| 摘要 |
PROBLEM TO BE SOLVED: To secure reliability of a hydraulic device by suppressing foaming of a working fluid while preventing increase in size of the hydraulic device including a single rod cylinder.SOLUTION: In a hydraulic cylinder (30) of a hydraulic device (20), a rod-side liquid chamber (34) is connected to a first pump mechanism (40), and a head-side liquid chamber (35) is connected to the first pump mechanism (40) and a second pump mechanism (45). A tank (51) is connected to the second pump mechanism (45). A valve mechanism (52) disposed between the hydraulic cylinder (30) and the first pump mechanism (40) is switched between a one-way circulation state of allowing only inflow of the working fluid to the rod-side liquid chamber (34), and an outflow allowing state of allowing outflow of the working fluid from the rod-side liquid chamber (34).SELECTED DRAWING: Figure 1 |
