CN115520165A

CN115520165A - Brake valve buffer cavity pressure regulating mechanism and brake valve assembly

Info

Publication number: CN115520165A
Application number: CN202211189571.5A
Authority: CN
Inventors: 王汉峰
Original assignee: Shandong Anshun Brake System Co ltd
Current assignee: Shandong Anshun Brake System Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-12-27

Abstract

The invention discloses a brake valve buffer cavity pressure regulating mechanism and a brake valve assembly, wherein the brake valve buffer cavity pressure regulating mechanism comprises: the shell is provided with an inner cavity, and an air inlet channel and an air outlet channel which are communicated with the inner cavity; the air valve is movably arranged in the inner cavity, and closes the conduction of the air inlet channel and the air outlet channel when in a first position, and leads the air inlet channel and the air outlet channel when in a second position; the opening mechanism comprises a pushing piece and a pressure relief channel, wherein the pushing piece is used for being abutted against the valve to push the valve to move, the pressure relief channel is arranged on the pushing piece and is communicated with the outside, the pushing piece moves in the inner cavity and is provided with a closed position for closing the pressure relief channel and a pressure relief position for communicating the pressure relief channel with the air outlet channel; the shell is internally provided with an expansion cavity and a control channel for communicating the expansion cavity with the outside, and when the air pressure in the expansion cavity is increased, the expansion cavity expands and extends to drive the pushing piece to move towards the pressure relief position. The invention can conveniently control the regulation of the air pressure in the buffer cavity.

Description

Brake valve buffer cavity pressure regulating mechanism and brake valve assembly

Technical Field

The invention relates to the technical field of vehicle braking, in particular to a pressure regulating mechanism of a buffer cavity of a brake valve and a brake valve assembly.

Background

The brake system is the most important part for ensuring the safe running of the vehicle, but the air brake system adopted by the existing freight car, particularly a large freight car, has a plurality of disadvantages, when the empty car brakes, the brake force can be satisfied, but the integral inertia of the vehicle after loading the cargo is large, the brake force provided by a common brake valve is difficult to satisfy the brake requirement, the brake valve with large brake force needs to be replaced usually to achieve the heavy car brake effect, and the brake system with large air displacement can lock the tire once the pedal is slightly stepped when the vehicle brakes in an idle state, the tire is dragged to be scrapped quickly, meanwhile, certain damage is caused to the hub, and the considerable maintenance cost is increased. And when the vehicle runs on wet and slippery road surfaces in rainy and snowy days, the vehicle is easy to have the phenomena of braking deviation and drifting to cause safety accidents.

In order to solve the technical problems, the prior art provides a combined brake valve with a buffer cavity pressure regulating mechanism, the brake valve is provided with the buffer cavity pressure regulating mechanism, the air pressure in a buffer chamber at the lower part of a brake piston is controlled by the buffer cavity pressure regulating mechanism so as to change the ratio of the air pressure in a control chamber at the upper side of the brake piston and the air pressure in a buffer chamber at the lower side of the brake piston, the downward moving speed of the piston can be effectively controlled by adjusting the ratio so as to change the response speed of the brake valve, and the change of the response speed of the brake valve can influence the braking effect of a vehicle.

The buffer cavity pressure regulating mechanism in the prior art is inconvenient to regulate the air pressure in the buffer cavity and is inconvenient to control.

Disclosure of Invention

The invention aims to provide a pressure regulating mechanism of a buffer cavity of a brake valve and a brake device, which are used for solving the defects in the prior art and can conveniently control the regulation of air pressure in the buffer cavity.

The invention provides a pressure regulating mechanism for a buffer cavity of a brake valve, which comprises:

the shell is provided with an inner cavity, and an air inlet channel and an air outlet channel which are communicated with the inner cavity;

the valve is movable in the inner cavity and provided with a first position and a second position, the valve closes the conduction of the air inlet channel and the air outlet channel when in the first position, and the valve leads the air inlet channel and the air outlet channel when in the second position;

the opening mechanism comprises a pushing piece and a pressure relief channel, the pushing piece is used for being abutted against the valve to push the valve to move, the pressure relief channel is arranged on the pushing piece and communicated with the outside, the pushing piece moves in an inner cavity and is provided with a closed position for closing the pressure relief channel and a pressure relief position for communicating the pressure relief channel with the air outlet channel;

the shell is internally provided with an expansion cavity and a control channel for communicating the expansion cavity with the outside, and when the air pressure in the expansion cavity is increased, the expansion cavity expands and extends to drive the pushing piece to move towards the pressure relief position.

Further, when the pushing piece is located at the closed position, the pushing piece abuts against the valve;

when the pushing piece is located at the pressure relief position, the pushing piece is far away from the air valve, and the air valve is located at the first position at the time.

Further, the pushing member includes a piston portion slidably disposed in the inner chamber, a portion of the piston portion forming an inner wall of the expansion chamber, and the piston portion moving in a direction of increasing a volume of the expansion chamber when the air pressure in the expansion chamber increases;

the pushing piece is provided with a pushing rod arranged on the piston part, extends towards the valve and is used for abutting against the valve to push the valve to move towards a second position;

when the pushing piece is located at the closed position, the push rod is abutted against the valve; when the pushing piece is located at the pressure relief position, the push rod is separated from the valve.

Further, the pressure relief channel comprises a pressure relief inlet, a pressure relief outlet and a pressure relief connecting hole; the pressure relief inlet is arranged on one side, facing the air valve, of the push rod; the pressure relief outlet is arranged on one side of the piston part, which is far away from the push rod; the pressure relief connecting hole penetrates through the push rod and the piston part and is communicated with the pressure relief inlet and the pressure relief outlet.

Further, the inner cavity comprises a first cavity, a second cavity and a connecting cavity for communicating the first cavity with the second cavity; the air inlet channel is communicated with the first cavity, and the air outlet channel is communicated with the connecting cavity; the connecting chamber having a connecting chamber inlet disposed on the first chamber sidewall;

the air valve is movable in the first cavity and closes the connecting cavity inlet when in a first position;

the push rod is arranged in the connecting cavity and is in clearance fit with the connecting cavity, and when the air valve is located at the second position, the first cavity is communicated with the air outlet channel through a clearance part between the push rod and the connecting cavity.

Further, the air valve is in clearance fit with the inner wall of the first cavity;

the air inlet channel is provided with an air inlet channel outlet arranged on the inner wall of the first cavity, and the valve is movably arranged between the air inlet channel outlet and the connecting cavity inlet; the valve is pushed by the air pressure and moves towards the direction of closing the inlet of the connecting cavity when the air pressure of the first cavity is increased, and the valve is pushed by the pushing piece to move towards the direction of opening the inlet of the connecting cavity when the air pressure of the first cavity is reduced;

the brake valve buffer cavity pressure regulating mechanism is also provided with a valve resetting piece arranged in the first cavity, and the resetting resilience force of the valve resetting piece is used for pushing the valve to move towards the direction of closing the inlet of the connecting cavity;

the brake valve buffer cavity pressure regulating mechanism is further provided with a sealing ring arranged outside the push rod, the sealing ring is arranged between the push rod and the inner wall of the connecting cavity, and part of the push rod forms the inner wall of the expansion cavity.

