CN2225405Y - Pneumatic brake control valve for vehicles - Google Patents

Abstract

The utility model relates to a control valve mainly used for pneumatic braking for vehicles and trailers, which is composed of a base, a main valve body, an auxiliary valve body and a press plate, wherein each valve body is composed of a casing, a spring valve and a piston column. The part of the piston column of the main valve is hollow inside, a lateral air hole is used for communicating with an air path, and a front sealing ring and a back sealing ring are arranged. The main valve controls the on-off of the braking air path, and the auxiliary valve is used for discharging the air. The utility model has the advantages of simple structure, safe and reliable control, small size, light weight and easy maintenance.

Description

The vehicle air brake control valve

A kind of vehicle air brake controls mainly is meant a kind of control cock that automobile, tractor trailer compressed air brake are used that is used for.

In the prior art, be used for vehicle trailer drum-type air brake control valve, braking is sensitive reliable, and can be according to stretcher Stroke Control output tolerance, and weak point is, structure is complicated, and size, weight are big, and inconvenient driver oneself overhauls.

The utility model purpose provides a kind of new vehicle air brake control valve, and it is simple in structure, makes easily, and size, weight are little, easy access, and deceleration and stopping performance is good, overcomes the deficiency of prior art.

Technical solutions of the utility model are, designed control cock, constitute with leading, pay two valve bodies (2), (3) and being connected tracheae (4) and pressing plate (6) by base (1), having bearing pin (7) and base to live in the middle part of the pressing plate (6) connects, there are limited screw (8) and (10) in two ends, one end is provided with extension spring (5), and the other end is stretcher (a 12) acting point; Two valve bodies constitute by housing and piston boit, and step-like cavity is arranged in the housing longitudinal center, and the spring (20) of top setting-in valve (21) is seated on the step, and when valve (21) was pressed in piston column sleeve one end step, valve cut out; Main valve housing (2) has air gate (15), this hole longitudinally is the prolate rectangular aperture in inner walls, establish forward and backward seal ring (18) and (19) on the piston boit, in the end of post longitudinal center's cavity is arranged, post jamb has horizontal pore (22) and (23) to be communicated with external cavity in the post jamb; Pay valve housing (3) induction opening (16) and deflation hole (17) are arranged.

Below in conjunction with drawings and Examples in detail the technical program is described in detail:

Fig. 1 is the utility model scheme drawing

Fig. 2 is the main valve body cutaway view

Fig. 3 is for paying the valve body cutaway view

Fig. 4 control cock action scheme drawing

As shown in drawings, this control cock is by base (1), and two valve bodies and connection tracheae (4) thereof and pressing plate (6) constitute, the effect of main valve (2) is that the control pressure gas enters the trailer braking protection valve air chamber, make it braking, after the effect of pair valve (3) is brake off, provide the drain passageway of gas in the compressed air brake cylinder; Pressing plate (6) moves under the effect of extension spring (5) and stretcher (12), controls closing and opening of two valves.There are bearing pin (7), two ends limit a screw (8) and (10) in pressing plate middle part, and extension spring (5) plays the effect of pressing plate return, after removing brake, pressing plate is return under the extension spring effect, and main valve is closed, press off and pay valve, the pressurized air of trailer braking protection valve air chamber is discharged by paying valve outlet hole (17).Essential structure main, that pay valve is the same, constitute by housing (2), (3) and piston boit (9), (11), housing longitudinal center is step-like cavity, spring (20) is seated on inner walls one ring-shaped step, its top setting-in valve (21), gas circuit was closed when valve (21) was pressed against piston column sleeve one end step under action of the spring, and valve is made by elastomeric material or for the rubber layer of applying ointment or plaster on the metal base, makes for the rubber layer of applying ointment or plaster on the metal base among the embodiment.Difference main, that pay valve is: the main valve shell wall has injection well (15), and this hole longitudinally is the prolate rectangular aperture at inwall, and pay a valve housing two holes is arranged, i.e. induction opening (16) and deflation hole (17); In main valve piston post one end center cavity is arranged, post jamb has horizontal pore (22) and (23) to be communicated with external cavity in the post jamb, and laterally pore (22) and (23) are respectively 2-4, are respectively 3 among the embodiment; Establish forward and backward seal ring (18) and (19) on the piston boit, laterally pore (23) position is gone between two seal rings, distance is 15-20MM between two seal rings, embodiment is 15MM, and the width of seal ring (19) is 10-15MM, and embodiment is 12MM, the prolate inner opening length of injection well (15) is 6-10MM, embodiment is 10MM, and during the valve closed condition, the sealed circle of opening (19) seals within the injection well (15); Seal ring (19) is made for metal or for the elastomeric material of applying ointment or plaster on the Metal Substrate, and embodiment is a metallic material; Seal ring (18) is made for the rubber layer of applying ointment or plaster on the Metal Substrate, and glancing impact seal ring (18) plays main sealing function.Paying the valve piston post is solid garden post, does not establish seal ring.

