CN215663378U

CN215663378U - Rear axle control module with parking quick release valve structure

Info

Publication number: CN215663378U
Application number: CN202120416997.4U
Authority: CN
Inventors: 赵立城; 陈钢强; 俞碧君; 李少峰
Original assignee: Zhejiang VIE Science and Technology Co Ltd
Current assignee: Zhejiang VIE Science and Technology Co Ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2022-01-28
Anticipated expiration: 2031-02-25

Abstract

The utility model relates to the field of ABS electromagnetic valves, and discloses a rear axle control module with a parking quick release valve structure, wherein the quick release valve structure comprises a mounting seat, the mounting seat comprises a base and a second air inlet formed on the base, the base is fixedly connected with a lower valve body, a mounting cavity is formed between the inner side surface of the base and the lower valve body, a switch diaphragm is arranged in the mounting cavity, and a second air cavity is arranged around a first air cavity; the lower valve body is provided with a first air outlet and a second air outlet which are communicated with the parking cavity, the second air cavity is communicated with the first air outlet and the second air outlet, and the first air cavity is communicated with an air outlet arranged on the lower valve body. The valve body has the advantages of high integration degree, cost saving and the like.

Description

Rear axle control module with parking quick release valve structure

Technical Field

The utility model relates to the field of ABS electromagnetic valves, in particular to a rear axle control module with a parking quick release valve structure.

Background

The quick release valve is applied to the ABS of the automobile and is used for adjusting the ratio of input pressure to output pressure so as to reduce the braking air pressure of a front shaft when the braking deceleration is lower, prevent locking of a front wheel when braking, and improve the braking performance of the whole automobile. In the ABS system in the prior art, the quick release valve and the two ABS electromagnetic regulating valves are usually connected together through a nylon pipe, and the connection mode has the defects of increased air leakage risk, larger occupied space in the aspects of pipeline arrangement and installation and poorer convenience.

The applicant filed a chinese patent 201710939590.8 "integrated differential valve with ABS solenoid valve assembly" on 11/10/2017, which connects two air outlet channels with the left and right brake chambers of an automobile respectively, and controls the on-off of a pressure-reducing diaphragm mechanism and a pressure-maintaining diaphragm mechanism by using a pressure-reducing solenoid valve and a pressure-maintaining solenoid valve, so as to realize the control of a pressure-increasing process, a pressure-maintaining process and a pressure-reducing process, and meet the requirements of automobile brake control, and has the advantages of compact structure, fast response time, light weight, low cost, and the like.

But parking quick release valve and parking chamber gas outlet still let among the prior art adopt solitary spare part to design, still adopt nylon tube to connect and increased the gas leakage risk, so this application provides the rear axle control module who has parking quick release valve structure according to prior art's defect.

SUMMERY OF THE UTILITY MODEL

The utility model provides a rear axle control module with a parking quick release valve structure, aiming at the defects that the existing rear axle control module can not integrate a parking quick release valve and a parking cavity air outlet and the like.

In order to solve the technical problem, the utility model is solved by the following technical scheme:

the rear axle control module with the parking quick release valve structure comprises an upper valve body and a lower valve body, wherein a first air inlet, a control port and an ABS (anti-lock braking system) electromagnetic valve module are arranged on the upper valve body, a relay valve module is also arranged in the upper valve body, the first air inlet and the ABS electromagnetic valve module are communicated or disconnected with an air passage through the on-off state of the relay valve module, and compressed air at the control port is used for controlling the relay valve module to be opened or closed; the lower valve body is positioned at the lower side of the upper valve body, a quick release valve structure is mounted on the lower valve body and comprises a mounting seat, the mounting seat comprises a base and a second air inlet formed in the base, the base is fixedly connected with the lower valve body, a mounting cavity is formed between the inner side surface of the base and the lower valve body, a switch diaphragm is arranged in the mounting cavity, the end surface of the lower valve body in the mounting cavity is a mounting surface, a first air cavity and a second air cavity are formed in the mounting surface, and the second air cavity is arranged around the first air cavity; compressed air is input into the second air inlet, the switch diaphragm deforms towards the first air cavity to cut off the communication between the first air cavity and the second air cavity, and the second air inlet is communicated with the second air cavity; the second air inlet is disconnected from air inlet, the air compression time of the second air cavity is on the inner side of the switch diaphragm, the switch diaphragm deforms towards the direction of the second air inlet to cut off the communication between the second air inlet and the second air cavity, and the first air cavity is communicated with the second air cavity; the lower valve body is provided with a first air outlet and a second air outlet which are communicated with the parking cavity, the second air cavity is communicated with the first air outlet and the second air outlet, and the first air cavity is communicated with an air outlet arranged on the lower valve body.

