CN111806412A - Trailer air pressure braking system and parking braking method thereof - Google Patents

Trailer air pressure braking system and parking braking method thereof Download PDF

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Publication number
CN111806412A
CN111806412A CN201910293308.2A CN201910293308A CN111806412A CN 111806412 A CN111806412 A CN 111806412A CN 201910293308 A CN201910293308 A CN 201910293308A CN 111806412 A CN111806412 A CN 111806412A
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CN
China
Prior art keywords
air
trailer
valve
communicated
brake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910293308.2A
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Chinese (zh)
Inventor
谢涛
缪菊平
曲学春
程志兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Heavy Duty Automobile Co Ltd
Original Assignee
Shaanxi Heavy Duty Automobile Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shaanxi Heavy Duty Automobile Co Ltd filed Critical Shaanxi Heavy Duty Automobile Co Ltd
Priority to CN201910293308.2A priority Critical patent/CN111806412A/en
Publication of CN111806412A publication Critical patent/CN111806412A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T15/00Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02Application and release valves
    • B60T15/18Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
    • B60T15/181Trailer control valves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T15/00Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02Application and release valves
    • B60T15/18Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
    • B60T15/182Trailer brake valves

Abstract

The invention provides a trailer pneumatic braking system and a parking braking method thereof. The double-circuit service braking system adopts three-pipeline gas circuit joints (red, yellow and white trailer handles), and ensures that the normal work of one circuit is not influenced when the other circuit fails under the simultaneous action of the four-circuit protection valve and the emergency relay valve of the trailer. The parking brake loop enables the trailer and a brake air chamber spring cavity of the tractor to realize synchronous action and realizes the in-situ spring parking after the trailer is disconnected. The tractor can be matched with a tractor with a trailer gas circuit joint of three pipelines (red, yellow and white handles) and can be matched with a tractor with a trailer gas circuit joint of two pipelines (red and yellow handles), and the tractor has good adaptability.

