CN211519479U

CN211519479U - Input slider and electronic hydraulic braking system integrated with same

Info

Publication number: CN211519479U
Application number: CN201922013321.6U
Authority: CN
Inventors: 王鲜艳; 李传武; 杨业裕; 杨柳; 陈波; 李斌斌; 王新泽
Original assignee: Ruili Group Ruian Auto Parts Co Ltd
Current assignee: Wenzhou Ruili Kormee Automotive Electronics Co ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-09-18
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses an electronic hydraulic braking system of input slider and integrated input slider belongs to the car braking field. Specifically, an input slider (18) is disclosed, characterized in that it is used in an electro-hydraulic brake system and it has: a circular counter bore for mounting a feedback disc (20) at the middle part of one side, a circular ring shaped counter bore structure for mounting a force rod seat (21) at the one side, a middle circular through hole part for matching the pedal input shaft (10), and a supporting foot at the other side which is contacted with the end surface of a second input component which is different from the pedal input shaft (10). The utility model has the advantages of this input slider compact structure, safety, reliability are high, durable, processing is convenient.

Description

Input slider and electronic hydraulic braking system integrated with same

Technical Field

The utility model relates to an electronic hydraulic braking system of input slider and integrated input slider, concretely relates to automobile field's input slider and integrated input slider's electronic hydraulic braking system.

Background

With the continuous development and progress of the automobile industry technology, more and more automobiles develop towards electric, intelligent and clean. Most of the existing new energy automobiles adopt batteries, natural gas, batteries and gasoline or diesel oil to provide power for the new energy automobiles. Taking a pure electric vehicle as an example, the vehicle is driven by a motor, and a traditional engine is not used for providing a power source for a vacuum booster arranged on the vehicle. Although, the electronic vacuum pump in the prior art can provide a vacuum source for the electric vehicle. However, such an electronic vacuum pump cannot achieve regenerative braking, cannot provide precise control of braking force, and also cannot meet the braking demand of intelligent driving. Accordingly, electronic hydraulic brake boosters have evolved and are continually being developed to accommodate more complex driving scenarios.

The electrohydraulic brake EHB has been developed based on conventional hydraulic brakes. The control mechanism replaces the traditional hydraulic brake pedal with an electronic brake pedal, and cancels a bulky vacuum booster. In general, an electronic hydraulic brake device senses a pedal pressure of a driver by a sensor and then adjusts a brake pressure of each wheel by a hydraulic modulator in response to the pedal pressure of the driver.

At present, in an electronic hydraulic brake system, a transmission mechanism is relatively complex, the transmission mechanism is generally driven by a combination of a worm gear, a worm and a gear rack, the number of mechanism parts is large, the part processing requirement is high, the part equipment consistency is poor, and the occupied space is large.

For example, in chinese utility model patent application publication No. CN103754209A, ursolic et al discloses an electronic hydraulic brake system, which adopts dual motor input, has a pressure regulating transmission mechanism, a brake actuator and a control system, regulates hydraulic brake power and performs failure protection, and the transmission mechanism for pedal braking has a complex structure and is not easy to maintain.

For example, in chinese utility model patent application publication No. CN103481880A, sun meizhen discloses an electronic hydraulic brake device, which simplifies a hydraulic circuit and reduces the number of parts. However, the brake device is low in integration level, large in size, difficult to arrange in a front cavity of an automobile, low in universality and inconvenient to install.

For another example, in the chinese utility model patent application with publication No. CN106494379A, the brake booster includes an input rod that is driven by a brake pedal and moves forward in the axial direction and an assist pusher that converts the rotary driving motion of a motor into a linear motion, and a relative displacement detection device for measuring the relative stroke of the input rod and the assist pusher is provided between the input rod and the assist pusher. The utility model discloses a patent application is equipped with relative displacement detection device between input rod and helping hand pushing element, utilizes relative displacement detection device can detect out the relative displacement that input rod and helping hand pushed element in braking process for ECU control motor drive helping hand pushing element removes, has improved the accuracy. However, the response speed is slow, and the structure is not compact enough.

