CN201040526Y

CN201040526Y - Relay valve

Info

Publication number: CN201040526Y
Application number: CNU2007201089164U
Authority: CN
Inventors: 傅晓辉; 鲍绍建; 楼钟华
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-08
Filing date: 2007-05-08
Publication date: 2008-03-26
Anticipated expiration: 2017-05-08

Abstract

The utility model relates to a relay valve, in particular to a relay valve used in vehicle, comprising a valve assembly, a valve cover, a piston and so on. The valve assembly is provided with an input air pressure inlet port, an output air pressure port, an exhausting port, a valve, and a spring; the valve cover is provided with a control air pressure inlet port; a piston is arranged in the valve assembly and the valve assembly, an air cavity 3 is formed between the valve assembly and the piston, an air cavity 1 is formed between the valve cover and the piston; an air cavity 2 is formed between the valve assembly, the valve cover and the piston, an electromagnetic valve is arranged on the valve cover, which is provided with an exhausting hole; the air cavity 2 is communicated with the control air pressure cavity on the valve cover or the exhausting hole on the electromagnetic valve on the valve cover, which is controlled by the electromagnetic valve. When the vehicle is unloaded, the electromagnetic valve works, the relay valve of the utility model plays a role of common relay valve; when the vehicle is heavy loaded, the electromagnetic valve does not work, by the effect of the air cavity 2, the pressure establishing time of the later braking partial pump can be greatly shortened, the relay valve plays a role of amplifying. The situation is very favorable to the braking of the vehicle of heavy load, especially overload or overspeed.

Description

A kind of relay valve

Technical field

The utility model relates to a kind of relay valve, and what be specifically related to is the relay valve that uses on a kind of automobile.

Background technology

In the brake system of autotruck, relay valve works to shorten reaction time and pressure setting time.Relay valve is used for the end of long pipe runs, makes the pressurized air of air receiver be full of compressed air brake cylinder fast.The control air pressure of relay valve is from master brake cylinder (series connection valve or dual-chamber brake).Because master brake cylinder is long to the pipeline of relay valve, there is the partial pressure loss in long pipe runs simultaneously, and therefore, the control air pressure that acts on the relay valve of rear brake is set up slower; And the braking pressure of front brake directly comes from master brake cylinder, and the tracheae pipeline is shorter, and air pressure setting time is very fast and lose little.And the output pressure of relay valve (be used for back braking) and control air pressure from master cylinder are in the ratio output that approaches 1: 1, because the existence of long pipe runs, with respect to preceding brake cylinder, the pressure of rear braking subpump is longer setting time, reacts also slower.So the use of this class relay valve is comparatively unfavorable for the braking of heavy goods vehicles, especially vehicle is when overload, hypervelocity.

The utility model content

Problem to be solved in the utility model is: same relay valve can adapt to automobile when zero load and the different situations requirement in when heavy duty preferably.

The problem that will solve of the present utility model is achieved in that a kind of relay valve, comprises valve body assembly, valve gap, piston etc.; Input air pressure inlet, output pressure mouth, exhausr port are arranged on the valve body assembly, valve, spring are arranged; Control air pressure inlet is arranged on the valve gap; In valve body assembly and the valve gap piston is arranged, form air cavity 3 between valve body assembly and the piston, form air cavity 1 between valve gap and the piston.Form air cavity 2 between described valve body assembly, described valve gap and the described piston, on the described valve gap electromagnetic valve is arranged, on this electromagnetic valve deflation hole is arranged; Air cavity 2 is by the aperture on the described piston, again by described piston middle cavity, with control atmospheric pressure cavity on the described valve gap or with described valve gap on electromagnetic valve on deflation hole link to each other, connected sum osed top conversion therebetween is by the solenoid control on the described valve gap.

Owing to adopted such scheme, when vehicle was unloaded, electromagnetic valve worked, and made relay valve only play conventional relay valve; When the vehicle heavy duty, electromagnetic valve is not worked, control air pressure is entered air cavity 2 by air cavity 1 valve port is sealed in the plug lower end under the spring force effect, control air pressure can't enter air cavity 2, under the effect of control air pressure, piston moves down, and opens the valve on the valve body assembly, and input air pressure enters air cavity 3 backs and forms output pressure to brake cylinder; Because air cavity 2 no air pressure, active area is greater than active area below the piston above the piston, output pressure thereby greater than control air pressure (increasing more than 50% approximately), like this, just can shorten rear braking subpump pressure setting time widely, relay valve has played amplification.This situation is to the vehicle heavy duty, especially overloads, the braking when exceeding the speed limit is highly beneficial.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the assembly drawing of a kind of relay valve of the present utility model;

Among the figure: 1, electromagnetic valve, 2, plug, 3, valve gap, 4, piston, 5, valve body assembly, 6, valve, 7, aperture, a, air cavity 1b, air cavity 2c, air cavity 3

The specific embodiment

In Fig. 1, when vehicle was unloaded, a kind of relay valve of the present utility model played general relay valve, at this moment, electromagnetic valve work moves away the valve port of lower end and seals deflation hole on the electromagnetic valve on the plug 2 of electromagnetic valve 1, control air pressure enters air cavity 1 and the middle cavity by piston 4 by control air pressure inlet, enter air cavity 2 by aperture 7 again,, under gas pressure, piston 4 moves down opens valve 6, input air pressure enters air cavity 3 backs and forms output pressure to brake cylinder; Because active area is near equating that output pressure approaches to control air pressure about in the of 4 for the negative function of air cavity 2, piston, this moment, relay valve was identical with the effect of general relay valve.

In Fig. 1, when the vehicle heavy duty, electromagnetic valve is not worked, control air pressure is entered air cavity 2 by air cavity 1 valve port is sealed in plug 2 lower ends under the spring force effect, control air pressure can't enter air cavity 2, and under the effect of control air pressure, piston 4 moves down, open the valve 6 on the valve body assembly 5, input air pressure enters air cavity 3 backs and forms output pressure to brake cylinder; Because air cavity 2 no air pressure, active areas are greater than active area below the piston above the piston 4, output pressure thereby greater than control air pressure (increasing more than 50% approximately), like this, just can shorten rear braking subpump pressure setting time widely, relay valve has played amplification.

In addition; need to prove; for technical personnel under the industry; relay valve of the present utility model can also have many equivalences to change; as the variation of the valve body assembly structure of relay valve, and the variation of piston structure, the variation of valve cover structure; variation of electromagnetic valve structure or the like, these equivalent variations all should belong among the protection domain of a kind of relay valve of the utility model.

Claims

1. a relay valve comprises valve body assembly, valve gap, piston etc.; Input air pressure inlet, output pressure mouth, exhausr port are arranged on the valve body assembly, valve, spring are arranged; Control air pressure inlet is arranged on the valve gap; In valve body assembly and the valve gap piston is arranged, form air cavity 3 between valve body assembly and the piston, form air cavity 1 between valve gap and the piston, it is characterized in that: form air cavity 2 between described valve body assembly, described valve gap and the described piston, on the described valve gap electromagnetic valve is arranged, on this electromagnetic valve deflation hole is arranged; Air cavity 2 is by the aperture on the described piston, again by described piston middle cavity, with control atmospheric pressure cavity on the described valve gap or with described valve gap on electromagnetic valve on deflation hole link to each other, connected sum osed top conversion therebetween is by the solenoid control on the described valve gap.