The application involves a control device that aims to improve the fuel consumption in an operation of a crane. A control device of a hydraulic winch includes an engine (110), a hydraulic pump (131, 132), a hydraulic motor (135) which drives a winch drum, a winch manipulating member (213), an engine control unit (150, 110a) which controls a rotation speed of the engine, a winch load detector (154) which detects a load applied to the winch drum, and a motor capacity control unit (120) which controls a motor capacity of the hydraulic motor so as to decrease a motor capacity of the hydraulic motor in a fuel-saving operation mode to a motor capacity (Qm3) which is smaller than a motor capacity of the hydraulic motor in a normal operation mode. The engine control unit sets an upper limit value of the rotation speed of the engine in the fuel-saving operation mode to a value (N1 to N4) which is lower than a maximum rotation speed (Nmax) of the engine in the normal operation mode and corresponds to the load detected by the winch load detector.
CONTROL DEVICE OF HYDRAULIC WINCH
STEUERUNGSVORRICHTUNG EINER HYDRAULISCHEN WINDE
DISPOSITIF DE COMMANDE DE TREUIL HYDRAULIQUE
2023-12-20
Patent
Electronic Resource
English
IPC: | B66D Haspeln , CAPSTANS |
Winch control valve group and winch control hydraulic system
European Patent Office | 2024
|