Synergy of surface textures on a hydraulic cylinder piston

Abstract

This paper explores the synergy mechanisms that are associated with the coexistence of multiple textures, to improve the precision control of a hydraulic servo cylinder. Based on the classical Reynolds equation, it establishes a single-texture and a nine-texture model to compare and study the synergy of surface textures. The film thickness is obtained under different working conditions for 1 N. Based on this parameter, it compares the simulation results from the two models with the experimental results to determine if the friction coefficient is reduced when multiple textures exist. When multiple textures exist, the inlet pressures of the central texture increase, but the peak pressure and cavitation pressure decrease. The synergy of the textures acts as an 'average pressure' and causes the pressure to decrease, which directly decreases the shear force. As the area ratio of the texture increases, the beneficial effect from the synergy gradually increases and then decreases, which implies that there is an optimum area ratio. The depth of the texture was 10 μm and the optimum depth-to-diameter ratio was 0.009. When the speed increases for a light load, the oil film thickness increases. However, this phenomenon does not substantially change the synergistic effect.

Optimizing the Formation of Hydraulic Cylinder Surfaces, Taking into Account Their Microrelief Topography Analyzed during Different Operations

“…This resulted in a lubricating film of a given size formed on the working surface of the "rod-hydrocylinder liner" tribopair. This recommendation is consistent with the research findings presented in [32].…”

“…Moreover, the surface quality parameters, such as roughness, accuracy, physical, and mechanical parameters were high enough, and their values met the technical requirements for the working surfaces of hydrocylinder liners. However, these parameters were not optimal for the "metal-rubber" coupling that performs relative movements [29][30][31][32][33][34][35].…”

“…Thus, the research showed that, apart from reducing the mean value of the su roughness parameter Ra (Figure 8), the technological operation of semi-finish turning nificantly worsened the accuracy parameter-the deviation from roundness. High v of deviation from roundness were not eliminated by the technological operation of fi ing [32,33]. Additionally, these modes of processing formed an inhomogeneous su structure.…”

Effect of Texture on Total Energy Consumption of High Frequency Hydraulic Impact Piston Pair

“…It has also been shown by many scholars that different morphology and parameters of texture have a significant influence on surface friction loss. Hui Zhang et al [20] studied the friction force of surface texture parallel sliders with different morphologies and found that the hydrodynamic lubrication performance of circular textures is better with lower friction. Daniel Gropper et al [21] analyzed the performance of bearing with variation of texture area and textured depth on a surface and found that the optimum texture depth should be slightly less than the minimum film thickness of an unreformed bearing and that an optimum texture depth and density with low friction existed.…”

Experimental Research of Partial Regular Microreliefs Formed on Rotary Body Face Surfaces

“…In Zhang et al (2019), research findings are presented, which indicate that a microrelief microstructure formed on the inner cylindrical surface of the cylinder liner, contributes to the ability of this surface to retain the oil film. This property of the working surface of the cylinder liner improves the operational properties of the surface and extends the cylinder life, as a whole.…”