CN216467727U

CN216467727U - Hand brake valve capable of automatically cutting off air source

Info

Publication number: CN216467727U
Application number: CN202122456894.3U
Authority: CN
Inventors: 姜德政; 丁乔; 邱国光
Original assignee: ZF Commercial Vehicle Systems Qingdao Co Ltd
Current assignee: ZF Commercial Vehicle Systems Qingdao Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-05-10
Anticipated expiration: 2031-10-13

Abstract

The utility model discloses a hand brake valve capable of automatically cutting off an air source, which comprises a shell, wherein a stop valve cavity and a valve cavity are arranged on the shell; a stop valve is arranged in the stop valve cavity; when the top of the valve element of the stop valve moves upwards or downwards, the air passage between the first air inlet and the first air outlet can be cut off or communicated; a brake valve piece is arranged in the valve cavity, the top of the brake valve piece is attached to the cam, and the cam is provided with an operating handle; when the top of the valve member of the brake valve moves upwards or downwards, the air passage between the second air inlet and the second air outlet can be communicated or cut off. According to the utility model, the stop valve cavity is arranged between the air inlet and the valve cavity, and even if the control handle is in a false locking state and can automatically rebound to the driving position, the stop valve controls the air passage between the air inlet and the valve cavity to be cut off, so that the air source passage of the valve cavity is cut off, and the stability of the parking function is ensured.

Description

Hand brake valve capable of automatically cutting off air source

Technical Field

The utility model belongs to the technical field of automobile brake valves, and particularly relates to a manual brake valve capable of automatically cutting off an air source.

Background

The hand brake valve is mainly used for controlling parking brake of an automobile, the existing hand brake valve usually adopts an air brake mode, namely compressed air enters a valve cavity through an air inlet of the hand brake valve, and an operating handle of the hand brake valve is moved to a driving position or a parking position to control the on-off of an air path between the valve cavity and an air outlet, so that driving control or brake control is realized. When the vehicle is driven, the gas circuit between the valve cavity and the gas outlet is communicated, gas enters the spring cavity of the brake chamber through the gas outlet, the parking spring is in a compressed state under the action of air pressure, and the vehicle is braked; when the vehicle is parked, the air path between the valve cavity and the air outlet is cut off, air cannot enter the spring cavity of the brake air chamber through the air outlet, the parking spring is in a free stretching state, and the parking brake of the vehicle is realized.

The parking function of the hand brake valve is stable and depends on the operation handle to be maintained in a parking position and is not moved, the prior art scheme adopts a form of a thrust block and a locking groove, and the thrust block falls into the locking groove in the parking position (locking position), so that the operation handle is fixed at a specific angle, and the parking function is realized. When the parking is released and the vehicle returns to the running position, the handle needs to be pulled upwards to pull the thrust block out of the locking groove, the handle is operated to return to the running position, and the parking of the vehicle is released.

In the long-term use process, irregular abrasion can occur on the thrust block, so that a 'false locking' state can occur, the 'false locking' state means that the thrust block does not completely fall into the locking groove, so that the locking position is unstable, and at the moment, the handle stays at the parking position, but under the condition of slight external force or vehicle body vibration, the operating handle automatically returns to the driving position. Under this kind of state, can take place to swift current the car and cause the traffic accident, threaten the life health safety of passenger and the outer personnel of car on the car.

Therefore, the prior art is in need of further improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a hand brake valve capable of automatically cutting off an air source.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a hand brake valve capable of automatically cutting off an air source comprises a shell, wherein the bottom of the shell is provided with an air inlet and an air outlet;

the shell is provided with a stop valve cavity and a valve cavity;

the first air inlet of the valve cavity of the stop valve is communicated with the air inlet, the first air outlet of the valve cavity of the stop valve is communicated with the second air inlet of the valve cavity, and the second air outlet of the valve cavity is communicated with the air outlet;

a stop valve is arranged in the stop valve cavity; the top of the stop valve is provided with an actuating assembly; when the top of the stop valve moves upwards or downwards, the air passage between the first air inlet and the first air outlet can be cut off or communicated;

a brake valve piece is arranged in the valve cavity, the top of the brake valve piece is attached to the cam, an operating handle is assembled on the cam, and the top of the brake valve piece moves up and down when the operating handle controls the cam to rotate;

when the top of the brake valve member moves upwards or downwards, the communication or the cut-off of the air passage between the second air inlet and the second air outlet can be realized;

the operating handle controls the top of the brake valve member to move downwards to cut off the air passage between the second air inlet and the second air outlet through the cam, and the actuating assembly controls the top of the stop valve member to move upwards to cut off the air passage between the first air inlet and the first air outlet.

