HYDRAULIC SYSTEM OF CONSTRUCTION MACHINE

• Main Authors: CHOI, DAE GYUN, PARK, HYUNG JUN, KIM, KI YOUNG, KIM, KI YONG
• Format: Patent
• Language: English; Korean
• Published: 15.07.2015
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLETECHNOLOGY; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; SOIL SHIFTING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

According to an embodiment of the present invention, a hydraulic system of a construction machine comprises: a swing pump where a hydraulic fluid is discharged in both directions; a control chamber controlling a discharge rate of the swing pump; a swing motor receiving the hydraulic fluid of the swing pump to swing; an operation device generating a plurality of operation signals to enable a front of a construction machine to be operated; a control device converting pilot pressure generated by the operation signal of the operation device into a current value to be outputted; and an electronic proportional pressure reducing valve outputting the valve pressure corresponding to the current value applied from the control device. The electronic proportional pressure reducing valve controls the relief pressure of the pressure of the swing pilot inputted to the control chamber. 본 발명의 실시예는 건설기계의 유압시스템에 관한 것으로, 양방향으로 작동유가 토출되는 선회 펌프와, 상기 선회 펌프의 토출유량을 제어하는 컨트롤 챔버와, 상기 선회 펌프의 작동유를 제공받아 선회 동작하는 선회 모터와, 건설기계의 프론트의 동작을 위한 복수의 조작신호를 발생시키는 조작장치와, 상기 조작장치의 조작신호에 의해 발생된 파일럿 압력을 전류값으로 변환하여 출력하는 제어장치 및 상기 제어장치로부터 인가되는 전류값에 대응되는 밸브 압력을 출력하는 전자비례감압밸브를 포함하고, 상기 전자비례감암밸브는 상기 컨트롤 챔버에 입력되는 선회 파일럿 압력의 릴리프 압을 제어한다.