(一) 引言液力传动内燃机车必须具有良好的起动加速性能,才能满足列车不断起动和迅速加速的要求。尤其是调车机车,有着频繁的起动和较长时间的低速运行,更需要在起动和低速区有良好的性能。目前,我国液力传动内燃机车上所采用的单级起动变扭器有B8—Ⅲ、EQQ3、JQB2等型,进口机车上有单级的VoithL820rU—Ⅰ (A) Introduction Hydrodynamic diesel locomotives must have good starting acceleration, in order to meet the requirements of the train starting and accelerating rapidly. In particular, shunting locomotives, with frequent start-up and a long time low-speed operation, but also in the start-up and low-speed zone have good performance. At present, the single-stage starting torque converter used in the hydraulic transmission diesel locomotives in our country is of the type B8-Ⅲ, EQQ3, JQB2, etc. and the imported locomotive has a single stage of VoithL820rU-Ⅰ