To provide a hydraulic controller, for such as construction machines, excellent in operability and coinciding with the feeling of an operator.
The hydraulic control comprises a variable displacement pump 1; a switch valve group A of a switch valve A-1 and a switch valve A-2 having a load sensing function; a switch valve group B containing a switch valve B-1 and other having no load sensing function.; and a pressure compensation flow rate means C (block C). The switch valve group A is connected to a first discharge line 18 from which a discharge line 17 of a variable displacement pump 1 is branched, the switch valve group B is connected to a second discharge line 19, from which the discharge line of the variable displacement pump 1 is branched, through a pressure compensation flow regulating means C (the block C), and a pass flow rate of the pressure compensation flow regulating means C (the block C)is regulated according to operation of a switch valve contained in the switch valve group B.
ARAYA TAKASHI
JP2000035006A | 2000-02-02 | |||
JPH0552204A | 1993-03-02 | |||
JPH0526204A | 1993-02-02 |
WO1993005301A1 | 1993-03-18 |
Next Patent: HYDRAULIC DRIVE CONTROLLING DEVICE