CN210830692U

CN210830692U - Brake valve

Info

Publication number: CN210830692U
Application number: CN201921772046.XU
Authority: CN
Inventors: 王汉峰
Original assignee: Individual
Current assignee: Shandong Anshun Brake System Co ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-06-23
Anticipated expiration: 2029-10-22

Abstract

The utility model discloses a valve body, a first piston, a second piston, a valve body, a retainer ring and a valve reset piece; the valve body is internally provided with a separating part which separates the valve body cavity into an air storage cavity and an external cavity; the partition part is provided with a valve hole; the check ring is arranged in the outer cavity and provided with a through hole; the second piston comprises a piston body, a baffle ring and a pushing part; the baffle ring slides along the hole wall of the through hole and is matched with the piston body to block the through hole; the pushing part is arranged to push the valve body to move in a direction away from the valve hole; the valve reset piece is arranged to drive the valve body to move towards the direction close to the valve hole; the first piston slides along the inner side wall of the upper chamber, and the area of the cross section of the first piston is not consistent with the area of the cross section of the second piston. The utility model discloses a set up the piston that two big small areas are different in order to realize adjusting the efficiency of opening of valve body, easy operation convenient to use satisfies diversified demand.

Description

Brake valve

Technical Field

The utility model relates to a brake braking field, especially a brake valve.

Background

The brake system is the most important part for ensuring the safe running of the vehicle, and the brake valve is the main control device in the service brake system of the automobile. The normal work of the brake valve has important significance for parking, and provides technical support for smooth braking of the automobile.

The working principle of the brake valve is that a piston drives a piston push rod to push a valve of the air valve to be opened, so that air enters a brake air chamber to generate braking. The prior art brake valve can only provide one state of braking force, i.e. the efficiency of opening of the valve is certain. However, in actual use, the requirements on the brake valve are various, for example, a certain gentle brake valve may be needed in a light load state, but when the vehicle is in a loaded state or on a hill, strong braking is often needed at this time, and if the valve is opened slowly, the air pressure entering the brake air chamber is insufficient to influence the braking effect. It is apparent that the prior art brake valve is difficult to satisfy the diversified demands.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a brake valve to solve not enough among the prior art, it can satisfy diversified demand through setting up the efficiency of opening of two different pistons of big small and big area in order to realize adjusting valve body, is convenient for adjust brake braking state.

The utility model provides a brake valve, which comprises a valve body, a first piston, a second piston, a valve body, a retainer ring and a valve reset piece;

the valve body is internally provided with a partition part which divides a valve body cavity in the valve body into an air storage cavity and an external cavity; the partition part is provided with a valve hole for communicating the air storage cavity with the external cavity;

the check ring is arranged in the external cavity and divides the external cavity into an upper chamber and a brake chamber, and a through hole for communicating the upper chamber with the brake chamber is formed in the check ring;

the second piston comprises a piston body sliding along the inner side wall of the upper chamber, a baffle ring arranged on the piston body and a pushing part opposite to the valve body; the baffle ring slides along the hole wall of the through hole and is matched with the piston body to seal the through hole; the pushing part is arranged to push the valve body to move in a direction away from the valve hole;

the valve resetting piece is arranged to drive the valve body to move towards the direction close to the valve hole;

the first piston slides along the inner side wall of the upper chamber, the first piston opens the valve body by pushing the second piston, and the area of the cross section of the first piston is not consistent with the area of the cross section of the second piston.

A brake valve as described above, wherein preferably the cross-sectional area of said first piston is smaller than the cross-sectional area of said second piston.

In the brake valve according to the above, preferably, the first piston is provided with a guide post extending in a direction toward the second piston, and the second piston is provided with a first guide groove adapted to the guide post.

In the brake valve according to the above, preferably, the guide post is provided with a second guide groove, and the upper cover is provided with an upper cover guide post adapted to the second guide groove.

A brake valve as described above, wherein the brake valve further comprises a pressure adjusting means for adjusting the pressure of the air acting on the second piston in a region outside the retainer ring.

The brake valve as described above, wherein, preferably, the valve body includes a body, a blocking portion disposed on an outer sidewall of the body along a circumferential direction of the body, and a bearing portion fixedly connected to the body for receiving an urging force of the urging portion; the bearing part penetrates through the valve hole and extends towards the direction of the second piston;

the partition part is provided with a shoulder part matched with the blocking part.

