| 摘要 |
PROBLEM TO BE SOLVED: To provide a load sensing hydraulic control device capable of easily and surely reducing shock during starting and having excellent responsiveness. SOLUTION: In this load sensing hydraulic control device, when a pressure in a signal line SL5 rises, it is introduced into a back chamber 68A through a restrictor 60C. A gently boosting relief valve 60 is first operated at the position where a piston PS abuts on the shoulder part 66, i.e., in a relatively low pressure state of a spring 62. Since the spring is compressed as a pressure oil is introduced into the back chamber 68A, the relief pressure is also increased and finally a final set pressure is determined at the position where the lower end 64A of the piston abuts on the seat 64 of a valve element wall part. In this case, the shock during the starting is reduced and boosting characteristics without response delay can be determined by adjusting the initial set pressure, the final reset pressure, and the restriction effect of the restrictor 60C. COPYRIGHT: (C)2008,JPO&INPIT
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