Further, in the chinese utility model patent application publication No. CN207089289U, shuqiang et al discloses an electronic hydraulic brake system, comprising: a housing; the main cylinder is connected with the shell; the output end of the motor is connected with the piston of the main cylinder through the main cylinder joint; the pedal push rod is connected with the brake pedal; one end of the main cylinder push rod is connected with the pedal push rod and slides along the axial direction of the shell along with the pedal push rod, and the other end of the main cylinder push rod is opposite to the main cylinder joint and is provided with a gap to form a decoupling structure; the pedal feeling simulation device is arranged outside the shell and is connected with the pedal push rod; and the displacement sensor is arranged in the shell. The utility model discloses an adopted traditional worm gear-rack and pinion's structure, processing installation accuracy is difficult for guaranteeing, and transmission noise is big, and wearing and tearing are big.

Accordingly, there remains a need in the art for an improved structural member for an electro-hydraulic brake device and an electro-hydraulic brake device for an automobile.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the applicant and other intensive researches provide an input slide block and an electronic hydraulic brake system integrated with the input slide block.

In particular, the present application provides an input slider, characterized in that it is used in an electro-hydraulic brake device and it has: a circular counterbore for mounting the feedback disc 20 at the middle portion of one side, a circular ring shaped counterbore structure for mounting the power rod seat 21 at the one side, a middle circular through hole portion for fitting the pedal input shaft 10, and a support foot at the other side in contact with an end surface of a second input member different from the pedal input shaft 10.

In one embodiment of the present application, the second input member is a ball screw 16.

In one technical scheme of the application, the electro-hydraulic brake system is integrated with a ball screw-worm gear assembly and a motor 27 to push a force assembly to push a brake master cylinder 1, the force assembly comprises the input slider 18, the feedback disc 20, the force rod seat 21, the force rod connecting shaft 22 and the force rod head 23 which are linked,

the ball screw 16 in the ball screw-worm gear assembly pushes the input slide block 18 to move, one side of the input slide block 18 is in contact with one side of the ball screw 16 but is not fixedly connected with the ball screw, and the output rod head 23 compresses the brake master cylinder 1 to build pressure.

In one embodiment of the present application, the input slider 18 further has two symmetrical threaded holes at the top for mounting the bracket of the displacement sensor chip 5.

The application also provides an electronic hydraulic brake system, its characterized in that:

having an input slider 18, said input slider 18 having: a circular counterbore for mounting the feedback disc 20 at the middle portion of one side, a circular ring shaped counterbore structure for mounting the power rod seat 21 at the one side, a middle circular through hole portion for fitting the pedal input shaft 10, and a support leg on the other side for contacting an end surface of a second input member different from the pedal input shaft 10.

the second input part is a ball screw 16 in the ball screw-worm gear assembly, the ball screw 16 pushes the input slide block 18 to move, one side of the input slide block 18 is in contact with one side of the ball screw 16 but is not fixedly connected with the ball screw, and the output rod head 23 compresses the brake master cylinder 1 to realize pressure build-up.

In one technical solution of the present application, the ball screw-worm gear assembly includes the ball screw 16, a ball screw nut 17 rotationally driving the ball screw 16 to translate, a worm gear 7 rotationally coupled with the ball screw nut 17, and a worm 25 engaged with the worm gear 7,

the center of the ball screw 16 is a hollow structure, the pedal input shaft 10 passes through the hollow structure and is guided by the guide structure of the hollow groove of the center of the ball screw 16,

the motor 27 transmits the worm 25 according to a signal of the control assembly, drives the ball screw 16 to move sequentially through the worm wheel 7 and the ball screw nut 17, and pushes the output assembly to compress the brake master cylinder 1 through the ball screw 16 to build pressure.

