CN2197270Y - Two pipe-way braking valve for vehicle trailer - Google Patents

Abstract

The utility model relates to a two pipe-way braking valve for vehicle trailers, which belongs to the technical field of vehicle brake valves. The utility model is composed of a U-shaped valve which is installed in a cylindrical upper case, an upper stiff piston and a lower stiff piston which are arranged in a tubular lower case, and air inlet and outlet holes which are arranged on the corresponding cases. The utility model has the advantages of simple structure, easy production, easy installation, sensitive action, reliable performance, long service life, light weight, and low price. The existing single pipe-way trailer braking system can be used, and be rebuilt into a two pipe-way trailer braking system; the utility model can be widely used for the two pipe-way braking system for trailers of mid-duty vehicles and heavy-duty vehicles.

Description

Two pipe-way braking valve for vehicle trailer

The utility model belongs to the brake valve of car class.

The braking of the auto trailer that prior art provided, adopt single tube road gas-breaking braking device as many, its weak point be the single tube road die the braking control by trailer braking valve, main line only depend on a main line to realize the inflation and the braking function of dying, so when the continuous glancing impact of automobile, just can't continue to inflate to the trailer air receiver, cause air receiver air pressure to descend continuously, and reduce rate of braking gradually, until the trailer braking protection valve defunctionalization, this is extremely dangerous when the automobile lower long slope.In case the single tube road is malfunctioning, just can't remedies maybe and can't take the emergency braking measure.Make braking unreliable, easy break-down is malfunctioning.The employing emergency relay valve that has at present realizes the trailer dual line braking, i.e. loading line, a brake piping, but when loading line damages and can't inflate to the trailer air receiver, or brake piping gas leakage, damage, trailer can not emergency brake, does not have the effect of double insurance.

The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, providing a kind of can transform trailer single tube road braking and be dual line braking, fault appears damaging when malfunctioning at trailer loading line or brake piping, auto trailer dual circuit brake valve that can emergency brake.

Technical solution of the present utility model in conjunction with the accompanying drawings 1, trailer dual circuit brake valve structural representation, Fig. 2, main, trailer brake system fundamental diagram is described further.

Trailer dual circuit brake valve 37 as shown in Figure 1; it is by cylindrical upper shell 5; there is the valve hole in its central authorities; suitable for reading is screw thread 3; leave the piston axis hole at the bottom of the hole; the annular seal plane 28 of Kong Bianshe projection; sliding dress U-shaped valve 4 in the valve hole, interior dress valve spring 2 is with plug screw 1 and upper shell encapsulation; constitute valve cavity 7; upper shell is radially opened the induction opening 22 of valve cavity 7, and it is circular protective valve sealing surface 24 that tubular projection end is arranged in the hole, induction opening 22 built-in protective valve springs 23; sliding dress spline shape protection valve 25; with adaptor union 27 sealing that air extractor vent 26 is arranged, tangentially setting out pore 6 logical valve cavities 7.Cylindrical shape lower house 21 is at bottom outlet bottom dress exhaust net 18, there is the rigidity lower piston 15 of the axis of the piston central through hole 16 on dress two sides in bottom in the tube, following the axis of the piston inserts in the bottom outlet, constitute cavity of resorption 17, there is the rigidity upper piston 11 of the axis of the piston central through hole 16 on dress two sides, top, the upper piston axle that following the axis of the piston inserts lower piston 15 constitutes lumen 14, the axis of the piston overcoat reinstalls in the bottom outlet of a spring 9 insertion upper shells 5 above the upper piston, leave the circular clearance with bottom outlet, constitute epicoele 8, offer admission port 19 on lower house 21 the same side barrels, 20 logical respectively cavity of resorptions 17, lumen 14, offer intercommunicating pore 12 in the opposite side barrel, under pick out pore 13, on connect oblique air extractor vent 10, last lower house bolt up is together.Valve, last lower piston, the axis of the piston and junction, plane are equipped with rubber seal and form.Upper and lower casing 5,21, valve 4,25, plug screw 1 aluminium alloy material, upper and lower piston 11,15 selects for use zinc alloy material, adaptor union to be fabricated to steel.

Trailer dual circuit brake valve work operation is described as follows in conjunction with Fig. 2:

Normal vehicle operation, whole brake system is in the brake off state, and air compressor 29 produces the wet air receiver 31 of pressurized air input, enters dried air receiver 34 by wet air receiver, has dried air receiver to enter the upper and lower chamber of master brake cylinder 32 again.The pressurized air of trailer is the induction opening 26 that enters trailer dual circuit brake valve 37 from the wet air receiver 31 of main car, enters trailer air receiver 41 by protection valve 25 through induction opening 22, valve cavity 7, air gate 6, separating switch 38, connection valve 39, relay valve 40.The 30th, the braking during standstill switch, the 35th, main, trailer brake application magnet valve, it is a cover electric control, the emergency brake system of dying independently.

