Abstract
The friction in the swash plate type axial piston pumps is mainly influenced by the fluid film in the friction interface. The piston–cylinder interface is one of the key friction interfaces in the pumps. The film geometry is determined by the gap between the piston and the cylinder. The dimensions of the parts determine the gap geometry, and the deformation of the structure also influences the gap geometry. The fluid viscosity is strongly influenced by temperature. Thus, a novel approach of studying the fluid film, the structure, and temperature interaction is provided in this paper. A full and quick fluid–structure–thermal interaction simulation is realized. Then, a dynamic model of the piston–cylinder interface, which integrated the fluid–structure–thermal interacting effects, has been developed. Finally, an approach for calculating the extra friction force between the piston and the cylinder is provided. Compared with the measurement data, the simulation results of the axial friction force achieve a good fit. The present work allows a fast prediction and detailed support for designing the piston–cylinder interfaces.
Highlights
Swash plate type axial piston pumps are prevalent in fluid power systems due to its high pressure, high volumetric efficiency, and compact structure [1]
High pressure and high sliding velocity are usually exerted for the piston–cylinder interface
The numerical tool COMSOL is introduced to calculate the elastic deformation of the structure
Summary
Swash plate type axial piston pumps are prevalent in fluid power systems due to its high pressure, high volumetric efficiency, and compact structure [1]. There are three key friction interfaces in the axial piston pump: the slipper–swash plate interface, piston– cylinder interface, and valve plate–cylinder interface. The fluid film in the gap between the piston and the cylinder greatly influences the lubrication performance. It is desirable to develop a model which can realize the fluid–structure–thermal interaction simulation to study the influence of various factors on friction. Based on this model, the friction force can be predicted, and the design of the gap geometry can be optimized
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