CN214355965U

CN214355965U - Electronic brake force intensifier

Info

Publication number: CN214355965U
Application number: CN202120398757.6U
Authority: CN
Inventors: 马李奕; 蔡忠侯; 祁雁英; 周庆任; 张滔; 段一戬; 钟志贤
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-10-08
Anticipated expiration: 2031-02-23

Abstract

The utility model provides an electronic braking force intensifier, which comprises a shell, a hydraulic cylinder and a thrust rod, wherein the hydraulic cylinder and the thrust rod are respectively arranged at the two ends of the shell; the main body part of the hydraulic cylinder is fixedly connected to the shell through a first guide rod and a second guide rod; one end of the thrust rod is positioned at the outer side of the shell, the other end of the thrust rod penetrates through the shell in a sliding manner, and the hollow motor, the hollow screw rod, the first supporting plate and the U-shaped plate are sequentially penetrated through the shell in a sliding manner; a second supporting plate is arranged on one side of the U-shaped opening of the U-shaped plate, and the U-shaped plate is slidably arranged in the shell through the second supporting plate; a top rod and a first return spring are arranged on the surface of one side, back to the U-shaped plate, of the second supporting plate; a magnet fixing frame and a second reset spring are arranged on the surface of one side, opposite to the U-shaped plate, of the second supporting plate; and the shell is also internally provided with a magnet, a sensor fixing plate and a PCB. The device can change the rotation motion of the motor into translation motion, and can also directly push the piston of the hydraulic cylinder under the condition that the motor does not work.

Description

Electronic brake force intensifier

Technical Field

The utility model relates to a motor vehicle arresting gear's braking force booster equipment technical field, in particular to electron braking force intensifier.

Background

In the field of automobile industry, the rapid development of new energy automobiles meets the social environmental protection requirements and simultaneously ensures the energy safety, and the new energy automobiles become the main force of the automobile market. However, the novel energy-saving power system and the electric vehicle cannot provide enough vacuum degree for the traditional vacuum brake booster, and can only be used as a vacuum power source by carrying a vacuum pump instead of an engine, so that the set of solution has obvious noise, occupies the space of a cabin and also increases the weight of the whole vehicle. If the electric power assistance is adopted, the following advantages are achieved:

1. the brake does not depend on a vacuum source, replaces the traditional vacuum pump and vacuum hose, has smaller volume and lighter weight in the whole braking process, and does not need to consume energy to establish the vacuum source. And meanwhile, the whole brake system has no altitude reaction.

2. The structure highly integrates, more is favorable to being used for the arrangement in space, and the helping hand ability is stronger.

3. The servo brake system consumes electric quantity only during braking, and particularly the power consumption of the whole vehicle required during emergency braking is lower.

Currently, a brake booster has been developed, and there are ibooster developed by bosch, MKC1 developed in land, EACT developed in hitachi, and the like currently used in the market. These brake force boosters each employ a structure such as a worm gear or a lead screw nut to convert the rotational motion of a motor into a linear translational motion to push a piston of a master cylinder. Therefore, the structure integration is not high, and the assembly is difficult.

Document CN102015397B discloses an electromechanical brake booster with a hollow spindle motor, the hollow rotor of which has a spindle nut that meshes with a hollow spindle. The spindle nut and the spindle form a spindle drive or generally a screw drive, which converts a rotary drive movement of an electric motor into a translatory output movement for actuating the hydraulic master brake cylinder. However, in this patent, the hollow spindle rotates with the hollow shaft motor and cannot convert the rotational movement of the motor into a linear translational movement, and the detection of the brake pedal displacement by the brake booster is not taken into account.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an electronic brake force booster having a lower manufacturing cost, a simpler transmission structure and a smaller volume, which allows a contactless measurement of the brake pedal displacement.

In order to achieve the above purpose, the utility model adopts the technical proposal that:

an electronic braking force enhancer comprises a shell, a hydraulic cylinder and a thrust rod, wherein the hydraulic cylinder and the thrust rod are respectively arranged at two ends of the shell; the piston end of the hydraulic cylinder is positioned in the shell, the main body part of the hydraulic cylinder is positioned outside the shell, and the main body part of the hydraulic cylinder is fixedly connected to the shell through a first guide rod and a second guide rod; the first guide rod and the second guide rod are respectively arranged on two opposite sides of the hydraulic cylinder and are arranged in parallel, the structures of the first guide rod and the second guide rod are the same, the first guide rod is fixed on the shell, one end of the first guide rod penetrates through the main body part of the hydraulic cylinder, the hydraulic cylinder is fixed on the shell through a nut, and the other end of the first guide rod is positioned in the shell;

