The basic principles of lubrication, friction and wear are examined for simple journal and rolling‐element bearings where it is recognized that bearing failures will ultimately occur as a result of surface damage and fatigue even in ideal circumstances.
The concept of Elasto‐Hydro‐Dynamics (EHD) as an operating region is described as a means of optimizing the bearing lubrication and thermal properties of a design. This leads logically to a recognition of the importance of lubricant viscosity and its effect on the lubrication efficiency.
The major attributes of both mineral and synthetic lubrication oils are described including viscosity, oxidation (coking) and foam‐ability.
The lubrication system typical of the modern gas turbine engine is described where high pressure oil is supplied to the main engine bearing sumps and accessory gearbox. The oil scavenged from the sumps is then cooled and de‐aerated before being re‐pressurized and filtered prior to returning to the engine bearings.
System design considerations are discussed including monitoring of key parameters such as temperature pressure and filter delta‐P.
Oil debris capture via chip detectors is described together with the more advanced inductive debris monitoring technology which can detect both ferrous and non‐ferrous particles in the oil and distinguish between particle sizes.
Finally comments on the challenges of ceramic bearing technology are presented.
Lubrication Systems
2011-07-22
19 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Lubrication systems for automobiles
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Simulation of Lubrication Systems
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