HYDRAULIC CONTROL UNIT OF HYDRAULIC EXCAVATORS

专利名称：HYDRAULIC CONTROL UNIT OF HYDRAULIC

EXCAVATORS

发明人：KAMIKAWA, Nobuhisa,NISHIDA, Kimio申请号：EP902300.6申请日：190213公开号：EP0372081B1公开日：19950823

摘要：A hydraulic control unit according to the present invention is an apparatusprovided in the hydraulic circuit of a hydraulic excavator. This apparatus is capable ofimproving the pressure and flow rate of a relief oil as necessary. A first invention relatesto parts provided in a hydraulic circuit of a hydraulic excavator having a power constantcontrol and a cutoff control, said parts including a variable relief valve (60A) wherepressure is boosted when a pilot signal (Pc7) is received, a change-over solenoid valve(80) used to supply and cut off the pilot signal (Pc7), a variable cutoff control valve (10A)adapted to receive a pilot signal (Pc6) and inactivate the cutoff control, a change-oversolenoid valve (70) used to supply and cut off the pilot signal (Pc6), and an electric circuit(X01) provided with a switch (90) for opening and closing the change-over solenoid valves(70, 80). A second invention relates to the same parts as mentioned above with a timeradded to the same electric circuit (X01) as that of the first invention.

申请人：KOMATSU MFG CO LTD

地址：JP

国籍：JP

代理机构：Meissner, Peter E., Dipl.-Ing.

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