one end of the thrust rod is positioned at the outer side of the shell, the other end of the thrust rod penetrates through the shell in a sliding manner, and a hollow motor, a hollow screw rod, a first supporting plate and a U-shaped plate are sequentially penetrated through the shell in a sliding manner; the hollow motor is fixed on the inner wall of the shell, a rotor of the hollow motor is in threaded connection with a hollow screw rod through an external thread structure of the hollow screw rod, and one end, facing the hydraulic cylinder, of the hollow screw rod is fixedly connected with a first supporting plate; one end of the first supporting plate is slidably arranged outside the first guide rod in a penetrating mode, and the other end of the first supporting plate is slidably arranged outside the second guide rod in a penetrating mode; the U-shaped opening of the U-shaped plate is arranged opposite to the first supporting plate, one side of the U-shaped opening of the U-shaped plate is provided with a second supporting plate, and the U-shaped plate is slidably arranged in the shell through the second supporting plate; one end of the second support plate is slidably arranged outside the first guide rod in a penetrating mode, and the other end of the second support plate is slidably arranged outside the second guide rod in a penetrating mode; a top rod and a first return spring are arranged on the surface of one side, back to the U-shaped plate, of the second supporting plate; one end of the ejector rod is fixedly connected with the second supporting plate, and the other end of the ejector rod is opposite to the piston end of the hydraulic cylinder and is connected with the piston of the hydraulic cylinder; one end of the first reset spring is abutted against the second support plate, the other end of the first reset spring is abutted against the inner wall of the shell, the elastic direction of the first reset spring is parallel to the moving direction of the piston of the hydraulic cylinder, and the first support plate is spaced from the piston end of the hydraulic cylinder in a natural state of the first reset spring; a magnet fixing frame and a second reset spring are arranged on the surface of one side, opposite to the U-shaped plate, of the second supporting plate, the magnet fixing frame is movably arranged in the U-shaped opening of the U-shaped plate through the second reset spring, the magnet fixing frame is fixedly sleeved on the thrust rod, and under the natural state of the second reset spring, a distance exists between the end part of one end, penetrating through the U-shaped plate, of the thrust rod and the second supporting plate, and the distance is larger than the distance between the first supporting plate and the piston end of the hydraulic cylinder under the natural state of the first reset spring;

the shell is internally provided with a magnet, a sensor fixing plate and a PCB; magnet is installed on the magnet fixed plate, and is located the outside of U template, sensor and magnet are located the same one side of magnet fixed plate, and both are in when the thrust rod wears to establish the one end tip contactless second backup pad of U template just to setting up, the sensor is installed on the sensor fixed plate, the sensor fixed plate is installed in the second backup pad, the PCB board is installed on the sensor fixed plate, and respectively with sensor, hollow motor and connector are connected, the connector is installed outside the casing, and it links to each other with the ECU controller of outside motor vehicle.

Preferably, the housing comprises a housing and a bottom plate, one end of the housing is provided with the hydraulic cylinder, the other end of the housing is open, the other end of the housing is sealed by the bottom plate, the bottom plate is detachably connected with the housing, and the hollow motor and the thrust rod are arranged on the bottom plate.

Preferably, a shell boss is arranged inside one end, provided with the hydraulic cylinder, of the shell, the shell boss surrounds the outer side of the piston end of the hydraulic cylinder, and the first reset spring is sleeved on the outer side of the shell boss.

Preferably, the first guide rod comprises a first section, a second section and a third section which are sequentially connected, the first section is located on the outer side of the shell, a threaded structure matched with the nut is arranged on the outer wall of the first section, the second section and the third section are located inside the shell, the diameter of the second section is larger than that of the first section and the third section, and the third section is a polished rod which penetrates through the first supporting plate and the second supporting plate in a sliding mode.

Preferably, the U-shaped plate is fixedly installed on the second supporting plate through a bolt and nut assembly, a first groove used for containing one end of the first reset spring and a second groove used for placing the fixed top plate are formed in the surface of one side, back to the U-shaped plate, of the second supporting plate, the first groove and the second groove are both located between the first guide rod and the second guide rod, and the second supporting plate is provided with the first guide rod and the second guide rod in a sliding penetrating mode through the through holes formed in the second supporting plate.

