The present invention relates to a hydraulic system for construction machinery, which is applied to construction machinery provided with a steering unit (20) for controlling steering of equipment, and a main control valve (30) for controlling operating of a work tool, and includes: a main pump (10) for discharging working fluid supplied to the steering unit (20) and the main control valve (30); a load sensing pressure sensor (60) for sensing a load sensing pressure of the steering unit (20); a priority valve (22) installed in a supply passage for the working fluid discharged from the main pump (10), for dividing and supplying the working fluid discharged from the main pump (10) to the steering unit (20) and the main control valve (30), to correspond to the load sensing pressure; an auxiliary pump (40) for supplementing working fluid to the supply passage supplying the working fluid divided by the priority valve (22) to the steering unit (20); an electric motor (50) for operating the auxiliary pump (40); and a controller (80) for operating the electric motor (50) when the load sensing pressure is greater than a reference load sensing pressure, and additionally supplying working fluid discharged from the auxiliary pump (40) to the steering unit (20).


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    Titel :

    HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY


    Weitere Titelangaben:

    HYDRAULISCHES SYSTEM FÜR EINE BAUMASCHINE
    SYSTÈME HYDRAULIQUE POUR DES MACHINES DE CONSTRUCTION


    Beteiligte:
    KIM JEUNG HWA (Autor:in)

    Erscheinungsdatum :

    21.06.2017


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    G05D SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES , Systeme zum Steuern oder Regeln nichtelektrischer veränderlicher Größen / E02F Baggern , DREDGING / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B62D MOTOR VEHICLES , Motorfahrzeuge



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