Preferably, the mounting surface is provided with a sunken groove, the switch diaphragm is mounted in the sunken groove, and the first air cavity and the second air cavity are both arranged on the bottom surface of the sunken groove.

Preferably, the first air cavity is internally provided with a first sleeve body, one end of the first sleeve body is abutted against the middle part of the switch diaphragm, the second air inlet is internally provided with an air-permeable supporting sleeve frame, the middle part of the supporting sleeve frame is provided with a supporting block, and the supporting block is abutted against the other side surface of the middle part of the switch diaphragm.

Preferably, the inner side surface of the base is an arc-shaped surface, an annular convex ring is arranged on the arc-shaped surface, and a first air inlet valve port capable of controlling the second air cavity and the second air inlet to be switched on and off is formed between the convex ring and the switch diaphragm.

Preferably, an air-permeable abutting frame is formed on the inner side of the first sleeve body, the end part of the abutting frame abuts against the middle part of the switch diaphragm, and the annular edge of the end part of the first sleeve body, which is close to the second air inlet, and the switch diaphragm form a second air inlet valve port for controlling the on-off of the first air cavity and the second air cavity.

Preferably, the inner side surface of the base is provided with an annular groove, the sunken groove is positioned inside the annular groove, and a sealing gasket is assembled in the annular groove and sealed on the mounting surface around the sunken groove.

Preferably, a cavity is arranged in the upper valve body, the relay valve mechanism is arranged in the caliper body, a horizontal partition plate is arranged in the cavity, a first valve seat and a second valve seat are arranged in the middle of the partition plate, a through channel is arranged in the middle of each of the first valve seat and the second valve seat, the second valve seat is positioned on the inner side of the first valve seat, a valve assembly is arranged on the second valve seat, a limiting seat is arranged on the inner side of the first valve seat, a cavity A is formed by the outer wall of the first valve seat and the inner wall of the valve body, a third valve port is formed by the limiting seat and the upper end of the valve assembly, the third valve port controls the connection and disconnection of the first air inlet and the cavity A, the first relay valve structure comprises a piston, the piston is movably arranged above the first valve seat, a fourth valve port is formed by the lower end of the piston and the middle of the valve assembly, an air channel is arranged in the middle of the valve assembly, the air channel is communicated with the exhaust port, and the fourth valve port controls the connection and disconnection of the cavity A and the exhaust port, compressed air of the control port can act on the upper side of the piston to push the piston to move downwards to close the fourth valve port, and when the pressure of the air inlet is met, the valve assembly can be continuously pushed to open the third valve port by overcoming the resilience force of the valve assembly; and the cavity A is communicated with the ABS electromagnetic valve module.

Through the technical scheme, the utility model has the following technical effects:

compared with the prior art, the integrated module realizes lightweight design; the structure is compact; the response time is improved; the pipeline arrangement and installation are facilitated; the use of parts is saved, and the cost is greatly saved.

Drawings

Fig. 1 is a front view of the device.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a cross-sectional view of fig. 1.

Fig. 4 is an enlarged view of fig. 3.

Fig. 5 is a cross-sectional view of fig. 1.

The names of the parts indicated by the numerical references in the drawings are as follows: 1-upper valve body 1, 2-lower valve body 2, 3-exhaust port 3, 4-control port 4, 5-relay valve module 5, 6-quick release valve structure 6, 7-mounting seat 7, 8-base 8, 12-second inlet port 12, 10-mounting cavity 10, 11-first inlet port 11, 13-switch diaphragm 13, 14-mounting surface 14, 15-first air cavity 15, 16-second air cavity 16, 21-first outlet port 21, 22-second outlet port 22, 23-third outlet port 23, 24-fourth outlet port 24, 25-first sleeve body 25, 26-support sleeve frame 26, 27-support block 27, 28-convex ring 28, 29-first inlet valve port 29, 30-second inlet valve port 30, 31-interference frame 31, 32-sealing gasket 32, 33-partition 33, 34-first valve seat 34, 35-second valve seat 35, 36-valve assembly 36, 37-limiting seat 37, 38-A cavity 38, 39-piston 39, 40-third port 40, 41-fourth port 41, 42-channel A42, 43-channel B43, 44-cavity C44, 45-cavity E45, 46-membrane assembly 46, 47-cavity B47, 48-cavity D48, 49-channel C49, 50-channel D50, 51-solenoid valve module 51.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