Preferably, the second support plate has a limiting boss facing one side of the U-shaped plate, and one end of the second return spring, which is not connected with the magnet fixing frame, is accommodated in the limiting boss.

Preferably, one end of the thrust rod, on which the magnet fixing frame is mounted, is provided with a clamping groove and a stepped boss, the clamping groove is detachably accommodated with a clamping spring, and the clamping spring and the stepped boss clamp and fix the magnet fixing frame together.

Preferably, the magnet fixing frame is connected with the U-shaped plate through a positioning pin, a stepped through hole is formed in the magnet fixing frame, and the positioning pin penetrates through the stepped through hole to be movably inserted into the positioning hole in the U-shaped plate.

Preferably, the sensor and the hollow motor are connected with a PCB through a plug board, and the plug board is installed on the PCB.

Preferably, the sensor is at a distance of 2-5mm from the magnet.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses a combination of cavity screw rod and cavity motor converts the rotary motion of cavity motor to translational motion's the output that is used for controlling braking system, has reduced the cost effectively, has simplified transmission structure, has reduced noise at work, has improved transmission efficiency.

2. The electronic brake force booster of the present invention can be used as a power assist generator for operating a motor vehicle brake device by means of a power assist (external force), i.e., without requiring the muscle force of a motor vehicle driver. In the event of failure of the power assist generator or its current supply or of the control/regulating mechanism, an auxiliary brake can always be implemented, which is an emergency brake in the event of failure of the power assist generator and is not to be confused with power assist braking, in which case a part of the operating force applied for the braking operation is applied by the muscle force (manual force) of the motor vehicle driver and the remaining part of the operating force is applied by the power assist generator.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 without the housing;

FIG. 3 is a cross-sectional view A-A of FIG. 1;

FIG. 4 is an exploded view of the electronic brake booster;

FIG. 5 is a view showing the structure of a guide bar;

FIG. 6 is a view of a second support plate;

FIG. 7 is a structural view of the second support plate in another direction;

FIG. 8 is a U-shaped plate structure view;

FIG. 9 is a view of the structure of the electromagnetic fixing plate;

fig. 10 is a three-dimensional view of a hollow screw.

Description of the main elements

In the figure: the device comprises a Y-shaped joint 1, a ball head connecting rod 2, a thrust rod 3, a stepped boss 31, a clamping groove 32, a fixing screw 4, a bottom plate 5, a hollow motor 6, a hollow screw 7, a first supporting plate 8, a U-shaped plate 9, a positioning hole 91, a second supporting plate 10, a through hole 101, a first groove 102, a second groove 103, a limiting boss 104, a first guide rod 11, a first section 111, a second section 112, a third section 113, a first reset spring 12, a nut 13, a hydraulic cylinder 14, a second guide rod 15, a top rod 16, a second reset spring 17, a magnet fixing frame 18, a stepped through hole 181, a snap spring 19, a shell 20, a shell boss 201, a connector 21, a positioning pin 22, a magnet 23, a sensor 24, a patch panel 25, a sensor fixing plate 26 and a PCB 27.

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

Referring to fig. 1-10, in a preferred embodiment of the present invention, an electronic brake force booster includes a housing, a hydraulic cylinder 14, and a thrust rod 2.

The two ends of the shell are respectively provided with a hydraulic cylinder 14 and a thrust rod 2; in this embodiment, the housing includes a housing 20 and a bottom plate 5, one end of the housing 20 is installed with the hydraulic cylinder 14, the other end is open, the other end is sealed by the bottom plate 5, the bottom plate 5 is detachably connected to the housing 20, the hollow motor 6 and the thrust rod 2 are installed on the bottom plate 5, specifically, the bottom plate 5 can be detachably installed on the housing 20 by using a screw structure, and the detachable installation mode is convenient for checking the condition inside the housing 20. The housing is mounted in use on a motor vehicle by means of set screws 44.

