| 摘要 |
<p>#CMT# #/CMT# The method involves providing a hydraulic pump (2) i.e. gear pump, for supply of a hydraulic steering device (4) and a work hydraulic system (3) with pressurizing medium. A priority valve (10) is attached to a delivery side (6) of the pump for preferred supply of the steering device with the medium. A structural unit (20) is formed by the valve with the pump. Driving torque of an electric drive motor (30) is limited by limitation of electric current driving the drive motor for limiting and securing pressure prevailing in the delivery side of the pump between the valve and the pump. #CMT# : #/CMT# The drive motor is designed as an asynchronous engine i.e. three-phase alternating current asynchronous engine. An independent claim is also included for a hydraulic system for a mobile working machine. #CMT#USE : #/CMT# Method for operating a hydraulic system of a mobile working machine i.e. industrial truck. #CMT#ADVANTAGE : #/CMT# The method enables limiting driving torque of the electric drive motor by the limitation of electric current driving the drive motor for limiting and securing pressure prevailing in the delivery side of the pump between the valve and the pump, thus protecting the gear pump against pressure peaks and damages in a simple and cost-effective manner, and hence avoiding failure of the gear pump caused by pressure peaks at the delivery side, while constructing the hydraulic system at reduced complexity. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic hydraulic circuit diagram of a hydraulic system of a working machine that is designed as an industrial truck. 2 : Hydraulic pump 3 : Work hydraulic system 4 : Hydraulic steering device 6 : Delivery side 10 : Priority valve 20 : Structural unit 30 : Electric drive motor.</p> |