Description

Trailer air pressure braking system and parking braking method thereof
Technical Field
The invention relates to the technical field of vehicle braking, in particular to a trailer air pressure braking system and a parking braking method thereof.
Background
The existing military trailers and the brake chambers of the tractor are inconsistent in action, the air brake connectors of military off-road vehicles, the tractor and the full trailer of each series are double pipelines (red and yellow connectors are used for shaking hands), the service brake signal air and the parking brake signal air enter the trailer through the air circuit connector (yellow connector) of the trailer, so that the trailer cannot identify and distinguish the two signal air, and the corresponding brake chambers of the trailer can only generate air pressure brake of a diaphragm cavity. When a tractor is parked (a hand brake is pulled up), a brake chamber of the tractor generates spring parking, a brake chamber of a full trailer generates diaphragm air pressure parking, a diaphragm cavity of the air chamber of the trailer is parked at long-term air pressure after the trailer is disconnected, high air pressure exists in an air pipeline of the trailer at long term, air leakage of the air pipeline is easily caused, the parking braking force of the trailer disappears, and a slope slips.
In view of the above-mentioned drawbacks, the inventors of the present invention have finally obtained the present invention through a long period of research and practice.
Disclosure of Invention
In order to solve the technical defects, the invention provides a trailer air pressure braking system and a parking braking method thereof, and the trailer air pressure braking system can realize free switching connection between tractors with air path joints of three pipelines (red, yellow and white holding hands) and two pipelines (red and yellow holding hands).
The technical scheme adopted by the invention is as follows:
the trailer air-pressure braking system comprises a first trailer air path joint, a second trailer air path joint, a four-circuit protection valve, a trailer emergency relay valve, a first traveling relay valve, a second traveling relay valve, a first air bottle and a second air bottle;
the air inlet end of the air passage joint of the second trailer is used for being communicated with a compressed air interface of a tractor, the air outlet end of the air passage joint of the second trailer is communicated with an air inlet of a four-circuit protection valve, the air inlet ends of the first air cylinder and the second air cylinder are respectively connected with a first circuit interface and a second circuit interface of the four-circuit protection valve, the air outlet ends of the first air cylinder and the second air cylinder are respectively communicated with the air inlets of a first traveling relay valve and a second traveling relay valve, and the air outlets of the first traveling relay valve and the second traveling relay valve are respectively communicated with a front axle brake air chamber membrane cavity and a rear axle brake air chamber membrane cavity;
the air inlet end of the air passage joint of the first trailer is used for communicating a driving brake signal air from a tractor, the air outlet end of the air passage joint of the first trailer is communicated with a control port (No. 4 port) of the emergency relay valve of the trailer, two air outlets (No. 2 ports) of the signal air of the emergency relay valve of the trailer are respectively communicated with control ports of the first driving relay valve and a second driving relay valve, an air inlet (No. 1 port) of the emergency relay valve of the trailer is communicated with an air passage joint of the second trailer, and an air outlet (No. 1-2 port) of the emergency relay valve of the trailer is communicated with a first air bottle.
Furthermore, a first manual switch valve is connected between an air outlet (No. 1-2 port) of the trailer emergency relay valve and the first air bottle.
Furthermore, the trailer air pressure brake system also comprises a third trailer air path joint, a third air bottle, a parking relay valve and a quick release valve;
the air inlet end of the air path joint of the third trailer is used for communicating a hand braking signal air from a tractor, the air outlet end of the air path joint of the third trailer divides the hand braking signal air into two paths, the first path is communicated with the air inlet of the quick release valve, the second path is communicated with the control port of the parking relay valve, the air outlet of the parking relay valve is communicated with the air inlet of the quick release valve, and the air outlet of the quick release valve is communicated with the spring cavity of the brake air chamber;
and the air inlet end of the third air bottle is connected to a third loop interface of the four-loop protection valve, and the first air outlet end of the third air bottle is communicated with an air inlet of the parking relay valve.
Further, a second air outlet end of the third air bottle is communicated with an air inlet of the quick release valve through a second manual switch valve.
Furthermore, a first two-way check valve is arranged between the second manual switch valve and the air inlet of the quick release valve, one air inlet of the first two-way check valve is communicated with the air outlet end of the second manual switch valve, the other air inlet of the first two-way check valve is communicated with the air outlet end of the third trailer air passage joint and the air outlet of the parking relay valve, and the air outlet of the first two-way check valve is communicated with the air inlet of the quick release valve.
Furthermore, an air outlet end of the air passage joint of the third trailer divides the hand braking signal air into two paths through a flow dividing valve, the first path is communicated with an air inlet end of a second two-way check valve, the other air inlet end of the second two-way check valve is communicated with an air outlet of the parking relay valve, and an air outlet end of the second two-way check valve is communicated with an air inlet of the first two-way check valve.
In another aspect of the present invention, there is provided a parking brake method:
when the three pipelines are in a working state, namely three trailer gas path joints are simultaneously connected with a tractor, a first manual switch valve is kept normally open, a second manual switch valve is kept normally closed, when the tractor releases parking (namely releases a manual brake), a hand brake signal gas entering the third trailer gas path joint is divided into two parts, and one part enters a brake air chamber spring cavity through a first two-way one-way valve; the other path of signal air is connected to a control port of the parking relay valve, so that compressed air of a third air bottle enters a spring cavity of the air chamber through the parking relay valve, and under the combined action of the compressed air and the signal air of the hand brake, the energy storage spring is pressed back by air pressure, and the parking brake is released; when the tractor parks and brakes (pulls up the hand brake), the air path joint of the third trailer cuts off air, compressed air in the air chamber spring cavity is instantly discharged into the atmosphere through the quick release valve, and the trailer parks in place by the spring thrust.
