| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic system of a hydraulic working machine, capable of minimizing influences of degraded responsiveness of an actuator with respect to a speed control and maintaining good operability comparable to a spool type flow volume control valve. <P>SOLUTION: The system includes: a motor capacity control means, which decreases a capacity of a variable capacity motor 23 when the pressure detected by a pressure gauge 27 is larger than the pressure detected by a pressure gauge 28, increases the capacity of the variable capacity motor 23 when the pressure detected by the pressure gauge 27 is smaller than the pressure detected by the pressure gauge 28, and fixes the capacity of the variable capacity motor 23 when the pressure detected by the pressure gauge 27 is equal to the pressure detected by the pressure gauge 28; a power regenerative detour oil path 30 branched from a power regenerative oil path 22; and a recovery regulation control means including a controller 25 and a recovery regulation valve 31, for performing control to guide a part of a flow volume in the power regenerative oil path 22 to the power regenerative detour oil path 30 when the flow volume of the power regenerative oil path 22 is equal to or larger than a predetermined flow volume. <P>COPYRIGHT: (C)2013,JPO&INPIT |
