Elastohydrodynamic film thickness and flash temperature
Rolling element bearings, cams and gears generate load-supporting oil films in accordance with elastohydrodynamic theory. These devices operate with oil films on the order of micrometers in thickness. If the operating conditions are incorrect, the film becomes so thin that the bearing surfaces experience metallic contact resulting in severe surface distress or untimely failure. EHD theory usually assumes that isothermal conditions prevail. For low speeds and typical oil viscosity this assumption gives good results, but as these parameters are increased isothermal calculations can give significant errors. A thermal correction factor discovered in recent years can be applied to the isothermal equations to give good results over a greater range of operation. Film thickness correction factors considering the roughness of the surfaces and the effect of lubricant starvation are discussed. Flash temperature rise in the bearing conjunction due to sliding is briefly considered.
- Research Organization:
- Univ. of Virginia, Charlottesville
- OSTI ID:
- 7322063
- Journal Information:
- Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Vol. 21:3; Conference: National meeting of the American Chemical Society, New York, NY, USA, 4 Apr 1976; Other Information: See CONF-760458--P3; CONF-760826--P5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BEARINGS
FATIGUE
ROUGHNESS
GEARS
LUBRICANTS
COMBUSTION PROPERTIES
OXIDATION
SHEAR PROPERTIES
VISCOSITY
ADDITIVES
DETERGENTS
FILMS
GREASES
POUR POINT
PRESSURE DEPENDENCE
STABILITY
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THICKNESS
CHEMICAL REACTIONS
DIMENSIONS
EMULSIFIERS
MECHANICAL PROPERTIES
PHYSICAL PROPERTIES
SURFACE PROPERTIES
SURFACTANTS
THERMODYNAMIC PROPERTIES
WETTING AGENTS
020500* - Petroleum- Products & By-Products
400201 - Chemical & Physicochemical Properties