CN2851042Y - Adjustable relay valve - Google Patents

Abstract

The utility model discloses a relay valve with adjustable leading quantity, which comprises an upper cover (8) and a casing (1), wherein a piston (6), an air inlet valve (4), an air vent valve (5), a spring (3) and a valve seat (21) are arranged in a cavity which is composed of the upper cover and the casing; the spring is arranged on the valve seat; the piston causes the cavity which is composed of the upper cover and the casing to be divided into a control cavity (9) and a braking cavity (10); the outer wall of the piston and the casing are formed into a leading cavity (11). The utility model is characterized in that an adjusting cavity is arranged on the casing, a valve (13), a spring (14) and a spring seat (15) are orderly arranged in the adjusting cavity, and the valve, the spring and the spring seat are contacted orderly. A bolt (16) is arranged on the adjusting cavity, and is connected with the spring seat. The valve causes the adjusting cavity to be divided into a pressure storage cavity (18) and a transition cavity (17), the pressure storage cavity is communicated with the braking cavity and the transition cavity is communicated with the leading cavity. The utility model adjusts the size of the transition cavity through the adjustment of the bolt, the superposed pressure of the braking cavity and the leading cavity is controlled, therefore the size of the leading quantity can be changed.

Description

The adjustable relay valve of preceding more amount

[technical field]

The utility model relates to the adjustable relay valve of a kind of preceding more amount, belong to the automobile brake technical field.

[background technology]

At present, be applied in relay valve in the brake system of car, its preceding more amount all is uncontrollable.Look into Chinese patent, publication number is the utility model patent of CN2592460, it is to describe like this: " a kind of preceding more relay valve; comprise loam cake; the piston that sets gradually in the cavity that housing and loam cake and housing constitute; intake and exhaust valve and valve seat; wherein piston and housing seal; the central authorities of loam cake have control mouthful and are communicated with control chamber more than the piston upper surface, the inlet chamber that the intake and exhaust valve is communicated with admission port, valve seat be arranged on the intake and exhaust valve the bottom and and housing seal, the centre of valve seat is provided with exhausr port and is communicated with the exhaust duct of intake and exhaust valve, between valve seat and intake and exhaust valve, be pressed with valve spring, it is characterized in that piston adopts two-diameter piston, the diameter ladder successively decreases, and its outer wall and housing seal constitute vacuum chamber prevention.”。The relay valve of this structure, the pressure area of its control chamber and brake chamber is fixing unadjustable change, the size of preceding more amount can only design at the requirement of a certain brake piping, and will not be suitable for other pneumatic line, and the vacuum chamber prevention that piston outer wall and housing seal constitute communicates with atmosphere, and the preceding more amount of relay valve is not influenced.

[summary of the invention]

In view of there is the uncontrollable deficiency of its preceding more amount in relay valve of the prior art, the technical problems to be solved in the utility model provides the adjustable relay valve of a kind of preceding more amount.

In order to solve the problems of the technologies described above, the utility model takes following technical scheme to finish: the adjustable relay valve of a kind of preceding more amount, include loam cake and housing, be provided with piston in the cavity that described loam cake and housing constitute, air intake valve, drain tap, spring and valve seat, described spring is installed on the valve seat, described piston is separated into control chamber and brake chamber with the cavity of loam cake and housing formation, the outer wall of described piston and housing constitute ante-chamber more, it is characterized in that described housing is provided with one and regulates cavity, in described adjusting cavity, be provided with valve successively, spring and spring perch, described valve, spring and spring perch contact successively, described adjusting cavity is provided with bolt, this bolt is connected with spring perch, described valve will be regulated cavity and be separated into storage pressure chamber and adapter cavity, described storage presses the chamber to be communicated with brake chamber, described adapter cavity with get over ante-chamber and be communicated with; Equal and the housing seal of described piston, air intake valve and drain tap.

The utility model is after being provided with an adjusting cavity on the housing, and the valve, spring, the spring perch that in regulating cavity, set gradually, by regulating bolt, the size that just can regulate adapter cavity, and come what of the preceding more cavity pressure of control brake chamber input, thereby change the size of preceding more amount; Just can satisfy in the different air brake pipings requirement, thereby strengthen the reliability of brake system of car preceding more amount.

[description of drawings]

Further describe the relevant details of embodiment below more in conjunction with the accompanying drawings.

Fig. 1 is a constructional drawing of the present utility model.

