HYDRAULIC DRIVE UNIT

PROBLEM TO BE SOLVED: To provide a hydraulic drive unit capable of reducing loads to drive body driven by hydraulic cylinders in compound operation capable of realizing increase of speed of either hydraulic cylinder. SOLUTION: This device, provided on a hydraulic shovel, is provided with a main hydr...

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Bibliographic Details
Main Author KAJITA YUSUKE
Format Patent
LanguageEnglish
Published 03.06.2004
Edition7
Subjects
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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Summary:PROBLEM TO BE SOLVED: To provide a hydraulic drive unit capable of reducing loads to drive body driven by hydraulic cylinders in compound operation capable of realizing increase of speed of either hydraulic cylinder. SOLUTION: This device, provided on a hydraulic shovel, is provided with a main hydraulic pump 21, a boom cylinder 6, an arm cylinder 7, and a communication control means including a selector valve 64, a check valve 41, and a communication passage 40 to communicate a rod side chamber 6b of the boom cylinder 6 with a bottom side chamber 7a of the arm cylinder 7 to supply hydraulic oil from the rod side chamber 6b to the bottom side chamber 7a when drive pressure of the arm cylinder 7 exceeds a prescribed pressure. It is also provided with a pressure setting means provided with a main relief valve 80 and an overload relief valve 84 related to the boom cylinder 6 for setting drive pressure of the arm cylinder 7 to be lower than relief pressure of the overload relief valve 84 when the boom cylinder 6 is communicated with the arm cylinder 7. COPYRIGHT: (C)2004,JPO
Bibliography:Application Number: JP20020322673