The invention provides an anti-reverse-dragging hydraulic system and a highway-railway dual-purpose vehicle, and relates to the technical field of hydraulic control systems.Under the vehicle downhill working condition, wheels drive a walking motor to move actively, a low-pressure cavity in a first oil port and a second oil port is changed into a high-pressure cavity, the high-pressure cavity is changed into a low-pressure cavity, and a walking pump generates the reverse-dragging braking effect; reverse dragging braking is achieved through the reverse dragging control safety valve set and the reverse dragging pressure control valve set. When the pressure of the high-pressure cavity of the walking motor is higher than the pressure of the sequence valve of the reverse dragging pressure control valve set, the sequence valve is opened, the displacement of the walking pump is changed, and reverse dragging braking is achieved. If the pressure of a high-pressure cavity of the walking motor exceeds the reverse dragging torque which can be borne by the engine, the reverse dragging pump bears a certain reverse dragging torque, and meanwhile, when the pressure of the high-pressure cavity of the walking motor is higher than the safety pressure of a back pressure valve of the reverse dragging control safety valve group, the reverse dragging control safety valve group releases pressure to protect the closed system; and reverse dragging braking is prevented from exceeding the bearing range of the engine, and the safety of the whole closed system is ensured.

    本发明提供一种防反拖液压系统及公铁两用车辆,涉及液压控制系统技术领域,在车辆下坡工况,车轮驱动走行马达主动运动,第一油口和第二油口当中的低压腔变成高压腔、高压腔变成低压腔,由走行泵产生反拖制动效果;通过反拖控制安全阀组、反拖压力控制阀组实现反拖制动;当走行马达的高压腔压力高于反拖压力控制阀组的顺序阀压力时,顺序阀打开,改变走行泵的排量,实现反拖制动;若走行马达的高压腔压力超过发动机能承受的反拖力矩时,反拖泵承担一定的反拖力矩,同时当走行马达的高压腔压力高于反拖控制安全阀组背压阀的安全压力时,反拖控制安全阀组泄压保护闭式系统,避免反拖制动超出发动机的承受范围,确保整个闭式系统的安全。


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    Title :

    Anti-reverse-dragging hydraulic system and highway-railway dual-purpose vehicle


    Additional title:

    一种防反拖液压系统及公铁两用车辆


    Contributors:
    LIU HAIYE (author) / SHI TIANLIANG (author) / WANG HONG (author) / LIU YE (author) / YANG CANDING (author) / REN YAN (author) / LI MEIXIANG (author) / DING MAOQING (author) / ZHANG JINTING (author) / WEN YANZHONG (author)

    Publication date :

    2023-12-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B60F VEHICLES FOR USE BOTH ON RAIL AND ON ROAD , Fahrzeuge für den Verkehr sowohl auf Schienen als auch auf Straßen / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES



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