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液压机械的优点之一是功率密度大。关于功率密度,目前尚无严格的定义,一般是指单位重量的功率,亦可理解为最大输出功率与重量之比,也就是说,对于输出同样功率的机械,功率密度越大,重量就越轻。因此在建筑机械、车辆等移动机械中,液压传动一直保持其优越性,在机床、注塑成形机等类固定机械上,大多优先考虑控制性能,而不是功率密度,所以未能发挥液压传动的优越性。进一步提高功率密度的手段之一是高压化。
One of the advantages of hydraulic machinery is the high power density. There is no strict definition of power density. Generally, it refers to the power per unit weight. It can also be understood as the ratio of the maximum output power to the weight. That is to say, for a machine outputting the same power, the greater the power density, the heavier the weight light. Therefore, in construction machinery, vehicles and other mobile machinery, hydraulic transmission has maintained its superiority, in machine tools, injection molding machines and other types of fixed machinery, most of the priority control performance, rather than the power density, it failed to play a superior hydraulic drive Sex. One of the means to further increase the power density is high voltage.