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效率往往是就单个油泵或者油马达而言的。不过,就传动装置之类的复合机器或者整个油压装置来说,有时也使用“回路效率”的概念。对于单体泵和油马达,通常可以考虑如下三种效率。(1)全效率(或者称作总效率)(Totalefficicncy)η=动力输出/动力输入η_P(泵的全效率)=油压输出功率/机械输入功率η_M(马达的全效率)=机械输出功率/油压输入功率(2)容积效率(或者称作体积效率)(Volumetric efficiency)η_P=有效容积/理论容积
Efficiency is often a single pump or oil motor in terms of. However, the concept of “loop efficiency” is sometimes used in complex machines such as gearing or the entire hydraulic system. The following three types of efficiency are generally considered for monoblock pumps and oil motors. (1) Totalefficicncy η = Power Output / Power Input η_P (Pump Full Efficiency) = Hydraulic Output Power / Mechanical Input Power η_M (Total Motor Efficiency) = Mechanical Output Power / Hydraulic input power (2) Volumetric efficiency (or volumetric efficiency) η_P = Effective volume / theoretical volume