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On this basis, Germany's Yashen University of Technology has established an experimental platform for friction pairs based on the idea of model pump and carried out relevant research. Power head hydraulic motor The test method using the model motor is close to the reality, and the results can more truly describe the actual working condition of the motor, which is of great significance to the research of the motor and the design optimization of the new structure.

During the development of the axial piston motor, the three friction pairs, namely, the plunger pair, the port pair, and the contact pair between the plunger and the swashplate (mainly the slipper structure at present), have not changed much. In the process of completing the work of oil absorption, pressure oil and port type engines, they are the most important links and places where energy dissipation, leakage and flow pulsation occur. The performance and life of these friction pairs are closely related to the engine. Therefore, Crushing motor The modification and optimization of friction pairs have also become one of the key technologies of axial piston engines. By studying the oil film dynamics, friction and energy dissipation at the clearance of the plunger pair, professors MONIKA of Purdue University in the United States revealed the distribution law of the friction force on the plunger with different shapes, concluded that the cylindrical plunger is not the plunger shape under the friction state, and proposed that the plunger has more complex micro movements in the plunger cavity, The fretting model of the plunger wrist force state solved by the formula is also verified by the corresponding experiments.