CN2158821Y - Braking valve for trailer of motor vehicle - Google Patents

Abstract

The utility model discloses a braking valve for the trailer of motor vehicles. On base of an original braking valve, the diameter of a gas chamber B is minified to the range of 40 mm to 50 mm. The inner of the gas chamber B is provided with a labyrinth convoluted diaphragm (11) and the working surface (24) of the labyrinth convoluted diaphragm is thinned to the range of 1.0 mm to 1.5 mm. The labyrinth convoluted diaphragm is fixed by a clamping ring (12). A gas chamber C is provided with a non prismatic diaphragm (19) and the working surface (25) of the non prismatic diaphragm (19) is thinned to the range of 1.0 mm to 1.5 mm. A wire diameter is reduced to the range of 4.5 mm to 5.0 mm and a spring diameter is reduced to the range of 25 mm to 30 mm to reduce the stiffness of a counter spring (22). Therefore, the utility model reduces braking resistance, can brake a main vehicle and a trailer simultaneously with small air pressure and has the advantages of high sensitivity, safety and long service life.

Description

Braking valve for trailer of motor vehicle

The utility model relates to a kind of self-propelled vehicle especially for the brake activation valve on the self-propelled vehicle trailer.

Existing vehicle braking valve, need bigger air pressure could guarantee brake, cause is axially with compressing diaphragm seal, because diaphragm is thick, make the stressed back of diaphragm edge produce packing phenomenon, also because the various factors such as balance spring stiffness height that adopt, make the action of valve dumb, do not guarantee dynamic and static characteristic level and smooth, so when self-propelled vehicle point brake, the generation trailer hysteresis phenomenon of braking.

The purpose of this utility model provides a kind of improved master's car and the synchronous self-propelled vehicle trailer braking valve of trailer can guarantee brake of motor-driven vehicle the time.

The purpose of this utility model is achieved in that a kind of self-propelled vehicle trailer braking valve comprises upper casing, loam cake, mesochite, lower casing, dull and stereotyped valve, diaphragm, balance spring, core bar, air chamber etc., particularly the diameter by dwindling the B air chamber reduces the capacity of B air chamber to 40-50mm, realizes quickening the speed of brake step-down; By the B air chamber between upper casing and the mesochite inner chamber has been adopted the labyrinth type corrugated diaphragm, and the control position of labyrinth type corrugated diaphragm, the reduced thickness that is the position in the B air chamber is 1.0-1.5mm, and fix with the plastics hold-down ring, the packing phenomenon that diaphragm produces when eliminating axial compression, C air chamber between mesochite and lower casing inner chamber adopts the variable section corrugated diaphragm, the thickness of its control position also attenuate is 1.0-1.5mm, the resistance that diaphragm produces when reducing axial compression, improve the braking potential of C air chamber, also the steel wire diameter by the balance spring below core bar is reduced into φ 4.5-5.0mm, spring diameter also narrows down to φ 25-30mm, reduces the stiffness of balance spring.Make when brake,, act on the variable section diaphragm along with air pressure enters the C air chamber, make core bar overcome spring resistance B air chamber pressure and move down rapidly, the dull and stereotyped valve of its upper end is sealed gas passage thereupon moving down, make operating air pressure P ₂Discharge P rapidly by the deflation hole in the core bar ₂Differential pressure brakes to zero.

The utility model is owing to dwindled the B air chamber, labyrinth type corrugated diaphragm and variable section diaphragm have been adopted, and the driving surface attenuate of diaphragm with reduced the stiffness etc. of balance spring, thereby reduced the resistance of brake, eliminated the packing phenomenon of diaphragm, make the use of self-propelled vehicle trailer braking valve, realized making the synchronous brake of main car and trailer with less air pressure.And there is brake highly sensitive, safe and reliable, advantages such as long service life.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof;

Fig. 1 is the structural profile scheme drawing of vehicle braking valve.

Fig. 2 is the generalized section of speeding Gong type corrugated diaphragm;

Fig. 3 is the generalized section of variable section diaphragm.

Describe concrete structure of the present utility model and service condition in detail below in conjunction with accompanying drawing.

This self-propelled vehicle trailer braking valve is by the upper casing 2 that is provided with induction opening 3 vents 4 and the mesochite 5 that is provided with braking pore 6, is provided with shell that the lower casing 7 of air extractor vent 23 constitutes is provided with the flap type 9 that is equipped with below loam cake 1, the loam cake 1 with spring 8 controls on shell, flap type 9 is to adopt blanked part to hang rubber structure, the labyrinth type corrugated diaphragm 11 of folder fabric and rubber structure is housed on the core bar 10 between upper casing 2 and mesochite 5 inner chambers, be fixed on core bar 10 upper ends with plastics pressure ring 12, nut 13, clamping ring 14, clamping plate washer 15, constituted the B air chamber.On the core bar 10 between the inner chamber of mesochite 5 and lower casing 7, be equipped with the fixing folder fabric of big pallet 17, little pallet 16, jam nut 18 and the variable section diaphragm 10 of rubber structure and constituted the C air chamber.The balance spring of fixing with spring perch 20 22 is equipped with in core bar 10 lower ends in the inner chamber of lower casing 7, adjusts with adjustable bolt 21.

During use, as self-propelled vehicle paint storage tank air pressure P ₁When entering the A air chamber and entering the B air chamber by passage, gas pressure moves down core bar 10 on labyrinth type corrugated diaphragm 11, and dull and stereotyped valve 4 apertures reduce simultaneously, the equilibrium of pressure of B air chamber pressure and balance spring 22 acts on trailer air pressure P at certain value by vent 4 at this moment ₂On, make self-propelled vehicle and trailer be in the cruising state.

When brake of motor-driven vehicle, pressure P ₃Enter in the C air chamber through braking pore 6, act on the variable section diaphragm 19, core bar 10 is moved down, dull and stereotyped valve 9 moves down simultaneously and seals passage, the pressure P in the vent 4 ₂Discharge rapidly by the deflation hole in the core bar 10, make the trailer air pressure P in the vent 4 ₂Reduce to zero and brake.Remove the pressure P in the braking pore 6 ₃, under balance spring 22 effects, move on the core bar 10, open dull and stereotyped valve 4, the pressure P in the vent 4 ₂Return to rapidly on the original pressure and brake off.

Claims (1)

1, a kind of self-propelled vehicle trailer braking valve mainly comprises upper casing (2), mesochite (5), lower casing (7), loam cake (1), dull and stereotyped valve (9), diaphragm (11), (19), balance spring (22), core bar 10, air chamber A, B, C etc., the diameter that it is characterized in that dwindling the B air chamber is 40-50mm, in the B air chamber, adopt labyrinth type corrugated diaphragm (11), and be its driving surface (24) attenuate 1.0-1.5mm, fixing with plastics hold-down ring (12), in the C air chamber, adopt variable section diaphragm (19), and be its driving surface (25) attenuate 1.0-1.5mm, also by the steel wire diameter of balance spring (22) is reduced into 4.5-5.0mm, balance spring (22) reduced is 25-30mm, reduces the stiffness of balance spring (22).

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