[specific embodiment]

With reference to Fig. 1, the adjustable relay valve of this preceding more amount, include loam cake 8 and housing 1, be provided with piston 6 in the cavity that described loam cake 8 and housing 1 constitute, air intake valve 4, drain tap 5, spring 3 and valve seat 21, described spring 3 is installed on the valve seat 21, described piston 6 is separated into control chamber 9 and brake chamber 10 with loam cake 8 and the cavity that housing 1 constitutes, the outer wall of described piston 6 and housing 1 constitute ante-chamber 11 more, described piston 6, air intake valve 4 and drain tap 5 all seal with housing 1, described housing 1 is provided with one and regulates cavity, in described adjusting cavity, be provided with valve 13 successively, spring 14 and spring perch 15, described adjusting cavity is provided with bolt 16, this bolt 12 is connected with spring perch 15, described valve 13, spring 14, spring perch 15 contacts successively, described valve 13 will be regulated cavity and be separated into storage pressure chamber 18 and adapter cavity 17, described storage is pressed between chamber 18 and the brake chamber 10 and is provided with through hole 19, this through hole 19 will store up presses chamber 18 to be communicated with brake chamber 10, described adapter cavity 17 and more also be provided with through hole 12 between the ante-chamber 11, this through hole 12 is communicated with adapter cavity 17 with ante-chamber 11 more, after storage presses chamber 18 to enter certain gas, air pressure will overcome the power of spring 14 and valve 13 will be opened, thereby gas enters ante-chamber 11 more through adapter cavity 17, at this moment, brake chamber 10 has formed an air pressure with joint efforts with the air pressure of getting over ante-chamber 11 owing to being communicated with, this air pressure is made a concerted effort and the difference of pressure of control chamber 9 has determined the size of preceding more amount, preceding more amount of the present utility model is adjustable to be exactly to come control brake chamber 9 to import what of ante-chamber 11 pressure more by regulating bolt 16, thereby changes the size of preceding more amount.

Principle of work of the present utility model is described below again: glancing impact, the gas that its brake activation valve enters crosses that control mouthfuls 7 enters into control chamber 9 and the upper surface that acts on piston 6, promoting piston 6 moves down, thereby overcome the power of spring 3 and open air intake valve 4, this moment, the gas from admission port 2 entered brake chamber 10, enter storage through through hole 19 again and press chamber 18, after air pressure overcomes the power of regulating cavity inner spring 14, the valve of regulating in the cavity 13 is opened, storage presses the gas in the chamber 18 to enter into adapter cavity 17 by valve 13, the gas of adapter cavity 17 enters into ante-chamber 11 more through through hole 12, and acts on the below of piston 6.Brake chamber 10 forms one with the air pressure of getting over ante-chamber 11 and makes a concerted effort, and this is made a concerted effort and the difference of pressure of control chamber 9 has determined the size of preceding more amount, entering more, the air pressure of ante-chamber 11 can change its size by regulating bolt 16, when regulating bolt 16, the compression degree of spring 14 has determined the size of valve 13 openings, and valve 13 openings are big more, and the pressure from brake chamber 10 to ante-chamber 11 more is also just big more, brake chamber 10 and more ante-chamber 11 make a concerted effort just more for a short time with the difference of pressure of control chamber 9, its preceding more amount is just more little.Otherwise, then big more.During brake off, control mouthful 7 emptyings, piston 6 is up under the effect from the atmospheric pressure of compressed air brake cylinder, and at this moment, drain tap 5 is opened, and simultaneously, air intake valve 4 is closed under the effect of spring 3, and the air pressure of compressed air brake cylinder is from exhausr port 20 exhaust to atmospheres.

Claims (2)

1, the adjustable relay valve of a kind of preceding more amount, include loam cake (8) and housing (1), be provided with piston (6) in the cavity that described loam cake (8) and housing (1) constitute, air intake valve (4), drain tap (5), spring (3) and valve seat (21), described spring (3) is installed on the valve seat (21), described piston (6) is separated into control chamber (9) and brake chamber (10) with loam cake (8) and the cavity that housing (1) constitutes, the outer wall of described piston (6) and housing (1) constitute ante-chamber (11) more, it is characterized in that described housing (1) is provided with one and regulates cavity, in described adjusting cavity, be provided with valve (13) successively, spring (14) and spring perch (15), described valve (13), spring (14) and spring perch (15) contact successively, described adjusting cavity is provided with bolt (16), this bolt (16) is connected with spring perch (15), described valve (13) will be regulated cavity and be separated into storage pressure chamber (18) and adapter cavity (17), described storage presses chamber (18) to be communicated with brake chamber (10), described adapter cavity (17) with get over ante-chamber (11) and be communicated with.

2, the adjustable relay valve of preceding more amount according to claim 1 is characterized in that described piston (6), air intake valve (4) and drain tap (5) all seal with housing (1).