一、引言 对拖拉机功率传递部件效率的分析表明,发动机是其中效率最低的,在部分负荷下尤其如此。作者建议扩大变速箱速度范围(带上增速传动),使拖拉机能在较低的发动机转速下工作。文中以一实例指出,在非稳定工况下,把发动机转速降低34％,可以 I. INTRODUCTION An analysis of the efficiency of tractor power transfer components shows that the engine is one of the least efficient, especially at part load. The authors suggest expanding the gearbox speed range (with a boost) to allow the tractor to work at lower engine speeds. An example is given in this paper. Under unstable conditions, the engine speed is reduced by 34%