Double pipe electrically-controlled trailer brake valve

Abstract

The invention relates to a dual-tube electric control trailer brake valve, wherein it adds an electromagnetic control valve and a load sensor, based on former valve, throttle valve, upper relay piston assembly, lower relay piston assembly and emergency piston assembly; the inner diameter lower relay piston is decreased stepped; the baffle disc sheathes the outer wall of lower relay piston to be sealed with the inner wall of valve to form vacuum chamber E and pressure adjustable chamber F; the pressure adjust piston is sealed inside the lower relay piston while a pressure adjust spring is mounted between its lower end and the lower relay piston; the side wall of lower relay piston has an air channel connecting the control chamber C and the air inlet, an air channel connecting the output chamber D and the upper end of pressure adjust piston, and an air channel connecting the lower end and the pressure adjust chamber F; the side wall of valve has an air channel connecting the vacuum chamber E and the outlet channel of electromagnetic control valve, and an air channel connecting the air inlet channel electromagnetic control valve. The invention can automatically adjust the brake pressure, with high sensitivity, better working property and high stability.

Description

Technical field [0001] The invention provides a dual-pipeline electronically controlled trailer braking valve, which belongs to the technical field of automobile braking. Background technique [0002] As my country's expressway backbone network has been basically formed, large-tonnage, trucks, long-wheelbase semi-trailers, and trailers with obvious cost advantages per ton-kilometer are also increasing year by year. Due to the increase of the wheelbase of the above-mentioned vehicles, the brake pipeline is also correspondingly lengthened. For the long-wheelbase vehicles running at high speed, the reaction time lag of the air brake system and insufficient braking force are still the main problems. However, the existing double-pipeline trailer brake valve has a lag in the trailer braking time under heavy load, and the brake is soft. It cannot meet the braking force required by the long-wheelbase vehicle during point braking or semi-braking. The phenomenon of hitting the main v...

AI Technical Summary

Problems solved by technology

Due to the increase of the wheelbase of the above-mentioned vehicles, the brake pipeline is also correspondingly lengthened. For the long-wheelbase vehicles running at high speed, the reaction time lag of the air brake system and insufficient braking force are still the main problems.

However, the existing double-pipeline trailer brake valve has a lag in the trailer braking time under heavy load, and the brake is soft. It cannot meet the braking force required by the long-wheelbase vehicle during point braking or semi-braking. The phenomenon of hitting the main vehicle, resulting in poor braking effect, especially when the weather is bad and the road conditions are not good, traffic accidents are prone to occur

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