The control cock course of action: non-braking mode, pressing plate press off pays valve, and main valve is closed, and shown in accompanying drawing 4 it (a), this moment, the gas of compressed air brake cylinder can pass through tracheae (14), and---paying valve chamber---got rid of by deflation hole (17); Glancing impact, the stressed action of pressing plate presses an end of piston boit (11) to lift, and the other end is pressed to piston boit (19), when pressing plate is parallel with base, shown in accompanying drawing 4 it (b), pays valve and is closed by unlatching, and main valve is still located former closed condition; Then, pressing plate is depressed piston boit (9), main valve open, pressure gas just enters the main valve cavity by tracheae (13) in the air tank,---the horizontal pore of piston boit (22)------laterally------injection well (15)-connections tracheae (4)---is paid valve chamber---tracheae (14)---and is arrived the brake drum compressed air brake cylinder pore (23) the piston boit center cavity by induction opening (16) through valve (21) air gap all around, producing braking, more than is the sudden stop braking procedure.Slow down as need, when braking slowly, the utility model can be realized the function according to pedal stroke control brake tolerance size, because of injection well (15) is the prolate rectangle at valve wall inner opening, the gross area equals the gas piping gross area, this prolate opening, at non-glancing impact, sealed circle (19) block is lived, action with pedal (12), piston boit (9) is moved to left, and seal ring (19) also moves to left, and valve is opened gradually, the prolate inner opening in hole (15) is also open-minded gradually, it is relevant with the piston boit stroke, promptly relevant with the stretcher stroke to open size, because of the unlatching size of the prolate inner opening of hole (15), air-flow is produced different resistances, so the gas pushing quantity difference.Certainly, also can take a brake, realize slowing down, braking slowly.

During enforcement, valve housing is made as left and right sides two parts, by the screw thread hinge joint, is convenient to make and maintenance, and its right half can be made as one with base.Main valve piston post (9) can be by screw thread hinge joint assembling with forward and backward seal ring, also can be according to different controlled object, after parameter is fixed piston boit and seal ring are processed into one, just before seal ring (18) one deck elastomeric material of must on the metal basal plane, applying ointment or plaster so that good seal; Should guarantee to press off a pair valve during extension spring (5) return; The adjustment of limited screw (8) and (10), the control travel of adjustable foot free pedal travel and piston boit.Connecting tracheae (4) can have the holding screw of vent passage to be fastened on the housing by interior.This valve arrangement is simple, and weight only is 1/3rd of the existing control cock of same specification, control safe and reliablely, and maintenance is hung enforcement in the braking easily behind 50 trac.s.

Claims (3)

1, vehicle air brake control valve comprises base (1) and valve body, it is characterized in that, valve body divides main valve body (2) and pays valve body (3), between connection tracheae (4) is arranged; Also comprise pressing plate (6), its two ends are provided with limited screw (8) and (10), live with base by bearing pin (7) and connect in the middle part, and an end has extension spring (5); Master, pair valve body have step-like cavity by housing (2) and (3) and piston boit (9) and (11) formation in the housing longitudinal center, spring (20) is seated on the end step, its top setting-in valve (21); Main valve housing (2) has pore (15), longitudinally is the prolate rectangular aperture in inner walls, establishes seal ring (18) and (19) on the piston boit (9), in post (9) one ends longitudinal center's cavity is arranged, and post jamb has horizontal pore (22) and (23) to be communicated with external cavity in the post jamb; Pay valve housing (3) pore (16) and (17) are arranged.

According to the described vehicle air brake control valve of claim 1, it is characterized in that 2, the horizontal pore (22) of main valve piston post (9), (23) have 2-4 respectively; Pore (23) is positioned between seal ring (18), (19); Distance is 15-20MM between seal ring (18), (19); Long 6-the 10MM of pore (15) prolate rectangle inner opening; Seal ring (19) width is 10-15MM; During non-braking state, the sealed circle of pore (15) inner opening (19) sealing.

According to claim 1 or 2 described vehicle air brake control valves, it is characterized in that 3, valve (21) is made for elastomeric material or for the rubber layer of applying ointment or plaster on the metal base; Seal ring (19) is made for metallic material or for the rubber layer of applying ointment or plaster on the Metal Substrate; Seal ring (18) is made for the rubber layer of applying ointment or plaster on the Metal Substrate.

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