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).


    Access

    Download


    Export, share and cite



    Title :

    HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY


    Additional title:

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


    Contributors:

    Publication date :

    2017-06-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

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



    Hydraulic system for construction machinery

    KIM JEUNG HWA | European Patent Office | 2016

    Free access

    CONSTRUCTION-MACHINERY HYDRAULIC CIRCUIT

    AOKI SEIJI / TODE YOSHIYUKI / OHIRA MASAHIRO et al. | European Patent Office | 2020

    Free access

    CONSTRUCTION-MACHINERY HYDRAULIC CIRCUIT

    AOKI SEIJI / HIGASHIDE YOSHIYUKI / OHIRA MASAHIRO et al. | European Patent Office | 2021

    Free access

    Hydraulic brake system of construction machinery vehicle

    GUO HUA / PAN HONGDA | European Patent Office | 2021

    Free access

    HYDRAULIC PRESSURE CONTROL DEVICE FOR CONSTRUCTION MACHINERY

    European Patent Office | 2017

    Free access