Air return valve for inner air return independent discharge spring braking air chamber

Abstract

The invention relates to the technical field of automobile parts, in particular to an air return valve for an inner air return independent discharge spring braking air chamber to solve the problem that external harmful substance enters and damages a cylinder body, so the service life of an energy storage cavity is threatened seriously. The air return valve is characterized in that through holes are formed in a valve seat in an axial direction; hole steps are arranged in the through holes; valve ports are formed at the hole steps; axial air holes are formed between the valve ports and a cylinder wall of the valve seat in the axial direction; the end of the cylinder wall of the valve seat is provided with radial air holes which are vertical to the axial air holes; a valve bush and a valve are arranged in a large-diameter through hole, facing the hole steps, in the valve seat; one end of the valve is adhered to the valve ports, and the other end of the valve is in fit with inner holes formed in the valve bush in the axial direction; valve springs are arranged in the valve; a valve plug is arranged at the end of a small-diameter through, facing the hole steps, in the valve seat; and one end, facing the valve, of the valve plug is provided with a flow guide hole. A piston assembly end cover is saved, the inner space is fully utilized, the air return valve is sealed reliably and a sealing component is not damaged.

Description

technical field [0001] The invention relates to the technical field of automobile parts, in particular to an air return valve of an internal return air independent discharge type spring brake air chamber in an automobile brake system. Background technique [0002] The application of spring brake air chambers on all kinds of medium and heavy load vehicles not only ensures the safety of vehicle driving and braking, but also improves the stability of vehicle parking and the reliability of emergency braking. [0003] When the normal driving vehicle needs to decelerate or stop, under the action of the brake control valve, the compressed air of the system enters the service brake chamber from the service brake air inlet, pushes the thrust plate to move forward, and the brake converts the air pressure into the service brake chamber. Mechanical energy that enables a vehicle to slow down or stop. At the same time, the volume of the normal pressure chamber of the service brake is con...

AI Technical Summary

Problems solved by technology

[0005] People have also designed an improvement of an internal breathing spring brake air chamber such as the patent notification number CN2846243Y, which is mainly characterized in that the piston rod in the rear air chamber casing penetrates the diaphragm type piston and is connected with the push plate to form a piston assembly. , the edge of the diaphragm piston is pressed and sealed by the rear air chamber shell and the middle shell when they are connected. The shell wall of the rear air chamber shell is closed. The air passage of the air passage communicates with the ventilation chamber, the ventilation chamber communicates with the breathing port, and the pressure storage chamber communicates with the air port. This device is provided with a one-way valve at the end of the piston rod. O-rings are used to achieve air intake and exhaust, there must be supplementary sealing

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