HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY

PURPOSE:To improve safety and efficiency at execution of work by separating hydraulic actuators so that each can be operated by different two circuits supplied by two pumps, and by supplying pressure oil from the first pump to a motor for traveling and from the second pump to a motor for work-handli...

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Bibliographische Detailangaben
1. Verfasser:	KUBOMOTO WATARU
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:	PURPOSE:To improve safety and efficiency at execution of work by separating hydraulic actuators so that each can be operated by different two circuits supplied by two pumps, and by supplying pressure oil from the first pump to a motor for traveling and from the second pump to a motor for work-handling. CONSTITUTION:A hydraulic circuit of a hydraulic shovel is composed of passages comprising each of right and left valves 1R and 1L for traveling, each of right and left motors 8R and 8L for traveling and each of second and first pumps 26 and 25, and the passages are connected by each of bypass valves 47b and 47a. The circuit is further constructed in such that pressure oil from the first pump 25 and the second pump 26 can be supplied to a remote-control valve 9 for traveling and to a remote-control valve 17 for work-handling by operation of an independent valve 49 for traveling that is capable of being switched. When a switch 52 is operated, pressure oil from the pumps 25 and 26 are supplied independently to the remote-control valve 9 for traveling and to the remote-control valve 17 for work-handling. Thereby travel speed and work-handling speed will not vary even under simultaneous operation of traveling and work-handling.