Preferably, a first communicating channel for communicating the air inlet and the first air inlet and a second communicating channel for communicating the first air outlet and the second air inlet are arranged in the shell.

Preferably, the valve cavity of the stop valve comprises a sliding cavity, a first air outlet cavity and a first air inlet cavity which are coaxially arranged and sequentially increased in diameter from top to bottom;

the first air inlet is arranged on the side wall of the first air inlet cavity, and the first air outlet is arranged on the side wall of the first air outlet cavity;

said shutoff valve member including an actuator rod; the actuating rod is in sliding fit with the sliding cavity, and the top end of the actuating rod penetrates out of the sliding cavity upwards; the actuating rod is provided with a piston at the bottom end of the first air inlet cavity, and the diameter of the piston is larger than that of the first air outlet cavity and smaller than that of the first air inlet cavity;

the bottom end of the piston presses against the stop valve reset assembly, and the stop valve reset assembly comprises an upper spring seat, a lower spring seat and a reset spring positioned between the upper spring seat and the lower spring seat; the upper spring seat is in sliding fit with the first air inlet cavity, and the lower spring seat is fixedly arranged at the bottom end of the valve cavity of the stop valve.

Preferably, the inner side walls of the top end and the bottom end of the sliding cavity are embedded with sliding cavity sealing rings;

an air inlet cavity sealing ring is embedded on the inner side wall of the bottom end of the first air inlet cavity.

Preferably, a buffer spring is arranged in the first air outlet cavity and sleeved on the actuating rod.

Preferably, the valve cavity comprises a second air inlet cavity provided with a second air inlet and a second air outlet cavity provided with a second air outlet;

the brake valve member comprises an upper piston, a lower piston and a connecting rod; a valve is arranged between the inner parts of the upper piston and the lower piston, and the connecting rod sequentially penetrates through the upper piston, the valve and the lower piston;

the bottom end of the connecting rod is fixedly provided with an actuating part, the actuating part is positioned at the lower part of the valve, and the outer diameter of the actuating part is larger than the inner diameter of the bottom end of the valve;

the top of the connecting rod is fixedly connected with the ejector rod, and the top end of the ejector rod is attached to the cam; a jacking component used for enabling the top end of the ejector rod to be pressed against the cam all the time is arranged in the valve cavity;

the upper part of the valve cavity is provided with a sleeve which is in sliding fit with the ejector rod;

a balance spring is arranged in the outer side wall of the sleeve and the upper piston;

when the top of the ejector rod moves upwards, the valve communicates the air path between the second air inlet cavity and the second air outlet cavity; when the top of the ejector rod moves downwards, the air path between the second air inlet cavity and the second air outlet cavity is cut off by the valve.

Preferably, the outer side wall of the upper part of the upper piston is in sealing fit with the inner wall of the second air inlet cavity through a first upper piston sealing ring, and the inner side wall of the lower part of the upper piston is in sealing fit with the outer wall of the valve through a second upper piston sealing ring;

the outer side wall of the lower part of the upper piston is in threaded connection with the inner side wall of the upper part of the lower piston;

the outer side wall of the lower part of the lower piston is in sealing fit with the inner wall of the second air outlet cavity through a lower piston sealing ring;

the inner side wall of the sleeve is in sealing fit with the outer side wall of the ejector rod through an ejector rod sealing ring;

and the outer side wall of the bottom end of the actuating part is in sealing fit with the inner wall of the second air outlet cavity through a connecting rod sealing ring.

Preferably, the outer side wall of the lower part of the lower piston is provided with a plurality of piston air inlets which enable the inner cavity of the lower piston to be communicated with the second air inlet cavity;

an annular communication cavity for communicating an inner cavity of the lower piston with a second air outlet cavity is reserved between the inner side wall of the bottom end of the lower piston and the outer side wall of the actuating part;

when the top of the ejector rod moves upwards, the valve opens the annular communicating cavity; when the top of the ejector rod moves downwards, the valve seals the annular communicating cavity.