Further, when double-circuit operating condition, first and second trailer gas circuit connects the tractor promptly, and third trailer gas circuit connects and does not connect, keeps first manual switch valve to open normally, and the manual switch valve of second opens normally, and the pneumatic pressure that comes from the third gas cylinder gets into air chamber spring chamber and relieves the parking. When the tractor is disconnected from the trailer, the emergency relay valve of the trailer automatically generates diaphragm brake to park the trailer in place.
Compared with the prior art, the invention has the beneficial effects that:
the trailer air pressure braking system and the parking braking method thereof provided by the invention can realize free switching connection between tractors with air circuit joints of three pipelines (red, yellow and white grips) and double pipelines (red and yellow grips). The double-loop service braking system ensures that the normal work of another loop is not influenced when one loop fails under the simultaneous action of the four-loop protection valve and the emergency relay valve of the trailer. The parking brake loop enables the trailer and a brake air chamber spring cavity of the tractor to realize synchronous action and realizes the in-situ spring parking after the trailer is disconnected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a trailer pneumatic brake system of the present invention.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 is a schematic view of a trailer pneumatic brake system of the present invention, as shown in fig. 1, the trailer pneumatic brake system comprises a first trailer gas circuit connector 1, a second trailer gas circuit connector 2, a four-circuit protection valve 4, a trailer emergency relay valve 5, a first traveling relay valve 11, a second traveling relay valve 15, a first gas cylinder 7 and a second gas cylinder 8; the air inlet end of the second trailer air passage joint 2 is used for being communicated with a compressed air interface of a tractor, the air outlet end of the second trailer air passage joint is communicated with an air inlet of a four-loop protection valve 4, the air inlet ends of a first air bottle 7 and a second air bottle 8 are respectively connected with a first loop interface and a second loop interface of the four-loop protection valve 4, the air outlet ends of the first air bottle and the second air bottle are respectively communicated with air inlets (No. 1 ports) of a first traveling relay valve 11 and a second traveling relay valve 15, and the air outlets (No. 2 ports) of the first traveling relay valve 11 and the second traveling relay valve 15 are respectively communicated with a front axle brake air chamber diaphragm cavity and a rear axle brake air chamber diaphragm cavity; the air inlet end of the air passage joint 1 of the first trailer is used for communicating the driving brake signal air from the tractor, the air outlet end of the air passage joint is communicated with the control port (port No. 4) of the emergency relay valve 5 of the trailer, two signal air outlets (ports No. 2) of the emergency relay valve of the trailer are respectively communicated with the control ports (ports No. 4) of the first driving relay valve 11 and the second driving relay valve 15, the air inlet (port No. 1) of the emergency relay valve of the trailer is communicated with the air passage joint of the second trailer, and the air outlet (port No. 1-2) of the emergency relay valve of the trailer is communicated with the first air bottle.
It should be noted that when the tractor treads on the foot brake pedal, the compressed air from the tractor enters the four-circuit protection valve 4 through the second trailer air circuit connector 2 (red connector), and is divided into two independent circuits which enter the two corresponding air cylinders 7 and 8 to supply air to the front axle brake circuit and the rear axle brake circuit. The brake signal air from the tractor enters a control port (port 4) of the trailer emergency relay valve 5 through a first trailer air path connector 1 (yellow connector), a valve core is opened, two signal air outlets (port 2) of the trailer emergency relay valve 5 output brake signal air to enter control ports (port 4) of two brake relay valves 11 and 15 to open the valve core, compressed air from a first air bottle 7 and a second air bottle 8 is received by air inlets (port 1) of the two brake relay valves 11 and 15, after the valve core is opened, the air outlets (port 2) and the air inlets (port 1) of the two brake relay valves 11 and 15 are communicated, and the compressed air enters front and rear axle brake air chamber diaphragm cavities to generate brake force. When the tractor loosens the foot brake pedal, the air path joint 1 (yellow joint) of the first trailer is cut off, the valve core is closed, and then the air outlets (No. 2) of two signal air outlets of the trailer emergency relay valve 5 are cut off, so that the air outlets (No. 4) of the two travelling relay valves 11 and 15 are cut off, the valve core is closed, the air outlets (No. 2) of the two travelling relay valves 11 and 15 stop supplying air to the diaphragm cavities of the front and rear axle brake air chambers, the air in the diaphragm cavities respectively returns to the two travelling relay valves 11 and 15, and is exhausted to the atmosphere through the air outlets (No. 3) of the two travelling relay valves 11 and 15, so that the braking force disappears. The front axle service braking loop and the rear axle service braking loop are under the simultaneous action of the four-loop protection valve 4 and the trailer emergency relay valve 5, so that the normal work of another loop is not influenced when one loop fails.
In one embodiment, a first manual switch valve 6 is connected between an air outlet (No. 1-2 port) of the trailer emergency relay valve 5 and a first air bottle 7 and is kept in a normally open state at ordinary times; if the automobile is parked for a long time, the first manual switch valve 6 is manually closed, high-pressure air in a service brake loop pipeline is discharged, and the pipeline is prevented from being damaged.