The application relates to a rear axle control module with a parking quick release valve structure, which is an improvement on the prior patent CN2020211643104 and serial patents of the applicant. The rear axle control module can integrate the parking quick release valve function, integrates the pipeline design, saves the use of a pipeline, saves the space more and has higher response speed. The module comprises an upper valve body 1 and a lower valve body 2, wherein a first air inlet 11, a control port 4 and an ABS (anti-lock brake system) electromagnetic valve module 51 are arranged on the upper valve body 1, a relay valve module 5 is also arranged in the upper valve body 1, the first air inlet 11 and the ABS electromagnetic valve module 51 realize air passage connection or disconnection through the on-off state of the relay valve module 5, and compressed air at the control port 4 is used for controlling the relay valve module 5 to be opened or closed; the lower valve body 2 is positioned on the lower side of the upper valve body 1, the lower valve body 2 is provided with a quick release valve structure 6, the quick release valve structure 6 comprises a mounting seat 7, the mounting seat 7 comprises a base 8 and a second air inlet 12 formed on the base 8, the base 8 is fixedly connected with the lower valve body 2, a mounting cavity 10 is formed between the inner side surface of the base 8 and the lower valve body 2, a switch diaphragm 13 is arranged in the mounting cavity 10, the end surface of the lower valve body 2 in the mounting cavity 10 is a mounting surface 14, the mounting surface 14 is provided with a first air cavity 15 and a second air cavity 16, and the second air cavity 16 is arranged around the first air cavity 15; compressed air is input into the second air inlet 12, the switch diaphragm 13 deforms towards the direction of the first air cavity 15 to cut off the communication between the first air cavity 15 and the second air cavity 16, and the second air inlet 12 is communicated with the second air cavity 16; the second air inlet 12 is disconnected for air inlet, the air compression time of the second air cavity 16 is on the inner side of the switch diaphragm 13, the switch diaphragm 13 deforms towards the direction of the second air inlet 12 to cut off the communication between the second air inlet 12 and the second air cavity 16, and the first air cavity 15 is communicated with the second air cavity 16; the lower valve body 2 is provided with a first air outlet 21 and a second air outlet 22 which are communicated with the parking cavity, the second air cavity 16 is communicated with the first air outlet 21 and the second air outlet 22, and the first air cavity 15 is communicated with an air outlet 3 arranged on the lower valve body 2. In order to facilitate the pipeline arrangement and processing, the first air outlet 21 and the second air outlet 22 in the embodiment are located on the same axis and located on two sides of the mounting seat 7, and the axes of the first air outlet 21 and the second air outlet 22 are perpendicular to the axes of the first air cavity 15 and the second air cavity 16.

In this embodiment, a sink groove is formed in the mounting surface 14, the switch diaphragm 13 is installed in the sink groove, the first air cavity 15 and the second air cavity 16 are both formed in the bottom surface of the sink groove, and the edge of the switch diaphragm 13 abuts against the edge of the inner side surface of the base 8 and has a gap with the side wall of the sink groove.

In this embodiment, the first sleeve 25 is installed in the first air chamber 15, one end of the first sleeve 25 abuts against the middle of the switch diaphragm 13, and the air-permeable support sleeve frame 26 is installed in the second air inlet 12, that is, the support sleeve frame 26 is provided with a through structure, so that the compressed air that does not affect the second air inlet 12 reaches the switch diaphragm 13. The supporting block 27 is installed in the middle of the supporting sleeve frame 26, and the supporting block 27 abuts against the other side surface in the middle of the switch diaphragm 13. The middle part of the switch membrane 13 is clamped between the support and the price

In this embodiment, the inner side surface of the base 8 is an arc surface, an annular convex ring 28 is disposed on the arc surface, and a first air inlet valve port 29 capable of controlling the on-off of the second air cavity 16 and the second air inlet 12 is formed between the convex ring 28 and the switch diaphragm 13.

