To provide a hydraulic circuit of a work machine capable of improving operability of an actuator.SOLUTION: A hydraulic circuit of a work machine has: a remote control valve 4 that is provided in a first pilot oil passage 11, and changes a first pilot pressure, which is a pressure of oil flowing through the first pilot oil passage 11, according to an operation amount of an operation lever 3; a pressure sensor 5 that is provided in the first pilot oil passage 11, and detects the first pilot pressure on the downstream side of the remote control valve 4; a proportional valve 6 that is provided in a second pilot oil passage 12, and changes a second pilot pressure, which is a pressure of oil flowing through the second pilot oil passage 12; a control valve 9 that is provided in a hydraulic oil passage 13, and changes a flow rate and direction of the oil supplied to a motor 8 according to the second pilot pressure; and a controller 10 that controls the proportional valve 6 so as to set the second pilot pressure to the pressure according to the first pilot pressure detected by the pressure sensor 5.SELECTED DRAWING: Figure 2

    【課題】アクチュエータの操作性を向上させることが可能な作業機械の油圧回路を提供する。【解決手段】第1パイロット油路11に設けられ、第1パイロット油路11を流れる油の圧力である第1パイロット圧を操作レバー3の操作量に応じて変化させるリモコン弁4と、第1パイロット油路11に設けられ、リモコン弁4の下流側の第1パイロット圧を検出する圧力センサ5と、第2パイロット油路12に設けられ、第2パイロット油路12を流れる油の圧力である第2パイロット圧を変化させる比例弁6と、作動油路13に設けられ、モータ8へ供給される油の流量および方向を第2パイロット圧に応じて変化させるコントロールバルブ9と、圧力センサ5が検出した第1パイロット圧に応じた圧力に第2パイロット圧を設定するように、比例弁6を制御するコントローラ10と、を有する。【選択図】図2


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    Title :

    HYDRAULIC CIRCUIT OF WORK MACHINE


    Additional title:

    作業機械の油圧回路


    Contributors:

    Publication date :

    2020-08-31


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B66C Krane , CRANES



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