CN2127692Y

CN2127692Y - Brake valve for lorry trailers

Info

Publication number: CN2127692Y
Application number: CN 92226744
Authority: CN
Inventors: 张军
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-04
Filing date: 1992-07-04
Publication date: 1993-03-03
Anticipated expiration: 2002-07-04

Abstract

The utility model relates to a brake valve for lorry trailers, which is composed of an inflation component and a control component. The inflation component is composed of an upper housing which is provided with an inlet interface and an inflation interference, an inflation valve which is arranged on the inflation interface of the upper housing, an inflation spring and a top cover; the control component is composed of an intermediate housing which is provided with a control interface, a control piston which is arranged in the lower cavity of the intermediate housing and provided with an exhaust core pipe which extends outside the middle clapboard of the control piston, a lower housing which is arranged below the intermediate housing, an adjusting screw which screws into the lower end of the lower housing, a lock nut, a spring seat and a control spring. The utility model is sensitive in response and makes a trailer and a main vehicle brake and abate simultaneously, and the utility model has the advantages of simple structure, easy fabrication and low cost.

Description

Brake valve for lorry trailers

The utility model relates to the trailer braking valve in a kind of brake system of truck.

Trailer braking valve in the brake system of truck of band trailer, the two diaphragm type trailer braking valves of the series connection that China's First Automotive Works is as shown in Figure 1 produced, it is by having the intake interface c that links to each other by the wet air tank of pipeline and main car and passing through separating switch, connector, trailer distribution valve is to the upper shell 3 of the gas filed inflation interface of trailer air tank D, be contained on the upper shell and press to the pneumatic element and the middle shell 10 that has the control interface F that links to each other with main car brake activation valve that the charge valve 2 of inflation valve port E constitutes by valve spring 1, be contained in the middle shell inner chamber and enter the core pipe 4 of upper shell inner chamber, be equipped with respectively on the core pipe, following

diaphragm

11 and 12, the lower end that is contained in the lower house 9 below the middle shell has one by trimming screw 5, jam nut 6, spring perch 7 act on down the function unit that the balance spring 8 of diaphragm bottom constituted and form.The two diaphragm type trailer braking valves of this series connection are because spring 8 is subjected to the counteraction of upper and lower diaphragm and valve spring, and its rigidity is very big.When depressing brake pedal, the driver carries out a glancing impact, the air pressure that enters the B chamber is smaller, the antagonistic force that can not overcome spring 8 moves down core pipe 4, core pipe upper end can not break away from the lower surface of inflating valve port, pressurized air between A chamber and the trailer distribution valve can not be discharged, trailer distribution valve is inoperative, and the pressurized air in the trailer air tank enters the trailer braking protection valve chamber with regard to the impassabitity trailer distribution valve and carries out a braking, and therefore trailer takes place collides main car phenomenon; When carrying out emergency braking, because the rigidity of spring 8 is big, make trailer braking valve slow in reacting again, cause the trailer main car brake phenomenon that lags behind, also make trailer collide main car.In addition, this trailer braking valve adjustment is got up also inconvenient; If the elastic force of spring 8 is turned down, then to inflate with regard to the out of reach authorized pressure to the trailer air tank, upper diaphragm makes the core pipe move down under the inflation pressure effect, even the disengaging charge valve causes exhaust and makes the trailer automatic brake; If the elastic force of spring 8 is transferred big, cause not braking.And during emergency braking, the trailer main car braking that lags behind again causes trailer to collide main car phenomenon.

The purpose of this utility model is to overcome the deficiency of above-mentioned technology and a kind of autotruck trailer braking valve is provided, and makes its train braking sensitivity, and is simple in structure.

The utility model autotruck trailer braking valve is made up of pneumatic element and function unit, be characterized in: pneumatic element is by the upper shell that has with wet air tank intake interface that links to each other and the inflation interface that links to each other with the trailer air tank of main car, be contained in the charge valve on the upper shell inflation valve port, the top cover that acts on the air spring on the charge valve and be pressed in the air spring upper end constitutes; Function unit is the middle shell that links to each other by with upper shell, the control interface that is communicated with the upper shell cavity of resorption and links to each other with main car brake activation valve by pipeline, be contained in the control plunger that the Shen goes out the exhaust core pipe of its intermediate hsg that has of middle shell cavity of resorption, be contained in the lower house of the band Air Filter of middle shell lower end, screw in the trimming screw of lower house lower end, screw in the jam nut of trimming screw, and the spring perch that joins of trimming screw and act on spring perch and control plunger between controlling spring constitute.

Description of drawings is as follows:

The liberation 141 type autotruck trailer braking valve structural representations that Fig. 1 produces for China's First Automotive Works;

Fig. 2 is the structural representation of the utility model autotruck trailer braking valve.