Preferably, the jacking assembly comprises a first spring and a second spring;

the top end of the first spring is pressed to the actuating part, and the bottom end of the first spring is fixedly arranged at the bottom end of the valve cavity;

the second spring is positioned in the sleeve and the valve, and is sleeved on the ejector rod; the top end of the second spring presses the ejector rod, and the bottom end of the second spring presses the valve.

Preferably, the actuation assembly comprises an arcuate actuation arm;

the shell is provided with an installation seat, and the arc-shaped actuating arm is rotationally connected with the installation seat;

a tension spring is arranged at the bottom of the arc-shaped actuating arm between the actuating rod and the mounting seat, and the bottom end of the tension spring is fixedly connected with the shell;

the top end of the actuating rod is fixedly connected with an actuating plate;

a pressing plate is arranged at one end of the cam facing the arc-shaped actuating arm;

when the operating handle drives the cam to rotate to the parking position from the driving position, the pressure plate can press one end of the arc-shaped actuating arm, so that the other end of the arc-shaped actuating arm is pressed upwards to the bottom end of the actuating plate to drive the actuating rod to move upwards.

The utility model has the beneficial effects that:

according to the utility model, the stop valve cavity is arranged between the air inlet and the valve cavity, the stop valve is arranged in the stop valve cavity, and the air passage between the air inlet and the valve cavity can be cut off or communicated when the stop valve moves upwards or downwards; when the control handle moves from the driving position to the parking position, the stop valve member can cut off the air passage between the valve cavity and the air inlet. Therefore, even if the control handle is in a false locking state and can automatically rebound to the driving position at the moment, the stop valve controls the air passage between the air inlet and the valve cavity to be cut off, so that the air source passage of the valve cavity is cut off, the parking function is stable, and the sliding accident is avoided

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a first schematic perspective view of a hand brake valve of the present invention capable of automatically shutting off the air supply;

FIG. 2 is a schematic perspective view of a second embodiment of the hand brake valve of the present invention capable of automatically shutting off the air supply;

FIG. 3 is a schematic top view of the hand brake valve of the present invention capable of automatically shutting off the air supply;

FIG. 4 is a sectional view taken along line A-A of FIG. 3;

FIG. 5 is a sectional view taken along line B-B of FIG. 3;

FIG. 6 is a bottom view of the hand brake valve of the present invention with an automatic air supply shutoff;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 6;

FIG. 8 is a first schematic structural view of a lower housing according to the present invention;

FIG. 9 is a second schematic structural view of the lower housing of the present invention;

FIG. 10 is a schematic view of the construction of the cam of the present invention;

FIG. 11 is a schematic view of the construction of the lower piston of the present invention;

wherein:

1-lower shell, 11-air inlet, 12-air outlet, 13-first communicating channel, 14-second communicating channel, 141-second communicating groove, 142-cavity and 15-mounting seat;

2-stop valve cavity, 21-first air inlet, 22-first air outlet, 23-sliding cavity, 231-sliding cavity sealing ring, 24-first air outlet cavity, 25-first air inlet cavity, 251-air inlet cavity sealing ring;

3-valve cavity, 31-second air inlet, 32-second air outlet, 33-second air inlet cavity, 34-second air outlet cavity and 35-sleeve;

4-cam, 41-pressing plate, 42-cam shell, 5-operating handle and 6-upper shell;

71-actuating rod, 711-piston, 712-actuating plate, 72-upper spring seat, 73-lower spring seat, 74-return spring, 75-buffer spring;

81-upper piston, 811-first upper piston sealing ring, 812-second upper piston sealing ring, 82-lower piston, 821-lower piston sealing ring, 822-lower piston inner cavity, 823-piston air inlet hole, 824-annular communicating cavity, 83-valve, 84-connecting rod, 841-connecting rod sealing ring, 842-actuating part, 85-ejector rod 851, ejector rod sealing ring, 86-balance spring, 87-first spring and 88-second spring;

91-arc actuating arm, 92-tension spring.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In the present invention, terms such as "upper", "lower", "bottom", "top", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only terms of relationships determined for convenience in describing structural relationships of the components or elements of the present invention, and do not particularly indicate any components or elements of the present invention, and are not to be construed as limiting the present invention.