An air-permeable interference frame 31 is formed on the inner side of the first sleeve body 25, and specifically, the interference frame 31 is of a net structure. The end of the abutting frame 31 abuts against the middle of the switch diaphragm 13, and the annular edge of the end of the first sleeve 25 close to the second air inlet 12 and the switch diaphragm 13 form a second air inlet valve port 30 for controlling the on-off of the first air cavity 15 and the second air cavity 16.

In this embodiment, the inner side of the base 8 is provided with an annular groove, the sink groove is located inside the annular groove, the annular groove is provided with a sealing gasket 32, and the sealing gasket 32 is sealed on the mounting surface 14 around the sink groove.

The control process of the rear axle control module is as follows:

when the automobile is in a running state, compressed air from the air outlet of the manual valve enters from the second air inlet 12, the switch diaphragm 13 is pushed to move left, the first air inlet valve port 29 is opened, the second air inlet valve port 30 is closed, the second air inlet 12 is communicated with the second air cavity 16, the compressed air enters the air chamber of the spring brake cylinder through the first air outlet 21 and the second air outlet 22 respectively, and parking brake is released.

When the automobile is stopped and needs parking braking, the first air outlet 21 and the second air outlet 22 of the hand brake are pulled up, no air pressure is output any more, and compressed air in the second air inlet 12 is exhausted from the exhaust port 3 of the hand control valve. The switch diaphragm 13 moves to the right after receiving the air pressure of the second chamber of the parking air chamber, so that the first air inlet valve port 29 is closed, the second air inlet valve port 30 is opened, the second chamber is communicated with the first chamber, the compressed air in the parking air chamber is discharged, and the parking brake of the automobile is realized.

Example 2

The present embodiment introduces a relay valve structure based on embodiment 1, in which a cavity is disposed in an upper valve body 1, the relay valve mechanism is installed in a caliper body, a horizontal partition 33 is disposed in the cavity, a first valve seat 34 and a second valve seat 35 are disposed in the middle of the partition 33, through passages are disposed in the middle of the first valve seat 34 and the second valve seat 35, the second valve seat 35 is located inside the first valve seat 34, a valve assembly 36 is installed on the second valve seat 35, a stopper seat 37 is installed inside the first valve seat 34, an a cavity 38 is formed by the outer wall of the first valve seat 34 and the inner wall of the valve body, a third valve port 40 is formed by the upper ends of the stopper seat 37 and the valve assembly 36, the third valve port 40 controls opening and closing of the first air inlet 11 and the a cavity 38, the first relay valve structure includes a piston 39, the piston 39 is movably installed above the first valve seat 34, a fourth valve port 41 is formed by the lower end of the piston 39 and the middle of the valve assembly 36, the middle part of the valve assembly 36 is provided with an air channel which is communicated with the exhaust port 3, the fourth valve port 41 controls the on-off of the cavity A38 and the exhaust port 3, the compressed air of the control port 4 can act on the upper side of the piston 39 to push the piston 39 to move downwards to close the fourth valve port 41, and when the pressure of the air inlet is met, the valve assembly 36 can be continuously pushed to open the third valve port 40 by overcoming the resilience force of the valve assembly 36; the A chamber 38 communicates with the ABS solenoid valve module 51.

Example 3

The embodiment and the embodiment 2 are described as follows, wherein the control module describes a brake chamber boosting process, a pressure maintaining process and a pressure reducing process:

and (3) boosting: when the automobile is braked during running, the electromagnetic valves are not electrified, air pressure at an air outlet of the air brake valve enters from the control port 4 and pushes the piston 39 to move downwards, the air brake valve contacts with the valve assembly 36 to close the fourth valve port 41 and pushes the valve assembly 36 to move downwards to open the third valve port 40, compressed air from the first air inlet 11 enters the third valve port 40 and enters the cavity A38, the air pressure is divided into 4 paths, 2 paths of air pressure enter the cavity C44 and the cavity E45 to press the diaphragm assembly 46 through the channel A42 and the channel B43 and the internal channel of the integrated double-two-position three-way electromagnetic valve respectively, and in addition, 2 paths of air pressure open the diaphragm assembly 46 under the cavity B47 and the cavity D48 respectively and exhaust air from the third air outlet 23 and the fourth air outlet 24.

