Patent ID: 7958907
Filing Date: 2011-06-14
Classification: E02F,F15B,Y10T

Abstract:
1. A fluid pressure circuit comprising: a control valve incorporated with a plurality of first-group spools fed with hydraulic fluid from a first pump and a plurality of second-group spools fed with hydraulic fluid from a second pump, wherein the control valve feeds the hydraulic fluid to one specific actuator through a first-group specific spool and a second-group specific spool, wherein the control valve feeds the hydraulic fluid to a first actuator through another first-group spool, and wherein the control valve feeds the hydraulic fluid to a second actuator through another second-group spool; a pilot valve that pilot-operates each spool of the control valve via a pilot line; a first detector that detects operation of another first-group spool of the control valve; a second detector that detects operation of another second-group spool of the control valve; and a solenoid selector valve unit that switches a pilot line of the specific second-group spool from an interrupting state to a communicating state at a time of detection of a spool operation by the first detector and switches a pilot line of the specific first-group spool from an interrupting state to a communicating state at a time of detection of a spool operation by the second detector, wherein the solenoid selector valve unit is provided with four solenoid selector valves corresponding to two pilot lines connected to both ends of the specific first-group spool fed with hydraulic fluid from the first pump and two pilot lines connected to both ends of the specific second-group spool fed with hydraulic fluid from the second pump, respectively.