In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.

The utility model is further illustrated with reference to the following figures and examples.

As shown in fig. 1-2, a hand brake valve capable of automatically cutting off an air source comprises a housing, wherein the bottom of the housing is provided with an air inlet 11 and an air outlet 12;

the shell is provided with a stop valve cavity 2 and a valve cavity 3;

the first air inlet 21 of the stop valve cavity 2 is communicated with the air inlet 11, the first air outlet 22 of the stop valve cavity 2 is communicated with the second air inlet 31 of the valve cavity 3, and the second air outlet 32 of the valve cavity 3 is communicated with the air outlet 12;

a stop valve is arranged in the stop valve cavity 2; the top of the stop valve is provided with an actuating assembly; when the top of the stop valve moves upwards or downwards, the air passage between the first air inlet 21 and the first air outlet 22 can be cut off or communicated;

a brake valve member is arranged in the valve cavity 3, the top of the brake valve member is attached to a cam 4, and an operating handle 5 is assembled on the cam 4; specifically, the cam 4 is rotatably fitted in a cam housing 42, the cam housing 42 being fixedly provided at an upper portion of the housing; when the operating handle 5 controls the cam 5 to rotate, the top of the valve piece of the brake valve moves up and down;

when the top of the valve member of the brake valve moves upwards or downwards, the communication or the cut-off of the air passage between the second air inlet 31 and the second air outlet 32 is realized;

the operating handle 5 controls the brake valve member top to move downwards to cut off the air passage between the second air inlet 31 and the second air outlet 32 through the cam 5, and the actuating assembly controls the stop valve member top to move upwards to cut off the air passage between the first air inlet 21 and the first air outlet 22.

Preferably, as shown in fig. 8-9, a first communication channel 13 communicating the air inlet 11 and the first air inlet 21 and a second communication channel 14 communicating the first air outlet 22 and the second air inlet 31 are arranged in the housing;

specifically, the shell comprises a lower shell 1 and an upper shell 6 which are fixedly connected up and down; wherein, the air inlet 11 and the air outlet 12 are arranged on the lower shell 1; the first communicating channel 13 is provided on the lower case 1, and the second communicating channel 14 is composed of a second communicating groove 141 on the lower case 1 and a cavity 142 between the upper case 6 and the lower case 1.

Preferably, as shown in fig. 3-5, the check valve cavity 2 includes a sliding cavity 23, a first outlet cavity 24, and a first inlet cavity 25, which are coaxially arranged and have diameters that become larger from top to bottom;

the first air inlet 21 is arranged on the side wall of the first air inlet cavity 25, and the first air outlet 22 is arranged on the side wall of the first air outlet cavity 24;

the shutoff valve member includes an actuator rod 71; the actuating rod 71 is in sliding fit with the sliding cavity 23, and the top end of the actuating rod 71 penetrates out of the sliding cavity 23 upwards; the actuating rod 71 is provided with a piston 711 at the bottom end of the first air inlet cavity 25, and the diameter of the piston 711 is larger than that of the first air outlet cavity 24 and smaller than that of the first air inlet cavity 25;

the bottom end of the piston 711 presses against a stop valve return assembly, which includes an upper spring seat 72, a lower spring seat 73, and a return spring 74 located between the upper spring seat 72 and the lower spring seat 73; the upper spring seat 72 is in sliding fit with the first air inlet chamber 25, and the lower spring seat 73 is fixedly arranged at the bottom end of the stop valve chamber 2.

When the actuating rod 71 moves upwards to the piston 711 to block the bottom port of the first air outlet cavity 24, the first air inlet cavity 25 is not communicated with the first air outlet cavity 24, so that the air path between the first air inlet 21 and the first air outlet 22 is cut off;

when the actuating rod 71 moves downwards until the piston 711 is not blocking the bottom port of the first air outlet cavity 24, the first air inlet cavity 25 is communicated with the first air outlet cavity 24, so that the air passages between the first air inlet 21 and the first air outlet 22 are communicated; meanwhile, when the actuation rod 71 moves downward, the piston 711 presses the upper spring seat 72 to press the upper spring seat 72 downward to compress the return spring 74, and when the actuation rod 71 loses the external force of pressing down or no air flows between the first air inlet chamber 25 and the first air outlet chamber 24, the actuation rod 71 is reset upward by the return spring 74.

