Abstract
The sealing performance of a hydraulic cylinder depends on the characteristics of three essential elements: the rod, the seal and the fluid. To predict the behaviour of a hydraulic seal, including the friction force and leakage rate, a series of theoretical and experimental studies have been carried out. In this article, a one-dimensional elasto-hydrodynamic model of the U-cup hydraulic rod seal is developed taking into account: the roughness of the shaft and lips. The numerical results are validated by experiments previously published.
Highlights
The hydraulic U-rod seal is the most frequently used machine component to prevent leakages with minimal wear effect
Inverse hydrodynamic lubrication (IHL): Based on the assumption that the hydrodynamic pressure is equal to the static pressure calculated on structural computational software (FEM), the Reynolds equation is solved by taking the film thickness as the unknown parameter, as carefully detailed in Crudu thesis [4]
Elastohydrodynamic lubrication (EHL): Elgadari et al [3] have recently used this approach by solving the Reynolds equation and taking into account the elasticity of the seal, and the roughness of the lip and the shaft
Summary
The hydraulic U-rod seal is the most frequently used machine component to prevent leakages with minimal wear effect. Lawrie and O'Donoghue [1] have proved experimentally the presence of a thin film throughout the lubricated contact. They demonstrated that in the outstroke rod motion, the film is thicker and the shape of the lip has a significant effect on the U-cup hydraulic rod seal performances. Elastohydrodynamic lubrication (EHL): Elgadari et al [3] have recently used this approach by solving the Reynolds equation and taking into account the elasticity of the seal, and the roughness of the lip and the shaft. The objective of this work is to perform a parametric study by considering a one-dimensional elastohydrodynamic model that takes into account the elasticity of the lip and the roughness of the shaft.
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