The piston end of the hydraulic cylinder 14 is positioned in the shell, the main body part of the hydraulic cylinder 14 is positioned outside the shell, and the main body part of the hydraulic cylinder 14 is fixedly connected to the shell through a first guide rod 11 and a second guide rod 15; the first guide rod 11 and the second guide rod 15 are respectively arranged on two opposite sides of the hydraulic cylinder 14 and are arranged in parallel, the structures of the first guide rod 11 and the second guide rod are the same, the first guide rod 11 is fixed on the shell, one end of the first guide rod is penetrated through the main body part of the hydraulic cylinder 14, the hydraulic cylinder 14 is fixed on the shell through a nut 13, and the other end of the first guide rod 11 is positioned in the shell; specifically, in this embodiment, the first guide rod 11 includes a first section 111, a second section 112, and a third section 113 that are sequentially connected, the first section 111 is located outside the housing, and the outer wall of the first section 111 is provided with a threaded structure that matches the nut 13, that is, after the first section 111 penetrates through the main body of the hydraulic cylinder 14, the first section is locked by the nut 13, and the second section 112 is matched with the first section 111, so that the hydraulic cylinder 14 is clamped and fixed on the housing, and meanwhile, the first guide rod 11 can also be fixed on the housing, the second section 112 and the third section 113 are located inside the housing, the diameter of the second section 112 is larger than the diameter of the first section 111 and the diameter of the third section 113, the third section 113 is a polish rod, and is slidably penetrated through the first support plate 8 and the second support plate 10, the diameter of the second section 112 is larger than the diameter of the third section 113, so that the maximum boosting stroke of the first support plate 8 and the second support plate 10 can be limited.

One end of the thrust rod 2 is located on the outer side of the shell, the other end of the thrust rod penetrates through the shell in a sliding mode, and the hollow motor 6, the hollow screw 7, the first supporting plate 8 and the U-shaped plate 9 are sequentially penetrated through the shell in a sliding mode. The hollow motor 6 is fixed on the inner wall of the shell, a rotor of the hollow motor is in threaded connection with the hollow screw 7 through an external thread structure of the hollow screw 7, and one end, facing the hydraulic cylinder 14, of the hollow screw 7 is fixedly connected with the first supporting plate 8; one end of the first supporting plate 8 is slidably arranged outside the first guide rod 11 in a penetrating mode, and the other end of the first supporting plate is slidably arranged outside the second guide rod 15 in a penetrating mode. U-shaped opening of U template 9 sets up to first backup pad 8 dorsad, U-shaped opening one side of U template 9 sets up second backup pad 10, U template 9 passes through second backup pad 10 slidable mounting inside the casing, and is concrete, U template 9 passes through bolt and nut 13 subassembly fixed mounting on second backup pad 10. One end of the second support plate 10 is slidably arranged outside the first guide rod 11, and the other end of the second support plate is slidably arranged outside the second guide rod 15; in this embodiment, a first groove 102 and a second groove 103 are formed in a side plate surface of the second support plate 10 facing away from the U-shaped plate 9, the first groove 102 and the second groove 103 are both located between the first guide rod 11 and the second guide rod 15, and the first guide rod 11 and the second guide rod 15 are slidably inserted through the through hole 101 formed in the second support plate 10; a top rod 16 and a first return spring 12 are arranged on one side plate surface of the second supporting plate 10, which is back to the U-shaped plate 9; one end of the ejector rod 16 is fixedly connected with the second support plate 10, and is specifically fixed on the second support plate 10 by being placed in the second groove 103, and the other end of the ejector rod 16 is opposite to the piston end of the hydraulic cylinder 14 and is connected with the piston of the hydraulic cylinder 14; the one end butt second backup pad 10 of first reset spring 12, specific butt holding is in first groove 102, the other end butt the inner wall of casing, preferably, the casing sets up the inside casing boss 201 that is provided with of one end of pneumatic cylinder 14, casing boss 201 encircles the outside at pneumatic cylinder 14 piston end, the outside at casing boss 201 is established to the other pot head of first reset spring 12, the elasticity direction of first reset spring 12 is on a parallel with the direction of activity of pneumatic cylinder 14 piston, under the first reset spring 12 natural state, there is the interval in the piston end of first backup pad 8 and pneumatic cylinder 14. Second backup pad 10 just is provided with magnet mount 18 and second reset spring to one side face of U template 9, magnet mount 18 sets up in the U-shaped mouth of U template 9 through the activity of second reset spring, the fixed cover of magnet mount 18 is established on thrust rod 2, under the second reset spring natural state, thrust rod 2 wears to establish one end tip and the second backup pad 10 of U template 9 and has the interval, and this interval is greater than interval between the piston end of first backup pad 8 and pneumatic cylinder 14 under the first reset spring 12 natural state. Preferably, one end of the thrust rod 2, which is provided with the magnet fixing frame 18, is provided with a clamping groove 32 and a stepped boss 31, the clamping groove 32 is detachably accommodated with a clamping spring 19, and the clamping spring 19 and the stepped boss 31 clamp and fix the magnet fixing frame 18 together; the magnet fixing frame 18 is connected with the U-shaped plate 9 through a positioning pin 22, a stepped through hole 181 is formed in the magnet fixing frame 18, the positioning pin 22 penetrates through the magnet fixing frame 18 through the stepped through hole 181 and is movably inserted into a positioning hole 91 in the U-shaped plate 9, namely, the positioning pin 22 is in clearance fit with the positioning hole 91, the positioning pin 22 can slide in the positioning hole 91 and plays a role in guiding, and the magnet fixing frame 18 can only move relative to the U-shaped plate 9 along the thrust direction without rotating under the action of the thrust rod 3; the second support plate 10 is provided with a limit boss 104 on the side opposite to the U-shaped plate 9, and one end of the second return spring not connected with the magnet fixing frame 18 is accommodated in the limit boss 104.