Further, the piston part is arranged in the second cavity in a sliding mode, a sealing ring is arranged between the piston part and the inner wall of the second cavity, a pressure relief buffer cavity is formed between one side, away from the push rod, of the piston part and the inner wall of the second cavity, a pressure relief hole communicated with the pressure relief buffer cavity is further formed in the shell, and the pressure relief channel is communicated with the pressure relief buffer cavity;

the brake valve buffer cavity pressure regulating mechanism is also provided with an elastic expansion piece arranged in the pressure relief buffer cavity, and the elastic expansion piece is arranged to drive the pushing piece to move towards the direction of the air valve and contract under the action of the pushing piece to accumulate resetting resilience force.

The invention also discloses a brake valve assembly, which comprises a brake valve and the brake valve buffer cavity pressure regulating mechanism as claimed in any one of claims 1 to 7, wherein the brake valve comprises a valve body and a brake piston arranged in the valve body in a sliding way, and the valve body is internally provided with a driving cavity positioned above the brake piston and a buffer cavity and a brake cavity positioned on the lower side of the brake piston; the brake cavity is communicated with the air inlet channel, and the buffer cavity is communicated with the air outlet channel.

Further, an expansion cavity and a control channel communicated with the expansion cavity are further formed in the shell, and the control channel is communicated with the driving cavity.

Furthermore, the brake valve is also internally provided with an air storage cavity and an air valve for communicating the air storage cavity with the brake cavity, and the brake valve is also provided with a brake air valve which is movable in the air storage cavity and used for plugging the air valve; and a brake piston push rod is arranged on one side, which is far away from the driving cavity, of the brake piston and is used for pushing the brake valve to move towards the direction of opening the valve.

Compared with the prior art, can fill atmospheric pressure to in the cavity with air outlet channel intercommunication through inlet channel in this embodiment, set up pressure release channel simultaneously and can make the rapid obtaining of atmospheric pressure in the cavity with air outlet channel intercommunication release to can realize the regulation to the atmospheric pressure of the cavity of air outlet channel intercommunication, and then promote brake valve's suitability. The arrangement of the expansion cavity communicated with the driving cavity can drive the pushing piece to move according to the air pressure condition in the driving cavity so as to control the opening of the pressure relief channel, so that the air pressure in the buffer cavity can be better controlled, and different brake adjustments can be met.

Drawings

FIG. 1 is a schematic structural diagram of a brake valve disclosed in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a pressure regulating mechanism of a buffer chamber of a brake valve according to an embodiment of the disclosure;

FIG. 3 is a schematic structural diagram of a matching relationship between an adjusting rod and a connecting sleeve in the pressure adjusting mechanism of the brake valve buffer cavity disclosed by the embodiment of the invention;

description of reference numerals: 1-shell, 10-inner cavity, 11-inlet channel, 110-inlet channel outlet, 12-outlet channel, 13-expansion cavity, 14-control channel, 15-first cavity, 16-second cavity, 17-connecting cavity, 171-connecting cavity inlet, 18-pressure relief hole,

2-a gas-valve is arranged on the gas pipe,

3-opening mechanism, 31-pushing piece, 310-piston part, 311-push rod,

32-pressure relief channel, 321-pressure relief inlet, 322-pressure relief outlet, 323-pressure relief connecting hole;

4-a valve reset piece is arranged on the valve seat,

5-elastic expansion piece, 51-compression spring, 52-adjusting rod supporting piece, 521-supporting piece body part, 522-positioning groove,

6-adjusting mechanism, 61-electric drive, 611-motor, 612-motor output shaft,

62-an adjusting rod, 621-a limit column,

63-connecting sleeve, 630-spacing hole,

7-controlling the system to be controlled,

100-brake valve, 101-brake piston, 102-buffer chamber, 103-brake air valve, 104-brake chamber, 106-air storage chamber, 107-drive chamber, 108-brake piston push rod.

Detailed Description

The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention discloses a control method for a brake valve buffer chamber pressure regulating mechanism, which is mainly applied to the brake valve buffer chamber pressure regulating mechanism, and is used for adjusting the buffer chamber pressure regulating mechanism to further adjust the air pressure in the buffer chamber in the brake valve. The brake valve cushion chamber pressure regulating mechanism can be used on the brake valve 100 to regulate the downward moving speed of the brake piston 101 in the brake valve 100, thereby regulating the effect of braking on the brake valve 100 and the response speed of braking. It should be noted that the brake valve with the adjustable brake valve cushion chamber pressure-adjusting mechanism 100 needs to be provided with a cushion chamber 102 on the lower side of the brake piston 101. The brake valve cushion chamber pressure regulating mechanism is used for regulating the air pressure condition in the cushion chamber 102.

In order to meet different load requirements, the brake valve 100 in the prior art generally has a buffer chamber 102 at the lower part of the brake piston 101, and a driving chamber 107 at the upper side of the brake piston 101, when the pedal is stepped on to generate a braking demand, the air pressure in the driving chamber 107 increases to drive the brake piston 101 to move downwards, and the air in the buffer chamber 102 at the lower side of the brake piston 101 can generate resistance to the descending of the brake piston 101, thereby playing a role of resisting against the downward movement of the brake piston 101. Therefore, the descending speed of the brake piston 101 can be controlled by controlling the air pressure in the buffer cavity 102.

Specifically, in a light load state, when the braking device is not needed to brake too sensitively, a certain amount of air pressure can be filled in the buffer cavity 102 to enable the braking piston 101 to move downwards more smoothly, the downward slow movement of the braking piston 101 enables the opening of the braking air valve 103 to be more moderate, that is, the speed of opening the air valve is moderate, the air pressure entering the braking cavity 104 is relatively less finally, and the effect of gentle braking in an idle load or light load state is finally achieved.

In a heavy-load state, the braking response is required to be timely, so that the air pressure in the buffer cavity 102 needs to be released, and resistance cannot be generated when the braking piston 101 moves downwards to open the braking air valve 103, so that the braking piston 101 moves downwards quickly to open the braking air valve 103 quickly to generate quick braking.

Specifically, the brake valve that can be adjusted by the brake valve cushion chamber pressure regulating mechanism may be a relay valve of a tractor of a heavy truck, a relay valve of a trailer of the heavy truck, or other brake valves that meet the above conditions.

The brake valve cushion chamber pressure regulating mechanism in this embodiment includes: a shell 1, a gas valve 2 and an opening mechanism 3; the gate valve 2 cooperates with the opening mechanism 3 to open or close a passage into the buffer chamber 102, which in this embodiment includes the inlet passage 11 and the outlet passage 12.

The shell 1 is provided with an inner cavity 10, and an air inlet channel 11 and an air outlet channel 12 which are communicated with the inner cavity 10 are arranged on the shell 1; the air outlet channel 12 is communicated with the buffer cavity 102, and the air entering from the air inlet channel 11 enters the buffer cavity 102 through the air outlet channel 12.

The conduction or the closure of the inlet passage 11 and the outlet passage 12 can be achieved by moving the throttle valve 2 in the present embodiment. The air valve 2 is movable in the inner cavity 10 and has a first position and a second position, the air valve 2 moves between the first position and the second position, when the air valve 2 moves to the first position, the air valve 2 closes the conduction of the air inlet channel 11 and the air outlet channel 12, and when the air valve 2 moves to the second position, the air valve 2 conducts the air inlet channel 11 and the air outlet channel 12.

When the air inlet passage 11 and the air outlet passage 12 are conducted, the air pressure in the brake chamber 104 can be filled into the buffer chamber 102 through the air inlet passage 11 and the air outlet passage 12, thereby adjusting the air pressure in the buffer chamber 102.

