HYDRAULIC SYSTEM FOR STEERING CONSTRUCTION MACHINERY

摘要

A hydraulic system for construction equipment steering is provided to improve the steering efficiency of construction equipment with a simple structure and minimum expenses by using a fan motor pump or a brake pump used for the existing system as an auxiliary pump. A hydraulic system for construction equipment steering comprises a steering pump(21) supplying working fluids to a steering system(20) by a hydraulic line(23) for a steering pump, an auxiliary pump(11) supplying working fluids to an auxiliary device(10) by a hydraulic line(13) for an auxiliary pump, and a control valve(12) for an auxiliary device controlling the whole or a portion of the working fluids discharged from the auxiliary pump to flow together in the hydraulic line for a steering device if the load sensing pressure of the steering device is larger than the pressure of working fluids discharged from the steering pump over the standard difference pressure by connecting two water pressure portions to be supplied with load sensing pressure(LS) of the steering device and pressure of working fluids discharged from the steering pump.