A dual-piston differential valve assembly

Abstract

The invention proposes a dual-piston differential valve assembly, comprising an upper valve body and a lower valve body, the upper valve body is connected with the lower valve body, and the upper valve body and the lower valve body are connected to form a first cavity, The upper part of the upper valve body is provided with the relay valve port 41 and the manual valve port 42, the lower valve body is provided with the inlet port 1 and the output port 2, and the outlet channels of the 41 port and the 42 port both extend to the first cavity. The first cavity is provided with a piston. The invention transforms the piston so that after the installation is completed, the first cavity is divided into three parts, which are the upper cavity pressure-bearing area, the non-pressure-bearing area and the lower cavity. , and the ratio of the area of ​​the pressure-bearing area of ​​the upper chamber to the area of ​​the lower chamber is 0.8~0.83:1, so that the maximum output pressure of the differential valve cannot exceed 8~8.3 when the car is not braking or when the vehicle is fully braked. bar, which can effectively avoid the safety hazard caused by the failure of the spring brake air chamber in the prior art to the driving of the whole vehicle.

Description

technical field [0001] The invention belongs to the technical field of automobile brake systems, in particular to a double-piston differential valve assembly. Background technique [0002] The differential valve is the control element for the intake and exhaust of the spring chamber of the spring brake chamber. [0003] When the car is running, it is necessary to completely release the spring brake of the air chamber, and the air pressure input to the spring chamber of the air chamber should generally not be lower than 6.5bar. It is true that the air pressure is low and the spring brake cannot be completely released, but the air pressure is too high, which will cause the spring cavity of the air chamber to be overloaded, resulting in deformation of the air chamber and air leakage, or even damage to the air chamber. Therefore, the maximum output air pressure of the differential valve cannot exceed the safety air pressure of the spring brake chamber by 8~8.3bar. [0004] The...

AI Technical Summary

Problems solved by technology

When the vehicle manufacturer requests to cancel the setting of the pressure limiting valve of the parking air tank, the above conventional differential valve will exist. No matter what state the car is in, P2≈10bar, the output air pressure P2 obviously exceeds the pressure of the spring brake chamber. The safety air pressure is 8~8.3bar, so there is a risk of failure of the air chamber, and there are certain hidden dangers in driving safety

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