The external force urging movement of the valve 2 from the second position toward the first position in this embodiment is air pressure acting on the valve 2, and the urging force of the air pressure urges the valve to move toward the first position to close the passage into the buffer chamber 12. The air pressure enters the cavity where the air valve 2 is located through the air inlet channel, and when the air pressure reaches a certain threshold value, the air valve 2 is pushed to move to the first position.

The air pressure pushing the valve 2 to move can come from the brake chamber 104, when the air pressure in the brake chamber 104 is larger, indicating that rapid braking is required at this time, therefore, the brake piston 101 is required to move down rapidly, so that re-entry of air pressure in the buffer chamber 102 is not required, and therefore, the passage into the buffer chamber 102 needs to be closed.

It will be appreciated that in order to unload the air pressure in the buffer chamber 102 to more rapidly move the brake piston 101 downwards to open the brake valve 103, the brake valve assembly is also provided with a pressure relief passage 32, and the pressure relief passage 32 is used to release the air pressure in the buffer chamber 102. The pressure relief passage 32 may be provided in the brake valve cushion chamber pressure regulating mechanism.

When the air pressure pushing the valve 2 to move weakens, the buffer chamber 102 needs to be opened again to allow the air pressure to enter the buffer chamber 102, and at this time, the valve 2 needs to move to the second position to conduct the passage into the buffer chamber 102, so that the air pressure enters the buffer chamber 102.

In order to facilitate the control of the movement of the valve 2, the brake valve buffer chamber pressure regulating mechanism in this embodiment further includes an opening mechanism 3, and the opening mechanism 3 is configured to control the valve 2 to move toward the second position to open the passage into the buffer chamber 102, so that the air pressure enters the buffer chamber 102. This enables the opening or closing of the passage into the buffer chamber 102 by the cooperation of the opening mechanism 3 and the valve 2.

The opening mechanism 3 is capable of pushing the valve 2 to move to the second position after abutting against the valve 2, and conducting the inlet passage 11 and the outlet passage 12 after moving.

The air outlet channel 12 is communicated with a buffer cavity 102 of the brake valve 100, and air pressure is filled into the buffer cavity 102 through the air inlet channel 11 and the air outlet channel 12, so that the air pressure in the buffer cavity 102 is increased, the air pressure in the buffer cavity 102 generates thrust resisting downward movement of the brake piston 101 to slow down the downward movement speed of the brake piston 101, and at the moment, the arrangement of the buffer cavity 102 can meet the requirement of brake release.

When emergency braking is required, the valve 2 is pushed to the first position to close the communication between the inlet channel 11 and the outlet channel 12, thereby blocking the gas from entering the buffer chamber 102. Meanwhile, after the existing air pressure in the buffer cavity 102 is exhausted through the pressure relief channel 32, the air pressure in the buffer cavity 102 is reduced to increase the downward moving speed of the brake piston 101, so that the requirement of emergency braking is met.

The intake passage 11 is adapted to communicate with a brake chamber 104 of the brake valve 100 during actual use, and the brake chamber 104 is adapted to supply air to the cushion chamber 102. When the brake pedal is stepped, the air pressure in the driving cavity 107 positioned on the upper side of the brake piston 101 is increased, the brake piston 101 is driven to move downwards and move towards the direction of the brake valve 103 in the brake valve 100, the brake valve 103 is opened by the brake piston 101, after the brake valve 103 is opened, the air released from the air storage cavity 106 enters the brake cavity 104, the air in the brake cavity 104 enters the corresponding part to generate brake, and on the other hand, the air in the brake cavity 104 enters the buffer cavity 102 through the air inlet channel 11 and the air outlet channel 12, so that the air pressure in the buffer cavity 102 is filled.

In this embodiment, the opening mechanism 3 includes a pushing member 31 for abutting against the air valve 2 to push the air valve 2 to move, and a pressure relief channel 32 provided on the pushing member 31, the pressure relief channel 32 is communicated with the outside, the pushing member 31 is movable in the inner cavity 10 and has a closed position for closing the pressure relief channel 32 and a pressure relief position for communicating the pressure relief channel 32 with the air outlet channel 12.

When communicating with air outlet channel 12, pressure relief channel 32 allows air pressure in buffer cavity 102 to be released outward through pressure relief channel 32, thereby relieving the air pressure in buffer cavity 102. It will be appreciated that when the pusher 31 moves to the pressure relief position, the valve 2 is moved to the first position, in which it closes the passage into the buffer chamber 102.

In this embodiment, the air pressure can be filled into the buffer cavity 102 communicated with the air outlet channel 12 through the air inlet channel 11, and the pressure relief channel 32 is arranged to rapidly release the air pressure in the buffer cavity 102 communicated with the air outlet channel 12, so that the adjustment of the air pressure in the buffer cavity communicated with the air outlet channel 12 can be realized, and the applicability of the brake valve 100 is further improved.

In order to control the movement of the opening mechanism 3 to the pressure relief position, in the pressure regulating mechanism of the brake valve buffer chamber in this embodiment, an expansion chamber 13 and a control channel 14 communicating the expansion chamber 13 with the outside are further provided in the housing 1, and when the air pressure in the expansion chamber 13 increases, the expansion chamber 13 expands and extends to drive the pushing member 31 to move to the pressure relief position.

It should be noted that in the specific embodiment, the expansion chamber 13 is communicated with the driving chamber 107, the air pressure in the driving chamber 107 can reflect whether braking is urgent, when the air pressure in the driving chamber 107 is large, it indicates that braking is urgent, therefore, it is necessary that the descending speed of the brake piston 101 is large, at this time, the air pressure in the buffer chamber 102 needs to be unloaded, and since the expansion chamber 13 is communicated with the driving chamber 107, the large air pressure in the driving chamber 107 is reflected in the expansion chamber 13, so as to drive the expansion chamber 13 to expand and extend, and when the expansion chamber 13 expands and extends, the pushing member 31 is driven to move to the pressure relief position, so that the air in the buffer chamber 102 is exhausted through the pressure relief channel 32.

In this embodiment, the expansion cavity 13 communicated with the driving cavity 107 is arranged to drive the pushing member to move according to the air pressure condition in the driving cavity 107 so as to control the opening of the pressure relief channel, thereby better controlling the air pressure in the buffer cavity 102 to meet different braking adjustments.

When the pusher 31 is in the closed position, the pusher 31 abuts against the valve 2; when the pushing piece 31 is located at the pressure relief position, the pushing piece 31 is far away from the air valve 2, and the air valve 2 is located at the first position at the time.

In the embodiment, the pushing member 31 includes a piston portion 310 slidably disposed in the inner cavity 10, a portion of the piston portion 310 forms an inner wall of the expansion cavity 13, and when the air pressure in the expansion cavity 13 increases, the piston portion 310 moves toward a direction of increasing the volume of the expansion cavity 13;

the pushing piece 31 is also provided with a push rod 311 arranged on the piston part 310, and the push rod 311 extends towards the direction of the air valve 2 and is used for abutting against the air valve 2 to push the air valve 2 to move; when the pushing piece 31 is located at the closed position, the push rod 311 is abutted against the air valve 2; when the pusher 31 is in the pressure release position, the push rod 311 is separated from the valve 2.

In this embodiment, the piston portion 310 forms an inner wall of the expansion chamber 13, and in other embodiments, the expansion chamber 13 may be enclosed by an elastic sealing member such as an elastic balloon, which is placed in the inner chamber 10 and can be stretched in a specific direction when the gas in the expansion chamber 13 increases, so as to drive the pushing member 31 to move.

It will be appreciated that a sealing ring is provided between the piston portion 310 and the side wall of the inner chamber 10, and that the piston portion 310 changes the volume in the expansion chamber 13 when sliding in the inner chamber 10.

