CN2813391Y - Semiautomatic variable first pressing ratio brake valve two-stage piston - Google Patents

Abstract

The utility model relates to a semiautomatic variable initial-pressure ratio two-stage piston of a brake valve. A first stage balancing piston (8) is installed in a valve body (4) on which an air inlet and outlet hole (5) with variable initial-pressure ratio is arranged, a secondary balancing piston sleeve (9) is installed on the first stage balancing piston (8) in which a push shaft fork (6) is installed, a clamp spring (7) is installed in a flute of the first stage balancing piston (8) on the top of the push shaft fork (6), a dust-proof rubber cover (2) is installed on the push shaft fork (6) and the valve body (4) and limited by a clamp spring (3) which is installed on the valve body (4), a rubber spring (10) is installed between the first stage balancing piston (8) and the push shaft fork (6), and the lower part of the first stage balancing piston (8) is provided with a return spring (1). The utility model can fully use the conversion effect of brake force and adhesive force so as to shorten the brake distance and hysteresis quality, avoid vehicle side slip, lighten labor intensity, increase stable and smooth driving, and achieve optional follow-up operation control. Therefore, the utility model has the advantages of high safety and wide adaptability.

Description

The variable pressure ratio brake activation valve second piston just of S. A.

Technical field: the utility model relates to the control cock of auto brake system, the variable pressure ratio brake activation valve second piston just of particularly a kind of S. A..

Background technology: the automobile of air pressure and supercharging air oil brake system in the present technology, brake control valve all is with fixing particular value, control the work and the usefulness of whole brake system of car, and be in specific road conditions condition, do not add the additional facilities automobile with zero load, front and rear wheel braking force and car load braking force are designed into the ideal Distribution characteristic, and each valve automatically regulating seldom often compares P with front and back wheel air pressure ₂/ P ₁=1 is a constant, decides the distribution of the various performances of automobile brake, automobile one place in operation by the first pressure ratio size of brake control valve, additional facilities is got all the ready, and axle just carries and changes, and distributing with Ideal Characteristics just has very big difference, since heavy duty, the speed of a motor vehicle, road, the variation of weather, outstanding exposure stopping distance and time, hysteresis quality increases, the random servo-actuated of operation control is difficult to be implemented under the comparatively ideal state and carries out, and zero load as a result has well smooth-going, arbitrarily servo-actuated, and heavily loaded stopping distance and time, hysteresis quality is all very big, meets overcast and rainy road to slide, the muddy shape operation control of freezing in road surface, arbitrarily servo-actuated, comformability is better, and Here it is brake control valve is the low pros and cons place of pressure ratio just, roughly unloaded, coordinate, ride comfort is poor, heavy duty stopping distance and time, hysteresis quality is less, and it is better to operate random servo-actuated, brake pedal is heavy, it is sliding to meet overcast and rainy road, muddy freezing, and the road surface is operated controlled poor, loses stability and safe reliability, Here it is brake control valve is the high pros and cons place of pressure ratio just.

Summary of the invention: the purpose of this utility model is to provide a kind of S. A. variable pressure ratio brake activation valve second piston just, it is that the valve of a fixed value is made the valve that can be changed into two first pressing ratios, thereby improve comformability that various loadings, the speed of a motor vehicle, road use climatically, operation control, arbitrarily servo-actuated and safe reliability, reduce labor intensity, improve economic travelling speed and benefit.

Formation of the present utility model: by the one-level dummy piston, secondary dummy piston cover, rubber spring, the push shaft fork, valve body, variable pressure ratio port just, retracing spring and dustproof Jiao Gai form, one-level dummy piston 8 is installed in the valve body 4, variable pressure ratio port 5 is just arranged on valve body 4, secondary dummy piston cover 9 is installed on the one-level dummy piston 8, push shaft fork 6 is installed in the one-level dummy piston 8, in one-level dummy piston 8 grooves above push shaft fork 6 jump ring 7 is installed, dustproof glue lid 2 is installed on push shaft fork 6 and valve body 4, spacing by the jump ring 3 that is installed on the valve body 4, at one-level dummy piston 8 with push away between the fork shaft 6 rubber spring 10 is installed, retracing spring 1 is housed below one-level dummy piston 8.

