherein a bushing is disposed in the pilot hole.
5. The novel decoupling type electro-hydraulic brake system as claimed in claim 2, wherein a master cylinder cushion block is arranged at one end of the guide support far away from the transmission screw rod, and a return spring is arranged between the master cylinder cushion block and a brake master cylinder of the hydraulic mechanism.
6. The novel decoupling type electro-hydraulic brake system according to claim 1, wherein the pedal input rod comprises a pedal push rod and a master cylinder push rod, and one end, far away from the hydraulic mechanism, of the master cylinder push rod is connected with the pedal push rod.
7. The novel decoupling type electro-hydraulic brake system according to claim 6, wherein the displacement sensor magnetic steel assembly comprises annular magnetic steel, a spacing piece and a buffer piece, an annular groove is formed between one end, close to the main cylinder ejector rod, of the pedal push rod and the main cylinder ejector rod, a plurality of annular magnetic steel are arranged, the annular magnetic steel is sleeved in the annular groove at intervals, the spacing piece is arranged between adjacent annular magnetic steel, and the buffer piece is arranged between the annular magnetic steel at two ends and the pedal push rod and the main cylinder ejector rod.
8. The novel decoupling type electro-hydraulic brake system as claimed in claim 1, wherein the pedal rod simulation device comprises a large spring, a small spring, a large spring seat, a small spring seat, a simulation rubber and a simulator housing;
the simulator shell is fixedly connected with one end, provided with the pedal input rod, of the main shell, one end, close to the simulator shell, of the main shell is provided with a cylindrical extension section, the cylindrical extension section extends into the simulator shell, and the diameter of the cylindrical extension section is smaller than the diameter of the main body of the main shell;
the small spring seat is sleeved outside the cylindrical extension section of the main shell and is positioned in the simulator shell;
the small spring is sleeved outside the cylindrical extension section of the main shell, one end of the small spring is contacted with the end part of the main shell, and the other end of the small spring is contacted with the small spring seat;
the large spring seat is fixedly arranged on the pedal input rod outside the main shell;
the large spring is sleeved outside the pedal input rod, one end of the large spring is in contact with the small spring seat, and the other end of the large spring is in contact with the large spring seat;
the simulation rubber is arranged at one end, close to the small spring seat, of the large spring seat, and can be in contact with the cylindrical extension section of the main shell after the large spring and the small spring are compressed to a certain preset length.
9. The novel decoupling type electro-hydraulic brake system according to claim 1, wherein an anti-rotation concave surface is arranged on the pedal input rod, an anti-rotation shaft sleeve is arranged at a position, into which the pedal input rod extends, on the main shell, and the anti-rotation shaft sleeve is provided with an anti-rotation convex surface matched with the anti-rotation concave surface arranged on the pedal input rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211286528.0A CN115431941A (en) | 2022-10-20 | 2022-10-20 | Novel decoupling type electro-hydraulic brake system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211286528.0A CN115431941A (en) | 2022-10-20 | 2022-10-20 | Novel decoupling type electro-hydraulic brake system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115431941A true CN115431941A (en) | 2022-12-06 |
Family
ID=84252936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211286528.0A Pending CN115431941A (en) | 2022-10-20 | 2022-10-20 | Novel decoupling type electro-hydraulic brake system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115431941A (en) |
-
2022
- 2022-10-20 CN CN202211286528.0A patent/CN115431941A/en active Pending
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