In the present embodiment, the pressure relief passage 32 includes a pressure relief inlet 321, a pressure relief outlet 322, and a pressure relief connection hole 323; the pressure relief inlet 321 is arranged on the side of the push rod 311 facing the air valve 2; the pressure relief outlet 322 is arranged on one side of the piston part 310, which is far away from the push rod 311; the pressure relief connecting hole 323 penetrates the push rod 311 and the piston portion 310 to communicate the pressure relief inlet 321 and the pressure relief outlet 322.

The pressure relief inlet 321 is arranged on the side of the push rod 311 facing the valve 2, and can close the pressure relief channel 32 when the push rod 311 abuts on the valve 2, and can open the pressure relief channel 32 when the push rod 311 is far away from the valve 2. When the push rod 311 is far away from the valve 2, the acting force of the push rod 311 acting on the valve 2 is cancelled, the valve 2 can close the conduction of the air inlet channel 11 and the air outlet channel 12 under the action of external force, and the external force acts as a driving force generated by the increase of the air pressure in the cavity where the valve 2 is located on the valve 2. The closing of the air inlet channel 11 and the air outlet channel 12 can stop the air pressure from entering the buffer cavity 102, and the air outlet channel 12 is communicated with the pressure relief channel 32 to unload the air pressure in the buffer cavity 102.

The inner cavity 10 in this embodiment includes a first cavity 15, a second cavity 16, and a connecting cavity 17 connecting the first cavity 15 and the second cavity 16; the air inlet channel 11 is communicated with the first cavity 15, and the air outlet channel 12 is communicated with the connecting cavity 17; the connecting chamber 17 has a connecting chamber inlet 171 provided on a side wall of the first chamber 15;

the valve 2 is mobile inside the first chamber 15 and closes the connecting chamber inlet 171 in the first position;

the push rod 311 is arranged in the connecting cavity 17 and is in clearance fit with the connecting cavity 17, and when the air valve 2 is located at the second position, the first cavity 15 is communicated with the air outlet channel 11 through a clearance part between the push rod 311 and the connecting cavity 17.

It can be understood that the cross-sectional dimension of the connection cavity 17 is smaller than the cross-sectional dimension of the first cavity 15, and when the air valve 2 closes the inlet channel 11 and the outlet channel 12, the air valve 2 is realized by abutting against the side wall of the first cavity 15, and since the size of the air valve 2 is larger than the size of the connection cavity 17, a covering seal can be formed on the connection cavity 17, so that the conduction of the inlet channel 11 and the outlet channel 12 is closed. That is, in the present application, when the valve 2 is in the first position, the valve 2 closes the connecting chamber inlet 171 of the connecting chamber 17, and the inlet passage 11 and the outlet passage 12 are closed by closing the connecting chamber inlet 171.

The air valve 2 is in clearance fit with the inner wall of the first cavity 15; the arrangement of such a structure enables the air valve 2 to enter the connecting chamber 17 from the clearance between the inner wall of the first chamber 15 and the air valve 2 when being away from the connecting chamber inlet 171.

The intake passage 11 has an intake passage outlet 110 provided on the inner wall of the first chamber 15, and the valve 2 is movable between the intake passage outlet 110 and a connecting chamber inlet 171; when the first chamber 15 is pressurized, the gate valve 2 is pushed by the gas pressure and moves in a direction to close the connecting chamber inlet 171, and when the first chamber 15 is depressurized, the gate valve 2 is pushed by the pusher 31 and moves in a direction to open the connecting chamber inlet 171.

The first cavity 15 is communicated with the brake cavity 104 through the air inlet channel 11, and air pressure in the brake cavity 104 enters the first cavity 15 through the air inlet channel 11 and then enters the buffer cavity 102 through the air outlet channel 12, so that air pressure in the buffer cavity 102 is supplied.

When the air pressure in the brake chamber 104 increases, it indicates that the opening speed of the brake valve 103 is fast, and a large braking force is required, so that the air pressure in the buffer chamber 102 is not required in the process, and therefore the conduction between the air inlet channel 11 and the air outlet channel 12 needs to be closed, and at this time, the air pressure is required to push the valve 2 to move in the direction of closing the connecting chamber inlet 171.

In this embodiment, the closing of the valve 2 depends on the increase of the air pressure in the first chamber 11, that is, the valve 2 is pushed to move toward the direction of closing the inlet 171 of the connection chamber by the action of the larger air pressure existing in the first chamber 11, the first chamber 11 can reflect the air pressure in the brake chamber 104 by directly communicating with the brake chamber 104, when the air pressure in the brake chamber 104 is larger, it indicates that strong braking is needed, and the valve 2 closes the communication between the air inlet channel 11 and the air outlet channel 12 and can close the air pressure to enter the buffer chamber 102.

For stably supporting the movement of the gas valve 2, the side of the gas valve 2 facing away from the pushing part 31 is further provided with a gas valve resetting part 4, the gas valve resetting part 4 is arranged in the first cavity 15, and the resetting resilience of the gas valve resetting part 4 is used for pushing the gas valve 2 to move towards the direction of closing the connecting cavity inlet 171; the resilient force accumulated by the valve returning member 4 urges the valve 2 to move together with the urging force generated by the air pressure in the first chamber 15 so that the valve 2 closes the connecting chamber inlet 171.

It will be appreciated that the return spring-back force acting on the valve 2 can be adjusted by adjusting the pre-compression of the valve return 4, so that the closing of the connecting chamber inlet 171 can be achieved in situations where a different pressure is required in the first chamber 15, and the braking situation can be adjusted. The valve return member 4 includes a valve support base screwed to the housing 1 and a valve spring provided on the valve support base for facilitating the above-described adjustment, and the valve spring is supported between the valve support base and the valve 2.

The piston part 310 is arranged in the second cavity 16 in a sliding manner, a sealing ring is arranged between the piston part 310 and the inner wall of the second cavity 16, a pressure relief buffer cavity is formed between one side of the piston part 310, which is far away from the push rod 311, and the inner wall of the second cavity 16, a pressure relief hole 18 communicated with the pressure relief buffer cavity is further formed in the shell 1, and the pressure relief channel 32 is communicated with the pressure relief buffer cavity;

the air pressure of the chamber where the air valve 2 is located is increased to push the air valve 2 to move towards the first position so as to close the conduction of the air inlet channel 11 and the air outlet channel 12, the air valve 2 drives the opening mechanism 3 to move in the process, when the air pressure of the chamber where the air valve 2 is located is reduced, the air valve 2 needs to be reset to move to the second position so as to conduct the air inlet channel and the air outlet channel, and the opening mechanism 3 pushes the air valve 2 to move towards the second position in the resetting moving process.

In order to better control the movement of the valve 2, the opening mechanism 3 is also provided with an elastic expansion piece 5, the elastic expansion piece 5 is compressed and accumulates resilience when the valve 2 moves towards the second position, and the resilience accumulated by the elastic expansion piece 5 drives the valve 2 to move towards the first position when the air pressure of the chamber in which the valve 2 is arranged is reduced. The pushing piece 31 of the opening mechanism 3 pushes the air valve 2 open, but when the air valve 2 pushes the opening mechanism 3 to move when closing, the elastic expansion piece 5 is compressed substantially, the elastic expansion piece 5 is compressed to form avoidance for the movement of the air valve 2, and the movement of the opening mechanism 3 can be realized by integrally pushing the elastic expansion piece 5.