In the brake valve according to the above, it is preferable that a first seal is provided at a position on the carrier portion opposite to the push portion, and a second seal is provided at a position on the blocking portion opposite to the shoulder portion.

In the brake valve according to the above, it is preferable that the partition portion is further provided with a stopper for limiting a downward stroke of the second piston, and the stopper is fixed to the shoulder portion and extends in a direction in which the second piston is located.

A brake valve as described above, wherein, preferably, said brake valve further comprises a valve seat disposed in said air chamber, said valve seat comprising a fixed plate fixed to said valve body, a through hole disposed on said fixed plate, and a retainer ring disposed on said fixed plate along an edge position of said through hole;

and a sealing ring is arranged between the valve body and the inner side wall of the limit ring, and the valve body slides along the inner side wall of the limit ring.

Preferably, the valve return element is a spring sleeved outside the body limiting ring, a first end of the spring abuts against the fixed plate, and a second end of the spring abuts against the valve body.

Compared with the prior art, the utility model discloses a set up the efficiency of opening of two different pistons of big small and big area in order to realize adjusting valve body, promote opening of valve body through the big piston of area when needs powerful braking, promote opening of valve body through the piston that the area is little when needs moderate braking. The switching of above-mentioned state only needs to be connected the control mouth on the pneumatic tube that comes the brake pedal braking master cylinder and the different drive chambeies and can realize, and easy operation convenient to use satisfies diversified demand, is convenient for adjust the brake braking state.

Drawings

Fig. 1 is a schematic view of the internal structure of the brake valve disclosed by the present invention in an inoperative state;

fig. 2 is a schematic view of the internal structure of the brake valve disclosed by the present invention in a strong braking state;

fig. 3 is a schematic view of the internal structure of the brake valve disclosed by the invention in a medium braking state;

description of reference numerals: 1-valve body, 11-partition, 110-valve hole, 111-shoulder, 112-limit piece, 12-reservoir, 13-brake, 14-first drive, 15-second drive, 16-upper cover, 161-upper cover guide post, 17-retainer boss, 18-outlet, 19-first control port, 20-second control port,

2-first piston, 21-guide post, 211-second guide groove,

3-second piston, 31-piston body, 311-air pressure pushing area, 312-air pressure isolating area, 32-isolating ring, 33-pushing portion, 34-first guide groove,

4-valve body, 41-body, 42-plugging portion, 421-first sealing element, 43-bearing portion, 431-second sealing element,

5-check ring, 51-perforation, 6-valve reset piece, 7-valve seat, 71-fixing plate, 72-perforation, 73-limit ring and 8-buffer cavity.

Detailed Description

The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The embodiment of the utility model provides a: as shown in fig. 1 to 3, a brake valve is disclosed, which comprises a valve body 1, a first piston 2, a second piston 3, a valve body 4, a retainer ring 5 and a valve restoring member 6;

the valve body 1 is internally provided with a partition part 11 which divides a valve body cavity inside the valve body 1 into an air storage cavity 12 and an external cavity. The valve body 1 is provided inside with a valve body cavity, and a partition 11 is provided in the valve body cavity and partitions the valve body cavity into an air storage cavity 12 and an external cavity. The partition 11 is provided with a valve hole 110 for communicating the gas storage chamber 12 with the external chamber. The valve body 4 is used for sealing the valve hole 110.

The check ring 5 is arranged in the external cavity and divides the external cavity into an upper chamber and a braking chamber 13, and a through hole 51 communicating the upper chamber with the braking chamber 13 is arranged on the check ring 5. The retaining ring 5 can be directly fixed on the inner side wall of the valve body 1, in this embodiment, the retaining ring 5 is arranged between the valve body 1 and the retaining ring boss 17 for bearing the retaining ring 5 is arranged on the inner side wall of the valve body 1.

The second piston 3 includes a piston body 31 sliding along an inner side wall of the upper chamber, a retainer ring 32 provided on the piston body 31, and a pushing portion 33 positioned opposite to the valve body 4. The stop ring 32 slides along the wall of the through hole 51 and cooperates with the piston body 31 to block the through hole 51. The through hole 51 is closed by the cooperation of the baffle ring 32 and the piston body 31, so that the air in the brake chamber 13 can only flow out through the air outlet 18 to brake the brake.