In one technical solution of the present application, the control assembly includes a controller 2, a magnet 4, and a displacement sensor chip 5; the controller 2 is used for receiving and processing signals of the displacement sensor chip 5, sending corresponding instructions to the motor 27 and controlling the motor 27 to rotate; the displacement sensor chip 5 is linked with the input sliding block 18, the magnet 4 is linked with the input shaft limiting metal plate 19, and the input shaft limiting metal plate 19 is linked with the pedal input shaft 10; and, there is certain distance between the spacing panel beating of input shaft 19 and the terminal surface of input slider 18 to guarantee:

at the moment of starting braking, when the magnet 4 and the input shaft limiting metal plate 19 are linked to one side, the displacement sensor chip 5 and the input sliding block 18 are in a static state, so that first relative displacement of the magnet 4 and the displacement sensor chip 5 is generated, and the displacement sensor chip 5 acquires a signal of the first relative displacement;

when the brake is released, the magnet 4 is driven by the input shaft limiting metal plate 19 to move towards the other side, the input sliding block 18 and the displacement sensor chip 5 are in a static state within a small distance of the initial movement of the magnet 4, so that second relative displacement of the magnet 4 and the displacement sensor chip 5 is generated, and the displacement sensor chip 5 acquires a signal of the second relative displacement.

In one embodiment of the present application, in the control assembly, the displacement sensor chip 5 is fixed on the upper portion of the input slider 18 of the output assembly through a bracket, so as to be linked with the input slider 18.

In one embodiment of the present application, the output assembly further includes a slider return spring 3, and when the ball screw 16 moves in a direction opposite to a direction of pushing the input slider 18, the input slider 18 is pushed back to an original position by a spring force of the slider return spring 3 compressed during braking and a reaction force of the master cylinder 1, instead of being brought back by the ball screw 16.

Compared with the prior art, the technical scheme of the utility model have following advantage: the input sliding block has the advantages of compact structure, safety, high reliability, durability and convenient processing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of an electro-hydraulic brake device according to the present invention;

fig. 2 is a sectional view a-a of the electro-hydraulic brake device of fig. 1.

Fig. 3 is a front view of the input slider 18 of the electro-hydraulic brake device of fig. 1 integrated with the input slider structure.

Fig. 4 is a side view of the input slider 18 in the electro-hydraulic brake device of the integrated input slider structure of fig. 1.

Fig. 5 is a block diagram of a power take-off assembly including an input slide 18, a feedback disk 20, a power take-off rod seat 21, a power take-off rod connecting shaft 22, and a power take-off rod head 23.

The reference numbers in the figures denote: 1, a brake master cylinder; 2, a controller; 3, a slide block return spring; 4, a magnet; 5, a displacement sensor chip; 6, a maintenance-free rolling bearing I; 7 a worm gear; 8 a front housing; 9a rear housing; 10 a pedal input shaft; 11 a push rod spring; 12 ball head push rods; 13 a push rod spring seat; 14 a metal locking nut; 15 a push rod fork; 16 ball screws; 17 ball screw nuts; 18 an input slider; 19 an input shaft limiting metal plate; 20 a feedback disc; 21 force rod seat; 22 output rod connecting shafts; 23 output club heads; 24 maintenance-free rolling bearing II; 25 of worm; 26 maintenance-free rolling bearing III; 27 motor.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. The embodiments in the present invention, other embodiments obtained by a person of ordinary skill in the art without creative work, all belong to the protection scope of the present invention.

Specifically, the functions of the components and the structures of the components of the electronic hydraulic brake device and the connection relationship therebetween will be described below with reference to fig. 1 and 2 of the drawings of the present invention:

main body assembly

As shown in fig. 1, the electro-hydraulic brake device of the present application includes a front housing 8, a rear housing 9, and a master cylinder 1 for built-up pressure braking. The master cylinder 1 may be a master cylinder commonly used in the art, and a detailed description thereof will be omitted. The master cylinder 1 may be fixed to one side of the front housing 8, for example, the left side of the front housing 8 in fig. 1, by bolts.