Specifically, the elastic expansion piece 5 is arranged at one end of the push rod 311, and the valve 2 may be directly connected to the elastic expansion piece 5, in this embodiment, the valve 2 is in contact with the elastic expansion piece 5 through the push rod 311, that is, the valve 2 compresses the elastic expansion piece 5 through the push rod 311 when moving towards the second position. One end of the elastic expansion piece 5 abuts against the push rod 311, and the other end of the elastic expansion piece 5 is supported and positioned.

In the embodiment, the elastic expansion piece 5 is arranged in the pressure relief buffer cavity, and the elastic expansion piece 5 is arranged to drive the pushing piece 31 to move towards the direction of the air valve 2 and contract under the action of the pushing piece 31 to accumulate the return resilience force.

When the air pressure in the first cavity 15 is increased, the air valve 2 is driven to move towards the direction of closing the connecting cavity inlet 171, at the moment, the movement of the air valve 2 drives the push rod 311 to move, the push rod 311 can compress the elastic telescopic piece 5 in the moving process, and when the air pressure in the first cavity 15 is reduced, the elastic telescopic piece 5 can drive the push rod 311 to reset and move, so that the air valve 2 is driven to move towards the direction of opening the connecting cavity inlet 171.

In the present embodiment, the elastic expansion piece 5 includes a compression spring 51 fixed to the pushing piece 31 in an abutting manner, and the compression spring 51 is used for abutting the pushing piece 31 on the valve 2 and controlling the valve 2 to open the connecting chamber inlet 171. When the valve 2 is closed, the pushing member 31 needs to be pushed to move when the connecting cavity inlet 171 is closed, and the pushing member 31 can compress the compression spring 51 when moving, but the pushing member 31 can also realize abdicating for closing the valve 2 by pushing the compression spring 51 integrally.

As can be seen from the above, since the magnitude of the repulsive force accumulated in the compression spring 51 determines the degree of difficulty of compressing the compression spring 51 and the position of the compression spring 51 also determines the degree of difficulty of compressing the compression spring 51, the degree of difficulty of closing the valve 2 can be adjusted by adjusting the position of the compression spring 51 or the initial amount of elastic deformation of the compression spring, and the required pressure in the chamber when the driving valve 2 is closed can be adjusted.

Specifically, if the compression spring 51 has a large resilience accumulated before the valve 2 is pushed, the pushing force required when the valve 2 pushes the pushing member 31 to move in the direction of compressing the compression spring 51 is large, which requires a large air pressure to be accumulated in the first chamber 15. Accordingly, if the resilience force accumulated on the compression spring 51 is small, only a small air pressure is required at the end of the gate valve 2 away from the pushing member 31 to drive the pushing member 31 to compress the compression spring 51, so that the pushing member 31 moves to close the connecting chamber inlet 171 by the gate valve 2.

Therefore, the required air pressure for closing the valve 2 can be adjusted by the pre-accumulated resilient force of the compression spring 51, the pre-accumulated resilient force can be changed by changing the pre-deformation amount of the compression spring 51, and the adjustment can be performed by replacing the compression spring 51 with different types, which is inconvenient.

In another embodiment, the adjustment can be made by changing the position of the pushing member 31 without changing the pre-compression amount of the compression spring 51, if the pushing member 31 extends too far into the first chamber 15, i.e. the valve 2 is opened more, and if it is desired to close the connecting chamber inlet 171, more compression spring 51 is needed to change the pressure of the valve 2 needed to close the connecting chamber inlet 171.

It will be appreciated that the position of the pusher member 31 may be adjusted accordingly during the process of changing the pre-compression amount of the compression spring 51, although it is also possible to change only the pre-compression amount of the compression spring 51 without changing the pusher member 31. Likewise, the amount of precompression of the compression spring 51 when changing the position of the pusher member 31 is adjusted accordingly.

It should be noted that the adjustment of the precompression amount of the compression spring 51 refers to the amount of deformation of the compression spring 51 itself before the force acting on the push rod 31 during the movement of the valve 2 toward the closing direction of the connecting chamber inlet 171 when the valve 2 is closing the connecting chamber inlet 171 has not yet acted upon. The change in the compression and the amount of compression of the compression spring 51 changes the force required to further compress the compression spring 51 and thus also changes the air pressure required to push the valve 2 to close the connection chamber inlet 171, thereby accommodating different braking requirements.

In the embodiment, under the action of external force, the air valve 2 moves towards the direction of compressing the elastic expansion piece 5 and closes the conduction of the air inlet channel 11 and the air outlet channel 12; after the action of external force is cancelled, the elastic expansion piece 5 resets and moves, and the push piece 31 drives the air valve 2 to move towards the direction of conducting the air inlet channel 11 and the air outlet channel 12.

In order to conveniently realize adjustment, the brake valve buffer cavity pressure regulating mechanism is also provided with an adjusting mechanism 6 arranged on the shell 1; the adjusting mechanism 6 comprises an electric driving member 61 and an adjusting rod 62, the electric driving member 61 controls the adjusting rod 62 to move on the housing 1, the adjusting rod 62 cooperates with the elastic expansion member 5 to adjust the position of the elastic expansion member 5 when the adjusting rod 62 moves or adjust the amount of elastic deformation on the elastic expansion member 5 before an external force is applied, that is, to adjust the amount of elastic deformation on the elastic expansion member 5 when the pushing force of the valve 2 closing acts on the elastic expansion member 5.

In the present embodiment, the adjustment of the position of the pushing member 31 is actually realized by adjusting the position of the elastic expansion member 5, so that the opening size of the valve 2 is adjusted. The amount of elastic deformation before the elastic expansion element 5 is adjusted to exert an external force is actually the amount of precompression of the adjusted elastic expansion element 5, also called the amount of pre-deformation.

It is understood that the adjusting rod 62 may be a threaded post screwed to the housing 1 or a rod slidably disposed on the housing 1 in an axial direction of the adjusting rod 62. When the adjusting rod 62 is a threaded rod, the corresponding electric driving member 61 is a rotating motor, and when the adjusting rod 62 is a rod slidably disposed on the housing 1, the electric driving member 61 is an air cylinder disposed on the housing 1.

One end of the adjusting rod 62 abuts against the elastic telescopic piece 5, and one end of the elastic telescopic piece 5 far away from the adjusting rod 62 abuts against the pushing piece 31. Specifically, in the present embodiment, the adjustment lever 62 abuts against the compression spring 51, and in order to facilitate the engagement between the compression spring 51 and the adjustment lever 62, the elastic extensible member 5 further includes an adjustment lever support piece 52 disposed on the compression spring 51, the adjustment lever support piece 52 includes a support piece body 521 abutting against the compression spring 51 and a positioning groove 522 disposed on the support piece body 521 and recessed toward the center of the compression spring 51, and the adjustment lever 62 is disposed in the positioning groove 522 and abuts against the bottom of the positioning groove 522.

For more convenient operation, in this embodiment, the adjusting lever 62 is a threaded post that is threaded on the housing 1, the electric drive 61 includes a motor 611 and a motor output shaft 612, the adjusting lever 62 is threaded on the housing 1 and cooperates with the motor output shaft 612 to rotate synchronously with the motor output shaft 612, and the adjusting lever 62 slides relative to the motor output shaft 612 in the axial direction of the adjusting lever 62.

