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液压传动系统正在向集成化和机电一体化的方向发展。在七十年代初期发展了由通轴式油泵、油马达组成的静液压传动(无级变速)装置,解决了闭式油路液压传动系统的集成化问题;七十年代中期出现了二通插装式液压阀,解决了大、中型通径液压阀的集成化问题。八十年代,开始发展机电一体化的油泵电机组是为了解决油泵和电机之间的集成化问题。这样,液压系统的集成化问题就得到较全面的发展,即:闭式油路系统的集成化和开式油路系统的集成化,油泵的集成化和液压阀的集成化都得到较为全面的解决。
Hydraulic transmission systems are moving toward integration and mechatronics. In the early 1970s, a hydrostatic transmission (continuously variable) device consisting of a through-shaft type oil pump and an oil motor was developed to solve the problem of the integration of closed hydraulic circuit hydraulic transmission systems; two-way plugs appeared in the mid-1970s. Installed hydraulic valves solve the problem of integration of large and medium-sized hydraulic valves. In the 1980s, the development of mechatronic oil pump motor units was initiated to solve the problem of integration between oil pumps and motors. In this way, the integration of the hydraulic system has been more fully developed, namely, the integration of the closed oil system and the integration of the open oil system, the integration of the oil pump and the integration of the hydraulic valves have been relatively comprehensive. solve.