Surface Texture And Journal Report

1382 WordsSep 7, 20166 Pages
CHAPTER 3 SURFACE TEXTURE AND JOURNAL BEARINGAPPARATUS Theoretical and experimental results show that the performance of a load-bearing surface in hydrodynamic lubrication may be enhanced by ‘engineering’ a definable surface texture onto the Inner Surface. These surface textures are in the form of protrusions (positive asperities) or cavities (negative asperities) of known size and geometry. The benefits of such surface textures include lower friction torque, higher load capacity and lower operating temperatures. The textured surface affects positively the cavitation’s zone by increasing the fully film fluid region. It helps in effective lubrication and thus it optimizes the bearing performance. In tribology, the four basic functions of texturing are: 1. To alter the flow and film thickness of lubricating fluids locally and across the contact region. 2. To serve as channels to supply lubricant to a surface. 3. To alter the bearing pressure distribution. 3.1 Surface Textures The texture of any surface is defined by the inherent surface topography it exhibits. All surfaces have a unique texture and structure and all manufactured surfaces are ‘Engineered’ [22]. Design engineers have an understanding of the relationship between surface texture and its function. Deterministic surface textures are those that have specific structured pattern and that are amenable to a sensible description. Such deterministic surface textures are deliberately manufactured in order to improve

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