| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce a pressure loss generated during mutually combined operations of a turning motor, a boom cylinder, an arm cylinder, and a bucket cylinder. <P>SOLUTION: This hydraulic drive mechanism for a hydraulic shovel comprises a turning direction control valve 4a for controlling the drive of the turning motor, a boom direction control valve 4c for controlling the drive of the boom cylinder, an arm direction control valve 4e for controlling the drive of the arm cylinder, and a bucket direction control valve 4f for controlling the drive of the bucket cylinder, all of which are connected to main hydraulic pumps. A plurality of the main hydraulic pumps are composed of four or more main hydraulic pumps 2a-2f. The four main hydraulic pumps 2b, 2d, 2e and 2f out of the main hydraulic pumps 2a-2f are provided for the turning direction control valve 4b, the boom direction control valve 4c, the arm direction control valve 4e, and the bucket direction control valve 4f in a one-to-one correspondable manner. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