And (3) pressure maintaining process: when the automobile is braked during running, the electromagnetic valves are not electrified, air pressure at an air outlet of the air brake valve enters from the control port 4 and pushes the piston 39 to move downwards, the air brake valve contacts with the valve assembly 36 to close the fourth valve port 41 and pushes the valve assembly 36 to move downwards to open the third valve port 40, compressed air from the first air inlet 11 enters the third valve port 40 and enters the cavity A38, the air pressure is divided into 4 paths, 2 paths of air pressure enter the cavity C44 and the cavity E45 to press the diaphragm assembly 46 through the channel A42 and the channel B43 and the internal channel of the integrated double-two-position three-way electromagnetic valve respectively, and in addition, 2 paths of air pressure open the diaphragm assembly 46 under the cavity B47 and the cavity D48 respectively and exhaust air from the third air outlet 23 and the fourth air outlet 24. When the pressure maintaining electromagnetic valve is electrified: the air pressure of the passage A42 and the air pressure of the passage B43 enter the cavity B47 and the cavity D48 by opening the internal passages of the integrated double two-position three-way electromagnetic valve, and the diaphragm assembly 46 is pressed against 31 under the action of the air pressure and the conical spring, so that the air inlet is cut off, and the air pressure of the third air outlet 23 and the air pressure of the fourth air outlet 24 are kept unchanged.

And (3) decompression process: when the automobile is braked during running, the electromagnetic valves are not electrified, air pressure at an air outlet of the air brake valve enters from the control port 4 and pushes the piston 39 to move downwards, the air brake valve contacts with the valve assembly 36 to close the fourth valve port 41 and pushes the valve assembly 36 to move downwards to open the third valve port 40, compressed air from the first air inlet 11 enters the third valve port 40 and enters the cavity A38, the air pressure is divided into 4 paths, 2 paths of air pressure enter the cavity C44 and the cavity E45 to press the diaphragm assembly 46 through the channel A42 and the channel B43 and the internal channel of the integrated double-two-position three-way electromagnetic valve respectively, and in addition, 2 paths of air pressure open the diaphragm assembly 46 under the cavity B47 and the cavity D48 respectively and exhaust air from the third air outlet 23 and the fourth air outlet 24. When the pressure maintaining electromagnetic valve is electrified: the air pressure of the channel A42 and the air pressure of the channel B43 enter the cavity B47 and the cavity D48 by opening the internal channels of the integrated double-two-position three-way electromagnetic valve, and the diaphragm assembly 46 is pressed against 31 under the action of the air pressure and the conical spring, so that air inlet is cut off. The pressure reducing solenoid valve is electrified, the integrated double-two-position three-way solenoid valve channel is cut off, the air pressures of the C cavity 44 and the E cavity 45 are discharged from the exhaust channel through the C channel 49 and the D channel 50, the air pressures of the third air outlet 23 and the fourth air outlet 24 respectively push open the diaphragm assemblies 46 of the C cavity 44 and the E cavity 45, so that the air pressures of the third air outlet 23 and the fourth air outlet 24 are discharged from the exhaust channel, and the brake is released.

Claims

1. Rear axle control module with parking quick release valve structure, including last valve body (1) and lower valve body (2), its characterized in that: the air control valve is characterized in that a first air inlet (11), a control port (4) and an ABS (anti-lock brake system) electromagnetic valve module (51) are arranged on the upper valve body (1), a relay valve module (5) is further arranged in the upper valve body (1), the first air inlet (11) and the ABS electromagnetic valve module (51) are communicated or disconnected with an air passage through the on-off state of the relay valve module (5), and compressed air of the control port (4) is used for controlling the relay valve module (5) to be opened or closed; the lower valve body (2) is located on the lower side of the upper valve body (1), a quick release valve structure (6) is installed on the lower valve body (2), the quick release valve structure (6) comprises an installation seat (7), the installation seat (7) comprises a base (8) and a second air inlet (12) formed in the base (8), the base (8) is fixedly connected with the lower valve body (2), an installation cavity (10) is formed between the inner side surface of the base (8) and the lower valve body (2), a switch membrane (13) is arranged in the installation cavity (10), the end surface of the lower valve body (2) in the installation cavity (10) is an installation surface (14), a first air cavity (15) and a second air cavity (16) are formed in the installation surface (14), and the second air cavity (16) is arranged around the first air cavity (15); compressed air is input into the second air inlet (12), the switch diaphragm (13) deforms towards the direction of the first air cavity (15) to cut off the communication between the first air cavity (15) and the second air cavity (16), and the second air inlet (12) is communicated with the second air cavity (16); the second air inlet (12) is disconnected from air inlet, the air compression time of the second air cavity (16) is on the inner side of the switch diaphragm (13), the switch diaphragm (13) deforms towards the direction of the second air inlet (12) to cut off the communication between the second air inlet (12) and the second air cavity (16), and the first air cavity (15) is communicated with the second air cavity (16); the lower valve body (2) is provided with a first air outlet (21) and a second air outlet (22) which are communicated with the parking cavity, the second air cavity (16) is communicated with the first air outlet (21) and the second air outlet (22), and the first air cavity (15) is communicated with an air outlet (3) arranged on the lower valve body (2).

