ELECTRO-HYDRAULIC DRIVE SYSTEM FOR A WORK MACHINE

摘要

Disclosed is an electro-hydraulic drive system for a work machine, allowing efficient operation by means of oil pressure and electricity. Said drive system, which adjusts the flow rate of a hydraulic fluid by means of a control valve (6) and drives an upper rotating body (16), comprises: an electro-hydraulic pump (3) that has a hydraulic pump (4), which is driven by an engine (2), and a first electric motor (5); and an electro-hydraulic motor (9) that has a hydraulic motor (10), which is rotated by a hydraulic fluid supplied by the electro-hydraulic pump (3), and a second electric motor (11). The disclosed drive system is provided with a control device (7) that determines the operating states of the first electric motor (5) and second electric motor (11) from the load on the electro-hydraulic pump (3) and the load on the electro-hydraulic motor (9).