Two-stage and three-stage spot brake master valve with strainer for Dawei series

Abstract

The invention discloses a two-stage and three-stage snub brake main valve provided with a filter screen for Dawei series. The snub brake main valve comprises a pedal seat, an upper body and a lower body which are sealed and fixed together, wherein a balance piston sleeves the upper part of an inner cavity of the upper body; a first stage balance spring sleeves the outer part of a spring clamp sleeve, and a second stage balance spring sleeves the inner part of the spring clamp sleeve; an upper valve seat is clamped and fixed at the inner side of the wall of an upper valve by an elastic check ring, and a lower valve seat is clamped and fixed at the inner side of the wall of a lower valve by another elastic check ring. The filter screen of a valve core of a brake valve in the invention is simple in structure and convenient to install, and can be arranged outside the valve core of the brake valve, especially, the valve core of the brake main valve; the filter screen is directly arranged around the valve core, a solid shell carried in gas can be prevented from entering the valve core, so that the work reliability of the valve core is greatly improved; therefore, the brake accidents can be avoided.

Description

technical field [0001] The invention relates to the technical field of parts and components of automobile brake valves, in particular to a two-stage and three-stage point brake main valve with a filter screen for Dawei series. Background technique [0002] The braking system of trucks and heavy-duty vehicles in the prior art brakes too quickly, and the foot feel is not easy to control, which will easily cause the brake pads to heat up rapidly, resulting in carbonization, which directly affects the braking effect. bias, affecting the overall stability, resulting in insecurity, or unnecessary economic losses. In order to solve these braking problems of trucks, our unit has successively proposed a series of patents on the two-stage brake master valve and the three-stage balance piston assembly, such as the invention patent with the publication number CN 101837774 A, which can output "secondary point brake". The principle of "point brake" can make the compressed air form pulse...

AI Technical Summary

Problems solved by technology

The key component in the above patent is the spring ferrule. Due to the special shape of the spring ferrule and the complicated processing technology, it needs to be finished on a lathe after casting, and the cost is relatively high.

The precision dimension of the spring ferrule has high requirements, and the defective rate is very high after inspection.

In addition, due to the poor compatibility of various components, there is also the problem of complex installation process, and the test performance after installation is different, and the regularity is poor, which needs to be improved

[0003] At present, there are generally filters in the pipeline of the braking system, which are used to filter the solid particle impurities flowing with the gas in the air pipe, so as to ensure that each braking component is not affected by solid particle impurities and ensure the reliability of its work. However, due to the distance between the filter and the spool of each valve, it cannot be avoided that the filtered gas will be polluted by other newly generated solid particles before entering the spool. Sometimes solid particles will still enter the spool and affect the spool. The airtightness caused by air leakage accidents, a new solution needs to be put forward

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