Input assembly

The electronic hydraulic brake device comprises an input assembly, the input assembly is connected with a brake pedal, and the input assembly comprises a pedal input shaft 10, an input shaft limiting metal plate 19, a ball head push rod 12 and a push rod fork 15. The input shaft stopper metal plate 19 is fixedly attached to one side of the pedal input shaft 10, which is the left side in the structure of fig. 1, for example, by a snap ring. The input shaft limiting metal plate 19 is used for limiting the pedal input shaft (10) from over returning, so that the position of the pedal input shaft (10) is consistent each time. And, the input shaft spacing panel beating (19) can be designed with the structure of preventing rotating, makes the magnet fixed on it only can follow the subassembly that footboard input shaft (10) constitutes and move back and forth, can not rotate.

The pedal input shaft 10, the input shaft limiting metal plate 19, the ball head push rod 12 and the push rod fork 15 form a linkage mechanism. The pedal input shaft 10 and the ball plunger 12 form a linkage, for example, by riveting. A push rod fork 15 is fixedly mounted to one side of the ball push rod 12, the right side in the structure of fig. 1, by, for example, a metal locknut 14, thereby forming a linkage mechanism.

Ball screw-worm gear assembly

As shown in fig. 1, the electro-hydraulic brake apparatus of the present application further includes a ball screw-worm gear assembly including a ball screw 16, a ball screw nut 17, a worm wheel 7, and a worm 25.

The ball screw nut 17 rotates to drive the ball screw 16 to move in a translational manner, and the ball screw 16 slides in the limiting groove of the front housing 8 through a pin structure pressed on the ball screw 16, so that the ball screw 16 can only move in a translational manner and cannot rotate.

The ball screw 16 has a hollow center through which the pedal input shaft 10 of the input assembly passes. In one embodiment, the pedal input shaft 10 is guided by the guide structure of the hollow groove of the core of the ball screw 16 and the guide structure of the rear housing 9, so that it can slide stably.

In one embodiment, the ball screw assembly may be mounted between the front housing 8 and the rear housing 9 by left and right press-fit maintenance-free rolling bearings I6. The front case 8 and the rear case 9 may be fixedly connected by, for example, bolts.

The worm wheel 7 may be, for example, press-fitted onto the outer race of the ball screw nut 17 and connected by, for example, a flat key, whereby the worm wheel 7 and the ball screw nut 17 form a linked structure and rotate together. The worm wheel 7 is intermeshed with the worm 25. The worm 25 rotates to drive the worm wheel 7 to rotate, so that the functions of speed reduction and torque increase are realized.

In one embodiment, as shown in fig. 2, the worm 25 is press-fitted with a maintenance-free rolling bearing II24 and a maintenance-free rolling bearing III26 at both ends thereof, and is mounted in the worm mounting groove of the rear housing 9 via these bearings.

Furthermore, the motor 27 and the worm 25 can be driven, for example, by a coupling. In one embodiment, the motor 27 is a brushless dc motor.

Force output assembly

As shown in fig. 1, the electrohydraulic brake assembly of the present application further includes a force assembly including an input slide 18, a feedback disc 20, a force rod seat 21, a force rod connecting shaft 22, and a force rod head 23, which are formed as a linked assembly, such as by riveting. The feedback disk 20 functions to feed back force to the pedal in equal proportion, thereby achieving a better pedal feel.

One end of a force assembly consisting of the input slide block 18, the feedback disc 20, the force rod seat 21, the force rod connecting shaft 22 and the force rod head 23, such as the rightmost input slide block 18, is in contact with one end of the ball screw 16, such as the output end surface on the left side, and the other end of the force assembly, such as the force rod head 23 on the left side, is in contact with the input piston of the brake master cylinder 1.