2. The rear axle control module with parking quick release valve structure of claim 1, characterized in that: a sinking groove is formed in the mounting surface (14), the switch diaphragm (13) is mounted in the sinking groove, and the first air cavity (15) and the second air cavity (16) are both formed in the bottom surface of the sinking groove.

3. The rear axle control module with parking quick release valve structure of claim 2, characterized in that: a first sleeve body (25) is installed in the first air cavity (15), one end of the first sleeve body (25) is abutted to the middle of the switch diaphragm (13), an air-permeable supporting sleeve frame (26) is arranged in the second air inlet (12), a supporting block (27) is installed in the middle of the supporting sleeve frame (26), and the supporting block (27) is abutted to the other side face of the middle of the switch diaphragm (13).

4. The rear axle control module with parking quick release valve structure of claim 1, characterized in that: the inner side surface of the base (8) is an arc-shaped surface, an annular convex ring (28) is arranged on the arc-shaped surface, and a first air inlet valve port (29) which can control the on-off of the second air cavity (16) and the second air inlet (12) is formed between the convex ring (28) and the switch diaphragm (13).

5. The rear axle control module with parking quick release valve structure of claim 3, characterized in that: an air-permeable abutting frame (31) is formed on the inner side of the first sleeve body (25), the end part of the abutting frame (31) abuts against the middle part of the switch diaphragm (13), and the annular edge of the end part of the first sleeve body (25) close to the second air inlet (12) and the switch diaphragm (13) form a second air inlet valve port (30) for controlling the on-off of the first air cavity (15) and the second air cavity (16).

6. The rear axle control module with parking quick release valve structure of claim 2, characterized in that: an annular groove is formed in the inner side face of the base (8), the sinking groove is located on the inner side of the annular groove, a sealing gasket (32) is assembled in the annular groove, and the sealing gasket (32) is sealed on the mounting surface (14) around the sinking groove.

7. The rear axle control module with parking quick release valve structure of claim 1, characterized in that: a cavity is arranged in the upper valve body (1), the relay valve mechanism is installed in the clamp body, a horizontal partition plate (33) is arranged in the cavity, a first valve seat (34) and a second valve seat (35) are arranged in the middle of the partition plate (33), penetrating channels are arranged in the middle of the first valve seat (34) and the middle of the second valve seat (35), the second valve seat (35) is located on the inner side of the first valve seat (34), a valve assembly (36) is installed on the second valve seat (35), a limiting seat (37) is installed on the inner side of the first valve seat (34), an A cavity (38) is formed by the outer wall of the first valve seat (34) and the inner wall of the valve body, a third valve port (40) is formed by the upper end of the limiting seat (37) and the upper end of the valve assembly (36), the third valve port (40) controls the connection and disconnection of the first air inlet (11) and the A cavity (38), the first relay valve structure comprises a piston (39), and the piston (39) is movably installed above the first valve seat (34), a fourth valve port (41) is formed between the lower end of the piston (39) and the middle part of the valve assembly (36), a gas path channel is arranged in the middle part of the valve assembly (36), the gas path channel is communicated with the exhaust port (3), the fourth valve port (41) controls the connection and disconnection of the cavity A (38) and the exhaust port (3), compressed air of the control port (4) can act on the upper side of the piston (39) to push the piston (39) to move downwards to close the fourth valve port (41), and when the pressure of the air inlet is met, the valve assembly (36) can be continuously pushed to open the third valve port (40) by overcoming the resilience force of the valve assembly (36); the cavity A (38) is communicated with the ABS electromagnetic valve module (51).