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现在各种车辆和设备都在不同程度上采用了静压传动,但由于液压泵和液压马达本身效率较低,限制了静压传动更广泛的应用。为此,六十年代前后,国外提出采用双功率流液压机械传动的方案。其传动性能大体如图1所示,在相当宽的转速范围内效率超过85%,效率较液力传动高,尤其在高速范围内更为突出。此外,当用于车辆驱动时,液压机械传动的扭矩比可以单独地进行控制,可使发动机处于最佳工作状态,提高燃油的利用率。由于液压元件的反传性能比变矩器好得多,利用这种反传性能可以回收车辆制动时消耗的能量,对于大型车辆可以获得很大的节能效果。鉴于以上各点,国外正在竞相研制应用双功率流液压机械传动的
Nowadays, all kinds of vehicles and equipments have adopted hydrostatic transmission to different extents. However, due to the low efficiency of the hydraulic pump and the hydraulic motor itself, the application of the hydrostatic transmission is limited. For this reason, before and after the 1960s, the proposal of adopting dual-power flow hydraulic mechanical transmission was proposed abroad. Its transmission performance generally shown in Figure 1, in a very wide range of speed over 85% efficiency, high efficiency hydraulic transmission, especially in the high-speed range is more prominent. In addition, when used in a vehicle drive, the torque ratio of the hydromechanical transmission can be controlled individually, allowing the engine to work optimally and increasing fuel efficiency. Due to the anti-transmission performance of the hydraulic components is much better than the torque converter, the reverse energy can be used to recover the energy consumed when braking the vehicle, which can achieve great energy saving effect for large vehicles. In view of the above points, foreign countries are competing to develop dual-power flow hydraulic mechanical transmission