CN2516409Y - Emergency relay valve of double-pipeline trailer - Google Patents

Abstract

The utility model provides a dual pipeline trailer emergency relay valve, which comprises a shelf and an upper cover; the shell is provided with a piston which is connected with the shell, and an inlet valve and an emergency piston are arranged inside the shell; cavity H, F, A, B and C are formed in sequence, wherein the cavity H, F, A and B are communicated with a control tube, a brake chamber, an air supply pipe and an air cylinder correspondingly. The utility model is characterized in that: the inside diameter of the shell is decreased in ladder type; the diameter of the cavity H is larger than that of the cavity F; the piston adopts a ladder type and is formed into grade 2 seal with the shell through a sealing ring; a Y-shaped sealing ring is positioned at the top circle upper end of the emergency piston and is sealed with the shell; the emergency piston is provided with a protuberance and is formed into a convex opening with the upper face of the inlet valve. As the diameter of the cavity H is larger than that of the cavity F, so that the braking pressure of the trailer is higher than that of the tractor under the same pressure, thereby the shortcomings on long braking pipeline of trailer and the desynchrony of braking between the car and the trailer can be made up. The utility model has the advantages of simple and reasonable structure, easy manufacture, convenient installation and stable and reliable performance.

Description

Dual circuit trailer emergency relay valve

Technical field

The utility model provides a kind of dual circuit trailer emergency relay valve, belongs to the brake valve of car technical field.

Background technology

Along with auto-industry and expanding economy, trailer is also constantly transformed, lengthening, because trailer is far away apart from brake activation valve, its braking air-flow output pressure is identical, cause the brake of trailer to lag in automobile, trailer is also in walking after tending to occur braking automobile, the phenomenon of car to car impact, at above-mentioned phenomenon, our company has applied for utility model patent on November 28th, 2000: the dual circuit trailer braking valve, the patent No.: 00256834, its technology contents is: on the basis of original dual circuit trailer braking valve, fix a sleeve pipe at lower piston towards cavity e side, sleeve pipe and housing are tightly connected and form a new cavity f with lower piston through seal groove, establish a pore on the cavity f corresponding shell.This brake activation valve is by isolating a new cavity f in cavity e, make the diameter of cavity e less than cavity d, so just guaranteed at the pressure of same pressure lower chamber e big, output gas flow is big, remedied brake activation valve apart from trailer distance, automobile and trailer nonsynchronous defective of braking, stable and reliable for performance.But along with developing of automobile industry, add more than 20 meter of long vehicle vehicle commander even longer now, only depend on above-mentioned patent just can not remedy brake activation valve fully like this apart from trailer distance, automobile and trailer nonsynchronous defective of braking, and the dual circuit emergency relay valve of present automotive use, basically traction braking air pressure and trailer braking protection valve air pressure are 1: 1 relations, this braking ratio is adapted to the trailer braking protection valve pipeline less than 6 meters vehicle, is unappeasable far away for the brake request of extended type superimposed trailer.

Summary of the invention

The purpose of this utility model provides a kind ofly can overcome above-mentioned defective, guarantee automobile and the trailer synchronous dual circuit trailer emergency relay valve of braking.

Comprise housing and the loam cake that is positioned at the housing upper end, be provided with the piston and the inside that are tightly connected with it in the housing successively and be with air intake valve, the emergency piston of spring, and form cavity H successively, F, A, B, C, cavity H wherein, F, A, B correspondence and control tube, compressed air brake cylinder, air supply pipe, air receiver communicates, cavity B communicates with cavity C, be pressed with spring between emergency piston bottom and the housing, it is characterized in that: the internal diameter staged of housing reduces, the diameter of cavity H is greater than the diameter of cavity F, piston adopts step, its bottom is provided with the convex annular mouth mask on the exhausr port of air intake valve, and through seal ring and 2 grades of sealings of housing formation, the upper end cylindrical of emergency piston is set with y-shaped ring and housing seal, and the upper surface that emergency piston is provided with projection and air intake valve constitutes tang.