In a more preferred embodiment, the trailer pneumatic brake system further comprises a third trailer air passage connector 3 (white connector), a third air cylinder 9, a parking relay valve 14 and a quick release valve 13; the air inlet end of the third trailer air path joint 3 (white joint) is used for communicating a hand braking signal gas from a tractor, the air outlet end of the third trailer air path joint divides the hand braking signal gas into two paths, the first path is communicated with the air inlet of the quick release valve 13, the second path is communicated with the control port (No. 4 port) of the parking relay valve 14, the air outlet of the parking relay valve 14 is communicated with the air inlet of the quick release valve 13, and the air outlet of the quick release valve 13 is communicated with the spring cavity of the brake air chamber; the air inlet end of the third air bottle 9 is connected to the third loop interface of the four-loop protection valve 4, and the first air outlet end of the third air bottle is communicated with the air inlet of the parking relay valve 14. And the second air outlet end of the third air bottle 9 is communicated with the air inlet of the quick release valve 13 through a second manual switch valve 10.
In a more specific embodiment, a first two-way check valve 12 is arranged between the second manual switch valve 10 and the air inlet of the quick release valve 13, one air inlet of the first two-way check valve 12 is communicated with the air outlet end of the second manual switch valve 10, the other air inlet thereof is communicated with the air outlet end of the third trailer air passage connector 3 and the air outlet (port No. 2) of the parking relay valve 14, and the air outlet thereof is communicated with the air inlet of the quick release valve 13. The air outlet end of the third trailer air passage joint 3 divides the hand braking signal air into two paths through a flow dividing valve 16, the first path is communicated with an air inlet end of a second double-way check valve 17, the other air inlet end of the second double-way check valve 17 is communicated with an air outlet (No. 2 port) of the parking relay valve 14, and the air outlet end of the second double-way check valve 17 is communicated with an air inlet of the first double-way check valve 12.
It should be noted that when the three pipelines are in a working state, namely three trailer gas circuit joints 1, 2 and 3 (red, yellow and white) are simultaneously connected with a tractor, the first manual switch valve 6 is kept normally open, the second manual switch valve 10 is kept normally closed, when the tractor relieves the parking (namely, the manual brake is released), the hand brake signal gas entering the third trailer gas circuit joint 3 (white) is divided into two parts by the diverter valve 16, one part enters the quick release valve 13 through the second two-way check valve 17 and the first two-way check valve 12 and then enters the spring cavity of the brake air chamber, and the energy storage spring is pressed back by the gas pressure, so that the parking brake is relieved; considering that the air quantity of a part of tractor parking air cylinders is possibly insufficient to instantly release the parking brakes of the tractor and the trailer simultaneously, the other path of signal air is connected into a control port (port No. 4) of the parking relay valve 14, a valve core of the parking relay valve 14 is opened, compressed air of a third air cylinder 9 enters a second two-way check valve 17 through the parking relay valve 14, enters a quick release valve 13 through a first two-way check valve 12 and then enters a spring cavity of a brake air chamber, and then the parking brakes are released; when the tractor parks and brakes (pulls up the hand brake), the air path connector 3 (white) of the third trailer cuts off air, compressed air in the air chamber spring cavity is instantly discharged into the atmosphere through the quick release valve 13, and the trailer parks in place by the spring thrust. If the parking is required for a long time, the manual switch valve 6 is manually closed. In addition, after the trailer is disconnected, when the trailer is required to be moved by external force, the second manual switch valve 10 can be opened, residual compressed air in the third air bottle 9 enters the quick release valve 13 through the first two-way one-way valve 12 and then enters the spring cavity of the brake air chamber, and the spring parking is released.
When tractor trailer gas circuit connects when the double circuit, then full trailer also switches into double circuit operating condition, first and second trailer gas circuit connects 1 promptly, 2 (red, yellow) connect the tractor, third trailer gas circuit connects 3 (white joint) and disconnects, keep first manual switch valve 6 to normally open, manual switch valve 10 of second normally open, the high-pressure gas that comes from third gas cylinder 9 passes through second manual switch valve 10, first pair gets into air chamber spring chamber with quick release valve 13 and releases the parking. After the tractor is disconnected from the trailer, the trailer emergency relay valve 5 automatically generates diaphragm braking to park the trailer in place. If the trailer is required to move by external force, the second manual switch valve 10 can be opened, and residual compressed air in the third air bottle 9 enters the quick release valve 13 through the first two-way one-way valve 12 and then enters the spring cavity of the brake air chamber, so that the spring parking is released. The trailer can be moved by pushing the black button of the trailer emergency relay valve 5 upward. And when the vehicle is parked for a long time, the manual switch valve 6 and the second manual switch valve 10 are manually closed, and the compressed air in the spring cavity of the air chamber is exhausted, so that the spring parking is generated.
The trailer air pressure brake system adopts three-pipeline air path joints (red, yellow and white trailer handles), a double-loop service brake loop and a parking brake loop. The tractor can be matched with a tractor with a trailer gas circuit joint of three pipelines (red, yellow and white handles) and can be matched with a tractor with a trailer gas circuit joint of two pipelines (red and yellow handles), and the tractor has good adaptability. The parking brake loop enables the trailer and a brake air chamber spring cavity of the tractor to realize synchronous action and realizes the in-situ spring parking after the trailer is disconnected. The double-loop service braking system ensures that the normal work of another loop is not influenced when one loop fails under the simultaneous action of the four-loop protection valve and the emergency relay valve of the trailer.
The foregoing is merely a preferred embodiment of this invention, which is intended to be illustrative, and not limiting. The structure, the connection mode and the like of all the components in the invention can be changed, and the equivalent transformation and the improvement on the basis of the technical scheme of the invention are not excluded from the protection scope of the invention.

