Abstract
This paper discovers how the surface texture of micro-dimples impacts the tribological performance of the interface between cylinder block and valve plate. For this, a mathematical model which considers the cavitation effect for calculating oil film pressure and oil leakage is established. The radius of the micro dimples is considered for studying the influence of the pressure field and the leakage flow. Then a simulation model is built up according to the mathematical model. Meanwhile, a particular test rig was designed and established to verify the theoretical results. Both simulation and experimental results show that a good designed surface texture of micro-dimples could improve the lubrication performance a lot and the structure parameters could be optimized. The leakage flow of the port plate pair will be greatly decreased by micro dimples and it is positive correlated with the radius of the micro dimples.
Highlights
The swash-plate axial piston pump is in wide spread use because of its simple structure and compact design
The above studies have shown that the surface texture technology affects the performance of components, but little about the axial piston pump
This paper aims to investigate the influence of the physical parameters on lubrication performance of cylinder block-valve plate interface
Summary
The swash-plate axial piston pump is in wide spread use because of its simple structure and compact design. Rahmani et al (2010) studied the influence of surface texture on lubrication performance between piston and cylinder block They found that surface texture can improve the lubrication performance. Xuan Ma et al (2018) put forwarded two optimal surface texture designs and found that surface texture designs can reduce friction Their researches are aimed at the lubrication performance of piston-cylinder block interfaces, without considering cylinder block-valve plate interfaces. Zhu et al (2015) studied the influence of surface topography on the low-speed tribological performance of port plates in axial piston pumps and found that different grinding treatments on the valve plate can produce different friction coefficients. WU Shao-feng et al (2017) studied the influence of hemispherical pits on lubrication performance of port plate pair They found that non-smooth surface can produce dynamic pressure effect, which can improve the lubrication performance of the valve plate. The optimized radius of micro dimples which can greatly reduce the leakage flow will be obtained by the numerical calculation and the experimental tests
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