Now the utility model is described in further detail in conjunction with the embodiments:

Among Fig. 21 is trimming screw, and 2 is jam nut, 3 lower houses for the band Air Filter, 4 is spring perch, and 5 is controlling spring, and 6 is middle shell, lower house joins by screw and middle shell, 8 control plungers for the band exhaust core pipe, and 13 is upper shell, 11 is charge valve, 12 is air spring, and 16 is upper shell, and upper shell and middle shell also join with screw, 7,9,10,14 is seal ring, and 15 is intermediate hsg.

The autotruck of the utility model band trailer is when normal operation, control plunger 8 under the effect of controlling spring 5 to top offset, make the exhaust core pipe of control plunger upper end contact and push away charge valve and leave the inflation valve port with charge valve 11 lower surfaces, pressurized air by the wet air tank of main car is passed through intake interface 18, the inflation valve port is inflated interface 19 through separating switch, connector, separating switch on the trailer, trailer distribution valve enter the trailer air tank; When the driver exercises a glancing impact, come the pressurized air of autonomous car brake activation valve to move down by control interface control of access piston upper end and control plunger, exhaust core pipe on control plunger and then moves down, charge valve 11 is closed the charge valve mouth under the effect of air spring 12, the exhaust core pipe disengaging contacts with charge valve, and a part of pressurized air between trailer distribution valve and the A chamber is by the Air Filter exhaust to atmosphere of exhaust core pipe through the lower house lower end.The air pressure of this section pipeline impels the trailer distribution valve action and makes the pressurized air of trailer air tank make trailer carry out braking through the brake repair room that trailer distribution valve enters the trailer front and back wheel once descending.The size of trailer point braking force depends on that the driver depresses the position of brake pedal.When the driver carries out emergency braking, the gaseous tension of control of access piston upper end reaches maxim, make control plunger move on to lower dead point rapidly, exhaust core pipe leaves the distance maximum of charge valve, the A chamber is maximum to the amount of the pressurized air exhaust to atmosphere between the trailer distribution valve, trailer distribution valve is connected the opening maximum of trailer braking protection valve chamber, and the pressure that therefore charges into the trailer braking protection valve chamber is also maximum, and the braking force of trailer is also maximum.When driver's loosen the brake, main car brake activation valve makes the pressurized air exhaust to atmosphere in the brake repair room of main car front and back, meanwhile the pressurized air of control plunger epicoele is also rapidly by moving on main car brake activation valve exhaust to atmosphere, the control plunger, exhaust core pipe with push away charge valve after charge valve contacts again away from the inflation valve port, the pressurized air of the wet air tank of main car is inflated to the trailer air tank by the inflation valve port again.Unclamp jam nut, can change the pressure of controlling spring, thereby change the size of trailer point braking force by the rotation trimming screw to control plunger.

The utility model compared with prior art has following advantage:

1, highly sensitive, the truck of the utility model band trailer is housed when driving, because its control spring only need overcome the resistance of air spring, therefore, rigidity is smaller. The driver puts when braking, as long as main car brake valve will make control piston move down to the air that control piston is filled with littler pressure, allows its exhaust core pipe exhaust, causes the trailer air tank to trailer braking protection valve chamber pressurising power air so that trailer and main car are braked simultaneously; When the driver is alleviated braking, main Car and trailer be brake off simultaneously almost also.

2, do not have trailer automatic brake phenomenon when driving, because controlling spring is bigger than air spring rigidity, when normally driving a vehicle, exhaust core pipe makes the inflation valve port all the time, is in to trailer air tank inflated condition, so autokinetic phenomenon voluntarily will not appear in trailer;

3, simple in structure, make easily: the utility model autotruck trailer braking valve replaces two exigent upper and lower diaphragms of manufacturing technology with a control plunger, therefore structure is greatly simplified, and not only manufacture easily, and cost also obviously reduces.

Claims

1, a kind of autotruck trailer braking valve is made up of pneumatic element and function unit, it is characterized in that:

(1) described pneumatic element is by the upper shell 13 that has with wet air tank intake interface 18 that links to each other and the inflation interface 17 that links to each other with the trailer air tank of main car, be contained in the charge valve 11 on the upper shell inflation valve port, act on the air spring 12 on the charge valve and the top cover 16 that is pressed in the air spring upper end and is fixed on the upper shell upper end constitutes;

(2) described function unit is by the middle shell 6 that links to each other with upper shell, the control interface 19 that is communicated with the middle shell cavity of resorption and links to each other with main car brake activation valve by pipeline, be contained in the control plunger 8 that the Shen goes out the exhaust core pipe of its intermediate hsg 15 that has of middle shell cavity of resorption, be contained in the lower house 3 of the band Air Filter below the middle shell, screw in the trimming screw 1 of lower house lower end, jam nut 2, spring perch 4 and act on spring perch and control plunger between controlling spring 5 constitute.