HYDRAULIC CONTROL SYSTEM OF CONSTRUCTION MACHINERY

摘要

The present invention relates to a hydraulic control system of a construction machinery. The present invention, as the hydraulic control system of the construction machinery, which supplies hydraulic oil to first and second traveling motors and a front working apparatus from first and second main hydraulic pumps to perform single-traveling and complex-traveling operations, includes a traveling straight spool. According to the traveling straight spool, when changing from the single-traveling operation to the complex-traveling operation, in a process of changing, the hydraulic oil in the first and second main hydraulic pumps is distributed and supplied to the first and second traveling motors without going to the front working apparatus. In addition, in a changed state after a certain time, the hydraulic oil in any one main hydraulic pump is distributed and supplied to the first and second traveling motors, and the hydraulic oil in the other main hydraulic pump is supplied to the front working apparatus.;COPYRIGHT KIPO 2020