As shown in fig. 3 to 5, the input slider 18 of the present application has the following structure: the input slider 18 is a circular counterbore in the middle portion of one side, e.g., the left side, for mounting a feedback disk 20; the input slide block 18 is provided with a force rod seat 21 on one side, such as a circular ring-shaped counter bore structure on the left side; the middle circular through hole part is matched with the pedal input shaft 10; the input slider 18 has four supporting leg structures on the other side, for example, the right side, and the four supporting legs are in contact with the end face of the ball screw 16 to transmit the screw acting force; the upper part of the input slide block 18 is provided with two symmetrical threaded holes for mounting a bracket of the displacement sensor chip 5. The input slider 18 is assembled in the front case 8 and moves in a left-right sliding manner within the cavity of the front case 8.

In one embodiment, the output assembly further comprises a slider return spring 3, the slider return spring 3 being mounted between the master cylinder and the slider and acting as a spring force for returning the input slider 18 in case of a master cylinder failure, jamming and, in normal operation, as an auxiliary force for quick return of the input slider.

The ball screw 16 pushes the input slider 18 to move, and one side, for example, the right end surface of the input slider 18 is in contact with one side, for example, the left end surface of the ball screw 16, and is only in contact with but not fixedly connected to the ball screw. For example, when the ball screw 16 moves to the left, the input slider 18 is pushed to the left, and eventually the master cylinder 1 is compressed by the output rod 23 to build up pressure. However, when the ball screw 16 moves to the right, the input slider 18 is pushed back to the original position by the spring force of the slider return spring 3, which is compressed, for example, and the reaction force of the master cylinder 1 at the time of braking, rather than being brought back by the ball screw 16.

Control assembly

As shown in fig. 1, the electro-hydraulic brake device of the present application further includes a control assembly including a controller 2, a magnet 4, and a displacement sensor chip 5.

The displacement sensor chip 5 is fixed to the upper portion of the input slider 18 of the output unit by, for example, a bracket, and is interlocked with the input slider 18. The magnet 4 is fixedly attached to an upper portion of an input shaft stopper metal plate 19 of the input unit, for example, and forms an interlocking unit with the input shaft stopper metal plate 19.

There is certain distance between the terminal surface of the spacing panel beating of input shaft 19 and input slider 18, leave the clearance between the spacing panel beating of this input shaft 18 and this input shaft promptly, thereby can guarantee in the twinkling of an eye that begins to brake, drive magnet 4 linkage above when the spacing panel beating of this input shaft 19 moves to one side for example the left side, input slider 18 is in quiescent condition with the displacement sensor chip 5 that is fixed on it this moment, magnet 4 just has a relative displacement with displacement sensor chip 5 like this, displacement sensor chip 5 gathers relative displacement signal from this.

When the brake is released, the principle that the displacement sensor chip 5 acquires signals is the same, and relative displacement signals are acquired. When a driver releases the brake pedal to release the brake, the magnet 4 is driven by the input shaft limiting metal plate 19, the pedal input shaft 10, the ball head push rod 12 and the push rod fork 15 to move towards the other side, such as the right side, the input slide block 18 and the displacement sensor chip 5 are in a static state within a short distance of the initial movement of the magnet 4, so that the relative displacement between the magnet 4 and the displacement sensor chip 5 is generated, and the displacement sensor chip 5 acquires a relative displacement signal and sends the relative displacement signal to the controller 2. The controller 2 controls the motor 27 to rotate reversely through an algorithm, and drives the ball screw 16 to move towards the other side, such as the right side, sequentially through the worm 25, the worm wheel 7 and the ball screw nut 17.

The controller 2 is used for receiving the signal of the displacement sensor chip 5, processing the signal, and sending a corresponding instruction to the motor 27 to control the motor 27 to rotate. The displacement sensor chip 5 may be, for example, a hall displacement sensor chip. The controller 2 may be mounted to the front housing 8 by bolts, for example, to an upper portion of the front housing 8.

Pedal feedback assembly

In one embodiment, the electro-hydraulic brake apparatus of the present application further includes a pedal feedback assembly including a push rod spring seat 13 and a push rod spring 11. The push rod spring seat 13 is sleeved on the ball head push rod 12, and a push rod spring 11 is arranged between the rear shell 9 and the push rod spring seat 13, and mainly used for providing pedal feedback force.

