HYDRAULIC DRIVE DEVICE OF HYDRAULIC OPERATING MACHINE

摘要

Provided is a hydraulic drive device of a hydraulic operating machine, wherein the discharge pressure can be reliably controlled at a predetermined value when the temperature of an exhaust gas is increased to a temperature necessary to burn particulate substances by increasing a load applied to an engine. A variable aperture (19) is controlled by a controller (14) and a control valve (20) for controlling a discharge pressure in a non-operation state of a hydraulic operating machine, to increase the discharge pressure of a variable displacement hydraulic pump (4), so that a load applied to an engine is increased to increase the temperature of an exhaust gas to a temperature necessary to burn particulate substances. In this respect, the controller (14) controls the control valve (20) for controlling a discharge pressure so that the discharge pressure detected by a discharge pressure sensor (21) matches with a predetermined basic discharge pressure. The basic discharge pressure is determined as a minimum pressure suitable for causing an exhaust gas to have a heat necessary to burn particulate substances.