Normally-closed gas circuit control valve

Abstract

The invention provides a normally-closed gas circuit control valve. The normally-closed gas circuit control valve comprises a valve body, a first lining, an ejector rod, a valve element, a first spring, a second spring, a first sealing ring and a second sealing ring. The first lining is arranged at one end in the valve body, the ejector rod is arranged at the other end in the valve body, and a gasinlet hole, a gas outlet hole and a gas inlet channel are formed in the first lining. The valve element and the first spring are installed in the first lining in a matched mode, so that the first sealing ring on the valve element makes close contact with the inner wall of the first lining. When the valve is switched from the initial state to the final state, the ejector rod is firstly driven to move, and when the ejector rod makes close contact with the second sealing ring, an exhaust channel is closed, and the ejector rod continues to move till the ejector rod abuts against the valve elementand drives the valve element to move so as to open the gas inlet channel and close the exhaust channel. According to the normally-closed gas circuit control valve, the exhaust channel can be cut offbefore the gas inlet channel is opened, the control precision is high, and the problem that potential safety hazards are caused by low control precision of a valve body in the prior art is solved.

Description

technical field [0001] The invention relates to the field of manual transmission control, in particular to the air circuit control of commercial vehicle manual transmissions, in particular to a normally closed air circuit control valve. Background technique [0002] Manual transmission is a very important part of the vehicle, it can change the transmission ratio, expand the torque and speed of the drive wheel to adapt to changing driving conditions, and at the same time make the engine in a favorable (higher power and lower fuel consumption) working condition down to work. The driver controls the transmission via a joystick, which allows switching between high and low gears. [0003] The commercial vehicle is provided with a main box gearbox and an auxiliary box gearbox. When the rear auxiliary box shifts gears, it is necessary to provide an air source to the shut-off valve of the main box to ensure that the main box is locked and protected during the auxiliary box shiftin...

AI Technical Summary

Problems solved by technology

However, the gas circuit control valve in the related art has low control accuracy during the gear shifting process and cannot meet the requirements of the actual application environment. Therefore, it will cause some uncertain safety hazards during the driving process.

[0004] Aiming at the problem of low control accuracy of the gas path control valve in the related art during the gear shifting process, no effective solution has been proposed so far

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