During car brakeing, master brake cylinder 32 actions, the brake compression air directly enters main car front and back compressed air brake cylinder 36, enter the admission port 19 of trailer dual circuit brake valve 37 simultaneously, 20, cavity of resorption 17, lumen 14, in the promotion, following stiff piston 11, move on 15, the axis of the piston end face above the rigidity upper piston touches U-shaped valve bottom surface, airtight through hole 16, U-shaped valve 4 is moved simultaneously, pull back spring 9, valve spring 2 is compressed energy storage, the lower plane of U-shaped valve 4 leaves annular seal plane 28 at this moment, pressurized air in the valve cavity 7 enters epicoele 8 from its bottom outlet circular clearance, again by oblique air extractor vent 10, intercommunicating pore 12, air gate 13, separating switch 38, connect valve 39, the epicoele of relay valve 40, its piston moves down opens the relay valve valve, makes the pressurized air in the trailer air receiver 41 enter trailer braking protection valve air chamber 42 through relay valve 40, realizes main, trailer braking protection valve.

The vehicle brake off, master brake cylinder 32 actions, make the lumen 14 of trailer dual circuit brake valve 37, the gas of compressed air brake cylinder 36 is by the road from master cylinder 32 exhaust to atmospheres before and after cavity of resorption 17 and the main car, and lumen 14, air pressure in the cavity of resorption 17 descends, valve spring 2, pull back spring 9 discharges compression can, valve 4 lower planes and annular sealing surface 28 are airtight, on, following stiff piston 11,15 move down return, piston axle heads above the upper piston 11 leave the lower plane of valve 4, the gas of relay valve 40 epicoeles by pipeline through air gate 13, intercommunicating pore 12, oblique air extractor vent 10, epicoele 8, the bottom outlet circular clearance, centre hole 16 is by exhaust net 18 exhaust to atmospheres.The gas of trailer braking protection valve air chamber is realized main, trailer brake off by relay valve 40 exhaust to atmospheres.

Master brake cylinder 32, in, cavity of resorption 14,17 can both control trailer dual circuit brake valve 37, when this valve lumen 14 lost efficacy, rigidity lower piston 15 can promote rigidity upper piston 11 and open valve 4, carry out trailer braking protection valve, when cavity of resorption 17 lost efficacy, rigidity upper piston 11 can directly be opened valve 4, carry out trailer braking protection valve, play the double insurance effect;

Trouble removal, when any one of connecting line between master, trailer can both guarantee the trailer braking of dying when losing efficacy, when the protection valve 25 in the trailer dual circuit brake valve 37 can make stream pressure surpass the pressure of setting, protection valve 25 compression protective valve door springs 23, induction opening 22 is closed, preserve the pressurized air of main car air receiver 31, trouble-shooting is fixed the back blow off valve 33 of the wet air receiver 31 of main car is opened, bleed off pressurized air, protection valve 25, naturally open under the effect of spring 23, close blow off valve 33, vehicle begins to start; Pressurized air enters main, trailer air receiver 31,34,41 by loading line, and vehicle normally moves.

This trailer dual circuit brake valve has following advantage:

1. simple in structure, easy to manufacture, easy for installation, particularly liberate the CA142 automobile under the prerequisite of no any change, do not change assembly technology, connection dimension is in full accord.Adopt this valve to change the single tube road braking of trailer into the trailer dual line braking;

2. the master of dual-line braking system, trailer pipeline air pressure are the synchronization lifting relation, are easy to coordinate main, trailer braking protection valve, have also saved the adjustment link simultaneously;

3. when connecting line between main, trailer any one when losing efficacy, can both guarantee to implement the trailer braking of dying, when protection valve 25 air-flows in the trailer dual circuit brake valve 37 surpass the pressure of setting, close immediately, thereby the pressurized air that effectively keeps the wet air receiver 31 of main car, behind the trouble-shooting, open blow off valve 33, bleed off pressurized air, protection valve 25, under the effect of spring 23, open naturally, close blow off valve 32, vehicle begins to start, Air compressor 29, make wet, dried, extension air receiver 31,34,41 inflation energy storage by loading line, vehicle normally moves;

4. used piston of this valve and valve all are rigidity, and long service life is active in one's movements, easy accessibility, and good maintenance, in light weight, price is low, is the ideal product that substitutes single tube road trailer braking valve;

This trailer dual circuit brake valve can be widely used in trailer dual-line braking system medium-sized, heavy motor vehicle.

Embodiment:

Minimum control air pressure (sensitivity)＜19.8KPa

Trailer braking protection valve is early than main car 0---0.2S

Nominal working pressure: 0.8MPa

Volume length 140 * 80 * 130mm

Quality 1.0kg

Claims (3)

1, the automobile dual circuit brake valve 37; by dress U-shaped valve 4 springs 2 usefulness plug screws 1 sealing in the cylindrical upper shell 5; adorn upper and lower stiff piston 11,15 in the cylindrical shape lower house 21; offer induction opening 22,20,19 on pull back spring 9 respective housings; induction opening 22 built-in protective valves 25 springs 23; 6,13 compositions of air gate is characterized in that having in the lower house 21 upper and lower stiff piston 11,15, and the axis of the piston above the upper piston can be opened U-shaped valve 4.

2,, it is characterized in that dress spline shape protective valve 25 in the said induction opening 22 by the described automobile dual circuit brake valve 37 of claim 1.

3, by the described automobile dual circuit brake valve 37 of claim 1, it is characterized in that said upper and lower casing 5,21, valve 4,25, plug screw 1 aluminium alloy material, upper and lower piston 11,15 is selected zinc alloy material for use.

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