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유압 피스톤 펌프의 전자제어를 위한 EPPR 밸브의 해석모델 개발 및 특성 분석
이근호(G. H. Lee),함영복(Y. B. Ham),윤소남(S. N. Yoon),김홍욱(H. U. Kim),하룬 아흐마드 칸(H. A. Khan),김용길(Y. K. Kim),김당주(D. J. Kim),손호연(H. Y. Son),김수태(S. T. Kim) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.6
This paper is a study to apply EPPR valve for the electronic control of variable displacement hydraulic piston pump. In order to adjust the displacement of the pump, a regulator capable of controlling the swash plate angle is required. I apply the EPPR valve which is a valve that controls the output pressure by proportional current. It can be applied to control the swash plate angle with the advantage of excellent response, competitive price and electronic control. So this study deals with the development of analytical model and analysis of characteristics of EPPR valve by using SimulationX.
스퀴즈 효과를 고려한 사판식 피스톤 펌프 홀더의 부하특성에 대한 연구
주경진(G. J. Ju),김수태(S. T. Kim),김용길(Y. K. Kim) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.6
The load characteristics of the piston pump holder due to the squeeze effect are influenced by the surface shape and the gap thickness of holder. Therefore, the pressure distribution and the load capacity of piston pump holder due to the squeeze effect are studied using CFD software and the surface shape and the gap thickness of piston pump holder are considered. In order to verify the accuracy of the numerical analysis results, a circular plate holder is numerically analyzed and the accuracy of the numerical results is verified by comparing with the theoretical results. Numerical analysis on the load characteristics of a rectangular plate holder for the piston pump are performed by applying the results of circular plate holder. And the pressure distribution and load capacity of the rectangular plate holder are obtained. The results show that both maximum pressure and load capacity of the square plate holder without grooves are highest and the effects of the number and arrangement of grooves on the load capacity of holder are weak. We are concluded that the load capacity and the maximum pressure are slightly affected due to the existence of grooves on the holder surface and the fluid storaging effect of holder surface grooves during operation is possible to prevent the dry-sticking phenomenon.