In order to ensure that the gas in the brake chamber 13 is only exhausted from the gas outlet 18 of the valve body 1, a sealing ring needs to be arranged between the barrier ring 32 and the retainer ring 5 to ensure the sealing performance of the two in the sliding process. Preferably, a gasket mounting groove is provided on the retainer ring 5, and a notch of the gasket mounting groove is provided along a hole wall of the through hole 51.

The arrangement of the baffle ring 32 divides the piston body 31 into two parts, wherein the area located at the inner ring of the baffle ring 32 is an air pressure pushing area 311, and the area located at the outer ring of the baffle ring 32 is an air pressure isolating area 312. The air pressure pushing area 311 forms a cavity wall of the brake cavity 13, that is, the air pressure pushing area 311 is located in the brake cavity 13, and the air pressure in the brake cavity 13 plays a certain role in pushing the air pressure pushing area 311. Due to the arrangement of the retainer ring 5, the air pressure isolation area 312 is isolated from the brake cavity 13, that is, the air pressure isolation area 312 is not affected by the air pressure in the brake cavity 13.

The design of the structure ensures that the pushing area of the air pressure on the upper end surface of the second piston 3 is unequal to the pushing area of the air pressure on the lower end surface of the second piston 3, and the pushing area of the air pressure on the upper end surface of the second piston 3 is larger than the pushing area of the air pressure on the lower end surface of the second piston 3. Thus, under the same pressure, the bearing area of the upper end surface of the second piston 3 is large, so that the pressure applied to the upper end surface is also large, which is beneficial to pushing the second piston 3 to move downwards and can facilitate the opening of the valve hole 110. The area difference that the upper surface and the downside of second piston 3 bore the atmospheric pressure effect has realized the effect of an amplification pressure in fact, even if so the upside of second piston 3 also can make second piston 3 move great distance down when receiving the effect that less atmospheric pressure promoted, thereby realize the rapid opening of spiracle, the cavity at the upside place of second piston 3 is the drive chamber usually, the atmospheric pressure of stepping on brake pedal braking master cylinder coming enters into the drive chamber and removes in order to promote second piston 3, just so do benefit to trampling of footboard. According to the above principle, when the area of the lower side of the second piston 3 receiving the air pressure is constant, the larger the area of the upper side of the second piston 3 receiving the air pressure is, the more advantageous it is to achieve the rapid opening of the valve. It is thus possible to vary the speed of opening of the valve by varying the size of the area on the upper side of the second piston 3 that is subjected to the air pressure, thus achieving a change between rapid braking and slow braking.

The pushing portion 33 is provided to push the valve body 4 to move away from the valve hole 110 to open the valve hole 110. The second piston 3 slides from top to bottom along the inner side wall of the valve body 1 after receiving acting force, the pushing part 33 moves close to or away from the valve body 4 along with the movement of the second piston 3, when the upper end of the second piston 3 has air pressure to push the second piston 3 to move close to the direction of the valve body 4, the pushing force generated by the pushing part 33 drives the valve body 4 to move towards the direction away from the valve hole 110, and therefore the opening of the valve hole 110 is achieved. In this embodiment, the pushing portion 33 is a boss disposed on the piston body 31, and the pushing portion 33 may also be a rod disposed on the piston body 31 or the pushing portion 33 may be a ring body fixed on the piston body 31. The purpose of the pushing portion 33 is to facilitate opening of the valve hole 110. After the valve hole 110 is opened, the air in the air storage cavity 12 enters the brake cavity 13 through the valve hole 110, and then the vehicle is braked during running.

The valve resetting member 6 is arranged to drive the valve body 4 to move towards the valve hole 110 so as to block the valve hole 110. When the force generated by the air pressure acting on the upper end of the second piston 3 is removed, the second piston 3 is driven to move to a position close to the valve hole 110 under the action of the valve resetting piece 6 so as to block the valve hole 110. At this time, the air pressure in the air storage chamber 12 cannot enter the brake chamber 13, and thus the vehicle cannot be braked.

