A transmission high reverse lock system

Abstract

The invention provides a transmission high reverse lock system which is characterized in that an auxiliary box is not out of gear during pre-selection and the high reverse lock is unlikely to fail when a main box is put into a gear. The transmission high reverse lock system comprises a single H handle valve, a pre-exhaust gas circuit control valve, a main box transverse gear shifting rod, a one-way valve, a single H valve, an auxiliary box cylinder, a high reverse lock and a first-gear reverse shifting fork; the gas inlet of the single H handle valve and the gas inlet of the pre-exhaust gas circuit control valve are connected to the total gas inlet end of the system; the gas transmission opening of the single H handle valve is connected with the control end of the single H valve; the gas transmission opening of the pre-exhaust gas circuit control valve is connected with the gas inlet of the one-way valve; the gas transmission opening of the one-way valve is connected with the gas inlet of the single H valve; the first gas transmission opening of the single H valve is connected with a rod low-gear region in the auxiliary box cylinder, while the second gas transmission opening of the single H valve is connected with a high gear region of the auxiliary box cylinder and also connected with the high reverse lock simultaneously; when the main box is put into a gear, the main box transverse gear shifting rod is in transmission connection with the control end of the pre-exhaust gas circuit control valve; when gas in fed into the high reverse lock, the high reverse lock is connected and locked with the first-gear reverse shifting fork.

Description

technical field [0001] The invention relates to the field of gear position locking of a transmission, in particular to a high-grade reverse lock system of a transmission. Background technique [0002] For a transmission with a single H control structure and a rear auxiliary box, it must be ensured that the reverse gear wheel cannot participate in the transmission when the rear auxiliary box of the transmission is shifted to high gear, so as to avoid accidents caused by the wrong reverse gear being engaged when the vehicle is moving forward. In order to solve this problem, a high reverse gear lock mechanism is added above the first gear and reverse gear fork. When the auxiliary box is hung in the high-grade area, the high reverse gear lock works to lock the first gear and reverse gear fork, and the fork is prohibited Sport first and reverse gears. [0003] At present, the operation of the transmission with auxiliary box requires pre-selection, that is, firstly toggle the sin...

AI Technical Summary

Problems solved by technology

[0004] The use of an air control valve with pre-exhaust can solve the problem of pre-selection and disengagement, but it brings another problem, that is, once the main box is in gear, the air control valve exhausts, resulting in high and low gears after the single H valve The side air is completely emptied, causing the high reverse gear lock to fail

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