Textured surfaces for improved lubrication at high pressure and low sliding speed of roller/piston in hydraulic motors

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An analytical approach for analysis and optimisation of slider bearings with infinite width parallel textures (2010, background): “The positive effect of artificial surface texturing on enhancing the load capacity, wear resistance and/or friction coefficient of mechanical seals [2], piston-ring/cylinder liner mechanism in internal combustion engines [3, 4, 5] and roller/piston in hydraulic motors [6] as some of the application ”
Applying Micro-Texture to Cast Iron Surfaces to Reduce the Friction Coefficient Under Lubricated Conditions (2007, background): “Pettersson et al. have also reported that textured surfaces such as groove patterns and mesh patterns exhibited less fluctuation than flat surfaces, but they had the same friction coefficients as flat surfaces [ 12 ].”
Orientation effects of micro-grooves on sliding surfaces (2011, background): “Beside the extreme cases of groove orientation, just like the cylinder liner, there are experimental results showing that the pattern of micro-grooves could be optimized further to obtain better tribological performance through the mesh design [31], and through the angle of cross-hatch and groove as”