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A series of theoretical analysis and experimental research has been carried out on the 323 counterrotating reactor torque converter, from which the cause of low stall torque ratio and maximum efficiency is found, and the relevant improvement measures have been adopted. The experimental results of the improved torque converter show that the stall torque ratio is increased from 4.31 to 5.2, and the maximum efficiency from 81.6% to 82.3%, with the other performance parameters a little better or unchanged.

In this paper, a quasi-three-dimensional design method of torque converter blade is presented, and a turbine example is designed. In addition, a new way that three-dimensional flow field calculation is added into traditional blade design is given and the judge rule of flow field is presented. The blade system of a Chinese made YB 300 torque converter has been redesigned with the aid of the new way, and its performance has been improved. The experiment shows that the maximum efficiency has been raised from original 84. 7% to 86%, with other factors such as stall torque ratio and so on unchanged or a little better.

A SRM* type torque converter and power shift gear box were designed and trial-produced for Chinese city bus, considering the cost of manufacture as the first factor. The SRM type torque converter used in this transmission was independently developed and tested in China with very good results. The combination of SRM torque converter with lock-up clutch and two forward speeds including one overdrive speed has made the Chinese city bus perform better in fuel economy, gradeability, ease of handling and in start quality than the conventional mechanical gear box.