Its principle of work is: 1, carry out low pressure insurance braking, when the air pressure of air supply pipe enters cavity A, air pressure makes the lip limit of y-shaped ring shrink the disengaging housing, formed the gas gap, air pressure enters in the cavity B thus, be assigned to air receiver and cavity C, cavity C internal gas pressure enters compressed air brake cylinder through the tang of emergency piston and air intake valve by cavity F again, carries out the insurance braking; 2, increase along with air supply pipe air pressure, cavity A increases the pressure of emergency piston, emergency piston moves down, the spring that press-fits between emergency piston bottom and the housing is compression thereupon also, when air supply pipe and cavity A internal gas pressure reach certain value, the upper surface closure of projection on the emergency piston and air intake valve, close tang, seal with air intake valve, along with emergency piston continue move down, air intake valve separates with the annular tang of piston base, forms exhaust clearance, at this moment the air pressure of compressed air brake cylinder returns cavity F, and passes the exhausr port exhaust to atmosphere of the exhausr port of air intake valve through housing bottom; 3, when chaufeur brakes, the control air pressure of control tube enters cavity H, piston moves down, close the exhausr port of air intake valve by the annular tang of piston base, when continuing to move down, the length of spring compressed of the inner suit of emergency piston, projection on the emergency piston is separated with the upper surface of air intake valve, open tang, at this moment the air pressure in the air receiver enters compressed air brake cylinder through cavity B, C, F successively, carries out braking; When brake off, control tube and cavity H internal gas pressure lost efficacy, cavity F internal gas pressure is upwards passed piston, the spring of the inner suit of emergency piston opens simultaneously, make annular tang break away from air intake valve by piston base, form exhaust clearance, successively through the exhausr port of air intake valve, the exhausr port exhaust to atmosphere of housing bottom, at this moment remove by braking pressure by cavity F for the air pressure of compressed air brake cylinder; 4, the braking of the insurance in the running car, under steam when air supply pipe and cavity A internal gas pressure are lower than certain value, the spring that press-fits between emergency piston bottom and the housing opens and promotes to move on the emergency piston, the upper surface of air intake valve and the annular tang conflict of piston base are closed, when moving on emergency piston continues, the projection on the emergency piston is separated with the upper surface of air intake valve, opens tang, braking pressure enters compressed air brake cylinder through cavity B, C, F successively from air receiver, carries out the insurance braking; 5, the braking of dying, when air supply pipe disconnect the back, when cavity A internal gas pressure is zero, cavity B internal gas pressure opens the lip limit of y-shaped ring, forms one-way sealing, all the other principles are with 4.

The utility model compared with prior art, because the diameter of cavity H is greater than the diameter of cavity F, make the braking pressure of trailer under the same pressure just be higher than the braking pressure of tractor truck, remedied that the trailer braking protection valve pipeline is long, automobile and trailer brake nonsynchronous defective, can be used in brake piping separately less than 6 meters vehicle, also can cooperate the dual circuit trailer braking valve, be used in new and old type trailer, superimposed trailer, particularly the extended type superimposed trailer is simple and reasonable, and is easy to manufacture, easy for installation, channel diameter is big, and braking rapidly, and is stable and reliable for performance.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

The specific embodiment

Among the figure: 1, piston 2, annular tang 3, air intake valve 4～5, spring 6～7, exhausr port 8, y-shaped ring 9, emergency piston 10, projection 11, housing 12, loam cake 13, tang 14～16, admission port 17, gas port 18, seal ring

Housing 11 is fixedly connected with the loam cake 12 that is positioned at housing 11 upper ends, its bottom is provided with exhausr port 7, be provided with the piston 1 and the inside that are tightly connected with it in the housing 11 successively and be with air intake valve 3, the emergency piston 9 of spring 4, the upper end cylindrical of emergency piston 9 is set with y-shaped ring 8 and housing 11 sealings, be pressed with spring 5 between its bottom and the housing 11, emergency piston 9 is provided with projection 10 corresponding to the upper surface of air intake valve 3, projection 10 constitutes tang 13 with the upper surface of air intake valve 3, piston 1 adopts step, constitute 2 grades of sealings through seal ring 18 and housing 11, the bottom of piston 1 is provided with exhausr port 6 upper ends that annular tang 2 covers on air intake valve 3, the internal diameter staged of housing 11 reduces, loam cake 12, housing 11, piston 1, emergency piston 9 forms cavity H successively, F, A, B, C, and the diameter of cavity H is greater than the diameter of cavity F, wherein cavity H is communicated with control tube through admission port 14, cavity F is communicated with compressed air brake cylinder through gas port 17, cavity A is communicated with air supply pipe through admission port 15, cavity B is communicated with air receiver through admission port 16, and cavity B communicates with cavity C.

The utility model biggest advantage is the braking pressure ratio that has changed tractor truck and trailer, remedied that the trailer braking protection valve pipeline is long, automobile and trailer brake nonsynchronous defective, can be used in brake piping separately less than 6 meters vehicle, " dual circuit trailer braking valve " patent that also can cooperate our company, be used in new and old type trailer, superimposed trailer, extended type superimposed trailer particularly can be reliable and stable.

Claims (1)

1, a kind of dual circuit trailer emergency relay valve, comprise housing (11) and be positioned at the loam cake (12) of housing (11) upper end, be provided with the piston (1) and the inside that are tightly connected with it in the housing (11) successively and be with air intake valve (3), the emergency piston (9) of spring (4), and form cavity H successively, F, A, B, C, cavity H wherein, F, A, B correspondence and control tube, compressed air brake cylinder, air supply pipe, air receiver communicates, cavity B communicates with cavity C, be pressed with spring (5) between emergency piston (9) bottom and the housing (11), it is characterized in that: the internal diameter staged of housing (11) reduces, the diameter of cavity H is greater than the diameter of cavity F, piston (1) adopts step, its bottom is provided with on the exhausr port (6) that annular tang (2) covers on air intake valve (3), and through 2 grades of sealings of seal ring (18) and housing (11) formation, the upper end cylindrical of emergency piston (9) is set with y-shaped ring (8) and housing (11) sealing, and the upper surface that emergency piston (9) is provided with projection (10) and air intake valve (3) constitutes tang (13).

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