HYDRAULIC SYSTEM FOR STEERING CONSTRUCTION MACHINERY

摘要

The present invention relates to a hydraulic system for steering a construction machine for steering a construction machine, comprising: a steering pump (21) for supplying operating fluid to a steering device (20) via a hydraulic line (23) for a steering pump; An auxiliary pump 11 for supplying operating fluid to the auxiliary device 10 through the hydraulic line 13 for the auxiliary pump; And the pressure receiving portions on both sides of the hydraulic pump are connected to the hydraulic pressure line for the auxiliary pump so that the load sensing pressure LS of the steering device 20 and the pressure P of the hydraulic fluid discharged from the steering pump 21 And when the load sensing pressure LS of the steering device 20 is greater than the pressure difference P of the operating oil discharged from the steering pump 21 by a predetermined differential pressure or more, And an auxiliary device control valve (12) for controlling all or a part of the hydraulic fluid to be joined to the hydraulic line (23) for the steering device (20) via the first merging hydraulic line (14).;Steering, fan motor pump, steering, joining