The invention belongs to the technical field of hydraulic transmission gearbox control, and particularly relates to a proportional hydraulic control system of a hydraulic transmission gearbox for a forklift. Comprising an oil supply pump, a main pressure regulating valve, an overflow valve, a hydraulic torque converter, a cooler, a gear shifting electromagnetic valve, an inching valve, a gear control direction valve, a forward gear proportional valve, a backward gear proportional valve, a forward I-gear clutch, a forward II-gear clutch, a backward I-gear clutch and a backward II-gear clutch. The gear shifting electromagnetic valve adjusts the working position of the gear control direction valve, and the opening degree of the forward gear proportional valve and the opening degree of the backward gear proportional valve are adjusted, so that the proportional hydraulic control system achieves adjustment of a neutral gear, a first forward gear, a second forward gear, a first backward gear and a second backward gear of a vehicle. Meanwhile, the working position of the inching valve is adjusted through the inching pedal, so that the inching operation of the vehicle is realized; therefore, smooth control over gear combination and reversing of the four clutches can be achieved only through two proportional valves and one electromagnetic valve.

    本发明属于液力传动变速箱的控制技术领域,尤其涉及一种叉车用液力传动变速箱的比例液压控制系统。包括供油泵、主调压阀、溢流阀、液力变矩器、冷却器、换挡电磁阀、微动阀、挡位控制方向阀、前进挡比例阀、后退挡比例阀、前进Ⅰ挡离合器、前进Ⅱ挡离合器、后退Ⅰ挡离合器、后退Ⅱ挡离合器;换挡电磁阀调整挡位控制方向阀的工作位,前进挡比例阀和后退挡比例阀的开度调节,使得比例液压控制系统实现车辆的空挡、前进1挡、前进2挡、后退1挡、后退2挡调整;同时通过微动踏板调整所述微动阀的工作位,实现车辆的微动操作;因此本发明仅使用两个比例阀和一个电磁阀即可实现四个离合器挡位结合、换向的平顺控制。


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    Title :

    Proportional hydraulic control system of hydraulic transmission gearbox for forklift


    Additional title:

    一种叉车用液力传动变速箱的比例液压控制系统


    Contributors:
    ZHAO FEI (author) / MA NING (author) / ZHU JIANXIONG (author) / LIU HAILIN (author) / WU CHUANYANG (author) / CHANG FANGPO (author)

    Publication date :

    2023-08-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    F16H Getriebe , GEARING / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last



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