On the circumference of push shaft fork 6 and 8 cooperations of one-level dummy piston, O RunddichtringO 11 is housed, on one-level dummy piston 8 and cylindrical that valve body 4 cooperates, O RunddichtringO 11 is housed, on secondary dummy piston cover 9 and endoporus that one-level dummy piston 8 cooperates and with cylindrical that valve body 4 cooperates on O RunddichtringO 11 is arranged.

Compared with the prior art, the utility model can make full use of the conversion effect of braking force and adhesive ability, shortens stopping distance and hysteresis quality, prevent the skid whipping, reduce labor intensity, improve the train stability ride comfort, wide adaptability, the random servo-actuated of operation control, safe and reliable.

Description of drawings: Fig. 1 is the utility model structural representation; Fig. 2 is one-level dummy piston, valve body and secondary dummy piston cover enlarged drawing.

1. retracing springs among the figure, 2. dustproof Jiao Gai, 3. jump ring, 4. valve body, 5. variable pressure ratio port just, 6. push shaft fork, 7. jump ring, 8. one-level dummy piston, 9. secondary dummy piston cover, 10. rubber spring, 11.O RunddichtringO.

The specific embodiment: as shown in Figure 1 and Figure 2, one-level dummy piston 8 is installed in the valve body 4, variable pressure ratio port 5 is just arranged on valve body 4, secondary dummy piston cover 9 is installed on the one-level dummy piston 8, push shaft fork 6 is installed in the one-level dummy piston 8, in one-level dummy piston 8 grooves above push shaft fork 6 jump ring 7 is installed, dustproof glue lid 2 is installed on push shaft fork 6 and valve body 4, spacing by the jump ring 3 that is installed on the valve body 4, between one-level dummy piston 8 and push shaft fork 6, rubber spring 10 is installed, retracing spring 1 is housed below one-level dummy piston 8.

On the circumference of push shaft fork 6 and 8 cooperations of one-level dummy piston, O RunddichtringO 11 is housed, on one-level dummy piston 8 and cylindrical that valve body 4 cooperates, O RunddichtringO 11 is housed, on secondary dummy piston cover 9 and endoporus that one-level dummy piston 8 cooperates and with cylindrical that valve body 4 cooperates on O RunddichtringO 11 is arranged.

Claims (2)

1. the variable pressure ratio brake activation valve second piston just of a S. A., by the one-level dummy piston, secondary dummy piston cover, rubber spring, the push shaft fork, valve body, variable pressure ratio port just, retracing spring and dustproof Jiao Gai form, it is characterized in that: one-level dummy piston (8) is installed in the valve body (4), variable pressure ratio port (5) is just arranged on valve body (4), secondary dummy piston cover (9) is installed on the one-level dummy piston (8), push shaft fork (6) is installed in the one-level dummy piston (8), jump ring (7) is installed in one-level dummy piston (8) groove of push shaft fork (6) top, go up the dustproof Jiao Gai (2) of installation at push shaft fork (6) and valve body (4), spacing by the jump ring (3) that is installed on the valve body (4), at one-level dummy piston (8) with push away rubber spring (10) is installed between the fork shaft (6), retracing spring (1) is housed in the below of one-level dummy piston (8).

2. the variable pressure ratio brake activation valve second piston just of S. A. according to claim 1, it is characterized in that: on the circumference of push shaft fork (6) and one-level dummy piston (8) cooperation, O RunddichtringO (11) is housed, on one-level dummy piston (8) and cylindrical that valve body (4) cooperates, O RunddichtringO (11) is housed, on secondary dummy piston cover (9) and endoporus that one-level dummy piston (8) cooperates and with cylindrical that valve body (4) cooperates on O RunddichtringO (11) is arranged.

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