The electronic hydraulic braking method of the present invention is explained below, and the electronic hydraulic braking method of the present invention includes the following steps:

step S1: the driver steps on the brake pedal, and pushes the push rod fork 15, the ball head push rod 12, the pedal input shaft 10, the input shaft limiting metal plate 19 and the magnet 4 which are connected with the brake pedal to move to one side, for example, to the left side.

Step S2: when the magnet 4 starts to move to one side, for example, to the left side from rest, the displacement sensor chip 5 is still in a rest state, at this time, the displacement sensor chip 5 and the magnet 4 have a certain relative displacement, the displacement sensor chip 5 sends a displacement signal to the controller 2, a control signal is output through arithmetic operation, and the motor 27 is controlled to start operation.

Step S3: the spindle of the motor 27 rotates to rotate the worm 25 connected thereto, the worm 25 rotates to rotate the worm wheel 7 engaged therewith, and the worm wheel 7 rotates to rotate the ball screw nut 17, so that the ball screw 16 moves to one side, for example, to the left.

Step S4: the ball screw 16 moves to one side, for example, the left side, and pushes the input slider 18 in contact with the ball screw to move to the same side, for example, the left side, the input slider 18 drives the feedback disk 20, the output rod seat 21, the output rod connecting shaft 22, and the output rod head 23 to move to the same side, and finally the output rod head 23 pushes the piston to the same side, for example, the left side to compress the brake master cylinder 1 to establish hydraulic pressure to realize braking.

Step S1-step S4 are performed in this order.

Step S5: when a driver releases the brake pedal to release the brake, the magnet 4 moves rightwards under the driving of the input shaft limiting metal plate 19, the pedal input shaft 10, the ball head push rod 12 and the push rod fork 15, the input slide block 18 is in a static state within a short distance of the initial movement of the magnet 4, and the displacement sensor chip 5 collects relative displacement signals and sends the signals to the controller 2. The controller 2 controls the motor 27 to rotate reversely through an algorithm, and drives the ball screw 16 to move to the other side, for example, the right side through the worm 25, the worm wheel 7 and the ball screw nut 17 in sequence. The input slide 18 returns to the initial position to the other side, for example, to the right side, under the combined action of, for example, the spring force of the slide return spring 3 and the hydraulic pressure of the master cylinder 1.

Step S: in addition, when the motor 27 or the controller 2 fails in an emergency, the driver steps on the brake pedal, and the brake pedal sequentially pushes the piston to compress the brake master cylinder 1 to establish hydraulic pressure to realize braking through the push rod fork 15, the ball push rod 12, the pedal input shaft 10 in the input assembly, and the feedback disc 20, the output rod seat 21, the output rod connecting shaft 22 and the output rod head 23 in the output assembly.

It is to be understood that the foregoing is by way of example only and is not intended as limiting the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. An input slide (18) for an electro-hydraulic brake system, and having: a circular counter bore for mounting a feedback disc (20) at the middle part of one side, a circular ring shaped counter bore structure for mounting a force rod seat (21) at the one side, a middle circular through hole part for matching the pedal input shaft (10), and a supporting foot at the other side which is contacted with the end surface of a second input component which is different from the pedal input shaft (10).

2. The input slider according to claim 1, characterised in that the second input member is a ball screw (16).

3. The input slider according to claim 1, characterized in that the electro-hydraulic brake system integrates a ball screw-worm gear assembly and a motor (27) to push a force assembly comprising the input slider (18), the feedback disc (20), the force lever seat (21), a force lever connecting shaft (22), and a force lever head (23) in linkage to push a master brake cylinder (1),

the ball screw (16) in the ball screw-worm gear assembly pushes the input sliding block (18) to move, one side of the input sliding block (18) is in contact with one side of the ball screw (16) but is not fixedly connected with the ball screw, and the brake master cylinder (1) is compressed through the output rod head (23) to build pressure.

