HYDRAULIC CONTROLLER
PROBLEM TO BE SOLVED: To control turning acceleration by properly controlling turning and driving pressure in the case of turning and starting of turning/boom-rising in a hydraulic controller of a construction machinery, and to promote controllability of the turning/boom-rising. SOLUTION: A hydrauli...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To control turning acceleration by properly controlling turning and driving pressure in the case of turning and starting of turning/boom-rising in a hydraulic controller of a construction machinery, and to promote controllability of the turning/boom-rising. SOLUTION: A hydraulic circuit 101 of a turning motor 24 is constituted of a circuit different from a hydraulic circuit 100 of a boom cylinder 16. A variable relief valve 33 is provided to an oil line for connecting a hydraulic pump 20 of the hydraulic circuit 101 to a directional control control valve 27, and relief pressure of the variable relief valve 33 is so controlled that it is lowered with the increase of pilot pressure for the boom-rising by a pressure sensor 37, a controller 28 and an electromagnetic proportional regulator 29. |
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