The adjustment of the position of the adjusting rod 62 on the housing 1 can be realized when the motor 611 rotates through the threaded connection, the adjustment of the position of the adjusting rod 62 on the housing 1 can change the position of the adjusting rod 62 extending at one end of the inner cavity 10, and the end of the adjusting rod 62 extending at the inner cavity 10 abuts against the elastic expansion piece 5, so that the position of the elastic expansion piece 5 or the pre-deformation amount of the elastic expansion piece 5 is adjusted when the position of the adjusting rod 62 on the housing 1 is adjusted.

In order to facilitate the output of the force for rotating the motor 611 to the adjustment lever 62, the adjustment mechanism 6 further includes a connecting sleeve 63 disposed between the motor output shaft 612 and the adjustment lever 62, and the connecting sleeve 63 is disposed to slide relative to at least one of the motor output shaft 612 and the adjustment lever 62 in the axial direction and to be circumferentially limited to each other.

The arrangement of the above structure enables the motor 611 to only transmit the rotating force, the motor 611 does not need to move back and forth along with the movement of the adjusting rod 62, and the motor 611 and the housing 1 can keep a relatively stable relationship, thereby better installing and setting the motor 611. In this embodiment, the motor 611 may be directly mounted and fixed on the housing 1, or the motor 611 and the housing 1 are mounted and fixed on a module housing together.

In a specific embodiment, the connecting sleeve 63 is a spline connecting sleeve fixed on the motor output shaft 612, and the adjusting rod 62 is provided with a spline shaft matched with the spline connecting sleeve.

In another embodiment, one end of the connecting sleeve 63 is fixed on the motor output shaft 612, the other end of the connecting sleeve 63 is provided with a limiting hole 630, the adjusting rod 62 is provided with a limiting post 621 matched with the limiting hole 630, and the cross section of the limiting post 621 is triangular, quadrangular, polygonal, irregular, semicircular or fan-shaped. Of course, in other embodiments, the positions of the limiting hole 630 and the limiting post 621 may be correspondingly interchanged, and the limiting post 621 and the connecting sleeve 63 are actually matched in a plugging manner, so that the two can relatively slide in the axial direction and only limit each other in the circumferential direction.

The brake valve buffer cavity pressure regulating mechanism further comprises a control system 7, wherein the control system 7 comprises an electric control unit electrically connected with the electric driving part 61 and a remote control unit electrically connected with the electric control unit, and the electric driving part 61 is controlled to rotate through the remote control unit. The remote control unit can be a remote controller or a mobile phone or an applet.

In the prior art, the position of the pushing member 31 is generally adjusted by manually screwing the adjusting rod 62 or the pre-compression condition of the compression spring 51 is adjusted, while the brake valve buffer chamber pressure adjusting mechanism is generally arranged beside the brake valve, and the brake valve is generally installed and fixed on the chassis of the vehicle, so that the adjustment of the adjusting rod 62 in the prior art requires the driver to drill to the bottom of the vehicle for adjustment, which causes inconvenience in operation.

In addition, the brake proportional brake performance of the brake valve under the existing condition is carried out under the condition that real-time data cannot be seen, namely blind adjustment, the randomness of the adjustment mode is higher than subjectivity, and adjustment data cannot be observed visually, so that adjustment disorder is easy to occur. Whether the braking force of the brake valve is adjusted in place or whether the braking force required by the driver and the driving road condition of the vehicle is adjusted is unknown, and the braking force is generally adjusted by professional technicians through professional detection equipment, so that great inconvenience is caused.

Thereby this embodiment drives adjusting lever 62 through setting up electric drive piece 61 and has conveniently realized the precompression deformation of elastic expansion piece 5 or the regulation of impeller 31 position, and then has adjusted the size of required atmospheric pressure when driving air valve 2 and closing, the convenient regulation that has realized the braking proportion and the braking performance of brake valve.

The remote control mode not only can be conveniently operated, but also can more clearly acquire the current braking state, and the current braking force can be fed back to the moving end, so that the current braking valve can be intuitively acquired through the moving end to be in an emergency braking state or a moderate braking state, and the braking valve can be better used.

In order to better realize control, the embodiment of the invention also discloses a control method of the brake valve buffer cavity pressure regulating mechanism, which comprises the following steps:

acquiring an adjusting instruction, wherein the adjusting instruction is sent out from a client;

controlling the motor 611 to rotate according to the adjustment instruction, wherein the motor 611 is used for driving an adjusting rod 62 on the brake valve buffer cavity pressure adjusting mechanism to rotate, the adjusting rod 62 moves along the axial direction during the rotation process to adjust the position of the elastic expansion piece 5 or adjust the elastic deformation amount of the elastic expansion piece 5, and the elastic expansion piece 5 is arranged in the brake valve buffer cavity pressure adjusting mechanism and is matched with the air valve 2 to conduct or close the passage into the buffer cavity 102; the buffer chamber 102 is provided in the brake valve 100 at a lower side of the brake piston 101, and the air pressure in the buffer chamber 102 serves to increase the downward movement resistance of the brake piston 101.

In this embodiment, "controlling the rotation of the motor 611 according to the adjustment command" specifically includes:

converting the adjustment instruction into a rotation angle of the motor 611;

the motor 611 is controlled to rotate according to the motor rotation angle.

The client is a mobile phone APP or an applet; when the client is a mobile phone APP or an applet, 'acquiring an adjustment instruction' comprises the following steps:

acquiring the position of an adjusting slider on a client screen; the adjusting slide block can be a virtual slide block on a program, and the position of the adjusting rod 62 is adjusted through the adjustment of the position of the virtual slide block;

judging whether the adjusting slide block moves along a preset track, and if the adjusting slide block moves along the forward direction of the preset track, acquiring the rotation angle of the motor along the forward direction; and if the adjusting slide block moves along the reverse direction of the preset track, acquiring the rotation angle of the motor along the reverse direction.

The predetermined track may be a straight-line adjusting slider sliding on the predetermined track for adjustment, the adjusting slider is located at the center of the predetermined track at the initial position, the motor 611 is controlled to rotate in the forward direction when the adjusting slider moves towards the left side of the predetermined track, and the motor 611 is controlled to rotate in the reverse direction when the adjusting slider moves towards the right side of the predetermined estimate. The position of the adjusting slider on the predetermined track corresponds to the rotation angle of the motor 611, so that the rotation angle of the motor 611 can be controlled according to the adjustment of the adjusting slider.

Of course, in other embodiments, the predetermined track may be a circle, and the adjustment slider may be a pointer that rotates circumferentially around the center of the circle.

In this embodiment, "obtaining the angle of rotation of the motor in the forward direction" includes the following steps:

acquiring the moving distance L1 of the adjusting slide block along the forward direction of the preset track;

calculating the proportion of the moving distance L1 in the total adjustable range of the preset track, and determining the rotation angle of the motor along the forward direction according to the proportion; wherein, the distance from the center of the predetermined track to the end point of the positive direction corresponds to the maximum angle of the motor rotating along the positive direction.

The same "obtaining the angle of rotation of the motor in the reverse direction" includes the following steps:

acquiring the moving distance L1 of the adjusting slide block along the reverse direction of the preset track;

calculating the proportion of the moving distance L1 in the total adjustable range of the preset track, and determining the rotation angle of the motor in the reverse direction according to the proportion; wherein a distance from a center of the predetermined trajectory to an end point of the reverse direction corresponds to a maximum angle of rotation of the motor in the reverse direction.

The adjusting slider adjusts the rotation angle of the motor according to the sliding distance in proportion to the whole predetermined track, and it should be noted that the relationship between the end point of the predetermined track and the rotation angle of the motor can be established according to actual needs, that is, the end point of the predetermined track does not necessarily represent the maximum rotation angle of the motor, but represents the maximum adjustable angle of the motor.