The shell is also internally provided with a magnet 23, a sensor fixing plate 26 and a PCB 27; magnet 23 installs on magnet 23 fixed plate, and is located the outside of U type board 9, sensor 23 and magnet 23 are located the same one side of magnet 23 fixed plate, and both are in when thrust rod 2 wears to establish the one end tip of U type board 9 and does not contact second backup pad 10 just to setting up, sensor 23 installs on sensor fixed plate 26, sensor fixed plate 26 installs on second backup pad 10, PCB board 27 installs on sensor fixed plate 26, and respectively with sensor 23, hollow motor 6 and connector 21 are connected, connector 21 installs outside the casing, and it links to each other with the ECU controller (not shown) of outside motor vehicle. Preferably, the sensor 23 and the hollow motor 6 are connected with a PCB 27 through a plug board 25, and the plug board 25 is mounted on the PCB 27; the distance between the sensor 23 and the magnet 23 is 2-5 mm; the sensor fixing plate 26 is L-shaped; the connector 21 is provided at an end of the housing 20 where the hydraulic cylinder 14 is provided.

In the present invention, the end of the thrust rod 2 located outside the housing is used for connecting a brake pedal, thereby mechanically connecting the brake pedal with the piston of the hydraulic cylinder 14, and transmitting the muscle force (manual force) applied through the brake pedal (not shown) to the piston of the hydraulic cylinder 14. The thrust rod 2 of the electronic brake force booster according to the present invention may introduce a muscle force by a parking brake lever (hand brake lever) or other manipulation member, in addition to a brake pedal. In the present embodiment, a structure in which the thrust rod 2 is connected to the brake pedal is given, such as a Y-joint 1 and a ball joint lever 2 shown in fig. 3, wherein the Y-joint 1 is used for connecting the brake pedal.

In the present invention, the hollow screw 7 and the first support plate 8 form a rotation/translation conversion transmission mechanism, which converts the rotation driving motion of the hollow motor 6 into the translation motion for the braking operation, specifically, the hollow screw 7 is rotated by the rotation driving of the hollow motor 6, the hollow screw 7 is fixed on the first support plate 8, the first support plate 8 is sleeved on the first guide rod 11 and the second guide rod 15, the first support plate 8 is limited by the first guide rod 11 and the second guide rod 15 and can only slide along the first guide rod 11 and the second guide rod 15, thus, the first support plate 8 converts the rotation motion into the translation motion, and transmits the translation motion to the U-shaped plate 9 by pushing the U-shaped plate 9 by the butt, the U-shaped plate 9 transmits the translation motion to the second support plate 10, the second support plate 10 transmits the translation motion to the ejector rod 16, ram 16 pushes on the piston of hydraulic cylinder 14, which converts the rotary drive motion of the motor into a translational motion.

Muscle force (manpower) applied by a brake pedal (not shown) drives the thrust rod 2 to overcome the elastic force of the second return spring to drive the magnet 23 to move along the axial direction of the thrust rod 2, and the sensor 23 detects the relative position of the thrust rod 3 and the U-shaped plate 9, namely whether the thrust rod 3 moves or not, and during detection, the movement distance of the magnet 23 is detected. When the thrust rod 3 has displacement, the sensor 23 transmits displacement information to the connector 21 through the PCB 27, the connector 21 is transmitted to an ECU controller of the motor vehicle, the ECU controller sends out a control instruction, the control instruction is transmitted to the PCB 27 through the connector 21, the PCB 27 drives the hollow motor 6 to rotate, the hollow screw 7 is driven to do linear motion, the linear motion of the hollow screw 7 can act on the U-shaped plate 9, the hydraulic cylinder 14 is driven to run through the ejector rod 16, and therefore brake assistance is achieved. However, if the movement of the magnet 23 exceeds the detection range of the sensor 23 and the hollow motor 6 is not operated, the thrust rod 2 drives the U-shaped plate 9 and one end of the second supporting plate 10 under the action of muscle force, the second supporting plate 10 pushes the ejector rod 16 to drive the piston of the hydraulic cylinder 14 to operate, and thus the thrust rod 2 pushes the piston of the hydraulic cylinder 14 directly without the assistance of the motor.

