摘要 |
PROBLEM TO BE SOLVED: To recover energy from a hydraulic actuator, and thereafter utilize the recovered energy for driving the hydraulic actuator, in a hydraulic system controlling a flow rate to a hydraulic actuator moving a component on a machine. SOLUTION: The hydraulic system has a valve assembly with two workports coupled to chambers of first and second cylinders which are connected mechanically in parallel to a machine component. A separation control valve is connected between first chambers of the two cylinders, and a shunt control valve is connected between the workports. A recovery control valve couples an accumulator to the first chamber of the second cylinder. Opening and closing the valves in different combinations routes fluid from one or both of the cylinders into the accumulator where the fluid is stored under pressure, and thereafter enables stored fluid to be used to power one or both of the cylinders. The shunt control valve is used to route fluid discharged from one chamber of each cylinder to the other chambers of those cylinders. Thus the hydraulic system recovers and reuses energy in various manners. COPYRIGHT: (C)2009,JPO&INPIT |