一、引言在研究和分析液压泵、液压马达性能时,无论容积效率或机械效率均是重要的评价指标。而确定这些效率的前提,则是确定泵、马达的理论排量。所谓理论排量,就是指泵和马达在没有任何损失的情况下每转排出液体的体积。在泵和马达运行时测量其理论排量,不可避免地产生容积损失和其它损失,如液体压缩损失、余隙容积损失、泄漏损失等,因此要得 I. INTRODUCTION In studying and analyzing the performance of hydraulic pump and hydraulic motor, both volumetric efficiency and mechanical efficiency are important evaluation indexes. The premise to determine these efficiency, it is to determine the pump, motor displacement. The so-called theoretical displacement, refers to the pump and motor in the absence of any loss of liquid each discharge volume. Measuring the displacement of a pump and a motor during its operation will inevitably lead to volume loss and other losses such as liquid compression loss, clearance volume loss, leakage loss, etc. Therefore,