OIL PRESSURE CONTROLLER FOR CONSTRUCTION MACHINE,申请号JP19930270630-传众专利搜索

OIL PRESSURE CONTROLLER FOR CONSTRUCTION MACHINE

申请公布号：JPH07119704(A)

申请号：JP19930270630

申请日期：1993.10.28

申请公布日期：1995.05.09

申请人：

HITACHI CONSTR MACH CO LTD

发明人：NAGASHIMA YUJI;SUNAMURA KAZUHIRO;TATSUMI AKIRA

分类号：E02F9/22;F02B63/06;F04B49/00;F15B11/00

主分类号：E02F9/22

摘要：PURPOSE:To provide such an oil pressure controller for a construction machine that can prevent any danger caused by unexpected movement of a hydraulic actuator during its operation. CONSTITUTION:When automatic control is indicated by a selection switch 27, and if a load becomes larger so that a detection value of a loading pressure detection sensor 19 becomes larger than the prescribed pressure, a rotational speed increasing/decreasing device 25 is operated to increase rotational speed of an engine 11 larger than the rotational speed set by a rotational speed controller 23 and to increase the discharge of an oil pressure pump 13 so as to automatically comply with increase in the load. Then, an indication lamp 33 is lighted so as to inform increase in engine rotational speed to an operator in an automatic control mode in order to call the operator's attention. Indication by the indication lamp 33 can be made when the automatic control is selected by a selection switch 27.