In addition, it should be noted that, in the present invention, the first return spring 12 is mainly used to mechanically return the brake booster formed by the second support plate 10 to the thrust rod 2 when the muscle force acting on the brake pedal can be removed by the parking brake lever (hand brake lever) or other control member; the installation pretightening force of the first return spring 12 is larger than that of the second return spring, and the second return spring is mainly used for resetting the position of the thrust rod 2.

The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.

Claims

1. An electronic braking force intensifier comprises a shell, a hydraulic cylinder and a thrust rod, and is characterized in that: a hydraulic cylinder and a thrust rod are respectively arranged at two ends of the shell; the piston end of the hydraulic cylinder is positioned in the shell, the main body part of the hydraulic cylinder is positioned outside the shell, and the main body part of the hydraulic cylinder is fixedly connected to the shell through a first guide rod and a second guide rod; the first guide rod and the second guide rod are respectively arranged on two opposite sides of the hydraulic cylinder and are arranged in parallel, the structures of the first guide rod and the second guide rod are the same, the first guide rod is fixed on the shell, one end of the first guide rod penetrates through the main body part of the hydraulic cylinder, the hydraulic cylinder is fixed on the shell through a nut, and the other end of the first guide rod is positioned in the shell;

2. An electronic brake booster as claimed in claim 1, wherein: the shell comprises a shell and a bottom plate, one end of the shell is provided with a hydraulic cylinder, the other end of the shell is open, the other end of the shell is sealed through the bottom plate, the bottom plate is detachably connected with the shell, and the hollow motor and the thrust rod are arranged on the bottom plate.

3. An electronic brake booster as claimed in claim 1, wherein: the casing sets up the inside casing boss that is provided with of one end of pneumatic cylinder, the casing boss encircles the outside at the pneumatic cylinder piston end, first reset spring cover is established in the outside of casing boss.

4. An electronic brake booster as claimed in claim 1, wherein: the first guide rod comprises a first section, a second section and a third section which are sequentially connected, the first section is located on the outer side of the shell, a threaded structure matched with the nut is arranged on the outer wall of the first section, the second section and the third section are located inside the shell, the diameter of the second section is larger than that of the first section and the third section, and the third section is a polished rod and penetrates through the first supporting plate and the second supporting plate in a sliding mode.

5. An electronic brake booster as claimed in claim 1, wherein: the U-shaped plate is fixedly installed on the second supporting plate through the bolt and nut assembly, a first groove used for containing one end of the first reset spring and a second groove used for placing the fixed top plate are formed in one side plate surface of the second supporting plate, which faces away from the U-shaped plate, the first groove and the second groove are both located between the first guide rod and the second guide rod, and the second supporting plate is provided with the first guide rod and the second guide rod through the through holes formed in the second supporting plate in a sliding penetrating mode.

6. An electronic brake booster as claimed in claim 1, wherein: the second supporting plate is provided with a limiting boss right facing one side of the U-shaped plate, and one end, not connected with the magnet fixing frame, of the second reset spring is accommodated in the limiting boss.

7. An electronic brake booster as claimed in claim 1, wherein: the end of the thrust rod provided with the magnet fixing frame is provided with a clamping groove and a stepped boss, a clamping spring is detachably accommodated in the clamping groove, and the clamping spring and the stepped boss clamp and fix the magnet fixing frame together.

8. An electronic brake booster as claimed in claim 1, wherein: the magnet fixing frame is connected with the U-shaped plate through a positioning pin, a step through hole is formed in the magnet fixing frame, the positioning pin penetrates through the step through hole to be arranged in the positioning hole in the U-shaped plate in a penetrating mode, and the positioning pin is movably inserted into the positioning hole in the U-shaped plate.

9. An electronic brake booster as claimed in claim 1, wherein: the sensor and the hollow motor are connected with the PCB through the plugboard, and the plugboard is installed on the PCB.

10. An electronic brake booster as claimed in claim 1, wherein: the distance between the sensor and the magnet is 2-5 mm.