4. Input slide according to claim 1, characterized in that the input slide (18) also has two symmetrical threaded holes in the upper part for mounting the holder of the displacement sensor chip (5).

5. An electronic hydraulic brake system integrated with an input slider, characterized in that:

it has an input slider (18), the input slider (18) having: a circular counter bore for mounting a feedback disc (20) at the middle part of one side, a circular ring shaped counter bore structure for mounting a force rod seat (21) at the one side, a middle circular through hole part for matching the pedal input shaft (10), and a supporting foot at the other side which is contacted with the end surface of a second input component which is different from the pedal input shaft (10).

6. The electro-hydraulic brake system of claim 5,

the brake master cylinder is integrated with a ball screw-worm gear assembly and a motor (27) to push a force assembly so as to push the brake master cylinder (1), the force assembly comprises the input sliding block (18), the feedback disc (20), the force rod seat (21), a force rod connecting shaft (22) and a force rod head (23) which are linked,

the second input component is a ball screw (16) in the ball screw-worm gear assembly, the ball screw (16) pushes the input sliding block (18) to move, one side of the input sliding block (18) is in contact with one side of the ball screw (16) but is not fixedly connected with the ball screw, and the output rod head (23) compresses the brake master cylinder (1) to build pressure.

7. The electro-hydraulic brake system of claim 6, wherein the ball screw-worm gear assembly includes the ball screw (16), a ball screw nut (17) that rotationally drives the ball screw (16) in translation, a worm gear (7) that rotates in conjunction with the ball screw nut (17), and a worm (25) that intermeshes with the worm gear (7),

the center of the ball screw (16) is a hollow structure, the pedal input shaft (10) passes through the hollow structure and is guided by the guide structure of the hollow groove of the center of the ball screw (16),

the motor (27) transmits the worm (25) according to a signal of the control assembly, drives the ball screw (16) to move sequentially through the worm wheel (7) and the ball screw nut (17), and pushes the force output assembly to compress the brake master cylinder (1) through the ball screw (16) to build pressure.

8. The electro-hydraulic brake system of claim 7, wherein the control assembly comprises a controller (2), a magnet (4) and a displacement sensor chip (5); the controller (2) is used for receiving and processing signals of the displacement sensor chip (5), sending corresponding instructions to the motor (27) and controlling the motor (27) to rotate; the displacement sensor chip (5) is linked with the input sliding block (18), the magnet (4) is linked with the input shaft limiting metal plate (19), and the input shaft limiting metal plate (19) is linked with the pedal input shaft (10); and, there is certain distance between the spacing panel beating of input shaft (19) and the terminal surface of input slider (18) to guarantee:

at the moment of starting braking, when the magnet (4) and the input shaft limiting metal plate (19) are linked to one side, the displacement sensor chip (5) and the input sliding block (18) are in a static state, so that first relative displacement of the magnet (4) and the displacement sensor chip (5) is generated, and the displacement sensor chip (5) acquires a signal of the first relative displacement;

when the brake is released, the magnet (4) is driven by the input shaft limiting metal plate (19) to move to the other side, the input sliding block (18) and the displacement sensor chip (5) are in a static state within a small distance of the initial movement of the magnet (4), so that second relative displacement of the magnet (4) and the displacement sensor chip (5) is generated, and the displacement sensor chip (5) acquires a signal of the second relative displacement.

9. The electro-hydraulic brake system according to claim 8, characterized in that in the control assembly, the displacement sensor chip (5) is fixed by a bracket on the upper part of the input slider (18) of the output assembly, so as to be interlocked with the input slider (18).

10. The electro-hydraulic brake system of claim 6, wherein the output assembly further comprises a slider return spring (3), and when the ball screw (16) moves in a direction opposite to a direction of pushing the input slider (18), the input slider (18) is pushed back to an original position by a spring force of the slider return spring (3) compressed at the time of braking and a reaction force of the master cylinder (1), instead of being brought back by the ball screw (16).