液压机械传动的基本元件是行星轮系与轴向柱塞式液压泵-马达。它比起纯液压传动来具有较高的效率,在传递同样功率时重量和尺寸均较小。应用于车辆上时,与液力传动相比其“力矩比”可以独立控制,能有效地改善与原动机特性的匹配,并使车辆具有较高的燃油经济性。本文就液压机械传动的基本原理、典型结构、评价指标介绍如 The basic components of hydromechanical transmission are planetary gear train and axial piston pump - motor. It is more efficient than a pure hydraulic drive and has the same weight and size when delivering the same power. When applied to vehicles, compared with hydraulic transmission, the “torque ratio” can be controlled independently, which can effectively improve the matching with the characteristics of the prime mover and make the vehicle have higher fuel economy. This paper on the basic principles of hydraulic machinery transmission, typical structure, evaluation index introduction