Abstract
Axial piston pumps are very important to the hydraulic system on aircrafts, and their reliability plays critical role for ensuring the reliability and safety of aircrafts. The thickness prediction of the film between valve plate and cylinder block has received considerable concerns. This article presents a new dynamic seven-stage model for the thickness prediction of the film between valve plate and cylinder block in axial piston pumps. By dividing the rotation of the cylinder into seven stages, the complete analytical expression of the pressure distributions between valve plate and cylinder block is derived. The lubrication film forces and torques exerted on the cylinder block are then calculated and the film is determined by analyzing the complex dynamics of cylinder block. Experiments have been conducted and the results show that the proposed model is effective.
Highlights
Due to the large power-to-weight ratio and high efficiency, axial piston pumps are widely used in the hydraulic systems of aircrafts
It has been found that large percent of the failures of axial piston pumps are caused by the wear between valve plate and cylinder block.[1]
In order to validate the proposed model, we have considered a certain type of aircraft hydraulic piston pump, which was manufactured by Liyuan hydraulic corporation in Guiyang, Guizhou, China
Summary
Due to the large power-to-weight ratio and high efficiency, axial piston pumps are widely used in the hydraulic systems of aircrafts. Keywords Axial piston pump, seven stages of pump rotation, lubricating film thickness calculation, dynamics of cylinder block, experimental validation This article presents a dynamic seven-stage (DST) model for the thickness prediction of the film between the valve plate and cylinder block in the axial piston pumps.
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