Bearing Lubrication and Application - Rensselaer （轴承润滑和应用,伦斯勒理工学院）.pdf

Bearing Lubrication and Application Daniel R Snyder Director Application Engineering SKF Industrial Division Kulpsville, PA 2007-05-18 ©SKF Slide 2 [Code] SKF [Organisation] Bearing lubrication Basic tribological aspects • Lubricant film build-up • Hydrodynamic lubrication • Elasto-hydrodynamic lubrication • Starved lubrication 2007-05-18 ©SKF Slide 3 [Code] SKF [Organisation] What is Tribology? The science and technology of interacting surfaces in relative motion and of the practices related thereto. Word invented 1966 by Peter Jost, British Department of Education and Science Greek τριβοσ = tribos = to rub Keywords: Friction Lubrication Wear 2007-05-18 ©SKF Slide 4 [Code] SKF [Organisation] Tribology research and SKF Tribology research and Material research at SKF has been the basis for: • Current SKF surface topography specifications and machining practice • ISO rating life equations • SKF Life Theory • SKF General Catalog graphs for viscosity, μ , a , γ , etc. 1 SKF c • SKF friction factors and reference speed and limiting speed ratings • SKF surface treatment and coatings • SKF cage geometries and materials • Selection of greases for SKF sealed bearings 2007-05-18 ©SKF Slide 5 [Code] SKF [Organisation] Three major lubrication regimes: Full film lubrication •Complete separation of mating surfaces by the lubricant film Mixed lubrication • Incomplete separation of the mating surfaces by the lubricant film Boundary lubrication •Surfaces only separated by lubricant molecules attached to the surfaces 2007-05-18 ©SKF Slide 6 [Code] SKF [Organisation] Three major lubrication modes for full-film lubrication Hydrostatic lubrication: • Pressure film build-u