| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic circuit of a turning working vehicle which reduces energy loss while preventing the reduction of working efficiency and can easily be applied to an existing turning working vehicle.SOLUTION: The hydraulic circuit 201 of the turning working vehicle 1 which has a load sensing system, includes a turning motor 7 which is driven by a hydraulic fluid supplied from a second hydraulic pump 22 and revolves a vehicle body (turning device 3) of the turning working vehicle 1, a pressure sensor 173 which detects a load pressure of the turning motor 7, a solenoid proportional pressure reducing valve 176a for turning motors which reduces a pilot pressure given to a directional control valve 63 for turning motors corresponding to the turning motor 7, and a controller 171 which reduces the pilot pressure given to the directional control valve 63 for turning motors by the solenoid proportional pressure reducing valve 176a for turning motors based on the load pressure detected by pressure sensor 173 and which limits the flow rate of the hydraulic fluid supplied to the turning motor 7 through the directional control valve 63 for turning motors. |
