| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic driving device for a working machine, which surely prevents behavior of a single rod double acting cylinder not intended by an operator, when the discharge pressure of a main pump is raised to elevate exhaust gas temperature to a temperature required for burning particulate matter. <P>SOLUTION: The device hydraulic driving device for a working machine includes: a selector valve 160 interposed between a spool valve 61 and a rod chamber of a single rod double acting cylinder 51; and a means (a filter regeneration time actuation valve 122, a vehicle body controller 150 or the like) for controlling the selector valve 160. When a by-pass cut valve 110 is controlled to increase a load of an engine 21 to a degree where the exhaust gas temperature reaches a temperature required for burning particulate matter, the switch control means actuates the selector valve 160 and thereby prevents a flow of pressure oil directed from the rod chamber of the cylinder 51 toward the spool valve 61 by a poppet of the selector valve 160. <P>COPYRIGHT: (C)2013,JPO&INPIT |