In this embodiment, for better adjustment, the motor 611 is a stepping motor, and the stepping motor rotates by a certain angle in a specific direction after receiving a signal, so that different gears can be set for control adjustment, and thus better operation and control can be achieved.

The "acquiring the angle of rotation of the motor in the forward direction" when the motor 611 is a stepping motor includes the steps of:

dividing a plurality of adjusting positions towards the positive direction along the center of a preset track;

judging that the adjusting slide block moves from the initial position along the positive direction by a plurality of adjusting positions; and determining the rotation angle of the motor in the forward direction according to the number of the moved adjusting positions, wherein one adjusting position corresponds to the rated rotation angle of the motor.

The setting and adjusting position is equivalent to the limited adjusting range of the motor, can be adjusted only at a plurality of limited angles, can not realize stepless adjustment, but can more conveniently realize the transmission of signals and the setting of a system.

In the specific embodiment, the description is given by taking the stepping motor control as an example, and the specific adjustment process is as follows: firstly, adjusting the movement of an adjusting slide block according to a client, such as a mobile phone or an applet or a feedback graph of the braking performance on an APP operation interface, and sending a command to a circuit driver (such as a control panel singlechip) for controlling an electric driving part 61 by using the data of the movement of the slide block through Bluetooth; the circuit driver sends a pulse signal to the electric driving member 61 such as a stepping motor according to the moving end instruction, so that the stepping motor rotates according to the preset rotation angle and speed.

When the circuit driver receives a pulse signal, it drives the stepping motor to rotate by a fixed angle in a set direction, the fixed angle is called "step angle", and the rotation of the stepping motor runs by the fixed angle. Therefore, the angular displacement can be controlled by controlling the number of pulses, the rotating speed and acceleration of the stepping motor can be controlled by controlling the pulse frequency, the stepping motor rotates one step before rotating one angle, the output angular displacement is in direct proportion to the input pulse number, and the rotating speed is in direct proportion to the pulse frequency.

The stepping motor can be controlled to rotate reversely by changing the sequence of the energization of the windings. Therefore, the rotation of the stepping motor can be controlled by controlling the pulse number, the frequency and the energizing sequence of each phase winding of the motor, for example, when the rotation angle of the stepping motor is set to be 90 degrees, the motor output shaft 612 of the stepping motor rotates and drives the adjusting rod 62 to rotate through the connecting sleeve 63, and the adjusting rod 62 synchronously rotates for 90 degrees.

In this embodiment, it can be set that the step motor adjusting adjustment rod 62 rotates clockwise, and at this time, the adjustment rod 62 controls the compression spring 51 to compress or drives the pushing member 31 to move toward the valve 2 to open the valve 2. The opening of the valve 2 allows the gas pressure in the first chamber 15 to enter the connecting chamber 17, and the gas inlet channel 11 and the gas outlet channel 12 are communicated.

The air inlet channel 11 and the air outlet channel 12 are communicated, so that air pressure can be conveyed into a buffer cavity 102 below a brake piston 101 of the brake valve 100, the brake piston 101 is forced to move downwards to slow down by acting force on the brake piston 101, and the pressure output proportion of the brake piston 101 due to the force bearing area is decomposed.

When the air pressure in the first chamber 15 increases, the air valve 2 is pushed to move in a direction of closing the connecting chamber inlet 171, and the pushing member 31 is driven to move in a direction of compressing the compression spring 51. Each 90 degrees clockwise rotation of the stepper motor increases the pressure in the buffer chamber 102 by 0.03 atmospheres, and correspondingly, the pressure in the first chamber 15 required to push the gate valve 2 to close the connecting chamber inlet 171 is correspondingly greater.

Correspondingly, when the adjustment lever 62 is rotated counterclockwise by rotating the stepping motor counterclockwise, the compression spring 51 is stretched or the pushing member 31 moves away from the gate valve 2, so that the spring can be compressed with a small force when the compression spring 51 is stretched, and at this time, the pushing force required by the pushing member 31 to compress the spring is correspondingly reduced, and the air pressure in the first chamber 15 required to indirectly push the gate valve 2 to close the connecting chamber inlet 171 is also reduced.

In another embodiment of the present invention, there is also disclosed a brake valve assembly comprising: the brake valve comprises a brake valve 100 and the brake valve buffer cavity pressure regulating mechanism, wherein the brake valve buffer cavity pressure regulating mechanism can be directly and fixedly formed on the brake valve, and of course, the brake valve buffer pressure regulating mechanism can also be arranged into an independent unit which is communicated with an interface on the brake valve through a pipeline.

The brake valve comprises a valve body and a brake piston 101 arranged in the valve body in a sliding mode, wherein a driving cavity 107 located above the brake piston 101, a buffer cavity 102 located on the lower side of the brake piston 101 and a brake cavity 104 are formed in the valve body; the brake chamber 104 communicates with the air inlet passage 11, and the buffer chamber 102 communicates with the air outlet passage 12.

An expansion cavity 13 and a control channel 14 communicated with the expansion cavity 13 are further arranged on the inner upper portion of the shell of the brake valve buffering cavity pressure regulating mechanism, and the control channel 14 is communicated with the driving cavity 107.

The brake valve 100 is also internally provided with an air storage cavity 106 and an air valve for communicating the air storage cavity 106 with the brake cavity 104, and the brake valve 100 is also provided with a brake air valve 103 which is movable in the air storage cavity 104 and is used for sealing the air valve; a brake piston push rod 108 is arranged on the side of the brake piston 101 facing away from the drive chamber 107, and the brake piston push rod 108 is used for pushing the brake valve 103 to move towards the valve opening direction.

When the brake pedal is stepped on in the braking process, the air pressure of the air outlet pipe of the brake master cylinder enters the driving cavity 107, the air pressure in the driving cavity 107 is increased to push the brake piston 101 to move towards the direction of the brake valve 103 so as to open the brake valve 103, and the brake valve 103 is opened to conduct a brake circuit. Therefore, the air pressure stored in the air outlet cavity 106 is released into the brake cavity 104, on one hand, the air in the brake cavity 104 enters the corresponding part to generate brake, on the other hand, the air in the brake cavity 104 enters the buffer cavity 102 through the air inlet channel 11 and the air outlet channel 12, and further the air pressure in the buffer cavity 102 is filled. The amount of air pressure filled in the buffer chamber 102 can be used for adjusting the downward moving speed of the brake piston 101, thereby influencing the sensitivity of the brake.

When the air pressure in the drive chamber 107 is reduced after the brake is released, the brake piston 101 moves in a reset manner, and the brake valve 103 moves in a reset manner under the action of a reset mechanism to close the brake circuit to release the brake.

The large truck in the prior art adopts an air brake system, which has many disadvantages, and the braking force required by the large truck in the no-load state and the heavy load state is different, so that the requirements on the braking device are different, and the situation that the braking device reacts too sensitively and responds too timely to cause tire locking in the light load state is avoided as much as possible. Under the heavy load state, the brake device is required to respond in time to avoid the situation that the vehicle cannot be braked due to the unsatisfactory braking effect.

