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近年来,先进的液压传动与控制技术相继应用到工程机械上,如先导式控制系统、液压气动激振系统、全液压转向伺服系统、总功率变量系统、恒功率变量系统、双泵分合流系统等。采用这些高精度、高性能的液压系统可以大大提高工程机械的综合性能。但是,这些系统的液压元件(如斜盘式轴向柱塞泵、伺服滑阀等)运动副配合面间隙公差已经提高到1～5μm的精度,使这些元件对工作油液的污染变得十分敏感,从而使整机液压系统对工作油液的抗污染能力提出了十分苛刻的要求。为此,必须认真分析研究液压系统的污染控制,在提高液压系统操作性能的同
In recent years, advanced hydraulic transmission and control technology have been applied to construction machinery, such as the pilot control system, hydraulic pneumatic excitation system, hydraulic steering servo system, the total power variable system, constant power variable system, dual pump system Wait. The use of these high-precision, high-performance hydraulic system can greatly improve the overall performance of construction machinery. However, the tolerances of the clearances on the mating faces of the hydraulic components of these systems (such as swash plate axial piston pumps, servo slide valves, etc.) have been raised to the accuracy of 1 to 5 μm, resulting in a very high level of contamination of the working fluid by these components Sensitive, so that the whole hydraulic system of working fluid anti-pollution capacity made a very demanding requirements. To this end, we must carefully analyze the pollution control of hydraulic systems, hydraulic systems to improve performance in the same