Hydraulic drive system

A hydraulic oil flow path has a first flow path and a second flow path. The first flow path connects a first pump port and a first chamber of a hydraulic cylinder. The second flow path connects a second pump port and a second chamber of the hydraulic cylinder. The hydraulic oil flow path configures...

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Bibliographische Detailangaben
Hauptverfasser:	SASANO KENJI, SAITO KOJI, AKIYAMA TERUO, WATANABE TAKAYUKI, IIDA NOBORU
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DREDGING FIXED CONSTRUCTIONS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS FOUNDATIONS HEATING HYDRAULIC ENGINEERING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SOIL SHIFTING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A hydraulic oil flow path has a first flow path and a second flow path. The first flow path connects a first pump port and a first chamber of a hydraulic cylinder. The second flow path connects a second pump port and a second chamber of the hydraulic cylinder. The hydraulic oil flow path configures a closed circuit between a hydraulic pump and the hydraulic cylinder. A bleed-off flow path is a flow path for bleeding off some of the hydraulic oil from the second flow path. When the amount that an operation member for lowering a work machine is operated is smaller than a prescribed operation amount, a control valve connects the second flow path to the bleed-off flow path, via an aperture, such that the hydraulic pressure of the second flow path is suppressed to a pressure lower than the relief pressure. The prescribed operation amount is no greater than the maximum operation amount for the operation member for lowering the work machine.