Preferably, as shown in fig. 4-5, sliding chamber sealing rings 231 are embedded on the inner side walls of the top end and the bottom end of the sliding chamber 23, so as to ensure that gas does not overflow from the sliding chamber 23;

an air inlet cavity sealing ring 251 is embedded on the inner side wall at the bottom end of the first air inlet cavity 25 to ensure that air cannot overflow from the first air inlet cavity 25.

Preferably, as shown in fig. 4-5, a buffer spring 75 is disposed in the first outlet chamber 24, and the buffer spring 75 is sleeved on the actuating rod 71. The damping spring 75 is provided to counteract a part of the upward pressure of the return spring 74, so that the force can be saved when the actuating rod 71 is pressed down, and the return spring 74 can damp the piston 711 when the actuating rod 71 is restored.

Preferably, as shown in fig. 6-7, the valve cavity 3 includes a second inlet cavity 33 provided with a second inlet 31, and a second outlet cavity 34 provided with a second outlet 32;

the brake valve member comprises an upper piston 81, a lower piston 82 and a connecting rod 84; a valve 83 is arranged between the inner parts of the upper piston 81 and the lower piston 82, and the connecting rod 84 sequentially penetrates through the upper piston 81, the valve 83 and the lower piston 82;

an actuating part 842 is fixedly arranged at the bottom end of the connecting rod 84, the actuating part 842 is positioned at the lower part of the valve 83, and the outer diameter of the actuating part 842 is larger than the inner diameter of the bottom end of the valve 83;

the top of the connecting rod 84 is fixedly connected with a top rod 85, and the top end of the top rod 85 is attached to the cam 4; a jacking component used for enabling the top end of the ejector rod 85 to be pressed against the cam 4 all the time is arranged in the valve cavity 3;

the upper part of the valve cavity 3 is provided with a sleeve 35 which is in sliding fit with the mandril 85;

a balance spring 86 is arranged between the outer side wall of the sleeve 35 and the interior of the upper piston 81;

when the top of the ejector rod 85 moves upwards, the valve 83 communicates the air path between the second air inlet cavity 33 and the second air outlet cavity 34; when the top of the push rod 85 moves downwards, the valve 83 cuts off the air path between the second air inlet cavity 33 and the second air outlet cavity 34.

Preferably, as shown in fig. 7, the upper outer side wall of the upper piston 81 is in sealing fit with the inner wall of the second air inlet chamber 33 through a first upper piston sealing ring 811, and the lower inner side wall of the upper piston 81 is in sealing fit with the outer wall of the valve 83 through a second upper piston sealing ring 812;

the lower outer side wall of the upper piston 81 is in threaded connection with the upper inner side wall of the lower piston 82;

the lower outer side wall of the lower piston 82 is in sealing fit with the inner wall of the second air outlet cavity 34 through a lower piston sealing ring 821;

the inner side wall of the sleeve 35 is in sealing fit with the outer side wall of the ejector rod 85 through an ejector rod sealing ring 851;

the outer side wall of the bottom end of the actuating part 842 is in sealing fit with the inner wall of the second air outlet cavity 34 through a connecting rod sealing ring 841;

the sealing rings are arranged to ensure the air tightness of the second inlet cavity 33 and the second outlet cavity 34.

Preferably, as shown in fig. 11, a plurality of piston intake holes 823 for communicating the lower piston inner cavity 822 with the second intake cavity 33 are formed on the lower outer side wall of the lower piston 82;

as shown in fig. 7, an annular communication cavity 824 is left between the inner side wall of the bottom end of the lower piston 82 and the outer side wall of the actuating portion 842 for communicating the lower piston inner cavity 822 with the second outlet cavity 34;

when the top of the top rod 85 moves upwards, the valve 83 opens the annular communicating cavity 824; when the top of the push rod 85 moves downwards, the valve 83 blocks the annular communicating cavity 824.

Preferably, as shown in fig. 7, the tightening assembly includes a first spring 87, a second spring 88;

the top end of the first spring 87 presses against the actuating part 842, and the bottom end of the first spring 87 is fixedly arranged at the bottom end of the valve cavity 3;

the second spring 88 is positioned inside the sleeve 35 and the valve 83, and the second spring 88 is sleeved on the ejector rod 85; the top end of the second spring 88 presses against the stem 85, and the bottom end of the second spring 88 presses against the valve 83.

