| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce engine load when an engine starts to realize speedy engine start operation accompanying with it while preventing a structure of the whole hydraulic driving device from becoming complicated and preventing increase of size of the whole device. <P>SOLUTION: This hydraulic driving device is provided with a control pressure supply means for giving pressure oil of a pilot pump 3 driven by the engine 1 to a control chamber 6b of an LS control valve 6 as control pressure for driving the LS control valve 6 so as to reduce an inclination rotation angle of a main pump 2 driven by the engine 1. The control pressure supply means includes a pilot pipe passage 21 capable of connecting the control chamber 6b of the LS control valve 6 with the pilot pump 3, a solenoid valve 22 provided in the pilot pipe passage 21 and having a change-over position 22b for supplying pressure oil of the pilot pump 3 into the control chamber 6b of the LS control valve 6, a battery 23 connected with the solenoid valve 22, and a switch 24 for connecting the solenoid valve 22 and the battery 23 mutually and disconnecting them from each other. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