A buffer cavity pressure regulating mechanism is arranged for regulating air pressure in the buffer cavity 102, air pressure in the first cavity 15 is increased by increasing air pressure in the brake cavity 104, the air pressure in the first cavity 15 is increased to the extent that the air pressure in the first cavity 15 can push the valve 2 to push the pushing piece 31 to overcome the acting force of the compression spring 51 and then move, the air pressure entering the buffer cavity 102 from the air inlet channel 11 can be closed, then the driving cavity 107 enters the expansion cavity 13 through the control channel 14 when the air pressure in the driving cavity 107 is increased to increase the air pressure in the expansion cavity 103, the pushing piece 31 is pushed to further move towards the direction far away from the valve 2 after the air pressure in the expansion cavity 103 is increased, and therefore the air outlet channel 12 and the pressure relief channel 32 are conducted to unload the air pressure in the buffer cavity 102.

That is, the air pressure in either the drive chamber 107 or the brake chamber 104 can only be relieved after a certain threshold of movement is reached, thereby allowing adjustment of the brake valve actuation.

However, the movement thresholds that may be required by different vehicles according to their own use states are different. Therefore, in order to meet the requirements of different users, an adjusting rod 62 is further arranged at one end of the compression spring 51, and the adjusting rod can change the expansion amount of the compression spring 51 so as to change the acting force of the compression spring 51 on the pushing piece 31, further change the position of the pushing piece 31, or change the precompression amount or deformation amount of the compression spring 51 so as to change the pressure value for driving the valve 2 to move to close the connecting cavity inlet 171, and also change the pressure value for pushing the pushing piece 31 to move away from the valve 2 in the expansion cavity 32.

Above-mentioned structure has following defect, can only adjust through adjusting regulation pole 62, and this kind of adjustment mode randomness is great more subjectivity to cushion chamber pressure regulating mechanism generally sets up on brake valve, consequently often needs the user to climb to the vehicle bottom and adjusts and has brought the inconvenience for the use, and because of can not the visual observation adjustment data alignment confusion easily, still needs professional detection equipment adjustment, causes very big inconvenience moreover.

In order to solve the above technical problem, the brake of the embodiment of the present invention is equipped with the above brake valve buffer chamber pressure regulating mechanism, the brake valve buffer chamber pressure regulating mechanism includes the adjusting mechanism 6 for controlling the movement of the adjusting rod 62, the adjusting mechanism 6 is equipped with the electric driving member 61, the movement of the adjusting rod 62 can be better controlled by the electric driving member such as the click 611, and the current braking state of the brake valve can be intuitively reflected.

In the above embodiment, the air source for filling the buffer cavity 102 with air pressure comes from the brake cavity 104, in other embodiments, the air pressure in the buffer cavity 102 may be supplied by the driving cavity 107, that is, the air source for supplying air is the driving cavity 107, at this time, the air inlet end of the air inlet channel needs to be communicated to the driving cavity 107, and an additional mouthpiece may be disposed on the driving cavity 107 to facilitate connection. The air pressure in the drive chamber 107 provides the air pressure required to pressurize the buffer chamber 102. The advantage of this design is that the maximum air pressure in the buffer chamber 102 can only reach the air pressure in the drive chamber 107, and in the event of a failure of the control device, the air pressure in the buffer chamber 102 will not be too great to exceed the air pressure in the drive chamber 107, which may affect the braking of the brake device.

Of course, in another embodiment, the brake valve further has a master cylinder outlet pipe which is communicated with the driving cavity 107 and supplies air pressure to the driving cavity 107, the air pressure supplied to the buffer cavity 102 through the master cylinder outlet pipe as an air supply source is equivalent to the air pressure supplied to the buffer cavity 102 through the driving cavity 107, and because the air pressure in the driving cavity 107 is from the master cylinder outlet pipe, the problem that the air pressure in the buffer cavity 102 is too high does not occur.

In other embodiments, the gas supply source is an external gas cylinder. The problem that exists in this scheme that the air pressure in cushion chamber 102 supplies air through independent air intake system, can external air receiver on the frame may be that the executor 44 of needs has better sensitivity, avoids appearing the condition that the atmospheric pressure in cushion chamber 102 exceedes the atmospheric pressure in drive chamber 107 and appears.

In another embodiment, the source of supply air may also be a trailer valve outlet when the brake is applied to a relay valve in a brake system on a trailer. The air pressure vented through the trailer valve is the source of the supply air to the buffer chamber 102.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims

1. A brake valve cushion chamber pressure regulating mechanism comprising:

2. The brake valve cushion chamber pressure regulating mechanism of claim 1, wherein the push member abuts the valve when the push member is in the closed position;

3. The brake valve cushion chamber pressure regulating mechanism of claim 2, wherein the urging member includes a piston portion slidably disposed in the inner chamber, a portion of the piston portion forming an inner wall of the expansion chamber, the piston portion moving in a direction to increase a volume of the expansion chamber when a pressure of air in the expansion chamber increases;

the pushing piece is also provided with a push rod arranged on the piston part, the push rod extends towards the valve and is used for abutting against the valve so as to push the valve to move towards a second position;

4. The brake valve cushion chamber pressure regulating mechanism of claim 3, wherein said pressure relief passage includes a pressure relief inlet, a pressure relief outlet and a pressure relief connection hole; the pressure relief inlet is arranged on one side of the push rod facing the air valve; the pressure relief outlet is arranged on one side of the piston part, which is far away from the push rod; the pressure relief connecting hole penetrates through the push rod and the piston part and is communicated with the pressure relief inlet and the pressure relief outlet.

5. The brake valve cushion chamber pressure regulating mechanism according to claim 4, wherein the inner chamber includes a first chamber, a second chamber, and a connecting chamber that communicates the first chamber with the second chamber; the air inlet channel is communicated with the first cavity, and the air outlet channel is communicated with the connecting cavity; the connecting chamber having a connecting chamber inlet disposed on the first chamber sidewall;

6. The brake valve cushion chamber pressure regulating mechanism of claim 5, wherein the valve is clearance fit with an inner wall of the first chamber;

the air inlet channel is provided with an air inlet channel outlet arranged on the inner wall of the first cavity, and the valve is movably arranged between the air inlet channel outlet and the connecting cavity inlet; the air valve is pushed by air pressure and moves towards the direction of closing the connecting cavity inlet when the air pressure of the first cavity is increased, and the air valve is pushed by the pushing piece to move towards the direction of opening the connecting cavity inlet when the air pressure of the first cavity is reduced;

7. The brake valve buffer cavity pressure regulating mechanism according to claim 5, wherein the piston portion is slidably disposed in the second cavity, a seal ring is disposed between the piston portion and an inner wall of the second cavity, a pressure relief buffer cavity is formed between a side of the piston portion away from the push rod and the inner wall of the second cavity, the housing further has a pressure relief hole communicated with the pressure relief buffer cavity, and the pressure relief channel is communicated with the pressure relief buffer cavity;

8. A brake valve assembly including a brake valve and a brake valve cushion chamber pressure regulating mechanism as claimed in any one of claims 1 to 7, said brake valve including a valve body and a brake piston slidably disposed within said valve body, said valve body having a drive chamber therein above said brake piston and a cushion chamber therein below said brake piston, said brake chamber; the brake cavity is communicated with the air inlet channel, and the buffer cavity is communicated with the air outlet channel.

9. The brake valve assembly of claim 8, wherein the housing further includes an expansion chamber thereon and a control passage in communication with the expansion chamber, the control passage being in communication with the actuation chamber.

10. The brake valve assembly of claim 8, further comprising an air reservoir and an air valve communicating the air reservoir with the brake chamber, the brake valve further comprising a brake valve movable within the air reservoir for closing the air valve; and a brake piston push rod is arranged on one side of the brake piston, which deviates from the driving cavity, and is used for pushing the brake air valve to move towards the direction of opening the air valve.