When the cam 4 rotates to drive the push rod 85 to drive the connecting rod 84 to move downwards, the push rod 85 presses the second spring 88 downwards, the second spring 88 presses the valve 83 downwards, and therefore the valve 83 is driven to move downwards to seal the annular communicating cavity 824; while the link 84 also compresses the first spring 87 downward;

when the cam 4 rotates towards the other direction, the top end of the push rod 85 moves upwards under the action of the first spring 87 and the second spring 88 and is pressed on the cam 4 all the time; meanwhile, during the upward movement of the rod 85, the actuating part 842 drives the valve 83 to move upward, thereby opening the annular communicating cavity 824.

Preferably, as shown in FIG. 1, the actuation assembly includes an arcuate actuation arm 91;

the housing is provided with an installation seat 15, and the arc-shaped actuation arm 91 is rotatably connected with the installation seat 15;

a tension spring 92 is arranged at the bottom of the arc-shaped actuating arm 91 between the actuating rod 71 and the mounting seat 15, and the bottom end of the tension spring 92 is fixedly connected with the shell;

the top end of the actuating rod 71 is fixedly connected with an actuating plate 712;

as shown in fig. 10, the end of the cam 4 facing the arc-shaped actuating arm 91 is provided with a pressing plate 41;

when the operating handle 5 rotates the cam 4 to the parking position from the driving position (i.e. when the operating handle 5 controls the top of the brake valve member to move downwards through the cam 5 to cut off the air path between the second air inlet 31 and the second air outlet 32), the pressing plate 41 can press one end of the arc-shaped actuating arm 91, so as to press the other end of the arc-shaped actuating arm 91 upwards to the bottom end of the actuating plate 712 to drive the actuating rod 71 to move upwards.

The utility model provides a hand brake valve that can automatic cutout air supply which the embodiment as follows:

when the operating handle 5 is in the driving position:

the actuating rod 71 moves downwards, and the first air inlet cavity 25 is communicated with the first air outlet cavity 24; the mandril 85 moves upwards, and the second air inlet cavity 33 is communicated with the second air outlet cavity 34;

when the automobile is in running, air enters from the air inlet 11 and sequentially passes through the first communicating channel 13, the first air inlet 21, the first air inlet cavity 25, the first air outlet cavity 24, the first air outlet 22, the second communicating channel 14, the second air inlet 31, the second air inlet cavity 33, the piston air inlet hole 823, the lower piston inner cavity 822, the annular communicating cavity 824, the second air outlet cavity 34 and the air outlet 12, the air outlet 12 is connected with the automobile brake air chamber spring cavity, the air enters the brake air chamber spring cavity through the air outlet 12, the parking spring is in a compressed state under the action of air pressure, the automobile is braked, and the automobile is in a running state.

When the bar handle 5 is in the parking position:

the actuating rod 71 moves upwards, the piston 711 seals the bottom port of the first air outlet cavity 24, and the air path between the first air inlet cavity 25 and the first air outlet cavity 24 is cut off; the mandril 85 moves downwards, the valve 83 seals the annular communicating cavity 824, and the air path between the second air inlet cavity 33 and the second air outlet cavity 34 is cut off; therefore, gas cannot enter the gas outlet 12 from the gas inlet 11, the gas cannot enter the spring cavity of the brake air chamber through the gas outlet, the parking spring is in a free stretching state, and parking braking of the vehicle is achieved.

When the control handle 5 moves from the driving position to the parking position:

