Based on actual working conditions and parameters of the hydraulic steering gear, the purpose is optimizing the rubber seal of steering gear by different rubbers mixing technology. Compare the five kinds of rubber with metal of the friction characteristics in dynamic fit, it can obtain a performance excellent rubber real in the specific operation conditions. And then improve the overall service life of the steering gear. It is first prepared the same hardness TPU and PVC and blends that the ratio is 3:7, 5:5and7:3 in this article. The pros and cons of the five rubbers are analyzed in friction and wear properties of the above experimental. The test curve of coefficient friction and wear with time has been done under different load at constant low speed. It determines TPU/PVC = 3:7 blends through friction and wear and wear mechanism of five rubbers with steel comparatively analyses, and the heat resistance and wear resistance of them are better than the other TPU/PVC blends and PVC under oil lubrication conditions.

Based on actual working conditions and parameters of the rudder system, the purpose is optimizing the connection of rudder system by keyless coupling technology. Analysis on the keyless coupling of rudder system is done by the finite element method under impact loads in different directions. It can improve the performance of keyless coupling in the specific operation conditions of rudder system to be excellent. According to the test requirements of the torque and impact, the results of the completion of the finite element analysis are verified by establishing the experimental platform of keyless coupling. Experiments and analysis of the results show that the preload is formed by the hydraulic nut in the keyless coupling and the static frictions is formed between the rudder and tiller. In the meantime, it is formed between rudder and the rudder blade which can make the working state of the rudder system stable under the required torque and impact loads.