Pneumatic shift operating system of secondary box of gearbox

Abstract

The invention relates to a pneumatic shift operating system of a secondary box of a gearbox in the technical field of automotive engineering, which comprises an air cleaner, a pressure-reducing valve,The invention relates to a pneumatic shift operating system of a secondary box of a gearbox in the technical field of automotive engineering, which comprises an air cleaner, a pressure-reducing valve, a high-low shift control valve, a branch control valve, a branch switch, a back force-taking error proofing valve, a composite shift control cylinder and a force-taking device switch. In the system,a high-low shift control valve, a branch control valve, a branch switch, a back force-taking error proofing valve, a composite shift control cylinder and a force-taking device switch. In the system,the branch control valve in the prior system is moved to a control air passage from a main air passage, the back force-taking error proofing valve is increased in front of a low shift air inlet of thethe branch control valve in the prior system is moved to a control air passage from a main air passage, the back force-taking error proofing valve is increased in front of a low shift air inlet of the composite shift control cylinder, and the structures of the prior two control valves and the branch switch are redesigned. The system thoroughly solves the problem of incorrect operation during backcomposite shift control cylinder, and the structures of the prior two control valves and the branch switch are redesigned. The system thoroughly solves the problem of incorrect operation during backforce taking of vehicles, and simultaneously avoids the shift release problem of a synchronizer of the secondary box.force taking of vehicles, and simultaneously avoids the shift release problem of a synchronizer of the secondary box.

Description

technical field [0001] The invention relates to a device in the technical field of automobile engineering, in particular to a pneumatic shift control system for a transmission auxiliary case. Background technique [0002] At present, there are two main types of auxiliary box high and low gear shift air control systems used in the main and auxiliary box structure double countershaft heavy-duty vehicle transmissions produced at home and abroad: [0003] The first type of air control system is to directly switch the air path through manual control of the high and low gear control valves, and use high pressure air to push the composite gear to control the left and right movement of the cylinder piston, thereby realizing high and low gear shifting. Its disadvantage is that when the vehicle adopts the rear power take-off mode, the auxiliary transmission case is vulnerable to damage caused by the driver's misoperation. This is because the high-pressure air that pushes the compound...

AI Technical Summary

Problems solved by technology

Although this air control system solves the shortcomings of the first system, since there is no high-pressure air in the compound gear control cylinder after the transmission is shifted into gear, it cannot keep the piston in the high-grade or low-gear position under the thrust of the high-pressure air. on, thus making the transmission easy to disengage while the vehicle is running

[0005] Measures such as increasing the self-locking mechanism of the composite gear control cylinder and the self-locking mechanism of the auxiliary box synchronizer have also been adopted in the prior art to make up for the above-mentioned defects, which is effective to a certain extent, but it will complicate the transmission structure and increase manufacturing cost

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