the operating handle 5 drives the cam 4 to rotate, so that the ejector rod 85 moves downwards until the valve 83 seals the annular communicating cavity 824; meanwhile, in the process of rotating the cam 4, the pressure plate 41 on the cam 4 presses against one end of the arc-shaped actuation arm 91, so that the other end of the arc-shaped actuation arm 91 is lifted upwards, and in the process of lifting the other end of the arc-shaped actuation arm 91, the actuation plate 712 is driven to move upwards, so that the actuation rod 71 is lifted upwards until the piston 711 seals the bottom port of the first air outlet cavity 24; therefore, the arrangement of the actuating assembly in the application can ensure that the air path between the first air inlet cavity 25 and the first air outlet cavity 24 can be cut off while the air path between the second air inlet cavity 33 and the second air outlet cavity 34 is cut off through linkage control; at this time, even if the operating handle 5 is in the "false locking" state and automatically rebounds to the driving position, and the arc-shaped actuating arm 91 loses the acting force of the pressing plate 41 and returns, the actuating rod 71 always moves upwards under the action of the return spring 74, so that the piston 711 blocks the bottom port of the first air outlet cavity 24; namely: even if the operating handle 5 is in a false locking state and can automatically rebound to a state that the second air inlet cavity 33 and the second air outlet cavity 34 are communicated, the piston 711 on the actuating rod 71 can also keep a state that an air path between the first air inlet cavity 25 and the first air outlet cavity 24 is cut off, so that an air source passage of the valve cavity 3 is cut off, the stability of a parking function is ensured, and the occurrence of a vehicle slipping accident is avoided.

When the control handle 5 moves from the parking position to the driving position:

the operating handle 5 drives the cam 4 to rotate, so that the mandril 85 moves upwards until the valve 83 opens the annular communicating cavity 824; meanwhile, in the process of rotating the cam 4, the arc-shaped actuating arm 91 loses the acting force of the pressing plate 41 and is reset under the action of the tension spring 92;

then, the actuating rod 71 is pressed down by hand, so that the piston 711 opens the bottom port of the first air outlet cavity 24, and the first air inlet cavity 25 is communicated with the first air outlet cavity 24; then, the gas enters from the gas inlet 11, sequentially enters the first gas inlet cavity 25 and the first gas outlet cavity 24 through the first communication channel 13 and the first gas inlet 21, the first gas inlet cavity 25 and the first gas outlet cavity 24 are always communicated under the action of the gas, and the actuation rod 71 is kept in a downward pressing state.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.

Claims

1. A hand brake valve capable of automatically cutting off an air source is characterized by comprising a shell, wherein the bottom of the shell is provided with an air inlet and an air outlet;

the shell is provided with a stop valve cavity and a valve cavity;

2. The hand brake valve capable of automatically shutting off an air supply according to claim 1, wherein a first communicating passage communicating the air inlet port and the first air inlet port and a second communicating passage communicating the first air outlet port and the second air inlet port are provided in the housing.

3. The hand brake valve capable of automatically cutting off the air supply according to claim 2, wherein the valve cavity of the stop valve comprises a sliding cavity, a first air outlet cavity and a first air inlet cavity which are coaxially arranged and have diameters which are sequentially increased from top to bottom;

4. The manual brake valve capable of automatically cutting off the air supply as claimed in claim 3, wherein the inner side walls of the top end and the bottom end of the sliding cavity are embedded with sliding cavity sealing rings;

5. A hand brake valve capable of automatically cutting off air supply according to claim 3, wherein a buffer spring is arranged in the first air outlet chamber, and the buffer spring is sleeved on the actuating rod.

6. The hand brake valve capable of automatically cutting off the air supply according to claim 5, wherein the valve cavity comprises a second air inlet cavity provided with a second air inlet, and a second air outlet cavity provided with a second air outlet;

7. The hand brake valve capable of automatically cutting off the air supply according to claim 6, wherein the upper outer side wall of the upper piston is in sealing fit with the inner wall of the second air inlet cavity through a first upper piston sealing ring, and the lower inner side wall of the upper piston is in sealing fit with the outer wall of the valve through a second upper piston sealing ring;

8. The manual brake valve capable of automatically cutting off the air supply according to claim 6, wherein a plurality of piston air inlet holes for communicating the inner cavity of the lower piston with the second air inlet cavity are formed on the outer side wall of the lower part of the lower piston;

9. The hand brake valve capable of automatically shutting off an air supply as claimed in claim 8, wherein said tightening assembly comprises a first spring, a second spring;

10. A hand brake valve capable of automatically shutting off an air supply as defined in claim 9 wherein said actuator assembly includes an arcuate actuator arm;

the top end of the actuating rod is fixedly connected with an actuating plate;

when the operating handle drives the cam to rotate to the parking position from the driving position, the pressure plate can press one end of the arc-shaped actuating arm, so that the other end of the arc-shaped actuating arm is pressed upwards to the bottom end of the actuating plate to urge the actuating rod to move upwards.