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In addition, there are many research institutions abroad to carry out relevant research. At the micro level, the pressure field characteristics of the oil film between the plunger pairs of the University of Bath in the United Kingdom and the University of Shinjin in Japan, the friction characteristics in the plunger cavity of the University of Missouri Columbia in the United States, the leakage characteristics in the clearance between the slipper pairs, and the volume efficiency of the port pair were studied, Hydraulic motor of plate bending machine The pressure distribution and bearing capacity of the plunger cavity were measured and theoretically analyzed at Birmingham University.

Reducing vibration and noise is a key technology related to the future development of axial piston pump motor. With the progress of society, people have higher and higher requirements for the working environment. Noise is an important indicator to measure the quality of the working environment. High speed hydraulic motor The noise problem of hydraulic pump is also clearly stipulated in countries all over the world. In hydraulic transmission device, pump motor is the main noise source. Due to the discontinuity of the oil output from the cylinder and the separation structure of the oil suction and pressure chambers, the axial piston tilting motor produces large flow pulsation noise and hydraulic noise in the cylinder, as well as cavitation noise generated by complex flow channels. The overall noise of the axial piston pump is composed of hydraulic noise and mechanical noise.

This is a kind of vibration damping structure set on the pump motor housing by the German Yashen University of Technology. This structure can reduce the vibration of the plunger pump motor to a certain extent, so that its vibration frequency changes little, that is, considering the compressibility and leakage rate of the oil, so as to minimize the vibration of the plunger pump motor.