In this embodiment, two pistons, i.e., a first piston 2 and a second piston 3, are provided to push the opening of the valve hole 110, the first piston 2 slides along the inner side wall of the upper chamber, the first piston 2 is provided on the upper side of the second piston 3, and the first piston 2 passes through the second piston 3 to push the opening of the valve seat 4. An upper cover 16 is fixed at the top end of the valve body 1, and a first driving cavity 14 is formed between the first piston 2 and the upper cover 16. The valve body 1 is provided with a first control port 19 communicated with the first driving chamber 14, and when braking, air pressure from a brake master cylinder when a brake pedal is pressed down enters the first driving chamber 14 through the first control port 19, so that the first piston 2 and the second piston 3 are pushed to integrally move downwards to open the valve hole 110. A second drive chamber 15 is formed between the first piston 2 and the second piston 3; the valve body 1 is provided with a second control port 20 communicated with the second driving cavity 15, and when the brake is braked, air pressure from a brake master cylinder when a brake pedal is stepped down enters the second driving cavity 15 through the second control port 20, so that the second piston 3 is pushed to move downwards to open the valve hole 110.

In order to achieve different speeds of opening the valve bore 110, the area of the cross section of the first piston 2 is designed to be different from the area of the cross section of the second piston 3. Specifically, the area of the cross section of the first piston 2 is smaller than the area of the cross section of the second piston 3. The brake air pressure enters the first control port 19 to control the movement of the first piston 2 to push the valve body 4 open and the brake air pressure enters the second control port 20 to control the movement of the second piston 3 to push the valve body 4 open. The resulting braking force is different between the brake pressure entering from the first control port 19 and the brake pressure entering from the second control port 20 due to the non-uniform piston area of the first piston 2 and the second piston 3. Therefore, the function of adjusting different braking force can be realized only by changing the mode that the braking air pressure enters different control ports, and the use is convenient.

In the use process, when the brake valve is in a non-use state as shown in fig. 1, the first drive chamber 14 and the second drive chamber 15 have no air pressure, and the first piston 2 is located at the topmost position of the valve body 1, and the top end of the second piston 3 abuts against the bottom end of the first piston 2. When a large braking force is needed, an air pipe from a brake master cylinder is connected to the second control port 20 by stepping down the brake pedal, air pressure transmitted by the brake master cylinder enters the second driving cavity 15, the air pressure in the second driving cavity 15 pushes the second piston 3 to move downwards, in the process that the second piston 3 moves downwards, the pushing portion 33 on the second piston 3 pushes the valve body 4 to move towards a direction far away from the valve hole 110, at the moment, the valve hole 110 is opened, and air pressure in the air storage cavity 12 enters the brake cavity 13, so that the reference to fig. 2 is provided. The second piston 3 is pushed to move downwards under the action of air pressure in the second driving cavity 15 to open the valve hole 110, the air pressure in the air storage cavity 12 below the valve hole 110 is released into the brake cavity 13, the acting force of the air pressure entering the brake cavity 13 on the second piston 3 is only limited in the area of the air pressure pushing area 311 of the second piston 3 due to the partition of the check ring, so that the area of the upper side of the second piston 3 under the action of the air pressure is large, the area of the lower side of the second piston 3 under the action of the air pressure is small, and the second piston 3 can rapidly move downwards to push the valve body 4 to open the valve hole 110.

When a medium braking force is needed, an air pipe from a brake master cylinder is connected to the first control port 19 when a brake pedal is stepped down, air pressure transmitted by the brake master cylinder enters the first driving cavity 14, the air pressure in the first driving cavity 14 pushes the first piston 2 to move downwards, the first piston 2 pushes the second piston 3 to move downwards together, please refer to fig. 3, in the process of moving downwards, the pushing portion 33 on the second piston 3 pushes the valve body 4 to move towards a direction far away from the valve hole 110, and at the moment, the valve hole 110 is opened, so that the air pressure in the air storage cavity 12 enters the brake cavity 13. When the air pressure in the first driving cavity 14 acts on the first piston 2, because the area of the first piston 2 bearing the action of the air pressure is smaller than the area of the second piston 3, the pressure applied to the first piston 2 under the action of the same air pressure intensity generated in the pedal stepping process is relatively smaller, compared with the situation that the air pressure acts on the second piston 3, the pushing force generated after the air pressure acts on the first piston 2 is smaller, the speed of opening the valve is slower, and the braking effect is not obvious. The brake valve can be freely switched under different requirements conveniently by the aid of the structure, and corresponding brake can be selected according to requirements, so that better use experience is provided.