Claims (8)

1. A trailer pneumatic brake system comprising: first trailer gas circuit connects, second trailer gas circuit connects, its characterized in that still includes: the four-circuit protection valve, the trailer emergency relay valve, the first traveling relay valve, the second traveling relay valve, the first gas cylinder and the second gas cylinder;
the air inlet end of the air passage joint of the second trailer is used for being communicated with a compressed air interface of a tractor, the air outlet end of the air passage joint of the second trailer is communicated with an air inlet of a four-circuit protection valve, the air inlet ends of the first air cylinder and the second air cylinder are respectively connected with a first circuit interface and a second circuit interface of the four-circuit protection valve, the air outlet ends of the first air cylinder and the second air cylinder are respectively communicated with the air inlets of a first traveling relay valve and a second traveling relay valve, and the air outlets of the first traveling relay valve and the second traveling relay valve are respectively communicated with a front axle brake air chamber membrane cavity and a rear axle brake air chamber membrane cavity;
the air inlet end of the air passage joint of the first trailer is used for communicating a driving brake signal air from a tractor, the air outlet end of the air passage joint of the first trailer is communicated with a control port (No. 4 port) of the emergency relay valve of the trailer, two air outlets (No. 2 ports) of the signal air of the emergency relay valve of the trailer are respectively communicated with control ports of the first driving relay valve and a second driving relay valve, an air inlet (No. 1 port) of the emergency relay valve of the trailer is communicated with an air passage joint of the second trailer, and an air outlet (No. 1-2 port) of the emergency relay valve of the trailer is communicated with a first air bottle.
2. A trailer air brake system as claimed in claim 1 wherein a first manually operable on/off valve is connected between the outlet port (port No. 1-2) of the trailer emergency relay valve and the first air cylinder.
3. A trailer air brake system as claimed in claim 1 or 2 further comprising a third trailer air circuit connection, a third air cylinder, a park relay valve and a quick release valve;
the air inlet end of the air path joint of the third trailer is used for communicating a hand braking signal air from a tractor, the air outlet end of the air path joint of the third trailer divides the hand braking signal air into two paths, the first path is communicated with the air inlet of the quick release valve, the second path is communicated with the control port of the parking relay valve, the air outlet of the parking relay valve is communicated with the air inlet of the quick release valve, and the air outlet of the quick release valve is communicated with the spring cavity of the brake air chamber;
and the air inlet end of the third air bottle is connected to a third loop interface of the four-loop protection valve, and the first air outlet end of the third air bottle is communicated with an air inlet of the parking relay valve.
4. A trailer pneumatic brake system as claimed in claim 3, wherein the second outlet port of the third gas cylinder communicates with the inlet port of the quick release valve via a second manual switch valve.
5. The pneumatic brake system for trailers as recited in claim 4, wherein a first two-way check valve is arranged between the second manual switch valve and the air inlet of the quick release valve, one air inlet of the first two-way check valve is communicated with the air outlet end of the second manual switch valve, the other air inlet of the first two-way check valve is communicated with the air outlet end of the third trailer air passage joint and the air outlet of the parking relay valve, and the air outlet of the first two-way check valve is communicated with the air inlet of the quick release valve.
6. The pneumatic brake system as recited in claim 5, wherein the outlet port of the third trailer pneumatic connection splits the hand brake signal air into two paths through a splitter valve, the first path communicating with an inlet port of a second two-way check valve, the other inlet port of the second two-way check valve communicating with the outlet port of the parking relay valve, the outlet port of the second two-way check valve communicating with the inlet port of the first two-way check valve.
7. A parking brake method for use with the trailer pneumatic brake system of claim 6,
when the three pipelines are in a working state, namely three trailer gas path joints are simultaneously connected with a tractor, a first manual switch valve is kept normally open, a second manual switch valve is kept normally closed, when the tractor releases parking (namely releases a manual brake), a hand brake signal gas entering the third trailer gas path joint is divided into two parts, and one part enters a brake air chamber spring cavity through a first two-way one-way valve; the other path of signal air is connected to a control port of the parking relay valve, so that compressed air of a third air bottle enters a spring cavity of the air chamber through the parking relay valve, and under the combined action of the compressed air and the signal air of the hand brake, the energy storage spring is pressed back by air pressure, and the parking brake is released; when the tractor parks and brakes (pulls up the hand brake), the air path joint of the third trailer cuts off air, compressed air in the air chamber spring cavity is instantly discharged into the atmosphere through the quick release valve, and the trailer parks in place by the spring thrust.
8. A parking brake method according to claim 7,
when the double-pipeline operating condition, first and second trailer gas circuit connects the tractor promptly, and third trailer gas circuit connects and does not connect, keeps first manual switch valve to open normally, and the manual switch valve of second is open normally, and the atmospheric pressure that comes from the third gas cylinder gets into air chamber spring chamber and removes the parking. When the tractor is disconnected from the trailer, the emergency relay valve of the trailer automatically generates diaphragm brake to park the trailer in place.
CN201910293308.2A 2019-04-12 2019-04-12 Trailer air pressure braking system and parking braking method thereof Pending CN111806412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910293308.2A CN111806412A (en) 2019-04-12 2019-04-12 Trailer air pressure braking system and parking braking method thereof

