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多年来,国内外相继发表了许多提高液压传动效率的论文。从目前进展情况来看,对液压元件的研究和提高,虽说仍有一些潜力可挖,但总的来看,已逐步趋向极限,因此,液压传动要在传动系统领域中继续占有一席领地,必须进一步提高经济效益。本文将对此进行初步探讨。一、液压机械传动概念目前,对液压机械传动这一技术用语,含义不统一,有必要加以明确。本文认为:在功率传递过程中,主要环节分为液压功率流和机械功率流两个分支,然后再进行汇合的这类传动,称为液压机械传动。如果在功率传递过程中,仅仅是先后分别为液压功率流和机械功率流或相反,则不能称作液压机械传动。众所周知,液压传动的显著优点是能实现无级调速,且调速范围比机械传动要大得多。而机械传动的主要优点是传动效率高,通常可以比液压传动高10～20％,但实现无级调速是困难的,即使实现较大的无级调速其结构复杂且效率降低。
Over the years, many papers have been published at home and abroad to improve the efficiency of hydraulic transmission. From the current progress of the situation, the hydraulic components of the research and improvement, although there are still some potential to dig, but in general, has gradually become the limit, so the hydraulic transmission in the field of transmission systems to continue to occupy a seat territory must Further improve economic efficiency. This article will conduct a preliminary discussion. First, the concept of hydraulic machinery transmission At present, the technical language of hydraulic machinery transmission, the meaning is not uniform, it is necessary to be clear. This paper argues that: in the process of power transmission, the main link is divided into hydraulic power flow and mechanical power flow of two branches, and then re-confluence of such transmission, known as hydraulic mechanical transmission. If the power transfer process, only one after another were the hydraulic power flow and mechanical power flow or vice versa, it can not be called hydromechanical transmission. As we all know, the significant advantage of hydraulic transmission is to achieve stepless speed regulation, and the speed range is much larger than mechanical transmission. The main advantage of mechanical transmission is the transmission efficiency is high, usually 10 to 20% higher than the hydraulic drive, but to achieve stepless speed regulation is difficult, even if the larger stepless speed regulation of its complex structure and lower efficiency.