In order to further adjust the speed of the second piston 3 for opening the valve seat, the brake valve of the embodiment is further provided with a pressure regulating device. Atmospheric pressure cuts off district 312, separate shelves ring 32, form cushion chamber 8 between retaining ring 5 and valve body 1's the inside wall, cushion chamber 8 and regulator intercommunication, regulator is used for adjusting the atmospheric pressure in the cushion chamber 8, that is also the regulator is used for the adjustment to use the atmospheric pressure that atmospheric pressure cuts off district 312 position and received, this atmospheric pressure can play certain hindrance effect to the downstream of second piston 3, thereby the realization plays the cushioning effect to the falling speed of second piston 3, the design of above-mentioned structure can make the braking dynamics of brake valve obtain more careful adjustment, make the more wide range of adjustment range.

In order to prevent the pistons from tilting during sliding, the first piston 2 is provided with a guide post 21 extending in the direction of the second piston 3, and the second piston 3 is provided with a first guide groove 34 adapted to the guide post 21. The sliding of the second piston 3 is guided by the cooperation of the guide post 21 and the first guide groove 34. Specifically, a seal ring is further disposed between the guide post 21 and the first guide groove 34, and the guide post 21 slides in close contact with the inner side wall of the first guide groove 34.

In order to prevent the first piston 2 from tilting during the movement, the guide post 21 is provided with a second guide groove 211, and the upper cover 16 is provided with an upper cover guide post 161 adapted to the second guide groove 211. The specific guide post 161 is clearance-fitted with the second guide groove 211. Further, in order to achieve a better guiding effect, the guide post 21 is disposed at a central position of the first piston 2. Similarly, the guide post 161 is disposed at the center of the upper cover 16.

In this embodiment, in order to better realize the function of the valve seat 4, the valve body 4 includes a body 41, a blocking portion 42 disposed on the outer side wall of the body 41 along the circumferential direction of the body 41, and a bearing portion 43 fixedly connected to the body 41 for receiving the pushing force of the pushing portion 33; the bearing portion 43 passes through the valve hole 110 and extends in the direction of the second piston 3. The partition 11 is provided with a shoulder 111 that fits the stopper 42. The body 41 is disposed in the air storage cavity 12, in this embodiment, the body 41 is an annular structure, and the body 41 is annular. Preferably, the bearing portion 43 is also provided as a ring body, which is fixed at the end position of the body 41. Of course, the bearing portion 43 may be a plurality of rods fixed to one end of the body 41, and a gap is provided between adjacent rods. The blocking portion 42 is disposed between the body 41 and the bearing portion 43.

Further, in order to further improve the effect of the valve body 4 for closing the valve hole 110, a second sealing member 421 is provided at a position of the closing portion 42 opposite to the shoulder portion 111. A first seal 431 is provided on the same carrier 43 at a position opposite to the pushing portion 33. The first sealing part 431 and the second sealing part 421 are both made of rubber, and a sealing ring made of rubber is arranged on the blocking part 42, so that the sealing performance between the blocking part 42 and the shoulder part 111 can be effectively ensured, and the blocking effect of the valve hole 110 is better.

In order to avoid the valve body 4 from being damaged due to an excessively large lowering position of the second piston 3, a stopper 112 for limiting a lowering stroke of the second piston 3 is further provided on the partition portion 11, and the stopper 112 is fixed to the shoulder portion 111 and extends in a direction in which the second piston 3 is located. When the second piston 3 descends to abut against the limiting member 112, the second piston 3 stops moving downwards. The limiting members 112 are preferably rod bodies fixed on the shoulder portion 111, wherein the limiting members 112 may be provided in a plurality of numbers, the plurality of limiting members 112 annularly surround the valve hole 110, and a space is provided between adjacent limiting members 112, the purpose of the space is to enable the air pressure in the air storage chamber 12 to enter the brake chamber 13 more smoothly after the valve hole 110 is opened. Of course, in this embodiment, the retainer ring 5 can also limit the downward movement stroke of the second piston 3.