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Application Number Priority Date Filing Date Title
CN201910293308.2A CN111806412A (en) 2019-04-12 2019-04-12 Trailer air pressure braking system and parking braking method thereof

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112248990A (en) * 2020-12-24 2021-01-22 天津所托瑞安汽车科技有限公司 Pneumatic parking system and parking control method thereof
CN113119933A (en) * 2021-04-06 2021-07-16 广州瑞立科密汽车电子股份有限公司 Trailer line control unit and brake system
CN113291274A (en) * 2021-06-30 2021-08-24 三一汽车起重机械有限公司 Vehicle brake system and work vehicle
CN113479175A (en) * 2021-08-23 2021-10-08 广州朗晴电动车有限公司 But braking system device of self-propelled fire control trailer
CN112660084B (en) * 2021-01-25 2022-03-18 郑州宇通重工有限公司 Traction rod trailer braking system and traction rod trailer

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CN205836799U (en) * 2016-07-29 2016-12-28 东风商用车有限公司 A kind of emergency brake device
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GB1393776A (en) * 1971-08-05 1975-05-14 Wabco Westinghouse Gmbh Multi-circuit brake system for a vehicle trailer
DE102008009043B3 (en) * 2008-02-14 2009-05-14 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Electronically controlled braking system with redundant control of the brake actuators
CN104709261A (en) * 2014-05-29 2015-06-17 湖北三江航天万山特种车辆有限公司 Full-trailer braking system and braking method thereof
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CN205836799U (en) * 2016-07-29 2016-12-28 东风商用车有限公司 A kind of emergency brake device

Cited By (7)

* Cited by examiner, † Cited by third party
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CN112248990A (en) * 2020-12-24 2021-01-22 天津所托瑞安汽车科技有限公司 Pneumatic parking system and parking control method thereof
CN112248990B (en) * 2020-12-24 2021-03-26 天津所托瑞安汽车科技有限公司 Pneumatic parking system and parking control method thereof
CN112660084B (en) * 2021-01-25 2022-03-18 郑州宇通重工有限公司 Traction rod trailer braking system and traction rod trailer
CN113119933A (en) * 2021-04-06 2021-07-16 广州瑞立科密汽车电子股份有限公司 Trailer line control unit and brake system
CN113291274A (en) * 2021-06-30 2021-08-24 三一汽车起重机械有限公司 Vehicle brake system and work vehicle
CN113291274B (en) * 2021-06-30 2022-03-01 三一汽车起重机械有限公司 Vehicle brake system and work vehicle
CN113479175A (en) * 2021-08-23 2021-10-08 广州朗晴电动车有限公司 But braking system device of self-propelled fire control trailer

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