HYDRAULIC DRIVING SYSTEM

摘要

There are provided: a check valve (cb1) for detecting pressure at the outlet side of a pressure compensator (VB1); a maximum load pressure detecting pipeline (SL1) for selecting a higher pressure out of a pressure detected by said check valve (cb1) and a load pressure of an actuator belonging to a hydraulic pump (P1), to thereby supply it as a signal pressure; a check valve (cb2) for detecting a pressure at the outlet side of a pressure compensator (VB2); a maximum load pressure detecting pipeline (SL2) being independent of said maximum load pressure detecting pipeline (SL1) for selecting a higher pressure out of a pressure detected by said check valve (cb2) and a load pressure of an actuator belonging to a second hydraulic pump (P2), to thereby supply it as a signal pressure; and a path (300) for merging the pressure oils from the first and second hydraulic pumps (P1 and P2), which have flowed out of variable throttles (RB1 and RB2), to thereby supply it to an actuator (B). With this arrangement, said two hydraulic pumps (P1 and P2) can have independence of each secured.