In order to fix the valve body 4 conveniently, the brake valve further comprises a valve seat 7 arranged in the air storage cavity 12, and the valve seat 7 is used for installing and fixing the valve body 4. Specifically, the valve seat 7 includes a fixing plate 71 fixed to the valve body 1, a through hole 72 provided in the fixing plate 71, and a retainer ring 73 provided on the fixing plate 71 along an edge of the through hole 72; the retainer ring 73 extends in the direction of the valve hole 110. In order to ensure the tightness in the air storage chamber 12, a sealing ring is provided between the fixing plate 71 and the valve body 1. In this embodiment, the fixing plate 71 may be fixed to the valve body 1 by a snap spring. A sealing ring is arranged between the valve body 4 and the inner side wall of the limit ring 73, and the valve body 4 slides along the inner side wall of the limit ring 73. The valve body 4 moves up and down along the inner side wall of the retainer ring 73 by the second piston 3. The stop ring 73 is furthermore arranged to extend in the direction of the valve bore 110 for the purpose of fixedly supporting the valve return 6. Specifically, in this embodiment, the valve reset piece 6 is a spring sleeved outside the body limiting ring 73, a first end of the spring abuts against the fixing plate 71, and a second end of the spring abuts against the valve body 4. The second piston 3 compresses the spring through the valve body 4 in the process of moving downwards, the spring accumulates restoring force at the moment, and after the force at the upper end of the second piston 3 is cancelled, the spring pushes the valve body 4 to move upwards under the action of the restoring force so as to block the valve hole 110.

The utility model discloses a brake valve can be used to multiple motorcycle type, for example correspond light truck under the state of underloading or the better condition of road conditions can manage the trachea control of brake pedal to receive first piston 2 corresponding first control mouth 19 on, satisfy the braking dynamics of low on one's side. If the automobile runs to a mountainous area or is in a heavy-load state in the running process, the braking force needs to be correspondingly improved, the position of the control port only needs to be changed without changing a brake valve, namely, the braking force can be adjusted only by connecting an air pipe control pipe of a brake pedal to the second control port 20 corresponding to the second piston 3, and diversified requirements can be met. The brake valve disclosed by the invention has the advantages that in order to meet the requirement of frequent brake force adjustment, the brake valve does not need to be adjusted in a complex manner, is convenient to operate, can meet the adjustment requirement without replacing the brake valve, avoids increasing the cost, saves energy and reduces consumption; the design is simple, and simple structure need not to look for professional installation and debugging, and is stable high-efficient. The brake master cylinder pedal can adapt to various driving habits of drivers, for example, some drivers are used to strong braking force, the brake master cylinder pedal is used to step on 1/3, and the stepping depth is not favored, because the feet and legs are particularly tired due to long-time operation, particularly the road conditions of mountainous areas with sharp turns, and the body can not be eaten due to frequent braking. Some drivers are used softly and like to step on the brake master cylinder deeply, and the more the brake force is, the better the requirements can be met only by replacing the control port, and the operation is simple and the use is convenient.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. A brake valve, characterized by: the valve comprises a valve body, a first piston, a second piston, a valve body, a check ring and a valve reset piece;

2. The brake valve of claim 1, wherein: the area of the cross section of the first piston is smaller than the area of the cross section of the second piston.

3. The brake valve of claim 1, wherein: the first piston is provided with a guide post extending towards the second piston, and the second piston is provided with a first guide groove matched with the guide post.

4. The brake valve of claim 3, wherein: the guide post is provided with a second guide groove, the top end of the valve body is fixed with an upper cover, and the upper cover is provided with an upper cover guide post matched with the second guide groove.

5. The brake valve of claim 1, wherein: the brake valve further comprises a pressure regulating device, and the pressure regulating device is used for regulating the air pressure acting on the second piston in the area outside the baffle ring.

6. The brake valve of claim 1, wherein: the valve body comprises a body, a plugging part arranged on the outer side wall of the body along the circumferential direction of the body, and a bearing part fixedly connected with the body and used for bearing the pushing force of the pushing part; the bearing part penetrates through the valve hole and extends towards the direction of the second piston;

7. The brake valve of claim 6, wherein: the bearing part is provided with a first sealing element at a position opposite to the pushing part, and the plugging part is provided with a second sealing element at a position opposite to the shoulder part.

8. The brake valve of claim 6, wherein: the partition part is further provided with a limiting part for limiting the descending stroke of the second piston, and the limiting part is fixed on the shoulder part and extends towards the direction of the second piston.

9. The brake valve of claim 1, wherein: the brake valve also comprises a valve seat arranged in the air storage cavity, and the valve seat comprises a fixed plate fixed on the valve body, a through hole arranged on the fixed plate and a limiting ring arranged on the fixed plate along the edge position of the through hole;

10. The brake valve of claim 9, wherein: the valve reset piece is a spring which is sleeved outside the body limiting ring, the first end of the spring is abutted to the fixed plate, and the second end of the spring is abutted to the valve body of the valve.